Sequence selection for non-orthogonal multiple access transmissions

Patent metadata

Field	Value
Publication number	US-11375550-B2
Application number	US-202016908525-A
Country	US
Kind code	B2
Filing date	Jun 22, 2020
Priority date	Dec 22, 2017
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

Optimizing the resource configuration or selection for grant-free contention-based non-orthogonal multiple access (NOMA) transmissions is an effective way to increase network capacity and reduce multi-user interference at the user equipment (UE). In some embodiments, a network node may determine the current traffic load, select multiple access (MA) sequences for the UE based on the determination, and transmit this selection to the UE for subsequent transmissions. In other embodiments, the UE may receive a message with an indication of the traffic load being experienced by the base station that the UE is attempting to connect to, and then may randomly select an MA sequence for subsequent transmissions.

First claim

What is claimed is:

1. A method for wireless communication implemented at a network node, the method comprising:
generating statistics indicative of a current traffic load at the network node, wherein the statistics comprise a quantity of user devices communicatively connected to the network node, and an average number of user devices sharing a same resource or an equivalent average traffic arrival rate;
selecting a multiple access (MA) signature for a user device based on the statistics, wherein the MA signature is used to receive a contention-based transmission; and
transmitting a message indicative of the MA signature.

2. The method of claim 1 , wherein the generating the statistics comprises:
determining a number of user devices that are initiating uplink transmissions;
periodically generating the statistics; or
receiving a trigger for an event and determining the statistics in response to the trigger.

3. The method of claim 2 , wherein the message is transmitted to cause at least one of the number of user devices to initiate the uplink transmission in response to receiving the message.

4. The method of claim 1 , wherein the transmitting the message comprises:
communicating the message using radio resource control signaling;
broadcasting the message; or
group-common signaling the message.

5. The method of claim 1 , wherein the selecting the MA signature comprises:
selecting the MA signature from at least one set of MA signature sequences.

6. The method of claim 5 , wherein a size of the at least one set of MA signature sequences is based on the statistics indicative of the current traffic load at the network node, and wherein the at least one set of MA signature sequences is predefined and known to the user device.

7. The method of claim 1 , wherein the selecting the MA signature comprises:
randomly selecting the MA signature from at least one set of MA signature sequences, wherein the randomly selecting the MA signature is based on at least one random distribution and associated random distribution parameters.

8. A method for wireless communication implemented at a user device, the method comprising:
receiving a message from a network node, wherein the message includes statistics indicative of a current traffic load at the network node, wherein the statistics comprise a quantity of user devices communicatively connected to the network node, and an average number of user devices sharing a same resource or an equivalent average traffic arrival rate;
selecting a multiple access (MA) signature based on the message; and
performing a contention-based transmission to the network node using the MA signature.

9. The method of claim 8 , wherein the message is received via:
radio resource control signaling;
group-common signaling; or
broadcast signaling.

10. The method of claim 8 , wherein selecting the MA signature comprises:
selecting the MA signature from at least one set of MA signature sequences, wherein a size of the at least one set of MA signature sequences is based on the indication of the current traffic load at the network node.

11. The method of claim 10 , wherein the at least one set of MA signature sequences is predefined and known to the user device.

12. The method of claim 8 , wherein selecting the MA signature comprises:
randomly selecting the MA signature from at least one set of MA signature sequences.

13. The method of claim 12 , wherein the randomly selecting the MA signature is based on at least one random distribution and associated random distribution parameters.

14. The method of claim 13 , wherein the at least one random distribution comprises one or more of a uniform distribution, an exponentially decaying distribution, and a log-normal distribution.

15. The method of claim 8 , wherein the statistics indicative of the current traffic load further comprise an average number of user devices sharing a same resource or an equivalent average traffic arrival rate.

16. A network node apparatus comprising:
at least one processor and memory containing instructions that when executed perform operations comprising:
generating statistics indicative of a current traffic load at the network node, wherein the statistics comprise a quantity of user devices communicatively connected to the network node, and an average number of user devices sharing a same resource or an equivalent average traffic arrival rate;
selecting a multiple access (MA) signature for a user device based on the statistics, wherein the MA signature is used to receive a contention-based transmission; and
transmitting a message indicative of the MA signature.

17. The apparatus of claim 16 , wherein the generating the statistics comprises:
determining a number of user devices that are initiating uplink transmissions;
periodically generating the statistics; or
receiving a trigger for an event and determining the statistics in response to the trigger.

18. The apparatus of claim 16 , wherein the transmitting the message comprises:
communicating the message using radio resource control signaling;
broadcasting the message; or
group-common signaling the message.

19. The apparatus of claim 16 , wherein the statistics indicative of the current traffic load further comprise an average number of user devices sharing a same resource or an equivalent average traffic arrival rate.

20. An apparatus included at a user device, the apparatus comprising:
at least one processor and memory containing instructions that when executed perform operations comprising:
receiving a message from a network node, wherein the message includes statistics indicative of a current traffic load at the network node, wherein the statistics comprise a quantity of user devices communicatively connected to the network node, and an average number of user devices sharing a same resource or an equivalent average traffic arrival rate;
selecting a multiple access (MA) signature based on the message; and
performing a contention-based transmission to the network node using the MA signature.

21. The apparatus of claim 20 , wherein the message is received via:
radio resource control signaling;
group-common signaling; or
broadcast signaling.

22. The apparatus of claim 20 , wherein the selecting the MA signature comprises:
randomly selecting the MA signature from at least one set of MA signature sequences, wherein the randomly selecting the MA signature is based on at least one random distribution and associated random distribution parameters.

Assignees

• Zte Corp

Inventors

• Tian Li
• Cao Wei
• Wang Sha
• Yuan Yifei
• Yuan Zhifeng

Classifications

• H04W76/27 Primary

  Transitions between radio resource control [RRC] states · CPC title

• H04J13/16 Primary

  Code allocation · CPC title

• H04W4/06

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H04L41/142

  using statistical or mathematical methods · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title