In-band Duplex Communication Using Subband Segmentation
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Solution Overview
Problem
The existing FDD and TDD duplex modes in wireless communication systems operate independently, limiting spectrum utilization ratio and network performance, necessitating a new duplex mode that combines their advantages to enhance 5G spectrum utilization and network performance.
Innovation Solution
An in-band duplex communication method where uplink and downlink control channels are transmitted in separate subbands of un-paired spectrum, with uplink and downlink data transmitted in a time division multiplexing manner in a third subband, utilizing guard bands to reduce interference and employing filtered or filter-bank multicarrier modulation to optimize spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FDD mode is used for duplex communication, then uplink and downlink can transmit simultaneously using paired frequency resources, but spectrum utilization ratio is limited due to requirement of paired spectrum bands
Solution Approach 1:
The patent segments the available unpaired spectrum into multiple subbands, with odd-numbered subbands used for downlink control channels and even-numbered subbands used for uplink control channels. This segmentation allows simultaneous bidirectional control channel transmission without requiring paired spectrum bands, thereby improving spectrum utilization while maintaining reliable simultaneous transmission.
Solution Approach 2:
The patent transitions from traditional frequency-domain separation (FDD) to a hybrid approach combining frequency subband division with time-division multiplexing for data channels. By introducing this dimensional change in resource allocation, the system achieves both simultaneous control channel transmission and flexible data channel scheduling without being constrained by paired spectrum requirements.
2Adaptability or versatility
If TDD mode is used for duplex communication, then spectrum utilization ratio is improved by sharing unpaired frequency resources, but uplink and downlink cannot transmit simultaneously due to time-division multiplexing
Solution Approach 1:
The patent segments the spectrum into multiple subbands and assigns different directions (uplink/downlink) to different subbands for control channel transmission. This allows simultaneous bidirectional control channel transmission in different subbands, overcoming the TDD limitation of sequential transmission while maintaining the benefit of using unpaired spectrum bands.
Solution Approach 2:
The patent implements dynamic resource allocation where the data channels in even-numbered subbands can be flexibly configured for uplink or downlink transmission based on traffic demands. This dynamic approach combines the simultaneous transmission capability of FDD with the flexible spectrum utilization of TDD, adapting to different service requirements in real-time.
3Reliability
If guard bands are inserted between subbands to reduce interference, then interference between adjacent subbands is reduced, but spectrum efficiency decreases due to occupied frequency resources
Solution Approach 1:
The patent employs filtered or filter-bank multicarrier modulation techniques that improve the spectral confinement of signals. This parameter change in modulation approach reduces out-of-band leakage and adjacent channel interference, allowing for narrower guard bands or even elimination of guard bands, thereby improving spectrum efficiency while maintaining interference reduction.
Solution Approach 2:
The patent replaces the traditional mechanical approach of inserting guard bands (frequency resources set to zero) with a signal processing approach using filtered or filter-bank multicarrier modulation. This substitution uses digital signal processing techniques to achieve interference reduction without sacrificing spectrum resources, thereby improving spectrum efficiency while maintaining reliable interference suppression.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A bidirectional communication method and an apparatuses thereof are provided. An uplink control channel and a downlink control channel are respectively transmitted in a first subband and a third subband of an available un-paired spectrum, wherein control channels of reverse directions are transmitted at the same time in the first subband and the third subband, and uplink data and downlink data are transmitted in a time division multiplexing manner in a second subband of the available un-paired spectrum, wherein the first subband and the third subband are on the two ends of the available un-paired spectrum.