Non-Overlapping Sub-Band Full Duplex Collision Handling
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Solution Overview
Problem
Current 5G NR wireless systems face challenges in achieving optimal performance for uplink communication in Time Division Duplex (TDD) mode due to limited time duration allocation, resulting in reduced coverage and increased latency.
Innovation Solution
The implementation of Non-Overlapping Sub-Band Full Duplex (NOSB-FD) communication, where downlink and uplink symbols coexist within the same carrier bandwidth, allowing for simultaneous transmission and reception in specific symbols, and configuring user equipment (UE) to handle resource collisions through dynamic scheduling and priority management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Time Division Duplex (TDD) is used to allocate time domain resources between downlink and uplink, then the system can maintain simple structure and ease of operation, but uplink coverage is reduced and latency increases due to limited time duration allocation
Solution Approach 1:
The patent segments the carrier bandwidth into multiple subbands, allowing different subbands to operate in different duplex modes (FDD or TDD). This enables uplink subbands to be allocated in frequency domain rather than time domain, providing dedicated uplink resources without limiting the overall time duration for uplink communication, thus improving coverage and reducing latency while maintaining TDD simplicity in other subbands.
Solution Approach 2:
The patent transitions from time-domain resource allocation (TDD) to frequency-domain resource allocation by introducing uplink subbands within the carrier bandwidth. This dimensional change allows simultaneous downlink and uplink operations in different frequency portions, effectively adding a frequency dimension to resource allocation and enabling full-duplex like performance while maintaining TDD operational simplicity.
2Reliability
If full duplex communication is implemented to enable simultaneous downlink and uplink transmission, then uplink performance is improved with better coverage and reduced latency, but system complexity increases due to collision handling and resource management challenges
Solution Approach 1:
The patent divides the carrier bandwidth into multiple subbands with distinct functions: downlink subbands, uplink subbands, and flexible subbands. This segmentation eliminates resource collisions by assigning dedicated frequency resources to each direction, removing the need for complex collision handling mechanisms while enabling simultaneous downlink and uplink operations.
Solution Approach 2:
The patent introduces flexible subbands that can dynamically switch between downlink and uplink configurations based on traffic demands. This dynamic reconfigurability allows the system to adapt to varying uplink/downlink traffic ratios without permanent resource dedications, maintaining full-duplex performance while simplifying resource management through standardized switching mechanisms.
3Reliability
If uplink time duration is increased in TDD to improve coverage and reduce latency, then uplink performance is enhanced, but downlink time duration is reduced and overall system productivity is affected
Solution Approach 1:
The patent introduces frequency-domain allocation of uplink resources through uplink subbands, transitioning from purely time-domain resource allocation to a two-dimensional approach (time and frequency). This allows uplink communication to occur simultaneously with downlink in different frequency portions, effectively increasing uplink capacity without reducing downlink time duration, thus maintaining overall system productivity while improving uplink coverage and reducing latency.
Solution Approach 2:
The patent creates flexible subbands that can serve multiple functions - operating as downlink subbands when downlink traffic is heavy, switching to uplink subbands when uplink traffic dominates, or being used for other purposes like carrier aggregation. This multi-functionality ensures optimal utilization of all frequency resources regardless of traffic patterns, maintaining high overall system productivity while providing dedicated uplink resources when needed.
Data Source
AI summary
A user equipment (UE) configured for operation in a fifth-generation new radio (5G NR) network may decode resource configuration information received from a generation Node B (gNB) for Non-Overlapping Sub-Band Full Duplex (NOSB-FD) communication. The resource configuration information may indicate downlink symbols within a carrier bandwidth for downlink communication, uplink symbols within the carrier bandwidth for uplink communication, and NOSB-FD symbols within the carrier bandwidth. Each NOSB-FD symbol may be configurable for both uplink and downlink communication. For any one of the NOSB-FD symbols, one or more uplink subbands within the carrier bandwidth may be configurable to be allocated for uplink communication and one or more downlink subbands of the carrier bandwidth may be configurable to be allocated for downlink communication. The resource configuration information may be determined from a mapping of physical resource blocks (PRBs) to a common resource block (CRB) grid.