Receive Beam Selection for LBT in Shared Spectrum
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Solution Overview
Problem
Conventional techniques for supporting communications using beams in shared radio frequency spectra are deficient, leading to inefficiencies and potential interference in wireless communications systems, particularly when performing listen before talk (LBT) procedures.
Innovation Solution
A wireless device selects a receive beam that corresponds to or is quasi co-located with the transmit beams to be used in a transmission opportunity, based on energy or quasi co-location criteria, to efficiently perform LBT procedures and gain access to the shared spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional techniques are used for beam-based communications in shared spectrum, then communications can be established, but LBT procedures become inefficient and cause delays
Solution Approach 1:
The system performs preliminary beam identification and quasi-co-location determination before executing LBT procedures. By pre-establishing the relationship between transmit and receive beams, the system avoids time-consuming beam search during LBT, thereby reducing delay and improving procedure efficiency
Solution Approach 2:
The patent introduces quasi-co-location as an intermediary concept that links transmit beams with receive beams. This intermediary relationship allows the system to efficiently map transmit beam directions to corresponding receive beams without direct measurement, streamlining the LBT process
2Reliability
If multiple transmit beams are used in a transmission opportunity, then spectrum access reliability improves, but determining the appropriate receive beam for LBT becomes complex
Solution Approach 1:
The patent establishes a universal quasi-co-location relationship that can apply to multiple transmit beams simultaneously. A single receive beam can be quasi co-located with multiple transmit beams, allowing the system to handle multiple beams without proportionally increasing complexity in receive beam selection
Solution Approach 2:
The system changes the selection criterion from direct beam correspondence to quasi-co-location based on energy thresholds. By using energy-based quasi-co-location parameters, the system simplifies the mapping between multiple transmit beams and receive beams, making the selection process more manageable
3Ease of operation
If a receive beam is selected without proper correspondence to transmit beams, then LBT procedure is simpler, but interference detection becomes inaccurate
Solution Approach 1:
The patent replaces direct mechanical beam alignment procedures with quasi-co-location based selection. Instead of physically aligning or measuring each beam pair, the system uses energy-based quasi-co-location parameters to determine correspondence, simplifying the operation while maintaining measurement accuracy through established beam relationships
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for efficiently identifying a receive beam for performing a listen before talk (LBT) procedure in an attempt to gain access to a transmission opportunity (TxOP) in a shared radio frequency spectrum. In particular, a wireless device may select a receive beam that corresponds to one or more transmit beams to be used in a TxOP to perform an LBT procedure in an attempt to gain access to the TxOP. In one example, the wireless device may select a receive beam for performing an LBT procedure based on the energy of each of the transmit beams to be used in a TxOP. In another example, the wireless device may select a receive beam for performing an LBT procedure if the receive beam is quasi co-located with each of the transmit beams to be used in a TxOP.