CN101635979B - Method for inhibiting inter-cell uplink interference in time division duplex system - Google Patents
Method for inhibiting inter-cell uplink interference in time division duplex system Download PDFInfo
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- CN101635979B CN101635979B CN 200810135087 CN200810135087A CN101635979B CN 101635979 B CN101635979 B CN 101635979B CN 200810135087 CN200810135087 CN 200810135087 CN 200810135087 A CN200810135087 A CN 200810135087A CN 101635979 B CN101635979 B CN 101635979B
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Abstract
The invention provides a method for inhibiting inter-cell uplink interference in a time division duplex system, which comprises the following steps that: according to large-scale fading parameters from a terminal to a group of wireless nodes, a network side selects out the wireless nodes communicating with the terminal from the group of the wireless nodes; according to small-scale fading parameters between the terminal and the group of the wireless nodes and the capability of the terminal, the network side selects a working mode for the terminal and allocates resources on the selected wireless nodes for the terminal; and the terminal uses the working mode transmitted by the network side, and uses the allocated resource to send data to the selected wireless nodes. The method can ensure that the multi-stream parallel transmission is performed between the terminal and the preferred one or a group of wireless access points, and effectively inhibits the transmission from generating uplink interference to other wireless access points or adjacent cells at the same time.
Description
Technical field
The present invention relates to the communications field, suppress the method for inter-cell uplink interference in a kind of tdd systems.
Background technology
In cell mobile communication systems, when uplink was carried out in terminal and base station, the signal of terminal emission can produce the receive path of contiguous base station and disturb, and this interference can cause the reduction of throughput of system.In order to reduce the transmitting to the interference of adjacent cell base station of terminal, produced the Inter-Cell Interference Coordination technology.
At the HSUPA of 3G system (High-Speed Uplink Packet Access, high speed uplink packet accesses) and HSDPA (High-Speed Downlink Packet Access, the high speed downlink packet access) in design, in order to suppress terminal to the uplink interference of adjacent cell, prior art provides following solution: TDD (Time Division Duplexing, time division duplex) in ascending reinforcement system, utilize channel reciprocity and distributed scheduling to realize control in advance to the presence of intercell interference degree.This control mode does not need terminal to receive control signal from adjacent non-service cell, and adapts with the existing TDD structure of 3GPP (CDMA).
Fig. 1 shows the concrete grammar schematic diagram that this motion provides, and wherein, the scheduling unit in base station processor 101,111,121 carries out uplink scheduling to the terminal of this residential quarter, and antenna for base station 102,103,104 is overlay area 102a, 103a, 104a respectively.106 pairs of Serving cells of terminal and transmitting of adjacent cell are measured, and read the reference power of measuring-signal from CBCH.Each terminal is introduced the parameter of an expression path loss: i terminal is expressed as L to the path loss of j cell base station
ij, the path loss of i terminal and Serving cell is expressed as L
iJ, i terminal is expressed as λ divided by this terminal to the ratio that the path loss of its Serving cell obtains to the path loss of j non-service cell
ij, λ
ij=L
ij/ L
iJ, can find out, when terminal moves from the center of housing estate to the cell edge, λ
ijCan become more and more less.
If grasped terminal in Serving cell and λ between each main phase adjacent cell
ij, the annoyance level that can Accurate Prediction at every turn will produce each main phase adjacent cell to the terminal distribution resource of the scheduler in each base station, and then can realize that system-wide interference controls.
The scheduler that prior art provides obtains λ
ijMethod be: terminal is by measuring to calculate L to transmitting of Serving cell and adjacent cell
ijAnd L
iJ, then with feedback information Φ
iForm with the λ of each terminal
ijReport the scheduler of Serving cell by up channel.The highest frequency that reports is that each TTI interval reports Φ one time
i
In realizing process of the present invention, the inventor finds that above-mentioned method only is only applicable to the situation of single antenna, and when terminal and/or base station had a plurality of antenna, above-mentioned method can't be obtained the λ for every pair of transceiver channel
ij, and then can not correspondingly suppress adjacent cell and disturb.
Summary of the invention
The present invention aims to provide a kind of method that suppresses inter-cell uplink interference in tdd systems, only is only applicable to the problem of single antenna to solve above-mentioned method.
In an embodiment of the present invention, a kind of method that suppresses inter-cell uplink interference in tdd systems is provided, comprise the following steps: network side is selected the radio node that communicates with terminal according to the large scale fading parameter of terminal to one group of radio node from this group radio node; Network side is that terminal is selected mode of operation according to the ability of the multipath fading parameter between terminal and this group radio node and terminal, and is the resource on the selected radio node of terminal distribution; The mode of operation that terminal uses network side to issue utilizes the resource of distributing to send data to selected radio node.
Preferably, selecting the radio node that communicates with terminal from one group of radio node specifically comprises: one group of radio node is synchronously measured the channel detection signal power of terminal emission, and calculates terminal to the multipath fading parameter of each radio node according to the transmitting power of terminal; For each radio node, its small scale channel fading parameters is averaged to obtain the large scale channel fading parameters of this radio node; Select a minimum value from the large scale channel fading parameters of one group of radio node, the radio node that it is corresponding is as basic access point; The large scale channel fading parameters of other value in the large scale channel fading parameters of one group of radio node with basic access point compared, with difference wherein less than the corresponding radio node of large scale channel fading parameters of default thresholding as the additional access point that communicates with terminal; With basic access point and additional access point jointly as selected radio node.
Preferably, the small scale channel fading parameters is averaged to obtain the large scale channel fading parameters to be averaged specifically and comprises: a plurality of multipath fading parameters that obtain of repeatedly measuring of one or more antenna on a radio node are averaged, obtain the large scale channel fading parameters between terminal and this radio node; A plurality of multipath fading parameters that perhaps one-shot measurement of a plurality of antennas on a radio node obtained average, and obtain the large scale channel fading parameters between terminal and this radio node.
Preferably, selecting the radio node that communicates with terminal from one group of radio node specifically comprises: terminal receives signal and signal power is measured from one group of radio node, calculates on radio node each antenna to the multipath fading parameter of terminal according to the transmitting power of the antenna on radio node; For each radio node, its small scale channel fading parameters is averaged to obtain the large scale channel fading parameters of this radio node; Select a minimum value from the large scale channel fading parameters of one group of radio node, the radio node that it is corresponding is as basic access point; The large scale channel fading parameters of other value in the large scale channel fading parameters of one group of radio node with basic access point compared, with difference wherein less than the corresponding radio node of large scale channel fading parameters of default thresholding as the additional access point that communicates with terminal; With basic access point and additional access point jointly as selected radio node; The radio node that terminal reports it to select to network side.
Preferably, the small scale channel fading parameters is averaged so that the small scale channel fading parameters is averaged specifically comprise: repeatedly the measure a plurality of multipath fading parameters that obtain of a terminal to one or more antenna on a radio node are averaged, obtain the large scale channel fading parameters between this terminal and this radio node; Perhaps a terminal is averaged a plurality of multipath fading parameters that the one-shot measurement on a radio node obtains, element in the channel impulse response matrix that perhaps terminal of many antennas is obtained averages, and obtains the large scale channel fading parameters between this terminal and this radio node.
Preferably, institute's terminal specifically comprises from one group of radio node reception signal: terminal receives the reference signal that radio node sends; Or the antenna identification signal corresponding with each antenna of radio node, the antenna identification signal is mutually orthogonal pseudo random sequence.
Preferably, obtaining the multipath fading parameter specifically comprises: under the antenna on radio node and the condition of the variation of the relative position between the antenna on terminal less than half wavelength, by the signal of radio node measuring terminals emission, perhaps measured the signal of radio node emission by terminal; Wherein, when radio node and or terminal adopt multi-antenna structure, each reception antenna is to measuring respectively to obtain the multipath fading parameter from the signal strength signal intensity of a plurality of transmitting antennas.
Preferably, the multipath fading parameter comprises: the channel impulse response between the antenna of terminal and the antenna of radio node or channel impulse response matrix; Or the small scale channel fading matrix between the antenna of the antenna of the terminal that is gone out by the channel impulse response between the antenna of the antenna of terminal and radio node or channel impulse response matrix computations and radio node.
Preferably, also comprise: default thresholding is set less than or equal to 3 decibels.
Preferably, ability comprise following one of at least: the multi-emitting passage is emissivities simultaneously; Switching capability in emission process between many antennas; The parallel ability that sends data flow on different frequency bands.
Preferably, the multi-emitting passage simultaneously emissivities comprise: whether support Space Time Coding and or no support beam shaping.
Preferably, network side is that terminal selects mode of operation specifically to comprise according to the ability of the multipath fading parameter between terminal and one group of radio node and terminal: if selected radio node is a radio node, and the small scale channel fading between all antennas of terminal and this radio node is over half less than the small scale channel fading of terminal and other radio node, between designated terminal and radio node with the mode work of single-input single-output or with the work of single many way of outputs of input; If selected radio node is a radio node, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of terminal and a plurality of radio nodes and terminal and other radio node is suitable, forbids the selected radio node of terminal access.
Preferably, network side is that terminal selects mode of operation specifically to comprise according to the ability of the multipath fading parameter between terminal and one group of radio node and terminal: if selected radio node is a plurality of radio nodes, and the mean value of the small scale channel fading between all antennas of terminal and a plurality of radio nodes is over half less than the small scale channel fading value of terminal and other radio node, specifies selected a plurality of radio node with the signal of the mode receiving terminal emission of receive diversity; If selected radio node is a plurality of radio nodes, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of terminal and a plurality of radio nodes and terminal and other radio node is suitable, forbids the selected radio node of terminal access.
preferably, network side is that terminal selects mode of operation specifically to comprise according to the ability of the multipath fading parameter between terminal and one group of radio node and terminal: if selected radio node is a radio node, and the small scale channel fading between all antennas of terminal and this radio node is over half less than the small scale channel fading of terminal and other radio node, and have good independence between each sub-channels that forms between terminal antenna and radio node antenna, between designated terminal and radio node, the mode with multiple-input and multiple-output is worked, if selected radio node is a radio node, and has good independence between each sub-channels that forms between terminal antenna and radio node antenna, and it is over half that the small scale channel fading between all antennas of terminal and this radio node is not less than the small scale channel fading of terminal and other radio node, between designated terminal and radio node, the mode with multiple-input and multiple-output is worked, and terminal is set carries out beam shaping in the process that transmits to the radio node of selecting, the power that the signal of selected radio node is mail in setting strengthens, the power that other radio node is mail in setting reduces, if selected radio node is a radio node, and between each sub-channels that forms between terminal antenna and radio node antenna, correlation is higher than predetermined value, between designated terminal and radio node, the mode with beam shaping is worked, and terminal is set carries out beam shaping in the process that transmits to the radio node of selecting, the power that the signal of selected radio node is mail in setting strengthens, and the power that mails to other radio node is set reduces.
Preferably, network side is that terminal selects mode of operation specifically to comprise according to the ability of the multipath fading parameter between terminal and one group of radio node and terminal: select one group of antenna from all antennas of selected a plurality of radio nodes, this group antenna has following features: 1) terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, and terminal antenna is over half to the mean value of the mean value of the channel impulse response matrix of this group antenna channel impulse response matrix of the antenna to other radio node greater than terminal antenna; 2) terminal antenna to the correlation of interchannel of this group antenna lower than predetermined value; Work in the mode of multiple-input and multiple-output between designated terminal and this group antenna; Select one group of antenna from all antennas of selected a plurality of radio nodes, this group antenna has following features: 1) terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, and terminal antenna to mean value of the channel impulse response matrix of this group antenna to be not more than the mean value of channel impulse response matrix of the antenna of terminal antenna to other radio node over half; 2) terminal antenna to the correlation of interchannel of this group antenna lower than predetermined value; Work in the mode of multiple-input and multiple-output between designated terminal and this group antenna, and terminal is set carries out beam shaping in the process that transmits to selected radio node, the power that the signal of selected radio node is mail in setting strengthens, and the power that mails to other radio node is set reduces; Terminal antenna with the correlation of interchannel that belongs to each antenna on same selected radio node higher than predetermined value, designated terminal and belong between the antenna of different radio node respectively mode parallel transmission with beam shaping, the power increasing that terminal mails to the signal of selected radio node is set, the power that mails to other radio node is set reduces; There is not available identical frequency spectrum resource on selected different radio node, and there is the idle running time-frequency resource that belongs to different frequency bands on different radio nodes, the different passages that multichannel terminal is set work in respectively on the idle running time-frequency resource of different radio node, terminal uses different frequency bands to send data to different radio nodes respectively, and terminal is being worked in the mode of spatial reuse or beam shaping on different frequency bands and between the different radio node, to different radio nodes transmitting data stream concurrently.
Preferably, the mode of operation that terminal uses network side to issue, utilizing the resource of distributing to send data to selected radio node specifically comprises: terminal is according to its measurement that radio node is on every side transmitted, the mode of operation that network side is issued is optimized, stronger so that the power that terminal that selected radio node receives transmits to be set, and it is more weak that the power that terminal that other radio node receives transmits is set.
The method of above-described embodiment is because adopt the large scale fading parameter of channel, so overcome the problem that prior art only is only applicable to single antenna, thereby can allow between terminal and of optimizing or one group of WAP (wireless access point) when carrying out the multithread parallel transmission, effectively suppress this transmission to the uplink interference of other WAP (wireless access point) or adjacent cell.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows a kind of terminal measurement of existing inhibition presence of intercell interference and reports the method schematic diagram of path loss;
Fig. 2 shows the schematic diagram according to a kind of tdd systems of the embodiment of the present invention;
Fig. 3 shows according to suppressing the flow chart of the method for inter-cell uplink interference in the tdd systems of the embodiment of the present invention.
Embodiment
Fig. 3 shows according to suppressing the flow chart of the method for inter-cell uplink interference in the tdd systems of the embodiment of the present invention, comprises the following steps:
Step S301, network side select the radio node that communicates with terminal according to the large scale fading parameter of terminal to one group of radio node from this group radio node;
Step S302, network side is that terminal is selected mode of operation according to the ability of the multipath fading parameter between terminal and this group radio node and terminal, and is the resource on the selected radio node of terminal distribution;
Step S303, the mode of operation that terminal uses network side to issue utilizes the resource of distributing to send data to selected radio node.
The method is selected the radio node that communicates with terminal according to the large scale fading parameter of channel, and utilizes mode of operation that the multipath fading characteristic of channel selects to optimize, suppresses terminal to the adjacent cell uplink interference.The method can be applied to comprise two or more with the radio node of TDD mode work, and the wireless access system of at least one terminal.
In step S301, network based terminal is to the large scale fading parameter of one group of radio node, and the concrete grammar of selecting the radio node that communicates with described terminal from this group radio node can be a kind of of following mode:
Preferably, radio node selection mode one comprises the steps:
The first step: one group of radio node is synchronously measured the channel detection signal power of terminal emission, and calculates terminal to the multipath fading parameter of each radio node according to the transmitting power of terminal.The concrete acquisition methods of multipath fading parameter is: under the antenna on radio node and the relative position between the antenna on terminal change condition less than half wavelength, signal by the emission of radio node measuring terminals, perhaps, measured the signal of radio node emission by terminal; Wherein, when radio node and or terminal adopt multi-antenna structure, each reception antenna is to measuring respectively to obtain the multipath fading parameter from the signal strength signal intensity of a plurality of transmitting antennas.
Second step: the small scale channel fading parameters is averaged, obtain the large scale channel fading parameters.Can adopt one of following two kinds of methods to obtain the large scale channel fading parameters:
Method 1: a plurality of multipath fading parameters that obtain of repeatedly measuring of one or more antenna on a radio node are averaged, obtain the large scale channel fading parameters between terminal and this radio node;
Method 2: a plurality of multipath fading parameters that the one-shot measurement of a plurality of antennas on a radio node is obtained average, and obtain the large scale channel fading parameters between terminal and this radio node.
The 3rd step: select a minimum value from one group of large scale channel fading parameters, the radio node that it is corresponding is as basic access point.
The 4th step: the large scale channel fading parameters of other value in described one group of large scale channel fading parameters with basic access point compared, concrete grammar is: will deduct the large scale channel fading parameters value corresponding with basic access point in other value in described one group of large scale channel fading parameters respectively, with difference less than radio node corresponding to the large scale channel fading parameters of thresholding TH as the additional access point that communicates with terminal.The number of replenishing access point can be 0,1,2,3.N, and typically, the number of replenishing access point is 1～2.Can preset the comparison threshold TH1 of a large scale decline, TH1 represents the difference threshold of two large scale decline values.Usually TH1 is made as certain value that is less than or equal to 3 decibels.
The 5th step: with basic access point and additional access point jointly as the radio node that communicates with terminal of selecting.
Preferably, radio node selection mode two comprises the steps:
The first step: terminal receives signal and signal power is measured from one group of radio node, and terminal calculates on radio node each antenna to the multipath fading parameter of terminal according to the transmitting power of the antenna on radio node.The concrete acquisition methods of multipath fading parameter is: under the antenna on radio node and the relative position between the antenna on terminal change condition less than half wavelength, signal by the emission of radio node measuring terminals, perhaps, measured the signal of radio node emission by terminal; Wherein, when radio node and or terminal adopt multi-antenna structure, each reception antenna is to measuring respectively to obtain the multipath fading parameter from the signal strength signal intensity of a plurality of transmitting antennas.
Second step: the small scale channel fading parameters is averaged, obtain the large scale channel fading parameters.Can adopt one of following two kinds of methods to obtain the large scale channel fading parameters:
Method 1: repeatedly the measure a plurality of multipath fading parameters that obtain of a terminal to one or more antenna on a radio node are averaged, obtain the large scale channel fading parameters between terminal and this radio node;
Method 2 a: terminal is averaged a plurality of multipath fading parameters that the one-shot measurement on a radio node obtains, perhaps the element in the channel impulse response matrix of multi-antenna wireless terminal acquisition is averaged, obtain the large scale channel fading parameters between terminal and this radio node.
The 3rd step: select a minimum value from one group of large scale channel fading parameters, the radio node that it is corresponding is as basic access point.
The 4th step: the large scale channel fading parameters of other value in described one group of large scale channel fading parameters with basic access point compared, concrete grammar is: will deduct the large scale channel fading parameters value corresponding with basic access point in other value in described one group of large scale channel fading parameters respectively, with difference less than radio node corresponding to the large scale channel fading parameters of thresholding TH1 as the additional access point that communicates with terminal.The number of replenishing access point can be 0,1,2,3.N, and typically, the number of replenishing access point is 1～2.Can preset the comparison threshold TH1 of a large scale decline, TH1 represents the difference threshold of two large scale decline values.Usually TH1 is made as certain value that is less than or equal to 3 decibels.
The 5th step: with basic access point and additional access point jointly as the radio node that communicates with terminal of selecting.
The 6th step: the radio node that terminal reports it to select to network.
In radio node selection mode two, the signal of the radio node emission that terminal is measured can be that following signal is a kind of:
A) reference signal of radio node transmission;
B) the antenna identification signal corresponding with each antenna, this signal is mutually orthogonal pseudo random sequence.
The concrete acquisition methods of the concrete acquisition methods of step S302 Small and Medium Sized fading parameter and step S301 Small and Medium Sized fading parameter can be identical: under the antenna on radio node and the relative position between the antenna on terminal change condition less than half wavelength, signal by the emission of radio node measuring terminals, perhaps, measured the signal of radio node emission by terminal.Here the small scale channel fading parameters of obtaining is a kind of of following form:
1) channel impulse response between terminal antenna and radio node antenna or channel impulse response matrix;
2) terminal antenna that goes out according to the channel impulse response between terminal antenna and radio node antenna or channel impulse response matrix computations and the small scale channel fading matrix between the radio node antenna, this small scale channel fading matrix also can be regarded as the instantaneous path loss matrix between terminal antenna and radio node antenna.
In step S302, the ability of terminal can be one or more combination of following ability:
Terminal capability 1: the multi-emitting passage is emissivities simultaneously.Comprise further: whether support Space Time Coding; Whether support beam shaping;
Terminal capability 2: the switching capability in emission process between many antennas;
Terminal capability 3: the parallel ability that sends data flow on different frequency bands;
Multipath fading parameter in step S302 between network based terminal and one group of radio node and the ability of terminal are that terminal is selected mode of operation, and the resource on the radio node of selecting for terminal distribution; Preferably, concrete methods of realizing is:
The first step: according to ability and the small scale channel fading parameters of terminal, take following method as terminal assigned work pattern:
1) for communicating by letter between single transmit channel end and a radio node, comprise one of following selection course:
If selected what go out is a radio node, and the small scale channel fading between all antennas of terminal and this node is significantly less than the small scale channel fading of terminal and other node, between designated terminal and radio node with the mode work of single-input single-output or with the work of single many way of outputs of input;
If selected what go out is a radio node, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of terminal and a plurality of nodes and terminal and other node is suitable, for fear of the interference of terminal to other radio node, the radio node that does not allow the terminal access select.
2) for communicating by letter between single transmit channel end and a plurality of radio nodes, comprise one of following selection course:
If selected what go out is a plurality of radio nodes, and the mean value of the small scale channel fading between all antennas of terminal and a plurality of nodes is significantly less than the small scale channel fading value of terminal and other node, specifies a plurality of radio nodes of selecting with the signal of the mode receiving terminal emission of receive diversity.Significantly over half less than the multipath fading value of terminal each antenna to other radio node less than the mean value that refers to select the multipath fading of each antenna on terminal and the radio node of selecting out here;
If selected what go out is a plurality of radio nodes, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of terminal and a plurality of nodes and terminal and other node is suitable, for fear of the interference of terminal to other radio node, the radio node that does not allow the terminal access select;
3) for communicating by letter between multi-emitting channel end and a radio node, comprise one of following selection course:
If selected what go out is a radio node, and the small scale channel fading between all antennas of terminal and this node is significantly less than the small scale channel fading of terminal and other node, and have good independence between each sub-channels that forms between terminal antenna and radio node antenna, between designated terminal and radio node, the mode with multiple-input and multiple-output is worked;
if selected what go out is a radio node, and has good independence between each sub-channels that forms between terminal antenna and radio node antenna, but the small scale channel fading between all antennas of terminal and this node is not significantly less than the small scale channel fading of terminal and other node, between designated terminal and radio node, the mode with multiple-input and multiple-output is worked, and allow terminal in the process that transmits to the radio node of selecting, carry out beam shaping, allow the power of the signal that mails to the radio node of selecting strengthen, allow the power that mails to other radio node reduce,
If selected what go out is a radio node, and between each sub-channels that forms between terminal antenna and radio node antenna, correlation is very strong, between designated terminal and radio node, the mode with beam shaping is worked, and allow terminal in the process that transmits to the radio node of selecting, carry out beam shaping, allow the power of the signal that mails to the radio node of selecting strengthen, allow the power that mails to other radio node reduce, concrete methods of realizing is: terminal is weighted the phase place that transmits and the amplitude of different transmission channels;
4) for communicating by letter between multi-emitting channel end and a plurality of radio nodes, can comprise one of following selection course:
Process 1: select one group of antenna from all antennas of a plurality of radio nodes of selecting, this group antenna has following features: 1) terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, and terminal antenna is to the remarkable mean value of the channel impulse response matrix of the antenna to other radio node greater than terminal antenna of the mean value of the channel impulse response matrix of this group antenna; 2) terminal antenna is low to the correlation of the interchannel of this group antenna.Designated terminal and this group belong between the antenna of different radio node and work in the mode of multiple-input and multiple-output;
Process 2: select one group of antenna from all antennas of a plurality of radio nodes of selecting, this group antenna has following features: 1) terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, but terminal antenna is to the mean value of the channel impulse response matrix of this group antenna remarkable mean value of the channel impulse response matrix of the antenna to other radio node greater than terminal antenna not; 2) terminal antenna is low to the correlation of the interchannel of this group antenna.Designated terminal and this group belong between the antenna of different radio node and work in the mode of multiple-input and multiple-output, and further, allow terminal in the process that transmits to the radio node of selecting, carry out beam shaping, allow the power of the signal that mails to the radio node of selecting strengthen, allow the power that mails to other radio node reduce;
Process 3: terminal antenna is strong with the correlation of the interchannel that belongs to each antenna on the same radio node of selecting.Designated terminal and belonging between the antenna of different radio node respectively with the mode parallel transmission of beam shaping, the power of the signal of the radio node that allows terminal mail to select strengthens, and allows the power that mails to other radio node reduce;
Process 4: on the different radio node of selecting, there is not available identical frequency spectrum resource, can't in the mode of spatial reuse or space diversity work between terminal and different radio node this moment, but, there is the idle running time-frequency resource that belongs to different frequency bands on different radio nodes, in this case, the different passages of network control multichannel terminal work in respectively on the idle running time-frequency resource of different radio node, and terminal uses different frequency bands to send data to different radio nodes respectively.Further, terminal is being worked in the mode of spatial reuse or beam shaping on different frequency bands and between the different radio node, to different radio nodes transmitting data stream concurrently.
Terminal in step S303 uses the mode of operation that network issues to send data to the radio node of selecting, preferably, concrete grammar is: terminal is according to its measurement that radio node is on every side transmitted, the mode of operation that network is issued is optimized, so that the power that allows terminal that the radio node selected receives transmit is stronger, and the power that allows terminal that other radio node receives transmit is more weak.
Existing method does not provide when terminal and/or base station have a plurality of antenna, how to allow network obtain for the method for the λ i of every pair of transceiver channel and suppress accordingly the transmission method that adjacent cell is disturbed; Also be not given in a plurality of potential can carrying out in the situation of the base station that the multithread parallel transmission communicates by letter with terminal, base station and the terminal of selecting two or more from potential base station communicate and suppress method to the interference of other base station.In addition, in existing method in order to allow the scheduler in base station processor obtain more complete λ ij, need the larger expense that reports, in addition, in the TDD system, terminal need to wait for the time of a radio frames (5ms) from downstream signal measure being obtained λ ij to the up Φ of reporting i, and this has caused scheduling gain under the quick time-varying channel and the reduction of interference suppressioning effect.
And the method for above preferred embodiment is selected the radio node that communicates with terminal by the large scale fading parameter that utilizes channel, on this basis, utilize mode of operation that the multipath fading characteristic of channel selects to optimize, suppress terminal to the adjacent cell uplink interference.Said method can be according to the channel condition between terminal and one group of radio node, select neatly suitable WAP (wireless access point) to communicate with suitable mode of operation and terminal, can allow when carrying out the multithread parallel transmission between terminal and of optimizing or one group of WAP (wireless access point), effectively suppress this transmission to the uplink interference of other WAP (wireless access point) or adjacent cell.
Embodiment: suppress inter-cell uplink interference by the switching between terminal antenna
Fig. 2 sees in a kind of tdd systems system, comprises 3 with the radio node 202,203,204 of TDD mode work, and radio node can be single antenna, can be also many antennas.1 Base-Band Processing and control unit 201 that is connected with radio node 202,203,204 by optical-fibre channel, and channel end 206 is received/sent out to several 2 antennas 2.
3 radio nodes 202,203,204 with the work of TDD mode cover respectively three adjacent regional 202a, 203a and 204a.Radio node 202,203,204 is under Base-Band Processing and control unit 201,211 and 221 control, issue the channel detection signal 2. in the zone of its covering, and issuing channel detection signal transmission power level 2., 2. the channel detection signal is used to the channel fading parameters between terminal measuring terminals and radio node.
Base-Band Processing and control unit 201 comprise as lower module: baseband processing module; Dispatching control module.Base-Band Processing and control unit carry out Base-Band Processing and scheduling controlling to radio node 202,203,204 respectively.Baseband processing module in Base-Band Processing and control unit carries out Base-Band Processing to the channel detection signal that the channel detection signal sent out on terminal 206 and radio node issue.
The detectable signal ability 1. of posting a letter on two antenna terminals 206 have can be to radio node transmitting channel detectable signal on the some or all of available band of radio node.In order to suppress the interference to the neighbor cell radio node, two antenna terminals 206 are selected a kind of mode of operation as terminal from following mode of operation: 1) dynamically select one and be used for the emission upstream data 3., 2 in two antennas) 3. the mode processed when using simultaneously two transmitting antennas with sky send data to the radio node of service.
In said system, realize as follows suppressing in tdd systems inter-cell uplink interference:
Step S301: network based terminal is to the large scale fading parameter of one group of radio node, and the concrete steps of selecting the radio node that communicates with described terminal from this group radio node are:
The first step: 1. the radio node 202,203,204 of network side synchronously receives respectively on several terminals the channel detection signal sent out, the channel detection signal of terminal 206a is emission simultaneously on two antennas respectively 1., and gives Base-Band Processing and control unit 201 with described detectable signal by optical fiber transmission;
Second step: 1. 201 pairs of channel detection signals of Base-Band Processing and control unit carry out Base-Band Processing, obtain a terminal, with this terminal ascend the throne terminal 206a, the channel impulse response on each antenna on radio node 202,203,204 respectively;
The 3rd step: Base-Band Processing and control unit 201 average to process to the channel impulse response of the same terminal that obtains on each antenna on radio node 202,203,204 further and obtain the single channel impulse response average of terminal 206a on each radio node, further, a plurality of values of 201 pairs of described single channel impulse response averages of Base-Band Processing and control unit average processing, obtain 3 respectively with radio node 202,203,204 corresponding large scale fading parameter values;
The 4th step: Base-Band Processing and control unit 201 are selected minimum from 3 large scale channel fading parameters, and this minimum channel fading parameter value is corresponding to radio node 202;
The 5th step: Base-Band Processing and control unit 201 from radio node 203,204 corresponding large scale fading parameter values deduct minimum channel fading parameter value, obtain two differences.Two differences that obtain are compared with thresholding TH1 respectively, and comparative result is that two differences are all greater than TH1, so 201 of Base-Band Processing and control units select radio node 202 and terminal 206a to communicate;
Step S302: the multipath fading parameter between network based terminal and one group of radio node and the ability of terminal are that terminal is selected mode of operation, and the resource on the radio node of selecting for terminal distribution.
The specific implementation step of step S302 is:
A step: radio node 202,203,204 respectively synchronously the channel detection signal of measuring terminals 206a emission 1., obtain channel impulse response or the channel impulse response matrix of each antenna on two antennas of terminal 206a and radio node 202,203,204.Further, in conjunction with the channel detection signal reference power 1. of terminal 206a emission, by calculating to obtain to embody the path loss of multipath fading size, thereby obtain terminal to the channel fading state of described three radio nodes.
The B step: suppress the adjacent cell radio node is disturbed by the sky line options.In Fig. 2, Base-Band Processing and control unit 201 be the multipath fading parameter of each antenna of two antenna to three radio nodes 202,203,204 of computing terminal respectively, result of calculation is: in a time interval, the first transmission channel of terminal 206a to the mean value of the multipath fading value of each antenna of the radio node 202 of selecting significantly less than the second transmission channel of terminal 206a mean value to the multipath fading value of each antenna of the radio node 202 of selecting; And, the mean value of the multipath fading value of the radio node 203 that the first transmission channel of terminal 206a is not significantly extremely selected less than this antenna to the mean value of the multipath fading value of each antenna of the radio node 202 of selecting, each antenna of 204, so Base-Band Processing and control unit 201 determine that the first transmission channel and day alignment radio node 202 that allow terminal 206a use terminal 206a transmit;
Step S303: terminal uses the mode of operation that network issues to send data to the radio node of selecting.
Concrete methods of realizing is: terminal sends data to radio node 202 on the resource location that network issues.
Further, 206a is according to its radio node that measures 203,204 directional information, launch the data identical with the first antenna with suitable amplitude and phase place on the second antenna of terminal 206a, the spatial coherence of the signal by two antennas, the signal that mails to radio node 202 is further enhanced, makes and mail to radio node 203,204 signal further weakens.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only 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 modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (16)
1. suppress the method for inter-cell uplink interference in a tdd systems, it is characterized in that, comprise the following steps:
Network side is selected the radio node that communicates with described terminal according to the large scale channel fading parameters of terminal to one group of radio node from described one group of radio node;
Described network side is that described terminal is selected mode of operation according to the ability of the small scale channel fading parameters between described terminal and described one group of radio node and described terminal, and is the resource on the selected radio node of described terminal distribution;
The described mode of operation that described terminal uses described network side to issue utilizes the resource of distributing to send data to selected radio node;
Wherein, selecting the radio node that communicates with described terminal from described one group of radio node specifically comprises:
Select a minimum value from the large scale channel fading parameters of described one group of radio node, the radio node that it is corresponding is as basic access point;
The large scale channel fading parameters of other value in the large scale channel fading parameters of described one group of radio node and described basic access point is compared, with difference wherein less than the corresponding radio node of large scale channel fading parameters of default thresholding as the additional access point that communicates with described terminal;
With described basic access point and additional access point jointly as selected radio node.
2. method according to claim 1, is characterized in that, selects the radio node that communicates with described terminal and specifically also comprise from described one group of radio node:
Described one group of radio node is synchronously measured the channel detection signal power of described terminal emission, and calculates described terminal to the described small scale channel fading parameters of each described radio node according to the transmitting power of described terminal;
For each described radio node, its described small scale channel fading parameters is averaged to obtain the described large scale channel fading parameters of this radio node.
3. method according to claim 2, is characterized in that, described small scale channel fading parameters averaged to obtain described large scale channel fading parameters average specifically and comprise:
A plurality of described small scale channel fading parameters that obtains of repeatedly measuring of one or more antenna on a described radio node is averaged, obtain the described large scale channel fading parameters between described terminal and this radio node; Perhaps
A plurality of described small scale channel fading parameters that the one-shot measurement of a plurality of antennas on a described radio node is obtained averages, and obtains the described large scale channel fading parameters between described terminal and this radio node.
4. method according to claim 1, is characterized in that, selects the radio node that communicates with described terminal and specifically comprise from described one group of radio node:
Described terminal receives signal and signal power is measured from described one group of radio node, calculates on described radio node each antenna to the small scale channel fading parameters of described terminal according to the transmitting power of the antenna on described radio node;
For each described radio node, its described small scale channel fading parameters is averaged to obtain the described large scale channel fading parameters of this radio node;
Select a minimum value from the large scale channel fading parameters of described one group of radio node, the radio node that it is corresponding is as basic access point;
The large scale channel fading parameters of other value in the large scale channel fading parameters of described one group of radio node and described basic access point is compared, with difference wherein less than the corresponding radio node of large scale channel fading parameters of default thresholding as the additional access point that communicates with described terminal;
With described basic access point and additional access point jointly as selected radio node;
The radio node that described terminal reports it to select to described network side.
5. method according to claim 4, is characterized in that, described small scale channel fading parameters averaged so that described small scale channel fading parameters is averaged specifically comprise:
Repeatedly the measure a plurality of described small scale channel fading parameters that obtain of a described terminal to one or more antenna on a described radio node averaged, obtain the described large scale channel fading parameters between this terminal and this radio node; Perhaps
A described terminal is averaged a plurality of described small scale channel fading parameters that the one-shot measurement on a described radio node obtains, element in the channel impulse response matrix that perhaps the described terminal of many antennas is obtained averages, and obtains the described large scale channel fading parameters between this terminal and this radio node.
6. method according to claim 4, is characterized in that, described terminal receives signal from described one group of radio node and specifically comprises:
Described terminal receives the reference signal that described radio node sends, or the antenna identification signal corresponding with each antenna of described radio node, and described antenna identification signal is mutually orthogonal pseudo random sequence.
7. according to claim 2 or 4 described methods, is characterized in that, obtains described small scale channel fading parameters and specifically comprise:
Under the condition of the variation of the relative position between the antenna on the antenna on described radio node and described terminal less than half wavelength, measured the signal of described terminal emission by described radio node, perhaps measured the signal of described radio node emission by described terminal;
Wherein, when described radio node and or described terminal adopt multi-antenna structure, each reception antenna is to measuring respectively to obtain described small scale channel fading parameters from the signal strength signal intensity of a plurality of transmitting antennas.
8. method according to claim 7, is characterized in that, described small scale channel fading parameters comprises:
Channel impulse response between the antenna of described terminal and the antenna of described radio node or channel impulse response matrix; Or
Small scale channel fading matrix between the antenna of the described terminal that is gone out by the channel impulse response between the antenna of the antenna of described terminal and described radio node or channel impulse response matrix computations and the antenna of described radio node.
9. according to claim 2 or 4 described methods, is characterized in that, also comprises: described default thresholding is set less than or equal to 3 decibels.
10. method according to claim 1, is characterized in that, the ability of described terminal comprise following one of at least:
The multi-emitting passage is emissivities simultaneously;
Switching capability in emission process between many antennas;
The parallel ability that sends data flow on different frequency bands.
11. method according to claim 10 is characterized in that, described multi-emitting passage emissivities simultaneously comprises: whether support Space Time Coding and or no support beam shaping.
12. method according to claim 1 is characterized in that, described network side is that described terminal selects mode of operation specifically to comprise according to the ability of the small scale channel fading parameters between described terminal and described one group of radio node and described terminal:
If selected radio node is a radio node, and the small scale channel fading between all antennas of described terminal and this radio node is over half less than the small scale channel fading of described terminal and other radio node, specifies between described terminal and radio node with the mode work of single-input single-output or with the work of single many way of outputs of input;
If selected radio node is a radio node, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of described terminal and a plurality of radio nodes and described terminal and other radio node is suitable, forbids the selected radio node of described terminal access.
13. method according to claim 1 is characterized in that, described network side is that described terminal selects mode of operation specifically to comprise according to the ability of the small scale channel fading parameters between described terminal and described one group of radio node and described terminal:
If selected radio node is a plurality of radio nodes, and the mean value of the small scale channel fading between all antennas of described terminal and a plurality of radio nodes is over half less than the small scale channel fading value of described terminal and other radio node, specifies selected a plurality of radio node to receive the signal of described terminal emission in the mode of receive diversity;
If selected radio node is a plurality of radio nodes, and the small scale channel fading value of the mean value of the small scale channel fading between all antennas of described terminal and a plurality of radio nodes and described terminal and other radio node is suitable, forbids the selected radio node of described terminal access.
14. method according to claim 1 is characterized in that, described network side is that described terminal selects mode of operation specifically to comprise according to the ability of the small scale channel fading parameters between described terminal and described one group of radio node and described terminal:
If selected radio node is a radio node, and the small scale channel fading between all antennas of described terminal and this radio node is over half less than the small scale channel fading of described terminal and other radio node, and have good independence between each sub-channels that forms between described terminal antenna and radio node antenna, specify between described terminal and radio node the mode with multiple-input and multiple-output to work;
if selected radio node is a radio node, and has good independence between each sub-channels that forms between described terminal antenna and radio node antenna, and it is over half that the small scale channel fading between all antennas of described terminal and this radio node is not less than the small scale channel fading of described terminal and other radio node, specify between described terminal and radio node the mode with multiple-input and multiple-output to work, and described terminal is set carries out beam shaping in the process that transmits to the radio node of selecting, the power that the signal of selected radio node is mail in setting strengthens, the power that other radio node is mail in setting reduces,
If selected radio node is a radio node, and between each sub-channels that forms between described terminal antenna and radio node antenna, correlation is higher than predetermined value, specify between described terminal and radio node the mode with beam shaping to work, and described terminal is set carries out beam shaping in the process that transmits to the radio node of selecting, the power that the signal of selected radio node is mail in setting strengthens, and the power that mails to other radio node is set reduces.
15. method according to claim 1 is characterized in that, described network side is that described terminal selects mode of operation specifically to comprise according to the ability of the small scale channel fading parameters between described terminal and described one group of radio node and described terminal:
Select one group of antenna from all antennas of selected a plurality of radio nodes, this group antenna has following features: 1) described terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, and described terminal antenna is over half to the mean value of the mean value of the channel impulse response matrix of this group antenna channel impulse response matrix of the antenna to other radio node greater than described terminal antenna; 2) described terminal antenna to the correlation of interchannel of this group antenna lower than predetermined value; Specify between described terminal and this group antenna and work in the mode of multiple-input and multiple-output;
Select one group of antenna from all antennas of selected a plurality of radio nodes, this group antenna has following features: 1) described terminal antenna is maximum to the mean value of the channel impulse response matrix of this group antenna, and described terminal antenna to mean value of the channel impulse response matrix of this group antenna to be not more than the mean value of channel impulse response matrix of the antenna of described terminal antenna to other radio node over half; 2) described terminal antenna to the correlation of interchannel of this group antenna lower than predetermined value; Specify between described terminal and this group antenna and work in the mode of multiple-input and multiple-output, and described terminal is set carries out beam shaping in the process that transmits to selected radio node, the power that the signal of selected radio node is mail in setting strengthens, and the power that mails to other radio node is set reduces;
Described terminal antenna with the correlation of interchannel that belongs to each antenna on same selected radio node higher than predetermined value, specify described terminal and belong between the antenna of different radio node respectively mode parallel transmission with beam shaping, the power increasing that described terminal mails to the signal of selected radio node is set, the power that mails to other radio node is set reduces;
There is not available identical frequency spectrum resource on selected different radio node, and there is the idle running time-frequency resource that belongs to different frequency bands on different radio nodes, the different passages that multichannel described terminal is set work in respectively on the idle running time-frequency resource of different radio node, described terminal uses different frequency bands to send data to different radio nodes respectively, and described terminal is being worked in the mode of spatial reuse or beam shaping on different frequency bands and between the different radio node, to different radio nodes transmitting data stream concurrently.
16. method according to claim 1 is characterized in that, the described mode of operation that described terminal uses described network side to issue is utilized the resource of distributing to send data to selected radio node and is specifically comprised:
Described terminal is according to its measurement that described radio node is on every side transmitted, the mode of operation that described network side is issued is optimized, stronger so that the power that described terminal that selected radio node receives transmits to be set, and it is more weak that the power that described terminal that other radio node receives transmits is set.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6782035B1 (en) * | 1997-04-17 | 2004-08-24 | Ntt Docomo Inc. | Base station apparatus of mobile communication system |
| CN101150825A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | A method, system, base station and terminal for detecting interference neighbors |
| CN101179807A (en) * | 2006-11-09 | 2008-05-14 | 中国电信股份有限公司 | Method of configuring anti-interference capability testing system of mobile communication system cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6782035B1 (en) * | 1997-04-17 | 2004-08-24 | Ntt Docomo Inc. | Base station apparatus of mobile communication system |
| CN101150825A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | A method, system, base station and terminal for detecting interference neighbors |
| CN101179807A (en) * | 2006-11-09 | 2008-05-14 | 中国电信股份有限公司 | Method of configuring anti-interference capability testing system of mobile communication system cell |
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