Low-Tier UE Cross-Link Interference Measurement via Resource Block Segmentation
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Solution Overview
Problem
Low-tier UEs in wireless communication systems face challenges in performing cross-link interference (CLI) measurements due to limited bandwidth and processing capabilities, which hinders their ability to facilitate spectrum reuse across UEs.
Innovation Solution
The system allows low-tier UEs to obtain CLI measurements using a reduced number of resource blocks (RBs) and relaxes the processing time for these measurements, enabling them to activate a time division duplex (TDD) slot format associated with a TDD configuration or communication schedule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-tier UEs perform CLI measurements using the total number of RBs configured for signal strength measurement, then measurement precision is improved, but device complexity and processing requirements increase beyond their capabilities
Solution Approach 1:
The patent segments the resource blocks (RBs) into two categories: a first set of RBs used for CLI measurements and a second set of RBs not used for CLI measurements. This segmentation allows low-tier UEs to perform measurements on only the first set of RBs, reducing processing complexity while maintaining measurement capability. The network can configure the size of the first set to match the UE's processing capabilities.
Solution Approach 2:
The patent applies local quality by allowing different RBs to have different functions: the first set of RBs is optimized for CLI measurements while the second set can be used for other purposes. This enables low-tier UEs to focus their limited processing resources on the critical measurement function without being burdened by the entire bandwidth, thus reducing device complexity while preserving measurement precision where needed.
2Measurement precision
If low-tier UEs perform CLI measurements over the complete configured RB set, then measurement accuracy is improved, but the measurement time exceeds the CLI time threshold
Solution Approach 1:
By segmenting the RBs into a first set for measurements and a second set for other uses, the patent reduces the measurement bandwidth. This segmentation directly reduces the time required to complete measurements, allowing low-tier UEs to meet the CLI time threshold while maintaining adequate measurement accuracy on the reduced set.
Solution Approach 2:
The patent applies partial action by having UEs measure only a portion of the total configured RBs (the first set) rather than the complete set. This partial measurement approach is sufficient to achieve the required measurement accuracy for CLI detection while ensuring the measurement completes within the time threshold, thus resolving the time-loss issue.
3Ease of operation
If low-tier UEs are configured with reduced RB sets for CLI measurements, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces dynamics by allowing the network to flexibly configure the size and composition of the first set of RBs based on the specific UE's capabilities and the current network conditions. This dynamic configuration enables the system to optimize the balance between ease of operation and measurement precision for each UE, rather than using a fixed reduced set for all UEs.
Solution Approach 2:
The patent applies parameter changes by allowing the network to adjust the number of RBs in the first set, the bandwidth allocation, and other measurement parameters to match the low-tier UE's capabilities. By changing these parameters appropriately, the system maintains measurement precision within the constraints of reduced operation complexity, resolving the contradiction between ease of operation and precision.
4Measurement precision
If low-tier UEs use extended CLI time periods beyond the threshold, then measurement precision is improved, but productivity of the system decreases
Solution Approach 1:
By segmenting RBs into a measurement-optimized first set and a second set for other purposes, the patent enables measurements to be completed faster within the time threshold. This segmentation allows the system to maintain productivity through faster measurement turnaround while achieving sufficient precision on the reduced RB set, thus resolving the productivity issue.
Solution Approach 2:
The patent applies continuity of useful action by allowing the second set of RBs to be continuously utilized for other purposes (data transmission, other measurements) rather than being idle during extended measurement periods. This continuous utilization maintains system productivity and spectrum reuse efficiency while the first set of RBs is used for timely CLI measurements.
Data Source
AI summary
Apparatuses and methods for cross link interference measurements by low-tier UEs are described. An apparatus is configured to obtain a CLI measurement based on a set of RBs associated with a DL channel from a network node. The set of RBs includes one of (1) less than a total number of RBs configured for a signal strength CLI measurement or (2) at least the total number of RBs configured for a power CLI measurement. The set of RBs is within a CLI time period that exceeds a CLI time threshold. The apparatus is configured to activate, based on the CLI measurement, a TDD slot format associated with a TDD configuration or a communication schedule from the network node.