Multicast Reception on Active BWP via Inactivity Timer Restart
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Solution Overview
Problem
Terminal devices experience interruptions in multicast service reception due to the expiration of the BWP inactivity timer while switching to BWPs that do not support MBMS service, affecting user experience.
Innovation Solution
The terminal device transmits indication information to the network to restart the BWP inactivity timer upon receiving DCI for the multicast service, allowing continuous reception on the active BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the terminal device operates on the active BWP before the BWP inactivity timer expires, then the terminal device can receive unicast service, but when the BWP inactivity timer expires the terminal device switches to other BWPs and cannot continue receiving multicast service
Solution Approach 1:
The terminal device performs preliminary action by transmitting indication information to the network device before the BWP inactivity timer expires, indicating the target multicast service. This allows the network device to prepare and send DCI for scheduling the multicast service on the active BWP, ensuring continuous reception without interruption when the timer expires.
Solution Approach 2:
The terminal device provides feedback to the network device by transmitting indication information about the target multicast service. The network device responds by sending DCI with scheduling information, creating a feedback loop that ensures the terminal device can continue receiving multicast service on the active BWP even after the inactivity timer expires.
2Ease of operation
If the terminal device switches to other BWPs when the BWP inactivity timer expires, then the terminal device follows normal BWP management procedure, but the terminal device may be unable to continue receiving the multicast service on the switched BWP
Solution Approach 1:
The terminal device transmits indication information to the network device before the BWP inactivity timer expires, indicating the target multicast service. This preliminary action enables the network device to send DCI for scheduling the multicast service on the active BWP, ensuring that even when the timer expires and BWP switching occurs, the terminal device can maintain multicast service reception on the active BWP.
3Reliability
If the terminal device restarts the BWP inactivity timer when receiving multicast service data on the first BWP, then the terminal device can maintain the active BWP for continuous multicast service reception, but the terminal device requires coordination with the network device through indication information
Solution Approach 1:
The terminal device transmits indication information to the network device in advance, indicating the target multicast service. This preliminary action triggers the network device to send DCI for scheduling the multicast service on the active BWP, enabling the terminal device to restart the BWP inactivity timer and maintain continuous reception without complex operational procedures.
Data Source
AI summary
A method for receiving multicast service data is provided. The method includes the following. A terminal device transmits first indication information to a network device, where the first indication information indicates a target multicast service. The terminal device receives at least one downlink control information (DCI) transmitted by the network device, where the at least one DCI is used for scheduling the target multicast service. The terminal device restarts a bandwidth part (BWP) inactivity timer when the terminal device receives on a first BWP, according to the at least one DCI, data of the target multicast service transmitted by the network device.