HARQ Codebook Feedback Control for Spectral Efficiency
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Solution Overview
Problem
There is a need for improved spectral efficiency in uplink and downlink channels within wireless communication systems, particularly in New Radio (NR) and LTE technology, to enhance mobile broadband access and support various telecommunication standards.
Innovation Solution
The implementation of a user equipment (UE) configured for feedback processing, which includes a processor and memory to receive and transmit feedback based on indications from a base station (BS) regarding downlink transmissions, with options for enabling or disabling HARQ feedback processes to optimize data transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted for all downlink transmissions, then reliability of data transfer is improved, but signaling overhead increases and spectral efficiency deteriorates
Solution Approach 1:
The patent applies partial action by transmitting HARQ feedback selectively rather than for all downlink transmissions. The UE determines whether to transmit HARQ feedback based on whether the downlink transmission was successfully decoded, thereby performing the feedback action only when necessary (when decoding fails) rather than excessively for every transmission.
2Reliability
If HARQ feedback processes are enabled for all downlink transmission occasions, then data transfer reliability is improved, but spectral efficiency deteriorates due to increased feedback transmissions
Solution Approach 1:
The system enables HARQ feedback processes partially by configuring the UE to transmit feedback only when decoding fails. The base station configures HARQ feedback process parameters, and the UE selectively activates feedback transmission based on decoding outcomes, avoiding excessive feedback transmissions that would reduce spectral efficiency.
3Productivity
If flexible feedback processing is implemented, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The UE performs self-service by autonomously determining whether to transmit HARQ feedback based on its own decoding results. The UE compares the received downlink transmission against its decoding capability and independently decides whether feedback transmission is necessary, reducing the need for complex centralized control while improving spectral efficiency.
4Productivity
If HARQ feedback is transmitted selectively based on decoding outcomes, then spectral efficiency is improved, but reliability may deteriorate due to reduced feedback transmissions
Solution Approach 1:
The system implements feedback by having the UE transmit HARQ acknowledgments or negative acknowledgments based on decoding outcomes. When decoding succeeds, the UE sends an acknowledgment; when decoding fails, the UE sends a negative acknowledgment triggering retransmission. This feedback mechanism maintains reliability while improving spectral efficiency by avoiding unnecessary feedback transmissions.
Data Source
AI summary
Certain aspects of the present disclosure are directed to techniques for hybrid automatic repeat request (HARQ) codebook design. For example, a user equipment (UE) configured for feedback processing may comprise a memory and a processor configured to receive, from a base station (BS), a first indication of a first feedback process type for providing feedback to the BS for a plurality of feedback processes of the UE. The memory and the processor may also be configured to receive one or more first downlink transmissions from the BS associated with at least one feedback process of the plurality of feedback processes. The memory and the processor may also be configured to transmit feedback or withhold transmission of feedback to the BS regarding decoding of the one or more first downlink transmissions according to the first feedback process type.