Analysis of controlling traffic during busy hours to avoid system overload
With the development of the social and communications undertakings, the relationship between people and telecommunications is getting closer and closer, and business development is on the rise every year, especially during the Spring Festival, Mid-Autumn Festival, preferential hours and major social activities, etc. The sudden increase will cause overloading of the switch system, circuit congestion, drop in connection rate and availability, and even the paralysis of the switch, causing irreparable losses for enterprises and individuals. For this reason, how to control traffic during busy hours to avoid system overload is a very important issue. Let me combine my work experience and take the EWSD switch of Beijing Fangzhuang GW2 Bureau as an example to discuss this issue with you.
The GW2 office is the Unicom interface office, which undertakes all communication tasks between 130 mobile phone users and the fixed network, and the traffic volume is relatively large. In order to ensure the smooth communication during busy hours, we firstly predict the growth trend of the traffic volume relatively accurately based on the usual traffic statistics report and the volume of traffic in the same period in the past. Situation control method. In EWSDV11, MASSC (large traffic control) is available, but MASSC is more effective for sudden and short-duration large traffic, if it is for long-duration, predictable large traffic In terms of quantity, I think it is more appropriate to use intercept codes (CBPT). The specific settings are as follows:
1 Establishment of recording channel
(1) CRDEST: DEST = DAS01;
(2) CRANGRP: TGNO = ADAS01;
(3) CRANLN: TGNO = ADAS01, LNO = 1, EQN = XXXX;
(4) CRROUTE: ROUTE = 1, SSDI = X, TGNO = ADAS01, DEST = DAS01;
(5) CRCPT: CODE = A001, DEST = DAS01;
(6) CRZOPT: CODE = A001, ZOCHA = NOPULSE;
(7) CRINC: CODE = A001, INRES = NEWCOD, INCEPT = NETWOMA0;
2 Establishment of Intercept Code
CRCBPT: CODE = X, PERC = PERCXX, INCEPT = NETWOMA0;
3 Deletion of interception codes
CANCBPT: CODE = X;
The percentage of restricted traffic in the establishment of intercept codes needs to be determined according to specific circumstances. It is necessary to consider the switch load, but also depends on the number of related office trunks and the connection rate.
January 23, 2001 (Lunar New Year's Eve) is a day of family reunion In response, Table 1 is a statistical report of the traffic volume in 5 time periods. The data provided is in 15-minute units.
According to the statistics of traffic in Table 1, after 21:00, the traffic carried by the switch remained high, and the peak of traffic continued and climbed, reaching its peak at 0:00, and then gradually declined. The connection rate that night was 20% lower than the normal period, and a considerable number of calls were lost. Compared with the traffic of the exchange at normal times, the call volume increased by 50% to 60% that night. The calls of both sides of the city and Unicom fluctuated greatly over time. The peak traffic volume was concentrated around 00:00, while the traffic volume in the long-distance direction High but not volatile. According to this situation, I have made different percentages of traffic control for different office directions in different time periods to balance the trunk load. The specific situation is shown in Table 2.
Restricted long distance
Restrict local calls
Of course, the preset traffic limit percentage is affected by some subjective and objective factors, which will inevitably cause calculation errors. This requires maintenance personnel to analyze relevant statistical reports, master the operation of the switch, and maximize the use of system resources The switch is in a relatively efficient and stable state.
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