兩層式交錯雙工異質性行動網路之干擾管理控制

Interference Management in Two-Tier Heterogeneous Cellular Network with Reverse Duplex

劉士戎(SHI-RONG LIU)

指導教授 ： 王奕翔

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.01797

摘要

隨著智慧型手機普及，行動數據通訊的資料流量每年都以驚人
的倍數速度成長，人們對於無線通訊服務的需求量大增。因應暴
增的需求量，近期有研究機構提出異質性行動網路(heterogeneous
cellular network) 架構來協助未來無線通訊的發展，並且被廣為重視與
探討。而透過佈建多個的小型基地台(small cells)，能提供更良善的
行動通訊服務，這樣的網路架構稱為兩層式異質性行動網路(two-tier
heterogeneous cellular network)。其中小型基地台共用與大型基地台
(macro cell) 相同的專屬執照頻段，能提供更好的頻譜效率，這樣的技
術稱為頻譜共享(sharing spectrum)。
在本論文中，將會針對運用頻譜分享技術的兩層式交錯雙工異質網
路作探討。其中交錯雙工模式(reverse duplex mode) 指的是大型基地台
與小型基地台彼此之間是交錯傳輸資訊，例如: 當大型基地台傳輸下行
(downlink) 的資訊時，而相反地小型基地台則是傳輸上行(uplink) 的資
訊，反之亦然。另外無線通信系統中使用的時分雙工/頻分雙工(TDD/
FDD) 皆能採用交錯傳輸，而稱為交錯式時分雙工/頻分雙工(reverse
TDD/FDD)。根據消息理論(information theory) 分析，可將兩層式交錯
雙工異質網路架構視為干擾通道的模型。因此在本論文中主要提出一
項近似最佳化的干擾管理機制，其中干擾管理機制整合了交錯式模式
以及部分干擾消除策略(partial interference cancelling scheme) 或多層部
分干擾消除策略(multilevel partial interference cancelling scheme)，並且
透過此干擾管理機制，驗證了在單邊干擾、一對多干擾以及多输入多
输出(Multi-input Multi-output) 三種通道模型下，可達到的整體速率具
有與系統容量相距固定間距的特性(within-constant-gap-to-capacity)。另
外，最值得一提的貢獻是本論文也提供了更有效率與低複雜運算量的
演算法，用以快速計算出整體可達到的傳輸速率範圍。
關鍵字：異質網路、交錯雙工模式、交錯式時分雙工/頻分雙工、
部分干擾消除策略、系統容量相距固定間距。

關鍵字

異質網路 ； 交錯雙工模式 ； 交錯式時分雙工/頻分雙工 ； 部分干擾消除策略 ； 系統容量相距固定間距

並列摘要

The requirement for wireless communications service has explosively grown
owing to the increasing number of mobile devices and mobile data traffic.
To satisfy this requirement, heterogeneous cellular networks have been proposed
and widely attracted attention both in cellular standards bodies as well as
academic search. The idea that deploying multiple small cells with coexisting
frequency in each of macro cells, forming called two-tier heterogeneous network,
can increase overall throughput. The concept of coexisting frequency is
spectrum sharing technique that also have been proposed to improve spectral
efficiency.
In this thesis, we will research the two-tier heterogeneous network (HetNet)
with sharing spectrum in reverse duplex mode. That reverse duplex mode
is that the direction of data transmission between macro and small cells is
reverse, e.g., macro cell is in uplink mode, whereas small cells are in downlink
mode, vice versa. Time/frequency division duplexing (TDD/FDD) can be
implemented by above reverse duplex mode, called as reverse TDD/FDD. We
can see this network as the interference channel model. We mainly propose
an approximately optimal mechanism for interference management, which
integrate reverse duplex mode and partial interference cancelling (PIC) scheme
or multilevel partial interference cancelling (MPIC) scheme. In addition, we
show its achievable overall sum-rate is characterized to within a constant-gapto-
capacity property for all values of the channel parameters under one-side
interference channel model, one-to-many interference channel model, and
Multi-input Multi-output (MIMO) two-tier HetNet model. The other significant
contribution we provided is on efficient and lowly complex computation
of achievable sum-rate algorithm.

並列關鍵字

reverse duplex ； partial interference cancelling scheme ； multilevel partial interference cancelling scheme ； small cell ； two-tier heterogeneous cellular network ； within a constant-gap-to-capacity property

參考文獻

2014–2019,” white paper, 2015.

[2] J. Mitola, “Cognitive radio for flexible mobile multimedia communications,” in

[4] T. S. Han, and K. Kobayashi. “A new achievable rate region for the Interference

Channel,” IEEE Trans. Inform. Theory, vol. IT-27, no. 1, pp. 49–60, Jan. 1981.

[5] R. H. Etkin, D. N. C. Tse, H. Wang, “Gaussian interference channel capacity to