Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE
碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === In the LTE system, the bandwidth will be divided by the time and frequency into many resource blocks, then user can use these different resource blocks to transmit data. Thus LTE can avoid most intra cell interference. However, due to the cell doesn’t know what...
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ndltd-TW-101NTUS54421022016-03-21T04:28:03Z http://ndltd.ncl.edu.tw/handle/46058093939273235301 Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE 基於動態部分頻率重複使用機制之LTE細胞間干擾減少之研究 Chien-Shiuan Chen 陳建瑄 碩士 國立臺灣科技大學 電機工程系 101 In the LTE system, the bandwidth will be divided by the time and frequency into many resource blocks, then user can use these different resource blocks to transmit data. Thus LTE can avoid most intra cell interference. However, due to the cell doesn’t know what the situation of resource allocation by other neighboring cell, they will make interference to each other easily, called inter cell interference. In this situation, the user who is on the cell edge will suffer more interference. Thus, there are many papers proposed to solve the inter cell interference (ICI) problem, such as: FFR (Fractional Frequency Reuse) and SFR (Soft Frequency Reuse). Although these methods can avoid interference to nearby cell through restricting the available frequency resources in their own cell’s sectors, the available resources will be reduced. In addition, when network topology have changed, these methods doesn’t adjust their frequency resources of each sector, as a result, the overall throughput will be reduced. There are some researches proposed dynamic FFR and dynamic SFR to solve aforementioned problems. Although the dynamic adjustment method can enhance the overall throughput, avoiding ICI must be considered. That is, we have to adjust neighbor cell’s frequency at the same time, this will need much of the time to exchange data or massive calculation. So we propose a simple and fast algorithm to dynamically adjust frequency resources which don’t need to adjust neighbor cell’s frequency at the same time but still can avoid ICI. Bih-Hwang Lee 黎碧煌 2013 學位論文 ; thesis 79 zh-TW |
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碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === In the LTE system, the bandwidth will be divided by the time and frequency into many resource blocks, then user can use these different resource blocks to transmit data. Thus LTE can avoid most intra cell interference. However, due to the cell doesn’t know what the situation of resource allocation by other neighboring cell, they will make interference to each other easily, called inter cell interference. In this situation, the user who is on the cell edge will suffer more interference. Thus, there are many papers proposed to solve the inter cell interference (ICI) problem, such as: FFR (Fractional Frequency Reuse) and SFR (Soft Frequency Reuse).
Although these methods can avoid interference to nearby cell through restricting the available frequency resources in their own cell’s sectors, the available resources will be reduced. In addition, when network topology have changed, these methods doesn’t adjust their frequency resources of each sector, as a result, the overall throughput will be reduced. There are some researches proposed dynamic FFR and dynamic SFR to solve aforementioned problems.
Although the dynamic adjustment method can enhance the overall throughput, avoiding ICI must be considered. That is, we have to adjust neighbor cell’s frequency at the same time, this will need much of the time to exchange data or massive calculation.
So we propose a simple and fast algorithm to dynamically adjust frequency resources which don’t need to adjust neighbor cell’s frequency at the same time but still can avoid ICI.
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Bih-Hwang Lee |
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Bih-Hwang Lee Chien-Shiuan Chen 陳建瑄 |
author |
Chien-Shiuan Chen 陳建瑄 |
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Chien-Shiuan Chen 陳建瑄 Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
author_sort |
Chien-Shiuan Chen |
title |
Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
title_short |
Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
title_full |
Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
title_fullStr |
Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
title_full_unstemmed |
Reducing inter-cell interference base on Dynamic Fractional Frequency Reuse (FFR) Mechanism in LTE |
title_sort |
reducing inter-cell interference base on dynamic fractional frequency reuse (ffr) mechanism in lte |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/46058093939273235301 |
work_keys_str_mv |
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