CN102802213A - Method for improving scheduling efficiency - Google Patents

Abstract

The invention provides a method for improving scheduling efficiency. In the scheduling process, by using an interval between the current moment and a moment at which an estimated code of uplink channel information is acquired last time, scheduling correction parameters of users to be scheduled currently are set, and a scheduling formula used by the current scheduling process is corrected by using the scheduling correction parameters, so that influences on the scheduling efficiency, which are generated because the uplink channel information is fed back by the users untimely, can be reduced.

Description

A kind of method that improves dispatching efficiency

Technical field

The present invention relates to mobile communication technology, particularly relate to a kind of method that improves dispatching efficiency.

Background technology

In the TD-SCDMA system, when carrying out downlink wave beam (DL Beamforming) figuration, need be according to utilizing the uplink channel estimation result to carry out the calculating of downlink forming vector.Timely more when the uplink channel information feedback that is used to carry out uplink channel estimation, down beam shaping is accurate more.Yet in existing system; The moment and the last time of carrying out down beam shaping obtains possibly have bigger interval between moment of uplink channel estimation result; For example; In the time-division multiple address system, the ascending pilot frequency that is used to carry out uplink channel estimation can not send continuously, and downlink data then needs transmission continuously.Like this; The uplink channel estimation result who is utilized when carrying out down beam shaping may not the current channel conditions of accurate response, that is to say; This uplink channel estimation the possibility of result is out-of-date, thereby influences the accuracy of the down beam shaping that is carried out based on this uplink channel estimation result.

For example, when TD-SCDMA uses HSPA (high speed data transfer), need configuration to follow dedicated channel (DPCH) as following channel to be used to carry the Access Network signaling.DPCH adopts frame to divide when multiplexing, has interruption in the middle of twice DPCH sends.For example, DPCH frame branch reuse is 4 o'clock, and DPCH can send 20ms, and 60ms is interrupted in the centre; No DPCH sends between the rest periods.For the down high speed shared service channel (HS-DSCH) of HSPA, when up DPCH sent, the channel information that HS-DSCH utilizes last up DPCH subframe to send carried out down beam shaping accurately; In the subframe that DPCH does not send, HS-DSCH can only carry out inaccurate down beam shaping with the channel estimating that the last time is sent up DPCH subframe, thereby influences the efficiency of transmission of HS-DSCH.Based on simulation result, when up DPCH feedback is 5ms with the HS-DSCH propagation delay time, HS-DSCH wave beam forming loss 1～2dB under 3 kilometers channels of walking; When up DPCH feedback is 40ms with the HS-DSCH propagation delay time, the about 4dB of HS-DSCH wave beam forming loss under 3 kilometers channels of walking.

And present dispatching algorithm such as direct proportion fair scheduling algorithm, maximum signal to noise ratio dispatching algorithm need be dispatched based on parameters such as current user data-throughput, signal to noise ratios.The acquisition of these parameters need obtain based on the uplink channel information of user feedback, like this, if the uplink channel information of user feedback is untimely, will influence the accuracy of system call.In addition, as previously mentioned, if the uplink channel information of user feedback is untimely; Will influence the accuracy of down beam shaping; Therefore the inaccurate reduction that then can cause user throughput of down beam shaping, also can further reduce the efficient of the system call of carrying out based on data throughout.

In sum, the untimely meeting of user feedback uplink channel information causes system call inaccurate, also can influence the inaccurate of down beam shaping simultaneously, further reduces system call efficient.At present, a kind of method that can effectively overcome the problems referred to above is not proposed as yet.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method method that improves dispatching efficiency.

In order to achieve the above object, the technical scheme of the present invention's proposition is:

A kind of method that improves dispatching efficiency, this method may further comprise the steps:

A, at current scheduling subframe n, treat scheduling user's set UE for each _i, system confirms current time and the last this UE of acquisition _iThe time interval d of the uplink channel information of feedback _i

B, for each UE _i, according to said time interval d _iWith the preset time interval and the mapping relations of scheduling corrected parameter, confirm this UE _iScheduling corrected parameter α _i

C, according to said scheduling corrected parameter α _i, the scheduling formula of current scheduling algorithm is revised, and is dispatched according to revised scheduling formula;

Wherein,

When said dispatching algorithm was the direct proportion fair scheduling algorithm, said revised scheduling formula was: Wherein, i is the numbering of subscriber equipment, and k is the numbering of determined scheduling user's set, and K is the current quantity of treating scheduling user's set, r _i(n) be UE _iAt the momentary rate of scheduling subframe n, R _i(n) be UE _iActual transfer rate at scheduling subframe n;

When said dispatching algorithm was the maximum signal to noise ratio dispatching algorithm, said revised scheduling formula was:

$k=\underset{i=1,...,K}{\mathrm{Arg}\mathrm{Max}}\{{\mathrm{\α}}_i\×{\mathrm{SIR}}_i\},$ Wherein, SIR _iBe UE _iCurrent signal to noise ratio.

In sum; The method of the raising dispatching efficiency that the present invention proposes; When scheduling, utilize the current and the last uplink channel information estimated code interval constantly that obtains, the current scheduling corrected parameter of respectively treating dispatched users is set; Utilize the scheduling corrected parameter that the scheduling formula that current scheduling adopted is revised, thereby can compensate the untimely influence of user feedback uplink channel information dispatching efficiency.

Description of drawings

Fig. 1 is the schematic flow sheet of the embodiment of the invention one.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, the present invention is done to describe in detail further below in conjunction with accompanying drawing and specific embodiment.

Core concept of the present invention is: when scheduling, utilize the current and the last uplink channel information estimated code time difference constantly that obtains, the current scheduling corrected parameter α that respectively treats dispatched users is set _i, utilize this α _iScheduling formula to current scheduling adopts is revised, and with compensation inaccurate because of the scheduling parameter due to the feedback delay, thereby can guarantee the dispatching efficiency of current scheduling algorithm.

Fig. 1 is the schematic flow sheet of the embodiment of the invention one.As shown in Figure 1, this embodiment mainly may further comprise the steps:

Step 101, at current scheduling subframe n, treat scheduling user's set UE for each _i, system confirms current time and the last this UE of acquisition _iThe time interval d of the uplink channel information of feedback _i

Step 102, for each UE _i, according to said time interval d _iWith the preset time interval and the mapping relations of scheduling corrected parameter, confirm this UE _iScheduling corrected parameter α _i

Here; Said mapping relations obtain according to current wave beam forming loss target; Usually satisfy: long-time corresponding at interval scheduling corrected parameter is less than or equal to the corresponding scheduling corrected parameter of short time interval, so that utilize the scheduling corrected parameter that the UE at long-time interval is dispatched punishment, makes the short UE of the time interval of feeding back uplink channel information obtain scheduling easily; So can guarantee the to be scheduled wave beam forming quality of UE improves the dispatching efficiency of system.

Particularly, α _iCan obtain according to a predetermined threshold value, promptly the said time interval with the scheduling corrected parameter mapping relations can for:

Work as d _iWhen being less than or equal to predetermined threshold value D, α _i=1;

Work as d _iDuring greater than said threshold value D, 0＜α _i＜1.

For said threshold value D, can be met the suitable value of preset wave beam forming loss target through emulation.

Concrete, when user's collocating uplink is followed dedicated channel DPCH, if the time interval d of the last up DPCH delivery time and current time _iWhen being less than or equal to parameter preset D, α _i=1;

Concrete, when user's collocating uplink is followed dedicated channel DPCH, if the time interval d of the last up DPCH delivery time and current time _iDuring greater than parameter preset D, α _i=1.

Further, said α _iCan also obtain according to a preset mapping table, promptly step 102 is specially:

For each UE _i, according to said time interval d _i, the time interval and the mapping table of dispatching corrected parameter that inquiry is preset, obtain said d _iCorresponding α _i, wherein, the pairing scheduling corrected parameter of each feedback delay value value in the said mapping table obtains through emulation or drive test according to preset wave beam forming loss target.

Here, in advance for each feedback delay value, be met the scheduling corrected parameter value of preset wave beam forming loss target through emulation, thereby obtain the said time interval and the mapping table of dispatching corrected parameter.

Step 103, according to said scheduling corrected parameter α _i, the scheduling formula of current scheduling algorithm is revised, and is dispatched according to revised scheduling formula.

Particularly, when the current dispatching algorithm that adopts was the direct proportion fair scheduling algorithm, said revised scheduling formula was:

Wherein, i is the numbering of subscriber equipment, and k is the numbering of determined scheduling user's set, and K is the current quantity of treating scheduling user's set, r _i(n) be UE _iAt the momentary rate of scheduling subframe n, R _i(n) be UE _iActual transfer rate at scheduling subframe n.

When the current dispatching algorithm that adopts was the maximum signal to noise ratio dispatching algorithm, said revised scheduling formula was:

$k=\underset{i=1,...,K}{\mathrm{Arg}\mathrm{Max}}\{{\mathrm{\α}}_i\×{\mathrm{SIR}}_i\},$ Wherein, SIR _iBe UE _iCurrent signal to noise ratio.

In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a method that improves dispatching efficiency is characterized in that, this method may further comprise the steps:

A, at current scheduling subframe n, treat scheduling user's set UE for each _i, system confirms current time and the last this UE of acquisition _iThe time interval d of the uplink channel information of feedback _i

B, for each UE _i, according to said time interval d _iWith the preset time interval and the mapping relations of scheduling corrected parameter, confirm this UE _iScheduling corrected parameter α _i

C, according to said scheduling corrected parameter α _i, the scheduling formula of current scheduling algorithm is revised, and is dispatched according to revised scheduling formula;

Wherein,

When said dispatching algorithm was the direct proportion fair scheduling algorithm, said revised scheduling formula was:

Wherein, i is the numbering of subscriber equipment, and k is the numbering of determined scheduling user's set, and K is the current quantity of treating scheduling user's set, r _i(n) be UE _iAt the momentary rate of scheduling subframe n, R _i(n) be UE _iActual transfer rate at scheduling subframe n;

When said dispatching algorithm was the maximum signal to noise ratio dispatching algorithm, said revised scheduling formula was:

$k=\underset{i=1,...,K}{\mathrm{Arg}\mathrm{Max}}\{{\mathrm{\α}}_i\×{\mathrm{SIR}}_i\},$ Wherein, SIR _iBe UE _iCurrent signal to noise ratio.

2. method according to claim 1 is characterized in that, the mapping relations of the time interval described in the step b with the scheduling corrected parameter are:

Work as d _iWhen being less than or equal to predetermined threshold value D, α _i=1;

Work as d _iDuring greater than said threshold value D, 0＜α _i＜1.

3. method according to claim 1 is characterized in that, said step b is:

For each UE _i, according to said time interval d _i, the time interval and the mapping table of dispatching corrected parameter that inquiry is preset, obtain said d _iCorresponding α _i, wherein, the pairing scheduling corrected parameter of each feedback delay value value in the said mapping table obtains through emulation according to preset wave beam forming loss target.

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