CN102571284B - Channel measuring method for LTE (Long Term Evolution) system - Google Patents
Channel measuring method for LTE (Long Term Evolution) system Download PDFInfo
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Abstract
The invention discloses a channel measuring method for a LTE (Long Term Evolution) system. The method is suitable for a CoMP working mode and comprises the following steps that: a base station marks off a reference mark placement region in a PDSCH (Physical Downlink Shared Channel), sets a plurality of reference marks in the reference mark placement region and sets a resource configuration mode with an identifier for each signal launching point in the CoMP; a terminal carries out channel measurement on each signal launching point according to the resource configuration modes and position information of the reference mark placement region, which re sent by the base station; the terminal feeds back the identifiers of the selected resource configuration modes which meet preset conditions to the base station; and the base station searches the corresponding signal launching points according to the identifier of the resource configuration modes, which are fed back by the terminal, and carries out channel measurement on the signal launching points by using CSI-RS (Channel State Indication Reference Signal) resources. According to the method provided by the invention, the problem of CSI-RS resource tension in the existing CoMP mode can be solved and the resource utilization rate of the PDSCH is improved.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of LTE system channel measuring method.
Background technology
Long Term Evolution (LTE, Long Term Evolution) project is the evolution of 3G, and it improves and enhances the aerial access technology of 3G.Adopt OFDM (OFDM, Orthogonal Frequency Division Multiplexing) and MIMO (multiple-input and multiple-output, Multiple-Input Multiple-Out-put) as the sole criterion of its wireless network evolution.The peak rate of descending 100Mbit/s and up 50Mbit/s can be provided under 20MHz spectral bandwidth.Improve the performance of Cell Edge User, improve cell capacity, and reduce system delay.
In Rel 11, multi-point cooperative (CoMP, Cordinated multi-point) is a kind of MIMO technology, by the cooperation of multiple signal launch point, can contribute to carrying high performance signal by being originally that the signal of interference becomes.
CoMP is as a branch of MIMO technology, and other types usage exists common part, but also has unique consideration point due to the difference of working method.
Power distribution problems: in traditional mimo system, because each antenna is all placed in base station, therefore their transmitting power is limited by total base station power.And for CoMP, the Power Limitation at each eNB/RRH place of possibility is different, different optimization conclusions therefore can be caused.Such as, whether the code book of constant power design is suitable.
Complexity issue: because CoMP is that the eNB/RRH/antenna that multiple geography is separated participates in jointly, therefore the performance optimization problem of the whole users under multiple MPS process will be considered, process complexity becomes non-linear growth, therefore corresponding to user scheduling, the various aspects such as channel estimating are proposed higher requirement.
Delay problem: for traditional colocation site mimo system, substantially exceed consider signal inside of base station propagation delay time, but for CoMP system, owing to needing to transmit data/dispatch in the cooperation set eNB of different location, excessive propagation delay time is restricted making the performance gain of CoMP, and this point proposes requirement to signaling transmission system during networking.
Terminal to the measurement of channel information mainly based on CSI-RS, for the possible position of CSI-RS in LTE frame structure of different antennae port number, add that the cycle information that these positions may occur forms a CSI-RS configuration, to each UE, base station high-level signaling notifies that its prepares to select which configuration to supply terminal to carry out channel measurement.The CSI-RS reference symbol transmitting site of this community of base station arrangements and cycle, and configuring condition is sent to corresponding terminal by high-level signaling, corresponding terminal is gone forward side by side according to corresponding configuration location CSI-RS reference symbol the channel estimating of line correlation.Configuring the different cycles can corresponding different channel variation speed, the port that each cell configuration is different can avoid interference each other in order to try, and the transmission can cut off the antenna port that the generation of other communities is disturbed, thus reach the object better measuring channel.
For this working method, in former working version, owing to only considering the situation of this transmitting antenna port in community, faced by intra-cell users quantity also more limited, than be easier to user classify determine occur cycle.But under the mode of operation of CoMP, signal launch point wants the total user in facing cooperation region, and user will measure the whole signal launch points in collaboration region, the channel measurement burden caused thus.In a community, such as there is the user of fast change of channel, be configured with the CSI-RS in 5ms cycle, and other signal launch points are all users at a slow speed, all be configured with the CSI-RS cycle of 80ms, and under CoMP pattern, because this user needs the channel measuring all signal launch points, therefore all signal launch points all need the CSI-RS configuring the 5ms cycle, and simultaneously owing to needing the number of measuring-signal launch point also more than originally under CoMP pattern, such as measure 3 neighbor cells simultaneously, there are 3 sectors each community, distribute under each sector 5-6 high power/low-power RRH and Microcell, the signal launch point number progression that needs will be caused to measure increases.
Terminal is operationally waited needs the signal launch point in CoMP collaboration region to carry out channel measurement, due to signal launch point Numerous, the antenna port number of each signal launch point also may be more, and the CSI-RS of system is limited, need to ensure that the ageing and all signal launch points of covering exist certain difficulty simultaneously.
In sum, under existing CoMP mode of operation, there is CSI-RS anxiety, and due to CSI-RS be the resource that make use of PDSCH, the CSI-RS of high density distribution result also in the decline of PDSCH utilance simultaneously.
Summary of the invention
The invention provides a kind of channel measuring method of LTE system, with the problem of CSI-RS anxiety under the existing CoMP pattern solved, improve the resource utilization of PDSCH.
The invention discloses a kind of channel measuring method of LTE system, the method is applicable under multipoint cooperative CoMP mode of operation, and the method comprises:
Base station is that the signal launch point in a CoMP marks off a reference symbol put area in Physical Downlink Shared Channel PDSCH, in described reference symbol put area, arrange multiple reference symbol;
In described reference symbol put area, base station is that in described CoMP, each signal launch point sets a resources pattern with mark; By the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal;
Terminal, according to the positional information of reference symbol put area in PDSCH, utilizes the reference symbol on described reference symbol put area to carry out channel measurement to each signal launch point;
Terminal, according to the channel measurement of each signal launch point, is chosen and is met pre-conditioned resources pattern, by the identification feedback of selected resources pattern to base station;
Base station, according to the mark of the resources pattern of terminal feedback, is searched corresponding signal launch point, described signal launch point is used channel condition information measurement pilot frequency CSI-RS carry out channel measurement.
In the above-mentioned methods, described reference symbol put area is discrete distribution on the frequency domain of whole PDSCH, or on the frequency domain of part PDSCH integrated distribution;
Wherein, described reference symbol put area comprises one or more basic mapping block, and a basic mapping block is made up of all or part of resource particle RE of one or more Physical Resource Block PRB.
In the above-mentioned methods, described base station is that signal launch point in a CoMP marks off a reference symbol put area and comprises in PDSCH:
When adjacent base station sends the PDSCH of same frequency,
The reference symbol put area that base station divides is positioned at the common factor of the idle PDSCH of Zhong Ge base station, CoMP collaboration region;
Or first base station arranges the transfer of data of basic mapping block, then arrange the transfer of data of PDSCH.
In the above-mentioned methods, described base station be in described CoMP each signal launch point set one with mark resources pattern comprise:
In described reference symbol put area, the number of the corresponding RE of each signal launch point is identical; Wherein,
A RE in a corresponding described basic mapping block of signal launch point;
Or, the multiple RE in a corresponding described basic mapping block of signal launch point;
Or the multiple RE in the corresponding described basic mapping block of multiple signal launch point, are distinguished by specific coded system between different signal launch points.
In the above-mentioned methods, when there is the RE do not taken by any signal launch point in described reference symbol put area, the interference that described RE causes signal launch point in CoMP collaboration region for the signal launch point measured outside CoMP collaboration region;
Or,
When there is the RE for certain allocated resource configuration mode is special in described reference symbol put area, the interference that described RE causes signal launch point in CoMP collaboration region for the signal launch point measured outside CoMP collaboration region.
It is in the above-mentioned methods, described that by the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal to comprise:
By the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal by physical downlink control channel PDCCH or high-level signaling;
Or the positional information in PDSCH sends to terminal by PDCCH or high-level signaling by the parameter of the resources pattern of each signal launch point and described reference symbol put area.
In the above-mentioned methods, describedly terminal is sent to comprise by PDCCH or high-level signaling:
In described PDCCH or high-level signaling, specific bit group is used to indicate described reference symbol put area.
In the above-mentioned methods, choose described in and meet pre-conditioned resources pattern and comprise:
Terminal, according to the data received on the RE that each resources pattern is corresponding, calculates the signal to noise ratio on RE corresponding to each resources pattern, chooses the resources pattern that wherein signal to noise ratio is greater than designated value, and to the mark of these resources pattern of base station feedback.
In the above-mentioned methods, described base station be in described CoMP each signal launch point set one with mark resources pattern comprise:
Described base station is according to after long-time data statistics, the threshold level of any one terminal under the channel quality that there are the multiple signal launch points corresponding to different resource configuration mode is lower than described base station, and when the set of the Serving cell that the terminal of described multiple signal launch point is connected respectively does not overlap
Described channel quality uses identical resources pattern lower than multiple signal launch points of the threshold level of any one terminal under described base station.
In the above-mentioned methods, described channel quality uses identical resources pattern to comprise lower than multiple signal launch points of the threshold level of any one terminal under described base station:
When described terminal is to when using the unlike signal launch point of same asset configuration mode described in base station feedback,
Different signal launch points is distinguished in different service cells corresponding to each terminal.
In sum, the present invention by dividing reference symbol put area freely in PDSCH region, the RE that reference symbol put area occupies can set according to actual conditions, thus reaches the target that the signal launch point holding more more number in a subframe carries out measuring; In addition when this block reference symbol put area of division, the actual conditions of business datum can be considered flexibly, reduce the impact on business.And by the one_to_one corresponding of launch point and resources pattern, by adopting the means such as the configuration of identical RE number to decrease configuration information transmission capacity required for system, also decrease the information feedback amount of terminal simultaneously.
Accompanying drawing explanation
Fig. 1 is the flow chart of channel measuring method in a kind of LTE system in the present invention;
Fig. 2 is the structural representation of a kind of basic mapping block in the present invention;
Fig. 3 is the schematic diagram using PDCCH to indicate reference symbol put area in the present invention;
Fig. 4 is the schematic diagram of reference symbol put area in two subframes in the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The invention discloses channel measuring method in a kind of LTE system, the method is applicable in multipoint cooperative CoMP mode of operation.Fig. 1 is the flow chart of channel measuring method in a kind of LTE system in the present invention; As shown in Figure 1,
Step 101, base station is that the signal launch point in a CoMP marks off a reference symbol put area in Physical Downlink Shared Channel PDSCH, in described reference symbol put area, arrange multiple reference symbol.
Step 102, in described reference symbol put area, base station is that in described CoMP, each signal launch point sets a resources pattern with mark; By the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal.
Step 103, terminal, according to the positional information of reference symbol put area in PDSCH, utilizes the reference symbol on described reference symbol put area to carry out channel measurement to each signal launch point.
Step 104, terminal, according to the channel measurement of each signal launch point, is chosen and is met pre-conditioned resources pattern, by the identification feedback of selected resources pattern to base station.
Step 105, base station, according to the mark of the resources pattern of terminal feedback, is searched corresponding signal launch point, described signal launch point is used channel condition information measurement pilot frequency CSI-RS carry out channel measurement.
In flow chart as shown in Figure 1, in a step 101, base station is that the signal launch point in a CoMP collaboration region marks off a reference symbol put area in PDSCH, be specially: base station is according to the number of signal launch point in affiliated CoMP collaboration region and actual conditions, one piece of appropriate area is marked off as reference symbol put area in the PDSCH of free time, wherein, described reference symbol put area comprises one or more basic mapping block, a basic mapping block is made up of all or part of RE of one or more PRB, the channel situation that base station is measured according to actual needs chooses the number of basic mapping block.Described reference symbol put area can discrete distribution on the frequency domain of whole PDSCH, or can on the frequency domain of part PDSCH integrated distribution.
In described reference symbol put area, multiple reference symbol is set, be specially: in the basic mapping block in described reference symbol put area, for different resources pattern, corresponding RE places reference symbol, and described reference symbol is for measuring the channel quality of unlike signal launch point.
Fig. 2 is the structural representation of a kind of basic mapping block in the present invention; In this embodiment, described basic mapping block is made up of the frequency domain width of a PRB and the corresponding time domain width that marks off; As shown in Figure 2, idle data subcarrier in described basic mapping block from time domain to frequency domain number consecutively, is obtained corresponding No. 0 RE ~ No. 119 RE totally 120 RE resources by base station.
In described reference symbol put area, base station is that all signal launch points in described CoMP set unique resources pattern.Wherein, described resources pattern is specially: the one-to-one relationship in signal launch point and described basic mapping block between idle RE.Wherein, described resources pattern has unique mark.In an embodiment of the present invention, the resources pattern that a signal launch point is corresponding unique, the mark of described resources pattern can carry out number consecutively by corresponding RE.
In described reference symbol put area, the number of the corresponding subcarrier of each signal launch point is identical; Wherein, a RE in a corresponding described basic mapping block of signal launch point; Or, the multiple RE in a corresponding described basic mapping block of signal launch point; Or the multiple RE in the corresponding described basic mapping block of multiple signal launch point, are distinguished by specific coded system between different signal launch points.
In an embodiment of the present invention, a signal launch point is by different resources pattern corresponding a RE, the different RE that different signal launch points is corresponding.If the 1st signal launch point is by the 1st resources pattern, corresponding No. 0 RE, maps successively, and n-signal launch point passes through N resource distribution module, corresponding n-1 RE.
In another embodiment of the invention, two subcarriers that a signal launch point is corresponding adjacent; If the 1st signal launch point is by the 1st resources pattern, corresponding No. 0 and No. 1 RE; 2nd signal launch point passes through the 2nd resources pattern, corresponding No. 2 and 3 sub carriers; Map successively, n-signal launch point passes through N resource distribution module, corresponding No. 2*n-2 and 2*n-1 sub carriers.
In other a kind of embodiments of the present invention, two subcarriers that two signal launch points are corresponding adjacent, and use the mode of orthogonal coding to distinguish different resources pattern, wherein, use the configuration of the corresponding low sequence number of+1+1, use the configuration of the corresponding high sequence number of+1-1.If the 1st signal launch point is by corresponding 0 sub carriers of the 1st resources pattern and 1 sub carriers, 2nd signal launch point is by corresponding 0 sub carriers of the 2nd resources pattern and 1 sub carriers, wherein corresponding 1st resources pattern of+1+1, corresponding 2nd resources pattern of+1-1.Receiving terminal independently can recover the signal of each launch point by the orthogonal merging mode of correspondence.Data on the RE that various resources pattern is corresponding should by time-division/frequency division/code grading mode is separated and is used for channel measurement.
Base station is that in described CoMP, each signal launch point sets unique resources pattern, by the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal, or the parameter of the resources pattern of each signal launch point and described reference symbol put area can be sent to terminal at the positional information in PDSCH.Wherein, terminal can be sent to by PDCCH or high-level signaling.
In an embodiment of the present invention, for the basic mapping block shown in Fig. 2, have 50 signal launch points in a CoMP, every 2 the adjacent RE of base station sets are a resources pattern, a corresponding signal launch point.Namely the 1st signal launch point is by No. 0 RE and No. 1 RE in the corresponding basic mapping block of the 1st resources pattern; 2nd signal launch point is by No. 2 RE and No. 3 RE in the corresponding basic mapping block of the 2nd resources pattern; N-th signal launch point is by the 2n-1 RE in the corresponding basic mapping block of the n-th resources pattern and 2n RE; 50th signal launch point is by No. 99 RE and No. 100 RE in the corresponding basic mapping block of the 50th resources pattern; The maximum of n is the total number of signal launch point, and the minimum value of n is 1.In addition, the 2m-1 RE corresponding to m resources pattern and 2m RE, 50<m≤60, for measuring the interference that the extra-regional signal launch point of CoMP causes the signal launch point in CoMP region.
When described resources pattern is sent to terminal by base station, only can send the parameter 2 of described resources pattern; Terminal, according to the parameter 2 of described resources pattern, knows the RE numbering shared by each resources pattern.Such operation can save the volume of transmitted data of corresponding PDCCH or high-level signaling.
Terminal measures the channel quality of different signal launch points according to described resources pattern on different RE, as tested corresponding signal to noise ratio.
The measurement result after channel measurement is carried out according to by different resource configuration mode, after long data statistics, choose successively and meet pre-conditioned resources pattern, resources pattern as corresponding successively from high to low in foundation signal to noise ratio, by the identification feedback of selected resources pattern to base station.Base station can get respective signal launch point according to the mark of described resources pattern.
The resources pattern of each signal launch point or its parameter and the positional information of described reference symbol put area in PDSCH are sent to terminal by PDCCH by base station.In an embodiment of the present invention, base station is by arranging a specific Radio Network Temporary Identifier RNTI, and the corresponding virtual terminal of described RNTI, is used to indicate the positional information of the reference symbol put area marked off in PDSCH clear area; On the Downlink Control Information DCI carried, a specific bit group is selected to be used to indicate the purposes of described reference symbol put area thereon.All terminals in this CoMP region can obtain the positional information of resources pattern on corresponding PDSCH by intercepting this DCI information, and in described DCI, place the parameter information of described resources pattern.
Fig. 3 is the schematic diagram using PDCCH to indicate reference symbol put area in the present invention, as shown in Figure 3, and base station sets virtual terminal; In PDCCH, by the DCI message corresponding to described virtual terminal, the positional information of the reference symbol put area indicating described virtual terminal to divide on PDSCH, and the reference symbol put area marked off described in instruction on certain specific bit position of described DCI carries out the reference symbol needed for channel measurement for placing each signal launch point in CoMP collaboration region.
Each terminal, by intercepting the virtual terminal that in this PDCCH, a specific RNTI is corresponding, obtains resources pattern and the positional information of described reference symbol put area in PDSCH of each signal launch point in the DCI carried.
Because the symbolic number of PDCCH can change, and the number of signal launch point may be less than the idle sub-carrier number in basic mapping block, the situation of the subcarrier do not taken by any signal launch point namely existed in described reference symbol put area; The then interference that signal launch point in CoMP collaboration region caused for the signal launch point measured outside CoMP collaboration region of described subcarrier.In addition, also may exist, the situation being used for the special subcarrier of certain allocated resource configuration mode is there is, the interference that described subcarrier causes signal launch point in CoMP collaboration region for the signal launch point measured outside CoMP collaboration region in described reference symbol put area.
Fig. 4 is the schematic diagram of reference symbol put area in two subframes in the present invention; As shown in Figure 4, carry out in the process of dispatching at use PDCCH, the Indication message of the position comprising multiple basic mapping block may be there is, because the dispatch situation of each subframe of terminal is not identical, by the dynamic change of measured zone, the object measuring whole frequency domain can be reached.As shown in Figure 4, in the subframe that former and later two are adjacent, the frequency domain resource that the position of described basic mapping block occupies is different, when the long characteristic of channel of measurement, can reach the object measuring whole frequency domain.
Terminal is according to the data of the upper reception of corresponding RE of the corresponding in each subframe each PRB of each resources pattern, after adding up after a while, the data that can obtain sufficient density, to calculate the long-time characteristic of channel of each resources pattern, are chosen and are identified the influential resources pattern of this terminal and feed back to base station.
When measuring in a community, may occur that adjacent base station sends the situation of the PDSCH of same frequency, then the reference symbol put area of division is positioned at the common factor of the idle PDSCH of Zhong Ge base station, CoMP collaboration region by base station; Or first base station arranges the transfer of data of basic mapping block, then arrange the transfer of data of PDSCH.
In addition, due to the signal launch point Numerous in a CoMP, when base station is added up through long term data, after long-time data statistics is carried out in base station, if there is the threshold level of channel quality lower than any one terminal of described base station of the multiple signal launch points corresponding to different sub carrier, and when the set of the Serving cell that the terminal of described multiple signal launch point is connected respectively does not overlap, namely described multiple signal launch point always can not be detected by any terminal simultaneously and the terminal that these two signal launch points can be detected respectively the set of Serving cell that connects when also never overlapping, then described channel quality uses identical resources pattern lower than multiple signal launch points of the threshold level of any one terminal.When the mark of terminal to report resources pattern time, different signal launch points is distinguished in the different service cells corresponding to each terminal.Namely the mark of this signal launch point is uniquely determined in conjunction with the Serving cell that this terminal is corresponding.For preventing actual environment from changing, the signal launch point of reusing should regularly retest, and causes confusion to verify the signal launch point of reusing resources pattern still can not be received simultaneously along each beam direction.
In an embodiment of the present invention, terminal is according to the data received on the corresponding RE of each resources pattern, calculate the signal to noise ratio on each signal launch point, choose the resources pattern that wherein signal to noise ratio is greater than designated value, after measuring, obtain the identification feedback of the resources pattern or described resources pattern that signal to noise ratio is greater than designated value to base station.Wherein, described designated value sets according to the actual disposition situation of base station, does not limit at this.In an embodiment of the present invention, described designated value can set for benchmark adds 3dB skew with the maximum signal to noise ratio received.In another embodiment, described designated value is the outer interference power of set detected is benchmark, and search noise acoustic ratio is greater than the launch point of a certain fixed value, and wherein said fixed value sets, as 3db according to information actual conditions.
In another embodiment of the invention, by the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal by high-level signaling.Be specially: the resources pattern of each signal launch point is carried in base station information at high-level signaling and the positional information of reference symbol put area on PDSCH marked off.In order to reduce the transinformation of resources pattern in high-level signaling, take identical RE number of resources and well-regulated placement by the resources pattern of independent signal launch point each in described reference symbol put area, and by described rule announcement terminal or arrange in advance.
Such as, in described reference symbol put area, in described basic mapping block, each signal launch point frequency domain occupies 1 subcarrier, time domain occupies 1 symbol, and by distributing from small to large; Corresponding diagram 2, can be expressed as, corresponding 0 sub carriers of the 1st signal launch point, corresponding 1 sub carriers of the 2nd signal launch point.Parameter (1,1) in described rule is sent to terminal or arranges in advance.It is corresponding with between RE resource that terminal can carry out each signal launch point according to described rule, described RE resource tested the channel quality of corresponding signal launch point, obtains the long term signal characteristics of each signal launch point.
Use high-level signaling notifies, can not reach the effect of every subframe change, but be made reference the adjustment of symbol put area by the interval of long period, also can reach the similar effect measuring whole frequency domain.
Terminal according to base station announcement resources pattern, in the reference symbol put area of described PDSCH to each signal launch point carry out channel measurement operation.Through long data statistics, choose the influential signal launch point of this terminal from all signal launch points described CoMP, the corresponding signal to noise ratio of reference symbol that namely this signal launch point is launched is greater than designated value.Terminal by corresponding parameter feedback to base station.
In sum, the present invention by dividing reference symbol put area freely in PDSCH region, the RE that reference symbol put area occupies can set according to actual conditions, thus reaches the target that the signal launch point holding more more number in a subframe carries out measuring; In addition when this block reference symbol put area of division, the actual conditions of business datum can be considered flexibly, reduce the impact on business.And by the one_to_one corresponding of launch point and resources pattern, by adopting the means such as same sub-carrier number configuration, decreasing the configuration information transmission capacity required for system, also decreasing the information feedback amount of terminal simultaneously.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a channel measuring method for LTE system, is characterized in that, the method is applicable under multipoint cooperative CoMP mode of operation, and the method comprises:
Base station is that the signal launch point in a CoMP marks off a reference symbol put area in Physical Downlink Shared Channel PDSCH, in described reference symbol put area, arrange multiple reference symbol;
In described reference symbol put area, base station is that in described CoMP, each signal launch point sets a resources pattern with mark; By the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal;
Terminal, according to the positional information of reference symbol put area in PDSCH, utilizes the reference symbol on described reference symbol put area to carry out channel measurement to each signal launch point;
Terminal, according to the channel measurement of each signal launch point, is chosen and is met pre-conditioned resources pattern, by the identification feedback of selected resources pattern to base station;
Base station, according to the mark of the resources pattern of terminal feedback, is searched corresponding signal launch point, described signal launch point is used channel condition information measurement pilot frequency CSI-RS carry out channel measurement.
2. method according to claim 1, is characterized in that,
Described reference symbol put area is discrete distribution on the frequency domain of whole PDSCH, or on the frequency domain of part PDSCH integrated distribution;
Wherein, described reference symbol put area comprises one or more basic mapping block, and a basic mapping block is made up of all or part of resource particle RE of one or more Physical Resource Block PRB.
3. according to the method described in claim 2, it is characterized in that, described base station is that the signal launch point in a CoMP marks off a reference symbol put area and comprises in PDSCH:
When adjacent base station sends the PDSCH of same frequency,
The reference symbol put area that base station divides is positioned at the common factor of the idle PDSCH of Zhong Ge base station, CoMP collaboration region;
Or first base station arranges the transfer of data of described basic mapping block, then arranges the transfer of data of PDSCH.
4. method according to claim 2, is characterized in that, described base station be in described CoMP each signal launch point set one with mark resources pattern comprise:
In described reference symbol put area, the number of the corresponding RE of each signal launch point is identical; Wherein,
A RE in a corresponding described basic mapping block of signal launch point;
Or, the multiple RE in a corresponding described basic mapping block of signal launch point;
Or the multiple RE in the corresponding described basic mapping block of multiple signal launch point, are distinguished by specific coded system between different signal launch points.
5. method according to claim 4, is characterized in that,
When there is the RE do not taken by any signal launch point in described reference symbol put area, the interference that described RE causes signal launch point in CoMP collaboration region for the signal launch point measured outside CoMP collaboration region;
Or,
When there is the RE for certain allocated resource configuration mode is special in described reference symbol put area, the interference that described RE causes signal launch point in CoMP collaboration region for the signal launch point measured outside CoMP collaboration region.
6. method according to claim 1, is characterized in that, described by the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal to comprise:
By the resources pattern of each signal launch point and described reference symbol put area, the positional information in PDSCH sends to terminal by physical downlink control channel PDCCH or high-level signaling;
Or the positional information in PDSCH sends to terminal by PDCCH or high-level signaling by the parameter of the resources pattern of each signal launch point and described reference symbol put area.
7. method according to claim 6, is characterized in that, describedly sends to terminal to comprise by PDCCH or high-level signaling:
In described PDCCH or high-level signaling, specific bit group is used to indicate described reference symbol put area.
8. method according to claim 1, is characterized in that, described in choose and meet pre-conditioned resources pattern and comprise:
Terminal, according to the data received on the RE that each resources pattern is corresponding, calculates the signal to noise ratio on RE corresponding to each resources pattern, chooses the resources pattern that wherein signal to noise ratio is greater than designated value, and to the mark of these resources pattern of base station feedback.
9., according to the method in claim 1 ~ 8 described in any, it is characterized in that, described base station be in described CoMP each signal launch point set one with mark resources pattern comprise:
Described base station is according to after long-time data statistics, the threshold level of any one terminal under the channel quality that there are the multiple signal launch points corresponding to different resource configuration mode is lower than described base station, and when the set of the Serving cell that the terminal of described multiple signal launch point is connected respectively does not overlap
Described channel quality uses identical resources pattern lower than multiple signal launch points of the threshold level of any one terminal under described base station.
10. method according to claim 9, is characterized in that, described channel quality uses identical resources pattern to comprise lower than multiple signal launch points of the threshold level of any one terminal under described base station:
When described terminal is to when using the unlike signal launch point of same asset configuration mode described in base station feedback,
Different signal launch points is distinguished in different service cells corresponding to each terminal.
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| CN103581996B (en) * | 2012-07-20 | 2017-04-12 | 华为技术有限公司 | Method, terminal and base station for reporting measuring results |
| CN103974315B (en) * | 2013-02-05 | 2018-01-19 | 电信科学技术研究院 | Three dimensional channel measures resource distribution and mass measuring method and equipment |
| CN104283820A (en) * | 2013-07-03 | 2015-01-14 | 普天信息技术研究院有限公司 | Method for determining signal to noise ratio (SNR) of communication system |
| KR102048232B1 (en) * | 2015-04-10 | 2019-11-25 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Channel measurement method, base station and UE |
| CN106559112B (en) * | 2015-09-24 | 2020-04-21 | 中国移动通信集团公司 | Channel information feedback method, resource allocation method, device, base station and user equipment |
| CN107181578B (en) | 2016-03-10 | 2020-01-14 | 电信科学技术研究院 | Reference signal mapping method and device |
| US10069613B2 (en) * | 2016-04-01 | 2018-09-04 | Motorola Mobility Llc | Method and apparatus for scheduling uplink transmissions with reduced latency |
| US20230136240A1 (en) * | 2020-03-12 | 2023-05-04 | Lenovo (Beijing) Limited | Channel state information reference signal resource pairs |
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