Configured Grant Time Resources for New Radio Uplink
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Solution Overview
Problem
Current New Radio (NR) configurations for uplink communications face challenges in efficiently managing time resources, particularly in unlicensed spectra, where flexible and dynamic allocation of time slots is necessary to optimize data transmission without gaps and minimize overhead, especially for low-latency and high-reliability services like URLLC.
Innovation Solution
The proposed solution involves configuring wireless devices with 'configured grant' time resources based on periodicity and a bitmap indicating allowed time slots for uplink transmissions, allowing for flexible and dynamic allocation of time resources, enabling efficient use of unlicensed spectra by allowing transmissions on specific slots while excluding others, and supporting multiple configurations for adaptive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional slot-based transmission is used, then structure and synchronization are maintained, but latency increases and flexibility is reduced for low-latency services
Solution Approach 1:
The transmission time interval is segmented into multiple mini-slots, each capable of independent transmission. This allows the system to select shorter mini-slot durations for low-latency services while maintaining the overall slot structure for synchronization, thereby reducing transmission latency without compromising service reliability
Solution Approach 2:
The system dynamically adjusts the transmission time interval between traditional slots and mini-slots based on service requirements. For low-latency services like URLLC, shorter mini-slot intervals are used; for services requiring structure and synchronization, traditional slot intervals are maintained, achieving both low latency and high reliability
2Productivity
If continuous time resource allocation is used, then resource utilization is maximized, but overhead increases and flexibility decreases for dynamic services
Solution Approach 1:
Time resources are segmented into configurable units (slots and mini-slots) that can be independently allocated. This segmentation allows the system to allocate resources continuously where needed while leaving gaps for other services, maximizing resource utilization without requiring complex continuous allocation mechanisms
Solution Approach 2:
The same time resource configuration mechanism serves multiple functions: it enables continuous allocation for high throughput services, allows flexible gap allocation for low-latency services, and maintains compatibility with traditional slot-based operations, thereby achieving high productivity without increasing device complexity
3Adaptability or versatility
If flexible time slot allocation is implemented, then adaptability for different services is improved, but system complexity and configuration difficulty increase
Solution Approach 1:
The system uses dynamic configuration parameters that can be adjusted based on service requirements. The same basic framework supports both traditional slot-based operations and mini-slot-based operations by simply changing configuration values, enabling high service adaptability without increasing fundamental system complexity
Solution Approach 2:
Flexibility is achieved by changing parameters such as mini-slot duration, mini-slot quantity per slot, and time domain allocation patterns rather than fundamentally altering the system architecture. This allows the system to adapt to different services while maintaining a relatively simple and unified configuration approach
Data Source
AI summary
A method and apparatus are disclosed for time resources for NRU configured UL. In one embodiment, a network node is configured to configure a wireless device (WD) with at least one configured grant, CG, uplink transmission configuration; and receive signaling based at least in part on the at least one CG uplink transmission configuration. In one embodiment, a wireless device (WD) is configured to obtain at least one configured grant, CG, uplink transmission configuration; and transmit signaling based at least in part on the obtained at least one CG uplink transmission configuration.