LTE-Advanced Asymmetric Bandwidth Feedback Mechanism
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Solution Overview
Problem
The LTE-Advanced system faces challenges in effectively feeding back uplink control signaling due to asymmetric uplink and downlink system bandwidths, requiring a novel method that ensures compatibility with conventional LTE systems and allows for a smooth transition.
Innovation Solution
A base station and user device system that divides the downlink system bandwidth into multiple basic bandwidths, allocates sequences for uplink control signaling, and optimizes resource scheduling to efficiently feed back control information using existing LTE mechanisms, even when uplink and downlink bandwidths are not equal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the uplink system bandwidth and downlink system bandwidth are made asymmetric in LTE-Advanced, then the system can support wider frequency bands and higher peak velocities, but the conventional LTE feedback mechanism for uplink control signaling can no longer be used effectively
Solution Approach 1:
The patent segments the downlink system bandwidth into multiple downlink basic bandwidths (component carriers), each with its own associated uplink control signaling feedback mechanism. This segmentation allows the system to handle asymmetric bandwidth configurations by processing feedback for each component carrier independently, thereby maintaining compatibility with conventional LTE mechanisms while enabling LTE-Advanced functionality.
Solution Approach 2:
The patent creates a universal feedback mechanism that can operate in both conventional LTE mode (equal uplink-downlink bandwidth) and LTE-Advanced mode (asymmetric bandwidth). The base station and user device can dynamically adapt the feedback process based on the operational mode, making the same fundamental mechanism applicable to both systems without requiring separate dedicated mechanisms.
2Reliability
If a novel feedback method is developed for asymmetric bandwidth in LTE-Advanced, then effective uplink control signaling feedback is achieved, but compatibility with conventional LTE systems is compromised
Solution Approach 1:
The patent implements a dynamic feedback mechanism where the base station and user device can adapt their operation based on the configured bandwidth mode. When operating in conventional LTE mode with equal bandwidths, the system uses the standard feedback mechanism. When transitioning to LTE-Advanced mode with asymmetric bandwidths, the system automatically switches to the enhanced feedback mechanism that processes multiple downlink basic bandwidths, thus maintaining reliability across different operational contexts.
3Device complexity
If the conventional LTE feedback mechanism is used in LTE-Advanced with asymmetric bandwidths, then system simplicity is maintained, but the feedback cannot effectively handle multiple downlink basic bandwidths
Solution Approach 1:
The patent segments the feedback processing into multiple independent units, with each downlink basic bandwidth having its own feedback handling mechanism. This segmentation allows the system to maintain the simplicity of individual feedback processing units while achieving enhanced overall processing capability through parallel handling of multiple bandwidths, thus avoiding the need for a completely complex new system.
Data Source
AI summary
In a mobile communication system of the present invention, a base station apparatus and mobile station apparatus (user device) communicate each other on a plurality of downlink component carriers and a plurality of uplink component carriers. And while the mobile station apparatus (user device) transmit an uplink data to the base station apparatus on the plurality of uplink component carriers, the mobile station apparatus (user device) transmit a scheduling request for requesting uplink resource for the uplink data to the base station apparatus using a physical uplink control channel (PUCCH) only on a specific uplink component carrier of the plurality of uplink component carriers.