Cross-Division Duplex Sub-Band Allocation for Uplink Capacity
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing resources for simultaneous transmission and reception on the same carrier, leading to suboptimal UL coverage, capacity, and latency in uplink operations.
Innovation Solution
Implementing cross division duplex (XDD) techniques, including sub-band full duplex (SBFD), with dynamic and semi-static SB directional information, and guard band management to optimize resource allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional TDD UL/DL resource allocation is used, then system operation is simple, but uplink coverage and capacity are suboptimal
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands, with different sub-bands allocated for uplink and downlink transmissions simultaneously. This segmentation enables full duplex operation in certain sub-bands while maintaining half-duplex in others, thereby improving uplink capacity without requiring complete system redesign.
Solution Approach 2:
The patent introduces dynamic sub-band full duplex (SBFD) resource allocation where the network can dynamically configure which sub-bands operate in full duplex mode and which operate in half-duplex mode. This dynamic adjustment allows the system to adapt to varying traffic conditions and optimize uplink capacity while managing complexity through flexible configuration.
2Productivity
If simultaneous transmission and reception on the same carrier is implemented, then resource utilization improves, but interference management becomes challenging
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, isolating uplink and downlink transmissions in different frequency regions. This frequency division reduces self-interference and cross-link interference while still enabling simultaneous transmission and reception, thereby improving resource utilization without being overwhelmed by interference management complexity.
Solution Approach 2:
The patent introduces guard bands as intermediary frequency regions between uplink and downlink sub-bands. These guard bands act as buffers that reduce interference between simultaneous uplink and downlink transmissions, enabling full duplex operation while managing interference through frequency domain isolation.
3Productivity
If full duplex operation is deployed, then spectral efficiency increases, but device complexity increases
Solution Approach 1:
The patent enables devices to operate in either half-duplex or full-duplex mode dynamically based on network configuration and traffic conditions. This dynamic operation allows spectral efficiency to increase when full duplex is deployed, while devices can fall back to simpler half-duplex operation when needed, thereby managing the trade-off between spectral efficiency and device complexity.
Solution Approach 2:
The patent applies full duplex operation selectively in specific sub-bands rather than across the entire frequency spectrum. This local application of full duplex in certain sub-bands while maintaining half-duplex in others allows spectral efficiency to improve in targeted regions without requiring all devices to handle the full complexity of omnibus full duplex operation.
4Productivity
If uplink resources are increased, then uplink coverage improves, but feedback latency increases
Solution Approach 1:
The patent enables more frequent uplink transmission opportunities through full duplex operation, where uplink sub-frames can occur more regularly without being constrained by alternating TDD patterns. This periodic uplink transmission improves coverage while maintaining acceptable feedback latency through more frequent transmission cycles.
Data Source
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AI summary
Systems, methods, and apparatuses for cross division duplex (XDD) operation in a wireless communication system are described herein. A user equipment (UE) is configured with one or more sub-bands (SBs) within a larger overall bandwidth (BW) (e.g., represented by a component carrier (CC), a bandwidth part (BWP), etc.), and that use uplink (UL)/downlink (DL) resource allocation(s) that may be different than the larger BW. Configurations for such SB-specific (SBS) arrangements that use guard bands (GBs) between SBs are discussed. Mechanisms for slot format indications (SFIs) within such SBs using either SBS DCI or cross-SB DCI are discussed. Mechanisms for providing SBS uplink resource for initial access (e.g., random access) using at least one initial UL BWP that is configured relative to one or more SBs and that may be used by XDD-capable UEs are discussed.