KR100329683B1 - Mobile communication system - Google Patents

Abstract

A mobile switching station 6-8 having a control function for allocating a TDMA signal and a time slot common / frequency channel common time division CDMA signal on a time axis and a frequency axis, wherein the mobile stations 15-33 are connected to this mobile switching station. A mobile station wirelessly connected to the base stations 11 to 31 by a multiple access method and having a high speed data transmission function is a mobile communication system capable of wirelessly connecting with a wireless base station through a high speed data channel from two adjacent radio base stations to one mobile station. A serial number is assigned to the mobile switching station to which the radio base station is connected to the information of each time slot in the frame of each falling line to be transmitted, and handover processing is performed according to the serial number.

Description

Mobile communication system {MOBILE COMMUNICATION SYSTEM}

The mobile communication system is mainly composed of, for example, a mobile station such as a mobile vehicle-mounted communication device or a mobile portable communication device and a radio base station that communicates with the mobile station via a radio channel. In such a mobile communication system, sharing of the same radio frequency spectrum by different radio systems (hereinafter referred to as frequency channel sharing) is a FDMA (FDMA) scheme or a TDMA scheme and a CDMA scheme. It may be carried out in between. In the CDMA system, frequency channel sharing between different codes has already been carried out. In addition, handover in these systems is already known.

Here, a time slot shared mobile communication system sharing a TDMA signal and a time division CDMA signal in the same time slot is disclosed in Japanese Patent Application Laid-Open No. 8-130766, which is already filed separately. There is no mention of handover in communication channels or high-speed data transmission.

Also, a technique related to a mobile communication system that is used for time slots and also for frequency channel by using a TDMA signal and a time division CDMA signal in the same time slot, and moreover, a wireless local loop (hereinafter referred to as WLL). The synchronization between radio base stations using a semi-fixed communication device (hereinafter referred to as WLL station) is also separately filed by Japanese Patent Application No. Hei 9-188356. However, they do not mention an asymmetric communication channel with different communication capacities of the rising line and the falling line, and moreover, handover in high-speed data transmission.

In addition, Japanese Patent Application No. Hei 9-164817 also describes a technology related to a mobile communication system corresponding to a multimedia wireless environment having an asymmetric communication channel. However, there is no consideration for handover in high speed data transmission.

In addition, US Patent No. 5,363,403 is known as a mobile communication system that shares several CDMA signals. However, the specification does not describe how to handle time division CDMA signals. Other mobile communication systems are also known in U.S. Patent No. 5,511,068, which relates to adaptive filters in time-divided CDMA signal systems, which, in this specification, perform common frequency channel of CDMA and TDMA signals in one time slot. And handover in fast data transmission is not mentioned.

Moreover, international publication WO96 / 06512 is known as a handover handling. However, the present invention deals with a handover in a cellular communication system, and mentions a time-sharing time division of a time division CDMA signal and a TDMA signal in one time slot or a mobile communication system having an asymmetric communication channel. Not.

In addition, US Patent No. 5,410,568 is also known as a communication system applying the TDMA technology to the CDMA communication method. This patent adds a synchronization code to the head of a frame of a CDMA communication, i.e., the burst, and does not introduce a time division CDMA method using a TDMA control channel for frame synchronization. There is no mention of coexistence. In addition, this patent makes no consideration of a communication channel in which the communication capacity of the rising line and the falling line is asymmetric, and does not mention the handover in the high-speed data transmission.

In addition, Japanese Patent Publication No. 6-22364, Japanese Patent Publication No. 7-322332, Japanese Patent Publication No. 8-154269, and Japanese Patent Publication No. 8-280056 are known. have.

However, Japanese Patent Laid-Open Publication No. 6-22364 discloses a technique for handover in a cellular system of TDMA, but in asymmetric channels and high-speed data transmissions in which a rising line and a falling line have different transmission capacities. There is no mention of handover.

In addition, Japanese Patent Application Laid-Open No. 7-322332 discloses a technique for receiving another base station signal in a no-signal interval in a cellular system of FDMA, TDMA, or CDMA system, and handover accordingly. There is no mention of handover in asymmetric channels or high-speed data transmissions in which the rising and falling lines have different transmission capacities.

In addition, Japanese Patent Application Laid-Open No. 8-154269 measures the radio signal strength from a radio base station in a mobile communication system, adds a sequence of radio signal strengths in ascending order, and associates it with the handover ranking and handover accordingly. Although a candidate selection technique is disclosed, a communication system of an asymmetric channel in which a rising line and a falling line have different transmission capacities, and there is no mention of handover in high-speed data transmission.

In addition, Japanese Patent Application Laid-Open No. 8-280056 describes a cellular system of a TDMA method or a CDMA method in which a handover without instantaneous disconnection is provided by equipping a data buffer in a wireless base station and synchronizing between base stations with an adjacent base station. Although a technique for realizing the above is disclosed, there is no mention of handover in mobile communication or high-speed data transmission in which a rising line and a falling line have an asymmetric channel having different transmission capacity.

As described above, various mobile communication systems comprising one or more radio base stations communicating with various mobile stations via radio channels and using the TDMA system and the time division CDMA system have been known. In such a mobile communication system, the need for introducing high-speed data transmission is increasing, but a mobile communication system that can cope with it sufficiently has not yet been realized.

In addition, in order to enable the mobile communication system to cope with the multimedia, it was necessary to introduce communication channels having different communication capacities on the rising line and the falling line.

Also in such a mobile communication system, it is necessary to introduce a handover means for enabling a smooth handover in high-speed data transmission.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and introduces a set of high speed data channels to a TDMA signal and a time division CDMA signal coexistence mobile communication system, and a communication line having a different communication capacity between a rising line and a falling line. In a mobile communication system assigned as a communication channel, a mobile communication system capable of handover is realized.

The present invention is enhanced by using frequency channel sharing or time slot sharing using a multiple access method such as a time division multiple access (TDMA) scheme or a time division CDMA (code division multiple access) scheme. Handoverable mobile communication with a function that allows a pair of lines having different communication capacities of a line (uplink) and a downlink line (downlink) into one communication channel (hereinafter referred to as an asymmetric communication channel). It is about the system.

1 is a system configuration diagram showing an overall configuration diagram of a mobile communication system according to Embodiment 1 of the present invention;

2 is an explanatory diagram showing a personal communication system (hereinafter referred to as a PCS) and a cellular time slot configuration using time division CDMA according to the first embodiment;

3 is an explanatory diagram showing an example of nonuniformity of delay time in the first embodiment;

FIG. 4 is an explanatory diagram showing an example of an information transmission time difference that depends on a transmission path difference between adjacent radio base stations in handover in the first embodiment;

Fig. 5 is a block diagram showing the configuration of a mobile switching center having a function of assigning a serial number for each frame in the first embodiment;

6 is an explanatory diagram showing the correspondence between the structure of a public network packet and the structure of a radio channel in the first embodiment;

FIG. 7 is an explanatory diagram showing an example of an information transmission time difference that depends on a transmission path difference between adjacent radio base stations in handover according to Embodiment 2 of the present invention; FIG.

8 is a timing chart showing a handover process according to the second embodiment;

FIG. 9 is an explanatory diagram showing an example of a time slot structure in a frame of TDMA fast data communication according to the third embodiment of the present invention; FIG.

Fig. 10 is an explanatory diagram showing an example of a microslot structure at the time of handover of a fast TDMA data channel when the information of the switchover base station in the third embodiment is slower than the information of the switchover base station;

11 is an explanatory diagram showing an example of a microslot structure at the time of handover according to the fourth embodiment of the present invention;

12 is an explanatory diagram showing a structure of an ATM packet and radio channel information according to a fifth embodiment of the present invention;

13 is a block diagram showing the configuration of a mobile station according to Embodiment 6 of the present invention;

14 is a block diagram showing the configuration of a radio base station according to Embodiment 7 of the present invention;

Fig. 15 is a block diagram showing the internal structure of the signal processing unit in the seventh embodiment;

16 is a system configuration diagram showing an overall configuration diagram of a mobile communication system according to Embodiment 8 of the present invention.

[Initiation of invention]

A mobile communication system according to the present invention includes a mobile switching station having a TDMA signal and a time slot common / frequency channel common time division CDMA signal, and having a control function for allocating the signal on a time axis and a frequency axis. A mobile switching station in which their wireless base station is connected to the information of each time slot in a frame of each descending line transmitted wirelessly between two wireless base stations connected by a multi-connection method and transmitted from two adjacent radio base stations to one mobile station. Is to give the serial number. As a result, handover between radio base stations can be realized by a uniform process according to this serial number.

The mobile communication system according to the present invention has a function of detecting a serial number contained in information of each time slot in frames of two falling lines transmitted from two radio base stations.

The mobile communication system according to the present invention has a function of repeatedly setting a serial number contained in the information of each time slot in a frame of a signal transmitted to a radio base station for every multiframe number or an integer multiple of the radio channel. It is.

In the mobile communication system according to the present invention, a radio number in which the communication is reconnected by the movement of the mobile station and the serial number included in the information of each time slot in the frame of the signal transmitted from the radio base station (switching base station) with which the mobile station is communicating. Receive / detect / compare the serial numbers included in the information of the respective timeslots in the frame of the signal transmitted from the base station (transition base station) to generate a repetition code based on the difference information of these two serial numbers, In this way, the mobile station has a function of transmitting via the switching base station.

In the mobile communication system according to the present invention, if the signal transmitted from the switching base station is slower than the signal transmitted from the switching base station, the repetition code is an additional number, and the signal transmitted from the switching base station is transmitted from the switching base station. If it is earlier than the signal, the repetition code is an integer.

In the mobile communication system according to the present invention, the serial number included in the information of each time slot in the frame of the signal transmitted from the switching base station at the time of handover and the information of each time slot in the frame of the signal transmitted from the switching base station If the signal transmitted from the switching base station is slower than the signal transmitted from the switching source base station by receiving / detecting / compare the serial numbers included in the < RTI ID = 0.0 > The mobile station has a function of destroying the number according to the contents of the repetition code by the difference information of the two serial numbers. This makes it possible to easily adjust the information delay when the signal of the switching base station is slower than the signal of the switching base station in the mobile station, thereby easily avoiding the discontinuity of information generated during handover.

The mobile communication system according to the present invention transfers the function of realizing the numbering of the serial number included in the information of each time slot in the frame by the mobile switching center by adding a new header to the head of the ATM packet. It is given to the exchange.

The mobile communication system according to the present invention divides the information of the public network packet into the timeslot information bits of the radio channel when the information bits that can be transmitted by one time slot of the radio channel are less than the information bits of one public network packet transmitting the public network. A mobile station has a function of constructing a packet each having one piece of information and transmitting it to a radio base station.

In the mobile communication system according to the present invention, when the information bits that can be transmitted in one time slot of a wireless channel are larger than the information bits for one public network packet, the variable amount of packet information is transmitted to the wireless base station without being divided into the information of the public network packet. To the mobile switching center.

In the mobile communication system according to the present invention, the switch interface of the radio base station is in the form of ATM.

In the mobile communication system according to the present invention, in handover, the serial number included in the information of each timeslot in the frame of the signal transmitted from the switching base station and the timeslot in each frame of the signal transmitted from the switching base station are included. The mobile station has the function of receiving / detecting / compare the serial numbers contained in the information and generating a repetition code based on the difference information of the two serial numbers, and at the same time, the signal to be transmitted when the mobile base station If it is faster than the signal transmitted from the base station, the time slot information of the signal already transmitted to the mobile station according to the command of the repetition code at the time of handover is maintained according to the content of the repetition code, and the signal to the mobile station is transmitted simultaneously with the handover. The radio base station has a function of sequentially transmitting the information of the retained time slots first. As a result, when the signal of the switching base station is earlier than the signal from the switching base station, the switching base station retransmits the information of the last timeslot of the previous frame by the number indicated by the content of the repetition code, and thus causes the mobile station to transmit information. By making the delay of the information from each radio base station equal, it is possible to easily avoid the discontinuity of information generated at the time of handover.

A mobile communication system according to the present invention includes a mobile switching station having a TDMA signal and a time slot common / frequency channel common time division CDMA signal, and having a control function for allocating the signal on the time axis and the frequency axis, and the mobile station and the mobile switching station. The wireless base station connected to the wireless base station is wirelessly connected by a multiple access method, and a mobile station having a high-speed data transmission function can be wirelessly connected to the wireless base station even in a high-speed data channel and transmitted from two adjacent radio base stations to one mobile station. The serial number is assigned to the information of each microslot of the high-speed data transmission channel transmitted in each time slot in the frames of two falling lines by the mobile switching station to which their radio base station is connected. As a result, handover between radio base stations at the time of high-speed data transmission can also be realized by a unified process according to this serial number.

The mobile communication system according to the present invention detects a serial number included in the information of each microslot of the high speed data transmission channel transmitted from each time slot in two downlink frames transmitted from two radio base stations. The function is given to the mobile station.

In the mobile communication system according to the present invention, the serial number included in the information of each microslot of the fast data transmission channel transmitted among the time slots in the frame of the signal transmitted to the radio base station is determined by the number of multiframes of the radio channel or the like. The mobile switching station has a function to set repeatedly every integer multiple.

In the mobile communication system according to the present invention, a serial number included in the information of each microslot of the fast data transmission channel transmitted among the time slots in the frame of the signal transmitted from the switching base station is transmitted from the switching base station. Receive / detect / compare the serial numbers included in the information of each microslot of the fast data transmission channel being transmitted among the time slots in the frame of the signal, and generate a repetition code based on the difference information of those two serial numbers. The mobile station has a function of transmitting to the mobile switching center via the switching base station.

In the mobile communication system according to the present invention, at the time of handover, the serial number and the switching destination included in the information of each microslot of the fast data transmission channel transmitted among the respective time slots in the frame of the signal transmitted from the switching base station. Receive / detect / compare the serial number included in the information of each microslot of the high-speed data transmission channel transmitted among the time slots in the frame of the signal transmitted from the base station, and the signal transmitted from the switching base station is the switching source. If it is slower than the signal transmitted from the base station, the mobile station discards the information of the microslot of the newly received signal at the switchover base station by the number of repetition codes based on the difference information of the two serial numbers. Would have to. As a result, the information delay is adjusted in the mobile station when the signal of the switching base station is slower than the signal of the switching base station during high-speed data transmission, so that the discontinuity of information generated during handover of high-speed data transmission can be easily performed. Can be avoided.

In the mobile communication system according to the present invention, at the time of handover, the serial number and the switching destination which are included in the information of each microslot of the fast data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching base station. Receives, detects, and compares the serial numbers contained in the information of each microslot of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the base station, and repeats the difference information of the two serial numbers. If the mobile station has a function of generating a code and the signal transmitted in the case of the mobile base station is faster than the signal transmitted from the switching base station, the signal already transmitted to the mobile station in accordance with the command of the repetition code during handover The information on the microslot is kept as many as the contents of the repetition code, and handover and At the same time, the radio base station has a function of sequentially transmitting the signal to the mobile station with the microslot information held therein first. Thus, when the signal of the switching base station is faster than the signal from the switching base station at the time of high-speed data transmission, the switching base station retransmits the information of the last microslot of the previous frame by the number indicated by the content of the repetition code. By making the delay of the information from each radio base station in the mobile station the same, the discontinuity of information generated at the time of handover of the high speed data transmission can be easily avoided.

The mobile communication system according to the present invention has a function of transmitting a repetition code from a mobile station received via a switching base station to a switching base station simultaneously with the determination of handover.

A mobile communication system according to the present invention includes a mobile switching station having a TDMA signal and a time slot common / frequency channel common time division CDMA signal, and having a control function for allocating the signal on a time axis and a frequency axis. In the case of wireless connection between the wireless base stations connected to each other by the multiple access method, and for transmitting the information contained in the timeslot received from the mobile station to the mobile switching station, the serial number associated with the multiframe of the radio channel is assigned to the information from the mobile station. The radio base station has an additional function. This makes it possible for the mobile switching station to identify the order of the information transmitted by the mobile station, thereby avoiding an incorrect order of the information transmitted from the mobile switching station to the public network at the time of handover.

The mobile communication system according to the present invention has a function of detecting a serial number associated with a multiframe of a radio channel included in information of a timeslot transmitted from a radio base station.

The mobile communication system according to the present invention provides a radio base station with a function of repeatedly setting a serial number associated with a multiframe of a radio channel included in information of a timeslot transmitted to a mobile switching station every multiframe number or an integer multiple of the radio channel. I had it.

The mobile communication system according to the present invention provides a radio base station with a function of adding a serial number associated with a multiframe of a radio channel included in information of a timeslot transmitted to a mobile switching center as a header to the head of an information packet for transmitting to a mobile switching station. I had it.

The mobile communication system according to the present invention checks the serial numbers included in the headers of the information packets transmitted from two radio base stations at the time of handover, and sequentially arranges the information packets on the public network so that the serial numbers are correctly aligned in order. The mobile switching center has a function to transmit the data.

The mobile communication system according to the present invention comprises a storage means for accumulating information contained in a time slot received at a radio base station or information of a microslot in a time slot, and a specified number according to the content of a repetition code during handover. As a result, a control means for destroying the information stored in the storage means is provided. As a result, in the case of handover, it is only necessary to set the storage means and the control means for controlling the same by the contents of the repetition code, so that the signal of the switching base station is slower than the signal of the switching base station. Handover control can be easily performed in the mobile station.

The mobile communication system according to the present invention has a number of hands specified by the contents of the repetition code and the storage means for accumulating the information included in the time slot transmitted immediately before handover to the radio base station used therein or the information of the microslot in the time slot. A control means is provided for storing information transmitted immediately before over in the storage means and for retransmitting the information stored in the storage means at the time of handover. This makes it possible to avoid receiving the mobile station without continuous information at the time of handover even when the information of the switching base station is earlier than the information of the switching base station.

A mobile communication system according to the present invention includes a mobile switching station having a TDMA signal and a time slot common / frequency channel common time division CDMA signal, and having a control function for allocating the signal on a time axis and a frequency axis. The wireless base stations connected to the wireless base stations are connected wirelessly by means of a multiple connection method, and the respective mobile switching stations are directly connected by means of additional communication lines, not through public networks. In this way, the handover can be made independent of the public network by setting up additional communication lines directly connecting the mobile switching centers and headers passing through the mobile switching centers.

In the mobile communication system according to the present invention, when handover is performed between a switching base station and a switching base station connected to different mobile switching stations, the information from the switching base station communicating with the mobile station after the handover is changed. The base station is connected to the public network through the additional communication line and the mobile switching station to which the switching source base station is connected.

In the mobile communication system according to the present invention, communication of information from the switching base station, which is transmitted to the public network via the additional communication line and the switching base station to which the switching source base station is connected, is terminated at the mobile switching station to which the switching base station is connected. Then, when the communication is resumed, information from the mobile station is transmitted from the switching base station directly to the public network via the mobile switching station to which the switching base station is connected.

The mobile communication system according to the present invention is such that several mobile switching centers connected by additional communication lines belong to different operators (operators). In this way, handover between radio base stations connected to mobile switching stations belonging to different operators can be handled similarly to handover between radio base stations belonging to the same operator.

In the mobile communication system according to the present invention, a plurality of connected mobile switching centers in an additional communication line are in the form of ATM.

In the mobile communication system according to the present invention, an additional communication line connecting between several mobile switching stations is in the form of ATM.

In the mobile communication system according to the present invention, after handovering a plurality of radio base stations belonging to several mobile switching stations, the switch base station accesses information from the switch base station currently communicating with the mobile station when the mobile station is still busy. The mobile switching center transmits to the public network from the mobile switching center to which the switching source base station is connected via the multiple mobile switching stations and the additional communication lines connecting them.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, in order to demonstrate this invention further in detail, the best form for implementing this invention is demonstrated according to attached drawing.

<Example 1>

1 is a system configuration diagram showing an overall configuration diagram of a mobile communication system to which a timeslot common / frequency channel common system according to the present invention is applied, which is referred to as a radio base station (hereinafter referred to as a switching base station) to which a mobile station hands over. An example of the case where the information from the subcarrier is slower than the information from the radio base station (hereinafter referred to as a switching base station) to which the mobile station initially communicates is described.

In the figure, (1) is a public network (PSTN), (2) is a database housed in this public network (1), (3), (4) and (5) are exchangers belonging to this public network (1). (6), (7) and (8) are mobile switching centers (MSCs) with TDMA signals and timeslot common / frequency channel common (including non-frequency common) time division CDMA signals and their signals on the time base and frequency A control function is assigned to the shaft, and the mobile switching station 6 is connected to the exchanger 3 of the public network 1, the mobile switching station 7 to the exchanger 4, and the mobile switching station 8 to the exchanger 5. Each has a wired connection.

(11), (13), (21) and (31) are radio base stations (BS), where radio base stations 11 and 13 are connected to the mobile switching center 6, and the wireless base station 21 is connected to the mobile switching station. (7), the radio base station 31 is connected to the mobile switching center 8, and is controlled by each mobile switching center (MSC). (12), (14), (22) and (32) are radio-areas (hereinafter, referred to as cells) constituted by the radio base stations 11, 13, 21, or 31. Cell 12 is the radio base station 11, the cell 14 is the radio base station 13, the cell 22 is the radio base station 21, the cell 32 is the radio base station ( 31), respectively.

(15), (16), (17), (18), (24) and (33) are radio base stations constituting cells 12, (14), (22) and (32) respectively, The conventional type of mobile communication device or data communication mainly for voice communication such as a mobile vehicle-mounted communication device or a mobile portable communication device that communicates with a wireless channel with (11), (13), (21) and (31). This is a normal mobile station (MS) by a multimedia mobile communication device or the like. Reference numeral 23 denotes a semi-fixed WLL station WS that communicates with the radio base station 21 via a radio channel. These conventional mobile stations (MS) and WLL stations (WS) communicate with the radio base station (BS) via the medium / fast TDMA channel, and in addition to the dual / fast TDMA channel, the voice or It has the function to execute low speed data communication. Hereinafter, these ordinary mobile stations MS and WLL stations WS will be collectively referred to as mobile stations.

Here, between the mobile stations 15 to 33 and the WLL stations 23 and the like and the radio base stations 11 to 31 receive signals on a communication channel modulated by a digital modulation method, and receive FDMA / By TDD (TDD; Time Division Duplex) or CDMA / TDD, multicarrier TDMA / FDD (FDD: Frequency Division Duplex), TDMA / TDD, Time Division CDMA / FDD Wireless connection by the method, the time division CDMA / TDD method, or the like.

Fig. 2 is an explanatory diagram showing the configuration of PCS and cellular time slots using time division CDMA according to the first embodiment, in which a mobile communication system having asymmetrical transmission capacity of a rising line and a falling line, such as high-speed TDMA data transmission, is lowered. It shows an example of a line T ₇ the expansion.

In the figure, # 41-T0 / R0 to # 41-T2 / R2 and # 41-T3 are timeslots for PCS, and # 47-T1 / R1 and # 47-T2 / R2 are cellular timeslots. # 44-T0 / R0 is a time slot for TDMA medium-speed data communication, and # 51-T0 / R0 to # 51-T2 / R2, # 51-T3 and # 51-T7A are time slots for TDMA high-speed data communication. Also, # 52-T7C represents a time slot for time division CDMA high speed data communication. Also, # 42-T0 / R0 to # 42-T2 / R2 and # 42-T3, # 43-T1 / R1 and # 43-T2 / R, # 43-T1 and # 43- with other "*" The low-speed TDMA timeslots of T2, # 45-T0 / R0, # 45-R1 to # 45-R2, and # 45-T3 show examples of use as voice data, low-speed data, or control channels.

In the example shown in FIG. 2, five timeslots of T _{0 to} T ₃ and T ₇ are assigned to the descending lines from the radio base stations 11 to 31 to the mobile stations 15 to 33, and R Three timeslots of _{0 to} R2 are allocated to the ascending lines from the mobile stations 15 to 33 to the radio base stations 11 to 31. In this way, the asymmetric TDD method has different communication capacities in the rising line and the falling line.

In Fig. 2, reference numeral 53 denotes one frame length, and 54 and 55 denote 1/2 frame lengths. Reference numeral 56 denotes a falling time slot length from the radio base stations 11 to 31 of the high speed data communication to the mobile stations 15 to 33, and the reference numeral 57 denotes the mobile stations 15 to 33 of the high speed data communication. Is the length of the rising timeslot from the radio base stations 11 to 31. (58) and (59) are descending lines from the radio base stations 11 to 31 to the mobile stations 15 to 33 and from the mobile stations 15 to 33 to the radio base stations 11 to 31. It is a line in the time time-frequency axis which becomes the boundary of a rising line.

Fig. 3 shows an example of the nonuniformity of the delay time according to one example of the arrangement of the fixed line from the database 2 to the radio base stations 11 to 31 and the switching stations 3 to 5 of the public network 1. As an illustrative view, the delay time until the same signal transmitted from one database 2 reaches the radio base station BS by way of another path is shown. That is, as shown in Fig. 3, the signal 63 has a difference in the arrival time of the signal because the number of times via the switch SC in the public network 1 is less than once than the other signals 61 and 62. Is considered. Therefore, even in a communication method in which frame synchronization is performed between the radio base stations BS, when the mobile station hands over between the radio base stations BS, what is the deviation of the signal delivery time between the radio base stations BS? Need to check the function.

The function will be described below.

Also, in a mobile communication system using such a TDMA / time division CDMA scheme, Japanese Patent Application Laid-Open No. 9-191090 describes a system for measuring the synchronization time shift of frame synchronization between base stations in time division CDMA chip rate units. Filed separately. In this separately filed system, the time division CDMA burst signal transmitted by the mobile station according to the instruction of the radio base station so that its head arrives at the head time position of the time division CDMA burst signal received from the radio base station and the head time position of the time slot. The synchronous time shift is measured by calculating the time difference excluding the fixed time difference between the start time positions in the chip rate units used for time division CDMA communication.

4 is an explanatory diagram showing an example of an information transmission time difference that depends on a transmission path difference between adjacent radio base stations in handover. In the figure, reference numeral 71 denotes a corresponding frame of the radio wave of the switching base station, 72 denotes a corresponding frame of radio wave of the switching base station, and each frame corresponds to (81), (82), (83), ( 84),... … … The serial number of is given by the mobile switching center. Reference numeral 73 denotes a corresponding frame of the received radio wave of the mobile station during handover, and 74 denotes a serial number of the corresponding frame 71 of the radio wave of this switching base station and a corresponding frame of the radio wave of the switching base station. It is a repetition code assignment period for giving a repetition code which is the number difference information of the serial number of (72).

Fig. 5 is a block diagram showing the configuration of a mobile switching center having a function of assigning the serial number to each frame. In the figure, reference numeral 6 denotes a mobile switching center MSC1 denoted by the same reference numerals in FIG. 1, and reference numerals 11 and 13 denote radio base stations BS11 and BS13, 1 connected to the mobile switching center 6; Is the public network (PSTN) in which the mobile switching center 6 is housed, and (2) is the database connected to this public network (1).

In the mobile switching center 6, reference numeral 91 denotes a PSTN interface that transmits and receives information to and from the public network 1, and also transmits and receives signaling signals such as dial signals, billing information, and encryption information. Information transmitted from the public network 1 to the radio base stations 11 and 13 constituting a cell in which the other station re-authorizes the information and transmitted from the mobile station via the radio base stations 11 and 13 to the mobile station. The exchange is a call that is sent to the public network (1). Numeral 93 is a method setting processor for selecting a radio system for connecting the radio base stations 11, 13 and the mobile station and instructing the radio base stations 11, 13 and the mobile station to set it, and 94 a connection. It is a signaling processor that processes the number of the mobile station to be or the cancer procedure for charging. Numeral 95 indicates information transmitted to the mobile station via the radio base stations 11 and 13, signaling information between the mobile station, and scheme information for defining a wireless connection, and the like. A base station interface for communicating.

Reference numeral 96 is a data number management processor for assigning serial numbers in frame units or packet units to radio wave information transmitted from two radio base stations 11 and 13 at the same time as the handover process starts. The numbering function by the number management processor 96 is a new function of this mobile switching center in consideration of handover. Reference numeral 97 denotes a memory device for high-speed data that temporarily stores high-speed data transmitted and received between the mobile station and the database 2 when the mobile station connects with the database 2. (98) stays in the cell of the mobile station managed by this mobile switching station 6, i.e., belonging to this mobile switching station 6 or currently managed by this mobile switching station 6, and connected to their wireless base station. It is a mobile station information memory in which mobile station information of a registered mobile station is registered.

In addition, in FIG. 4, the length of one frame is 10ms, and the mobile station 16 shown in FIG. 1 handovers from the switching base station 11 to the switching base station 13. The switching base station 13 The frame 72 containing information that the mobile station 16 wants to communicate during the radio waves transmitted by the frame is a frame that contains information that the mobile station 16 wants to communicate during the radio waves transmitted by the source eNB 11. 71) shows a case of delaying in time, and as an example, a case in which two radio wave frames have a difference of two frames in time. Incidentally, such a large time delay is not considered to occur between the two radio base stations 11 and 13 connected to one mobile switching station 6, but as an example for simplicity of explanation. I am holding such a case.

The mobile switching center 6 uses the data number management processor 96 shown in FIG. 5 to transmit the serial number as shown in FIG. 4 in frame units in the information of radio waves transmitted from the radio base stations 11 and 13. The number is assigned at the same time as the start of the handover process. The serial number included in the information of the signal transmitted from the mobile switching station 6 to the radio base stations 11 and 13 is repeatedly set, for example, for each number of multi-frames of the radio channel or an integer multiple thereof. The mobile station 16 receives the radio waves 71 and 72 from these two radio base stations 11 and 13, and decodes the serial number assigned to each frame included in the information of the timeslot. Then, the time difference of arrival of two pieces of information is detected.

The mobile station 16, having received two radio waves from the radio base station 11 and the radio base station 13, switches to the new radio wave 72 at the same time as the handover command. The change of the number for each frame of the serial number included in the information of the signal received by the mobile station 16 before and after the change is shown in the corresponding frame 73 of the received radio wave of the mobile station in the handover of FIG. In this case, since the serial numbers 84 and 85 are each received twice, it is necessary to discard the signals of 84B and 85B received twice.

That is, for a double received information frame to be discarded, a command called a repeating code is output in the repeating code granting period 74, and the discarding is executed. This repetition code is information of a serial number of a serial number included in the time slot information of two radio waves received by the mobile station 16 from the switch base station 11 and the switch base station 13. Here, when the signal transmitted by the switchover base station 13 is slower than the signal transmitted by the switchover base station 11 in this manner, this repetition code becomes a positive number. The mobile station 16 transmits this repetitive code to the mobile switching center 6 via the switching source base station 11 in communication.

Here, in the case of handover as shown in Fig. 4, when the signal of the switching base station 11 is delayed from the signal of the switching base station 13, the discarding of the received signal by this repetition code is terminated by the mobile station. Information carried out in (16) and said discarding is carried out is communicated to the mobile switching center 6 via the new switchover base station 13. The mobile switching station M6, which has been informed, switches the path from the radio base station 11 to 13, and transmission / reception of the communication channel used by the radio base station 11 is stopped so that the communication channel of the radio base station 13 is stopped. It is used for communication with the mobile station 16. As a result, the handover process in this case ends.

When the MSC in the first embodiment uses an Asynchronous Transfer Mode (hereinafter referred to as ATM) type exchanger and the exchange interface of the radio base station BS is ATM type. In order to assign a serial number to the above-mentioned data, a sequence header may be added, and the above object can be achieved by setting the ATM demultiplexer in the radio base station to decrypt the header.

In that case, if the number of bits per packet of the packet (public network packet) of the ATM system transmitting the public network (PSTN) is larger than the number of bits included in one frame of the mobile communication system of the wireless section, the wireless base station divides the bits of the public network packet. It is assumed that the radio frame is transmitted together. For example, when the number of bits of one public network packet is 384 bits and the number of bits per frame of the radio section is 128 bits, the number of packet bits is divided into three and allocated to the radio section frame bits. At that time, the numbering of the divided bits is assumed to have a function that the radio base station is in charge of.

6 shows the correspondence between the structure of the public network packet and the structure of the radio channel. In the figure, reference numeral 101 denotes a number header of a public network packet, 102 denotes an ATM packet information, 103a denotes a first information portion of three-part divided ATM packet information, and 103b denotes three-part divided ATM packet information. The second information part of 103c is the third information part of the divided ATM packet information. The number header 101 of the public network packet is a number added by the mobile switching center 6 in the form of ATM.

Numeral 104 denotes a radio control channel of a first frame of a radio channel, 105 denotes a radio transmission information of the second frame, 106 denotes a radio control channel of a second frame, and 107 a radio transmission information of the second frame. Is a radio control channel of the third frame, and 109 is radio transmission information thereof.

The radio control channel 104 includes a control information portion and a number portion of a radio section, which indicates the first number of numbers added by the mobile switching center 6 in the form of ATM. The wireless transmission information 105 is a portion in which the first information portion 103a obtained by dividing the ATM packet information into three portions is stored. The radio control channel 104 and radio transmission information 105 constitute radio information of the first frame. Similarly, the radio information of the second frame is stored in the radio control channel 106 including the second number of numbers added by the mobile switching station 6 in the ATM form, and the radio in which the second information portion 103b divided into three parts is stored. The third frame is composed of transmission information 107, wherein the radio information of the third frame is divided into three pieces of radio control channel 108 comprising a third number of numbers added by the mobile switching center 6 in the form of ATM. The portion 103c is constituted by the stored wireless transmission information 109.

On the contrary, when the number of bits included in one frame of the radio section is larger than the number of bits in one packet of the public network packet (as is the case for high-speed data transmission), the ATM packet information of the public network packet is transmitted to the radio base station without being divided. The mobile switching station is provided with a variable function of packet information quantity, and in such a case, the radio base station transmits radio waves with the number added to each packet in one frame. In the case of such high-speed data transfer, the third embodiment will be described in detail later.

As described above, according to the first embodiment, when the signal of the switching base station is slower than the signal of the switching base station, the information delay is adjusted in the mobile station by discarding the number of signals indicated by the contents of the repetition code. As a result, the handover operation can be easily performed.

<Example 2>

Next, as a second embodiment of the present invention, a process in the case where the signal from the switching base station arrives at the mobile station in time earlier than the signal from the switching base station will be described.

FIG. 7 is an explanatory diagram showing an example of an information transmission time difference that depends on the transmission path difference between adjacent radio base stations in the handover in the second embodiment. In the figure, reference numeral 111 denotes a corresponding frame of the radio wave of the switching source base station, 112 denotes a corresponding frame of radio wave of the switching base station, and for each frame, 81, 82, 83, ( 84),... … … The serial number of is given by the mobile switching center. Reference numeral 113 denotes a corresponding frame of the received radio wave of the mobile switching center during handover, and 114 denotes a repetition code assignment period for giving a repetition code. Also in this case, the length of one frame is shown as 10 ms.

As shown in FIG. 7, the serial number for each frame indicated by the information of the corresponding frame 112 of the radio wave of the switching base station 13 indicates the corresponding frame 111 of the radio wave from the source eNB 11. When received by the mobile station 16 earlier than the serial number for each frame of information, the mobile station 16 has a number of times per frame of information of the corresponding frame 112 of radio waves from the switching base station 13. Measure the fast. The "several times fast" information of the measurement result is communicated to the mobile switching center 6 via the switching base station 11. In the example shown in FIG. 7, the mobile switching center 6 communicates the repetition code whose contents are set to "1" so as to inform the switchover base station 13 of this "first fast" information. . When the information transmitted by the switchover base station 13 is earlier than the information of the switchover base station 11 in this manner, the repetition code becomes an integer.

(84B), (85B), and (86B) of the serial numbers for each frame of the corresponding frame 112 of the radio wave from the switching base station 13 are information delayed by one frame by the content "1" of the repetition code. Indicates that it is being fired from the switching base station 13 after the handover time. Therefore, the mobile station 16 receives the corresponding frame 111 of the radio wave from the switching source base station 11 until the handover time point, and after the handover time the corresponding frame of the radio wave from the switch base station 13 ( 112). Therefore, the switchover base station 13 has a function of delaying the information of the integral number of the frame time by the number indicated by the repetition code by using the built-in memory.

When the radio wave emitted by the switching base station 13 is delayed by the number indicated by the repetition code, the serial number indicated by the switching base station 13 and the serial number indicated by the switching source base station 11 coincide with each other. The mobile station 16 confirms and transmits the confirmation information to the mobile switching center 6 via the new switchover base station 13.

Fig. 8 is a timing chart showing the handover process in the second embodiment. Process P121 in the figure shows that the radio station is in communication with the mobile station 16 and the switchover base station 11, and the process P122 shows the wired connection communication between the radio base station 11 and the mobile switching station 6. FIG. In addition, in the processes P123 and P124, a handover request due to an increase in the error rate or the like is transmitted from the mobile station 16 to the mobile switching station 6 through the switching source base station 11 or via the switching source base station 11 in communication.

Upon receipt of this handover request, the mobile switching center 6 transmits a time slot or spread of the switching destination to the switching base station 13 in process P125 and to the mobile station 16 via the switching base station 11 in process P126, respectively. Wireless information such as code is transmitted. At this point, the switchover base station 13 starts transmitting the same signal as the falling line of the switchover base station 11 via the switchover channel in process P127. The mobile switching center 6 also assigns serial numbers in units of frame lengths to signals transmitted to two radio base stations 11 and 13 at the same time.

The mobile station 16 receives the serial number from each of the two radio base stations 11 and 13 and measures the misalignment of the serial numbers transmitted by the two radio base stations 11 and 13 in the process P128. The shift information is transmitted to the mobile switching station 6 via the radio base station in communication (in this case, the switching base station 11). The number of shifts communicated in this process P 128 is repeated in the process P129. The switching center base station 13 is notified from the mobile switching station 6. The switching base station 13 starts transmission of the signals delayed by the number to the mobile station 16 in the process P130. In steps P131 and P132, it is confirmed that the serial numbers of the information included in the frames of radio waves from the two radio base stations 11 and 13 match, and the confirmation information is converted into the switching base station 11. Via a mobile switching center ( 6) to transmit.

The mobile switching center 6 transmits a "communication start command" to the switchover base station 13 in process P133, and the switchover base station 13 transmits the information to the mobile station 16 in process P114. Next, in step P135, the radio communication between the mobile station 16 and the switching base station 13 is started, and in step P136, the wired communication between the switching base station 13 and the mobile switching station 6 is started. After that, in step P137, the "wireless cutting command" is transmitted from the mobile switching center 6 to the switch base station 11, and in step P138, the radio communication between the switch base station 11 and the mobile station 16 is cut off. .

As described above, according to the second embodiment, when the signal of the switching base station is earlier than the signal from the switching base station, the transmission of the switching base station is delayed, so that the delay of the signals from the two radio base stations in the mobile station is increased. The same has the effect that the handover operation of the mobile station can be easily performed.

<Example 3>

Next, as a third embodiment of the present invention, handover during high speed data transmission will be described.

The above-mentioned Japanese Patent Application No. Hei 9-164817, which is separately filed, defines a mobile communication system capable of high-speed data transmission. There are provisions for symmetrical communication channels in which both up / down communications are high-speed data transmissions, and in cases where only one of the up / down communications is high-speed data transmission and the other is asymmetrical communication channel, which is low-speed data transmission. Doing. Here, a mobile communication system that enables handover in the case of high-speed data transmission that also includes this asymmetric communication channel is shown.

In addition, high-speed data transmission can be realized by the TDMA method or the time division CDMA method, and high-speed data by the TDMA method in time slots # 51-T0 / R0, T1 / R1, T2 / R2, T3, and T7A shown in FIG. A communication channel is shown and a fast data communication channel by time division CDMA is shown in timeslot # 52-T7C. In the case of the fast data communication channel using the time division CDMA scheme, since the data structure demodulated by the CDMA spreading code or the data structure before the frequency spreading by the CDMA spreading code is considered to be the same as the data structure of the fast data communication channel according to the TDMA scheme, In the following description, only the example of the high speed data communication channel by the TDMA method will be described in detail.

FIG. 9 is an explanatory diagram showing an example of a time slot structure in a frame of TDMA high-speed data communication according to the third embodiment of the present invention. FIG. In the figure, reference numerals 141 and 143 denote time slots corresponding to the time slots # 51-T2 for TDMA high-speed data communication shown in FIG. 2, and reference numeral 142 denotes time division CDMA time slots # 41-R2 for low-speed communication. Is a timeslot. The timeslot 141 is composed of 16 microslots 144-1 to 144-16 with one time slot length of 625 ms, and one of them (microslot 144-16 in the drawing) is 39.06 ms. It forms guard time. Reference numeral 145 denotes a microslot format showing an example of the internal structure of each of the microslots 144-1 to 144-15. In the illustrated example, 40 bits of packet headers of 384 bits of information data and 80 bits of control data are stored in the ATM. It is also assumed that the packet may be in accordance with the structure of a packet of a form, and may be a terminal in which an MSC is an ATM and a radio base station is an ATM.

In the example of Fig. 9, only microslot 144-16 is guard time, but if necessary, such as a cellular communication system, microslot 144-15, or more microslots 144-14, 144-13,... … … Can also be guard time.

In addition, since the high speed data communication is the center of discussion, the time slot 142 for the low speed data communication is not mentioned. The time slot 141 for high speed data transmission is shown only for the falling line, but the same applies to the rising line.

FIG. 10 is an explanatory diagram showing an example of a microslot structure at the time of handover of a fast TDMA data channel configured according to a packet when the signal of the switching base station is slower than the signal of the switching base station. In addition, Fig. 10 shows TDMA high-speed bursts 146-1 and 146-2 of a falling line transmitted by a switching base station (e.g., the radio base station 11 of Fig. 1) that is wirelessly connected to the mobile station when the handover is initiated. And TDMA high-speed bursts 147-1 and 147-2 of the falling line transmitted by the base station (for example, the radio base station 13 in FIG. 1) of the handover point are shown.

When a handover is necessary in such a mobile communication system, the distance between the mobile station and several adjacent radio base stations is measured according to the deviation of the synchronization time of frame synchronization between base stations, and the handover judgment is executed according to the measurement result. do. For example, the measurement of the synchronization time shift of the frame synchronization between the base stations is performed so that the head of the radio base station arrives at the head time position of the time division CDMA burst signal received from the radio base station and the head time position of the time slot. The time difference excluding the time difference excluding the fixed time difference between the head time position of the time-division CDMA burst signal transmitted according to the instruction is calculated in the chip rate unit used for time-division CDMA communication. Run judgment. Since the handover determination function is disclosed in Japanese Patent Application No. Hei 9-191090 filed separately, its detailed description is omitted.

A time slot of information of the burst 146-1 transmitted by the switching base station 11 is composed of 16 micro slots, and the first micro slot number is # 151. On the other hand, the time slot of information of the burst 147-1 transmitted by the switching base station 13 is also composed of 16 microslots, and the first microslot number is # 149. Thus, FIG. 10 shows a case where the information number of the switchover base station 13 is two times slower than the information number of the switchover base station 11. This case is an example of an ATM packet transmitted from the mobile switching station 6 to the two radio base stations 11 and 13 in FIG. It is shown. In fact, it is not the case that such two microslots are delayed in one of these cases, but the above-mentioned case is assumed because the purpose is to define a countermeasure when a delay occurs.

The mobile station (for example, the mobile station 16 of FIG. 1) to initiate the handover is performed by the burst 146-1 transmitted by the switching base station 11 and the burst 147-1 transmitted by the switching base station 13. Receive sequentially within the same frame. The mobile station 16 recognizes that the microslot numbers at the head of each burst are # 151 and # 149, and indicates that the delay amount of the information is 2 microslots. A repetition code whose content is '2' is generated and transmitted to the mobile switching center 6 via the switch base station 11.

Receiving this repetition code, the mobile switching center 6 recognizes that the information number of the switchover base station 13 is two times slower than the information number of the switchover base station 11 in the content, and the content is '2'. Destroy the information of the first two microslots of the burst 147-2 transmitted by the switching base station 13 which transmits the code to the mobile station 16 via the switching base station 13 and receives after switching by handover. Instruct them to. The mobile station 16 having received this repetition code discards the information of the two microslots from the head of the burst 147-2 transmitted by the switching base station 13 because the content thereof is '2'. The microslot number of the information received by the mobile station 16 is a microslot number of # 164B to # 178 among the 16 microslots shown at the bottom of FIG. 10, but the microslot numbers are # 164B and # 178. The first two microslots, 165B, are discarded so that the remaining microslot numbers # 166 to # 178 are used within mobile station 16 as valid information.

As described above, according to the third embodiment, when the signal transmitted by the handover destination (switching base station) is slower than the signal transmitted by the handover source (switching source base station) during the high-speed data transmission, the mobile station determines that the repetitive code By discarding the number of microslots indicated by the contents, there is an effect that the discontinuity of information generated at the time of handover of fast data transmission can be avoided.

<Example 4>

Next, as a fourth embodiment of the present invention, a process in the case where the signal from the switching base station arrives at the mobile station in time earlier than the signal from the switching base station will be described.

FIG. 11 is an explanatory diagram showing an example of the microslot structure at the time of handover in Example 4 of the present invention. 11 shows the downlink fast TDMA bursts 146-1 and 146-2 transmitted by the switching source base station 11 wirelessly connected to the mobile station when the handover is started, and the switching base station 13 of the handover destination. TDMA fast bursts 147-1 and 147-2 of the falling line to be transmitted are shown.

The first microslot number of the 16 microslots constituting the time slot of the information of the burst 146-1 transmitted by the switch base station 11 is # 151, and the burst 147-1 of the burst base station 13 transmits. The first microslot number of the 16 microslots constituting the timeslot of information is # 154. Thus, FIG. 11 shows a case where the information number of the switching source base station 11 is three times slower than the information number of the switching base station 13. This case is an example of an ATM packet transmitted from the mobile switching station 6 to the two radio base stations 11 and 13 in FIG. It is shown.

The mobile station 16 to initiate the handover sequentially receives the burst 146-1 transmitted by the switch base station 11 and the burst 147-1 transmitted by the switch base station 13 in the same frame. The mobile station 16 recognizes that the microslot numbers at the head of each burst are # 151 and # 154, and indicates that the delay amount of the information is 3 microslots. A repetition code whose content is '3' is generated and transmitted to the mobile switching center 6 via the switching base station 11.

Receiving this repetition code, the mobile switching center 6 recognizes that the information number of the switchover base station 13 is three times earlier than the information number of the switchover base station 11 in the content, and the content is '3'. The code is transmitted to the switching base station 13, and the information of the last three microslots of the previous frame is repeatedly transmitted as the information of the three microslots at the head of the burst 147-2 transmitted by the switching base station 13. Instruct them to. Since the switching base station 13 having received the repetition code has a content of '3', the last three microslots of the information of the previously transmitted microslots are stored in the built-in memory, and the memory is stored in the memory at the same time as the handover. The microslot information of the burst 147-2 is sequentially transmitted, starting with the microslot information stored for the three microslots stored.

On the other hand, the mobile station 16, having received this repetition code via the switch base station 13, does not perform special processing on the information of the microslot of burst 147-2 transmitted by the switch base station 13 according to the instruction. Receive. The microslot number of the information received by the mobile station 16 is a microslot number of # 166 to # 180 among the 16 microslots shown at the bottom of FIG. 11, and the microslot number is # 166 to # 180. The first three microslots up to 168 are the information transmitted from the switch base station 13 in the previous frame again, but the mobile station 16 receives the microslots with the received microslot numbers # 166 to # 180. All are used as valid information.

As described above, according to the fourth embodiment, when the signal transmitted by the handover destination (switching base station) is faster than the signal transmitted by the handover source (switching source base station) during high-speed data transmission, the switching base station is repeated. By retransmitting the last microslot of the previous frame by the number indicated by the contents of the code, it is possible to avoid the discontinuity of information generated during the handover of the high speed data transmission.

Example 5

In each of the above embodiments, the descending line transmitting radio waves from the radio base station to the handover mobile station is described. However, in the fifth embodiment of the present invention, when the handover of the rising line transmitting radio waves from the mobile station to the radio base station is performed. The operation of the system will be described.

An important feature in the description of the process during handover of an uplink in this mobile communication system is a synchronization system in which synchronization of radio signal frames transmitted by several radio base stations is established. It is disclosed in detail in Japanese Patent Application No. Hei 9-191090 filed separately. As described above, the mobile communication system disclosed in Japanese Patent Application No. Hei 9-191090 has a head time position of a time-division CDMA burst signal received by the mobile station at the radio base station and a head time position of the time slot in accordance with the instruction of the radio base station. It is to establish frame synchronization between radio base stations by measuring the distance between the mobile station and several adjacent radio base stations in the time difference except the fixed time difference between the head time position of the time division CDMA burst signal transmitted to the radio base station so that its head arrives. .

In this Japanese Patent Application No. Hei 9-191090, although no high-speed data communication is mentioned, the frame of the TDMA system or the time division CDMA system is the same, and the high speed data communication of the TDMA system or the time division CDMA system is used. If the frame is the same as the above frame, the same inter-base station synchronization method as that of Japanese Patent Application No. Hei 9-191090 can be applied to a system including high-speed data communication. Further, if the symbol rate of the high speed TDMA data communication is equal to the chip rate of the low speed or high speed data communication channel by time division CDMA, or is a power of 2 or a power of 2, the synchronization of frames for synchronization establishment Can be identified with the same fast data communication and time division CDMA.

According to the system features described above, the handover operation of the rising line of the mobile communication system in the fifth embodiment will be described.

Here, when the mobile base station 16 moves in the direction of the radio base station 13 while the radio base station 11 and the mobile station 16 shown in FIG. 1 are connected wirelessly, a need for handover occurs. Consider.

Since two radio base stations 11 and 13 are simultaneously receiving radio waves of the rising line from the mobile station 16, and the two radio base stations 11 and 13 are frame-synchronized, two of the received signals are received. The time difference of arrival in the two radio base stations 11 and 13 is considered as an error within the guard time. Therefore, the problem of circuit switching during handover of an uplink line is not a problem of radio wave arrival between the mobile station 13 and the radio base stations 11 and 13, but moves with the two radio base stations 11 and 13. In the asynchronous transmission mode between the switching stations 6, the mobile station 6 receives which one first, or because the information of the previous frame has been delayed, the order of the packets transmitted from the switching center 6 to the public network 1 is different. It can be seen that it is the opposite. In this fifth embodiment, such a problem is solved as follows.

12 is an explanatory diagram showing the structure of ATM packets and radio channel information transmitted from the radio base station to the mobile switching center. In the figure, reference numeral 191 denotes time slot information of an uplink line transmitted by the mobile station 16 shown in FIG. 1 to the radio base station 11 or 13, and 192 denotes control data thereof, and This is the information data transmitted. Reference numeral 194 denotes a packet format modified from this time slot information 191, 195 denotes a header of the packet format 194 added to an ATM-type wireless base station, and 196 denotes information data to be transmitted. Reference numeral 197 denotes a packet signal transmitted from the mobile switching center to the database, 198 denotes a header added in the ATM of the ATM type, and 199 denotes an ATM packet information transmitted.

The control data 192 of the timeslot information 191 transmits control information necessary for line connection between the mobile station 16 and the radio base station 11 or 13, and the information data 193 is the mobile station 16. ) Is used to transmit information to the database (2) via the radio base station (11) or (13), the mobile switching center (6), and the public network (1). This time slot information 191 is transformed into a packet format 194 transmitted from the radio base station 11 or 13 to the mobile switching center 6. The modification from the timeslot information 191 to the packet format 194 adds information for notifying the mobile switching center 6 by removing the radio-specific information from the control data 192 of the timeslot information 191. .

In order to confirm the order of the information, the radio base station 11 or 13 receives the header 195 of the packet format 194 transmitted from the radio base stations 11 and 13 to the mobile switching center 6. The multiframe number on one radio channel is added as a serial number associated with the multiframe of the radio channel. The serial number associated with the multiframe of this radio channel may be set to repeat every integer multiple of the multiframe.

The mobile switching center 6 checks the multiframe number in the header 195 of the packet format 194 received by the two radio base stations 11 and 13 during the handover, and knows the order of the information, and in that order. Accordingly, the packet signal 197 modified in the packet format 194 is transmitted to the database 2 via the public network 1. At that time, the header 198 of the packet signal 197 transmitted by the mobile switching center 6 is a packet header defined in the public network 1.

In addition, since the header 195 of the packet format 194 transmitted from the radio base stations 11 and 13 to the mobile switching center 6 is used only in the closed system in the mobile communication system, it is used in the public network 1. The structure may be different from the header 198 of the packet signal 197. That is, in the above example, the multiframe number of the information is added. When the packet format is changed in the radio base stations 11, 13 and mobile switching station 6, the parts of the information data 193, 196 and the ATM packet information 199 change their contents. Of course, there is no need.

As described above, according to the fifth embodiment, by adding the multiframe number on the radio channel to the packet header transmitted to the mobile switching station, the mobile switching station can identify the sequence number of the signal transmitted by the mobile station. Therefore, there is an effect that the sequence number of the information transmitted from the mobile switching center to the public network can be avoided at the time of handover.

<Example 6>

Next, as a sixth embodiment of the present invention, a structure of a mobile station for TDMA / time division CDMA / high speed TDMA / high speed time division CDMA communication scheme will be described.

13 is a block diagram showing the configuration of such a mobile station according to Embodiment 6 of the present invention. In the figure, reference numeral 201 denotes an antenna, reference numeral 202 denotes a transmission / reception distribution unit that performs distribution of signals received by the antenna 201 and signals transmitted by the antenna 201, and reference numeral 203 denotes an antenna 201. An RF (Radio Frequency) receiver for amplifying the received signal is a RF transmitter for amplifying a signal transmitted from the antenna 201. In addition, the RF receiver 203 has a built-in switch for selecting a transmission method, that is, a communication method capable of transmitting the required amount of information in synchronization with the time slot, and switches the output destination corresponding to the communication method.

205 has a high speed and low speed equalizer for removing delayed propagation distortion due to the propagation path, and high speed / demodulation for demodulating the signal selected / output by the RF receiver 203 when using a low speed TDMA or high speed TDMA channel. A low-speed equalization demodulator, 206, multiplies the spreading code assigned to the own station by a signal selected / output by the RF receiver 203 when using a spreading-coded time division CDMA channel using a spreading coding signal (decoding). A correlation receiving / despreading coding operation unit which extracts an original signal that is not spread-coded (correlation reception) and outputs it to the high speed / low speed equalization demodulator 205. 207 is a channel reception / TDMA separation unit (hereinafter referred to as CH reception / TDMA separation unit).

208 corrects errors of the information separated by the CH reception / TDMA separation unit 207, decodes the data or voice signals from the information, and supplies the error correction / voice to the interface of the man machine (not shown). It is a decoder. Reference numeral 209 denotes an error correction / voice coding unit for encoding data or audio signals supplied from the interface of the man machine and adding a code for error correction thereto. The control unit 210 executes the decoding of the control data separated by the CH reception / TDMA separation unit 207, instructs the mobile station of various functions according thereto, and generates control data of the response thereto. Processor.

Reference numeral 211 multiplexes the error corrected / decoded data or the audio signal and the control data from the control information processor 210 by the error correction / voice encoder 209 and assembles the multiplexed information into necessary timeslots in the frame format. And a channel transmitter / TDMA multiplexer (hereinafter referred to as a CH transmitter / TDMA multiplexer). In addition, the CH transmission / TDMA multiplexer 211 has a built-in switch for selecting a transmission method, that is, a communication method capable of transmitting a required amount of information in synchronization with the time slot, and switches the output destination corresponding to the communication method. Reference numeral 212 denotes a modulator for modulating information output from the CH transmitter / TDMA multiplexer 211 and outputting the information to the RF transmitter 204 when using a low speed TDMA or a high speed TDMA channel, and 213 denotes a time division CDMA channel. In this case, it is a correlation encoding / spreading encoding unit that spreads and encodes the information output from the CH transmission / TDMA multiplexer 211 on the frequency axis using a spreading code assigned to the local station and inputs it to the modulator 212.

214 is a burst which performs control of the firing time of the radio bursts emitted from the own station, time setting in the frame for setting which time slot to emit radio waves, further time measurement for transmission timing setting of the radio bursts, and the like. Control / in-frame time setting / time measurement. 215 is a spreading code generator / chiprate generator for generating a chip rate used for time measurement in the burst control / in-frame time setting / time measurement unit 214 or a spreading code assigned to the own station.

Reference numeral 216 denotes a data buffer memory serving as a storage means for accumulating high-speed data as information included in timeslots multiplexed by the CH reception / TDMA separator 207 or information of microslots in the timeslots. 217 is a data buffer for discarding the information accumulated by the number according to the contents of the repetition code transmitted from the control information processor 210 which has received the control data separated by the CH reception / TDMA separation unit 207. It is a frame synchronization control processor as a control means for instructing the memory 216.

Next, the discarding of the information received in duplicate by the mobile station configured in this way will be described.

The mobile station shown in Fig. 13 can realize handover on a mobile communication system having an asymmetric communication channel. For example, consider a case where a fast data channel by a TDMA scheme is set for large capacity transmission in a falling line as shown in FIG. 10, and the signal from the switching base station is slower than the signal from the switching source base station. In such a case, the high frequency signal of the TDMA high speed data channel input from the antenna 201 is inputted to the RF receiving unit 203 via the transmission / reception distribution unit 202 and supplied to the high speed / low speed equalization demodulator 205 having an equalizer. After conversion into a digital signal, the CH reception / TDMA separation unit 207 separates the data into multiple pieces of control information and fast data. The separated control information is sent to the control information processor 210, and the high speed data information is sent to the data buffer memory 216, respectively.

When the handover shown in Fig. 10 is initiated, the control information sent to the control information processor 210 communicates the information of which frame of the multi-frame to perform handover switching and a repetition code. 210 transmits the information to the frame synchronization control processor 217. The frame synchronization control processor 217 instructs the data buffer memory 216 to discard the information of the first microslot of the frame by the number specified by the repetition code at the time of the switching frame number. The remaining information is supplied from the data buffer memory 216 to the error correction / voice decoding unit 208 and the error corrected information is output to the interface of the man machine.

In addition, as described in "Handover on a rising line" of the fifth embodiment, in the mobile communication system, the handover processing on the rising line is not particularly a problem between the mobile station and the radio base station. Does not require special handling. Therefore, the case where the rising line is the low speed data will be described here with reference to FIG.

The low-speed data input from the data generation source (man machine interface) is executed by the error correction / voice coding unit 209, such as error correction, and the control information processor 210 by the CH transmission / TDMA multiplexer 211. Multiplexed with control information from In the case of using a time division CDMA channel with low-speed data, the multiplexed signal is CDMA encoded by the correlation encoding / spreading encoding operation unit 213, and the modulator 212, the RF transmitter 294, the transmission / reception distribution unit 202, and the antenna 201. Is transmitted to the radio base station via

In addition, the processing of this rising line is described in Japanese Patent Application No. Hei 9-164817, which is an earlier-patent patent in which the outline of the third embodiment is described and cited, therefore, a low-speed CDMA data channel is set on the falling line. In one case or when the rising line is high-speed data, the description is omitted.

As described above, according to the sixth embodiment, the data buffer memory 216 having a function of deleting the data of the descending line when the mobile station used in the mobile radio system performs the handover and the frame synchronization control processor controlling the same. It is sufficient to set 217, and the mobile station does not need to be particularly aware of the handover about the delay of the data except for switching to the switching base station radio parameters (frequency, timeslot, etc.) with respect to the rising line. There is.

<Example 7>

Next, as a seventh embodiment of the present invention, a structure of a radio base station for TDMA / time division CDMA / high speed TDMA / high speed time division CDMA communication scheme will be described.

14 is a block diagram showing the configuration of such a radio base station according to Embodiment 7 of the present invention. In the figure, reference numerals 221 and 222 denote an antenna 201, a transmission / reception distribution unit 202, an RF receiver 203, an RF transmitter 204 and a data buffer memory 216 in the mobile station shown in FIG. It is a signal processing unit having a function equivalent to that of the frame synchronization control processor 217. Reference numerals 223 and 224 denote adders for adding signals output from a plurality of signal processors, including the signal processor 221 and 222, 225 denotes an RF transmitter, 226 denotes an RF receiver, Reference numeral 227 denotes a transmission / reception distribution unit, and 228 denotes an antenna.

Reference numerals 231 to 238 and 241 to 248 denote channel allocation memories as storage means for storing information included in the timeslots or information of the microslots in the timeslots. 235, 241, and 245 are for time division CDMA channel conversion, and memory 232, 236, 242, and 246 are for low speed TDMA data channel conversion, and memory 233, 237. Are used for fast TDMA / fast time division CDMA data channel conversion, and memories 234, 238, 244, and 248 are used for TDMA / time division CDMA control channel conversion, respectively. do. In these memories 231 to 234 and 241 to 244 and memories 235 to 238 and 245 to 248, the conversion directions are reversed.

251 selects one of the memories 231 to 234 to connect to the signal input of the signal processor 221, i.e., to select a communication method in synchronization with the timeslot for transmitting the required amount of information. A switch 252 is a switch for selecting a communication method for connecting the information input of the signal processor 221 to one selected from the memories 235 to 238. Similarly, reference numeral 253 denotes a switch for selecting a communication method for selecting one of the memories 241 to 244 and connecting to the information input of the signal processor 222, and reference numeral 254 denotes information of the signal processor 222. A switch for selecting a communication method for connecting an input to one selected from the memories 245 to 248.

Reference numeral 255 controls the memories 231 to 234, and stores information already transmitted by the number specified by the content of the repetition code received by the mobile switching center 6, and stores the information stored at the start of the handover. The frame synchronization processor is a control means for executing retransmission and controlling the memories 235 to 238 and adding a new header including a serial number to the received information. 256 controls the memories 241 to 244, and stores the information already transmitted by the number specified by the content of the repetition code received by the mobile switching center 6 to store the information stored at the start of the handover. A frame synchronization processor as a control means for executing retransmission and adding a new header including a serial number to the received information by controlling the memories 245 to 248. Reference numeral 257 denotes an exchange interface that takes an interface between the radio base station and the mobile switching station 6.

15 is a block diagram showing the internal structure of the signal processing units 221 and 222, where 260 is an error correction / voice coding unit, 261 is a CH transmission / TDMA multiplexer, Reference numeral 262 denotes a modulator, 263 denotes a correlation encoding / spreading encoding unit, 264 denotes a burst control / in-frame time setting / time measurement unit, 265 denotes a spreading code generator / chip rate generator, and 266 denotes a high speed / A low-speed equalization demodulator, 267 is a correlation reception / despread coding operation unit, 268 is a CH reception / TDMA multiple separation unit, and 269 is an error correction / voice decoding unit, which is equivalent to the corresponding part shown in FIG. will be.

Next, an operation in the case where the radio base station configured as described above is used as the switching base station at the time of handover will be described.

The operations of the units 260 to 269 in the signal processing units 221 and 222 shown in FIG. 15 show the internal structure of each unit 205 in the mobile station shown in FIG. Since it is the same as that by-(209) and (211)-(215), the description is abbreviate | omitted here.

7 shows an example of an information arrival time difference that depends on a transmission path difference when a signal transmitted from the switching base station is earlier than a signal of the switching base station. In this case, the frame synchronization control processor of FIG. 255 controls the memories 231 to 234, and the serial number 84 is assigned at the time of handover as indicated by the corresponding frame 112 of the transmission propagation of the switching base station shown in FIG. The slot information is transmitted again to the mobile station.

That is, the frame synchronization control processor 255 is used for time division CDMA channel conversion memory 231 or low speed TDMA data channel conversion according to the content '1' of the repetition code received from the mobile switching center 6 through the exchange interface 257. Information for one time slot is accumulated in the memory 232, and the information is output to the information input of the signal processor 221 after handover. The signal processor 221 processes the received information by an operation equivalent to that of the mobile station shown in FIG. 13, and adds the adder 223, the RF transmitter 225, the transceiver 227, and the antenna 238. It transmits sequentially as a radio wave via.

In addition, although the fast TDMA data transmission shown in Fig. 11 shows a case in which the signal of the switching base station is 3 microslots faster than the signal of the switching base station, the frame synchronization control processor 255 uses the mobile switching center 6 in this case. 3 microslot information is stored in the high-speed TDMA data channel conversion memory 233 according to the content '3' of the repetition code received through the exchange interface 257 in the signal processing unit. 221 is outputted to the information input, and is sequentially transmitted as a radio wave through the adder 223, the RF transmitter 225, the transmission / reception distribution unit 227, and the antenna 228 by the signal processor 221.

Next, the operation of the radio base station as the switching base station when the signal from the mobile station is received on the rising line during handover will be described.

According to the handover process on the rising line described in the fifth embodiment, on the rising line of the switching base station, a new header including the frame number in the multi-frame is included in the header of the packet type information transmitted to the mobile switching station 6 as information. It is necessary to add This new header addition operation is performed in the memories 235 to 238 or 245 to 248 under the control of the frame synchronization control processors 255 and 256 shown in FIG.

Here, since the problem of data delay does not occur on the rising line of the mobile communication system as described above, information is deleted or delayed in the memories 235 to 238 and 245 to 248. There is no work. That is, in the memories 235 to 238 or 245 to 248, only the conversion of the information rate on the radio wave and the information rate on the wired line is performed.

As described above, according to the seventh embodiment, the memories 231 to 234 are controlled by the frame synchronization control processors 225 and 226 even when the signal of the switchover base station at handover is earlier than the signal of the switchover base station. Or the information stored in (241) to (244) is delayed and transmitted, whereby the mobile station can avoid receiving successive information in the case of handover.

<Example 8>

In each of the above embodiments, the case where the MSCs are connected to each other via the public network PSTN has been described. However, the MSs may be directly connected by additional communication lines.

16 is a system configuration diagram showing the overall configuration diagram of such a mobile communication system according to the eighth embodiment of the present invention, and a substantial part thereof is denoted by the same reference numerals as in FIG. In the figure, reference numeral 271 denotes an additional communication line which is provided between the mobile station exchange 6 and the mobile station exchange 7 and directly connects them, and 272 denotes between the mobile switching station 7 and the mobile switching station 8; These additional communication lines 271 and 272 are provided and directly connect to each other, and these additional communication lines 271 and 272 are, for example, radio base stations 13 belonging to the mobile switching center 6 and belonging to the mobile switching station 7. It is used when handover is performed between radio base stations belonging to different mobile switching stations, such as base station 21 and the like.

In FIG. 16, when it is assumed that the mobile station 18 communicating with the switch base station 13 moves and approaches the switch base station 21, the mobile switching station to which the switch base station 13 is connected ( Hereinafter, the additional communication line 271 which directly connects between the switching source mobile switching station 6 and the mobile switching station (hereinafter referred to as switching mobile switching center) 7 to which the switching base station 21 is connected. ) Is specifically used as follows.

By accessing the switching base station 21 of the mobile station 18, the switching source mobile switching station 6 needs to hand over the communication partner of the mobile station 18 from the switching base station 13 to the switching base station 21. Judge that has occurred. In the mobile switching center 6, the counterpart of the public network side in this communication is a database 2, and the information is connected via the switching station 3 and the switching station 5 belonging to the public network 1. Assume Originally, at the same time as handover, the relay function between the mobile station 18 and the database 2 is transferred from the source mobile switching center 6 to the switching base mobile switching station 7 to which the wireless base station 21 of the handover is connected. It will be common to let them do. In other words, the connection before handover is normally performed through the switching station 5, the switching station 3, the switching source mobile switching station 6, and the switching base station 13 belonging to the public network 1 starting from the database 2; A mobile station 18 is reached. The connection after the handover starts from the database 2 to the mobile station 18 via the switching station 5, the switching station 4, the switching point mobile switching station 7, and the switching point base station 21 belonging to the public network. Will be reached.

However, in the eighth embodiment, when a handover occurs, the switching station 5 belonging to the public network 1, the switching station 4, the switching station mobile switching station 7, and the switching base station start from the database 2. Switching station 5 belonging to public network 1 from the database 2 without switching immediately to the above-described final form of reaching the mobile station 18 via 21, switching station 3, switching Initially, the mobile terminal 18 arrives via the original mobile switching center 6, furthermore, the switching base mobile switching station 7 and the switching base station 21. In this case, the transfer of information from the switchover switching center 6 to the switchover switching center 7 is executed via the additional communication line 271.

Therefore, this handover is independent of the operator to which the switchover mobile switching center 6 and the switchover mobile switching center 7 (commonly referred to as a communication operator owning a system for providing a mobile communication service is called an operator). It can be carried out.

In this case, since the window to the mobile station side of the public network 1 is the mobile switching station 6 both before and after the handover, the public network 1 and the database 2 do not need to be aware of the handover. .

When the additional communication lines 271 and 272 and the mobile switching centers 6 to 8 connected by them are in the form of ATM, they are transmitted to the wireless base station to which the switching source mobile switching station 6 is connected. When the destination information of the additional header of the packet (101 in Fig. 6) is changed from the switching base station 13 to the switching base station 21, the packet is added to the additional communication line 271 and the switching base mobile switching center 7 It is possible to set the switching source mobile switch 6 and the switchover mobile switch 7 so as to reach the switchover base station 21 via e).

This also applies to the additional communication line 272, and thus description thereof will be omitted.

Here, the public network 1 and the mobile station 18 which have been executed in an intermediate form via the switchover switching center 6, the additional communication line 271, the switchover switching station 7, and the switchover base station 21 are used. If the communication is stopped once and the communication is resumed thereafter, the mobile station 18 and the public network 1 are not returned to the intermediate form again, but through the switch base station 21 and the switch station mobile switching center 7. You can do this.

Further, the switchover base station 13 belonging to the switchover mobile switching station 6 is handed over to the radio base station 21 belonging to the mobile switching station 7 and handed to the radio base station 31 belonging to the mobile switching station 8. If the overrun mobile station 18 is still communicating after handover, information from the switchover base station 31 currently communicating with the mobile station 18 is transferred to the switchover mobile switching station 8 to which the switchover base station 31 belongs. Transmit to the switching center mobile switching center 6 via the additional communication line 272, the mobile switching center 7, and the additional communication line 271, and transmits from the switching source mobile switching station 6 to the public network 1; have.

As described above, according to the eighth embodiment, it is possible to make handover generation independent of the public network by setting up additional communication lines directly connecting the mobile switching centers and headers passing through the mobile switching centers. There is an effect that the handover between radio base stations connected to the mobile switching center belonging to can be handled similarly to the handover between radio base stations belonging to the same operator.

As described above, in the mobile communication system according to the present invention, the FDMA / TDD scheme, the multicarrier TDMA scheme, the CDMA / TDD scheme, the time division CDMA scheme, and the like are carried out by the communication channel modulated by the digital modulation scheme between the mobile station and the radio base station. And a mobile switching center having a TDMA signal and a time slot common / frequency channel common (including non-frequency common) time division CDMA signals, and having a control function for assigning these signals on the time axis and the frequency axis. The mobile communication in which a mobile station and a radio base station, which are effective for controlling the handover of a mobile station in a mobile communication system for a common time slot / frequency channel and have a high speed data transmission function, are wirelessly connected to a high speed data transmission channel. This is valid for handover control in the system.

Claims (32)

The mobile stations and at least one radio base station are wirelessly connected by a multiple access method. A time slot common / frequency channel having a TDMA signal and a time slot shared / frequency channel shared time division CDMA signal or a timeslot shared time division CDMA signal and having a mobile switching station having a control function for assigning these signals on the time axis and the frequency axis. In a common mobile communication system, That information in each time slot in frames of two descending lines transmitted from two adjacent radio base stations to one mobile station has a serial number assigned by the mobile switching station to which the two radio base stations are connected. Characterized in a mobile communication system. The method of claim 1, A mobile communication system having a function of detecting a serial number contained in information of each time slot in a frame of two falling lines transmitted from two radio base stations. The method of claim 1, A mobile switching station having a function of repeatedly setting a serial number included in information of each time slot in a frame of a signal transmitted from the mobile switching station to a radio base station at every multiframe number or an integer multiple of the radio channel; Communication system. The method of claim 1, When the mobile station performs a handover from the switchover base station, which is the radio base station with which the mobile station is currently communicating, to the switchover base station, the radio base station to which the communication is reconnected by the movement of the mobile station, Receiving a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station and a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station; Detecting and carrying out their comparison, And a repetition code generated by the difference information of the two serial numbers, and transmitted to the mobile switching center via the switch base station. The method of claim 4, wherein The repetitive code generated by the mobile station is an integer if the signal transmitted from the switching base station is slower than the signal transmitted from the switching base station, and an integer number if the signal transmitted from the switching base station is faster than the signal transmitted from the switching base station. Characterized in a mobile communication system. The method of claim 1, When the mobile handovers from the switching base station to the switching base station, Receiving a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station and a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station; Detecting and carrying out their comparison, If the signal transmitted from the switch base station is slower than the signal transmitted from the switch source base station, the information on the timeslot of the signal newly received by the switch base station at handover is determined by the difference information of the two serial numbers. A mobile communication system having a function of destroying as many as the content of the repetition code. The method of claim 1, Use an ATM-type exchange at a mobile switching center, And the mobile switching station adds a new header to the head of the ATM packet to perform the assignment of the serial number contained in the information of each time slot in the frame. The method of claim 7, wherein When the information bit for which a mobile switching station can transmit one time slot of a radio channel is less than one packet of information packet of an air network packet transmitting the public network, the information of the public network packet is divided into timeslot information bits of the radio channel. And constructing a packet each having the divided information and transmitting the packet to the radio base station. The method of claim 7, wherein If the information bit for which a mobile switching station can transmit one time slot of a wireless channel is larger than the information bit for one packet of the public network packet, the variable information amount of packet information transmitted to the wireless base station without being divided is divided. Mobile communication system characterized in that it has. The method of claim 7, wherein A mobile communication system, characterized in that the switch interface of the radio base station is in the form of ATM. The method of claim 1, When the mobile handovers from the switching base station to the switching base station, Receiving a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station and a serial number included in the information of each timeslot in the frame of the signal being transmitted from the switching base station; Detect and execute their comparison, and generate a repetition code based on the difference information of the two serial numbers; When the radio base station becomes the mobile base station at the time of handover of the mobile station, When the signal transmitted from the switching base station is earlier than the signal transmitted from the switching base station, the repetition code is commanded at the time of handover and information of the timeslot of the signal already transmitted to the mobile station is determined according to the contents of the repetition code. Keep as many as you can, And a function of sequentially transmitting signals to the mobile station with the information of the timeslot held simultaneously with the handover. At the same time that the mobile station and the at least one radio base station are wirelessly connected by the multiple access method, The mobile station having a high speed data transmission function is wirelessly connected to the wireless base station via a high speed data channel, A time slot common / frequency channel having a TDMA signal and a time slot common / frequency channel common time division CDMA signal or a time slot common time division CDMA signal and having a mobile switching station having a control function for assigning their signals on the time axis and the frequency axis In a common mobile communication system, The information of each microslot of the fast data transmission channel transmitted in each time slot in the frames of two falling lines transmitted from two adjacent radio base stations to one mobile station is connected to the two radio base stations. And a serial number assigned by said mobile switching center. The method of claim 12, The mobile station has a function of detecting a serial number contained in information of each microslot of a high speed data transmission channel transmitted in each time slot in a frame of two falling circuits transmitted from two radio base stations. Mobile communication system. The method of claim 12, The serial number contained in the information of each microslot of the fast data transmission channel transmitted in each time slot in the frame of the signal transmitted from the mobile switching station to the radio base station is determined by the number of multiframes of the radio channel or the like. A mobile communication system having a function of repeatedly setting each integer multiple. The method of claim 12, When the mobile handovers from the switching base station to the switching base station, Serial numbers included in the information of each microslot of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching base station and each of the frames of the signal transmitted from the switching base station. Receive and detect serial numbers included in the information of each microslot of the high speed data transmission channel being transmitted in the timeslot, and perform their comparison, And a function of generating a repetition code based on the difference information of the two serial numbers and transmitting it to the mobile switching center via the switchover base station. The method of claim 12, When the mobile handovers from the switching base station to the switching base station, A serial number included in the information of each microslot of the fast data transmission channel being transmitted in each time slot in the frame of the signal being transmitted from the switching base station and each of the frames of the signal being transmitted from the switching base station Receive and detect serial numbers included in the information of each microslot of the high speed data transmission channel being transmitted in the timeslot, and perform their comparison, If the signal transmitted from the switch base station is slower than the signal transmitted from the switch source base station, the information on the microslot of the signal newly received by the switch base station at handover is determined by the difference information of the two serial numbers. A mobile communication system having a function of destroying as many as the content of the repetition code. The method of claim 12, When the mobile handovers from the switching base station to the switching base station, A serial number included in the information of each microslot of the high-speed data transmission channel being transmitted in each time slot in the frame of the signal being transmitted from the switching base station and each of the frame of the signal being transmitted from the switching base station Receives and detects serial numbers included in the information of each microslot of the fast data transmission channel being transmitted in the timeslot, performs comparison thereof, and generates a repetition code based on the difference information of the two serial numbers. With When the radio base station becomes the mobile base station at the time of handover of the mobile station, When the signal transmitted from the switching base station is earlier than the signal transmitted from the switching base station, the repeating code is commanded at the time of handover, and information on the microslot of the signal already transmitted to the mobile station according to the contents of the repeating code Keep as many as you can, And a function of sequentially transmitting signals to the mobile station with the information of the microslot held simultaneously with the handover. The method of claim 17, A mobile communication system having a function of receiving a repetition code generated by a mobile station through a switch base station, determining handover, and transmitting the repetition code to a switch base station. The mobile stations and the at least one radio base station are wirelessly connected by a multiple access method. A time slot common / frequency channel having a TDMA signal and a time slot common / frequency channel common time division CDMA signal or a time slot common time division CDMA signal and having a mobile switching station having a control function for assigning these signals on the time axis and the frequency axis In a common mobile communication system, When the radio base station transmits the information included in the timeslot received by the mobile station to the mobile switching station to which the radio base station is connected, the serial number associated with the multiframe of the radio channel is added to the information from the mobile station. A mobile communication system having a function. The method of claim 19, And the mobile switching station has a function of detecting a serial number associated with the multiframe of the radio channel included in the information of the timeslot transmitted from the wireless base station to the mobile switching station. The method of claim 19, The radio base station has a function of repeatedly setting the serial number associated with the multiframe of the radio channel included in the information of the timeslots transmitted by the radio base station to the mobile switching station every multiframe number or an integer multiple of the radio channel. Mobile communication system. The method of claim 19, The radio base station has a function of adding, as a header, the serial number associated with the multiframe of the radio channel included in the information of the timeslot transmitted by the radio base station to the mobile switching center at the head of the information packet for transmitting to the mobile switching station. Mobile communication system. The method of claim 19, The mobile switching station checks the serial numbers included in the headers of the information packets of signals transmitted from the two radio base stations to the mobile switching station at the time of handover, and the information is arranged so that the sequence of the serial numbers included in the headers is correctly aligned. A mobile communication system having a function of sequentially transmitting packets to a public network. At the same time that the mobile station and the at least one radio base station are wirelessly connected by the multiple access method, The mobile station having a high speed data transmission function is wirelessly connected to the wireless base station via a high speed data channel, A time slot common / frequency channel having a TDMA signal and a time slot common / frequency channel common time division CDMA signal or a time slot common time division CDMA signal and having a mobile switching station having a control function for assigning these signals on the time axis and the frequency axis In a common mobile communication system, To the mobile station Storage means for accumulating the information included in the timeslot received by the radio base station or the information of the microslots in the timeslot; And a control means for destroying the information stored in said storage means by a specified number in accordance with the contents of the repetition code during handover. At the same time that the mobile station and the at least one radio base station are wirelessly connected by the multiple access method, The mobile station having a high speed data transmission function is wirelessly connected to the wireless base station via a high speed data channel, A time slot common / frequency channel having a TDMA signal and a time slot common / frequency channel common time division CDMA signal or a time slot common time division CDMA signal and having a mobile switching station having a control function for assigning these signals on the time axis and the frequency axis In a common mobile communication system, To the base station Storage means for accumulating information included in the transmitted time slot or information of the microslot in the time slot; At the same time as accumulating in said storage means the information contained in the time slot immediately before the handover or the information of the microslot in the time slot, according to the content of the repetition code transmitted from the mobile switching station to which the radio base station is connected, And a control means for retransmitting the information included in the time slot immediately before the handover or the information of the microslot in the time slot, which is accumulated in the storage means at the time of handover. The mobile stations and the at least one radio base station are wirelessly connected by a multiple access method. A mobile switching station having a TDMA signal and a time slot common / frequency channel shared time division CDMA signal or a time slot shared time division CDMA signal, and having a control function for allocating these signals on the time axis and the frequency axis; In a mobile communication system for a common time slot / frequency channel in which several mobile switching stations are connected to a public network, And a plurality of mobile switching stations connected directly to each other via an additional communication line without passing through the public network. The method of claim 26, When handing over to a switching base station connected to a mobile switching station different from the mobile switching station to which the switching base station is connected, The information from the switching base station communicating with the mobile station after the handover is transmitted from the mobile switching station to which the switching base station is connected to the mobile switching station to which the switching source base station is connected via an additional communication line. A mobile communication system, characterized in that transmitted from the switching center to the public network. The method of claim 27, Information from the switching base station communicating with the mobile station after the handover is transmitted from the mobile switching station to which the switching base station is connected to the mobile switching station to which the switching source base station is connected via the additional communication line, and at the mobile switching station. If the communication is resumed once the communication to the public network is terminated, And the information from the mobile station is directly transmitted from the switched base station to the public network via the mobile switching center to which the switched base station is connected. The method of claim 26, A mobile communication system, characterized in that several mobile switching stations connected by additional communication lines belong to different operators. The method of claim 26, A mobile communication system comprising an ATM type exchanger for several mobile switching centers connected by an additional communication line. The method of claim 26, A mobile communication system characterized in that the additional communication line connecting several mobile switching stations to each other has an ATM type. The method of claim 26, After the mobile station has handed over several radio base stations belonging to several mobile switching stations, the information from the switching base station currently communicating with the mobile station when the mobile station is still in communication is transmitted via the mobile switching station to which the switching base station is connected. A mobile communication system characterized by transmitting from a mobile switching station to which a switching source base station is connected to a public network through a plurality of mobile switching stations and a plurality of additional communication lines connecting each other.