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Switching method and system for achieving circuit switching (CS)
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A technology for circuit switching and handover preparation, which is applied in the field of communication, and can solve problems such as long handover preparation time, poor terminal signal, and call drop, and achieve the effects of shortening handover preparation time, reducing handover delay, and reducing call drop
Inactive Publication Date: 2010-11-24
HUAWEI TECH CO LTD
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[0014] In the process of realizing the present invention, the inventors found that in the prior art, a long handover preparation time is required, and the handover efficiency is low
Moreover, in some scenarios, the long-term handover preparation may affect the normal transmission of data. For example, in areas with deep signalfading (corner, high speed, etc.), the 3G networksignal may rapidly fade, and the handover preparation from 3G to 2G The time is relatively long, so it may cause the terminal to drop the call due to poor signal before switching to the 2G network (even before the switching preparation is completed).
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specific Embodiment approach 1
[0063] Specific implementation mode one, see image 3 , in this example, a certain terminal needs to be handed over from a 3G TD-SCDMA network to a certain cell under a 2G GSM network, the source controller is an RNC, and the target controller is a BSC. The method includes the following steps :
[0064] S301: When the RNC decides (for example, according to the measurement report reported by the terminal) that the call of a certain terminal needs to be handed over from the TD-SCDMA cell to the GSMcell, send an enhanced handover request message (such as ENHANCED RELOCATION REQUEST) through the interconnection interface between the controllers to the BSC; and wait for a response from the BSC.
[0065] The enhanced handover request message may include but not limited to source cell identifier (such as CGI, RNC-ID and Cell ID, etc.), target cell identifier (such as CGI, RNC-ID and Cell ID, etc.), source controller identifier ( Such as RNC-ID, etc.), target controller identifier,...
specific Embodiment approach 2
[0118] Specific implementation mode two, see Figure 11 , in this example, a certain terminal needs to be handed over from a 2G GSM network to a certain cell under a 3G TD-SCDMA network, the source controller is a BSC, and the target controller is an RNC. The method includes the following steps :
[0119] S1101: When the BSC judges that the call of a certain terminal needs to be handed over from GSM to TD-SCDMA, it sends an enhanced handover request message ENHANCED RELOCATION REQUEST to the RNC through the inter-controller interconnection interface, and waits for a response from the RNC;
[0120] The enhanced handover request message may include source cell identification (such as CGI, RNC-ID and CellID, etc.), target cell identification (such as CGI, RNC-ID and Cell ID, etc.), source controller identification (such as BSC-ID , CIC, etc.), target controller identification (such as RNC-ID, etc.), current call identification, current terminal identification (such as IMSI, TMSI...
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Abstract
The invention discloses a switching method for achieving circuit switching (CS), which comprises the following steps: a source controller initiates a switching preparation process to a target controller through an interconnection port between the controllers; the answer message of the target controller after resource reservation is finished is received; and the source controller transmits a switching command to a terminal according to the answer message of the target controller. By adopting the invention, switching timedelay can be reduced, and the probability of phenomena such as call dropping and the like caused by too long switching preparation time can be reduced. Meanwhile, data transmission links are rebuilt, therefore, the normal transmission of a signaling and data after switching can be ensured.
Description
technical field [0001] The invention relates to the communication field, in particular to a method and a system for realizing circuit switching CS handover. Background technique [0002] Circuit Switching (CS) refers to the process of establishing connections on demand and allowing dedicated connections until they are released. A circuit-switched network consists of one physical path and supports a single connection between two endpoints in the network connection. When transmitting real-time data (such as audio and video, etc.) or when the quality of service (QOS) requirements are high, circuit switching networks are usually used. For example, a traditional voice telephone service is a process of realizing circuit switching through a public switched telephone network (Public Switch Telephone Network, PSTN). [0003] In a mobile communication system, voice is usually carried by circuit switching. The mobile communication system currently includes GSM system, UMTS system, L...
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