There are different audio compression schemes in AMR based on the bit rate (kbit/s) & FULL RATE (FR) & HALF RATE (HR) channel selection.
Mode Bitrate (kbit/s) Channel
AMR_12.20 12.20
FR AMR_10.20 10.20
FR AMR_7.95 7.95
FR/HR AMR_7.40 7.40
FR/HR AMR_6.70 6.70
FR/HR AMR_5.90 5.90
FR/HR AMR_5.15 5.15
FR/HR AMR_4.75 4.75
FR/HR AMR_SID 1.80 FR/HR
BENEFITS OF AMR CODING ALGORITHM
There are a lot of benefits of using AMR coding in GSM networks. The most import are as following:
• 1) Positive Impact on Revenue
• Revenue generation is the most vital priority of any corporate service provider. AMR coding scheme can increase the revenue generation mechanism by following benefits:
• AMR adds capacity to densely populated areas to bring better speech quality.
• Users will experience a better service with fewer frustrating dropped calls.
• Enjoying more reliable and better speech quality, subscribers will be less likely to churn and are more encouraged to make extra voice calls, boosting traffic and revenue. In addition, day-today costs are reduced because fewer care centre calls will be made.
• 2) Lower investments in rural areas
• Meanwhile, AMR can cost-effectively extend mobile services into more distant rural areas to capture new subscribers. AMR increases individual base station cell size by about 30%, reducing the amount of investment needed in infrastructure because fewer base stations can be used to build coverage.
• With AMR, more voice minutes plus reduced expenditure equals higher profitability.
3) BASE STATION CELL COVERAGE COMPARISON
• 4) SUPERIOR RADIO PERFORMANCE
• The superior radio performance of AMR Full Rate and AMR Half Rate results from a dynamic increase in error correction.
• In poor network conditions when high numbers of errors occur, more bits are used for error correction to obtain robust coding. However, when transmission conditions are good, fewer bits are needed for error protection and more can be allocated for speech coding.
• Using an advanced algorithm, AMR dynamically switches between the GSM Full Rate traffic channel with a gross bit rate of 22.8 kbps and the GSM Half Rate traffic channel with a gross bit rate of 11.4 kbps. AMR also moves between different error correction levels within AMR Full Rate and AMR Half Rate.
• 5) BENEFITS OF NETWORKS USING SUFFICIENT FREQUENCY BANDS
• Operators currently using Enhanced Full Rate (EFR) coding can almost double their network voice capacity with AMR. This is because AMR Half Rate has roughly the same radio performance as EFR coding. The AMR Half Rate codec carries two calls on one time slot like the ordinary half rate but the quality & cell coverage is far better.
• The network dynamically chooses the AMR Full Rate or AMR Half Rate codec for each call. At high traffic loads the network uses AMR Half Rate extensively. When the network is less busy, it assigns AMR Full Rate coding to as many calls as possible, starting with those experiencing the poorest radio conditions.
• The network also chooses the best error correction level within AMR Full Rate and AMR Half Rate to achieve the best call quality. This process, known as codec mode adaptation, results in improved voice quality throughout the cell and increases overall coverage, but is especially noticeable at cell edges and deep inside buildings.
• 6) BENEFITS FOR FREQUENCY LIMITED NETWORKS
• This increased resilience to errors, and hence to interference, can be used to increase capacity by operating a tighter frequency reuse pattern.
• Under high load conditions, AMR enables the network to provide service to 140% more subscriber traffic from the same number of base station sites with voice quality even exceeding that of the EFR codec. In poor network conditions when interference is high; AMR dynamically shifts to Full Rate to achieve more robust coding that improves voice quality. In frequency limited networks, operators will gain the greatest CAPEX and
• OPEX savings because they can plan more transceivers (TRX) per site to significantly reduce the number of additional base station sites needed.
Mode Bitrate (kbit/s) Channel
AMR_12.20 12.20
FR AMR_10.20 10.20
FR AMR_7.95 7.95
FR/HR AMR_7.40 7.40
FR/HR AMR_6.70 6.70
FR/HR AMR_5.90 5.90
FR/HR AMR_5.15 5.15
FR/HR AMR_4.75 4.75
FR/HR AMR_SID 1.80 FR/HR
BENEFITS OF AMR CODING ALGORITHM
There are a lot of benefits of using AMR coding in GSM networks. The most import are as following:
• 1) Positive Impact on Revenue
• Revenue generation is the most vital priority of any corporate service provider. AMR coding scheme can increase the revenue generation mechanism by following benefits:
• AMR adds capacity to densely populated areas to bring better speech quality.
• Users will experience a better service with fewer frustrating dropped calls.
• Enjoying more reliable and better speech quality, subscribers will be less likely to churn and are more encouraged to make extra voice calls, boosting traffic and revenue. In addition, day-today costs are reduced because fewer care centre calls will be made.
• 2) Lower investments in rural areas
• Meanwhile, AMR can cost-effectively extend mobile services into more distant rural areas to capture new subscribers. AMR increases individual base station cell size by about 30%, reducing the amount of investment needed in infrastructure because fewer base stations can be used to build coverage.
• With AMR, more voice minutes plus reduced expenditure equals higher profitability.
3) BASE STATION CELL COVERAGE COMPARISON
• 4) SUPERIOR RADIO PERFORMANCE
• The superior radio performance of AMR Full Rate and AMR Half Rate results from a dynamic increase in error correction.
• In poor network conditions when high numbers of errors occur, more bits are used for error correction to obtain robust coding. However, when transmission conditions are good, fewer bits are needed for error protection and more can be allocated for speech coding.
• Using an advanced algorithm, AMR dynamically switches between the GSM Full Rate traffic channel with a gross bit rate of 22.8 kbps and the GSM Half Rate traffic channel with a gross bit rate of 11.4 kbps. AMR also moves between different error correction levels within AMR Full Rate and AMR Half Rate.
• 5) BENEFITS OF NETWORKS USING SUFFICIENT FREQUENCY BANDS
• Operators currently using Enhanced Full Rate (EFR) coding can almost double their network voice capacity with AMR. This is because AMR Half Rate has roughly the same radio performance as EFR coding. The AMR Half Rate codec carries two calls on one time slot like the ordinary half rate but the quality & cell coverage is far better.
• The network dynamically chooses the AMR Full Rate or AMR Half Rate codec for each call. At high traffic loads the network uses AMR Half Rate extensively. When the network is less busy, it assigns AMR Full Rate coding to as many calls as possible, starting with those experiencing the poorest radio conditions.
• The network also chooses the best error correction level within AMR Full Rate and AMR Half Rate to achieve the best call quality. This process, known as codec mode adaptation, results in improved voice quality throughout the cell and increases overall coverage, but is especially noticeable at cell edges and deep inside buildings.
• 6) BENEFITS FOR FREQUENCY LIMITED NETWORKS
• This increased resilience to errors, and hence to interference, can be used to increase capacity by operating a tighter frequency reuse pattern.
• Under high load conditions, AMR enables the network to provide service to 140% more subscriber traffic from the same number of base station sites with voice quality even exceeding that of the EFR codec. In poor network conditions when interference is high; AMR dynamically shifts to Full Rate to achieve more robust coding that improves voice quality. In frequency limited networks, operators will gain the greatest CAPEX and
• OPEX savings because they can plan more transceivers (TRX) per site to significantly reduce the number of additional base station sites needed.
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