Hybrid Terminal Access Probe Timing for Paging Channel Monitoring
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Solution Overview
Problem
Hybrid terminals cannot monitor the 1xEV-DV system for incoming calls while attempting to access the 1xEV-DO system, as they need to perform time-critical tasks during the access procedure, which disrupts the monitoring of the paging channel.
Innovation Solution
The terminal determines a protected time interval for access probes to the 1xEV-DO system that does not overlap with tune-away intervals, allowing it to temporarily tune away and monitor the 1xEV-DV system without disrupting the access procedure by adjusting the transmission times of access probes to avoid overlap with assigned paging slots or silence intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal performs time-critical access tasks during the access procedure to the 1xEV-DO system, then the access speed and efficiency are improved, but the terminal cannot monitor the 1xEV-DV paging channel, resulting in missed incoming calls
Solution Approach 1:
The patent segments the access procedure into multiple access probes transmitted at different times. By dividing the access process into discrete probe transmissions with intervals between them, the terminal creates opportunities to tune away and monitor the paging channel during the intervals, while still completing the access procedure within acceptable timeframes.
Solution Approach 2:
The patent implements periodic transmission of access probes with specific timing intervals. The terminal transmits access probes at predetermined intervals and uses these periodic opportunities to periodically tune away and monitor the paging channel, ensuring both access progress and call monitoring capability.
2Reliability
If the terminal monitors the 1xEV-DV paging channel continuously, then incoming calls are not missed, but the access procedure to the 1xEV-DO system is delayed
Solution Approach 1:
The patent applies preliminary action by transmitting access probes in advance at optimized intervals before the terminal needs to tune away for paging monitoring. The terminal prepares and sends access probes during periods when paging monitoring is not required, so that by the time tuning away is needed, the access procedure has already progressed to a point where delays are minimized.
3Productivity
If the terminal transmits access probes at regular intervals, then the access procedure progresses systematically, but the protected time interval may overlap with tune-away intervals, causing missed paging messages
Solution Approach 1:
The patent implements dynamic adjustment of access probe transmission timing based on the terminal's tune-away schedule. Instead of fixed regular intervals, the terminal dynamically calculates and adjusts the transmission times of access probes to ensure that the protected time intervals (when the terminal must be tuned to the 1xEV-DO system) do not overlap with tune-away intervals (when the terminal needs to monitor the 1xEV-DV paging channel).
Data Source
AI summary
To access a first communication system, a terminal determines a transmission time for an access probe, an expected response time from the system, and a protected time interval based on the transmission time and/or expected response time. The terminal determines a starting time for sending the access probe such that the protected time interval does not overlap a tune-away interval in which the terminal is to monitor anther frequency/air-interface. This starting time may be set initially to the end of a prior access probe plus a pseudo-random wait duration and may be advanced forward or moved backward in time, if needed, by a time duration selected such that the protected time interval does not overlap the tune-away interval.