Impact of AMR over other KPI

Impact on Congestion Rate

--AMR increases the system capacity by decreasing the TCH congestion rate. AMR improves the capacity of the TCHs but not the capacity of the SDCCHs. Thus, AMR cannot decrease the SDCCH congestion rate.

Impact on Traffic Volume

--AMR has a strong anti-interference capability. Users in some weak coverage areas where calls fail to be made can make calls after AMR is enabled. The possibility of hangup is reduced. Therefore, the traffic volume is increased.

Impact on Handover

--AMR optimizes the speech codec but not the signaling codec. Theoretically therefore, AMR does not significantly affect handover. AMR can, however, expand the radio coverage of the network; therefore, users in weak coverage areas can make calls. As a result, the receive quality carried in the measurement report is poor, and the bad quality handover is triggered. In other words, the number of bad quality handovers may increase after AMR is enabled.

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