MBS Network Relay Authorization for Remote WTRU Multicast 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 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 access multicast-broadcast services, then WTRUs without direct network access can join multicast groups, but the device complexity and authorization management overhead increase
Solution Approach 1:
A WTRU acting as a network relay serves as an intermediary between WTRUs without direct network access and the core network. The relay WTRU receives multicast service requests from remote WTRUs, formulates authorization requests on their behalf, and forwards received multicast data to the remote WTRUs. This intermediary approach enables indirect access while maintaining standardized interface protocols to manage complexity.
Solution Approach 2:
The relay WTRU performs multiple functions: it acts as a regular WTRU receiving multicast services, simultaneously serves as a network access point for other WTRUs, manages authorization requests for multiple clients, and forwards data packets. This multi-functionality allows a single device to enable multicast access for multiple WTRUs without requiring separate infrastructure for each.
2Ease of operation
If the first WTRU sends authorization requests on behalf of the second WTRU, then the second WTRU can access multicast services without direct network connection, but the communication overhead and signaling complexity increase
Solution Approach 1:
The relay WTRU creates a copy of the authorization request message format used in direct WTRU-network communication, adapting it for relayed communication. It includes the remote WTRU's identifier and multicast service information in the authorization request sent to the network, enabling the network to process the request as if it originated directly from the remote WTRU while allowing the relay to represent it.
3Reliability
If QoS flows are created or modified for the PC5 interface based on multicast information, then quality of service is ensured for relayed multicast traffic, but the processing complexity and resource management overhead increase
Solution Approach 1:
The relay WTRU creates or modifies QoS flows specifically for the PC5 interface that connects to remote WTRUs, tailoring the quality parameters to the multicast traffic requirements. This local QoS management ensures that multicast traffic receives appropriate resource allocation and priority handling on the relay link without affecting other communication interfaces or services.
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.