Method for operating a fast random access procedure in a wireless communication system and a device therefor

• US 10,555,348 B2
• Filed: 03/08/2016
• Issued: 02/04/2020
• Est. Priority Date: 03/11/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Sunyoung, Yi, Seungjune
• Primary Examiner(s): Nooristany, Sulaiman
• Application Number:
  US15/551,393
• Publication Number:
  US 20180070382A1
• Time in Patent Office: 1,428 Days
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for operating fast random access procedure in a wireless communication system, the method comprising: starting a Random Access Response (RAR) reception procedure by transmitting a Random Access Preamble (RAP) to an e-NodeB (eNB); receiving, from the eNB, an indicator indicating that the UE check a condition for whether the UE stops the RAR reception procedure or not, checking whether the condition is met or not; and stopping RAR reception procedure if the condition is met.

Claims

1. A method for performing a Random Access Procedure by a User Equipment (UE) operating in a wireless communication system, the method comprising:

transmitting a Random Access Preamble (RAP) to a base station;

starting a Random Access Response (RAR) reception procedure;

receiving, from the base station, a RAR including an indicator indicating early termination of the RAR reception procedure and a RAP identifier (ID) corresponding to the transmitted RAP;

when a predefined condition for early termination is met;

terminating the RAR reception procedure; and

proceeding to a selection of a Random Access Resource including transmission of a RAP within a RAR window; and

when the predefined condition for early termination is not met;

keeping performing the RAR reception procedure; and

transmitting a Msg3 to the base station after the RAR window;

wherein the predefined condition for early termination includes that a number of RAP transmissions is less than a threshold.

2. The method according to claim 1, wherein the RAR reception procedure is monitoring a Physical Downlink Control Channel (PDCCH) for a RAR addressed by Random Access- Radio Network Temporary Identifier (RA-RNTI) within the RAR window.

3. The method according to claim 1, further comprising:

performing a procedure related to RAR reception failure when the predefined condition is met.

4. The method according to claim 1,

wherein the keeping performing the RAR reception procedure includes processing Timing Advance Command and processing Uplink Grant value.

5. A User Equipment (UE) operating in a wireless communication system, the UE comprising:

a Radio Frequency (RF) module; and

a processor configured to control the RF module, wherein the processor is configured;

to transmit a Random Access Preamble (RAP) to a base station;

to start a Random Access Response (RAR) reception procedure;

to receive, from the base station, a RAR including an indicator indicating early termination of the RAR reception procedure and a RAP identifier (ID) corresponding to the transmitted RAP;

to check whether the condition is met or not; and

when a predefined condition for early termination is met;

to terminate the RAR reception procedure if the condition is met; and

to proceed to a selection of a Random Access Resource including transmission of a RAP within a RAR window; and

when the predefined condition for early termination is not met;

to keep performing the RAR reception procedure; and

to transmit a Msg3 to the base station after the RAR window;

wherein the predefined condition for early termination includes that a number of RAP transmissions is less than a threshold.

6. The UE according to claim 5, wherein the RAR reception procedure is monitoring a Physical Downlink Control Channel (PDCCH) for a RAR addressed by Random Access- Radio Network Temporary Identifier (RA-RNTI) within the RAR window.

7. The UE according to claim 5, wherein the processor is further configured to perform a procedure related to RAR reception failure when the predefined condition is met.

8. The UE according to claim 5, wherein the processor is further configured to keep performing the RAR reception procedure by processing Timing Advance Command and processing Uplink Grant value.