Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode

A voice call, access mode technology, applied in access restriction, electrical components, connection management, etc., can solve the problems of increasing the air interface signaling burden, increasing the core network communication burden, etc., and reduce signaling interaction and call flow. Simplify, reduce the effect of interaction

Active Publication Date: 2011-10-05
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Regardless of whether the network supports it or not, and what the wireless environment the terminal is in, the RRC establishment process, authentication and integrity protection process, measurement control process, and handover process need to be performed between the terminal and the network. ) must send an Extend Service Request message, basically start all the functional modules of LTE and GERAN / UTRAN, and use SRVCC to carry out LTE EPC and GERAN / UTRAN coordination to complete, which increases the signaling burden of the air interface, It also increases the communication burden between the various physical interfaces of the core network

Method used

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  • Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode
  • Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode
  • Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode

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specific Embodiment 1

[0037] The application scenario of this embodiment is as attached image 3 As shown, the terminal in this embodiment is a TD-SCDMA and LTE dual-mode terminal. There is one LTE cell and three TD-SCDMA cells in the area where the terminal is located, and the three TD-SCDMA cells are all adjacent cells of the LTE.

[0038] The overall process of this embodiment is attached figure 2 shown.

[0039] 1. After the terminal is turned on, it chooses to reside in an LTE cell, and performs the normal attachment process or tracking area update process. The terminal finally enters the normal idle mode. During this process, the terminal has interpreted the LTE system message, and from In LTE system information 7 (abbreviation: SIB7), the network obtains the information of adjacent cells TD-SCDMA cell1, TD-SCDMA cell2, and TD-SCDMA cell3.

[0040] 2. The application layer of the terminal initiates a voice call request in the circuit domain to the call control module (abbreviation: CC mod...

specific Embodiment 2

[0052] The application scenario of this embodiment is as attached Figure 4 As shown, the terminal in this embodiment is a GSM and LTE dual-mode terminal. There is one LTE cell, LTE cell, and three GSM cells, GSM cell1, GSM cell2, and GSM cell3, in the area where the terminal is located, and the three GSM cells are all adjacent cells of the LTE.

[0053] The overall process of this embodiment is attached figure 2 shown.

[0054] 1. After the terminal is powered on, it chooses to reside in an LTE cell, and performs the normal attach process or tracking area update process. The terminal finally enters the normal idle mode. During this process, the terminal has interpreted the LTE system The system information 7 (abbreviation: SIB7) in the network obtains the information of the neighboring cells GSM cell1, GSM cell2, and GSM cell3.

[0055] 2. The application layer of the terminal initiates a voice call request in the circuit domain to the call control module (abbreviation: C...

specific Embodiment 3

[0069] The application scenario of this embodiment is as attached Figure 4 As shown, the overall process is as attached figure 2 shown.

[0070] Steps 1~4 are identical with specific embodiment 2;

[0071] 5. The RRC module selects an available GSM cell from the list of adjacent cells as the reselection target cell, forces cell reselection, and reports the reselection result to the non-access stratum;

[0072] Wherein, the available means that the cell is not prohibited by the network;

[0073] 501. The RRC module obtains the information of the current GSM neighboring cells GSM cell1, GSM cell2, and GSMcell3 from the neighboring cell list;

[0074] 502. The RRC module judges whether these GSM neighboring cells have been measured according to the cell information, if it is to perform step 504, otherwise perform step 503;

[0075] 503. The terminal measures all GSM cells in the adjacent cell list;

[0076] 504. According to the cell measurement result, the RRC module sele...

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Abstract

The invention provides a method for initiating a circuit switch (CS) domain voice call by an LTE (long term evolution) multimode terminal under an LTE access mode, and the method comprises: the terminal forcibly initiates cell reselection onto a GERAN (GSM EDGE radio access network) or UTRAN (UMTS terrestrial radio access network) cell when initiating the CS domain voice call; the terminal initiates a location area upgrading process on the reselected cell; and the terminal initiates a normal CS domain voice call building process on the reselected cell. In the technical scheme, the cell reselection is forcibly carried out when the terminal initiates the CS domain voice call, and the normal CS domain voice call building process is initiated when being reselected onto the GERAN or UTRAN cell, so that the whole calling flow is simplified, the signaling interaction between the terminal and a network is reduced, only one location area upgrading process is between the terminal and the network even if an ISR (interrupt service routine) is not supported when the terminal is in the registering process of an LTE access technology mode, the interaction of core networks of the LTE and the GERAN / UTRAN is also decreased.

Description

technical field [0001] The present invention relates to the voice technology in the mobile communication long-term evolution system (referred to as: LTE). In particular, it relates to a method for an LTE multi-mode terminal to initiate a circuit domain (referred to as: CS domain) voice call in an LTE access mode. Background technique [0002] The LTE mobile communication system is a full Internet Protocol (abbreviation: IP) communication system and an enhanced packet system (abbreviation: EPS), so the core network of the LTE system no longer supports CS domain voice services. However, in the early stage of EPS network construction, if the operator already has a mature global digital mobile communication network or a general terrestrial radio access network (abbreviation: GERAN / UTRAN) For the deployment strategy of the protection and packet core network (abbreviation: EPC), operators can use the original CS domain voice solution to provide voice services. (abbreviation: CS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/20H04W76/02
Inventor 段红光罗一静申敏郑建宏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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