UE-Specific Tracking Channel for Fast Reconnection in 5G
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Solution Overview
Problem
In 5G LTE wireless communications, the increasing density of network nodes and user equipment (UEs) leads to challenges in UE connection and identification, particularly in virtualized networks with high rates of handovers and the need for fast wake-up times, which complicates synchronization and reconnection processes.
Innovation Solution
A UE-specific tracking channel system is implemented, where UEs receive and transmit unique tracking sequences and transmission opportunities, allowing network nodes to detect UEs based on these sequences, facilitating efficient resource allocation and reducing the need for contention resolution and reconnection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use traditional idle mode with frequent wake-ups for tracking, then connection maintenance is possible, but battery consumption increases and fast wake-up advantage is lost
Solution Approach 1:
The patent extracts the tracking function from the traditional idle mode wake-up cycle by introducing a dedicated tracking channel that operates independently. UEs in idle mode can transmit tracking sequences on this dedicated channel without needing to fully wake up and establish complete connections, thereby maintaining connection state while minimizing energy consumption.
Solution Approach 2:
The tracking channel enables preliminary tracking actions to be performed before full connection establishment is needed. UEs can maintain their tracking state and connection information in advance, allowing for faster reconnection when data transmission is required, thus avoiding the energy-intensive frequent wake-ups of traditional idle mode.
2Measurement precision
If UE-specific tracking sequences are assigned to all UEs, then detection precision and false alarm reduction improve, but network complexity and resource allocation difficulty increase
Solution Approach 1:
The patent segments the tracking channel resources by assigning different orthogonal sequences to different UEs. This segmentation allows the network to detect multiple UEs simultaneously with high precision using simple correlation operations, avoiding the need for complex multi-user detection algorithms while maintaining low false alarm rates.
Solution Approach 2:
The patent changes the detection approach by using UE-specific sequence parameters (root indices, cyclic shifts) that enable simple correlation-based detection. This parameter-based differentiation allows precise UE identification without increasing network complexity, as the detection process remains computationally efficient.
3Reliability
If traditional random access procedures are used for reconnection, then connection establishment is possible, but reconnection time increases and fast wake-up benefit is reduced
Solution Approach 1:
The tracking channel enables UEs to perform preliminary tracking and maintain connection state information while in idle mode. When reconnection is needed, UEs can quickly transition from idle to connected state using their maintained tracking information, bypassing the lengthy random access procedure and achieving fast wake-up and reconnection.
Solution Approach 2:
The patent allows UEs to skip the traditional multi-step random access procedure by maintaining active tracking on the dedicated channel. This enables rapid reconnection through a simplified process that rushes through the essential steps without the delays of conventional random access, thus reducing reconnection time while maintaining reliability.
Data Source
AI summary
A method includes receiving, by a user equipment (UE) from a network node, a UE specific tracking sequence and assigned transmission opportunities and transmitting, by the UE to the network node, the UE specific tracking sequence in accordance with the assigned transmission opportunities.