LTE CoMP技术深度解析
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"有关LTE CoMP的文章"
这篇关于“LTE CoMP”的文章深入探讨了LTE（长期演进）系统中的协调多点（CoMP）技术，这是3GPP（第三代合作伙伴计划）在Release 8标准中引入的一个关键特性，旨在提升移动通信系统的性能和效率。CoMP是一种利用多点传输协调来优化无线网络性能的技术，特别是对于提高小区边缘用户的吞吐量和降低干扰具有显著效果。
在LTE系统中，CoMP通过在多个eNodeB（演进型节点B）之间进行协调传输和接收来实现。这种协调可以是集中式的，其中多个基站共享信息并共同决定如何发送数据；也可以是分布式的，基站间虽然不交换所有信息，但依然能协同工作来减少干扰。图(a)可能描绘了这种eNodeB之间的协作关系。
文章可能涵盖了以下几个方面：
1. CoMP的类型：CoMP主要分为联合传输（Joint Transmission, JT）、协调调度（Coordinated Scheduling, CS）和干扰消除（Interference Cancellation, IC）。JT允许多个基站同时向一个用户发送数据，CS是基站根据全局信息选择最佳发射点，而IC则是基站尝试消除接收到的其他基站的信号。
2. 性能提升：CoMP的主要目标是改善小区边缘的用户体验，减少多用户间的干扰，提高频谱效率和系统容量。这通过改进信噪比、降低误码率以及提升数据传输速率来实现。
3. 技术挑战：CoMP实施面临的挑战包括实时协调需求、复杂的信令开销、以及对网络基础设施的高要求，如更强大的回传链路和更复杂的数据处理算法。
4. 标准进展：在3GPP Release 8之后，CoMP继续在后续版本中得到发展和完善，如Release 10和11，以适应不断增长的移动数据需求和IMT-Advanced（国际移动通信-先进）标准的要求。
5. 实际部署：文章可能讨论了CoMP在实际网络部署中的策略和案例，包括不同场景下的最佳实践，以及如何与网络的其他部分（如载波聚合、MIMO等技术）集成。
6. 未来展望：随着5G网络的发展，CoMP可能会进一步演进，比如与 Massive MIMO 结合，以提供更高效、更灵活的无线资源管理。
这篇文章提供了关于LTE CoMP的全面概述，包括其原理、应用和潜在优势，对于理解移动通信网络优化和未来技术发展趋势具有重要意义。
IEEE Wireless Communications • June 2010
26
1536-1284/10/$25.00 © 2010 IEEE
(a)
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COORDINATED AND DISTRIBUTED MIMO
INTRODUCTION
In the Third Generation Partnership Project
(3GPP), the specifications for the Universal
Mobile Telecommunications System (UMTS)
Long-Term Evolution (LTE) called the evolved
universal terrestrial radio access (UTRA) and uni-
versal terrestrial radio access network (UTRAN)
were completed as Release 8 [1, 2]. Release 8
LTE supports only efficient packet-based radio
access and radio access networks that provide
Internet Protocol (IP)-based functionalities with
low latency and low cost. After the completion of
the specifications, commercial equipment is under
development aiming at the forthcoming launch of
broadband radio access services.
The principle behind international standard-
ization of International Mobile Telecommunica-
tion (IMT)-Advanced and the new spectra for
IMT were agreed upon at the Radiocommunica-
tion Assembly 2007 (RA ’07) and the World
Radiocommunication Conference 2007 (WRC
’07) in the International Telecommunication
Union — Radiocommunication Sector (ITU-R),
respectively [3]. With the circular letter (CL) to
invite proposals for IMT-Advanced radio inter-
face technologies as the motivation, the 3GPP
initiated a Study Item (SI, i.e., feasibility study)
for LTE-Advanced in March 2008. In the 3GPP,
LTE-Advanced represents LTE enhancement in
Release 10 and beyond. The system require-
ments for LTE-Advanced were agreed upon in
[4]. The technical components to achieve the
system requirements were discussed in the 3GPP,
and summarized in a technical report [5]. Based
on Release 8 LTE and agreements on LTE-
Advanced, the 3GPP submitted its final proposal
to the ITU-R as a complete submission in Octo-
ber 2009. Following the SI, Work Items (WIs,
i.e., specification work) for the LTE-Advanced
radio interface in Release 10 were initiated and
it is expected that the specifications will be com-
pleted according to the IMT-Advanced stan-
dardization schedule. In addition to multiple
access schemes, advanced multiple-input multi-
ple-output (MIMO) channel transmission tech-
niques and elaborate coordination among
multiple cell sites called coordinated multipoint
(CoMP) transmission/reception were adopted as
key techniques for LTE-Advanced at the Tech-
nical Specification Group — Radio Access Net-
work (TSG-RAN) Working Group 1 (WG1)
meeting in the 3GPP [5].
In this article we present the purpose for
CoMP based on the system requirements, and
actual CoMP transmission and reception
schemes for LTE-Advanced based on the discus-
sion in the 3GPP. In the rest of the article we
first address major radio access techniques
including intercell interference coordination
(ICIC) in the Release 8 LTE, which form the
basis for the radio interface for LTE-Advanced.
Then we explain the necessity for CoMP trans-
mission and reception to satisfy the system
requirements in terms of capacity and cell edge
user throughput through tighter intercell orthog-
onality as well as intracell orthogonality among
simultaneously accessing sets of user equipment
(UE) in LTE-Advanced. To achieve intercell
MAMORU SAWAHASHI, TOKYO CITY UNIVERSITY
YOSHIHISA KISHIYAMA, AKIHITO MORIMOTO, DAISUKE NISHIKAWA, AND MOTOHIRO TANNO,
NTT DOCOMO, I
NC.
ABSTRACT
This article presents an elaborate coordina-
tion technique among multiple cell sites called
coordinated multipoint transmission and recep-
tion in the Third Generation Partnership Project
for LTE-Advanced. After addressing major radio
access techniques in the LTE Release 8 specifica-
tions, system requirements and applied radio
access techniques that satisfy the requirements
for LTE-Advanced are described including
CoMP transmission and reception. Then CoMP
transmission and reception schemes and the
related radio interface, which were agreed upon
or are currently being discussed in the 3GPP, are
presented. Finally, system-level simulation evalu-
ations show that the CoMP transmission and
reception schemes have a significant effect in
terms of improving the cell edge user throughput
based on LTE-Advanced simulation conditions.
COORDINATED MULTIPOINT
TRANSMISSION/RECEPTION TECHNIQUES FOR
LTE-ADVANCED
The authors present
an elaborate
coordination
technique among
multiple cell sites
called coordinated
multi-point
transmission and
reception in the
3rd generation
partnership project
for LTE-Advanced.
SAWAHASHI LAYOUT 6/9/10 10:39 AM Page 26
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