SRS Transmission Power Allocation for LAA Channel Estimation
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Solution Overview
Problem
Current LTE Release-13 SRS transmission processes face challenges with excessive dropping of SRS signals, especially in scenarios with multiple carriers and high uplink traffic, leading to inaccurate channel condition estimation for base stations.
Innovation Solution
The enhanced SRS transmission mechanism allows parallel transmission of SRS with PUSCH and PUCCH signals, prioritizing SRS transmission and adjusting power allocation to reduce dropping probabilities, especially in LAA cells and licensed cells, enabling more accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is performed in parallel with PUSCH and PUCCH, then channel estimation accuracy is improved, but transmission reliability deteriorates due to excessive signal dropping
Solution Approach 1:
The patent changes the parameter of transmission power allocation by introducing a priority-based power distribution mechanism. When SRS, PUSCH, and PUCCH transmissions overlap, the system assigns different priorities to these signals and adjusts their transmission powers accordingly, ensuring that high-priority signals maintain adequate power levels while lower-priority signals receive reduced power, thereby preventing excessive dropping while enabling parallel transmission
Solution Approach 2:
The patent implements dynamic signal prioritization where the system dynamically determines the priority of SRS, PUSCH, and PUCCH signals based on current transmission conditions and channel states. This dynamic approach allows the system to adaptively manage resource allocation and power distribution, enabling parallel transmission while maintaining transmission reliability through real-time adjustments
2Measurement precision
If SRS transmission priority is increased to reduce dropping, then channel estimation accuracy is improved, but uplink transmission efficiency deteriorates due to power allocation conflicts
Solution Approach 1:
The patent introduces a granular power allocation parameter system that allows independent power control for SRS, PUSCH, and PUCCH signals. By changing the power allocation parameters dynamically based on signal priority and channel conditions, the system ensures that SRS transmissions receive sufficient power for accurate channel estimation while PUSCH and PUCCH transmissions maintain adequate power levels, thus avoiding the need to excessively prioritize SRS at the expense of overall uplink efficiency
3Productivity
If parallel transmission of SRS with PUSCH and PUCCH is enabled, then uplink transmission efficiency is improved, but signal interference increases leading to higher dropping rates
Solution Approach 1:
The patent applies local quality differentiation by assigning different transmission characteristics to different signals based on their specific requirements. The system identifies the local needs of each signal type (SRS for channel sounding, PUSCH for data transmission, PUCCH for control information) and applies targeted power allocation and priority settings to each, thereby enabling parallel transmission while managing interference through localized optimization rather than uniform treatment
Solution Approach 2:
The patent introduces a signal priority management mechanism that acts as an intermediary between multiple uplink signals. This intermediary system arbitrates resource allocation and power distribution among SRS, PUSCH, and PUCCH signals, coordinating their transmissions to minimize interference while maintaining overall uplink efficiency through structured resource management
Data Source
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AI summary
A wireless device receives at least one message comprising configuration parameters of a plurality of cells comprising one or more licensed cells and one or more licensed assisted access (LAA) cells. The wireless device transmitting, in a subframe on an LAA cell of the one or more LAA cells, at least one sounding reference signal (SRS) employing a sounding procedure for the one or more LAA cells. The sounding procedure is independent of transmissions of a physical uplink shared channel (PUSCH) in the one or more licensed cells.