CN101690291A - 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 thecell 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 orall 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 togetherwhich 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
Borrow adjacent cell frequency spectrum resource and channel resource
Downlink transmission system and the present invention relates to the communications field in method and technology field, specifically, it is related to the downlink transmission system and method for borrowing neighbor cell frequency spectrum resource and channel resource, the terminal transmission data of above-mentioned downlink transmission system and method for the emission system using neighbor cell on the frequency spectrum of the neighbor cell of borrow to this cell.Background technology inter-cell interference, the key problem of tune (Inter-cell Interference Coordination, referred to as ICIC) are the uses in multiple inter-cell coordination Radio Resources, it is accordingly required in particular to pay close attention to cell edge（ "the cell border requires special attention" ).ICIC carries out doing tune in multiple minizones to space, time and frequency channels resource and power, so that the dry shield between Jiang Shi neighbor cells.The dry ^ coordination techniques of time-frequency domain, which can be divided into static, semi-static and dynamical fashion time-frequency domain resources, to be coordinated.Static mode leads to the planning of ± minizone and determined mainly when carrying out plot planning.The coordination of resource can modify according to the change of inter-cell load and business characteristic, but the time cycle that this-* * kind changes is general longer.For semi-static mode, the cycle of resource allocation is higher than static mode.For dynamic coordination mode, resource allocation is implemented with frequent.The gain highest that dynamical fashion can be obtained, however, it is desirable to measurement and information reporting expense it is very big, and need frequently carry out real-time Communication for Power in multiple minizones.A kind of basic scheme for solving inter-cell interference is " soft-frequency reuse " or " partial frequency multiplexing ".The technology is by OFDM (Orthogonal Frequency Division Multiple, OFDM) all subcarriers of system are divided into m Group, different neighbor cell selects different groups of subcarrier as the Main subcarriers of this cell, other subcarriers as this cell auxiliary son carrier waves, Main subcarriers to each cell transmission power thresholding different with auxiliary son carrier waves setting again, and the transmission power thresholding of Main subcarriers is higher than the transmission power thresholding of auxiliary son carrier waves, and cell boarder is determined with the coverage of Main subcarriers.What is distributed from cell centre to cell edge is Main subcarriers, and it can cover the scope of whole cell；White space distribution is auxiliary son carrier waves, the inside of its coverage cell.So, for Intra-cell, the main auxiliary son carrier waves transmission data using lower-wattage, due to closer from base station, therefore terminal can receive this cell clearly signal, and because auxiliary son carrier waves power is smaller, therefore the interference between adjacent small areas is also smaller；And in each neighbor cell fringe region using high power main carrier transmission data, in fringe region
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Terminal primary recipient to be different neighbor cells Main subcarriers, due to different neighbor cells Main subcarriers non-overlapping and to be orthogonal, therefore interfere and will substantially reduce." soft-frequency reuse " or " partial frequency multiplexing " related patented technology has the CN200510068133 Chinese patent applications of entitled " method that logical t coordinates inter-cell interference to the power programming of OFDM mobile communication system ", the CN200610087983 Chinese patent applications of entitled " method of uplink interference coordination, base station, terminal and network in SFN ".This method is being discussed in the long evolving system standard of current 3G (Third Generation) Moblie.The defect of this technology is the frequency resource of cell edge by the blunt systems of P, it is difficult to support a large number of users and very high data rate.In order to which Slow solves the problem of frequency resource of cell edge that " soft-frequency reuse " be present is restricted ,-individual basic thinking is to improve the frequency reuse of cell edge, that is, breaks the fixation of fringe region and take coefficient, such as 1/3 limitation.Technology motion：3GPP Rl-051059 (Inter-cell interference mitigation for EUTRA Texas Instruments, 3 GPP RAN WG1 #42bis, San Diego, California, US, October 2005) thinking providing is exactly：When the light load of adjacent cell, borrow the frequency of adjacent cell to improve the transmission rate of the edge termination of this cell, Fig. 1 shows the schematic diagram of this method.In R1-051059 schemes, Intra-cell is can to subtract power using whole frequency ranges, but cell edge is no longer fixed 1/3, but is adjusted according to the difference of edge load between adjacent cell.When some Cell Edge User is less, its usable frequency will be less than 1/3, meanwhile, when its neighbouring cell edge load is heavier, the edge usable frequency of adjacent cell will be more than 1/3.If all Cell Edge User loads are all heavier, the usable frequency of each cell edge is all 1/3.Reference picture 1, the method for frequency soft multiplexing is as follows used in the minizone edge that R1-051059 schemes are provided：Assuming that first moment, the edge load of cell 1 is heavier, and the edge load of its 2,4,6 neighbouring cell is all lighter, 3rd, the edge load of 5,7 cells is general, now, 3,5,7 cell edges still take 1/3 frequency range, and 2,4,6 cells then save next part frequency and used to the edge customer of cell 1, now, the edge customer of cell 1 takes frequency range more than 1/3.Assuming that having arrived the m-th moment, the edge load of cell 1 is general, and the edge load of its 2,4,6 neighbouring cell is heavier, and the 3rd, the edge load of 5,7 cells is all lighter, it is then just blunt according to the program, 1/3 original available frequency band of the 1st cell edge distribution, and 3,5,7 cells then save next part frequency and used to 2,4,6 Cell Edge User, now, 2,4,6 Cell Edge User usable frequencies exceed 1/3 original usable frequency.The above-mentioned emission system using this cell is on the adjacent cell frequency spectrum of borrow into the method for the terminal transmission data of this cell, and the precondition for borrowing frequency used in its edge from other cells is：Must be that neighbouring all cell edge all light loads for using the frequency could be borrowed.Such as in Fig. 1, the m-th moment, even if the edge load of cell 3,5 is all extremely light, and the edge customer of cell 7 is more, now
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Frequency cannot be borrowed from 3,5,7 cells.Fig. 1 illustrate only the situation of 7 adjacent cell structures, be also the problem of having same for the networking model that frequency reuse is 1/3.When working frequency is borrows frequency spectrum between fl, G, β three neighbor cells, when such as working frequency will borrow f2 for fl cell, it is required for very light load just to borrow for two adjacent f2 cells of fl cell with working frequency, in other words, when to working frequency for the edge termination frequency of use ￡ 2 of fl cell part or all of resource block when, working frequency may all be interfered for fl two neighbor cells of cell.The content of the invention is considered to be borrowed to the terminal transmission data time-frequency spectrum of this cell on the frequency Zan of the adjacent cell of borrow using the emission system of this cell present in correlation technique and restricted by multiple cells, and the neighbor cell of this cell is the problem of may be interfered and proposes the present invention, therefore, the present invention is intended to provide a kind of emission system of use adjacent cell on terminal transmission data from the frequency spectrum of the adjacent cell of borrow to this cell technology.
According to an aspect of the present invention, there is provided a kind of downlink transmission system for borrowing adjacent cell frequency spectrum resource and channel resource.The downlink transmission system includes multiple adjacent or neighbouring radio node and at least one terminal, the multiple radio node using identical or different emission band provides business according to the requirement of channeling to the terminal of its service area, and adjacent wireless node the region that is covered of transmission signal exist it is overlapping.Wherein, the radio node of cell uses the part or all of resource block in its transmission channel, its emission band where terminal, and the radio node of the adjacent cell of cell where terminal sends business datum with terminal described in single current mode ^ jointly using the part or all of resource block in respective transmission channel and emission band.Wherein, single current mode refers to, system to terminal during business datum is sent, and carrying belongs to the data of same transport block set on the resource block of the radio node of cell where the resource block and terminal of the radio node of the adjacent cell of cell where wireless terminal.Preferably, system to terminal during business datum is sent, and the channel quality Zhi Shi Fen Do that the radio node of cell where the radio node and terminal of neighbor cell is reported according to terminal adjust its transmission power in particular resource block.Also, system can simultaneously or timesharing send business datum using the whole of radio node or all or part of resource block of radio node of cell where resource block and terminal of neighbor cell.Preferably, above-mentioned radio node includes：Independent base station, the remote radio unit of distributed base station；The antenna of radio node includes：It is arranged in the antenna of different sites, is arranged in covering for same site
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The antenna of lid different zones.Preferably, signal of the above-mentioned terminal-pair from different radio node and with different frequency bands is unified carries out down coversion and Base-Band Processing；And according to linear superposition theorem, the data for being sent to terminal are distinguished from the transmission data of corresponding radio node；And the channel quality indication (CQI) information on the channel quality indication (CQI) information and neighbor cell radio node work frequency that cell radio node work frequency where the channel quality indication (CQI) information that terminal is reported to network side includes terminal is spoken.Above-mentioned terminal refers to the terminal positioned at cell edge region.Above-mentioned resource block is following any：The interval frequency spectrum of one special time of correspondence；The interval subcarrier group of one special time of correspondence in orthogonal frequency division multiplexed.There is provided a kind of borrow neighbor cell frequency spectrum resource and the downlink transmission method of channel resource according to another aspect of the present invention.Just the blunt downlink transmission method according to the present invention includes following processing：It is determined that may participate in the set of the pre-selection adjacent cell radio node of single-stream transmission；Selection participates in one or more work radio nodes of single-stream transmission from the set of pre-selection adjacent cell radio node；The business datum for sending terminal to will be needed to be sent to single-stream transmission radio node, wherein, single-stream transmission radio node includes：The radio node of cell where one or more work radio nodes, terminal；Single-stream transmission radio node sends business datum in single current mode to terminal.Preferably, it is determined that the operation of pre-selection adjacent cell radio node collection is specially：Base station sends the detection collection being made up of one group of adjacent cell distinguished symbol mark to terminal, wherein, detection collection specifies the signal of specific adjacent cell radio node transmitting；Terminal reports the measurement result for the signal specified to detection collection；The measurement result that network side is reported according to terminal judges whether the signal quality of respective cell reaches threshold value, and be up to threshold value cell radio node as the pre-selection adjacent cell radio node that may participate in single-stream transmission.Preferably, the operation of the one or more work radio nodes of above-mentioned selection is specially：Adjacent cell corresponding for pre-selection adjacent cell radio node, resources left is judged whether according to its overload indication information；For there is each adjacent cell of resources left, resource residual amount is obtained respectively, and obtain application resource borrowing amount of its adjacent cell to it；The adjacent cell being not worth still is reached for removing the surplus yield borrowed after resource, its radio node is regard as work radio node.Preferably, the above-mentioned operation that business datum is sent into single-stream transmission radio node includes：Data in one transport block set are assigned to single-stream transmission radio node with the digital baseband form of I/Q two-way
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On resource block.At least one in the above-mentioned technical proposal of the present invention can realize following beneficial effect：By using the emission system of adjacent cell（Transmission channel）To the terminal transmission data of this cell on the frequency language of the adjacent cell of the borrow, frequency spectrum present in correlation technique can be overcome to borrow and restricted this problem by multiple cells, in addition, by dynamically adjusting the region that adjacent cell is collectively covered with reference to Power Control measure, can be on the premise of keep frequency spatial reuse general layout be constant and adjacent cell interference is controlled, improve terminal and receive the region of multiple cell frequency band common service, so as to improve the transmission rate of the terminal positioned at cell edge.Other features and advantages of the present invention will be illustrated in the following description, also, is partly become apparent from specification, or is understood by implementing the present invention.The purpose of the present invention and other advantages can be realized and obtained by specifically noted structure in the specification, claims and accompanying drawing write.Appended drawings are used for providing a further understanding of the present invention, and constitute a part for specification, together with embodiments of the present invention for explaining the present invention, are not construed as limiting the invention.In the accompanying drawings：Fig. 1 is the schematic diagram of the inter-cell frequency borrowing method according to correlation technique；Fig. 2 is the schematic diagram of downlink transmission system according to embodiments of the present invention；Fig. 3 is the schematic diagram according to embodiments of the present invention that business datum is sent in single current mode；Fig. 4 is>According to the flow chart of the downlink transmission method of the embodiment of the present invention；Fig. 5 is the schematic diagram for the downlink traffic transmission example that adjacent cell frequency spectrum is borrowed between distributed base station internal node according to embodiments of the present invention.Embodiment is as described above, in view of using the emission system of this cell there is the problem of restricting in terms of frequency language borrow when the terminal transmission data of this cell on the frequency spectrum of the adjacent cell of borrow present in correlation technique, The present invention gives a kind of emission system of use adjacent cell（Transmission channel）On terminal transmission data from the adjacent cell Pin Wrong of borrow to this cell scheme, in other words, in the technical scheme that provides of the present invention, this cell not only borrows the frequency spectrum resource of adjacent cell, also borrows the transmission channel of adjacent cell.
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Wherein Pin Soy resource borrowings mode can have a variety of, such as, between wireless terminal and the wireless terminal of neighbor cell, the cell edge frequency spectrum resource for being belonging respectively to different districts is shared by way of using united frequency hopping in the common band that different districts edge spectrum resource is covered at one.Another sunset is foretold, and the terminal mentioned in the present invention is primarily referred to as the terminal positioned at cell edge, but not limited to this, and the resource block mentioned in the present invention can be but not limited to it is following any：1) frequency spectrum in one special time interval of correspondence；2) the subcarrier group in orthogonal frequency division multiplexed in one special time interval of correspondence.The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that preferred embodiment described herein is merely to illustrate and explain the present invention, and is not intended to limit the present invention.Embodiment one according to embodiments of the present invention, provide firstly a kind of downlink transmission system for borrowing adjacent cell frequency spectrum resource and channel resource.The downlink transmission system can also be referred to as descending single-current transmission system vividerly, and Fig. 2 gives the schematic diagram of borrow adjacent cell frequency spectrum resource according to embodiments of the present invention and channel resource downlink transmission system.As shown in Fig. 2 the downlink transmission system includes multiple adjacent or neighbouring radio node（Seven radio node 201a ~ 201g are shown in Fig. 2) and at least one terminal（A terminal positioned at cell where radio node 201a is shown in Fig. 2（User Equipment, UE) 202, wherein, multiple neighbouring radio nodes using identical or different emission band provide business according to the requirement of channelings to the terminal of its service area, and adjacent wireless node the region that is covered of transmission signal exist it is overlapping.Wherein, 203 represent terminals Traffic Channel, its by serving cell resource block（SRB) and borrow other cells resource block（BRBl ~ BRBn) composition.Multiple neighbouring radio nodes provide business to the terminal of its service area using identical or different emission band according to the requirement of channeling and referred to：1) terminal of the inside of the cell covered for radio node, radio node between the cell adjacent thereto of multiplexing factor 1 to realize channeling, in this case, each radio node can use the terminal service that identical frequency spectrum is its Intra-cell；2) it is neighbouring but interference will be produced between belonging to the wireless terminal of different districts fringe region in geographical position soil in the marginal zone i or interior of radio node overlay area, it is a kind of avoid this interference method be：Each cell uses different frequency spectrums in its fringe region.Although this method can avoid the interference between the edge termination of adjacent cell, an available spectral bandwidth for the terminal in fringe region of each cell is substantially reduced.The present invention solve this problem basic skills be：The available bandwidth of edge termination, each Subnormal subgroup that shared bandwidth can both have been used in cell edge region are improved by sharing frequency spectrum and transmission channel between adjacent cell（Mutually
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Reprimand）Frequency band between carry out, can also be carried out in whole system available band, depending on this is according to the actual loading of each cell green grass or young crops condition.Wherein, the radio node of the place cell of terminal 202（For example, the radio node 201a shown in Fig. 2) use the radio node of the adjacent cell of cell where the part or all of resource block in its transmission channel, its emission band, and several terminals（For example, radio node 201b, 201g, 201f shown in Fig. 2) use the part or all of resource block in respective transmission channel and emission band（Resource Block, referred to as RB), business datum is sent to terminal in single current mode jointly.System can simultaneously or timesharing send business datum using the whole of radio node or all or part of resource block of radio node of cell where resource block and terminal of neighbor cell.A kind of system come the example for sending business datum is using the whole of radio node or all or part of resource block of radio node of cell where resource block and terminal of neighbor cell in the way of timesharing：Wireless terminal receives data in the way of frequency hopping from neighbouring or adjacent radio node.Above-mentioned single current mode refers to：During business datum is sent to terminal 202, the radio node of adjacent cell（For example, radio node 201b, 201g, 201f shown in Fig. 2) resource block and terminal where cell radio node（For example, the radio node 201a shown in Fig. 2) resource block on carrying belong to the data of same transport block set.Specifically, by different radio node to before Radioterminal Transmit data, first these data are carried out with unified orthogonal transformation, such as fast fourier inverse transformation, transmission on the different frequency bands of the data distribution in the same transport block set of formation to different radio nodes.Specifically, Fig. 3 shows the schematic diagram that business datum is sent in single current mode.As shown in figure 3, serving cell（Or be this cell, for example, cell where radio node 201a）Resource block SBR collection close part resource block, adjacent cell 1 (for example, radio node 201b where cell）Resource set of blocks in part resource block BRB1, adjacent cell 2 (for example, radio node 201g where cell）Resource set of blocks in part resource block BRB2 adjacent cells n resource set of blocks in part resource block BRBn on carry data in same transport block set.For the flexibility of realization, the resource block of moon business cell can also be used in the way of the time-division（SRB) in the resource set of blocks for the part resource block adjacent cell 1 that collection closes:Part resource block BRB1, adjacent cell
Part resource block BRBn in the resource set of blocks of part resource block BRB2 adjacent cells n in 2 resource set of blocks, transmits the data in same transport block set using the resource block in one or more adjacent cell every time.When transmitting the data in same transport block set using the resource block in multiple adjacent cells simultaneously, these resource blocks when in use between upper to meet the synchronous of OFDM and require：No
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Time difference with the resource block incoming terminal reception antenna on antenna is less than the cyclic prefix in OFDM symbol.Preferably, the during business datum is sent to terminal, the channel quality that the radio node of cell where the radio node and terminal of neighbor cell is reported according to terminal is indicated（Channel Quality Indication, CQI) its transmission power in particular resource block is adjusted respectively.Preferably, can be independent base station for radio node in above-mentioned downlink transmission system（Traditional base station comprising radio frequency and Base-Band Processing can also be the remote radio unit (Remote Radio Unit, RRU) of distributed base station;And the antenna of radio node can be the covering different zones for being arranged in the antenna of different sites or being arranged in same site（Sector）Antenna.For the terminal 202 in the downlink transmission system, including receiving channel, transmission channel, baseband processing unit.Wherein, the bandwidth of receiving channel covers cell where terminal simultaneously（This cell）With the part or all of working band of neighbor cell, signal can be received from this cell and adjacent cell simultaneously；The portion or whole working bands of cell where the bandwidth of transmission channel covers terminal simultaneously and neighbor cell.Terminal unified to the signal from different radio node and with different frequency bands can carry out down coversion and Base-Band Processing；And according to linear superposition theorem, the data for being sent to the terminal are distinguished from the transmission data of corresponding radio node.Terminal 202 can demodulate the multiple transport block sets transmitted parallel on different spectral from the signal sent by multiple neighbouring radio nodes, and the multiple transport block sets preferably demodulated are merged into data flow.In addition, terminal 202 is when to 4 blunt channel quality indication (CQI) information on network side, both the channel quality indication (CQI) information where upper 4 blunt terminals in cell radio node frequency spectrums of operation, also reported the channel quality indication (CQI) information on the radio node work frequency language of neighbor cell.There is provided a kind of borrow neighbor cell frequency spectrum resource and the downlink transmission method of channel resource according to embodiments of the present invention for embodiment two.As shown in figure 4, the downlink transmission method can include handling under ^：Step S402, it is determined that may participate in the set of the pre-selection adjacent cell radio node of single-stream transmission；Step S404, selection participates in one or more work radio nodes of single-stream transmission from the set of pre-selection adjacent cell radio node；
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Step S406, it would be desirable to which the business datum for sending terminal to is sent to single-stream transmission radio node, the single-stream transmission radio node includes：Above-mentioned one or more work radio nodes and the radio node of this cell；Bu Sudden S408, single-stream transmission radio node sends business datum in single current mode to terminal.Above-mentioned Li Bu Sudden at each further detailed below.
(-) step S402 is first, base station sends the detection collection being made up of Yi Group adjacent cells distinguished symbol mark to terminal, wherein, detection collection specifies the signal of specific adjacent cell radio node transmitting, the characteristic parameter of such as pilot signal or synchronizing signal（Such as frequency, coded system, measurement window）；Terminal reports the measurement result for the signal specified to detection collection；Network side is just blunt to judge whether the signal quality of respective cell reaches according to measurement result blunt in terminal（Including meeting or exceeding）Threshold value, and signal quality being reached to, the radio node of the cell of wealthy value is used as the pre-selection adjacent cell radio node that potentially may participate in single-stream transmission.Can also be by measuring the Reference Signal Received Power for being used to switch of this cell and adjacent cell
(Reference Symbol Received Power, referred to as RSRP) potentially may participate in the adjacent cell radio node of single-stream transmission to recognize.
(two）Step S404 judges whether resources left for the corresponding adjacent cell of pre-selection adjacent cell radio node according to its overload indication information (Overload Indication, OI)；Indicate that resources left is not present for OI, i.e. the adjacent cell overloaded, abandon borrowing its frequency；And for there is each adjacent cell of resources left, its resource residual amount is obtained respectively, and application resource borrowing amount of its adjacent cell to it is obtained, these data can be obtained by the X2 interface between base station and base station；The surplus yield borrowed for removing application after resource still reaches the nearly cell of threshold value, regard its radio node as work radio node.Resource borrowing between the adjacent cell being had under its command for same distributed base station, due to baseband processing unit (Base Band Unit, BBU) there is real-time record to the loading condition of each cell, also there is comprehensive grasp the resource borrowing adjacent cell, therefore without being implemented with the determination to above-mentioned working node by the X2 interface between base station.
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(three）The work of pushing violently that business datum is sent to single-stream transmission radio node by Bu Sudden S406 can be specially to operate as follows：The data that respectively resource block of single-stream transmission radio node is distributed in same transport block set.Preferably, network side is according to each radio node for participating in transmission --- it is properly termed as single-stream transmission radio node（Including this ' j, area's radio node and above-mentioned one or more work radio nodes）Resources left ratio, it is determined that the transmission rate of each radio node carrying or the transmission that undertakes number, the business datum for needing to send to terminal is sent to each single-stream transmission radio node（Or base station）.
(4) step S408 networks or BBU sequential deliveries are sent to the transmission block of same wireless terminal.Transmitting the specific method of the data in a transport block set is：Passing through orthogonal transformation（For example, inverse fourier transform, IFFT) a transport block set in data, be assigned to the digital baseband form of I/Q two-way on the resource block that one or more is confirmed as on single-stream transmission radio node.Network or BBU are just blunt according to channel quality（CQI) the transmission power, the ARQ modes that are used for single streamed frequency spectrum of information to control each radio node etc..Linear superposition theorem according to following formula, wireless terminal is unified to the signal from different radio node and with different frequency bands to carry out down coversion and Base-Band Processing.And according to the linear superposition theorem shown in following formula, the data for being sent to terminal are distinguished from the transmission data of corresponding radio node. ax (0 + ¾ 2 (0 => A,FX (ώ) + A2F2Further instantiation is described the present invention by (ω) below.Example：Descending single current business data transmission Fig. 5 that adjacent cell frequency spectrum is borrowed between distributed base station internal node is the wireless access network of a distributed base station composition, in the wireless access network, three RRU as radio node 201 are disposed with each site, each RRU is covered each by different cell (sectors）, and each RRU uses the different orthogonal subcarrier group in different frequency bands or same frequency band：RRU1 service band fl, coverage cell 1;RRU2 service bands ￡ 2, coverage cell 2;RRU3 service band β, coverage cell 3.Between totally nine RRU on one BBU control process, three above-mentioned sites, each RRU with
The mode networking of 1/3 channeling.In the region that such a distributed base station is covered, exist wireless
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202a the and UE2 202b of terminal UE 1, wherein, UE1 is covered by three RRU：R U1 501a, RRU2 501b, RRU3 501c, RRU1 501a are wireless terminal 202a control nodes, and RRU1 501a implement the control instruction required for single-stream transmission by transmission between its control channel and wireless terminal between wireless terminal.BBU502 realizes the single current downlink transfer between network and wireless terminal by the downlink transmission method provided in the above-described embodiments：First, the reference signal to the RRU around it that BBU502 is reported according to wireless terminal 202a connects》| t power（Reference symbol received power, RSRP) measurement amount, determine RRU2 501b. RRU3 501c be participate in single-stream transmission potential node（That is, above-mentioned pre-selection neighbor cell radio node）；Then, BBU502 occupies such a fact of terminal being not present in RRU2 501b, the cell of RRU3 501c coverings using resource（Such as, OI indicates that the cell load is 0;In the case of implementing single current between distributed base station internal zone, BBU has its each RRU having under its command loading condition, and its each RRU having under its command loading condition is obtained without the external interface by BBU）, further RRU2 501b, RRU3 501c are defined as sending working node to terminal progress patrilineal line of descent with only one son in each generation；Secondly, the BBU502 just blunt speed that may be carried according to RRU2 501b, RRU3 501c, and consider the effect of Power Control factor, determines the transmission rate distributed between R U2 501a, RRU2 501b, RRU3 501c；Finally, BBU502 uses RRU2 501a, R U2 501b, RRU3 501c (that is, above-mentioned single-stream transmission working nodes）Transmission channel and frequency spectrum, while or timesharing use RRU2 501a, RRU2 501b, the resource block on RRU3 501c transmits the data in same transport block set to wireless terminal》Single current configured information, the resource block location on each radio node, transformat configured information of transport block set that wireless terminal is issued according to control node RRU2 501a etc., to the data for belonging to same transport block set demodulation, the decoding on one or more radio node.By means of the above-mentioned technical proposal of the present invention, by using the emission system of adjacent cell（Transmission channel）In the frequency of the adjacent cell of the borrow " to the terminal transmission data of this cell on general; frequency language can be overcome present in correlation technique to borrow and restricted this problem by multiple cells; in addition; by dynamically adjusting the region that adjacent cell is collectively covered with reference to Power Control measure; can and adjacent cell constant in keep frequency spatial reuse general layout interference it is controlled on the premise of; improve terminal and receive the region of multiple cell frequency band common service, so as to improve
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Positioned at the transmission rate of the terminal of cell edge.The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.
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Claims (1)
- Claims1. a kind of downlink transmission system for borrowing adjacent cell frequency spectrum resource and channel resource, including multiple adjacent or neighbouring radio node and at least one terminal, the multiple radio node uses identical or different emission band to provide business to the terminal of its service area according to the requirement of channeling, and the region that the transmission signal of adjacent wireless node is covered is in the presence of overlapping, it is characterised in that：The radio node of cell uses the part or all of resource block in its transmission channel, emission band where terminal, and the radio node of the adjacent cell of cell uses the part or all of resource block in respective transmission channel, emission band where the terminal,, business datum is sent to the terminal in single current mode jointly.2. the blunt descending single-stream transmission system ^ according to described in claim 1 of, it is characterized in that, the single current mode refers to, during business datum is sent to the terminal, carrying belongs to the data of same transport block set on the resource block of the radio node of cell where the resource block of the radio node of the adjacent cell and the terminal.3. descending single-current transmission system according to claim 1, characterized in that, system simultaneously or timesharing send the business datum using the whole of radio node or all or part of resource block of radio node of cell where resource block and the terminal of the adjacent cell.4. occupy the downlink transmission system described in claim 1, it is characterized in that, during business datum is sent to the terminal, the channel quality that the radio node of cell where the radio node of the neighbor cell and the terminal is reported according to the terminal indicates to adjust its transmission power in particular resource block respectively.5. downlink transmission system according to any one of claim 1 to 4, it is characterised in that the radio node includes：Independent base station, the remote radio unit of distributed base station；The antenna of the radio node includes：Be arranged in the day of different sites, be arranged in same site covering different zones antenna.6. lower beam Transmission system according to any one of claim 1 to 4, it is characterised in that：Letter of the terminal-pair from different radio node and with different frequency bands is unified to carry out down coversion and Base-Band Processing；And according to linear superposition theorem, the data for being sent to the terminal are distinguished from the transmission data of corresponding radio node;13 P16728 The channel quality indication (CQI) information that the channel quality indication (CQI) information and neighbor cell radio node that cell radio node where the channel quality indication (CQI) information that the terminal is reported to network side includes terminal works on frequency Pass work on frequency language.Downlink transmission system according to any one of claim 1 to 4, it is characterised in that：The terminal refers to the terminal positioned at cell edge region.Downlink transmission system according to any one of claim 1 to 4, it is characterised in that：The resource block is following any：The interval frequency of one special time of correspondence-latent；The interval subcarrier group of one special time of correspondence in orthogonal frequency division multiplexed.A kind of downlink transmission method for borrowing adjacent cell frequency resource and channel resource, it is characterised in that including：It is determined that may participate in the set of the pre-selection adjacent cell radio node of single-stream transmission；Selection participates in one or more work radio nodes of single-stream transmission from the set of pre-selection adjacent cell radio node；The business datum for sending terminal to will be needed to be sent to single-stream transmission radio node, wherein, the single-stream transmission radio node includes：The radio node of cell where one or more of work radio nodes, terminal；The single-stream transmission radio node sends the business datum in single current mode to the terminal.Downlink transmission method according to claim 9, it is characterised in that the operation of the determination pre-selection adjacent cell radio node collection is specially：Base station sends the detection collection being made up of one group of adjacent cell distinguished symbol mark to the terminal, wherein, the detection collection specifies the signal of specific adjacent cell radio node transmitting；The terminal reports the measurement result for the signal specified to the detection collection；The measurement result that network side is reported according to the terminal judges whether the signal quality of respective cell reaches threshold value, and be up to threshold value cell radio node as the pre-selection adjacent cell radio node that may participate in single-stream transmission.14 P1672811. the downlink transmission method according to claim 9 or 10, it is characterised in that the operation of the one or more of work radio nodes of selection is specially：Adjacent cell corresponding for pre-selection adjacent cell radio node, it is just blunt to judge whether resources left according to its overload indication information；For there is each adjacent cell of resources left, resource residual amount is obtained respectively, and obtain application resource borrowing amount of its adjacent cell to it；The adjacent cell of threshold value is still reached for removing the surplus yield borrowed after resource, its radio node is regard as the work radio node.12. downlink transmission method according to claim 9, it is characterised in that the operation that the business datum is sent into the single-stream transmission radio node includes：On the resource block that data in one transport block set are assigned to the single-stream transmission radio node with the digital baseband form of two-way.15 P16728
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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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| CN104272785A (en) * | 2014-02-25 | 2015-01-07 | 华为技术有限公司 | Spectrum processing method, base station, user equipment and system |
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| WO2009067842A1 (en) | 2009-06-04 |
| CN101690291B (en) | 2012-11-14 |
| JP2011505088A (en) | 2011-02-17 |
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