Terminal Device Selective Fourier Transform for Wireless Latency
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Solution Overview
Problem
Current cellular communication systems face challenges in reducing wireless communication latency, particularly due to interference from signals transmitted on different frequency resources during time division duplex (TDD) operations, which can lead to prolonged data transmission periods and signal interference.
Innovation Solution
A terminal device is configured to execute Fourier transform processing only on a specific frequency resource, excluding other resources within a predetermined frequency band to minimize interference, allowing for separate allocation of timeslots for uplink and downlink communications and using band-limiting filters to suppress unwanted signal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Fourier transform processing is executed on the entire predetermined frequency band, then all signals within the band are processed, but processing time increases and latency is prolonged
Solution Approach 1:
The frequency band is segmented into multiple frequency resources (first frequency resource for base station signals, second frequency resource for terminal device signals). The reception processing is segmented to apply Fourier transform only to the first frequency resource, excluding the second frequency resource. This segmentation allows selective processing of only necessary signals, reducing overall processing time while maintaining signal reception quality for the intended communications.
2Reliability
If timeslots are allocated for uplink and downlink communications sequentially, then interference between directions is reduced, but communication latency increases due to waiting for allocated timeslots
Solution Approach 1:
The patent transitions from time-division multiplexing (sequential uplink/downlink timeslots) to frequency-division multiplexing by allocating different frequency resources for different communication directions. Uplink and downlink communications can occur simultaneously on different frequency resources (first and second frequency resources), eliminating the need to wait for allocated timeslots while maintaining signal quality through frequency separation.
3Adaptability or versatility
If signals from multiple frequency resources are processed together, then comprehensive signal reception is achieved, but interference between signals increases
Solution Approach 1:
The patent extracts and separates signals from different frequency resources into distinct processing paths. Signals from the first frequency resource (base station to terminal) and second frequency resource (terminal to base station) are processed separately through dedicated reception processing. This extraction eliminates mutual interference between uplink and downlink signals while maintaining the ability to receive and process both signal types independently.
Data Source
AI summary
A terminal device, which is configured to execute reception processing including Fourier transform targeting a range of a predetermined frequency band on a received signal, execute, in a case where a signal transmitted from a base station device with a first frequency resource and a signal transmitted from another terminal device with a second frequency resource are included in the range of the predetermined frequency band, control to execute the reception processing including the Fourier transform on the first frequency resource and to not execute the reception processing including the Fourier transform on the second frequency resource.