Wireless communication device, transmission terminal, and wireless communication system
A wireless communication device includes a wireless communicator configured to perform wireless communication with a plurality of transmission terminals, and processor circuitry is further configured to determine whether a conflict occurs in wireless resources reserved by the transmission terminals to be used for data transmission, and determine, when it is determined that a conflict of the wireless resources occurs, for transmitting information that indicates the conflict of the wireless resources.
1 . A wireless communication device comprising:
a wireless communicator configured to perform wireless communication with a plurality of transmission terminals; and
processor circuitry is further configured to:
determine whether a conflict occurs in wireless resources reserved by the transmission terminals to be used for data transmission,
determine, when it is determined that a conflict of the wireless resources occurs, for transmitting information for requesting a reselection of the wireless resource,
determine, out of the plurality of the transmission terminals, a first transmission terminal for transmitting the information, and
determine, out of the plurality of the transmission terminals, a second transmission terminal for not transmitting the information,
wherein the first transmission terminal is determined based on rules established according to a priority of data transmitted using the reserved wireless resource, a reception timing of control information notifying the reserved wireless resource and an occupied area of the reserved wireless resource.
2 . The wireless communication device according to claim 1 , wherein the processor circuitry is further configured to:
calculate an error risk that indicates a possibility of having an error in data, when data is transmitted by using conflicting wireless resources, and
when the calculated error risk is equal to or greater than a prescribed threshold, determine for transmitting the information for requesting the reselection of the wireless resource.
3 . The wireless communication device according to claim 2 , wherein the processor circuitry is further configured to calculate the error risk based on a proportion of an area overlapping with a wireless resource reserved by another transmission terminal occupying an occupied area of a wireless resource reserved by each of the transmission terminals.
4 . The wireless communication device according to claim 3 , wherein the processor circuitry is further configured to calculate the error risk based on Modulation and Coding Scheme (MCS) of the data transmitted by using the wireless resource reserved by each of the transmission terminals.
5 . The wireless communication device according to claim 1 , wherein the processor circuitry is further configured to cause the transmission terminal that received the information determined to be transmitted by the processor circuitry, to reselect the wireless resource according to the rule based on the priority of the data transmitted by using the reserved wireless resource, the reception timing of control information that notifies the reserved wireless resource, the occupied area of the reserved wireless resource, or a transmission period of the data transmitted by using the reserved wireless resource, or any combination thereof.
6 . The wireless communication device according to claim 1 , wherein the wireless communicator is further configured to transmit the information for requesting the reselection of the wireless resource by using a feedback channel that is for transmitting feedback information.
7 . The wireless communication device according to claim 1 , wherein the information for requesting the reselection of the wireless resource is information that cause a transmission terminal received the information to reselect the wireless resource.
8 . A transmission terminal in a plurality of transmission terminals communicating with wireless communication device, the transmission terminal comprising:
a transmitter configured to transmit, to the wireless communication device, information indicating a first wireless resource to reserve for use in data transmission;
a receiver configured to receive, from the wireless communication device, information for requesting a reselection of the wireless resource, when the wireless communication device detects a conflict of the first wireless resource and a second wireless resource reserved by the other transmission terminal in the plurality of transmission terminals, and determines a first transmission terminal for transmitting the information and a second transmission terminal for not transmitting the information based on rules established according to a priority of data transmitted using the reserved wireless resource, a reception timing of control information notifying the reserved wireless resource and an occupied area of the reserved wireless resource; and
processor circuitry configured to select a third wireless resource different from the first wireless resource according the reception of the information for requesting the reselection of the wireless resource.
9 . A wireless communication system comprising:
a first terminal device;
a second terminal device; and
a third terminal device, wherein
the first terminal device and the second terminal device include a transmitter configured to transmit control information for specifying a wireless resource reserved to be used for data transmission,
the third terminal device includes,
a wireless communicator configured to perform wireless communication with the first terminal device and the second terminal device, and
processor circuitry configured to:
determine whether a conflict occurs in the wireless resources reserved by the first terminal device and the second terminal device, based on the control information received by the wireless communicator,
determine, when it is determined that a conflict of the wireless resources occurs, for transmitting information for requesting a reselection of the wireless resource,
determine, out of the first transmission terminal and the second transmission terminal, the first transmission terminal for transmitting the information, and
determine, out of the first transmission terminal and the second transmission terminal, the second transmission terminal for not transmitting the information,
wherein the first transmission terminal is determined based on rules established according to a priority of data transmitted using the reserved wireless resource, a reception timing of control information notifying the reserved wireless resource and an occupied area of the reserved wireless resource.