KR100850512B1 - Mobile IPv6 packets transmission method of Wireless Communications - Google Patents

Abstract

The present invention relates to a mobile IPv6 packet transmission method of wireless communication. More specifically, the present invention relates to a method for improving the efficiency of radio resource usage between a base station (Access Point) and a terminal when providing a mobile IPv6 based Internet packet service in a user terminal used in wireless communication.

In order to process the IP packet of the terminal in the base station, call processing for negotiation between the terminal and the base station must be preceded. That is, when routing a packet using mobile IPv6 in wireless communication, the mobile station negotiates the processing of the mobile IPv6 packet when the terminal accesses the wireless section of the base station (AP) and performs an initial access process. Therefore, the base station decapsulates and transmits the encapsulated IPv6 packets to the terminal in case of downlink received from the counterpart node to the terminal, and in case of uplink transmitted to the counterpart node, the base station receives IPv6 packets from the terminal. By encapsulating and transmitting, it is possible to efficiently support radio resources.

Encapsulation, Unencapsulation, IPv6, Uplink, Downlink

Description

Mobile IPv6 packets transmission method of wireless communications

1A is a block diagram of an encapsulated IPv6 packet transmitted to a user terminal from a counterpart node of general wireless communication.

1B is a block diagram of an IPv6 packet transmitted from a counterpart node to a user terminal after binding of general wireless communication is performed.

2 is a flowchart illustrating a method of transmitting a mobile IPv6 packet in a general wireless communication.

3 is a flowchart illustrating a method for transmitting a mobile IPv6 packet for which a terminal requests a capsule processing function according to an embodiment of the present invention.

4 is a flowchart illustrating a method for transmitting a mobile IPv6 packet in which a base station accepts a capsule processing function according to an embodiment of the present invention.

5 is a flowchart illustrating a method for the base station to decapsulate a packet in the downlink according to an embodiment of the present invention.

 6 is a flowchart illustrating a method of encapsulating packets by a base station in the uplink according to an embodiment of the present invention.

The present invention relates to a mobile IPv6 packet transmission method of wireless communication. More specifically, the present invention relates to a method for improving the efficiency of radio resource use between a base station (Access Point) and a terminal when providing a mobile IPv6 based Internet packet service in a user terminal used in wireless communication.

As next-generation wired and wireless communication networks are evolving into IP-based networks, and new IP-based access networks such as wireless LAN, portable Internet, and Mobile Broadband Wireless Access (MBWA) have emerged one after another, the importance of mobility management standard technology at the IP layer has become important. It is constantly growing.

FIG. 1A is a block diagram of an encapsulated IPv6 packet transmitted from a counterpart node to a user terminal in general wireless communication.

The most representative standard technology of IP-based mobility management is mobile IP. Mobile IP is a technology for mobile terminals using the Internet protocol. When a mobile terminal (or mobile node) accesses a remote network from outside, the home agent receives an address obtained from the current network, that is, a care of address (CoA). When registered, a Home Agent (HA) of a home network uses data already in IPv6 form as the source and destination addresses of the home agent address and the new address CoA of the terminal in order to transmit data to a terminal in a remote network. Send additional IPv6 headers. This is called IPinIP and is called encapsulation (hereinafter referred to as "encapsulation" for convenience).

The foreign agent (FA) decomposes the data received from the home agent and transmits it to the terminal. This decomposition process is referred to as decapsulation or decapsulation (hereinafter referred to as "uncapsulation" for convenience). This process was proposed by the IETF as an RFC. This mobile IP standard consists of two parts, Mobile IP Agents and Mobile Nodes. The Mobile Encapsulation IP Agent is responsible for virtual routing services that route packets to registered mobile terminals (mobile nodes). do. In this case, a method for routing a packet to a mobile terminal whose access point has changed is called tunneling and provides a continuous service regardless of whether the terminal moves.

Meanwhile, the mobile IPv4 proposed in the existing IPv4 environment is newly proposed as mobile IPv6 to operate in the IPv6 network. Mobile IPv6 has significant differences compared to the existing mobile IPv4 in terms of operation. For example, when a terminal moves to a new external network other than the home network, there is no external agent (FA), which is a major participant in mobile IP operation, and only a simple router exists in the external network. The router grants Care of Address (CoA) to a new terminal in its area, but does not participate in mobile IP routing such as tunneling. Therefore, the mobile terminal directly plays the role of the external agent (FA) in the past. That is, as the terminal participates in routing, tunneling, encapsulation, and decapsulation functions are performed. Therefore, the encapsulated packets are directly transferred to the terminal by moving the wireless section, and the terminal performs decapsulation, that is, decapsulation, to process the packet. That is, the home agent HA and the terminal and the correspondent node directly participate in tunneling, which has been handled between routers. The main operation of such tunneling is encapsulation and decapsulation of the terminal as described above.

1B is a block diagram of an IPv6 packet transmitted from a counterpart node to a user terminal after a binding update is performed in general wireless communication.

The UE notifies the counterpart node and the home agent (HA) that have communicated with the UE that their location has moved. This process is called a binding update. After performing this series of signaling procedures, traffic between the UE and the counterpart node is directly transmitted using the Type 2 Routing Header of IPv6 without passing through the home agent (HA). The signaling procedure in which the binding update is performed in this radio period will be described with reference to FIG. 2.

2 is a flowchart illustrating a method of transmitting a mobile IPv6 packet in a general wireless communication.

Referring to FIG. 2, an initial connection of mobile IPv6 is made in a wireless communication service, and an IPv6 packet encapsulated and tunneled by a home agent HA is delivered to a terminal. Initially, when registration is performed between the user terminal and the base station, IP address allocation is performed by performing initial mobile IPv6 registration through a home agent (HA) in the home network (HA). Accordingly, the user terminal acquires a home address (HoA) and a care of address (CoA) through the initial registration procedure (202). Next, in the process of transmitting traffic from the partner node to the user terminal, an IPv6 packet is sent to the home network in which the home agent HA is located (203). At this time, the home agent (HA) intercepts the IPv6 packet sent from the counterpart node to the user terminal and sends the care-of-address (CoA) of the user terminal to the destination address and the home agent (HA) to deliver to the user terminal located in the other network. An IPv6 header having an address as a source address is added and encapsulated and tunneled (204). The IPv6 packet encapsulated in the home agent is delivered to the terminal through steps 205 and 206. Next, the user terminal sends information indicating the new location of the terminal directly to the partner node through a binding update procedure (207), after which the partner node stores the binding update information and uses the updated binding information from now on. The data is delivered directly to the user terminal without passing through the agent HA (208). Such a function that can communicate without going through the home agent (HA) suggests a separate protocol for path optimization without the mobile IPv4 in the basic specification, but the mobile IPv6 is included in the basic specification. Therefore, traffic delay problems such as triangle routing, which may occur when all packets destined for the mobile terminal had to pass through the home agent, do not occur. It will communicate directly with the node. Therefore, since the terminal directly decomposes and configures the tunneled packets and does not go through a broker such as an external agent (FA), the data encapsulated by IPinIP is transmitted to the user terminal via the base station as shown in FIG. 1A. Therefore, in a typical IPv6 traffic packet, the radio section is moved in the form of a packet packed with an IPv6 header, and the packet is transmitted in the form of a capsule in which 40 bytes are added to each packet, which wastes radio resources.

Accordingly, the present invention is to solve the above problems, when routing packets using mobile IPv6 in wireless communication, the base station that exists between the terminal and the router and is responsible for the transmission of the radio section encapsulation of IPv6 packets and Decapsulation is performed to increase the resource utilization rate of the wireless section.

The present invention for solving the above problems, a method for improving the efficiency of the use of radio resources between the base station (Access Point) and the terminal when providing a mobile IPv6-based Internet packet service in the user terminal used in wireless communication It is about.

In the wireless communication, in order to encapsulate the IPv6 packet at the base station, call processing for negotiation between the terminal and the base station must be preceded. In other words, when routing a packet using mobile IPv6 in wireless communication, the mobile station negotiates the capsule processing function of the mobile IPv6 packet when the terminal accesses the wireless section of the base station (AP) and performs an initial access process.

In the method of the base station of the wireless communication according to the embodiment of the present invention to negotiate the capsule processing function of the mobile IP packet with the terminal,

a) receiving an encapsulation function request message of a mobile IP packet from a terminal; b) checking the received capsule processing function request message to obtain address information of the terminal; c) determining whether encapsulation is possible for the mobile IP packet related to the terminal based on the obtained address information of the terminal; And d) transmitting a message including the determination result in step c to the terminal.

In addition, in a method for decapsulating a downlink packet in a base station transmitting a mobile IP packet of wireless communication according to an embodiment of the present invention,

a) receiving a packet transmitted to a terminal; b) checking the address of the packet and mapping it to a radio access CID (Connection ID) for the terminal; c) inspecting the configuration of the packet to determine whether to decapsulate; And d) if decapsulating the packet, performing the decapsulation of the packet.

In addition, in the encapsulation method in the uplink in the base station for transmitting a mobile IP packet of wireless communication according to an embodiment of the present invention,

a) receiving an IP packet from a terminal; b) checking the address of the packet and mapping it to a radio access CID (Connection ID) for the terminal; c) inspecting the configuration of the packet to determine whether to encapsulate; And d) performing encapsulation of the packet when the encapsulation is to be performed.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Now, a method of transmitting a mobile IPv6 packet in wireless communication according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As in the embodiment of the wireless communication of FIG. 2, the prior art uses the IPinIP encapsulated IPv6 packets through the home agent 140 in steps 202 to 206, before the binding update is made. 120, it is transmitted to the user terminal 110 via a wireless section. As described above, the encapsulated packets are directly decapsulated by the user terminal 110, and conversely, when the packets are transmitted to the home agent 140 and the counterpart node 150, the packets are encapsulated.

The present invention has a feature that the base station 120 increases the transmission efficiency of the radio section between the base station 120 and the user terminal 110 by encapsulating and decapsulating the IPv6 packet. That is, in the case of the downlink in which the packet is received from the outside to the terminal, the base station decapsulates the packet and transmits the encapsulated packet to the terminal through the wireless section, and the user terminal 110 sends the home agent 140 and the counterpart node 150. In case of uplink transmitting a packet to a destination address, the base station encapsulates the packet received from the user terminal 110 and transmits the packet. Therefore, the base station needs to negotiate in advance between the user terminal 110 and the base station 120 to perform the function of encapsulating and decapsulating IPv6 packets. Therefore, the negotiation process for the base station to perform the capsule processing function will be described with reference to FIGS.

3 is a flowchart illustrating a method of transmitting a mobile IPv6 packet for which a terminal requests a capsule processing function according to an embodiment of the present invention.

Referring to Figure 3, the terminal shows a part of the process of starting the initialization in wireless communication. The terminal performs MAC initialization and is assigned an IP address of the terminal using a standard procedure of mobile IPv6 (S305). This procedure and the process of acquiring the IP address depending on the procedure may vary depending on the implementation, but in this process, the home agent address (HAA), the home address of the terminal (HoA), and the care of the home agent (HA) Obtain the address CoA.

On the other hand, the terminal is a process belonging to the initialization can set the wireless MAC connection with the base station through the DSA (Dynamic Service Add) message transmission in accordance with the IEEE 802.16 standard and can change the settings of the connection through the DSC (Dynamic Service Change) message have. The present invention adds by defining a message exchange procedure for requesting and releasing a MIPv6 capsule processing function using the option field of the DSA message and the address information obtained in step S305. Therefore, the terminal transmits DSA_REQ + {MIPv6 capsule processing request option} to the base station (S310). That is, the terminal further requests encapsulation and decapsulation support for the IPv6 packet, and receives the DSA_RSP + {MIPv6 capsule processing acceptance} from the base station to complete the negotiation process (S315).

Next, the terminal divides the downlink and uplink in the state of completing the negotiation process of the base station (S320).

First, the downlink (S330), the terminal determines whether to accept the MIPv6 capsule processing received from the base station (S331), when accepting, the base station receives the packets decapsulated processing (S332), if not accepted You will receive IPv6 packets in encapsulation.

On the other hand, the uplink (S340), the terminal determines whether to accept the MIPv6 capsule processing received from the base station (S341), when accepting, transmits an unencapsulated packet sent to the final destination to the base station (S342), do not accept If not, the packet is encapsulated and transmitted to the base station.

4 is a flowchart illustrating a method of transmitting a mobile IPv6 packet in which a base station accepts a capsule processing function according to an embodiment of the present invention.

Referring to FIG. 4, the base station corresponding to the terminal of FIG. 3 illustrates a partial process of starting initialization in wireless communication. In step S310 of FIG. 3, when the terminal serving the base station transmits the DSA_REQ + {MIPv6 capsule processing function option} message, the base station receives the message (S405). Accordingly, the base station acquires the home agent address (HAA), the unique address HoA (Home of Address) and the care of address (CoA) of the terminal from the data information received in the above process (S410), and the DSA_RSP + {MIPv6 capsule processing to the terminal. By transmitting the function acceptance} to complete the negotiation process with the terminal (S415).

Next, as shown in FIG. 3, the base station divides the downlink and the uplink while completing the negotiation process with the terminal (S420).

First, the downlink (S430), depending on whether the base station accepts the MIPv6 capsule processing transmitted to the terminal (S431), if accepted, the base station performs decapsulation of the IPv6 packets encapsulated in IPinIP form on behalf of the terminal (S432). ), And transmits the decapsulated IPv6 packet to the terminal (S433). On the other hand, in case of not accepting, the IPv6 packet of the encapsulation state is transmitted to the terminal without additional processing (S434).

On the other hand, the uplink (S340), the terminal determines whether to accept the MIPv6 capsule processing received from the base station (S441), when accepting, receives the unencapsulated packet from the terminal to perform the encapsulation in the form of IPinIP (S442) In operation S443, the encapsulated IPv6 packet is transmitted to the final destination. On the other hand, if not accepted, the packet is encapsulated and transmitted to the final destination without additional processing (S444). 3 and 4, the UE requests DSC_REQ and the BS responds with DSC_RSP when necessary or when packets that do not need to be decapsulated are processed.

As described above, in FIG. 3, the terminal negotiates a capsule processing function for the base station, and in FIG. 4, the base station negotiates with the terminal through the process of accepting the capsule processing function. That is, since the call processing for negotiation is preceded by the terminal and the base station, the base station performs encapsulation on behalf of the terminal, and the size of IP packets transmitted in the wireless section is reduced, so that the use of resources can be efficiently operated.

Next, a method of encapsulating and accepting packet processing by the base station will be described by dividing the downlink of FIG. 5 and the uplink of FIG. 6.

First, FIG. 5 is a flowchart illustrating a method in which a base station decapsulates a packet in the downlink according to an embodiment of the present invention.

Referring to Figure 5, the base station receives the encapsulated IP packet transmitted from the router to the terminal (S505). Then, the base station checks the address of the IPv6 packet as part of the packet classification operation, checks the source and destination address (S510), and maps it to the promised CID (Connection ID) (S515). That is, the address of the packet is examined and mapped to the radio access CID for the corresponding terminal. Therefore, it is checked whether the corresponding CID supports decapsulation, that is, encapsulation (S520). In this case, if the packet is not supported for uncapsulation, the packet is queued without other processing. If the packet is uncapsulated, the IPv6 encapsulated packet is inspected and the source address is HAA (Home Agent Address). Checks whether a packet is configured as IPv6 header + payload}. In addition, there should be no Type2 Routing Option such as the binding updated IPv6 packet of FIG. 1B (S525). If the 'S525' condition is not satisfied, it waits for transmission without any other processing, and if satisfied, the base station decapsulates the IPv6 encapsulated packet (S530). At this time, the home agent address (HAA) and care-of-address (CoA) are extracted from the header information of the packet, and records are made and stored (S540). The address information extracted in the downlink process and stored in the record is used when the base station performs encapsulation on behalf of the terminal during uplink. In addition, packets decapsulated by the above-described process are in a waiting state for transmission and then are sent to the wireless section.

Next, FIG. 6 is a flowchart illustrating a method of encapsulating packets by a base station in the uplink according to an embodiment of the present invention.

Referring to FIG. 6, a method of encapsulating a base station for uplink data transmission transmitted from a terminal to a base station after performing the encapsulation request and approval procedure between the terminal and the base station described in FIGS. 2 and 3 is illustrated. .

When the base station receives the IP packet transmitted to the counterpart node from the terminal serving within the utilization range (S605), the base station examines the address of the IPv6 packet and acquires a destination address and a source address (S610). Next, mapping to the promised CID (615), it is determined whether the CID supports encapsulation (S620). In addition, it is determined whether the IPv6 header received from the terminal is in the form of {Source Address = Home of Address (Terminal Unique Address), Destination Address = CN Address (relative node address)} (S625). Recall the stored address information (HAA, CoA) (S630). Therefore, the base station encapsulates the header of the packet received from the terminal by adding the address of the relative node, which is the destination address value, and the IPv6 header, which is the following additional address information, to the unique address of the terminal, which is the source address value (S640).

{Source address = Care of Address, Destination Address = Home Aagent Address}

In this way, the base station encapsulates the IPv6 packet on the upload transmitted from the terminal to the counterpart node, and the encapsulated Pv6 packet is transmitted to the counterpart node while in the waiting state.

In the present invention, since the present invention listens to an embodiment of a content of negotiating an encapsulation portion between a base station and a terminal using an option field that is not currently used, such as DSA and DSC, in an initial access process based on wireless communication, The details of the option fields of DSA and DSC are omitted. These messages may provide fields that can be used by the manufacturer in addition to the current option fields.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

When routing a packet using mobile IPv6 of wireless communication, when a terminal accesses a wireless section of a base station (AP) and performs an initial access process, the mobile IPv6 packet can be negotiated.

Therefore, in case of the downlink received by the base station from the counterpart node to the terminal, the base station decapsulates the encapsulated IPv6 packets and transmits them to the terminal. In the case of uplink transmission to the other node, an IPv6 packet not encapsulated by the terminal is transmitted to the base station, and the base station encapsulates and transmits the received IPv6 packet, thereby improving the efficiency of radio resource utilization between the base station and the terminal. .

Claims (21)

In the method of the terminal of the wireless communication to negotiate the capsule processing function of the mobile IP packet with the base station, a) performing initialization of the terminal and receiving an IP address; b) sending an encapsulation function request message of the mobile IP packet to the base station; And c) receiving an encapsulation function acceptance message of the mobile IP packet from the base station, where the encapsulation function acceptance message includes encapsulation capability in the base station; Negotiation method comprising a. The method of claim 1, In step a), And the terminal obtains a home agent address, a unique address of the terminal, and a care of address (CoA). The method of claim 2, And transmitting, by the terminal, a message for requesting an encapsulation function for encapsulating or releasing a packet using an option field of a dynamic service add (DSA) message and the address information obtained in step a). The method according to claim 1 or 3, The capsule processing function request message is transmitted to the base station by including an IPv6 capsule processing request option field in a DSA request message (DSA_REQ). The method of claim 1, C), And an IPv6 encapsulation accept field included in a DSA response message (DSA_RSP) from the base station. The method of claim 1, After step c), And receiving a packet decapsulated from the base station with respect to a packet of a downlink when the capsule processing function acceptance message is received from the base station. The method of claim 1, After step c), And upon receiving an encapsulation function acceptance message from the base station, transmitting an unencapsulated packet to an uplink packet to the base station. In the method for the base station of the wireless communication to negotiate the capsule processing function of the mobile IP packet with the terminal, a) receiving an encapsulation function request message of a mobile IP packet from a terminal; b) checking the received capsule processing function request message to obtain address information of the terminal; c) determining whether encapsulation is possible for the mobile IP packet related to the terminal based on the obtained address information of the terminal; And d) transmitting a message including the determination result in step c to the terminal; Negotiation method comprising a. The method of claim 8, B), b-1) receiving a capsule processing request option field included in a DSA request message (DSA_REQ) from the terminal; And b-2) obtaining a home agent address of the terminal, a unique address of the terminal, and a care-of-address (CoA) from the received data information. The method of claim 8, Step d), And transmitting an IPv6 encapsulation accept field included in a DSA response message (DSA_RSP) to the terminal. The method of claim 8, After step d), And when it is determined that the mobile IP packet is encapsulated, the base station decapsulates the encapsulated packet and transmits the encapsulated packet to the terminal when the downlink becomes available. The method of claim 8, After step c), When the uplink from the terminal, the packet encapsulation (Encapsulation) characterized in that for transmitting to the destination. A method for decapsulating downlink packets at a base station transmitting mobile IP packets of wireless communication, a) receiving a packet transmitted to a terminal; b) checking the address of the packet and mapping it to a radio access CID (Connection ID) for the terminal; c) inspecting the configuration of the packet to determine whether to decapsulate; And d) if the object is to be decapsulated, performing the decapsulation of the packet Encapsulation method comprising a. The method of claim 13, C), And determining whether the wireless access CID mapped in step b) is for supporting capsule release in the downlink. The method of claim 13, C), If the source address of the packet is HAA (Home Agent Address), and is configured in the form of encapsulated {IPv6 header {IPv6 header + payload}}, there is no Type 2 Routing Option. Capsule release method, characterized in that judged as the target. The method of claim 13, In step d), The capsule release method of extracting and storing a home agent address (HAA) and a care of address (CoA) from the header information of the packet in performing the capsule release of the terminal. In the encapsulation method on the uplink in the base station for transmitting a mobile IP packet of wireless communication, a) receiving an IP packet from a terminal; b) checking the address of the packet and mapping it to a radio access CID (Connection ID) for the terminal; c) inspecting the configuration of the packet to determine whether to encapsulate; And d) performing encapsulation of the packet if the target is to be encapsulated; Encapsulation method comprising a. delete delete delete delete

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