System and method for transmission in a grant-free uplink transmission scheme

• US 10,721,776 B2
• Filed: 05/25/2018
• Issued: 07/21/2020
• Est. Priority Date: 01/27/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Au, Kelvin Kar Kin, Zhang, Liqing, Ma, Jianglei
• Primary Examiner(s): Moore, Jr., Michael J
• Application Number:
  US15/989,810
• Publication Number:
  US 20180279385A1
• Time in Patent Office: 788 Days
• Field of Search: None
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/0841 with collision treatment

Abstract

A system and method includes implementing, by a base station (BS), a reliable ultra-low latency transmission mechanism in a grant-free uplink transmission scheme having defined therein contention transmission unit (CTU) access regions and a plurality of CTUs. Implementing the reliable ultra-low latency transmission mechanism includes defining a reliable ultra-low latency CTU (RULL-CTU) access region from a portion of the CTU access regions of the grant-free transmission scheme, defining an RULL-CTU mapping scheme by mapping at least a portion of plurality of CTUs to the RULL-CTU access region to define a plurality of RULL-CTUs, defining a reliable ultra-low latency user equipment (RULL-UE) mapping scheme by defining rules for mapping a plurality of RULL-UEs to the plurality of RULL-CTUs in an initial pattern for initial transmissions in a first transmission time interval (TTI), and a regrouped pattern for redundant transmissions in a second TTI subsequent to the first TTI.

Claims

1. A method comprising:

mapping a first user equipment (UE) for uplink grant-free transmission to first time-frequency regions of a frequency partition; and

configuring the first UE, using high-level signaling, to perform a configured first number of uplink grant-free transmissions including an initial grant-free transmission and at least one grant-free retransmission irrespective of whether the initial grant-free transmission was successfully received, using time-frequency regions indicated by said mapping.

2. The method of claim 1 further comprising:

configuring the first UE to perform frequency hopping between the initial grant-free transmission and at least one of the at least one grant-free retransmission.

3. The method of claim 1, wherein:

the configured first number of uplink grant-free transmissions is determined based on a reliability mode of the first UE.

4. The method of claim 1, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a pilot.

17. The method of claim 1, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a signature.

18. The method of claim 4, wherein:

each CTU access region is further defined by a signature.

5. A method performed by a user equipment (UE), comprising:

receiving, by high-level signaling, a mapping of the UE for uplink grant-free transmission to first time-frequency regions of a frequency partition; and

performing a configured first number of uplink grant-free transmissions including an initial grant-free transmission and at least one grant-free retransmission irrespective of whether the initial grant-free transmission was successfully received, using time-frequency regions indicated by said mapping.

6. The method of claim 5 further comprising:

performing frequency hopping between the initial grant-free transmission and at least one of the at least one grant-free retransmission.

7. The method of claim 5, wherein:

the configured first number of uplink grant-free transmissions is determined based on a reliability mode of the UE.

8. The method of claim 5, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a pilot.

19. The method of claim 5, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a signature.

20. The method of claim 8, wherein:

each CTU access region is further defined by a signature.

9. A base station comprising:

a processor; and

a non-transitory computer-readable memory storing thereon instructions that, when executed, cause the processor to;

map a first user equipment (UE) for uplink grant-free transmission to first time-frequency regions of a frequency partition; and

configure the first UE, using high-level signaling, to perform a configured first number of uplink grant-free transmissions including an initial grant-free transmission and at least one grant-free retransmission irrespective of whether the initial grant-free transmission was successfully received, using time-frequency regions indicated by said mapping.

10. The base station of claim 9, wherein the instructions, when executed, further cause the processor to:

configure the first UE to perform frequency hopping between the initial grant-free transmission and at least one of the at least one grant-free retransmission.

11. The base station of claim 9, wherein:

the configured first number of uplink grant-free transmissions is determined based on a reliability mode of the first UE.

12. The base station of claim 9, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a pilot.

21. The base station of claim 9, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a signature.

22. The base station of claim 12, wherein:

each CTU access region is further defined by a signature.

13. A user equipment (UE), comprising:

a processor; and

a non-transitory computer-readable memory storing thereon instructions that, when executed, cause the processor to;

receive, by high-level signaling, a mapping of the UE for uplink grant-free transmission to first time-frequency regions of a frequency partition; and

perform a configured first number of uplink grant-free transmissions including an initial grant-free transmission and at least one grant-free retransmission irrespective of whether the initial grant-free transmission was successfully received, using time-frequency regions indicated by said mapping.

14. The UE of claim 13 wherein the instructions, when executed, further cause the processor to:

perform frequency hopping between the initial grant-free transmission and at least one of the at least one grant-free retransmission.

15. The UE of claim 13, wherein:

the configured first number of uplink grant-free transmissions is determined based on a reliability mode of the UE.

16. The UE of claim 13, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a pilot.

23. The UE of claim 13, wherein:

each first time-frequency region is a contention transmission unit (CTU) access region further defined by a signature.

24. The UE of claim 16, wherein:

each CTU access region is further defined by a signature.