METHOD AND APPARATUS FOR DETERMINING TIMING ADVANCE VALUE

1 . A method, comprising:

receiving, from a second node at a third node, information related to a timing advance (TA) value for uplink transmissions, wherein the second node is a parent node of the third node; and

determining a first TA value for uplink transmissions based on the information.

2 - 6 . (canceled)

7 . The method according to claim 1 , wherein the first TA value is one of a plurality of TA values, and the method further comprises:

receiving configuration information for selecting a TA value from a plurality of TA values; and

selecting the TA value to be applied to uplink transmissions from the plurality of TA values based on the configuration information.

8 . The method according to claim 7 , wherein the configuration information indicates at least one of a periodicity, offset, and duration for each TA value of the plurality of TA values.

9 . The method according to claim 8 , wherein the configuration information is received via a radio resource control (RRC) signaling.

10 - 46 . (canceled)

47 . An apparatus, comprising:

at least one non-transitory computer-readable medium having stored thereon computer-executable instructions;

at least one receiving circuitry;

at least one transmitting circuitry; and

at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the computer-executable instructions cause the at least one processor to:

receive, from a second node at a third node, information related to a timing advance (TA) value for uplink transmissions, wherein the second node is a parent node of the third node; and

determine a first TA value for uplink transmissions based on the information.

48 . (canceled)

49 . The apparatus according to claim 47 , wherein the information indicates a propagation delay associated with a link between a first node and the second node, and wherein the first node is a parent node of the second node

50 . The apparatus according to claim 47 , wherein the information is received via a medium access control (MAC) control element (CE) signaling.

51 . The apparatus according to claim 49 , wherein the computer-executable instructions cause the at least one processor to:

receive an indication of a sub-carrier space (SCS) associated with the link between the first node and the second node;

wherein the indication of the SCS is received via a radio resource control (RRC) signaling or a medium access control (MAC) control element (CE) signaling;

wherein the first TA value for uplink transmissions is determined further based on the indication of the SCS.

52 . The apparatus according to claim 47 , wherein the first TA value is one of a plurality of TA values, and the computer-executable instructions further cause the at least one processor to:

receive configuration information for selecting a TA value from a plurality of TA values, wherein the configuration information indicates at least one of a periodicity, offset, and duration for each TA value of the plurality of TA values; and

select the TA value to be applied to uplink transmissions from the plurality of TA values based on the configuration information.

53 . The apparatus of claim 52 , wherein the configuration information indicates at least one of a periodicity, offset, and duration for each TA value of the plurality of TA values.

54 . The apparatus of claim 53 , wherein the configuration information is received via a radio resource control (RRC) signaling.

55 . The apparatus of claim 52 , wherein the configuration information is configured per cell or per TA group (TAG) and is received via a radio resource control (RRC) signaling or a medium access control (MAC) control element (CE) signaling.

56 . The apparatus of claim 52 , wherein:

the configuration information is received via group-common downlink control information (DCI);

the configuration information is indicated by a reserved slot format index in the group-common DCI; and

the computer-executable instructions further cause the at least one processor to:

receive a radio resource control (RRC) signaling or a medium access control (MAC) control element (CE) signaling, wherein the position is a starting position of bits for the configuration information in the group-common DCI.

57 . The apparatus according to claim 47 , wherein the first TA value is one of a plurality of TA values, and the computer-executable instructions further cause the at least one processor to:

receive a user equipment (UE)-specific downlink control information (DCI) scrambled by a radio network temporary identity (RNTI); and

select a TA value to be applied to uplink transmissions from the plurality of TA values based on the RNTI.

58 . The apparatus according to claim 52 , wherein: the configuration information is received via user equipment (UE)-specific downlink control information (DCI); and the configuration information is included in a dedicated field in the UE-specific DCI.

59 . The apparatus according to claim 56 , and the computer-executable instructions further cause the at least one processor to:

receive a radio resource control (RRC) signaling or a medium access control (MAC) control element (CE) signaling;

apply the TA value after an application delay indicated by one of the RRC signaling or MAC CE signaling; and

apply the TA value at the same slot as the group common DCI.

60 . The apparatus according to claim 56 , and the computer-executable instructions further cause the at least one processor to:

apply the TA value at a time domain resource when no periodic TA value is indicated for the time domain resource.

61 . The apparatus according to claim 47 , and the computer-executable instructions further cause the at least one processor to:

when no periodic TA value is indicated for a time domain resource for uplink transmission, apply a latest TA value at the time domain resource for the uplink transmission.

62 . An apparatus, comprising:

at least one non-transitory computer-readable medium having stored thereon computer-executable instructions;

at least one receiving circuitry;

at least one transmitting circuitry; and

at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the computer-executable instructions cause the at least one processor to:

transmit, from a second node to a third node, information related to a timing advance (TA) value for uplink transmissions at the third node, wherein the second node is a parent node of the third node.

63 . The apparatus according to claim 57 , wherein the computer-executable instructions cause the at least one processor to:

transmit, via one of a radio resource control (RRC) signaling or a medium access control (MAC) control element (CE) signaling to the third node, configuration information for selecting a TA value to be applied to uplink transmissions at the third node from a plurality of TA values, wherein the configuration information indicates at least one of a periodicity, offset, and duration for each TA value of the plurality of TA values.