Low-Latency Signaling for HARQ-ACK Bit Group Aggregation
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Solution Overview
Problem
In existing LTE systems, reducing latency in wireless communication requires redesigning the timing relationship between downlink transmission and uplink feedback, but this increases uplink power consumption and efficiency issues for power-limited User Equipment (UEs) when transmitting multiple downlink transmissions.
Innovation Solution
A method in a UE supporting Hybrid Automatic Repeat Request (HARQ) that includes receiving a radio signal, detecting low-latency signaling, and transmitting HARQ-ACK information, where the low-latency signaling determines whether HARQ-ACK bits are included in a specific bit group and occupies time-domain resources, allowing for optimized uplink resource allocation and power usage by using Short Latency Physical Uplink Control/Shared Channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the timing relationship between downlink transmission and uplink feedback is redesigned to reduce latency, then transmission latency is reduced, but uplink power consumption increases
Solution Approach 1:
The patent combines multiple HARQ-ACK bit groups corresponding to different downlink transmissions into a single uplink transmission opportunity. By merging the feedback for multiple short TTI transmissions that would otherwise require separate uplink resources, the system reduces the number of uplink transmissions and associated power consumption while maintaining low latency feedback for each transmission.
Solution Approach 2:
The patent introduces dynamic timing relationships where the uplink feedback timing is flexibly configured based on the specific downlink transmission timing. Instead of fixed timing relationships, the system dynamically adjusts when HARQ-ACK feedback is transmitted, allowing optimization between latency and power consumption based on actual traffic conditions and UE power status.
2Speed
If multiple downlink transmissions are supported simultaneously with reduced TTI duration, then transmission speed increases, but the number of uplink control information transmissions increases
Solution Approach 1:
The patent merges multiple HARQ-ACK bit groups from different short TTI transmissions into a single consolidated uplink transmission. Instead of sending separate UCI for each short TTI downlink transmission, the system combines all HARQ-ACK feedback into one transmission, significantly reducing the total number of UCI transmissions while maintaining the ability to provide feedback for multiple high-speed transmissions.
Solution Approach 2:
The patent creates a universal uplink feedback mechanism that can handle HARQ-ACK feedback for multiple different downlink transmissions simultaneously. The single uplink transmission structure is designed to carry aggregated feedback for various short TTI transmissions, making the feedback system multi-functional and adaptable to different transmission scenarios without requiring separate dedicated feedback channels for each transmission.
3Reliability
If multiple HARQ-ACK bit groups are transmitted separately for different downlink transmissions, then feedback accuracy is maintained, but transmission efficiency decreases
Solution Approach 1:
The patent merges multiple HARQ-ACK bit groups into a single aggregated feedback transmission while preserving the individual feedback information for each downlink transmission. The aggregation process maintains the distinctness of each HARQ-ACK bit group's information content, ensuring that feedback accuracy for individual transmissions is preserved while achieving higher transmission efficiency through consolidated uplink resources.
Data Source
AI summary
The present disclosure provides a method and a device in wireless transmission. A User Equipment (UE) receives a first radio signal, then detects a low-latency signaling in L1 time intervals respectively, and transmits first HARQ-ACK information. The low-latency signaling includes a first field, and the first field is used for determining a relationship between a low-latency HARQ-ACK bit group and a first HARQ-ACK bit group. The first HARQ-ACK information includes part or all of HARQ-ACK bits in the first HARQ-ACK bit group. Through the design of the first field, the information in the first HARQ-ACK bit group can be put into the low-latency HARQ-ACK bit group to transmit, thereby optimizing the transmission of the Uplink Control Information (UCI) for HARQ-ACK, reducing the resource overhead and power overhead for the transmission of the UCI, and improving the overall system performance and spectrum efficiency.