CN103582148A - Method and device for adjusting scheduling strategy and base station - Google Patents

Method and device for adjusting scheduling strategy and base station Download PDF

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Publication number
CN103582148A
CN103582148A CN201210284655.7A CN201210284655A CN103582148A CN 103582148 A CN103582148 A CN 103582148A CN 201210284655 A CN201210284655 A CN 201210284655A CN 103582148 A CN103582148 A CN 103582148A
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channel
variation
intensity
scheduling strategy
obtaining
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孙国平
王国争
宋廷山
文安平
孙毅
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2013/080933 priority patent/WO2014023225A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method and device for adjusting a scheduling strategy and a base station. The method includes the steps of obtaining the change degree of a channel, and adjusting the scheduling strategy of the base station according to the obtained change degree, wherein the scheduling strategy is used for indicating the sending velocity of downlink data and the matching degree of a downlink channel. According to the technical scheme, the technical problem that in a related technology, the change of the channel can not be taken into consideration by using the uniform scheduling strategy and other problems are solved, and therefore the downlink handling capacity is improved.

Description

The method of adjustment of scheduling strategy and device, base station
Technical field
The present invention relates to the communications field, in particular to a kind of method of adjustment of scheduling strategy and device, base station.
Background technology
High speed downlink packet access technology (High Speed Downlink Packet Access, referred to as HSDPA) and follow-up evolution HSPA+ in a key technology be link adaptation techniques, user is according to channel quality indication (the Channel Quality Indicator of terminal to report, referred to as CQI) determine and use Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, referred to as QPSK), quaternary quadrature amplitude modulation (Quadrature Amplitude Modulation, referred to as QAM) (16QAM) or octal system QAM(64QAM) modulation, in order to reduce CQI measure error and the impact of system loopback delay on performance, certain adjustment has been done in base station, because channel exists fluctuation, if unified, take identical adjustment strategy, probably make to adjust the variation that does not catch up with channel, thereby cause the decline of throughput.
For the problems referred to above in correlation technique, effective solution is not yet proposed at present.
Summary of the invention
In correlation technique, adopt unified adjustment strategy can not giving consideration to channel variation etc. technical problem, the invention provides a kind of method of adjustment of scheduling strategy and device, base station, at least to address the above problem.
According to an aspect of the present invention, provide a kind of method of adjustment of scheduling strategy, having comprised: the intensity of variation that obtains channel; According to the above-mentioned intensity of variation obtaining, the scheduling strategy of base station is adjusted, wherein, scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
The intensity of variation that obtains channel, comprising: by the intensity of variation of uplink demodulation information estimator channel.
It is one of following that above-mentioned uplink demodulation message comprises: the energy of the pilot signal of the channel quality indicator (CQI) that subscriber equipment (UE) reports, the spread spectrum of uplink receiving signal, uplink channel estimation value, uplink receiving.
Intensity of variation by uplink demodulation information estimator channel, comprising: obtain the variance of uplink demodulation information or the absolute difference of consecutive value; According to the intensity of variation of variance or absolute difference estimation channel.
According to the intensity of variation obtaining, the scheduling strategy of base station is adjusted, being comprised: according to the intensity of variation obtaining, adopt corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used; And/or according to the transmitting power of the intensity of variation adjustment downlink data obtaining.
After the scheduling strategy of base station being adjusted according to the intensity of variation obtaining, comprising: the scheduling strategy after carry out adjusting, that obtains downlink data selects block size, code channel number, modulation system and transmitting power.
According to another aspect of the present invention, provide a kind of adjusting device of scheduling strategy, having comprised: acquisition module, for obtaining the intensity of variation of channel; Adjusting module, for the scheduling strategy of base station being adjusted according to the intensity of variation obtaining, wherein, scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
Above-mentioned acquisition module, for passing through the intensity of variation of uplink demodulation information estimator channel.
Above-mentioned acquisition module, for estimating the intensity of variation of channel: the energy of the pilot signal of the channel quality indicator (CQI) that subscriber equipment (UE) reports, the spread spectrum of uplink receiving signal, uplink channel estimation value, uplink receiving by one of following uplink demodulation message.
Above-mentioned acquisition module comprises: acquiring unit, for obtaining the variance of uplink demodulation information or the absolute difference of consecutive value; Estimation unit, for estimating the intensity of variation of channel according to variance or absolute difference.
Above-mentioned adjusting module, for adopting corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used according to the intensity of variation obtaining; And/or according to the transmitting power of the intensity of variation adjustment downlink data obtaining.
According to a further aspect of the invention, provide a kind of base station, having comprised: above-described device
By the present invention, adopt the technological means scheduling strategy of base station is adjusted according to the intensity of variation of channel, solved in correlation technique, adopt unified adjustment strategy can not giving consideration to channel variation etc. technical problem, thereby improved downlink throughput capacity.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the flow chart of the method for adjustment of the scheduling strategy of the embodiment of the present invention 1;
Fig. 2 is according to the structured flowchart of the adjusting device of the scheduling strategy of the embodiment of the present invention 1;
Fig. 3 is another structured flowchart according to the adjusting device of the scheduling strategy of the embodiment of the present invention 1;
Fig. 4 is according to the structured flowchart of the base station of the embodiment of the present invention 1;
Fig. 5 is the scheduling strategy method of adjustment schematic flow sheet according to the embodiment of the present invention 2;
Fig. 6 is according to the structural representation of the scheduling strategy adjusting device of the embodiment of the present invention 2;
Fig. 7 is the scheduling strategy method of adjustment flow chart according to the embodiment of the present invention 3;
Fig. 8 is the scheduling strategy method of adjustment flow chart according to the embodiment of the present invention 4.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
Consider in correlation technique, in the situation that there is fluctuation in channel, due to unified, take identical adjustment strategy, make to adjust the variation that does not catch up with channel, cause degradation technical problem under throughput, following examples provide the technical scheme of adjusting the scheduling strategy of base station according to channel variation degree.Specific as follows:
Embodiment 1
Fig. 1 is according to the flow chart of the method for adjustment of the scheduling strategy of the embodiment of the present invention 1.As shown in Figure 1, the method comprises:
Step S102, obtains the intensity of variation of channel;
Step S104, adjusts the scheduling strategy of base station according to the intensity of variation obtaining, and wherein, scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
Adopt above-mentioned treatment step, owing to can the scheduling strategy of base station being adjusted according to the intensity of variation of channel, therefore, can, so that the transmission rate of downlink data is mated more preferably with down channel, provide downlink throughput capacity.
The mode of obtaining channel variation degree has multiple, for example, can realize by receiving the channel variation degree that third party device send over, or obtain from this locality, for the latter, can pass through the intensity of variation of uplink demodulation information estimator channel.
It is one of following that above-mentioned uplink demodulation message includes but not limited to: the energy of the pilot signal of the spread spectrum of the CQI that UE reports, uplink receiving signal, uplink channel estimation value, uplink receiving.
When the intensity of variation by above-mentioned uplink demodulation information estimator channel, can realize by the absolute difference of variance or consecutive value, particularly, obtain the variance of uplink demodulation information or the absolute difference of consecutive value; According to the intensity of variation of the variance of obtaining or absolute difference estimation channel.
Above-mentioned steps S104 adjusts the scheduling strategy of base station according to the intensity of variation obtaining, and can comprise following processing procedure: according to the intensity of variation obtaining, adopt corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used; And/or, according to the transmitting power of the intensity of variation adjustment downlink data obtaining.
After the processing procedure of execution of step S104, the scheduling strategy after need to carry out adjusting, that obtains downlink data selects block size, code channel number, modulation system and transmitting power.Like this, the transmission rate that has just realized the downlink data that makes downlink data is mated with down channel, and then improves downlink throughput capacity.
A kind of adjusting device of scheduling strategy is also provided in the present embodiment, for realizing above-described embodiment and preferred implementation, had carried out repeating no more of explanation, below the module relating in this device has been described.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described device of following examples is preferably realized with software, hardware, or the realization of the combination of software and hardware also may and be conceived.Fig. 2 is according to the structured flowchart of the adjusting device of the scheduling strategy of the embodiment of the present invention 1.As shown in Figure 2, this device comprises:
Acquisition module 20, is connected to adjusting module 22, for obtaining the intensity of variation of channel;
Adjusting module 22, for the scheduling strategy of base station being adjusted according to the intensity of variation obtaining, wherein, scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
By the function of above-mentioned processing modules implement, can to the scheduling strategy of base station, adjust according to the intensity of variation of channel equally, therefore, can, so that the transmission rate of downlink data is mated more preferably with down channel, provide downlink throughput capacity
Corresponding with said method embodiment, above-mentioned acquisition module 20, also for passing through the intensity of variation of uplink demodulation information estimator channel.In such cases, this acquisition module 20, estimates the intensity of variation of channel: the energy of the pilot signal of the spread spectrum of the CQI that UE reports, uplink receiving signal, uplink channel estimation value, uplink receiving by one of following uplink demodulation message.
In a preferred implementation process of the present embodiment, as shown in Figure 3, above-mentioned acquisition module 20 comprises: acquiring unit 200, is connected to estimation unit 202, for obtaining the variance of uplink demodulation information or the absolute difference of consecutive value; Estimation unit 202, for estimating the intensity of variation of channel according to variance or absolute difference.
In the present embodiment, above-mentioned adjusting module 22, for adopting corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used according to the intensity of variation obtaining; And/or according to the transmitting power of the intensity of variation adjustment downlink data obtaining.
In the present embodiment, also provide a kind of base station, as shown in Figure 4, having comprised: the adjusting device of the scheduling strategy in above embodiment.Like this, base station can be adjusted according to the function of modules in said apparatus to the scheduling strategy of base station according to the intensity of variation of channel.
Embodiment 2
The present embodiment relates to the scheme of HSDPA and high-speed packet access evolution (HSPA+) system raising downlink throughput capacity.The object of the present embodiment is to adjust corresponding scheduling strategy according to channel variation degree, thereby improves downlink throughput capacity.The core concept of the present embodiment is, by the demodulating information of up history, estimates the intensity of variation of current channel, and adjusts corresponding scheduling strategy according to channel variation degree, thereby improve HSDPA terminal throughput.
As shown in Figure 5, the scheduling strategy method of adjustment of the present embodiment comprises:
Step S502, base station is by the intensity of variation of uplink demodulation information estimator channel, uplink demodulation information can be the CQI that UE reports, also can be the spread spectrum of uplink receiving signal, it can also be uplink channel estimation value, also can be the energy of the pilot signal of uplink receiving, by calculating the mould value (absolute value) of the variance of history value or the difference of consecutive value, estimate the degree of channel variation.
Step S504, base station is according to channel variation degree, adjust corresponding scheduling strategy, channel variation degree is different, corresponding scheduling strategy is different, such as can adopt different target BLER or different outer shrouds to control the CQI that the adjustment scheduling such as thresholding are used according to the degree size of channel variation, also can adjust descending transmitting power according to the degree of channel variation improves decoding performance etc.;
Step S506, operation dispatching strategy, obtains descending block size, code channel number, modulation system and the transmitting power selected;
The present embodiment also provides a kind of scheduling strategy adjusting device, for realizing said method.As shown in Figure 6, this device comprises with lower module:
Channel variation estimation module 60, be connected to adjusting module 62, for estimating the intensity of variation of current channel, calculate the mould value (absolute value) of the historical variance of uplink demodulation information or the difference of consecutive value, and estimate thus the degree of channel variation, uplink demodulation information can be the CQI that UE reports, and can be also the spread spectrum of uplink receiving signal, can also be uplink channel estimation value, can be also the energy of uplink receiving signal.；
Adjusting module 62, be connected to scheduler module 64, according to the degree of channel variation, adjust corresponding scheduling strategy, channel variation degree is different, corresponding scheduling strategy is different, such as can adopt different target BLER or different outer shrouds to control the CQI that thresholding adjustment scheduling is used according to the degree size of channel variation, also can adjust descending transmitting power according to the degree of channel variation and improve decoding performance etc.;
Scheduler module 64, carries out data dispatch according to corresponding scheduling strategy, and what obtain high speed descending sharing channel (High Speed Downlink Shared Channel, referred to as HS-DSCH) selects block size, code channel number, modulation system and transmitting power.
Embodiment 3
The CQI that the present embodiment reports according to UE estimates the intensity of variation of channel, and adopts different outer shrouds to control parameter according to the intensity of variation of channel.As shown in Figure 7, the scheduling strategy method of adjustment that the present embodiment provides comprises the following steps:
Step S702, base station decodes obtains the CQI that UE reports, and calculates the variance of historical CQI, establishes the quantity that L represents the historical CQI of record, is calculated as follows:
μ = 1 L Σ L CQI , σ = 1 L Σ L ( CQI - μ ) 2 , Wherein, μ represents CQI average, and σ represents variance;
Step S704, according to variance, adjusts the parameter that outer shroud is controlled, and carries out outer shroud control according to the ACK/NACK of UE feedback, and parameter can be the thresholding controlled of outer shroud or target BLER etc.
A. the thresholding that outer shroud is controlled, supposes that the acquiescence thresholding that outer shroud is controlled is [M, N], as follows according to variance adjustment, [M ', N '] be the outer shroud control thresholding of actual use:
[M′，N′]＝[f(σ)*M，g(σ)xN]
Wherein f function and g function can be identical, also can be different.For example, can get as minor function:
f ( &sigma; ) = g ( &sigma; ) = 1 , if&sigma; < A 0 , else
Here A is thresholding, such as A=1, or 1.2 etc., now function is equivalent to a switch, is more than or equal to A and closes thresholding, directly uses the CQI that UE reports to dispatch, and is less than A and uses the outer shroud of acquiescence to control thresholding.Can adopt the adjustment outer shroud of continuously smooth to control thresholding, use corresponding f function and g function to adjust last outer shroud and control thresholding;
B. target BLER, is used different target BLER, BLER according to variance targetthe target BLER of acquiescence, BLER ' targetbe the actual target BLER using of scheduling, as follows:
BLER′ target＝BLER target*f(σ)
Wherein, f ( &sigma; ) = 0.5 , if&sigma; < A 1 , ifA &le; &sigma; < B 2 , else
Here A and B are thresholdings, when variance is smaller, show that channel is more stable, can adopt lower target BLER, when variance ratio is larger, show that channel variation is larger, need to adopt higher target BLER.
Step S706, carries out downlink data dispatching, according to the strategy of adjusting, carries out downlink data dispatching above, determines descending transmission block, code channel number, modulation system and transmitting power, carries out transfer of data.
Embodiment 4
As shown in Figure 8, the scheduling strategy method of adjustment that the present embodiment provides, comprising:
Step S802, obtains the channel estimation value of ascending pilot frequency, calculates the mould value (absolute value) of difference of the channel estimation value of adjacent twice, and L is the number of the channel estimation value ChannelEst of record.
&mu; = 1 L - 1 &Sigma; i = 1 L | ChanneEst i - ChanneEst i - 1 |
Step S804, adjusts CQI according to μ, and for the larger channel of fluctuation ratio, it is faster that CQI adjusts, and is conducive to adaptive channel faster, thereby improves throughput.
Step S806, the CQI according to after adjusting, carries out downlink data dispatching, obtains descending block size, code channel number, modulation system and the transmitting power selected.
In the present embodiment, except using variance, can also use the mould value (absolute value) of adjacent difference to judge the degree of channel variation, according to the fluctuation situation of channel, can adopt different adjustment strategies, except adjusting thresholding, step-length and the target BLER of outer shroud control, that can also adjust that CQI and scheduling select selects block size (TBsize), and down transmitting power etc., improve performance by these methods.
In the present embodiment, base station goes out channel variation degree by uplink demodulation information estimator, and adjusts corresponding scheduling strategy according to channel variation degree, makes the speed sending better mate wireless channel, thereby has improved descending throughput.
In another embodiment, also provide a kind of software, the technical scheme that this software is described for carrying out above-described embodiment and preferred implementation.
In another embodiment, also provide a kind of storage medium, stored above-mentioned software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (12)

1. a method of adjustment for scheduling strategy, is characterized in that, comprising:
Obtain the intensity of variation of channel;
According to the described intensity of variation obtaining, the scheduling strategy of base station is adjusted, wherein, described scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
2. method according to claim 1, is characterized in that, obtains the intensity of variation of channel, comprising:
By the intensity of variation of uplink demodulation information estimator channel.
3. method according to claim 2, is characterized in that, it is one of following that described uplink demodulation message comprises:
The energy of the pilot signal of the spread spectrum of the channel quality indicator (CQI) of reported by user equipment UE, uplink receiving signal, uplink channel estimation value, uplink receiving.
4. method according to claim 2, is characterized in that, the intensity of variation by uplink demodulation information estimator channel, comprising:
Obtain the variance of described uplink demodulation information or the absolute difference of consecutive value;
According to the intensity of variation of described variance or described absolute difference estimation channel.
5. method according to claim 1, is characterized in that, according to the described intensity of variation obtaining, the scheduling strategy of base station is adjusted, and comprising:
According to the described intensity of variation obtaining, adopt corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used; And/or
According to the described intensity of variation obtaining, adjust the transmitting power of downlink data.
6. according to the method described in claim 1 to 5 any one, it is characterized in that, after according to the described intensity of variation obtaining, the scheduling strategy of base station being adjusted, comprising:
Described scheduling strategy after carry out adjusting, that obtains downlink data selects block size, code channel number, modulation system and transmitting power.
7. an adjusting device for scheduling strategy, is characterized in that, comprising:
Acquisition module, for obtaining the intensity of variation of channel;
Adjusting module, for the scheduling strategy of base station being adjusted according to the described intensity of variation obtaining, wherein, described scheduling strategy is used to indicate the transmission rate of downlink data and the matching degree of down channel.
8. device according to claim 7, is characterized in that, described acquisition module, for passing through the intensity of variation of uplink demodulation information estimator channel.
9. device according to claim 8, is characterized in that, described acquisition module, for estimate the intensity of variation of channel by one of following uplink demodulation message:
The energy of the pilot signal of the spread spectrum of the channel quality indicator (CQI) of reported by user equipment UE, uplink receiving signal, uplink channel estimation value, uplink receiving.
10. device according to claim 8, is characterized in that, described acquisition module comprises:
Acquiring unit, for obtaining the variance of described uplink demodulation information or the absolute difference of consecutive value;
Estimation unit, for estimating the intensity of variation of channel according to described variance or described absolute difference.
11. devices according to claim 7, is characterized in that, described adjusting module, for adopting corresponding target BLER or outer shroud to control the CQI that thresholding adjustment scheduling is used according to the described intensity of variation obtaining; And/or according to the transmitting power of the described intensity of variation adjustment downlink data obtaining.
12. 1 kinds of base stations, is characterized in that, comprising: the device described in claim 7-11 any one.
CN201210284655.7A 2012-08-10 2012-08-10 Method and device for adjusting scheduling strategy and base station Pending CN103582148A (en)

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