METHOD AND APPARATUS FOR DELAY STATUS REPORTING IN WIRELESS NETWORKS
A method performed by a UE for Delay Status Reporting (DSR) is provided. The method receives, from a BS, configuration information related to a Logical Channel Group (LCG). The method generates a DSR Medium Access Control (MAC) Control Element (CE) including a first field indicating a buffer size for the LCG and transmits the DSR MAC CE to the BS. The buffer size indicates a total amount of delay-critical data for the LCG. The delay-critical data for the LCG includes a first Packet Data Convergence Protocol (PDCP) Service Data Unit (SDU), for which a first discard timer has a remaining time value less than a time threshold associated with the LCG, and a second PDCP SDU belonging to a Protocol Data Unit (PDU) set that includes at least one PDCP SDU for which a second discard timer has a remaining time value less than the time threshold.
1 . A method performed by a User Equipment (UE) for Delay Status Reporting (DSR), the method comprising:
receiving, from a base station (BS), configuration information related to a Logical Channel Group (LCG) via Radio Resource Control (RRC) signaling;
triggering a DSR procedure;
generating a DSR Medium Access Control (MAC) Control Element (CE) comprising a first field indicating a buffer size for the LCG; and
transmitting the DSR MAC CE to the BS, wherein:
the buffer size indicates a total amount of delay-critical data for the LCG, and
the delay-critical data for the LCG comprises:
a first Packet Data Convergence Protocol (PDCP) Service Data Unit (SDU) for which a first discard timer has a remaining time value less than a time threshold associated with the LCG; and
a second PDCP SDU belonging to a Protocol Data Unit (PDU) set that includes at least one PDCP SDU for which a second discard timer has a remaining time value less than the time threshold.
2 . The method of claim 1 , further comprising:
receiving, from the BS, the time threshold associated with the LCG via the RRC signaling.
3 . The method of claim 1 , wherein triggering the DSR procedure comprises:
triggering the DSR procedure upon determining that a remaining time value of a discard timer associated with a PDCP SDU belonging to the LCG has become less than the time threshold and no DSR procedure has been triggered.
4 . The method of claim 1 , further comprising:
determining the buffer size for the LCG based on either a first predefined table or a second predefined table.
5 . The method of claim 4 , wherein:
the first predefined table is for eXtended Reality (XR) services.
6 . The method of claim 4 , wherein determining the buffer size for the LCG comprises:
determining the buffer size for the LCG based on the first predefined table in response to receiving a table indication from the BS via the RRC signaling; and
determining the buffer size for the LCG based on the second predefined table in a case that the table indication is not received from the BS.
7 . The method of claim 1 , wherein the DSR MAC CE further comprises a second field indicating a minimum remaining time of the delay-critical data for the LCG.
8 . The method of claim 1 , further comprising:
transmitting, to the BS, a Scheduling Request (SR) for requesting uplink resources for the transmission of the DSR MAC CE.
9 . A User Equipment (UE) for Delay Status Reporting (DSR), the UE comprising:
at least one processor; and
at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:
receive, from a base station (BS), configuration information related to a Logical Channel Group (LCG) via Radio Resource Control (RRC) signaling;
trigger a DSR procedure;
generate a DSR Medium Access Control (MAC) Control Element (CE) comprising a first field indicating a buffer size for the LCG; and
transmit the DSR MAC CE to the BS, wherein:
the buffer size indicates a total amount of delay-critical data for the LCG, and
the delay-critical data for the LCG comprises:
a first Packet Data Convergence Protocol (PDCP) Service Data Unit (SDU) for which a first discard timer has a remaining time value less than a time threshold associated with the LCG; and
a second PDCP SDU belonging to a Protocol Data Unit (PDU) set that includes at least one PDCP SDU for which a second discard timer has a remaining time value less than the time threshold.
10 . The UE of claim 9 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:
receive, from the BS, the time threshold associated with the LCG via the RRC signaling.
11 . The UE of claim 9 , wherein triggering the DSR procedure comprises:
triggering the DSR procedure upon determining that a remaining time value of a discard timer associated with a PDCP SDU belonging to the LCG has become less than the time threshold and no DSR procedure has been triggered.
12 . The UE of claim 9 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:
determine the buffer size for the LCG based on either a first predefined table or a second predefined table.
13 . The UE of claim 12 , wherein:
the first predefined table is for eXtended Reality (XR) services.
14 . The UE of claim 12 , wherein determining the buffer size for the LCG comprises:
determining the buffer size for the LCG based on the first predefined table in response to receiving a table indication from the BS via the RRC signaling; and
determining the buffer size for the LCG based on the second predefined table in a case that the table indication is not received from the BS.
15 . The UE of claim 9 , wherein the DSR MAC CE further comprises a second field indicating a minimum remaining time of the delay-critical data for the LCG.
16 . The UE of claim 9 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:
transmit, to the BS, a Scheduling Request (SR) for requesting uplink resources for the transmission of the DSR MAC CE.
17 . A Base Station (BS) for configuring Delay Status Reporting (DSR), the BS comprising:
at least one processor; and
at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the BS to:
transmit, to a user equipment (UE), configuration information related to a Logical Channel Group (LCG) via Radio Resource Control (RRC) signaling; and
receive, from the UE, a DSR Medium Access Control (MAC) Control Element (CE) comprising a first field indicating a buffer size for the LCG, wherein:
the buffer size indicates a total amount of delay-critical data for the LCG, and
the delay-critical data for the LCG comprises:
a first Packet Data Convergence Protocol (PDCP) Service Data Unit (SDU) for which a first discard timer has a remaining time value less than a time threshold associated with the LCG; and
a second PDCP SDU belonging to a Protocol Data Unit (PDU) set that includes at least one PDCP SDU for which a second discard timer has a remaining time value less than the time threshold.
18 . The BS of claim 17 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the BS to:
transmit, to the UE, the time threshold associated with the LCG via the RRC signaling.
19 . The BS of claim 17 , wherein the DSR MAC CE further comprises a second field indicating a minimum remaining time of the delay-critical data for the LCG.
20 . The BS of claim 17 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the BS to:
receive, from the UE, a Scheduling Request (SR) for requesting uplink resources for the transmission of the DSR MAC CE.