Method and apparatus for performing contention resolution for contention based PUSCH transmission in wireless communication system

• US 10,397,952 B2
• Filed: 05/02/2016
• Issued: 08/27/2019
• Est. Priority Date: 04/30/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Youngdae, Seo, Hanbyul, Yi, Seungjune, Lee, Sunyoung
• Primary Examiner(s): Taha, Shukri
• Application Number:
  US15/569,305
• Publication Number:
  US 20180124827A1
• Time in Patent Office: 1,212 Days
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A method and apparatus for performing contention resolution for contention based physical uplink shared channel (CB-PUSCH) transmission in a wireless communication system is provided. A user equipment (UE) performs a first hybrid automatic repeat request (HARQ) transmission on a CB-PUSCH to a network, and determines whether contention on the CB-PUSCH is resolved. The CB-PUSCH is a channel for UL data allocated by a pre-configured UL grant which is shared by multiple UEs. If a UL grant includes an identity of the UE, it is determined that contention on the CB-PUSCH is resolved. The UE may perform a second HARQ transmission for the first HARQ transmission on a PUSCH to the network by using the UL grant.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

performing a first hybrid automatic repeat request (HARQ) transmission, on a contention based physical uplink shared channel (CB-PUSCH), to a network;

receiving a UL grant on a physical downlink control channel (PDCCH) from the network,

wherein the UL grant includes an identity of the UE;

determining that contention on the CB-PUSCH is resolved based on the identity of the UE; and

performing a second HARQ transmission for the first HARQ transmission, on a non-contention PUSCH, to the network based on the UL grant,

wherein the CB-PUSCH is a channel for UL data allocated by a pre-configured UL grant which is shared by multiple UEs.

2. The method of claim 1, further comprising receiving an acknowledgement/non-acknowledgement (ACK/NACK) of the second HARQ transmission on a physical HARQ indicator channel (PHICH) from the network.

3. The method of claim 2, further comprising determining whether to perform a third HARQ transmission, for the second HARQ transmission, based on the received ACK/NACK.

4. The method of claim 1, wherein the UL grant includes a HARQ process ID assigned by the network.

5. The method of claim 1, wherein it is determined that contention on the CB-PUSCH is not resolved when the UE does not receive a UL grant on a PDCCH for HARQ retransmission or the UL grant does not include an identity of the UE.

6. The method of claim 5, further comprising transmitting a scheduling request (SR) to the network via one of a random access, a dedicated scheduling request, or a contention based SR (CB-SR).

7. The method of claim 5, further comprising retrying the first HARQ transmission on the CB-PUSCH to the network for a certain time period.

8. A user equipment (UE) in a wireless communication system, the UE comprising:

a memory;

a transceiver; and

a processor, operatively coupled to the memory and the transceiver,

wherein the processor is configured to;

perform a first hybrid automatic repeat request (HARQ) transmission, on a contention based physical uplink shared channel (CB-PUSCH), to a network,

control the transceiver to receive a UL grant on a physical downlink control channel (PDCCH) from the network,

wherein the UL grant includes an identity of the UE;

determine that contention on the CB-PUSCH is resolved based on the identity of the UE; and

perform a second HARQ transmission for the first HARQ transmission, on a non-contention PUSCH, to the network based on the UL grant,

wherein the CB-PUSCH is a channel for UL data allocated by a pre-configured UL grant which is shared by multiple UEs.

9. The UE of claim 8, wherein it is determined that contention on the CB-PUSCH is not resolved when the UE does not receive a UL grant on a PDCCH for HARQ retransmission or the UL grant does not include an identity of the UE.