RIS Beamforming via Orthogonal Time-Domain Resource Pools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In frequency division duplex wireless communication systems, the traditional method of determining uplink spatial transmission parameters based on downlink spatial reception parameters is no longer applicable due to differences in the spatial relation between downlink reception and uplink transmission under Reconfigurable Intelligent Surface (RIS) coverage, leading to inconsistent coverage areas and reduced system performance.
Innovation Solution
The introduction of orthogonal time-domain resource pools for uplink and downlink transmissions allows RIS to perform beamforming for specific directions, ensuring correct transmission and reception of signals, thereby addressing the inconsistency in coverage areas and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the traditional method of determining uplink spatial transmission parameters based on downlink spatial reception parameters is used, then the system maintains simplicity in parameter determination, but the coverage areas become inconsistent and system performance deteriorates under RIS coverage in frequency division duplex systems
Solution Approach 1:
The patent segments the spatial parameter determination process by introducing separate spatial relation information for downlink and uplink transmissions. Instead of assuming spatial reciprocity, the system now independently determines downlink spatial parameters (based on downlink reference signals) and uplink spatial parameters (based on uplink reference signals), allowing each direction to be optimized independently for consistent coverage areas under RIS coverage.
2Adaptability or versatility
If RIS performs beamforming for specific beam directions at each moment, then the system achieves flexible and controllable shaped beams to eliminate coverage blind zones, but the spatial relation between downlink reception and uplink transmission becomes different from conventional scenarios
Solution Approach 1:
The patent applies dynamics by making the spatial relation information configurable and adaptable. The system dynamically adjusts spatial parameters based on whether the communication is under RIS coverage or conventional coverage. The network can configure different spatial relation information for different scenarios, allowing the system to adapt to the presence of RIS while maintaining manageable complexity through standardized configuration mechanisms.
3Reliability
If orthogonal time-domain resource pools are introduced for uplink and downlink transmissions, then the reliability of uplink transmission is enhanced and coverage consistency is improved, but the system complexity increases due to additional resource pool management
Solution Approach 1:
The patent resolves the contradiction by moving the differentiation between uplink and downlink resource management to the time domain dimension. By allocating orthogonal time-domain resource pools, the system ensures that uplink and downlink transmissions do not interfere with each other while maintaining independent spatial parameter determination. This dimensional separation simplifies the overall management by providing clear temporal boundaries for resource allocation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the reliability of uplink transmission, optimizes system parameters, and improves overall network quality by dynamically adjusting resource allocation based on interference conditions, while reducing hardware complexity and costs.
Implementation Method 1
Each RIS unit has an independent electromagnetic wave modulation capability, and the response of each unit to the radio signal can be controlled by changing parameters of the RIS unit, spatial distribution, etc., such as phase, amplitude, and polarization. Through the mutual superposition of the radio response signals of a large number of RIS units, specific beam propagation properties are formed on the macro level, thus forming a flexible and controllable shaped beam
Data Source
AI summary
A first node receives a first reference signal in a first RS resource; first operates a first signal on a first frequency band; a duplex mode of the first frequency band is a frequency division duplex; the first operating is to receive and the first signal is on a downlink working band, or the first operating is to transmit and the first signal is on an uplink working band; the first signal is spatially associated with the first RS resource; when the first operating is to receive, time-domain resources occupied by the first signal are not overlapping with a first time-domain resource pool; when the first operating is to transmit, time-domain resources occupied by the first signal are not overlapping with a second time-domain resource pool; time-domain resources occupied by the first time-domain resource pool are orthogonal to time-domain resources occupied by the second time-domain resource pool.