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    • 3. 发明授权
    • Data communication apparatus achieving efficient use of the media
    • 实现媒体有效利用的数据通信装置
    • US5592483A
    • 1997-01-07
    • US466358
    • 1995-06-06
    • Kaoru HiedaMasahiko TsukamotoAkira Imai
    • Kaoru HiedaMasahiko TsukamotoAkira Imai
    • H04L29/08H04L12/413
    • H04L12/413
    • When an apparatus C which shares the media with apparatuses A and B desires to transmit an RTS packet, apparatus C inhibits transmission of the RTS packet for a fixed waiting time Tm plus a transmission inhibition period which varies depending on a type of a packet in a sensed carrier. In other words, when apparatus C senses an RTS packet of apparatus A, apparatus C inhibits transmission for a packet transmission inhibition period 101 resulting from reception of RTS. When apparatus C senses a CTS packet of apparatus B, apparatus C inhibits transmission for a packet transmission inhibition period 102 resulting from reception of CTS. When apparatus C senses a data packet, apparatus C inhibits transmission for a packet transmission inhibition period 103 resulting from reception of a data packet. When apparatus C senses an ACK packet of apparatus B, apparatus C inhibits transmission for a packet transmission inhibition period 104 resulting from reception of an ACK. As a result, a data communication apparatus which achieves efficient communication between a plurality of data communication apparatuses which share the same media is provided.
    • 当与设备A和B共享媒体的设备C希望发送RTS分组时,设备C禁止在固定等待时间Tm加上传输抑制周期的RTS分组的传输,该传输禁止周期根据 感应载体。 换句话说,当装置C感测到装置A的RTS分组时,装置C禁止由于RTS的接收而导致的分组发送禁止期间101的发送。 当设备C感测设备B的CTS分组时,设备C禁止由于接收到CTS而产生的分组传输禁止时段102的传输。 当设备C感测到数据分组时,设备C禁止由于数据分组的接收而产生的分组传输禁止期间103的传输。 当设备C感测设备B的ACK分组时,设备C禁止由于接收到ACK而产生的分组传输禁止期间104的传输。 结果,提供了在共享相同介质的多个数据通信装置之间实现高效通信的数据通信装置。
    • 4. 发明授权
    • Communication apparatus automatically selecting one of two operation
modes
    • 通信设备自动选择两种操作模式之一
    • US5585952A
    • 1996-12-17
    • US471757
    • 1995-06-06
    • Akira ImaiYuji IchikawaKaoru HiedaMasahiko Tsukamoto
    • Akira ImaiYuji IchikawaKaoru HiedaMasahiko Tsukamoto
    • H04L27/04H04B10/11H04B10/114H04B10/524H04B10/54H04L29/06H04J14/08
    • H04L29/06H04L69/18H04L69/24
    • A communication apparatus includes a memory. The memory stores the protocol of an ASK system and the protocol of an IrDA system. These protocols require predetermined time periods of T1 and T2 prior to establishing a connection with a station of the other party. The memory further stores time periods of Ra, Rb, Sa, and Sb, where the relationship of (Ra+Rb).noteq.(Sa+Sb), Sa>T1, Sb>T2, Rb>T2 is established. The communication apparatus further includes a transmission circuit and a reception circuit for the ASK system, a transmission circuit and a reception circuit for the IrDA system, a timer, and a control circuit. The control circuit controls the transmission circuit, the reception circuit, and the timer while referring to the stored contents of the memory. The control circuit carries out a "handshaking" procedure with the station of the other party, alternately trying the ASK protocol and the IrDA protocol until it is determined which of the two protocols the two stations have in common, and setting a flag signal to select the fastest transmission protocol which the two stations have in common. The selected protocol is thereafter used for communication between the two stations.
    • 通信装置包括存储器。 存储器存储ASK系统的协议和IrDA系统的协议。 在与另一方的站建立连接之前,这些协议需要T1和T2的预定时间段。 存储器还存储着(Ra + Rb)NOTEQUAL(Sa + Sb),Sa> T1,Sb> T2,Rb> T2的关系的Ra,Rb,Sa和Sb的时间周期。 通信装置还包括用于ASK系统的发送电路和接收电路,用于IrDA系统的发送电路和接收电路,定时器和控制电路。 参考存储器的存储内容,控制电路控制发送电路,接收电路和定时器。 控制电路与另一方的电台进行“握手”过程,交替尝试ASK协议和IrDA协议,直到确定两个电台共同的两个协议中的哪一个,并设置一个标志信号来选择 这两个站是共同的最快的传输协议。 所选择的协议随后用于两个站之间的通信。