KR20060003507A - Cdma wireless network system for ptt service and method for processing packet therein - Google Patents

Abstract

The CDMA wireless network system for the PTT service according to the present invention determines the PTT service-related information of the packet flowing from the service providing server to determine the packet by the push to talk (PTT) indication information and the GRE header in which the PTT characteristic information is set. When receiving the PDSN encapsulated and transmitted, and the packet encapsulated by the GRE header from the PDSN, a PCF for processing the packet according to the PTT-related information of the packet with reference to the GRE header of the packet.

According to the present invention, when the PDSN can receive information indicating that the SDB is on the IP layer from a service providing server such as a PTT server or can determine a packet type from a packet flowing into the PDSN, the PDSN, PCF, and PCF can be determined. The SDB separation function can be effectively performed on the GRE interface between the BS and the BS.

PTT. PTD, PDB, PDSN, PCF, GRE Header

Description

CDMA wireless network system for packet service and packet processing method {CDMA WIRELESS NETWORK SYSTEM FOR PTT SERVICE AND METHOD FOR PROCESSING PACKET THEREIN}             

1 is an exemplary configuration diagram of a GRE header for classifying packets for SDB according to a conventional technique.

2 is a system configuration diagram of a CDMA wireless network providing a PTT service according to the present invention.

3 is a block diagram for explaining an interface set in a mobile communication service providing system.

4 is a diagram illustrating a configuration of a GRE header for identifying an SDB according to an embodiment of the present invention.

5 is an exemplary diagram of a PTT information field defined in a GRE header according to an embodiment of the present invention.

6 is an exemplary diagram of an SDB packet type field set in a GRE header according to an embodiment of the present invention.

7 is a diagram illustrating an example of a packet type field set in a GRE header according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1 terminal 2 BS

3: PCF 4: PDSN

5: service providing server

The present invention relates to a PTT service, and more particularly, when using a short data burst (SDB) for a push to talk (PTT) service in a CDMA wireless network or a multiple service instance (Session). A PTT service that enables efficient multiple service instance support using a single A10 connection in a network element below a packet data serving node (PDSN) for a packet data service having The present invention relates to a CDMA wireless network system and a packet processing method thereof.

PTT service is one of the packet data services newly introduced in the CDMA wireless network. It uses SDB (short data burst) to reduce call setup latency and to call subscribers including group. have.

Short data burst (SDB) is a function for transmitting a relatively small amount of packets from the PDSN to the terminal using an overhead channel or a traffic channel.

The existing CDMA wireless network does not support the function of distinguishing from other packets on the interface connected to the PTT server, PDSN, PCF, and BSS. Accordingly, the existing CDMA wireless network does not support a function for distinguishing a packet for SDB from another data packet for transmitting the SDB from the network element below the PDSN to the terminal.

The conventional technique proposed to solve this problem is to set and support unused flag bits of the GRE header of the GRE interface between PDSN and PCF, PCF and BS.

1 is a diagram illustrating a format of a GRE header for classifying a packet for SDB according to a conventional technique.

Referring to FIG. 1, in the related art, an indicator for distinguishing a packet for SDB is used by setting any one bit among flags bits. Setting the remaining fields or bits is the same as setting the existing GRE.

Meanwhile, when performing a PTT service, a SIP (Session Initiation Protocol) delivered in an SDB may need to be classified and transmitted to the UE in order to support the PTT service. For example, there may be a case where the same SDB packet is delivered to the terminal but different.

In addition, due to other needs, the service may need to be extended or PTD, PTS, and IM services may be simultaneously supported together with the PTT service.                         

However, if the conventional technique of distinguishing SDB packets by appropriately setting unused flag bits in the GRE header is applied, the GRE flag bits cannot be supported alone, and lag bits cannot be used for other purposes. In other words, it is difficult to support scalability.

The present invention has been made to solve such a problem in the prior art, when the PTT service is extended, or if the same SDB packet but the method of delivery to the terminal is different, the operation in the BS or PCF should be separated, or the PTT service and In addition, when PTD, PTS, IM services, etc. are simultaneously supported, the object of the present invention is to provide a CDMA wireless network system and a packet processing method for a PTT service to efficiently support this in one A10 connection.

According to an aspect of the present invention for achieving the above object, by determining the PTT service-related information of the packet flowing from the service providing server to determine the PTT (Push To Talk) information and the packet by the GRE header is set PTT characteristics information When receiving a packet encapsulated by the GRE header from the PDSN and the PDSN encapsulated and transmitted, the PTT service including a PCF for processing the packet according to the PTT-related information of the packet with reference to the GRE header of the packet Provided is a CDMA wireless network system.                     

According to another aspect of the present invention, determining the PTT service-related information of the incoming packet, and setting the PTT (Push To Talk) information and the PTT characteristic information in the GRE header based on the determined PTT information; Packet processing of a system of a CDMA wireless network providing a PTT service, comprising: encapsulating a corresponding packet by a push to talk (PTT) indication information and a GRE header in which PTT characteristic information is set, and transmitting the packet to a counterpart node in which a tunnel is set; Provide a method.

According to another aspect of the present invention, determining the PTT service-related information of the incoming packet, and if the determination result is a PTT-related packet, the step of setting an arbitrary value to the PTT indication bit defined in the GRE header, Setting an arbitrary value to the PTT information field defined in the GRE header based on the determined PTT related information, encapsulating the corresponding packet by the GRE header in which the Push To Talk (PTT) indication bit and the PTT information field are set, Provided is a packet processing method of a system of a CDMA wireless network that provides a PTT service including transmitting to a set counterpart node.

According to another aspect of the present invention, upon receiving an arbitrary packet encapsulated by a GRE header, reading the value set in the PTT indication bit defined in the GRE header, and if the arbitrary value is set in the PTT indication bit, Determining that the PTT information field exists and finding the PTT information field in the GRE header and reading the value set in the PTT information field, and determining the PTT related information of the corresponding packet according to the value set in the PTT information field and according to the PTT related information. A packet processing method of a CDMA wireless network system for a PTT service for processing a packet is provided.                     

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a system configuration diagram of a CDMA wireless network providing a PTT service according to the present invention.

Referring to FIG. 2, a system of a CDMA wireless network that provides a PTT service includes a terminal 1 (Mobile Station: MS), a BS (Base Station) 2, a PCF (Packet Control Function) 3, and a PDSN ( Packet Data Serving Node (4) and a service providing server (5).

The terminal 1 and the BS 2 are connected by a wireless link, and the BS 2 and the PCF 3 and the PDSN 4 are connected by a wired network.

The PDSN 4 is connected to the service providing server 5 through an IP network.

The terminal 1 transmits a request message in the form of SIP to the BS 2 according to the subscriber's selection.

The BS 2 then transmits a request message transmitted from the terminal 1 existing in the serving cell to the PDSN 4 via the PCF 3.

The PDSN 4 establishes a PPP session with the terminal 1 according to the received request message, converts the request message into an IP packet, and transmits the request message to the service providing server 5.

The service providing server 5 provides a mobile communication service according to the received request message.

In this case, a network including the terminal 2, the PCF 3, and the PDSN 4 is called an access network that allows the terminal 1 to access the IP network.                     

The service provided by the service providing server 5 includes a real-time multimedia provided by interworking a mobile communication network and an IP network such as a push to talk (PTT) service, a push to data (PTD) service, an image message (IMD) service, and the like. It can be a service.

3 is a block diagram illustrating an interface set in a mobile communication service providing system.

As shown in FIG. 3, the RP (Radio Packet) interface is set for the terminal 1 and the BS 2, the A8 / A9 interface is set for the BS 2 and the PCF 3, and the PCF 3 ) And the PDSN (4) is set A10 / A11 interface.

The A8 interface and the A10 interface are interfaces for exchanging traffic, and the A9 interface and the A11 interface are interfaces for exchanging signaling.

In the system of the CDMA wireless network providing the PTT service according to the present invention, the PTT indication information and the PTT characteristic information are set in the GRE header of the GRE interface between the PDSN and the PCF, and the PCF and the BS. 4) On the interface connected to the PCF (3) and BS (2), it supports a function for distinguishing the SDB packet and other data packets for transmitting the SDB to the terminal.

Accordingly, when the PDSN 4 receives the SDB packet delimiter or the different packet or delimiter between the packets for supporting the multiple service instance from the service providing server 5 on the IP layer, the PDSN 4 sends the packet to the GRE header. When encapsulating with PTT, the PTT indication information and the PTT characteristic information are set in the GRE header and transmitted to the PCF 3 according to the characteristics of the packet.                     

When the PCF 3 receives the GRE packet from the PDSN 4, the PCF 3 sets the PTT indication information and the PTT characteristic information to the BS 2 in the same manner as the header of the GRE packet transmitted to the BS 2.

BS 2 transmits the SDB to the UE in a manner defined in the GRE header, or performs an operation for supporting multiple service instances.

4 is an exemplary diagram illustrating a configuration of a GRE header for identifying an SDB according to an embodiment of the present invention.

Referring to FIG. 4, in the GRE header according to an embodiment of the present invention, bit 8 is defined as a PTT indication bit (P) among bits 8 through 12 that have been allocated as flag bits in the existing GRE header to set PTT indication information. have.

In addition, a 4-octet PTT information field (PTT information) is defined to set PTT characteristic information.

The PTT indication bit P is a bit indicating that the PTT information field exists in the corresponding GRE header. If the PTT indication bit P is set to '1', it indicates that the PTT information field exists in the GRE header.

The PTT information field is a field for indicating PTT characteristic information on a corresponding packet and may configure a PTT information field as necessary. For example, the PTT information field may be configured according to the type of service performed by the packet or the path through which the packet passes.

Where bit 0 is the bit defined for the checksum and bits 1-7 are the bits defined for each need.

For example, bit 1 (R) is a bit indicating that a routing field exists in a corresponding GRE header. If bit 1 (R) is set to '1', it indicates that a routing field exists in a GRE header.

Bit 2 (K) is a bit indicating that a key field exists in the corresponding GRE header. If bit 2 (K) is set to '1', it indicates that a key field exists in the GRE header.

Bit 3 (S) indicates that a sequence field exists in a corresponding GRE header. If bit 3 (S) is set to '1', bit 3 (S) indicates that a sequence field exists in a GRE header.

Bits 9-12 are flag bits, bits 13-15 are bits indicating the protocol version, and bits 16-31 are bits indicating the protocol type.

5 is an exemplary configuration diagram of a PTT information field defined in a GRE header according to an embodiment of the present invention.

Referring to FIG. 5, the PTT information field of the GRE header according to the embodiment of the present invention may be divided into an SDB Packet Type field, a Packet Type field, a Packet Priority field, and the like. The Reserved field is configured.

The SDB packet type indicates whether the packet is an SDB packet.

The packet type indicates what kind of service the packet is for performing. For example, it indicates whether the packet is a PTT packet for a PPT service or a PTD or IM packet for a PTD or IM service.

The packet precedence field specifies a priority for the packet type previously set. The packet priority field has a value from 0 to 255 and a higher value has a higher priority.

6 is an exemplary diagram of an SDB packet type field set in a GRE header according to an embodiment of the present invention.

Referring to FIG. 6, if 00 is set in the SDB packet type field of one octet, this indicates that the packet is a non-SDB packet. If the value is set to 01, the packet is an SDB packet. Other values are reserved for future service.

7 illustrates an example of a packet type field set in a GRE header according to an embodiment of the present invention.

Referring to FIG. 7, if 00 is set in a packet type field consisting of one octet in the GRE header, this indicates that the packet is a PTT packet. If the set value is 01, the packet indicates a PTD / IM packet. Other values are reserved for future service.

Let's look at some examples where the PDSN encapsulates a packet using the GRE header defined above.

When any packet is received from the service providing server 5, the PDSN 4 encapsulates the received SDB packet using the GRE header defined as described above if the packet is a packet for the SDB. '1' is set in the display bit and '1' is set in the SDB packet type field defined in the PTT information field. If the SDB packet is a PTT packet, '0' is set in the packet type field.

When any packet is received from the service providing server 5, the PDSN 4 encapsulates the received SDB packet using the GRE header defined as described above if the packet is a packet for the SDB. '1' is set in the display bit and '1' is set in the SDB packet type field defined in the PTT information field. If the SDB packet is a PTD packet, '1' is set in the packet type field.

When any packet is received from the service providing server 5, the PDSN 4 indicates a PTT when encapsulating the packet received by the GRE header defined as described above if the packet is not a packet for the SDB. '1' is set in the bit and '0' is set in the SDB packet type field defined in the PTT information field. If the packet is a PTT packet, '0' is set in the packet type field.

On the other hand, let's look at an example of processing when the BS receives any packet from the PCF.

If any packet encapsulated by the GRE header is received through the PCF (3), the BS (2) refers to the GRE header and, if '1' is set in the PTT indication bit of the received packet, It is determined that the PTT information field exists, and the PTT information field is read. If the PTT information field is read and '1' is set in the SDB packet type field, the packet is recognized as a packet for SDB. In addition, if the PTT information field is read and '0' is set in the packet type field, it is determined that the packet is a PTT packet and transmitted to the corresponding UE or a procedure accordingly is performed.                     

On the other hand, when an arbitrary packet encapsulated by the GRE header is received through the PCF 3, the BS 2 refers to the GRE header, and if the '1' is set in the PTT indication bit of the received packet, the corresponding GRE It is determined that the PTT information field exists in the header, and the PTT information field is read. If the PTT information field is read and '1' is set in the SDB packet type field, the packet is recognized as a packet for SDB. In addition, if the PTT information field is read and '1' is set in the packet type field, it is determined that the corresponding packet is a PTD or IM packet, and is transmitted to the corresponding UE or a procedure thereof is performed.

On the other hand, when an arbitrary packet encapsulated by the GRE header is received through the PCF 3, the BS 2 refers to the GRE header, and if the '1' is set in the PTT indication bit of the received packet, the corresponding GRE It is determined that the PTT information field exists in the header, and the PTT information field is read. If the PTT information field is read and '0' is set in the SDB packet type field, it is recognized that the packet is a non-SDB packet. In addition, if the PTT information field is read and '0' is set in the packet type field, it is determined that the packet is a PTT packet and transmitted to the corresponding UE or a procedure accordingly is performed.

According to the present invention, when the PDSN can receive information indicating that the SDB is on the IP layer from a service providing server such as a PTT server or can determine a packet type from a packet flowing into the PDSN, the PDSN, PCF, and PCF can be determined. The SDB separation function can be effectively performed on the GRE interface between the BS and the BS.                     

According to the present invention, the QoS and multiple service instances required for a subscriber to simultaneously use services such as push-to-data (PTD), push-to-send (PTS), instant message (IM), etc. together with the PTT. In consideration of the Instance method, it is possible to support an effective multiple service instance in a network element below the PDSN using a single A10 connection.

In addition, although limited by one A10 connection, it can also support QoS.

Claims (16)

A PDSN encapsulating and transmitting the PTT service related information of the packet flowing from the service providing server and encapsulating the packet by a GTT header in which PTT (Push To Talk) indication information and PTT characteristic information are set; When receiving the packet encapsulated by the GRE header from the PDSN, the CDMA radio network system for a PTT service including a PCF to process the packet according to the PTT-related information of the packet by referring to the GRE header of the packet. The CDMA wireless network system of claim 1, wherein the PTT indication information is information indicating whether PTT characteristic information is present in a corresponding GRE header. The CDMA wireless network system of claim 1, wherein the PTT characteristic information is detailed information representing a characteristic of a PTT related service performed by a packet encapsulated by a GRE header. The method of claim 3, wherein the detail information, CDMA wireless network system for a PTT service including at least one of whether the packet is a packet for the SDB, the service type of the packet, the priority of the packet. The CDMA wireless network system of claim 4, wherein the service type of the corresponding packet includes at least one of PTT, PTD, PTS, and IM. The CDMA radio of claim 1, wherein the PDSN receives information indicating that it is an SDB on the IP layer from the service providing server or determines a packet type from a packet flowing into a PDSN to determine whether the packet is an SDB packet. Network system. Determining PTT service related information of an incoming packet; Setting PTT (Push To Talk) indication information and PTT characteristic information in a GRE header based on the determined PTT related information; A packet processing method of a CDMA wireless network system for a PTT service, comprising: encapsulating and transmitting a corresponding packet by a push to talk (PTT) indication information and a GRE header in which PTT characteristic information is set. The method of claim 7, wherein When receiving the packet encapsulated by the GRE header, the packet processing of the CDMA wireless network system for a PTT service further comprising the step of processing the packet according to the PTT-related information of the packet with reference to the GRE header of the packet. Way. The packet processing method of claim 7, wherein the PTT indication information is information indicating whether PTT characteristic information is present in a corresponding GRE header. 8. The method according to claim 7, wherein the PTT characteristic information is detailed information indicating a characteristic of a PTT related service performed by a packet encapsulated by a GRE header. The method of claim 10, wherein the detail information, A packet processing method of a CDMA wireless network system for a PTT service including at least one of whether the packet is a packet for SDB, a service type of the packet, and a priority of the packet. The method of claim 11, wherein the service type of the corresponding packet includes at least one of PTT, PTD, PTS, and IM. Determining PTT service related information of an incoming packet; If the corresponding packet is a PTT related packet, setting an arbitrary value to the PTT indication bit defined in the GRE header; Setting an arbitrary value in a PTT information field defined in a GRE header based on the determined PTT related information; A packet processing method of a CDMA wireless network system for a PTT service, comprising: encapsulating and transmitting a corresponding packet by a GRE header having a PTT (Push To Talk) indication bit and a PTT information field. The packet processing method of claim 13, wherein the PTT indication bit is a bit indicating whether a PTT information field exists in a corresponding GRE header. The PTT service field of claim 13, wherein the PTT information field indicates a PTT service including at least one of a field indicating whether a corresponding packet is a packet for SDB, a field indicating a service type of the corresponding packet, and a field indicating a priority of the corresponding packet. Packet processing method of CDMA wireless network system for system. Upon receipt of any packet encapsulated by the GRE header, reading the value set in the PTT indication bit defined in the GRE header; Determining that a PTT information field exists in a corresponding GRE header when the PTT indication bit is set, reading a PTT information field in a GRE header and reading a value set in the PTT information field; The packet processing method of the CDMA wireless network system for a PTT service for determining the PTT-related information of the packet according to the value set in the PTT information field and processing the packet according to the PTT-related information.

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