HARQ Feedback Request Mechanism for Uplink Resource Efficiency
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Solution Overview
Problem
In uplink Hybrid Automatic Repeat Request (HARQ) transmission, especially in asynchronous adaptive systems like 5G, User Equipment (UE) faces challenges in acquiring feedback from the base station when authorization is stopped, leading to inefficiencies and resource wastage.
Innovation Solution
A method and device for HARQ feedback where a terminal device sends feedback request information to the network device if no feedback is received within a target time period, allowing the UE to continue acquiring feedback even if the base station stops authorizing it, using dedicated or common resources, and determining the time length based on round-trip time or feedback information timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station stops authorizing the UE for uplink transmission, then the downlink control channel resources are saved and network resource utilization is improved, but the UE loses feedback from the base station and cannot determine whether to perform new transmission or retransmission
Solution Approach 1:
The patent introduces a feedback request mechanism where the UE can actively request feedback information from the base station by sending a feedback request on the uplink. The base station responds to this request by providing the feedback information, ensuring the UE can determine whether to perform new transmission or retransmission even when authorization is stopped. This resolves the information loss problem while maintaining network resource efficiency.
2Reliability
If the UE continuously monitors for feedback information, then the UE can acquire feedback even when authorization is stopped, but uplink signaling overhead and energy consumption increase
Solution Approach 1:
The patent implements a timer-based mechanism where the UE starts a timer when uplink authorization is stopped. When the timer expires and no feedback is received, the UE sends a feedback request. This preliminary timing action ensures the UE doesn't continuously monitor for feedback, reducing energy consumption while still reliably acquiring feedback information when needed.
3Reliability
If the UE sends feedback request information using dedicated resources, then the feedback request can be sent reliably, but the device complexity and resource allocation overhead increase
Solution Approach 1:
The patent allows feedback requests to be sent using either dedicated resources allocated by the base station or common resources shared by multiple UEs. This multi-functionality approach provides flexibility: dedicated resources ensure reliable transmission for specific UEs when needed, while common resources reduce device complexity and overhead for general feedback requests, accommodating different network conditions and UE requirements.
Data Source
AI summary
A method and device for hybrid automatic repeat request feedback are provided. The method includes: a terminal device sends data to be transmitted to a network device; if the terminal device determines that feedback information for the data to be transmitted is not received in a first target time period, the terminal device sends feedback request information to the network device, the feedback request information is used for requesting the network device to send feedback information for the data to be transmitted, a start time point of the first target time period is a time point that the terminal device finishes sending the data to be transmitted, and a time length of the first target time period is a first time length.