Method and apparatus for inter-user equipment coordination signaling
Methods and apparatuses for inter user equipment (UE) coordination signaling. A method of operating a UE includes determining a first set of first sidelink (SL) resources based on SL sensing and resource exclusion; selecting a first one or more SL resources within the first determined set for reservation, transmitting information about the first one or more SL resources, and receiving inter UE co-ordination information indicating whether a SL resource in the first one or more SL resources has a conflict. The method further includes transmitting on one of the first one or more SL resources, when the one SL resource does not have a conflict; and determining a second set of SL resources based on SL sensing and resource exclusion, and selecting a second one or more SL resources within the second set for transmission and reservation, when all of the first one or more SL resources have a conflict.
1. A user equipment (UE) in a communication system, the UE comprising:
a processor configured to determine a logical slot for a S th sidelink grant for a sidelink configured grant type 1 based on:
(sl-ReferenceSlotCG-Type1+sl-TimeOffsetCGType1+S×PeriodicitySL) modulo (T′ max ),
wherein:
sl-ReferenceSlotCG-Type1 is a reference logical slot defined based on sl-TimeReferenceSFN_Type1,
sl_TimeReferenceSFN_Type1 is a system frame number determined as 0 or 512,
sl-TimeOffsetCGType1 is an offset of a resource with respect to the reference logical slot defined based on sl-TimeReferenceSFN_Type1 in time domain,
PeriodicitySL
is
defined
as
⌈
T
max
′
10240
ms
×
sl_periodCG
⌉
,
sl_periodCG is a periodicity of the sidelink configured grant type 1, and
T′ max is a number of slots that belongs to a resource pool and defined based on a number of slots corresponding to bits having value 1 within a bitmap, among a set of slots excluding at least one non-SL slot, at least one non S-SSB slot, and at least one reserved slot.
2. The UE of claim 1 , wherein the processor is further configured to determine a logical slot for a S th sidelink grant for a sidelink configured grant type 2 based on:
[sl-StartSlotCG-Type2+S×PeriodicitySL] modulo (T′ max ),
wherein sl-StartSlotCG-Type2 is a logical slot of a first transmission opportunity of a physical sidelink shared channel (PSSCH) where a configured sidelink grant was (re-)initialized.
3. The UE of claim 1 , wherein:
T
max
′
=
(
2
μ
×
10240
-
N
nonSL
-
N
S
-
SSB
-
N
reserved
)
×
L
bitmap
,
one
L
bitmap
,
μ: is a sub-carrier spacing configuration,
N nonSL : is a number of non-SL slots,
N S-SSB : is a number of S-SSB slots,
N reserved : is a number of reserved slots,
L bitmap,one : is a number of bits having value 1 in the bitmap associated with the resource pool, and
L bitmap : is a total number of bits in the bitmap associated with the resource pool.
4. A method performed by a user equipment (UE) in a communication system, the method comprising:
determining a logical slot for a s th sidelink grant for a sidelink configured grant type 1 based on:
(sl-ReferenceSlotCG-Type1+sl-TimeOffsetCGType1+S×PeriodicitySL) modulo (T′ max ),
wherein:
sl-ReferenceSlotCG-Type1 is a reference logical slot defined based on sl-TimeReferenceSFN_Type1,
sl_TimeReferenceSFN_Type1 is a system frame number determined as 0 or 512,
sl-TimeOffsetCGType1 is an offset of a resource with respect to the reference logical slot defined based on sl-TimeReferenceSFN_Type1 in time domain,
PeriodicitySL
=
⌈
T
max
′
10240
ms
×
sl_periodCG
⌉
sl_periodCG is a periodicity of the sidelink configured grant type 1, and
T′ max is a number of slots that belongs to a resource pool and defined based on a number of slots corresponding to bits having value 1 within a bitmap, among a set of slots excluding at least one non-SL slot, at least one non S-SSB slot, and at least one reserved slot.
5. The method of claim 4 , further comprising:
determining a logical slot for a S th sidelink grant for a sidelink configured grant type 2 based on:
[sl-StartSlotCG-Type2+S×PeriodicitySL] modulo (T′ max ),
wherein sl-StartSlotCG-Type2 is a logical slot of a first transmission opportunity of a physical sidelink shared channel (PSSCH) where a configured sidelink grant was (re-)initialized.
6. The method of claim 4 , wherein:
T
max
′
=
(
2
μ
×
10240
-
N
nonSL
-
N
S
-
SSB
-
N
reserved
)
×
L
bitmap
,
one
L
bitmap
,
μ: is a sub-carrier spacing configuration,
N nonSL : is a number of non-SL slots,
N S-SSB : is a number of S-SSB slots,
N reserved : is a number of reserved slots,
L bitmap , one: is a number of bits having value 1 in the bitmap associated with the resource pool, and
L bitmap : is a total number of bits in the bitmap associated with the resource pool.