長期演進（Long Term Evolution；LTE）系統定義兩種工作方式：分頻多工(Frequency Division Duplexing；FDD) 和分時多工(Time Division Duplexing；TDD)。在分時多工系統的移動通信系統中，接收和發送使用相同頻率載波，而在時間上進行資源的分配。某個時段進行下行傳輸，另外的時段則進行上行傳輸，基地站(eNodeB；eNB)和使用者(User Equipment；UE)之間必須同步才能順利工作。
LTE分時多工系統中規範7種上下行時槽配置可供使用，但並未說明可以如何有效率的使用這7種配置。且LTE中存在著細胞間干擾（Inter-cell Interference；ICI），尤其在分時多工系統中更必須注意訊框交錯干擾（Crossed Timeslot Interference；CTI)的存在。訊框交錯干擾是由於兩個相鄰的分時多工系統使用不同的上下行時槽配置，在部分的子訊框會出現『一個系統在進行下行傳輸，另一系統在進上行傳輸』的干擾時，兩者的無線訊號彼此相互影響，造成傳輸資料速率下降的現象。
為解決上述問題，本論文提出『動態調整上下行時槽比例配置』方法，考量有中繼站(Relay Station；RS)的環境中，彈性使用規範中的上下行時槽比例配置來提高系統的傳輸產能，並針對CTI影響進行分析比較。由模擬結果可知，本論文提出的機制可得到更好的傳輸產能並解決現有分時多工系統不能靈活配置上下行時槽比例的情況，對於無線資源能更有效率的使用。

In the Long Term Evolution (LTE) system，there are two different duplexing modes: Frequency Division Duplexing(FDD) and Time Division Duplexing(TDD). TDD use time to separate the transmitting channel and receiving channel.In the mobile system with TDD mode,the frequency carrier of receiving and transmitting signal is same and allocates the resources by time. The eNB sends signal to UE in particular time,the UE sends signal to eNB in the other time. Therefore,the UE and eNB have to be synchronous to perform smoothly.
In 3GPP specification,3GPP group defined seven different DL/UL configuration schemes in TDD frame. But do not explain how we can efficiently using those configurations.In LTE system, we need considered inter-cell interference. Crossed timeslot interference is a special inter-cell interference in LTE TDD system. When two neighbor cells use different DL/UL configuration schemes, crossed timeslot interference may occur.
In order to solve the above problems, we propose a flexible adjustment of DL/UL configuration schemes. Considering Relay deploying environment,using this schemes to improve the system throughput and comparing impact of the CTI with system throughput at the same time.

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