Control information transmission and sensing in wireless systems
A 5G UE achieves flexible SL time resource granularity by determining which UL/Flexible symbols/slots belong to a symbol-based SL resource pool and a slot-based SL resource pool based on SFI in RRC/GC-PDCCH. The UE then determines which resources are available in each pool based on sensing and selects a resource pool to use so that QoS/latency requirements are met.
1. A first vehicle to everything (V2X) wireless transmit/receive unit (WTRU), the WTRU comprising:
a transceiver; and
a processor, coupled to the transceiver, configured to determine a type of sidelink (SL) time resource block (STRB) of an available resource pool including at least one of undesignated flexible symbols or assigned uplink (UL) symbols;
the processor configured to select a first bandwidth part (BWP) for use in SL communication with a second WTRU when the STRB type is a flexible symbol based STRB;
the processor configured to select a second BWP for use in SL communication with the second WTRU when the STRB type is an uplink (UL) symbol based STRB, wherein the first BWP is larger than the second BWP; and
the processor configured to use at least one of the first BWP or the second BWP to perform a SL transmission to the second WTRU, wherein the first BWP and second BWP are part of a set of BWPs associated with at least one STRB pool based on at least one STRB property.
2. The first V2X WTRU of claim 1 , wherein the first WTRU has a PSCCH frequency resource allocation associated with each of the first BWP and second BWP.
3. The first V2X WTRU of claim 1 , wherein each BWP includes an identical PSCCH frequency resource allocation.
4. The first V2X WTRU of claim 1 , wherein the processor is further configured to use a third BWP for SL communication with the second WTRU based on sensing results from a wide-band energy measurement of SL BWPs.
5. The first V2X WTRU of claim 4 , wherein on a condition that a received signal strength indicator (RSSI) of the wide-band measurement of SL BWPs exceeds a pre-configured threshold, the processor further configured to use the third BWP for SL communication with the second WTRU.
6. The first V2X WTRU of claim 1 , wherein the set of BWPs is a set of SL STRBs that are non-overlapping with any UL BWPs for UL-slot-based STRBs.
7. The first V2X WTRU of claim 1 , wherein the set of BWPs is a set of SL STRBs that are non-overlapping with any UL BWPs for UL-symbol-based STRBs.
8. The first V2X WTRU of claim 1 , wherein the set of BWPs is a set of SL STRBs that are partially or completely overlapping with an UL BWP for flexible-slot-based STRBs.
9. The first V2X WTRU of claim 1 , wherein the set of BWPs is a set of SL STRBs that are partially or completely overlapping with an UL BWP for flexible-symbol-based STRBs.
10. A method for use in a first vehicle to everything (V2X) wireless transmit/receive unit (WTRU), the method comprising:
determining a type of sidelink (SL) time resource block (STRB) of an available resource pool comprising at least one of undesignated flexible symbols and assigned uplink (UL) symbols;
on a condition that the STRB type is a flexible symbol based STRB, selecting a first bandwidth part (BWP) for use in SL communication with a second WTRU;
on a condition that the STRB type is an uplink (UL) symbol based STRB, selecting a second BWP for use in SL communication with the second WTRU, wherein the first BWP is larger than the second BWP; and
using at least one of the first BWP and the second BWP to perform a SL transmission to the second WTRU, wherein the first BWP and second BWP are part of a set of BWPs associated with at least one STRB pool based on at least one STRB property.
11. The method of claim 10 , wherein each of the first BWP and second BWP is associated with a PSCCH frequency resource allocation.
12. The method of claim 10 , wherein each BWP includes an identical PSCCH frequency resource allocation.
13. The method of claim 10 , further comprising using a third BWP for SL communication with the second WTRU based on sensing results from a wide-band energy measurement of SL BWPs.
14. The method of claim 13 , further comprising on a condition that a received signal strength indicator (RSSI) of the wide-band energy measurement of SL BWPs exceeds a pre-configured threshold, using the third BWP for SL communication with the second WTRU.
15. The method of claim 10 , wherein the set of BWPs is a set of SL STRBs that are non-overlapping with any UL BWPs for UL-slot-based STRBs.
16. The method of claim 10 , wherein the set of BWPs is a set of SL STRBs that are non-overlapping with any UL BWPs for UL-symbol-based STRBs.
17. The method of claim 10 , wherein the set of BWPs is a set of SL STRBs that are partially or completely overlapping with an UL BWP for flexible-slot-based STRBs.
18. The method of claim 10 , wherein the set of BWPs is a set of SL STRBs that are partially or completely overlapping with an UL BWP for flexible-symbol-based STRBs.