Source: http://www.google.com/patents/US6829482?dq=6,247,130
Timestamp: 2014-12-17 21:45:16
Document Index: 278967423

Matched Legal Cases: ['art 1', 'art 1', 'art 5', 'art 1', 'art 1', 'art 5']

Patent US6829482 - Switching from dedicated to common channels when radio resources are ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA serving radio network controller (SRNC) of a radio access network assigns one or both of an appropriate temporary identifier (C-RNTI) and radio resources to a connection which is switched from a dedicated channel to a common channel in a cell handled by a drift radio network controller (DRNC). In one...http://www.google.com/patents/US6829482?utm_source=gb-gplus-sharePatent US6829482 - Switching from dedicated to common channels when radio resources are controlled by drift radio networkAdvanced Patent SearchPublication numberUS6829482 B2Publication typeGrantApplication numberUS 09/854,846Publication dateDec 7, 2004Filing dateMay 15, 2001Priority dateMay 16, 2000Fee statusPaidAlso published asUS20020025815, WO2001089235A2, WO2001089235A3, WO2001089235A8Publication number09854846, 854846, US 6829482 B2, US 6829482B2, US-B2-6829482, US6829482 B2, US6829482B2InventorsG�ran Rune, Gert-Jan van LieshoutOriginal AssigneeTelefonaktiebolaget Lm Ericsson (Publ)Export CitationBiBTeX, EndNote, RefManPatent Citations (38), Non-Patent Citations (15), Referenced by (22), Classifications (15), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetSwitching from dedicated to common channels when radio resources are controlled by drift radio networkUS 6829482 B2Abstract A serving radio network controller (SRNC) of a radio access network assigns one or both of an appropriate temporary identifier (C-RNTI) and radio resources to a connection which is switched from a dedicated channel to a common channel in a cell handled by a drift radio network controller (DRNC). In one embodiment, the appropriate temporary identifier (C-RNTI) and the radio resources are obtained by the serving radio network controller (SRNC) upon execution of a channel switching process (e.g., when it has been determined that a connection should be switched from a dedicated channel to a common channel). In another embodiment of the invention, the serving radio network controller (SRNC) can obtain the appropriate temporary identifier (C-RNTI) and the radio resources prior to an actual channel switch operation. In both embodiments, the obtaining of the temporary identifier and/or radio resources can be part of a Common Transport Channel Resources Initialization procedure.
There are several interfaces of interest in the UTRAN. The interface between the radio network controllers (RNCs) and the core network(s) is termed the �Iu� interface. The interface between a radio network controller (RNC) and its base stations (BSs) is termed the �Iub� interface. The interface between the user equipment unit (UE) and the base stations is known as the �air interface� or the �radio interface� or the �Uu interface�. In some instances, a connection involves both a Serving or Source RNC (SRNC) and a target or drift RNC (DRNC), with the SRNC controlling the connection but with one or more diversity legs of the connection being handling by the DRNC (see, in this regard, U.S. patent application Ser. No. 09/035,821 filed Mar. 6, 1998, entitled �Telecommunications Inter-Exchange Measurement Transfer�; and U.S. patent application Ser. No. 09/035,788 filed Mar. 6, 1998, entitled �Telecommunications Inter-Exchange Congestion Control�, both of which are incorporated herein by reference). The interface between a SRNC and a DRNC is termed the �Iur� interface.
(1) 3GPP TS 25.211, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (FDD)�.
(2) 3GPP TS 25.221, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (TDD)�.
(3) 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�.
In the foregoing, �3GPP� refers to a project known as the Third Generation Partnership Project (3GPP), which has undertaken to evolve further the UTRAN and GSM-based radio access network technologies.
From a resource management point of view, the downlink shared channel (DSCH) is managed by the network (UTRAN) in a similar way as the dedicated channel (DCH). Thus, from the resource management point of view, the downlink shared channel (DSCH) is essentially a dedicated resource. Accordingly, as used herein, a �common channel� is any one of the common transport channels excluding the downlink shared channel (DSCH), and a �dedicated channel� herein means dedicated transport channels and the downlink shared channel (DSCH).
On various occasions, it may be necessary or desirable to switch from a common channel to a dedicated, or conversely from a dedicated channel to a common channel, using what has been termed �channel switching�. Various techniques for channel switching are described in the following United States Patent Applications, all of which are incorporated herein by reference: U.S. patent application Ser. No. 09/429,497 (attorney reference 2380-150), filed Oct. 28, 1999, entitled �Channel-Type Switching To A Common Channel Based On Common Channel Load�; U.S. patent application Ser. No. 09/457,141 (attorney reference 2380-165), filed Dec. 8, 1999, entitled �Channel-Type Switching Control�; U.S. patent application Ser. No. 09/537,689, filed Mar. 29, 2000, entitled �Channel-Type Switching Based On Cell Load�.
When switching a connection from common channels to dedicated channels in UMTS, the network (UTRAN) selects the radio resources. Furthermore, in order to request that the user equipment unit (UE) switch to the selected dedicated channels, the network (UTRAN) sends information describing the selected resources to the user equipment unit (UE) using certain signaling messages in a physical channel reconfiguration procedure, as described, e.g., in 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�. In the context of this particular switch, the radio resources are the physical channel and transport channel resources for the dedicated transport channels (DCH) and/or downlink shared channel (DSCH) to be employed. The physical channel resources are those such as uplink DPCH, downlink DPCH, and/or downlink physical DSCH. For a definition of these channels and more detailed information, see, e.g., 3GPP TS 25.211, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (FDD)� or 3GPP TS 25.221, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (TDD)�.
When switching from dedicated channels to common channels in UMTS, on the other hand, there are two different or alternative ways of assigning radio resources to be used by a user equipment unit (UE). In the context of this type of channel switching, the radio resources are the physical channel and transport channel resources for the common transport channels RACH, FACH, and/or CPCH (but not including the downlink shared channel (DSCH)). The physical channel resources are those such as the primary CPICH, secondary CCPCH, and/or physical RACH. For a definition of these channels and more detailed information, again see, e.g., 3GPP TS 25.211, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (FDD)� or 3GPP TS 25.221, v.3.2.0 �Physical Channels and Mapping of Transport Channels Onto Physical Channels (TDD)�.
A first of the alternate ways of assigning radio resources when switching from dedicated channels to common channels in UMTS is to let the user equipment unit (UE) select the radio resources. When the user equipment unit (UE) is to switch to the common channels, the network sends information that the user equipment unit (UE) shall switch to common channel resources via signaling messages in accordance with a physical channel reconfiguration procedure (described, e.g., in 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�). The user equipment unit (UE) then, as a result of receipt of the signaling message, enters a state know as the Cell_FACH state, in which the user equipment unit (UE) detects and reads the broadcast channel in the cell to find the radio resources to be utilized for the common channel (e.g., as in an RCC Connection Re-establishment� procedure. The UMTS provides certain rules which govern the selection of radio resources for this alternative, as described in 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�.
A second of the alternate ways of assigning radio resources when switching from dedicated channels to common channels in UMTS is for the network (UTRAN) to select the radio resources. When the user equipment unit (UE) is to switch to the common channels, the network sends information describing the network-selected resources to the user equipment unit (UE) via signaling messages in accordance with a physical channel reconfiguration procedure (described, e.g., in 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�).
BRIEF SUMMARY OF THE INVENTION A serving radio network controller (SRNC) of a radio access network assigns an appropriate temporary identifier (C-RNTI) and (optionally) radio resources to a connection which is switched from a dedicated channel to a common channel in a cell handled by a drift radio network controller (DRNC). In one embodiment, the appropriate temporary identifier (C-RNTI) and the radio resources are obtained by the serving radio network controller (SRNC) upon execution of a channel switching process (e.g., when it has been determined that a connection should be switched from a dedicated channel to a common channel). In another embodiment of the invention, the serving radio network controller (SRNC) can obtain the appropriate temporary identifier (C-RNTI) and the radio resources prior to an actual channel switch operation. In both embodiments, the obtaining of the temporary identifier and/or radio resources can be part of (e.g., an extension to) a Common Transport Channel Resources Initialization procedure.
A user equipment unit (UE), such as user equipment unit (UE) 30 shown in FIG. 1, communicates with one or more base stations (BS) 28 over a radio or air interface 32 (the �Uu interface�). Each of the radio interface Uu 32, the Iu interface, the Iub interface, and the Iur interface are shown by dash-dotted lines in FIG. 1.
In the scenario shown in FIG. 1B, FIG. 2, and FIG. 5, serving radio network controller (SRNC) 26 1 controls the connection with user equipment unit (UE) 30, but drift radio network controller (DRNC) 26 2 manages the radio resources for the cells under its control, including the cell in which user equipment unit (UE) 30 is currently located. In accordance with the first example embodiment of FIG. 2, the data processing and control unit 36 1 of serving radio network controller (SRNC) 26 1 executes a channel switching process 100. Advantageously, channel switching process 100 enables serving radio network controller (SRNC) 26 1 to assign radio resources to be utilized for the connection with user equipment unit (UE) 30 upon switching the connection from dedicated to common channels, even though user equipment unit (UE) 30 is in a cell controlled by drift radio network controller (DRNC) 26 2. As used herein, terminology such as �radio resources� and �channel-switching related information� encompasses, e.g., (1) an implicit assignment or allocation of radio resources as may occur by specifying a particular cell to be utilized after the channel switch operation; and (2) an explicit assignment or allocation of radio resources such as specific channel(s) to be utilized after the channel switch operation (e.g., in addition to also possibly specifying the particular cell to be utilized after the channel switch operation). It should be recalled that a user equipment unit (UE) may be able to communication with or in several cells, and that a base station may serve plural cells from a single base station site.
Basic example steps performed by channel switching process 100 of serving radio network controller (SRNC) 26 1, and certain responsive steps performed by resource allocation process 90 of drift radio network controller (DRNC) 26 2, are illustrated in FIG. 3. As reflected by step 100-1, channel switching process 100 checks whether a connection should be switched from dedicated channels to common channels. The check of step 100-1 can be performed in any of several manners. In one example of how step 100-1 can be implemented, channel switching process 100 ascertains a decrease in the needed data transfer rate (e.g., due to low amounts of data to be sent to user equipment unit (UE) as measured by serving radio network controller (SRNC) 26 1, or due to low amounts of data to be sent from the user equipment unit (UE) 30 as measured by and reported by user equipment unit (UE) 30). Such example is understood, for example, with reference to U.S. patent application Ser. No. 09/429,497 (attorney reference 2380-150), filed Oct. 28, 1999, entitled �Channel-Type Switching To A Common Channel Based On Common Channel Load� and U.S. patent application Ser. No. 09/457,141 (attorney reference 2380-165), filed Dec. 8, 1999, entitled �Channel-Type Switching Control�.
The person skilled in the art understands how the resource allocation process 90 of drift radio network controller (DRNC) 26 2 ascertains the information to be used for each of the information elements of response message 3-2. For example, for one mode of the invention the Physical Channel Reconfiguration message in the RRC Protocol Specification (3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�) and the procedure text governing its use include information that is required for the response message 3-2. In essence, the person skilled in the art can study the information the UE receives by detecting and reading the broadcast channel in the cell. On a high level the required information is thus information on the Physical RACH (PRACH), the RACH, the AICH, and the Primary CPICH. The mechanism to be used is to allocate resources from the configuration of the cell where the SRNC requests resources. The identifier S-RNTI has to be known in advance by the DRNC, which is the case in 3GPP since the UE is using dedicated resources and the procedures for those ensure that the DRNC has the S-RNTI valid for the UE available.
Step 100-3 of channel switching process 100 shows receipt at serving radio network controller (SRNC) 26 1 of the response message 3-2. Following the receipt at step 100-3 of response message 3-2, channel switching process 100 performs step 100-4. As step 100-4, channel switching process 100 issues a request 3-3 to the user equipment unit (UE) 30 involved with the channel switch-affected connection, the request of step 100-4 directing the user equipment unit (UE) 30 to switch to common channels. The request 3-3 issued as step 100-4 can, as an example in one mode of the invention, take the form of a �Physical Channel Reconfiguration� message as described in 3GPP TS 25.331, v.3.2.0 �RRC Protocol Specification�. As a minimum, the request message 3-3 issued to user equipment unit (UE) 30 apprises the user equipment unit (UE) 30 of the C-RNTI allocated to the affected connection by drift radio network controller (DRNC) 26 2.
FIG. 4C-1 shows example information elements that can be included in the message 3-3 issued from channel switching process 100 to user equipment unit (UE) 30 in connection with the requested channel switch for a first mode of the invention. The information element 4C-1 includes the U-RNTI, which comprises the identity of serving radio network controller (SRNC) 26 1 and the S-RNTI, and which serves to explain how the connection/UE is identified in the user equipment unit (UE) and SRNC, respectively. The information element 4C-2 is the C-RNTI, which (as mentioned above, is the C-RNTI allocated to the affected connection by drift radio network controller (DRNC) 26 2. Further, the message 3-3 includes the information element 4C-3 which assigns the specific cell to be utilized by the user equipment unit (UE) as a result of the channel switch operation. In UMTS, the cell identifier of information element 4C-3 can be the primary scrambling code of the cell. By selecting and assigning the specific cell for the user equipment unit (UE), the serving RNC (SRNC) implicitly or indirectly allocates the radio resources of the drift RNC (DRNC). In the meaning of �radio resources� as used herein, by specifying the cell to be utilized by the connection involving the user equipment unit (UE) the serving RNC (SRNC) does (implicitly) allocate radio resources, and the cell identification is information regarding radio resources.
Thus, to some degree the embodiment shown in FIG. 2 and FIG. 3 is an extension of the Common Transport Channel Resources Initialization procedure of 3GPP TS 25.423, v.3.1.0 �UTRAN Iur Interface RNSAP Signaling�, in which an initialization request (e.g., request message 3-1) includes the identity of the cell (e.g., comparable to information element 4A-2 in FIG. 4A) and an initiation response message (e.g., request message 3-2) includes the C-RNTI and information on the radio resources to be used (e.g., comparable to information element 4B-2 and 4B-4 respectively in FIG. 4B).
Thus, the embodiment shown in FIG. 5 and FIG. 6 is an extension of the Common Transport Channel Resources Initialization procedure of 3GPP TS 25.423, v.3.1.0 �UTRAN Iur Interface RNSAP Signaling�, in which an initialization request (e.g., request message 3′-1) includes the identity of the cell (e.g., comparable to information element 4A-2 in FIG. 4A) and an initiation response message (e.g., request message 3′-2) includes the C-RNTI and information on the radio resources to be used (e.g., comparable to information element 4B-2 and 4B-4 respectively in FIG. 4B).
In the scenarios in which the radio resource information is not provided by signaling from the serving RNC (SRNC), the user equipment unit (UE) can detect and read the broadcast channel in the cell to find the radio resources to be utilized for the common channel, e.g., as in an RCC Connection Re-establishment� procedure alluded to above.
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