JP2000349829A - Packet control method and radio packet communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a useless traffic and a communication waste time from occurring even when the hand-over of a mobile terminal is caused in a communication system where a radio communication system is connected to a packet network via an interworking device. SOLUTION: Upon the occurrence of head-over, a mobile packet terminal (MS) 11 transmits a control packet of an address registration request to a home agent(HA) 6 via an interworking unit (IWF) 52. When a control packet is in existing in a data packet buffer and even when a packet buffer stores a data packet relating to a terminal MS 12 being a control object at present, the IWF 52 extracts the packet in the control packet buffer with priority. Then the control packet quickly passes through the IWF 52 and reaches the HA 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a packet control method and a wireless packet communication system when a wireless communication system and a packet network are connected via an interworking device.

[0002]

2. Description of the Related Art FIG. 14 is a system configuration diagram showing a configuration of a packet communication system in which a moving packet terminal can communicate with another packet terminal via a base station and an interworking device. In the state shown in FIG. 1, a moving packet terminal (MS: Mobile St)
) 11 is a base station wireless device (BTS: Bass).
e Transceiver Station (21) and a base station controller (BSC: Base Station)
A mobile communication switching center (MSC) via a controller 31
inter.4). MS 12 is connected to MSC 4 via BTS 22 and BSC 32. In addition,
The MSs 11 and 12 are, for example, mobile terminals conforming to the IS-95 specification, and communicate with the BTSs 21 and 22 in a CDMA system.

The MS 11 can communicate with the packet terminals 71 and 72 via an interworking device (IWF) 51 connected to the BSC 31 and also serving as an external agent function and a home agent (HA) 6 in the packet network 8. Yes, MS12 is
IWF 52 and packet network 8 connected to BSC 32
Terminal 7 via home agent 6 at
1,72 can be communicated. The HA 6 is realized by a router device or a computer device.

[0004] Next, referring to a flowchart of FIG. 15, an explanatory diagram of FIG. 16 and a sequence diagram of FIG.
The packet communication between the communication terminal and the packet terminal 71 will be described.

[0005] It is assumed that the MS 11 is communicating with the packet terminal 71. In addition, the communication during that time is based on IP (Inte
(Rnet Protocol) packet is assumed. Then, it is assumed that the MS 11 moves from the packet network 8 and enters the zone of the BTS 21.
Then, since the packet terminal 71 does not know that,
A packet addressed to the MS 11 is transmitted to the packet network 8. HA
6 receives the packet addressed to the MS 11 from the packet terminal 71 as a proxy, because it knows that the MS 11 has moved. Then, the received packet is transferred to the IWF 51 according to the registered transfer information. IWF
51 transfers the received packet to the MS 11.

Accordingly, the packet terminal 71 can actually transmit a packet to the MS 11 existing at the destination. Further, the packet from the MS 11 is routed by the destination address to the packet terminal 71 (I
ETF (Internet Engineering T
Ask Force) (see RFC2002).

Here, it is assumed that the MS 11 has moved (handed over) under the zone of the BSC 32, that is, under the control of the IWF 52. Then, the radio channel between the MS 11 -BTS 21 -BSC 31 is released, and the MS 11 transmits the H via the IWF 52 to register the transfer information in the HA 6.
A control packet (address registration request) is sent to A6.
The HA 6 allows the MS 11 to transmit the IW
It is possible to know that handover has been performed under the control of F52. Therefore, hereinafter, the packet addressed to the MS 11 is transferred to the IWF 52
Can be sent out.

However, when a control packet is sent via the IWF 52 and the IWF 52 controls another MS 12, the buffer of the IWF 52 is filled with data packets transmitted to and received from the MS 12. As shown in FIG. 15, when a packet arrives at the packet network 8 from the mobile terminal (step S61), the IWF 52 temporarily stores the received packet in a buffer, and then stores the packet in the storage order, that is, the reception order. (Step S62). When a packet arrives from the packet network 8 (step S71), the IWF 52 temporarily stores the received packet in a buffer, and sends the packet to the mobile terminal side in the storage order, that is, the reception order (step S71).
72).

As shown in FIG. 16, data packets and control packets are stored in a buffer in the order of arrival, and are read out from the buffer and transmitted in the order of storage. In FIG. 16, the Mob stored first in the buffer
ileIP-RR (MobileIP-Registr)
The request packet is a control packet for the address registration request, but the control packet for the address registration request is not transmitted to the HA 6 unless the data packets 0 to 2 are transmitted. Also, the second Mobile
leIP-RR (MobileIP-Registra
The control packet of the address registration response is not transmitted to the MS 11 unless data packets 3 and 4 are transmitted.

Then, as shown in FIG. 17, even if a handover occurs and the MS 11 sends out a control packet for an address registration request, the transfer information is not immediately registered in the HA 6 but is registered with a delay. . The control packet of the address registration response arrives at the MS 11 with a further delay.

The control packet of the address registration request is HA6
Until the packet arrives at, the data packet addressed to the MS 11 from the packet terminal 71 is continuously sent to the IWF 51. However, since the MS 11 has already performed the handover, the wireless channel between the MS 11 and the BTS 21 and the BSC 31 is released. Therefore, the data packet is not sent first from the IWF 51, and the data packet is discarded. Since the data packet addressed to the MS 11 from the packet terminal 71 is continuously discarded until the transfer information of the HA 6 is updated, useless traffic occurs in the network. During this time, communication between the MS 11 and the packet terminal 71 loses time.

[0012]

As described above, in a system in which a radio communication system accommodating a moving packet terminal and a packet network accommodating the packet terminal are connected by an interworking device, when a mobile terminal performs a handover, a home network is established. Arrival of transfer information to the agent may be delayed. As a result, there is a problem that address resolution for an IP packet is delayed, data packets are frequently discarded, and a dead time occurs in communication.

It is an object of the present invention to provide a packet control method and a wireless packet communication system that do not cause useless traffic and communication waste time even when a handover of a mobile terminal occurs.

[0014]

A packet control method according to the present invention is a packet control method applied to a communication system in which a wireless communication system and a packet network are connected via an interworking device. Sends a control packet issued when a moving packet terminal is handed over to the packet network side prior to other packets, and sends a control packet from the packet network side to the wireless communication system side prior to other packets. It is characterized by doing.

A wireless packet communication system according to the present invention is a wireless packet communication system applied to a communication system in which a wireless communication system and a packet network are connected via an interworking device. When a control packet from the wireless communication system is detected, the packet control means on the wireless side sends the packet to the packet network in preference to other packets, and when a control packet from the packet network is detected, Network-side packet control means for transmitting the packet to the wireless communication system prior to other packets.

The radio side packet control means sends a control packet issued when a moving packet terminal performs handover to the packet network side in preference to other packets. It is preferable to send a control packet in response to a control packet issued when handover is performed to the wireless communication system in preference to other packets.

The interworking device includes a wireless control packet buffer for storing a control packet to be transmitted to the packet network with priority, and a wireless data packet buffer for storing other packets. The configuration may be such that a packet stored in the wireless-side control packet buffer is extracted and transmitted earlier than a packet stored in the wireless-side data packet buffer. According to such a configuration, write / read management of the buffer is simplified.

The interworking apparatus further includes a network-side control packet buffer for storing a control packet to be transmitted to the wireless communication system with priority, and a network-side data packet buffer for storing other packets. The means may be configured to extract and transmit a packet stored in the network-side control packet buffer before a packet stored in the network-side data packet buffer.

The interworking apparatus includes a wireless packet buffer for storing packets from the wireless communication system, and a retrieval queue in which the order of sending packets in the wireless packet buffer is set. Alternatively, the control packet to be transmitted preferentially may be set at the head of the extraction queue more than other packets. In this case, only one buffer is required, and the buffer structure is simplified.

The interworking apparatus further includes a network-side packet buffer for storing packets from the packet network side, and a retrieval queue in which the order of sending packets in the network-side packet buffer is set. May be configured such that the control packet to be transmitted with priority is set at the head of the extraction queue more than other packets.

In the wireless packet communication system, the interworking apparatus is provided with a wireless interface based on, for example, the IS-95 / CDMA system, and the packet terminal performs communication using IP packets. In addition, IS
−95 / CDMA (Code Division Mul)
The “tip Access” method is based on EIA / TIA (Electronic Ind.), a US standardization organization.
industries Association: American Electronics Industry Association / Telecommunications In
Dustry Association: American Telecommunications Industry Association, ANSI (American Nation)
al Standard Institute: American Standards Association, CDG (CDMA Development)
Group: American CDMA Development Association).

[0022]

Embodiments of the present invention will be described below with reference to the drawings. Again, taking the system shown in FIG. 14 as an example, FIG. 1 shows the IWFs 51 and 5 in the present invention.
FIG. 2 is a block diagram showing one configuration example. IWF51,5
Reference numeral 2 denotes a wireless channel interface 501 for connecting to the wireless communication system side, a packet network interface 502 for connecting to the packet network 8 side, and a wireless side packet detection for determining the type of a packet sent from the wireless communication system side. A wireless-side control packet buffer 5 for temporarily storing a control packet from the wireless communication system side
03, includes a wireless data packet buffer 504 for temporarily storing data packets from the wireless communication system, and a wireless packet controller 506 for controlling packet transmission in the buffer. Note that the wireless side packet detection unit 505
The wireless-side packet control unit 506 is an example of a wireless-side packet control unit.

The IWFs 51 and 52 further include a network-side packet detector 509 for determining the type of the packet sent from the packet network 8, and a network-side control packet buffer 507 for temporarily storing control packets from the packet network 8. , A network-side data packet buffer 508 for temporarily storing data packets from the packet network 8, and a network-side packet control unit 510 for controlling transmission of packets in the buffer. Note that the network-side packet detection unit 509 and the network-side packet control unit 510 are examples of realizing a network-side packet control unit.

FIGS. 2 and 3 are explanatory diagrams showing an example of the configuration of a control packet handled by a mobile terminal. The configuration shown in FIGS. 2 and 3 is, for example, a document “CDMA M” issued by a CDG.
obileIP Implementation Gu
idlines (Ver1.5) ". FIG. 2 shows an address registration request (Mobile IP-Regist Request) transmitted from a mobile terminal.
FIG. 3 shows an address registration response (MobileIP-Regist Reply: Mo) transmitted to the mobile terminal side.
FIG. 4 shows a control packet of the file (IP).

In FIGS. 2 and 3, Ver
4, Len (5) and TOS indicate the IP version number, header length and service type. TTL and protocol (17) indicate the lifetime of the datagram and the upper layer protocol (UDP). The incoming port number (434) and the outgoing port number (434) indicate a UDP port number 434 to be used as an address registration request and an address registration response defined in the above-mentioned document "RFC2002". Mobile IP registration (1) and mobile IP response (3) indicate the protocol type in the configuration of the mobile IP registration message, (1) indicates a registration request, and (3) indicates a registration response. SPI and Out
h is data for authentication to the HA and data for security at the time of registration to the HA.

Next, the operation will be described with reference to the flowcharts of FIGS. 4 and 5 and the explanatory diagrams of FIGS. Again, MS 11 and packet terminal 71 are IWF
A case is described in which packet communication is performed via the IWF 52 and packet communication is performed via the IWF 52. Then, it is assumed that the MS 11 has handed over under the control of the BSC 32. Therefore, MS11
A control packet of the address registration request is sent to the IWF 52 that manages the BSC 32, and the HA 6 is notified that the own terminal has moved to the control of the BSC 32.

In the IWF 52, when the wireless channel interface 501 receives a data link layer frame, the wireless packet detector 505 extracts an IP packet. Then, as shown in FIG. 4, it is determined whether the outgoing port number or the incoming port number of the UDP header is "434" (step S21). If the outgoing port number or the incoming port number is "434", the packet is stored in the wireless control packet buffer 503 as a control packet (step S22). Otherwise, the packet is stored in the wireless data packet buffer 504 as a data packet (step S23).

When the packet extraction timing comes, the wireless side packet control unit 506 first refers to the wireless side control packet buffer 503. If the wireless side control packet buffer 503 is not empty, the packet is taken out therefrom and output to the packet network interface 502 (steps S24, S25). Packet network interface 5
02 sends the input packet to the packet network 8.
If the wireless control packet buffer 503 is empty, the packet is taken out from the wireless data packet buffer 504 and output to the packet network interface 502 (steps S26 and S27).

As described above, the radio side packet control unit 50
6 preferentially sends out the data stored in the wireless side control packet buffer 503, so that the control packet of the address registration request from the MS 11 is affected by the data packet between the MS 12 and the packet terminal 72. And is sent to the packet network 8 immediately. Packet network 8
Transmitted to the HA 6 arrives. HA
6 immediately returns the control packet of the address registration response to the MS 11 after registering the contents.

The control packet of the address registration response is IWF
When the packet reaches the packet network interface 502 of 52, the network-side packet detection unit 509 extracts the IP packet. Then, as shown in FIG. 5, it is determined whether the outgoing port number or the incoming port number of the UDP header is "434" (step S31). If the outgoing port number or the incoming port number is "434", the packet is stored in the network-side control packet buffer 507 as a control packet (step S32). Otherwise, the packet is stored in the network-side data packet buffer 508 as a data packet (step S33).

The network side packet control unit 510 includes:
When the packet extraction timing comes, first, the network-side control packet buffer 507 is referred to. If the network side control packet buffer 507 is not empty, the packet is taken out therefrom and output to the wireless channel interface 501 (steps S34, S35).
The wireless channel interface 501 sends the input packet to the BSC 32. If the network side control packet buffer 507 is empty, a packet is taken out from the network side data packet buffer 508 and output to the wireless channel interface 501 (step S).
36, S37).

As described above, the network-side packet control unit 510 controls the network-side control packet buffer 5
Since the data stored in 07 is transmitted with priority.
The control packet of the address registration response from HA6 is MS
The packet is immediately transmitted to the MS 11 without being affected by the data packet between the packet terminal 12 and the packet terminal 72.

FIG. 6 shows (A) a packet stored in the data packet buffer (wireless data packet buffer 504 or network side data packet buffer 508), and (B) a control packet buffer (wireless control packet buffer 503 and FIG. 9 is an explanatory diagram showing an example of a packet stored in a network-side control packet buffer (507). However, in FIG. 6, for simplicity of explanation, the wireless side control packet buffer 503 is shown.
And the network-side control packet buffer 507 are shown as one buffer.

The wireless side packet control unit 506 of the IWF 52
When the packet exists in the control packet buffer, the network-side packet control unit 510 determines whether the packet in the control packet buffer is present even if the data packet related to the MS 12 currently being controlled is stored in the data packet buffer. Take out with priority. FIG.
Indicates that the data packet n (MS2) is a data packet from the MS 21 or a data packet to the MS 21.

FIG. 7 shows that the MS 11 and the packet terminal 71
When performing packet communication via WF51, MS
FIG. 11 is a sequence diagram showing an example of data communication when 11 performs handover under the control of the BSC 32. FIG. 8 shows a communication mode before a handover occurs, and FIG. 9 shows a communication mode when a handover occurs.

As shown in FIG.
, A registration request is made to the HA 6 to that effect. Thereafter, the MS 11 communicates with the packet terminal 71 via the IWF 51 and the HA 6. As shown in FIG. 9, when a handover occurs, the MS 11 sends an address registration request control packet to the HA via the IWF 52.
6, the control packet is immediately passed through the IWF 52 and sent to the HWF as described above.
Reach A6. That is, the transfer information is immediately registered in the HA 6. Therefore, the control packet of the address registration response from the HA 6 also reaches the MS 11 promptly.

The registration time shown in FIG. 7 is much shorter than the registration time in the conventional system shown in FIG. Therefore, the possibility that the packet addressed to the MS 11 from the packet terminal 71 is discarded is much smaller. Further, since the control packet of the address registration response from the HA 6 arrives at the MS 11 promptly, no time loss occurs in the communication between the MS 11 and the packet terminal 71.

FIG. 10 shows IWFs 51 and 5 according to the present invention.
FIG. 9 is a block diagram showing another example of the configuration of FIG. In this embodiment, the IWFs 51 and 52 include a wireless channel interface 501 for connecting to the wireless communication system side, a packet network interface 502 for connecting to the packet network 8 side, and a packet for sending from the wireless communication system side. It includes a wireless packet detector 505 for determining the type, a wireless packet buffer 520 for temporarily storing all packets from the wireless communication system, and a wireless packet controller 506 for controlling packet transmission in the buffer.

The IWFs 51 and 52 further include a network side packet detector 509 for determining the type of the packet sent from the packet network 8 side, and a network side packet buffer 530 for temporarily storing all the packets from the packet network 8 side. , And a network-side packet control unit 510 for controlling packet transmission in the buffer.

Next, the operation of another embodiment will be described with reference to the flowcharts of FIGS. 11 and 12 and the explanatory diagram of FIG. Again, MS 11 and packet terminal 7
1 performs packet communication via the IWF 51, and
And a case where the packet terminal 72 performs packet communication via the IWF 52. And MS11 is BS
The handover is performed under the control of the C32, and the MS 11 transmits the control packet of the address registration request to the IW that manages the BSC 32.
It is assumed that the terminal has transmitted to F52 and notified the HA 6 that the terminal has moved to the control of the BSC 32.

In the IWF 52, when the wireless channel interface 501 receives a data link layer frame, the wireless packet detector 505 extracts an IP packet. In this case, the wireless side packet detection unit 505
Stores all IP packets in the wireless-side packet buffer 520 as shown in FIG. 11 (step S4).
1). Then, it is determined whether the outgoing port number or the incoming port number of the UDP header is "434" (step S42).

If the originating port number or the destination port number is "43"
If "4", the packet is connected to the head of the extraction queue provided inside the wireless side packet control unit 506. If there is a control packet already connected to the extraction queue, the last control packet is searched for and connected immediately after that (step S43). Specifically, the content of the column of the next address (address in the wireless side packet buffer 520) in the queue element corresponding to the last control packet is changed to the address for storing the packet to be connected, and The content of the column of the previous address in the queue element to be changed is changed to the address for storing the last control packet. Further, the contents of the column of the next address in the queue element corresponding to the packet to be connected are the contents described in the column of the next address of the queue element corresponding to the last control packet.

Each of the queue elements constituting the extraction queue includes an extraction address (buffer address where the packet is stored), a previous address (a memory address where the packet corresponding to the immediately preceding queue element is stored), And the next address (the buffer address where the packet corresponding to the next queue element is stored).

Then, the wireless side packet control unit 506
When the packet extraction timing comes, the packet at the head of the extraction queue is extracted and output to the packet network interface 502 (steps S44 and S45).

FIG. 13 is an explanatory diagram showing an example of data stored in the extraction queue and the buffer (in this case, the wireless packet buffer 520). FIG.
If the packet is stored in the buffer (wireless side packet buffer 520) as shown in FIG.
As shown in (A), the head queue element of the extraction queue has MobileIP-R as an extraction address.
"4" in which the control packet of eq is stored is described, and "7" in which the next control packet is stored is described as the next address. Here, data transfer from the wireless communication channel (Tch) side to the packet network 8 side will be described. However, FIG. 13 also illustrates data transfer from the packet network 8 side to the Tch side as described later. Used.

The second queue element of the retrieval queue has a MobileIP-R as a retrieval address.
"7" in which the control packet of ep is stored is described, "1" in which the first arriving data packet is stored is described as the next address, and the packet corresponding to the first queue element is stored as the previous address. Address "4" is described.

It is assumed that buffer addresses "1" to "6"
In the state where the packet is stored in MobileIP-
Assuming that the control packet of Rep has arrived, the packet is stored at address “7”. And step S
By the process of 43, it is confirmed that the control packet exists in the buffer. In this situation, the control packet is the MobileIP corresponding to the head queue element of the queue.
Since there is only a control packet of -Req, "7" is set to the next address of the head queue element.

The queue element whose take-out address is "7" is sorted second in the take-out queue. Then, in the queue element, the previous address is set to “4” and the next address is set to “1”.
Immediately before a new control packet of MobileIP-Rep arrives, “1” should have been set to the next address of the head queue element.

The extraction queue is provided with a start address at which a packet corresponding to the head queue element is stored and a final address at which a packet corresponding to the tail queue element is stored. “7” is set in the address. As shown in FIG.
In the state where the packets of addresses “1” to “9” are stored, the address at which the packet corresponding to the last queue element is stored is “9”, so “9” is set as the last address. .

FIG. 13 shows a state in which a control packet of MobileIP-Req and a control packet of MobileIP-Rep are stored in the buffer as control packets for the sake of simplicity. Indicates that the control packet of MobileIP-Req is stored in the wireless-side packet buffer 520,
The control packet of -Rep is stored in the network-side packet buffer 530. In FIG. 13, a data packet n (MS2) indicates a data packet transmitted from the MS12.

Also in this embodiment, since the radio side packet control unit 506 sends out the control with priority, the control packet of the address registration request from the MS 11 affects the data packet between the MS 12 and the packet terminal 72. Without being transmitted to the packet network 8 immediately. The control packet sent to the packet network 8 reaches the HA 6.
After registering the contents, the HA 6 immediately returns an address registration response control packet to the MS 11.

The control packet of the address registration response is IWF
When the packet reaches the packet network interface 502 of 52, the network-side packet detection unit 509 extracts the IP packet. In this case, the network-side packet detection unit 509 stores all IP packets in the network-side packet buffer 530 as shown in FIG. 12 (Step S51). Then, it is determined whether the outgoing port number or the incoming port number of the UDP header is "434" (step S52).

If the originating port number or the destination port number is "43"
If "4", the packet is connected to the head of the extraction queue provided inside the network side packet control unit 510. If there is a control packet already connected to the extraction queue, the last control packet is searched for and connected immediately after that (step S53).

Then, the network side packet control unit 5
When the packet extraction timing arrives, the packet extraction unit 10 extracts the head packet of the extraction queue and outputs it to the wireless channel interface 501 (step S45,
S55). The configuration of the retrieval queue is shown in FIG.
It may be the same as that illustrated in FIG. However, in this case, the data packet n (MS2) in FIG. 13 means a data packet transmitted from the packet network 8 to the MS12.

As described above, the network-side packet control unit 510 also transmits the control packet in preference to the data packet, so that the control packet of the address registration response from the HA 6 is a data packet between the MS 12 and the packet terminal 72. The packet is immediately transmitted to the MS 11 without being affected by the packet.

In this embodiment, a single buffer may be used to temporarily store packets from the wireless communication system to the packet network 8, and packets to be temporarily stored from the packet network 8 to the wireless communication system. One buffer may be used.

[0057]

According to the present invention, a packet control method and a wireless packet communication system are provided to a packet network side by an interworking apparatus by giving priority to a control packet issued when a moving packet terminal is handed over another packet. Since transmission and control packets from the packet network side are sent to the wireless communication system side prior to other packets, even if handover of the mobile terminal occurs, unnecessary traffic and communication dead time may occur. There is an effect that there is no.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an IWF according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration example of a control packet transmitted by a mobile terminal.

FIG. 3 is an explanatory diagram showing a configuration example of a control packet transmitted to a mobile terminal.

FIG. 4 is a flowchart showing control for sending a packet to a packet network.

FIG. 5 is a flowchart showing control of packet transmission to a wireless channel.

FIG. 6 is an explanatory diagram showing an example of a packet stored in a buffer.

FIG. 7 is a sequence diagram illustrating a data communication example when the MS 11 performs a handover under the control of the BSC 32.

FIG. 8 is an explanatory diagram showing a communication mode before a handover occurs.

FIG. 9 is an explanatory diagram showing a communication mode when a handover occurs.

FIG. 10 is a block diagram showing another embodiment of the IWF.

FIG. 11 is a flowchart showing control of packet transmission to a packet network.

FIG. 12 is a flowchart showing packet transmission control to a wireless channel.

FIG. 13 is an explanatory diagram showing an example of data stored in a retrieval queue and a buffer.

FIG. 14 is a system configuration diagram showing a configuration of a packet communication system in which a moving packet terminal can communicate with another packet terminal via a base station and an interworking device.

FIG. 15 is a flowchart showing a conventional packet transmission control to a packet network.

FIG. 16 is a flowchart showing a conventional packet transmission control to a wireless channel.

FIG. 17 is a sequence diagram showing a conventional data communication example when the MS 11 performs a handover under the control of the BSC 32.

[Explanation of symbols]

 Reference Signs List 4 mobile switching center (MSC) 6 home agent (HA) 8 packet network 11, 12 packet terminal (MS) 21, 22 base station radio equipment (BTS) 31, 32 base station controller (BSC) 51, 52 inter Working device (IWF) 71, 72 Packet terminal 501 Radio channel interface 502 Packet network interface 503 Radio side control packet buffer 504 Radio side data packet buffer 505 Radio side packet detection unit 506 Radio side packet control unit 507 Network side control packet buffer 508 Network Side data packet buffer 509 network side packet detector 510 network side packet controller 520 wireless side packet buffer 530 network side packet buffer

Continued on the front page F term (reference) 5K030 HA08 HB16 HD01 JL01 JT09 KA03 LA03 LA18 LE05 5K067 AA11 CC08 EE02 GG06 JJ33 JJ39 5K072 AA12 BB02 BB13 CC15 CC20 FF02 FF27 9A001 BB03 CC05 CC06 CC07

Claims (8)

[Claims] 1. A packet control method applied to a communication system in which a wireless communication system and a packet network are connected via an interworking device, wherein the interworking device is issued when a moving packet terminal performs handover. A packet control method, wherein a control packet is transmitted to a packet network side prior to another packet, and a control packet from the packet network side is transmitted to a wireless communication system side prior to another packet. 2. A wireless packet communication system applied to a communication system in which a wireless communication system and a packet network are connected via an interworking device, wherein the interworking device transmits a control packet from the wireless communication system. The wireless side packet control means for sending the packet to the packet network side prior to other packets when detected, and prioritizing the packet over other packets when detecting a control packet from the packet network side. And a network-side packet control means for transmitting the packet to the wireless communication system. 3. The wireless side packet control means sends a control packet issued when a moving packet terminal is handed over to a packet network side prior to another packet, and the network side packet control means controls the control packet with respect to the control packet. 3. The wireless packet communication system according to claim 2, wherein a response control packet is sent to the wireless communication system side prior to other packets. 4. An interworking apparatus comprising: a radio side control packet buffer for storing a control packet to be preferentially transmitted to a packet network side; and a radio side data packet buffer for storing other packets. 4. The wireless packet communication system according to claim 2, wherein the packet is extracted and transmitted before the packet stored in the wireless side data packet buffer is stored in the wireless side data packet buffer. 5. An interworking apparatus comprising: a network-side control packet buffer for storing a control packet to be transmitted to the wireless communication system with priority; and a network-side data packet buffer for storing other packets. 5. The wireless packet communication system according to claim 4, wherein the means extracts and stores the packet stored in the network-side control packet buffer before the packet stored in the network-side data packet buffer. 6. An interworking apparatus comprising: a wireless packet buffer for storing packets from the wireless communication system; and an extraction queue in which the order of sending packets in the wireless packet buffer is set. 4. The wireless packet communication system according to claim 2, wherein the means sets the control packet to be transmitted preferentially at the head of the retrieval queue more than other packets. 7. An interworking apparatus comprising: a network-side packet buffer for storing packets from a packet network side; and a retrieval queue in which an order of sending packets in the network-side packet buffer is set. 7. The wireless packet communication system according to claim 6, wherein the control packet is set so that the control packet transmitted preferentially is taken out of the other packets and placed at the head of the queue. 8. The interworking device is an IS-95.
And a wireless terminal using a / CDMA system, wherein the packet terminal performs communication using an IP packet.
The wireless packet communication method according to 3, 4, 5, 6, or 7.