纲要移动网络结构与网元设备高可用性在移动网络设备中的含义高可用性平台的设计 n 系统冗余备份模型 n 内部消息的冗余机制 n 网络与传输 n 存储系统 n 过载保护与残留资源的清理 n 系统升级

Size: px

Start display at page:

Download "纲要移动网络结构与网元设备高可用性在移动网络设备中的含义高可用性平台的设计 n 系统冗余备份模型 n 内部消息的冗余机制 n 网络与传输 n 存储系统 n 过载保护与残留资源的清理 n 系统升级"

钿梢僪
6 years ago
Views:

1 移动通信网络设备的高可用性平台设计李程远

2 纲要移动网络结构与网元设备高可用性在移动网络设备中的含义高可用性平台的设计 n 系统冗余备份模型 n 内部消息的冗余机制 n 网络与传输 n 存储系统 n 过载保护与残留资源的清理 n 系统升级

3 移动网络结构与网元设备

4 移动网络结构 3G RAN Iu-CS Mc Iu-PS Ater ATM/IP backbone Iub BTS Nb Mb Mg Mc Mc 2G BSS Abis PSTN CN Gn CS-CN PS-CN Iur RNS BTS SGSN A Ater TC BSC Gm Nc RAN PSTN MSS/ GCS CPS GGSN MSC Server BTS BTS BSS RNC RNC MGW MGW MGW

5 3GPP 用户平面与控制平面的协议栈 Iur User Plane Iur FP Iur Control Plane RNSAP SCCP M3UA Iub User Plane Iub Control Plane UDP IP SCTP Transport Network Layer Transport Network Layer Iub FP UDP IP Data Link NBAP SCTP Application Data Link Iur Iu User Plane Iu UP Iu Control Plane RANAP Iub GTP RTP/ RTCP SCCP M3UA UDP IP SCTP Transport Network Layer Data Link Iu

6 相关术语解释 n NE (Network Element, 网元 ) According to Telecommunications Act of 1996, the term `network element' means a facility or equipment used in the provision of a telecommunications service. Such term also includes features, functions, and capabilities that are provided by means of such facility or equipment, including subscriber numbers, databases, signaling systems, and information sufficient for billing and collection or used in the transmission, routing, or other provision of a telecommunications service. n UE (User Equipment, 用户设备 ) UE is any device used directly by an end-user to communicate. It can be a hand-held telephone, a laptop computer equipped with a mobile broadband adapter, or any other device n RAN (Radio Access Network, 无线接入网 ) Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). RAN types: GRAN (GSM RAN), UTRAN (UMTS RAN). n CN (Core Network, 核心网 ) It is the central part of a telecommunication network that provides various services to customers who are connected by the access network. One of the main functions is to route telephone calls across the PSTN.

7 相关术语解释 n Interfaces n Uu, The radio interface between the UE and the BTS. n Iub, The interface between BTS and RNC. n Iu, The interface connects RAN and CN n n Iu-CS, Iu interface Circuit Switched n Iu-PS, Iu interface Packet Switched Iur, The interface between RNCs, for soft handover. n User Plane ( 用户平面 ) All information sent and received by the user, such as the coded voice in a voice call or the packets in an Internet connection, are transported via the User Plane. n Control Plane ( 控制平面 ) It s for all control signalling, includes the application protocol (e.g. RANAP in Iu, RNSAP in Iur and NBAP in Iub), and the signalling bearer for transporting the application protocol messages. n Management Plane ( 管理平面 ) The management plane carries the operations and administration traffic required for network management.

8 Network Element Cabinet / rack Subrack 1800 (2200) Plug-in unit

9 Advanced Telecom Computing Architecture

10 Rack-mount Box

11 一个网元中不同的功能模块 CCU SPU UserPlane Unit... CCU SPU UserPlane Unit... Inter-processor switch Inter-processor switch UserPlane SPU... Unit UserPlane SPU... Unit MU UserPlane Unit UserPlane Unit... MU UserPlane Unit UserPlane Unit... Inter-processor switch Inter-processor switch Tran Unit Tran Unit Tran Unit Tran Unit Iub Iu Iub Iu

12 User Plane Traffic Signaling Traffic UPU (DSP or SE Node) RRC SPU (Linux Node) RLC IU UP MAC RANAP NBAP FP IPC IPC IPC IPC SCCP M3UA RTP GTP SCTP UDP SCTP UDP IP/IPSec Tran Unit (Linux Node + HW Accelerate) IP/IPSec Tran Unit (Linux Node + HW Accelerate) Iu Iub

13 高可用性在移动网络设备中的含义

14 五个九的要求 n MTTF/MTBF = MTTF/(MTTF + MTTR) = % 一年中停机时间最多 5 分 15 秒

15 不同服务的可用性 n 用户平面 n 控制平面 n 管理平面

16 高可用性平台的设计

17 系统冗余备份模型 1 Cluster * Node 1 1..* Service Group 1 0..* Proxied Component 0..* 1..* Service Unit 1 1..* 1..* 1 Process

18 系统冗余备份模型 n SG(Service Group) Redundance Model n 2N n Active/Hot Standby. n N+M n Active/Cold Standby n N-Way Active n Active, Loadsharing n No Redundancy

19 n State Model (ITU-T X.731) n n n Administrative State n Locked/Unlocked/ Shutting Down. Operational State n Enable/Disable Usage State n Idle/Active/Busy

20 系统冗余备份模型 Node_0 Node_1 2N Service Group Service Unit 0 (Active) Service Unit 1 (Hot Standby) Disk Resource IP Disk Resource Node_0 Node_1 2N Service Group Service Unit 0 Service Unit 1 (Active) 2N Service Group Disk Resource IP Disk Resource

21 系统冗余备份模型 N+M Service Group Node_0 Node_1 Node_2 Node_3 Node_4 Service Unit 0 (Active) Service Unit 1 (Active) Service Unit 2 (Active) Service Unit 3 (Cold Standby) Service Unit 4 (Cold Standby) N+M Service Group

22 系统冗余备份模型 N-Way Active Service Group Node_0 Node_1 Node_2 Node_3 Node_4 Service Unit 0 (Active) Service Unit 1 (Active) Service Unit 2 (Active) Service Unit 3 (Active) Service Unit 4 (Active) N-Way Active Service Group

23 系统冗余备份模型 No Redundance Service Group Node_0 Node_1 Node_2 Service Unit 0 (Active) No Redundance Service Group 0 Service Unit 0 (Active) No Redundance Service Group 1 Service Unit 0 (Active) No Redundance Service Group 2

24 系统冗余备份模型 n 不同服务使用不同的冗余模型 n 2N n Management Unit, Transport Unit. n N+M n Signaling Processing Unit n N-Way Active n UE Specific Unit. n No Redundancy n User Plane Proxy

25 内部消息的冗余机制 n 内部消息的地址管理 n 对于每个 Service Unit, 同时有两个地址 n 物理地址 n 逻辑地址 n 系统维护物理地址与逻辑地址的映射表 n 当 Service Unit 状态发生变化时更新映射表

26 内部消息的冗余机制 n 消息的输入同步 2N Service Group 1 2N Service Group 2 2N Service Group 1 2N Service Group 2 Service Unit 0 (Active) Service Unit 2 (Active) Service Unit 0 (Active) Service Unit 2 (Active) Service Unit 1 (Hot Standby) Service Unit 3 (Hot Standby) Service Unit 1 (Hot Standby) Service Unit 3 (Hot Standby)

27 内部消息的冗余机制 n 模块的数据同步 n n 数据同步的时机 n n n 2N Service Group n Standby Service Unit 重新启动的时候 ( 通常是在 switchover 之后 ), 从 Active Service Unit 中获取数据 N+M Service Group n 在 control switchover 时, Standby Service Unit 从 Active Service Unit 获取数据, 然后 standby -> Active. 被侦测到失步数据同步的时间 n 服务中断

28 网络与传输 n 网络冗余规划 n 网络接口的冗余 n 用户平面 / 管理平面网络接口 n 控制平面网络接口 n 接口失效检测与切换 n QoS

29 网络与传输用户平面 / 管理平面网络接口 NE Tran Unit 0 Service IP Tran Unit 1

30 网络与传输控制平面网络接口 NE Tran Unit 0 SCTP IP_1 SCTP IP_2 primary path secondary path

31 网络与传输接口失效检测与切换 NE Tran Unit 0 SU Service IP Tran Unit 1 SU Service IP

32 网络与传输接口失效检测与切换接口状态? 网关可达? User Space Tran Unit 0 SU Trigger Switchover Avalability Manager Notification BFD Detector Daemon Netlink MSG route table Kernel eth0 eth1

33 网络与传输 n QoS n 确保高优先级的包先处理 n 入包队列的调度 n 硬件协处理器

34 存储系统 n 硬盘存储的同步 n DRBD (Distributed Replicated Block Device) n DRBD 分区作为 SG 的资源, 始终挂载在 Active SU 所在的 Node. n 数据库的同步 n 例如,PostgreSQL synchronous replication. 数据在 Active 和 Standby Node 之间同步

35 过载保护与残留资源的清理 n 系统过载的原因 n 系统过载保护 n 监控每个节点的 CPU/Memory, n 超限拒绝新请求 n Traffic Ingress QoS n 过载后的资源残留 n 定时同步 user/control/transport 资源, 清理残留

36 系统升级 n 软件升级 n 升级包的最小化 n 配置数据的升级转化 n 单次重起 n 硬件升级 n 硬件冗余, n 控制切换 / 安全关机 n 硬件替换单元

37 谢谢!

PS PS GMM SM.zte.com.

WBUB-010-1 ZXWN PS V0411.zte.com. PS PS GMM SM.zte.com. PS TMSI Packet-Temporary mobile subscriber identification number P-TMSI) GPRS MS P- TMSI 4 BCD 3G TS 23.003 MSC SGSN SGSN P-TMSI 11 MSC TMSI 00 01

纲要 移动网络结构与网元设备 高可用性在移动网络设备中的含义 高可用性平台的设计 n 系统冗余备份模型 n 内部消息的冗余机制 n 网络与传输 n 存储系统 n 过载保护与残留资源的清理 n 系统升级

纲要移动网络结构与网元设备高可用性在移动网络设备中的含义高可用性平台的设计 n 系统冗余备份模型 n 内部消息的冗余机制 n 网络与传输 n 存储系统 n 过载保护与残留资源的清理 n 系统升级