[問題] 請問有人用NIST的802.16 Module嗎

看板Network_Sim作者Gg27094 ( )時間15年前 (2009/04/14 22:09)推噓1(1推 0噓 2→)

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有點問題想請教各位我裝了NIST的802.16 module for ns-2.31 現在想模擬wireless node1送cbr data到wireless node2 然後透過調整node的diuc來控制modulation (64QAM 3/4, 16QAM 1/2...etc) 但是有點問題當我把cbr data rate設低一點的時候(ex. 1mb) 64QAM跟16QAM的throughput都是1mb左右如果把cbr data rate設高的話( ex. 10mb) 那反而64QAM比16QAM的throughput還低大概是64QAM = 5mb/s, 16QAM = 7mb/s 若把frequency bandwidth調高則64QAM與16QAM的throughput同時上升但仍然是16QAM比64QAM的throughput高而64QAM的throughput較低由trace file中來看一直drop packet的原因為RTR QWI 官網的document說明為 - QWI: each connection has a queue to store pending frames. When the queue is full, thepacket is dropped using this reason code. 另外官網的FAQ中data rate的說明為 Q: How to set the datarate? A: Unlike the 802.11 implementation, the datarate is not something set in TCL. Since each burst can use a different modulation and therefore have different datarates, we opted for a dynamic calculation of the datarate. By setting the frequency bandwidth, cyclic prefix and the modulation, the datarate will change. Other parameters such as number of contention slots for initial ranging and bandwidth requests or the downlink/uplink ratio affect the maximum amount of data that can be transferred during a frame. 調滿多參數了還是無法讓64QAM比16QAM的throughput高請問是否還有哪裡需要設定呢感激不盡 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.136.179.102 ※ 編輯: Gg27094 來自: 220.136.179.102 (04/14 22:19)