电信网络性能质量测量

电信网络性能质量测量

 

 

作者：千里孤行(http://blog.youkuaiyun.com/yanghehong)

 

 

为什么要有质量和性能的测量

 

• 验证系统架构，配置

• 定位已有问题

• 及早发现潜在问题

• 为系统架构演进提供数据支持

 

 

 

 

 服务质量的四个视角

 

 

 

 

 

 

 

服务质量的网络部分和非网络部分

 

 

 

 

从网络角度出发， QoS也受端到端的各个网络和部件影响

 

 

 

测量面向的用户群

 

测量的指标，需要考虑到测量面向的各个用户群。3GPP列举了几个不同方面的用户群，基本上从客户层面到研发层面都有涉及：

 

1. Network Operator's Business Community
-     to guarantee the financial health and welfare of the Operating Company.

2. Network Operator's Maintenance Community
-  to reduce Mean Time to Repair faults that occur within the network equipment of the Operating Company

3. Network Operator's Traffic Engineering Community
- keep the capacity of the network equipment within 1) the Operating Company's design criteria for the quality of service based on growth of the subscriber base, 2) changes in usage patterns based on pricing strategies and 3) introduction of new services.

4. Network Operator's Customer Care Community
- I nterfacing with the end-user customers of offered services for the purpose of establishing and maintaining end-user customer satisfaction.

5. Equipment Vendor's Performance Modelling Community
- to guarantee that the models used during analysis and design phases conform to real-world observations of the network equipment of the Operating Company.

6. Equipment Vendor's Development Engineering Community
- to guarantee that the implementations of the designs conform to real-world observations of the network equipment of the Operating Company.

 

 

 

固定电话网

 

  

• 用户相关的质量衡量参数：

 

 

 

 

 

 

呼叫失败率(Unsuccessful call Ratio)
呼叫建立时间(Call set up time)
语音连接质量(Speech connection quality)	用 E-Model 计算。
传真连接质量(Fax connection quality)	% successful fax transactions

 手机网络基本测量

 

 

Ø 过程尝试次数

     Attempted RRC connection establishments

 

Ø 过程成功次数

     Successful RRC connection establishments

 

Ø 过程失败次数

     Failed RRC connection establishments

 

Ø 过程平均耗时

     RRC connection set-up time (Mean)

 

Ø 过程最高耗时

     RRC connection set-up time (Max)

 

Ø 接口 / 链路收发消息个数和字节数

        Number of BICC messages received on Nc interface 

        Number of octets of BICC message sent on Nc interface

 

 手机网络KPI

3GPP主要从以下几个方面对3G/2G手机网络定义KPI：

• Accessibility ( 服务可及性 )

• Retainability ( 可保持性 )

• Integrity( 完整性 )

• Availability ( 无线网络可用 )

• Mobility( 移动性 )

• Utilization( 利用率 )

 

手机网络(UMTS, GSM) KPI

 

Category	KPI
Accessibility	RAB Establishment Success Rate  RAB Establishment Success Rate for Speech  RAB Establishment Success Rate for Videotelephony  RRC Connection Establishment Success Rate  UTRAN Service Access Success Rate  GERAN Service Access Success Rate for CS Domain  GSM PDP Context Activation Success Rate  UMTS PDP Context Activation Success Rate  UMTS Switched Call Success Rate
Retainability	RAB Abnormal Release Rate  GERAN Service Abnormal Release Rate  Combined 2G 3G Call Drop Ratio
Mobility	Soft Handover Success Rate  Outgoing Intra-system Hard Handover Success Rate  Outgoing Inter RAT Handover Success Rate for CS Domain  Outgoing Inter RAT Handover Success Rate for PS Domain  Handover Success Rate (BSC and Cell)
Utilization	Percentage of Established RABs, CS Speech.  Percentage of Established RABs, CS 64kbps (Videotelephony)  Percentage of Established RABs, TotalPS
Availability	UTRAN Cell Availability
Integrity	UL BLER (Uplink Block Error Rate)

 

 

 

 

 

 

 

 

 

 

VoIP

 

 

 

Ø 很多电信级 VoIP 设备都使用 RTP/RTCP

Ø 下面列举了一些 IETF 的 RTCP 标准定义了的语音传输相关测量：

 

– packet count

– octet count

– fraction lost

– cumulative number of packets lost

– interarrival jitter

– delay

 

 

参考文献

 

• 3GPP TS 32.401 Telecommunication management; Performance Management (PM); Concept and requirements

• 3GPP TR  32.814  Telecommunication management; UTRAN and GERAN Key Performance Indicators (KPI)

• 3GPP TS  32.450 Telecommunication management; Key Performance Indicators (KPI) for Evolved Universal Terrestrial Radio Access Network (E-UTRAN): Definitions

• ITU-T E.800  Definitions of terms related to quality of service

• ITU-T G.1000  Communications Quality of Service A framework and definitions

• EG 202 057-2  User related QoS parameter definitions and measurements; Part 2: Voice telephony, Group 3 fax, modem data services and SMS

• 3GPP TS  32410-900 Telecommunication management; Key Performance Indicators (KPI) for UMTS and GSM

• 3GPP TS  32.450  Telecommunication management; Key Performance Indicators (KPI) for Evolved Universal Terrestrial Radio Access Network (E-UTRAN): Definitions

• 3GPP TS 32451 Telecommunication management; Key Performance Indicators (KPI) for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Requirements

• RFC 3550  RTP  A Transport Protocol for Real-Time Applications