JP2001333446A - Transmission delay control device in mobile communication system and transmission delay control method in mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce delay in discarding user frames by completing transmission delay control from a base station control device to a signal processing device in a short time, thereby preventing deterioration of communication quality. thing. SOLUTION: A transmission delay control frame is defined between a base station control device 104 and a signal processing device 108, and the base station control device 104 performs transmission between the base station device (any of 102-1 to 102-n). When the delay control is performed, the signal processing device 1
08, a transmission delay control frame is transmitted. The signal processing device 108 that has received the transmission delay control frame changes the time used as a criterion for delay arrival according to the content of the transmission delay control frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission delay control of a data transfer channel between a base station apparatus and a base station control apparatus for performing radio communication with a mobile station apparatus such as a portable telephone, or a wired transmission with the base station control apparatus. Processing apparatus for performing signal processing of audio data, image data, and the like, and a transmission delay control apparatus and a mobile communication system in a mobile communication system for performing transmission delay control of a data transfer channel between base station controllers In the transmission delay control method.

[0002]

2. Description of the Related Art First, the definition of transmission delay control will be described. Transmission delay control between the base station device and the base station control device is that when user data is transmitted as a radio frequency signal when the base station device for data transmission / reception is changed, data is transmitted within the base station device. The purpose is to adjust the data transmission timing from the base station control device to the base station device so that the delay time from input to transmission is reduced.

[0003] Transmission delay control between a base station control device and a signal processing device means that a base station device to which data is transmitted and received changes. At this time, a user frame to the signal processing device is increased due to an increase in transmission delay. When the arrival timing is fixedly delayed with respect to the reference before the base station device change, the time used as the reference for the late arrival determination is changed so that the arrival is not determined to be late.

FIG. 6 is a block diagram showing a configuration of a conventional mobile communication system.

The mobile communication system shown in FIG. 6 includes a mobile station device 601 in a communication area, a plurality of base station devices 602-1 to 602-n for performing radio communication with the mobile station device, and a base station device 602. -1 to 602-n are connected to the wired transmission path 60.
3-1 to 603-n, a base station controller 604 that performs overall control, and the base station controller 604 and the fixed network 605.
And a signal processing device 608 that performs signal conversion processing on user data such as audio data and image data based on codec and a protocol conversion algorithm. I have.

Each of the devices 602-1 to 602-n, 604,
For signal transmission between 608 and 605, a 5-byte header including destination information and the like is added to data, and ATM (Asynchronous) is transmitted.
ousTransfer Mode).

As a protocol applied to assembling and disassembling ATM cells, ITU-T Recommendation I.T. 363.2 and I.P. AAL Type2 specified in 366.1 is used.

Here, FIG. 7 shows a transition of a frame format until a frame is assembled into cells by applying the AAL Type 2 protocol, and the description will be given.

Referring to FIG. 7, reference numeral 701 denotes a frame; This shows a state where the frame is divided into 45 octets or less according to the processing procedure of 366.1. 703 indicates that the divided frame has I.O. 36
3 shows a CPS packet to which a specified CPS packet header is added. 704 is the A of 5 octet
The I.T. 363.2 STF (Start
Field: 1 octet) and an ATM cell in which the CPS packet is multiplexed.

FIG. 8 is a block diagram showing the configuration of the conventional base station controller 604 shown in FIG.

[0011] The base station controller 604 shown in FIG.
Base station side transmission path I / F means 801, uplink cell disassembly means 802, frame selection means 803, uplink cell assembling means 804, signal processing apparatus side transmission path I / F means 805
, Downlink cell disassembly means 806, and frame duplication means 80
7, a downlink cell assembling means 808, and a base station controller transmission delay control processing means 809.

The base station controller transmission delay control processing means 809 comprises an upstream transmission delay control frame processing means 810
And a downlink transmission delay control frame generating means 811 and a base station-side data transmission timing control means 812.

The base station side transmission path I / F means 801 is connected to the base station apparatuses 602-1 to 602-n and the transmission paths 603-1 to 603-1.
Cell transmission / reception is performed via 03-n. The uplink cell disassembly means 802 includes a base station side transmission path I / F means 80
1 to reconstruct a user frame from a cell received through the cell 1.

The frame selecting means 803 selects a desired frame from the restored frames of the base station devices 602-1 to 602-n based on a frame selection algorithm. However, the algorithm used to select the frame is not specified.

The upstream cell assembling means 804 assembles the selected frame into cells again. The signal processing device-side transmission path I / F unit 805 transmits and receives cells to and from the signal processing device 608 via the transmission path 606.

Downlink cell disassembly means 806 is connected to transmission line 606
A user frame is restored from the cell received by the signal processing device side transmission path I / F means 805 from the signal processing device 608 via the. The frame duplication unit 807 duplicates the restored frame. Downlink cell assembling means 808 assembles each of the copied frames into cells again.

Base station controller transmission delay control processing means 80
9 performs transmission delay control processing of a data transfer channel between each of the base station devices 602-1 to 602-n and the base station control device 604.

FIG. 9 is a block diagram showing the configuration of the conventional signal processing device 608 shown in FIG.

The signal processor 608 shown in FIG. 9 includes a base station controller-side transmission path I / F unit 901, an uplink cell disassembly unit 902, an uplink signal processing unit 903, an uplink cell assembling unit 904, Network side transmission path I / F means 905
, Downlink cell decomposing means 906, and downlink signal processing means 90
7, the downstream cell assembling means 908, and the late arrival determining means 90
9 and a late arrival determination reference value changing means 910.

Transmission line I / F means 901 on the base station controller side
Is for transmitting and receiving cells to and from the base station controller 604 via the transmission path 606. Up cell decomposition means 902
Is for restoring a frame from a cell received via the base station controller-side transmission path I / F means 901.

The late arrival determining means 909 detects the late arrival of the user frame and outputs complementary data to the upstream signal processing means 903. Delay arrival determination reference value changing means 910
Is to change the reference time for the delayed arrival determination of the next user frame by the delayed arrival determining means 909 when the delayed arrival is detected a predetermined number of times (hereinafter referred to as the number of delay detection protection stages).

The upstream signal processing unit 903 performs protocol conversion, speed conversion processing, and the like for matching the user frame input from the upstream cell disassembly unit 902 with the fixed network 605 of the communication destination.

The upstream cell assembling means 904 is for assembling data input from the upstream signal processing means 903 into cells. The fixed network-side transmission path I / F means 905 transmits and receives cells via the fixed network 605 and the transmission path 607.

Downlink cell disassembly means 906 is for restoring a frame from a cell received via fixed network side transmission path I / F means 905. Downlink signal processing means 907 includes:
It performs codec processing for matching the user frame input from the downlink cell disassembly unit 906 with the mobile station device 601. Downlink cell assembling means 908 includes:
This is to assemble data input from the downstream signal processing means 907 into cells.

FIG. 10 is a block diagram showing a configuration of the conventional base station apparatuses 602-1 to 602-n shown in FIG.

The base station devices 602-1 to 60-2 shown in FIG.
2-n denotes an antenna unit 1001 for transmitting and receiving wireless data to and from the mobile station device 601, and a transmitting and receiving amplifying unit 100
2, a radio transmission / reception unit 1003, a baseband signal processing unit 1004, a cell assembling unit 1005, a transmission line I / F unit 1006, a cell disassembly unit 1007, and a base station transmission delay control processing unit 1008. It is configured.

The transmission / reception amplification means 1002 amplifies data transmitted and received by the antenna means 1001.
The wireless transmitting / receiving means 1003 converts the received data into an A / D (Analo
g / Digital) and D / A (Digital / A)
nalog).

The baseband signal processing means 1004 performs error correction coding, framing, data modulation,
In addition to performing spread modulation, it performs despreading of received data, chip synchronization, error correction coding, demultiplexing of data, and the like.

The cell assembling means 1005 converts received data into cells. The transmission path I / F means 1006
Base station controller 604 and transmission paths 603-1 to 603-n
The cell is transmitted and received via the.

The cell disassembly means 1007 includes the I / F means 10
The received cell at 06 is decomposed to restore the frame. The base station transmission delay control processing means 1008 outputs an uplink transmission delay control frame to the cell assembling means 1005 when receiving a downlink transmission delay control frame.

Next, the fixed network 605 is sent from the mobile station device 601.
A data transmission method in the side direction (upward direction) will be described.

When the base station apparatuses 602-1 to 602-n receive the radio frequency signal transmitted from the mobile station apparatus 601 by the antenna means 1001, the base station apparatuses 602-1 to 602-n amplify the received signal by the transmission / reception amplification means 1002 and the radio transmission / reception means 1003 A
After performing the / D conversion, the baseband signal processing means 100
In step 4, baseband signal processing is performed.

This baseband signal processing is specified in units of 10 ms, such as a predetermined interval ｛usually 10 ms, 40 ms, or the like. Thereafter, this interval is defined as TTI (Time Transmission
Interval), the data subjected to the baseband processing is output to the cell assembling means 1005 as a user frame.

The cell assembling means 1005 converts the received data into user frame cells, and
6 to transmission lines 603-1 to 603-n.

Next, the base station control device 604
03-1 to 603-n to base station side transmission path I / F means 8
01, the cell is received via the upstream cell disassembly means 80.
In step 2, the user frame is restored.

Each of the restored base station devices 602-1 to 602-1
One user frame is selected by the frame selection means 803 from the user frames 602-n based on the frame selection algorithm. For example, assume that the user frame of the base station device 602-1 is selected.

The selected user frame is converted into cells again by the upstream cell assembling means 804, and the cells are transmitted to the transmission path 606 via the signal processing apparatus side transmission path I / F means 805.

Next, the signal processing device 608 is connected to the transmission line 60.
When a cell is received from the base station 6 via the base station controller side transmission path I / F unit 901, the user frame is restored in the uplink cell disassembly unit 902 and transmitted to the uplink signal processing unit 903. Note that the frame restored here is a user frame transmitted in one TTI time in the base station device 602-1.

The delay arrival determining means 909 determines the Nth user frame arrival deadline after connection setting (hereinafter referred to as a delay arrival determination reference value) as the delay time of the (N-1) th user frame after connection setting. Is used to set “the delay determination reference value of the (N−1) th user frame after connection setting + TTI”, and whether or not the next user frame arrives by the set delay determination reference value is monitored. And
If it has not arrived, processing to determine that it is late arrival is performed.

When it is determined that the vehicle is late, the late arrival determining means 90
Reference numeral 9 outputs complementary data (for example, all 1s) for one user frame to the upstream signal processing unit 903. At this time, the upstream cell disassembly unit 902 discards the next restored one user frame.

However, the delay arrival determination process is performed from the second user frame after connection setting, and the delay arrival determination reference value at this time is “arrival time of first user frame after connection setting + TTI”.

In addition, the late arrival judgment reference value changing means 910 includes:
The number of delays is counted for each connection, and when delays equal to or greater than the number of delay detection protection stages are detected, the delay determination reference value of the next user frame is set to “the delay determination reference value of the previous user frame + TTI + slide time”. (Fixed value determined by the system) "and reset the number of late arrivals of the connection to zero.

The upstream signal processing means 903 performs protocol conversion, speed conversion processing, and the like on the user frame input from the upstream cell disassembly means 902 for matching with the fixed network 605 of the communication destination, and assembles the upstream cells. Means 904
Output to

The upstream cell assembling means 904 assembles the user frame cells, and outputs the fixed network side transmission path I / F means 905.
To the fixed network 605 via the transmission path 607.

Next, from the fixed network 605, the mobile station device 601
A method of transmitting data in the side direction (downward direction) will be described.

When the signal processor 608 receives a cell from the fixed network 605 via the fixed network side transmission line I / F unit 905, the downlink cell disassembly unit 906 restores the user frame and outputs it to the downlink signal processing unit 907. I do.

Downlink signal processing means 907 performs codec processing for matching with the mobile station apparatus side protocol, and outputs the result to downlink cell assembling means 908. The downlink cell assembling means 908 converts the received frame into cells, and sends out the cells to the transmission path 606 via the base station controller-side transmission path I / F means 901.

When the base station control device 604 receives a cell from the transmission line 606 by the signal processing device side transmission line I / F unit 805, the downlink cell disassembly unit 806 restores the user frame from the received cell and duplicates the frame. Output to means 807.

Frame copying means 807 copies user frames to the number of base station apparatuses 602-1 to 602-n which transmit data, and outputs the copied user frames to downlink cell assembling means 808. Downlink cell assembling means 808 assembles the copied user frame into cells again, and transmits the base station side transmission path I /
The data is transmitted to the transmission paths 603-1 to 603-n via the F means 801.

The base station apparatuses 602-1 to 602-n connect the transmission line I / F means 10 to the transmission lines 603-1 to 603-n.
When the cell is received at 06, the user frame is restored by the cell decomposing means 1007 and the baseband signal processing means 1007
Output to 4.

After the baseband signal processing means 1004 performs baseband spreading processing on the user frame,
The transmission / reception unit 1003 converts the transmission signal subjected to the baseband spreading process into a radio frequency signal and outputs the radio frequency signal to the transmission / reception amplification unit 1002.

The transmission / reception amplifying means 1002 amplifies the power of the radio frequency signal to a specified level.
At 01, the power-amplified radio frequency signal is transmitted by radio. The transmitted radio frequency signal is transmitted to the mobile station device 601.
Received at.

Next, a transmission delay control method of a data transfer channel will be described with reference to a sequence diagram shown in FIG.

Base station device 60 in mobile communication system
A transmission delay control method for a data transfer channel between 2-1 to 602-n and the base station controller 604 is disclosed in Japanese Patent No. 2766.
No. 226, 3GPP (3rd
Generation Partnership Project) 3G TS 25.4
02, a method described as Transport Channel Synchronization is known. Here is 3G
TS 25.402 Transport Channel Synchronizatio
This will be described using n as an example.

The base station control device 604 executes step 110
1, when the connection is set or when the mobile station device 60
If the base station device (for example, 602-1) to which data is transmitted / received changes due to the movement of No. 1, step 110
2, the downlink transmission delay control frame generation means 811
Then, a downlink transmission delay control frame is generated. The downlink transmission delay control frame is converted into cells by the downlink cell assembling means 808 and transmitted to the transmission path 603-n of the target base station apparatus 602-n via the transmission path I / F means 801 on the base station side.

The base station device 602-n performs step 110.
In step 3, when the frame restored by the cell disassembly means 1007 is a downlink transmission delay control frame, the base station transmission delay control processing means 1008 transmits the user data calculated in advance as a radio frequency signal to the base station apparatus 602.
A reception time at which the delay time within −n is minimized;
The difference from the reception time of the downlink transmission delay control frame is calculated.

In step 1104, an uplink transmission delay control frame to which the calculated value is added is generated.
Output to the cell assembling means 1005. However, the calculation formula is “reception time at which the delay time in the base station device 602-n becomes the minimum when transmitting the pre-calculated user data as a radio frequency signal” − “reception time of the downlink transmission delay control frame”. I do.

For example, when transmitting the pre-calculated user data as a radio frequency signal, the base station device 602-
n, the reception time at which the delay time is minimized,
100 ms, “Reception time of downlink transmission delay control frame”
Is 105 ms, the uplink transmission delay control frame includes:
-5 ms is given.

The cell assembling means 1005 converts the upstream transmission delay control frame into cells, and
6 to the transmission path 603-n.

The base station control device 604 executes step 110
5, when the frame restored by the uplink cell disassembly unit 802 is an uplink transmission delay control frame, the uplink transmission delay control frame processing unit 810 converts the value given to the received frame into the base station side data transmission timing control unit 8.
12 is notified.

In step 1106, the base station side data transmission timing control means 8
By controlling the base station side transmission path I / F means 801 at 12, the data transmission timing to the base station apparatus 602-n is changed.

For example, when the value of the uplink transmission delay control frame is −5 ms, the data transmission timing to the base station device 602-n is advanced by 5 ms.

On the other hand, the signal processing device 608 increases the transmission delay due to the change in the base station device 602 -n with which the communication is performed, and the arrival timing of the user frame to the signal processing device 608 is different from the reference before the base station device change. In the case where the delay is fixedly delayed, in step 1107, the late arrival determination means 909 detects the delay of the user frame by the number of the late arrival detection protection steps, and in step 1108, sets the delay arrival determination reference value of the next user frame to User frame late arrival determination reference value + TTI + slide time (fixed value determined by the system) ". By continuing this processing until the delay arrives, the transmission delay control is completed.

As described above, in the conventional mobile communication system, the transmission delay control method between the base station devices 602-1 to 602-n and the base station control device 604 uses 3GPP.
PTS 25.402 Transport Channel Synchronisat
By using the method defined in the ion, it is possible to reduce the delay time of signal processing in the base station devices 602-1 to 602-n when transmitting user data as a radio frequency signal.

Further, in the signal processing device 608, the base station devices 602-1 to 602-
When n changes, the transmission delay increases, and the user frame arrival timing at the signal processing device 608 is fixedly delayed with respect to the reference of the late arrival determination before the base station device 602-1 to 602-n is changed. In this case, it is possible to detect the late arrival of the user frame more than the number of stages of the late arrival detection protection and change the time used as the criterion of the delay arrival so that the subsequent user frames are not determined to be late arrival. become.

[0066]

However, in the conventional device, transmission delay control in the signal processing device 608 is performed when a user frame having a TTI cycle arrives. For this reason, when compared with the transmission delay control completion timing between the base station devices 602-1 to 602-n and the base station control device 604, which is performed simultaneously with the change of the base station device to be transmitted / received (change of the transmission delay time). , Even if the increase in the transmission delay time is less than the slide time,
TI × the number of delay detection protection stages) + the increase in transmission delay time.

Further, since the slide time used for updating the criterion for delay arrival is a fixed value, it is not possible to change the criterion according to the transmission state at that time. Therefore, if the increase in the transmission delay is longer than the slide time, it is necessary to change the delay arrival determination reference a plurality of times, and there is a problem that it takes a longer time to complete the transmission delay control.

For example, when the transmission delay increased by the change of the base station devices 602-1 to 602-n to be transmitted and received is 20 ms, the slide time is 2 ms, and the number of delay detection protection stages is 1, the delay is 10 times. Since the destination reference value needs to be changed, a time of TTI × 10 ms is required until the transmission delay control is completed.

That is, in the conventional mobile communication system, the base station device 602-1 to which data is transmitted and received during communication is provided.
If the transmission delay increases due to the change of ６０602-n, there is a problem that the communication quality is deteriorated due to the late dropping of the user frame.

The present invention has been made in view of the above point, and it is possible to reduce the delay of discarded user frames by completing the transmission delay control from the base station controller to the signal processor in a short time. An object of the present invention is to provide a transmission delay control device in a mobile communication system and a transmission delay control method in a mobile communication system, which can prevent deterioration of communication quality.

[0071]

According to the present invention, there is provided a transmission delay control apparatus in a mobile communication system, comprising: transmitting a downlink transmission to a destination base station apparatus when a target base station apparatus for data transmission / reception is changed; First frame generating means for generating a delay control frame signal; receiving an uplink transmission delay control frame signal transmitted from the base station apparatus after receiving the downlink transmission delay control frame signal; setting the uplink transmission delay control frame signal A frame processing unit that outputs a value and an instruction to generate an uplink transmission delay control frame signal; a timing control unit that controls data transmission timing to the base station apparatus based on the set value; And a second frame generating means for generating an uplink transmission delay control frame signal to be transmitted to the communication network side.

According to this configuration, the transmission delay control frame signal can be transmitted to the signal processing device when the transmission delay control between the base station control device and the base station device is performed. Transmission delay control is completed in a shorter time as compared with the conventional mobile communication system, and it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

A base station controller according to the present invention comprises: a transmission delay controller in a mobile communication system having the above configuration; an uplink cell decomposer for restoring each frame signal from cells received from a plurality of base stations; Frame selecting means for selecting one of the selected frame signals, uplink cell assembling means for assembling the selected frame signal into cells, and downlink cell decomposing means for restoring a frame signal from a cell received from the signal processing device. And a frame duplicating means for duplicating the restored frame signal so as to be transmitted to a plurality of base station devices, and a downlink cell assembling means for assembling the duplicated frame signals into cells.

According to this configuration, the same operation and effect as described above can be obtained in the base station controller.

The signal processing apparatus of the present invention restores a frame signal from a received cell, and, when the restored frame signal is an uplink transmission delay control frame signal from the base station controller having the above-described configuration, performs the uplink transmission delay control. Uplink cell decomposing means for outputting a frame signal, transmission delay control processing means for determining a time for changing a delay determination reference value from a set value of the uplink transmission delay control frame signal, and according to the determined time A delay arrival determination reference value changing means for changing the delay arrival determination reference value, and detecting a delay of a received frame signal in the uplink cell disassembly means according to the changed delay arrival determination reference value, and complementing data. An output delay determining unit, and an upstream unit that performs a protocol conversion and a speed conversion process for matching the received frame signal with a communication network of a transmission destination according to the complementary data. No. processing means and a signal processing apparatus characterized by comprising an uplink cell assembly means, the assembling the data after the protocol conversion and speed conversion process in the cell.

According to this configuration, it is possible to perform transmission delay control processing in accordance with the contents of the transmission delay control frame from the base station controller, and to perform transmission delay control from the base station controller to the signal processing device in the conventional manner. Compared with the conventional mobile communication system, it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

The signal processing apparatus of the present invention, in the above-described configuration, matches downlink cell decomposition means for restoring a frame signal from a cell received from a communication network with a mobile station apparatus for the restored frame signal. Signal processing means for performing codec processing for decoding, and downlink cell assembling means for assembling data after the codec processing into cells.

According to this configuration, even when the signal processing device has a function of processing a downlink cell, the same operation and effect as described above can be obtained.

The base station apparatus of the present invention restores a frame signal from a received cell, and when the restored frame signal is a downlink transmission delay control frame signal from the base station controller having the above-described configuration, the downlink transmission delay control frame A cell disassembly unit that outputs a signal, and a time difference between a reception time when a delay time in the own apparatus is minimized and a reception time of the downlink transmission delay control frame signal when transmitting previously determined user data as a radio frequency signal. And a transmission delay control processing means for generating an uplink transmission delay control frame signal to which the calculated value is added, and a cell assembling means for assembling the uplink transmission delay control frame signal into cells.

According to this configuration, it is possible to receive the downlink transmission delay control frame from the base station controller and transmit the uplink control frame to the base station controller. Transmission delay control can be completed in a shorter time as compared with the conventional mobile communication system, and it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

A transmission delay control method in a mobile communication system according to the present invention is characterized in that when a base station apparatus to which data is transmitted / received is changed in a base station control apparatus, downlink transmission delay control is performed to a destination base station apparatus. Transmit the frame signal,
By receiving the uplink transmission delay control frame signal transmitted from the base station device after receiving the frame signal,
Along with outputting the set value of the uplink transmission delay control frame signal, outputting a generation instruction of the uplink transmission delay control frame signal, controlling data transmission timing to the base station apparatus based on the set value, responding to the generation instruction Thus, an upstream transmission delay control frame signal to be transmitted to the communication network side is generated.

According to this method, the transmission delay control frame signal can be transmitted to the signal processing device when the transmission delay control between the base station control device and the base station device is performed. Transmission delay control is completed in a shorter time as compared with the conventional mobile communication system, and it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

According to the transmission delay control method in the mobile communication system of the present invention, in the above-mentioned method, the signal processing device connected between the base station control device and the communication network uses a cell received from a plurality of base station devices. Restore each frame signal,
When the restored frame signal is an uplink transmission delay control frame signal, a time for changing a delay determination reference value from a set value of the uplink transmission delay control frame signal is determined, and according to the determined time, Change the delay arrival determination reference value, detect delay of reception frame signals from the plurality of base station apparatuses according to the changed delay arrival determination reference value, and output complementary data. Then, protocol conversion and speed conversion processing for matching the received frame signal with the communication network of the transmission destination are performed, and the data after the protocol conversion and speed conversion processing are assembled into cells.

According to this method, it is possible to carry out transmission delay control processing according to the contents of the transmission delay control frame from the base station controller, and to perform transmission delay control from the base station controller to the signal processor in the conventional manner. Compared with the conventional mobile communication system, it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

In the transmission delay control method for a mobile communication system according to the present invention, in the above method, the base station apparatus restores a frame signal from a received cell, and the restored frame signal is used for downlink transmission delay control from the base station control apparatus. In the case of a frame signal, a time difference between a reception time at which the delay time is minimized in the base station apparatus and a reception time of the downlink transmission delay control frame signal when the user data determined in advance is transmitted as a radio frequency signal is calculated. Then, an uplink transmission delay control frame signal to which the calculated value is added is generated, and the generated uplink transmission delay control frame signal is assembled in a cell.

According to this method, it is possible to receive the downlink transmission delay control frame from the base station controller and transmit the uplink control frame to the base station controller. Transmission delay control can be completed in a shorter time as compared with the conventional mobile communication system, and it is possible to reduce delay in discarding user frames and prevent deterioration of communication quality.

[0087]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a mobile communication system according to one embodiment of the present invention.

The mobile communication system shown in FIG. 1 includes a mobile station device 101 in a communication area, a plurality of base station devices 102-1 to 102-n that perform radio communication with the mobile station device, and a base station device 102 -1 to 102-n through the wired transmission line 10
3-1 to 103-n, a base station controller 104 that performs overall control, and the base station controller 104 and the fixed network 105.
And a signal processing device 108 for performing signal conversion processing on user data such as audio data and image data based on codec / decoding and a protocol conversion algorithm. I have.

Each of the devices 102-1 to 102-n, 104,
Signal transmission between 108 and 105 is A
It is transmitted in the form of an ATM cell assembled according to the processing procedure specified in AL Type 2.

FIG. 2 is a block diagram showing a configuration of base station controller 104 in the mobile communication system according to the present embodiment shown in FIG.

The base station controller 104 shown in FIG.
Base station side transmission path I / F means 201, uplink cell disassembly means 202, frame selection means 203, uplink cell assembling means 204, signal processing apparatus side transmission path I / F means 205
, Downlink cell decomposing means 206 and frame duplicating means 20
7, a downlink cell assembling means 208, and a base station controller transmission delay control processing means 209.

The base station controller transmission delay control processing means 209 includes an upstream transmission delay control frame processing means 210.
, A downlink transmission delay control frame generation unit 211, a base station side data transmission timing control unit 212, and a transmission delay control frame generation unit 213 between signal processing devices.

The transmission line I / F means 201 on the base station side communicates with the base station devices 102-1 to 102-n and the transmission lines 103-1 to 103-1.
Cell transmission / reception is performed via 03-n. The uplink cell disassembly means 202 includes a base station transmission path I / F means 201
The user frame is restored from the cell received via the.

The frame selection means 203 selects a desired frame from the restored frames of the base station devices 102-1 to 102-n based on a frame selection algorithm. However, the algorithm used to select the frame is not specified.

The up cell assembling means 204 assembles the selected frame into cells again. The signal processing device side transmission path I / F means 205 transmits and receives cells to and from the signal processing device 108 via the transmission path 106.

Downlink cell disassembly means 206
A user frame is restored from a cell received by the signal processing device side transmission path I / F means 205 from the signal processing device 108 via the communication device. The frame duplicating means 207 duplicates the restored frame. The downlink cell assembling means 208 is for assembling each of the copied frames into cells again.

Base station controller transmission delay control processing means 20
9 performs transmission delay control processing of a data transfer channel between each of the base station devices 102-1 to 102-n and the base station control device 104.

Upstream transmission delay control frame processing means 210
When the frame restored by the uplink cell disassembly unit 202 is an uplink transmission delay control frame, the set value of this frame is notified to the data transmission timing control unit 212 on the base station side. This is for instructing the inter-processing device transmission delay control frame generation means 213 to generate a transmission delay control frame between signal processing devices.

Downlink transmission delay control frame generation means 211
Is a base station device (for example, 1
02-1) is changed, the downlink cell assembling means 20
8, a transmission delay control frame is generated.

Base station side data transmission timing control means 2
12, when the frame restored by the uplink cell disassembly unit 202 is an uplink transmission delay control frame, based on the setting value of the frame notified from the uplink transmission delay control frame processing unit 210, the base station side transmission path I / By controlling the F means 201, the base station apparatuses 102-1 to 102-2
-N to change the data transmission timing.

The transmission delay control frame generation means 213 between the signal processing devices
In response to an instruction from 0, a transmission delay control frame between the signal processing devices 608 is generated and output to the upstream cell assembling means 204.

FIG. 3 is a block diagram showing a configuration of signal processing device 108 in the mobile communication system according to the present embodiment shown in FIG.

The signal processor 108 shown in FIG. 3 includes a base station controller side transmission path I / F unit 301, an uplink cell disassembly unit 302, an uplink signal processing unit 303, an uplink cell assembling unit 304, and a fixed Network side transmission path I / F means 305
, Downlink cell decomposing means 306, and downlink signal processing means 30
7, the downstream cell assembling means 308, and the late arrival determining means 30
9, a delay arrival criterion value changing means 310, and a signal processing device transmission delay control processing means 311.

Base station controller side transmission path I / F means 301
Transmits / receives cells to / from the base station controller 104 via the transmission path 106.

The uplink cell disassembly means 302 restores the transmission delay control frame from the base station control device 103 from the cell received via the base station control device side transmission path I / F means 301, and converts the restored frame. The signal is output to the signal processing device transmission delay control processing means 311.

Signal processing device transmission delay control processing means 311
Is determined by referring to the transmission delay control frame to determine a slide time for changing the delay arrival determination reference value, and notifying the determined slide time to the delay arrival determination reference value changing unit 310, This is an instruction to change the judgment reference value.

The late arrival judgment reference value changing means 310 changes the late arrival judgment reference value according to the instruction.

The late arrival determination means 309 determines the late arrival of the user frame according to the delay arrival determination reference value, and outputs complementary data to the upstream signal processing means 303.

The upstream signal processing means 303 performs protocol conversion, speed conversion processing, and the like for matching the user frame input from the upstream cell disassembly means 302 with the fixed network 105 of the communication destination.

The upstream cell assembling means 304 is for assembling data input from the upstream signal processing means 303 into cells.

The fixed network side transmission path I / F means 305 transmits and receives cells via the fixed network 105 and the transmission path 107.

The downlink cell disassembly means 306 restores a frame from a cell received via the fixed network side transmission path I / F means 305.

[0114] The downlink signal processing means 307 performs codec decoding for matching the user frame input from the downlink cell decomposing means 306 with the mobile station apparatus 101.

The downlink cell assembling means 308 is for assembling data input from the downlink signal processing means 307 into cells.

FIG. 4 shows base station apparatuses 102-1 to 102-1 in the mobile communication system according to the present embodiment shown in FIG.
It is a block diagram which shows the structure of 02-n.

Base station apparatuses 102-1 to 102-2 shown in FIG.
-N is an antenna means 401 for transmitting / receiving wireless data to / from the mobile station apparatus 101, a transmission / reception amplification means 402,
Wireless transmission / reception means 403 and baseband signal processing means 4
04, cell assembling means 405, and transmission path I / F means 40
6, a cell disassembly means 407, and a base station transmission delay control processing means 408.

The transmission / reception amplifying means 402 includes the antenna means 4
01 amplifies the data transmitted and received.

The wireless transmitting / receiving means 403 converts the received data into A
/ D conversion and D / A conversion of transmission data.

The baseband signal processing means 404 performs error correction coding, framing, data modulation, and spread modulation of transmission data, as well as despread reception data, chip synchronization, error correction coding, data demultiplexing, and the like. Is what you do.

The cell assembling means 405 converts the received data into cells.

The transmission line I / F means 406 transmits and receives cells to and from the base station controller 104 via the transmission lines 103-1 to 103-n.

The cell decomposing means 407 decomposes the cells received by the transmission line I / F means 406 and restores the frame.

The base station transmission delay control processing means 408 outputs an upstream transmission delay control frame to the cell assembling means 405 when receiving a downstream transmission delay control frame.

Next, a method of controlling a transmission delay of a data transfer channel in a mobile communication system according to the present invention will be described with reference to a sequence diagram shown in FIG.

In step 501 shown in FIG. 5, the base station control apparatus 104 changes the base station apparatus (for example, 102-1) to which data is to be transmitted / received when a connection is set or when the mobile station apparatus 101 moves. In this case, in step 502, the downlink transmission delay control frame generation means 211 generates a downlink transmission delay control frame. This downlink transmission delay control frame is transmitted to the downlink cell assembling means 20.
The cell is converted into a cell at step 8 and transmitted to the transmission path 103-n of the target base station apparatus 102-n via the transmission path I / F means 201.

The base station apparatus 102-n performs step 503.
In the case where the frame reconstructed by the cell disassembly means 407 is a downlink transmission delay control frame, when the base station transmission delay control processing means 408 sends user data calculated in advance as a radio frequency signal, the base station apparatus 102- The difference between the reception time at which the delay time within n is minimized and the reception time of the downlink transmission delay control frame is calculated.

Then, in step 504, an uplink transmission delay control frame to which the calculated value is added is generated and output to the cell assembling means 405. However, the calculation formula is “reception time when the delay time in the base station device 102-n becomes the smallest when transmitting the pre-calculated user data as a radio frequency signal” − “reception time of the downlink transmission delay control frame”. I do.

For example, when transmitting the previously calculated user data as a radio frequency signal, the base station 102-
n, the reception time at which the delay time is minimized,
100 ms, “Reception time of downlink transmission delay control frame”
Is 105 ms, the uplink transmission delay control frame includes:
-5 ms is given.

The cell assembling means 405 converts the upstream transmission delay control frame into cells, and sends the cells to the transmission path 103-n via the transmission path I / F means 406.

The base station control device 104 executes step 505.
In the case where the frame restored by the uplink cell disassembly means 202 is an uplink transmission delay control frame, the uplink transmission delay control frame processing means 210 converts the value given to the received frame into the base station side data transmission timing control means 21.
Notify 2.

Then, in step 506, based on the notification, the base station-side data transmission timing control means 21
The data transmission timing to the base station device 102-n is changed by controlling the base station side transmission path I / F means 201 in 2.

For example, when the value of the uplink transmission delay control frame is -5 ms, the data transmission timing to the base station device 102-n is advanced by 5 ms.

Next, in step 507, if the frame reconstructed by the uplink cell decomposing means 202 is an uplink transmission delay control frame, the base station control apparatus 104 In response to the instruction to generate the transmission delay control frame during the transmission, the transmission delay control frame generation unit 213 between the signal processing devices generates a transmission delay control frame to the signal processing device 108 and outputs the frame to the upstream cell assembling unit 204. However, the transmission delay control frame is provided with the value given by the upstream transmission delay control frame processing means 210 to the upstream transmission delay control frame received in step 505.

The upstream cell assembling means 204 converts the transmission delay control frame into a cell, and converts the transmission delay control frame into a cell.
The data is transmitted to the transmission path 106 via the F means 205.

Next, the signal processing device 108 executes step 5
In 08, when the transmission delay control frame is received by the uplink cell decomposing means 302 via the I / F means 301, the received transmission delay control frame is output to the signal processing device transmission delay control processing means 311.

Signal processing device transmission delay control processing means 311
Is the base station controller 104 in the transmission delay control frame.
The slide time for changing the late arrival determination reference value is determined as “the reference value × (−1)” with reference to the value given by the frame generation means 213 of FIG. For example, when the referenced value is -5 ms, the slide time is 5 ms.

After determining the slide time, the processing means 311 notifies the delay time determination reference value changing means 310 of the slide time and instructs the delay time determination reference value to be changed.

In step 509, the delay determination reference value changing means 310 changes the delay determination reference value of the next user frame to “the delay arrival reference value of the next user frame + the notified slide time” in response to the instruction. To "."

Here, the time difference between the transmission delay control completion timing between the base station device 102-n and the base station control device 104 and the transmission delay control completion timing between the base station control device 104 and the signal processing device 108 is calculated as follows. An example and an example of the present embodiment will be compared.

The precondition is that the transmission delay increased by the change of the base station apparatus 102-n for data transmission / reception is 1
0 ms, slide time 2 m pre-defined in the conventional example
s, the number of delay detection protection stages is 1, and the TTI is 40 ms.

The time difference between the transmission delay control completion timing between the base station device 102-n and the base station control device 104 and the transmission delay control completion timing between the base station control device 104 and the signal processing device 108 in the conventional example is TTI. (40
ms) × 5 ms = 200 ms.

On the other hand, base station apparatus 1 according to the present embodiment
02-n and the transmission delay control completion timing between the base station controller 104 and the base station controller 104 and the signal processor 1
08, the transmission delay control frame generation time in the base station control device 104, the transmission time of the transmission delay control frame from the base station control device 104 to the signal processing device 108, the signal processing device 10
8 is obtained as the sum of the three transmission delay control processing times. This depends on the execution speed of the CPU performing the processing and the speed of the transmission path, but can be assumed to be completed within a few ms.

As described above, according to the transmission delay control device in the mobile communication system of the present embodiment, first, a transmission delay control frame is defined between base station control device 104 and signal processing device 108. The base station control device 104 sends a transmission delay control frame to the signal processing device 108 when performing transmission delay control with the base station device (any of 102-1 to 102-n). In the signal processing device 108 that has received the transmission delay control frame, the time used as the criterion for determining the delay is changed according to the content of the transmission delay control frame.

As a result, the transmission delay control from the base station control device 104 to the signal processing device 108 can be completed in a shorter time as compared with the conventional mobile communication system, so that the late discarding of user frames is reduced. It is possible,
This can prevent deterioration of communication quality.
In the present embodiment, AAL Type 2 is used for data transmission.
Has been described, but the same effect can be obtained by applying other protocols.

[0146]

As described above, according to the present invention,
By completing the transmission delay control from the base station control device to the signal processing device in a short period of time, it is possible to reduce late discarding of user frames, thereby preventing deterioration of communication quality.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station control device in the mobile communication system according to the embodiment.

FIG. 3 is a block diagram showing a configuration of a signal processing device in the mobile communication system according to the embodiment.

FIG. 4 is a block diagram showing a configuration of a base station device in the mobile communication system according to the embodiment.

FIG. 5 is a sequence diagram for explaining an operation of transmission delay control in the mobile communication system according to the embodiment.

FIG. 6 is a block diagram showing a configuration of a conventional mobile communication system.

FIG. 7 is a diagram showing a frame format until an ATM cell is assembled from a frame.

FIG. 8 is a block diagram showing a configuration of a base station control device in a conventional mobile communication system.

FIG. 9 is a block diagram showing a configuration of a signal processing device in a conventional mobile communication system.

FIG. 10 is a block diagram showing a configuration of a base station device in a conventional mobile communication system.

FIG. 11 is a sequence diagram for explaining an operation of transmission delay control in a conventional mobile communication system.

[Explanation of symbols]

 Reference Signs List 101 mobile station device 102-1 to 102-n base station device 104 base station control device 105 fixed network 108 signal processing device 202, 302 uplink cell disassembly unit 203 frame selection unit 204 uplink cell assembling unit 206, 306 downlink cell disassembly unit 207 Frame duplication unit 208 Downlink cell assembling unit 209 Base station controller transmission delay control processing unit 210 Uplink transmission delay control frame processing unit 211 Downlink transmission delay control frame generation unit 212 Base station side data transmission timing control unit 213 Transmission delay between signal processing units Control frame generating means 303 Uplink signal processing means 304 Uplink cell assembling means 307 Downlink signal processing means 308 Downstream cell assembling means 405 Cell assembling means 407 Cell decomposing means 408 Base station transmission delay control processing means

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[Procedure amendment]

[Submission date] December 11, 2000 (200.12.
11)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

Claims (8)

[Claims] A first frame generating means for generating a downlink transmission delay control frame signal to be transmitted to a destination base station apparatus when a base station apparatus to be transmitted / received is changed; Receives an uplink transmission delay control frame signal transmitted from the base station apparatus after receiving the control frame signal, outputs a set value of the uplink transmission delay control frame signal, and outputs an instruction to generate an uplink transmission delay control frame signal. Frame processing means, timing control means for controlling data transmission timing to the base station apparatus based on the set value, and second frame for generating an uplink transmission delay control frame signal to be transmitted to the communication network side in response to the generation instruction A transmission delay control apparatus in a mobile communication system, comprising: a generation unit. 2. A transmission delay control device in a mobile communication system according to claim 1, an uplink cell decomposing means for restoring each frame signal from cells received from a plurality of base station devices, and said restored frame signal. Frame selecting means for selecting one of the above, an uplink cell assembling means for assembling the selected frame signal into a cell, a downlink cell decomposing means for restoring a frame signal from a cell received from a signal processing device, Frame duplication means for duplicating the transmitted frame signal so as to be transmitted to a plurality of base station apparatuses,
A base station control device, comprising: a down cell assembling unit that assembles the copied frame signals into cells. 3. A frame signal is recovered from a received cell, and when the recovered frame signal is an uplink transmission delay control frame signal from the base station controller according to claim 2, the uplink transmission delay control frame signal is output. Uplink cell disassembly means, transmission delay control processing means for determining a time for changing a delay determination reference value from a set value of the uplink transmission delay control frame signal, and delay determination according to the determined time. A delay arrival criterion value changing means for changing a reference value, and detecting a delay of the received frame signal in the uplink cell decomposing means in accordance with the changed delay arrival criterion value, and complementing data (Omura: Is the interpolation data an error in the interpolation data, and describe the role of the interpolation data, for example, how the upstream signal processing means uses the interpolation data. And delay conversion means for outputting the output signal, and protocol conversion and speed conversion processing for matching the received frame signal with the communication network of the transmission destination according to the complementary data. A signal processing device comprising: an upstream signal processing unit that performs the above-mentioned processing; and an upstream cell assembling unit that assembles the data after the protocol conversion and the speed conversion processing into cells. 4. A downlink cell decomposing means for restoring a frame signal from a cell received from a communication network, and a downlink signal processing for performing codec processing for matching the restored frame signal with a mobile station apparatus. 4. The signal processing apparatus according to claim 3, further comprising: a downstream cell assembling unit for assembling the data after the codec processing into cells. 5. A frame signal is reconstructed from a received cell, and when the reconstructed frame signal is a downlink transmission delay control frame signal from the base station controller according to claim 2, the downlink transmission delay control frame signal is output. Cell disassembly means;
When transmitting the user data obtained in advance as a radio frequency signal, calculate the time difference between the reception time at which the delay time in the own device is minimized and the reception time of the downlink transmission delay control frame signal, and assign this calculated value. A base station apparatus comprising: a transmission delay control processing unit that generates the uplink transmission delay control frame signal described above; and a cell assembling unit that assembles the uplink transmission delay control frame signal into cells. 6. The base station controller transmits a downlink transmission delay control frame signal to a destination base station apparatus when a base station apparatus to which data is to be transmitted / received is changed. By receiving the uplink transmission delay control frame signal transmitted from the base station apparatus, the set value of the uplink transmission delay control frame signal is output, and the generation instruction of the uplink transmission delay control frame signal is output, and the set value is output. A transmission delay control method in a mobile communication system, comprising: controlling a data transmission timing to a base station apparatus based on the transmission instruction, and generating an uplink transmission delay control frame signal to be transmitted to a communication network side in response to the generation instruction. 7. A signal processing device connected between a base station controller and a communication network restores each frame signal from cells received from a plurality of base station devices, and the restored frame signal is used for uplink transmission delay control. If it is a frame signal,
A time for changing the delay arrival determination reference value is determined from the set value of the uplink transmission delay control frame signal, and the delay arrival determination reference value is changed according to the determined time, and the changed delay arrival determination is performed. Detecting delay of received frame signals from the plurality of base station apparatuses according to a reference value, outputting complementary data, and matching the received frame signal with a communication network of a transmission destination for the received frame signal according to the complementary data. 7. A transmission delay control method in a mobile communication system according to claim 6, further comprising: performing protocol conversion and speed conversion processing for assembling the data, and assembling the data after the protocol conversion and speed conversion processing into cells. 8. The base station apparatus restores a frame signal from a received cell. If the restored frame signal is a downlink transmission delay control frame signal from a base station control apparatus, user data obtained in advance is used as a radio frequency signal. When transmitting, calculate the time difference between the reception time at which the delay time in the base station apparatus becomes the minimum and the reception time of the downlink transmission delay control frame signal, and generate an uplink transmission delay control frame signal to which the calculated value is added. 7. The transmission delay control method in a mobile communication system according to claim 6, wherein the generated uplink transmission delay control frame signal is assembled in a cell.