Time alignment management
The present disclosure is related to methods, user equipments (UEs), and network nodes for managing time alignment (TA). The method at a UE for managing TA related configuration comprises: receiving, from a network node, one or more TA related configurations; determining a TA related configuration from the received one or more TA related configurations at least partially based on at least one of a beam in which the UE is currently camped, a reference signal which is currently detected by the UE, and a configured grant (CG) configuration which is currently applied at the UE; and applying the determined TA related configuration.
1 . A method at a user equipment (UE) for managing time alignment (TA) related configuration, the method comprising:
receiving, from a network node, one or more TA related configurations, wherein the step of receiving comprises receiving a first TA related configuration used for a first configured grant (CG) configuration which is currently applied at the UE, wherein the first TA related configuration is used for all CG configurations configured at the UE comprising the first CG configuration;
determining a TA related configuration from the received one or more TA related configurations at least partially based on at least one of a beam in which the UE is currently camped, a reference signal which is currently detected by the UE, and a configured grant (CG) configuration which is currently applied at the UE; and
applying the determined TA related configuration.
2 . The method of claim 1 , wherein the one or more TA related configurations are related to small data transmission (SDT) at the UE in a non-connected state.
3 . The method of claim 1 , wherein each of the one or more TA related configurations comprises one or more criteria for checking validity of a TA at the UE.
4 . The method of claim 3 , wherein the one or more criteria comprises at least one of:
a TA timer;
a Reference Signal Received Power (RSRP) related configuration;
a Reference Signal Received Quality (RSRQ) related configuration;
a Signal to Interference plus Noise Ratio (SINR) related configuration;
a Synchronous Signal Block (SSB) or Channel State Information Reference Signal (CSI-RS) related configuration; and
a UE position related configuration.
5 . The method of claim 1 , wherein the one or more TA related configurations are received via one or more messages transmitted by the network node,
wherein the one or more messages comprise at least one of:
a broadcasted Radio Resource Control (RRC) message;
an RRC message dedicated for the UE only;
a Medium Access Control (MAC) Protocol Data Unit (PDU) message; and
a Downlink Control Information (DCI) message.
6 . The method of claim 5 , wherein the RRC message dedicated for the UE only is an RRC release message which triggers the UE to transition into an RRC INACTIVE state or an RRC IDLE state.
7 . The method of claim 1 , wherein the received one or more TA related configurations comprise multiple received TA related configurations, including the first TA related configuration, and wherein the step of determining a TA related configuration comprises: determining, from the multiple received TA related configurations, the first TA related configuration as the determined TA related configuration.
8 . A user equipment (UE), comprising:
a processor;
a memory storing instructions which, when executed by the processor, cause the processor to perform operations comprising:
receiving, from a network node, one or more time alignment (TA) related configurations, wherein receiving the one or more TA related configurations comprises receiving a first TA related configuration used for a first configured grant (CG) configuration which is currently applied at the UE, wherein the first TA related configuration is used for all CG configurations configured at the UE comprising the first CG configuration;
determining a TA related configuration from the received one or more TA related configurations at least partially based on at least one of a beam in which the UE is currently camped, a reference signal which is currently detected by the UE, and a configured grant (CG) configuration which is currently applied at the UE; and
applying the determined TA related configuration.
9 . The UE of claim 8 , wherein the received one or more TA related configurations comprise multiple received TA related configurations, including the first TA related configuration, and wherein the step of determining a TA related configuration comprises: determining, from the multiple received TA related configurations, the first TA related configuration as the determined TA related configuration.
10 . The UE of claim 8 , wherein the one or more TA related configurations are related to small data transmission (SDT) at the UE in a non-connected state.
11 . The UE of claim 8 , wherein each of the one or more TA related configurations comprises one or more criteria for checking validity of a TA at the UE.
12 . The UE of claim 11 , wherein the one or more criteria comprises at least one of:
a TA timer;
a Reference Signal Received Power (RSRP) related configuration;
a Reference Signal Received Quality (RSRQ) related configuration;
a Signal to Interference plus Noise Ratio (SINR) related configuration;
a Synchronous Signal Block (SSB) or Channel State Information Reference Signal (CSI-RS) related configuration; and
a UE position related configuration.
13 . The UE of claim 8 , the memory storing instructions which, when executed by the processor, cause the processor receive the one or more TA related configurations via one or more messages transmitted by the network node,
wherein the one or more messages comprise at least one of:
a broadcasted Radio Resource Control (RRC) message;
an RRC message dedicated for the UE only;
a Medium Access Control (MAC) Protocol Data Unit (PDU) message; and
a Downlink Control Information (DCI) message.
14 . The UE of claim 13 , wherein the RRC message dedicated for the UE only is an RRC release message which triggers the UE to transition into an RRC INACTIVE state or an RRC IDLE state.
15 . A method at a network node for managing time alignment (TA) related configuration for a user equipment (UE), the method comprising:
determining one or more TA related configurations for the UE at least partially based on at least one of one or more beams in which the UE is able to be camped, one or more reference signals which are able to be detected by the UE, and one or more configured grant (CG) configurations which are configured at the UE; and
transmitting, to the UE, the determined one or more TA related configurations, wherein the step of transmitting comprises transmitting, to the UE, a first TA related configuration used for a first configured grant (CG) configuration which is currently applied at the UE, wherein the first TA related configuration is used for all CG configurations configured at the UE comprising the first CG configuration.
16 . The method of claim 15 , wherein the one or more TA related configurations are related to small data transmission (SDT) at the UE in a non-connected state.
17 . The method of claim 15 , wherein each of the one or more TA related configurations comprises one or more criteria for checking validity of a TA at the UE.
18 . The method of claim 17 , wherein the one or more criteria comprises at least one of:
a TA timer;
a Reference Signal Received Power (RSRP) related configuration;
a Reference Signal Received Quality (RSRQ) related configuration;
a Signal to Interference plus Noise Ratio (SINR) related configuration;
a Synchronous Signal Block (SSB) or Channel State Information Reference Signal (CSI-RS) related configuration; and
a UE position related configuration.
19 . The method of claim 15 , wherein the one or more TA related configurations are received via one or more messages transmitted by the network node,
wherein the one or more messages comprise at least one of:
a broadcasted Radio Resource Control (RRC) message;
an RRC message dedicated for the UE only;
a Medium Access Control (MAC) Protocol Data Unit (PDU) message; and
a Downlink Control Information (DCI) message.
20 . The method of claim 19 , wherein the RRC message dedicated for the UE only is an RRC release message which triggers the UE to transition into an RRC INACTIVE state or an RRC IDLE state.