System for controlling frame collision
AssigneeFujitsu Limited
InventorYoshiyuki Fukuhara
Life of this patent
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Abstract
A system for controlling frame collision, enabling retry of transmission earlier and transmission of a data frame from the base station earlier, in a wireless LAN constituted by a base station connected to a cable LAN and a plurality of terminals for performing radio communication with the base station, where the terminal is provided with an adding means for adding a frame start code and a length to a tail of the data frame to be transmitted from the terminal to the base station and where the base station is provided with a collision detection means for recognizing the occurrence of collision when the frame start code and length remain without being destroyed in any of the data frames arriving simultaneously from a plurality of terminals.
Claims20
A system for controlling frame collision of data frames in a wireless network constituted by a base station connected to a cable network and a plurality of terminals for performing radio communication of data frames with the base station, with each data frame comprising first and second subframes, the system comprising:
- a plurality of terminals, each provided with an adding unit adding the second subframe, comprising a frame start code and length, to a tail of the first subframe, and transmitting the first and second subframes from each terminal to the base station;
- and
- a base station provided with a collision detection unit recognizing the occurrence of a collision by detecting that only the second subframe remains, without being destroyed, in any data frames transmitted from the plurality of terminals and a collision occurs therebetween,
- wherein the base station transmits a collision notifying frame addressed to a corresponding terminal when the collision detection unit detects the collision of data frames.
A system for controlling frame collision in a wireless network constituted by a base station connected to a cable network and a plurality of terminals for performing radio communication of data frames with the base station, with each data frame comprising first and second subframes, each of the base station and the plurality of terminals comprising:
- an adding unit adding the second subframe, comprising a frame start code and a length, both for recognizing an occurrence of collision, to the tail of the first subframe when data frames are transmitted from a terminal to the base station or from the base station to a terminal;
- and
- a collision detection unit located at the base station or one of the terminals, the collision detection unit recognizing an occurrence of a collision by detecting that only the second subframe remains in any received data frames, without being destroyed, when data frames are simultaneously transmitted between the base station and terminals and the collision occurs.
A communication equipment for performing communication of data frames between at least two equipment, with each data frame comprising first and second subframes, with one communication equipment comprising:
- an adding unit adding the second subframe to a tail of the first subframe to be transmitted to other communication equipment;
- and
- a transmission unit transmitting said first subframe added with said second subframe to said other communication equipment, so that said other communication equipment detects a collision by detecting that only the second subframe remains, without being destroyed, during a collision.
Communication equipment for performing communication of data frames between at least two equipment, with each data frame comprising first and second subframes, comprising:
- a reception unit receiving the second subframe added to the first subframe, transmitted by another communication equipment;
- and
- a collision detection unit recognizing that a collision occurs by detecting that only the second subframe remains, without being destroyed, in any received data frame even if the received data frame collides with another data frame.
Dependencies are inferred from the claim text.