RRC Resume Procedure for Wireless Cell Reselection Latency
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Solution Overview
Problem
Current wireless communications networks face challenges in efficiently handling diverse devices with varying data traffic profiles, particularly in supporting Ultra Reliable Low Latency Communications (URLLC) services, which require high reliability and low latency, and existing cell reselection methods can lead to increased latency and data transmission delays due to incorrect location information in the network.
Innovation Solution
A communications device initiates the RRC Resume procedure in a second cell before completing the process in the first cell, allowing for suspended RRC connection resumption, and performs an RNA update in the new cell to ensure accurate location tracking and reduce latency, especially for URLLC services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a device completes cell reselection before finishing RRC Resume procedure, then location accuracy is improved, but connection resumption reliability deteriorates
Solution Approach 1:
The device initiates the RRC Resume procedure in the new cell before fully completing cell reselection, performing the connection resumption action in advance to maintain reliability while allowing location update to proceed
Solution Approach 2:
The system allows the RRC Resume procedure to continue dynamically across cell boundaries, enabling the procedure to adapt to cell reselection events rather than requiring static cell completion first
2Reliability
If a device waits for RRC Resume completion before cell reselection, then connection reliability is improved, but transmission latency increases
Solution Approach 1:
The device skips the traditional sequential ordering by initiating RRC Resume in the new cell immediately after reselection, rushing through the location update process without waiting for procedure completion in the previous cell
Solution Approach 2:
The device performs cell reselection and initiates RRC Resume procedure in the new cell as preliminary actions before location update is fully complete, enabling faster transmission preparation
3Measurement precision
If a device performs RNA update after cell reselection, then location tracking accuracy is improved, but procedure complexity increases
Solution Approach 1:
The device merges the RNA update procedure with the ongoing RRC Resume procedure, combining location tracking update with connection resumption rather than handling them as separate sequential operations
Solution Approach 2:
The RRC Resume procedure is designed to handle multiple functions simultaneously including connection resumption and location tracking update, making the procedure multi-functional and reducing overall system complexity
Data Source
AI summary
A method of operating a communications device to perform cell reselection in a wireless communications network, the method comprising establishing a radio resource control (RRC) connection, suspending the RRC connection, transmitting a first message in a first cell, the message comprising a request that the RRC connection be resumed, before the RRC connection is resumed in the first cell, selecting as a serving cell a second cell different from the first cell, and transmitting a second message in the second cell, the second message comprising a request that the RRC connection be resumed.