Communications method and apparatus
This application provides a communications method and apparatus. The method includes: obtaining, by a media access control (MAC) entity, M radio link control (RLC) protocol data units PDUs, where M is an integer greater than or equal to 2; and generating, by the MAC entity, N media access control MAC protocol data units (PDUs) based on a logical channel corresponding to each of the M RLC PDUs, where any two RLC PDUs corresponding to a same logical channel and having consecutive RLC sequence numbers are carried in different MAC PDUs, and N is an integer greater than or equal to 2. Consecutive RLC PDUs are placed into different MAC PDUs, so that a continuous packet loss of a same service can be avoided, and transmission reliability can be improved.
1. A communications method, wherein the method comprises:
obtaining, by a media access control (MAC) entity, M radio link control (RLC) protocol data units (PDUs), wherein M is an integer greater than or equal to 2; and
generating, by the MAC entity, N MAC PDUs based on a logical channel corresponding to each of the M RLC PDUs, wherein any two RLC PDUs corresponding to a same logical channel and having consecutive RLC sequence numbers are carried in different MAC PDUs, and N is an integer greater than or equal to 2;
wherein an interval between MAC sequence numbers of a first MAC PDU and a second MAC PDU in the N MAC PDUs is greater than or equal to k, k is an integer greater than or equal to 2, the first MAC PDU carries a first RLC PDU on a first logical channel, the second MAC PDU carries a second RLC PDU on the first logical channel, and RLC sequence numbers of the first RLC PDU and the second RLC PDU are consecutive.
2. The method according to claim 1 , wherein a third MAC PDU in the N MAC PDUs carries T RLC PDUs corresponding to a same logical channel, T is an integer greater than or equal to 2, T is less than M, an interval between RLC sequence numbers of any two of the T RLC PDUs is greater than or equal to t, and t is an integer greater than or equal to 2.
3. The method according to claim 1 , wherein a third MAC PDU in the N MAC PDUs carries T RLC PDUs corresponding to a same logical channel, T is an integer greater than or equal to 2, T is less than M, an interval between RLC sequence numbers of any two of the T RLC PDUs is greater than or equal to t, and t is an integer greater than or equal to 2.
4. A communications method, wherein the method comprises:
obtaining, by a media access control (MAC) entity, M radio link control (RLC) protocol data units (PDUs), wherein M is an integer greater than or equal to 2; and
generating, by the MAC entity, N MAC PDUs based on a flow corresponding to each of the M RLC PDUs, wherein any two RLC PDUs corresponding to a same flow that are obtained in consecutive order are carried in different MAC PDUs, and N is an integer greater than or equal to 2;
wherein an interval between MAC sequence numbers of a first MAC PDU and a second MAC PDU in the N MAC PDUs is greater than or equal to k, k is an integer greater than or equal to 2, the first MAC PDU carries a first RLC PDU of a first flow, the second MAC PDU carries a second RLC PDU of the first flow, and the first RLC PDU and the second RLC PDU are obtained in consecutive order.
5. The method according to claim 4 , wherein a third MAC PDU in the N MAC PDUs carries T RLC PDUs corresponding to a same flow, T is an integer greater than or equal to 2, T is less than M, and any two of the T RLC PDUs are obtained in nonconsecutive order.
6. The method according to claim 4 , wherein a third MAC PDU in the N MAC PDUs carries T RLC PDUs corresponding to a same flow, T is an integer greater than or equal to 2, T is less than M, and any two of the T RLC PDUs are obtained in nonconsecutive order.
7. The method according to claim 4 , wherein the generating, by the MAC entity, of the N MAC PDUs based on the flow corresponding to each of the M RLC PDUs comprises:
determining, by the MAC entity based on a flow identifier carried in each RLC PDU, the flow corresponding to each of the M RLC PDUs, wherein the flow identifier is carried in a service data adaptation protocol SDAP header or a packet data convergence protocol PDCP header.
8. The method according to claim 4 , wherein the generating, by the MAC entity, of the N MAC PDUs based on the flow corresponding to each of the M RLC PDUs comprises:
determining, by the MAC entity based on a flow identifier carried in each RLC PDU, the flow corresponding to each of the M RLC PDUs, wherein the flow identifier is carried in a service data adaptation protocol SDAP header or a packet data convergence protocol PDCP header.
9. The method according to claim 5 , wherein the generating, by the MAC entity, of the N MAC PDUs based on the flow corresponding to each of the M RLC PDUs comprises:
determining, by the MAC entity based on a flow identifier carried in each RLC PDU, the flow corresponding to each of the M RLC PDUs, wherein the flow identifier is carried in a service data adaptation protocol SDAP header or a packet data convergence protocol PDCP header.
10. A communications apparatus, comprising:
a transceiver unit, configured to obtain M radio link control (RLC) protocol data units PDUs, wherein M is an integer greater than or equal to 2; and
a processing unit, configured to generate N media access control (MAC) protocol data units PDUs based on a logical channel corresponding to each of the M RLC PDUs, wherein any two RLC PDUs corresponding to a same logical channel and having consecutive RLC sequence numbers are carried in different MAC PDUs, and N is an integer greater than or equal to 2;
wherein an interval between MAC sequence numbers of a first MAC PDU and a second MAC PDU in the N MAC PDUs generated by the processing unit is greater than or equal to k, k is an integer greater than or equal to 2, the first MAC PDU carries a first RLC PDU on a first logical channel, the second MAC PDU carries a second RLC PDU on the first logical channel, and RLC sequence numbers of the first RLC PDU and the second RLC PDU are consecutive.
11. The apparatus according to claim 10 , wherein a third MAC PDU in the N MAC PDUs generated by the processing unit carries T RLC PDUs corresponding to a same logic al channel, T is an integer greater than or equal to 2, T is less than M, an interval between RLC sequence numbers of any two of the T RLC PDUs is greater than or equal to t, and t is an integer greater than or equal to 2.
12. The apparatus according to claim 10 , wherein a third MAC PDU in the N MAC PDUs generated by the processing unit carries T RLC PDUs corresponding to a same logical channel, T is an integer greater than or equal to 2, T is less than M, an interval between RLC sequence numbers of any two of the T RLC PDUs is greater than or equal to t, and t is an integer greater than or equal to 2.