Multi-Slot TB Resource Determination for Unavailable Slots
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Solution Overview
Problem
In 3GPP NR, the transmission of Transport Blocks over multiple slots (TBoMS) faces challenges such as handling unavailable slots, Redundancy Version (RV) granularity, and repetition across time durations, particularly in NR Release 17, where each TB spans multiple slots, and legacy PUSCH repetition techniques are not directly applicable.
Innovation Solution
The method involves determining physical uplink shared channel (PUSCH) resources for multi-slot TB transmission, handling unavailable slots by dropping specific slots or repetitions, and cycling Redundancy Versions across transmission occasions, ensuring robust transmission and efficient resource utilization by configuring the maximum number of repetitions and starting symbols within the constraints of configured grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-slot TB transmission is implemented to increase total transmission power and reduce CRC overhead, then transmission reliability is improved, but resource allocation complexity increases due to unavailable slots and repetition management
Solution Approach 1:
The multi-slot TB transmission is divided into multiple repetition instances, where each repetition can be independently managed. The TB is segmented across N slots with K repetitions, allowing granular control over unavailable slots and simplifying resource allocation by treating each repetition as a separate manageable unit.
Solution Approach 2:
The system pre-configures the maximum number of repetitions and slot structures before transmission begins. This preliminary configuration establishes the framework for handling unavailable slots in advance, reducing real-time decision complexity during actual transmission.
2Reliability
If the number of repetitions K and slots N are increased to improve transmission robustness, then reliability is improved, but resource utilization efficiency deteriorates due to potential slot unavailability and wasted transmissions
Solution Approach 1:
The system dynamically determines the actual number of successful repetitions based on slot availability. While K and N are configured in advance, the actual transmission adapts to unavailable slots by skipping or dropping affected repetitions, allowing the system to maintain high reliability where possible while avoiding waste in unavailable resources.
Solution Approach 2:
The system changes the effective transmission parameters (actual repetitions transmitted) based on real-time slot availability conditions. This allows optimization of resource utilization by adjusting the number of actual transmissions according to available resources, rather than rigidly following pre-configured values.
3Reliability
If Redundancy Version cycling is applied across transmission occasions to handle unavailable slots, then transmission reliability is improved, but system complexity increases due to RV management across multiple slots
Solution Approach 1:
Redundancy Versions are cycled periodically across transmission occasions in a predetermined sequence (e.g., RV0, RV2, RV3, RV1). This periodic cycling pattern simplifies RV management by establishing a regular, predictable sequence that can be easily tracked and implemented, reducing the complexity of managing diversity across multiple slots.
Data Source
AI summary
Systems and methods are disclosed herein for multiple slot Transport Block (TB) transmission with configured grant. In one embodiment, a method performed by a wireless communication device (WCD) comprises receiving, from a base station, information that configures one or more parameters for an uplink configured grant, determining physical uplink shared channel (PUSCH) resources for transmission of a multiple slot TB using the uplink configured grant, based on the one or more parameters, and transmitting the multiple slot TB on the determined PUSCH resources.