Timing advance validation enhancements for pre-configured uplink resources
Technologies and techniques are disclosed for managing timing advance (TA) validation of configured grant small data transmission (CG-SDT). A scheduling entity may receive downlink signal quality measurements for downlink beams from a scheduled entity, as well as a CG-SDT configuration request. The scheduling entity may transmit a CG-SDT configuration to the UE in response to receiving the CG-SDT configuration request, where the CG-SDT configuration includes a timing advance (TA) validation criteria based on downlink signal quality measurements meeting configured thresholds.
1 . A scheduling entity within a wireless communication network, comprising:
a one or more memories; and
a one or more processors coupled to the one or more memories, wherein the one or more processors are configured to:
transmit a configured grant small data transmission (CG-SDT) configuration to a user equipment (UE), the CG-SDT configuration comprising timing advance (TA) validation criteria indicating that TA validation prior to a CG-SDT transmission be based on at least one downlink signal quality measurement meeting at least one threshold;
transmit, on a periodic schedule together with one of a wake-up signal (WUS) or a paging signal within a discontinuous reception (DRX) time period, one or more downlink reference signals for TA validation; and
receive a communication from the UE based on the CG-SDT configuration.
2 . The scheduling entity of claim 1 , wherein the downlink signal quality measurements comprise reference signal received power (RSRP) measurements or a variation in RSRP measurements.
3 . The scheduling entity of claim 1 , wherein the TA validation criteria also indicates one or more of:
at least one downlink signal quality measurement configuration, at least one downlink reference signal, a respective beam index of each of the at least one downlink reference signal, positioning information obtained from at least one of a serving cell or one or more neighbor cells, a respective transmit power offset to be applied to the downlink signal quality measurements for each of the at least one downlink reference signal, a UE capability, a UE radio resource control (RRC) state, a UE uplink coverage enhancement for a CG-SDT transmission, a detected change of a serving cell or transmission and reception point (TRP), or a TA timer configuration.
4 . The scheduling entity of claim 3 , wherein the UE RRC state comprises one of an inactive state, an idle state and a connected state.
5 . The scheduling entity of claim 4 , wherein, for one of the inactive state or idle state, the one or more processors are configured to transmit the CG-SDT configuration via one of Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) Control Element (MAC CE).
6 . The scheduling entity of claim 1 , wherein the one or more processors are configured to transmit the one or more downlink reference signals within a measurement gap that at least partially overlaps with a WUS occasion, a paging occasion, or a DRX-ON time period of the UE configured with CG-SDT resources.
7 . The scheduling entity of claim 1 , wherein the periodic schedule for a CG-SDT transmission is jointly configured with a DRX cycle, and the periodicity of the CG-SDT transmission is configured to be proportional to a periodicity of the DRX cycle.
8 . The scheduling entity of claim 1 , wherein the one or more processors are configured to transmit the CG-SDT configuration by transmitting a search space configuration and PDCCH configuration that at least partially overlap with a WUS occasion, a paging occasion, or a DRX-ON time period of the UE configured with CG-SDT resources.
9 . The scheduling entity of claim 3 , wherein the UE uplink coverage enhancement comprises a number of PUSCH repetition levels, a number of aggregated PUSCH slots, or a PUSCH repetition pattern comprising at least frequency hopping, redundancy version cycling and DMRS configuration.
10 . The scheduling entity of claim 1 , wherein the one or more processors are configured to transmit the CG-SDT configuration to the UE by transmitting CG-SDT configuration parameters for the UE, downlink reference signals or channels used by the UE for TA validation and the TA validation criteria for the UE, and wherein a time gap between the downlink reference signals or channels used by the UE for TA validation and the CG-SDT transmission from the UE is no less than a configured time threshold.
11 . The scheduling entity of claim 1 , wherein the one or more processors are configured to transmit the CG-SDT configuration by transmitting a common or separate CG-SDT configuration to a plurality of user equipment (UEs), and wherein the processor and the memory are configured to transmit the CG-SDT configuration by transmitting the common or a separate CG-SDT configuration on a shared or partially overlapped radio resource in a time or frequency domain, using one or multiple beams which have quasi-colocation (QCL) relationship with other DL broadcast beams.
12 . A method of wireless communication of a scheduling entity in a wireless communication network, the method comprising:
transmitting a configured grant small data transmission (CG-SDT) configuration to a user equipment (UE), the CG-SDT configuration comprising timing advance (TA) validation criteria based on at least one downlink signal quality measurement meeting at least one threshold;
transmit, on a periodic schedule together with one of a wake-up signal (WUS) or a paging signal within a discontinuous reception (DRX) time period, one or more downlink reference signals for TA validation of a CG-SDT transmission
receiving a communication from the UE based on the CG-SDT configuration.
13 . The method of claim 12 , wherein the downlink signal quality measurements comprise reference signal received power (RSRP) measurements or a variation in RSRP measurements.
14 . The scheduling entity of claim 12 , wherein the TA validation criteria also indicates one or more of:
at least one downlink signal quality measurement configuration, at least one downlink reference signal, a respective beam index of each of the at least one downlink reference signal, positioning information obtained from at least one of a serving cell or one or more neighbor cells, a respective transmit power offset to be applied to the downlink signal quality measurements for each of the at least one downlink reference signal, a UE capability, a UE radio resource control (RRC) state, a UE uplink coverage enhancement for a CG-SDT transmission, a detected change of a serving cell or transmission and reception point (TRP), or a TA timer configuration.
15 . The method of claim 14 , wherein the UE RRC state comprises one of an inactive state, an idle state and a connected state.
16 . The method of claim 15 , wherein, for one of the inactive state or idle state, the transmitting of the CG-SDT configuration comprises transmitting the CG-SDT configuration via one of Radio Resource Control (RRC) signaling or MAC Control Element (MAC CE).
17 . The method of claim 12 , wherein transmitting the CG-SDT configuration further comprises transmitting the downlink reference signals within a measurement gap configuration that at least partially overlaps with a WUS occasion, a paging occasion, or a DRX-ON time period of the UE configured with CG-SDT resources.
18 . The method of claim 12 , wherein the periodic schedule is jointly configured with a DRX cycle, and a periodicity of CG-SDT configuration transmission is configured to be proportional to a periodicity of the DRX cycle.
19 . The method of claim 12 , wherein transmitting the CG-SDT configuration further comprises transmitting a search space configuration and PDCCH configuration that at least partially overlaps with a WUS occasion, paging occasion, or a DRX-ON time period of the UE configured with CG-SDT resources.
20 . The method of claim 14 , wherein a range for the UE uplink coverage enhancement comprises a number of PUSCH repetition levels, or a number of aggregated PUSCH slots, or a PUSCH repetition pattern including at least frequency hopping, redundancy version cycling and DMRS configuration.
21 . The method of claim 12 , wherein transmitting the CG-SDT configuration to the UE comprises transmitting CG-SDT configuration parameters for the UE, downlink reference signals or channels used by the UE for TA validation and the TA validation criteria for the UE, and wherein a time gap between the downlink reference signals or channels used by the UE for TA validation and a CG-SDT transmission from the UE is no less than a configured time threshold.
22 . The method of claim 12 , wherein transmitting the CG-SDT configuration comprises transmitting a common or separate CG-SDT configuration to a plurality of user equipment (UEs), and wherein transmitting the CG-SDT configuration comprises transmitting the common or separate CG-SDT configuration on a shared or partially overlapped radio resource in a time or frequency domain, using one or multiple beams which have quasi-colocation (QCL) relationship with other DL broadcast beams.