# Patent

## Title
Mobile terminal, base station and methods therein

## Abstract

Embodiments herein relate to a method in a mobile terminal (10) for requesting access to a wireless communication system. The mobile terminal (10) receives broadcasted system information that indicates a first available resource of a contention based channel. The mobile terminal (10) derives a second available resource of the contention based channel based on the first available resource of the contention based channel. The mobile terminal (10) further transmits an access request preamble mapped to the second available resource to access the wireless communication system.

## Background
TECHNICAL FIELD
Embodiments herein relate to a mobile terminal, a base station and methods therein. In particular, embodiments herein relate to request access to a wireless communication system.
BACKGROUND
In today's wireless communication systems a number of different technologies are used, such as Long Term Evolution (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/Enhanced Data rate for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access (WiMax), or Ultra Mobile Broadband (UMB), just to mention a few possible implementations. A wireless communication system comprises base stations providing radio coverage over at least one respective geographical area forming a cell. The cell definition may also incorporate frequency bands used for transmissions, which means that two different cells may cover the same geographical area but using different frequency bands. Mobile terminals are served in the cells by the respective base station and are communicating with respective base station. The mobile terminals transmit data over an air or radio interface to the base stations in uplink (UL) transmissions and the base stations transmit data over an air or radio interface to the mobile terminals in downlink (DL) transmissions.
Release 6 of the third generation partnership project (3GPP) standards introduced Enhanced Uplink (E-UL), also known as High Speed Uplink Packet Access (HSUPA). Compared to previous releases E-UL improved performance of uplink communications—those from a mobile terminal, i.e., User Equipment, UE, to a base station—using higher data rates, reduced latency, and improved system capacity. These enhancements were implemented through a new transport channel called the Enhanced Dedicated Channel (E-DCH). In Release 6, and continuing into Release 7, however, a mobile terminal may only use the E-DCH in limited circumstances.
Specifically, at the Radio Resource Control (RRC) level, a mobile terminal may be in two basic operation modes, called IDLE mode and CONNECTED mode. In IDLE mode, the mobile terminal requests an RRC connection before sending any uplink data or responding to a page. In CONNECTED mode, by contrast the mobile terminal has an RRC connection, and may be in one of several service states: Universal Mobile Telecommunications System (UMTS) Radio Access Paging Channel (URA_PCH) state, a Cell Paging Channel (CELL_PCH) state, a Cell Forward Access Channel (CELL_FACH) state, and Cell Dedicated Channel (CELL_DCH) state. The URA_PCH and CELL_PCH states are paging states in which the mobile terminal sleeps and only occasionally wakes up to check for a page. To send uplink data, the mobile terminal moves to the CELL_FACH or CELL_DCH state. When moved to the CELL_FACH state in Releases 6 and 7, the mobile terminal may send a relatively small amount of uplink data over a contention-based transport channel called the Random Access Channel (RACH), but not over the E-DCH; to send data over the E-DCH, the mobile terminal had to be moved to the CELL_DCH state, which introduces a delay.
To reduce the delay caused by the state transition, Release 8 of the 3GPP standards allocates a portion of E-DCH resources as common resources, also called common E-DCH resources, that may be used on a contention-basis by mobile terminals in the CELL_FACH state. Accordingly, mobile terminals in the CELL_FACH state with a relatively large amount of uplink data may send that data over the E-DCH using the common E-DCH resources rather than having to make multiple accesses over the RACH or switch to the CELL_DCH state.
This however comes at a cost of increased downlink control signaling. Indeed, the base station now broadcasts system information to mobile terminals that informs them about which access request preambles may be used for requesting E-DCH access, and which E-DCH resources are available as common E-DCH resources. Among other disadvantages, this increased DL control signaling may delay the base station's signaling of more crucial system information.
For example, a base station often broadcasts system information in a series of so-called System Information Blocks (SIBs). Different types of system information are broadcasted in different types of SIBs, one after another in a time division manner. This process is repeated to continually provide system information to mobile terminals on an as-needed basis. Accordingly, any given large SIB delays broadcast of the entire series of SIBs, which in turn increases the time between which any given SIB is repeated, i.e., the SIB's repetition factor. If the SIB's repetition factor is excessively large for an SIB with crucial system information, there may be long periods of time in which a mobile terminal cannot be paged, send uplink data, perform a cell update, or perform a fallback to a circuit-switched network, also called CS fallback. This type of delays may be caused by the increased DL control signaling associated with Release 8 of the 3GPP standards resulting in a reduced performance of the wireless communication system.
SUMMARY
An object of embodiments herein is to enhance the performance of the wireless communication system.
According to an aspect of embodiments herein the object is achieved by a method in a mobile terminal for requesting access to a wireless communication system. The mobile terminal receives broadcasted system information that indicates a first available resource of a contention based channel. The mobile terminal derives a second available resource of the contention based channel based on the first available resource of the contention based channel. The mobile terminal further transmits an access request preamble mapped to the second available resource to access the wireless communication system.
According to another aspect of embodiments herein the object is achieved by a method in a base station for managing access to a wireless communications network. The base station encodes system information indicating the second available resource of the contention based channel relative to the first available resource of the contention based channel. The base station broadcasts the encoded system information.
According to yet another aspect of embodiments herein the object is achieved by a mobile terminal for requesting access to a wireless communication system. The mobile terminal comprises a receiver circuit configured to receive broadcasted system information that indicates a first available resource of a contention based channel. The mobile terminal further comprises a processing circuit configured to derive a second available resource of the contention based channel based on the first available resource of the contention based channel, and to transmit an access request preamble mapped to the second available resource.
According to still another aspect of embodiments herein the object is achieved by a base station for managing access to a wireless communications network. The base station comprises a processing circuit configured to encode system information indicating a second available resource of a contention based channel relative to a first available resource of the contention based channel. Furthermore, the base station comprises a transmitter circuit configured to broadcast the system information.
By indicating available resources of the contention based channel relative to other available resources of that channel, the amount of data signalled in the system information is reduced. Thus, the delay for transmitting system information is reduced and the performance of the wireless communication system is improved.



BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments will now be described in more detail in relation to the enclosed drawings, in which:
FIG. 1 is a schematic block diagram depicting a wireless communication system,
FIG. 2 is a combined flowchart and signalling scheme depicting embodiments herein,
FIG. 3 is a schematic flowchart depicting embodiments of a method in a base station,
FIG. 4 is a block diagram depicting embodiments of a base station,
FIG. 5 is a schematic flowchart depicting embodiments of a method in a mobile terminal, and
FIG. 6 is a block diagram depicting embodiments of a mobile terminal.



DETAILED DESCRIPTION
FIG. 1 is a schematic overview depicting a wireless communication system, also referred to as a radio communications network. In today's wireless communication systems a number of different technologies are used, such as LTE, LTE-Advanced, WCDMA, GSM/EDGE, WiMax, or UMB, just to mention a few possible implementations. The wireless communication system, which includes a base station 12 and one or more other entities 14. The base station 12 provides an uplink communications channel 16 for receiving uplink data from individual mobile terminals 10, 10-1, 10-2 . . . 10-N in a group 20 of N mobile terminals, also conveniently referred to as “users” or “user equipments”. The base station 12 further provides a downlink communications channel 22 for sending transmissions to mobile terminals 10-10-N in the group 20, including control signaling.
It should be understood by the skilled in the art that “mobile terminal” is a non-limiting term which means any user equipment, wireless terminal, device or node e.g. Personal Digital Assistant (PDA), laptop, mobile, sensor, relay, mobile tablets or even a small base station communicating within a cell served by the base station 12.
The base station 12 may also be referred to as e.g. a NodeB, an evolved Node B (eNB, eNode B), a radio base station, a base transceiver station, Access Point Base Station, base station router, a base station controller, a radio network controller, or any other network unit capable to communicate with the mobile terminals 10-10-N within the cell served by the base station 12 depending e.g. of the radio access technology and terminology used.
The base station 12 may support two different Contention-Based (CB) channels of the uplink communications channel 16, one legacy CB channel, e.g., offering low data rates such as a RACH, and one non-legacy CB channel, e.g., offering 5 high data rates such as a E-DCH. Some mobile terminals 10-1-10-N, referred to as legacy mobile terminals, only support the legacy CB channel, while others support both CB channels. If the mobile terminal 10 supports both channels, the mobile terminal 10 may preferentially select the non-legacy CB channel for sending uplink data. In order to manage access to both CB channels, the base station 12 broadcasts system information for both CB channels on a control channel of the downlink communications channel 22. Contention based channel means herein a channel that many mobile terminals may use without pre-coordination. Thus, for a contention based channel the base station 12 broadcasts access request preambles that the mobile terminal 10 randomly selects. In a non-contention based channel the base station 12 first maps an access request preamble to the mobile terminal 10 and then transmits the mapped access request preamble to the mobile terminal 10 for the mobile terminal 10 to use. The base station 12 broadcasts system information that indicates which resources of the CB channels that are available. As a point of advantage, the base station 12 intelligently broadcasts system information for the CB channels, in order to limit the amount of downlink control signaling. According to embodiments herein, instead of broadcasting system information to mobile terminals 10-10-N that independently indicates available resources, the base station 12 encodes system information that indicates available resources of a CB channel relative to other available resources of that channel, e.g., relative to a position in which other available resources are indicated in the system information. In some embodiments, for example, the available resources are indicated in an ordered list, and the base station 12 indicates available resources as a function of their position in the list relative to other resources. The base station 12 broadcasts this system information to the mobile terminals 10-10-N.
Correspondingly, the mobile terminal 10 is configured to receive system information that indicates a first available resource of a CB channel. The mobile terminal 10 is configured to then derive information for a second available resource of the CB channel based on or as a function of the first available resource. This may entail, for instance, deriving information for the second available resource according to a pre-determined rule that defines the second resource as a function of the first available resource, e.g., as a function of the first available resource's position within an ordered list describing the resources. In various embodiments, the second available resource of the CB channel is mapped to an access request preamble randomly selected by the mobile terminal. In such embodiments, the mobile terminal 10 is configured to derive information for the second available resource responsive to receiving a positive acknowledgement corresponding to the selected preamble, and to then transmit uplink data on the CB channel using the second available resource. Embodiments described herein may advantageously reduce the signaling required in System information Blocks (SIB), especially a System Information Block type 5 (SIB5) as the preambles information is signaled therein, to broadcast the total amount of common E-DCH resources around 70% compared with the current signaling.
FIG. 2 is a schematic combined flowchart and signaling scheme depicting some embodiments herein.
Step 201.
The base station 12 encodes the system information to be broadcasted to mobile terminals within an area covered by the base station 12. The system information indicates available resources of the contention based channel, e.g. the second contention based channel. The contention based channel may be represented by a Random Access Channel (RACH) or an Enhanced Dedicated Channel (E-DCH). The encoded system information indicates available resources of the contention based uplink channel relative to other available resources of that contention based channel.
Step 202.
The base station 12 broadcasts the system information to one or more mobile terminals 10-10-N.
The base station 12 may further broadcast over the control channel system information that indicates which first access request preambles and second access request preambles may be used for requesting access using respective ones of the CB channels. Each access request preamble may be mapped to a particular resource of a CB channel. In this regard, the CB channels share the access request preamble “space.”
As a point of advantage, the base station 12 may intelligently broadcast system information for the CB channels, in order to limit the amount of downlink control signaling. Instead of broadcasting system information to mobile terminals 10-10-N that independently indicates access request preambles for respective ones of the CB channels, the base station 12 may broadcast system information indirectly indicating the access request preambles for one channel, e.g., the non-legacy CB channel, based on, e.g. as a function of the access request preambles for the other channel, e.g., the legacy CB channel. Indirectly herein means that the second access request preambles are derivable from the first access request preambles, e.g. as a function of the indicated first access request preambles. Correspondingly, the mobile terminal 10 may receive system information directly indicating the access request preambles for one channel, e.g., the legacy CB channel, and may derive the access request preambles for the other channel, e.g., the non-legacy CB channel, as a function of the directly indicated access request preambles. The mobile terminal 10 may then randomly select one of the derived access request preambles and transmits the selected access request preamble to the base station 12, in order to request access to the associated CB channel, that is, the non-legacy channel or the legacy channel.
Step 203.
The mobile terminal 10 that has received the broadcasted system information indicating a first available resource, derives a second available resource from the system information as well as access request preambles of the CB channels. This may be the case when the first available resource generated a not acknowledged access request.
Step 204.
At some point after receiving this system information, the mobile terminal 10 requests access to a supported, or preferred, one of the CB channels, the first or the second contention based channel, e.g. by randomly selecting one of the first or second access request preambles associated with that channel, and by transmitting the selected preamble to the base station 12 with the second available resource.
Step 205.
The base station 12 that has received the transmitted access request preamble, performs contention management for the associated CB channel.
Step 206.
The base station 12 transmits or signals on the downlink communications channel 22 whether or not the base station 12 acknowledges or denies the mobile terminal's request for access to that channel using the second available resource.
Step 207.
If the mobile terminal 10 receives a positive acknowledgement, the mobile terminal 10 proceeds by sending uplink data on whichever available resource, e.g the second resource as exemplified, of the associated CB channel that is mapped to the selected and acknowledged access request preamble.
Embodiments described herein advantageously reduce the signaling required in SIB5 to broadcast the total amount of common E-DCH resources around 70% compared with the current signaling. In particular, after Rel-8, SIB5 may be substantially enlarged due to the common E-DCH configurations. A total of 32 common E-DCH resources may be configured in a cell. If all these resources are included in SIB5, the size of SIB5 would be increased by 8 segments, where a segment consists of a header and a data field, e.g. the data field carries the encoded system information elements. This would mean that SIB5 may take more than 12 segments, and would in turn mean that the Master Information Block takes up to 16 segments, SIB11 takes up to 16 segments, and SIB5 would take more than 50% of the 64 segments available in a 1.280 second scheduling window frame. As a consequence, SIB5 will not be able to be broadcasted in less than 5 640 ms, meaning that the repetition factor may need to be augmented. However, according to embodiments above, the number of segments to broadcast SIB5 may be reduced to less than 3 segments. This means that the repetition factor of the SIB5 may be reduced. Hence, the delay to transmit the URA/CELL updates Radio Bearer (RB) reconfiguration when it applies, or the delay introduced in the CS fallback mechanism will be minimized. In more detail, SIBs are read by the mobile terminal 10 in different stages. For example, when the mobile terminal 10 is switched on, or when the mobile terminal 10 moves from CELL_DCH state to CELL_FACH state, the mobile terminal 10 needs to acquire the SIBs again. Similarly, when the mobile terminal 10 moves to another cell, the new SIBs have to be read.
Cell update will be the most impacted procedure. Cell update is done when moving from CELL_DCH state to CELL_FACH state if the IDs are not included or the mobile terminal 10 selects a different cell than the one indicated in the RB reconfiguration. Cell Update is also performed when the mobile terminal 10 changes the cell. For E-DCH in mobile terminals in CELL_FACH state and CELL_DCH state, the Cell Update is also required after a Radio Link (RL) failure. There are other cases in which a cell update is required.
Furthermore, in Release 10 of the 3GPP standards also known as 4th Generation, CS fallback from LTE was introduced. This feature may require the mobile terminal 10 to read the SIBs before starting the procedure.
Those skilled in the art will appreciate that while the above examples have been described in the context of 3GPP standards, these teachings are applicable to a wide range of system types, communication channelization schemes, etc.
FIG. 3 is a schematic flowchart depicting a method in the base station 12 for managing access to a wireless communications network according to embodiments herein.
Step 301.
The base station 12 encodes system information indicating the second available resource of the contention based channel relative to the first available resource of the contention based channel. The contention based channel may in some embodiments correspond to a random access channel, RACH, or a common Enhanced Dedicated Channel, E-DCH. The system information may be comprised in a System Information Block type 5, SIB5. Additionally, the second available resource may be indicated in an ordered list of resources as a function of a position of the first available resource in the ordered list. The ordered list is in some embodiments defining common Enhanced-Dedicated Channel, E-DCH, resources. Each E-DCH Resource is defined by an Soffset information element, a Fractional Dedicated Physical Control Channel, F-DPCH, code number information element, and an E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel, E-HICH, info for common E-DCH information element. The position of the second available resource in the ordered list is in some embodiments defined by a default value in the Soffset information element. The default value may e.g. be a function of the position of the second available resource within the ordered list, a function of a “Soffset” value of a previous first available resource, or a function of the position of the second available resource and an offset value. The offset value is in these embodiments an Soffset value of the first available resource. The F-DPCH code number information element is in some embodiments the same for a maximum of ten common E-DCH resources. The E-HICH info for common E-DCH information element may be defined by a channelization code and a signature sequence. A default value of the signature sequence may be e.g. a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource. A channelization code of the second available resource is in some embodiments equal to a channelization code of the first available resource.
The second available resource may be defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel. The value may e.g. be a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource, or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.
Step 302.
The base station 12 broadcasts the encoded system information. Thus, the base station 12 manages access by broadcasting system information indicating available resource to be used to access the wireless communication system.
Embodiments herein advantageously reduce downlink control signaling associated with contention-based uplink access to a wireless communication system.
Embodiments herein further reduce downlink control signalling in that, instead of broadcasting system information to mobile terminals that independently indicates access request preambles for each of two different contention-based (CB) uplink channels, the base station 12 according to some embodiments may broadcast system information that indirectly indicates the access request preambles for one channel based on or as a function of the preambles for the other channel. Correspondingly, the mobile terminal 10 receives system information that directly indicates the access request preambles for one CB channel and derives the access request preambles for the other CB channel as a function of the directly indicated preambles.
As a specific example in the context of 3GPP specifications, the base station 12 may support CB channels that correspond to the Random Access Channel (RACH) and the common Enhanced Dedicated Channel (E-DCH). Accordingly, the base station 12 broadcasts system information for these channels in a System Information Block (SIB), namely SIB Type 5. System information for the RACH is broadcast in SIB5 using the Information Element (IE) “PRACH System Information List,” while system information for the common E-DCH is broadcast in SIB5 using the IE “Common E-DCH System Information.” An access request preamble as used above corresponds to a PRACH preamble, which is characterized by a signature sequence, a scrambling code, and a sub-channel.
In more detail, embodiments herein reduce the number of segments used in SIB5 to broadcast the IE “Common E-DCH System Info” which defines the common E-DCH resource parameters. For this purpose, a new coding is proposed for the IEs included in the IE “Common E-DCH System Info” within SIB5. The IE “Common E-DCH System Info” is an optional IE included in SIB5. The table below presents the current encoding for Frequency Duplex Division (FDD) for the IE “Common E-DCH System Info”. For definitions of the different IEs reference is made to a 3GPP Technical Specification (TS) 25.331 section 10 version 10.0.0.















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







UL interference for common E-
OP

UL

REL-8


DCH


interference







10.3.6.87




Common E-DCH MAC-d flows
MP

Common E-

REL-8





DCH MAC-d







flows







10.3.5.3b




CHOICE mode
MP



REL-8


>FDD




REL-8


>>PRACH preamble control
MP

PRACH
Control parameters of
REL-8


parameters (for Enhanced


preamble
the physical signal.



Uplink)


control







parameters







(for







Enhanced







Uplink)







10.3.6.54a




>>Initial Serving grant value
MP

Integer
(0 . . . 37) indicates E-
REL-8





(0 . . . 37)
DCH serving grant







index as defined in







[15].



>>E-DCH Transmission Time
MP

Integer(2, 10)
Unit is ms.
REL-8


Interval







>>E-AGCH Info
MP

E-AGCH Info

REL-8





10.3.6.100




>>HARQ info for E-DCH
MP

HARQ info

REL-8





for E-DCH







10.3.5.7d




>>Uplink DPCH power control
MP

Uplink

REL-8


info


DPCH power







control info







for Common







E-DCH







10.3.6.91a




>>E-DPCCH info
MP

E-DPCCH

REL-8





Info







10.3.6.98




>>E-DPDCH info
MP

E-DPDCH

REL-8





info







10.3.6.99




>>F-DPCH TPC command error
MP

Real
Downlink F-DPCH
REL-8


rate target


(0.01 . . . 0.1
information. The






by step of
actual value of dl-






0.01).
FDPCH-







TPCcommandErrorRate =







IE value * 0.01



>>Additional E-DCH
MP

Integer
In terms of TTIs.
REL-8


transmission back off


(0 . . . 15)




>>Maximum E-DCH resource
MP

Enumerated
In terms of TTIs.
REL-8


allocation for CCCH


(8, 12, 16,







24, 32, 40,







80, 120)




>>Maximum period for collision
MP

Integer
In terms of TTIs.
REL-8


resolution phase


(8..24)




>>E-DCH transmission
MP

Enumerated
In terms of TTIs. If set
REL-8


continuation back off


(0, 8, 16, 24,
to “infinity”, implicit






40, 80, 120,
common E-DCH






infinity)
resource release is







disabled.



>>ACK/NACK support on HS-
MP

Boolean
TRUE indicates that
REL-8


DPCCH



HS-DPCCH shall be







used when a common







E-DCH resource is







allocated to the UE







for DTCH/DCCH







transmission after







collision resolution.







FALSE indicates that







HS-DPCCH shall not







be used



>>Measurement Feedback Info
OP

Measurement

REL-8





Feedback







Info







10.3.6.40a




>>Common E-DCH Resource
MP
1 to


REL-8


Configuration information list

<maxEDCHs>





>>>Soffset
MP

Integer
(0 . . . 9) indicates
REL-8





(0 . . . 9)
symbol offset as







defined in [26]



>>>F-DPCH Code number
MP

Integer

REL-8





(0 . . . 255)




>>>E-RGCH Information
OP

E-RGCH

REL-8





Info







10.3.6.102




>>>E-HICH info
MP

E-HICH info

REL-8





10.3.6.101




>>>Uplink DPCH code info
MP

Uplink

REL-8





DPCH code







info for







Common E-







DCH







10.3.6.87b









MP means Mandatory Present and OP stands for Optional. An IE which is Mandatory Present always needs to be included and have a value while the value of an optional IE may be or not be present. MD stands for Mandatory Default. When an IE is set as mandatory default, a value for that IE is always needed, and a particular default value is mentioned.
Embodiments herein propose modifications to some IEs, as detailed below.
Common E-DCH Resource Configuration Information List
This IE is a list which comprises all the defined common E-DCH resources. A maximum of 32 common E-DCH resources may be included in this list. For each defined common E-DCH resource, the following IEs are defined:
Soffset
This IE is a MP IE which value ranges between 0 and 9. This value indicates the concrete slot within the F-DPCH in which the power control commands are included for a concrete F-DPCH code.
Instead of being MP, this IE in various embodiments is set as MD. If the IE is not present, “Soffset” takes a default value. The default value is a function of the position of the common E-DCH resource within the list, a function the “Soffset” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Soffset” value of a previous common E-DCH resource instance. The first defined common E-DCH resource would occupy position 0 (or 1). The second defined common E-DCH resource would occupy position 1 (or 2). Similar reasoning would apply with the other defined resources.
A concrete realization would be, for instance, if the “Soffset” value for the first instance of the common E-DCH resource takes a default value and the rest of the common E-DCH resources take a value related to the last instance.
For example, a simple formula is presented below to set default values for each defined common E-DCH resource.

Soffset=(offset+common E-DCH resource list position)mod 10

where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero.

“common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” may be zero (or one) for the first instance. If the IE is present, the signaled value overwrites the default value.
F-DPCH Code Number
This IE indicates the code to be used for the F-DPCH.
Instead of being MP, this IE is optional, conditional on value.
If the coding presented for the Soffset is applied, potentially, only three instances of the F-DPCH code number are needed, once for each 10 common E-DCH resources. Hence, in the best configuration, only three instances would need to be present.
Therefore, this IE is various embodiments is set as conditional on value (CV) so that this IE is mandatory present for the first occurrence. Alternatively, it should be mandatory present for the first occurrence or if the default value is equal to zero. Otherwise, this IE is optional. In addition, if this IE is not present, the value is equal to the last occurrence of this IE.
If the IE is present, the signaled value overwrites the default value.
E-HICH Info
E-HICH info contains two additional IEs. Changes in this IE would imply impacts in Release 6 and Release 7 of the 3GPP standards. In order to avoid impacts in earlier versions, a new IE may be used instead: “E-HICH info for common E-DCH”. Only two IEs would be needed as this feature only applies to FDD.
E-HICH Info for Common E-DCH
Channelisation Code
This IE may be set as a conditional on value (CV) IE so that the IE is mandatory only for the first instance and optional for the rest of them. If this IE is not present, the value is equal to the last occurrence of this IE.
If the IE is present, the signaled value overwrites the default value.
Signature Sequence
The value of this IE is a number between 0 and 39. This IE in various embodiments is set as MD. If the IE is not present, “Signature sequence” takes a default value.
The default value is a function of the position of the common E-DCH resource within the list, a function the “Signature Sequence” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Signature Sequence” value of a previous common E-DCH resource instance. The first defined common E-DCH resource would occupy position 0 (or 1). The second defined common E-DCH resource would occupy position 1 (or 2). Similar reasoning would apply with the other defined resources. A concrete realization may be, for instance, if the “Signature sequence” for the first instance of the common E-DCH resource would take a default value and the rest of the common E-DCH resources would take a value function of the last instance of the IE.
For example, a simple formula is presented below to set default values for each defined common E-DCH resource in which the IE is not present.

Signature Sequence=(offset+common E-DCH resource list position)mod 40

    
    
        where “offset” is the value of the last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first instance, “offset” is equal to zero.
        “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero (or one) for the first instance.
    
    


If the IE is present, the signaled value overwrites the default value.
Uplink DPCH Code Info for Common E-DCH
Scrambling code number is a MP present value. This IE takes a relative large number of bits for each common E-DCH resource. This IE in some embodiments is changed to conditional on value (CV) instead, avoiding including such a large number of bits per configured common E-DCH resource.
Conditional on value would mean that this IE is mandatory present for the first occurrence. Otherwise, this IE is optional. In addition, if this IE is not present, the value is of the IE is a function of the last instance. For instance, it may be a function of the position of the common E-DCH resource within the list of common E-DCH resources, a function the “Uplink DPCH code info for Common E-DCH” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Uplink DPCH code info for Common E-DCH” value of a previous common E-DCH resource instance.
The following formula illustrates how the default values may be set if the IE is not included:

Scrambling code number=offset+common E-DCH resource list position

    
    
        where “offset” is the value of the last occurrence of the IE “Scrambling code number”. If “offset” was not present in the first instance or occurrence, “offset” is equal to zero.
        “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero (or 1) for the first instance.
    
    


If the IE is present, the signaled value overwrites the default value.
E-DPDCH Info
E-DCH Minimum set E-TFCI
This IE is mandatory default. If this IE is missing, it means that there is no minimum E-TFCI set.
In the case of E-DCH in CELL_FACH and Idle Mode, the UE shall always send its message, especially CCCH messages. Otherwise, the UE will be blocked and, potentially, the UE will be dropped. It feels obvious that for E-DCH in CELL_FACH and Idle Mode, the E-DCH minimum set E-TFCI will be always included and it necessary must be a number above zero (E-TFCI index 0 would only let the UE to send the Scheduling Information).
Therefore, the semantic description may be modified so that for CELL_FACH and Idle Mode (or for Enhanced Uplink in CELL_FACH and Idle Mode), if the IE is not included, the E-DCH minimum set E-TFCI is set to a defined value. The only restriction for this value is that the value belongs to the set of values defined in E-TFCI table. The concrete table to be used is indicated in the IE “E-TFCI table index” included also in the IE “E-DPDCH info”. As mentioned before, E-TFCI value zero only lets the UE to transmit the Scheduling Information. Therefore, the minimum reasonable E-TFCI value so that the UE may transmit user or higher layers control data is the E-TFCI value 1.
If the IE is present, the signaled values overwrite the default value.
PRACH Preamble Control Parameters for Enhanced Uplink
This IE is characterised by available signatures, Preamble scrambling code numbers, and available Sub Channel Numbers.
Available Signatures
This is a bit string IE and each bit indicates whether a signature is used or not used. The signatures configured for RACH and included in the IE “Available Signatures” present in the IE “PRACH info (for RACH)”. These signatures cannot be used for Enhanced Uplink in CELL_FACH and Idle Mode. The IE “PRACH info (for RACH)” is included in the IE “PRACH System Information list” which is carried in SIB5. “PRACH System Information list”, “PRACH info (for RACH)” and “Available Signatures” are mandatory present IE. Hence, they will always be included in SIB5.
The IE “Available Signatures” contained in the IE “PRACH preamble control parameters for Enhanced Uplink” is also a mandatory present value; however, in embodiments herein this IE is optional and takes a default value. This default value is the same or a function of another IE, e.g., the “Available Signatures” present in the IE “PRACH info (for RACH)”.
As an example, the default value in various embodiments is a “NOT” or “INVERSE” function operation of the bit string values included in “Available Signatures” present in the IE “PRACH info (for RACH)”.
An illustrative example is presented to clarify the concept. If the value of the IE “Available Signatures” included in the IE “PRACH info (for RACH)” is: 1111111100000000, then the default value of the IE “Available Signatures” contained in the IE “Common E-DCH System Info” would be the inverse bit operation of (1111111100000000) which is equal to 0000000011111111. Therefore, the IE “available signatures” is set to mandatory default (MD) and the semantics of the description would say that the default value is the inverse bit-string indicated in the IE “Available Signature” in the IE “PRACH Info (for RACH)”. In other words, the available signatures for Enhanced Uplink in CELL_FACH are those signatures which are not used for RACH, unless the IE is present. Doing so, the base station 12 suppresses including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default value.
Preamble Scrambling Code Number
This IE is also included in the IE “PRACH info (for RACH)”. Embodiments herein teach that the scrambling code for the common E-DCH be the same as that of the RACH, at least by default. If it would be different, the new Preamble scrambling code number in various embodiments is a function of the Preamble scrambling code number present in the IE “PRACH info (for RACH)”. Hence, this IE in some embodiments is MD and by default equal to the IE “Preamble scrambling code number” indicated in the IE “PRACH info (for RACH),” and is otherwise a function of the IE “Preamble scrambling code number” indicated in the IE “PRACH info (for RACH)”.
As in the previous case, the base station 12 refrains from including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default value.
Available Sub Channel Number
This IE is a bit string. Each bit indicates availability for a sub channel, where the sub channels are numbered from “sub channel 0” to “sub channel 11”. The value 1 of a bit indicates that the corresponding sub channel is available and the value 0 indicates that it is not available.
This IE is also included in the IE “PRACH info (for RACH)”. This IE in some embodiments is also set to MD. The mandatory default value is a function of the IE “PRACH info (for RACH)”.
For example, this IE may be set equal to the IE “Available Sub Channel Number” indicated in the IE “PRACH info (for RACH)”. In another approach, the default value may be the INVERSE (or NOT) function of the IE Available Sub Channel Number indicated in the IE “PRACH info (for RACH)”
As in the previous case, the base station 12 refrains from including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default.
Applying the encoding suggested before, the structure of the IE “PRACH preamble control parameters for Enhanced Uplink” and other IEs involved would result in shown below, affected IEs are indicated with underlined text and non-affected IEs are defined in reference to 3GPP Technical Specification (TS) 25.331 section 10 version 10.0.0:
Common E-DCH system info is defined by IE in the table below.

















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version





UL interference for common E-
OP

UL

REL-8


DCH


interference







10.3.6.87




Common E-DCH MAC-d flows
MP

Common E-

REL-8





DCH MAC-d







flows







10.3.5.3b




CHOICE mode
MP



REL-8


>FDD




REL-8


>>PRACH preamble control
MP

PRACH
Control parameters of
REL-8


parameters (for Enhanced


preamble
the physical signal.



Uplink)


control







parameters







(for







Enhanced







Uplink)







10.3.6.54a




>>Initial Serving grant value
MP

Integer
(0 . . . 37) indicates E-
REL-8





(0 . . . 37)
DCH serving grant







index as defined in







[15].



>>E-DCH Transmission Time
MP

Integer(2, 10)
Unit is ms.
REL-8


Interval







>>E-AGCH Info
MP

E-AGCH Info

REL-8





10.3.6.100




>>HARQ info for E-DCH
MP

HARQ info

REL-8





for E-DCH







10.3.5.7d




>>Uplink DPCH power control
MP

Uplink

REL-8


info


DPCH power







control info







for Common







E-DCH







10.3.6.91a




>>E-DPCCH info
MP

E-DPCCH

REL-8





Info







10.3.6.98




>>E-DPDCH info
MP

E-DPDCH

REL-8





info







10.3.6.99




>>F-DPCH TPC command error
MP

Real
Downlink F-DPCH
REL-8


rate target


(0.01 . . . 0.1
information. The






by step of
actual value of dl-






0.01).
FDPCH-







TPCcommandErrorRate =







IE value * 0.01



>>Additional E-DCH
MP

Integer
In terms of TTIs.
REL-8


transmission back off


(0 . . . 15)




>>Maximum E-DCH resource
MP

Enumerated
In terms of TTIs.
REL-8


allocation for CCCH


(8, 12, 16,







24, 32, 40,







80, 120)




>>Maximum period for collision
MP

Integer
In terms of TTIs.
REL-8


resolution phase


(8..24)




>>E-DCH transmission
MP

Enumerated
In terms of TTIs. If set
REL-8


continuation back off


(0, 8, 16, 24,
to “infinity”, implicit






40, 80, 120,
common E-DCH






infinity)
resource release is







disabled.



>>ACK/NACK support on HS-
MP

Boolean
TRUE indicates that
REL-8


DPCCH



HS-DPCCH shall be







used when a common







E-DCH resource is







allocated to the UE







for DTCH/DCCH







transmission after







collision resolution.







FALSE indicates that







HS-DPCCH shall not







be used



>>Measurement Feedback Info
OP

Measurement

REL-8





Feedback







Info







10.3.6.40a




>>Common E-DCH Resource
MP
1 to


REL-8


Configuration information list

<maxEDCHs>





>>>Soffset
MD

Integer
(0 . . . 9) indicates
REL-8





(0 . . . 9)
symbol offset as







defined in [26] Note3



>>>F-DPCH Code number
CV-

Integer
If this IE is not
REL-8



Short

(0 . . . 255)
present, the value is







equal to the last







occurrence of this IE.



>>>E-RGCH Information
OP

E-RGCH

REL-8





Info







10.3.6.102




>>>E-HICH info for common E-
MP

E-HICH info

REL-8


DCH


for common







E-DCH







10.3.6.1xx




>>>Uplink DPCH code info
MP

Uplink

REL-8





DPCH code







info for







Common E-







DCH







10.3.6.87b




>TDD




REL-8


>>CHOICE TDD option
MP



REL-8


>>>7.68 Mcps TDD


NULL

REL-8


>>>3.84 Mcps TDD


NULL

REL-8


>>>1.28 Mcps TDD




REL-8


>>>>E-RUCCH Info
MP

E-RUCCH

REL-8





Info 1.28







Mcps TDD







10.3.6.103a




>>>>E-PUCH info
MP

E-PUCH Info
Note1
REL-8





1.28 Mcps







TDD







10.3.6.104a




>>>>E-HICH info
MP

E-HICH info
Note1
REL-8





1.28 Mcps







TDD







10.3.6.101a




>>>>E-AGCH Info
MP

E-AGCH Info
Note1
REL-8





1.28 Mcps







TDD







10.3.6.100a




>>>>HARQ info for E-DCH
MP

HARQ info

REL-8





for E-DCH







10.3.5.7d




>>>>CCCH transmission info
MP


Note2
REL-8


>>>>>Common E-RNTI info
MP

Common E-

REL-8





RNTI info







10.3.3.7a




>>>>>HARQ maximum number
MP

Integer

REL-8


of retransmissions


(0 . . . 7)




>>>>>HARQ retransmission
MP

Enumerated
Unit: ms
REL-8


timer


(10, 15, 20,







25, 30, 35,







40, 45, 50,







55, 60, 65,







70, 75, 80,







85, 90, 95,







100, 110,







120, 140,







160)




>>>>>HARQ power offset
MP

Integer

REL-8





(0 . . . 6)













Condition
Explanation






Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.





Note1: These IEs correspond to the HS-DSCH configuration for CELL_FACH, CELL_PCH and URA_PCH state on primary frequency, the configuration on secondary frequency is signalled to UE via dedicated signalling.


Note2: These IEs correspond to CCCH transmission configuration for CELL_FACH state on the primary frequency and secondary frequency.


Note3: The default value is defined by: Soffset = (offset + common E-DCH resource list position) mod 10 where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






E-DPDCH Info is characterised by IEs below.















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







E-TFCI table index
MP

Integer
Indicates which
REL-6





(0 . . . 1)
standardised E-







TFCI TB size







table shall be







used. See Note







3.



E-DCH minimum set E-TFCI
MD

Integer
See [15];
REL-6





(0 . . . 127)
Absence means







no E-DCH







minimum set.







In CELL FACH







and Idle Mode,







the default value







is 1.



Reference E-TFCIs
MP
1 to 8

See [29]
REL-6


>Reference E-TFCI
MP

Integer

REL-6





(0 . . . 127)




>Reference E-TFCI PO
MP

Integer
Refer to
REL-6





(0 . . . 29,
quantization of







the power offset







in [28]






30, 31)
Values 30 and
REL-7






31 are only used







for E-TFCI >







ETFCI Boost



Minimum reduced E-DPDCH
OP

Enumerated
βed,k,reduced,min
REL-8


gain factor


(8/15, 11/15,
[29]; the default






15/15, 21/15,
value is 8/15. If






30/15, 42/15,
the configurable






60/15, 84/15)
reduced E-







DPDCH gain







factor is not







supported by the







UE, the default







value is used.



Maximum channelisation codes
MP

Enumerated

REL-6





(sf256, sf128,







sf64, sf32,







sf16, sf8, sf4,







2sf4, 2sf2,







2sf2and2sf4)




PLnon-max
MP

Real (0.44
As defined in
REL-6





. . 1.0 by step of
[27]






0.04)




Scheduling Information
MP



REL-6


Configuration







>Periodicity for Scheduling Info -
MD

Enumerated
Values in ms.
REL-6


no grant


(everyEDCHTTI,
Default value is






4, 10, 20, 50,
“no report”






100, 200, 500, 1000)
NOTE 1.



>Periodicity for Scheduling Info -
MD

Enumerated
Values in ms.
REL-6


grant


(everyEDCHTTI,
Default value is






4, 10, 20, 50,
“no report”






100, 200, 500, 1000)
NOTE 1.



>Power Offset for Scheduling
MP

Integer
Only used when
REL-6


Info


(0 . . . 6)
no MACd PDUs







are included in







the same MACe







PDU. Unit is in







dB.



3-Index-Step Threshold
MD

Integer
Refers to an
REL-6





(0 . . . 37)
index in the







“SG-Table” (see







[15]).







Default value is







0. NOTES 2, 3.



2-Index-Step Threshold
MD

Integer
Refers to an
REL-6





(0 . . . 37)
index in the







“SG-Table” (see







[15]).







Default value







is 0.







NOTES 2, 3.





NOTE 1: If the Periodicity is set to 4 ms and the E-DCH TTI is set to 10 ms, the UE shall interpret the periodicity value as 10 ms.


NOTE 2: If the 3-index-Step Threshold value is greater than 2-index-Step Threshold, the UE behaviour is unspecified.


NOTE 3: If the UE is operating in 16QAM mode, the value of “E-TFCI table index” is increased by 2, and indices in the SG-Table refer to Scheduling Grant Table 2 in [15].






E-HICH Info for Common E-DCH is characterised by IEs below

















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version





Channelisation Code
CV-Short

Integer
If this IE is not
REL-8





(0 . . . 127)
present, the value







is equal to the last







occurrence of this







IE.



Signature Sequence
MD

Integer
Note1
REL-8





(0 . . . 39)













Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.





Note1: The default value is defined by: Signature Sequence = (offset + common E-DCH resource list position) mod 40 where “offset” is the value of the last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first occurrence, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position ” is zero for the first instance.






Uplink DPCH code info for Common E-DCH is characterised by IEs below.

















Information







Element/


Type and
Semantics



Group name
Need
Multi
reference
description
Version





Scrambling
MP

Enumerated

REL-8


code type


(short, long)




Scrambling
CV-

Integer
Note1
REL-8


code number
Short

(0 . . . 16777215)













Condition
Explanation






Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.





Note1: If this IE is not included, the value is given by: Scrambling code number = offset + common E-DCH resource list position where “offset” is the value of the last occurrence of the IE “scrambling code number”.If the IE “scrambling code number” is not present in the first occurrence, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






As stated above the processing at the base station 12 may include in some embodiments encoding system information that directly indicates access request preambles for one contention-based uplink channel and that indirectly indicates access request preambles for another contention-based uplink channel based on or as a function of the directly indicated preambles. The changed IEs are indicated with underlined text:
PRACH preamble control parameters (for Enhanced Uplink) is characterised by IEs below.















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







Available Signature
MD

Bit string(16)
The default value is
REL-8






the inverse bitstring







indicated in the IE







“Available Signature”







in the IE “PRACH Info







(for RACH)”.







Each bit indicates







availability for a







signature.







Each available







signature on the







AICH is associated







with one Common E-







DCH Resource







Configuration in the







“Common E-DCH







resource







configuration







information list”.



E-AI Indication
MP

BOOLEAN
TRUE: E-AIs are in
REL-8






use on the AICH.







FALSE: E-AIs are not







in use on the AICH.



Preamble scrambling code
MD

Integer (0 . . . 15)
The default value is
REL-8


number



the value indicated in







the IE “Preamble







scrambling code







number” in the IE







“PRACH Info (for







RACH)”.







Identification of







scrambling code, see







[28]



Available Sub Channel Number
MD

Bit string(12)
The default value is
REL-8






the same value







indicated in the IE







“Available Signatures”







in the IE “PRACH







system information







list”.







Each bit indicates







availability for a







subchannel, where







the subchannels are







numbered







“subchannel 0” to







“subchannel 11”. The







value 1 of a bit







indicates that the







corresponding







subchannel is







available and the







value 0 indicates that







it is not available.



PRACH partitioning
MD

PRACH
Default value is the
REL-8





partitioning
value of “PRACH






10.3.6.53
partitioning” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



Persistence scaling factors
OP

Persistence
This IE shall not be
REL-8





scaling
present if only ASC 0






factors
and ASC 1 are






10.3.6.48
defined. If this IE is







absent, default value







is the value of







“Persistence scaling







factors” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis, if







value exists



AC-to-ASC mapping
MD

AC-to-ASC
Default value is the
REL-8





mapping
value of “AC-to-ASC






10.3.6.1
mapping” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



Primary CPICH TX power
MD

Primary
Default value is the
REL-8





CPICH TX
value of “Primary






power
CPICH TX power” in






10.3.6.61
the first occurrence in







list “PRACH system







information list” in







SIB5 or SIB5bis.



Constant value
MD

Constant
Default value is the
REL-8





value
value of “Constant






10.3.6.11
value” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis



PRACH power offset
MD

PRACH
Default value is the
REL-8





power offset
value of “PRACH






10.3.6.54
power offset” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis



PRACH transmission
MD

RACH
Default value is the
REL-8


parameters


transmission
value of “RACH






parameters
transmission






10.3.6.67
parameters” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



AICH info
MD

AICH info
Default value is the
REL-8





10.3.6.2
value of “AICH info” in







the first occurrence in







list “PRACH system







information list” in







SIB5 or SIB5bis.



Power offset Pp-e
MP

Integer
In dB. Power offset
REL-8





(−5 . . . 10)
between the last







transmitted preamble







and the initial DPCCH







transmission as







defined in [26]









The encoding code, e.g. ASN 1 code, may be updated as it follows only relevant IEs have been added:













SysInfoType5 ::=
SEQUENCE {








  sib6indicator
BOOLEAN,


 -- Physical channel IEs


  pich-PowerOffset
PICH-PowerOffset,


  modeSpecificInfo
CHOICE {








   fdd
SEQUENCE {








    aich-PowerOffset
AICH-PowerOffset


   },








   tdd
SEQUENCE {







 -- If PDSCH/PUSCH is configured for 1.28Mcps or 7.68Mcps TDD, the following IEs should


be absent


 -- and the info included in the respective tdd128SpecificInfo or tdd768SpecificInfo


instead.


 -- If PDSCH/PUSCH is configured for 3.84Mcps TDD in R5, HCR-r5-SpecificInfo should also


be


 -- included.









    pusch-SysInfoList-SFN
PUSCH-SysInfoList-SFN
OPTIONAL,


    pdsch-SysInfoList-SFN
PDSCH-SysInfoList-SFN
OPTIONAL,


    openLoopPowerControl-TDD
OpenLoopPowerControl-TDD


   }


  },









  primaryCCPCH-Info
PrimaryCCPCH-Info
OPTIONAL,


  prach-SystemInformationList
PRACH-SystemInformationList,


  sCCPCH-SystemInformationList
SCCPCH-SystemInformationList,







  -- cbs-DRX-Level1Information is conditional on any of the CTCH indicator IEs in


  -- sCCPCH-SystemInformationList









  cbs-DRX-Level1Information
CBS-DRX-Level1Information
OPTIONAL,








-- Extension mechanism for non- release99 information



  v4b0NonCriticalExtensions  SEQUENCE {


   sysInfoType5-v4b0ext    SysInfoType5-v4b0ext-IEs
OPTIONAL,


  -- Extension mechanism for non- rel-4 information


   v590NonCriticalExtensions  SEQUENCE {








    sysInfoType5-v590ext    SysInfoType5-v590ext-IEs
OPTIONAL,


    v650NonCriticalExtensions  SEQUENCE {


     sysInfoType5-v650ext    SysInfoType5-v650ext-IEs


OPTIONAL,


     v680NonCriticalExtensions  SEQUENCE {


      sysInfoType5-v680ext    SysInfoType5-v680ext-IEs


OPTIONAL,


      v690NonCriticalExtensions  SEQUENCE {


       sysInfoType5-v690ext    SysInfoType5-v690ext-IEs,


       v770NonCriticalExtensions  SEQUENCE {


        sysInfoType5-v770ext    SysInfoType5-v770ext-IEs,


        v860NonCriticalExtensions  SEQUENCE {


         sysInfoType5-v860ext    SysInfoType5-v860ext-


IEs,


         v890NonCriticalExtensions  SEQUENCE {


          sysInfoType5-v890ext    SysInfoType5-


v890ext-IEs,


          v8b0NonCriticalExtensions  SEQUENCE {


           sysInfoType5-v8b0ext









SysInfoType5-







v8b0ext-IEs,


           v8c0NonCriticalExtensions  SEQUENCE {


            sysInfoType5-v8c0ext


            nonCriticalExtensions   SEQUENCE { }  OPTIONAL


           }  OPTIONAL


          }  OPTIONAL


         }  OPTIONAL


        }  OPTIONAL


       }  OPTIONAL


      }  OPTIONAL


     }  OPTIONAL


    }  OPTIONAL


   }  OPTIONAL


  }  OPTIONAL


}


SysInfoType5-v890ext-IEs ::= SEQUENCE {









 secondFrequencyInfo
FrequencyInfoTDD
OPTIONAL,







 -- The field ‘dummy’ shall be marked absent in SysInfoType5 and SysInfoType5bis. A


failure to


 -- comply with this requirement may prevent the UE to receive any service in the cell.


The UE


 -- may treat the cell as barred.









 dummy
SEQUENCE { }
OPTIONAL


}







SysInfoType5-v8c0ext-IEs ::= SEQUENCE {









 commonEDCHSystemInfo
CommonEDCHSystemInfo
OPTIONAL


}







PRACH-PreambleForEnhancedUplink ::= SEQUENCE {









 availableSignatures
AvailableSignatures
OPTIONAL,


 e-ai-Indication
BOOLEAN,


 preambleScramblingCodeWordNumber
PreambleScramblingCodeWordNumber
OPTIONAL,


 availableSubChannelNumbers
AvailableSubChannelNumbers
OPTIONAL,


 prach-Partitioning
PRACH-Partitioning-r7
OPTIONAL,


 persistenceScalingFactorList
PersistenceScalingFactorList
OPTIONAL,


 ac-To-ASC-MappingTable
AC-To-ASC-MappingTable
OPTIONAL,


 primaryCPICH-TX-Power
PrimaryCPICH-TX-Power
OPTIONAL,


 constantValue
ConstantValue
OPTIONAL,


 prach-PowerOffset
PRACH-PowerOffset
OPTIONAL,


 rach-TransmissionParameters
RACH-TransmissionParameters
OPTIONAL,


 aich-Info
AICH-Info
OPTIONAL,


 powerOffsetPp-e
INTEGER (−5..10)


}







Common-E-DCH-ResourceInfoList ::= SEQUENCE {









 s-offset
INTEGER (0..9)
OPTIONAL,


 f-dpch-ChannelisationCodeNumber
INTEGER (0..255)
OPTIONAL,


 e-RGCH-Information
E-RGCH-Information
OPTIONAL,


 e-hich-Info
E-HICH-Information-CommonEdch,


 ul-DPCH-CodeInfoForCommonEDCH
UL-DPCH-CodeInfoForCommonEDCH


}







UL-DPCH-CodeInfoForCommonEDCH ::= SEQUENCE {









 ul-DPCCHscramblingCodeType
ScramblingCodeType,



 ul-DPCCHscramblingCode
UL-ScramblingCode
OPTIONAL


}


E-HICH-Information-CommonEdch ::=
SEQUENCE {


 channelisationCode
E-HICH-ChannelisationCode


 OPTIONAL,


 signatureSequence
E-HICH-RGCH-SignatureSequence


 OPTIONAL


}









In some embodiments, a second approach may be taken to provide a backward 55 compatible solution.
In this case a new IE needs to be added in SIB5, “Common E-DCH System Info Short”, for instance. This new IE may comprise the new encoding.
The tabular of SIB5 would be as follows:
System Information Block Type 5 and 5bis















Information


Type and
Semantics



Element/Group name
Need
Multi
reference
description
Version







SIB6 Indicator
MP

Boolean
TRUE indicates that







SIB6 is broadcast in the







cell.







When the UE receives







SIB5 in the System







Information Container







message, this IE is







interpreted as FALSE



PhyCH information







elements







PICH Power offset
MP

PICH
If the cell is operating in






Power
MBSFN mode as






offset
indicated in subclause






10.3.6.50
8.1.1.6.3 the UE







behaves as if this IE







would not have been







received.



CHOICE mode
MP






>FDD







>>AICH Power offset
MP

AICH
If the cell is operating in






Power
MBSFN mode as






offset
indicated in subclause






10.3.6.3
8.1.1.6.3 the UE







behaves as if this IE







would not have been







received.



>TDD







>>PUSCH system
OP

PUSCH
If the cell is operating in



information


system
MBSFN mode as






information
indicated in subclause






10.3.6.66
8.1.1.6.3 the UE







behaviour upon







reception of this IE is







unspecified.



>>PUSCH system
OP

PUSCH
Only for 7.68 Mcps TDD
REL-7


information VHCR


system
If the cell is operating in






information
MBSFN mode as






VHCR
indicated in subclause






10.3.6.66a
8.1.1.6.3 the UE







behaviour upon







reception of this IE is







unspecified.



>>PDSCH system
OP

PDSCH
If the cell is operating in



information


system
MBSFN mode as






information
indicated in subclause






10.3.6.46
8.1.1.6.3 the UE







behaviour upon







reception of this IE is







unspecified.



>>TDD open loop power
MP

TDD open
If the cell is operating in



control


loop
MBSFN mode as






power
indicated in subclause






control
8.1.1.6.3 the UE






10.3.6.79
behaves as if this IE







would not have been







received.



Primary CCPCH info
OP

Primary
Note 1






CCPCH







info







10.3.6.57




PRACH system
MP

PRACH
If the cell is operating in



information list


system
MBSFN mode as






information
indicated in subclause






list
8.1.1.6.3 the UE






10.3.6.55
behaves as if this IE







would not have been







received.



Common E-DCH system
OP

Common

REL-8


info


E-DCH







system







info







10.3.6.9a




Common E-DCH system
OP

Common

REL-8


info short


E-DCH







system







info short







10.3.6.9b




Secondary CCPCH
MP

Secondary
Note 2



system information


CCPCH
If the cell is operating in






system
MBSFN mode as






information
indicated in subclause






10.3.6.72
8.1.1.6.3 the UE







behaves as if this IE







would not have been







received.



CBS DRX Level 1
CV-

CBS DRX




information
CTCH

Level 1







information







10.3.8.3




Frequency band indicator
OP

Frequency

REL-6





band







indicator







10.3.6.35b




Frequency band indicator 2
OP

Frequency

REL-6





band







indicator 2







10.3.6.35c




HSDPA cell Indicator
MD

Enumerated
Default is ‘HSDPA
REL-6





(HSDPA
capability not indicated’.






Capable
‘HSDPA Capable Cell’






Cell)
means that the UE may







consider this cell as part







of the HSDPA coverage







area for display







indication only.







This indication shall not







be used for any other







purpose.







If the cell is operating in







MBSFN mode as







indicated in subclause







8.1.1.6.3 the UE







behaves as if this IE







would not have been







received.



E-DCH cell Indicator
MD

Enumerated
Default is ‘E-DCH
REL-6





(E-
capability not indicated’.






DCH
‘E-DCH Capable Cell’






Capable
means that the UE may






Cell)
consider this cell as part







of the E-DCH coverage







area for display







indication only.







This indication shall not







be used for any other







purpose.







If the cell is operating in







MBSFN mode as







indicated in subclause







8.1.1.6.3 the UE







behaves as if this IE







would not have been







received.



Secondary CCPCH
OP

Secondary
Included if MCCH is on
REL-6


system information


CCPCH
an S-CCPCH used only



MBMS


system
for MBMS. Note 2






information







MBMS







10.3.6.72a




CHOICE mode
OP



REL-7


>FDD




REL-7


>>HS-DSCH common
MP

HS-DSCH
Included if cell supports
REL-7


system information


common
HS-DSCH reception in






system
CELL_FACH and






information
during IDLE to RRC






10.3.6.36c
Connection state







transition.



>>HS-DSCH paging
OP

HS-DSCH
Included if cell supports
REL-7


system information


paging
for UEs in RRC






system
Connected state paging






information
message reception on






10.3.6.36d
HS-DSCH.



>TDD




REL-7


>>HS-DSCH common
MP

HS-DSCH
Included if cell supports
REL-8


system information


common
HS-DSCH reception in






system
CELL_FACH and






information
during IDLE to RRC






1.28Mcps
Connection state






TDD
transition.






10.3.6.36ca




>>HS-DSCH paging
OP

HS-DSCH
Included if cell supports
REL-8


system information


paging
for UEs in RRC






system
Connected state paging






information
message reception on






1.28Mcps
HS-DSCH.






TDD







10.3.6.36da




TDD MBSFN information
OP

TDD
TDD only: included only
REL-7





MBSFN
if some timeslots are






Information
designated to MBSFN.






10.3.6.78b




HS-DSCH DRX in
OP

HS-DSCH

REL-8


CELL_FACH Information


DRX in







CELL_FACH







Information







10.3.6.36g




HS-DSCH DRX in
OP

HS-DSCH

REL-8


CELL_FACH Information


DRX in




1.28 Mcps TDD


CELL_FACH







Information







1.28







Mcps







TDD







10.3.6.36h




Second Frequency info
OP

Integer (0 . . . 16383)
Note 3
REL-8


Treset Usage Indicator
OP

Enumerated
Only for 1.28 Mcps
REL-8





(TRUE)
TDD. The presence of







this IE means the timer







Treset is not valid when







the dedicated H-RNTI is







configured in







CELL_FACH and







CELL_PCH.



UpPCH Position Info
CV-

Integer (0 . . . 127)
Only for 1.28 Mcps
REL-8



Frequency


TDD.









The new IE may then be defined as follows:
Common E-DCH System Info Short

















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version





UL interference for common E-
CV-

UL

REL-8


DCH
Optional

interference







10.3.6.87




Common E-DCH MAC-d flows
CV-

Common E-

REL-8



Mandatory

DCH MAC-d







flows







10.3.5.3b




PRACH preamble control
CV-

PRACH
Control parameters of
REL-8


parameters (for Enhanced
Mandatory

preamble
the physical signal.



Uplink)


control







parameters







(for







Enhanced







Uplink)







10.3.6.54a




Initial Serving grant value
CV-

Integer
(0 . . . 37) indicates E-
REL-8



Mandatory

(0 . . . 37)
DCH serving grant







index as defined in







[15].



E-DCH Transmission Time
CV-

Integer (2, 10)
Unit is ms.
REL-8


Interval
Mandatory






E-AGCH Info
CV-

E-AGCH Info

REL-8



Mandatory

10.3.6.100




HARQ info for E-DCH
CV-

HARQ info

REL-8



Mandatory

for E-DCH







10.3.5.7d




Uplink DPCH power control info
CV-

Uplink

REL-8



Mandatory

DPCH power







control info







for Common







E-DCH







10.3.6.91a




E-DPCCH info
CV-

E-DPCCH

REL-8



Mandatory

Info







10.3.6.98




E-DPDCH info
CV-

E-DPDCH

REL-8



Mandatory

info







10.3.6.99




F-DPCH TPC command error
CV-

Real
Downlink F-DPCH
REL-8


rate target
Mandatory

(0.01 . . . 0.1 by
information. The






step of 0.01).
actual value of dl-







FDPCH-







TPCcommandErrorRate =







IE value * 0.01



Additional E-DCH transmission
CV-

Integer
In terms of TTIs.
REL-8


back off
Mandatory

(0 . . . 15)




Maximum E-DCH resource
CV-

Enumerated
In terms of TTIs.
REL-8


allocation for CCCH
Mandatory

(8, 12, 16,







20, 24, 32,







40, 80)




Maximum period for collision
CV-

Integer
In terms of TTIs.
REL-8


resolution phase
Mandatory

(8 . . . 24)




E-DCH transmission
CV-

Enumerated
In terms of TTIs. If set
REL-8


continuation back off
Mandatory

(0, 4, 8, 16,
to “infinity”, implicit






24, 40, 80,
common E-DCH






infinity)
resource release is







disabled.



ACK/NACK support on HS-
CV-

Boolean
TRUE indicates that
REL-8


DPCCH
Mandatory


HS-DPCCH shall be







used when a common







E-DCH resource is







allocated to the UE







for DTCH/DCCH







transmission after







collision resolution.







FALSE indicates that







HS-DPCCH shall not







be used



Measurement Feedback Info
CV-

Measurement

REL-8



Optional

Feedback







Info







10.3.6.40a




Common E-DCH Resource
MP
1 to


REL-8


Configuration information list

<maxEDCHs>





>Soffset
MD

Integer (0 . . . 9)
(0 . . . 9) indicates
REL-8






symbol offset as







defined in [26] Note3



>F-DPCH Code number
CV-

Integer
If this IE is not
REL-8



Short

(0 . . . 255)
present, the value is







equal to the last







occurrence of this IE.



>E-RGCH Information
CV-

E-RGCH

REL-8



Short

Info







10.3.6.102




>E-HICH info for common E-
MD

E-HICH info

REL-8


DCH


for common







E-DCH







10.3.6.1xx




>Uplink DPCH code info
MD

Uplink

REL-8





DPCH code







info for







Common E-







DCH







10.3.6.87b













Condition
Explanation






Optional
If the IE “Common E-DCH System Info” is present,




the value of the IE is the same value of corresponding




IE in the IE “Common E-DCH system info”.




Otherwise, this IE is optional.



Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.



Mandatory
If the IE “Common E-DCH System Info” is present,




the value of the IE is the same value of the




corresponding IE in the IE “Common E-DCH System




Info”. Otherwise, this IE is mandarory present.





NOTE: Only for FDD.


Note1: These IEs correspond to the HS-DSCH configuration for CELL_FACH, CELL_PCH and URA_PCH state on primary frequency, the configuration on secondary frequency is signalled to UE via dedicated signalling.


Note2: These IEs correspond to CCCH transmission configuration for CELL_FACH state on the primary frequency and secondary frequency.


Note3: The default value is defined by: Soffset = (offset + common E-DCH resource list position) mod 10 where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






Additional conditions may be placed in other to reduce the signalling in case the IE “Common E-DCH System Info” is included. The affected IEs are underlined below:
PRACH Preamble Control Parameters (for Enhanced Uplink)















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







Available Signature
MD

Bit string(16)
The default value is
REL-8






the inverse bitstring







indicated in the IE







“Available Signature”







in the IE “PRACH Info







(for RACH)”.







Each bit indicates







availability for a







signature.







Each available







signature on the







AICH is associated







with one Common E-







DCH Resource







Configuration in the







“Common E-DCH







resource







configuration







information list”.



E-AI Indication
MP

BOOLEAN
TRUE: E-AIs are in
REL-8






use on the AICH.







FALSE: E-AIs are not







in use on the AICH.



Preamble scrambling code
MD

Integer (0 . . . 15)
The default value is
REL-8


number



the value indicated in







the IE “Preamble







scrambling code







number” in the IE







“PRACH Info (for







RACH)”.







Identification of







scrambling code, see







[28]



Available Sub Channel Number
MD

Bit string(12)
The default value is
REL-8






the same value







indicated in the IE







“Available Signatures”







in the IE “PRACH







system information







list”.







Each bit indicates







availability for a







subchannel, where







the subchannels are







numbered







“subchannel 0” to







“subchannel 11”. The







value 1 of a bit







indicates that the







corresponding







subchannel is







available and the







value 0 indicates that







it is not available.



PRACH partitioning
MD

PRACH
Default value is the
REL-8





partitioning
value of “PRACH






10.3.6.53
partitioning” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



Persistence scaling factors
OP

Persistence
This IE shall not be
REL-8





scaling
present if only ASC 0






factors
and ASC 1 are






10.3.6.48
defined. If this IE is







absent, default value







is the value of







“Persistence scaling







factors” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis, if







value exists



AC-to-ASC mapping
MD

AC-to-ASC
Default value is the
REL-8





mapping
value of “AC-to-ASC






10.3.6.1
mapping” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



Primary CPICH TX power
MD

Primary
Default value is the
REL-8





CPICH TX
value of “Primary






power
CPICH TX power” in






10.3.6.61
the first occurrence in







list “PRACH system







information list” in







SIB5 or SIB5bis.



Constant value
MD

Constant
Default value is the
REL-8





value
value of “Constant






10.3.6.11
value” in the first







occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis



PRACH power offset
MD

PRACH
Default value is the
REL-8





power offset
value of “PRACH






10.3.6.54
power offset” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis



PRACH transmission
MD

RACH
Default value is the
REL-8


parameters


transmission
value of “RACH






parameters
transmission






10.3.6.67
parameters” in the







first occurrence in list







“PRACH system







information list” in







SIB5 or SIB5bis.



AICH info
MD

AICH info
Default value is the
REL-8





10.3.6.2
value of “AICH info” in







the first occurrence in







list “PRACH system







information list” in







SIB5 or SIB5bis.



Power offset Pp-e
MP

Integer (−5 . . . 10)
In dB. Power offset
REL-8






between the last







transmitted preamble







and the initial DPCCH







transmission as







defined in [26]









E-HICH Info Common for E-DCH


















Information







Element/


Type and
Semantics


Group name
Need
Multi
reference
description
Version





Channelisation
CV-

Integer
For the first
REL-8


Code
Short

(0..127)
occurrence, if this






IE is not present,






the value of this IE






is the value of last






occurrence of the






IE “Channelisation






Code” present in






the IE “Common






E-DCH system






info”.






For subsequent






occurecences, if






the IE is not






present, the value






is equal to the last






occurence of this






IE.


Signature
MD

Integer
Note1
REL-8


Sequence


(0..39)













Short
If the IE “Common E-DCH system info” is not present,




this IE is mandatory present for the first occurrence.




Otherwise, this IE is optional,







Note1: The default value is defined by: Signature Sequence = (offset + common E-DCH resource list position) mod 40 where “offset” is the value of last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






The IEs “E-DPCH info” and “Uplink DPCH code info for Common E-DCH” may not be changed compared with the first solution.
The encoding improvement of each IE present in “Common E-DCH System Info” are independent from other IEs.
FIG. 4 is a block diagram depicting the base station 12 according to embodiments herein. To support the above downlink control signaling, the base station 12 in some embodiments includes one or more transmit/receive antennas 402, along with associated transmitter (TX) circuit 404 and receiver (RX) circuit 401, respectively, and further includes one or more processing circuits 403. The processing circuit 403 of the base station 12 encodes system information that indicates available resources of a CB channel relative to other available resources of that CB channel, e.g., relative to the position in which other available resources are indicated in the system information, rather than indicating each resource independently. In some embodiments, for example, the available resources are indicated in an ordered list, and the processing circuit 403 encodes the system information to indicate available resources as a function of their position in the list relative to other resources. This may entail, for instance, suppressing encoding that would directly indicate certain access request preambles. The TX circuit 404 is then configured to broadcast the encoded system information to mobile terminals 10-10-N, via transmit antennas 402.
In some embodiments, the processing circuit 403 is further configured to encode system information that directly indicates access request preambles for one of the CB channels and that indirectly indicates access request preambles for the other CB channel based on or as a function of the directly indicated preambles. The TX circuit 404 then broadcasts this system information much in the same way as described above. This may entail, for instance, suppressing encoding that would directly indicate certain access request preambles.
Thus, the base station 12 for managing access to a wireless communications network is exemplified in FIG. 4. The base station 12 comprises the processing circuit 403 configured to encode system information indicating the second available resource of the contention based channel relative to the first available resource of the contention based channel. Also, the base station 12 comprise the TX circuit 404 configured to broadcast the system information. The contention based channel in some embodiments corresponds to a random access channel, RACH, or a common Enhanced Dedicated Channel, E-DCH. Furthermore, the system information may be comprised in a System Information Block type 5, SIB5. The second available resource is in some embodiments indicated in an ordered list of resources as a function of a position of the first available resource in the ordered list. The ordered list may define common Enhanced-Dedicated Channel, E-DCH, resources. Each E-DCH Resource may in its turn be defined by an Soffset information element, a Fractional Dedicated Physical Control Channel, F-DPCH, code number information element, and an E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel, E-HICH, info for common E-DCH information element. In some embodiments the position of the second available resource in the ordered list is defined by a default value in the Soffset information element. The default value may be a function of the position of the second available resource within the ordered list; a function of a “Soffset” value of a previous first available resource; or a function of the position of the second available resource and an offset value. The offset value is an Soffset value of the first available resource. The F-DPCH code number information element may be the same for a maximum of ten common E-DCH resources. In some embodiments the E-HICH info for common E-DCH information element is defined by a channelization code and a signature sequence. A default value of the signature sequence may be a function of the position of the second available resource within the ordered list; a function of a “Signature Sequence” value of a previous first available resource; or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource. In some embodiments a channelization code of the second available resource is equal to a channelization code of the first available resource. The second available resource is in some embodiments defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel. The value may be a function of the position of the second available resource within the ordered list of common E-DCH resources; a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.
FIG. 5 is a schematic flow chart depicting a method in a mobile terminal for requesting access to a wireless communication system according to embodiments herein.
Step 501.
The mobile terminal receives the broadcasted system information that indicates a first available resource of a contention based channel. In some embodiments the contention based channel corresponds to a random access channel, RACH, or a common Enhanced Dedicated Channel, E-DCH. In some embodiments the received broadcasted system information is comprised in a System Information Block type 5, SIB5.
Step 502.
The mobile terminal 10 derives a second available resource of the contention based channel based on the first available resource of the contention based channel. A common E-DCH resource may be defined as an UL scrambling code, an F-DPCH code number and timing offset ‘Soffset’, E-HICH channelisation codes and signature sequences etc.
In some embodiments the second available resource is indicated in an ordered list of resources as a function of a position of the first available resource in the ordered list.
In some embodiments the ordered list is defining common Enhanced-Dedicated Channel, E-DCH, resources, which each E-DCH Resource is defined by an Soffset information element, an Fractional Dedicated Physical Control Channel, F-DPCH, code number information element, and an E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel, E-HICH, info for common E-DCH information element.
In some embodiments the position of the second available resource in the ordered list is defined by a default value in the Soffset information element, which default value is a function of the position of the second available resource within the ordered list, a function of a “Soffset” value of a previous first available resource, or a function of the position of the second available resource and an offset value, which offset value is an Soffset value of the first available resource.
In some embodiments the F-DPCH code number information element is the same for a maximum of ten common E-DCH resources.
In some embodiments the E-HICH info for common E-DCH information element is defined by a channelization code and a signature sequence, and a default value of the signature sequence is a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource.
In some embodiments, a channelization code of the second available resource is equal to a channelization code of the first available resource.
In some embodiments the second available resource is defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, which value is a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.
Consider a specific example in 3GPP specifications, whereby available resources comprise a combination of a power control command channel time slot, a power control command channel coding, and the like, with each component of an available resource being indicated relative to a corresponding component of another available resource.
Common E-DCH Resource Configuration Information List
This IE is a list which contains all the defined common E-DCH resources. A maximum of 32 common E-DCH resources may be included in this list. For each defined common E-DCH resource, the following IEs are defined:
Soffset
This IE is a MP IE which value ranges between 0 and 9. This value indicates the concrete slot within the F-DPCH in which the power control commands are included for a concrete F-DPCH code.
Instead of being MP, this IE in various embodiments is set as MD. If the IE is not present, “Soffset” takes a default value. The default value is a function of the position of the common E-DCH resource within the list, a function the “Soffset” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Soffset” value of a previous common E-DCH resource instance. The first defined common E-DCH resource would occupy position 0 (or 1). The second defined common E-DCH resource would occupy position 1 (or 2). Similar reasoning would apply with the other defined resources.
A concrete realization would be, for instance, if the “Soffset” value for the first instance of the common E-DCH resource takes a default value and the rest of the common E-DCH resources take a value related to the last instance.
For example, a simple formula is presented below to set default values for each defined common E-DCH resource.

Soffset=(offset+common E-DCH resource list position)mod 10

where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero.

“common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” may be zero (or one) for the first instance. If the IE is present, the signaled value overwrites the default value.
F-DPCH Code Number
This IE indicates the code to be used for the F-DPCH.
Instead of being MP, this IE is optional, conditional on value.
If the coding presented for the Soffset is applied, potentially, only three instances of the F-DPCH code number are needed, once for each 10 common E-DCH resources. Hence, in the best configuration, only three instances would need to be present.
Therefore, this IE is various embodiments is set as conditional on value (CV) so that this IE is mandatory present for the first occurrence. Alternatively, it should be mandatory present for the first occurrence or if the default value is equal to zero. Otherwise, this IE is optional. In addition, if this IE is not present, the value is equal to the last occurrence of this IE.
If the IE is present, the signaled value overwrites the default value.
E-HICH Info
E-HICH info contains two additional IEs. Changes in this IE would imply impacts in Release 6 and Release 7 of the 3GPP standards. In order to avoid impacts in earlier versions, a new IE may be used instead: “E-HICH info for common E-DCH”. Only two IEs would be needed as this feature only applies to FDD.
E-HICH Info for Common E-DCH
Channelisation Code
This IE may be set as a conditional on value (CV) IE so that the IE is mandatory only for the first instance and optional for the rest of them. If this IE is not present, the value is equal to the last occurrence of this IE.
If the IE is present, the signaled value overwrites the default value.
Signature Sequence
The value of this IE is a number between 0 and 39. This IE in various embodiments is set as MD. If the IE is not present, “Signature sequence” takes a default value.
The default value is a function of the position of the common E-DCH resource within the list, a function the “Signature Sequence” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Signature Sequence” value of a previous common E-DCH resource instance. The first defined common E-DCH resource would occupy position 0 (or 1). The second defined common E-DCH resource would occupy position 1 (or 2). Similar reasoning would apply with the other defined resources. A concrete realization may be, for instance, if the “Signature sequence” for the first instance of the common E-DCH resource would take a default value and the rest of the common E-DCH resources would take a value function of the last instance of the IE.
For example, a simple formula is presented below to set default values for each defined common E-DCH resource in which the IE is not present.

Signature Sequence=(offset+common E-DCH resource list position)mod 40

    
    
        where “offset” is the value of the last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first instance, “offset” is equal to zero.
        “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero (or one) for the first instance.
    
    


If the IE is present, the signaled value overwrites the default value.
Uplink DPCH Code Info for Common E-DCH
Scrambling code number is a MP present value. This IE takes a relative large number of bits for each common E-DCH resource. This IE in some embodiments is changed to conditional on value (CV) instead, avoiding including such a large number of bits per configured common E-DCH resource.
Conditional on value would mean that this IE is mandatory present for the first occurrence. Otherwise, this IE is optional. In addition, if this IE is not present, the value is of the IE is a function of the last instance. For instance, it may be a function of the position of the common E-DCH resource within the list of common E-DCH resources, a function the “Uplink DPCH code info for Common E-DCH” value of a previous common E-DCH resource instance, or a function of the position of the common E-DCH resource and the “Uplink DPCH code info for Common E-DCH” value of a previous common E-DCH resource instance.
The following formula illustrates how the default values may be set if the IE is not included:

Scrambling code number=offset+common E-DCH resource list position

    
    
        where “offset” is the value of the last occurrence of the IE “Scrambling code number”. If “offset” was not present in the first instance or occurrence, “offset” is equal to zero.
        “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero (or 1) for the first instance.
    
    


If the IE is present, the signaled value overwrites the default value.
E-DPDCH Info
E-DCH Minimum Set E-TFCI
This IE is mandatory default. If this IE is missing, it means that there is no minimum E-TFCI set.
In the case of E-DCH in CELL_FACH and Idle Mode, the UE shall always send its message, especially CCCH messages. Otherwise, the UE will be blocked and, potentially, the UE will be dropped. It feels obvious that for E-DCH in CELL_FACH and Idle Mode, the E-DCH minimum set E-TFCI will be always included and it necessary must be a number above zero (E-TFCI index 0 would only let the UE to send the Scheduling Information).
Therefore, the semantic description may be modified so that for CELL_FACH and Idle Mode (or for Enhanced Uplink in CELL_FACH and Idle Mode), if the IE is not included, the E-DCH minimum set E-TFCI is set to a defined value. The only restriction for this value is that the value belongs to the set of values defined in E-TFCI table. The concrete table to be used is indicated in the IE “E-TFCI table index” included also in the IE “E-DPDCH info”. As mentioned before, E-TFCI value zero only lets the UE to transmit the Scheduling Information. Therefore, the minimum reasonable E-TFCI value so that the UE may transmit user or higher layers control data is the E-TFCI value 1.
If the IE is present, the signaled values overwrite the default value.
PRACH Preamble Control Parameters for Enhanced Uplink
Available Signatures
This is a bit string IE and each bit indicates whether a signature is used or not used. The signatures configured for RACH and included in the IE “Available Signatures” present in the IE “PRACH info (for RACH)”. These signatures cannot be used for Enhanced Uplink in CELL_FACH and Idle Mode. The IE “PRACH info (for RACH)” is included in the IE “PRACH System Information list” which is carried in SIB5. “PRACH System Information list”, “PRACH info (for RACH)” and “Available Signatures” are mandatory present IE. Hence, they will always be included in SIB5.
The IE “Available Signatures” contained in the IE “PRACH preamble control parameters for Enhanced Uplink” is also a mandatory present value; however, in embodiments herein this IE is optional and takes a default value. This default value is the same or a function of another IE, e.g., the “Available Signatures” present in the IE “PRACH info (for RACH)”.
As an example, the default value in various embodiments is a “NOT” or “INVERSE” function operation of the bit string values included in “Available Signatures” present in the IE “PRACH info (for RACH)”.
An illustrative example is presented to clarify the concept. If the value of the IE “Available Signatures” included in the IE “PRACH info (for RACH)” is: 1111111100000000, then the default value of the IE “Available Signatures” contained in the IE “Common E-DCH System Info” would be the inverse bit operation of (1111111100000000) which is equal to 0000000011111111. Therefore, the IE “available signatures” is set to mandatory default (MD) and the semantics of the description would say that the default value is the inverse bit-string indicated in the IE “Available Signature” in the IE “PRACH Info (for RACH)”. In other words, the available signatures for Enhanced Uplink in CELL_FACH are those signatures which are not used for RACH, unless the IE is present. Doing so, the base station 12 suppresses including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default value.
Preamble Scrambling Code Number
This IE is also included in the IE “PRACH info (for RACH)”. Embodiments herein teach that the scrambling code for the common E-DCH be the same as that of the RACH, at least by default. If it would be different, the new Preamble scrambling code number in various embodiments is a function of the Preamble scrambling code number present in the IE “PRACH info (for RACH)”. Hence, this IE in some embodiments is MD and by default equal to the IE “Preamble scrambling code number” indicated in the IE “PRACH info (for RACH),” and is otherwise a function of the IE “Preamble scrambling code number” indicated in the IE “PRACH info (for RACH)”.
As in the previous case, the base station 12 refrains from including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default value.
Available Sub Channel Number
This IE is a bit string. Each bit indicates availability for a sub channel, where the sub channels are numbered from “sub channel 0” to “sub channel 11”. The value 1 of a bit indicates that the corresponding sub channel is available and the value 0 indicates that it is not available.
This IE is also included in the IE “PRACH info (for RACH)”. This IE in some embodiments is also set to MD. The mandatory default value is a function of the IE “PRACH info (for RACH)”.
For example, this IE may be set equal to the IE “Available Sub Channel Number” indicated in the IE “PRACH info (for RACH)”. In another approach, the default value may be the INVERSE (or NOT) function of the IE Available Sub Channel Number indicated in the IE “PRACH info (for RACH)”
As in the previous case, the base station 12 refrains from including this IE in the IE “PRACH preamble control parameters for Enhanced Uplink” and thereby reduces downlink control signaling. A mobile terminal 18 that does not receive such an IE nevertheless sets the IE to a default value described above. If the IE is present, the signaled values overwrite the default.
Applying the encoding suggested before, the structure of the IE “PRACH preamble control parameters for Enhanced Uplink” and other IEs involved would result in shown below, affected IEs are indicated with underlined text and non-affected IEs are defined in reference to 3GPP Technical Specification (TS) 25.331 section 10 version 10.0.0:
Common E-DCH System Info

















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version





UL interference for common E-
OP

UL

REL-8


DCH


interference





10.3.6.87


Common E-DCH MAC-d flows
MP

Common E-

REL-8





DCH MAC-d





flows





10.3.5.3b


CHOICE mode
MP



REL-8


>FDD




REL-8


>>PRACH preamble control
MP

PRACH
Control parameters of
REL-8


parameters (for Enhanced


preamble
the physical signal.


Uplink)


control





parameters





(for





Enhanced





Uplink)





10.3.6.54a


>>Initial Serving grant value
MP

Integer
(0..37) indicates E-
REL-8





(0..37)
DCH serving grant






index as defined in






[15].


>>E-DCH Transmission Time
MP

Integer(2, 10)
Unit is ms.
REL-8


Interval


>>E-AGCH Info
MP

E-AGCH Info

REL-8





10.3.6.100


>>HARQ info for E-DCH
MP

HARQ info

REL-8





for E-DCH





10.3.5.7d


>>Uplink DPCH power control
MP

Uplink

REL-8


info


DPCH power





control info





for Common





E-DCH





10.3.6.91a


>>E-DPCCH info
MP

E-DPCCH

REL-8





Info





10.3.6.98


>>E-DPDCH info
MP

E-DPDCH

REL-8





info





10.3.6.99


>>F-DPCH TPC command error
MP

Real
Downlink F-DPCH
REL-8


rate target


(0.01..0.1 by
information. The





step of 0.01).
actual value of dl-






FDPCH-






TPCcommandErrorRate =






IE value * 0.01


>>Additional E-DCH
MP

Integer
In terms of TTIs.
REL-8


transmission back off


(0..15)


>>Maximum E-DCH resource
MP

Enumerated
In terms of TTIs.
REL-8


allocation for CCCH


(8, 12, 16,





24, 32, 40,





80, 120)


>>Maximum period for collision
MP

Integer
In terms of TTIs.
REL-8


resolution phase


(8..24)


>>E-DCH transmission
MP

Enumerated
In terms of TTIs. If set
REL-8


continuation back off


(0, 8, 16, 24,
to “infinity”, implicit





40, 80, 120,
common E-DCH





infinity)
resource release is






disabled.


>>ACK/NACK support on HS-
MP

Boolean
TRUE indicates that
REL-8


DPCCH



HS-DPCCH shall be






used when a common






E-DCH resource is






allocated to the UE






for DTCH/DCCH






transmission after






collision resolution.






FALSE indicates that






HS-DPCCH shall not






be used


>>Measurement Feedback Info
OP

Measurement

REL-8





Feedback





Info





10.3.6.40a


>>Common E-DCH Resource
MP
1 to


REL-8


Configuration information list

<maxEDCHs>


>>>Soffset
MD

Integer(0..9)
(0..9) indicates
REL-8






symbol offset as






defined in [26] Note3


>>>F-DPCH Code number
CV-

Integer
If this IE is not
REL-8



Short

(0..255)
present, the value is






equal to the last






occurrence of this IE.


>>>E-RGCH Information
OP

E-RGCH

REL-8





Info





10.3.6.102


>>>E-HICH info for common E-
MP

E-HICH info

REL-8


DCH


for common





E-DCH





10.3.6.1xx


>>>Uplink DPCH code info
MP

Uplink

REL-8





DPCH code





info for





Common E-





DCH





10.3.6.87b


>TDD




REL-8


>>CHOICE TDD option
MP



REL-8


>>>7.68 Mcps TDD


NULL

REL-8


>>>3.84 Mcps TDD


NULL

REL-8


>>>1.28 Mcps TDD




REL-8


>>>>E-RUCCH Info
MP

E-RUCCH

REL-8





Info 1.28





Mcps TDD





10.3.6.103a


>>>>E-PUCH info
MP

E-PUCH Info
Note1
REL-8





1.28 Mcps





TDD





10.3.6.104a


>>>>E-HICH info
MP

E-HICH info
Note1
REL-8





1.28 Mcps





TDD





10.3.6.101a


>>>>E-AGCH Info
MP

E-AGCH Info
Note1
REL-8





1.28 Mcps





TDD





10.3.6.100a


>>>>HARQ info for E-DCH
MP

HARQ info

REL-8





for E-DCH





10.3.5.7d


>>>>CCCH transmission info
MP


Note2
REL-8


>>>>>Common E-RNTI info
MP

Common E-

REL-8





RNTI info





10.3.3.7a


>>>>>HARQ maximum number
MP

Integer (0..7)

REL-8


of retransmissions


>>>>>HARQ retransmission
MP

Enumerated
Unit: ms
REL-8


timer


(10, 15, 20,





25, 30, 35,





40, 45, 50,





55, 60, 65,





70, 75, 80,





85, 90, 95,





100, 110,





120, 140,





160)


>>>>>HARQ power offset
MP

Integer(0..6)

REL-8













Condition
Explanation







Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.







Note1: These IEs correspond to the HS-DSCH configuration for CELL_FACH, CELL_PCH and URA_PCH state on primary frequency, the configuration on secondary frequency is signalled to UE via dedicated signalling.



Note2: These IEs correspond to CCCH transmission configuration for CELL_FACH state on the primary frequency and secondary frequency.



Note3: The default value is defined by: Soffset = (offset + common E-DCH resource list position) mod 10 where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






E-DPDCH Info















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







E-TFCI table index
MP

Integer (0..1)
Indicates which
REL-6






standardised E-






TFCI TB size






table shall be






used. See Note






3.


E-DCH minimum set E-TFCI
MD

Integer
See [15];
REL-6





(0..127)
Absence means






no E-DCH






minimum set.






In CELL FACH






and Idle Mode,






the default value






is 1.


Reference E-TFCIs
MP
1 to 8

See [29]
REL-6


>Reference E-TFCI
MP

Integer

REL-6





(0..127)


>Reference E-TFCI PO
MP

Integer (0..29,
Refer to
REL-6






quantization of






the power offset






in [28]





30, 31)
Values 30 and
REL-7






31 are only used






for E-TFCI >






ETFCI Boost


Minimum reduced E-DPDCH
OP

Enumerated
βed,k,reduced,min
REL-8


gain factor


(8/15, 11/15,
[29]; the default





15/15, 21/15,
value is 8/15. If





30/15, 42/15,
the configurable





60/15, 84/15)
reduced E-






DPDCH gain






factor is not






supported by the






UE, the default






value is used.


Maximum channelisation codes
MP

Enumerated

REL-6





(sf256, sf128,





sf64, sf32,





sf16, sf8, sf4,





2sf4, 2sf2,





2sf2and2sf4)


PLnon-max
MP

Real (0.44..1.0
As defined in
REL-6





by step of
[27]





0.04)


Scheduling Information
MP



REL-6


Configuration


>Periodicity for Scheduling Info -
MD

Enumerated
Values in ms.
REL-6


no grant


(everyEDCHTTI,
Default value is





4, 10, 20, 50,
“no report”





100, 200, 500, 1000)
NOTE 1.


>Periodicity for Scheduling Info -
MD

Enumerated
Values in ms.
REL-6


grant


(everyEDCHTTI,
Default value is





4, 10, 20, 50,
“no report”





100, 200, 500, 1000)
NOTE 1.


>Power Offset for Scheduling
MP

Integer (0..6)
Only used when
REL-6


Info



no MACd PDUs






are included in






the same MACe






PDU. Unit is in






dB.


3-Index-Step Threshold
MD

Integer (0..37)
Refers to an
REL-6






index in the






“SG-Table” (see






[15]).






Default value is






0. NOTES






2, 3.


2-Index-Step Threshold
MD

Integer (0..37)
Refers to an
REL-6






index in the






“SG-Table” (see






[15]).






Default value is






0. NOTES






2, 3.





NOTE 1: If the Periodicity is set to 4 ms and the E-DCH TTI is set to 10 ms, the UE shall interpret the periodicity value as 10 ms.


NOTE 2: If the 3-index-Step Threshold value is greater than 2-index-Step Threshold, the UE behaviour is unspecified.


NOTE 3: If the UE is operating in 16QAM mode, the value of “E-TFCI table index” is increased by 2, and indices in the SG-Table refer to Scheduling Grant Table 2 in [15].






E-HICH Info for Common E-DCH

















Information







Element/


Type and
Semantics



Group name
Need
Multi
reference
description
Version





Channelisation
CV-

Integer
If this IE is not
REL-8


Code
Short

(0..127)
present, the value






is equal to the last






occurrence of this






IE.


Signature
MD

Integer
Note1
REL-8


Sequence


(0..39)













Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.







Note1: The default value is defined by: Signature Sequence = (offset + common E-DCH resource list position) mod 40 where “offset” is the value of the last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first occurrence, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






Uplink DPCH Code Info for Common E-DCH

















Information







Element/


Type and
Semantics


Group name
Need
Multi
reference
description
Version





Scrambling code
MP

Enumerated

REL-8


type


(short, long)


Scrambling code
CV-

Integer
Note1
REL-8


number
Short

(0..16777215)













Condition
Explanation







Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.







Note1: If this IE is not included, the value is given by: Scrambling code number = offset + common E-DCH resource list position where “offset” is the value of the last occurrence of the IE “scrambling code number”. If the IE “scrambling code number” is not present in the first occurrence, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






As stated above the mobile terminal 10 may derive access request preambles for the one CB channel, e.g., the non-legacy CB channel, such as the E-DCH, based on or as a function of directly indicated access request preambles for another CB channel, e.g. the legacy channel such as the RACH. The changed IEs are indicated with underlined text:
PRACH Preamble Control Parameters (for Enhanced Uplink)















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







Available Signature
MD

Bit string(16)
The default value is
REL-8






the inverse bitstring






indicated in the IE






“Available Signature”






in the IE “PRACH Info






(for RACH)”.






Each bit indicates






availability for a






signature.






Each available






signature on the






AICH is associated






with one Common E-






DCH Resource






Configuration in the






“Common E-DCH






resource






configuration






information list”.


E-AI Indication
MP

BOOLEAN
TRUE: E-AIs are in
REL-8






use on the AICH.






FALSE: E-AIs are not






in use on the AICH.


Preamble scrambling code
MD

Integer (0..15)
The default value is
REL-8


number



the value indicated in






the IE “Preamble






scrambling code






number” in the IE






“PRACH Info (for






RACH)”.






Identification of






scrambling code, see






[28]


Available Sub Channel Number
MD

Bit string(12)
The default value is
REL-8






the same value






indicated in the IE






“Available Signatures”






in the IE “PRACH






system information






list”.






Each bit indicates






availability for a






subchannel, where






the subchannels are






numbered






“subchannel 0” to






“subchannel 11”. The






value 1 of a bit






indicates that the






corresponding






subchannel is






available and the






value 0 indicates that






it is not available.


PRACH partitioning
MD

PRACH
Default value is the
REL-8





partitioning
value of “PRACH





10.3.6.53
partitioning” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


Persistence scaling factors
OP

Persistence
This IE shall not be
REL-8





scaling
present if only ASC 0





factors
and ASC 1 are





10.3.6.48
defined. If this IE is






absent, default value






is the value of






“Persistence scaling






factors” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis, if






value exists


AC-to-ASC mapping
MD

AC-to-ASC
Default value is the
REL-8





mapping
value of “AC-to-ASC





10.3.6.1
mapping” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


Primary CPICH TX power
MD

Primary
Default value is the
REL-8





CPICH TX
value of “Primary





power
CPICH TX power” in





10.3.6.61
the first occurrence in






list “PRACH system






information list” in






SIB5 or SIB5bis.


Constant value
MD

Constant
Default value is the
REL-8





value
value of “Constant





10.3.6.11
value” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis


PRACH power offset
MD

PRACH
Default value is the
REL-8





power offset
value of “PRACH





10.3.6.54
power offset” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis


PRACH transmission
MD

RACH
Default value is the
REL-8


parameters


transmission
value of “RACH





parameters
transmission





10.3.6.67
parameters” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


AICH info
MD

AICH info
Default value is the
REL-8





10.3.6.2
value of “AICH info” in






the first occurrence in






list “PRACH system






information list” in






SIB5 or SIB5bis.


Power offset Pp-e
MP

Integer(−5..10)
In dB. Power offset
REL-8






between the last






transmitted preamble






and the initial DPCCH






transmission as






defined in [26]









The encoding code, e.g. ASN 1 code, may be updated as it follows only relevant IEs have been added:













SysInfoType5 ::=
SEQUENCE {








  sib6indicator
BOOLEAN,


 -- Physical channel IEs


  pich-PowerOffset
PICH-PowerOffset,


  modeSpecificInfo
CHOICE {








   fdd
SEQUENCE {








    aich-PowerOffset
AICH-PowerOffset


   },








   tdd
SEQUENCE {







 -- If PDSCH/PUSCH is configured for 1.28Mcps or 7.68Mcps TDD, the following IEs should


be absent


 -- and the info included in the respective tdd128SpecificInfo or tdd768SpecificInfo


instead.


 -- If PDSCH/PUSCH is configured for 3.84Mcps TDD in R5, HCR-r5-SpecificInfo should also


be


 -- included.









    pusch-SysInfoList-SFN
PUSCH-SysInfoList-SFN
OPTIONAL,


    pdsch-SysInfoList-SFN
PDSCH-SysInfoList-SFN
OPTIONAL,


    openLoopPowerControl-TDD
OpenLoopPowerControl-TDD


   }


  },









  primaryCCPCH-Info
PrimaryCCPCH-Info
OPTIONAL,


  prach-SystemInformationList
PRACH-SystemInformationList,


  sCCPCH-SystemInformationList
SCCPCH-SystemInformationList,







  -- cbs-DRX-Level1Information is conditional on any of the CTCH indicator IEs in


  -- sCCPCH-SystemInformationList









  cbs-DRX-Level1Information
CBS-DRX-Level1Information
OPTIONAL,







 -- Extension mechanism for non- release99 information








  v4b0NonCriticalExtensions  SEQUENCE {



   sysInfoType5-v4b0ext    SysInfoType5-v4b0ext-IEs
OPTIONAL,







  -- Extension mechanism for non- rel-4 information


   v590NonCriticalExtensions  SEQUENCE {








    sysInfoType5-v590ext    SysInfoType5-v590ext-IEs
OPTIONAL,


    v650NonCriticalExtensions  SEQUENCE {


     sysInfoType5-v650ext    SysInfoType5-v650ext-IEs


 OPTIONAL,


     v680NonCriticalExtensions  SEQUENCE {


      sysInfoType5-v680ext    SysInfoType5-v680ext-IEs


 OPTIONAL,


      v690NonCriticalExtensions  SEQUENCE {


       sysInfoType5-v690ext    SysInfoType5-v690ext-IEs,


       v770NonCriticalExtensions  SEQUENCE {


        sysInfoType5-v770ext    SysInfoType5-v770ext-IEs,


        v860NonCriticalExtensions  SEQUENCE {


         sysInfoType5-v860ext    SysInfoType5-v860ext-


IEs,


         v890NonCriticalExtensions  SEQUENCE {


          sysInfoType5-v890ext    SysInfoType5-


v890ext-IEs,


          v8b0NonCriticalExtensions  SEQUENCE {


           sysInfoType5-v8b0ext









SysInfoType5-







v8b0ext-IEs,


           v8c0NonCriticalExtensions  SEQUENCE {


            sysInfoType5-v8c0ext


            nonCriticalExtensions   SEQUENCE { }  OPTIONAL


           }  OPTIONAL


          }  OPTIONAL


         }  OPTIONAL


        }  OPTIONAL


       }  OPTIONAL


      }  OPTIONAL


     }  OPTIONAL


    }  OPTIONAL


   }  OPTIONAL


  }  OPTIONAL


}


SysInfoType5-v890ext-IEs ::= SEQUENCE {









 secondFrequencyInfo
FrequencyInfoTDD
OPTIONAL,







 -- The field ‘dummy’ shall be marked absent in SysInfoType5 and SysInfoType5bis. A


failure to


 -- comply with this requirement may prevent the UE to receive any service in the cell.


The UE


 -- may treat the cell as barred.









 dummy
SEQUENCE { }
OPTIONAL


}







SysInfoType5-v8c0ext-IEs ::= SEQUENCE {









 commonEDCHSystemInfo
CommonEDCHSystemInfo
OPTIONAL


}







PRACH-PreambleForEnhancedUplink ::= SEQUENCE {









 availableSignatures
AvailableSignatures
OPTIONAL,


 e-ai-Indication
BOOLEAN,


 preambleScramblingCodeWordNumber
PreambleScramblingCodeWordNumber
OPTIONAL,


 availableSubChannelNumbers
AvailableSubChannelNumbers
OPTIONAL,


 prach-Partitioning
PRACH-Partitioning-r7
OPTIONAL,


 persistenceScalingFactorList
PersistenceScalingFactorList
OPTIONAL,


 ac-To-ASC-MappingTable
AC-To-ASC-MappingTable
OPTIONAL,


 primaryCPICH-TX-Power
PrimaryCPICH-TX-Power
OPTIONAL,


 constantValue
ConstantValue
OPTIONAL,


 prach-PowerOffset
PRACH-PowerOffset
OPTIONAL,


 rach-TransmissionParameters
RACH-TransmissionParameters
OPTIONAL,


 aich-Info
AICH-Info
OPTIONAL,


 powerOffsetPp-e
INTEGER (−5..10)


}







Common-E-DCH-ResourceInfoList ::= SEQUENCE {









 s-offset
INTEGER (0..9)
OPTIONAL,


 f-dpch-ChannelisationCodeNumber
INTEGER (0..255)
OPTIONAL,


 e-RGCH-Information
E-RGCH-Information
OPTIONAL,


 e-hich-Info
E-HICH-Information-CommonEdch,


 ul-DPCH-CodeInfoForCommonEDCH
UL-DPCH-CodeInfoForCommonEDCH


}







UL-DPCH-CodeInfoForCommonEDCH ::= SEQUENCE {









 ul-DPCCHscramblingCodeType
ScramblingCodeType,



 ul-DPCCHscramblingCode
UL-ScramblingCode
OPTIONAL


}


E-HICH-Information-CommonEdch ::=
SEQUENCE {


 channelisationCode
E-HICH-ChannelisationCode


 OPTIONAL,


 signatureSequence
E-HICH-RGCH-SignatureSequence


 OPTIONAL


}









In some embodiments, a second approach may be taken to provide a backward 55 compatible solution.
In this case a new IE needs to be added in SIB5, “Common E-DCH System Info Short”, for instance. This new IE may comprise the new encoding.
The tabular of SIB5 would be as follows:
System Information Block Type 5 and 5bis















Information


Type and




Element/Group name
Need
Multi
reference
Semantics description
Version







SIB6 Indicator
MP

Boolean
TRUE indicates that







SIB6 is broadcast in the






cell.






When the UE receives






SIB5 in the System






Information Container






message, this IE is






interpreted as FALSE


PhyCH information


elements


PICH Power offset
MP

PICH
If the cell is operating in





Power
MBSFN mode as





offset
indicated in subclause





10.3.6.50
8.1.1.6.3 the UE






behaves as if this IE






would not have been






received.


CHOICE mode
MP


>FDD


>>AICH Power offset
MP

AICH
If the cell is operating in





Power
MBSFN mode as





offset
indicated in subclause





10.3.6.3
8.1.1.6.3 the UE






behaves as if this IE






would not have been






received.


>TDD


>>PUSCH system
OP

PUSCH
If the cell is operating in


information


system
MBSFN mode as





information
indicated in subclause





10.3.6.66
8.1.1.6.3 the UE






behaviour upon






reception of this IE is






unspecified.


>>PUSCH system
OP

PUSCH
Only for 7.68 Mcps TDD
REL-7


information VHCR


system
If the cell is operating in





information
MBSFN mode as





VHCR
indicated in subclause





10.3.6.66a
8.1.1.6.3 the UE






behaviour upon






reception of this IE is






unspecified.


>>PDSCH system
OP

PDSCH
If the cell is operating in


information


system
MBSFN mode as





information
indicated in subclause





10.3.6.46
8.1.1.6.3 the UE






behaviour upon






reception of this IE is






unspecified.


>>TDD open loop power
MP

TDD open
If the cell is operating in


control


loop
MBSFN mode as





power
indicated in subclause





control
8.1.1.6.3 the UE





10.3.6.79
behaves as if this IE






would not have been






received.


Primary CCPCH info
OP

Primary
Note 1





CCPCH





info





10.3.6.57


PRACH system
MP

PRACH
If the cell is operating in


information list


system
MBSFN mode as





information
indicated in subclause





list
8.1.1.6.3 the UE





10.3.6.55
behaves as if this IE






would not have been






received.


Common E-DCH system
OP

Common

REL-8


info


E-DCH





system





info





10.3.6.9a


Common E-DCH system
OP

Common

REL-8


info short


E-DCH





system





info short





10.3.6.9b


Secondary CCPCH
MP

Secondary
Note 2


system information


CCPCH
If the cell is operating in





system
MBSFN mode as





information
indicated in subclause





10.3.6.72
8.1.1.6.3 the UE






behaves as if this IE






would not have been






received.


CBS DRX Level 1
CV-

CBS DRX


information
CTCH

Level 1





information





10.3.8.3


Frequency band indicator
OP

Frequency

REL-6





band





indicator





10.3.6.35b


Frequency band indicator 2
OP

Frequency

REL-6





band





indicator 2





10.3.6.35c


HSDPA cell Indicator
MD

Enumerated
Default is ‘HSDPA
REL-6





(HSDPA
capability not indicated’.





Capable
‘HSDPA Capable Cell’





Cell)
means that the UE may






consider this cell as part






of the HSDPA coverage






area for display






indication only.






This indication shall not






be used for any other






purpose.






If the cell is operating in






MBSFN mode as






indicated in subclause






8.1.1.6.3 the UE






behaves as if this IE






would not have been






received.


E-DCH cell Indicator
MD

Enumerated
Default is ‘E-DCH
REL-6





(E-
capability not indicated’.





DCH
‘E-DCH Capable Cell’





Capable
means that the UE may





Cell)
consider this cell as part






of the E-DCH coverage






area for display






indication only.






This indication shall not






be used for any other






purpose.






If the cell is operating in






MBSFN mode as






indicated in subclause






8.1.1.6.3 the UE






behaves as if this IE






would not have been






received.


Secondary CCPCH
OP

Secondary
Included if MCCH is on
REL-6


system information


CCPCH
an S-CCPCH used only


MBMS


system
for MBMS. Note 2





information





MBMS





10.3.6.72a


CHOICE mode
OP



REL-7


>FDD




REL-7


>>HS-DSCH common
MP

HS-DSCH
Included if cell supports
REL-7


system information


common
HS-DSCH reception in





system
CELL_FACH and





information
during IDLE to RRC





10.3.6.36c
Connection state






transition.


>>HS-DSCH paging
OP

HS-DSCH
Included if cell supports
REL-7


system information


paging
for UEs in RRC





system
Connected state paging





information
message reception on





10.3.6.36d
HS-DSCH.


>TDD




REL-7


>>HS-DSCH common
MP

HS-DSCH
Included if cell supports
REL-8


system information


common
HS-DSCH reception in





system
CELL_FACH and





information
during IDLE to RRC





1.28Mcps
Connection state





TDD
transition.





10.3.6.36ca


>>HS-DSCH paging
OP

HS-DSCH
Included if cell supports
REL-8


system information


paging
for UEs in RRC





system
Connected state paging





information
message reception on





1.28Mcps
HS-DSCH.





TDD





10.3.6.36da


TDD MBSFN information
OP

TDD
TDD only: included only
REL-7





MBSFN
if some timeslots are





Information
designated to MBSFN.





10.3.6.78b


HS-DSCH DRX in
OP

HS-DSCH

REL-8


CELL_FACH Information


DRX in





CELL_FACH





Information





10.3.6.36g


HS-DSCH DRX in
OP

HS-DSCH

REL-8


CELL_FACH Information


DRX in


1.28 Mcps TDD


CELL_FACH





Information





1.28





Mcps





TDD





10.3.6.36h


Second Frequency info
OP

Integer (0..16383)
Note 3
REL-8


Treset Usage Indicator
OP

Enumerated
Only for 1.28 Mcps
REL-8





(TRUE)
TDD. The presence of






this IE means the timer






Treset is not valid when






the dedicated H-RNTI is






configured in






CELL_FACH and






CELL_PCH.


UpPCH Position Info
CV-

Integer (0..127)
Only for 1.28 Mcps
REL-8



Frequency


TDD.









The new IE may then be defined as follows:
Common E-DCH System Info Short

















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version





UL interference for common E-
CV-

UL

REL-8


DCH
Optional

interference





10.3.6.87


Common E-DCH MAC-d flows
CV-

Common E-

REL-8



Mandatory

DCH MAC-d





flows





10.3.5.3b


PRACH preamble control
CV-

PRACH
Control parameters of
REL-8


parameters (for Enhanced
Mandatory

preamble
the physical signal.


Uplink)


control





parameters





(for





Enhanced





Uplink)





10.3.6.54a


Initial Serving grant value
CV-

Integer
(0..37) indicates E-
REL-8



Mandatory

(0..37)
DCH serving grant






index as defined in






[15].


E-DCH Transmission Time
CV-

Integer(2, 10)
Unit is ms.
REL-8


Interval
Mandatory


E-AGCH Info
CV-

E-AGCH Info

REL-8



Mandatory

10.3.6.100


HARQ info for E-DCH
CV-

HARQ info

REL-8



Mandatory

for E-DCH





10.3.5.7d


Uplink DPCH power control info
CV-

Uplink

REL-8



Mandatory

DPCH power





control info





for Common





E-DCH





10.3.6.91a


E-DPCCH info
CV-

E-DPCCH

REL-8



Mandatory

Info





10.3.6.98


E-DPDCH info
CV-

E-DPDCH

REL-8



Mandatory

info





10.3.6.99


F-DPCH TPC command error
CV-

Real
Downlink F-DPCH
REL-8


rate target
Mandatory

(0.01..0.1 by
information. The





step of 0.01).
actual value of dl-






FDPCH-






TPCcommandErrorRate =






IE value * 0.01


Additional E-DCH transmission
CV-

Integer
In terms of TTIs.
REL-8


back off
Mandatory

(0..15)


Maximum E-DCH resource
CV-

Enumerated
In terms of TTIs.
REL-8


allocation for CCCH
Mandatory

(8, 12, 16,





20, 24, 32,





40, 80)


Maximum period for collision
CV-

Integer
In terms of TTIs.
REL-8


resolution phase
Mandatory

(8..24)


E-DCH transmission
CV-

Enumerated
In terms of TTIs. If set
REL-8


continuation back off
Mandatory

(0, 4, 8, 16,
to “infinity”, implicit





24, 40, 80,
common E-DCH





infinity)
resource release is






disabled.


ACK/NACK support on HS-
CV-

Boolean
TRUE indicates that
REL-8


DPCCH
Mandatory


HS-DPCCH shall be






used when a common






E-DCH resource is






allocated to the UE






for DTCH/DCCH






transmission after






collision resolution.






FALSE indicates that






HS-DPCCH shall not






be used


Measurement Feedback Info
CV-

Measurement

REL-8



Optional

Feedback





Info





10.3.6.40a


Common E-DCH Resource
MP
1 to


REL-8


Configuration information list

<maxEDCHs>


>Soffset
MD

Integer(0..9)
(0..9) indicates
REL-8






symbol offset as






defined in [26] Note3


>F-DPCH Code number
CV-

Integer
If this IE is not
REL-8



Short

(0..255)
present, the value is






equal to the last






occurrence of this IE.


>E-RGCH Information
CV-

E-RGCH

REL-8



Short

Info





10.3.6.102


>E-HICH info for common E-
MD

E-HICH info

REL-8


DCH


for common





E-DCH





10.3.6.1xx


>Uplink DPCH code info
MD

Uplink

REL-8





DPCH code





info for





Common E-





DCH





10.3.6.87b













Condition
Explanation







Optional
If the IE “Common E-DCH System Info” is present,




the value of the IE is the same value of corresponding




IE in the IE “Common E-DCH system info”.




Otherwise, this IE is optional.



Short
This IE is mandatory present for the first occurrence.




Otherwise, this IE is optional.



Mandatory
If the IE “Common E-DCH System Info” is present,




the value of the IE is the same value of the




corresponding IE in the IE “Common E-DCH System




Info”. Otherwise, this IE is mandarory present.







Note: Only for FDD.



Note1: These IEs correspond to the HS-DSCH configuration for CELL_FACH, CELL_PCH and URA_PCH state on primary frequency, the configuration on secondary frequency is signalled to UE via dedicated signalling.



Note2: These IEs correspond to CCCH transmission configuration for CELL_FACH state on the primary frequency and secondary frequency.



Note3: The default value is defined by: Soffset = (offset + common E-DCH resource list position) mod 10 where “offset” is the value of the last instance of the IE “Soffset”. If the IE “Soffset” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






Additional conditions may be placed in other to reduce the signalling in case the IE “Common E-DCH System Info” is included. The affected IEs are underlined below:
PRACH Preamble Control Parameters (for Enhanced Uplink)















Information Element/Group


Type and
Semantics



name
Need
Multi
reference
description
Version







Available Signature
MD

Bit string(16)
The default value is
REL-8






the inverse bitstring






indicated in the IE






“Available Signature”






in the IE “PRACH Info






(for RACH)”.






Each bit indicates






availability for a






signature.






Each available






signature on the






AICH is associated






with one Common E-






DCH Resource






Configuration in the






“Common E-DCH






resource






configuration






information list”.


E-AI Indication
MP

BOOLEAN
TRUE: E-AIs are in
REL-8






use on the AICH.






FALSE: E-AIs are not






in use on the AICH.


Preamble scrambling code
MD

Integer (0..15)
The default value is
REL-8


number



the value indicated in






the IE “Preamble






scrambling code






number” in the IE






“PRACH Info (for






RACH)”.






Identification of






scrambling code, see






[28]


Available Sub Channel Number
MD

Bit string(12)
The default value is
REL-8






the same value






indicated in the IE






“Available Signatures”






in the IE “PRACH






system information






list”.






Each bit indicates






availability for a






subchannel, where






the subchannels are






numbered






“subchannel 0” to






“subchannel 11”. The






value 1 of a bit






indicates that the






corresponding






subchannel is






available and the






value 0 indicates that






it is not available.


PRACH partitioning
MD

PRACH
Default value is the
REL-8





partitioning
value of “PRACH





10.3.6.53
partitioning” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


Persistence scaling factors
OP

Persistence
This IE shall not be
REL-8





scaling
present if only ASC 0





factors
and ASC 1 are





10.3.6.48
defined. If this IE is






absent, default value






is the value of






“Persistence scaling






factors” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis, if






value exists


AC-to-ASC mapping
MD

AC-to-ASC
Default value is the
REL-8





mapping
value of “AC-to-ASC





10.3.6.1
mapping” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


Primary CPICH TX power
MD

Primary
Default value is the
REL-8





CPICH TX
value of “Primary





power
CPICH TX power” in





10.3.6.61
the first occurrence in






list “PRACH system






information list” in






SIB5 or SIB5bis.


Constant value
MD

Constant
Default value is the
REL-8





value
value of “Constant





10.3.6.11
value” in the first






occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis


PRACH power offset
MD

PRACH
Default value is the
REL-8





power offset
value of “PRACH





10.3.6.54
power offset” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis


PRACH transmission
MD

RACH
Default value is the
REL-8


parameters


transmission
value of “RACH





parameters
transmission





10.3.6.67
parameters” in the






first occurrence in list






“PRACH system






information list” in






SIB5 or SIB5bis.


AICH info
MD

AICH info
Default value is the
REL-8





10.3.6.2
value of “AICH info” in






the first occurrence in






list “PRACH system






information list” in






SIB5 or SIB5bis.


Power offset Pp-e
MP

Integer(−5..10)
In dB. Power offset
REL-8






between the last






transmitted preamble






and the initial DPCCH






transmission as






defined in [26]









E-HICH Info Common for E-DCH


















Information







Element/


Type and
Semantics


Group name
Need
Multi
reference
description
Version





Channelisation
CV-

Integer
For the first
REL-8


Code
Short

(0..127)
occurrence, if this






IE is not present,






the value of this IE






is the value of last






occurrence of the






IE “Channelisation






Code” present in






the IE “Common






E-DCH system






info”.






For subsequent






occurecences, if






the IE is not






present, the value






is equal to the last






occurence of this






IE.


Signature
MD

Integer
Note1
REL-8


Sequence


(0..39)













Short
If the IE “Common E-DCH system info” is not present,




this IE is mandatory present for the first occurrence.




Otherwise, this IE is optional,







NOTE1: The default value is defined by: Signature Sequence = (offset + common E-DCH resource list position) mod 40 where “offset” is the value of last occurrence of the IE “Signature Sequence”. If “Signature Sequence” was not present in the first instance, “offset” is equal to zero. “common E-DCH resource list position” indicates the Common E-DCH resource Configuration Information number by order of appearance. The value of the “common E-DCH resource list position” is zero for the first instance.






The IEs “E-DPCH info” and “Uplink DPCH code info for Common E-DCH” would not be changed compared with the first solution.
The encoding improvement of each IE present in “Common E-DCH System Info” are independent from other IEs.
Step 503.
The mobile terminal 10 transmits an access request preamble mapped to the second available resource. Thus, the mobile terminal 10 requests access to the wireless communication system. In some embodiments the mobile terminal randomly selects the access request preamble. Furthermore, the mobile terminal 10 may, when receiving an acknowledgement of the transmitted access request preamble, transmit uplink data on the contention based channel using the second available resource.
The processing at the mobile terminal 10 may additionally include receiving system information that directly indicates the access request preambles for a first contention-based uplink channel. Processing continues to deriving the access request preambles for a second contention-based uplink channel based on or as a function of the directly indicated preambles. In one or more embodiments, processing further includes randomly selecting one of the derived access request preambles, and then transmitting the selected preamble to request access to the second contention-based uplink channel.
FIG. 6 is a block diagram depicting the mobile terminal 10 according to embodiments herein. The mobile terminal 10 is configured to generally perform the method illustrated in FIG. 5. The mobile terminal 10 may include one or more transmit/receive antennas 601, along with associated transmitter (TX) circuit 602 and receiver (RX) circuit 603, respectively, and includes one or more processing circuits 604. The RX circuit 603 is configured to receive from the base station 12, via the receive antennas 601, broadcasted system information that indicates a first available resource of a CB channel. The processing circuit 604 of the mobile terminal 10 may be configured to then derive information for a second available resource of the CB channel based on or as a function of the first. This may entail, for instance, deriving information for the second available resource according to a pre-determined rule that defines the second resource as a function of the first resource, e.g. as a function of the first resource's position within an ordered list describing the resources. The processing circuit 604 may optionally in some embodiments randomly select an access request preamble corresponding to a second available resource of a contention-based uplink channel. The TX circuit 602 may then transmit selected preamble, and the RX circuit 603 may receive a positive acknowledgement. Whether or not performed responsive to the transmitted selected preamble, the processing circuit 604 may derive system information for a second available resource of the second contention-based channel, e.g. uplink channel, based on or as a function of the first available resource. Finally, TX circuit 602 may in various embodiments conclude with transmitting uplink data on the second contention-based uplink channel using the second available resource.
In some embodiments, the system information received may directly indicate the access request preambles for one channel, e.g., the legacy CB channel such as a RACH. The processing circuits 604 may then be configured to derive the access request preambles for the other channel, e.g., the non-legacy CB channel, such as an E-DCH, based on or as a function of the directly indicated preambles. In some embodiments, the processing circuits 604 are further configured to randomly select from amongst the derived access request preambles, whereupon the TX circuit 602 is configured to transmit the selected preamble to the base station 12, in order to request access to the associated CB channel.
In FIG. 6, the mobile terminal receives system information that indicates a first available resource of the second contention-based uplink channel. In some embodiments the processing circuit may optionally include randomly select an access request preamble corresponding to a second available resource of the second contention-based uplink channel, transmitting the selected preamble, and receiving a positive acknowledgement. The processing circuit 604 then derives system information for a second available resource of the second contention-based uplink channel based on or as a function of the first available resource. Finally, processing circuit 604 may in various embodiments conclude with transmitting uplink data on the second contention-based uplink channel using the second available resource via the TX circuit 602.
Thus, the mobile terminal 10 for requesting access to the wireless communication system comprises the receiver circuit 603 configured to receive broadcasted system information that indicates the first available resource of the contention based channel. The mobile terminal 10 further comprises the processing circuit 604 configured to derive the second available resource of the contention based channel based on the first available resource of the contention based channel. The processing circuit 604 may further be configured to transmit an access request preamble mapped to the second available resource. The processing circuit 604 is in some embodiments further configured to randomly select the access request preamble. Furthermore, the processing circuit 604 may be further configured to, when receiving an acknowledgement of the transmitted access request preamble, transmit uplink data on the contention based channel using the second available resource. In some embodiments the contention based channel corresponds to a random access channel, RACH, or a common Enhanced Dedicated Channel, E-DCH. The received broadcasted system information may be comprised in a System Information Block type 5, SIB5. The second available resource may be indicated in the ordered list of resources as a function of a position of the first available resource in the ordered list. In some embodiments the ordered list is defining common Enhanced-Dedicated Channel, E-DCH, resources. Each E-DCH Resource may be defined by an Soffset information element, an Fractional Dedicated Physical Control Channel, F-DPCH, code number information element, and an E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel, E-HICH, info for common E-DCH information element. In some embodiments the position of the second available resource in the ordered list is defined by a default value in the Soffset information element. The default value is a function of the position of the second available resource within the ordered list; a function of a “Soffset” value of a previous first available resource; or a function of the position of the second available resource and an offset value. The offset value being an Soffset value of the first available resource. In some embodiments the F-DPCH code number information element may be the same for a maximum of ten common E-DCH resources. The E-HICH info for common E-DCH information element is in some embodiments defined by a channelization code and a signature sequence. A default value of the signature sequence is a function of the position of the second available resource within the ordered list; a function of a “Signature Sequence” value of a previous first available resource; or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource. A channelization code of the second available resource may be equal to a channelization code of the first available resource. The second available resource may be defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, which value is a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.
Those skilled in the art will also appreciate that the various “circuits” described may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g., stored in memory, that, when executed by the one or more processors, perform as described above. One or more of these processors, as well as the other digital hardware, may be included in a single application-specific integrated circuit (ASIC), or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip (SoC).
Thus, those skilled in the art will appreciate that the foregoing description and the accompanying drawings represent non-limiting examples of the methods and apparatuses taught herein. As such, the present invention is not limited by the foregoing description and accompanying drawings.

## Claims

1. A method in a mobile terminal for requesting access to a wireless communication system, comprising:
receiving broadcasted system information that indicates a first available resource of a contention based channel, wherein the contention based channel is an Enhanced Dedicated Channel (E-DCH);
deriving a second available resource of the same contention based channel based on the first available resource of the contention based channel; and
transmitting an access request preamble mapped to the second available resource to access the wireless communication system;
wherein each E-DCH resource is defined by a Fractional Dedicated Physical Control Channel (F-DPCH) code number information element, an “E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH) info for common E-DCH” information element, and a Soffset information element that indicates a slot within the F-DPCH in which power control commands are included for the F-DPCH code number; and
wherein if a Soffset information element is not received for the second available resource, the mobile terminal determines a default Soffset value for the second available resource as function of an Soffset value received for the first available resource.

2. The method of claim 1, wherein the transmitting comprises randomly selecting the access request preambles.

3. The method of claim 1, wherein the transmitting comprises, when receiving an acknowledgement of the transmitted access request preamble, transmitting uplink data on the contention based channel using the second available resource.

4. The method of claim 1, wherein the received broadcasted system information is included in a System Information Block type 5 (SIB5).

5. The method of claim 1, wherein the second available resource is indicated in an ordered list of resources as a function of the first available resource in the ordered list.

6. The method of claim 5, wherein if a Soffset information element is not received for the second available resource, the mobile terminal determines the default Soffset value for the second available resource according to the following equation:


Soffset=(offset+common E-DCH resource list position)mod 10


where:
“offset” is the value of the Soffset information element in the broadcasted system information that indicates the first available resource, and if the Soffset information was not present in the broadcasted system information that indicates the first available resource then the offset is set to zero; and
“common E-DCH resource list position” indicates a position of the second available resource in the ordered list.

7. The method of claim 6, wherein the F-DPCH code number information element is the same for a maximum of ten common E-DCH resources.

8. The method of claim 6, wherein the “E-HICH info for common E-DCH” information element is defined by a channelization code and a signature sequence, and wherein a default value of the signature sequence is a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource.

9. The method of claim 8, wherein a channelization code of the second available resource is equal to a channelization code of the first available resource.

10. The method of claim 6, wherein the second available resource is further defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, with the value being a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource, or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.

11. A method in a base station for managing access to a wireless communications network, the method comprising:
encoding system information indicating a second available resource of a contention based channel relative to a first available resource of the same contention based channel, wherein the contention based channel is an Enhanced Dedicated Channel (E-DCH); and
broadcasting the encoded system information;
wherein each E-DCH resource is defined by a Fractional Dedicated Physical Control Channel (F-DPCH) code number information element, an “E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH) info for common E-DCH” information element, and a Soffset information element that indicates a slot within the F-DPCH in which power control commands are included for the F-DPCH code number;
the method further comprises instructing a mobile terminal to determine a default Soffset value for the second available resource as function of an Soffset value of the first available resource by omitting the Soffset information element for the second available resource in the encoded system information.

12. The method of claim 11, wherein the system information is included in a System Information Block type 5 (SIB5).

13. The method of claim 11, wherein the second available resource is indicated in an ordered list of resources as a function of the first available resource in the ordered list.

14. The method of claim 13, wherein said instructing the mobile terminal to determine a default Soffset value for the second available resource comprises causing the mobile terminal to determine the default Soffset value according to the following equation:


Soffset=(offset+common E-DCH resource list position)mod 10


where:
“offset” is the value of the Soffset information element in the encoded system information, and if the Soffset information is not present in the encoded system information then the offset is considered to be zero; and
“common E-DCH resource list position” indicates a position of the second available resource in the ordered list.

15. The method of claim 13, wherein the F-DPCH code number information element is the same for a maximum of ten common E-DCH resources.

16. The method of claim 13, wherein the “E-HICH info for common E-DCH” information element is defined by a channelization code and a signature sequence, and wherein a default value of the signature sequence is a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource.

17. The method of claim 16, wherein a channelization code of the second available resource is equal to a channelization code of the first available resource.

18. The method of claim 13, wherein the second available resource is further defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, with the value being a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource, or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.

19. A mobile terminal for requesting access to a wireless communication system, comprising:
a receiver circuit configured to receive broadcasted system information that indicates a first available resource of a contention based channel, wherein the contention based channel is an Enhanced Dedicated Channel (E-DCH); and
a processing circuit configured to derive a second available resource of the same contention based channel based on the first available resource of the contention based channel, and to transmit an access request preamble mapped to the second available resource;
wherein each E-DCH resource is defined by a Fractional Dedicated Physical Control Channel (F-DPCH) code number information element, an “E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH) info for common E-DCH” information element, and a Soffset information element that indicates a slot within the F-DPCH in which power control commands are included for the F-DPCH code number; and
wherein if a Soffset information element is not received for the second available resource, the mobile terminal determines a default Soffset value for the second available resource as function of an Soffset value received for the first available resource.

20. The mobile terminal of claim 19, wherein the processing circuit is further configured to randomly select the access request preamble.

21. The mobile terminal of claim 19, wherein the processing circuit is further configured to, when receiving an acknowledgement of the transmitted access request preamble, transmit uplink data on the contention based channel using the second available resource.

22. The mobile terminal of claim 19, wherein the received broadcasted system information is included in a System Information Block type 5 (SIB5).

23. The mobile terminal of claim 19, wherein the second available resource is indicated in an ordered list of resources as a function of the first available resource in the ordered list.

24. The mobile terminal of claim 23, wherein the processing circuit is configured to, if a Soffset information element is not received for the second available resource, determine the default Soffset value for the second available resource according to the following equation:


Soffset=(offset+common E-DCH resource list position)mod 10


where:
“offset” is the value of the Soffset information element in the broadcasted system information that indicates the first available resource, and if the Soffset information is not present in the broadcasted system information that indicates the first available resource then the offset is set to zero; and
“common E-DCH resource list position” indicates a position of the second available resource in the ordered list.

25. The mobile terminal of claim 24, wherein the F-DPCH code number information element is the same for a maximum of ten common E-DCH resources.

26. The mobile terminal of claim 24, wherein the “E-HICH info for common E-DCH” information element is defined by a channelization code and a signature sequence, and wherein a default value of the signature sequence is a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource.

27. The mobile terminal of claim 26, wherein a channelization code of the second available resource is equal to a channelization code of the first available resource.

28. The mobile terminal of claim 24, wherein the second available resource is further defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, with the value being a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource, or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.

29. A base station for managing access to a wireless communications network, comprising:
a processing circuit configured to encode system information indicating a second available resource of a contention based channel relative to a first available resource of the same contention based channel, wherein the contention based channel is an Enhanced Dedicated Channel (E-DCH); and
a transmitter circuit configured to broadcast the encoded system information;
wherein each E-DCH resource is defined by a Fractional Dedicated Physical Control Channel (F-DPCH) code number information element, an “E-DCH Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH) info for common E-DCH” information element, and a Soffset information element that indicates a slot within the F-DPCH in which power control commands are included for the F-DPCH code number; and
wherein the processing circuit is configured to instruct a mobile terminal to determine a default Soffset value for the second available resource as function of an Soffset value of the first available resource by omitting the Soffset information element for the second available resource in the encoded system information.

30. The base station of claim 29, wherein the system information is included in a System Information Block type 5 (SIB5).

31. The base station of claim 29, wherein the second available resource is indicated in an ordered list of resources as a function of the first available resource in the ordered list.

32. The base station of claim 31, wherein to instruct the mobile terminal to determine a default Soffset value for the second available resource, the processing circuit is configured to cause the mobile terminal to determine the default Soffset value according to the following equation:


Soffset=(offset+common E-DCH resource list position)mod 10


where:
“offset” is the value of the Soffset information element in the encoded system information, and if the Soffset information is not present in the encoded system information then the offset is considered to be zero; and
“common E-DCH resource list position” indicates a position of the second available resource in the ordered list.

33. The base station of claim 31, wherein the F-DPCH code number information element is the same for a maximum of ten common E-DCH resources.

34. The base station of claim 31, wherein the “E-HICH info for common E-DCH” information element is defined by a channelization code and a signature sequence, and wherein a default value of the signature sequence is a function of the position of the second available resource within the ordered list, a function of a “Signature Sequence” value of a previous first available resource, or a function of the position of the second available resource and the “Signature Sequence” value of a previous first available resource.

35. The base station of claim 34, wherein a channelization code of the second available resource is equal to a channelization code of the first available resource.

36. The base station of claim 31, wherein the second available resource is further defined by a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel, with the value being a function of the position of the second available resource within the ordered list of common E-DCH resources, a function of a value in an information element of a scrambling code of an uplink Dedicated Physical Control Channel of a previous first available resource, or a function of the position of the second available resource and an “Uplink DPCH code info for Common E-DCH” value in the information element of a scrambling code of an uplink Dedicated Physical Control Channel of the previous first available resource.