sTTI Resource Grant Indexing for Wireless Device Latency Reduction
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Solution Overview
Problem
Current communications networks face challenges in achieving efficient resource allocation and reduced packet latency, particularly in supporting short subframes which are essential for improved performance and capacity, especially with the existing 1 ms fixed subframe structure and control signaling mechanisms.
Innovation Solution
The method involves transmitting resource grants to wireless devices in a shortened transmission time interval (sTTI) frequency band, where the grant includes an index that identifies the position of resources within the sTTI frequency band, allowing for flexible control information size and efficient sharing of resources among multiple devices, thereby reducing overhead and enabling latency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing 1 ms fixed subframe structure is used, then the control signaling mechanism is simple, but the packet latency cannot be reduced and network capacity is limited
Solution Approach 1:
The patent segments the control information transmission by introducing a new DCI format (DCI format 6) specifically for sTTI scheduling, separate from the legacy DCI formats used for 1 ms subframes. This segmentation allows independent optimization of control signaling for short TTI operations without disrupting existing control mechanisms, enabling reduced packet latency while maintaining backward compatibility
Solution Approach 2:
The patent introduces a new dimension in control signaling by defining DCI format 6 with a specific structure that includes an sTTI field and resource allocation fields optimized for short TTI. This dimensional change in the control information structure enables efficient scheduling of sTTI transmissions while keeping the overall control signaling framework manageable
2Productivity
If resource grants are transmitted for multiple wireless devices in sTTI frequency band, then resource utilization improves, but control overhead increases
Solution Approach 1:
DCI format 6 is designed as a universal control message that can schedule multiple wireless devices within the sTTI frequency band using a single grant structure. The format includes fields that can accommodate resource allocations for multiple devices, enabling one control message to serve multiple purposes and reduce overall control overhead while improving resource utilization
Solution Approach 2:
The patent changes the parameters of control information by introducing DCI format 6 with specific field configurations including an sTTI field and resource allocation fields optimized for sTTI. These parameter changes enable efficient representation of multiple device schedules within compact control messages, reducing control overhead while maintaining high resource utilization
3Loss of time
If short subframes are implemented, then packet latency is reduced, but the existing control signaling cannot indicate scheduling in short subframes
Solution Approach 1:
The patent makes the control signaling adaptive by introducing DCI format 6 that dynamically handles sTTI scheduling requirements. The format includes flexible fields that can adapt to different sTTI configurations and resource allocation scenarios, enabling the control signaling to accommodate varying short subframe structures while achieving reduced packet latency
Data Source
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AI summary
There is provided mechanisms for granting resources to a wireless device. A method is performed by a network node. The method comprises obtaining an indication for granting the resources to the wireless device. The method comprises transmitting, to the wireless device, a grant for the resources in a transmission time interval (sTTI) frequency band. The grant comprises an index, and the index identifies a position of the resources within the sTTI frequency band.