WO2011147267A1 - 一种长期演进下行系统的小区间干扰协调方法及装置 - Google Patents

一种长期演进下行系统的小区间干扰协调方法及装置 Download PDF

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Publication number
WO2011147267A1
WO2011147267A1 PCT/CN2011/074115 CN2011074115W WO2011147267A1 WO 2011147267 A1 WO2011147267 A1 WO 2011147267A1 CN 2011074115 W CN2011074115 W CN 2011074115W WO 2011147267 A1 WO2011147267 A1 WO 2011147267A1
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Prior art keywords
cell
interference
update information
icic
sender
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PCT/CN2011/074115
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English (en)
French (fr)
Inventor
李天一
于泳
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刘建
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Publication of WO2011147267A1 publication Critical patent/WO2011147267A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • Inter-cell interference coordination method and device for long-term evolution downlink system Inter-cell interference coordination method and device for long-term evolution downlink system
  • the present invention belongs to the field of communication technologies, and relates to an ICIC (Inter Cell Interference Coordination) method and apparatus for an LTE (Long Term Evolution) downlink system. Background technique
  • ICIC technology is an important method for reducing CEU (Cell-Edge User) co-channel interference, including SFR (Soft Frequency Reuse) or FFR (Fractal Frequency Reuse). It is regarded as an important technology for realizing ICIC in OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system, improving cell CEU throughput and system throughput. As shown in Fig. 1, a method for band division of ICIC can be realized. The edges of three cells use different frequencies, which reduces the co-channel interference of CEU.
  • the existing ICIC scheme solves the problem of co-channel interference between downlink cells to a certain extent, when the existing ICIC scheme is used to deal with downlink inter-cell interference, it has a greater impact on neighboring other cells. For the entire LTE downlink system, the existing ICIC scheme has a poor suppression effect on interference. Summary of the invention
  • the embodiment of the present invention provides a small-interval interference coordination method and apparatus for the long-term evolution downlink system.
  • a method for coordinating inter-cell interference in a long-term evolution downlink system including: The message type signaling sent by the neighboring cell is used to indicate that the base station configuration is updated in the inter-cell interference coordination ICIC mode; and the update information is received in the ICIC mode, where the update information is used to indicate whether the sender cell is interference.
  • the sender cell determines whether it is a cell with interference according to the measurement report of the user in the cell; and determines, according to the update information, a cell that is adjacent to the cell and has interference, and if the cell is a cell with interference, The cell and the neighboring cell with interference are paired to obtain an interference pairing cell, and ICIC processing is performed based on the interference pairing cell.
  • the receiving the update information in the ICIC mode is specifically: the sender cell that has the interference determined according to the previously reported measurement report, and if it is determined that the interference does not exist according to the measurement report reported this time, the neighboring cell is sent to the neighboring cell.
  • the update information is to indicate that the sender cell no longer has interference, and receives update information in the ICIC mode, where the update information is used to indicate that the sender cell no longer has interference.
  • the receiving the update information in the ICIC mode is specifically: the sender cell that does not have interference determined according to the previously reported measurement report, and if it is determined that the interference exists according to the measurement report reported this time, the information is sent to the neighboring cell.
  • the update information is to indicate that the sender cell adds interference
  • the ICIC mode receives update information, and the update information is used to indicate that the sender cell adds interference.
  • the receiving, by the X2 port, the message type signaling sent by the neighboring cell specifically: receiving, by using the X2 port, message type signaling sent by the neighboring cell, where the cell sending the message type signaling is a cell with interference;
  • the information determines the neighboring cell that has interference, and specifically: directly determines the neighboring cell with interference according to the update information sent by the cell with the interference.
  • the receiving the update information in the ICIC mode is specifically: receiving the update information in the ICIC mode, where the update information carries the physical cell identifier PCI.
  • the receiving update information is specifically: receiving update information, where the update information includes frequency allocation information of a sender cell; the pairing the local cell and the neighboring cell with interference to obtain an interference pairing cell, and performing ICIC based on the interference pairing cell
  • the processing is specifically: pairing the current cell with the neighboring cell with interference to obtain an interference pairing cell group, performing ICIC processing based on the interference pairing cell group, and the frequency division manner of the cells in each cell group is the same.
  • the ICIC processing is performed by the interference-based pairing cell group, specifically: the time-sharing manner is adopted to improve the transmission power of each cell base station in the interference paired cell group to the edge user CEU, and only one cell base station is improved at the same time.
  • the transmit power of the CEU is synchronized and reduced in a time-sharing manner to reduce the transmit power of the base station CCU of each cell in the interfering cell group, and reduce the transmit power of one CeNB to its CCU at the same time.
  • the cell with increased CEU transmit power and the cell with reduced transmit power to the CCU are neighbor cells.
  • An inter-cell interference coordination device for a long-term evolution downlink system includes:
  • a signaling receiving module configured to receive, by using an X2 port, message type signaling sent by a neighboring cell, to indicate that the base station configuration is updated in an ICIC mode
  • an information receiving module configured to receive, in an ICIC mode, the update information, where the update information is used to indicate whether the sender cell is a cell with interference, and the sender cell determines, according to the measurement report of the user in the cell, whether it is a cell with interference;
  • a processing module configured to determine, according to the update information, a cell that is adjacent to the local cell and has interference, if the cell is a cell with interference, pair the local cell and the neighboring cell with interference to obtain an interference pairing cell,
  • the interference pairing cell performs ICIC processing.
  • the information receiving module is further configured to: according to the measurement report reported in the previous report, the sender cell that has the interference, if it is determined that the interference is no longer existed according to the measurement report reported in the current report, the update information sent to the neighboring cell In order to indicate that the sender cell no longer has interference, the update information is received in the ICIC mode, where the update information is used to indicate that the sender cell no longer has interference.
  • the information receiving module is further configured to: according to the measurement report reported in the previous report, the sender cell that does not have interference, if the interference is determined according to the measurement report reported in this time, the update information sent to the neighboring cell is Instructing the sender cell to add interference, and receiving update information in the ICIC mode, where the update information is used to indicate that the sender cell adds interference.
  • the signaling receiving module is further configured to: receive, by using an X2 port, message type signaling sent by a neighboring cell, where the cell that sends the message type signaling is a cell with interference; the processing module is further configured to: Update information sent by the interfering cell, directly determine the adjacent and interference Community.
  • the information receiving module is further configured to: receive update information in an ICIC mode, where the update information carries a PCI.
  • the information receiving module is further configured to: receive update information, where the update information includes frequency allocation information of a sender cell, and the processing module is further configured to: pair the current cell with the neighboring cell with interference to obtain interference pairing
  • the cell group performs ICIC processing based on the interference paired cell group, and the frequency division manner of the cells in each cell group is the same.
  • FIG. 1 is a schematic diagram of band division capable of realizing ICIC in the prior art
  • FIG. 3 is a schematic diagram of a process for establishing an interfering cell pairing list according to a first embodiment of the present invention
  • FIG. 4A is a schematic diagram of ICIC processing according to a first embodiment of the present invention
  • FIG. 4B is a schematic diagram of a user power adjustment state according to a first embodiment of the present invention
  • FIG. 4C is a schematic diagram of a user power adjustment end state according to a first embodiment of the present invention
  • FIG. 5 is a structural diagram of a second implementation apparatus provided by the present invention. detailed description
  • An embodiment of the present invention provides a method for coordinating inter-cell interference in a long-term evolution downlink system, which is to solve the problem that the existing ICIC solution has a poor effect on the interference suppression of the entire LTE downlink system.
  • the method provided is that after the frequency division of the cell according to the frequency allocation policy, all users are measured, and the measurement report is uploaded to the base station.
  • the measurement report contains: the serving cell ID, the pilot signal strength and/or the signal quality.
  • the measurement report for example, according to the signal strength measurement information, the base station-to-user road loss difference is obtained, according to the path loss difference
  • the intra-cell users are divided into CCU (Cell-Center User) and CEU (Cell-Edge User). , edge users ;).
  • CCU Cell-Center User
  • CEU Cell-Edge User
  • edge users edge users ;
  • the path loss difference method is used as an example.
  • the serving cell sets a decision threshold, and is used to determine whether the serving cell has interference through the measurement report, that is, the "problem user" in the CEU is found out, and the specific method is: According to the existing pilot coverage area, RSRP (Reference Signal Receiving) Power, reference signal receiving power) receiving strength is lower than a certain pilot strength threshold (set threshold), the threshold value can be determined according to the cell user coverage; or the existing pilot service quality is lower than the quality
  • RSRP Reference Signal Receiving
  • set threshold a certain pilot strength threshold
  • the threshold value can be determined according to the cell user coverage; or the existing pilot service quality is lower than the quality
  • the pilot quality threshold, the threshold value can be determined according to the cell user service quality, and based on the above process, it can be determined whether the cell has interference.
  • the cells adjacent to each other send a message type (Message Type) signaling through the X2 port.
  • Message Type message type
  • the cell A of the base station 1 has a "problem user”.
  • the cell A passes through the X2 port to the cell where the base station 2 is located.
  • B sends the Message Type signaling, and the base station 2 sends the response signaling to the base station 1 after receiving the Message Type signaling.
  • the base station 1 sends the PCI (Physical Cell Identity) of the cell A to
  • the neighboring cell such as the cell where the base station 2 is located
  • sends indicating that the cell A has a "problem user", or indicates that the original "problem user” of the cell A does not exist, or indicates that the cell A adds a "problem user.”
  • the cell B where the base station 2 is located determines the PCI of the cell adjacent to the local cell and has interference.
  • the cell C where the base station 3 is located has a "problem user" and is adjacent to the cell B, and performs operations similar to the cell A.
  • Cell A and cell B which are interfering and adjacent to each other, are paired to obtain an interference pairing cell "small area A-cell B", and ICIC processing is performed based on the interference pairing cell "cell A-cell B".
  • each cell can establish a neighboring cell interference list.
  • the cell list contains the neighboring cell PCI with interference, and the neighboring cell PCI in the list is based on the neighboring cell each time.
  • the results of the measurement report are updated.
  • the CEU of the cell A uses the frequency point fl
  • the neighboring area interference list of the cell A includes the PCI of the cell B and the cell C, in the case of the cell A, the cell B, and the cell C.
  • the neighboring cell of the cell A uses at least one frequency band, for example, the CEU of the cell A uses the frequency f2, and the cell B and the cell C use up to two frequency bands, for example, the CEUs of the cell B and the cell C respectively use the frequencies f2 and ⁇ .
  • the cell 1, the cell ⁇ , the cell C are neighboring cells
  • the cell D is the neighboring cell of the cell A.
  • the base station 1 is the base station of the cell A
  • the base station 2 is the cell B.
  • the base station, the base station 3 is the base station of the cell C
  • the base station 4 is the base station of the cell D
  • the base station 5 is the base station of the cell E.
  • the PCI of the cell A is 1, the PCI of the cell B is 2, the PCI of the cell C is 3, and the cell D
  • the PCI is 4, and the PCI of the cell E is 5.
  • the method for performing the method in this embodiment is as shown in FIG. 2, and includes:
  • Step 10 Each cell performs measurement on its user and receives a measurement report reported by its user.
  • the base station of cell A measures the user according to a predetermined measurement interval.
  • the user periodically reports the measurement report.
  • the reported measurement report includes: the pilot signal strength and/or signal quality received by the terminal, the serving cell ID, and the serial number of the current measurement.
  • the measurement report of the user in the cell may be periodically reported, and the cell with interference is determined according to the measurement report reported each time. For example, when the first measurement report is reported, it is determined that the cell A is a cell with interference, and the cell B is a cell with no interference. When the second measurement report is reported in the next cycle, it is determined that the cell 8 and the cell B are both interfered. Community.
  • Step 20 Determine, according to the measurement report, whether each cell has interference.
  • the path loss difference method is used as a preferred solution to obtain the measured path loss difference of the user, and the user is divided into CCU and CEU by comparing with the preset path loss difference threshold.
  • the serving cell sets the decision threshold and finds the "user in question" in the CEU.
  • Step 30 The cell type base stations adjacent to each other send the Message Type signaling through the X2 port, and are used to indicate that the receiver is ready to update the base station configuration in the ICIC mode.
  • the base station 1 of the cell A sends the Message Type signaling to the base station 2 of the cell B through the X2 port, where the original Procedure Code 15 can be extended to "the eNB Configuration Update" in the ICIC mode. It is valid in ICIC mode and is used to instruct the receiver to prepare to update the base station configuration in ICIC mode and perform an eNB Configuration Update-like operation.
  • Information type signaling refers to Table 1.
  • Step 40 After receiving the Message Type signaling, the receiving cell base station replies with ACKNOWLEDGE/eNB Configuration Update (FAILURE), that is, the response succeeds/response fails, and if it fails, it waits for the next reconfiguration.
  • FAILURE ACKNOWLEDGE/eNB Configuration Update
  • Step 50 The d and the base stations adjacent to each other send update information through the X2 port.
  • the update information includes EARFCN (E-UTRA Absolute Radio Frequency Channel Number), PCI (Physical Cell Identifier of the neighbour cell, 4p area physical cell identifier), and ECGI (E-UTRAN Cell Global Identifier of the neighbour). Cell, global cell identifier).
  • the frequency information EARFCN indicates the CEU use frequency of the cell where the base station transmitting the Message Type signaling is located. For example, the base station 1 in the cell A sends the Message Type signaling, and the CEU of the cell A uses the frequency point fl, and the EARFCN is fl.
  • PCI indicates that the Message Type signaling sends the PCI of the cell. For example, the base station 1 in the cell A transmits the Message Type signaling, and the PCI of the cell A is 1.
  • ECGI indicates that the Message Type signaling sends the global cell identity of the cell.
  • the base station of each cell sends the update information through the X2 port.
  • the update information must include the PCI of the sender cell.
  • the specific format can be as follows, but it is used to indicate whether the sender cell is a cell with interference.
  • the specific form may be as follows.
  • the reporting unit of the cell is reported in the cell, and the sender cell with the interference, such as the cell D with the PCI 4, determined according to the previously reported measurement report, is determined according to the measurement report reported this time. If there is interference, then cell D goes to cell A (cell
  • the neighboring cell of D transmits update information, and the update information includes information in Table 3, which is used to indicate that cell D no longer has interference.
  • the EARFCN bound to the cell D may be added to the update information, for example, by adding the EARFCN of Cell D to the neighbor information of the neighbor information Neighbour Information.
  • the specific form may be as follows: According to the measurement report period of the user in the cell, the sender cell that does not have interference determined according to the measurement report reported in the previous time, such as the cell C with the PCI 3, is determined according to the measurement report reported this time.
  • the interference is transmitted by the cell C to the cell A (the neighboring cell of the cell C).
  • the update information includes the information in the table 4, and is used to indicate that the cell C adds interference.
  • the EARFCN bound to the cell C may also be added to the update information.
  • the specific form may be as follows: Only the cell with interference (such as cell A, cell B, cell C, and cell E) sends Message Type signaling to its neighboring cell through X2 port, and then the cell with interference to cell A, such as cell B.
  • the cell C and the cell E send update information, and the update information includes information in Table 5B, Table 5C, and Table 5E, respectively, indicating that the cell C and the cell E currently have interference.
  • the cell D is a cell that does not have interference, it is not necessary to send Message Type signaling to the neighboring cell, and further, the neighboring cell does not receive the update information of the cell D.
  • Step 60 The receiving cell receives the update information through the X2 port to obtain a neighbor interference list.
  • the receiving cell is cell A
  • cell A obtains a neighbor interference list according to the update information
  • the cell in the neighbor interference list and the local cell constitute an interference matching cell. It is assumed that the cell C where the base station 3 is located is a new cell, and the cell D where the base station 4 is located is a deleted cell, according to the latest measurement.
  • the PCI is only a preferred solution of the present embodiment.
  • the PCI of the adjacent and interfering cell can be stored in the specified storage space. That is, the PCIs stored in the specified space are adjacent and exist. PCI of the interfering cell.
  • PCI 3 Cell A 3 (PCI 3) 4 (PCI 4)
  • the table 6B is obtained from the table 6A, and the PCI of the sender cell in which the interference is determined according to the measurement report reported in the previous report can be realized, and the PCI of the sender cell that is no longer interfered by the measurement report reported in this report can be determined.
  • a PCL of a cell that is adjacent to the receiver cell and that currently has interference and a PCI of the sender cell that has interference according to the previously reported measurement report, and a newly added interference sender cell determined by the report report reported this time PCI, determining the PCI of a cell adjacent to the receiving cell and currently having interference.
  • the cell A may also obtain the table 6C according to the information in Table 5B, Table 5C, and Table 5E reported by the cell B, the cell C, and the cell E. Update group user group number list
  • PCI 3 Cell A 3
  • the cell A can directly determine the PCI of the cell adjacent to the cell A and has interference according to the update information sent by the cell with interference (such as cell B, cell C, and cell E).
  • the neighboring cell interference list is obtained as a preferred embodiment, and the PCI of the cell adjacent to the receiving cell and having interference is implemented by using the neighboring cell interference list, and the configuration of the receiving cell base station is updated.
  • the base station 2 of the cell B performs the same operation on the base station 1 of the cell A, and also receives the update information of the neighboring cell C and the cell D.
  • the neighboring cell interference list of the cell B is as follows:
  • Step 70 Establish an interfering cell pairing list according to the neighbor interference list.
  • the cell A compares the EARFCN information of the cell B, the cell C, and the cell E, and classifies the cells in the neighbor cell interference list into the interference pair cell group. All the cells in the same cell group use the same frequency, and the cell pairing list is established as shown in Table 8.
  • the cell group B and the cell E are the same cell group, and the cell group B and the cell E have the same frequency allocation, and the cell C is another cell group called the set A2.
  • the method of using the interfering cell pairing list to indicate the interference pairing cell group is only a preferred solution of the present implementation.
  • the PCI of the cell A may be used as an index, and the neighboring and interfering cell is stored in the corresponding storage space. PCI, in order to represent the interference paired cell group.
  • the cell B is similarly set up to establish a cell pairing list as shown in Table 9. Other cells are not described again.
  • the entire process of establishing a cell pairing list is referred to FIG.
  • Step 80 Perform ICIC processing based on the interfering cell pairing list.
  • the interference pairing cell can be determined by using the foregoing interfering cell pairing list, and then the ICIC processing is performed based on the principle that the transmission power of the CEU of each cell base station in the interference pairing cell is improved in a time-sharing manner, and at the same time.
  • the transmit power of only one cell base station to its CEU is increased, and the transmit power of each CeNB in the interfering cell is reduced by the time-sharing manner, and only one cell base station transmits the CCU to the CCU at the same time.
  • the power, the cell that improves the transmission power of the CEU, and the cell that reduces the transmission power of the CCU are neighboring cells.
  • the following examples can be used to change the understanding of how the invention performs ICIC processing.
  • the LTE downlink interference system, the macro base station, the 10 MHz bandwidth, and the 16QAM modulation mode assume that the initial transmit power of the base station to the user in the cell is A (dBm), assuming that the power adjustment step size is UeOffset (dBm) (the amplitude adjustment range is based on The interference of the measurement report reported by the user cycle can be configured.
  • the transmit power of the CEU is A+UeOffset (dBm)
  • the transmit power of the CCU is A-UeOffset (dBm).
  • the power adjustment step UeOffset is a PDSCH (Physical Downlink Shared CHannel) user-level parameter.
  • UeOffset For the value of UeOffset, see the description of the value of P_A in Protocol 331, which ranges from ⁇ 3, 2, 1, 0. -1.77, -3, -4.77, -6dB ⁇ , default is 3dB; the transmit power of the edge UE is equal to the maximum average transmit power.
  • TS 36.213 Release 9
  • support for CEU and CCU uplink and downlink power ratios that is, P_B and antenna number settings based on high layer signaling.
  • FIG. 4A The method of ICIC processing is shown in Figure 4A, including:
  • Step 801 Increase the transmit power of the cell A base station to its CEU, and reduce the transmit power of all the cell base stations of the set A1 to the respective CCUs, and at the same time, the cell base station in the set A2 maintains the initial value of the transmit power of the respective users, and proceeds to step 802.
  • Step 802 The cell A base station restores its CEU transmit power to an initial value, improves the transmit power of the base stations of all cells of the set A1 to the respective CEUs, and reduces the transmit power of all the base stations of the set A2 to the respective CCUs. And proceeds to step 803.
  • Step 803 Reduce the transmit power of the cell A base station to its CCU, restore the transmit power of all the base stations of all the cell base stations of the set A1 to the initial value, and improve the transmit power of each cell base station of the set A2 to the respective CEU. And proceeds to step 801.
  • the set A1 includes the cell B, and the set A2 includes the cell C.
  • Step 801, step 802, and step 803 can be repeatedly performed periodically. For example, time1 is performed at step 801, time2 is performed at step 802, and time3 is performed at step 803 at time4. Time with Timel Step 801 is performed as well. It is also possible that the execution period is different, and the embodiment of the present invention is repeatedly executed in a cycle.
  • a schematic diagram of the user power adjustment state is shown in FIG. 4B.
  • the neighboring cell interference list of cell A does not change.
  • the ID of the neighboring area is deleted from the neighboring area interference list of the cell A. If the deleted cell is the last cell of a certain subset, after deleting the cell ID (assuming that Cell C is deleted in Table 10 below):
  • the cell pairing list of the base station 1 of the cell A is as shown in Table 11:
  • Step 901 Maintain the initial value of the transmit power of the C-cell of the cell A at the same time, and increase the transmit power of the cell A to the CEU of the cell A; and reduce the transmit power of the CCU of the cell set A1 to the CCU, and maintain the transmit power of the CEU user in the A1. value. And proceeds to step 902.
  • Step 902 Reduce the transmit power of the cell A of the cell A to the CCU, and maintain the initial value of the CEU transmit power of the cell 1; maintain the initial value of the CCU transmit power of the cell set A1; and increase the transmit power of the cell set A1 base station to its CEU. Going to step 901 again.
  • the process proceeds to step 801 to step 803. If there is no neighboring cell in the neighboring cell, the base station in the cell A maintains the CEU high transmit power mode, and the CCU transmit power does not change until the next measurement result is reported, and the pairing list is updated.
  • the process After updating the list, if a cell with two bands divided in the cell pairing list appears, the process jumps to steps 801-803. If there is no neighboring cell in the neighboring cell, the base station in the cell A maintains its CEU high transmit power mode, and the CCU transmit power does not change until the cell A has no problem in the last measurement. The method ends, and the cell configuration is restored. value.
  • Cell A, Cell B and Cell C use different frequency band division methods.
  • the problem C does not exist in the cell C (the user services end offline, or move out of the location), and the cell C in the cell interference list is deleted.
  • the time K+1 is started until the next measurement update, and the scenario step 901-step 902 of the two-cell scenario is performed.
  • cell B is deleted in the interference list.
  • cell A increases the edge transmit power step by step until it withdraws at a certain time.
  • the neighborhood neighbor list and interference pairing list of the cell are cleared.
  • the inter-cell X2 interface interaction delay is smaller than the user periodically reporting the measurement delay, that is, the use and termination time of the embodiment of the present invention is not less than this value, and the base station should not be too frequent.
  • the measurement report period is 120ms or 240ms, and the initial time polling period of the cell is greater than the measurement report period.
  • the subsequent time polling period can be Below the measurement reporting period.
  • the neighboring cells with coverage and quality problems are paired, and the time division method is used for power allocation, and the interference is reduced by fair time granularity lifting power.
  • Improve CEU throughput improves the performance of the neighboring cells with coverage and quality problems.
  • the embodiment of the present invention provides a second embodiment, which is an inter-cell interference coordination device of a long-term evolution downlink system. As shown in FIG. 5, the method includes:
  • the signaling receiving module 1001 is configured to receive, by using the X2 port, a message type signal sent by the neighboring cell, to indicate that the base station configuration is updated in the ICIC mode;
  • the information receiving module 1002 is configured to receive, in the ICIC mode, update information, where the update information is used to indicate whether the sender cell is a cell in which interference exists, and the sender cell determines, according to the measurement report of the user in the cell, whether the cell is in the presence of interference;
  • the processing module 1003 is configured to determine, according to the update information, a cell that is adjacent to the local cell and has interference, and if the current cell is a cell with interference, pair the local cell and the neighboring cell with interference to obtain an interference pairing cell, based on The interference pairing cell performs ICIC processing.
  • the information receiving module 1002 is further configured to: according to the measurement report reported in the previous report, the sender cell that has the interference, if it is determined that the interference is no longer existed according to the measurement report reported in the current report, the update information sent to the neighboring cell To indicate that the sender cell no longer has interference, the update information is received in the ICIC mode, and the update information is used to indicate that the sender cell no longer has interference.
  • the information receiving module 1002 is further configured to: according to the measurement report reported in the previous report, the sender cell that does not have interference, if the interference is determined according to the measurement report reported in this time, the update information sent to the neighboring cell is Instructing the sender cell to add interference, in ICIC mode The update information is received, and the update information is used to indicate that the sender cell adds interference.
  • the signaling receiving module 1001 is further configured to receive, by using the X2 port, message type signaling sent by the neighboring cell, where the cell that sends the message type signaling is a cell with interference;
  • the processing module 1003 is further configured to directly determine a neighboring cell that has interference according to the update information sent by the cell in which the interference exists.
  • the information receiving module 1002 is further configured to receive update information in the ICIC mode, and the update information carries the PCI.
  • the information receiving module 1002 is further configured to receive update information, where the update information includes frequency allocation information of the sender cell.
  • the processing module 1003 is further configured to pair the local cell and the neighboring cell with interference to obtain an interference pairing cell group, and perform ICIC processing based on the interference pairing cell group, and the frequency division manner of the cells in each cell group is the same.
  • the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and modifications of the invention Industrial applicability
  • the main purpose of the embodiments of the present invention is to provide an inter-cell interference coordination method and apparatus for a long-term evolution downlink system, which solves the problem that the existing ICIC scheme in the LTE downlink system has a poor suppression effect on interference.
  • it is because the message type signaling is sent based on the X2 port, the pairing is obtained by the interference pairing cell, and the ICIC processing is performed based on the interference pairing cell, thereby improving the signal coverage and quality problems faced by the CEU, and improving the throughput rate. Try to avoid affecting other cells, so as to improve the suppression effect on interference as a whole.

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Abstract

为了解决现有技术中对于整个LTE下行系统而言，现有的ICIC方案对干扰的抑制效果较差的问题，本发明公开了一种长期演进下行系统的小区间干扰协调方法及装置，其中方法包括，确定小区是否存在干扰，彼此相邻的小区之间通过X2口发送消息类型信令，用于指示对基站配置进行更新，在ICIC模式下接收方小区接收更新信息，根据更新信息，确定与接收方小区相邻且存在干扰的小区，对接收方小区基站配置进行更新，并根据得到的干扰配对小区，进行ICIC处理，正是由于基于X2口发送消息类型信令，配对得到干扰配对小区，并基于干扰配对小区进行ICIC处理，使得从整体上提高对干扰的抑制效果。

Description

一种长期演进下行系统的小区间干扰协调方法及装置 技术领域
本发明属于通信技术领域， 涉及 LTE ( Long Term Evolution,长期演进） 下行系统的 ICIC ( Inter Cell Interference Coordination, 小区间干扰协调）方 法及装置。 背景技术
在目前关于 LTE的干扰控制技术中， ICIC技术被广泛关注。 ICIC技术 是一种用于降低 CEU ( Cell-Edge User, 小区边缘用户） 同频干扰的重要方 法， 其中， SFR ( Soft Frequency Reuse, 软频率复用 )或 FFR ( Fractional Frequency Reuse , 部分频率复用 ) 被看作是实现 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用 )移动通信系统中 ICIC、 提 高小区 CEU吞吐量和系统吞吐量的重要技术。 如图 1所示， 给出了一种能 够实现 ICIC的频带划分方法， 其中的 3个小区的边缘使用不同频率， 这样 就减少了 CEU的同频干扰。 现有的 ICIC方案虽然在一定程度上解决了下 行小区间同频干扰的问题， 但釆用现有的 ICIC方案在对下行小区间干扰进 行处理时， 对邻近的其它小区产生影响较大， 可见对于整个 LTE下行系统 而言， 现有的 ICIC方案对干扰的抑制效果较差。 发明内容
为了解决现有技术中釆用 ICIC方案对于整个 LTE下行系统而言，对干 扰的抑制效果较差的问题， 本发明实施例提供了一种长期演进下行系统的 小区间干扰协调方法及装置。
为解决上述技术问题， 本发明实施例的技术方案是这样实现的： 一种长期演进下行系统的小区间干扰协调方法， 包括： 通过 X2 口接 收相邻小区发送的消息类型信令， 用于指示在小区间干扰协调 ICIC模式下 对基站配置进行更新； 在 ICIC模式下接收更新信息， 所述更新信息用于指 示发送方小区是否为存在干扰的小区， 发送方小区根据小区内用户的测量 报告确定是否为存在干扰的小区； 根据所述更新信息， 确定与本小区相邻 且存在干扰的小区， 若本小区为存在干扰的小区， 将本小区和存在干扰的 相邻小区配对得到干扰配对小区， 基于所述干扰配对小区进行 ICIC处理。
所述在 ICIC模式下接收更新信息， 具体为： 根据前一次上报的测量报 告确定的存在干扰的发送方小区， 若根据本次上报的测量报告确定不再存 在干扰， 则向其相邻小区发送的更新信息为指示该发送方小区不再存在干 扰， 在 ICIC模式下接收更新信息， 所述更新信息用于指示该发送方小区不 再存在干扰。
所述在 ICIC模式下接收更新信息， 具体为： 根据前一次上报的测量报 告确定的不存在干扰的发送方小区， 若根据本次上报的测量报告确定存在 干扰， 则向其相邻小区发送的更新信息为指示该发送方小区新增干扰， 在
ICIC模式下接收更新信息，所述更新信息用于指示该发送方小区新增干扰。
所述通过 X2 口接收相邻小区发送的消息类型信令， 具体为： 通过 X2 口接收相邻小区发送的消息类型信令， 发送消息类型信令的小区为存在干 扰的小区； 所述根据更新信息确定相邻且存在干扰的小区， 具体为： 仅根 据存在干扰的小区发送的更新信息， 直接确定相邻且存在干扰的小区。
所述在 ICIC模式下接收更新信息具体为： 在 ICIC模式下接收更新信 息， 所述更新信息携带物理小区标识 PCI。
所述接收更新信息， 具体为： 接收更新信息， 所述更新信息包含发送 方小区的频率分配信息； 所述将本小区和存在干扰的相邻小区配对得到干 扰配对小区， 基于干扰配对小区进行 ICIC处理， 具体为： 将本小区和存在 干扰的相邻小区配对得到干扰配对小区组， 基于干扰配对小区组进行 ICIC 处理， 各小区组中小区的频率划分方式相同。 所述基于干扰配对小区组进行 ICIC处理， 具体为： 釆用分时的方式分 别提高干扰配对小区组中的各小区基站对其边缘用户 CEU的发射功率， 且 同一时刻仅提高一个小区基站对其 CEU的发射功率； 并同步釆用分时的方 式分别降低干扰配对小区组中的各小区基站对其中心用户 CCU 的发射功 率， 且同一时刻仅降低一个小区基站对其 CCU的发射功率， 同步对 CEU 发射功率提高的小区和对 CCU发射功率降低的小区为相邻小区。
一种长期演进下行系统的小区间干扰协调装置， 包括：
信令接收模块， 用于通过 X2 口接收相邻小区发送的消息类型信令， 用于指示在 ICIC模式下对基站配置进行更新；
信息接收模块， 用于在 ICIC模式下接收更新信息， 所述更新信息用于 指示发送方小区是否为存在干扰的小区， 发送方小区根据小区内用户的测 量报告确定是否为存在干扰的小区；
处理模块， 用于根据所述更新信息， 确定与本小区相邻且存在干扰的 小区， 若本小区为存在干扰的小区， 将本小区和存在干扰的相邻小区配对 得到干扰配对小区， 基于所述干扰配对小区进行 ICIC处理。
所述信息接收模块， 还用于： 根据前一次上报的测量报告确定的存在 干扰的发送方小区， 若根据本次上报的测量报告确定不再存在干扰， 则向 其相邻小区发送的更新信息为指示该发送方小区不再存在干扰， 在 ICIC模 式下接收更新信息， 所述更新信息用于指示该发送方小区不再存在干扰。
所述信息接收模块， 还用于： 根据前一次上报的测量报告确定的不存 在干扰的发送方小区， 若根据本次上报的测量报告确定存在干扰， 则向其 相邻小区发送的更新信息为指示该发送方小区新增干扰， 在 ICIC模式下接 收更新信息， 所述更新信息用于指示该发送方小区新增干扰。
所述信令接收模块， 还用于： 通过 X2 口接收相邻小区发送的消息类 型信令， 发送消息类型信令的小区为存在干扰的小区； 所述处理模块， 还 用于： 仅根据存在干扰的小区发送的更新信息， 直接确定相邻且存在干扰 的小区。
所述信息接收模块， 还用于： 在 ICIC模式下接收更新信息， 所述更新 信息携带 PCI。
所述信息接收模块， 还用于： 接收更新信息， 所述更新信息包含发送 方小区的频率分配信息； 所述处理模块， 还用于： 将本小区和存在干扰的 相邻小区配对得到干扰配对小区组， 基于干扰配对小区组进行 ICIC处理， 各小区组中小区的频率划分方式相同。
由本发明提供的具体实施方案可以看出， 正是由于基于 X2 口发送消 息类型信令，配对得到干扰配对小区，并基于干扰配对小区进行 ICIC处理， 改善 CEU 面临的信号覆盖和质量问题，提高其吞吐率，尽量避免对其它小 区产生影响， 使得从整体上提高对干扰的抑制效果。 附图说明
图 1为现有技术中能够实现 ICIC的频带划分示意图；
图 2为本发明提供的第一实施例方法流程图；
图 3为本发明提供的第一实施例建立干扰小区配对列表过程示意图； 图 4A为本发明提供的第一实施例 ICIC处理示意图；
图 4B 为本发明提供的第一实施例用户功率调整状态示意图； 图 4C 为本发明提供的第一实施例用户功率调整结束状态示意图； 图 5为本发明提供的第二实施装置结构图。 具体实施方式
为了解决现有技术中对于整个 LTE下行系统而言，现有的 ICIC方案对 干扰的抑制效果较差的问题， 本发明实施例提供一种长期演进下行系统的 小区间干扰协调方法， 本实施例的提供的方法， 将小区按照频率分配策略 进行频率划分后， 对所有用户进行测量， 并将测量报告上传基站。 测量报 告中包含： 服务小区 ID、 导频信号强度和 /或信号质量。 根据测量报告 （例如， 按照信号强度测量信息， 得到基站到用户的路 损差值， 根据路损差）将小区内用户分为 CCU ( Cell-Center User, 中心用 户）和 CEU ( Cell-Edge User, 边缘用户；)。 当然划分用户类型方法可以有 其它方法， 此处举例按路损差值方法。
服务小区设定判定门限， 用以再通过测量报告确定服务小区是否存在 干扰， 即将 CEU中存在 "问题的用户" 找出来， 具体方法为： 可以根据现 有导频覆盖区域的 RSRP ( Reference Signal Receiving Power, 参考信号接收 功率）接收强度低于某个导频强度阀值（设定的判定门限）， 阀值的配置可 以根据小区用户覆盖确定； 也可以根据现有导频服务质量强度低于某个导 频质量阀值， 阀值的配置可以根据小区用户服务质量确定， 基于上述的过 程， 可以判别小区是否存在干扰。
彼此相邻的小区之间通过 X2 口发送消息类型 （ Message Type )信令， 例如基站 1所在小区 A存在 "问题的用户"， 在测量结果上报后， 小区 A 通过 X2 口向基站 2所在的小区 B发送 Message Type信令， 基站 2收到 Message Type信令后向基站 1发送应答信令， 若应答信令为应答成功， 基 站 1会将小区 A的 PCI( Physical Cell Identity,物理小区标识）向邻小区（如 基站 2所在的小区）发送， 表明小区 A存在 "问题的用户"， 或者表明小区 A原有 "问题的用户" 已经不存在， 或表明小区 A新增 "问题的用户"。 基 站 2所在的小区 B会根据此确定与本小区相邻且存在干扰的小区的 PCI, 当然基站 3所在小区 C存在 "问题的用户" 且与小区 B相邻， 执行和小区 A类似的操作。
将存在干扰且彼此相邻的小区 A和小区 B ,配对得到干扰配对小区 "小 区 A-小区 B" , 基于干扰配对小区 "小区 A-小区 B" 进行 ICIC处理。
"问题用户 " 所在小区在上报的测量结果会向邻小区发送本小区的 PCI, 同样会收到邻区的 PCI,具体实施时每个小区可以建立邻区干扰列表。 本小区列表中包含存在干扰的邻区 PCI,该列表中的邻区 PCI根据邻区每次 测量报告的结果更新。
以小区 A、 小区 B、 小区 C为存在干扰且彼此相邻为例， 在具体实施 时， 小区 A的 CEU使用频点 fl , 小区 A的邻区干扰列表中包括小区 B和 小区 C的 PCI,其中小区 A的邻小区最少釆用 1个频段例如小区 A的 CEU 都使用频率 f2,小区 B和小区 C最多釆用 2个频段例如小区 B和小区 C的 CEU分别使用频率 f2和 β。
以小区 Α、 小区 Β、 小区 C为彼此相邻小区， 小区 D、 小区 E为小区 A的相邻小区为例， 对本方案进行详细说明， 其中基站 1为小区 A的基站、 基站 2为小区 B的基站、基站 3为小区 C的基站、基站 4为小区 D的基站、 基站 5为小区 E的基站， 小区 A的 PCI为 1、 小区 B的 PCI为 2、 小区 C 的 PCI为 3、 小区 D的 PCI为 4、 小区 E的 PCI为 5 , 本实施例方法执行步 骤如图 2所示， 包括：
步骤 10, 各小区对其用户进行测量并接收其用户上报的测量报告。 以小区 A为例，根据预定的测量间隔，小区 A的基站对用户进行测量。 用户周期性上报测量报告， 上报的测量报告包括： 终端接收到的导频信号 强度和 /或信号质量、 服务小区 ID、 本次测量的序号。
具体实施时， 小区内用户的测量报告可以是周期上报的， 根据每次上 报的测量报告确定存在干扰的小区。 例如， 在第一次测量报告上报时， 确 定小区 A是存在干扰的小区， 小区 B是不存在干扰的小区， 在下一个周期 第二次测量报告上报时， 确定小区八、 小区 B均是存在干扰的小区。
步骤 20, 根据测量报告确定各小区是否存在干扰。
本实施例以路损差值方法作为优选方案， 得到用户的实测路损差值， 和预设路损差门限比较，将用户分为 CCU和 CEU。服务小区设定判定门限， 将 CEU中存在 "问题的用户" 找出来。
步骤 30 ,彼此相邻的小区基站之间通过 X2 口发送 Message Type信令， 用于指示接收方在 ICIC模式下准备对基站配置进行更新。 例如，小区 A的基站 1通过 X2口向小区 B的基站 2发送 Message Type 信令， 这里可以扩展原有 Procedure Code 15为 "ICIC模式下的基站更新过 程（ eNB Configuration Update )" , 此信令仅在 ICIC模式下有效， 用于指示 接收方在 ICIC 模式下准备对基站配置进行更新， 并执行类似 eNB Configuration Update操作。 信息类型信令参照表 1。
Figure imgf000009_0001
表 1
基站更新过程 ( Message Type )参照表 2。
Figure imgf000009_0002
表 2
步骤 40,接收方小区基站收到 Message Type信令后回复应答信令（ eNB Configuration Update ACKNOWLEDGE/eNB Configuration Update FAILURE ), 即应答成功 /应答失败， 若失败等待下次重新配置。
步骤 50 , 彼此相邻的 d、区基站之间通过 X2 口发送更新信息。
更新信息包含了 EARFCN ( E-UTRA Absolute Radio Frequency Channel Number, 小区频点 ), PCI ( Physical Cell Identifier of the neighbour cell, 4p 区物理小区标识）和 ECGI ( E-UTRAN Cell Global Identifier of the neighbour cell, 全局小区标识）。 频率信息 EARFCN表示发送 Message Type信令的基 站所在小区的 CEU使用频点， 例如， 小区 A中的基站 1发送 Message Type 信令，小区 A的 CEU使用频点 fl ,则 EARFCN为 fl。 PCI表示 Message Type 信令发送小区的 PCI, 例如， 小区 A中的基站 1发送 Message Type信令， 小区 A的 PCI为 1。 ECGI表示 Message Type信令发送小区的全局小区标识。
各小区基站通过 X2 口发送更新信息， 更新信息中必须包含发送方小 区的 PCI, 具体的形式可如下面的描述，但均是用于指示发送方小区是否为 存在干扰的小区。
具体的形式可以如下， 由于小区内用户的测量报告周期上报， 根据前 一次上报的测量报告确定的存在干扰的发送方小区如 PCI为 4的小区 D, 若根据本次上报的测量报告确定不再存在干扰， 则小区 D向小区 A (小区
D的邻小区）发送更新信息， 更新信息包括表 3中的信息， 用于指示小区 D 不再存在干扰。 当然为了后续步骤中能够得到干扰配对小区组， 还可以将 小区 D绑定的 EARFCN增加在更新信息中，如釆用在更新信息的邻小区信 息 Neighbour Information中增加 EARFCN of Cell D实现。
更新群组用户群组号列表
Update of GU Group ID List
~删除的群组用户群组号列表 ~
GU Group Id To Delete List
4(PCI 4) ―
表 3
具体的形式可以如下， 由于小区内用户的测量报告周期上报， 根据前 一次上报的测量报告确定的不存在干扰的发送方小区如 PCI为 3的小区 C, 若根据本次上报的测量报告确定存在干扰， 则小区 C向小区 A (小区 C的 邻小区）发送更新信息， 更新信息包括表 4中的信息， 用于指示小区 C新 增干扰。 当然为了后续步骤中能够得到干扰配对小区组， 还可以将小区 C 绑定的 EARFCN增加在更新信息中。 更新群组用户群组号列表
Update of GU Group ID List
~新增的群组用户群组号列表 ~
GU Group Id To Add List
3(PCI 3)
表 4
具体的形式可以如下， 只有存在干扰的小区（如小区 A、 小区 B、 小区 C和小区 E ) 才通过 X2 口向其邻小区发送 Message Type信令， 进而对于 小区 A存在干扰的小区如小区 B、 小区 C和小区 E会发送更新信息， 更新 信息分别包括表 5B、 表 5C和表 5E中的信息， 指示小区^ 小区 C和小区 E当前存在干扰。
Figure imgf000011_0001
表 5E
而因为小区 D为不存在干扰的小区，则不必向邻小区发送 Message Type 信令， 进而， 邻小区也不会收到小区 D的更新信息。
步骤 60, 接收方小区通过 X2 口接收更新信息得到邻区干扰列表。 例如接收方小区为小区 A, 小区 A根据更新信息得到一个邻区干扰列 表， 邻区干扰列表中的小区与本小区构成了干扰配对小区。 这里假设基站 3 所在小区 C为新增小区， 基站 4所在小区 D为删除小区， 根据最新一次测
PCI, 只是本实施的一个优选的方案， 具体实施时可以在指定的存储空间存 储相邻且存在干扰的小区的 PCI。即在指定空间存储的 PCI都是相邻且存在 干扰的小区的 PCI。
根据前一次上报的测量报告确定的邻区干扰列表一表 6A, 以及表 3. 表 4 中的信息得到一个新的邻区干扰列表一表 6B。
Figure imgf000012_0001
服务小区 更新群组用户群组号列表
信 息 Update of GU Group ID List
邻 小 区 信 息
Served
Neighbour 新增的群组用户群组 删除的群组用户群组 Cell
Information 号列表 号列表
Informati
GU Group Id To Add GU Group Id To Delete on
List List
2(PCI 2)
3 (PCI 3)
Cell A 3(PCI 3) 4(PCI 4)
4(PCI 4)
5(PCI 5) 服务小区 更新群组用户群组号列表
信 息 Update of GU Group ID List
邻 小 区 信 息
Served
Neighbour 新增的群组用户群组 删除的群组用户群组 Cell
Information 号列表 号列表
Informati
GU Group Id To Add GU Group Id To Delete on
List List
EARFCN of Cell B GU Group Id Of Cell C GU Group Id Of Cell D
EARFCN of Cell C
EARFCN of Cell D
EARFCN of Cell E
表 6B
可见由表 6A得到表 6B , 就可以实现根据前一次上报的测量报告确定 的存在干扰的发送方小区的 PCI,和本次上报的测量报告确定的不再存在干 扰的发送方小区的 PCI, 确定与接收方小区相邻且当前存在干扰的小区的 PCL以及根据前一次上报的测量报告确定的存在干扰的发送方小区的 PCI, 和本次上报的测量报告确定的新增干扰的发送方小区的 PCI,确定与接收方 小区相邻且当前存在干扰的小区的 PCI。
小区 A还可以是跟据小区 B、 小区 C和小区 E上报的表 5B、 表 5C和 表 5E中的信息得到表 6C。 更新群组用户群组号列表
Update of GU Group ID List
服务小区信息 邻 小 区 信 息
Served Cell Neighbour 新增的群组用户群 删除的群组用户群 Information Information 组号列表 组号列表
GU Group Id To GU Group Id To Add List Delete List
2(PCI 2)
Cell A 3(PCI 3)
5(PCI 5) 更新群组用户群组号列表
Update of GU Group ID List
服务小区信息 邻 小 区 信 息
Served Cell Neighbour 新增的群组用户群 删除的群组用户群 Information Information 组号列表 组号列表
GU Group Id To GU Group Id To Add List Delete List
EARFCN of Cell B
EARFCN of Cell C
EARFCN of Cell E
表 6C
这样小区 A仅根据存在干扰的小区 （如小区 B、 小区 C和小区 E )发 送的更新信息， 就可以直接确定与小区 A相邻且存在干扰的小区的 PCI。
其中， 本实施例中以得到邻区干扰列表为优选实施例， 通过邻区干扰 列表的方式来实现确定与接收方小区相邻且存在干扰的小区的 PCI,对接收 方小区基站配置进行更新。
相应的， 小区 B的基站 2对小区 A的基站 1进行相同操作， 也收到邻 区小区 C和小区 D的更新信息， 小区 B的邻区干扰列表如下:
Figure imgf000014_0001
表 7 步骤 70, 根据邻区干扰列表建立干扰小区配对列表。
小区 A通过比较小区 B、 小区 C和小区 E的 EARFCN信息， 将邻区 干扰列表中的小区分类得到干扰配对小区组， 同一小区组中所有的小区使 用相同频率， 建立小区配对列表如表 8 , 其中小区 B和小区 E为同一小区 组称为集合 A1 , 该小区组中小区 B和小区 E的频率分配相同， 小区 C为 另一个小区组称为集合 A2。 釆用干扰小区配对列表的方式来表示干扰配对 小区组， 只是本实施的一个优选的方案， 具体实施时， 可以小区 A的 PCI 为索引，在对应的存储空间存储相邻且存在干扰的小区的 PCI, 以此来表示 干扰配对小区组。
Figure imgf000015_0001
表 8
小区 B类似建立小区配对列表如表 9 , 其他小区不再赘述， 整个建立 小区配对列表过程参考附图 3。
Figure imgf000015_0002
表 9
步骤 80, 基于干扰小区配对列表进行 ICIC处理。
通过上述的干扰小区配对列表可以确定干扰配对小区， 进而基于此进 行 ICIC处理， 其原则为， 釆用分时的方式分别提高干扰配对小区中的各小 区基站对其 CEU 的发射功率， 且同一时刻仅提高一个小区基站对其 CEU 的发射功率， 并同步釆用分时的方式分别降低干扰配对小区中的各小区基 站对其 CCU的发射功率， 且同一时刻仅降低一个小区基站对其 CCU的发 射功率， 同步对 CEU发射功率提高的小区和对 CCU发射功率降低的小区 为相邻小区。 通过以下实例可以更改好的理解本发明如何进行 ICIC处理， 设备参数 配置说明：
以下实例中 LTE下行干扰系统， 宏基站， 10MHz带宽， 16QAM调制 方式， 假设基站对小区内用户的初始发射功率为 A ( dBm ), 假设功率调整 步长幅度为 UeOffset ( dBm ) (幅度调整范围根据用户周期上报的测量报告 的干扰情况可做配置 ), 则对 CEU提升后发射功率为 A+UeOffset ( dBm ), 对 CCU降低后发射功率为 A-UeOffset ( dBm )。
功率调整步长 UeOffset为 PDSCH ( Physical Downlink Shared CHannel, 下行物理共享信道）用户级参数， UeOffset的取值见协议 331 中关于 P_A 取值的说明， 取值范围为 {3 , 2, 1 , 0 , -1.77 , -3 , -4.77 , -6dB} , 默认为 3dB ; 边缘 UE 的发射功率等于最大平均发射功率。 这里可根据 TS 36.213(Release 9)里面对 CEU和 CCU上行和下行功率比的支持， 即基于高 层信令所配置的 P_B和天线数设置。
ICIC处理的方法如图 4A所示， 包括：
步骤 801 : 提高小区 A基站对其 CEU的发射功率， 降低集合 A1所有 小区基站对各自 CCU的发射功率， 同时集合 A2中小区基站对各自用户发 射功率保持初始值， 并进入步骤 802。
步骤 802: 小区 A基站对其 CEU发射功率恢复至初始值， 提高集合 A1所有小区的基站对各自 CEU的发射功率， 同时降低集合 A2所有小区基 站对各自 CCU的发射功率。 并进入步骤 803。
步骤 803: 降低小区 A基站对其 CCU的发射功率， 恢复集合 A1所有 小区基站对其中所有用户的发射功率至初始值，同时提高集合 A2所有小区 基站对各自 CEU的发射功率。 并进入步骤 801。
其中集合 A1中包括小区 B, 集合 A2中包括小区 C, 步骤 801、 步骤 802和步骤 803可周期重复执行， 如 Timel时刻执行步骤 801 , Time2时刻 执行步骤 802, Time3时刻执行步骤步骤 803在 Time4时刻与 Timel时刻相 同执行步骤 801。也可以是执行的周期不同， 本发明实施例釆用周期重复执 行。 用户功率调整状态示意图如图 4B所示。
对于小区 A, 在最新的一次测量结果更新之后， 若测量结果表明邻区 仍然存在问题用户， 则小区 A的邻区干扰列表不变。
若测量结果表明邻区， 邻区问题用户已完全不存在 （已下线或移动到 信号较好区域等）， 则小区 A的邻区干扰列表中删去此邻区的 ID。 若此被 删除的小区为某子集最后一个小区，删除该小区 ID后（假设下表 10中 Cell C被删除）：
Figure imgf000017_0001
表 10
则小区 A的基站 1的小区配对列表如表 11：
Figure imgf000017_0002
表 11
即出现小区配对列表中出现单频段划分的小区组， 进行 ICIC处理则需 要如下步骤。
步骤 901: 保持小区 A基站对其 CCU的发射功率初始值同时， 提高小 区 A对其 CEU的发射功率； 并且降低小区集合 A1基站对其 CCU的发射 功率， 对 A1中的 CEU用户发射功率保持初始值。 并进入步骤 902。
步骤 902: 降低小区 A基站对其 CCU的发射功率同时， 对小区 1的 CEU发射功率保持初始值； 对小区集合 A1的 CCU发射功率保持初始值； 提高小区集合 A1基站对其 CEU的发射功率。 再次进入步骤 901。 反之， 在最新的一次测量结果更新之后， 若出现小区配对列表中由单 频段变为两频段划分的小区则跳转执行步骤 801-步骤 803。若出现邻区无配 对小区情况， 则保持小区 A内基站对其 CEU高发射功率模式， 对 CCU发 射功率不变， 直到下次测量结果上报后更新配对列表。
更新列表后， 若小区配对列表中出现两频段划分的小区则跳转到步骤 801-803。 若出现邻区无配对小区情况， 则保持小区 A内基站对其 CEU高 发射功率模式，对 CCU发射功率不变， 直到最近一次测量小区 A无问题用 户， 结束本方法， 小区各项配置恢复初始值。
小区 A、 小区 B和小区 C釆用不同的频段划分方式。
第一时刻， 同步骤 801。
第二时刻， 同步骤 802。
某个时刻 K, 小区 C不存在的问题用户 （这些用户业务结束下线， 或 者移出该位置）， 小区干扰列表中小区 C被删去。
时刻 K+1开始直到下次测量更新， 执行两小区场景的方案步骤 901-步 骤 902。
某个时刻 L, 小区 B在干扰列表中被删去， 此时小区 A单步提高边缘 发射功率直到某个时刻自己也退出。 本小区退出后， 该小区邻区干扰列表 和干扰配对列表随即清空。 对应图 4C。
关于本方法的时间策略的说明：小区间 X2口交互时延小于用户周期性 上报测量时延， 也就是说本发明实施例方案的使用和终止的时间不小于这 个值， 不宜过于频繁的让基站在正常发射模式和本发明中的方法模式之间 转换。 也就是每次功率升降的时间调整粒度 T, 每个基站的时间都相同， 公 平由此而来。 T不宜间隔较短（避免功放频繁升降的器件损耗）， 也不宜过 长（几百毫秒做一次时间轮询必定损失一部分小区的吞吐量）。 这里建议按 照小区测量周期做调整， 如上报测量报告周期为 120ms或者 240ms, 并且 小区的初始时间轮询周期要大于测量报告周期， 之后的时间轮询周期可以 低于测量报告周期。
由于， 每个小区的功率升降的时间粒度 T都是相同的， 动态的调整配 对小区内部每个小区的 T, 打破原先的小区 A、 小区子集 A1 和小区子集 A2之间公平的时间粒度， 给那些覆盖和质量极差的问题用户小区更多的功 率提升优先级， 以调整不均衡网络内每个基站时间粒度的个性化。
综上所述， 使用本发明所提出的半静态 ICIC方法， 一方面让存在覆盖 和质量问题用户的邻小区配对、 使用时分的方法进行功率分配， 并通过公 平的时间粒度升降功率达到降低干扰， 改善 CEU吞吐率。 另一方面， 灵活 的半静态方案选择可以降低系统开销， 适应现网的环境变化。
本发明的实施例提供第二实施例是一种长期演进下行系统的小区间干 扰协调装置， 如图 5所示， 包括：
信令接收模块 1001 , 用于通过 X2 口接收相邻小区发送的消息类型信 令， 用于指示在 ICIC模式下对基站配置进行更新；
信息接收模块 1002, 用于在 ICIC模式下接收更新信息， 所述更新信息 用于指示发送方小区是否为存在干扰的小区， 发送方小区根据小区内用户 的测量报告确定是否为存在干扰的小区；
处理模块 1003 , 用于根据所述更新信息， 确定与本小区相邻且存在干 扰的小区， 若本小区为存在干扰的小区， 将本小区和存在干扰的相邻小区 配对得到干扰配对小区， 基于所述干扰配对小区进行 ICIC处理。
进一步， 信息接收模块 1002, 还用于根据前一次上报的测量报告确定 的存在干扰的发送方小区， 若根据本次上报的测量报告确定不再存在干扰， 则向其相邻小区发送的更新信息为指示该发送方小区不再存在干扰， 在 ICIC模式下接收更新信息，更新信息用于指示该发送方小区不再存在干扰。
进一步， 信息接收模块 1002, 还用于根据前一次上报的测量报告确定 的不存在干扰的发送方小区， 若根据本次上报的测量报告确定存在干扰， 则向其相邻小区发送的更新信息为指示该发送方小区新增干扰， 在 ICIC模 式下接收更新信息， 更新信息用于指示该发送方小区新增干扰。 进一步， 信令接收模块 1001 , 还用于通过 X2 口接收相邻小区发送的 消息类型信令， 发送消息类型信令的小区为存在干扰的小区；
处理模块 1003 , 还用于仅根据存在干扰的小区发送的更新信息， 直接 确定相邻且存在干扰的小区。
进一步， 信息接收模块 1002, 还用于在 ICIC模式下接收更新信息， 更 新信息携带 PCI。
进一步， 信息接收模块 1002, 还用于接收更新信息， 更新信息包含发 送方小区的频率分配信息；
处理模块 1003 , 还用于将本小区和存在干扰的相邻小区配对得到干扰 配对小区组， 基于干扰配对小区组进行 ICIC处理， 各小区组中小区的频率 划分方式相同。 本发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权 利要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在 内。 工业实用性
本发明实施例的主要目的在于提供一种长期演进下行系统的小区间干 扰协调方法及装置，解决 LTE下行系统中现有 ICIC方案对干扰的抑制效果 较差的问题。 本发明的具体实施方案中， 正是由于基于 X2 口发送消息类 型信令， 配对得到干扰配对小区， 并基于干扰配对小区进行 ICIC处理， 改 善 CEU 面临的信号覆盖和质量问题， 提高其吞吐率，尽量避免对其它小区 产生影响， 使得从整体上提高对干扰的抑制效果。

Claims

权利要求书
1、一种长期演进下行系统的小区间干扰协调方法，其特征在于， 包括： 通过 X2 口接收相邻小区发送的消息类型信令， 用于指示在小区间干 扰协调 ICIC模式下对基站配置进行更新；
在 ICIC模式下接收更新信息， 所述更新信息用于指示发送方小区是否 为存在干扰的小区， 发送方小区根据小区内用户的测量报告确定是否为存 在干扰的小区；
根据所述更新信息， 确定与本小区相邻且存在干扰的小区， 若本小区 为存在干扰的小区， 将本小区和存在干扰的相邻小区配对得到干扰配对小 区， 基于所述干扰配对小区进行 ICIC处理。
2、 如权利要求 1所述的方法， 其特征在于， 所述在 ICIC模式下接收 更新信息， 具体为： 根据前一次上报的测量报告确定的存在干扰的发送方 小区， 若根据本次上报的测量报告确定不再存在干扰， 则向其相邻小区发 送的更新信息为指示该发送方小区不再存在干扰， 在 ICIC模式下接收更新 信息， 所述更新信息用于指示该发送方小区不再存在干扰。
3、 如权利要求 1所述的方法， 其特征在于， 所述在 ICIC模式下接收 更新信息， 具体为： 根据前一次上报的测量报告确定的不存在干扰的发送 方小区， 若根据本次上报的测量报告确定存在干扰， 则向其相邻小区发送 的更新信息为指示该发送方小区新增干扰， 在 ICIC模式下接收更新信息， 所述更新信息用于指示该发送方小区新增干扰。
4、 如权利要求 1所述的方法， 其特征在于，
所述通过 X2 口接收相邻小区发送的消息类型信令， 具体为： 通过 X2 口接收相邻小区发送的消息类型信令， 发送消息类型信令的小区为存在干 扰的小区；
所述根据更新信息确定相邻且存在干扰的小区， 具体为： 仅根据存在 干扰的小区发送的更新信息， 直接确定相邻且存在干扰的小区。
5、 如权利要求 1所述的方法， 其特征在于， 所述在 ICIC模式下接收 更新信息具体为： 在 ICIC模式下接收更新信息， 所述更新信息携带物理小 区标识 PCI。
6、 如权利要求 1至 5任一权利要求所述的方法， 其特征在于， 所述接收更新信息， 具体为： 接收更新信息， 所述更新信息包含发送 方小区的频率分配信息；
所述将本小区和存在干扰的相邻小区配对得到干扰配对小区， 基于干 扰配对小区进行 ICIC处理， 具体为： 将本小区和存在干扰的相邻小区配对 得到干扰配对小区组， 基于干扰配对小区组进行 ICIC处理， 各小区组中小 区的频率划分方式相同。
7、 如权利要求 6所述的方法， 其特征在于， 所述基于干扰配对小区组 进行 ICIC处理， 具体为：
釆用分时的方式分别提高干扰配对小区组中的各小区基站对其边缘用 户 CEU的发射功率， 且同一时刻仅提高一个小区基站对其 CEU的发射功 率；
并同步釆用分时的方式分别降低干扰配对小区组中的各小区基站对其 中心用户 CCU的发射功率， 且同一时刻仅降低一个小区基站对其 CCU的 发射功率， 同步对 CEU发射功率提高的小区和对 CCU发射功率降低的小 区为相邻小区。
8、一种长期演进下行系统的小区间干扰协调装置，其特征在于， 包括： 信令接收模块， 用于通过 X2 口接收相邻小区发送的消息类型信令， 用于指示在 ICIC模式下对基站配置进行更新；
信息接收模块， 用于在 ICIC模式下接收更新信息， 所述更新信息用于 指示发送方小区是否为存在干扰的小区， 发送方小区根据小区内用户的测 量报告确定是否为存在干扰的小区；
处理模块， 用于根据所述更新信息， 确定与本小区相邻且存在干扰的 小区， 若本小区为存在干扰的小区， 将本小区和存在干扰的相邻小区配对 得到干扰配对小区， 基于所述干扰配对小区进行 ICIC处理。
9、 如权利要求 8所述的装置， 其特征在于， 所述信息接收模块， 还用 于： 根据前一次上报的测量报告确定的存在干扰的发送方小区， 若根据本 次上报的测量报告确定不再存在干扰， 则向其相邻小区发送的更新信息为 指示该发送方小区不再存在干扰， 在 ICIC模式下接收更新信息， 所述更新 信息用于指示该发送方小区不再存在干扰。
10、 如权利要求 8所述的装置， 其特征在于， 所述信息接收模块， 还 用于： 根据前一次上报的测量报告确定的不存在干扰的发送方小区， 若根 据本次上报的测量报告确定存在干扰， 则向其相邻小区发送的更新信息为 指示该发送方小区新增干扰， 在 ICIC模式下接收更新信息， 所述更新信息 用于指示该发送方小区新增干扰。
11、 如权利要求 8所述的装置， 其特征在于，
所述信令接收模块， 还用于： 通过 X2 口接收相邻小区发送的消息类 型信令， 发送消息类型信令的小区为存在干扰的小区；
所述处理模块， 还用于： 仅根据存在干扰的小区发送的更新信息， 直 接确定相邻且存在干扰的小区。
12、 如权利要求 8所述的装置， 其特征在于， 所述信息接收模块， 还 用于： 在 ICIC模式下接收更新信息， 所述更新信息携带 PCI。
13、 如权利要求 8至 12任一权利要求所述的装置， 其特征在于， 所述信息接收模块， 还用于： 接收更新信息， 所述更新信息包含发送 方小区的频率分配信息；
所述处理模块， 还用于： 将本小区和存在干扰的相邻小区配对得到干 扰配对小区组， 基于干扰配对小区组进行 ICIC处理， 各小区组中小区的频 率划分方式相同。
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