Patent Application
20070280252
The invention will become more fully understood from the detailed description given herein below for illustration only, and thus is not limitative of the present invention, wherein:
The purpose, construction, features, and functions of the invention can be appreciated and understood more thoroughly through the following detailed description with reference to the attached drawings.
Firstly, refer to
When the DECT 90 is registered with a first base station 60, a session initiation protocol registration message is transmitted from a first base station 60 to a first mobile agent 30, which is used to transmit a SIP registration message to a SIP proxy 10. As such, the DECT 90 completes its SIP registration with the SIP proxy 10, and proceeds with the address linking with other DECT according to the registration information, hereby realizing voice communication.
When the DECT 90 is on-line, the calling signals or the RTP data packets are transmitted by the DECT 90 to a first mobile agent 30 through a first base station 60, and are processed by the first mobile agent 30, and then are transmitted to the SIP proxy 10 through the network phone gateway 20 for subsequent transmission to other DECT, requiring communication. For the SIP proxy 10, all the signals emitted by the DECT 90 are processed by the first mobile agent 30.
In case DECT 90 is making intra-domain roaming and is registered with the second base station 70, since at this time, the second base station 70 is still connected with the first mobile agent 30, the first mobile agent 30 is well aware of the position of the DECT 90, so the first mobile agent 30 redirects the calling signals or the RTP data packets directly, coming from the DECT 90. Subsequently, the calling signals or the RTP data packets are processed by the first mobile agent 30, then the processed calling signals or the RTP data packets are transmitted to the SIP proxy 10 through the network phone gateway 20.
In case DECT 90 is making inter-domain roamings, and is switching its registration to a third base station 80 of a second mobile agent 40, at this time a tunnel 50 is established from the first mobile agent 30 to the second mobile agent 40 by means of a communication mechanism. Then the calling signals or the RTP data packets are transmitted from the DECT 90 to the second mobile agent 40 through the third base station 80. The received calling signals or the RTP data packets are then transmitted from the second mobile agent 40 to the first mobile agent 30 through the tunnel 50. The calling signals or the RTP data packets thus received are processed by the first mobile agent 30, and then are transmitted to the SIP proxy 10 through the network phone gateway 20. When the communication of the DECT 90 terminates, then the tunnel 50 is disconnected.
Though the above-mentioned description, it is evident that, for both the intra-domain and the inter-domain roamings of the DECT 90, the signals emitted are all transmitted through the first mobile agent 30, thus realizing the seamless handoff between intradomain and interdomain, and roamings in intradomain and interdomain of the DECT 90.
Next, refer to
As shown in
Firstly, the step of registering DECT 90 to a SIP proxy 10 (step S200) has the following steps (as shown in
When the DECT 90 is on-line engaging in communication, the calling signals or the RTP data packets are transmitted from DECT 90 to the first mobile agent 30 through the first base station 60 (step S210), and are processed by the first mobile agent 30, and then are transmitted to the SIP proxy 10 through the network phone gateway 20 for subsequent transmission to other DECT requiring communication (step S220). For the SIP proxy 10, all the signals emitted by the DECT 90 are processed by the first mobile agent 30.
In case DECT 90 is making intra-domain roaming and is switching its registration to the second base station 70 of the first mobile station 30, the calling signals or the RTP data packets emitted by the DECT 90 are transmitted to the first mobile station 30 through the second base station 70, which is well aware of the present position of the DECT 90. As such, the first mobile agent 30 redirects directly the calling signals or the RTP data packets coming from the DECT 90. Subsequently, the calling signals or the RTP data packets are processed by the first mobile agent 30, and are transmitted to the SIP proxy 10 through the network phone gateway 20 (step S230).
In case DECT 90 is making inter-domain roaming, and is switching its registration to a third base station 80 of the second mobile agent 40, a tunnel 50 is established from the first mobile agent 30 to the second mobile agent 40 by means of a communication mechanism. The calling signals or the RTP data packets are transmitted from the DECT 90 to the second mobile agent 40 through a third base station 80. The received calling signals or the RTP data packets are transmitted from the second mobile agent 40 to the first mobile agent 30 through the tunnel 50. The calling signals or the RTP data packets thus received are processed by the first mobile agent 30, and then are transmitted to the SIP proxy 10 through a network phone gateway 20. When the communication of DECT 90 terminates, the tunnel 50 is disconnected (step 240).
Through the application of the above-mentioned system and the method of the invention, the DECT 90 may communicate with other DECT 90 through the network, hereby realizing the VOIP. For the DECT 90 roaming in an intra-domain or inter-domain manner, the signals emitted are all processed by a first mobile agent 30, thus realizing the seamless handoff between intradomain and interdomain, and roamings in intradomain and interdomain.
Knowing the invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
