Packet Zone Hysteresis Reset Timer for Mobile Station Reconnects
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Solution Overview
Problem
In wireless systems, mobile stations experience excessive packet data reconnects when moving between different SID/NID/PZID zones, leading to battery life reduction and increased cellular air-interface capacity consumption, due to the disabling of packet zone hysteresis feature during packet data exchanges.
Innovation Solution
Implementing a packet zone hysteresis reset timer to maintain the packet zone list entries and hysteresis timers even during packet data exchanges, and reactivating hysteresis after the timer expires, allowing the mobile station to delay reconnects until the next zone change, thus reducing unnecessary reconnects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If packet zone hysteresis is disabled during packet data exchanges to support short data bursts on control channels, then ease of operation is improved, but the number of reconnects increases excessively
Solution Approach 1:
The mobile station performs a packet data reconnect in advance when entering a new packet zone during an active packet data exchange, so that the reconnect is completed before the hysteresis timer would expire. This preliminary action ensures that the packet zone list is updated with the new zone, allowing subsequent visits to be suppressed by hysteresis, thereby reducing the total number of reconnects while still supporting short data bursts.
2Productivity
If packet zone hysteresis is maintained during packet data exchanges to reduce reconnects, then the number of reconnects decreases, but the ability to send short data bursts on control channels is lost
Solution Approach 1:
The system dynamically adjusts the state of packet zone hysteresis based on the operational context. During active packet data exchanges, the mobile station temporarily disables hysteresis to allow short data bursts on control channels. When hysteresis is disabled, the mobile station monitors for zone changes and performs reconnects to update the packet zone list. This dynamic adjustment allows the system to optimize for either reconnect reduction or short data burst capability depending on the current state.
3Reliability
If the mobile station frequently reconnects when moving between zones, then connectivity reliability is improved, but battery life is reduced
Solution Approach 1:
The mobile station uses feedback from the packet zone list and hysteresis timer status to make intelligent reconnect decisions. When the hysteresis timer has not expired for a visited zone, the mobile station suppresses reconnects even when moving between zones, thereby reducing unnecessary reconnections and conserving battery energy. The feedback mechanism allows the system to distinguish between necessary reconnects (when hysteresis has expired or the zone is not in the list) and unnecessary ones (when hysteresis is still active), optimizing the balance between connectivity reliability and energy consumption.
Data Source
AI summary
A system and method of packet zone hysteresis for a mobile station is presented. When a short data burst is to be sent on the control channel, a check is made to see if packet zone hysteresis might have caused the PCF-PSDN interface to be torn down, and if necessary, this interface is re-established by performing a packet data service reconnect to thereby enable transmission of the short data burst.