Dynamic Scheduling Request Resource Configuration via Physical Layer Signaling
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Solution Overview
Problem
Current 4G LTE systems incur unnecessary system overhead due to semi-static RRC configuration and periodic reservation of scheduling request (SR) resources, leading to inefficiencies in uplink spectral efficiency and peak data rate, especially in systems with a large number of users.
Innovation Solution
The eNB configures and enables/disables SR resources using physical layer signaling (DL/UL grant messages) instead of traditional RRC signaling, allowing dynamic management of SR resources, including parameters like period, starting subframe, resource index, and repetition number, to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic SR resources are reserved using semi-static RRC configuration, then SR resources are guaranteed for UE, but system overhead increases and uplink spectral efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from semi-static RRC configuration to dynamic physical layer signaling for SR resource allocation. The gNB can flexibly adjust SR resource configuration in real-time based on current system conditions, user activity patterns, and resource availability, rather than relying on fixed periodic reservations. This dynamic approach allows the system to adapt SR resource allocation to actual needs, reducing overhead when SR traffic is low while maintaining reliability when needed.
Solution Approach 2:
The patent implements parameter changes by modifying key SR resource parameters (period, offset, resource index) through dynamic signaling rather than fixed configuration. The gNB can change these parameters adaptively based on traffic conditions, allowing the system to optimize the balance between SR resource guarantee and overhead reduction. This enables flexible adjustment of SR periodicity and resource location without requiring full RRC reconfiguration.
2Reliability
If periodic SR resources are reserved using semi-static RRC configuration, then SR resources are guaranteed for UE, but uplink spectral efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from semi-static RRC configuration to dynamic physical layer signaling for SR resource allocation. The gNB can flexibly adjust SR resource configuration in real-time based on current system conditions, user activity patterns, and resource availability, rather than relying on fixed periodic reservations. This dynamic approach allows the system to adapt SR resource allocation to actual needs, reducing overhead when SR traffic is low while maintaining reliability when needed.
Solution Approach 2:
The patent addresses periodic action by making the SR resource periodicity itself dynamic rather than fixed. Instead of committing to rigid periodic SR opportunities, the system can adjust the periodicity based on actual SR traffic patterns and uplink resource availability. This allows the system to concentrate SR opportunities when needed and reduce them when unnecessary, improving overall uplink spectral efficiency while maintaining SR functionality.
3Productivity
If more users are served by eNB, then system capacity increases, but system overhead from periodic SR resources increases
Solution Approach 1:
The patent applies universality by using the same dynamic signaling mechanism for multiple purposes: SR resource allocation, uplink grant assignment, and system resource optimization. The physical layer signaling that provides UL grants can simultaneously convey SR resource configuration information, allowing the system to manage multiple functions through a unified dynamic mechanism rather than separate semi-static configurations for each function.
Solution Approach 2:
The patent applies dynamics by transitioning from semi-static RRC configuration to dynamic physical layer signaling for SR resource allocation. The gNB can flexibly adjust SR resource configuration in real-time based on current system conditions, user activity patterns, and resource availability, rather than relying on fixed periodic reservations. This dynamic approach allows the system to adapt SR resource allocation to actual needs, reducing overhead when SR traffic is low while maintaining reliability when needed.
Data Source
AI summary
A method for providing scheduling request resources to a user equipment involves a wireless network node (e.g., an eNB) transmitting a configuration of scheduling request resources to the user equipment via radio resource control signaling, and the wireless network node enabling the scheduling request resources by transmitting a message to the user equipment via physical layer signaling. The message that enables the scheduling request resources may be transmitted as part of an uplink grant or downlink grant. In some implementations, the enabling message maps to one of several sets of scheduling request resources, which the wireless network node has previously communicated to the user equipment via radio resource control signaling. In other implementations, the selection of which set of scheduling request resources is to be enabling is made by the user equipment based on implicit signaling from the wireless node.