Random Access Back-Off Scaling for Reduced Capability Terminals
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Solution Overview
Problem
Next-generation wireless communication systems face challenges in supporting explosive data traffic, high transmission rates, numerous connected devices, low latency, and energy efficiency, particularly for terminals with reduced capabilities during random access procedures.
Innovation Solution
A method and apparatus for performing a random access procedure in wireless communication systems, where terminals receive configuration information with a scaling factor for a back-off indicator, transmit a first random access preamble, and subsequently transmit a second preamble after applying the scaling factor to the back-off time, allowing for deferred or limited random access parameters to manage cell congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals with reduced capabilities perform random access procedures using standard back-off indicators, then the random access procedure can be completed, but cell congestion increases and access efficiency deteriorates
Solution Approach 1:
The patent applies different back-off indicator scaling factors to different terminal types. Specifically, terminals with reduced capabilities (e.g., reduced capability UEs) receive a scaling factor of 0.5, while other terminals receive a scaling factor of 1.0. This local differentiation allows the system to optimize random access behavior for specific terminal categories without affecting overall system performance, thereby improving access efficiency for vulnerable terminals while managing cell congestion.
Solution Approach 2:
The patent introduces a scaling factor parameter that modifies the back-off indicator value. By changing the scaling factor parameter from the standard 1.0 to 0.5 for reduced capability terminals, the back-off time is effectively halved, enabling these terminals to access the network more quickly. This parameter change directly addresses the contradiction by adjusting the back-off mechanism to suit specific terminal capabilities.
2Loss of time
If standard random access procedures are used without scaling factors, then the procedure is simple to implement, but terminals with reduced capabilities experience delayed access and higher latency
Solution Approach 1:
The patent applies preliminary action by pre-configuring scaling factors for different terminal types before the random access procedure begins. The base station determines the terminal type and assigns the appropriate scaling factor (0.5 for reduced capability terminals, 1.0 for others) in advance. This preliminary configuration ensures that when the random access procedure starts, terminals with reduced capabilities are already optimized for faster access, reducing latency without requiring complex real-time adjustments.
Solution Approach 2:
The patent segments the terminal population into different categories (reduced capability terminals versus other terminals) and applies different scaling factors to each segment. This segmentation allows the system to handle diverse terminal requirements separately, providing optimized access for reduced capability terminals while maintaining standard operation for others, thus balancing latency reduction with manageable complexity.
3Adaptability or versatility
If uniform back-off indicators are applied to all terminals, then configuration is straightforward, but terminals with reduced capabilities cannot access the network efficiently during high traffic conditions
Solution Approach 1:
The patent implements local quality by providing differentiated configuration information to different terminal types. Reduced capability terminals receive configuration information with a scaling factor of 0.5, while other terminals receive configuration with a scaling factor of 1.0. This localized optimization enables the system to adapt to specific terminal capabilities without requiring complete reconfiguration of the random access procedure, thereby improving adaptability while controlling complexity.
Data Source
AI summary
Disclosed are a method and apparatus for performing a random access procedure in a wireless communication system. The method for performing a random access procedure according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, configuration information related to random access, wherein the configuration information includes a scaling factor for a back-off indicator (BI) for a specific type of terminal; transmitting a first random access preamble to the base station; receiving, from the base station, a random access response (RAR) in response to the first random access preamble, wherein the RAR includes the BI; and on the basis of the RAR not including a random access preamble identifier (RAPID) associated with the first random access preamble, transmitting a second random access preamble to the base station.