CN101690291B - Downlink transmission system and method for borrowing spectrum resources and channel resources from adjacent cells - Google Patents
Downlink transmission system and method for borrowing spectrum resources and channel resources from adjacent cells Download PDFInfo
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Abstract
A downlink transmission system and method for borrowing spectrum resources and channel resources from adjacent cells are disclosed. In the above downlink transmission system, the wireless node of the cell that the terminal is in uses part or all of the resource blocks in its transmitting channel and transmitting frequency band, and the adjacent cells of the cell that the terminal is in use part or all of the resource blocks in their respective transmitting channels and transmitting frequency bands, to transmit service data to the terminal together in single stream mode. With the present invention, a problem of the spectrum borrowing being restricted by multiple cells that exists in the relevant technique can be overcome, and the area served by the frequency bands of multiple cells together which is accepted by a terminal is increased on the premise of maintaining the frequency space multiplexing layout unchanged and the adjacent cells interference restricted, thereby improving the transmission rate of terminals locating at the edge of a cell.
Description
Technical field
The present invention relates to the communications field; Particularly; Relate to the downlink transmission system and the method for using neighbor cell frequency spectrum resource and channel resource, above-mentioned downlink transmission system and method are used to use emission system terminal to this sub-district on the frequency spectrum of the neighbor cell of using of neighbor cell to launch data.
Background technology
Inter-Cell Interference Coordination (Inter-cell Interference Coordination; Abbreviate ICIC as) key problem be to coordinate the use of Radio Resources in a plurality of minizones, need to pay close attention to cell edge (" the cell border requires special attention ") especially.ICIC coordinates space, time and frequency channels resource and power in a plurality of minizones, thereby reduces interference among adjacent cells.
The interference coordination technique of time-frequency domain can be divided into static state, time-frequency domain resources semi-static and dynamical fashion is coordinated.Static mode mainly is when carrying out plot planning, confirms through minizone planning.The coordination of resource can be made amendment according to the variation of minizone load and business characteristic, but this-time cycle that * * kind changes 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 frequent.The gain that dynamical fashion can obtain is the highest, and still, the measurement and the information reporting expense that need are very big, and need frequently carry out real time communication in a plurality of minizones.
A kind of basic scheme that solves presence of intercell interference is " soft-frequency reuse " or " partial frequency multiplexing ".This technology is with OFDM (Orthogonal Frequency Division Multiple; OFDM) all subcarriers of system are divided into the m group; 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 and auxiliary son carrier waves to each sub-district is provided with the distinct transmit power threshold again, and the transmitting power thresholding of boss's carrier wave is higher than the transmitting power thresholding of auxiliary son carrier waves, and confirms cell boarder with the coverage of boss's carrier wave.What from the cell centre to the cell edge, distribute 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 it is closer from the base station; Therefore the terminal can receive this sub-district signal clearly, and because auxiliary son carrier waves power is less, so 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.It is the CN200510068133 one Chinese patent application of " through the power programming of OFDM GSM being coordinated the method for presence of intercell interference " that " soft-frequency reuse " or " partial frequency multiplexing " relevant patented technology has title, and title is the CN200610087983 one Chinese patent application of " uplink channel interference is coordinated in the SFN 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.
For the problem that the frequency resource of alleviating the cell edge that " soft-frequency reuse " exist is restricted, a basic thinking is to improve the frequency reuse of cell edge, and that just breaks fringe region fixedly takes coefficient, the restriction as 1/3.Technology motion: 3GPP R1-051059 (Inter-cell interference mitigation for EUTRA.Texas Instruments; 3GPP RAN WG1#42bis, San Diego, California; US; October 2005) thinking providing is exactly: when the load of adjacent sub-district was light, the frequency of using adjacent sub-district improved the transmission rate of the edge termination of this sub-district, and Fig. 1 shows the sketch map of this method.In the R1-051059 scheme, inside, sub-district is can subtract power to use whole frequency ranges, but cell edge no longer be fix 1/3, but adjust according to the difference of edge load between adjacent cell.When certain Cell Edge User more after a little while, its usable frequency will be less than 1/3, simultaneously, when its contiguous cell edge load was heavier, the edge usable frequency of adjacent cell will be above 1/3.If all Cell Edge User loads are all heavier, then the usable frequency of each cell edge all is 1/3.
With reference to Fig. 1, the method for the used frequency soft multiplexing in edge, minizone that the R1-051059 scheme provides is following: suppose that the edge load of sub-district 1 is heavier at first constantly; And the edge load of its 2,4,6 contiguous sub-districts is all lighter, and the edge load of 3,5,7 sub-districts is general, at this moment; 3,5,7 cell edges still take 1/3 frequency range; 2, the edge customer use that the next part frequency is given sub-district 1 is then economized in 4,6 sub-districts, and at this moment, the edge customer of sub-district 1 takies frequency range and surpasses 1/3.The edge load of sub-district 1 is general constantly to have supposed M, and the edge load of its 2,4,6 contiguous sub-districts is heavier; And 3, the edge load of 5,7 sub-districts is all lighter; Then according to this scheme, the 1st cell edge distributes 1/3 original available frequency band, and 3,5,7 sub-districts are then economized the next part frequency and used for 2,4,6 Cell Edge User; At this moment, 2,4,6 Cell Edge User usable frequencies surpass 1/3 original usable frequency.
The emission system of this sub-district of above-mentioned use on the adjacent cell spectrum of using in the method for the terminal of this sub-district emission data, the precondition of using its used frequency in edge from other sub-districts is: must be contiguous all cell edges that use these frequencies all load more just can use.Such as in Fig. 1, M even the edge load of sub-district 3,5 is all extremely light, and the edge customer of sub-district 7 is more constantly, and just can not use frequency from 3,5,7 sub-districts this moment.Fig. 1 only shows the situation of 7 adjacent cell structures, is 1/3 networking model for frequency reuse, also is to have same problem.When between operating frequency is three neighbor cells of f1, f2, f3, using frequency spectrum; Such as operating frequency is that the sub-district of f1 is will use f2 the time; With operating frequency be that two adjacent f2 sub-districts of sub-district of f1 all need very light load and just can use; In other words, when to operating frequency being the part or all of Resource Block of edge termination frequency of utilization f2 of sub-district of f1, operating frequency is that two neighbor cells of the sub-district of f1 all possibly be interfered.
Summary of the invention
The emission system of considering this sub-district of use that exists in the correlation technique is used to the terminal of this sub-district emission data time-frequency spectrum on the frequency spectrum of the adjacent sub-district of using and restricted by a plurality of sub-districts; And the neighbor cell of this sub-district problem that possibly be interfered and propose the present invention; For this reason, the present invention aims to provide a kind of emission system of using adjacent sub-district technology to the terminal of this sub-district emission data on the frequency spectrum of the adjacent sub-district of using.
According to an aspect of the present invention, a kind of downlink transmission system of using adjacent cell spectrum resource and channel resource is provided.
This downlink transmission system comprises a plurality of adjacent or contiguous radio node and at least one terminal; Said a plurality of radio node uses identical according to the requirement of channeling or the distinct transmit frequency band provides professional to the terminal of its service area, and there is overlapping in the institute's region covered that transmits of adjacent radio node.Wherein, The radio node of sub-district, place, terminal uses the part or all of Resource Block in its transmission channel, its emission band; And the radio node of place, terminal adjacent cells of cells uses separately transmission channel and the interior part or all of Resource Block of emission band, sends business datum with the single current mode to said terminal jointly.
Wherein, The single current mode is meant; System is sending in the process of business datum to the terminal, all carries the data that belong to same transport block set on the Resource Block of the Resource Block of the radio node of the sub-district adjacent with sub-district, wireless terminal place and the radio node of sub-district, place, terminal.
Preferably, system is sending in the process of business datum to the terminal, and the radio node of the radio node of neighbor cell and sub-district, place, terminal is adjusted its transmitting power on particular resource block respectively according to the channel quality indication of terminal to report.And, system can be simultaneously or timesharing ground use whole or Resource Block and all or part of Resource Block that the terminal belongs to the radio node of sub-district of the radio node of neighbor cell to send business datum.
Preferably, above-mentioned radio node comprises: the remote radio unit of base station, distributed base station independently; The antenna of radio node comprises: be arranged in different sites antenna, be arranged in the antenna of the covering zones of different of same site.
Preferably, above-mentioned terminal is to from the different radio node and have the signals in different frequency bands unification and carry out down-conversion and Base-Band Processing; And, the data that send to the terminal are distinguished from the transmission data of corresponding radio node according to linear superposition theorem; And the terminal comprises channel quality indication (CQI) information and the channel quality indication (CQI) information on the neighbor cell radio node frequency spectrums of operation on the radio node frequency spectrums of operation of sub-district, terminal place to the channel quality indication (CQI) information that network side reports.
Above-mentioned terminal is meant the terminal that is positioned at cell edge region.
Above-mentioned Resource Block be following any: the interval frequency spectrum of a corresponding special time; The interval sub carrier group of a corresponding special time in the orthogonal frequency division multiplexed.
According to a further aspect in the invention, a kind of downlink transmission method of using neighbor cell frequency spectrum resource and channel resource is provided.
Downlink transmission method according to the present invention comprises following processing: the definite set that can participate in the preliminary election adjacent cell radio node of single-stream transmission; From the set of preliminary election adjacent cell radio node, select to participate in one or more work radio nodes of single-stream transmission; The business datum that needs is sent to the terminal sends to the single-stream transmission radio node, and wherein, the single-stream transmission radio node comprises: one or more work radio nodes, the radio node of sub-district, place, terminal; The single-stream transmission radio node sends business datum with the single current mode to the terminal.
Preferably, confirm that the operation of preliminary election adjacent cell radio node collection is specially: the detection collection that is made up of one group of adjacent cell distinguished symbol sign is sent to the terminal in the base station, wherein, surveys the signal that collection has been specified specific adjacent cell radio node emission; Terminal to report is to surveying the measurement result of the signal that collects appointment; Network side judges according to the measurement result of terminal to report whether the signal quality of respective cell reaches threshold value, and the radio node of sub-district that will reach threshold value is as participating in the preliminary election adjacent cell radio node of single-stream transmission.
Preferably, the operation of the one or more work radio nodes of above-mentioned selection is specially: for the corresponding adjacent cell of preliminary election adjacent cell radio node, judge whether to exist resources left according to its overload indication information; Each adjacent cell for there being resources left obtains resource residual amount respectively, and obtains the application resource borrowing amount of its adjacent cell to it; For removing the adjacent cell that the surplus yield of using after the resource still reaches threshold value, with its radio node as the work radio node.
Preferably, the above-mentioned operation that business datum is sent to the single-stream transmission radio node comprises: the digital baseband form of the data in the transport block set with the I/Q two-way is assigned on the Resource Block of single-stream transmission radio node.
In the technique scheme of the present invention at least one can realize following beneficial effect: data are launched at emission system (transmission channel) terminal to this sub-district on the frequency spectrum of this adjacent sub-district of using through using adjacent sub-district; Can overcome the frequency spectrum that exists in the correlation technique and use a plurality of these problems of sub-district restriction that receive; In addition; Dynamically adjust the common region covered in adjacent sub-district through combining the power control measure; Can under the controlled prerequisite of the constant and adjacent area interference of holding frequency spatial reuse general layout, improve the zone that many subdistrict frequency bands common service is accepted at the terminal, thereby improve the transmission rate at the terminal that is positioned at cell edge.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the minizone frequency borrowing method of correlation technique;
Fig. 2 is the sketch map according to the downlink transmission system of the embodiment of the invention;
Fig. 3 sends the sketch map of business datum according to the embodiment of the invention with the single current mode;
Fig. 4 is the flow chart according to the downlink transmission method of the embodiment of the invention;
Fig. 5 is a sketch map of using the downlink traffic transmission instance of adjacent cell spectrum between the distributed base station internal node according to the embodiment of the invention.
Embodiment
As stated; In view of the emission system of this sub-district of use that exists in the correlation technique in the problem that has restriction on the frequency spectrum of the adjacent sub-district of using during to the terminal of this sub-district emission data at frequency spectrum aspect using; The present invention has provided a kind of emission system (transmission channel) of using adjacent sub-district scheme to the terminal of this sub-district emission data on the frequency spectrum of the adjacent sub-district of using; In other words; In technical scheme provided by the invention, the frequency spectrum resource of adjacent sub-district is not only used in this sub-district, also uses the transmission channel of adjacent sub-district.
Wherein, The frequency spectrum resource mode of using can have multiple; Such as, between the wireless terminal of wireless terminal and neighbor cell, share the cell edge frequency spectrum resource that belongs to different districts respectively through the mode that adopts united frequency hopping on the common band that covers different districts edge frequency spectrum resource at.
In addition, the terminal of mentioning in the present invention mainly is meant the terminal that is positioned at cell edge, but is not limited thereto, and the Resource Block of mentioning among the present invention can be but be not limited to following any: the 1) frequency spectrum in the corresponding special time interval; 2) sub carrier group in the corresponding special time interval in the orthogonal frequency division multiplexed.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Embodiment one
According to the embodiment of the invention, a kind of downlink transmission system of using adjacent cell spectrum resource and channel resource is provided at first.This downlink transmission system also can be called descending single-current transmission system vividerly,
Fig. 2 has provided the sketch map according to adjacent cell spectrum resource of using of the embodiment of the invention and channel resource downlink transmission system.As shown in Figure 2; This downlink transmission system comprises that a plurality of adjacent or contiguous radio nodes (have illustrated seven radio node 201a～201g) and at least one terminal and (a terminal (User Equipment who is positioned at sub-district, radio node 201a place have been shown among Fig. 2 among Fig. 2; UE) 202; Wherein, The radio node of a plurality of vicinities uses identical or different emission band to provide professional to the terminal of its service area according to the requirement of channeling, and there is overlapping in the institute's region covered that transmits of adjacent radio node.Wherein, the Traffic Channel at 203 expression terminals, the Resource Block (BRB1～BRBn) form of its Resource Block (SRB) and other sub-districts of using by Serving cell.
The radio node of a plurality of vicinities uses identical or distinct transmit frequency band to provide business to be meant to the terminal of its service area according to the requirement of channeling: 1) for the terminal of the inside of radio node cell covered; Realize channeling between the sub-district that radio node is adjacent with multiplexing factor 1; In this case, each radio node can use identical frequency spectrum to be the inner terminal service in its sub-district; 2) in the fringe region of radio node overlay area; But contiguous on the geographical position belong between the wireless terminal of different districts fringe region and will produce interference, a kind of method of this interference of avoiding is: each sub-district is at the different frequency spectrum of its fringe region use.Though this method can be avoided the interference between the edge termination of adjacent sub-district,, available the spectral bandwidth at the terminal that is in fringe region of each sub-district significantly reduces.The basic skills that the present invention addresses this problem is: the available bandwidth that improves edge termination through shared frequency spectrum in adjacent minizone and transmission channel; Shared bandwidth both can carry out between the frequency band of the quadrature separately (mutual exclusion) that cell edge region is used; Also can in the whole system available band, carry out, this actual loading situation according to each sub-district is decided.
Wherein, The radio node of sub-district, 202 place, terminal (for example; Radio node 201a shown in Figure 2) use part or all of Resource Block in its transmission channel, its emission band, and the radio node of several place, terminals adjacent cells of cells (for example, shown in Figure 2 radio node 201b, 201g, 201f) uses separately transmission channel and part or all of Resource Block (the Resource Block in the emission band; Abbreviate RB as), send business datum with the single current mode to the terminal jointly.
System can be simultaneously or timesharing ground use whole or Resource Block and all or part of Resource Block that the terminal belongs to the radio node of sub-district of the radio node of neighbor cell to send business datum.A kind of system uses all or part of Resource Block of radio node of sub-district, whole or Resource Block and terminal place of the radio node of neighbor cell to send business datum with the mode of timesharing example is: wireless terminal receives data with the mode of frequency hopping from contiguous or adjacent radio node.
Above-mentioned single current mode is meant: sending in the process of business datum to terminal 202; The radio node of adjacent sub-district (for example; Radio node 201b, 201g, 201f shown in Figure 2) the Resource Block of radio node (for example, shown in Figure 2 radio node 201a) of sub-district, Resource Block and terminal place on all carry the data that belong to same transport block set.Particularly; Passing through the different radio node before wireless terminal emission data; Earlier these data are carried out unified orthogonal transform,, to the different frequency bands of different radio nodes, send the data allocations in the same transport block set that forms like invert fast fourier transformation.
Particularly, Fig. 3 shows the sketch map that sends business datum with the single current mode.As shown in Figure 3; Serving cell (or is called this sub-district; For example; Radio node 201a belongs to the sub-district) Resource Block SBR set on the Resource Block set of part Resource Block, adjacent sub-district 1 (for example, sub-district, radio node 201b place) in the Resource Block set of part Resource Block BRB1, adjacent sub-district 2 (for example, sub-district, radio node 201g place) in the Resource Block set of the adjacent sub-district n of part Resource Block BRB2...... in part Resource Block BRBn on carry the data in the same transport block set.
For the flexibility that realizes; Also can use the part Resource Block BRBn in the Resource Block set of the adjacent sub-district n of part Resource Block BRB2...... in the Resource Block set of part Resource Block BRB1 in the Resource Block set of the adjacent sub-district 1 of part Resource Block in Resource Block (SRB) set of Serving cell, adjacent sub-district 2, use the Resource Block in one or more adjacent cell to transmit the data in the same transport block set at every turn with the mode of time-division.When the Resource Block in using a plurality of adjacent cells simultaneously transmits the data in the same transport block set, these Resource Block in use between on to satisfy the synchronous requirement of OFDM: the time difference of the Resource Block incoming terminal reception antenna on the different antennae is less than the Cyclic Prefix in the OFDM symbol.
Preferably; Sending in the process of business datum to the terminal; (Channel Quality Indication CQI) adjusts its transmitting power on particular resource block respectively to the radio node of sub-district, the radio node of neighbor cell and terminal place according to the channel quality indication of terminal to report.
Preferably, in above-mentioned downlink transmission system, can be independently base station (traditional base station that comprises radio frequency and Base-Band Processing) for radio node, also can be distributed base station remote radio unit (Remote Radio Unit, RRU); And the antenna of radio node can be the antenna that is arranged in different sites, also can be the antenna that is arranged in the covering zones of different (sector) of same site.
For the terminal in this downlink transmission system 202, comprise receive path, transmission channel, baseband processing unit.Wherein, the bandwidth of receive path covers the part or all of working band of sub-district (this sub-district), place, terminal and neighbor cell simultaneously, can receive signal from this sub-district and adjacent sub-district simultaneously; The bandwidth of transmission channel covers the part or all of working band of sub-district, place, terminal and neighbor cell simultaneously.The terminal can be to from the different radio node and have the signals in different frequency bands unification and carry out down-conversion and Base-Band Processing; And, the data that send to said terminal are distinguished from the transmission data of corresponding radio node according to linear superposition theorem.
Demodulate a plurality of transport block set of parallel convey on different spectral the signal that terminal 202 can be sent from the radio node by a plurality of vicinities, and a plurality of transport block set that preferably will demodulate are merged into data flow.In addition, terminal 202 is to network side reporting channel quality indication (CQI) information the time, and both the channel quality indication (CQI) information on the radio node frequency spectrums of operation of sub-district, reporting terminal place also reported the channel quality indication (CQI) information on the neighbor cell radio node frequency spectrums of operation.
Embodiment two
According to the embodiment of the invention, a kind of downlink transmission method of using neighbor cell frequency spectrum resource and channel resource is provided.
As shown in Figure 4, this downlink transmission method can comprise following processing:
Step S402, the definite set that can participate in the preliminary election adjacent cell radio node of single-stream transmission;
Step S404, one or more work radio nodes of single-stream transmission are participated in selection from the set of preliminary election adjacent cell radio node;
Step S406, the business datum that needs is sent to the terminal sends to the single-stream transmission radio node, and this single-stream transmission radio node comprises: the above-mentioned one or more work radio nodes and the radio node of this sub-district;
Step S408, the single-stream transmission radio node sends business datum with the single current mode to the terminal.
Above-mentioned each treatment step below will be described in further detail.
(1) step S402
At first; The detection collection that is made up of one group of adjacent cell distinguished symbol sign is sent in the base station to the terminal; Wherein, survey the signal that collection has been specified specific adjacent cell radio node emission, like the characteristic parameter (like frequency, coded system, measurement window etc.) of pilot signal or synchronizing signal; Terminal to report is to surveying the measurement result of the signal that collects appointment; Network side judges according to the measurement result of terminal to report whether the signal quality of respective cell reaches (comprise and meeting or exceeding) threshold value, and the radio node of sub-district that signal quality is reached threshold value is as the preliminary election adjacent cell radio node of potential participated in single-stream transmission.
Also can discern the adjacent cell radio node of potential participated in single-stream transmission through the Reference Signal Received Power that is used to switch (Reference Symbol Received Power abbreviates RSRP as) of measuring this sub-district and adjacent sub-district.
(2) step S404
For the corresponding adjacent cell of preliminary election adjacent cell radio node, (Overload Indication OI) judges whether to exist resources left according to its overload indication information; There is not resources left in indication for OI, that is, the adjacent cell that has transshipped is abandoned its frequency is used; And, obtain its resource residual amount respectively for each adjacent cell that has resources left, and obtain the application resource borrowing amount of its adjacent cell to it, these data can obtain through the X2 interface between base station and base station; Use the adjacent cell that surplus yield after the resource still reaches threshold value for removing application, with its radio node as the work radio node.
The resource borrowing of the adjacent minizone that has under its command for same distributed base station; Because baseband processing unit (Base Band Unit; BBU) loading condition to each sub-district has real time record; Resource borrowing to adjacent minizone also has comprehensive grasp, therefore need not just can implement confirming above-mentioned working node through the X2 interface between the base station.
(3) step S406
The operation that business datum is sent to the single-stream transmission radio node can be specially following operation: the interior data of the same transport block set of resource block assignments that are respectively the single-stream transmission radio node.
Preferably; Network side is according to each radio node of participating in transmitting--can be called the single-stream transmission radio node resources left ratio of (comprising this sub-district radio node and above-mentioned one or more work radio nodes); Confirm what of transmission rate that each radio node carries or the transmission of bearing, the business datum that sends needs at the terminal sends to each single-stream transmission radio node (or base station).
(4) step S408
Network or BBU sequential delivery mail to the transmission block of same wireless terminal.The concrete grammar that transmits the data in the transport block set is: the process orthogonal transform (for example; Inverse fourier transform; IFFT) data in the transport block set are assigned to one or more with the digital baseband form of I/Q two-way and are confirmed as on the Resource Block on the single-stream transmission radio node.
Network or BBU control the transmitting power that is used for the frequency spectrum that single current transmits, ARQ mode etc. of each radio node according to channel quality (CQI) information.
According to the linear superposition theorem shown in the following formula, wireless terminal is to from the different radio node and have the signals in different frequency bands unification and carry out down-conversion and Base-Band Processing.And, from the transmission data of corresponding radio node, distinguish the data that send to the terminal according to the linear superposition theorem shown in the following formula.
a
1f
1(t)+a
2f
2(t)＝＞A
1F
1(ω)+A
2F
2(ω)
Below further instantiation is described the present invention.
Instance: the descending single current business data transmission of using adjacent cell spectrum between the distributed base station internal node
Fig. 5 is the wireless access network that a distributed base station is formed; In this wireless access network; Be furnished with three RRU on each site as radio node 201; Each RRU covers different sub-district (sector) respectively, and each RRU uses different frequency bands or the different orthogonal sub carrier group in the same frequency band: RRU1 service band f1, coverage cell 1; RRU2 service band f2, coverage cell 2; RRU3 service band f3, coverage cell 3.
Totally nine RRU on three above-mentioned sites of a BBU control and treatment, between each RRU with the mode networking of 1/3 channeling.In such distributed base station region covered; There are wireless terminal UE1 202a and UE2 202b; Wherein, UE1 is covered by three RRU: RRU1 501a, RRU2 501b, RRU3 501c, RRU1 501a are the Control Node of wireless terminal 202a, and RRU1501a implements the needed control command of single-stream transmission through transmitting between control channel between itself and the wireless terminal and the wireless terminal.
BBU502 realizes the single current downlink transfer between network and wireless terminal through the downlink transmission method that provides in the above-described embodiments:
At first; Reference Signal Received Power (the Reference symbol receivedpower that BBU502 reports according to wireless terminal 202a to the RRU around it; RSRP) measuring amount; Determine RRU2501b, RRU3501c and be the potential node of participating in single-stream transmission (that is, above-mentioned preliminary election neighbor cell radio node);
Then, (like this cell load of, OI indication is not 0 to BBU502 according to there not being the such fact in the terminal of using resource in RRU2 501b, the RRU3 501c cell covered; Implementing between the distributed base station internal zone under the situation of single current; BBU has the loading condition of its each RRU that has under its command; Need not to obtain the loading condition of its each RRU that has under its command through the external interface of BBU), further confirm as RRU2 501b, RRU3 501c to the terminal and carry out single current transmission working node;
Secondly, the speed that BBU502 possibly carry according to RRU2 501b, RRU3 501c, and the effect of consideration of power governing factor are confirmed the transmission rate of distributing between RRU2 501a, RRU2 501b, the RRU3 501c;
At last; BBU502 uses RRU2 501a, RRU2 501b, RRU3 501c (promptly; Above-mentioned single-stream transmission working node) transmission channel and frequency spectrum, perhaps the data of Resource Block in wireless terminal transmits same transport block set on RRU2 501a, RRU2 501b, the RRU3 501c are used in timesharing simultaneously.
The single current indication information that wireless terminal issues according to Control Node RRU2 501a, the resource block location on each radio node, the transformat indication information of transport block set etc. are to from the data demodulates that belongs to same transport block set, decoding on one or more radio node.
By means of technique scheme of the present invention; Data are launched at emission system (transmission channel) terminal to this sub-district on the frequency spectrum of this adjacent sub-district of using through using adjacent sub-district; Can overcome the frequency spectrum that exists in the correlation technique and use a plurality of these problems of sub-district restriction that receive; In addition, dynamically adjust the common region covered in adjacent sub-district through combining the power control measure, can be under the controlled prerequisite of the constant and adjacent area interference of holding frequency spatial reuse general layout; Improve the terminal and accept the zone of many subdistrict frequency bands common service, thereby improve the transmission rate at the terminal that is positioned at cell edge.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. downlink transmission system of using adjacent cell spectrum resource and channel resource; Comprise a plurality of adjacent or contiguous radio node and at least one terminal; Said a plurality of radio node uses the distinct transmit frequency band to provide professional to the terminal of its service area according to the requirement of channeling; And there is overlapping in the institute's region covered that transmits of adjacent radio node, it is characterized in that:
The radio node of sub-district, place, terminal uses the part or all of Resource Block in its transmission channel, the emission band; And the radio node of place, said terminal adjacent cells of cells uses transmission channel separately, the part or all of Resource Block in the emission band, sends business datum with the single current mode to said terminal jointly.
2. downlink transmission system according to claim 1; It is characterized in that; Said single current mode is meant; Sending in the process of business datum to said terminal, all carrying the data that belong to same transport block set on the Resource Block of the radio node of the Resource Block of the radio node of said adjacent sub-district and sub-district, place, said terminal.
3. downlink transmission system according to claim 1; It is characterized in that all or part of Resource Block of all or part of Resource Block of the radio node of system's while or the said adjacent sub-district of use, timesharing ground and the radio node of sub-district, place, said terminal sends said business datum.
4. downlink transmission system according to claim 1; It is characterized in that; Sending in the process of business datum to said terminal, the radio node of the radio node of said neighbor cell and sub-district, place, said terminal is adjusted its transmitting power on particular resource block respectively according to the channel quality indication of said terminal to report.
5. according to each described downlink transmission system in the claim 1 to 4, it is characterized in that said radio node comprises: the remote radio unit of base station, distributed base station independently; The antenna of said radio node comprises: be arranged in different sites antenna, be arranged in the antenna of the covering zones of different of same site.
6. according to each described downlink transmission system in the claim 1 to 4, it is characterized in that:
Said terminal is to from the different radio node and have the signals in different frequency bands unification and carry out down-conversion and Base-Band Processing; And, the data that send to said terminal are distinguished from the transmission data of corresponding radio node according to linear superposition theorem;
Said terminal comprises channel quality indication (CQI) information and the channel quality indication (CQI) information on the neighbor cell radio node frequency spectrums of operation on the radio node frequency spectrums of operation of sub-district, terminal place to the channel quality indication (CQI) information that network side reports.
7. according to each described downlink transmission system in the claim 1 to 4, it is characterized in that: said terminal is meant the terminal that is positioned at cell edge region.
8. according to each described downlink transmission system in the claim 1 to 4, it is characterized in that:
Said Resource Block be following any: the interval frequency spectrum of a corresponding special time; The interval sub carrier group of a corresponding special time in the orthogonal frequency division multiplexed.
9. a downlink transmission method of using adjacent cell spectrum resource and channel resource is characterized in that, comprising:
The definite set that can participate in the preliminary election adjacent cell radio node of single-stream transmission;
From the set of said preliminary election adjacent cell radio node, select to participate in one or more work radio nodes of single-stream transmission;
The business datum that needs is sent to the terminal sends to the single-stream transmission radio node, and wherein, said single-stream transmission radio node comprises: said one or more work radio nodes, the radio node of sub-district, place, terminal;
Said single-stream transmission radio node uses the distinct transmit frequency band according to the requirement of channeling, sends said business datum with the single current mode to said terminal.
10. downlink transmission method according to claim 9 is characterized in that, the operation of said definite said preliminary election adjacent cell radio node collection is specially:
The detection collection that is made up of one group of adjacent cell distinguished symbol sign is sent to said terminal in the base station, and wherein, said detection collection has been specified the signal of specific adjacent cell radio node emission;
Said terminal to report is to the measurement result of the signal of said detection collection appointment;
Network side judges according to the said measurement result of said terminal to report whether the signal quality of respective cell reaches threshold value, and the radio node of sub-district that will reach threshold value is as participating in the preliminary election adjacent cell radio node of single-stream transmission.
11., it is characterized in that the operation of the said one or more work radio nodes of said selection is specially according to claim 9 or 10 described downlink transmission methods:
For the corresponding adjacent cell of said preliminary election adjacent cell radio node, judge whether to exist resources left according to its overload indication information;
Each adjacent cell for there being resources left obtains resource residual amount respectively, and obtains the application resource borrowing amount of its adjacent cell to it;
For removing the adjacent cell that the surplus yield of using after the resource still reaches threshold value, with its radio node as said work radio node.
12. downlink transmission method according to claim 9 is characterized in that, the operation that said business datum is sent to said single-stream transmission radio node comprises:
The digital baseband form of data in the transport block set with the I/Q two-way is assigned on the Resource Block of said single-stream transmission radio node.
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| PCT/CN2007/003346 WO2009067842A1 (en) | 2007-11-27 | 2007-11-27 | Downlink transmission system and method for borrowing spectrum resources and channel resources from adjacent cells |
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| JP2011505088A (en) | 2011-02-17 |
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