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多元接続 .
多元接続 (たげんせつぞく : Multiple Access)は、 複数の無線局 が、電波 帯域を共有して情報を送ることである。
電波帯域の有効活用のため、組み合わせて使用されることが多い。
多元接続 (FDMA、TDMA、CDMA) 分割されたチャネルの割り当て方式には、つぎの2つがある。
要求時割り当て方式 (Demand Assignment) : 要求のあった無線局に割り当て。
事前割り当て方式 (Pre-Assignment) : 事前に無線局ごとに割り当て。 また、搬送波当たりのチャネル割り当て方法もある。
Single Channel Per Carrier : 搬送波1つに1つのチャネル。
Multi Channel Per Carrier : 搬送波1つに複数のチャネル。
Multi Carrier modulation : 複数の搬送波で1つのチャネルを構成する変調方式 。
チャンネルベース
FDMA TDMA
マルチ周波数時分割多元接続(英語版 ) (MF-TDMA)
Self-Organized Time Division Multiple Access(英語版 ) (STDMA)
CDMA SDMA PDMA PAMA
パケットベース
衝突回復 衝突防止
Multiple Access with Collision Avoidance(英語版 ) (MACA)
Multiple Access with Collision Avoidance for Wireless(英語版 ) (MACAW)
Carrier sense multiple access(英語版 ) (CSMA)
CSMA/CD
CSMA/CA
Distributed coordination function(英語版 ) (DCF)
Point coordination function(英語版 ) (PCF)
IEEE 802.11e-2005(英語版 ) (HCF)
CSMA/CARP
無衝突 Delay & disruption tolerant
MANET
Vehicular ad hoc network(英語版 ) (VANET)
DTN
Dynamic Source Routing(英語版 )
複信
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