Terminal Beam Determination Using Pre-configured Target Beams
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Solution Overview
Problem
In new radio (NR) wireless communication technologies, especially in frequency range 2, high-frequency channels attenuate rapidly, making it challenging for terminal devices to determine beams for adequate signal coverage, particularly when common beams are not indicated in signaling.
Innovation Solution
A method and device for determining a beam, where a terminal device receives signaling from a network device to perform communication transmission or reception using a configured target beam, even if it cannot determine a specific beam, and a network device transmits signaling to enable communication using a configured target beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based transmission is used to combat high-frequency channel attenuation, then signal coverage is improved, but device complexity increases due to the need for beam determination mechanisms
Solution Approach 1:
The network device pre-configures multiple candidate target beams and their corresponding spatial relations before actual communication transmission. The terminal device receives and stores these configurations in advance, so when beam determination is needed, it can quickly select from pre-configured options rather than performing complex real-time beam searching, thus improving signal coverage while reducing determination complexity.
Solution Approach 2:
The patent introduces spatial relation information as an intermediary parameter that links reference signals (RS) with target beams. Instead of directly determining target beams through complex measurements, the terminal uses spatial relation configurations to infer appropriate beams, simplifying the beam determination process while maintaining reliable signal coverage.
2Loss of information
If common beams are not indicated in signaling to reduce overhead, then loss of information decreases, but terminal devices cannot determine beams for adequate coverage
Solution Approach 1:
The patent extracts the beam indication function from explicit common beam signaling and relocates it to spatial relation configurations associated with reference signals. By separating beam determination from direct indication, the system reduces signaling overhead while maintaining coverage capability through implicit beam selection based on pre-configured spatial relations.
Solution Approach 2:
The terminal device autonomously determines target beams by selecting from pre-configured candidate beams based on spatial relation information, without requiring explicit common beam indications from the network. This self-service mechanism reduces signaling overhead while ensuring adequate coverage through intelligent beam selection.
3Measurement precision
If explicit beam indication is provided for every transmission, then measurement precision of beam selection is improved, but signaling overhead increases
Solution Approach 1:
The spatial relation configuration serves multiple functions: it defines reference signal parameters, establishes spatial relationships, and implicitly indicates target beams. This multi-functionality allows the system to maintain precise beam selection without requiring separate explicit beam indications for each transmission, thereby reducing signaling overhead while preserving measurement precision.
Data Source
AI summary
A method for determining a beam, performed by a terminal device, includes: receiving a first signaling from a network device, the first signaling for determining a scheduled communication transmission or reception; determining the scheduled communication transmission or reception; and performing the communication transmission or reception using a configured target beam in response to being incapable of determining a beam corresponding to the communication transmission or reception.