Resource configuration method, apparatus, and system
This application discloses a resource configuration method, an apparatus, and a system, and relates to the field of communications technologies. The method includes: receiving PDCCH signaling; switching to a target uplink BWP; and sending a preamble sequence by using a PRACH resource included in the target uplink BWP, where the PDCCH signaling is used to trigger a random access procedure.
1. A method comprising:
receiving, by a device, physical downlink control channel (PDCCH) signaling, wherein the PDCCH signaling triggers a random access procedure;
switching, by the device, to a target uplink bandwidth part (BWP), wherein the target uplink BWP comprises a physical random access channel (PRACH) resource, and wherein:
the target uplink BWP is an uplink BWP for initial random access; or
the target uplink BWP is a preconfigured uplink BWP, and the preconfigured uplink BWP comprises the PRACH resource; and
sending, by the device, in a first time unit, a preamble sequence on the PRACH resource comprised in the target uplink BWP, wherein there is a first time period between the first time unit and a second time unit, and the second time unit is a time unit in which the PDCCH signaling is received at the device.
2. The method according to claim 1 , wherein the PDCCH signaling comprises an identifier of the target uplink BWP.
3. The method according to claim 1 , wherein:
the first time period is an absolute time.
4. The method according to claim 1 , wherein a subcarrier spacing corresponding to the first time unit is a subcarrier spacing of a downlink BWP, the PDCCH signaling is received on the downlink BWP, and a subcarrier spacing corresponding to the second time unit is a subcarrier spacing corresponding to the target uplink BWP.
5. The method according to claim 1 , wherein the method further comprises:
receiving uplink timing advance (TA); and
sending data according to the uplink TA.
6. A method comprising:
sending, by a device, physical downlink control channel (PDCCH) signaling, wherein the PDCCH signaling triggers a random access procedure; and
in response to the random access procedure, receiving, by the device, a preamble sequence on a physical random access channel (PRACH) resource comprised in a target uplink bandwidth part (BWP), wherein:
the target uplink BWP is an uplink BWP for initial random access; or
the target uplink BWP is a preconfigured uplink BWP, and the preconfigured uplink BWP comprises the PRACH resource;
determining timing advance (TA) according to the preamble sequence; and
sending the TA on a target downlink BWP, wherein the target downlink BWP corresponds to the target uplink BWP or the target downlink BWP is a currently activated downlink BWP.
7. The method according to claim 6 , wherein the PDCCH signaling comprises an identifier of the target uplink BWP.
8. An apparatus, comprising:
a non-transitory memory configured to store a program instruction; and
a processor configured to invoke and execute the program instruction stored in the non-transitory memory to:
receive physical downlink control channel (PDCCH) signaling, wherein the PDCCH signaling triggers a random access procedure;
switch to a target uplink bandwidth part (BWP), wherein the target uplink BWP comprises a physical random access channel (PRACH) resource, wherein:
the target uplink BWP is an uplink BWP for initial random access; or
the target uplink BWP is a preconfigured uplink BWP, and the preconfigured uplink BWP comprises the PRACH resource; and
send, in a first time unit, a preamble sequence on the PRACH resource comprised in the target uplink BWP, wherein there is a first time period between the first time unit and a second time unit, and the second time unit is a time unit in which the PDCCH signaling is received at the apparatus.
9. The apparatus according to claim 8 , wherein the PDCCH signaling comprises an identifier of the target uplink BWP.
10. The apparatus according to claim 8 , wherein:
the first time period is an absolute time.
11. The apparatus according to claim 8 , wherein a subcarrier spacing corresponding to the first time unit is a subcarrier spacing of a downlink BWP, the PDCCH signaling is received on the downlink BWP, and a subcarrier spacing corresponding to the second time unit is a subcarrier spacing corresponding to the target uplink BWP.
12. The apparatus according to claim 8 , wherein the processor is further configured to:
receive uplink timing advance (TA); and
send data according to the uplink TA.
13. The method according to claim 1 , wherein the first time period is k third time units, a duration of each of the k third time units is predefined or notified by signaling, and k is a positive integer.
14. The apparatus according to claim 8 , wherein the first time period is k third time units, a duration of each the k third time units is predefined or notified by using signaling, and k is a positive integer.