Sub-band full duplex signaling for cellular networks
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Solution Overview
Problem
Current methods for implementing Sub-Band Full Duplexing (SBFD) in cellular networks face challenges such as signal collisions, inefficient resource configuration, and limitations in dynamic TDD configuration, which hinder spectral efficiency and data throughput.
Innovation Solution
The method involves advanced signaling techniques, including dynamic configuration of UE-specific TDD operations, new rate matching patterns, and flexible resource allocation to enable SBFD in overlapping sub-bands, allowing for simultaneous DL and UL operations while avoiding collisions and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Sub-Band Full Duplexing is implemented with overlapping sub-bands, then spectral efficiency and data throughput are improved, but signal collisions and interference between DL and UL operations occur
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, allowing different sub-bands to be allocated for DL and UL operations simultaneously. This segmentation enables full duplex operation by dividing the frequency resource into independent segments that can be managed separately, thus improving spectral efficiency while avoiding collisions through proper sub-band allocation
Solution Approach 2:
The patent applies local quality by configuring different TDD operations for different sub-bands within the same cell. Each sub-band can have its own DL-UL configuration, allowing localized optimization where some sub-bands operate in DL mode, others in UL mode, and some in flexible mode, thereby enabling full duplex operation without causing system-wide interference
2Adaptability or versatility
If dynamic TDD configuration is used for SBFD, then resource allocation flexibility is improved, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent introduces a new dimension of configuration by extending TDD-UL-DL-ConfigDedicated to include sub-band specific parameters such as frequencyStart, frequencyLength, and dlUlConfig. This dimensional extension allows dynamic configuration of TDD operations at the sub-band level without requiring complete reconfiguration of the entire system, thereby improving flexibility while managing complexity through structured parameter organization
Solution Approach 2:
The patent implements dynamic TDD configuration that can be changed via RRC signaling, allowing the network to adaptively adjust DL-UL configurations for different sub-bands based on traffic conditions. This dynamic approach enables flexible resource allocation while maintaining manageable complexity through standardized signaling procedures and configuration frameworks
3Ease of operation
If existing rate matching patterns are used for SBFD, then implementation simplicity is maintained, but collision avoidance between CSI-RS and PDSCH or SRS and PUSCH is insufficient
Solution Approach 1:
The patent modifies the rate matching pattern parameters by introducing new fields in TDD-UL-DL-ConfigDedicated that specify which reference signals and channels should be rate-matched around in each sub-band. This parameter change enables the system to maintain implementation simplicity through existing rate matching mechanisms while improving collision avoidance by configuring appropriate rate matching patterns for SBFD-specific scenarios
Data Source
AI summary
A method of signalling in a cellular network is described. The method comprises allocating, by a first node, a first resource to a second node. The method further comprises configuring, by the first node, to perform at least one first operation by the at least one second node in the at least one first resource. The method further comprises configuring, by the first node, a second resource. The method further comprises configuring by the first node, to perform a second operation by the second node in the second resource. The second operation overrides the first operation in an overlapping portion of the first resource and the second resource.