This document provides solutions for code congestion in mobile networks. It recommends checking certain counters to detect code congestion and expanding to two carriers if congestion is severe in a single carrier cell. The document also recommends using a Load-based Dynamic Rate (LDR) algorithm to solve code congestion. It provides the specific MML configuration to switch on LDR and set the LDR actions, and lists counters that can be monitored to check the effect of the LDR actions.

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Solution for code congestion
Summary
Code congestion will cause low CSSR of both CS and PS service.
We can check counters as below to find code congestion:
VS.RRC.Rej.Code.Cong+VS.RAB.FailEstCs.Code.Cong+VS.RAB.FailEstPs.Code.Cong+VS.RAC.SHO.Fail.O
VSF.Cong+VS.RAC.DCCC.Fail.OVSF.Cong+VS.RAC.HHO.CodeAssignRej.DL
Solution
Code congestion will happen in single carrier cell or F1 cell. If single carrier cell
experience very serious code congestion, expanding 2 carriers is recommended.
To solve code congestion, we recommend using LDR algorithm also. The MML
configuration is as follows:
Switch on the LDR switch:
MOD CELLALGOSWITCH: CellId=0, NBMLdcAlgoSwitch= CELL_CODE_LDR -1;
Setting LDR action:
MOD CELLLDR: CellId=0, DLLDRFIRSTACTION=CodeAdj, DLLDRSECONDACTION=BERateRed,
DlLdrBERateReductionRabNum=1, GoldUserLoadControlSwitch=ON;
Then we can monitor the counters as follows to check the effect of LDR action:
VS.LCC.LDR.BERateDL
VS.LCC.LDR.CodeAdj
VS.LCC.LDR.CodeAdj.Succ
2014-5-18 华为机密，未经许可不得扩散 第 1 页, 共 1 页