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Switching method between evolved wireless system and traditional wireless system

A wireless system and traditional technology, applied in transmission systems, wireless communications, digital transmission systems, etc., can solve problems such as lack of implementation solutions, and achieve the effect of small data loss and reduced handover delay

Inactive Publication Date: 2007-12-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The GERAN (GSM / EDGE radio access network) of UTRAN and Iu mode all supports backward handover, therefore, the handover between the GERAN of UTRAN or Iu mode and LTE can adopt method described in the present invention, but also does not have a feasible realization at present Program

Method used

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  • Switching method between evolved wireless system and traditional wireless system
  • Switching method between evolved wireless system and traditional wireless system
  • Switching method between evolved wireless system and traditional wireless system

Examples

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no. 1 example

[0066] This embodiment is the case when the UE switches from LTE to Pre-LTE. The key steps of switching are shown in Figure 4. The data paths before and after switching are shown in Figure 6A and Figure 6B, respectively. The flow chart of the implementation is shown in Figure 7. For simplicity, the user plane nodes are integrated into one node AGW in Figure 7, but this embodiment is still applicable when the user plane units are divided into different entities according to logical functions. in:

[0067] The handover from LTE to Pre-LTE has the following key steps, as shown in Figure 4:

[0068] Step 1, LTE sends a "handover request" to the MME;

[0069] Step 2, the MME sends a "forward relocation request" message to the SGSN;

[0070] Step 3. The SGSN notifies the RAN side (ie Pre-LTE) that supports subsequent handovers to allocate radio resources for the UE, and the SGSN establishes an Iu connection with the RAN side according to the SRNS relocation process in TS23.090; ...

no. 2 example

[0106] This embodiment is the situation when the UE switches from Pre-LTE to LTE. The key steps of switching are shown in Figure 5. The data paths before and after switching are shown in Fig. 8A and Fig. 8B respectively. The flow chart of the implementation is shown in Figure 9. For simplicity, the user plane nodes are integrated into one node AGW in Figure 9, but this embodiment is still applicable when the user plane units are divided into different entities according to logical functions. in:

[0107] The handover from Pre-LTE to LTE has the following key steps, as shown in Figure 5:

[0108] Step 1, Pre-LTE sends "relocation request" to SGSN;

[0109] Step 2, the SGSN sends a "forward relocation request" message to the MME;

[0110] Step 3: MME sends a handover request to AGW, establishes S1 user plane bearer between AGW and LTE and allocates a wireless channel for UE, and AGW sends downlink data to SGSN and eNB at the same time;

[0111] Step 4, MME sends a "Forward ...

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Abstract

A switching method between LTE and Pre-LTE in mobile communication system, during switching between LTE and Pre-LTE, the LTE system is regarded as a Pre-LTE system, the course of switching makes SGSN regards switching as a SRNS relocation course. When the LTE is switched to Pre-LTE, the function of SGSN is similar with new-SGSN of SGSN in course of relocation; MME possesses function of old-SGSN; when the Pre-LTE is switched to LTE, the function of SGSN is similar with old-SGSN of SGSN in course of relocation, the MME possesses function of new-SGSN. The MME can transform new and old system command and information; it possesses function of command gateway. The switching method between LTE and Pre-LTE in the invention does not need to update current system, delay of switching is little, and data loss can be decreased to the minimum.

Description

technical field [0001] The invention relates to a switching method from an evolved wireless system LTE to a traditional wireless system Pre-LTE in a mobile communication system. Background technique [0002] The architecture of the SAE (System Architecture Evolution, system evolution architecture) system is shown in Figure 1. The core network includes the SAE EPC (Evolved Packet Core) and the SGSN in the GPRS core network; the access system to which the SAE EPC is connected is the Evolved RAN (Radio Access Network), also known as LTE, the access system to which the SGSN is connected is UTRAN / GERAN, commonly known as Pre-LTE. LET broadly represents a long-term evolution technology, which is used as an "evolved wireless system" in this paper, and Pre-LTE is used as a "traditional wireless system". [0003] The definition of each network element in the figure is as follows: [0004] SGSN (Serving GPRS supporting node, GPRS serving node): 2G / 3G network packet domain functional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B7/26H04L12/24H04L12/56H04L12/58H04W36/02H04L45/50H04W36/14
Inventor 宗在峰朱进国吴瑟
Owner ZTE CORP
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