CN1937594A - Method and device for allocating cache quene threshold, and its flow control method and device - Google Patents
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Abstract
The invention discloses a buffer queue threshold configuring method and device, for dynamically configuring MAC-hs buffer queue threshold in wideband code division multiple access (WCDMA) system, and arranging at least two data waiting delay parameters in buffer queue; obtaining data output velocity V in the buffer queue; and using the product of each waiting delay parameter and data output velocity V to configure the threshold of the current buffer queue. And it also discloses a flow control method and device, after the above threshold is updated, regulating data input bandwidth of the buffer queue and making flow control. According to the data output velocity of the buffer queue, it correspondingly regulates the buffer queue threshold and controls the flow, thus making the data length in the buffer queue being in a proper range, and assuring the buffer queue can provide enough data for aerial interface to transmit, reducing data length in the buffer queue and data processing waiting time.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the method for dynamic-configuration cache quene threshold in the broadband CDMA system and the method and the device thereof of device and flow control thereof.
Background technology
Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Access) the R5 version (R5 of system, Release 5) high-speed downlink packet access (HSDPA proposed, HighSpeed Downlink Packet Access) technology, thereby realized grouped data sharing on channel code and transmitting power, improved the handling capacity of down link.The key technology of HSDPA has Adaptive Modulation and Coding technology (AMC, Adaptive Modulation and Coding), mixes automatic retransmission technique (HARQ, Hybrid Automatic Repeat Request) and fast dispatch technology.Wherein, the fast dispatch technology is passed through from radio network controller (RNC, Radio Network Controller) medium access control layer (MAC, Mdium Access Control) branch splits out a high speed media access control (MAC-hs, Mdium Access Control-High Speed) entity, and this MAC-hs entity put into base station (Node B), be used to realize the quick resource allocation between a plurality of users.
After the MAC layer is split, MAC-d protocol Data Unit (the PDU that generates among the RNC, Protocol Data Unit) at first is packaged into high-speed downlink shared channel (HS-DSCH, HighSpeed Downlink Shared Channel) data frame structure, be sent in the MAC-hs entity among the NodeB by Iub interface then, and be buffered in the MAC-hs buffer queue.By the Mac-hs scheduling, be buffered in the data output buffers formation in the MAC-hs buffer queue, and be sent to subscriber equipment (UE, User Equipment) side by air interface.When data stacking was too much in the MAC-hs buffer queue, data were waited for the increase in processing time in the buffer queue, and the data that abandon in old sub-district in the handoff procedure also can increase; When MAC-hs buffer queue data are very few, the MAC-hs buffer queue can not provide enough data to be used for transmitting in the scheduling process, thereby cause the waste of the transmission bandwidth of air interface.Therefore, for fear of or reduce the problems referred to above, need the input and output speed of data in the control MAC-hs buffer queue, make that data length is in a suitable scope in the MAC-hs buffer queue.
Be by controlling data length in the MAC-hs buffer queue in the prior art: when data length is below or above a certain thresholding in the buffer queue for the MAC-hs buffer queue disposes high and low thresholding, to trigger the flow control incident, Node B adjusts link bandwidth between Node B and the RNC according to the flow control incident, thereby MAC-hs buffer queue data length is changed towards the direction of expectation.Fig. 1 is the schematic diagram of the high and low thresholding of buffer queue in the prior art, is provided with two thresholdings for the data length in the buffer queue among Fig. 1: formation high threshold and formation low threshold.When data length in the buffer queue will trigger the flow control incident during greater than high threshold, Node B reduces link bandwidth between Node B and the RNC according to this flow control incident, thereby make that the input rate of data reduces in the buffer queue, reach the purpose that reduces data length in the buffer queue; When data length in the buffer queue during less than low threshold, Node B then increases the link bandwidth between Node B and the RNC, thereby increases the input rate of data in the buffer queue, makes that data length increases in the buffer queue.
Prior art is to control the data input rate of buffer queue according to the fixed gate limit value, and then adjusts the data length in the buffer queue.And the shortcoming of this method is, fixing cache quene threshold value can not reflect the data output rate of buffer queue, for example, when and data output rate buffer queue lower when the setting of MAC-hs cache quene threshold is big, data in the buffer queue may be transferred sky so, and then influence the throughput of air interface; The data output rate that higher and buffer queue is set when the MAC-hs cache quene threshold hour, thereby the data in the buffer queue may be piled up to cause and can't be received new data so, cause the rising of packet loss and cause data repeatedly retransmit and Node B and RNC between the decline of effective throughput of link.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and device of allocating cache quene threshold, be buffer queue dynamic-configuration thresholding, make the thresholding of buffer queue dynamically to adjust according to the data output rate of buffer queue; Another object of the present invention is to also provide a kind of method and device of flow control, buffer queue is carried out flow control.
Based on above-mentioned purpose, the invention provides a kind of method of allocating cache quene threshold, at least two the wait delay parameter of data in buffer queue is set; Obtain data output rate V in the buffer queue; Wait for the thresholding of the product configuration current cache formation of delay parameter and data output rate with described each.
Based on above-mentioned purpose, the present invention also provides a kind of device of allocating cache quene threshold, and this device comprises: wait for that time delay is provided with module, and data output rate acquisition module and thresholding configuration module, wherein,
Described wait time delay is provided with module, and the data that are used for being provided with at least two are at the wait delay parameter of buffer queue;
Described data output rate acquisition module is used for obtaining buffer queue data output rate V;
Described thresholding configuration module, each that is used for being provided with described wait time delay that module is provided with waited for delay parameter, the product of the data output rate V that obtains with described data output rate acquisition module, the thresholding of configuration current cache formation.
Based on above another purpose, the invention provides a kind of flow control methods, at least two the wait delay parameter of data in buffer queue is set; Obtain data output rate V in the buffer queue; Wait for the thresholding of the product configuration current cache formation of delay parameter and data output rate with described each; Utilize the cache quene threshold of configuration to determine the buffer status that buffer queue is current, distribute the data input bandwidth of this buffer queue.
Based on above another purpose, the present invention also provides a kind of volume control device, is used for buffer queue is carried out flow control, this device comprises: wait for that time delay is provided with module, data output rate acquisition module, thresholding configuration module, and bandwidth allocation module, wherein
Described wait time delay is provided with module, and the data that are used for being provided with at least two are at the wait delay parameter of buffer queue;
Described data output rate acquisition module is used for obtaining buffer queue data output rate V;
Described thresholding configuration module, each that is used for being provided with described wait time delay that module is provided with waited for delay parameter, the product of the data output rate V that obtains with described data output rate acquisition module, the thresholding of configuration current cache formation;
Described bandwidth allocation module, the cache quene threshold that is used to utilize described thresholding configuration module to determine is determined the buffer status that buffer queue is current, distributes the data input bandwidth of this buffer queue.
The method of allocating cache quene threshold of the present invention and device, by transforming fixed threshold of the prior art as the on-fixed thresholding, adjust threshold value according to the rate dynamic of the data output buffers formation that measures in real time, thereby make the threshold value of buffer queue to change with the variation of the current data output rate of buffer queue.The method of flow control of the present invention and device, after above-mentioned dynamic adjustment buffer threshold, further determine the buffer status that buffer queue is current according to data volume in the buffer queue and buffer threshold, and adjust the data inputs bandwidth of this buffer queue according to buffer status, make the data input rate of this buffer queue to adjust according to the data output rate of buffer queue and the data volume in the current cache, guarantee that the data volume in this buffer queue is in a suitable scope, neither can pile up, can provide enough data to transmit again for air interface, thereby reduced packet loss, and improved the throughput of air interface.
Description of drawings
Fig. 1 is the schematic diagram of the high and low thresholding of buffer queue in the prior art;
Fig. 2 is the flow chart of the method for embodiment of the invention allocating cache quene threshold;
Fig. 3 is the schematic diagram of a kind of typical buffer status of buffer queue of the present invention;
Fig. 4 is the flow chart of the method for embodiment of the invention flow control;
Fig. 5 is the structural representation of the device of embodiment of the invention allocating cache quene threshold;
Fig. 6 is the structural representation of the device of embodiment of the invention flow control.
Embodiment
The speed of data input rank is relevant with link bandwidth between Node B and the RNC in the MAC-hs buffer queue, and bandwidth is big more, and the speed that data are gone into formation is just high more, otherwise that data are gone into the speed of formation is just low more; Then the speed with actual air interface is relevant for the speed of dequeuing data row in the MAC-hs buffer queue.When the air interface rate of MAC-hs buffer queue correspondence was higher, the data output rate of buffer queue was bigger, and the data length that is allowed in the buffer queue is also long more; Otherwise then the data output rate of buffer queue is less, and the data length that is allowed in the buffer queue is also short more.
The method of allocating cache quene threshold provided by the invention and flow control methods, a flow control cycle is set, periodic data output rate according to buffer queue, adjust the threshold value of buffer queue, and according to the in-cache status of buffer queue, be adjusted into the link bandwidth between preallocated above-mentioned NodeB of this buffer queue and the RNC, it is the data input bandwidth of buffer queue, thereby control the data input rate of buffer queue, and then the length of data in the buffer queue is controlled at suitable scope.
The data output rate of MAC-hs buffer queue is relevant with the speed of air interface, and specifically by the practical application scene, as decisions such as channel quality, UE ability ratings, for example, channel quality is good more, and the data output rate of MAC-hs buffer queue is just big more; Under the equal channel quality condition, the UE that ability rating is higher, the data output rate of its pairing MAC-hs buffer queue is just big more.The method of allocating cache quene threshold provided by the invention, can come the dynamic-configuration thresholding by the data output rate of real-time measurement MAC-hs buffer queue, simultaneously, because the data output rate difference of the pairing buffer queue of different ability rating UE, so the present invention also can dispose the thresholding of MAC-hs buffer queue according to the ability rating of UE.
With the data output rate based on real-time measurement buffer queue, the method for allocating cache quene threshold is an example below, and the present invention will be described by specific embodiment.
In the present embodiment, definition and corresponding one group of time parameter: the TM of high and low thresholding
HAnd TM
L, represent the maximum wait time delay of data in buffer queue and the minimum time delay of waiting for respectively.TM
HAnd TM
LOccurrence can set according to actual application environment and empirical value; Be set a flow control measuring period, in this flow control measuring period, the data output rate of MAC-hs buffer queue measured, and according to measuring gained rate configuration cache quene threshold; A timer is set, is used for this flow control cycle timing.The flow chart of present embodiment allocating cache quene threshold as shown in Figure 2, this flow process may further comprise the steps:
20, Node B is provided with and preserves TM
HAnd TM
LParameter;
21, after the flow control cycle began, Node B started the timer timing, and added up the data volume that the MAC-hs buffer queue is exported in this cycle; When timer expiry, promptly during the flow control end cycle, the timeing closing device, the data volume that statistics is obtained promptly obtains data output rate Vout divided by the duration in flow control cycle;
22, Node B is according to the threshold value of the data output rate calculating buffer queue that obtains in the step 21, and wherein, wealthy family is limited to Vout * TM
H, low threshold is Vout * TM
L, and reconfigure the high and low thresholding of buffer queue according to the aforementioned calculation result; When entering next flow control during the cycle, jump to step 21.
In said process, for method based on the ability rating allocating cache quene threshold of UE, the threshold value of the calculating buffer queue in the described step 21, also can be by obtaining the ability rating parameter of UE, with the maximum air interface rate Vmax of this UE ability rating correspondence as data output rate, calculate threshold value, wherein, wealthy family is limited to Vmax * TM
H, low threshold is Vmax * TM
L, other steps are all identical with method based on the data output rate configured threshold of real-time measurement MAC-hs buffer queue.
According to prior art, institute's interactive signaling that obtaining of above-mentioned UE ability rating can be controlled by Radio Resource in the process that (RRC, Radio Resources Control) connect obtains.Connect at RRC and to set up in the process, UE is included in its ability rating parameter in the UE wireless access capability parameter (UE radio access capability) in the RRC connection setup complete message and reports UTRAN.UTRAN also can initiatively send demand signalling to UE, obtains the ability rating parameter of this UE.Can obtain the pairing maximum air interface rate of this UE according to the UE ability rating.
Among the embodiment of above-mentioned threshold configuration method, two time parameter TM have been defined
HAnd TM
L, and the product of the data output rate of time parameter and buffer queue obtained high and low two thresholdings as threshold value.Above-mentioned high and low threshold value is the product of data output rate and time, its physical meaning is a data volume, as shown in Figure 3, above-mentioned high and low two thresholdings are divided into 3 buffer status with buffer queue: when the current data amount in the buffer queue during less than low threshold, the in-cache status of this buffer queue is the L attitude; When the current data amount in the buffer queue during greater than high threshold, the in-cache status of this buffer queue is the H attitude; When the current data amount in the buffer queue was between high and low thresholding, the in-cache status of this buffer queue was the M attitude.The in-cache status of described buffer queue is by relatively the current data amount and the current thresholding of buffer queue are determined.
Obviously, can also be among the present invention by N similar time parameter of definition, wherein N＞2 obtain the thresholding with the corresponding N of each time parameter, are that buffer queue is divided N+1 buffer status.
The present invention also provides a kind of flow control methods, after above-mentioned steps 22, further this buffer queue is carried out flow control: pre-defined different scale factor, correspond respectively to different buffer status, adjust the bandwidth of the input data of buffer queue according to the in-cache status of buffer queue.
As shown in Figure 4, after above-mentioned steps 22, flow control methods of the present invention is further comprising the steps of:
23, according to the current data amount of buffer queue and the magnitude relationship of current thresholding, determine the in-cache status of buffer queue;
24, in advance for each buffer status of buffer queue is provided with scale factor respectively, distribute the data input bandwidth of this buffer queue according to the in-cache status of buffer queue; When entering next flow control during the cycle, jump to step 21.
Here, the number of the buffer status of the buffer queue in the step 23 is predetermined.Because thresholding is according to the data output rate dynamic-configuration of buffer queue in each flow control cycle, thereby the scope of the pairing data volume of each buffer status changes.
In the step 24, the data input bandwidth of distributing this buffer queue according to the in-cache status of buffer queue, specifically comprise: select corresponding scale factor according to the buffer status of current cache formation, the data output rate of this scale factor and buffer queue is multiplied each other, this product as the preassignment bandwidth, is this buffer queue distribute data input bandwidth.For example, for buffer queue shown in Figure 3, the scale factor a of H attitude is set respectively
H=0, the scale factor a of M attitude
M=1, the scale factor a of L attitude
L=1.2, if judge in the step 24 that the buffer status that obtains this buffer queue is the L attitude, the data input bandwidth of then distributing for this buffer queue in step 24 is exactly a
L* Vout, wherein a
L=1.2, Vout is the data output rate of buffer queue, thereby the data input bandwidth of this buffer queue is increased, to increase the data volume in the buffer queue; If judge in the step 24 that the buffer status that obtains this buffer queue is the H attitude, then the data input bandwidth of this buffer queue distribution is exactly a
H* Vout, wherein a
H=0, that is,, overflow in order to prevent buffer memory owing in the buffer queue abundant data have been arranged, so reduce data input bandwidth, RNC no longer sends out data in the buffer memory of Node B.
Buffer queue in the foregoing description only is provided with H attitude, M attitude and three kinds of buffer status of L attitude, and when realization is of the present invention, can certainly also scale factor be set respectively to obtain more buffer status for buffer queue is provided with more thresholding, thereby make the data length in the buffer queue more meet desired length for each buffer status.But increase too much state, can increase the up signaling consumption of Node B to RNC.The foregoing description is a preferred embodiment after control is taken all factors into consideration to signaling consumption and buffer memory.Equally, the value of given scale factor in the foregoing description is to implement a kind of preferred values of the present invention, but the present invention is not and be limited to above-mentioned occurrence.
As shown in Figure 5, based on the method for above-mentioned allocating cache quene threshold, the present invention also provides a kind of device of allocating cache quene threshold, and this device comprises: wait for that time delay is provided with module 50, data output rate acquisition module 51, and thresholding configuration module 52.This device can be arranged among the Node B.
Wherein, described wait time delay is provided with and preserves at least two wait delay parameters in the module 50.
After the flow control cycle began, described data output rate acquisition module 51 obtained the data output rate of buffer queue and resulting data output rate is sent to thresholding configuration module 52.
Obtaining of 51 pairs of data output speeds of described data output rate acquisition module can realize by dual mode at least: first kind of mode is that the timer module in the log-on data output speed acquisition module 51 510 is carried out timing when the flow control cycle begins, the output data quantity of data output rate acquisition module 51 statistics buffer queues, during end cycle, stop the timing of timer module 510, thereby the data volume that statistics is obtained obtains data output rate Vout divided by the duration in flow control cycle.Can utilize the ability rating of the UE of this buffer queue correspondence of obtaining from UE in addition, with the maximum air interface rate of this ability rating correspondence data output rate Vout as buffer queue;
When each flow control end cycle, described thresholding configuration module 52 will wait for that time delay is provided with module 50 definite wait delay parameters and multiplies each other with the quantity output speeds that data output rate acquisition module 51 is determined respectively, and with above-mentioned product respectively as new threshold value, reconfigure the thresholding of buffer queue.
As shown in Figure 6, based on above-mentioned flow control methods, the present invention also provides a kind of volume control device, be used for buffer queue is carried out flow control, this volume control device is on the basis of the device of allocating cache quene threshold shown in Figure 5, increased bandwidth allocation module 53, this bandwidth allocation module 53 further comprises buffer status determination module 530 again.This volume control device is used for when each Flow Control end cycle, is buffer queue distribute data input bandwidth according to the buffer status of buffer queue.
Wherein, data output rate acquisition module 51 further is sent to bandwidth allocation module 53 with resulting data output rate after obtaining the data output rate of buffer queue;
When each flow control end cycle, buffer status determination module 530 is according to the current data amount of buffer queue, by the in-cache status with current data amount and the relatively more definite buffer queue of current thresholding; Bandwidth allocation module 53 is selected corresponding scale factor according to in-cache status that buffer status determination module 530 is determined, this scale factor and data output rate acquisition module 51 determined data output rates are multiplied each other, and with this product as the preassignment bandwidth, be this buffer queue distribute data input bandwidth, thereby adjust the data input rate of buffer queue, and then realize flow control function.
In sum, the method of the described allocating cache quene threshold of inventive embodiments and flow control methods and device, according to the thresholding of the data output rate dynamic-configuration buffer queue of buffer queue and carry out flow control, make the data length in the buffer queue be in a suitable scope, when guaranteeing that buffer queue can provide enough data for the air interface transmission, the pending times such as data length in the buffer queue and data have been reduced.
The above only is embodiments of the invention, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. the method for an allocating cache quene threshold is characterized in that, at least two the wait delay parameter of data in buffer queue is set; Obtain data output rate V in the buffer queue; Wait for the thresholding of the product configuration current cache formation of delay parameter and data output rate with described each.
2. the method for claim 1 is characterized in that, described wait delay parameter is the maximum wait delay parameter TMs of data in buffer queue
HWait for delay parameter TM with minimum
L
The thresholding of described configuration current cache formation is: the wealthy family of configuration current cache formation is limited to V * TM
H, the low threshold of configuration current cache formation is V * TM
L
3. the method for claim 1, it is characterized in that, the described process of obtaining buffer queue data output rate V comprises: measure the output data quantity of buffer queue in the predefined time cycle, this data volume is obtained data output rate V divided by the described time cycle.
4. method as claimed in claim 3, it is characterized in that, the output data quantity of buffer queue comprises in the predefined time cycle of described measurement: a timer is set, starts this timer when the time cycle begins, begin to add up the output data quantity of buffer queue; During timer expiry, close this timer, finish the dateout quantitative statistics.
5. the method for claim 1, it is characterized in that, the described buffer queue data output rate V that obtains comprises: determine the maximum air interface rate of this UE according to the ability rating of the user equipment (UE) of this buffer queue correspondence, with the data output rate of above-mentioned maximum air interface rate as buffer queue.
6. the device of an allocating cache quene threshold is characterized in that comprising: wait for that time delay is provided with module, and data output rate acquisition module and thresholding configuration module, wherein,
Described wait time delay is provided with module, and the data that are used for being provided with at least two are at the wait delay parameter of buffer queue;
Described data output rate acquisition module is used for obtaining buffer queue data output rate V;
Described thresholding configuration module, each that is used for being provided with described wait time delay that module is provided with waited for delay parameter, the product of the data output rate V that obtains with described data output rate acquisition module, the thresholding of configuration current cache formation.
7. device as claimed in claim 6, it is characterized in that, described data output rate acquisition module is further used for adding up the output data quantity of buffer queue in the predefined time cycle, and this data volume is obtained data output rate V divided by the described time cycle.
8. device as claimed in claim 6, it is characterized in that, described data output rate acquisition module is further used for obtaining the ability rating of the UE of this buffer queue correspondence, and with the maximum air interface rate of this ability rating correspondence data output rate as buffer queue.
9. a flow control methods is characterized in that, at least two the wait delay parameter of data in buffer queue is set; Obtain data output rate V in the buffer queue; Wait for the thresholding of the product configuration current cache formation of delay parameter and data output rate with described each; Utilize the cache quene threshold of configuration to determine the buffer status that buffer queue is current, distribute the data input bandwidth of this buffer queue.
10. method as claimed in claim 9, it is characterized in that, the described process of obtaining buffer queue data output rate V comprises: measure the output data quantity of buffer queue in the predefined time cycle, this data volume is obtained data output rate V divided by the described time cycle.
11. method as claimed in claim 9, it is characterized in that, the described buffer queue data output rate V that obtains comprises: determine the maximum air interface rate of this UE according to the ability rating of the user equipment (UE) of this buffer queue correspondence, with the data output rate of above-mentioned maximum air interface rate as buffer queue.
12. method as claimed in claim 9 is characterized in that, the cache quene threshold of described utilization configuration is determined the buffer status that buffer queue is current, distributes the data input bandwidth of this buffer queue to comprise:
The current buffer status of buffer queue is determined in the comparison of the current data amount by buffer queue and the thresholding of current configuration;
Scale factor is set for each buffer status of buffer queue respectively in advance, and select corresponding scale factor according to the in-cache status of buffer queue, as the preassignment bandwidth, is this buffer queue distribute data input bandwidth with the product of the data output rate of this scale factor and buffer queue.
13. a volume control device is used for buffer queue is carried out flow control, it is characterized in that comprising: wait for that time delay is provided with module, the data output rate acquisition module, thresholding configuration module, and bandwidth allocation module, wherein,
Described wait time delay is provided with module, and the data that are used for being provided with at least two are at the wait delay parameter of buffer queue;
Described data output rate acquisition module is used for obtaining buffer queue data output rate V;
Described thresholding configuration module, each that is used for being provided with described wait time delay that module is provided with waited for delay parameter, the product of the data output rate V that obtains with described data output rate acquisition module, the thresholding of configuration current cache formation;
Described bandwidth allocation module is used to utilize described definite cache quene threshold to determine the buffer status that buffer queue is current, distributes the data input bandwidth of this buffer queue.
14. device as claimed in claim 13, it is characterized in that, described data output rate acquisition module is further used for adding up the output data quantity of buffer queue in the predefined time cycle, and this data volume is obtained data output rate V divided by the described time cycle.
15. device as claimed in claim 13, it is characterized in that, described data output rate acquisition module is further used for obtaining the ability rating of the UE of this buffer queue correspondence, and with the maximum air interface rate of this ability rating correspondence data output rate as buffer queue.
16. device as claimed in claim 13, it is characterized in that, further comprise the buffer status determination module in the described bandwidth allocation module, described buffer status determination module is used for determining the current buffer status of buffer queue by the current data amount of buffer queue and the comparison of current configured threshold;
Described bandwidth allocation module is further used for for each buffer status of buffer queue scale factor being set respectively in advance, and select corresponding scale factor according to the in-cache status of buffer queue, the product of the data output rate of the buffer queue that this scale factor and described data output rate acquisition module are obtained is this buffer queue distribute data input bandwidth as the preassignment bandwidth.
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