Abstract: The 5G-R roaming mobile subscribers can forward service data by using the Local Breakout mode of visiting places, which can greatly reduce the end-to-end time delay of voice, data and video services. Examining how 5G-R roaming subscribers discover and use various MCX service resources in the visiting place, this paper studies and analyzes such processes as service discovery, registration and deregistration, individual call and group call from the perspective of context session management. It also gives feasible implementation suggestions by comprehensively comparing the advantages and disadvantages of the roaming switch mechanism and single/double session mechanism in different scenarios.

Key words: roaming switch, MCX, service discovery, session management, authentication registration

摘要： 5G-R移动用户漫游后，使用拜访地本地疏导的模式进行业务数据的转发，可大幅减少语音、数据、视频等业务的端到端时延。针对5G-R漫游用户如何发现和使用拜访地的各种MCX服务资源的问题，从上下文会话管理的角度，对服务发现、注册注销、单呼业务、组呼业务等流程进行研究和分析，通过综合对比不同场景的漫游切换机制以及单/双会话机制的优劣势情况，给出可行的方案建议。

关键词: 漫游切换, 宽带集群, 服务发现, 会话管理, 认证注册