Frequency Hopping Measurement Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In frequency hopping systems, especially in IoT applications, wireless devices face challenges in measuring reference signals from neighboring cells due to unknown timing and frequency locations, leading to inefficient cell quality assessment and potential interference.
Innovation Solution
A method and system where network nodes coordinate measurement occasions by defining common time intervals and frequencies for reference signal transmission, allowing wireless devices to perform measurements more efficiently by deviating from their usual frequency hopping patterns during coordinated measurement occasions, and using listen-before-talk or random timing offsets to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices use frequency hopping patterns for reference signal transmission, then frequency diversity and interference avoidance are improved, but measurement timing and frequency locations become unknown, leading to inefficient cell quality assessment
Solution Approach 1:
The transmission time is segmented into different types of occasions: communication occasions for data transmission and measurement occasions for reference signal measurement. During measurement occasions, all cells transmit reference signals on common frequencies, allowing devices to efficiently measure multiple cells simultaneously. This segmentation resolves the contradiction by separating communication and measurement functions in time.
Solution Approach 2:
Measurement occasions are pre-configured and scheduled in advance, where reference signals from multiple cells are transmitted on predetermined common frequencies before the device needs to perform cell quality assessment. This preliminary action ensures that measurement information is ready when needed, improving measurement efficiency without disrupting normal frequency hopping communication.
2Measurement precision
If wireless devices perform measurements on all frequencies during frequency hopping, then measurement completeness is improved, but time spent on empty frequency regions increases
Solution Approach 1:
Instead of continuous measurement across all frequencies, the system uses periodic measurement occasions where reference signals are transmitted on specific common frequencies at predetermined intervals. During these periodic occasions, devices perform measurements efficiently on the active frequencies, while skipping empty frequency regions. This periodic action maintains measurement precision while reducing time loss.
3Productivity
If multiple cells transmit reference signals simultaneously on the same frequency, then measurement efficiency is improved, but signal collisions occur
Solution Approach 1:
Different cells are assigned different time offsets or frequency selections within the measurement occasion, creating locally optimized transmission conditions for each cell. This ensures that while multiple cells transmit reference signals during the same measurement occasion, their signals are temporally or spectrally separated to avoid collisions, maintaining both efficiency and signal quality.
Data Source
AI summary
A method (1100) in a wireless device (110) comprises identifying (1104) a configuration of a coordinated measurement occasion. The method comprises, during the coordinated measurement occasion (530, 630, 710, 830, 930), performing (1108) one or more measurements with respect to a plurality of reference signals transmitted from different cells (125, 515, 520, 525, 615, 620, 625, 715, 720, 725, 815, 820, 825, 915, 920, 925), in accordance with the identified configuration, wherein: each of the different cells is associated with at least one of the plurality of reference signals; and the configuration defines a common time interval and one or more common frequencies for the different cells to transmit their respective associated reference signal during the coordinated measurement occasion.