CN101420746B - Method for interference coordination between cells and interference coordination information transmission method therefor - Google Patents
Method for interference coordination between cells and interference coordination information transmission method therefor Download PDFInfo
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Abstract
The invention relates to a method for transferring interference coordination information between cells and an interference coordination method, wherein, (1) the transfer method comprises the following steps: a baseband processing unit (102) determines edge microcells, the baseband processing unit (102) determines a neighborhood relation between the edge microcells (301); and the baseband processing unit (102) sends the interference coordination information data and/or control signaling between the edge microcells to the baseband processing unit of the neighbor cell; and (2) the interference coordination method comprises the following steps: the baseband processing unit (102) coordinates the interference between the cells for the edge microcell by combining the microcell measurement information from the present cell and the microcell measurement information from the neighbor cell. The method combines the characteristics of a distributed base station and gives an information transmission and interference coordination method between RRUs or the microcells, which can efficiently utilize space, time, frequency and power resources, and reduce traffic load on an X2 interface.
Description
Technical field
The present invention relates to mobile communication, be specifically related to a kind of inter-cell interference coordination method and the interference coordination mode of intelligence transmission thereof.
Background technology
The key problem of Inter-Cell Interference Coordination (ICIC:Inter-cell Interference Coordination) is to coordinate the use of Radio Resource in a plurality of minizones, needs to pay close attention to cell edge " the cellborder requires special attention " especially.To the space, coordinate by time and frequency channels resource and power in a plurality of minizones for ICIC, thereby reduce interference among adjacent cells.Interference coordination technique is a kind of interference cancellation techniques based on the base station.
Interference coordination technique has mainly comprised the interference coordination of time-frequency domain and the interference coordination of empty time-frequency domain.
The interference coordination of time-frequency domain is by the coordination of minizone, and the time-frequency domain channel resource of each cell downlink transmitting channel is subjected to certain restriction.As between neighbor cell, the total running time-frequency resource of a minizone part (can be whole) is divided into a plurality of subclass, each sub-district takies data and the signaling transmission that one or more subclass running time-frequency resources are used for Cell Edge User.Neighbor cell does not overlap at the running time-frequency resource subclass that cell edge takies.
The interference coordination technique of time-frequency domain can be divided into static state, and semi-static and dynamic time-frequency domain resources is coordinated.Static mode mainly is when plot planning, determines by minizone planning.The coordination of resource can be made amendment according to the variation of minizone load and business characteristic, but the time cycle of this change is generally longer.For semi-static mode, the cycle of resource allocation is higher than static mode.For dynamic coordination mode, implement resource allocation with high frequency.The gain that dynamical fashion can obtain is the highest, and still, the measurement and the information that need report expense very big, and need frequently carry out real time communication in a plurality of minizones.
The time-frequency domain interference coordination may combine with power control in some scheme, as the terminal for cell edge, can adopt bigger transmitted power, and for the user of center of housing estate, then needs to adopt lower transmitted power.
Based on the empty time-frequency domain interference coordination technique of smart antenna, be a kind of based on the space, the mode of the three-dimensional resource coordination of time and frequency domain.Because intelligent antenna technology can concentrate on descending transmission signal in the wave beam of a finite width, therefore, cell edge can by at different districts to wave beam, time-frequency domain resources coordinates to reduce the interference between signal.
A kind of basic scheme that solves presence of intercell interference is " soft-frequency reuse " or " partial frequency multiplexing ".This technology is divided into the m group with all subcarriers of ofdm system, different neighbor cell selects not on the same group subcarrier as boss's carrier wave of this sub-district, other subcarriers are as the auxiliary son carrier waves of this sub-district, boss's carrier wave to each sub-district is provided with different transmitting power thresholdings with auxiliary son carrier waves again, and the transmitting power thresholding of boss's carrier wave is higher than the transmitting power thresholding of auxiliary son carrier waves, determines cell boarder with the coverage of boss's carrier wave.What distribute from the cell centre to the cell edge is boss's carrier wave, and it can cover the scope of whole sub-district; What white space distributed is auxiliary son carrier waves, the inside of its coverage cell.Like this, for inside, sub-district, mainly adopt the auxiliary son carrier waves transmission data of lower-wattage, because closer from the base station, terminal can receive this sub-district signal clearly, and because auxiliary son carrier waves power is less, the interference between the neighbor cell is also smaller; And all adopt high power main carrier transmission data at each neighbor cell fringe region, what be in that the terminal of fringe region mainly receives is boss's carrier wave of different neighbor cells, because boss's carrier wave non-overlapping of different neighbor cells and be quadrature, so the phase mutual interference will reduce greatly.The patented technology of " soft-frequency reuse " or " partial frequency multiplexing " aspect has CN200510068133, " by the power programming of OFDM mobile communication system being coordinated the method for presence of intercell interference ", CN200610087983, " uplink channel interference is coordinated in the single frequency network method, base station, terminal and network ".In the long evolving system standard of present 3G (Third Generation) Moblie this method is being discussed. the defective of this technology is that the frequency resource of cell edge is restricted, and is difficult to support a large number of users and very high data rate.
The also integration scenario that combines with technology such as inter-cell interference cancellation of handlebar Inter-Cell Interference Coordination, reduce presence of intercell interference as much as possible, such as, the Chinese invention patent application " avoids the minizone implementation method and the device that disturbs to occur ", application number CN200610009117, main method is: be respectively the cell boundary users of using interference coordination and the cell boundary users of using interference eliminated and distribute the correspondent frequency resource as being used for the frequency resource that interference eliminated and interference coordination take, specifically can distribute the correspondent frequency resource in advance, also the frequency resource that can when business load changes and meet predetermined condition, distribute interference eliminated and interference coordination to take; Then, dynamically adjust according to the business load situation in the communication system and be used for the frequency resource that interference eliminated and interference coordination take.Realization of the present invention makes and can utilize two kinds of implementation methods of avoiding presence of intercell interference simultaneously in wireless communication system, thereby makes and realize separately mutual supplement with each other's advantages between two kinds of methods, to reduce limitation separately.
Aspect system's realization of ICIC, be a main subject under discussion in the present 3G LTE standard by transmitting the needed signaling of ICIC and information by X2 interface between the evolved eNodeB (eNodeB).At 3GPP LTE technical report TR R3.018 V0.5.0 (2006-09), Evolved UTRA andUTRAN; Radio Access Architecture and Interface (Release 7), the following system implementation of ICIC has been discussed: 1) the ICIC scheme 1, based on the ICIC scheme of explicit state information request and exchange between eNodeB; 2) the ICIC scheme 2, based on the ICIC scheme of the request of mourning in silence (Mute Request); 3) assembled scheme of ICIC mode 1 and ICIC mode 2.These several ICIC schemes all relate to information and the signaling that transmits support ICIC on X2 interface.
The information and the signaling technology that transmit on these existing ICIC technology, particularly X2 interface are based on all that traditional base station architecture proposes.In the future, by RF remote unit (RRU, Remote RadioUnit), baseband processing unit BBU (Base Band Unit) constitute at distributed base station, as patented technology 96194056.5, " distributed radio telecommunications system ", for another example, LM Ericsson Telephone Co., Ltd.; Huawei Tech Co., Ltd; Nippon Electric Company, Ltd.; Nortel Networks Ltd.; Siemens Company, " interface of communicating by letter between the wireless device Control Node that is used for radio base station and the remote radio devices node; device and method " WO/2005/034544//EP1671504//200480028557.0, this distributed base station is cheap because of it, lay convenient will being popularized day by day, in the wireless access network that distributed base station constitutes, the Inter-Cell Interference Coordination problem just is converted to the interference coordination between the RRU, comprises interference coordination between the RRU of same sub-district (or being referred to as same base station) and the interference coordination between neighbor cell (or being referred to as adjacent base station) RRU.Existing ICIC technology, particularly information that transmits on the X2 interface and signaling technology, can't effectively realize the interference coordination between the RRU under the distributed base station, need provide effective disturbance coordination method and information, signal transmission method at the design feature of the wireless access network of forming by distributed base station.
Summary of the invention
The technical issues that need to address of the present invention are how a kind of minizone (or being referred to as perhaps to be referred to as between distributed base station between BBU) interference coordination information transmitting methods that is applicable to the cellular radio communication network that is made of distributed base station is provided; At the design feature of the wireless access network of forming by distributed base station, provide the disturbance coordination method of (or being referred to as between RRU) between the effective Microcell, realize efficient utilization to space, time, frequency, power resource.Wherein, described distributed base station is made up of a baseband processing unit (BBU:Base Band Unit) and several far-end radio frequency units (RRU:Remote Radio Unit).Some portable terminals of some distributed base stations and service thereof constitute cellular radio Communication system.
Above-mentioned first technical problem of the present invention solves like this, a kind of Inter-Cell Interference Coordination information transmitting methods is provided, transmit Inter-Cell Interference Coordination information (or being referred to as perhaps to be referred to as between BBU) between distributed base station, specifically may further comprise the steps in the minizone:
1.1) this cell baseband processing unit (BBU) determines the edge Microcell;
This cell baseband processing unit (BBU) is distinguished the Microcell (that is: the edge Microcell or the second class Microcell) that is positioned at the Microcell (that is: center Microcell or first kind Microcell) in center of housing estate zone or is positioned at cell edge region according to the measurement result of wireless terminal in this cell coverage area;
1.2) this cell baseband processing unit (BBU) determines the neighbouring relations of edge Microcell;
1.3) interference coordination information data and/or the control signaling of this cell baseband processing unit (BBU) between baseband processing unit (BBU) the transmission edge of neighbor cell Microcell.
According to transmission method provided by the invention, described transmission method comprises that also this cell baseband processing unit sends the detection collection to described wireless terminal; According to the diverse location of wireless terminal in the sub-district, described detection element of set is plain to constitute the following two kinds of situations that exist: first kind of situation only comprises the Microcell distinguished symbol or the corresponding far-end radio frequency units distinguished symbol of this sub-district; Second kind of situation both comprised the Microcell distinguished symbol or the corresponding far-end radio frequency units distinguished symbol of this sub-district, also comprised the Microcell distinguished symbol or the corresponding far-end radio frequency units distinguished symbol of neighbor cell.
According to transmission method provided by the invention, it is to determine like this that Microcell distinguished symbol or corresponding far-end radio frequency units distinguished symbol are concentrated in described detection: the position with the best far-end radio frequency units of the signal quality that last time, the wireless terminal measurement reported is the center, with default distance is that radius is determined a geographic range, and the Microcell or the corresponding far-end radio frequency units that are in this geographic range are exactly the element of surveying in the collection.
According to transmission method provided by the invention, described transmission method comprises that also baseband processing unit determines the ownership Microcell of wireless terminal; The ownership Microcell of wireless terminal is to determine like this: the best far-end radio frequency units of the signal quality that the wireless terminal measurement is reported is as the ownership Microcell of this wireless terminal.
According to transmission method provided by the invention, the decision method that wireless terminal is positioned at the edge Microcell is: if the signal strength signal intensity that wireless terminal detects belongs to two or more sub-district greater than the Microcell of predetermined threshold, then the ownership Microcell of this wireless terminal is the edge Microcell; Otherwise the ownership Microcell of this wireless terminal is the center Microcell.
According to transmission method provided by the invention, described interference coordination information data and control comprise in the signaling following a kind of at least: 1. the edge Microcell sign of this sub-district or corresponding far-end radio frequency units sign; 2. sign of the Microcell in the neighbor cell or the corresponding interior far-end radio frequency units of neighbor cell identify.
Further, the sign of the Microcell in the neighbor cell is meant: the signal quality (or signal strength signal intensity) that wireless terminal detects in the edge of this sub-district of its ownership Microcell is greater than the Microcell in the neighbor cell of predetermined threshold.
Above-mentioned another technical problem of the present invention solves like this, a kind of inter-cell interference coordination method based on above-mentioned transmission method is provided, and comprehensive use of baseband processing unit (that is: this cell baseband processing unit) carried out Inter-Cell Interference Coordination from the Microcell metrical information of this sub-district Microcell metrical information and neighbor cell to the edge Microcell.
According to coordination approach provided by the invention, described metrical information comprises the metrical information that wireless terminal reports and/or far-end radio frequency units self is measured or the information of detection; The metrical information of described terminal to report comprises the signal quality data that this far-end radio frequency units corresponding with certain far-end radio frequency units distinguished symbol sends.
According to coordination approach provided by the invention, described coordination approach comprises service request and the resource operating position of baseband processing unit according to certain edge Microcell of this sub-district, and belong to service request and resource operating position in the edge Microcell of other sub-district with this edge Microcell plurality of adjacent, between these edge Microcells, carry out scheduling of resource, described resource comprises the space, one or more in time, frequency and the power resource.
According to coordination approach provided by the invention, belong under the situation of different districts (being that some edge Microcells of phase mutual interference or resource contention that exist are by different baseband processing unit control) at some edge Microcells of phase mutual interference or resource contention that exist, described coordination approach comprises: 1) baseband processing unit is by X2 interface interactive interference harmony messages data; 2) baseband processing unit is coordinated control information by the X2 interface interactive interference.
According to coordination approach provided by the invention, described coordination approach comprises that also baseband processing unit uses this sub-district Microcell metrical information that the some Microcells that belong to same sub-district that have phase mutual interference or resource contention are carried out Inter-Cell Interference Coordination or scheduling of resource, and described resource comprises one or more in space, time, frequency and the power resource.
The disturbance coordination method and the interference coordination mode of intelligence transmission thereof between a kind of Microcell provided by the invention, utilized the design feature of the wireless access network of distributed base station composition, information transferring method of (or being referred to as between the Microcell) and disturbance coordination method can be to the efficient utilizations of space, time, frequency, power resource between the RRU that provides, and minizone information that the present invention simultaneously provides and signaling transfer approach have reduced the traffic on the X2 interface between the base station effectively.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
A kind of wireless access network that constitutes by distributed base station of Fig. 1;
Inter-Cell Interference Coordination information transferring method between a kind of distributed base station of Fig. 2;
Interference coordination embodiment between a kind of distributed base station of the present invention of Fig. 3.
Embodiment
At first, the inventive method scope of application is described:
The individual layer wireless access network that distributed base station constitutes, as shown in Figure 1, wireless access network comprises two or more distributed base station D_NodeB (Distributed node Base station), comprises several wireless terminals 103.D_NodeB comprises 102 and one groups of RF remote units of a baseband processing unit BBU (Base BandUnit) (RRU, Remote Radio Unit) 101, each RRU101 covers a Microcell 105, one group of Microcell 105 that is covered by RRU101 constitutes the sub-district 104 or the sector of distributed base station, and each RRU sends its distinguished symbol in the Microcell of its covering.The Microcell that adjacent R RU covers spatially exists overlaps, and covers to realize no gap.The BBU of distributed base station realizes communication and control to the RRU that belongs to this machine station by optical fiber link 106; Belong to the cancellated interface that constitutes by optical fiber link between the BBU of different distributions formula base station and realize communication.This cancellated interface can be the interface that meets certain communication standard, as X2 interface.
The double layered wireless access network that distributed base station constitutes: wireless access network comprises two or more distributed base station D_NodeB (Distributed node Base station), comprises several wireless terminals 103.D_NodeB comprises 102 and one groups of RF remote units of a baseband processing unit BBU (Base Band Unit) (RRU, Remote Radio Unit) 101, and each RRU101 sends its distinguished symbol in the Microcell of its covering.In this group RRU101, there is a main RRU101 (being to be positioned at the centre of sub-district 104 and the represented RRU of triangle that is filled by black among Fig. 1), all the other are attached RRU101, each attached RRU covers a Microcell, one group of Microcell that is covered by attached RRU constitutes the sub-district or the sector of distributed base station, main RRU covers the sub-district or the sector of this distributed base station, and main RRU realizes double-deck the covering with attached RRU.The Microcell that adjacent attached RRU covers spatially exists overlaps, and covers to realize no gap.The BBU of distributed base station realizes communication and control to main RRU and the attached RRU that belongs to this machine station by optical fiber link 106; Belong to the cancellated interface that constitutes by optical fiber link between the BBU of different distributions formula base station and realize communication.This cancellated interface can be the interface that meets certain communication standard, as X2 interface.
In above-mentioned two kinds of systems, residing geographical position, overlay area (being referred to as Microcell) difference according to the RRU101 that forms a distributed base station, these Microcells (perhaps little sector) are divided into two base class, 1. first kind Microcell (center Microcell): be the Microcell that is in distributed base station overlay area 104 (being referred to as the sub-district) inner zone, the characteristics of this class Microcell are: only exist with the interference between the adjacent Microcell in sub-district, and and belong to that interference between the Microcell of adjacent sub-district is little must be able to not considered; 2. the second class Microcell (edge Microcell): be the Microcell that is in distributed base station overlay area (being referred to as the sub-district) border belt, as having the Microcell of shade among Fig. 1, the characteristics of this class Microcell are: both existed and with the interference between the adjacent Microcell in sub-district, also had and belong to interference between the adjacent Microcell of adjacent sub-district.
In second step, illustrate that the present invention transmits the method for Inter-Cell Interference Coordination information between distributed base station:
(1) because first kind Microcell is the Microcell that is in distributed base station overlay area (being referred to as the sub-district) inner zone, this class Microcell only exists and with the interference between the adjacent Microcell in sub-district, and and the interference that belongs between the Microcell of adjacent sub-district little as can not consider, therefore, need not between the base station, transmit data relevant and control signaling with the interference coordination of first kind Microcell.
(2) basic skills of transmission Inter-Cell Interference Coordination information is between distributed base station: BBU mails to specific neighbor cell to the data relevant with the interference coordination coordination of specific Microcell.
The edge Microcell is the aforementioned second class Microcell; Coordinate relevant data with interference coordination and comprise a kind of of following data at least: the Microcell sign in this sub-district (perhaps RRU sign); Microcell sign in the adjacent sub-district (perhaps RRU sign); The Resource Block subclass that current moment is using; The Resource Block subclass that eNodeB will use with high probability; ENodeB will be with the obsolete Resource Block subclass of high probability.The method is characterized in that: the data that BBU sends toward neighbor cell comprise following a kind of at least: the 1) Microcell of this sub-district sign (perhaps RRU sign); 2) sign of the Microcell in the neighbor cell (perhaps RRU sign).
As shown in Figure 2, transfer approach of the present invention specifically may further comprise the steps:
201) BBU determines the second class Microcell, specifically:
1) BBU sends detection collection by Microcell distinguished symbol (perhaps RRU distinguished symbol) sign to wireless terminal, specifies the signal of specific Microcell RRU emission, as pilot signal or synchronizing signal, frequency, coded system, measurement window etc.The characteristics of this detection collection are: both comprised the Microcell distinguished symbol (perhaps RRU distinguished symbol) of this sub-district, also comprised the Microcell distinguished symbol (perhaps RRU distinguished symbol) of neighbor cell.Determine that the method for surveying Microcell distinguished symbol (perhaps RRU distinguished symbol) in the collection is: the position of the RRU that the signal quality that wireless terminal measurement in the past reports is best is the center, with default distance is that radius is determined a geographic range, the RRU that is in this geographic range is exactly the element of surveying in the collection, belong to neighbor cell if the RRU in this geographic range has, just have a possibility that is positioned at border class Microcell.
2) wireless terminal reports surveying the measurement result of the RRU signal in the collection;
3) BBU judges according to the measurement result of RRU signal whether the Microcell of this RRU or this RRU correspondence is the second class Microcell.Concrete grammar is: be positioned at the second class sub-district if the signal strength signal intensity of surveying one or more Microcell that belongs to neighbor cell in the collection greater than predetermined threshold, just is judged to portable terminal;
202) BBU analyzes the neighbouring relations of the second class Microcell, specifically:
1) selects the RRU that belongs to other sub-districts that interior its signal strength signal intensity of detection collection surpasses predetermined threshold;
2) determine according to the distinguished symbol of these RRU which sub-district these RRU belong to, in view of the above, make up the data structure of describing these second class sub-district neighbouring relations;
203) data that BBU is relevant with relevant neighbor cell intercommunication Inter-Cell Interference Coordination, control signaling.
The neighbouring relations that the data structure of the second class sub-district neighbouring relations is described, BBU mails to specific neighbor cell to this second class Microcell data relevant with the interference coordination coordination, control signaling, and BBU receives the data relevant with the interference coordination coordination, the control signaling of sending from adjacent sub-district where necessary.
The data of BBU and neighbor cell intercommunication comprise following a kind of at least: the 1) sign of the Microcell in this sub-district (perhaps RRU sign); 2) sign of the Microcell in the adjacent sub-district (perhaps RRU sign);
In the 3rd step, disturbance coordination method of the present invention is described:
The BBU of a distributed base station realizes interference coordination to the center Microcell under it with centralized control, and the edge Microcell under it is realized interference coordination between Microcell with distribution control mode.
(1) method of centralized control interference coordination is: BBU only makes and is used for the metrical information of the Microcell in this sub-district and realizes scheduling of resource, and these resources that are scheduled comprise a kind of of following resource at least: space, time, frequency, power resource.
The metrical information of the Microcell in the sub-district comprises a kind of of following information: the information that the terminal measurement reports; RRU measures the information of (or detection);
The information that the terminal measurement reports comprises: the signal quality data that this RRU corresponding with certain RRU distinguished symbol sends;
The information that RRU measures (or detection) comprises: the radio bearers indication corresponding with this RRU;
(2) method of distribution control mode interference coordination is: the comprehensive interference coordination that carries out the minizone from the Microcell metrical information of this sub-district Microcell metrical information and neighbor cell that uses of BBU.
BBU is according to the service request and the resource operating position of certain second class Microcell of this sub-district, and and this second class Microcell between exist to disturb and the neighbor cell of shared resources in the service request and the resource operating position of the second class Microcell, between these Microcells, carry out scheduling of resource, these resources comprise a kind of of following resource at least: space, time, frequency, power resource.
BBU is by the relevant data with interference coordination of the mutual second class Microcell in X2 interface and adjacent sub-district.
At last, further describe the present invention in conjunction with concrete application of the present invention:
(1) system
As shown in Figure 3, the wireless access network that a kind of distributed base station is formed, this wireless access network comprises a plurality of distributed base station D_NodeB (Distributed node Base station) and a plurality of wireless terminal 103.D_NodeB comprises 102 and one groups of RF remote units of a baseband processing unit BBU (Base Band Unit) (RRU, Remote Radio Unit) 101, one group of Microcell 105,301 that is covered by RRU101 constitutes the coverage cell 104 of distributed base station, each RRU sends its distinguished symbol in the Microcell of its covering, the channel that is used for its use of terminal recognition is from which RRU.RRU in the distributed base station edge zone has adopted three fan antennas, and each sector covers a Microcell 301.
In the sub-district 104 that distributed base station covers, there are two class Microcells, first kind Microcell is the Microcell 105 that is in distributed base station overlay area 104 inner zone, 105 Microcells with this sub-district of Microcell are adjacent, only there is the interference between the Microcell with this sub-district, and and belong to that interference between the Microcell of adjacent sub-district is little must be able to not considered; The second class Microcell is the Microcell 301 that is in distributed base station overlay area (being referred to as the sub-district) border belt, as having the Microcell of shade among Fig. 3, the characteristics of this class Microcell are: both existed and the Microcell of this sub-district between interference, also have and belong to interference between the Microcell of adjacent sub-district.
Carrying out the intercommunication of data between the RRU that the BBU of the distributed base station here and its have under its command by the CPRI standard interface, also can be to adopt OBSAI (Open Base Station ArchitectureInitiative: the Open Base Station Architecture) intercommunication between interface realization BBU and the RRU.
Realize communication by X2 interface between the BBU102 of adjacent distributed base station.
In the wireless access network that described distributed base station is formed, disturbance coordination method comprises following steps between a kind of realization (two) Microcell:
The BBU of a distributed base station realizes interference coordination to the center Microcell under it with centralized control, and the edge Microcell under it is realized interference coordination between Microcell with distribution control mode.
1. the method for centralized control interference coordination is: BBU only makes and is used for the metrical information of the Microcell in this sub-district and realizes scheduling of resource, and these resources that are scheduled comprise a kind of of following resource at least: space, time, frequency, power resource.
The metrical information of the Microcell in the sub-district comprises a kind of of following information: the information that the terminal measurement reports; RRU measures the information of (or detection);
The information that the terminal measurement reports comprises: the signal quality data that this RRU corresponding with certain RRU distinguished symbol sends;
The information that RRU measures (or detection) comprises: the radio bearers indication corresponding with this RRU;
2. the method for distribution control mode interference coordination is: the comprehensive interference coordination that carries out the minizone from the Microcell metrical information of this sub-district Microcell metrical information and neighbor cell that uses of BBU.
BBU is according to the service request and the resource operating position of certain second class Microcell of this sub-district, and and this second class Microcell between exist to disturb and the neighbor cell of shared resources in the service request and the resource operating position of the second class Microcell, between these Microcells, carry out scheduling of resource, these resources comprise a kind of of following resource at least: space, time, frequency, power resource.
Comprise that from the metrical information of this sub-district Microcell a kind of of following information or this are multiple: the information that the terminal measurement in the second class Microcell reports; Measure the information of (or detection) by the RRU in the second class Microcell;
The information that the terminal measurement reports comprises: the signal quality data that this RRU corresponding with certain RRU distinguished symbol sends;
The information of being measured (or detection) by this sub-district RRU comprises: the radio bearers indication corresponding with this RRU;
BBU is by the relevant data with interference coordination of the mutual second class Microcell in X2 interface and adjacent sub-district.
Claims (12)
1. an Inter-Cell Interference Coordination information transmitting methods is characterized in that, transmits Inter-Cell Interference Coordination information between distributed base station, specifically may further comprise the steps:
1.1) this cell baseband processing unit (102) determines the edge Microcell:
This cell baseband processing unit (102) is distinguished the edge Microcell (301) that is positioned at the center Microcell (105) in center of housing estate zone or is positioned at cell edge region according to the measurement result of wireless terminal (103) in this cell coverage area;
1.2) this cell baseband processing unit (102) determines the neighbouring relations of edge Microcell (301);
1.3) interference coordination information data and/or the control signaling of this cell baseband processing unit (102) between the baseband processing unit transmission edge of neighbor cell Microcell.
2. according to the described transmission method of claim 1, it is characterized in that described transmission method comprises that also this cell baseband processing unit (102) sends the detection collection to described wireless terminal (103); Described detection element of set element comprises the Microcell distinguished symbol or corresponding far-end radio frequency units (101) distinguished symbol of this sub-district, the Microcell distinguished symbol or corresponding far-end radio frequency units (101) distinguished symbol that had perhaps both comprised this sub-district also comprise the Microcell distinguished symbol or corresponding far-end radio frequency units (101) distinguished symbol of neighbor cell.
3. according to the described transmission method of claim 2, it is characterized in that, it is to determine like this that Microcell distinguished symbol or corresponding far-end radio frequency units (101) distinguished symbol are concentrated in described detection: the position of measuring the best far-end radio frequency units of the signal quality that reports with wireless terminal last time (103) is the center, with default distance is that radius is determined a geographic range, and the Microcell or the corresponding far-end radio frequency units that are in this geographic range are exactly the element of surveying in the collection.
4. according to the described transmission method of claim 2, it is characterized in that described transmission method comprises that also baseband processing unit determines the ownership Microcell of wireless terminal; The ownership Microcell of wireless terminal is to determine like this: the best far-end radio frequency units of the signal quality that the wireless terminal measurement is reported is as the ownership Microcell of this wireless terminal.
5. according to the described transmission method of claim 2, it is characterized in that, the decision method that wireless terminal (103) is positioned at edge Microcell (301) is: the signal strength signal intensity that wireless terminal detects belongs to two or more sub-district greater than the Microcell of predetermined threshold, and then the ownership Microcell of this wireless terminal is edge Microcell (301); Otherwise the ownership Microcell of this wireless terminal is center Microcell (105).
6. according to the described transmission method of claim 1, it is characterized in that, comprise the edge Microcell sign or the far-end radio frequency units sign of this sub-district in described interference coordination information data and the control signaling.
7. according to the described transmission method of claim 1, it is characterized in that, comprise Microcell sign or far-end radio frequency units sign in the neighbor cell in described interference coordination information data and the control signaling.
8. inter-cell interference coordination method based on the described transmission method of claim 1, it is characterized in that comprehensive use of baseband processing unit (102) carried out Inter-Cell Interference Coordination from the Microcell metrical information of this sub-district Microcell metrical information and neighbor cell to the edge Microcell.
9. described according to Claim 8 coordination approach is characterized in that, described metrical information comprises the metrical information that wireless terminal (103) reports and/or far-end radio frequency units self is measured or the information of detection; The metrical information of described terminal to report comprises the signal quality data that this far-end radio frequency units corresponding with certain far-end radio frequency units distinguished symbol sends.
10. described according to Claim 8 coordination approach, it is characterized in that, described coordination approach comprises service request and the resource operating position of baseband processing unit (102) according to certain edge Microcell of this sub-district, and belong to service request and resource operating position in the edge Microcell of other sub-district with this edge Microcell plurality of adjacent, carry out scheduling of resource between these edge Microcells, described resource comprises one or more in space, time, frequency and the power resource.
11. described according to Claim 8 coordination approach is characterized in that, described coordination approach comprises: baseband processing unit is by X2 interface interactive interference harmony messages data and interference coordination control information.
12. described according to Claim 8 coordination approach, it is characterized in that, described coordination approach comprises that also baseband processing unit (102) uses this sub-district Microcell metrical information that the some Microcells that belong to same sub-district that have phase mutual interference or resource contention are carried out Inter-Cell Interference Coordination or scheduling of resource, and described resource comprises one or more in space, time, frequency and the power resource.
Priority Applications (1)
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