Scheduling Requests for Spatial Multiplexing Radar Sensing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing scheduling requests for spatial multiplexing, particularly in avoiding interference between radar sensing and uplink or sidelink communications.
Innovation Solution
A method where user equipment (UE) transmits scheduling requests indicating beam directions, beamwidths, and angular areas of interest for radar sensing, allowing the network entity to grant resources for specific radar sensing transmit beams that minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time-frequency resources are allocated for radar sensing, then radar sensing capability is improved, but uplink communication resources are reduced
Solution Approach 1:
The patent introduces spatial dimension (beam directions) as a new resource dimension for multiplexing. Instead of only time-frequency multiplexing, the system now multiplexes radar sensing and uplink communications in the spatial domain by assigning different beam directions to different UEs, enabling simultaneous operation without increasing time-frequency resource allocation.
Solution Approach 2:
The patent merges radar sensing and uplink communication operations into the same time-frequency resources by using spatial separation through beamforming. Multiple UEs can perform radar sensing and uplink transmissions simultaneously on overlapping time-frequency resources as long as their beam directions are sufficiently separated to avoid interference.
2Productivity
If spatial multiplexing is implemented for radar sensing, then resource efficiency is improved, but interference between radar sensing and communications increases
Solution Approach 1:
The patent implements a feedback mechanism where UEs report their intended beam directions for radar sensing to the network entity. The network entity uses this feedback information to determine appropriate beam directions for uplink communications and to schedule resources, thereby avoiding interference while maximizing spatial multiplexing opportunities.
Solution Approach 2:
The patent employs dynamic beam direction selection and switching based on real-time interference conditions. The system can dynamically adjust beam directions and resource allocations to adapt to changing spatial interference scenarios, allowing flexible optimization of the trade-off between resource efficiency and interference avoidance.
3Measurement precision
If beam direction information is collected from UEs, then spatial multiplexing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the beam direction indication mechanism universal by allowing UEs to indicate beam directions for multiple purposes: radar sensing resource scheduling, uplink communication scheduling, and interference avoidance. This multi-functional approach reduces the need for separate signaling mechanisms and minimizes overall overhead.
Solution Approach 2:
The patent applies partial action by collecting and processing only the essential beam direction information needed for spatial multiplexing decisions, rather than requiring complete spatial characterization data. The system processes sufficient beam direction indicators to achieve accurate spatial separation while minimizing data collection and signaling requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit an uplink message (e.g., a scheduling request) indicating one or more beam directions (e.g., one beam direction, a set of beam directions, a sequence of beam directions), one or more beamwidths (e.g., for the one or more indicated beam directions), an angular area of interest for radar sensing, or a combination thereof. The network entity may then provide, to the UE, a grant of resources for performing the radar sensing on specific radar sensing transmit beams (e.g., that will not interfere with other radar sensing by other UEs, uplink communications form other UEs, sidelink communications by other UEs, etc.). The UE may indicate the directions of the beams with reference to a global coordinate system. The network may configure the UE with lookup tables (LUTs) defining relationships between indices, beam directions and/or beamwidths.