Page 1421 - 5G Basics - Core Network Aspects
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Signalling aspects 3
Appendix I
An example of SBAN
(This appendix does not form an integral part of this Recommendation.)
IP RAN is based on IP/multi-protocol label switching (MPLS) technology framework, through enhanced
operation, administration and maintenance (OAM), protection, clock, network management and other
capabilities, to meet the needs of wireless, access and other integrated services.
Compared with other IP network, IP RAN has the following characteristics:
1) IP RAN has only two kinds of topology: ring or chain structure. In most cases, it will be ring structure
due to network robustness;
2) An access node only belongs to a ring or a chain;
3) One endpoint of the flow in the IP RAN is an access port, the other side is an aggregate port or an
access port in the same ring or the same chain;
4) Based on the ring structure, the work and backup path of each flow have only two options: clockwise
or counter clockwise.
Each ring or chain can be abstracted into a simple virtual switch which composed of access ports and
aggregate ports, without considering the specific path.
In software-defined IP RAN, each ring or chain can be abstracted into a virtual SDN switch composed of access
ports and aggregate ports, which is called SBAN node and depicted in Figure I.1.
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