Downlink Transmission Recognition Using LBT Signaling
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Solution Overview
Problem
New generation communication systems face challenges in supporting diverse service requirements due to limitations of licensed spectra, particularly in managing downlink transmissions for services like eMBB, URLLC, and mMTC, which demand varying bandwidth, reliability, and latency.
Innovation Solution
Implementing a mechanism that uses Listen Before Talk (LBT) for unlicensed frequency spectra, along with configuring indication information and explicit/implicit signaling to accurately identify downlink transmissions, including COT configuration, to enhance channel access and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) mechanism is implemented for unlicensed frequency spectra, then channel access reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the channel access process into distinct phases: LBT listening phase, COT configuration phase, and downlink transmission phase. The COT is divided into multiple downlink transmissions with individual indication information, allowing the system to manage complexity by breaking down the overall process into manageable, standardized components that can be independently controlled and measured.
Solution Approach 2:
The patent implements preliminary action by configuring COT parameters and indication information before actual downlink transmissions occur. The base station pre-configures the terminal with COT duration, indication information formats, and measurement timing, enabling the terminal to prepare measurement resources in advance rather than reacting dynamically during transmission, thus reducing operational complexity.
2Measurement precision
If indication information is configured for each downlink transmission, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by providing indication information selectively - not every downlink transmission requires full measurement, but rather only those that need precise channel state feedback. The indication information is configured based on actual measurement needs, allowing the system to obtain sufficient measurement precision for critical transmissions while avoiding the overhead of providing indication information for all transmissions.
Solution Approach 2:
The indication information serves multiple functions simultaneously: it identifies downlink transmission boundaries, triggers channel state measurements, and provides timing references. This multi-functionality reduces the need for separate signaling mechanisms, thereby decreasing overall signaling overhead while maintaining measurement precision.
3Adaptability or versatility
If flexible subframe configuration is implemented for diverse services, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamics by allowing flexible configuration of COT parameters and indication information based on service requirements. The system can dynamically adjust COT duration, indication information frequency, and measurement timing according to whether the service is eMBB, URLLC, or mMTC, enabling adaptability without requiring completely different system architectures for each service type.
Solution Approach 2:
The patent uses parameter changes to achieve flexibility - by modifying COT configuration parameters (duration, periodicity, indication information inclusion) rather than changing the fundamental system structure. This allows the same basic framework to support diverse services through parameter adjustment, reducing system complexity compared to designing separate systems for each service type.
Data Source
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AI summary
The present disclosure provides a method and apparatus for recognizing downlink transmission. The method is applied to a base station, and the method comprises: configuring indication information for recognizing downlink transmission; and sending the indication information to a terminal, so that the terminal recognizes the downlink transmission according to the indication information. Therefore, according to the present disclosure, downlink transmission can be recognized according to indication information of a base station, thereby improving the accuracy of recognizing downlink transmission, and further improving the efficiency of recognizing downlink transmission.