US-12621086-B2 - Configuration and interpretation of control information for retransmission

Abstract

Example embodiments of the present disclosure relate to configuration and interpretation of control information for a retransmission. A first device receives control information from a second device. In accordance with a determination that the control information indicates a retransmission to be scheduled from the second device. the first device determines an information combination of at least one of the following: at least one field of the control information, a search space in which the control information is received. and a format of the control information. The first device further determines a source traffic type of the retransmission based on the information combination, the source traffic type of the retransmission indicating whether the retransmission is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission.

Inventors

• Athul Prasad
• David BHATOOLAUL
• Naizheng ZHENG
• David NAVRÁTIL
• Volker PAULI
• Ugur Baran ELMALI

Assignees

• NOKIA TECHNOLOGIES OY

Dates

Publication Date

20260505

Application Date

20210806

Claims (18)

1. 1 . A first device comprising: at least one processor; and at least one memory including computer program code; wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to: receive control information from a second device; in accordance with a determination that the control information indicates a retransmission to be scheduled from the second device, determine an information combination of the following: at least one field of the control information, a search space in which the control information is received, and a format of the control information; and determine a source traffic type of the retransmission based on the information combination, the source traffic type of the retransmission indicating whether the retransmission is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission.
2. 2 . The first device of claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine, based on at least one field of the control information, that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission.
3. 3 . The first device of claim 2 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine, based on the at least one field of the control information, that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission, in accordance with a determination that the format of the control information is a format configured for the search space.
4. 4 . The first device of claim 2 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission in accordance with of the following: a determination that a first field for an identifier for the format of the control information is set to a first predefined value, a determination that a second field for a transmit power control command is set to a second predefined value, a determination that a size of information contained in a third field for frequency domain resource allocation is dimensioned based on a size of a common frequency resource, a determination that a fourth field for a carrier indicator is set to a third predefined value, and a determination that a fifth field for a bandwidth part indicator is set to a fourth predefined value.
5. 5 . The first device of claim 4 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission in accordance with: a determination that the search space is a user equipment-specific search space or a common search space, and the format of the control information is downlink control information format 1_0, a determination that the first field is set to the first predefined value, and a determination that the second field is set to the second predefined value.
6. 6 . The first device of claim 4 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission in accordance with: a determination that the search space is a common search space and the format of the control information is downlink control information format 1_1 or downlink control information format 1_2, and a determination that the size of information contained in the third field is dimensioned based on the size of the common frequency resource.
7. 7 . The first device of claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine the source traffic type of the retransmission based on the information combination in accordance with at least one of the following: a determination that a point-to-point retransmission is allowed for the point-to-multi- point initial transmission, and a determination that a predefined type of codebook is used for decoding traffic received from the second device.
8. 8 . A second device comprising: at least one processor; and at least one memory including computer program code; wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to: determine whether a retransmission to be scheduled is for traffic in a point-to- multipoint initial transmission or in a point-to-point initial transmission; determine, based on a determination of whether the retransmission is for the traffic in the point-to-multipoint initial transmission or in the point-to-point initial transmission, an information combination of the following: at least one field of control information for the retransmission, a search space for the control information, and a format of the control information; and transmit the control information to a first device based on the determined information combination, the control information indicating that the retransmission is scheduled.
9. 9 . The second device of claim 8 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the information combination by: in accordance with a determination that the retransmission is for the traffic in the point- to-multipoint initial transmission, determining the format of the control information and the search space such that the format of the control information is a format not configured for the search space.
10. 10 . The second device of claim 9 , wherein the search space is a common search space, and wherein the format of the control information is downlink control information format 1_1 or downlink control information format 1_2.
11. 11 . The second device of claim 8 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the information combination by: in accordance with a determination that the retransmission is for the traffic in the point-to- multipoint initial transmission, determining the format of the control information, and determining the at least one field of the control information to indicate that the retransmission is for the traffic in the point-to-multipoint initial transmission.
12. 12 . The second device of claim 11 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the at least one field of the control information by: determining the format of the control information and the search space such that the determined format is a format configured for the determined search space.
13. 13 . The second device of claim 11 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the at least one field of the control information by: setting a first field for an identifier for the format of the control information to a first predefined value, setting a second field for a transmit power control command to a second predefined value, setting a size of information contained in a third field for frequency domain resource allocation based on a size of a common frequency resource, setting a fourth field for a carrier indicator to a third predefined value, and setting that a fifth field for a bandwidth part indicator to a fourth predefined value.
14. 14 . The second device of claim 13 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the at least one field of the control information by: in accordance with a determination that the search space is a user equipment-specific search space or a common search space, and the format of the control information is downlink control information format 1_0, setting the first field to the first predefined value, and setting the second field to the second predefined value.
15. 15 . The second device of claim 13 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to determine the at least one field of the control information by: in accordance with a determination that the search space is a common search space and the format of the control information is downlink control information format 1_1 or downlink control information format 1_2, setting the size of information contained in the third field based on the size of the common frequency resource.
16. 16 . A method comprising: receiving, at a first device, control information from a second device; in accordance with a determination that the control information indicates a retransmission to be scheduled from the second device, determining an information combination of at least one the following: at least one field of the control information, a search space in which the control information is received, and a format of the control information; and determining a source traffic type of the retransmission based on the information combination, the source traffic type of the retransmission indicating whether the retransmission is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission.
17. 17 . The method of claim 16 , wherein determining the source traffic type of the retransmission comprises: in accordance with a determination that the format of the control information is a format not configured for the search space, determining that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission.
18. 18 . The method of claim 17 , wherein determining that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission comprises: in accordance with a determination that the search space is a common search space, and a determination that the format of the control information is downlink control information format 1_1 or downlink control information format 1_2, determining that the source traffic type of the retransmission indicates that the retransmission is for the traffic in the point-to-multipoint initial transmission.

Description

RELATED APPLICATION This application is a 371 of PCT Application No. PCT/CN2021/111362, filed on Aug. 6, 2021, of which is incorporated herein by reference in its entirety. FIELD Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to devices, methods, apparatuses and computer readable storage medium for configuration and interpretation of control information for a retransmission. BACKGROUND With the rapid development of the communication technology, communication systems can support various types of service applications for devices. For example, as part of the work on the fifth-generation (5G) (also called new radio (NR)) multicast, the Third Generation Partnership Project (3GPP) is currently defining mechanisms for enabling delivery of multicast or broadcast traffic to a multitude of terminal devices. One of the aims of the work is to define group scheduling mechanisms that enable the multicast or broadcast traffic to be scheduled using the common data channel resources, while maintaining maximum commonalities with the currently defined unicast scheduling and operation mechanisms. As a result, the communication systems can support both the unicast scheduling and multicast/broadcast scheduling. SUMMARY In general, example embodiments of the present disclosure provide a solution for configuration and interpretation of control information for a retransmission of a PTM transmission. Embodiments that do not fall under the scope of the claims, if any, are to be interpreted as examples useful for understanding various embodiments of the disclosure. In a first aspect, there is provided a first device. The first device comprises at least one processor; and at least one memory including computer program code; where the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to: receive control information from a second device; in accordance with a determination that the control information indicates a retransmission to be scheduled from the second device, determine an information combination of at least one of the following: at least one field of the control information, a search space in which the control information is received, and a format of the control information; and determine a source traffic type of the retransmission based on the information combination, the source traffic type of the retransmission indicating whether the retransmission is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission. In a second aspect, there is provided a second device. The second device comprises at least one processor; and at least one memory including computer program code; where the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to: determine whether a retransmission to be scheduled is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission; determine, based on a determination of whether the retransmission is for the traffic in the point-to-multipoint initial transmission or in the point-to-point initial transmission, an information combination of at least one of the following: at least one field of control information for the retransmission, a search space for the control information, and a format of the control information; and transmit the control information to the first device based on the determined information combination, the control information indicating that the retransmission is scheduled. In a third aspect, there is provided a method. The method comprises receiving, at a first device, control information from a second device; in accordance with a determination that the control information indicates a retransmission to be scheduled from the second device, determining an information combination of at least one of the following: at least one field of the control information, a search space in which the control information is received, and a format of the control information; and determining a source traffic type of the retransmission based on the information combination, the source traffic type of the retransmission indicating whether the retransmission is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission. In a fourth aspect, there is provided a method. The method comprises determining, at a second device, whether a retransmission to be scheduled is for traffic in a point-to-multipoint initial transmission or in a point-to-point initial transmission; determining, based on a determination of whether the retransmission is for the traffic in the point-to-multipoint initial transmission or in the point-to-point initial transmission, an information combination of at least one of the following: at least one field of control information for the retransmission, a search space fo