JP2002369245A - Radio communication system and method for deciding radio frame constitution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system for deciding on the constitution of a radio frame, so as to alleviate influence due to interference between a first radio means and a second radio means for transmitting and receiving a radio signal by using a radio frame of a time division multiplex system. SOLUTION: The radio communication system comprises the first radio means 211 , a second radio means 212 , a first function calculating means 221 for calculating a first function F1 (t) which indicates the constitution of the radio frame used in the means 211 , a second function calculating means 222 for calculating a second function F2 (t) indicating a constitution of the radio frame capable of being used in the means 211 , a correlation function calculating means 223 for calculating the time correlation function between the first function F1 (t) and the second function F2 (t), and a radio frame constitution deciding means for deciding the constitution of the radio frame used in the second means 212 , in response to the correlation function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for determining the configuration of a radio frame used for radio communication between a radio terminal, a radio base station, and a radio relay apparatus in a radio communication system.

[0002]

2. Description of the Related Art As shown in FIG.₁No
To 10_nAnd the wireless relay device 20 and the wireless base station 30
The wireless relay device 20 and the wireless base station
30 and "IMT2000 / TDD (Int
electronic Mobile Telecom
munications-2000 / Time Div
wireless transmission using the “Ision Duplex” method
Device 20 and wireless terminal 10 ₁To 10_nTo communicate with
"PHS (Personal Handy Phone
e) A wireless communication system using the "" method is known.

[0003] In this conventional wireless communication system, the radio relay device 20, to the radio terminal 10 ₁ to 10 _n and the radio base station 30 are connected by radio channels, specifically, the first radio device 21 ₁ When the second wireless device 21 ₂ and the control unit 22
And The wireless base station 30 is connected to the wireless relay device 20 via a wireless channel, and is also connected to a wireless control station, an IMT2000 / TDD network, and the like.

FIG. 15 is a diagram showing the configuration of a radio frame in this conventional radio communication system, that is, the allocation of radio time slots. 15A and 15B show a wireless frame configuration in wireless communication (IMT2000 / TDD system) between the wireless base station 30 and the wireless relay device 20, and FIG. FIG. 4B shows a radio frame configuration on the base station 30 side, and FIG. 4B shows a radio frame configuration on the radio relay device 20 side. (C) and (d) show a wireless frame configuration in wireless communication (PHS method) between the wireless terminal 10 and the wireless relay device 20, and (c) shows the wireless relay device 2
0 side of the shows the radio frame structure, (d) shows a radio frame structure of the radio terminal 10 ₁ to 10 _n side.

[0005] In FIG. 15 (a), 40 _1, the radio relay device 20 from the wireless base station 30 upstream of the communication time slot (uplink slot or IMT2000 / TD
D is up slot), 50 ₁ to 50 _3, downlink communication time slot from the wireless base station 30 to the radio relay device 20 (downlink slot or IMT2000 / TD
D downlink communication slot), and 80 is the radio base station 30
Control signal time slot (downlink control slot or IMT2000 / TD
D downlink control slot).

[0006] In FIG. 15 (b), 41 _1, the radio relay device 20 from the wireless base station 30 upstream of the communication time slot (uplink slot or IMT2000 / TD
D is up slot), 51 ₁ to 51 _3, downlink communication time slot from the wireless base station 30 to the radio relay device 20 (downlink slot or IMT2000 / TD
D downlink communication slot), and 81 is a radio base station 30
Control signal time slot (downlink control slot or IMT2000 / TD
D downlink control slot).

[0007] In FIG. 15 (c), 60 ₁ to 60 ₄
Is a wireless relay device 20 from the wireless terminal 10 ₁ through to 10 _n downlink communication time slot (downlink slot or PHS downlink slots), 70 ₁ to 70 _4, the radio from the radio terminal 10 ₁ to 10 _n An uplink communication time slot to the relay device 20 (uplink slot or PHS
(Up slot).

[0008] In FIG. 15 (d), 61 ₁ to 61 ₄
Is a wireless relay device 20 from the wireless terminal 10 ₁ through to 10 _n downlink communication time slot (downlink slot or PHS downlink slots), 71 ₁ to 71 _4, the radio from the radio terminal 10 ₁ to 10 _n An uplink communication time slot to the relay device 20 (uplink slot or PHS
(Up slot).

In the IMT2000 / TDD system, one radio frame is composed of 15 time slots, and the length of one radio frame is 10 ms.
In the IMT2000 / TDD system, the radio base station 30
Uplink slots 40 and 41, downlink slots 50 and 51, and control signal slots 80 and 81 can be freely assigned. In the PHS method, one radio frame is composed of eight time slots, and one radio frame has a long time of 5 ms.

FIG. 16 is a time chart showing a method for determining the configuration of a radio frame in this conventional radio communication system. FIG. 16A shows the wireless base station 30.
Wireless communication (IMT2000) between the
/ TDD method), a method for determining the configuration of a radio frame is shown, and FIG.
0 and wireless communication between the wireless relay device 20 (PHS method)
Shows a method for determining the configuration of a radio frame.

[0011] As shown in FIG.
1, the radio base station 30 determines that the downlink control slot 80
It transmits a control signal via a first radio device 21 ₁ in the radio relay device 20 via the downlink control slot 81 for receiving the control signal. In step 902, the control unit 22 of the wireless relay device 20 performs wireless communication at the same timing as the wireless frame of the wireless base station 30 according to the information on the wireless frame configuration of the wireless base station 30 included in the received control signal. A wireless frame for wireless communication with the wireless base station 30 is configured to transmit and receive signals. For example, when the radio frame on the radio base station 30 side has the configuration illustrated in FIG.
The configuration is as shown in FIG.

As shown in FIG.
In 1, the control unit 22 of the wireless relay device 20 forms a wireless frame for wireless communication with the wireless terminal 10. The control unit 22 of the wireless relay device 20 configures a wireless frame for wireless communication with the wireless terminal 10 independently of the wireless frame for wireless communication with the wireless base station 30 described above. For example, FIG. 16B illustrates the control unit 22 of the wireless relay device 20.
However, in this example, a wireless frame for wireless communication with the wireless terminal 10 is configured to transmit and receive wireless signals at the same timing as a wireless frame for wireless communication with the wireless base station 30 (FIG. 15B). is there. In step 912, the second radio 21 ₂ of the radio relay apparatus 20, the downlink slot 60
₁ through 60 ₄ transmits a control signal to the radio terminal 10, the radio terminal 10, via the downlink slot 61 ₁ through 61 ₄ receives the control signal. In step 913, the wireless terminal 10 transmits and receives the wireless signal at the same timing as the wireless frame on the wireless relay device 20 according to the information related to the wireless frame configuration on the wireless relay device 20 included in the received control signal. Next, a wireless frame for wireless communication with the wireless relay device 20 is configured.

Further, as shown in FIG.
Communication system (PHS wireless terminal 10b ₁, PHS radio base
Station 20b, PHS network) and IMT2000 / T
DD wireless communication system (IMT2000 / TDD wireless terminal
End 10a₁, IMT2000 / TDD radio base station 20
a, IMT2000 / TDD network)
Wireless communication systems are also known.

FIG. 18 is a diagram showing the configuration of a radio frame in the conventional radio communication system, that is, the allocation of radio time slots. In FIG. 18, (a)
Is an IMT2000 / TDD radio base station 20a and an IMT
2000 / TDD a radio frame structure for wireless communication between the wireless terminal 10a _1, IMT2000 / TDD
2 shows a wireless frame configuration on the wireless base station 20a side. Further, in FIG. 18, (b) is a radio frame structure for wireless communication between the PHS radio base station 20b and the PHS radio terminal 10b _1, PHS radio base station 20b
2 shows a wireless frame configuration on the side.

In FIG. 18A, 40a₁Is IM
T2000 / TDD wireless terminal 10a ₁From IMT200
0 / tie for uplink communication to TDD radio base station 20a
Time slot (IMT2000 / TDD uplink slot)
Yes, 50a₁To a50₃Is IMT2000 / TD
D wireless base station 20a to IMT2000 / TDD wireless terminal
Communication time slot (IMT)
2000 / TDD downlink communication slot) and 80a
From the IMT2000 / TDD radio base station 20a
Downlink control to T2000 / TDD wireless terminal 10a
Signal time slot (IMT2000 / TDD downlink control
Slot).

In FIG. 18B, 60a _{1 to} 60a
a ₄ is the PHS wireless terminal 1 from the PHS wireless base station 20b.
0b ₁ is a communication time slot for downlink (PHS downlink slot), and 70a _{1 to} 70a ₄ are PHS
From the wireless terminal 10b ₁ is a PHS wireless base station uplink communication time slots to 20b (PHS uplink slots).

IMT2000 / TDD radio base station 20a
Of wireless time slots for wireless communication (determination of a wireless frame configuration) between the PHS wireless base station 20b and the PHS wireless terminal 10b ₁ and wireless communication between the PHS wireless terminal 10b ₁ and the IMT 2000 / TDD wireless terminal 10a ₁ Time slot assignment (determination of the radio frame configuration) is performed independently.

[0018]

However, the former,
That is, in the wireless communication system illustrated in FIG. 14, the wireless relay device 20 determines a wireless frame configuration for wireless communication with the wireless terminal 10 and determines a wireless frame configuration for wireless communication with the wireless base station 30. since the separately carried out, there is a problem that another potentially interfering radio signals occurs between the first radio device 21 ₁ and the second radio device 21 _2.

[0019] For example, the first radio device 21 _1, while sending a radio signal to the radio base station 30 via the uplink slots 41 _1, the second radio 21 _2, up slot 70 ₁ to 70 ₄ When a wireless signal is received from the wireless terminal 10 via the wireless relay device 20, the wireless frequency used between the wireless relay device 20 and the wireless base station 30 and the wireless frequency used between the wireless relay device 20 and the wireless terminal 10 and frequency, if using the same frequency band, radio signals received by the second wireless device 21 _2, especially in the uplink slots 70 _3, the first
Receiving the influence of interference from the radio signals transmitted by the radio device 21 _1, the error characteristics are deteriorated. Here, the radio frequency used between the radio relay device 20 and the radio base station 30 and the radio frequency used between the radio relay device 20 and the radio terminal 10 use different frequency bands. even if there are, the received power of the second wireless device 21 _{and second} radio signals transmitted by the first radio device 21 _1, the second wireless device 21 ₂ of the radio signals transmitted by the wireless terminal 10 if much greater than the received power, error characteristics of the radio signals received by the second wireless device 21 _2, there is a problem that the deterioration by the receiving desensitization phenomena. Furthermore, the out-of-band noise of the radio signal transmitted by the second wireless device 21 _2, the error characteristic of the first radio device 21 _1, there is also a problem that deteriorates.

[0020] Conversely, the second wireless device 21 _2, when transmitting a radio signal to the radio terminal 10 via the downlink slot 60 ₁ to 60 _4, the radio signals received by the first radio device 21 _1, In particular, control slot 81 and downlink slot 51
In ₁ and 51 _2, the influence of interference from the radio signal transmitted by the second wireless device 21 _1, there is a problem that error characteristic is degraded.

The latter, ie, the radio shown in FIG.
In a communication system, an IMT2000 / TDD radio base station
When 20a and the PHS radio base station 20b are adjacent,
When the radio 21b of the PHS radio base station 20b is
Slot 60a₁To 60a ₄PH wireless signal through
S wireless terminal 10b₁While transmitting to IMT2000 /
The radio 21a of the TDD radio base station 20a is
00 / TDD upstream slot 40a₁Via IMT20
00 / TDD wireless terminal 10a₁Receiving wireless signals from
And the IMT2000 / TDD wireless terminal 10a₁Nothing from
The line signal is the IMT2000 / TDD radio base station 20a.
IMT2000 / TDD upstream slot 40a₁smell
And transmitted by the radio 21b of the PHS radio base station 20b
Problem of being affected by interference from radio signals
There is. Also, the IMT2000 / TDD radio base station 20
a of the wireless device 20a is IMT2000 / TDD downlink communication
Slot 50a₁To 50a₃IM wireless signal through
T2000 / TDD wireless terminal 10a₁While sending to
The radio 21b of the PHS radio base station 20b is
Slot 70a₁To 70a₄PHS wireless terminal via
10b₁Receives a wireless signal from the PHS wireless terminal 1
0b₁From the PHS radio base station 20b
HS upstream slot 70a₁To 70a₄In, IM
Sent by T2000 / TDD radio base station 20a
There is a problem that it is affected by interference from wireless signals.
You.

Further, the PHS radio terminal 10b₁And IMT
2000 / TDD wireless terminal 10a₁Exists adjacent to
The PHS wireless terminal 10b₁But PHS
Up slot 70a₁To 70a₄Over PHS wireless
While transmitting to base station 20b, IMT2000 / TDD
Wireless terminal 10a₁But IMT2000 / TDD downlink communication
Slot 50a₁To 50a₃Via IMT2000
/ Receives radio signal from TDD radio base station 20a
And the IMT2000 / TDD wireless terminal 10a₁Received by
The received wireless signal is transmitted to the PHS wireless terminal 10b.₁Sent by
The problem of being affected by interference from received radio signals
There is a point. Here, the IMT2000 / TDD wireless terminal 1
0a₁Is the IMT2000 / TDD uplink slot 40a
₁To the IMT2000 / TDD radio base station 20a via
While transmitting the radio signal, the PHS radio terminal 10b₁But,
PHS downlink slot 60a₁To 60a₄PH through
Receives a radio signal transmitted by S radio base station 20b
Then, the PHS wireless terminal 10b ₁Radio signals received by
Is IMT2000 / TDD wireless terminal 10a₁By
Question of interference from transmitted radio signals
There is a point.

PHS wireless communication system and IMT2000
/ TDD radio communication system uses different radio frequency bands, but when the distance between radio terminals and radio base stations is small, mutual interference may occur due to out-of-band noise in each radio communication system. There is a problem that there is.

Accordingly, the present invention has been made in view of the above points, and has been made in the wireless communication between a wireless relay apparatus and a wireless base station and in wireless communication between a wireless relay apparatus and a wireless terminal. An object of the present invention is to provide a radio communication system and a radio frame configuration determination method capable of configuring a radio frame so as to reduce interference. The present invention also relates to a radio communication between a PHS radio terminal and a PHS radio base station, and to an IMT2000 / TDD radio terminal and an IMT20
It is an object of the present invention to provide a wireless communication system and a wireless frame configuration determining method capable of configuring a wireless frame so as to reduce mutual interference in wireless communication with a 00 / TDD wireless base station.

[0025]

SUMMARY OF THE INVENTION A radio communication system and a radio frame configuration determining method according to the present invention perform radio communication using a time division multiplex radio frame. First and second wireless means for transmitting and receiving wireless signals using the first and second function means, and first function calculating means for calculating a first function indicating a configuration of a wireless frame used in the first wireless means When,
Second function calculating means for calculating a second function indicating a configuration of a radio frame that can be used in the second wireless means, and a correlation between the first function and the second function A correlation function calculating means for calculating a correlation function indicating: and optimizing a configuration of a radio frame that can be used in the second radio means according to the correlation function. Wireless frame configuration determining means for determining a configuration of a wireless frame to be used.

According to the radio communication system and the radio frame configuration determining method according to the present invention, the radio frame configuration determining unit determines the correlation function based on the configuration of the radio frame used by the first radio unit and the second radio unit. Since the configuration of the wireless frame is determined according to the correlation function calculated by the calculating means, it is possible to reduce the influence of interference between the first wireless means and the second wireless means.

In the above-described radio communication system and radio frame configuration determination method, the first function takes a predetermined value in accordance with the allocation of a time slot in a radio frame used in the first radio means. The second function takes a predetermined value in accordance with the allocation of time slots in a radio frame that can be used in the second radio means, and the correlation function is the first function. It shall indicate the temporal correlation between the function and the second function, and the optimization of the configuration of the radio frame that can be used in the second radio means is dependent on the value of the correlation function , By delaying the timing of the radio frame.

In this case, the radio frame configuration determining means:
In order to determine the configuration of the radio frame by delaying the timing of the radio frame according to the above-described correlation function, only the time slot allocation within the radio frame used by the first radio means and the second radio means is determined. Based on this, it is possible to easily reduce the influence of mutual interference between the first wireless means and the second wireless means.

In the above-described radio communication system and radio frame configuration determination method, the second radio means may use the first radio means as a time slot for transmitting the radio signal in the determined radio frame. A time slot having a period during which the wireless signal is not received is preferentially selected, and the first wireless unit transmits the wireless signal as a time slot for receiving the wireless signal in the determined wireless frame. It is preferable to preferentially select a time slot having a period during which transmission is not performed.

In this case, the second wireless means selects a time slot for transmitting and receiving a radio signal in accordance with the timing for transmitting and receiving the radio signal by the first radio means.
It is possible to further reduce the influence of mutual interference between the first wireless means and the second wireless means.

In the above-described radio communication system and radio frame configuration determining method, the radio relay device relays a radio signal between the radio terminal and the radio base station, and the radio relay device includes: a first radio unit; It is preferable to include a second wireless unit, a first function calculating unit, a second function calculating unit, a correlation function calculating unit, and a wireless frame configuration determining unit.

In this case, the radio frame configuration determining means:
Since the wireless relay apparatus is provided in the wireless relay apparatus, a wireless signal transmitted / received between the wireless relay apparatus and the wireless terminal via the second wireless means transmits the first wireless signal between the wireless relay apparatus and the wireless base station. The effect of interference from wireless signals transmitted and received via the means can be reduced.

In the above-described radio communication system and radio frame configuration determining method, the first radio terminal and the first radio base station perform radio communication, and the second radio terminal and the second radio base station perform radio communication. Perform communication, and the first wireless base station communicates with the first
Wireless means, and a first function calculating means, wherein the second wireless base station comprises a second wireless means, a second function calculating means, a correlation function calculating means, and a wireless frame configuration determining means. It is preferable to have the following.

In this case, the radio frame configuration determining means:
Since the wireless signal is provided in the second wireless base station, the wireless signal transmitted and received between the second wireless base station and the second wireless terminal via the second wireless means is transmitted to the first wireless base station. It is possible to reduce the influence of interference from wireless signals transmitted and received between the first wireless terminal and the first wireless terminal via the first wireless means. Therefore, for example, the wireless communication between the first wireless base station and the first wireless terminal is performed by the PHS method, and the wireless communication between the second wireless base station and the second wireless terminal is performed according to the IMT20.
When the communication is performed by the 00 / TDD method, the influence of mutual interference can be reduced in each wireless communication.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Configuration of Wireless Communication System According to Embodiment) An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram illustrating a wireless communication system according to the present embodiment.

As shown in the figure, a wireless communication system according to this embodiment includes a radio terminal 10 ₁ to 10 _n, the radio relay device 20, and a radio base station 30, the radio relay device 20 The communication between the radio base station 30 and the radio relay station 2 is performed using the IMT2000 / TDD method.
0 and communication between the wireless terminal 10 ₁ to 10 _n is to use a PHS system.

The radio relay device 20, specifically, the first radio device 21 _1, the second wireless device 21 _2, the function _F 1 (t) determining unit 22 _1, the function _F 2 (t) determining unit 22 has a _2, a time correlation function calculating unit 22 _3, and a radio frame determining unit 22 _4. Function _F 1 (t) determining unit 22 ₁ and the function _F 2 (t)
A decision unit ₂₂₂ and the time correlation function calculating unit 22 ₃ and the radio frame determining unit 22 ₄ constitutes a control unit 22.

The first radio device 21 _1, the function _F 1 (t) is connected to the determining unit 22 _1, the radio base station 30 via the IMT2000 / TDD scheme of a radio channel (radio frame time-division multiplexing) This is a first wireless means for performing wireless communication with the wireless communication device. The first radio device 21 ₁ recognizes the configuration of the radio frame of the radio base station 30 shown in the control signal from the wireless base station 30 received the same configuration as the recognized radio frame, the radio base station 30 to form a wireless frame for wireless communication.

Second radio 21₂Is the function F₂(T) Determination
Part 22₂And radio frame determination unit 22 ₄Connected to
PHS wireless channel (time division multiplex wireless
Wireless communication with the wireless terminal 10 via the
This is the second wireless means.

Function F₁(T) Determination unit 22₁Is the first radio
Machine 21₁And time correlation function calculator 22 ₃Connected to
The first wireless device 21₁Base station 30 recognized by
Of the wireless frame for wireless communication with the
Radio 21₁The configuration of radio frames used in
Based on the function F described below,₁First to determine (t)
Function calculation means.

Function F₂(T) Determination unit 22₂Is the second radio
Machine 21₂And time correlation function calculator 22 ₃Connected to
The second radio 21₂And between the wireless terminal 10
Based on the configuration of the radio frame that can be
Function F to be described₂In the second function calculating means for determining (t)
is there.

The time correlation function calculating unit 22 _3, the function F
₁ (t) is connected to a decision unit 22 ₁ and the function _F 2 (t) determining unit ₂₂₂ and the radio frame determining unit 22 _4, the function F
₁ (t) determining unit 22 ₁ functions as determined by _F 1 (t)
If, on the basis of the function _F 2 (t) determining unit 22 ₂ functions _F 2 determined by (t), the function _F 1 (t) and the function F
₂ (t), a time correlation function ∫F ₁ (t) × F ₂ (t−τ) dt, which indicates a temporal correlation, is calculated, and a value of τ according to the value of the time correlation function is calculated. It is a correlation function calculating means for calculating.

The radio frame determining unit 22 ₄ is connected to the second radio device 21 ₂ and the time correlation function calculating unit 22 _3, according to the value of τ is calculated by the time correlation function calculating unit 22 _3, by optimizing the structure of a wireless frame used in wireless communication between the second radio device 21 ₂ and the radio terminal 10, radio frame configuration determination for determining the configuration of a radio frame used in the second radio 21 ₂ Means.

(Method for Determining Configuration of Radio Frame in Radio Communication System According to this Embodiment) In the radio communication system having the above configuration, a radio frame for radio communication between the radio relay apparatus 20 and the radio terminal 10 is used. The method of determining the configuration can be implemented according to the following procedure. FIG. 2 is a flowchart showing an operation in which the wireless relay device 20 determines a configuration of a wireless frame for wireless communication with the wireless terminal 10 so as not to be affected by interference due to wireless communication with the wireless base station 30. .

In FIG. 2, when the radio relay apparatus 20 searches for the radio base station 30 at the time of activation,
This operation is started, for example, when a change in the configuration of the wireless communication wireless frame is detected (step A0). In step A1, the first wireless device 21 of the wireless relay device 20
₁ receives a control signal from the wireless base station 30 via the IMT2000 / TDD wireless channel, and recognizes the wireless frame configuration of the wireless base station 30 indicated by the control signal.

[0046] FIG. 3 (a), the wireless communication between the first radio device 21 the radio base station 30 is recognized by _one and the radio relay device 20 of the radio relay apparatus 20 in step A1 (IM
2 shows a configuration of a wireless frame on the wireless base station 30 side in the T2000 / TDD system). In the IMT2000 / TDD scheme, a radio frame is a TDD (Time Div
The radio base station 30 and the radio relay device 20 have 15 radio time slots per radio frame configuration. Each time slot is called an IMT first time slot, an IMT second time slot,..., An IMT fifteenth time slot. Each time slot is an uplink communication time slot (uplink slot or IMT2000 / TD
D uplink slot), a downlink communication time slot (downlink slot or IMT2000 / TDD downlink communication slot), or an unused time slot. Here, the radio frame for a long time is a Tf _1. In FIG. 3 (a), 40 ₁ is up slot (IMT2000 / TD from the radio relay apparatus 20 to the radio base station 30
D is uplink slot), 50 ₁ to 50 _3, the downlink slot from the radio base station 30 to the radio relay device 20 (IM
T2000 / TDD downlink slot), and 80 is a control signal time slot (downlink control slot or IMT2000 / T) from the radio base station 30 to the radio relay apparatus 20.
DD downlink control slot).

In step A2, the radio relay device 2
The first radio device 21 of 0 ₁ recognized the radio base station 30 of the radio frame (FIG. 3 (a)) and the same structure, the wireless base station 3
A wireless frame configuration for wireless communication with 0 is determined.

FIG. 3B shows the configuration of a radio frame on the side of the radio relay device 20 in the radio communication (IMT2000 / TDD) between the radio base station 30 and the radio relay device 20 configured in step A2. . FIG. 3 (b)
In, 41 ₁ is the uplink slot from the wireless relay device 20 to the radio base station 30 (IMT2000 / TDD uplink slots), 51 ₁ to 51 _3, the radio base station 30
Slot to the wireless relay device 20 from the network (IMT 200
0 / TDD downlink communication slot), and 81 is a control signal time slot (downlink control slot or IMT2000 / TDD) from the radio base station 30 to the radio relay apparatus 20.
Downlink control slot).

In step A3, the radio relay device 20
Function _F 1 (t) determining unit 22 _1, the above-described radio base station 3
The function F ₁ (t) is determined based on the wireless frame configuration for wireless communication with 0 (FIG. 3B). Function F ₁ (t)
It is as follows, which is a first function that takes a predetermined value in accordance with the allocation of time slots in a radio frame used in the first radio device 21 _1.

(I) When the IMT-th slot is an upstream slot, F ₁ (t) = a _i [(i−1) × Tf ₁ / N ₁ ≦
_{t <i × Tf 1 / N} 1] (ii) IMT i-th slot, if a downlink _{slot, F 1 (t) = -a} i [(i-1) × Tf 1 / N 1 <
= T <i × Tf ₁ / N ₁ ] (iii) When the IMT-th slot is unused, F ₁ (t) = 0 [(i−1) × Tf ₁ / N ₁ << =
t <i × Tf ₁ / N ₁ ] The function F ₁ (t) also satisfies the following expression.

F ₁ (t) = F ₁ (t−Tf ₁ ) where Tf ₁ indicates a radio frame long time, and IMT
In the 2000 / TDD system, it is 10 ms. Also, N
₁ is the number of slots per radio frame;
It is 15 in the T2000 / TDD system. a _i is I
This value is determined by the type of signal transmitted and received in the MT-th slot.

FIG. 4 shows a wireless relay device in step A3.
Function F of the unit 20₁(T) Determination unit 22 ₁Determined by
Function F₁(T) is shown. Where a_i= 1.

In step A4, the radio relay device 20
Function _F 2 (t) determining unit 22 _2, the function _F 2 (t) from the configuration of a radio frame that can be used between the second radio device 21 ₂ and the radio terminal 10 of the radio relay device 20 decide.

FIG. 5 shows the wireless terminal 10 and the wireless relay device 20.
Shows a wireless communication of a radio frame that can be used in (PHS system) configuration between the second radio device 21 _2. PHS
In the scheme, a radio frame is transmitted using a TDD (Time Div).
A configuration based on the I.D. Duplex (Ion Duplex) method is used, and the number of radio time slots that can be used between the radio terminal 10 and the radio relay device 20 is eight time slots per radio frame configuration. Each time slot is called a PHS first time slot, a PHS second time slot,..., A PHS eighth time slot. P
HS 1st time slot to PHS 4th time slot are for downlink slot, and PHS 5th time slot to PHS
The HS eighth time slot is allocated for the uplink slot. In FIG. 5, 60 ₁ (61 ₁ ) to 60 ₄ (6
1 ₄₎ is a downlink slot from the radio relay apparatus 20 to the radio terminal _10, 70 1 (71 ₁₎ to ₇₀ 4 (7
1 ₄₎ is uplink slot from the wireless terminal 10 to the radio relay device 20.

[0055] function F _{2 (t)} are as follows, which is a second function that takes a predetermined value in accordance with the assigned time slot in the radio frame that can be used in the second radio 21 _1.

[0056] (i) PHS i-th slot, if an uplink _{slot, F 2 (t) = b} i [(i-1) × Tf 2 / N 2 <=
_{t <i × Tf 2 / N} 2] (ii) PHS i-th slot, if a downlink _{slot, F 2 (t) = -b} i [(i-1) × Tf 2 / N 2 <
= T <i × Tf ₂ / N ₂ ] (iii) When the PHS i-th slot is unused, F ₂ (t) = 0 [(i−1) × Tf ₂ / N ₂ ≦ =
t <i × Tf ₂ / N ₂ ] The function F ₂ (t) also satisfies the following expression.

F ₂ (t) = F ₂ (t−Tf ₂ ) Here, Tf ₂ indicates a radio frame long time, and PHS
In the system, it is 5 ms. Further, _{N 2} is the number of slots per radio frame, the PHS system is 8. b _i is a value determined by the type of signal transmitted and received in the PHS i-th slot.

FIG. 6 shows a wireless relay device in step A4.
Function F of the unit 20₂(T) Determination unit 22 ₂Determined by
Function F₂(T) is shown. Where b_i= 1.

In step A5, the radio relay device 20
Time correlation function calculating unit 22 of the _3, based on a function _F 1 (t) and the function _F 2 (t), the time correlation function [integral] F ₁ (t) ×
Calculate F ₂ (t−τ) dt.

In the wireless communication system according to the present embodiment,
First wireless device 21 of wireless relay device 20 ₁But the up slot
41₁Is transmitting a radio signal to the radio base station 30 via the
The second wireless device 21 of the wireless relay device 20₂But going down
Slot 60₁To 60₄Wireless to the wireless terminal 10 via
When transmitting a signal, and when the first
Radio 21₁Is the down slot 51₁To 51₃Through
While receiving a wireless signal from the wireless base station 30,
Second wireless device 21 of line relay device 20₂But the up slot 7
0₁To 70₄Wireless signal from the wireless terminal 10 via the
When transmitting, the first wireless device 21 of the wireless relay device 20₁When
Second wireless device 21 of wireless relay device 20₂Mutual interference with
Is the least affected.

[0061] Thus, the time correlation function calculating unit 22 ₃ of the radio relay apparatus 20 obtains the value of τ value of the time correlation function described above is minimized. The integration range is from 0 to T. T
Is that when Tf ₁ and Tf ₂ are given by using an arbitrary time T ₀ and arbitrary integers M and N, Tf ₁ = M × T ₀ and Tf ₂ = N × T ₀
, T = K × T ₀ . K is the least common multiple of M and N. If Tf ₁
And Tf ₂ cannot be represented as described above, then T
Is a sufficiently large value as compared with Tf ₁ and Tf _2.

FIG. 7 shows a time correlation function ΔF ₁ (t) × F ₂ (t−τ) dt calculated from F ₁ (t) and F ₂ (t).
Is shown. From FIG. 7, the minimum value of τ is 3.4 ms to 3.9 ms.

In step A6, the radio relay device 20
Radio frame determining unit 22 _4, the transmission and reception timing of radio frames can be used in between the second radio device 21 ₂ and the radio terminal 10 of the radio relay device 20 shown in FIG. 5, it is delayed by a time τ To optimize the radio frame and determine the configuration of a radio frame for radio communication with the radio terminal 10.

FIG. 8 shows the configuration (a) of a wireless frame for wireless communication with the wireless base station 30 configured in step A2 and the wireless terminal 1 determined in step A6.
0 (b) shows the configuration of a wireless frame for wireless communication with the wireless communication device 0. The configuration (b) of the wireless frame for wireless communication with the wireless terminal 10 is delayed by 3.4 ms as compared with the configuration (a) of the wireless frame for wireless communication with the wireless base station 30. I have.

In step A7, the radio relay device 20
The second radio 21₂Is the determined wireless terminal 10₁Or
10_nThe configuration of the wireless frame for wireless communication with
Lot 60₁To 60₄Wireless terminal 1 with a control signal via
0₁To 10_nTell At this time, the wireless relay device 20
The second radio 21₂Transmits a control signal to the wireless terminal 10₁Or
10_nTo be transmitted to downlink slot 60₁To 60
₄Of receiving radio signals from the radio base station 30
Slot 51₁To 51₃And transmission / reception timing overlap
No down slot 60₁To 60₄When
Up slot 70 to be paired₁To 70₄But radio base station
Uplink slot 41 for transmitting a radio signal to 30₁Send and receive
Those that do not overlap in timing are preferentially selected. PH
In the S system, the downlink slot is paired with the PHS i-th slot.
Upstream slot is the PHS (i + 4) th slot.
You. In other words, the second wireless device 21 of the wireless relay device 20
₂Is the determined wireless terminal 10₁To 10_nWireless communication with
Downlink slot 60 in credit radio frame₁To 60₄
Of the time slots for transmitting radio signals
1 radio 21₁Have a period during which no radio signal is received
Time slot to be selected preferentially, and the radio relay device 20
The second radio 21₂Is the determined wireless terminal 10₁Or
10_nUplink slot in radio frame for radio communication with
70₁To 70 ₄Of the times to receive radio signals
As a lot, the first wireless device 21₁Transmits a radio signal
Preferentially select timeslots with periods that do not
You.

[0066] In step A8, the wireless terminal 10 ₁ to 10 _n receives a control signal from the radio relay device 20, in response to the control signal, to configure the same radio frame the radio relay apparatus 20 side of the radio frame Thus, a wireless frame for wireless communication with the wireless relay device 20 is used.

[0067] Wireless terminal 10 ₁ to 10 _n, when performing an outgoing or incoming call, transmits a LCH establishment request signal through the uplink slots 71 ₁ to 71 ₄ to the wireless relay device 20. Here, the uplink slots LCH establishment request signal is transmitted, the control signal by the wireless relay device 20 is up slot paired with the downlink slot 61 ₁ through 61 ₄ are transmitted. The second radio 21 ₂ of the radio relay device 20, in response to LCH establishment request signal, in order to perform wireless terminal 10 ₁ to 10 _n and the wireless communication, and determine the downlink slot and the uplink slot paired, LCH allocation Wireless terminals 10 ₁ through 1
It is sent to the 0 _n. At this time, the second radio 21 ₂ of the radio relay device 20, as a time slot for wireless terminal 10 ₁ to 10 _n and the wireless communication, receives a radio signal from the radio base station 30 by the first radio device 21 ₁ to be those receiving timing and the downlink slots 51 ₁ to 51 ₃ are not overlapped, up slot 70 ₁ to 70 ₄ paired with the downlink slot 60 ₁ to 60 _4, the radio base station 30 by the first radio device 21 ₁ up slot 41 ₁ and reception timing of transmitting a radio signal is preferentially selected so as not to overlap.

[0068] According to the radio communication system and a radio frame configuration determination method according to the present embodiment (Operation and Effect of the wireless communication system and a radio frame configuration determination method according to the embodiment), the radio frame determining unit 22 _4, the radio base station 30 and a radio frame used between the first radio device 21 ₁ (I
MT2000 / TDD scheme structure of the radio channels) of and configuration time correlation on the basis of the radio terminals 10 ₁ to 10 _n and is capable radio frames be used in between the second radio device 21 ₂ (radio channel of the PHS system) function calculating unit 22 ₃ time correlation function calculated by _{∫F 1 (t) × F 2} (t-
Depending on tau) dt, to determine the configuration of the wireless terminal 10 ₁ to 10 _n and the radio frame used in between the second radio device 21 ₂ (radio channel of the PHS system), the first radio device 21 ₁ and it is possible to reduce the influence of interference between the second radio device 21 _2.

[0069] Further, according to the radio communication system and a radio frame configuration determination method according to the present embodiment, a radio frame determining unit 22 _4, the correlation function [integral] F 1 above _(t) × F
_{2 (t-τ)} dt in response to tau to minimize by delaying the timing of the radio frame, to determine the configuration of a wireless frame used in the first radio device 21 ₁ and the second wireless device 21 ₂ it is possible to reduce the influence of mutual interference between the readily first radio device 21 ₁ and the second wireless device 21 ₂ on the basis of assignment of time slots only in the radio frame.

[0070] Further, according to the radio communication system and a radio frame configuration determination method according to the present embodiment, the second radio ₂₁₂ is a time slot for transmitting and receiving radio signals, a radio signal at a first radio device 21 ₁ to select according to the timing of transmitting and receiving, the first radio device 21 ₁ and the second radio device 21
₂ can be further reduced.

(Radio Communication System According to Modification 1) Modification 1 of the present invention will be described with reference to FIG. FIG. 9 is a schematic configuration diagram illustrating a wireless communication system according to the present modification.

The radio communication system according to the present modification has a PH
S wireless communication system (PHS wireless terminal 10b ₁ , PHS
Wireless base station 20b, PHS network) and IMT 20
00 / TDD wireless communication system (IMT2000 / TD
D wireless terminal 10a ₁ , IMT2000 / TDD wireless base station 20a, and IMT2000 / TDD network). As shown in FIG. 9, the wireless communication system according to the present modification includes a PHS wireless base station 20b (second
Wireless base station), PHS wireless terminal 10b ₁ (second wireless terminal), and IMT2000 / TDD wireless base station 20a.
(A first wireless base station) and an IMT2000 / TDD wireless terminal 10a ₁ (a first wireless terminal). IMT2000 / TDD wireless terminal 10a ₁ and P
HS wireless terminal 10b ₁ may be a plurality of presence.

The PHS radio base station 20b is connected to the radio 21b
And a control unit 22b.
by b, which is the second radio base station that performs radio communication via the radio channel of PHS system between the PHS wireless terminal 10b _1. IMT2000 / TDD radio base station 20a
Is constituted by a wireless device 21a and a control unit 22a, and the IM 21a (first wireless means)
Between T2000 / TDD radio terminal 10a ₁ IMT2
000 / TDD is a first wireless base station that performs wireless communication via a wireless channel.

In the IMT2000 / TDD radio communication system, the IMT2000 / TDD radio base station 20a and the IM
Between T2000 / TDD radio terminal 10a _1, is capable of vertically asymmetrical communication, it is possible to IMT2000 / TDD radio base station 20a is freely set up slot and downlink slot.

The control unit 22a and the control unit 22b have the same function as the control unit 22 described in the above embodiment, that is, the function F ₁ (t) determination unit (first function calculation means) and the function F ₂ (t) It has a determining unit (first function calculating unit), a time correlation function calculating unit (correlation function calculating unit), and a wireless frame determining unit (wireless frame configuration determining unit). The control unit 22a and the control unit 22b are connected to each other by a wired or wireless communication line.

FIG. 10 shows that in the radio communication system according to this modification, the PHS radio base station 20b
0 / TDD radio base station 20a and IMT2000 / TDD
To avoid the influence of interference by the wireless communication between the wireless terminal 10a _1, illustrates a method of determining the structure of a radio frame for wireless communication with the PHS wireless terminal 10b _1.

In FIG. 10, the method comprises the steps B0
At the start of the PHS radio base station 20b,
IMT2000 / TDD radio base station 20a and IMT2000 / TDD radio terminal 10a by radio base station 20b
_This is started when a change in the configuration of the wireless frame for wireless communication between the wireless communication apparatus and the wireless communication apparatus is detected.

[0078] In step B1, PHS radio base station 20b is, to obtain information relating to the configuration of a radio frame used in the wireless communication between the IMT2000 / TDD radio base station 20a and IMT2000 / TDD radio terminal 10a _1. As a method of acquiring this information, the control unit 22b of the PHS radio base station 20b uses the IMT2000 / TDD
The method of acquiring this information from the control unit 22a of the wireless base station 20a via a wired or wireless communication line, and the method in which the wireless device 21b of the PHS wireless base station 20b uses the IMT2000 / TDD
IMT2000 / from the wireless device 21a of the wireless base station 20a
Receiving a control signal that is always transmitted to the TDD radio terminal 10a _1, a method of obtaining this information from the radio frame configuration contained in the control signal is considered.

In step B2, the function F ₁ (t) determination unit of the PHS radio base station 20b uses the same method as in step A3 of the above embodiment to execute the above-described IMT2000 / TD.
Based on the radio frame structure used for wireless communication between the D radio base station 20a and IMT2000 / TDD radio terminal 10a _1, determines the function _F 1 (t).

[0080] In step B3, in the same manner as in step A4 of the embodiments described above, the function _F 2 (t) determining unit of the PHS radio base station 20b is, that can be used with the PHS wireless terminal 10b ₁ radio From the structure of the frame, the function F
₂ Determine (t).

In step B4, the time correlation function calculator of the PHS radio base station 20b calculates the time correlation function ∫F ₁ (t) × based on the function F ₁ (t) and the function F ₂ (t).
Calculate F ₂ (t−τ) dt.

In the radio communication system according to this modification, I
Radio 21a of MT2000 / TDD radio base station 20a
Is the IMT2000 / TDD downlink communication slot 50a ₁
Or via 50 ₃ IMT2000 / TDD radio terminal 1
While the 0a ₁ is transmitting a radio signal, the radio device 21b of the PHS radio base station 20b is, PHS downlink slot 60a
Via ₁ to 60a ₄ when transmitting a radio signal to the PHS radio terminal 10b _1, and, IMT2000 / TDD
The radio 21a of the radio base station 20a is
Via the TDD uplink slot 40a ₁ IMT2000 /
From TDD radio terminal 10a ₁ while receiving a radio signal, the radio device 21b of the PHS radio base station 20b is, PHS
When receiving a radio signal from the PHS radio terminal 10b ₁ through the uplink slots 70 ₁ to 70 _4, IMT200
0 / TDD influence of mutual interference between the radio 21b of the wireless terminal 10a ₁ radios 21a and the PHS radio base station 20b is the smallest.

Therefore, the time correlation function calculation section of the PHS radio base station 20b obtains the value of τ at which the value of the time correlation function becomes maximum. FIG. 7 shows that 1 ms is appropriate for this τ.

In step B5, the radio frame determining unit of the PHS radio base station 20b determines whether the PHS radio terminal 10b
The structure of a radio frame that can be used with the _1,
By delaying by the time τ, the PHS wireless terminal 1
Optimizing the configuration of a radio frame for wireless communication with a 0b _1.

FIG. 11 shows the above-mentioned IMT2000 / TDD.
Radio base station 20a and IMT2000 / TDD radio terminal 1
Shows a radio frame structure used for wireless communication between 0a ₁ and (a), configuration of a radio frame for wireless communication with the PHS wireless terminal 10b ₁ which is determined in step B5 and (b). Structure of a radio frame for wireless communication with the PHS wireless terminal 10b ₁ (b), the above IMT200
0 / TDD radio base station 20a and IMT2000 / TDD
Compared to the radio frame structure used for wireless communication between the wireless terminal 10a ₁ (a), and is obtained by delaying 1 ms.

In step B6, the wireless device 21a of the PHS wireless base station 20b transmits the determined PHS wireless terminal 1
The structure of the radio frame for wireless communication with a 0b _1, PHS
Transmitting the PHS wireless terminal 10b ₁ in the control signal via the downlink slot 60a ₁ to 60a _4.

At step B7, PHS radio terminal 1
0b ₁ constitutes a radio frame with the same configuration as the radio frame.

(Radio Communication System According to Modification 2) The configuration of the radio communication system according to Modification 2 of the present invention is the same as the configuration of the radio communication system according to Modification 1 of the present invention shown in FIG.

The radio communication system according to this modification has a PH
Using radio frame structure used in the radio communication between the S radio base station 20b and the PHS radio terminal 10b _1,
The IMT2000 / TDD radio base station 20a
It constitutes a radio frame of the radio communication between the 000 / TDD radio terminal 10a _1.

FIG. 12 shows an IMT2000 / TDD radio base station 20a in the radio communication system according to this modification.
The (second wireless base station) is not affected by interference due to wireless communication between the PHS wireless base station 20b (first wireless base station) and the PHS wireless terminal 10b ₁ (first wireless terminal). Shows a method for determining the configuration of a wireless frame for wireless communication with the IMT2000 / TDD wireless terminal 10a ₁ (second wireless terminal).

In step C1, IMT2000 /
TDD radio base station 20a may acquire the information related to the radio frame structure used for wireless communication between the PHS radio base station 20b and the PHS radio terminal 10b _1. As a method for acquiring this information, the control unit 22a of the IMT2000 / TDD radio base station 20a acquires this information from the control unit 22b of the PHS radio base station 20b via a wired or wireless communication line. / TDD radios 21a of the radio base station 20a receives the control signal transmitted continuously from the wireless device 21b of the PHS radio base station 20b to the PHS wireless terminal 10b _1, radio frame configuration contained in the control signal A method of acquiring this information from is considered.

In step C2, the function F ₂ (t) determination unit of the IMT2000 / TDD radio base station 20a determines the above PH by the same method as step A4 in the above embodiment.
Based on the radio frame structure used for wireless communication between the S radio base station 20b and the PHS radio terminal 10b _1, determines the function _F 2 (t).

In step C3, IMT2000 /
The function F ₁ (t) determining unit of the TDD wireless base station 20a determines whether the PHS wireless base station 20b and the PHS wireless terminal 10b ₁
A wireless frame configuration used for wireless communication between the
From the conditions such as the number of uplink slots and the number of downlink slots required in the MT2000 / TDD wireless communication system, IM
T2000 / TDD radio base station 20a and IMT2000
/ TDD determines all the theoretical radio frame configuration _{f k {k = 1 ... n} } that can be used between the radio terminal 10a _1. The conditions for determining the theoretical radio frame configuration f _k {k = 1... N} include those based on slot continuity, transmission power control, transmission diversity, and the like.

In step C4, the function F ₁ (t) deciding unit of the IMT2000 / TDD radio base station 20a transmits the theoretical radio frame configuration f _k上述 k = 1... A function F _1k (t) is determined based on each of n｝.

In steps C5 and C6, IMT2
000 / TDD radio base station 20a calculates the time correlation function ａF _1k (t) × F ₂ based on the combination of all functions F _1k (t) and F ₂ (t).
(T−τ) dt is calculated, and the maximum value C of this time correlation function is calculated.
_k and the value τ _k of τ at that time are _obtained .

In step C7, IMT2000 /
The time correlation function calculator of the TDD radio base station 20a calculates C _k
The combination f _max and τ _max that maximize the value are determined.

In step C8, IMT2000 /
Radio frame determining unit of the TDD radio base station 20a has a theoretical radio frame configuration _{f max,} by the time tau _max from a radio frame used in wireless communication between the PHS radio base station 20b and the PHS radio terminal 10b ₁ above delay The IMT2000 / TDD wireless terminal 10a
₁ to determine the configuration of a wireless frame for wireless communication. That is, radio 21a of IMT2000 / TDD radio base station 20a has a theoretical radio frame configuration _{f max,} from a radio frame used in the wireless communication between the PHS radio base station 20b and the PHS radio terminal 10b ₁ described above, the time τ
_max delayed by transmits the IMT2000 / TDD radio terminal 10a _1.

FIG. 13 shows the PHS radio base station 20b described above.
The radio frame structure used in the wireless communication between the PHS wireless terminal 10b ₁ and (a), IMT2000 / TDD radio terminal 10a is determined in step C8 ₁
And (b) of the configuration of a wireless frame for wireless communication with.
Here, τ _max is 0.

[0099]

According to the present invention as described in the foregoing, the radio frame determining unit 22 _4, which can be used in the configuration and the second radio 21 ₂ radio frame used in the first radio device 21 ₁ time correlation function ∫F calculated by the time correlation function calculating unit 22 ₃ based on the configuration of the radio frame
₁ (t) × F ₂ (t−τ) dt
To determine the structure of a radio frame used in 1 _2,
It is possible to reduce the influence of interference between the first radio device 21 ₁ and the second radio device 21 _2.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating an operation of determining a wireless frame configuration for wireless communication with a wireless terminal in a wireless communication system according to an embodiment of the present invention.

FIG. 3 is a diagram showing a radio frame configuration used between a radio relay device and a radio base station in a radio communication system according to an embodiment of the present invention.

FIG. 4 is a diagram showing a function f ₁ (t) in a wireless communication system according to an embodiment of the present invention.

FIG. 5 is a diagram showing a wireless frame configuration used between a wireless relay device and a wireless terminal in a wireless communication system according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a function f ₂ (t) in a wireless communication system according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a time correlation function in the wireless communication system according to the embodiment of the present invention.

FIG. 8 is a diagram showing a wireless frame configuration for wireless communication between a wireless relay device and a wireless terminal determined in the wireless communication system according to one embodiment of the present invention.

FIG. 9 is a schematic configuration diagram of a wireless communication system according to a modification of the present invention.

FIG. 10 is a flowchart illustrating an operation of determining a radio frame configuration for radio communication between a PHS radio terminal and a PHS radio base station in a radio communication system according to a modified example of the present invention.

FIG. 11 is a diagram showing a radio frame configuration for radio communication between a PHS radio terminal and a PHS radio base station determined in a radio communication system according to a modification of the present invention.

FIG. 12 shows an IMT2000 / TDD wireless terminal and an IMT20 in a wireless communication system according to a modification of the present invention.
It is a flowchart figure which shows the operation | movement which determines the radio | wireless frame structure for radio | wireless communications between 00 / TDD radio base stations.

FIG. 13 shows an IMT2000 / TDD wireless terminal determined in a wireless communication system according to a modification of the present invention and I
FIG. 3 is a diagram illustrating a wireless frame configuration for wireless communication with an MT2000 / TDD wireless base station.

FIG. 14 is a schematic configuration diagram of a wireless communication system according to the related art.

FIG. 15 is a diagram showing a wireless frame configuration used in a wireless communication system according to the related art.

FIG. 16 illustrates a wireless communication system according to the related art.
FIG. 4 is a time chart illustrating an operation of configuring a wireless frame for wireless communication.

FIG. 17 is a schematic configuration diagram of a wireless communication system according to the related art.

FIG. 18 is a diagram showing a wireless frame configuration used in a wireless communication system according to the related art.

[Explanation of symbols]

10, 10 ₁ , 10 ₂ , 10 ₃ ... wireless terminal 10a ₁ ... IMT2000 / TDD wireless terminal 10b ₁ ... PHS wireless terminal 20 ... wireless relay device 20a ... IMT2000 / TDD wireless base station 20b ... PHS wireless base station 21a, 21b ... Wireless device 21 ₁ First wireless device 21 ₂ Second wireless device 22, 22 a, 22 b Control unit 22 ₁ Function f ₁ (t) determination unit 22 ₂ Function f ₂ (t) determination unit 22 ₃ Time correlation function calculation unit 22 4 _... radio frame determining unit 30 ... wireless base station _{40 1, 40a 1, 41 1} ... IMT2000 / TDD uplink slots 50 _{1, 50 2,} 50 _3, 51 _1, 51 2, ₅₁ 3, 5
_{0a 1, 50a 2, 50a 3} ... IMT2000 / TDD
Downlink communication slots 60 ₁ , 60 ₂ , 60 ₃ , 60 ₄ , 61 ₁ , 61 ₂ , 6
_{1 3, 61 4, 60a 1} , 60a 2, 60a 3, 60a
₄ ... PHS downlink slots 70 ₁ , 70 ₂ , 70 ₃ , 70 ₄ , 71 ₁ , 71 ₂ , 7
_{1 3, 71 4, 70a 1} , 70a 2, 70a 3, 70a
₄ PHS uplink slots 80, 81, 80a IMT2000 / TDD downlink control slots

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junshin Arikawa 2-1-1-1, Nagatacho, Chiyoda-ku, Tokyo Inside NTT DoCoMo, Inc. (72) Inventor Rie Nagato Machiji Nagata, Chiyoda-ku, Tokyo No. 11-1 F-term in NTT DOCOMO, INC. (Reference) 5K028 AA01 BB04 CC02 DD04 KK11 LL02 LL11 5K067 AA03 BB04 CC04 EE02 EE06 EE10 EE72 GG03 GG11 HH21 5K072 AA04 BB13 BB13 DD27

Claims (11)

[Claims] 1. A wireless communication system for performing wireless communication using a time-division multiplex wireless frame, comprising: first wireless means for transmitting and receiving wireless signals using a time-division multiplex wireless frame; Wireless means, a first function calculating means for calculating a first function indicating a configuration of a wireless frame used in the first wireless means, and a wireless frame which can be used in the second wireless means. Second function calculating means for calculating a second function indicating a configuration; correlation function calculating means for calculating a correlation function indicating a correlation between the first function and the second function; The radio which determines the configuration of the radio frame used in the second radio means by optimizing the configuration of the radio frame which can be used in the second radio means according to the function Wireless communication system, comprising a frame structure determination unit. 2. The first function takes a predetermined value in accordance with the allocation of a time slot in a radio frame used in the first radio means, and the second function is A predetermined value is taken according to allocation of a time slot in a radio frame that can be used in the second radio means. The correlation function is a function of the first function and the second function. It shows a temporal correlation between, The optimization of the configuration of the radio frame that can be used in the second radio means, according to the value of the correlation function,
The wireless communication system according to claim 1, wherein the wireless communication system is performed by delaying a timing of the wireless frame. 3. The second wireless unit has a period in which the first wireless unit does not receive the wireless signal as a time slot for transmitting the wireless signal in the determined wireless frame. A time slot is preferentially selected. In the determined radio frame, a time slot having a period during which the first radio unit does not transmit the radio signal is prioritized as a time slot for receiving the radio signal. The wireless communication system according to claim 1, wherein the wireless communication system is selectively selected. 4. A wireless communication system comprising a wireless terminal, a wireless base station, and a wireless relay device, wherein the wireless relay device relays a wireless signal between the wireless terminal and the wireless base station, The wireless relay device includes the first wireless unit and the second wireless unit.
4. The wireless communication device according to claim 1, further comprising: a first function calculating unit, the second function calculating unit, the correlation function calculating unit, and the wireless frame configuration determining unit. The wireless communication system according to claim 1. 5. A wireless communication system comprising: a first wireless terminal, a first wireless base station, a second wireless terminal, and a second wireless base station;
A wireless communication system in which the first wireless terminal and the first wireless base station perform the wireless communication, and the second wireless terminal and the second wireless base station perform the wireless communication, The first wireless base station includes the first wireless unit and the first function calculating unit, and the second wireless base station includes the second wireless unit and the second wireless unit. The wireless communication system according to claim 1, further comprising a function calculating unit, the correlation function calculating unit, and the wireless frame configuration determining unit. 6. A wireless communication system for performing wireless communication using a time-division multiplex wireless frame, comprising: first wireless means for transmitting and receiving wireless signals using a time-division multiplex wireless frame; Wherein the second wireless means includes, as a time slot for transmitting the wireless signal in the wireless frame,
The wireless means preferentially selects a time slot having a period during which the wireless signal is not received, and the second wireless means, as the time slot for receiving the wireless signal in the wireless frame,
Wherein the radio means preferentially selects a time slot having a period during which the radio signal is not transmitted. 7. A wireless communication system including a first wireless unit and a second wireless unit for transmitting and receiving a wireless signal using a time-division multiplex wireless frame, wherein the wireless communication system includes a first wireless unit and a second wireless unit. A wireless frame configuration determining method for determining a configuration of a wireless frame, comprising: a first step of calculating a first function indicating a configuration of a wireless frame used in the first wireless unit; A second step of calculating a second function indicating a configuration of a radio frame that can be used; and a third step of calculating a correlation function indicating a correlation between the first function and the second function. And optimizing the configuration of a radio frame that can be used in the second radio means according to the correlation function, thereby providing a radio frame used in the second radio means. Radio frame configuration determination method characterized by a fourth step of determining the structure of the frame. 8. The first function takes a predetermined value according to allocation of a time slot in a radio frame used in the first radio means, and the second function is A predetermined value is taken according to allocation of a time slot in a radio frame that can be used in the second radio means. The correlation function is a function of the first function and the second function. It shows a temporal correlation between, The optimization of the configuration of the radio frame that can be used in the second radio means, according to the value of the correlation function,
The method according to claim 7, wherein the method is performed by delaying the timing of the radio frame. 9. The time slot for transmitting the wireless signal in the determined wireless frame in the second wireless device, wherein the time slot includes a period during which the first wireless unit does not receive the wireless signal. A step of preferentially selecting a time slot, wherein the second wireless means transmits the wireless signal as a time slot for receiving the wireless signal in the determined wireless frame. 9. The radio frame configuration determining method according to claim 7, further comprising a step of preferentially selecting a time slot having a period not performed. 10. The wireless communication system, comprising: a wireless terminal, a wireless base station, and a wireless relay device, wherein the wireless relay device relays a wireless signal between the wireless terminal and the wireless base station. A wireless frame configuration determining method for determining a configuration of the wireless frame used in a second wireless unit, wherein the first step, the second step, the third step, and the fourth step include: The method according to claim 7, wherein the method is performed in the wireless relay device. 11. A wireless communication system comprising a first wireless terminal, a first wireless base station, a second wireless terminal, and a second wireless base station, wherein the first wireless terminal, the first wireless base station, Performs the transmission and reception of the radio signal, and in the radio communication system in which the second radio terminal and the second radio base station transmit and receive the radio signal, the radio frame used in the second radio means A wireless frame configuration determining method for determining the configuration of the above, wherein the first step is performed in the first wireless base station, the second step, the third step, and the fourth step,
The method according to claim 7 or 8, wherein the method is performed in the second wireless base station.