MDT Log Data Transfer via Segmented PDCP SDUs
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Solution Overview
Problem
The size of MDT log data buffered during idle or connected states may exceed 8188 bytes, causing base stations to fail in retrieving the entire data due to PDCP size constraints, and they are unaware of the data size stored by user equipment.
Innovation Solution
A method and apparatus where user equipment indicates the availability and size of MDT measurement information to the base station, allowing for partial data transfer with leftover indicators, repeating the transfer process until all data is successfully transferred.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MDT log data is buffered during idle or connected states, then measurement information is collected for network optimization, but the data size may exceed PDCP size constraints (8188 bytes) causing incomplete retrieval
Solution Approach 1:
The MDT log data transfer process is segmented into multiple PDCP SDUs when the total data size exceeds 8188 bytes. The UE divides the buffered MDT log data into chunks that fit within PDCP size constraints, transmitting them sequentially across multiple UL information transfer procedures until complete data delivery is achieved.
2Device complexity
If the base station retrieves MDT log data using a single PDCP SDU, then the transfer process is simple, but the base station cannot retrieve the entire data when size exceeds 8188 bytes
Solution Approach 1:
The UE provides feedback to the base station regarding the size of buffered MDT log data and the number of PDCP SDUs required for complete transfer. This feedback mechanism enables the base station to initiate multiple UL information transfer procedures with appropriate configuration, ensuring complete data retrieval while maintaining efficient resource utilization.
3Loss of information
If the base station is unaware of MDT log data size, then signalling overhead is reduced, but the base station fails to successfully retrieve the entire MDT log data
Solution Approach 1:
The UE performs preliminary action by indicating the availability and size of MDT log data to the base station before the actual data transfer begins. This preliminary indication includes information about the total data size and the number of PDCP SDUs required, enabling the base station to prepare appropriate reception resources and configuration for complete data retrieval.
Data Source
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AI summary
The present invention provides a method and system of providing minimization drive test (MDT) measurement information to a base station in a wireless communication network. In one embodiment, a method includes indicating availability of MDT measurement information logged by user equipment to a base station in a wireless network environment. The method further includes receiving an information request message to transfer the MDT measurement information in response to the indication. The method includes transmitting an information response message including at least a portion of the MDT measurement information to the base station, where the information response message indicates whether any portion of MDT measurement information is leftover with the user equipment. The method then includes repeating the above steps of receiving and transmitting till the entire MDT measurement information is transferred to the base station.