Dynamic TTI Scheduling Request Modes for Wireless Latency
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Solution Overview
Problem
Current wireless communication systems, particularly LTE, face challenges in providing sufficient frequency for scheduling requests due to periodicity limitations, which hinder lower latency communications and require more frequent resource allocation opportunities.
Innovation Solution
Implementing a time division duplexing (TDD) frame structure that allows dynamic switching between uplink and downlink transmission time intervals (TTIs), enabling periodic, aperiodic, and opportunistic scheduling request modes to increase the frequency and flexibility of scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If periodic SR resources are used in LTE, then resource allocation is simplified and system stability is maintained, but scheduling request frequency is insufficient for lower latency communications
Solution Approach 1:
The patent implements three SR transmission modes (periodic, aperiodic, and opportunistic) that dynamically adapt to different communication scenarios. The network can configure which mode to use based on traffic conditions and latency requirements, transforming the static periodic SR mechanism into a dynamic system that can respond to varying demands for scheduling requests.
Solution Approach 2:
The patent changes the fundamental parameter of SR transmission from fixed periodic intervals to variable timing mechanisms. Aperiodic SR allows transmission triggered by specific events or conditions, while opportunistic SR enables transmission during available uplink opportunities, fundamentally altering when SR can be sent compared to traditional periodic approaches.
2Productivity
If preconfigured SR resources with fixed periodicity are used, then system complexity is reduced and operation is simplified, but communication rates cannot support lower latency requirements
Solution Approach 1:
The patent creates a universal SR resource allocation framework that can serve multiple functions and scenarios. The same resource allocation mechanism supports periodic, aperiodic, and opportunistic SR modes, allowing the system to handle different traffic types and latency requirements through a single configurable framework rather than separate mechanisms for each scenario.
Solution Approach 2:
The network performs preliminary configuration of SR resources and mode selection before actual data transmission begins. By pre-configuring which SR mode to use and allocating appropriate resources in advance, the system prepares the communication channel to support lower latency requirements without adding complexity during active data transmission.
3Loss of time
If frequent SR opportunities are provided to reduce latency, then communication performance improves, but system resource overhead increases
Solution Approach 1:
The opportunistic SR mode enables continuous monitoring and transmission opportunities whenever uplink resources are available, rather than waiting for fixed periodic intervals. This creates a continuous action framework where SR can be transmitted as soon as conditions permit, reducing delay without requiring dedicated frequent SR resources.
Solution Approach 2:
The system allows SR transmission to occur naturally when uplink resources are already allocated for other purposes. Instead of dedicating separate resources for SR, the mechanism utilizes existing uplink allocations, allowing SR to "self-service" using already-allocated resources and avoiding additional overhead.
Data Source
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AI summary
Various aspects described herein relate to communicating a scheduling request (SR) in a wireless network. A frame structure that allows dynamic switching of transmission time intervals (TTI) between uplink and downlink communications may be used to communicate with a network entity. At least one SR mode can be selected for SR transmission to the network entity in one or more of the TTIs configured for uplink communications based at least in part on the frame structure. The SR can be transmitted to the network entity in at least one uplink TTI of the one or more TTIs configured for uplink communications based at least in part on the at least one SR mode.