Uplink Scheduling Grants for Mixed-Latency Data Transmission
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Solution Overview
Problem
Existing wireless communication networks face inefficiencies in uplink scheduling, particularly in handling different types of data with varying time-scale requirements, leading to wasted bandwidth and suboptimal resource utilization while maintaining quality of service (QoS) prioritization.
Innovation Solution
A method involving a wireless device and network node that allows for flexible scheduling by sending additional scheduling grants to combine or override previous grants, enabling simultaneous transmission of data with different time-scale requirements using the same or different HARQ processes, thereby optimizing resource use and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate scheduling is used for different data categories with different time-scale requirements, then each data category can be scheduled with its corresponding optimal offset value, but device complexity and scheduling overhead increase
Solution Approach 1:
The patent combines multiple scheduling grants for different data categories into a single unified scheduling mechanism. The network node sends one scheduling grant that contains multiple grant indicators, each pointing to different data categories (e.g., URLLC, eMBB, mMTC), allowing simultaneous scheduling of multiple data types without requiring separate scheduling procedures for each category.
Solution Approach 2:
The scheduling grant is designed to serve multiple functions simultaneously - it can schedule different data categories (URLLC, eMBB, mMTC) with different time-scale requirements using a single grant structure. The grant includes flexible fields that can be configured to accommodate various data types and their specific transmission requirements.
2Loss of time
If early scheduling decision is made for small-timescale data, then latency is reduced, but bandwidth is wasted when actual data buffer size deviates from scheduled amount
Solution Approach 1:
The scheduling mechanism is made dynamic by allowing the network node to send additional scheduling grants that can override or supplement previous grants. The second scheduling grant received at a second time slot can modify the transmission parameters for the third time slot based on updated buffer status, enabling adaptive resource allocation that responds to actual data availability.
Solution Approach 2:
The system implements feedback through the scheduling grant mechanism where the network node receives buffer status information from the wireless device and adjusts subsequent scheduling grants accordingly. This feedback loop allows the network to optimize resource allocation based on actual data buffer states, preventing both premature transmission and resource waste.
3Reliability
If large time-scale offset is used for A-CSI transmission, then measurement samples can be collected and processed, but small-time-scale data is forced to use larger offset than needed
Solution Approach 1:
The scheduling grant is segmented into multiple independent grant indicators, each capable of scheduling different data categories with their own optimal time offsets. The first grant indicator can schedule A-CSI with a large offset for measurement collection, while the second grant indicator can schedule small-time-scale data with a smaller offset, allowing both to coexist without mutual interference.
Data Source
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AI summary
Disclosed is a method performed by a wireless device (140) for wireless transmission of data to a network node (130) of a wireless communication network (100). The method comprises receiving, from the network node (130), at a first time slot, a first scheduling grant instructing the wireless device (140) to transmit first data to the network node (130) at a third time slot, and receiving, from the network node (130), at a second time slot later than the first time slot but earlier than the third time slot, a second scheduling grant instructing the wireless device (140) to transmit second data to the network node at the third time slot. The method further comprises transmitting, to the network node (130) at the third time slot, the second data, and possibly also the first data, in uplink transmission resources of the third time slot, wherein the transmission is performed in accordance with an instruction.