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EMR is a new downlink measurement report introduced to 3GPP Release 99. The 3GPP TS 44.018 stipulates that the network should command the MS to report the measurement information on the serving cell and neighboring cells by MR or EMR through Measurement Information (MI) or SI 2quater. Compared with the MR, the EMR provides additional measurement contents as follows:
l The EMR uses an optimized coding scheme for neighboring cell information, and thus provides information on more neighboring cells than the MR does. For example, the MR can carry the information on up to 6 neighboring GSM cells while the EMR can provide the information on up to 15 neighboring GSM cells. This ensures better performance for interoperability between GSM and meets the requirement for service continuity.
l The EMR includes the Bit Error Probability (BEP) for identifying the channel quality. Estimated on a per burst basis, BEP is a comprehensive criteria for reflecting the C/I ratio, signal delay extension, and MS speed. In addition, BEP is coded in five bits while Receive Quality (RXQUAL) in three bits.
The RXQUAL value is converted from the Bit Error Ratio (BER).
l EMR contains the number of correctly received speech frames for calculating the Frame Erase Ratio (FER). FER is the measurement of the coding/decoding performance of the speech signals while RXQUAL is the measurement of the radio signals. Therefore, FER outperforms RXQUAL in terms of speech quality measurement.
BEP and FER can improve the performance of the algorithms that operate on the basis of the radio signal quality. They can replace the RXQUAL that is commonly used as an indicator of the radio signal quality. In this way, the performance of the power control algorithms and handover algorithms can be improved.
Figure 2-1 shows the procedure for sending the EMR.
Figure 2-1 Procedure for sending the EMR
