Ethernet の補完を考慮した carrier sensing 型 SSMA protocol の提案  [in Japanese] A proposal of a carrier sensing SSMA protocol working complementarily to Ethernet  [in Japanese]

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Ethernetは、現在広く用いられているローカルエリアネットワークの一つであり, Carrier Sense Multiple Access with Collision Detection (CSMA/CD) 方式に基づいている。しかし, この方式は輻輳時には著しくスループットや遅延特性が劣化するという問題がある. 本稿では、この問題の解決としてCarrier Sense Spread Spectrum with Overload Detection (CSSS/OD) 方式を検討する。スペクトル拡散による多元接続方式 (SSMA) は、特に移動体通信の分野でその良好な周波数利用効率のため注目されているが、本稿ではSSMAのコンピュータ通信への適用の可能性について検討を行う. 従来方式として、non-persistent CSMA/CD方式を取り上げ、両者の性能を比較した結果、低トラヒック時は、スループットや遅延特性が優れているCSMA/CD方式を使用し,高トラヒック時にはCSSS/OD方式に切替える方式が有効であることを示している.

Ethernet is based on the CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol. Although it is widely used in local area networks, this protocol has a problem, such that the throughput and packet delay performances degrade rapidly when the offered loads of packets become high. As a solution to the problem, we propose the CSSS/OD (Carrier Sense Spread Spectrum with Overload Detection) protocol which works complementarily to CSMA/CD protocol. Although SSMA (Spread Spectrum Multiple Access) is often applied in wireless network environments due to its superior frequency utilization, we study here the possibility of applying the SSMA to wired computer network environments. We adopted the non-persistent CSMA/CD protocol as the conventional protocol, and compared both protocols' performances. As the result, we conclude to propose a hybrid accessing protocol, that is, the CSMA/CD protocol is used during the offered loads of packets being low, but the protocol is switched to CSSS/OD protocol during the offered loads being high.


  • IEICE technical report. Information theory

    IEICE technical report. Information theory 97(208), 49-54, 1997-07-25

    The Institute of Electronics, Information and Communication Engineers

References:  10

Cited by:  4


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    CJP  CJPref  NII-ELS 
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