Backoff Parameter Control for Wireless Coverage Enhancement
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Solution Overview
Problem
In wireless communication systems, low-complexity user equipment (UEs) face inefficiencies in the random access procedure, particularly in changing coverage enhancement levels, leading to unnecessary backoff procedures that increase power consumption and delay.
Innovation Solution
A method and apparatus for controlling the backoff procedure in user equipment (UE) by performing a random access procedure in a first coverage enhancement level, selecting a random access resource associated with a second level, setting the backoff parameter to zero for the second level, and executing the random access procedure in that level, thereby avoiding unnecessary backoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE performs backoff procedure when changing coverage enhancement levels, then random access resource selection is standardized, but unnecessary backoff delays access procedure and increases power consumption
Solution Approach 1:
The patent changes the backoff parameter value specifically when transitioning between coverage enhancement levels. The UE sets the backoff parameter to zero when selecting a random access resource associated with a different CE level, thereby eliminating unnecessary backoff delays while maintaining the standardized backoff procedure for same-level transitions.
2Ease of operation
If the UE performs backoff procedure when changing coverage enhancement levels, then random access resource selection is standardized, but power consumption increases due to unnecessary backoff
Solution Approach 1:
The patent modifies the backoff parameter setting based on CE level transitions. When the UE determines to select a random access resource associated with a second CE level different from the first, it sets the backoff parameter to zero, thereby reducing power consumption by avoiding unnecessary backoff operations while maintaining standardized procedure for non-transition cases.
3Device complexity
If the UE uses smaller frequency bandwidth for MTC, then cost and battery consumption are reduced, but coverage capability is limited
Solution Approach 1:
The patent implements dynamic switching between different coverage enhancement levels based on random access success. The UE can transition from one CE level to another during the random access procedure, allowing low-complexity MTC UEs to adapt to varying coverage conditions without requiring fixed high-bandwidth configurations, thereby maintaining both low device complexity and reliable coverage capability.
Data Source
AI summary
A method and apparatus for controlling a backoff procedure for coverage enhancement (CE) in a wireless communication system is provided. A user equipment (UE) performs a random access procedure in a first CE level, determines to select a random access resource associated with a second CE level, sets a backoff parameter to zero for the second CE level, and performs the random access procedure in the second CE level.