Gradual network system and data transmission method when the system switchover

A data transmission method and evolution network technology, which is applied in the field of data transmission during evolution network switching, and can solve problems such as repeated reception, data transmission error, and inconsistency

Active Publication Date: 2007-10-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As shown in Figure 6, but in fact, part 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 forwards to the target evolved base station and retransmits the data Sending SDU data waiting for confirmation 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 no loss, 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 The internal data format of the evolved 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.

Method used

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  • Gradual network system and data transmission method when the system switchover
  • Gradual network system and data transmission method when the system switchover
  • Gradual network system and data transmission method when the system switchover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] Embodiment 1: AGW switching method for transmitting data

[0154] As shown in FIG. 7 , after evaluation, the source eNB can send out the buffered data that has not been delivered by the source eNB during the handover process: it includes undelivered PDU data and buffered SDU data.

[0155] The following describes in detail the data transmission process of the AGW switching data transmission method in this embodiment:

[0156] Step S1: The source eNB first sends a handover data delivery instruction to the access gateway (AGW), instructing the access gateway (AGW) to stop sending service data to the source eNB (Source E-NodeB).

[0157] The lossless service data in the cache of the access gateway (AGW) is no longer delivered to the source evolved base station, and is sent to the target evolved base station after the terminal (UE) switches to the target evolved base station (Target E-NodeB), and then the target evolved base station The base station sends it to the terminal....

Embodiment 2

[0170] Embodiment 2: SDU switching data transmission method

[0171] As shown in FIG. 8 , after evaluation, the source eNB cannot finish sending the SDU data not delivered but buffered in the source eNB during the handover process, but it can finish sending the PDU data not delivered.

[0172] At this time, the source evolved base station will try to finish sending the existing PDU data, that is, the data that has been segmented.

[0173] The process of transmitting data by the SDU switching data transmission method is described in detail below:

[0174] Step N1: First, the source evolved base station no longer performs segmentation processing on the unsent SDU data;

[0175] Step N2: The source evolved base station sends PDU data to the terminal; at the same time, it forwards (Forwarding) the SDU data buffered by the source evolved base station and sends it to the target evolved base station. After the handover is completed, the target evolved base station redistributes the ...

Embodiment 3

[0183] Embodiment 3: SDU_PDU switching data forward transmission method

[0184] As shown in Figure 9, if the source evolved base station (Source E-NodeB) has a large cache of lossless service data not delivered to the terminal (UE), the quality of the air interface is poor, or the terminal needs to perform fast handover, select SDU_PDU before switching data to the transfer method.

[0185] The following describes in detail the process of data transmission by the method of SDU_PDU switching data forward transmission:

[0186] Step M1: The source eNB sends a handover command immediately after making a handover decision, and forwards all the failed data of the source eNB, including SDU data and PDU data, to the target eNB (Target E-NodeB) .

[0187] Step M2: After the source eNB sends an instruction to the terminal, instructing the terminal to switch and synchronize with the target eNB, the terminal reports the receiving window state information table to the target eNB.

[01...

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Abstract

The invention discloses an evolution network system and its data transmission method during switching. The system includes Access Gateway, at least two evolution base stations and terminals, in which, Access Gateway and terminals transmit data through evolution base station that includes switching-decision module used to select switching data transmission method according to business model, cache data size and channels quality, and transmit data to the terminals or other base stations by this method. The base station also includes transmission-decision module, used to decide whether to pause transmission and immediately implement switch according to the parameters of channel quality in the process of switching data. The invention also discloses a data transmission method. It based on different circumstances chooses different switching data transmission method, reducing lost data during the process of network switching.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04Q7/30H04L1/18H04W28/04H04W36/02H04W36/30
Inventor 王宗杰薛希俊谢明江
Owner HUAWEI TECH CO LTD
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