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AssigneeHitachi, Ltd.
InventorsYoshihiro Takiyasu, Eiichi Amada, Hidehiko Jusa, Tomoaki Ishifuji, Shuichi Adachi, Genichi Ishii
Estimating the term…
In a communication system having a base station for controlling a transmission right and a plurality of substations, a substation having data to be transmitted transmits the number of necessary fragments and its address to a request field of a communication frame. The base station uses a plurality pair of fragment slots and reply slots following the request field in the communication frame to transmit an address of a substation permitted to transmit data, to each fragment slot. The substation permitted to transmit data transmits the address of a destination substation and the data to a predetermined field following the address in one fragment slot. The destination station transmits a reply signal indicating the reception state of the data to the reply slot paired with the fragment slot. If the base station detects from the reply signal that the destination station failed in receiving the data, the base station instead of the substation first transmitted the data transmits the destination address and data received at the fragment slot to the next fragment slot.
A communication method for communicating among a base station and a plurality of substations using a communication frame including a frame synchronization field, a request field following the frame synchronization field, and an information field following the request field, the information field including an access permission area and a data area following the access permission area, the communication method comprising the steps of:
A communication method for communicating among a base station and a plurality of substations using a communication frame including a frame synchronization field, a request field following the frame synchronization field, and an information field following the request field, the information field including a plurality of transmission slots and a plurality of reply slots, each of the reply slots being paired with a respective one of the transmission slots, the communication method comprising the steps of:
A substation in a communication system, the substation being any one of a plurality of substations in the communication system, the substations having mutually different addresses, the communication system including a base station, the base station and the substations communicating with one another using a communication frame, the communication frame including a frame synchronization field, a request field, and an information field, the information field including a plurality of transmission slots, each of the transmission slots including an access permission area and a data area, the base station including
A substation in a communication system, the substation being any one of a plurality of substations in the communication system, the substations having mutually different addresses, the communication system including a base station, the base station and the substations communicating with one another using a communication frame, the communication frame including a frame synchronization field, a request field, and an information field, the information field including a plurality of transmission slots, each of the transmission slots including an access permission area and a data area, the base station including
A substation in a communication system, the substation being any one of a plurality of substations in the communication system, the substations having mutually different addresses, the communication system including a base station, the base station and the substations communicating with one another using a communication frame, the communication frame including a frame synchronization field, a request field, and an information field, the information field including a plurality of transmission slots, each of the transmission slots including an access permission area and a data area, the base station including
A substation in a communication system, the substation being any one of a plurality of substations in the communication system, the substations having mutually different addresses, the communication system including a base station, the base station and the substations communicating with one another using a communication frame, the communication frame including a frame synchronization field, a request field, and an information field, the information field including a plurality of transmission slots, each of the transmission slots including an access permission area and a data area, the base station including
Dependencies are inferred from the claim text.