Communication method and apparatus
Example communication methods and apparatus are provided. One example method includes determining a first transmission resource in a first resource pool by a first terminal device, where each transmission resource in the first resource pool occupies some or all symbols of one slot in time domain, and each transmission resource in the first resource pool occupies one or more sub-channels in frequency domain. The first terminal device sends the first message to a second terminal device by using the first transmission resource.
1 . A communication method, comprising:
determining, by a first terminal device, a first transmission resource in a first resource pool, wherein each transmission resource in the first resource pool occupies some or all symbols of one slot in a time domain, and each transmission resource in the first resource pool occupies one or more sub-channels in a frequency domain; and
sending, by the first terminal device, a first message to a second terminal device by using the first transmission resource, wherein the first transmission resource occupied by the first message is less than one slot.
2 . The communication method according to claim 1 , further comprising:
determining, by the first terminal device, at least one transmission resource in the first resource pool; and
receiving, by the first terminal device, a second message from the second terminal device on the at least one transmission resource.
3 . The communication method according to claim 2 , further comprising:
determining, by the first terminal device, the first message based on the second message, wherein the first message is used by the second terminal device to determine a third transmission resource in a second resource pool, and the third transmission resource is used by the second terminal device to send a third message; and
wherein the third message is carried on at least one of a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), or a physical sidelink feedback channel (PSFCH), and each transmission resource in the second resource pool occupies some or all symbols of one slot in time domain.
4 . The communication method according to claim 3 , wherein the first resource pool and the second resource pool are subject to time division multiplexing.
5 . The communication method according to claim 2 , wherein the determining, by the first terminal device, at least one transmission resource in the first resource pool comprises:
determining, by the first terminal device, an index of the at least one transmission resource based on an index of the first terminal device, wherein the at least one transmission resource in the first resource pool is a transmission resource used to receive the second message.
6 . The communication method according to claim 2 , wherein the determining, by the first terminal device, at least one transmission resource in the first resource pool comprises:
determining, by the first terminal device, an index of a second transmission resource based on an index of the first terminal device and an index of the second terminal device, wherein the second transmission resource in the first resource pool is a transmission resource used to receive the second message.
7 . The communication method according to claim 1 , wherein:
at least one of a time domain start location or a quantity of occupied time domain symbols of each transmission resource in the first resource pool is preconfigured in the first terminal device, or
at least one of a time domain start location or a quantity of occupied time domain symbols of each transmission resource in the first resource pool is determined by the first terminal device based on configuration signaling from a network device.
8 . The communication method according to claim 7 , wherein the configuration signaling is a system information block (SIB), radio resource control (RRC) signaling, or physical layer control information.
9 . The communication method according to claim 1 , wherein a first time domain symbol occupied by each transmission resource in the first resource pool is used for automatic gain control (AGC) adjustment performed by a receive end.
10 . The communication method according to claim 1 , wherein the determining, by a first terminal device, a first transmission resource in a first resource pool comprises:
determining, by the first terminal device based on at least one of an index of the first terminal device or an index of the second terminal device, an index corresponding to the first transmission resource, wherein the first transmission resource in the first resource pool is a transmission resource used to send the first message.
11 . A communication method, comprising:
determining, by a second terminal device, at least one transmission resource in a first resource pool; and
receiving, by the second terminal device, a first message from a first terminal device on the at least one transmission resource, wherein each transmission resource in the first resource pool occupies some or all symbols of one slot in a time domain, and each transmission resource in the first resource pool occupies one or more sub-channels in a frequency domain, and wherein the at least one transmission resource occupied by the first message is less than one slot.
12 . The communication method according to claim 11 , further comprising:
determining, by the second terminal device, a second transmission resource in the first resource pool; and
sending, by the second terminal device, a second message to the first terminal device by using the second transmission resource.
13 . The communication method according to claim 12 , further comprising:
determining, by the second terminal device, a third transmission resource in a second resource pool based on the first message, wherein the second message is used by the first terminal device to determine the first message; and
sending, by the second terminal device, a third message using the third transmission resource;
wherein the third message is carried on at least one of a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), or a physical sidelink feedback channel (PSFCH), and each transmission resource in the second resource pool occupies some or all symbols of one slot in time domain.
14 . The communication method according to claim 12 , wherein the determining, by the second terminal device, a second transmission resource in the first resource pool comprises:
determining, by the second terminal device, an index of the second transmission resource based on the index of the first terminal device and the index of the second terminal device, wherein the second transmission resource in the first resource pool is a transmission resource used to send the second message.
15 . The communication method according to claim 11 , wherein:
at least one of a time domain start location or a quantity of occupied time domain symbols of each transmission resource in the first resource pool is preconfigured in the second terminal device; or
at least one of a time domain start location or a quantity of occupied time domain symbols of each transmission resource is determined by the second terminal device based on configuration signaling from a network device.
16 . The communication method according to claim 15 , wherein the configuration signaling is a system information block (SIB), radio resource control (RRC) signaling, or physical layer control signaling.
17 . The communication method according to claim 11 , wherein a first time domain symbol occupied by each transmission resource in the first resource pool is used for automatic gain control (AGC) adjustment performed by a receive end.
18 . The communication method according to claim 11 , wherein the determining, by a second terminal device, at least one transmission resource in a first resource pool comprises:
determining, by the second terminal device based on an index of the second terminal device, an index of a transmission resource in the first resource pool, wherein the transmission resource in the first resource pool is a transmission resource used to receive the first message.
19 . The communication method according to claim 11 , wherein the determining, by a second terminal device, at least one transmission resource in a first resource pool comprises:
determining, by the second terminal device, an index of a first transmission resource based on an index of the second terminal device and an index of the first terminal device, wherein the first transmission resource in the first resource pool is a transmission resource used to receive the first message.
20 . A communication apparatus, comprising:
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
determine a first transmission resource in a first resource pool, wherein each transmission resource in the first resource pool occupies some or all symbols of one slot in a time domain, and each transmission resource in the first resource pool occupies one or more sub-channels in a frequency domain; and
send a first message to a second terminal device by using the first transmission resource, wherein the first transmission resource occupied by the first message is less than one slot.