Configured Grant Selection for CBG Uplink in Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing NR-U systems face inefficiencies in configuring resource allocation for configured grant transmissions in unlicensed spectrum, particularly with large TB sizes that are not fully utilized and small TB sizes unsuitable for CBG-based transmissions, leading to suboptimal use of channel resources.
Innovation Solution
Implementing dynamic activation and deactivation of CBG-based transmissions based on factors such as BWP size, buffer status, interference levels, and channel measurements, along with multiple configured grant configurations to optimize resource usage and LBT processes across sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single configured grant configuration is used, then device complexity is reduced, but resource utilization efficiency deteriorates due to inability to adapt to varying channel conditions and traffic patterns
Solution Approach 1:
The patent implements dynamic switching between multiple configured grant configurations based on channel conditions, traffic patterns, and LBT outcomes. The system transitions from static single-configuration to dynamic multi-configuration, allowing optimal resource utilization by selecting appropriate configurations in real-time according to varying operational conditions.
Solution Approach 2:
The patent creates multiple configured grant configurations that can serve different functions and scenarios. Each configuration is optimized for specific channel conditions or traffic types, and the system can universally handle various transmission scenarios by selecting the most appropriate configuration from the set, thereby improving overall adaptability and resource efficiency.
2Productivity
If TB size is increased to handle large data transmissions, then throughput is improved, but reliability deteriorates because small TB sizes are unsuitable for CBG-based transmissions
Solution Approach 1:
The patent divides the transport block into multiple code block groups (CBGs) that can be independently transmitted and acknowledged. This segmentation allows selective retransmission of only failed CBGs rather than the entire TB, improving reliability for both small and large TB sizes while maintaining throughput efficiency through parallel CBG processing.
Solution Approach 2:
The patent dynamically adjusts TB size and CBG configuration parameters based on channel conditions, traffic requirements, and LBT outcomes. By changing these parameters adaptively, the system achieves optimal balance between throughput and reliability, allowing small TBs to use CBG-based transmissions when appropriate and large TBs to utilize full throughput capability when channel conditions permit.
3Reliability
If LBT procedures are performed before each transmission, then channel access reliability is improved, but latency increases due to repeated channel access attempts
Solution Approach 1:
The patent performs LBT procedures and selects optimal configured grant configurations in advance before actual data transmission. By preparing transmission parameters and selecting configurations proactively, the system reduces the time required during actual transmission attempts, thereby lowering latency while maintaining reliable channel access through preliminary LBT execution.
Solution Approach 2:
The patent implements dynamic configuration selection based on LBT outcomes and channel conditions. When LBT succeeds, the system can quickly switch to pre-configured grant configurations without requiring additional scheduling delays, thereby reducing latency. The dynamic adaptation allows the system to balance between performing thorough LBT for reliability and minimizing waiting time for transmission.
4Adaptability or versatility
If multiple configured grant configurations are implemented, then adaptability to channel conditions is improved, but device complexity increases due to additional configuration management
Solution Approach 1:
The patent enables the system to automatically select and switch between multiple configured grant configurations based on pre-defined criteria such as channel conditions, traffic patterns, and LBT outcomes. The self-service mechanism eliminates the need for complex manual configuration management or continuous network control signaling, allowing the system to adaptively manage multiple configurations autonomously while maintaining relatively simple operation.
Data Source
AI summary
Methods, apparatus, systems, architectures and interfaces for performing a configured grant (CG) uplink (UL) transmission are provided. The method includes receiving configuration information associated with a plurality of CG configurations for CG UL transmission; determining to transmit the CG UL transmission according to any of: (1) a set of available channel bandwidths, (2) a number of code block groups (CBGs), and (3) transmission parameters associated with the CG UL transmission; selecting a first CG configuration according to any of: (1) the set of available channel bandwidths, (2) the number of code block groups (CBGs), and (3) the transmission parameters associated with the CG UL transmission; and transmitting any number of CBGs as the CG UL transmission using resources associated with the selected first configuration, wherein the resources of the selected first CG configuration are entirely within the set of available channel bandwidths.