Radio communication method, radio communication system, and mobile station
First Claim
1. A radio communication method, which uses a first mobile station that transmits and receives a radio signal and a second mobile station that performs direct communication for transmitting and receiving a radio signal to and from the first mobile station without passing through a base station, comprising:
- a step of generating and transmitting, by the first mobile station, a synchronization-use signal to be used for establishment of initial access with the second mobile station toward the second mobile station on the basis of identification information received from the base station to which the first mobile station is connected;
a step of receiving, by the second mobile station, the synchronization-use signal; and
a step of generating and transmitting, by the second mobile station, a response signal when identification information received from the base station coincides with identification information obtained from the synchronization-use signal received from the first mobile station,wherein the identification information received from the base station includes information identifying the synchronization-use signal.
1 Assignment
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Accused Products
Abstract
Provided are a radio communication method, a radio communication system, and a mobile station, by which it is possible to easily establish initial access between mobile stations in D2D communication. A mobile station 200A transmits a synchronization-use signal to be used for establishment of initial access with a mobile station 200B toward the mobile station 200B on the basis of control information received from a cell to which the mobile station 200A is connected. The mobile station 200B receives the synchronization-use signal on the basis of the control information received from the cell. Moreover, the mobile station 200B determines transmission power and a transmission timing of a response signal on the basis of the received synchronization-use signal, and transmits the response signal toward the mobile station 200A. The mobile station 200A and the mobile station 200B start D2D communication on the basis of the synchronization-use signal and the response signal.
24 Citations
15 Claims
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1. A radio communication method, which uses a first mobile station that transmits and receives a radio signal and a second mobile station that performs direct communication for transmitting and receiving a radio signal to and from the first mobile station without passing through a base station, comprising:
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a step of generating and transmitting, by the first mobile station, a synchronization-use signal to be used for establishment of initial access with the second mobile station toward the second mobile station on the basis of identification information received from the base station to which the first mobile station is connected; a step of receiving, by the second mobile station, the synchronization-use signal; and a step of generating and transmitting, by the second mobile station, a response signal when identification information received from the base station coincides with identification information obtained from the synchronization-use signal received from the first mobile station, wherein the identification information received from the base station includes information identifying the synchronization-use signal. - View Dependent Claims (2)
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3. A radio communication system, comprising:
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a first mobile station that transmits and receives a radio signal and a second mobile station that performs direct communication for transmitting and receiving a radio signal to and from the first mobile station without passing through a base station, wherein the first mobile station comprises; a first receiver that receives identification information from the base station to which the first mobile station is connected; a first transmitter that transmits a synchronization-use signal to be used for establishment of initial access with the second mobile station toward the second mobile station on the basis of the identification information received by the first receiver, and the second mobile station comprises; a second receiver that receives the identification information from the base station; the second receiver receives the synchronization-use signal; and a second transmitter that transmits a response signal when the identification information received from the base station coincides with identification information obtained from the synchronization-use signal received from the first mobile station, wherein the identification information received from the base station includes information identifying the synchronization-use signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A mobile station, which performs direct communication for transmitting and receiving a radio signal to and from another mobile station without passing through a base station, comprising:
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a receiver that receives identification information from a base station; the receiver receives a synchronization-use signal to be used for establishment of initial access with the other mobile station; and a transmitter that transmits a response signal when the identification information received from the base station coincides with identification information obtained from the synchronization-use signal received from the other mobile station, wherein the identification information received from the base station includes information identifying the synchronization-use signal. - View Dependent Claims (15)
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Specification