在第四代行動通訊混合式基地台網路下之 多點協調資源區塊分配與系統效能分析

CoMP應用場景三在資料處理與後端網路連結不同於一般混合式網路中大小基地台皆要負責。與大基地台以高傳輸速率光纖連結的RRH只負責傳送資料，其他都由高功率基地台的資料處理單元與後端網路處理。然而混合式大小基地台網路中的大基地台負載常過重，因此將小型基地台的服務範圍延伸，為大基地台卸載一些流量。但如此一來基地台的數量增加也同時增加了基地台之間使用相同資源區塊所造成同頻干擾的可能性。同頻干擾會影響使用者的訊號品質、降低使用者的傳輸資料的速率、也減少系統的吞吐量。因此如何分配頻帶與有效的管理干擾便為一大議題。本論文將探討在LTE-A中CoMP應用場景三中，使用不同基地台服務範圍延伸與不同資源區塊分配策略並佐以動態流量負載的方式來分析系統大基地台與RRH中使用者訊號品質與傳輸完成的情況。最後藉由模擬數據分析得出在大幅度的基地台服務範圍延伸方法可以讓本文提出的動態資源分配方法充分的發揮效用使得阻塞率比其他方式佳，以及頻譜效率也多了50%，改善了基地台邊界使用者的訊號品質、使基地台邊界傳輸成功的使用者數量大增。

關鍵字

基地台服務範圍延伸；協調排程；混合式網路；資源分配；流量卸載

並列摘要

CoMP Scenario 3 is different from the eNB and HeNB in the conventional hybrid network. Rather than connect each eNB with air-interface X2, gigabit optical fibers is adopted in CoMP Scenario 3. In addition, CoMP Scenario 3 use RRH as HeNB. RRH is only equipped with a transceiver which converts RF to and from digital IF signals. BBU in eNB process radio resource and network management functionalities. However, the more base stations deployed in hybrid network, the greater the Co-Channel Interference would be. Co-Channel Interference would not only lower UE’s SINR, transmitted data rate and system throughput but also increase the blocking Probability. Therefore, allocate RBs efficiently as to manage Co-Channel Interference would be a big challenge. This thesis proposes cell range expansion and resource allocation with dynamic traffic in LTE-A CoMP scenario 3. With simulation results show that if cell range expansion bias value is greater enough, the dynamic resource allocation would be 50% better than statistic resource allocation in spectral efficiency and the dynamic resource allocation performs better than other strategies under 80Mbps without cell range expansion. In summary, the signal quality of cell edge user would be improved and the total number of successfully served users also increased by our dynamic resource allocation.

並列關鍵字

Cell Range Expansion ； Coordinated Scheduling ； CoMP ； Hybrid Network ； Resource Allocation ； Offloading

參考文獻

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國際替代計量

在第四代行動通訊混合式基地台網路下之多點協調資源區塊分配與系統效能分析

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