Short TTI Signaling via Fast Grant Mechanism
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically configuring short Transmission Time Intervals (TTIs) for uplink transmissions, leading to increased latency and reduced data rates due to higher overhead and complexity in control signaling.
Innovation Solution
A method is introduced that allows for flexible configuration of short TTIs by using a fast grant mechanism, which indicates the positions and lengths of DMRS and data symbols, as well as the length of the short TTI, thereby enabling dynamic switching between TTI durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If short TTI transmissions are configured using existing control channels (PDCCH/ePDCCH), then latency is reduced, but signaling overhead and implementation complexity increase
Solution Approach 1:
The patent segments the control signaling into two parts: a common grant indicating short TTI configuration parameters ( transmitted on PDCCH/ePDCCH), and dedicated grants for specific transmissions (transmitted on sPDCCH). This segmentation reduces the information burden on each control channel, lowering overall signaling overhead while enabling short TTI functionality.
Solution Approach 2:
The patent introduces dynamic switching between different TTI lengths (short and long TTIs) based on traffic conditions and QoS requirements. The system can adaptively select TTI duration, allowing optimization of latency for time-sensitive traffic while maintaining compatibility with legacy long TTI operations, thereby reducing overall system complexity.
2Productivity
If short TTI durations are implemented, then data rates improve, but control signaling complexity increases
Solution Approach 1:
The patent uses a common grant transmitted in advance that pre-configures short TTI parameters including duration, resource allocation, and modulation schemes. This preliminary configuration eliminates the need for repeated detailed signaling for each short TTI transmission, reducing control signaling complexity while enabling high data rate transmissions.
Solution Approach 2:
The common grant structure is designed to be universal, supporting multiple short TTI configurations and serving different traffic types. This multi-functional approach consolidates various control functions into a single signaling mechanism, reducing overall signaling complexity while maintaining flexibility for high data rate operations.
3Adaptability or versatility
If dynamic switching between TTI lengths is enabled, then resource utilization improves, but implementation complexity increases
Solution Approach 1:
The patent implements dynamic TTI length switching where the system can adaptively select between short and long TTIs based on real-time traffic conditions, QoS requirements, and channel state. This dynamic adaptation optimizes resource utilization by using short TTIs for time-sensitive traffic and long TTIs for bulk data transmission, while the standardized switching mechanism keeps implementation complexity manageable.
Solution Approach 2:
The patent changes the TTI duration parameter dynamically based on traffic requirements. The system monitors traffic characteristics and adjusts the TTI length parameter accordingly, enabling optimal resource utilization for different service types while maintaining a unified control framework that limits implementation complexity.
Data Source
AI summary
The disclosure relates to signalling of transmissions with shortened TTI. The disclosure further relates to an RBS and a method performed at the RBS of scheduling resources for a wireless communication device. The disclosure still further relates to a wireless communication device and a method performed at the wireless communication device of being granted data transmission or data reception. In a first aspect of the disclosure, a method performed at an RBS is provided for scheduling resources for a wireless communication device including indicating a grant of a resource for the wireless communication device to transmit or receive data based on DCI and a position of the DCI within a data frame of a downlink control channel.