Uplink Signal Transmission in Fallback Mode for Dynamic Wireless Resources
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need for an efficient method to transmit uplink signals when the radio resource usage changes dynamically, especially in fallback mode, where reconfiguration messages may fail, and existing methods do not adequately manage channel state information reporting to support flexible radio resource allocation.
Innovation Solution
A method is introduced where the user equipment receives downlink control information and drops uplink signal transmission in specific subframes only when uplink control information is piggybacked on the uplink data channel, using System Information Block 1 based uplink-downlink configuration, except for Hybrid Automatic Repeat Request (HARQ) reference configuration, to ensure reliable uplink signal transmission in fallback mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink signal transmission is performed in all subframes according to HARQ reference configuration, then transmission reliability is improved, but resource waste occurs in flexible subframes that are dynamically allocated for downlink
Solution Approach 1:
The patent applies dynamics by making the uplink transmission behavior adaptive to the actual subframe configuration. The UE dynamically determines whether to transmit uplink signals based on whether the subframe is a flexible subframe or a legacy uplink subframe, allowing the system to adapt transmission patterns to changing radio resource allocations without sacrificing reliability in critical subframes.
Solution Approach 2:
The patent applies local quality by differentiating transmission requirements between different types of subframes. Instead of applying a uniform transmission rule across all subframes, the patent specifies that uplink transmission should be performed in legacy uplink subframes (maintaining high reliability) while avoiding transmission in flexible subframes (avoiding resource waste), thus optimizing performance locally for each subframe type.
2Adaptability or versatility
If reconfiguration messages are used to dynamically change radio resource usage, then resource allocation flexibility is improved, but transmission failures occur when reconfiguration messages are not properly received
Solution Approach 1:
The patent applies beforehand cushioning by preparing the UE to operate in fallback mode before reconfiguration failures occur. The UE is pre-configured with fallback behavior that activates when reconfiguration messages fail to be received, ensuring continuous operation with default configurations rather than experiencing transmission failures or undefined behavior.
Solution Approach 2:
The patent applies feedback by implementing a mechanism where the UE monitors the reception status of reconfiguration messages and adjusts its transmission behavior accordingly. When reconfiguration messages are not properly received, the UE provides feedback by switching to fallback mode, where it transmits uplink signals only in legacy uplink subframes rather than flexible subframes, thus adapting to the detected reception issues.
3Productivity
If uplink control information is piggybacked on uplink data channel, then transmission efficiency is improved, but interference increases when transmission occurs in dynamically allocated subframes
Solution Approach 1:
The patent applies local quality by restricting piggybacked uplink control information transmission to only legacy uplink subframes, where it is less likely to cause interference with dynamically allocated downlink transmissions. By applying different transmission rules to different subframe types, the patent maintains transmission efficiency in appropriate subframes while avoiding interference in flexible subframes.
Data Source
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AI summary
The present invention relates to a method and a device for transmitting, by a terminal, an uplink signal in a wireless communication system that supports a dynamic change of a wireless resource use. Particularly, the method comprises the step of determining the transmission of an uplink signal in a specific subframe on a first uplink-downlink setting in accordance with a fallback mode, wherein the fallback mode is applied if the reception of a change in use message transmitted so as to reset to a wireless resource use in accordance with a second uplink-downlink setting is not successful.