Gradual network system and data transmission method when the system switchover

Abstract

The invention discloses an evolution network system and a data transmission method when the system is switched. The system includes an access gateway, at least two evolved base stations, and a terminal. The access gateway and the terminal transmit data through the evolved base station. The evolved base station includes a handover decision module, which is used to buffer data in the evolved base station where the handover occurs according to the service mode. Size and channel quality select a handover data transmission method, and use the handover data transmission method to transmit data to a terminal or other evolved base stations. The evolved base station also includes a transmission decision module, which is used to decide whether to suspend air interface data transmission according to the channel quality indicator parameter and execute the handover immediately during the handover process of data transmission. The invention also discloses a data transmission method when the evolution network system is switched. It selects different handover data transmission methods according to different situations, so as to reduce discarded and cached data during the handover process of the evolved network.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an evolved network and a method for data transmission when the evolved network is switched. Background technique [0002] Considering the competitiveness of future networks, 3GPP is studying a new evolved network architecture to meet the application requirements of mobile networks in the next ten years or even longer, including the evolution of system architecture (System Architecture Evolution, SAE) and access network Long Term Evolution (Long Term Evolution, LTE). The evolved network is also called an evolved UMTS terrestrial radio access network (Evolved UMTS Terutorial Radio Access Network, E-UTRAN). The goal of network evolution is to provide a low-latency, high data rate, high system capacity and coverage, low-cost, completely IP-based network. Since it is a brand new network architecture, all nodes, functions and processes of the existing architecture will u...

AI Technical Summary

Problems solved by technology

like Image 6 As shown, but in fact, some of SDU2 may have been delivered to the terminal. It is a waste if the target evolved base station sends it again, that is, if it is forwarded to the target evolved base station and then resends the data, the source evolved base station has already delivered it and waits for confirmation The SDU data will cause the terminal to repeatedly receive part of the received PDU data

[0020] If there is no backup SDU data, the PDU data must be forwarded to ensure lossless, which will inevitably forward the internal format data of the PDU of the source evolved base station to the target evolved base station, and the forwarding of the internal data of the PDU requires additional encapsulation, and the source evolved The internal data format of the base station is often different from the internal data format of the target evolved base station, which will cause cumbersome data processing between the two evolved base stations, and even data transmission errors

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