Pre-notification for GERAN MBMS Power Reduction
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Solution Overview
Problem
Mobile stations (MS) experience increased power consumption due to frequent MBMS session notifications, leading to continuous reading of MBMS specific paging groups even when not required, resulting in higher battery drain and conflicts with other tasks.
Innovation Solution
The system eliminates the need for MS to read MBMS specific notification messages by using pre-notification information to identify the MBMS bearer service, allowing the MS to enter non-DRX mode and reducing the need for additional paging group monitoring, thereby avoiding extended paging and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MS continuously reads MBMS specific paging group messages to process lost pre-notifications, then notification reliability is improved, but power consumption increases by approximately 100%
Solution Approach 1:
The network sends pre-notification messages in advance to inform MS about upcoming MBMS notifications. This preliminary action allows MS to prepare for notifications without needing to continuously monitor the paging group, thereby reducing power consumption while maintaining notification reliability through the pre-notification mechanism itself.
2Reliability
If MS enters non-DRX mode after pre-notification to ensure notification reception, then notification reliability is improved, but power consumption increases
Solution Approach 1:
The pre-notification message is sent in advance to inform the MS about upcoming MBMS notifications. This preliminary notification allows the MS to remain in DRX mode while still being informed of notifications, eliminating the need to switch to non-DRX mode and thereby maintaining reliability without the power consumption penalty.
Solution Approach 2:
The pre-notification mechanism provides feedback to the MS about upcoming notifications before they actually occur. This feedback loop allows the MS to adjust its power state appropriately, remaining in low-power DRX mode while still being prepared for incoming notifications, thus avoiding unnecessary power consumption.
3Reliability
If MS reads all MBMS notification paging group messages to account for lost pre-notifications, then notification completeness is improved, but device complexity increases
Solution Approach 1:
The network performs the preliminary action of sending pre-notification messages before actual MBMS notifications. This advance notification allows the MS to process notifications more efficiently by knowing in advance when they will occur, reducing the complexity of continuously monitoring and processing potentially lost pre-notifications.
Data Source
AI summary
A system and method for reducing idle mode power consumption for mobile stations (MS) that have joined a Multimedia Broadcast/Multicast Service (MBMS) session and are waiting for the session to start. The invention is also directed to reducing the power consumption of an MS for which an MBMS session is inactive. In alternative aspects of the invention, the power consumption of mobile stations is reduced in the absence of ongoing MBMS session activity. Reduced power consumption is achieved by eliminating the need to read notification messages from an MBMS specific notification paging group when the notification message is for a different MBMS session than the paging group that the MS has currently joined.