Bandwidth Part Segmentation for Random Access Collision Reduction
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Solution Overview
Problem
In wireless communication systems, the existing methods for performing a random access (RA) procedure with data transmission in the RRC_INACTIVE state face challenges such as increased collision between different purpose RA procedures and limited bandwidth for data transmission.
Innovation Solution
The method involves configuring at least one first bandwidth part (BWP) for data transmission in the RRC_INACTIVE state and a second BWP for shifting to the RRC_CONNECTED state, allowing the RA procedure to be performed on different BWPs based on the data transmission requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single BWP is used for RA procedure in RRC INACTIVE state, then device complexity is reduced, but collision between different purpose RA procedures increases and data transmission reliability deteriorates
Solution Approach 1:
The patent divides the BWP into multiple sub-BWPs: a first BWP for RA procedure with data transmission in RRC INACTIVE state, and a second BWP for RA procedure to transition to RRC CONNECTED state. This segmentation allows different RA procedures to be performed on separate frequency resources, eliminating collisions and improving data transmission reliability while maintaining manageable complexity through structured configuration.
2Productivity
If larger bandwidth is allocated for data transmission in RRC INACTIVE state, then data transmission capacity is improved, but collision with other RA procedures increases
Solution Approach 1:
The patent segments the available bandwidth into distinct BWPs: the first BWP is dedicated to RA procedure with data transmission in RRC INACTIVE state, while the second BWP is dedicated to RA procedure for transitioning to RRC CONNECTED state. This segmentation enables larger bandwidth allocation for data transmission without increasing collision probability, as each BWP operates independently on separate frequency resources.
3Productivity
If RA procedure is performed on a dedicated BWP for data transmission, then data transmission efficiency is improved, but connection establishment time increases
Solution Approach 1:
The patent segments RA procedures into two separate BWPs: the first BWP handles data transmission in RRC INACTIVE state with higher efficiency, while the second BWP handles connection establishment transitions. This segmentation allows optimized performance for each function independently - data transmission benefits from dedicated resources while connection establishment maintains efficient transition paths.
Solution Approach 2:
The patent configures both BWPs in advance during system setup, so that when data transmission is needed in RRC INACTIVE state, the UE can immediately use the pre-configured first BWP without delay. The second BWP is also pre-configured for rapid transition to connected state when needed, eliminating setup delays.
Data Source
AI summary
The present invention relates to a method of performing a Random Access (RA) procedure in a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of configuring at least one first bandwidth part (BWP) on which the RA procedure is performed for transmitting data in a Radio Resource Control (RRC) INACTIVE state; configuring a second BWP on which the RA procedure is performed for shifting to a RRC CONNECTED state from the RRC INACTIVE state; performing the RA procedure on the at least one first BWP when the UE determines to transmit the data in the RRC INACTIVE state; and performing the RA procedure on the second BWP when the UE determines to shift to the RRC CONNECTED state from the RRC INACTIVE state.