Inter-RAT Cell Reselection Measurement Scheduling
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Solution Overview
Problem
Current cell reselection mechanisms in wireless communication networks, such as those used in UMTS and LTE, are slow in transitioning from WCDMA to LTE cells, especially when maintaining reselection criteria over a certain time period, leading to inefficient network resource utilization and user experience.
Innovation Solution
Implementing a method where user equipment (UE) uses a fast measurement periodicity to monitor and reselect cells by considering monitored frequencies as a group, adjusting measurement frequency based on detected and undetected frequencies, and expediting measurements when reselection criteria are met, allowing for quicker cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current cell reselection mechanisms are used to ensure reliable cell selection by maintaining reselection criteria over a certain time period, then cell reselection reliability is improved, but cell reselection speed deteriorates
Solution Approach 1:
The patent applies dynamics by making the measurement periodicity adjustable rather than fixed. The system dynamically switches between normal measurement periodicity and fast measurement periodicity based on whether reselection criteria are met. When criteria are satisfied, fast periodicity is applied to accelerate reselection; when not satisfied, normal periodicity maintains reliability. This dynamic adaptation resolves the contradiction between reliability and speed.
Solution Approach 2:
The patent changes the measurement periodicity parameter from a static value to a conditional variable. By modifying the measurement periodicity parameter based on reselection criterion satisfaction, the system can transition from conservative slow measurements to aggressive fast measurements, thereby achieving both reliability (through initial verification) and speed (through accelerated measurements when conditions permit).
2Measurement precision
If normal measurement periodicity is used to monitor all frequencies, then measurement accuracy is maintained, but time consumption increases
Solution Approach 1:
The patent applies partial action by performing fast measurements only on frequencies where reselection criteria are already met, rather than uniformly applying fast periodicity to all frequencies. This selective approach maintains measurement accuracy on critical frequencies while reducing overall time consumption by skipping exhaustive measurements on non-critical frequencies.
Solution Approach 2:
The patent segments the frequency monitoring task into two groups: frequencies where reselection criteria are met (monitored with fast periodicity) and frequencies where criteria are not met (monitored with normal periodicity or skipped). This segmentation allows the system to allocate measurement resources efficiently, maintaining accuracy where needed while minimizing time consumption overall.
Data Source
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AI summary
Apparatus and method for wireless communication in a wireless communication network includes operating a wireless device on a first wireless communication technology. Aspects also include detecting a cell of a second wireless communication technology and determining the detected cell of the second wireless communication technology satisfies a first reselection criterion based on a first measurement. Still further the aspects includes expediting a determination of whether to perform cell reselection to the second wireless communication technology based on the detected cell of the second wireless communication technology satisfying the first reselection criterion. Additionally, aspects include determining to reselect to the detected cell of the second wireless communication technology when the at least one new measurement satisfies a second reselection criterion for the reselection time period.