WO2012019366A1 - 基于正交频分复用方案的基站及其中的干扰协调方法 - Google Patents

基于正交频分复用方案的基站及其中的干扰协调方法 Download PDF

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Publication number
WO2012019366A1
WO2012019366A1 PCT/CN2010/075991 CN2010075991W WO2012019366A1 WO 2012019366 A1 WO2012019366 A1 WO 2012019366A1 CN 2010075991 W CN2010075991 W CN 2010075991W WO 2012019366 A1 WO2012019366 A1 WO 2012019366A1
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WIPO (PCT)
Prior art keywords
interference
base station
physical resource
resource block
interference coordination
Prior art date
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PCT/CN2010/075991
Other languages
English (en)
French (fr)
Inventor
张翼
张元涛
周华
王轶
吴建明
Original Assignee
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to KR1020137003645A priority Critical patent/KR101446448B1/ko
Priority to JP2013523456A priority patent/JP5655946B2/ja
Priority to EP10855787.7A priority patent/EP2605579A1/en
Priority to CN2010800685634A priority patent/CN103069874A/zh
Priority to PCT/CN2010/075991 priority patent/WO2012019366A1/zh
Publication of WO2012019366A1 publication Critical patent/WO2012019366A1/zh
Priority to US13/757,265 priority patent/US20130163570A1/en

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Classifications

    • 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
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]

Definitions

  • Base station based on orthogonal frequency division multiplexing scheme and interference coordination method thereof
  • the present invention relates to wireless communication technologies, and more particularly to a base station based on an Orthogonal Frequency Division Multiplexing (OFDM) scheme and an interference coordination method therefor.
  • OFDM Orthogonal Frequency Division Multiplexing
  • LTE-Advanced advanced long-term evolution scheme
  • RRH Remote Radio Head
  • LTE-A system can increase the capacity of the system by deploying new wireless nodes and provide better services for users in special areas. Optimize system performance.
  • the Next Generation Radiocommunication System Long Term Evolution adopts Fractional Frequency Reuse (FFR).
  • FFR Fractional Frequency Reuse
  • all frequency resources can be scheduled for the central user and can be used for edge users of different cells.
  • the system schedules some non-overlapping frequency resources.
  • An embodiment of the present invention is a base station based on an orthogonal frequency division multiplexing scheme.
  • the base station may include an interference assessment unit and an interference coordination request unit.
  • Interference evaluation unit can Estimating an interference state of each physical resource block according to the feedback information from the user equipment, where the physical resource block is greater than or equal to a first threshold and less than or equal to a second threshold higher than the first threshold The interference is assessed as a medium interference state.
  • the interference coordination request unit may transmit the interference coordination request to the one or more predetermined base stations in response to at least the evaluation of the medium interference state.
  • the interference coordination request may include information indicating an interference status of the physical resource block.
  • An embodiment of the invention is a wireless communication system comprising at least one user equipment and at least one base station as described above.
  • An embodiment of the present invention is a base station based on an orthogonal frequency division multiplexing scheme.
  • the base station can include a receiving unit and a power adjustment unit.
  • the receiving unit can receive an interference coordination request from one or more predetermined base stations.
  • the interference coordination request may include information indicating an interference status of each physical resource block evaluated by the base station from which the interference coordination request is derived.
  • the power adjustment unit may reduce the transmission power of the indicated physical resource block if the information indicates a physical resource block that is in a medium interference state.
  • An embodiment of the present invention is an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme.
  • the interference state of each physical resource block may be evaluated according to the feedback information from the user equipment, where the interference of the physical resource block is greater than or equal to the first threshold and less than or equal to the second threshold higher than the first threshold, The interference of the physical resource block is evaluated as a medium interference state.
  • the interference coordination request can be transmitted to one or more predetermined base stations in response to at least an assessment of the medium interference state.
  • the interference coordination request may contain information indicating the interference status of the physical resource block.
  • An embodiment of the present invention is an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme.
  • an interference coordination request from one or more predetermined base stations can be received.
  • the interference coordination request may include information indicating an interference status of each physical resource block evaluated by the base station from which the interference coordination request is derived.
  • the transmission power of the indicated physical resource block can be reduced if the information indicates a physical resource block that is in a medium interference state.
  • FIG. 1 shows an exemplary scenario in which interference coordination is required.
  • Figure 2 shows another exemplary scenario that requires interference coordination.
  • FIG. 3 is a block diagram showing an exemplary structure of a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing an exemplary structure of a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 5 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 6 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 7 is a block diagram showing an exemplary structure of a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 8 shows a case where the base station multiplexes the indicated physical resource blocks of the high interference state in a time division manner.
  • FIG. 9 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing an example of a structure of a user equipment.
  • Figure 11 is a block diagram showing an exemplary structure of a computer in which the apparatus and method of the present invention are implemented.
  • FIG. 1 illustrates an exemplary scenario in which interference coordination is required, where a femto cell forms interference with a macro cell.
  • the macro base station 101 serves the macro cell 102.
  • ⁇ pico base station 103 servos ⁇ pico cell 104.
  • the femto cell 104 serves the subscribed user equipment group.
  • Macro cell 102 serves all user equipment.
  • the user equipment 105 served by the macro cell 102 ⁇ the femto cell 104 if the user equipment 105 is subordinate to the user equipment group subscribed to the femto cell 104, it can switch to the femto cell 104 to accept the service of the femto base station 103. If it is not subordinate to the user equipment group that subscribes to the femto cell 104, it will be strongly interfered by the channel of the femto cell 104 occupying the same transmission resource. Specifically, the downlink channel iM of the femto cell 104 "the downlink channel of the macro cell 102 generates interference. Therefore, interference coordination between the femto cell 104 and the macro cell 102 is required.
  • FIG. 2 illustrates another exemplary scenario in which interference coordination is required, in which a macro cell forms interference with a pico cell.
  • the macro base station 201 serves the macro cell 202.
  • pico base station 203 is served to pico cell 204.
  • the picocell 204 employs a Range Expansion technique in order to increase the capacity of the system.
  • the user equipment 205 subscribing to the femto cell 204 and at its edge may be subject to significant interference from the macro cell 202.
  • the downlink channel of the macro cell 202 is interfered with by the downlink channel of the pico cell 204. Therefore, interference coordination between macro cells and pico cells is required.
  • FIG. 3 is a block diagram showing an exemplary structure of a base station 300 based on an orthogonal frequency division multiplexing scheme, according to an embodiment of the present invention.
  • the base station 300 includes an interference assessment unit 301 and an interference coordination request unit 302.
  • the interference evaluation unit 301 evaluates the interference status of each physical resource block based on feedback information from the user equipment, such as the user equipment 304.
  • Various known interference metrics can be used to measure the interference of physical resource blocks.
  • the user equipment can feed back corresponding feedback information for estimating interference. For example, in signal strength such as carrier-to-interference ratio and signal-to-noise ratio
  • the interference can be estimated according to the reference signal received by the user equipment and the reference signal transmission power.
  • the interference can be estimated according to the channel quality information fed back by the user equipment.
  • the interference evaluation unit 301 can evaluate the interference state based on the magnitude of the interference of the physical resource block. Specifically, a first threshold and a second threshold higher than the first threshold may be set. In a case where the interference of the physical resource block is greater than or equal to the first threshold and less than or equal to the second threshold higher than the first threshold, the interference estimating unit 301 evaluates the interference of the physical resource block as the medium interference state.
  • the interference coordination request unit 302 transmits an interference coordination request to one or more predetermined base stations, such as the base station 303, in response to the evaluation of the medium interference state.
  • the interference coordination request may include information indicating an interference state of the physical resource block, that is, a medium interference state.
  • a medium interference state may be included in the interference coordination request.
  • the base station can issue an interference coordination request to the one or more predetermined base stations.
  • the interference assessment unit 301 can also evaluate other interference states. For example, in the case where the interference of the physical resource block is less than the first threshold, the interference assessment unit 301 can evaluate the interference of the physical resource block as a low interference state. For another example, in the case where the interference of the physical resource block is greater than the second threshold, the interference evaluation unit 301 can evaluate the interference of the physical resource block as a high interference state. Accordingly, the interference coordination request may further include information indicating that the physical resource block is in a low interference state, or information indicating that the physical resource block is in a high interference state, or both.
  • the interference coordination request unit 302 can perform the evaluation periodically or in response to receiving feedback from the user equipment.
  • the interference coordination request unit 302 can also transmit the interference coordination request periodically, in response to the evaluation of the high interference state.
  • the transmission period of the interference coordination request is determined by the physical transmission medium and system delay between the base stations. For example, in the case of transmitting an interference coordination request using the X2 interface, the update time is greater than 20 sec.
  • the base station that receives the interference coordination request may not perform interference coordination processing when no interference coordination is found, for example, when all physical resource blocks are in a low interference state.
  • FIG. 3 illustrates a wireless communication system including at least one user equipment, such as user equipment 304, and at least one base station, such as base station 300.
  • the user equipment in the wireless communication system may include a transmitter configured to transmit information about the interference.
  • the user equipment can obtain information about the interference by measuring the downlink channel, so that the receiver can feed back to the base station.
  • Fig. 10 shows an example of the structure of the user equipment.
  • user equipment 1000 includes a transmitter 1001 for transmitting information about interference.
  • FIG. 4 is a block diagram showing an exemplary structure of a base station 400 based on an orthogonal frequency division multiplexing scheme, according to an embodiment of the present invention.
  • the base station 400 includes a receiving unit 401 and a power adjusting unit 402.
  • the receiving unit 401 receives an interference coordination request from one or more predetermined base stations, such as the base station 300.
  • the interference coordination request may include information indicating the interference status of each physical resource block as assessed by the base station from which the interference coordination request originated, e.g., base station 300.
  • the power adjustment unit 402 reduces the transmission power of the indicated physical resource block in the case where the information indicates a physical resource block in a medium interference state.
  • base stations 300 and 400 perform downlink transmissions to respective served user equipments 304 and 404, respectively, with physical resource blocks.
  • the interference coordination request including the information indicating that the physical resource block is in the medium interference state is transmitted to the base station 400.
  • the base station 400 receives the interference coordination request and correspondingly reduces the transmission power of the physical resource block indicated by the interference coordination request. Interference to downlink transmissions from base station 300 to user equipment 304 can then be reduced and does not have a significant impact on the quality of downlink transmissions from base station 400 to user equipment 404. In this way, complex operations such as rescheduling physical resource blocks can be avoided.
  • the base station 300 may be a base station of the interfered cell, and the base station 400 may be a base station of the interfering cell.
  • base station 300 can be base station 101 of macro cell 102, which can be base station 103 of femto cell 104.
  • base station 300 can be base station 203 of pico cell 204, which can be base station 201 of macro cell 202.
  • the base station can also be configured to include the components of base stations 300 and 400.
  • only one base station 303 that issues an interference coordination request is shown in FIG.
  • the base station 400 there may be more than one base station of a cell that may be interfered by the base station 400.
  • one or more predetermined base stations may be set according to the cell configuration as base stations of possible interfered cells.
  • the base station may receive an interference coordination request from the one or more predetermined base stations.
  • FIG. 5 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • the method begins at step 500.
  • the interference state of each physical resource block is evaluated according to the feedback information from the user equipment, where the interference of the physical resource block is greater than or equal to the first threshold and less than or equal to the second threshold higher than the first threshold, The interference of the physical resource block is evaluated as a medium interference state.
  • step 504 it is determined whether a physical resource block in a medium interference state is evaluated. If not, the method ends at step 508. If the physical resource block in the medium interference state is evaluated, proceed to step 506.
  • an interference coordination request is transmitted to one or more predetermined base stations in response to the evaluation of the medium interference state.
  • the interference coordination request includes information indicating an interference status of the physical resource block.
  • the method then ends at step 508.
  • one or more predetermined base stations can be set according to the cell configuration as a possible source of interference.
  • the base station can issue an interference coordination request to the one or more predetermined base stations.
  • the user equipment can transmit information regarding the interference.
  • the user equipment can obtain information about the interference by measuring the downlink channel, thereby feeding back to the base station.
  • FIG. 6 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme according to an embodiment of the present invention.
  • the method begins at step 600.
  • an interference coordination request is received from one or more predetermined base stations.
  • the interference coordination request includes information indicating the interference status of each physical resource block evaluated by the base station from which the interference coordination request is derived.
  • step 604 determining if the interference coordination request includes an indication that is in a medium interference Information about the physical resource block. If not, the method ends at step 608. If so, proceed to step 606.
  • step 606 the transmit power of the indicated physical resource block is reduced. The method then ends at step 608.
  • interference states can also be evaluated.
  • the interference of the physical resource block in the case where the interference of the physical resource block is less than the first threshold, the interference of the physical resource block can be evaluated as a low interference state.
  • the interference of the physical resource block if the interference of the physical resource block is greater than the second threshold, the interference of the physical resource block may be evaluated as a high interference state.
  • the interference coordination request may further include information indicating that the physical resource block is in a low interference state, or information indicating that the physical resource block is in a high interference state, or both.
  • the assessment can be made periodically or in response to feedback from the receiving user equipment.
  • Interference coordination requests may also be transmitted periodically, in response to an assessment of high interference conditions. It is decided on a regular basis. For example, when using X2 to connect and transmitting ⁇ coordination request, the more ⁇ time is greater than 20 sec.
  • interference coordination processing may not be performed.
  • FIG. 7 is a block diagram showing an exemplary structure of a base station 700 based on an orthogonal frequency division multiplexing scheme, according to an embodiment of the present invention.
  • the base station 700 includes a receiving unit 701, a power adjusting unit 702, and a resource scheduling unit 703.
  • the receiving unit 701 and the power adjusting unit 702 have the same functions as the receiving unit 401 and the power adjusting unit 402 described with reference to Fig. 4, respectively, and thus detailed description thereof is omitted here.
  • the resource scheduling unit 703 performs scheduling to make the base station 700 and the base station from which the corresponding interference coordination request comes from, for example, the base station 300, in a time division manner, in the case where the information included in the interference coordination request indicates the physical resource block in the high interference state.
  • the subframes in the time domain are mapped to the physical resource blocks of the indicated high interference state. Different subframes in the time domain may be allocated to a base station that issues an interference coordination request (e.g., base station 300) and a base station that receives an interference coordination request (e.g., base station 700). There can be different ways of allocating subframes.
  • odd/even sub-frames can be divided It is allocated to one base station, and the even/odd subframe is allocated to the other base station.
  • the sequence of sub-frames can also be divided into periods.
  • subframes are allocated according to a predetermined allocation ratio and an allocation pattern.
  • the allocation ratio refers to the ratio of the number of subframes allocated to one base station in a period to the number of subframes allocated to another base station.
  • the allocation ratio may be fixed, or may be set by the entity in the core network responsible for setting configuration information of cells (eg, macro cell, pico cell, and pico cell) in the heterogeneous network when the system is initially configured.
  • the allocation ratio can be specified as needed, for example 1: 1: 1, 1: 1: 1:9,
  • the allocation mode refers to which subframes in the period are allocated to one base station according to a predetermined allocation ratio, and which subframes in the period are allocated to the other base station.
  • the diagram of Fig. 8 shows an exemplary scenario in which the base station 700 and the base station 300 multiplex the indicated high resource state physical resource blocks in a time division manner.
  • the interference coordination request includes information indicating that the physical resource blocks to which the subframes 2, 5, and 6 are mapped are in a high interference state.
  • the resource scheduling unit 703 allocates the even subframes to the base station 300, and assigns the odd subframes to the base station 700.
  • the resource scheduling unit 703 may notify the allocation information to a portion (not shown) that implements resource scheduling such that downlink communication between the base station 700 and the user equipment 404 does not use a subframe that is not allocated thereto.
  • the resource scheduling unit 703 also notifies the portion (not shown) in the base station 300 that the resource scheduling is implemented, so that the downlink communication between the base station 300 and the user equipment 304 does not use the subframes that are not allocated thereto.
  • the physical resource blocks of the indicated high interference state are multiplexed by the two base stations in a time division manner in the example described with reference to FIGS. 7 and 8, if the base station receives an interference coordination indication from more than one predetermined base station And the interference coordination indications all indicate that the same physical resource block is in a high interference state, and the resource scheduling unit 703 can also perform scheduling, so that the indicated high interference state is multiplexed in the time division manner between the base station 400 and the predetermined base stations. Physical resource block. Accordingly, the allocation mode and the allocation ratio on which it is based also involve more than two base stations.
  • FIG. 9 is a flow chart showing an interference coordination method in a base station based on an orthogonal frequency division multiplexing scheme, according to an embodiment of the present invention.
  • the method begins at step 900.
  • an interference coordination request is received from one or more predetermined base stations.
  • the interference coordination request includes information indicating an interference status of each physical resource block evaluated by the base station from which the interference coordination request is derived.
  • step 904 it is determined whether the interference coordination request includes information indicating a physical resource block in a medium interference state. If not, proceed to step 908 to end. If so, proceed to step 906.
  • step 906 the transmit power of the indicated physical resource block is reduced. The method then proceeds to step 908 to end.
  • step 908 it is determined whether the interference coordination request includes information indicating a physical resource block in a high interference state. If not, the method ends at step 912. If yes, proceed to step 910.
  • step 910 scheduling is performed to cause the base station receiving the interference scheduling request and the base station from which the corresponding interference coordination request is derived to multiplex the indicated physical resource blocks of the high interference state in a time division manner.
  • the subframes in the time domain are mapped to the physical resource blocks of the indicated high interference state.
  • Different subframes in the time domain may be allocated to the base station that issued the interference coordination request and the base station that receives the interference coordination request.
  • There can be different ways of allocating subframes For example, odd/even subframes may be assigned to one base station, and even/odd subframes may be allocated to another base station.
  • the sequence of sub-frames can also be divided into periods.
  • the allocation ratio refers to the ratio of the number of subframes allocated to one base station in a period to the number of subframes allocated to another base station.
  • the allocation ratio can be specified as needed, for example 1: 1, 1:2 1:9,
  • the allocation mode refers to which subframes in the period are allocated to one base station according to a predetermined allocation ratio, and which subframes in the period are allocated to the other base station. The method then ends at step 912.
  • step 904 is performed prior to the determination of step 908, the determination of step 904 is performed after the determination of step 908.
  • the physical resource blocks of the indicated high interference state are multiplexed by the two base stations in a time division manner in the example described in connection with FIG. 9, if the base station receives interference coordination indications from more than one predetermined base station and these interferences
  • the information contained in the coordination indication indicates that the same physical resource block is in a high interference state, and then scheduling can also be performed, so that the receiving is performed.
  • a physical resource block of the indicated high interference state is multiplexed between the base station that interferes with the coordination request and the predetermined base stations in a time division manner.
  • the allocation pattern and the allocation ratio on which it is based also involve more than two base stations.
  • the difference between the pre-power and the adjusted power may be adjusted according to a predetermined adjustment amount (step size) to reduce the transmission power.
  • step size can be, 3dB.
  • the interference coordination request may also include adjustment information associated with the physical resource block in a medium interference state.
  • the adjustment information indicates the relevant power adjustment amount.
  • the power adjustment can define the step size.
  • the power adjustment amount can also define the adjustment ratio, such as the ratio of the adjusted power to the power before adjustment.
  • the adjustment ratio can be a fixed ratio, such as 1/2, 1/3, and so on.
  • the power adjustment amount can be a fixed length (n bits) bit string. Different valued bit strings correspond to different adjustment ratios. Table 1 shows an example of the correspondence between the bit string value and the adjustment ratio.
  • the base station that issued the interference coordination request can determine the power adjustment based on the strength of the current interference. If the interference intensity is large, a power adjustment amount capable of rapidly reducing the transmission power can be employed. If the interference strength is not large, a power adjustment amount capable of slowly reducing the transmission power can be employed.
  • Interference coordination requests can be transmitted between base stations by various means of communication. For example, it can be wired (eg cable, fiber optic cable, etc.) or wireless (eg microwave, satellite, etc.) Communication mode is transmitted. For example, the transmission can be via a dedicated link or network. In one exemplary implementation, the transfer may be through an interface such as X2, Sl, air interface, or the like.
  • the interference coordination request can be in accordance with the requirements of the specific protocol used.
  • the interference coordination request may include a relative narrowband transmission energy (RNTP) value associated with the physical resource block, wherein when the RNTP value is a specific value, the interference indicating the associated physical resource block is in a medium interference state.
  • RNTP relative narrowband transmission energy
  • the RNTP value can be represented by two or four bits. For example, RNTP values equal to 2, 1 and 0 indicate a high interference state, a medium interference state, and a low interference state, respectively.
  • embodiments of the present invention have been described above in connection with inter-cell interference in a heterogeneous network in an LTE-A system, embodiments of the present invention are also applicable to wireless communications such as Worldwide Interoperability for Microwave Access (WiM AX). system.
  • WiM AX Worldwide Interoperability for Microwave Access
  • Embodiments of the present invention are compatible with LTE-A Rel. 8/9 user equipment and have only a small impact on the physical layer air interface.
  • the embodiment of the present invention obtains a better interference coordination effect by the power adjustment method, wherein the power reuse method is further adopted for the medium interference user to further increase the resource reuse efficiency and improve the system transmission efficiency.
  • the interference coordination scheme of the present invention is suitable as an elCIC scheme for an LTE-A data channel.
  • the present invention can be embodied as a system, method, or computer program product. Accordingly, the present invention may be embodied in the form of complete hardware, complete software (including firmware, resident software, microcode, etc.), or generally referred to herein as "circuit,” “module,” or “system. "The combination of the software part and the hardware part. Furthermore, the invention can take the form of a computer program product embodied in any tangible medium of expression, which contains computer-available program code.
  • the computer readable medium can be a computer readable signal medium or a computer readable storage medium, which can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor.
  • a more specific example (non-exhaustive list) of computer readable storage media shields includes the following: electrical connections with one or more wires, portable computer disks, Hard disk, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash), optical fiber, portable compact disk read only memory (CD-ROM), optical storage device, magnetic A storage device, or any suitable combination of the foregoing.
  • a computer readable storage medium may be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device.
  • a computer readable signal medium may comprise a data signal with a computer readable program code, for example, propagated in the baseband or as part of a carrier. Such a propagated signal can take any suitable form including, but not limited to, electromagnetic, optical, or any suitable combination thereof.
  • the computer readable signal shield may be any one of a computer readable storage medium that can communicate, propagate or transfer a program for use with or in connection with an instruction execution system, apparatus or device.
  • Program code embodied on a computer readable medium can be transmitted by any suitable medium, including but not limited to - wireless, wireline, optical cable, radio frequency, etc., or any suitable combination of the above.
  • Computer program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++. Also included are conventional procedural programming languages such as the "C" programming language or similar programming languages.
  • the program code can be executed entirely on the user's computing, partly on the user's computer, as a stand-alone software package, partly on the user's computer, partly on a remote computer, or entirely on a remote computer or server. carried out.
  • the remote computer can be connected to the user's computer via any kind of network, including a local area network (LAN) or wide area network (WAN), or can be connected (eg, via an Internet service provider via the Internet) Go to an external computer.
  • LAN local area network
  • WAN wide area network
  • Internet service provider via the Internet
  • FIG. 11 is a block diagram showing an exemplary structure of a computer in which the apparatus and method of the present invention are implemented.
  • the central processing unit (CPU) 110l performs various processing in accordance with a program stored in the read-only mapped data (ROM) 1102 or a program loaded from the storage portion 1108 to the program-accumulated map data (RAM) 1103. .
  • the RAM 1103 data required when the CPU 1101 executes various processes and the like is also stored as needed.
  • the CPU 1101, the ROM 1102, and the RAM 1103 are connected to each other via a bus 1104.
  • Input/output interface 1105 is also coupled to bus 1104.
  • the following components are connected to the input/output interface 1105: an input portion 1106 including a keyboard, a mouse, etc.; an output portion 1107 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker And so on; a storage portion 1108 including a hard disk or the like; and a communication portion 1109 including a network interface card such as a LAN card, a modem, and the like.
  • the communication section 1109 performs communication processing via a network such as the Internet.
  • the drive 1110 is also connected to the input/output interface 1105 as needed.
  • a detachable medium 1111 such as a magnetic disk, an optical disk, a magneto-optical disk, semiconductor mapping data, and the like are mounted on the drive 1110 as needed, so that the computer program read therefrom is installed into the storage portion 1108 as needed.
  • a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 1111.
  • such a storage medium is not limited to the removable medium 1111 shown in FIG. 11 in which a program is stored and distributed separately from the method to provide a program to a user.
  • the detachable medium 1111 include a magnetic disk, an optical disk (including a CD-ROM and a digital versatile disk (DVD)), a magneto-optical disk (including a mini disk (MD), and semiconductor mapping data.
  • the storage medium may It is a ROM 1102, a hard disk included in the storage section 1108, and the like, in which programs are stored, and distributed to the user together with the method including them.

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Description

基于正交频分复用方案的基站及其中的干扰协调方法
技术领域
[01] 本发明涉及无线通信技术， 更具体地说， 涉及基于正交频分复 用（OFDM)方案的基站及其中的干扰协调方法。
背景技术
[02] 在基于 OFDM方案的无线通信系统中，较大的小区中可以存在 更小的小区。 这些小区可以共用相同的频率资源。 例如， 在下一代 无线通信系统高级长期演进方案（ LTE-Advanced )中， 引入了异构 网^ ( Heterogeneous Network )„LTE-A系统可以包括宏小区（ Macro Cell )、 亳微微小区 （Femto Cell )、 微微小区 （Pico Cell )、 远端无 线头（RRH )、 中继器（ Relay )。 LTE-A 系统可以通过部署新的无 线节点来提高系统的容量、 为特殊区域的用户提供更好的服务、 优 化系统性能。
[03] 另一方面， 新部署的节点可能会对原来部署的小区的用户带来 干扰， 甚至造成某些覆盖孔洞。 因此， 需要通过增强的小区间干扰 协调 ( enhanced Inter -Cell Interference Coordination, elCIC )方 法来进一步优化系统性能。
[04] 下一代无线通信系统长期演进方案 (LTE)采用了部分频率重用 ( Fractional Frequency Reuse, FFR )„根据 FFR, 可以为中心用户 调度全部频率资源， 并且可以为不同小区的边缘用户有 P艮制地调度 部分不重叠的频率资源。
发明内容
[05] 本发明的一个实施例是一种基于正交频分复用方案的基站。 基 站可以包括干扰评估单元和干扰协调请求单元。 干扰评估单元可以 根据来自用户设备的反馈信息评估各个物理资源块的干扰状态， 其 中在物理资源块的干扰大于等于第一阈值并且小于等于比第一阈值 高的第二阈值的情况下， 把该物理资源块的干扰评估为中等干扰状 态。 干扰协调请求单元可以至少响应于中等干扰状态的评估， 向一 个或多个预定基站传送干扰协调请求。 干扰协调请求可以包含指示 物理资源块的干扰状态的信息。
[06] 本发明的一个实施例是一种无线通信系统， 包括至少一个用户 设备和至少一个如上所述的基站。
[07] 本发明的一个实施例是一种基于正交频分复用方案的基站。 基 站可以包括接收单元和功率调整单元。 接收单元可以接收来自一个 或多个预定基站的干扰协调请求。 干扰协调请求可以包含指示由所 述干扰协调请求所来自的基站评估的各个物理资源块的干扰状态的 信息。 功率调整单元可以在信息指示处于中等干扰状态的物理资源 块的情况下， 降低所指示的物理资源块的发射功率。
[08] 本发明的一个实施例是一种基于正交频分复用方案的基站中的 干扰协调方法。 根据该方法， 可以根据来自用户设备的反馈信息评 估各个物理资源块的干扰状态， 其中在物理资源块的干扰大于等于 第一阈值并且小于等于比第一阈值高的第二阈值的情况下， 把该物 理资源块的干扰评估为中等干扰状态。 此外， 可以至少响应于中等 干扰状态的评估， 向一个或多个预定基站传送干扰协调请求。 干扰 协调请求可以包含指示物理资源块的干扰状态的信息。
[09] 本发明的一个实施例是一种基于正交频分复用方案的基站中的 干扰协调方法。 根据该方法， 可以接收来自一个或多个预定基站的 干扰协调请求。 干扰协调请求可以包含指示由所述干扰协调请求所 来自的基站评估的各个物理资源块的干扰状态的信息。 此外， 可以 在信息指示处于中等干扰状态的物理资源块的情况下， 降低所指示 的物理资源块的发射功率。
附图说明
[10] 参照下面结合附图对本发明实施例的说明， 会更加容易地理解 本发明的以上和其它目的、 特点和优点。 在附图中， 相同的或对应 的技术特征或部件将采用相同或对应的附图标记来表示。
[11] 图 1示出了一种需要干扰协调的示例性场景。
[12] 图 2示出了另一种需要干扰协调的示例性场景。
[13] 图 3是示出根据本发明一个实施例的基于正交频分复用方案的 基站的示例性结构的框图。
[14] 图 4是示出根据本发明一个实施例的基于正交频分复用方案的 基站的示例性结构的框图。
[15] 图 5是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。
[16] 图 6是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。
[17] 图 7是示出根据本发明一个实施例的基于正交频分复用方案的 基站的示例性结构的框图。
[18] 图 8的示意图示出了基站以时分方式复用所指示的高干扰状态 的物理资源块的情形。
[19] 图 9是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。
[20] 图 10是示出用户设备的结构的示例的框图。
[21] 图 11 是示出其中实现本发明的设备和方法的计算机的示例性 结构的框图。
具体实施方式
[22] 下面参照附图来说明本发明的实施例。 应当注意， 为了清楚的 目的， 附图和说明中省略了与本发明无关的、 本领域普通技术人员 已知的部件和处理的表示和描述。
[23] 在 LTE-A系统中，各种小区可以灵活地部署在一起。这使得小 区间产生相互干扰。 [24] 图 1示出了一种需要干扰协调的示例性场景， 其中亳微微小区 对宏小区形成干扰。 如图 1所示， 宏基站 101伺服宏小区 102。 在 小区 102中， 亳微微基站 103伺服亳微微小区 104。 亳微微小区 104 对订阅的用户设备组群进行服务。宏小区 102对所有用户设备服务。 当宏小区 102服务的用户设备 105 亳微微小区 104时， 如果用 户设备 105从属于订阅亳微微小区 104的用户设备群， 它可以切换 到亳微微小区 104以接受亳微微基站 103的服务。 如果它不从属于 订阅亳微微小区 104的用户设备群， 它将受到亳微微小区 104的占 用相同传输资源的信道的强烈干扰。 具体地， 亳微微小区 104的下 行信 iM"宏小区 102的下行信道产生干扰。 因此， 需要对亳微微小 区 104和宏小区 102进行干扰协调。
[25] 图 2示出了另一种需要干扰协调的示例性场景， 其中宏小区对 微微小区形成干扰。 如图 2所示， 宏基站 201伺服宏小区 202。 在 小区 202中， 微微基站 203伺服微微小区 204。 微微小区 204为了 增加系统的容量采用了服务范围扩张（ Range Expansion )技术。 在 采用服务扩张技术的情况下， 订阅到微微小区 204并且位于其边缘 的用户设备 205会受到宏小区 202的较大干扰。具体地，宏小区 202 的下行信£^微微小区 204的下行信道产生干扰。 因此， 需要对宏 小区和微微小区进行干扰协调。
[26] 虽然前面的例子中说明了两个小区之间发生干扰的情形， 然而 所属领域普通技术人员能够明白， 也存在两个或更多个小区对同一 小区产生干扰的情形， 例如两个或更多个微微小区对同一宏小区产 生干扰、 宏小区和微微小区对同一亳微微小区产生干扰、 等等。
[27] 图 3是示出根据本发明一个实施例的基于正交频分复用方案的 基站 300的示例性结构的框图。
[28] 如图 3所示， 基站 300包括干扰评估单元 301和干扰协调请求 单元 302。
[29] 干扰评估单元 301根据来自用户设备， 例如用户设备 304， 的 反馈信息评估各个物理资源块的干扰状态。 可以采用各种已知的干 扰指标来衡量物理资源块的干扰。 用户设备可以反馈相应的反馈信 息以供估计干扰。 例如， 在通过诸如载干比、 信噪比的信号强度指 标来衡量干扰的情况下， 可以根据用户设备反馈的的参考信号接收 功率和参考信号发射功率来估计干扰。 再例如， 在通过信道质量来 衡量干扰的情况下， 可以根据用户设备反馈的信道质量信息来估计 干扰。
[30] 干扰评估单元 301可以根据物理资源块的干扰的大小来评估干 扰状态。 具体地， 可以设置第一阈值和高于第一阈值的第二阈值。 在物理资源块的干扰大于等于第一阈值并且小于等于比第一阈值高 的第二阈值的情况下， 干扰评估单元 301把物理资源块的干扰评估 为中等干扰状态。
[31] 干扰协调请求单元 302响应于中等干扰状态的评估， 向一个或 多个预定基站， 例如基站 303 , 传送干扰协调请求。 干扰协调请求 可以包含指示物理资源块的干扰状态， 即中等干扰状态的信息。 虽 然图 3 中只示出了一个产生干扰的基站 303， 然而根据具体无线通 信系统的小区配置， 可以存在多于一个的可能作为干扰源的基站。 对于每个基站， 可以根据小区配置设置一个或多个预定的基站， 作 为可能的干扰源。 当需要进行干扰协调时， 基站可以向这一个或多 个预定的基站发出干扰协调请求。
[32] 在进一步的实施例中， 干扰评估单元 301也可以评估出其它干 扰状态。 例如， 在物理资源块的干扰小于第一阈值的情况下， 干扰 评估单元 301可以把物理资源块的干扰评估为低干扰状态。再例如， 在物理资源块的干扰大于第二阈值的情况下， 干扰评估单元 301可 以把物理资源块的干扰评估为高干扰状态。 相应地， 干扰协调请求 还可以包含指示物理资源块处于低干扰状态的信息、 或包含指示物 理资源块处于高干扰状态的信息， 或两者均包含。
[33] 干扰协调请求单元 302可以定期或响应于收到用户设备的反馈 来进行评估。 干扰协调请求单元 302也可以定期、 响应于高干扰状 态的评估来传送干扰协调请求。 在定期的情况下， 干扰协调请求的 传送周期由基站间的物理传输媒质和系统时延决定。例如在采用 X2 接口传送干扰协调请求的情况下， 更新时间大于 20亳秒。
[34] 接收到干扰协调请求的基站在没有发现需要干扰协调的情形， 例如所有物理资源块处于低干扰状态时，可以不进行干扰协调处理。 [35] 可以看出， 图 3示出了一种无线通信系统， 包括至少一个用户 设备， 例如用户设备 304， 和至少一个基站， 例如基站 300。
[36] 进一步地， 无线通信系统中的用户设备可以包括被配置为发送 有关干扰的信息的发送器。 用户设备可以通过测量下行信道来获得 有关干扰的信息，从而通 it l送器反馈到基站。 图 10示出了用户设 备的结构的示例。 如图 10所示， 用户设备 1000包括用于发送有关 干扰的信息的发送器 1001。
[37] 图 4是示出根据本发明一个实施例的基于正交频分复用方案的 基站 400的示例性结构的框图。
[38] 如图 4所示， 基站 400包括接收单元 401和功率调整单元 402。
[39] 接收单元 401接收来自一个或多个预定基站， 例如基站 300的 干扰协调请求。 如参照图 3所述， 干扰协调请求可以包含指示由干 扰协调请求所来自的基站， 例如基站 300评估的各个物理资源块的 干扰状态的信息。
[40] 功率调整单元 402在信息指示处于中等干扰状态的物理资源块 的情况下， 降低所指示的物理资源块的发射功率。
[41] 例如， 基站 300和 400分别通 it ^同物理资源块对各自服务的 用户设备 304和 404进行下行传输。 在基站 300检测到物理资源块 的干扰处于中等干扰状态的情况下， 向基站 400传送包含指示物理 资源块处于中等干扰状态的信息的干扰协调请求。 基站 400接收干 扰协调请求并相应降低干扰协调请求所指示的物理资源块的发射功 率。于是可以降低对从基站 300到用户设备 304的下行传输的干扰， 并且不对从基站 400到用户设备 404的下行传输的质量产生大的影 响。 这样， 可以避免例如重新调度物理资源块的复杂操作。
[42] 在无线通信系统的具体实现中， 基站 300可以是被干扰小区的 基站， 基站 400可以是干扰小区的基站。 例如， 在图 1所示的场景 中， 基站 300可以是宏小区 102的基站 101， 基站 400可以是亳微 微小区 104的基站 103。 例如， 在图 2所示的场景中， 基站 300可 以是微微小区 204的基站 203, 基站 400可以是宏小区 202的基站 201。 当然， 也可以将基站配置为包含基站 300和 400的组成。 [43] 虽然图 4中只示出了一个发出干扰协调请求的基站 303， 然而 根据具体无线通信系统的小区配置， 可以存在多于一个的可能受基 站 400干扰的小区的基站。 对于每个基站， 可以根据小区配置设置 一个或多个预定的基站， 作为可能的被干扰小区的基站。 基站可以 从这一个或多个预定的基站接收干扰协调请求。
[44] 图 5是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。
[45] 如图 5所示， 方法从步骤 500开始。 在步骤 502， 才艮据来自用 户设备的反馈信息评估各个物理资源块的干扰状态， 其中在物理资 源块的干扰大于等于第一阈值并且小于等于比第一阈值高的第二阈 值的情况下， 把该物理资源块的干扰评估为中等干扰状态。
[46] 在步骤 504， 确定是否评估出处于中等干扰状态的物理资源块。 如果没有， 则方法在步骤 508结束。 如果评估出处于中等干扰状态 的物理资源块， 则前进到步骤 506。
[47] 在步骤 506， 响应于中等干扰状态的评估， 向一个或多个预定 基站传送干扰协调请求。 干扰协调请求包含指示所述物理资源块的 干扰状态的信息。 接着方法在步骤 508结束。 根据具体无线通信系 统的小区配置， 可以存在一个或多个的可能作为干扰源的基站。 对 于每个基站， 可以根据小区配置设置一个或多个预定的基站， 作为 可能的干扰源。 当需要进行干扰协调时， 基站可以向这一个或多个 预定的基站发出干扰协调请求。
[48] 此外或可选地， 在步骤 510， 用户设备可以发送有关干扰的信 息。 用户设备可以通过测量下行信道来获得有关干扰的信息， 从而 反馈到基站。
[49] 图 6是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。
[50] 如图 6所示， 方法从步骤 600开始。 在步骤 602， 接收来自一 个或多个预定基站的干扰协调请求。 干扰协调请求包含指示由干扰 协调请求所来自的基站评估的各个物理资源块的干扰状态的信息。
[51] 在步骤 604， 确定干扰协调请求是否包含指示处于中等干扰状 态的物理资源块的信息。 如果不包含， 则方法在步骤 608结束。 如 果包含， 则前进到步骤 606。
[52] 在步骤 606， 降低所指示的物理资源块的发射功率。 接着方法 在步骤 608结束。
[53] 在进一步的实施例中， 也可以评估出其它干扰状态。 例如， 在 物理资源块的干扰小于第一阈值的情况下， 可以把物理资源块的干 扰评估为低干扰状态。 再例如， 在物理资源块的干扰大于第二阈值 的情况下， 可以把物理资源块的干扰评估为高干扰状态。 相应地， 干扰协调请求还可以包含指示物理资源块处于低干扰状态的信息、 或包含指示物理资源块处于高干扰状态的信息， 或两者均包含。
[54] 可以定期或响应于收到用户设备的反馈来进行评估。 也可以定 期、 响应于高干扰状态的评估来传送干扰协调请求。 在定期的情况 决定。 例如在采用 X2接;传送^ 协調请求的情况下， 更 ^时间 大于 20亳秒。
[55] 对于所接收的干扰协调请求，在没有发现需要干扰协调的情形， 例如所有物理资源块处于低干扰状态时，可以不进行干扰协调处理。
[56] 图 7是示出根据本发明一个实施例的基于正交频分复用方案的 基站 700的示例性结构的框图。
[57] 如图 7所示， 基站 700包括接收单元 701、 功率调整单元 702 和资源调度单元 703。接收单元 701、功率调整单元 702分别与参照 图 4说明的接收单元 401、 功率调整单元 402功能相同， 因此这里 省略其详细说明。
[58] 资源调度单元 703在干扰协调请求包含的信息指示处于高干扰 状态的物理资源块的情况下， 进行调度以使基站 700和相应干扰协 调请求所来自的基站， 例如基站 300以时分方式复用所指示的高干 扰状态的物理资源块。 具体地， 时域上的子帧被映射到所指示的高 干扰状态的物理资源块。 可以将时域上的不同子帧分配给发出干扰 协调请求的基站 (例如基站 300)和接收干扰协调请求的基站 (例如基 站 700)。 可以有不同的分配子帧的方式。 例如， 可以将奇 /偶子帧分 配给一方基站， 将偶 /奇子帧分配给另一方基站。 也可以将子帧序列 划分为周期。 在每个周期中， 根据预定分配比例和分配模式来分配 子帧。 分配比例是指周期中分配给一方基站的子帧的数量与分配给 另一方基站的子帧的数量的比。 分配比例可以是固定的， 也可以在 系统初始化配置时， 由核心网中负责设置异构网络中小区 （例如宏 小区、 微微小区、 亳微微小区） 的配置信息的实体设置。 在具体实 现中， 分配比例可以根据需要来指定， 例如 1: 1、 1:2 1:9、
2:3、 等等。 分配模式是指按照预定分配比例把周期中的哪些子帧分 配给一方基站， 把周期中的哪些子帧分配给另一方基站。
[59] 图 8的示意图示出了基站 700和基站 300以时分方式复用所指 示的高干扰状态的物理资源块的示例性情形。
[60] 在图 8所示的情形中，干扰协调请求包含的信息指示子帧 2、 5、 6所映射到的物理资源块处于高干扰状态。 资源调度单元 703把偶 子帧分配给基站 300， 把奇子帧分配给基站 700。 资源调度单元 703 可以把分配信息通知给实施资源调度的部分 (未示出）， 使得在基站 700与用户设备 404之间的下行通信不使用未给其分配的子帧。 此 外， 资源调度单元 703还通知基站 300中实施资源调度的部分 (未示 出），使得在基站 300与用户设备 304之间的下行通信不使用未给其 分配的子帧。
[61] 通常情况下， 用户设备的干扰状态变化是緩慢的。 通过采用时 分复用方式， 可以在更宽的带宽上调度资源， 可获得较大的频率调 度增益。
[62] 虽然在结合图 7和图 8描述的例子中由两个基站以时分方式复 用所指示的高干扰状态的物理资源块， 然而如果基站从多于一个的 预定基站接收到干扰协调指示并且这些干扰协调指示包含的信息均 指示相同物理资源块处于高干扰状态， 那么资源调度单元 703也可 以进行调度， 使得在基站 400和这些预定基站之间以时分方式复用 所指示的高干扰状态的物理资源块。 相应地， 所基于的分配模式和 分配比例也涉及两个以上的基站。
[63] 图 9是示出根据本发明一个实施例的基于正交频分复用方案的 基站中的干扰协调方法的流程图。 [64] 如图 9所示， 方法从步骤 900开始。 在步骤 902， 接收来自一 个或多个预定基站的干扰协调请求。 干扰协调请求包含指示由干扰 协调请求所来自的基站评估的各个物理资源块的干扰状态的信息。
[65] 在步骤 904， 确定干扰协调请求是否包含指示处于中等干扰状 态的物理资源块的信息。 如果不包含， 则前进到步骤 908结束。 如 果包含， 则前进到步骤 906。
[66] 在步骤 906， 降低所指示的物理资源块的发射功率。 接着方法 前进到步骤 908结束。
[67] 在步骤 908， 确定干扰协调请求是否包含指示处于高干扰状态 的物理资源块的信息。 如果不包含， 则方法在步骤 912结束。 如果 包含， 则前进到步骤 910。
[68] 在步骤 910， 进行调度以使接收干扰调度请求的基站和相应干 扰协调请求所来自的基站以时分方式复用所指示的高干扰状态的物 理资源块。 具体地， 时域上的子帧被映射到所指示的高干扰状态的 物理资源块。 可以将时域上的不同子帧分配给发出干扰协调请求的 基站和接收干扰协调请求的基站。 可以有不同的分配子帧的方式。 例如，可以将奇 /偶子帧分配给一方基站，将偶 /奇子帧分配给另一方 基站。 也可以将子帧序列划分为周期。 在每个周期中， 根据预定分 配比例和分配模式来分配子帧。 分配比例是指周期中分配给一方基 站的子帧的数量与分配给另一方基站的子帧的数量的比。 在具体实 现中， 分配比例可以根据需要来指定， 例如 1: 1、 1:2 1:9、
2:3、 等等。 分配模式是指按照预定分配比例把周期中的哪些子帧分 配给一方基站， 把周期中的哪些子帧分配给另一方基站。 接着方法 在步骤 912结束。
[69] 虽然步骤 904的判定在步骤 908的判定之前进行，然而步骤 904 的判定在步骤 908的判定之后进行。
[70] 虽然在结合图 9描述的例子中由两个基站以时分方式复用所指 示的高干扰状态的物理资源块， 然而如果基站从多于一个的预定基 站接收到干扰协调指示并且这些干扰协调指示包含的信息均指示相 同物理资源块处于高干扰状态， 那么也可以进行调度， 使得在接收 干扰协调请求的基站和这些预定基站之间以时分方式复用所指示的 高干扰状态的物理资源块。 相应地， 所基于的分配模式和分配比例 也涉及两个以上的基站。
[71] 在上述基站和方法的实施例中， 可以按照预定调整量 (步长)， 调整前功率与调整后功率的差值来降低发射功率。 例如步长可以是 應、 3dB。
[72] 在上述基站和方法的一个进一步的实施例中， 干扰协调请求还 可以包含与处于中等干扰状态的物理资源块相关的调节信息。 调节 信息指示相关功率调整量。 功率调整量可以定义步长。 功率调整量 也可以定义调整比例， 例如调整后功率与调整前功率的比值。 调整 比例可以是固定比例， 例如 1/2、 1/3等等。
[73] 在一个具体实现中，功率调整量可以是固定长度 (n比特)的比特 串。 不同取值的比特串对应于不同的调整比例。 表 1示出了比特串 取值与调整比例的对应关系的示例。
表丄 比特串与调整比例的对应关系
Figure imgf000013_0001
[74] 发出干扰协调请求的基站可以根据当前干扰的强度来决定功率 调整量。 如果干扰强度较大， 可以采用能够快速降低发射功率的功 率调整量。 如果干扰强度不大， 可以采用能够緩慢降低发射功率的 功率调整量。
[75] 可以通过各种通信手段在基站之间传送干扰协调请求。 例如， 可以通过有线 (例如电缆、 光缆等等)或无线 (例如微波、 卫星等等)的 通信方式进行传送。 例如， 可以通过专用链路或网络来进行传送。 在一个示例性实现中， 可以通过诸如 X2、 Sl、 空口等接口来进行传 送。
[76] 干扰协調请求的格式可以符合具体使用的协议的要求。 在一个 具体实现中， 干扰协调请求可以包含与物理资源块相关的相对窄带 传输能量 (RNTP)值，其中当 RNTP值为特定值时，表示相关物理资 源块的干扰处于中等干扰状态。 在允许指示高干扰状态、 中等干扰 状态和低干扰状态的情况下， 可以通过两个或四个比特来表示 RNTP值。 例如， RNTP值等于 2、 1和 0分别指示高干扰状态、 中 等干扰状态和低干扰状态。
[77] 虽然前面结合 LTE-A 系统中异构网络中的小区间干扰来说明 本发明的实施例， 然而本发明的实施例也适用于诸如微波接入全球 互通 (WiM AX)等的无线通信系统。
[78] 本发明的实施例能够兼容 LTE-A Rel.8/9用户设备，对物理层空 中接口仅有较小影响。 本发明的实施例通过功率调整的方法获取较 好的干扰协调效果， 其中通过对中等干扰用户采用功率控制的方法 来进一步增大资源重用效率， 提高系统频傳效率。 本发明的干扰协 调方案适合作为 LTE-A数据信道的 elCIC方案。
[79] 所属技术领域的技术人员知道， 本发明可以体现为系统、 方法 或计算机程序产品。 因此， 本发明可以具体实现为以下形式， 即， 可以是完全的硬件、完全的软件（包括固件、驻留软件、微代码等）、 或者本文一般称为 "电路"、 "模块 "或"系统"的软件部分与硬件部分 的组合。 此外， 本发明还可以采取体现在任何有形的表达介质 ( medium of expression )中的计算机程序产品的形式， 该介质中包 含计算机可用的程序码。
[80] 可以使用一个或多个计算机可读介质的任何组合。 计算机可读 介质可以是计算机可读信号介质或计算机可读存储介质， 计算机可 读存储介盾例如可以是- -但不限于 电的、 磁的、 光的、 电磁的、 红 外线的、 或半导体的系统、 装置、 器件或传播介质、 或前述各项的 任何适当的组合。 计算机可读存储介盾的更具体的例子（非穷举的 列表）包括以下： 有一个或多个导线的电连接、便携式计算机磁盘、 硬盘、 随机存取存储器（ RAM )、 只读存储器 (ROM)、 可擦式可编 程只读存储器 (EPROM 或闪存)、 光纤、 便携式紧凑磁盘只读存储 器 (CD-ROM)、 光存储器件、 磁存储器件、 或前述各项的任何适当 的组合。 在本文语境中， 计算机可读存储介质可以是任何含有或存 储供指令执行系统、 装置或器件使用的或与指令执行系统、 装置或 器件相联系的程序的有形介质。
[81] 计算机可读信号介质可以包括例如在基带中或作为载波的一部 分传播的带有计算机可读程序代码的数据信号。 这样一种传播信号 可以采取任何适当的形式， 包括 --但不限于 电磁的、 光的或其任何 适当的组合。 计算机可读信号介盾可以是不同于计算机可读存储介 质的、 可以传达、 传播或传输供指令执行系统、 装置或器件使用的 或与指令执行系统、 装置或器件相联系的程序的任何一种计算机可 读介质。 包含在计算机可读介质中的程序代码可以采用任何适当的 介盾传输， 包括-但不限于-无线、 有线、 光缆、 射频等等、 或上 述各项的任何适当的组合。
[82] 用于执行本发明的操作的计算机程序码， 可以以一种或多种程 序设计语言的任何组合来编写， 所述程序设计语言包括面向对象的 程序设计语言一诸如 Java、 Smalltalk, C++之类， 还包括常规的过 程式程序设计语言一诸如" C"程序设计语言或类似的程序设计语 言。 程序码可以完全地在用户的计算上执行、 部分地在用户的计算 机上执行、 作为一个独立的软件包执行、 部分在用户的计算机上部 分在远程计算机上执行、 或者完全在远程计算机或服务器上执行。 在后一种情形中，远程计算机可以通过任何种类的网络- -包括局域网 (LAN)或广域网 (WAN)--连接到用户的计算机， 或者， 可以（例如利 用因特网服务提供商来通过因特网）连接到外部计算机。
[83] 图 11 是示出其中实现本发明的设备和方法的计算机的示例性 结构的框图。
[84] 在图 11 中， 中央处理单元（CPU)llOl 根据只读映射数据 (ROM)1102中存储的程序或从存储部分 1108加载到随积 取映射 数据 (RAM)1103的程序执行各种处理。 在 RAM 1103中， 也根据需 要存储当 CPU 1101执行各种处理等等时所需的数据。 [85] CPU 1101、 ROM 1102和 RAM 1103经由总线 1104彼此连接。 输入 /输出接口 1105也连接到总线 1104。
[86] 下述部件连接到输入 /输出接口 1105: 输入部分 1106， 包括键 盘、鼠标等等；输出部分 1107，包括显示器，比如阴极射线管 (CRT)、 液晶显示器 (LCD)等等， 和扬声器等等； 存储部分 1108， 包括硬盘 等等； 和通信部分 1109， 包括网络接口卡比如 LAN卡、 调制解调 器等等。 通信部分 1109经由网络比如因特网执行通信处理。
[87] 根据需要， 驱动器 1110也连接到输入 /输出接口 1105。 可拆卸 介质 1111比如磁盘、 光盘、 磁光盘、 半导体映射数据等等根据需要 被安装在驱动器 1110上，使得从中读出的计算机程序根据需要被安 装到存储部分 1108中。
[88] 在通过软件实现上述步骤和处理的情况下， 从网络比如因特网 或存储介质比如可拆卸介质 1111安装构成软件的程序。
[89] 本领域的技术人员应当理解，这种存储介质不局限于图 11所示 的其中存储有程序、 与方法相分离地分发以向用户提供程序的可拆 卸介质 1111。 可拆卸介质 1111 的例子包含磁盘、 光盘 (包含光盘只 读映射数据 (CD-ROM)和数字通用盘 (DVD))、 磁光盘 (包含迷你盘 (MD)和半导体映射数据。 或者， 存储介质可以是 ROM 1102、 存储 部分 1108中包含的硬盘等等， 其中存有程序， 并且与包含它们的方 法一起被分发给用户。
[90] 以下的权利要求中的对应结构、 材料、 操作以及所有功能性限 定的装置 (means)或步骤的等同替换， 旨在包括任何用于与在权利要 求中具体指出的其它单元相组合地执行该功能的结构、材料或操作。 所给出的对本发明的描述其目的在于示意和描述，并非是穷尽性的， 也并非是要把本发明限定到所表述的形式。 对于所属技术领域的普 通技术人员来说， 在不偏离本发明范围和精神的情况下， 显然可以 作出许多修改和变型。 对实施例的选择和说明， 是为了最好地解释 本发明的原理和实际应用， 使所属技术领域的普通技术人员能够明 了， 本发明可以有适合所要的特定用途的具有各种改变的各种实施 方式。

Claims

权利 要求 书
1. 一种基于正交频分复用方案的基站， 包括：
干扰评估单元， 根据来自用户设备的反馈信息评估各个物理资 源块的干扰状态， 其中在物理资源块的干扰大于等于第一阈值并且 小于等于比第一阈值高的第二阈值的情况下， 把该物理资源块的干 扰评估为中等干扰状态； 和
干扰协调请求单元， 至少响应于中等干扰状态的评估， 向一个 或多个预定基站传送干扰协调请求， 所述干扰协调请求包含指示所 述物理资源块的干扰状态的信息。
2. 如权利要求 1所述的基站， 其中， 所述干扰协调请求还包含 与处于中等干扰状态的物理资源块相关的调节信息， 所述调节信息 指示相关功率调整量， 所述相关功率调整量为调整后功率与调整前 功率的比值， 或调整前功率与调整后功率的差值。
3. 如权利要求 1或 2所述的基站， 其中， 指示所述物理资源块 的干扰状态的信息包括相对窄带传输能量值， 并且相对窄带传输能 量值等于 2、 1和 0分别指示高干扰状态、 中等干扰状态和低干扰状 态 o
4.一种基于正交频分复用方案的基站， 包括：
接收单元， 接收来自一个或多个预定基站的干扰协调请求， 所 述干扰协调请求包含指示由所述干扰协调请求所来自的基站评估的 各个物理资源块的干扰状态的信息； 和
功率调整单元， 在所述信息指示处于中等干扰状态的物理资源 块的情况下， 降低所指示的物理资源块的发射功率。
5.如权利要求 4所述的基站， 其中， 所述干扰协调请求还包含 与处于中等干扰状态的物理资源块相关的调节信息， 所述调节信息 指示相关功率调整量， 所述相关功率调整量为调整后功率与调整前 功率的比值， 或调整前功率与调整后功率的差值， 并且 所述功率调整单元进一步被配置为按照相关功率调整量来降低 物理资源块的发射功率。
6.如权利要求 4或 5所述的基站， 其中， 指示所述物理资源块 的干扰状态的信息包括相对窄带传输能量值， 并且相对窄带传输能 量值等于 2、 1和 0分别指示高干扰状态、 中等干扰状态和低干扰状 态 o
7.如权利要求 4或 5所述的基站， 还包括：
资源调度单元， 在所述信息指示处于高干扰状态的物理资源块 的情况下， 进行调度以使所述基站和相应干扰协调请求所来自的基 站以时分方式复用所指示的物理资源块。
8.如权利要求 7所述的基站， 其中， 所述资源调度单元进一步 被配置为按照在系统初始化配置时设置的分配比例来分配映射到所 指示的物理资源块的子帧， 所述分配比例是分配给所述基站的所述 子帧的数量与分配给相应干扰协调请求所来自的基站的所述子帧的 数量的比。
9. 一种无线通信系统， 包括至少一个用户设备和至少一个如权 利要求 1至 8之一所述的基站。
10. 如权利要求 9所述的无线通信系统， 其中所述至少一个用 户设备包括被配置为发送有关所述干扰的信息的发送器。
11.一种基于正交频分复用方案的基站中的干扰协调方法， 包 括 ··
根据来自用户设备的反馈信息评估各个物理资源块的干扰状 态， 其中在物理资源块的干扰大于等于第一阈值并且小于等于比第 一阈值高的第二阈值的情况下， 把该物理资源块的干扰评估为中等 干扰状态； 和
至少响应于中等干扰状态的评估， 向一个或多个预定基站传送 干扰协调请求， 所述干扰协调请求包含指示所述物理资源块的干扰 状态的信息。
12. 如权利要求 11所述的干扰协调方法， 其中， 所述干扰协调 请求还包含与处于中等干扰状态的物理资源块相关的调节信息， 所 述调节信息指示相关功率调整量， 所^目关功率调整量为调整后功 率与调整前功率的比值， 或调整前功率与调整后功率的差值。
13. 如权利要求 11或 12所述的干扰协调方法， 其中， 指示所 述物理资源块的干扰状态的信息包括相对窄带传输能量值， 并且相 对窄带传输能量值等于 2、 1和 0分别指示高干扰状态、 中等干扰状 态和低干扰状态。
14. 如权利要求 11或 12所述的干扰协调方法， 还包括由用户 设备发送有关所述干扰的信息。
15. 一种基于正交频分复用方案的基站中的干扰协调方法， 包 括 ··
接收来自一个或多个预定基站的干扰协调请求， 所述干扰协调 请求包含指示由所述干扰协调请求所来自的基站评估的各个物理资 源块的干扰状态的信息； 和
在所述信息指示处于中等干扰状态的物理资源块的情况下， 降 低所指示的物理资源块的发射功率。
16. 如权利要求 15所述的干扰协调方法， 其中， 所述干扰协调 请求还包含与处于中等干扰状态的物理资源块相关的调节信息， 所 述调节信息指示相关功率调整量， 所 目关功率调整量为调整后功 率与调整前功率的比值， 或调整前功率与调整后功率的差值， 并且 所述降低包括按照相关功率调整量来降低物理资源块的发射功 率。
17. 如权利要求 15或 16所述的干扰协调方法， 其中， 指示所 述物理资源块的干扰状态的信息包括相对窄带传输能量值， 并且相 对窄带传输能量值等于 2、 1和 0分别指示高干扰状态、 中等干扰状 态和低干扰状态。
18. 如权利要求 15或 16所述的干扰协蜩方法， 还包括： 在所述信息指示处于高干扰状态的物理资源块的情况下， 进行 调度以使所述基站和相应干扰协调请求所来自的基站以时分方式复 用所指示的物理资源块。
19. 如权利要求 18所述的干扰协调方法， 其中， 所述调度包括 按照在系统初始化配置时设置的分配比例来分配映射到所指示的物 理资源块的子帧， 所述分配比例是分配给所述基站的所述子帧的数 量与分配给相应干扰协调请求所来自的基站的所述子帧的数量的 比。
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