KR100570898B1 - Packet based indoor cellular system and handover method thereof - Google Patents

Abstract

The present invention implements a premises call between mobile telephones using a packet-based network, and is a new concept packet-based mobile telephone premises switched network system that can be interworked with an existing mobile communication network and a data communication network. The present invention relates to a call processing method, comprising: a call server (110) for performing overall call processing control; An internet protocol based base station 120 performing a wireless channel interface function between a packet based network and a mobile telephone under the control of the call server 110; A gateway 130 supporting interworking of the packet-based network and an external mobile communication network 200; And a router 140 for interconnecting the packet-based network with another data communication network 300, wherein the method of the present invention sets the duration of staying in the handoff area when the mobile phone is in the premises handoff area. If it exceeds the predetermined time, and if the predetermined time is exceeded, select a channel with a relatively high power level and disconnect other channels, but the mobile phone leaves the handoff area and enters the corresponding service area of the disconnected channel. In this case, the disconnected channel is recovered before disconnection of the selected channel, thereby dispersing channel demand and improving efficiency of channel use.

Mobile Networks, Data Networks, Packet-Based Networks, Mobile Phones, Handoffs

Description

Packet-based mobile telephone exchange equipment and call processing method using the same {Packet based indoor cellular system and handover method             

1 is a block diagram of a packet-based mobile telephone switched office according to an embodiment of the present invention;

2 is a flowchart illustrating a call processing method in a packet-based mobile telephone exchange in accordance with an embodiment of the present invention;

3 is a flowchart illustrating an example of a call processing method according to the present invention when a handover call is generated in a premises;

4 is a flowchart illustrating an example of a call processing method according to the present invention when a handover call is generated from the outside.

※ Explanation of code for main part of drawing

   100: packet based network 110: call server

   120: IP based base station 130: gateway

   140: router 200: external mobile communication network

   210: base station 300: data communication network

The present invention relates to a packet-based mobile telephone premises exchange apparatus and a call processing method using the same, and more particularly, to implement premises calls between mobile telephones using a packet-based network, The present invention relates to a packet-based mobile switching center of a new concept and to a call processing method using the same.

As the volume of communication is gradually increased, and the call of data is increased more than voice, the packet switching method for data communication is in the spotlight. As a result, the circuit switching method for voice communication and the packet switching method for communication are rapidly increasing. In this trend, the integration of wired and wireless telephony has become an inevitable path in the field of communication technology.

In addition, when the existing mobile communication network is applied indoors, the mobile phone user's movement rate is significantly smaller or relatively slower than the outdoor environment due to the characteristics of the general indoor environment. Owing to occupying one channel at a time for a long time unnecessarily increases the channel occupancy.

The present invention was created to be applicable to the integration of various communication methods according to the times as described above, the purpose of which is to implement the voice and data communication between mobile phones using a packet-based network, The present invention is to provide a packet-based mobile telephone exchange switching device and a call processing method using the same that can be interworked with a mobile communication network and a data communication network.

It is another object of the present invention to provide a packet-based mobile telephone premises switching device and a call processing method using the same to increase the channel utilization by using only one channel when the mobile phone stays in the handoff region continuously. will be.

Another object of the present invention is to provide a packet-based mobile switching premises switching device that can be used in conjunction with the premises network according to the availability of the channel of the external mobile communication network when there is no idle channel in the premises base station and the same It is to provide a call processing method used.

In order to achieve the above object, the packet-based mobile telephone premises switching network according to the present invention, in a local mobile communication network for mutual call connection processing between mobile phones, establishes and releases calls with mobile phones in the local mobile communication network. And a call server performing overall call processing control including location registration. A plurality of network terminators connected to the call server via a packet-based network, each performing a radio channel interface function between the packet-based network and a mobile telephone under the control of the call server; A network interworking apparatus supporting interworking of the packet-based network and a global mobile communication network; And communication network connection means for interconnecting the packet-based network with another data communication network, wherein voice data exchange between the plurality of network terminators is performed by a packet method through the packet-based network.

In order to achieve the above object, a call processing method in a packet-based mobile telephone premises switching network according to the present invention includes a call server for call processing control and a packet-based network between a premises packet-based network and a mobile telephone under control of the call server. A method for processing mutual call connection between mobile telephones, comprising a plurality of network terminators performing a wireless channel interface function and a network interworking apparatus supporting interworking of the packet-based network and the global mobile communication network. A first step of converting a call originating radio signal received from a mobile telephone into a call originating packet signal including a corresponding address through an originating network terminator; Receiving the converted call originating packet signal at the call server to confirm whether the incoming mobile telephone is registered with a location, and transmitting the call originating packet signal to the destination network terminating device at the identified location; A third step of converting the transmitted call originating packet signal into a radio signal through the terminating network termination device and transmitting the radio signal to the terminating mobile telephone; A fourth step of converting a call incoming radio signal of the called mobile phone into a call incoming packet signal including a corresponding address through the called network terminating device and transmitting it to the calling network terminating device; And the originating network terminating device and the terminating network terminating device, which recognize each other's address based on call processing control of the call server, by using the address in the form of a packet for voice data between the incoming and outgoing mobile telephones. And a fifth step of exchanging; and in the second step, when the location of the called mobile phone is not registered, transmitting the call originating packet signal to the global mobile communication network through the network interworking device. The packet-based network and the mobile communication network are interoperable.

In addition, the call processing method in the mobile telephone premises switching network according to the present invention determines whether the mobile phone is in the hand-off area, calculates the duration of stay in the handoff area, and calculates After confirming that the predetermined time exceeds the predetermined time, if it is determined that the duration exceeds the predetermined time, a channel having a relatively high signal strength is selected and other channels are disconnected. When leaving the handoff area and entering the corresponding service area of the disconnected channel base station, the disconnected channel is recovered before disconnection of the selected channel. Further, in this process, if it is determined that the mobile phone is in the handoff area of the overlapped service area of the local switching network and the global mobile communication network, the network termination device and the global mobile communication network of the local switching network to be handed off. After checking each channel occupancy of the channel, the channel utilization of the network having a relatively low channel occupancy is increased.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the packet-based mobile phone switched network system and the call processing method using the same according to an embodiment of the present invention.

1 is a block diagram of a packet-based mobile switched premises switched network system according to an embodiment of the present invention, which performs overall call processing control including call setup, release, and location registration with a mobile telephone in a premises packet-based network. Call Server 110 as a device; Is connected to the call server 110 via the packet-based network (for example, Internet protocol-based premises wired network, such as http and TCP / ip), under the control of the call server 110 under the packet-based network An Internet Protocol based BTS (IP based BTS) 120 as a network terminator for performing a wireless channel interface function with a mobile telephone; A gateway 130 that supports interworking between the packet-based network and an external global land mobile network 200; The packet-based network and another data communication network (for example, the Internet) are configured as a router (Router) 140 as a communication network connector for interconnecting (Public Internet Network) (300).

FIG. 2 is a flowchart illustrating a call processing method in a packet-based switched mobile telephone network according to an embodiment of the present invention. Since the present invention is applied to a network system as shown in FIG. 1, it will be described in parallel with the operation description of the system. .

First, when the originating mobile phone O_MS attempts to make a call, an origination message is transmitted to the IP-based base station 120 (S1). The originating base station 121 receiving the outgoing message transmits information used in a code division multiple access (CDMA) network such as the number of the mobile telephone requesting the call and the number of the mobile telephone to be called, and at the same time the outgoing mobile telephone. The IP address of the originating base station 121 to be assigned to the channel to be allocated is transmitted to the call server (C / S) 110 (S2). The call server 110 is to page all the IP-based base station 120 connected to the call server 110 in the premises to find the incoming mobile phone, or check the location registration of the incoming mobile phone, Paging to the destination IP-based base station 122 having the address of the identified location (S3). The traffic channel is assigned between the originating mobile telephone and the originating base station 121, and the work is performed to maintain the channel (S4). The base station 122 sends a paging message to the incoming mobile telephone (T_MS). At this time, it includes the IP address sent from the originating base station 121 (S5). The called mobile phone responds to the paging message with a page response message (S6). The terminating base station 122 transmits the page response signal to the call server 110 including the corresponding IP address to be assigned to the channel to be called with the terminating mobile telephone (S7). The call server 110 sends an IP address sent from the destination base station 122 together while instructing call processing to the originating base station 121 (S8). The calling base station 121 gives a ring back tone to the calling mobile telephone (S9). The terminating base station 122 sends an alert message to the terminating mobile phone to instruct the ring to ring (S10). The call server 110 updates the call information of the incoming / outgoing mobile telephone period to a database (DB) and informs that the other mobile telephone is busy when the mobile telephone attempts to speak with the mobile telephone (S11). Since the originating base station 121 and the terminating base station 122 have mutual IP address information, a packet call according to the Internet protocol is performed between the two (S12). Accordingly, a call is made between the calling base station 121 and the calling mobile phone, and the called base station 122 and the called mobile phone according to a wireless channel interface standard (S13). When the call is completed, the calling mobile phone or the called mobile phone sends a release order to the corresponding base station 121 or 122 (S14). The base station receiving the call termination command transmits a call completion signal (Release Complete) to the call server 110 (GateKeeper role) according to a packet-based protocol (S15). The call server 110 transmits a call termination signal to the base station to which the call termination signal is sent and a counterpart base station in a call (S16). The base station receiving the call termination signal sends a termination order to the corresponding mobile phone (S17). Finally, the call completion information is updated in the database of the call server 110 (S18).

3 is a flowchart illustrating an example of a call processing method when the mobile telephone is in the premises handoff area, i.e., when a handover call is generated from the premises base station.

First, a case in which a handover call is generated in the premises will be described with reference to FIG. 1 as an example. After receiving and analyzing at 110, if the signal strength of the neighboring base station 122 is greater than or equal to a predetermined value T_ADD, it is determined that a handover call has been generated, which means that the mobile phone provides a service between the two base stations 121 and 122. The call processing method in the call server 110 will be described as follows.

When a handover call is generated (S21), it is determined whether there is a channel available in the base station 122 where the handover call is generated (S22), and when it is determined that there is an available channel, a channel is allocated to the handover call (S23). ).

After the channel assignment, after measuring the duration that the mobile phone stays in the handoff area, it is determined whether the duration exceeds a preset time limit (S24). Select the strong channel and disconnect the other channel (S25).

After the channel disconnection, when the mobile phone enters the corresponding service area of the disconnected channel base station, the channel of the disconnected channel base station is allocated just before the selected channel signal is disconnected to have a strength equal to or less than a predetermined value T_DROP. After the channel recovery is performed, it is determined whether to recover the disconnected channel based on the strength of the selected channel signal (S26). If it is determined that the channel should be restored, the channel is recovered and then started again from the step S4 (S27). , Or exit as is.

On the other hand, if it is determined that there is no channel available in step S22, the generated handover call is placed in a queue (S28), and continuously checking whether the channel is available for a preset time limit, and does not exceed the time limit. If it is determined that the channel quality is available under good conditions, the process starts from the above step S23 (S29, S30), and if it is not available, analyzes whether the call connection with the external mobile communication network 200 is possible (S31). If it is determined that it is not, the handover call is forcibly disconnected and terminated (S32). If it is determined that the call is accessible, the call server 110 of the mobile communication network 200 is connected to the gateway 130. The call connection with the base station 210 is performed (S33), so that the channel of the base station 210 of the mobile communication network 200 is allocated (S34), and the corresponding call information is updated (S35). It should end.

4 is a flowchart illustrating an example of a call processing method when a handover call is generated from the outside according to the present invention. When a handover call is generated from an external mobile communication base station 210 (S41), the handover call is generated. It is determined whether there is an available channel in the base station 210 (S42), and if it is determined that there is an available channel, the channel is allocated to the handover call (S43). After updating the information of the corresponding call (S44) to end.

On the other hand, if it is determined that there is no channel available in step S42, the generated handover call is enqueued (S45), and if the strength of the handover call signal does not exceed the reference value, the channel availability is continuously If it is available, it starts from the step S43 (S46, S47), and if there is no channel available and the strength of the handover call signal falls below the reference value, the handover call is forcibly disconnected and then terminated. (S48).

 As described in detail above, according to the packet-based mobile telephone premises exchange apparatus and the call processing method using the same, a packet-based network is established in the premises to enable voice and data communication between mobile telephones and It is also possible to interwork with mobile and data communication networks, and in the case of handoff or lack of idle channels in the base station, it is effective in distributing channel demand and increasing channel utilization.

Claims (7)

In the local mobile communication network for mutual call connection processing between mobile phones, A call server that performs overall call processing control including setting up, releasing, and registering a call with a mobile telephone in the local mobile communication network; A plurality of network terminators connected to the call server via a packet-based network, each performing a radio channel interface function between the packet-based network and a mobile telephone under the control of the call server; And And a network interworking device that supports interworking of the packet-based network and the global mobile communication network, wherein the voice data exchange between the plurality of network end devices is performed by a packet method through the packet-based network. Mobile phone premises switching system. The method of claim 1, And a communication network access means for interconnecting the packet-based network with another data communication network. A call server for call processing control, a plurality of network terminators performing a wireless channel interface function between an on-premises packet-based network and a mobile phone under control of the call server, and interworking with the packet-based network and a global mobile communication network In the method for the mutual call connection processing between mobile phones, provided with a network interworking device to support, Converting a call originating radio signal received from an originating mobile telephone into a call originating packet signal including a corresponding address through an originating network terminator; Receiving the converted call originating packet signal at the call server to confirm whether the incoming mobile telephone is registered with a location, and transmitting the call originating packet signal to the destination network terminating device at the identified location; A third step of converting the transmitted call originating packet signal into a radio signal through the terminating network termination device and transmitting the radio signal to the terminating mobile telephone; A fourth step of converting a call incoming radio signal of the called mobile phone into a call incoming packet signal including a corresponding address through the called network terminating device and transmitting it to the calling network terminating device; And The calling network terminating device and the called network terminating device, which recognize each other's address based on call processing control of the call server, exchange voice data between the incoming and outgoing mobile telephones in the form of a packet using the address. A call processing method in a packet-based mobile switched premises switching network comprising a fifth step. The method of claim 3, wherein In the second step, if the location of the incoming mobile phone is not registered, the packet-based network and the mobile communication network are interworked by transmitting the call origination packet signal to the global mobile communication network through the interworking device. A call processing method in a packet-based mobile telephone premises exchange apparatus characterized by the above-mentioned. A first step of determining whether the mobile phone is in a hand-off area; Calculating a duration of stay in the handoff area and confirming whether the calculated time exceeds a predetermined time; And If it is determined that the duration exceeds the predetermined time, a call processing in the cellular telephone switching network, comprising a third step of selecting a channel having a relatively high signal strength and disconnecting other channels. Way. The method of claim 5, wherein When the mobile phone leaves the handoff area and enters the corresponding service area of the disconnected channel base station, recovering the disconnected channel before disconnection of the selected channel. Method of call processing. The method of claim 5, wherein The first step is, when the mobile telephone is confirmed to be in the handoff area of the redundant service area of the local area network and the global mobile communication network, Call processing in the mobile switched premises switched network after confirming the network shares of the premises switched network and the global mobile communication network to be handed off, and then using a channel of a relatively low share of the network. Way.

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