JP2980069B2 - Wireless packet transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio packet transmission system having radio logical link control for performing error control by multiplexing transmission / reception data and automatic retransmission between a mobile station and a base station controller in mobile data communication. Things.

[0002]

2. Description of the Related Art To perform error control in a wireless section, there is packet data communication that incorporates automatic retransmission control (wireless logical link control). In connection therewith, “B-303 packet communication data in the PDC system” presented at the IEICE Society Conference (B-5. Wireless Communication System A) held from September 5 to 8, 1995. Link control procedure "(Masaki Shirota, NTT Mobile Communication Network Co., Ltd.) (hereinafter referred to as the present data link control procedure).

[0003] The above data link control procedure will be described. This data link control procedure is a procedure for reducing signals in a wireless section for the purpose of efficient operation, and FIG. 14 is a diagram showing a configuration in the data link control procedure. In the figure, 10a to 10b are mobile terminals, 1
1a to 11b are radio base stations. Reference numeral 12 denotes a mobile communication control station (MSC) that performs call connection control for outgoing / incoming calls of mobile terminals, handover line switching, and wireless line control across wireless base stations. Reference numeral 13 denotes a TNS (time division switch).

In the PDC packet communication system, one radio channel is shared by a plurality of mobile terminals, and a plurality of logical data links are established on one physical line.
At the time of handover, the physical line to the data link processing unit that terminates the data link on the MSC side is extended (TN
S), and the conventional method of maintaining the data link with the mobile terminal (circuit switching method in the PDC system) involves switching to a data link with another mobile terminal that is not moving. become. To avoid this, the data link control procedure when the mobile terminal 10a moves from the service area of the data link processing unit 14a to the service area of the data link processing unit 14b is as follows:
(1) I frame transmission / reception between the mobile terminal 10a and the data link processing unit 14a, (2) the mobile terminal 10a moves to the service area of the data link processing unit 14b, and (3) the mobile terminal 10a and the data link processing unit 14b. (4) The data link processing unit 14b takes over the signal to the data link control unit 15 because the data link with the mobile terminal 10a has not been established, and
(5) The data link control unit 15 performs authentication with the mobile terminal 10a to confirm the validity of the I frame. (6) The data link control unit 15 checks the old data link of the mobile terminal 10a. The link information of the old data link is taken over by the new data link, and a data link is established between the mobile terminal 10a and the data link processing unit 14b. (7) The next I link is established between the mobile terminal 10a and the data link processing unit 14b. Frame transmission and reception. This data link control procedure
The data link control unit has a table that stores information about the correspondence between each data link and the mobile terminal that terminates there and the state of the data link, and takes over information about frames that cannot be recognized by the data link processing unit between data links. To realize link switching.

[0005]

The conventional wireless packet transmission system and the wireless logical link control are configured as described above, and a new link is set even if the mobile station moves through the service area (handover). Communication can be performed without any problem. However, the mobile station does not transmit the upstream (from the mobile station to the base station controller, hereinafter simply referred to as “uplink”) frame, and transmits the downstream (from the base station controller to the mobile station, hereinafter simply referred to as “downstream”) frame. When the mobile station moves (handover) in the service area in the standby state and then transmits a downlink frame from the base station control device to the mobile device, the base station control device moves the mobile device to another service area. Because the base station controller transmits the frame to the old data link, the problem of retransmission due to the undelivered transmission frame occurs. There was a problem of being opened.

A wireless packet transmission system according to the present invention has been made in order to solve the above-described problems, and improves the transmission efficiency of the entire communication and establishes a wireless logical link between a mobile station and a base station controller in a service area. The purpose is to maintain it regardless of movement.

[0007]

A radio packet transmission system according to the present invention manages a mobile station, a radio base station communicating with the mobile station, and a plurality of the radio base stations to transmit a packet to the mobile station via a radio link. In a multi-channel access wireless packet transmission system including a base station controller that communicates with a network in units of frame units, the mobile device includes a frame transmission mechanism for transmitting a Receive Ready (RR) frame. When the mobile station moves to the service area of another wireless base station in a packet waiting state after transmission to the wireless base station, the mobile station transmits an RR frame to the base station controller via the wireless base station to which the wireless base station has moved, and performs base station control. The device is provided with a frame detection mechanism for detecting an RR frame, and when the base station control device detects the RR frame, the base station control device shifts the frame. The transmission frame is transmitted to the mobile device via the wireless base station in the service area where the motive has moved.

[0008] Furthermore, the mobile station moves to the service area of another radio base station, and as a RR frame, Pol =
1 and send Po when there is no response from the base station controller.
A mobile station that retransmits a frame with 11 = 1.

Still further, the radio base station is a radio base station for notifying the base station control device of the movement from the mobile station in response to a channel assignment request from the mobile station newly moved to its own service area, Upon receiving the movement notification, the base station control device starts an operation of transmitting a transmission frame to the corresponding mobile station.

Furthermore, the radio base station notifies the base station controller of the movement of the mobile station from the mobile station to which the mobile station has moved, and notifies the base station control apparatus of the mobile station if there is no available channel. Is a radio base station that responds to the rejection of channel assignment.

Further, when the base station management device receives the movement notification of the mobile station from the radio base station, the base station management apparatus restarts the retransmission timer for transmitting the frame to the corresponding mobile station, waits, and transmits the notification via the radio base station. The base station management device performs frame transmission.

[0012] Alternatively, a mobile station, a radio base station communicating with the mobile station, and a base station control for managing a plurality of the radio base stations and dividing a packet with the mobile station in frame units of a radio link layer to communicate with a network. In a multi-channel access wireless packet transmission system comprising a device, the base station control device includes a frame simultaneous transmission mechanism for transmitting a frame in a broadcast format to a mobile station in a packet waiting state which has finished transmitting to the wireless base station. When there is no acknowledgment from a mobile station in a standby state, the base station control device simultaneously transmits a transmission frame to the mobile station via a plurality of wireless base stations to be managed.

Further, the mobile station is provided with a frame transmission mechanism for transmitting an RR frame as required, and notifies the base station controller of the presence or absence of the RR transmission mechanism. In response to the notification of the presence / absence of the RR transmission mechanism from the user, if there is no acknowledgment, the user selects whether to transmit the transmission frame to the mobile station via the radio base station in the predetermined service area or perform the frame simultaneous transmission I did it.

Further, the base station control device selects between the response transmission of the RR frame and the simultaneous transmission of the frame via the corresponding radio base station depending on the traffic of the radio base station to which the mobile station newly belongs. I did it.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. The base station controller receives a signal from the mobile station.
A description will be given of a wireless packet transmission system that detects movement of a service area by receiving an active Ready (RR) frame, and continuously performs frame transmission via a destination wireless base station after the detection. FIG. 1 is a diagram showing a configuration example of a wireless packet transmission system of the present invention. In the figure,
Reference numerals 1a to 1f denote mobile devices, each of which has a frame transmission mechanism for transmitting an RR frame. 2a
2d are base stations that are connected to the mobile station via a radio channel and control transmission of a plurality of mobile stations, and 3a and 3b are base station controllers that control transmission and reception of packet data between the mobile station and the network. An RR frame detection mechanism is provided. Reference numeral 4 denotes a data network for transmitting packet data. Reference numerals 5a to 5d denote transmission lines connecting the radio base station and the base station control device, and reference numerals 6a to 6b denote transmission lines connecting the base station control device and the network.

FIG. 2 and FIG. 3 are diagrams showing the sequence of the wireless packet transmission system in the present embodiment. FIG. 2 shows a case in which area information obtained by a mobile station is obtained from information on a control channel broadcast by a radio base station.
Indicates a case where the area information obtained by the mobile station is obtained from a frame broadcast by the base station control device.
In FIG. 2 and FIG. 3, I is “Information”.
, RR stands for “Receive Ready”, UI stands for “Unnumbered Information”, and the parentheses of I and RR indicate the transmission / reception sequence number (RR).
Means only the receiving sequence number). P and F are each P
means the all and Final bits. The dashed arrows indicate slots in the radio access control layer, and the solid arrows indicate frames in the radio logical link control layer. FIG. 4 shows base station controllers 3a and 3b according to the present embodiment.
It is a flowchart figure which shows the transmission / reception operation | movement. In the operation flowchart shown in the figure, a step S102 is provided for receiving the RR frame from the mobile device 1 and updating the location management information.

Based on the above sequence diagram and flowchart, the base station control apparatus in the present embodiment detects the movement of the service area by receiving the RR frame from the mobile station, and after the detection, moves to the new destination radio base station. A wireless packet transmission system that performs frame transmission via a station will be described. In FIG. 2, the downlink I from the base station controller 3a is
It is assumed that the mobile device 1a, which is the transmission partner, has moved from the service area of the wireless base station 2a to the service area of the wireless base station 2b while transmitting the frame 20. In this case, as shown in FIG. 2, since the I frame has not been transmitted, the base station controller 3a sets
The I frame 21 is transmitted again. In the undelivered state, the I-frame is retransmitted for the preset maximum number of retransmissions. During this time, the mobile device 1a transmits the position information notification 22 (the position information notification from the destination base station 2b). , Location information notification 25 transmitted by the base station controller of FIG.
May be detected, and it is detected that the mobile terminal has moved from the service area to a different service area. Detecting the movement of the service area, the mobile device 1a
Transmits the RR frame 23 to the base station controller 3a via the destination wireless base station 2b.

The base station controller 3a uses an RR frame detection mechanism to detect in step S100 that the RR frame 23 has been transmitted via the radio base station 2b (hereinafter, referred to as the RR frame 23).
The description of the steps is omitted), the position information is compared with the previous position information in the next S101, and the position information is updated in S102. The base station control device 3a converts the I frame 20 transmitted through the radio base station 2a and the retransmitted I frame 21 into
After confirmation in S103 and S104, this time the wireless base station 2b
The I-frame 24 is transmitted again through S105 via S105.
In this way, the base station control device detects the movement of the service area by receiving the RR frame from the mobile device, and after the detection, the frame transmission can be performed via the destination wireless base station. Although the above operation has been described as the sequence shown in FIG. 2, as shown in FIG. 3, the mobile device knows the service area information from the position information notification frame (UI) from the base station control device 3a. However, the overall operation is the same. Therefore, the description of the detailed operation in this case is omitted.

Embodiment 2 In the present invention, a system in which an RR frame can be reliably received by a base station controller will be described. The configuration of the wireless packet transmission system according to the present embodiment is the same as that shown in FIG. FIG. 5 shows a sequence operation indicating information exchange between the mobile station and the base station controller in the present embodiment.
5 is a flowchart showing the operation of the mobile device. In this embodiment, after detecting that the service area has changed in the mobile device, S205 is provided for transmitting the RR frame to the base station control device with the P = 1.

In FIG. 5, the operation is the same as that of the first embodiment up to the sequence of receiving position information notification 22, and the mobile station uses this position information notification 22 to determine that it has moved from the service area to a different service area. To detect. Upon detecting this movement, in S205, the mobile station sets the RR frame 30 to P = 1, which means a delivery confirmation in the future.
To the base station control device 3a.
, And starts a retransmission timer in S206. If this RR frame 30 is transmitted,
As shown by the X mark, even when the frame is lost due to an error, the RR frame 31 is transmitted to confirm the delivery. That is, in S206, the reception confirmation of the RR frame of F = 1 corresponding to the RR frame from the base station control device 3a is performed. If the RR frame is not received, the RR frame of P = 1 is passed through S207 and S208 and again in S205. 31 is transmitted.

Thus, when the RR frame transmission from the mobile station is set to P = 1, the RR frame is transmitted, and when the F = 1 RR frame is not received from the base station controller, the P = 1 RR frame is transmitted again. By doing so, the base station control device can reliably detect that the mobile device has moved, and perform frame transmission via the destination wireless base station.

Embodiment 3 FIG. In this embodiment, when the mobile device detects movement of the service area and there is no free channel for packet transmission in the destination service area, the mobile device clearly indicates the establishment of a radio logical link in the packet channel establishment request. Then, the specified radio base station notifies the base station controller of the handover of the mobile station, the notified base station controller updates the location management information of the mobile station, and A wireless packet transmission system that restarts when the retransmission timer for the device has been started will be described. FIG. 7 shows an operation of a sequence for transmitting and receiving information between the mobile station and the base station control apparatus and between the mobile station and the radio base station in the present embodiment, and FIG. 8 is a flowchart showing an operation of the radio base station. 7 and 8,
RAch is a slot in the wireless access control layer for transmitting and receiving wireless packets.

After receiving the position information notification 22, the mobile station transmits an RR frame to the base station control device via the destination base station 2b as described in the above embodiments. At this time, prior to the transmission, the RACH assignment request 4
0 is transmitted to the radio base station 2b. RAc by S300
The wireless base station receiving the h allocation request 40
Search for a free RACh, and if there is a free RACh, transmit the RACh assignment to the mobile station in S305. If the radio base station is used for packet transmission of another mobile station and has no vacancy, the radio base station first checks the RACh assignment request 40 in S302 to determine whether or not a link is being established. If a link is being established, S
The handover notification 41 is transmitted to the base station controller by 303, and the rejection of the RACH assignment 4 is performed by S304.
2 is returned to the mobile device.

When the base station controller receives the handover notification from the radio base station, it temporarily stops the retransmission timer for the mobile station and restarts it.
After confirming the reception, the I-frame that has not arrived is transmitted. Thus, even if the service area immediately after the movement does not have an empty RAch, the mobile station clearly specifies the establishment of the radio logical link in the packet channel establishment request, and the specified radio base station notifies the radio base station to the base station controller. The base station controller notified of the handover of the mobile station,
By updating the location management information of the mobile station and restarting the retransmission timer for the mobile station if it has been activated, the base station control device can execute the mobile station operation without disconnecting the data link once set. The movement of the service area is reliably detected, and after the detection, the frame transmission can be performed via the wireless base station of the movement destination. If there is an empty channel, the channel is immediately allocated to the mobile station that has moved, a handover notification is issued to the base station controller, and the retransmission timer of the base station controller is reset. This will ensure continuity.

Embodiment 4 In the present embodiment, the base station control device does not receive acknowledgment at the time of downlink frame transmission, and performs a radio packet for transmitting the frame to all service areas via the radio base station to be managed at the end of a predetermined number of retransmissions. The transmission system will be described. Even with this method, it is possible to increase the continuity of frame transmission. FIG. 9 shows an operation of a sequence showing information exchange between the mobile station and the base station controller in the present embodiment, and FIG. 10 is a flowchart showing an operation of the base station controller.

Immediately after a mobile station existing in the service area A of the radio base station 2a moves to the service area D of the radio base station 2d, a frame 50 of I (1,6), P = 1 is transmitted to the mobile station. In this case, at this point, the base station controller cannot confirm the response to the I frame in S401 (delivery confirmation) because the movement of the area is not known and cannot respond to I (1,6). ), The frame with P = 1 is undelivered.

I frame (In this embodiment, I (1,
6), when the delivery confirmation of P = 1) has not been obtained, the base station control apparatus retransmits the frame a predetermined number of times in S408 through S402, S404, and S406 based on the radio logical link control procedure (S408). Frames 51 and 5
Perform 2). If the delivery is not confirmed in S401 despite the retransmission of the frame a predetermined number of times, all service areas A, S, and
For B, C, and D, I (1, 6), P
= 1 are simultaneously transmitted. In this way, the base station controller cannot receive the delivery confirmation when transmitting the downlink frame,
At the end of the predetermined number of retransmissions, the above-described frame is simultaneously transmitted through the radio base stations of all service areas to be managed, so that even if the mobile station is moving, the mobile station passes through the destination radio base station. Then, the above I (1,
6) The frame 53 with P = 1 can be received. After that, the base station controller detects the acknowledgment of transmission from the mobile station, and after the detection, performs frame transmission via the destination radio base station. be able to.

Embodiment 5 In the present embodiment, as a radio logical link maintenance method in a case where the base station controller cannot confirm the delivery at the time of transmitting a down frame due to the movement of the service area of the mobile station, an RR transmission function when the service area moves when the mobile station identifier is assigned A wireless packet transmission system that determines whether or not the wireless packet transmission apparatus has the above and determines a maintenance method will be described. FIG. 11 is a diagram showing an operation of a sequence showing information exchange between the mobile station and the base station controller in the present embodiment, and FIG. 12 is a flowchart showing an operation of the base station controller.

Prior to the establishment of a radio logical link with the base station controller, the mobile station transmits the RR when moving to the service area via the radio base station of the service area to which the mobile station belongs.
A TEI (mobile unit identifier used in radio logical link control) allocation request 60 is transmitted to the base station controller with or without the transmission function. After receiving the TEI allocation request 60 in S500, the base station controller
It is determined whether or not there is a resource (mobile device identifier) to be allocated according to 1; if not, a TEI allocation rejection is returned in S503. If there is a resource (mobile device identifier), the mobile terminal determines whether or not there is an RR transmission function when the mobile device moves to the service area, based on the TEI allocation request received in step S505 through steps S502 and S504. In this case, it is held so that simultaneous transmission at the time of retransmission is not performed in S506. If the RR transmission function is not provided, it is held so that simultaneous transmission at the time of retransmission is performed in S507, and the TEI allocation 61 including the mobile station identifier allocated in S508 is transmitted to the mobile station.

In this way, the RR transmission function of the mobile station when moving to the service area is checked at the time of TEI assignment, and if the function is provided, the RR frame is transmitted from the mobile station when the service area is moved and the function is transmitted. If there is no, a method of maintaining the wireless logical link, such as performing simultaneous transmission at the time of retransmission, can be selected. That is, the present embodiment is also applicable to a system in which a mobile device has an RR frame transmission function and a mobile device having no RR frame transmission function.

Embodiment 6 FIG. In the present embodiment, as a radio logical link maintaining method when the base station control device cannot confirm the delivery at the time of transmitting a downlink frame due to the movement of the service area of the mobile device, the traffic condition of the uplink radio packet when the mobile device identifier is assigned A wireless packet transmission system determined according to the following will be described. FIG.
5 is a flowchart illustrating an operation of the base station control device.

As in the previous embodiment 5, the mobile station sets the radio logical link with the base station controller before setting the radio logical link.
T via the wireless base station of the service area to which
An EI assignment request is transmitted to the base station controller. After receiving the TEI allocation request in S600, the base station control device determines in S601 whether there is a resource (mobile device identifier) to be allocated.
603 returns a TEI assignment request. If there is a resource (mobile unit identifier), the traffic goes through S602 and S604, and the traffic is low in S605 according to the traffic situation in the uplink direction. If it can be performed smoothly, it is held in S606 so that simultaneous transmission is not performed during retransmission. If the traffic is high and the mobile station cannot easily perform RR transmission in the service area of the destination, it is held so that simultaneous transmission at the time of retransmission is performed in step S607, and the mobile station identifier allocated in step S608 is included. Send the TEI assignment to the mobile station.

In this way, the traffic of the radio packet in the uplink direction is checked at the time of TEI allocation, and if the traffic is low, the R from the mobile station at the time of moving to the service area is checked.
When the traffic is high by transmitting the R frame, it is possible to select a method of maintaining the wireless logical link, such as performing simultaneous transmission at the time of retransmission.

[0034]

As described above, according to the present invention, even when a mobile station in a packet waiting state moves to a service area after completing transmission, the mobile station controls the RR frame after moving. The base station control device detects that the mobile station has moved to the service area by receiving the RR frame, and continues the frame transmission. Therefore, the radio logical link to the mobile device can be maintained. is there.

Furthermore, when the mobile station in the packet waiting state moves to the service area after the transmission is once completed, the mobile station transmits the RR frame as P = 1 to the base station controller after moving, and F =
When one RR frame cannot be received, the RR frame is transmitted again. Therefore, the base station controller has an effect that the RR frame can be reliably received and the radio logical link to the mobile device can be maintained. is there.

Further, even if the mobile station in the packet waiting state moves in the service area, and there is no vacant channel in the destination service area immediately after the movement, the radio base station transmits a handover notification to the base station controller. Therefore, the base station control device detects the movement of the mobile station in the service area, so that there is an effect that the wireless logical link to the mobile station can be maintained.

Further, even if the mobile station in the packet waiting state moves in the service area and there is no vacant channel in the destination service area immediately after the movement, the radio base station transmits a handover notification to the base station controller. do it,
Since the base station control device detects the movement of the service area of the mobile station, resets the retransmission timer and starts again, the radio logical link to the mobile station can be maintained.

Further, when the mobile station in the packet waiting state moves in the service area, the base station control apparatus performs the simultaneous retransmission of the frame to all the service areas in the last trial of the retransmission of the frame. Therefore, the mobile station can surely receive the frame from the base station control device, and has an effect of maintaining the wireless logical link to the mobile station.

Further, when the mobile station in the packet waiting state moves in the service area, the base station controller determines whether or not the mobile station has the function of transmitting the RR frame when moving to the service area, and determines whether the mobile station has the function of transmitting the RR frame. Since the link maintenance method is selected, there is an effect that efficient wireless ethical link control can be performed even when different methods are mixed in the transmission mechanism of the mobile device.

Further, when the mobile station in the packet waiting state moves in the service area, the base station controller selects the radio logical link maintenance method according to the traffic of the radio packet in the upward direction. There is an effect that good wireless logical link control can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless packet transmission system according to the present invention.

FIG. 2 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the first embodiment.

FIG. 3 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the first embodiment.

FIG. 4 is a flowchart illustrating an operation of the base station control device according to the first embodiment.

FIG. 5 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the second embodiment.

FIG. 6 is a flowchart showing an operation of the mobile device in the second embodiment.

FIG. 7 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the third embodiment.

FIG. 8 is a flowchart illustrating an operation of a radio base station according to Embodiment 3.

FIG. 9 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the fourth embodiment.

FIG. 10 is a flowchart illustrating an operation of a base station control device according to the fourth embodiment.

FIG. 11 is a diagram showing a sequence in a wireless section of the wireless packet transmission system according to the fifth embodiment.

FIG. 12 is a flowchart illustrating an operation of the base station control device according to the fifth embodiment.

FIG. 13 is a flowchart illustrating an operation of the base station control device according to the sixth embodiment.

FIG. 14 is a configuration diagram showing a radio logical link control procedure in a conventional example.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e, 1f Mobile device, 2a,
2b, 2c, 2d Radio base station, 3a, 3b Base station controller, 4 networks, 5a, 5b, 5c, 5d,
6a, 6b Transmission line, 10a, 10b Mobile terminal.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 7/24-7/26 H04L 12/54-12/62 H04Q 7/00-7/38

Claims (8)

(57) [Claims] 1. A mobile station, a radio base station communicating with the mobile station, and a plurality of the radio base stations are managed to divide a packet with the mobile station in units of a frame of a radio link layer and communicate with a network. In a multi-channel access wireless packet transmission system including a base station controller, a mobile station is provided with a frame transmission mechanism for transmitting a frame of Receive Ready (RR), and is in a packet waiting state after transmission to a radio base station. Then, when the mobile station moves to the service area of another radio base station, an RR frame is transmitted to the base station controller via the destination radio base station, and the base station controller detects the RR frame. When a mechanism is provided to detect the RR frame,
A wireless packet transmission system, wherein a transmission frame is transmitted to the mobile device via a wireless base station in a service area to which the mobile device has moved. 2. The mobile station moves to a service area of another radio base station and transmits it as an RR frame as Poll = 1, and when there is no response from the base station controller, Poll = 1.
2. The wireless packet transmission system according to claim 1, wherein the mobile station retransmits the frame. 3. A radio base station, which, in response to a channel allocation request from a mobile station newly moved to its own service area, notifies a base station controller of a movement from the mobile station, and 2. The wireless packet transmission system according to claim 1, wherein the station controller receives the movement notification and starts an operation of transmitting a transmission frame to a corresponding mobile station. 4. The radio base station notifies a base station controller of a movement of a channel from a mobile station to which the mobile station has moved, and notifies the base station control apparatus of the movement of the mobile station. 4. The wireless packet transmission system according to claim 3, wherein the wireless base station responds to the rejection of the channel assignment. 5. The base station management device, upon receiving a movement notification of a mobile station from a radio base station, restarts a retransmission timer for frame transmission to a corresponding mobile station and waits for the transmission. 2. The wireless packet transmission system according to claim 1, wherein the base station management device performs frame transmission. 6. A mobile station, a radio base station which communicates with the mobile station, and a plurality of the radio base stations are managed to divide a packet with the mobile station for each frame of a radio link layer and communicate with a network. In a multi-channel access wireless packet transmission system comprising a base station controller, the base station controller transmits a frame in a broadcast format to a mobile station in a packet waiting state which has finished transmitting to the wireless base station. With a mechanism, the base station control device, if there is no delivery confirmation response from the mobile station in the standby state, so as to simultaneously transmit a transmission frame to the mobile station via the plurality of managed radio base stations. A wireless packet transmission system, comprising: 7. The mobile station may be provided with a Receive as required.
The mobile station includes a frame transmission mechanism for transmitting a Ready (RR) frame.
Notify the presence or absence of the R transmission mechanism, and the base station controller transmits to the mobile station via the radio base station in the predetermined service area when there is no acknowledgment response in response to the presence or absence of the RR transmission mechanism from the mobile station. 7. The wireless packet transmission system according to claim 6, wherein a selection is made between transmission of a frame and simultaneous transmission of a frame. 8. The radio network controller according to claim 1, wherein the base station controller selects whether to transmit an RR frame response or a simultaneous frame transmission via the corresponding radio base station depending on the traffic of the radio base station to which the mobile station newly belongs. The wireless packet transmission system according to claim 7, wherein: