Uplink Scheduling Request Type Segmentation for 5G Latency
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Solution Overview
Problem
The uplink resource scheduling mode in LTE cannot meet the requirements of a 5G network, particularly in terms of latency and reliability, due to the limitations imposed by the sr-prohibitTimer which restricts consecutive scheduling requests, leading to resource scheduling delays.
Innovation Solution
A method where a terminal device determines a scheduling request type based on pre-obtained indication information when a buffer status report is triggered, allowing the access network device to differentiate between scheduling requests and allocate resources accordingly, enabling quick and proper resource scheduling by disabling the scheduling request prohibit timer for high-priority services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sr-prohibitTimer is used to limit the time interval of sending two consecutive SRs, then the system avoids excessive scheduling requests, but the resource scheduling delay increases and cannot meet 5G latency requirements
Solution Approach 1:
The patent segments the scheduling request mechanism by introducing multiple SR types (first type and second type) with different priorities. High-priority services can use the first type of SR that is not restricted by the sr-prohibitTimer, while other services use the second type that is subject to timer control. This segmentation allows the system to simultaneously maintain scheduling control and reduce latency for critical services.
Solution Approach 2:
The patent implements dynamic scheduling by allowing the UE to dynamically select between different SR types based on service priority requirements. The network can dynamically configure multiple SR resources and the UE dynamically chooses the appropriate SR type when triggering conditions are met, enabling adaptive response to varying service demands without being constrained by fixed timer limitations.
2Stability of the object's composition
If the LTE uplink scheduling mode is used, then the system maintains stable operation with timer-based control, but it cannot meet the latency and reliability requirements of 5G services
Solution Approach 1:
The patent applies local quality by assigning different properties to different SR types. The first type of SR is configured with high-priority properties (not subject to sr-prohibitTimer restriction) for specific high-priority services, while the second type maintains standard properties (subject to timer control) for other services. This allows the system to maintain overall stability while providing specialized fast-track scheduling for critical services.
Solution Approach 2:
The patent changes key scheduling parameters by introducing multiple SR types with different timer configurations. The first SR type has the parameter sr-ProhibitTimer set to not apply (or effectively infinite), while the second SR type uses the standard sr-ProhibitTimer value. This parameter differentiation enables the system to meet diverse service requirements within a unified scheduling framework.
3Device complexity
If a single scheduling request type is used, then the system simplifies the scheduling process, but it cannot provide differentiated resource allocation for different service priorities
Solution Approach 1:
The patent implements multi-functionality by designing a unified scheduling framework that supports multiple SR types. The same SR triggering mechanism and resource allocation procedures are used, but the system universally supports both first-type and second-type SRs with different priority levels and timer configurations, allowing a single system to serve multiple service requirements.
Solution Approach 2:
The patent adds a new dimension to the scheduling system by introducing SR type differentiation. Instead of a single-dimensional scheduling approach, the system now operates in a multi-dimensional space that includes SR type selection, priority levels, and differential timer applications. This additional dimension enables service differentiation while maintaining the underlying scheduling structure.
Data Source
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AI summary
This application provides a method for scheduling an uplink transmission resource, and a device. The method includes: determining, by a terminal device, a first scheduling request according to pre-obtained first indication information when a first BSR is triggered because to-be-sent data exists on a first logical channel of the terminal device, where the first indication information is used to indicate a correspondence between a logical channel and a type of a scheduling request, and the first scheduling request includes a type of the first scheduling request; sending, by the terminal device, the first scheduling request to an access network device; and receiving, by the terminal device, first uplink scheduling information sent by the access network device, where the uplink scheduling information is used to indicate a first uplink resource used by the terminal device to send uplink data to the access network device. The access network device may distinguish between scheduling requests of a service based on types of the scheduling requests, to quickly and properly schedule a resource for the terminal device.