KR100675166B1 - Method for processing of binary SIP message in wireless communication system - Google Patents

Abstract

The present invention provides a method for processing a binary SIP message in a wireless communication system. When a terminal tries to set up a call, a method for generating a binary SIP message format by combining a call ID with a random value part of a from tag and a via branch is provided. Step 1; By including the second step of transmitting the binary SIP message generated in the first step to the access channel, by generating a message in a binary SIP message format reduced in size corresponding to the call ID to reduce the call setup time and traffic It can be reduced.

Description

Method for processing of binary SIP message in wireless communication system

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2 is a block diagram of a wireless communication system to which the present invention is applied;

3 is a flowchart illustrating a binary SIP message processing method of a wireless communication system according to the present invention;

4 is a conceptual diagram illustrating a binary SIP message format used in the present invention.

5 is a conceptual diagram illustrating a concept of encoding and decoding a binary SIP message by applying the present invention;

FIG. 6 is a conceptual diagram illustrating an example of a configuration of an MT in FIG. 4.

FIG. 7 is a conceptual diagram illustrating an example of a configuration of an AP in FIG. 4.

8 is a conceptual diagram illustrating an example of a configuration of ST in FIG. 4,

9 is a conceptual diagram illustrating an example of generation of a via branch in FIG. 4;

FIG. 10 is a conceptual diagram illustrating an example of generating a Call ID in FIG. 4.

FIG. 11 is a conceptual diagram illustrating an example of generating an OID / TID in FIGS. 9 and 10.

Explanation of symbols on the main parts of the drawings

10: calling terminal 20: SIP proxy

30: application server 40: register

50: Presence Server 60: Incoming Terminal

The present invention relates to a method of processing a binary SIP (Session Initiation Protocol) message in a wireless communication system, and in particular, generates a call in a binary SIP message format having a reduced size corresponding to a call ID. The present invention relates to a binary SIP message processing method of a wireless communication system suitable for shortening traffic and reducing traffic.

In general, SIP refers to a protocol for controlling a call of a general telephone service to connect a telephone by using an Internet Protocol (IP) network. Such SIP is an application layer control protocol of the Open System Interconnection (OSI) basic reference model that can set up, change, and terminate a multimedia session layer or call.

So SIP is a very simple text-based application layer control protocol that allows one or more participants to create, modify, and terminate sessions together. These sessions include teleconferences over the Internet, telephone calls, visits, event notifications, instant messaging, and the like. SIP is also based on a client / server architecture where clients initiate a call and the server responds to the call.

The SIP message processing method of the conventional wireless communication system is as follows.

Obtaining a traffic channel if attempting to call setup in a conventional wireless communication system; Generating a SIP message including a Call ID after obtaining the traffic channel; A step of transmitting the generated SIP message on a traffic channel is performed.
Here, the factor for identifying the call in the SIP message of the prior art includes a call ID (CalliD), From Tag, To Tag, SIP address. That is, the SIP address among the factors for identifying the call in the SIP message identifies the sender and the receiver, and the Call ID, From Tag, and To Tag uniquely identify the dialogue set in the calling party and the called party. do. At this time, the call ID (CalliD), From Tag, To Tag has a randomly generated value in the calling terminal. SIP messages with such call identifiers are generated with large data close to 1K bytes.

Referring to the operation of the prior art configured as described above is as follows.

An originator or terminator, such as a Push To Talk (PTT) terminal, performs a PTT call setup in a situation in which a Code Division Multi Access (CDMA) traffic channel is not acquired (Dormant State, etc.). Done. This includes both originating and incoming calls.

When attempting to set up a call in the originating / incoming PTT terminal, the traffic channel is first acquired.

Here, the traffic channel refers to a radio frequency channel through which actual voice communication is transmitted, and is distinguished from an access channel, which is a control channel. This traffic channel refers to a pair of forward traffic channels and reverse traffic channels. Also, an access channel refers to a radio control channel used in a communication system connection of a terminal. This refers to the reverse CDMA channel used by the terminal to communicate with the base station. This access channel is used for short signaling message exchanges such as call origination, response and registration to paging, and the like. Also, the access channel is a random access channel having a slot structure.
As described above, the SIP protocol processing is performed by transmitting a SIP message after acquiring the traffic channel.

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However, this conventional technology has the following problems.

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That is, in the prior art, since a SIP message is generated with a large amount of data larger than 1K bytes, the SIP message should be transmitted after the traffic channel is allocated. In this case , the PTT call is not obtained in the situation of obtaining a CDMA traffic channel (Dormant State, etc.). When attempting to set up, the time for acquiring a traffic channel is reflected in the PTT call setup time, thereby increasing the overall PTT call setup time.

In addition, since a traffic channel must be periodically acquired to obtain information for forming a SIP message format such as registration or subscription refresh, there is a problem of increasing traffic of CDMA.

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to generate a message in a binary SIP message format having a reduced size corresponding to a call ID, without having to acquire a traffic channel. The present invention provides a method for processing binary SIP messages in a wireless communication system that can reduce call setup time and reduce traffic by enabling transmission over a network.

Binary SIP message processing method of a wireless communication system according to an embodiment of the present invention to achieve the above object,

A first step of generating a binary SIP message format including a random value of a From Tag and a Via Branch which are combined to attempt to set up a call in the terminal and does not include a call ID ; And a second step of transmitting the binary SIP message generated in the first step to an access channel.

The present invention described above uses three types of call IDs (Callid), From Tag, and To Tag as a factor for identifying a call in SIP of the prior art, and replaces the call ID with a combination of From Tag and To Tag. It is not necessary to include an ID, which makes it possible to reduce the size of the SIP message, allowing the transmission of SIP messages over access channels rather than traffic channels.
Hereinafter, an embodiment according to the present invention, a technical concept of the binary SIP message processing method of a wireless communication system will be described with reference to the drawings.

2 is a block diagram of a wireless communication system to which the present invention is applied.

Here, reference numeral 10 denotes an originator, 20 denotes a SIP proxy that exchanges binary SIP messages with the originating terminal, and 30 denotes a PTT server that exchanges standard SIP messages with the SIP proxy 20. An application server (Application Server), 40 is a register for sending and receiving a standard SIP with the SIP proxy 20, 50 is a presence server for sending and receiving a standard SIP with the application server 30, 60 is the A terminator that sends and receives a binary SIP message with the SIP proxy 20.

3 is a flowchart illustrating a binary SIP message processing method of a wireless communication system according to the present invention. 4 is a conceptual diagram illustrating a binary SIP message format used in the present invention.

As shown in the figure, when attempting to call setup in a terminal, a first step (ST11) (ST12) of generating a binary SIP message format by combining a call ID with a random value portion of a from tag and a via branch (ST11). Wow; And a second step ST13 of transmitting the binary SIP message generated in the first step to an access channel.

In the first step, the binary SIP message format indicates that the binary SIP message is a binary SIP message (for example, a value of “1110”), an SIP (SIP Method Type), an Application ID (AP), a Service Type (ST), and an Originator (OID). Characterized in that it comprises a random value ( ID), Terminator ID (TID), To Tag (To Tag Random Value), From Tag (From Tag Random Value) and Via Branch (Via Branch Random Value) do.

In the above, the Via Branch is divided into a uniquely distinguishable part and a random value part, and the only distinguishable part is generated according to a pre-promised method in the calling / called terminal and is present. Transactions can be uniquely identified and generated using OID and TID for this purpose, and the random value portion is generated as a 4-bit random value. In this case, a 4-bit random value is used to generate a call ID.

The Call ID random value is configured by dividing it into a uniquely distinguishable part and a random value part, and the uniquely identifying part is generated according to a pre-promised method in the originating / receiving terminal and the current transaction. (Transaction) can be uniquely identified and is generated using OID and TID for this purpose. The random value portion has a random value of 8 bits that combines 4 bits of the random value portion of the via branch and 4 bits of the from tag. Is generated.

In the second step, the binary SIP message may be included in a short data burst (SDB) message and transmitted.

An operation of the binary SIP message processing method of the wireless communication system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention enables the call ID to be generated by using the random value parts of the From Tag and the Via Branch to exclude the call ID from being included in the SIP message, thereby corresponding to the call ID. The purpose is to reduce call setup time and reduce traffic by enabling binary SIP messages with reduced size to be transmitted over an access channel .

Thus, in the present invention, when attempting to set up a call in a terminal such as a PTT terminal (including both originating and receiving terminals) in a situation where a CDMA traffic channel is not obtained, the SIP message is transmitted to the access channel without setting the traffic channel. do.

This requires a message format encoded in a specific way, which is called a Binary SIP message.

When the binary SIP message is transmitted and received through the access channel, the binary SIP message is included in the SDB (Short Data Burst) message to be transmitted and received.

5 is a conceptual diagram illustrating a concept of encoding and decoding a binary SIP message by applying the present invention.

Thus, encoding a standard SIP message results in a binary SIP message, while decoding a binary SIP message results in a standard SIP message.

This encoding / decoding is performed between the originating / receiving terminal 10 (60) and the SIP proxy 20 in FIG.

4 shows the binary SIP message format proposed by the present invention.

Here, "1110" indicates that this is a binary SIP message.

MT is a "SIP Method Type" and includes INVITE, REGISTER, SUBSCRIBE, and the like.

In addition, the AP is an "Application ID" and includes PTT, Video Telephony (VT), Instant Messaging Service (IMS), and the like.

ST is a "Service Type" and includes a Selective Buddy Call, a Group Call, and the like.

In addition, the OID is an "Originator ID", which indicates the sender's identifier. For CDMA, this is the sender's Mobile Directory Number (MDN).

In addition, TID is a "Terminator ID" and indicates an identifier of a called party. In the case of CDMA, it is the recipient's MDN. The TID can also indicate the group ID of the called group.

To Tag is also "To Tag Random Value".

Also, the From Tag is "From Tag Random Value". This From Tag includes the CSeq value in the binary SIP message by having the same value as the CSeq Value.

Via Branch is also the "Via Branch Random Value".

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6 is a conceptual diagram illustrating an example of a configuration of an MT in FIG. 4.

So for "INVITE" origination / reception, additional information is needed for services such as PTT, VT, IMS (PTT Server SIP Address, Expire Time, Max Forwards, etc.).

In addition, this information is obtained from service registration procedures such as Registration (REGISTER) and Subscription (SUBSCRIBE), which are executed when the application is running for services.

The obtained information is used when encoding / decoding binary SIP messages for registration refresh, subscription refresh, call setup, and the like.

7 is a conceptual diagram illustrating a configuration example of an AP in FIG. 4, and FIG. 8 is a conceptual diagram illustrating a configuration example of an ST in FIG. 4.
FIG. 7 illustrates a 2-bit AP value indicating an “Application ID” for identifying an application such as PTT, video telephony (VT), instant messaging service (IMS), etc. in FIG. 4. Because SIP can be used for various applications such as video call (VT), PTT, voice call, instant messaging (IMS), it is necessary to indicate which application SIP is used for. For example, "00" may be represented by PTT, "01" by VT, and "10" by voice call.
In the case of FIG. 7, when 2 bits become “00”, PTT is indicated, and “01”, “10”, and “1” are reserved values which are not designated, and “11” is used as a padding bit. An example is shown.
8 illustrates an example of a service type (ST) value in FIG. 4, where the ST value of FIG. 8 indicates a call type currently set, and a Group ID indicates a case in which the call attempts a group call. In case of 1: 1, it is ID to designate counterpart, and Biz Group ID is a case of Business Group among group calls.
In the case of Figure 8, Service Type for (00: PTT), etc. indicates an AP value, the subsequent two bits represent the ST value, only the PTT AP has a "00" bit is defined, ST for the PTT " 00 "designates a group ID," 01 "designates a public ID," 10 "designates a Biz Group ID, and" 11 "designates an example of allocating padding bits.

9 is a conceptual diagram illustrating an example of a Via Branch random value in FIG. 4.

As shown in FIG. 9, the Via Branch random value is divided into a uniquely identifiable part and a random value part.

The only identifiable part here is the part where both incoming / outgoing calls are generated in the promised way.

Also, the only part that can be identified must be the one that uniquely identifies the current transaction.

The only parts that can be identified for these two conditions are OID and TID.

The random value portion is generated as a 4-bit random value, which is included in the binary SIP message format for use in call ID generation.

FIG. 10 is a conceptual diagram illustrating an example of generating a Call ID using a random value of From Tag and Via Branch in FIG. 4.

Therefore, the Call ID random value is divided into a uniquely distinguishable part and a random value part.

The only identifiable part here is the part where both incoming / outgoing calls are generated in the promised way.

Also, the only part that can be identified must be the one that uniquely identifies the current transaction.

The only parts that can be identified for these two conditions are OID and TID.

The random value portion is generated as a random value of 8 bits that combines the random value portion of the From Tag and the Via Branch.
The call ID can be generated by adding the OID and the TID in front of the 8-bit random value obtained by combining the random value portions of the from tag and the via branch generated as described above.

FIG. 11 is a conceptual diagram illustrating an example of generating an OID / TID in FIGS. 9 and 10.

Thus, FIG. 11 shows that the OID / TID portion of the Via Branch or Call ID is configured.

Here, the OID is an ID capable of identifying the calling terminal 10.

In the case of CDMA, all of them can be configured using 9 digits using MDN.

This OID is composed of the remaining parts except for the "01" part of "01x" which is a common part of the domestic operators of the MDN.

If the OID is not 9 digits, padding with "F" from the previous empty space.

On the other hand, the TID is an ID for identifying the called terminal 60.

In the case of CDMA, a TID is configured as follows.

That is, in the case of Selective Buddy Call, 10 digits can be configured using MDN.

In case of Group Call, it can be configured with 10 digits using the selected Group ID.

If the TID is less than 10 digits, pad it with "F" from the previous empty space.

In the case of Selective Buddy Call, it consists of the remaining parts except for the "01" part of the common part "01x" of the domestic operator among the MDN. Only the TID of one of the selected buddies is included in the binary SIP message.

In the case of Group Call, the 10-digit Group ID is converted into 8 nibble binaries, and the first nibble is padded with "F" and included in the binary SIP message.

As such, the present invention reduces the call setup time and reduces the traffic by generating a message in a binary SIP message format having a reduced size corresponding to a call ID.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the binary SIP message processing method of the wireless communication system according to the present invention has the effect of reducing the call setup time and traffic by generating a message in a binary SIP message format with a reduced size corresponding to a call ID. Will be.

In addition, in the present invention, when a call ID occupying a considerable portion of size is generated by combining a random value part of a From Tag and a Via Branch, the call ID is not included in the binary SIP message format. You can save.

In addition, compared to the binary SIP message format currently applied to SKT's PTT, the present invention has an advantage of reducing 8 bits.

Claims (5)

When attempting to set up a call in a terminal, a combination of generating a binary SIP message format including a From Tag representing a CallD random value and a random value of a Via branch and not including a call ID. Steps; And performing a second step of transmitting the binary SIP message generated in the first step to an access channel. The binary SIP message format generated in the first step is: The binary SIP message processing method of the wireless communication system, characterized in that it further comprises a display indicating that it is a binary SIP message, a random value of MT, AP, ST, OID, TID, To Tag . The method of claim 2, wherein the random value of the Via Branch , A uniquely identifiable part generated using OID and TID and a random value part generated by a 4-bit random value for this purpose. How to handle binary SIP messages. The method of claim 3, wherein the call ID random value is, A binary SIP message processing method of a wireless communication system, comprising a uniquely identifiable part consisting of an OID and a TID, and a random value part consisting of an 8-bit random value obtained by adding a random value of a from tag and a via branch. . 5. The method of claim 1, wherein the second step comprises: Binary SIP message processing method of the wireless communication system, characterized in that for transmitting the binary SIP message generated in the first step including the SDB message.

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