Flexible PUCCH Resource Allocation for TDD-FDD Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently managing HARQ bits and resource allocation in TDD-FDD joint carrier aggregation, leading to suboptimal throughput and latency due to rigid HARQ timing and resource configuration.
Innovation Solution
Implementing flexible PUCCH resource allocation and HARQ timing strategies, allowing for multiple PUCCH configurations and subframe-specific resource block allocations, enabling efficient use of resources and reducing latency by aligning HARQ bit transmissions with FDD and TDD carrier schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rigid HARQ timing and resource configuration are used in TDD-FDD joint carrier aggregation, then system complexity is reduced, but throughput and latency performance deteriorate
Solution Approach 1:
The patent implements dynamic HARQ timing and PUCCH resource allocation that adapts to TDD and FDD carrier configurations. The system dynamically selects HARQ timing relationships and PUCCH resource blocks based on the specific carrier aggregation scenario, enabling flexible adjustment of timing parameters and resource assignments to optimize throughput while managing complexity through structured adaptation rules
Solution Approach 2:
The patent changes key parameters including HARQ timing offsets, PUCCH resource block assignments, and subframe configurations based on the TDD-FDD carrier aggregation mode. By adjusting these parameters dynamically according to traffic conditions and carrier properties, the system achieves improved throughput and latency performance without requiring complete system redesign
2Loss of time
If flexible PUCCH resource allocation and multiple PUCCH configurations are implemented, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent segments PUCCH resource allocation into multiple configurations, each optimized for specific TDD or FDD carrier scenarios. By dividing the resource allocation into distinct configurations (e.g., first PUCCH configuration for TDD carrier, second PUCCH configuration for FDD carrier), the system reduces latency for each specific case while managing overall complexity through modular organization of allocation rules
Solution Approach 2:
The patent establishes preliminary PUCCH resource configurations and HARQ timing relationships in advance for different carrier aggregation scenarios. By pre-defining resource blocks and timing parameters for various TDD-FDD combinations, the system minimizes latency during actual operation while maintaining manageable complexity through structured preconfiguration
3Productivity
If subframe-specific resource block allocations are used, then radio resource utilization efficiency is improved, but configuration complexity increases
Solution Approach 1:
The patent applies subframe-specific resource block allocations where different resource blocks are assigned to different subframes based on TDD or FDD carrier requirements. By optimizing resource allocation locally for each subframe rather than using uniform allocation, the system improves radio resource utilization efficiency while managing configuration complexity through pattern-based allocation rules
Data Source
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Figure 2
Figure 4A
AI summary
In some implementations, a method in a user equipment (UE) for supporting time division duplex (TDD) and frequency division duplex (FDD) joint carrier aggregation (CA) includes receiving a Physical Uplink Control Channel (PUCCH) resource allocation from an evolved NodeB (eNB). The PUCCH resource allocation includes a first PUCCH configuration for a first subframe and a second PUCCH configuration for a second subframe, and the second PUCCH configuration is different than the first PUCCH configuration. The UE transmits a first group of Hybrid Automatic Repeat reQuest (HARQ) bits based on the first PUCCH configuration in the first subframe. The UE transmits a second group of HARQ bits based on the second PUCCH configuration in the second subframe.