JP2000341751A - Radio base station, subscriber station used therefor, and radio system composed of these - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a wireless base station to receive a wireless slot from each subscriber at a short distance to a long distance in a TDMA type WLL system. SOLUTION: In a TDMA-type WLL system, a TDMA control unit 32 configuring a radio base station 30 includes:
Based on the frame clock and the slot clock from the timing control unit 35, it recognizes which slot of the wireless slot is being received, and sets the reception timing for notifying the modulation / demodulation unit 33 of the timing for demodulation for each wireless slot. And a reception timing generation unit 323 that changes the reception timing of each radio slot at the radio base station with the reception timing generation unit 323 that changes the reception enable signal in accordance with the distance to the radio base station. Radio slots from each subscriber at a distance are received without any trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station adapted to cover a fixed subscriber from a short distance to a long distance in a wireless local loop to which a TDMA type radio communication system is applied, and a subscriber used therefor. The present invention relates to a station and a wireless system including the same.

[0002]

2. Description of the Related Art In recent years, in developing countries where communication infrastructure facilities have not been prepared, a wireless local loop (hereinafter, referred to as WLL) using radio for a fixed subscriber section has been used instead of a conventional fixed line telephone system. (Abbreviated) is in progress. Various systems are being constructed for this WLL, such as those applying Japanese PHS technology and those applying DECT technology standardized in Europe.

[0003] Further, WLL is sometimes installed in an area where a wired infrastructure is not provided, and is expected to be used in a suburb (rural area) rather than an urban area. For this reason, the wireless area (cell) covered by the base station is increasing. Accordingly, each manufacturer has taken measures such as increasing the transmission output of the radio base station and making the antenna of the subscriber directional (NT).
T Technical Journal. 8, 6, pp. 18-20 "199
6 ", FUJITSU. 48, 6, "11,199
7 ").

FIG. 12 is a block diagram of a data reception timing adjusting device for generating reception timing when performing time division communication by radio between a base station and a mobile station in a conventional radio communication system. (JP-A-6-28
No. 4065).

In FIG. 12, a data reception timing adjustment device includes an antenna 71 for receiving a radio wave, extraction of reception data 714 from a reception radio wave, and reception clock 715.
And a unique word (UW) detection for detecting a unique word for establishing bit synchronization from received data 714 based on a received clock 715 and outputting idle data 716 as meaningful information A CPU 74 for monitoring a reception state of the reception data storage unit 75 and outputting numerical data for determining a period for detecting a unique word; and a CPU unit. 76
UW detection enable signal 7 that determines the start and end times of the period for detecting a unique word based on the numerical data output from
17 is output to the UW detection unit 74 and the demodulation unit 72
And a reception timing generation unit 73 that outputs a reception enable signal 718 for controlling the start and stop of the demodulation operation to the demodulation unit 72.

[0006]

However, as described above, simply increasing the transmission output of the radio base station and improving the directivity of the subscriber antenna to increase the size of the cell increases the size of the cell (radio base station). It is not possible to cope with the delay in the reception timing of the radio slot from the subscriber of the radio base station due to the increase in the physical distance between the station and the subscriber). Hereinafter, WL using the TDMA method of PHS
An example of the L system will be described with reference to FIGS.

FIG. 10 is a configuration diagram of a WLL system using the TDMA system. In FIG. 10, a radio base station 10 is a base station that supports both subscribers (WLL subscriber stations) 11 and 12, and the radio base station 10 is connected to a network facility 14 via a line 13. I have. Another radio base station 16 is connected to the network equipment 14 via a line 15, and this radio base station 16 supports a subscriber 17. In this case, since the distance A between the radio base station 10 and the subscriber 11 is different from the distance B between the subscriber 12, the reception timing of the radio slot from the subscriber at the radio base station 10 is as shown in FIG. As shown, for the subscriber 11 at a short distance, 2.5 mS + α, and the subscriber 12 at a long distance
Is 2.5 mS + β.

Generally, the allowable value of the delay due to the distance is:
Taking PHS as an example, the RCR that defines the PHS standards
In -STD28, it is specified that it is within one symbol (5.2 μS). This translates into a distance of 300,00
0 km (Km: propagation speed of radio wave) × 5.2 μS = 1.5
6 km, and the maximum service area (cell) that the radio base station 10 can cover is 1.56 km. Therefore, when a large cell such as WLL is formed, a delay in the reception timing of a radio slot from a subscriber interferes with reception of a radio slot of the next channel, transmission of a radio slot of the base station itself, and the like. There are problems and these need to be resolved.

Also, in a radio base station using the data reception timing adjusting device shown in FIG. 12, when the size of the cell is increased, the distance between the base station and the subscriber becomes longer, so that the reception timing of the radio slot is delayed. The problem that a wireless slot cannot be received can be solved. However, in actual operation, it is impossible to individually correct the reception timing for a plurality of subscribers.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. In a wireless local loop to which a TDMA wireless communication system is applied, the reception timing or the transmission timing of a base station is individually set for each subscriber. It is an object of the present invention to provide a radio base station capable of receiving radio slots from a subscriber at a short distance to a long distance by correction, a subscriber station used for the radio base station, and a radio system composed of these. .

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a radio base station, a subscriber station used for the radio base station, and a radio system comprising the radio base station, wherein the radio base station comprises a radio section and a modem section. A TDMA control unit, a line interface unit, a timing control unit, and control means for controlling the whole. The TDMA control unit includes a frame clock generated by the timing control unit based on a frame synchronization signal from the line interface unit. Recognizing which slot of the radio slot is being received from the slot clock and changing the reception timing for notifying the modem for the demodulation timing for each radio slot in accordance with the distance from the subscriber. Timing generation unit for generating a reception enable signal by using a radio slot reception timing Start test mode for adjusting the reception timing for the subscriber at a distance hinder the subscriber ID from the subscriber by the test mode
Receiving the continuous burst signal transmitted during the continuous burst signal, determining the reception timing at which the subscriber ID can be acquired by shifting the reception timing at regular intervals during the reception of the continuous burst signal, and determining the determined reception timing for the subscriber. Reception test mode control means that determines the reception timing, and recognizes which slot of the radio slot is being transmitted from the frame clock and slot clock generated by the timing control unit, and modulates the modulation / demodulation unit for each radio slot. A transmission timing generation unit for generating a transmission enable signal by changing a transmission timing for notifying a timing for the transmission according to the distance to the subscriber, and for a subscriber at a distance that interferes with the reception timing of the radio slot. Activate the test mode to adjust the transmission timing, and A continuous burst signal transmitted together with the subscriber ID from the subscriber is received in the default mode, and a transmission timing at which the subscriber ID can be acquired is obtained by shifting the transmission timing at regular intervals during the reception of the continuous burst signal. The transmission test mode control means for determining the obtained transmission timing as the reception timing for the subscriber is provided.

According to the present invention, a wireless slot from a subscriber at a short distance to a long distance can be received without any trouble by individually correcting the reception timing or the transmission timing of the base station for each subscriber.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a radio base station which enables access to a fixed subscriber by a wireless local loop of a TDMA system, comprising a radio section, a modem section, and a TDMA section. A control unit, a line interface unit, a timing control unit, and control means for controlling the whole; and the TDMA control unit includes a frame clock and a slot generated by the timing control unit based on a frame synchronization signal from the line interface unit. Recognizing which slot of the radio slot is being received from the clock, and changing the reception timing for notifying the modem for the demodulation timing for each radio slot in accordance with the distance to the subscriber and receiving A reception timing generation unit for generating an enable signal,
This has an effect that a wireless slot from a subscriber at a short distance to a long distance can be received without any trouble.

According to a second aspect of the present invention, a test mode for adjusting a reception timing for a subscriber located at a distance that interferes with a reception timing of a radio slot is started, and the test mode is used to execute the test mode. A continuous burst signal transmitted from the subscriber together with the subscriber ID is received. During the reception of the continuous burst signal, the reception timing is shifted by a predetermined time to determine a reception timing at which the subscriber ID can be acquired. The radio communication system further comprises a reception test mode control means for determining a timing as a reception timing for the subscriber, and has an effect that the change reception timing of the radio base station can be checked.

The invention according to claim 3 of the present invention comprises storage means for storing reception timing data for each subscriber determined by the reception test mode control means, and the reception timing data of the storage means is controlled by the control means. It is configured to be managed, and has the effect of being able to receive wireless slots from distant subscribers even in the operating state.

According to a fourth aspect of the present invention, the reception timing generation section includes a reception slot detection position change register for independently changing a reception timing for each radio slot of each subscriber, and The reception timing data for each subscriber determined by the reception test mode control means is set in the slot detection position change register by the control means, and the reception timing data of each radio slot of the radio base station is set based on the setting data of each register. This has the effect that the reception timing can be changed independently.

[0017] The invention according to claim 5 of the present invention provides a TDM
The A control unit recognizes which slot of the radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and notifies the modulation / demodulation unit of the timing for modulation for each radio slot. A transmission timing generation unit that changes the transmission timing in accordance with the distance from the subscriber and generates a transmission enable signal, and changes the transmission timing at the radio base station so that the radio slots of subscribers with different distances can be used. It has the effect of being able to receive.

According to the invention described in claim 6 of the present invention, a test mode for adjusting transmission timing to a subscriber located at a distance that interferes with the reception timing of the radio slot is started, and the test mode is used by the test mode. A continuous burst signal transmitted from the subscriber together with the subscriber ID is received, and during the reception of the continuous burst signal, the transmission timing is shifted at regular intervals to determine a transmission timing at which the subscriber ID can be acquired. The transmission test mode control means for determining the timing as the reception timing for the subscriber is provided, and has an effect that the changed transmission timing of the radio base station can be checked.

The invention according to claim 7 of the present invention comprises storage means for storing transmission timing data for each subscriber determined by the transmission test mode control means, and the transmission timing data of the storage means is controlled by the control means. It is configured to be managed, and has the effect of being able to receive wireless slots from distant subscribers even in the operating state.

According to an eighth aspect of the present invention, the transmission timing generating section includes a transmission slot position change register for independently changing the transmission timing for each radio slot of each subscriber, In the position change register, the transmission timing data for each subscriber determined by the transmission test mode control means is set by the control means, and the transmission timing of each radio slot of the radio base station is set based on the setting data of each register. Can be changed independently.

According to a ninth aspect of the present invention, each data of the reception timing and the transmission timing managed by the control means is operable from network side equipment connected via a line interface unit. , Reception timing and transmission timing can be added or deleted from the network-side equipment.

According to a tenth aspect of the present invention, there is provided a subscriber station for use in a radio base station which enables access to a fixed subscriber by a wireless local loop of a TDMA system, wherein the radio base station comprises: A radio section, a modem section, a TDMA control section, a line interface section, a timing control section, and control means for controlling the whole.
The control unit recognizes which slot of the radio slot is being received from the frame clock and the slot clock generated by the timing control unit based on the frame synchronization signal from the line interface unit. And a reception timing generation unit that generates a reception enable signal by changing a reception timing for notifying the modulation / demodulation unit of a timing for demodulation in accordance with a distance from the subscriber, and is provided at a distance from a short distance to a long distance. This has an effect that the wireless slot from the subscriber station can be received without any trouble.

The invention according to claim 11 of the present invention activates a test mode for adjusting the reception timing for a subscriber located at a distance that interferes with the reception timing of the radio slot, and the test mode activates the test mode. Receiving a continuous burst signal transmitted from the subscriber together with the subscriber ID,
The reception test mode control means for determining the reception timing at which the subscriber ID can be acquired by shifting the reception timing at regular intervals during reception of the continuous burst signal and determining the determined reception timing as the reception timing for the subscriber. It has the effect that the change reception timing of the radio base station can be checked for each subscriber station.

According to a twelfth aspect of the present invention, there is provided storage means for storing reception timing data for each subscriber determined by the reception test mode control means, and the reception timing data of the storage means is controlled by the control means. It is managed and has the effect of being able to receive radio slots from distant subscriber stations even in the operating state.

According to a thirteenth aspect of the present invention, the reception timing generating section includes a reception slot detection position change register for independently changing a reception timing for each radio slot of each subscriber, and The reception timing data for each subscriber determined by the reception test mode control means is set in the slot detection position change register by the control means. The radio base station is provided for each subscriber station based on the setting data in each register. This has the effect that the reception timing of each slot of the station can be changed independently.

According to a fourteenth aspect of the present invention, the TD
The MA control unit recognizes which slot of the radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and notifies the modulation / demodulation unit of the timing for modulation for each radio slot. A transmission timing generation unit for generating a transmission enable signal by changing a transmission timing in accordance with a distance from a subscriber, and changing a transmission timing in a radio base station to thereby change a radio slot of a subscriber station having a different distance. Can be received.

According to a fifteenth aspect of the present invention, a test mode for adjusting transmission timing for a subscriber located at a distance that interferes with the reception timing of a radio slot is started, and the test mode is used to execute the test mode. Receiving a continuous burst signal transmitted from the subscriber together with the subscriber ID,
Transmission test mode control means for determining the transmission timing at which the subscriber ID can be acquired by shifting the transmission timing at regular intervals during reception of the continuous burst signal and determining the determined transmission timing as the reception timing for the subscriber. This has the effect that the change transmission timing of the radio base station can be checked for each subscriber station.

The invention according to claim 16 of the present invention comprises storage means for storing transmission timing data for each subscriber determined by the transmission test mode control means, and the transmission timing data of the storage means is controlled by the control means. It is managed and has the effect of being able to receive radio slots from distant subscriber stations even in the operating state.

According to a seventeenth aspect of the present invention, the transmission timing generating section includes a transmission slot position change register for independently changing transmission timing for each radio slot of each subscriber, In the position change register, the transmission timing data for each subscriber determined by the transmission test mode control means is set by the control means. Based on the setting data of each register, the radio base station of each subscriber station is set. This has the effect that the transmission timing of each radio slot can be changed independently.

The invention according to claim 18 of the present invention is configured such that each data of the reception timing and the transmission timing managed by the control means can be operated from the network equipment connected via the line interface unit. , Reception timing and transmission timing can be added or deleted from the network-side equipment.

The invention according to claim 19 of the present invention is a radio system comprising a radio base station enabling access to a fixed subscriber by a TDMA wireless local loop and a subscriber station used for the radio base station. The radio base station includes a radio unit, a modulation / demodulation unit, a TDMA control unit, a line interface unit, a timing control unit, and control means for controlling the whole; and the TDMA control unit transmits a frame synchronization signal from the line interface unit. Based on the frame clock and the slot clock generated by the timing control unit, it recognizes which slot of the radio slot is being received and notifies the modem unit of the timing for demodulation for each radio slot. A reception which changes a timing according to a distance from the subscriber to generate a reception enable signal It is those comprising a timing generator, an effect that may be in the WLL-type radio system, to receive without hindrance the radio slot from a subscriber station in a short distance to a long distance.

According to the invention described in claim 20 of the present invention, a test mode for adjusting reception timing is activated for a subscriber located at a distance that interferes with the reception timing of the radio slot, and the test mode is used to execute the test mode. Receiving a continuous burst signal transmitted from the subscriber together with the subscriber ID,
The reception test mode control means for determining the reception timing at which the subscriber ID can be acquired by shifting the reception timing at regular intervals during reception of the continuous burst signal and determining the determined reception timing as the reception timing for the subscriber. In the WLL-type wireless system, it has an effect that the change reception timing of the wireless base station can be checked for each subscriber station.

According to a twenty-first aspect of the present invention, there is provided storage means for storing reception timing data for each subscriber determined by the reception test mode control means, and the reception timing data of the storage means is controlled by the control means. The WLL-type wireless system has an effect of being able to receive a wireless slot from a long-distance subscriber station even in an operating state.

According to a twenty-second aspect of the present invention, the reception timing generation unit includes a reception slot detection position change register for independently changing a reception timing for each radio slot of each subscriber, and The reception timing data for each subscriber determined by the reception test mode control means is set in the slot detection position change register by the control means. The radio base station is provided for each subscriber station based on the setting data in each register. This has the effect that the reception timing of each slot of the station can be changed independently.

According to a twenty-third aspect of the present invention, the TD
The MA control unit recognizes which slot of the radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and notifies the modulation / demodulation unit of the timing for modulation for each radio slot. The transmission timing generator includes a transmission timing generator that changes a transmission timing according to a distance from a subscriber to generate a transmission enable signal. In a WLL-type wireless system, the transmission timing at a radio base station is changed to change the distance. This has the effect that the wireless slot of the subscriber station can be received.

The invention according to claim 24 of the present invention activates a test mode for adjusting the transmission timing to a subscriber located at a distance that interferes with the reception timing of the radio slot, and the test mode activates the test mode. Receiving a continuous burst signal transmitted from the subscriber together with the subscriber ID,
Transmission test mode control means for determining the transmission timing at which the subscriber ID can be acquired by shifting the transmission timing at regular intervals during reception of the continuous burst signal and determining the determined transmission timing as the reception timing for the subscriber. In the WLL-type wireless system, it has an effect that the change transmission timing of the wireless base station can be checked for each subscriber station.

According to a twenty-fifth aspect of the present invention, there is provided storage means for storing transmission timing data for each subscriber determined by the transmission test mode control means, and the transmission timing data of the storage means is controlled by the control means. The WLL-type wireless system has an effect of being able to receive a wireless slot from a long-distance subscriber station even in an operating state.

According to a twenty-sixth aspect of the present invention, the transmission timing generating section includes a transmission slot position change register for independently changing transmission timing for each radio slot of each subscriber, In the position change register, the transmission timing data for each subscriber determined by the transmission test mode control means is set by the control means. Based on the setting data of each register, the radio base station of each subscriber station is set. This has the effect that the transmission timing of each radio slot can be changed independently.

According to a twenty-seventh aspect of the present invention, the data of the reception timing and the transmission timing managed by the control means are operable from network-side equipment connected via a line interface unit. , WLL type wireless system, it is possible to add or delete each data of the reception timing and the transmission timing from the network side equipment.

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.

First, prior to the description of Embodiment 1 of the present invention, a case will be described in which a wireless base station supports subscribers of different distances in a WLL system. In this case, as shown in FIG. 10, if the distance between the subscribers 11, 12 supported by the radio base station 10 and the radio base station 10 is different, the timing of the slot received by the radio base station 10 is apparent from FIG. As shown in FIG. The delay of the reception timing is 2.5 mS + α in the case of the subscriber 11 having a short distance, and 2.5 mS + β in the case of the subscriber 12 having a long distance, and the reception timing is delayed as the distance from the radio base station 10 increases.
The relationship β> α holds.

In general, the timing of a radio slot that can be received by the radio base station 10 is represented by RCR
In STD28, the number is within one symbol. When a radio base station is manufactured according to this standard, the service area (cell) that can be covered is 1.56 km, which is 1.56 km.
Km is the limit for transmitting and receiving wireless slots without delay. In this case, in order to receive the wireless slot over a longer distance, it is necessary to change the reception timing. However, what is important here is that the reception timing must be individually corrected to correspond to a specific subscriber. This means that each reception slot must be able to independently change the reception timing.

Therefore, the present invention relates to a radio base station in which the reception timing of the radio base station is individually corrected for each subscriber so that a radio slot from a short-distance to long-distance subscriber can be received without any trouble. 1 to 3 will be described.

FIG. 1 is a block diagram showing a basic configuration of a radio base station in a WLL system using the TDMA control method according to the present invention, and FIG. 2 is a TDMA control unit and modulation / demodulation of the radio base station according to the first embodiment of the present invention. FIG. 3 is a block diagram showing the internal configuration of the receiving timing generator according to Embodiment 1 of the present invention.

In FIG. 1, WLL of the TDMA control system is used.
A radio base station 30 (corresponding to the radio base station 10 in FIG. 10) used in the system includes a line interface unit 31 for connecting the radio base station 30 to a network-side facility via a line.
Is connected to the line interface unit 31 to perform coding for error detection, simple confidentiality processing, scramble processing, etc. on the transmission radio channel, and perform error detection, UW (unique word) detection, TDM with descrambling process / channel type determination function
A control unit 32, a modem unit 33 connected to the TDMA control unit 32, and having a function of modulating baseband data and demodulating a received signal to return to baseband data; and a modem unit 33 connected to the modem unit 33 to transmit and receive radio channels. And a timing signal based on a frame synchronization signal from the line interface unit 31 for performing TDMA.
A timing control unit 35 for supplying the control unit 32 and the modem unit 33, and a CPU unit 36 for controlling the entire radio base station 30
It has. Reference numeral 37 denotes a transmitting / receiving antenna connected to the wireless unit 34.

Next, the configuration of the radio base station shown in FIG. 2 will be described. In FIG. 2, the radio base station 30 includes a TDMA control unit 32 and a modem unit 3 as in the case shown in FIG.
3, radio section 34, timing control section 35, CPU section 36
And a transmitting / receiving antenna 37 and the like.

The modulation / demodulation unit 33 includes a demodulation unit 331 and a modulation unit 332.

The demodulation unit 331 converts the reception signal from the radio unit 34 into baseband data (reception data) according to the radio frame clock 351 and radio slot clock 352 from the timing control unit 35 and the reception enable signal 3232 from the TDMA control unit 32. The signal is demodulated to 3311 and the received clock 3312 is reproduced.

The modulation section 332 converts the transmission data from the TDMA control section 32 into a baseband signal based on the transmission clock 353, the radio frame clock 351 and the radio slot clock 352 from the timing control section 35, and the transmission enable signal 3241 from the TDMA control section 32. The data is modulated and output to the radio unit 34.

The TDMA control unit 32 includes the UW detection unit 3
21, a reception data storage unit 322, a reception timing generation unit 323, a transmission timing generation unit 324, and a transmission data storage unit 325.

The UW detector 321 receives the reception clock 331
, The unique word (UW) data is detected from the received data 3311 on the basis of
Outputs 1. Further, the reception data storage unit 322 stores the reception data / audio 321 based on the reception clock 3312.
1 is stored.

The reception timing generation section 323 transmits a unique word to the UW detection section 321 based on the reception data storage section 322, the instruction from the CPU section 36 and the radio frame clock 351 and the radio slot clock 352 from the timing control section 35. A UW detection enable signal 3231 for notifying the detection timing and a reception enable signal 3232 for notifying the demodulation timing to the demodulation unit 331 are generated and output.

The transmission timing generation section 324 generates a transmission enable signal 3241 for notifying the modulation section 332 of the timing of the modulation by the instruction from the CPU section 36 and the radio frame clock 351 and the radio slot clock 352 from the timing control section 35. I do. The transmission data storage unit 325 stores the transmission data / voice 38 transmitted via the line interface unit 31 (see FIG. 1) according to the instruction from the CPU unit 36 and the transmission clock 353 from the timing control unit 35.

FIG. 4 is an explanatory diagram showing the relationship between the transmission / reception slot of the radio base station and the frame timing and slot timing transmitted from the timing control unit 35 according to Embodiment 1 of the present invention. In FIG.
(A) shows the transmission and reception slots of the radio base station according to the four-channel TDMA-TDD system, and the first to fourth transmission slots for four channels and the first to fourth reception slots for four channels in one frame. Slot is set. (B) shows the frame timing generated by the timing control unit 35, and (C) shows the slot timing generated by the timing control unit 35.

Therefore, it is possible to determine the number of the transmission / reception radio slot based on the number of the slot timing from the frame timing. In addition, the TDMA control unit 32 that has received the frame timing and the slot timing makes it possible to change the reception timing independently for each slot.

Next, the configuration of the reception timing generation section 323 which can change the reception timing independently for each slot will be described with reference to FIG.

In FIG. 3, the reception timing generation section 323 recognizes the slot number being received at the time of reception based on the radio frame clock 351 and the radio slot clock 352 from the timing control section 35, and outputs a UW detection enable signal. 3231 and reception enable signal 32
32, a timing generator 323A for outputting a UW detection trigger signal 323A1 and a reception enable trigger signal 323A2 based on the radio frame clock 351 and the radio slot clock 352, and a UW detection trigger signal from the timing generator 323A. UW detection enable signal generation section 323B that generates and outputs UW detection enable signal 3231 by 323A1, and reception enable trigger signal 32 from timing generation section 323A.
3A2, a reception enable signal generation unit 323C for generating and outputting a reception enable signal 3232, and further for independently changing the reception timing of each of the first to fourth reception slots of the radio base station shown in FIG. First to fourth reception slot detection position change register 323D
To 323G.

The CPU 36 sets the reception timing change data in the first to fourth reception slot detection position change registers 323D to 323G. Further, the reception timing change data of these registers 323D to 323G is supplied to the timing generation unit 323A. The change of the reception timing is performed by the bit clock (transmission clock) 353 input to the reception timing generation unit 323.

Next, the operation when the reception timing of the radio base station 30 is changed for each reception slot from the subscriber will be described with reference to FIG. FIG. 5 is a diagram showing reception timing generator 3 of the radio base station according to Embodiment 1 of the present invention.
FIG. 3 is a diagram for explaining the timing of a signal output from a signal 23.

The default state of the radio base station (RCR-S
In TD28, the phase fluctuation of the receivable slot is ±
In the case where the timing is generated on the assumption that the symbol is one symbol), the UW detection enable signal 3231 output from the reception timing generation unit 323 is used as shown in FIG.
And a reception enable signal 3232 are output for each of the first to fourth reception slots. The UW detection enable signal 3231 is generated and output each time the UW detection trigger signal 323A1 output from the timing generation unit 323A is input to the UW detection enable signal generation unit 323B. The reception enable signal 3232 is generated and output each time the reception enable trigger signal 323A2 is input to the reception enable signal generation unit 323C.

In the default state, the phase between the UW detection trigger signal 323A1 and the reception enable trigger signal 323A2 of each reception slot and each slot timing is, as shown in FIG. 5, γ1 = γ2 = γ3 = γ4, δ1
= Δ2 = δ3 = δ4.

When changing the reception timing of the first to fourth reception slots, the first to fourth reception slot detection position change registers 3 set by the CPU 36 are set.
23D to 323G5, the UW detection trigger signal 323A1 transmitted from the timing generator 323A
And the timing of the reception enable trigger signal 323A2.

For example, when changing the reception timing of the first reception slot, the UW detection trigger signal 323A1 is set by the first reception slot detection position change register 323D.
And the phases γ1 and δ1 from the slot timing of the reception enable trigger signal 323A2 are changed. When the UW detection trigger signal 323A1 sent from the timing generation unit 323A according to the changed phase γ1 is input to the UW detection enable signal generation unit 323B, the UW detection enable signal generation unit 323B outputs the changed phase. The UW detection enable signal 3231 corresponding to γ1 is output to the UW detection unit 321. Thereby, the UW detection unit 32
The detection timing of one unique word can be changed.

The reception enable trigger signal 323A2 sent from the timing generation section 323A according to the changed phase δ1 is used as the reception enable signal generation section 323C.
, The reception enable signal generation unit 323
From C, a reception enable signal 3232 corresponding to the changed phase δ1 is output to the demodulation unit 331. This allows
The reception timing for the first reception slot of the demodulation unit 331 can be changed.

Next, the operation for determining the reception timing of the radio base station for each subscriber will be described with reference to FIG. FIG. 6 is a sequence diagram showing an operation procedure for adjusting the reception timing of the radio base station for each subscriber,
Here, it is to check how much the reception timing of the radio base station should be adjusted for each subscriber in order to correct the reception timing of the reception slot of the radio base station.

In FIG. 6, first, the test mode for adjusting the reception timing is notified from the radio base station 30 to the subscriber (step 61). The test mode notification includes a radio base station ID (CS-ID) for identifying the radio base station 30 that has designated the test mode, a subscriber ID (PS-ID) for designating the subscriber, Information for specifying a transmission frequency, a transmission slot, a transmission burst time, and the like are included. The subscriber receiving this information performs continuous burst transmission to the radio base station 30 (step 62). At this time, the wireless base station ID and the subscriber ID information are also transmitted together. As a result, the wireless base station and the subscriber who are performing the test can be specified.

After performing the test mode notification, the radio base station 30 enters the receiving state, receives the continuous burst signal from the subscriber, and adjusts the reception timing of the continuous burst signal in accordance with the instruction from the CPU unit 36 for a predetermined time. Shift every time. Accordingly, at the reception timing at which the subscriber ID of the subscriber who has designated the test mode can be obtained, the radio base station 30 receives OK (step 63). Then, when the reception is OK, the subscriber is notified of the reception OK (step 64). Thereafter, the subscriber notifies the wireless base station 30 that the reception OK has been received (step 6).
5).

When the radio base station 30 receives the reception OK from the subscriber, the radio base station 3 ends the test mode and notifies the subscriber of the end of the test mode (step 66). Also ends. Also,
If reception from the subscriber is not possible within the designated transmission burst time, the sequence operation shown in FIG. 6 is repeated.

The correction information of the reception timing for each subscriber obtained by the test mode processing described above is stored and managed in a storage device (not shown) built in the CPU unit 36. When communication is performed between the radio base station 30 and each subscriber, the correction information of the reception timing stored in the storage device of the CPU unit 36 is stored in the reception timing generation unit for each reception slot allocated to each subscriber. 32
3rd first to fourth reception slot detection position change register 32
3D to 323G, and the receiving timing of each receiving slot of the wireless base station 30 can be changed based on the correction information.

The addition or deletion of the reception timing data stored in the storage device in the CPU section 36 can be performed at any time from the network-side equipment connected via the line interface section 31.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG. 2 and FIGS.

FIG. 7 is a block diagram showing an internal configuration of transmission timing generating section 324 according to Embodiment 2 of the present invention.
FIG. 8 is a diagram for explaining the timing of a signal output from the transmission timing generator 324 of the radio base station, and FIG. 9 is a sequence diagram showing an operation procedure when adjusting the transmission timing of the radio base station for each subscriber. It is.

In the second embodiment, by changing the transmission timing of the radio base station, reception slots from each subscriber can be received without any trouble. This is T
In the DMA-TDD system, half of one frame from the time when a subscriber receives a radio slot from a radio base station.
By transmitting the wireless slot of the own station to the wireless base station after 2.5 ms corresponding to the above, the transmission timing at the wireless base station can be dealt with earlier than usual.

First, the transmission timing generator 3 shown in FIG.
24 will be described.

The transmission timing generation section 324 is based on the radio frame clock 351 and the radio slot clock 352 from the timing control section 35, and recognizes the transmission enable signal 3 for recognizing which slot is being transmitted at the time of transmission.
241 and outputs the radio frame clock 351
Transmission enable signal 324A by the wireless slot clock 352 and the bit clock (transmission clock) 353.
A transmission enable trigger generator 324A that outputs 1
A transmission enable signal generation unit 324B that generates and outputs a transmission enable signal 3241 based on the transmission enable trigger signal 324A1 from the transmission enable trigger generation unit 324A, and further includes the first to fourth radio base stations shown in FIG. There are first to fourth transmission slot position change registers 324C to 324F for independently changing the transmission timing of each transmission slot.

The setting of the transmission timing change data in the first to fourth transmission slot position change registers 324C to 324F is performed by the CPU unit 36. Also,
The transmission timing change data of these registers 324C to 324F is supplied to the transmission enable trigger generator 324A.

FIG. 8 shows a case where the transmission timing of the transmission slot of the radio base station 30 is changed for each subscriber.
This will be described with reference to FIG.

In the default state, the phase between the transmission enable trigger signal 324A1 of each transmission slot and each slot timing has a relationship of ε1 = ε2 = ε3 = ε4.

Here, for example, when the setting for changing the transmission timing is made in the first transmission slot position change register 324C from the CPU section 36, the generation timing with respect to the slot timing of the transmission enable trigger signal 324A1 of the first transmission slot is set. And the phase relationship becomes ε1 <ε2 = ε3 = ε4 as shown in FIG. Thereby, the transmission timing of the radio slot (transmission slot) from the radio base station to the subscriber can be advanced, and the reception from the distant subscriber can be performed without any trouble without changing the reception timing of the radio base station. it can.

Next, a processing procedure for determining how much the transmission timing of the radio base station should be shifted in order to enable transmission and reception of radio slots between a subscriber at a long distance and the radio base station will be described. This will be described with reference to FIG.

In FIG. 9, first, the radio base station 30 notifies the subscriber of a test mode for adjusting transmission timing (step 91). The test mode notification includes a radio base station ID (CS-ID) for identifying the radio base station 30 that has designated the test mode, a subscriber ID (PS-ID) for designating the subscriber, Information for specifying a transmission frequency, a transmission slot, a transmission burst time, and the like are included. The subscriber receiving this information performs continuous burst transmission to the radio base station 30 (step 92). At this time, the wireless base station ID and the subscriber ID information are also transmitted together. As a result, the wireless base station and the subscriber who are performing the test can be specified.

After the notification of the test mode, the radio base station 30 enters the reception state, receives the continuous burst signal from the subscriber, and keeps the transmission timing of the radio base station 30 constant according to the instruction from the CPU unit 36. Stagger every hour. Then, at the reception timing when the subscriber ID of the subscriber who has designated the test mode can be obtained, the wireless base station 30
Is received OK (step 93). And the reception OK
At this point, the subscriber is notified of the reception OK (step 94). Thereafter, the subscriber notifies the radio base station 30 that the reception OK has been received (step 95).

When the radio base station 30 receives the reception OK from the subscriber, the radio base station 3 ends the test mode and notifies the subscriber of the end of the test mode (step 96). Also ends. Also,
If reception from the subscriber is not possible within the designated transmission burst time, the sequence operation shown in FIG. 9 is repeated.

The transmission timing correction information for each subscriber obtained by the test mode processing as described above is stored and managed in a storage device (not shown) incorporated in the CPU unit 36. When communication is performed between the wireless base station 30 and each subscriber, the transmission timing correction information stored in the storage device of the CPU unit 36 is stored in the transmission timing generation unit for each transmission slot assigned to each subscriber. 32
4 first to fourth transmission slot position change register 324C
To 324F, and the transmission timing of each transmission slot of the radio base station 30 can be changed based on the correction information.

The transmission timing data stored in the storage device in the CPU unit 36 can be added or deleted from network-side equipment connected via the line interface unit 31 at any time.

[0086]

As described above, according to the present invention, TDMA
In a wireless local loop applying a wireless communication system of the system, by individually correcting the reception timing or the transmission timing of the radio base station for each subscriber,
There is an effect that a wireless slot from a subscriber at a short distance to a long distance can be received without any trouble.

[Brief description of the drawings]

FIG. 1 shows a WL using a TDMA control method according to the present invention.
FIG. 2 is a block diagram showing a basic configuration of a wireless base station in the L system

FIG. 2 shows T of a radio base station according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing an internal configuration of a DMA control unit and a modem unit.

FIG. 3 is a block diagram showing an internal configuration of a reception timing generation unit according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a transmission / reception slot of a radio base station and a frame timing and a slot timing transmitted from a timing control unit 35 according to Embodiment 1 of the present invention.

FIG. 5 is a diagram for explaining a timing of a signal output from a reception timing generation unit of the radio base station according to the first embodiment of the present invention.

FIG. 6 is a sequence diagram showing an operation procedure when adjusting the reception timing of the radio base station for each subscriber according to Embodiment 1 of the present invention.

FIG. 7 is a block diagram showing an internal configuration of a transmission timing generation section 324 according to Embodiment 2 of the present invention.

FIG. 8 is a diagram for explaining the timing of a signal output from a transmission timing generation unit according to the second embodiment of the present invention.

FIG. 9 is a sequence diagram showing an operation procedure when adjusting the transmission timing of the radio base station for each subscriber in Embodiment 2 of the present invention.

FIG. 10 is a configuration diagram of a WLL system using a TDMA method.

FIG. 11 is a diagram for explaining a possibility of a radio slot timing received by a radio base station depending on a distance between the radio base station and a subscriber in a WLL system.

FIG. 12 is a block diagram of a data reception timing adjustment device of a conventional wireless communication system.

[Explanation of symbols]

11, 12 subscriber (WLL subscriber station) 30 radio base station 31 line interface unit 32 TDMA control unit 33 modem unit 34 radio unit 35 timing control unit 36 CPU unit 37 transmitting / receiving antenna 321 UW detection unit 322 reception data storage unit 323 reception timing generation section 324 transmission timing generation section 325 transmission data storage section 331 demodulation section 332 modulation section 323A timing generation section 323B UW detection enable signal generation section 323C reception enable signal generation section 323D to 323G first to fourth reception slot detection Position change register 324A Transmission enable trigger generator 324B Transmission enable signal generator 324C to 324F First to fourth transmission slot position change registers

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 7/08 H04M 3/00 C 5K072 12/00 H04B 7/15 C H04M 3/00 H04L 11/00 F Term (Reference) 5K028 AA15 BB06 CC02 CC05 DD01 DD02 HH02 HH03 MM08 MM12 MM16 NN01 NN31 NN45 SS24 SS28 5K030 GA11 HB15 HB16 JL01 JL08 JT01 KA13 KA21 LA15 5K047 AA01 AA11 BB01 BB01 MM01 BB01 BB01 MM01 HH17 HH26 JJ09 JJ11 5K067 AA22 CC04 EE02 EE10 EE22 EE32 EE72 GG03 5K072 AA29 BB01 BB13 BB27 CC03 CC15 DD16 EE23 EE24 FF14 FF25 GG01 GG11

Claims (27)

[Claims] 1. Access to a fixed subscriber by TDM
A wireless base station that is enabled by a wireless local loop of the A system, comprising a wireless unit, a modem unit, a TDMA control unit, a line interface unit, a timing control unit, and control means for controlling the whole, and the TDMA control unit includes: Based on the frame clock and the slot clock generated by the timing control unit based on the frame synchronization signal from the line interface unit, it recognizes which slot of the radio slot is being received, and for each radio slot, And a reception timing generation unit that changes a reception timing for notifying a timing for demodulation according to a distance from the subscriber and generates a reception enable signal. 2. A test mode for adjusting the reception timing for a subscriber located at a distance that interferes with the reception timing of the wireless slot is started, and the test mode is transmitted from the subscriber together with the subscriber ID. Receiving a continuous burst signal, determining the reception timing at which the subscriber ID can be acquired by shifting the reception timing at regular intervals during the reception of the continuous burst signal, and determining the determined reception timing as the reception timing for the subscriber 2. The radio base station according to claim 1, further comprising a reception test mode control unit that performs the operation. 3. A storage unit for storing reception timing data for each subscriber determined by the reception test mode control unit, wherein the reception timing data in the storage unit is managed by the control unit. 2. The radio base station according to 2. 4. A reception timing generation section includes a reception slot detection position change register for independently changing reception timing for each radio slot of each subscriber, and each reception slot detection position change register has a reception test mode. 2. The radio base station according to claim 1, wherein the reception timing data for each subscriber determined by the control means is set by the control means, and the reception timing for the subscriber is changed based on the setting data. 5. The TDMA control unit recognizes which slot of a radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and modulates and modulates the radio slot for each radio slot. 2. The radio base station according to claim 1, further comprising: a transmission timing generation unit configured to generate a transmission enable signal by changing a transmission timing for notifying the transmission timing according to a distance from a subscriber. 6. A test mode for adjusting transmission timing for a subscriber located at a distance that interferes with the reception timing of a wireless slot is started, and the test mode transmits the subscriber together with a subscriber ID. A continuous burst signal is received, and during the reception of the continuous burst signal, the transmission timing is shifted at regular intervals to determine a transmission timing at which the subscriber ID can be acquired, and the determined transmission timing is determined as a reception timing for the subscriber. 6. The radio base station according to claim 5, further comprising a transmission test mode control unit that performs the operation. 7. A storage unit for storing transmission timing data for each subscriber determined by the transmission test mode control unit, wherein the transmission timing data in the storage unit is managed by the control unit. 6. The radio base station according to 6. 8. The transmission timing generation unit includes a transmission slot position change register for independently changing transmission timing for each radio slot of each subscriber, and each transmission slot position change register includes transmission test mode control means. 6. The radio base station according to claim 5, wherein the transmission timing data for each subscriber determined in step (c) is set by the control means, and the transmission timing for the subscriber is changed based on the setting data. 9. The wireless communication system according to claim 3, wherein each data of the reception timing and the transmission timing managed by the control means is operable from network-side equipment connected via a line interface unit. base station. 10. TD access to fixed subscribers
A subscriber station for use in a radio base station enabled by a MA wireless local loop, wherein the radio base station controls a radio section, a modem section, a TDMA control section, a line interface section, a timing control section, and the whole. The TDMA control unit determines which slot of the radio slot is being received from the frame clock and the slot clock generated by the timing control unit based on the frame synchronization signal from the line interface unit. A reception timing generation unit for generating a reception enable signal by changing the reception timing for recognizing and notifying the modulation / demodulation unit of the timing for demodulation to the modem for each radio slot in accordance with the distance to the subscriber. The subscriber station used for the wireless base station. 11. A test mode for adjusting reception timing for a subscriber located at a distance that interferes with the reception timing of the wireless slot is started, and the test mode transmits the subscriber ID together with the subscriber ID. The subscriber ID is received by receiving a continuous burst signal and shifting the reception timing at regular intervals during the reception of the continuous burst signal.
11. The subscriber station used in the radio base station according to claim 10, further comprising: a reception test mode control unit that determines a reception timing at which the subscriber can obtain the reception timing, and determines the determined reception timing as a reception timing for the subscriber. 12. A storage unit for storing reception timing data for each subscriber determined by the reception test mode control unit, wherein the reception timing data in the storage unit is managed by the control unit. A subscriber station used for the radio base station according to 11. 13. The reception timing generation section includes a reception slot detection position change register for independently changing reception timing for each radio slot of each subscriber, and each reception slot detection position change register has a reception test mode. 11. The radio base station according to claim 10, wherein the reception timing data for each subscriber determined by the control means is set by the control means, and the reception timing for the subscriber is changed based on the setting data. Subscriber station. 14. The TDMA control unit recognizes which slot of a radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and modulates and modulates the radio slot for each radio slot. 2. A transmission timing generating section for generating a transmission enable signal by changing a transmission timing for notifying the timing of transmission according to a distance from a subscriber.
A subscriber station used for the radio base station described in 0. 15. A test mode for adjusting transmission timing for a subscriber located at a distance that interferes with the reception timing of the wireless slot is started, and the test mode transmits the subscriber together with the subscriber ID. A continuous burst signal is received, and during the reception of the continuous burst signal, the transmission timing is shifted at regular time intervals to change the subscriber ID.
15. The subscriber station used for a radio base station according to claim 14, further comprising transmission test mode control means for determining a transmission timing at which the transmission timing can be obtained and determining the determined transmission timing as a reception timing for the subscriber. 16. A storage unit for storing transmission timing data for each subscriber determined by the transmission test mode control unit, wherein the transmission timing data in the storage unit is managed by the control unit. 15. A subscriber station used for the wireless base station according to 15. 17. The transmission timing generation section includes a transmission slot position change register for independently changing transmission timing for each radio slot of each subscriber, and each transmission slot position change register includes transmission test mode control means. 2. The transmission timing data for each subscriber determined in the step (c) is set by the control means, and the transmission timing for the subscriber is changed based on the setting data.
A subscriber station used for the radio base station described in 0. 18. The wireless communication system according to claim 12, wherein each data of the reception timing and the transmission timing managed by the control means is operable from network-side equipment connected via a line interface unit. Subscriber station used for base station. 19. TD access to fixed subscribers
A radio system comprising a radio base station enabled by a wireless local loop of the MA system and a subscriber station used for the radio base station, wherein the radio base station includes a radio section, a modem section, and a TD.
MA control unit, line interface unit, timing control unit and control means for controlling the whole, the TDMA control unit, the frame clock generated by the timing control unit based on the frame synchronization signal from the line interface unit, While recognizing which slot of the radio slot is being received from the slot clock, the reception timing for notifying the modulation / demodulation unit of the timing for demodulation is changed for each radio slot in accordance with the distance from the subscriber. A radio system comprising a radio base station and a subscriber station used for the radio base station, comprising a reception timing generator for generating a reception enable signal. 20. A test mode for adjusting a reception timing for a subscriber located at a distance that interferes with the reception timing of a wireless slot is started, and the test mode is transmitted from the subscriber together with a subscriber ID. The subscriber ID is received by receiving a continuous burst signal and shifting the reception timing at regular intervals during the reception of the continuous burst signal.
20. A radio base station according to claim 19, further comprising: a reception test mode control means for determining a reception timing at which the subscriber can acquire the reception timing, and determining the determined reception timing as a reception timing for the subscriber. Radio system consisting of stations. 21. Storage means for storing reception timing data for each subscriber determined by the reception test mode control means, and the reception timing data in the storage means is managed by the control means. 201. A wireless system comprising the wireless base station according to 201 and a subscriber station used for the wireless base station. 22. A reception timing generation section comprising a reception slot detection position change register for independently changing reception timing for each radio slot of each subscriber, wherein each reception slot detection position change register has a reception test mode. 20. The radio base station according to claim 19, wherein the reception timing data for each subscriber determined by the control means is set by the control means, and the reception timing for the subscriber is changed based on the setting data. A wireless system consisting of the subscriber stations used. 23. The TDMA control unit recognizes which slot of a radio slot is being transmitted from the frame clock and the slot clock generated by the timing control unit, and modulates and modulates the radio slot for each radio slot. 2. A transmission timing generating section for generating a transmission enable signal by changing a transmission timing for notifying the timing of transmission according to a distance from a subscriber.
9. A wireless system comprising the wireless base station according to 9 and a subscriber station used for the wireless base station. 24. A test mode for adjusting transmission timing for a subscriber located at a distance that interferes with the reception timing of the radio slot is started, and the subscriber transmits the test mode together with the subscriber ID in this test mode. A continuous burst signal is received, and during the reception of the continuous burst signal, the transmission timing is shifted at regular time intervals to change the subscriber ID.
24. The radio base station according to claim 23, further comprising: transmission test mode control means for determining a transmission timing capable of acquiring the transmission timing, and determining the determined transmission timing as a reception timing for the subscriber. Radio system consisting of stations. 25. A storage unit for storing transmission timing data for each subscriber determined by the transmission test mode control unit, wherein the transmission timing data in the storage unit is managed by the control unit. 24. A wireless system comprising the wireless base station according to 24 and a subscriber station used for the wireless base station. 26. A transmission timing generation unit, comprising: a transmission slot position change register for independently changing transmission timing for each radio slot of each subscriber, wherein each transmission slot position change register includes transmission test mode control means. 2. The transmission timing data for each subscriber determined in the step (c) is set by the control means, and the transmission timing for the subscriber is changed based on the setting data.
9. A wireless system comprising the wireless base station according to 9 and a subscriber station used for the wireless base station. 27. The radio communication system according to claim 21, wherein each data of the reception timing and the transmission timing managed by the control means is operable from network-side equipment connected via a line interface unit. A wireless system consisting of a base station and a subscriber station used for the base station.