ACK/NACK Resource Sizing Based on Device Distance
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the reliability of ACK/NACK transmission is compromised at longer distances due to decreased signal strength, leading to potential data failure and inefficiencies in resource allocation, especially for power-limited devices.
Innovation Solution
The method involves determining the size of the ACK/NACK resource based on the distance between the transmitting and receiving devices, using reference signal received power (RSRP) or location information, and adjusting the resource size accordingly, with options for indicating this through RRC signaling or direct communication from the transmitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed ACK/NACK resource size is allocated to all devices regardless of distance, then resource allocation is simple and device complexity is low, but transmission reliability deteriorates at longer distances due to decreased signal strength
Solution Approach 1:
The patent applies local quality by allocating different ACK/NACK resource sizes based on the distance between transmitting and receiving devices. Devices at longer distances receive larger resource allocations to compensate for signal attenuation, while devices at shorter distances use smaller resources. This creates a non-uniform resource allocation strategy that adapts to local channel conditions, thereby improving transmission reliability without uniformly increasing system complexity.
Solution Approach 2:
The patent implements dynamics by making the ACK/NACK resource size variable rather than fixed. The resource allocation dynamically adjusts according to the measured distance or signal strength between devices. This dynamic adaptation allows the system to optimize transmission reliability for each specific communication scenario while maintaining efficient resource utilization across the network.
2Reliability
If larger ACK/NACK resources are allocated to compensate for distance-related signal loss, then transmission reliability improves, but resource allocation efficiency deteriorates due to increased resource consumption
Solution Approach 1:
The patent applies parameter changes by modifying the ACK/NACK resource size parameter based on the distance or signal strength conditions. Instead of using a fixed resource allocation, the system adjusts the resource parameter dynamically to match the channel conditions. This ensures that sufficient resources are allocated only when necessary (at longer distances), maintaining reliability while avoiding wasteful resource consumption in scenarios with better channel conditions.
3Reliability
If distance-based resource allocation is implemented, then transmission reliability improves for power-limited devices, but system complexity increases due to distance measurement and resource determination
Solution Approach 1:
The patent applies self-service by enabling devices to autonomously determine their distance or signal strength conditions and select appropriate ACK/NACK resource sizes without requiring complex centralized control. The receiving device can measure the received signal strength or the transmitting device can calculate distance based on available information, and the appropriate resource size is determined locally. This reduces the need for complex system-wide coordination while still achieving distance-adaptive resource allocation that benefits power-limited devices.
Data Source
AI summary
The present invention relates to a method and apparatus for feeding back acknowledgement/negative-ACK (ACK/NACK) by a receiving device in a wireless communication system. Specifically, the method comprises the steps of: receiving data from a transmitting device; and feeding back ACK/NACK for data to the transmitting device, wherein the size of resource for ACK/NACK is determined on the basis of a distance between the transmitting device and the receiving device. The receiving device is capable of communicating with at least one of another transmitting device, a transmitting device related to an autonomous driving vehicle, a base station or a network.