JP2001320316A - Radio data communication system, base station, mobile station, radio server and computer-readable storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the influence of selective fading and to also realize fast data transmission in a radio data communication system which uses networks. SOLUTION: A transmission signal 10 from a base station 4 is modulated with a DS/SS, using a base station identification number. Mobile stations 1 and 2 (5-1 and 5-2) retrieve the base station identification number from the signal 10 and obtain transmission data to a self-station through back-diffusion by using the number. Transmission data is subjected to packet multiplexing by IPMA method, in an illustrated example, the mobile station obtains the packet of an MS1 from the signal 10, and the mobile station 5-2 obtains the packet of an MS2. The respective mobile stations perform DS/SS modulation of the signal, by using the base station identification number of the base station, where the respective mobile stations are registered and transmit the packet of the MS1 or the MS2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio data communication system suitable for mobile radio data communication using a network such as the Internet, a base station, a mobile station, and a radio server as components of this system. The present invention relates to a computer-readable storage medium used for components.

[0002]

2. Description of the Related Art A wireless data communication system used for connecting a terminal device to the Internet using wireless communication has been proposed by the present applicant (Japanese Patent Application No. Hei 10-1998).
262099, Japanese Patent Application No. 11-139311). In this wireless data communication system, at least one wireless server connected to the Internet, a plurality of base station radios for communicating with the radio server, and communication with the base station radio and connection to a terminal device And at least one mobile radio device. And one of the at least one wireless server for one terminal device.
By positioning one wireless server as a home wireless server and communicating with a mobile wireless device in an area where a base station wireless device of the home wireless server can wirelessly communicate, by connecting the terminal device to the Internet, It is characterized by realizing a multiple access system (IPMA).

For example, in the above-described wireless data communication system, TDMA (Time Division Multiple Access), FDMA are used as a communication system between a base station radio and a mobile radio.
(Frequency division multiple access system), CDMA (code division multiple access system), and the like. For example, because of high utilization efficiency, C
When the DMA method is used, it is necessary to (1) increase the utilization efficiency by controlling power so as to minimize mutual interference in the base station band, or (2) speed up communication by multi-user reception in the band. I have to.

In the modulation method based on the QAM or PSK method generally used in TDMA or FDMA, physical measures such as reducing the antenna directivity and the cell radius are required to perform high-speed data transmission due to the influence of multipath fading. For high-speed moving objects, network control becomes complicated and signal quality deteriorates drastically, resulting in low communication quality. In addition, the number of base stations increases, and the network cost between base stations also increases.

[0005]

However, in the power control of the above (1), it is difficult to control the power when fading occurs during the movement of the mobile radio. It is not suitable for use in systems intended for mobile objects such as ITS.
In the method of (2) for increasing the speed by the multi-user communication, the user management must be physically performed, so that the base station management control becomes complicated.

(3) In high-speed data transmission, CDMA
When a multi-user scheme is used, the number of multiple access becomes maximum in one cell, so that the frequency utilization efficiency in one channel of the base station becomes maximum, but interference when performing frequency reuse is a problem. Therefore, sectorization by an antenna and precise zone design are required.

(4) When performing SS communication, communication requires a wide band radio frequency. By using the CDMA scheme, the use efficiency in the band can be improved. However, since there is a restriction on the use method by repetition, it is necessary to use different frequencies for adjacent cells.
There are few frequencies that can use such a radio band, and system expansion cannot be performed easily.

(5) When the capacity of the base station is large, the utilization efficiency is high if there are sufficient users in the coverage area range, but if the number of users is small, there is useless storage. (6) In the case of CDMA, the utilization efficiency is said to be higher than that of ordinary FDMA or TDMA, but there is great expectation for voice activation in voice communication. Since the data communication is a continuous signal, there is no factor for improving the efficiency by voice activation. Usage efficiency is not necessarily high for data communication.

(7) Except for special cases that require image data, data that conveys the operating state of equipment, automobiles, etc., is information that is mostly small, such as position, moving speed, and engine speed. Become. When such information is handled by the same system, in a wireless data system corresponding to high-speed data, secondary modulation or the like that performs spreading has an excessive modulation capacity and is inefficient. (8) In wireless data communication, there have been problems that it is difficult to perform high-speed data transmission to a high-speed mobile object, system expansion is difficult, efficiency is low, and system cost is high.

(9) TDMA, FDMA and CDMA are
When traffic increases in a service area managed by one base station, a connection cannot be established, and a throughput is reduced. This is because in a service area design using a cell configuration, it is not possible to distribute traffic within a cell. Such interruption of communication due to inability to perform handover in a state where connection is not possible and a decrease in throughput cause a delay in data communication, and significantly degrade communication quality.

Accordingly, an object of the present invention is to solve the above-mentioned problems (1) to (9) without using the CDMA system. The first object of the present invention is to realize high-speed mobile communication. That is. A second object is to stabilize communication quality and system during high-speed movement. A third object is to facilitate wireless area management. A fourth purpose is to facilitate system expansion. A fifth object is to increase the frequency use efficiency. A sixth object is to reduce system maintenance costs. A seventh objective is to reduce initial investment costs. An eighth object is to improve system efficiency degradation due to excessive capacity for user usage data. A ninth object is to improve communication quality in wireless data communication by distributing traffic.

[0012]

In order to achieve the above object, a wireless data communication system according to the present invention comprises at least one wireless server disposed on a network and one or more wireless servers.
A plurality of wireless base stations communicating with one wireless server, and at least one mobile station wirelessly communicating with one wireless base station. In a wireless communication data system based on a multiple access method, the wireless base station and the mobile station It is characterized by performing communication using a signal modulated by a direct spread spectrum modulation method between them.

[0013] A base station according to the present invention comprises at least one wireless server disposed on a network, a plurality of base stations wirelessly communicating with one wireless server, and at least one mobile station communicating with a plurality of base stations. The base station in a wireless data communication system using a multiple access method, wherein the base station is provided with communication means for communicating with the mobile station using a signal modulated directly by a spread spectrum modulation method.

A mobile station according to the present invention includes at least one wireless server disposed on a network, a plurality of base stations communicating wirelessly with one wireless server, and at least one mobile station communicating with a plurality of base stations. The mobile station in the wireless communication data system based on the multiple access method, wherein the mobile station is provided with communication means for performing communication with the base station using a signal modulated directly by the spread spectrum modulation method.

[0015] A wireless server according to the present invention comprises at least one wireless server arranged on a network, a plurality of base stations wirelessly communicating with one wireless server, and at least one mobile station communicating with a plurality of base stations. The wireless server in a wireless communication data system based on a multiple access scheme that performs communication using a signal modulated by a direct spread spectrum modulation scheme between the base station and the mobile station, wherein the mobile station is A control means for performing control when speeding up by multi-user reception is provided.

The computer-readable storage medium used in the base station according to the present invention stores a program for executing communication processing for performing communication with a mobile station using a signal modulated by a direct spread spectrum modulation method. It is.

A computer-readable storage medium used in a mobile station according to the present invention is a communication medium that performs multi-user reception by digital overlay for receiving from a plurality of base stations in an area where the communication range of a plurality of base stations intersects. This stores a program for executing a receiving process for speeding up the process.

A computer-readable storage medium used in the wireless server according to the present invention stores a program for executing a control process when a mobile station performs high-speed reception by multi-user reception.

Another wireless data communication system according to the present invention includes at least one wireless server disposed on a network, a plurality of base stations communicating with one wireless server,
In a multiple access wireless data communication system comprising at least one mobile station communicating with a plurality of base stations, the plurality of base stations communicate with a first base station performing narrowband communication with the mobile station. The mobile station selects a base station that performs communication according to the throughput of each base station in an area where signals transmitted from each base station intersect, and the selected mobile station is selected. A communication is performed with the first or second base station, and at that time, communication is performed using a signal modulated by the first modulation scheme for narrowband communication or the second modulation scheme for wideband communication. It was made.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless data communication system according to an embodiment of the present invention. In FIG. 1, 1 is a host server, and 2 is a network to which the host server 1 is connected. 3-n is a wireless server connected to the network 2. 2a, 2b,
2c is a subnetwork constructed under the management of the wireless server 3-n. 4-n is a base station radio connected to the radio server 3-n, and a plurality of base station radios 4-n are connected to one radio server 3-n. Here, only one base station radio 4-n is shown for one radio server 3-n.

Reference numeral 5 denotes a terminal device connected to the wireless server 3-n by wireless communication.
n and a mobile terminal (hereinafter, referred to as a mobile device) 5a that communicates with the mobile device 5a wirelessly, and a computer terminal (hereinafter, referred to as a terminal) 5b connected to the mobile device 5a. In addition,
The host server 1 may be a wireless server that wirelessly communicates with a terminal, or may not necessarily have a wireless communication function.

The terminal device 5 uses any one of the wireless servers 3-n connected to the network 2 as a home server. Here, it is assumed that the home server of the terminal device 5 shown in FIG. 1 is the wireless server C3-3.

Next, the operation of the wireless communication system having the above configuration will be described. FIG. 2 is an explanatory diagram illustrating an operation of the wireless communication device according to a time change. In FIG. 2, "Ds
“t” represents a transmission destination, and “Src” represents a transmission source.

Here, the home server of the terminal device 5 is:
At present, the terminal device 5 is used as the wireless server C3-3.
Is operating under the management of the wireless server A3-1.

First, the operation when the terminal device 5 moves from the subnetwork 2a of the radio server A3-1 to the subnetwork 2b of the radio server B3-2 will be described.

First, the terminal device 5 requests the wireless server B3-2 for terminal registration authentication and IP address issuance (FIG. 2 (a)). In response, the wireless server B3-2 performs registration authentication and IP address issuance (FIG. 2A), whereby the terminal device 5 can operate under the management of the wireless server B3-2.

Next, in the wireless server B3-2, the terminal device 5 moves from the management of the wireless server A3-1 to the management of the wireless server B3-2 with respect to the wireless server C3-3 as the home server. Notification that registration authentication has been completed (FIG. 2B).

Next, the wireless server C3 as a home server
-3 notifies the wireless server A3-1 that the terminal device 5 has moved under the management of the wireless server B3-2, in response to the registration completion notification from the wireless server B3-2. Thereby, the wireless server A3-1 receives the registration completion notification and stops managing the terminal device 5. Further, the wireless server C3-3 (home wireless server) records that the terminal device 5 is under the management of the wireless server B3-2, and updates the management information.

Further, the fact that the terminal device 5 has moved is notified to the wireless server A3-1 via the wireless server C3-3, which is a home server, whereby the terminal device 5 is controlled by any wireless server. This is to determine whether the user has moved. By such an operation, the terminal device 5 can move under the management of another wireless server B3-2.

As described above, according to this wireless communication system, one wireless server is positioned as a home server for a terminal device, and this wireless server is provided with terminal authentication management means and terminal management means. Because the server authenticates the terminal connection and issues the IP address,
The effect is obtained that the terminal device can perform communication in an area other than the home server.

FIG. 3 is a block diagram showing an embodiment of the mobile radio and the base station radio in FIG. First, an outline of the present embodiment will be described. In the radio communication system using the mobile radio and the base station radio according to the present embodiment, a single frequency channel is used for each of uplink and downlink for communication between the mobile radio and the base station radio. Therefore, the same frequency is used for the control channel (CCH) carrying the control signal and the communication channel (TCH) carrying the data. The base station radio uses a duplex method, and the mobile radio uses a simplex half-duplex communication method or a duplex method.

The base station radio always transmits a transmission packet (downlink information). The mobile wireless device always detects downlink information and performs transmission as necessary. The communication between the base station radio and the mobile radio is DSMA (Digital).
Sense Multiple Access) method is applied. DSMA is a communication channel (TCH)
This is a method of receiving information on the idle / busy state as a digital signal and performing communication by knowing the idle / busy state based on the analysis result.

Further, in the present embodiment, as will be described in more detail later, a signal modulated by a DS / SS (Direct Spread Spectrum) modulation method is used as a communication method between a base station radio and a mobile radio. I try to communicate.

Next, transmission packets transmitted from a mobile radio and a base station radio (hereinafter, referred to as a radio when no distinction is made between a mobile radio and a base station radio) will be described. As shown in FIG. 4, a transmission packet in which one set of a set of UW and RCCH and a set of CCCH or UPCH subsequent to the set of UW and RCCH as one frame is sequentially transmitted to the transmission channel of each wireless device. You. UW
(Unique Word: synchronization word) is a bit string used for frame synchronization, and is located at the beginning of each frame. UW is defined as a bit string having a specific value. RCCH (Radio Contr
ol Channel: radio control channel indicates the status (idle / busy) of the radio link, and specifies information (ID) for specifying the radio equipment of the transmission destination, and the subsequent CCCH / U
Contains information about PCH. The RCCH transmitted from the base station radio is received by all mobile radios.

The CCCH (Common Control)
Channel: common control channel includes control information (call request, connection request, etc.) and the data length of data to be transmitted. The CCCH transmitted from the base station radio may include peripheral base station information including channel information of the peripheral base station and the like, and is received by one or more mobile radios specified by the RCCH. UPCH (User Packet)
CHannel: a user packet channel) is composed of data transmitted to a destination radio, and when transmitted from a base station radio, is received by one or more mobile radios specified by RCCH. Note that RCCH corresponds to the first packet, and CCCH and UPCH correspond to the second packet.

Next, the configuration of the mobile radio and the base station radio according to the present embodiment and the operation of each unit will be described. In the present embodiment, the configurations of the mobile radio and the base station radio are the same.

The radio device of the present embodiment receives an input signal, is connected to a receiver R1 connected to an RCCH analyzer R3, a decoder R2 connected to the receiver R1, and an RCCH analyzer connected to the decoder R2. Unit R3, a CCCH analyzing unit R4 connected to the decoder R2 and the RCCH analyzing unit R3, and a UPC also connected to the decoder R2 and the RCCH analyzing unit R3.
H analysis unit R5 and ID connected to CCCH analysis unit R4
Checking unit R6, retransmission control unit R7 connected to UPCH analysis unit R5, and RCCH connected to RCCH analysis unit R3
Generator R8, CCCH generator R9 connected to ID checker R6, UPCH generator R10 connected to retransmission controller R7, RCCH generator R8, CCCH generator R
9. The basic configuration includes an encoder R11 connected to each of the UPCH generation units R10 and a transmission unit R12 connected to the encoder R11. In the present embodiment, the decoder R
2 and intermittent standby unit R connected to RCCH analysis unit R3
13 and a range search unit R14 connected to the reception unit R1, the decoder R2, and the RCCH analysis unit R3.
Note that the in-range search here is a search for a base station identification number described later.

The receiving unit R1 receives a radio signal (transmitted packet)
And outputs received data, and detects and outputs received power data, interference power data, and the number of interference (overlay) in each base station identification number of the received wireless signal.
The decoder R2 determines whether the received data is RCCH, CCCH, UP
CH is analyzed, and according to the received data, the received data is converted into an RCCH analysis unit R3, a CCCH analysis unit R4,
The data is transferred to any one of the UPCH analyzers R5.

The RCCH analysis unit R3 analyzes the RCCH, and when it is determined that the received packet is addressed to the own station, controls the reception unit R1 so as to further receive the CCCH / UPCH following the RCCH. It should be noted that the term “addressed to the own station” includes an address assigned to the own station alone, an address addressed to a group including the own station, and a notification addressed to all mobile wireless devices. Next, when it is determined that the received packet is not addressed to the own station, the intermittent standby unit R1 performs an intermittent standby and an area search described later during the CCCH / UPCH period.
3. Control the area search unit R14. The intermittent standby and the area search are not executed simultaneously, but one of them is selectively executed by appropriate setting.
Further, the RCCH analysis unit R3 switches the base station identification number of the reception unit R1 at the time of the in-range search, and instructs the in-range search unit R14 to receive reception power data, interference power data, interference (overlay) for each base station identification number. 2.) Provide a timing signal to store the number.

Further, in the base station radio, the RCCH analysis unit R3 detects the RCC associated with the connection request from the mobile radio.
When H is received, the RCCH generation unit R8 is controlled so that busy information is immediately included in the RCCH transmitted from the own station. The mobile wireless device detects whether transmission is possible based on busy information included in the RCCH. Transmission is possible in the idle state, and transmission is not possible in the busy state. Furthermore, when the channel information stored by the CCCH analysis unit R4 described later includes an index corresponding to the distance from the base station radio, the RCCH analysis unit R3 performs the operation of acquiring the electric field strength based on the distance information based on the index. The receiving unit R1 is controlled so that the search channels are ordered and the transmission channel (identification number) of the closer base station radio is received first. This is because there is a high probability that a mobile radio located within the range of the currently connected base station radio will move to the communication area of the base station radio closer to the currently connected base station radio.

The CCCH analysis unit R4 analyzes a message included in the CCCH. If transmission is necessary in response to the message, the ID (transmission destination identifier) included in the CCCH is checked and predetermined information is transmitted. For example, in the case of a base station radio, a connection permission is transmitted after receiving a connection request,
After receiving the authentication response, the registration permission is transmitted. Also, CC
On the basis of the data length of data to be transmitted included in the CH (connection request, etc.), a subsequent frame sequence (a set of frames constituting a group of data having a specified data length, and transmitted to each frame) UPCH consisting of data to be
Is included) continuously. Further, when the peripheral base station information is received, the storage unit (not shown) stores the channel information (frequency and the like) included in the peripheral base station information.

The UPCH analyzer R5 analyzes data contained in the UPCH. If there is an error in the data and the error cannot be corrected, after receiving the frame sequence, the retransmission control unit R7 is controlled to transmit a retransmission request for retransmitting the error part. The ID check unit R6 checks whether the ID included in the CCCH is correct. The retransmission control unit R7 controls the UPCH generation unit R10 to include the retransmission request.

The RCCH generating unit R8 transmits the RCCH
Generate At this time, if necessary, the RCCH analysis unit R
Reference information from # 3. The CCCH generation unit R9 generates a CCCH to be transmitted. At this time, if necessary, ID
Reference is made to information from the CCCH analysis unit R4 obtained via the inspection unit R6. The UPCH generation unit R10 transmits the UP
Generate CH. At this time, if necessary, the retransmission control unit R
Reference is made to information from the UPCH analysis unit R3 obtained via the. The encoder R11 includes a synchronization UW, an RCCH generated by the RCCH generation unit R8, and a CCCH generation unit R8.
9 or CCCH or UPCH generation unit R generated by
The UPCH generated by step 10 is sequentially arranged to form a transmission packet in which one frame is formed. The transmission unit R12 transmits the transmission packet received from the encoder R11.

The intermittent standby unit R13 includes an RCCH analysis unit R3
, The intermittent standby operation (sleep: stop operation) is performed during the CCCH / UPCH period to reduce power consumption. The in-range search unit R14 also performs the in-range search during the CCCH / UPCH period under the control of the RCCH analysis unit R3. Here, the in-range search means that if a packet transmitted from the base station radio is not addressed to its own station, the C following the RCCH
It refers to an operation of sequentially scanning transmission channels (identification numbers) transmitted from neighboring base stations during the CCH / UPCH period and acquiring reception power data, interference power data, and the number of interferences of the radio wave. The area search unit R14 uses the CCCH / UPC
During the period H, the received power data, the interference power data, and the number of interferences output from the receiving unit R1 are stored in a storage unit (not shown). As an example of the storage method, the average of the electric field intensity detected in the past 10 times for each channel may be stored, or the highest electric field intensity in the past 10 times may be stored. The interference power and the number of interferences may be similarly stored.

The in-service search unit R14 stores channel information of main base station radios in a storage unit (not shown). In addition, the base station radio periodically transmits surrounding base station information including the channel information, and the area search unit R1
4 further stores this information and uses these channel information for in-area search.

By performing the above range search and previously acquiring the reception power of the identification number transmitted from the peripheral base station, the mobile radio is out of range with respect to the base station radio currently connected by radio communication. In the above process, based on the received power of the identification number stored in the storage unit in the above process, the channel of the base station radio having the received power that can be transmitted and received is determined according to the received power strength ( (In order of strength). By doing so, it becomes unnecessary to scan channels that cannot be transmitted or received, and it is possible to quickly detect channels of base station radios that can be in range.

Next, the operation of the mobile radio and the base station radio when the mobile radio (mobile station) sends a connection request to the base station radio (base station) will be described with reference to FIG.

The receiving unit R1 of the mobile radio sets the RC included in the transmission packet transmitted from the base station radio first.
Receive CH. This RCCH is transmitted to R through decoder R2.
Sent to CCH analysis unit R3, RCCH analysis unit R3 analyzes this RCCH and recognizes that the base station radio is in an idle state. Then, the RCCH generating units R8 and C
The CCH generation unit R9 generates data of the transmission packet 'including the connection request (ENQ) CCCH, and the transmission packet' is synthesized by the encoder R11 and transmitted by the transmission unit R12. The connection request includes the data length of the data to be transmitted.

The receiving section R1 of the base station radio receives the transmission packet 'transmitted from the mobile radio. The RCCH included in the transmission packet 'is sent to the RCCH analysis unit R3 via the decoder R2, and the RCCH analysis unit R3 analyzes the RCCH and recognizes that the transmission packet' is a connection request. This is because the RCCH includes information indicating that the subsequent data is the CCCH of the connection request. The RCCH generating unit R8 immediately includes the busy information in the RCCH included in the transmission packet transmitted subsequent to the transmission packet. As a result, there is no access from another mobile wireless device. Note that the CCCH included in this transmission packet has no particular meaning.

[0050] Then, the receiving unit R1 of the base station radio further receives the CCCH following the RCCH of the transmission packet '. Then, this CCCH is sent to the CCCH analysis unit R4 via the decoder R2, and the CCCH analysis unit R4 accepts this connection request.

Next, the CCCH generation unit R9 of the base station radio
Includes the connection response (ACK) in the CCCH. This CC
The CH is included in the transmission packet by the encoder R11 and transmitted to the mobile radio device that issued the connection request. Then, in order to receive the data (frame sequence) to be transmitted from the mobile wireless device, a reception reservation for at least a period required to receive the frame sequence is made based on the data length included in the previous connection request. That is, during this period, the base station radio transmits a transmission packet including busy information on the RCCH so that other mobile radios do not access.

For example, the data length to be transmitted is n
(Bit), assuming that the bit length that can be accommodated in the UPCH is m (bit), a reception reservation is made for at least a period required for receiving a frame sequence of [n / m]. Here, [] indicates a function that rounds up the value after the decimal point. Also, as shown in FIG. 3, after the base station radio is busy,
Since the time for receiving the transmission packet ′ and the time for transmitting the transmission packet are required, [n
/ M] in addition to the time required to receive the frame sequence,
It is preferable to transmit a transmission packet including busy information in the RCCH during a period necessary for receiving data (here, a time corresponding to two frames).

When receiving the transmission packet including the connection response from the base station radio, the receiving unit R1 of the mobile radio sets the RCC.
H and CCCH are respectively transmitted to RCC via decoder R2.
It is sent to the H analysis unit R3 and the CCCH analysis unit R4. Here, it is determined that the CCCH is a connection response by the CCCH analysis unit R.
4, the RCCH generator R8 and UP
The CH generation unit R10 generates data of a frame sequence including data having a predetermined data length. The encoder R11 combines and transmits a frame sequence composed of these data.

The above is the operation of the mobile radio and the base station radio when the mobile radio sends a connection request to the base station radio.

Next, with reference to the example of FIG. 6, the transmission system between the mobile radio and the base station radio according to the present embodiment will be described in comparison with the conventional system. FIG. 6 shows a response from each station when data requiring four frames is transmitted from Station A to Station B. Station A, B
One is a mobile radio and the other is a base station radio.

In the conventional method shown in the upper part of FIG. 6, data is sent from Station A to Station B in units of one frame. The state B sends a reception response (OK) every time each frame is received or a retransmission request (frame) to the station A when there is an error in the data. Finally, a disconnection request is sent.

In the present method shown in the lower part of FIG.
OnA transmits data for four frames continuously.
As described above, the Station B receives the data length of the transmitted data in advance by using the CCCH of the connection request transmitted from the Station A and knows the data length, so that it can continuously receive data for four frames. After one reception, the erroneous frame is UPCH
If the error is detected by the analysis unit R5 and the error cannot be corrected, the retransmission control unit R7 causes the transmission packet including the retransmission request to be transmitted to Station A. Station A
Receives the retransmission request from Station B and retransmits the requested frame. And the frame,
Is normally received, the state B returns a reception response, and the series of operations ends.

In the present system, the data length of the data to be transmitted is sent to the destination in advance, so that the number of times of receiving responses and retransmission requests can be reduced as compared with the conventional system, and efficient communication can be performed. Further, a cutting operation unlike the conventional method is not required. The above is the difference between the conventional method and the present method.

Next, referring to FIG. 7, mobile radios ML1, ML for packets transmitted from base station radio BS.
2. Response of otherMLs will be described.

The frame is a call request addressed to the mobile radio ML1, and the RCCH analysis unit R3 of each mobile radio transmits
By analyzing the CH, only the mobile radio ML1 receives the CCCH (paging request) following the RCCH. At this time, the other mobile wireless devices ML2 and other MLs perform the intermittent standby or the in-range search by the intermittent standby unit R13 or the in-range search unit R14. The next frame is addressed to all mobile radios, and the RCCH analysis unit R3 of each mobile radio analyzes the RCCH, and all mobile radios receive the CCCH (peripheral base station information). The frame is an authentication request addressed to the mobile radio ML2, and the RCCH analysis unit R3 of each mobile radio analyzes the RCCH, and only the mobile radio ML2 receives the CCCH (authentication request). At this time, the other mobile wireless devices ML1, otherML
For s, the intermittent standby section R13 or the area search section R14 performs intermittent standby and area search.

Next, a frame including data addressed to the mobile radio ML1 is transmitted, and the RCC of each mobile radio is transmitted.
The H analysis unit R3 analyzes the RCCH and outputs the mobile radio ML1
Only receive. The mobile wireless device ML1 knows from the data length of the transmission schedule data included in the CCCH of the call request of the previous frame that the data to be transmitted is for three frames, and continuously transmits the data for three frames. To receive. During this time, the other mobile radios ML2 and other MLs
Performs intermittent standby or in-range search by the intermittent standby unit R13 or the in-range search unit R14. The next frame is addressed to all mobile radios and the RC
The CH analysis unit R3 analyzes the RCCH, and all mobile radios receive the CCCH (neighboring base station information).

The last frame is a registration reception addressed to the mobile radio ML2, and the RCCH analysis unit R3 of each mobile radio.
Analyzes the RCCH, and only mobile radio ML2 has CCC
H (registration accepted) is received. At this time, the other mobile wireless devices ML1 and otherMLs perform the intermittent standby or the in-range search by the intermittent standby unit R13 or the in-range search unit R14.

The example of the response of each mobile radio device to the packet transmitted from the base station radio device BS has been described above.

According to the mobile radio device and the base station radio device of the present embodiment, the data is transmitted from the transmitting radio device later based on the data length of the data to be transmitted included in the second data of the transmitting radio device. Data is continuously received over the data length, and upon receiving the data of this data length, the connection with the transmitting side radio is terminated, so that the reception response can be reduced, and the line disconnection operation is required. , Efficient communication can be performed.

Further, after receiving one type of data, the base station radio is requested to retransmit an erroneous transmission packet, so that the number of retransmission requests can be reduced and more efficient communication is performed. be able to.

Further, the base station radio of the present embodiment comprises a first transmission packet transmitted from a mobile radio.
Is analyzed, and when it is determined that the second packet following the first packet is a connection request, the transmission packet including the busy information is immediately transmitted to the first packet transmitted by the base station radio. Therefore, it is possible to improve the communication efficiency and prevent a mobile wireless device other than the mobile wireless device that issued the connection request from accessing the base station wireless device.

Next, an embodiment in which communication by the DS / SS (direct spreading code spectrum modulation) system is used will be described with reference to FIGS. In the following description, the base stations are the base station radios 4-1 to 4-1 in FIG.
4-3, etc., and the mobile station indicates the terminal device 5 of FIG. 8 to 23, the base station is denoted by B.
S, the mobile station may be illustrated and described as an MS.

FIG. 8 shows a system configuration diagram according to the first aspect of the present invention. In FIG. 8, a transmission signal 10 composed of a packet from the base station 4 is a DS signal using a base station identification number.
/ SS. Each base station has its own base station identification number as a spreading code. The mobile stations 1 and 2 (5-1 and 5-2) hold the base station identification numbers of the respective base stations, search the transmission signal 10 for the base station identification numbers, and change the base station identification numbers. By performing despreading using this, transmission data addressed to the own station is obtained from the base station 4.

The transmission data is packet-multiplexed according to the above-mentioned IPMA method, whereby multiple access is made. In the illustrated example, the mobile station 5-1 transmits M
The packet indicated by S1 is obtained, and the mobile station 5-2 transmits the transmission signal 10
From the packet indicated by MS2. Also, the mobile station 5-1
Modulates the signal using the base station identification number of the registered base station and transmits the MS1 packet, and the mobile station 5-2 modulates the signal using the base station identification number of the registered base station. Then, the packet of the MS 2 is transmitted. At this time, the mobile station
Using a frequency band different from the frequency used by the base station, simplex half-duplex communication or duplex communication is performed.

As a result, transmission from the mobile station using a code fixed to the base station identification number can improve communication efficiency because there is no control procedure for arbitrarily generating a spreading code. .

In the transmission of the mobile station, since the transmission is a burst transmission and the location of the transmission is not fixed,
The problem of interference from other stations is more pronounced than the base station. Therefore, even if the bandwidth is the same as that of the base station, the effect of interference may be reduced by increasing the process gain (by lowering the data transmission rate). Since communication via the Internet is generally large in the amount received by the mobile station, the effect on the system by this method does not become a significant problem.

In digital radio data communication, by increasing the transmission rate, the influence of multipath fading, particularly, selective fading due to multi-wave delay increases, and the communication quality deteriorates. By using spread spectrum communication, the effect of this selective fading can be improved, and high-speed communication becomes possible.

There is also a method of performing multiple access by code-multiplexing a transmission signal of a base station. However, since mutual interference occurs, high-precision power control for minimizing interference noise is required. However, since the power change in fading is large in practice, the data quality is improved to the extent that voice communication can be performed, but it is difficult to obtain the quality that allows data communication. In the present embodiment, high-speed communication and multiple access are simultaneously realized by performing multiple access by the IPMA.

FIG. 9 shows an embodiment according to the second, third and fourth aspects. The mobile station performs communication by searching for a base station that can be optimally received during movement. Actually, as shown in the drawing, there is a range in which radio waves reach from a plurality of base stations (A), (B), and (C). Therefore, it is necessary to separate each base station at the intersection of each area. For that purpose, it is necessary for the mobile station to obtain a certain process gain or more.

As shown in FIG. 9, in an area configuration where three radio waves reach, by treating the other two as interference waves, each base station signal can be separated with good quality. The overlay number Nr when the other channel is an interference wave is the ratio Eb / No of the information rate R, the transmission band W, the energy Eb per signal bit and the noise power spectral density No including interference of other channels. , The minimum number is obtained by the following equation (1). Nr = (W / R) / (Eb / No) (1) ────

If the allowable bit error rate is set, the communication quality (BER) can be determined from the error rate characteristics of the modulation method by using Eb / No.
Is obtained. Therefore, the information speed and the transmission band are required by setting the communication quality that can separate the respective base stations. In the case of the direct spreading modulation scheme, the ratio of the transmission band when the information rate is the symbol rate, that is, the spreading factor has the same value as the process gain.

In the equation (1), W = 1.25 MH
Assuming that z and Eb / No = 7 dB, R = 1.25 / 14 = 89.3 kps to separate the three base stations.

As described above, by setting the process gain based on the number of installed base stations and the number of overlays, it is possible to suppress signal deterioration due to mutual interference. Therefore, it is possible to perform multiple access using IPMA by repeating the same frequency. , And high-speed data transfer.

Conventionally, in such an arrangement of base stations, a hexa-type model is used when an omnidirectional antenna is used in order to maximize the distance between base stations without interrupting the system service area. This is for minimizing the intersecting area. On the other hand, IPMA
In the system, the area where each base station intersects is the most efficient area, so that the conventional cell-type zone configuration cannot be used.

Since the above-described IPMA is a packet reservation type communication, it is possible to distribute traffic information or analyze the traffic information by the mobile station. Based on this traffic information, the state of the line being used can be grasped. If the throughput is low, another line is searched and a high-throughput line is appropriately selected, so that the throughput is lowered. This makes it possible to avoid delays and distribute traffic, thereby realizing a high-quality and stable wireless data communication network.

Conventionally, in FDMA, TDMA, and CDMA, the frequency in FDMA, the time division timing in TDMA, and the code multiplexing in CDMA are as follows.
In order to avoid interference at the own station and interference with other stations, most communication methods are connection-based. These control the line connection at the base station. in this case,
It is not suitable for the best-effort packet data communication using the Internet protocol because the line connection control by the base station becomes complicated and the line connection management is difficult to maintain for a long time.

In this system using the IPMA and the wireless server, the mobile station selects a suitable connection base station as necessary, so that data communication with the mobile body can be performed by simple route control using the Internet protocol. .

As described above, the area in which the mobile station can spontaneously select a line is the area where each area intersects in FIG. At this time, the most options are where the three areas where the mobile stations are located intersect. It is easily conceivable that the more options there are, the higher the probability that an appropriate line can be selected. As described above, the present embodiment is a method that can effectively use the intersection area of each base station.

Further, the conventional FDMA, TDMA, CD
In a base station such as an MA that can centrally manage connected users, it can be said that the use density can be increased in the service area of the base station. A simple design is required. This is because, in particular, when communication with a moving object is performed from a ground base station, the state of the area changes due to a large change in radio wave propagation characteristics due to the terrain and the building. In reality, work has been performed to arrange base stations to optimize power and antenna directivity. Furthermore, there are cases where the environment that satisfies the conditions for arranging the antenna at a convenient position in the area configuration is not so many due to the beauty of the antenna, the network infrastructure for high-speed data communication such as ISDN, and the nature of the building (hospital or the like).

The base station according to the present embodiment can solve the above problems by effectively utilizing the intersections of the areas and by reducing the load of network management of the base stations and distributing them. I have. As will be described later, effects can be obtained in network configuration, cost, and reliability.

[0086] In this embodiment, the intersection of the above areas is called a digital overlay. This is because it is used as a means for avoiding problems such as traffic and delay in data communication using the Internet protocol and improving service quality. A base station that performs IPMA and is connected to a wireless server and that is used in the network configuration described above or described below is referred to as a distributed base station.

FIGS. 10 and 11 show an embodiment according to the fifth aspect. FIG. 10 shows an increase in transmission speed due to multi-user reception. The mobile station MS selects a base station having the strongest power (less interference) from the base stations BS (A), (B), and (C), and registers and communicates with the selected base station. The base stations communicate with each other via the DS /
They are separated by SS modulation. Therefore, the signal transmission rate is lower than the band in order to increase the spreading ratio within a range where the base station can be separated. Therefore, in order to cope with high-speed data transmission, the speed of data transmission can be increased by using multi-user reception in which reception is performed from adjacent communicable base stations.

The multi-user reception according to this method uses a CD.
Since the number of multiplexes from the base station is not increased unlike the multi-user reception by the MA system, the interference amount does not change, so that other stations are not affected. Therefore, power control for adjusting the amount of interference when the number of multiplexes is increased is not necessary,
Further, since control procedures such as code assignment for reducing cross-correlation can be omitted, communication efficiency is improved and the load on the base station apparatus is reduced.

FIG. 11 shows digital overlay and multi-user reception. The signal directly spread by the base station identification number repeatedly uses the same frequency band.
FIG. 11 shows a state of being separated by an identification number. In transmission signals from the base stations BS (A), (B), and (C) distributed on concentric circles, the overlapping portion is an area where multi-user reception is possible. In the mobile station MS1, the RF signal received by the antenna is A / D converted, and then received and collected by the receivers 1, 2, and 3 corresponding to each base station.
Get received data.

In the case of FIG. 11, the mobile station MS
1, assuming that the communication speed to MS2 and MS3 is 38.4 kbps, MS1: 38.4 kbps × 3 = 11.5 kbps MS2: 38.4 kbps × 2 = 76.8 kbps MS3: 38.4 kbps can be obtained.

In order to support the high-speed data transmission mode, it is necessary to increase the overlay portion. Since it is possible to multiplex the number of overlays up to the interference limit, by performing multi-user reception using the maximum number of overlays,
The frequency utilization efficiency is highest. Further, by using the DS / SS method, multi-user reception can be performed by signal processing, that is, software processing. This means that the system can be expanded by installing a new base station and improving the software of the mobile station, and has the function and cost advantage that hardware can be added without requiring new functions. .

FIG. 12 shows a mobile station MS1 according to claim 6.
2 shows how data transmission of a transmission signal is speeded up by multi-transmission from the base station (A) to the base station (B) (C). The mobile station MS1
For example, input data of 38.4 kbps × 3 is distributed to each base station (A), (B), and (C) and corresponding modulator,
After performing DS / SS and multiplexing using the spreading code of each base station, the base station performs D / A conversion, modulates an RF signal, and transmits the modulated signal from an antenna. As described above, high-speed communication from the mobile station can be realized by performing the multi-transmission in which the signal modulated by the spread code of each base station is multiplexed and transmitted.

FIG. 13 shows an embodiment according to claim 7 and shows how interference of a mobile station is removed. DS / SS
By using the communication method, interference cancellation can be performed using an adaptive filter or the like. The mobile station communicates with the best receiving base station, but as a countermeasure for cases where the traffic of the base station is dense and data transfer is hindered, a method of removing interference can be considered. In this case, unlike the conventional coded multiple access method, the number of interferences is small, so that a definite value can be used instead of an estimation such as interference cancellation in the code multiplexing method, so that easy and accurate cancellation can be performed. It becomes possible. As a result, in the overlay portion, it is possible to select a zone independent of the power intensity, and the throughput is improved.

In the case of FIG. 13, in the mobile station MS1,
The signal from the base station (A) is strong, but the traffic is large and the throughput is low. Therefore, the signal of the base station (A) is removed, and the throughput is reduced by using the base station (B) or (C). I try to improve. That is, the mobile station is 1
While monitoring its throughput while communicating with two base stations,
When the throughput decreases, the base station of the own station is changed to communicate with the changed base station, and at the same time, the interference is removed by deleting the registration of the one base station and stopping the communication. I have to.

FIG. 14 illustrates multi-user reception and interference cancellation in the base station according to claim 8.
In the base station (B), the transmission signals of the mobile stations 1 and 3 communicating with the base stations (A) and (C) become interference noise. As described above, these interferences can be removed in DS / SS communication. Also, since multiplexing is performed by IPMA, the number of interference waves is small, and the code of the interference signal can be handled as a definite value. Also,
By removing these from each other, multi-user reception becomes possible, and it is conceivable to improve base station path diversity reception characteristics.

In FIG. 14, the base station (B) cancels the interference by the registered mobile stations of the surrounding base stations (A) and (C) based on the base station identification number, so that the base station (B) from the mobile station 2 can cancel the interference. ).

FIG. 15 shows a network configuration according to claim 9. For code multiple access that maximizes the capacity of one base station, in the DS / SS system using IPMA,
It is possible to change the interval between base stations by arranging the base stations according to the used capacity, the number of overlays, and the area.

As a result, in places such as urban areas where the number of users and demand for high-speed data are considered to be large, the area of the overlay is increased, and the number is further increased. In a place where the number of users is not so large, such as a residential area as shown by, the area and number of overlays are appropriately set.
Furthermore, when it is conceivable to use only vehicles that are almost moving, as in the case of roads between cities, organic stations such as arranging base stations so that they are not interrupted and configuring a zone with as few base stations as possible. Service area design becomes possible.

Thus, it is possible to provide a service with a minimum initial investment, to easily expand the system,
Advantages are obtained, such as easy service area design, easy management of base station equipment, and reduced system maintenance costs.

FIG. 16 shows a method for dividing high-speed data according to the tenth aspect. The high-speed data sent to the wireless server 3 is a base station BS (A) that can be received by the mobile station MS.
(B) and (C) respectively, IP_1,
It is divided and transmitted like IP_2 and IP_3. Mobile station M
S combines the data sent from each base station and returns it to high-speed data. The number of data that can be divided is the number of base stations that the mobile station can receive and the number of multi-user receivers of the mobile station.

Since the network load on the base station is reduced, system stability can be improved, and
Since high-speed response is possible, quality can be improved by eliminating the problem of data delay.

FIG. 17 shows a method for registering a mobile station according to claims 11 and 12. The mobile station MS1 is a base station BS
A base station with the least interference is selected from (A), (B) and (C) and registered (in the case of single-user reception). In the case of multi-user reception, as shown in the figure, it is possible to select a base station capable of high-quality reception based on the traveling direction of the mobile station and its state. This can be said to be a feature of the system in which the base station does not perform power control.

In the case shown, the base stations BS (A) and (B)
Since (C) does not perform power control and has a fixed output, the distance and moving direction of each mobile station MS from each base station BS (A) (B) (C) by a receiver corresponding to each base station. , A temporal change of the electric power is obtained. That is, the power increases as the mobile station approaches, and decreases as the mobile station moves away. By utilizing this change, it is possible to improve deterioration of signal quality during movement. In the illustrated example, high-quality data reception can be expected by registering the MS 1 with the BS (B). in this way,
The ability to adaptively select high quality communications in a mobile state improves system stability.

FIG. 18 shows a location registration and call control method according to claims 13 and 14. Performing the registration operation with each base station every time the mobile station moves between base stations performs communication other than data, and thus lowers the throughput. By registering information of neighboring base stations receivable via one base station, the number of registration operations can be reduced, so that efficiency can be improved.
Further, the number of calls to an area where no terminal exists can be reduced, so that the system throughput can be improved.

In FIG. 18, the wireless server:
If there is no call response from the last used base station, call from another. The mobile station MS1 to the wireless server
In S (B) and (C), it is notified that reception is possible. When the mobile station MS1 waits for reception at the notified base station, the mobile station MS1 does not perform the registration operation. As a result, the loss due to the registration operation can be reduced and the efficiency can be improved.

FIG. 19 shows a method for canceling base station interference and registering a base station identification signal according to claim 15. Since high-precision power control is not performed in the transmission of the mobile station, interference occurs in the base station due to the transmission signals of the peripheral base station and the mobile station located there. These interferences can be easily performed by using known codes as in the case of the above-described mobile station interference cancellation. At this time, as a method of making the base station identification number known, it is possible to notify from a connected wireless server, but it is also possible to detect and register an interference wave. This makes it possible to empirically remove interference from base stations connected to different unrelated servers under management, thereby facilitating system expansion and contributing to reduction in management and maintenance costs.

FIG. 20 shows the base station output, installation location, and transmission power control of the mobile station according to claim 16. Since the base stations are asynchronous and the channels are classified according to the base station identification number, by gradually changing the transmission power of the base station, the arrangement of distributed base stations corresponding to the number of users and the environment at the installation location Becomes possible.

An example is shown in FIG. In an environment where users are sparse, such as in the suburbs, installing a high-power base station improves the efficiency. Further, in the suburbs, it is often possible to arrange high-output devices in geographical locations that are advantageous for radio wave propagation. In urban areas and the like, since users are dense, it is desirable that the base station identification number can be repeatedly used at a very short distance. In addition, due to the restrictions on the place where large power can be handled and the problem of the environment of the antenna, a medium output device whose directivity or the like is manipulated becomes more efficient. Furthermore, when the antenna is arranged indoors or the like, low output becomes efficient in consideration of the problem of radio wave interference to peripheral devices, the influence on the human body, and the interference with the outdoors.

In such a case, if the mobile station performs transmission at a constant output, interference occurs in each area regardless of the base station, so that transmission power control is required. In such a case, power control by closed loop such as detecting the amount of interference is difficult to control during fading, and control communication for investigating interference is required between the mobile station and the base station. Communication loss. Such power control is required in the case of code multiplexing. When multiple access is performed by IPMA, simple control of an open loop is sufficient. However, when the power is changed at the location as described above, there is a difference in the transmission power as well as the relationship between the uniform propagation distance and the attenuation. Therefore, by outputting the downlink signal including the output power information, the required power is determined from the base station power and the received power and transmitted.

By using the output controlled by the base station output and the attenuation due to the propagation distance, the problem of interference can be solved.
The frequency reuse efficiency is also improved. Due to the cross-correlation relationship, in transmission from a mobile station, multiple transmissions are performed to base stations of the same power.

FIG. 21 shows a handover in the case where it is necessary to update the area during the movement according to claim 17. The base station identification number is used from several tens to several hundreds, depending on the type of the spreading code. In this case, searching for all of these at the time of zone switching requires a long search time, so handover may be difficult. When the existence of the peripheral base station is clear, these identification numbers are well known, so that the selection range is narrowed and the zone search in the hand-over can be performed at high speed.

By giving the registration information of the identification numbers of the surrounding base stations in the base station to the mobile station, such a handover becomes possible. As a result, when power is turned on,
A high-speed search becomes possible except for the search at the initial stage. Further, since the delay due to the handover can be eliminated, the stability and quality of the system can be improved.

In FIG. 21, information from base station BS (A) includes the identification numbers of the peripheral base stations. According to this, the choice of the identification number for performing the zone switching operation at the time of movement is reduced, so that the high-speed search can be performed.

FIG. 22 shows a handover using multi-user reception according to claim 18. When multi-reception is possible, by using another receiver in a standby state, communication is not interrupted by zone switching, and handover becomes possible. Thereby, the stability and quality of the system can be improved without causing a delay at the time of shutoff.

In FIG. 22, information from the base station (A) includes base station identification number notifications of the peripheral base stations (B) to (D). According to this, the search is performed using the idle receiver. After detection, switch to a good receiver.

FIG. 23 shows an embodiment in which narrow-band communication and wide-band communication are mixed. In the above-mentioned application (Japanese Patent Application Laid-Open No. Hei 11-139311), the reliability of data communication in a high-speed mobile unit can be improved due to the relationship between the symbol rate, the moving speed, and the carrier frequency.
A wireless network configuration based on narrowband modulation, which is the base of A, is proposed. According to this method, since a wide area can be serviced, the communication system is suitable for a high-speed moving body such as an automobile. However, because of the narrow-band communication, the transmission speed is low, and it has been difficult to perform large-capacity data communication.

With the widespread use of the Internet, networks are no longer configured by data communication, and large-capacity data such as images and music used by humans can be converted from small-capacity data such as the operating status of equipment and the position and speed of automobiles. Multimedia being mixed on the same network is rapidly progressing. In the wireless interface,
There is a demand for similar multimedia. However, in wireless data communication in a mobile object, it is difficult to handle the transmission speed at high speed due to the influence of multipath fading.

As a countermeasure against Macti-pass fading, secondary coding such as spectrum spreading and error correction (secondary refers to the use of coding unrelated to transmission data. Spreading code, necessary for correction In the case of large-capacity, high-speed transmission, the efficiency can be improved, but if low-speed, small-capacity data is handled by the same system, the secondary Energy due to efficient coding is wasted. When having the same service area, as the transmission speed increases, the secondary encoding increases. Considering this, it can be said that the air interface is appropriate to be selected for each application. In this case, it is difficult to mix networks due to the difference in the protocol of the air interface, and the above-described various data cannot be shared.

The IP of the protocol of the air interface is IP
By using the MA, it is possible to share the same except for the modulation method of the narrowband communication and the spread spectrum communication. Also, since the wireless server has the functions of a bridge and a router, it is possible to absorb the difference in transmission speed, and it is easy to mix narrowband communication base stations and wideband communication base stations on a network. Become. As a result, it is possible to stabilize multimedia services by wireless data communication on a network, to perform the services efficiently, and to minimize costs.

FIG. 23 shows a system in which the narrowband communication and the wideband communication are mixed. For information that is used by humans by the broadband base station, broadband communication by spectrum communication is performed to provide high-speed services. In addition, a narrow band base station provides a service to a small amount of information such as equipment and an automobile (ITS) by narrow band communication. In this way, simply by distributing base stations for broadband communication and narrowband communication, a system can be constructed without changing the network, and multimedia services by wireless data communication can be shared on the same network.

In addition to the physical line connection such as FDMA, TDMA, and CDMA, the air interface is different because a packet multiplexing method (IPMA) suitable for IP packets is used for the narrowband modulation method and the wideband modulation method. The same network or interface can be used from the base station to the Internet and the mobile station to the PC or PDA. Therefore, the service mode can be changed to high-speed data and low-speed data only by changing the base station or the mobile station.

Next, a computer-readable storage medium according to the present invention will be described. When the above operations in the base station, the mobile station, and the wireless server that constitute the wireless data communication system are controlled by the computer system, the storage medium storing the program to be executed by the CPU or the MPU is a computer-readable storage medium according to the present invention. Configure a storage medium.

As the storage medium, a magneto-optical disk,
An optical disk, a semiconductor memory, a magnetic recording medium, or the like can be used, and these may be configured and used in a ROM, a RAM, a CD-ROM, a floppy (registered trademark) disk, a memory card, or the like.

The storage medium is a fixed memory such as a volatile memory such as a RAM inside a computer system serving as a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. The one that holds the time program is also included.

The above program may be transmitted from a computer system in which the program is stored in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.
The transmission medium refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

The program may be for realizing a part of the above-mentioned functions. Furthermore, what can realize the above-described function in combination with a program already recorded in the computer system, that is, a so-called difference file (difference program) may be used.

[0127]

As described above, according to the first aspect of the present invention, for example, in a wireless communication system using a multiple access system (IPMA) as shown in FIG. Since spread spectrum modulation is used, the effect of selective fading can be improved, high-speed communication can be realized, and the above-mentioned problem (1) can be solved.

According to the second and fourth aspects of the present invention, the base station outputs a fixed power and uses a spreading ratio capable of separating adjacent base stations, thereby solving the above problems (2) and (3). can do.

According to the third aspect of the present invention, since the base station with which communication is performed is selected according to the throughput of the base station, the traffic of data communication can be dispersed, and the above problem (9) is achieved. Can be solved.

According to the fifth and sixth aspects of the present invention, the speed of communication is increased by multi-user reception by overlaying distributed base stations, and mobile station transmission is performed by multi-transmission. 1) (3) (4) (5) can be solved.

According to the seventh and eighth aspects of the present invention, since the mobile station performs interference cancellation and interference cancellation by multi-user reception, the problem (2) can be solved.

Further, according to the ninth aspect of the present invention, the base stations are arranged according to the user density and the high speed, and the number of over stations is increased to cope with the high speed and the high capacity. Therefore, the problems (6) and (7) can be solved.

Further, according to the tenth aspect of the present invention, since the high speed control is performed by the wireless server, the problems (1), (3), (4) and (5) can be solved.

According to the eleventh and twelfth aspects of the present invention,
Since the mobile station searches for a good base station in the reception state while moving and sequentially updates the registration destination, and because a multi-user function is used to select and register a base station that can obtain high quality, the mobile station The problems (2) to (5) can be solved.

According to the thirteenth aspect, the identification number of the receivable base station is notified via the registrable base station. Can be solved.

According to the fourteenth aspect, once,
When notifying a plurality of receivable base stations, even when moving to an area of a base station different from the registered base station, if the area is a previously registered base station, the registration will not be updated. Thus, the problems (2) and (5) can be solved.

According to the fifteenth aspect of the present invention, the base station has a function of removing interference based on the identification number information of the surrounding base station. In this case, the identification number of the surrounding base station is set by the server. Or the interference code is detected and recorded so as to cope with the situation appropriately.
(4) (6) (7) can be solved.

Further, according to the sixteenth aspect of the present invention, the base stations are made asynchronous, the output is made a fixed output of several stages depending on the place and environment, and each base station outputs its output power to each mobile station. The mobile station then communicates with the output and the output according to the amount of attenuation.
(4) (5) can be solved.

Further, according to the seventeenth and eighteenth aspects,
Based on the surrounding base station information notified from the base station, by handing over the base station search time, handover is performed, and in multi-user reception, since handover by selecting a receiver is performed, The problems (1) and (2) can be solved.

Further, according to the nineteenth aspect of the present invention, IPMA can be applied to a multiplexing system using high-speed mobile data communication in narrowband communication. Claim 1 can be considered to increase the data transfer speed at this time and add secondary modulation that goes up directly. In this way, the problems (1) to (8) can be solved by using a system in which the narrowband modulation system and the wideband modulation system are mixed.

According to the twentieth aspect, the transmission signal from the radio base station and the transmission signal from the mobile station are each transmitted on a single frequency channel. Communication by the method can be easily realized.

According to the twenty-first aspect of the present invention, a packet of a transmission signal from a radio base station includes destination information, and a subsequent packet includes information indicating a data length of data transmitted from the radio base station. Thereby, communication efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a sequence chart showing an operation of the wireless communication system.

FIG. 3 is a block diagram showing a configuration of a base station value device and a mobile radio device.

FIG. 4 is a configuration diagram showing a frame configuration of communication data.

FIG. 5 is a timing chart showing a communication timing between a mobile wireless device and a base station according to a connection request of the mobile wireless device.

FIG. 6 is a configuration diagram showing a conventional method of a data retransmission request and a method of an embodiment.

FIG. 7 is a timing chart showing responses of a plurality of mobile wireless devices.

FIG. 8 is a configuration diagram of a wireless communication system using DS / SS-IPMA.

FIG. 9 is a configuration diagram and a graph showing an area configuration and a spreading factor.

FIG. 10 is a block diagram showing data acceleration.

FIG. 11 is a configuration diagram showing digital overlay and multi-user reception high-speed data communication.

FIG. 12 is a configuration diagram illustrating mobile station speed-up multi-transmission.

FIG. 13 is a configuration diagram illustrating an interference cancellation method in a mobile station.

FIG. 14 is a configuration diagram showing interference cancellation between base stations and multi-user reception.

FIG. 15 is a network configuration diagram.

FIG. 16 is a configuration diagram showing high-speed data communication and IP packet division.

FIG. 17 is a configuration diagram showing a mobile station registration method.

FIG. 18 is a configuration diagram showing notification of receivable base station information and call control.

FIG. 19 is a configuration diagram showing a method of removing base station interference and registering surrounding base station identification numbers.

FIG. 20 is a configuration diagram illustrating a base station output power, an arrangement method, and mobile station transmission power control.

FIG. 21 is a configuration diagram illustrating handover in single-user reception.

FIG. 22 is a configuration diagram showing a handover in multi-user reception.

FIG. 23 is a network configuration diagram.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Host server 2 ... Network 3-n ... Wireless server 4-n ... Base station radio 5 ... Terminal 5a ... Mobile radio 5b ... Computer terminal R1 ... Receiving part R2 ... Decoder R3 ... RCCH analysis part R4 ... CCCH Analysis unit R5 UPCH analysis unit R6 ID check unit R7 Retransmission control unit R8 RCCH generation unit R9 CCCH generation unit R10 UPCH generation unit R11 Encoder R12 Transmission unit R13 Intermittent standby unit R14 Area search Part 10: Transmission signal BS: Base station MS: Mobile station

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 13/00 317 (72) Inventor Takao Yokoshima 1-8-10 Kichijoji Honmachi, Musashino City, Tokyo Mitsubishi Materials Stock Mobile Business Development Center (72) Inventor Kazuyoshi Taza 1-8-10 Kichijoji Honcho, Musashino City, Tokyo Mitsubishi Materials Corporation Mobile Business Development Center (72) Kenzo Nakamura Musashino City, Tokyo 1-8-10 Kichijoji Honcho Mitsubishi Materials Corporation Mobile Business Development Center (72) Inventor Hiroyuki Unoki 1-8-10 Kichijoji Honmachi Musashino City, Tokyo Mitsubishi Materials Corporation Mobile Business Development Center F Terms (reference) 5K022 AA10 DD13 EE01 5K033 AA01 AA05 CB01 CC01 DA01 DA19 DB17 DB18 EA02 5K034 AA01 AA06 BB06 DD02 EE03 FF10 FF13 HH01 HH02 5K067 BB02 BB21 CC08 CC10 DD19 EE02 EE10 EE16 EE24 GG01 GG11 HH24 JJ35 JJ37 JJ38 JJ73 JJ74

Claims (72)

[Claims] Claims: 1. At least one of a plurality of network devices arranged on a network
A wireless data communication system based on a multiple access method, comprising: one wireless server, a plurality of base stations communicating with one wireless server, and at least one mobile station communicating wirelessly with the plurality of base stations; A wireless data communication system for performing communication between stations using a signal modulated by a direct spread spectrum modulation method. 2. Each of the base stations performs direct spreading modulation using a base station identification number as a spreading code, outputs a fixed power, and sets the spreading ratio so that adjacent base stations can be separated. The wireless data communication system according to claim 1, wherein: 3. The mobile station receives using a base station identification number having the least interference and high communication quality, and transmission from the mobile station is performed by using a code unique to the base station identification number as a spreading code. 3. The wireless data communication system according to claim 2, wherein the communication is performed by performing direct spreading modulation using the communication. 4. The radio station according to claim 2, wherein the mobile station selects a base station that performs communication in accordance with the throughput of each base station in an area where the communication ranges of the plurality of base stations intersect. Data communication system. 5. The mobile station according to claim 1, wherein the communication speed is increased by performing multi-user reception by digital overlay for receiving from a plurality of base stations in an area where the communication range of the plurality of base stations intersects. 3. The wireless data communication system according to claim 2, wherein: 6. The wireless data communication according to claim 2, wherein the mobile station speeds up communication by performing multi-transmission for transmitting a signal obtained by multiplexing signals to a plurality of base stations. system. 7. The mobile station has interference canceling means, which communicates with one base station and, when its throughput is reduced, changes its own registered base station and changes the registered base station. The wireless data communication system according to claim 3, wherein the wireless data communication system communicates with a base station. 8. The base station according to claim 7, wherein said base station has multi-user receiving means and / or interference removing means using a spreading code unique to said base station identification number.
A wireless data communication system as described. 9. The wireless data communication system according to claim 2, wherein said base station is arranged according to the number of users and a demand for speeding up communication. 10. The wireless data communication system according to claim 5, wherein control for speeding up by said multi-user reception is performed by said wireless server. 11. The wireless data communication system according to claim 9, wherein said mobile station searches for a base station capable of performing communication with less interference while moving, and sequentially updates the registration destination base station. 12. The mobile station, when performing the multi-user reception, detects a moving state of the mobile station with respect to a position of the base station from outputs of a plurality of receivers in the mobile station, and determines a probability that communication with high quality can be performed. The wireless data communication system according to claim 11, wherein a high base station is selected and registered. 13. When the mobile station registers with a base station,
The wireless data according to claim 5, wherein the mobile station that performs high-speed reception notifies the wireless server of a base station identification number of a receivable base station via a registered base station or a receivable base station. Communications system. 14. When a mobile station moves within a plurality of receivable areas once registered via a certain base station, even if a base station capable of performing the best communication is detected, the registration is not updated. 14. The wireless data communication system according to claim 13, wherein: 15. The base station has interference removing means based on base station identification number information of a surrounding base station, wherein the base station identification number of the surrounding base station is set from a wireless server or an interference code is detected. 9. The wireless data communication system according to claim 8, wherein the communication is performed by recording. 16. Each of the base stations is asynchronous, the output of each base station is fixed at a plurality of stages according to the location, each base station notifies its output power to a mobile station, and the mobile station outputs 3. The wireless data communication system according to claim 2, wherein communication is performed with an output in accordance with the amount of attenuation and multi-user transmission is performed using a base station having the same power. 17. The wireless data communication according to claim 9, wherein said mobile station performs a handover by shortening a base station search time based on surrounding base station information notified from said base station. system. 18. The wireless data communication system according to claim 5, wherein the mobile station performs a handover by selecting a receiver in the multi-user reception. 19. The narrow band modulation method and the wide band modulation method are mixed by performing data communication of the narrow band communication by applying the multiple access method, and the wireless server performs the narrow band modulation method and the wide band modulation method. 2. The wireless data communication system according to claim 1, wherein the wireless data communication system is connectable to communication by the wireless communication device. 20. The wireless data communication system according to claim 1, wherein the transmission signal from the base station and the transmission signal from the mobile station are each transmitted by a single frequency channel. 21. A transmission signal from the base station is composed of a plurality of packets, a first packet including destination information, and a second packet subsequent to the first packet further following the first packet. 2. The wireless data communication system according to claim 1, further comprising information indicating a data length of data transmitted from said base station. 22. At least one wireless server disposed on a network, a plurality of base stations wirelessly communicating with the one wireless server, and at least one wireless communication with the plurality of base stations.
A base station in a wireless data communication system based on a multiple access method, comprising: a mobile station; and a communication means for performing communication with the mobile station using a signal modulated by a direct spread spectrum modulation method. Base station that features. 23. The communication means performs direct spreading modulation using a base station identification number as a spreading code, outputs a signal with a fixed power, and sets the spreading ratio so that adjacent base stations can be separated. The base station according to claim 22, characterized in that: 24. The base station according to claim 23, further comprising multi-user receiving means and / or interference removing means using a spreading code unique to the base station identification number. 25. An interference removing unit based on base station identification number information of a surrounding base station, wherein the base station identification number of the surrounding base station is set from the wireless server, or the interference code is detected and recorded. 24. The base station according to claim 23, wherein: 26. The base station according to claim 23, wherein the output power of the communication means is fixed in a plurality of stages according to the location, and a notifying means for notifying the mobile station of the output power is provided. . 27. The base station according to claim 22, wherein said communication means performs transmission and reception with said mobile station using a single frequency channel. 28. The transmission signal comprises a plurality of packets, a first packet of which includes destination information, and a second packet subsequent to the first packet further includes data to be transmitted subsequently. The base station according to claim 27, further comprising information indicating a data length of the base station. 29. At least one wireless server provided on a network, a plurality of base stations wirelessly communicating with the one wireless server, and at least one wireless communication with the plurality of base stations.
The mobile station in a wireless data communication system based on a multiple access method, comprising: a mobile station; and a communication means for performing communication with the base station using a signal modulated by a direct spread spectrum modulation method. Mobile station to be characterized. 30. The communication unit receives by using a base station identification number having the lowest interference and the highest communication quality.
30. The mobile station according to claim 29, wherein a communication is performed by performing direct spreading modulation using a code unique to a base station identification number as a spreading code. 31. The mobile station according to claim 29, further comprising a selection unit that selects a base station with which communication is performed in accordance with the throughput of each base station in an area where the communication ranges of a plurality of base stations intersect. Bureau. 32. The communication device according to claim 23, wherein the communication means speeds up communication by performing multi-user reception using a digital overlay for receiving from a plurality of base stations in an area where a communication range of the plurality of base stations intersects. 30. The mobile station according to claim 29. 33. The mobile station according to claim 29, wherein said communication means speeds up communication by performing multi-transmission for transmitting a signal obtained by multiplexing signals to a plurality of base stations. 34. An interference canceling means for communicating with one base station and, when its throughput is reduced, changing its registered base station and communicating with the changed base station. Item 31. The mobile station according to Item 31. 35. The mobile station according to claim 32, wherein said communication means searches for a base station capable of performing communication with less interference while moving, and sequentially updates the registration destination base station. 36. When performing the multi-user reception, the communication means detects a movement state of the own station with respect to the position of the base station from outputs of a plurality of receivers in the mobile station, and determines a probability that communication with high quality can be performed. The mobile station according to claim 32, wherein a high base station is selected and registered. 37. When high-speed reception is performed when the own station registers with the base station, the base station identification number of a receivable base station is set to the radio base station via the registration destination base station or the receivable base station. 33. The mobile station according to claim 32, further comprising a notification unit that notifies the server. 38. When moving through a plurality of receivable areas once registered via a certain base station, registration is not updated even if a base station capable of performing best communication is detected. A mobile station according to claim 37. 39. The output power of each base station is fixed in a plurality of stages according to the location, and the communication means performs communication with an output according to the output power and the amount of attenuation notified from each base station, and 30. The mobile station according to claim 29, wherein multi-user transmission is performed using a power base station. 40. The mobile station according to claim 35, wherein handover is performed by shortening a base station search time based on surrounding base station information notified from the base station. 41. The mobile station according to claim 32, wherein a handover is performed by selecting a receiver in the multi-user reception. 42. The mobile station according to claim 29, wherein said communication means performs transmission and reception with said base station through a single frequency channel. 43. A received signal from the base station includes a plurality of packets, a first packet of which includes destination information, and a second packet subsequent to the first packet further includes a subsequent packet. 30. The mobile station according to claim 29, further comprising information indicating a data length of data transmitted from the base station. 44. At least one wireless server disposed on a network, a plurality of base stations wirelessly communicating with the one wireless server, and at least one wireless base station communicating with the plurality of base stations.
The wireless server in a wireless communication data system based on a multiple access system comprising a mobile station and performing communication using a signal modulated by a direct spread spectrum modulation method between the base station and the mobile station, A wireless server, further comprising control means for performing control when the mobile station performs high-speed reception by multi-user reception. 45. When the mobile station registers with a base station,
44. A receiving means for receiving a base station identification number of a receivable base station notified from a mobile station performing high-speed reception via a registered base station or a receivable base station. The wireless server as described. 46. The wireless server according to claim 41, further comprising setting means for setting base station identification numbers of surrounding base stations for said base station. 47. The wireless data communication system performs narrow-band communication and narrow-band modulation by performing the narrow-band communication and the wide-band modulation by performing the narrow-band communication by applying the multiple access. 46. The communication apparatus according to claim 45, wherein the apparatus is connectable to communication using a modulation method.
The wireless server as described. 48. A computer-readable storage medium storing a program for executing a communication process for performing communication with a mobile station using a signal modulated by a direct spread spectrum modulation method. 49. In the communication processing, direct spreading modulation is performed using a base station identification number as a spreading code, output is performed at a fixed power, and the spreading ratio is set so that adjacent base stations can be separated. 49. The computer readable storage medium according to claim 48. 50. The computer-readable storage medium according to claim 48, wherein a program for executing a multi-user reception process and / or an interference cancellation process based on the base station identification number is stored. 51. Performing interference cancellation based on base station identification number information of a surrounding base station, setting the base station identification number of the surrounding base station from a wireless server, or detecting an interference code;
49. A program for recording and executing a corresponding interference removal process by recording the program.
The computer-readable storage medium according to any one of the preceding claims. 52. A program for executing a fixing process for fixing output power by the communication process in a plurality of stages according to a location and a notification process for notifying the mobile station of the output power. 49. The computer-readable storage medium according to claim 48, wherein 53. The computer-readable storage medium according to claim 48, wherein said communication process performs transmission and reception with said mobile station using a single frequency channel. 54. A computer-readable storage medium storing a program for executing a communication process for performing communication with a base station using a signal modulated by a direct spread spectrum modulation method. 55. The communication process includes a reception process using a base station identification number having the least interference and a high communication quality, and a transmission process performing direct spreading modulation using a code unique to the base station identification number as a spreading code. 55. The computer-readable storage medium according to claim 54, wherein the storage medium executes processing. 56. A program for executing a selection process for selecting a base station with which communication is performed according to the throughput of each base station in an area where the communication ranges of a plurality of base stations intersect. 55. The computer readable storage medium of claim 54. 57. A program for executing a receiving process for speeding up communication by performing multi-user reception by digital overlay for receiving from a plurality of base stations in an area where communication ranges of a plurality of base stations intersect. The computer-readable storage medium according to claim 54, wherein the storage medium is stored. 58. A program for executing a transmission process for speeding up communication by performing multi-transmission for transmitting a signal obtained by multiplexing a signal to a plurality of base stations. 54. The computer-readable storage medium according to 54. 59. A program for communicating with one base station and executing an interference canceling process for changing a registered base station of the own station when the throughput is reduced and communicating with the changed base station is stored. 58. The computer readable storage medium according to claim 57, wherein: 60. A program according to claim 57, wherein a program for searching for a base station capable of performing communication with less interference during the movement of the mobile station and successively executing a process of updating the registered base station is stored. Computer readable storage medium. 61. In the case of performing the multi-user reception, a movement state of the own station with respect to the position of the base station is detected from outputs of a plurality of receivers in the mobile station, and a base station having a high probability of being able to perform high-quality communication is selected. 58. The computer-readable storage medium according to claim 57, wherein a program for executing a registration process for performing registration is stored. 62. When performing high-speed reception when the self-station registers with the base station, the base station identification number of a receivable base station is transmitted to the radio base station via the registration-destination base station or the receivable base station. 58. The computer-readable storage medium according to claim 57, storing a program for executing a notification process for notifying a server. 63. The above registration process does not update the registration when moving through a plurality of receivable areas once registered via a certain base station, even if a base station capable of performing best communication is detected. 63. The computer readable storage medium of claim 62. 64. The output power of each of the base stations is fixed at a plurality of stages according to the location, and communication is performed with an output according to the output power and the amount of attenuation notified from each base station, and a base station having the same power is transmitted. 6. A program for executing a transmission process for performing multi-user transmission by using the program.
7. The computer-readable storage medium according to claim 7. 65. A program for executing a handover process for performing a handover by shortening a base station search time based on surrounding base station information notified from the base station. Item 5
7. The computer-readable storage medium according to claim 7. 66. The computer-readable storage medium according to claim 57, wherein the receiving process performs a handover by selecting a receiver in multi-user reception. 67. The computer-readable storage medium according to claim 54, wherein said communication process communicates transmission and reception with said base station through a single frequency channel. 68. A computer-readable storage medium storing a program for executing control processing when a mobile station performs high-speed reception by multi-user reception. 69. When the mobile station registers with a base station,
A program for executing a reception process of receiving a base station identification number of a receivable base station notified from a registration base station or a receivable base station from a mobile station performing high-speed reception is stored. 70. The computer readable storage medium of claim 68. 70. A computer-readable storage medium according to claim 68, wherein a program for executing a setting process for setting base station identification numbers of surrounding base stations for said base station is stored. . 71. The computer-readable storage medium according to claim 68, wherein a program for executing processing for connecting to communication using a narrowband modulation method and a wideband modulation method in a wireless data communication system is stored. 72. A multiple access system comprising at least one wireless server provided on a network, a plurality of base stations communicating with one wireless server, and at least one mobile station communicating with a plurality of base stations. Wherein the plurality of base stations comprise a first base station that performs narrowband communication with the mobile station and a second base station that performs wideband communication with the mobile station; In the area where signals transmitted from the base stations intersect, a base station that performs communication according to the throughput of each base station is selected, and communication is performed with the selected first or second base station. Wireless communication system performing communication using a signal modulated by a first modulation scheme for wireless communication or a second modulation scheme for broadband communication.