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By the WiMAX Forum

The purpose of this article is to provide guidance on the deployment of adjacent synchronized WiMAX TDD systems in the same geographical area. The target adjacent channel interference rejection figures are assessed based on simulation assuming the same cell characteristics and a consequential frequency separation (guard frequency) is estimated in order to reduce the interference impact between the two systems to a certain acceptable level.

In the case of synchronized TDD systems, the BS to BS and the MS to MS interference scenarios are not relevant therefore two simulation scenarios between two adjacent TDD systems are considered:

• Scenario 1: (downlink), BS to MS interference scenario.
• Scenario 2: (uplink), MS to BS interference scenario.

Capacity degradation in the victim cell caused by interference from the adjacent channel is used as the evaluation metric and 3% capacity degradation ratio is assumed as an acceptable figure. In these scenarios, the system level simulation (SLS) assumed a 2 tier and 19 cell configuration. The required ACIR value and the consequential guard band are analyzed to meet the acceptable capacity degradation criteria, against a range of distances between the BSs of two systems.

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•White Paper: TDD-TDD Interference Analysis Involving Synchronized WiMAX Systems