MMW Subframe TTI Segmentation for Scheduling Overhead
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Solution Overview
Problem
In millimeter wave (MMW) communication systems, it is challenging for an evolved Node B (eNB) to simultaneously schedule a large number of user equipment (UEs) through frequency-division multiplexing (FDM), and allocating large subframes or slots is inefficient due to significant overhead in turnaround times for small subframes.
Innovation Solution
Implementing a structure with self-contained subframes or slots that include multiple smaller transmission time intervals (TTIs) within them, allowing for efficient scheduling and resource utilization by separating downlink and uplink information transmission within these TTIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If frequency-division multiplexing (FDM) is used to schedule a large number of UEs, then the number of scheduled UEs increases, but the device complexity and resource allocation difficulty increase significantly
Solution Approach 1:
The patent divides the subframe into multiple transmission time intervals (TTIs) of different lengths, creating a segmented time structure. This allows short TTIs for rapid scheduling of multiple UEs and long TTIs for sustained data transmission, thereby reducing scheduling complexity while maintaining the ability to schedule numerous UEs efficiently
2Productivity
If large subframes are allocated to utilize huge bandwidths, then resource utilization improves, but the turnaround overhead becomes significant and inefficient
Solution Approach 1:
The patent introduces dynamic TTI length adjustment within subframes, allowing the system to flexibly switch between short and long TTIs based on traffic conditions. This dynamic structure enables efficient resource utilization by matching TTI length to actual data transmission needs, reducing turnaround overhead when full subframe utilization is not required
3Loss of time
If short self-contained subframes are used to reduce turnaround overhead, then the overhead decreases, but the resource utilization efficiency drops due to inability to allocate large contiguous resources
Solution Approach 1:
The patent segments the subframe into multiple TTIs of varying lengths that can be independently configured. This segmentation allows the system to use short TTIs where needed to reduce overhead while combining multiple TTIs to form effectively large resource allocations when required, thus achieving both low overhead and high resource utilization
Solution Approach 2:
The patent changes the TTI length parameter dynamically within subframes based on scheduling requirements. By adjusting this parameter, the system can optimize between overhead reduction and resource utilization efficiency for different traffic conditions and UE requirements
Data Source
AI summary
A structure where there are self-contained subframes/slots with smaller TTIs within the subframes/slots is provided to address the issues in MMW scheduling. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may transmit downlink information to at least one UE using a plurality of downlink TTIs within a subframe/slot. The apparatus may receive uplink information from the at least one UE using at least one uplink region within the subframe/slot. In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may receive downlink information from a base station using at least one downlink TTI within a subframe/slot. The subframe/slot may include a plurality of downlink TTIs and at least one uplink region. The apparatus may transmit uplink information to the base station using the at least one uplink region within the subframe/slot.