JP2002077027A - Subscriber wireless access system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subscriber wireless access system where wireless communication timing can be set with high accuracy by the processing of a subscriber station device side without the need for provision of a special processing sequence function to a base station device and the subscriber station device. SOLUTION: A terminal 3 connected to the subscriber station device 1 allows the subscriber station device 1 to wirelessly transmits a wireless communication timing adjustment signal used between the base station device 4 and the subscriber station device 1 to the base station device 4 in revised transmission timing for a plurality of number of times for each timing, counts number of reply times from the base station device 4 with respect to the timing adjustment signal by each timing and sets wireless communication timing used for normal operations to the subscriber station device 1 on the basis of the count of number of the reply times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a subscriber radio access system for performing radio communication between a fixed base station apparatus and a fixed subscriber station apparatus, and more particularly, to a radio communication system between a base station apparatus and a subscriber station apparatus. It relates to setting of wireless communication timing.

[0002]

2. Description of the Related Art A subscriber wireless access system (FWA:
Fixed Wireless Access is a base station that connects a terminal device such as a personal computer or a LAN accommodating a plurality of terminal devices to a subscriber station device and is connected to a backbone communication network such as a wide area network (WAN) or an ATM network. The device and the subscriber station device are wirelessly connected. Here, when a new subscriber station device is installed or when an abnormality occurs in wireless communication, the transmission / reception timing for the propagation delay according to the distance between the base station device and the subscriber station device is set. There is a need.

With respect to the setting of communication timing for such wireless communication, the following inventions have conventionally been proposed. The invention proposed as Japanese Patent Application No. 11-351828 discloses a method in which a base station apparatus wirelessly transmits a specific signal to a newly installed subscriber station apparatus, and in response, the subscriber station apparatus transmits a response signal. To the base station apparatus, the base station apparatus measures the timing shift from the response signal, notifies the subscriber station apparatus of a timing adjustment value for correcting the shift, and the subscriber station apparatus adjusts the adjustment value. The wireless transmission / reception timing is adjusted and set based on the above.

In the invention described in Japanese Patent Application Laid-Open No. 3-128532, a timing adjustment signal is transmitted from a slave station to a master station, and the master station detects a phase shift amount from the timing adjustment signal and notifies the slave station. After the slave station adjusts the phase shift based on the notification, it transmits the timing adjustment signal again to the master station, and the master station detects the bit shift amount from the timing adjustment signal, notifies the slave station, and notifies the slave station. The station adjusts the bit shift based on the notification.

The invention described in Japanese Patent Application Laid-Open No. 11-164353 discloses a method in which a subscriber station device attempts communication connection to a base station device, and the subscriber station device transmits a transmission timing when there is no response from the base station device. Changing the set value and retrying the communication connection is repeated until a response from the base station device is obtained.

[0006]

In the conventional invention in which the base station apparatus detects and notifies the amount of timing deviation or the like, the base station must be provided with such a processing sequence function. However, there has been a problem that the cost of the base station apparatus increases, or a new subscriber station apparatus cannot be newly added using an existing base station apparatus that does not have such a function. Further, in the conventional invention in which the subscriber station device changes the transmission timing set value until a response from the base station device is obtained, the 1
Since the transmission timing is set only by checking the number of times, it is difficult to set an accurate transmission timing because there is a radio propagation delay that may change depending on the communication environment in each case.

The present invention has been made in view of the above-mentioned conventional circumstances, and does not require a special processing sequence function in a base station apparatus or a subscriber station apparatus, or performs processing with high accuracy in a subscriber station apparatus side. An object of the present invention is to provide a subscriber wireless access system capable of setting wireless communication timing and a communication timing setting method thereof. Further objects of the present invention will be clear from the following description.

[0008]

In a subscriber radio access system according to the present invention, a terminal device connected to a subscriber station device adjusts a radio communication timing between a base station device and a subscriber station device. A function of changing the transmission timing of the signal to the subscriber station device and wirelessly transmitting the signal a plurality of times at each timing, a function of counting the number of responses from the base station device to the timing adjustment signal at each timing,
A function of setting the wireless communication timing used in the normal operation in the subscriber station apparatus based on the count value of the number of responses. Therefore, by the processing sequence function provided in the terminal device, it is possible to accurately set the wireless communication timing of the subscriber station device based on a plurality of responses from the base station device.

Further, in the subscriber radio access system according to the present invention, the subscriber station device detects the synchronization signal from the base station device with a predetermined detection width, and the terminal device obtains the maximum response count value. The transmission timing in the middle of the section is set as the wireless communication timing used for the subscriber station device in the normal operation. Therefore, the communication timing corresponding to the approximate center of the detection width of the subscriber station device can be set, and even if there is some influence of the propagation delay, good wireless communication between the subscriber station device and the base station device can be performed. Can be realized.

Further, in the subscriber wireless access system according to the present invention, the network diagnostic program PING (P
A timing adjustment signal is wirelessly transmitted to the IP address of the base station device by using an Internet Internet Grouper. Therefore, when the terminal device executes PING, the above-described wireless communication timing can be set without adding any special function to the base station device itself or the subscriber station device itself.

[0011] Further, according to the present invention, the transmission timing of the radio communication timing adjustment signal between the base station device and the subscriber station device is changed from the subscriber station device, and the radio signal is transmitted a plurality of times at each timing. The number of responses from the base station apparatus to the timing adjustment signal is counted for each timing, and the subscriber station apparatus sets a radio communication timing used in normal operation based on the count value of the number of responses. This is a communication timing setting method.
Furthermore, the present invention is a communication timing setting method for a subscriber wireless access system in which an intermediate transmission timing in a section in which the maximum number of response counts is obtained is set as a wireless communication timing used for normal operation in the subscriber station device. .

That is, the base station device can set the communication timing of the subscriber station device according to a processing sequence from the subscriber station device only by performing a normal process of returning a response. Note that the above-described setting method may be performed by providing the above-described processing sequence function in the subscriber station device without using the terminal device as described above.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described based on one embodiment shown in the drawings. FIG. 1 shows a configuration of a subscriber wireless access system according to the present example. The subscriber station unit (SU) includes an indoor unit (IDU) 1a installed inside the building of the subscriber, an outdoor unit (ODU) 1b installed at a high place (rooftop, etc.) outside the building of the subscriber, It has a cable 1c for connecting the indoor unit 1a and the outdoor unit 1b, and the indoor unit 1a has a hub (H).
UB), the terminal device 3 is connected to the outdoor unit 1
b communicates wirelessly with a base station device (BS) via an antenna. In this example, the subscriber station apparatus is divided into an indoor unit 1a and an outdoor unit 1b, each of which is in charge of a responsible function. However, these units may be integrated. The station device is generically described with reference numeral 1.

The base station apparatus (BS) includes an indoor unit (IDU) 4a installed inside the building, an outdoor unit (ODU) 4b installed at a high place outside the building, an indoor unit 4a and an outdoor unit 4b. The indoor unit 4a is connected to a backbone communication network 6 such as an ATM network via a router 6, and the outdoor unit 4b wirelessly communicates with the subscriber station device 1 via an antenna. In this example, the base station device is divided into an indoor unit 4a and an outdoor unit 4b, which share functions, but they may be integrated.
In the following description, the base station device is generically described with reference numeral 4 as needed.

Propagation delay or the like occurs in the wireless communication between the subscriber station apparatus 1 and the base station apparatus 4, and the wireless communication timing is set. This wireless communication is performed as shown in FIG. A time-division multiple access radio frame is used. This radio frame starts with Bc used for broadcast from its head.
h, a unit frame including Ach used for response, Rch used for request, Gch used for permission, and Dch used for data is continuous.

The Bch contains a synchronization signal, and the communication timing between the subscriber station apparatus (SU) 1 and the base station apparatus (BS) 4 is adjusted based on the synchronization signal. In such a case, the subscriber station device (SU) 1 cannot capture the synchronization signal at the initially set communication timing due to a spatial propagation delay that cannot be grasped in advance according to the communication environment, and the base station device (SU) BS)
4 cannot capture the signal from the subscriber station unit (SU) 1. Therefore, in this example, the terminal device 3 having the configuration for timing adjustment as shown in FIG. 3 is connected to the subscriber station device (SU) 1 to make the transmission timing optimal for the subscriber station device (SU) 1. Is set.

That is, the terminal device 3 changes the transmission timing of the radio communication timing adjustment signal between the base station device 4 and the subscriber station device 1 to the subscriber station device 1 and performs a plurality of times at each timing. An adjustment signal transmitting function 3a for wireless transmission, a response counter function 3b for counting the number of responses from the base station apparatus 4 to the timing adjustment signal for each timing, and a subscriber station apparatus based on the response frequency count value. 1 has a timing deriving function 3c for deriving wireless transmission timing used in normal operation, and a timing setting function 3d for setting the derived wireless transmission timing in the subscriber station device 1. Reference numeral 3e denotes a connection interface with the subscriber station device 1, and the hub is not shown.

The subscriber station apparatus 1 has a transmission / reception function 1d and a timing management function 1e for holding a transmission timing to the base station apparatus 4 as functions used for normal communication processing. 1d performs transmission processing to the base station apparatus 4 at the transmission timing set and held in the timing management function 1e during normal operation. 1 f is a connection interface with the terminal device 3. Here, in this example, the functions 3a to 3d for adjusting and setting the communication timing are provided in the terminal device 3. However, even if these functions 3a to 3d are provided in the subscriber station device 1, the setting method according to the present invention is realized. can do.

FIG. 4 shows a processing sequence performed by the terminal device (terminal) 3, the subscriber station device (SU) 1, and the base station device (BS) 4 for setting the transmission timing of the subscriber station device 1. It is. Here, in the present example, the functions 3a to 3d of the terminal device 3 correspond to the network diagnostic program PING.
And a timing adjustment signal (indicated as PING in the figure) is transmitted by the IP of the base station (BS).
It is transmitted wirelessly to the address.

In this example, the subscriber station (SU) has a function of receiving and recognizing the IP address of the base station (BS), and the terminal device 3 for this adjustment is shown in FIG. Such a screen is displayed and output on a display, and receives predetermined authentication information from an operator, and connects to a subscriber station apparatus (SU) by telnet or the like. Then, the terminal device 3 requests and obtains the IP address of the base station device (BS) from the subscriber station device (SU), outputs a screen as shown in FIG. 6 on a display, and receives input from the operator. Prompt. This screen is
It is possible to set the IP address of the BS, and it is also possible to set the mode for investigating the transmission / reception timing in detail or simply. By selecting the “adjustment start” button by the operator, The following transmission / reception timing setting process is activated.

When the "adjustment start" button is selected and the transmission / reception timing setting process is started, first, the terminal device 3 requests the subscriber station unit (SU) to set the first transmission / reception timing (1). Receiving the subscriber station equipment (S
U) sets the transmission / reception timing (1) in the timing management function 1e. Next, the terminal device 3 transmits a PING to the subscriber station device (SU) by the adjustment signal transmission function 3a, and the transmission / reception function 1d of the subscriber station device (SU) transmits the PING to the subscriber station device (SU).
ING at transmission / reception timing (1) base station apparatus (BS)
Wirelessly.

In this processing, since the transmission timing (1) of the subscriber station device (SU) matches the base station device (BS), the response notifying the reception of the PING from the base station device (BS) is received. A signal is wirelessly transmitted to the subscriber station (SU), the response signal is transmitted from the subscriber station (SU) to the terminal device 3, and the response counter function counts that the response has been received. The transmission of the PING at the transmission / reception timing (1) and the reception response count thereof are repeated a plurality of times (N times), and the timing derivation function 3c calculates the number of responses at the transmission / reception timing (1) obtained by the N repetitions. Tally.

In such processing, the terminal device 3 requests the subscriber station device (SU) to set the next different transmission / reception timing (m), and the subscriber station device (SU) sets the transmission / reception timing (m). ), The transmission and reception are repeated while sequentially changing the transmission and reception timing. If the transmission timing (m) of the subscriber station device (SU) does not match the base station device (BS), the base station device (BS)
Is the PIN wirelessly transmitted from the subscriber station (SU)
G cannot be received, and therefore, the terminal device 3 cannot receive a response signal to the transmitted PING via the subscriber station (SU) within a predetermined time, and the transmission of the PING takes time. As up, the next PING is transmitted at the same transmission timing (m).

The PI at such transmission timing (m)
The transmission of the NG and the waiting for the response are repeated N times, and the timing deriving function 3c totals the number of times the response signal is obtained at the transmission timing (m). FIG. 11 shows an example of the reception count result of the number of responses when the transmission / reception timing is sequentially changed from 10 to 0 to 190 and PING is transmitted 10 times at each transmission timing.

In the example shown in FIG.
In the section from to 150, PING was transmitted ten times and the response was received ten times, and the timing derivation function 3c determined the intermediate value (135, 130, or 14) during this period.
0) is derived as the timing to be set. And
The derived transmission timing is set in the timing setting function 3
d transmits it to the subscriber station apparatus (SU) and causes the timing management function 1e to hold the same, and causes the transmission / reception function 1d to perform wireless communication at the transmission timing held during normal operation.

Here, in the present invention, the transmission timing at which a response is obtained for a certain number of times or more or the transmission timing at which the maximum number of responses is obtained may be set for normal operation. If the transmission timing in the middle of the section in which the maximum number of response times is obtained as in this example is set as the wireless communication timing used in the normal operation in the subscriber station device, the subscriber station device (SU) And the ability of the base station apparatus (BS) to capture the synchronization signal is kept high. That is, as shown in FIG. 12, when the detection of the synchronization signal is performed with a certain width (for example, a timing width of 20 bits × 2), the transmission timing can be set at a timing substantially at the center of the detection width. Can be tolerated even if a propagation delay occurs.

When the above-described timing setting processing is completed, if the processing is normally completed, the completion of the timing is adjusted as shown in FIG. 7 and the timing setting is adjusted, and the inter-device distance between the base station apparatus and the subscriber station apparatus is adjusted. Is displayed on the display of the terminal device 3 for inquiring whether or not to switch to the normal operation mode to the worker, and the switching to the normal operation mode causes the base station device to communicate with the base station device at the timing set as described above. Wireless communication with the subscriber station device is performed.

If an error has occurred and the above-described timing setting process has been terminated halfway due to being out of the communication range, the timing setting process as shown in FIG. FIG. 9 when the process ends
Is displayed on the display of the terminal device 3. Also, if the operator selects “YES” or “OK” for the processing end notification as described above,
A screen as shown in FIG. 10 is displayed and output on the display of the terminal device 3, and when “YES” is selected, t
LOGOUT from elnet.

[0029]

As described above, according to the present invention, in the subscriber radio access system, the radio communication timing can be accurately set from the subscriber station apparatus side,
Further, such a timing setting process can be performed without adding a special function to the base station device or the subscriber station device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a subscriber wireless access system according to an example of the present invention.

FIG. 2 is a configuration diagram of a radio frame format according to an example of the present invention.

FIG. 3 is a diagram illustrating functions of a terminal device and a subscriber station device according to an example of the present invention.

FIG. 4 is a sequence chart illustrating a communication timing process according to an example of the present invention.

FIG. 5 is a diagram showing a screen display example according to an example of the present invention.

FIG. 6 is a diagram showing a screen display example according to an example of the present invention.

FIG. 7 is a diagram showing a screen display example according to an example of the present invention.

FIG. 8 is a diagram showing a screen display example according to an example of the present invention.

FIG. 9 is a diagram showing a screen display example according to an example of the present invention.

FIG. 10 is a diagram showing a screen display example according to an example of the present invention.

FIG. 11 is a diagram showing a result of counting the number of responses according to an example of the present invention.

FIG. 12 is a diagram illustrating a detection width of a synchronization signal according to an example of the present invention.

[Explanation of symbols]

1: subscriber station device, 1d: transmission / reception function, 1e: timing management function, 3: terminal device, 3a: adjustment signal transmission function, 3b: response counter, 3c: timing derivation function, 3d: timing setting function, 4: Base station equipment,

Claims (5)

[Claims] 1. A subscriber radio access system comprising a subscriber station device wirelessly connected to a base station device, wherein the terminal device is connected to the subscriber station device, wherein the terminal device comprises a base station device and a subscriber station. The function of changing the transmission timing of the radio communication timing adjustment signal to the subscriber station device to the subscriber station device and transmitting the radio signal a plurality of times at each timing, and the number of responses from the base station device to the timing adjustment signal. A function to count for each timing, a function to set the wireless communication timing used in normal operation to the subscriber station device based on the count value of the number of responses,
A subscriber wireless access system, comprising: 2. The subscriber wireless access system according to claim 1, wherein the subscriber station device detects a synchronization signal from the base station device with a predetermined detection width, and the terminal device obtains a maximum response count count value. A subscriber wireless access system, wherein a transmission timing in the middle of a given section is set as a wireless communication timing used for normal operation in a subscriber station device. 3. The subscriber wireless access system according to claim 1, wherein a network diagnostic program PING (Packet) is provided.
A subscriber wireless access system, which wirelessly transmits a timing adjustment signal to an IP address of a base station device using an Internet Grouper. 4. A subscriber radio access system having a subscriber station device wirelessly connected to a base station device, wherein a signal for adjusting radio communication timing between the base station device and the subscriber station device is transmitted to the subscriber station. The transmission timing is changed from the device and the radio transmission is performed a plurality of times at each timing, the number of responses from the base station device to the timing adjustment signal is counted at each timing, and the subscriber station is counted based on the count value of the number of responses. A communication timing setting method for a subscriber wireless access system, comprising: setting a wireless communication timing used in a normal operation in a device. 5. The communication timing setting method for a subscriber wireless access system according to claim 4, wherein the transmission timing in the middle of the section in which the maximum number of response times is obtained is used for the subscriber station device in normal operation. A communication timing setting method for a subscriber wireless access system, wherein the communication timing is set as communication timing.