Default Paging Channel Selection for Wireless Handoff Reliability
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Solution Overview
Problem
In cellular wireless communication systems, mobile stations may miss page messages when moving between coverage areas with different numbers of paging channels, leading to potential call failures during access handoff due to the time required to hash onto new paging channels.
Innovation Solution
Implementing a method where the mobile station automatically selects a default paging channel, typically the primary channel, when moving to a neighboring coverage area with a different number of paging channels, allowing it to monitor this channel immediately without going through the hashing process, and the network also uses this default channel for page messages, ensuring message receipt during handoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station uses hashing algorithm to select paging channel in new coverage area, then the paging channel load is evenly distributed, but the mobile station may miss page messages during handoff due to hashing time delay
Solution Approach 1:
The mobile station performs preliminary action by selecting a default paging channel (e.g., primary paging channel) before completing the hashing process when moving to a new coverage area. This allows the mobile station to start monitoring a paging channel immediately upon entering the new coverage area, avoiding message loss during the hashing computation time. The hashing algorithm is then applied to determine the final paging channel, but the default channel provides immediate coverage.
2Reliability
If the mobile station immediately monitors a paging channel upon entering new coverage area, then message receipt is ensured, but the paging channel load becomes unbalanced
Solution Approach 1:
The system uses preliminary action by having the mobile station select a default paging channel (such as the primary paging channel) immediately upon entering a new coverage area, ensuring message receipt is not missed. After this preliminary monitoring setup, the hashing algorithm is subsequently applied to determine the optimal paging channel for load distribution. This two-stage approach ensures both reliable message receipt and balanced load distribution.
Data Source
AI summary
Disclosed is a method and system to manage paging channels in a wireless communication network. When the network encounters a situation where the network is to transmit an access response message in a coverage area to a mobile station, the network will determine whether the mobile station is in an access handoff state. If not, the network will transmit the message to the mobile station on a paging channel selected based on the mobile station's identifier. Otherwise, the network will transmit the message to the mobile station on both that paging channel and a default paging channel (e.g., primary channel) selected without consideration of the mobile station's identifier. This process can help avoid an access handoff failure. Further, a radio access network may opt to use the default paging channel in response to the wireless coverage area having a different number of paging channels than an adjacent coverage area.