CN102802213B - Method for improving scheduling efficiency - Google Patents
Method for improving scheduling efficiency Download PDFInfo
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- CN102802213B CN102802213B CN201110138712.6A CN201110138712A CN102802213B CN 102802213 B CN102802213 B CN 102802213B CN 201110138712 A CN201110138712 A CN 201110138712A CN 102802213 B CN102802213 B CN 102802213B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000013507 mapping Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of method improving dispatching efficiency.
Background technology
In TD-SCDMA system, when carrying out downlink wave beam (DL Beamforming) figuration, need the calculating according to utilizing uplink channel estimation result to carry out downlink forming vector.When the uplink channel information feedback for carrying out uplink channel estimation is more timely, down beam shaping is more accurate.But in existing system, carry out may there is larger interval between the moment of down beam shaping and the last moment obtaining uplink channel estimation result, such as, in time-division multiple address system, ascending pilot frequency for carrying out uplink channel estimation can not send continuously, and downlink data then needs continuous transmission.Like this, the uplink channel estimation result utilized when carrying out down beam shaping, may not the current channel conditions of accurate response, that is, this uplink channel estimation the possibility of result is out-of-date, thus affects the accuracy of the down beam shaping carried out based on this uplink channel estimation result.
Such as, during TD-SCDMA use HSPA (high speed data transfer), need configuration with the adjoint channel of dedicated channel (DPCH) conduct for carrying Access Network signaling.When DPCH adopts frame to divide multiplexing, in the middle of twice DPCH sends, have interruption.Such as, when DPCH frame divides re-use to be 4, DPCH can send 20ms, middle interruption 60ms; Send without DPCH between the rest periods.For the down high speed shared service channel (HS-DSCH) of HSPA, when up DPCH sends, the channel information that HS-DSCH utilizes last up DPCH subframe to send carries out down beam shaping accurately; In the subframe that DPCH does not send, HS-DSCH can only carry out inaccurate down beam shaping by the channel estimating that the last time sends up DPCH subframe, thus affects the efficiency of transmission of HS-DSCH.According to simulation result, when up DPCH feedback is 5ms with HS-DSCH propagation delay time, HS-DSCH wave beam forming loss 1 ~ 2dB under walking 3 kilometers of channels; ; When up DPCH feedback is 40ms with HS-DSCH propagation delay time, under walking 3 kilometers of channels, HS-DSCH wave beam forming loses about 4dB.
And current dispatching algorithm is as direct proportion fair scheduling algorithm, maximum signal to noise ratio dispatching algorithm, need to dispatch based on parameters such as current user data-throughput, signal to noise ratios.The acquisition of these parameters needs to obtain based on the uplink channel information of user feedback, like this, if the uplink channel information of user feedback is not in time, and will the accuracy of influential system scheduling.In addition, as previously mentioned, if the uplink channel information of user feedback not in time, the accuracy of down beam shaping will be affected, down beam shaping inaccurate, can cause the reduction of user throughput, therefore, also can reduce the efficiency of the system call of carrying out based on data throughout further.
In sum, user feedback uplink channel information system call can be caused not in time inaccurate, simultaneously also can affect the inaccurate of down beam shaping, reduce system call efficiency further.At present, a kind of method that effectively can overcome the problems referred to above is not yet proposed.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method improving dispatching efficiency.
In order to achieve the above object, the technical scheme that the present invention proposes is:
Improve a method for dispatching efficiency, the method comprises the following steps:
A, at current scheduling subframe n, treat scheduling user's set UE for each
i, system determination current time obtains this UE with the last
ithe time interval d of the uplink channel information of feedback
i;
B, for each UE
i, according to described time interval d
iwith the mapping relations of the time interval of presetting with scheduling corrected parameter, determine this UE
ischeduling corrected parameter α
i;
C, according to described scheduling corrected parameter α
i, the scheduling formula of current scheduling algorithm is revised, and dispatches according to revised scheduling formula;
Wherein,
When described dispatching algorithm is direct proportion fair scheduling algorithm, described revised scheduling formula is:
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 treating scheduling user's set, r
in () is UE
iin the momentary rate of scheduling subframe n, R
in () is UE
iin the actual transfer rate of scheduling subframe n;
When described dispatching algorithm is maximum signal to noise ratio dispatching algorithm, described revised scheduling formula is:
wherein, SIR
ifor UE
icurrent signal to noise ratio.
In sum, the method of the raising dispatching efficiency that the present invention proposes, when dispatching, current and the last time is utilized to obtain the interval in uplink channel information estimated code moment, the current scheduling corrected parameter respectively treating dispatched users is set, utilize scheduling corrected parameter the scheduling formula that current scheduling adopts is revised, thus can compensate user feedback uplink channel information not in time on the impact of dispatching efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: when dispatching, and utilizes the current time difference obtaining the uplink channel information estimated code moment with the last time, arranges the current scheduling corrected parameter α respectively treating dispatched users
i, utilize this α
ithe scheduling formula that current scheduling adopts is revised, inaccurate with what compensate because of the scheduling parameter caused by feedback delay, thus the dispatching efficiency of current scheduling algorithm can be guaranteed.
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.As shown in Figure 1, this embodiment mainly comprises the following steps:
Step 101, at current scheduling subframe n, treat scheduling user's set UE for each
i, system determination current time obtains this UE with the last
ithe time interval d of the uplink channel information of feedback
i.
Step 102, for each UE
i, according to described time interval d
iwith the mapping relations of the time interval of presetting with scheduling corrected parameter, determine this UE
ischeduling corrected parameter α
i.
Here, described mapping relations obtain according to current wave beam forming loss target, usually meet: the scheduling corrected parameter that interval is corresponding is for a long time less than or equal to scheduling corrected parameter corresponding to short time interval, to utilize scheduling corrected parameter to carry out scheduling punishment to the UE at long-time interval, the UE making the time interval of feeding back uplink channel information short is easily dispatched, so can to guarantee to be scheduled the wave beam forming quality of UE, to improve the dispatching efficiency of system.
Particularly, α
ican obtain according to a predetermined threshold value, namely the described time interval with the mapping relations of scheduling corrected parameter can be:
Work as d
iwhen being less than or equal to predetermined threshold value D, α
i=1;
Work as d
iwhen being greater than described threshold value D, 0 < α
i<1.
For described threshold value D, the appropriate value of default wave beam forming loss target can be met by emulation.
Concrete, when user's collocating uplink is with 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 with dedicated channel DPCH, if the time interval d of the last up DPCH delivery time and current time
iwhen being greater than parameter preset D, 0 < α
i<1.
Further, described α
ithe mapping table can also preset according to one obtains, and namely step 102 is specially:
For each UE
i, according to described time interval d
i, the time interval that inquiry is preset and the mapping table of scheduling corrected parameter, obtain described d
icorresponding α
i, wherein, the scheduling corrected parameter value in described mapping table corresponding to each feedback delay value, the wave beam forming loss target according to presetting is obtained by emulation or drive test.
Here, in advance for each feedback delay value, be met the scheduling corrected parameter value of default wave beam forming loss target by emulation, thus obtain the described time interval and the mapping table dispatching corrected parameter.
Step 103, according to described scheduling corrected parameter α
i, the scheduling formula of current scheduling algorithm is revised, and dispatches according to revised scheduling formula.
Particularly, when current adopted dispatching algorithm is direct proportion fair scheduling algorithm, described revised scheduling formula is:
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 treating scheduling user's set, r
in () is UE
iin the momentary rate of scheduling subframe n, R
in () is UE
iin the actual transfer rate of scheduling subframe n.
When current adopted dispatching algorithm is maximum signal to noise ratio dispatching algorithm, described revised scheduling formula is:
wherein, SIR
ifor UE
icurrent signal to noise ratio.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. improve a method for dispatching efficiency, it is characterized in that, the method comprises the following steps:
A, at current scheduling subframe n, treat scheduling user's set UE for each
i, system determination current time obtains this UE with the last
ithe time interval d of the uplink channel information of feedback
i;
B, for each UE
i, according to described time interval d
iwith the mapping relations of the time interval of presetting with scheduling corrected parameter, determine this UE
ischeduling corrected parameter α
i;
C, according to described scheduling corrected parameter α
i, the scheduling formula of current scheduling algorithm is revised, and dispatches according to revised scheduling formula;
Wherein,
When described dispatching algorithm is direct proportion fair scheduling algorithm, described revised scheduling formula is:
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 treating scheduling user's set, r
in () is UE
iin the momentary rate of scheduling subframe n, R
in () is UE
iin the actual transfer rate of scheduling subframe n;
When described dispatching algorithm is maximum signal to noise ratio dispatching algorithm, described revised scheduling formula is:
2. method according to claim 1, is characterized in that, the time interval described in step b with the mapping relations of scheduling corrected parameter is:
Work as d
iwhen being less than or equal to predetermined threshold value D, α
i=1;
Work as d
iwhen being greater than described threshold value D, 0 < α
i< 1.
3. method according to claim 1, is characterized in that, described step b is:
For each UE
i, according to described time interval d
i, the time interval that inquiry is preset and the mapping table of scheduling corrected parameter, obtain described d
icorresponding α
i, wherein, the scheduling corrected parameter value in described mapping table corresponding to each feedback delay value, the wave beam forming loss target according to presetting is obtained by emulation.
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| CN201110138712.6A CN102802213B (en) | 2011-05-26 | 2011-05-26 | Method for improving scheduling efficiency |
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| CN104219770B (en) * | 2013-05-31 | 2017-11-14 | 中国电信股份有限公司 | LTE system downlink dispatching method and device |
| CN106550476A (en) * | 2017-01-17 | 2017-03-29 | 北京佰才邦技术有限公司 | A kind of resource regulating method and base station and terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605362A (en) * | 2008-06-09 | 2009-12-16 | 日本电气株式会社 | Wireless communication system, base station, dispatching method and program |
| CN101754387A (en) * | 2008-12-12 | 2010-06-23 | 株式会社Ntt都科摩 | Method for scheduling resources in wireless communication system and base station |
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| US7046678B2 (en) * | 2000-02-18 | 2006-05-16 | At & T Corp. | Channel efficiency based packet scheduling for interactive data in cellular networks |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605362A (en) * | 2008-06-09 | 2009-12-16 | 日本电气株式会社 | Wireless communication system, base station, dispatching method and program |
| CN101754387A (en) * | 2008-12-12 | 2010-06-23 | 株式会社Ntt都科摩 | Method for scheduling resources in wireless communication system and base station |
Non-Patent Citations (1)
| Title |
|---|
| An enhanced Proportional Fair algorithm to provide QoS over a shared wireless link;Foronda, A.等;《IEEE/IEE Electronic Library》;20081009;全文 * |
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