一種IEEE 802.16中快速有效的沖突解決算法
A Fast Efficient Collision Resolution Algorithm in IEEE 802.16
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摘要: IEEE 802.16寬帶無線接入系統(tǒng)在其上行媒體接入控制層采用時，分復(fù)用和資源競爭與預(yù)留的方式進(jìn)行接入，各用戶站(SS)之間存在著競爭與沖突，這將導(dǎo)致系統(tǒng)性能下降。該文針對SS在碰撞以后的沖突解決過程提出了一種快速有效的沖突解決算法動態(tài)退避控制(Dynamical Backoff Control，DBC)算法。在該算法中，基站(BS)通過預(yù)測下一個上行幀中將會出現(xiàn)的帶寬請求報文數(shù)，動態(tài)地控制SS的退避范圍，以增大每幀中成功發(fā)送的帶寬請求報文數(shù)，從而提高M(jìn)AC層的數(shù)據(jù)吞吐，降低SS的平均接入延遲。利用OPNET對DBC和二進(jìn)制指數(shù)退避兩種算法進(jìn)行了仿真。仿真結(jié)果顯示DBC算法對系統(tǒng)性能有一定的改善和提高。
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關(guān)鍵詞:
- IEEE 802.16; 寬帶無線接入; 退避; 沖突解決
Abstract: IEEE 802.16 broadband wireless access system adopts TDMA (Time-Division Multiple Access) and contention-based reservation of resource in its uplink MAC layer. Thus there are contentions and collisions between SSs(Subscriber Stations), and the performance is inevitably deteriorated. A fast and efficient backoff algorithm DBC (Dynamical Backoff Control) is proposed to solve the problem. In DBC, by predicting the number of request messages in next uplink frame, BS controls the optimal backoff ranges dynamically. As a result, the successful rate of sending request messages in each frame is increased, the data throughput of MAC layer is promoted, and the mean access delay of SS is reduced. Simulation is conducted in OPNET to compare DBC with binary exponential backoff. Simulation results demonstrate that proposed DBC algorithm makes a great improvement in system performance. -
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