Uplink Parameter Determination via Downlink CSI
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Solution Overview
Problem
In wireless communication networks, the limited availability of sounding reference signals (SRSs) for uplink channel measurement poses challenges in determining optimal transmission parameters, leading to potential interference and reduced network performance.
Innovation Solution
A method and apparatus for a network node to determine uplink transmission parameters for a terminal device based on downlink information, allowing for reduced or no SRS transmission, thereby relaxing SRS resource limitations without complex system design or degradation of cell throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is increased to improve uplink channel measurement accuracy, then measurement precision is improved, but uplink radio resource consumption increases and interference is introduced
Solution Approach 1:
The patent uses downlink channel state information as a copy or substitute for uplink channel measurement. By exploiting channel reciprocity in TDD systems, the network node determines uplink transmission parameters based on downlink CSI reports from the terminal device, avoiding the need for separate uplink SRS transmissions while maintaining measurement accuracy.
2Manufacturing precision
If SRS transmission frequency is increased to improve transmission parameter determination, then transmission configuration accuracy is improved, but network resource efficiency deteriorates
Solution Approach 1:
The patent makes the downlink channel state information serve multiple functions. The CSI reports originally intended for downlink adaptation are also utilized for uplink transmission parameter determination, eliminating the need for separate uplink sounding resources and improving overall network resource efficiency.
3Productivity
If SRS resources are reduced to improve resource efficiency, then resource efficiency is improved, but transmission parameter determination capability deteriorates
Solution Approach 1:
The patent inverts the traditional approach by using downlink measurements to determine uplink parameters instead of using uplink SRS measurements. This reverse approach allows the system to maintain accurate transmission parameter determination while significantly reducing uplink sounding resource requirements.
4Loss of energy
If channel reciprocity is exploited to determine uplink parameters from downlink information, then SRS resource consumption is reduced, but system complexity increases due to reciprocity assumptions
Solution Approach 1:
The patent changes the operational parameters by exploiting channel reciprocity in TDD systems. By assuming that the uplink and downlink channels are reciprocal under certain conditions (same frequency, time proximity), the system can determine uplink parameters from downlink measurements without significantly increasing system complexity.
Data Source
AI summary
Various embodiments of the present disclosure provide a method for transmission configuration. The method which may be performed by a network node comprises determining one or more uplink transmission parameters for a terminal device based at least in part on downlink information reported by the terminal device. The method may further comprise transmitting configuration information to the terminal device to indicate the one or more uplink transmission parameters.