Dynamic Scheduling Request Resource Allocation in LTE
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Solution Overview
Problem
Current methods for allocating radio resources for scheduling requests in LTE communication systems face inefficiencies, particularly in handling background traffic, leading to low utilization rates and increased transmission delays, due to fixed SR periods that do not adapt to dynamic traffic patterns.
Innovation Solution
A method for dynamically adjusting the dedicated SR (D-SR) period based on utilization rates and number of random access successes, allowing for semi-persistent configuration changes to optimize resource allocation and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed SR periods are used for resource allocation, then resource allocation is simple and stable, but utilization rates are low and transmission delays increase
Solution Approach 1:
The patent implements dynamic adjustment of SR resource periods based on traffic conditions. The eNB monitors uplink traffic patterns and dynamically changes the SR period configuration (e.g., between 1ms, 2ms, 5ms, 10ms, 20ms, 40ms, 80ms) to match actual traffic demands, transforming the static resource allocation into a dynamic system that adapts to varying utilization rates and reduces transmission delays
Solution Approach 2:
The patent changes the time parameter (SR period) of resource allocation based on monitored traffic conditions. By adjusting the SR period parameter dynamically according to uplink traffic patterns and utilization rates, the system optimizes resource utilization while maintaining manageable complexity through standardized adjustment levels
2Reliability
If dedicated SR resources are allocated per UE, then SR transmission is reliable, but control signaling overhead increases
Solution Approach 1:
The patent makes SR resources shared among multiple UEs instead of being dedicated to individual UEs. Multiple UEs can share the same SR resource configurations (periods and subframe offsets), allowing the system to maintain reliable SR transmission while reducing control signaling overhead by consolidating resource allocations across multiple users
Solution Approach 2:
The patent merges SR resources from multiple UEs into shared resource pools. By combining previously separate dedicated SR allocations into unified shared resources that multiple UEs can access, the system reduces overall control signaling overhead while maintaining transmission reliability through coordinated resource management
3Loss of substance
If SR period is extended to reduce overhead, then signaling overhead decreases, but transmission delay increases
Solution Approach 1:
The patent dynamically adjusts the SR period based on real-time traffic conditions and utilization rates. When traffic is heavy, shorter SR periods are used to reduce transmission delay; when traffic is light, longer SR periods are used to reduce signaling overhead. This dynamic adaptation resolves the trade-off between overhead reduction and delay prevention
4Adaptability or versatility
If random access procedure is used for uplink grant request, then connection establishment is flexible, but network resource consumption and power consumption increase
Solution Approach 1:
The patent pre-configures SR resources and periods for UEs before uplink data transmission is needed. By having SR resources ready in advance through semi-persistent scheduling, UEs can immediately transmit scheduling requests without initiating power-consuming random access procedures, thus reducing overall power consumption while maintaining connection flexibility
Data Source
AI summary
The present disclosure proposes a method of allocating resources for a scheduling request (SR), a user equipment using the same method, and a control node using the same method, which is related to dynamically adjusting a dedicated SR (D-SR) period which is a semi-persistently configured D-SR resource used to transmit a SR. The method, the user equipment, and the control node would perform functions including establishing a connection between the user equipment and the control node in order to transmit uplink data, the user equipment transmitting through the connection an assisting information to the control node after establishing the connection to adjust the D-SR period, and the user equipment obtaining a second D-SR period after transmitting the assisting information to the control node.