Mobile Device Cell Reselection Using Multi-Source Candidate Information
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Solution Overview
Problem
Mobile devices configured to operate using multiple Radio Access Technologies (RATs) face inconsistencies in reselecting to 3G or E-UTRAN networks due to inaccurate or incomplete network information about neighbor cells and frequencies, leading to delayed or inhibited network reselection.
Innovation Solution
A mobile device is designed to obtain candidate information for cell reselection by processing both the System Information 2 Quater (SI2Q) message from the serving cell and additional candidate information from neighbor cells, considering these sets to determine the best cell for reselection, thereby enhancing the accuracy and completeness of available network options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network provides neighbor cell information only from the serving cell (SI2Q message), then the device complexity is reduced, but the measurement precision and reliability of cell reselection are degraded due to inaccurate or incomplete information
Solution Approach 1:
The patent merges neighbor cell information from multiple sources: the serving cell's SI2Q message and individual neighbor cell messages. This combination allows the mobile device to compile a more complete and accurate list of candidate cells for reselection, overcoming the limitations of relying on a single source while managing device complexity through systematic processing of multiple information streams.
2Reliability
If the network provides comprehensive neighbor cell information from all neighbor cells, then the reliability of cell reselection is improved, but the loss of time for information processing increases
Solution Approach 1:
The patent implements preliminary actions by having the network pre-configure and broadcast neighbor cell information in SI2Q messages before the mobile device needs to perform reselection. This allows the device to have candidate cell lists readily available, reducing processing time when reselection decisions must be made, while still maintaining reliability through the comprehensive nature of the pre-provided information.
3Ease of operation
If the mobile device relies solely on SI2Q messages from the serving cell, then the ease of operation is improved, but the productivity of network reselection is degraded due to delayed or inhibited reselection
Solution Approach 1:
The patent enables the mobile device to self-enhance its cell reselection capability by actively obtaining and processing neighbor cell information from multiple sources beyond just the serving cell's SI2Q message. The device autonomously compiles a more comprehensive candidate cell list, improving reselection productivity without requiring complex network control or sacrificing ease of operation.
4Reliability
If the network provides accurate and complete neighbor cell information, then the reliability of cell reselection is improved, but the quantity of information transmitted increases
Solution Approach 1:
The patent segments neighbor cell information into individual messages from each neighbor cell, with each message containing information about a specific cell. This segmentation allows the network to transmit comprehensive information without overwhelming the system with a single large message, enabling the mobile device to compile complete neighbor cell lists while managing information transmission volume through structured, modular data delivery.
Data Source
AI summary
A method, computer readable medium and mobile device for operating using more than one Radio Access Technology (RAT) are provided. When the mobile device is operating in a serving cell of a first RAT, it obtains, through at least one of wireless access radios in the mobile device, a first set of candidate information from a message transmitted for the serving cell. It also obtains, through at least one of the wireless access radios, a second set of candidate information from a message transmitted for a neighbor cell of the serving cell. The mobile device considers the candidate information from the first set and the candidate information from the second set for reselection by the mobile device.