GSM-华为-TBF与TCH均拥塞情况下提高TBF建立成功率案例报告

1、tbf与tch均拥塞情况下提高tbf建立成功率案例报告产品线gsm更新日期2011-3-16佛山联通设备厂家华为撰写人陈同雍审核技术部一、案例事件描述案例描述:狮山软件d2的gprs下行拥塞率和egprs下行拥塞率指标很差，导致 tbf建立成功率也比较差，但是现场基站配置已经很大，扩容比较困难，同吋语音业 务话务量也比较高。二、案例分析案例分析：数据业务和语音业务都比较拥塞，牺牲话音信道提升数据性能行不通， 只能通过调整数据业务的参数改善性能。优先使用参数：下行tbf延时释放时长（毫秒）; 下行tbf延时释放时长（亳秒）：参数用于设置下行tbf延迟释放的时间；具体含义如 下：在网络侧发送完最后

2、一个下行rlc数据块，并检査之前所有发送的下行数据块都 确认收齐z后，不立即通知ms结束该下行tbf,而是强行设置最后一个数据块为未接 收到，不断重发值rrbp标志的最后一个数据块，维持下行tbf不被释放。在下行延 迟释放过程屮，只要网络侧上层有下行数据传输的要求，则完成解包的下行rlc块将 直接可以在该延迟释放的下行tbf中被发送，而此时该下行tbf也从延迟释放的状态 重新变成了下行的传输状态；另外，由于在维持下行tbf不释放的过程中，ms必须通 过在rrbp对应的上行数据块上响应packet downlink ack/nack消息来保持和网络侧的 交互，因此一旦ms有上行数据传输的需求，m

3、s可以立即通过在packet downlink ack/nack 消息中附带 channel request decription 来向网络侧发出上行 信道请求。三、优化措施、建议及实施过程处理过程：将该小区的该参数下行tbf延时释放时长（毫秒）现网设置为2400,将该 参数调整为为1200。这样，没有数据传送的时候，tbf将会早点释放，从而就会有较 多的pdch信道出來，满足更多用户的接入需求。!1!实施后的结论指标对比：23号下午5点对该小区参数调整，拥塞都有所下降，下行tbf拥塞率 从7.76%下降到1.06%,上下行tbf建立成功率都提高，下行tbf建立成功率提升比 较明显，从89.1

4、8%±升到97.27%,具体指标对比如下：起始时间对象名称上行tbf拥塞率上行tbf建立成 功率下行tbf拥塞率下行tbf建立成功率22/02/2011 12:00:00狮山软d20.24%96.95%11.80%83.80%22/02/2011 13:00:00狮山软d20.19%97.53%5.20%91.78%22/02/2011 14:00:00狮山软d20.66%96.39%13.29%82.60%22/02/2011 15:00:00狮山软d20.02%97.10%2.19%93.85%22/02/2011 16:00:00狮山软d20.00%97.33%0.49%96.

5、32%22/02/2011 17:00:00狮山软d20.00%97.67%0.22%96.84%22/02/2011 18:00:00狮山软d20.01%97.89%2.41%94.56%22/02/2011 19:00:00狮山软d20.05%97.23%5.25%91.54%22/02/2011 20:00:00狮山软d20.05%97.29%5.53%91.03%22/02/2011 21:00:00狮山软d20.07%97.74%6.87%90.52%22/02/2011 22:00:00狮山软d20.24%97.41%9.63%86.68%22/02/2011 23:00:00狮山

6、软d20.17%97.41%9.59%86.65%23/02/2011 00:00:00狮山软d20.00%96.96%0.04%96.75%23/02/2011 01:00:00狮山软d20.00%98.16%0.00%98.62%23/02/2011 02:00:00狮山软d20.00%99.03%0.00%99.12%23/02/2011 03:00:00狮山软d20.00%99.63%0.00%99.41%23/02/2011 04:00:00狮山软d20.00%99.41%0.00%99.15%23/02/2011 05:00:00狮山软d20.00%99.09%0.00%98.15

7、%23/02/2011 06:00:00狮山软d20.00%98.72%0.00%98.03%23/02/2011 07:00:00狮山软d20.00%97.80%0.00%97.06%23/02/2011 08:00:00狮山软d20.15%97.53%13.13%83.09%23/02/2011 09:00:00狮山软d20.71%96.06%18.51%77.01%23/02/2011 10:00:00狮山软d25.02%90.79%30.89%64.19%23/02/2011 11:00:00狮山软d24.75%90.57%32.72%60.76%23/02/2011 12:00:00

8、狮山软d21.05%95.32%19.03%77.69%23/02/2011 13:00:00狮山软d20.03%97.57%3.03%93.72%23/02/2011 14:00:00狮山软d20.93%96.27%20.98%76.06%23/02/2011 15:00:00狮山软d20.56%96.84%19.34%78.21%23/02/2011 16:00:00狮山软d20.02%98.22%2.55%95.28%23/02/2011 17:00:00狮山软d20.00%98.11%0.01%97.02%23/02/2011 18:00:00狮山软d20.00%98.36%0.25%

9、98.05%23/02/2011 19:00:00狮山软d20.15%97.99%4.02%93.59%23/02/2011 20:00:00狮山软d20.10%97.80%4.10%94.01%23/02/2011 21:00:00狮山软d20.04%97.90%2.88%95.18%23/02/2011 22:00:00狮山软d20.16%97.64%5.39%92.23%23/02/2011 23:00:00狮山软d20.25%96.97%5.52%92.07%24/02/2011 00:00:00狮山软d20.00%97.81%0.00%98.27%24/02/2011 01:00:0

10、0狮山软d20.00%99.11%0.00%98.86%24/02/2011 02:00:00狮山软d20.00%99.43%0.00%99.20%24/02/2011 03:00:00狮山软d20.00%99.85%0.00%99.76%24/02/2011 04:00:00狮山软d20.00%99.19%0.00%99.64%24/02/2011 05:00:00狮山软d20.00%98.60%0.00%99.36%24/02/2011 06:00:00狮山软d20.00%99.27%0.00%99.41%24/02/2011 07:00:00狮山软d20.00%98.58%0.00%98.79%24/02/2011 08:00:00狮山软d20.00%98.22%0.00%97.98%24/02/2011 09:00:00狮山软d20.00%98.13%0.00%97.97%24/02/2011 10:00:00狮山软d20.00%98.41%0.00%97.71%24/02/2011 11:00:00狮山软d20.00%98.42%0.00%97.53%24/02/2011 12:00:00狮山软d20.00%98.01%0.14%97.51%24/02/