KR20030030744A - The method of seamless packet sequence control to support for mobility in mobile network - Google Patents

Abstract

PURPOSE: A continuous packet sequence control method for supporting a mobility in a radio communication network is provided to reduce a data sequence change and a loss rate by applying a handoff sequence controlling when a mobile station is moved into a different PDSN(Packet Data Serving Node) area. CONSTITUTION: A mobile station reports its position information to a PDSN(501), and the PDSN stores the position information. The PDSN estimates a movement direction of the mobile center and its rate by using the position information, area information having location information of an RN(Radio Network) and movement environment information of the PDSN(502). The PDSN constructs RNs on the estimated movement path of the mobile center as a multicast group by using the estimated movement direction and rate of the mobile center(503). The PDSN records an estimated handoff time of each member RN and informs each RN accordingly(504). The PDSN transfers a packet to be transmitted to the mobile station to the member RNs of the multicast group and an RN in which the mobile station is currently positioned transfers the packet to the mobile station. The member RNs respectively store only packets after the handoff-estimated time(505). The mobile center is moved into an adjacent RN and informs the RN of the number of the last packet the mobile station itself has received.

Description

The method of seamless packet sequence control to support for mobility in mobile network}

The present invention relates to a continuous packet sequence control method for mobility support in a wireless communication network, and a computer-readable recording medium recording a program for realizing the method. More specifically, 3GPP2 (Third Generation Partnership Project 2) and the like. When handoff occurs in the same next-generation mobile communication network, continuous handoff for mobility support is provided so that continuous service is provided without data reordering or data loss from another mobile station (MS) or correspondent node (CN). And a computer readable recording medium having recorded thereon a program for realizing the method.

Currently, handoff occurs in 3GPP2 between packet data serving nodes (PDSNs) or between radio networks (RNs) in one PDSN, and mobility is expressed between macro mobility and RN between PDSNs. It is divided into micro mobility of liver. When the mobile station receives data from another mobile station or CN through PDSN and RN, if the mobile station moves between PDSNs or RNs, location transparency is provided, loss of data transmitted and received, packet delivery in order Continuous connection service, ie, continuous handoff must be provided.

To this end, 3GPP2 provides mobility by applying Mobile IP (MIP), and Handoff Aware Wireless Access Internet Infrastructure (HAWAII) and Cellular IP (Cellular IP) methods are proposed to support micro mobility. However, the above mentioned methods are not sufficient to provide a continuous handoff, such as delaying a handoff when the packet is lost or the order of the packets is changed. The above is described with the drawings as follows.

FIG. 2A illustrates an example of loss and order change of Down Stream data packets according to the prior art. FIG.

As shown in FIG. 2A, when a handoff occurs from 0ld PDSN 202 to New PDSN 204 while data is downstream, a problem of reordering and loss of data packets may occur. Among the data packets 1, 2, 3, 4, and 5 sent from the home agent (HA), the mobile station receives packet 1, and the remaining 2, 3 data packets are 0ld PDSN (202). If the handoff occurs while the data packets 4 and 5 have not been sent yet, the home agent 208 transmits the remaining data packets 4 and 5 to the New PDSN 209. In this case, data packets 2 and 3, which were transmitted to the 0ld PDSN 202, are not transmitted to the mobile station through the Old RN 201, resulting in packet loss.

2B is a view illustrating an example of order change of an upstream packet according to the prior art.

For upstream, as shown in FIG. 2B, a data packet 1 is forwarded to the home agent 203 and a 2 or 3 time to 0ld PDSN 202 before a handoff occurs from 0ld PDSN 202 to NewPDSN 204. When a handoff occurs in a state where a data packet is transmitted, data packets 4 and 5 are transmitted to the New PDSN 204 through the New RN 205. At this time, when traffic conditions of 0ld PDSN 202 are congested, a case where data packets 4 and 5 of New PDSN 204 arrive at home agent 203 before data packets 2 and 3 may occur.

In addition, when the mobile station receives data from the Old RN 201 and moves to the New RN 205 and a handoff occurs, the mobile station should receive data from the New RN 205 starting immediately after data received from the Old RN 201. However, since the New RN 205 does not have the data, the New RN 205 notifies the 0ld PDSN 202 that a handoff has occurred and then receives a data packet from the Old PDSN 202 and transmits it to the mobile station. Done. Thus, in this case, service interruption occurs. In order to solve such a service, the New RN 205 should store data in advance. However, since the mobile station does not know which RN to move to, all of the neighboring RNs must store data beforehand so that endless handoff processing can be performed. However, this method can provide continuous handoff processing, but there is a buffer overhead problem with regard to data storage.

Therefore, many studies are being actively conducted, and one of them is the "patent handoff control method without packet loss in a wireless data mobile communication network", which is a patent registration number 301704 registered on June 27, 2001. The contents are briefly described as follows.

Prior art prior to the prior patent has been developed in several countries for packet-switched wireless communication network for providing packet data services such as Internet access in the IMT-2000 network. Here, an alternative method for supporting third generation mobile packet data service is moving to the IMT-2000 network in the form of "Overlay Network Service". Smooth handoff is proposed as a handoff scheme. However, smooth handoff of mobile IPs has some problems for use in mobile network environments such as IMT-2000. If the mobile network implements and uses the handoff according to the mobile IP's smooth handoff control method, the mobile station receiving the packet receives a care-of address from the agent in the newly entered area and informs the previous agent of the home agent. All packets between them will be lost until the location change registration is made. The lost packet is then retransmitted by retransmission request of higher protocol. In addition, frequent retransmission requests in the mobile network cause the other host (or mobile station) to reduce the size of the transmission window and reduce the efficiency of the network even though no actual data congestion occurs. Thus, the prior patent has a mobile packet hand with no loss of packets and guaranteed quality of service (QoS) with a plurality of COA through the two point-to-point protocol (PPP) connection at the same time when handoff to solve this problem Offer off.

However, although the prior patent is a packet handoff control method without packet loss in a wireless data mobile communication network, only a macro mobility control method for packet handoff between PDSNs is presented. In addition, the prior patent does not minimize the time taken during handoff and the way to minimize the capacity of the buffer.

Therefore, in the current technical field, mobility between RNs as well as between PDSNs should be considered, and a number of methods for minimizing buffer capacity and minimizing handoff time are required.

The present invention has been proposed to meet the above-described demands, and considers mobility between RNs as well as between PDSNs in a wireless communication network, and minimizes the time taken during handoff while reducing the overhead of the buffer. It is an object of the present invention to provide a method of controlling a packet sequence continuously for increased mobility support and a computer-readable recording medium storing a program for realizing the method.

1 is an exemplary configuration of a wireless communication network to which the present invention is applied.

Figure 2a is an illustration of the loss and reordering of Down Stream data packets according to the prior art.

2B is a view illustrating a sequence change of an upstream packet according to the prior art.

3 is a flowchart illustrating a method for controlling a downstream packet sequence for mobility support when a handoff occurs between PDSNs according to the present invention.

4 is a flowchart illustrating a method of controlling an upstream packet sequence for mobility support when a handoff occurs between PDSNs according to the present invention.

5 is a flowchart illustrating a method of controlling a packet sequence for mobility support when an inter-RN handoff occurs in a PDSN according to the present invention.

* Explanation of symbols for the main parts of the drawings

101: mobile station 102: RNx

103: PDSN

The present invention for achieving the above object,

In the method of controlling a packet sequence in a wireless communication network, a PDSN that newly manages a mobile station when a handoff occurs (hereinafter referred to as "New PDSN") is referred to a PDSN (hereinafter referred to as "Old PDSN") that has been in charge of the mobile station before the handoff occurs. Delivering a handoff occurrence message; Receiving a transfer response to the handoff occurrence message from an Old PDSN; A third step of downloading and storing data from an Old PDSN after responding to the handoff occurrence message; A fourth step of preferentially transmitting data downloaded and stored from the Old PDSN to an RN (Radio Network) after a handoff occurs; A fifth step of receiving a data transmission completion message from an Old PDSN after the data is completed from an Old PDSN; And a sixth step of receiving the transmission completion message, confirming that there is no more data downloaded from the old PDSN and storing the received data, and transmitting the data transmitted from the home agent to the RN after the handoff occurs. .

In addition, in the method of controlling a packet sequence in a wireless communication network, the method of the present invention includes a PDSN (hereinafter referred to as "New PDSN") that newly manages a mobile station when a handoff occurs, which is a PDSN that has been responsible for a mobile station before a handoff occurs (hereinafter, referred to as a PDSN). First handing the handoff occurrence message to the " Old PDSN " Receiving a transfer response for the handoff occurrence message from an Old PDSN; And receiving a message indicating that the old PDSN has completed data transmission from the old PDSN to the home agent after receiving the delivery response for the handoff occurrence message, is converted into a normal data transmission state and transmitted from the RN after the handoff occurrence and stored. And sending a packet to the home agent.

In addition, another method of the present invention is a packet sequence control method for RN mobility support in a wireless communication network, wherein a multicast group configuration in a PDSN is used to continuously process location information of a mobile station from a mobile station. Report stage 1; A second step of predicting a moving direction and a speed of the mobile station using the reported position information; A third step of joining the RNs on the expected path of the mobile station by using the predicted mobile station's movement direction and speed and configuring the multicast group; Informing the configured multicast group RNs of the estimated handoff time of the mobile station; And a fifth step of notifying the multicast group RNs of the estimated handoff time of the mobile station, and transmitting data packets after the estimated time to the newly controlled RN by the mobile station.

Meanwhile, the present invention relates to a network resource system equipped with a high-capacity processor for packet sequence control for mobility, wherein a PDSN that newly manages a mobile station when a handoff occurs (hereinafter referred to as "New PDSN") has jurisdiction over a mobile station before a handoff occurs. A first function of forwarding a handoff occurrence message to the PDSN (hereinafter referred to as "Old PDSN"); A second function of receiving a transfer response to the handoff occurrence message from an Old PDSN; A third function of downloading and storing data from an Old PDSN after responding to the handoff occurrence message; A fourth function of preferentially transmitting data downloaded and stored from the Old PDSN to an RN (Radio Network) after a handoff occurs; A fifth function of receiving a data transmission completion message from an Old PDSN after the data has been transmitted from an Old PDSN; And a program for realizing a sixth function of receiving the transmission completion message, confirming that there is no more data downloaded and stored from the Old PDSN, and transmitting the data transmitted from the home agent to the RN after the handoff occurs. Provides computer readable recording media.

The present invention also relates to a network resource system equipped with a high-capacity processor for packet sequence control for mobility, and that a PDSN (hereinafter referred to as "New PDSN") that newly manages a mobile station when a handoff occurs has jurisdiction over a mobile station before a handoff occurs. A first function of forwarding a handoff occurrence message to the PDSN (hereinafter referred to as "Old PDSN"); A second function of receiving a transfer response to the handoff occurrence message from an Old PDSN; And receiving a message indicating that the old PDSN has completed data transmission from the old PDSN to the home agent after receiving the delivery response for the handoff occurrence message, is converted into a normal data transmission state and transmitted from the RN after the handoff occurrence and stored. A computer readable recording medium having recorded thereon a program for realizing a third function of transmitting a packet to a home agent.

In addition, the present invention, in the network resource system having a large capacity processor for the control of the packet sequence for mobility, the multicast group in the PDSN to configure the continuous packet sequence control process, the first to receive the location information of the mobile station from the mobile station function; A second function of predicting a moving direction and a speed of a mobile station using the reported position information; A third function of joining the RNs on the expected path of the mobile station by using the predicted movement direction and speed of the mobile station and configuring the multicast group; A fourth function of notifying the configured multicast group RNs of an estimated handoff time of a mobile station; And a program for informing the multicast group RNs of the mobile station's estimated time of handoff and for realizing a fifth function of transmitting the data packets after the estimated time to the newly controlled RN. Provide recording media.

In the present invention, the mobile IP is used to support macro mobility of 3GPP2, and the PDSN performs a function of a foreign agent. In this case, the mobility supported when the mobile station moves from one PDSN to another PDSN is referred to as macro mobility, and the mobility supported when moving from one RN to another RN in a PDSN management area is referred to as micro mobility. It is called.

The present invention is a method for compensating for problems such as packet loss and reordering of packets, which may occur in macro mobility, and handoff for each case of down stream and up stream of a packet. The present invention relates to a continuous handoff algorithm between PDSNs using packet sequence control.

The present invention also relates to a continuous handoff algorithm based on a multicast group construction mechanism for micro-mobility support when the mobile station moves between RN and RN in PDSN.

The continuous handoff algorithm based on the multicast group mechanism calculates the movement direction and speed of the mobile station, configures RNs adjacent to the expected movement path of the mobile station into a multicast group, and minimizes the time of joining the multicast group. To increase the efficiency of the network.

In addition, in order to solve the problem of the buffer overhead of the existing multicast connection method, the PDSN transmits only data after the expected handoff time, and the RN also buffers only data after the expected handoff time.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration of a wireless communication network to which the present invention is applied.

As shown in FIG. 1, data from the home agent 104 to the mobile station 101 is transferred by the RNx 102 from the home agent 104 via the PDSN 103. Data from the mobile station 101 to the home agent 104 is also sent to the home agent 104 via the PDSN 103 via the RNx 102.

In FIG. 1, handoff occurs when the mobile station 101 moves between RNx 102 and RNx 102, or when moving between PDSN 103 and PDSN 103, where constant packet sequence control is required. Do.

3 is a flowchart illustrating a method for controlling a downstream packet sequence for mobility support when a PDSN handoff occurs according to the present invention.

Message names and buffer names used below are merely examples in applying the present invention.

Referring to FIG. 3, in the case of the downstream, when the handoff occurs, the control sequence of the packet sequence is determined. Before the handoff occurs, the Old PDSN stores the packets from the home agent in the “Down_Buffer” (301) and transmits them to the Old RN ( 302). If a handoff occurs, the New PDSN transfers a "Handoff_Gen" message indicating the handoff occurrence to the Old PDSN (303). Then, the Old PDSN receives the "Handoff_Gen" from the New PDSN and forwards this message back to the home agent (304), and forwards the "Handoff_Ack" message to the New PDSN indicating the reception of the handoff occurrence message (305).

Meanwhile, the home agent sends a packet to the Old PDSN until it receives the "Handoff_Gen". After receiving the "Handoff_Gen" message, the home agent transmits the "Handoff_DownEnd" message to the Old PDSN (306), and then transmits the next packet to the New PDSN (307), and the New PDSN stores data from the home agent in the Down_Buffer.

When the Old PDSN transmits a packet stored in Down_Buffer, which is a buffer for storing data from the home agent, to the New PDSN (308), the New PDSN stores it in Ho_Buffer. The New PDSN preferentially transmits the packet stored in the Ho_Buffer to the New RN (310).

Here, if the Old PDSN transmits all the packets in the Down_Buffer to the New PDSN, the Old PDSN is idle after transmitting the " Handoff_DownEnd " message to the New PDSN (309). In addition, the New PDSN checks the Ho_Buffer after receiving the "Handoff_DownEnd" message, and if there is no packet to send, terminates the handoff sequence control and transmits the packet stored in the Down_Buffer to the New RN in the normal data transmission state (311).

4 is a flowchart illustrating an upstream packet sequence control method for mobility support when a handoff occurs between PDSNs according to the present invention.

Referring to FIG. 4, the packet sequence control when a handoff occurs in the upstream is as follows. The Old PDSN stores the incoming packet from the Old RN (401) in the Up_Buffer and forwards it to the home agent (402).

If a handoff occurs, the New PDSN sends a "Handoff_Gen" message to the Old PDSN (403), and stores a packet from the New RN in Up_Buffer. When the Old PDSN receives the "Handoff_Gen" message from the New PDSN, the Old PDSN forwards this message back to the home agent (404), and forwards the "Handoff_Ack" message to the New PDSN (406). At this time, the New PDSN waits for a "Handoff_UpEnd" message from the Old PDSN while storing a packet from the New RN in the Up_Buffer.

The Old PDSN transmits the packets stored in the Up_Buffer to the home agent and terminates the packet sequence control by sending a "Handoff_UpEnd" message to the New PDSN and the home agent when the transmission is completed, and then becomes idle. .

In response, the New PDSN receives the "Handoff_UpEnd" message from the Old PDSN, terminates the packet sequence control, switches to a normal data transmission state, and transmits the packet stored in the Up_Buffer to the home agent (409).

FIG. 5 is a flowchart illustrating a method of controlling a packet sequence for mobility support when an RN handoff occurs in a PDSN according to the present invention. FIG. 5 illustrates a multicast scheme for supporting micro mobility when a mobile station moves between RNs and RNs in a PDSN. Represents a continuous handoff algorithm based on the group mechanism.

The mobile station is serviced by the PDSN and the RN managing the area where the mobile station exists. When the mobile station is moving the RN area, the mobile station can obtain the signal strength of the RN adjacent to the area where the mobile station exists. Suppose that is reported to, look at the handoff processing procedure of the multicast group-based handoff algorithm as follows.

First, the mobile station reports its location information to the PDSN (501), which stores the information about it. The location information consists of the number of the mobile station, the reporting time, and the signal strength of the adjacent RN (501). The PDSN predicts the movement direction and speed of the mobile station by using the location information received from the mobile station and the location information and the movement environment information including the arrangement information of the RN in the PDSN (502).

Next, the PDSN configures the RNs on the expected movement path of the mobile station into a multicast group by using the predicted movement direction and speed of the mobile station (503). At this time, the PDSN records the estimated handoff time of each member RN, and informs each RN of the RN. [0050] Next, the PDSN transmits a packet to be transmitted to the mobile station to the member RNs of the multicast group. The currently located RN sends a packet to the mobile station. The member RNs store only the packet after each handoff expected time (505).

The mobile station then moves to the adjacent RN, which informs the RN that it has moved the number of the last packet it received (506).

Finally, the new RN transmits the packet after the last number among the stored packets to the mobile station (507). Therefore, since the mobile station handles the handoff using a multicast connection, the mobile station can receive a continuous service of data from the RN, and the RN stores only packets after the expected handoff, thereby reducing the buffer overhead of the RN.

Looking at the process of predicting the expected handoff time in more detail as follows.

In the present invention, when the handoff occurs, the mobile station predicts an expected handoff time to provide a continuous handoff. To this end, the mobile station periodically informs the PDSN of the location information, which has factors such as signal strength and reporting time of adjacent RNs. The estimated handoff time is estimated by using the location information and the signal strength, which is a database having the actual measured signal strength of RN in the RN region, and predicting the location of the mobile station. Find the distance and then divide it by the speed of the mobile station to predict the expected handoff time. At this time, the mobile station speed prediction of the PDSN predicts the position according to the signal strength of the RN among the position information periodically reported by the mobile station by using the placement information, and divides the difference of the position according to the reporting time of the mobile station by the mobile station reporting time difference. Find the speed. Based on this, the PDSN transmits only data after the expected handoff time to the RN, and the RN also stores only data after its expected handoff time in the buffer.

Looking at the multicast group configuration process in more detail as follows.

Multicast group configuration means that the mobile station selects adjacent RNs based on the RN currently being serviced and sets them as a group. At this time, in order to provide continuous service to the mobile station, the size of the group and the overhead of the buffer of each member belonging to the group have a correlation.

In the present invention, when the PDSN determines a multicast group, the mobile station does not determine the group member from neighboring RNs of the RN currently being serviced, but the location information reported periodically by the mobile station and the placement information of the RNs of the PDSN. By predicting the moving direction and the speed of the mobile station by using the RN having the signal value with the largest RN signal strength among the expected paths of the mobile station as a moving object, the adjacent RNs are selected as a multicast group. At this time, it is intended to increase network efficiency and reduce overhead by determining, as members, up to RN having an appropriate signal strength value according to the predicted speed of the mobile station. In addition, the multicast group member join time is determined by subtracting the estimated handoff time from the sum of the time taken to select the RN members of the group and the time taken to join the member RNs.

In order to apply the proposed algorithm for continuous handoff based on multicast group configuration between RNs in PDSN, the following connection management information is maintained in PDSN, RN and mobile station.

First, the connection management information of the mobile station is as follows.

The mobile station establishes a connection with the fixed host (FH) through the RN and the PDSN to communicate. The connection related information maintained by the mobile station is a current PDSN number, a current RN number, information on a current connection, a connection number, and a number of a last received packet. This is described as follows.

The current RN number and the current PDSN number refer to the current position of the mobile station, and the PDSN number can be obtained using the RN number. In addition, since the mobile station can set up a call with several counterpart hosts, the mobile station maintains information on the connection currently connected by the connection number CONID and the last packet number. The last packet number field is the number of packets that the mobile station has successfully received from the RN. It is used to determine the packet that the next RN will send to the mobile station during handoff processing. It is also used to control the packet sequence between the RN and the mobile station to avoid duplication of data. .

Second, look at the connection management information of the RN as follows.

In the RN-managed area, the following information table is maintained in order to store the multicast packets in advance in preparation for the mobile station and the mobile station that are currently connected. The information in the connection information table is as follows. Connection information table, group number, mobile station number, connection number, estimated handoff time, and the like. Since the mobile stations existing in the area managed by the RN constitute respective multicast groups corresponding thereto, the RN configures group number, mobile station number, and connection number fields in order to maintain connection information of each mobile station. These are used to identify the mobile station's connection, and the Forecasted Handoff Time (FHOT) is used by the RN to store packets after the expected handoff time. This can determine the amount of data that the RN buffers.

Third, the connection management information of the PDSN is as follows.

The PDSN manages all mobile station connection information and multicast group information in the area managed by the PDSN, and maintains a location information table for tracking the location of the mobile station and a mobile environment table for estimating the expected path of the mobile station. Here, the mobile environment table includes a group number, an RN number, a mobile station number, an expected handoff time, a join request time, a location information table, and a mobile environment table.

The location information table includes the mobile station number, report time, RN number, and signal strength. The Position Information Table (PINFORTABLE) shows the signal strength (SS) of the adjacent RN reported periodically by the mobile station, the reported time (RT), and the number of the RN currently connected. RNID) and mobile station number (mobile station ID). In addition, information on an expected handoff time (FHOT) of each RN belonging to a group in a region managed by the PDSN is maintained by using a multicast group table (MGTABLE).

The mobile environment table includes a location of a mobile station, an estimated location, an estimated speed, and a group member list. A mobile environment table (MENVTABLE) is a static table that calculates a moving direction and a speed of a mobile station to multiply the mobile host. Used to form a cast group. The mobile environment table is constructed by the signal strength of the RNs measured at each location according to the actual mobile station's movement.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. Will be evident to those who have knowledge of

As described above, when the mobile station moves out of the current PDSN area to another PDSN area and a handoff occurs, handoff sequence control is applied to reduce the reordering and loss of data.

In addition, the present invention has an effect that by applying a multicast group configuration mechanism when the mobile station moves between RNs in the PDSN, the RN stores the data to be transmitted to the mobile station in the buffer in advance to support the continuous handoff when a handoff occurs .

In addition, the present invention has the effect of increasing the efficiency of the network by slowing the multicast group joining time as far as possible within the range that does not interfere with the continuous connection service.

In addition, the present invention suppresses unnecessary transmission since the PDSN transmits data only after the expected handoff time after the multicast join, and the RN also reduces the overhead of the buffer to store only the data after the expected handoff time. It has an effect.

Claims (16)

In the packet sequence control method in a wireless communication network, A PDSN which newly manages a mobile station when a handoff occurs (hereinafter referred to as "New PDSN"), a first step of delivering a handoff occurrence message to the PDSN (hereinafter referred to as "Old PDSN") that had jurisdiction over the mobile station before the handoff occurred; Receiving a transfer response for the handoff occurrence message from an Old PDSN; A third step of downloading and storing data from an Old PDSN after responding to the handoff occurrence message; A fourth step of preferentially transmitting data downloaded and stored from the Old PDSN to an RN (Radio Network) after a handoff occurs; A fifth step of receiving a data transmission completion message from an Old PDSN after the data is completed from an Old PDSN; And A sixth step of receiving the transmission completion message, confirming that there is no more data stored and downloaded from the Old PDSN, and transmitting data transmitted from the home agent to the RN after the handoff occurrence; Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method of claim 1, The continuous packet sequence control process in the Old PDSN, A seventh step of receiving a message informing of the handoff from the New PDSN when the handoff occurs, and delivering it to the home agent; An eighth step of receiving a response from the New PDSN to the handoff occurrence message; A ninth step of receiving a response to the handoff occurrence message from a home agent and receiving no more data from the home agent; And A tenth step of receiving a transfer response for the handoff occurrence message delivery from the New PDSN, transferring the data received from the home agent to the New PDSN, notifying that there is no more data to send, and entering an idle state; Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method according to claim 1 or 2, The continuous packet sequence control process in the home agent, An eleventh step of receiving a handoff occurrence message from an Old PDSN when a handoff occurs; And A twelfth step of delivering a response to the handoff occurrence message to an Old PDSN and delivering data coming from a home agent to a New PDSN; Endless packet sequence control method for mobility support in a wireless communication network comprising a. In the packet sequence control method in a wireless communication network, A PDSN (hereinafter referred to as "New PDSN") that newly manages a mobile station when a handoff occurs may include: a first step of delivering a handoff occurrence message to a PDSN (hereinafter referred to as "Old PDSN") that had jurisdiction over the mobile station before the handoff occurred; Receiving a transfer response for the handoff occurrence message from an Old PDSN; And After receiving the delivery response for the handoff occurrence message and receiving a message indicating that the old PDSN has completed the data transmission from the old PDSN to the home agent, the transfer to the normal data transmission state and transmitted from the RN after the handoff occurrence is stored Third step of sending a packet to a home agent Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method of claim 4, wherein The continuous packet sequence control process in the Old PDSN, Receiving a handoff occurrence message from the New PDSN when a handoff occurs and forwarding the handoff occurrence message to a home agent again; A fifth step of transmitting a response message to the handoff occurrence message received from the New PDSN; An Old PDSN transmitting the response message, transmitting the packets stored in the data buffer to the home agent; And Step 7 informing that the data transfer is completed to the New PDSN and the home agent after the transmission is completed. Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method of claim 5, The data buffer receives data from the RN before the handoff occurs, and receives data from the RN after the handoff occurs after the handoff occurs. . The method of claim 4 The continuous packet sequence control process in the home agent, When receiving data from the Old PDSN, when the handoff occurs, it receives the handoff occurrence message from the Old PDSN and receives the data sent by the mobile station from the Old PDSN data buffer until a message indicating that the data transmission from the Old PDSN is completed. Continuous packet sequence control method for mobility support in a wireless communication network, characterized in that. A packet sequence control method for supporting mobility between RNs in a wireless communication network, Endless packet sequence control process by configuring multicast group in PDSN, Receiving a report of location information of the mobile station from the mobile station; A second step of predicting a moving direction and a speed of the mobile station using the reported position information; A third step of joining the RNs on the expected path of the mobile station by using the predicted mobile station's movement direction and speed and configuring the multicast group; Informing the configured multicast group RNs of the estimated handoff time of the mobile station; And A fifth step of informing the multicast group RNs of the estimated handoff time of the mobile station and transmitting data packets after the estimated time to the newly controlled RN by the mobile station; Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method of claim 8, The continuous packet sequence control process in the mobile station, Transmitting a location information to the PDSN; And A seventh step of transmitting the last data packet number received from the existing RN to the new RN when the PDSN moves to one of the multicast group members (RNs) after the PDSN configures the multicast group using the location information of the mobile station; Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method of claim 8, The continuous packet sequence control process in the RN having the multicast group configuration, A sixth step of receiving and recording a handoff estimated time of the mobile station from the PDSN, and storing multicast data after the estimated handoff time of the mobile station from the PDSN; And A seventh step of storing the multicast data, receiving and storing the last data packet number received from the existing RN from the mobile station, and transmitting the data packet after the last data packet number to the mobile station; Endless packet sequence control method for mobility support in a wireless communication network comprising a. The method according to any one of claims 8 to 10, The location information of the mobile station is A method of controlling a continuous packet sequence for mobility support in a wireless communication network, comprising substantially the number of a mobile station, a reporting time, and a signal strength of an adjacent RN. The method according to any one of claims 8 to 10, The estimated handoff time is The location of the mobile station is estimated using the location information and the signal strength, which is the database having the measured signal strength of RN in the RN area, and the distance from the mobile station to the RN boundary, which has the largest value, is obtained. Next, this is a value obtained by dividing this by the speed of a mobile station. The method according to any one of claims 8 to 10, The multicast group member join time is Endless packets for mobility support in a wireless communication network, characterized by subtracting the estimated handoff time of the mobile station from the sum of the time for selecting the RN member of the multicast group and the time for joining the multicast member RN. Sequence control method. In a network resource system with a large processor for packet sequence control of mobility, The PDSN that has jurisdiction over the mobile station when a handoff occurs (hereinafter referred to as "New PDSN") includes: a first function of forwarding a handoff occurrence message to the PDSN (hereinafter referred to as "Old PDSN") that had jurisdiction over the mobile station before the handoff occurred; A second function of receiving a transfer response to the handoff occurrence message from an Old PDSN; A third function of downloading and storing data from an Old PDSN after responding to the handoff occurrence message; A fourth function of preferentially transmitting data downloaded and stored from the Old PDSN to an RN (Radio Network) after a handoff occurs; A fifth function of receiving a data transmission completion message from an Old PDSN after the data has been transmitted from an Old PDSN; And A sixth function of receiving the transmission completion message, confirming that there is no more data stored and downloaded from the Old PDSN, and transmitting data transmitted from the home agent to the RN after the handoff occurrence; A computer-readable recording medium having recorded thereon a program for realizing this. In a network resource system with a large processor for packet sequence control of mobility, A PDSN (hereinafter referred to as "New PDSN") that newly governs a mobile station when a handoff occurs may include: a first function of forwarding a handoff occurrence message to a PDSN (hereinafter referred to as "Old PDSN") that had jurisdiction over the mobile station before the handoff occurred; A second function of receiving a transfer response to the handoff occurrence message from an Old PDSN; And After receiving the delivery response for the handoff occurrence message and receiving a message indicating that the old PDSN has completed the data transmission from the old PDSN to the home agent, the transfer to the normal data transmission state and transmitted from the RN after the handoff occurrence is stored Third function for sending packets to a home agent A computer-readable recording medium having recorded thereon a program for realizing this. In a network resource system with a large processor for packet sequence control of mobility, Endless packet sequence control process by configuring multicast group in PDSN, A first function of receiving and reporting location information of a mobile station from the mobile station; A second function of predicting a moving direction and a speed of a mobile station using the reported position information; A third function of joining the RNs on the expected path of the mobile station by using the predicted movement direction and speed of the mobile station and configuring the multicast group; A fourth function of notifying the configured multicast group RNs of an estimated handoff time of a mobile station; And A fifth function of notifying the multicast group RNs of the estimated handoff time of the mobile station and transmitting data packets after the estimated time to the newly controlled RN by the mobile station; A computer-readable recording medium having recorded thereon a program for realizing this.