JPH10243458A - Radio packet transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission system with an excellent transmission efficiency where a transmission slot from a mobile set is not interrupted and a small buffer capacity is enough. SOLUTION: The system adopts a multi-channel system and is made up of a mobile equipment 4, a plurality of radio base stations 3, and a base station controller 2 that manages the base stations, divides packets in the unit of frames of a radio link layer and communicates with a network. In the case of dividing each packet in the unit of frames of the radio link layer, dividing each frame in the unit of slots for transmission control, succeeding frame identification information denoting the presence of a succeeding frame being a division of data for a same transmission object is added to a final slot, and when the radio base station 3 detects the succeeding frame identification information in the final slot of the frame from the mobile set 4, the base station 3 sends information equivalent to permission of slot continuous transmission to the mobile set 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel access type radio packet communication in which a plurality of mobile stations share one radio channel in a radio section between a mobile station and a radio base station in a mobile data communication system. In improving the data transmission efficiency.

[0002]

2. Description of the Related Art In consideration of error control in a radio section, an ARQ (Auto Repeat) is set in an upper layer of a radio access layer.
Request), there is packet data communication for performing data link control. Also, as a random access method in the conventional wireless packet communication, IEICE RCS
91-30 "Airline Control Mobile Communication Random Access System with Partial Echo (hereinafter referred to as ICMA-PE)".

[0003] This ICMA-PE will be described. In the vacant line control method, “vacant / occupied” of the uplink channel is represented by an “vacant line / prohibited” bit, and the collision detection type represents non-reception due to signal collision with a collision detection indication bit. In order to increase the so-called uplink signal transmission efficiency from the mobile device to the radio base station, transmission from the mobile device other than signals surviving by the capture effect at the time of signal collision is stopped. For this purpose, it is necessary for the mobile station itself to determine whether or not its own transmission signal has been received by the base station, and to determine whether to continue or stop transmission according to the result. For the determination at the mobile device, a method of returning all the uplink received signals from the base station as it is as a downlink signal can be considered, but in this method, the downlink signal transmission from the original wireless base station to the mobile device is suppressed, This leads to a decrease in transmission efficiency.

In the ICMA-PE, in addition to the conventional "vacant line / prohibited" and "reception / non-reception" information, a signal obtained by performing a certain process on a base station reception signal is transmitted back to the mobile station as a partial echo. The most characteristic feature is that the mobile station autonomously determines the success or failure of transmission of its own transmission signal and controls the transmission. By reflecting the content of the transmitted signal as much as possible as a partial echo and using a short bit string that does not match between multiple mobile stations, while ensuring downlink signal transmission capacity, even in the event of uplink signal collision, signals The transmission of the transmitting mobile station can be stopped, and only the mobile station that has received the signal can continue the transmission.

FIG. 13 shows a downlink signal format. For each slot, a collision control bit composed of an "empty line / inhibit" signal (I / B), a "reception / non-reception" (R / N), and a partial echo (PE) is provided. For the partial echo, a CRC check bit or the like can be used. FIG. 14 shows an uplink signal format. The feature is that information W relating to the message length for each slot, that is, information for notifying the base station how many slots of data (frames) to be transmitted after the next slot is added. Using the information W, the base station determines the I / B of the collision control bit portion of the next slot.

[0006] TDMA (Time Division Multiple Access)
In the application of the above, the data is divided into one slot length, and if an error detection check bit or a CRC check bit is added to the information signal for each slot length, the "reception / non-reception" and the determination of the partial echo can be determined by the slot timing. Since transmission control can be performed for each layer, transmission control closed to layer 1 can be performed, which is suitable for hierarchical transmission control. FIG. 15 shows an operation flowchart of the base station. If no signal is received from the mobile station, a bit pattern of I is set to I / B, N is set to R / N, and an all-zero bit pattern is set to PE, and transmission from all mobile stations in the next slot is permitted. When a signal from the mobile device is received,
R is set to R / N, and the result of performing certain processing on the received data is set to PE. At this time, the I / B is set according to the message configuration information W. That is, a bit pattern of I is set if the received data is the last frame, and a bit pattern of B is set if the received data is continued. After setting the I / B, R / N, and PE in this way, they are transmitted as collision control bits together with the downlink information. If the signal from the mobile station is not received, set R / N to N and I / B to I, stop transmission of the mobile station, and permit new transmission of all mobile stations in the next slot. I do.

FIG. 16 shows a flowchart of the operation of the mobile station. The transmission timing is slotted in synchronization with the reception signal. The mobile station that has generated the signal starts transmission at the transmission timing immediately after receiving the transmission permission I bit pattern. R / N of collision control bit of next downlink slot
Is R, if the PE matches the data transmitted by the own station after performing a certain process, it is considered that the first frame has been successfully transmitted, and if the message continues, the transmission is continued. If the message is only one frame, the transmission is completed. If the R / N is R and the PEs do not match, or if the R / N is N, the transmission fails in the case of a recycle over in which recycle is performed after a random delay.

FIG. 17 shows an example of a sequence in a wireless section. The mobile devices #a and #b are connected to DATA # a-1 (F1 =
1, F2 = 0), DATA # b-1 (F1 = 1, F2 =
0) is generated, after receiving that the I / B portion of the collision control bit is a bit pattern representing I, the mobile devices #a and #b simultaneously have DATA # a-1 (F1 =
1, F2 = 0), DATA # b-1 (F1 = 1, F2 =
0), signal collision occurs. DATA # a-1 (F1 = 1, F2 = 0) transmitted by mobile device #a is received, and DATA # b-1 (F1 = F1 =
When (1, F2 = 0) is not received, the mobile station #a receives the collision control bits (B, R, a (1)) and knows that the own station transmission data has been received. The following data DATA # a
-2 (F1 = 0, F2 = 0), DATA # a-3 (F1
= 0, F2 = 0..., And the collision control bits (I,
R, a (n)), the mobile station #a sets DATA # a-n (F1
= 1, F2 = 1), the transmission is completed. On the other hand, the mobile station #b knows that the transmission signal of its own station has become non-reception by receiving (B, R, a (1)), stops transmission, and waits for retransmission. After receiving the fact that the I / B portion of the collision control bit is a bit pattern representing I, the mobile device #b then sets DATA # b-1 (F1 = 1, F2 = 0).
To resend.

[0009]

In the conventional wireless packet communication, when transmitting an IP packet or the like, the IP packet is divided into a plurality of frames in order to improve the transmission efficiency at the time of retransmitting the frame due to the occurrence of an error in the wireless section. It is divided and transported. That is, in the transmission of the IP packet from the mobile device #a toward the radio base station, access start, transmission, and access end are repeatedly performed for each transmission frame. For this reason, after the transmission of one transmission frame is completed, if a frame is transmitted from another mobile station #b at the start of access to the next transmission frame, a frame collision occurs and the other mobile station #b
If the transmission starts at the point b, the mobile station #a performs retransmission after the transmission of the mobile station #b is completed, causing a transmission delay of the transmission frame. As a result, the transmission delay of the IP packet significantly increases, and the transmission efficiency increases. Is reduced. Also,
Since transmission frames are mixedly received from a plurality of mobile stations on one TDMA slot, the base station control apparatus sets up an independent transmission frame for each mobile station when assembling a transmission frame from a radio base station into an IP packet. Also, there is a problem that the required IP packet assembling buffer is required and the buffer amount becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve the transmission efficiency of the entire communication and to reduce the packet assembling buffer of the base station controller.

[0011]

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 and from the mobile station. In a system configuration of a multi-channel access system including a base station controller that communicates with a network by dividing the frame by a radio link layer, a packet is divided by a frame of a radio link layer, and the frame is divided by a slot. When performing transmission control by adding subsequent identification information indicating that there is a subsequent frame obtained by dividing the same packet to this slot, the radio base station detects the subsequent identification information in the last slot of the frame from the mobile device. The base station sends information corresponding to the slot continuous transmission permission to the mobile device.

Alternatively, a mobile station, a radio base station which communicates with the mobile station, and a base station which manages a plurality of these radio base stations and divides a packet with the mobile station by a frame unit of a radio link layer to communicate with a network. Multi-channel
In an access type wireless packet transmission system, a mobile station performs handover from a wireless base station with which it has just communicated to a current wireless base station, and the current wireless base station has the same base station controller as the wireless base station with which it has just communicated. , The mobile station transmits data subsequent to the data of the slot belonging to the frame transmitted to the wireless base station that has just communicated with the current wireless base station.

Alternatively, a mobile station, a radio base station that communicates with the mobile station, and a base station that manages a plurality of the radio base stations and divides a packet with the mobile station in units of frames of a radio link layer to communicate with a network. In a wireless packet transmission system of a multi-channel access system comprising a station controller, priority reception information for instructing priority reception with respect to a frame is determined, and the radio base station receives priority reception information from the base station controller, The base station sends information corresponding to the slot continuation transmission permission to the mobile station specified in the reception information.

Alternatively, a mobile station, a radio base station which communicates with the mobile station, and a base station which manages a plurality of the radio base stations and divides a packet with the mobile station in units of frames of a radio link layer to communicate with a network. In a wireless packet transmission system of a multi-channel access system including a station controller, a mobile station transmits a packet to a predetermined ARQ (Auto Repeater).
(t Request) The mobile station transmits the information divided into the information field length of the frame.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. A description will be given of a system in which transmission target data transmitted from a mobile device is ARQ as a frame unit of a wireless link layer, and transmission is continuously performed over an ARQ frame until all transmission target data has been transmitted. FIG. 1 is a system configuration diagram of the wireless packet access system of the present invention. In FIG. 1, reference numeral 1 denotes a LAN. A base station controller 2 controls a plurality of wireless base stations and controls transmission and reception of data between the LAN 1 and the mobile station. A wireless base station 3 is connected to the mobile station wirelessly and controls transmission of the plurality of mobile stations. Bureau. 4 is a wireless base station 3 for transmitting data from a data terminal wirelessly.
And a data terminal 5 connected to the mobile device 4 for transmitting data transmitted from the base station 3 to the data terminal. Reference numeral 6 denotes an existing data terminal connected to the LAN 1.

FIG. 2 shows that the mobile station 4 shown in FIG.
To TDMA frames transmitted and received in the wireless section with
5 shows an example of a packet dividing method. In FIG. 2, the transmission target data is an IP packet, which is composed of 21 IP headers and 22 IP data (user data). On the other hand, in the ARQ wireless packet transmission system, the ARQ transmission frame unit is determined, and only one data of the 23 Info areas can be transmitted in one ARQ frame. Therefore, the IP packets (21 and 22)
In some cases, the data is divided into a plurality of ARQ frames and transmitted. Transmission between the mobile station 4 and the radio base station 3 is performed using TDMA.
Since the division is performed in units of slots, the information of the ARQ frame is further divided into DATA portions of 28 TDMA slots. Here, F1 of 24 and F2 of 25 are information on the ARQ frame, and F1 = 1 and F2 =
0 indicates the head unit (slot) when the ARQ frame is divided into a plurality of slots, F1 = 0, F2 = 0 indicates an intermediate unit (slot), and F1 = 0, F2 = 1 indicates the last unit (slot). Indicates that transmission of the message ends. W of 27 is message length information, 28
Is an area for accommodating data in an actual ARQ frame. In the present embodiment, an inter-frame continuation flag is newly provided as S of 26 in addition to the information of F1 and F2. That is, if S = 1, it means that a slot obtained by dividing a continuous ARQ frame continues, and if S = 0, it means that transmission ends in that frame.

FIG. 3 is a sequence diagram of the wireless packet transmission system according to the present embodiment. In FIG. 3, a downlink signal from the radio base station to the mobile devices #a and #b means a broadcast signal from the radio base station. I / B means "empty line / inhibited" state, and I and B mean "empty line" and "inhibited" state, respectively. R / N means “reception / non-reception” information, and R, N, and X are “reception”, “non-reception”, and “no meaning”, respectively.
Means PE means partial echo, and PE = a means that the data of mobile station #a has been received. Also, in FIG. 3, an uplink signal from the mobile device #a to the radio base station means data of an ARQ frame, and F1, F2, S
Is a unit identification which is a frame. FIG. 4 is a flowchart showing a transmission / reception operation of radio base station 3 in the present embodiment. Steps S104 and S10 for receiving continuation information S26 from mobile device 4 and generating a control signal
6 are provided.

Based on the above sequence diagram and flowchart, A of the wireless packet system in the present embodiment will be described.
The operation of continuous transmission over RQ frames will be described.
In FIG. 3, #a of the mobile station 4 indicates channel vacancy information (I / B = I, R / N = X, PE = X) from the radio base station 3.
31 and the IP packet (21+
22), an ARQ frame is assembled and the first unit (F1 = 1, F2 = 0, S = X, X is 1,
The first slot of the packet 32 is transmitted with "0" being optional. The wireless base station transmits the downlink slot 33 through steps S100, S101, S103, S106, and S109 as the normal operation in FIG. Hereafter, mobile device #
“a” transmits the slot 34 carrying the data 28 to the wireless base station 3. The mobile station #a receives the i in one ARQ frame.
Even if the transmission of the nfo23 information ends, the IP packet (21
+22), the inter-frame continuation flag S26 indicating that the IP packet continues in the last slot is set to 1
Is set, and the slot 35 is sent. In response, the wireless base station 3 performs the next ARQ in S103, which is a new flow part in FIG.
Knowing that the frame is coming, the information is set in S106 and the packet 36 is transmitted. The mobile unit 4 will be in the slot 37
, And the slot 38 is transmitted with respect to the last data of the IP packet, and all the transmissions are completed.

That is, even if the last frame is displayed in F1 and F2, the radio base station sends I / B = B to the downlink signal when S displays "there is a continuous ARQ frame". . When the transmission of the ARQ frame for one packet is completed and the end of the ARP frame is also the end of the IP packet, the mobile station #a displays the last frame in F1 and F2 of the last ARQ frame and displays "Continuous AR" in S.
No Q frame "is displayed. The radio base stations are F1, F
If the last ARQ frame indicating that it is the last frame is displayed in 2 and "No continuous ARQ frame" is displayed in S, I / B = I is transmitted to the downstream signal. Thus, continuous transmission of the ARQ frame, that is, transmission in units of IP packets, becomes possible.

Embodiment 2 In the present embodiment, a system will be described in which the same ARQ frame can be continuously transmitted even when a mobile device specific to a wireless system moves in a call zone. The configuration of the wireless system according to the present embodiment is as follows:
It is the same as that shown in FIG. However, the mobile device operates to continuously transmit the ARQ frame. FIG. 5 is a sequence diagram of information exchange between the mobile station 4 and the radio base stations # 1 and # 2 and between the base station controller 2 according to the present embodiment. FIG.
The mobile station #a moves between cells of the radio base stations # 1 and # 2 and performs handover. 6 and 7 are flowcharts showing the operation of mobile station #a in the present embodiment. FIG. 6 shows a case where an ID is obtained from broadcast information on a control channel, and FIG. The case where an ID is acquired is shown.

The operation of continuous transmission of slots in a frame according to the present embodiment will be described with reference to FIG. 5 showing the above-described sequence and FIG. 6 or 7 showing the operation flow.
The channel availability information 41 is received from the radio base station # 1 with which the mobile device #a communicates, and if there is an IP packet to be transmitted, A
The first slot 42 of the RQ frame is transmitted. Upon receiving this, the radio base station # 1 sends the DATA to the base station controller 2.
# 1 43 is transmitted, and the downstream information 44 is transmitted. Thereafter, transmission of data obtained by dividing the IP packet from the mobile device #a continues, and the radio base station # 1 transmits the data to the base station control device 2 by the D.
The transfer of ATA # k is continued. By the way, it is assumed that the mobile device #a moves in the area and enters the area of the wireless base station # 2. The mobile device #a operates according to the flowchart of FIG. 6 or 7 according to the operation of the system, performs a handover, and performs a new radio base station # 2 in steps S201 and S02 of FIG. 6 or S301 and S302 of FIG. From the terminal 45. From this information 45, step S2
03 or S303, the system ID (specific information of the base station controller) is obtained. If it is determined that the system ID is the base station controller 2 that manages the radio base station # 1 before handover, S206 or S306 Transmit the remaining slots 46.

The new radio base station # 2 is now
The operation of extracting A # k + 1 47 and transferring it to the base station controller 2 is continued, and the base station controller 2
When they are collected, they are transferred to the network. Thus, mobile unit #a
Detects the handover from the radio base station # 1 to the radio base station # 2 connected to the same base station controller after transmitting the DATA #k, and then transmits the connected ARQ frame to the radio base station # 2. (DATA # k + 1), the base station controller continuously receives the ARQ frames transmitted from the mobile station #a from the radio base stations # 1 and # 2, assembles them into IP packets, and sends them to the LAN or the like. Transmission is possible and transmission efficiency does not decrease.

Embodiment 3 FIG. In the second embodiment,
The mobile station performs continuous transmission using ID information from the wireless base station of the communication partner. In the present embodiment, continuous transmission of IP packets is performed by another method in consideration of the instability of the communication situation on the mobile device side. FIG. 8 is a sequence diagram of the wireless packet transmission system according to the present embodiment. The mobile device #a in the figure moves between cells of the radio base stations # 1 and # 2 and performs handover. FIG. 9 is an operation flowchart of the base station control apparatus according to the present embodiment, and FIG. 10 is an operation flowchart of the radio base station similarly.

The continuous transmission operation will be described with reference to the above sequence diagram and operation flowchart. In FIG. 8, based on information 61 from radio base station # 1, mobile station #
a starts the transmission of data 62. Thereafter, the same data transmission operation as described in the above embodiment is performed. By the way, if the transmission from mobile device #a is interrupted on the way,
If the base station control device 2 determines in step S405 that is the added flow in FIG. 9 that the frame of the IP packet from the mobile device #a is being received, the process proceeds to step S4.
After a lapse of a predetermined time T1 in 06, a priority reception instruction 66 is transmitted in S407 to a predetermined wireless base station group adjacent to, for example, the wireless base station # 1 or to all managed wireless base station groups. I do. Upon receiving this, each wireless base station outputs downlink information 67 in the format shown in FIG. 10B in step S609 in FIG. 10 and gives priority to reception from mobile station #a. That is, when the wireless base stations # 1 and # 2 receive the “priority reception instruction” signal regarding the empty TDMA slot from the base station control device, the “wireless priority reception” is performed in the wireless section.
(Ip) A notification signal indicating the state is transmitted. FIG.
In (b), I / B / P indicates priority including an empty line / prohibition / mobile station identifier, R / N indicates reception / non-reception, and PE indicates partial echo. The mobile station #a in FIG. 5 is a radio base station # 2
"Empty line priority reception" for empty TDMA slots from
(Ip) When the notification signal indicating the state is received, the continuous A
The RQ frame (DATA # k + 1) is transmitted. Or later,
The continuous transmission of the IP packet is restarted, the retransmission control is eliminated as a whole, and a decrease in transmission efficiency can be prevented.

When receiving the final ARQ frame (DATA # n) from the radio base station # 2, the base station controller assembles an IP packet and transmits it to the LAN.

Embodiment 4 In the above embodiment, the IP packet to be transmitted is divided into a plurality of ARQ frames,
The method of continuously transmitting them has been described. Of course, Embodiments 2 and 3 may use any scheme as long as it is a scheme of closed continuous transmission in units of one transmission frame, regardless of the division of the ARQ frame. On the other hand, in this embodiment, a description will be given of a method in which data to be transmitted is divided into short pieces in advance and set within the range of an ARQ frame on the mobile device side. With this method, IP packets and AR
To make the Q frames correspond one-to-one or N-to-one,
Since the IP packet itself can be transmitted continuously, priority data transmission becomes possible. FIG. 11 is a diagram showing the correspondence between IP packets and ARQ frames in the present embodiment, and FIG. 12 is a flowchart showing the operation of the mobile station in the same manner.

The operation will be described with reference to the above flowchart. The mobile station divides the data to be transmitted into short pieces, and attaches the IP packet of FIG.
2 is generated. This data is activated in step S500 of the flowchart of FIG. 12, and the level of QOS (Quality Of Service) is checked in S501. The data is located in a layer (layer) above the ARQ layer (layer). If it is transmission data that needs to be transmitted in real time, such as a moving image,
The packet data itself is divided into the maximum length of the ARQ frame (S502). That is, a large number of IP data 82 in FIG. 11 are created in advance. Also, transmission data that does not require a real-time system, such as e-mail, is divided into normal packet data lengths (S503). In this flow, the IP
A packet is shown as an example, and the MTU in step S503 is the Maximum Transfer Unit.
In a LAN or the like, the maximum length of an Ethernet frame is set to the MTU value. Thus,
In the wireless packet transmission system, the ARQ frame is a frame unit that is continuously transmitted.

Although the above embodiment has been described with reference to an ARQ system, the present invention may be applied to an ATM cell transmission system called wireless ATM.

[0029]

As described above, according to the present invention, since the frame continuation information is provided so as to be continuously received by the radio base station, packets such as IP packets can be efficiently transported and the transmission efficiency can be improved. As a result, the number of received packet assembling buffers can be reduced because mixed reception of a plurality of IP packets in the same wireless slot is reduced.

Further, even if the mobile station performs a handover to another radio base station connected to the same base station controller during transmission of a packet divided into a plurality of frames, a continuous frame is transmitted as it is, so that there is no waste. There is an effect that packets can be transmitted efficiently without retransmission of unnecessary IP packets and the like.

Furthermore, when no frame is received during reception by the same base station controller, priority is given to a plurality of radio base stations for continuous ARQ frames, and the corresponding radio base station is an empty channel. Is notified to each mobile device,
The mobile station transmits the packet preferentially, eliminating unnecessary ARQ frame collisions and effectively transmitting packets such as IP packets.

Furthermore, since the length of the packet from the data terminal is adjusted to the information field length of the ARQ frame, the packet is transmitted to the radio section without being divided into a plurality of ARQ frames. It has the effect of transmitting packets.

[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 illustrating an example of conversion of a frame format in a mobile station, a wireless base station, and a base station control device of the wireless packet transmission system according to the first embodiment.

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

FIG. 4 is a flowchart showing an operation of the radio base station according to the first embodiment.

FIG. 5 is a sequence diagram of a wireless section, a wireless base station and a base station controller, and a base station controller and a LAN of the wireless packet transmission system according to the second embodiment of the present invention.

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

FIG. 7 is a flowchart illustrating an operation of a mobile device according to the second embodiment.

FIG. 8 is a sequence diagram of a wireless section, a wireless base station and a base station controller, and a base station controller and a LAN of the wireless packet transmission system according to the third embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation of the base station control device according to the third embodiment.

FIG. 10 is a flowchart illustrating an operation of a radio base station according to Embodiment 3.

FIG. 11 is a diagram illustrating an example of conversion of a frame format in a mobile station, a wireless base station, and a base station control device in a wireless packet transmission system according to a fourth embodiment of the present invention.

FIG. 12 is a flowchart showing an operation of the mobile device in the fourth embodiment.

FIG. 13 is a diagram of a downlink slot format from a base station to a mobile station in a conventional example.

FIG. 14 is a diagram illustrating a conversion example of a frame format in a mobile device, a radio base station, and a base station control device in a conventional example.

FIG. 15 is an operation flowchart of a base station in a conventional example.

FIG. 16 is an operation flowchart of a mobile station in a conventional example.

FIG. 17 is a timing chart of signal transmission between a base station and a mobile station in a conventional example.

[Explanation of symbols]

1 LAN, 2 base station controller, 3 radio base station, 4
Mobile terminals, 5 data terminals, 6 existing terminals.

Claims (4)

[Claims] 1. A mobile station, a radio base station for communicating with the mobile station, and a base for managing a plurality of the radio base stations and dividing a packet with the mobile station for each frame of a radio link layer to communicate with a network. In a wireless packet transmission system of a multi-channel access system comprising a station control device, the packet is divided in units of a frame of a wireless link layer,
And when performing transmission control by dividing the frame into slots, the subsequent base station adds subsequent identification information indicating that there is a subsequent frame obtained by dividing the same packet into the slot, A wireless packet transmission system comprising: a base station that, when detecting the subsequent identification information in the last slot of a frame, sends information corresponding to a slot continuous transmission permission to the mobile device. 2. A mobile station, a radio base station which communicates with the mobile station, and a base which manages a plurality of the radio base stations and divides a packet with the mobile station by a frame unit of a radio link layer and communicates with a network. In a wireless packet transmission system of a multi-channel access system comprising a station control device, the mobile station performs handover from a wireless base station with which it has just communicated to a current wireless base station, and the current wireless base station communicates with the immediately preceding communication destination. When it is detected that the wireless base station belongs to the same base station controller as the wireless base station, data subsequent to the data of the slot belonging to the frame transmitted to the wireless base station communicated immediately before is transmitted to the current wireless base station. A wireless packet transmission system comprising a mobile device. 3. A mobile station, a radio base station which communicates with the mobile station, and a base which manages a plurality of the radio base stations and divides a packet with the mobile station by a frame unit of a radio link layer and communicates with a network. In a wireless packet transmission system of a multi-channel access method comprising a station control device, priority reception information instructing priority reception with respect to the frame is determined, and the radio base station transmits the priority reception information from the base station control device. The wireless packet transmission system according to claim 1, wherein the base station sends information corresponding to the slot continuous transmission permission to the mobile station designated by the priority reception information when receiving the information. 4. A mobile station, a radio base station which communicates with the mobile station, and a base which manages a plurality of the radio base stations and divides a packet with the mobile station by a frame unit of a radio link layer and communicates with a network. In a wireless packet transmission system of a multi-channel access system comprising a station controller, the mobile station transmits a packet to a predetermined ARQ (Auto R
A wireless packet transmission system characterized in that the mobile station transmits the data by dividing the frame into information field lengths of an "equest Request" frame.