Dynamic Scheduling Request Resource Allocation in Wireless Terminals
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing Scheduling Requests (SR) in next-generation RAT, particularly in supporting massive Machine Type Communications (mMTC) and Ultra-Reliable and Low Latency Communication (URLLC), where traditional SR methods lead to resource inefficiencies due to fixed subframe configurations and limited resource allocation.
Innovation Solution
A method and terminal configuration that dynamically allocate SR transmission resources by receiving information on periodicity and resource regions, utilizing Downlink Control Information (DCI) to check for additional SR transmission opportunities in non-standard subframes, allowing for flexible resource allocation based on SR zone values, and distinguishing SR transmission regions using Resource Blocks (RB), Orthogonal Cover Codes (OCC), and Cyclic Shift (CS) values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fixed subframe configurations are used for SR transmission, then system simplicity is maintained, but resource efficiency deteriorates due to inability to dynamically allocate resources
Solution Approach 1:
The patent implements dynamic SR resource allocation by introducing a DCI field that indicates additional SR transmission opportunities in non-periodic subframes. The network can dynamically configure SR transmission resources based on current system conditions, allowing terminals to transmit SR in both periodic subframes (according to sr-Period) and additional subframes (indicated by DCI), thereby improving resource efficiency without requiring complete redesign of the SR mechanism
Solution Approach 2:
The patent changes the parameter of SR transmission by introducing a new DCI field that dynamically modifies SR resource allocation. Instead of using fixed periodicity alone, the system now uses a combination of periodic configuration (sr-Period) and dynamic indication (DCI field with specific values), allowing flexible adjustment of SR transmission opportunities based on network conditions
2Loss of time
If additional SR transmission opportunities are provided in non-periodic subframes, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring SR periodicity through RRC signaling (sr-Period parameter) and pre-defining the structure of DCI fields that will indicate additional SR opportunities. Terminals are prepared in advance to monitor both periodic subframes and potential additional subframes, enabling faster SR transmission when needed without requiring complex real-time decision-making during SR events
Solution Approach 2:
The patent introduces DCI as an intermediary mechanism between the network and terminal for SR resource allocation. The DCI field acts as a mediator that carries information about additional SR transmission opportunities, simplifying the interaction between network and terminal while enabling flexible resource allocation without direct complex signaling for each SR opportunity
3Adaptability or versatility
If SR resources are dynamically allocated based on DCI, then adaptability is improved, but device complexity increases due to additional checking requirements
Solution Approach 1:
The patent applies local quality by making SR resource allocation adaptive at specific locations (subframes) rather than uniformly across all subframes. The DCI field indicates specific subframes where additional SR opportunities are available, allowing the terminal to maintain simple periodic SR transmission in standard subframes while adding complexity only where needed (in non-periodic subframes with DCI indication)
Data Source
AI summary
A method by which a terminal transmits a scheduling request (SR) in a wireless communication system, according to the present invention, comprises the steps of: receiving information on periodicity of SR transmission and a resource region for periodical SR transmission; receiving downlink control information (DCI) which includes a field related to an SR transmission region in a first subframe; and confirming whether the resource for the SR transmission of the terminal is allocated in the first subframe, even if the first subframe is not the subframe for the periodical SR transmission of the terminal, according to the periodicity of the SR transmission, when a SR field indicates a specific value.