Multi-Mode Mobile Station Sleep Mode Alignment
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Solution Overview
Problem
Current multi-mode mobile stations face limitations in managing multi-radio access technology environments due to conflicts in paging schedules between different radio access technologies, such as WiMAX and CDMA, which restrict their ability to efficiently switch between networks and listen for paging messages.
Innovation Solution
The method involves measuring a time cross-reference between frames of different radio access technologies, determining optimal WiMAX sleep mode parameters, and using enhanced MOB_SLP-REQ and MOB_SLP-RSP messages to align WiMAX sleep windows with CDMA paging intervals, allowing the mobile station to switch between networks without terminating connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station switches to the second network to monitor paging messages, then the ability to receive paging messages from the second network is improved, but the connection with the first network is terminated causing loss of service
Solution Approach 1:
The patent implements dynamic network switching by allowing the mobile station to transition between active and sleep states in the first network, and between idle and active states in the second network. This dynamic state management enables the system to adapt to different operational requirements, maintaining connectivity to both networks at different times without permanent termination of either connection
Solution Approach 2:
The patent employs periodic monitoring of paging messages in the second network during sleep periods of the first network. The mobile station periodically wakes up to check for paging messages from the second network, then returns to sleep mode, creating a rhythmic pattern of activity that allows both networks to be monitored without continuous interference
2Productivity
If the mobile station maintains connection with the first network, then service continuity is improved, but the ability to monitor paging messages from the second network is restricted
Solution Approach 1:
The patent performs preliminary measurements of time cross-reference between frames of the first and second networks before establishing the sleep mode configuration. This advance preparation allows the system to pre-calculate optimal sleep window timings that will align with second network paging opportunities, ensuring both networks can be serviced without conflict
Solution Approach 2:
The patent introduces enhanced MOB_SLP-REQ and MOB_SLP-RSP messages as intermediaries to negotiate sleep mode parameters between the mobile station and the first network base station. These enhanced messages carry additional information about second network paging timing, allowing the base station to configure sleep windows that accommodate dual-network requirements
3Reliability
If sleep mode parameters are configured to align with second network paging intervals, then paging message monitoring is improved, but the complexity of parameter configuration increases
Solution Approach 1:
The patent implements a feedback mechanism where the mobile station measures the time cross-reference between first and second network frames, then uses this measurement information to calculate and propose appropriate sleep mode parameters. The base station receives this feedback and can adjust parameters accordingly, creating a closed-loop system that automatically optimizes timing alignment without manual configuration
Data Source
AI summary
Embodiments of the present disclosure may provide a method of managing multi-mode operations such that a multi-mode MS may utilize the WiMAX sleep mode for monitoring the paging intervals of other supported radio access technologies. For example, certain embodiments may enable the MS to determine a set of WiMAX sleep mode parameters that align a WiMAX sleep window with a CDMA page listening window. Additionally, certain embodiments may provide enhanced MOB_SLP-REQ and MOB_SLP-RSP messages enabling the multi-mode MS to establish a WiMAX sleep mode based on the previously determined WiMAX sleep mode parameters. As a result, embodiments of the present disclosure may enable an MS to manage multi-mode operations, such that the MS 430 may better employ the WiMAX sleep mode for switching from the WiMAX network to the CDMA network to listen for CDMA paging.