SBFD Downlink Reception with Uplink Subband Multiplexing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing radio resources based on different numerologies to meet the diverse requirements of enhanced mobile broadband, massive machine-type communication, and ultra-reliable and low-latency communication scenarios in next-generation radio access technology (NR).
Innovation Solution
The implementation of subband full duplex (SBFD) symbols, where uplink subbands are configured within downlink slots or symbols, allowing simultaneous downlink transmission and uplink reception using separate frequency resources, enhances the flexibility and efficiency of downlink transmission/reception in full-duplex communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink transmission and uplink reception are performed in the same time slot using frequency division, then resource utilization efficiency is improved, but self-interference between uplink and downlink signals deteriorates reception quality
Solution Approach 1:
The frequency band is segmented into multiple subbands, with specific subbands allocated for uplink transmission and others for downlink reception within the same time slot. This frequency-domain segmentation enables full-duplex operation by spatially separating uplink and downlink signals in the frequency spectrum, thereby improving resource utilization while managing self-interference through selective subband assignment
Solution Approach 2:
Different subbands are assigned different functional qualities - some subbands are optimized for uplink transmission while others are optimized for downlink reception. This local quality differentiation within the frequency spectrum allows simultaneous uplink and downlink operations with reduced interference, as each subband is tailored to its specific communication direction
2Adaptability or versatility
If flexible frame structures are designed to meet diverse scenario requirements, then adaptability to different usage scenarios is improved, but system complexity increases
Solution Approach 1:
The frame structure is designed to be dynamic and configurable, allowing the network to adaptively allocate time slots and frequency subbands based on real-time traffic demands and scenario requirements. This dynamic configuration enables the system to switch between different numerologies and full-duplex modes as needed, achieving high adaptability while managing complexity through standardized configuration mechanisms
Solution Approach 2:
The downlink slot structure is designed to serve multiple functions - it can simultaneously support downlink data transmission, uplink reception in specific subbands, and flexible adaptation to different numerologies. This multi-functional design allows a single frame structure to cater to diverse usage scenarios including eMBB, mMTC, and URLLC, reducing the need for multiple specialized structures
Data Source
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AI summary
Provided is a method of a user equipment (UE) to perform downlink reception in full-duplex communication. The method may include receiving configuration information about a downlink slot or a downlink symbol, receiving downlink resource allocation information including information about allocated frequency resources in the downlink slot or the downlink symbol, and performing downlink reception on the basis of the downlink resource allocation information, wherein the downlink slot or the downlink symbol includes an SBFD symbol in which uplink sub-bands for full-duplex communication are configured, and the frequency resources include frequency resources set as the uplink sub-bands.