CN102340853A - Mobile communication system base station energy-saving method and device - Google Patents
Mobile communication system base station energy-saving method and device Download PDFInfo
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- CN102340853A CN102340853A CN2010102345696A CN201010234569A CN102340853A CN 102340853 A CN102340853 A CN 102340853A CN 2010102345696 A CN2010102345696 A CN 2010102345696A CN 201010234569 A CN201010234569 A CN 201010234569A CN 102340853 A CN102340853 A CN 102340853A
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Abstract
The embodiment of the invention discloses a method for realizing mobile communication system base station energy saving, which is applied to a line terminator equipment (LTE) system, and comprises the steps that: a downlink business load value of a current community is determined; when the downlink business load value is smaller than a downlink business load threshold value, the sub frames of the downlink data are determined not to be sent; and radio frequency channels which correspond to the downlink sub frames are closed. The method of the embodiment of the invention is adopted, the number of downlink sub frames required for meeting the needs of the communication services of the current community is judged according to the change of the business load by measuring the business load value in the community; and the sub frames which are vacant and can be closed are closed and the corresponding radio frequency channels are closed, so that the purpose of reducing energy consumption is achieved. The embodiment of the invention also provides a corresponding realization device.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to base station energy-saving method and device thereof in a kind of GSM.
Background technology
Distribute from the energy resource consumption of mobile communication network, in the middle of whole mobile network, the energy resource consumption of base station facility is maximum, has accounted for 90%, and other comprise core net facility and Network Management Equipment etc. have only accounted for the energy resource consumption less than 10%.And in the energy resource consumption of base station facility, the base station main equipment accounts for about 50%, and heat dissipation equipments such as air conditioner in machine room account for about 45%.
In order to reduce energy resource consumption, build the green mobile communication network, technical mainly from the consideration of following three aspects:
1, the main equipment design aspect in the base station is used various new technologies such as high efficiency digital power amplifier, introduces new products such as distributed base station, big capacity base station; Support to dispose more flexibly, support multiple standard, improve the utilance of hardware facility;
2, aspect the construction of machine room, through the intelligent aeration transformation is carried out in the base station,, adopt integrated machine room etc. like modes such as direct ventilation application, natural heat dissipations, reduce the requirement of machine room to heat dissipation equipment;
3, aspect energy source use, improve the ratio of utilizing clean energys such as solar energy, wind energy and biogas.
Wherein, the energy-saving design of base station main equipment and application have crucial meaning.Effectively reduce base station main equipment energy consumption, can also effectively reduce the dependence of equipment, reduce the load of supporting power supply and air conditioner in machine room to a great extent, thereby more effectively reduce total energy consumption building environment.
In the middle of the main equipment of base station; Most of energy is used for the power amplifier of the key components of base station unit; How under the prerequisite of guaranteed output linearity of amplifier index; Reduce the energy consumption of power amplifier, the generation of minimizing heat, be the key that reduces equipment integral energy consumption, energy savings as far as possible.
In order to reach energy saving purposes; In the network management of whole mobile communication, need to adopt the resource fine-grained management, as a certain period (such as at night 10 between 5 of mornings); Some regional users are less; Then can consider under the prerequisite that satisfies the basic communication demand, the closed portion carrier frequency, thus effectively cut down the consumption of energy.
The development of technology has proposed higher energy-conservation requirement to the fine-grained management of GSM.The how meticulousr base station equipment energy consumption is managed reduces non-essential energy resource consumption, be system design from now on realize in the middle of vital task.LTE (Long Term Evolution, Long Term Evolution) system will be applied increasing in future as the third generation mobile communication system, reduce the energy consumption of LTE system, and is significant to building the green mobile communication network.
Summary of the invention
The embodiment of the invention is primarily aimed at the LTE system, proposes to utilize the method and apparatus of closing descending sub frame realization base station energy-saving.
The embodiment of the invention provides a kind of base stations in mobile communication system power-economizing method, and this method comprises the steps:
Confirm the downlink business load value of current area;
When said downlink business load value less than downlink business load door limit value, confirm the descending sub frame that can close;
Close the corresponding radio-frequency channel of said descending sub frame.
The embodiment of the invention provides a kind of base station apparatus; Comprise base station dispatcher, base band data processing unit; It is characterized in that, also comprise: information gathering statistic unit, subframe close judging unit and performance element is closed in subframe shut down decision unit, radio-frequency channel closing information acquiring unit, radio-frequency channel; Wherein,
The information gathering statistic unit is used to collect the traffic load information with accounting base-station, according to the periodic report statistics information of setting; The cycle of said setting is the integral multiple of 10ms;
Subframe is closed judging unit, is used for the statistics information that reports according to the information gathering statistic unit, determines whether to close descending sub frame; Subframe shut down decision unit is used for definite subframe of carrying out shutoff operation;
Radio-frequency channel closing information acquiring unit is used to detect the radio-frequency channel closing information, produces and send the instruction of closing the radio-frequency channel;
Performance element is closed in the radio-frequency channel, is used for closing according to the radio-frequency channel instruction of detecting unit, carries out the operation of closing the radio-frequency channel.
The embodiment of the invention also provides a kind of radio frequency remote unit RRU device, comprises the base band data receiving element, it is characterized in that, also comprises: performance element is closed in radio-frequency channel closing information acquiring unit and radio-frequency channel;
Said radio-frequency channel closing information acquiring unit is used to detect the radio-frequency channel closing information, produces and send the instruction of closing the radio-frequency channel;
Performance element is closed in said radio-frequency channel, is used for saidly closing the instruction of detecting unit according to the radio-frequency channel, carries out the operation of closing the radio-frequency channel.
The embodiment of the invention through the measurement cell levels of traffic, satisfies the needed descending sub frame quantity of current area communication service according to the variation judgement of traffic load; The subframe of closing the free time and can close at the respective rf passage, thereby reaches the purpose that cuts down the consumption of energy.
Description of drawings
Fig. 1 is a LTE system first kind wireless frame structure sketch map;
Fig. 2 is second type of wireless frame structure sketch map of LTE system;
Fig. 3 is a LTE system descending physical resource sketch map;
The integrated energy-saving base station apparatus sketch map that Fig. 4 provides for the embodiment of the invention;
First kind of distributed energy-saving base station device sketch map that Fig. 5 provides for the embodiment of the invention;
Second kind of distributed energy-saving base station device sketch map that Fig. 6 provides for the embodiment of the invention.
Embodiment
3-G (Generation Three mobile communication system) standardization body (3GPP) has stipulated that Long Term Evolution (LTE) system of 3G wireless interface technology supports 2 kinds of wireless frame structures:
A, first kind radio frames, be applicable to FDD (its structure is as shown in Figure 1 for Frequency Division Duplex, FDD) system, wherein:
The frame length of first kind radio frames is 10ms, is made up of 20 time slots (Slot), and each slot length is 0.5ms, is labeled as #0～#19 among Fig. 1.Per two continuous time slot are defined as a sub-frame (Subframe), have 10 sub-frame, that is: subframe i is made up of time slot 2i and 2i+1, wherein i=0,1,2......9.
When first kind radio frames was applied to the FDD system, because the up-downgoing of frequency division duplex system separates on frequency domain, therefore every 10ms was in the time, and the provisional capital has 10 sub-frame to use up and down.
B, second type of radio frames are only applicable to the TDD system, and its structure is as shown in Figure 2, wherein:
The frame length of radio frames is 10ms, and every frame is divided into the field (Half Frame) of 2 5ms.The field of each 5ms is divided into conventional time slot (Slot) and 1 special time slot zone that length is 1ms that 8 length are 0.5ms; The special time slot zone of this 1ms is by descending pilot frequency time slot (Downlink Pilot TimeSlot; DwPTS), protection time slot (Guard Period; GP) and uplink pilot time slot (Uplink PilotTime Slot UpPTS) constitutes; Simultaneously, per two conventional time slots are composed of a sub-frame (Subframe), and wherein subframe # 0 and descending pilot frequency time slot always are used for downlink transfer, and uplink pilot time slot always is used for uplink.The TDD system frame structure has defined 7 kinds of configuration modes at present, shown in table one:
Table one,
Wherein, D representes descending conventional subframe, and U representes uplink conventional subframe, and S representes special subframe.When cell networking was planned, the descending/sub-frame of uplink proportional arrangement of sub-district just confirmed, follow-uply can not change basically.
In the LTE system; Down control channel comprises: PCFICH (Physical Control Format Indicator CHannel; Physical Control Format Indicator Channel), PHICH (Physical Hybrid ARQ Indicator CHannel; Physical HARQ Indicator Channel) and PDCCH (Physical Downlink Control CHannel, Physical Downlink Control Channel).
PCFICH carries OFDM symbol numbers (1,2, the 3 or 4) information that is used to transmit PDCCH in the sub-frame.PCFICH first symbol in descending sub frame transmits; UE must confirm the time long span (weighing with the OFDM symbol numbers) of DCI before the demodulation control information.System utilizes the shared OFDM symbol numbers of CFI (Control Format Indicator)=1,2,3 expression PDCCH.When
; The time long span of DCI possibly be 1; 2 or 3, by the value sign of CFI.When
; The time long span of DCI possibly characterize with CFI+1 for from 2 OFDM symbols to 4 OFDM symbol at this moment.The symbol numbers that takies as PDCCH is greater than 0 the time, and PCFICH exists.The 2bit information of PCFICH is encoded to 32bit; Adopt the QPSK modulation; PCFICH is mapped in the descending sub frame 4 resource unit group (REG of symbol for referencial use of no use in first OFDM symbol; I.e. 4 continuous physical resource unit), 4 REG of mapping PCFICH equidistantly are distributed on the whole system bandwidth.
PHICH contains the ACK/NACK feedback information of corresponding PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel).A plurality of PHICH are mapped on the identical Resource Unit, form the PHICH group, are mapped on the physical resource particle that is not used in reference signal and PCFICH transmission.
PDCCH carries scheduling and other control informations; Wherein mainly comprise and indicate UL-SCH (Uplink Shared CHannel respectively; Uplink Shared Channel), DL-SCH (Downlink Shared Channel; DSCH Downlink Shared Channel) TPC of assignment information and PUCCH and PUSCH (Transmit Power Control, transmission power control) information etc.PDCCH occupies the top n OFDM symbol of subframe, and the N value can be 1,2,3 or 4.
The embodiment of the invention proposes a kind of method that realizes base station energy-saving, specifically comprises:
Confirm the downlink business load value of current area;
When said downlink business load value less than downlink business load door limit value, confirm the descending sub frame that can close;
Close the corresponding radio-frequency channel of said descending sub frame.
The radio-frequency channel comprises small-signal part and large-signal part, and small-signal partly comprises analogue devices such as digital to analog converter and analog transceiver letter machine, and large-signal partly comprises power amplifier.Under the smaller situation of cell load, the part descending sub frame does not send or seldom sends data.Under the situation of not carrying out the radiofrequency signal transmission, the radio-frequency channel can be still in running order, and the energy that is consumed in this case is not converted into useful radiofrequency signal, and the energy that is consumed has consumed with the mode of thermal losses.Therefore; At system's actual motion and mobile communication when service is provided; Under the situation of offered load less than certain threshold value; The base station can utilize closed portion descending sub frame or time slot, makes respective rf passage, power amplifier get into low energy consumption state or closed condition, thereby reduces the consumption of the energy.
Guaranteeing that each QoS of survice (Quality of Service, service quality) is a basic point of departure, the base station in running, through real-time detection levels of traffic, when traffic load less than certain threshold value, then can carry out subframe and turn-off.
The number of closing subframe is all relevant with the average amount size that a sub-frame can be carried with threshold value,
The downlink business load door limit value=average amount * K_DL * η that descending sub frame carries; Wherein, K_DL is available descending sub frame number, the stressor of η for setting, 0＜η＜1.The descending sub frame number is K_DL in a period of time; If downlink business load value＜downlink business load door limit value * (K_DL-1)/K_DL; Then can start descending sub frame and turn-off operation, if downlink business load value＜downlink business load door limit value * (K_DL-m)/K_DL, then can close m descending sub frame at most; Wherein, m＜K_DL.
Accordingly,, close the radio-frequency channel of the corresponding sub-frame of uplink in base station, can reduce the amount of calculation that the base station is detected, received RF signal is also decoded, also have the effect that cuts down the consumption of energy for being not used in the sub-frame of uplink that upstream data receives,
Average amount * λ that up threshold value=one sub-frame of uplink carries;
The sub-frame of uplink number is K_UL in a period of time; If up average cell load＜up threshold value * (K_UL-1); Then start sub-frame of uplink shutoff technology, if up average cell load＜up threshold value * (K_UL-n), then could close n sub-frame of uplink at most; Wherein, n＜K_UL.
Measuring the downlink business load value can realize through the mode of monitoring capacity performance index; For example; The real-time data volume in the monitoring downlink data buffering area (Buffer) is perhaps according to the statistical average data amount (measurement period is the integral multiple of 10ms) of data volume among the descending Buffer.
In the LTE system, when not having control channel in the descending subframe, then can carry out the shutoff operation of this descending sub frame; One sub-frame is made up of two adjacent time slots, if there is control channel in descending sub frame, but this subframe then can be carried out the shutoff operation of single time slot in the descending sub frame not during bearing downlink shared channel information.
When confirming the descending sub frame that to close, need to consider the influence of common signal channel, such as broadcasting, paging etc.; Need to consider the influence of uplink data scheduling; The influence that needs consideration that upstream data HARQ is replied; And the influence that needs to consider semi-continuous scheduling.
As shown in Figure 3, the least resource unit that the LTE system transmissions is used as resource (Resource Element, RE), several resource form a Resource Block (Resource Block, RB).Down physical channel is used to carry the high-rise information that comes from corresponding to the set of a series of resource.
PSCH (Primary Synchronization CHannel in the middle of the down physical channel; Primary synchronization channel), SSCH (Secondary Synchronization CHannel; Auxiliary synchronization channel), PBCH (Physical Broadcast Channel; Physical Broadcast Channel) belong to the cell-level channel, its resource location confirms that the regulation in standard is following:
For the FDD system, PSCH is positioned on centre 72 number of sub-carrier of time slot 0 and time slot 10 last OFDM symbol; For the TDD system, PSCH is positioned on centre 72 number of sub-carrier of the 3rd OFDM symbol of subframe 1 and subframe 6.
For the FDD system, SSCH is positioned on time slot 0 and middle 72 number of sub-carrier of time slot 10 penult OFDM symbols; For the TDD system, SSCH is positioned on middle 72 number of sub-carrier of 11 last OFDM symbols of time slot 1 and time slot.
PBCH is positioned in the middle of preceding four symbols of time slot 1 of subframe 0 on 72 number of sub-carrier.
Therefore, for the FDD system, wherein subframe 0 and subframe 5 can not realize closing subframe owing to carry broadcast channel and synchronizing signal; For the TDD system, wherein subframe 0, subframe 1, subframe 5 and subframe 6 are not carried out shutoff operation to these subframes owing to carry broadcast channel or synchronizing signal in the present embodiment; Subframe 2 is set to the descending sub frame that sub-frame of uplink can not be set to close all the time.
For the FDD system, the descending sub frame of closing available in each radio frames is: subframe 1, subframe 2, subframe 3, subframe 6, subframe 7, subframe 8, corresponding to 6 bits of bitmap; For the TDD system, the descending sub frame of closing available in each radio frames is: subframe 3, subframe 4, subframe 7, subframe 8, subframe 9, corresponding to preceding 5 bits of bitmap, last 1 bit of bitmap does not use.
According to the descending sub frame quantity of confirm to satisfy business demand, confirm the subframe can not send downlink data, need confirm then which descending sub frame is carried out to close.The subframe of closing if desired is used for the bearing downlink data, then need dispatch, and institute's data carried by data is transferred in other available descending sub frames transmitted.The descending sub frame that the base station is closed execution will not carry out data dispatch, not dispose PCFICH, not send descending public reference signal; Do not carry out data dispatch at the sub-frame of uplink that is associated.
For the convenience of dispatching, for the TDD system, carry out the descending sub frame of closing, can select the descending sub frame of respective wireless frame or field afterbody.When carrying out the descending sub frame of closing is two when above, can select in the middle of respective wireless frame or the field the continuous descending sub frame of corresponding number to carry out and close.Uplink-downlink configuration 2 with in the middle of the table one is an example, when the descending sub frame quantity that can close is 1, can select subframe 4, subframe 9 to carry out and close; When the descending sub frame quantity that can close is 2, can selects subframe 3 to carry out and close with subframe 4, subframe 8 and subframe 9.Can his-and-hers watches one central other uplink-downlink configuration modes select the subframe that execution is closed with identical principle, repeat no more.
Switch the signal that brings and disturb in order to reduce the base station up-downgoing, can carry out the descending sub frame that the next-door neighbour is up to descending switching point and close.For example for the uplink-downlink configuration 2 in the middle of the table one, can carry out the descending sub frame number of closing is 1 o'clock, can select subframe 3, subframe 8 to carry out and close.Can his-and-hers watches one central other uplink-downlink configuration modes select the subframe that execution is closed with identical principle, repeat no more.
In order to make the terminal obtain to close the information of descending sub frame, the base station can be notified which descending sub frame execution of terminal to close perhaps descending time slot execution with signaling method and close.
The mode of closing the corresponding radio-frequency channel of said descending sub frame does; Can carry out a Close All operation of radio-frequency channel; Also can carry out substep and close the radio-frequency channel, promptly branch radio-frequency channel small-signal partly turn-offs (analogue devices such as digital to analog converter, analog transceiver letter machine) and large-signal is partly turn-offed (power amplifier).
The embodiment of the invention also provides the concrete implementation of energy-saving base station device.
For integrated base station; The present invention has provided a kind of concrete device for carrying out said; As shown in Figure 4, base station apparatus comprises: information gathering statistic unit 401, subframe are closed judging unit 402, subframe shut down decision unit 403, base station dispatcher 404, base band data processing unit 405, radio-frequency channel closing information acquiring unit 406 and radio-frequency channel and are closed performance element 407.
Wherein, information gathering statistic unit 401 is used to collect the traffic load information with accounting base-station, according to the periodic report statistics information of setting.Report cycle can be set as required, and the cycle that sets is the integral multiple of 10ms.
Subframe is closed judging unit 402, is used for the statistics information that reports according to information gathering statistic unit 401, determines whether to close descending sub frame, and notifies subframe shut down decision unit 403 with judged result.
Subframe shut down decision unit 403 is used for confirming can carrying out the subframe which does not send downlink data and closes, and informing base station scheduler 404.
The sequential relationship that base station dispatcher 404 is dispatched according to the distribution and the ascending-descending subframes of uplink business data, definite subframe of not sending downlink data, and notice base band data processing unit 405.
The subframe of closing if desired is used for the bearing downlink data, then need dispatch, and institute's data carried by data is transferred in other available descending sub frames transmitted.In the descending sub frame of confirming to close, will not carry out data dispatch, and not dispose PCFICH, do not send descending public reference signal; To not carry out data dispatch at the sub-frame of uplink that is associated.
Base band data processing unit 405, according to base station dispatcher 404 notice, the base band data that can carry out the descending sub frame of closing is set to particular value, and particular value can be complete 0 perhaps complete 1, can also be that specific being used to identifies the sequence that subframe is closed.
Radio-frequency channel closing information acquiring unit 406; Be used to detect first symbol of second time slot of first symbol or each descending sub frame of each descending sub frame; Perhaps detect the original position of each descending sub frame; If base band data is continuous particular value or is used to identify the sequence that subframe is closed that then the time started of this symbol point is for carrying out the time started point of closing.This unit also produces and sends the instruction of closing the radio-frequency channel, and instruction type can be switch level or other instruction types.If the base band data processing unit 405 not base band data of descending sub frame is set to particular value, judge again after then need when judging, considering to get rid of the positional information of public guide frequency.
Performance element 407 is closed in the radio-frequency channel, closes the time point of detecting unit 406 output according to the radio-frequency channel and carries out the radio-frequency channel shutoff operation, puts last symbol of subframe/time slot between from the outset and carries out radio-frequency channel shutoff operation.
The different demands of performance element 407 according to the radio-frequency channel design are closed in the radio-frequency channel; Can carry out a Close All operation of radio-frequency channel; Also can carry out the operation that substep is closed the radio-frequency channel, promptly branch radio-frequency channel small-signal partly turn-offs (analogue devices such as digital to analog converter, analog transceiver letter machine) and large-signal is partly turn-offed (power amplifier).
In practical application, because radio-frequency devices when off state is transformed into operating state, needs signal stabilization process of experience; Therefore; The concluding time that subframe is closed the cycle needs suitably in advance, according to the device difference of stabilization time, generally needs 1～5us in advance.
For the distributed frame base station, RRU (Radio Resource Unit, wireless remote unit) side need be judged from when beginning to close the radio-frequency channel according to the data cases that BBU (Base Band Unit, Base Band Unit) sends to RRU voluntarily; In the BBU side closing information detection notice unit, radio-frequency channel can be set also, be used to notify RRU to close the radio-frequency channel when.
Present embodiment has provided concrete device for carrying out said; As shown in Figure 5; In the BBU side, comprising: information gathering statistic unit 501, subframe are closed judging unit 502, subframe shut down decision unit 503, base station dispatcher 504, base band data processing unit 505 and closing information detection notice unit, radio-frequency channel 506.In the RRU side, comprising: base band data receiving element 511, radio-frequency channel closing information acquiring unit 512 is closed performance element 513 with the radio-frequency channel.
Wherein, information gathering statistic unit 501 is used to collect the traffic load information with accounting base-station, according to the periodic report statistics information of setting.Report cycle can be set as required, and the cycle that sets is the integral multiple of 10ms.
Subframe is closed judging unit 502, is used for the statistics information that reports according to information gathering statistic unit 501, determines whether to close descending sub frame, and notifies subframe shut down decision unit 503 with judged result.
Subframe shut down decision unit 503 is used for confirming can carrying out the subframe which does not send downlink data and closes, and informing base station scheduler 504.
The sequential relationship that base station dispatcher 504 is dispatched according to the distribution and the ascending-descending subframes of uplink business data, definite subframe of not sending downlink data, and notice base band data processing unit 505.
Base band data processing unit 505; The base band data that can carry out the descending sub frame of closing according to the notice of base station dispatcher 504 is set to particular value, and (particular value can be complete 0 or complete 1; Can also be that specific being used to identifies the sequence that subframe is closed), and base band data sent to RRU.
Closing information detection notice unit, radio-frequency channel 506 is used to detect first symbol or the original position of each subframe of second time slot of first symbol or each descending sub frame of each descending sub frame; If base band data is continuous particular value or is used to identify the sequence that subframe is closed; Then the time started of this symbol point is for carrying out the time started point of closing; And will put notice the shut-in time and give RRU, concrete advice method can be realized with signaling method.
In the RRU side, base band data receiving element 511 is used to receive the base band data from BBU.
The radio frequency shut-in time dot information that radio-frequency channel closing information acquiring unit 512 receives from the BBU side, and close performance element 513 to the radio-frequency channel and send corresponding control command.
The radio-frequency channel is closed performance element 513 and is closed and open operation according to the control command execution radio-frequency channel of radio-frequency channel closing information acquiring unit 512 outputs.
The different demands of performance element according to the radio-frequency channel design are closed in the control radio-frequency channel; Can carry out a Close All operation of radio-frequency channel; Also can carry out the operation that substep is closed the radio-frequency channel, promptly branch radio-frequency channel small-signal partly turn-offs (analogue devices such as digital to analog converter, analog transceiver letter machine) and large-signal is partly turn-offed (power amplifier).
For distributed base station; The present invention gives another kind of concrete device for carrying out said; As shown in Figure 6: as in the BBU side, to comprise: information gathering statistic unit 601, subframe are closed judging unit 602, subframe shut down decision unit 603, base station dispatcher 604 and base band data processing unit 605; In the RRU side, comprising: base band data receiving element 611, radio-frequency channel closing information acquiring unit 612 is closed performance element 613 with the radio-frequency channel.
Wherein, information gathering statistic unit 601 is used to collect the traffic load information with accounting base-station, according to the periodic report statistics information of setting.Report cycle can be set as required, and the cycle that sets is the integral multiple of 10ms.
Subframe is closed judging unit 602, is used for the statistics information that reports according to information gathering statistic unit 601, determines whether to close descending sub frame, and notifies subframe shut down decision unit 603 with judged result.
Subframe shut down decision unit 603 is used for confirming can carrying out the subframe which does not send downlink data and closes, and informing base station scheduler 604.
The sequential relationship that base station dispatcher 604 is dispatched according to the distribution and the ascending-descending subframes of uplink business data, definite subframe of not sending downlink data, and notice base band data processing unit 605.
Base band data processing unit 605; The base band data that can carry out the descending sub frame of closing according to base station dispatcher 604 notices is set to particular sequence; This sequence is used to indicate subframe closes, and this particular sequence can be continuous 0 or 1, also can be the particular sequence that can represent that this subframe is closed; And base band data sent to RRU.
In the RRU side, base band data receiving element 611 is used to receive the base band data from BBU.
First symbol of first symbol of radio-frequency channel closing information acquiring unit 612 each descending sub frame of detection or second time slot of each descending sub frame; Perhaps detect the subframe original position; If base band data is carried out the continuous particular sequence of closing for indicating this subframe; Then the time started of this symbol point is to carry out the time started point of closing, and radio frequency pathway closure performance element 613 is sent respective rf pathway closure/open command.
When 605 pairs of base band datas of base band data processing unit of BBU side are not provided with; But base band data is directly sent under the situation of RRU side, then need the radio-frequency channel of RRU side to close and judge again detecting unit 612 considers to get rid of the positional information of public guide frequency when judging after.
The radio-frequency channel is closed performance element 613 and is closed respective rf pathway closure/open command that detecting unit 612 sends according to the radio-frequency channel, carries out the radio-frequency channel and closes/open operation.Different demands according to the radio-frequency channel design; Can carry out a Close All operation of radio-frequency channel; Also can carry out the operation that substep is closed the radio-frequency channel, promptly branch radio-frequency channel small-signal partly turn-offs (analogue devices such as digital to analog converter, analog transceiver letter machine) and large-signal is partly turn-offed (power amplifier).
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (23)
1. the base stations in mobile communication system power-economizing method is characterized in that, comprises the steps:
Confirm the downlink business load value of current area;
When said downlink business load value less than downlink business load door limit value, confirm the descending sub frame that can close;
Close the corresponding radio-frequency channel of said descending sub frame.
2. method according to claim 1 is characterized in that, said downlink business load value is the data volume in the downlink data buffering area, perhaps, and the average amount in the measurement period of setting in the downlink data buffering area.
3. method according to claim 1 and 2 is characterized in that, the said downlink business load door limit value=average amount * K_DL * η that descending sub frame carries;
Wherein, K_DL is available descending sub frame number, the stressor of η for setting, 0＜η＜1.
4. method according to claim 3 is characterized in that,
Instantly industry affair load value＜downlink business load door limit value * (K_DL-m)/K_DL, then said maximum of not sending the number of sub-frames of downlink data is m;
Wherein, m is an integer, m＜K_DL.
5. method according to claim 4 is characterized in that, said subframe of not sending downlink data for the FDD system, is specially: one or more in the middle of subframe 1, subframe 2, subframe 3, subframe 6, subframe 7 and the subframe 8.
6. method according to claim 4 is characterized in that, said subframe of not sending downlink data for the TDD system, is specially: the descending sub frame of respective wireless frame or field afterbody; Perhaps, the next-door neighbour is up to the descending sub frame of descending switching point.
7. method according to claim 1 is characterized in that, after confirming the descending sub frame that can close, further comprises step: said descending sub frame data carried by data is dispatched to other available descending sub frames.
8. method according to claim 6 is characterized in that, saidly confirms that the subframe do not send downlink data comprises: one or more in the middle of subframe 3, subframe 4, subframe 7, subframe 8 and the subframe 9.
9. method according to claim 1 is characterized in that, the base station issues and comprises said definite signaling of not sending the sub-frame information of downlink data.
10. method according to claim 1 is characterized in that, said mode of closing the corresponding radio-frequency channel of said descending sub frame is in the corresponding time period, to close RF small signals part and/or rf large-signal part;
Said RF small signals partly comprise: digital to analog converter, analog transceiver letter machine;
Said rf large-signal partly comprises: power amplifier.
11. base station apparatus; Comprise base station dispatcher, base band data processing unit; It is characterized in that, also comprise: information gathering statistic unit, subframe close judging unit and performance element is closed in subframe shut down decision unit, radio-frequency channel closing information acquiring unit, radio-frequency channel; Wherein,
The information gathering statistic unit is used to collect the traffic load information with accounting base-station, according to the periodic report statistics information of setting; The cycle of said setting is the integral multiple of 10ms;
Subframe is closed judging unit, is used for the statistics information that reports according to the information gathering statistic unit, determines whether to close descending sub frame;
Subframe shut down decision unit is used for definite subframe of carrying out shutoff operation;
Radio-frequency channel closing information acquiring unit is used to detect the radio-frequency channel closing information, produces and send the instruction of closing the radio-frequency channel;
Performance element is closed in the radio-frequency channel, is used for closing according to the radio-frequency channel instruction of detecting unit, carries out the operation of closing the radio-frequency channel.
12. device according to claim 11 is characterized in that, the base band data that said base band data processing unit is carried out the subframe of shutoff operation is set to particular value or is used to identify the sequence that subframe is closed.
13. device according to claim 12 is characterized in that, said particular value is 0 or 1.
14., it is characterized in that the mode that detection radio-frequency channel closing information is closed in the radio-frequency channel is: the original position that detects each descending sub frame according to claim 12 or 13 described devices; If base band data is said particular value or is used to identify the sequence that subframe is closed, then should put the time started point of closing the radio-frequency channel instruction time started for said.
15. device according to claim 14; It is characterized in that; Performance element is closed in said radio-frequency channel, closes the time started point of closing the radio-frequency channel instruction that detecting unit is exported according to the radio-frequency channel, closes in corresponding subframe and carries out the radio-frequency channel shutoff operation in the cycle.
16. device according to claim 15 is characterized in that, the concluding time of said radio-frequency channel shutoff operation shifts to an earlier date 1～5us with respect to the subframe concluding time.
17. device according to claim 11, the operation of radio-frequency channel is closed in said execution, specifically is RF small signals part and/or rf large-signal are partly carried out shutoff;
Said RF small signals part comprises: digital to analog converter, analog transceiver letter machine;
Said rf large-signal part comprises: power amplifier.
18. device according to claim 11 is characterized in that,
Said information gathering statistic unit, subframe are closed judging unit, subframe shut down decision unit, base station dispatcher and base band data processing unit and are arranged in the Base Band Unit BBU;
Said radio-frequency channel closing information acquiring unit, radio-frequency channel are closed performance element and are arranged in the wireless extension unit RRU;
Said wireless extension unit RRU comprises that further the base band data receiving element is used to receive the base band data from Base Band Unit BBU.
19. device according to claim 18 is characterized in that,
Further comprise closing information detection notice unit, radio-frequency channel in the said Base Band Unit BBU; Be used to detect first symbol of second time slot of first symbol or each descending sub frame of each descending sub frame; If base band data is particular value or is used to identify the sequence that subframe is closed; Then the time started of this symbol point is to carry out the time started point of closing, and will put notice the shut-in time and give wireless extension unit RRU.
20. device according to claim 19 is characterized in that, said will to put the mode of notifying wireless extension unit RRU the shut-in time be signaling method.
21. a radio frequency remote unit RRU device comprises the base band data receiving element, it is characterized in that, also comprises: performance element is closed in radio-frequency channel closing information acquiring unit and radio-frequency channel;
Said radio-frequency channel closing information acquiring unit is used to detect the radio-frequency channel closing information, produces and send the instruction of closing the radio-frequency channel;
Performance element is closed in said radio-frequency channel, is used for saidly closing the instruction of detecting unit according to the radio-frequency channel, carries out the operation of closing the radio-frequency channel.
22. device according to claim 21 is characterized in that,
The mode that said radio-frequency channel closing information acquiring unit detects the radio-frequency channel closing information is: detect the radio-frequency channel that receives in the signaling and close indication information.
23. device according to claim 21 is characterized in that,
The mode that said radio-frequency channel closing information acquiring unit detects the radio-frequency channel closing information is: whether the original position that detects each descending sub frame is continuous particular value.
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