KR100545775B1 - An Efficient IP Paging Method Using Distance-based Location Registration - Google Patents

Abstract

The present invention relates to IP paging in next-generation wired and wireless communication networks, and more particularly, to a method for performing efficient IP paging using a routing protocol called RIP as a distance-based location registration method proposed in the previous two layers. That is, the present invention can perform efficient paging in the IP network by performing the IP paging using the distance-based location registration method in paging in the IP network, the paging area is not fixed, based on the number of hops The paging area can be set dynamically. As a result, all FAs in the IP network perform paging-related functions, thereby buffering data and distributing FAs that perform paging-related functions as a whole. In addition, the scalability is improved because the paging area is dynamically set when the terminal registers without the hassle of manually setting the paging area by the network manager whenever the network structure is changed.

Description

Efficient IP paging method using distance-based location registration {IP PAGING METHOD USING LOCATION REGISTRATION BASED ON DISTANCE}

1 is a signal processing flowchart of a conventional mobile IP,

2 is a diagram illustrating a packet forwarding process from a conventional mobile IP to a mobile host;

3 is a state diagram of a terminal using a conventional paging scheme;

4 is a diagram illustrating a list of location registration and paging schemes proposed in the conventional second layer;

5 illustrates an example of a conventional IP paging structure;

6 is an exemplary diagram illustrating an IP paging network structure and a paging area setup according to an embodiment of the present invention;

7 is a diagram illustrating a paging area list included in an FA according to an embodiment of the present invention;

8 is a format diagram of a paging area list added to a registration response message according to an embodiment of the present invention;

9 is a flowchart of location registration processing in a mobile terminal according to an embodiment of the present invention;

The present invention relates to IP paging in next-generation wired and wireless communication networks, and more particularly, to an efficient IP paging method using a RIP routing protocol as a distance-based location registration method.

The popularity of the Internet and the development of mobile communication have naturally brought about the background of the appearance of the wireless Internet, and with the advent of the wireless Internet, mobility has been required for the existing Internet hosts. The IETF, the Internet standardization organization, already proposed mobile IP in 1996 to provide host mobility on the Internet.

FIG. 1 illustrates a basic operation process between entities of a conventional mobile IP. Referring to FIG. 1, all mobile agents (MAs) periodically transmit an Agent Advertisement message to inform their mobility support. The mobile host may transmit an agent solicitation message for requesting an agent advertisement message to a foreign agent belonging to the network where the mobile host is located, and by receiving an agent advertisement message, the mobile host may transmit an agent advertisement message. It may be determined whether it is located in a home network or moved to a new external network. The mobile host sends a registration request message to a home agent (HA) and receives a registration reply message to establish mobility binding between a home address and a care of address (COA). After the registration with the HA is completed, the data packet to the mobile host is delivered to the HA of the home network, as shown in FIG. Pass the packet.

However, the initial mobile IP has many problems to be applied to the new cellular environment as it is.

Paging technique is a two-layer technology currently used in the cellular location management technique, and has the advantage of reducing the network load and reducing the power consumption of the terminal by reducing the signaling generated for accurate location management of the terminal. In this case, by using a location registration method and a paging scheme, the terminal supports an active mode and a dormant mode as shown in FIG. 3. That is, referring to FIG. 3, the terminal in the active mode 300 notifies the network every time it moves (S1), but only when it leaves the paging area when the terminal is in the power saving mode dormant mode 302. Notify the network (S4) and do not notify the network when in the paging area. In the active mode 300, when there is no communication for a predetermined time and the timeout occurs, the terminal is changed back to the power saving mode dormant mode 302 (S2). In the dormant mode 302, the terminal has data to send or network Receiving a paging request message from the switch back to the active mode (300).

In the study of location registration methods and paging schemes that are in a trade-off relationship, the biggest focus is always to lower overall costs. As shown in FIG. 4, location registration methods and paging techniques in the second layer are already numerous methods. Is proposed. However, many of the proposed schemes have good theoretical performance but are difficult to implement. Therefore, the current cellular network uses a relatively simple LA-based update algorithm and blanket polling technique.

On the other hand, with the development of the Internet and mobile communication, there is much expectation that it will become an IP-based network in the next generation wireless communication network. Proposed schemes for IP paging can be categorized according to the subject that actually starts paging. The methods that do not deviate from the mobile IP basic structure are HA paging and FA paging.

FIG. 5 illustrates a conventional paging procedure, in which a subject buffering data destined for a terminal and finding a terminal in a paging area becomes HA or FA as shown in FIG. The HA paging shown in FIG. 5 (a) is simple to implement because only the HA and the terminal need to be modified, but the scalability and reliability are inferior because it puts too much load on one HA, and the HA and the terminal actually paging are far apart. If present, there is a problem of paging delay. The FA paging shown in FIG. 5 (b) may be easily implemented as a method in which the most recently registered BS starts paging, and is more scalable than HA paging.

The domain paging shown in (c) of FIG. 5 may be any of a router and a BS whose subject of paging is in the domain. Routers in the domain have a paging information about the terminal as a soft state, and data destined for the terminal comes down from the domain root router (DRR) to determine whether to page itself. This decision has its own algorithm, and once the decision is made, the data is buffered and the terminal is found in the paging area. This method improves reliability by distributing the load on the paging process, but it is difficult to implement because all routers in the domain must have the paging function. PA paging, which is a method of processing a paging by placing a new entity called a paging agent (PA) shown in FIG. 5 (d), has a burden of adding a new entity at present.

Recently, research on IP paging or DMHA (Dormant Mode Host Alerting), which enables the above location registration method and paging scheme to operate at the IP layer, is being actively conducted. It is expected to be able to support mobile IP service efficiently in future IP based next generation network if it is added to mobile IP which is mobility protocol of.

Accordingly, an object of the present invention is to provide an IP paging method using distance-based location registration that enables efficient paging in an IP network by applying a distance-based location registration method to mobile IP using a routing protocol called RIP in three layers. .

In order to achieve the above object, the present invention provides an efficient IP paging method using distance-based location registration. (A) When a mobile terminal moves out of a paging area to which it currently belongs to an external network, new mobile IP registration is performed by HA. Requesting; (b) when new mobile IP registration is requested from the terminal, adding information on a paging area of a location where the terminal is moved to the terminal in response to a registration response message; (c) receiving the information on the paging area, receiving the advertisement message of the new FA of the moved position in the dormant mode and checking whether the new FA is included in the FA list in the paging area; ; (d) if the new FA does not exist in the FA list in the paging area, storing the new FA in the FA list in the page area and updating the location information of the terminal to complete the mobile IP registration; It features.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

6 illustrates an IP paging concept according to an embodiment of the present invention. In the present invention, a network of FA paging is selected as a basic structure among the paging protocol methods proposed so far. This is because the performance is similar to that of the basic mobile IPv4 network, with the least additions and expansions.

Referring to FIG. 6, the BS is a router at the lowest end of the network serving as a FA, and is also a subject that buffers the data and starts paging when data destined for the terminal in the dormant mode arrives. In this structure, other entities such as the terminal and the HA except the FA (BS) do not need an extension for a paging function, and perform only basic mobile IP functions. In other words, when data destined for the terminal in the dormant mode arrives in the HA, the data is tunneled to the basic mobile IP and sent to the previously registered FA. This is the same basic mobile IP behavior. When data arrives at a previously registered FA, the FA immediately buffers the data and finds a terminal in a paging area, which is a basic procedure for finding a terminal in FA paging.

Meanwhile, in the present invention, as shown in M1 of FIG. 6, when the UE registers a new mobile IP in BS2, information about a paging area is added to the registration response message and sent to the UE. In the case of FIG. 6, the paging area is given by hop = 1, and in the registration response message from BS2 to the terminal, {BS1, BS2, BS3}, which is a list of FAs having a hop number of '1' in BS2, is added. The area is set as shown in paging area 1. The list of FAs belonging to one paging area has the information of the IP address as shown in FIG. 7, and the message format of the FA list belonging to the paging area added to the registration response message is as shown in FIG. 8.

Information on the number of hops is always maintained for each BS using a routing protocol such as RIP, and the hop value may be fixed by the domain manager or may be determined according to a movement pattern of the user terminal. The larger the hop value, the larger the paging area, and the smaller the hop value, the smaller the paging area. The size of the paging area may be determined according to the movement pattern of the user.

Since the state of the terminal when receiving the information on the paging area is an active mode, no additional radio link waste occurs in the modern mode where power should be saved. When the mobile station moves within the paging area in the same dormant mode as in M2 of FIG. In addition, when moving, as in M3, the terminal receives an advertisement message from BS4 and requests a new location registration because the BS is not in the FA list in its paging area. In this case, the registration response message includes {BS3, BS4, BS5}. A list, such as, is added and sent to set an area, such as paging area 2.

9 illustrates a location registration process flow according to an embodiment of the present invention. Referring to FIG. 9, when the UE moves to a new FA (S900), the UE receives an advertisement message of a new FA (S902) and checks whether the new FA exists in the FA list in the paging area (S904). . At this time, if the new FA does not exist in the FA list in the paging area, the mobile station stores the new FA in the FA list in the paging area and updates the location (S906).

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, in the present invention, in paging in an IP network, by performing IP paging using a distance-based location registration method, efficient paging can be performed in an IP network, and a paging area is not fixed and hops are performed. Paging area can be set dynamically based on the number. Accordingly, all FAs in the IP network perform a paging-related function, thereby buffering data and distributing a FA that performs paging-related functions as a whole. In addition, since the paging area is dynamically set when the terminal is registered without the hassle of manually setting the paging area by the network manager whenever the network structure is changed, scalability is improved.

Claims (7)

IP paging method for distance-based location registration, (a) requesting a new mobile IP registration to the HA when the mobile terminal moves out of the paging area to which the mobile terminal currently belongs to the external network; (b) when new mobile IP registration is requested from the terminal, adding information on the paging area of the location where the terminal is moved to the registration response message and transmitting the information to the terminal; (c) receiving the information on the paging area, receiving the advertisement message of the new FA of the moved position in the dormant mode and checking whether the new FA is included in the FA list in the paging area; ; (d) if the new FA does not exist in the FA list in the paging area, storing the new FA in the FA list in the page area and updating the location information of the terminal to complete the mobile IP registration; IP paging method for distance-based location registration comprising a. The method of claim 1, In the step (c), when the mobile terminal is in the active mode, (c1) the mobile terminal further comprises the step of performing the mobile IP registration using the received paging area information as it is; IP paging method for base location registration. The method of claim 1, After the step (d), (e) if there is a data transmission request to the mobile terminal, the new FA receiving a data packet requested to be transmitted from an HA; (f) buffering the data packet and transmitting the packet to the corresponding terminal IP paging method for distance-based location registration, characterized in that it further comprises. The method of claim 1, In the step (b), the paging area, IP-based paging method for distance-based location registration, characterized in that it is generated dynamically using a distance-based location registration method. The method of claim 4, wherein The distance-based location registration method, IP paging method for distance-based location registration, characterized in that based on the RIP routing protocol. The method of claim 4, wherein In the step (b), the paging area is determined in the FA based on the hop number determined by the administrator, and when the hop number decreases to 2, the paging area is within 2 and the hop number based on the RIP as a routing protocol. The IP paging method for distance-based location registration, characterized in that the list of routers are included in the registration response message sent from the HA to the terminal. The method of claim 6, In step (a), when the number of hops of the paging area is set to "2", the mobile terminal requests a new mobile IP registration only when the distance exceeds "2" in the initially registered FA. IP paging method for distance-based location registration, characterized in that the new mobile IP registration is not requested when moving the distance.

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