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Information<br />
shared<br />
between sites<br />
CoMP<br />
Algorithms<br />
Backhaul<br />
Properties<br />
Table 8.1. Summary of the Characteristics of Each Type of CoMP Architecture. 128<br />
Intra-eNB<br />
Intra-site<br />
Vendor<br />
Internal<br />
Interface<br />
Coordinated<br />
Scheduling,<br />
Coordinated<br />
Beamforming,<br />
JP<br />
Baseband Interface<br />
over small distances<br />
provides very small<br />
latencies and ample<br />
bandwidth<br />
Intra-eNB<br />
Inter-site<br />
CSI/CQI,<br />
Scheduling<br />
info<br />
Coordinated<br />
Scheduling,<br />
Coordinated<br />
Beamforming,<br />
JP<br />
Fiber-connected<br />
RRH provides small<br />
latencies and ample<br />
bandwidth<br />
Inter-eNB<br />
Inter-site<br />
(1)<br />
An interesting CoMP architecture is the one associated with a distributed eNB depicted in Figure 8.2. In<br />
this particular illustration, the Radio Remote Units (RRU) of an eNB are located at different locations in<br />
space. With this architecture, although the CoMP coordination is within a single eNB, the CoMP<br />
transmission can behave like inter-site CoMP instead.<br />
Figure 8.2. An Illustration of Intra-eNB CoMP with a Distributed eNB.<br />
128 MIMO Transmission Schemes for LTE and HSPA Networks, 3G <strong>Americas</strong>, June 2009.<br />
CSI/CQI,<br />
Scheduling<br />
Info<br />
Coordinated<br />
Scheduling,<br />
Coordinated<br />
Beamforming<br />
Requires small<br />
latencies only.<br />
Inter-eNB<br />
Inter-site<br />
(2)<br />
Traffic +<br />
CSI/CQI,<br />
Scheduling<br />
Info<br />
Coordinated<br />
Scheduling (CS),<br />
Coordinated<br />
Beamforming,<br />
JP<br />
Requires small<br />
latencies.<br />
Bandwidth<br />
dominated by<br />
traffic.<br />
www.4gamericas.org February 2011 Page 82
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