WO2006006208A1 - 無線基地局 - Google Patents
無線基地局 Download PDFInfo
- Publication number
- WO2006006208A1 WO2006006208A1 PCT/JP2004/009734 JP2004009734W WO2006006208A1 WO 2006006208 A1 WO2006006208 A1 WO 2006006208A1 JP 2004009734 W JP2004009734 W JP 2004009734W WO 2006006208 A1 WO2006006208 A1 WO 2006006208A1
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- WIPO (PCT)
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- data
- reception rate
- data reception
- rate
- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/12—Flow control between communication endpoints using signalling between network elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/385—Contact thermal transfer or sublimation processes characterised by the transferable dyes or pigments
- B41M5/3854—Dyes containing one or more acyclic carbon-to-carbon double bonds, e.g., di- or tri-cyanovinyl, methine
Definitions
- the present invention relates to a radio base station constituting a mobile communication system, and more particularly to a radio base station capable of realizing high throughput by performing flow control on data received from a host device. It is.
- a target transmission capacity of a wired line is obtained based on the effective transmission rate of the radio line, and a transmission capacity request signal for requesting the relay station to increase or decrease the allowable transmission capacity is obtained using that target.
- the target transmission capacity is calculated by calculating the difference between the effective transmission speed of the wireless line and the effective transmission speed of the wired line. For example, if the difference exceeds a predetermined threshold # 1, the transmission capacity is calculated as RQ. It is increased by # 1, and is decreased by RQ # 2 when the difference falls below a predetermined threshold value # 2 (see Patent Document 1 below).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-358763 FIG. 2, FIG.
- the effective transmission rate of a wireless line is the effective transmission rate of a wired line (ie In this case, the call data does not remain at all in the base station.
- HSDPA High Speed Downlink Packet Access
- the wireless base station has a data transmission scheduling function such as (Speed Downlink Packet Access)
- the number of data that can be transmitted to each terminal at one time is for each terminal that is staying in the wireless base station. Since the number of data is limited to the upper limit and scheduling is performed with the upper limit limited, efficient scheduling cannot be performed, and There was a problem that the throughput of the whole stem was lowered.
- transmission data stays in a host device of a radio base station, but data for a terminal with a good radio channel state does not exist in the radio base station, and is intended for a terminal with a bad radio channel state.
- a situation occurs in which only data exists in the radio base station. For this reason, radio resources must be allocated to terminals with poor radio link conditions, and the overall system throughput decreases.
- the present invention has been made in view of the above, and an object of the present invention is to provide a radio base station capable of realizing the maximum throughput by effectively performing flow control. Means for solving the problem
- the radio base station provides scheduling for controlling the data transmission rate to the radio channel according to the radio channel status of the terminal.
- a wireless base station having a function, for example, data holding means for holding received data from a host device in a buffer, output amount monitoring means for monitoring the amount of data transmitted from the buffer,
- a retention amount management means for performing processing (flow control) for determining a reception rate (data reception rate) of data sent from a host device so that the data retention amount is maintained within a certain range;
- Reception rate notifying means for notifying the host device of the reception rate.
- the staying amount management means compares the data transmission rate obtained by monitoring the output amount monitoring means with the data reception rate that has been notified to the host device, and We decided to perform flow control based on the results.
- the staying amount management means is configured to monitor the data transmission rate obtained by the output amount monitoring means. Compare the data reception rate notified to the higher-level device and based on the result Since the flow control is performed, the maximum throughput can be realized.
- FIG. 1 is a diagram showing a configuration example of a radio base station according to the present invention.
- FIG. 2 is a diagram showing the operation of the staying amount management unit 5.
- FIG. 3 is a diagram showing a data reception rate determination method using data reception rate increase control and data reception rate decrease control.
- FIG. 4 is a diagram showing a data retention number target value table.
- FIG. 5 is a diagram showing an example of data reception rate increase control.
- FIG. 6 is a diagram showing an example of data reception rate reduction control.
- FIG. 7 is a diagram illustrating an operation of a reception rate notification unit.
- FIG. 1 is a diagram illustrating a configuration example of a radio base station according to the present invention.
- the radio base station 1 according to the present embodiment has a data holding unit 2 that holds received data, and this data holding unit 2 includes a plurality of queues 3 (3-1, 3-2,..., 3-m. ).
- the wireless base station 1 (1) Output amount monitoring unit 4 that counts the number of data to be output from 3 for each queue, and the data reception rate by periodically referring to the data retention count for each queue 3 and the output data number counted by the output amount monitoring unit 4 Stagnation amount management unit 5 for calculating the reception rate, the reception rate notification unit 6 for notifying the host device 11 of the data reception rate calculated by the stagnation amount management unit 5 via the data transmission / reception unit 10, and the stagnation amount management unit 5 and a call control unit 8 for notifying the start and completion of the handover of the terminal. Furthermore, the scheduler unit 7 schedules data transmission according to the state of the radio channel of the terminal, extracts data from the queue 3 and outputs it to the radio channel.
- the data transmitted from the host device 11 is received by the data transmitting / receiving unit 10 of the radio base station 1 and is classified and held in each queue 3 in the data holding unit 2 for each communication unit.
- the scheduler unit 7 performs scheduling in consideration of the radio channel state, data priority, fairness, etc. for each terminal, and transmits the data to the radio channel.
- the output amount monitoring unit 4 increments a counter corresponding to each queue 3.
- the output of the output amount monitoring unit 4 and the scheduler unit 7 is described as independent.
- the increment of the counter may be performed by the scheduler unit 7.
- FIG. 2 is a diagram illustrating the operation of the staying amount management unit 5.
- the staying amount management unit 5 operates, for example, in a certain cycle by the timer 9 or a cycle according to the data reception capability of the terminal, and performs a data reception rate calculation process.
- the data reception capability of the terminal is equivalent to the maximum reception rate that the terminal can receive.
- the operation using one queue, for example, queue 3-1 will be described as an example.
- the retention amount management unit 5 refers to the counter of the output amount monitoring unit 4, and determines the number of data output from the queue 3-1 per unit time as the nth time.
- Data transmission rate Ro (n) is calculated (step SI).
- the data transmission rate Ro (n) may be calculated as an average value including past calculation results.
- the retention amount management unit 5 compares the data reception rate Ri (n—1) calculated previously with the data transmission rate Ro (n) (step S2), and Ro (n) is more If it is larger (Step S2, Yes), the data reception rate increase control (Step S3) described later is performed, and if Ro (n) is smaller (Step S2, No), the data reception rate decrease control ( Perform step S4).
- the data reception rate Ri (n ⁇ 1) is a value notified to the host device 11 at the time of the previous data reception rate calculation. The host device 11 performs data transmission at a rate lower than the notified data reception rate.
- the data reception rate is limited so as not to exceed the reception line bandwidth from the host device 11 (step S5). This makes it possible to avoid problems such as data loss and congestion that occur in lower layers than flow control.
- FIG. 3 is a diagram showing a data reception rate determination method using data reception rate increase control (step S3) and data reception rate decrease control (step S4).
- the horizontal axis shows whether data reception rate increase control or data reception rate decrease control is performed.
- the vertical axis indicates the number of data retention in queue 3-1.
- the retention amount management unit 5 refers to the data retention number in the queue 3-1 and sets the data retention number target. The data reception rate is determined so as to approach the value T.
- the data retention target value T is determined by, for example, the number of queues 3 (3-1-3m) allocated to the communication unit, and the number of calls connected to the radio base station 1. As the amount of data increases, the target number of data retention should be reduced dynamically. For example, if the total number of buffers held by the data holding unit 2 is A and the target is to hold data for that percentage K%, and if m queues are set, the data will be held per queue.
- the target number T is determined by the following equation (1).
- the total number of buffers A and the ratio K% are predetermined constants.
- the value of the force setting queue number m indicating the case where the data retention target number T is dynamically changed according to the value of the setting queue number m is set as a predetermined maximum value. It is also possible to leave. In this case, the data retention target number T is a predetermined constant.
- the retention amount management unit 5 prepares the data retention number target value table shown in FIG. 4 in advance ( (The lower the data reception target value, the lower the data reception target). Then, the data retention target value T is obtained using the maximum reception rate W as an index. Similarly, when using the latest data transmission rate Ro (n), prepare a data retention count target value table using Ro (n) as an index (decrease the data retention target value for terminals with lower data transmission rates). )
- the first threshold value B1 shown in FIG. 3 is a threshold value for determining whether the data reception rate is “increase” or “maintain current” in the data reception rate increase control (step S3).
- the value is smaller by the first control width HI with reference to the value T.
- the first control width HI may be a value that changes according to the value of the data retention number target value T, which may be a predetermined value.
- the data reception rate increase control the data reception rate is increased when the data retention count in the queue to be controlled falls below the first threshold value B1, and the data retention rate exceeds the first threshold value B1. If there is, control is performed to maintain the current data reception rate.
- FIG. 5 is a diagram illustrating an example of data reception rate increase control.
- L (n) is the number of data retention in the queue at the time when it is decided to perform data reception rate increase control (step S3)
- L (n) ⁇ BO ( In step SI1, Yes)
- the data reception rate Ri (n) is increased by the rate increase amount VI with respect to the previous data reception rate Ri (n-1) (step S12).
- BO is a value less than or equal to the first threshold value B1, and may be a value that changes dynamically as a value indicating the amount of instantaneous change in L (n) as a predetermined value.
- Rate increase amount VI may be a value that changes according to the value of data reception rate Ri, which may be a predetermined value.
- step S11 the number of data stays in the queue L (n) is compared with B0.
- a value obtained by averaging the data retention number in the data reception rate calculation cycle or the minimum value of the data retention rate within the data reception rate calculation cycle may be used.
- the retention amount management unit 5 compares the data retention amount L (n) with the first threshold value B1 (step S13). If L (n) ⁇ B1 (step SI 3, Yes), the data reception rate Ri (n) is maintained as it was last time (step S14). If L (n) ⁇ B1 (No at step S13), the data reception rate Ri (n) is increased by the rate increase amount V2 with respect to the data transmission rate Ro (n) (step S15).
- the rate increase V2 may be a value that changes according to the difference between the data reception rate Ri (n-1) and the data transmission rate Ro (n), which is also a predetermined value.
- step S3 when the data reception rate increase control is performed (step S3), the data smaller than the data retention number target value, the first threshold, and the value B1 are used. Implement data reception rate increase control. Thereby, the data retention amount in the queue can be brought close to the data retention number target value T efficiently.
- the second and third threshold values are used to determine whether the data reception rate is “0”, “decrease” or “maintain” in the data reception rate reduction control (step S4).
- Threshold The second threshold B2 is a value that is larger by the second control width H2 with respect to the data retention number target value T as a reference.
- the second control width H2 may be a value that changes according to the value of the data retention number target value T, which may be a predetermined value.
- the third threshold value B3 is the maximum value of the data retention amount assumed for one queue, and is a value determined based on a predetermined value or a terminal data reception capability.
- the maximum value is a value used to stop data transmission from the host device 11 and does not discard data received exceeding the third threshold B3. That is, as long as the buffer held by the data holding unit 2 does not run out, data reception is permitted even if the third threshold value B3 is exceeded.
- the current data reception rate is maintained when the number of data retention in the queue to be controlled falls below the second threshold B2, and the number of data retention is the first. If the second threshold B2 or more and less than the third threshold B3, the data reception rate If the data retention amount is greater than or equal to the third threshold value B3, the data reception rate is controlled to be “0”.
- the data reception rate 0 means that data transmission is stopped in the host device 11.
- FIG. 6 is a diagram illustrating an example of data reception rate reduction control.
- the retention amount management unit 5 next compares L (n) with the second threshold value B2 (step S23). ). If L (n) is B2 (step S23, Yes), the data reception rate Ri (n) is maintained as it was last time (step S24). If L (n) ⁇ B2 (step S23, No), the data reception rate Ri (n) is decreased by the rate decrease amount V3 with respect to the data transmission rate Ro (n) (step S25).
- the rate decrease amount V3 may be a value that changes according to the difference between the data reception rate Ri (n ⁇ 1) and the data transmission rate Ro (n), which may be a predetermined value. Further, the calculation result in step S25 is limited to a predetermined minimum value so as not to become smaller than the minimum value.
- step S3 when the data reception rate reduction control is performed (step S3), the data larger than the data retention number target value, the second threshold, the value B2 and the third threshold, Implement data reception rate reduction control based on value B3. As a result, data retention in the queue Can be effectively brought close to the target value T of data retention.
- the data reception rate Ri (n) determined by the retention amount management unit 5 is converted into a parameter that can be interpreted by the higher-level device 11 by the reception rate notification unit 6 (step S31).
- This parameter conversion is converted into two flow control parameters, Interval and Credits, when applied to HSDPA with different forces depending on the system to which the present invention is applied. These parameters mean that the upper device 11 is allowed to transmit data equal to or less than the number of credits during the interval.
- This parameter conversion may be performed by a calculation method using a table or by a calculation method.
- the reception rate notifying unit 6 determines whether or not it is necessary to notify the host device 11 of the data reception rate Ri (n), and performs suppression control of the data reception rate notification (step S3 2). .
- the reception rate notifying unit 6 determines whether or not it is necessary to notify the host device 11 of the data reception rate Ri (n), and performs suppression control of the data reception rate notification (step S3 2). .
- the determined data reception rate Ri (n) is equal to the previously determined data reception rate Ri (n-1).
- the call control unit 8 shown in FIG. 1 manages states such as call setup, call release, and handover of the terminal by transmitting and receiving call control information to and from the host device 11.
- Call controller 8 performs terminal handover
- the retention amount management unit 5 is notified of the status.
- the retention amount management unit 5 changes the data retention number target value T shown in FIG. 3 to a predetermined small value, and accordingly, the first threshold value, After resetting the second threshold value, the data reception rate Ri is recalculated according to the operation in Fig.2.
- the recalculated data reception rate is notified to the host device 11 by the reception rate notification unit 6.
- the data reception rate can be reduced during handover, and the amount of data transmitted by the host device 11 can be reduced.
- the stay amount management unit 5 resets the value of the data stay number target value T shown in FIG. 3 by the normal method described above, Accordingly, after resetting the first and second threshold values, the data reception rate Ri is recalculated according to the operation in Fig.2. The recalculated data reception rate is notified to the host device 11 by the reception rate notification unit 6. As a result, the data reception rate can be returned to the normal state after the handover is completed, and the amount of data transmitted by the host device 11 can be returned to the normal state.
- the value of the third threshold value B3 shown in FIG. 3 is set to “0”.
- the data reception rate Ri is set to “0” by immediately executing the data reception rate reduction control shown in FIG.
- the data reception rate is notified by the reception rate notification unit 6 to the higher-level device 11, and data transmission from the higher-level device 11 is stopped during the handover.
- the value of the third threshold value B3 shown in FIG. 3 is reset by a normal method, and the operation shown in FIG. 2 is executed. Recalculate the data reception rate Ri.
- the data reception rate is notified by the reception rate notifying unit 6 to the upper apparatus 11, and after the handover is completed, the data transmission from the upper apparatus 11 is resumed.
- the flow control is effectively performed to achieve the maximum. Limited throughput can be achieved.
- the radio base station according to the present invention is useful as a radio base station constituting a mobile communication system, and in particular, a radio base station that performs flow control on data received from a host device. Suitable for
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PCT/JP2004/009734 WO2006006208A1 (ja) | 2004-07-08 | 2004-07-08 | 無線基地局 |
JP2006527649A JPWO2006006208A1 (ja) | 2004-07-08 | 2004-07-08 | 無線基地局 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008053851A (ja) * | 2006-08-22 | 2008-03-06 | Ntt Docomo Inc | データ流入量制御装置及びデータ流入量制御方法 |
JP2008099055A (ja) * | 2006-10-13 | 2008-04-24 | Advanced Telecommunication Research Institute International | 負荷を制御可能な通信装置およびそれを備えた通信ネットワーク |
KR20100101471A (ko) * | 2009-03-09 | 2010-09-17 | 엘지이노텍 주식회사 | 데이터 송수신장치 및 그 제어방법 |
JP2011523528A (ja) * | 2008-05-09 | 2011-08-11 | クゥアルコム・インコーポレイテッド | 強化されたバックホール・フロー制御用技術 |
WO2011142328A1 (ja) * | 2010-05-13 | 2011-11-17 | 日本電気株式会社 | ネットワーク中継装置、QoS制御方法及びQoS制御プログラムを記録する記録媒体 |
JP2014241469A (ja) * | 2013-06-11 | 2014-12-25 | 株式会社Nttドコモ | 無線基地局装置およびバッファ制御方法 |
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JP2000106569A (ja) * | 1998-09-29 | 2000-04-11 | Nec Shizuoka Ltd | Lan間接続装置 |
JP2001024706A (ja) * | 1999-07-09 | 2001-01-26 | Nec Corp | パケット転送方法及びシステム |
JP2001358763A (ja) * | 2000-06-13 | 2001-12-26 | Nec Corp | 伝送容量制御方法および移動通信システム |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008053851A (ja) * | 2006-08-22 | 2008-03-06 | Ntt Docomo Inc | データ流入量制御装置及びデータ流入量制御方法 |
JP2008099055A (ja) * | 2006-10-13 | 2008-04-24 | Advanced Telecommunication Research Institute International | 負荷を制御可能な通信装置およびそれを備えた通信ネットワーク |
JP2011523528A (ja) * | 2008-05-09 | 2011-08-11 | クゥアルコム・インコーポレイテッド | 強化されたバックホール・フロー制御用技術 |
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KR20100101471A (ko) * | 2009-03-09 | 2010-09-17 | 엘지이노텍 주식회사 | 데이터 송수신장치 및 그 제어방법 |
KR101628358B1 (ko) | 2009-03-09 | 2016-06-08 | 엘지이노텍 주식회사 | 데이터 송수신장치 및 그 제어방법 |
WO2011142328A1 (ja) * | 2010-05-13 | 2011-11-17 | 日本電気株式会社 | ネットワーク中継装置、QoS制御方法及びQoS制御プログラムを記録する記録媒体 |
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JP2014241469A (ja) * | 2013-06-11 | 2014-12-25 | 株式会社Nttドコモ | 無線基地局装置およびバッファ制御方法 |
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