LTE ACK/NACK Scheduling with Configurable Delay and Resource Allocation
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Solution Overview
Problem
Existing LTE cellular systems face challenges in managing acknowledgments (ACKs) and negative acknowledgments (NACKs) due to high interference and redundant transmissions, particularly in femto cells and power save modes, leading to unreliable and inefficient communication.
Innovation Solution
The eNB and UE are informed of changes in configurations for ACK/NACK transmissions, including resource allocation and delay periods, to optimize ACK/NACK scheduling, reducing interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACKs/NACKs are transmitted frequently to ensure reliable communication, then reliability is improved, but interference increases and power consumption rises
Solution Approach 1:
The patent implements dynamic ACK/NACK scheduling where the eNB configures different delay periods (e.g., 4ms, 6ms, 8ms) based on channel conditions and traffic patterns. This dynamic adjustment allows the system to reduce transmission frequency during good conditions (lowering interference) while maintaining reliability during poor conditions through longer delay periods that allow for better resource selection.
Solution Approach 2:
The system changes the time-domain parameter by introducing configurable delay periods between data transmission and ACK/NACK transmission. This parameter change allows flexible control over transmission timing, enabling the system to avoid high-interference periods and optimize power consumption while maintaining communication reliability through adaptive timing adjustments.
2Reliability
If ACKs/NACKs are transmitted frequently to ensure reliable communication, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic scheduling where UEs can be configured with different ACK/NACK delay periods (4ms, 6ms, 8ms) based on their power save mode status and channel conditions. This dynamic approach allows power-constrained UEs to use longer delay periods that reduce transmission frequency and power consumption, while maintaining reliability through adaptive resource selection during the delayed transmission window.
Solution Approach 2:
The system employs periodic ACK/NACK transmissions with configurable periods (delay periods) instead of continuous transmissions. By allowing UEs to transmit ACKs/NACKs after configured delay periods (e.g., 6ms) rather than immediately, the system reduces the frequency of transmissions and associated power consumption while maintaining reliable communication through the periodic nature of the acknowledgments.
3Device complexity
If fixed timing is used for ACK/NACK transmission, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent implements a dynamic configuration system where the eNB can assign different delay periods (4ms, 6ms, 8ms) to different UEs or different transmission scenarios through RRC signaling. This dynamic approach maintains relatively simple device complexity by using pre-configured delay values while achieving high adaptability by selecting appropriate delay periods based on channel conditions, power save mode status, and traffic patterns.
Solution Approach 2:
The system changes the time-domain parameter by introducing configurable delay periods that can be adjusted through RRC signaling. This parameter change enables adaptability without significantly increasing device complexity, as the UEs simply follow the configured delay values provided by the eNB. The eNB can adaptively select from a set of predefined delay periods (4ms, 6ms, 8ms) based on current system conditions.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be an eNB. The eNB informs UE(s) of a change in at least one of a first configuration for transmission of ACKs/NACKs by the UE(s) for DL transmissions received by the UE(s) or a second configuration for reception of ACKs/NACKs by the UE(s) for UL transmissions sent by the UE(s). The eNB indicates to the UE(s) one or more resources in which the UE(s) is to transmit the ACKs/NACKs for the received DL transmissions or is to receive the ACKs/NACKs for sent UL transmissions. The eNB indicates to the UE(s) a subset of the DL transmissions to the UE(s) for which the UE(s) is to transmit the ACKs/NACKs or a subset of the UL transmissions by the UE(s) for which the UE(s) is to receive the ACKs/NACKs.