Communication device and communication method

1 . A communication device that performs wireless communication using a plurality of links each of which is an independent frequency resource of a plurality of independent frequency resources usable by the communication device for performing the wireless communication, the communication device comprising:

first transmission processing circuitry configured to transmit, on a first link of the plurality of links that is a first one of the plurality of independent frequency resources, a first signal including information regarding a start of an observation of a channel state performed across the plurality of links, the information regarding the start of the observation of the channel state performed across the plurality of links including a sounding identifier and a succeeding link field identifying a second link of the plurality of links that is a second one of the plurality of independent frequency resources, the second link being different from the first link; and

second transmission processing circuitry configured to transmit, on the second link of the plurality of links, a second signal inducing a signal including information regarding the observation of the channel state in one or more links among the plurality of links.

2 . The communication device according to claim 1 , wherein the first signal includes information regarding a link of the plurality of links for performing the observation.

3 . The communication device according to claim 1 , wherein the first signal includes information regarding a third signal for another communication device to observe the channel state.

4 . The communication device according to claim 3 , wherein the third signal is simultaneously transmitted on two or more links of the plurality of links.

5 . The communication device according to claim 3 , wherein the third signal is transmitted on two or more links of the plurality of links at different timings.

6 . The communication device according to claim 1 , wherein the second signal is a signal that induces a fourth signal for the communication device itself to observe the channel state.

7 . The communication device according to claim 6 , wherein resource allocation for multi-user communication is determined on a basis of information regarding the channel state observed by the communication device itself from the fourth signal transmitted from another communication device in response to the second signal.

8 . The communication device according to claim 1 , wherein the second signal is a signal that induces a fifth signal including information regarding the channel state observed by another communication device.

9 . The communication device according to claim 8 , wherein resource allocation of multi-user communication is determined on a basis of the information regarding the channel state collected from the fifth signal transmitted by the another communication device in response to the second signal.

10 . The communication device according to claim 7 , wherein the another communication device is requested to change a link of the plurality of links for transmission and reception on a basis of the information regarding the channel state.

11 . The communication device according to claim 7 , wherein the another communication device is requested to change a link of the plurality of links for performing reception processing of a signal addressed to broadcast on a basis of the information regarding the channel state.

12 . A communication method for performing wireless communication using a plurality of links each of which is an independent frequency resource of a plurality of independent frequency resources usable for performing the wireless communication, the communication method comprising:

transmitting, on a first link of the plurality of links, a first signal including information regarding a start of an observation of a channel state performed across the plurality of links, the information regarding the start of the observation of the channel state performed across the plurality of links including a sounding identifier and a succeeding link field identifying a second link of the plurality of links that is a second one of the plurality of independent frequency resources, the second link being different from the first link; and

transmitting, on the second link of the plurality of links, a second signal inducing a signal including information regarding the observation of the channel state in one or more links among the plurality of links.

13 . A communication device that performs wireless communication using a plurality of links each of which is an independent frequency resource of a plurality of independent frequency resources usable by the communication device for performing the wireless communication, the communication device comprising:

first reception processing circuitry configured to receive, on a first link of the plurality of links that is a first one of the plurality of independent frequency resources, a first signal including information regarding a start of an observation of a channel state performed across the plurality of links, the information regarding the start of the observation of the channel state performed across the plurality of links including a sounding identifier and a succeeding link field identifying a second link of the plurality of links that is a second one of the plurality of independent frequency resources, the second link being different from the first link,

second reception processing circuitry configured to receive, on the second link of the plurality of links, a second signal inducing a signal including information regarding the observation of the channel state in one or more links among the plurality of links, and

transmission processing circuitry configured to transmit, in response to receiving the first signal and the second signal, the signal including the information regarding the observation of the channel state in the one or more links among the plurality of links.

14 . The communication device according to claim 13 , wherein the signal including the information regarding the observation of the channel state is a fourth signal for another communication device to observe the channel state.

15 . The communication device according to claim 13 , wherein the signal including the information regarding the observation of the channel state is a fifth signal including information regarding the channel state observed by the communication device itself.

16 . The communication device according to claim 13 , wherein the signal including the information regarding the observation of the channel state includes information of a transmission power of the signal.

17 . The communication device according to claim 13 , wherein a link of the plurality of links for performing transmission and reception is changed on a basis of a request from a transmission source of the first signal or information included in the first signal.

18 . The communication device according to claim 13 , wherein a link of the plurality of links for performing reception processing of a signal addressed to broadcast is changed on a basis of a request from a transmission source of the first signal or information included in the first signal.

19 . A communication method for performing wireless communication using a plurality of links each of which is an independent frequency resource of a plurality of independent frequency resources usable for performing the wireless communication, the communication method comprising:

receiving, on a first link of the plurality of links that is a first one of the plurality of independent frequency resources, a first signal including information regarding a start of an observation of a channel state performed across the plurality of links, the information regarding the start of the observation of the channel state performed across the plurality of links including a sounding identifier and a succeeding link field identifying a second link of the plurality of links that is a second one of the plurality of independent frequency resources, the second link being different from the first link,

receiving, on the second link of the plurality of links, a second signal inducing a signal including information regarding the observation of the channel state in one or more links among the plurality of links, and transmitting, in response to receiving the first signal and the second signal, the signal including information regarding the observation of the channel state in the one or more links among the plurality of links.