Terminal Device Uplink Grant Management via Semi-Persistent Scheduling
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Solution Overview
Problem
The existing radio communication systems, particularly in LTE, lack a concrete procedure for efficient uplink data transmission, which hinders optimal data exchange between terminal devices and base stations.
Innovation Solution
The implementation of a terminal device and base station device configuration that includes a reception unit for receiving parameters in RRC messages and downlink control information, with a higher layer processing unit to manage uplink grants, specifically delivering or clearing them based on Semi-Persistent Scheduling indications, ensuring efficient uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Semi-Persistent Scheduling is used for uplink data transmission, then transmission efficiency is improved, but device complexity increases due to the need to manage configured uplink grants and interpret parameter configurations
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink grants through RRC signaling before actual data transmission. The terminal device receives and stores configured uplink grants in advance, which are then activated by PDCCH indications. This allows the device to have transmission resources ready beforehand, improving uplink transmission efficiency while managing complexity through structured pre-configuration procedures
Solution Approach 2:
The patent implements dynamics by allowing the configured uplink grants to be dynamically activated or deactivated based on PDCCH indications. The terminal device can switch between different uplink grant configurations depending on network conditions and traffic requirements, enabling flexible adaptation while maintaining the benefits of pre-configured resources
2Reliability
If configured uplink grants are stored and managed, then uplink transmission reliability is improved, but processing time increases due to the need to deliver or clear grants between HARQ entities
Solution Approach 1:
The patent applies preliminary action by pre-establishing the configured uplink grant storage mechanism and delivery pathways to HARQ entities before transmission is needed. The terminal device maintains a structured storage location for configured grants and has predefined delivery procedures, reducing the processing time required when activation or deactivation is commanded
Solution Approach 2:
The patent implements self-service by enabling the terminal device to autonomously manage the configured uplink grants, including storing, delivering to HARQ entities, and clearing them based on PDCCH indications. This self-managed approach reduces the need for extensive network control signaling and minimizes processing overhead
Data Source
AI summary
Uplink data is transmitted efficiently. A terminal device includes: a reception unit configured to receive a parameter included in an RRC message and receive downlink control information, by using a physical downlink control channel; and a higher layer processing unit configured to store an uplink grant as a configured uplink grant. The configured uplink grant is delivered to a HARQ entity in a case that the parameter is configured and a Semi-Persistent Scheduling release is indicated by using the downlink control information, and the configured uplink grant is cleared in a case that the parameter is not configured and the Semi-Persistent Scheduling release is indicated by using the downlink control information.