User Equipment Measurement Time Allocation for CSG Reselection
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Solution Overview
Problem
In cellular communication networks, particularly in the LTE and UMTS systems, User Equipment (UE) faces challenges in efficiently performing measurements during Discontinuous Reception (DRX) cycles to meet the stringent requirements for cell reselection, especially when autonomous reselection to Closed Subscriber Group (CSG) cells is involved, leading to potential deterioration of mobility performance.
Innovation Solution
The UE intelligently allocates time for performing measurements by prioritizing and scaling measurement requirements, allowing for parallel execution of existing cell reselection and autonomous CSG search/reselection, ensuring that pre-defined requirements are met without compromising mobility performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs measurements on CSG cells, carrier frequencies of low or equal priority, and carrier frequencies of higher priority during DRX cycles, then autonomous CSG reselection capability is achieved, but the measurement time requirements cannot all be met simultaneously, leading to deterioration of mobility performance
Solution Approach 1:
The patent segments the measurement time for different measurement types. Specifically, it divides the available measurement time into distinct portions: one segment for measurements on carrier frequencies of low or equal priority (meeting pre-defined requirements), and another segment for measurements on CSG cells and higher priority frequencies. This time segmentation allows the UE to handle multiple measurement tasks without compromising the reliability of mobility-critical measurements.
Solution Approach 2:
The patent applies different quality requirements to different measurement types based on their priority. Measurements on carrier frequencies of low or equal priority are performed with pre-defined requirements, while measurements on CSG cells and higher priority frequencies can have relaxed or scaled requirements. This local quality differentiation ensures that critical mobility measurements maintain high reliability while enabling autonomous CSG reselection functionality.
2Measurement precision
If the UE allocates sufficient time for autonomous CSG search and reselection measurements, then CSG reselection accuracy is improved, but the time available for existing cell reselection measurements is reduced
Solution Approach 1:
The patent implements partial action by performing measurements on CSG cells and higher priority carrier frequencies only during the remaining time after completing measurements on low or equal priority carriers. Instead of allocating equal time to all measurement types, the UE performs critical measurements first and then performs additional CSG measurements if time permits. This partial action approach ensures that existing cell reselection requirements are always met while attempting to provide CSG reselection capability when resources allow.
Data Source
AI summary
A method in a User Equipment (UE) of performing measurements of a plurality of measurement types is provided. The UE performs a measurement of a first measurement type and at least one of a measurement of a second and a third measurement type. In the performed measurements:the at least one of a measurement of the second and the third measurement type is performed during a required time such that first pre-defined requirements for the at least one of a measurement of the second and third measurement type are met, the required time forming part of a time available for measurements, andthe measurement of the first measurement type is performed during a remaining time, during which the at least one of a measurement of the second measurement type and a measurement of the third measurement type is not performed.