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Interference co-ordination and Cancellation techniques?

+3 votes
2,244 views

I tried a lot to understand this networks in LTE. Can someone please help me here and make it easy for me by giving an overview of this method?
Thanks in Advance.

posted Jun 9, 2014 by Sandeep Bedi

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2 Answers

+1 vote

Overview:
The challenge with deploying a static N = 1 frequency re-use OFDM system in an interference limited environment is that for a fully loaded deployment, significant regions of coverage will experience negative SINR levels, resulting in gaps in the deployed coverage, irrespective of the inter-cell distance.

Figure given below illustrates a typical SINR distribution for 100 percent loading, as measured in an urban LTE trial deployment with nine cells.

SINR in urban area in LTE

It can be seen that on the order of 15 percent of users will experience negative SINR, with some users experiencing negative SINR levels of –10 to –15 dB. It should be noted that in a fully loaded interference limited cellular deployment the severity of the SINR degradation will be highly dependent on the average path loss exponent. For a cellular deployment with a fixed inter-cell distance, high path loss propagation environments with path loss exponents up to a 5th or 6th order will experience less overall interference than deployments with lower path loss exponents, since potential interfering signals from neighboring cells will be more greatly attenuated in the former case. Even though there will be significant SINR variation depending on the propagation environment, in order to robustly deploy an LTE OFDM system one will have to mitigate the inevitable negative SINR coverage regions that will exist.

The following sections provide an overview of a number of techniques to address the potential SINR coverage holes, including power control, both static fractional frequency reuse (FFR) and adaptive fractional frequency reuse (AFFR), AFFR with tiering, intelligent SINR based scheduling, opportunistic scheduling and access techniques, multiple-input multiple-output (MIMO), and space division multiple access (SDMA) antenna techniques, as well as beamforming.

Note that these techniques can be based on both intra and inter-base station communication approaches.

For complete understanding better to follow this 7 Page document

answer Jun 10, 2014 by Puneet Batra
+1 vote

In its simplistic form, ICIC is a kind of frequency diversity technique used in LTE to minimize interference at cell borders. Lets say if you have 15 Mhz spectrum, whole bandwidth will be used at cell center while at cell edge, only 5 Mhz will be used giving 1x3 frequency re-use.

answer Jun 10, 2014 by Faisal Adeem Siddiqui
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+1 vote

I have the RSRQ values but i want to calculate SINR, can someone help and explain the method too.

+6 votes

As per my knowledge, LTE technology has frequency reuse factor 1, which means same frequency can be used two or more eNodeBs. As per my knowledge, cell interference can be controlled by using different PCI to each of the neighbor nodes.

I want to know, Are there any other things being used to avoid cell interference in lte technology or just PCI i.e physical cell identity is just enough to avoid cell interference.

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