Network Relay Authorization for Remote Multicast-Broadcast Access
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Solution Overview
Problem
Some wireless transmit/receive units (WTRUs) in 5G/NR communication systems may not have direct access to multicast-broadcast services, necessitating systems and methods to enable and facilitate such services.
Innovation Solution
A first WTRU operates as a network relay for a second WTRU, requesting multicast group authorization on behalf of the second WTRU, receiving authorization responses, and forwarding multicast information, while creating or modifying quality of service (QoS) flows for the PC5 interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a WTRU operates as a network relay for another WTRU to enable multicast-broadcast service access, then service availability is improved, but device complexity increases
Solution Approach 1:
A first WTRU is configured to operate as a network relay for a second WTRU, receiving a first message from the second WTRU indicating that the second WTRU desires to join a multicast group, and sending an MBS authorization request to the network on behalf of the second WTRU. The first WTRU receives a response from the network and sends a second message to the second WTRU indicating authorization status. This intermediary approach enables WTRUs without direct network access to join multicast groups through another WTRU that has network connectivity.
2Adaptability or versatility
If authorization requests are sent on behalf of remote WTRUs through relay WTRUs, then access to multicast groups is enabled, but communication overhead increases
Solution Approach 1:
The relay WTRU performs multiple functions: receiving join requests from remote WTRUs, constructing authorization requests with appropriate identifiers, sending these requests to the network, receiving responses, and forwarding authorization decisions back to the remote WTRUs. This multi-functional approach consolidates what would otherwise require separate direct connections, reducing overall communication overhead in the network.
Data Source
AI summary
Systems, methods, and instrumentalities associated with providing and/or receiving a multicast-broadcast service (MBS) in a wireless communication system are described herein. A network relay may be used to facilitate the provision of the MBS to a remote wireless transmit/receive unit (WTRU). The network relay may request network authorization to join the MBS on behalf of the remote WTRU. The network relay may include an identifier of the remote WTRU and information regarding the multicast group that the remote WTRU desires to join in the authorization request. The network relay may inform the remote WTRU about an authorization response received from the network, and may forward MBS traffic to the remote WTRU if authorization is granted. The network relay may broadcast an MBS relay support indication to one or more remote WTRUs. The network relay may receive a group paging monitor request from a remote WTRU and may monitor group paging messages for the remote WTRU in response.