Source: http://www.google.com/patents/US7551596?dq=4200770
Timestamp: 2013-12-05 06:19:51
Document Index: 105697191

Matched Legal Cases: ['arts 520', 'arts 520', 'art 520', 'art 530', 'art 520', 'art 530', 'arts 805', 'art 815', 'art 915', 'art 915', 'art 1215', 'art 1215']

Patent US7551596 - Method and apparatus for signaling control information of uplink packet data ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA method and apparatus for transmitting control information relating to an uplink packet data service from a user equipment (UE) to a Node B in a mobile communication system are provided. MAC-es protocol data units (PDUS) including data of an upper layer and a control service data unit (SDU) including...http://www.google.com/patents/US7551596?utm_source=gb-gplus-sharePatent US7551596 - Method and apparatus for signaling control information of uplink packet data service in mobile communication systemPublication numberUS7551596 B2Publication typeGrantApplication numberUS 11/269,886Publication dateJun 23, 2009Filing dateNov 9, 2005Priority dateNov 9, 2004Fee statusPaidAlso published asEP1810484A1, EP1810484A4, EP1810484B1, US20060165045, WO2006052085A1Publication number11269886, 269886, US 7551596 B2, US 7551596B2, US-B2-7551596, US7551596 B2, US7551596B2InventorsSoeng-Hun Kim, Gert Jan Van LieshoutOriginal AssigneeSamsung Electronics Co., Ltd.Patent Citations (16), Non-Patent Citations (3), Referenced by (11), Classifications (18), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for signaling control information of uplink packet data service in mobile communication systemUS 7551596 B2Abstract A method and apparatus for transmitting control information relating to an uplink packet data service from a user equipment (UE) to a Node B in a mobile communication system are provided. MAC-es protocol data units (PDUS) including data of an upper layer and a control service data unit (SDU) including control information of a MAC layer are multiplexed and contained in a MAC-e protocol data unit (PDU) transmitted in an uplink from the UE during one transmission period. In a header of the MAC-e PDU, a header part corresponding the control SDU contains a data description indicator (DDI) field set as a specific value representing that the control information is transmitted, and a header part corresponding to the MAC-es PDU contains a DDI field which represents a MAC-e flow and a logical channel relating to uplink packet data included in the second PDU, and a data size. Node B detects the control information from the control SDU based on the DDI field set as the specific value. Since the header part representing the control information has a structure similar to the header part representing the MAC-es PDU, the structure of the header is simplified, and the header size of the packet is minimized.
PRIORITY This application claims the benefit under 35 U.S.C. 119(a) of Korean Patent Applications Serial Nos. 2004-91093 and 2004-109938, filed in the Korean Intellectual Property Office on Nov. 9, 2004 and Dec. 21, 2004, respectively, the entire contents of which are hereby incorporated by reference.
Herein, �Io� represents the total receiving wideband power spectral density of the Node B, and �No� represents the thermal-noise power spectral density of the Node B. Therefore, �ROT� represents uplink radio resources which the Node B can allocate for the E-DCH packet data service in an uplink.
As described above, buffer status information, and so on, required for providing an uplink packet data service through an E-DCH is essential control information for an efficient scheduling of a Node B. A protocol for transmitting/receiving control information as described above between a UE and a Node B is called a Medium Access Control for E-DCH (MAC-e). For this reason, the control information is called �MAC-e control information�. Therefore, a detailed method for more efficiently signaling the MAC-e control information has been required.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made to address the above-mentioned problems occurring in the prior art. The present invention provides a method and apparatus for transmitting/receiving MAC-e control information as a part of a MAC-e PDU in a mobile communication system which supports an uplink packet data service.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENT Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted for conciseness.
Referring to FIG. 4A, a UE 402 includes radio link control (RLC) entities 405A to 405C, 407A, and 407B (hereinafter, simply referred to as �405 and 407�) of an RLC layer, control an traffic (C/T) multiplexing units 410A and 410B for inserting multiplexing information into data transmitted from the RLC entities 405 and 407, and a Media Access Control for E-DCH/serving RNC (MAC-e/es) layer 420.
The C/T multiplexing units 410A and 410B insert multiplexing information into data transmitted from the RLC entities 405 and 407 through logical channels. The multiplexing information may be an identifier of the logical channel, and a receiving side transmits received data to an appropriate receiving-side RLC entity with reference to the identifier. The C/T multiplexing units 410A and 410B are also called �MAC-d� layers.
Data output from each C/T multiplexing unit 410A or 410B is called a �MAC-d PDU�, and a series of MAC-d PDUs is called a �MAC-d flow� 415. The MAC-d flow 415 is obtained by classifying logical channels based on requested quality of service (QoS). Data of logical channels requesting the same QoS are classified into the same MAC-d flow 415, and the MAC-e/es layer 420 can provide a specific QoS for each of the MAC-d flows. The QoS may be controlled, for example, by controlling the number of HARQ retransmission or by adjusting the transmission power.
The RNC 462 includes reordering queues 465 and 470, disassembly units 475 and 480, C/T demultiplexing units 485 and 487, RLC entities 490A to 490C, 492A and 492B (hereinafter, simply referred to as �490 and 492�).
EXEMPLARY EMBODIMENT 1 FIG. 5 is a block diagram illustrating the structure of a MAC-e PDU according to a first exemplary implementation of an embodiment of the present invention. A MAC-e PDU 505 is a data provided through a transmission channel to a physical layer, and includes a MAC-e header 510 and a MAC-e payload 515.
The MAC-e header 510 includes k number of header parts 520 and 530 (herein, �k� is a positive integer), and the header parts 520 and 530 correspond to the data units 540 and 550 included in the MAC-e payload 515 by one-to-one in the sequence of their positions in the MAC-e header 510. That is, a first header part 520 corresponds to the MAC-e control PDU ([1]: MAC-e control SDU) 540, and a kth header part 530 corresponds to a kth MAC-es PDU ([k]: MAC-es PDU) 550. Each header part 520 or 530 includes a multiplexing identifier 522 or 532, an N field 524 or 534 for representing the number of PDUs, and an F field 526 or 536 for representing a flag. The following description will be given with respect to the header part 530 corresponding to the kth MAC-es PDU 550 which contains RLC PDUs.
The multiplexing and TSN setting unit 430 of the UE 402 stores relationship information as shown in Table 1. When receiving RLC PDUs through a logical channel, the multiplexing and TSN setting unit 430 determines a multiplexing identifier for the RLC PDUs with reference to the identifier of the logical channel. If the logical channel corresponds to a plurality of multiplexing identifiers, the multiplexing and TSN setting unit 430 determines corresponding multiplexing identifiers with reference to the size of the received RLC PDUs. For instance, when receiving RLC PDUs, each of which has a size of 336 bits, through LCH 2, the multiplexing and TSN setting unit 430 configures a MAC-es PDU with the RLC PDUs, and determines a multiplexing identifier as �2.� Although the present invention is described with respect to a multiplexing identifier having a size of 4 bits, the scope of the present invention is not limited thereto.
When it is determined to transmit a MAC-e control information 545, the MAC-e control information 545 is inserted into the MAC-e payload 515 of the MAC-e PDU 505 by the E-DCH transmission control unit 425 of the UE 402. A special value of a multiplexing identifier is allocated for the MAC-e control SDU 540 containing the MAC-e control information 545. That is, a separate header structure is not used for the MAC-e control information 545. For convenience of description, the special value corresponding to a MAC-e control SDU 540 will be called �Mux_id_control� in the following description.
First, the N field 524 contains information about the number of the MAC-e control SDUs 540. In this case, since the N field 524 always has a value of �1�, the N field 524 is not needed.
In step 615, the multiplexing and TSN setting unit 430 sets a multiplexing identifier of a MAC-e header part corresponding to the MAC-e control SDU, as the Mux_id_control which is a predetermined special value. In step 620, the multiplexing and TSN setting unit 430 sets an N field for the MAC-e control SDU. If an N field for the MAC-e control SDU is not used, step 620 is omitted. In step 625, the multiplexing and TSN setting unit 430 sets an F field. If there is a MAC-es PDU which follows to a MAC-e header part corresponding to the MAC-e control SDU, the F field has �1,� and if not, then the F field has a �0.�
EXEMPLARY EMBODIMENT 2 According to the first exemplary implementation of an embodiment of the present invention, a multiplexing identifier included in a MAC-e header of a MAC-e PDU is used to identify a logical channel, a reordering queue, and an RLC PDU size. Different from the first embodiment, the second exemplary implementation of an embodiment of the present invention uses a data description indicator (DDI) in order to identify a MAC-d flow instead of the reordering queue. The combination of a logical channel, a reordering queue, and an RLC PDU size is identical to the combination of a logical channel, a MAC-d flow, and an RLC PDU size, in view that both include information about the size of RLC PDUs contained in a MAC-es PDU and information about an upper layer to which the RLC PDUs will be transmitted. The second exemplary implementation of an embodiment of the present invention uses a DDI, which is a logical identifier for identifying a logical channel, a MAC-d flow, and an RLC PDU size, in order to represent a MAC-e control SDU.
One of the DDI values may take the place of the F field. As described above, the F field acts as a flag for representing whether the following field is a new MAC-e header part or a MAC-e payload. When a predetermined value (for example, �111111�) is allocated as a special DDI value, the special DDI value represents the end of a MAC-e header for distinguishing a MAC-e header from a MAC-e payload.
The MAC-e payload 845 of the MAC-e PDU 835 includes MAC-es PDUs 850, each of which contains a TSN and a plurality of RLC PDUs. �k� number of header parts 805, 810, and 815 of the MAC-e header 840 one-to-one correspond to components included in the MAC-e payload 845. The MAC-e header part #1 805 corresponding to a first MAC-es PDU 850 is configured with a DDI field 820 (which represents a logical channel, a reordering queue, and an RLC PDU size) and an N field 825 for representing the number of RLC PDUs. Similarly, the MAC-e header part #2 810 is configured with a DDI field an N field for the next MAC-es PDU. The DDI field 830 of the kth header part 815 (which is the last part) is set as a special DDI value, i.e. �111111�, as described above, in order to represent the end of the MAC-e header 840. Predetermined parts of the MAC-e payload corresponding to the special DDI value can be padded with padding bits 855. That is, the special DDI value represents that an RLC PDU may not exist in the predetermined part of the MAC-e payload 845 corresponding to the DDI field 830.
The DDI field 930 of the kth header part 915 (which is the last part) is set as a special DDI value, e.g. �111111�, in order to represent that a relevant portion in the MAC-e payload contains a MAC-e control SDU 960. The N field of the last header part 915 is not used.
EXEMPLARY EMBODIMENT 3 According to the first exemplary embodiment, a special DDI value representing a MAC-e control SDU is used for a DDI field, and an N field relating to the DDI field is used to represent a kind of control information inserted into the MAC-e control SDU.
Similarly, the kth header part 1215 (which is the last part) is configured with a DDI field 1230 an N field 1235. The DDI field 1230 is set as a special DDI value, e.g. �111111�, in order to represent that a relevant portion in the MAC-e payload contains a MAC-e control SDU 1260. The special DDI value represents a MAC-e control SDU including MAC-e control information. The MAC-e control information represents power information of a UE, buffer status information of the UE, and so on. The N field 1235 of the kth header part 1215 represents kinds of the MAC-e control information. For instance, predetermined values, for example, as �0� for padding, �1�: for power information, �2� for buffer status information, and so on, may be used as values of N field 1235 relating to the DDI field 1230.
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