Radio communication system, radio communication device, and radio communication method
View Patent ↗This communication system comprises: a first radio-communication device that transmits a plurality of first reference signals with controlled directivity in a time-sharing manner in a first period; and a second radio-communication device that transmits a plurality of second reference signals with controlled directivity to the first radio-communication device in a time-sharing manner in a second period, the second reference signal including information on directivity corresponding to any one of the first reference signals received from the first radio-communication device.
1 . A radio communication apparatus communicating with a first transmitter/receiver point (TRP) and a second TRP, the radio communication apparatus comprising:
circuitry, which, in operation, controls external communication of the radio communication apparatus with the first and second TRPs and selects a selected beam among a plurality of beams used by the first TRP, wherein the radio communication apparatus, first TRP and second TRP are different devices; and
a transmitter, which, in operation, transmits, to the first TRP, information relating to the selected beam, information on whether or not a transmission with the first TRP and the second TRP is performed, and other information relating to another beam of the second TRP together in a Random Access Channel (RACH) or a Physical Uplink Shared Channel (PUSCH).
2 . The radio communication apparatus according to claim 1 , wherein information relating to the plurality of beams is transmitted from the second TRP.
3 . The radio communication apparatus according to claim 1 , wherein the selected beam is determined based on reference signals transmitted from the first TRP.
4 . The radio communication apparatus according to claim 1 , wherein the information relating to the selected beam is transmitted in a case where a communication with the first TRP is failed.
5 . The radio communication apparatus according to claim 1 , wherein the information relating to the selected beam is transmitted by using a Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing (DFT-S OFDM).
6 . A radio communication method for communicating with a first transmitter/receiver point (TRP) and a second TRP, comprising:
controlling, by a communication apparatus, external communication with the first and second TRPs, wherein the communication apparatus, first TRP and second TRP are different devices;
selecting, by the communication apparatus, a selected beam among a plurality of beams used by the first TRP; and
transmitting, by the communication apparatus to the first TRP, information relating to the selected beam, information on whether or not a transmission with the first TRP and the second TRP is performed, and other information relating to another beam of the second TRP together in a Random Access Channel (RACH) or a Physical Uplink Shared Channel (PUSCH).
7 . The radio communication method according to claim 6 , wherein information relating to the plurality of beams is transmitted from the second TRP.
8 . The radio communication method according to claim 6 , wherein the selected beam is determined based on reference signals transmitted from the first TRP.
9 . The radio communication method according to claim 6 , wherein the information relating to the selected beam is transmitted in a case where a communication with the first TRP is failed.
10 . The radio communication method according to claim 6 , wherein the information relating to the selected beam is transmitted by using a Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing (DFT-S OFDM).