5G Beam Cell Network Discovery via Multi-Subband Synchronization
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Solution Overview
Problem
Current wireless communication systems face challenges in mid-to-high frequency bands due to channel blockage, which reduces spectral efficiency and hinders seamless mobility, especially in massive MIMO systems.
Innovation Solution
The implementation of a system framework for beam cell operation that utilizes multiple beams for network discovery and beam acquisition, allowing user equipment (UE) to detect and acquire multiple downlink transmit beams across different frequency subbands, employing primary and secondary synchronization signals (PSS/SSS) and analog beamformed reference signals, to enhance coverage and reduce detection latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used in mid-to-high frequency bands, then spectral efficiency is improved, but channel blockage occurs reducing efficiency and mobility
Solution Approach 1:
The patent segments the beam acquisition process into two distinct phases: initial beam acquisition using omnidirectional or wide-beam synchronization signals, followed by refined beamforming using narrow beams. This segmentation allows the system to overcome channel blockage during initial access while maintaining spectral efficiency through subsequent narrow beam operations, resolving the contradiction between spectral efficiency and reliability in mid-to-high frequency bands
2Area of stationary object
If multiple beams are acquired for network discovery, then coverage and detection performance are improved, but detection latency increases
Solution Approach 1:
The patent implements periodic transmission of synchronization signals across multiple beams, where each beam transmits synchronization signals at different time instances. This periodic action allows the UE to detect multiple beams for improved coverage while maintaining acceptable detection latency, as the structured periodic pattern enables efficient processing and early detection of available beams
3Object-generated harmful factors
If narrow beams are used in massive MIMO, then interference is reduced, but network discovery and beam acquisition complexity increases
Solution Approach 1:
The patent applies preliminary action by first establishing coarse beam alignment using wider beams for network discovery, then progressively refining to narrow beams for data transmission. This preliminary wide-beam phase simplifies the initial network discovery process, reducing the complexity of acquiring narrow beams later while still achieving the interference reduction benefits of narrow beamforming in massive MIMO systems
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 approach increases spectral efficiency, supports seamless mobility, and reduces interference by enabling UE to acquire multiple beams within one PSS/SSS instance, even with limited RF chains, thereby improving coverage and latency performance in mid-to-high frequency bands.
Implementation Method 1
A plurality of transmit beams may be beamformed with different downlink synchronization signals or different beam identifiers
Data Source
AI summary
A user equipment (UE) can process signals including a first synchronization signal (SS) and a second SS. The first SS and the second SS are beamformed with transmit beams and transmitted on subbands in a first set of symbols, for the first SS, and a second set of symbols, for the second SS. The UE can detect the first SS in the first set of symbols, and measure beam qualities of the transmit beams on the subbands in at least one of the first set of symbols or the second set of symbols. The UE can select one or more transmit beams and corresponding one or more subbands based on the measured beam qualities. The UE can detect the second SS on the selected subbands in the second set of symbol, and each of subbands in the first and second sets of symbols is associated with a transmit beam.