User Terminal RRC Connection Rejection Load Distribution
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Solution Overview
Problem
In mobile communication systems, existing technologies fail to appropriately distribute load across cells, leading to inefficient use of resources as user terminals in an RRC idle state are not effectively redirected to less loaded cells during the selection of a serving cell.
Innovation Solution
A user terminal is configured to interrupt the random access procedure upon receiving a predetermined message from a connection target cell, allowing it to select a different cell as the serving cell based on load conditions, thereby distributing the load more evenly across available cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a user terminal continuously performs random access procedure to establish RRC connection, then the connection establishment speed is improved, but the load on the target cell increases and may cause network congestion
Solution Approach 1:
The network performs preliminary load evaluation before allowing random access. The base station determines whether the cell load is below a threshold value and only permits random access when conditions are favorable, preventing premature access attempts that would increase load without benefit
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors cell load conditions and controls whether user terminals can perform random access. This feedback loop allows the network to dynamically adjust access permissions based on current load, balancing connection establishment speed with load management
2Productivity
If load distribution across cells is optimized, then resource utilization is improved, but the complexity of cell selection and load monitoring increases
Solution Approach 1:
The system changes the parameter of load threshold values dynamically. The base station determines load conditions by comparing current load against threshold values and adjusts access permissions accordingly. This parameter-based control simplifies the complexity by providing clear decision criteria rather than complex selection algorithms
Data Source
AI summary
A user equipment, apparatus, and method transmits a random access preamble to a cell and receives a message including a random access response as a response to the random access preamble from the cell. The message indicates that a Radio Resource Control (RRC) connection to the cell is rejected.