WO2003055104A1

WO2003055104A1 - Communication apparatus, communication terminal apparatus, and communication method

Info

Publication number: WO2003055104A1
Application number: PCT/JP2002/012947
Authority: WO
Inventors: Akito Fukui; Shinobu Yagi
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2001-12-11
Filing date: 2002-12-11
Publication date: 2003-07-03
Also published as: JP2003179616A; AU2002366919A1

Abstract

A detection unit (112) detects that a handover is going to be completed and reports it to an upper layer processing unit (113). Upon reception of completion of handover, the upper layer processing unit (113) outputs a request for an agent advertisement message to a transmission unit. A transmission unit (114) transmits the data output from the upper layer processing unit (113) and the request for the agent advertisement message as radio signals. Upon reception of the request for the agent advertisement message, the upper layer processing unit (132) creates an agent advertisement message and outputs it to a transmission unit (134). The upper layer processing unit (113) creates a position registration message including the local IP address and the IP address of FA of the base station apparatus performing communication after the handover and outputs it to the transmission unit (114).

Description

Technical field

The present invention relates to a communication device and a communication system in a mobile communication system using the Internet Protocol (IP), and more particularly to a communication device suitable for Mobi1e IP.

The present invention relates to an apparatus and a communication method.

Field background technology

One of the protocols for using the Internet communication protocol IP (Internet Protocol) designed for use in wired fixed networks in wireless mobile networks

There is Mobile IP.

The exchange of communication using Mob i 1 e IP will be described below. Figure 1 shows

RFC 2002 IP Mobilit

FIG. 11 is a sequence diagram in a case where the mobility management of the mobile terminal is performed by using “Support”.

Hereinafter, a conventional mobile communication system using the RFC 2002 shown in FIG. 1 will be described. In the mobile communication system of FIG. 1, the UE 11 communicates with the BS 13 and the BS 14, and communicates with the TE 15 via the HA 12 using IP.

UE 11 is a mobile terminal (UE: User Equipment) that implements the mobile node (MN) function defined in RFC2002. BS 13 is a radio base station (BS) that implements the foreign agent (FA) function defined in RFC2002, and similarly, BS 14 is a radio base station that implements: FA. The HA 12 implements the home agent (HA) function defined in RFC2002, and the TE 15 is a terminal (TE: terminal equipment) that communicates with the UE 11. When transmitting a packet from the UE 11 to the TE 15, the packet is transmitted from the UE 11 to the TE 15 without going through the HA 12.

When transmitting a packet from the TE 15 to the UE 11, the packet is transmitted from the TE 15 to the HA 12. Then, the HA 12 transmits the packet to the BS 13 or the BS 14 to which the UE 11 belongs. Then, BS 13 or BS 14 transmits the packet to UE 11.

In this way, the HA 12 sets ^ & for packet delivery to the UE 11. Here, when the base station with which the UE 11 communicates by radio signals is switched from the BS 13 to the BS 14, it is necessary to reset the location registration of the UE 11, that is, the above-mentioned packet delivery.

Hereinafter, the location registration procedure after the UE 11 switches the communication partner from the BS 13 to the BS 14 and performs a so-called handover will be described. Since the position registration procedure shown in FIG. 1 is disclosed in detail in RFC 2002, it will be briefly described here.

First, UE 11 performs handover from BS 13 to BS 14. After the handover is completed, the MN function of the UE 11 waits for the transmission of an agent advertisement message in which the IP address of the FA function of the BS 14 is set.

Then, after receiving the agent advertisement message, the UE 11 generates a location registration message including the IP address of the UE 11 and the IP address of the FA function of the BS 14 as a new communication partner, and transmits the location registration message to the HA 12. The HA 12 records the IP address of the UE 11 and the IP address of the FA function to which the UE 11 belongs according to the location registration message.

As a result, the HA 12 can recognize the IP address of the FA function of the BS 14 as the handover destination, and can transmit a packet addressed to the UE 11 via the BS 14.

This agent advertisement message is information necessary for the moving UE to register the FA to which the UE belongs to the HA (location registration). Therefore, it is necessary for the FA of the base station device to transmit the agent advertisement message at short time intervals.

However, when the agent advertisement message is transmitted at short time intervals, the ratio used for transmitting the agent advertisement message becomes high in the band used for communication, and there is a problem that the band used for data transmission decreases.

For this reason, to avoid wasting bandwidth:: FC 200 recommends a maximum interval of one agent advertisement message per second. For this reason, the UE has performed a handover: ^, the location registration is performed after receiving the agent advertisement message after the handover, but the agent advertisement message is transmitted at 1-second intervals: ^, the maximum 1-second location Registration delay may occur, resulting in a packet loss of one second. This means that when communicating at 2 Mbps, a packet of about 24 Ok bytes is lost.

As described above, in the conventional apparatus, a packet transmission loss addressed to the communication terminal apparatus occurs after the handover. Disclosure of the invention

An object of the present invention is to provide a communication device, a communication terminal device, and a communication method that can reduce the loss of packet transmission addressed to the communication terminal device during handover. The purpose of this is that when the communication adjustment device performs a so-called handover, which switches the communication device of the communication partner, before the base leaking device sends a periodic agent advertisement message (Agent Advertisement). That is, immediately after the handover is completed, the communication terminal immediately transmits the agent advertisement message, which is information necessary for registering the location after the handover to the HA, and the base station transmits the agent advertisement message to the communication terminal. Then, the communication terminal registers the post-handover position with the HA, the HA determines the routing for transmitting the packet to the communication terminal after the handover, and reduces the position registration delay of the communication terminal during the handover. This is achieved by BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a sequence diagram for managing the mobility of mobile terminals,

FIG. 2 is a block diagram showing an example of a configuration of a network including the reference device according to Embodiment 1 of the present invention.

FIG. 3 is a sequence diagram illustrating an example of a communication procedure in a network including the device according to the above embodiment;

FIG. 4 is a block diagram showing an example of a configuration of a network including a base device according to Embodiment 2 of the present invention.

FIG. 5 is a sequence diagram illustrating an example of a communication procedure in a network including devices according to the above-described embodiment.

FIG. 6 is a block diagram showing an example of the configuration of a network including the base crane device according to the third embodiment of the present invention;

FIG. 7 is a sequence diagram illustrating an example of a communication procedure in a network including the basic device according to the above embodiment.

FIG. 8 is a block diagram illustrating an example of a configuration of a network including a base device according to Embodiment 4 of the present invention.

FIG. 9 is a sequence diagram showing an example of a communication procedure in a network including the above-described basic device.

FIG. 10 is a block diagram showing an example of a configuration of a network including a ffiil device according to a fifth embodiment of the present invention;

FIG. 11 is a sequence diagram illustrating an example of a communication procedure in a network including the ffi device according to the above-described embodiment.

FIG. 12 is a block diagram showing an example of a configuration of a network including a base device according to a sixth embodiment of the present invention;

FIG. 13 is a sequence diagram showing an example of a communication procedure in a network including the above-described difficult station apparatus. BEST MODE FOR CARRYING OUT THE INVENTION

In wireless communication using Mobile IP, in order for a communication terminal device performing handover to promptly register a location, the FA of the base station device needs to transmit an agent advertisement message at short time intervals. .

However, when agent advertisement messages are transmitted at short time intervals, there is a problem that the ratio used for transmitting agent advertisement messages increases in the bandwidth used for communication, and the bandwidth used for data transmission decreases.

The inventor of the present invention has focused on the fact that if the transmission interval of the agent advertisement message is lengthened to avoid wasting bandwidth, the communication terminal device performing handover will experience a delay before re-registering the location. I came to.

That is, the gist of the present invention is that, when a communication terminal device performs a so-called handover in which the communication terminal device switches a communication partner base station device, the fiber station device transmits a periodic Agent Advertisement. Immediately after the handover is completed, that is, immediately after the handover is completed, the base device sends an agent advertisement message to the communication terminal device, and the communication terminal device sends a location registration message after the handover to the HA, The HA determines the routing for transmitting the packet to the terminal device after the handover, and reduces the position registration of the communication terminal device at the time of the handover to reduce the packet transmission loss.

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

(Form of difficulty 1)

FIG. 2 is a block diagram showing an example of a configuration of a network including the base device according to the first embodiment of the present invention. The network in Fig. 2 is an example of a network to which Mobile IP is applied.

In the network of FIG. 2, UE (User Equipment) 101, HA (Home Agent) 102, BS 103, BS 104, and TE 105 are mainly connected. Configuration.

UE 101 is a communication that implements the mobile node (MN: Mobile Node) function and wireless interface layer 1 function (LAYER1) of the Mobi 1 e IP network defined in RFC 20◦2. It is a terminal device. U E 101 acts as a host or router that changes the point of connection from one network or sub-network to another.

This mobile node can change its position (the point of connection to the subnet network to which it belongs) without changing the IP address. This means that a mobile node can continue to communicate with nodes on other networks using its (unchanged) IP address wherever it can make a link-layer connection to a point of attachment. it can. Layer 1 corresponds to the physical layer of the OSI hierarchical model. The UE 101 mainly includes a receiving unit 111, a detecting unit 112, an upper layer processing unit 113, and a transmitting unit 114. The receiving unit 111 receives a radio signal transmitted from a base station 11 device such as BS103 or BS104, and processes this radio signal for amplification, conversion to a baseband frequency, demodulation, and decoding. And outputs the obtained received signal to the detection unit 112 and the upper layer processing unit 113.

The detecting unit 112 detects that the handover is completed from the received signal, and notifies the upper layer processing unit 113 that the handover is completed. The upper layer processing unit 113 is responsible for performing a received signal in a layer higher than layer 1. Further, when the upper layer processing unit 113 receives the notification of the handover completion, it outputs a request for an agent advertisement message to the transmission unit. Then, the upper layer processing unit 113 generates a location registration message including the IP address of its own station and the IP address of the FA of the base station device that performs communication after handover, and sends it to the transmission unit 114. Output. The transmitting unit 114 performs coding, modulation, conversion to a radio frequency, and data amplification of the data output from the upper layer processing unit 113, the request for the agent advertisement message, and the location registration message. Transmit as a signal.

HA 102 stores the IP address of the FA of the device to which the UE is currently connected. Device. The HA 102, as a device on the UE's home network, tunnels a packet (datagram) to be delivered to the UE to the FA to which the UE has moved when the UE leaves the home network.

BS 103 and BS 104 implement the foreign agent (FA: Foreign Agent) function and the wireless interface function 1 as defined in RFC 2 This is a base station device that performs communication using signals.

The BS103 and BS104 function as foreign agents on the network to which the UE visits, and provide the FE with a route service through the RFC202. This foreign agent receives the packet (datagram) addressed to the UE tunneled by the UE's home agent, extracts the packet from the tunnel, and sends the extracted packet to the UE.

The BS 103 mainly includes a receiving unit 1331, an upper layer processing unit 132, a network queuing interface 133, and a transmitting unit 134. Receiving section 13 1 receives a radio signal transmitted from the communication terminal apparatus, amplifies the radio signal, modulates and demodulates the radio signal to a baseband frequency, and decodes the received signal, and converts the obtained received signal to a higher layer. Output to processing section 1 32.

The upper layer processing section 13 2 is responsible for processing performed in a layer higher than layer 1, performs processing performed in a layer higher than layer 1 on a received signal output from the receiving section 13 1, and performs Output to evening festival 1 3 3 Also, the packet output from the network interface 133 is processed in a layer higher than the layer 1 and output to the transmitting unit 134. Further, when receiving a request for an agent advertisement message from the UE, the upper layer processing unit 132 creates an agent advertisement message and outputs it to the transmission unit 134.

The network interface 133 carries out layer 1 processing between the network and the upper layer processing section 132 and relays the data. The transmitting unit 134 encodes, modulates, converts to a radio frequency, and amplifies the bucket and the agent advertisement message output from the upper layer processing unit 132 to generate a radio signal. To send.

The BS 104 has a configuration similar to that of the BS 103, and mainly includes a reception unit 141, an upper layer processing unit 142, a network interface 143, and a transmission unit 144. TE 105 communicates with UE 101 to transmit and receive packets.

Next, the operation of the network including the basic ethnic device according to the embodiment of the present invention will be described. FIG. 3 is a sequence diagram showing an example of a communication procedure in a network including the base station device according to the present embodiment. In FIG. 3, MN 106 corresponds to upper layer processing section 113 of UE 101. A layer 107 indicates a wireless interface layer 1 in the UE 101, and a layer 108 indicates an interface layer 1 in the BS 104. The FA 109 corresponds to the upper layer processing unit 12 of the BS 104.

FIG. 3 describes a location registration procedure after UE 101 has handed over to BS 104. Here, when the UE performs a handover and the base station apparatus of the communication partner changes, the communication terminal apparatus generates a signal indicating the completion of the hand-over from the information of the wireless interface layer 1 in the communication terminal apparatus. In the following, an example in which the IP address is used in a mobility management method using an IP address will be described. As an example of the mobility management method, we will use RFC2002 "IP Mobility Support," to perform mobility management of mobile terminals.

First, the UE 101 switches from the BS 103 to the BS 104, ie, performs a handover, by moving from the BS 103 to the BS 104 by, for example, moving to an area where the BS 104 covers the communication.

Immediately after the handover, the route for transmitting the packet to the UE 101 is not updated, so even if the TE 105 transmits the packet to the UE 101, the packet is discarded because the 118-102 transmits the packet to the 88 103. You.

Therefore, UE 101 detects that the handover is completed in layer 108 and notifies the upper layer. Then, UE 101 performs processing higher than layer 1. When the handover is completed in the MN 106 that performs the process, the agent request is immediately transmitted to the FA of the BS 104 of the handover destination. Here, the upper layer indicates a layer higher than layer 1.

The FA of BS 104 receives the agent's request from UE 101: ^, sends an Agent Advertisement message to UE 101 separately from the periodic Agent Advertisement message transmission. Normally, the agent advertisement message is transmitted periodically. However, when the device of the present invention receives a request from the agent, the agent advertisement message is transmitted before the periodic transmission of the agent advertisement message. Here, the agent advertisement message is a message including the address of 83102 and the like. These processes are performed in FA 109 which performs higher-level processes than layer 1.

Upon receiving the agent advertisement message, the UE 101 immediately generates a location registration message including the IP address of the UE 101 and the IP address of the FA of the BS 104 serving as a new communication partner, and notifies the HA 102 of the location registration message. The HA 102 refers to the IP address of the UE 101 and the FA of the BS 104 to which the UE 101 belongs according to the location registration message.

The packet sent from TE 105 to UE 101 is received once by HA 102. The HA 102 calculates the FA of the base station device to which the UE 101 belongs from the destination IP address of the packet, and transfers the received packet to the FA 109 to which the UE 101 belongs. Then, FA 109 transfers the received packet to UE 101. Here, the FA 109 corresponds to the upper layer processing unit 132 of the BS 104.

Also, the packet sent from UE 101 to TE 105 is received by BS 104, and thereafter transferred to TE 105 according to the destination IP address of the packet. When transferring a packet from UE 101 to TE 105, FA 109 and HA 102 are not involved.

Through the above operation, packet communication can be performed between UE 101 and TE 105 even after handono. As described above, according to the base station apparatus and the communication terminal apparatus in the difficult form, it is detected that the handover is completed in the layer 1 of the communication terminal apparatus, and the handover is immediately performed from the communication terminal apparatus after the completion of the handover. After requesting the address information of the FA of the base iW device at the destination, and immediately receiving this address information, the communication terminal device immediately sends a location registration message to the HA, and the location registration message is sent from the completion of handover. It is possible to reduce a delay time until transmission of a packet, and reduce a packet loss addressed to the communication terminal device at the time of handover.

(Embodiment 2)

FIG. 4 is a block diagram showing an example of a configuration of a network including a base device according to Embodiment 2 of the present invention. However, components having the same configuration as in FIG. 2 are assigned the same reference numerals as in FIG. 2 and detailed description thereof is omitted.

The base station apparatus (BS303 and BS304) in FIG. 4 includes a detection unit 331, a detection unit 341, a higher layer processing unit 332, and a higher layer processing unit 342. However, the base device differs from the base devices (BS103 and BS104) in FIG. 2 in that it detects that the handover of the communication terminal device is completed.

Receiving section 13 1 receives a radio signal transmitted from the communication terminal apparatus, amplifies the radio signal, modulates and demodulates the radio signal to a baseband frequency, and decodes the signal. The obtained reception signal is processed by upper layer processing section 3 Output to 3 2 and detector 3 3 1

The detecting unit 3331 detects the completion of the handover from the communication with the UE 101, and notifies the upper layer processing unit 332 of the completion of the handover. When receiving the notification of the completion of the handover, the upper layer processing section 3332 sends an agent advertisement message to the UE 101. The upper layer processing unit 5332 performs processing equivalent to that of the upper layer processing unit 1332 in FIG.

In addition, the detecting unit 341 has the same function as the detecting unit 331, and the upper layer processing unit 342 has the same features as the upper layer processing 332.

Next, the operation of the network including the base station device according to the present embodiment will be described. UE 101 switches the communication partner from BS 303 to BS 304 by moving from the area where BS 303 covers communication to the area where BS 304 covers communication, that is, performs handover ^, immediately after handover, However, since the route for transmitting the packet to UE 101 has not been updated, even if the packet is transmitted to UE 101, the packet is discarded because HA 102 transmits the packet to BS 303.

Therefore, BS 304 detects that the handover has been completed in layer 1, and notifies the upper layer. Then, when the FA of the BS 304 verifies that the handover has been completed in the upper layer, it immediately transmits the agent advertisement message to the UE 101 of the communication partner.

Hereinafter, details of the above operation will be described. FIG. 5 is a sequence diagram showing an example of a communication procedure in a network including the base station device according to the present embodiment. In FIG. 5, MN 1 · 6 corresponds to upper layer processing section 113 of UE 101. Also, layer 107 indicates a radio interface layer 1 in UE 101, and layer 308 indicates a radio interface layer 1 in BS 304. The FA 309 corresponds to the upper layer processing unit 342 of the BS 304.

FIG. 5 describes a location registration procedure after UE 101 has handed over to BS 304. Here, when the UE performs a handover and the base of the communication partner: the device changes, a signal indicating that the handover is completed is generated from the information of the wireless interface layer 1 in the J1 device. The following describes an example in which is used in a mobility management method using an IP address.

The BS 304 detects that the communication partner has completed the handover in the layer 308, and notifies the FA 309. The FA 309 then immediately sends the UE 101 an Agent Advertisement message apart from the periodic Agent Advertisement Message Weekly. Normally, the agent advertisement message is transmitted periodically, but the base station apparatus of the present invention receives the notification of the completion of the handover from the layer 1: ^, before the transmission of the periodic agent advertisement message, Advertisement Send a message. Here, the agent advertisement message is a message including the IP address of FA304 of BS 304 and the like.

Upon receiving the agent advertisement message in MN 106, UE 101 immediately generates a location registration message including the IP address of UE 101 and the IP address of FA 309 of BS 304 as a new communication partner, and Notify 102. The HA 102 remembers the IP address of the UE 101 and the FA to which the UE 101 belongs according to the location registration message.

The packet sent from TE 105 to UE 101 is once received by HA 102. The HA 102 searches the destination IP address of the packet for the FA to which the UE 101 belongs, and transfers the received packet to the FA 309 to which the UE 101 belongs. Then, FA 309 transfers the received packet to UE 101.

Also, the bucket sent from UE 101 to TE 105 is received by BS 104, and thereafter, is transferred to TE 105 according to the destination IP address of the packet. When transferring a packet from UE 101 to TE 105, FA309 and HA102 are not involved.

As described above, according to the toya station device and the communication terminal device of the present embodiment, the handover destination base device determines that the handover is completed in layer 1 after the handover is completed. Detected and notified to the FA, the handset's 先 F crane device F immediately sends the FA address information to the communication terminal device, and the communication terminal device receives the address information and immediately registers its location. By transmitting the message to the HA, it is possible to reduce the delay time from the completion of the handover to the transmission of the location registration message, and to reduce the packet loss addressed to the communication terminal at the time of handover.

(Form 3 of difficulty)

FIG. 6 is a block diagram showing an example of the configuration of a network including the base crane device according to the third embodiment of the present invention. However, components having the same configuration as in FIG. 2 are assigned the same reference numerals as in FIG. 2 and detailed description thereof is omitted. The base station apparatus (BS 503 and BS 504) shown in FIG. 6 includes a detecting section 531 and a detecting section 541, and an upper layer processing section 532 and an upper layer processing section 542. In the base station apparatus, handover of a communication terminal apparatus is performed. 2 is different from the base station apparatus (BS 103 and BS 104) in FIG. 2 in that the base station apparatus performs location registration of the communication terminal apparatus to which the handover has been performed when the completion is completed.

Receiving section 131 receives a radio signal transmitted from the communication terminal apparatus, amplifies the radio signal, modulates and demodulates the radio signal to a baseband frequency, and decodes the signal. Output to section 532.

Detecting section 531 detects completion of handover from communication with UE 101, and notifies upper layer processing section 532 of completion of handover.

The upper layer processing unit 532, upon receiving the notification of the handover completion, generates a location registration message including the IP address of the communication terminal device and the IP address of the FA that newly communicates with the handover. , Output to the Neighborhood Quince Face 133. Further, the upper layer processing unit 532 performs the same processing as the upper layer processing unit 132 in FIG.

Further, detecting section 541 has the same function as detecting section 531, and upper layer processing section 542 has the same equipment as upper layer processing section 532.

Hereinafter, details of the above operation will be described. FIG. 7 is a sequence diagram showing an example of a communication procedure in a network including the base device of the present embodiment. In FIG. 7, # 106 corresponds to the upper layer processing unit 113 of U # 101. Layer 107 indicates the radio interface layer 1 in the UE 101, and layer 508 indicates the radio interface layer 1 in the BS 504. The FA 509 is aligned with the upper layer processing unit 542 of the BS 504.

FIG. 7 describes a location registration procedure after UE 101 has handed over to BS 504. Here, when the UE performs a node over and the base station apparatus of the communication partner changes, the base station apparatus generates a signal indicating handover completion from the information of the wireless interface layer 1 and this signal. Move using IP address An example in the case of using the management method will be described.

When notified by the layer 509 that the communication partner has completed the handover at the radio interface layer 1, the FA 509 of the BS 504 generates a location registration message including the IP address of the UE 101 and the IP address of the FA 509. Notify 102. The HA 102 stores the IP address of UE1-1 and the FA to which the UE 101 belongs according to the location registration message.

The packet sent from TE 105 to UE 101 is received once by HA 102. The HA 102 searches the destination IP address of the packet for the FA to which the UE 101 belongs, and transfers the received packet to the FA 509 to which the UE 101 belongs. Then, FA 509 transfers the received packet to UE 101.

Also, the packet sent from UE 101 to TE 105 is received by BS 504, and thereafter transferred to TE 105 according to the destination IP address of the packet. When transferring a packet from UE 101 to TE 105, UE 101, FA 509 and HA 102 are not involved.

As described above, according to the ¾¾J1 apparatus and the communication terminal apparatus of the present embodiment, the handover destination base device detects that the handover is completed in layer 1 after the handover is completed. The FA of the handover destination is notified to the FA, and the FA of the base device of the handover destination immediately sends a location registration message to the HA, so that the delay time from the completion of the handover to the transmission of the location registration message is reduced. Therefore, the packet loss addressed to the communication terminal device at the time of handover can be reduced.

(Embodiment 4)

FIG. 8 is a block diagram showing an example of a configuration of a network including a base device according to Embodiment 4 of the present invention. However, components having the same configuration as in FIG. 2 are assigned the same reference numerals as in FIG. 2 and detailed description thereof is omitted.

When the communication terminal device (UE 701) in FIG. 8 determines to execute the handover, it transmits a request for an agent advertisement message to the base station device, and the base device; (BS 703 and BS 704) are the base stations that perform communication before handover when the communication terminal (UE) decides to perform handover: It differs from the communication terminal device (UE 101) and the base device (BS 103 and BS 104) in FIG. 2 in that information such as the FA IP address of the device is acquired and an agent advertisement message is transmitted to the communication terminal device.

The UE 701 is a communication terminal device that implements a mobile IP network function and a wireless interface layer 1 function defined in RFC 2002, similar to the UE 101 in FIG.

The UE 701 mainly includes a receiving section 711, a detecting section 712, an upper layer processing section 713, and a transmitting section 714. Receiving section 711 receives a radio signal transmitted from BS 703 or BS 704, amplifies the radio signal, converts the radio signal to a baseband frequency, demodulates and decodes the signal, and detects the obtained received signal as a detecting section 712. Is output to the upper layer processing unit 713.

Detecting section 712 detects execution of handover from the received signal, and notifies upper layer processing section 713 of executing handover.

Upper layer processing section 713 is in charge of processing of a received signal in a layer higher than layer 1. Further, when the upper layer processing unit 713 receives the promptness of the handono execution, it outputs a request for an agent advertisement message to the transmission unit 714. Then, the upper layer processing unit 713 generates a location registration message including the IP address of its own station and the IP address of the FA of the device that performs communication after the handover, and outputs it to the transmission unit 714.

The transmitting unit 714 performs a request for the data and agent advertisement message output from the upper layer processing unit 713, encodes, modulates, and converts the position registration message into a radio frequency, amplifies the signal, and transmits the signal as a radio signal. .

The HA 102 performs the same processing as the HA 102 in FIG.

BS 703 and BS 704 perform the same processing as BS 103 and BS 104 in FIG. The TE 105 communicates with the UE 701 to transmit and receive packets.

Next, the operation of the network including the base device according to the present embodiment will be described. FIG. 9 is a sequence diagram showing an example of a communication procedure in a network including the i-station apparatus of the present embodiment. In FIG. 9, MN 706 corresponds to an upper layer process # 713 of UE 701. A layer 707 indicates a wireless interface layer 1 in the UE 701, and a layer 738 indicates a wireless interface layer 1 in the BS 703. The FA 739 corresponds to the upper layer processing unit 732 of the BS 703. Similarly, layer 748 indicates the wireless interface layer 1 in BS704. The FA 749 corresponds to the upper layer processing unit 742 of the BS 704.

FIG. 9 illustrates a location registration procedure when UE 701 determines to handover a communication partner from BS 703 to BS 704. Here, the UE decides to perform a handover, and when the communication partner device changes, a signal indicating a handover execution decision is generated from the information of the wireless interface layer 1 in the communication terminal device, and this signal is generated. An example of ^ used in the mobility management method using an IP address will be described.

First, UE 701 determines to switch the communication partner from BS 703 to BS 704, that is, to perform a handover.

Next, the UE 701 instructs the MN 706 to perform handover in the layer 707 before handover. Then, the MN 706 of the UE 701 transmits to the FA 739 of the currently communicating BS 703 using the agent request message that handover is to be performed immediately.

When receiving the notification of handover from UE 701, 83703-8739 communicates with FA 749 of BS 704 of the handover destination to acquire the IP address of FA 704 of BS 704. Then, the FA 703 9 of the BS 703 creates an agent advertisement message including the IP address of the FA 749 of the BS 704 of the handover destination, and transmits a typical agent advertisement message. Separately transmits an agent advertisement message to MN706 of UE 701. Usually, the agent advertisement message is transmitted periodically. However, when the base station apparatus of the present invention receives the request for the agent advertisement message, the base station apparatus transmits the agent advertisement message before the periodic transmission of the agent advertisement message. Send the advertising message. Here, the agent advertisement message is a message including the IP address of FA749 of BS 704 and the like.

Upon receiving the agent advertisement message, the MN 706 of the UE 701 immediately generates a location registration message including the IP address of the UE 701 and the IP address of the FA749 of the BS 704 as a new communication partner, and Notify 102. The HA 102 memorizes the IP address of the UE 701 and the FA to which the UE 701 belongs in accordance with the location registration message.

The packet sent from TE 105 to UE 701 is once received by HA 102. The HA 102 searches the destination IP address of the packet for the FA to which the UE 701 belongs, and transfers the received packet to the FA 749 to which the UE 701 belongs. Then, FA 749 transfers the received packet to UE 701.

Also, the packet sent from UE 701 to TE 105 is received by BS 704, and then transferred to TE 105 according to the destination IP address of the packet. When forwarding a packet from UE 701 to TE 105, FA749 and HA 102 are not involved.

As described above, packet communication can be performed between UE 701 and TE 105 even after handover.

As described above, according to the base station apparatus and the communication terminal apparatus of the present embodiment, it is detected that execution of handover is performed in layer 1 of the communication terminal apparatus, notified to the FA, and executed before execution of the handover. The communication terminal requests the address information of the FA of the handover destination base station, and the communication terminal immediately sends a location registration message to the HA immediately after receiving the address information. It is possible to reduce the delay time before sending a recording message, Packet loss addressed to the communication terminal device can be reduced.

(Embodiment 5)

FIG. 10 is a block diagram showing an example of the configuration of a network including a base device 1 according to Embodiment 5 of the present invention. However, components having the same configuration as in FIG. 8 are denoted by the same reference numerals as in FIG. 8, and detailed description is omitted.

The base station apparatus (BS 903 and BS 904) in FIG. 10 includes a detection section 931 and a detection section 941, and an upper layer processing section 932 and an upper layer processing section 942. It differs from the base station devices (BS703 and BS704) in FIG. 8 in that the base {j} device detects handover execution of the communication terminal device.

Receiving section 731, receives a wireless signal transmitted from the communication terminal apparatus, amplifies the wireless signal, modulates and demodulates the signal to a baseband frequency, and decodes, and detects the obtained received signal to detect section 931 Is output to the upper layer processing section 932.

Detecting section 931 detects execution of handover from communication with UE701, and notifies upper layer processing section 932 of executing handover. The upper layer processing unit 932 communicates with the BS 904 of the handover destination, acquires the IP address of the FA of the BS 904, etc., and obtains 1/8 of the BS 904 of the handover destination. It creates an agent advertisement message including a cascade address and outputs it to the transmission section 734. Then, the upper layer processing unit 932 is required to generate an agent advertisement message such as an IP address of the FA of the own station requested by another fiber station device ^ and an IP address of the requested FA. Output important information. The upper layer processing unit 932 performs processing equivalent to that of the upper layer processing unit 732 in FIG.

Next, the operation of the network including the base device according to the present embodiment will be described. FIG. 11 is a sequence diagram showing an example of a communication procedure in a network including the base device according to the present embodiment. In FIG. 11, ΜΝ706 corresponds to the upper layer processing unit 713 of the UE 7-1. Further, layer 707 indicates a non-fountain in-face layer 1 in the UE 701, and layer 938 indicates a wireless in-face layer 1 in the BS 903. And FA 939 is BS 9 03 Corresponding to the upper layer processing unit 932. Similarly, layer 948 represents the Muizumi Inn Yuichi Face Layer 1 in BS904. The FA949 corresponds to the upper layer processing unit 942 of the BS904.

In FIG. 11, UE 701 has decided to handover from BS 903 to BS 904: The location registration procedure of ^ will be described. Here, the UE decides to perform handover, and when changing the base TO device of the communication partner, the base; 決定 The device decides to perform handover based on the 'I' A signal is generated to indicate that this has been done, and this signal is used in a mobility management method using an IP address: An example of ^ will be described.

When notified of a communication terminal node over from layer 938, FA 939 of BS 903 communicates with FA 949 of BS 904 at the handover destination and acquires the IP address of FA 949 of BS 904. The FA 939 of BS 903 creates an agent advertisement message including the IP address of the FA 949 of the handover destination BS 904, and sends the agent advertisement message separately from the regular agent advertisement message transmission. To UE 701. Normally, the agent advertisement message is transmitted periodically, but the FA of the base station apparatus of the present invention receives the notification of the handover decision from the layer 1: ^, the periodic agent advertisement message The agent advertisement message is transmitted before the transmission timing. Here, the agent advertisement message is a message including the IP address of FA904 of BS904.

Upon receiving the agent advertisement message, UE 701 immediately generates a location registration message including the IP address of UE 701 and the IP address of FA949 of BS 904 as a new communication partner, and notifies HA 102 of the location registration message. The HA 102 stores the IP address of the UE 701 and the FA to which the UE 701 belongs according to the location registration message. Also, since the HA 102 stores the current FA of the UE 701 and the FA of the handover destination, the received packet may be multicast to the FA 939 and the FA 949. The packet sent from TE 105 to UE 701 is once received by HA 102. The HA 102 searches for the FA to which the UE 701 belongs from the destination IP address of the packet, and transfers the received packet to the FA 949 to which the UE 701 belongs. Then, FA949 transfers the received packet to UE 701.

Also, the packet sent from UE 701 to TE 105 is received by BS 904, and thereafter transferred to TE 105 according to the destination IP address of the packet. FA949 and HAl02 are not involved when forwarding packets from UE 701 to TE 105.

As described above, according to the mobile station device and the communication terminal device of the present embodiment, before executing the handover, the handover source base station device immediately transmits the FA address information of the handover destination base station device. And transmits the agent advertisement message to the communication terminal device.After the communication terminal device receives this agent advertisement message, it immediately sends a location registration message to the terminal, so that the location registration is completed after the handover is completed. The time until message transmission can be reduced, and packet loss addressed to the communication terminal device during handover can be reduced.

(Form 6 of difficulty)

FIG. 12 is a block diagram showing an example of a configuration of a network including a base {J} device according to Embodiment 6 of the present invention. However, components having the same configuration as in FIG. 8 are denoted by the same reference numerals as in FIG. 8, and detailed description is omitted.

The base station apparatus (BS 1103 and BS 1104) shown in FIG. 12 includes a detecting unit 1131, a detecting unit 1141, an upper layer processing unit 1 132, and an upper layer processing unit 1142. When detecting that the communication terminal device executes the handover, the base device substitutes for the location registration of the communication terminal device to which the handover has been performed, which is different from the base devices (BS 703 and BS 704) in FIG.

Receiving section 731 receives the radio signal transmitted from the communication terminal apparatus, amplifies the radio signal, modulates and demodulates the radio signal to a baseband frequency, and decodes the signal. Output to layer processing section 1132. Detecting section 1131 detects that handover is to be performed from communication with UE 701, and notifies upper layer processing section 1132 that UE 701 is to perform handover.

When notified of the execution of the handono, the upper layer processing unit 1132 communicates with the BS 1104 of the handover destination, acquires the IP address of the FA of the BS 1104, etc., and obtains the IP address of the communication terminal and the BS 1104 of the handover destination. A location registration message including the FA's IP address is created and output to the net login evening interface 33.

Then, when another base station apparatus requests the IP address of its own FA from another base station apparatus, the upper layer processing section 1132 outputs information necessary for creating a location registration message such as the requested IP address. The upper layer processing unit 1132 performs the same processing as that of the upper layer unit 732 in FIG.

Hereinafter, details of the above operation will be described. FIG. 13 is a sequence diagram showing an example of a communication procedure in a network including the base station device according to the present embodiment. In FIG. 13, the location registration procedure when 11 位置 701 decides to perform handover from: 631103 to 881104 will be described. Here, when the UE performs a handover and the base device of the communication partner changes, a signal indicating that the base crane device has decided to perform a handover based on information of the wireless interface layer 1 is transmitted. An example of generating and using this signal in a mobility management method using an IP address will be described.

The FA 1139 of the BS 1103 communicates with the FA 1149 of the BS 1104 of the handover destination notified of the handover ^ from the wireless interface layer 1 and acquires the IP address of the FA 1149 of the BS 1104. Then, the FA 1139 of the BS 1103 generates a location registration message including the IP address of the UE 701 and the IP address of the FA 1149 of the BS 1104 of the handover destination, and notifies the HA 102 of the location registration message. HA 1 • 2 stores the IP address of UE 701 and UE 701 belonging to: FA according to the location registration message. The packet sent from TE 105 to UE 701 is once received by HA 102. The HA 102 searches for the FA to which the UE 701 belongs from the destination IP address of the packet, and transfers the received packet to the FA 1149 to which the UE 701 belongs. Then, FA 1149 transfers the received packet to UE 701.

The packet sent from UE 701 to TE 105 is received by BS 1104, and then transferred to TE 105 according to the destination IP address of the packet. When forwarding a packet from UE 701 to TE 105, FA1149 and HA 102 are not involved.

As described above, according to the base device and the communication terminal device of the present embodiment, before executing the handover, the base device of the handover source immediately transmits to the base station device of the handover destination. By acquiring the address of the F address and immediately transmitting the location registration message from the handover source device to the HA, the time from handover completion to transmission of the location registration message can be reduced. Packet loss addressed to the communication terminal device during handover can be reduced.

In Embodiments 1 to 3 of {5}, an example will be described in which a signal indicating completion of handover is generated in wireless interface layer 1 and this signal is used as a trigger to register the position of a communication terminal device. However, instead of the wireless interface layer 1, the radio resource control function (RRC), which releases the connection Z of the wireless line, uses the information of the wireless interface layer 1 to transfer to a new wireless station. Information indicating that the handover has been completed may be generated, and the position of the communication terminal device may be registered using this signal as a trigger.

Similarly, in Difficult Modes 4 to 6, instead of the wireless interface layer 1, the radio resource control function (RRC) that releases the connection Z of the wireless line uses the information of the wireless interface layer 1. Information indicating that handover to a new wireless base station may be generated based on this signal, and the position of the communication terminal device may be registered using this signal as a trigger.

In addition, the information of the wireless interface layer 1 that determines the execution of handover is For example, it is possible to use reception power, a desired signal power to interference power ratio (SIR: Signa 1 Interface Ratio) value, synchronization state information, and the like.

Also, as the information of the wireless interface layer 1 that determines the execution of the handover, a Bindng Updating signal that is a signal for changing a communication path in the network can be used.

In addition, the foreign agent part that performs the processing of the upper layer in the key station device of the present invention is separated from the base station device and mounted on another device, and is connected to the wireless interface layer of the base station device. Communication may be performed.

Further, in the embodiment of the present invention, it is described that the agent advertisement message is transmitted periodically. However, the configuration may be such that the periodic agent advertisement message is not transmitted.

Further, in the examples of the invention, RFC2002 is described as an example, but Mobile IPv6 (draft-ietf-mipv6) corresponding to IP version 6 may be used. When the communication terminal device of the present invention performs a handover, either a hard handover or a soft handover can be applied.

It should be noted that the present invention is not limited to the above-described embodiment, and it is possible to make various changes to be difficult. For example, in the above difficult embodiment, the case where the MN, FA, and HA of RFC2002 are performed as a device is described, but the present invention is not limited to this, and it is also possible to perform these as software.

For example, a program for executing the above MN, FA, and HA may be stored in a ROM (Read Only Memory) in advance, and the program may be operated by a CPU (Central Processor Unit).

In addition, the program for executing the above MN, FA, and HA is stored in a computer-readable storage medium, and the program stored in the storage medium is recorded in a RAM (Random Access Memory) of the computer, so that the program can be viewed on a computer. You may make it operate according to the program. As is apparent from the above description, according to the communication device, the communication terminal device, and the communication method of the present invention, when the communication terminal device performs handover, the local station device periodically transmits an agent advertisement message. Before transmitting, that is, immediately after the handover is completed, an agent advertisement message is immediately transmitted to the communication terminal device, and routing for transmitting a packet to the communication terminal device after the handover is determined. It is possible to reduce the packet transmission loss by reducing the location registration M of the device. The present specification is based on Japanese Patent Application No. 2001-376669 filed on December 11, 2001. This content is included here. Industrial applicability

The present invention is suitable for use in communication to which Mobile IP is applied.

Claims

The scope of the claims

A communication method that obtains new information during communication from the wireless interface layer 1 when switching communication relay stations in communication using the mobility management method that uses the IP address.

2. In communication using the mobility management method using an IP address, when switching communication ©, before switching communication iii from the wireless communication interface layer 1 to the new communication information of Nakajima 通信2. The communication method according to claim 1, wherein the communication method is acquired.

3. The communication method according to claim 1, wherein switching of M during communication from the wireless interface layer 1 is detected.

4. The communication method according to claim 1, wherein an instruction to change a communication path is made before switching a communication relay station.

5. The communication method according to claim 1, wherein an instruction to change a communication path is made after switching a communication relay station.

6. The communication method according to claim 1, wherein the communication terminal device instructs a change of communication.

7. The communication method according to claim 1, wherein during communication is instructed to change the communication path.

8. When the communication terminal changes the wireless base station of the communication destination, it is characterized by soft handover in which the communication terminal moves from one base station to another without continuing communication with multiple base stations at the same time. The communication method according to claim 1.

9. The communication method according to claim 1, wherein the communication terminal device multicasts a packet to a plurality of wireless base stations including a wireless terminal that communicates and a wireless terminal that is a new communication destination.

10. Detecting means for detecting execution of handover of the communication terminal device, and transmission for transmitting information necessary for registering the position of the communication terminal device after the handover to the base station device when performing the handover. A communication device comprising:

II. The communication device according to claim 10, wherein said information is an agent advertisement message including information on its own station.

12. The communication device according to claim 10, wherein the information is location registration information including information on a communication terminal device, handono, and information on a communication device that performs communication later.

13. The communication device according to claim 10, wherein the information is a request for an agent advertisement message including information on a communication device at a handover destination. 14. The communication device according to claim 10, wherein the detection means detects handover execution from processing in a physical layer of the own station.

15. The communication device according to claim 10, wherein the detection means detects hand-on execution from a signal transmitted from a communication partner.

16. The detecting means according to claim 10, wherein the detecting means detects that the handover of the communication terminal device is completed, and the transmitting means transmits an agent advertisement message immediately after the completion of the node. Communication device.

17. The communication device according to claim 10, wherein the detection means detects that the handover of the communication terminal device is completed, and the transmission means transmits the location registration information immediately after the completion of the handover. .

18. The detecting method according to claim 10, wherein the detecting means detects that the handover of the communication terminal device is completed, and the transmitting means transmits a request for an agent advertisement message immediately after the completion of the handover. Communication device.

19. The detecting means detects that the execution of the handover of the communication terminal device is determined, and the transmitting means transmits the agent advertisement message immediately after determining the execution of the handover. The communication device according to item.

20. The method according to claim 10, wherein the detecting means detects that the execution of the handover of the communication terminal apparatus is determined, and the transmitting means transmits the location registration information immediately after determining the execution of the handover. Communication device.

21. The detecting method according to claim 10, wherein the detecting means detects that the execution of the handover of the communication terminal apparatus is determined, and the transmitting means transmits a request for the agent advertisement message immediately after determining the execution of the handover. The communication device according to item.

2. When the communication terminal changes the wireless base station of the communication destination, the communication terminal 10. The communication device according to claim 10, wherein the communication device is a soft handover that moves to a wireless base station while communicating with a plurality of wireless base stations.

23. The wireless communication system according to claim 10, wherein the packet is multicast to a plurality of wireless base stations including a wireless base station β serving as a new communication destination and a wireless base station serving as a new communication destination. Communication device.