Dynamic HARQ Mapping for Carrier Aggregation Interference
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Solution Overview
Problem
Wireless networks face congestion due to increased data transmission demands, particularly in high-density areas, leading to bandwidth limitations and interference issues in licensed spectrum usage.
Innovation Solution
Carrier aggregation technology is employed, allowing multiple component carriers to be aggregated to form a virtual wideband channel, enabling efficient use of available bandwidth through symmetric or asymmetric configurations and inter-band carrier aggregation, which supports different uplink and downlink configurations to reduce interference and enhance data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to increase bandwidth, then data throughput is improved, but system complexity increases due to multiple component carriers
Solution Approach 1:
The patent segments the HARQ-ACK feedback for different component carriers into separate PUCCH transmissions or separate resource allocations within the same PUCCH. This segmentation allows the system to handle multiple component carriers independently, managing the complexity of carrier aggregation by treating each carrier's HARQ feedback separately rather than as a monolithic block.
Solution Approach 2:
The patent introduces a new dimension for resource allocation by using PUCCH resource indicators (ARI) carried in downlink assignments to dynamically allocate PUCCH resources. This adds a temporal and resource-dimension to the already frequency-dimensioned carrier aggregation, allowing flexible management of multiple carriers without increasing base structural complexity.
2Quantity of substance
If multiple component carriers are aggregated, then available bandwidth increases, but interference management becomes more difficult
Solution Approach 1:
The patent uses PUCCH resource indicators (ARI) as an intermediary mechanism carried in downlink assignments to coordinate HARQ-ACK resource allocation across multiple component carriers. This intermediary allows the system to manage interference by providing controlled, indicator-based resource allocation that prevents random collisions and enables coordinated resource usage across aggregated carriers.
Solution Approach 2:
The patent dynamically changes PUCCH resource parameters (time-frequency resources, cyclic shifts) based on ARI values received in downlink assignments. This parameter adaptation allows the system to adjust resource allocation in response to channel conditions and interference levels, optimizing performance across multiple aggregated carriers by varying transmission parameters rather than using fixed allocations.
3Productivity
If dynamic HARQ mapping is implemented, then resource utilization efficiency improves, but processing complexity increases
Solution Approach 1:
The patent implements self-service through autonomous HARQ-ACK resource determination, where the UE automatically selects PUCCH resources based on ARI indicators received in downlink assignments without requiring complex centralized scheduling. This self-service approach allows dynamic resource allocation while keeping processing complexity manageable by using simple indicator-based lookup rather than complex optimization algorithms.
Solution Approach 2:
The patent uses parameter changes in PUCCH resource allocation based on ARI values to achieve dynamic resource utilization. By changing resource parameters (time slots, frequency resources, cyclic shifts) according to received indicators, the system achieves high resource utilization efficiency through simple parameter adaptation rather than complex real-time optimization, balancing efficiency gains with processing complexity.
Data Source
AI summary
Technology to dynamically alter hybrid automatic retransmission re-quest (HARQ) mapping for carrier aggregation (CA) is disclosed. In an example, a user equipment (UE) operable to dynamically alter hybrid automatic retransmission re-quest (HARQ) mapping for carrier aggregation (CA) can include computer circuitry configured to: Determine a secondary HARQ bundling window size for a secondary cell (SCell), when a primary HARQ bundling window size for a primary cell (PCell) is zero; determine a physical uplink control channel (PUCCH) resource for transmission of a HARQ-ACKnowledge (ACK) feedback using the secondary HARQ bundling window size; and transmit the HARQ-ACK feedback in the PUCCH resource.