CN102612832B - Utilize and coordinate the system and method that aerial array strengthens base station performance - Google Patents
Utilize and coordinate the system and method that aerial array strengthens base station performance Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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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
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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Abstract
In radio systems, base station (BTS) group can by integrated network management system entity management or by communicating with one another and Self management via radio air interfaces or wireline interface.Such example is femtocell system.When BTS with relatively large transmitted power use send and receive same frequency and when they are closer to each other, due to the interference between BTS and between user, and make the performance of this system and user throughput or QoS (service quality) deteriorated.Can in BTS group (such as, femtocell) between use intelligent antenna technology in a coordinated fashion, to avoid or to reduce interference, or management interference occurs in which way, thus the performance enhancement of the higher throughput of system of acquisition such as each application or better QoS.
Description
Technical field
The present invention relates to radio communication, and the applying intelligent antenna technology in a coordinated fashion that to relate in the base station group of such as femtocell reduces interference or management interference occurs in which way.
Background technology
Aerial array by overcoming less desirable channel status for send and Received signal strength provides a kind of mode efficiently, thus raising capacity, data throughout and link range.The individual antenna of bandwidth, direction and amplitude is limited to unlike parameter, the beam pattern (beampattern) of aerial array creates by weight vector (weightvector), described weight vector mainly revise one of the amplitude and phase place of the signal being sent by antenna or receive or both.Although can by hardware application weight in radio frequency (RF) territory, usually applying weight in the digital domain can be more efficient and actual.
There is different modes to realize aerial array, which results in many different technology, algorithm, classification and term.For the ease of discussing, we are divided into two classes: multiple-input and multiple-output (MIMO) and Wave beam forming (beamforming).
Wave beam forming is a kind of signal processing technology of using in the sensor array sending and receive at the signal for orientation.When sending, Beam-former controls phase place and the relative amplitude of the signal at each transmitter place, to produce the signal graph (signalpattern) of expectation.When 330 receiving, the information from different sensors is combined in the mode of the radiation diagram regaining expectation.Usually adjusted in analog domain or numeric field by so-called antenna weight.In the digital domain, weight is represented by plural array.By using self adaptation or fixing reception/transmission beam pattern implementation space selectivity.Compared with omnidirectional antenna, fixing Beam-former has outstanding improvement in performance or gain.But it is the Adaptive beamformer ensureing to have very large improvement in performance in wireless system.Adaptive beamformer system requires certain feedback of the channel information of the equipment from communication system other end place usually, or determines how to adjust antenna weight to the assessment of information.
MIMO uses multiple antenna to improve communication performance at transmitter and receiver place.In mimo systems, transmitter sends multiple stream by multiple transmitting antenna.What sent flows through the matrix channel be made up of the mulitpath between multiple transmitting antenna at transmitter place and multiple reception antennas at receiver place.Then, receiver obtains received signal vector by multiple reception antenna, and received signal vector is decoded into raw information.
SISO (single-input single-output), SIMO (single input and multi-output) and MISO (multiple input single output) are the special circumstances of MIMO.Also there is open loop MIMO and closed-loop MIMO.An example of open loop MIMO is the transmitting diversity (transmitdiversity) of such as space time transmitting diversity (Space-TimeTransmitDiversity, STTD) used in universal mobile telecommunications system (UMTS) standard and CDMA2000 standard.The example of open loop SIMO is the receiver diversity of receiver diversity or the switching of combining with MRC.MIMO can be divided into three major types sometimes: spatial multiplexing, transmitting diversity or space time coding and precoding.
Precoding can be regarded as the general Wave beam forming of the single or multiple lift transmission supported in mimo system.In the absence of scattering, Wave beam forming produces and limits good orientation direction figure, but usually, honeycomb tradition wave beam (cellularconventionalbeam) is not exclusively simulation.When receiver has multiple antenna, transmission Wave beam forming the signal level of all reception antennas can not be maximized simultaneously and precoding is used.
Pre-coding scheme can be used in the mimo system of the scheduled justice of antenna configuration.In this case, the code book of definition weight can be derived based on the directional beam directional diagram (directionalbeampattern) expected.Overlapping very many with based on the Adaptive beamformer estimated of the type precoding.In detailed description, we are not by it and distinguish based on the Adaptive beamformer estimated.Also precoding can be used in the mimo system of the not scheduled justice of antenna configuration.In this case, based on such as under certain channel status, maximized for signal level standard being derived code book.Note, precoding needs the knowledge of the channel condition information (CSI) at transmitter place.Precoding has been used in the 4G wireless standard of such as Long Term Evolution (LongTermEvolution, LTE).
In aerial array, the layout of antenna is very important.For Wave beam forming, the antenna spacing in uniform linear array (ULA) should be about λ/2, and for MIMO, preferred antenna spacing is about 4 λ ~ 10 λ.Homogeneous Circular array (UCA) is the another kind of mode of arranging antenna.Also there are other modes of arranging aerial array, such as, 2-D array etc.
Coordination aerial array is studied.But prior art solves each BTS usually, and how using method improves the communication carried out with multiple terminal.Such as, U.S. Patent application 20080075033 describes Beam Forming System, comprise: the wireless terminal array of cooperation, it is coupled at least one wireless wide area network and can be coupled to the WLAN (wireless local area network) being configured to the information exchange provided between wireless terminal communicatedly.The Beam Forming System of cooperation uses the aerial array that formed by wireless terminal group for each wireless terminal provide aerial array process benefit (such as, channeling, exempt to disturb, ARRAY PROCESSING gain and antenna switching diversity).Access to netwoks operator is convenient to carry out the network control function between WWAN and the wireless terminal array cooperated.This patent application does not solve the coordination problem of the multiple base stations all utilizing Beam Forming System.
Summary of the invention
Some execution modes disclosed herein are provided in BTS group (such as, femtocell) in the technology of applying intelligent antenna in a coordinated fashion, avoid, reduce interference or manage interference to occur in which way, thus the performance enhancement of higher throughput of system of acquisition such as each application or better QoS.
In one aspect, in the base station system with multiple wireless base station, the Wave beam forming of coordination is used to comprise to the method strengthening wireless base station performance: identify adjacent base station and determine the characteristic of the adjacent base station of use to determine the expectation Wave beam forming of two or more base station, wherein, multiple wireless base station has the antenna system can carrying out Wave beam forming.Then, based on the antenna system of determined characteristic configuration two or more base station, to produce the empty wave beam pointing to adjacent base station, thus the interference with adjacent base station is reduced.In one embodiment, the antenna system configuring more than one base station comprises the empty wave beam of generation reception further to produce empty wave beam.
The another aspect of the method comprises: measure the signal that receives from adjacent base station to determine direction and the distance of more than one adjacent base station.In addition, the method can comprise the transmission characteristic coordinating two or more base station.
On the other hand, transmission characteristic is selected from the group comprising transmitted power, time, frequency source, T/F frequency source.In addition, the method can comprise the characteristic by central authorization certainty annuity.Alternatively, the characteristic of certainty annuity is coordinated between the base stations.
In another, in the wireless network with multiple wireless base station, the Wave beam forming of coordination is used to comprise to the method strengthening wireless base station performance: identify that the antenna system of adjacent base station and configuration two or more base station is to produce beam pattern thus to reduce the interference with adjacent base station, wherein, multiple wireless base station has the antenna system can carrying out Wave beam forming.
In addition, beam pattern can be included in the territory, common footprint of two or more base station and use frequency division.In addition, beam pattern can be included in the territory, common footprint of two or more base station and use frequency division timesharing.
In one aspect, antenna configuration is selected from the configuration subset in the code book of directional diagram, the directional diagram having more weak beam pattern to select to have stronger beam pattern on subscriber direction on the direction of adjacent base station.
Being included in the system of base station on the other hand uses the velocity of wave of coordination to form the base station of strengthening the property.This base station comprises: broadcast interface transceiver system, and it provides with the radio communication of relevant subscriber and performs Wave beam forming and comprise the antenna system can carrying out Wave beam forming; Second receiver, the signal be configured to another base station sends is measured; And control unit, communicate with subscriber's broadcast interface system and the second receiver, to configure the antenna system of subscriber's broadcast interface system based on the characteristic of more than one adjacent base station to subscriber's broadcast interface system transmission instruction, thus produce the empty wave beam pointing to adjacent base station, to reduce the interference with adjacent base station.
Hereinafter with reference to accompanying drawing, these and other aspect of the present invention is described.
Accompanying drawing explanation
Fig. 1 shows femtocell BTS is connected to core network typical femtocell system by broadband connection.The supply of each femtocell BTS is carried out based on each equipment by core network.
Fig. 2 a shows femtocell BTS is connected to the femtocell network system of a core network execution mode by wired or wireless broadband connection.Femtocell is via wire-line back haul circuit or radio broadcasting networking.The supply of femtocell BTS can by core network based on each equipment or supervise completely at core network, Core Network elements carries out when supervising or do not supervise in a coordinated fashion.
Fig. 2 b is the block diagram of femtocell BTS.
Fig. 3 distance shown between element is the beam pattern of 4 element uniform linear arrays of half-wavelength.
Fig. 4 shows the example being produced empty wave beam on adjacent BTS direction by femtocell BTS.
Fig. 5 shows and produce by two femtocell BTS the example that empty wave beam will throw into question to one of BTS on adjacent BTS direction.It also illustrate BTS and periodically detect the scheme that whether there is arbitrary subscriber in scan empty beam pattern direction.
Fig. 6 show to the adjustment of the transmitted power of wave beam make BTS control and neighbouring subscribers interference while can serve their subscriber s.
Fig. 7 shows the example of the time-sharing multiplex (time-divisionmultiplex) of the wave beam between adjacent BTS.
Fig. 8 shows the example of the frequeney division multiple (FDM) multiplexing (frequency-divisionmultiplexing) (based on groups of subchannels) of the wave beam between adjacent BTS.
Fig. 9 shows the example of the time-frequency division multiplexed (time-frequencydivisionmultiplexing) (based on T/F source group) of the wave beam between adjacent BTS.
Figure 10 a to Figure 10 d shows the example formed based on the coordinates beam that space/orientation, time, frequency and time-frequency are multiplexed by BTS group.
Figure 11 show use directional beam to be formed and from the coordinated measurement of adjacent BTS to the example of the BTS in the direction and distance of determining adjacent BTS.
Figure 12 show be used in 3GPPLTE standard for down link definition and the distance be applied between element is the beam pattern of the code book of 4 element ULA of half-wavelength.
Figure 13 show be used in 3GPPLTE standard for down link definition and the distance be applied between element is the beam pattern of the code book of 4 element UCA of 0.42 wavelength.
Figure 14 shows the example formed based on the coordinates beam of the code book in space and direction by BTS group.
Figure 15 shows the example formed based on the coordinates beam that time, frequency and T/F are multiplexed by BTS group.
Embodiment
After reading this description, to it will be evident to one of ordinary skill in the art that as how various replaceable execution mode and replaceable should being used for implement the present invention.Although there is described herein various execution mode of the present invention, should be understood that, these execution modes are only illustrate in an illustrative manner, and are not limited to.Therefore, these detailed descriptions of various replaceable execution mode should not be interpreted as limiting the scope of the invention and range.
In radio systems, group of base stations (BTS) can be managed by integrated network management system entity (centralizednetworkmanagementidentity), or by communicating with one another via radio air interfaces (wirelessair-interface) or wireline interface and carry out Self management (self-organized).Term " base station " also refers to an access a little.Such example is femtocell system.Fig. 1 shows the femtocell system that femtocell BTS10 is managed by core network.Femtocell system is connected to core network 12 via internet 14 and radio network controller (RNC) 16 by broadband connection.The supply of each femtocell BTS is carried out based on each equipment via provisioning server 15 by core network.
Fig. 2 a shows femtocell BTS200 is connected to core network 12 femtocell system via wired or wireless broadband connection.Femtocell is via wire-line back haul circuit or network via radio broadcasting.The supply of femtocell BTS is supervised by core network 12 based on each equipment or in the part of supervision, the core network completely of core network or carries out in a coordinated fashion when not supervising.Femtocell be less cellular basestation or cellular network 18 be operated in the frequency of license under, or be operated in the access point under unlicensed frequency as required.Generally designate and be used in house or little business environment.Femtocell uses the available broadband access of such as DSL, cable or fixing wireless wideband access network, comes to be communicated with also control flow check with user and crosses the data in broadband and be connected to cellular core network back haul link.This is shown in Figure 1.Femtocell in conjunction with typical base station functions, but is expanded to simpler, the self-contained configuration of permission; Such as, comprise the UMTS femtocell of Node B and there is the RNC of the internet for back haul link.Although dropped into a lot of concerns to UMTS, described thought can be applicable to all standards, comprises GSM, CDMA2000, TD-SCDMA and WiMAX scheme.
When BTS is just using same frequency for sending and receiving with relatively large transmitted power and when their are close to (such as femtocell) each other, due to the interference between BTS and between user, the performance of such as system and user throughput or QoS is made to become deterioration.Intelligent antenna technology can be used in a coordinated fashion between BTS group (such as femtocell), reduce interference or manage interference to occur in which way, thus obtain higher throughput of system of such as each application or the performance enhancement of better QoS.
Carried out a large amount of research work about the Wave beam forming of base station, MIMO and precoding, but great majority work concentrates on algorithm itself or how they is applied to each base station to improve the performance in territory, particular base station service area.They do not solve the use how coordinating the aerial array between multiple base station.
Adaptive beamformer can carry out based on certain measurement, to determine the direction and intensity of beam pattern.An example is direction of arrival (Direction-Of-Arrival, DOA) base Wave beam forming.In DOA base Wave beam forming, the aerial array (such as, having uniform linear array (ULA) or the Homogeneous Circular array (UCA) of little inter-element spacing (d≤λ/2)) with certain geometric sense is utilized to estimate main direction of arrival (directionofarrival).Then this directional information is used to the transmission wave beam produced by linear weight to control to terminal.
In typical femtocell system, femtocell BTS is connected to core network by broadband connection.The supply of each femtocell BTS is carried out based on each equipment by core network.When femtocell system have carry out via wire-line back haul circuit or radio broadcasting the ability networked or coordinate time, the management of femtocell BTS and supply have come based on each equipment or when core network is supervised (complete set Chinese style), Core Network elements supervision (segment set Chinese style) completely or do not supervised (distributed) completely in a coordinated fashion by core network.
Show the example of BTS200 in figure 2b, wherein, eliminate the element of the incoherent BTS with this discussion.BTS comprises femtocell BTS equipment 200, femtocell BTS equipment and has BTS broadcast interface transceiver system (air-interfacetransceiversystem) 210 for communicating with relevant subscriber.In an example, system 210 is femtocell systems.BTS broadcast interface transceiver system comprises the antenna system (it can be used as example to be described) that can perform Wave beam forming herein.Transceiver 210 performs to be provided radio communication to subscriber and provides the function of the radio communication from subscriber.Such as, this system is known as and provides wireless service, and some of them implement the standard known, such as, and GSM, CDMA2000, TD-SCDMA and WiMAX.Subscriber refers to the equipment of the signal receiving and/or be sent to BTS.Subscriber is associated with BTS usually.This equipment is also called subscriber equipment (UE).This equipment can send and receive wireless signal, and comprises such as cellular equipment and be such as equipped with other electronic equipments of personal computer of transceiver.Comprise the second receiver 212, to make it possible to carry out the measurement that other BTS send signal.Alternatively, BTS broadcast interface transceiver can be revised as carry out those measure.Comprise control unit 214, to make to use central authorities/peer communication unit (central/peercommunicationunit) 216 (such as, femto server and femto-femto communication unit), can communicate with central server and/or with other femtocells BTS with Peer.Control unit produces instruction to BTS transceiver 210, to implement the coordination between Wave beam forming described herein and BTS.This system uses the agreement and related news of supporting the communication between femtocell BTS and central server and the communication between control unit and BTS transceiver 210.Control unit comprises message parser (messageparser) for resolving the message received and the database for storing neighbor lists described below.
According to an execution mode, such as above-describedly the BTS of femtocell 200 of phase the Internet and coordination can coordinate how to carry out Wave beam forming at each independent BTS respectively or jointly according to beam direction, beam pattern, transmitted power, time, frequency source, T/F source.The target of this coordination is, improve network service behaviour and reduce interference, therefore, the standard that Wave beam forming uses in coordinating includes but not limited to, the data rate, qos requirement etc. of auxiliary or reference signal intensity, the error rate or packet error rate, data throughout, requirement.This has come by centralized system or by distributed way.This can by considering that different antenna array configuration has been come.
There is position at x for use
1, x
2..., x
nthe Beam-former of uniform linear array of N number of omnidirectional antenna element, suppose that plane wave is measured along end-fire (endfire), wavelength incident from direction θ be λ, then the array of the n-th element launches (arraymanifold) and is:
At application weight w
nafter beamformer output directional diagram be:
Complex weight vector w=[w can be selected
1, w
2..., w
n]
tobtain the beam pattern of the expectation for transmitter.Identical equation can be applicable to receiver-side and which results in receiver Wave beam forming.
The example of the beam pattern of 4 element ULA is shown in Figure 3, wherein:
By selecting different weights with adapting to from above-mentioned matrix, receiver or transmitter beam pattern can be formed to strengthen transmission signal or the Received signal strength of expectation, or reduce the interference signal in certain orientation or region.
According to an execution mode, suppose that contiguous femtocell BTS has the knowledge (knowledge) of relative direction each other and relative distance.Term " contiguous (neighbor) " and " contiguous (adjacent, neighboring) " is used to refer to that its transmission can interactional BTS.This knowledge can come from from central authorities/BTS communication unit 216 or the information being sent to central location from the second receiver/measuring unit 212.The UE broadcast interface 210 of femtocell BTS apply suitable weight produce on the direction of adjacent BTS about send or receive or both one with overhead wave beam.When the distance between adjacent BTS is relatively far away compared with the distance between described BTS with its relevant user equipment (UE), the zero direction figure (nullpattern) about transmitter is pointed to the interference that adjacent BTS can reduce from BTS to the UE of adjacent femtocell on down link (DL) direction.Towards the interference that adjacent BTS application can reduce from the UE of adjacent femtocell to described BTS on up link (UL) direction about the zero direction figure of receiver.This is shown in the Fig. 4 for two femtocell BTS1 and BTS2.
How far be arranged as according to by adjacent BTS, can have problems, this is because some UE can be positioned on the direction of adjacent BTS to each adjacent BTS application zero direction figure.The example of this situation is shown in Figure 5, and wherein the empty wave beam of BTS1 will cause the performance degradation of UE1 or even lose communication.
According to another execution mode, BTS is " scanning " empty beam area periodically, such as, and application weight, to make it periodically will send and Received signal strength on original empty beam direction, to detect arbitrary UE whether in " empty wave beam " region or move to " empty wave beam " region.Cycle can by central server according to network management parameter, by the coordination of multiple BTS or determined by each BTS.When the UE needing service being detected, BTS applies suitable beam pattern by original empty wave beam, to provide suitable performance requirement to UE.This is shown in Figure 5, and wherein, first BTS1 produces the empty wave beam on BTS2 direction, and detects UE1 when it scans sky beam area.Then BTS1 uses suitable beam pattern to carry out alternative empty wave beam, to communicate with UE1.Note, when there is UE from two BTS the empty beam direction graph region (directionalnullbeampatternarea) of orientation, said method still causes the performance degradation of UE.
According to another embodiment of the present invention, BTS reduces or utilizes some indexs (to measure while increasing their transmitted powers on DL, metric) the DL quality of reception of (such as, from BER, PER, ACK/NACK etc. of DLARQ or hydridization ARQ) monitoring UE.When the index carrying out the UE in comfortable all BTS overlay areas all has satisfied performance (it depends on the Qos grade of each UE or application), BTS will keep transmission power level until more than one index does not meet.This is shown in Figure 6.
Before the performance index from UE in other BTS coverages are satisfied (interference mainly due to from described BTS) not yet, when BTS reaches predetermined minimum transmission power level, stopping is reduced through-put power by described BTS.The other technologies described in detail after a while can be used satisfactory to realize whole system performance.
According to another implementation of the invention, some in all BTS of BTS have in the territory, common footprint of serviced UE and use Wave beam forming in time-sharing multiplex mode.This is shown in Figure 7.By so, BTS ALARA Principle interference substantially, and therefore can improve the performance except only adjusting except through-put power.Note, timesharing can be applicable to wave beam on DL and UL and empty wave beam.Be also noted that, BTS can be operated by the complete centralized fashion of the server controls at gateway or core network place, part distributed way or the complete distributed way via peer-to-peer communications.
According to another embodiment of the present invention, each BTS uses Wave beam forming in frequency division mode.In OFDMA system, this means to use different sons group frequently, only frequently organize to make the belonging to UE that different B TS is being positioned at territory, common footprint the data receiving them with particular child.This is shown in Figure 8, and wherein, the UE1 of UE1 and BTS2 of BTS1 is arranged in the region that two BTS disturb mutually, and this does not solve by reducing through-put power.When two UE need application support in real time, such as, the timesharing using Wave beam forming is unsuitable.When whole bandwidth is not limiting factor for arbitrary UE application, the use of next " segmentation " group of subbands that BTS can determine (or server can determine), and apply different Wave beam forming to each group.Note, frequency division can be applicable to wave beam on DL and UL and empty wave beam.It is also noted that BTS can be operated by the complete centralized fashion of the server controls at gateway or core network place, part distributed way or the complete distributed way via peer-to-peer communications.
According to another embodiment of the present invention, each BTS uses Wave beam forming in timesharing-frequency division mode, as shown in Figure 9.In OFDMA system, it means use different resources in time-frequency division face, to make to belong to different B TS but the UE being arranged in territory, common footprint only receives their data at special time-frequency source.In fig .9, such as, the UE1 of UE1 and BTS2 of BTS1 is in the region that two BTS disturb mutually, and this is indeterminable by reducing through-put power.BTS can determine to meet some performance requirements mode service time-frequency source, such as, there is through certain hour section the Qos requirement of certain data rate.Based on these, BTS to cooperatively for each UE being arranged in this beam pattern overlay area distributes T/F source, and can apply different Wave beam forming to each resource group.Note, timesharing-frequency division source can be applicable to wave beam on DL and UL and empty wave beam.It is also noted that BTS can be operated by the complete centralized fashion of the server controls at gateway or core network place, part distributed way or the complete distributed way via peer-to-peer communications.
Although used two BTS to show above-mentioned situation, the method can easily be applied to plural BTS.As shown in Figure 10 a to Figure 10 d, BTS group (BTS1, BTS2, BTS3 and BTS4) coordinates beam can be formed in space/orientation, through-put power and time, frequency, T/F are multiplexed, and by Resourse Distribute to the UE in beam pattern.In this case, BTS can centralized fashion, part distributed way or complete distributed way operate completely.Different scheduling and tuning algorithm can be applied according to this principle, and will detailed coordination approach be described at subsequent section.
According to another embodiment of the present invention, BTS uses directional beam formation and determines direction and the distance of contiguous BTS from the coordinated measurement result of contiguous BTS.This is also shown in Figure 10 a to Figure 10 d.In this example, BTS1 applies the Wave beam forming adopting a certain reference signal on four 30 degree of detaching directions with the given time interval.This time and interval are known for contiguous BTS.Contiguous BTS (in this example, i.e. BTS2 and BTS3) can measure DL reference signal and can carry out peer-to-peer communications with BTS1.They with measure signal intensity preset time, and are reported to BTS1.Based on the measured value of time and signal, BTS1 can determine direction and the relative distance of contiguous BTS.Result depends on selected Measurement Algorithm and timing accuracy and selected beamforming algorithm.This Information Availability is in determining it is directions of important contiguous BTS for more above-mentioned execution modes.Such as, can also used as to the input of database and the topology of contiguous BTS in other application.Note, other algorithms can also be used, those algorithms that such as DOA uses.
According to another embodiment of the present invention, the antenna configuration of the other types outside ULA can be used, and said method is still available.
As an example, have in the Beam-former of Homogeneous Circular array (UCA) of N number of omnidirectional antenna element in use, the n-th element that array launches is:
Wherein, r
nthe distance from array center to element, and
from the angle position that the x-axis of the n-th array element counterclockwise calculates in polar coordinates.
After application weight, beamformer output is:
Complex weight vector w=[w
1, w
2... w
n]
tcan be selected, to obtain the beam pattern expected at transmitter place.Identical equation can be applicable to receiver-side, and will cause receiver Wave beam forming.
As in all execution modes in ULA situation, BTS can the multiplexed mode coordinates beam of space/orientation, transmitted power and time, frequency, T/F be formed, as shown in Figure 10 a to Figure 10 d.BTS can with complete centralized fashion, part distributed way or complete distributed way executable operations.Different schemes and tuning algorithm can be used according to principle, and will coordination approach be described in detail in part after a while.
Although it should be noted that in the above-described embodiment, omni-directional antenna arrays element is used as example, and result also easily can expand to directional antenna array.
For the Wave beam forming of general type, use in some 4G standards (such as, LTE) and there is prescribed password precoding originally.Pre-coding scheme can be used in the mimo system of the scheduled justice of antenna configuration.In this case, the code book for defining weight can be derived based on the directional beam directional diagram expected.It can also be used for antenna configuration does not have in scheduled mimo system.In this case, based on such as under certain channel status the standard of maximum signal level to derive code book.
As an example, table 1 shows the code book of 4 element antenna array, wherein,
represent according to expression formula W
n=I-2u
nu
n h/ u
n hu
nby set, { matrix that the row that S} provides limit, wherein I is 4 × 4 unit matrixs and vectorial u
nprovided by table.Figure 12 illustrates the beam pattern of transport layer when utilizing component space to be spaced apart λ/2, and figure 13 illustrates the beam pattern of transport layer when utilizing component space to be spaced apart 0.42 λ.
Table 1 is used in the code book of the DL transmission of 4 antenna ports defined in LTE standard
According to an embodiment of the invention, based on the direction of stronger beam pattern or alignment regions, code book can be divided into two or more subset.Femtocell BTS selects the subset on UE direction in code book with stronger beam pattern, and avoids being used in the subset contiguous BTS direction with stronger beam pattern.
In fig. 12, the LTE code book of the DL transmission for having one deck is shown as the example for above-mentioned and following execution mode.Possible mode is that the plane that 0 to 180 spends is divided into 6 alignment regions with the interval of 30 degree, and they is divided into groups with strong beam pattern in each alignment regions.For 0-30 degree, weight subset comprises index 3,6,7,10,12,13,14,15,16; For 30-60 degree, weight subset comprises index 2,6,11,14,15; For 60-90 degree, weight subset comprises index 1,5,9,13,16; For 90-120 degree, weight subset comprises index 1,4,8,9,13,16; For 120-150 degree, weight subset comprises index 4,7,11,14,15; For 150-180 degree, weight subset comprises index 3,7,10,12,13,14,15,16.Identical dividing method can be applicable to different alignment regions.When using omnidirectional antenna or the directional antenna different from 180 degree of examples, can split in a similar fashion, but different subsets can be caused.For different antenna array configuration (such as, the UCA shown in Figure 13), can dividing method like application class.
According to another embodiment of the present invention, based on empty beam pattern, code book can be divided into two or more subset.Femtocell BTS selects the subset on the direction of contiguous BTS in code book with sky wave beam.
Again use the LTE code book of the DK transmission for having one deck shown in Figure 12 as an example, a kind of possible mode is that the plane that 0 to 90 spends is divided into 4 directions with the interval of 30 degree, and they is divided into groups with empty beam pattern in each direction.Such as, for 0 degree of empty beam subset, index comprises 1,2,4,5,8,9,11; For 30 degree of empty beam subset, index comprises 1,2,4,5,7,8,9,11,12,13,16; For 60 degree of empty beam subset, index comprises 1,3,4,5,6,7,8,10,12,13,14,15,16; For 90 degree of empty beam subset, index comprises 2,3,4,5,6,7,8,9,11.Identical dividing method can be applicable to different directions.When using omnidirectional antenna or the directional antenna different from 90 degree, can split in a similar fashion, but different subsets can be caused.For different antenna array configuration (such as, the UCA shown in Figure 13), can dividing method like application class.
According to another embodiment of the present invention, based on the combination in the direction of the direction of stronger beam pattern and empty beam pattern, code book can be divided into two or more subset.The subset that femtocell BTS selects to have stronger beam pattern in code book on the direction of UE and have sky beam pattern on the direction of contiguous BTS.
Again use the LTE code book of the DK transmission for having one deck shown in Figure 12 as an example, possible mode is that the plane that 0 to 90 spends is divided into 4 directions with the interval of 30 degree, and they are had sky wave beam in a certain alignment regions with the grouping of stronger wave beam simultaneously in a desired direction.Such as, have the wave beam of sky wave beam in 90 degree of directions for covering 0-30 degree, index comprises 3,6,7 simultaneously; On 30 degree of directions, have the wave beam of sky wave beam for covering 60-90 degree, index comprises 1,5,9,13,16 simultaneously.Identical dividing method can be applicable to the various combination of alignment regions and directed null value.When using omnidirectional antenna or the directional antenna different from 90 degree, can split in a similar fashion, but different subsets can be caused.For different antenna array configuration (such as, the UCA shown in Figure 13), can dividing method like application class.
Figure 14 illustrates based on code book segmentation coordinates beam formed, wherein, BTS1 with BTS2 access to your password this identical segmentation but use different subsets, to reduce the interference in desired orientation.
According to another embodiment of the present invention, the subset of code book can be applied to the UE on BTS or UL on DL in the mode of the timesharing in BTS, frequency division or timesharing-frequency division.Based on code book segmentation this time, frequency, T/F base coordinate shown in Figure 15.In this case, BTS can with complete centralized fashion, part distributed way or complete distributed way executable operations.Different schemes and tuning algorithm can be used according to this principle, and the method for coordination will be described in detail in part after a while.
According to another embodiment of the present invention, for different antenna configurations, in a different manner code book can be divided into subset, different antenna configurations is such as but not limited to different element spacings, different sky line geometry (such as, circular, linear, rectangle etc.).
According to another embodiment of the present invention, for different BTS, in a different manner code book can be divided into subset.
According to another embodiment of the present invention, for different user/UE, code book can be divided into subset in a different manner based on the service request of their position, channel status and such as QoS.
According to another embodiment of the present invention, the subset that code book can differently be divided into different QoS to require.Such as, for higher qos requirement, expansion subset is just to reach required QoS level, even if it has some undesirably beam pattern in one direction, described beam pattern can cause interference to a certain degree to contiguous femtocell BTS.
For any aerial array geometry and element spacing, the code book based on Wave beam forming not only can use and can also use from total channel information meaning in beam pattern meaning.In this case, UE needs feedback channel information relevant parameter, such as, and the index of CQI or channel matrix rank or code book.
According to an embodiment of the invention, based on the feedback from contiguous BTS, code book is divided into two or more subset, and described BTS uses one or more subset based on performance requirement.Described BTS will send reference signal on DL.There is the foregoing contiguous BTS general measuring the ability of the DL of other BTS measuring basis signal calculate feedback parameter as required, and then feedback is sent to described BTS.The UE of described femtocell also measures the reference signal of described BTS and contiguous BTS, and provide feedback, and described feedback is normally required by broadcast interface standard.Based on the feedback from its UE and contiguous BTS, code book is divided into subset by described BTS.Such as, code book can be divided into those subsets all or some UE being provided to better performance by it, and has those subsets of less interference to contiguous BTS.Described BTS can choice for use to UE better performance is provided and contiguous BTS is had to the subset of more minor interference.
It is possible that better performance and less interference weight are not repelled mutually.In this case, according to another embodiment of the present invention, contiguous BTS timesharing, frequency division or timesharing-frequeney division multiple (FDM) multiplex mode can use identical subset or the subset of overlap.Such time, frequency, T/F base are coordinated with those shown in Figure 15 similar.In this case, BTS can centralized fashion, part distributed way or complete distributed way executable operations completely.Different schemes and tuning algorithm can be used according to this principle, and will detailed coordination approach be described in part after a while.
Although employ 4 antenna elements in the above-described embodiment, can easily be expanded to more or less antenna element.
According to another embodiment of the present invention, the coordination between BTS can be complete centralized fashion, part distributed way or complete distributed way.
According to another embodiment of the present invention, in order to make to coordinate more efficiently and more meaningful, form neighbor list by based on selected standard (such as, the measurement of the contiguous BTS of each BTS).When the measurement in the distance in such as auxiliary signal strength signal intensity or interference level, RF signal strength signal intensity meaning, direction is on predetermined threshold (or the threshold value dynamically calculated), alternatively, when relative position (such as DOA) based on the BTS measured is known, neighbor list or topology can be formed.If needed, neighbor list can also be divided into multiple level further based on different standards or different threshold values.Neighbor list dynamically changes based on real-time measurement values.Server on network keeps the neighbor list of all BTS, and each BTS keeps and copies its oneself neighbor list.
According to another embodiment of the present invention, when coordinating to be complete set Chinese style, the measurement needed for Resourse Distribute and information are sent to network via in-band signalling or out-of-band signalling or both combinations by BTS.Measure and information comprise the interference level of the BTS such as disturbed and direction, bandwidth required by its current application or data rate, son frequently group channel information or from the codebook index of the UE in interference region, the average throughput etc. of BTS.The Resourse Distribute that this information of Web vector graphic will define in execution mode before by utilizing certain Resource Management Algorithm, is formed with coordinates beam.This distributes accordingly and harmony messages is sent back to each BTS.First those Resourse Distribute of being specified by centralized resource manager should be given in BTS resource management and operate with the Wave beam forming of being specified by center-control the UE that is associated and be that under its UE distributes the meaning of surplus resources, the scheduler in each BTS has low priority than central network explorer based on its dispatching algorithm.Different schemes and resource management standard and algorithm can be applied to each BTS.
According to another embodiment of the present invention, when coordinating to be segment set Chinese style, the measurement needed for Resourse Distribute and information are sent to network via in-band signalling or out-of-band signalling or both combinations by BTS.To measure and information comprises, such as, the interference level of the BTS of interference and direction, bandwidth required by its current application or data rate, son frequently group channel information or from the codebook index of the UE in interference region, the average throughput etc. of BTS.The Resourse Distribute that this information of Web vector graphic will define in execution mode before by utilizing certain Resource Management Algorithm, is formed with coordinates beam.This distributes accordingly and harmony messages is sent back to each BTS.BTS has the mode of equal priority with they and other resources and UE, uses the information sent it back by central network explorer as the input to its scheduler.Different schemes and Resource Management Algorithm can be applicable to this.
According to another embodiment of the present invention, when coordinate be complete distributed time, then the measurement needed for Resourse Distribute and information are sent to its contiguous BTS determined by its neighbor list by BTS via out-of-band signalling.The information being sent to specific contiguous BTS only comprises those relevant to BTS.Such as, the interference level of particular B TS and direction, bandwidth required by its current application or data rate, son frequently group channel information or carry out the average throughput etc. of the codebook index of the UE that freely this BTS disturbs, its requirement to the time, group of frequencies or T/F source, BTS.Each BTS only sends relevant information to the contiguous BTS of those in neighbor list.
According to an embodiment of the invention, receiving contiguous BTS will accept request, negate ask or will beam back the revision of request based on pre-defined algorithm.But an example of the revision of request can be endowed than required less resource, or gives resource have shorter time period or time delay.
According to another embodiment of the present invention, receive, from other contiguous information of BTS and the contiguous BTS of request, information is used as the restriction to its scheduler, or be used as the part to the whole input of its scheduler.Such as, if a BTS transmitting channel information, data rate request and other necessary informations from the UE be in the interference region of the 2nd BTS, then this channel information and the Information Availability from the UE in the 2nd BTS do the input of the scheduler to the 2nd BTS.According to the output of scheduling result, the 2nd BTS determines it is acceptance, negates or propose new Resourse Distribute.
According to another embodiment of the present invention, the first and second BTS are accepted according to the request from a BTS, are denied or are modified and use following program.
When described request is denied, a BTS can consult again (such as, send and have the amendment request of less resource requirement) or accept result, and without any operating scheme when restriction and resource allocation algorithm.2nd BTS is equally also like this.
When described request is licensed, the resource of described license is treated to the input to its scheduler by a BTS together with the resource from other contiguous BTS, and the 2nd BTS should be thought of as restriction to its scheduler by permitting to the resource of a BTS.
When described request is not accepted by contiguous BTS or negates, the 2nd BTS sends back to a BTS by based on the resource grant plan proposed by the available resources determined by its scheduler or resource management entity.One BTS can determine accept new proposal or confer, that is, send the request with the amendment of less resource requirement.When a BTS accepts new proposal, a BTS will confirm the 2nd BTS.Then, the resource of license is treated to the input to its scheduler by a BTS together with the resource from other contiguous BTS, and the 2nd BTS is thought of as restriction to its scheduler by permitting to the resource of a BTS.
In all cases, can to first and the 2nd BTS apply different schemes and Resource Management Algorithm.
In this application, described technology can be applicable to process, the analog or digital hardware of numeric field process or the use RF undertaken by processor and software.No matter whether explicitly point out, always above description be suitable for.
Above embodiments describe in BTS group (such as, femtocell) in a coordinated fashion applying intelligent antenna to reduce to disturb or management interference occurs in which way thus realizes the method for the performance enhancement (such as, higher throughput of system or better QoS) to each application.
It will be understood by those skilled in the art that various illustrative logical blocks, module and the algorithm steps described in conjunction with execution mode disclosed herein can be embodied as electronic hardware, computer software or both combinations usually.In order to clearly provide this interchangeability of hardware and software, above-mentioned main according to the various example components of their functional description, block, module and step.Such function is embodied as hardware or software depends on particular system and is applied to the design restriction of whole system.For each particular system, those of ordinary skill in the art can implement described function in a varying manner, but this enforcement decision should not be construed as and deviates from scope of the present invention.In addition, the grouping of the function in module, block or step is for the ease of being described.Do not deviating under prerequisite of the present invention, specific function or step can remove from a module or block.
The various illustrative logical blocks described in conjunction with execution mode disclosed herein and module are implemented by general processor, digital signal processor (DSP), text message application-specific IC (ASIC), field programmable gate array (FPGA) or other programmable logic devices, discrete gate (discretegate) or transistor logic, discrete hardware components or its combination in any that is designed to perform function described herein or perform.General processor can be microprocessor, but alternatively, processor can be random processor, controller, microcontroller or state machine.Processor can also be embodied as the combination of computing equipment, such as, and the combination of DSP and microprocessor, multi-microprocessor, the one or more microprocessor be combined with DSP core or any other this structure.
Step in conjunction with the method described by execution mode disclosed herein or algorithm can directly with hardware, implement with the software module performed by processor or with both combinations.Software module can be present in the storage medium of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, removable dish, CD-ROM or any other form.Exemplary storage medium can be coupled to processor, and processor can be write storage medium from read information and by information.Alternatively, storage medium can be integral to the processor.Processor and storage medium can be present in ASIC.
Various execution mode also can mainly to use the such as such as hardware mode of the assembly of application-specific IC (" ASIC ") or field programmable gate array (" FPGA ") to implement each execution mode.The enforcement that can perform the hardware state machine of described function herein is also apparent for person of ordinary skill in the relevant.The combination of both hardware and softwares can also be used to implement various execution mode.
There is provided the foregoing description of disclosed execution mode to enable those of ordinary skill in the art make or to use the present invention.The various distortion of these execution modes are apparent for those of ordinary skill in the art, and under the prerequisite not deviating from the spirit and scope of the present invention, general principle described herein can be applicable to other execution modes.Therefore, should be understood that, description given herein and accompanying drawing represent current preferred mode of the present invention, and therefore represent the theme extensively imagined by the present invention.Further understanding, scope of the present invention will fully cover those of ordinary skill in the art's other execution modes apparent.
Claims (28)
1. in the base station system with multiple wireless base station, utilize the Wave beam forming of coordination to strengthen a method for wireless base station performance, described wireless base station has the antenna system can carrying out Wave beam forming, and described method comprises:
Utilize the receiver identification neighbor base station of at least one in described multiple wireless base station;
Determine by the characteristic of described neighbor base station used, for the capacity optimized in base station described in two or more and covering; And
Be configured based on the described antenna system of the characteristic determined to base station described in two or more, to produce towards the empty wave beam of neighbor base station, to reduce the interference with this neighbor base station, with based on predetermined standard by coordinating the space resources in base station described in two or more, the power resource coordinated in base station described in two or more optimizes capacity in base station described in two or more and covering, wherein, described preassigned comprises auxiliary or reference signal intensity, the error rate or packet error rate, data throughout, the data rate of requirement and quality of service requirement.
2. method according to claim 1, wherein, the described antenna system of configuration the above base station produces empty wave beam and comprises the empty wave beam of generation reception further.
3. method according to claim 1, wherein, identifies that neighbor base station comprises the signal measured and receive from described neighbor base station further, to determine direction and the distance of the above neighbor base station.
4. method according to claim 1, further, wherein, the transmission characteristic of base station described in two or more is selected from the group be made up of time, frequency source, T/F source further.
5. method according to claim 1, wherein, is coordinated by central authorization the determination of characteristic.
6. method according to claim 1, wherein, really fixes between described base station characteristic and coordinates.
7. method according to claim 1, wherein, each in two or more base station periodically configures its antenna system to remove described empty wave beam.
8. method according to claim 1, wherein, the described empty wave beam of described two or more base station comprises territory, common footprint, and described two or more base station uses described empty wave beam in time-sharing multiplex mode.
9. method according to claim 1, comprises further: use directional beam to be formed and from the coordinated measurement of described neighbor base station to determine direction and the distance of described neighbor base station.
10. method according to claim 1, wherein, is coordinated by central authorization and described base station the determination of characteristic.
11. 1 kinds utilize the Wave beam forming of coordination to strengthen the method for wireless base station performance in the wireless network with multiple wireless base station, and described wireless base station has the antenna system can carrying out Wave beam forming, and described method comprises:
Utilize the receiver identification neighbor base station of at least one in described multiple wireless base station;
Determine by the characteristic of described neighbor base station used, for the capacity optimized in two or more base station and covering; And
Be configured based on the described antenna system of the characteristic determined to base station described in two or more, to produce beam pattern, to optimize capacity in two or more base station and covering based on predetermined standard by the transmission characteristic coordinated in base station described in two or more, wherein, described transmission characteristic is selected from the group be made up of through-put power, time, frequency source, T/F source.
12. methods according to claim 11, wherein, described beam pattern is included in the territory, common footprint of described two or more base station and uses frequency division.
13. methods according to claim 11, wherein, described beam pattern is included in the territory, common footprint of described two or more base station and uses timesharing-frequency division.
14. methods according to claim 11, wherein, described antenna configuration is selected from the configuration subset in the code book of directional diagram, the directional diagram having more weak beam pattern to select to have stronger beam pattern on the subscriber direction be associated with base station on the direction of neighbor base station.
15. methods according to claim 14, wherein, the code book of described directional diagram is used for base station and receives or send.
16. methods according to claim 14, wherein, described beam pattern is included in the territory, common footprint of described two or more base station and uses timesharing-frequency division.
17. methods according to claim 11, wherein, described antenna configuration is selected from the configuration subset in the code book of directional diagram, with the set direction directional diagram based on the empty beam pattern on neighbor base station direction.
18. methods according to claim 17, wherein, the code book of described directional diagram is used for base station and receives or send.
19. methods according to claim 11, wherein, described antenna configuration is selected from based on the configuration subset in the code book of the directional diagram subset of the direction of stronger beam pattern and the combination of empty beam pattern, makes to have stronger beam pattern on subscriber direction and the subset on the direction of neighbor base station with the code book of sky beam pattern is selected.
20. methods according to claim 19, wherein, the code book of described directional diagram is used for base station and receives or send.
21. methods according to claim 11, wherein, described beam pattern is included in the adjustment using through-put power in the territory, common footprint for two or more base station.
22. methods according to claim 11, wherein, described beam pattern is included in the territory, common footprint for two or more base station and uses timesharing.
23. 1 kinds of base stations utilizing the Wave beam forming of coordination to strengthen the property in the base station system, described base station comprises:
Base station broadcast interface transceiver system, it provides with the radio communication of relevant subscriber and performs Wave beam forming, and comprises the antenna system can carrying out Wave beam forming;
Second receiver, the signal be configured to other base stations send is measured;
Control unit, communicate with described base station broadcast interface transceiver system and described second receiver, to configure the antenna system of described base station broadcast interface transceiver system based on the characteristic of more than one neighbor base station to described base station broadcast interface transceiver system transmission instruction, thus produce the empty wave beam pointing to neighbor base station, to reduce the interference with this neighbor base station, to optimize capacity in base station described in two or more and covering based on predetermined standard by the transmission characteristic coordinated in base station described in two or more, wherein, described transmission characteristic is selected from by through-put power, time, frequency source, the group of T/F source composition.
24. base stations according to claim 23, wherein, described antenna configuration is selected from the configuration subset in the code book of directional diagram.
25. 1 kinds utilize the Wave beam forming of coordination to strengthen the method for wireless base station performance in the wireless network with multiple wireless base station, and described wireless base station has the antenna system can carrying out Wave beam forming, and described method comprises:
Utilize the receiver identification neighbor base station of at least one in described multiple wireless base station;
Determine by the characteristic of described neighbor base station used, for the capacity optimized in two or more base station and covering; And
Based on the characteristic determined, the described antenna system of base station described in two or more is configured to antenna configuration, described antenna configuration produces the beam pattern of the interference one or more neighbor base station to reduction, described beam pattern is selected from the directional diagram subset in the code book of directional diagram, wherein, capacity in two or more base station and covering is optimized by the transmission characteristic coordinated in base station described in two or more based on predetermined standard, wherein, described transmission characteristic is selected from the group be made up of through-put power, time, frequency source, T/F source.
26. methods according to claim 25, described code book is divided into two or more subset by the alignment regions comprised further based on stronger beam pattern, and for having the subset of base station selected described code book of stronger beam pattern on the direction of the relevant subscriber of base station, and the direction avoiding being used in neighbor base station has the subset of stronger beam pattern.
27. methods according to claim 25, comprise further, based on selected alignment regions, described code book are divided into two or more subset, and divide into groups to those directional diagrams in each alignment regions with strong beam pattern.
28. methods according to claim 25, comprise the combination based on the direction of stronger beam pattern and the direction of empty beam pattern further, described code book is divided into two or more subset, and for there is stronger beam pattern on the direction of relevant subscriber and there is the subset of the base station selected described code book of sky beam pattern on the direction of neighbor base station.
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| TWI487415B (en) * | 2011-05-02 | 2015-06-01 | Inst Information Industry | Network system, femtocell, femtocell management apparatus, resource allocation method and computer program product thereof |
| US8630677B2 (en) * | 2011-07-15 | 2014-01-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Distributed beam selection for cellular communication |
| KR101839808B1 (en) | 2011-08-24 | 2018-04-26 | 삼성전자주식회사 | Mobile Terminal and Communication Method, Base Station Control Apparatus and Method, and Multi-Point Transmission System and Method using the Same |
| CN104025656B (en) * | 2011-12-07 | 2018-08-17 | 爱立信(中国)通信有限公司 | Method and central base station for the interference management in cellular network |
| US9496929B2 (en) | 2012-04-06 | 2016-11-15 | Lg Electronics Inc. | Coordinated beamforming method in wireless access system, and apparatus therefor |
| US9008669B2 (en) | 2013-03-15 | 2015-04-14 | Smartsky Networks LLC | Wedge shaped cells in a wireless communication system |
| CN104718775B (en) * | 2013-09-12 | 2018-06-26 | 华为技术有限公司 | A kind of method for sending information, device and base station |
| JP6276577B2 (en) * | 2013-12-18 | 2018-02-07 | 日本電信電話株式会社 | Communication control system and communication control method |
| WO2015113282A1 (en) * | 2014-01-29 | 2015-08-06 | 华为技术有限公司 | Wireless communication network and device |
| EP3172845A4 (en) * | 2014-07-21 | 2018-04-11 | Ruckus Wireless, Inc. | Beamforming for a multi-user mimo group |
| US10142132B2 (en) * | 2015-12-30 | 2018-11-27 | Qualcomm Incorporated | System and method for reducing interference from neighboring wireless devices |
| CN111510313B (en) * | 2019-01-30 | 2021-09-14 | 华为技术有限公司 | Communication method, communication device, and storage medium |
| EP4026254B1 (en) * | 2019-09-06 | 2023-11-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods, computer program and radio network node for null-steering beamforming |
| CN113038613B (en) * | 2021-03-01 | 2022-06-03 | 中国人民解放军国防科技大学 | Three-dimensional network resource allocation method and device based on graph coloring problem |
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