PDCP Data Encapsulation for Accurate Radio Bearer Handover
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Solution Overview
Problem
In 5G communication systems, during cell handover, the target access network device faces challenges in accurately forwarding PDCP data using the correct radio bearer, especially when the forwarding tunnel operates at a session or group granularity, leading to inefficiencies in data transmission rates.
Innovation Solution
The source access network device encapsulates indication information, such as radio bearer identifiers and quality of service markings, in the encapsulation header of PDCP data and sends it to the target access network device, enabling accurate routing of PDCP data to the correct radio bearer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the forwarding tunnel operates at session or group granularity, then the network structure is simplified and resource utilization is improved, but the target base station cannot accurately determine the correct radio bearer for PDCP data transmission
Solution Approach 1:
The patent introduces indication information as an intermediary element that bridges the gap between the simplified forwarding tunnel structure and the required radio bearer identification. This indication information, carried within the PDCP data structure, enables the target base station to accurately determine the correct radio bearer despite the aggregated tunnel granularity, thus resolving the contradiction between network simplification and precise bearer identification
Solution Approach 2:
The source base station performs preliminary action by embedding indication information about the radio bearer into the PDCP data before forwarding it through the tunnel. This advance preparation ensures that when the data reaches the target base station, the necessary information for correct bearer identification is already present, eliminating the need for complex real-time determination mechanisms
2Device complexity
If the target base station uses generic forwarding tunnels without detailed bearer information, then device complexity is reduced, but data transmission rate decreases due to inability to route data through correct radio bearers
Solution Approach 1:
The PDCP data structure is enhanced to carry its own identification information (indication information) that enables self-routing at the target base station. This self-service mechanism allows the data to effectively tag itself with the correct radio bearer identification, maintaining high transmission rates without requiring complex external routing mechanisms at the target base station
Data Source
AI summary
This application provides a data transmission method and device. In a process in which a terminal device is handed over from a source access network device to a target access network device, the source access network device processes buffered packet data convergence protocol (PDCP) data, so that when a forwarding tunnel is a tunnel of a session granularity or a group granularity, the target access network device accurately forwards data in the handover process. The method includes: encapsulating, by a source access network device, indication information in an encapsulation header of PDCP data, where the indication information is used to indicate a radio bearer used for sending the PDCP data by a target access network device; and sending, by the source access network device to the target access network device, the PDCP data in which the indication information is encapsulated.