CN102404805B - Method and device for obtaining radio interface rate of user - Google Patents

Abstract

The invention provides a method for obtaining a radio interface rate of a user, which includes: for any user A, permitted data transmission amount within a present transmission time interval (TTI) is determined; and the radio interface rate of the user A corresponding to the present TTI is determined in a smooth filter mode according to the permitted data transmission amount within the present TTI. The method and device can reduce user surface transmission time delay and improve handling capacity of a subdistrict.

Description

A kind of user's radio interface rate acquisition methods and device

Technical field

The present invention relates to mobile communication technology, particularly a kind of user's radio interface rate acquisition methods and device.

Background technology

High-speed packet access (the HSPA+ of evolution, High Speed Packet Access Plus) in system, base station (NodeB) is the fair (PF of adoption rate conventionally, Proportional Fair) dispatching algorithm is dispatched user, this is mainly because PF dispatching algorithm has considered user's channel circumstance and the service fairness between user, can between throughput of system and service fairness, obtain certain compromise.Realize PF dispatching algorithm, first need to obtain user's radio interface rate.

In prior art, can obtain in the following ways user's radio interface rate, calculate:

$\stackrel{\‾}{R}\left(t\right)=\frac{B_{N\_\mathrm{TTI}}}{N.\mathrm{TTI}};---\left(1\right)$

Wherein,

the radio interface rate that represents user; N is positive integer, and its concrete value can be decided according to the actual requirements; TTI is Transmission Time Interval; B _{n_TTI}the data volume sum that represents transmission in current TTI N TTI before; Each TTI all needs to calculate once

But, can there is certain problem in actual applications in aforesaid way, as: the radio interface rate (N TTI) that can only reflect user in a period of time, cannot introduce more early time information before, and the channel circumstance of user in moving process gradually changes and have correlation, in addition, in actual schedule process because number of users is more or the reason of dispatching algorithm itself, may cause user seldom dispatched or be not scheduled within certain a period of time, therefore, get in the manner described above

can not reflect truly user's radio interface rate situation, thereby affect subsequent treatment.In addition, because aforesaid way is in each calculating time, the data volume of transmission in the top n TTI that all needs to use, correspondingly, just needs the data volume of transmission in each TTI of real time record, can increase so undoubtedly the occupancy of memory headroom.

For this reason, the mode that another obtains user's radio interface rate is proposed again, i.e. smothing filtering mode in prior art:

$\stackrel{\‾}{R}\left(t\right)=(1-a).\stackrel{\‾}{R}(t-1)+a.R\left(t\right);---\left(2\right)$

Wherein, the radio interface rate that represents user; A is filter factor, and concrete value can be decided according to the actual requirements; R (t) represents momentary rate, by the data volume of transmission in current TTI, divided by TTI, calculates, if the data volume of transmission is 0 in current TTI, the value of R (t) will be also 0; Each TTI all needs to calculate once

the radio interface rate that represents the user that a upper TTI is corresponding.

Can find out, this mode has been introduced the information of all TTI before, therefore can reflect better user's radio interface rate situation; And this mode only need be used the data volume of transmission in current TTI, without recording the data volume of transmitting in other TTI, therefore can save the occupancy of memory headroom.But also can there is some problems in actual applications in this mode, as: 1) increase user's face propagation delay time; 2) easily the poor user of channel circumstance is too much dispatched, thereby drag down the throughput of community.

The analysis of causes that above-mentioned 2 problems produce is as follows.

At present, up and the high speed uplink packet access (HSUPA of HSPA+ system, High Speed UplinkPacket Access) system is the same, adopt 4 mixed automatic retransfer request (HARQ, Hybrid AutomaticRepeat Request) process, descending the same with high speed downlink packet access (HSDPA, High Speed DownlinkPacket Access) system, adopt 8 HARQ processes.This means, for the transmission of up direction, from being dispatched to the time that feedback message needs 4 TTI altogether that receives, for the transmission of down direction, from being dispatched to the time that feedback message needs 8 TTI altogether that receives.Described feedback message refers to ACK or NACK, and ACK represents transmission success, and NACK represents bust this.

In above-mentioned formula (2), the data volume of transmission in the current TTI of using when calculating R (t), refer to the data volume of transmission success, obviously, only after receiving feedback message, just can know which transfer of data success, correspondingly, could calculate according to mode shown in formula (2) user's radio interface rate.

Fig. 1 is high speed descending sharing channel (HS-DSCH, High Speed Downlink Shared Channel) the downlink transfer sequential schematic diagram that the time slot proportion of existing HSPA+ system is 3:3.As shown in Figure 1, expressed from N to N+7 totally 8 TTI, and the position of having expressed each time slot in each TTI; Conventionally, the 3rd, 4,5 time slots in each TTI are for uplink, and the 6th, 7,8 time slots are for downlink transfer; In 8 TTI shown in Fig. 1, NodeB has the chance of 8 scheduling.

If according to mode shown in formula (2), after receiving feedback message, just calculate user's radio interface rate, so, as shown in Figure 1, from being dispatched to the time that feedback message needs 8 TTI altogether that receives, if the channel circumstance of other user in same community is not too large variation during this period of time, from the 1st TTI shown in Fig. 1, dispatch a user so, being assumed to be user A starts, 7 TTI subsequently also will be at dispatched users A, unless it is complete that the buffer memory of user A is scheduled, otherwise the scheduling for user A will at least continue 8 TTI, be that scheduling interval is excessive, thereby cause user's face propagation delay time of other user to increase, that is to say, even if other user has data to need transmission, also after needing at least to wait until 8 TTI, be just likely scheduled.

In addition, in PF dispatching algorithm, if there is a user that link Block Error Rate is very high in community, described link Block Error Rate is very high may be caused by following reason: channel circumstance is bad, in cell edge, among deep fade, be subject to compared with strong jamming etc., if calculate user's radio interface rate according to the data volume of transmission success according to mode shown in formula (2), so for guaranteeing the fairness of the throughput between each user, NodeB can dispatch the user that this link Block Error Rate is very high repeatedly, thereby causes the throughput of whole community to decline.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of user's radio interface rate acquisition methods, can reduce user's face propagation delay time and improve cell throughout.

Another object of the present invention is to provide a kind of user's radio interface rate acquisition device, can reduce user's face propagation delay time and improve cell throughout.

For achieving the above object, technical scheme of the present invention is achieved in that

User's radio interface rate acquisition methods, comprising:

For arbitrary user A, determine the data volume that allows user A transmission in current transmission time interval TTI;

According to the data volume that allows user A transmission in described current TTI, according to smothing filtering mode, determine the radio interface rate of the user A that current TTI is corresponding.

User's radio interface rate acquisition device, comprising:

The first determining unit, for for arbitrary user A, determines the data volume that allows user A transmission in current transmission time interval TTI;

The second determining unit, for according to being received from the data volume that allows user A to transmit in the described current TTI of described the first determining unit, determines the radio interface rate of the user A that current TTI is corresponding according to smothing filtering mode.

Visible, adopt technical scheme of the present invention, allow the data volume of user A transmission in determining current TTI after, according to the data volume that allows user A transmission in current TTI, according to smothing filtering mode, calculate the radio interface rate of user A, rather than as prior art, wait until and receive after feedback message, according to the data volume of transmission success, calculate again, thereby avoided scheduling interval problem excessive and that the very high user of link Block Error Rate is too much dispatched, and then reduced user's face propagation delay time and improved cell throughout; And scheme of the present invention implements simple and convenient, be convenient to popularize.

Accompanying drawing explanation

Fig. 1 is the HS-DSCH downlink transfer sequential schematic diagram that the time slot proportion of existing HSPA+ system is 3: 3.

Fig. 2 is the flow chart of the inventive method embodiment.

Fig. 3 is the composition structural representation of apparatus of the present invention embodiment.

Fig. 4 is than existing smothing filtering mode, adopts the improvement situation simulated effect schematic diagram to scheduling interval after scheme of the present invention.

Fig. 5 is than existing smothing filtering mode, adopts the improvement situation simulated effect schematic diagram to cell throughout after scheme of the present invention.

Embodiment

For problems of the prior art, in the present invention, propose a kind of user's radio interface rate and obtain scheme, can reduce user's face propagation delay time and improve cell throughout.

For make technical scheme of the present invention clearer, understand, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.

Fig. 2 is the flow chart of the inventive method embodiment.As shown in Figure 2, comprise the following steps:

Step 21: for arbitrary user A, determine the data volume that allows user A transmission in current TTI.

In how to confirm current TTI, allowing the data volume of user A transmission is prior art, repeats no more.

Step 22: according to the data volume that allows user A transmission in current TTI, determine the radio interface rate of the user A that current TTI is corresponding according to smothing filtering mode.

In this step, according to smothing filtering mode, calculate the radio interface rate of user A corresponding to current TTI

wherein,

the radio interface rate that represents the user A that previous T TI is corresponding; A is filter factor, and concrete value can be decided according to the actual requirements; R (t) represents momentary rate, with allowing the data volume of user A transmission to obtain divided by TTI in current TTI, if allow the data volume of user A transmission in current TTI, is 0, and user A is dispatched, and the value of R (t) is 0.

Each TTI all needs to carry out flow process shown in a Fig. 2, and each TTI all needs to upgrade the radio interface rate of a user A.How according to the radio interface rate of the user A calculating, to carry out subsequent treatment is prior art, repeats no more.

Can find out, the mode of radio interface rate and the main distinction of existing smothing filtering mode of calculating user A of the present invention are: R (t) calculates according to the data volume of transmission success, but according to allowing the data volume of user A transmission to calculate in current TTI, the data volume size of the MAC-ehs packet sending according to NodeB (no matter being first biography or re-transmission) is calculated, like this, when the MAC of NodeB layer scheduler module dispatched user A, and distributed transfer resource, determined this transmission can/allow the data volume of transmission (due to hardware handles time delay and physical layer algorithm process time delay, may also really not eat dishes without rice or wine to transfer out) afterwards, can calculate the radio interface rate of user A, without by the time receiving feedback message.

That is to say, the feedback message no matter receiving is in the future ACK or NACK, its corresponding data all can participate in the calculating of radio interface rate of user A, because the angle from resource occupation, whether successfully no matter transmit, all taken interface-free resources, making so in the calculating of its radio interface rate that participates in user A is the true reflection to real resource Expenditure Levels.

Based on said method, Fig. 3 is the composition structural representation of apparatus of the present invention embodiment.As shown in Figure 3, comprising:

The first determining unit 31, for for arbitrary user A, determines the data volume that allows user A transmission in current TTI;

The second determining unit 32, for according to being received from the data volume that allows user A to transmit in the current TTI of the first determining unit 31, determines the radio interface rate of the user A that current TTI is corresponding according to smothing filtering mode.

Wherein, in the second determining unit 32, can specifically comprise:

Receive subelement 321, for receiving the data volume that allows user A transmission in the current TTI from the first determining unit 31;

Computation subunit 322, for calculating

wherein,

the radio interface rate that represents the user A that current TTI is corresponding; the radio interface rate that represents the user A that previous T TI is corresponding; A represents filter factor; R (t) represents momentary rate, with allowing the data volume of user A transmission to obtain divided by TTI in current TTI.

The specific works flow process of Fig. 3 shown device embodiment please refer to the respective description in embodiment of the method shown in Fig. 2, repeats no more herein.

In a word, adopt technical scheme of the present invention, can avoid scheduling interval excessive and the very high user of link Block Error Rate is too much dispatched, thereby reduced user's face propagation delay time and improved cell throughout.

Fig. 4 is than existing smothing filtering mode, adopts the improvement situation simulated effect schematic diagram to scheduling interval after scheme of the present invention.As shown in Figure 4, suppose to co-exist in 5 users, all on the position apart from 350 meters of NodeB (radius of society is 500 meters), transfixion; Can find out, if adopt existing smothing filtering mode, scheduling interval is 12 TTI, and adopt after scheme of the present invention, will be 4 TTI.

Fig. 5 is than existing smothing filtering mode, adopts the improvement situation simulated effect schematic diagram to cell throughout after scheme of the present invention.As shown in Figure 5, suppose to co-exist in 5 users, on apart from 100 meters of NodeB, the position of 200 meters, 300 meters, 400 meters, 500 meters (radius of society is 500 meters) respectively, transfixion; Adopt after scheme of the present invention, for the higher user of link Block Error Rate, can reduce its scheduling times, then the good user of other channel circumstance of scheduling, by the time after taking a turn for the better, again it is dispatched the user's that described link Block Error Rate is higher channel circumstance, thereby improved other user's throughput, and then improved cell throughout.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (2)

1. user's radio interface rate acquisition methods, is characterized in that, the method comprises:

For arbitrary user A, determine the data volume that allows user A transmission in current transmission time interval TTI;

According to the data volume that allows user A transmission in described current TTI, according to smothing filtering mode, determine the radio interface rate of the user A that current TTI is corresponding;

Wherein, describedly according to smothing filtering mode, determine that the radio interface rate of the user A that current TTI is corresponding comprises:

Calculate $\stackrel{\‾}{R}\left(t\right)=(1-a)\×\stackrel{\‾}{R}(t-1)+a\×R\left(t\right);$

Wherein, described in

the radio interface rate that represents the user A that current TTI is corresponding; Described

the radio interface rate that represents the user A that previous T TI is corresponding; Described a represents filter factor; Described R (t) represents momentary rate, with allowing the data volume of user A transmission to obtain divided by TTI in current TTI.

2. user's radio interface rate acquisition device, is characterized in that, comprising:

The first determining unit, for for arbitrary user A, determines the data volume that allows user A transmission in current transmission time interval TTI;

The second determining unit, for according to being received from the data volume that allows user A to transmit in the described current TTI of described the first determining unit, determines the radio interface rate of the user A that current TTI is corresponding according to smothing filtering mode;

Wherein, described the second determining unit comprises:

Receive subelement, for receiving the data volume that allows user A transmission in the described current TTI from described the first determining unit;

Computation subunit, for calculating

wherein, described in the radio interface rate that represents the user A that current TTI is corresponding; Described

the radio interface rate that represents the user A that previous T TI is corresponding; Described a represents filter factor; Described R (t) represents momentary rate, with allowing the data volume of user A transmission to obtain divided by TTI in current TTI.

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