METHOD AND APPARATUS FOR REPORTING STATISTIC INFORMATION ASSOCIATED WITH RANDOM ACCESS IN A WIRELESS COMMUNICATION SYSTEM

• US 20130039274A1
• Filed: 08/13/2012
• Published: 02/14/2013
• Est. Priority Date: 08/12/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: Ki Dong Lee
• Inventors: LEE, Ki Dong
• Granted Patent: US 9,107,225 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method and apparatus for reporting statistic information associated with random access procedure and back-off process are provided. The method proposes a number of back-off interval reporting modes. The reporting modes include the first mode in which a sequence indicating every back-off interval applied during the back-off process is reported, the second mode in which a total sum of the every back-off interval applied during the back-off process is reported, the third mode in which an average of the every back-off interval applied during the back-off process is reported, and the fourth mode in which a variance of the every back-off interval applied during the back-off process is reported. The reporting information is transmitted via RRC signaling.

Claims

1. A method of reporting data related to random access procedure in a wireless communication system using a number of orthogonal frequency division multiplexing (OFDM) symbols, the method performed by a user equipment (UE) and comprising:

transmitting a random access preamble during the random access procedure to a base station (BS);

establishing a radio resource control (RRC) connection by completing the random access procedure, wherein when contention resolution for the random access preamble is not successful at least one back-off process is performed based on at least one back-off index received during the random access procedure, wherein the at least one back-off index is included in a random access response, wherein each of the back-off index indicates a back-off interval of the UE;

receiving a UE information request from the BS via an RRC message, wherein the UE information request includes bitmap information indicating at least one back-off interval reporting mode of the UE, wherein the at least one back-off interval reporting mode includes a first mode in which a sequence indicating every back-off interval applied during the back-off process is reported to the BS, a second mode in which a total sum of the every back-off interval applied during the back-off process is reported to the BS, a third mode in which an average of the every back-off interval applied during the back-off process is reported to the BS, and a fourth mode in which a variance of the every back-off interval applied during the back-off process is reported to the BS; and

transmitting, in response to the UE information request, a UE information response to the BS via the RRC message, wherein the UE information response includes back-off interval report information configured based on the at least one back-off interval reporting mode.

2. The method of claim 1, wherein the back-off process is performed base on a random value selected from a uniform distribution between zero and an upper bound, the upper bound being indicated by the back-off index.

3. The method of claim 1, wherein the UE information response includes a data field indicating a number of preambles sent for a last successfully completed random access procedure.

4. The method of claim 1, further comprising:

performing an access class barring procedure before transmitting the random access preamble.

5. A user equipment (UE) for reporting data related to random access procedure in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the UE comprising:

a processor configured for;

transmitting a random access preamble during the random access procedure to a base station (BS);

establishing a radio resource control (RRC) connection by completing the random access procedure, wherein when contention resolution for the random access preamble is not successful at least one back-off process is performed based on at least one back-off index received during the random access procedure, wherein the at least one back-off index is included in a random access response, wherein each of the back-off index indicates a back-off interval of the UE;

receiving a UE information request from the BS via an RRC message, wherein the UE information request includes bitmap information indicating at least one back-off interval reporting mode of the UE, wherein the at least one back-off interval reporting mode includes a first mode in which a sequence indicating every back-off interval applied during the back-off process is reported to the BS, a second mode in which a total sum of the every back-off interval applied during the back-off process is reported to the BS, a third mode in which an average of the every back-off interval applied during the back-off process is reported to the BS, and a fourth mode in which a variance of the every back-off interval applied during the back-off process is reported to the BS; and

transmitting, in response to the UE information request, a UE information response to the BS via the RRC message, wherein the UE information response includes back-off interval report information configured based on the at least one back-off interval reporting mode.

6. The user equipment of claim 5, wherein the back-off process is performed base on a random value selected from a uniform distribution between zero and a upper bound, the upper bound being indicated by the back-off index.

7. The user equipment of claim 5, wherein the UE information response includes a data field indicating a number of preambles sent for a last successfully completed random access procedure.

8. The user equipment of claim 5, further comprising:

performing an access class barring procedure before transmitting the random access preamble.