KR20060005641A - Transmitting method of signal message for application layer service in cdma 1x evdo system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a Code Division Multiple Access (CDMA) 1x EVDO (Evolution Data Only) system, and more particularly, to the processing of an application layer signal such as a push to talk (PTT) service in a dormant state. .

2. The technical problem to be solved by the invention

The present invention provides a method for transmitting a signal message for an application layer service for an idle terminal in an access network of a CDMA2000 1X EVDO system to provide a fast application service for a terminal in a Dormant state in a CDMA2000 1X EVDO system. For that purpose.

3. Summary of the Solution of the Invention

The present invention provides a method of transmitting a signal message for an application layer service in a Code Division Multiple Access (CDMA) 1x EVDO (Evolution Data Only) system supporting a DOS (DataOverSignaling) protocol. Receives a signal message for an application layer service from a first mobile terminal in a dormant state as a DOS message along with a call connection request message for the first mobile terminal and transmits it to the application layer service server through a PCF / PDSN. A first step of making; The second AN to which the second mobile terminal, which is the destination terminal of the application layer service, belongs, receives and analyzes a signal message for the application layer service from the application layer service server through the PCF / PDSN and is idle with a paging message. Transmitting to the second mobile terminal in progress; The second AN receives a response message for a signaling message for the application layer service from the second mobile terminal together with a call connection message for the paging message and transmits the response message to the application layer service server through a PCF / PDSN. A third step of doing; The first AN receives the response message transmitted from the application layer service server through the PCF / PDSN, performs scheduling according to a call connection state with the first mobile terminal, and delivers the response message to the first mobile terminal. Including the fourth step.

4. Important uses of the invention

The present invention is used for PTT service.

Application Layer Services, EVDO, PTT

Description

Transmitting Method of Signal Message for Application Layer Service in CDMA 1x EVDO System             

1 is a configuration diagram of a general CDMA 1x EVDO system for providing a PTT service.

2 is a timing diagram of a method for transmitting an application layer signal message for a PTT service in a CDMA2000 1x EVDO system according to the present invention;

TECHNICAL FIELD The present invention relates to a Code Division Multiple Access (CDMA) 1x EVDO (Evolution Data Only) system, and more particularly, to processing an application layer signal such as a push to talk (PTT) service in a dormant state. .

In general, a CDMA 1x EVDO system includes an access terminal (AT), an access network (AN), a packet control function (PCF), and a packet data service network (PDSN).

In particular, the CDMA 1x EVDO system for providing a PTT service is configured as shown in FIG. 1.

1 is a configuration diagram of a general CDMA 1x EVDO system for providing a PTT service.

As shown in FIG. 1, a general CDMA 1x EVDO system for providing a PTT service includes a mobile terminal (AT: Access Terminal) 10 supporting PTT, equipped with a PTT button, and capable of wireless access according to the CDMA2000 1X standard. ), An access network (AN) 20 for transmitting and receiving packets to and from the mobile terminal 10 through a wireless channel, and the access network 20 and a packet data service node (PDSN) 40 Packet control function (PCF) 30 which performs a buffering function and data management function of the terminal and data transmitted via the access network 20 using IP (Internet Protocol) or the like. A packet data service node 40 connected to the communication network 50 and a packet communication service 50 connected to the packet communication network 50 manage a PTT session and receive voice packets from a talker. Relaying to include the PTT server 60.

Here, the AN 20 is connected to the PCF 30 through the A8 / A9 interface, and the PCF 30 is connected to the PDSN 40 through the A10 / 11 interface. In addition, the terminal 10 is connected to a PDSN 40 that processes wireless data and an Internet Point to Point Protocol (PPP) data link layer, and is connected to a packet communication network 50 such as the Internet.                         

In the CDMA 1x EVDO system for providing a PTT service as shown in FIG. 1, a session initiation protocol (SIP) is used for signaling transmission as a protocol for the PTT service and a real time transport (RTP) for real-time voice packet transmission. protocol) can be used. SIP is an end-to-end and server-client signaling protocol that exchanges session information required before starting a call and removes session information that was in progress after the call. .

In general, the PTT service refers to a service that enables a user to make a call after selecting a subscriber or group who wants to make a voice call among a group of friends or a general user displayed on the terminal while the user is logged in. Calling this service establishes 1: 1 or group call path in the network providing PTT service, and mutual call is possible through this call path. In particular, the advantage of this service is that you can start talking just by pressing the PUSH button, unlike a regular phone, and economically implement group calls by three or more participants. In order to provide optimal PTT service, it is necessary to reduce PTT call setup delay time as much as possible.

When the application service of the CDMA 1x EVDO system requires rapid data transmission to a terminal in a Dormant state, the access network (AN) should support it. In particular, when providing a PTT service requiring a quick call setup process, a quick call setup procedure through an access network should be available.

To this end, when the access network transmits an application layer signal to a called terminal that is in a dormant state, the access network that receives the PPP frame from the PDSN transmits it as a DOS (DataOverSignaling) message or sends an idle terminal in a dormant state. After switching to the active state, you must decide whether to send over the traffic channel.

In addition, when the response of the application layer signal transmitted from the originating terminal is received from the called terminal to the access network, the application layer signal message should be transmitted to the calling terminal as soon as possible by scheduling it separately from the existing data traffic. Therefore, although the access network needs to send an application layer signal message as soon as possible and schedule it first, the CDMA 1x EVDO Inter-Operability Specification (IOS) specification does not clearly describe this. It is necessary to arrange.

The present invention has been made in accordance with the above-described needs, and provides an application for an idle terminal in an access network of a CDMA2000 1X EVDO system to provide a fast application service for a terminal in a Dormant state in a CDMA2000 1X EVDO system. The purpose is to provide a signaling message transmission method for layer services.

Another object of the present invention is to provide a scheduling method for giving priority to application layer signals in an access network of a CDMA2000 1X EVDO system.

In order to achieve the above object, the present invention provides a signal message transmission method for an application layer service in a Code Division Multiple Access (CDMA) 1x EVDO (EVolution Data Only) system supporting a DOS (DataOverSignaling) protocol. An AN receives a signal message for an application layer service from a first mobile terminal in a dormant state as a DOS message together with a call connection request message for the first mobile terminal and transmits the same through a PCF / PDSN. Transmitting to the application layer service server; The second AN to which the second mobile terminal, which is the destination terminal of the application layer service, belongs, receives and analyzes a signal message for the application layer service from the application layer service server through the PCF / PDSN and is idle with a paging message. Transmitting to the second mobile terminal in progress; The second AN receives a response message for a signaling message for the application layer service from the second mobile terminal together with a call connection message for the paging message and transmits the response message to the application layer service server through a PCF / PDSN. A third step of doing; The first AN receives the response message transmitted from the application layer service server through the PCF / PDSN, performs scheduling according to a call connection state with the first mobile terminal, and delivers the response message to the first mobile terminal. A fourth step is included.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the same components in the drawings are represented by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the embodiment of the present invention illustrates a PPT service in order to improve a method of transmitting an application layer signal message to reduce the maximum latency, but a service of another application layer requiring a quick call setup. It is a technique applicable to (for example, VoIP service). In addition, the embodiment of the present invention will be described based on EVDO Rel.A.

The present invention provides an enhanced access channel or control using a DOS (DataOverSignaling) message to reduce call setup time when a mobile terminal (AT) sets up a PTT call (particularly, a service requiring fast call setup). The present invention proposes a method for transmitting an application layer signal message through a control channel and a method for scheduling an application layer signal message separately from existing data traffic in an access network (AN) when transmitting an application layer signal message through a forward wireless link.

In the embodiment of the present invention, a proposed scheme for reducing call setup time in a CDMA2000 1x EVDO system is configured as follows. It is assumed that the mobile terminal AT processes an application layer signal message in an active state, and transmits an application layer signal message for call establishment of an application layer service after transitioning to an idle state. .

Similarly, it is assumed that a called terminal receives an application layer signal message in a Dormant state.

2 is a timing diagram for a method of transmitting an application layer signal message for a PTT service in a CDMA2000 1x EVDO system according to the present invention.

Referring to FIG. 2, a method of transmitting an application layer signal message for a PTT service in a CDMA2000 1x EVDO system according to the present invention will first be described. First, an originating terminal (AT 1) 10-1 and a PTT of a PTT service will be described. It is assumed that the CDMA2000 1x EVDO system including the called terminal (AT 2) 10-2 of the service is in a Dormant state (201).

If the AT 1 (10-1) in idle state inputs the PTT button to request the PTT service (202), the AT 1 (10-1) does not have a call setup with AN 1 (20-1) expansion channel Using the Enhanced Access Channel's 38.4kbps data rate, the Data Overflow message is sent to the AT 2 (10-2) for the PTT service simultaneously with the Connection Request Message (or Route Update Message) for call setup. In step 203, the DOS (DataOverSignaling) message of the signaling protocol is transmitted to the AN 1 20-1.

The AN 1 20-1 transmits an AC Ack message to the AT 1 10-1 in response to the access request message for call setup (204).

The AN 1 20-1 transmits an invitation message for the AT 2 10-2 to the PTT server 60 through the PCF / PDSN 30/40 (205). In addition, AN 1 20-1 performs a call setup process with AT 1 10-1.

The PTT server 60 analyzes the invitation message to the AN 2 (20-2) where the corresponding AT 2 (10-2) exists through the PCF / PDSN (30/40) for the AT 2 (10-2). Send the invitation message (206).

In AN 2 (20-2) where AT 2 (10-2) is present, paging for call setup for AT 2 (10-2) and call setup for idle AT 2 (10-2) In the present invention, the AN 2 (20-2) determines whether the packet received through the PCF / PDSN (30/40) is an application layer signal message, AT 2 (10- 10). In step 207, a DOS message is sent to the AT-2 10-2 together with the paging message for call setup. At this time, AN 2 (20-2) transmits to the AT 2 (10-2) using a sub-synchronous capsule of the control channel (Control Channel).

In this case, in order to determine whether the AN 2 20-2 transmits the application layer signal message to the terminal in the form of a DataOverSignaling message, it is necessary to distinguish the application layer signal message from various messages transmitted to the AN. In the embodiment of the present invention, the AN determines whether the received message is an application layer signal message. The PDSN indicates that the packet is transmitted from the application server (that is, the PTT server in the embodiment of the present invention) to the application layer signal message. Transmitted to / PCF and PDSN / PCF is forwarded to the AN through the A10 / A11 interface and detected by the AN, and when the calling terminal sends a DOS (DataOverSignaling) message, it is sent through the PDSN / PCF in response. There is a method for determining the first packet as an application layer signal message and a method for determining the packet based on the size of the packet.

The AT 2 10-2 further includes an enhanced access channel for a response message for the invitation message of the AT 1 10-1 and a connection request message for performing call setup with the AN 2 20-2. Transmit to AN 2 (20-2) via (208).

The AN 2 20-2 transmits an AC Ack message to the AT 2 10-2 in response to the connection request message transmitted from the AT 2 10-2 (209).

The AN 2 20-2 transmits a response message to the invitation message of the AT 2 10-2 to the PTT server 60 through the PCF / PDSN 30/40. In addition, AN 2 (20-2) performs a call setup process with AT 2 (10-2).

And the PTT server 60 analyzes the response message to the invitation message AT 2 (1) to the AN 1 (20-1) that the AT 1 (10-1) is the originating terminal through the PCF / PDSN (30/40) 10-2) and transmits a response message (211).

The AN 1 20-1 performs a scheduling delay to transmit a response message of the AT 2 10-2 to the AT 1 10-1, and performs an scheduling delay after the AT 1 10-10. In step 213, a response message of the AT 2 10-2 is transmitted through the traffic channel.

Here, the scheduling delay is performed to transmit a response message of the AT 2 10-2 to the AT 1 10-1 through the traffic channel. That is, after AT 1 10-1 makes a connection request, AN 1 20-1 and TCH (Traffic CHannel) setup process 214 are performed. After TCH setup is completed, AT 2 10-2 is performed. If the response message is transmitted to the traffic channel (Traffic Channel) is transmitted, if the response message of the AT 2 (10-2) before the TCH setup is completed can be transmitted to the control channel (Control Channel). However, in the embodiment of the present invention, the response message of the AT 2 10-2 is transmitted using a traffic channel, regardless of whether the TCH setup is completed at the time when it is delivered to the AN 1 20-1. do. For this purpose, a scheduling delay is performed.

Therefore, through scheduling delay, AN 1 20-1 completes TCH setup when TCH setup is not completed at the time when response message of AT 2 10-2 is transmitted through PCF / PDSN 30/40. The response message of the AT 2 10-2 is buffered until a time point is transmitted and transmitted through the traffic channel. Also in this case, the response message of AT 2 10-2 is scheduled in preference to other traffic processed by AN 1 20-1.

Accordingly, like the AN 2 20-2, the AN 1 20-1 may need to distinguish an application layer signal message from various messages transmitted to the AN. In the embodiment of the present invention, the AN determines whether the received message is an application layer signal message. The PDSN indicates that the packet is transmitted from the application server (that is, the PTT server in the embodiment of the present invention) to the application layer signal message. Transmitted to / PCF and PDSN / PCF is forwarded to the AN through the A10 / A11 interface and detected by the AN, and when the calling terminal sends a DOS (DataOverSignaling) message, it is sent through the PDSN / PCF in response. There is a method for determining the first packet as an application layer signal message and a method for determining the packet based on the size of the packet.

In general, the forward transmission in the AN of the CDMA2000 1x EVDO system is a time division multiplexing (TDM) method, which allocates traffic to a user at a minimum schedule period of 1.66 msec and transmits traffic data of the corresponding user according to the assigned period. to be. Therefore, the AN according to the present invention can identify that the message is an application layer signal message, and accordingly, the scheduler located inside the AN according to the present invention gives a higher priority to the application layer signal message than other traffic. This minimizes the schedule delay in the transmission of application layer signal messages.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited by the drawings.

The present invention as described above, by providing information about the application layer signal message to the AN in the CDMA 1x EVDO system, it is possible to quickly schedule the application layer signal message without delay.

In addition, the present invention, by delivering the application layer signal to the destination terminal in the idle state through the DOS message, compared to the prior art that was transmitted over the traffic channel after call setup performance of the service, such as the PTT service is a problem It is effective to increase.

Claims (9)

A method of transmitting a signal message for an application layer service in a Code Division Multiple Access (CDMA) 1x EVDO (Evolution Data Only) system supporting a Data Over Signaling (D.O.S) protocol, The first AN receives a signal message for an application layer service from a first mobile terminal in a Dormant state as a DOS message along with a call connection request message for the first mobile terminal and sends it to the PCF / PDSN. A first step of transmitting to the application layer service server through a Packet Control Function / PAcket Data Service Network; The second AN to which the second mobile terminal, which is the destination terminal of the application layer service, belongs, receives and analyzes a signal message for the application layer service from the application layer service server through the PCF / PDSN and is idle with a paging message. Transmitting to the second mobile terminal in progress; The second AN receives a response message for a signaling message for the application layer service from the second mobile terminal together with a call connection message for the paging message and transmits the response message to the application layer service server through a PCF / PDSN. A third step of doing; And The first AN receives the response message transmitted from the application layer service server through the PCF / PDSN, performs scheduling according to a call connection state with the first mobile terminal, and delivers the response message to the first mobile terminal. The signal message transmission method for an application layer service in a CDMA 1x EVDO system comprising a fourth step. The method of claim 1, The application layer service is a method for transmitting a signal message for an application layer service in a CDMA 1x EVDO system, characterized in that the PTT service. The method according to claim 1 or 2, The second step, A fifth step to which a second AN to which a second mobile terminal which is a destination terminal of the application layer service belongs, receives a signal message for the application layer service from the application layer service server through the PCF / PDSN; A sixth step of analyzing the received message; And As a result of the analysis, it is confirmed that the signal message is for the application layer service, and the second mobile terminal is idle with the paging message for call connection to the second mobile terminal by using the signal message for the application layer service as a DOS message. Method of transmitting a signal message for an application layer service in a CDMA 1x EVDO system comprising a seventh step of transmitting to the CDMA 1x EVDO system. The method according to claim 1 or 2, The fourth step is A fifth step in which the first AN receives the response message transmitted through the PCF / PDSN from the application layer service server; A sixth step of analyzing the received message; And A seventh step of confirming that the response message is a response message to the signal message for the application layer service and confirming a connection state with the first mobile terminal; An eighth step of transmitting the response message to the first mobile terminal when the connection state is a traffic state; And If the connection state is not a traffic state, performing a scheduling delay for the response message to establish a traffic state with the first mobile terminal and then transmitting the response message to the first mobile terminal CDMA 1x Method of transmitting signal message for application layer service in EVDO system. The method of claim 3, wherein In order for the second AN to analyze the received message and confirm that it is a signal message for the application layer service, the application layer service server indicates and transmits the signal message for the application layer service. Method of transmitting signal message for application layer service in CDMA 1x EVDO system. The method of claim 3, wherein In the CDMA 1x EVDO system, the second AN checks the packet size of the signal message for the application layer service so as to analyze the received message to confirm that it is a signal message for the application layer service. How to send signal messages for application layer services. The method of claim 4, wherein CDMA, characterized in that the application layer service server indicates that the signal message for the application layer service and transmits in order to determine that the first AN is a signal message for the application layer service by analyzing the received message. Method of transmitting signal message for application layer service in 1x EVDO system. The method of claim 4, wherein In the CDMA 1x EVDO system, the first AN checks the packet size of the signal message for the application layer service to analyze the received message to confirm that it is a signal message for the application layer service. How to send signal messages for application layer services. The method of claim 4, wherein In order to confirm that the first AN is a signal message for the application layer service by analyzing the received message, when the first mobile station transmits a DOS (DataOverSignaling) message, it sends the PDSN / PCF in response. A method of transmitting a signaling message for an application layer service in a CDMA 1x EVDO system, characterized by checking whether the packet is the first packet transmitted.

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