Cell Reselection via Carrier Spreading Parameter for Load Distribution
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Solution Overview
Problem
Conventional cell reselection procedures in wireless communication systems, particularly in LTE networks, lead to excessive load burden on frequencies with high priority and fail to concentrate UEs within small cells, resulting in inefficient load distribution and coverage issues.
Innovation Solution
A method where UEs perform cell reselection based on a carrier spreading parameter and redistribution priority received from the network, using a redistribution test involving a random number to select frequencies, allowing UEs within small cell coverage to reselect to the small cell and those outside to reselect to remaining cells in a distributed manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cell reselection procedure selects frequency with highest priority, then frequency selection is simplified, but excessive load burden occurs on the frequency with highest priority
Solution Approach 1:
The patent introduces a redistribution priority parameter that is dynamically assigned to frequencies based on current load conditions. This parameter change allows the system to adjust frequency attractiveness in real-time, redirecting UEs from overloaded high-priority frequencies to alternative frequencies, thereby balancing load while maintaining the simplicity of priority-based selection.
Solution Approach 2:
The patent makes the frequency priority dynamic by allowing the network to update redistribution priorities based on current load conditions. Instead of static frequency priorities, the system continuously adapts priority assignments to reflect real-time network state, enabling load redistribution without changing the fundamental selection mechanism.
2Ease of operation
If cell reselection applies highest priority to selected frequency, then frequency selection is straightforward, but UEs within small cell coverage cannot be concentrated on the small cell
Solution Approach 1:
The patent modifies the priority parameter assigned to small cell frequencies through redistribution priority assignment. By dynamically adjusting this parameter based on small cell load and coverage conditions, the system can increase the attractiveness of small cell frequencies to nearby UEs, encouraging concentration in appropriate small cells while maintaining straightforward priority-based selection behavior.
3Adaptability or versatility
If conventional cell reselection is used in heterogeneous network, then network deployment is flexible, but load distribution becomes inefficient
Solution Approach 1:
The patent implements a feedback mechanism where the network monitors load conditions on different frequencies and cells, then uses this information to adjust redistribution priorities. This closed-loop control enables the system to adapt to changing traffic patterns and load conditions in heterogeneous networks, improving load distribution efficiency while preserving the flexibility of diverse network deployments.
Solution Approach 2:
The patent introduces dynamic priority adjustment that responds to real-time network conditions in heterogeneous environments. By making frequency priorities adaptive rather than static, the system can efficiently distribute load across macro cells, small cells, and different frequency layers according to current utilization, maintaining deployment flexibility while enhancing load balancing.
Data Source
AI summary
A method for a terminal to perform cell reselection procedures in a wireless communication system, and an apparatus supporting the same are provided. The terminal may: receive, from a network, a carrier spreading parameter and re-spreading priority; select a frequency on the basis of a re-spreading test; assign the re-spreading priority to the selected frequency; and perform cell reselection procedures on the basis of the assigned re-spreading priority. The carrier spreading parameter may be a variable for re-spreading of the terminal.