Fast Measurement Trigger in RACH Msg4 for 5G Handover
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Solution Overview
Problem
Existing wireless communication methods in 5G networks face inefficiencies due to slow handover measurements, leading to suboptimal throughput, poor load balancing, and increased latency, particularly in scenarios where UEs frequently switch between cells with different frequency bands, resulting in inefficient use of radio resources.
Innovation Solution
A method where a wireless device receives a trigger message during the Random Access Channel (RACH) procedure to perform fast measurements within 200 milliseconds for intra-frequency and 480 milliseconds for inter-frequency carriers, enabling quicker detection of available carriers for Multi connectivity (MC)/Dual connectivity (DC)/Carrier aggregation (CA) options and improving load balancing between macro and small cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If handover measurements are averaged in time and performed slowly to avoid ping-pong effects, then handover stability is improved, but the ability to react to sudden channel changes in 5G NR deteriorates
Solution Approach 1:
The patent segments measurements into two distinct types: ordinary handover measurements (performed slowly with averaging to ensure stability) and fast measurements (performed quickly without averaging to detect sudden channel changes). This segmentation allows the system to simultaneously maintain handover stability while achieving fast response to channel variations by using fast measurements as triggers for potential handovers.
2Adaptability or versatility
If UEs frequently switch between cells with different frequency bands, then network adaptability is improved, but resource overhead and handover failure risk increase
Solution Approach 1:
The patent performs fast measurements during the random access procedure, which is a preliminary action before actual data transmission begins. By completing measurements and determining suitable target cells in advance (during RACH Msg4 reception), the system prepares handover decisions beforehand, reducing the need for frequent measurement updates and subsequent handover signaling during active data transmission, thereby reducing resource overhead.
3Use of energy by moving object
If UEs enter IDLE/INACTIVE state between data transmissions to save energy, then energy efficiency is improved, but throughput and load balancing performance deteriorate
Solution Approach 1:
The patent performs fast measurements during the random access procedure, which occurs when the UE transitions from IDLE/INACTIVE state to CONNECTED state. By completing measurements in advance during this transition phase, the system ensures that measurement results are ready immediately when data transmission begins, eliminating measurement delays and enabling immediate utilization of available carriers for throughput enhancement without requiring continuous measurements during IDLE state.
Data Source
AI summary
A wireless device, a network node and a respective method performed thereby for performing measurements for fast setup are provided. The method performed by the wireless device comprises receiving, during a RACH procedure, a “message 4” (Msg 4), which Msg 4 may be a contention resolution, the Msg 4 comprising a trigger for performing a fast measurement. The method also comprises performing a fast measurement on one or more carrier(s) that the wireless device receives. The method may further comprise sending a measurement report to the network node which sent the Msg 4 to the wireless device.