Grant-free transmission method, user equipment and base station

Patent metadata

Field	Value
Publication number	US-11310839-B2
Application number	US-201816495661-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Mar 20, 2017
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

The present disclosure provides a grant-free transmission method, a user equipment, and a base station. The grant-free transmission method at a user equipment side includes: step a, sending a first multiple access signature selected by a user equipment to a base station; step b, receiving an intervention result of the base station for the user equipment; step c, determining, when the intervention result is to adopt the first multiple access signature, to adopt the first multiple access signature for data transmission; and step d, determining, when the intervention result is to adopt a second multiple access signature, to adopt the second multiple access signature for the data transmission. According to the grant-free transmission method, the user equipment, and the base station provided by the present disclosure, the collision during the grant-free transmission is avoided or reduced with less signaling overhead.

First claim

The invention claimed is:

1. A grant-free transmission method, comprising:
step a, sending a first multiple access signature selected by a user equipment to a base station;
step b, receiving an intervention result of the base station for the user equipment;
step c, determining, in response to that the intervention result is to adopt the first multiple access signature, to adopt the first multiple access signature for data transmission; and
step d, determining, in response to that the intervention result is to adopt a second multiple access signature, to adopt the second multiple access signature for the data transmission;
wherein the step a comprises:
sending the first multiple access signature to the base station through a random access request; and
the step a further comprises:
selecting, according to predefined correspondence between indexes of multiple access signatures and combinations of physical resources used by random access requests, and at least one of preamble indexes or IDs of user equipments, a first combination from more than one combination corresponding to an index of the first multiple access signature;
including, in the random access request, at least one of a preamble corresponding to a preamble index in the first combination or an ID of the user equipment in the first combination; and
sending the random access request to the base station using a physical resource in the first combination.

2. The method of claim 1 , wherein the step a comprises:
including an index of the first multiple access signature into the random access request.

3. The method of claim 1 , wherein the step a comprises:
selecting, according to predefined correspondence between first parts of indexes of multiple access signatures and combinations of physical resources used by random access requests, and at least one of preamble indexes or IDs of user equipments, a first combination from more than one combination corresponding to a first part of an index of the first multiple access signature;
including, in the random access request, at least one of a preamble corresponding to a preamble index in the first combination or an ID of the user equipment in the first combination, and a second part of the index of the first multiple access signature; and
sending the random access request to the base station using a physical resource in the first combination.

4. The method of claim 1 ,
wherein the step b comprises:
receiving the intervention result of the base station for the user equipment through a random access response;
wherein the step d comprises:
acquiring the second multiple access signature through the random access response.

5. The method of claim 4 , wherein the step d comprises:
determining, according to predefined correspondence between indexes of multiple access signatures and physical resources used by random access responses, an index of a multiple access signature corresponding to a physical resource used by the received random access response as an index of the second multiple access signature; and
acquiring the second multiple access signature according to the index of the second multiple access signature.

6. The method of claim 4 , wherein the step d comprises:
calculating an index of the second multiple access signature, according to an index of the first multiple access signature and an offset between the index of the second multiple access signature and the index of the first multiple access signature included in the received random access response; and
acquiring the second multiple access signature according to the index of the second multiple access signature.

7. A grant-free transmission method, comprising:
step A, receiving, from respective user equipments, first multiple access signatures selected by the respective user equipments;
step B, predicting mutual interference caused by data transmission performed simultaneously by the respective user equipments using the first multiple access signatures of the respective user equipments, determining a respective user equipment of which mutual interference is predicted to be higher than a predetermined level as a user equipment to be intervened, and determining, for a respective user equipment of which mutual interference is predicted to be not higher than the predetermined level, that to adopt a first multiple access signature of the respective user equipment of which the mutual interference is predicted to be not higher than the predetermined level is an intervention result for the respective user equipment of which the mutual interference is predicted to be not higher than the predetermined level;
step C, for a respective user equipment to be intervened, selecting a multiple access signature capable of making the mutual interference not higher than the predetermined level as a second multiple access signature of the respective user equipment to be intervened, and determining that to adopt the second multiple access signature is an intervention result for the respective use equipment to be intervened; and
step D, sending intervention results for the respective user equipments.

8. The method of claim 7 , wherein the step A comprises:
receiving the first multiple access signatures of the respective user equipments through random access requests sent by the respective user equipments.

9. The method of claim 8 , wherein the step A comprises:
for a respective user equipment, determining, according to predefined correspondence between indexes of multiple access signatures and combinations of physical resources used by random access requests, and at least one of preamble indexes or IDs of user equipments, an index of a multiple access signature corresponding to a combination of a physical resource used by a random access request sent by the respective user equipment, and at least one of a preamble index included in the random access request or an ID of a user equipment included in the random access request, as an index of the first multiple access signature of the respective user equipment, and acquiring the first multiple access signature of the respective user equipment according to the index of the first multiple access signature of the respective user equipment.

10. The method of claim 8 , wherein the step A comprises:
acquiring, for a respective user equipment, a first multiple access signature of the respective user equipment according to an index of the first multiple access signature of the respective user equipment included in a random access request sent by the respective user equipment.

11. The method of claim 8 , wherein the step A comprises:
for a respective user equipment, determining, according to predefined correspondence between first parts of indexes of multiple access signatures and combinations of physical resources used by random access requests, and at least one of preamble indexes or IDs of user equipments, a first part of an index of a multiple access signature corresponding to a combination of a physical resource used by a random access request sent by the respective user equipment, and at least one of a preamble index included in the random access request or an ID of a user equipment included in the random access request, as a first part of an index of the first multiple access signature of the respective user equipment;
combining the first part of the index of the first multiple access signature with a second part of the index of the first multiple access signature included in the random access request sent by the respective user equipment to obtain the index of the first multiple access signature of the respective user equipment; and
acquiring the first multiple access signature of the

Assignees

• Ntt Docomo Inc

Inventors

• Ye Neng
• Li Xiangming
• Chen Xiaohang
• Hou Xiaolin
• Zhao Qun
• Jiang Huiling

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04W74/0833

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

• H04W74/0836

  with 2-step access · CPC title

• H04W74/002 Primary

  Transmission of channel access control information · CPC title

• H04W74/004

  in the uplink, i.e. towards network · CPC title