Groupcast Power Control via Zone-Specific Pathloss Compensation
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G NR V2X, face challenges in efficiently managing transmitting power for Groupcast transmissions to minimize interference and energy consumption, while also accurately compensating for pathloss in varying environments.
Innovation Solution
A method involving the use of target and reference pathloss calculations, based on distance ratios and zone-specific models, to determine optimal transmitting power, which reduces interference and energy consumption, and enhances power control efficiency by leveraging UE channel measurement reports and geographic zone configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmitting power control is performed in NR V2X Groupcast transmissions, then interference is reduced and energy consumption is reduced, but accurate pathloss compensation becomes difficult due to varying transmission distances
Solution Approach 1:
The patent applies local quality by zone-specific pathloss compensation. Different geographic zones are defined with different reference distances and reference pathloss values. UEs in different zones use different compensation parameters tailored to their local propagation characteristics, enabling accurate pathloss compensation while maintaining power control benefits in heterogeneous wireless environments.
Solution Approach 2:
The patent changes parameters by introducing configurable reference distances and reference pathloss values that can be adjusted based on deployment scenarios. The network can configure different pathloss compensation parameters for different zones, allowing the system to adapt to varying transmission distances and propagation conditions while maintaining accurate power control.
2Measurement precision
If UE uses channel measurement reports from gNB for pathloss compensation, then power control accuracy is improved in uplink, but this approach cannot be directly applied to sidelink Groupcast transmissions
Solution Approach 1:
The patent introduces an intermediary approach where the network configures reference pathloss values and zone information for sidelink based on uplink measurements. The gNB acts as a mediator that translates uplink channel state information into appropriate sidelink pathloss compensation parameters, enabling accurate power control in sidelink Groupcast without requiring direct sidelink measurement infrastructure.
Solution Approach 2:
The patent achieves universality by making the pathloss compensation mechanism applicable to both uplink and sidelink transmissions. The same reference pathloss values and zone configurations configured for uplink power control are reused for sidelink Groupcast power control, enabling a unified power control framework across different transmission types.
3Manufacturing precision
If each Groupcast transmission obtains its own pathloss estimate, then transmission accuracy is improved, but system complexity and standardization workload increase significantly
Solution Approach 1:
The patent merges pathloss compensation by defining geographic zones where all UEs within a zone share the same reference pathloss value. Instead of each Groupcast transmission having independent pathloss estimates, multiple transmissions in the same geographic zone use common compensation parameters, reducing complexity while maintaining sufficient accuracy for group communications.
Solution Approach 2:
The patent applies partial action by providing pathloss compensation at the zone level rather than individual transmission level. This partial compensation approach is sufficient for Groupcast transmissions where exact per-transmission pathloss accuracy is not critical, thereby reducing system complexity and standardization burden while maintaining adequate transmission performance.
Data Source
AI summary
The disclosure provides a method and device in communication node for wireless communications. The communication node receives first information and second information, transmits a first signaling, and transmits a first signal; the first information is used for determining first power, the second information is used for determining a reference pathloss; wherein the first signaling is used for indicating a target distance and time-frequency resources occupied by the first signal; the reference pathloss corresponds to a reference distance, the reference distance being greater than 0; a ratio between the target distance and the reference distance as well as the reference pathloss are used together for determining a target pathloss; the target pathloss is used for determining second power, and a smaller value between the first power and the second power is used for determining transmitting power of the first signal. The present disclosure can effectively support power control for Groupcast.