Soft HARQ Feedback Configuration for Link Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring hybrid automatic repeat request (HARQ) feedback, particularly in determining the type of HARQ feedback to transmit based on priority indicators, which affects link adaptation and reliability in 5G and LTE networks.
Innovation Solution
The method involves receiving a downlink communication with priority indicators to trigger either soft or non-soft HARQ feedback, where soft HARQ feedback includes information for link adaptation, enabling the user equipment (UE) or base station to transmit appropriate HARQ feedback based on the priority, ensuring reliable communication by adapting to network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft HARQ feedback is transmitted for all transmissions, then link adaptation performance is improved, but uplink feedback resources and overhead increase
Solution Approach 1:
The patent applies local quality by differentiating HARQ feedback types based on transmission priority. High priority transmissions receive soft HARQ feedback with detailed information for link adaptation, while low priority transmissions use non-soft HARQ feedback with reduced information. This selective approach optimizes uplink feedback resources by allocating detailed feedback only where necessary for critical transmissions.
Solution Approach 2:
The patent segments HARQ feedback into two distinct types: soft HARQ feedback for high priority transmissions and non-soft HARQ feedback for low priority transmissions. This segmentation allows the system to manage feedback resources efficiently by matching the level of feedback detail to the priority level of each transmission.
2Productivity
If priority indicators are introduced to differentiate HARQ feedback types, then feedback efficiency is improved, but downlink control information complexity increases
Solution Approach 1:
The patent merges the priority indication function into existing downlink control information structures by utilizing the priority indicator bit field already present in DCI formats. This integration approach avoids adding separate signaling mechanisms and leverages existing control information frameworks to convey HARQ feedback type requirements.
3Reliability
If soft HARQ feedback is used for high priority transmissions, then communication reliability is improved, but processing complexity at UE increases
Solution Approach 1:
The patent implements dynamic HARQ feedback type selection at the UE based on the priority indicator received in downlink control information. The UE dynamically adjusts its feedback generation and processing behavior according to transmission priority, generating detailed soft feedback only for high priority transmissions and simplified feedback for low priority transmissions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink communication including a priority indicator indicating that a first priority for a received transmission is to trigger hybrid automatic repeat request (HARQ) feedback of a first type of HARQ feedback or indicating that a second priority for the received transmission is to trigger HARQ feedback of a second type of HARQ feedback, the first type of HARQ feedback including information associated with link adaptation, the information not included in the second type of HARQ feedback. The UE may transmit the HARQ feedback, as a response to the received transmission, based at least in part on receiving the downlink communication and in accordance with whether the first type of HARQ feedback or the second type of HARQ feedback is triggered. Numerous other aspects are provided.