Content
NATIONAL COMMUNICATIONS AUTHORITY
Quality of Service (QoS) Monitoring of Cellular Mobile Voice Services‐CENTRAL REGION
[May ‐ June 2015]
[Communications for Development] QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
Table of Contents 1. Background 2 2. What we measure 2 3. Findings 3-7 4. Remedies 8 5. Coverage Signal Strength 9-33
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
Background
In pursuance of Annexure D1 and D2 of the Cellular Mobile Licence of Telecommunication Operators, the consumer perspective of the quality of voice services are tested to ensure the compliance of Operators to the obligations on service quality to the user.
The report is based on findings on quality of service in Central region from May to June 2015 for all Operators except for Expresso due to their technical challenges.
What we measure
The Quality of Service monitoring system measures many parameters including coverage signal strength and voice quality. These parameters are in the 3G licence, a complementary licence to the Cellular Mobile Licence. The Voice Quality is measured by an ITU standard P.863 fondly called (POLQA) Perceptual Objective Listening Quality Assessment.
As per the Cellular Mobile licence obligations, the QoS indicators and their respective threshold for compliance under assessment considering the user’s perspective are as below;
Stand-alone Dedicated Control Channel (SDCCH) Congestion Rate Call Setup Time (CST) Call Congestion Rate Call Drop Rate ( CDR) Voice Call Audio Quality Coverage Signal Strength
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
Findings
The results for the cities and towns tested during the period are as below:
a) Stand-alone Dedicated Control Channel (SDCCH) Congestion Rate
SDCCH Congestion Rate should be equal or less than one per cent (1%).
SDCCH Congestion is defined as the probability of failure of accessing a stand-alone dedicated control channel during call set up.
For analysis and calculations,
Number of connect fails due to Immediate Assignment Failures SDCCH Congestion % 100% MOC call attempts
Table 1. Signalling Congestion Rate Cellular Mobile Voice Service, May-June 2015
Month City/Town MTN Vodafone Tigo Airtel Glo JUNE Kasoa 0 0 0 0 0 JUNE Swedru 0 0 0 0 0 JUNE Winneba 0 0 0 0 0 JUNE Elmina 0 0 0 0 0 JUNE Cape Coast 0 0 0 0 0 JUNE Ajumako 0 0 0 0 0 JUNE Saltpond 0 0 0 0 0 JUNE Twifo Praso 0 0 0 0 0 JUNE Assin Fosu 0 0 0 0 0
REMARK:
All Operators were in compliance in tested cities and towns with the signalling congestion threshold of less than 1 percent (1%).
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
b) Call Setup Time (CST)
CST should be less than ten seconds (<10secs) in 95% of cases.
Call Setup Time is the period of time elapsing from the sending of a complete destination address (target telephone number) to the setting up of a call to the receiving terminal;
Call set - up time s talerting signal taddress sending
talerting signal – Moment when an alerting signal is sent to the called terminal
taddress sending – Moment user presses the SEND button on the calling terminal
Table 2. Call Setup Time of Cellular Mobile Voice Service, May-June 2015
Month City/Town MTN Vodafone Tigo Airtel Glo JUNE Kasoa 10.41 9.8 8.9 13.1 8.9 JUNE Swedru 7.6 12.2 6.43 11.06 10.1 JUNE Winneba 6.44 9.66 6.3 5.6 8.8 JUNE Elmina 4.24 12.2 9.7 5.8 16.50 JUNE Cape Coast 5.49 6.95 6.6 9.22 6.3 JUNE Ajumako 4.58 10.6 6.0 8.18 9.2 JUNE Saltpond 4.34 7.18 7.0 4.2 4.70 JUNE Twifo Praso 6.0 4.5 6.3 4.3 No network JUNE Assin Fosu 4.42 10.2 6.05 6.3 5.9
REMARK:
All Operators except TIGO failed to meet the parameter threshold in certain localities.
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
c) Call Congestion Rate
Traffic Channel Congestion should be equal or less than one per cent (1%).
Call Congestion Rate is the probability of failure of accessing a traffic channel during call setup;
Number of Connect failed calls Call Congestion % 100% Total number of call attempts Table 3. Call Congestion Rate Cellular Mobile Voice Service, May-June 2015
Month City/Town MTN Vodafone Tigo Airtel Glo
JUNE Kasoa 0 0 0 0 0.6 JUNE Swedru 0 0 0 0 0 JUNE Winneba 0 0 0 0 0 JUNE Elmina 0 0 3.5 00 JUNE Cape Coast 0.45 0.44 6.1 00 JUNE Ajumako 0 0 0 0 0 JUNE Saltpond 0 0 0 0 0 JUNE Twifo Praso 0 0 0 0 No network JUNE Assin Fosu 0 0 0 0 0
REMARK:
All operators except Tigo remained compliant with the licence threshold of less than one percent (1%) in all the tested locations.
There is high traffic congestion on Tigo at Cape Coast and Elmina.
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
d) Call Drop Rate ( CDR)
Call drop rate should be equal or less than three per cent (3%).
Voice Call Drop Rate is the probability of a call terminating without any of the users’ will;
Number of calls terminated unwillingly Drop Rate % 100% Total number of call attempts
Table 4. Call Drop Rate Cellular Mobile Voice Service, May-June 2015
Month City/Town MTN Vodafone Tigo Airtel Glo JUNE Kasoa 0 0 0 0 0 JUNE Swedru 0 0 0 0 0 JUNE Winneba 0 0 0 0 0 JUNE Elmina 0 0 0 0 0 JUNE Cape Coast 0 0 0 0 0 JUNE Ajumako 0 0 0 0 0 JUNE Saltpond 0 0 0 0 0 JUNE Twifo Praso 0 0 0 0 0 JUNE Assin Fosu 0 0 0 0 0
REMARK:
All operators were in compliance with the Call Drop Rate licence threshold of less than three percent (3%) in all localities tested.
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
Voice Call Audio Quality - perceptibility of the conversation during a call. Voice Call Audio Quality is measured using a parameter called the Mean Opinion Score (MOS) which categorizes speech samples in ranges from 1 to 5. See legend below. This parameter is machine measured.
Table 5. Speech Quality Mean Opinion Score Central Region, May-June 2015
Central Region MTN Vodafone Tigo Airtel Glo MOS 3.4 3.8 3.2 3.3 3.5
REMARK:
Vodafone and Glo were assessed to give GOOD speech quality.
MTN, Airtel and Tigo were assessed to give FAIR speech quality.
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
REMEDIES
The NCA has notified Operators of publication of these findings and has directed all Operators in improve their coverage in some localities by December 2015.
Tigo has been directed to cure the traffic congestion at Cape Coast and Elmina, and also sanctioned for violating its TCH Congestion obligation in Central Region.
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QUALITY OF SERVICE (QoS) MONITORING OF CELLULAR MOBILE VOICE SERVICES IN CENTRAL REGION, MAY-JUNE 2015
COVERAGE SIGNAL STRENGTH
COVERAGE AND SPEECH MAPS
The Maps below show the coverage level and speech quality in various towns where monitoring was performed. The coverage map is a combination of both 2G and 3G network signal strength. In each plot is a legend to indicate definitions of signal strength and quality range attain by operators during measurement.
Coverage levels in green falls in the rage of -85dBm and above are considered good. Those between -85 and -95dBm are considered fair and are indicated in yellow. The red samples represent poor coverage in the range of -95 to -110dBm. The black samples represent areas with no coverage. The speech quality was assessed with Mean Opinion Score (MOS) which ranges from 5 to 1.
Coverage Legend
Colour Area Coverage Rating
Good Coverage Areas
Fair Coverage Areas
Poor Coverage Areas
None Existent Coverage Areas
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APPENDIX I
AIRTEL Fig. 1, Airtel Coverage , Ajumako June 2015
Airtel has a good coverage in Ajumako towards UCEW Campus but recorded very poor Coverage level at Enyan Denkyira and Esiam.
Fig. 2, Airtel Coverage, Winneba, June 2015
Airtel has poor Coverage around the Beach, parts of north Campus, Taxi Rank and Low Cost areas.
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Fig. 3, Airtel Coverage, Swedru, June 2015
Airtel has poor coverage around Afranse and Ekwamkrom area.
Fig. 4, Airtel Coverage, Twifo Praso. June 2015
Airtel has good 2G coverage at Twifo Praso
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Fig. 5, Airtel Coverage, Saltpond. June 2015
Good coverage in Saltpond with few spots of poor coverage
Fig. 6, Airtel Coverage, Kasoa. June 2015
Poor Coverage in Kasoa
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Fig. 7, Airtel Coverage, Kasoa. June 2015
Poor Coverage across Cape Coast
Fig. 8, Airtel Coverage, Elmina. June 2015
Poor Coverage at Elmina
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APPENDIX II
VODAFONE
Fig. 9, Vodafone coverage, Ajumako. June 2015
Good Coverage at Enyan Denkyira and Esam. However recorded poor coverage at parts of Ajumako township
Fig. 10, Vodafone Coverage, Winneba. June 2015
Good Coverage at Winneba. However an improvement is needed around the South Campus area.
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Fig. 11, Vodafone Coverage, Assin Fosu June 2015
Good coverage at Assin Fosu
Fig. 12, Vodafone Coverage, Swedru. June 2015
Good coverage at Agona Swedru yet requires improvement at the outskirts
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Fig. 13, Vodafone Coverage , Twifo Praso. June 2015
Good Coverage at Twifo Praso
Fig. 14, Vodafone Coverage , Saltpond. June 2015
Vodafone coverage needs improvement at Saltpond
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Fig.15, Vodafone Coverage, Kasoa. June 2015
Good Coverage at most parts of Kasoa. Coverage improvement is needed around the Millennium City and the Nyanano road area.
Fig. 16, Vodafone Coverage, Cape Coast. June 2015
Good Coverage at parts of Cape Coast. However, Tantri, First Ridge and parts of Cape Vars has poor coverage.
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Fig. 17, Vodafone Coverage, Elmina. June 2015
Poor Coverage in Elmina Town and Ankaful Junction.
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APPENDIX III
TIGO
Fig. 18, Tigo Coverage, Ajumako. June 2015
Good 2G coverage
Fig. 19, Tigo Coverage, Assin Fosu. June 2015
Poor coverage at the outskirts of Assin Fosu.
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Fig. 20, Tigo Coverage, Cape Coast. June 2015
Good Coverage with spots of poor coverage around Ekon and CapeVars.
Fig. 21, Tigo Coverage, Elmina. June 2015
Poor Coverage recorded around the Castle along to the Coconut Grove Resort and parts of the Takoradi Highway.
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Fig. 22, Tigo Coverage, Kasoa. June 2015
Poor Coverage at north Kasoa
Fig. 23, Tigo Coverage, Saltpond. June 2015
Good Coverage
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Fig. 24, Tigo Coverage, Twifo Praso, June 2015
Poor Coverage at the outskirts of Twifo Praso
Fig. 25, Tigo Coverage, Swedru. June 2015
Poor Coverage around Texaco and Afranse
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Fig. 26, Tigo Coverage, Winneba, June 2015
Poor coverage at Low cost, North and South Campus and along the beach .
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APPENDIX IV
GLO
Fig. 27, Glo Coverage, Ajumako, June 2015
Poor Coverage around Ajumako Town and Assasang.
Fig. 28, Glo Coverage, Assin Fosu, June 2015
Good Coverage with improvement required at some parts of the town.
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Fig. 29, Glo Coverage, Cape Coast, June 2015
Poor Coverage at Ola, Pedu and Ekon
Fig. 30, Glo Coverage, Elmina, June 2015
Poor Coverage at some parts of Cape Coast- Takoradi highway and the Coconut Grove link to the Highway
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Fig. 31, Glo Coverage, Kasoa, June 2015
Poor Coverage spots across Kasoa
Fig. 32, Glo Coverage, Swedru, June 2015
Poor Coverage around Asafo, Ekomkrom and parts of the Afranse road
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Fig. 33, Glo Coverage, Winneba, June 2015
Poor Coverage around Low Cost, North Campus, Winnesec Junction and Water works area.
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APPENDIX V
MTN
Fig. 34, MTN Coverage, Ajumako, June 2015
Poor coverage at Enyan Denkyira and Esiam.
Fig. 35, MTN Coverage, Assin Fosu, June 2015
Poor Coverage around Government Hospital area.
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Fig. 36, MTN Coverage, Cape Coast, June 2015
Good Coverage with scattered spots of poor coverage.
Fig. 37, MTN Coverage, Agona Swedru, June 2015
Poor Coverage at Afranse
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Fig. 38, MTN Coverage, Twifo Praso, June 2015
Good Coverage
Fig. 39, MTN Coverage, Winneba, June 2015
Poor Coverage at Low Cost, South Campus area and some few spots
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APPENDIX VI
SPEECH QUALITY FOR OPERATORS
Figure 40 Airtel Speech Quality report in Central Region
Figure 41 Vodafone Speech Quality report in Central Region
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Figure 43 Tigo Speech Quality report in Central Region
Figure 44 Glo Speech Quality report in Central Region
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Figure 45 MTN Speech Quality report in Central Region
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