GSM-華為-TBF與TCH均擁塞情況下提高TBF建立成功率案例報(bào)告

1、tbf與tch均擁塞情況下提高tbf建立成功率案例報(bào)告產(chǎn)品線gsm更新日期2011-3-16佛山聯(lián)通設(shè)備廠家華為撰寫人陳同雍審核技術(shù)部一、案例事件描述案例描述:獅山軟件d2的gprs下行擁塞率和egprs下行擁塞率指標(biāo)很差，導(dǎo)致 tbf建立成功率也比較差，但是現(xiàn)場(chǎng)基站配置已經(jīng)很大，擴(kuò)容比較困難，同吋語音業(yè) 務(wù)話務(wù)量也比較高。二、案例分析案例分析：數(shù)據(jù)業(yè)務(wù)和語音業(yè)務(wù)都比較擁塞，犧牲話音信道提升數(shù)據(jù)性能行不通， 只能通過調(diào)整數(shù)據(jù)業(yè)務(wù)的參數(shù)改善性能。優(yōu)先使用參數(shù)：下行tbf延時(shí)釋放時(shí)長（毫秒）; 下行tbf延時(shí)釋放時(shí)長（亳秒）：參數(shù)用于設(shè)置下行tbf延遲釋放的時(shí)間；具體含義如 下：在網(wǎng)絡(luò)側(cè)發(fā)送完最后

2、一個(gè)下行rlc數(shù)據(jù)塊，并檢査之前所有發(fā)送的下行數(shù)據(jù)塊都 確認(rèn)收齊z后，不立即通知ms結(jié)束該下行tbf,而是強(qiáng)行設(shè)置最后一個(gè)數(shù)據(jù)塊為未接 收到，不斷重發(fā)值rrbp標(biāo)志的最后一個(gè)數(shù)據(jù)塊，維持下行tbf不被釋放。在下行延 遲釋放過程屮，只要網(wǎng)絡(luò)側(cè)上層有下行數(shù)據(jù)傳輸?shù)囊?，則完成解包的下行rlc塊將 直接可以在該延遲釋放的下行tbf中被發(fā)送，而此時(shí)該下行tbf也從延遲釋放的狀態(tài) 重新變成了下行的傳輸狀態(tài)；另外，由于在維持下行tbf不釋放的過程中，ms必須通 過在rrbp對(duì)應(yīng)的上行數(shù)據(jù)塊上響應(yīng)packet downlink ack/nack消息來保持和網(wǎng)絡(luò)側(cè)的 交互，因此一旦ms有上行數(shù)據(jù)傳輸?shù)男枨?，m

3、s可以立即通過在packet downlink ack/nack 消息中附帶 channel request decription 來向網(wǎng)絡(luò)側(cè)發(fā)出上行 信道請(qǐng)求。三、優(yōu)化措施、建議及實(shí)施過程處理過程：將該小區(qū)的該參數(shù)下行tbf延時(shí)釋放時(shí)長（毫秒）現(xiàn)網(wǎng)設(shè)置為2400,將該 參數(shù)調(diào)整為為1200。這樣，沒有數(shù)據(jù)傳送的時(shí)候，tbf將會(huì)早點(diǎn)釋放，從而就會(huì)有較 多的pdch信道出來，滿足更多用戶的接入需求。!1!實(shí)施后的結(jié)論指標(biāo)對(duì)比：23號(hào)下午5點(diǎn)對(duì)該小區(qū)參數(shù)調(diào)整，擁塞都有所下降，下行tbf擁塞率 從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 較明顯，從89.1

4、8%±升到97.27%,具體指標(biāo)對(duì)比如下：起始時(shí)間對(duì)象名稱上行tbf擁塞率上行tbf建立成 功率下行tbf擁塞率下行tbf建立成功率22/02/2011 12:00:00獅山軟d20.24%96.95%11.80%83.80%22/02/2011 13:00:00獅山軟d20.19%97.53%5.20%91.78%22/02/2011 14:00:00獅山軟d20.66%96.39%13.29%82.60%22/02/2011 15:00:00獅山軟d20.02%97.10%2.19%93.85%22/02/2011 16:00:00獅山軟d20.00%97.33%0.49%96.

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

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

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

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

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

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