Uplink HARQ Feedback Segmentation for Downlink SPS Control
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in handling uplink control information (UCI) due to challenges in managing hybrid automatic repeat request (HARQ) feedback, particularly in scenarios involving downlink semi-persistent scheduling (SPS) configurations, leading to suboptimal resource utilization and increased latency.
Innovation Solution
A method for wireless transmit/receive units (WTRUs) that involves receiving downlink SPS configurations, determining HARQ feedback bits, segmenting them based on triggering conditions, and transmitting specific portions of the feedback using uplink channels, optimizing the HARQ feedback process to improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all HARQ feedback bits are transmitted in a single uplink channel, then complete feedback information is provided, but uplink resource overhead increases and latency increases
Solution Approach 1:
The patent divides the complete HARQ feedback bit sequence into multiple segments based on triggering conditions. Each segment is transmitted separately in different uplink channels or at different times, reducing the time required for each transmission while ensuring complete feedback delivery through cumulative transmission of all segments.
Solution Approach 2:
The patent implements periodic transmission of HARQ feedback segments based on configured periodicity. Different segments are transmitted at different periodic intervals, allowing the system to balance between transmission completeness and latency reduction by adjusting the periodicity parameters.
2Loss of time
If HARQ feedback is segmented and transmitted in multiple uplink channels, then transmission latency is reduced, but device complexity increases
Solution Approach 1:
The patent pre-configures segmentation parameters, triggering conditions, and transmission periodicity before actual HARQ feedback transmission. This preliminary configuration reduces runtime decision complexity by establishing rules in advance, allowing the device to simply follow predetermined segmentation and transmission patterns based on configured parameters.
3Ease of operation
If HARQ feedback bits are transmitted without segmentation, then transmission management is simpler, but uplink resource utilization efficiency decreases
Solution Approach 1:
The patent segments HARQ feedback bits into multiple groups that can be transmitted in parallel or at different times across available uplink resources. This improves resource utilization by distributing feedback transmission across multiple channels or time slots, preventing resource idle time and enabling better load balancing on uplink resources.
Solution Approach 2:
The patent uses periodic transmission patterns for different feedback segments, allowing the system to efficiently utilize recurring uplink resource opportunities. By aligning segment transmissions with periodic resource availability, the system maximizes resource utilization while maintaining manageable transmission complexity through regular patterns.
Data Source
AI summary
Methods and apparatus for uplink control enhancement in wireless communications are disclosed. In an example, a method includes receiving information related to a set of downlink SPS configurations, receiving downlink SPS transmission(s) based on the received information, determining a payload of UCI for transmission over an uplink channel, the payload comprises a set of HARQ feedback bits based on the received information, determining that at least one triggering condition for segmenting the set of HARQ feedback bits is satisfied, determining at least a portion of the set of HARQ feedback bits based on at least a downlink SPS configuration of the set of downlink SPS configurations, wherein the determined portion of the set of HARQ feedback bits corresponds to a respective subset of the received downlink SPS transmission(s), and transmitting at least the determined portion of the set of HARQ feedback bits using the uplink channel.