CN1941954A - Method for controlling HSDPA flow based on feedback mode - Google Patents
Method for controlling HSDPA flow based on feedback mode Download PDFInfo
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- CN1941954A CN1941954A CNA2005101056611A CN200510105661A CN1941954A CN 1941954 A CN1941954 A CN 1941954A CN A2005101056611 A CNA2005101056611 A CN A2005101056611A CN 200510105661 A CN200510105661 A CN 200510105661A CN 1941954 A CN1941954 A CN 1941954A
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Abstract
The method comprises: NodeB calculates the desired stack and current stack of current MAC-D-QUE queue, and decides if the current stack is within the preset control range of initiation traffic; if yes, NodeB subtracts the current stack from the desired stack to get stack difference; according to the ratio of stack difference to the desired stack, and the output speed of transmitting HSDPA data from MAC-D-QUE queue to UU port, the NodeB calculates the input speed of transmitting data from RNC to MAC-D-QUE queue through Iub, and according to the input speed, calculates the relevant traffic control parameter; according to the parameter, forming the capacity allocation control frame that is sent to RNC; according to the capacity allocation control frame, RNC adjusts the HSDPA data transmission speed from Iub port to the base-station.
Description
Technical field
The present invention relates to WCDMA (Wideband Code Division Multiple Access (WCDMA)) system, especially relate in a kind of WCDMA system HSDPA (high speed downlink packet access) flow control methods based on feedback system.
Background technology
In the WCDMA system, in order to satisfy for needs such as business such as download or Streaming Media classes, system should provide higher transmission rate and delay still less, therefore need improve air interface, so introduced the HSDPA technology, this technology can make the peak rate of single subdistrict up to 14Mbit/s.Yet, in the HSDPA technology, flow control is a very crucial link, and the flow control of HSDPA should guarantee that HSMAC (high speed medium access key-course) has sufficient data dispatch, avoids again going up the overlong time of storage and causing abandoning of packet at NodeB (base station) as far as possible.
In the existing HSDPA Business Processing, the control of NodeB effluent amount is generally: NodeB receives the HSDPA capability requests control frame of RNC (radio network controller), submits to the calculating that HSMAC carries out flow control parameters; Then, NodeB forms HSDPA capability distribution control frame according to Flow Control result of calculation, sends to RNC, and RNC sends the HSDPA data to NodeB according to this HSDPA capability distribution control frame.Therefore as can be known, existing NodeB effluent amount control is only triggered by RNC transmitting capacity request control frame, and NodeB self can't initiatively initiate, be that NodeB can't monitor and manage the flow of NodeB side, this will be unfavorable for improving the HSDPA schedule speed of NodeB and the utilization ratio of NodeB buffering area, also can cause MAC-d PDU (protocol Data Unit of MAC-d layer) packet buffer to overflow and abandon, thereby have influence on the efficient of whole communication system with MAC-d PDU grouping.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of HSDPA flow control methods based on feedback system, adopt the present invention can not only improve the HSDPA schedule speed of base station and the utilization ratio of base station buffering area, and can also reduce MAC-d PDU packet buffer and overflow with MAC-d PDU grouping and abandon, thereby strengthened the efficient of whole communication system, for the user provides good HSDPA service.
In order to solve the problems of the technologies described above, the invention provides a kind of HSDPA flow control methods based on feedback system, comprise the steps:
(a1) the expectation accumulation and the current accumulation of current MAC-D-QUE formation MAC-D PDU packet calculated in the base station;
(a2) base station judges whether current accumulation is in the scope of the initiation flow control that sets in advance, if, execution in step (a4), otherwise, execution in step (a3);
(a3) base station judges whether to receive the capability requests control frame from radio network controller, if, execution in step (a4), otherwise do not carry out the HSDPA flow control, finish this flow process;
(a4) base station will be expected to pile up and be deducted current accumulation and obtain piling up poor, and pass through U to pile up difference with ratio, the MAC-D-QUE formation of expectation accumulation
UMouthful output speed that sends the HSDPA data to user terminal calculates radio network controller sends the HSDPA data to the MAC-D-QUE formation by the Iub mouth expectation input speed as parameter;
(a5) base station is according to expecting that input speed calculates the relevant flow control parameters in the capability distribution control frame, and form the capability distribution control frame and be sent to radio network controller, radio network controller is adjusted it sends the HSDPA data to the base station by the Iub mouth speed according to the capability distribution control frame.
Further, the present invention also has following characteristics: the expectation of described current MAC-D-QUE formation MAC-DPDU packet is piled up and is the maximum accumulation of MAC-D-QUE formation MAC-D PDU packet and the product of expecting factor, and the maximum of MAC-D-QUE formation MAC-D PDU packet is piled up and passed through U for MAC-D-QUE formation MAC-D PDU packet in the time that abandons and the MAC-D-QUE formation of base station
UMouth is to the product of the output speed of user terminal transmission HSDPA data, and perhaps the maximum of MAC-D-QUE formation MAC-D PDU packet is piled up and passed through U for MAC-D-QUE formation MAC-D PDU packet in the average retention time and the MAC-D-QUE formation of base station
UMouthful send 1.5 times of product of the output speed of HSDPA data to user terminal, expecting factor be one less than 1 positive number.
Further, the present invention also has following characteristics: the scope of described initiation flow control is for initiating Upper threshold or initiating Lower Threshold less than Flow Control greater than Flow Control, wherein Flow Control initiates to be limited to the doorstep the product that maximum is piled up and Flow Control is initiated the Upper threshold factor of MAC-D-QUE formation MAC-D PDU packet, Flow Control is initiated the product that maximum is piled up and Flow Control is initiated the Lower Threshold factor that the Xiamen is limited to MAC-D-QUE formation MAC-D PDU packet, the Flow Control initiation Lower Threshold factor and the Flow Control initiation Upper threshold factor are the positive number less than 1, Flow Control is initiated the Lower Threshold factor less than expecting factor, and expecting factor is initiated the Upper threshold factor less than Flow Control.
Further, the present invention also has following characteristics: the method for calculation expectation input speed comprises linear processing methods, square processing method and evolution processing method in the described step (a4).
Further, the present invention also has following characteristics: the relevant flow control parameters in the described capability distribution control frame comprises the bag number that requires radio network controller to send MAC-D PDU packet in Transmission Time Interval, the Transmission Time Interval and the number of times of repetition period.
Further, the present invention also has following characteristics: described Transmission Time Interval is 1 (whether being 1 millisecond), require radio network controller to send the ratio of the bag number of MAC-d PDU packet for expectation input speed and maximum MAC-d PDU data packet length in the Transmission Time Interval, the number of times of repetition period is user buffering district capacity and the ratio of expecting input speed.
Further, the present invention also has following characteristics: described expecting factor, Flow Control initiate the Upper threshold factor and the Flow Control initiation Lower Threshold factor can be adjusted accordingly according to the needs of actual conditions.
Compared with prior art, the present invention has the following advantages:
NodeB passes through U with the accumulation difference of current MAC-D-QUE formation MAC-D PDU packet with ratio, MAC-D-QUE formation that expectation is piled up among the present invention
UMouth sends the output speed of HSDPA data as parameter to user terminal, calculate RNC and send the expectation input speed of HSDPA data to the MAC-D-QUE formation, and form the control that the capability distribution control frame realizes RNC is sent to NodeB data traffic thus by the Iub mouth; In addition, NodeB can also determine whether initiatively initiating flow control according to the current accumulation of current MAC-D-QUE formation MAC-D PDU packet, so can not only improve the HSDPA schedule speed of NodeB and the utilization ratio of base station buffering area, and can also reduce MAC-d PDU packet buffer and overflow with MAC-d PDU grouping and abandon, thereby strengthened the efficient of whole communication system, for the user provides good HSDPA service.
Description of drawings
Fig. 1 is the flow control schematic diagram that the present invention is based on the HSDPA flow control methods of feedback system;
Fig. 2 is the current accumulation of MAC-D-QUE formation MAC-D PDU packet among the present invention schematic diagram that NodeB initiatively initiates Flow Control when being lower than Flow Control and initiating Lower Threshold;
Fig. 3 is the current accumulation of MAC-D-QUE formation MAC-D PDU packet among the present invention schematic diagram that NodeB initiatively initiates Flow Control when being higher than Flow Control and initiating Upper threshold;
Fig. 4 is the schematic diagram that RNC initiatively initiates Flow Control among the present invention.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, among the present invention each MAC-D-QUE formation MAC-DPDU packet of NodeB side is piled up buffering area and regard a MAC-hs (vocabulary of terms on the above release protocol of 3GPP R5 as, refer to that medium access control-high speed downlink packet inserts) Buffer Pool, pass through the input speed of Iub mouth to MAC-D-QUE formation transmission HSDPA data if Vin is RNC, Vout passes through U for the MAC-D-QUE formation
UMouth is to the output speed (sub-district throughput) of user terminal transmission HSDPA data, and DiscardTime is that MAC-D-QUE formation MAC-D PDU packet is at the time that abandons of base station, H
CURRENTCurrent accumulation for MAC-D-QUE formation MAC-D PDU packet, the maximum height of Buffer Pool (maximum that is MAC-D-QUE formation MAC-D PDU packet is piled up) is so: Hmax=Vout * DiscardTime, for the MAC-D-QUE formation that does not abandon the time, be T the average time that MAC-D PDU packet keeps in NodeB, and the maximum height of Buffer Pool can be 1.5T * Vout.
As Vin during greater than Vout, the Buffer Pool water surface can rise, in the time
After overflow; When Vin equaled Vout, the Buffer Pool water surface remained unchanged; As Vin during less than Vout, the Buffer Pool water surface can descend, in the time
Can expose at the bottom of the pond, should avoid overflowing and the appearance of show-through situation.
The HSDPA flow control methods that the present invention is based on feedback system comprises the steps:
Step 101, NodeB calculates the expectation of current MAC-D-QUE formation MAC-D PDU packet and piles up H
AIMWith current accumulation H
CURRENT, H is piled up in this expectation
AIMBe Hmax * P
AIM, P wherein
AIMBe the expectation pile factor, be one less than 1 positive number, concrete numerical value can be provided with according to the needs of actual conditions;
Step 102, NodeB judges current accumulation H
CURRENTWhether be in the scope of the initiation flow control that sets in advance, if NodeB initiatively initiates Flow Control, execution in step 104, otherwise, execution in step 103, the scope of wherein initiating flow control is for initiating Upper threshold H greater than Flow Control
HOr less than Flow Control initiation Lower Threshold H
L, H
H=Hmax * P
H, H
L=Hmax * P
L, P
H, P
LRefer to that respectively Flow Control is initiated the Upper threshold factor and Flow Control is initiated the Lower Threshold factor, be one less than 1 positive number, and 1＞P
H＞P
AIM＞P
L＞0, concrete numerical value can be provided with according to the needs of actual conditions;
Step 103, NodeB judges whether to receive the capability requests control frame from RNC, if, initiate Flow Control by RNC, execution in step 104, otherwise do not carry out the HSDPA flow control, finish this flow process;
Step 104, NodeB will expect to pile up H
AIMDeduct current accumulation H
CURRENTObtain piling up poor H
DIFFER, i.e. H
DIFFER=H
AIM-H
CURRENT, work as H
CURRENTH when being lower than Flow Control initiation Lower Threshold
DIFFERFor on the occasion of, work as H
CURRENTH when being higher than Flow Control initiation Upper threshold
DIFFERBe negative value, and to pile up poor H
DIFFERPile up H with expectation
AIMRatio, Vout as parameter, handle calculating RNC and send the expectation input speed of HSDPA data, Vaim=F (Vout, H to the MAC-D-QUE formation by the Iub mouth
DIFFER/ H
AIM), handle computational methods and include linear processing methods, evolution processing method and square processing method etc., linear processing methods for example, the formula of calculation expectation input speed is: Vaim=((H
DIFFER/ H
AIM) * K+1) * Vout;
Step 105, NodeB calculates relevant flow control parameters in the capability distribution control frame according to Vaim, this flow control parameters comprises Credits (requiring RNC to send the bag number of MAC-D PDU packet in the Transmission Time Interval), Interval (Transmission Time Interval), Repetition Period (number of times of repetition period), suppose the big or small data of User Buffer Size (user buffering district capacity) of the enough buffer memory RNC of MAC-D PDU buffering area of NodeB, can adopt following simple computation processing method:
Credits=Vaim/Max MAC-D PDU Length; Interval=1 (whether being 1 millisecond);
Repetition?Period＝User?Buffer?Size/Vaim，
And form the capability distribution control frame and be sent to RNC, RNC adjusts it according to the capability distribution control frame and sends the speed Vin of HSDPA data by the Iub mouth to NodeB, thereby realizes flow control.
Shown in Figure 2 is that NodeB initiatively initiates the schematic diagram of Flow Control when the current accumulation that detects MAC-D-QUE formation MAC-D PDU packet is lower than Flow Control initiation Lower Threshold; Shown in Figure 3 is that NodeB initiatively initiates the schematic diagram of Flow Control when the current accumulation that detects MAC-D-QUE formation MAC-D PDU packet is higher than Flow Control initiation Upper threshold; The schematic diagram that Fig. 4 initiatively initiates Flow Control for RNC.
Claims (10)
1, a kind of HSDPA flow control methods based on feedback system comprises the steps:
(a1) the expectation accumulation and the current accumulation of current MAC-D-QUE formation MAC-D PDU packet calculated in the base station;
(a2) base station judges whether current accumulation is in the scope of the initiation flow control that sets in advance, if, execution in step (a4), otherwise, execution in step (a3);
(a3) base station judges whether to receive the capability requests control frame from radio network controller, if, execution in step (a4), otherwise do not carry out the HSDPA flow control, finish this flow process;
(a4) base station will be expected to pile up and be deducted current accumulation and obtain piling up poor, and pass through U to pile up difference with ratio, the MAC-D-QUE formation of expectation accumulation
UMouthful output speed that sends the HSDPA data to user terminal calculates radio network controller sends the HSDPA data to the MAC-D-QUE formation by the Iub mouth expectation input speed as parameter;
(a5) base station is according to expecting that input speed calculates the relevant flow control parameters in the capability distribution control frame, and form the capability distribution control frame and be sent to radio network controller, radio network controller is adjusted it sends the HSDPA data to the base station by the Iub mouth speed according to the capability distribution control frame.
2, the HSDPA flow control methods based on feedback system according to claim 1, it is characterized in that: the expectation of described current MAC-D-QUE formation MAC-D PDU packet is piled up and is the maximum accumulation of MAC-D-QUE formation MAC-D PDU packet and the product of expecting factor, and the maximum of MAC-D-QUE formation MAC-D PDU packet is piled up and passed through U for MAC-D-QUE formation MAC-D PDU packet in the time that abandons and the MAC-D-QUE formation of base station
UMouthful send the product of the output speed of HSDPA data to user terminal, expecting factor be one less than 1 positive number.
3, the HSDPA flow control methods based on feedback system according to claim 1, it is characterized in that: the expectation of described current MAC-D-QUE formation MAC-D PDU packet is piled up and is the maximum accumulation of MAC-D-QUE formation MAC-D PDU packet and the product of expecting factor, and the maximum of MAC-D-QUE formation MAC-D PDU packet is piled up and passed through U for MAC-D-QUE formation MAC-D PDU packet in the average retention time and the MAC-D-QUE formation of base station
UMouthful send 1.5 times of product of the output speed of HSDPA data to user terminal, expecting factor be one less than 1 positive number.
4, according to claim 2 or 3 described HSDPA flow control methods based on feedback system, it is characterized in that: the scope of described initiation flow control is for initiating Upper threshold or initiating Lower Threshold less than Flow Control greater than Flow Control, wherein Flow Control initiates to be limited to the doorstep the product that maximum is piled up and Flow Control is initiated the Upper threshold factor of MAC-D-QUE formation MAC-D PDU packet, Flow Control is initiated the product that maximum is piled up and Flow Control is initiated the Lower Threshold factor that the Xiamen is limited to MAC-D-QUE formation MAC-D PDU packet, the Flow Control initiation Lower Threshold factor and the Flow Control initiation Upper threshold factor are the positive number less than 1, Flow Control is initiated the Lower Threshold factor less than expecting factor, and expecting factor is initiated the Upper threshold factor less than Flow Control.
5, the HSDPA flow control methods based on feedback system according to claim 4 is characterized in that: the method for calculation expectation input speed comprises linear processing methods in the described step (a4).
6, the HSDPA flow control methods based on feedback system according to claim 4 is characterized in that: the method for calculation expectation input speed comprises a square processing method in the described step (a4).
7, the HSDPA flow control methods based on feedback system according to claim 4 is characterized in that: the method for calculation expectation input speed comprises the evolution processing method in the described step (a4).
8, the HSDPA flow control methods based on feedback system according to claim 1 is characterized in that: the relevant flow control parameters in the described capability distribution control frame comprises the bag number that requires radio network controller to send MAC-D PDU packet in Transmission Time Interval, the Transmission Time Interval and the number of times of repetition period.
9, the HSDPA flow control methods based on feedback system according to claim 8, it is characterized in that: described Transmission Time Interval is 1 (whether being 1 millisecond), require radio network controller to send the ratio of the bag number of MAC-d PDU packet for expectation input speed and maximum MAC-d PDU data packet length in the Transmission Time Interval, the number of times of repetition period is user buffering district capacity and the ratio of expecting input speed.
10, the HSDPA flow control methods based on feedback system according to claim 4 is characterized in that: described expecting factor, Flow Control initiate the Upper threshold factor and the Flow Control initiation Lower Threshold factor can be adjusted accordingly according to the needs of actual conditions.
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| CN102457909A (en) * | 2010-10-27 | 2012-05-16 | 普天信息技术研究院有限公司 | Iub port flow control method based on target buffer |
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| CN103634080A (en) * | 2012-08-29 | 2014-03-12 | 中兴通讯股份有限公司 | Data scheduling processing method and device |
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