CN111867062A

CN111867062A - Method and apparatus for interference coordination

Info

Publication number: CN111867062A
Application number: CN201910345915.9A
Authority: CN
Inventors: 苏笛; 张闯; 林鹏; 钱辰
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-10-30

Abstract

The present disclosure discloses a base station for performing inter-base station interference coordination, including: a transceiver configured to transmit and/or receive a signal; and a processor configured to: controlling the transceiver to receive a physical signal transmitted by the second base station and to perform interference measurement based on the received physical signal; and controlling the transceiver to report the interference measurement result to a second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station based on the interference measurement result reported by the first base station or the configuration of the management center.

Description

Method and apparatus for interference coordination

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method and a base station for inter-base station interference coordination in a wireless communication system.

Background

According to ITU estimates, the global monthly mobile data traffic will reach 62 octets (Exa Byte, 1EB ^ 2^30GB) by 2020, while the global mobile data service will grow at about 55% per year from 2020to 2030. In addition, the proportion of video service and machine-to-machine communication service in mobile data service is gradually increasing, in 2030, the video service is 6 times of non-video service, and the machine-to-machine communication service accounts for about 12% of the mobile data service ("IMT traffic identifications for the years 2020to 2030, Report ITU-R M.2370-0").

The rapid growth of mobile data services, especially the exponential growth of high definition video and ultra-high definition video services, puts higher demands on the transmission rate of wireless communication, and in order to meet the growing mobile service demands, people need to provide a new technology on the basis of 4G or 5G to further improve the transmission rate and throughput of a wireless communication system. The full-duplex technology can further improve the frequency spectrum utilization rate on the existing system, and the full-duplex system allows the uplink and downlink of a user to transmit simultaneously in a time domain and a frequency domain, different from the traditional half-duplex system which adopts time domain (TDD) or frequency domain (FDD) orthogonal division for the uplink and the downlink, so that the full-duplex system can theoretically achieve twice throughput of the half-duplex system.

However, due to the co-frequency of the uplink and downlink, the transmission signal of the full-duplex device may generate strong self-interference to the received signal, and the self-interference signal may be even 120 dB higher than the background noise. In order for full duplex devices to work, the primary problem is to design a scheme to eliminate self-interference. Many studies are currently made on self-interference cancellation, and the strength of a self-interference signal can be reduced to at least the same level as that of the background noise by adopting a plurality of cancellation methods, for example, an analog cancellation method, a digital-assisted analog cancellation method, a digital cancellation method, and the like.

When full duplex is used in a cellular network scenario, the interference situation becomes more complex. The interference sources are more and the interference strength is greater in a full duplex cellular system compared to a conventional non-full duplex cellular network. When at least one of the adjacent cells performs full duplex transmission, when any one of the adjacent cells performs uplink reception, the interference caused by downlink transmission of the adjacent cell may be received, which is referred to as cross link interference between the adjacent cells and the base station. This interference does not exist in conventional non-full duplex systems: in the time division duplex system, the same uplink and downlink subframe configuration is generally assumed to be adopted between adjacent cells, so that the condition that the transmission directions of the adjacent cells on a certain subframe are different does not exist; the frequency point planning of the frequency division duplex system can ensure that adjacent cells can not transmit in different directions on the same frequency band.

Disclosure of Invention

Technical problem

The new air interface protocol of the 5 th generation communication system introduces a dynamic time division duplex technology, namely, a base station is allowed to dynamically determine certain time slots or time domain symbols for uplink transmission or downlink transmission in a scheduling mode, and the new air interface protocol is not restricted by the configuration of cell-level uplink and downlink subframes. In this case, even if the neighboring cells use the same uplink and downlink subframe configuration, inter-base station cross-link interference may occur in some time slots or time domain symbols dynamically determined by the base station.

For such interference, a management center (typically, an Operation Administration and Maintenance unit (OAM)) in the conventional system coordinates a dynamic subframe configuration of an adjacent base station according to an interference condition reported by the base station, for example, the adjacent base station avoids performing downlink scheduling on a physical resource causing the interference.

When full duplex is used in a cellular network scenario, the interference situation becomes more complex. The interference sources are more and the interference strength is greater in a full duplex cellular system compared to a conventional non-full duplex cellular network. When at least one of the adjacent cells performs full duplex transmission, when viewed from the base station side, any one of the base stations may be interfered by downlink transmission of the adjacent cell (cross link interference between the base stations of the adjacent cells) during uplink reception.

However, when the existing interference coordination method is also used in the full duplex system, it means that the adjacent base station is forced to perform uplink transmission only on the physical resource causing interference, and this way will sacrifice the spectrum efficiency of the full duplex system, and is not effective in solving the problem of cross link interference between the adjacent cell base stations of the full duplex system.

Technical scheme

According to an aspect of the present disclosure, there is provided an inter-base station interference coordination method, including: the first base station receiving a physical signal transmitted by the second base station and performing interference measurement based on the received physical signal; the first base station reports the interference measurement result to the second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

The method further comprises the following steps: wherein the physical signal includes an inter-base station measurement physical signal transmitted on one or more frequency subbands, and wherein the inter-base station measurement physical signal is repeatedly transmitted on each frequency subband in a plurality of transmission periods, and wherein at least two copies of the inter-base station measurement physical signal having different copy indexes are repeatedly transmitted on each frequency subband in the same transmission period.

The method further comprises the following steps: the manner of repeatedly transmitting multiple copies with different copy indexes of the physical signal in the same transmission period on each frequency sub-band by the inter-base station measurement at least comprises one of the following: at least two copies of the same complex-valued symbol of the inter-base station measurement physical signal are transmitted on each frequency subband by the second base station in the same transmission period with different analog transmission beams; at least two copies of the same complex-valued symbol of the inter-base station measurement physical signal are transmitted on each frequency subband by the second base station in different digital transmission beams within the same transmission period; or copies of at least two same complex-valued symbols of the inter-base station measurement physical signal are transmitted by the second base station on each frequency subband in the same transmission period with the same analog transmission beam and the same digital transmission beam.

The method further comprises the following steps: wherein the first base station receives the physical signal transmitted by the second base station and performs interference measurement based on the received physical signal comprises: the first base station averages the inter-base station interference signal strengths of the copies of the same copy index in different transmission periods to obtain an average inter-base station interference signal strength for each frequency subband and each copy index.

The method further comprises the following steps: wherein the step of the first base station receiving the physical signal transmitted by the second base station and performing interference measurement based on the received physical signal further comprises: the first base station obtains at least one of the following as an interference measurement: the method comprises the steps of averaging inter-base station interference signal strength of each frequency subband and each replica index, replica indexes of M replicas with strongest average inter-base station interference signal strength in each frequency subband, averaging inter-base station interference signal strength of the M replicas in each frequency subband, and a transmission power reduction value when a second base station performs downlink transmission in each frequency subband by using a transmission beam corresponding to the M replicas, wherein M is a positive integer, and is configured or a system preset value by a management center.

The method further comprises the following steps: wherein the step of the first base station receiving the physical signal transmitted by the second base station and performing interference measurement based on the received physical signal further comprises: the first base station obtains at least one of the following as an interference measurement: the method comprises the steps of obtaining an average inter-base station interference signal strength for each frequency sub-band and each replica index, replica indexes of M replicas in a plurality of replicas with the average inter-base station interference signal strength within each frequency sub-band larger than a preset threshold value, average inter-base station interference signal strengths of the M replicas within each frequency sub-band, and a transmission power drop value when a second base station performs downlink transmission by using a transmission beam corresponding to the M replicas within each frequency sub-band, wherein M is a positive integer and M is less than or equal to X, wherein X is a positive integer and is configured by a management center or is a preset value of a system.

The method further comprises the following steps: wherein, the interference measurement result reported by the first base station to the management center is used by the management center to obtain at least one of the following configurations as the management center: average inter-base station interference signal strength aiming at each frequency sub-band and each replica index, replica indexes of the M replicas, average inter-base station interference signal strength of the M replicas in each frequency sub-band, and a transmission power reduction value when a second base station performs downlink transmission by using a transmission beam corresponding to the M replicas in each frequency sub-band; and wherein the configuration of the management center is sent by the management center to the second base station.

The method further comprises the following steps: wherein, the interference measurement result reported by the first base station or the configuration of the management center is used by the second base station to execute the following steps: determining a transmitting wave beam corresponding to an interference measurement result reported by a first base station or the configuration of a management center; and performing the following steps for K transmit beams among the determined transmit beams: the K transmitting beams are not used in all time frequency resources or specific time frequency resources of the system for downlink transmission; or further determining the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performing downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams; wherein K is a positive integer and K is ≦ M ≦ number of frequency subbands.

The method further comprises the following steps: wherein the specific time-frequency resource comprises one of the following: managing time-frequency resources which are configured by the center and used for interference coordination; or the second base station acquires the time-frequency resource for interference coordination according to a preset rule, wherein the preset rule comprises: taking a fixed section of frequency band in a system bandwidth as a frequency domain resource for interference coordination; taking a fixed single subframe or a fixed time slot or a time domain symbol in the time slot as a time domain resource for interference coordination; a combination of the above frequency domain resources and time domain resources.

The method further comprises the following steps: the step of reporting the interference measurement result to the second base station or the management center by the first base station so that the second base station performs interference coordination at least for the first base station according to the interference measurement result reported by the first base station or the configuration of the management center includes: the first base station accesses the cell of the second base station and reports the interference measurement result to the second base station through the access link, including: the first base station carries the interference measurement result in the random access process Msg3 of the cell to which the second base station belongs, or the first base station carries the interference measurement result in the uplink shared channel in the two-step random access process MsgA of the cell to which the second base station belongs, or the first base station reports the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the second base station.

The method further comprises the following steps: wherein the step of the first base station receiving the physical signal transmitted by the second base station comprises: the first base station receives a physical signal transmitted by the second base station in response to the uplink received interference energy being above a predetermined interference energy threshold.

The method further comprises the following steps: the first base station configures a full duplex bandwidth or bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or bandwidth portion of the first base station and the second base station do not overlap or do not completely overlap.

The method further comprises the following steps: the step of configuring the full duplex bandwidth or the bandwidth part in the system bandwidth by the first base station comprises the following steps: based on the system bandwidth, the full-duplex bandwidth, the coordination multiplexing factor, and the cell identifier of the first base station, a starting position and a frequency domain range of the full-duplex bandwidth or the bandwidth portion of the first base station are determined.

According to another aspect of the present disclosure, there is provided an inter-base station interference coordination method, including: the second base station sends a physical signal to the first base station so that the first base station can carry out interference measurement based on the physical signal sent by the second base station and report the interference measurement result to the second base station or a management center; and the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

The method further comprises the following steps: the manner of repeatedly transmitting multiple copies with different copy indexes of the physical signal in the same transmission period on each frequency sub-band by the inter-base station measurement at least comprises one of the following: the second base station transmits at least two copies of the same complex-valued symbol of the measured physical signal between the base stations on each frequency subband in the same transmission period by using different analog transmission beams; the second base station transmits at least two copies of the same complex-valued symbol of the inter-base station measurement physical signal on each frequency subband in the same transmission period by using different digital transmission beams; or the second base station transmits the copies of at least two same complex-valued symbols of the inter-base station measurement physical signal on each frequency subband in the same transmission period with the same analog transmission beam and the same digital transmission beam.

The method further comprises the following steps: the inter-base station measurement physical signal is used by the first base station for averaging the inter-base station interference signal strengths of the copies of the same copy index in different transmission periods to obtain an average inter-base station interference signal strength for each frequency subband and each copy index.

The method further comprises the following steps: wherein the inter-base station measurement physical signal is used by the first base station to obtain at least one of the following as an interference measurement result: the method comprises the steps of aiming at each frequency subband and the average inter-base station interference signal strength of each copy index, the copy indexes of M copies with the strongest average inter-base station interference signal strength in each frequency subband, the average inter-base station interference signal strength of the M copies in each frequency subband, and a transmission power reduction value when a second base station uses a transmission beam corresponding to the M copies to perform downlink transmission in each frequency subband, wherein M is a positive integer and is configured by a management center or is a system preset value.

The method further comprises the following steps: wherein the inter-base station measurement physical signal is used by the first base station to obtain at least one of the following as an interference measurement result: the average inter-base station interference signal strength for each frequency subband and each replica index, the replica index of M replicas among a plurality of replicas whose average inter-base station interference signal strength within each frequency subband is greater than a predetermined threshold, the average inter-base station interference signal strength of the M replicas within each frequency subband, and a transmission power drop value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas within each frequency subband, where M is a positive integer and M ≦ X, where X is a positive integer and is configured by a management center or a system predetermined value.

The method further comprises the following steps: wherein the interference measurement result is used by a management center to obtain at least one of the following as a configuration of the management center: average inter-base station interference signal strength for each frequency subband and each replica index, replica indexes of the M replicas, average inter-base station interference signal strength of the M replicas in each frequency subband, and a transmission power drop value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas in each frequency subband; and wherein the configuration of the management center is sent by the management center to the second base station.

The method further comprises the following steps: the step of the second base station performing interference coordination at least for the first base station according to the interference measurement result reported by the first base station or the configuration of the management center includes: determining a transmitting wave beam corresponding to an interference measurement result reported by a first base station or the configuration of a management center; and

performing the following steps for K transmit beams among the determined transmit beams: the K transmitting beams are not used in all time frequency resources or specific time frequency resources of the system for downlink transmission; or further determining the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performing downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams; wherein K is a positive integer and K is ≦ M ≦ number of frequency subbands.

The method further comprises the following steps: wherein the interference measurement result is obtained by the second base station from the first base station by: the second base station accesses the access link of the cell to which the second base station belongs through the first base station to obtain the interference measurement result, and the method comprises the following steps: the second base station obtains the interference measurement result in the random access process Msg3 of the cell to which the first base station and the second base station belong, or the second base station obtains the interference measurement result in the uplink shared channel in the two-step random access process MsgA of the cell to which the first base station and the second base station belong, or the second base station obtains the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the second base station.

The method further comprises the following steps: wherein the physical signal transmitted by the second base station to the first base station is received by the first base station in response to the uplink received interference energy being above a predetermined interference energy threshold.

The method further comprises the following steps: the second base station configures a full duplex bandwidth or bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or bandwidth portion of the first base station and the second base station do not overlap or do not completely overlap.

The method further comprises the following steps: the step of configuring the full duplex bandwidth or the bandwidth part in the system bandwidth by the second base station comprises the following steps: based on the system bandwidth, the full-duplex bandwidth, the coordination multiplexing factor, and the cell identifier of the second base station, a starting position and a frequency domain range of the full-duplex bandwidth or the bandwidth portion of the second base station are determined.

According to another aspect of the present disclosure, there is provided an inter-base station interference coordination method, including: the first base station receiving a physical signal transmitted by the second base station and performing interference measurement based on the received physical signal; the first base station reports the interference measurement result to a second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

The method further comprises the following steps: the method for the inter-base station measuring multiple copies of the physical signal with different copy indexes to be repeatedly transmitted on each frequency sub-band in the same transmission period at least comprises one of the following steps: the second base station sends at least two copies of the same complex-valued symbol in different analog transmission beams; the second base station transmits at least two copies of the same complex-valued symbol in different digital transmit beams; or the second base station transmits at least two copies of the same complex-valued symbol in the same analog transmit beam and the same digital transmit beam.

The method further comprises the following steps: the first base station averages the received signal strength of the inter-base station measurement physical signal copies of different transmission periods, the same frequency sub-band and the same copy index to obtain the average inter-base station interference signal strength for each frequency sub-band and each copy index.

The method further comprises the following steps: the first base station obtains at least one of the following as an interference measurement: the method comprises the steps of aiming at each frequency subband and the average inter-base station interference signal strength of each copy index, the copy indexes of M copies with the strongest average inter-base station interference signal strength in each frequency subband, the average inter-base station interference signal strength of the M copies in each frequency subband, and a transmission power reduction value when a second base station performs downlink transmission by using a transmission beam corresponding to the M copies in each frequency subband, wherein M is a positive integer, and is configured or a system preset value by a management center.

The method further comprises the following steps: the first base station obtains at least one of the following as an interference measurement: the average inter-base station interference signal strength for each frequency sub-band and each replica index, the replica index of M replicas among a plurality of replicas in which the average inter-base station interference signal strength in each frequency sub-band is greater than a predetermined threshold, the average inter-base station interference signal strength of the M replicas in each frequency sub-band, and a transmission power drop value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas in each frequency sub-band, where M is a positive integer and M ≦ X, where X is a positive integer and is configured by a management center or a system predetermined value.

The method further comprises the following steps: the management center obtains at least one of the following interference measurement results from the interference measurement results reported by the first base station as the configuration of the management center: average inter-base station interference signal strength for each frequency sub-band and each replica index, replica indexes of the M replicas, average inter-base station interference signal strength of the M replicas in each frequency sub-band, and a transmission power reduction value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas in each frequency sub-band; and the management center sends the configuration of the management center to the second base station.

The method further comprises the following steps: determining a transmitting beam corresponding to the interference measurement result reported by the first base station or the configuration of the management center by the second base station; and performing the following steps for K transmit beams among the determined transmit beams: the second base station does not use the K transmitting beams to carry out downlink transmission in all time frequency resources or specific time frequency resources of the system; or the second base station further determines the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performs downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams; wherein K is a positive integer and K is ≦ M ≦ number of frequency subbands.

The method further comprises the following steps: the first base station accesses the cell to which the second base station belongs, and reports the interference measurement result to the second base station through the access link, including: the first base station carries the interference measurement result in the random access process Msg3 of the cell to which the second base station belongs, or the first base station carries the interference measurement result in the uplink shared channel in the two-step random access process MsgA of the cell to which the second base station belongs, or the first base station reports the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the second base station.

The method further comprises the following steps: the first base station receives a physical signal transmitted by the second base station in response to the uplink received interference energy being above a predetermined interference energy threshold.

The method further comprises the following steps: at least one of the first base station and the second base station configures a full duplex bandwidth or a bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or the bandwidth portion of the first base station and the second base station do not overlap or do not completely overlap.

The method further comprises the following steps: determining a starting position and a frequency domain range of a full duplex bandwidth or a bandwidth portion of the at least one of the first base station and the second base station based on at least one of a system bandwidth, the full duplex bandwidth, a coordinated multiplexing factor, and a cell identifier of the at least one of the first base station and the second base station.

The method further comprises the following steps: the first base station acquires the cell identification of the cell to which the second base station belongs so as to complete downlink synchronization of the cell to which the second base station belongs or the first base station acquires the cell identification of the cell to which the second base station belongs according to an adjacent cell identification list configured by an operation management and maintenance unit management center and receives a downlink synchronization signal of the cell to which the second base station belongs so as to complete downlink synchronization of the cell to which the second base station belongs.

The method further comprises the following steps: wherein the inter-base station measurement physical signal comprises one of the following: the downlink physical signal of the second base station and the inter-dedicated base station measurement physical signal sent by the second base station, wherein the downlink physical signal of the second base station includes one of the following: a synchronization signal block, a channel state information reference signal, wherein the synchronization signal block comprises one of: the system comprises a downlink main synchronous signal, a downlink auxiliary synchronous signal and a demodulation reference signal of a physical broadcast channel.

The method further comprises the following steps: wherein the plurality of frequency subbands is one of: a different bandwidth portion; or different frequency sub-bands divided in a system bandwidth by a predetermined frequency interval; or different frequency sub-bands divided in a bandwidth part at predetermined frequency intervals.

The method further comprises the following steps: the first base station acquires the configuration parameters of the inter-base station measurement physical signal sent by the second base station, and the configuration parameters include one of the following: measuring a transmission period of a physical signal, measuring a time domain starting position offset in the transmission period of the physical signal, measuring a repetition number or a single transmission duration in the transmission period of the physical signal, measuring a transmission frequency/bandwidth of the physical signal, a synchronous signal block subcarrier offset, measuring a subcarrier interval of the physical signal, measuring a sequence of the physical signal, and measuring a frequency interval of the physical signal for transmitting at a certain interval.

The method further comprises the following steps: the first base station acquires configuration parameters of the inter-base station measurement physical signals sent by the second base station by receiving user-specific signaling or system messages sent by the second base station; or, the first base station obtains the configuration parameters of the inter-base station measurement physical signals sent by the second base station by receiving the management center configuration sent by the management center.

The method further comprises the following steps: and the second base station configures the unavailable resource of the physical resource which is not used for uplink and/or downlink transmission of the terminal in the cell to which the second base station belongs, so that the unavailable resource is used for the second base station to send the inter-base station measurement physical signal.

The method further comprises the following steps: the second base station receives management center configuration information, which comprises at least one of the following: measuring the sending period of the physical signal, the repetition times of the physical signal in the period and the sending frequency interval of the physical signal by the base station; and the second base station configures time domain and frequency domain resources for transmitting the inter-base station measurement physical signals as the unavailable resources based on the management center configuration information.

The method further comprises the following steps: the first base station configures unavailable resources of physical resources, which are not used for uplink and/or downlink transmission, of a terminal in a cell to which the first base station belongs, so as to receive an inter-base station measurement physical signal from the second base station.

The method further comprises the following steps: the first base station configures physical resource indication information for sending inter-base station measurement physical signals configured by a management center or configures uplink unavailable resources or uplink and downlink unavailable resources of a terminal through high-level signaling, wherein the high-level signaling can be system information or user group specific signaling or user specific signaling.

According to another aspect of the present disclosure, there is provided an inter-base station interference coordination method, including: the second base station sends a physical signal to the first base station so that the first base station can carry out interference measurement based on the physical signal sent by the second base station and report the interference measurement result to the second base station or a management center; and the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center. .

The method further comprises the following steps: the first base station averages the interference signal strength among the base stations of the copies with different sending periods, the same frequency sub-band and the same copy index to obtain the average interference signal strength among the base stations aiming at each frequency sub-band and each copy index.

The method further comprises the following steps: the first base station obtains at least one of the following as an interference measurement: the average inter-base station interference signal strength for each frequency sub-band and each replica index, the replica index of M replicas among a plurality of replicas in which the average inter-base station interference signal strength in each frequency sub-band is greater than a predetermined threshold, the average inter-base station interference signal strength of the M replicas in each frequency sub-band, and a transmission power drop value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas in each frequency sub-band, wherein M is a positive integer and M ≦ X, wherein X is a positive integer and is configured by a management center or is a system predetermined value.

The method further comprises the following steps: the second base station receiving interference measurements from the first base station over the access link, comprising: the second base station obtains the interference measurement result through a random access process Msg3 of the cell to which the first base station and the second base station belong, or the second base station obtains the interference measurement result through an uplink shared channel in a two-step random access process MsgA of the cell to which the first base station and the second base station belong, or the second base station obtains the interference measurement result on a semi-persistent scheduling physical resource configured to the first base station by the second base station.

The method further comprises the following steps: the second base station transmits a physical signal to the first base station in response to the uplink received interference energy being above a predetermined interference energy threshold.

The method further comprises the following steps: the first base station acquires the cell identification of the cell to which the second base station belongs so as to complete downlink synchronization of the cell to which the second base station belongs, or the first base station acquires the cell identification of the cell to which the second base station belongs according to an adjacent cell identification list configured by the management center and receives a downlink synchronization signal of the cell to which the second base station belongs so as to complete downlink synchronization of the cell to which the second base station belongs.

The method further comprises the following steps: the second base station sends the configuration parameters of the inter-base station measurement physical signals to the first base station, and the configuration parameters comprise one of the following: measuring a transmission period of a physical signal, a time domain starting position offset in the transmission period of the physical signal, a repetition number or single transmission duration in the transmission period of the physical signal, a transmission frequency/bandwidth of the physical signal, a synchronous signal block subcarrier offset, a subcarrier interval of the physical signal, a sequence of the physical signal, and a frequency interval of the physical signal.

The method further comprises the following steps: wherein, the second base station transmits the configuration parameters of the inter-base station measurement physical signals to the first base station by transmitting user-specific signaling or system messages to the first base station; or, the first base station obtains the configuration parameters of the inter-base station measurement physical signals sent by the second base station by receiving the management center configuration sent by the management center.

According to still another aspect of the present disclosure, there is provided a first base station for performing inter-base station interference coordination, including: a transceiver configured to transmit and/or receive a signal; and a processor configured to: controlling the transceiver to receive a physical signal transmitted by the second base station and to perform interference measurement based on the received physical signal; and controlling the transceiver to report the interference measurement result to a second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station based on the interference measurement result reported by the first base station or the configuration of the management center.

According to still another aspect of the present disclosure, there is provided a second base station for performing inter-base station interference coordination, including: a transceiver configured to transmit data and/or receive data; and a processor configured to: the controller transceiver transmits a physical signal to the first base station so that the first base station performs interference measurement based on the physical signal transmitted by the second base station and reports the interference measurement result to the second base station or a management center;

and performing interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

Technical effects

The disclosure is directed to designing an interference coordination scheme, which includes steps of interference measurement, interference measurement result reporting, interference coordination based on the interference measurement result, and the like. The scheme can be used for processing the cross link interference between the base stations of the adjacent cells in the full-duplex cellular network, and effectively reduces the interference energy of the base station side in the full-duplex cellular network.

Drawings

Fig. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present disclosure;

fig. 2 is a flow chart illustrating an interference coordination method according to an embodiment of the present disclosure;

fig. 3 is a flow chart illustrating an interference coordination method according to an embodiment of the present disclosure;

fig. 4 illustrates an inter-base station measurement physical signal according to an embodiment of the present disclosure;

fig. 5 illustrates an inter-base station measurement physical signal repeatedly transmitted over a plurality of time domain periods on a plurality of frequency subbands according to an embodiment of the present disclosure;

fig. 6 is a flow chart illustrating an interference coordination method according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating a full duplex configuration according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram illustrating a full-duplex configuration according to an embodiment of the present disclosure;

fig. 9 illustrates a structure of a first base station according to an embodiment of the present disclosure;

Fig. 10 illustrates a structure of an interfering base station according to an embodiment of the present disclosure;

fig. 11 shows a flow diagram of an interference coordination method performed by a first base station according to an embodiment of the present disclosure;

fig. 12 shows a flow diagram of an interference coordination method performed by an interfering base station according to an embodiment of the present disclosure;

fig. 13 shows a flow chart further illustrating the interference coordination method shown in fig. 11, in accordance with an embodiment of the present disclosure;

fig. 14 shows a flow chart further illustrating the interference coordination method shown in fig. 12, according to an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to specific embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. While the disclosure will be described in conjunction with the specific embodiments, it will be understood that it is not intended to limit the disclosure to the described embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the disclosure as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.

For a better understanding of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings and specific embodiments.

Note that the example to be presented next is only a specific example, and is not to be construed as limiting the embodiments of the present disclosure to the specific shapes, hardware, connections, steps, values, conditions, data, orders, and the like shown and described. Those skilled in the art can, upon reading this specification, utilize the disclosed concepts to construct additional embodiments not described in the specification.

All embodiments described below are applicable to a wireless cellular communication system as shown in fig. 1. Fig. 1 includes

several base stations

100, 102, 104, and 106, and (optionally) a management center (e.g., OAM)110 that manages these base stations. Wherein each of the

base stations

100, 102, 104, 106 may be subject to interference from other base stations. Although only four base stations are shown, there may be more or fewer base stations. Although one OAM is shown, there may be no OAM, but there may be more OAM. Hereinafter, the OAM is explained as an example of the management center, but the management center is not limited to the OAM.

A method of performing interference coordination when a first base station is interfered by an interfering base station (hereinafter, may also be referred to as a "second base station") will be described below with reference to fig. 2. Wherein, the number of the interference base stations can be one or more. In the following, a single interfering bs is taken as an example for explanation, and when there are multiple interfering bss, the following steps may be repeatedly performed in sequence to perform inter-cell interference measurement on the multiple interfering bss in turn according to the present disclosure.

Fig. 2 illustrates a method 20 of performing interference coordination according to an embodiment of the present disclosure.

In step 200, the first base station may determine that the detected uplink received interference energy from the interfering base station is too high, thereby triggering an operation of interference measurement. The condition that the first base station determines that the uplink received interference energy is too high may be that the interference energy is higher than a threshold. Specifically, the threshold may be set by the base station itself, or may be configured by OAM. When the first base station detects that the uplink received interference energy is too high, the first base station may report to the OAM to trigger the OAM to perform inter-base station interference measurement related configuration. It should be noted that the foregoing operation of reporting to the OAM by the first base station is not necessary, and the OAM may directly configure the configuration parameters related to the interference measurement between the base stations for the first base station and the interfering base station in the management area. The first base station may perform subsequent interference coordination only when the uplink received interference energy is too high, otherwise, perform no subsequent interference coordination, so as to save the overhead caused by the interference coordination operation.

Of course, the trigger condition for the first base station to start the inter-cell interference measurement operation is not limited to the above condition, and may be performed periodically or non-periodically without the trigger condition. I.e., step 200 is not necessary.

In step 210, the first base station may receive a physical signal transmitted by the interfering base station, perform inter-cell interference measurement based on the physical signal, and generate an interference measurement report. Wherein, the number of the interference base stations can be one or more. As described above, when there are multiple interfering base stations, the following steps may be repeatedly performed in sequence, and the inter-cell interference measurement according to the present disclosure may be performed on the multiple interfering base stations in sequence. Specifically, the way for the first base station to identify the interfering base stations and sequentially perform the inter-Cell interference measurement according to the identification result may be that the first base station receives, from the OAM, a unique Cell Identity (Cell ID) list of the Cell to which the interfering base station belongs; or, the first base station obtains the Cell ID of the Cell to which the interference base station belongs through Cell search. In this way, the inter-Cell interference measurement of each Cell is sequentially performed based on the plurality of Cell IDs of the identified plurality of interfering base stations. In addition, the first base station can also identify those base stations causing too strong uplink reception interference based on the Cell ID of the local Cell, for example, a Cell having a Cell ID value difference from the Cell in which the first base station is located, which is not greater than N, where N may be set by the first base station itself or configured by OAM.

In step 220, the first base station reports an interference measurement report to the OAM or the interfering base station. Specifically, the way for reporting the interference measurement result by the first base station may be that the first base station reports the interference measurement result to the OAM through the backhaul link; or the first base station reports the interference measurement result to the interference base station through the access link. Of course, the reporting method is not limited to this, and the first base station can report the interference measurement report to multiple entities in the wireless network in multiple ways.

In step 230, the interfering base station performs interference coordination according to the OAM configuration received from the OAM or the interference measurement report reported to the interfering base station by the first base station.

The method shown in fig. 2 will be described in more detail below in connection with fig. 3. Fig. 3 is a flow chart illustrating an interference coordination method 3000 performed jointly by a first base station 3100 and an interfering base station 3200 according to an embodiment of the disclosure.

The interference coordination method shown in fig. 3 is a beam-based interference coordination method. Wherein the interfering base station 3200 of the first base station 3100 may be one or more. The following description is given by way of example of a single interfering base station 3200. When the number of the interference base stations is multiple, the steps described in the method can be repeatedly and sequentially executed, and the inter-cell interference measurement can be sequentially performed on the multiple interference base stations.

In step 301, the first base station 3100 determines that the detected uplink received interference energy from the interfering base station is too high. Step 301 is the same as step 210 and will not be described herein.

In step 303, the first base station 3100 receives a downlink synchronization signal sent by the interfering base station 3200, obtains a Cell ID of a Cell (referred to as an interfering Cell for short) to which the interfering base station belongs, and completes downlink synchronization on the interfering Cell; or, the first base station acquires the Cell ID of the interfering Cell according to the neighboring Cell ID list configured by the OAM, and receives the downlink synchronization signal of the interfering Cell to complete downlink synchronization of the interfering Cell.

Optionally, in step 305, the interfering base station 3200 may configure unavailable resources of the terminals within the interfering cell. The unavailable resource means a physical resource that is not used for interfering with uplink and/or downlink transmission of a connected terminal within a cell. The unavailable resource can be used for sending a physical measurement signal between base stations by the interfering base station, so as to ensure that a terminal in the interfering cell does not receive unexpected downlink transmission. As a specific example, the interfering base station 3200 receives physical resource indication information configured by the OAM and used for transmitting the inter-base station measurement physical signal, and indicates time domain and frequency domain resources used for transmitting the inter-base station measurement physical signal. The interference base station 3200 configures downlink unavailable resources or uplink and downlink unavailable resources of the terminal through high-level signaling, where the high-level signaling may be system information or user group specific signaling or user specific signaling. A simple implementation may be that the interfering base station 3200 transmits the inter-base station measurement physical signal on a fixed subframe or subframes, wherein the fixed subframe for transmitting the inter-base station measurement physical signal, and the interfering base station transmits a plurality of repetitions of the inter-base station measurement physical signal in each subframe. The interference base station 3200 receives a transmission period of the inter-base station measurement physical signal configured by the OAM, and/or a repetition number of the inter-base station measurement physical signal in the period, and/or a transmission frequency interval of the inter-base station measurement physical signal, and periodically transmits the inter-base station measurement physical signal on a preset fixed subframe; meanwhile, the interfering base station 3200 configures time domain and frequency domain resources for sending inter-base station measurement physical signals as unavailable resources for downlink transmission of a terminal in the cell, and the downlink transmission meaning of the terminal at least comprises one of the following: the method comprises the steps of physical downlink broadcast channel transmission, physical downlink shared channel transmission, a physical downlink control channel, a downlink reference signal, a channel state information reference signal and a positioning reference signal.

Optionally, in step 307, the first base station 3100 configures an unavailable resource of the terminal in the cell. The unavailable resource means a physical resource which is not used for uplink transmission or uplink and downlink transmission of a connected terminal in a cell to which the first base station 3100 belongs. The unavailable resource may be a physical resource for the first base station 3100 to receive the inter-base station measurement physical signal, so as to ensure that the first base station 3100 is not interfered by uplink or downlink transmission of the cell when performing inter-base station interference measurement. As a specific example, the first base station 3100 receives physical resource indication information configured by the OAM and used for sending the inter-base station measurement physical signal, and indicates a time domain resource and a frequency domain resource used for transmission of the inter-base station measurement physical signal. The first base station 3100 configures uplink unavailable resources or uplink and downlink unavailable resources of the terminal through high-level signaling, which may be system messages or user group-specific signaling or user-specific signaling.

Although

steps

305 and 307 are shown in fig. 3 as being performed before step 311 in tandem, steps 305 and 307 may be performed before step 311 in any order, or may be omitted.

In step 309, the first base station 3100 acquires configuration parameters of inter-base station measurement physical signals transmitted by the interfering base station 3200. The configuration parameter content of the first base station 3100 acquiring the interference base station sending the inter-base station measurement physical signal at least includes one of a sending period of the inter-base station measurement physical signal, a time domain start position offset in the period of the inter-base station measurement physical signal, a repetition number/single sending duration in the period of the inter-base station measurement physical signal, a sending frequency/bandwidth of the inter-base station measurement physical signal, a synchronization signal block subcarrier offset, a subcarrier interval of the inter-base station measurement physical signal, a sequence of the inter-base station measurement physical signal, and a frequency interval of the inter-base station measurement physical signal sent at a certain frequency. The method for acquiring the configuration parameters of the inter-base station measurement physical signal sent by the interfering base station 3200 by the first base station 3100 may be that the first base station 3100 acquires by receiving a user-specific signaling or a system message sent by the interfering base station 3200; alternatively, the first base station 3100 is acquired through OAM configuration. By acquiring the configuration parameters of the inter-base station measurement physical signal transmitted by the interfering base station 3200, the first base station 3100 can more efficiently receive the inter-base station measurement physical signal.

In step 311, the first base station 3100 receives an inter-base station measurement physical signal transmitted by the interfering base station 3200. The inter-base station measurement physical signal may be a downlink physical signal in an interfering cell, such as a synchronization signal block, a channel state information reference signal, and the like; or may be a dedicated inter-base station measurement physical signal transmitted by the interfering base station 3200.

Specifically, the inter-base station measurement physical signal may be a time domain periodic signal, and referring to fig. 4, an example of the periodically transmitted inter-base station measurement physical signal is given in fig. 4, where the inter-base station measurement physical signal is transmitted at a certain period, multiple (e.g., at least two) copies of the inter-base station measurement physical signal are repeatedly transmitted in the same transmission period, and the multiple copies in the same period have different copy index values. The copies are indexed by index numbers, such as index #0, index #1 … … and index # n, wherein the copies may be sequentially indexed in time order or may not be indexed in any order, as long as the copies and the index numbers correspond to each other. More specifically, the meaning of multiple copies of the inter-base station measurement physical signal transmitted in the same transmission period may be that the interfering base station transmits copies of the same complex-valued symbol in different analog transmission beams; or, the interfering base station 3200 sends copies of the same complex-valued symbol with different digital transmit beams; or the interfering base station 3200 sends copies of the same complex-valued symbol with the same analog transmit beam and the same digital transmit beam. An example of the periodic inter-base station measurement physical signal may be a synchronization signal block sent by the interfering base station 3200 in downlink, including, for example, a downlink primary synchronization signal, a downlink secondary synchronization signal, and a demodulation reference signal of a physical broadcast channel.

The inter-base station measurement physical signals may also be transmitted on multiple frequency subbands. Wherein the transmitting of the inter-base station measurement physical signals on the plurality of frequency subbands may be transmitting the inter-base station measurement physical signals on different Bandwidth parts (BWPs), respectively; or respectively transmitting the physical signals measured by the inter-base station at different frequency positions of the system bandwidth at certain frequency intervals.

Fig. 5 shows an example in which the multi-frequency sub-bands transmit inter-base station measurement physical signals and the inter-base station measurement physical signals are time-domain periodic signals.

In a specific embodiment, the physical signals with the same index in the same period and sent on different subbands are sent on the same time domain resource, and the base station uses the same transmission beam in sending. Another specific implementation is that the physical signals with the same index in the same period sent on different subbands are sent on the same time domain resource, and the base station uses different transmission beams when sending.

An example of the inter-base station measurement physical signal in the time domain period transmitted in the multi-frequency sub-band may be a synchronization signal block transmitted by the interfering base station 3200 uplink and downlink on different BWPs or on pre-divided different frequency sub-bands, where the primary and secondary synchronization signals and the demodulation reference signal carried in the synchronization signal block may be used by the first base station to perform inter-base station interference measurement. Another example of the inter-bs measurement physical signal of the time domain period transmitted by the multi-frequency sub-band may be that the interfering bs 3200 repeatedly transmits a Channel state Information reference signal (CSI-RS) or an inter-bs measurement dedicated reference signal in the time domain period on a different BWP or on a pre-divided frequency sub-band, wherein the Channel state Information reference signal or the inter-bs measurement dedicated reference signal may be used by the first bs for inter-bs interference measurement. In the above two examples, the pre-divided frequency sub-band may also divide the system bandwidth or BWP equally into several frequency sub-bands at certain frequency intervals.

By transmitting the inter-base station measurement physical signal on a plurality of frequency subbands, the frequency selection characteristic of an inter-base station interference channel can be measured more effectively, and interference coordination can be performed more effectively.

In one example, the interfering base station 3200 sends periodic inter-base station measurement physical signals on multiple frequency subbands, and the interfering base station 3200 sends different copies multiple times using different transmit beams in the same period, the different transmit beams corresponding to different copy index values. Also, the interfering base station 3200 may make the transmission beams used to transmit copies of the same copy index value with different periods on the same frequency subband the same. Also, the interfering base station 3200 may make transmission beams used to transmit copies of the same period and the same copy index value on different frequency subbands the same, or transmission beams used to transmit copies of the same period and the same copy index value on different frequency subbands the different. In this way, the interfering base station can determine the transmission beam corresponding to the replica by the replica index value.

Returning to fig. 3, in step 313, the first base station 3100 performs interference measurement based on the received inter-base station measurement physical signal.

The specific method of step 313 comprises two steps (a) and (B):

step (A): the first base station 3100 obtains an average inter-base station interference signal strength for each frequency subband and each replica index value.

A specific method for the first base station 3100 to obtain the average inter-base station interference signal strength for each frequency subband and each replica index value may be that the first base station 3100 calculates the average received signal strength of the replica corresponding to each replica index value. The specific way for the first base station 3100 to count the average received signal strength of the replicas corresponding to each replica index value may be to average the received signal strengths of the replicas with the same index value in different periods.

More specifically, when the inter-base station measurement physical signal transmitted by the interfering base station 3200 is a periodic physical signal transmitted on a multi-frequency subband and multiple copies of the inter-base station measurement physical signal are repeatedly transmitted in the same period, a specific method for the first base station 3100 to perform interference measurement according to the inter-base station measurement physical signal transmitted by the interfering base station 3200 may be that the first base station 3100 calculates an average received signal strength of a copy corresponding to each copy index value on each frequency subband. In the above example, different replica index values for the replicas repeatedly transmitted in the same period may represent that the interfering base station 3200 transmits the replicas with the same complex-valued symbol using different transmit beams in the same period. I.e. the interference measured by the first base station 3100 is the average received signal strength of the copies transmitted using the different transmit beams.

Specifically, a specific embodiment in which the first base station 3100 obtains an average inter-base station interference signal strength will be described by taking an example of inter-base station measurement physical signals repeatedly transmitted over a plurality of frequency subbands in a plurality of time periods. Wherein, only transmitting one inter-base station measurement physical signal in the frequency domain can be regarded as a special case that the number of frequency subbands is 1. As shown in step 311, the interfering base station 3200 sends the time-periodic inter-base station measurement physical signal on a plurality of frequency subbands, the interfering base station 3200 repeatedly sends a plurality of copies of the inter-base station measurement physical signal multiple times using different transmission beams in the same period, different transmission beams correspond to different copy index values, and the interfering base station 3200 may make the transmission beams used for sending the copies of the same copy index value in different periods on the same frequency subband the same.

The first base station 3100 may measure the received signal strength of the replica of the physical signal between base stations of different periods and different replica index values on different frequency subbands as the inter-base station interference signal strength; and then, the interference signal intensity between the base stations in different periods but with the same frequency sub-band and the same copy index value is averaged to obtain the average interference signal intensity between the base stations under each frequency sub-band and each copy index value (emission beam).

Step (B): the first base station 3100 may process based on the average inter-base station interference signal strength for each frequency subband and each replica index value to generate an interference measurement report. The method for generating the interference measurement report may include the following four methods, including method one, method two, method three, and method four:

the first method is as follows: the first base station 3100 directly generates an interference measurement report based on the average inter-base station interference signal strength at each frequency subband and each replica index value obtained in step (a), as shown in table 1.

Table 1:

table 1: average inter-base station interference strength

Here, the first base station 3100 reports all the information of the measured average inter-base station interference signal strength per frequency subband and per replica index value, so that the OAM or interfering base station has more comprehensive information to make the decision how to perform interference coordination.

The second method comprises the following steps: the first base station 3100 compares the average inter-base station interference signal strengths of the different replica index values in the same frequency subband to obtain replica index values of M replicas, in each frequency subband, for which the average inter-base station interference signal strength is strongest, to obtain a correspondence between the frequency subband index and the replica index values of the M replicas, in the corresponding frequency subband, for which the interference signal strength is strongest. Specifically, for example, the first base station sorts the replica index values (respectively corresponding to different transmission beams of the interfering base station) in each frequency subband in descending order according to the magnitude of the average inter-base station interference signal strength, and obtains the corresponding relationship between the frequency subband index and the first M replica index values in the sorted replica index value sequence to generate the interference measurement report, as shown in table 2 (a-1). The value of M may be obtained by the first base station according to OAM configuration or may be a preset value. The determined M replica index values can be used by the interfering base station to determine the M transmit beams with the strongest interference.

TABLE 2(a-1)

Table 2 (a-1): corresponding relation between frequency sub-band index and copy index value of M copies with strongest interference signal intensity in corresponding frequency sub-band

Additionally, or alternatively, the first base station 3100 may obtain replica index values for M 'copies of the plurality of copies for which an average inter-base station interference signal strength is greater than a predetermined threshold per frequency subband to obtain correspondence of frequency subband indexes and replica index values for the M' copies to generate an interference measurement report, as shown in table 2 (a-2). The predetermined threshold may be obtained by the first base station according to OAM configuration or a system preset value. In one embodiment, the M' copies may be all the copies of the interference signal strength between the average base stations within each frequency sub-band measured by the first base station that is greater than a predetermined threshold. In another embodiment, the first base station may determine the M' copies based on X (where X is a positive integer) which may be obtained by the first base station according to the OAM configuration or is a system preset value. Specifically, M' is equal to the number of multiple copies whose average inter-base station interference signal strength is greater than a predetermined threshold within each frequency subband measured by the first base station, in the case where the number is less than or equal to X; in the case where the number is greater than X, M 'is equal to X, and the M' copies may be, for example, the first M 'copies with the largest interference strength among the plurality of copies with the average inter-base station interference signal strength greater than a predetermined threshold value within each frequency subband measured by the first base station, or may be, for example, any M' copies with the average inter-base station interference signal strength greater than the predetermined threshold value within each frequency subband measured by the first base station. That is, M' is equal to the smaller of the number of copies and X of which the average inter-base station interference signal strength within each frequency subband measured by the first base station is greater than the predetermined threshold. The determined replica index value can be used by the interfering base station to determine the transmit beams with interference strength exceeding a predetermined threshold.

TABLE 2(a-2)

Table 2 (a-2): m' copies of frequency subband index and corresponding frequency subband internal interference signal strength greater than predetermined threshold

The corresponding relation between the duplicate index values

The third method comprises the following steps: the first base station 3100 may generate the interference measurement report in such a manner that, in addition to the correspondence between the frequency subband index and the first M replica index values, the average interference signal strength measurement result corresponding to the replica index value in each frequency subband is added to generate the interference measurement report together, as shown in table 2 (b-1). In this way, the interfering base station 3200 can more clearly understand how strong the interference caused by the transmission beams corresponding to the M replica index values is, and perform appropriate interference coordination.

TABLE 2(b-1)

Table 2 (b-1): corresponding relation between frequency sub-band index and copy index values of M copies with strongest interference signal intensity in corresponding frequency sub-band and corresponding average interference intensity measurement result

Additionally, or alternatively, the first base station 3100 may generate the interference measurement report in a manner that, in addition to the correspondence between the frequency subband indexes and the M' replica index values, the average interference signal strength measurement result corresponding to the replica index value in each frequency subband is increased to generate the interference measurement report together, as shown in table 2 (b-2). In this way, the interfering base station 3200 can more clearly understand how strong the interference caused by the transmission beam corresponding to the replica index value is, and perform appropriate interference coordination.

TABLE 2(b-2)

Table 2 (b-2): corresponding relation between frequency sub-band index and copy index value of M' copies with interference signal intensity greater than predetermined threshold value in corresponding frequency sub-band and corresponding average interference intensity measurement result

The method is as follows: the first base station may generate the interference measurement report in a manner that, in addition to the correspondence between the frequency subband index and the first M index values, a transmit power reduction value when the interfering base station performs downlink transmission using the transmit beam corresponding to the duplicate index value in the frequency subband is increased to generate the interference measurement report together, as shown in table 2(c-1), where the transmit power reduction value means that when the interfering base station performs downlink transmission using the transmit beam corresponding to the indicated duplicate index value in the indicated frequency subband, the reduced transmit power should be used to reduce interference caused to uplink reception of the first base station. In this way, the interfering base station 3200 can more flexibly perform appropriate interference coordination for each interfering beam also based on the transmit power reduction value.

TABLE 2(c-1)

Table 2 (c-1): corresponding relation between frequency sub-band index and copy index values of M copies with strongest interference signal intensity in corresponding frequency sub-band and corresponding transmission power reduction value

Additionally or alternatively, the first base station may generate the interference measurement report in a manner that, in addition to the correspondence between the frequency subband index and the M' replica index values, the transmission power drop value of the interfering base station during downlink transmission using the transmission beam corresponding to the replica index value in the frequency subband is increased, and the interference measurement report is generated together, as shown in table 2 (c-2). In this way, the interfering base station 3200 is able to more flexibly perform appropriate interference coordination for each interfering beam also based on the transmit power reduction value.

TABLE 2(c-2)

Table 2 (c-2): corresponding relation between frequency sub-band index and copy index value and corresponding emission power reduction value of M' copies with interference signal intensity greater than predetermined threshold value in corresponding frequency sub-band

Step 210 of FIG. 2 is described in more detail above by steps 303-313 and may be included in step 210.

In step 315, the first base station 3100 reports the interference measurement report, where the reporting object is the interfering base station 3200 or the management center. Specifically, the way for reporting the interference measurement result by the first base station 3100 may be that the first base station 3100 reports the interference measurement result to OAM through a backhaul link; or, the first base station 3100 reports the interference measurement result to the interfering base station 3200 through the access link.

The way for reporting the interference measurement report by the first base station 3100 may be that the first base station 3100 accesses an interfering cell, and reports the interference measurement of the interfering base station in the interfering cell to the first base station 3100 to the interfering base station 3200 through an access link.

The specific method for reporting the inter-base station interference measurement to the interfering base station 3200 by the first base station 3100 through the access link may be that the first base station 3100 accesses an interfering cell and reports an interference measurement report to the interfering base station 3200 in a random access process. More specifically, the first base station 3100 may be carried in a random access procedure Msg 3; or uplink shared channel carrying in a two-step random access procedure MsgA.

Or, the specific method for reporting the inter-base station interference measurement to the interfering base station by the first base station 3100 through the access link may be that the first base station 3100 accesses the interfering cell, and reports the inter-base station interference measurement result on the semi-persistently scheduled physical resource configured to the first base station 3100 by the interfering base station. In this way, the first base station 3100 can report the interference measurement result to the interfering base station 3200 more promptly and quickly.

Step 220 of fig. 2 is set forth in greater detail above via step 315.

In step 317, the interfering base station 3200 performs beam-based interference coordination according to the interference measurement result.

The interfering base station 3200 determines a transmit beam, which may also be referred to as an "interfering beam" hereinafter, corresponding to the reported replica index value based on the interference measurement result reported by the first base station 3100. Additionally, the interfering base station 3200 may also determine a transmit power reduction value corresponding to the interfering beam based on the interference measurement reported by the first base station 3100. Additionally, the interfering base station 3200 may also determine an average interference strength measurement corresponding to the interfering beam based on the interference measurements reported by the first base station 3100.

One beam-based inter-base station interference coordination scheme is for the interfering base station 3200 to perform downlink transmission without using interfering beams that generate large inter-base station interference. The manner of the interference base station 3200 obtaining the interference beam generating the larger inter-base station interference may be an interference beam corresponding to a duplicate index value of which inter-base station interference energy is greater than a threshold in an interference measurement report, or an interference beam corresponding to a duplicate index value indicated by OAM. The threshold may be obtained by the interfering base station according to OAM configuration or may be a preset value of the interfering base station. In this case, the interference of the interfering beam to the first base station 3100 may be minimized.

Or when the interfering base station 3200 uses an interfering beam generating a larger inter-base station interference to perform downlink transmission, performing downlink transmission according to the transmission power reduction value corresponding to the interfering beam reported by the first base station 3100. The method for the interfering base station to obtain the interfering beam generating the larger inter-base station interference may be an interfering beam corresponding to a duplicate index value in which the inter-base station interference energy is greater than a threshold in an interference measurement report, or an interfering beam corresponding to a duplicate index value indicated by OAM. The threshold may be obtained by the interfering base station according to OAM configuration or may be a preset value of the interfering base station. In this case, the interference beam can be transmitted with reduced transmission power, and the degree of freedom for the interfering base station to schedule the transmission of the interference beam can be ensured while the interference of the interference beam is properly reduced.

As a specific example, let us say that the transmission beam used for downlink transmission of the interfering base station 3200 is { 1., N_TXThe index value of the sub-band in frequency reported by the first base station is i_FThe index of the transmitting beam corresponding to the index value of the copy with the maximum interference between the base stations on the frequency sub-band is recorded as i_TX(i_F) Then for inter-base station interference coordination purposes, the interfering base station has an index i in the frequency subband _FShould avoid using the transmission beam index of i for downlink transmission on the frequency sub-band_TX(i_F) The usable transmit beam index of i e {1_TXAnd i ≠ i_TX(i_F) (ii) a Several interference base stations determine interference wave beams and the transmission power reduction values corresponding to the interference wave beams, and the frequency sub-band index reported by the first base station is assumed to be i_FThe index of the transmitting beam corresponding to the index value of the copy with the maximum interference between the base stations on the frequency sub-band is recorded as i_TX(i_F) And corresponding to the transmission beam i causing interference between base stations of neighboring cells_TX(i_F) Is recorded as Δ P (i)_TX(i_F) When the interfering base station has an index i in the frequency subband_FUsing a transmit beam index of i on a frequency subband_TX(i_F) When the transmitting wave beam carries out downlink transmission, the maximum downlink transmitting power is P_max-ΔP(i_TX(i_F) In which P) is_maxTransmitting maximum power for downlink of the interfering base station; when the interference base station has a frequency subband index of i_FUsing a transmit beam index of i e {1_TXAnd i ≠ i_TX(i_F) When the transmitting wave beam carries out downlink transmission, the maximum downlink transmitting power is P_max. The design can ensure that the interference base station flexibly reduces the transmission power by using the transmission power reduction value when using the transmission beam which causes stronger interference to the first base station so as to reduce the interference to the first base station of the adjacent cell.

Another beam-based inter-base station interference coordination scheme is characterized in that the interfering base station does not use the interfering beam for downlink transmission on a specific time domain and/or frequency domain resource (i.e., time-frequency resource), and the interfering base station may use all downlink transmission beams including the interfering beam for downlink transmission on the unspecified time domain and/or frequency domain resource. The specific time domain and/or frequency domain resource may be a physical resource configured by OAM for inter-base station interference coordination; or the physical resource for performing inter-base station interference coordination is obtained by the interference base station according to a preset rule, for example, the preset rule may be that a fixed band in the system bandwidth is used as a frequency domain resource for inter-base station interference coordination, or that time domain symbols in a plurality of fixed subframes/time slots are used as a time domain resource for inter-base station interference coordination, or that a combination of the frequency domain resource and the time domain resource is used. By the method, the interference coordination between the base stations can be carried out only on the specific time-frequency domain resource according to the requirement, so that the degree of freedom of the interference base station for scheduling the interference wave beam transmission on other non-specific time-frequency resources is ensured.

Another interference coordination scheme between base stations based on beams is characterized in that, on specific time domain and/or frequency domain resources, when an interfering base station uses an interfering beam to perform downlink transmission, downlink transmission is performed according to a transmission power reduction value corresponding to the interfering beam; on a specific time domain and/or frequency domain resource, when the interference base station uses other transmitting beams except the interference beam for downlink transmission, normal transmitting power (without the aforementioned transmitting power reduction) is used for downlink transmission; on the non-specific time domain and/or frequency domain resource, when the interfering base station uses all the beams including the interfering beam to perform downlink transmission, the interfering base station uses normal transmission power (without performing the aforementioned transmission power reduction) to perform downlink transmission. The specific time domain and/or frequency domain resource may be a physical resource configured by OAM for inter-base station interference coordination; or the physical resource for performing inter-base station interference coordination acquired by the interfering base station according to a preset rule, for example, the preset rule may be that a fixed band in the system bandwidth is used as a frequency domain resource for inter-base station interference coordination, or may be that time domain symbols in a plurality of fixed subframes/time slots are used as a time domain resource for inter-base station interference coordination, or may be a combination of the frequency domain resource and the time domain resource. By the method, when interference coordination is carried out on the specific time-frequency domain resource, the sending power can be more flexibly and properly reduced to reduce the interference on the first base station, and meanwhile, the degree of freedom of the interference base station for scheduling interference wave beam transmission on the specific time-frequency domain resource can be ensured; the degree of freedom of the interfering base station in scheduling the interference beam transmission on other non-specific time-frequency resources is not affected by the implementation of the interference coordination scheme.

Through the various beam-based inter-base station interference coordination schemes described above, not only can the interference of the interfering base station on the first base station be reduced, but also the interference of the interfering base station on other base stations subjected to inter-base station cross link interference caused by the interfering beam can be reduced.

Step 230 of fig. 2 is set forth in more detail above by step 317, i.e., step 317 may be included in step 230.

The method shown in fig. 1 in the presence of OAM will be described in more detail below in connection with fig. 6. Fig. 6 is a flowchart 6000 illustrating an interference coordination method jointly performed by the first base station 6100, the interfering base station 6200, and the OAM 6300 according to an embodiment of the present disclosure. The interference coordination method shown in fig. 6 is, for example, a beam-based interference coordination method. Wherein, the interfering bs 6200 of the first bs 6100 may be one or more. The following description is provided by taking the single interfering bs 6200 as an example. When the number of the interference base stations is multiple, the steps described in the method can be repeatedly and sequentially executed, and the inter-cell interference measurement can be sequentially performed on the multiple interference base stations.

Steps

601, 603, 605, 607, 609, 611, 613 are the same as

steps

301, 303, 305, 307, 309, 311, 313, and are not described herein again.

In step 615, the first base station reports an interference measurement report. The first base station may report the inter-base station interference measurement report to the OAM 6300 through the backhaul link.

In step 617, the OAM determines an interference coordination configuration based on the interference measurement report reported by the first base station.

The method for determining the interference coordination configuration by OAM may be one of the following two methods:

mode 1:

and under the condition that the interference measurement report reported by the first base station only comprises the average inter-base station interference signal strength of each frequency subband and each replica index value, performing interference coordination configuration in the mode 1. The following is divided into three cases discussion mode 1:

mode 1-1:

and the OAM compares the average inter-base station interference signal strength of different replica index values in the same frequency sub-band to obtain the replica index values of M replicas with the strongest average inter-base station interference signal strength in each frequency sub-band. For example, the OAM sorts the replica index values (respectively corresponding to different transmission beams of the interfering base stations) in each frequency subband in descending order according to the magnitude of the average inter-base station interference signal strength, so as to obtain the corresponding relationship between the frequency subband index and the first M index values in the sorted replica index value sequence, so as to generate the interference coordination configuration, as shown in table 2 (a-1). Wherein, the value of M can be configured by OAM or be a preset value.

Additionally, or alternatively, the OAM may obtain replica index values of M 'copies of the multiple copies in each frequency subband whose average inter-base station interference signal strength is greater than a predetermined threshold, obtain a correspondence of the frequency subband index and the replica index values of the M' copies whose average inter-base station interference signal strength is greater than a predetermined threshold, to generate the interference coordination configuration, as shown in table 2 (a-2). The predetermined threshold may be an OAM internal parameter or a system preset value. In one embodiment, the M' copies may be all copies of the average inter-base station interference signal strength within each frequency subband greater than a predetermined threshold. In another embodiment, OAM may determine the M' copies based on X (where X is a positive integer), which may be an OAM internal parameter or a value preset for the system. Specifically, in the case where the number of the plurality of copies whose average inter-base station interference signal strength is larger than the predetermined threshold value within each frequency subband is smaller than or equal to X, M' is equal to the number; in the case where the number is greater than X, M 'is equal to X, and the M' copies may be, for example, the first M 'copies having the largest interference strength among the plurality of copies having the average inter-base station interference signal strength greater than the predetermined threshold value within each frequency subband, or may be, for example, any M' copies having the average inter-base station interference signal strength greater than the predetermined threshold value within each frequency subband. That is, M' is equal to the smaller of the number of copies and X of the plurality of copies in each frequency subband whose average inter-base station interference signal strength is greater than the predetermined threshold.

Mode 1 to 2:

in addition to the correspondence between the frequency subband index and the first M index values, the OAM adds the average interference signal strength measurement result corresponding to the replica index value in each frequency subband to jointly generate an interference coordination configuration, as shown in table 2 (b-1).

Additionally, or alternatively, in addition to the correspondence of frequency subband indices to replica index values of the M' replicas, the OAM adds an average interference signal strength measurement corresponding to the replica index values within each frequency subband, collectively generating an interference coordination configuration, as shown in table 2 (b-2).

Modes 1 to 3:

besides the correspondence between the frequency subband index and the first M index values, the OAM adds a transmission power reduction value when the interfering base station uses the transmission beam corresponding to the replica index value to perform downlink transmission in the frequency subband, and generates an interference coordination configuration together, as shown in table 2 (c-1). The meaning of the transmission power reduction value is that when the interfering base station uses the transmission beam corresponding to the indicated replica index value to perform downlink transmission in the indicated frequency sub-band, the reduced transmission power should be used to reduce the interference caused to the uplink reception of the first base station.

Additionally or alternatively, in addition to the correspondence between the frequency subband index and the duplicate index values of the M' duplicates, the OAM adds a transmission power reduction value when the interfering base station performs downlink transmission using a transmission beam corresponding to the duplicate index value in the frequency subband, to collectively generate an interference coordination configuration, as shown in table 2 (c-2). .

Mode 2: when the interference measurement report reported by the first base station is a measurement result as shown in table 2(a-1), table 2(a-2), table 2(b-1), table 2(b-2), table 2(c-1) or table 2(c-2), the OAM directly generates an interference coordination configuration based on the interference measurement report.

In step 619, the OAM sends the interference coordination configuration to the interfering base station.

In step 621, the interfering base station performs interference coordination based on the received interference coordination configuration. Specifically, the interfering base station determines a transmission beam corresponding to a duplicate index value indicated by the interference coordination configuration, hereinafter referred to as "interfering beam", based on the interference coordination configuration received from the OAM. Additionally, the interfering base station may also determine a transmit power reduction value corresponding to the interfering beam based on the interference coordination configuration. Additionally, the interfering base station may also determine an average interference strength measurement corresponding to the interfering beam based on the interference coordination configuration. Next, the interference base station performs interference coordination based on the interference beam in the same specific manner as that of the interference base station performing interference coordination based on the interference beam in step 317, and details are not repeated here.

A method for frequency-domain based inter-base station interference coordination is described below, which can be used in conjunction with or independent of the interference coordination method described above. For example, the method for inter-base station interference coordination in the frequency domain in this embodiment may be implemented before step 200 of fig. 2, may also be implemented after step 230 of fig. 2, or may be implemented simultaneously with or between any one or more steps of fig. 2. The interference coordination method in this embodiment is implemented by the first base station and/or the interfering base station together.

In the method for coordinating interference between base stations based on frequency domain in this embodiment, a base station acquires a bandwidth position of full duplex transmission according to OAM configuration or a Cell ID of a local Cell, where a full duplex transmission bandwidth of a first base station (the local Cell) and a full duplex transmission bandwidth of an interfering base station (an interfering Cell) are not overlapped (as shown in fig. 7) or not overlapped completely (not shown). The design can ensure that the base station only receives the interference of the downlink transmission of the interference base station on part of the time frequency resources in the full duplex transmission bandwidth (the interference between the base stations is not generated on the time frequency resources of the uplink transmission of the interference base station).

Fig. 7 shows a schematic diagram, in which cell #0, cell #1, and cell #2 are interfering base stations with each other. Wherein the full duplex bandwidths or bandwidth portions of cell #0, cell #1, and cell #2 do not overlap. Taking the cell #1 as an example, through the frequency domain interference coordination scheme, the inter-base station interference on the full duplex bandwidth or bandwidth part of the base station in the cell #1 only occurs on the time domain or frequency domain resource for downlink transmission in the non-full duplex between the cell #0 and the cell #2, so that the inter-base station interference of the adjacent cell of the target cell on the full duplex bandwidth or bandwidth part can be effectively reduced, and the spectrum efficiency of full duplex transmission can be effectively improved.

A specific implementation manner of the frequency domain interference coordination method is that each base station obtains configuration of a full duplex bandwidth or a bandwidth part in a system bandwidth through OAM, and the configuration meaning of the full duplex bandwidth or the bandwidth part at least includes one of the following: a size of a full duplex bandwidth or bandwidth portion, a starting sub-carrier frequency or a center frequency of the full duplex bandwidth or bandwidth portion. Before the step of obtaining, by the base station, the configuration of the full duplex bandwidth or the bandwidth portion in the system bandwidth through OAM, a step may also be included in which a first base station reports an OAM inter-base station interference measurement report through a backhaul link, where the first base station is one or more base stations that are subject to interference between base stations of neighboring cells in all cells managed by OAM. In all cells managed by the OAM, there may be a case where the same base station is an interfering base station and an interfered base station (a first base station) at the same time, so that the OAM may uniformly perform frequency domain coordination management after collecting interference measurement reports between base stations of all first base stations in the managed cell.

Another specific implementation manner of the frequency domain interference coordination method is that each base station may calculate a frequency domain position of a full-duplex bandwidth or a bandwidth part in a system bandwidth according to a Cell ID of the Cell. Specifically, before calculating the frequency domain position of the full-duplex bandwidth or the bandwidth part in the system bandwidth according to the Cell ID, the base station may further obtain a related parameter calculated by the frequency domain position of the full-duplex bandwidth or the bandwidth part through OAM or a preset manner, where the configuration parameter may be the size of the full-duplex bandwidth or the bandwidth part and/or a coordination multiplexing factor N, where the coordination multiplexing factor N means a maximum number of cells that can ensure that the full-duplex bandwidth or the bandwidth part do not overlap with each other.

The base station calculates the related parameters according to the Cell ID and the frequency domain position of the full-duplex bandwidth or the bandwidth part configured by the OAM, and a specific embodiment may be that, for a Cell ID of N_CIDThe starting position of the full duplex bandwidth or the bandwidth part in the system bandwidth is (i)_N-1) B/N, where B represents the system bandwidth and the unit thereof can be the number of physical resource blocks, or subcarriers, or bandwidth part, N represents the coordination multiplexing factor, i_N＝N_CIDmod N. Then for a base station with Cell ID NCID, the frequency domain range of the full-duplex bandwidth or bandwidth portion in the system is [ (i)_N1)·B/N，(i_N1)·B/N+B_FD]In which B is_FDRepresenting full duplex bandwidth in the same units as system bandwidth B. Fig. 8 is a schematic diagram showing the implementation effect of the embodiment, wherein the coordination multiplexing factor size is set to be N-3, and the Cell ID is set to be N _CID1 as shown in fig. 8. As such, the frequency domain location of a particular full-duplex bandwidth or bandwidth portion may be calculated based on particular parameters such that the full-duplex bandwidth or bandwidth portions do not overlap or less overlap with each other.

The above describes a specific method of inter-base station interference coordination.

Fig. 9 is a schematic diagram showing the structure of the first base station 900.

In fig. 9, a first base station 900 includes a transceiver 910 and a processor 920.

The transceiver 910 may transmit and receive uplink and/or downlink wireless signals in a wireless communication network for communication with a base station or other terminals. Processor 920 may generate signals to be transmitted by transceiver 910, interpret signals received by transceiver 910, or control the operation of transceiver 910. The processor 920 may perform the inter-base station interference coordination method in all embodiments in the present disclosure. For example, the processor 920 may control the transceiver 910 to receive a physical signal transmitted by an interfering base station and to perform interference measurement based on the received physical signal; and controlling the transceiver 910 to report the interference measurement result to the interfering base station or the management center, so that the interfering base station performs interference coordination at least for the first base station based on the interference measurement result reported by the first base station 900 or the configuration of the management center.

Fig. 10 is a schematic diagram showing the structure of the interfering base station 1000.

In fig. 10, interfering base station 1000 includes a transceiver 1010 and a processor 1020.

The transceiver 1010 may transmit and receive uplink and/or downlink wireless signals in a wireless communication network for communication with a base station or other terminals. Processor 1020 may generate signals to be transmitted by transceiver 1010, interpret signals received by transceiver 1010, or control the operation of transceiver 1010. The processor 1020 may perform the inter-base station interference coordination method in all embodiments in this disclosure. For example, the processor 1020 may control the transceiver 1010 to transmit a physical signal to the first base station, so that the first base station performs interference measurement based on the physical signal transmitted by the interfering base station 1000 and reports the interference measurement result to the interfering base station 1000 or a management center; and performing interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

Fig. 11 illustrates an inter-base station interference coordination methodology 1100 performed by a first base station 900.

In step 1110, the first base station 900 receives a physical signal transmitted by the interfering base station 1000 and performs interference measurement based on the received physical signal.

In step 1120, the first base station 900 reports the interference measurement result to the interfering base station 1000 or the management center 110, so that the interfering base station 1000 performs interference coordination at least for the first base station 900 according to the interference measurement result reported by the first base station 900 or the configuration of the management center 110.

Fig. 12 illustrates an inter-base station interference coordination method 1200 performed by the interfering base station 1000.

In step 1210, the interfering base station 1000 transmits a physical signal to the first base station 900, so that the first base station 900 performs interference measurement based on the physical signal transmitted by the interfering base station 1000 and reports the interference measurement result to the interfering base station 1000 or the management center 110.

In step 1220, the interfering base station 1000 performs interference coordination at least for the first base station 900 according to the interference measurement result reported by the first base station 900 or the configuration of the management center 110.

Fig. 13 is a diagram 1300 illustrating an inter-base station interference coordination method according to an embodiment of the disclosure, which further details the method shown in fig. 11.

In step 1310, the first base station determines that the uplink received interference energy is too high. Step 1310 corresponds to step 301 of fig. 3, and to step 601 of fig. 6.

In step 1320, the first base station receives a physical signal transmitted by an interfering base station, the physical signal including an inter-base station measurement physical signal transmitted on one or more frequency subbands, and wherein the inter-base station measurement physical signal is repeatedly transmitted on each frequency subband in a plurality of transmission periods, and wherein at least two copies of the inter-base station measurement physical signal having different copy indexes are repeatedly transmitted on each frequency subband in the same transmission period. The method for the base station to measure the repeated transmission of the multiple copies with different copy indexes of the physical signal on each frequency subband in the same transmission period at least comprises one of the following steps: the interference base station transmits at least two copies of the same complex value symbol by different analog transmission beams; the interference base station sends at least two copies of the same complex-valued symbol by different digital transmission beams; or the interfering base station transmits at least two copies of the same complex-valued symbol in the same analog transmit beam and the same digital transmit beam. Step 1320 corresponds to step 311 of fig. 3, and to step 611 of fig. 6.

In step 1330, the first base station averages the inter-base station interference signal strengths of the copies of the same copy index for different transmission periods to obtain an average inter-base station interference signal strength for each frequency subband and each copy index.

In step 1340, the first base station obtains at least one of the following as an interference measurement: the method comprises the steps of aiming at each frequency subband and the average inter-base station interference signal strength of each copy index, the copy indexes of M copies with the strongest average inter-base station interference signal strength in each frequency subband, the average inter-base station interference signal strength of the M copies in each frequency subband, and a transmission power reduction value when an interference base station performs downlink transmission by using a transmission beam corresponding to the M copies in each frequency subband, wherein M is a positive integer, and is configured by a management center or is a system preset value. Or the first base station obtains at least one of the following as an interference measurement: the average inter-base station interference signal strength for each frequency subband and each replica index, replica indexes of M ' replicas of a plurality of replicas, of which the average inter-base station interference signal strength within each frequency subband is greater than a predetermined threshold, average inter-base station interference signal strengths of the M ' replicas within each frequency subband, and a transmission power drop value when an interfering base station performs downlink transmission using a transmission beam corresponding to the M ' replicas within each frequency subband, wherein M ' is a positive integer and M ' is ≦ X. Where X is a positive integer and is configured by the management center or is a system predetermined value.

Steps

1330 and 1340 correspond to step 313 of fig. 3 and to step 613 of fig. 6.

In step 1350, the first base station determines whether to report the interference measurement result to the management center or the interfering base station. When the first base station determines to report to the management center, the method 1300 proceeds to step 1370, and when the first base station determines to report to the interfering base station, the method 1300 proceeds to step 1360.

In step 1360, the first base station accesses the cell to which the interfering base station belongs, and reports the interference measurement result to the interfering base station through the access link, including: the first base station carries the interference measurement result in the random access process Msg3 of the cell to which the interfering base station belongs, or the first base station carries the interference measurement result in the uplink shared channel in the two-step random access process MsgA of the cell to which the interfering base station belongs, or the first base station reports the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the interfering base station. Step 1360 corresponds to step 315 of FIG. 3.

In step 1370, the management center obtains, from the interference measurement result reported by the first base station, at least one of the following configurations as the management center: the method comprises the steps of averaging inter-base station interference signal strength of each frequency subband and each replica index, replica indexes of M replicas with the average inter-base station interference signal strength larger than a preset threshold value or the average inter-base station interference signal strength being strongest within each frequency subband, averaging inter-base station interference signal strength of the M replicas within each frequency subband, and a transmission power reduction value when an interference base station performs downlink transmission by using a transmission beam corresponding to the M replicas within each frequency subband, wherein M is a positive integer. Or the management center obtains at least one of the following configurations as the management center from the interference measurement result reported by the first base station: the average inter-base station interference signal strength for each frequency subband and each replica index, the replica indexes of the M ' replicas with the average inter-base station interference signal strength greater than a predetermined threshold within each frequency subband, the average inter-base station interference signal strength of the M ' replicas within each frequency subband, and a transmission power drop value when an interfering base station performs downlink transmission using a transmission beam corresponding to the M ' replicas within each frequency subband, where M is a positive integer, so that the size of M is adjustable based on the predetermined threshold and X. Then, the management center sends the configuration of the management center to the interfering base station. Step 1370 corresponds to step 617 of FIG. 6.

In step 1380, the interfering bs determines a transmitting beam corresponding to the interference measurement result reported by the first bs or the configuration of the management center; and performing the following steps for K transmit beams among the determined transmit beams: the interference base station does not use the K transmitting beams to carry out downlink transmission in all time frequency resources or specific time frequency resources of the system; or the interference base station further determines the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performs downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams; wherein K is a positive integer and K ≦ M ≦ the number of frequency subbands when the determined transmit beam is determined from the interference measurements reported by the first base station, and K ≦ M' the number of frequency subbands when the determined transmit beam is determined from the configuration of the management center. Wherein the specific time-frequency resource comprises one of the following: time frequency resources which are configured by the management center and used for interference coordination; or the interference base station acquires the time-frequency resource for interference coordination according to a preset rule, wherein the preset rule comprises: taking a fixed section of frequency band in a system bandwidth as a frequency domain resource for interference coordination; taking a fixed single subframe or a fixed time slot or a time domain symbol in the time slot as a time domain resource for interference coordination; a combination of the above frequency domain resources and time domain resources. Step 1380 corresponds to step 317 of fig. 3 and to step 621 of fig. 6.

At step 1390, at least one of the first base station and the interfering base station configures a full duplex bandwidth or a portion of the bandwidth within the system bandwidth, wherein the full duplex bandwidth of the first base station and the interfering base station do not overlap or do not completely overlap. Specifically, at least one of the first base station and the interfering base station determines a starting position and a frequency domain range of a full duplex bandwidth or a bandwidth portion of the at least one of the first base station and the interfering base station based on at least one of a system bandwidth, the full duplex bandwidth, a coordinated multiplexing factor, and a cell identifier of the at least one of the first base station and the interfering base station. Although step 1390 is shown in fig. 13 as being performed after step 1380, step 1390 may be performed concurrently with any of the other steps of fig. 13, between any two of the other steps of fig. 13, independently of any of the other steps of fig. 13, or omitted.

Steps

1310, 1320, 1330, 1340 may be applied to step 1110 of fig. 11,

steps

1350, 1360, 1370, 1380 may be applied to step 1120 of fig. 11, and step 1390 may be applied to either of

steps

1110 and 1120 of fig. 11, and may also be performed before step 1110, or after step 1120, or at

steps

1110 and 1120, or independently of

steps

1110 and 1120.

Fig. 14 is a diagram 1400 of an inter-base station interference coordination method according to an embodiment of the disclosure, which further illustrates the method shown in fig. 12 in detail.

In step 1410, the first base station determines that the uplink received interference energy is too high. Step 1410 corresponds to step 301 of fig. 3, and to step 601 of fig. 6.

In step 1420, the interfering base station transmits a physical signal to the first base station, the physical signal including an inter-base station measurement physical signal, the inter-base station measurement physical signal being transmitted on one or more frequency subbands, and wherein the inter-base station measurement physical signal is repeatedly transmitted on each frequency subband in a plurality of transmission periods, and wherein at least two copies of the inter-base station measurement physical signal having different copy indexes are repeatedly transmitted on each frequency subband in the same transmission period. The method for measuring the repeated transmission of the multiple copies with different copy indexes of the physical signal on each frequency subband in the same transmission period by the base station at least comprises one of the following steps: the interference base station sends at least two copies of the same complex value symbol by different analog transmitting beams; the interference base station sends at least two copies of the same complex-valued symbol by different digital transmission beams; or the interfering base station transmits at least two copies of the same complex-valued symbol in the same analog transmit beam and the same digital transmit beam. Step 1420 corresponds to step 311 of fig. 3, and to step 611 of fig. 6.

In step 1430, the first base station averages the inter-base station interference signal strengths of the copies of the same copy index for different transmission periods to obtain an average inter-base station interference signal strength for each frequency subband and each copy index.

In step 1440, the first base station obtains at least one of the following as an interference measurement: the method comprises the steps of aiming at each frequency subband and the average inter-base station interference signal strength of each copy index, the copy indexes of M copies with the strongest average inter-base station interference signal strength in each frequency subband, the average inter-base station interference signal strength of the M copies in each frequency subband, and a transmission power reduction value when an interference base station performs downlink transmission by using a transmission beam corresponding to the M copies in each frequency subband, wherein M is a positive integer, and is configured by a management center or is a system preset value. Or the first base station obtains at least one of the following as an interference measurement: the average inter-base station interference signal strength for each frequency subband and each replica index, replica indexes of M ' replicas of a plurality of replicas, for which the average inter-base station interference signal strength within each frequency subband is greater than a predetermined threshold, average inter-base station interference signal strengths of the M ' replicas within each frequency subband, and a transmission power drop value when an interfering base station performs downlink transmission using a transmission beam corresponding to the M ' replicas within each frequency subband, wherein M ' is a positive integer, and M ' is ≦ X, wherein X is a positive integer and is configured by a management center or is a system predetermined value. As such, the size of M is adjustable based on the predetermined threshold and X.

Steps

1430 and 1440 correspond to step 313 of fig. 3 and to step 613 of fig. 6.

In step 1450, the interfering base station determines whether to obtain information on the interference measurement result from the management center or the interfering base station. When the interfering base station determines to obtain information on the interference measurement result from the management center, the method 1400 proceeds to step 1470, and when the interfering base station determines to obtain information on the interference measurement result from the interfering base station, the method 1400 proceeds to step 1460.

In step 1460, the interfering base station receives an interference measurement from the first base station via the access link, comprising: the interference base station obtains the interference measurement result through a random access process Msg3 of the cell to which the first base station and the interference base station belong, or the interference base station obtains the interference measurement result through an uplink shared channel in a two-step random access process MsgA of the cell to which the first base station and the interference base station belong, or the interference base station obtains the interference measurement result on a semi-persistent scheduling physical resource configured to the first base station by the interference base station. Step 1460 may correspond to step 315 of fig. 3.

In step 1470, the management center obtains, from the interference measurement result reported by the first base station, at least one of the following configurations as the management center: the method comprises the steps of averaging inter-base station interference signal strength of each frequency subband and each replica index, replica indexes of M replicas with the average inter-base station interference signal strength larger than a preset threshold value or the average inter-base station interference signal strength being strongest within each frequency subband, averaging inter-base station interference signal strength of the M replicas within each frequency subband, and a transmission power reduction value when an interference base station performs downlink transmission by using a transmission beam corresponding to the M replicas within each frequency subband, wherein M is a positive integer. Or the management center obtains at least one of the following configurations as the management center from the interference measurement result reported by the first base station: the method comprises the steps of averaging inter-base station interference signal strength for each frequency sub-band and each replica index, replica indexes of M ' replicas among a plurality of replicas with average inter-base station interference signal strength within each frequency sub-band being greater than a predetermined threshold, averaging inter-base station interference signal strength of the M ' replicas within each frequency sub-band, and a transmission power drop value when an interfering base station performs downlink transmission using a transmission beam corresponding to the M ' replicas within each frequency sub-band, wherein M ' is a positive integer and M ' is less than X, wherein X is a positive integer and is configured by a management center or is a system predetermined value. As such, the size of M' is adjustable based on the predetermined threshold and X. Then, the management center sends the configuration of the management center to the interfering base station. Step 1470 may correspond to step 617 of FIG. 6.

In step 1480, the interfering base station determines a transmission beam corresponding to the interference measurement result reported by the first base station or the configuration of the management center; and performing the following steps for K transmit beams among the determined transmit beams: the interference base station does not use the K transmitting beams to carry out downlink transmission in all time frequency resources or specific time frequency resources of the system; or the interference base station further determines the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performs downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams; wherein K is a positive integer and K ≦ M ≦ the number of frequency subbands when the determined transmit beam is determined from the interference measurements reported by the first base station, and K ≦ M' [ the number of frequency subbands ] when the determined transmit beam is determined from the configuration of the management center. Wherein the specific time-frequency resource comprises one of the following: time frequency resources which are configured by the management center and used for interference coordination; or the interference base station acquires the time-frequency resource for interference coordination according to a preset rule, wherein the preset rule comprises: taking a fixed section of frequency band in the system bandwidth as a frequency domain resource for interference coordination; taking a fixed single subframe or time slot or a time domain symbol in the time slot as a time domain resource for interference coordination; a combination of the above frequency domain resources and time domain resources. Step 1480 corresponds to step 317 of fig. 3 and corresponds to step 621 of fig. 6.

At step 1490, at least one of the first base station and the interfering base station configures a full duplex bandwidth or a bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or the bandwidth portion of the first base station and the interfering base station do not overlap or do not completely overlap. Specifically, at least one of the first base station and the interfering base station determines a starting position and a frequency domain range of a full duplex bandwidth or a bandwidth portion of the at least one of the first base station and the interfering base station based on at least one of a system bandwidth, the full duplex bandwidth, a coordinated multiplexing factor, and a cell identifier of the at least one of the first base station and the interfering base station. Although step 1490 is shown in fig. 14 as being performed after step 1480, step 1490 may be performed concurrently with any of the other steps of fig. 14, between any of the other two steps of fig. 14, independently of any of the other steps of fig. 14, or omitted.

Steps

1410, 1420, 1430, 1440 may be applied to step 1210 of fig. 12,

steps

1450, 1460, 1470, 1480 may be applied to step 1120 of fig. 12, and step 1490 may be applied to either of

steps

1210 and 1220 of fig. 12, and may be performed before step 1210, or after step 1220, or between

steps

1210 and 1220, or independently of

steps

1210 and 1220.

Various embodiments of the present disclosure may be implemented as computer readable code embodied on a computer readable recording medium from a particular perspective. The computer readable recording medium is any data storage device that can store data readable by a computer system. Examples of the computer readable recording medium may include read-only memory (ROM), random-access memory (RAM), compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, optical data storage device, carrier wave (e.g., data transmission via the internet), and so on. The computer-readable recording medium can be distributed over network-connected computer systems and thus the computer-readable code can be stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for implementing various embodiments of the present disclosure may be easily construed by those skilled in the art to which the embodiments of the present disclosure are applied.

It will be understood that embodiments of the present disclosure may be implemented in hardware, software, or a combination of hardware and software. The software may be stored as program instructions or computer readable code executable on a processor on a non-transitory computer readable medium. Examples of the non-transitory computer readable recording medium include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.) and optical recording media (e.g., CD-ROMs, Digital Video Disks (DVDs), etc.). The non-transitory computer-readable recording medium can also be distributed over network-coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion. The medium may be read by a computer, stored in a memory, and executed by a processor. The various embodiments may be implemented by a computer or a portable terminal including a controller and a memory, and the memory may be an example of a non-transitory computer-readable recording medium adapted to store program(s) having instructions to implement the embodiments of the present disclosure. The present disclosure may be realized by a program having codes for embodying the apparatus and method described in the claims, the program being stored in a machine (or computer) readable storage medium. The program may be electronically carried on any medium, such as a communication signal conveyed via a wired or wireless connection, and the disclosure suitably includes equivalents thereof.

Claims

1. An inter-base station interference coordination method includes:

the first base station receiving a physical signal transmitted by the second base station and performing interference measurement based on the received physical signal;

the first base station reports the interference measurement result to the second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

2. The method of claim 1, wherein the physical signals comprise inter-base station measurement physical signals, the inter-base station measurement physical signals being transmitted on one or more frequency subbands, and,

wherein the inter-base station measurement physical signal is repeatedly transmitted on each frequency subband in a plurality of transmission periods, and,

wherein at least two copies of the inter-base station measurement physical signal having different copy indexes are repeatedly transmitted on each frequency subband within the same transmission period.

3. The method of claim 2, wherein the first base station receiving a physical signal transmitted by the second base station and making interference measurements based on the received physical signal comprises:

the first base station averages the inter-base station interference signal strengths of the copies of the same copy index in different transmission periods to obtain an average inter-base station interference signal strength for each frequency subband and each copy index.

4. The method of claim 3, wherein the first base station receiving the physical signal transmitted by the second base station and making interference measurements based on the received physical signal further comprises:

the first base station obtains at least one of the following as an interference measurement:

average inter-base station interference signal strength for each frequency subband and each replica index, replica indexes of M replicas with strongest average inter-base station interference signal strength within each frequency subband, average inter-base station interference signal strength of the M replicas within each frequency subband, and a transmission power reduction value when the second base station performs downlink transmission using a transmission beam corresponding to the M replicas within each frequency subband,

wherein M is a positive integer, configured by the management center or a system preset value.

5. The method of claim 3, wherein the first base station receiving the physical signal transmitted by the second base station and making interference measurements based on the received physical signal further comprises:

average inter-base station interference signal strength for each frequency subband and each replica index, replica indexes of M replicas among a plurality of replicas whose average inter-base station interference signal strength within each frequency subband is greater than a predetermined threshold, average inter-base station interference signal strengths of the M replicas within each frequency subband, and a transmission power drop value at the time of downlink transmission by the second base station using transmission beams corresponding to the M replicas within each frequency subband,

Wherein M is a positive integer and M ≦ X,

where X is a positive integer and is configured by the management center or is a system predetermined value.

6. The method of claim 1, wherein the step of reporting, by the first base station, the interference measurement result to the second base station or a management center, so that the second base station performs interference coordination at least for the first base station according to the interference measurement result reported by the first base station or the configuration of the management center comprises:

the first base station accesses the cell of the second base station and reports the interference measurement result to the access link

A second base station comprising:

the first base station carries the interference measurement result in a random access procedure Msg3 with the cell to which the second base station belongs, or,

the first base station carries the interference measurement result in an uplink shared channel in the MsgA in the two-step random access process of the cell to which the second base station belongs, or,

and the first base station reports the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the second base station.

7. The method of claim 1, wherein,

the step of the first base station receiving the physical signal transmitted by the second base station comprises:

the first base station receives a physical signal transmitted by the second base station in response to the uplink received interference energy being above a predetermined interference energy threshold.

8. The method of claim 1, further comprising:

the first base station configures a full duplex bandwidth or a bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or the bandwidth portion of the first base station and the second base station do not overlap or do not completely overlap.

9. The method of claim 8, wherein the step of the first base station configuring the full duplex bandwidth or the bandwidth portion within the system bandwidth comprises:

based on the system bandwidth, the full-duplex bandwidth, the coordination multiplexing factor, and the cell identifier of the first base station, a starting position and a frequency domain range of the full-duplex bandwidth or the bandwidth portion of the first base station are determined.

10. An inter-base station interference coordination method includes:

the second base station sends a physical signal to the first base station, so that the first base station performs interference measurement based on the physical signal sent by the second base station and reports an interference measurement result to the second base station or a management center;

and the second base station performs interference coordination at least aiming at the first base station according to the interference measurement result reported by the first base station or the configuration of the management center.

11. The method of claim 10, wherein the physical signals comprise inter-base station measurement physical signals, the inter-base station measurement physical signals being transmitted on one or more frequency subbands, and,

12. The method of claim 11, wherein the manner in which the plurality of copies of the inter-base station measurement physical signal with different copy indexes are repeatedly transmitted on each frequency subband in the same transmission period at least comprises one of:

the second base station transmits at least two copies of the same complex-valued symbol of the inter-base station measurement physical signal on each frequency subband in the same transmission period with different analog transmission beams;

the second base station transmits at least two copies of the same complex-valued symbol of the inter-base station measurement physical signal on each frequency subband in the same transmission period with different digital transmission beams; or

The second base station transmits copies of at least two identical complex-valued symbols of the inter-base station measurement physical signal on each frequency subband in the same transmission period with the same analog transmission beam and the same digital transmission beam.

13. The method of claim 10, wherein the step of the second base station performing interference coordination at least for the first base station according to the interference measurement result reported by the first base station or the configuration of the management center comprises:

Determining a transmitting wave beam corresponding to an interference measurement result reported by a first base station or the configuration of a management center; and

performing the following steps for K transmit beams among the determined transmit beams:

the K transmitting beams are not used in all time frequency resources or specific time frequency resources of the system for downlink transmission; or

Further determining the transmission power reduction values corresponding to the K transmission beams from the interference measurement result, and performing downlink transmission in all time-frequency resources or specific time-frequency resources according to the determined transmission power reduction values corresponding to the K transmission beams when performing downlink transmission by using the K transmission beams;

wherein K is a positive integer and K is ≦ M ≦ number of frequency subbands.

14. The method of claim 13, wherein the particular time-frequency resource comprises one of:

time frequency resources which are configured by the management center and used for interference coordination; or

The second base station acquires the time-frequency resource for interference coordination according to a preset rule,

wherein the preset rule comprises:

taking a fixed section of frequency band in the system bandwidth as a frequency domain resource for interference coordination;

taking a fixed single subframe or a fixed time slot or a time domain symbol in the time slot as a time domain resource for interference coordination;

A combination of the above frequency domain resources and time domain resources.

15. The method of claim 14, wherein the interference measurement is obtained by the second base station from the first base station by:

the second base station accesses the access link of the cell to which the second base station belongs through the first base station to obtain the interference measurement result, and the method comprises the following steps:

the second base station obtains the interference measurement result in the random access procedure Msg3 of the cell to which the first base station and the second base station belong, or,

the second base station obtains the interference measurement result in the uplink shared channel in the MsgA in the two-step random access process of the cell to which the first base station and the second base station belong, or,

and the second base station acquires the interference measurement result on the semi-persistent scheduling physical resource configured to the first base station by the second base station.

16. The method of claim 10, further comprising:

the second base station configures a full duplex bandwidth or a bandwidth portion within the system bandwidth, wherein the full duplex bandwidth or the bandwidth portion of the first base station and the second base station do not overlap or do not completely overlap.

17. The method of claim 16, wherein the step of the second base station configuring the full duplex bandwidth or the bandwidth portion within the system bandwidth comprises:

Based on the system bandwidth, the full-duplex bandwidth, the coordination multiplexing factor, and the cell identifier of the second base station, a starting position and a frequency domain range of the full-duplex bandwidth or the bandwidth portion of the second base station are determined.

18. A first base station that performs inter-base station interference coordination, comprising:

a transceiver configured to transmit and/or receive a signal; and

a processor configured to:

controlling the transceiver to receive a physical signal transmitted by the second base station and to perform interference measurement based on the received physical signal; and

and controlling the transceiver to report the interference measurement result to a second base station or a management center, so that the second base station performs interference coordination at least aiming at the first base station based on the interference measurement result reported by the first base station or the configuration of the management center.

19. A second base station that performs inter-base station interference coordination, comprising:

a transceiver configured to transmit data and/or receive data; and

a processor configured to:

the controller transceiver transmits a physical signal to the first base station so that the first base station performs interference measurement based on the physical signal transmitted by the second base station and reports the interference measurement result to the second base station or a management center;