Network device, terminal device, and resource allocation method
The present application discloses a resource allocation method, relates to the communications field, and resolves a problem that overall system performance is degraded because all vehicles use fixed four-time transmission when broadcasting service data packets to nearby vehicles. A specific solution is as follows: A receiving unit receives a transmission resource request sent by a first terminal device; a determining unit determines a quantity of transmission times in response to the transmission resource request received by the receiving unit; an allocation unit allocates a resource set to the first terminal device according to the quantity of transmission times determined by the determining unit, where a quantity of resources included in the resource set is equal to the quantity of transmission times; and a sending unit sends, to the first terminal device, time-frequency resource location information of each resource in the resource set allocated by the allocation unit.
1. A resource allocation method, comprising:
sending a transmission resource request to a network device, wherein the transmission resource request requests transmission resources for transmitting a to-be-transmitted service data packet to an apparatus; and
after sending the transmission resource request to the network device:
receiving time-frequency resource location information of each resource in a resource set from the network device, wherein resources comprised in the resource set are a set of one or more physical resource blocks used to send the to-be-transmitted service data packet;
receiving a quantity of transmission times from the network device, wherein the quantity of transmission times is equal to a quantity of the resources comprised in the resource set;
sending scheduling assignment (SA) information to the apparatus, wherein a demodulation reference signal (DMRS) of the SA information carries the quantity of transmission times; and
sending, according to the time-frequency resource location information of each resource in the resource set, the to-be-transmitted service data packet to the apparatus using each resource in the resource set.
2. The method according to claim 1 , wherein the receiving the quantity of transmission times from the network device comprises:
receiving the quantity of transmission times from the network device by using at least one of dedicated radio resource control (RRC) signaling and a dedicated control channel.
3. The method according to claim 1 , wherein indication information added in the SA information is used to indicate the quantity of transmission times.
4. A first apparatus, comprising:
a transmitter, the transmitter configured to send a transmission resource request to a network device, wherein the transmission resource request requests transmission resources for transmitting a to-be-transmitted service data packet to a second apparatus; and
a receiver, the receiver configured to receive time-frequency resource location information of each resource in a resource set from the network device, wherein resources comprised in the resource set are a set of one or more physical resource blocks used to send the to-be-transmitted service data packet;
wherein the receiver is further configured to receive a quantity of transmission times from the network device, wherein the quantity of transmission times is equal to a quantity of the resources comprised in the resource set; and
the transmitter is further configured to send scheduling assignment (SA) information to the second apparatus, wherein a demodulation reference signal (DMRS) of the SA information carries the quantity of transmission times, and send, according to the time-frequency resource location information of each resource in the resource set received by the receiver, the to-be-transmitted service data packet to the second apparatus using each resource in the resource set.
5. The first apparatus according to claim 4 , wherein the receiver is configured to:
receive the quantity of transmission times from the network device by using at least one of dedicated RRC signaling and a dedicated control channel.
6. The first apparatus according to claim 4 , wherein the transmitter indicates the quantity of transmission times by using indication information added in the SA information indicates the quantity of transmission times.
7. A second apparatus, comprising:
a receiver, the receiver configured to receive scheduling assignment (SA) information from a first apparatus, wherein a demodulation reference signal (DMRS) of the SA information carries a quantity of transmission times; and
a processor, the processor configured to obtain the quantity of transmission times; wherein
the receiver is further configured to receive, according to the quantity of transmission times obtained by the processor, a to-be-transmitted service data packet from the first apparatus using each resource in a resource set, wherein a quantity of resources comprised in the resource set is equal to the quantity of transmission times, and the resources are a set of one or more physical resource blocks.
8. The second apparatus according to claim 7 , wherein indication information added in the SA information received by the receiver indicates the quantity of transmission times; and
the processor is configured to determine the quantity of transmission times according to the indication information.