GSM Specification for C/I and C/A

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GSM Specification for C/I and C/A

This article is about  C/I and C/A in GSM Technology

GSM specifications recommend that the carrier-to interference (C/I) ratio is greater than 9 decibels (dB).
GSM specification states that the carrier-to-adjacent ratio (C/A) be greater than -9dB.

GSM specifications for C/I and C/A

Quality

Quality reflects RF environment in call mode. It is measured as Received Quality (Rx-Qual), and is heavily dependent on interference. Rx-Qual is measured in terms of Bit Error Rate (BER). There are eight ranges of BER that reflect upon Rx-Qual; higher the BER, worse will be Rx-Qual. Rx-Qual mapping with respect to BER is shown below:

  BER Values for RxQual

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