Scheduling Request Transmission for Variable TTI Lengths
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Solution Overview
Problem
There is a lack of technical solutions for scheduling request (SR) feedback in Long Term Evolution (LTE) systems where terminals support different transmission time intervals, as the existing SR feedback mechanism is not applicable for varying lengths of transmission time intervals.
Innovation Solution
A method and device for transmitting SRs, where a terminal obtains and configures different Physical Uplink Control Channel (PUCCH) resources for SRs corresponding to different transmission time intervals (TTIs), and decides whether to transmit SRs on these resources, allowing for SR feedback with varying TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the legacy SR feedback mechanism is used, then the SR transmission is simple and standardized, but it cannot support terminals with different TTI lengths
Solution Approach 1:
The patent segments the SR feedback mechanism by introducing separate PUCCH resources for different TTI lengths. Specifically, it defines first PUCCH resources for long TTI SRs and second PUCCH resources for short TTI SRs, allowing the system to handle multiple TTI configurations without requiring a complete redesign of the SR feedback mechanism.
Solution Approach 2:
The patent implements dynamic adaptability by enabling terminals to flexibly select between different PUCCH resources based on their configured TTI lengths. The terminal can dynamically switch between using first PUCCH resources (for long TTI) and second PUCCH resources (for short TTI), making the SR feedback mechanism adaptable to varying transmission time interval requirements.
2Adaptability or versatility
If separate PUCCH resources are allocated for different TTI lengths, then SR feedback for multiple TTI lengths is enabled, but PUCCH resource management becomes more complex
Solution Approach 1:
The patent divides PUCCH resources into distinct segments: first PUCCH resources allocated for long TTI SR transmissions and second PUCCH resources allocated for short TTI SR transmissions. This segmentation allows the network to manage resources separately for different TTI lengths, reducing the complexity of managing a single unified resource pool for diverse requirements.
Solution Approach 2:
The network performs preliminary allocation of PUCCH resources before SR transmission occurs. The network configures and assigns specific PUCCH resources for different TTI lengths in advance, so that when a terminal needs to transmit an SR, it can directly use the pre-allocated appropriate resource without requiring complex real-time resource allocation decisions.
3Speed
If SR transmission periodicity is shortened to support shorter TTI, then faster SR feedback is achieved, but the legacy sub-frame based periodicity definition becomes inadequate
Solution Approach 1:
The patent changes the fundamental parameter of SR transmission periodicity from being defined in sub-frames (legacy approach) to being defined in slots (new approach). This parameter change enables the SR feedback mechanism to operate at shorter time intervals, achieving faster feedback speeds that are compatible with shortened TTI lengths while providing a clear and standardized periodicity configuration method.
Data Source
AI summary
A scheduling request transmission method and a related device, used to solve the technical problem wherein no technical solution is currently available for providing SR feedback for terminals supporting different transmission time intervals. The method comprises: a terminal acquiring a first physical uplink control channel (PUCCH) resource corresponding to a first SR and a second PUCCH resource corresponding to a second SR, the first PUCCH resource being different from the second PUCCH resource; the first SR corresponding to a first transmission time interval (TTI) length, and the second SR corresponding to a second TTI length, the first TTI length being different from the second TTI length; the terminal determining whether the first SR and/or the second SR require transmission; if the first SR and/or the second SR require transmission, the terminal transmitting the first SR and/or the second SR by means of a PUCCH.