Link Switch Selection Using RSRP and Priority in Wireless Networks
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Solution Overview
Problem
Existing conditional handover command solutions in wireless communications networks face challenges when multiple target links fulfill the threshold criterion, leading to unclear selection for the UE and potential radio link failures due to unfulfilled conditions or excessive resource consumption.
Innovation Solution
A method where a network node transmits an indication to a wireless device to select a target link based on RSRP, RSRQ, SINR, priority, RACH resources, or the cell with latest measurements, allowing the device to execute a link switch when conditions are met, and includes mechanisms to avoid radio link failures by refraining from declaring failure if conditions are not met within a specified time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple target links are configured to fulfill the threshold criterion, then the UE has more options for handover, but the selection becomes unclear and may lead to radio link failures
Solution Approach 1:
The patent uses different priority values (e.g., priority 1, priority 2) to differentiate between multiple target links, analogous to using different colors to distinguish items. This allows the UE to clearly identify which target link to select among multiple candidates that fulfill the threshold criterion, eliminating selection ambiguity and preventing radio link failures.
2Reliability
If the UE continuously monitors multiple target links for handover conditions, then mobility robustness improves, but resource consumption increases
Solution Approach 1:
The patent applies different monitoring requirements to different target links based on their priority values. High-priority target links (e.g., priority 1) require continuous monitoring, while lower-priority links (e.g., priority 2) have reduced monitoring requirements. This localized differentiation improves mobility robustness for critical links while reducing overall device energy consumption.
3Measurement precision
If the UE selects a target link based on multiple criteria (RSRP, RSRQ, SINR), then selection accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the target link selection process into multiple independent criteria: RSRP-based selection, RSRQ-based selection, and SINR-based selection. Each criterion can be evaluated separately and independently, which maintains high selection accuracy while reducing device complexity through modular processing of each measurement parameter.
Data Source
AI summary
A first network node transmits, to a wireless device, a first indication. The first indication indicates to select, out of a plurality of target links simultaneously fulfilling a respective condition to switch from a source link to a target link, a first target link to switch from the source link to the selected first target link. The selecting is based on at least one of: a Reference Signal Received Power (RSRP) value, a Reference Signal Received Quality (RSRQ) value, a Signal to Interference and noise ratio (SINR) value, a priority, Random Access Channel (RACH) resources, a cell in which latest measurements were made, or a frequency, of the respective target links in the plurality of target links. The first network node then handles the link switch from the source link to the target link, based on the transmitted first indication.