PUCCH Resource Allocation for HARQ Feedback in Massive Carrier Aggregation
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Solution Overview
Problem
Current mobile communication systems face challenges in accommodating explosive data traffic, increasing transfer rates, managing a large number of connections, achieving low end-to-end latency, and ensuring high energy efficiency, particularly in supporting HARQ ACK/NACK feedback in carrier aggregation systems.
Innovation Solution
A method for defining a PUCCH format for supporting HARQ ACK/NACK in a massive CA system, involving the allocation of uplink resource regions for UCI transmission, using orthogonal cover codes, and multiplexing UCI through different OCC indices and cyclic shifts, while performing Reed-Muller coding and interleaving to efficiently manage control information across multiple cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to accommodate explosive data traffic and increase transfer rates, then system capacity and throughput are improved, but the size of uplink control information (UCI) increases, requiring more uplink resources for feedback transmission
Solution Approach 1:
The patent segments the uplink control information into multiple parts and transmits them through different channels. Specifically, it divides UCI into HARQ-ACK feedback (transmitted on PUCCH) and other control information (transmitted on PUSCH), allowing efficient resource utilization and preventing resource exhaustion from single-channel transmission
Solution Approach 2:
The patent utilizes multiple dimensions for control information transmission: frequency domain (different resource blocks), time domain (different slots), and channel domain (PUCCH and PUSCH). This multi-dimensional approach allows the system to handle increased UCI size from carrier aggregation without proportionally increasing resource consumption
2Productivity
If multiple carrier components are used for carrier aggregation, then data throughput is improved, but the complexity of managing uplink control information across multiple cells increases
Solution Approach 1:
The patent segments control information management by cell groups, where each cell group has its own PUCCH resources. This segmentation allows independent management of control information for different cell groups, reducing the overall complexity of managing control information across multiple carriers
Solution Approach 2:
The patent creates a universal PUCCH resource allocation mechanism that can handle multiple cell groups. The base station can dynamically allocate PUCCH resources for different cell groups using the same resource pool, and the UE can manage feedback for multiple cells through a unified PUCCH structure, reducing management complexity
3Reliability
If uplink resources are allocated for UCI transmission in massive CA systems, then feedback capability is improved, but the available resources for data transmission are reduced
Solution Approach 1:
The patent implements dynamic resource allocation where PUCCH and PUSCH resources are flexibly assigned based on instantaneous needs. The base station can dynamically determine whether to allocate resources for control feedback or data transmission in each subframe, allowing optimal resource utilization that adapts to varying feedback requirements in massive CA systems
Solution Approach 2:
The patent employs periodic feedback transmission where UCI is sent at regular intervals through PUCCH, rather than continuously occupying uplink resources. This periodic approach ensures reliable feedback capability while minimizing the average resource consumption for control information, leaving more resources available for data transmission
Data Source
AI summary
A method of transmitting, by a user equipment (UE), uplink control information (UCI) in a wireless communication system includes receiving, from a base station (BS), physical uplink control channel (PUCCH) resource information for the UCI. Further, the UCI is hybrid automatic repeat request (HARQ) feedback information of multiple downlink cells. The method also includes transmitting, to the BS, the UCI on a PUCCH resource. In addition, the PUCCH resource is mapped to multiple resource block (RB) pairs, the multiple RB pairs include RBs included in a first slot and RBs included in a second slot, the RBs included in the first slot are consecutive RBs to each other, and the RBs included in the second slot are consecutive RBs to each other.