Globalisering als nieuw stadium van het kapitalisme - Krisis
National Sports Stadium Traffic
6
National Sports Stadium Traffic Date: 02/06/14 Team: Harare Optimization Background: Network performance complaints were received after the soccer match between Zimbabwe and Tanzania on the 1 st of June. Subscribers reported failure to access data services using Whatsapp and the Web. This report looks at the traffic [voice and data] trends during this event and suggests mitigating measures for future occasions. Summary The 2G and 3G cells covering the National Sports Stadium saw an up surge in traffic during the match between Zimbabwe and Tanzania. On 2G cells this resulted in SDCCH congestion. Additional signal load came from LAU as this area is a border for three location areas (BSC1, 2 and 5). On 3G cells, RAB failures resulted due to lack of DL Power and lack of codes. Conclusions 1. All 2G cells covering the stadium are MBC and should have enough TCH capacity. Equip to maximum capacity 2. SDCCH congestion due to LAU can be minimized through SDCCH re-dimensioning and Adaptive Configuration of Logical Channels tuning. This active already. Relocate to ZWBS1 3. 2G Antenna down tilt can also be used together with reselection hysteresis to minimize ping pong reselections. To be implemented by optimization 4. Half-rate can be tuned to reduce half rate utilization. To verify with reporter. 5. 3G DL power can be improved by power amplifier upgrade of the National Stadium site. 6. It is suspected the National Stadium 3G cells could be overshooting. Making sure the cells cover mainly the national sports stadium can improve performance. 7. A COW solution can be used to offer additional capacity should it make business sense. This requires that the dates of such events is known in advance. 8. 3G parameter soft tuning can also be attempted to, for example, off load voice traffic from 3G to 2G. This requires that the dates of such events is known in advance. 9. Micro site solutions for dates of events.
Transcript of National Sports Stadium Traffic
National Sports Stadium Traffic
Date: 02/06/14
Team: Harare Optimization
Background: Network performance complaints were received after the soccer match between
Zimbabwe and Tanzania on the 1st of June. Subscribers reported failure to access data services using
Whatsapp and the Web. This report looks at the traffic [voice and data] trends during this event and
suggests mitigating measures for future occasions.
Summary
The 2G and 3G cells covering the National Sports Stadium saw an up surge in traffic during the match
between Zimbabwe and Tanzania. On 2G cells this resulted in SDCCH congestion. Additional signal load
came from LAU as this area is a border for three location areas (BSC1, 2 and 5). On 3G cells, RAB failures
resulted due to lack of DL Power and lack of codes.
Conclusions
1. All 2G cells covering the stadium are MBC and should have enough TCH capacity. Equip to
maximum capacity
2. SDCCH congestion due to LAU can be minimized through SDCCH re-dimensioning and Adaptive
Configuration of Logical Channels tuning. This active already. Relocate to ZWBS1
3. 2G Antenna down tilt can also be used together with reselection hysteresis to minimize ping
pong reselections. To be implemented by optimization
4. Half-rate can be tuned to reduce half rate utilization. To verify with reporter.
5. 3G DL power can be improved by power amplifier upgrade of the National Stadium site.
6. It is suspected the National Stadium 3G cells could be overshooting. Making sure the cells cover
mainly the national sports stadium can improve performance.
7. A COW solution can be used to offer additional capacity should it make business sense. This
requires that the dates of such events is known in advance.
8. 3G parameter soft tuning can also be attempted to, for example, off load voice traffic from 3G
to 2G. This requires that the dates of such events is known in advance.
9. Micro site solutions for dates of events.
The graphs below show various trends showing how the event at the National Sports Stadium affected
the surrounding cells.
High TCH traffic is seen on 0391MMA/B (National Stadium cells) and 0285MMC (Bisley Circle cell).
TCH congestion remained low for all the cells covering the National Stadium. Half rate thresholds need
to be checked if they are not triggering half rate too early.
All 2G cells covering the National Sport stadium saw a sharp increase in SDCCH traffic.
High SDCCH traffic resulted in signaling congestion on most cells. 0391MMA and B are the only cells that
attempted to use dynamic SDCCH. These configurations will need to be checked.
There was a marginal increaseof 2G data. Allocation failure rates are typically high on the 2G network
due to pressure on transport resources. On this occasion the allocation failures worsened.
During the event RRC connections failed due to admission control (lack of resources) and high main
processor loads.
As the graphs on RAB failures show, lack of DL power and codes were the main causes of RAB setup
failures.
Channel element utilization went up significantly for the site NatSportStadium. As can be seen in the
graph below, this was due to a significant increase in traffic.
