Terminal MBS Session Synchronization via Wake-Up Feedback
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Solution Overview
Problem
The updated start time and activation time of a Multicast/Broadcast Service (MBS) session cannot be notified to a User Equipment (UE) when it is unreachable, leading to synchronization issues and increased power consumption due to incorrect wake-up times.
Innovation Solution
The UE receives first time information to monitor for MBS data at a specified time, transitions to a connected state if no data is received after multiple attempts, and then receives updated time information to synchronize with the network, ensuring timely reception of MBS data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE transitions to sleep state to save power, then power consumption is reduced, but the UE cannot receive updated MBS session time information when unreachable
Solution Approach 1:
The UE performs preliminary actions by waking up at specified activation times to monitor for MBS data and send failure indications before actually needing to update session information. This allows the network to proactively provide updated time information when the UE becomes reachable, resolving the contradiction between sleeping to save power and needing to receive updates.
Solution Approach 2:
The UE sends feedback messages (failure indications) to the network when it cannot receive MBS data during wake-up periods. This feedback mechanism enables the network to understand the UE's reception status and provide updated session time information accordingly, allowing the UE to maintain power savings while ensuring information synchronization.
2Reliability
If the UE wakes up frequently to monitor for MBS data, then synchronization with network is improved, but power consumption increases
Solution Approach 1:
The UE implements periodic wake-up at specified activation times to monitor for MBS data, rather than continuous monitoring. This periodic action maintains synchronization with the network while significantly reducing power consumption compared to continuous monitoring, as the UE can sleep between activation times.
Solution Approach 2:
The UE autonomously determines whether to wake up for monitoring based on received session time information and local conditions. This self-service approach allows the UE to optimize its wake-up behavior, waking up only when necessary to maintain synchronization while minimizing unnecessary wake-ups that would increase power consumption.
3Use of energy by moving object
If the UE remains in idle state to save power, then power consumption is reduced, but the UE cannot receive time updates when unreachable
Solution Approach 1:
The UE sends failure indications as a preliminary action when it cannot receive MBS data during periodic wake-ups. This allows the network to proactively push updated session time information to the UE when it becomes reachable, ensuring the UE can adapt to new session times without needing to continuously monitor for updates while in idle state.
Solution Approach 2:
The network acts as an intermediary by receiving failure indications from the UE and providing updated session time information in response. This intermediary mechanism enables the UE to remain in low-power idle state while still being able to receive necessary updates when the network initiates communication based on the failure indication.
Data Source
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AI summary
Provided are information transmission method and apparatus, terminal and first network function entity, which relates to communications field. The method applied to a terminal comprises: receiving first start time and/or first activation time of an MBS session from a first network function entity; when number of repeated execution of a target process reaches a first number and a paging message and/or service data related to the MBS session is not acquired, transitioning to a connected state from an idle state, wherein the target process comprises waking up at first start time and/or first activation time, monitoring or attempting to receive the paging message and/or the service data; receiving a first message from the first network function entity, wherein a second time message in the first message is for instructing a terminal to receive, at second start time and/or second activation time, the paging message and/or the service data.