Carrier Aggregation SBFD Patterns for Cross-Link Interference Control
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Solution Overview
Problem
Current wireless communications systems do not support sub-band full duplex (SBFD) configuration in carrier aggregation, limiting efficient communication between user equipment (UE) and network entities.
Innovation Solution
Configuring multiple component carriers (CCs) with a joint SBFD operation, allowing for no more than one uplink sub-band across the CCs, and enabling SBFD patterns that include downlink sub-bands across the CCs, with UEs determining cross-link interference measurements and handling collisions between uplink and downlink grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to support multiple component carriers, then communication capacity and data throughput are improved, but system complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the frequency spectrum into multiple component carriers (CCs) that can be independently configured and managed. Each CC is divided into sub-bands that can be assigned different duplex modes (FDD or TDD), allowing granular control over interference and resource allocation while maintaining high aggregate throughput across multiple carriers.
Solution Approach 2:
The patent introduces a new dimension of control by enabling different duplex modes (FDD/TDD) and different SBFD configurations across multiple CCs simultaneously. This multi-dimensional resource allocation allows the system to optimize for both capacity and complexity management by selecting appropriate configurations for each carrier based on channel conditions and interference patterns.
2Productivity
If sub-band full duplex operation is implemented across multiple component carriers, then data throughput and spectral efficiency are improved, but cross-link interference and signal quality deteriorate
Solution Approach 1:
The patent applies local quality by allowing different sub-bands within the same or different CCs to have different duplex configurations. Specifically, certain sub-bands can be configured as uplink while adjacent sub-bands are configured as downlink, enabling simultaneous full-duplex operation in different frequency regions. This localized configuration minimizes cross-link interference by spatially separating uplink and downlink transmissions in the frequency domain while maximizing spectral efficiency.
Solution Approach 2:
The patent converts the potential harmful effect of cross-link interference into a benefit by using interference measurement and coordination mechanisms. The system measures cross-link interference between SBFD operations on different CCs and uses this information to adjust resource allocation, power control, and scheduling decisions, thereby transforming the interference problem into an optimization opportunity for overall system performance.
3Productivity
If multiple uplink sub-bands are configured across component carriers, then uplink capacity is improved, but interference management and coordination difficulty increase
Solution Approach 1:
The patent implements dynamic interference management through coordinated scheduling between network entities serving different CCs. The system dynamically adjusts uplink resource allocation, power levels, and timing based on real-time interference measurements and channel conditions. This dynamic coordination allows multiple uplink sub-bands to operate simultaneously across CCs while maintaining manageable interference levels through adaptive resource management.
Data Source
AI summary
Aspects of sub-band full duplex (SBFD) configuration in carrier aggregation are described. In some examples, a network entity may output respective carrier aggregation configurations to a set of user equipments (UEs), and the respective carrier aggregation configurations may configure multiple component carriers for communication by the set of UEs. The network entity may output, to the set of UEs, respective SBFD configurations for SBFD operation across the multiple component carriers, and the respective SBFD configurations may include an SBFD pattern for the multiple component carriers. The SBFD pattern may include no more than one uplink sub-band across the multiple component carriers. The network entity may communicate one or more messages with the set of UEs in accordance with the respective SBFD configurations and the respective carrier aggregation configurations.