MBS Interest Indication for HARQ Feedback Attribution
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Solution Overview
Problem
In wireless communication systems, particularly for multicast and broadcast services (MBS) in 5G networks, there is a challenge in accurately reporting feedback, such as hybrid automatic repeat request (HARQ) feedback, from user equipment (UE) to the base station, especially when switching between MBS services or consuming multiple services concurrently, leading to potential misattribution of feedback and inefficient resource management.
Innovation Solution
The UE transmits an MBS interest information message to the base station to confirm interest in specific MBS services, ensuring feedback is processed correctly by waiting for a confirmatory message before providing feedback, and implements mechanisms to handle scenarios where multiple services are being received concurrently, including retransmission management and HARQ feedback multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE provides HARQ feedback for MBS services without confirming service interest first, then the feedback reporting is more immediate, but the feedback may be misattributed to the wrong MBS service
Solution Approach 1:
The UE performs preliminary actions by transmitting an MBS interest indication message to the network before providing HARQ feedback. The network responds with an MBS interest confirm message that establishes the UE's interest in specific MBS services. Only after receiving this confirmation does the UE start providing HARQ feedback, ensuring that feedback is correctly attributed to the intended service while maintaining timely reporting
2Adaptability or versatility
If the UE monitors for multiple MBS services concurrently, then the service reception capability is improved, but the feedback management complexity increases
Solution Approach 1:
The UE segments feedback management by maintaining separate HARQ feedback processes for each MBS service. When the UE receives an MBS interest confirm message for a specific service, it establishes dedicated feedback mechanisms for that service. This segmentation allows concurrent monitoring of multiple services while managing feedback complexity through service-specific feedback streams
Solution Approach 2:
The MBS interest confirm message acts as an intermediary that bridges the UE and network for each MBS service. This intermediary establishes the contractual relationship for feedback reporting, allowing the UE to manage multiple services concurrently by having separate confirmation messages and feedback channels for each service, thereby reducing overall management complexity
3Productivity
If the network processes feedback before receiving MBS interest confirmation, then the resource utilization is improved, but the feedback processing accuracy deteriorates
Solution Approach 1:
The network performs preliminary actions by receiving and processing the MBS interest indication message before expecting HARQ feedback. The network acknowledges this interest with an MBS interest confirm message, establishing the conditions for accurate feedback processing. This preliminary setup ensures that when feedback arrives, the network is prepared to process it with high accuracy while maintaining efficient resource utilization through advance service identification
Data Source
AI summary
A method in a user equipment (UE) for managing reception of multicast and/or broadcast services (MBS) includes transmitting (702) an MBS interest indication to a base station corresponding to an MBS service of interest. The method also includes receiving (704) an acknowledgement of the MBS interest indication from the base station. Further, the method includes starting (706) to provide feedback related to the MBS service in response to receiving the acknowledgement.