Why its require to know about MIMO and Beam Forming Implementation in LTE Planning

Here I write another two step in LTE planning and why its require to know. Starting from MIMO and Beam Forming Implementation and Understanding of Current Transmission Backhaul Network Capability of operator


MIMO and Beam Forming Implementation

The number of antenna deployed per cell will have an immediate impact on the coverage and capacity offered by diversity based technology like LTE. As a major application for LTE TDD, beam forming is very similar to the diversity transmission, the main difference being that in beam forming one typically considers a physical antenna beam being constructed towards the UE.

So for best result, beam forming requires closely spaced antennae and this is unlike the MIMO diversity schemes which require at least a few wavelength antenna spacing. However, due to installation limitation, beams will be at least a few wavelength apart but the arrival of higher transmit/receive order antenna may well change this situation in the future.

However, radio engineers need to remember the addition of new antennae may incur extra CAPEX and OPEX cost on the operator due to extra mounting pole requirement so prior operator discussion is recommended.

Cyclic Prefix Planning

Radio engineer should also discuss with operator to ensure any sites needing extended coverage are addressed by using the Long Cyclic Prefix configuration.

Understanding of Current Transmission Backhaul Network Capability

Radio planners should regularly report and remind core and transmission network designers about the LTE access network transmission capacity requirement based on operator edge throughput and traffic requirement. An appropriate buffer needs to be provisioned by the transmission planners as there will be extra loading due to S1/X2 interfaces. Result of backhaul congestion will be slower user throughput, possible drop call and QoS/QoE degradation.

Although the expansion of backhaul capacity will normally occur in conjunction with LTE access network rollout, it is still essential to ensure no commitment of radio access throughput beyond backhaul latency, capability and capacity is made. Transmission expansion based on microwave could be lengthy from a time perspective due to various technical and spectrum regulations so radio planners should report their requirement as soon as possible.

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