Transparent NR PDCP Configuration Forwarding in LTE-NR Dual Connectivity
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Solution Overview
Problem
In the context of 5G network construction, particularly in LTE-NR DC scenarios, there is a challenge in how a terminal obtains an NR PDCP configuration due to differences in RATs between master and secondary base stations, leading to potential misinterpretation and discard of content by the master base station.
Innovation Solution
The proposed solution involves the secondary base station directly sending the NR PDCP configuration and identification information of a DRB to the master base station through a dedicated interface, where the master base station forwards this information to the terminal without parsing, ensuring transparent transmission and avoiding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master base station parses the NR PDCP configuration generated by the secondary base station, then the configuration can be processed and forwarded, but the master base station cannot parse the content due to different RATs and discards it
Solution Approach 1:
The master base station acts as an intermediary that transparently forwards the NR PDCP configuration from the secondary base station to the terminal without attempting to parse or process it. This mediator approach resolves the contradiction by allowing the configuration to pass through the master base station unchanged, avoiding the parsing failure while maintaining system architecture where the master base station coordinates the dual connectivity.
2Reliability
If the secondary base station sends the NR PDCP configuration directly to the terminal, then the configuration can be delivered, but the existing LTE DC mechanism prevents direct communication between secondary base station and terminal
Solution Approach 1:
The master base station is given multiple functions: it maintains its traditional role of coordinating LTE DC while also serving as a transparent conduit for NR-specific configurations. This multi-functionality allows the system to maintain the existing LTE DC mechanism structure while adapting it to support NR configuration delivery, resolving the contradiction between mechanism rigidity and delivery requirement.
3Reliability
If the master base station forwards the NR PDCP configuration without parsing, then transmission errors are avoided, but the master base station cannot associate the configuration with the correct DRB
Solution Approach 1:
The secondary base station pre-associates the NR PDCP configuration with the DRB identification information before sending it to the master base station. This preliminary action ensures that when the master base station forwards the configuration transparently, the terminal receives both the configuration and its associated DRB identifier, enabling correct configuration application without requiring the master base station to perform complex parsing or association operations.
Data Source
AI summary
Embodiments of this application disclose an information processing method, a base station, and a terminal. The method includes: receiving, by a master base station, a new radio packet data convergence protocol (NR PDCP) configuration and identification information of a data radio bearer (DRB) corresponding to the NR PDCP configuration from a secondary base station; and sending, by the master base station, the NR PDCP configuration and the identification information of the DRB to a terminal, where the master base station and the secondary base station are base stations of different radio access technologies (RATs).