JP4133428B2 - base station - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides a base using efficient radio access technology.To the stationIt is related.
[0002]
[Prior art]
In recent years, a plurality of license-free low-power wireless communication systems using the microwave band have been proposed and standardized, and IEEE 802.11b or ARIB (which uses the 2.4 GHz band or the IEEE 802.11b or 5 GHz band which actually uses the 2.4 GHz band). A wireless communication system using the Hi-SWAN standard, etc., has been developed.
[0003]
As an example of such a low-power radio communication system, a TDI (Time Division Multiple) used in the Hi-SWAN system including a base station 200 and mobile stations 201, 202, 203 as shown in FIG. Access) A communication system using a centralized control method is exemplified.
[0004]
FIG. 17 is a diagram illustrating an example of a configuration of a communication frame used for wireless communication between the base station 200 and the mobile stations 201, 202, and 203. The structure of communication data is basically composed of frames divided at certain intervals, and one frame 211 includes information for notifying the mobile station of the transmission channel and transmission / reception timing used by the base station for transmission / reception. It is divided into a control information phase 212, a downlink phase 213 for transmitting data from the base station to the mobile station, and an uplink phase 214 for transmitting data from the mobile station to the base station. Further, the control information phase 212 includes a preamble 215 for obtaining information such as frame synchronization, and a data payload (216-1 to 216-N) including information on a time domain for transmission / reception in the frame and frequency channel. ing.
[0005]
In this scheme, base station 200 transmits information necessary for communication control such as synchronization and modulation scheme to mobile stations 201, 202, and 203 in control information phase 212, and the mobile station receives control information. It acquires information related to communication control such as its own communication time zone, and transmits and receives data.
[0006]
Such a wireless communication system is installed in a station or a place where many people gather, such as fast food, and is used as an Internet connection point called “hot spot”. In this hot spot, as shown in FIG. 18, a user carries a laptop computer or a portable terminal (PDA) having a function of connecting to a wireless LAN (Local Area Network), so that it can be used in a home or workplace. You can use the Internet not only in public places.
[0007]
In addition, as a means for exchanging information using a personal computer at home or using a mobile phone terminal on the go, electronic mail is widely used.
[0008]
[Problems to be solved by the invention]
However, in the low-power wireless communication system as described above, the number of channels is limited by the Radio Law, and a large number of channels that can transmit broadband content cannot be secured. For example, in the Hi-SWAN system, the number of usable channels is 4 channels in the 20 MHz band. When a large number of mobile stations (mobile terminals, etc.) try to connect to a hot spot using the IEEE802.11a or Hi-SWAN system at the same time, the data transmission rate per mobile station decreases or the network Problems such as inability to connect will occur.
[0009]
That is, in a TDMA wireless communication system such as the Hi-SWAN system, the data transmission period per frame is determined. Therefore, as the number of users trying to access the wireless communication system increases, the number of users increases. The bandwidth (time) that can be used will naturally decrease, leading to a decrease in communication speed. Further, when the necessary minimum bandwidth cannot be secured, the user may be denied access to maintain the performance of the wireless communication system.
[0010]
A prominent example is that a user who receives video distribution at a hot spot and wants to view the video can see that the network cannot always be connected or the transmission speed is low and real-time distribution is not possible. As a result, the service will be degraded, which is not preferable for hot spot users.
[0011]
  Therefore, an object of the present invention is to provide a base where a user of a wireless communication system such as a hot spot can always access the wireless communication system in a designated time zone.StationIt is to provide.
[0012]
[Means for Solving the Problems]
  The present invention provides communication time to a mobile station in response to a communication frame allocation request from the mobile station.as well asA base station in a wireless communication system that assigns a communication frame by designating a communication channel, and more than a certain time before a desired communication start time,Reservation request time zoneSpecifiedFrom the mobile stationFor identifying a communication frame allocation request as a communication reservation requestAnd means for notifying the mobile station whether or not the communication frame can be allocated;With
  In response to the communication reservation request, a communication frame is allocated with priority over communication frame allocation requests other than the communication reservation request.The time slot for the downlink phase communication frame allocation is greater than the time frame for the uplink phase communication frame allocation.It is characterized by that.
  Here, the notification means to the mobile station notifies a base station of another accessible wireless communication system.
[0013]
  Furthermore,Wireless communication means for wirelessly communicating with a mobile station, and wired communication means for performing wired communication with a mobile station,The communication reservation requestWireless or wiredReceive usingRukoAnd features.
  Here, the communication reservation request is provided by e-mail or includes the reserved communication frame with the MAC address and ESS-ID information of the mobile station using the reserved communication frame included in the communication reservation request. A means for identifying a mobile station is provided.
[0014]
In addition, when the communication request time zone of the mobile station overlaps with a communication request time zone already notified from another mobile station, the communication frame allocation is further performed by allocating the communication frame to the mobile station. When the communication frame is available, a communication frame is allocated to the mobile station, and when the communication frame is insufficient, the communication frame is not allocated to the mobile station.
[0020]
  By the above method, when a user wants to use a wireless communication system such as a hotspot at a time specified by the user, the user can always access the wireless communication system and has a communication band according to the purpose of the user. Secure baseStationIt becomes possible to provide.
[0021]
Further, the base station notifies the mobile station of the available time zone or a base station of another accessible wireless communication system when there is no available communication time zone. However, it becomes possible to shift the access time or access another wireless communication system.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In this specification, a station that transmits a control signal for controlling a wireless communication system is referred to as a base station. A base station may also be called an access point, a polling master, a hub station, or a control station. On the other hand, each device that performs communication is referred to as a mobile station. A mobile station may be referred to as a terminal or a station, for example. A notebook PC, PDA, or the like also functions as a mobile station if it has a wireless communication system.
[0023]
Furthermore, the “time zone” used in the description of the present invention indicates a relatively long period of time, for example, 1 hour from 9 o'clock to 10 o'clock. The time domain used by the same kind of data (for example, control information, transmission data to the mobile station 11) when a communication frame (for example, 2 ms) is time-divided is shown.
[0024]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0025]
FIG. 1 is a diagram showing an example of the configuration of a base station, a mobile station, and a communication time reservation system according to the present invention.
[0026]
The communication time reservation system of the present invention comprises communication devices (media server 2, TV (television) receiver, personal computer 4, mobile phone 5, wireless communication systems 10, 20) each having an Internet access function. It is possible to send and receive e-mails to and from each other. Furthermore, using a mobile station scheduled to access the base station as a communication device, the mobile station itself can access the Internet 1 to send and receive electronic mail.
[0027]
The media server 2 stores a DVD (Digital Versatile Disk), streaming video, etc. in a storage device such as an HDD (Hard Disk Drive), and in response to a request from another communication device such as a personal computer 4 connected to the Internet 1, It is a device that distributes arbitrary video.
[0028]
The wireless communication system 10 is a TDMA (time division multiple access method) centralized control wireless communication system including a base station 19 and mobile stations 11 to 16. That is, the base station 19 concentrates control of transmission / reception timings of the mobile stations 11 to 16 and frequency channels to be used. The radio communication system 20 is a TDMA (Time Division Multiple Access) centralized control radio communication system including a base station 25 and a mobile station 21, and performs communication in the same manner as the radio communication system 10. The wireless communication systems 10 and 20 use the above-mentioned 5.16 GHz to 5.24 GHz band frequencies, and perform communication using one of the four transmission channels at a frequency interval of 20 MHz. It is.
[0029]
FIG. 2 is a diagram showing an example of a block configuration of a base station constituting the communication time reservation system of the present invention.
[0030]
The base stations 19 and 25 include a transmission / reception antenna 29a, a wireless communication device 30a, an e-mail processing device 50a, an input / output interface device 51a, a data processing device 54a, and a system control device 55a.
[0031]
Next, the operation of each functional block when the base station transmits data to the mobile station will be described. Data such as images or sounds sent via a media such as a DVD or the Internet 1 is input to the data processing device 54a via the input / output interface device 51a. Next, the data input to the data processing device 54a is subjected to data processing such as data format conversion and compression as necessary, modulated by the wireless communication device 30a, and transmitted as a wireless signal by the transmission / reception antenna 29a. Is done.
[0032]
Next, the operation of each functional block when the base station receives data from the mobile station will be described. The radio signal input from the transmission / reception antenna 29a is demodulated by the radio communication device 30a and input to the data processing device 54a. The data input to the data processing device 54a is subjected to data processing such as data format conversion or expansion as necessary. Thereafter, the data signal subjected to the data processing can be sent to a desired communication partner via the Internet 1 via the input / output interface device 51a as necessary.
[0033]
The electronic mail processing device 50a processes a mail received via the Internet 1, recognizes a reservation time of a mobile station to be connected to the base station, and transfers it to the system control device 55a. Further, the electronic mail processing device 50a has a function of transmitting information such as reservation approval / rejection on an electronic mail to a mobile station to be connected to the base station based on the determination of the system control device 55a.
[0034]
Furthermore, the system control device 55a plays a role of system control over the entire base station, such as control over individual functional blocks, data flow monitoring, and communication time reservation management.
[0035]
FIG. 3 is a diagram showing an example of a block configuration of a mobile station constituting the communication time reservation system of the present invention.
[0036]
The mobile stations 11 to 16 and 21 are configured by a transmission / reception antenna 29b, a wireless communication device 30b, an e-mail processing device 50b, an input / output interface device 51b, a display device 52b, an input device 53b, a data processing device 54b, and a system control device 55b. Has been.
[0037]
Next, the operation of each functional block when the mobile station performs data transmission will be described. Data from the Internet 1 such as images or control information input from an input device 53b such as a keyboard or a touch panel or video media is input to the input / output interface device 51b. Data such as images and documents input to the input device 53b or data acquired via the Internet 1 is input to the data processing device 54b, and the data processing device 54b compresses the data and converts the data format as necessary. The data processed by the data processing device 54b that performs data processing such as the above is modulated by the wireless communication device 30b and transmitted as a wireless signal by the transmission / reception antenna 29b.
[0038]
Next, the operation of each functional block when the mobile station performs data reception will be described. The radio signal input from the transmission / reception antenna 29b is demodulated by the radio communication device 30b and input to the data processing device 54b. Data input to the data processing device 54b is subjected to data processing such as data expansion or data format conversion as necessary. The data signal subjected to the data processing is sent to another mobile station via the Internet 1 via the input / output interface device 51b as necessary, or displayed on the display device 52 such as a liquid crystal display. Is also possible.
[0039]
FIG. 4 is a block diagram showing an example of the configuration of the wireless communication apparatus of the present invention.
[0040]
The block configurations of the radio communication device 30a provided in the base stations 19 and 25 and the radio communication device 30b provided in the mobile stations 11 to 16 and 21 are as shown in FIG. 4, and both have the same configuration. . However, some functions of the communication control unit 31 differ depending on the transmission / reception control method between the base station and the mobile station. The difference in functions related to the control between the base station and the mobile station is mainly that only the base stations 19 and 25 have a transmission channel assignment function, a time domain assignment function in the channel, and a function for reporting them. Is a point.
[0041]
Next, the operation of the functional block of the base station or mobile station will be described. The reception signal input from the transmission / reception antenna 29 is selected on the receiving side by the antenna duplexer 32, and the RF / IF receiver 33 amplifies the received signal and converts the frequency to the intermediate frequency (IF) band. Is called. The received signal converted to an intermediate frequency (for example, a center frequency of 20 MHz) is converted from an analog format to a digital format signal by an A / D converter 35, and then the received signal is demodulated by a demodulator 36, and an external interface, etc. The data is sent as data to the data processing device or the like via the bus control unit 38 having the above function.
[0042]
The demodulator 36 has a function of measuring the error rate of the received data, and can measure the BER (Bit Error Rate), PER (Packet Error Rate), and the like of the received signal. .
[0043]
Further, a part of the received signal is transmitted from the RF / IF receiver 33 to the signal strength detector 34 for detecting the signal strength, and the signal strength is detected. The detected signal strength data is sent to the communication control unit 31, and the loss of the RF / IF receiver 33 is corrected, and the received signal strength is determined at the antenna end (transmission / reception antenna 29). The
[0044]
Further, the data (Data) output from the data processing device or the like is modulated via the bus control unit 38 by adding control information and converting it into a transmission signal format (packet format, etc.) used for wireless communication. This is done in the vessel 39. The transmission rate in each segment, which will be described later, is changed by receiving a command from the communication control unit 31 and the modulator 39 changing its own modulation method.
[0045]
Next, the transmission signal is converted from a digital format to an analog format signal by the D / A converter 40, and the RF / IF transmitter 41 performs amplification of the transmission signal and frequency conversion to a high frequency (RF) signal. The signal is transmitted from the transmission / reception antenna 29 to the antenna via the antenna duplexer 32.
[0046]
The communication control unit 31 has a function of controlling the system of the base station or the mobile station as a whole, as well as a communication control function such as frequency channel recognition or allocation of the transmission rate and length of each segment (base station only) and each unit. It also has a function of controlling power supply to the device.
[0047]
FIG. 5 is a diagram illustrating an example of a configuration of a communication frame used in a radio communication system including a base station and a mobile station according to the present invention. The structure of the communication data of the present invention is basically composed of frames (71-1 to 71-3) divided every certain time, and one frame 71-1 is a frequency channel used for transmission / reception by the base station. And a control information phase 72 including information for informing the mobile station of transmission / reception timing, M downlink phases 73 for transmitting content (data) from the base station to the M mobile stations, and the mobile station To the uplink phase 74 for transmitting data to the base station. Further, the control information phase 72 includes a preamble 75 for obtaining information such as frame synchronization, and a data payload (76-1 to 76-M) including information on a time domain for transmission / reception within the frame and frequency channel. ing. In addition, the time domain of the control information phase 72, the downlink phase 73, and the uplink phase 74 in the frame can be appropriately changed according to the data communication capacity and the like.
[0048]
FIG. 6 shows a flowchart of the communication time zone reservation method in the communication time reservation system of the present invention when focusing attention mainly on the base station, and FIG. 7 shows the communication time zone in the communication time reservation system of the present invention. FIG. 2 shows a flowchart when the mobile station mainly focuses on the reservation method. A method for reserving a communication time zone between a base station and a mobile station constituting the communication reservation system of the present invention will be described mainly with reference to FIGS.
[0049]
As described in FIG. 3, the mobile station focused on in FIG. 7 has a function of wirelessly accessing the base station and a function of connecting to the Internet and reserving a communication time zone by e-mail. The flowchart in FIG. 7 describes a case where the mobile station itself accessing the base station reserves a communication time zone (communication frame).
[0050]
However, the communication time zone may be reserved from a terminal (such as the personal computer 4 or the mobile phone 5) other than the mobile station that is scheduled to access the base station.
[0051]
In step SB11 of FIG. 7, the mobile station that reserves the data transmission / reception time area (communication time area) sends at least an e-mail in which the time zone desired to be reserved and its own identification ID are written to the e-mail processing device 50b. Convert to a format compatible with the email transmission protocol. Next, the e-mail is transmitted to the e-mail notifying the reservation of the communication time period to the base station that desires the reservation by connecting to the Internet via the input / output interface device 51b.
[0052]
The e-mail includes an identification ID [MAC (Media Access Control) address for recognizing a mobile station recognized in advance by a base station and a time slot (reservation request time slot) in which the e-mail is desired to be reserved. Alternatively, even in a format that describes ESS-ID (Enhanced Service Set ID) etc.], a homepage where reservation information can be entered in the base station is accessed, and the reservation time and mobile station recognition on the WWW (World Wide Web) The ID may be input in a tag format and data on the Web may be transmitted.
[0053]
Next, in step SA11 in FIG. 6, the base station connected to the Internet receives the communication time zone reservation e-mail from the mobile station via the input / output interface device 51a, and the e-mail processing device 50b The mobile station recognition ID and reservation request time zone are recognized.
[0054]
Next, in step SA12, the system controller 55a of the base station confirms communication time zone allocation information related to its own communication system corresponding to the reservation request time zone transmitted from the mobile station.
[0055]
Next, in step SA13, the system controller 55a of the base station adds the communication time zone desired by the mobile station to the downlink phase 73 and the uplink phase 74 based on the confirmed reservation request time zone allocation information. To determine whether it can be assigned. If the reservation request time zone allocation is “possible”, the process proceeds to step SA15, and if the reservation request time zone allocation is “impossible”, the process proceeds to step SA14.
[0056]
If the system controller 55a of the base station determines that it is “impossible” to assign the reservation request time zone, the e-mail processing device of the system controller 55a “rejects” at least data transmission / reception. And an e-mail in which the communication system to which the base station belongs describes additional information such as a free time zone is transmitted to the mobile station via the Internet, returns to step SA11, and waits for the reception of the next e-mail. I do. (Step SA14)
[0057]
If the system controller 55a of the base station determines that it is “possible” to assign the reservation request time zone, the e-mail processing device “confirms” data transmission / reception and the assigned frequency channel Is sent to the mobile station via the Internet. (Step SA15)
[0058]
In the next step SA16, the base station changes the allocation of the downlink phase 73 and the uplink phase 74 in consideration of the reservation request time zone. On the other hand, in step SB12, the electronic mail processing device 50b of the mobile station processes the reply mail from the base station received via the Internet, confirms the reply content from the base station, and sends the reply content to the system control device 55b. introduce.
[0059]
In step SB13, the system controller 55b of the mobile station determines whether or not the data transmission / reception request (reservation request time zone) has been accepted by the base station, and at the same time displays the reply content of the mail on the display device 52b. Notify users. If the data transmission / reception request is “accepted” by the base station, the process proceeds to step SB16. If the data transmission request is “not accepted” by the base station, the process proceeds to step SB14.
[0060]
In step SB14, it is determined whether or not to change the reservation of the communication time period based on the vacant time period notified by the user.
[0061]
If the reservation is to be changed in step SB15, the process proceeds to step SB11, and the reservation request time zone is reserved again by e-mail, and the user gives up the reservation without matching the free time and the reservation time. If you do, it will end.
[0062]
In the next step SA17, the base station communicates with the mobile station based on the allocated reservation request time zone, and in step SB16, the mobile station determines based on the allocated reservation request time zone and the frequency channel. Communicate with the base station.
By the above method, it is possible to reserve a time zone during which the mobile station communicates with a desired base station.
[0063]
Next, specific examples of the communication time reservation system will be described as first to third embodiments with reference to FIGS. 8 to 10. Note that FIGS. 1 to 7 are also referred to as appropriate.
[0064]
(First embodiment)
FIG. 8 is a diagram showing an example of a reservation time of the communication time reservation system according to the first embodiment of the present invention, and FIG. 9 is a communication time reservation system according to the first embodiment of the present invention. FIG. 10 is a diagram showing an example of the time domain allocation of the base station before the reservation, and FIG. 10 is a diagram illustrating the time domain allocation of the base station after the reservation in the communication time reservation system according to the first embodiment of the present invention. It is the figure which showed an example of allocation.
[0065]
The user will explain a specific method in the case of reserving the communication time between the mobile station 16 and the base station 19 using the configuration of the communication time reservation system as shown in FIG.
[0066]
In this embodiment, the number of mobile stations that the base station 19 can communicate in the same time zone is limited to five mobile stations that can be connected at the same time in order to secure a minimum time area necessary for video distribution and the like is doing. Also, the downlink phase, which is usually used for applications with large communication capacity such as moving image distribution, is more often used for transmission of small-capacity data such as transmission of control information. In other words, using the method of assigning more time slots than the uplink phase is more efficient than the method of assigning the uplink and downlink phases equally, so the uplink and downlink phases are asymmetric. It has become.
[0067]
The user uses the e-mail transmission / reception function of the mobile station 16 that wishes to access the base station 19, and the communication time zone (reservation request time zone) for requesting the reservation and the recognition ID (for example, the MAC address “00 11 FF”). 00 00 01 ”, ESS-ID“ GROUP 1 ”, and usage time zone, October 31, 2002, 9:10 to 9:40) are transmitted to the base station 19 that wants to communicate. The base station 19 recognizes a number unique to the mobile station 16 based on the MAC address, and recognizes whether the mobile station can access the base station 19 based on the ESS-ID. The MAC address and ESS-ID are registered in advance, and the base station 19 can recognize them. In addition, for security enhancement, a WEP (Wired Equivalent Privacy) key may be set, and this WEP key may be transmitted in addition to the recognition ID.
[0068]
The base station 19 receives the electronic mail, recognizes the reservation request time zone and the recognition ID, and examines whether it is possible to assign the reservation request time zone of the mobile station 16. As shown in FIG. 8, in a time zone in which the mobile station 16 wishes to make a reservation, a maximum of three mobile stations 11, 12, and 13 have already made a communication time reservation.
[0069]
As shown in FIG. 9, at the start time (9:10) of the desired reservation time zone of the mobile station 16, three mobile stations are already assigned to the downlink phase and the uplink phase. As described above, since the maximum number of mobile stations that can be connected to the base station 19 at the same time is 5, it is possible to additionally connect up to a maximum of two to the blank areas 81-1 and 82-1. The base station 19 notifies the user by e-mail that the communication request time zone (data transmission / reception time zone) can be reserved. In this case, an e-mail is normally sent back to the e-mail address sent by the user to the base station 19, but if the user is inconvenient, the e-mail is used in advance when making a reservation for the communication request time zone. If the person designates a reply address, it is possible to reply to the designated address.
[0070]
As shown in FIG. 10, the base station 19 assigns a communication request time zone for the mobile station 16 to the time regions 85-2 and 85-3. In this way, the reservation of the communication time zone between the base station 19 and the mobile station 16 is completed.
[0071]
In addition, when there is an area where a mobile station communication frame by reservation as shown in the time areas 81-2 and 82-2 exists before the communication start time, a mobile station assignment request by normal radio According to the method, the base station 19 allocates a mobile station without reservation.
[0072]
In this specific example, the mobile station 16 itself transmits an e-mail to the base station 19 and reserves the communication time. However, other communication devices (for example, the personal computer 4 and the mobile phone 5) are described. The communication time may be reserved by using the e-mail transmission / reception function. In this case, by transmitting an e-mail from the other communication device to the mobile station 16 or by directly connecting to the mobile station 16 by wire or wirelessly and transmitting / receiving information such as a communication time zone. The same effect as when the mobile station 16 directly reserves the communication time with the base station 19 can be obtained.
[0073]
Further, when all the communication time reservations are completed by the other communication devices, the user may directly give a command to the mobile station 16 by operating the input device 53b, or the final communication time reservation result May be transmitted to the mobile station 16 as data. In the example of the first embodiment, the frequency channel used by the base station 19 is set to one channel for easy understanding. However, when there are two or more frequency channels that the base station 19 can use, it is used. The base station 19 examines the allocation of time frames for all possible frequency channels, designates usable frequency channels, and notifies the mobile station 16 of them.
[0074]
(Second Embodiment)
As described above, in the example of the first embodiment, the case where the base station 19 “acknowledges” the reservation request time zone of the mobile station 16 has been described. However, in the next example of the second embodiment, the reservation request time. The case where the band is “rejected” will be described.
[0075]
The example of the second embodiment will be described with reference to FIGS. 11 to 13, but FIGS. 1 to 7 are also referred to as appropriate. The setting of the number of mobile stations to which the base station 19 can be connected at the same time, the time zone allocation area, and the like is the same as in the first embodiment. However, it differs from the example of the first embodiment in that the reservation request time zone desired by the mobile station 16 is partially filled with up to five mobile stations.
[0076]
FIG. 11 is a diagram showing an example of a reservation time of the communication time reservation system according to the second embodiment of the present invention, and FIG. 12 is a communication time reservation system according to the second embodiment of the present invention. FIG. 13 is a diagram showing an example of time domain allocation of a base station before reservation at a certain time (9:10), and FIG. 13 is a diagram showing a communication time reservation system according to the second embodiment of the present invention. 12 is a diagram showing an example of time domain allocation of a base station before reservation at a certain time (9:20) different from FIG.
[0077]
As shown in FIG. 12, at the start time (9:10) of the communication request time zone of the mobile station 16, five mobile stations are already assigned to the downlink phase and the uplink phase. As described above, since the maximum number of mobile stations that can be connected to the base station 19 at the same time is 5, no more mobile stations can be assigned to the base station 19 at the same time.
[0078]
In such a case, the base station 19 cannot make a reservation for the communication request time zone in this time zone, and can make a reservation for the communication request time zone (for example, two before and after the communication request time zone). Reply to the user by e-mail. The user can take appropriate measures such as changing the communication request time zone by reading the electronic mail returned from the base station 19.
[0079]
In this case, by setting the start time of the communication request time zone from 9:20 as shown in FIG. 11, the base station 19 sets the communication request time zone of the mobile station 16 in the blank areas 83 and 84 of FIG. Since it can be assigned, connection to the base station 19 becomes possible. The user transmits this communication request time zone again to the base station 19 by e-mail, and waits for a reply from the base station 19.
[0080]
In this way, even when the connection is rejected by the base station 19, the user can take the second best response according to the situation.
[0081]
(Third embodiment)
In the following example of the third embodiment, description will be made with reference to FIGS. 14 to 15, but FIGS. 1 to 7 are also referred to as appropriate. The setting of the number of mobile stations to which the base station 19 can be connected simultaneously, the time zone allocation area, and the like are the same as in the first and second embodiments. However, the mobile station 16 that reserves the communication time with the base station 19 desires data transmission / reception with the mobile station 15 instead of the base station 19 as a data transmission / reception partner.
[0082]
FIG. 14 is a diagram showing an example of a reservation time of a communication time reservation system according to the third embodiment of the present invention, and FIG. 15 is a communication time reservation system according to the third embodiment of the present invention. FIG. 2 is a diagram showing an example of time domain allocation of a base station after a reservation at a certain time (7:40).
[0083]
As shown in FIG. 14, in the communication request time zone of the mobile station 16, the mobile stations that have already been assigned a time frame are the mobile station 11 and the mobile station 12. As described above, since the maximum number of mobile stations to which the base station 19 can be connected simultaneously is 5, it is possible to increase the number of mobile stations allocated.
[0084]
Since the mobile station 16 wishes to communicate with the mobile station 15, it is necessary to make a reservation for not only the time frame of the mobile station 16 but also the time frame of the mobile station 15 when reserving the communication time. When making a reservation for the communication time, the mobile station 19 is requested to make reservations for the two communication frames of the mobile stations 15 and 16. In this case, since the time frame can be assigned, the base station 19 assigns the mobile station 15 to the time regions 85 and 87 and assigns the mobile station 16 to the time regions 86 and 88 as shown in FIG.
[0085]
Thus, when it is desired to perform communication between two mobile stations, it can be realized by securing the communication frames of the two mobile stations at the time of reservation at the same time.
[0086]
【The invention's effect】
  As described above, as is clear from the above description, when the user wants to use a wireless communication system such as a hot spot in the time zone specified by the user, the user can always access the wireless communication system. And a base that can secure a communication band according to the purpose of the userStationIt becomes possible to provide.
[0087]
Further, the base station notifies the mobile station of the available time zone or a base station of another accessible wireless communication system when there is no available communication time zone. However, it becomes possible to shift the access time or access another wireless communication system.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a configuration of a base station, a mobile station, and a communication time reservation system according to the present invention.
FIG. 2 is a diagram showing an example of a block configuration of a base station constituting the communication time reservation system of the present invention.
FIG. 3 is a diagram showing an example of a block configuration of a mobile station constituting the communication time reservation system of the present invention.
FIG. 4 is a block diagram showing an example of a configuration of a wireless communication apparatus according to the present invention.
FIG. 5 is a diagram illustrating an example of a configuration of a communication frame used in a radio communication system including a base station and a mobile station according to the present invention.
FIG. 6 is a flowchart when a communication time slot reservation method in the communication time reservation system according to the present invention is mainly focused on a base station.
FIG. 7 is a flowchart when a communication time zone reservation method in the communication time reservation system of the present invention is mainly focused on a mobile station.
FIG. 8 is a diagram showing an example of a communication time slot reservation of the communication time reservation system according to the first embodiment of the present invention.
FIG. 9 is a diagram showing an example of time domain allocation of a base station before reservation in the communication time reservation system according to the first embodiment of the present invention.
FIG. 10 is a diagram showing an example of reassignment of the time domain of a base station after reservation in the communication time reservation system according to the first embodiment of the present invention.
FIG. 11 is a diagram showing an example of a communication time slot reservation of the communication time reservation system according to the second embodiment of the present invention.
FIG. 12 is a diagram showing an example of time domain allocation of a base station before reservation at a certain time (9:10) in the communication time reservation system according to the second embodiment of the present invention.
FIG. 13 is a diagram showing an example of time domain allocation of a base station before reservation at a certain time (9:20) different from FIG. 12 in the communication time reservation system according to the second embodiment of the present invention; It is.
FIG. 14 is a diagram showing an example of a communication time slot reservation of the communication time reservation system according to the third embodiment of the present invention.
FIG. 15 is a diagram showing an example of time domain allocation of a base station after a reservation at a certain time (7:40) in the communication time reservation system according to the third embodiment of the present invention.
FIG. 16 is a diagram illustrating a configuration example of a conventional wireless communication system.
FIG. 17 is a diagram illustrating a frame configuration example of a wireless communication system using a conventional centralized control method.
FIG. 18 is a diagram showing an example of a hot spot.
[Explanation of symbols]
1 Internet
2 Media server
3 TV receiver
4 PC
5 Mobile phones
10, 20 Wireless communication system
11-16, 21 Mobile station
19, 25 Base station
29, 29a, 29b Transmission / reception antenna
30, 30a, 30b Wireless communication device
31 Communication control unit
32 Antenna duplexer
33 RF / IF receiver
34 Signal strength detector
35 A / D converter
36 Demodulator
38 Bus control unit
39 Modulator
40 D / A converter
41 RF / IF transmitter
50a, 50b E-mail processing device
51a, 51b I / O interface device
52b display device
53b Input device
54a, 54b Data processing device
55a, 55b System control device
71-1 (N-1) th frame
71-2 (N) th frame
71-3 (N + 1) th frame
72 Control information
73-1 to 73-M Downlink Phase Segment
74 Uplink Phase
75 preamble
76-1 to 76-M Data Payload
81-1, 81-3, 82-1, 82-3 Time domain (blank period)
81-2, 82-2 Time domain (after mobile station 16 allocation)
83,84 hours (blank period)

Claims (5)

A base station in a radio communication system that allocates a communication frame by designating a communication time and a communication channel to the mobile station in response to a communication frame allocation request from a mobile station,
Means for identifying, as a communication reservation request, a communication frame allocation request from the mobile station that has designated a reservation request time zone at least a predetermined time before the desired communication start time;
Means for notifying the mobile station whether or not the communication frame can be allocated;
With
In response to the communication reservation request, the communication frame is allocated with priority over the communication frame allocation request other than the communication reservation request, and the communication frame allocation time slot of the downlink phase is the time slot of the uplink phase communication frame allocation. rather than multi-than,
The base station characterized in that the notification means to the mobile station notifies a base station of another accessible wireless communication system .   The wireless communication device further comprises wireless communication means for performing wireless communication with the mobile station and wired communication means for performing wired communication with the mobile station, and receives the communication reservation request using wireless or wired communication. Item 4. The base station according to Item 1.   The base station according to claim 1, wherein the communication reservation request is provided by electronic mail. The communication reservation request includes means for identifying a mobile station using a reserved communication frame based on a MAC address and ESS-ID information of a mobile station using the reserved communication frame included in the communication reservation request. 2. The base station according to 2 . When the communication request time zone of the mobile station overlaps with the communication request time zone already notified from another mobile station, the communication frame can be further allocated to the mobile station. If so, assign a communication frame to the mobile station,
The base station according to claim 1, wherein when the communication frame is insufficient, the communication frame is not allocated to the mobile station.

Images