Uplink Transmission Scheduling for Shortened TTI Efficiency
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Solution Overview
Problem
Current LTE systems face challenges in efficiently transmitting data after shortening the Transmission Time Interval (TTI) length, lacking a definite scheme for data transmission, which affects time delay performance and transmission efficiency.
Innovation Solution
An uplink transmission method and device that detect and schedule UL grants on specific time-frequency resources, allowing UEs to perform uplink transmission based on predefined scheduling information, reducing blind detection and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the TTI length is shortened to reduce time delay, then the time delay performance is improved, but the system lacks a definite scheme for data transmission which reduces transmission efficiency
Solution Approach 1:
The patent segments the transmission time interval into shorter units (e.g., mini-slots or sub-slots) within the traditional 1ms subframe structure. This allows the system to transmit data in smaller time chunks, reducing the average time delay while maintaining a structured scheduling framework that ensures transmission efficiency through defined resource allocation rules.
2Speed
If the TTI length is shortened to improve response speed, then the processing speed is improved, but the device complexity increases due to the need for more frequent scheduling and resource management
Solution Approach 1:
The patent employs semi-persistent scheduling where resource allocations are pre-configured for a certain period. This preliminary action reduces the need for frequent dynamic scheduling decisions, thereby lowering the processing burden and device complexity while still enabling fast response times through the shorter TTI structure when dynamic scheduling is needed.
3Adaptability or versatility
If conventional LTE frame structure is used with shortened TTI, then the compatibility is maintained, but the transmission efficiency deteriorates due to lack of definite transmission scheme
Solution Approach 1:
The patent introduces dynamic flexibility by allowing the system to adaptively select between different transmission schemes and resource allocation methods based on traffic conditions. This dynamic approach maintains compatibility with conventional LTE frame structures while enabling efficient transmission through optimized resource utilization and flexible scheduling options tailored to specific traffic patterns.
Data Source
AI summary
An uplink transmission method and an uplink transmission device are provided. The uplink transmission method includes: detecting an UL grant on a target time-domain resource and a target frequency-domain resource in a first time unit, the UL grant being to schedule one or more UEs to perform uplink transmission in a target time unit, a time unit having a predefined length of B1 subframes or B2 symbols, where B1 and B2 are each an integer greater than or equal to 1; acquiring scheduling information for the UE in the target time unit from the UL grant; and performing the uplink transmission on a time-domain resource and a frequency-domain resource scheduled in the target time unit in accordance with the scheduling information.