CN104219748B - A kind of energy-conservation and user scheduling method of large-scale and multiple users mimo system - Google Patents
A kind of energy-conservation and user scheduling method of large-scale and multiple users mimo system Download PDFInfo
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- CN104219748B CN104219748B CN201410475880.8A CN201410475880A CN104219748B CN 104219748 B CN104219748 B CN 104219748B CN 201410475880 A CN201410475880 A CN 201410475880A CN 104219748 B CN104219748 B CN 104219748B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to a kind of energy-conservation and user scheduling method of scale multi-user MIMO system, it is characterized in that, this method accurately calculates data transfer above and below the ascending power and descending power and progress of needs by base station and user equipment according to base station end state and user equipment end state, specifically includes up-link energy-saving distribution and downlink energy-saving distribution.Compared with prior art, the present invention has the advantages such as computation complexity is low.
Description
Technical field
The present invention relates to a kind of user scheduling method of mimo system, more particularly, to a kind of large-scale and multiple users MIMO systems
The energy-conservation and user scheduling method of system.
Background technology
In large-scale and multiple users mimo system, how to carry out low complex degree user dispatch with realize energy-conservation be one urgently
The problem of to be solved.There is presently no the scheduling of the user specifically for large-scale and multiple users mimo system and power-economizing method, big
In scale multi-user MIMO system unnecessary executive overhead, nothing can be brought using user's scheduling of routine and Poewr control method
Method realizes optimal efficiency of energy utilization.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of large-scale and multiple users
The energy-conservation and user scheduling method of mimo system.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of energy-conservation and user scheduling method of large-scale and multiple users mimo system, this method pass through base station and user equipment
The user's terminal transmitting power of needs is accurately calculated according to base station end state and user equipment end state and descending power and carried out
Data transfer, specifically include up-link energy-saving distribution and downlink energy-saving distribution.
The up-link energy-saving distribution comprises the following steps：
101) antenna amount and noise power of base station end notifying user equipment base station end；
102) user equipment end obtains channel gain by reverse link measurement and determines to reach up required for transmission
Signal-to-noise target value；
103) user equipment end calculates the user's terminal transmitting power p needed for up-link transmissionUE, k：
Wherein：For the noise power of user equipment base station end,For up signal-to-noise target value, M is base station end
Antenna amount,For channel gain；
104) user equipment end carries out up-link transmission using the user's terminal transmitting power calculated.
The downlink energy-saving distribution comprises the following steps：
201) noise power at user equipment end notice base station end user device end；
202) base station end obtains channel gain by reverse link measurement and determines to need the descending signal to noise ratio target reached
Value；
203) base station end calculates the descending power supported required for user equipment k downlink transmissions
Wherein；For descending signal-to-noise target value,For the noise power at user equipment end,For channel gain,
M is the antenna amount of base station end；
204) base station end is summed to the descending power required for supporting all any active ues, if itself and more than base station
Transmission power, then step 205) is performed, if itself and the transmission power less than or equal to base station, perform step 206)；
205) base station end selects k user equipment to be serviced simultaneously according to selection standard；
206) all any active ues are all serviced.
The descending power sum for the k user equipment selected in the step 205) is less than the transmission power of base station.
The user equipment (UE) only has an antenna.
The selection standard includes overall rate and maximizes and service object number maximization.
Compared with prior art, the present invention has advantages below：
1) power saving in large-scale and multiple users mimo system is realized.
2) computation complexity is low.
Brief description of the drawings
Fig. 1 is the up power-economizing method flow chart of the present invention；
Fig. 2 is the descending power-economizing method flow chart of the present invention；
Fig. 3 is the apparatus structure schematic diagram of the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
A kind of energy-conservation and user scheduling method of large-scale and multiple users mimo system, the present invention is up, and do is user power
Control, it is descending do be user scheduling, be all for the purpose of energy-conservation.
This method accurately calculates needs by base station and user equipment according to base station end state and user equipment end state
User's terminal transmitting power and descending power simultaneously carry out data transmission, and specifically include up-link energy-saving distribution and downlink section
Can scheduling.
For up-link, the antenna amount of base station is represented with M, uses hUL, kThe vector channel of user k M × 1 is represented, then base
Stand receive signal be：
Wherein xUL, kIt is the symbol of the carrying message of user, E (| xUL, k|2)=1, nBSRepresent the additive white noise of base station, side
Difference is
Because filtering detection method preferably with matching in large-scale and multiple users mimo system,
So user k upstream sinr is：
Up energy-conservation：When M is very big, and during M ＞ ＞ K,
According to the law of large numbers, therefore when M is very big,
When M is very big
Therefore, if pUE, kConstant for M, then with increase, ρUE, k→+∞, but SINR must not yet
Will infinity.To ensure the requirement of transmission quality, we can set pUE, kWith the linear reduction of M reduction, i.e.,：
Wherein ckIt is a coefficient unrelated with M, above formula is substituted into ρUE, kFormula, when M is very big, we can obtain：
Transmission data are successfully decoded and meet user k QoS index, it is desirable to
WhereinIt is user k SINR threshold values.For user k given SINR threshold valuesckNeed to meet：
For UE power savings and meet transmission requirement, we can set：
WhereinBe in base station it is known,It is known in UE, and at UEMeasured by reverse link
Arrive, therefore UE transmission power is：
Wherein M is known in base station.
Uplink user is dispatched：According to ρUL, kExpression formula can be seen that when the antenna amount of base station is larger and during M ＞ ＞ K, on
The multi-user interference of line link can be ignored, therefore can dispatch all any active ues simultaneously and send number in the uplink
According to.
As shown in figure 1, up-link energy-saving distribution comprises the following steps：
101) antenna amount and noise power of base station end notifying user equipment base station end；
102) user equipment end obtains channel gain by reverse link measurement and determines the noise reached required for transmission
Than desired value, the value is determined by user's request, is known quantity；
103) user equipment end calculates the user's terminal transmitting power p needed for up-link transmissionUE, k：
Wherein：For the noise power of user equipment base station end,For up signal-to-noise target value, M is base station end
Antenna amount,For channel gain；
104) user equipment end carries out up-link transmission using the user's terminal transmitting power calculated.
F is used respectivelyBS, kAnd hDL, kVector channel corresponding to the precoding vector of M × 1 and 1 × M of user data transmission is represented,
User k receive signal be：
yUE, k=hDL, kfBS, kxDL, k+Σk′≠khDL, kfBS, k 'xDL, k '+nUE, k
Wherein xDL, kBe user k carry message symbol, E (| xDL, k|2)=1 and nUE, kIt is UE additive white noise, variance
For
Because in extensive MIMO tdd systems, it is proposed that using Wave beam forming precoding is combined, i.e.,：
Wherein it is the distribution power of user's k data flows, user k reception signal is：
And
Therefore, user k downlink SINR is：
When M is very big and during M ＞ ＞ K：
According to the law of large numbers and reason：
Therefore
In order to which the data of transmission are successfully decoded and met with user k QoS index, it would be desirable to meet claimed below
Wherein ρDL, kIt is user k SINR threshold values, user k distribution power must is fulfilled for：
Use PBS, maxThe maximum transmission power of base station is represented, base station transmitting power is limited to：
∑pBS, k≤PBS, max.
Downlink user selects and power distribution：Assuming that there is K1Individual any active ues, user k required power distribution can be with
Calculated according to formula below：
Wherein M is datum in base station,Set in base station,In base station measurement,UE is needed to represent, if
So according to selection standards such as overall rate maximizations, meet condition：
K user can be serviced simultaneously, the corresponding distribution powers of user k are
Downlink saves：If K user and
The distribution power of so each user isAnd and utilize what UE was expressedIt can be seen that base station
Transmission power be less than PBS, max, this represents that base station transmitting power energy-conservation realizes.
As shown in Fig. 2 downlink energy-saving distribution comprises the following steps：
201) noise power at user equipment end notice base station end user device end；
202) base station end obtains channel gain by reverse link measurement and determines to need the received signal to noise ratio target reached
Value；
203) base station end calculates the descending power supported required for user equipment k downlink transmissions
Wherein：Descending signal-to-noise target value,For the noise power at user equipment end,For channel gain, M
For the antenna amount of base station end；
204) base station end is summed to the descending power required for supporting all any active ues, if itself and more than base station
Transmission power, then step 205) is performed, if itself and the transmission power less than or equal to base station, perform step 206)；
205) base station end selects k user equipment to be serviced simultaneously according to selection standards such as overall rate maximizations；
206) all any active ues are all serviced.
The descending power sum for the k user equipment selected in step 205) is less than the transmission power of base station.
It is given below in specific scene, it is assumed that in a time division duplex cellular system, a certain UE roams into base station
In a certain cell equipped with a large amount of antennas, UE can have found that cell is in extensive MIMO mode of operations, antenna in access procedure
Quantity M and base station noise level are sent to UE by cell information, while the message can also be sent to cell by broadcast mode
Interior all UE.
Up-link：If UE has multiple antennas, it will use main characteristic vector to transmit and using main characteristic vector as pre-
Coding vector.UE estimates channel variance by backward chainingAnd transmission power is adjusted to pUE, k：
Wherein：
Obtained from base station,Require to set according to uplink data flow by UE.
Downlink：Each UE is by UE specific messages by noise levelSend to base station, base station and used according to each
Power distribution needed for the stream calculation of family
WhereinIncluded in the UE specific messages of response,Set by base station according to transmission quality requirements, M exists
Base station is known quantity, andIt is that base station is estimated by reverse link.If K1It is individual enliven UE and base station end to support K1Individual work
Descending power sum required for jump user is more than the transmission power of base station, then according to selections such as overall rate maximizations
Standard, the base station selected K user (the descending power sum of this K user is not more than the transmission power of base station) for meeting condition,
Precoding is carried out to the data flow of K user by combining Wave beam forming, is the power of each customer traffic assignment response, and
Send all precoded streams simultaneously.If the K1Descending power sum required for individual any active ues is not more than the hair of base station
Penetrate power, then each the power distribution of customer traffic is：
Therefore the transmission power of base station is：
This represents that base station transmitting power energy-conservation realizes.
Claims (5)
1. a kind of energy-conservation and user scheduling method of large-scale and multiple users mimo system, it is characterised in that this method passes through base station
The user's terminal transmitting power of needs and descending is accurately calculated according to base station end state and user equipment end state with user equipment
Power simultaneously carries out data transmission, and specifically includes up-link energy-saving distribution and downlink energy-saving distribution；
The up-link energy-saving distribution comprises the following steps：
101) antenna amount and noise power of base station end notifying user equipment base station end,
102) user equipment end obtains channel gain by reverse link measurement and determines the up noise reached required for transmission
Than desired value,
103) user equipment end calculates the user's terminal transmitting power p needed for up-link transmissionUE, k：
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Wherein：For the noise power of user equipment base station end,For up signal-to-noise target value, M is the antenna of base station end
Quantity,For channel gain,
104) user equipment end carries out up-link transmission using the user's terminal transmitting power calculated.
2. the energy-conservation and user scheduling method of a kind of large-scale and multiple users mimo system according to claim 1, its feature
It is, the downlink energy-saving distribution comprises the following steps：
201) noise power at user equipment end notice base station end user device end；
202) base station end obtains channel gain by reverse link measurement and determines to need the descending signal-to-noise target value reached；
203) base station end calculates the descending power supported required for user equipment k downlink transmissions
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Wherein：For descending signal-to-noise target value,For the noise power at user equipment end,For channel gain, M is
The antenna amount of base station end；
204) base station end is summed to the descending power required for supporting all any active ues, if itself and the transmitting more than base station
Power, then step 205) is performed, if itself and the transmission power less than or equal to base station, perform step 206)；
205) base station end selects k user equipment to be serviced simultaneously according to selection standard；
206) all any active ues are all serviced.
3. the energy-conservation and user scheduling method of a kind of large-scale and multiple users mimo system according to claim 2, its feature
It is, the descending power sum for the k user equipment selected in the step 205) is less than the transmission power of base station.
4. the energy-conservation and user scheduling method of a kind of large-scale and multiple users mimo system according to claim 2, its feature
It is, the user equipment (UE) only has an antenna.
5. the energy-conservation and user scheduling method of a kind of large-scale and multiple users mimo system according to claim 2, its feature
It is, the selection standard includes overall rate and maximizes and service object number maximization.
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| JP2008535431A (en) * | 2005-04-08 | 2008-08-28 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Power control and link adaptation scheme based on multi-user detection |
| CN101079660B (en) * | 2007-07-02 | 2011-07-06 | 重庆邮电大学 | Downlink power distribution method of multi-user JT MIMO system |
| CN101399576B (en) * | 2007-09-29 | 2012-07-11 | 华为技术有限公司 | Method, system and device for enhancing uplink transmission performance |
| CN101582707B (en) * | 2008-05-12 | 2016-08-31 | 联想(北京)有限公司 | A kind of power distribution method and base station thereof |
| CN101702700A (en) * | 2009-11-24 | 2010-05-05 | 上海第二工业大学 | Method for allocating minimum power of MIMO-OFDM multi-user system based on allelism |
| CN102638894B (en) * | 2012-04-27 | 2014-10-29 | 电信科学技术研究院 | Method and equipment for distributing PDSCH (physical downlink shared channel) power |
| CN104412674A (en) * | 2012-07-06 | 2015-03-11 | 瑞典爱立信有限公司 | Methods and nodes for multiple user mimo scheduling and power control |
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