Assistive Periodic Uplink Resources for Low-Latency Reliability
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring reliable and low-latency uplink communication, particularly in network entities that employ energy-saving modes, where retransmission indications can disrupt sleep cycles and hinder energy efficiency.
Innovation Solution
User equipment (UE) transmits data messages via a first set of periodic resources and assistive (redundant) information via a second set of periodic resources, allowing the network entity to verify or correct reception errors without retransmission indications, thereby maintaining network energy savings and improving communication reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network entity uses retransmission indications to ensure reliable uplink communication, then communication reliability is improved, but network energy consumption increases due to disruption of sleep cycles
Solution Approach 1:
The network entity pre-allocates assistive periodic resources in advance for potential retransmissions. When uplink data transmission occurs, the network entity can directly use these pre-configured resources for retransmission without sending retransmission indications that would wake the network entity from sleep mode, thus maintaining energy savings while ensuring communication reliability
Solution Approach 2:
The patent introduces assistive periodic resources as an intermediary mechanism between the UE and network entity. These resources serve as a buffer that allows the network entity to handle retransmissions passively without active signaling, mediating between the need for reliable communication and energy conservation
2Reliability
If the network entity sends retransmission indications to correct reception errors, then communication accuracy is improved, but latency increases due to additional signaling and wake-up overhead
Solution Approach 1:
The network entity configures assistive periodic resources in advance before any data transmission occurs. When retransmission is needed, the UE can immediately use these pre-configured resources without waiting for retransmission indications, thereby reducing the time loss associated with signaling and wake-up procedures while maintaining communication accuracy
3Loss of energy
If the network entity enters energy-saving sleep cycles, then network energy savings are improved, but the ability to respond to transmission errors is reduced
Solution Approach 1:
The patent segments the resource allocation into two distinct parts: regular periodic resources for normal data transmission and assistive periodic resources specifically for retransmissions. This segmentation allows the network entity to maintain sleep cycles while having dedicated resources ready for error handling, thus preserving both energy savings and reliability
Solution Approach 2:
The assistive periodic resources enable the system to self-handle transmission errors without requiring active network entity intervention. The UE autonomously uses these pre-configured resources for retransmissions, allowing the network entity to remain in sleep mode while error handling capability is maintained
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may proactively provide assistive (e.g., redundant) information associated with a set of data messages transmitted via a set of periodic resources, which may reduce an amount of (or obviate the use of) retransmission indications from the network entity. For example, the UE and the network entity may support a first set of periodic resources for transmission of data messages and a second set of periodic resources for transmission of assistive information associated with the data messages. The second set of periodic resources may be a subset of the first set of periodic resources or may be different from the first set of periodic resources, and may be designated or indicated as assistive of the first set of periodic resources via control signaling or an activation downlink control information (DCI).