Staggered Comb-N Positioning Reference Signaling for Interference Reduction
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Solution Overview
Problem
Current Positioning Reference Signals (PRS) in wireless communication technologies face interference issues due to resource usage, leading to suboptimal positioning accuracy and increased latency in 5G networks, particularly in scenarios where multiple network nodes transmit simultaneously.
Innovation Solution
Implementing a comb-n structure for PRS, which involves staggering and reordering of symbol groups within a slot, utilizing zero-power and non-zero power resource elements to minimize interference and optimize resource usage, allowing for efficient power distribution and improved channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRS are transmitted by network nodes using standard comb structure, then positioning reference signaling is provided, but interference with other signals and PRS from other network nodes increases
Solution Approach 1:
The patent divides the slot into multiple symbol groups and applies different comb structures to each group. Specifically, it uses a first comb structure for a first symbol group and a second comb structure for a second symbol group, where the comb structures are differentiated by their comb factors or starting positions. This segmentation allows PRS from different network nodes to be separated in the time-frequency grid, reducing interference while maintaining positioning reference signaling reliability.
Solution Approach 2:
The patent dynamically configures different comb structures for different symbol groups within the same slot. The network node is configured with a reference signaling configuration that specifies these varying comb structures, allowing adaptive resource allocation. This dynamic approach enables the system to optimize interference avoidance while ensuring sufficient PRS coverage for accurate positioning.
2Reliability
If PRS resources are allocated to improve positioning accuracy, then positioning performance improves, but resource usage increases and latency increases
Solution Approach 1:
By segmenting the slot into multiple symbol groups with different comb structures, the patent enables more efficient use of available time-frequency resources. This allows positioning information to be gathered from multiple network nodes within a single slot without requiring extended measurement periods, thereby reducing latency while maintaining positioning accuracy.
Solution Approach 2:
The network node is pre-configured with the reference signaling configuration that includes the varying comb structures before the actual PRS transmission. This preliminary configuration allows the system to optimize resource allocation in advance, ensuring that positioning measurements can be completed efficiently without requiring additional time for resource negotiation or reconfiguration.
Data Source
AI summary
There is disclosed a method of operating a network node in a radio access network, the method including transmitting reference signaling based on a reference signaling configuration, the reference signaling configuration corresponding to a comb-n structure for a symbol group of a slot, wherein the reference signaling configuration corresponds to a staggered and/or re-ordered comb-n structure for one or more other symbol groups of the slot. The disclosure also pertains to related devices and methods.