Location-Guided Millimeter-Wave Beam Sweeping for Device-to-Device Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing device-to-device connections in millimeter wave frequencies due to high path loss and short range, which hinders effective beam management and resource utilization in vehicle-to-everything (V2X) applications.
Innovation Solution
The method involves obtaining connection setup parameters for millimeter wave unicast sidelinks from a previously established non-millimeter wave link, using location information to beam sweep transmit and receive beams, thereby optimizing beam pair link acquisition and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam sweeping is performed on millimeter wave frequencies for device-to-device communications, then beam management efficiency is improved, but system complexity increases due to the need for precise beam alignment and coordination
Solution Approach 1:
The patent applies preliminary action by performing beam sweeping during the sidelink discovery procedure on a first frequency band before establishing millimeter wave communications. Location information is obtained in advance to determine beam directions, so when beam sweeping occurs on the second frequency band, the beams are already pre-aligned based on previously acquired location data, reducing the complexity of real-time beam coordination
Solution Approach 2:
The patent uses location information as an intermediary element that mediates between the transmitting and receiving devices. By obtaining location information during the discovery procedure and using it to determine beam directions, the system creates a common reference framework that simplifies beam alignment coordination between devices without requiring complex direct negotiation
2Reliability
If beam sweeping is performed in multiple directions to establish reliable millimeter wave links, then connection reliability is improved, but time consumption increases due to the sweeping process
Solution Approach 1:
The patent applies local quality by focusing beam sweeping efforts on specific directions based on location information rather than performing exhaustive omnidirectional sweeping. The transmitting and receiving devices use obtained location data to determine relevant beam directions, concentrating the beam sweeping process only where connections are likely to be established, thus maintaining reliability while reducing time consumption
Solution Approach 2:
The patent implements partial action by performing beam sweeping on a selected subset of frequency bands and directions rather than exhaustive sweeping across all possibilities. By using location information to identify promising directions and limiting beam sweeping to those specific directions on the second frequency band, the system achieves sufficient connection reliability without the time cost of complete beam sweeping
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a first user equipment (UE) performs a limited beam sweep of one or more transmit beams on a second frequency band in an estimated direction from the first UE to the second UE, wherein the estimated direction is based on one or more parameters received over a previously established signaling radio bearer (SRB) on a first frequency band and/or a device-to-device discovery procedure performed on the first frequency band, receives, over the SRB, a confirmation that a data radio bearer (DRB) has been established on the second frequency band with at least one transmit beam of the one or more transmit beams, and sends, to the second UE, a data flow over the DRB on the second frequency band using the at least one transmit beam.