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Method and system for realizing voice switching in single wireless access way

A technology for an access method and an implementation method, applied in the field of communications, can solve problems such as increased interruption time, poor wireless access conditions, and inability to notify users of handover, etc., to reduce interruption time and optimize the media negotiation process.

Inactive Publication Date: 2010-09-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when some of the following situations occur, the interruption time caused by network switching will increase, even exceeding 300ms
[0072] 1) When the user is in the roaming state, or calls other network users, or makes international long-distance calls, the number of call links increases;
[0073] 2) When the network system is relatively busy, the processing capacity decreases;
[0074] 3) When the processing capability of UE-B is relatively poor, or the wireless access condition is not good, or the bandwidth is limited;
[0076] In addition, the entire switching process is relatively long. From step 402 to decide to switch to step 418 to notify the user of switching, there are many steps and links in the whole process, especially when it involves remote user media updates. In special cases, it will take longer
When the user is moving at high speed, or there is a sudden attenuation of the wireless signal, the user may have moved out of the coverage area of ​​the source wireless access when step 418 is executed to notify the user, resulting in failure to notify the user of the handover and handover failure

Method used

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  • Method and system for realizing voice switching in single wireless access way
  • Method and system for realizing voice switching in single wireless access way
  • Method and system for realizing voice switching in single wireless access way

Examples

Experimental program
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no. 1 example

[0118] Figure 5 It is a flow chart of single radio access voice handover in the first embodiment of the present invention, describing the process of UE-A accessing in the source radio access coverage area, establishing an IMS session with remote UE-B, and then handing over to the CS network . This embodiment has nothing to do with non-voice media, and only considers the handover process from the source wireless access network to the target CS network. Its steps are described as follows:

[0119] Steps 501-508 and Figure 4 Steps 401-408 in are the same.

[0120] 509. The IWG uses the handover identifier STN as the called number, uses an Initial Address Message (InitialAddress Message, IAM for short) message to send a handover request to the IMS, and requests the SCC AS to perform the handover process;

[0121] This step can be performed after step 507 and in parallel with step 508 .

[0122] 510. The MGCF converts the IAM into a SIP invitation message (INVITE), and sends...

no. 2 example

[0164] Figure 6 It is a schematic diagram of the handover process in the single radio access mode according to the second embodiment of the present invention. Describes the process that UE-A accesses in the source wireless access coverage area, establishes an IMS session with remote UE-B, and then switches to the CS network. The process includes the following steps:

[0165] 601. When the UE accesses the IMS from the source wireless network and enters the call state, the UE regularly detects the surrounding wireless environment, and notifies the source wireless access network through a measurement report;

[0166]602. The source wireless access network checks the current wireless communication conditions according to the local configuration. If it is found that the currently used wireless access is no longer suitable for communication, for example, the signal strength is lower than the set threshold, the surrounding wireless access reported from the UE Network information to...

no. 3 example

[0190] The pre-switching mechanism can also be used simultaneously with the method for reducing the interruption time of downlink media stream switching mentioned in the first embodiment. In this embodiment, only the scene with voice media is described. Such as Figure 7 As shown, the switching process includes the following steps:

[0191] Steps 701-708 and Figure 4 Steps 501-508 in are the same.

[0192] 709. The IWG uses the handover identifier STN as the called number, uses an Initial Address Message (InitialAddress Message, IAM for short) message to send a handover request to the IMS, and requests the SCC AS to execute the handover process;

[0193] This step can be performed after step 707 and in parallel with step 708 .

[0194] 717a. The IWG sends a pre-handover command message to the source wireless access network, carrying the handover information acquired in step 707;

[0195] The label of this step does not indicate the execution sequence, but is only for con...

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Abstract

The invention provides a method for realizing voice business switching in a single wireless access way. When a source wireless access network decides to switch an on-going voice business carried out by a single wireless access terminal into a target circuit domain network, the method comprises the following steps that the source wireless access network transmits a circuit domain switching request to an interworking gateway (IWG); the IWG and the target circuit domain network finish the circuit domain switching preparation process; when branch switching is accessed, the IWG transmits preswitching indication information and switching information to the single wireless access terminal by the source wireless access network; and the single wireless access terminal stores the switching information, enters a preswitching state according to the preswitching indication information, waits for a switching command and finishes the following switching processes. The realizing method and system can ensure that the successful switching of the voice business is realized.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for realizing voice switching in a single wireless access mode. Background technique [0002] In 2 Generation (2G for short), 3G (3 Generation, 3G for short) mobile communication networks, such as Global System for Mobile Communications (GSM for short), Universal Mobile Telecommunications System (Universal MobileTelecommunications System for short), For UMTS), a circuit switching (Circuit Switch, CS for short) mode is adopted to provide voice services, and good coverage has been formed. With the development of wireless broadband technology and the development of Internet Protocol (IP) technology, the entire network is evolving towards all-IP. On the one hand, the core network of the communication network is moving towards the IP Multimedia Core Network Subsystem, On the other hand, the wireless access network is developing towards packet switching, which carries voi...

Claims

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Application Information

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IPC IPC(8): H04W36/14H04W36/18
CPCH04W36/0022H04W36/00226
Inventor 郝振武游世林谢振华陶全军谢宝国
Owner ZTE CORP
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