PUR PUSCH Timing Advance Validation for 5G
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Solution Overview
Problem
In the context of 5G wireless communication, the existing mechanisms for pre-allocated resource-based PUSCH transmission lack effective validation of timing advance (TA) values, leading to potential data transmission delays and increased power consumption, especially in scenarios where direct data transmission on PUSCH within pre-allocated UL resources is considered without associated PRACH preamble transmission.
Innovation Solution
A method for validating TA values for PUR-based PUSCH transmission is introduced, involving criteria such as TA validation rules for RRC_INACTIVE mode, unchanged serving cell, and measured RSRP thresholds, ensuring valid TA values are used before data transmission, thereby optimizing data transmission efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pre-allocated resource-based PUSCH transmission is used without TA validation, then data transmission speed is improved, but transmission reliability deteriorates due to potential timing errors
Solution Approach 1:
The patent performs timing advance validation before allowing PUSCH transmission by checking whether the time alignment timer is running and whether the serving cell is unchanged. This preliminary validation ensures timing accuracy is verified in advance, preventing transmission errors while maintaining fast data transmission when conditions are met.
2Reliability
If TA validation criteria are implemented, then transmission reliability is improved, but device complexity increases due to additional validation steps
Solution Approach 1:
The UE autonomously validates its own timing advance status by checking internal state variables (time alignment timer status, serving cell identity) without requiring external validation from the network. This self-service approach maintains reliability while minimizing additional complexity by using already-available UE state information.
Solution Approach 2:
The patent reuses existing UE state variables (time alignment timer, serving cell configuration) for multiple purposes: both for normal operation control and for TA validation. This multi-functionality approach avoids introducing dedicated validation variables, thereby reducing complexity while ensuring reliability.
3Use of energy by moving object
If small data transmission in RRC_INACTIVE mode is enabled, then power consumption is reduced, but measurement precision deteriorates due to limited measurement opportunities
Solution Approach 1:
The patent applies a RSRP threshold criterion for TA validation, requiring that measured RSRP exceeds a configured threshold. This partial validation approach (checking only against a threshold rather than full precision measurement) reduces measurement requirements and power consumption while maintaining sufficient accuracy for determining whether the UE remains in the same coverage area.
Data Source
AI summary
Provided herein are mechanisms on response of pre-allocated resource based PUSCH transmission. The disclosure provides an apparatus including processor circuitry. The processor circuitry is to: encode data, for transmission to an access node (AN) over a pre-allocated uplink (UL) resource (PUR) based physical uplink shared channel (PUSCH); start a timer once the data is transmitted; and monitor, based on the timer, a physical downlink control channel (PDCCH) to obtain a response of the AN to the transmission of the data. Other embodiments may also be disclosed and claimed.