COMMUNICATION SYSTEM AND METHOD THEREOF

• US 20090268640A1
• Filed: 02/20/2009
• Published: 10/29/2009
• Est. Priority Date: 04/28/2008
• Status: Abandoned Application

• Current Assignee: National Taiwan University (Government of The Republic of China), Quanta Computer
• Original Assignee: National Taiwan University (Government of The Republic of China), Quanta Computer
• Inventors: WU, Min-Jhe, TSAI, Zse-Hong, HSU, Chiu-Chan
• Application Number:
  US12/389,912
• Publication Number:
  US 20090268640A1
• Time in Patent Office: Days
• US Class Current: 370/262
• CPC Class Codes: H04M 3/42246 where the subscriber uses a multi-mode terminal which moves and accesses different networks with at least one network having a wireline access including cordless PBX
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14

Abstract

A communication method is provided. Firstly, whether the called-party side communication device is inside an area is judged. When the called-party side communication device is inside the area, the first communication link is established through a wireless local network for the caller side communication device to communicate with the called-party side communication device. When the called-party side communication device is outside the area, a second communication link is established through the mobile network communication for the caller side communication device to communicate with the called-party side communication device. When the caller side communication device communicates with the called-party side communication device and the location of the called-party side communication device is switched between being inside and being outside the area, the first communication link is switched to the second communication link or the second communication link is switched to the first communication link by way of multi-party call operation.

Claims

1. A communication system used for enabling a caller side communication device and a called-party side communication device to communicate with each other, wherein the called-party side communication device comprises a first communication module and a second communication module, the first communication module and the second communication module respectively support a wireless local network communication and a mobile network communication, the communication system comprises:

a virtual secretary system for judging whether the called-party side communication device is inside an area of a wireless local network and determining whether to establish a first communication link on the wireless local network for enabling the virtual secretary system and the first communication module to communicate with each other or to establish a second communication link on a mobile network for enabling the virtual secretary system and the second communication module to communicate with each other; and

a business telephone system for enabling the caller side communication device and the virtual secretary system to communicate with each other in response to a ringing event;

wherein, when the caller side communication device and the virtual secretary system communicate with each other, the virtual secretary system further establishes one of the first communication link and the second communication link for enabling the caller side communication device and the called-party side communication device to communicate with each other;

wherein, when the caller side communication device and the virtual secretary system communicate with each other and the location of the called-party side communication device is switched between being inside and being outside the area, the virtual secretary system, by way of multi-party call operation, switches the first communication link to the second communication link or switches the second communication link to the first communication link, such that the caller side communication device and the called-party side communication device keep communicating with each other.

2. The communication system according to claim 1, wherein when the called-party side communication device is inside the area, the virtual secretary system establishes the first communication link on the wireless local network for enabling the virtual secretary system and the first communication module to communicate with each other, such that a three-party call operation is formed among the first communication module, the virtual secretary system and the business telephone system, and the called-party side communication device and the caller side communication device communicate with each other through the three-party call operation.

3. The communication system according to claim 2, wherein after the first communication link is established, when a signal intensity of the wireless local network, on which the called-party side communication device operates communication, is lower than a threshold value, the virtual secretary system establishes the second communication link on the mobile network for enabling the virtual secretary system and the second communication module to communicate with each other, such that a four-party call operation is formed among the first communication module, the second communication module, the virtual secretary system and the business telephone system, and the called-party side communication device and the caller side communication device communicate through the four-party call operation.

4. The communication system according to claim 3, wherein after the first communication link and the second communication link are established, the virtual secretary system terminates the first communication link if the signal intensity continues to be lower than the threshold value.

5. The communication system according to claim 1, wherein when the called-party side communication device is outside the area, the virtual secretary system establishes the second communication link on the mobile network for enabling the virtual secretary system and the second communication module to communicate with each other, such that a three-party call operation is formed among the second communication module, the virtual secretary system and the business telephone system, and the called-party side communication device and the caller side communication device communicate by way of the three-party call operation.

6. The communication system according to claim 5, wherein after the second communication link is established, when the called-party side communication device is inside an area of the wireless local network, the virtual secretary system establishes the first communication link on the wireless local network for enabling the virtual secretary system and the called-party side communication device to communicate with each other, such that a four-party call operation is formed among the first, the second communication module, the virtual secretary system and the business telephone system, and the called-party side communication device and the caller side communication device communicate by way of the four-party call operation.

7. The communication system according to claim 6, wherein after the first communication link and the second communication link are established, the virtual secretary system further terminates the second communication link if a signal intensity of the wireless local network continues to be higher than a threshold value.

8. A communication method, comprising:

(a) judging whether a called-party side communication device is inside an area of a wireless local network in response to a ringing event activated by a caller side communication device;

(b) establishing a first communication link through a wireless local network when the called-party side communication device is inside the area for enabling the caller side communication device and the called-party side communication device to communicate with each other;

(c) establishing a second communication link through a mobile network communication when the called-party side communication device is outside the area for enabling the caller side communication device and the called-party side communication device to communicate with each other; and

(d) switching the first communication link to the second communication link or switching the second communication link to the first communication link by way of a multi-party call operation when the caller side communication device and the called-party side communication device communicate with each other and the location of the called-party side communication device is switched between being inside and being outside the area, such that the caller side communication device and the called-party side communication device keep communicating with each other.

9. The communication method according to claim 8, wherein step (b) comprises:

(b1) establishing the first communication link for enabling the caller side communication device and the called-party side communication device to communicate with each other;

(b2) judging whether the called-party side communication device is inside the area of the wireless local network; and

(b3) executing the step (c) at the same time if the called-party side communication device is outside the area.

10. The communication method according to claim 9, wherein after the step (b3), the method comprises:

(b4) terminating the first communication link if the signal intensity continues to be lower than a threshold value.

11. The communication method according to claim 8, wherein step (c) comprises:

(c1) establishing the second communication link for enabling the caller side communication device and the called-party side communication device to communicate with each other;

(c2) judging whether the called-party side communication device is inside the area of the wireless local network and

(c3) executing the step (b) at the same time if the called-party side communication device is inside the area.

12. The communication method according to claim 11, wherein after step (c3), the method comprises:

(c4) terminating the second communication link if an intensity of the signal continues to be higher than a threshold value.