Data transmission method, network device, and user equipment
Embodiments of the present invention provide a data transmission method, a network device, and user equipment, including: sending, by the network device, first indication information and second indication information to the user equipment, where the first indication information is used to indicate a frequency domain resource of a physical random access channel of the user equipment, the second indication information is physical layer control signaling, the second indication information is used to indicate a time domain resource of the physical random access channel, and a random access resource corresponding to the frequency domain resource and the time domain resource is used to carry random access information of the user equipment. In the embodiments of the present invention, a resource of a random access channel is dynamically indicated by using the physical layer control signaling, to improve random access resource allocation flexibility.
1. A data transmission method, comprising:
determining indication information;
sending the indication information to user equipment, wherein the indication information is physical layer control signaling, the indication information indicates a frequency domain resource and a time domain resource that are of a physical random access channel of the user equipment, a random access resource determined by the frequency domain resource and the time domain resource carries random access information of the user equipment, the indication information indicates whether a time domain resource unit n+k is used as the time domain resource of the physical random access channel based on whether the indication information is scrambled by using a preset identifier, wherein the indication information indicates that the time domain resource unit n+k is used as the time domain resource of the physical random access channel if the indication information is scrambled by using the preset identifier, and the indication information indicates that the time domain resource unit n+k is not used as the time domain resource of the physical random access channel if the indication information is not scrambled by using the preset identifier; and
wherein the indication information is carried on a time domain resource unit n; and
the time domain resource is the time domain resource unit n+k that is separated from the time domain resource unit n by k time domain resource units, n is an integer greater than or equal to 0, and k is an integer greater than or equal to 0.
2. The method according to claim 1 , wherein the time domain resource unit is a preset transmission time interval in time domain, or the time domain resource unit is a preset transmission time period in time domain.
3. The method according to claim 1 , wherein the indication information comprises a second indicator field, and the second indicator field indicates the frequency domain resource.
4. A communications apparatus, comprising:
at least one processor, an interface circuit, a memory, and a bus, wherein the at least one processor, the interface circuit, and the memory are connected and communicate with one another by using the bus;
the interface circuit is configured to communicate with another device under control of the at least one processor, and the memory stores executable program code for execution by the at least one processor, wherein the executable program code, when executed, cause the apparatus to Perform operations comprising:
receiving indication information from a network device, wherein the indication information is physical layer control signaling, the indication information indicates a frequency domain resource and a time domain resource that are of a physical random access channel of the communications apparatus, a random access resource determined by the frequency domain resource and the time domain resource carries random access information of the communications apparatus, the indication information indicates whether a time domain resource unit n+k is used as the time domain resource of the physical random access channel based on whether the indication information is scrambled by using a preset identifier, wherein the indication information indicates that the time domain resource unit n+k is used as the time domain resource of the physical random access channel if the indication information is scrambled by using the preset identifier, and the indication information indicates that the time domain resource unit n+k is not used as the time domain resource of the physical random access channel if the indication information is not scrambled by using the preset identifier;
sending the random access information to the network device;
wherein the indication information is carried on a time domain resource unit n; and
the time domain resource is the time domain resource unit n+k that is separated from the time domain resource unit n by k time domain resource units, n is an integer greater than or equal to 0, and k is an integer greater than or equal to 0.
5. The communications apparatus according to claim 4 , wherein the time domain resource unit is a preset transmission time interval in time domain, or the time domain resource unit is a preset transmission time period in time domain.
6. The communications apparatus according to claim 4 , wherein the indication information comprises a second indicator field, and the second indicator field indicates the frequency domain resource.
7. A network device, comprising:
at least one processor, an interface circuit, a memory, and a bus, wherein the at least one processor, the interface circuit, and the memory are connected and communicate with one another by using the bus;
the interface circuit is configured to communicate with user equipment under control of the at least one processor, and the memory stores executable program code for execution by the at least one processor, wherein the executable program code, when executed, cause the network device to perform operations comprising:
determining indication information;
sending the indication information to the user equipment, wherein the indication information is a physical layer control signaling, the indication information indicates a frequency domain resource and a time domain resource that are of a physical random access channel of the user equipment, a random access resource determined by the frequency domain resource and the time domain resource carries random access information of the user equipment, the indication information indicates whether a time domain resource unit n+k is used as the time domain resource of the physical random access channel based on whether the indication information is scrambled by using a preset identifier, wherein the indication information indicates that the time domain resource unit n+k is used as the time domain resource of the physical random access channel if the indication information is scrambled by using the preset identifier, and the indication information indicates that the time domain resource unit n+k is not used as the time domain resource of the physical random access channel if the indication information is not scrambled by using the preset identifier; and
wherein the indication information is carried on a time domain resource unit n; and
the time domain resource is the time domain resource unit n+k that is separated from the time domain resource unit n by k time domain resource units, n is an integer greater than or equal to 0, and k is an integer greater than or equal to 0.
8. The network device according to claim 7 , wherein the time domain resource unit is a preset transmission time interval in time domain, or the time domain resource unit is a preset transmission time period in time domain.
9. The network device according to claim 7 , wherein the indication information comprises a second indicator field, and the second indicator field indicates the frequency domain resource.