Uplink HARQ Feedback Mode Switching for Coverage Gaps
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Solution Overview
Problem
In heterogeneous network systems, uplink and downlink separation technologies lead to conflicts when a terminal is not within the downlink coverage of the uplink serving node, causing HARQ mechanisms to fail due to inability to receive feedback messages, resulting in resource conflicts and failed retransmissions.
Innovation Solution
A method where a wireless communication node determines if a terminal is within downlink coverage and instructs it to use a non-feedback mode or the uplink serving node to use a non-feedback mode, preventing retransmissions and resource conflicts by ensuring the HARQ mechanism functions correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink and downlink separation technology is used to maximize downlink signal received power and minimize uplink path loss, then uplink coverage and downlink coverage can be optimized, but HARQ feedback mechanism fails when terminal is not within downlink coverage of uplink serving node
Solution Approach 1:
The patent introduces a dynamic judgment mechanism that determines whether the terminal is within downlink coverage of the uplink serving node based on real-time signal strength measurements. The system dynamically switches between feedback modes (feedback mode and non-feedback mode) according to the terminal's location, allowing the HARQ mechanism to adapt to changing coverage conditions and maintain reliability across different mobility scenarios.
2Reliability
If terminal uses feedback mode for uplink data transmission, then data reliability is improved through HARQ mechanism, but resource conflicts occur when terminal retransmits using time-frequency resource allocated to another terminal
Solution Approach 1:
The patent applies preliminary action by having the terminal first determine whether it is within downlink coverage of the uplink serving node before initiating uplink data transmission. Based on this preliminary judgment, the terminal selects the appropriate feedback mode in advance. This prevents subsequent resource conflicts by ensuring the terminal only uses feedback mode when it can reliably receive HARQ feedback, thus avoiding unnecessary retransmissions that would cause resource conflicts with other terminals.
3Reliability
If terminal continuously retransmits uplink data without receiving HARQ feedback, then data transmission reliability is maintained, but time consumption increases and resource conflicts occur
Solution Approach 1:
The patent implements a feedback mechanism where the terminal receives HARQ feedback information from the uplink serving node and adjusts its transmission behavior accordingly. When the terminal is within downlink coverage, it receives feedback and stops retransmission upon successful delivery. When the terminal is out of downlink coverage, the system switches to non-feedback mode, preventing continuous retransmission and avoiding time waste. This feedback loop optimizes both reliability and time efficiency by eliminating unnecessary retransmissions.
Data Source
AI summary
Embodiments of the present invention relate to the communications field, and disclose a method for uplink data transmission, a terminal, and a wireless communication node, which can ensure that a HARQ mechanism between a terminal and a wireless communication node works normally. The method includes: determining, by a first wireless communication node, whether a terminal is within downlink coverage of a second wireless communication node; and when the first wireless communication node determines that the terminal is not within the downlink coverage of the second wireless communication node, instructing, by the first wireless communication node, the terminal to use a non-feedback mode; and/or instructing, by the first wireless communication node, the second wireless communication node to use a non-feedback mode.