CN102687565A - Method and apparatus for controlling power of micro cell base station - Google Patents
Method and apparatus for controlling power of micro cell base station Download PDFInfo
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- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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Abstract
To solve the problem of the interference from a micro cell base station to a macro base station cell in existing technology, the present invention provides a method and an apparatus for controlling power of the micro cell base station. Wherein, the micro cell base station obtains the first interference coordination indication information from the macro base station, and the first interference coordination indication information is used for indicating the distribution of the potential interference from the macro base station to the micro cell base station. Whereafter, the micro cell base station determines the transmission power adjustment scheme according to the first interference coordination indication information and adjusts the transmission power of the micro cell base station to an optimization value, to reduce the interference between the macro base station and the micro cell base station, especially to reduce the interference from the micro cell base station to the macro base station.
Description
A kind of method and its engineering device technique field for being used to carry out microcell base station Power Control
The present invention relates to heterogeneous network, more particularly to the Power Control of the microcell base station in heterogeneous network.Background technology
At present, LTE-A (Long Term Evolution Advanced) standard is by heterogeneous network（Heterogeneous Networks, abbreviation HTN) technology consider within the scope of research.So-called heterogeneous network, is exactly to include a variety of base stations（Such as macro base station and other microcell base stations）, and the least partially overlapped network in the region that is covered of these base stations.For HTN systems, its important application is by microcell base station（Home eNodeB, abbreviation HeNB) it is incorporated into traditional cellular cell, to support hot-zone（Hot zone or Hot spot), and the business such as in-door covering.Within the system, as shown in figure 1, the cellular cell of macro base station 1 (Macro eNodeB) service（Maximum elliptical region in Fig. 1）Within generally there is the cell serviced by multiple microcell base station 2a, 2b, 2c, 2d, 2e, 2f, 2g（Seven cellular regions in Fig. 1）.Because the transimission power of microcell base station is relatively low, so the coverage of microcell base station is more much smaller than the macro base station of cellular cell.
Because the region that macro base station and microcell base station are covered has overlapping part, therefore, cell thousand disturbs the problem of coordination problem is one in heterogeneous network main.So far, there is the method for three kinds of main reduction inter-cell interference, be interference randomization, AF panel and interference coordination respectively（Inter Cell Interference Cancellation, IC ：).Traditional interference coordination technique is that downlink resource is managed to set certain limit, for example, the limitation to scheduling of resource, including avoids thousand from disturbing cell using the resource block for being likely to result in interference.The content of the invention
Because the downstream signal transmission of the microcell base station in heterogeneous network may be to the user terminal at macro base station edge（User Equipment, UE) bring very big interference；And for traditional coordinating district interference（ICIC) for method, due to the limitation for the running time-frequency resource that user terminal carries out data transmission can be scheduled to, to macro base station cell edge region and with the macro base station
Least partially overlapped each microcell base station jurisdiction district edge in overlay area transmitted using channeling, namely, the difficulty that fringe region and the running time-frequency resource orthogonal with each microcell base station jurisdiction district edge use that the overlay area of the macro base station is least partially overlapped to macro base station transmit data is very big, and reduces channeling gain.
In LTE, usually, Power Control is not used to downstream data channel.But, in heterogeneous network, by the limited amount for the user terminal that microcell base station is serviced, and the load distribution of the user terminal in microcell base station is typically more concentrated, again because the user terminal in microcell base station is to data transfer rate, the requirement of service quality may not be high, therefore, in order to solve the above-mentioned problems in the prior art, the present invention proposes the method and apparatus for being used to adjust transmission power in microcell base station, the transmission power of microcell base station is adjusted to an optimal value, to reduce the interference between macro base station and microcell base station, especially interference of the reduction microcell base station to macro base station.
According to the first aspect of the invention there is provided a kind of method for being used to adjust transmission power in microcell base station, wherein, the coverage of the microcell base station and macro base station is least partially overlapped, comprises the following steps：The first interference coordination configured information from the macro base station is obtained, the first interference coordination configured information is used to indicate the interference profile that the microcell base station is likely to result in the macro base station jurisdiction district；According to the first interference coordination configured information, transmission power Adjusted Option is determined.
According to the second aspect of the invention there is provided a kind of processing unit for being used to adjust transmission power in microcell base station, wherein, the coverage of the microcell base station and macro base station is least partially overlapped, including：First acquisition device, for obtaining the first interference coordination configured information from the macro base station, the first interference coordination configured information is used to indicating that the microcell base station is likely to result in the macro base station jurisdiction district thousand to disturb distribution；Determining device, for according to the first interference coordination configured information, determining transmission power Adjusted Option.
The technical scheme provided using the present invention, microcell base station can be transmitted using the transimission power of optimization to signaling and data, for example, reduction transmission power, therefore severe jamming will not be caused to the cell edge of macro base station and close to the user terminal of microcell base station.Preferably, by adjusting transmission power, microcell base station also will not produce interference to other adjacent microcell base station jurisdiction districts.
Brief description of the drawings
The following detailed description to non-limiting example is read by referring to accompanying drawing, other features, objects and advantages of the invention will become more apparent upon.
Fig. 1 shows the macro base station jurisdiction district in heterogeneous network and the topological structure schematic diagram of the administrative cell of microcell base station；
Fig. 2 shows the systems approach flow chart according to the specific embodiment of the present invention；Fig. 3 shows the systems approach flow chart of the another embodiment according to the present invention；
Fig. 4 shows the device block diagram according to the specific embodiment of the present invention.
Wherein, same or analogous reference represents same or analogous steps characteristic or device/module.Embodiment
Fig. 1 shows the macro base station jurisdiction district in heterogeneous network and the topological structure schematic diagram of the administrative cell of microcell base station.Microcell base station is also referred to as Home Node, including FemtoCell (femtocell, also referred to as Home eNodeB or 3G access points）, PicoCell, RRH (remote radios）, Relay (relayings）, the base station in Hot zone (hot spot region), be to provide for high-performance, it is more flexible, suitable in specific time or scene（For example, Highway, stadium）The less base station of transmission power of the small size of lower application.Because the transmission power of microcell base station is smaller, therefore, its coverage is smaller, for example, family is only covered, office etc..Figure 1 illustrates 1 macro base station 1, and 7 microcell base station 2a-2g in the coverage of macro base station 1.The 6 microcell base station 2a-2fs adjacent with microcell base station 2g are shown in Fig. 1.2 user terminals are also show in Fig. 1.Wherein, user terminal 3a is serviced by macro base station 1, and user terminal 3b is serviced by microcell base station 2a.
Brief description is carried out to the network design in heterogeneous network first, the deployment is completed by operator in the stage of arranging net.Resource type in heterogeneous network has a variety of, including time, frequency, pseudo noise code etc., without loss of generality, hereinafter illustrated by taking running time-frequency resource as an example.
>The design of reference signal
Signal for carrying out Interference Detection must be known, such as reference letter in LTE
Number（Reference signal, RS), namely pilot tone（) or leading symbol pilot（Preamble), can be exclusively used in DRS (Dedicated Reference Signal) or public reference signal that interference information is measured（common reference signal, CRS ).Usually, in the network design stage, microcell base station 2a knows the resource distributed for this microcell base station 2a（Resource allocation), therefore, based on the resource situation for distributing to microcell base station 2a, microcell base station 2a determines to use corresponding reference signal.For example when the frequency resource for distributing to microcell base station 2a is arrowband, for example it is only to include the subband of several Physical Resource Block, then microcell base station 2a can use the reference signal based on subband, and when the frequency resource for distributing to microcell base station 2a is broadband, then microcell base station 2a can use broadband-based reference signal.
In order to ensure that user terminal can be distinguished and detect the reference signal from different districts, Target cell, namely be desired with power adjustment cell reference signal shared by running time-frequency resource and neighbor cell（That is, thousand disturb cell）Reference signal shared by running time-frequency resource be orthogonal.The design of reference signal is illustrated exemplified by using the g of microcell base station 2 as Target cell, microcell base station 2g is orthogonal with the running time-frequency resource shared by adjacent 6 microcell base stations 2a, 2b, 2c, 2d, 2e, 2f and macro base station 1.One kind is simply achieved in that：Macro base station 1 takes specific resource particle（Resource Element, RE), remaining resource particle can distribute to microcell base station.The running time-frequency resource distributed by the reference signal of adjacent base station is different, represents three kinds of mutually orthogonal running time-frequency resources respectively with horizontal line, vertical line and oblique line.For example, the resource distributed by microcell base station 2g reference signal is represented with horizontal line, its 6 adjacent microcell base station is represented with vertical line or oblique line respectively.In addition, the interference between non-conterminous microcell base station is smaller, the running time-frequency resource that reference signal is distributed therefore, between non-conterminous microcell base station can be shared as.For example, non-conterminous microcell base station 2b, 2d, 2f can share same running time-frequency resource, represented with the vertical line in Fig. 1, non-conterminous microcell base station 2a, 2c, 2e can share same running time-frequency resource, be represented with the oblique line in Fig. 1.Certainly, the resource distributed to base station 2a-2g reference signal is different from the resource distributed by the reference signal of macro base station 1.
Fig. 2 shows the systems approach flow chart according to the specific embodiment of the present invention.For convenience of description, in Fig. 2 with macro base station 1, illustrated exemplified by microcell base station 2a, user terminal 3a and 3b, wherein, user terminal 3a is serviced by macro base station 1, user terminal
3b is serviced by microcell base station 2a, and user terminal 3a is located at the cell edge region of macro base station 1, and close to cell administrative microcell base station 2a.The region that the microcell base station 2a shown in Fig. 2 is covered is fallen completely within the region that macro base station 1 is covered, it will be appreciated by those skilled in the art that, may there is overlapping part with the region that multiple macro base stations are covered present invention is equally applicable to the partly overlapping situation in region that microcell base station and macro base station are each covered, and the region that a microcell base station is covered.In addition, it will be understood by those skilled in the art that the method flow shown in Fig. 2 is applied equally to other microcell base stations and macro base station and microcell base station in other heterogeneous networks.
We are first based on triggering with user terminal feedback interference relevant information（Event trigger) situation be described.First, in step S20, microcell base station 2a is desired with power adjustment, therefore, and microcell base station 2a sends interferometry configured information to user terminal 3a and user terminal 3b, and interferometry is carried out for indicating user terminal 3a and 3b.
The design of reference signal as previously described, the reference signal for being used for user terminal 3a and 3b progress interferometry that microcell base station 2a is sent to user terminal 3a and 3b can be the reference signal or public reference signal for being exclusively used in interferometry.Preferably, when user terminal feedback interference relevant information is based on triggering, microcell base station 2a can send the reference signal for being exclusively used in interferometry.In feedback interference relevant information under user terminal is based on triggering mode, user terminal can be fed back when needing to base station, also more flexible.
Receive thousand from microcell base station 2a disturb measurement configured information after, in step S21, user terminal 3a measurement interference-related informations, in step S21, in, user terminal 3b measurements thousand disturb relevant information.For example, user terminal 3a and 3b can be utilized respectively reference signal measurement interference-related information.Illustrated by taking user terminal 3a as an example.
User terminal 3a can obtain channel quality by reference to signal（ Channel Quality Indicator, CQI ).Then, in step S22, user terminal 3a feeds back to the CQI information as interference-related information the macro base station 1 for serving this user terminal 3a.For example, user terminal 3a is in the ascending resource that macro base station 1 is its distribution（UL grant) on, the interference-related information is sent to macro base station 1.Further, the CQI information fed back according to user terminal 3a, corresponding modulation coding mode can be determined by serving user terminal 3a macro base station 1（ Modulation and Coding Scheme, MCS ).Because specific CQI tool
Hold in vivo, acquisition and feedback system are provided in existing standard, therefore, will not be described here.
In the embodiment of a change, user terminal 3a can also be measured and be calculated its Reference Signal Received Power（ Reference Signal Receiving Power, RSRP ).For example, user terminal 3a knows the position of the reference signal of the cell belonging to it（Serving cell RS position), it can measure the intensity of the reference signal of this cell.When user terminal 3a knows the position of the reference signal of its neighbor cell, user terminal 3a measures the intensity of the reference signal of its adjacent cell.If user terminal 3a does not know the position of the reference signal of its neighbor cell, user terminal 3a detections likely correspond to the signal intensity of one or more positions of neighbor cell reference signal.Then, user terminal 3a can further calculate the ratio or difference of the Reference Signal Received Power of this cell and adjacent cell, the value is quantified, the value after quantization is then fed back into the macro base station 1 serviced for user terminal 3a as interference-related information in step S22.
Certainly, according to the measurement capability of user terminal, the interference-related information that user terminal is fed back can also include carrier receiver signal intensity and indicate（Carrier Received Signal Strength Indicator, RSSI), or Reference Signal Received Quality（Reference Signal Received Quality, RSRQ) etc. information.
Triggered above using event（Event triggered) mode, after the interferometry configured information from microcell base station 2a is received, user terminal 3a is just measured and feedback interference relevant information.Due in heterogeneous network, interferometry be it is very important, therefore, in the embodiment of a change, can also be using user terminal periodically to by the way of the feedback interference relevant information of macro base station 1, that is, the step S20 in Fig. 2 is dispensed.That is, periodically being indicated similar to user terminal 3a in LTE system to serving BS feedback channel quality, precoding matrix indicators and order instruction（Channel Quality Indicator, Precoding Matrix Indicator, Rank Indicator, CQI/PMI/RI) equally, user terminal 3a periodically feeds back thousand and disturbs relevant information.
It is above-described in step S21 and step S22, user terminal 3a measurement interference-related informations, and being described to the flow of the feedback of macro base station 1 information service for it.In step S21, and step S22, in, user terminal 3b measurements thousand disturb relevant information and feed back the information to for its microcell base station 2a serviced with step S21 and step S22 similarly.With
Described above is similarly, the interference-related information can also include CQI or RSRP, certainly, according to the measurement capability of user terminal, the interference-related information that user terminal is fed back can also include the information such as the instruction of carrier receiver signal intensity or Reference Signal Received Quality.Because step S21, and step S22, respectively with step S21 and step S22 all fours, therefore it will not be described here.
Then, in step S23, macro base station 1 generates the first interference coordination configured information according to the interference-related information for carrying out user terminal 3a.
When the thousand of user terminal 3a feedbacks disturbs the CQI that relevant information is user terminal 3a, macro base station 1 is to the CQI fed back according to user terminal 3a, estimate thousand from Micro-cell base station 2a that user terminal 3a is subject to and disturb situation, to generate the first interference coordination configured information.
When the user terminal 3a interference-related informations fed back are calculated obtained RSRP difference or ratio by user terminal 3a, macro base station 1 is directly according to the interference-related information, the disturbed condition from Micro-cell base station 2a that user terminal 3a is subject to is drawn, to generate the first interference coordination configured information.
The interference coordination configured information includes Relative Narrowband TX Power（Relative Narrowband Transmit Power, RNTP) configured information.The RNTP configured informations are used in the form of bit Map, indicate Physical Resource Block（Physical Resource Block, PRB) called situation.That is, whether some PRB is used, or launch for a long time without any signal, namely using 1 bit indicate whether the maximum transmission power on the PRB has exceeded some threshold value for each PRB（Such as thresholding is that base station is dispatched from the factory the x% of specified transmission power).Being specifically defined for RNTP refers to 3GPP Technical Specification 36.213, " Evolved Universal Terrestrial Radio Access (E-UTRA);Physical Layer Procedures (Release 8) ", www.3gpp.org will not be described here.
With step S23 similarly, in step S23, in, microcell base station 2a generates the second interference coordination configured information according to the interference-related information for carrying out user terminal 3b.
Then, when being connected between macro base station 1 and microcell base station 2a by X2 interface, in step s 24, macro base station 1 interacts the first interference coordination configured information and the second interference coordination configured information with microcell base station 2a.Certainly, except RNTP, load distribution situation of this cell etc. can also be included in the first and second interference coordination configured informations, in order to receive this
The base station of first or second interference coordination configured information determines interference coordination strategy.
Then, in step S25, in, microcell base station 2a determines power regulation scheme according to the first interference coordination configured information from macro base station 1, for example whether needing to adjust microcell base station 2a transmission power.For example, when the first interference coordination configured information indicates user terminals of the microcell base station 2a to the jurisdiction district edge of macro base station 1（Such as user terminal 2a) caused by interference be more than predetermined threshold when, then correspondingly, microcell base station 2a reduction transmission power；Or, when microcell base station 2a wishes to increase transmission power, but the first interference coordination configured information, when indicating that the interference that microcell base station 2a is caused to the user terminal at the jurisdiction district edge of base station 1 is big, microcell base station 2a does not increase transmission power；Or, microcell base station 2a wishes to increase transmission power, and the first interference coordination configured information indicates user terminals of the microcell base station 2a to the jurisdiction district edge of macro base station 1（Such as user terminal 2a) caused by interference be less than predetermined threshold when, then correspondingly, microcell base station 2a can increase transmission power.Certainly, the example of the above is nonrestrictive, and the scheme of microcell base station 2a specific power adjustment is not limited to above-mentioned example.The predetermined threshold can be chosen and be configured according to the experience of actual grid parameter and those skilled in the art.
Microcell base station 2a can set the option of one group of transmission power, such as with power to carry out power adjustment（On the basis of 18111- 6,-3, + 3,+6 (dBm)}.That is, on the basis of P dBm, step-length is 3dBm multiple performance numbers.When needing adjustment transmission power, microcell base station 2a can increase or reduce a stepping every time.Certainly, reference power value P, and step value can set and adjust.
As can be seen from Figure 1, user terminal 3a is located at the administrative cell edge of macro base station 1, and close to Micro-cell, in extreme circumstances, the interference signal from microcell base station 2a that user terminal 3a is received even can flood the useful signal from macro base station 1.Therefore, by adjusting microcell base station 2a transmission power, interference of the microcell base station 2a to user terminal 3a can be substantially reduced, meanwhile, very big influence is not resulted in yet to the user terminal in this microcell base station 2a jurisdiction districts.
In step S25, because macro base station 1 needs to consider the covering to the UE in cell edge and data transfer rate（Data rate), therefore, without downlink power control in macro base station 1.After macro base station 1 receives the second interference coordination configured information from microcell base station 2a, in order to avoid the interference to the cell in microcell base station, macro base station 1 can be provided
Coordinate in source, it is to avoid the UE (macro cell-edge UE) of the cell edge close to Micro-cell and positioned at macro base station 1 is dispatched in these resources.
Being shown in the step S24 of embodiment above when there is X2 interface between macro base station 1 and microcell base station 2a, the mode of first, second interference coordination configured information interaction is carried out between the two.When X2 interface is not present between macro base station 1 and microcell base station 2a, if the scheme for interacting these coordination informations using core net can cause the larger delay of coordination information.For example, when macro base station 1 wishes the first interference coordination configured information being sent to microcell base station 2a, first interference coordination configured information is needed via the gateway forwards being connected with macro base station 1 to core net, again by core net be transmitted to microcell base station 2a gateway in a network, then again by microcell base station 2a gateway forwards in a network give microcell base station 2a, because the repeating process of information is related to multiple network entities, therefore, the delay brought is very big.
Therefore, when under the network architecture between macro base station 1 and microcell base station 2a in the absence of X2 interface, air interface can be passed through（Over The Air, OTA) coordination configured information is disturbed by user terminal relaying the first and second thousand.Illustrated below by taking Fig. 3 as an example.In Fig. 3 because step S30, S31 and S32 respectively with step S20, S21 and S22 all fours in Fig. 2, and step S31,, step S32, respectively with step S21 in Fig. 2, step S22, all fours, therefore refuse to praise herein to state.In step S33, in, microcell base station 2a generates the second interference coordination configured information.Because using air interface transmission the second interference coordination configured information, in order to reduce OTA transmitted bits, reducing signaling consumption, microcell base station 2a can generate simplified interference coordination configured information.Still illustrated by taking RNTP information as an example.In the step S23 shown in Fig. 2, in, the RNTP information that microcell base station 2a is generated is based on PRB, that is, each PRB is used to indicate whether the maximum transmission power on the PRB has exceeded some threshold value using 1 bit.Because for microcell base station 2a, it is usually operated on subband, the part PRB in usable spectrum is only only taken up, therefore, the RNTP fed back in whole available band not only wastes bandwidth, and is also inaccurate.Therefore, in order to reflect that thousand in the frequency that a of microcell base station 2 is worked disturb situation exactly, in step S23, in, microcell base station 2a can be based on subband feedback RNTP.The RNTP information based on subband can be obtained for each PRB on subband, can also obtain a value for whole subband, then, the RNTP information of the simplification based on subband is disturbed coordination configured information as the 2000th and fed back by microcell base station 2a.
Similarly, in step S33, the first interference coordination configured information that macro base station 1 is generated can also be simplified, such as based on subband.
Then, in step S34 and S34, in, the first and second interference coordination configured informations are sent to user terminal 3a and user terminal 3b by macro base station 1 and microcell base station 2a respectively.In Fig. 3, for macro base station 1, it is user terminal from user terminal 3a to its feedback interference relevant information and the user terminal for its first interference coordination configured information of relaying, it is user terminal from user terminal 3b to its feedback interference relevant information and the user terminal for its second interference coordination configured information of relaying for microcell base station 2a.It will be appreciated by those skilled in the art that, it these are only example, in the embodiment of a change, for a base station, it is likely to and differs to the user terminal and the user terminal for its relaying interference coordination configured information of its feedback interference relevant information.And several user terminals may be used to relay interference coordination information for base station.
Moreover it is preferred that by macro base station 1 and the one or more user terminals of microcell base station 2a between the two, being used as the user terminal of the first interference coordination configured information of relaying or the second interference coordination configured information.
Then, in step S35 and step S35, in, microcell base station 2a and macro base station 1 are decomposed and intercepted（Overhear) the first and second interference coordination configured information.
Because step S36 is approximate with the step S25 shown in Fig. 2, Sudden S36 are walked, with the step S25 shown in Fig. 2, approximately, therefore, be will not be described here.
Fig. 4 shows the device block diagram according to the specific embodiment of the present invention.Processing unit 10 in Fig. 4 is located in microcellulor 2a.Processing unit 10 includes the first acquisition device 100 and determining device 101.Processing unit 10 also includes the second dispensing device 102, the second acquisition device 103, the dispensing device 105 of configured information generating means 104 and first.Wherein, only the first acquisition device 100 and determining device 101 are essential to the invention in order to implement.And the second dispensing device 102, the second acquisition device 103, the dispensing device 105 of configured information generating means 104 and first is the sub-device in the embodiment for corresponded to change, is optional.
It is based on event triggering that we first disturb relevant information with user terminal feedback thousand（Event trigger) situation be described.First, microcell base station 2a is desired with power adjustment, therefore, and the second dispensing device 102 sends to user terminal 3a and user terminal 3b ends and disturbed
Configured information is measured, the interferometry configured information measures for indicating user terminal 3a and user terminal 3b and reports the interference-related information.
The design of reference signal as previously described, the reference signal for being used for user terminal 3a and 3b progress interferometry that microcell base station 2a is sent to user terminal 3a and 3b can be the reference signal or public reference signal for being exclusively used in interferometry.Preferably, when it is based on triggering that user terminal feedback thousand, which disturbs relevant information, microcell base station 2a can send the reference signal for being exclusively used in interferometry.In feedback interference relevant information under user terminal is based on triggering mode, user terminal feedback can be fed back when needing to base station, also more flexible.
After the interferometry configured information from microcell base station 2a is received, relevant information is disturbed in user terminal 3a measurement interference-related informations, user terminal 3b measurements thousand.For example, user terminal 3a and 3b can be utilized respectively reference signal measurement interference-related information.Illustrated by taking user terminal 3b as an example.
User terminal 3b can obtain channel quality by reference to signal（ Channel Quality Indicator, CQI ).Then user terminal 3b feeds back to the CQI information as interference-related information the microcell base station 2a for serving this user terminal 3a.For example, user terminal 3b is in the ascending resource that microcell base station 2a is its distribution（UL grant) on, the interference-related information is sent to microcell base station 2a.Further, the CQI information fed back according to user terminal 3b, corresponding modulation coding mode can be determined by serving user terminal 3b microcell base station 2a（Modulation and Coding Scheme, MCS ).Because specific CQI particular content, acquisition and feedback system are provided in existing standard, therefore, it will not be described here.
In the embodiment of a change, user terminal 3b can also be measured and be calculated its Reference Signal Received Power（ Reference Signal Receiving Power, RSRP ).For example, user terminal 3b knows the position of the reference signal of the cell belonging to it（Serving cell RS position), it can measure the intensity of the reference signal of this cell.When user terminal 3b knows the position of the reference signal of its neighbor cell, user terminal 3b measures the intensity of the reference signal of its adjacent cell.If user terminal 3b does not know the position of the reference signal of its neighbor cell, user terminal 3b detects the signal intensity for likely corresponding to the one or more positions of neighbor cell reference signal.Then, can further to calculate this cell small with neighbour by user terminal 3b
The ratio or difference of the Reference Signal Received Power in area, quantify to the value, and the value after quantization then is fed back into the microcell base station 2a serviced for user terminal 3b as interference-related information.
Certainly, according to the measurement capability of user terminal, the interference-related information that user terminal is fed back can also include carrier receiver signal intensity and indicate（Carrier Received Signal Strength Indicator, RSSI), or Reference Signal Received Quality（Reference Signal Received Quality, RSRQ) etc. information.
Above by the way of event triggering (event triggered), after the interferometry configured information from microcell base station 2a is received, user terminal 3b is just measured and to microcell base station 2a feedback interference relevant informations.Due in heterogeneous network, interferometry be it is very important, therefore, in the embodiment of a change, can also be using user terminal periodically to by the way of microcell base station 2a feedback interference relevant informations, that is, the second dispensing device 102 in Fig. 4 is dispensed.Namely, periodically indicated similar to user terminal 3b in LTE system to serving BS feedback channel quality, precoding matrix indicators and order instruction (Channel Quality Indicator, Precoding Matrix Indicator, Rank Indicator, CQI/PMI/RI)-sample, user terminal 3b periodically feedback interference relevant informations.Therefore, the second acquisition device 103 obtains the interference-related information for carrying out user terminal 3b reports with being periodically or based upon event triggering.
Then, configured information generating means 104 disturb relevant information generation interference coordination configured information according to carry out user terminal 3b thousand.
When the interference-related information that user terminal 3b feeds back is user terminal 3b CQI, the CQI that configured information generating means 104 are fed back according to user terminal 3b, estimate the disturbed condition from macro base station 1 that user terminal 3b is subject to, indicate letter when the user terminal 3b interference-related informations fed back are calculated obtained RSRP difference or ratio by user terminal 3b to generate the second interference coordination, configured information generating means 104 are directly according to the interference-related information, draw the disturbed condition from macro base station 1 that user terminal 3b is subject to, to generate the second interference coordination configured information.
The interference coordination configured information includes Relative Narrowband TX Power（Relative Narrowband Transmit Power, RNTP) configured information.The RNTP configured informations
For in the form of bit Map, indicating Physical Resource Block（Physical Resource Block, PRB) called situation.That is, whether some PRB is used, or launch for a long time without any signal, namely using 1 bit indicate whether the maximum transmission power on the PRB has exceeded some threshold value for each PRB（Such as thresholding is that base station is dispatched from the factory the x% of specified transmission power).Being specifically defined for RNTP refers to 3GPP Technical Specification 36.213, " Evolved Universal Terrestrial Radio Access (E-UTRA);Physical Layer Procedures (Release 8) ", www.3gpp.org, refuse to praise and state in jH.
Then, when being connected between macro base station 1 and microcell base station 2a by X2 interface, the second interference coordination configured information generated by configured information generating means 104 is sent to macro base station 1 by the first dispensing device 105.Certainly, except RNTP, load distribution situation of this cell etc. can also be included in the first and second interference coordination configured informations, in order to which the base station for receiving the first or second interference coordination configured information determines interference coordination strategy.
In addition, the first acquisition device 100 obtains the first interference coordination configured information from macro base station 1, the first interference coordination configured information is used to indicate the interference profile that microcell base station 2a is likely to result in macro base station 1, it may for example comprise RNTP quantized values.
Shown in embodiment above when there is X2 interface between macro base station 1 and microcell base station 2a, first acquisition device 100 directly obtains the first interference coordination configured information from macro base station 1 by X2 interface, and the second interference coordination configured information is directly sent to macro base station 1 by the first dispensing device 105 by X2 interface.When macro base station 1 and microcell base station
When X2 interface is not present between 2a, if the scheme for interacting these coordination informations using core net can cause the larger delay of coordination information.For example, when macro base station 1 wishes the first interference coordination configured information being sent to microcell base station 2a, first interference coordination configured information is needed via the gateway forwards being connected with macro base station 1 to core net, again by core net be transmitted to microcell base station 2a gateway in a network, then again by microcell base station 2a gateway forwards in a network give microcell base station 2a, because the repeating process of information is related to multiple network entities, therefore, the delay brought is very big.
Therefore, air interface can be passed through in the absence of under the network architecture of X2 interface between macro base station 1 and microcell base station 2a（Over The Air, OTA) the first and second interference coordination configured informations are relayed by user terminal.The generation second of configured information generating means 104 is dry
Disturb coordination configured information.Because using air interface transmission the second interference coordination configured information, in order to reduce OTA transmitted bits, reducing signaling consumption, configured information generating means 104 can generate simplified interference coordination configured information.Still illustrated by taking RNTP information as an example.When having X2 interface between microcell base station 2a and macro base station 1, the RNTP information that microcell base station 2a is generated can be based on PRB, that is, being used to indicate whether the maximum transmission power on the PRB has exceeded some threshold value using 1 bit with each PRB.Because for microcell base station 2a, it is usually operated on subband, the part PRB in usable spectrum is only only taken up, therefore, the RNTP fed back in whole available band not only wastes bandwidth, and is also inaccurate.Therefore, in order to reflect the disturbed condition in the frequency that microcell base station 2a is worked exactly, configured information generating means 104 can be based on subband feedback RNTP.The RNTP information based on subband can be obtained for each PRB on subband, can also obtain a value for whole subband, then, configured information generating means 104 are fed back the RNTP information of the simplification based on subband as the second interference coordination configured information.
Then, the second interference coordination configured information is sent to user terminal 3b by the first dispensing device 105, and the second interference coordination configured information is sent into the second interference coordination configured information to up again from user terminal 3b.
In the absence of under the network architecture of X2 interface between macro base station 1 and microcell base station 2a, the first acquisition device 100 is by intercepting（Overhear) the first interference coordination configured information.
Then, it is determined that device 101 disturbs coordination configured information according to the 1000th from macro base station 1, power regulation scheme is determined, for example whether needing to adjust microcell base station 2a transmission power.For example, when the first interference coordination configured information indicates user terminals of the microcell base station 2a to the jurisdiction district edge of macro base station 1（Such as user terminal 2a) caused by interference be more than make a reservation for wealthy value when, then correspondingly, microcell base station 2a reduction transmission power；Or, when microcell base station 2a wishes to increase transmission power, but the first interference coordination configured information indicate that microcell base station 2a causes to the user terminal at the jurisdiction district edge of base station 1 thousand when disturbing big, microcell base station 2a does not increase transmission power；Or, microcell base station 2a wishes to increase transmission power, and the 1000th disturbs the user terminal for coordinating configured information instruction microcell base station 2a to the jurisdiction district edge of macro base station 1（Such as user terminal 2a) caused by interference be less than predetermined threshold when, then correspondingly, microcell base station 2a can increase transmission power.The selection of the predetermined threshold can
With the experience according to actual grid parameter and those skilled in the art, configured.Microcell base station 2a can set the option of one group of transmission power to carry out power adjustment, such as { P-6, P-3, P, P+3, P+6 (dBm) } on the basis of power P dBm.That is, on the basis of P dBm, step-length is 3dBm multiple performance numbers.When needing adjustment transmission power, microcell base station 2a can increase or reduce a stepping every time.Certainly, reference power value P, and step value can set and adjust.
It should be noted that above-described embodiment is only exemplary, rather than limitation of the present invention.Any technical scheme without departing substantially from spirit of the present invention all should be fallen under the scope of the present invention, and this can be combined including the use of the different technologies feature occurred in different embodiments, dispatching method, to obtain beneficial effect.In addition, any reference in claim should not be considered as to the claim involved by limitation；" including " word is not excluded for device unlisted in other claims or specification or step；" one " before device is not excluded for the presence of multiple such devices；In the equipment comprising multiple devices, the function of one or more of the plurality of device can be realized by same hardware or software module；" first ", " second,, the word such as " the 3rd " be only used for representing title, and be not offered as any specific order.
Claims (15)
- Claims1. a kind of method for being used to adjust transmission power in microcell base station, wherein, the coverage of the microcell base station and macro base station is least partially overlapped, comprises the following steps：1. obtaining the first interference coordination configured information from the macro base station, the first interference coordination configured information is used to indicate the interference profile that the microcell base station is likely to result in the macro base station jurisdiction district；II. according to the first interference coordination configured information, transmission power Adjusted Option is determined.2. according to the method described in claim 1, wherein, when the microcell base station is connected with the macro base station by X2 interface, the step I also includes：By the X2 interface, the first interference coordination configured information is obtained；Or, when the X2 interface is not present between the microcell base station and the macro base station, the step I also includes：Obtain the first interference coordination configured information from the macro base station, being forwarded by least one user terminal.3. method according to claim 1 or 2, wherein, also include before the step II：A. the interference-related information of one or more user terminal reports is obtained；B. according to the interference-related information, the second interference coordination configured information is generated；C. the second interference coordination configured information is sent to the macro base station, wherein, the second interference coordination configured information is used to carry out interference coordination by the macro base station.4. method according to claim 3, wherein, the step B also includes：According to the interference-related information, and the subband worked based on the microcell base station, generate the second interference coordination configured information based on subband.5. the method according to claim 3 or 4, wherein, when the microcell base station is connected with the macro base station by X2 interface, the step C also includes：By the X2 interface, the second interference coordination configured information is sent to the macro base station；Or, when X2 interface is not present between the microcell base station and the macro base station, the step C also includes： If disturb coordination configured information by the described 2000th is sent to the macro base station by thousand user terminals.6. the method according to any one of claim 3 to 5, when the microcell base station wishes adjustment transmission power, also includes before the step A：- interferometry configured information is sent to the user terminal, the interferometry configured information is used to indicate at least one described user terminal measurement and reports the interference-related information.7. method according to any one of claim 1 to 6, wherein, the step II also includes：- when the described 1000th disturb coordinate the interference that configured information indicates that the microcell base station is formed to the macro base station jurisdiction district be more than make a reservation for wealthy value when, it is determined that reducing the transmission power；- otherwise, keep or increase the transmission power.8. the method according to any one of claim 2 to 7, wherein, the interference-related information includes the Reference Signal Received Power of channel shield amount information or quantization, and the first interference coordination configured information includes any one of the following or appointed multinomial：The Relative Narrowband TX Power of-the macro base station；The Relative Narrowband TX Power of-the macro base station and the load distribution of the macro base station cell；And/or the second interference coordination configured information includes any one of the following or appointed multinomial：The Relative Narrowband TX Power of-the microcell base station；The Relative Narrowband TX Power of-the microcell base station and the load distribution of the microcell base station cell.9. a kind of processing unit for being used to adjust transmission power in microcell base station, wherein, the coverage of the microcell base station and macro base station is least partially overlapped, including：First acquisition device, the 1000th disturbs coordination configured information, the first interference coordination configured information is used to indicate the interference profile that the microcell base station is likely to result in the macro base station jurisdiction district for obtaining from the macro base station；Determining device, for according to the first interference coordination configured information, determining transmission power Adjusted Option.10. processing unit according to claim 9, wherein, when the microcell base station is connected with the macro base station by X2 interface, first acquisition device is additionally operable to：By the X2 interface, the first interference coordination configured information is obtained；Or, when the X2 interface is not present between the microcell base station and the macro base station, first acquisition device is additionally operable to：Obtain it is from the macro base station, the described 1000th disturb coordination configured information by what at least one user terminal was forwarded.11. the processing unit according to claim 9 or 10, wherein, in addition to：Second acquisition device, the interference-related information for obtaining one or more user terminal reports；Configured information generating means, for disturbing relevant information according to described thousand, generate the second interference coordination configured information；First dispensing device, for the second interference coordination configured information to be sent into the macro base station, wherein, the second interference coordination configured information is used to carry out interference coordination by the macro base station.12. the processing unit according to claim 11, wherein, the configured information generating means are additionally operable to：According to the interference-related information, and the subband worked based on the microcell base station, generate the second interference coordination configured information based on subband.13. the processing unit according to claim 11 or 12, wherein, when the microcell base station is connected with the macro base station by X2 interfaces, first dispensing device is additionally operable to：By the X2 interface, the second interference coordination configured information is sent to the macro base station；Or, when X2 interface is not present between the microcell base station and the macro base station, first dispensing device is additionally operable to：The second interference coordination configured information is sent to the macro base station by several user terminals.14. the processing unit according to any one of claim 11 to 13, when the microcell base station wishes adjustment transmission power, the processing unit also includes：Second dispensing device, for sending interferometry configured information to the user terminal, The interferometry configured information is used to indicate at least one described user terminal measurement and reports the interference-related information.15. the processing unit according to any one of claim 9 to 14, wherein, the determining device is additionally operable to：- when the first interference coordination configured information indicates that thousand that the microcell base station formed to the macro base station jurisdiction district are disturbed more than wealthy value is made a reservation for, it is determined that reducing the transmission power；- otherwise, keep or increase the transmission power.
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| PCT/CN2010/070679 WO2011097822A1 (en) | 2010-02-12 | 2010-02-12 | Method and apparatus for controlling power of micro cell base station |
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| CN102687565B (en) | 2015-06-10 |
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