Systems and methods for the coexistence of differing cyclic prefix lengths

• US 10,700,904 B2
• Filed: 02/10/2017
• Issued: 06/30/2020
• Est. Priority Date: 09/16/2016
• 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: Salem, Mohamed Adel, Islam, Toufiqul, Ma, Jianglei, Au, Kelvin Kar Kin
• Primary Examiner(s): Abelson, Ronald B
• Application Number:
  US15/430,050
• Publication Number:
  US 20180083817A1
• Time in Patent Office: 1,236 Days
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource

Abstract

Systems and methods of transmitting using different cyclic prefix types are provided. In some embodiments, the cyclic prefix type used changes on a per time interval based on characteristics of the traffic. In some embodiments, different cyclic prefix types are used simultaneously during a time interval for different traffic types.

Claims

1. A method comprising:

during a first time interval, transmitting a signal including a first traffic in a first time-frequency region of the first time interval with a first cyclic prefix and a second traffic in a second time-frequency region of the first time interval with a second cyclic prefix, a length of the first cyclic prefix in the first traffic being different than a length of the second cyclic prefix in the second traffic, the first traffic sent over a downlink portion of a first self-contained sub-frame that includes a downlink portion, a guard period, and an uplink portion, the second traffic sent over a downlink portion of a second self-contained sub-frame that includes a downlink portion, a guard period, and an uplink portion, the second self-contained sub-frame being different than the first self-contained sub-frame,

wherein the guard period of the first self-contained sub-frame is at least partially aligned with the guard period of the second self-contained sub-frame such that the uplink portion of the first self-contained sub-frame does not overlap in the time-domain with the downlink portion of the second self-contained sub-frame.

2. The method of claim 1, wherein the first traffic is sent with a sub-carrier spacing that is the same as that for the second traffic.

3. The method of claim 1, wherein the first traffic is sent with a sub-carrier spacing that is different from that for the second traffic.

4. The method of claim 1, further comprising:

setting the length of the first cyclic prefix in the first traffic and the length of the second cyclic prefix in the second traffic based at least in part on characteristics of the first traffic and the second traffic, respectively.

5. The method of claim 4, wherein the length of the first cyclic prefix in the first traffic and the length of the second cyclic prefix in the second traffic is based on at least one of:

modulation and coding schemes used for the first traffic and the second traffic, respectively;

payloads of the first traffic and the second traffic, respectively; and

bandwidth allocated to the first traffic and the second traffic, respectively.

6. The method of claim 4, wherein the first traffic is ultra-reliable low latency communications (URLLC) traffic and the second traffic is enhanced mobile broadband (eMBB) traffic.

7. The method of claim 4, wherein each cyclic prefix is one of normal cyclic prefix (NCP) and ECP (extended cyclic prefix).

8. The method of claim 1, wherein transmitting the signal during the first time interval comprises:

transmitting, during at least part of the first time interval, traffic of multiple different traffic types, inclusive of the first traffic, all of which having the same length cyclic prefix as the first traffic; and

transmitting, during at least part of the first time interval, traffic of multiple different traffic types, inclusive of the second traffic, all of which having the same length cyclic prefix as the second traffic.

9. The method of claim 8, wherein the first traffic is sent with a sub-carrier spacing that is the same as that for the second traffic.

10. The method of claim 8, wherein the first traffic is sent with a sub-carrier spacing that is different from that for the second traffic.

11. A method comprising:

receiving, by a user equipment (UE), first traffic within a first time-frequency region using a first cyclic prefix type and/or first sub-carrier spacing, wherein the first time-frequency region at least partially overlaps in an area of overlap with a second time-frequency region originally scheduled for second traffic using a second cyclic prefix type and/or second sub-carrier spacing, and traffic within the second time-frequency region is punctured in the area of overlap between the first time-frequency region and the second time-frequency region; and

at a time after transmission of scheduling information in respect of the second traffic within the second time frequency region, receiving an indication of the first traffic within the first time-frequency region.

12. The method of claim 11, wherein the first traffic is ultra-reliable low latency communications (URLLC) traffic and the second traffic is enhanced mobile broadband (eMBB) traffic.

13. The method of claim 11, wherein each cyclic prefix type is one of normal cyclic prefix (NCP) and ECP (extended cyclic prefix).

14. The method of claim 11 further comprising:

transmitting an indication message to a network indicating support by the UE for one or more cyclic prefix lengths for each of at least one supported sub-carrier spacing.

15. A user equipment (UE) comprising:

at least one receive chain, each receive chain comprising a sub-carrier de-mapper, an FFT, and a pilot symbol and cyclic prefix processor, each receive chain operating with a respective sub-carrier spacing and a respective cyclic prefix type;

the UE configured to receive first traffic within a first time-frequency region using a first cyclic prefix type and/or first sub-carrier spacing, wherein the first time-frequency region overlaps in an area of overlap with a second time-frequency region originally scheduled for second traffic using a second cyclic prefix type and/or second sub-carrier spacing, and traffic within the second time-frequency region is punctured in the area of overlap between the first time-frequency region and the second time-frequency region; and

the UE further configured to receive, at a time after transmission of scheduling information in respect of the second traffic within the second time frequency region, an indication of the first traffic within the first time-frequency region.

16. The UE of claim 15, wherein the first traffic is ultra-reliable low latency communications (URLLC) traffic and the second traffic is enhanced mobile broadband (eMBB) traffic.

17. The UE of claim 15, wherein each cyclic prefix type is one of normal cyclic prefix (NCP) and ECP (extended cyclic prefix).

18. The UE of claim 15, the UE further configured to transmit an indication message to a network indicating support by the UE for one or more cyclic prefix lengths for each of at least one supported sub-carrier spacing.

19. A base station comprising:

at least two transmit chains, each transmit chain comprising a sub-carrier mapper and grouper, an IFFT, and a pilot symbol and cyclic prefix inserter, each transmit chain operating with a respective sub-carrier spacing and a respective cyclic prefix length, first transmit chain of the at least two transmit chains configured to transmit, during a first time interval, first traffic in a first time-frequency region over a downlink portion of a first self-contained sub-frame that includes a downlink portion, a guard period and an uplink portion, a second transmit chain of the at least two transmit chains configured to transmit, during the first time interval, second traffic in a second time-frequency region over a downlink portion of a second self-contained sub-frame that includes a downlink portion, a guard period and an uplink portion, the second self-contained sub-frame being different than the first self-contained sub-frame, a length of a first cyclic prefix in the first traffic being different than a length of a second cyclic prefix in the second traffic,

wherein the guard period of the first self-contained sub-frame is at least partially aligned with the guard period of the second self-contained sub-frame such that the uplink portion of the first self-contained sub-frame does not overlap in the time-domain with the downlink portion of the second self-contained sub-frame.

20. The base station of claim 19, wherein the first transmit chain further operates to transmit, during at least part of the first time interval, traffic of multiple different traffic types, inclusive of the first traffic, all of which having the same length cyclic prefix as the first traffic, and

wherein the second transmit chain further operates to transmit, during at least part of the first time interval, traffic of multiple different traffic types, inclusive of the second traffic, all of which having the same length cyclic prefix as the second traffic.

21. The base station of claim 20, wherein the first transmit chain operates with a sub-carrier spacing that is the same as that of the second transmit chain.

22. The base station of claim 20, wherein the first transmit chain operates with a sub-carrier different from that of the second transmit chain.