Uplink Resource Selection Using Downlink Quality Feedback
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Solution Overview
Problem
In conventional LTE, the need for uplink radio resource allocation for every uplink signal transmission leads to significant control signal overhead and delay, especially in environments with a large number of terminals, as many control signals are transmitted and received before actual uplink signal transmission can occur.
Innovation Solution
A user apparatus measures downlink signal reception quality and determines a suitable radio resource for uplink signal transmission using pre-transmitted resource allocation information, allowing it to transmit uplink signals without receiving explicit uplink radio resource allocation from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LTE resource allocation is used where the user apparatus receives uplink radio resource allocation from the base station for every uplink signal transmission, then the uplink signal can be transmitted with proper resource management, but control signal overhead becomes great and delay occurs before uplink signal transmission
Solution Approach 1:
The base station performs preliminary resource allocation by notifying the user apparatus of multiple candidate radio resources and their associated downlink signal reception quality levels in advance. The user apparatus stores this information and autonomously selects appropriate resources based on its measured downlink quality without requiring real-time base station allocation, thereby eliminating the delay caused by sequential control signal exchanges while maintaining reliable uplink transmission.
2Reliability
If conventional LTE resource allocation is used with multiple control signals exchanged between user apparatus and base station, then uplink signal transmission can be managed, but control signal overhead becomes great in environments with enormous number of terminals
Solution Approach 1:
The invention extracts the resource selection function from the base station's control signal processing and transfers it to the user apparatus. The base station only needs to notify candidate resources and their quality associations in advance, while the user apparatus autonomously selects resources based on its own downlink quality measurements. This extraction eliminates the need for continuous real-time allocation control signals, dramatically reducing control signal overhead in environments with many terminals.
3Productivity
If the user apparatus autonomously determines radio resources based on measured downlink signal reception quality and pre-notified resource allocation information, then control signal overhead and delay are reduced, but the system requires accurate downlink quality measurement and matching capability
Solution Approach 1:
The invention establishes a feedback mechanism where the user apparatus measures downlink signal reception quality and compares it with the quality levels associated with candidate resources previously notified by the base station. This feedback loop enables the user apparatus to autonomously select the most appropriate radio resource based on current channel conditions, achieving high transmission efficiency while maintaining accurate resource selection through continuous quality monitoring and comparison.
Data Source
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AI summary
A user apparatus according to an embodiment is provided. The user apparatus communicates with a base station in a wireless communication system. The user apparatus includes an obtaining unit configured to obtain resource allocation information in which downlink signal reception quality is associated with radio resources used for uplink signal transmission; a measurement unit configured to measure the downlink signal reception quality; and a transmission unit configured to determine a radio resource of the radio resources used for uplink signal transmission by comparing the resource allocation information with the measured downlink signal reception quality, and transmit an uplink signal by using the determined radio resource.