核心网中不同语音编码传送以及带宽计算(客服系统呼叫中心参考)

1、HUAWEI CVoIP Bandwidth Calculation of FE InterfaceNBUPRTPUDPIPEthernet4 byte12 bytes8 bytes20 bytes26 bytesCodec typePackage intervalNet voiceVoice codec speedG.71120 ms160 bytes64 kbpsG.72920 ms20 bytes8 kbpsAMR 12.220 ms31 bytes12.2 kbpsInformation of G.711, G.729 and AMRG.711： (160+4+26+20+8+12)*

2、8/0.02 = 92.00 kbpsG.729： (20+4+26+20+8+12)*8/0.02 = 36.00 kbpsAMR12.2: (31+4 +26+20+8+12)*8/0.02 = 40.40 kbpsIf combined with VAD about 50% bandwidth will be saved Bandwidth calculation basing on FE interfaceTransmission model basing on FE portsHUAWEI CVoIP Bandwidth Calculation of POS InterfaceCod

3、ec typePackage intervalNet voiceVoice codec speedG.71120 ms160 bytes64 kbpsG.72920 ms20 bytes8 kbpsAMR12.220 ms31 bytes12.2 kbpsInformation of G.711, G.729 and AMRG.711： (160+4+12+8+20+9)*8/0.02 = 85.20 kbpsG.729： (20+4+12+8+20+9)*8/0.02 = 29.20 kbpsAMR12.2: (31+4+12+8+20+9)*8/0.02 = 33.60 kbpsIf co

4、mbined with VAD about 50% bandwidth will be saved Bandwidth calculation basing on POS interfaceTransmission model basing on POS portsNBUPRTPUDPIPPPP4 bytes12 bytes8 bytes20 bytes9 bytesHUAWEI CVOIP Solution for G/TMSCBeijing XianGuangzhouShenyangShanghai WuhanChenduNanjingTraditional solution for G/

5、TMSCHuawei Softswitch VOIP solution for G/TMSCEach voice channel occupy 64K bps.Combined with VAD and G.711/G.729 dynamic conversion, basing on POS and FE interface, in average one call occupies 27.0K bps.l Using tradition solution it will need 94,815 E1. l According to Huawei Softswitch MSC, the to

6、tal 40,000 E1 have been used. l In China, the rent charge for one E1 are approximately 2000 RMB per month for intra-province transmission, and 15000 RMB per month for inter-province transmission.VOIP solution can help CMCC save :（94,815E140,000E1）*15,000 822,225,000 RMB （99,422,612 USD）per month, l

7、99,422,612 USD*12= 1,193,071,344 USD per year.HUAWEI CTraditional Solution for VMSCBasic Traffic model:If the BSC support 100 K mobile subscribers, acording to erl table it will need 2526 E (82 E1), so in traditional solution it will need 130 E1 for long distance transmission : PSTN-MSC: 2526*30%+25

8、26 *30%=1516 E ( 48 E1) BSC-MSC: 2526 E (82 E1)BSCMSCSmall cityLarge cityPSTNBSCPSTNTraditional solution for VMSCl30% MS To PSTN l30% PSTN To MSl40% MS-MS l80% Local terminationl0.025 erl / subs,lAverage holding time: 60slGOS: 0.01HUAWEI CLocal Call Local Switching solution for VMSC If the BSC suppo

9、rt 100 K mobile subscribers, acording to erl table it will need 2526 E (82 E1) In softswitch local call local switching solution it will need 7 E1 for long distance transmission : PSTN-MSC: 0 BSC-MSC: 2526 *40%*(1-80%)=203E (7 E1) Combined with AMR 12.2 basing on FE interface and VAD technology, one

10、 call occupies 20.2 kbps, it will only need 3 E1. PSTN-MSC: 0 BSC-MSC : 203/3=67 E (3 E1) LCLS Solution for VMSCl 30% MS To PSTN l 30% PSTN To MSl 40% MS-MS l 80% Local terminationl 0.025 erl / subs,l Average holding time: 60sl GOS: 0.01Basic Traffic model:MSCServerBSCSmall cityLarge cityPSTNBSCPSTN

11、MGWTDM/IPHuawei confidentialHUAWEI移动软交换技术专题移动软交换技术专题u 移动软交换的演进移动软交换的演进u 软交换协议介绍软交换协议介绍u VOIP技术以及编解码技术技术以及编解码技术u 移动软交换可靠性解决方案移动软交换可靠性解决方案u QOS和和IP网络安全网络安全u MNP和和MVNO解决方案解决方案u SOSM监听解决方案监听解决方案Huawei confidentialHUAWEIMSC Server 1MSC Server 2IP BackboneLocal PLMNLocal PLMNLocal PLMNLocal PLMNLocal PLMN

12、MGWMGWMGWMGWMGW支持IP承载语音，包括G.711/G.729/G.723/AMR 等多种语音编码方式支持静音检测技术VAD优点： IP扁平组网 至少节省50%的传输带宽VOIP移动软交换组网优势移动软交换组网优势Huawei confidentialHUAWEI2G 编解码编解码- RPE-LTPHuawei confidentialHUAWEI3G 编解码编解码Huawei confidentialHUAWEI2G 编解码编解码 -AMRChannelSource codec bit-rateTCH/AFS12.2 kbit/s (GSM EFR)10.2 kbit/s7.95

13、 kbit/s7.40 kbit/s6.70 kbit/s5.90 kbit/s5.15 kbit/s4.75 kbit/sTCH/AHS7.95 kbit/s7.40 kbit/s6.70 kbit/s5.90 kbit/s5.15 kbit/s4.75 kbit/sHuawei confidentialHUAWEI3G ARM 编解码（端到端的编码方案）编解码（端到端的编码方案） AMR 3GPP_R99 协议规定 采用13bit对语音进行每秒8000次的采样（20ms为160个语音包），用ACELP对语音进行编码，支持下面速率：12.2,10.2,7.95,7.4,6.7,5.9,5.1

14、5,4.75,和AMR_SID 1.8 AMR_WB3GPP_R5 协议规定用14bit对语音进行每秒16000次采样（20ms为320个语音包），用ACELP对语音进行编码为，支持下面速率：23.85,23.05,19.85,18.25,15.85,14.25,12.65,8.85,6.60和AMR_WB_SID 1.75 kbpsAMR_WB 采用更高的速率和采用率，语音质量更好，但需要有更高的处理能力（华为2006Q4提供）Huawei confidentialHUAWEI核心承载网带宽的计算核心承载网带宽的计算IP包承载在包承载在FE口口承载在FE口协议模型编解码编解码净荷净荷IP包长

15、包长EHERNET包长包长IP速率速率kbpsETHERNET速率速率kbps有有VAD速率速率kbpsAMR 12.2 20ms31475101123040.420.2AMR 4.75 20ms12456821222.432.816.464K数据业务数据业务 5ms4048411012134.4176NBUPRTPUDPIPETHERNET4bytes12bytes8bytes20bytes26bytesNBUP头可以看做净荷，ETHERNET帧间有间隙，为12byte (31+4+12+8+20)*8/0.02=30KBPS(31+4+12+8+20+26)*8/0.02=40.4KBPS

16、如果每用户0.025erl，有VAD情况下每 1 万用户占有带宽为0.0251000020.2kbps5.05 M 承载在FE口带宽速率Huawei confidentialHUAWEI核心承载网带宽的计算核心承载网带宽的计算IP包承载在包承载在POS口口承载在POS口时采用PPP协议封装（STM-1 SDH）编解码编解码净荷净荷IP包长包长PPP包长包长IP速率速率kbpsPPP速率速率kbps有有VAD速率速率kbpsAMR 12.2 20ms31475843033.616.8AMR 4.75 20ms124566522.4261364K数据业务数据业务 5ms4048493134.414

17、8.8NBUPRTPUDPIPPPP4bytes12bytes8bytes20bytes9bytesNBUP头可以看做净荷头可以看做净荷(31+4+12+8+20)*8/0.02=30KBPS(31+4+12+8+20+9)*8/0.02=33.6KBPS如果每用户0.025erl，有VAD情况下每 1 万用户占有带宽为0.0251000016.8kbps4.2 M G.711净荷为净荷为 160 bytes ，G.729净荷为净荷为 20 bytesHuawei confidentialHUAWEITrFO Transcoder Free OperationMSC serverMGWMSC

18、serverMGWAMR VoiceAMR Voice节省了TC资源的介入及带来的话质损失AMR VoiceAMR VoiceG.711 VoiceAMR VoiceR4阶段基于，话音可以在ATM/IP分组网络上承载，开放TrFO功能，使得3G用户间的通话可以不必经过语音编解码变换器的有损变换处理，最终语音质量得以提高；在分组网上传输AMR压缩语音及VAD技术的应用，能节省2/3以上的传输带宽。Huawei confidentialHUAWEITrFO for 3G-3GMSOFTXUMGMSOFTXUMGRNCRNCIP BackboneH.248H.248BICCIUIUNbNbNode

19、BNode BMSSelected Codec=AMREnd to End AMR without transcoderAMR/NbUP/RTP/UDP/IPAMR/IUUP/AAL2/ATMAMR/IUUP/AAL2/ATMAMR/RLC/MAC/.AMR/RLC/MAC/.Huawei confidentialHUAWEITrFO for 3G-2GMSOFTXUMGMSOFTXUMGRNCBSCIP BackboneH.248H.248BICCIUANbNbNode BBTSMSSelected CodeC = AMRAMR to the EDGE of Core networkAMR/

20、NbUP/RTP/UDP/IPAMR/IUUP/AAL2/ATMG.711/TDMAMR/RLC/MAC/.FR/RLC/MAC/.MS FR/EFR/HR in BSSHuawei confidentialHUAWEITrFO的实现的实现-带外的带外的TC协商机制协商机制TransitNetworkRNCMSCServerMGWMSCServerMGWRNCRANAPRANAPMGwControlMGwControlOoB CodecNegotiationControlPlaneUserPlaneRadio BearerIu BearerCN bearerIu BearerRadio Bea

21、rerEnd to end connectionBearer ReqBearer ReqBearer ReqMEMEOoB CodecNegotiationOoB CodecNegotiationHuawei confidentialHUAWEI动态选择动态选择codec选择选择 2G-2G(带外协商带外协商)MSOFTXUMGMSOFTXUMGBSCBSCIP BackboneH.248H.248BICCAANbNbBTSBTSMSSelected CodeC = G.711G.711/RTP/UDP/IPG.711/TDMG.711/TDMFR/RLC/MAC/.FR/RLC/MAC/.M

22、SOFTXUMGMSOFTXUMGBSCBSCIP BackboneH.248H.248BICCAANbNbBTSBTSMSSelected Codec = AMRAMR/NbUP/RTP/UDP/IPG.711/TDMG.711/TDMFR/RLC/MAC/.FR/RLC/MAC/.Huawei confidentialHUAWEI动态编解码选择动态编解码选择UMG8900UMG8900IP NetworkSERVER根据承载网带宽情况选择合适的编解码来保证总体的QOS如果带宽足够选择G.711，不够则选择G.729DestinationDestinationHuawei confidentialHUAWEI核心网承载核心网承载QOS流控流控MSOFTX3000Sample requestLSPLSPLSPLSPLSPTraffic flowcall admission controlSample responseMSOFTX3000n 在MGW对间维持采样呼叫，监控承载质量n 通过采用呼叫上报的承载质量进行呼叫接入控制n UMG自动监控QOS质量，并实时上报给SERVERn 中国移动T项目已经应用Huawei confident