JP2002077979A - Apparatus and method for radio relay and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for radio relay and a recording medium wherein the timing of transmission of communication control information to self-supporting base stations in standby state is dispersed to prevent mutual interference among a plurality of radio repeaters. SOLUTION: Self-supporting station control carriers are transmitted to a self-supporting station twice during the period between time when one public station control carrier is received from a public base station and time when the next public station control carrier is received. At transmission/reception timing control portion 125, a first timing of transmission to the self-supporting station using a first channel (first frequency) is dispersedly set at random from timing of public station control carrier reception using equipment information specified to a radio repeater HA. A second timing of transmission to the self-supporting station using the first channel (first frequency) is generated based on the equipment information specific to the radio repeater HA using the first transmission timing as starting point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio relay apparatus, a radio relay method, and a radio relay method for relaying radio communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. The present invention relates to a recording medium on which a program to be executed is recorded, and in particular, a wireless relay device in which transmission timing of communication control information to a private terminal during standby is dispersed to avoid mutual interference between a plurality of wireless relay devices, The present invention relates to a relay method and a recording medium.

[0002]

2. Description of the Related Art Conventionally, TDMA (time division multiplex communication);
In mobile communications of the Time Division Multiple Access (Time Division Multiple Access) method, if the distance between the public base station and the private terminal is far, radio waves may not reach sufficiently. There has been proposed a method of arranging a wireless relay device called an antenna to smoothly perform wireless communication connection. FIG. 7 is a configuration diagram illustrating the concept of a mobile communication system using such a wireless relay device. In the figure, the self-operating terminal PS at the time of standby uses communication control information (LCCH) intermittently transmitted from the public base station CS using a control channel in order to save power.
Is received via the wireless relay device HA, and subordinate synchronization is performed with respect to the public base station CS.

[0003] The number of control channels is limited in terms of the allocation of communication channels and the like. However, adjacent public base stations CS1 and CS2 generate mutual interference at the time of transmission by means of network control, timing between public base stations. Avoidance systematically due to installation distance and other factors. The wireless relay device HA may be used in each home in a place where radio waves from the public base station CS are difficult to reach, and a plurality of wireless relay devices HA1, HA2, HA may be provided for each public base station CS1.
3 may be used. Each wireless relay device HA1, H
A2 and HA3 are desired to relay the radio waves of a public base station with good radio wave conditions in order to improve the communication quality. Therefore, the wireless relay device HA3 at the boundary that can receive the radio waves of both the base stations CS1 and CS2 is: It is connected to a public base station CS1 having a high electric field strength level.

However, in the plurality of wireless relay devices HA1, HA2, and HA3 connected to the public base station CS1, the intermittent reception timings from the same public base station CS1 match, so that each of the wireless relay devices HA1, HA2, and HA3 has the same The transmission timings for the self-managed terminals PS1, PS2, and PS3 tend to match. In general, not only in the TDMA system but also in a wireless communication system, it is difficult for the receiving side to determine whether or not a transmission wave of the same frequency is a desired transmission wave. By performing carrier sense on the transmission side, such mutual interference can be avoided.However, in a control channel in which limited frequency allocation is inevitable to expand the accommodation channel and reduce the burden on the standby side, However, there is a high probability of interference even if carrier sense is performed. In particular, in the TDMA system, since it is essential to synchronize from the viewpoint of time constraints, the establishment of mutual interference between wireless relay devices on the control channel becomes extremely high.

As a countermeasure against such a problem, Japanese Patent Laid-Open No.
Japanese Patent Publication No. -238100 proposes a “wireless relay device” that prevents mutual interference between a plurality of wireless relay devices when transmitting communication control information to the private terminal when the private terminal waits.

FIG. 8 is a timing chart exemplifying the relay timing of a communication channel by the conventional wireless relay device. That is, FIG. 8A shows a public base station CS,
FIG. 8 (b) shows a wireless relay device, and FIG. 8 (c) shows a private terminal, which are in communication operation. The upper side shows a receiving slot, and the lower side shows a transmitting slot. Further, in this specific example, one frame is divided into eight slots, and four slots are respectively allocated to transmission and reception.

First, at timing t1 from the public base station CS.
When a signal is transmitted to the wireless relay device HA using the first slot in the above, the wireless relay device HA selects a communication channel and transmits it to the private terminal PS using the sixth slot at timing t6. And relay the communication. on the other hand,
The signal from the private terminal PS is transmitted using the second slot at timing t2, and the wireless relay device HA similarly transmits the signal to the public base station CS using the fifth slot at timing t5. Relay.

Next, a method of avoiding mutual interference in the wireless relay device of the conventional example will be described with reference to FIGS. FIG. 9 is a timing chart illustrating timing control of intermittent transmission performed during the standby operation. That is, FIG. 9A shows the public base station C
S, FIG. 9 (b) is a wireless relay device, FIG. 9 (c) is a private terminal, and the upper side shows reception and the lower side shows transmission, respectively, and THA in the figure is an intermittent transmission cycle.

In the conventional wireless relay device, after receiving the communication control information intermittently transmitted from the public base station CS using the control channel, the timing of transmitting the communication control information to the private terminal PS is determined by the wireless relay station. Recognition I specific to device HA
D and the like are set so as to be randomly distributed. That is, in FIG. 9, at the timing t1, the public base station CS
When the communication control information is intermittently transmitted using the control channel from the wireless communication device HA, the wireless relay device HA intermittently transmits the communication control information to the private terminal PS at timing t2 which is delayed from the timing t1 by the interval T1. Here, the interval T1 is randomly set with a recognition ID or the like unique to the wireless relay device HA.

FIG. 10 is a timing chart for explaining timing control of intermittent transmission performed when mutual interference occurs with another wireless relay device during a standby operation. That is, FIGS. 10 (a), (b),
(C) is the first, second, and third wireless relay devices, respectively, where reception is shown on the upper side and transmission is shown on the lower side, and THA in the figure is an intermittent transmission cycle.

The mutual interference occurring at timing t2 in FIG. 10 is caused, for example, when the first wireless relay device is to be added to a mobile communication system having the second and third wireless relay devices. The intermittent transmission timing is set by the method described with reference to FIG. 9, but this occurs when the set timing causes mutual interference with another (second) wireless relay apparatus. In this case, the first wireless relay apparatus performs carrier sensing after the occurrence of the interference, and it is found that the timing is the same as the timing of the second wireless relay apparatus that has already been set. The transmission timing is shifted to timing t6 where there is little mutual interference.

[0012]

However, the above-described conventional wireless relay device has the following circumstances and problems. First, the intermittent transmission timing control during the standby operation is performed based on the reception timing of the communication control information intermittently transmitted from the public base station.
And so on, but the transmission timing is limited, so that there is a case where there is a case where the transmission timing collides with the intermittent transmission timing of another wireless relay device.

Second, unless it is possible to confirm that there is no mutual interference with another wireless relay device, the user cannot operate the interference detection operation because the wireless relay device cannot be used (wireless communication cannot be performed). Thus, the transmission timing is switched to a different transmission timing with no interference wave, but the transmission timing control for avoiding the interference is performed only after the mutual interference occurs. Third, if it is not possible to confirm that there is no mutual interference with another wireless relay device, the wireless relay device cannot be used (wireless communication cannot be performed). Although the transmission timing is switched to a different transmission timing with no wave, there is a case where the user does not notice when interference is occurring, and the incoming call is missed.

Fourth, since only information on the electric field strength of the interference wave is included in the selection conditions in the transmission timing control performed after the occurrence of the mutual interference, the power consumption in the standby state has not been reduced. Fifth, since the transmission timing is selected without interference waves regardless of the frequency of collision of the interference waves, the transmission timing may be different in an environment where there are many public base stations and other wireless relay devices. However, there is a situation in which the wireless relay device is completely used, and transmission cannot be performed.

The present invention has been made in view of the above-mentioned conventional circumstances and problems, and has been made in consideration of time division multiplex communication (TDMA).
In a wireless relay device that relays wireless communication between the public base station and the private terminal using the method, the transmission timing of communication control information to the private terminal during standby is dispersed,
An object of the present invention is to provide a wireless relay device, a wireless relay method, and a recording medium that avoid mutual interference between a plurality of wireless relay devices.

[0016]

According to a first aspect of the present invention, there is provided a radio relay apparatus comprising a public base station and a private terminal using a time division multiplex communication (TDMA) system. A plurality of timings for transmitting communication control information to the self-service terminal, wherein a device specific to the wireless relay device is used starting from a predetermined transmission timing of the communication control information. It is provided with timing control means for generating another transmission timing based on the information.

According to a second aspect of the present invention, there is provided a wireless relay apparatus for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. Before transmitting communication control information to the private terminal, carrier sense control means for performing carrier sense at all transmittable transmission timings, and based on the result of the carrier sense, the communication control information And timing control means for transmitting to the self-employed terminal.

According to a third aspect of the present invention, there is provided a wireless relay apparatus for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. After transmitting the communication control information to the self-employed terminal, the transmission control unit periodically thins out the transmission of the communication control information to the self-employed terminal at predetermined intervals to detect mutual interference, and as a result of the detection, A carrier sense control unit for performing carrier sense at all transmittable transmission timings, and a timing control unit for transmitting the communication control information to the self-service terminal at a reset timing without interference waves based on a result of the carrier sense. Is provided.

According to a fourth aspect of the present invention, there is provided a wireless relay apparatus for relaying wireless communication between a public base station and a private terminal by using a time division multiplex communication (TDMA) system. Carrier sense control means for performing carrier sense at all transmission timings, based on the result of the carrier sense, communication at a timing having a low interference level and closest to the reception timing of communication control information transmitted from the public base station. Timing control means for transmitting control information to the private terminal.

According to a fifth aspect of the present invention, there is provided a wireless relay apparatus for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. Before transmitting the communication control information to the private terminal, carrier sense control means for performing carrier sense at all transmittable transmission timings, as a result of the carrier sense, when there is no interference wave timing,
Timing control means for transmitting the communication control information to the private terminal at a timing at which the frequency of occurrence of mutual interference is low during a predetermined interval or more.

A wireless relay method according to a sixth aspect of the present invention is a wireless relay method for a wireless relay device that relays wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. When generating a plurality of timings for transmitting communication control information to the self-employed terminal, a timing for generating another transmission timing based on device information specific to the wireless relay device, starting from a predetermined transmission control information transmission timing It comprises a control step.

A wireless relay method according to a seventh aspect is a wireless relay method for a wireless relay device that relays wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. Before transmitting the first communication control information to the private terminal, a carrier sense control step of performing carrier sense at all transmittable transmission timings, and a timing without interference wave based on a result of the carrier sense control step. And a timing control step of transmitting the communication control information to the private terminal.

The wireless relay method according to claim 8 is a wireless relay method for a wireless relay device that relays wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. An interference detection step of detecting the mutual interference by thinning out the transmission of the communication control information to the private terminal at regular intervals after transmitting the first communication control information to the private terminal; and As a result, when mutual interference is detected, a carrier sense control step of performing carrier sense at all transmittable transmission timings, and based on a result of the carrier sense control step,
A timing control step of transmitting the communication control information to the private terminal at reset timing without interference waves.

A wireless relay method according to a ninth aspect is a wireless relay method for a wireless relay apparatus that relays wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system. A carrier sense control step of performing carrier sense at all transmittable transmission timings;
A timing control step of transmitting communication control information to the self-service terminal at a timing closest to a reception timing of communication control information transmitted from the public base station with a low interference level based on a result of the carrier sense control step. It is provided.

[0025] The wireless relay method according to claim 10 is
A wireless relay method of a wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) method, wherein the first communication control information is transmitted to the private terminal. A carrier sense control step of performing carrier sense at all transmittable transmission timings;
As a result of the carrier sense control step, when there is no timing with no interference wave, timing control for transmitting the communication control information to the private terminal at a timing where the frequency of occurrence of mutual interference is low during a predetermined interval or more. And steps.

Further, a computer-readable recording medium according to claim 11 is a computer-readable recording medium.
Alternatively, it is stored as a program for causing a computer to execute the wireless relay method described in 10.

In the wireless relay device according to claim 1 of the present invention, the wireless relay method according to claim 6, and the recording medium according to claim 11, wireless communication between a public base station and a private terminal using a TDMA system. When a plurality of timings for transmitting the communication control information to the private terminal are generated by the timing control means (timing control step), the transmission timing of the predetermined communication control information is used as a starting point, Another transmission timing is generated based on the device information. Here, the device information unique to the wireless relay device corresponds to an identification ID, a call code, and the like.

For example, first, the first channel (first frequency) is randomly selected by using device information unique to the wireless relay apparatus HA starting from the reception timing of the communication control information intermittently transmitted from the public base station as in the related art. First to send using
A transmission timing is set, and a second transmission timing is generated based on the device information unique to the wireless relay device, using the first transmission timing as a starting point, and a second channel (second frequency) is generated at the second transmission timing. ) To transmit the communication control information to the private terminal. Thus, even if the transmission of the communication control information at the first transmission timing collides with another wireless relay device and mutual interference occurs, the transmission of the communication control information is performed at another second transmission timing. ,
Since the number of transmission timings can be set to be increased as compared with the related art, interference between wireless relay devices can be avoided more reliably.

In the wireless relay device according to the second aspect, the wireless relay method according to the seventh aspect, and the recording medium according to the eleventh aspect, the wireless communication between the public base station and the private terminal is performed using the TDMA method. At the time of relaying, before transmitting the first communication control information to the private terminal, carrier sense control means (carrier sense control step) performs carrier sense at all transmittable transmission timings, and performs timing control means (timing control). Step), based on the result of the carrier sense (carrier sense control step),
Communication control information is transmitted to the private terminal at a timing without interference waves.

As described above, the carrier control is performed before transmitting the first communication control information to the private terminal, and the communication control information is transmitted to the private terminal at a timing where there is no interference wave. Interference can be avoided.

In the wireless relay device according to the third aspect, the wireless relay method according to the eighth aspect, and the recording medium according to the eleventh aspect, the wireless communication between the public base station and the private terminal is performed using the TDMA method. When relaying, after transmitting the first communication control information to the private terminal, the transmission control information is periodically transmitted to the private terminal at predetermined intervals (by the interference detection step) to detect mutual interference, As a result of the detection (interference detection step), when mutual interference is detected, carrier sense is performed by carrier sense control means (carrier sense control step) at all transmittable transmission timings, and timing control means (timing control step )), Based on the result of the carrier sense (carrier sense control step), the communication control information is automatically regenerated at the reset timing without interference wave. And so as to transmit to the terminal.

As described above, even after the first communication control information is transmitted to the private terminal, the transmission of the communication control information is periodically decimated at predetermined intervals to detect mutual interference, and when mutual interference is detected, carrier sense is performed. Is performed, the communication control information is transmitted to the private terminal at the reset timing without the interference wave, so that the interference can be avoided and the user does not notice when the interference occurs, as in the related art. The problem that a call is missed is also solved.

In the wireless relay device according to the fourth aspect, the wireless relay method according to the ninth aspect, and the recording medium according to the eleventh aspect, wireless communication between a public base station and a private terminal is performed using a TDMA system. When relaying, the carrier sense control means (carrier sense control step) performs carrier sense at all transmittable transmission timings, and the timing control means (timing control step) executes the carrier sense (carrier sense control step). Based on the result, the communication control information is transmitted to the private terminal at a timing having a low interference level and closest to the reception timing of the communication control information transmitted from the public base station.

In order to maintain synchronization with the public base station at all times and secure high-precision synchronization of ± several [μsec] to the private terminal, reception of communication control information transmitted from the public base station is required. Since it is necessary to operate with a relatively high-speed clock from the timing to the transmission timing of the communication control information to the private terminal, and the current consumption is large, the shorter the interval, the lower the power consumption of the device. Can be achieved.

Further, in the wireless relay device according to the fifth aspect, the wireless relay method according to the tenth aspect, and the recording medium according to the eleventh aspect, the wireless communication between the public base station and the private terminal is performed using the TDMA system. When relaying, the carrier sense control means (carrier sense control step) performs carrier sense at all transmittable transmission timings before transmitting the first communication control information to the private terminal, and performs timing control means (timing control). In step), as a result of the carrier sense (carrier sense control step), when there is no timing with no interference wave, the communication control information is self-managed at a timing where the frequency of occurrence of mutual interference is low during a predetermined interval or more. It is sent to the terminal.

As described above, when there is no timing with no interference wave, the communication control information is transmitted to the private terminal at a timing at which the frequency of occurrence of mutual interference is low during a predetermined interval or more. Even in an environment where there are a large number of public base stations and other wireless relay devices, there is no problem that the transmission timing is completely used by other wireless relay devices and the transmission cannot be performed.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a wireless relay apparatus, a wireless relay method, and a recording medium according to the present invention will be described with reference to [first embodiment], [second embodiment], and [third embodiment]. ], [Fourth Embodiment] and [Fifth Embodiment] will be described in detail in this order with reference to the drawings. In the description of each embodiment, the wireless relay device and the wireless relay method according to the present invention will be described in detail. However, regarding the recording medium according to the present invention, a recording medium storing a program for executing the wireless relay method is described. Therefore, the description is included in the following description of the wireless relay method.

[First Embodiment] FIG. 1 is a block diagram of a radio relay apparatus according to a first embodiment of the present invention. The wireless relay device HA of the present embodiment performs time division multiplex communication (TDMA).
This relays the wireless communication between the public base station CS and the private terminal PS using the system. In FIG. 1, the antenna 101, the wireless unit 103, the wireless control unit 105, the TDMA processing unit 107, and the control unit 109 It is provided with.

Here, the antenna 101 is a transmitting / receiving antenna, and the radio section 103 mainly has a receiving field strength measuring section (RSSI) 115 as means for mainly transmitting and receiving radio signals and detecting a receiving state. ing.
The wireless control unit 105 mainly performs modulation and demodulation, and the TDMA processing unit 107 mainly performs various TDMA processes such as encoding and decoding.

Further, the processing section 109 includes a transmission power control section 121, a carrier sense control section 123, a transmission / reception timing control section 125, and an information storage section 127.
The carrier sense control unit 123 sets and controls at what timing carrier sense is performed for each channel (frequency) to be used. Transmission / reception timing controller 12
5 sets and controls at what timing the public control carrier intermittently transmitted from the public base station CS is received and the self-operated control carrier is transmitted to the self-operated terminal PS at the main timing. The information storage unit 127 stores device information unique to the wireless relay device HA, and the unique device information is an identification ID, a call code, and the like.

Next, the operation of the wireless relay device HA of the present embodiment will be described with reference to FIG. FIG. 2 is a timing chart illustrating timing control of intermittent transmission and reception of a control carrier performed during a standby operation in the wireless relay device HA of the present embodiment. 2A is a public base station CS, FIG. 2B is a wireless relay device HA, FIG.
(C) is a private terminal PS, and shows reception on the upper side and transmission on the lower side.

In the radio relay device HA and the radio relay method according to the present embodiment, a period from the timing (t1) of receiving one public control carrier from the public base station CS to the timing (t4) of receiving the next public control carrier. The self-controlled carrier is transmitted to the self-operated terminal twice, and the transmission / reception timing control unit 125 (timing control step) first transmits the self-controlled carrier to the self-operated terminal PS using the first channel (first frequency). One transmission timing is
From the reception timing of the public control carrier, the wireless relay device H
The second transmission timing for setting the distribution in a random manner with the device information unique to A and transmitting to the private terminal PS using the first channel (first frequency) starts from the first transmission timing and is unique to the wireless relay device HA. Generated based on device information.

That is, in FIG. 2, when a public control carrier from the public base station CS is received at timing t1,
The first transmission timing t2 is set by the transmission / reception timing control unit 125 with reference to the device information (identification ID, call code, etc.) in the information storage unit 127. That is, at the first transmission timing t2 which is delayed from the timing t1 by the interval T1 based on the identification ID or the like, the first channel (first frequency)
To transmit a self-controlled carrier from the radio unit 103 to the self-operated terminal PS.

Next, the transmission / reception timing control section 125
The second transmission timing starting from the first transmission timing t2 is generated with reference to the device information (identification ID, call code, etc.) in the information storage unit 127 again. That is, the second time delayed from the timing t2 by the interval T2 based on the identification ID or the like.
At the transmission timing t3, the wireless unit 103 transmits the private control carrier to the private terminal PS using the second channel (second frequency).

In the specific example of FIG. 2, the first transmission timing t
2, the transmission and reception of the private control carrier is performed. Even if the transmission of the private control carrier at the first transmission timing t2 collides with another wireless relay apparatus and mutual interference occurs, another second transmission is performed. Since the transmission of the self-controlled carrier is performed at the timing t3, the number of variances of the transmission timing can be increased more than before, and the interference between the wireless relay devices can be avoided more reliably.

[Second Embodiment] Next, the radio relay apparatus according to the second embodiment is similar to the radio relay apparatus according to the first embodiment shown in FIG.
Is provided. FIG. 3 is a timing chart illustrating timing control of intermittent transmission / reception of a control carrier performed when mutual interference occurs with another wireless relay device during a standby operation of the wireless relay device HA of the present embodiment. It is. That is, FIGS. 3 (a), (b),
(C) is the first, second, and third wireless relay devices, respectively, and shows reception on the upper side and transmission on the lower side.

In the wireless relay device HA and the wireless relay method of the present embodiment, for example, the first wireless relay device of the present embodiment is to be added to a mobile communication system having the second and third wireless relay devices. In this case, before transmitting the first self-controlled carrier to the self-operated terminal PS, the carrier sense control unit 123 (carrier sense control step)
Carrier pre-transmission sensing is performed at all transmittable transmission timings. The transmission / reception timing control unit 125 (timing control step) transmits a self-controlled carrier to the self-operated terminal PS at the timing t6 when mutual interference with the second and third wireless relay devices does not occur based on the result of the carrier sense before transmission. Start sending.

As described above, before transmitting the first communication control information to the private terminal PS, the pre-transmission carrier sense is performed,
Since the private control carrier is transmitted to the private terminal PS at a timing without interference waves, interference can be avoided from the first transmission of the private control carrier.

[Third Embodiment] Next, the radio relay apparatus according to the third embodiment has the configuration shown in FIG. 1 as in the first embodiment. FIG. 4 is a timing chart illustrating timing control of intermittent transmission / reception of a control carrier performed during a standby operation in the wireless relay device HA of the present embodiment, where reception is shown on the upper side and transmission is shown on the lower side.

In the radio relay device HA and the radio relay method according to the present embodiment, the transmission of the private control carrier to the private terminal PS is started and then periodically (t11, t2) at predetermined intervals.
At 1, t31, t41), the transmission of the private control carrier to the private terminal PS is thinned out, and the presence or absence of an interference wave is measured by the reception electric field strength measuring unit 115 or the like. For example, when an interference wave (mutual interference) is detected as a result of the interference detection at the timing t21, the carrier sense control unit 123 (carrier sense control step) performs the timing t21.
From t to t31, carrier sense is performed at all transmittable transmission timings. Next, the transmission / reception timing control unit 1
In 25 (timing control step), transmission of the self-controlled carrier to the self-operated terminal PS is restarted at the reset timing without interference wave based on the result of the carrier sense.

As described above, in the present embodiment, even after transmitting the first privately-owned control carrier to the privately-owned terminal PS, the transmission of the privately-owned control carrier is periodically thinned out at predetermined intervals to detect the mutual interference. Is detected, carrier sense is performed, and the self-controlled carrier is transmitted to the self-operated terminal PS at the reset timing without interference waves, so that interference can be avoided and interference occurs as in the related art. In such a case, the problem that the call is missed without the user noticing is solved.

[Fourth Embodiment] Next, a radio relay apparatus according to a fourth embodiment has the configuration shown in FIG. 1 as in the first embodiment. FIG. 5 is an explanatory diagram exemplifying a result of carrier sense in the wireless relay device of the present embodiment for each timing.

In the radio relay apparatus HA and the radio relay method of the present embodiment, the carrier sense control section 123 (carrier sense control step) performs carrier sense at all transmittable transmission timings. Next, based on the result of carrier sense, the transmission / reception timing control unit 125 (timing control step) determines that the self-controlled carrier has a low interference level and is closest to the reception timing of the self-controlled carrier transmitted from the public base station. It is transmitted to the private terminal PS. That is, in FIG. 5, the electric field level determination result by the received electric field strength measurement unit 115 is “○”, the interference frequency is zero, and the earliest timing is t2, so the transmission timing of the self-controlled carrier is set to t2. Will be.

The wireless relay device HA always keeps synchronization with the public base station CS, and ± several [μsec] to the private terminal PS.
In order to ensure high-precision synchronization, the operation is performed using a higher-speed clock from the reception timing of the public control carrier transmitted from the public base station CS to the transmission timing of the private control carrier to the private terminal PS. Need
Further, since the current consumption is large, the shorter this interval is, the lower the power consumption of the device can be. Note that the carrier sense method in the present embodiment is based on carrier sense before the start of transmission of the self-controlled carrier as in the second embodiment, or after transmission of the self-controlled carrier as in the third embodiment is started. Can be applied to any of the above carrier senses.

[Fifth Embodiment] Next, a radio relay apparatus according to a fifth embodiment has the configuration shown in FIG. 1 as in the first embodiment. FIG. 6 is an explanatory diagram exemplifying the result of the carrier sense in the wireless relay device of the present embodiment for each timing.

In the radio relay apparatus HA and the radio relay method according to the present embodiment, the carrier sense control section 123 (carrier sense control step) uses the carrier sense control section 123 (carrier sense control step) to transmit all transmittable transmissions to the self-operating terminal PS before starting the transmission. Carrier sense is performed at the timing. Next, in the transmission / reception timing control unit 125 (timing control step), as a result of the carrier sense, when there is no timing with no interference wave, the self-owned The control carrier is transmitted to the private terminal PS. That is, in FIG. 6, since the electric field level determination result by the received electric field strength measuring unit 115 does not have the timing of “○”, the interference frequency is equal to or longer than a predetermined interval (in FIG. 6, over two timings). In this case, since the timing of “1”) is t1, the transmission timing of the self-controlled carrier is set to t1.

As described above, in the present embodiment, when there is no timing with no interference wave as a result of the carrier sensing, a timing with a low frequency of occurrence of mutual interference within a predetermined interval or more is selected. Since the private control carrier is transmitted to the private terminal PS, even in an environment where a large number of public base stations CS and other wireless relay devices are present, the transmission timing is completely used by other wireless relay devices and the like. Thus, the problem that transmission cannot be performed does not occur.

[0058]

As described above, according to the wireless relay device, the wireless relay method, and the recording medium of the present invention, a plurality of timings for transmitting communication control information to the private terminal by the timing control means (timing control step). Is generated, another transmission timing is generated based on the device information unique to the wireless relay device, starting from the transmission timing of the predetermined communication control information, so that the transmission of the communication control information at one transmission timing is assumed. However, even if the wireless communication device collides with another wireless relay device and causes mutual interference, the transmission of communication control information is performed at another transmission timing. Interference between devices can be avoided more reliably.

According to the present invention, before transmitting the first communication control information to the private terminal, carrier sense control means (carrier sense control step) performs carrier sense at all transmittable transmission timings, The timing control means (timing control step) causes the communication control information to be transmitted to the private terminal at a timing without interference waves based on the result of the carrier sense (carrier sense control step). Can be avoided.

Further, according to the present invention, after the first communication control information is transmitted to the private terminal, the transmission of the communication control information to the private terminal is periodically thinned out at a predetermined interval (by the interference detection step). When interference is detected and mutual interference is detected as a result of the detection (interference detection step), carrier sense is performed at all transmittable transmission timings by carrier sense control means (carrier sense control step). In the control means (timing control step), based on the result of the carrier sense (carrier sense control step), the communication control information is transmitted to the private terminal at reset timing without interference waves, so that interference can be avoided. At the same time, as in the conventional case, if the user is unaware that an incoming call is missed when interference is occurring, it is likely that the user will miss the incoming call. Problem is solved.

Further, according to the present invention, carrier sense is performed at all transmittable transmission timings by the carrier sense control means (carrier sense control step). Based on the result of the carrier sense control step), the communication control information is transmitted to the private terminal at a timing with a low interference level and closest to the reception timing of the communication control information transmitted from the public base station, so that interference can be avoided and In addition, the power consumption of the device can be reduced.

Further, according to the present invention, the carrier sense control means (carrier sense control step) performs carrier sense at all transmittable transmission timings before transmitting the first communication control information to the private terminal, In the timing control means (timing control step), as a result of the carrier sense (carrier sense control step), when there is no timing with no interference wave, the timing of the occurrence of mutual interference for a predetermined interval or more is low. However, since the communication control information is transmitted to the private terminal, even in an environment where a large number of public base stations and other wireless relay devices are present, the transmission timing is completely used by other wireless relay devices and the like. The problem that transmission is not possible does not occur.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless relay device according to a first embodiment of the present invention.

FIG. 2 is a timing chart illustrating timing control of intermittent transmission / reception of a control carrier performed during a standby operation in the wireless relay device of the first embodiment.

FIG. 3 is a timing chart illustrating timing control of intermittent transmission / reception of a control carrier performed when mutual interference occurs with another wireless relay device during a standby operation of the wireless relay device according to the second embodiment; It is.

FIG. 4 is a timing chart illustrating timing control of intermittent transmission / reception of a control carrier performed during a standby operation in a wireless relay device according to a third embodiment.

FIG. 5 is an explanatory diagram exemplifying a result of carrier sense in a wireless relay device according to a fifth embodiment for each timing;

FIG. 6 is an explanatory diagram exemplifying a result of carrier sense in a wireless relay device according to a sixth embodiment for each timing.

FIG. 7 is a configuration diagram illustrating the concept of a mobile communication system using a wireless relay device.

FIG. 8 is a timing chart illustrating the relay timing of a communication channel by a conventional wireless relay device.

FIG. 9 is a timing chart illustrating timing control of intermittent transmission performed during a conventional standby operation.

FIG. 10 is a timing chart illustrating timing control of intermittent transmission performed when mutual interference occurs with another wireless relay device during a standby operation.

[Explanation of symbols]

 CS public base station HA radio relay device PS private terminal 101 antenna 103 radio unit 105 radio control unit 107 TDMA processing unit 109 control unit 115 reception electric field strength measurement unit 121 transmission power control unit 123 carrier sense control unit 125 transmission / reception timing control unit 127 information Memory

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) FF26 GG14 GG25

Claims (11)

[Claims] 1. A wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, comprising: a plurality of wireless relay devices for transmitting communication control information to the private terminal; A wireless relay device having timing control means for generating another transmission timing based on device information unique to the wireless relay device, starting from a transmission timing of predetermined communication control information when generating the timing. 2. A wireless relay apparatus for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, wherein first wireless communication control information is transmitted to the private terminal. A carrier sense control unit that performs carrier sense at all transmittable transmission timings, and a timing control unit that transmits the communication control information to the self-service terminal at a timing without interference waves based on a result of the carrier sense. And a wireless relay device comprising: 3. A wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, wherein first wireless communication control information is transmitted to the private terminal. Later, at regular intervals, the transmission of communication control information to the private terminal is thinned out to detect mutual interference. As a result of the detection, when mutual interference is detected, the carrier is transmitted at all transmittable transmission timings. Radio communication, comprising: carrier sense control means for performing sensing; and timing control means for transmitting the communication control information to the private terminal at reset timing without interference waves based on the result of the carrier sense. Relay device. 4. A wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, wherein carrier sense is performed at all transmittable transmission timings. Carrier sense control means, based on a result of the carrier sense, a timing at which communication control information is transmitted to the private terminal at a timing having a low interference level and a timing closest to a reception timing of communication control information transmitted from the public base station. And a control unit. 5. A wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, wherein first wireless communication control information is transmitted to the private terminal. A carrier sense control means for performing carrier sense at all transmittable transmission timings; and an interference in which mutual interference occurs for a predetermined interval or more when there is no interference-free timing as a result of the carrier sense. And a timing control means for transmitting the communication control information to the private terminal at a low frequency. 6. A wireless relay method for a wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) method, wherein communication control information is transmitted to the private terminal. When generating a plurality of transmission timings, there is provided a timing control step of generating another transmission timing based on device information specific to the wireless relay apparatus, starting from a transmission timing of predetermined communication control information. Relay method. 7. A wireless relay method for a wireless relay apparatus for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) method, wherein the first communication control information is stored in the private private terminal. Before transmitting to the terminal, a carrier sense control step of performing carrier sense at all transmittable transmission timings, and based on a result of the carrier sense control step, the communication control information is transmitted to the self-operating terminal at a timing without interference waves. And a timing control step of transmitting to a wireless relay device. 8. A wireless relay method for a wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) system, wherein the first communication control information is stored in the private private terminal. After transmitting to the terminal, an interference detection step of detecting mutual interference by thinning out the transmission of the communication control information to the private terminal periodically at predetermined intervals, as a result of the interference detection step, when mutual interference is detected A carrier sense control step of performing carrier sense at all transmittable transmission timings, and a timing of transmitting the communication control information to the private terminal at a reset timing without interference waves based on a result of the carrier sense control step. And a control step. 9. A wireless relay method of a wireless relay device for relaying wireless communication between a public base station and a private terminal by using a time division multiplex communication (TDMA) method, wherein the wireless relay device performs transmission at all transmittable transmission timings. A carrier sense control step of performing carrier sense, and based on a result of the carrier sense control step, the communication control information is transmitted at a timing closest to a reception timing of communication control information transmitted from the public base station with a low interference level. A timing control step of transmitting a signal to a self-employed terminal. 10. A wireless relay method of a wireless relay device for relaying wireless communication between a public base station and a private terminal using a time division multiplex communication (TDMA) method, wherein the first communication control information is stored in the private relay terminal. Before transmitting to the terminal, a carrier sense control step of performing carrier sense at all transmittable transmission timings, and as a result of the carrier sense control step, when there is no interference-free timing, during a predetermined interval or more A timing control step of transmitting the communication control information to the private terminal at a timing when the frequency of occurrence of mutual interference is low. 11. A computer-readable recording medium storing a program for causing a computer to execute the wireless relay method according to claim 6, 7, 8, 9, or 10.