Measurement Reporting Timer Adaptation for 5G CGI Acquisition
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Solution Overview
Problem
Current solutions for measurement reporting in 5G new radio (NR) networks, such as the T321 timer, are not suitable for diverse deployment scenarios and use cases, leading to inefficient CGI reporting due to overly conservative timer settings, especially in cases where NR cells do not broadcast SIB1 and require longer times for CGI acquisition.
Innovation Solution
A method for determining measurement reporting timer values based on the radio access technology (RAT) and frequency range of neighbor cells, allowing the UE to select the appropriate transceiver for CGI retrieval, with specific timer values for different frequency ranges (e.g., 2 seconds for FR1 and 16 seconds for FR2), optimizing timer selection for dual or multiple connectivity scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conservative timer value (e.g., 8 seconds) is used for CGI reporting, then the timer covers all possible scenarios including frequency retuning, but it causes unnecessary waiting time in cases where the UE can acquire CGI quickly
Solution Approach 1:
The patent applies dynamics by making the timer value adjustable rather than fixed. The network can dynamically configure different timer values (e.g., first timer value for FR1, second timer value for FR2) based on the frequency range and deployment scenario. This allows the system to adapt the timer duration to match actual acquisition conditions, avoiding both premature expiration and unnecessary waiting.
Solution Approach 2:
The patent changes the timer parameter from a single fixed value to multiple configurable values based on frequency range. By introducing frequency-range-dependent timer values (shorter for FR1 where SIB1 is always broadcast, longer for FR2 where SIB1 may not be broadcast), the system optimizes the balance between reliability and delay for different deployment scenarios.
2Device complexity
If a single timer value is used for all frequency ranges, then the configuration is simple, but it cannot optimize for specific deployment scenarios like FR2 where SIB1 may not be broadcast
Solution Approach 1:
The patent segments the timer configuration by frequency range. Instead of using a single timer value for all scenarios, it divides the configuration into at least two segments: one for FR1 (with shorter timer since SIB1 is always broadcast) and one for FR2 (with longer timer since SIB1 may not be broadcast). This segmentation allows optimized performance for each frequency range while maintaining manageable configuration complexity.
Solution Approach 2:
The patent applies local quality by tailoring the timer value to the specific characteristics of each frequency range. FR1 gets a shorter timer value appropriate for its always-broadcast SIB1 characteristic, while FR2 gets a longer timer value suitable for its optional SIB1 broadcasting. This localized optimization improves CGI reporting efficiency without requiring complex global reconfiguration.
3Reliability
If the UE retunes to the serving carrier during CGI acquisition, then the serving cell reception is maintained, but the CGI acquisition time is extended beyond the original timer duration
Solution Approach 1:
The patent applies preliminary action by pre-configuring the timer value to account for the frequency retuning requirement. The network knows in advance that the UE may need to retune to the serving carrier during CGI acquisition, so it sets the timer duration long enough to accommodate this necessary interruption. This ensures the timer doesn't expire prematurely while maintaining serving cell connection reliability.
Data Source
AI summary
According to certain embodiments, a method in a wireless device for measurement reporting comprises: receiving an instruction to perform measurement reporting for a neighbor cell; determining, based at least on a radio access technology (RAT) of the neighbor cell and a frequency range of the neighbor cell, a measurement reporting timer value for performing the measurement reporting; and measuring a radio signal of the neighbor cell during the time specified by the determined measurement reporting timer value.