In this paper, through the optimization of the network of an Alcatel mobile switching equipment, the analysis and comparison process of the difference between the occurrence of the connection rate during the day and night, briefly introduced the ideas and analysis methods of how to deal with this type of problem [Fault phenomenon]: Local network time Total number of system pagings Total number of called responses Total number of call attempts by the switch Total number of switch-on attempts Switch-on rate Paging success rate [Fault Analysis]: ã€Solution】: [Lessons or suggestions and summary]: Zhou Qichuan graduated from Chengdu University of Technology, a test engineer in the exchange office of Chengdu Communications Construction Engineering Bureau. He has long been engaged in the implementation of mobile softswitch program-controlled machine exchange testing and other projects. He has accumulated rich theoretical and practical knowledge of the exchange core network, and is actively participating in Alcatel mobile exchange network In engineering such as optimization, a deep understanding of mobile core network optimization.
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[Keywords] SACECP MRSACE module message signaling load connection rate paging switch algorithm trial call times
In some places during the night when mobile softswitches occur, the switch connection rate is low. Take May 23 as an example, as shown in the following table:
MSC1 2007-05-23 09:00 228783 213332 0.932464 0.943887
MSC1 2007-05-23 23:00 55866 47921 0.857785 0.956357
The switch connection rate between 10 o'clock and 11 o'clock and the switch switch between 23 o'clock and 24 o'clock differ by 7.4%.
The switch connection rate algorithm is as follows:
Switch Connectivity Rate = Number of Calls Established by the Switch / Total Number of Calls Tryed by the Switch = Total Number of Calls Called by the Switch = Total number of times the switch sent a "call proceeding" message and received an "IAM or IAI" message minus the inter-office handover request News.
The number of times that the exchange established a call = the total number of times the exchange received the "call confirmed" and "ACM" messages minus the inter-office handover request message.
The factors that can affect the switch connection rate are:
1. Success rate of HLR query
2. Paging success rate
3. The success rate of TCH assignment on the calling side
4. Success rate of inter-office cut-in
5. Outgoing IAM returns to ACM low analysis above report
1. The switch-through rate of the switch decreases due to the decrease of the success rate of HLR query:
The HLR query success rate was 91.5% on the 23rd during busy hours, and the HLR query success rate was 83.5% from 23: 00-24: 00 in the evening. According to the busy hour success rate, HLR queries failed more than 26260 × 91.5% -21925 = 2102.9, resulting in call loss = 2102.9 / 55866 * 100% = 3.76%
2. The low paging success rate causes the switch connection rate to decrease:
If the paging success rate is low, the number of CALL CONFIRM in the numerator needs to be added with additional paging loss (in addition to engineering reasons and internal obstacles in the switch, user behavior is also a sudden decrease in the paging success rate of the switch in certain periods important reason). In the statistical report on the 23rd, the paging success rate is normal, so paging loss is not counted.
3. The decrease of switch connection rate caused by the decrease of TCH ASSIGN success rate:
TCH assignment does not distinguish between the calling party and the called party. The ratio of the two counters of MS calling trial and MS calling trial is used to divide whether the TCH Assignment is the calling side or the called side. The failure of the called side's TCH has no effect on the connection rate (because after CallConfirm), only the difference between the calling side's TCH allocation failure and the busy time at night is considered.
On the night of the 23rd, the proportion of MS calling attempts = MS Orig Att / (MS Orig Att + MS Term Att) = 64.24%
According to the success rate during the day, TCH Assign has more failures = 42896 * 98.42% -40933 = 1285, where the caller ’s side is spread to 1285 × 64.24% = 825. These failures will affect the connection rate (through Call Proceeding, not to Call confirm).
The resulting call loss = 825/55866 * 100% = 1.47%
4. The switch connection rate caused by the failure of inter-office cut-in:
After each handover failure, a retry will be initiated, which will cause the user to generate multiple handover requests for one actual handover. The switch request statistics in the switch statistics are PREPARE HANDOVER messages on the MAP. In the above case, a switch will generate multiple PREPARE HANDOVER messages, but only successful incoming switch will generate IAM messages, so SPATIAL uses MAP messages for statistics When the success rate of incoming handover is very low, IAM messages generated by handover incoming will be calculated more.
The success rate of inter-office switch-in between the 23 o'clock period and the 9 o'clock period is basically the same. Therefore, the problem that the switch connection rate drops has nothing to do with the inter-office switching.
5. Outgoing IAM and low ACM result in low switch connection rate:
ACM / IAM is lower at night than during the day. The period from 23 o'clock to 24 o'clock is about 1% lower than the period from 9 o'clock to 10 o'clock.
According to the analysis, the overall difference in various causes of call loss is 6.2%. Compared with the 7.4% gap between night and busy hours, there is still 1 percentage point, which is within the acceptable range.
After analysis, the difference in the connection rate between sooner and later is not caused by the problem of the switch, but is caused by a combination of user reasons, wireless environment reasons, and related office directions.
In the face of such problems, it is necessary to combine the analysis of the signaling process and statistical reports. The analysis of the switch connection rate is also applicable to other types of switches.
Wang Xi graduated from the Electronic Engineering Department of Chengdu University of Electronic Science and Technology in 1998 and currently serves as the Deputy Director of the Exchange Department of the Chengdu Communication Engineering Bureau. After graduation, he has been engaged in the implementation of engineering projects such as software and hardware testing of mobile communication equipment and network optimization. A variety of mobile core network equipment has a deep grasp and application, has completed many mobile communication projects at home and abroad, and has rich experience in mobile communication core network.
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