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Method and LTE (long term evolution) system for across node B handover of user terminal

A user terminal and cross-base station technology, which is applied to the cross-base station handover method for user terminals and the field of LTE systems, can solve problems such as mismatch of re-establishment information and failure of re-establishment, so as to ensure no dropped calls, improve success rate, reduce The effect of call drop rate

Inactive Publication Date: 2011-07-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the target eNB did not receive MSG3, it considered that the re-establishment of the handover failed, and prepared the re-establishment information of the source cell, but did not prepare the re-establishment preparation information generated by the handover target cell information, so the re-establishment information did not match, resulting in Re-establishment failed, UE dropped calls

Method used

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  • Method and LTE (long term evolution) system for across node B handover of user terminal
  • Method and LTE (long term evolution) system for across node B handover of user terminal
  • Method and LTE (long term evolution) system for across node B handover of user terminal

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Embodiment 1

[0039] see figure 1 As shown, a handover method for improving the success rate of user terminal re-establishment, including steps:

[0040] Step 1-3: The source eNB receives the measurement report from the UE, or triggers a handover due to the load balancing function, and sends a handover request (Handover Request) message to the target eNB through the X2 port or the S1 port. The handover includes but is not limited to mobility-triggered switch. The Handover Request message includes, but is not limited to, the RRC context of the UE, UE capability, and re-establishment preparation information including handover source cell information.

[0041] Step 4-5: After receiving the handover request, the target eNB saves the UE-related context information and the re-establishment preparation information brought by the source eNB, allocates radio resources, cell wireless network temporary identifier CRNTI, dedicated preamble, etc., and then according to the cell of the target cell The ...

Embodiment 2

[0055] see figure 2 as shown, figure 2 Connection relationship diagram of UE, eNB, MME, and S-GW (Service Gate Way) for X2 handover. There is X2 interface coupling between the two eNBs. Before handover, UE and eNB1 have UU ports, that is, air interfaces. Afterwards, the UE disconnects the UU interface with eNB1, and establishes a UU interface with eNB2.

[0056] see image 3 As shown, the switching process is as follows:

[0057] Step 301: UE detects that the signal quality of a certain cell in eNB2 is higher than the signal quality of the serving cell by a certain threshold, and reports a measurement report of A3 event.

[0058] Steps 302-303: eNB1 determines that the UE needs to perform X2 handover to eNB2, and sends a handover request (Handover Request) message to eNB2, which includes but not limited to UE history information, UE wireless capability information, UE service information, and handover source cell information and the re-establishment preparation informati...

Embodiment 3

[0071] see Figure 4 as shown, Figure 4 Connection relationship diagram of UE, eNB, MME, and S-GW for S1 handover. There is no X2 interface coupling between the two eNBs. Before the handover, there is a UU interface between UE and eNB1, that is, the air interface. After handover, the UU interface between UE and eNB1 disconnect, and establish a UU interface with eNB2.

[0072] see Figure 5 As shown, the switching process is as follows:

[0073] Step 501: UE detects that the signal quality of a certain cell in eNB2 is higher than the signal quality of the serving cell by a certain threshold, and reports a measurement report of A3 event.

[0074] Steps 502-503: eNB1 determines that the UE needs to perform S1 handover to eNB2, and sends a Handover Required (Handover Required) message to the MME, which carries information elements such as Source to Target transparent container, and is based on the handover source cell information and the physical layer ID of the handover target ...

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Abstract

The invention discloses a method and LTE (long term evolution) system for across node B handover of a user terminal. The method comprises: after receiving a handover request from the user terminal, a target evolved node B (eNB) utilizes a target cell handover information to generate target cell reestablishment information and locally store the target cell reestablishment information; after receiving a reestablishment request from the user terminal, the target eNB judges whether the reason values in the reestablishment request are handover failures or not, if not, the target eNB matches the target cell reestablishment information with the user terminal; and then reestablishment succeeds. Compared with the prior art, the handover method and the LTE system have the following advantages: when the UE sends the reestablishment request to the target eNB and if the reason values in the reestablishment request are not handover failures, the target eNB matches the reestablishment ready information generated by target cell information with a UE (user equipment) entity, and then the reestablishment succeeds. By utilizing the method, the success rate of the establishment during the handover process is improved, thereby ensuring that the UE has no dropped call, and reducing the dropped call rate of the UE.

Description

technical field [0001] The invention belongs to the technical field of LTE (Long Term Evolution, long-term evolution) wireless communication, and specifically relates to a user terminal handover method across base stations and an LTE system. Background technique [0002] In the LTE system, the state of a user terminal (UE, User Equipment) is divided into two types: a connected state (RRC_CONNECTED) and an idle state (RRC_IDLE). When the UE in the RRC_CONNECTED state moves from the serving cell to another cell, a handover (Handover) will be triggered to ensure uninterrupted services. [0003] According to the scene where the UE resides in the base station, the handover is divided into handover within an eNB (Evolved NodeB, evolved Node B) and handover between eNBs. The intra-eNB handover means that the source cell and the target cell of the handover are located in the same eNB; the inter-eNB handover means that the source cell and the target cell of the handover are located ...

Claims

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Application Information

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IPC IPC(8): H04W36/08H04W74/08
CPCH04W36/0072
Inventor 彭聪郑伟
Owner ZTE CORP
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