JP2000165927A - Radio communication system, communication controller, radio base station and radio communicating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform data transfer that does not cause communication service deterioration due to interference potential by performing control so that 1st and 2nd communication timing can not be overlapped when a 1st frequency used by a 1st radio channel is the same as a 2nd frequency used by a 2nd radio channel. SOLUTION: Radio base stations a11, b12 and c13 are connected through a communication network 10 through cable lines or a radio channel. Mobile stations a17 and b18 perform communication with the radio base stations a11 and c13 corresponding to radio zones 14 and 16 where they are located. A frequency managing part 19 manages the current use situation of a frequency by the stations a11, b12 and c13 connected to the network 10. The stations a11, b12 and c13 refer to information in the part 19 that is stored by the part 19, store an octet number necessary to transmit data at an optional position in a band reservation data part in a frame and then, perform data transfer by using the position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system, a communication control device, a radio base station, and a radio communication method in which a plurality of radio base stations are connected via a communication network.

[0002]

2. Description of the Related Art In a conventional radio communication system, when a radio base station determines a frequency to be allocated to communication with a mobile station, an interference wave from another radio base station communicating using the frequency is determined. Is measured, and it is determined whether or not the communication quality of the radio channel determined by the level of the interference wave satisfies the communication quality required for communication with the mobile station. The frequency is assigned only to. At this time, the type of communication to which the frequency is assigned is not considered.

TDMA system (time division multiple access system)
Is used, data requiring various service qualities are communicated within the radio base station using the same frequency. In order to provide communication that requires real-time performance, it is necessary to set the communication quality of the wireless line to be high and prevent retransmission due to transmission errors beforehand, but provide communication that requires best effort service (best effort service). To this end, a certain level of transmission error is allowed, so that the radio channel quality required for communication that requires real-time properties is not required.

[0004] At this time, if the radio base station performs frequency allocation so as to provide communication quality of a radio channel required for communication requiring real-time performance, communication information requesting a best effort service is more than necessary. Is provided, and the frequency utilization efficiency is reduced. Also, if the radio base station performs frequency allocation so as to provide the communication quality of the radio channel required for communication requesting the best-effort service, frequency utilization efficiency will be high, but communication information requiring real-time performance However, since only the same communication quality is provided, retransmission control or the like due to a transmission error is required, and the data transmission delay is significantly increased.

[0005]

As described above, in the conventional wireless communication system, if the frequency allocation is performed so as to provide the communication quality of the wireless line required for the communication requiring the real-time property, the best effort service is provided. , Communication quality more than necessary is provided for the communication information requesting the frequency, and the frequency utilization efficiency is reduced. Also,
If the radio base station performs frequency allocation to provide the communication quality of the radio link required for the communication requesting the best effort service, the frequency utilization efficiency increases,
Since only the same communication quality is provided for communication information requiring real-time characteristics, there is a problem that retransmission control or the like due to a transmission error is required.

[0006] The present invention solves such a problem, and allocates a frequency so as to satisfy the communication quality of a radio line required for communication requesting a best effort service, and further increases the communication quality. A wireless communication system, a communication control device, a wireless base station, and the like that provide data transfer that does not cause degradation of communication service due to interference waves even for communication that requires real-time performance.
And a wireless communication method.

[0007]

A wireless communication system according to the present invention comprises a plurality of wireless terminals, a plurality of wireless base stations for transmitting and receiving wireless signals to and from the wireless terminals, and a first wireless terminal between the wireless terminals and the wireless base station. The first to set the first frequency to use on the radio line
Frequency setting means, and a second frequency setting means for setting a second frequency used in a second radio line between another radio terminal and another radio base station.
Frequency setting means, first setting means for setting a first communication timing used in a first wireless line, and second setting means for setting a second communication timing to be used in a second wireless line And a control means for controlling the first communication timing and the second communication timing so that they do not overlap when the first frequency and the second frequency are the same.

Further, the radio communication system of the present invention
When the setting of the wireless line is based on a communication resource securing request for securing a predetermined communication resource, the control means does not overlap the first communication timing with the second communication timing and uses the communication resource. It is characterized by controlling to secure.

Further, according to the radio communication method of the present invention, a first step of setting a first frequency used in a first radio channel between a radio terminal and a radio base station, and another radio terminal and another radio base station A second step of setting a second frequency used by the second wireless line between the stations, a third step of setting a second communication timing used by the second wireless line, and a first frequency If the second frequency is the same as the second frequency, the first communication timing used in the first wireless channel is controlled so that the second communication timing does not overlap.

[0010] The communication control apparatus of the present invention further comprises: first frequency setting means for setting a first frequency used in a first radio line between a radio terminal and a radio base station; First setting means for setting a first communication timing to be performed,
A first frequency and a second frequency between another wireless terminal and another wireless base station.
Control means for controlling the first communication timing and the second communication timing used in the second wireless line so that they do not overlap when the second frequency used in the second wireless line is the same. It is characterized by having done.

Further, the radio base station of the present invention comprises a first frequency setting means for setting a first frequency used in a first radio channel between the radio terminal and the own radio base station; First setting means for setting a first communication timing to be used,
A first frequency and a second frequency between another wireless terminal and another wireless base station.
Control means for controlling the first communication timing and the second communication timing used in the second wireless line so that they do not overlap when the second frequency used in the second wireless line is the same. It is characterized by having done.

Further, the radio base station according to the present invention comprises: first frequency setting means for setting a first frequency used in a first radio channel between a radio terminal and its own radio base station; A communication resource securing request detecting means for detecting that the setting is based on a communication resource securing request for securing a predetermined communication resource, and a first frequency, between the other radio terminal and another radio base station When the second frequency used in the second wireless channel is the same and the communication resource securing request is detected by the communication resource securing request detecting means, the first communication timing used in the first wireless channel And control means for controlling the second communication timing used in the second wireless line so that the second communication timing does not overlap.

The wireless communication system of the present invention is used for a plurality of wireless terminals, a plurality of wireless base stations for transmitting and receiving wireless signals to and from the wireless terminals, and a first wireless line between the wireless terminals and the wireless base stations. Frequency setting means for setting the first frequency, the communication quality when using the frequency, to satisfy the communication quality required for providing the first communication service,
Communication timing setting means for setting a first communication timing to be used in the first radio line, and a second radio line between another radio terminal and another radio base station using the same frequency as the first frequency. If there is a second communication service requesting higher communication quality than the first communication service, the second communication using the first communication timing set by the communication timing setting means in the second wireless line Control means for controlling so as not to overlap with the timing.

[0014] The wireless communication method according to the present invention is characterized in that a first frequency used in a first wireless channel between a wireless terminal and a wireless base station has a communication quality in the case of using the first frequency which is a first communication service. A first step of setting so as to satisfy communication quality required for providing, and a second wireless line between another wireless terminal and another wireless base station using the same frequency as the first frequency, If there is a second communication service that requires higher communication quality than the first communication service, the first communication timing used on the first wireless line is changed to the second communication timing used on the second wireless line. And a second step of controlling so as not to overlap.

[0015] The communication control apparatus of the present invention further comprises a first communication service which uses the first frequency used in the first wireless link between the wireless terminal and the wireless base station when the communication quality using the frequency is the first communication service. Frequency setting means for setting so as to satisfy communication quality required for providing
Communication timing setting means for setting the communication timing of the first communication service, the communication higher than the first communication service in a second wireless line between another wireless terminal and another wireless base station using the same frequency as the first frequency If there is a second communication service that requires quality, the first communication timing set by the communication timing setting means is used by the second communication
And control means for controlling the communication timing so as not to overlap with the second communication timing.

Further, the radio base station of the present invention detects that the setting of the first radio channel between the radio terminal and the self radio base station is based on a communication resource securing request for securing a predetermined communication resource. When the communication resource securing request detecting means detects the communication resource securing request, the first
The communication quality when using this frequency,
Means for setting a frequency to be set so as to satisfy the communication quality required for providing the first communication service, and a first frequency, and a second frequency line used between another radio terminal and another radio base station. When the second frequency is the same, the first communication timing used in the first wireless line, and control means for controlling the second communication timing used in the second wireless line so as not to overlap It is characterized by having.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a communication network system according to an embodiment of the present invention. In FIG. 1, a wireless base station a (11), a wireless base station b (12), and a wireless base station c (13) are connected via a communication network 10 by a wired line or a wireless line. The mobile station a (17) and the mobile station b (18) communicate with a wireless base station corresponding to the wireless zone in which the mobile station is located. When the mobile station belongs to the wireless zone 14, communication with the wireless base station a is performed. When the mobile station belongs to the wireless zone 15, communication with the wireless base station b is performed. When the mobile station belongs to the wireless zone 16, communication with the wireless base station c is performed. Communication is performed respectively.

The communication network 10 has a frequency management unit 19. The frequency management unit manages the current use status of the frequency in each wireless base station connected to the communication network 10.

FIG. 2 shows an example of how the frequency management unit manages the frequency usage. In the example of FIG. 2, for each wireless base station connected to the communication network 10, the frequency used by the base station for communication and the reservation in the case of performing communication with bandwidth reservation for the frequency. Bands are stored in association with each other. In the example of FIG. 2, the wireless base station a performs communication using the frequency f1, and at this time, a 5 Mbps band is reserved. The wireless base station b is not currently performing communication. Further, the wireless base station c performs communication using the frequency f2, and at this time, a 3 Mbps band is reserved.

Such band securing is particularly necessary when providing a service that requires real-time properties or when providing a service that guarantees the lower limit of the data transfer rate.

For example, ATM (Asynchronous)
s Transfer Mode (asynchronous transfer mode)
CBR (Constant B)
it Rate service and real-time VBR (Va
Reliable BitRate) service uses ATM
In order to require real-time performance for cell communication, the CBR service transfers ATM cells at a peak cell rate (PCR), and the VBR service transfers STM (Sustainable Cell R).
ate: sustained cell rate), it is necessary to guarantee the transfer of ATM cells at each time.
Alternatively, it is necessary to secure a band corresponding to the SCR.
Also, in the IP (Internet Protocol) service, when providing a guaranteed service that guarantees a transfer delay of an IP packet, it is necessary to secure a band necessary to provide a peak speed for guaranteeing the transfer delay.

Further, A which is one service of the ATM system
When providing a BR (Available Bit Rate) service, it is not necessary to guarantee real-time performance, but MCR (Minimum Cell Rat)
e; minimum cell rate). Therefore, it is necessary to secure a band corresponding to the MCR even on a wireless line.

UB, which is one service of the ATM system,
When providing an R (Unspecified Bit Rate) service, or when providing a best-effort service, which is a type of IP service, the real-time property and the lower limit of the data transfer rate are not guaranteed. Accordingly, it is not necessary to secure a band on a wireless line. For example, the transfer is performed using a band not reserved for another service.

It is also possible to determine whether or not to secure the band of the wireless channel based on the type of the upper layer protocol for performing the data communication. For example, FTP (File Transfer) used when performing file transfer or the like.
When (R Protocol) is executed, a large amount of data is continuously transmitted. Therefore, it is conceivable to secure a necessary band on a wireless line and perform data transfer using the band.

Communication between the radio base station and the mobile station is performed using TDMA.
-TDD method (time division multiple access / time division duplex method)
FIG. 3 shows an example of the configuration of a radio frame in the case of using.
The radio frame is composed of a control information section 2 for describing control information and the like.
1. A bandwidth reservation data section 22 capable of describing data with bandwidth reservation, and a non-reservation data section 23 for describing data without bandwidth reservation. This frame has a fixed length, and the sum of the number of octets occupied by the band reservation data portion and the number of octets occupied by the non-reserved data portion in one frame is constant, but each octet number can be set variably.

In the TDMA-TDD system, communication information destined for a radio base station (upward direction) from an arbitrary terminal and communication information destined for an arbitrary terminal (downstream direction) are transmitted from an arbitrary terminal at the same frequency in a time-division manner. I do. Therefore, in both the band reservation data portion and the non-reservation data portion of the radio frame, the communication information in the up direction and the communication information in the down direction are inserted.

In the band reservation data section, it is possible to describe data with a band reservation and, with respect to a portion where a band reservation is not made, data without a band reservation. Further, it is also possible to adopt a configuration of a wireless frame in which the data without bandwidth reservation is described only in a portion of the bandwidth reservation data portion where the bandwidth reservation is not made, without providing the data portion without reservation in the wireless frame.

When providing a service that requires real-time performance as described above, or when providing a service that guarantees the lower limit of the data transfer rate, the number of octets required to transmit the data is determined by the number of frames. After securing the data at an arbitrary position in the bandwidth reservation data section, data transfer is performed using the position. It is assumed that the number of octets once secured at an arbitrary position in the bandwidth reservation data section is continuously secured at the same position in a continuous frame until the transmission of the data is completed.

By the way, when determining the position where the required number of octets is to be secured in the band reservation data section, the radio base station does not independently determine the position but performs communication using the same frequency as the radio base station. This is performed in consideration of the situation of securing the number of octets in the band reservation data section in another wireless base station to be performed.

FIG. 4 shows how the number of octets is secured in the bandwidth reservation data section. In FIG. 4, the radio base station x and the radio base station y perform communication using the same frequency,
This indicates that the wireless base station z newly starts communication using the same frequency. Note that the radio base station x has already secured the number of octets indicated by 31 and the radio base station y has secured the number of octets indicated by 32 for each frame. In addition,
It is desirable that radio frames be synchronized between radio base stations that communicate using the same frequency. That is, synchronization is established between the radio base stations x, y, and z such that the heads of the radio frames appear at the same time.

In the radio base station z, the number of octets for which a band can be reserved in one frame (the number of octets in the band reservation data section) is determined by another radio base station (radio base station x) communicating using the same frequency. , Y), only the number of octets obtained by subtracting the number of octets for which bandwidth reservation has already been made can be reserved. Also, the position (33) where the position in the band reservation data section where band reservation is possible does not overlap with the position (31, 32) in the band reservation data section where band reservation is performed in the radio base stations x and y.
Shall be limited to

The reason for providing such a restriction is to prevent the communication quality from deteriorating at the time of data transmission with band reservation due to mutual interference that may occur between different radio base stations that perform communication using the same frequency. is there.

For example, if the radio base stations x and y independently determine the band reservation position in the band reservation data section, FIG.
As shown in (a), there is a possibility that data transmission with bandwidth reservation at the same time is performed in different radio base stations. At this time, there is a high possibility that the communication data in the overlapped portion in time will be erroneous due to the deterioration of the communication quality due to the interference.

However, if the radio base stations x and y determine the band reservation positions in consideration of the other band reservation positions as shown in FIG. 4, as shown in FIG.
Transmission of data with bandwidth reservation at the same time is not performed in different radio base stations. Therefore, at a portion where data transmission with band reservation is performed, transmission and reception of communication data can be performed without suffering deterioration of communication quality due to interference.

By the way, as shown in FIG. 6 (a), it is possible to insert data without bandwidth reservation in a portion where no bandwidth reservation is made in the bandwidth reservation data portion of the frame. However, when the deterioration of the communication quality due to the occurrence of interference is detected, as shown in FIG. 6B, in order to prevent the deterioration of the communication quality of the data accompanied by the band reservation, as shown in FIG. It is desired that communication using the band reservation data section be interrupted.

As shown in FIG. 4, between the radio base stations where the deterioration of the line quality due to the interference is very small and the deterioration of the communication quality at the data level such as lack of communication information does not occur. Band reservation may be performed without considering the number of octets secured in the band reservation data section in the wireless base station.

FIG. 7 is a flowchart showing a method of allocating radio frequencies and a method of securing data in a frame.

When a new communication request accompanied by bandwidth reservation is issued (step S10), the radio base station determines whether or not a current frequency has already been allocated (step S1).
1). If a frequency has already been assigned (Yes in step S11), the number of free octets in the band reservation data portion in the frame is checked at that frequency (step S12), and it is determined whether the desired number of octets can be secured. A determination is made (step S13). If the number of octets can be secured (Yes in step S13), the necessary number of octets is reserved, and a new communication request is accepted using the frequency already in use (step S14).

If no frequency is assigned in the radio base station (No in step S11), or if a desired band cannot be secured with the currently used frequency (No in step S13), It is determined whether there is a frequency that can satisfy the communication quality among the frequencies that can be used in the base station (step S15).
If such a frequency exists (Yes in step S15), the number of free octets in the band reservation data part in the frame is checked at that frequency (step S1).
6) It is determined whether a desired number of octets can be secured (step S17). If the number of octets can be secured (Yes in step S17), the radio base station newly uses the frequency selected in step S15, reserves the required number of octets, and issues a new communication request. Accept (Step S18).

If the desired number of octets cannot be secured (No in step S17), it is determined whether or not there is another frequency that satisfies the communication quality (step S15). It is checked whether a desired number of octets can be secured. If there is no candidate frequency (No in step S15), band allocation for the new communication request is rejected (step S19).

In step S15, it is searched whether or not there is a frequency to be allocated. As the communication quality at that time, for example, the intensity of the interference wave at the radio base station at the frequency to be allocated is used. Then, the frequency at which the interference wave is lower than a predetermined threshold value is taken as an allocation target, and the procedures of steps S16 and S17 are executed.

The threshold is determined based on the communication quality to be guaranteed for data transmission without bandwidth reservation. The algorithm shown in FIG. 7 is used to determine the position for securing the required number of octets for transmitting the data within the frame by the algorithm shown in FIG. It is not necessary to use the communication quality required for data transmission as a condition for frequency selection.

In general, the quality of the radio link required for data transmission that guarantees the real-time property and the lower limit of the data transfer rate is such that the radio link required for sufficient data transmission by the best-effort service does not require such guarantee. Require more stringent quality than quality. This is to prevent deterioration of transmission delay quality due to retransmission or the like due to a data transmission error.

If the algorithm shown in FIG. 7 is adopted, for data transmission requiring more stringent radio channel quality, the position for securing the required number of octets in a frame is determined so as not to cause quality degradation due to interference waves. ,
It is not necessary to provide the radio link quality required for data transmission that guarantees the real-time property and the lower limit of the data transfer rate,
What is necessary is to select a frequency capable of providing the radio channel quality required for data transmission of the best effort service, which requires a more moderate radio channel quality. For this reason, the number of frequency candidates that can be used increases, and it can be expected that the frequency use efficiency will increase.

When checking the number of empty octets in the band reservation data section performed in steps S12 and S16, the radio base station refers to information held in the frequency management section.

FIG. 8 shows steps S12 and S16.
Shows how information is exchanged between the radio base station and the frequency management unit when the process is performed. FIG. 8 shows an example in which the radio base station b collects information in the frequency management unit in the communication network system shown in FIG.

The radio base station b transmits a message to the effect of checking the reserved band status of the frequency f1 to the frequency management unit 19 via the communication network 10 (41). Then, the frequency management unit checks the reserved band information of the frequency f1 based on the management information held therein (in the example of FIG. 2, 5 Mbps is reserved at the wireless base station a), and the fact that 5 Mbps is reserved. Is transmitted to the radio base station b via the communication network 10 together with the position information in the band reservation data in which the band (5 Mbps) is secured (42). These messages are locally defined in the communication network 10 and used for communication between each radio base station and the frequency management unit.

The radio base station that has newly secured the band notifies the frequency management unit 19 of this fact, and the frequency management unit 19 updates the management information based on the notification from the radio base station. Also, when the wireless base station has finished securing the band, the wireless base station notifies the frequency management unit 19 to that effect and requests the frequency management unit to update the management information.

As described above, the communication between the radio base station and the mobile station is TD
Although the case of performing in the MA-TDD method has been described as an example,
The present invention is effective even when another multiple access method is used.

For example, when TDMA-FDD (Time Division Multiple Access / Frequency Division Duplex) is used, except that the frequency at which uplink communication information is delivered and the frequency at which downlink communication information are delivered are different, The radio frame configuration and the like can be realized by adopting an embodiment similar to the TDMA-TDD system. In this case, in each radio base station, for the radio frame defined in each of the frequency used in the uplink communication and the frequency used in the downlink, the position for securing the required number of octets in the band reservation data section is the same. The determination is made with reference to the band securing information in the band reservation data portion of the radio frame in another radio base station that is performing communication using the frequency.

In addition, when the FDMA system (frequency division multiple access system) is used, the same embodiment can be adopted and realized. When using the FDMA scheme, the radio base station allocates one frequency to communication with one mobile station (in some cases, allocates a plurality of frequencies to one mobile station). Even when the FDMA scheme is adopted, as shown in FIG. 9, among wireless base stations that perform communication using the same frequency, a time position at which a band is reserved in each wireless base station is recognized. Control is performed so that data transmission with bandwidth reservation does not occur in a plurality of base stations at the same time.

According to the present invention, synchronization is established between frames defined by both radio base stations so that data transmission with bandwidth reservation is not performed at the same time between radio base stations communicating using the same frequency. Need to take. FIG.
FIG. 2 is a flowchart showing how to establish frame synchronization between wireless base stations. FIG. 11 shows a wireless base station y
Shows an example of performing synchronization with a frame being transmitted in the wireless base station x.

The radio base station that executes the frame synchronization control (step S20) notifies another radio base station of a message indicating that the radio base station performs the frame synchronization control (step S21). . In the radio base station receiving the message, a predetermined period,
The transmission of data without bandwidth reservation is interrupted, and only the transmission of data with bandwidth reservation is performed (step S22). The radio base station that performs the frame synchronization control monitors the interference wave from another radio base station, thereby confirming the position at which the radio base station inserts the data with the band reservation (step S2).
3) Perform frame synchronization (step S2)
4).

In step S22, the radio base station that interrupts the transmission of data without bandwidth reservation uses the same radio frequency as that used by the radio base station that performs frame synchronization control. Limited to base stations.

FIG. 12 shows a communication network system according to one embodiment of the present invention. The communication network system shown in FIG. 12 differs from the communication network system shown in FIG. 1 in that the frequency management units 111, 121, and 131 are provided in each radio base station.
With. These frequency management units manage at least the current usage status of the radio base station connected to the communication network 10 (including the radio base station itself) at the frequency used by the radio base station.

That is, as shown in FIG. 1, in addition to the method of implementing the present invention by centrally managing the frequency use status, as shown in FIG. The present invention can be implemented by performing distributed management.

In the case where the use condition of the frequency is managed in a distributed manner by each radio base station, the use condition of the frequency managed by the radio base station must be periodically updated. FIG.
FIG. 12 shows an example in which the radio base station b collects information in its own frequency management unit in the communication network system shown in FIG.

When it is desired to know the reserved band status of the frequency f1, the radio base station b broadcasts a message for checking the reserved band status of the frequency f1 to all the radio base stations via the communication network 10. (51). Then, the radio base station using the frequency f1 (the radio base station a in the example of FIG. 13) transmits a message describing the band (5 Mbps in the example of FIG. 13) secured by itself. Is transmitted to the wireless base station b via the communication network 10 together with the position information in the band reservation data in which the data is secured (52). These messages are locally defined in the communication network 10 and used for communication between the respective wireless base stations.

The radio base station that newly secures the band notifies all the radio base stations of the fact, and the radio base station that has received the notification notifies the radio base station of its own frequency management unit. Update management information. Also, when the wireless base station has finished securing the band, the wireless base station notifies all the wireless base stations of the termination and requests updating of the management information.

[0061]

As described above, according to the present invention, for communication requiring real-time characteristics, the position where the required number of octets is secured in the frame is the position secured by another radio base station. Therefore, it is possible to provide a real-time communication service without suffering the deterioration of the communication quality due to the interference wave. In addition, the radio base station assigns a frequency allocation that can provide a lower level of communication quality (for example, communication quality required for best effort service), instead of the communication quality of a radio line required for communication that requires real-time properties. The frequency utilization efficiency can be increased because the frequency can be increased.

[Brief description of the drawings]

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

FIG. 2 is a management table diagram in a frequency management unit according to one embodiment of the present invention.

FIG. 3 is a configuration diagram of a radio frame of a TDMA-TDD system according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an operation of a band reservation data section according to one embodiment of the present invention;

FIG. 5 is an explanatory diagram of an operation of a band reservation data section according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation of a band reservation data section according to one embodiment of the present invention;

FIG. 7 is a flowchart illustrating a method of allocating radio frequency and securing data in a frame according to an embodiment of the present invention;

FIG. 8 is an explanatory diagram of an operation of a radio base station and a frequency management unit according to one embodiment of the present invention;

FIG. 9 is an operation explanatory diagram when the FDMA system according to one embodiment of the present invention is adopted;

FIG. 10 is a flowchart showing how to establish frame synchronization according to an embodiment of the present invention.

FIG. 11 is an explanatory diagram of an operation of performing synchronization with a frame being transmitted according to an embodiment of the present invention;

FIG. 12 is an explanatory diagram of a wireless communication system according to an embodiment of the present invention.

FIG. 13 is an explanatory diagram illustrating an operation of collecting information in the frequency management unit according to the embodiment of the present invention.

[Explanation of symbols]

 10 Communication network (wired or wireless) 11 Radio base station a 12 Radio base station b 13 Radio base station c 14-16 Radio zone 17 Mobile station a 18 mobile station b 19 frequency management unit 111 frequency management unit 121 frequency management unit 131 frequency management unit

Claims (10)

[Claims] 1. A wireless communication system for performing wireless communication using time-division multiplexed wireless signals, comprising: a plurality of wireless terminals; a plurality of wireless base stations for transmitting and receiving the wireless signals to and from the wireless terminals; First frequency setting means for setting a first frequency used in a first radio channel between a terminal and the radio base station; a second radio channel between another radio terminal and the other radio base station Second frequency setting means for setting a second frequency used in the first communication means, first setting means for setting a first communication timing to be used in the first wireless line, and use in the second wireless line A second setting unit that sets a second communication timing to be performed, wherein the first communication timing and the second communication timing overlap when the first frequency and the second frequency are the same. Control means for controlling not to Wireless communication system, wherein the door. 2. The method according to claim 1, wherein the setting of the first wireless channel is based on a communication resource securing request for securing a predetermined communication resource. The wireless communication system according to claim 1, wherein control is performed such that timings do not overlap and the communication resources are secured. 3. A wireless communication method for performing wireless communication between a wireless terminal and a wireless base station using a time-division multiplexed wireless signal, wherein the wireless communication method is used in a first wireless line between the wireless terminal and the wireless base station. A first step of setting a first frequency; a second step of setting a second frequency to be used in a second radio line between the another radio terminal and the another radio base station; A third step of setting a second communication timing to be used in the second wireless line, and a first step to be used in the first wireless line when the first frequency and the second frequency are the same. And a fourth step of controlling the second communication timing so that the second communication timing does not overlap. 4. A communication control apparatus for a communication system for performing wireless communication between a wireless terminal and a wireless base station using a time-division multiplexed wireless signal, comprising: a first wireless circuit between the wireless terminal and the wireless base station; A first frequency setting means for setting a first frequency used in, a first setting means for setting a first communication timing used in the first wireless line, the first frequency, and the like If the second frequency used in the second wireless line between the wireless terminal and another wireless base station is the same, the first communication timing, the second used in the second wireless line 2. A communication control device, comprising: control means for controlling the communication timings so as not to overlap. 5. A radio base station of a radio communication system for performing radio communication using a time-division multiplexed radio signal, wherein a first frequency used in a first radio channel between the radio terminal and the radio base station is provided. A first frequency setting means for setting, a first setting means for setting a first communication timing used in the first wireless line, the first frequency, another wireless terminal and other wireless When the second frequency used in the second radio line between the base stations is the same, the first communication timing does not overlap with the second communication timing used in the second radio line And a control means for performing such control. 6. A radio base station of a radio communication system for performing radio communication using a time-division multiplexed radio signal, wherein a first frequency used in a first radio channel between the radio terminal and the radio base station is provided. A first frequency setting means to set, a communication resource securing request detecting means to detect that the setting of the first wireless line is based on a communication resource securing request to secure a predetermined communication resource, The first frequency is the same as a second frequency used in a second wireless channel between another wireless terminal and another wireless base station, and the communication resource securing request detecting unit detects the communication resource. When detecting a reservation request, the control unit includes control means for controlling a first communication timing used in the first wireless channel and a second communication timing used in the second wireless channel so as not to overlap. What you did The radio base station of a wireless communication system that symptoms. 7. A wireless communication system for performing wireless communication using time-division multiplexed wireless signals, comprising: a plurality of wireless terminals; a plurality of wireless base stations for transmitting and receiving the wireless signals to and from the wireless terminals; The first frequency used in the first radio line between the terminal and the radio base station, the communication quality when using the frequency, so as to satisfy the communication quality required to provide the first communication service Frequency setting means for setting, communication timing setting means for setting a first communication timing used in the first wireless line, another wireless terminal and another wireless base using the same frequency as the first frequency When there is a second communication service that requires higher communication quality than the first communication service on the second wireless line between the stations, the first communication timing set by the communication timing setting means Control means for controlling the communication so as not to overlap with the second communication timing used in the second wireless line. 8. A wireless communication method for performing wireless communication between a wireless terminal and a wireless base station using a time-division multiplexed wireless signal, wherein the wireless communication method is used in a first wireless line between the wireless terminal and the wireless base station. The first frequency, the first step of setting the communication quality when using the frequency, so as to satisfy the communication quality required for providing the first communication service, the same as the first frequency In a second wireless channel between another wireless terminal and another wireless base station using a frequency, if there is a second communication service that requests higher communication quality than the first communication service, the first The first communication timing used on the wireless line is
A second step of controlling so as not to overlap with a second communication timing used in the second wireless line. 9. A communication control apparatus for a wireless communication system for performing wireless communication between a wireless terminal and a wireless base station using a time-division multiplexed wireless signal, wherein a first wireless communication between the wireless terminal and the wireless base station is provided. A first frequency used in a line, a frequency setting means for setting a communication quality when the frequency is used so as to satisfy a communication quality required for providing a first communication service; and Communication timing setting means for setting a first communication timing used in a line, the second radio line between another radio terminal and another radio base station using the same frequency as the first frequency, When there is a second communication service requesting higher communication quality than the first communication service, the first communication timing set by the communication timing setting means is used in the second wireless line. Communication A communication control device, comprising: control means for controlling so as not to overlap with the timing. 10. A wireless base station of a wireless communication system for performing wireless communication using a time-division multiplexed wireless signal, wherein setting of a first wireless channel between a wireless terminal and a wireless base station thereof is
A communication resource securing request detecting means for detecting that the communication resource securing request is based on a communication resource securing request requesting securing of a predetermined communication resource; and A first frequency used in one radio line, a frequency setting means for setting communication quality when the frequency is used so as to satisfy communication quality necessary for providing a first communication service, When the first frequency is the same as the second frequency used in the second wireless channel between another wireless terminal and another wireless base station, the first communication used in the first wireless channel A wireless base station for a wireless communication system, comprising: timing and control means for controlling a second communication timing used in the second wireless channel so as not to overlap.