KR20050081988A - Method for transmission of additional information in wireless data service - Google Patents

Abstract

Provided is a method of transmitting packet data including additional information in a wireless data service.

According to the present invention, the packet data service node generates packet data as a GRE packet in order to transmit additional information in the packet data, but the additional information identifier field is included in the GRE packet and the additional information identifier is to be transmitted. Is activated, and the desired additional information is included in the GRE header and transmitted to the packet controller.

According to the present invention, other information that can be referred to or utilized in packet processing can be represented between nodes interworking for data services, thereby improving data processing performance.

Description

Method for Transmission of Additional Information in Wireless Data Service

The present invention relates to a method of transmitting packet data in a wireless data service, and more particularly, to a method of transmitting packet data including additional information.

The wireless Internet backbone network establishes a packet network in an existing mobile telephone network to provide a wireless data service including wireless internet to mobile mobile communication terminals. The packet network is composed of a packet data service node for setting the environment for providing a data service and a packet transmission network for packet transmission between the data network. The packet network for providing wireless data service can be divided into UMTS standardized by 3GPP, a European-based standardization organization, and CDMA2000 standardized by 3GPP2, a North American-based standardization organization.

CDMA2000 1x is an evolution of the second generation of services, offering improved data rates and a variety of services. In particular, the packet data can be transmitted at a speed of 144Kbps, and it supports the dormant state to efficiently use the traffic channel of the radio section. In addition, CDMA2000 1x has been improved to CDMA2000 1x EV-DO and CDMA2000 1x EV-DV to provide improved data services.

In a wireless data service, packet data is transmitted from a packet data service node to a mobile communication terminal through a packet controller, and is generally transmitted by encapsulating in a generic routing encapsulation (GRE) protocol. However, the header of the GRE packet may not contain any information other than the predefined information required for data transmission. That is, it cannot contain information other than the information included in the field defined in the GRE header format specification, and thus other information that can be referred to or utilized in packet processing among nodes interworking for data service, such as information on quality of service, can be included. There is a disadvantage that cannot be represented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages, and includes an additional information indicator indicating that additional information is included in the GRE packet header when transmitting data from the packet data service node to the packet controller, and adding useful information to the GRE header. There is a technical problem to provide an additional information method that can improve the packet data processing performance by including the transmitted information.

The present invention for achieving the above-described technical problem is connected between a packet controller for performing a wireless section communication for providing a packet data service to the mobile communication terminal, the packet controller and the IP network and the mobile communication terminal through the packet controller A mobile communication system including a packet data service node operating as a network access server for providing a packet data service, the method comprising: transmitting packet data including additional information from the packet data service node to the mobile communication terminal. The packet data service node generates the packet data as a GRE packet, and includes the additional information identifier field in the GRE packet, activates the additional information identifier when the additional information is to be transmitted, and selects the desired additional information. In the GRE header It characterized in that the packets sent to the group controller.

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

1 is a diagram illustrating an example of a mobile communication system to which the present invention is applied.

As shown, the mobile communication system for providing a wireless Internet service to the mobile communication terminal 10 controls the base station (BTS, 20) performing wireless section communication with the mobile communication terminal 10, a plurality of base stations and voice A base station controller (BSC) 22 that supports communication and data communication and performs a function of connecting a mobile communication system and a mobile communication terminal, and an exchanger connected to one or more base station controllers 22 to perform a call exchange (MSC) 24 ), A type of database that stores personal information, location information, additional service information, etc. of a user of the mobile communication terminal 10, and interacts with an exchange 24 and a visitor location register (not shown) to process and add voice calls. The home location register (HLR) 26 performs functions such as user authentication related to the service and controls the service.

In addition, the mobile communication system according to the present invention operates as a base station controller for providing a packet data service, thereby providing a packet controller (PCF) 28 for exchanging control signals and traffic information for the packet data service, and an IP through a gateway. A packet data service node (PDSN) 30 connected to the network 36 and operating as a network access server that provides packet data services to the mobile communication terminal 10 through the packet controller 28, user authentication, authority and billing information. Authentication apparatus (AAA) 32 performing the collection function, and a home agent (HA) 34 for managing the mobility of the mobile communication terminal (10).

In the above, the packet controller 28 further performs a buffering function and a state management function of the mobile communication terminal until the packet data transferred from the packet data service node 30 is transmitted wirelessly. The interface for signaling A11 and user traffic A10 between the packet controller 28 and the packet data service node 30 is called an R-P interface. The R-P interface uses a mobile IP protocol for signaling between the packet controller 28 and the packet data service node 30, and uses GRE (Generic Routing Encapsulation) for the transmission of user traffic.

FIG. 2 is a diagram for describing a configuration of a user plane data protocol stack between a packet data service node and a packet controller shown in FIG. 1.

As shown, the packet data service node 30 has a protocol stack for communicating with the IP network 36 and a protocol stack for communicating with the packet controller 28. In both cases, coding, modulation, etc. It has a link layer for performing functions such as error correction, flow control, synchronization, etc. for accurate physical message transmission and message transmission. In addition, the protocol stack for communication with the packet controller 28 further includes an IP layer and a GRE layer specifying the transmission destination of the data.

On the other hand, the packet controller 28 is a MAC (Medium Access) corresponding to the GRE layer from the Air-Link corresponding to the physical layer of the protocol used by the packet data service node 30 and the link layer above the physical layer. A control layer and a link access control (LAC) layer are included, and the MAC layer performs radio resource allocation for data processing, and the LAC layer performs functions such as establishing and maintaining a logical link.

In such a protocol stack structure, the packet data service node 30 encapsulates user data packets in a GRE and sends them to the packet controller 28, which is included in the Requests For Command (RFC) 2784 of the International Engineering Task Force (IETF). In the GRE standard, the GRE header is defined as shown in FIG. 3.

3 is a diagram for explaining a configuration of a general GRE header.

As shown, the GRE header may include a 2-byte flag field, a protocol type field, and additionally include a checksum field, a reserved field, and the like used to determine the accuracy of the data.

In detail, a flag field consisting of two bytes, the 0th bit of the first byte is predefined (C; Checksum), and is set to an appropriate value according to the type of additionally included field, starting from the first bit of the first byte. Up to the fourth bit of the second byte is unused as a reserved bit and is generally set to '0' and transmitted. Also, the fifth to seventh bits of the second byte contain version information and are generally set to '0' and transmitted.

As described above, 12 bits of the flag bits of the GRE header are reserved bits, and when one of the 12 bits of reserved bits is selected and used as an indicator indicating that additional information is included, the packet controller is determined from the packet data service node. Through this, it is possible to further improve data processing performance when transmitting packet data to the mobile communication terminal.

4 is a view for explaining the configuration of a GRE header extended by the present invention.

4 illustrates a case in which an additional information indicator T is included in any one of the reserved bits of the flag field included in the GRE header (0th bit of the second byte). When the additional information indicator T is set to '1', it indicates that additional additional information (TLV Attributes) is included in the GRE header. For example, if T is 1 and C in the flag is 1, it means that a checksum field and a header length field are included. Here, the header length field is 2 bytes long and indicates the total length of the GRE header, that is, a length including a flag field, a checksum field, a header length field, and all attribute fields.

The format of the attribute field (TLV attribute) is shown in FIG. 5.

FIG. 5 is a diagram for describing a detailed configuration of the TLV attribute field shown in FIG. 4.

As shown, the attribute field includes a type field of 1 byte, a length of additional information length field of 1 byte, and a value field of 2 bytes. The type field means the data type of the additional information, the additional information length field indicates the total length of the additional information, and the content field contains the actual additional information and the length is 0 bytes or a length sufficient to display the additional information. And the length is determined by the type field and the additional information length field.

As such, when the additional information indicator is included in one of the preliminary fields of the flag field, and the additional information indicator is to be included, information useful for data processing may be included in the GRE header.

In FIG. 3, the format of the GRE header defined in RFC2784 is shown. As shown, this format includes a key field used to identify each traffic in the tunnel, and a sequence of packet data ( Sequence Number) field, Timestamp field indicating data transmission time, Routing field indicating data transmission path and the like are not included. However, if the additional information indicator according to the present invention is applied, all of the information can be included in the GRE header as desired.

For example, in order to include a key field and an order field in a GRE header, each data may be defined as shown in [Table 1].

type field Attribute length One Key 4 2 Sequence 4

When the key field and the order field are defined as shown in [Table 1] and included in the GRE header, the GRE header format is shown in FIG. 6.

6 is a view for explaining the configuration of the GRE header according to an embodiment of the present invention.

As shown, the additional information indicator T field is set to '1' and activated, and the checksum indicator of the flag field is also activated to '1'. Accordingly, the GRE header of this embodiment includes a checksum field of 2 bytes. In the present embodiment, the first additional information represents a key value, and the second additional information represents an order value. First, T1, L1, and V1 are additional information representing a key value, T1 represents a data type of a key value, L1 represents a total length (6 bytes) of first additional information, and V1 includes an actual key value. Next, T2 indicates the data type of the order value, L2 indicates the total length (6 bytes) of the second additional information, and the actual order value is recorded in V2.

In this way, the GRE header of this embodiment is 20 bytes in total including the header length field (Length), and this information is recorded in the header length field.

In the present invention, one of the preliminary fields of the flag field is used as an additional information indicator to include additional information in the GRE header, and it can be seen that information useful for data transmission and processing can be included by using the additional information indicator. .

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, according to the present invention, when the additional information identifier is included in the GRE header and the information other than the information previously defined in the GRE header is activated, the additional information identifier is activated and the desired additional information is added to the GRE header. By additionally transmitting, it is possible to represent other information that can be referred to or utilized in packet processing among nodes interworking for data service, thereby improving data processing performance.

1 is a diagram showing an example of a configuration of a mobile communication system to which the present invention is applied;

FIG. 2 is a diagram for explaining the configuration of a user plane data protocol stack between a packet data service node and a packet controller shown in FIG. 1;

3 is a view for explaining the configuration of a general GRE header,

4 is a view for explaining the configuration of a GRE header extended by the present invention,

5 is a view for explaining the detailed configuration of the TLV attribute field shown in FIG.

6 is a view for explaining the configuration of the GRE header according to an embodiment of the present invention.

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

10: mobile communication terminal 20: base station

22 base station controller 24 switchboard

26: home location register 28: packet controller

30: packet data service node 32: authentication center

34: home agent 36: IP network

Claims (4)

A network access server for providing a packet data service to the mobile communication terminal through the packet controller connected between a packet controller for performing wireless section communication for providing a packet data service to a mobile communication terminal, the packet controller and an IP network. A mobile communication system including a packet data service node operating as a method, the method comprising: transmitting packet data including additional information from the packet data service node to the mobile communication terminal. The packet data service node generates the packet data as a GRE packet, and includes the additional information identifier field in the GRE packet. When the additional information is to be transmitted, the additional information identifier is activated, and the desired additional information is included in the GRE header and transmitted to the packet controller. The method of claim 1, The header of the GRE packet includes a flag field of 2 bytes and a protocol type field of 2 bytes, the flag field includes a 12-bit reserved field, The additional information identifier is displayed by using any one of the 12-bit preliminary field. The method of claim 1, The additional information includes an additional information data type field, an additional information length field, and an additional information content field. The method of claim 3, wherein The length of the data type field is 1 byte, the additional information length field is 1 byte, and the additional information content field is 0 to 4 bytes.