Guide to Troubleshooting High ZXG10-BSS-TCH Allocation Failure RateZTE Corporation

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PrefaceContents1Chapter 1 Guide to Troubleshooting High ZXG10-BSS-TCH Allocation Failure Rate

11.1 Analysis of High TCH Allocation Failure Rate Cases

11.1.1 High TCH Allocation Rate in Many Indian Cells

Chapter 1 Guide to Troubleshooting High ZXG10-BSS-TCH Allocation Failure Rate1.1 Analysis of High TCH Allocation Failure Rate Cases1.1.1 High TCH Allocation Rate in Many Indian CellsFault Description: As shown in Table 1, the TCH allocation failure rate of this cell is high.Table 1 Cell Information

11653(Number of TCH/F Allocation Successful (exclude handover))11654(Number of TCH/F Allocation Failure (exclude handover))11655(Number of TCH/F Allocation Successful (include handover))11656(Number of TCH/F Allocation Failure (include handover))

4135752474

4535658370

460111567143

39975527106

395852013

4143951254

4093153538

48392586116

4622058931

4284055751

Fault analysis: 1Signaling analysis:

Figure 1 Signaling Analysis

Figure 1 shows that the allocation failure starts when activating TCH, and such a flow is the initial flow of the object cell during the handover procedure.

After the channel activation starting, it is timeout that causes the channel activation to fail, which indicates that MS doesnt handover to the cell and the handover is a mistaken one. It requires checking data configuration for cases with same frequency and same BISC2Printing analysis:

There is much printed information as follows:

ServUp line 1269: Timer out at UL Assign status. InstNo is: 1148.Site 29,Bts 1,Trx 1

It indicates that uplink timeout occurs during channel allocation.

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