CN111355511A - Inter-base station interference coordination apparatus, method, and non-volatile computer readable medium - Google Patents
Inter-base station interference coordination apparatus, method, and non-volatile computer readable medium Download PDFInfo
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- CN111355511A CN111355511A CN201910111349.5A CN201910111349A CN111355511A CN 111355511 A CN111355511 A CN 111355511A CN 201910111349 A CN201910111349 A CN 201910111349A CN 111355511 A CN111355511 A CN 111355511A
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses an interference coordination device between base stations. The inter-base station interference coordination device comprises a processor and a transceiver device. The processor runs the first base station virtual machine and the second base station virtual machine to emulate the victim base station and the disturber base station, respectively. The processor controls the transceiver to establish a connection between each of the at least one large base station and the first base station virtual machine via the first interface, and to establish a connection between each of the at least one large base station and the second base station virtual machine via the second interface. The processor operates the interference coordinator to receive a first almost blank subframe pattern provided by at least one macro base station from the first base station virtual machine, thereby mitigating interference of each of the macro base stations with at least one pico base station and interference of each of the at least one femto base station with at least one macro base station.
Description
Technical Field
The invention relates to an inter-base station interference coordination apparatus, method, and non-volatile computer readable medium.
Background
In the Heterogeneous network (Heterogeneous network) environment, in order to avoid interference between neighboring base stations, 3GPP proposes an Enhanced Inter Cell interference coordination (eICIC) frame, in which an Almost Blank Subframe (ABS) mechanism is a way to mitigate interference between the base stations, in the ABS mechanism, there are two roles of an interferer base station (interferer Cell) and an interferer base station (victim Cell), the interferer base station may choose not to transmit data or reduce power in some subframes, so that the interferer base station may use these subframes to provide service to the interfered user, for example, when a user of a pico base station (pico Cell) is interfered by a macro base station (macro Cell), the macro base station may inform the macro base station that the macro base station uses the several subframes to provide interference to the interfered user or the base station, when a user of the macro base station is interfered by a femto base station (femto cell), the femto base station may inform the macro base station that the macro base station can provide services to the user interfered by the femto base station using those few subframes by transmitting an ABS pattern.
In addition, with the development of Ultra-high-density network (UDN) technology, the density of base stations is also increasing. Therefore, a centralized coordination mechanism is proposed for performing ABS pattern allocation according to the current overall network condition. In the centralized coordination mechanism, a gateway (gate way) may be configured to perform ABS pattern allocation to coordinate interference between base stations.
However, in the current centralized coordination scheme, a single coordination device can only allocate ABS patterns to a single role of the macro bs as an interfering bs or a single role of the macro bs as an interfered bs. That is, when the large-scale base station has the roles of the interfering base station and the interfered base station, how to coordinate the allocation of ABS patterns to the two different roles of the large-scale base station is realized in a single coordination apparatus is one of the research challenges.
Disclosure of Invention
The present invention relates to inter-base station interference coordination, and more particularly, to an inter-base station interference coordination apparatus, method and non-volatile computer readable medium.
An embodiment according to the present invention provides an inter-base station interference coordination apparatus. The inter-base station interference coordination device comprises a processor and a transceiver device. The processor runs the first base station virtual machine to emulate the victim base station and runs the second base station virtual machine to emulate the aggressor base station. The transceiver is coupled to the processor. The processor controls the transceiver to establish a connection between the at least one large base station and the first base station virtual machine through the first interface, and to establish a connection between the at least one large base station and the second base station virtual machine through the second interface, so as to transmit and receive data. In addition, the processor operates the interference coordinator to receive a first almost blank subframe pattern provided by each of the at least one macro base station from the first base station virtual machine, so as to reduce interference of the at least one macro base station to each of the at least one pico base station and the at least one femto base station.
According to an embodiment of the invention, a method for coordinating interference between base stations is provided. The method for coordinating interference between base stations is suitable for a device for coordinating interference between base stations. The method for coordinating interference between base stations comprises establishing connection between at least one large base station and a first base station virtual machine of an interference coordination device between the base stations through a first interface respectively so as to transmit and receive data, wherein the first base station virtual machine is used for simulating a base station of an interfered person; establishing a connection between at least one large base station and a second base station virtual machine of the inter-base station interference coordination device through a second interface respectively so as to transmit and receive data, wherein the second base station virtual machine is used for simulating an interferer base station; and receiving, by the interference coordinator, the first almost blank subframe pattern provided by the at least one macro base station from the first base station virtual machine, so as to mitigate interference of the at least one macro base station with the at least one pico base station, and thereby mitigate interference of the at least one femto base station with the at least one macro base station.
According to an embodiment of the present invention, a non-transitory computer-readable medium is provided, storing a computer program product for performing the following steps: establishing a connection between at least one large base station and a first base station virtual machine of an interference coordination device between base stations through a first interface respectively so as to transmit and receive data, wherein the first base station virtual machine is used for simulating a base station of an interfered person; establishing a connection between at least one large base station and a second base station virtual machine of the inter-base station interference coordination device through a second interface respectively so as to transmit and receive data, wherein the second base station virtual machine is used for simulating an interferer base station; and receiving, by the interference coordinator, the first almost blank subframe pattern provided by the at least one macro base station from the first base station virtual machine, so as to mitigate interference of the at least one macro base station with the at least one pico base station, and thereby mitigate interference of the at least one femto base station with the at least one macro base station.
Drawings
Fig. 1 shows a block diagram of an interference coordination device 100 according to an embodiment of the invention;
fig. 2 shows a flowchart 200 of a first base station vm and a second base station vm establishing a connection with a large base station according to an embodiment of the invention;
fig. 3 is a flowchart illustrating an interference coordination device 100 allocating an almost blank subframe pattern according to an embodiment of the invention;
FIGS. 4A-4C are schematic diagrams illustrating an almost blank subframe pattern according to an embodiment of the invention;
FIGS. 5A-5C are schematic diagrams illustrating an almost blank subframe pattern according to another embodiment of the invention;
fig. 6 is a flowchart 600 of a method for coordinating interference between base stations according to an embodiment of the invention.
Description of the symbols:
100. 420 interference coordination device
110 processor
120 transceiver
130 storage device
140. 420-1 first base station virtual machine
150. 420-2 interference coordinator
160. 420-3 second base station virtual machine
200. 310, 410, 510A, 510B large base station
320. 430A, 430B, 430C, 530A, 530B, 530C, 530D pico base station
330. 440, 540A, 540B, 540C femtocell
Steps S210 to S240, S310 to S380, and S610 to S630
U1, U2, U3, U4, U5, U6, U7, U8, U9, U10 user
X2, TR-069 interface
Detailed Description
The present section describes some modes of carrying out the invention for the purpose of illustrating practical examples and not for the purpose of limiting the scope of the invention, which is defined in the appended claims.
Fig. 1 shows a block diagram of an interference coordination device 100 according to an embodiment of the invention. According to an embodiment of the present invention, the interference coordination device 100 may be a gateway (gateway) or a server, but the invention is not limited thereto. As shown in fig. 1, the interference coordination device 100 may include a processor 110, a transceiver 120, and a storage device 130. The processor 110 is coupled to the transceiver 120 and the storage 130. Note that the schematic diagram in fig. 1 is only for convenience of describing the embodiment of the present invention, but the present invention is not limited thereto.
According to an embodiment of the invention, the processor 110 is configured to execute the data stored in the storage device 130, operate a first base station virtual machine 140 (shown in fig. 3) to simulate an interfered (Victim) base station, and operate a second base station virtual machine 160 (shown in fig. 3) to simulate an interfered (Aggressor) base station. The processor 110 is also configured to execute the data stored in the storage device 130 to operate an interference coordinator 150 (shown in fig. 3) to coordinate the allocation of Almost Blank Subframes (ABS) among the base stations to reduce interference.
According to an embodiment of the invention, the transceiver 120 may be a network card or a network chip, but the invention is not limited thereto. The processor 110 may control the transceiver 120 to establish a connection between at least one macro cell and the first bs vm 140 of the interference coordination apparatus 100 via a first interface, and to establish a connection between at least one macro cell and the second bs vm 160 of the interference coordination apparatus 100 via a second interface, respectively, to transmit and receive data. When the macro base station is connected to the first base station virtual machine 140, the macro base station can be regarded as an interfering base station, and when the macro base station is connected to the second base station virtual machine 160, the macro base station can be regarded as an interfered base station.
Fig. 2 is a flowchart illustrating a first base station vm and a second base station vm establishing a connection with a large base station according to an embodiment of the invention. As shown in fig. 2, when the first bs vm 140 of the interference coordination apparatus 100 wants to establish a connection with the macro bs 200, the transceiver 120 of the interference coordination apparatus 100 sends a first configuration request (setup request) to the macro bs 200 via the first interface (S210). The macro bs 200 returns a first Setup Response (Setup Response) to the interference coordination apparatus 100 via the first interface to establish a connection with the first bs vm 140 (S220). In this embodiment, the first configuration request includes a base station identification, and the base station identification may be a small base station identification (HeNB ID) or a large base station identification (eNB ID). The small cell id or the large cell id may be specific to the identity used by the interference coordination unit 100 or may be used by other cells in the network. The first set-up response includes the base station identification of the large base station 200. In addition, as shown in fig. 2, when the second bs vm 160 of the interference coordination apparatus 100 wants to establish a connection with the macro bs 200, the transceiver 120 of the interference coordination apparatus 100 sends a second Setup Request (Setup Request) to the macro bs 200 via the second interface (S230). The macro bs 200 returns a second Setup Response (Setup Response) to the interference coordination apparatus 100 via the second interface to establish a connection with the second bs vm 160 (S240). In this embodiment, the second setup request includes a base station identification (HeNB ID) and a Closed Subscriber Group identification (CSG ID) of a femto base station (femto cell) interfering with the macro base station 200, and the second setup response includes the base station identification of the macro base station 200. According to an embodiment of the present invention, the first interface and the second interface may be an X2 interface or an Xn interface, and each macro base station is connected to the first base station virtual machine 140 via a first interface and to the second base station virtual machine 160 via a second interface.
In addition, the processor 110 may control the transceiver 120 to establish a connection between each of at least one pico base station interfered by each of at least one macro base station and the first base station virtual machine 140 of the interference coordination apparatus 100 via a third interface to transmit and receive data. The transceiver device 120 sends a configuration request to the pico base station, where the configuration request includes a base station identification (HeNB ID) or a large base station identification (eNB ID). In addition, the processor 110 can control the transceiver 120 to establish a connection between at least one femtocell interfering with at least one macro bs via a fourth interface and the second bs virtual machine 160 of the interference coordination apparatus 100 to transmit and receive data. According to an embodiment of the present invention, the third interface may be an X2 interface or an Xn interface, and each pico base station is connected to the first base station virtual machine 140 via a third interface. According to an embodiment of the present invention, the fourth interface may be an X2 interface, an Xn interface, or an Operations and Management (OAM) interface (e.g., TR-069 interface), and each femtocell is connected to the second bs vm 160 through a fourth interface.
According to an embodiment of the present invention, the storage device 130 may be used for storing software and firmware program codes, system data, and the like. The storage device 130 can be any storage medium with storage function, such as: a volatile Memory (RAM), a non-volatile Memory (flash Memory), a Read Only Memory (ROM), a hard disk, or a combination thereof.
Fig. 3 is a flowchart illustrating the interference coordination apparatus 100 allocating an almost blank subframe pattern according to an embodiment of the invention. Referring to fig. 1 and fig. 3, fig. 3 is a flowchart illustrating an embodiment of allocating a substantially blank subframe pattern to a first bs vm 140, an interference coordinator 150, and a second bs vm 160 operated by a processor 110 of the interference coordination apparatus 100 shown in fig. 1. When the macro bs 310 transmits the first subframe pattern provided by the macro bs to the first bs vm 140 of the interference coordination apparatus 100 via the first interface (step S310), the first bs vm 140 transmits the first subframe pattern to the interference coordinator 150 (step S320). The interference coordinator 150 generates a near blank subframe pattern to be allocated to the pico base station 320 interfered by the macro base station 310 according to the first near blank subframe pattern, and transmits the near blank subframe pattern to be allocated to the pico base station 320 interfered by the macro base station 310 to the first base station vm 140 (step S330). The first bs vm 140 transmits a subframe pattern to be allocated to the pico bs 320 interfered by the macro bs 310, which corresponds to the almost blank subframe pattern, to the pico bs 320 via the third interface (step S340). In step S350, the interference coordinator 150 generates a second almost blank subframe pattern to be allocated to the femtocell 330 interfering with the femtocell 310 according to the first almost blank subframe pattern, so as to mitigate the femtocell 330 interference to the femtocell 310. In step S350, the interference coordinator 150 further generates an almost blank subframe pattern to be allocated to the macro base station 310 according to the second almost blank subframe pattern of the femto base station 330. The interference coordinator 150 transmits the second almost blank subframe pattern of the femto base station 330 to be allocated to the interference to the macro base station 310 and the almost blank subframe pattern to be allocated to the macro base station 310 to the second base station virtual machine 160 (S360). The second base station virtual machine 160 then transmits the second almost blank subframe pattern of the femtocell 330 to the femtocell 330 via the fourth interface (S370), and transmits the almost blank subframe pattern to be allocated to the femtocell 310 via the second interface (S380).
Specifically, fig. 3 shows a macro base station 310, a pico base station 320 and a femto base station 330, but the invention is not limited thereto. The process shown in fig. 3 is also applicable to the case of multiple macro bs, multiple pico bs, and multiple femto bs interference. Fig. 5A to 5C will be described below.
Fig. 4A-4C are schematic diagrams illustrating an almost blank subframe pattern according to an embodiment of the invention. Note that the schematic diagrams in fig. 4A-4C are only for convenience of describing the embodiments of the present invention, but the present invention is not limited thereto.
Referring to the scenario shown in FIG. 4A, users U1, U2, and U3 of pico base stations 430A-430C are interfered by the macro base station 410 (i.e., the macro base station 410 is an interferer), and user U5 of the macro base station 410 is interfered by the femto base station 440 (i.e., the macro base station 410 is an interferer). In addition, U4 is the user of femtocell 440.
As shown in fig. 4B. In one embodiment, when the users U1, U2, and U3 of the pico base stations 430A-430C are interfered by the macro base station 410, the pico base stations 430A-430C inform the interference coordination unit 420 via a third interface (e.g., the X2 interface) that they are interfered by the macro base station 410. When the macro base station 410 knows the micro base stations 430A-430C are interfered by the interference coordination device 420, the macro base station 410 generates a first almost blank subframe pattern (e.g., {1, 0}, wherein 1 of the first almost blank subframe pattern indicates a time point allocated to the micro base stations 430A-430C and 0 indicates a time point not allocated to the micro base stations 430A-430C), and transmits the first almost blank subframe pattern to the first base station virtual machine 420-1 of the interference coordination device 420 via a first interface (e.g., X2 interface). The first bs virtual machine 420-1 transmits the first almost blank subframe pattern provided by the macro bs 410 to the interference coordinator 420-2 of the interference coordination apparatus 420, and the interference coordinator 420-2 generates the almost blank subframe patterns to be allocated to the micro bss 430A-430C, respectively, according to the first almost blank subframe pattern. Finally, the first BS virtual machine 420-1 transmits via a third interface (e.g., the X2 interface) the respective almost blank subframe patterns to be allocated to the micro BSs 430A-430C. For example, if the first almost blank subframe pattern generated by the macro bs 410 is {1, 0}, it means that the almost blank subframe pattern to be allocated to the femto bss 430A-430C may be one of {1, 0}, {0, 1, 0}, {1, 0}, {0, 1, 0}, {1, 0}, {1, 0 }. Therefore, the interference coordinator 420-2 can determine the almost blank subframe patterns to be allocated to the pico base stations 430A-430C from the six patterns, wherein each pico base station can be allocated to the same or different almost blank subframe patterns. As shown in fig. 4B, the almost blank subframe patterns allocated to pico base stations 430A and 430C may be {1, 0}, and the almost blank subframe patterns allocated to pico base station 430B may be {0, 1, 0 }.
In yet another embodiment, as shown in fig. 4C, when the user of the macro base station 410 is interfered by the femto base station 440, in order to avoid the second almost blank subframe pattern of the femto base station 440 from colliding with the first almost blank subframe pattern generated by the macro base station 410, the interference coordinator 420-2 requests the first base station virtual machine 420-1 to provide the first almost blank subframe pattern generated by the macro base station 410, and performs a complementary set (complementary set) operation on the first almost blank subframe pattern provided by the macro base station 410 to determine the second almost blank subframe pattern to be allocated to the femto base station 440. For example, if the first almost blank subframe pattern generated by the macro base station 410 is {1, 0}, and after the complementary set operation, it becomes {0, 1}, which means that the second almost blank subframe pattern allocated to the femto base station 440 can be {0, 1, 0}, {0, 1}, and {0, 1}, wherein 1 of the second almost blank subframe pattern indicates a time point when the macro base station 410 can use, and 0 indicates a time point when the macro base station 410 cannot use. When the interference coordinator 420-2 determines a second almost blank subframe pattern (e.g., {0, 1, 0}) to be allocated to the femtocell 440, the second almost blank subframe pattern, and the almost blank subframe pattern allocated to the macro base station 410 according to the second almost blank subframe pattern of the femtocell 440, are transmitted to the second base station virtual machine 420-3. The second BS VM 420-3 then transmits the second almost blank subframe pattern of the femtocell 440 to the femtocell 440 via a fourth interface (e.g., X2 interface or TR-069 interface), and transmits the almost blank subframe pattern allocated to the macro BS 410 via a second interface (e.g., X2 interface).
Fig. 5A-5C are schematic diagrams illustrating an almost blank subframe pattern according to another embodiment of the invention. It is noted that the schematic diagrams in fig. 5A-5C are only for convenience of describing the embodiments of the present invention, but the present invention is not limited thereto.
Referring to the scenario of FIG. 5A, users U1 and U2 of pico base stations 530A and 530B are interfered by large base station 510A, user U5 of pico base station 530D is interfered by large base station 510B, and users U3 and U4 of pico base station 530C are interfered by large base station 510A and large base station 510B. In addition, user U7 of large base station 510A is interfered by femto base station 540A, user U10 of large base station 510B is interfered by femto base station 540C, and user U8 of large base station 510A and user U9 of large base station 510B are interfered by femto base station 540B. In addition, U6 is a subscriber of femtocell 540A.
In the scenario of fig. 5A, how the interference coordination device 520 allocates the almost blank subframe patterns to the pico base stations 530A, 530B and 530D and how the almost blank subframe patterns are allocated to the femto base stations 540A and 540C is similar to the operation of the interference coordination device 420, and therefore, the description thereof is omitted here. In this embodiment, it is mainly aimed at how the interference coordination unit 520 allocates an almost blank subframe pattern to the pico base station 530C which is interfered by both the large base station 510A and the large base station 510B, and the femto base station 540B which is interfered by both the large base station 510A and the large base station 510B.
As shown in FIG. 5B, when the macro base station 510A knows that the micro base stations 530A-530C are interfered from the interference coordination apparatus 520, the macro base station 510A generates a first almost blank subframe pattern (e.g., {1, 0}, wherein 1 in the first almost blank subframe pattern indicates a time point that the micro base stations 530A-530C can be allocated for use, and 0 indicates a time point that the micro base stations 530A-530C cannot be allocated for use), and when the macro base station 510B knows that the micro base stations 530C-530D are interfered from the interference coordination apparatus 520, the macro base station 510B generates another first almost blank subframe pattern (e.g., {1, 0, 1 }). The large base station 510A and the large base station 510B each transmit the generated first almost blank subframe pattern to the first base station virtual machine 520-1 of the interference coordination device 520 via a first interface (e.g., X2 interface). The first bs virtual machine 520-1 transmits the first almost blank subframe pattern provided by the large bs 510A and the large bs 510B to the interference coordinator 520-2 of the interference coordination apparatus 520.
In this embodiment, since the pico base station 530C is interfered by both the macro base station 510A and the macro base station 510B, the interference coordinator 520-2 may perform an intersection (intersection) operation on the first almost blank subframe patterns provided by the macro base station 510A and the macro base station 510B, and when there is an intersection, determine the almost blank subframe pattern to be allocated to the pico base station 530C according to the result of the intersection operation. The first bs virtual machine 520-1 then transmits the almost blank subframe pattern to be allocated to the femtocell 530C via a third interface (e.g., an X2 interface). For example, if the first almost blank subframe pattern generated by the macro base station 510A is {1, 0}, and the first almost blank subframe pattern generated by the macro base station 510B is {1, 0, 1}, the interference coordinator 520-2 generates the almost blank subframe pattern {1, 0}, after performing the intersection operation on the first almost blank subframe patterns provided by the macro base station 510A and the macro base station 510B, i.e., the almost blank subframe pattern to be allocated to the pico base station 530C may be one of {1, 0}, {0, 1, 0}, and {1, 0 }. Therefore, the interference coordinator 520-2 can determine the almost blank subframe pattern to be allocated to the femtocell 530C from the three patterns.
According to another embodiment of the present invention, when the first almost blank subframe patterns generated by the macro base station 510A and the macro base station 510B of the interfering pico base station 530C do not intersect, the interference coordinator 520-2 may determine to generate the almost blank subframe pattern allocated to the micro base station 530C according to the first almost blank subframe pattern provided by the macro base station 510A or the macro base station 510B according to the respective interference strengths of the macro base station 510A and the macro base station 510B of the interfering pico base station 530C. For example, if the interference level of the macro base station 510A is greater than the interference level of the macro base station 510B (i.e., the interference of the macro base station 510A to the pico base station 530C is greater than the interference of the macro base station 510B to the pico base station 530C), the interference coordinator 520 may generate an almost blank subframe pattern allocated to the micro base station 530C according to the first almost blank subframe pattern provided by the macro base station 510A.
As shown in fig. 5C, when the user of the macro base station 510A and the macro base station 510B is interfered by the femto base station 540B, in order to avoid the second almost blank subframe pattern allocated to the femto base station 540 from colliding with the first almost blank subframe pattern provided by each of the macro base station 510A and the macro base station 510B, the interference coordinator 520-2 may request the first base station virtual machine 520-1 to provide the first almost blank subframe pattern generated by each of the macro base station 510A and the macro base station 510B, and perform the operation of taking the joint set (unity set) and then the operation of taking the complementary set (complementary set) on the first almost blank subframe pattern provided by each of the macro base station 510A and the macro base station 510B to generate the second almost blank subframe pattern to be allocated to the femto base station 540.
For example, if the first almost blank subframe pattern generated by the macro bs 510A is {1, 0}, and the first almost blank subframe pattern generated by the macro bs 510B is {1, 0, 1}, the first almost blank subframe pattern becomes {1, 0, 1}, after the operation of the set-associative matching. {1, 0, 1} is complemented to be {0, 1, 0}, where 1 in the second almost blank subframe pattern indicates a time point when the macro bs 510A and the macro bs 510B can be used, and 0 indicates a time point when the macro bs 510A and the macro bs 510B cannot be used. For another example, if the first almost blank subframe pattern generated by the macro base station 510A is {1, 0}, and the first almost blank subframe pattern generated by the macro base station 510B is {1, 0, 1}, the first almost blank subframe pattern becomes {1, 0, 1}, after the operation of the set-associative operation. {1, 0, 1} is complemented to be {0, 1, 0}, i.e., the second almost blank subframe pattern assigned to femtocell 540B may be {0, 1, 0}, {0, 1, 0}, and {0, 1, 0 }. When the interference coordinator 520-2 determines a second almost blank subframe pattern (e.g., {0, 1, 0}) to be allocated to the femtocell 540 and generates almost blank subframe patterns to be allocated to the macro base station 510A and the macro base station 510B, respectively, according to the second almost blank subframe (the almost blank subframe patterns allocated to the macro base station 510A and the macro base station 510B may be the same or different), the interference coordinator 520-2 transmits the second almost blank subframe pattern and the almost blank subframe patterns to be allocated to the macro base station 510A and the macro base station 510B to the second BS virtual machine 520-3. The second BS VM 520-3 then transmits the second almost blank subframe pattern to the femtocell 540B via a fourth interface (e.g., an X2 interface or a TR-069 interface), and transmits the respective almost blank subframe patterns allocated to the macro BS 510A and the macro BS 510B via a second interface (e.g., an X2 interface).
Fig. 6 is a flowchart 600 of a method for coordinating interference between base stations according to an embodiment of the invention. The inter-base station interference coordination method is suitable for the interference coordination device 100. In step S610, the interference coordination apparatus 100 establishes a connection between at least one macro base station and a first base station virtual machine of the interference coordination apparatus 100 through a first interface, respectively, so as to transmit and receive data, wherein the first base station virtual machine is used to simulate an interfered base station. In step S620, the interference coordination apparatus 100 establishes a connection between at least one macro base station and a second base station virtual machine of the interference coordination apparatus 100 through a second interface, respectively, so as to transmit and receive data, wherein the second base station virtual machine is used to simulate an interferer base station. In step S630, the interference coordinator of the interference coordination apparatus 100 receives the first almost blank subframe pattern provided by each of the at least one macro base station from the first base station virtual machine, so as to mitigate the interference of the at least one macro base station to each interfered pico base station, and thereby mitigate the interference of the at least one femto base station to each interfered macro base station.
According to the embodiments of the present invention, in addition to reducing the interference of each large base station to each pico base station within the coverage area of each large base station, when each pico base station receives the interference of a plurality of large base stations, the interference received by each pico base station at the overlapping area of the coverage areas of the large base stations is also reduced.
In some embodiments, the inter-base station interference coordination method further includes the interference coordination apparatus 100 generating a second almost blank subframe pattern of each of the at least one femtocell according to the first almost blank subframe pattern provided by each of the at least one macro base station, so as to mitigate interference of the at least one femto base station with the respective interfered at least one macro base station.
In some embodiments, the method for inter-base station interference coordination further includes the interference coordination apparatus 100 establishing a connection between at least one pico base station and the first base station virtual machine via a third interface, respectively, to transmit and receive data. The interference coordination apparatus 100 generates, by the interference coordination apparatus, near-blank subframe patterns allocated to at least one pico-base station interfered by each of the at least one large-base station according to the received first near-blank subframe patterns provided by each of the at least one large-base station, and transmits, by the first base station virtual machine, the near-blank subframe patterns allocated to the interfered at least one pico-base station to each of the at least one pico-base station through the third interface.
In some embodiments, the inter-base station interference coordination method further includes, when one of the pico-base stations is interfered by multiple large-base stations, performing, by the interference coordination apparatus 100, an intersection operation on first almost blank subframe patterns provided by the multiple large-base stations interfering with the pico-base stations through the interference coordination apparatus, and when there is an intersection, generating, according to a result of the intersection operation, an almost blank subframe pattern allocated to the pico-base station interfered by the multiple large-base stations.
In some embodiments, the inter-base-station interference coordination method further includes, when the first almost blank subframe patterns provided by the multiple macro base stations of the interfering pico-base station do not intersect, the interference coordination apparatus 100 generating the almost blank subframe pattern allocated to the pico-base station interfered by the multiple macro base stations by the interference coordinator determining which of the multiple macro base stations of the interfering pico-base station provides the first almost blank subframe pattern according to respective interference strengths corresponding to the multiple macro base stations of the interfering pico-base station. In some embodiments, the interference coordination apparatus 100 generates the almost blank subframe pattern allocated to the pico base station interfered by the plurality of large base stations by the interference coordinator according to the first almost blank subframe pattern provided by the one of the plurality of large base stations corresponding to the strongest interference strength.
In some embodiments, the inter-base station interference coordination method further includes the interference coordination apparatus 100 generating, by the interference coordination apparatus, a second almost blank subframe pattern of each of the at least one femtocell according to the first almost blank subframe pattern provided by each macro base station, so as to mitigate interference experienced by each of the at least one macro base station and the at least one femtocell.
In some embodiments, the method for inter-base station interference coordination further includes the interference coordination apparatus 100 establishing a connection between at least one femtocell and the second base station virtual machine via a fourth interface, respectively, to transmit and receive data.
In some embodiments, the inter-base station interference coordination method further includes generating, by the interference coordination apparatus 100, respective almost blank subframe patterns allocated to the at least one macro base station interfered by each of the at least one femto base stations according to respective second almost blank subframe patterns of the at least one femto base station by the interference coordination apparatus. The interference coordination apparatus 100 transmits the second almost blank subframe pattern to the second bs vm through the interference coordination apparatus. The interference coordination apparatus 100 transmits the second almost blank subframe pattern of each of the at least one femtocell interfering with the macro bs to each of the at least one femtocell through the fourth interface by the second bs virtual machine. In addition, the interference coordination apparatus 100 transmits the almost blank subframe pattern allocated to the interfered at least one macro bs to each at least one macro bs through the second interface by the second bs virtual machine.
In some embodiments, the inter-base station interference coordination method further includes the interference coordination apparatus 100 generating a second almost blank subframe pattern of each of the at least one femtocell by performing complementary set operations on the first almost blank subframe pattern through the interference coordination apparatus.
In some embodiments, the inter-base station interference coordination method further includes, when one of the femtocell interferes with at least one of the macro base stations, the interference coordination apparatus 100 performing, by the interference coordinator, a joint set operation on the almost blank subframe patterns provided by the interfered macro base stations, and then performing a complementary set operation to generate a second almost blank subframe pattern allocated to the femtocell interfering with the macro base stations.
According to an embodiment of the present invention, the interference coordination apparatus 100 may execute a computer program product stored on a non-volatile computer readable medium to perform the interference coordination method embodiments of the present invention.
According to the interference coordination device and method embodiment of the present invention, the appropriate allocation of almost blank subframe patterns can be coordinated for two different roles of the aggressor base station and the victim base station of the large base station, and the interference coordination device can be implemented in a single coordination device to reduce or avoid the occurrence of the situation that the almost blank subframe patterns allocated to the aggressor and the victim collide with each other. In addition, the interference coordination method provided by the embodiment of the invention can also be applied to the environment of the coverage area of a plurality of large base stations.
Reference numerals, such as "first", "second", etc., in the description and in the claims are used for convenience of description and do not have a sequential relationship with each other.
The steps of a method or algorithm described in this specification may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module (including executable instructions and associated data) and other data may be stored in a data memory such as Random Access Memory (RAM), flash memory (flash memory), Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), registers, hard disk, portable diskette, compact disk read only memory (CD-ROM), DVD, or any other computer-readable storage media format known in the art. A storage medium may be coupled to a machine, such as, for example, a computer/processor (for convenience of description, processor is referred to herein as a "processor"), which can read information (such as program code) from, and write information to, the storage medium. A storage medium may incorporate a processor. An Application Specific Integrated Circuit (ASIC) includes a processor and a storage medium. A user equipment includes an ASIC. In other words, the processor and the storage medium are included in the user equipment without being directly connected to the user equipment. In addition, in some embodiments, any suitable computer program product includes a readable storage medium including program code associated with one or more of the disclosed embodiments. In some embodiments, the product of the computer program may comprise packaging material.
The above paragraphs use various levels of description. The teachings herein may be implemented in a variety of ways, and any specific frame or function disclosed in an example is merely a representative case. Any of the various layers disclosed herein may be implemented independently or two or more layers may be combined in any manner consistent with the teachings herein.
Although the present invention has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (30)
1. An inter-base station interference coordination apparatus, comprising:
a processor operating the first base station virtual machine to simulate the interfered base station and operating the second base station virtual machine to simulate the interfered base station; and
a transceiver coupled to the processor;
wherein the processor controls the transceiver to establish a connection between at least one large cell and the virtual machine of the first cell via a first interface, and to establish a connection between at least one large cell and the virtual machine of the second cell via a second interface, to transmit and receive data, and
the processor operates an interference coordinator to receive, from the first base station virtual machine, a first almost blank subframe pattern provided by each of the at least one macro base station, so as to reduce interference of the at least one macro base station with at least one pico base station interfered by the at least one macro base station, and so as to reduce interference of the at least one femto base station with the at least one macro base station.
2. The apparatus of claim 1, wherein the processor controls the transceiver to establish a connection between the at least one pico base station and the first base station virtual machine via a third interface, respectively, for transmitting and receiving data, wherein the interference coordinator generates respective almost blank subframe patterns allocated to the at least one pico base station interfered by the at least one macro base station, respectively, according to the first almost blank subframe pattern provided by the at least one macro base station, respectively, and transmits the respective almost blank subframe patterns allocated to the at least one pico base station via the third interface, respectively, through the first base station virtual machine.
3. The apparatus of claim 2, wherein when one of the at least one pico base station is interfered by multiple ones of the at least one large base station, the interference coordinator performs an intersection operation on the first almost blank subframe patterns provided by the multiple ones of the at least one large base station, and generates an almost blank subframe pattern allocated to the one of the at least one pico base station according to a result of the intersection operation when the first almost blank subframe patterns are intersected.
4. The inter-base station interference coordination device of claim 3, wherein when said first almost blank subframe patterns provided by multiple ones of said at least one large base station do not intersect, said interference coordinator determines which of said multiple ones of said at least one large base station provides said first almost blank subframe pattern to use to generate an almost blank subframe pattern assigned to said one of said at least one pico base station that is interfered, based on respective interference strengths corresponding to said multiple ones of said at least one large base station.
5. The inter-base station interference coordination device of claim 4, wherein the interference coordinator generates an almost blank subframe pattern assigned to the one of the at least one pico base station that is interfered according to the first almost blank subframe pattern provided by the one of the plurality of the at least one macro base station corresponding to the strongest interference strength.
6. The inter-base station interference coordination device of claim 1, wherein the interference coordinator generates a second almost blank subframe pattern for each of the at least one femtocell according to the first almost blank subframe pattern provided by each of the at least one macro base station to mitigate interference experienced by each of the at least one macro base station.
7. The apparatus of claim 6, wherein the processor controls the transceiver to establish a connection between each of the at least one femtocell and the second base station virtual machine via a fourth interface for transmitting and receiving data.
8. The inter-base station interference coordination device of claim 7, wherein the interference coordinator generates respective near blank subframe patterns assigned to the at least one macro base station with which the at least one femto base station interferes, respectively, according to the second near blank subframe patterns, wherein the interference coordinator forwards the second near blank subframe patterns to the second base station virtualizer, and wherein the second base station virtualizer forwards the respective second near blank subframe patterns of the at least one femto base station to the at least one femto base station via the fourth interface, respectively, and forwards the respective near blank subframe patterns assigned to the at least one macro base station via the second interface, respectively.
9. The apparatus of claim 6, wherein when the at least one femtocell interferes with one of the at least one macro base station, the interference coordinator complements the first almost blank subframe pattern of the one of the at least one macro base station to generate the second almost blank subframe pattern allocated to the respective at least one femtocell.
10. The inter-base station interference coordination device of claim 6, wherein when one of said at least one femtocell interferes with multiple ones of said at least one macro base station, said interference coordinator performs a joint set operation on said first almost blank subframe pattern provided by the interfered multiple ones of said at least one macro base station, and performs a complementary set operation to generate said second almost blank subframe pattern allocated to said one of said at least one femtocell.
11. A method for coordinating interference between base stations is suitable for a device for coordinating interference between base stations, and comprises the following steps:
establishing a connection between at least one large base station and a first base station virtual machine of the inter-base station interference coordination device through a first interface respectively so as to transmit and receive data, wherein the first base station virtual machine is used for simulating an interfered base station;
establishing a connection between each of the at least one large base station and a second base station virtual machine of the inter-base station interference coordination device through a second interface to transmit and receive data, wherein the second base station virtual machine is used for simulating an interferer base station; and
the interference coordinator of the inter-base station interference coordination apparatus receives the first almost blank subframe pattern provided by each of the at least one large base station from the first base station virtual machine, so as to reduce the interference of the at least one large base station to each interfered at least one pico base station, and to reduce the interference of each of the at least one large base station to at least one femto base station.
12. The inter-base station interference coordination method of claim 11, further comprising:
establishing a connection between each of the at least one pico base station and the first base station virtual machine via a third interface to transmit and receive data;
generating, by the interference coordinator, respective almost blank subframe patterns allocated to the at least one pico base station with which the at least one macro base station interferes, based on the first almost blank subframe patterns provided by the at least one macro base station, respectively; and
transmitting, by the first base station virtual machine, respective almost blank subframe patterns allocated to the at least one pico base station to each of the at least one pico base station via the third interface, respectively.
13. The inter-base station interference coordination method of claim 12, further comprising:
performing, by the interference coordinator, intersection operations on the first almost blank subframe patterns provided by the plurality of large bss when one of the at least one pico bs is interfered by the plurality of large bss; and
when there is an intersection, generating an almost blank subframe pattern allocated to the one of the at least one pico base station under interference according to the result of the intersection operation.
14. The inter-base station interference coordination method of claim 13, further comprising:
when the first almost blank subframe patterns provided by the multiple ones of the at least one large base station do not intersect, the interference coordinator determines which of the multiple ones of the at least one large base station provides the first almost blank subframe pattern to use to generate an almost blank subframe pattern allocated to the interfered one of the at least one pico base station according to respective interference strengths corresponding to the multiple ones of the at least one large base station.
15. The inter-base station interference coordination method of claim 14, further comprising:
generating, by the interference coordinator, an almost blank subframe pattern corresponding to the one of the at least one pico base station that is allocated to the interfered, based on the first almost blank subframe pattern provided by the one of the plurality of the at least one macro base station that corresponds to the strongest interference strength.
16. The method of claim 11, wherein the interference coordinator generates a second almost blank subframe pattern for each of the at least one femtocell according to the first almost blank subframe pattern provided by each of the at least one macro base station to mitigate interference experienced by each of the at least one macro base station.
17. The inter-base station interference coordination method of claim 16, further comprising:
establishing a connection between each of the at least one femtocell and the second base station virtual machine via a fourth interface to transmit and receive data.
18. The inter-base station interference coordination method of claim 17, further comprising:
generating, by the interference coordinator, respective almost blank subframe patterns allocated to the at least one macro base station with which the at least one femto base station interferes, according to the second almost blank subframe patterns, respectively;
transmitting the second almost blank subframe pattern to the second BS VM via the interference coordinator; and
transmitting, by the second base station virtual machine, the respective second almost blank subframe pattern assigned to the at least one femtocell to each of the at least one femtocell via the fourth interface, and transmitting the respective almost blank subframe pattern assigned to the at least one macro base station to each of the at least one macro base station via the second interface, respectively.
19. The inter-base station interference coordination method of claim 16, further comprising:
when the at least one femtocell interferes with one of the at least one macro bs, the interference coordinator performs complementary set operations on the first almost blank subframe pattern of one of the at least one macro bs to generate the second almost blank subframe pattern allocated to each of the at least one femtocell.
20. The inter-base station interference coordination method of claim 16, further comprising:
when one of the at least one femtocell interferes with multiple ones of the at least one macro bs, performing, by the interference coordinator, a joint set operation on the first almost blank subframe patterns provided by the interfered multiple ones of the at least one macro bs, and performing a complementary set operation to generate the second almost blank subframe pattern allocated to the one of the at least one femtocell.
21. A non-transitory computer readable medium storing a computer program product for performing the following operations:
establishing a connection between at least one large base station and a first base station virtual machine of an interference coordination device between base stations through a first interface respectively so as to transmit and receive data, wherein the first base station virtual machine is used for simulating a base station of an interfered person;
establishing a connection between each of the at least one large base station and a second base station virtual machine of the inter-base station interference coordination device through a second interface to transmit and receive data, wherein the second base station virtual machine is used for simulating an interferer base station; and
and receiving, by the interference coordinator, a first almost blank subframe pattern provided by each of the at least one macro base station from the first base station virtual machine, so as to mitigate interference of the at least one macro base station with each of the at least one pico base station and the at least one femto base station.
22. The non-transitory computer readable medium of claim 21, wherein the computer program product is further configured to perform the following steps:
establishing a connection between each of the at least one pico base station and the first base station virtual machine via a third interface to transmit and receive data;
generating, by the interference coordinator, respective almost blank subframe patterns allocated to each of the at least one pico base stations with which the at least one macro base station interferes, based on the first almost blank subframe patterns provided by each of the at least one macro base station; and
transmitting, by the first base station virtual machine, respective almost blank subframe patterns allocated to the at least one pico base station to each of the at least one pico base station via the third interface, respectively.
23. The non-transitory computer readable medium of claim 22, wherein the computer program product is further configured to perform the following steps:
performing, by the interference coordinator, intersection operations on the first almost blank subframe patterns provided by the plurality of large bss when one of the at least one pico bs is interfered by the plurality of large bss; and
when there is an intersection, generating an almost blank subframe pattern assigned to the one of the at least one pico base station according to a result of the intersection operation.
24. The non-transitory computer readable medium of claim 23, wherein the computer program product is further configured to perform the following steps:
when the first almost blank subframe patterns provided by the multiple ones of the at least one large base station do not intersect, the interference coordinator determines which of the multiple ones of the at least one large base station provides the first almost blank subframe pattern to use to generate an almost blank subframe pattern allocated to the interfered one of the at least one pico base station according to respective interference strengths corresponding to the multiple ones of the at least one large base station.
25. The non-transitory computer readable medium of claim 24, wherein the computer program product is further configured to perform the following steps:
generating, by the interference coordinator, an almost blank subframe pattern assigned to the one of the at least one pico base station that is interfered based on the first almost blank subframe pattern provided by the one of the plurality of the at least one macro base station that corresponds to the strongest interference strength.
26. The non-transitory computer readable medium of claim 21, wherein the interference coordinator generates a second almost blank subframe pattern allocated to each of the at least one femtocell according to the first almost blank subframe pattern provided by each of the at least one macro base station to mitigate interference experienced by each of the at least one macro base station.
27. The non-transitory computer readable medium of claim 26, wherein the computer program product is further configured to perform the following steps:
establishing a connection between each of the at least one femtocell and the second base station virtual machine via a fourth interface to transmit and receive data.
28. The non-transitory computer readable medium of claim 27, wherein the computer program product is further configured to perform the following steps:
generating, by the interference coordinator, respective almost blank subframe patterns allocated to the at least one macro base station with which the at least one femto base station interferes, according to the second almost blank subframe patterns, respectively;
transmitting the second almost blank subframe pattern to the second BS VM via the interference coordinator; and
transmitting, by the second base station virtual machine, the second almost blank subframe pattern assigned to each of the at least one femtocell via the fourth interface, respectively, and transmitting the corresponding almost blank subframe pattern assigned to each of the at least one macro base station via the second interface, respectively.
29. The non-transitory computer readable medium of claim 26, wherein the computer program product is further configured to perform the following steps:
when the at least one femtocell interferes with one of the at least one macro bs, the interference coordinator performs complementary set operations on the first almost blank subframe pattern of one of the at least one macro bs to generate the second almost blank subframe pattern allocated to each of the at least one femtocell.
30. The non-transitory computer readable medium of claim 26, wherein the computer program product is further configured to perform the following steps:
when one of the at least one femtocell interferes with multiple ones of the at least one macro bs, performing, by the interference coordinator, a joint set operation on the first almost blank subframe patterns provided by the interfered multiple ones of the at least one macro bs, and performing a complementary set operation to generate the second almost blank subframe pattern allocated to the one of the at least one femtocell.
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| TWI705669B (en) | 2020-09-21 |
| TW202025649A (en) | 2020-07-01 |
| CN111355511B (en) | 2021-10-12 |
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