METHODS AND APPARATUS FOR ALLOCATING CELL RADIO NETWORK TEMPORARY IDENTITY

• US 20080139214A1
• Filed: 09/26/2007
• Published: 06/12/2008
• Est. Priority Date: 09/29/2006
• Status: Abandoned Application

• Current Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Original Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Inventors: Li, Xiaoqiang, Lee, Ju-Ho, Zhang, Yujian, SUN, Chengjun
• Application Number:
  US11/861,908
• Publication Number:
  US 20080139214A1
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

The present invention describes that the C-RNTIs are grouped based on the random access preamble sequence, the transmission sub-frame and the transmission random access channel information used for the user equipment and detected by the base station. In such a way, the indicating information bits needed by C-RNTI allocation are decreased and the signaling overhead needed by C-RNTI allocation is also decreased. In addition, the random access process is optimized and the random access performance is improved.

Claims

1. A method for allocating a C-RNTI by a base station, comprising steps of:

a) a user equipment sending a random access preamble sequence to the base station;

b) the base station sending a response message of the random access preamble sequence to the user equipment, the message including Uplink resource assignment information, Timing adjustment information, and information combined with a Random access preamble sequence ID to indicate the CRNTI;

c) the user equipment sending a L3 message to a network end; and

d) the network end sending a response of the L3 message to the user equipment.

2. The method according to claim 1, wherein in Step b), the information combined with the random access preamble sequence ID to indicate the CRNTI is a index of a allocated CRNTI in a specific CRNTI group.

3. The method according to claim 1, wherein in Step b), the response message sent from the base station to the user equipment further includes a random access preamble sequence ID.

4. The method according to claim 2, wherein a grouping model of the C-RNTI group consist in that a whole C-RNTI space is used as a C-RNTI grouping space to perform grouping.

5. The method according to claim 2, wherein a grouping model of the C-RNTI group consists in that a subset of a whole C-RNTI space is used as a C-RNTI grouping space to perform grouping.

6. The method according to claim 2, wherein a grouping model of the C-RNTI group consists in that a CRNTI grouping space is grouped based on the random access preamble sequence.

7. The method according to claim 2, wherein, the specific C-RNTI group is a C-RNTI group corresponding to the random access preamble sequence received by the base station.

8. The method according to claim 2, wherein a grouping model of the C-RNTI group consists in that a CRNTI grouping space is grouped based on a combination of the random access preamble sequence and a transmission sub-frame of the preamble sequence.

9. The method according to claim 2, wherein, the specific C-RNTI group is a C-RNTI group corresponding to a combination of the random access preamble sequence and a transmission sub-frame of the random access preamble sequence received by the base station.

10. The method according to claim 1, wherein a grouping model of the C-RNTI group consists in that a CRNTI grouping space is grouped based on a combination of the random access preamble sequence, a transmission sub-frame of the preamble sequence and a random access channel.

11. The method according to claim 2, wherein the specific C-RNTI group is a C-RNTI group corresponding to a combination of the random access preamble sequence, a transmission sub-frame of the random access preamble sequence received by the base station and a random access channel transmitted by the preamble sequence.

12. The method according to claim 1, wherein in Step b), the response message of the random access preamble sequence transmitted by the base station is transmitted over a L1/L2 control channel.

13. The method according to claim 1, wherein, in Step b), the response message of the random access preamble sequence transmitted by the base station is transmitted over a downlink shared data channel.

14. A base station apparatus for allocating a C-RNTI, comprising an antenna, a cyclic prefix adding module, an OFDM modulation module, a modulation module, a rate matching module, a channel coding/interleaving module, and further comprising:

a) a random access preamble sequence detector, for detecting random access preamble sequences sent by a user equipment, identifying transmission sub-frames and transmission random access channels;

b) a controller for determining a C-RNTI group of the transmission random access preamble sequence response, choosing a proper C-RNTI in the group, and sending it to a Control Information generator to generate CRNTI allocation control information according to the random access preamble sequence detected by the random access preamble sequence detector, the transmission sub-frame and the transmission random access channel, by referring to a group corresponding relationship determined by a C-RNTI grouping corresponding relation module; and

c) transmitting means for send the control information allocated by the C-RNTI.