JP2002271423A - Base-station equipment and method of transmitting and receiving data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide base-station equipment that can easily reduce the deterioration of transmission qualities even when the equipment burst-receives data from a base-station controller. SOLUTION: This base-station equipment is provided with a reception buffer 112, a receiving section 111 which successively receives communication data from the base-station controller and stores the data in the buffer 112, and an information processing section 113 which repeatedly performs reception that is performed until the processing of all communication data stored in the buffer 112 completes and transmission which is performed successively from the reception within a fixed period from the starting time of the reception. This equipment is also provided with a reception timer processing section 115 which instructs a transmitting section 117 to transmit a notice indicating that the processing time of reception exceeds a prescribed period of time when the processing time exceeds the prescribed period of time, and that the time assigned to the transmission may become insufficient when this state continues as it is to the base-station controller and the transmitting section 117 which transits the notice to the base-station controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus and, more particularly, to an ATM (Asynchronous Tra).
The present invention relates to a technique for transmitting and receiving data to and from a base station control device via an nsfer mode network.

[0002]

2. Description of the Related Art Conventionally, a mobile station has been used as a main device for providing a mobile communication service to a user of a radio telephone device (hereinafter, referred to as a "mobile station") such as a portable telephone and a PHS portable terminal. There is a base station apparatus that performs wireless communication with the base station apparatus, and a base station control apparatus that performs communication with the base station apparatus via an ATM network.

FIG. 10 shows such a base station apparatus 102.
1, 1022, 1023, etc. and base station controller 1030
It is a figure explaining the outline of. Base station devices 1021, 10
22, 1023, etc. are usually installed at a high altitude at an interval of 2 to 10 km and provided to a mobile station used in a communication area covered by the own device, for example, data such as voice, text, and image data and the like. Control information accompanying the data, that is, communication data, is transmitted and received by radio, and the base station control device 103 is connected via an ATM network.
0 transmits and receives communication data.

A base station controller 1030 controls a plurality of base station devices 1021, 1022, 1023, etc., communicates with these base station devices, and further controls other base station controllers, etc. Is a device that communicates with other nodes. That is, in conversations using mobile phones, communication data such as voice is transmitted to mobile stations, base station devices,
The transmission is performed in the order of the base station control device, another base station control device, another base station device, and the partner mobile station.

[0005] The base station control device 1030 and the base station device 1
The transmission of communication data with the devices 211, 1022, 1023, etc. is performed by transmitting and receiving communication data stored in ATM cells via an mutually connected ATM network. FIG. 11 is a functional block diagram of a conventional base station apparatus 1021, and also shows a base station control apparatus 1030.

[0006] The base station apparatus 1021 includes an ATM processing unit 12.
10, communication unit 1211 and reference timing generation unit 1230
And The reference timing generation unit 1230 is a timer independent of other functional units,
It is called “reference cycle”. In), a timing signal for notifying the processing timing of each functional unit is output to the communication unit 1211 and the ATM processing unit 1210.

[0007] Communication unit 1211 includes a buffer for temporarily storing data, and transmits communication data output from ATM processing unit 1210 to a mobile station used in communication area 1041 covered by base station apparatus 1021.
The communication data is transmitted wirelessly in synchronization with the phase and cycle of the timing signal, and the communication data is received wirelessly from the mobile station and output to the ATM processing unit 1210.

At this time, communication data coming from the mobile station to the communication unit 1211 is temporarily stored in a buffer in the communication unit 1211. The ATM processing unit 1210 is a device that converts a communication format of communication data and the like, and includes a receiving unit 1222, a reception buffer 1223, and an information processing unit 1.
224, a transmission buffer 1226, and a transmission unit 1227.

The receiving buffer 1223 and the transmitting buffer 1
226 is a buffer for temporarily storing communication data. The receiving unit 1222 includes the base station control device 1030
The ATM cell storing the communication data is received and stored in the reception buffer 1223. Also, the receiving unit 1222
Detects the amount of data in the reception buffer 1223, and if the amount of data is equal to or larger than the set threshold, sends a signal indicating that the amount of data is excessive (hereinafter, referred to as “excess data signal”) to the transmitting unit 1227. Output.

The information processing section 1224 includes a CPU and a ROM.
And the like, and performs processing for converting communication formats of voice, characters, images, and the like. More specifically, the information processing unit 1224 includes the reference timing generation unit 1
The timing signal input from 230 is used as a start trigger of a reception process described later, and two processes are performed for each reference cycle, that is, the transmission process is executed after the reception process.

Hereinafter, the receiving process will be described. The information processing unit 1224 assembles and assembles the ATM cells stored in the reception buffer 1223, that is, the communication data divided and stored in these ATM cells into one original information unit, while sequentially reading out the communication data. Convert the communication data into a communication format suitable for wireless communication,
The converted communication data is output to the communication unit 1211.

[0012] Such processing by the information processing section 1224 is called reception processing. Next, the transmission process will be described. The information processing unit 1224 sequentially reads out the communication data stored in the buffer in the communication unit 1211 after the above-described reception process ends, and performs an ATM operation on each communication data.
To a communication format suitable for communication by
The communication data is divided and stored in the TM cell,
The M cells are stored in the transmission buffer 1226.

The processing by the information processing section 1224 is called transmission processing. The reception processing is performed in the reception buffer 1223.
In order to avoid discarding ATM cells due to overflow, the priority is given to transmission processing, that is,
This is performed before the transmission processing within the reference cycle. For this reason, the longer the reception processing time is, the shorter the transmission processing time becomes, and the communication data remaining without being processed due to the shortage of the processing time of the transmission processing is processed in a later reference cycle. Therefore, the storage in the transmission buffer 1226 is delayed by that much, and the base station controller 1
030.

The transmission unit 1227 includes a transmission buffer 1226
The ATM cell stored in the base station controller 1
030. At this time, when an excess data signal is output from the receiving unit 1222, the transmitting unit 1227 adjusts the value of the bit indicating the presence or absence of congestion in the read ATM cell header to a value indicating the presence of congestion, and It transmits to the station control device 1030.

As described above, the conventional base station apparatus 1021
Transmits an ATM cell including information indicating a congestion state to the base station controller 1030 before overflow of the reception buffer 1223 occurs, interrupts the transmission of the ATM cell from the base station controller 1030 to the base station device 1021, and Communication is performed while avoiding overflow of the buffer 1223.

[0016]

However, the above prior art has the following problems. That is, in ATM communication, communication data may be transmitted and received in bursts. In the conventional base station apparatus, when burst reception is performed, overflow of the reception buffer 1223 is avoided by the above configuration. However, to receive a large amount of communication data instantaneously, the reception buffer 1
223 stores a large amount of communication data.

At this time, the base station devices 1021, 1022,
In 1023 and the like, since the reception process is performed on all communication data stored in the reception buffer, the time required for the reception process is prolonged, and as a result, the time allocated for the transmission process is shortened. When such a reduction in the transmission processing time occurs, the base station control apparatus 103 that performs the transmission processing
This delays the transmission of communication data to 0, impairs the real-time property of information processing, and may lead to deterioration of transmission quality.

Accordingly, the present invention has been made in view of the above problems, and has a base station apparatus and a data transmission / reception apparatus that can easily reduce deterioration of transmission quality even when data is received in bursts from a base station control apparatus. The aim is to provide a method.

[0019]

In order to achieve the above object, a base station apparatus according to the present invention transmits data for a base station controller to a base station controller via an ATM network. A base station device for receiving data for a base station from a control device, a receiving buffer, receiving means for sequentially receiving data for a base station from the base station control device and storing the data in the reception buffer, and A first process that is continuously performed on all stored base station data until the process is completed, and a second process that is performed following the first process within a certain period from the start of the first process. Processing means for repeatedly performing
When the processing time of the processing exceeds a predetermined time, to that effect,
And transmitting means for transmitting a notification to the base station control device indicating that there is a possibility that the time allocated to the second process may be insufficient in this state.

Further, the data transmitting / receiving method according to the present invention comprises:
In a base station apparatus having a buffer, a data transmitting / receiving method for transmitting data for a base station controller to a base station controller via an ATM network and receiving data for the base station from the base station controller, A receiving step of sequentially receiving base station data from the station control device and storing the data in the buffer; and a first step of continuously performing processing on all base station data stored in the buffer until the processing is completed. A process step of repeatedly performing a process and a second process following the first process within a certain period from the start of the first process, and a process time of the first process exceeding a predetermined time. And a transmitting step of transmitting a notification to the base station control device indicating that there is a possibility that the time allocated to the second processing may be insufficient in this state. And wherein the Mukoto.

[0021]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram of base station apparatus 100 according to the embodiment of the present invention. The base station apparatus 100 is installed at an altitude of 2 to 10 km at an outdoor high place, and controls mobile stations such as a mobile phone and a PHS mobile terminal, for example, data such as voice, text, and images, and control accompanying these data. Information, ie
This device transmits and receives communication data wirelessly, and transmits and receives these communication data to and from a base station controller via an ATM network.
0 and a reference timing generator 130.

The reference timing generator 130 is a timer independent of other functional units, and has a period of 10 msec,
That is, the timing signal is transmitted from the communication unit 120 to the AT in the reference cycle.
Output to M processing unit 110. The communication unit 120 includes a buffer for temporarily storing data, and the ATM processing unit 110
A process of transmitting communication data to the mobile station wirelessly to a mobile station within a communication area covered by the base station apparatus 100 from the communication data output from the base station device 100, and receiving the communication data from the mobile station wirelessly to an ATM processing unit. The processing to be output to 110 is performed in synchronization with the cycle of the timing signal.

The communication data coming from the mobile station to the communication unit 120 is temporarily stored in a buffer in the communication unit 120. The ATM processing unit 110 is a device that performs conversion of a communication format of data and the like.
Reception buffer 112, information processing section 113, reference timing generation section 130, reception processing timer processing section 115
, A transmission buffer 116, and a transmission unit 117.

The receiving buffer 112 and the transmitting buffer 11
Reference numeral 6 denotes a buffer for temporarily storing data. The receiving unit 111 is a circuit that receives data of an ATM cell unit arriving via an ATM network,
The communication data stored in the ATM cell is received from a base station controller (not shown) and stored in the reception buffer 112.

The receiving section 111 includes a receiving buffer 11
2. The data amount is acquired from 2 and stored in the reception buffer 112. When the data amount of the reception buffer exceeds the threshold value with 80% of the data capacity of the reception buffer 112 as a threshold, the reception unit 111 outputs a signal indicating that the data amount is excessive, that is, An excess data signal is output to transmitting section 117.

The information processing unit 113 includes a recording medium such as a CPU and a ROM, and a clock, and performs processing for performing conversion of communication format of communication data and the like in synchronization with the cycle of the timing signal. More specifically, the information processing unit 113 uses the timing signal output from the reference timing generation unit 130 as a start trigger of a reception process described later,
By the time of the next timing signal input, the following two processes,
That is, the receiving process and the transmitting process are executed in this order.

First, the above-described reception processing will be described.
The information processing unit 113 sequentially reads out the ATM cells stored in the reception buffer 112 until the reception buffer 112 becomes empty, and assembles the communication data divided and stored in the plurality of ATM cells into communication data before division. Then, the assembled communication data is converted into a data format suitable for wireless communication and output to the communication unit 120.

The information processing section 113 outputs a reception processing start notification to the reception processing timer processing section 115 when the reception processing is started, and outputs a reception processing end notification when the reception processing ends. Receiving processing timer processing unit 11
5 is output. Such processing by the information processing unit 113 is called reception processing. Next, the transmission process will be described.

After the above-described reception processing is completed, the information processing section 113 sequentially reads out the communication data stored in the buffer in the communication section 120 and converts the plurality of communication data into a data format suitable for communication by ATM. , That is, the communication data is divided and stored in ATM cells and output to the transmission buffer 116. Such processing by the information processing unit 113 is called transmission processing.

The information processing section 113 includes a reception buffer 112
In order to avoid discarding the ATM cells due to the overflow of as much as possible, the receiving process is performed before the transmitting process within the reference period of 10 msec. For this reason,
As the processing time of the reception processing becomes longer, the time allocated to the transmission processing decreases.

The reception processing timer processing section 115 is composed of hardware different from the information processing section 113 and functions independently of other functional sections, and receives a reception processing start notification from the information processing section 113. And the timer value is 4ms
ec, the countdown is started, the countdown is continued until a reception processing end notification is received from the information processing section 113, and the countdown is stopped when the reception processing end notification is received.

When the count value reaches 0 msec, that is, when the timer expires, the reception processing timer processing section 115 terminates the countdown and outputs a timeout signal to the transmission section 117. The transmitting unit 117
A circuit for transmitting data in units of TM cells, which reads out ATM cells stored in a transmission buffer 116 and outputs the ATM cells to a base station controller.

At this time, when an excessive data signal is output from the receiving unit 111, or when the reception processing timer processing unit 1
When the timeout signal is input from No. 15, the transmitting unit 117 sets the value of the first bit of the PT field existing in the read ATM cell header to “0, 1”,
That is, a value indicating the congestion state is output. On the other hand, when neither the data excess signal nor the timeout signal is input, the transmitting unit 117 sets the value of the bit of the PT field present in the read ATM cell header to “0,
0, * "(* is a value of 0 or 1), that is, a value indicating that there is no congestion state, and output.

The base station apparatus 100 configured as described above
At the end of the explanation of each part in
The cell fields will be described. FIG. 2 is a diagram showing a configuration of a field of an ATM cell. ATM cells are:
It consists of an ATM cell header and a payload. AT
The M cell header is a 4-bit GFC (Generic).
FlowControl) field and 8-bit V
PI (Virtual Pass Identifier)
r) field and a 16-bit VCI (Vertua
l Channel Identifier (PT) field, 3-bit Payload Type (PT) field, and 1-bit CLP (Cell Loss)
Priority) field and 8-bit HEC
(Header Error Control) field.

On the other hand, the payload is a 48-byte field in which communication data such as voice, characters, and images are stored. Information indicating the congestion state is stored in the above-described PT field. The PT field may be used as a field for storing user information, or may be used for other purposes. The information indicating the congestion state may be used as a field for storing user information. In that case, 3 in the PT field
In one of the bits, a value “0” indicating that this PT field is used as a field for storing user information is stored, and in the next bit, a value indicating presence / absence of congestion, that is, presence of congestion In this case, “1” is stored, and if there is no congestion, “0” is stored.

In the remaining one bit in the PT field following the above-mentioned "0, 0" or "0, 1", information irrelevant to the presence or absence of congestion that can be arbitrarily determined by the user is stored. obtain. That is, when indicating a state with congestion, the PT field stores a value of “0, 1, *” (* is 0 or 1), and when indicating a state without congestion, The PT field stores a value of “0, 0, *” (* is 0 or 1).

Next, processing of each functional unit in base station apparatus 100 will be described. FIG. 3 is a flowchart showing the processing in the receiving unit 111. The receiving unit 111 receives an ATM cell storing communication data such as voice, text, and image from a base station control device (not shown) (step S
80), the received ATM cells are stored in the reception buffer 112 (step S81), the amount of data in the reception buffer 112 is detected (step S82), and it is determined whether or not this data amount is equal to or larger than a threshold value (step S83).

If the data amount is equal to or larger than the threshold value, the receiving section 111 starts outputting an excess data signal to the transmitting section 117 (step S84), and the first step S80 for receiving the communication data stored in the ATM cell. Return to On the other hand, when the data amount of the reception buffer 112 is less than the threshold, the output of the excess data signal is stopped (step S85), and the first step S1 for receiving the communication data stored in the ATM cell.
Return to 80.

If the excess data signal is not output, the first step S80 of receiving an ATM cell is performed.
Return to FIG. 4 is a flowchart illustrating a process in the information processing unit 113. When receiving the timing signal from the reference timing generation unit 130 (step S101), the information processing unit 113 outputs a reception processing start notification to the reception processing timer processing unit 115 and starts the reception processing (step S102). ATM in buffer 112
When the reception processing is completed for all the cells, a reception processing end notification is output to the reception processing timer processing unit 115 (step S103), and then the transmission processing is started (step S104).

When the next timing signal is received from the reference timing generator 130 (step S10)
5) The information processing section 113 determines whether or not the transmission processing is being performed (step S106), and outputs a reception processing start notification to the reception processing timer processing section 115 when the transmission processing has already been completed. At the same time, the process returns to step S102 to start the receiving process.

On the other hand, if the transmission process is being performed, the transmission process is terminated (step S107), a reception process start notification is output to the reception process timer processing unit 115, and the process returns to step S102 to start the reception process. FIG. 5 is a flowchart showing the processing in the reception processing timer processing unit 115.

Upon receiving the reception processing start notification from the information processing section 113 (step S111), the reception processing timer processing section 115 sets the timer set value to a determined value, for example, 4 msec (step S112), and counts down. Is started (step S113). And
The reception processing timer processing unit 115 determines which of the expiration of the timer (timer value = 0) and the reception of the reception processing end notification, that is, the end of the reception processing, is earlier (step S1).
14) If the receiving process ends before the timer expires, the countdown is stopped (step S115), and it is determined whether a timeout signal is currently being output (step S116). ,
The process returns to the first step S111 of receiving the reception processing start notification from the information processing unit 113.

On the other hand, if the timeout signal is being output, the reception processing timer processing unit 115 stops outputting the timeout signal to the transmission unit 117 (step S11).
7), the process returns to the first step S111 of receiving the reception processing start notification from the information processing unit 113. In addition, in step S114 to determine whether the expiration of the timer or the end of the reception processing is earlier, the reception processing timer processing unit 115 stops the countdown if the expiration of the timer is earlier than the end of the reception processing. (Step S118), output of a timeout signal to the transmission unit 117 is started (step S119).

FIG. 6 is a flowchart showing the processing in the transmitting section 117. The transmission unit 117 reads the ATM cell storing the communication data from the transmission buffer 116 (step S120), determines whether a timeout signal or an excessive data signal is currently being received (step S121), If the data excess signal is being received, the bit pattern of the PT field in the ATM cell header is set to "0, 1, *" (* is 0 or 1), that is, congestion is present (step S122), and this ATM is The cell is transmitted to the base station controller (step S1).
23), and return to step S120 of reading communication data from the transmission buffer 116.

On the other hand, when the timeout signal or the excessive data signal is not being received, the transmitting unit 117 sets the bit pattern of the PT field in the ATM cell header to “0, 0,
"*" (* Is 0 or 1), that is, there is no congestion (step S122), the ATM cell is transmitted to the base station controller (step S123), and the process returns to step S120 of reading communication data from the transmission buffer 116. .

FIG. 7 shows the processing status of the reception processing and the transmission processing, the operation state of the reception processing timer processing unit 115, and the PT field of the ATM cell transmitted from the transmission unit 117 during normal reception, that is, other than the burst reception. FIG. 6 is a diagram showing a relationship with a congestion display state in FIG. At the time of normal reception, the arrival timing of ATM cells varies moderately, so that the amount of data in the reception buffer 112 is a problem-free amount, and the information processing unit 113 sets the reference period (t _s ).
Within, the receiving process and the transmitting process can be completed.

More specifically, the reception processing timer processing section 115 starts the countdown of the reception processing timer together with the start of the reception processing by the information processing section 113 (processing start time t ₀ ). Reception processing end time t _1, the count value is 0
And turned to arrive earlier than the time t ₂ when the countdown is completed, the reception processing timer processing unit 115 does not output a timeout signal to the transmission unit 117, and the original value indicating the value congestion bit of PT field If it is not (hereinafter, referred to as “congestion display is not performed”), the state remains where no congestion display is performed.

FIG. 8 shows the processing status of the reception processing and the transmission processing immediately after the burst reception and the reception processing timer processing unit 1.
15 is a diagram illustrating a relationship between an operation state of No. 15 and a congestion display state in a PT field of an ATM cell transmitted from a transmission unit 117. FIG. In the burst reception, since the arrival timing of the ATM cells is biased, the reception buffer 1
Many amount of data in 12, the information processing unit 113, the reference period (t _s) in, it is impossible to complete all the reception processing and transmission processing.

More specifically, the reception processing timer processing unit 1
15 starts the countdown of the reception processing timer together with the start of the reception processing by the information processing section 113 (processing start time t ₀ ). Reception processing end time t _1, the count value is 0
And is for coming in after the time t ₂ when the countdown is completed, the reception processing timer processing unit 115, the time t ₂
In, the output of the timeout signal to the transmission unit 117 is started.

Therefore, after time t ₂ , the value of the bit of the PT field becomes a value indicating the congestion state by transmitting section 117 (hereinafter, referred to as “congestion is displayed”). The base station control device that has received the ATM cell on which the congestion is displayed stops transmitting the ATM cell to the base station device 100. In this reference period, the time t _r necessary for the receiving process is longer than the time t _d required to transmit processing.

FIG. 9 shows the processing status of the reception processing and the transmission processing and the reception processing timer processing section 115 after the base station control device stops the transmission of the ATM cells due to the reception of the ATM cell indicating the congestion. FIG. 6 is a diagram showing a relationship between the operating state of the ATM cell and the congestion display state in the PT field of the ATM cell transmitted from the transmitting unit 117. After the transmission of the ATM cell by the base station controller is stopped, the communication data other than the communication data received during the time lag until the ATM cell for which congestion is displayed arrives at the base station controller is not received. less data in the buffer 112, the information processing unit 113, a reference period (t _s)
After the reception processing is completed in a short time due to the small amount of data, the transmission processing that cannot be completed in the previous reference cycle and the transmission processing that must be processed in the reference cycle are performed together.

More specifically, the reception processing timer processing section 115 starts the countdown of the reception processing timer at the same time that the reception processing by the information processing section 113 is started (processing start time t ₀ ). Reception processing end time t _1, the count value is 0
Becomes to arrive earlier than the time t ₂ when the countdown is completed, the reception processing timer processing unit 115 stops the output to the transmitting portion 117 of the time-out signal.

Since the state of congestion is displayed in the previous cycle and the state continues until the present time, the state where the congestion is not displayed due to the stop of the output of the timeout signal at the reception processing end time t ₁ is set. Become. As described above, according to the present embodiment, in base station apparatus 100, when the time of the reception processing in information processing section 113 is longer than the determined time, the base station control apparatus performs the processing within the reference period for performing the reception processing. The congestion information for stopping the transmission of the communication data is stored in the ATM cell and transmitted to the base station controller. That is, by detecting the congestion state of the information processing unit 113 in the base station apparatus 100 in the burst reception, which cannot be performed by the conventional configuration, and notifying the congestion state to the base station control apparatus, communication from the base station control apparatus is performed. Data transmission can be interrupted.

As a result, delays in the reception processing and the transmission processing are reduced, and deterioration in transmission quality is reduced. In addition,
In the present embodiment, transmitting section 117 stores information indicating the congestion state in the PT field. However, the present invention is not limited to this field.
For example, it may be stored in a GFC field or an ATM payload.

In this case, the base station controller stops and restarts the transmission of communication data with reference to the field storing the information indicating the congestion state. Also,
In the present embodiment, the base station control device interrupts transmission of communication data to the base station device 100 when the congestion display in the PT field of the ATM cell received from the base station device 100 indicates that there is congestion. It is not always necessary to limit to interruption.

For example, when the congestion indication in the PT field indicates that there is congestion, the base station controller issues a warning to the ATM network administrator indicating that the transmission quality of the transmission processing in the base station apparatus 100 may be degraded. It may be a management measure such as notification. Further, in the present embodiment, the reference period is set to 10 msec, and the set value of the reception processing timer processing unit 115 is set to 4 msec. However, the present invention is not limited to these values, and the set value is set to the value of the reference period. It only needs to be a realistic value that is smaller than that and can secure the time for the transmission process.

Further, in the present embodiment, the threshold value for determining whether or not to output the excessive data signal from the receiving section 111 is set to 80% of the data capacity of the receiving buffer 112. However, the present invention is not limited to this value. You may.

[0058]

As is apparent from the above description, the base station apparatus according to the present invention transmits data for the base station controller to the base station controller via the ATM network, and transmits the data to the base station controller from the base station controller. A base station device for receiving data for stations, comprising: a reception buffer; receiving means for sequentially receiving data for base stations from the base station control device and storing the data in the reception buffer; A first process that is continuously performed on all base station data until the process is completed, and a second process that is performed following the first process within a certain period from the start of the first process is repeatedly performed. And a notification indicating that when the processing time of the first processing exceeds a predetermined time, and that the time allocated to the second processing may be insufficient if the processing time of the first processing is left as it is. Transmitting means for transmitting data to the base station controller; and a data transmitting / receiving method according to the present invention, wherein in the base station device having a buffer, the base station controller transmits the data to the base station controller via an ATM network. A data transmission / reception method for transmitting data for the device and receiving data for the base station from the base station control device, and receiving the data for the base station sequentially from the base station control device and storing the data in the buffer, A first process that is continuously performed until the process is completed for all base station data stored in the buffer;
A process step of repeatedly performing a second process following the first process within a certain period from the start of the first process, and a process step when the processing time of the first process exceeds a predetermined time. And transmitting a notification to the base station control device indicating that there is a possibility that the time allocated to the second process may be insufficient if this is the case.

Thus, when the processing time of the first processing corresponding to the receiving processing in the present embodiment exceeds a predetermined time, the fact and the second processing corresponding to the transmitting processing in the present embodiment as it is. It is recognized by the base station controller that there is a possibility that the time allocated to the base station may be insufficient. If the base station control device that has performed the recognition interrupts the transmission of the data for the base station to the base station device, the data for the base station received by the receiving means is interrupted, and in a later cycle, the first The processing time of the processing is promptly reduced, and as a result, the processing time of the second processing is secured.

For this reason, in the processing performed through the second processing, problems such as processing delay hardly occur.
Assuming that the transmission of the data for the base station controller to the base station controller is performed through the second process, the real-time transmission of the data for the base station controller is substantially maintained, and the deterioration of the transmission quality is reduced. It is reduced. Further, the base station control device, while receiving the notification, to interrupt the transmission of data for the base station to the base station device,
The transmission unit may repeat transmission of the notification, and stop transmitting the notification when the first processing is completed without exceeding the predetermined time.

Thus, from the start of the transmission of the notification,
Until the first processing is completed without exceeding the predetermined time, data for the base station received by the receiving means is interrupted, and in a later cycle, the processing time of the first processing is reduced. It is planned immediately. Further, the processing means includes a CPU, and the first means is operated by the CPU.
Performing a process and a second process, wherein the transmitting means
The transmission may be performed by another hardware that does not include U.

Thus, by using a different hardware configuration from the processing means, the load of the processing performed by the CPU of the processing means can be reduced, and the processing time of the first processing and the second processing can be reduced. Can be Further, the base station apparatus further includes a transmission buffer, and acquisition means for externally acquiring data for the base station control apparatus, wherein the data for the base station received by the receiving means is divided and stored in an ATM cell. The first process includes a process of assembling a set of base station data divided and stored in a plurality of ATM cells and restoring the data to one base station data before division, and the second process includes: A process of dividing and storing data for the base station controller into ATM cells and storing the data in the transmission buffer, wherein the transmitting unit sequentially transmits the ATM cells stored in the transmission buffer to the base station controller. The transmission of the notification may be performed by including the notification in the ATM cell.

By including the notification in the ATM cell transmitted to the base station controller by the transmitting means, if the processing time of the second processing to the base station controller continues as it is, the second processing The notification that there is a possibility that the real-time property of the processing performed through the process may not be ensured is easily performed. The inclusion is performed by setting a value of a predetermined flag in an ATM cell to a first value,
When the inclusion is not performed, the value of the predetermined flag may be a second value different from the first value.

Thus, whether or not there is a possibility that the shortage of the processing time of the second processing will continue is determined by the flag in the ATM cell. Further, the flag is composed of predetermined bits indicating the presence or absence of congestion in the PT field present in the ATM header, and the first value indicates that there is congestion, and the second value indicates that there is no congestion. Good.

As a result, by referring to only the PT field of the ATM cell header, it is determined whether there is a possibility that the shortage of the processing time of the second process will continue. Further, the flag may include a predetermined bit in a GFC field existing in an ATM header. Thus, by referring to only the GFC field of the ATM cell header, it is determined whether there is a possibility that the shortage of the processing time of the second process will continue.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a base station device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a field of an ATM cell.

FIG. 3 is a flowchart illustrating processing in a receiving unit.

FIG. 4 is a flowchart illustrating a process in an information processing unit.

FIG. 5 is a flowchart illustrating processing in a reception processing timer processing unit.

FIG. 6 is a flowchart illustrating processing in a transmission unit 117.

FIG. 7 shows processing states of reception processing and transmission processing, an operation state of a reception processing timer processing part, and a congestion display state in a PT field of an ATM cell transmitted from a transmission part during normal reception, that is, other than burst reception. FIG.

FIG. 8 is a diagram showing a relationship between a processing status of a reception process and a transmission process, an operation state of a reception process timer processing unit, and a congestion display state in a PT field of an ATM cell transmitted from a transmission unit immediately after burst reception. .

FIG. 9 shows the processing status of reception processing and transmission processing and the operation state of the reception processing timer processing unit 115 after the transmission of the ATM cells by the base station controller is stopped due to the reception of the ATM cell indicating the congestion. And the transmission unit 11
FIG. 7 is a diagram showing a relationship with a congestion display state in a PT field of an ATM cell transmitted from No. 7;

FIG. 10 is a diagram illustrating an overview of a base station device and a base station control device.

FIG. 11 is a functional block diagram of a conventional base station device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 base station apparatus 110 ATM processing unit 111 reception unit 112 reception buffer 113 information processing unit 115 reception processing timer processing unit 116 transmission buffer 117 transmission unit 120 communication unit 130 reference timing generation unit

Claims (8)

[Claims] 1. An ATM (Asynchronous T)
a base station that transmits data for the base station controller to the base station controller via a transfer mode network, and receives data for the base station from the base station controller. Receiving means for sequentially receiving data for the base station from the device and storing the data in the reception buffer; and a first means for continuously performing processing on all the data for the base station stored in the reception buffer until the processing is completed. Processing means for repeatedly performing a process and a second process following the first process within a certain period from the start of the first process; and when the processing time of the first process exceeds a predetermined time. Transmission means for transmitting to the base station controller a notification to that effect and that there is a possibility that the time allocated to the second processing may be insufficient if the state is left as it is. The base station apparatus according to claim. 2. The method according to claim 1, wherein the base station control device interrupts transmission of data for the base station to the base station device while receiving the notification. The transmitting unit transmits the notification. 2. The base station apparatus according to claim 1, wherein when the first processing is completed without exceeding the predetermined time, transmission of the notification is stopped. 3. The processing means includes a CPU.
The first processing and the second processing are performed by a calculation by a PU, and the transmission unit performs the transmission by another hardware not including the CPU.
The base station device according to claim 1. 4. The base station apparatus further includes a transmission buffer, and an acquisition unit for acquiring data for a base station controller from outside, and the base station data received by the reception unit is divided into ATM cells. The first process includes a process of assembling a set of base station data divided and stored in a plurality of ATM cells and restoring the data to one base station data before division, and the second process. Transmits the data for the base station controller to the AT
A process of dividing the data into M cells and storing the divided data in the transmission buffer;
3. The method according to claim 2, wherein TM cells are sequentially transmitted to the base station controller, and the transmission of the notification is performed by including the notification in the ATM cell.
The base station device as described in the above. 5. The method according to claim 1, wherein the inclusion is performed by setting a value of a predetermined flag in an ATM cell to a first value, and when the inclusion is not performed, the value of the predetermined flag is set to a first value.
5. The base station apparatus according to claim 4, wherein the second value is different from the second value. 6. The flag is composed of predetermined bits indicating presence / absence of congestion in a PT (Payload Type) field present in an ATM header, a first value indicating congestion, and a second value indicating congestion. The base station apparatus according to claim 5, wherein the base station apparatus indicates that there is no communication. 7. The flag includes a GFC (Generic Flow Control) in an ATM header.
6. The base station apparatus according to claim 5, comprising predetermined bits in a field. 8. A base station device having a buffer,
ATM (Asynchronous Transfer)
Mode) A data transmission / reception method for transmitting data for a base station controller to a base station controller via a network and receiving data for the base station from the base station controller. A receiving step of sequentially receiving data and storing the data in the buffer; a first processing continuously performed until processing is completed for all base station data stored in the buffer; A processing step of repeatedly performing a second processing that is performed following the first processing within a certain period from the start, and when the processing time of the first processing exceeds a predetermined time, and to that effect, Transmitting a notification to the base station controller indicating that the time allocated to the second process may be insufficient. Method.