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研究生:黃韋睿
研究生(外文):Wei-Jui Huang
論文名稱:GSM簡訊傳送之相關研究:簡訊重傳機制、控制頻道的分配以及有門檻條件的佇列系統分析
論文名稱(外文):Studies on the GSM short message transmission : retry scheme, control channel assignment, and system performance with thresholds on the short message wait-up queue
指導教授:李端興李端興引用關係
指導教授(外文):Duan-Shin Lee
學位類別:碩士
校院名稱:國立清華大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:29
中文關鍵詞:簡訊重傳機制有門檻條件的佇列
外文關鍵詞:short messageretry schemepolicy iterationqueue with thresholds
相關次數:
  • 被引用被引用:0
  • 點閱點閱:350
  • 評分評分:
  • 下載下載:51
  • 收藏至我的研究室書目清單書目收藏:1
行動簡訊(Short Message Service,SMS)在無限通訊的領域裡一直是個熱門的議題,越來越多的相關應用也被開發出來,例如:純文字訊息的傳送、語音留言的通知等等。然而,截至目前為止,卻很少有研究是著重於簡訊的重傳機制。這一篇論文的重點就是著重於簡訊傳送的相關研究,主體主要分為三個部分。首先在第個一部份,我們提出一個最佳化的簡訊重傳機制。這個機制的作法是去選取最佳的重傳時間點讓簡訊依照這時間排程進行重傳的動作,如此一來,便可以積極的增進重送成功的機率。儘管如此,這個作法卻沒有將建立語音通話服務時所要傳送的信息納入考量,故可能會使語音通話服務的中斷率提高。因此,在第二個部分的研究,我們使用了馬可夫決策程序(Markov Decision Process,MDP)裡的反覆政策演算法(Policy Iteration algorithm)去試圖找出一個關於控制頻道(Control Channel)的均衡分配。這個作法藉由均衡的分配控制頻道,讓簡訊以及語音通話能夠很公平的去使用通訊頻道。在這篇論文的最後一個部分,我們更進一步的去研究在門檻條件(threshold-based)下的簡訊傳送效能。希望可以用數學的分析去取代在計算上相當耗時的馬可夫決策程序裡的反覆政策演算法,以更有效率的方式去找出到底該如何公平的分配控制頻道。

Short Message Service (SMS) has become a popular issue in wireless systems. More and more applications based on SMS have been developed, including text messages, voice-mail notification, etc. However, very few studies have so far been made on the retry scheme of short message. In this paper, we first propose an optimization scheme on the short message retransmission. This scheme chooses optimized time instances to retransmit short messages, which increases the probability of successful transmission. Though, it does not consider the voice call setup messages, which may cause the voice call blocking probability to raise. Thus, in the second work, we manage to find a balance assignment of the control channel, by the MDP policy iteration algorithm. This scheme takes the voice call setup requests into consideration and it calculates the optimal assignment of the control channel, which can guarantee the short message and voice call both access the control channel fairly. Finally, we study the performance of the short message retransmission with threshold-based scheduling policies, in order to estimate the optimal assignment of the control channel without using the time-consuming MDP policy iteration algorithm.

1 Introduction
2 Retry Scheme Of Short Message Transmission
2.1 Introduction
2.2 Reward-Optimized Retry Scheme
2.3 Numerical Results and Simulation Results
3 Optimal Decision Rules From Policy Iteration
3.1 Introduction And Motivation
3.2 Policy Iteration
3.3 Numerical Results
4 Numerical Analysis Of The System Performance With Thresholds On The Short Message Wait-up Queue
4.1 Introduction And Motivation
4.2 Discrete-time M/D/K Queues With Thresholds
5 Conclusion

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