WO2010121538A1 - 一种用于多点协同传输的上行参考信号的配置方法和装置 - Google Patents

一种用于多点协同传输的上行参考信号的配置方法和装置 Download PDF

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Publication number
WO2010121538A1
WO2010121538A1 PCT/CN2010/071918 CN2010071918W WO2010121538A1 WO 2010121538 A1 WO2010121538 A1 WO 2010121538A1 CN 2010071918 W CN2010071918 W CN 2010071918W WO 2010121538 A1 WO2010121538 A1 WO 2010121538A1
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Prior art keywords
srs
comp
cell
cell set
cells
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PCT/CN2010/071918
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English (en)
French (fr)
Inventor
沈祖康
高秋彬
肖国军
缪德山
潘学明
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Priority to KR1020117027405A priority Critical patent/KR101289399B1/ko
Priority to EP10766628.1A priority patent/EP2424285B1/en
Publication of WO2010121538A1 publication Critical patent/WO2010121538A1/zh
Priority to US13/278,161 priority patent/US9398584B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/27Control channels or signalling for resource management between access points
    • 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
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022Site diversity; Macro-diversity
    • H04B7/024Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Definitions

  • the present invention relates to the field of third generation mobile communication technologies, and in particular, to a method and an apparatus for configuring an uplink reference signal (SRS) for Coordinated Multi-Point Transmission.
  • SRS uplink reference signal
  • the International Telecommunication Union (ITU) puts very stringent requirements on the performance of the next generation of mobile communication systems (IMT-Advanced). For example, the maximum system transmission bandwidth reaches 100MHz, and the peak rate of uplink and downlink data transmission needs to reach 1Gbps and 500M bps, and it has a very high demand for the average spectrum efficiency of the system, especially the edge spectrum efficiency.
  • 3GPP proposed the use of multi-point coordinated transmission technology to improve system performance in its next generation mobile cellular communication system, the LTE-Advanced upgrade system (LTE-Advanced).
  • the user equipment participating in the multipoint coordinated transmission technology is referred to as a CoMP UE, and the user equipment not participating in the coordinated multipoint transmission technology is referred to as a non-CoMP UE; accordingly, a cell called a multipoint coordinated transmission technology is used. It is a CoMP Cell, or a cartridge is called a coordinated cell. For different CoMP UEs, the corresponding CoMP Cells may be different or the same.
  • each UE has a camping cell.
  • the camped cell of the non-CoMP UE may be its serving cell.
  • a non-CoMP UE may receive control information and data from its resident cell.
  • the CoMP UE receives control information from its resident cell.
  • a CoMP UE may receive data from its camped cell and/or coordinated cell.
  • Multi-point coordinated transmission technology is a collaboration between multiple transmission points separated by geographical location A mobile transmission technology that implements transceiving data or signaling.
  • Multiple transmission points may be base stations (eNodeBs) of different cells.
  • the multi-point coordinated transmission technology is divided into downlink coordinated transmission and uplink joint reception.
  • Downlink multipoint coordinated transmission technology solutions are mainly divided into two categories: joint scheduling and joint transmission. Joint scheduling allocates mutually orthogonal or quasi-orthogonal resources to different user equipments (UEs) by coordinating time, frequency and space resources between cells to avoid mutual interference. In the case of joint transmission, the base stations of multiple cells simultaneously transmit data to the same UE.
  • UEs user equipments
  • the interference of the small interval is the main factor that restricts the performance of the cell edge UE. Therefore, the joint scheduling can reduce the interference between cells, thereby improving the performance of the cell edge UE.
  • cell 1, cell 2, and cell 3 are neighbor cells, and UE1, UE2, and UE3 are all on the cell boundary. Through the joint scheduling of three cells, three UEs that may interfere with each other are scheduled to mutually orthogonal resources, thereby effectively avoiding interference between cells.
  • the joint scheduling scheme Different from the joint scheduling scheme, only one cell sends data to the UE.
  • multiple cells simultaneously transmit data to the UE to enhance the UE receiving signals.
  • three cells transmit data to one UE on the same resource, and the UE simultaneously receives signals of multiple cells.
  • the superposition of useful signals from multiple cells can improve the signal quality received by the UE, and on the other hand, reduce the interference experienced by the UE, thereby improving system performance.
  • Uplink joint reception means that multiple cells simultaneously receive data sent by one UE, and the data received by each cell is combined and combined to improve the demodulation quality of the UE data.
  • the scheme of uplink joint reception is shown in Figure 3.
  • the UE sends an uplink reference signal (SRS) on the time and frequency resources specified by the camping cell.
  • SRS uplink reference signal
  • the eNodeB estimates the channel information of the UE to the base station according to the SRS signal sent by the UE and the signal received by the eNodeB, and serves as a basis for uplink frequency domain scheduling, Modulation and Coding Scheme (MCS) selection, and resource allocation.
  • MCS Modulation and Coding Scheme
  • the eNodeB can calculate a weight vector of the downlink beamforming based on the obtained uplink channel information.
  • TDD time division duplex
  • LTE system The allocation of SRS resources is based on cells, and the resources of UEs in the small area are orthogonal to each other.
  • the SRS of one cell in the same subframe is orthogonal to the SRS resources by means of code division multiplexing.
  • the root sequence of each SRS is related to the cell ID.
  • the SRS of the neighboring cell may be configured to be transmitted in different subframes. In this case, the SRS in one cell is interfered by the data of the neighboring cell.
  • the SRS of the neighboring cell may be configured to be transmitted in the same subframe. In this case, if the SRS root sequences of the neighboring cells are different, the SRSs in these neighboring cells interfere with each other.
  • 3GPP TS 36.211, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8) please refer to "3GPP TS 36.211, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release
  • the plurality of cells refers to cells that may signal the CoMP UE using a coordinated multi-point transmission technique.
  • the SRS root sequence of each cell is obtained according to the cell ID (Cell ID).
  • Cell ID the cell ID
  • the root sequence number of the SRS may be different.
  • the SRS of a CoMP UE in one cell may be interfered by SRS in another cell.
  • the CoMP UE sends the SRS signal to both the cell 1 and the cell 2, so that both the cell 1 and the cell 2 can estimate the channel quality of the CoMP UE to the local cell for coordinated multi-point transmission. If the SRS subframe configuration of cell 1 and cell 2 is different, the SRS in cell 1 interferes with the data transmission in cell 2. For example, a CoMP UE sends a SRS to the cell 1 using the root sequence J'J C1.
  • SINR Signal to Interference plus Noise Ratio
  • P SRS is the power of the SRS of the CoMP UE received by the cell 1
  • Pda ta is the data of the cell 2 in the cell. 1 kind of interference power generated, N. Is the AWGN noise power.
  • the SRS of the CoMP UE in the cell 2 may also be interfered by the data in the cell 1.
  • SINR PSRS, 1 1 (PSRS, 2 * d + N.).
  • the PSRW is the power of the SRS of the CoMP UE received by the cell 1
  • the P SRS , 2 is the power of the SRS of the UE in the cell 2 received by the cell 1
  • d is the correlation coefficient of the SRS root sequence C1 and C2, Hey. Is the AWGN noise power.
  • the SRS of the CoMP UE in the cell 2 may also be interfered by the SRS of the UE in the cell 1.
  • an object of the present invention is to provide a method and apparatus for configuring SRS for coordinated multi-point transmission, which can reduce mutual interference of inter-cell SRS signals using multi-point coordinated transmission technology.
  • An embodiment of the present invention provides a method for configuring an SRS for coordinated multi-point transmission, including the following steps:
  • the SRS resource of the UE is orthogonal to the SRS resource of the other user equipment UE that has been configured in the cell set A;
  • At least one cell in the cell set B sends the SRS resource configuration information to the CoMP UE, where the SRS resource configuration information is used to describe the configuration in the cell set B.
  • SRS resources of CoMP UEs SRS resources of CoMP UEs.
  • Another embodiment of the present invention provides a method for configuring an SRS for coordinated multi-point transmission, including the following steps:
  • the multi-point coordinated transmission user equipment CoMP UE receives the SRS resource configuration information of the CoMP UE in the cell set B from at least one of the subset B of the cell set A; the SRS resource described in the SRS resource configuration information Orthogonal to the SRS resources of other configured user equipment UEs in the cell set A;
  • the CoMP UE sends an SRS according to the received SRS resource configuration information.
  • a further embodiment of the present invention provides a base station device, the base station device belonging to a subset B of a small set A, the base station comprising:
  • the configuration unit 1 is configured to: perform the interworking information with the cell in the cell set B or configure the SRS resource for the cell in the cell set B of the CoMP UE according to the convention; and the SRS resource and the cell of the CoMP UE configured in the cell set B
  • the SRS resources of other user equipment UEs configured in the set A are orthogonal; the cell set B is a subset of the cell set A;
  • the configuration unit 2 is configured to send the SRS resource configuration information to the CoMP UE, where the SRS resource configuration information is used to describe the SRS resource of the CoMP UE configured by the configuration unit in the cell set B.
  • the embodiment of the present invention further provides a multi-point coordinated transmission user equipment CoMP UE, including: a receiving unit 1 configured to receive, according to at least one cell in a subset B of a cell set A, the CoMP UE in the cell set B. SRS resource configuration information; the SRS resource in the SRS resource configuration information is orthogonal to the SRS resources of other configured user equipment UEs in the cell set A;
  • the sending unit sends the SRS according to the received SRS resource configuration information.
  • the SRS configurations of the CoMP UEs are coordinated in the CoMP Cell set, which can reduce the SRS signal interference between the CoMP cells, and enhance the information.
  • the accuracy of the channel estimation improves system performance.
  • FIG. 1 is a schematic diagram of a joint scheduling of a CoMP Cell in the prior art
  • FIG. 2 is a schematic diagram of a CoMP Cell implementing joint transmission in the prior art
  • FIG. 3 is a schematic diagram of a CoMP Cell implementing uplink joint reception in the prior art
  • FIG. 4 is a flowchart of an SRS configuration according to an embodiment of the present invention. Mode for carrying out the invention
  • the core technical features of the solution of the present invention include: multiple coordinated transmission cells of one CoMP UE communicate with each other, and when the CoMP UE is configured with SRS resources in the multiple coordinated cells, the CoMP UE is reduced by another UE (CoMP UE or The interference of the SRS of the non-CoMP UE increases the SINR of the SRS of the CoMP UE, thereby obtaining a better coordinated transmission effect.
  • the flow of the embodiment of the present invention is as shown in FIG. 4, and includes the following steps:
  • Step 401 The cell interworking information in one subset B of the cell set A or the SRS resource configured in the cell in the cell set B by the multi-point coordinated transmission user equipment CoMP UE according to the convention; the SRS of the CoMP UE The resource is orthogonal to the SRS resources of other user equipment UEs that have been configured in the cell set A;
  • Step 402 At least one cell in the cell set B sends the SRS resource configuration information of the CoMP UE in the cell set B to the CoMP UE.
  • one cell a in the coordinated transmission cell of one CoMP UE configures the SRS resource in the cell for the CoMP UE.
  • the cell a notifies the other cell b of the SRS resource configuration information of the CoMP UE in the local cell (for example, another association of the CoMP UE) A cell or a neighboring non-cooperating cell of the CoMP UE).
  • the notified cell b configures the SRS resource for its UE (CoMP UE or non-CoMP UE)
  • only the SRS resource orthogonal to the SRS of the CoMP UE in the cell a is used.
  • the orthogonal SRS resources can be obtained by, but not limited to, time division multiplexing, frequency division multiplexing, code division multiplexing, or a combination thereof.
  • the SRS resources include, but are not limited to, frequency domain resources of the SRS, sequence root sequence numbers of the SRS, cyclic shift of the SRS sequence, and/or time domain resources of the SRS.
  • one cell a in the coordinated transmission cell of one CoMP UE is the CoMP UE configured with SRS resources in the local cell.
  • the cell a informs the other cell b (e.g., another co-cell of the CoMP UE or a neighboring non-cooperating cell of the CoMP UE) that the CoMP UE has in the SRS resource configuration information of the local cell.
  • the notified cell b reduces the use of SRS resources that are non-orthogonal to the SRS of the CoMP UE in the cell a when configuring the SRS resource for its UE (CoMP UE or non-CoMP UE).
  • cell b can still use SRS resources that are non-orthogonal to the SRS of the CoMP UE in cell a.
  • the cell B uses the received SRS resource configuration information of the CoMP UE in the cell a, and uses the SRS resource orthogonal to the SRS of the CoMP UE in the cell a.
  • the SRS resources of one CoMP UE in its coordinated transmission cell are the same.
  • the SRS resource of the CoMP UE is orthogonal to the SRS resource of another UE (CoMP UE or non-CoMP UE).
  • the orthogonal SRS resources can be obtained by, but not limited to, time division multiplexing, frequency division multiplexing, code division multiplexing, or a combination thereof.
  • the SRS of the CoMP UE may use different root sequences, different cyclic shifts, different time domain resources, disjoint frequency domain resources, or a combination thereof with other UEs (CoMP UEs or non-CoMP UEs) SRSs. .
  • the SRS resources of one CoMP UE in its coordinated transmission cell are different.
  • Multiple SRS resources of the CoMP UE with other UEs (CoMP UE or The SRS resources of non-CoMP UEs are orthogonal.
  • the orthogonal SRS resources can be obtained by, but not limited to, time division multiplexing, frequency division multiplexing, code division multiplexing, or a combination thereof.
  • the SRS of the CoMP UE may use different root sequences, different cyclic shifts, different time domain resources, disjoint frequency domain resources, or a combination thereof, with SRSs of other UEs (CoMP UEs or non-CoMP UEs).
  • the multiple SRS resources of the CoMP UE in its coordinated transmission cell may be orthogonal or non-orthogonal.
  • the multiple SRS resources of the CoMP UE in its coordinated transmission cell may be orthogonal.
  • the coordinated transmission cells of one CoMP UE communicate with each other, and the SRS resources of the coordinated transmission cell are configured for the CoMP UE.
  • the SRS resources of the CoMP UE in the coordinated transmission cell may be the same or different.
  • the SRS resources of the CoMP UE in the coordinated transmission cell may be orthogonal to the SRS resources of other UEs in the coordinated transmission cell, or may be non-orthogonal.
  • the SRS resource of the CoMP UE in the coordinated transmission cell is orthogonal to the SRS resource of another UE in the coordinated transmission cell.
  • each CoMP Cell is configured with one orthogonal frequency division multiplexing.
  • a set M of Orthogonal Frequency Division Multiplexing (OFDM) symbols characterized in that the SRS of the CoMP UE can only be transmitted on the OFDM symbols in the set M.
  • the OFDM symbols in the set M are referred to as CoMP SRS OFDM symbols.
  • the SRS of the non-CoMP UE may be allocated in the CoMP SRS OFDM symbol or may be allocated in another OFDM symbol.
  • SRS resources include, but are not limited to, SRS root sequence number, SRS transmission band, Cyclic Shift (CS), and the like.
  • the CoMP SRS OFDM symbol set M records a set of OFDM symbols that may be allowed to be used by the CoMP UE to transmit SRS.
  • its SRS can be configured on a subset of the CoMP SRS OFDM symbol set M.
  • Multiple CoMP Cells can also interwork messages to determine the same CoMP SRS OFDM symbol set ⁇ [.
  • a common set thereof may be taken as the same CoMP SRS OFDM symbol set M on multiple CoMP cells, characterized in that CoMP The UE can only send the SRS on the common set M.
  • Multiple CoMP cells may also determine an identical CoMP SRS OFDM symbol set according to some convention.
  • the CoMP SRS OFDM symbol set of each cell may be the same or different. However, in order to achieve a better implementation effect, the CoMP SRS OFDM symbol sets of the respective cells are the same in order to save SRS resources.
  • the SRS OFDM symbol set M for each cell may be sent by the network to each CoMP UE.
  • the relevant configuration information can be placed in the broadcast channel or notified to the CoMP UE through higher layer signaling.
  • the UE may obtain the configuration information from its anchor cell, or may obtain the configuration information from another CoMP cell.
  • the configuration information of the CoMP SRS OFDM symbol is fixed and directly configured in the UE, and the network does not need to send the configuration information.
  • Each CoMP cell is configured as a CoMP UE to configure SRS resources in the cell.
  • each CoMP Cell configures the SRS of the CoMP UE on one SRS OFDM symbol set W, characterized in that the SRS OFDM symbol set W is a subset of the CoMP SRS OFDM symbol set M or M.
  • the set of SRS OFDM symbols that different CoMP cells can configure for the CoMP UE can be different.
  • the SRS OFDM symbol set W that different CoMP cells can configure for the CoMP UE may also be the same.
  • the CoMP UE receives resource configuration information of the SRS from at least one of the CoMP cells, including the OFDM symbol set in which the CoMP UE can use the SRS.
  • the CoMP UE transmits the SRS according to the received SRS resource configuration information.
  • the cooperative transmission cells may also communicate with each other to jointly determine a set of OFDM symbols for transmitting a SRS for a CoMP UE, characterized in that the SRS OFDM symbol set W is a subset of the CoMP SRS OFDM symbol set M or M.
  • the CoMP UE receives resource configuration information of the SRS from at least one of the CoMP cells, including the OFDM symbol set W that the CoMP UE can use to transmit the SRS.
  • the CoMP UE transmits the SRS according to the received SRS resource configuration information.
  • the SRS root sequence numbers of the CoMP UEs of the respective cells may be the same or different.
  • the SRS root sequence numbers of the CoMP UEs of the respective cells are the same, so as to save SRS resources.
  • the configuration information about the SRS root sequence of the CoMP UE of each cell may be sent by the network to each CoMP UE.
  • the relevant configuration information can be placed in the broadcast channel or notified to the CoMP UE through higher layer signaling.
  • the UE may obtain the configuration information from its camped cell, or may acquire the configuration information from another CoMP Cell.
  • the configuration information of the SRS root sequence of the CoMP UE is fixed, and is directly configured in the UE, and the network does not need to send the configuration information.
  • the SRS root sequence of the CoMP UE may be the same as or different from the SRS root sequence of the non-CoMP UE.
  • the SRS root sequence of the CoMP UE and the SRS root sequence of the non-CoMP UE are different, so as to save SRS resources.
  • the multi-point coordinated transmission cell mentioned in this embodiment refers to a cell that may transmit a CoMP UE by using a multi-point coordinated transmission technology, and is called a CoMP CelL of the CoMP UE.
  • a corresponding CoMP Cell may be different or it may be the same.
  • the invention in this embodiment can be extended to an uplink reference signal cell group supporting a multipoint coordinated transmission technology, which is called a CoMP SRS Cluster.
  • the CoMP SRS Cluster is a set of cells in which the same CoMP SRS OFDM symbol set M is configured. Further, the cell in this CoMP SRS Cluster The SRS root sequence of the configured CoMP UE is also the same.
  • the CoMP SRS Cluster can contain the same cell as the CoMP Cell of a particular CoMP UE.
  • the CoMP SRS Cluster may also contain more cells than the CoMP Cell of a particular CoMP UE.
  • the CoMP SRS Cluster consists of cells 1, 2, 3, and 4. For CoMP UE1, its CoMP Cell includes Cell 1, Cell 2, and Cell 3.
  • CoMP UE2 its CoMP Cell may include cell 2, cell 3, and cell 4. Since both UE 1 and UE 2 are in the same CoMP SRS Cluster, their SRS OFDM symbols are a subset of the CoMP SRS OFDM symbol set M. The SRS root sequences of CoMP UE 1 and CoMP UE 2 may also be the same.
  • a CoMP Cell of a CoMP UE may also include a cell other than the CoMP SRS Cluster. If the camped cell of the CoMP UE is within the CoMP SRS Cluster, the SRS of the CoMP UE may be configured to be transmitted on a subset of the CoMP SRS OFDM symbol set M.
  • Set the cell set A to be a CoMP SRS group, and the cells in the cell set A communicate with each other, or determine the same CoMP SRS OFDM symbol set M by a pre-configured manner.
  • the SRS of the CoMP UE can only be allocated on the OFDM symbols in these CoMP SRS OFDM symbol sets M.
  • the camped cell of the CoMP UE belongs to cell set A.
  • Each cell in cell set A communicates with each other, or through an agreement, determines the SRS root sequence of the same CoMP UE.
  • the CoMP UE's SRS can only use this CoMP SRS root sequence.
  • the orthogonal SRS resources can be obtained by time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), or any combination of the above.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • One or more cells in the cell set A may jointly determine the SRS resources of one CoMP UE by means of interworking information. For example, two cells jointly determine an SRS resource: Cell 1 determines an optional SRS resource of UE1, and determines the SRS.
  • the resource information is sent to the cell 2; the cell 2 selects one SRS resource from the optional SRS resource of the UE1 as the SRS resource of the UE1 according to the received resource information and the SRS resource allocated by the cell according to the orthogonal principle, and The SRS resource information is returned to the cell 1.
  • the SRS resources may include, but are not limited to, SRS transmission time, frequency domain resources, root sequence numbers, and cyclic shifts.
  • One or more cells in the cell set A notify the SRS resources allocated by each CoMP UE through higher layer signaling.
  • Set the cell set A to be a CoMP SRS group, in which each cell is assigned the same CoMP SRS OFDM symbol set M.
  • the SRS of the CoMP UE can only be allocated in these CoMP SRS OFDM symbols.
  • SRSs of non-CoMP UEs may also be allocated in these CoMP SRS OFDM symbols.
  • the anchor cell of the CoMP UE belongs to the cell set A.
  • Cell Set A allocates the SRS root sequence of at least two CoMP UEs.
  • the SRS of the CoMP UE can only use the SRS root sequence of the CoMP UE as described above.
  • Orthogonal SRS resources can be obtained by TDM, FDM, CDM or a combination thereof.
  • One or more cells in the cell set A may jointly determine the SRS resources of one CoMP UE by means of interworking information.
  • SRS resources may include, but are not limited to, SRS transmission time, frequency domain resources, root sequence number, and cyclic shift.
  • the cell determines whether the root sequences of any two CoMP UEs are the same. If their SRS root sequences are different, the SRS resources of the two CoMP UEs are allocated at different times (for TDM systems) or different frequency domains ( Applicable to FDM systems).
  • Cell Set One or more cells in A notify the SRS resources allocated by each CoMP UE through higher layer signaling.
  • P SRS is the received power of the SRS received by the cell 1 of the CoMP UE
  • N 0 is the AWGN noise power.
  • the SINR of the SRS signal received by the cell 2 for the CoMP UE can be similarly calculated. It can be seen that after employing the present invention, the SINR of the SRS is improved over the prior art.
  • the SINR of the SRS directly affects the accuracy of the channel estimation generated by the SRS. The higher the SINR of the SRS, the better the channel estimation quality produced by the SRS. Therefore, the present invention can improve the performance of channel estimation of SRS. It is noted that while the cell 1 receives the CoMP UE SRS, the cell 2 can also receive the SRS of the CoMP UE to estimate the channel of the CoMP UE to the cell 2, so as to perform CoMP transmission.
  • Cell 1 and Cell 2 can use different SRS root sequences.
  • the cell 2 does not transmit the SRS, or any other signal, at the same time. This can reduce SRS interference, enhance the SINR of the SRS, and obtain better channel estimation.
  • the cell 2 can receive the SRS of the CoMP UE to estimate the channel of the CoMP UE to the cell 2, so as to perform CoMP transmission.
  • the OFDM symbols specified in the CoMP SRS OFDM symbol configuration table in the present invention may be located in a normal subframe or a special subframe.
  • the normal subframe may be any subframe in a frequency division duplex (FDD) system, or a normal uplink subframe of TDD.
  • the special subframe may be a TDD special subframe UpPTS.
  • 3GPP LTE FDD at most one OFDM symbol on one subframe can be used for SRS transmission.
  • 3GPP LTE TDD at most one OFDM symbol can be used for SRS transmission on a normal subframe.
  • In 3GPP LTE TDD in The uplink pilot time slot (on the UpPTS) in the special subframe may have multiple OFDM symbols for SRS transmission.
  • the CoMP SRS OFDM symbol set M can be extended to one subframe set.
  • the set of subframes may be referred to as a CoMP SRS subframe set, characterized in that the SRS of the CoMP UE can only be transmitted in the subframe set.
  • the CoMP SRS symbol set and the CoMP SRS subframe set are not distinguished.
  • one or more cells in a coordinated transmission cell of a CoMP UE transmit the SRS configuration of the CoMP UE in the coordinated transmission cell to the CoMP UE.
  • the SRS configuration information of the CoMP UE may be separately transmitted through the camping cell of the CoMP UE, or may be jointly transmitted by the camped cell of the CoMP UE and another coordinated transport cell, or transmitted by each coordinated transmission cell.
  • Other SRS resource configuration transmission methods are not excluded.
  • the present invention takes an OFDM system as an example, and the OFDM symbol serves as a time-frequency resource for configuring an SRS signal.
  • the present invention can be applied to a non-OFDM system, and the time-frequency resource for configuring the SRS signal is a transmission interval.
  • the present invention takes an example of SRS based on code division multiplexing CDM.
  • the present invention can be applied to other SRS transmission methods, including but not limited to FDM-based SRS, FDM/CDM-based SRS, and the like.
  • the present invention takes a time domain as an example, and considers a CoMP SRS OFDM symbol, which is characterized in that the SRS of the CoMP UE can only be transmitted in these CoMP SRS OFDM symbols.
  • the present invention can be extended to a frequency domain, and some CoMP SRS OFDM resource elements (Resource Elements) are reserved in the frequency domain, which is characterized in that the SRS of the CoMP UE can only be sent on these CoMP SRS OFDM resource elements.
  • a resource element refers to a certain spectrum resource. In 3GPP LTE, the frequency range of one resource element is 15KHz. CoMP SRS OFDM resource elements can be evenly distributed across the system bandwidth.

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Abstract

本发明公开了一种用于多点协同传输的上行参考信号(SRS)的配置方法,包括如下步骤:一个小区集合A中的一个子集B中的小区互通信息或者按照约定,为一个多点协同传输用户设备CoMP UE在小区集合B中的小区配置SRS资源;所述在小区集合B中配置的 CoMP UE的SRS资源与小区集合A中已配置的其它用户设备UE的SRS资源正交;小区集合B中的至少一个小区将SRS资源配置信息发送给所述CoMP UE,所述SRS资源配置信息用于描述所述在小区集合B中配置的CoMP UE的SRS资源。本发明还公开了用于配置多点协同传输的SRS的装置。

Description

一种用于多点协同传输的上行参考信号的配置方法和装置 技术领域
本发明涉及第三代移动通信技术领域, 特别涉及一种用于多点协同 传输 ( Coordinated Multi-Point Transmission )的上行参考信号 ( Sounding Reference Signal, SRS)的配置方法和装置。 发明背景
国际电信联盟 ( International Telecommunication Union, ITU ) 为下 一代移动通信系统( IMT-Advanced )的性能提出了非常苛刻的要求。 比 如最大系统传输带宽达到 100MHz, 上下行数据传输的峰值速率需要达 到 lGbps和 500M bps,并对系统平均频谱效率尤其是边缘频谱效率提出 了非常高的需求。 为了满足 IMT-Advanced新系统的要求, 3GPP在其下 一代移动蜂窝通信系统——长期演进项目的升级系统( LTE-Advanced ) 中提出了采用多点协同传输技术来提高系统的性能。 为方便表述, 以下 将参与多点协同传输技术的用户设备称为 CoMP UE,而没有参与多点协 同传输技术的用户设备称为非 CoMP UE;相应地,采用了多点协同传输 技术的小区称为 CoMP Cell, 或者筒称为协同小区。 对于不同的 CoMP UE, 对应的 CoMP Cells可能是不同的, 也可能是相同的。
无论是 CoMP UE还是非 CoMP UE, 每个 UE都有一个驻留小区。 非 CoMP UE的驻留小区可以是它的服务小区( serving cell )。非 CoMP UE 可以从它的驻留小区接收控制信息和数据。 CoMP UE从它的驻留小区接 收控制信息。 CoMP UE可以从它的驻留小区和 /或协同小区接收数据。
多点协同传输技术是通过地理位置上分离的多个传输点之间的协 作, 实现收发数据或信令的移动传输技术。 多个传输点可以是不同小区 的基站 ( eNodeB )。 多点协同传输技术分下行的协同传输和上行的联合 接收。下行多点协同传输技术方案主要分为两类:联合调度和联合发送。 联合调度是通过小区之间的时间、 频率和空间资源的协调, 为不同的用 户设备 ( UE )分配互相正交或者准正交的资源, 避免相互之间的干扰。 而联合发送则是多个小区的基站同时向同一个 UE发送数据。
小区间的干扰是制约小区边缘 UE性能的主要因素, 因此联合调度 可以降低小区间的干扰, 从而提高小区边缘 UE的性能。 如图 1所示, 小区 1、 小区 2和小区 3为相邻小区, UE1、 UE2和 UE3都处于小区边 界上。 通过 3个小区的联合调度, 将可能会相互干扰的三个 UE调度了 到相互正交的资源上, 有效的避免了小区之间的干扰。
与联合调度方案只有一个小区向 UE发送数据不同, 联合发送方案 中有多个小区同时向 UE发送数据, 以增强 UE接收信号。 如图 2所示, 三个小区在相同的资源上向一个 UE发送数据, UE同时接收多个小区的 信号。 一方面, 来自多个小区的有用信号叠加可以提升 UE接收的信号 质量, 另一方面, 降低了 UE受到的干扰, 从而提高系统性能。
上行联合接收是指多个小区同时接收一个 UE发出的数据, 各小区 接收到的数据再进行合并, 通过这种联合处理以提高 UE数据的解调质 量。 上行联合接收的方案如图 3所示。
LTE 系统中, UE在其驻留小区指定的时间和频率资源上发送上行 参考信号 (Sounding Reference Signal, SRS)。 eNodeB根据 UE发送的 SRS信号和 eNodeB接收到的信号估计出 UE到基站的信道信息, 作为 上行频域调度、 调制编码方式( Modulation and Coding Scheme, MCS ) 选择和资源分配的依据。 例如对于时分双工 (TDD ) 系统, eNodeB 可 以根据得到的上行信道信息计算下行波束赋形的加权向量。 LTE 系统 SRS资源的分配是以小区为单位, 小区内 UE的资源之间正交。 LTE系 统中, 一个小区在同一个子帧中的 SRS用码分复用的方式使 SRS资源 正交。 每个 SRS的根序列和小区标识 (cell ID)有关。 相邻小区的 SRS可 能会配置在不同的子帧内传输。 在这种情况下, 一个小区内的 SRS会受 到邻小区的数据的干扰。相邻小区的 SRS可能会配置在相同的子帧内传 输。 在这种情况下, 如果相邻小区的 SRS根序列不同, 这些相邻小区内 的 SRS 会互相干扰。 相关的具体内容可参阅" 3GPP TS 36.211, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)。 "
对于 CoMP UE而言, 它需要对多个小区进行信道探测。 所述多个 小区指的是可能会使用多点协同传输技术对该 CoMP UE进行信号传输 的小区。 在 LTE系统中, 每个小区的 SRS根序列号 ( Root Sequence ) 是根据小区标识(Cell ID )得到的。 在不同的小区中, SRS的根序列号 可能会不一样。考虑到每个小区中会存在 CoMP UE和非 CoMP UE共存 的情况, 比如说 LTE UE, CoMP UE在一个小区中的 SRS可能会被别的 小区中的 SRS 干扰。
假设小区 1和小区 2的 SRS的根序列号不同, 分别为 C1和 C2。 CoMP UE要向小区 1和小区 2中都发送 SRS信号,以便小区 1和小区 2 都能估测该 CoMP UE到本小区的信道质量, 用于多点协同传输。 如果 小区 1和小区 2的 SRS子帧配置不一样, 那么小区 1中的 SRS会和小 区 2中的数据传输互相干扰。 比如说, 某个 CoMP UE要向小区 1用根 序歹 'J C1发送 SRS。小区 1中的 SRS的信噪比( Signal to Interference plus Noise Ratio, SINR)可以表示为 SINR = PSRS / (Pdata + N。)。 这里 PSRS是小 区 1接收到的该 CoMP UE的 SRS的功率, Pdata是小区 2的数据在小区 1种产生的干扰功率, N。是 AWGN噪声功率。 相应地, 该 CoMP UE在 小区 2中的 SRS也可能受到小区 1中的数据的干扰。
在现有技术中, 如果小区 1和小区 2在某个子帧上都配置了 SRS, 由于小区 1和小区 2的 SRS根序列不同,那么小区 1的 SRS会和小区 2 的 SRS产生干扰。 比如, 某个 CoMP UE要向小区 1用根序列 C1发送 SRS。 在同一个 SRS OFDM符号上, 小区 2可能会有 UE用根序列 C2 发送 SRS。这样,该 CoMP UE在小区 1的 SRS的 SINR可以表示为 SINR = PSRS, 1 1 (PSRS,2 * d + N。)。这里 , PSRW是小区 1接收到的该 CoMP UE的 SRS的功率, PSRS,2是小区 1接收到的小区 2中的 UE的 SRS的功率, d 是 SRS根序列 C1和 C2—个相关系数,Ν。是 AWGN噪声功率。相应地, 该 CoMP UE在小区 2中的 SRS也可能受到小区 1中的 UE的 SRS的干 扰。 发明内容
有鉴于此, 本发明的目的在于, 提出一种用于多点协同传输的 SRS 的配置方法和装置,可以减小采用多点协同传输技术的小区间 SRS信号 的相互干扰。 本发明实施例提出了一种用于多点协同传输的 SRS的配置方法,包 括如下步骤:
一个小区集合 A中的一个子集 B中的小区互通信息或者按照约定, 为一个多点协同传输用户设备 CoMP UE在小区集合 B 中的小区配置 SRS资源; 所述在小区集合 B中配置的 CoMP UE的 SRS资源与小区集 合 A中已配置的其它用户设备 UE的 SRS资源正交;
小区集合 B 中的至少一个小区将 SRS 资源配置信息发送给所述 CoMP UE, 所述 SRS资源配置信息用于描述所述在小区集合 B中配置 的 CoMP UE的 SRS资源。
本发明另一实施例提出一种用于多点协同传输的 SRS的配置方法, 包括如下步骤:
多点协同传输用户设备 CoMP UE从一个小区集合 A中的一个子集 B中的至少一个小区接收该 CoMP UE在小区集合 B中的 SRS资源配置 信息; 所述 SRS资源配置信息中描述的 SRS资源与小区集合 A中其它 已配置的用户设备 UE的 SRS资源正交;
所述 CoMP UE根据所收到的 SRS资源配置信息发送 SRS。
本发明的又一实施例提出一种基站设备, 所述基站设备属于一个小 区集合 A的一个子集 B, 该基站包括:
配置单元一, 用于与小区集合 B中的小区互通信息或者按照约定, 为一个 CoMP UE在小区集合 B中的小区配置 SRS资源; 所述在小区集 合 B中配置的 CoMP UE的 SRS资源与小区集合 A中已配置的其它用户 设备 UE的 SRS资源正交; 小区集合 B是小区集合 A的子集;
配置单元二,用于向该 CoMP UE发送 SRS资源配置信息,所述 SRS 资源配置信息用于描述所述配置单元一在小区集合 B 中配置的 CoMP UE的 SRS资源。
本发明实施例还提出一种多点协同传输用户设备 CoMP UE, 包括: 接收单元一,用于从一个小区集合 A中的一个子集 B中的至少一个 小区接收该 CoMP UE在小区集合 B中的 SRS资源配置信息; 所述 SRS 资源配置信息中的描述 SRS资源与小区集合 A中其它已配置的用户设 备 UE的 SRS资源正交;
发送单元, 根据所收到的 SRS资源配置信息发送 SRS。
从以上技术方案可以看出, CoMP UE的 SRS配置在 CoMP Cell集 合中是互相协调的, 可以减小 CoMP Cell之间的 SRS信号干扰, 增强信 道估计的准确度, 提高系统性能。 附图简要说明
图 1为现有技术中 CoMP Cell实现联合调度的示意图;
图 2为现有技术中 CoMP Cell实现联合发送的示意图;
图 3为现有技术中 CoMP Cell实现上行联合接收的示意图; 图 4为本发明实施例的 SRS配置流程图。 实施本发明的方式
为使本发明的目的、 技术方案和优点更加清楚, 下面结合附图对本 发明作进一步的详细阐述。
本发明方案的核心技术特征包括: 一个 CoMP UE的多个协同传输 小区互相通信,在给该 CoMP UE在该多个协同小区中配置 SRS资源时, 减少该 CoMP UE受到别的 UE (CoMP UE或者非 CoMP UE)的 SRS的干 扰, 提高该 CoMP UE的 SRS的 SINR, 从而得到更好的协同传输效果。
本发明实施例的流程如图 4所示, 包括如下步骤:
步骤 401 : —个小区集合 A中的一个子集 B中的小区互通信息或者 按照约定, 为一个多点协同传输用户设备 CoMP UE在小区集合 B中的 小区配置 SRS资源; 所述 CoMP UE的 SRS资源与小区集合 A中已配置 的其它用户设备 UE的 SRS资源正交;
步骤 402: 小区集合 B中的至少一个小区将所述 CoMP UE在小区 集合 B中的 SRS资源配置信息发送给所述 CoMP UE。
在一种实施例中, 一个 CoMP UE的协同传输小区中的一个小区 a 为该 CoMP UE在本小区中配置 SRS资源。 该小区 a将该 CoMP UE在 本小区的 SRS资源配置信息通知别的小区 b (例如该 CoMP UE的别的协 作小区或者该 CoMP UE的邻近的非协作小区)。 被通知的小区 b在给它 的 UE(CoMP UE或者非 CoMP UE)配置 SRS资源时, 只采用与该 CoMP UE在小区 a中的 SRS正交的 SRS资源。正交的 SRS资源可以通过但是 不局限于时分复用, 频分复用,码分复用,或者其组合的方式得到。 SRS 资源包括但不局限于 SRS的频域资源、 SRS的序列根序号、 SRS序列的 循环移位和 /或 SRS的时域资源。
在另一种实施例中,一个 CoMP UE的协同传输小区中的一个小区 a 为该 CoMP UE在本小区中配置 SRS资源。 该小区 a将该 CoMP UE在 本小区的 SRS资源配置信息通知别的小区 b (例如该 CoMP UE的别的协 作小区或者该 CoMP UE的邻近的非协作小区)。 被通知的小区 b在给它 的 UE(CoMP UE或者非 CoMP UE)配置 SRS资源时,减少使用与该 CoMP UE在小区 a中的 SRS非正交的 SRS资源。 也就是说, 小区 b还是可以 使用与该 CoMP UE在小区 a中的 SRS非正交的 SRS资源。 但是小区 b 在给它的 UE配置 SRS资源时, 使用接收到的该 CoMP UE在小区 a中 的 SRS资源配置信息,尽量使用与该 CoMP UE在小区 a中的 SRS正交 的 SRS资源。
在另一种实施例中, 一个 CoMP UE在它的协同传输小区中的 SRS 资源是一样的。 该 CoMP UE的 SRS资源与别的 UE(CoMP UE或者非 CoMP UE)的 SRS资源是正交的。 正交的 SRS资源可以通过但是不局限 于时分复用, 频分复用, 码分复用, 或者其组合的方式得到。 例如, 该 CoMP UE的 SRS可以和别的 UE(CoMP UE或者非 CoMP UE)的 SRS使 用不同的根序列, 不同的循环移位, 不同的时域资源, 不相交的频域资 源, 或者其组合。
在另一种实施例中, 一个 CoMP UE在它的协同传输小区中的 SRS 资源是不同的。该 CoMP UE的多个 SRS资源与别的 UE(CoMP UE或者 非 CoMP UE)的 SRS资源是正交的。正交的 SRS资源可以通过但是不局 限于时分复用, 频分复用, 码分复用, 或者其组合的方式得到。 例如, 该 CoMP UE的 SRS可以和别的 UE(CoMP UE或者非 CoMP UE)的 SRS 使用不同的根序列, 不同的循环移位, 不同的时域资源, 不相交的频域 资源, 或者其组合。 该 CoMP UE在它的协同传输小区中的多个 SRS资 源可以是正交的, 也可以是非正交的。 较佳的, 该 CoMP UE在它的协 同传输小区中的多个 SRS资源可以是正交的。
在另一种实施例中, 一个 CoMP UE的协同传输小区互相通信, 共 同为该 CoMP UE配置在所述协同传输小区的 SRS资源。 该 CoMP UE 在所述协同传输小区的 SRS 资源可以使相同的, 也可以是不同的。 该 CoMP UE在所述协同传输小区的 SRS资源可以与在所述协同传输小区 内别的 UE的 SRS资源是正交的,也可以是非正交的。较佳的,该 CoMP UE在所述协同传输小区的 SRS资源与在所述协同传输小区内别的 UE 的 SRS资源是正交的。
在另一种实施例中, 每个 CoMP Cell 配置一个正交频分复用
( Orthogonal Frequency Division Multiplexing, OFDM )符号的集合 M, 其特征在于, CoMP UE的 SRS只能在这些所述集合 M中的 OFDM符 号上发送。所述集合 M中的 OFDM符号称之为 CoMP SRS OFDM符号。 非 CoMP UE的 SRS可以被分配在所述 CoMP SRS OFDM符号中,也可 以被分配在别的 OFDM符号中。 SRS资源包括但不局限于 SRS根序列 号, SRS传输频带,循环移位( Cyclic Shift, CS )等等。
所述的 CoMP SRS OFDM符号集合 M记录了可以允许被使用为 CoMP UE发送 SRS的 OFDM符号的集合。 对于某一个 CoMP UE, 它 的 SRS可以被配置在 CoMP SRS OFDM符号集合 M中的一个子集上。
多个 CoMP Cell可以互通消息, 告知对方自己设定的 CoMP SRS OFDM符号集合^[。
多个 CoMP Cell 也可以互通消息, 确定一个相同的 CoMP SRS OFDM符号集合^[。 例如, 在多个 CoMP Cell各自设定的 CoMP SRS OFDM符号集合不相同的情况下, 可以取它们的公共集合, 作为在多个 CoMP Cell上相同的 CoMP SRS OFDM符号集合 M,其特征在于, CoMP UE只能在所述公共集合 M上发送 SRS。
多个 CoMP Cell也可以按照某种约定, 确定一个相同的 CoMP SRS OFDM符号集合。
各个小区的 CoMP SRS OFDM符号集合可以是相同的,也可以是不 同的。 但为了达到较佳实施效果, 各个小区的 CoMP SRS OFDM符号 集合是相同的, 以便节约 SRS资源。
关于各个小区的 SRS OFDM符号集合 M, 可以由网络发给每个 CoMP UE。 有关的配置信息可以放在广播信道中, 也可以通过高层信令 通知给 CoMP UE。 UE可以从其驻留小区( anchor cell )获取该配置信息, 也可以从别的 CoMP Cell获取该配置信息。 或者, CoMP SRS OFDM符 号的配置信息是固定的, 直接配置在 UE中, 无需网络发送该配置信息。
每个协同传输小区 CoMP Cell为一个 CoMP UE在本小区内配置 SRS资源。具体地 ,每个 CoMP Cell将该 CoMP UE的 SRS配置在一个 SRS OFDM符号集合 W上, 其特征在于, SRS OFDM符号集合 W是 CoMP SRS OFDM符号集合 M或者 M的一个子集。 不同 CoMP Cell可 以给该 CoMP UE配置的 SRS OFDM符号集合 W可以是不同的。 不同 CoMP Cell可以给该 CoMP UE配置的 SRS OFDM符号集合 W也可以是 相同的。 该 CoMP UE从所述 CoMP Cell中的至少一个小区接收 SRS的 资源配置信息,包括该 CoMP UE可以使用发送 SRS的 OFDM符号集合。 该 CoMP UE按照接收到的 SRS资源配置信息发送 SRS。 协同传输小区也可以互相通信, 共同为一个 CoMP UE确定一个用 于发送 SRS的 OFDM符号集合 W, 其特征在于, SRS OFDM符号集合 W是 CoMP SRS OFDM符号集合 M或者 M的一个子集。 该 CoMP UE 从所述 CoMP Cell中的至少一个小区接收 SRS的资源配置信息,包括该 CoMP UE可以使用发送 SRS的 OFDM符号集合 W。 该 CoMP UE按照 接收到的 SRS资源配置信息发送 SRS。
各个小区的 CoMP UE的 SRS根序列号可以是相同的, 也可以是不 同的, 较佳的, 各个小区的 CoMP UE的 SRS根序列号是相同的, 以便 节约 SRS资源。
关于各个小区的 CoMP UE的 SRS根序列的配置信息, 可以由网络 发给每个 CoMP UE。有关的配置信息可以放在广播信道中,也可以通过 高层信令通知给 CoMP UE。 UE可以从其驻留小区获取该配置信息, 也 可以从别的 CoMP Cell获取该配置信息。 或者, CoMP UE的 SRS根序 列的配置信息是固定的, 直接配置在 UE中, 无需网络发送该配置信息。
对于每个小区, CoMP UE的 SRS根序列可以和非 CoMP UE的 SRS 根序列相同, 也可以不同。较佳的, CoMP UE的 SRS根序列和非 CoMP UE的 SRS根序列是不同的, 以便节约 SRS资源。
本实施例中提到的多点协作传输小区是指可能会使用多点协同传 输技术对一个 CoMP UE进行信号传输的小区, 称之为该 CoMP UE的 CoMP CelL 对于不同的 CoMP UE, 对应的 CoMP Cell可能是不同的, 也可能是相同的。
本实施例中的发明可以拓展到一个支持多点协同传输技术的上行 参考信号小区组团,称之为 CoMP SRS组团( CoMP SRS Cluster )。 CoMP SRS Cluster是一个小区集合, 在这个集合里的小区配置了相同的 CoMP SRS OFDM符号集合 M。 更进一步, 这个 CoMP SRS Cluster里的小区 配置的 CoMP UE的 SRS根序列也是相同的。 CoMP SRS Cluster包含的 小区可以与某个特定 CoMP UE 的 CoMP Cell是一样的。 CoMP SRS Cluster也可以比特定 CoMP UE的 CoMP Cell包含更多的小区。 比如, CoMP SRS Cluster由小区 1, 2, 3 , 4组成。对于 CoMP UEl ,其 CoMP Cell 包括小区 1、 小区 2和小区 3。 对于 CoMP UE2, 其 CoMP Cell可以包括 小区 2、小区 3和小区 4。由于 UE 1和 UE 2都在同一个 CoMP SRS Cluster 中, 它们的 SRS OFDM符号都是 CoMP SRS OFDM符号集合 M的子 集。 CoMP UE 1和 CoMP UE 2的 SRS根序列也可以是一样的。
一个 CoMP UE的 CoMP Cell也可以包括所述 CoMP SRS Cluster以 外的小区。 如果所述 CoMP UE的驻留小区在 CoMP SRS Cluster之内, 那么该 CoMP UE的 SRS可以被配置在 CoMP SRS OFDM符号集合 M 的一个子集上发送。
具体实施例 1 :
1. 设置小区集合 A为 CoMP SRS组团, 小区集合 A中的小区互相 通信, 或者通过预先配置的方式, 确定相同的 CoMP SRS OFDM符号 集合 M。 CoMP UE的 SRS只能分配在这些 CoMP SRS OFDM符号集合 M中 OFDM符号上。 CoMP UE的驻留小区属于小区集合 A。
2. 小区集合 A中的每个小区互相通信, 或者通过一种约定, 确定 相同的 CoMP UE的 SRS根序列。 CoMP UE的 SRS只能使用这个 CoMP SRS根序列。
3. 为不同的 CoMP UE分配正交的 SRS资源。 正交的 SRS资源可 以通过时分复用 (TDM )、 频分复用 (FDM )、 码分复用 (CDM )或者 上述方式的任意组合得到。小区集合 A中的一个或者多个小区可以通过 互通信息的方式共同决定一个 CoMP UE的 SRS资源。 例如两个小区共 同确定 SRS资源: 小区 1确定 UE1可选的 SRS资源, 将所确定的 SRS 资源信息发送至小区 2; 小区 2根据所收到的资源信息以及本小区已分 配的 SRS资源, 根据正交的原则从 UE1可选的 SRS资源中挑选出一个 SRS资源作为 UE1的 SRS资源, 并将该 SRS资源信息返回小区 1。
SRS资源可以包括但不局限于 SRS的传输时间, 频域资源,根序列 号, 循环移位。
4.小区集合 A中的一个或者多个小区通过高层信令通知每个 CoMP UE所分配的 SRS资源。
具体实施例 2:
1. 设置小区集合 A为 CoMP SRS组团, 其中的每个小区, 分配相 同的 CoMP SRS OFDM符号集合 M。 CoMP UE的 SRS只能分配在这些 CoMP SRS OFDM符号中。非 CoMP UE的 SRS也可以分配在这些 CoMP SRS OFDM符号中。 CoMP UE的 anchor cell属于小区集合 A。
2. 小区集合 A分配至少两个 CoMP UE的 SRS根序列。 CoMP UE 的 SRS只能使用如上所述的 CoMP UE的 SRS根序列。
3. 为不同的 CoMP UE分配正交的 SRS资源。 正交的 SRS资源可 以通过 TDM, FDM, CDM或者其组合得到。 小区集合 A中的一个或者 多个小区可以通过互通信息的方式共同决定一个 CoMP UE的 SRS资 源。 SRS资源可以包括但不局限于 SRS的传输时间、 频域资源、 根序 列号和循环移位。
4. 小区判断任意两个 CoMP UE 的根序列是否相同, 如果它们的 SRS根序列不同,那么将这两个 CoMP UE的 SRS资源分配在不同的时 间 (适用于 TDM系统)或者不同的频域(适用于 FDM系统)上。
5.小区集合 A中的一个或者多个小区通过高层信令通知每个 CoMP UE所分配的 SRS资源。
具体实施例 3: 小区 1和小区 2的 CoMP SRS OFDM符号集合 M相同。更进一步, 小区 1和小区 2 将一个 CoMP UE的 SRS配置在相同的 OFDM符号上 发送。如果该 CoMP UE的 SRS资源与小区 1和小区 2中别的 UE的 SRS 资源正交(例如通过使用一个 SRS根序列的不同循环移位, 或者不同的 SRS频域资源,等等),该 CoMP UE在小区 1的 SRS的 SINR是 SINR = PSRS/N。。 这里 PSRS是小区 1收到该 CoMP UE的 SRS的接收功率, N0 是 AWGN噪声功率。 可以类似地计算小区 2收到该 CoMP UE的 SRS 信号的 SINR。 可以看到, 在采用本发明后, SRS的 SINR比现有技术提 高了。 SRS的 SINR直接影响到用 SRS产生的信道估计的准确度。 SRS 的 SINR越高, 用 SRS产生的信道估计质量越好。 所以本发明能够提高 SRS的信道估计的性能。注意到小区 1在接收该 CoMP UE SRS的同时, 小区 2也可以接收该 CoMP UE的 SRS, 用以估计该 CoMP UE到小区 2 的信道, 以便于做 CoMP传输。
在本发明中, 在 CoMP SRS OFDM符号上, 小区 1和小区 2可以 使用不同的 SRS根序列。 在这种情况下, 如果小区 1的 CoMP UE在发 送 SRS的时候, 小区 2在同一时间内不发送 SRS, 或者任何别的信号。 这样可以减小对 SRS干扰, 增强 SRS的 SINR, 得到更好的信道估计。 同时, 小区 2可以接收该 CoMP UE的 SRS, 用以估计该 CoMP UE到小 区 2的信道, 以便于做 CoMP传输。
本发明中的 CoMP SRS OFDM符号配置表中指定的 OFDM符号可 以位于正常子帧或特殊子帧中。 所述正常子帧可以是频分双工 (FDD ) 系统中任何子帧, 或者是 TDD 的正常上行子帧。 所述特殊子帧可以是 TDD特殊子帧 UpPTS。 在 3GPP LTE FDD中, 一个子帧上最多只有一 个 OFDM符号能用于 SRS传输。 在 3GPP LTE TDD中, 在正常子帧上, 最多只有一个 OFDM符号能用于 SRS传输。 在 3GPP LTE TDD中, 在 特殊子帧中的上行导频时隙 (UpPTS 上), 可以有多个 OFDM符号用于 SRS传输。 在本发明中, 所述 CoMP SRS OFDM符号集合 M可以拓展 为一个子帧集合。 该子帧集合可以称为 CoMP SRS子帧集合, 其特征在 于, CoMP UE的 SRS只能在该子帧集合中传输。 在本发明中, 不区分 CoMP SRS符号集合与 CoMP SRS子帧集合。
本发明中, 一个 CoMP UE的协同传输小区中的一个或者多个小区 将该 CoMP UE在所述协同传输小区中的 SRS配置传输给该 CoMP UE。 具体的, 该 CoMP UE的 SRS配置信息可以通过该 CoMP UE的驻留小 区单独传输, 或者通过该 CoMP UE的驻留小区和别的协同传输小区协 同传输, 或者通过每个协同传输小区各自传输。 不排除别的 SRS资源配 置传输方式。
本发明以 OFDM系统为例, OFDM符号作为配置 SRS信号的时频 资源。 但是本发明可以运用在非 OFDM系统中, 用于配置 SRS信号的 时频资源则为传输时隙 ( transmission interval )。
本发明以基于码分复用 CDM的 SRS为例。 但是本发明可以运用在 别的 SRS传输方式,包括但不局限于基于 FDM的 SRS,基于 FDM/CDM 的 SRS, 等等。
本发明以时域 (time domain)为例, 考虑 CoMP SRS OFDM符号, 其 特征为 CoMP UE的 SRS只能在这些 CoMP SRS OFDM符号中发送。本 发明可以筒单的拓展到频域 (frequency domain) , 在频域上预留一些 CoMP SRS OFDM资源元素( Resource Elements ),其特征为 CoMP UE 的 SRS只能在这些 CoMP SRS OFDM资源元素上发送。一个资源元素指的 是一定的频谱资源。 在 3GPP LTE 中, 一个资源元素的频率范围是 15KHz。 CoMP SRS OFDM资源元素可以均匀分部在系统带宽上。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡 在本发明的精神和原则之内所作的任何修改、 等同替换和改进等, 均应 包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种用于多点协同传输的上行参考信号 SRS的配置方法, 其特 征在于, 包括如下步骤:
一个小区集合 A中的一个子集 B中的小区互通信息或者按照约定, 为一个多点协同传输用户设备 CoMP UE在小区集合 B 中的小区配置 SRS资源; 所述在小区集合 B中配置的 CoMP UE的 SRS资源与小区集 合 A中已配置的其它用户设备 UE的 SRS资源正交;
小区集合 B 中的至少一个小区将 SRS 资源配置信息发送给所述 CoMP UE, 所述 SRS资源配置信息用于描述所述在小区集合 B中配置 的 CoMP UE的 SRS资源。
2、 如权利要求 1所述的方法, 其特征在于:
所述 SRS资源配置信息包括 SRS的频域资源、 SRS的序列根序号、 SRS序列的循环移位和 /或 SRS的时域资源。
3、 如权利要求 1所述的方法, 其特征在于:
不同用户设备 SRS资源之间的正交通过时分复用、 频分复用、 码分 复用或者其组合的方式得到。
4、 如权利要求 1所述的方法, 其特征在于:
小区集合 B中的每个小区为所述 CoMP UE配置的 SRS资源是相同 的。
5、 如权利要求 1所述的方法, 其特征在于:
小区集合 B中的不同小区为所述 CoMP UE配置的 SRS资源是不同 的。
6、 如权利要求 5所述的方法, 其特征在于:
小区集合 B中的小区为所述 CoMP UE配置的 SRS资源是正交的。
7、 如权利要求 1所述的方法, 其特征在于:
小区集合 B包括所述 CoMP UE的驻留小区。
8、 如权利要求 1所述的方法, 其特征在于, 该方法进一步包括: 小区集合 A中的小区互通信息或者按照约定,确定一个子帧集合 M; 小区集合 A中的 CoMP UE的 SRS只能在该子帧集合 M中的子帧上传 输。
9、 如权利要求 8所述的方法, 其特征在于, 该方法进一步包括: 小区集合 B中的至少一个小区将子帧集合 M的信息通过广播信道 或者高层信令发送给该 CoMP UE。
10、 如权利要求 8所述的方法, 其特征在于:
小区集合 B中的小区给该 CoMP UE配置的 SRS资源是相同的。
11、 一种用于多点协同传输的上行参考信号 SRS的配置方法, 其特 征在于, 包括如下步骤:
多点协同传输用户设备 CoMP UE从一个小区集合 A中的一个子集 B中的至少一个小区接收该 CoMP UE在小区集合 B中的 SRS资源配置 信息; 所述 SRS资源配置信息中描述的 SRS资源与小区集合 A中其它 已配置的用户设备 UE的 SRS资源正交;
所述 CoMP UE根据所收到的 SRS资源配置信息发送 SRS。
12、 如权利要求 11所述的方法, 其特征在于:
SRS资源包括 SRS的频域资源、 SRS的序列根序号、 SRS序列的循 环移位和 /或 SRS的时域资源。
13、 如权利要求 11所述的方法, 其特征在于:
不同用户设备 SRS资源之间的正交通过时分复用、 频分复用、 码分 复用或者其组合的方式得到。
14、 如权利要求 11所述的方法, 其特征在于: 小区集合 B中的每个小区为所述 CoMP UE配置的 SRS资源是相同 的。
15、 如权利要求 11所述的方法, 其特征在于:
小区集合 B中的不同小区为所述 CoMP UE配置的 SRS资源是不同 的。
16、 如权利要求 15所述的方法, 其特征在于:
小区集合 B中的小区为所述 CoMP UE配置的 SRS资源是正交的。
17、 如权利要求 11所述的方法, 其特征在于:
所述 CoMP UE的驻留小区属于小区集合 B。
18、 如权利要求 11所述的方法, 其特征在于, 该方法进一步包括: 所述 CoMP UE从小区集合 B中的至少一个小区通过广播信道或者 高层信令接收有关一个子帧集合 M的信息; 该子帧集合 M由小区集合 A中的小区互通信息或者按照约定得到;
所述 CoMP UE根据所收到的 SRS资源配置信息发送 SRS的步骤包 括:
CoMP UE将 SRS配置在子帧集合 M中的子帧上。
19、 如权利要求 18所述的方法, 其特征在于:
小区集合 B中的小区给该 CoMP UE配置的 SRS资源是相同的。
20、 如权利要求 18所述的方法, 其特征在于:
该 CoMP UE的驻留小区属于小区集合 B。
21、 一种基站设备, 其特征在于, 所述基站设备属于一个小区集合 A的一个子集 B, 该基站包括:
配置单元一, 用于与小区集合 B中的小区互通信息或者按照约定, 为一个 CoMP UE在小区集合 B中的小区配置 SRS资源; 所述在小区集 合 B中配置的 CoMP UE的 SRS资源与小区集合 A中已配置的其它用户 设备 UE的 SRS资源正交;
配置单元二, 用于向该 CoMP UE发送 SRS资源配置信息, 所述 SRS 资源配置信息用于描述所述配置单元一在小区集合 B 中配置的 CoMP UE的 SRS资源。
22、 如权利要求 21所述的基站设备, 其特征在于:
所述 SRS资源配置信息包括 SRS的频域资源、 SRS的序列根序号、 SRS序列的循环移位和 /或 SRS的时域资源。
23、 如权利要求 21所述的基站设备, 其特征在于:
不同用户设备 SRS资源之间的正交通过时分复用、 频分复用、 码分 复用或者其组合的方式得到。
24、 如权利要求 21所述的基站设备, 其特征在于:
小区集合 B中的每个小区为所述 CoMP UE配置的 SRS资源是相同 的。
25、 如权利要求 21所述的基站设备, 其特征在于:
小区集合 B中的不同小区为所述 CoMP UE配置的 SRS资源是不同 的。
26、 如权利要求 25所述的基站设备, 其特征在于:
小区集合 B中的小区为所述 CoMP UE配置的 SRS资源是正交的。
27、 如权利要求 21所述的基站设备, 其特征在于:
小区集合 B包括所述 CoMP UE的驻留小区。
28、 如权利要求 21所述的基站设备, 其特征在于, 该基站进一步包 括:
配置单元三, 用于与小区集合 A中的小区互通信息或者按照约定, 确定一个子帧集合 M; 其特征在于, 小区集合 A中的 CoMP UE的 SRS 只能在该子帧集合 M中的子帧上传输。
29、如权利要求 28所述的基站设备, 其特征在于, 该基站进一步包 括:
配置单元四, 用于向该 CoMP UE通过广播信道或者高层信令传输 子帧集合 M的信息。
30、 如权利要求 28所述的基站设备, 其特征在于:
小区集合 B中的小区给该 CoMP UE配置的 SRS资源是相同的。
31、 一种多点协同传输用户设备 CoMP UE, 其特征在于, 包括: 接收单元一,用于从一个小区集合 A中的一个子集 B中的至少一个 小区接收该 CoMP UE在小区集合 B中的 SRS资源配置信息; 所述 SRS 资源配置信息中描述的 SRS资源与小区集合 A中其它已配置的用户设 备 UE的 SRS资源正交;
发送单元, 根据所收到的 SRS资源配置信息发送 SRS。
32、 如权利要求 31所述的 CoMP UE, 其特征在于:
SRS资源包括 SRS的频域资源、 SRS的序列根序号、 SRS序列的循 环移位和 /或 SRS的时域资源。
33、 如权利要求 31所述的 CoMP UE, 其特征在于:
不同用户设备 SRS资源之间的正交通过时分复用、 频分复用、 码分 复用或者其组合的方式得到。
34、 如权利要求 31所述的 CoMP UE, 其特征在于:
小区集合 B中的每个小区为所述 CoMP UE配置的 SRS资源是相同 的。
35、 如权利要求 31所述的 CoMP UE, 其特征在于:
小区集合 B中的不同小区为所述 CoMP UE配置的 SRS资源是不同 的。
36、 如权利要求 35所述的 CoMP UE, 其特征在于: 小区集合 B中的小区为所述 CoMP UE配置的 SRS资源是正交的。
37、 如权利要求 31所述的 CoMP UE, 其特征在于:
所述 CoMP UE的驻留小区属于小区集合 B。
38、 如权利要求 31所述的 CoMP UE, 其特征在于, 该 CoMP UE 进一步包括:
接收单元二, 用于从小区集合 B中的至少一个小区通过广播信道或 者高层信令接收有关一个子帧集合 M的信息; 该子帧集合 M由小区集 合 A中的小区互通信息或者按照约定得到;
所述发送单元进一步用于, 将 SRS配置在所述子帧集合 M中的子 帧上。
39、 如权利要求 38所述的 CoMP UE, 其特征在于:
小区集合 B中的小区给该 CoMP UE配置的 SRS资源是相同的。
40、 如权利要求 38所述的 CoMP UE, 其特征在于:
该 CoMP UE的驻留小区属于小区集合 B。
PCT/CN2010/071918 2009-04-20 2010-04-20 一种用于多点协同传输的上行参考信号的配置方法和装置 Ceased WO2010121538A1 (zh)

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US20120051265A1 (en) 2012-03-01
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