Beamforming for D2D Uplink Sidelink Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing device-to-device communication, particularly in reducing interference between uplink and sidelink resources in LTE-based V2X systems, which is crucial for achieving high reliability and low latency in vehicle-to-everything communications.
Innovation Solution
The proposed method involves spatially dividing time/frequency resources using beams with distributed antennas, allowing UEs to share uplink and sidelink resources while minimizing interference by using beam restriction and recommendation information transmitted through downlink control signals, enabling simultaneous device-to-device communication without requiring constant base station coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink and sidelink resources share the same time/frequency resource, then resource utilization efficiency is improved, but interference between uplink and sidelink signals increases
Solution Approach 1:
The patent segments the shared time/frequency resource into different spatial regions using beamforming. By dividing the resource space into multiple beams with different spatial directions, the system allows simultaneous uplink and sidelink transmissions on the same frequency resources while maintaining isolation through spatial separation, thus resolving the interference issue while preserving high resource utilization
Solution Approach 2:
The patent applies local quality by assigning different beamforming characteristics to different spatial regions. Each beam is optimized with specific beamforming weights and directions tailored to its local spatial characteristics, allowing the system to maximize resource utilization in each spatial region while minimizing interference through localized spatial filtering
2Object-affected harmful factors
If beamforming is used to spatially divide shared resources, then interference between uplink and sidelink is reduced, but system complexity increases due to beam management requirements
Solution Approach 1:
The patent performs preliminary beam selection and configuration before actual uplink and sidelink transmissions. By pre-establishing beam pairs and their spatial relationships, the system reduces real-time beam management complexity while maintaining effective interference reduction through spatial division
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors beam performance and provides feedback for beam refinement. This allows the system to adaptively optimize beamforming parameters based on actual channel conditions and interference levels, maintaining low complexity through feedback-driven incremental adjustments rather than exhaustive real-time optimization
3Productivity
If distributed antennas are applied with beamforming, then spatial division of resources is achieved, but hardware complexity and cost increase
Solution Approach 1:
The patent makes the distributed antenna system multi-functional by using the same antenna elements for both uplink reception and sidelink transmission through beamforming. The antenna array serves multiple purposes: it performs spatial division for resource sharing, provides beamforming for interference reduction, and enables both uplink and sidelink operations, thereby justifying the hardware investment through multiple functional benefits
Data Source
AI summary
Provided are a method and equipment for performing device-to-device communication by sharing an uplink resource and a sidelink resource in a wireless communication system. Particularly, a first terminal transmits a reference signal to a base station. The first terminal receives a downlink control signal from the base station. The downlink control signal includes beam limiting information indicating a beam, which is not used for reducing interference with an uplink signal, when the first terminal transmits a sidelink signal. The first terminal transmits the sidelink signal to a second terminal by using beams excluding the beam indicated by the beam limiting information. The sidelink signal is transmitted through a resource pool in which the uplink resource and the sidelink resource are overlapped in time and frequency domains.