CN102687565B - 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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- CN102687565B CN102687565B CN201080059700.8A CN201080059700A CN102687565B CN 102687565 B CN102687565 B CN 102687565B CN 201080059700 A CN201080059700 A CN 201080059700A CN 102687565 B CN102687565 B CN 102687565B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- 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
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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
Technical field
The present invention relates to heterogeneous network, particularly relate to and the power of the microcell base station in heterogeneous network is controlled.
Background technology
At present, heterogeneous network (Heterogeneous Networks is called for short HTN) technology is considered within the scope of research by LTE-A (Long Term Evolution Advanced) standard.So-called heterogeneous network, comprises multiple base station (such as macro base station and other microcell base stations etc.) exactly, and at least part of overlapping network in region that these base stations cover.For HTN system, its important application is incorporated in traditional cellular cell by microcell base station (Home eNodeB is called for short HeNB), 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, usually there is the community (in Fig. 1 seven cellular regions) served by multiple microcell base station 2a, 2b, 2c, 2d, 2e, 2f, 2g within the cellular cell (elliptical region maximum in Fig. 1) that macro base station 1 (Macro eNodeB) is served.Because the through-put power of microcell base station is lower, so the coverage of microcell base station is more much smaller than the macro base station of cellular cell.
Because region that macro base station and microcell base station cover exists overlapping part, therefore, coordinating district interference problem is the main problem of in heterogeneous network.So far, having the method for three kinds of main reduction presence of intercell interference, is interference randomization respectively, AF panel and interference coordination (Inter Cell Interference Cancellation, ICIC).Traditional interference coordination technique arranges certain limit to downlink resource management, such as, to the restriction of scheduling of resource, comprises and avoid interference the Resource Block that community use may cause interference.
Summary of the invention
Because the downstream signal transmission of the microcell base station in heterogeneous network may bring very large interference to the user terminal at macro base station edge (User Equipment, UE); And for traditional coordinating district interference (ICIC) method, due to the limitation of the running time-frequency resource carrying out transfer of data to user terminal can be dispatched, channeling is all adopted to transmit to macro base station cell edge region and each edge, microcell base station jurisdiction district overlapping at least partly with the overlay area of this macro base station, also be, all adopt orthogonal running time-frequency resource transmit the difficulty of data very greatly to the fringe region of macro base station and each edge, microcell base station jurisdiction district overlapping at least partly with the overlay area of this macro base station, and reduce channeling gain.
In LTE, usually, power is not adopted to control to downstream data channel.But, in heterogeneous network, due to the limited amount of the user terminal that microcell base station is served, and the load diatibution of user terminal in microcell base station is generally comparatively 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 in microcell base station for adjusting the method and apparatus of transmitting power, the transmitting power of microcell base station is adjusted to an optimal value, to reduce the interference between macro base station and microcell base station, especially microcell base station is reduced to the interference of macro base station.
According to a first aspect of the invention, provide a kind of in microcell base station for adjusting the method for transmitting power, wherein, described microcell base station is overlapping at least partly with the coverage of macro base station, comprise the following steps: obtain the first interference coordination indication information from described macro base station, described first interference coordination indication information is used to indicate the interference profile that described microcell base station may cause described macro base station jurisdiction district; According to described first interference coordination indication information, determine transmitting power Adjusted Option.
According to a second aspect of the invention, provide a kind of in microcell base station for adjusting the processing unit of transmitting power, wherein, described microcell base station is overlapping at least partly with the coverage of macro base station, comprise: the first acquisition device, for obtaining the first interference coordination indication information from described macro base station, described first interference coordination indication information is used to indicate the interference profile that described microcell base station may cause described macro base station jurisdiction district; Determining device, for according to described first interference coordination indication information, determines transmitting power Adjusted Option.
Adopt technical scheme provided by the invention, microcell base station can adopt the through-put power of optimization to transmit signaling and data, such as, reduce transmitting power, therefore can not cause severe jamming to the cell edge of macro base station and near the user terminal of microcell base station.Preferably, by adjustment transmitting power, microcell base station also can not produce interference to other adjacent microcell base station jurisdiction districts.
Accompanying drawing explanation
Read the following detailed description to non-limiting example by referring to accompanying drawing, other features, objects and advantages of the present invention will become more obvious.
Fig. 1 shows the topological structure schematic diagram of macro base station jurisdiction district in heterogeneous network and the administrative community of microcell base station;
Fig. 2 shows the systems approach flow chart according to a specific embodiment of the present invention;
Fig. 3 shows the systems approach flow chart according to another embodiment of the present invention;
Fig. 4 shows the device block diagram according to a specific embodiment of the present invention.
Wherein, same or analogous Reference numeral represents same or analogous steps characteristic or device/module.
Embodiment
Fig. 1 shows the topological structure schematic diagram of macro base station jurisdiction district in heterogeneous network and the administrative community of microcell base station.Microcell base station is also referred to as Home Node, comprise FemtoCell (femtocell, also Home eNodeB or 3G access point is referred to as), PicoCell, RRH (remote radio), Relay (relaying), base station in Hot zone (hot spot region), to provide high-performance, more flexibly, being applicable to the less base station of the transmitting power of the small size of application under specific time or scene (such as, Highway, stadium).Because the transmitting power of microcell base station is less, therefore, its coverage is less, such as, only covers family, office etc.Figure 1 illustrates 1 macro base station 1, and 7 microcell base station 2a-2g in the coverage of macro base station 1.6 the microcell base station 2a-2fs adjacent with microcell base station 2g have been shown in Fig. 1.Also show 2 user terminals in Fig. 1.Wherein, user terminal 3a is served by macro base station 1, and user terminal 3b is served by microcell base station 2a.
First carry out concise and to the point description to the network design in heterogeneous network, this deployment is completed in the stage of arranging net by operator.Resource type in heterogeneous network has multiple, comprises time, frequency, pseudo noise code etc., without loss of generality, is hereinafter all described for running time-frequency resource.
the design of reference signal
Must be known for carrying out the signal of Interference Detection, such as, reference signal (reference signal in LTE, RS), also be pilot tone (pilot) or leading symbol (preamble), it can be the DRS (Dedicated Reference Signal) being exclusively used in interfere information measurement, also can be public reference signal (common reference signal, CRS).Usually, in the network design stage, microcell base station 2a knows the resource (resourceallocation) for this microcell base station 2a distributes, therefore, based on the resource situation distributing to microcell base station 2a, microcell base station 2a determines to adopt corresponding reference signal.Such as when the frequency resource distributing to microcell base station 2a is arrowband, it is only such as the subband comprising several Physical Resource Block, then microcell base station 2a can adopt the reference signal based on subband, and when the frequency resource distributing to microcell base station 2a is broadband, then microcell base station 2a can adopt broadband-based reference signal.
In order to ensure that user terminal can be distinguished and detect the reference signal from different districts, Target cell, also namely wish to carry out the running time-frequency resource shared by reference signal of the community of power adjustment and the running time-frequency resource shared by reference signal of neighbor cell (also namely, interfered cell) is orthogonal.Be described the design of reference signal for microcell base station 2g as Target cell, this 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.A kind of simple implementation is: macro base station 1 takies specific resource particle (Resource Element, RE), and remaining resource particle can distribute to microcell base station.The running time-frequency resource distributed for 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.Such as, the resource that the reference signal for microcell base station 2g is distributed represents with horizontal line, and its 6 adjacent microcell base stations represent with vertical line or oblique line respectively.In addition, the interference between non-conterminous microcell base station is less, therefore, can be shared as the running time-frequency resource that reference signal is distributed between non-conterminous microcell base station.Such as, non-conterminous microcell base station 2b, 2d, 2f can share same running time-frequency resource, represent with the vertical line in Fig. 1, and non-conterminous microcell base station 2a, 2c, 2e can share same running time-frequency resource, represent with the oblique line in Fig. 1.Certainly, the resource of distributing to the reference signal of base station 2a-2g is all different from the resource that the reference signal for macro base station 1 is distributed.
Fig. 2 shows the systems approach flow chart according to a specific embodiment of the present invention.For convenience of explanation, with macro base station 1 in Fig. 2, microcell base station 2a, user terminal 3a and 3b are that example is described, wherein, user terminal 3a is served by macro base station 1, user terminal 3b is served by microcell base station 2a, and user terminal 3a is positioned at the cell edge region of macro base station 1, and the community that close microcell base station 2a is administrative.The region that microcell base station 2a shown in Fig. 2 covers falls within the region that macro base station 1 covers completely, it will be appreciated by those skilled in the art that, the present invention is applicable to the overlapping situation of the microcell base station area part covered separately with macro base station too, and may all there be overlapping part in the region that microcell base station covers with the region that multiple macro base station covers.In addition, it will be understood by those skilled in the art that the method flow shown in Fig. 2 is applicable to macro base station in other microcell base stations and other heterogeneous networks and microcell base station too.
We are first is be described based on the situation triggering (event trigger) with user terminal feedback interference relevant information.First, in step S20, microcell base station 2a wishes to carry out power adjustment, and therefore, microcell base station 2a sends interferometry indication information to user terminal 3a and user terminal 3b, is used to indicate user terminal 3a and 3b and carries out interferometry.
The design of reference signal as previously described, microcell base station 2a sends to the reference signal of carrying out interferometry for user terminal 3a and 3b of user terminal 3a and 3b can be the reference signal being exclusively used in interferometry, also can be public reference signal.Preferably, when user terminal feedback interference relevant information is based on triggering, microcell base station 2a can send the reference signal being exclusively used in interferometry.At user terminal based under triggering mode during feedback interference relevant information, user terminal can feed back to base station when needs, also more flexible.
After receiving the interferometry indication information from microcell base station 2a, in the step s 21, user terminal 3a measurements interference relevant information, in step S21 ', user terminal 3b measurements interference relevant information.Such as, user terminal 3a and 3b can utilize reference signal measurements interference relevant information respectively.Be described for user terminal 3a.
User terminal 3a by reference to signal, can obtain channel quality (Channel QualityIndicator, CQI).Then, in step S22, this CQI information is fed back to the macro base station 1 of serving this user terminal 3a as interference-related information by user terminal 3a.Such as, on the ascending resource (UL grant) that user terminal 3a distributes for it at macro base station 1, this interference-related information is sent to macro base station 1.Further, according to the CQI information that user terminal 3a feeds back, the macro base station 1 of serving user terminal 3a can determine corresponding modulation coding mode (Modulation and Coding Scheme, MCS).Because the particular content of concrete CQI, acquisition and feedback system specify in existing standard, therefore, do not repeat them here.
In the execution mode of a change, user terminal 3a can also measure and calculate its Reference Signal Received Power (Reference Signal Receiving Power, RSRP).Such as, user terminal 3a knows the position (serving cell RSposition) of the reference signal of the community belonging to it, and it can measure the intensity of the reference signal of this community.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 when user terminal 3a does not know the position of the reference signal of its neighbor cell, user terminal 3a detects the signal strength signal intensity that may correspond to one or more positions of neighbor cell reference signal.Then, user terminal 3a can calculate ratio or the difference of the Reference Signal Received Power of this community and adjacent cell further, this value is quantized, then using quantize after value as interference-related information, feed back in step S22 for user terminal 3a serve macro base station 1.
Certainly, according to the measurement capability of user terminal, the interference-related information that user terminal feeds back also can comprise carrier receiver signal strength signal intensity instruction (Carrier Received SignalStrength Indicator, RSSI), or the information such as Reference Signal Received Quality (Reference SignalReceived Quality, RSRQ).
More than adopt event to trigger the mode of (event triggered), after receiving the interferometry indication information from microcell base station 2a, user terminal 3a just measures and feedback interference relevant information.Due in heterogeneous network, interferometry is very important, and therefore, in the execution mode of a change, also can adopt user terminal periodically to the mode of macro base station 1 feedback interference relevant information, also, the step S20 in Fig. 2 is omissible.Also be, be similar to user terminal 3a in LTE system periodically to indicate to serving BS feedback channel quality, precoding matrix indicators and order instruction (Channel Quality Indicator, Precoding Matrix Indicator, Rank Indicator, CQI/PMI/RI) the same, user terminal 3a is feedback interference relevant information periodically.
Above-described in step S21 and step S22, user terminal 3a measurements interference relevant information, and the flow process that the macro base station 1 of Xiang Weiqi service feeds back this information is described.In step S21 ' and step S22 ', with step S21 and step S22 similarly, user terminal 3b measurements interference relevant information and Xiang Weiqi service microcell base station 2a feed back this information.With description above similarly, this interference-related information also can comprise CQI or RSRP, certainly, according to the measurement capability of user terminal, the interference-related information that user terminal feeds back also can comprise the information such as the instruction of carrier receiver signal strength signal intensity or Reference Signal Received Quality.Because step S21 ' and step S22 ' respectively with step S21 and step S22 all fours, therefore do not repeat them here.
Then, in step S23, macro base station 1 generates the first interference coordination indication information according to the interference-related information carrying out user terminal 3a.
When the interference-related information that user terminal 3a feeds back is the CQI of user terminal 3a, macro base station 1 is to the CQI fed back according to user terminal 3a, estimate the disturbed condition from base station, Micro-cell 2a that user terminal 3a is subject to, to generate the first interference coordination indication information.
When difference or the ratio of the RSRP that the interference-related information that user terminal 3a feeds back calculates for user terminal 3a, macro base station 1 is directly according to this interference-related information, draw the disturbed condition from base station, Micro-cell 2a that user terminal 3a is subject to, to generate the first interference coordination indication information.
This interference coordination indication information comprises Relative Narrowband TX Power (RelativeNarrowband Transmit Power, RNTP) indication information.This RNTP indication information is used for the form of bit Map, instruction Physical Resource Block (Physical Resource Block, PRB) invoked situation.Also be, whether certain PRB is employed, or to launch without any signal for a long time, also namely adopt 1 bit to indicate the maximum transmission power on this PRB whether to exceed certain threshold value (if this thresholding dispatches from the factory the x% of specified transmitting power in base station) for each PRB.The concrete definition of RNTP refers to 3GPP Technical Specification36.213, " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures (Release8) ",
www.3gpp.org, do not repeat them here.
With step S23 similarly, in step S23 ', microcell base station 2a generates the second interference coordination indication information according to the interference-related information carrying out user terminal 3b.
Then, when being connected by X2 interface between macro base station 1 with microcell base station 2a, in step s 24 which, macro base station 1 and the mutual first interference coordination indication information of microcell base station 2a and the second interference coordination indication information.Certainly, except RNTP, the load Distribution situation etc. of this community can also be comprised in the first and second interference coordination indication informations, so that interference coordination strategy is determined in the base station receiving this first or second interference coordination indication information.
Then, in step S25 ', microcell base station 2a, according to the first interference coordination indication information from macro base station 1, determines power regulation scheme, such as, the need of the transmitting power of adjustment microcell base station 2a.Such as, when the interference that the user terminal (such as user terminal 2a) of the first interference coordination indication information instruction microcell base station 2a to edge, macro base station 1 jurisdiction district causes is greater than predetermined threshold, then correspondingly, microcell base station 2a reduces transmitting power; Or when microcell base station 2a wishes to increase transmitting power, but when the interference that indicates the user terminal of this microcell base station 2a to edge, jurisdiction district, base station 1 to cause of the first interference coordination indication information is large, microcell base station 2a does not increase transmitting power; Or, microcell base station 2a wishes to increase transmitting power, and the interference that the first interference coordination indication information instruction user terminal (such as user terminal 2a) of microcell base station 2a to edge, macro base station 1 jurisdiction district causes is when being less than predetermined threshold, then correspondingly, microcell base station 2a can increase transmitting power.Certainly, above example is nonrestrictive, and the scheme of the concrete power adjustment of microcell base station 2a is not limited to above-mentioned example.This predetermined threshold can carry out choosing and configuring according to the experience of the grid parameter of reality and those skilled in the art.
Microcell base station 2a, in order to carry out power adjustment, can arrange the option of one group of transmitting power, such as, with { P-6, P-3, P, P+3, P+6 (dBm) } that power P dBm is benchmark.Also namely, be benchmark with P dBm, step-length is multiple performance numbers of 3dBm.When needs adjustment transmitting power, microcell base station 2a can increase at every turn or reduce a stepping.Certainly, this reference power value P, and step value all can set and adjust.
As can be seen from Figure 1, user terminal 3a is positioned at the administrative cell edge of macro base station 1, and near Micro-cell, in extreme circumstances, the interference signal from microcell base station 2a that user terminal 3a receives even can flood the useful signal from macro base station 1.Therefore, by the transmitting power of adjustment microcell base station 2a, greatly can reduce the interference of microcell base station 2a to user terminal 3a, meanwhile, also can not cause very large impact to the user terminal in this microcell base station 2a jurisdiction district.
In step s 25, because macro base station 1 needs to consider the covering to the UE being in cell edge and data transfer rate (data rate), therefore, in macro base station 1, downlink power control is not carried out.When after the second interference coordination indication information that macro base station 1 receives from microcell base station 2a, in order to avoid the interference to the community in microcell base station, macro base station 1 can carry out resource coordination, avoids in these resources, dispatch close Micro-cell and the UE (macro cell-edge UE) being positioned at the cell edge of macro base station 1.
Illustrate when there is X2 interface between macro base station 1 and microcell base station 2a in the step S24 of above execution mode, carried out the mutual mode of first, second interference coordination indication information between the two.When there is not X2 interface between macro base station 1 and microcell base station 2a, if adopt the scheme of core net these harmony messages mutual can cause the larger time delay of harmony messages.Such as, when macro base station 1 wishes the first interference coordination indication information to be sent to microcell base station 2a, first interference coordination indication information needs via the gateway forwards be connected with macro base station 1 to core net, again by core net be transmitted to microcell base station 2a gateway in a network, and then by microcell base station 2a gateway forwards in a network to microcell base station 2a, because the repeating process of information relates to multiple network entity, therefore, the delay brought is very large.
Therefore, when under the network architecture that there is not X2 interface between macro base station 1 and microcell base station 2a, air interface (Over The Air, OTA) can be passed through by user terminal relaying first and second interference coordination indication information.Be described for Fig. 3 below.In figure 3 because step S30, S31 and S32 respectively with the step S20 in Fig. 2, S21 and S22 all fours, and step S31 ', step S32 ' respectively with step S21 ', step S22 ' all fours in Fig. 2, therefore do not repeat them here.In step S33 ', microcell base station 2a generates the second interference coordination indication information.Because adopt air interface transmission second interference coordination indication information, in order to reduce OTA transmitted bit, reduce signaling consumption, microcell base station 2a can generate the interference coordination indication information of simplification.Still be described for RNTP information.In the step S23 ' shown in Fig. 2, the RNTP information that microcell base station 2a generates is based on PRB, and also, whether the maximum transmission power that each PRB adopts 1 bit to be used to indicate on this PRB has exceeded certain threshold value.Because for microcell base station 2a, it is usually operated on subband, only takies the part PRB in usable spectrum, and therefore, the RNTP fed back in whole available band not only wastes bandwidth, and is inaccurate.Therefore, in order to reflect the disturbed condition in the frequency that microcell base station 2a works exactly, in step S23 ', microcell base station 2a can based on subband feedback RNTP.Can should be obtain for each PRB on subband based on the RNTP information of subband, also can be obtain a value for whole subband, then, microcell base station 2a, by this RNTP information based on the simplification of subband, feeds back as the second interference coordination indication information.
Similarly, in step S33, the first interference coordination indication information that macro base station 1 generates also can be simplify, such as, based on subband.
Then, in step S34 and S34 ', the first and second interference coordination indication informations are sent to user terminal 3a and user terminal 3b by macro base station 1 and microcell base station 2a respectively.In figure 3, for macro base station 1, user terminal to its feedback interference relevant information is user terminal 3a with the user terminal for its relaying first interference coordination indication information, for microcell base station 2a, the user terminal to its feedback interference relevant information is user terminal 3b with the user terminal for its relaying second interference coordination indication information.It will be understood by those skilled in the art that and these are only example, in the execution mode of a change, for a base station, the user terminal to its feedback interference relevant information is probably not identical with the user terminal for its relaying interference coordination indication information.And several user terminals may be adopted to be base station relaying interference coordination information.
In addition, preferably, by macro base station 1 and microcell base station 2a one or more user terminals between the two, as the user terminal of relaying first interference coordination indication information or the second interference coordination indication information.
Then, in step S35 and step S35 ', microcell base station 2a and macro base station 1 decompose intercepts (overhear) the first and second interference coordination indication information.
Because the step S25 shown in step S36 and Fig. 2 is similar to, step S36 ' is similar to the step S25 ' shown in Fig. 2, therefore, does not repeat them here.
Fig. 4 shows the device block diagram according to a specific embodiment of the present invention.Processing unit 10 in Fig. 4 is arranged in microcellulor 2a.Processing unit 10 comprises the first acquisition device 100 and determining device 101.Processing unit 10 also comprises the second dispensing device 102, second acquisition device 103, indication information generating apparatus 104 and the first dispensing device 105.Wherein, the first acquisition device 100 and determining device 101 is only had to be essential to the invention in order to implement.And the second dispensing device 102, second acquisition device 103, the sub-device in the execution mode of indication information generating apparatus 104 and the first dispensing device 105 change that has been all corresponding is optional.
We are first that the situation triggering (eventtrigger) based on event is described with user terminal feedback interference relevant information.First, microcell base station 2a wishes to carry out power adjustment, therefore, the second dispensing device 102 is held to user terminal 3a and user terminal 3b and is sent interferometry indication information, and described interferometry indication information is used to indicate user terminal 3a and user terminal 3b and measures and report described interference-related information.
The design of reference signal as previously described, microcell base station 2a sends to the reference signal of carrying out interferometry for user terminal 3a and 3b of user terminal 3a and 3b can be the reference signal being exclusively used in interferometry, also can be public reference signal.Preferably, when user terminal feedback interference relevant information is based on triggering, microcell base station 2a can send the reference signal being exclusively used in interferometry.At user terminal based under triggering mode during feedback interference relevant information, user terminal feedback can be fed back to base station when needs, also more flexible.
After receiving the interferometry indication information from microcell base station 2a, user terminal 3a measurements interference relevant information, user terminal 3b measurements interference relevant information.Such as, user terminal 3a and 3b can utilize reference signal measurements interference relevant information respectively.Be described for user terminal 3b.
User terminal 3b by reference to signal, can obtain channel quality (Channel QualityIndicator, CQI).Then this CQI information is fed back to as interference-related information the microcell base station 2a serving this user terminal 3a by user terminal 3b.Such as, user terminal 3b is on its ascending resource (UL grant) distributed at microcell base station 2a, and this interference-related information is sent to microcell base station 2a.Further, according to the CQI information that user terminal 3b feeds back, the microcell base station 2a serving user terminal 3b can determine corresponding modulation coding mode (Modulation and Coding Scheme, MCS).Because the particular content of concrete CQI, acquisition and feedback system specify in existing standard, therefore, do not repeat them here.
In the execution mode of a change, user terminal 3b can also measure and calculate its Reference Signal Received Power (Reference Signal Receiving Power, RSRP).Such as, user terminal 3b knows the position (serving cell RSposition) of the reference signal of the community belonging to it, and it can measure the intensity of the reference signal of this community.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 when user terminal 3b does not know the position of the reference signal of its neighbor cell, user terminal 3b detects the signal strength signal intensity that may correspond to the one or more position of neighbor cell reference signal.Then, user terminal 3b can calculate ratio or the difference of the Reference Signal Received Power of this community and adjacent cell further, this value is quantized, then using quantize after value as interference-related information, feed back to for user terminal 3b serve microcell base station 2a.
Certainly, according to the measurement capability of user terminal, the interference-related information that user terminal feeds back also can comprise carrier receiver signal strength signal intensity instruction (Carrier Received SignalStrength Indicator, RSSI), or the information such as Reference Signal Received Quality (Reference SignalReceived Quality, RSRQ).
More than adopt event to trigger the mode of (event triggered), after receiving the interferometry indication information from microcell base station 2a, user terminal 3b just measures and to microcell base station 2a feedback interference relevant information.Due in heterogeneous network, interferometry is very important, therefore, in the execution mode of a change, also can adopt user terminal periodically to the mode of microcell base station 2a feedback interference relevant information, also, the second dispensing device 102 in Fig. 4 is omissible.Also be, be similar to user terminal 3b in LTE system periodically to indicate to serving BS feedback channel quality, precoding matrix indicators and order instruction (Channel Quality Indicator, Precoding Matrix Indicator, RankIndicator, CQI/PMI/RI) the same, user terminal 3b is feedback interference relevant information periodically.Therefore, the second acquisition device 103 can periodically or based on event trigger obtain user terminal 3b report interference-related information.
Then, indication information generating apparatus 104 generates interference coordination indication information according to the interference-related information carrying out user terminal 3b.
When the interference-related information that user terminal 3b feeds back is the CQI of user terminal 3b, the CQI that indication information generating apparatus 104 feeds back according to user terminal 3b, estimate the disturbed condition from macro base station 1 that user terminal 3b is subject to, to generate the second interference coordination indication information.
When difference or the ratio of the RSRP that the interference-related information that user terminal 3b feeds back calculates for user terminal 3b, indication information generating apparatus 104 is directly according to this 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 indication information.
This interference coordination indication information comprises Relative Narrowband TX Power (RelativeNarrowband Transmit Power, RNTP) indication information.This RNTP indication information is used for the form of bit Map, instruction Physical Resource Block (Physical Resource Block, PRB) invoked situation.Also be, whether certain PRB is employed, or to launch without any signal for a long time, also namely adopt 1 bit to indicate the maximum transmission power on this PRB whether to exceed certain threshold value (if this thresholding dispatches from the factory the x% of specified transmitting power in base station) for each PRB.The concrete definition of RNTP refers to 3GPP Technical Specification36.213, " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures (Release8) ",
www.3gpp.org, do not repeat them here.
Then, when being connected by X2 interface between macro base station 1 with microcell base station 2a, the second interference coordination indication information generated by indication information generating apparatus 104 is sent to macro base station 1 by the first dispensing device 105.Certainly, except RNTP, the load Distribution situation etc. of this community can also be comprised in the first and second interference coordination indication informations, so that interference coordination strategy is determined in the base station receiving this first or second interference coordination indication information.
In addition, the first acquisition device 100 obtains the first interference coordination indication information from macro base station 1, and this first interference coordination indication information is used to indicate the interference profile that microcell base station 2a may cause macro base station 1, such as, comprises RNTP quantized value.
Illustrate when there is X2 interface between macro base station 1 and microcell base station 2a in above execution mode, first acquisition device 100 directly obtains the first interference coordination indication information from macro base station 1 by X2 interface, and the second interference coordination indication information is directly sent to macro base station 1 by X2 interface by the first dispensing device 105.When there is not X2 interface between macro base station 1 and microcell base station 2a, if adopt the scheme of core net these harmony messages mutual can cause the larger time delay of harmony messages.Such as, when macro base station 1 wishes the first interference coordination indication information to be sent to microcell base station 2a, first interference coordination indication information needs via the gateway forwards be connected with macro base station 1 to core net, again by core net be transmitted to microcell base station 2a gateway in a network, and then by microcell base station 2a gateway forwards in a network to microcell base station 2a, because the repeating process of information relates to multiple network entity, therefore, the delay brought is very large.
Therefore, there is not the network architecture of X2 interface between macro base station 1 and microcell base station 2a under, air interface (Over The Air, OTA) can be passed through by user terminal relaying first and second interference coordination indication information.Indication information generating apparatus 104 generates the second interference coordination indication information.Because adopt air interface transmission second interference coordination indication information, in order to reduce OTA transmitted bit, reduce signaling consumption, indication information generating apparatus 104 can generate the interference coordination indication information of simplification.Still be described for RNTP information.When having X2 interface between microcell base station 2a and macro base station 1, whether the RNTP information that microcell base station 2a generates based on PRB, also, can exceed certain threshold value with the maximum transmission power that each PRB adopts 1 bit to be used to indicate on this PRB.Because for microcell base station 2a, it is usually operated on subband, only takies the part PRB in usable spectrum, and therefore, the RNTP fed back in whole available band not only wastes bandwidth, and is inaccurate.Therefore, in order to reflect the disturbed condition in the frequency that microcell base station 2a works exactly, indication information generating apparatus 104 can based on subband feedback RNTP.Can should be obtain for each PRB on subband based on the RNTP information of subband, also can be obtain a value for whole subband, then, indication information generating apparatus 104, by this RNTP information based on the simplification of subband, feeds back as the second interference coordination indication information.
Then, the second interference coordination indication information is sent to user terminal 3b by the first dispensing device 105, by user terminal 3b by this second interference coordination indication information again to this second interference coordination indication information of up transmission.
There is not the network architecture of X2 interface between macro base station 1 and microcell base station 2a under, the first acquisition device 100 is by intercepting (overhear) the first interference coordination indication information.
Then, determining device 101, according to the first interference coordination indication information from macro base station 1, determines power regulation scheme, such as, the need of the transmitting power of adjustment microcell base station 2a.Such as, when the interference that the user terminal (such as user terminal 2a) of the first interference coordination indication information instruction microcell base station 2a to edge, macro base station 1 jurisdiction district causes is greater than predetermined threshold, then correspondingly, microcell base station 2a reduces transmitting power; Or when microcell base station 2a wishes to increase transmitting power, but when the interference that indicates the user terminal of this microcell base station 2a to edge, jurisdiction district, base station 1 to cause of the first interference coordination indication information is large, microcell base station 2a does not increase transmitting power; Or, microcell base station 2a wishes to increase transmitting power, and the interference that the first interference coordination indication information instruction user terminal (such as user terminal 2a) of microcell base station 2a to edge, macro base station 1 jurisdiction district causes is when being less than predetermined threshold, then correspondingly, microcell base station 2a can increase transmitting power.Choosing of this predetermined threshold according to the experience of the grid parameter of reality and those skilled in the art, can be configured.
Microcell base station 2a, in order to carry out power adjustment, can arrange the option of one group of transmitting power, such as, with { P-6, P-3, P, P+3, P+6 (dBm) } that power P dBm is benchmark.Also namely, be benchmark with P dBm, step-length is multiple performance numbers of 3dBm.When needs adjustment transmitting power, microcell base station 2a can increase at every turn or reduce a stepping.Certainly, this reference power value P, and step value all can set and adjust.
It should be noted that, above-described embodiment is only exemplary, but not limitation of the present invention.Any technical scheme not deviating from spirit of the present invention all should fall within protection scope of the present invention, and this comprises the different technologies feature that use occurs in different embodiments, and dispatching method can combine, to obtain beneficial effect.In addition, any Reference numeral in claim should be considered as the claim involved by restriction; " comprise " word and do not get rid of device unlisted in other claim or specification or step; " one " before device does not get rid of the existence of multiple such device; In the equipment comprising multiple device, the one or more function in the plurality of device can be realized by same hardware or software module; The word such as " first ", " second ", " the 3rd " is only used for representing title, and does not represent any specific order.
Claims (11)
1. in microcell base station for adjusting a method for transmitting power, wherein, described microcell base station is overlapping at least partly with the coverage of macro base station, comprises the following steps:
I. obtain the first interference coordination indication information from described macro base station, described first interference coordination indication information is used to indicate the interference profile that described microcell base station may cause described macro base station jurisdiction district, wherein,
When described microcell base station is connected by X2 interface with described macro base station, by described X2 interface, obtain described first interference coordination indication information;
When there is not described X2 interface between described microcell base station and described macro base station, obtain from described macro base station, the described first interference coordination indication information that forwarded by least one user terminal;
II. according to described first interference coordination indication information, transmitting power Adjusted Option is determined;
Wherein, also comprise before described Step II:
A. the interference-related information of one or more user terminal report is obtained;
B. according to described interference-related information, the second interference coordination indication information is generated;
C. described second interference coordination indication information is sent to described macro base station, wherein, described second interference coordination indication information is used for carrying out interference coordination by described macro base station.
2. method according to claim 1, wherein, described step B also comprises: according to described interference-related information, and based on the subband that described microcell base station works, generates the described second interference coordination indication information based on subband.
3. method according to claim 1 and 2, wherein, when described microcell base station is connected by X2 interface with described macro base station, described step C also comprises:
By described X2 interface, described second interference coordination indication information is sent to described macro base station;
Or when there is not X2 interface between described microcell base station and described macro base station, described step C also comprises:
Described second interference coordination indication information is sent to described macro base station by several user terminals.
4. the method according to any one of claim 1 or 2, when described microcell base station wishes adjustment transmitting power, also comprises before described steps A:
-sending interferometry indication information to described user terminal, described interferometry indication information is used to indicate at least one user terminal measurement described and reports described interference-related information.
5. the method according to any one of claim 1 or 2, wherein, described Step II also comprises:
-when described first interference coordination indication information indicates described microcell base station to be greater than predetermined threshold to the interference that described macro base station jurisdiction district is formed, determine to reduce described transmitting power;
-otherwise, keep or increase described transmitting power.
6. the method according to any one of claim 1 or 2, wherein, described interference-related information comprises the Reference Signal Received Power of channel quality information or quantification, and described first interference coordination indication information comprises any one in the following or appoints multinomial:
The Relative Narrowband TX Power of-described macro base station;
The Relative Narrowband TX Power of-described macro base station and the load Distribution of described macro base station community;
And/or described second interference coordination indication information comprises any one in the following or appoints multinomial:
The Relative Narrowband TX Power of-described microcell base station;
The Relative Narrowband TX Power of-described microcell base station and the load Distribution of described microcell base station community.
7. in microcell base station for adjusting a processing unit for transmitting power, wherein, described microcell base station is overlapping at least partly with the coverage of macro base station, comprising:
First acquisition device, for obtaining the first interference coordination indication information from described macro base station, described first interference coordination indication information is used to indicate the interference profile that described microcell base station may cause described macro base station jurisdiction district; Wherein,
When described microcell base station is connected by X2 interface with described macro base station, described first acquisition device also for: by described X2 interface, obtain described first interference coordination indication information;
When there is not described X2 interface between described microcell base station and described macro base station, described first acquisition device also for: obtain from described macro base station, the described first interference coordination indication information that forwarded by least one user terminal;
Determining device, for according to described first interference coordination indication information, determines transmitting power Adjusted Option;
Second acquisition device, for obtaining the interference-related information of one or more user terminal report;
Indication information generating apparatus, for according to described interference-related information, generates the second interference coordination indication information;
First dispensing device, for described second interference coordination indication information is sent to described macro base station, wherein, described second interference coordination indication information is used for carrying out interference coordination by described macro base station.
8. processing unit according to claim 7, wherein, described indication information generating apparatus also for: according to described interference-related information, and based on the subband that described microcell base station works, generate the described second interference coordination indication information based on subband.
9. the processing unit according to claim 7 or 8, wherein, when described microcell base station is connected by X2 interface with described macro base station, described first dispensing device also for:
By described X2 interface, described second interference coordination indication information is sent to described macro base station;
Or, when there is not X2 interface between described microcell base station and described macro base station, described first dispensing device also for:
Described second interference coordination indication information is sent to described macro base station by several user terminals.
10. the processing unit according to any one of claim 7 or 8, when described microcell base station wishes adjustment transmitting power, described processing unit also comprises:
Second dispensing device, for sending interferometry indication information to described user terminal, described interferometry indication information is used to indicate at least one user terminal measurement described and reports described interference-related information.
11. processing unit according to any one of claim 7 or 8, wherein, described determining device also for:
-when described first interference coordination indication information indicates described microcell base station to be greater than predetermined threshold to the interference that described macro base station jurisdiction district is formed, determine to reduce described transmitting power;
-otherwise, keep or increase described transmitting 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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| CN103024885B (en) * | 2011-09-22 | 2016-08-03 | 华为技术有限公司 | The adaptive power of microcell base station adjusts |
| WO2013181829A1 (en) * | 2012-06-07 | 2013-12-12 | Renesas Mobile Corporation | Apparatuses, methods and computer program products related to improvements in carrier loading status reports |
| CN103916901A (en) * | 2012-12-31 | 2014-07-09 | 华为技术有限公司 | Power control method and base station |
| CN104244335B (en) * | 2013-06-13 | 2019-12-10 | 索尼公司 | Interference coordination method, interference coordination device and measurement device |
| CN103338505B (en) * | 2013-07-18 | 2016-02-24 | 西安电子科技大学 | The joint Power coordination approach of perception is disturbed in a kind of hierarchical cellular network |
| CN105532044B (en) * | 2013-07-31 | 2019-05-28 | 华为技术有限公司 | The sending, receiving method and device of data frame |
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| CN107113714B (en) * | 2014-10-31 | 2021-01-29 | 华为技术有限公司 | Power estimation method and device |
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