TD-SCDMA动态信道分配技术研究(英文)
TD-SCDMA动态信道分配技术研究(英文)(任务书,开题报告,论文8000字)
The Dynamic Channel Allocation inTD-SCDMASystem
摘要
在TD-SCDMA系统中，有一个问题，非急救语音服务掉线概率不理想时，我们使用动态分配算法。为了解决这个问题，我们提出了一种新的算法，它被称为保护信道预留队列移动边界动态信道分配。该算法在预留信道的情况下，对非紧急语音服务服务的调用，以保持阻塞概率为服务，引入无患者客户，并结合数据包进行借阅。仿真结果表明，与移动边界算法相比，该算法降低了非紧急话音业务的丢包率，维护了多种业务的阻塞概率，减少了数据包丢失的概率数据业务。
当这项研究开始，TD-SCDMA（时分同步码分多址）仍在研发阶段，但现在，这项技术已被广泛使用。然而，在我国的TD-SCDMA试验期间，从2006年开始，一些干扰问题已经在网络规划和初始化阶段特别受到关注。干扰一直是一个问题，在任何网络和本论文的工作目标都是在有干扰的情况下提高网络覆盖和容量。本文基于TD-SCDMA网络的工作原理及干扰的形成原因，对传统N频技术的网络提出了改进。本文引入的同心圆蜂窝的概念，并加入一个中继网络，使其他用户可以利用蜂窝的边缘。这种整体的方法不仅优化了抗干扰的能力，并且在不增加更多节点基站的前提下增加了网络覆盖。 [资料来源：http://doc163.com]
关键词：TD-SCDMA；可移动边界动态信道分配；不耐烦顾客；信道保留
Abstract
In the TD-SCDMA system, there is a problem that non-emergency voice services probability of dropped call is not ideal when we use the dynamic allocation algorithm. To solve this problem, we propose a new algorithm, which is called protect channel reservation queue movable boundary dynamic channel allocation. This algorithm set aside channels for dropped calls of non-emergency voice services service, in order to keep blocking probability for service, the introduction of no patient customers, combined with the data packet to borrow algorithms. Simulation results show that, comparing to the movable boundary algorithm, the proposed algorithm reduce the drop probability for non-emergency voice services, and maintain a variety of service blocking probability, reducing the packet loss probability data services.
When this research was started, TD-SCDMA (Time Division Synchronous Code Division Multiple Access) was still in the research/development phase, but now, it is used widely. However, during the pre-commercial TD-SCDM trail in China, which started from year 2006, some interference problems have been noticed especially in the network planning and initialization phases. Interference is always an issue in any network and the goal of the work reported in this thesis is to improve network coverage and capacity in the presence of interference. Based on an analysis of TD-SCDMA issues and how network interference arises, this thesis proposes two enhancements to the network in addition to the standard N-frequency technique. These are the introduction of the concentric circle cell concept and the addition of a relay network that makes use of other users at the cell boundary. This overall approach not only optimizes the resilience to interference but increases the network coverage without adding more NodeBaseStation. [版权所有：http://DOC163.com]
Keywords: TD-SCDMA; movable boundary dynamic channel allocation; impatient customers; channel reservation
Abstract II
摘要 III
Chapter 1 Introduction
1.1 Introduction of TD-SCDMA 1
1.2 3G Mobile Networks 3
Chapter 2Radio Access Technique in TD-SCDMA
2.1 The Frame Structure of TD-SCDMA 7
2.2 Combined TDMA/TDD and CDMA operation 8
2.3 Joint Detection in TD-S CDMA 9
2.4 Smart Antennas 10
2.5 Dynamic Channel Allocation 11 [来源：http://www.doc163.com]
2.6 Terminal Synchronisation 12
2.7 N-Frequency in TD-SCDMA 13
2.8 Concentric Circles Cell 14
2.9 Multi-carrier HSDPA in TD-SCDMA 15
2.10 Relay Networks 16
2.11 Summary 18
Chapter 3 A Dynamic Channel Allocationin TD-SCDMA System
3.1 Queue Movable Boundary Dynamic Channel Allocation Algorithms 19
3.2 The Design Ideas of Channel Reservation Movable Boundary Algorithm 20
3.3 Performance Analysis 22
3.3.1 New User Access 22
3.3.2 Loop Detection 23
3.4 Simulation Results and Analysis 23
3.4 Conclusion 29
Abbreviations 30
References 33