Configuration and application of sidelink identification in wireless communication system
According to an aspect of the present disclosure, there is provided a method of transmitting feedback information from a user equipment (UE) in a new radio (NR) vehicle-to-everything (V2X) system. Here, the method of transmitting feedback information may include performing, by a first UE and a second UE, a session establishment process based on at least one of unicast and groupcast; exchanging, by the first UE and the second UE, ID information in the session establishment process; and completing, by the first UE and the second UE, the session establishment. Here, when the first UE and the second UE complete the session establishment, a physical layer ID representing a session may be determined.
1. A method comprising:
receiving, by a first wireless user device, a radio resource control (RRC) signaling configuration indicating a sidelink (SL) identifier (ID) value;
determining, based on a least significant bit (LSB) part of a layer-2 ID, a layer-1 ID for SL communication, wherein layer-1 is a physical layer of a wireless communication system, wherein layer-2 is an upper layer of the physical layer, and wherein the upper layer comprises a medium access control (MAC) laver;
receiving, from a second wireless user device and based on the layer-1 ID, at least one data packet via a physical sidelink shared channel (PSSCH);
generating an orthogonal sequence for a physical sidelink feedback channel (PSFCH) format, based on:
the SL ID value; and
a cyclic hopping parameter; and
transmitting, to the second wireless user device and based on the orthogonal sequence, SL feedback control information (SFCI) via a PSFCH.
2. The method of claim 1 , wherein the layer-2 ID is used to identify at least one of: a unicast layer-2 link; or a groupcast layer-2 link.
3. The method of claim 1 , wherein the layer-2 ID comprises at least one of: a layer-2 source ID; or a layer-2 destination ID, and
wherein the layer-1 ID comprises at least one off a layer-1 source ID; or a layer-1 destination ID.
4. The method of claim 3 , further comprising:
receiving, from the second wireless user device, a physical sidelink control channel (PSCCH) transmission indicating control information associated with a scheduling of the PSSCH;
receiving, from the second wireless user device, sidelink control information (SCI), wherein an SCI format of the SCI indicates the layer-1 source ID and the layer-1 destination ID; and
determining, based on the receiving the at least one data packet via the PSSCH, at least one sidelink hybrid automatic repeat request (HARQ) feedback bit for PFSCH transmission.
5. The method of claim 1 , wherein an initialization value Cinit for generating the orthogonal sequence is determined based on the SL ID value.
6. The method of claim 1 , wherein the SL-layer-1 ID is used for filtering of packets at a physical layer of the first wireless user device, and
wherein the layer-1 ID consists of T bits, and the layer-2 ID consists of X bits, where X is greater than T.
7. The method of claim 1 , wherein the SFCI comprises a SL hybrid automatic repeat request (HARQ) feedback information associated with the PSSCH.
8. The method of claim 1 , wherein the orthogonal sequence is generated further based on the cyclic hopping parameter, a group number of a sequence group of the orthogonal sequence, and a sequence number of the sequence group of the orthogonal sequence.
9. The method of claim 8 , wherein the group number of the sequence group of the orthogonal sequence is determined based on the SL ID value.
10. The method of claim 9 , wherein the group number of the sequence group is determined based on n ID SL mod 30, where the SL ID value is n ID SL , and
wherein the sequence number within the sequence group is set to zero.
11. The method of claim 1 , wherein the cyclic hopping parameter is determined based on a value that is determined based on a groupcast link ID.
12. The method of claim 11 , wherein the SL-layer-1 ID comprises at least one of: a layer-1 source ID; or a layer-1 destination ID, and
wherein the groupcast link ID is based on at least one of:
the layer-1 source ID; or
a group member ID within a group.
13. A method comprising:
receiving, by a first wireless user device, a radio resource control (RRC) message indicating a sidelink (SL) identifier (ID) value;
determining, based on a least significant bit (LSB) part of a layer-2 source ID, a layer-1 source ID, wherein layer-1 is a physical layer of a wireless communication system, wherein layer-2 is an upper layer of the physical layer, and wherein the upper layer comprises a medium access control (MAC) laver;
determining, based on a least significant bit (LSB) part of a layer-2 destination ID, a layer-1 destination ID;
receiving, from a second wireless user device and based on the layer-1 destination ID, at least one data packet via a physical sidelink shared channel (PSSCH);
generating an orthogonal sequence for a physical sidelink feedback channel (PSFCH) format, based on:
the SL ID value; and
the layer-1 source ID; and
transmitting, to the second wireless user device and based on the orthogonal sequence, SL feedback control information (SFCI) via a PSFCH.
14. The method of claim 13 , wherein the orthogonal sequence is generated further based on a cyclic hopping parameter, a group number of a sequence group of the orthogonal sequence, and a sequence number of the sequence group of the orthogonal sequence.
15. The method of claim 14 , wherein the group number of the sequence group is determined based on n ID SL mod 30, where the SL ID value is n ID SL , and
wherein the sequence number within the sequence group is set to zero.
16. The method of claim 14 , wherein the cyclic hopping parameter is determined based on a value that is determined based on the layer-1 source ID.
17. The method of claim 13 , further comprising:
receiving, from the second wireless user device, a physical sidelink control channel (PSCCH) transmission indicating control information associated with a scheduling of the PSSCH;
receiving, from the second wireless user device, sidelink control information (SCI), wherein an SCI format of the SCI indicates the layer-1 source ID and the layer-1 destination ID; and
determining, based on the receiving the at least one data packet via the PSSCH, at least one sidelink hybrid automatic repeat request (HARQ) feedback bit for PFSCH transmission.
18. The method of claim 13 , wherein an initialization value Cinit of the orthogonal sequence is determined based on the SL ID value.
19. The method of claim 13 , wherein the SFCI comprises a SL hybrid automatic repeat request (HARQ) feedback information associated with the at least one data packet transmitted via the PSSCH.
20. The method of claim 13 , wherein a sequence group number of the orthogonal sequence is determined based on the SL ID value.