CN111211880A

CN111211880A - Uplink non-orthogonal multiple access transmission feedback method, device and system

Info

Publication number: CN111211880A
Application number: CN201811391196.6A
Authority: CN
Inventors: 沈霞; 闫志宇
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-05-29
Anticipated expiration: 2038-11-21
Also published as: CN111211880B

Abstract

The application provides a feedback method, a device and a system for uplink non-orthogonal multiple access transmission.A base station feeds back a group-based common control signaling to UE according to a detection result and feeds back a special control signaling of the UE to the UE with the same detection result and less UE number in the group respectively, so that the UE detects the special control signaling for the UE and performs new transmission or retransmission according to a feedback result indicated by the special control signaling when the feedback result exists; otherwise, carrying out new transmission or retransmission according to the detected feedback result indicated by the common control signaling based on the group where the UE is located; wherein, the detection result for one group in the common control signaling is the detection result corresponding to the UE with the same number of detection results in the group; and the detection result in the special control signaling is the detection result of the corresponding UE. The method can improve the transmission efficiency of the system on the basis of saving signaling overhead.

Description

Uplink non-orthogonal multiple access transmission feedback method, device and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a feedback method, apparatus, and system for uplink non-orthogonal multiple access transmission.

Background

Non-orthogonal multiple access (NOMA) gains in the number of connections and increases the spectral efficiency of the system by superimposing data for multiple Users (UEs) on the same time-frequency resource. In uplink NOMA transmission, a plurality of UEs use the same time-frequency resource to send data to the base station, the base station side detects a plurality of user data in one time-frequency resource at the same time, and feeds back the detection result, i.e. Acknowledgement (ACK)/non-acknowledgement (NACK), to the user to indicate the user to perform new transmission or retransmission.

In the uplink non-orthogonal multiple access transmission feedback, if the traditional ACK/NACK feedback based on UE specific is adopted, a large amount of feedback overhead is introduced.

In order to save the feedback signaling overhead, the existing standard adopts the technology of ACK/NACK bundling/multiplexing.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating bundling ACK/NACK feedback in a conventional implementation. In fig. 1, the transmission feedback signaling of multiple subframes of each codeword of the same user is logically and-operated by bundling to be combined into one signaling for feedback.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating multiplexing ACK/NACK feedback in a conventional implementation. In fig. 2, multiple codewords of each frame of the same user are logically and-combined into one bit signaling through multiplexing, and the multiplexing results of multiple subframes are fed back in the same subframe.

Although the two feedback modes save signaling overhead, the feedback for each user is not timely enough, and the transmission efficiency of the system is low.

Disclosure of Invention

In view of this, the present application provides a feedback method, apparatus and system for uplink non-orthogonal multiple access transmission, which can improve the transmission efficiency of the system on the basis of saving signaling overhead.

In order to solve the technical problem, the technical scheme of the application is realized as follows:

an uplink non-orthogonal multiple access transmission feedback method, comprising:

detecting data transmitted by the UEs in each group;

feeding back a group-based common control signaling to the UE according to the detection result, and feeding back a dedicated control signaling of the UE to the UE with the same detection result and less UE number in the group respectively, so that the UE detects the dedicated control signaling for the UE, and performs new transmission or retransmission according to the feedback result indicated by the dedicated control signaling when the feedback result exists; otherwise, carrying out new transmission or retransmission according to the detected feedback result indicated by the common control signaling based on the group where the UE is located;

wherein, the detection result for one group in the common control signaling is the detection result corresponding to the UE with the same number of detection results in the group; and the detection result in the special control signaling is the detection result of the corresponding UE.

An uplink non-orthogonal multiple access transmission feedback apparatus, the apparatus comprising: a detection unit and a feedback unit;

the detection unit is used for detecting data transmitted by the UE in each group;

the feedback unit is used for feeding back a group-based common control signaling to the UE according to the detection result of the detection unit, and feeding back a special control signaling of the UE to the UE with the same detection result and less UE number in the group respectively, so that the UE detects the special control signaling for the UE, and when the feedback result exists, new transmission or retransmission is carried out according to the feedback result indicated by the special control signaling; otherwise, carrying out new transmission or retransmission according to the detected feedback result indicated by the common control signaling based on the group where the UE is located; wherein, the detection result for one group in the common control signaling is the detection result corresponding to the UE with the same number of detection results in the group; and the detection result in the special control signaling is the detection result of the corresponding UE.

An uplink non-orthogonal multiple access transmission feedback system, the system comprising:

a base station for detecting data transmitted by the UEs in each group; feeding back a group-based common control signaling to the UE according to the detection result, and feeding back a UE dedicated control signaling to the UE with the same detection result and less UE in the group; wherein, the detection result for one group in the common control signaling is the detection result corresponding to the UE with the same number of detection results in the group; the detection result in the special control signaling is the detection result of the corresponding UE;

the UE is used for detecting the feedback signaling; when the special control signaling for the UE is detected and a feedback result exists, performing new transmission or retransmission according to the feedback result indicated by the special control signaling; otherwise, new transmission or retransmission is carried out according to the detected feedback result indicated by the common control signaling based on the group where the UE is located.

According to the technical scheme, the group-based common control signaling is fed back to the terminal according to the detection result, and the special control signaling of the UE is respectively fed back to the UE with the same detection result and less UE number in the group, so that the UE detects the special control signaling for the UE, and when the feedback result exists, new transmission or retransmission is carried out according to the feedback result indicated by the special control signaling; otherwise, new transmission or retransmission is carried out according to the detected feedback result indicated by the common control signaling based on the group where the UE is located. The scheme can improve the transmission efficiency of the system on the basis of saving signaling overhead.

Drawings

FIG. 1 is a diagram illustrating bundling ACK/NACK feedback in a conventional implementation;

FIG. 2 is a diagram illustrating multiplexing ACK/NACK feedback in a conventional implementation;

fig. 3 is a schematic diagram of an uplink non-orthogonal multiple access transmission feedback system according to an embodiment of the present application;

FIG. 4 is a diagram illustrating an ACK/NACK signaling format based on group feedback;

FIG. 5 is a schematic diagram of group common control signaling transmission;

FIG. 6 is a diagram illustrating group specific control signaling transmission;

FIG. 7 is a schematic diagram illustrating an uplink non-orthogonal multiple access transmission feedback process according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.

The embodiment of the application provides an uplink non-orthogonal multiple access transmission feedback system which is applied to a synchronous HARQ mechanism. Referring to fig. 3, fig. 3 is a schematic diagram of an uplink non-orthogonal multiple access transmission feedback system in the embodiment of the present application. The system comprises a base station and a UE. In fig. 3, for example, one base station corresponds to K UEs, and in practical application, the number of UEs and the number of base stations are determined according to a practical scenario.

In the embodiment of the present application, a base station groups NOMA UEs in advance, and for convenience of description, NOMA UEs are simply referred to as UEs.

When the time frequency resources are divided into different groups, the time frequency resources occupied by the UEs in different groups are orthogonal.

In practical application, for supporting transmission requirements of different scenarios, NOMA divides a plurality of resource pools, and each resource pool adopts different transmission configurations (different configurations such as RB number, MCS, HARQ retransmission times, spreading length, etc.). The base station side may correspond one resource pool to one group. At this time, the group ID of each group corresponds to the resource pool ID, and at this time, the UE knows the resource pool ID from the control signaling, that is, knows the packet ID corresponding to its transmission. If the resource pool ID does not have a correspondence with the group ID of the divided group, the control signaling needs to include the group ID and notify the UE.

The base station detects data transmitted by the UE in each group;

the base station feeds back a group-based common control signaling to the UE according to the detection result, and respectively feeds back a special control signaling of the UE to the UE with the same detection result and less UE number in the group;

In specific implementation, if the UE receives the UE-specific control signaling in advance within a feedback receiving time range and the dedicated control signaling has a feedback result, only the UE-specific control signaling needs to be detected without detecting the common control signaling of the group where the UE is located;

if the UE receives the special control signaling and the public control signaling within a feedback receiving time range and a feedback result exists in the special control signaling, the feedback result indicated by the special control signaling is used for new transmission or retransmission;

and if the UE only receives the common control signaling and does not receive the special control signaling in a feedback receiving time range, selecting a feedback result indicated by the common control signaling to transmit the new data or retransmit the new data.

When the number of the UE with the same detection result in the group is the same, the detection result of the group in the public control signaling is the detection result corresponding to any UE in the group; the detection result in the dedicated control signaling is a detection result of the UE which is different from the group of detection results in the common control signaling.

That is, the number of UEs whose detection results are NACK and ACK is the same, the detection result may be carried in the common control signaling as NACK or ACK;

and when the common control signaling carries the NACK detection result, respectively sending the special control signaling of the UE aiming at the UE of which the detection result is ACK.

And when the common control signaling carries the ACK detection result, respectively sending the special control signaling of the UE aiming at the UE of which the detection result is NACK.

When the base station feeds back the group-based common control signaling to the UE according to the detection result and respectively feeds back the dedicated control signaling of the UE to the UE with the same number of UEs in the group, the method comprises the following steps:

counting the number M of UE with the detection result of ACK in the group and the number N of UE with the detection result of NACK;

when M is determined to be larger than N, the detection result based on the group in the common control signaling fed back to the UE is ACK, and the detection result in the corresponding special control signaling of the UE fed back to the UE with the NACK detection result is NACK;

and when M is determined to be smaller than N, the detection result based on the group in the common control signaling fed back to the UE is NACK, and the detection result in the special control signaling corresponding to the UE, which is fed back to the UE with the ACK detection result, is ACK.

And when M is equal to N, the detection result based on the group in the common control signaling fed back to the UE is ACK or NACK, and the detection result in the special control signaling of the corresponding UE fed back to the UE with the detection result of NACK or ACK is NACK or ACK.

The common control signaling sent by the base station in the embodiment of the present application may have two implementation manners: group common control signaling, or group dedicated control signaling;

there are two implementations of the content carried:

the first method comprises the following steps: and when the common control signaling is a group common control signaling, the detection results of all groups are contained in the same common control signaling. That is, multiple groups feed back corresponding to a common control signaling.

Referring to fig. 4, fig. 4 is a diagram illustrating an ACK/NACK signaling format based on group feedback. In fig. 4, the detection results of N groups are fed back to the users corresponding to the N groups using the same common control signaling, and the UEs in the N groups can all analyze the common control signaling to obtain the detection results corresponding to the group.

In a specific implementation, a detection result of 1 bit may be generated for each group, and if the detection result is ACK, the value is 1, and if the feedback result is ACK, the value is 0. In this embodiment, the present invention is not limited to this embodiment.

Referring to fig. 5, fig. 5 is a schematic diagram of group common control signaling transmission. The group common control signaling may be transmitted using resources carrying the common control signaling, and the UEs in each group receive the feedback signaling at the same time.

Second, when the common control signaling is a group-specific control signaling, only the group detection result of the group is included. That is, each group feeds back a dedicated control signaling.

That is, each common control signaling only carries the detection result of one group of UE, and the detection results of different groups are carried in different common control signaling and fed back to the UE.

Referring to fig. 6, fig. 6 is a diagram illustrating group-specific control signaling transmission. The group dedicated control signaling is scrambled by using a group ID, the group dedicated control signaling is transmitted by using resources bearing the dedicated control signaling, and the UE of each group only receives the dedicated control signaling corresponding to the group in which the UE is located based on the group ID.

In the embodiment of the application, the detection result carried by the common control signaling is a group-based detection result, and the group detection result is a detection result corresponding to the UE with the same detection result and the number of UEs; the dedicated control signaling carries the detection result based on one UE.

The method and the device are applied to a synchronous HARQ mechanism, namely, the HARQ process number of a transmission subframe corresponding to a feedback subframe is known. And the UE performs new transmission or retransmission corresponding to the corresponding HARQ process according to the feedback result.

Based on the same inventive concept, the embodiment of the application also provides an uplink non-orthogonal multiple access transmission feedback method.

The base station groups the UE in advance, the UE in the same group occupies the same time frequency resource, and the occupied time frequency resources in different groups are orthogonal; and assigns a globally unique group ID for each group and informs the UE.

Referring to fig. 7, fig. 7 is a schematic diagram of a feedback process of uplink non-orthogonal multiple access transmission in the embodiment of the present application. The method comprises the following specific steps:

in step 701, the base station detects data transmitted by the UEs in each group.

Step 702, the base station feeds back a group-based common control signaling to the UEs according to the detection result, and feeds back dedicated control signaling of the UEs to the UEs with the same number of UEs in the group, so that the UEs detect the dedicated control signaling for the UEs, and perform new transmission or retransmission according to the feedback result indicated by the dedicated control signaling when the feedback result exists; otherwise, new transmission or retransmission is carried out according to the detected feedback result indicated by the common control signaling based on the group where the UE is located.

In step 702, feeding back a group-based common control signaling to the UEs according to the detection result, and feeding back dedicated control signaling of the UEs to the UEs with the same number of UEs in the group, respectively, includes:

The common control signaling is a group common control signaling or a group dedicated control signaling;

when the common control signaling is a group common control signaling, the detection results of all groups are contained in the same common control signaling; that is, a plurality of groups feed back corresponding to a common control signaling;

when the common control signaling is a group dedicated control signaling, only the group detection result of the group is included; that is, each group feeds back a dedicated control signaling.

Based on the same inventive concept, the embodiment of the present application further provides an uplink non-orthogonal multiple access transmission feedback device, which is applied to a base station. Referring to fig. 8, fig. 8 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device includes: a detection unit 801 and a feedback unit 802;

a detecting unit 801, configured to detect data transmitted by UEs in each group;

a feedback unit 802, configured to feed back a group-based common control signaling to the UE according to the detection result of the detection unit 801, and feed back dedicated control signaling of the UE to the UEs with the same number of detection results in the group, so that the UE detects the dedicated control signaling for the UE, and performs new transmission or retransmission according to a feedback result indicated by the dedicated control signaling when the feedback result exists; otherwise, carrying out new transmission or retransmission according to the detected feedback result indicated by the common control signaling based on the group where the UE is located; wherein, the detection result for one group in the common control signaling is the detection result corresponding to the UE with the same number of detection results in the group; and the detection result in the special control signaling is the detection result of the corresponding UE.

Preferably, the first and second liquid crystal films are made of a polymer,

the detecting unit 801 is specifically configured to, when feeding back a group-based common control signaling to a UE according to a detection result and feeding back a dedicated control signaling of the UE to UEs with the same number of UEs as the detection result in the group, respectively, the detecting unit includes: counting the number M of UE with the detection result of ACK in the group and the number N of UE with the detection result of NACK; when M is determined to be larger than N, the detection result based on the group in the common control signaling fed back to the UE is ACK, and the detection result in the corresponding special control signaling of the UE fed back to the UE with the NACK detection result is NACK; and when M is determined to be smaller than N, the detection result based on the group in the common control signaling fed back to the UE is NACK, and the detection result in the special control signaling corresponding to the UE, which is fed back to the UE with the ACK detection result, is ACK.

Preferably, the first and second liquid crystal films are made of a polymer,

when the common control signaling is a group common control signaling, the detection results of all groups are contained in the same common control signaling;

and when the common control signaling is the group-dedicated control signaling, only the group detection result of the group is included.

The device further comprises a configuration unit, which is used for grouping the UE, wherein the UE in the same group occupies the same time-frequency resource, and the time-frequency resources occupied by different groups are orthogonal; a globally unique group ID is assigned for each group and the UE is notified.

The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.

To sum up, in the embodiment of the present application, by transmitting feedback for an uplink NOMA, a plurality of users borne on the same time-frequency resource are taken as a group, and ACK/NACK feedback is performed based on the group, that is, results detected by the plurality of users are combined into a bit ACK/NACK signaling, and if an actual detection result for a certain UE is different from a combination result, the UE-based ACK/NACK signaling is separately fed back for the UE. In order to further save signaling overhead, the group-based ACK/NACK value is adopted, wherein the number of the detected users is the same as that of the detected users, and the corresponding ACK/NACK value is larger than that of the detected users, namely the detected users in the same group are not less than that of the detected users with the NACK result, the ACK is fed back aiming at the group, and the NACK is fed back aiming at the group otherwise. And for the feedback result, the UE preferentially takes the ACK/NACK feedback signaling based on the UE as the feedback result, and if not, takes the ACK/NACK feedback signaling based on the group in which the UE is positioned as the feedback result.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An uplink non-orthogonal multiple access transmission feedback method is characterized in that, the method comprises:

Detect data transmitted by UEs in each group;

According to the detection result, the group-based common control signaling is fed back to the UE, and the UE's dedicated control signaling is fed back to the UEs with the same detection result and a small number of UEs respectively, so that the UE detects the dedicated control signaling for the UE and exists When the result is fed back, new transmission or retransmission is performed according to the feedback result indicated by the dedicated control signaling; otherwise, new transmission or retransmission is performed according to the detected feedback result indicated by the common control signaling of the group where the UE is located;

Wherein, the detection result for a group in the common control signaling is the detection result corresponding to the UE with the same detection result and many UEs in the group; the detection result in the dedicated control signaling is the detection result of the corresponding UE.

2. The method according to claim 1, wherein the method further comprises:

When the number of UEs with the same detection result in the group is the same, the detection result of the group in the common control signaling is the detection result corresponding to any UE in the group; the detection result in the dedicated control signaling is the same as that of the public control signaling. In the control signaling, the detection results of the group of UEs with different detection results.

3 . The method according to claim 1 , wherein the group-based common control signaling is fed back to the UE according to the detection result, and the dedicated control signaling of the UE is respectively fed back to the UE with the same detection result and a small number of UEs in the group. 4 . order, including:

Count the number M of UEs whose detection result is ACK in the group, and the number N of UEs whose detection result is NACK;

When it is determined that M is greater than N, the detection result based on the group in the common control signaling fed back to the UE is ACK, and the detection result in the corresponding dedicated control signaling of the UE fed back to the UE whose detection result is NACK is NACK;

When it is determined that M is less than N, the detection result based on the group in the common control signaling fed back to the UE is NACK, and the detection result in the dedicated control signaling corresponding to the UE fed back to the UE whose detection result is ACK is ACK.

4. The method according to claim 1, wherein the common control signaling is group common control signaling or group dedicated control signaling;

When the common control signaling is group common control signaling, the detection results of all groups are included in the same common control signaling;

When the common control signaling is group-specific control signaling, only the group detection result of the group is included.

5. The method according to any one of claims 1-4, wherein the method further comprises:

The UEs are grouped, the UEs in the same group occupy the same time-frequency resources, and the time-frequency resources occupied by different groups are orthogonal.

6. The method of claim 4, wherein the method further comprises:

A globally unique group ID is assigned to each group and the UE is notified.

7. An uplink non-orthogonal multiple access transmission feedback device, applied to a base station, characterized in that the device comprises: a detection unit and a feedback unit;

The detection unit is used to detect the data transmitted by the UE in each group;

The feedback unit is configured to feed back group-based common control signaling to the UE according to the detection result of the detection unit, and feed back the dedicated control signaling of the UE to the UEs with the same detection result and a small number of UEs respectively, so that the UE detects When the dedicated control signaling for the UE exists and there is a feedback result, a new transmission or retransmission is performed according to the feedback result indicated by the dedicated control signaling; New transmission or retransmission of the feedback results; wherein, the detection result for a group in the common control signaling is the detection result corresponding to the UE with the same detection result and many UEs in the group; The detection result is the detection result of the corresponding UE.

8. The device of claim 7, wherein

9. The device of claim 7, wherein

The detection unit is specifically configured to feed back the group-based common control signaling to the UE according to the detection result, and respectively feed back the dedicated control signaling of the UE to the UEs with the same detection result and a small number of UEs in the group, including: counting the number of UEs in the group. The number M of UEs whose detection result is ACK, and the number N of UEs whose detection result is NACK; when it is determined that M is greater than N, the detection result based on the group in the common control signaling fed back to the UE is ACK, and the detection result is NACK to the UE. The detection result in the dedicated control signaling corresponding to the UE fed back by the UE is NACK; when it is determined that M is less than N, the detection result based on this group in the common control signaling fed back to the UE is NACK, and the detection result is ACK to the public control signaling fed back to the UE. The detection result in the dedicated control signaling corresponding to the UE fed back by the UE is ACK.

10. The device according to any one of claims 7-9, characterized in that,

The common control signaling is group common control signaling, or group dedicated control signaling;

11. An uplink non-orthogonal multiple access transmission feedback system, characterized in that the system comprises:

The base station is used to detect the data transmitted by the UEs in each group; feed back group-based public control signaling to the UEs according to the detection results, and feed back the dedicated control signaling of the UEs to the UEs with the same detection results and a small number of UEs respectively; wherein , the detection result for a group in the common control signaling is the detection result corresponding to the UE with the same detection result and many UEs in the group; the detection result in the dedicated control signaling is the detection result of the corresponding UE;

UE is used to detect feedback signaling; when a dedicated control signaling for the UE is detected and there is a feedback result, new transmission or retransmission is performed according to the feedback result indicated by the dedicated control signaling; otherwise, according to the detected New transmission or retransmission is performed based on the feedback result indicated by the common control signaling of the group to which the UE belongs.

12. The system of claim 11, wherein

13. The system of claim 11, wherein

The base station is specifically configured to feed back the group-based common control signaling to the UE according to the detection result, and respectively feed back the dedicated control signaling of the UE to the UE with the same detection result and a small number of UEs in the group, including: counting the detection results in the group. The number M of UEs whose detection result is ACK, and the number N of UEs whose detection result is NACK; when it is determined that M is greater than N, the detection result based on the group in the common control signaling fed back to the UE is ACK, and the detection result is NACK to the UE. The detection result in the dedicated control signaling of the UE corresponding to the feedback is NACK; when it is determined that M is less than N, the detection result based on this group in the common control signaling fed back to the UE is NACK, and the detection result is ACK to the UE with an ACK result. The feedback detection result in the dedicated control signaling corresponding to the UE is ACK.

14. The system according to any one of claims 11-13, characterized in that,