Uplink Channel Access with Flexible Start Points on Unlicensed Carriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing unlicensed carriers for uplink data transmission due to regulatory requirements and limitations in channel access procedures, leading to low channel access probability and inefficient resource utilization.
Innovation Solution
The technology supports multiple flexible starting points and channel access methods for uplink transmission, including CCA procedures and flexible data starting points, allowing for continuous transmission across multiple TTIs with improved channel access mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single channel access procedure is performed at a fixed starting location, then the channel access procedure is simple to implement, but the probability of successful channel access is low and resource utilization is inefficient
Solution Approach 1:
The patent segments the uplink transmission resources into multiple transmission occasions, each with a candidate starting location. Instead of a single channel access procedure at one fixed location, the system performs channel access procedures at multiple segmented opportunities, increasing the probability of successful access while maintaining manageable complexity through structured resource division.
Solution Approach 2:
The patent introduces dynamic selection of starting locations among multiple candidates based on channel access outcomes. The system adapts to channel conditions by flexibly choosing from predefined candidate starting locations, transforming the static single-point access into a dynamic multi-point access mechanism that improves reliability without linearly increasing complexity.
2Productivity
If multiple transmission resources are allocated for uplink data, then resource utilization improves, but the complexity of managing multiple starting locations and channel access procedures increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate starting locations and associated transmission resources before actual data transmission. This allows the system to efficiently utilize multiple transmission resources without real-time decision complexity, as the framework for resource management is established in advance through RRC signaling or system information.
Solution Approach 2:
The patent changes the parameter of starting location from a single fixed value to multiple candidate values. By modifying this key parameter and associating it with multiple transmission resources, the system achieves improved resource utilization while managing complexity through parameter-based resource identification and selection mechanisms.
3Reliability
If channel access is required before each transmission, then regulatory requirements are met, but the transmission delay increases and efficiency decreases
Solution Approach 1:
The patent enables continuity of useful action by allowing data transmission to continue across multiple transmission occasions without requiring a new channel access procedure for each occasion. Once channel access is successfully obtained at a candidate starting location, the transmission can proceed continuously through associated transmission resources, reducing redundant access delays while maintaining regulatory compliance.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Methods, systems, and devices related to digital wireless communication are described. An illustrative method of wireless communication includes receiving information regarding uplink transmission. The information includes multiple transmission resources scheduled by control information and multiple candidate starting locations in the multiple transmission resources. The method further includes performing a channel access procedure at one of the multiple candidate starting locations, and in response to a result of the channel access procedure, transmitting data via the transmission resources.