Short TTI System Information Scheduling for Wireless Latency Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly 3GPP LTE, face challenges in reducing packet data latency, which affects system responsiveness and throughput, and existing techniques such as pre-scheduling strategies and reduced transmission time intervals do not fully address latency efficiency.
Innovation Solution
A method and apparatus for receiving system information and paging in a short transmission time interval (TTI), where user equipment (UE) and mobility management entity (MME) indicate and support short TTI, allowing for efficient scheduling and transmission of system information and paging messages in a wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If normal TTI is used for system information and paging transmission, then system compatibility is maintained, but packet data latency is increased
Solution Approach 1:
The patent segments the transmission time interval into normal TTI and short TTI, allowing different types of information to be transmitted in different time intervals. System information and paging messages are transmitted in short TTI to reduce latency, while maintaining compatibility with normal TTI operations
Solution Approach 2:
The patent introduces dynamic TTI length adjustment, where the transmission time interval can be dynamically changed between normal and short durations based on the type of information being transmitted and network conditions, enabling flexible optimization of latency without sacrificing compatibility
2Loss of time
If short TTI is used for system information and paging, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent designs the short TTI mechanism to be universally applicable across different device types and network configurations. The same short TTI framework can handle system information, paging messages, and data transmissions, reducing the need for device-specific implementations and lowering overall complexity
Solution Approach 2:
The patent changes the time interval parameter from fixed normal TTI to variable TTI length, allowing the system to switch between normal and short durations. This parameter change enables latency reduction while maintaining a unified transmission framework that devices can handle with minimal complexity increases
3Productivity
If more transmission attempts are made within delay bound, then throughput is improved, but radio resource consumption increases
Solution Approach 1:
The patent implements periodic transmission opportunities within the short TTI framework, allowing multiple transmission attempts at regular intervals within the delay bound. This periodic action increases throughput by enabling retransmissions while the shortened TTI ensures that the overall energy consumption remains controlled due to the reduced time window for transmissions
Data Source
AI summary
A method and apparatus for receiving system information in a wireless communication system is provided. A user equipment (UE) receives an indication indicating whether a cell supports a short transmission time interval (TTI) from the cell, and receives at least one of normal TTI system information in a normal TTI or short TTI system information in the short TTI from the cell according to the received indication. That is, an eNodeB (eNB) may schedule separate system information block type 1 (SIB1) and/or SI messages broadcast in short TTI.