UPLINK ACCESS METHOD FOR RECEIVING A POINT-TO-MULTIPOINT SERVICE

• US 20080273482A1
• Filed: 05/01/2008
• Published: 11/06/2008
• Est. Priority Date: 05/02/2007
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Young-Dae, CHUN, Sung-Duck, YI, Seung-June, PARK, Sung-Jun
• Application Number:
  US12/113,826
• Publication Number:
  US 20080273482A1
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

In a wireless mobile communications system, a network transmits a response request message with respect to a particular point-to-multipoint service to a terminal, the terminal transmits uplink access preamble according to information of the received response request message and receives a response message in response to the uplink access preamble. The terminal transmits an uplink message to a network if a terminal identifier together with an identifier of the preamble are included in the response message, and does not transmit the uplink message to the network if only the identifier of the preamble is included in the response message, thereby effectively utilizing uplink radio resources during the uplink access.

Claims

1. A method of receiving a point-to-multipoint service in a wireless communications system, the method comprising:

receiving access information message for the point-to-multipoint service;

transmitting a random access preamble after receiving the access information message;

receiving random access response in response to the random access preamble; and

determining whether or not to transmit a response message for the random access response based on information included in the received random access response.

2. The method of claim 1, wherein the point-to-multipoint service is a MBMS (Multimedia Broadcast/Multicast Service) service and the access information message is a MBMS access information message including a MBMS service identifier (MBMS service ID).

3. The method of claim 1, wherein the random access preamble is one of preambles included in the access information message.

4. The method of claim 1, wherein the random access preamble is a terminal dedicated preamble allocated previously by a network.

5. The method of claim 1, wherein the random access response includes at least one of a preamble identifier, timing adjustment information, newly allocated C-RNTI (Cell-Radio Network Temporary Identities) and uplink radio resource allocation information.

6. The method of claim 5, wherein the response message is transmitted to a network if the random access response includes the preamble identifier and the newly allocated C-RNTI.

7. The method of claim 5, wherein the response message is not transmitted to a network if the random access response does not include the newly allocated C-RNTI.

8. The method of claim 6, wherein the response message is a counting response message according to the uplink radio resource allocation information.

9. The method of claim 8, wherein the counting response message includes the newly allocated C-RNTI and/or a MBMS service identifier (MBMS service ID).

10. The method of claim 8, further comprising:

receiving a contention resolution message in response to the counting response message.

11. The method of claim 10, wherein the contention resolution message includes the newly allocated C-RNTI and/or a MBMS service identifier (MBMS service ID).

12. The method of claim 11, wherein the contention resolution message is received via a RRC message, a MAC control PDU, or a PDCCH (Physical Downlink Control Channel).

13. A method of providing a point-to-multipoint service in a wireless communications system, the method comprising:

transmitting access information message for the point-to-multipoint service;

receiving a random access preamble after the access information message is transmitted; and

transmitting random access response in response to the received random access preamble,

wherein information included in the random access response is used by a terminal for determining whether or not to transmit a response message to a network.

14. The method of claim 13, wherein the point-to-multipoint service is a MBMS (Multimedia Broadcast/Multicast Service) service and the access information message is a MBMS access information message including a MBMS service identifier (MBMS service ID).

15. The method of claim 13, wherein the random access response includes at least one of a preamble identifier, timing adjustment information, newly allocated C-RNTI (Cell-Radio Network Temporary Identities) and uplink radio resource allocation information.

16. The method of claim 15, wherein the response message is received from a terminal if the random access response includes the preamble identifier and the newly allocated C-RNTI.

17. The method of claim 16, wherein the response message is a counting response message according to the uplink radio resource allocation information.

18. The method of claim 17, wherein the counting response message includes the newly allocated C-RNTI and/or a MBMS service identifier (MBMS service ID).

19. The method of claim 17, further comprising:

transmitting a contention resolution message in response to the counting response message.

20. The method of claim 19, wherein the contention resolution message includes the newly allocated C-RNTI and/or a MBMS service identifier (MBMS service ID).

21. The method of claim 20, wherein the counting response message is received via a RRC message or a MAC control PDU (Protocol Data Unit) and the contention resolution message is transmitted through the RRC message, the MAC control PDU, or a PDCCH (Physical Downlink Control Channel).