Communications method and system, and related device

1. A communications method, comprising:

receiving, by user equipment (UE), quasi-co-location (QCL) indication signaling from a base station, wherein the QCL indication signaling is used to indicate that a QCL relationship exists between antenna ports of at least two serving cells in a same serving cell group, and wherein the same serving cell group is a group obtained after the base station groups serving cells allocated to the UE or is a group predefined according to a preset rule;

determining, by the UE and based on the QCL indication signaling, to receive reference signals of the serving cells by using a same receive beam or transmit reference signals of the serving cells by using a same transmit beam in the at least two serving cells whose antenna ports are in the QCL relationship and that are in the same serving cell group;

receiving, by the UE, measurement pilots from the base station by using beams of the at least two serving cells; and

determining, by the UE based on the beams of the at least two serving cells, a QCL determining indication or a beam ID of a beam having target channel quality, wherein the QCL determining indication is a determining bit that is obtained by the UE through estimation and that is used to indicate whether the beams of the at least two serving cells meet a QCL relationship between spatial characteristic parameters.

2. The communications method according to claim 1 , wherein the same serving cell group is a timing advance group (TAG), and wherein serving cells in a same TAG have a same timing advance and a same timing reference cell.

3. The communications method according to claim 1 , wherein the same serving cell group is a group obtained after the base station groups the serving cells allocated to the UE, and the method further comprises:

receiving, by the UE, information that is about the same serving cell group and that is from the base station by using higher layer signaling.

4. A communications method, comprising:

receiving, by user equipment (UE), quasi-co-location (QCL) indication signaling from a base station, wherein the QCL indication signaling is used to indicate that a QCL relationship exists between antenna ports of serving cells in different serving cell groups, and wherein the different serving cell groups are groups obtained after the base station groups serving cells allocated to the UE or are groups predefined according to a preset rule;

determining, by the UE based on the QCL indication signaling, to receive reference signals of the serving cells by using a same receive beam or transmit reference signals of the serving cells by using a same transmit beam in the serving cells whose antenna ports are in the QCL relationship and that are in the different serving cell groups;

receiving, by the UE, measurement pilots from the base station by using beams of the serving cells in the different serving cell groups; and

determining, by the UE and based on the beams of the serving cells in the different serving cell groups, a QCL determining indication or a beam ID of a beam having target channel quality, wherein the QCL determining indication is a determining bit that is obtained by the UE through estimation and that is used to indicate whether the beams of the at least two serving cells meet a QCL relationship between spatial characteristic parameters.

5. The communications method according to claim 4 , wherein a serving cell group is a timing advance group (TAG), and wherein serving cells in a same TAG have a same timing advance and a same timing reference cell.

6. The communications method according to claim 4 , wherein the method further comprises:

receiving, by the UE, information that is about the different serving cell groups and that is from the base station by using higher layer signaling.

7. A terminal, comprising:

a receiver, wherein the receiver is configured to:

receive quasi-co-location (QCL) indication signaling from a base station, wherein the QCL indication signaling is used to indicate that a QCL relationship exists between antenna ports of at least two serving cells in a same serving cell group, and wherein the same serving cell group is a group obtained after the base station groups serving cells allocated to the terminal or is a group predefined according to a preset rule;

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, based on the QCL indication signaling, to receive reference signals of the serving cells by using a same receive beam or transmit reference signals of the serving cells by using a same transmit beam in the at least two serving cells whose antenna ports are in the QCL relationship and that are in the same serving cell group;

wherein the receiver is further configured to receive measurement pilots from the base station by using beams of the at least two serving cells;

wherein the at least one processor determines, based on the beams of the at least two serving cells, a QCL determining indication or a beam ID of a beam having target channel quality, wherein the QCL determining indication is a determining bit that is obtained by the UE through estimation and that is used to indicate whether the beams of the at least two serving cells meet a QCL relationship between spatial characteristic parameters; and

wherein the terminal further comprises a transmitter, the transmitter configured to feed back the QCL determining indication or the beam ID to the base station.

8. The terminal according to claim 7 , wherein the same serving cell group is a timing advance group (TAG), and wherein serving cells in a same TAG have a same timing advance and a same timing reference cell.