HARQ Feedback Bundling for Wireless Uplink Resource Efficiency
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Solution Overview
Problem
The increasing data traffic and frequency shortage in cellular systems, particularly in millimeter wave bands, necessitate efficient beamforming technologies and new scheduling methods to manage HARQ operations while minimizing uplink resource overhead and latency in next-generation cellular systems.
Innovation Solution
A method for bundling HARQ feedback in wireless communication systems, where terminals and base stations use RRC signaling to determine the number of subframes and feedback information size, allowing for efficient transmission and reception of HARQ feedback, even with limited beams and latency constraints, by configuring HARQ feedback bundling sequences and delay offsets to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming technology is used to secure coverage in millimeter wave bands, then coverage and signal quality are improved, but the number of beams that can be transmitted simultaneously is limited, causing increased latency and resource overhead
Solution Approach 1:
The patent combines multiple HARQ feedback bits into a single uplink transmission by bundling them together. The base station transmits downlink data across multiple subframes using different beams, and the terminal bundles the HARQ feedback for all these subframes into one uplink transmission, reducing the number of separate uplink transmissions needed and thereby reducing latency and resource overhead while maintaining reliable feedback for each beam
Solution Approach 2:
The patent configures HARQ feedback bundling parameters in advance through RRC signaling before actual data transmission occurs. The base station pre-configures the terminal with parameters such as the number of subframes for bundling and feedback information size, allowing the terminal to efficiently bundle feedback without real-time negotiation, thus reducing latency and signaling overhead during actual data transmission
2Measurement precision
If the number of HARQ feedback bits is increased to provide detailed feedback for each subframe, then feedback precision is improved, but uplink resource overhead increases
Solution Approach 1:
The patent merges multiple HARQ feedback bits from different subframes into a single bundled feedback transmission. Instead of transmitting separate feedback for each subframe, the terminal bundles all feedback bits together and transmits them in one uplink message, thereby maintaining comprehensive feedback precision while significantly reducing uplink resource overhead
Solution Approach 2:
The patent allows flexible configuration of feedback information size through RRC signaling, enabling the system to transmit only the necessary amount of feedback information based on actual needs. This partial action approach transmits sufficient feedback precision without the excessive overhead of transmitting all possible feedback bits in every scenario
3Productivity
If dynamic TDD is used to increase radio resource efficiency, then resource efficiency is improved, but HARQ operation complexity increases due to varying subframe configurations
Solution Approach 1:
The patent creates a universal HARQ feedback bundling mechanism that works across different TDD configurations. The RRC signaling configures parameters that are applicable regardless of the specific TDD uplink-downlink configuration, allowing the same bundling procedure to handle HARQ feedback for downlink subframes in various dynamic TDD scenarios, thereby managing complexity while maintaining resource efficiency
Solution Approach 2:
The patent uses RRC signaling to dynamically configure HARQ feedback bundling parameters such as the number of subframes for bundling and feedback information size based on current TDD configuration and traffic conditions. This parameter adaptation allows the system to optimize HARQ operations for each specific dynamic TDD scenario without requiring complex dedicated procedures for each configuration
Data Source
AI summary
Provided are an HARQ operation procedure and control method between a terminal and a base station. In the method, the terminal receives HARQ feedback bundling control information from the base station through RRC signaling and downlink control information (DCI), bundles HARQ feedbacks in response to reception results of one or more pieces of downlink data according to the HARQ feedback bundling control information, and transmits the bundled HARQ feedbacks. The base station extracts effective information from the HARQ feedback information on the basis of transmission subframe information and checks whether the terminal receives the downlink data, thereby enabling the terminal to transmit the HARQ feedbacks while minimizing uplink resources, and the base station to perform an HARQ operation by checking whether downlink data in each subframe has been successfully transmitted.