MBMS Configuration Validity Timing in Wireless Cells
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Solution Overview
Problem
In wireless communication systems, particularly in UMTS networks, there is a challenge in synchronizing the modification periods of MBMS service configurations across neighboring cells, leading to delays and incorrect configurations for mobile terminals receiving point-to-multipoint services, as existing methods lack clear indication of configuration validity timing for physical channels.
Innovation Solution
A method is proposed to generate and transmit a message with configuration information and validity timing for physical channels, including a reference to the control cell's System Frame Number, allowing mobile terminals to derive the validity timing and adjust their configurations accordingly, ensuring correct and timely reception of MBMS services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If configuration information for physical channels is transmitted without validity timing indication, then the message structure remains simple, but mobile terminals cannot determine when the configuration is valid, leading to synchronization errors and delays
Solution Approach 1:
The patent applies preliminary action by including validity timing information (such as modification period indicators or activation time stamps) in the configuration message before the mobile terminal applies the configuration. This allows the terminal to prepare in advance and apply the configuration at the correct time, resolving the contradiction by providing precise timing indication without significantly complicating the message structure.
2Reliability
If configuration information is updated frequently to maintain synchronization across neighboring cells, then service delivery accuracy improves, but signaling overhead and processing delays increase
Solution Approach 1:
The patent applies periodic action by organizing configuration updates around modification periods. The network can indicate that configurations remain valid for specific modification periods, allowing mobile terminals to maintain synchronization without requiring continuous updates. This reduces signaling overhead and processing delays while maintaining reliable service delivery across neighboring cells.
3Manufacturing precision
If validity timing information is included in configuration messages, then configuration application accuracy improves, but message size and processing complexity increase
Solution Approach 1:
The patent applies parameter changes by using compact timing indicators such as modification period numbers or relative time offsets instead of absolute timestamps. These parameter representations provide sufficient precision for configuration application timing while keeping the message size small and processing complexity low. The mobile terminal can derive the actual validity time from these compact parameters based on its local timing reference.
Data Source
AI summary
The invention proposes a method for indicating the validity of physical channels of a control cell and a neighboring cell carrying point-to-multipoint service data in a wireless communication system. The method includes the following steps: generating a message comprising configuration information for each of said channels; including validity information with the message for deriving the validity timing of the configuration information for each of said channels; and transmitting the message to a mobile terminal (10) through the control cell. The invention also proposes a mobile equipment (10) and a Radio Network Controller (111), respectively adapted to implement the above method.