Time-Overlapping Beam-Swept Transmissions for Wireless Links
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Solution Overview
Problem
Beam-swept transmissions in wireless communication systems face significant control signaling overhead due to time multiplexing, making it lengthy to complete multiple beam-swept transmissions, and reducing the number of beams can lead to performance degradation as it becomes difficult to identify the suitable beam.
Innovation Solution
Implementing beam-swept transmissions that are at least partly overlapping in frequency and time with a time offset smaller than the guard interval duration, allowing for efficient determination of antenna weights and reducing latency while maintaining high accuracy in identifying the appropriate beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-swept transmissions are time multiplexed to determine antenna weights for multiple beams, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent merges multiple beam-swept transmissions that were previously executed sequentially in time into a single time slot by overlaying them in the frequency domain. Different beams are transmitted simultaneously on different frequency resources, combining what were separate time-multiplexed operations into a parallel frequency-multiplexed operation, thus reducing total transmission time while maintaining measurement precision
Solution Approach 2:
The patent transitions from time-division multiplexing to frequency-division multiplexing for beam-swept transmissions. By moving the differentiation dimension from time to frequency, multiple beams can be transmitted concurrently without temporal overlap, effectively trading time domain separation for frequency domain separation to reduce latency
2Device complexity
If the number of beams in beam-swept transmissions is reduced to decrease device complexity, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces frequency domain resources as an additional dimension for beam differentiation. Instead of relying solely on temporal sequencing or reducing beam count, the system assigns different frequency resources to different beams, enabling comprehensive beam sweeping across multiple directions without increasing time overhead or device complexity
Solution Approach 2:
The patent makes frequency resources serve multiple functions: they act as both carrier frequencies for data transmission and as unique identifiers for different beams. This multi-functionality allows the system to maintain comprehensive beam coverage while using existing frequency infrastructure, avoiding additional complexity for beam management
3Productivity
If beam-swept transmissions are overlaid in frequency and time, then productivity is improved, but object-generated harmful factors increase due to interference
Solution Approach 1:
The patent segments the frequency spectrum into distinct resources for different beams and introduces orthogonal reference signal sequences. This segmentation ensures that even though transmissions overlap in time, each beam's reference signals are uniquely identifiable through frequency separation and orthogonal coding, preventing interference
Solution Approach 2:
The patent changes the parameters of reference signals by assigning different frequency shifts and orthogonal sequences to different beams. These parameter variations ensure that overlapping transmissions remain distinguishable at the receiver, transforming potential interference into separable signal components through parameter differentiation
Data Source
AI summary
time A method of operating a wireless communication device (101, 102) includes participating in beam-swept transmissions (311-313) of at least one symbol (361-363) on a wireless link (111) between the wireless communication device (101, 102) and a further wireless communication device (101, 102) along multiple beams (501-503), each symbol (361-363) of the at least one symbol including at least one reference signal (152, 391-393). The beam-swept transmissions (311-313) are at least partly overlapping in frequency and time and have a time offset (381) from each other that is smaller than a guard interval duration (356) associated with the at least one symbol (361-363).