KR100594427B1 - Method of paging area setting and paging for hierarchical mobile IP - Google Patents

Abstract

The present invention relates to a paging area establishment and paging method in hierarchical mobile IP.

According to the present invention, a hierarchically configured router stores address and hop information of a router acting as a paging agent for paging area setting in a paging area setting message and transmits the information to a terminal, thereby not using a paging area identifier separately. By setting and enabling the paging, it is possible to save the radio channel resources according to the transmission of the paging area identifier, thereby enabling efficient resource use.

Paging Area Settings, Paging, Hierarchical Router, Paging Agent

Description

Method of paging area setting and paging for hierarchical mobile IP}

1 is a block diagram showing the structure of a packet used for setting a conventional paging area.

2 is a block diagram illustrating a structure of a packet used for paging area setting in a hierarchical mobile IP according to an embodiment of the present invention.

3 is a diagram illustrating a network configuration and processing flow for setting a paging area in a hierarchical mobile IP according to an embodiment of the present invention.

4 is a diagram illustrating a network configuration and processing flow for paging in a hierarchical mobile IP according to an embodiment of the present invention.

5 is a flowchart illustrating an operation of determining whether to move to a new paging area in a hierarchical mobile IP according to an embodiment of the present invention.

The present invention relates to paging area setting in hierarchical mobile IP. In particular, the present invention relates to a paging area in hierarchical mobile IP, in which hierarchical mobile IP networks efficiently utilize resources to set a paging area and to page. It relates to a setting and a paging method.

Paging is a technology used to reduce the power consumption of the terminal and the traffic for location information management by supporting the sleep mode of the terminal as in the current mobile communication network.

The existing IP paging method uses a separate paging area identifier for paging area setting and paging, and the paging area identifier uses more than 32 bits of information.

1 is a block diagram showing the structure of a packet used for setting a conventional paging area.

Referring to FIG. 1, when a separate paging area identifier is used, each router should include the paging area identifier in information periodically transmitting.

Thus, as shown in FIG. 1, 32 bits of paging area identifier and 32 bits for information representation are additionally transmitted.

That is, in the conventional paging method using a paging area identifier, since the router must transmit 256-bit packets including additional 64-bits as shown in FIG. There is a problem that it is difficult to manage the mobility of the radio channel, and waste of the radio channel occurs.

The technical problem to be solved by the present invention is to solve the above problems, to set the paging area in the hierarchical mobile IP that can set the paging area, save the wireless channel in performing the paging, and efficiently utilize resources Its purpose is to provide a method and a paging method.

According to an aspect of the present invention, a method for setting a paging area in a hierarchical mobile IP includes: a hierarchical mobile IP network including a first router having a paging agent function and a second router having no paging agent function; A method of setting a paging area in a wireless terminal by using packet transmission through a first router and a second router, the method comprising: (a) the first router is configured with its own address information and a predetermined value in a packet received from an upper layer; Broadcasting by adding hop number information; (b) the second router increasing a hop number information included in a packet received from an upper layer by a predetermined value and broadcasting the packet; And (c) receiving the paging area setting message transmitted from the terminal by the first router and the second router, and confirming the paging area set by the terminal, wherein the terminal receives the broadcast packet. The paging area is set based on the hop number information included in the PDP, and the page area setting message corresponding thereto is transmitted to the router.

delete

In addition, when the terminal set the paging area is moved, (A) the first router and the second router to transmit a packet for setting a new paging area in accordance with the movement of the terminal; And (b) setting a paging area for the corresponding terminal by receiving a new paging area setting message transmitted by the first router and the second router according to whether the terminal sets a new paging area.

The paging method in the hierarchical mobile IP according to an aspect of the present invention is a method for performing paging in a hierarchical mobile IP composed of a plurality of routers configured hierarchically, and the method includes an address transmitted from a router and a terminal; When the terminal sets the paging area using the hop number information, the routers perform paging based on the paging area set by the terminal. To this end, the method includes: (a) the highest first router layer receiving a paging message for transmission to the terminal sets a hop limit value in an IP header of the paging message based on hop number information of the paging area set by the terminal; Sending a paging message to another second router; (b) the second router receiving the paging message, reducing the hop limit value of the IP header of the paging message by one and storing it as a new hop limit value; And (c) checking whether the hop limit value newly stored by the second router is '0', and if it is not '0', transmitting a paging message in which the new hop limit value is stored to another router to be transmitted to the terminal. It includes.

delete

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 accompanying drawings, parts irrelevant to the description of the present invention are omitted in order to clearly describe the present invention, and the same or similar parts are denoted by the same reference numerals.

2 is a block diagram illustrating a structure of a packet used for paging area setting in a hierarchical mobile IP according to an embodiment of the present invention.

Referring to FIG. 2, the structure of a packet according to an embodiment of the present invention includes a type, a length, a distance, a priority, a pref, an R, an I, a P, a V, an S, and a reservation ( Res), Lifetime (Vailed Lifetime), and Global IP Address (MAP) fields.

The type field defines the type of the corresponding packet, and the length field indicates total length information.

The distance field indicates distance information between a transmitting node and a receiving node of the packet, R, I, P, V, and S indicate various flag information used in the packet, and the reserved field is a field left for later use.

The lifetime field indicates valid time information of the IP address of the MPA included in the packet, and the global IP address field indicates a global IP address assigned to the MAP of the system.
According to an embodiment of the present invention, since the hop number information from the corresponding router to the terminal is added to the Dist field without using a paging area identifier in the hierarchical mobile IP and the paging area is set using the paging area identifier, the paging area identifier corresponds to the paging area identifier. Packet size is reduced.

delete

A method of setting a paging area in a hierarchical mobile IP according to an embodiment of the present invention using the above packet is as follows.

3 is a diagram illustrating a network configuration and processing flow for setting a paging area in a hierarchical mobile IP according to an embodiment of the present invention.

Referring to FIG. 3, Mobility Anchor Points (MAPs) serving as paging agents in the hierarchical routers 311 to 334 include their own address information and set the Dist field to '1'. Send the same packet.

At this time, the intermediate routers increase the Dist field (hereinafter referred to as hop number value) by 1 to the received packet and transmit the packet to the next router. At this time, when the intermediate router performs the MAP function, it adds its own address information and forwards the packet to the next router.

When packets are delivered from the highest routers 311 and 312 to the lowest routers 331 to 334, the lowest routers 331 to 334 receive packets having one or more MAP addresses and hop number values, and through the wireless channel. Send to the terminal.

Upon receiving the above information, the terminal recognizes an area capable of receiving information composed of the same MAP address and the same hop number value as one paging area.

Referring to FIG. 3 in more detail, first, the top router 311 transmits a packet for setting a paging area to the terminal 341, and the router 311, the router 312, and the router 322 of FIG. 3. Suppose that the MAP function is performed, and the addresses of the router 311, the router 312, and the router 322 having the MAP function are respectively M1, M2, and M3.

First, the router 311 and the router 312 performing the MAP function exchange packets including their address and hop number information.

The router 311 and the router 312 add their own address and hop number information to the received packet, and '+1' the hop number received from the counterpart router to transmit to the next router.

In this case, each packet will be represented as RA [router address, hop number].

That is, the router 311 transmits the RA [M1, 1] to the router 312, and the router 312 transmits the RA [M2, 1] to the router 311.

Then, the router 311 adds its address and hop number information to the packet, and '+1' to the hop number information received from the router 312 to follow RA [M1,1] [M2,2]. Router 321, which is a router, transmits to router 322.

Then, since the router 321 is an intermediate router having no MAP function, only the number of hops of the corresponding information is '+1' and the RA [M1, 2] [M2, 3] is transmitted to the router 331.

Since the router 322 has a MAP function, the router 322 adds its own address and the number of hops, and increases the number of hops from the router of the previous layer so that RA [M1,2] [M2,3] [M3,1 ] Is transmitted to the router 331 and the router 332.

Router 331 is the smaller of RA [M1,2] [M2,3] received from router 321 and RA [M1,2] [M2,3] [M3,1] received from router 322. RA [M1,2] [M2,3] [M3,1] including all MPA information with hop count information increases RA [M1,3] [M2,4] [M3,2] only by increasing the hop count To send.

By the above method, the router 332 transmits RA [M1,3] [M2,4] [M3,2] to the terminal, and the router 333 transmits RA [M1,4] [M2,4] to the terminal. The router 334 transmits the RA [M1,4] [M2,4] to the terminal.

The first terminal group 341 sets [M1, 3] or [M3, 2] as a paging area in the wireless region 340 by the packet transmitted from the lowest router.

The second terminal group 342 sets [M1, 4] as a paging area.

When a UE sends a binding update (aka paging area setup message) by a paging area composed of a MAP address and a hop number value, the terminal sends the paging area to which the router belongs by including the hop number value. I can tell you.

The paging method according to the paging area setting according to the embodiment of the present invention described above is as follows.

4 is a diagram illustrating a network configuration and processing flow for paging in a hierarchical mobile IP according to an embodiment of the present invention.

Referring to FIG. 4, when data transmitted to a terminal in a dormant mode for paging in a hierarchical mobile IP having a hierarchical structure as shown in FIG. 3 is transmitted to the uppermost routers 311 and 312, the corresponding terminal is registered. The paging is performed by referring to the hop number value of the paging area.

That is, when the router 311 receives data to be transmitted to a terminal belonging to the first terminal group 341, since the first terminal group 341 sets [M1, 3] as the paging area, the router 311 In consideration of the number of hops according to the paging area value, the broadcaster sets and hops the number of hops to which an IP packet can be delivered.

In more detail, in order to transmit data to the first terminal group 341, the router 311 includes a hop limit value 3 in the IP header portion of the packet including the data, and then the routers 312, 321, and 322. To send.

Then, the router 321 reduces the hop limit value 3 of the received packet by '1' to determine whether its hop number value 2 is '0'. If its hop number value 2 is not '0', it stores its hop number value 2 as a new hop limit value in the IP header of the packet and transmits it to the next router 331.

In addition, the router 331 obtains its own hop number value 1 by decreasing the '1' from the hop number value 2, which is the hop limit value of the received packet, and again the corresponding packet since the value is not '0'. A new hop number value 1 may be newly stored in an IP header of the first header group 341 to transmit data.

Like the router 321, the router 322 may transmit data to the first terminal group 341.

 Since the hop limit value of the packet received from the router 311 decreases the hop count value 3 by '1', the router 312 obtains its own hop count value 2, and the value is not '0', It stores its hop number value 2 in the IP header of the packet and transmits it to the routers 323 and 324.

In addition, the router 323 decreases the hop number value 2 of the received packet by '1', obtains its own hop number value 1, and since the router 323 is not '0', it hops back to the router 333. You can send an updated packet with a numeric value.

However, when the router 333 decreases the hop number value 1 of the received packet to '1', the router 333 does not transmit any more packets and drops the packet.

Therefore, a router having a hop number greater than or equal to the set paging area of the terminal cannot transmit data to the corresponding terminal.

When the paging area is set according to the embodiment of the present invention and the paging area needs to be newly set due to the mobility of the terminal in the paging method, the following operation is performed.

5 is a flowchart illustrating an operation of determining whether to move to a paging area in a hierarchical mobile IP according to an embodiment of the present invention.

Referring to FIG. 5, when the terminal moves, it receives a RA message for setting a paging area from the router of the wireless communication area (S501).

It is determined whether the address of the router included in the RA message belongs to the address of the router previously set as the paging area (S502). If the router address set as the previous paging area is included, the number of hops is the same (S503). If the router has the same address and hop number as the previous paging area, the new paging area is not used.

However, if the router address is not included in the router address set in the previous paging area in the RA message received in step S501, a binding update is performed to set a new paging area (S504), and the router address is included in the previous paging area. Although the number of hops is incorrect, the new binding update is performed (S504).

Referring to the network structure of FIG. 3 in detail, if the terminal that is in wireless communication with the router 331 moves to the router 332, the terminal from the router 332 RA [M1,3] [M2, 4] [M3, 2] is received (S501).

And, the previous paging area of the terminal was set to [M1, 3] by the router 331.

Therefore, the RA message received from the router 332 includes the address M1 of the router set as the previous paging area (S502), and the number of hops is also the same, so that a new paging area setting is not necessary.

However, when the mobile station that moves to the router 332 and performs wireless communication moves to the router 333 again, the terminal receives RA [M1,4] [M2,4] from the router 333 again. Done.

Then, the router address of the RA message received from the router 333 by the previous paging area [M1, 3] is included in the router address of the previous paging area.

However, when comparing the number of hops, since the previous paging area was [M1,3] and the RA message received from the router 333 is [M1,4], it can be seen that the number of hops is incorrect.

Therefore, the terminal must perform binding update to set up a new paging area.

Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

As described above, the paging area setting and paging method in the hierarchical mobile IP according to the present invention, the paging area is set without using a paging area identifier for paging in the mobile IP configured as a hierarchical router, By doing so, there is an effect of improving the resource utilization efficiency by saving the radio channel resources consumed for the transmission of the paging area identifier.

Claims (8)

In a hierarchical mobile IP network including a first router having a paging agent function and a second router not having a paging agent function, the wireless terminal uses a packet transmission through the first router and the second router to establish a paging area. In the setting method, (a) the first router adding and broadcasting its address information and hop number information set to a predetermined value to a packet received from an upper layer; (b) the second router increasing a hop number information included in a packet received from an upper layer by a predetermined value and broadcasting the packet; And (c) the first router and the second router receiving a paging area setting message transmitted from the terminal, and confirming the paging area set by the terminal based on this; Including; The terminal sets a paging area based on the hop number information included in the broadcast packet, and transmits the page area setting message corresponding to the paging area in the hierarchical mobile IP. The method of claim 1, The packet received from the upper layer by the first router or the second router includes addresses of all routers belonging to the uppermost layer and hop number information between the routers. The method of claim 1, In the step (c), The paging area setting message transmitted from the wireless terminal, The paging area setting method of the hierarchical mobile IP including information that is set to one paging area for the packet configured with the same first router and the same hop number value for the router for the received packet. The method of claim 1, The hop value stored in the packet is stored in a distance information field (Dist field) of the packet. The method of claim 1, When the terminal set the paging area is moved, (A) the first router and the second router transmitting a packet for setting a new paging area according to the movement of the terminal; And (B) receiving a new paging area setting message transmitted by the first router and the second router according to whether the terminal sets a new paging area and setting up a paging area for the corresponding terminal based on the new paging area setting message; How to set up a paging area in the hierarchical mobile IP including more. The method of claim 5, In the step (b), The new paging area setting message received from the terminal, Whether the address of the first router included in the packet transmitted by the first router and the second router is in the previous router area of the terminal, and if the same first router address exists in the previous router area, A method of establishing a paging area in a hierarchical mobile IP, wherein the hop number information is newly created depending on whether the hop number information is the same as the hop number information of the previous paging area. In the method for performing paging in a hierarchical mobile IP composed of a plurality of routers configured hierarchically, In the above method, when the terminal sets the paging area by using the address and hop number information transmitted from the router, the routers perform paging based on the paging area set by the terminal. (a) The highest first router layer receiving the paging message for transmission to the terminal sets a hop limit value in the IP header of the paging message based on the hop number information of the paging area set by the terminal and transfers it to another second router. Sending a paging message; (b) the second router receiving the paging message, reducing the hop limit value of the IP header of the paging message by one and storing it as a new hop limit value; And (c) checking whether the hop limit value newly stored by the second router is '0' and if it is not '0', transmitting a paging message in which the new hop limit value is stored to another router to be transmitted to the terminal; Paging method in a hierarchical mobile IP that includes. The method of claim 7, wherein In step (b), If the new hop limit is equal to '0', then the router receiving the paging message drops the paging message and no longer transmits it.

Images