面向5G承载的IP RAN演进及关键技术

doi:10.11959/j.issn.1000-0801.2020001

Abstract

Abstract:

IP RAN need to adapt to the changes of 5G network architecture to meet the differentiated bearing requirements of eMBB,uRLLC and mMTC services defined by 5G.The network capabilities of “large bandwidth,low latency,flexible connection” are the basic requirements of IP RAN for 5G bearer.Firstly,the characteristics of 5G services and network architecture were analyzed,and the 5G-oriented IP RAN evolution scheme was proposed.Then,the key technologies of 5G-beared IP RAN were investigated and tested to provide support and suggestions for large-scale commercial deployment of 5G.

Key words: 5G bearer, IP RAN, SR, EVPN, network slicing

CLC Number:

TN915.41

Xiaoming HE,Ping YUE,Quan LU,Yuanyang YIN. Evolution and key technologies of 5G-oriented IP RAN[J]. Telecommunications Science, 2020, 36(3): 125-135.

Figures/Tables 10

References 24

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BGP标签分发	标签生成	标签分发协议	域间出口选择	可维护性
BGP-EPE	BGP peering SID可固定分配，也可随机生成	不需要	可根据路径策略灵活选择	标签可见，方便维护
BGP-LU	远端PE绑定标签SID只能随机生成	BGP	根据BGP路径属性决定	标签不可见，难以维护
BGP-SR	远端PE绑定标签SID可全局规划，全网唯一	BGP	根据BGP路径属性决定	标签全网统一，方便维护

路由类型	名称	作用
RT-1	以太网自动发现路由（ethernet auto-discovery route）	CE多归属场景下通告以太网段标识（ethernet segment identifier，ESI），可用于L2VPN的负载均衡、路径冗余备份、快速收敛
RT-2	MAC/IP通告路由（MAC/IP advertisement route）	MAC、ARP及主机路由信息的通告，可用于VPLS、VxLAN等场景
RT-3	泛多播以太网标签路由（inclusive multicast Ethernet tag route）	通告泛多播以太网路由，主要用于未知单播、多播及广播报文处理
RT-4	以太网段路由（ethernet segment route）	通告ESI及源路由器IP地址信息，用于CE多归属场景下指定转发器（designated forwarder，DF）选举
RT-5	IP地址前缀路由（IP prefix route）	通告IP地址前缀信息，可用于VxLAN子网间路由、L3VPN

测试项目	测试结果
SR-BE、SR-TE	设备支持10层标签栈能力；支持严格SR-TE和松散SR-TE；支持标签粘连
OAM（SR-ping、SR-trace、SR-BFD）	支持
LDP与SR共存	支持设备同时开启LDP、SR
LDP与SR互操作	支持LDP?SR互操作
PW+L3VPN	支持PW+L3VPN over LDP和PW+L3VPN over SR-BE/TE
层次化HOVPN	支持HOVPN over LDP、HOVPN over SR-BE/TE，支持3层到边缘
6VPE	支持L3VPN over LDP/SR-BE/SR-TE，支持PW+L3VPN和HOVPN
SR-BE TI-LFA FRR	支持
SR-TE热备份	支持
EVPN	支持L2VPN（VPWS、VPLS）、L3VPN，支持L2/3 VPN统一控制，支持ARP代理，支持single-active冗余及all-active负载均衡
FlexE	支持50GE/100GE FlexE接口通道化子速率，支持FlexE客户端带宽动态调整，支持L2/3 VPN over LDP/SR over FlexE

Evolution and key technologies of 5G-oriented IP RAN

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