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WO2013010504A1 - 一种获取信道状态信息的方法及装置 - Google Patents

一种获取信道状态信息的方法及装置 Download PDF

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Publication number
WO2013010504A1
WO2013010504A1 PCT/CN2012/078971 CN2012078971W WO2013010504A1 WO 2013010504 A1 WO2013010504 A1 WO 2013010504A1 CN 2012078971 W CN2012078971 W CN 2012078971W WO 2013010504 A1 WO2013010504 A1 WO 2013010504A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
cells
preset
frequency point
channel state
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/078971
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English (en)
French (fr)
Inventor
周明宇
周永行
任晓涛
夏亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP12814376.5A priority Critical patent/EP2736287B1/en
Publication of WO2013010504A1 publication Critical patent/WO2013010504A1/zh
Priority to US14/158,048 priority patent/US9503336B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0204Channel estimation of multiple channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • H04L25/0228Channel estimation using sounding signals with direct estimation from sounding signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/50Testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035Resource allocation in a cooperative multipoint environment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for acquiring channel state information.
  • a CoMP Coordinatd Multiple Point Transmission/Reception
  • UE User Equipment
  • the quality of the received signal thereby improving the efficiency of the transmission.
  • the technology that multiple cells can simultaneously serve the same UE refers to the manner in which all the signals received by the UE improve the quality of the signal received by the UE.
  • the cell responsible for scheduling needs to know the CSI of the wireless channel between the plurality of cells and the UE.
  • the RS information includes an RS sequence, a time and a frequency of the RS transmission
  • the UE measures the RS sent by the multiple cells according to the received RS information, and feeds the measurement result to the responsible scheduling.
  • Cell in this way, the cell responsible for scheduling can know more CS I of the wireless channel between the cell and the UE.
  • Embodiments of the present invention provide a method and apparatus for acquiring channel state information, which can reduce signaling overhead and feedback overhead, and reduce the complexity of UE operation.
  • a method for obtaining channel state information includes:
  • Any one of the at least two cells sends the reference signal RS preset transmission time and the RS preset frequency point to the user equipment UE;
  • Each of the at least two cells sends an RS to the UE by using different RS resources, so that the UE follows the The RS presets the sending time and the RS preset frequency point, and sequentially measures the received RS on the different RS resources;
  • the UE And receiving, by the UE, a measurement result, where the measurement result includes channel state information CS I between the cell or cell combination of the at least two cells and the UE.
  • a method for obtaining channel state information includes:
  • the measurement result includes CS I between the cell or cell combination of the at least two cells and the UE.
  • a sending unit configured to send the reference signal RS preset sending time and the RS preset frequency point to the UE; the reference information sending unit, configured to use the RS preset sending time and the RS preset frequency point to pass the RS resource to Sending, by the UE, the RS, so that the UE, according to the RS preset sending time and the RS preset frequency point, sequentially measures the received RS on the different RS resources; at least two serving the UE
  • the RS resources used by the cells are different RS resources when the RSs are sent to the UE according to the RS preset transmission time and the RS preset frequency point.
  • a receiving unit configured to receive a measurement result sent by the UE, where the measurement result includes channel state information CSI between the cell or cell combination of the at least two cells and the UE.
  • An apparatus for obtaining channel state information includes:
  • a first receiving unit configured to receive an RS preset sending time and an RS preset frequency point sent by any one of the at least two cells
  • the receiving reference signal unit is configured to receive the RS sent by using different RS resources, and sequentially measure the RS according to the RS preset sending time and the RS preset frequency point on the different RS resources. Obtaining CSI between the at least two cells and the UE;
  • a sending unit configured to send a measurement result to any one of the at least two cells, where the measurement result includes CSI between the cell or cell combination of the at least two cells and the UE.
  • the reference signal RS preset transmission time and the RS preset frequency point are sent to the user equipment UE by using any one of the at least two cells, at least two Each cell or cell combination in the cell sends an RS to the UE according to the RS preset transmission time and the RS preset frequency point, so that the UE sends the time and the preset according to the RS.
  • the solution provided by the embodiment of the present invention can send only one RS information to the UE, and the UE can measure only one RS and feed back an RS corresponding to the complexity of the UE.
  • CS I which can reduce signaling overhead and feedback overhead, and reduce the complexity of UE work.
  • FIG. 1 is a flowchart of a method for acquiring a channel state according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of another method for acquiring a channel state according to Embodiment 1 of the present invention
  • Figure 1 is a block diagram of an apparatus for acquiring a channel state according to Embodiment 1 of the present invention
  • Figure 5 is a block diagram of an apparatus for acquiring a channel state according to Embodiment 1 of the present invention
  • FIG. 6 is a schematic diagram of a format of an RS preset transmission time and an RS preset frequency point according to Embodiment 2 of the present invention
  • FIG. 7 is a schematic diagram of sending RSs in different cells on a first resource according to Embodiment 2 of the present invention
  • FIG. 8 is a schematic diagram of sending RSs in different cells on a second resource according to Embodiment 2 of the present invention
  • FIG. A block diagram of an apparatus for acquiring a channel state is provided in Example 2.
  • FIG. 10 is a block diagram of another apparatus for acquiring a channel state according to Embodiment 1 of the present invention.
  • At least two cells serving the user equipment UE are at least two, and each of the at least two cells corresponds to one base station or a transceiver node, and receives or sends a signal.
  • the reference signal RS resource is in units of time TTI Transmi ss ion Time Interva l , transmission time interval, and the frequency is PRB (Phys ica l Resource Block) Unit
  • 1 TTI has a length of 1 ms
  • 1 TTI includes 14 symbols
  • PRB is used in frequency
  • 1 PRB is 12 subcarriers within 1 TTI, where each subcarrier on each symbol is called 1 RE (Resource Element), that is, 1 PRB includes (12* 14 ) REs, and each RE corresponds to a certain time in units of symbols and a certain frequency in subcarriers.
  • the format of the RS preset transmission time and the RS preset frequency point is (K, L), that is, the RS is in the K-th subcarrier and the L-th symbol in a certain PRB, which is the signal format.
  • the transmission time of the RE, the number of REs, and the location of the RE are sent to the UE, and the location of the RE can be represented by (K, L), for example, K is 0, 1 11 ; L is 0, 1 13 .
  • An embodiment of the present invention provides a method for acquiring a channel state. As shown in FIG. 1, the method includes:
  • Step 101 The at least one of the at least two cells sends the reference signal RS preset transmission time and the RS preset frequency point to the UE.
  • Step 102 Each cell or cell combination of the at least two cells sends an RS to the UE by using different RS resources according to the RS preset sending time and the RS preset frequency point, so that the UE is used. And measuring, according to the RS preset sending time and the RS preset frequency point, sequentially measuring the received RS on different RS resources;
  • the same RS sequence information needs to be acquired, and the same RS sequence information is sent to the UE, and the RS sequence information is used to generate the RS;
  • the method for obtaining the same RS sequence information may be as follows: Obtaining the same RS sequence information from the serving cell of the UE, where the serving cell is a cell that sends signaling to the UE through the physical downlink control channel PDCCH; or, The interface between the at least two cells acquires the same RS sequence information; or the at least two cells determine respective identical RS sequence information.
  • Step 103 Receive a measurement result sent by the UE, where the measurement result includes channel state information CSI between the cell or cell combination of the at least two cells and the UE.
  • the CSI is the CSI obtained after filtering.
  • the executor of the method may be any one of at least two cells, specifically, a base station or a transceiver node in the cell.
  • Another embodiment of the present invention provides a method for acquiring a channel state. As shown in FIG. 2, the method includes:
  • Step 201 Receive an RS preset sending time and an RS preset frequency point sent by any one of the at least two cells.
  • Step 202 Receive the RS sent by using different RS resources, and measure the RS according to the RS preset sending time and the RS preset frequency point on the different RS resources, to obtain the at least CSI between two cells and the UE;
  • the RS sequence information is used to generate the RS
  • Step 203 Send a measurement result to any one of the at least two cells, where the measurement The quantity result includes CSI between the cell or cell combination of the at least two cells and the UE.
  • the execution body of the method is a UE.
  • the method for acquiring the channel state information provided by the embodiment of the present invention sends the reference signal RS preset transmission time and the RS preset frequency point to the user equipment UE, in at least two cells, by using any one of the at least two cells.
  • each of the cells or the cell combination sends an RS to the UE by using different RS resources, so that the UE presets the transmission time according to the RS and the RS.
  • Presetting a frequency point sequentially measuring, by each of the at least two cells, an RS that is sent by using a different RS resource, and then receiving a measurement result sent by the UE, where the measurement result includes the at least two Channel state information CSI between the cell or cell combination and the UE in the cell.
  • the CS I of the radio channel between the multiple cells and the UE is obtained, the signaling overhead and the feedback overhead are increased, and the complexity of the UE is increased.
  • the scheme sends the information of one RS to the UE, so that the UE can measure only one RS and feed back the CS I corresponding to one RS. This can reduce signaling overhead and feedback overhead, and reduce the complexity of UE operation.
  • An embodiment of the present invention provides an apparatus for acquiring a channel state, where the apparatus is used to perform the method of the embodiment of FIG. 1 , where the apparatus is any one of at least two cells served by the UE, and specifically, may be a base station in the cell. Or a transceiver node, as shown in FIG. 3, the device includes: a sending unit 301, a reference information sending unit 302, and a receiving unit 303.
  • the sending unit 301 is configured to send the reference signal RS preset sending time and the RS preset frequency point to
  • an execution unit is configured to acquire the same RS sequence information, and send the same RS sequence information to the UE, where the RS sequence information is used to generate the RS; specifically, acquiring the same RS
  • the same RS sequence information may be obtained from the serving cell of the UE, where the serving cell is a cell that sends signaling to the UE through the physical downlink control channel PDCCH; or, between the at least two cells
  • the interface acquires the same RS sequence information; or, the at least two cells determine respective identical RS sequence information;
  • the reference information sending unit 302 is configured to send an RS to the UE by using an RS resource according to the RS preset sending time and the RS preset frequency point, so that the UE presets a sending time according to the RS and the RS presets a frequency point, and sequentially measures, by each of the at least two cells, an RS that is sent by using different RS resources; and at least two cells serving the UE are sent according to the RS preset.
  • the reference information sending unit is further configured to: preset the sending time and the RS preset according to the RS in the first cell. Sending, by the frequency point, the RS resource of the RS to the UE, not sending the RS according to the RS preset sending time and the RS preset frequency point, where the device where the reference information sending unit belongs The cell is different from the first cell, where the first cell is any one of the at least two cells;
  • the reference information sending unit is further configured to: in the RS resource that the first cell sends an RS to the UE according to the RS preset sending time and the RS preset frequency point, in the RS preset sending time and Not transmitting a signal on the RS preset frequency point;
  • the calculating unit is configured to use the RS preset transmission time and the RS preset frequency point number according to all RS preset transmission times and the total number of RS preset frequency points, the RS resource number, the cell identifier, and the Calculating the total number of cells in the RS, the partial parameters in the random sequence, or all the parameters;
  • a setting unit configured to set a filter coefficient to 0, a filter signal sending unit, configured to send the filter coefficient and a filtering period to the UE, so that the UE obtains the at least two obtained by measuring the RS The CSI between any one of the cells or the combination of cells and the UE is filtered.
  • the receiving unit 303 is configured to receive a measurement result sent by the UE, where the measurement result includes a channel state information CSI between the cell or cell combination of the at least two cells and the UE.
  • An embodiment of the present invention provides an apparatus for acquiring a channel state, where the apparatus is used to implement FIG. 2
  • the device may be a UE.
  • the device includes: a first receiving unit 401, a receiving reference signal unit 402, and a sending unit 403.
  • the first receiving unit 401 is configured to receive an RS preset sending time and an RS preset frequency point sent by any one of the at least two cells.
  • the second receiving unit is configured to receive the same RS sequence information that is sent by any one of the at least two cells, where the RS sequence information is used to generate the RS.
  • the receiving reference signal unit 402 is configured to receive the RS sent by using different RS resources, and measure the RS according to the RS preset sending time and the RS preset frequency point on the different RS resources. Obtaining CSI between the at least two cells and the UE;
  • receiving the filtered signal unit including receiving a filter coefficient and a filtering period sent by any one of the at least two cells, and obtaining the at least two cells obtained after measuring the RS
  • the CSI between the cell or cell combination and the UE is filtered, and the filter coefficient is 0.
  • the sending unit 403 is configured to send a measurement result to any one of the at least two cells, where the measurement result includes CSI between the cell or cell combination of the at least two cells and the UE.
  • the device for acquiring the channel state information is sent by the sending unit to the user equipment UE by using the preset sending time of the reference signal RS and the RS preset frequency point, and the reference signal sending unit presets the sending time according to the RS. And transmitting, by the RS, a RS, to the UE, by using a different RS resource, and then receiving, by the receiving unit, the measurement result sent by the UE, where the measurement result includes any one of the at least two cells or a cell combination Channel state information CSI between the UEs.
  • the CSI of the radio channel between the multiple cells and the UE is obtained, the signaling overhead and the feedback overhead are increased, and the complexity of the UE is increased.
  • the UE can measure only one RS and feed back the CSI corresponding to one RS. This can reduce signaling overhead and feedback overhead, and reduce the complexity of UE operation.
  • Example 2 An embodiment of the present invention provides a method for acquiring channel state information. As shown in FIG. 5, the method includes:
  • Step 501 The at least one of the at least two cells sends the reference signal RS preset transmission time and the RS preset frequency point to the user equipment UE.
  • Time and frequency points can also be called time-frequency grid points, and RS resources are TTI in time.
  • the transmission time interval is a unit, and the frequency is in the range of PRB (Phys ica l Resource Block), as shown in Figure 6, the RS preset transmission time and the RS preset frequency point.
  • the format of the signal that is, the format of the signal, the resource for transmitting the RS is TTI in time, the length of one TTI is lms, and one TTI includes 14 symbols, as shown by the horizontal axis L in FIG. 6, the vertical axis K Indicates a PRB, and one PRB is 12 subcarriers within one TTI, where each subcarrier on each symbol is called 1 RE (Resource Element), that is, 1 PRB includes (12*14) REs.
  • the RE transmission time, the number of REs, and the location of the RE are sent to the UE, and the location of the RE may be represented by (K, L), for example, K is 0, 1...11; L is 0, 1 13 .
  • the information of the set of available resources of the RS includes the configuration of the transmission time of the RS, the transmission period of the RS, and the offset of the RS, as shown in the following table:
  • the RS transmission time configuration c SI - RS is 36, in the 35-74 line of the correspondence table, it can be found that the RS period is 40 TTIs, and the RS offset is 1, indicating that the RS is numbered 1, 41. , 81, 121 ... are sent on the TTI.
  • the RS transmission time configuration CSI-RS is 0, indicating that the RS period is 5 TTIs, and the RS offset is 0, that is, the RSs are numbered 0, 5, 10, 15...
  • the TTI is sent, and the PRB that sends the RS is all PRBs.
  • the RS preset sending time and the RS preset frequency point may be sent to the UE.
  • Any one of the at least two cells may also be a cell combination; the cells are combined into multiple cells, and the cell combination may include any N (N>1) cells of the at least two cells.
  • Step 502 The UE receives an RS preset sending time and an RS preset frequency point sent by any one of the at least two cells.
  • Step 503 the at least one of the at least two cells acquires the same RS sequence information, and sends the same RS sequence information to the UE, where the RS sequence information is used to generate the RS;
  • the RSs sent by each of the at least two cells are generated by a certain sequence.
  • the generating formula of the CSI-RS sequence is
  • c(.) represents a random sequence
  • the characteristics of the sequence are related to the cell identification number (Identity, ID) and the number of the TTI, where m represents the number of the PRB, and N represents the number of the largest PRB in the downlink.
  • the cell generates r (m) of length N according to the above formula, and then maps it to the RE for transmitting the CSI-RS, and transmits it to the UE together with other signals.
  • the cell needs to obtain the cell ID and the TTI number before generating the CSI-RS, and the cell ID and the TTI number belong to the RS sequence related information.
  • each cell has the same characteristics according to the RS preset transmission time and the RS sequence transmitted by the RS preset frequency point, so that the cell ID and the TTI used by each cell for generating the CSI-RS are the same. In this way, the UE only needs to measure the sequence generated according to a set of RS sequence related information.
  • the time and frequency of the transmission are the same as the RS preset transmission time and the RS preset frequency.
  • any one of the at least two cells may acquire the same RS sequence information in any of the following manners:
  • Manner 1 Obtain the same RS sequence information from the serving cell of the UE;
  • CoMP Coordinated Multiple Point transmission/rece tion, ten
  • a cell that transmits signaling to a UE through a PDCCH Physical Downlink Control Channel
  • a serving cell of the UE is usually a UE.
  • the incoming cell, and usually the channel state is optimal; other cells transmitting data to the UE are referred to as coordinated cells; the serving cell and the coordinated cell constitute a cooperative set.
  • the one cell is a serving cell of the UE, and the RS sequence related information sent by the cell to the UE is determined by the cell, for example, the cell ID used in the process of generating the CSI-RS sequence. That is the ID of the cell;
  • the serving cell determines the information about the RS sequence, so that the UE can switch from the state of being served by multiple cells to the state of being served by only one cell, so that the generation of the CS I-RS sequence can be determined.
  • the cell ID used in the process is the ID of the serving cell.
  • Manner 2 Obtain the same RS sequence information by using an interface between the at least two cells; for example, if cell 1 is a serving cell of the UE, the RS sequence related information is determined by the cell 1, and the information is transmitted through the inter-cell interface. For cell 2, it is convenient for cell 2 to use the same RS sequence related information as cell 1. For example, the cell 1 transmits the ID of the cell 1 to the cell 2 through the interface between the cells, and the cell 2 can generate the CSI-RS having the same characteristics as the CSI-RS generated by the cell 1 according to the ID. In addition, the TTI number is usually the same for different cells, so there is no need to pass the interface between cells.
  • each cell is controlled by a base station, and one base station usually controls multiple cells.
  • the interface between the base stations is called an X2 interface
  • the cell 1 is controlled by the base station 1
  • the cell 2 is controlled by the base station 2
  • the base station 1 transmits the ID of the cell 1 to the base station through the interface between the base stations.
  • the cell 2 can generate a CSI-RS having the same characteristics as the CSI-RS generated by the cell 1 according to the ID.
  • the cell 1 is used as the serving cell, and the cell 1 may not be the serving cell, which is different from the first mode.
  • the at least two cells determine respective identical RS sequence information.
  • the information about the RS sequence used by each of the at least two cells is not easily adjusted to be consistent, the information about the RS sequence transmitted by the small-area interface is not easy to implement, and each cell determines its own RS sequence information.
  • each cell determines its own RS sequence information.
  • an inter-base station interface a type of inter-cell interface
  • its capacity is small, and people generally do not want to transmit RS sequence related information on the interface. Therefore, the RS sequence related information used by each cell is not easily adjusted to be consistent, so
  • the cell 1 and the cell 2 respectively determine the RS sequence related information, and generate an RS according to the respective RS sequence related information.
  • Step 504 The UE receives the same RS sequence information that is sent by any one of the at least two cells, where the RS sequence information is used to generate the RS.
  • the RS sequence information is used to measure the received RS in the UE, so that any one of the at least two cells generates the RS by using the RS sequence corresponding to the RS sequence information, and the wireless channel undergoes the process of transmitting to the UE.
  • the channel after receiving the UE, uses the RS sequence corresponding to the same RS sequence information to perform convolution or other similar operation on the received signal that has undergone the wireless channel, so that the CSI of the wireless channel can be known.
  • Step 505 Each cell or cell combination of the at least two cells sends an RS to the UE by using different RS resources according to the RS preset sending time and the RS preset frequency point, so that the UE is used. And measuring the received RS in different RS resources according to the RS preset sending time and the RS preset frequency point;
  • the RS may be sent to the UE on the RS resource, which may be one cell, or may be multiple cells, that is, a combination of cells.
  • the following description sends the UE to the UE according to each of the at least two cells.
  • the cell combination sends the RS two transmission modes to the UE for description.
  • each of the at least two cells sends an RS to the UE.
  • the cell sends the RS at the illustrated position, that is, (9, 5) and (9, 6)
  • the RS is sent on the RE
  • the two REs of the PRB are the preset transmission time of the RS of the PRB and the preset frequency of the RS.
  • the preset transmission time of the RS and the preset frequency of the RS may also be referred to as RS. pattern.
  • the number of REs included in one RS pattern is generally related to the number of antenna ports transmitting the RS, for example, in FIG.
  • the RS pattern includes two REs, corresponding to one or two antenna ports for transmitting RS scenarios, and two antenna ports can multiplex the two REs by means of code division.
  • each cell sends an RS: the first cell sends an RS to the UE according to the RS preset sending time and the RS preset frequency point, and the at least two The cell in the cell other than the first cell does not send the RS to the UE according to the preset transmission time of the RS and the preset frequency of the RS, where the first cell is the at least Any one of the two cells;
  • the cell 1 when there are two cells serving the UE, on the first resource, the cell 1 sends an RS to the UE according to the RS preset transmission time and the RS preset frequency point, and the cell 2 does not follow the RS preset.
  • the sending time and the RS preset frequency point are sent to the UE by the RS; on the second resource, the cell 2 sends an RS to the UE according to the RS preset sending time and the RS preset frequency point, and the cell 1 does not And sending the RS to the UE according to the RS preset sending time and the RS preset frequency point.
  • Cell 2 does not transmit RS according to the RS preset transmission time and the RS preset frequency point
  • the RS sent by the cell 1 can be reduced at this time.
  • the interference is favorable for the UE to measure the RS of the cell 1; however, the RS preset transmission time and the RS preset frequency point on the first resource of the cell 2 cannot be used by other UEs of the cell 2 to measure the CSI, when the number of UEs is compared In many cases, this may cause a problem of insufficient capacity of the CSI-RS. Therefore, the cell 2 may also transmit the RS according to another RS pattern, so that other UEs other than the UE measure CSI.
  • the cell 2 does not send the RS according to the RS preset sending time and the RS preset frequency point, and includes two modes:
  • Manner 1 The RS is sent to the UE according to an RS pattern different from the pattern of the RS, where the pattern of the RS specifically refers to the RS preset sending time and the RS preset frequency point;
  • the RS preset transmission time sent by the cell 1 and the cell 2 is different from the RS preset frequency point (the pattern of the RS), for example, in the TTI numbered 0, 10, 20...
  • the pattern of the RS transmitted by the cell 1 is (9, 5) and (9, 6)
  • the pattern of the RS transmitted by the cell 2 is (3, 5) and (3, 6).
  • the pattern of the RS transmitted by the cell 1 is (4, 5) and (4, 6) two REs
  • the pattern of the RS transmitted by the cell 2 is (9, 5) and (9, 6)
  • the two REs that is, the pattern used by the cell 1 to transmit the RS, are hopped on the first resource and the second resource.
  • other UEs may detect the RS sent by the cell 2 on the two resources (3, 5) and (3, 6) on the first resource, or may be in the (4, 5) and (4, on the second resource. 6)
  • the RS sent by the cell 1 is detected on the two REs.
  • Manner 2 The cell other than the first cell in the at least two cells does not send a signal on the RS preset sending time and the RS preset frequency point.
  • the cell 1 sends an RS to the UE according to the RS preset sending time and the RS preset frequency point, and the cell 2 is in the The RS preset transmission time and the RS preset frequency point do not send a signal; on the second resource, the cell 2 sends the RS preset transmission time and the RS preset frequency point to the UE according to the RS RS, the cell 1 does not send a signal on the RS preset sending time and the RS preset frequency point.
  • the cell 2 does not transmit a signal on the pattern of the RS transmitted by the cell 1, so that the cell 2 does not interfere with the signal transmitted by the cell 1 and facilitates the UE to measure the RS transmitted by the cell 1.
  • the cell 1 does not transmit a signal on the pattern of the cell 2 transmitting the RS, so that the cell 1 does not interfere with the signal transmitted by the cell 2, and the UE is allowed to measure the RS transmitted by the cell 2.
  • the pattern of the RS transmitted by the cell 1 and the cell 2 is as shown in FIG. 7, and for the same PRB, as shown in FIG. 7A)
  • the pattern of the RS transmitted by the cell 1 is (9, 5) and (9, 6), and as shown in FIG. 7B)
  • the pattern of the RS transmitted by the cell 2 is (9, 7) and (9, 8).
  • Two REs, and the cell 2 does not transmit a signal on the pattern corresponding to the RS transmitted by the cell 1, that is, the cell 2 does not transmit signals on the two REs (9, 5) and (9, 6), as shown in FIG. 7B) Show.
  • the pattern of the RS transmitted by the cell 1 and the cell 2 is as shown in FIG. 8, for the same PRB, as shown in the figure. 8 A ) shows that the pattern of the RS transmitted by the cell 1 is (9, 7) and (9, 8) two REs, as shown in Fig. 8 B), the pattern of the RS transmitted by the cell 2 is (9, 5) and ( 9, 6) two REs, and the cell 1 does not transmit a signal on the pattern corresponding to the RS transmitted by the cell 2, that is, the cell 1 does not transmit signals on the two REs (9, 5) and (9, 6), as shown in the figure. 8 B ) is shown.
  • the cell 1 transmits the RS on the TTI numbered 5 due to the (9, 5) and the 5th and 6th symbols (9, 6)
  • the two REs do not need to transmit signals, and the cell can add other signals than the two REs (9, 5) and (9, 6) on the 5th and 6th symbols.
  • the cells 2 transmits the RS on the TTI numbered 0 since when the cell 2 transmits the RS on the TTI numbered 0, the signals are not transmitted on the two REs (9, 5) and (9, 6), so the signals of the REs other than the two REs are The power is higher.
  • the power of the other signals ensures that the transmit power of the symbol when transmitting the RS on the TTI numbered 5 is equal to the transmit power of the symbol when the RS is transmitted on the TTI numbered 0.
  • the cell combination sends the RS to the UE through different RS resources; for example, on the TTI (the first resource) numbered 0, 10, 20..., the pattern of the RS sent by the cell 1 is ( 9, 5) and (9, 6) two REs, cell 2 does not send RS on these two REs; on TTI (2th resource) numbered 5, 15, 25 ..., cell 1 Cooperating with cell 2 to transmit RSs on two REs of patterns (9, 5) and (9, 6), where the combination of cells represents cell 1 and cell 2;
  • the number of REs included in one RS pattern is generally related to the number of antenna ports transmitting the RS.
  • the total number of antenna ports used is the same as the number of ports when a single cell sends an RS to the UE.
  • the sum of the number of antenna ports used by the cell 1 and the cell 2 is also 4, and the transmit port of the cell 1 is 0 and RS with antenna port 1 and cell 2 transmit RS with antenna port 2 and antenna port 3, so that no additional signaling can be sent to the UE to notify the antenna port of the change.
  • the number of the pattern of the RS used by each cell to transmit the RS to the UE is based on the total number of all RS patterns, the resource number, the cell ID, the total number of cells transmitting RSs to the UE according to the RS pattern, some parameters in the random sequence, or all
  • the parameter is calculated.
  • the pattern used by the cell to transmit the RS is related to the total number of all RS patterns, so as to conveniently limit the number of the RS pattern to the correct range; and the pattern used by the cell to transmit the RS is related to the resource number, then
  • the cell can be implemented to send RSs according to different RS patterns on different resources;
  • the pattern used by the cell to transmit the R S is related to the cell ID, so that the RS can be sent by using different RS patterns on the same resource and in different cells;
  • the pattern used by the cell to transmit the RS is related to the total number of cells that send the RS to the UE according to the RS pattern, which facilitates limiting the number of the RS pattern to some RS patterns of all RS patterns, thereby facilitating the UE to measure only a specific number of The RS sent by the cell;
  • the pattern used by the cell to transmit the RS is related to the random sequence, which helps to randomize the interference received by the RS received by the UE, because the interference received by the neighboring cell and the local cell when using different time-frequency grid points is not Similarly, if the neighboring cell and the cell use the same time-frequency grid point, the interference will always be large. If the time-frequency grid point used by the transmitting RS is controlled by a random sequence, different RSs can be used at different times. The time-frequency grid point transmits the RS, so that the interference received by the local cell when transmitting the RS is randomized.
  • the pattern of the RS (RS preset transmission time and RS preset frequency point) used by each cell to transmit the RS to the UE may be numbered, as shown in the following table, corresponding to the case where the A antenna port transmits the RS.
  • each cell sends a pattern of the RS used by the RS to the UE for numbering, which may be adopted.
  • Pattern_ID (Cell_ID+N_TTI) mod M; where, Pattern_ID indicates the RS preset transmission time and the RS preset frequency point number of the RS, and Cell_ID indicates the identifier of the cell that sends the RS.
  • the ITTI indicates the number of the transmission time interval TTI of the RS, or the period number of the RS, mod indicates the modulo operation, and the value of M is preset in each cell and the UE.
  • N_TTI 1
  • Pattern_ID (Cell_ID + N_TTI + c (N_TTI)) mod lcell; where, Pattern_ID represents the RS preset transmission time and the RS preset frequency point number of the RS, and Cell_ID indicates that the RS is sent.
  • the identifier of the cell ITTI indicates the number of the transmission time interval TTI for transmitting the RS, or the period number of the RS to be transmitted, mod indicates a modulo operation, lcell indicates the number of cells transmitting the RS, and c (ITTI) indicates a random sequence.
  • Pattern_ID (Cell_ID + LlTTI / (KxP_FB)") mod N_cel 1; where, Pattern_ID indicates the RS preset transmission time and the number of the RS preset frequency point for transmitting the RS, and Cell_ID indicates the cell that transmits the RS. ID, ITTI indicates the number of the transmission time interval TTI for transmitting the RS, or the period number of the RS, P-FB indicates the period during which the UE feeds back the CS I; K indicates a natural number, and L. indicates rounding down Mod represents modulo operation, and I ce 11 represents the number of cells transmitting the RS, for example, lcell may represent the total number of cells that send RSs to the UE according to the RS pattern;
  • LlTTI /(KxP_FB) is incremented by 1 every KxP_FB TTI, it means that the RS number of the RS pattern is changed once every time the UE measures the RS measured by K times.
  • the advantage of this is that the UE can perform feedback on the RS measurement sent by one cell after multiple times, thereby enhancing the accuracy of the UE measurement.
  • Pattern_ID (Cell_ID+ LN-TTI /KxN.rankJ) modN.cell; where, Pattern_ID indicates the RS preset transmission time and the RS preset frequency point number of the RS, and Cell_ID indicates the cell that sends the RS. ID, ITTI indicates the number of the transmission time interval TTI for transmitting the RS, K indicates the natural number, Irank indicates the number of cycles required for the UE to feed back the RS for the first rank indication RI, and [.” indicates rounding down, lcell Indicates the number of cells that send the RS, for example, lcell represents the total number of cells that send RSs to the UE according to the RS pattern;
  • the UE is required to feed back multiple CSIs, including CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), and RI ( Rank Indicator, The rank indication), where the CQI carries the Modulation and Coding Scheme (MCS) recommended by the UE, where the PMI and the RI represent the CSI of the spatial dimension, and usually the feedback period of the RI is The longest, therefore, the UE feeds back an RI, and the cell can obtain a complete CSI;
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator, The rank indication
  • MCS Modulation and Coding Scheme
  • LlTTI I KxN_rank is incremented by 1 every Kxlrank, it means that the number of the RS pattern changes every time the UE feeds K times.
  • the advantage of this is that after the UE measures the RS sent by one cell, the UE can obtain complete information (including CQI, PMI, RI) by multiple times, thereby facilitating cell scheduling to the UE.
  • Step 506 The UE receives the RS that is sent by using different RS resources, and sequentially measures the RS according to the RS preset sending time and the RS preset frequency point on the different RS resources. Obtaining CSI between the at least two cells and the UE;
  • the UE After receiving the RS, the UE obtains the CSI between the cell and the UE according to the received RS preset transmission time, the RS preset frequency point, and the RS sequence information, and obtains the CSI between the cell and the UE.
  • the UE needs to measure the RS sent by each cell, which increases the complexity of the UE.
  • the UE only needs to measure the preset transmission time according to the RS and the preset frequency of the RS.
  • the RS that is, only needs to measure one RS, thereby reducing the complexity of the UE.
  • the UE may be configured to measure the RSs sent by the cell 1 or 2 in a period of five TTIs by using the foregoing method, that is, at numbers 0, 5, and 15 Measuring the RS sent by the cell on the TTI of the ..., that is, the UE is numbered 0.
  • the RS measured on the TTI (first resource) of 10, 20, ... is transmitted by the cell 1, and the UE is on the TTI (the second resource) numbered 5, 15, 25, ....
  • the measured RS is sent by cell 2.
  • the cell responsible for scheduling can learn the CSI corresponding to the cell 1 and the cell 2 by means of a wired connection, etc., and can perform CoMP scheduling on the UE;
  • the UE may be configured to measure by using 10 TTIs, that is, the RSs sent by the cell are measured on the TTIs of numbers 0, 10, 20, .
  • the RSs received by the UE on these TTIs are all transmitted by the cell 1, and at this time, filtering can be used to obtain better measurement accuracy, that is, the setting k is not zero.
  • the first UE corresponding to the CSI of the multiple cells receives the primary RS sent by the cell every 5 TTIs, and does not need to know that the second UE corresponding to the CSI of the multiple cells only needs to
  • the 10 TTIs measure the RSs sent by the cell once, that is, the RSs measured by the second UE are only a subset of the RSs transmitted by the cell.
  • 3GPP 3rd generation partnership project, third-generation partner TIC'J
  • Release 11 R11 for short
  • Release 10 R10 for short
  • the R10-capable UE does not need to know the UEs of multiple cells corresponding to CS I, because the system of R1 1 cannot receive the signals when it sends multiple cell cooperative scheduling signals to it.
  • the UE of the R10 can still be normally operated by the present invention; and the UE supporting the R11 can also be regarded as a UE that needs to learn the CSI corresponding to multiple cells, and the UE supporting the R11 is enabled by using the present invention. Get the benefits of CoMP technology.
  • Step 507 Set a filter coefficient to 0 in any one of the at least two cells, and send a filter coefficient and a filtering period to the UE, so that the UE obtains the at least two cells obtained by measuring the RS. Filtering the CSI between the cell or the cell combination and the UE; specifically, sending the filter coefficient to the UE to be set to 0, so that after the nth measurement, the filtered result is the nth time. Measured measurement.
  • the UE in order for the UE to measure the RS transmitted by each cell to obtain better precision, the UE is often used to control the filtering of multiple measurement results by a coefficient FilterCoefficient, and the cell sends a coefficient FilterCoefficient to the UE, and the UE measures the RS multiple times. After that, the result after filtering is calculated by the following formula, and the value is fed back to the d and the area.
  • F n ⁇ -a)-F n _ ⁇ aM n ⁇
  • Mn the nth measurement value
  • Fn the result of the refilter after the nth measurement
  • F0 is set to M1
  • a l/2(k/4)
  • k the filter coefficient F i 1 terCoeffi c ient.
  • the advantage of the setting is that the UE is prevented from filtering the RSs sent by multiple cells, which leads to inaccurate estimation.
  • the UE is configured to measure the RS pattern numbered 1, while in the first TTI and the second TTI, the measured RS is small If the filtering parameter k of the UE is not 0, then according to the above formula, the CSI of the UE in the second TTI feedback also reflects the CSI obtained by the first TTI measurement, so After receiving the CSI fed back by the UE, the CSI is inaccurate as the CSI of the cell 2; and if the filtering parameter k is set to 0, according to the above formula, the CSI of the UE in the second TTI feedback only reflects the first The CSI obtained by the two TTIs, that is, the CSI fed back by the UE in the second TTI reflects only the CSI of the cell 2. Therefore, if the cell receives the CSI fed back by the UE, the CSI can be used as the CSI
  • the transmission filtering period it is for indicating the period of the RS used for filtering by the UE.
  • the UE measures the period of the RS sent by the cell to be 5, and the TTIs are numbered 0, 10, 20, .
  • the (single resource) measures the RS transmitted by the cell 1, and the TTI (the second resource) numbered 5, 15, 25, ... measures the RS transmitted by the cell 2. If the filter coefficient of the UE is configured to be 0, the CSI fed back by the UE is a measurement value of the unfiltered wave, and the value of the feedback value is not high because the signal is not filtered.
  • the filtering period may be 10 to the UE, so that the UE measures and filters only on the TTI with the interval of 10.
  • the UE measures multiple values on the TTI (1st resource) numbered 0, 10, 20..., applying the formula 1 - ⁇ + ⁇ ⁇ ⁇ to these values, for example, feedback on the number 10
  • the result is Fn-1, then the value measured on the TTI numbered 20 is Mn, and the feedback result is 7 " ⁇ 1 - ⁇ ' ⁇ , since the RS measurements used for filtering are measured.
  • the result of the filtering obtained by the RS transmitted by the cell 1 reflects the CSI of the cell 1 and the UE, and is similar for the cell 2.
  • Step 508 The UE receives a filter coefficient and a filtering period sent by any one of the at least two cells, and performs a cell or a cell combination and a cell combination of the at least two cells obtained after measuring the RS. Filtering CSI between UEs;
  • Step 505 The UE sends a measurement result to any one of the at least two cells, where the measurement result includes CSI between the cell or cell combination of the at least two cells and the UE.
  • the UE needs to measure the RS sent by each cell, and feeds the obtained CSI between each cell and the UE to each cell, which brings a large feedback overhead, and is related to the prior art.
  • the UE in the UE cannot feed back the measurement result of the CS I corresponding to the multiple cells, and the cell in charge of the scheduling cannot obtain the CSI between the cells and the UE, so that reasonable coordination cannot be achieved between the cells.
  • the scheme UE only needs to feed back the CSI corresponding to one RS, which reduces the overhead of feedback, so that the cell responsible for scheduling can obtain multiple cells from the feedback of UEs that cannot feed back CSI between multiple cells and UEs.
  • the CSI between UEs facilitates reasonable coordination.
  • Step 511 The cell of any one of the at least two cells receives the measurement result sent by the UE, where the measurement result includes a channel state between the cell or cell combination of the at least two cells and the UE.
  • Information CSI is a channel state between the cell or cell combination of the at least two cells and the UE.
  • the performing entity that receives the measurement result sent by the UE may be the serving cell of the UE, or may be the cell in the coordinated set of the UE.
  • the flexible cell can be selected to send a signal to the UE to improve the transmission efficiency. For example, the cell corresponding to the CSI with the highest transmission efficiency is selected. UE service.
  • the cell responsible for scheduling knows the CSI between the cell combination and the UE, the cell can be flexibly scheduled according to these CSIs. For example, when the joint CSI between the cell 1 and the cell 2 and the UE can bring higher transmission efficiency, At the same time, cell 1 and cell 2 are scheduled to serve the UE.
  • a method for acquiring channel state information is provided by the embodiment of the present invention, by receiving an RS preset transmission time and an RS preset frequency point, which are sent by any one of the at least two cells, and then receiving any cell or cell combination through different And the RS is sent by the RS resource, and the RS is measured according to the RS preset sending time and the RS preset frequency point on the different RS resources, to obtain the at least two cells or a cell combination.
  • CSI with the UE, and the measurement result The signaling is sent to any one of the at least two cells, and the CSI of the radio channel between the multiple cells and the UE is obtained in the prior art, which brings more signaling overhead and feedback overhead, and increases the working of the UE.
  • the solution provided by the embodiment of the present invention can transmit the information of one RS to the UE, so that the UE can measure only one RS and feed back the CSI corresponding to one RS, which can reduce signaling overhead and feedback overhead, and reduce UE working. the complexity.
  • An embodiment of the present invention provides an apparatus for acquiring channel state information, where the apparatus is used in any one of at least two cells in the embodiment of FIG. 5, where the apparatus is any one of at least two cells served by the UE.
  • a cell specifically, may be a base station or a transceiver node in a cell.
  • the device includes: a sending unit 901, an executing unit 902, a calculating unit 903, a reference information sending unit 904, a setting unit 905, and a filtering signal.
  • the transmitting unit 906 is a receiving unit 907.
  • the sending unit 901 is configured to send the reference signal RS preset sending time and the RS preset frequency point to
  • the time and frequency points can also be called time-frequency grid points.
  • the RS resources are in units of TTI Transmission Time Interval (transmission time interval), and the frequency is in units of PRB (Physical Resource Block).
  • the length of the TTI is lms, and one TTI includes 14 symbols; one PRB is 12 subcarriers within one TTI, and each subcarrier on each symbol becomes 1 RE (Resource Element), that is, 1
  • Each PRB includes (12*14) REs, each RE corresponds to a certain time in units of symbols and a certain frequency point in units of subcarriers, specifically, the transmission time of RE, the number of REs, RE
  • the format is sent to the UE.
  • the format of the RE can be represented by (K, L), K is the PRB, and the value is 0, 1...11; L is the TTI, and the value is 0, 1... 13, where the RS is preset.
  • the time and RS preset frequency points may also be referred to as RS pattern information.
  • the executing unit 902 is configured to obtain the same RS sequence information, and send the same RS sequence information to the UE, where the RS sequence information is used to generate the RS;
  • the RSs sent by each of the at least two cells are generated by a certain sequence, for example, in the LTE-Advanced system (LTE-Advanced) system, the CSI-RS sequence is generated.
  • LTE-Advanced LTE-Advanced
  • c(.) represents a random sequence
  • the characteristics of the sequence are related to the cell identification number (Identity, ID) and the number of the TTI, where m represents the number of the PRB, and N represents the number of the largest PRB in the downlink.
  • the cell After the cell generates r (m) of length N according to the above formula, it is mapped to the RE for transmitting the CSI-RS, and is sent to the UE together with other signals;
  • the time and frequency of the transmission are the same as the RS preset transmission time and the RS preset frequency.
  • the performing unit 902 is specifically configured to: acquire the same RS sequence information from the serving cell of the UE, where the serving cell is a cell that sends signaling to the UE by using a physical downlink control channel PDCCH; or, by using the at least two The interface between the cells acquires the same RS sequence information; or the at least two cells determine the same RS sequence information.
  • a cell that transmits signaling to a UE through a PDCCH Physical Downlink Control Channel
  • the serving cell of the UE is usually a cell accessed by the UE, and the channel state is optimal; other cells that transmit data to the UE are referred to as coordinated cells; the serving cell and the coordinated cell constitute a cooperative set;
  • the RS preset sending time may be Numbered with the RS preset frequency.
  • the calculating unit 903 is configured to send, according to all the RS preset transmission times and the total number of RS preset frequency points, the RS resource number, the cell identifier, to the UE, the number of the RS preset transmission time and the RS preset frequency point. The total number of cells in the RS, some parameters in the random sequence, or all parameters are calculated.
  • the Pattern_ID indicates the RS preset transmission time and the RS preset frequency point number of the RS; the Cell_ID indicates the identifier of the cell that sends the RS; the ITTI indicates the number of the transmission time interval TTI that sends the RS, or sends The period number of the RS; mod indicates the modulo operation; the value of M is preset on both sides of the cell and the UE; lcell indicates the number of cells transmitting the RS, and the value of the lcell is preset on the cell and the UE side, so that Signaling is required, or each cell sends a signaling to the UE to notify the value, so that the value can be configured more flexibly; c(N_TTI) represents a random sequence, and the sequence can be preset on the UE and the cell side; P_FB indicates the UE feedback The period of the CSI; K represents a natural number; [.” represents rounding down; Irank represents the number of periods in which the UE sends the RS required to feed back a
  • the reference information sending unit 904 is configured to send, by using the RS resource, an RS to the UE according to the RS preset sending time and the RS preset frequency point, so that the UE presets the sending time according to the RS and the The RS presets a frequency point, and sequentially measures the received RS on the different RS resources; at least two cells serving the UE, according to the RS preset sending time and the RS preset frequency point When the UE sends an RS, the RS resources used are different RS resources.
  • the reference information sending unit is further configured to: in the first cell, according to the RS preset sending time and the RS pre-pre And transmitting, by the frequency point, the RS resource of the RS to the UE, not sending the RS to the UE according to the RS preset sending time and the RS preset frequency point, where the device where the reference information sending unit is located belongs
  • the cell is different from the first cell, and the first cell is any one of the at least two cells;
  • the reference information sending unit is further configured to: send, according to the RS preset transmission time and the RS preset frequency point, an RS resource that is sent to the UE according to the RS preset transmission No signal is sent at the time and the RS preset frequency point. It should be noted that the reference signal sending unit of different cells may simultaneously send the RS to the UE through the RS resource.
  • Setting unit 905 configured to set a filter coefficient to 0;
  • the filter coefficient is set to 0.
  • the result of the re-filtering is the measured value of the nth measurement.
  • the transmission filtering period is to indicate the period of the RS used for filtering by the UE.
  • the filtering signal sending unit 906 is configured to send the filter coefficient and the filtering period to the UE, so that the UE compares any one of the at least two cells obtained by measuring the RS to the UE and the UE The CS I is filtered between.
  • the receiving unit 907 is configured to receive the measurement result sent by the UE, where the measurement result includes channel state information CS I between the cell or cell combination of the at least two cells and the UE.
  • the channel state information CS I between any one of the at least two cells and the cell combination and the UE is a result of filtering after the UE measures the RS.
  • the device for acquiring the channel state information is sent by the sending unit to the user equipment UE by using the preset sending time of the reference signal RS and the RS preset frequency point, and the reference signal sending unit presets the sending time according to the RS. And transmitting, by the RS, a RS, to the UE, by using a different RS resource, and then receiving, by the receiving unit, a measurement result sent by the UE, where the measurement result includes any one of the at least two cells or a cell combination Channel state information CS I between the UEs.
  • the CS I of the radio channel between the multiple cells and the UE is obtained, the signaling overhead and the feedback overhead are increased, and the complexity of the UE operation is increased.
  • the scheme sends the information of one RS to the UE, so that the UE can measure only one RS and feed back the CS I corresponding to one RS, which can reduce signaling overhead and feedback overhead, and reduce the complexity of the UE work.
  • the embodiment of the present invention further provides an apparatus for acquiring channel state information, where the apparatus is used in the UE side of the embodiment of FIG. 5, and the apparatus may be a UE.
  • the apparatus includes: a first receiving unit 1001.
  • the second receiving unit 1002 receives the reference signal unit 1003 and receives the filter.
  • the first receiving unit 1001 is configured to receive an RS preset sending time and an RS preset frequency point that are sent by any one of the at least two cells.
  • the second receiving unit 1002 is configured to receive the same RS sequence information that is sent by any one of the at least two cells, or the cell sequence information, where the RS sequence information is used to generate the RS;
  • the information is used to measure the received RS in the UE, such that any one of the at least two cells generates an RS by using an RS sequence corresponding to the RS sequence information, and during the process of transmitting to the UE, the wireless channel is experienced, and after receiving the UE,
  • the CSI of the wireless channel can be known by convolving the received signal subjected to the wireless channel or the like with the RS sequence corresponding to the same RS sequence information.
  • the receiving reference signal unit 1003 is configured to receive the RS sent by using different RS resources, and sequentially, according to the RS preset sending time and the RS preset frequency point, on the different RS resources. RS, obtaining CSI between the at least two cells and the UE;
  • the UE After receiving the RS, the UE obtains the CSI between the cell and the UE according to the received RS preset transmission time, the RS preset frequency point, and the RS sequence information, and obtains the CSI between the cell and the UE.
  • the UE needs to measure the RS sent by each cell, which increases the complexity of the UE.
  • the UE only needs to measure the preset transmission time according to the RS and the preset frequency of the RS. Said RS, that is, only one RS needs to be measured, thereby reducing the complexity of the UE.
  • Receiving the filtered signal unit 1004 comprising: receiving a filter coefficient and a filtering period sent by any one of the at least two cells, and combining any one of the at least two cells or the cell combination obtained after measuring the RS Filtering between CSIs between the UEs;
  • the filter coefficient is 0, and the measured RS is filtered according to the received filter coefficient filterable period. After the nth measurement, the filtered result is the measured value of the nth measurement.
  • the sending unit 1005 is configured to send a measurement result to any one of the at least two cells, where the measurement result includes any one of the at least two cells or a cell combination and a Said CS I between UEs.
  • An apparatus for acquiring channel state information is configured to receive, by using a first receiving unit, an RS preset transmission time and an RS preset frequency point, which are sent by any one of the at least two cells, and then receive a reference.
  • the signal unit receives the RS sent by using different RS resources, and measures the RS according to the RS preset sending time and the RS preset frequency point on the different RS resources, to obtain the at least two
  • the CS I between the cells and the UE uses a transmitting unit to transmit the measurement result to any one of the at least two cells.
  • the CS I of the radio channel between the multiple cells and the UE is obtained, the signaling overhead and the feedback overhead are increased, and the complexity of the UE operation is increased.
  • the UE sends an RS message, so that the UE can measure only one RS and feed back a CS I corresponding to the RS. This can reduce signaling overhead and feedback overhead, and reduce the complexity of UE operation.

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Abstract

本发明公开了一种获取信道状态信息的方法及装置,涉及通信技术领域,可以减少信令开销和反馈开销,降低UE工作的复杂度。本发明实施例提供的方案通过至少两个小区中的任一个小区将参考信号RS预设发送时间和RS预设频点发送给用户设备UE,至少两个小区中的每一个小区或者小区组合按照所述RS预设发送时间和所述RS预设频点,通过不同的RS资源向所述UE发送RS,接收所述UE发送的测量结果,所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所述UE之间的信道状态信息CSI。本发明实施例提供的方案适合在需要获取多个小区与UE之间的CSI时使用。

Description

一种获取信道状态信息的方法及装置 本申请要求于 2011 年 7 月 20 日提交中国专利局、 申请号为 201110203846.1、 发明名称为 "一种获取信道状态信息的方法及装置", 及 于 2011年 9月 15日提交中国专利局、 申请号为 201110273699.5、发明名称 为 "一种获取信道状态信息的方法及装置" 的中国专利申请的优先权, 其 全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域, 尤其涉及一种获取信道状态信息的方法及 装置。 背景 在无线通信系统中, 采用 CoMP ( Coordinated Multiple Point transmission/reception, 协作多点发送 /接收)的技术使得多个小区可以 同时为同一个 UE服务, 从而可以提高 UE (User Equipment, 用户设备)接 收到的信号的质量, 从而提高传输的效率, 这里, 多个小区可以同时为同 一个 UE服务的技术是指所有通过多个小区的协作来提升 UE收到的信号的 质量的方式。
在 CoMP系统中, 为了使同时为一个 UE服务的多个小区之间能进行合 理的协作,则负责调度的小区需要获知多个小区与 UE之间的无线信道的 CSI
( Channel State Information, 信道状态信息)。 在现有技术中, 由于信 号的配置信息通常由负责调度的小区发给 UE, 因此各个小区向负责调度的 小区发送各自的 RS信息, 然后负责调度的小区向 UE发送各个小区的 RS
(Reference Signal, 参考信号) 的信息, RS信息包括 RS序列、 RS发送 的时刻和频点等, UE根据接收到的 RS信息, 测量多个小区发送的 RS, 并 将测量结果反馈给负责调度的小区, 这样, 负责调度的小区就可以获知多 个小区与 UE之间的无线信道的 CS I。
然而, 采用现有技术在获得多个小区与 UE之间的无线信道的 CS I时, 会带来较多的信令开销和反馈开销, 增加 UE工作的复杂度。 发明内容 本发明的实施例提供一种获取信道状态信息的方法及装置, 可以减少 信令开销和反馈开销, 降低 UE工作的复杂度。
为达到上述目的, 本发明的实施例采用如下技术方案:
一种获取信道状态信息的方法, 包括:
至少两个小区中的任一个小区将参考信号 RS预设发送时间和 RS预设 频点发送给用户设备 UE;
所述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送 时间和所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时间和所述 RS预设频点,依次在所述不同的 RS资 源上测量收到的 RS ;
接收所述 UE发送的测量结果, 所述测量结果包括所述至少两个小区中 任一个小区或者小区组合与所述 UE之间的信道状态信息 CS I。
一种获取信道状态信息的方法, 包括:
接收至少两个小区中的任一个小区发送的 RS预设发送时间和 RS预设 频点;
接收通过不同的 RS资源发送的所述 RS , 并依次在所述不同的 RS资源 上, 按照所述 RS预设发送时间和所述 RS预设频点测量所述 RS , 获得所述 至少两个小区与所述 UE之间的 CS I ;
向所述至少两个小区中的任一个小区发送测量结果, 所述测量结果包 括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CS I。
一种获取信道状态信息的装置, 为用户设备 UE服务的小区至少两个, 所述获取信道状态信息的装置为所述至少两个小区中的任一个小区中的装 置, 包括:
发送单元,用于将参考信号 RS预设发送时间和 RS预设频点发送给 UE; 参考信息发送单元, 用于按照所述 RS预设发送时间和所述 RS预设频 点通过 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时间 和所述 RS预设频点, 依次在所述不同的 RS资源上测量接收到的 RS; 为所 述 UE服务的至少两个小区, 在按照所述 RS预设发送时间和所述 RS预设频 点向所述 UE发送 RS时, 使用的 RS资源为不同的 RS资源;
接收单元, 用于接收所述 UE发送的测量结果, 所述测量结果包括所述 至少两个小区中任一个小区或者小区组合与所述 UE 之间的信道状态信息 CSI。
一种获取信道状态信息的装置, 包括:
第一接收单元, 用于接收至少两个小区中的任一个小区发送的 RS预设 发送时间和 RS预设频点;
接收参考信号单元, 用于接收通过不同的 RS资源发送的所述 RS , 并依 次在所述不同的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设频点 测量所述 RS , 获得所述至少两个小区与所述 UE之间的 CSI ;
发送单元, 用于向所述至少两个小区中的任一个小区发送测量结果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所述 UE 之间的 CSI。
本发明实施例提供的一种获取信道状态信息的方法及装置, 通过至少 两个小区中的任一个小区将参考信号 RS预设发送时间和 RS预设频点发送 给用户设备 UE,至少两个小区中的每一个小区或者小区组合按照所述 RS预 设发送时间和所述 RS预设频点, 通过不同的 RS资源向 UE发送 RS , 以便所 述 UE按照所述 RS预设发送时间和所述 RS预设频点, 依次在不同的 RS资 源上测量接收到的 RS , 然后接收所述 UE发送的测量结果, 所述测量结果包 括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状态 信息 CS I。 与现有技术中在获得多个小区与 UE之间的无线信道的 CSI时, 会带来较多的信令开销和反馈开销, 增加 UE工作的复杂度相比, 本发明实 施例提供的方案通过向 UE发送一个 RS的信息,使得 UE可以只测量一个 RS 并且反馈一个 RS对应的 CS I , 这样可以减少信令开销和反馈开销, 降低 UE 工作的复杂度。 附图简要说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对 实施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员 来讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的 附图。
图 1为本发明实施例 1提供的一种获取信道状态的方法的流程图; 图 2为本发明实施例 1提供的另一种获取信道状态的方法的流程图; 图 3为本发明实施例 1提供的一种获取信道状态的装置的框图; 图 4为本发明实施例 1提供的另一种获取信道状态的装置的框图; 图 5为本发明实施例 2提供的一种获取信道状态的方法的流程图; 图 6为本发明实施例 2提供的 RS预设发送时间和 RS预设频点的格式 的示意图;
图 7为本发明实施例 2提供的在第一资源上不同小区发送 RS的示意图; 图 8为本发明实施例 2提供的在第二资源上不同小区发送 RS的示意图; 图 9为本发明实施例 2提供的一种获取信道状态的装置的框图; 图 10为本发明实施例 1提供的另一种获取信道状态的装置的框图。 实施本发明的方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
需要说明的是, 本发明实施例提供的方案中, 为用户设备 UE服务的小 区为至少两个, 至少两个小区中的每个小区对应一个基站或者收发节点, 接收或者发送信号。
在本发明实施例提供的方案中, 参考信号 RS 资源在时间上以 TTI Transmi s s ion Time Interva l , 传输时间间隔) 为单位, 在频率上以 PRB ( Phys ica l Resource Block ,物理资源块)为单位, 1个 TTI的长度为 lms, 1个 TTI包括 14个符号, 在频率上以 PRB为单位, 1个 PRB为 1个 TTI内 的 12 个子载波, 其中每个符号上的每个子载波称为 1 个 RE ( Resource Element , 资源单元), 即 1个 PRB包括( 12* 14 )个 RE, 每个 RE对应以符 号为单位的某个时间以及以子载波为单位的某个频点, 也可以称为时频格 点, RS预设发送时间和 RS预设频点的格式为(K, L ), 即 RS在某个 PRB中 在第 K个子载波和第 L个符号上, 此即信号的格式。 具体地, 将 RE的发送 时间、 RE的数目, RE的位置发送给 UE, RE的位置可以用 (K, L )表示, 例如: K为 0, 1 11 ; L为 0, 1 13。
实施例 1
本发明实施例提供一种获取信道状态的方法, 如图 1 所示, 该方法包 括:
步骤 101 , 至少两个小区中的任一个小区将参考信号 RS预设发送时间 和 RS预设频点发送给 UE;
步骤 102 , 所述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送时间和所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时间和所述 RS预设频点, 依次在不 同的 RS资源上测量收到的 RS;
进一步地, 在步骤 102之前, 还需要获取相同的 RS序列信息, 并将所 述相同的 RS序列信息发送给所述 UE, 所述 RS序列信息用于生成所述 RS; 其中获取相同的 RS序列信息可以采用以下几种方式: 从所述 UE的服务小 区获取相同的 RS序列信息, 所述服务小区为通过物理下行控制信道 PDCCH 向 UE发送信令的小区; 或者, 通过所述至少两个小区之间的接口获取相同 的 RS序列信息; 或者, 所述至少两个小区确定各自的相同的 RS序列信息。
进一步地, 设置滤波系数为 0, 并向所述 UE发送所述滤波系数和滤波 周期, 以使所述 UE对测量所述 RS获得的所述至少两个小区中任一个小区 或者小区组合与所述 UE之间的 CSI进行滤波。
步骤 103 , 接收所述 UE发送的测量结果, 所述测量结果包括所述至少 两个小区中任一个小区或者小区组合与所述 UE之间的信道状态信息 CSI。
所述 CSI即是经过滤波之后获得的 CSI。
该方法的执行主体可以为至少两个小区中的任一个小区, 具体地, 为 小区中的基站或者收发节点。
本发明实施例提供另一种获取信道状态的方法, 如图 2 所示, 该方法 包括:
步骤 201 , 接收至少两个小区中的任一个小区发送的 RS预设发送时间 和 RS预设频点;
步骤 202 ,接收通过不同的 RS资源发送的所述 RS , 并在所述不同的 RS 资源上, 按照所述 RS预设发送时间和所述 RS预设频点测量所述 RS , 获得 所述至少两个小区与所述 UE之间的 CSI ;
进一步地, 在接收至少两个小区中的任一个小区或者小区组合通过不 同的 RS资源发送的所述 RS之前, 接收所述至少两个小区中的任一个小区 发送的相同的 RS序列信息, 所述 RS序列信息用于生成所述 RS;
进一步地, 在接收至少两个小区中的任一个小区或者小区组合通过不 同的 RS资源发送的所述 RS之后, 接收所述至少两个小区中的任一个小区 发送的滤波系数和滤波周期, 并对测量所述 RS后获得的所述至少两个小区 中任一个小区或者小区组合与所述 UE之间的 CSI进行滤波。
步骤 203 , 向所述至少两个小区中的任一个小区发送测量结果, 所述测 量结果包括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI。
该方法的执行主体为 UE。
本发明实施例提供的一种获取信道状态信息的方法, 通过至少两个小 区中的任一个小区将参考信号 RS预设发送时间和 RS预设频点发送给用户 设备 UE,至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送 时间和所述 RS预设频点, 通过不同的 RS资源向 UE发送 RS , 以便所述 UE 按照所述 RS预设发送时间和所述 RS预设频点, 依次测量所述至少两个小 区中的每一个小区或者小区组合通过不同的 RS资源发送的 RS ,然后接收所 述 UE发送的测量结果, 所述测量结果包括所述至少两个小区中任一个小区 或者小区组合与所述 UE之间的信道状态信息 CSI。 与现有技术中在获得多 个小区与 UE之间的无线信道的 CS I时,会带来较多的信令开销和反馈开销, 增加 UE工作的复杂度相比, 本发明实施例提供的方案通过向 UE发送一个 RS的信息, 使得 UE可以只测量一个 RS并且反馈一个 RS对应的 CS I , 这样 可以减少信令开销和反馈开销, 降低 UE工作的复杂度。
本发明实施例提供一种获取信道状态的装置, 该装置用于执行图 1 实 施例的方法, 该装置为 UE服务的至少两个小区中的任一个小区, 具体的, 可以为小区中的基站或者收发节点, 如图 3 所示, 该装置包括: 发送单元 301 , 参考信息发送单元 302 , 接收单元 303。
发送单元 301 ,用于将参考信号 RS预设发送时间和 RS预设频点发送给
UE;
进一步地, 执行单元, 用于获取相同的 RS序列信息, 并将所述相同的 RS序列信息发送给所述 UE, 所述 RS序列信息用于生成所述 RS; 具体地, 在获取相同的 RS序列信息时, 可以从所述 UE的服务小区获取相同的 RS序 列信息, 所述服务小区为通过物理下行控制信道 PDCCH向 UE发送信令的小 区; 或者, 通过所述至少两个小区之间的接口获取相同的 RS序列信息; 或 者, 所述至少两个小区确定各自的相同的 RS序列信息; 参考信息发送单元 302 ,用于按照所述 RS预设发送时间和所述 RS预设 频点, 通过 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送 时间和所述 RS预设频点, 依次测量所述至少两个小区中的每一个小区或者 小区组合通过不同的 RS资源发送的 RS; 为所述 UE服务的至少两个小区, 在按照所述 RS预设发送时间和所述 RS预设频点向所述 UE发送 RS时, 使 用的 RS资源为不同的 RS资源;
进一步地,当至少两个小区中的每一个小区通过不同的 RS资源发送 RS 时, 所述参考信息发送单元还用于: 在第一小区按照所述 RS预设发送时间 和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 不按照所述 RS预设发 送时间和所述 RS预设频点向所述 UE发送所述 RS , 所述参考信息发送单元 所在的装置所属的小区与所述第一小区是不同的, 所述第一小区为所述至 少两个小区中的任一个小区;
所述参考信息发送单元还用于: 在第一小区按照所述 RS预设发送时间 和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 在所述 RS预设发送时 间和所述 RS预设频点上不发送信号;
进一步地, 计算单元, 用于所述 RS预设发送时间和 RS预设频点的编 号根据所有的 RS预设发送时间和 RS预设频点的总数、 RS资源编号、 小区 标识、 向所述 UE发送 RS的各个小区总数、 随机序列中的部分参数或者全 部参数计算得出;
进一步地, 设置单元, 用于设置滤波系数为 0, 滤波信号发送单元, 用 于向所述 UE发送所述滤波系数和滤波周期, 以使所述 UE对测量所述 RS获 得的所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI进 行滤波。
接收单元 303 , 用于接收所述 UE发送的测量结果, 所述测量结果包括 所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状态信 息 CSI。
本发明实施例提供一种获取信道状态的装置, 该装置用于执行图 2 实 施例的方法, 该装置可以为 UE, 如图 4所示, 该装置包括: 第一接收单元 401 , 接收参考信号单元 402 , 发送单元 403。
第一接收单元 401 , 用于接收至少两个小区中的任一个小区发送的 RS 预设发送时间和 RS预设频点;
进一步地, 第二接收单元, 用于接收所述至少两个小区中的任一个小 区发送的相同的 RS序列信息, 所述 RS序列信息用于生成所述 RS。
接收参考信号单元 402 , 用于接收通过不同的 RS资源发送的所述 RS , 并在所述不同的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设频点 测量所述 RS , 获得所述至少两个小区与所述 UE之间的 CSI ;
进一步地, 在接收到 RS后, 接收滤波信号单元, 包括接收所述至少两 个小区中的任一个小区发送的滤波系数和滤波周期, 并对测量所述 RS后获 得的所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI进 行滤波, 所述滤波系数为 0。
发送单元 403 , 用于向所述至少两个小区中的任一个小区发送测量结 果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所 述 UE之间的 CSI。
本发明实施例提供的一种获取信道状态信息的装置, 通过发送单元将 参考信号 RS预设发送时间和 RS预设频点发送给用户设备 UE, 参考信号发 送单元按照所述 RS预设发送时间和所述 RS预设频点, 通过不同的 RS资源 向 UE发送 RS , 然后接收单元接收所述 UE发送的测量结果, 所述测量结果 包括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状 态信息 CSI。与现有技术中在获得多个小区与 UE之间的无线信道的 CSI时, 会带来较多的信令开销和反馈开销, 增加 UE工作的复杂度相比, 本发明实 施例提供的方案通过向 UE发送一个 RS的信息,使得 UE可以只测量一个 RS 并且反馈一个 RS对应的 CSI , 这样可以减少信令开销和反馈开销, 降低 UE 工作的复杂度。
实施例 2 本发明实施例提供一种获取信道状态信息的方法, 如图 5 所示, 该方 法包括:
步骤 501 , 至少两个小区中的任一个小区将参考信号 RS预设发送时间 和 RS预设频点发送给用户设备 UE;
时间和频点也可以称为时频格点, RS 资源在时间上以 TTI
Transmi s s ion Time Interva l , 传输时间间隔) 为单位, 在频率上以 PRB ( Phys ica l Resource Block, 物理资源块) 为单位, 如图 6所示的 RS预 设发送时间和 RS预设频点的格式, 即信号的格式, 发送 RS的资源在时间 上以 TTI (为单位, 1个 TTI的长度为 lms, 1个 TTI包括 14个符号, 如图 6中以横轴 L表示,纵轴 K表示 PRB, 1个 PRB为 1个 TTI内的 12个子载波, 其中每个符号上的每个子载波称为 1个 RE ( Resource Element ,资源单元), 即 1个 PRB包括( 12*14 ) 个 RE , 具体地, 将 RE的发送时间、 RE的数目, RE的位置发送给 UE, RE的位置可以用(K, L )表示,例如: K为 0, 1…… 11 ; L为 0, 1 13。
需要说明的是, 需要将一组 RS可用资源的信息发送给 UE, —组 RS可 用资源的信息包括 RS的发送时刻配置, RS的发送周期, RS的偏移量, 如 下表所示:
Figure imgf000012_0001
例如当 RS发送时刻配置 cSI-RS为 36时, 对应表中的 35-74—行, 可以 查出 RS的周期为 40个 TTI , RS偏移为 1 , 这表示 RS在编号为 1、 41、 81、 121 ... ...的 TTI上被发送。在本发明实施例提供的方案中, RS发送时刻配置 CSI-RS为 0, 表示 RS的周期为 5个 TTI , RS偏移为 0, 即 RS在编号为 0、 5、 10、 15……的 TTI上被发送, 并且发送 RS的 PRB为所有 PRB。
需要说明的是, 将 RS预设发送时间和 RS预设频点发送给 UE的可以为 至少两个小区中的任一个小区, 也可以为小区组合; 小区组合为多个小区, 小区组合可以包括所述至少两个小区中的任意 N (N>1)个小区。
步骤 502,所述 UE接收至少两个小区中的任一个小区发送的 RS预设发 送时间和 RS预设频点;
步骤 503, 至少两个小区中的任一个小区获取相同的 RS序列信息, 并 将所述相同的 RS序列信息发送给所述 UE, 所述 RS序列信息用于生成所述 RS;
具体地,至少两个小区中的每个小区发送的 RS都是由某一序列生成的, 例如在 LTE的进一步演进(LTE-Advanced) 系统中, CSI-RS序列的生成公 式为
+ i)), w - 0,1,...,N™X'DL -1
Figure imgf000013_0001
其中, c(.)表示随机序列,该序列的特性与小区标识号(Identity, ID) 和 TTI的编号相关, m表示 PRB的编号, N 表示下行的最大 PRB的数目。 小区按照上述公式生成长度为 N 的 r (m)之后,再映射到用于发送 CSI-RS 的 RE上, 与其它信号一起发送给 UE。
因此, 小区在生成 CSI-RS之前需要获取小区 ID和 TTI的编号, 所述 小区 ID和 TTI的编号都属于 RS序列相关信息。 在本发明中, 各个小区按 照 RS预设发送时间和 RS预设频点发送的 RS序列具有相同特性, 就使得各 个小区用于生成 CSI-RS所使用的小区 ID和 TTI的编号是相同的, 这样 UE 只需对按照一组 RS序列相关信息生成的序列进行测量。
需要说明的是, 相同的 RS序列信息中的相同指向所述 UE发送 RS时, 发送的时间和频点与 RS预设的发送时间和 RS预设频点相同。
进一步地, 至少两个小区中的任一个小区获取相同的 RS序列信息的方 式可以为以下任一种:
方式一: 从所述 UE的服务小区获取相同的 RS序列信息;
在 CoMP (Coordinated Multiple Point transmission/ rece tion, 十办 作多点发送 /接收) 系统中, 通过 PDCCH ( Phys ica l Downl ink Control Channe l ,物理下行控制信道)发送信令给 UE的小区被称为 UE的服务小区, UE的服务小区通常是 UE接入的小区, 并且通常信道状态最佳; 其它发送数 据给 UE的小区被称为协作小区; 服务小区和协作小区构成了协作集合。
对于仅受到 1个小区服务的 UE, 这 1个小区即是 UE的服务小区, 该小 区发送给 UE的 RS序列相关信息由该小区确定, 例如 CSI-RS序列的生成过 程中所使用的小区 ID即是该小区的 ID;
对于受到多个小区服务的 UE ,服务小区确定 RS序列的相关信息,便于 UE从受到多个小区服务的状态转换到仅受到 1个小区服务的状态, 这样即 可确定 CS I-RS序列的生成过程中所使用的小区 ID为服务小区的 ID。
方式二: 通过所述至少两个小区之间的接口获取相同的 RS序列信息; 例如, 小区 1是 UE的服务小区, 则 RS序列相关信息由小区 1确定, 并通 过小区间接口将该信息传递给小区 2 , 便于小区 2使用与小区 1相同的 RS序列 相关信息。 例如, 小区 1将小区 1的 ID通过小区间的接口传递给小区 2 , 小区 2就可以才艮据该 ID生成与小区 1生成的 CSI-RS具有相同特性的 CSI-RS。 另夕卜, TTI的编号对于不同小区通常是一致的, 因此不需要通过小区间的接口传 递。
通常, 每个小区都受到基站的控制, 1个基站通常控制多个小区。 特别 地, 当小区 1和小区 2受到不同的基站控制时, 就需要通过基站间的接口 传递 RS序列相关信息, 这里基站间的接口也是小区间接口的一种。 例如, 在 LTE-Advanced系统中,基站间的接口被称为 X2接口, 小区 1受到基站 1 的控制, 小区 2受到基站 2的控制; 基站 1将小区 1的 ID通过基站间的接 口传递给基站 2 ,小区 2就可以根据该 ID生成与小区 1生成的 CSI-RS具有 相同特性的 CSI-RS。
这里仅以小区 1为服务小区为例, 小区 1也可以不是服务小区, 这是 与方式一的不同之处。
方式三: 所述至少两个小区确定各自的相同的 RS序列信息。 当至少两个小区中的各个小区所使用的 RS序列相关信息不易调整为一 致时, 小区间接口传递 RS序列相关信息不易实现, 则各个小区分别自行确 定各自的 RS序列信息。 例如, 对于基站间接口 (小区间接口的一种), 其 容量较小, 人们通常不希望该接口上传递 RS序列相关信息, 因此各个小区 所使用的 RS序列相关信息不易调整为一致, 所以在这些场景中, 所述小区 1和所述小区 2分别自行确定 RS序列相关信息,并根据各自的 RS序列相关 信息生成 RS。
步骤 504 , 所述 UE接收所述至少两个小区中的任一个小区发送的相同 的 RS序列信息, 所述 RS序列信息用于生成所述 RS;
需要说明的是, RS序列信息用于在 UE测量接收到的 RS , 这样, 至少 两个小区中的任一个小区利用 RS序列信息对应的 RS序列生成 RS ,向 UE发 送的过程中, 经历了无线信道, UE接收到之后, 利用相同的 RS序列信息对 应的 RS序列对接收到的经历了无线信道的信号进行卷积或其它类似操作, 就可以获知无线信道的 CSI。
步骤 505 , 所述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送时间和所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时间和所述 RS预设频点, 依次在不 同的 RS资源测量接收到的 RS;
需要说明的是, 上述步骤中在 RS资源上向 UE发送 RS的可以为一个小 区, 也可以为多个小区, 即小区的组合, 下面的描述按照至少两个小区中 的每一个小区向 UE发送 RS ,小区组合向 UE发送 RS两种发送方式进行描述。
第一种方式:
进一步地, 至少两个小区中的每一个小区向所述 UE发送 RS , 如图 6所 示, 在某个 PRB上, 小区在图示位置发送 RS , 即(9, 5)和(9, 6)的 RE上发送 RS , 则这个 PRB的这两个 RE就是该 PRB的 RS的预设发送时间和 RS预设频 点, RS的预设发送时间和 RS预设频点也可以称为 RS的图案。 其中, 一个 RS图案包括的 RE数目通常与发送 RS的天线端口数目相关, 例如图 6中的 RS图案包括 2个 RE , 对应 1个或 2个天线端口发送 RS的场景, 2个天线端 口可以通过码分的方式复用这两个 RE。
需要说明的是, 在相同的 RS资源, 各个小区发送 RS的情况为: 第一 小区按照所述 RS预设发送时间和所述 RS预设频点, 向所述 UE发送 RS , 所 述至少两个小区中的除所述第一小区之外的小区, 不按照所述 RS预设发送 时间和所述 RS预设频点向所述 UE发送所述 RS , 所述第一小区为所述至少 两个小区中的任一个小区;
例如, 当为 UE服务的小区为两个时, 在第一资源上, 小区 1按照 RS 预设发送时间和 RS预设频点, 向所述 UE发送 RS , 小区 2不按照所述 RS预 设发送时间和所述 RS预设频点向所述 UE发送所述 RS; 在第二资源上, 小 区 2按照 RS预设发送时间和 RS预设频点, 向所述 UE发送 RS , 小区 1不按 照所述 RS预设发送时间和所述 RS预设频点向所述 UE发送所述 RS。
需要说明的是, 如果 "小区 2不按照所述 RS预设发送时间和所述 RS 预设频点发送 RS" 可以被实现为 "不发送 RS" , 此时可以降低小区 1发送 的 RS受到的干扰, 有利于 UE测量小区 1的 RS; 然而小区 2的第 1资源上 的所述 RS预设发送时间和 RS预设频点就不能被小区 2的其它 UE用来测量 CSI , 当 UE数较多时, 这样会导致 CSI-RS的容量不足的问题, 因此小区 2 也可以按照另外的 RS图案来发送 RS ,便于除了所述 UE之外的其它 UE测量 CSI。
具体地, 小区 2不按照所述 RS预设发送时间和所述 RS预设频点发送 RS包括两种方式:
方式一:按照与所述 RS的图案不同的 RS图案,向所述 UE发送所述 RS , 这里所述 RS的图案具体指所述 RS预设发送时间和所述 RS预设频点;
具体地, 小区 1和小区 2发送的 RS预设发送时间和 RS预设频点 ( RS 的图案) 不一样, 例如, 在编号为 0、 10、 20... ...的 TTI (第 1资源)上, 对于同一个 PRB, 小区 1发送 RS的图案为(9, 5)和(9, 6)两个 RE, 小区 2发 送 RS的图案为(3, 5)和(3, 6)两个 RE。 在编号为 5、 15、 25... ...的 TTI (第 2资源)上, 对于同一个 PRB, 小区 1发送 RS的图案为(4, 5)和(4, 6)两个 RE, 小区 2发送 RS的图案为(9, 5)和(9, 6)两个 RE, 即即小区 1发送 RS所 使用的图案在第 1资源和第 2资源上发生了跳变。 这样, 其它 UE可以在第 1资源上在(3, 5)和(3, 6)两个 RE上检测小区 2发送的 RS , 也可以在第 2资 源上在(4, 5)和(4, 6)两个 RE上检测小区 1发送的 RS。
方式二: 所述至少两个小区中的除所述第一小区之外的小区, 在所述 RS预设发送时间和所述 RS预设频点上不发送信号。
具体地, 假设为 UE服务的小区为两个, 在第一资源上, 小区 1按照所 述所述 RS预设发送时间和所述 RS预设频点向所述 UE发送 RS ,小区 2在所 述 RS预设发送时间和所述 RS预设频点上不发送信号; 在第二资源上, 小 区 2按照所述所述 RS预设发送时间和所述 RS预设频点向所述 UE发送 RS , 小区 1在所述 RS预设发送时间和所述 RS预设频点上不发送信号。
小区 2在小区 1发送的 RS的图案上不发送信号, 从而小区 2不会对小 区 1发送的信号造成干扰, 便于 UE测量小区 1发送的 RS。 同理, 小区 1在 小区 2发送 RS的图案上不发送信号, 从而小区 1不会对小区 2发送的信号 造成干扰, 便于 UE测量小区 2发送的 RS。
例如, 在编号为 0、 10、 20……的 TTI (第 1资源)上, 小区 1和小区 2所发送的 RS的图案如图 7所示, 对于同一个 PRB, 如图 7 A )所示, 小区 1发送 RS的图案为(9,5)和(9,6)两个1^ , 如图 7 B )所示, 小区 2发送 RS 的图案为(9, 7)和(9, 8)两个 RE,并且小区 2在小区 1发送 RS所对应的图案 上不发送信号, 即小区 2在(9, 5)和(9, 6)两个 RE上不发送信号, 如图 7 B ) 所示。
同理, 在编号为 5、 15、 25... ...的 TTI (第 2资源)上, 小区 1和小区 2所 发送的 RS的图案如图 8所示, 对于同一个 PRB, 如图 8 A ) 所示, 小区 1发送 RS的图案为(9, 7)和(9, 8)两个 RE , 如图 8 B ) 所示, 小区 2发送 RS的图案为 (9, 5)和(9, 6)两个 RE , 并且小区 1在小区 2发送 RS所对应的图案上不发送信 号, 即小区 1在(9, 5)和(9, 6)两个 RE上不发送信号, 如图 8 B )所示。 进一步地, 由于小区在时间上的发送功率往往需要保持恒定, 因此在 这种情况下需要将功率进行重新分配。 从图 9所示, 小区 1在编号为 0的 TTI 上发送 RS是在第 5个符号和第 6个符号上(即 L=5, 6) , 而在编号为 5的 TTI上发 送 RS是在第 7个符号和第 8个符号上(即 1=7, 8) , 则当小区 1在编号为 5的 TTI 上发送 RS时, 由于在第 5和 6个符号上的(9, 5)和(9, 6)两个 RE并不需要发送 信号, 小区可以增加在第 5、 6个符号上除了(9, 5)和(9, 6)这两个 RE之外的 之外的其它信号。
或者, 由于当小区 2在编号为 0的 TTI上发送 RS时, 在(9, 5)和(9, 6) 两个 RE上不传输信号,因此除了这两个 RE之外的其它 RE的信号功率较高。 而当小区 2在编号为 5的 TTI上发送 RS时, 需要在这两个 RE上传输信号, 则需要降低在第 5个符号和第 6个符号上(1=5, 6)除了 RS之外的其它信号 的功率, 保证在编号为 5的 TTI上发送 RS时该符号的发送功率与在编号为 0的 TTI上发送 RS时该符号的发送功率相等。
第二种方式:
进一步地, 小区组合通过不同的 RS资源向所述 UE发送 RS; 例如, 在 编号为 0、 10、 20... ...的 TTI (第 1资源)上, 小区 1发送 RS的图案为(9, 5) 和(9, 6)两个 RE , 小区 2不在这两个 RE上发送 RS; 在编号为 5、 15、 25 ... ... 的 TTI (第 2资源)上, 小区 1和小区 2联合在图案为(9, 5)和(9, 6)两个 RE上发送 RS , 在这里, 小区的组合即表示小区 1和小区 2 ;
其中,一个 RS图案包括的 RE数目通常与发送 RS的天线端口数目相关, 当小区组合向 UE发送 RS时, 所使用的天线端口数目总和与单个小区向 UE 发送 RS时的端口数目相同。 例如, 小区 1向 UE发送 4个天线端口的 RS , 则当小区 1和小区 2联合向 UE发送 RS时, 小区 1和小区 2所使用的天线 端口数目总和同样为 4 , 小区 1发送天线端口为 0和天线端口为 1的 RS , 小区 2发送天线端口为 2和天线端口为 3的 RS ,这样就可以不需向 UE发送 额外的信令通知天线端口的变化。 进一步地, 各个小区向 UE发送 RS所使用的 RS的图案的编号根据所有 RS 图案的总数、 资源编号、 小区 ID、 按照所述 RS图案向 UE发送 RS的小区总数、 随机序列中部分参数或全部参数计算得出, 具体地, 小区发送 RS所使用的 图案与所有 RS图案的总数相关, 便于将 RS图案的编号限制在正确的范围内; 小区发送 RS所使用的图案与资源编号相关, 则就能实现小区在不同资 源上、 按照不同 RS图案发送 RS;
小区发送 R S所使用的图案与小区 I D相关, 则就能使得在同一个资源上、 不同小区使用不同的 RS图案发送 RS;
小区发送 RS所使用的图案与按照所述 RS图案向 UE发送 RS的小区总数相 关, 便于将 RS图案的编号限制在所有 RS图案的某几个 RS图案内, 从而便于 UE仅测量特定的几个小区发送的 RS;
小区发送 RS所使用的图案与随机序列相关, 有助于对 UE接收到的 RS所 受到的干扰随机化, 由于临近小区和本小区发送 RS时采用不同的时频格点 所受到的干扰是不一样的, 如果临近小区和本小区使用相同的时频格点时, 干扰会一直很大, 如果发送 RS采用的时频格点受到随机序列的控制, 则在 不同的时刻就可以使用不同的 RS的时频格点发送 RS , 这样, 本小区发送 RS 时受到的干扰就会随机化。
通常, 可以将各个小区向 UE发送 RS所使用的 RS的图案( RS预设发送 时间和 RS预设频点)进行编号, 如下表所示, 给出了 A个天线端口发送 RS 的情况下对应的所有 RS图案的编号表, 其中共有 M种 RS图案, (KU,LU) 表示编号为 i的 RS图案的第 j个天线端口对应的 RE。
Figure imgf000019_0001
具体地, 各个小区向 UE发送 RS所使用的 RS的图案进行编号, 可以采 用以下的方式:
方式一: Pattern—ID = (Cell_ID+N_TTI)mod M; 其中, Pattern—ID表 示发送所述 RS的 RS预设发送时间和 RS预设频点的编号, Cell_ID表示发 送所述 RS的小区的标识, ITTI表示发送所述 RS的传输时间间隔 TTI的编 号, 或者发送 RS的周期编号, mod表示取模运算, M的值被预设置在各个 小区和 UE两
例如: 任一' J、区的小区 ID为 1, M为 20, 则: 在第 1个 TTI (N_TTI=1 ), 计 算得到 Pattern_ID= ( 1+1 ) mod 20=2, 因此在第一 TTI上, 任一' 区按照编 号为 2的 RS图案发送 RS; 在第 20个 TTI ( N_TTI=20 ), 计算得到 Pattern_ID= ( 1+20) mod 20=1, 因此在第 20个 TTI上, 任一小区按照编号为 1的 RS图案 发送 RS;
方式二: Pattern_ID = (Cel 1_ID+N_TTI) mod N.cell;其中, Pattern— ID 表示发送所述 RS的 RS预设发送时间和 RS预设频点的编号, Cell_ID表示 发送所述 RS的小区的标识, ITTI表示发送所述 RS的传输时间间隔 TTI的 编号, 或者发送 RS的周期编号, mod表示取模运算, lcell表示发送所述 RS的小区的数目, lcell的值预设置在小区和 UE侧, 例如 N_TTI=2, 这样 可以不需要信令; 或者各个小区向 UE发送信令通知该值, 这样能更灵活地 配置该值。
例如: 任一' J、区的小区 ID为 1, N_cell=2, 则: 在第 1个 TTI ( N_TTI = 1 ), 计算得到 Pattern_ID= ( 1+1 ) mod 2=0, 因此在第 1个 TTI上, 任一' J、区按照 编号为 0的 RS图案发送 RS;
方式三: Pattern—ID = (Cell_ID+N_TTI + c (N_TTI)) mod lcell; 其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点的编 号, Cell_ID表示发送所述 RS的小区的标识, ITTI表示发送所述 RS的 传输时间间隔 TTI的编号, 或者发送 RS的周期编号, mod表示取模运算, lcell表示发送所述 RS的小区的数目, c (ITTI)表示随机序列, 对于不同 的 ΙΤΤΙ, 其值不同, 该序列可以预设置在 UE和小区侧; 例如: 任一' 区的小区 ID为 1, 当 ITTI为 1, 2, 3, ......时, c(N_TTI) 的取值分别为 4, 16, 21,……; N_cell=2, 则: 在第 1个 TTI (N_TTI=1 ), 计算得到 Pattern_ID= ( 1+1+4 ) mod2= 0, 因此在第 1个 TTI上, 任一'』、区 按照编号为 0的 RS图案发送 RS;
方式四: Pattern_ID= (Cell_ID+ LlTTI / (KxP_FB)」) mod N_cel 1; 其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点的编 号, Cell_ID表示发送所述 RS的小区的标识, ITTI表示发送所述 RS的传 输时间间隔 TTI的编号, 或者发送 RS的周期编号, P-FB表示所述 UE反馈 所述 CS I的周期; K表示自然数 , L.」表示向下取整, mod表示取模运算, I ce 11 表示发送所述 RS的小区的数目, 例如 lcell可以表示按照所述 RS图案向 UE发送 RS的小区总数;
需要说明的是, 由于 LlTTI /(KxP_FB)」在每 KxP_FB个 TTI才会递增 1, 就 表示 UE每反馈 K次测量的 RS, RS图案的编号才变化一次。 这样做的好处是, 可以使 UE对一个小区发送的 RS测量多次之后再反馈, 从而增强 UE测量的精 度。
方式五: Pattern_ID= (Cell_ID+ LN-TTI /KxN.rankJ) modN.cell; 其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点的编 号, Cell_ID表示发送所述 RS的小区的标识, ITTI表示发送所述 RS的传 输时间间隔 TTI的编号, K表示自然数, Irank表示 UE反馈一次秩指示 RI 所需要的发送所述 RS的周期数目,〔.」表示向下取整, lcell表示发送所述 RS的小区的数目, 例如 lcell表示按照所述 RS图案向 UE发送 RS的小区 总数;
需要说明的是, 在现在的通信系统中, 往往需要 UE反馈多种 CSI, 包 括 CQI ( Channel Quality Indicator, 信道质量指示)、 PMI ( Precoding Matrix Indicator, 预编码巨阵指示)以及 RI ( Rank Indicator, 秩指示), 其中 CQI 携带了 UE 推荐使用的调制编码方案 (Modulation and Coding Scheme, MCS ), 其中 PMI和 RI表征空间维度的 CSI, 通常 RI的反馈周期是 最长的, 因此, UE反馈一次 RI, 小区才能获得一次完整的 CSI;
由于 LlTTI I KxN_rank」在每 Kxlrank的时间才会递增 1, 就表示 UE 每反馈 K次 Rank, RS图案的编号才变化一次。 这样做的好处是, 可以使 UE 对一个小区发送的 RS测量之后,反馈多次使小区获得完整信息(包括 CQI、 PMI、 RI ), 从而便于小区对 UE的调度。
步骤 506, 所述 UE接收通过不同的 RS资源发送的所述 RS, 并依次在 所述不同的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设频点测量 所述 RS, 获得所述至少两个小区与所述 UE之间的 CSI;
UE接收到 RS后, 按照接收到的 RS预设发送时间、 RS预设频点和 RS 序列信息, 在每个资源上测量 RS, 即可获得小区与 UE之间的 CSI, 现有技 术中, UE需要测量各个小区发送的 RS, 这样会增加 UE的复杂度, 而本发 明实施例提供的方案中, UE 只需要测量按照所述 RS预设发送时间和所述 RS预设频点发送的所述 RS, 即只需要测量一个 RS, 从而降低了 UE的复杂 度。
需要说明的是, 对于需要获知多个小区对应 CSI的 UE, 可以通过前述 的方法, 配置该 UE以 5个 TTI为周期来测量小区 1或 2发送的 RS, 即在编 号为 0、 5、 15......的 TTI上测量小区发送的 RS, 也就是说, UE在编号为 0、
10、 20......的 TTI (第 1资源)上测量的 RS是由小区 1发送的, UE在编号 为 5、 15、 25......的 TTI (第 2资源)上测量的 RS是由小区 2发送的。 由 于负责调度的小区通过有线连接等方式能够获知小区 1 和小区 2 对应的 CSI, 就能够对该 UE进行 CoMP调度;
对于不需要获知多个小区对应 CSI的 UE, 则可以配置该 UE以 10个 TTI为周 期来测量, 即在编号为 0、 10、 20......的 TTI上测量小区发送的 RS, UE在这 些 TTI上收到的 RS都是由小区 1发送的, 并且此时可以通过滤波来获得更好 的测量精度, 即设置 k不为 0。
在这里, 需要获知多个小区对应 CSI的第一 UE, 每隔 5个 TTI就会接 收到小区发送的一次 RS,而不需要获知多个小区对应 CSI的第二 UE仅每隔 10个 TTI才测量一次小区发送的 RS, 即第二 UE测量的 RS只是小区发送的 RS的一个子集。
这样, 对于一个考虑了兼容性的系统来说, 这一点是艮有用的。 例如, 3GPP ( 3rd generation partnership project , 第三代合作伙伴计戈 'J ) 的 多个无线通信系统版本之间期望具有兼容性, 例如 Release 11 (简称 R11 ) 的版本期望兼容 Release 10 (简称 R10)。 此时, 所述支持 R10的 UE即是不需 要获知多个小区对应 CS I的 UE , 因为当 Rl 1的系统向其发送多个小区协作调 度的信号时其无法正常接收。 在这种场景中, 就可以通过本发明仍然使所 述 R10的 UE正常工作; 同时也可以把支持 R11的 UE视为需要获知多个小区对 应 CSI的 UE, 并利用本发明使支持 R11的 UE获得 CoMP技术带来的好处。
步骤 507, 所述至少两个小区中的任一个小区设置滤波系数为 0, 并向 所述 UE发送滤波系数和滤波周期, 以使所述 UE对测量所述 RS获得的所述 至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI进行滤波; 具体地, 向所述 UE发送滤波系数设置为 0, 这样, 第 n次测量之后, 再滤波后的结果, 就是第 n次测量的测量值。
在现有技术中, 为了使 UE测量各个小区发送的 RS获得更好的精度, 往往通过一个系数 FilterCoefficient来控制 UE对多次测量结果的滤波, 小区发送系数 FilterCoefficient给 UE, UE通过多次测量 RS之后, 通过 下面的公式计算得到滤波之后的结果, 并将该值反馈给 d、区。
Fn ={\-a)-Fn_^a-Mn^ 其中 Mn表示第 n次的测量值, Fn表示第 n次测 量之后再滤波后的结果, 对于第一次测量, F0被设置为 Ml, a = l/2(k/4), 其中 k是滤波系数 F i 1 terCoeffi c ient。
从该公式可以看出, 如果 k被设置为 0, 则 a=l, 因此 = «, 即表示 第 n次测量之后再滤波后的结果就是第 n次测量的测量值。
对于本发明实施例提供的方案, 这样设置的好处是, 避免了 UE对多个 小区发送的 RS进行滤波, 而导致估计的不准确。 例如, UE被配置为测量编 号为 1的 RS图案, 而在第 1个 TTI和第 2个 TTI, 其测量的 RS分别是由小 区 1和小区 2发送的, 此时, 如果配置 UE的滤波参数 k不为 0, 则根据上 述公式, UE在第 2个 TTI反馈的 CSI还反映了第 1个 TTI测量得到的 CSI, 因此如果小区收到 UE反馈的 CSI之后, 将该 CSI作为小区 2的 CSI是不准 确的; 而如果将滤波参数 k设置为 0, 则根据上述公式, UE在第 2个 TTI 反馈的 CSI仅反映了第 2个 TTI测量得到的 CSI, 即 UE在第 2个 TTI反馈 的 CSI只反映了小区 2的 CSI, 因此如果小区收到 UE反馈的 CSI之后, 可 以将该 CSI作为小区 2的 CSI。
对于发送滤波周期, 是为了指示 UE所测量的、 用于滤波的 RS的周期, 例如, UE测量小区发送的 RS的周期是 5, 在编号为 0、 10、 20......的 TTI (第 1资源)上测量的是小区 1发送的 RS, 在编号为 5、 15、 25......的 TTI (第 2资 源)上测量的是小区 2发送的 RS。 如果 UE的滤波系数被配置为 0, 则 UE反馈 的 CSI是未经过滤波的测量值, 此时由于未经滤波而导致反馈的值的精度不 高。
因此为了同时保证反馈的结果的精度, 并保证 UE反馈的结果仅反映某 个小区的 CSI, 可以向 UE发送滤波周期为 10, 这样, UE仅在间隔为 10的 TTI上测量并进行滤波。 例如, UE在编号为 0、 10、 20……的 TTI (第 1资 源)上测量了多个值, 对这些值应用公式 1— Ίι+ΰί·Μ", 例如在编 号为 10的 ΤΤΙ上反馈的结果是 Fn-1, 则在编号为 20的 TTI上测量得到的 值为 Mn, 则反馈的结果是7" ^1— ^'^^^, 由于用于滤波的 RS测量值 都是通过测量由小区 1发送的 RS得到的, 滤波的结果反应了小区 1与 UE 的 CSI, 对于小区 2同理。
步骤 508, 所述 UE接收所述至少两个小区中的任一个小区发送的滤波 系数和滤波周期, 并对测量所述 RS后获得的所述至少两个小区中任一个小 区或者小区组合与所述 UE之间的 CSI进行滤波;
需要说明的是, 步骤 505-步骤 508的执行顺序并不是严格固定的, 可 以在执行完步骤 505后, 执行 507, 然后 UE在执行 506和 508, 或者步骤 505和步骤 507同时执行, 步骤 506和步骤 508同时执行。 步骤 509 ,所述 UE向所述至少两个小区中的任一个小区发送测量结果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所述 UE 之间的 CSI。
需要说明的是, 现有技术中, UE需要测量各个小区发送的 RS , 并将获 得的各个小区与 UE之间的 CSI反馈给各个小区, 会带来较大的反馈开销, 并且对于现有技术中的 UE 由于不能反馈多个小区所对应的 CS I 的测量结 果, 负责调度的小区则不能获得各个小区与 UE之间的 CSI , 使得各个小区 之间无法实现合理的协作,本发明实施例提供的方案 UE只需要反馈一个 RS 对应的 CSI , 减少了反馈的开销, 从而可以使负责调度的小区, 能够从那些 不能反馈多个小区与 UE之间的 CSI的 UE的反馈中获得多个小区与 UE之间 的 CSI , 便于实现合理协作。
步骤 511 , 所述至少两个小区中的任一个小区接收所述 UE发送的测量 结果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与 所述 UE之间的信道状态信息 CSI。
需要说明的是, 接收 UE发送的测量结果的执行主体可以为 UE的服务 小区, 也可以为 UE的协作集合里的小区。
需要说明的是, 当负责调度的小区获知单个小区与 UE之间的 CSI , 这 样可以灵活地选择合理的小区向 UE发送信号, 提升传输的效率, 例如选择 传输效率最高的 CSI所对应的小区为 UE服务。
当负责调度的小区获知小区组合与 UE之间的 CSI , 小区就可以根据这 些 CSI灵活调度, 例如, 当小区 1与小区 2与 UE之间的联合 CSI能带来更 高传输效率时, 就可以同时调度小区 1和小区 2为 UE服务。
本发明实施例提供的一种获取信道状态信息的方法, 通过接收至少两 个小区中的任一个小区发送的 RS预设发送时间和 RS预设频点, 然后接收 任一个小区或者小区组合通过不同的 RS资源发送的所述 RS ,并在所述不同 的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设频点测量所述 RS , 获得所述至少两个小区或者小区组合与所述 UE之间的 CSI , 并将测量结果 发送给至少两个小区中的任一个小区, 与现有技术中在获得多个小区与 UE 之间的无线信道的 CSI时, 会带来较多的信令开销和反馈开销, 增加 UE工 作的复杂度相比, 本发明实施例提供的方案通过向 UE发送一个 RS的信息, 使得 UE可以只测量一个 RS并且反馈一个 RS对应的 CSI, 这样可以减少信 令开销和反馈开销, 降低 UE工作的复杂度。
本发明实施例提供一种获取信道状态信息的装置, 该装置用于图 5 的 实施例中至少两个小区中的任一个小区侧的方法, 该装置为 UE服务的至少 两个小区中的任一个小区, 具体的, 可以为小区中的基站或者收发节点, 如图 9所示, 该装置包括: 发送单元 901, 执行单元 902, 计算单元 903, 参考信息发送单元 904, 设置单元 905, 滤波信号发送单元 906, 接收单元 907。
发送单元 901,用于将参考信号 RS预设发送时间和 RS预设频点发送给
UE;
时间和频点也可以称为时频格点, RS 资源在时间上以 TTI Transmission Time Interval, 传输时间间隔) 为单位, 在频率上以 PRB (Physical Resource Block,物理资源块)为单位, 1个 TTI的长度为 lms, 1个 TTI包括 14个符号; 1个 PRB为 1个 TTI内的 12个子载波, 其中每个 符号上的每个子载波成为 1个 RE ( Resource Element, 资源单元), 即 1个 PRB包括( 12*14 ) 个 RE, 每个 RE对应以符号为单位的某个时间以及以子 载波为单位的某个频点, 具体地, 将 RE的发送时间、 RE的数目, RE的格 式发送给 UE, RE的格式可以用(K, L)表示, K表示 PRB,取值为 0, 1…… 11; L表示 TTI, 取值为 0, 1…… 13, 这里 RS预设发送时间和 RS预设频点也可 以称为 RS的图案信息。
执行单元 902, 用于获取相同的 RS序列信息, 并将所述相同的 RS序列 信息发送给所述 UE, 所述 RS序列信息用于生成所述 RS;
具体地,至少两个小区中的每个小区发送的 RS都是由某一序列生成的, 例如在 LTE的进一步演进(LTE-Advanced) 系统中, CSI-RS序列的生成公 式为
+ i)), w - 0,1,...,N™X'DL -1
Figure imgf000027_0001
其中, c(.)表示随机序列,该序列的特性与小区标识号(Identity, ID) 和 TTI的编号相关, m表示 PRB的编号, N 表示下行的最大 PRB的数目。 小区按照上述公式生成长度为 N 的 r (m)之后,再映射到用于发送 CSI-RS 的 RE上, 与其它信号一起发送给 UE;
需要说明的是, 相同的 RS序列信息中的相同指向所述 UE发送 RS时, 发送的时间和频点与 RS预设的发送时间和 RS预设频点相同。
所述执行单元 902具体用于: 从所述 UE的服务小区获取相同的 RS序 列信息, 所述服务小区为通过物理下行控制信道 PDCCH向 UE发送信令的小 区; 或者, 通过所述至少两个小区之间的接口获取相同的 RS序列信息; 或 者, 所述至少两个小区确定各自的相同的 RS序列信息。
在 CoMP (Coordinated Multiple Point transmission/ rece tion, 十办 作多点发送 /接收) 系统中, 通过 PDCCH ( Physical Downlink Control Channel,物理下行控制信道)发送信令给 UE的小区被称为 UE的服务小区, UE的服务小区通常是 UE接入的小区, 并且信道状态最佳; 其它发送数据给 UE的小区被称为协作小区; 服务小区和协作小区构成了协作集合;
需要说明的是, 为了方便按照 RS预设发送时间和 RS预设频点向 UE发 送 RS, 或者不按照 RS预设发送时间和 RS预设频点向 UE发送 RS, 可以将 RS预设发送时间和 RS预设频点进行编号。
计算单元 903,用于所述 RS预设发送时间和 RS预设频点的编号根据所 有的 RS预设发送时间和 RS预设频点的总数、 RS资源编号、 小区标识、 向 所述 UE发送 RS的各个小区总数、 随机序列中的部分参数或者全部参数计 算得出。
具体地, 所述计算单元 903 具体用 于根据 Pattern—ID =
(Cell_ID+N_TTI)modM; 或者, Pattern_ID= (Cel 1_ID+N_TTI) modN.cell; 或者, Pattern—ID = (Cell_ID+N_TTI + c(N_TTI)) mod N_cell; 或者, Pattern—ID = (Cell_ID+ LN-TTI / (KxP_FB) J ) mod N—cell ; 或者, Pattern—ID = (Cell_ID+ LN-TTI /KxN.rankJ ) mod N—cell, 计算所述 RS预设发送时间和 RS预设频点的编号;
其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点 的编号; Cell_ID表示发送所述 RS的小区的标识; ITTI表示发送所述 RS 的传输时间间隔 TTI的编号, 或者发送 RS的周期编号; mod表示取模运算; M的值被预设置在各个小区和 UE两侧; lcell表示发送所述 RS的小区的 数目, lcell的值预设置在小区和 UE侧, 这样可以不需要信令, 或者各个 小区向 UE发送信令通知该值, 这样能更灵活地配置该值; c(N_TTI)表示随 机序列,该序列可以预设置在 UE和小区侧; P_FB表示所述 UE反馈所述 CSI 的周期; K表示自然数; 〔.」表示向下取整; Irank表示 UE反馈一次秩指 示 RI所需要的发送所述 RS的周期数目。
参考信息发送单元 904,用于按照所述 RS预设发送时间和所述 RS预设 频点, 通过 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送 时间和所述 RS预设频点, 依次在所述不同 RS资源上测量接收到的 RS; 为 所述 UE服务的至少两个小区, 在按照所述 RS预设发送时间和所述 RS预设 频点向所述 UE发送 RS时, 使用的 RS资源为不同的 RS资源;
需要说明的是, 当至少两个小区中的任一个小区向所述 UE发送 RS时, 所述参考信息发送单元还用于: 在第一小区按照所述 RS预设发送时间和所 述 RS预设频点向所述 UE发送 RS的 RS资源上, 不按照所述 RS预设发送时 间和所述 RS预设频点向所述 UE发送所述 RS, 所述参考信息发送单元所在 的装置所属的小区与所述第一小区是不同的, 所述第一小区为所述至少两 个小区中的任一个小区;
其中, 所述参考信息发送单元还用于: 在第一小区按照所述 RS预设发 送时间和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 在所述 RS预设 发送时间和所述 RS预设频点上不发送信号。 需要说明的是, 不同小区的参考信号发送单元可以通过 RS资源同时向 UE发送 RS。
设置单元 905 , 用于设置滤波系数为 0;
这里, 设置滤波系数为 0 , 这样, 第 n次测量之后, 再滤波后的结果, 就是第 n次测量的测量值。 发送滤波周期, 是为了指示 UE所测量的、 用于 滤波的 RS的周期。
滤波信号发送单元 906 ,用于向所述 UE发送所述滤波系数和滤波周期, 以使所述 UE对测量所述 RS获得的所述至少两个小区中任一个小区或者小 区组合与所述 UE之间的 CS I进行滤波。
接收单元 907 , 用于接收所述 UE发送的测量结果, 所述测量结果包括 所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状态信 息 CS I。
所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状 态信息 CS I是 UE测量 RS后, 经过滤波之后的结果。
本发明实施例提供的一种获取信道状态信息的装置, 通过发送单元将 参考信号 RS预设发送时间和 RS预设频点发送给用户设备 UE , 参考信号发 送单元按照所述 RS预设发送时间和所述 RS预设频点, 通过不同的 RS资源 向 UE发送 RS , 然后接收单元接收所述 UE发送的测量结果, 所述测量结果 包括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状 态信息 CS I。与现有技术中在获得多个小区与 UE之间的无线信道的 CS I时, 会带来较多的信令开销和反馈开销, 增加 UE工作的复杂度相比, 本发明实 施例提供的方案通过向 UE发送一个 RS的信息,使得 UE可以只测量一个 RS 并且反馈一个 RS对应的 CS I , 这样可以减少信令开销和反馈开销, 降低 UE 工作的复杂度。
本发明实施例还提供一种获取信道状态信息的装置, 该装置用于图 5 的实施例中 UE侧的方法, 该装置可以为 UE , 如图 10所示, 该装置包括: 第一接收单元 1001 , 第二接收单元 1002 , 接收参考信号单元 1003 , 接收滤 波信号单元 1004 , 发送单元 1005。
第一接收单元 1001 , 用于接收至少两个小区中的任一个小区发送的 RS 预设发送时间和 RS预设频点;
第二接收单元 1002 , 用于接收所述至少两个小区中的任一个小区或者 小区组合发送的相同的 RS序列信息, 所述 RS序列信息用于生成所述 RS; 需要说明的是, RS序列信息用于在 UE测量接收到的 RS , 这样, 至少 两个小区中的任一个小区利用 RS序列信息对应的 RS序列生成 RS ,向 UE发 送的过程中, 经历了无线信道, UE接收到之后, 利用相同的 RS序列信息对 应的 RS序列对接收到的经历了无线信道的信号进行卷积或其它类似操作, 就可以获知无线信道的 CSI。
接收参考信号单元 1003 , 用于接收通过不同的 RS资源发送的所述 RS , 并依次在所述不同的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设 频点测量所述 RS , 获得所述至少两个小区与所述 UE之间的 CSI ;
UE接收到 RS后, 按照接收到的 RS预设发送时间、 RS预设频点和 RS 序列信息, 在每个资源上测量 RS , 即可获得小区与 UE之间的 CSI , 现有技 术中, UE需要测量各个小区发送的 RS , 这样会增加 UE的复杂度, 而本发 明实施例提供的方案中, UE 只需要测量按照所述 RS预设发送时间和所述 RS预设频点发送的所述 RS , 即只需要测量一个 RS , 从而降低了 UE的复杂 度。
接收滤波信号单元 1004 , 包括接收所述至少两个小区中的任一个小区 发送的滤波系数和滤波周期, 并对测量所述 RS后获得的所述至少两个小区 中任一个小区或者小区组合与所述 UE之间的 CSI进行滤波;
这里, 所述滤波系数为 0,根据接收到的设置滤波系数可滤波周期对测 量的 RS进行滤波, 在第 n次测量之后, 再滤波后的结果, 就是第 n次测量 的测量值。
发送单元 1005 , 用于向所述至少两个小区中的任一个小区发送测量结 果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所 述 UE之间的 CS I。
本发明实施例提供的一种获取信道状态信息的装置, 通过第一接收单 元接收至少两个小区中的任一个小区或者小区组合发送的 RS预设发送时间 和 RS预设频点, 然后接收参考信号单元接收通过不同的 RS资源发送的所 述 RS , 并在所述不同的 RS资源上,按照所述 RS预设发送时间和所述 RS预 设频点测量所述 RS , 获得所述至少两个小区与所述 UE之间的 CS I , 采用发 送单元, 将测量的结果发送给至少两个小区中的任一个小区。 与现有技术 中在获得多个小区与 UE之间的无线信道的 CS I时, 会带来较多的信令开销 和反馈开销, 增加 UE工作的复杂度相比, 本发明实施例提供的方案通过向
UE发送一个 RS的信息, 使得 UE可以只测量一个 RS并且反馈一个 RS对应 的 CS I , 这样可以减少信令开销和反馈开销, 降低 UE工作的复杂度。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局 限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可 轻易想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明 的保护范围应所述以权利要求的保护范围为准。

Claims

权利要求
1、 一种获取信道状态信息的方法, 其特征在于, 包括:
至少两个小区中的任一个小区将参考信号 RS预设发送时间和 RS预设 频点发送给用户设备 UE;
所述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送 时间和所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时间和所述 RS预设频点,依次在所述不同的 RS资 源上测量收到的 RS;
接收所述 UE发送的测量结果, 所述测量结果包括所述至少两个小区中 任一个小区或者小区组合与所述 UE之间的信道状态信息 CSI。
2、 根据权利要求 1所述获取信道状态信息的方法, 其特征在于, 在所 述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送时间和 所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS之前, 还包括: 获取相同的 RS序列信息,并将所述相同的 RS序列信息发送给所述 UE, 所述 RS序列信息用于生成所述 RS。
3、 根据权利要求 2所述获取信道状态信息的方法, 其特征在于, 所述 获取相同的 RS序列信息包括:
从所述 UE的服务小区获取相同的 RS序列信息, 所述服务小区为通过 物理下行控制信道 PDCCH向 UE发送信令的小区; 或者,
通过所述至少两个小区之间的接口获取相同的 RS序列信息; 或者, 所述至少两个小区确定各自的相同的 RS序列信息。
4、 根据权利要求 1所述获取信道状态信息的方法, 其特征在于, 当所 述至少两个小区中的每一个小区按照所述 RS预设发送时间和所述 RS预设 频点, 通过不同的 RS资源向所述 UE发送 RS时, 在第一小区按照所述 RS 预设发送时间和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 所述至 少两个小区中的除所述第一小区之外的小区, 不按照所述 RS预设发送时间 和所述 RS预设频点向所述 UE发送所述 RS , 所述第一小区为所述至少两个 小区中的任一个小区。
5、 根据权利要求 4所述获取信道状态信息的方法, 其特征在于, 所述 不按照所述 RS预设发送时间和所述 RS预设频点, 向所述 UE发送所述 RS 包括:
所述至少两个小区中的除所述第一小区之外的小区, 在所述 RS预设发 送时间和所述 RS预设频点上不发送信号。
6、 根据权利要求 5所述获取信道状态信息的方法, 其特征在于, 所述 RS预设发送时间和 RS预设频点的编号根据所有的 RS预设发送时间和 RS预 设频点的总数、 RS资源编号、 小区标识、 向所述 UE发送 RS的各个小区总 数、 随机序列中的部分参数或者全部参数计算得出。
7、 根据权利要求 6所述获取信道状态信息的方法, 其特征在于, 根据 Pattern—ID = (Cel 1— ID+N—TTI) mod M;或者, Pattern—ID = (Cell_ID+N_TTI) modN.cell; 或者, Pattern_ID= (Cel l— ID+N—TTI + c (N—TTI) ) modN.cell; 或者, Pattern—ID = (Cell_ID+ L .TTI / (KxP_FB)J ) mod N_cell ; 或 者, Pattern—ID = (Cell_ID+ L .TTI /KxN.rankJ ) mod N_cell , 计算 所述 RS预设发送时间和 RS预设频点的编号;
其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点 的编号, Cell_ID表示发送所述 RS的小区的标识, ITTI表示发送所述 RS 的传输时间间隔 TTI的编号, mod表示取模运算, lcell表示发送所述 RS 的小区的数目, c(N_TTI)表示随机序列, P_FB表示所述 UE反馈所述 CSI的 周期; K表示自然数, 〔.」表示向下取整, Irank表示 UE反馈一次秩指示
RI所需要的发送所述 RS的周期数目。
8、 根据权利要求 1所述获取信道状态信息的方法, 其特征在于, 在所 述至少两个小区中的每一个小区或者小区组合按照所述 RS预设发送时间和 所述 RS预设频点, 通过不同的 RS资源向所述 UE发送 RS之后, 还包括: 设置滤波系数为 0;
向所述 UE发送所述滤波系数和滤波周期, 以使所述 UE对测量所述 RS 获得的所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI 进行滤波。
9、 一种获取信道状态信息的方法, 其特征在于, 包括:
接收至少两个小区中的任一个小区发送的 RS预设发送时间和 RS预设 频点;
接收通过不同的 RS资源发送的所述 RS , 并依次在所述不同的 RS资源 上, 按照所述 RS预设发送时间和所述 RS预设频点测量所述 RS , 获得所述 至少两个小区与所述 UE之间的 CSI ;
向所述至少两个小区中的任一个小区发送测量结果, 所述测量结果包 括所述至少两个小区中任一个小区或者小区组合与所述 UE之间的 CSI。
10、 根据权利要求 9所述获取信道状态信息的方法, 其特征在于, 在 所述接收所述至少两个小区中的任一个小区或者小区组合通过不同的 RS资 源发送的所述 RS之前, 还包括:
接收所述至少两个小区中的任一个小区发送的相同的 RS序列信息, 所 述 RS序列信息用于生成所述 RS。
11、 根据权利要求 10所述获取信道状态信息的方法, 其特征在于, 在 所述接收所述至少两个小区中的任一个小区或者小区组合通过不同的 RS资 源发送的所述 RS之后, 还包括:
接收所述至少两个小区中的任一个小区发送的滤波系数和滤波周期, 并对测量所述 RS后获得的所述至少两个小区中任一个小区或者小区组合与 所述 UE之间的 CS I进行滤波, 所述滤波系数为 0。
12、 一种获取信道状态信息的装置, 其特征在于, 为用户设备 UE服务 的小区至少两个, 所述获取信道状态信息的装置为所述至少两个小区中的 任一个小区中的装置, 包括:
发送单元,用于将参考信号 RS预设发送时间和 RS预设频点发送给 UE; 参考信息发送单元, 用于按照所述 RS预设发送时间和所述 RS预设频 点, 通过 RS资源向所述 UE发送 RS , 以便所述 UE按照所述 RS预设发送时 间和所述 RS预设频点, 依次在所述不同的 RS资源上测量接收到的 RS; 为 所述 UE服务的至少两个小区, 在按照所述 RS预设发送时间和所述 RS预设 频点向所述 UE发送 RS时, 使用的 RS资源为不同的 RS资源;
接收单元, 用于接收所述 UE发送的测量结果, 所述测量结果包括所述 至少两个小区中任一个小区或者小区组合与所述 UE之间的信道状态信息 CSI。
13、 根据权利要求 12所述获取信道状态信息的装置, 其特征在于, 所 述装置还包括:
执行单元, 用于获取相同的 RS序列信息, 并将所述相同的 RS序列信 息发送给所述 UE , 所述 RS序列信息用于生成所述 RS。
14、 根据权利要求 13所述获取信道状态信息的装置, 其特征在于, 所 述执行单元具体用于:
从所述 UE的服务小区获取相同的 RS序列信息, 所述服务小区为通过 物理下行控制信道 PDCCH向 UE发送信令的小区; 或者,
通过所述至少两个小区之间的接口获取相同的 RS序列信息; 或者, 所述至少两个小区确定各自的相同的 RS序列信息。
15、 根据权利要求 12所述获取信道状态信息的装置, 其特征在于, 所 述参考信息发送单元还用于: 在第一小区按照所述 RS预设发送时间和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 不按照所述 RS预设发送时间 和所述 RS预设频点向所述 UE发送所述 RS , 所述参考信息发送单元所在的 装置所属的小区与所述第一小区是不同的, 所述第一小区为所述至少两个 小区中的任一个小区。
16、 根据权利要求 12所述获取信道状态信息的装置, 其特征在于, 所 述参考信息发送单元还用于: 在第一小区按照所述 RS预设发送时间和所述 RS预设频点向所述 UE发送 RS的 RS资源上, 在所述 RS预设发送时间和所 述 RS预设频点上不发送信号。
17、 根据权利要求 16所述获取信道状态信息的装置, 其特征在于, 所 述装置还包括:
计算单元, 用于所述 RS预设发送时间和 RS预设频点的编号根据所有 的 RS预设发送时间和 RS预设频点的总数、 RS资源编号、 小区标识、 向所 述 UE发送 RS的各个小区总数、 随机序列中的部分参数或者全部参数计算 得出。
18、 根据权利要求 17所述获取信道状态信息的装置, 其特征在于, 所 述计算单元具体用于: 根据 Pattern—ID = (Cell_ID+N_TTI)mod M; 或者, Pattern-ID = (Cell_ID+N_TTI) mod N.cell; 或者, Pattern—ID = (Cell-ID+N_TTI + c(N_TTI)) modN.cell;或者, Pattern—ID = (Cell_ID+ LN-TTI / (KxP_FB)J) modN.cell; 或者, Pattern—ID = (Cell_ID+ LN-TTI /KxN_rank」) mod N_cell, 计算所述 RS预设发送时间和 RS预设频点的编 号;
其中, Pattern_ID表示发送所述 RS的 RS预设发送时间和 RS预设频点 的编号, Cell_ID表示发送所述 RS的小区的标识, ITTI表示发送所述 RS 的传输时间间隔 TTI的编号, mod表示取模运算, lcell表示发送所述 RS 的小区的数目, c(N_TTI)表示随机序列, P_FB表示所述 UE反馈所述 CSI的 周期; K表示自然数, 〔.」表示向下取整, Irank表示 UE反馈一次秩指示 RI所需要的发送所述 RS的周期数目。
19、 根据权利要求 12所述获取信道状态信息的装置, 其特征在于, 所 述装置还包括:
设置单元, 用于设置滤波系数为 0;
滤波信号发送单元, 用于向所述 UE发送所述滤波系数和滤波周期, 以 使所述 UE对测量所述 RS获得的所述至少两个小区中任一个小区或者小区 组合与所述 UE之间的 CSI进行滤波。
20、 一种获取信道状态信息的装置, 其特征在于, 包括:
第一接收单元, 用于接收至少两个小区中的任一个小区发送的 RS预设 发送时间和 RS预设频点; 接收参考信号单元, 用于接收通过不同的 RS资源发送的所述 RS , 并依 次在所述不同的 RS资源上, 按照所述 RS预设发送时间和所述 RS预设频点 测量所述 RS , 获得所述至少两个小区与所述 UE之间的 CS I ;
发送单元, 用于向所述至少两个小区中的任一个小区发送测量结果, 所述测量结果包括所述至少两个小区中任一个小区或者小区组合与所述 UE 之间的 CS I。
21、 根据权利要求 20所述获取信道状态信息的装置, 其特征在于, 所 述装置还包括:
第二接收单元, 用于接收所述至少两个小区中的任一个小区发送的相 同的 RS序列信息, 所述 RS序列信息用于生成所述 RS。
22、 根据权利要求 21所述获取信道状态信息的装置, 其特征在于, 所 述装置还包括:
接收滤波信号单元, 包括接收所述至少两个小区中的任一个小区发送的滤 波系数和滤波周期, 并对测量所述 RS后获得的所述至少两个小区中任一个 小区或者小区组合与所述 UE之间的 CS I进行滤波, 所述滤波系数为 0。
PCT/CN2012/078971 2011-07-20 2012-07-20 一种获取信道状态信息的方法及装置 Ceased WO2013010504A1 (zh)

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