Cell Reselection Control for Uniform Terminal Distribution
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Solution Overview
Problem
The Frequency Layer Convergence (FLC) method in UMTS systems leads to an imbalance in terminal distribution across frequencies, causing inefficient allocation of radio resources and potential service quality issues, as terminals remain on a preferred frequency even after the MBMS service is completed, resulting in wasted power and suboptimal resource utilization.
Innovation Solution
A method for controlling user equipment (UE) to perform cell reselection among multiple frequencies after completing a point-to-multipoint service, regardless of traditional cell reselection criteria, to achieve a more uniform distribution of terminals across frequencies, allowing the base station to regulate load and improve service quality by selecting the best available frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Frequency Layer Convergence (FLC) method is used to provide MBMS service, then service quality is improved by concentrating terminals on preferred frequency, but terminal distribution becomes imbalanced and radio resource allocation becomes inefficient
Solution Approach 1:
The patent applies dynamics by making the frequency assignment flexible and changeable. Terminals are not fixed on a single preferred frequency but can dynamically switch between multiple frequencies based on real-time network conditions and terminal requirements, transforming the static frequency assignment into a dynamic adaptive system that optimizes resource allocation while maintaining service quality
Solution Approach 2:
The patent changes the parameter of frequency assignment from fixed to variable. By allowing terminals to be assigned to multiple frequencies simultaneously and enabling frequency switching based on changing conditions, the system optimizes the frequency distribution parameter to balance service quality and resource allocation efficiency
2Duration of action of stationary object
If terminals remain on preferred frequency after MBMS service completion, then service continuity is maintained, but power consumption increases and resource utilization deteriorates
Solution Approach 1:
The patent implements periodic action by establishing a timing mechanism that triggers frequency reselection after a predetermined period following MBMS service completion. This periodic reselection allows terminals to maintain service continuity during the active period while enabling power-saving frequency changes after the service ends, optimizing the balance between continuity and energy efficiency
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple frequencies as candidate frequencies before the MBMS service completes. The network prepares frequency reselection parameters in advance, enabling terminals to quickly switch frequencies after service completion without delay, thus maintaining continuity while reducing power consumption through proactive frequency management
3Reliability
If traditional cell reselection criteria are strictly followed, then terminal stays on optimal frequency, but uniform distribution across frequencies cannot be achieved
Solution Approach 1:
The patent applies universality by making the frequency assignment system multi-functional. A single frequency can serve multiple purposes: it can be a preferred frequency for MBMS service, a candidate frequency for future reselection, or a fallback frequency. Terminals can be associated with multiple frequencies simultaneously, allowing the system to fulfill both optimization and distribution flexibility requirements through a unified frequency management approach
Data Source
AI summary
A method for controlling a user equipment (UE) capable of receiving a point-to-multipoint service in a wireless communication system comprises receiving a point-to-multipoint service and performing a cell reselection in response to completion of the receiving of the point-to-multipoint service. The cell reselection is performed among multiple frequencies. The cell reselection may be performed in response to signaling from the network. The cell reselection may be performed regardless of whether cell reselection criteria are satisfied. The cell reselection criteria may comprise at least one of a cell reselection reference value between frequencies and a cell reselection reference value within a frequency. The cell reselection criteria may be embodied in frequency layer dispersion (FLD) information. Alternatively, the cell reselection criteria may be embodied in frequency lay convergence (FLC) information.