Split Bearer Data Path Selection Using PDCP Increment Rate
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Solution Overview
Problem
In wireless communication systems, particularly in the context of the New Radio Access Technology (NR) system, there is a need for a method to support the random access procedure without random access preamble collisions between user equipment (UE) devices, which is not efficiently addressed by existing technologies.
Innovation Solution
A method for user equipment (UE) operating a split bearer involves configuring a Packet Data Convergence Protocol (PDCP) entity and two Radio Link Control (RLC) entities, calculating the PDCP data increment rate, and determining the data path based on this rate and a predefined threshold value to decide whether to transmit PDCP SDUs to both or a specific data path, ensuring efficient communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pre-processing and fast scheduling are used in the NR system, then communication speed and efficiency are improved, but unintended single-path operation occurs in split bearer
Solution Approach 1:
The patent implements dynamic path selection by continuously monitoring PDCP data arrival rates and adjusting data path selection accordingly. The system transitions from static single-path operation to dynamic multi-path operation based on real-time traffic conditions, resolving the contradiction between fast scheduling benefits and split bearer reliability.
Solution Approach 2:
The patent changes the decision parameter from simple buffer status to PDCP data arrival rate threshold comparison. By monitoring whether the PDCP data arrival rate exceeds a predefined threshold, the system dynamically adjusts between single-path and multi-path operation modes, ensuring reliable split bearer operation while maintaining communication speed.
2Device complexity
If data is transmitted through a single data path, then device complexity is reduced, but communication performance is degraded
Solution Approach 1:
The patent segments the data transmission decision into two distinct modes: single-path mode for low traffic conditions and multi-path mode for high traffic conditions. This segmentation allows the system to manage complexity by applying different transmission strategies based on traffic load, improving communication performance without permanently increasing device complexity.
Solution Approach 2:
The system dynamically adjusts the number of active data paths based on PDCP data arrival rate thresholds. When traffic exceeds the threshold, both data paths are activated to improve performance; when traffic is low, single-path operation maintains simplicity. This dynamic adaptation resolves the contradiction between complexity and performance.
3Productivity
If random access preamble is reused for connection re-establishment, then resource utilization is improved, but preamble collision occurs between UE devices
Solution Approach 1:
The patent introduces a new preamble format (preamble format B) as an intermediary resource specifically for connection re-establishment procedures. This dedicated preamble acts as a mediator that separates re-establishment traffic from initial access traffic, improving resource utilization by enabling efficient reuse of existing preambles for their original purpose while eliminating collisions through dedicated re-establishment preambles.
Data Source
AI summary
The method for a user equipment (UE) operating a split bearer in a wireless communication system according to an embodiment of the present application comprises steps of configuring a Packet Data Convergence Protocol (PDCP) entity and two Radio Link Control (RLC) entities associated with the split bearer; wherein a first RLC entity is configured as a first data path of the split bearer, wherein a second RLC entity is configured as a second data path of the split bearer, calculating an PDCP data increment rate; and determining a data path of the split bearer based on the PDCP data increment rate and a predefined threshold value.