Communication method, user equipment and base station
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A communication method, a user equipment and a base station are provided. The communication method includes transmitting a request signaling to a base station to request the base station to perform at least one of the following operations, transmitting at least one downlink signal, receiving at least one uplink signal, and entering an active state. In accordance with the embodiments of the disclosure, the influence of the dormancy of the base station on user experience and transmission delay is reduced when the base station enters a dormant state to reduce power consumption.
1 . A method executed by a user equipment (UE) in a communication system, the method comprising:
identifying that there is uplink data arriving at the UE, but a downlink is out of synchronization and a reference signal for downlink synchronization is muted;
transmitting, to a base station, a first request signaling to request the base station to transmit the reference signal for downlink synchronization;
transmitting, to the base station, a second request signaling to request the base station to receive a physical random access channel (PRACH); and
transmitting, to the base station, a third request signaling to request the base station to enter the active state.
2 . The method according to claim 1 ,
wherein the base station comprises a base station in a dormant state, and
wherein the base station in the dormant state comprises at least one of the following situations:
not transmitting the at least one downlink signal,
not receiving the at least one uplink signal,
not transmitting downlink signals, and
not receiving uplink signals except for the request signaling.
3 . The method according to claim 1 , wherein the reference signal for downlink synchronization comprises at least one of the following:
a synchronization signal block (SSB),
a discovery reference signal (DRS), the DRS having more physical resource elements used for reference signal mapping than the SSB, and
a non-cell defining SSB (NCD-SSB).
4 . The method according to claim 1 , wherein the reference signal for downlink synchronization being muted is determined based on at least one of the following information:
information indicated by the base station regarding that the reference signal for downlink synchronization is muted at a specific occasion,
information indicated by the base station regarding that the base station enters a dormant state, the reference signal for downlink synchronization being muted when the base station is in the dormant state, and
information of a dormant slot indicated by the base station, the reference signal for downlink synchronization that overlaps with the dormant slot being muted.
5 . The method according to claim 1 ,
wherein a first time-domain location of the reference signal for downlink synchronization is determined based on configuration information about the reference signal for downlink synchronization indicated by the base station, and/or,
wherein a second time-domain location of the first request signaling is determined based on configuration information about the first request signaling indicated by the base station, and/or,
wherein the second time-domain location is determined based on the first time-domain location and a time-domain offset relative to the first time-domain location indicated by the base station, and/or
wherein the first time-domain location is determined based on the second time-domain location and a time-domain offset relative to the second time-domain location indicated by the base station.
6 . The method according to claim 1 , wherein the request signaling is used for requesting the base station to transmit the reference signal for downlink synchronization in N consecutive cycles, where the N is a positive integer.
7 . The method according to claim 1 , wherein the transmitting of the second request signaling to the base station comprises:
when there is uplink data arriving at the UE but the PRACH is muted, transmitting the second request signaling to the base station.
8 . The method according to claim 1 , wherein the PRACH being muted is determined based on at least one of the following information:
information indicated by the base station regarding that a periodic PRACH is muted at a specific occasion,
information indicated by the base station regarding that the base station enters a dormant state, the PRACH being muted when the base station is in the dormant state, and
information of a dormant slot indicated by the base station, the PRACH that overlaps with the dormant slot being muted.
9 . The method according to claim 1 ,
wherein a third time-domain location where the base station receives the PRACH is determined based on configuration information about the PRACH indicated by the base station, and/or,
wherein a fourth time-domain location of the second request signaling is determined based on configuration information about the second request signaling indicated by the base station, and/or
wherein the fourth time-domain location is determined based on the third time-domain location and a time-domain offset relative to the third time-domain location indicated by the base station, and/or,
wherein the third time-domain location is determined based on the fourth time-domain location and a time-domain offset relative to the fourth time-domain location indicated by the base station.
10 . The method according to claim 1 , wherein the transmitting of the third request signaling to the base station comprises:
when there is uplink data arriving at the UE but the base station is in a dormant state, transmitting the third request signaling to the base station.
11 . The method according to claim 1 ,
wherein a plurality of resources is configured to transmit the third request signaling, and each resource corresponds to a different length of time duration, and
wherein the transmitting a third signaling to the base station comprises:
transmitting the third request signaling to the base station through one of the plurality of resources, to request the base station to enter the active state and last for the duration of time corresponding to the resource.
12 . The method according to any one of claim 1 , wherein the transmitting of the request signaling to the base station comprises:
transmitting the request signaling on a primary cell to request the base station to perform at least one of the following operations on a secondary cell:
transmitting the at least one downlink signal,
receiving the at least one uplink signal, and
entering an active state.
13 . The method according to any one of claim 1 , wherein the transmitting of the request signaling to the base station comprises at least one of the following situations:
when there is uplink data arriving at the UE on a preset logical channel, transmitting the request signaling to the base station;
when there is uplink data arriving at the UE and the latest available PRACH transmission cannot satisfy a delay requirement of the arrived data, transmitting the request signaling to the base station; and
when there is uplink data arriving at the UE and a priority of the arrived data is greater than a priority threshold, transmitting the request signaling to the base station.
14 . A method executed by a base station in a communication system, the method comprising:
receiving, from a user equipment (UE), a first request signaling to request the base station to transmit a reference signal for downlink synchronization in case that there is uplink data arriving at the UE, but a downlink is out of synchronization and the reference signal for downlink synchronization is muted;
receiving, from the UE, a second request signaling to request the base station to receive a physical random access channel (PRACH); and
receiving, from the UE, a third request signaling to request the base station to enter the active state.
15 . The method according to claim 14 , wherein the reference signal for downlink synchronization comprises at least one of the following:
a synchronization signal block (SSB),
a discovery reference signal (DRS), the DRS having more physical resource elements used for reference signal mapping than the SSB, and
a non-cell defining SSB (NCD-SSB).
16 . A user equipment (UE), comprising:
a transceiver; and
at least one processor coupled to the transceiver and configured to control to:
identify that there is uplink data arriving at the UE, but a downlink is out of synchronization and a reference signal for downlink synchronization is muted,
transmit, to a base station, a first request signaling to request the base station to transmit the reference signal for downlink synchronization,
transmit, to the base station, a second request signaling to request the base station to receive a physical random access channel (PRACH), and
transmit, to the base station, a third request signaling to request the base station to enter the active state.
17 . The UE according to claim 16 ,
wherein the base station comprises a base station in a dormant state, and
wherein the base station in the dormant state comprises at least one of the following situations:
not transmitting the at least one downlink signal,
not receiving the at least one uplink signal,
not transmitting downlink signals, and
not receiving uplink signals except for the request signaling.
18 . A base station, comprising:
a transceiver; and
a processor coupled to the transceiver and configured to control to:
receive, from a user equipment (UE), a first request signaling to request the base station to transmit a reference signal for downlink synchronization in case that there is uplink data arriving at the UE, but a downlink is out of synchronization and the reference signal for downlink synchronization is muted,
receive, from the UE, a second request signaling to request the base station to receive a physical random access channel (PRACH), and
receive, from the UE, a third request signaling to request the base station to enter the active state.