Source: http://www.google.com/patents/US20040131061?dq=7,812,828
Timestamp: 2014-09-18 05:49:47
Document Index: 168048163

Matched Legal Cases: ['art 106', 'art 109', 'art 101', 'art 101', 'art 101', 'art 101', 'art 103', 'art 101', 'art 101', 'art 103', 'art 101', 'art 170', 'art 101', 'art 103', 'art 103', 'art 170', 'art 170', 'art 103', 'art 101', 'art 103', 'art 103', 'art 170', 'art 103', 'art 104', 'art 104', 'art 104', 'art 104', 'art 103', 'art 103', 'art 170', 'art 104', 'art 104', 'art 104', 'art 103', 'art 103', 'art 170', 'art 104', 'art 104', 'art 106', 'art 106', 'art 109', 'art 104', 'art 104', 'art 104', 'art 104', 'art 304', 'art 304', 'art 304', 'art 170', 'art 170', 'art 170', 'art 304', 'art 106', 'art 170', 'art 170', 'art 170', 'art 170', 'art 170', 'art 170', 'art 170', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 104', 'art 104', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 106', 'art 304', 'art 304', 'art 101', 'art 103', 'art 104', 'art 106', 'art 304', 'art 101', 'art 103', 'art 103', 'art 104', 'art 103', 'art 104', 'art 103', 'art 104', 'art 103']

Patent US20040131061 - Packet communication terminal, packet communication system, packet ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA packet communication terminal is provided without delay in packet communication between the packet communication terminal moving between different networks, and a correspondent packet communication terminal. The packet communication terminal comprises network address acquiring part, network address...http://www.google.com/patents/US20040131061?utm_source=gb-gplus-sharePatent US20040131061 - Packet communication terminal, packet communication system, packet communication method, and packet communication programAdvanced Patent SearchPublication numberUS20040131061 A1Publication typeApplicationApplication numberUS 10/664,854Publication dateJul 8, 2004Filing dateSep 22, 2003Priority dateSep 19, 2002Also published asCN1297169C, CN1492716A, DE60332306D1, EP1401162A2, EP1401162A3, EP1401162B1, EP1401162B9Publication number10664854, 664854, US 2004/0131061 A1, US 2004/131061 A1, US 20040131061 A1, US 20040131061A1, US 2004131061 A1, US 2004131061A1, US-A1-20040131061, US-A1-2004131061, US2004/0131061A1, US2004/131061A1, US20040131061 A1, US20040131061A1, US2004131061 A1, US2004131061A1InventorsHosei Matsuoka, Takeshi Yoshimura, Tomoyuki OhyaOriginal AssigneeNtt Docomo, Inc.Export CitationBiBTeX, EndNote, RefManReferenced by (16), Classifications (12), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetPacket communication terminal, packet communication system, packet communication method, and packet communication programUS 20040131061 A1Abstract A packet communication terminal is provided without delay in packet communication between the packet communication terminal moving between different networks, and a correspondent packet communication terminal. The packet communication terminal comprises network address acquiring part, network address storage, network address notifying part, and packet receiver. When there exist a plurality of networks to which the packet communication terminal can be connected, the network address acquiring part acquires a plurality of network addresses from the respective networks. The network address storage stores the plurality of network addresses. The network address notifying part notifies the correspondent packet communication terminal of the plurality of network addresses. The packet receiver receives packets generated from identical data and sent from the correspondent packet communication terminal to the respective network addresses. Images(19) Claims(22)
DESCRIPTION OF THE PREFERRED EMBODIMENTS [0085] Packet communication system 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing the configuration of packet communication system 1. Packet communication system 1 according to the present embodiment is comprised of packet communication terminal (first packet communication terminal) 10, packet communication terminal (second packet communication terminal) 30, network 50 with base station 51, network 70 with base station 71, and switching center 80. [0086] Network 50 is a network having a plurality of base stations including base station 51, and the base station 51 is connected through a link to switching center 80. Network 70 is a network having a plurality of base stations including base station 71, and is connected through a link to switching center 80. [0087] Each of base station 51 and base station 71 is wirelessly connected to packet communication terminal 10 present in the range of communication area 52 and communication area 72, and operates to transmit and receive packets to and from packet communication terminal 10. [0088] Switching center 80 is comprised of a router or the like and implements relaying in packet communication between packet communication terminal 30 and packet communication terminal 10. [0089] Packet communication terminal 10 will be described below. Packet communication terminal 10 is a mobile packet communication terminal carried by a user like the mobile communication terminals, cell phones, and so on. Packet communication terminal 10 is physically equipped with an input device such as push buttons, a display unit such as a display device, a CPU (central processing unit), a storage device such as a memory, a communication device, and so on. [0090] The functional configuration of packet communication terminal 10 will be described below. FIG. 2 is a block diagram showing the functional configuration of packet communication terminal 10. Packet communication terminal 10 is functionally comprised of network address acquiring part (network address acquiring means) 101, network address storage (network address storing means) 102, network address notifying part (network address notifying means, ineffective network address notifying means, effective network address notifying means, and communication state notifying means) 103, radio wave intensity measuring part (radio wave intensity measuring means) 104, packet receiver (first packet receiving means) 105, data reconstruction part 106, audio-video decoder 107, audio-video encoder 108, data dividing part 109, packet generator (first packet generating means) 110, redundant packet generator (first redundant packet generating means) 111, and packet transmitter (first packet transmitting means) 112. Each of these components will be described below in detail. [0091] The network address acquiring part 101 is configured as follows. Packet communication terminal 10 detects a network to which it can be connected at its current location. Then the network address acquiring part 101 acquires a network address assigned by the detected network and makes the network address storage 102 store the network address. For example, in the case where packet communication terminal 10 is located in communication area 52 of base station 51, it acquires a network address assigned to the packet communication terminal 10 by network 50. When packet communication terminal 10 further moves from this location to a location where it is included in both communication area 52 of base station 51 and communication area 72 of base station 71, the network address acquiring part 101 further acquires another network address from network 70. [0092] Network address storage 102 is a storage part constructed on a memory for memorizing network addresses acquired by network address acquiring part 101. Alternatively, network address storage 102 may be a database constructed on a hard disk. [0093] Network address notifying part 103 notifies correspondent packet communication terminal 30 of a network address acquired by the network address acquiring part 101. For example, in the case where packet communication terminal 10 is located in communication area 52 of base station 51, it notifies packet communication terminal 30 of a network address acquired from network 50 by network address acquiring part 101. When packet communication terminal 10 further moves from this location to a location where it is included in both communication area 52 of base station 51 and communication area 72 of base station 71, the network address notifying part 103 further notifies packet communication terminal 30 of a network address acquired from network 70 by network address acquiring part 101. [0094] Let us explain herein the configuration of packets used in notification of the network address and transmission of data by packet communication terminal 10 as described above, with reference to FIG. 3. FIG. 3 shows the configuration of packet 150 used in packet communication according to the present embodiment. FIG. 3 shows the configuration of packet 150 consisting of the header of the transport layer, which was newly designed by Inventors of the present invention so as to suit the use in packet communication according to the present embodiment, and data part. In the present specification, the header of the transport layer will be called an �MMSP header.� As shown in FIG. 3, the MMSP header is provided with various fields such as source port number field 151, destination port number field 152, flag field 160, and so on. The source port number field 151 and destination port number field 152 are provided for storage of a port number indicating a type of an application protocol. Namely, a numeral indicating a type of an application protocol for the packet communication according to the present embodiment is stored in those fields. Flag field 160 consists of DATA field 161, FEC field 162, GOOD_ADDRESS field 163, ADD_ADDRESS field 164, and DELETE_ADDRESS field 165. The data part 170 subsequent to this MMSP field is provided for storage of data to be transmitted in the form of packets. [0095] For notifying correspondent packet communication terminal 30 of a network address acquired by network address acquiring part 101, as described above, the network address notifying part 103 puts �1� in ADD_ADDRESS field 164 of the MMSP header. Then the network address notifying part 103 stores data of the format shown in FIG. 4, into data part 170. FIG. 4 shows the data to be stored in data part 170 used in the notification of the network address to the packet communication terminal 30. On the occasion of the aforementioned notification of the network address, as shown in FIG. 4, network address notifying part 103 puts a type of an address in address type field 171. For example, a numeral indicating a network address of IPv4 or IPv6 is stored in address type field 171. A numeral indicating a length of the network address notified of is stored in address length field 172. For example, �32� indicating the address length of 32 bits in the case of IPv4, or �128� indicating the address length of 128 bits in the case of IPv6 is stored in address length field 172. The network address associated with the aforementioned notification is stored in network address field 173. [0096] For notifying packet communication terminal 30 of the network address acquired by the network address acquiring part 101, the network address notifying part 103 generates a packet of the configuration as described above, and transmits the packet to packet communication terminal 30. [0097] When packet communication terminal 10 becomes no longer able to stay connected to a network presently under connection, the network address notifying part 103 puts a network address acquired from the network, in the form of the data of structure shown in FIG. 4, into data part 170 of packet 150, puts 37 1� in DELETE_ADDRESS field 165 of the MMSP header, and sends the packet to packet communication terminal 30. Packet communication terminal 10 deletes this network address from network address storage 102. [0098] The network address notifying part 103 also performs the following processing on the basis of an instruction from radio wave intensity measuring part 104. Now, referring back to FIG. 2, the radio wave intensity measuring part 104 will be described. The radio wave intensity measuring part 104 measures intensities of radio waves from respective networks to which packet communication terminal 10 is connected. The radio wave intensity measuring part 104 is configured so that when a maximum intensity out of a plurality of intensities measured is not less than a predetermined threshold (first predetermined threshold), it detects a network including a base station having transmitted the radio wave of the maximum intensity. Then it outputs a network address acquired from the detected network and stored in network address storage 102, to network address notifying part 103. Receiving this output, network address notifying part 103 puts �1� into GOOD_ADDRESS field 163 of the MMSP header, and sends packet 150 with data part 170 storing data consisting of the network address from the radio wave intensity measuring part 104, to packet communication terminal 30. In this case, the radio wave intensity measuring part 104 controls packet transmitter 112 so as to send packets to only the network including the base station having transmitted the radio wave of the maximum intensity. [0099] When all the intensities of the radio waves measured are smaller than a predetermined threshold (second predetermined threshold), the radio wave intensity measuring part 104 outputs this fact to network address notifying part 103. Receiving this output, network address notifying part 103 puts �1� in GOOD_ADDRESS field 163 of the MMSP header, and sends packet 150 of structure with no designated network address in data part 170 to packet communication terminal 30. In this case, the radio wave intensity measuring part 104 controls packet transmitter 112 so as to send packets generated from data to be transmitted to the packet communication terminal 30, to all the networks to which packet communication terminal 10 is connected. The two predetermined thresholds (the first predetermined threshold and the second predetermined threshold) used by radio wave intensity measuring part 104 may be identical to each other, or may be different values. [0100] Packet receiver 105 receives a packet transmitted from packet communication terminal 30. When a plurality of network addresses are stored in network address storage 102, the packet receiver 105 receives all packets transmitted to these network addresses, as packets addressed to the packet communication terminal 10. Data reconstruction part 106 reconstructs data from the packets received by packet receiver 105. Audio-video decoder 107 decodes the data reconstructed by data reconstruction part 106, into audio and/or video data. [0101] Audio-video encoder 108 encodes audio and/or video data to be transmitted from packet communication terminal 10 to packet communication terminal 30, to generate encoded data. Data dividing part 109 divides this encoded data into divisional data, for packetizing the data generated by audio-video encoder 108. [0102] Packet generator 110 adds an MMSP header to each of the above divisional data to generate packets. At this time, packet generator 110 puts �1� in DATA field 161 of the MMSP header to indicate that this packet is constructed from data. [0103] Redundant packet generator 111 generates redundant data by forward error correction codes from the above divisional data and adds an MMSP header to each of the redundant data to generate redundant packets. At this time, redundant packet generator 111 puts �1� in FEC field 162 of the MMSP header, thereby indicating that this packet contains redundant data by forward error correction codes. Here the redundant packet generator 111 generates redundant packets by the number according to the number of networks to which packet communication terminal 10 is connected. For example, when packet communication terminal 10 is connected to two networks, it generates K redundant packets, corresponding to the number of divisional data, K. The packet communication terminal 10 distributes and transmits the redundant packets generated in this way, and the packets generated by the packet generator 110, to the two networks, and the packet communication terminal 30 can reconstruct the data by receiving either the K packets or redundant packets out of these packets and redundant packets. When the maximum intensity of the radio wave out of those measured by radio wave intensity measuring part 104 is not less than the predetermined threshold, packet communication terminal 10 sends the packets to only the network including the base station having transmitted the radio wave, as described above; in this case, therefore, redundant packet generator 111 generates no redundant packet. [0104] Packet transmitter 112 further adds an IP header to each of the packets generated by packet generator 110 and to each of the redundant packets generated by the redundant packet generator 111. Then the packet transmitter 112 transmits the packets each with the IP header to packet communication terminal 30. In this transmission, where packet transmitter 112 is controlled by radio wave intensity measuring part 104 so as to send packets to the network including the base station having transmitted the radio wave of the maximum intensity as described above, it sends the packets generated by the packet generator 110, to only the relevant network. On the other hand, when all the intensities of the radio waves measured by the radio wave intensity measuring part 104 is smaller than the predetermined threshold, packet transmitter 112 is controlled so as to send the packets to all the networks to which the packet communication terminal 10 is connected, by an instruction from radio wave intensity measuring part 104; in that case, packet transmitter 112 distributes and transmits the packets and redundant packets each with the IP header as described above, to the networks to which the packet communication terminal 10 is connected. On the occasion of this distribution, packet transmitter 112 transmits the packets while storing network addresses acquired from the respective networks, as source addresses of the IP header, according to the networks to which the above packets and redundant packets are to be transmitted. [0105] Now the processes executed by the respective parts of audio-video encoder 108, data divider 109, packet generator 110, redundant packet generator 111, and packet transmitter 112 will be described below with reference to FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5D, and FIG. 5E. First, as shown in FIG. 5A, audio-video encoder 108 encodes audio data, video data, or the like to generate data 201 to be transmitted to packet communication terminal 30. This process (reference numeral 200) is a process executed in the application layer level. Next, as shown in FIG. 5B, data divider 109 divides data 201 to generate a plurality of divisional data 211-214. Presented here is an example in which four divisional data 211-214 are generated from data 201. Next, as shown in FIG. 5C, redundant packet generator 111 generates redundant data 215-218 by forward error correction codes from the divisional data 211-214. Presented here is an example in which four redundant data are generated. Then, as shown in FIG. 5D, packet generator 110 and redundant packet generator 111 add MMSP headers 221-228 to divisional data 211-214 and to redundant data 215-218, respectively. The processes (reference numeral 210) shown in FIGS. 5B, 5C, and 5D are processes each executed in the transport layer level. Thereafter, as shown in FIG. 5E, packet transmitter 112 adds IP headers 241-248 to the respective packets with the MMSP headers and then sends these packets with the IP headers to networks. This process (reference numeral 240) shown in FIG. 5E is a process executed in the network layer level. [0106] Described next is packet communication terminal 30 as a correspondent to packet communication terminal 10. Packet communication terminal 30 is a packet communication terminal capable of performing packet communication like the personal computers. In the present embodiment, the packet communication terminal 30, different from packet communication terminal 10, is not based on the premise of migration and is connected to one network. The packet communication terminal 30 can also be a mobile packet communication terminal like the mobile communication terminals and others if it is comprised of the after-described components of packet communication terminal 30 and the aforementioned functional components of packet communication terminal 10. [0107] The packet communication terminal 30 is physically comprised of a CPU (central processing unit), a storage device such as a memory, a storage device such as a hard disk, an input device such as a keyboard and a mouse, a display device such as a display unit, a communication device, and so on. [0108]FIG. 6 is a block diagram showing the functional configuration of packet communication terminal 30. The packet communication terminal 30, as shown in FIG. 6, is functionally comprised of packet receiver (second packet receiving means) 301, received packet discrimination processor 302, destination network address storage (destination network address storing means) 303, data reconstruction part 304, audio-video decoder 305, audio-video encoder 306, data divider 307, packet generator (second packet generating means) 308, redundant packet generator (second redundant packet generating means) 309, and packet transmitter (second packet transmitting means) 310. Each of the components will be described below in detail. [0109] Packet receiver 301 receives a packet transmitted from correspondent packet communication terminal 10 and outputs it to received packet discrimination processor 302. [0110] Received packet discrimination processor 302 receives the packet from packet receiver 301. Then it performs the following processing with reference to flag field 160 in the MMSP header of this packet. When �1� is stored in DATA field 161 of the flag field 160, received packet discrimination processor 302 determines that this packet constitutes part of data transmitted from packet communication terminal 10, and outputs this packet to data reconstruction part 304. When �1� is stored in FEC field 162, received packet discrimination processor 302 determines that this packet is one generated from redundant data, and outputs this packet to data reconstruction part 304. When �1� is stored with reference to GOOD_ADDRESS field 163, received packet discrimination processor 302 refers to data part 170 and determines whether a network address is stored in its network address field 173. When the result of this determination is that an address is stored in network address field 173, received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to only the stored network address. On the other hand, when no network address is designated in network address field 173, received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to a plurality of destination network addresses stored in destination network address storage 303. When �1� is stored in ADD_ADDRESS field 164, received packet discrimination processor 302 makes destination network address storage 303 store a network address stored in network address field 173 of data part 170, as a destination network address. When �1� is stored in DELETE_ADDRESS field 165, received packet discrimination processor 302 deletes a destination network address equivalent to a network address stored in network address field 173 of data part 170, from destination network address storage 303. [0111] Destination network address storage 303 stores a network address notified of by packet communication terminal 10, as a destination network address. Destination network address storage 303 may memorize a list of destination network addresses on a memory or may memorize a list of destination network addresses while constructing a database on a hard disk, for example. [0112] The data reconstruction part 304, audio-video decoder 305, audio-video encoder 306, data divider 307, and packet generator 308 have the same functions as those of the data reconstruction part 106, audio-video decoder 107, audio-video encoder 108, data divider 109, and packet generator 110 of the packet communication terminal 10, respectively. [0113] In order to transmit packets to a plurality of destination network addresses stored in destination network address storage 303, redundant packet generator 309 generates redundant data by forward error correction codes from divisional data generated through division of data by data divider 307, and adds the MMSP headers to the redundant data to generate packets. At this time, redundant packet generator 309 puts �1� in the FEC field 162 of the MMSP header of each packet, thereby indicating that this packet contains redundant data by forward error correction codes. Here the redundant packet generator 111 generates redundant packets by the number according to the number of destination network addresses. For example, in the case where packet communication terminal 30 transmits packets to two destination network addresses, it generates K redundant packets, corresponding to the number of divisional data, K. The packet communication terminal 30 distributes and transmits the redundant packets generated in this way and the packets generated by packet generator 308, to the two destination network addresses, whereby packet communication terminal 10 becomes able to reconstruct the data by receiving either the K packets or redundant packets out of these packets and redundant packets. In the case where the packet communication terminal 30 receives from packet communication terminal 10 a packet in which �1� is stored in GOOD_ADDRESS field 163 and in which a network address is designated in network address field 173 of data part 170 and where received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to only this network address, as described above, the redundant packet generator 309 generates no redundant packet. [0114] Packet transmitter 310 transmits a packet to a destination network address stored in destination network address storage 303. In the case where packet communication terminal 30 receives from packet communication terminal 10 a packet in which �1� is stored in GOOD_ADDRESS field 163 and in which a network address is designated in network address field 173 of data part 170 and where received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to only this network address, this transmission is carried out so that packet transmitter 310 transmits packets generated by packet generator 308, to only the network address. On the other hand, in the case where the packet communication terminal 30 receives from packet communication terminal 10 a packet in which �1� is stored in GOOD_ADDRESS field 163 and in which no network address is designated in network address field 173 of data part 170 and where the received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to a plurality of destination network addresses stored in destination network address storage 303, packet transmitter 310 distributes and transmits the packets generated by packet generator 308 and the redundant packets generated by redundant packet generator 309, to the plurality of destination network addresses. [0115] The operation of packet communication system 1 according to the present embodiment will be described below, together with the packet communication method according to the present embodiment. First described with reference to the sequence diagrams of FIG. 7 and FIG. 8 is the processing about the notification of network addresses from packet communication terminal 10 to packet communication terminal 30 carried out in conjunction with soft handover to switch between connected base stations because of migration of packet communication terminal 10 from communication area 52 of base station 51 in network 50 to communication area 72 of base station 71 in network 70. [0116]FIG. 7 shows the processing associated with the soft handover in the case where packet communication terminal 10 receives weak radio waves from the both base stations in the boundary overlapping region of the communication areas of base station 51 in network 50 and base station 71 in network 70. As shown in FIG. 7, packet communication terminal 10 is first in a state in which it is present at a location where it can receive the radio wave of high intensity from network 50 and in which it has already notified packet communication terminal 30 of network address A acquired from network 50. Here a period indicated by reference numeral 500 defines a period in which packet communication terminal 10 can receive the strong radio wave from network 50. Let us suppose that packet communication terminal 10 then moves to a location where it can receive the radio waves from both network 50 and network 70. At this time, packet communication terminal 10 acquires network address B from network 70. Then it puts �1� in ADD_ADDRESS field 164 of the MMSP header and puts the network address B in network address field 173 of data part 170 to generate a packet, and thereafter it sends the packet as an ADD_ADDRESS message to packet communication terminal 30 (step S11). Here a period denoted by reference numeral 502 indicates a period in which packet communication terminal 10 receives the weak radio wave from network 70. Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this ADD_ADDRESS message (step S12). This completes the processing about the notification of network address B. [0117] Since packet communication terminal 10 is able to receive the strong radio wave from network 50, it then puts �1� in GOOD_ADDRESS field 163 of the MMSP header and puts network address A acquired from network 50, in network address field 173 of data part 170 to generate a GOOD_ADDRESS message, and transmits it to packet communication terminal 30 (step S13). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this GOOD_ADDRESS message (step S14). After receiving this GOOD_ADDRESS message, packet communication terminal 30 comes to transmit packets to only the network address A. [0118] Then packet communication terminal 10 further moves to a location where it can receive weak radio waves from both networks 50 and 70. Namely, it migrates into a border region between the two networks. Here a period denoted by reference numeral 501 indicates a period in which packet communication terminal 10 receives the weak radio wave from network 50. Since there is no network from that packet communication terminal 10 at this location can receive a strong radio wave, it sends a GOOD_ADDRESS message wherein �1� is stored in GOOD_ADDRESS field 163 of the MMSP header and wherein no network address is designated in network address field 173 of data part 170, to packet communication terminal 30 (step S15). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 having received this GOOD_ADDRESS message (step S16). After these processes at steps S15 and S16, packet communication terminal 30 comes to transmit packets to both network addresses A and B. [0119] Let us suppose that packet communication terminal 10 further moves to a location where it can receive a strong radio wave from network 70. Here a period denoted by reference numeral 503 indicates a period in which packet communication terminal 10 can receive the strong radio wave from network 70. Packet communication terminal 10 having moved to this location transmits a GOOD_ADDRESS message with the network address B designated, to packet communication terminal 30 (step S17). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this GOOD_ADDRESS message (step S18). After these processes at steps S17 and S18, the packet communication terminal 30 comes to transmit packets to only network address B. [0120] Then packet communication terminal 10 is assumed to move to a location where it can receive no radio wave from network 50 and receive the strong radio wave from only network 70. The packet communication terminal 10 having moved to this location sends a DELETE_ADDRESS message wherein �1� is stored in DELETE_ADDRESS field 165 of the MMSP header and wherein network address A is stored in network address field 173 of data part 170, to packet communication terminal 30 (step S19). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this DELETE_ADDRESS message (step S20). These processes at step S19 and step S20 result in deleting the destination network address equivalent to the network address A stored in destination network address storage 303 of packet communication terminal 30. [0121]FIG. 8 shows processing associated with soft handover in the case where the boundary overlapping region of the communication areas of base station 51 in network 50 and base station 71 in network 70 includes a region where packet communication terminal 10 can receive strong radio waves from the both base stations. First, let us suppose that packet communication terminal 10 is located in the communication area of base station 51 in network 50 and can receive the strong radio wave from network 50, as shown in FIG. 8. In this case, packet communication terminal 10 has already notified packet communication terminal 30 of the network address A acquired from network 50. In FIG. 8, a period denoted by reference numeral 505 indicates a period in which packet communication terminal 10 can receive the strong radio wave from network 50. [0122] When packet communication terminal 10 further moves to a location where it can also receive a weak radio wave from base station 71 in network 70, it acquires a network address from network 70. A period denoted by reference numeral 507 is a period in which packet communication terminal 10 can receive the weak radio wave from network 70. Then packet communication terminal 10 transmits an ADD_ADDRESS message containing the acquired network address B, to packet communication terminal 30 (step S21). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this ADD_ADDRESS message (step S22). Through these processes at steps S21 and S22, packet communication terminal 30 comes to transmit packets to the network addresses A and B. [0123] Since packet communication terminal 10 can receive the radio wave of intensity being maximum and not less than the predetermined threshold from base station 51 in network 50, it then transmits a GOOD_ADDRESS message containing the network address A, to packet communication terminal 30 (step S23). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this GOOD_ADDRESS message (step S24). Through these processes at steps S23 and S24, packet communication terminal 30 comes to transmit packets to only the network address A. [0124] Then packet communication terminal 10 moves to a location where it can also receive a strong radio wave from base station 71 in network 70. When the radio wave from base station 71 becomes stronger than that from base station 51 and when the intensity of the radio wave from base station 71 becomes maximum and not less than the predetermined threshold, packet communication terminal 10 transmits a GOOD_ADDRESS message containing the network address B, to packet communication terminal 30 (step S25). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this GOOD_ADDRESS message (step S26). Through these processes at steps S25 and S26, packet communication terminal 30 comes to transmit packets to only the network address B. A period denoted by reference numeral 508 indicates a period in which packet communication terminal 10 can receive the strong radio wave from base station 71 in network 70. [0125] Then packet communication terminal 10 moves to a location where it can receive a weak radio wave from base station 51 in network 50 and further moves to a location where it can receive no radio wave from base station 51. In this case, packet communication terminal 10 transmits a DELETE_ADDRESS message containing the network address A, to packet communication terminal 30 (step S27). Packet communication terminal 10 receives an acknowledgment message from packet communication terminal 30 in response to this DELETE_ADDRESS message (step S28). Through these processes at steps S27 and S28, packet communication terminal 30 deletes the destination network address equivalent to the network address A, which has been stored in destination network address storage 303. A period denoted by reference numeral 506 indicates a period in which packet communication terminal 10 can receive the weak radio wave from base station 51. [0126] Described next is the notification process of the ADD_ADDRESS message for packet communication terminal 10 to notify packet communication terminal 30 of a network address. FIG. 9 is a flowchart of processing about the notification of the network address from packet communication terminal 10 to packet communication terminal 30. In the processing about the notification of the network address, as shown in FIG. 9, packet communication terminal 10 first receives a radio wave from a new base station (step S101). Then packet communication terminal 10 sends a network address request message, for acquiring a network address from a network including this new base station (step S102). Packet communication terminal 10 acquires a network address assigned by the network in response to this network address request message (step S103). Then packet communication terminal 10 determines whether the acquired network address is one previously stored in network address storage 102 (step S104). When the result of this determination is that the above network address is one previously stored in network address storage 102, packet communication terminal 10 terminates this processing. On the other hand, when the above network address is absent in network address storage 102, this network address is stored into network address storage 102 (step S105). Then network address notifying part 103 of packet communication terminal 10 sends an ADD_ADDRESS message containing the above network address, to packet communication terminal 30 (step S106). Network address notifying part 103 then determines whether it can receive an acknowledgment message sent in response to this ADD_ADDRESS message from packet communication terminal 30, within a set time (step S107). When the result of this determination is that it failed to receive the acknowledgment message within the set time, network address notifying part 103 again sends the ADD_ADDRESS message (step S106). On the other hand, when the result of the above determination is that the acknowledgment message was received within the set time, the notification process of the network address is terminated. [0127] Described next is the notification process of the DELETE_ADDRESS message for packet communication terminal 10 to notify packet communication terminal 30 that packet communication terminal 10 becomes no longer able to receive any radio wave from a base station previously connected, thereby requesting packet communication terminal 30 to delete a network address acquired from a network including the base station. FIG. 10 is a flowchart showing the notification process of the DELETE_ADDRESS message. As shown in FIG. 10, packet communication terminal 10 first measures a radio wave from a base station (step S111). Based on this measurement, packet communication terminal 10 determines whether it is within the reach of the radio wave from the base station (step S112). When the result of this determination is that it is within the reach of the radio wave from the base station, packet communication terminal 10 again performs the measurement of the radio wave from the base station (step S111). On the other hand, when it is out of the reach of the radio wave from the base station, a network address acquired from a network including the base station is deleted from network address storage 102 (step S113). Then network address notifying part 103 sends a DELETE_ADDRESS message containing the above network address, to packet communication terminal 30 (step S114). Network address notifying part 103 determines whether it can receive an acknowledgment message sent in response to this DELETE_ADDRESS message from packet communication terminal 30, within a set time (step S115). When the result of this determination is that the acknowledgment message was not received within the set time, network address notifying part 103 again sends the DELETE_ADDRESS message (step S114). On the other hand, when the result of the above determination is that the acknowledgment message was received within the set time, the deletion process of the network address is terminated. [0128] Described next is processing for packet communication terminal 10 to transmit a GOOD_ADDRESS message to packet communication terminal 30. FIG. 11 is a flowchart showing the notification process of the GOOD_ADDRESS message. As shown in FIG. 11, radio wave intensity measuring part 104 of packet communication terminal 10 measures intensities of radio waves from respective base stations in respective networks to which packet communication terminal 10 is connected (step S121). Radio wave intensity measuring part 104 determines whether there is a radio wave with an intensity of not less than the predetermined threshold, among the intensities of the radio waves thus measured (step S122). When the result of this determination is that there are radio waves with intensities of not less than the predetermined threshold, network address notifying part 103 sends a GOOD_ADDRESS message containing a network address acquired from a network including a base station having transmitted the radio wave of the maximum intensity among them, to packet communication terminal 30 (step S123). Network address notifying part 103 determines whether an acknowledgment message to be transmitted in response to this GOOD_ADDRESS message from packet communication terminal 30 can be received within a set time (step S124). When the result of this determination is that the acknowledgment message from packet communication terminal 30 was not received within the set time, network address notifying part 103 again transmits the above GOOD_ADDRESS message (step S123). On the other hand, when the acknowledgment message from packet communication terminal 30 is received within the set time, this processing is terminated. Returning to the determination at step S122, when there is no radio wave with an intensity of not less than the predetermined threshold, network address notifying part 103 sends a GOOD_ADDRESS message with no designated network address to packet communication terminal 30 (step S125). Network address notifying part 103 determines whether an acknowledgment message to be transmitted in response to this GOOD_ADDRESS message from packet communication terminal 30 can be received within a set time (step S126). When the result of this determination is that the acknowledgment message from packet communication terminal 30 was not received within the set time, network address notifying part 103 again sends the above GOOD_ADDRESS message (step S125). On the other hand, when the acknowledgment message from packet communication terminal 30 is received within the set time, this processing is terminated. [0129] Described next is processing for packet communication terminal 30 to store a destination network address in accordance with an ADD_ADDRESS message from packet communication terminal 10. FIG. 12 is a flowchart of the processing executed by packet communication terminal 30 in accordance with the received ADD_ADDRESS message. As shown in FIG. 12, packet receiver 301 of packet communication terminal 30 receives the ADD_ADDRESS message from the packet communication terminal (step S131). Then received packet discrimination processor 302 determines whether the network address in the ADD_ADDRESS message received by packet receiver 301 is one previously stored in destination network address storage 303 (step S132). When the result of this determination is that the above network address is absent in destination network address storage 303, received packet discrimination processor 302 makes destination network address storage 303 store this network address as a destination network address (step S133). On the other hand, when the above network address is one previously stored in destination network address storage 303, no new storage process is carried out, because this network address is already present in destination network address storage 303. For notifying packet communication terminal 10 of completion of the above processing, received packet discrimination processor 302 sends an acknowledgment message to packet communication terminal 10 (step S134). [0130] Described next is processing for packet communication terminal 30 to delete a destination network address in response to a DELETE_ADDRESS message sent from packet communication terminal 10. FIG. 13 is a flowchart of the processing carried out by packet communication terminal 30 in response to the received DELETE_ADDRESS message. As shown in FIG. 13, packet receiver 301 of packet communication terminal 30 receives the DELETE_ADDRESS message sent from packet communication terminal 10 (step S141). Received packet discrimination processor 302 determines whether a network address in this DELETE_ADDRESS message is one stored as a destination network address in destination network address storage 303 (step S142). When the result of this determination is that the above network address is one stored as a destination network address in destination network address storage 303, this destination network address is deleted from destination network address storage 303 (step S143). On the other hand, when the above network address is not stored as a destination network address in destination network address storage 303, the process of deleting the destination network address is not carried out. For notifying packet communication terminal 10 of completion of the above processing, received packet discrimination processor 302 sends an acknowledgment message to packet communication terminal 10 (step S144). [0131] Described next is processing carried out by packet communication terminal 30 in response to a GOOD_ADDRESS message from packet communication terminal 10. FIG. 14 is a flowchart of the processing carried out by packet communication terminal 30 in response to the received GOOD_ADDRESS message. As shown in FIG. 14, packet receiver 301 of packet communication terminal 30 receives the GOOD_ADDRESS message sent from packet communication terminal 10 (step S151). Received packet discrimination processor 302 determines whether a network address in this GOOD_ADDRESS message is one previously stored as a destination network address in destination network address storage 303 (step S152). When the result of this determination is that the above network address is one previously stored as a destination network address in destination network address storage 303, received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to only this destination network address (step S153). On the other hand, when the above network address is not stored as a destination network address in destination network address storage 303, received packet discrimination processor 302 determines whether the address type and address length of the above GOOD_ADDRESS message are �0� (step S154). When the result of this determination is that the address type and address length of the GOOD_ADDRESS message are �0,� i.e., when no network address is designated, received packet discrimination processor 302 controls packet transmitter 310 so as to transmit packets to all the destination network addresses stored in destination network address storage 303 (step S155). On the other hand, when the above GOOD_ADDRESS message contains a network address, the message is judged as an abnormal message and the processing is terminated. For notifying packet communication terminal 10 of completion of the above processing, received packet discrimination processor 302 sends an acknowledgment message to packet communication terminal 10 (step S156). [0132] Described next is processing for packet communication terminal 30 to send packets generated from data to packet communication terminal 10 and for packet communication terminal 10 to reconstruct the data. FIG. 15 is a flowchart of the processing for packet communication terminal 30 to transmit packets generated from data and for packet communication terminal 10 to reconstruct the data. As shown in FIG. 15, data divider 307 divides data encoded by audio-video encoder 306 of packet communication terminal 30, to generate divisional data (step S161). It is then determined whether packet transmitter 310 is controlled to transmit packets to only one destination network address (step S162). When the result of this determination is that packet transmitter 310 is controlled to transmit packets to only one destination network address, packet generator 308 adds the MMSP header to each of the above divisional data to generate packets (step S163). Then packet transmitter 310 adds the IP header to each of the packets generated by packet generator 308, puts the above destination network address in the IP header, and sends the packets to the destination network address (step S164). Returning to the determination at step S162, when packet transmitter 310 is controlled to distribute and transmit packets to a plurality of destination network addresses stored in destination network address storage 303, redundant packet generator 309 first generates redundant data from the above divisional data (step S165). Then packet generator 308 generates packets with the MMSP headers added to the above divisional data and redundant packet generator 309 generates packets with the MMSP headers added to the redundant data (step S166). For distributing and transmitting the above packets to the plurality of destination network addresses stored in the destination network address storage 303, packet transmitter 310 further adds the IP header to each packet, and distributes and stores these destination network addresses into the IP headers of the respective packets. Packet transmitter 310 transmits each packet to the destination network address stored in the IP header of each packet (step S167). Packet receiver 105 of packet communication terminal 10 receives packets transmitted in this way from packet communication terminal 30 (step S168). Data reconstruction part 106 reconstructs the data from the packets received by packet receiver 105 and thereafter audio-video decoder 107 decodes the data (step S169). [0133] Described next is processing for packet communication terminal 10 to transmit packets generated from data to packet communication terminal 30 and for packet communication terminal 30 to reconstruct data. FIG. 16 is a flowchart of the processing for packet communication terminal 10 to transmit packets generated from data and for packet communication terminal 30 to reconstruct the data. As shown in FIG. 16, data divider 109 divides data encoded by audio-video encoder 108 of packet communication terminal 10 to generate divisional data (step S171). It is then determined whether packet transmitter 112 is controlled so as to send packets to only one network (step S172). When the result of this determination is that packet transmitter 112 is controlled to transmit packets to only one network, packet generator 110 adds the MMSP header to each of the above divisional data to generate packets (step S173). For transmitting the packets to the above network, packet transmitter 112 then adds the IP header to each packet generated by packet generator 110, and puts the network address acquired from the above network, as a source network address into each IP header. Packet transmitter 112 transmits the packets thus generated, to the above network (step S174). Returning to the determination at step S172, when packet transmitter 112 is controlled so as to distribute and transmit packets to a plurality of networks, redundant packet generator 111 first generates redundant data from the above divisional data (step S175). Then packet generator 110 generates packets with the MMSP headers added to the above divisional data, and redundant packet generator 111 generates packets with the MMSP headers added to the redundant data (step S176). For distributing and transmitting the above packets to the plurality of networks to which packet communication terminal 10 is connected, packet transmitter 112 then further adds the IP header to each packet, and distributes and stores a plurality of network addresses stored in network address storage 102, into the IP headers of the respective packets. Packet transmitter 112 sends each packet to a network whose network address stored in the IP header thereof was acquired (step S177). Packet receiver 301 of packet communication terminal 30 receives packets sent in this way from packet communication terminal 10 (step S178). When received packet discrimination processor 302 determines that �1� is stored in DATA field 161 of the MMSP header of each packet received by packet receiver 301, the packet is delivered to data reconstruction part 304. Then the data reconstruction part 304 reconstructs the data and thereafter audio-video decoder 305 decodes the data (step S179). [0134] Described next is packet communication program 120 for letting a packet communication terminal function as the aforementioned packet communication terminal 10. FIG. 17 shows the module configuration of packet communication program 120. As shown in FIG. 17, packet communication program 120 comprises main module 121 in charge of processing, network address acquiring module 122, network address storing module 123, network address notifying module 124, radio wave intensity measuring module 125, packet receiving module 126, data reconstruction module 127, audio-video decoding module 128, audio-video encoding module 129, data dividing module 130, packet generating module 131, redundant packet generating module 132, and packet transmitting module 133. Here the functions of letting the packet communication terminal substantialize the operations of network address acquiring module 122, network address storing module 123, network address notifying module 124, radio wave intensity measuring module 125, packet receiving module 126, data reconstruction module 127, audio-video decoding module 128, audio-video encoding module 129, data dividing module 130, packet generating module 131, redundant packet generating module 132, and packet transmitting module 133 are similar to the respective functions of network address acquiring part 101, network address storage 102, network address notifying part 103, radio wave intensity measuring part 104, packet receiver 105, data reconstruction part 106, audio-video decoder 107, audio-video encoder 108, data divider 109, packet generator 110, redundant packet generator 111, and packet transmitter 112. [0135] Described next is packet communication program 320 for letting a packet communication terminal function as the aforementioned packet communication terminal 30. FIG. 18 shows the module configuration of packet communication program 320. As shown in FIG. 18, packet communication program 320 comprises main module 321 in charge of processing, packet receiving module 322, received packet discrimination processing module 323, destination network address storing module 324, data reconstruction module 325, audio-video decoding module 326, audio-video encoding module 327, data dividing module 328, packet generating module 329, redundant packet generating module 330, and packet transmitting module 331. Here the functions of letting the packet communication terminal execute the operations of packet receiving module 322, received packet discrimination processing module 323, destination network address storing module 324, data reconstruction module 325, audio-video decoding module 326, audio-video encoding module 327, data dividing module 328, packet generating module 329, redundant packet generating module 330, and packet transmitting module 331 are similar to the respective functions of packet receiver 301, received packet discrimination processor 302, destination network address storage 303, data reconstruction part 304, audio-video decoder 305, audio-video encoder 306, data divider 307, packet generator 308, redundant packet generator 309, and packet transmitter 310. [0136] Packet communication program 120 and packet communication program 320 are provided, for example, by recording media such as CD-ROM, DVD, ROM, etc., or by semiconductor memories. Packet communication program 120 and packet communication program 320 may be those provided as computer data signals over a carrier wave through a network. [0137] The action and effect of packet communication system 1 according to the present embodiment will be described below. In packet communication system 1 of the present embodiment, when packet communication terminal 10 is present at the location where communication areas of two or more networks overlap each other, and is connectible to each of the networks, network address acquiring part 101 acquires network addresses from the respective networks. Network address storage 102 stores these network addresses and network address notifying part 103 notifies packet communication terminal 30 of these network addresses. In packet communication terminal 30, destination network address storage 303 stores the network addresses thus notified of, as respective destination network addresses. Then packet transmitter 310 of packet communication terminal 30 distributes and transmits packets generated by packet generator 308 and packets generated by redundant packet generator 309, to the destination network addresses stored in destination network address storage 303. Packet receiver 105 of packet communication terminal 10 receives packets transmitted to the respective destination network addresses in this way. When the system is constructed in this configuration wherein when packet communication terminal 10 is located at the position where communication areas of networks overlap each other, and is connectible to a plurality of networks, packet communication terminal 30 transmits packets to the network addresses acquired from the respective networks, even if packet communication terminal 10 further moves into a state where packet communication terminal 10 is no longer able to stay connected to any one of the networks, it can receive packets transmitted through the other networks from packet communication terminal 30, without delay. The packets transmitted from packet communication terminal 30 to packet communication terminal 10 encompass packets consisting of divisional data generated from data to be transmitted, and packets consisting of redundant data generated by forward error correction codes from the divisional data. Packet transmitter 310 distributes and transmits these packets to the destination network addresses notified of by packet communication terminal 10. This distribution is implemented in such a manner that even if any one of the destination network addresses becomes ineffective, packet communication terminal 10 can receive different packets in the number equal to or greater than the number of packets generated by packet generator 308. Therefore, packet communication terminal 10 can receive packets in the number permitting recovery of the above data. As a result, packet communication terminal 10 can receive the packets transmitted from packet communication terminal 30, without delay. [0138] In packet communication terminal 10, network address notifying part 103 sends a DELETE_ADDRESS message containing a network address acquired from a network to which packet communication terminal 10 is no longer able to stay connected, to packet communication terminal 30. Received packet discrimination processor 302 of packet communication terminal 30 disables a destination network address corresponding to the network address included in the above DELETE_ADDRESS message. Namely, it deletes the above destination network address stored in destination network address storage 303. Therefore, it is feasible to cut down the waste that packet communication terminal 30 transmits packets to a network to which packet communication terminal 10 is unable to stay connected. [0139] When packet communication terminal 10 is connected to multiple networks, radio wave intensity measuring part 104 measures intensities of radio waves from the respective networks. When the maximum intensity out of the intensities measured is not less than the predetermined threshold, network address notifying part 103 then sends a GOOD_ADDRESS message containing a network address acquired from the network having transmitted the radio wave of the maximum intensity, to packet communication terminal 30. In packet communication terminal 30, packet transmitter 310 then transmits packets to a destination network address corresponding to the network address included in this GOOD_ADDRESS message. Namely, in the network transmitting the radio wave of the intensity being not less than the predetermined threshold and being maximum among the plurality of networks, it can be assumed that packet communication terminal 10 is located near a base station belonging to the network and is in a good communication state therewith, and, under a judgment that packet communication terminal 10 is able to stay connected to the network while maintaining this communication state for the time being, packet communication terminal 30 determines the above network address notified of, as a destination network address and sends packets to this destination network address. Therefore, packet communication terminal 10 can receive packets transmitted from packet communication terminal 30, without delay and it is feasible to cut down the waste of transmitting packets through all the networks to which packet communication terminal 10 can be connected. [0140] In packet communication terminal 10, when intensities of radio waves from multiple networks measured by radio wave intensity measuring part 104 are smaller than the predetermined threshold, network address notifying part 103 sends a GOOD_ADDRESS message containing no designated network address, to packet communication terminal 30. Packet communication terminal 30 acknowledges that no network address is designated in the GOOD_ADDRESS message, and then transmits packets to each of the plurality of destination network addresses stored in destination network address storage 303. Namely, when the intensities of the radio waves from the respective networks measured by radio wave intensity measuring part 104 are smaller than the predetermined threshold, the packet communication terminal 10 is determined to be located in a border region among the communication areas of the respective networks, and packet communication terminal 30 transmits packets to the network addresses acquired from the respective networks by packet communication terminal 10, as destination network addresses. In this configuration, even if packet communication terminal 10 moves from the boundary region of the networks into a state where it is no longer able to stay connected to any one of the networks, packet communication terminal 10 can receive packets through the other networks from packet communication terminal 30, without delay. [0141] When packet communication terminal 10 is connectible to a plurality of networks, network address notifying part 103 transmits network addresses acquired from the respective networks, to packet communication terminal 30. Destination network address storage 303 of packet communication terminal 30 stores the network addresses transmitted from packet communication terminal 10, as respective destination network addresses. Thereafter, packet transmitter 112 of packet communication terminal 10 distributes and transmits packets generated by packet generator 110 and packets generated by redundant packet generator 111, to the networks to which packet communication terminal 10 can be connected. Packet receiver 301 of packet communication terminal 30 receives packets transmitted through the respective networks from packet communication terminal 10. For example, in the case where packet communication terminal 10 is present at a location where communication areas of multiple networks overlap each other, and is connectible to the multiple networks, packet communication terminal 10 distributes and transmits packets to the connectible networks as described above; whereby, even if packet communication terminal 10 further moves into a state where it is no longer able to stay connected to any one of the networks, the packets transmitted from packet communication terminal 10 can be received through the other networks by packet communication terminal 30, without delay. The packets transmitted from packet communication terminal 10 to packet communication terminal 30 encompass packets consisting of divisional data generated from data to be transmitted, and packets consisting of redundant data generated by forward error correction codes from the divisional data. Packet transmitter 112 distributes and transmits these packets to the plurality of networks to which packet communication terminal 10 can be connected. This distribution is implemented in such a manner that even if packet communication terminal 10 becomes no longer able to stay connected to any one of the networks, packet communication terminal 30 can receive different packets in the number equal to or greater than the number of packets generated by packet generator 110. Therefore, packet communication terminal 30 can receive packets in the number permitting recovery of the above data. As a result, packet communication terminal 30 can receive packets transmitted from packet communication terminal 10, without delay. [0142] The present invention can be modified in various ways without having to be limited to the above-stated embodiments. For example, in the embodiments, when packets were transmitted through multiple networks, the packets were transmitted while distributing the packets with the headers added to the divisional data obtained by dividing data to be transmitted, and the packets with the headers added to the redundant data generated from the divisional data, to the networks. Instead thereof, the packets with the headers added to the divisional data obtained by dividing data to be transmitted may be transmitted through all the networks to which the packet communication terminal can be connected. In this case, even if the packet communication terminal becomes no longer able to stay connected to any one of multiple networks to which the packet communication terminal is connected, the correspondent packet communication terminal can receive the packets transmitted through the other networks, without delay. 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