Wireless communication method and device
Embodiments of the present invention provide a wireless communication method and a device. The wireless communication method includes: determining, by a base station, a transmission mode used to send data to a terminal in a current scheduling period, where the transmission mode is one of a paired transmission mode or a non-paired transmission mode; and sending, by the base station to the terminal, information indicating a terminal type corresponding to the transmission mode. According to the method and device, the terminal may perform corresponding processing according to the transmission mode, thereby improving processing efficiency. For example, the terminal may select an adaptive receiving algorithm to demodulate a signal, to improve demodulation efficiency and accuracy.
1. A wireless communication method, applied to a multiuser superposition transmission (MUST) system, the method comprising:
receiving, by a terminal, information that indicates a terminal type corresponding to a transmission mode from a base station, wherein the transmission mode is used to send data to the terminal in a current scheduling period, and is one of a paired transmission mode or a non-paired transmission mode;
receiving, by the terminal, a power parameter that is used to determine downlink data transmit power, from the base station, wherein the power parameter comprises PA MUST and P A , and PA MUST is a power parameter in the MUST system; and
determining, by the terminal according to the information, a transmission mode used by the terminal wherein the terminal determines the transmission mode is a paired transmission mode, according to the PA MUST downlink data transmit power and P A is a power parameter defined in an existing protocol.
2. The method according to claim 1 , wherein the terminal determines, according to energy per resource element of a cell-specific reference signal, the power parameter used to determine the downlink data transmit power, and the information indicating the transmission mode used by the base station to send data to the terminal in the current scheduling period, downlink data transmit power that is used by the base station to send data to the terminal.
3. The method according to claim 1 , wherein the method further comprises:
obtaining, by the terminal, downlink data transmit power ratio information, wherein the downlink data transmit power ratio information is a downlink data transmit power ratio of the terminal in the paired transmission mode.
4. The method according to claim 3 , wherein the obtaining, by the terminal, downlink data transmit power ratio information comprises:
receiving, by the terminal, one of the downlink data transmit power ratio information from the base station and indication information of the downlink data transmit power ratio information; and
obtaining, by the terminal, one of the downlink data transmit power ratio information according to the received downlink data transmit power ratio information and the received indication information of the downlink data transmit power ratio information.
5. The method according to claim 3 , wherein if the terminal uses the paired transmission mode, that the terminal determines, according to energy per resource element of a cell-specific reference signal, the power parameter used to determine the downlink data transmit power, and the information indicating the transmission mode used by the base station to send data to the terminal in the current scheduling period, downlink data transmit power that is used by the base station to send data to the terminal comprises:
determining, by the terminal according to the downlink data transmit power ratio/coefficient information, a downlink data transmit power share occupied by the terminal in downlink data transmit power of a pair of terminals in the paired transmission mode; and
determining, by the terminal, the downlink data transmit power according to the downlink data transmit power share, the energy per resource element of the cell-specific reference signal, the PA MUST , and the information indicating the transmission mode used by the base station to send data to the terminal in the current scheduling period.
6. The method according to claim 3 , wherein the method further comprises:
demodulating, by the terminal, received downlink data according to the determined downlink data transmit power, and feeding back, to the base station, information indicating whether demodulation succeeds.
7. The method according to claim 1 , wherein the method further comprises:
receiving, by the terminal, a first field comprising at least one of indication information of a demodulation reference signal (DMRS) port of a paired terminal of the terminal and indication information of a modulation scheme of a paired terminal of the terminal.
8. The method according to claim 7 , wherein the first field indicates a type of the terminal, and the demodulation pilot DMRS port and the modulation scheme of the paired terminal of the terminal in a joint coding manner.
9. An apparatus in a multiuser superposition transmission (MUST) system, the apparatus comprising:
a receiver, configured to receive information that indicates a terminal type corresponding to a transmission mode from a base station, wherein the transmission mode is a transmission mode that is used to send data to a terminal in a current scheduling period, and is one of a paired transmission mode or a non-paired transmission mode; and receive a power parameter that is used to determine downlink data transmit power, from the base station, wherein the power parameter comprises PA MUST and P A , and PA MUST is a power parameter in the MUST system; and
a processor, configured to determine, according to the information received by the receiving module, a transmission mode used by the terminal wherein the processor determines the transmission mode is a paired transmission mode, according to the PA MUST , downlink data transmit power and P A is a power parameter defined in an existing protocol.
10. The apparatus according to claim 9 , wherein the processor is further configured to determine, according to energy per resource element of a cell-specific reference signal, the power parameter used to determine the downlink data transmit power, and the information indicating the transmission mode used by the base station to send data to the terminal in the current scheduling period, downlink data transmit power that is used by the base station to send data to the terminal.
11. The apparatus according to claim 9 , wherein the processor is further configured to obtain downlink data transmit power ratio information, wherein the downlink data transmit power ratio information is a downlink data transmit power ratio of the terminal in the paired transmission mode.
12. The apparatus according to claim 11 , wherein the receiver is further configured to receive one of the downlink data transmit power ratio information from the base station and indication information of the downlink data transmit power ratio information;
and the processor is further configured to obtain the downlink data transmit power ratio information according to the received downlink data transmit power ratio information or the received indication information of the downlink data transmit power ratio information.
13. The apparatus according to claim 11 , wherein the processor is further configured to demodulate received downlink data according to the determined downlink data transmit power; and
the apparatus further comprises a transmitter, configured to feedback, to the base station, information indicating whether demodulation succeeds.
14. The apparatus according to claim 9 , wherein the receiver is further configured to receive a first field, wherein the first field comprises at least one of indication information of a demodulation reference signal DMRS port of a paired terminal of the terminal and indication information of a modulation scheme of a paired terminal of the terminal.
15. A non-transitory computer-readable medium comprising instructions that, when executed, cause an apparatus in a multiuser superposition transmission (MUST) system to implement the following steps:
receiving, by a terminal, information that indicates a terminal type corresponding to a transmission mode from a base station, wherein the transmission mode is a transmission mode that is used to send data to the terminal in a current scheduling period, and is one of a paired transmission mode or a non-paired transmission mode;
receiving, by the terminal, a power parameter that is used to determine downlink data transmit power, from the base station, wherein the power parameter comprises PA MUST and P A , and PA MUST is a power parameter in the MUST system; and
determining, by the terminal according to the information, a transmission mode used by the terminal wherein the terminal determines the transmission mode is a paired transmission mode, according to the PA MUST downlink data transmit power and P A is a power parameter defined in an existing protocol.
16. The medium according to claim 15 , wherein the apparatus is further caused to implement:
obtaining, by the terminal, downlink data transmit power ratio information, wherein the downlink data transmit power ratio information is a downlink data transmit power ratio of the terminal in the paired transmission mode.
17. The medium according to claim 16 , wherein the apparatus is further caused to implement:
receiving, by the terminal, the downlink data transmit power ratio information from the base station or indication information of the downlink data transmit power ratio information; and
obtaining, by the terminal, the downlink data transmit power ratio information according to the received downlink data transmit power ratio information or the received indication information of the downlink data transmit power ratio information.