CN111757384A - Method and apparatus for remote interference coordination for CU-DU split base stations - Google Patents
Method and apparatus for remote interference coordination for CU-DU split base stations Download PDFInfo
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Abstract
The invention provides a method and equipment for remote interference coordination of a CU-DU split base station. The method comprises the following steps: the interfered base station distribution unit device receives the information related to the reference signal receiving state sent by the centralized unit device of the interfered base station and executes or stops the transmission of the reference signal based on the information related to the reference signal receiving state; the distribution unit device of the interfering base station transmits information on the reference signal reception status received by the concentration unit device of the interfering base station, and performs or stops performing the interference coordination scheme based on the information on the reference signal reception status.
Description
Technical Field
The present application relates to wireless communication technologies, and in particular, to a method and an apparatus for exchanging information such as remote interference detection and coordination between a central unit and a distributed unit of a base station.
Background
In a 5G NR (New Radio access) TDD system network, in order to coordinate Interference of a Remote interfering base station (aggregation nb) on a local interfered base station (Victim nb) and ensure reliability of uplink data reception of the local interfered base station, a Remote Interference Management (RIM) research project is introduced into a 5G Phase II-R16 by a 3GPP RAN. As shown in fig. 1, a downlink subframe signal transmitted by a remote interfering base station is affected by atmospheric waveguide refraction, and when reaching a local interfered base station, the downlink subframe signal falls into an uplink subframe period configured by the local base station due to transmission delay, so that interference is generated in receiving and demodulating uplink subframe information of the local interfered base station. Although a single remote interfering base station has little influence on a local interfered base station, if interferences generated by a large number of remote interfering base stations are superposed, the SNR around the local interfered base station is close to or lower than the minimum SNR required when the local interfered base station receives the interference, so that uplink data sent by the UE cannot be normally received in the uplink subframe period or the receiving performance is reduced, and the error rate is increased. Therefore, a RIM mechanism is introduced to avoid or reduce remote interference.
As shown in fig. 2, the 3GPP RAN WG1 defines RIM framework 2.1, and the workflow is as follows:
step 0: atmospheric wave guide phenomena occur and remote interference occurs.
Step 1: when the local base station detects that the rise of the ambient thermal noise interference (IoT) exceeds the threshold during uplink reception, it means that the local base station is interfered by the remote interfering base station, which is called as an interfered base station, and the interfered base station may be a gNB, an eNB or another base station type, and the interfered base station is a gNB for example below, and the method described below is also applicable to other types of base stations. The interfered base station (i.e., Victim gbb) reports to the OAM system (Operation And Management). The OAM divides the interfered base stations into one group and configures the same Remote Interference Management Reference Signal (RIM-RS) and requires the local interfered base stations to transmit. Meanwhile, a remote interference base station (namely, an agressor gNB) starts RIM-RS monitoring under OAM configuration.
Step 2: when the remote interfering base station receives the RIM-RS, it will inform the local interfered base station through a backhaul (backhaul) network that the RIM-RS has been received and the local interfered base station keeps transmitting the RIM-RS, and after the remote interfering base station and the OAM interact, the interference coordination scheme is applied, such as turning off (mute) a downlink symbol generating remote interference to the local interfered base station based on a time domain scheme.
And step 3: when the remote interference base station can not receive the RIM-RS, the local interference base station is informed of the disappearance of the RIM-RS through the backhaul network, and the application of the interference coordination solution is released to be recovered to the previous state.
And 4, step 4: and after receiving the indication that the RIM-RS disappears, the local interfered base station stops transmitting the RIM-RS.
Disclosure of Invention
Technical problem
For the implementation of the above scheme, only conventional base stations are currently considered. However, in the 5G system, in order to support virtualization of network functions, a CU (central unit) -DU (distributed unit) separated base station structure is defined. I.e. one base station can be further divided into a centralized unit and a distributed unit (abbreviated CU and DU in the present invention). The CU has Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP) protocol layers and the like. The DU has a radio link control protocol (RLC), a Medium Access Control (MAC), a physical layer, and the like. Between CU and DU is a standardized public interface F1. The F1 interface is divided into a control plane F1-C and a user plane F1-U. Fig. 3 shows the structure of CU and DU. Therefore, in case of CU-DU separation, more information needs to be exchanged between CU-DUs in view of the implementation of RIM mechanism.
In the prior art, according to the current protocol (TR38.866-g00), the implementation of RIM mechanism has not considered the base station architecture for CU-DU separation. For example, the detection of the remote interference is performed on the DU side of the local base station, and the CU has not obtained relevant information (e.g., which cell under which DU detected the remote interference), which is only known by the first detection of the DU. For example, the RIM-RS received by the remote base station is monitored on its DU side, and the DU is required to report to the CU before the CU knows it. In summary, in order to ensure the correct implementation of the remote interference coordination mechanism, both at the local interfered base station and at the remote interfering base station, the necessary information about RIM needs to be exchanged between CU and DU.
The problem to be solved by the present invention may include interacting relevant information between the CU and DU on the interfered base station side to ensure the correct implementation of RIM mechanism.
The problem to be solved by the present invention may also include interfering with the inter-CU correlation information on the base station side to ensure the correct implementation of the RIM mechanism.
Solution scheme
According to an aspect of the present invention, there is provided a method for a distributed unit apparatus of a base station, the method comprising: receiving information on a reference signal reception state transmitted by a central unit device of a base station; and performing or stopping transmission of the reference signal based on the information on the reference signal reception state.
The method according to the present invention, wherein the information on the reference signal reception status includes at least one of: identification information of the reference signal; information indicating that the reference signal disappears; stopping transmitting the indication information of the reference signal; stopping transmitting the information of the cell or the frequency in which the reference signal is positioned; indication information received by the reference signal; continuing to transmit the indication information of the reference signal; and continuously transmitting the information of the cell or the frequency in which the reference signal is positioned.
The method according to the invention further comprises: receiving information relating to a remote interference measurement configuration transmitted by a hub unit device of a base station; performing remote interference measurement based on the information related to the remote interference measurement configuration.
The method according to the invention further comprises: receiving information related to a reference signal transmission indication transmitted by a hub unit device of a base station; and initiating transmission of the reference signal.
According to the method of the present invention, the information related to the remote interference measurement configuration includes at least one of the following information: a remote interference measurement method; an interference reporting threshold or reporting condition; a transmit reference signal threshold; reference signal configuration information.
According to the method of the present invention, the information related to the reference signal transmission indication includes at least one of the following information: an interfered base station set identification ID; reference signal configuration information; starting to transmit reference signal indication information; cell information for transmitting reference signals is initiated.
The method according to the invention further comprises: transmitting information related to an interference measurement report to a central unit device of a base station, wherein the information related to an interference measurement report includes at least one of: cell information of remote interference is detected; interference measurement results of each interfered cell.
The method according to the invention further comprises: transmitting information related to a reference signal transmission notification to a central unit device of a base station, wherein the information related to the reference signal transmission notification includes at least one of: cell information of remote interference is detected; interference measurement results of each interfered cell; the distribution unit equipment starts to transmit reference signal notification information; starting cell information for transmitting reference signals; configuration information of a reference signal; an interfered base station set identification ID; and starting to transmit the response information of the reference signal.
The method according to the invention further comprises: transmitting information related to a response to cease transmitting reference signals to a central unit device of a base station, wherein the information related to the response to cease transmitting reference signals includes at least one of: the distribution unit equipment stops transmitting the reference signal notification information; identification information of a reference signal; and stopping transmitting the response information of the reference signal.
According to another aspect of the present invention, there is provided a method of a central unit apparatus for a base station, the method comprising: receiving information related to a reference signal reception status from a central unit device of an interfering base station through a backhaul network; and transmitting information about the reference signal reception state to the distribution unit apparatus of the base station to cause the distribution unit apparatus of the base station to perform or stop transmission of the reference signal based on the information about the reference signal reception state.
The method according to the present invention, wherein the information related to the reference signal reception status includes at least one of: identification information of the reference signal; information indicating that the reference signal disappears; stopping transmitting the indication information of the reference signal; stopping transmitting the information of the cell or the frequency in which the reference signal is positioned; indication information received by the reference signal; continuing to transmit the indication information of the reference signal; and continuously transmitting the information of the cell or the frequency in which the reference signal is positioned.
The method according to the invention further comprises: transmitting information related to the remote interference measurement configuration to a distribution unit device of the base station to cause the distribution unit device of the base station to perform remote interference measurement based on the information related to the remote interference measurement configuration.
The method according to the invention further comprises: sending information related to the reference signal transmission indication to the distribution unit device of the base station to enable the distribution unit device of the base station to initiate transmission of the reference signal.
According to the method of the present invention, the information related to the remote interference measurement configuration includes at least one of the following information: a remote interference measurement method; an interference reporting threshold or reporting condition; a transmit reference signal threshold; reference signal configuration information.
According to the method of the present invention, the information related to the reference signal transmission indication includes at least one of the following information: an interfered base station set identification ID; reference signal configuration information; starting to transmit reference signal indication information; cell information for transmitting reference signals is initiated.
The method according to the invention further comprises: receiving information related to an interference measurement report from a distribution unit device of a base station, wherein the information related to an interference measurement report comprises at least one of: cell information of remote interference is detected; interference measurement results of each interfered cell.
The method according to the invention further comprises: receiving information related to a reference signal transmission notification from a distribution unit device of a base station, wherein the information related to the reference signal transmission notification includes at least one of: cell information of remote interference is detected; interference measurement results of each interfered cell; the distribution unit equipment starts to transmit reference signal notification information; starting cell information for transmitting reference signals; configuration information of a reference signal; an interfered base station set identification ID; and starting to transmit the response information of the reference signal.
The method according to the invention further comprises: receiving information related to a response to cease transmitting reference signals from a distribution unit device of a base station, wherein the information related to the response to cease transmitting reference signals comprises at least one of: the distribution unit equipment stops transmitting the reference signal notification information; identification information of a reference signal; and stopping transmitting the response information of the reference signal.
According to another aspect of the present invention, there is provided a method for a distributed unit apparatus of a base station, the method comprising: transmitting information related to a reference signal reception state received by a central unit device of a base station; and performing or stopping performing an interference coordination scheme based on the information related to the reference signal reception state.
The method according to the present invention, wherein the information on the reference signal reception status includes at least one of: identification information of the reference signal; indication information received by the reference signal; cell or frequency information received by the reference signal; information indicating that the reference signal disappears; cell or frequency information where the reference signal disappears.
The method according to the invention further comprises: receiving information related to a reference signal measurement configuration transmitted by a hub unit device of a base station; performing reference signal measurement based on the information related to the reference signal measurement configuration.
The method according to the invention further comprises: receiving information related to an interference coordination scheme execution indication transmitted by a central unit device of a base station; and initiating execution of the interference coordination scheme.
According to the method of the present invention, the information related to the reference signal measurement configuration includes at least one of: a reference signal measurement method; reporting a threshold or reporting a condition; a threshold for performing an interference coordination scheme; configuration information of an interference coordination scheme; the interfering base station set identification ID.
According to the method of the present invention, the information related to the interference coordination scheme execution indication includes at least one of the following information: an interfering base station set identification ID; indication information for performing an interference coordination scheme; configuration information of an interference coordination scheme; cell information of an interference coordination scheme is performed.
The method according to the invention further comprises: transmitting information related to a reference signal measurement report to a central unit device of a base station, wherein the information related to a reference signal measurement report includes at least one of: an interfering base station set identification ID; indication information received by the reference signal; an interference coordination scheme request; distributing interference coordination scheme information configured by unit equipment; cell information received by a reference signal; cell measurements for each detected reference signal.
The method according to the invention further comprises: transmitting information related to an interference coordination scheme execution notification to a central unit device of a base station, wherein the information related to the interference coordination scheme execution notification includes at least one of: cell information received by a reference signal; each cell measurement result of the received reference signal; an interfered base station set identification ID; indication information received by the reference signal; the distribution unit equipment executes the notification information of the interference coordination scheme; distributing interference coordination scheme information configured by unit equipment; cell information for performing an interference coordination scheme; an interfering base station set identification ID; one or more tracking area Identification (ID)/base station global Identification (ID) information; response information of the interference coordination scheme is performed.
The method according to the invention further comprises: receiving information related to an end interference coordination scheme indication transmitted by a central unit device of a base station, wherein the information related to the end interference coordination scheme indication comprises at least one of: ending the interference coordination scheme indication information; identification information of an interference coordination scheme; cell information of the interference coordination scheme is ended.
The method according to the invention further comprises: transmitting information related to ending interference coordination scheme notification to a central unit device of a base station, wherein the information related to ending interference coordination scheme notification comprises at least one of: the distribution unit equipment finishes the notification information of the interference coordination scheme; identification information of an interference coordination scheme; and ending the response information of the interference coordination scheme.
According to another aspect of the present invention, there is provided a method of a central unit apparatus for a base station, the method comprising: receiving information related to a reference signal reception state from a distribution unit device of a base station to cause the distribution unit device of the base station to perform or stop performing an interference coordination scheme based on the information related to the reference signal reception state; and transmitting the information related to the reference signal receiving state to the centralized unit equipment of the interfered side base station through a backhaul network.
The method according to the present invention, wherein the information on the reference signal reception status includes at least one of: identification information of the reference signal; indication information received by the reference signal; cell or frequency information received by the reference signal; information indicating that the reference signal disappears; cell or frequency information where the reference signal disappears.
The method according to the invention further comprises: transmitting information related to the reference signal measurement configuration to the distribution unit device of the base station to cause the distribution unit device of the base station to perform reference signal measurement based on the information related to the reference signal measurement configuration.
The method according to the invention further comprises: and sending information related to the interference coordination scheme execution indication to the distribution unit equipment of the base station so as to enable the distribution unit equipment of the base station to start execution of the interference coordination scheme.
According to the method of the present invention, the information related to the reference signal measurement configuration includes at least one of: a reference signal measurement method; reporting a threshold or reporting a condition; a threshold for performing an interference coordination scheme; configuration information of an interference coordination scheme; the interfering base station set identification ID.
According to the method of the present invention, the information related to the interference coordination scheme execution indication includes at least one of the following information: an interfering base station set identification ID; indication information for performing an interference coordination scheme; configuration information of an interference coordination scheme; cell information of an interference coordination scheme is performed.
The method according to the invention further comprises: receiving information related to a reference signal measurement report from a distribution unit device of a base station, wherein the information related to a reference signal measurement report includes at least one of: an interfering base station set identification ID; indication information received by the reference signal; an interference coordination scheme request; distributing interference coordination scheme information configured by unit equipment; cell information received by a reference signal; cell measurements for each detected reference signal.
The method according to the invention further comprises: receiving information related to an interference coordination scheme execution notification from a distribution unit device of a base station, wherein the information related to the interference coordination scheme execution notification includes at least one of: cell information received by a reference signal; each cell measurement result of the received reference signal; an interfered base station set identification ID; indication information received by the reference signal; the distribution unit equipment executes the notification information of the interference coordination scheme; distributing interference coordination scheme information configured by unit equipment; cell information for performing an interference coordination scheme; an interfering base station set identification ID; one or more tracking area Identification (ID)/base station global Identification (ID) information; response information of the interference coordination scheme is performed.
The method according to the invention further comprises: information related to an end interference coordination scheme indication transmitted to a distribution unit device of a base station, wherein the information related to the end interference coordination scheme indication comprises at least one of: ending the interference coordination scheme indication information; identification information of an interference coordination scheme; cell information of the interference coordination scheme is ended.
The method according to the invention further comprises: receiving information related to ending interference coordination scheme notification sent by a distribution unit device of a base station, wherein the information related to ending interference coordination scheme notification comprises at least one of: the distribution unit equipment finishes the notification information of the interference coordination scheme; identification information of an interference coordination scheme; and ending the response information of the interference coordination scheme.
According to another aspect of the present invention, there is provided a distribution unit apparatus of a base station, the distribution unit apparatus comprising: a transceiver configured to receive and transmit information; a controller configured to control the apparatus to perform receiving of information on a reference signal reception state transmitted by a central unit apparatus of a base station; and performing or stopping transmission of the reference signal based on the information on the reference signal reception state.
According to another aspect of the present invention, there is provided a hub device of a base station, the hub device comprising: a transceiver configured to receive and transmit information; a controller configured to receive information related to a reference signal reception status from a central unit device of an interfering base station through a backhaul network; and controlling the device to transmit information about the reference signal reception state to the distribution unit device of the base station so that the distribution unit device of the base station performs or stops transmission of the reference signal based on the information about the reference signal reception state.
According to another aspect of the present invention, there is provided a distribution unit apparatus of a base station, the distribution unit apparatus comprising: a transceiver configured to receive and transmit information; a controller configured to control the apparatus to perform transmission of information related to a reference signal reception state received by a central unit apparatus of a base station; and performing or stopping performing an interference coordination scheme based on the information related to the reference signal reception state.
According to another aspect of the present invention, there is provided a hub device of a base station, the hub device comprising: a transceiver configured to receive and transmit information; a controller configured to control the device to receive information related to a reference signal reception state from a distribution unit device of a base station, so that the distribution unit device of the base station performs or stops performing an interference coordination scheme based on the information related to the reference signal reception state; and transmitting the information related to the reference signal receiving state to the centralized unit equipment of the interfered side base station through a backhaul network.
According to another aspect of the present invention, there is provided a method for remote interference detection by an interfered base station (Victim gbb), including:
step 1: the DU initiates remote interference measurements.
The DU may perform measurement according to measurement configuration information sent by the CU, and the configuration may be OAM configured to the CU or generated by the CU itself. The measurement configuration information contains one or more of the following:
-measurement methods (e.g. measuring the average of the remote interference noise suffered by a symbol in an uplink subframe over a certain time);
-reporting a threshold or reporting a condition that the DU needs to report the measurement result to the CU if the DU remote interference measurement exceeds the threshold, or according to the reporting condition that the DU reports the remote interference measurement result to the CU;
-a threshold for transmitting the RIM-RS, the DU being capable of initiating transmission of the RIM-RS if the measurement result of the DU satisfies the threshold;
configuration information of RIM-RS (OAM configuration to CU, or CU pre-configured set Identification (ID) generated by itself).
Or the DU may initiate the measurement of the remote interference itself according to the characteristics of the remote interference, or the DU may initiate the measurement of the remote interference under the configuration of OAM.
Step 2: the DU sends a message to the CU reporting the remote interference detection result or the RIM-RS configuration.
And after the DU is measured, the DU reports the measurement result to the CU according to the measurement configuration sent by the CU or the OAM if the report threshold or the emission RIM-RS threshold is included. The message carries one or more of the following information:
-the DU starts transmitting RIM-RS notification information (if the DU can autonomously decide to transmit RIM-RS after OAM or autonomously configure the RIM-RS);
-cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information to transmit RIM-RS);
configuration information of RIM-RS (configuration of RIM-RS may be OAM configured to DU, or the DU may be generated by itself with set ID configured in advance);
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (e.g. interference noise power value, number of interfered symbols, snr when demodulating interfered symbols, etc.) for each interfered cell (if CU obtains from OAM or configures RIM-RS autonomously and sends it to DU, DU must report this information, CU or OAM configures appropriate RIM-RS according to this information);
the interfered bs set ID (OAM may be configured to the DU, or the DU may be preconfigured with the set ID).
And step 3: and the DU receives the message sent by the CU, configures the RIM-RS, starts to transmit the RIM-RS and other instructions. The message contains one or more of the following information:
-indication information to initiate transmission of RIM-RS;
-continuing to transmit indication information of the RIM-RS;
-a RIM-RS reception (reception of RIM-RS) indication;
-a RIM-RS disappearance (disappearance of RIM-RS) indication;
-stop transmitting indication information of RIM-RS;
RIM-RS configuration information (OAM configuration to CU, CU pre-configured with set ID self-generated);
the interfered base station set ID (OAM may be configured to the CU, or the CU may be preconfigured with the set ID);
-cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to transmit RIM-RS if CU knows at step 1 that remote interference is detected);
-cell information to continue transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to continue transmitting RIM-RS if CU already knows cell information to start transmitting RIM-RS);
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to stop transmitting RIM-RS if CU already knows to start transmitting RIM-RS).
And 4, step 4: the DU transmits or stops transmitting the RIM-RS. A message may be sent to the CU indicating that the DU has started transmission or stopped transmitting RIM-RS. The message contains one of the following information:
-initiating transmission of a response message to the RIM-RS (if the CU instructs the DU to transmit the RIM-RS, the CU is informed of this message when the DU has performed successfully or fails);
-stop transmitting RIM-RS response information (if the CU instructs the DU to stop transmitting RIM-RS, the CU is informed of this information when the DU executes successfully);
the DU stops transmitting RIM-RS notification information (DU autonomously decides to stop transmitting RIM-RS, which informs the CU of this information after the DU execution is successful).
The DU may send the RIM-RS on the cell designated by the Uu interface (which may be DU decision or CU designation, in the cell where remote interference is detected or in the cell where remote interference is not detected) according to the configuration information of the RIM-RS obtained in step 3 and the indication information to start the RIM-RS. The DU may then send a response message to the CU initiating transmission of the RIM-RS.
Or the DU obtains the ID of the interfered bs set and the configuration information of the RIM-RS from OAM through step 2 or by using the configuration information of the RIM-RS configured in advance by itself, and when the detection result of the remote interference is greater than the threshold for transmitting the RIM-RS (if the threshold configuration exists), the DU autonomously decides to transmit the RIM-RS on the cell designated by the Uu interface (the DU decides to be in the cell where the remote interference is detected or the cell where the remote interference is not detected). The DU then sends DU start transmission RIM-RS notification information to the CU using step 2.
Or the DU continues to transmit the RIM-RS on the cell specified by the Uu interface (which may be DU decision or CU specification, in the cell where the remote interference is detected or in the cell where the remote interference is not detected) through the indication information of continuing to transmit the RIM-RS obtained in step 3.
Or the DU receives the indication information through the RIM-RS obtained in step 3, and continues to transmit the RIM-RS on the cell specified by the Uu interface (which may be the DU decision or CU specification, in the cell where the remote interference is detected or the cell where the remote interference is not detected).
Or the DU stops sending the RIM-RS on the cell specified by the Uu interface (which may be DU decision or CU specification) according to the instruction information for stopping RIM-RS obtained in step 3. The DU may then send a response message to the CU to stop transmitting RIM-RS.
Or the DU stops transmitting the RIM-RS on the cell specified by the Uu interface (which may be DU decision or CU specification) through the RIM-RS disappearance indication information obtained in step 3. The DU may then send a stop transmitting RIM-RS notification message to the CU.
According to another aspect of the present invention, there is provided a method for an interfering base station (Aggressor gbb) to cancel remote interference, including:
step 1: DU initiates RIM-RS detection.
The DU may initiate RIM-RS detection based on measurement configuration messages received from CUs. The information related to the RIM-RS measurement configuration may be OAM configured for the CU, or may be sent to the CU of the interfering base station through backhaul signaling by using the interfering base station set ID and the interfered base station set ID preset before when the interfered base station detects the remote interference. The configuration information contains one or more of the following:
measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting a threshold or reporting condition, the DU requiring reporting of the measurement to the CU if the RIM-RS measurement of the DU exceeds the threshold, or reporting the RIM-RS measurement to the CU according to the reporting condition;
-a threshold for performing an interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if its RIM-RS measurements fulfil the threshold;
configuration information of interference coordination schemes, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the research progresses) (either acquired by the CU interacting with the OAM, or pre-configured by the CU);
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Interfering base station set ID (either acquired by CU interacting with OAM or pre-configured by CU).
Or the DU starts RIM-RS detection by itself directly according to the configuration of OAM.
After the DU detects the RIM-RS, if the DU can decide to configure the interference coordination mechanism itself or the DU can obtain the interference coordination mechanism from OAM, the DU executes the interference coordination mechanism, and sends the message of step 2 to the CU to indicate that the RIM-RS has received and notify the CU that the interference coordination mechanism has started to be executed.
If, after the DU detects the RIM-RS, the DU is not configured with an interference coordination mechanism, the DU may send a message to the CU indicating that the RIM-RS has received and requested an interference coordination mechanism.
And step 2, the DU sends a message to the CU to inform information about the detection state of the RIM-RS and information about configuration application of the interference coordination scheme and the like. The message carries one or more of the following information:
RIM-RS reception (reception of RIM-RS) indication (optional information, since when only base station set ID or interfered base station set ID is present, it implicitly also indicates that RIM-RS is detected);
-a RIM-RS disappearance (missing of RIM-RS) indication (optional information, if RIM-RS is detected with implicit indication when only base station set ID or interfered base station set ID is available, then also implicit indication of disappearance of RIM-RS when no base station set ID or interfered base station set ID is available);
base station set ID or interfered base station set ID (obtained by demodulating RIM-RS) (if RIM-RS is detected with implicit indication when only base station set ID or interfered base station set ID is available, then also implicit indication of disappearance of RIM-RS when there is no base station set ID or interfered base station set ID);
-DU performs interference coordination scheme notification information;
interference coordination scheme information of DU configuration, one or more of the following (not excluding interference coordination schemes newly incorporated into the specification as the research advances):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information, such as cell identification information (NR CGI, or PCI, or index), for performing the interference coordination scheme (optional information, CU stores cell information for performing the interference coordination scheme);
an interference coordination scheme request (optional information, when carrying measurement result information of the RIM-RS at the DU side, an implicit representative may also request an interference coordination scheme, and the CU selects a suitable interference coordination scheme according to the measurement result or interacts with OAM to obtain the interference coordination scheme) (if the DU is configured with the interference coordination scheme, no request is needed);
cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
each cell measurement result (optional information such as RIM-RS power value, delay, etc.) of the RIM-RS is detected (if the DU is not configured with an interference coordination mechanism, and needs to be obtained from the CU, this information must be reported, and the CU configures an appropriate interference coordination mechanism according to this information);
interfering base station set identity ID (DU acquired interactively with OAM, or DU preconfigured if it transmits RIM-RS detection or disappearance information to the interfered base station using optional backhaul scheme Solution 1 mentioned in specification TR38.866, and has not been previously notified to the CU by other means such as F1Setup procedure, or if the information is updated, even if previously notified, the CU must be notified of this information);
-one or more tracking area identity ID/base station global identity ID information (DU and OAM interworking query results in one or more tracking area identity ID/base station global identity ID information mapped by the interfered base station set ID, CU has to be informed if this information is transmitted over the backhaul network to the interfered base station by means of the alternative Solution 2 mentioned in the specification TR38.866 for detection or disappearance of RIM-RS.
And if the interference base station CU obtains the RIM-RS receiving indication and the disappearance indication, the RIM-RS receiving indication or the disappearance indication is notified to the base stations in the interference base station set by using a return signaling transmission mechanism.
And 3, the DU receives a message sent by the CU, wherein the message carries the configuration information of the CU about an interference coordination mechanism (the interference coordination mechanism can be configured to the CU by OAM, and can also be decided by the CU). The message contains one or more of the following information:
interfering base station set ID (obtained by CU interacting with OAM or pre-configured by CU);
configuration information of interference coordination schemes, one or more of the following do not exclude interference coordination schemes that are newly incorporated into the specification as research progresses) (either acquired by the CU interacting with the OAM, or pre-configured by the CU);
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
-performing interference coordination scheme indication information;
end interference coordination scheme indication information (after the CU receives the RIM-RS disappearance information reported by the DU, if the CU controls the stopping of the interference coordination scheme, the CU instructs the DU to end the execution of the interference coordination scheme by sending this information);
cell information, such as cell identification information (NR CGI, or PCI, or index), to perform the interference coordination scheme (optional information, which may directly indicate cell information to perform the interference coordination scheme if the CU knows at step 2 that the cell information of the RIM-RS was received);
cell information, such as cell identification information (NR CGI, or PCI, or index), to end the interference coordination scheme (optional information, cell information that may directly indicate to end the interference coordination scheme if the CU already knows the cell information to initiate execution of the interference coordination scheme).
And 4, starting and ending the interference coordination scheme by the DU. A message may be sent to the CU indicating that the DU has started execution or ended the interference coordination scheme. The message contains one of the following information:
-response information for executing the interference coordination scheme (indication by the CU that the DU initiated the interference coordination scheme execution, the CU being informed by this response information after success or failure of the DU execution);
-response information to end the interference coordination scheme (indication by the CU that the DU ends the execution of the interference coordination scheme, the DU being informed of the CU by this response information after successful end of the execution);
DU end interference coordination scheme notification information (DU autonomously decides to end interference coordination scheme execution, from which the CU is notified after DU end execution is successful).
The DU may obtain an interference coordination (interference) mechanism from OAM according to step 2 when the DU detects the RIM-RS, and if the measurement result is greater than the threshold for performing the interference coordination scheme, the DU performs the interference coordination scheme on the designated cell (the cell where the RIM-RS is detected or the cell where the RIM-RS is not detected). Then, the DU sends DU execution interference coordination scheme notification information to the CU, and may also carry DU configured interference coordination scheme information to the CU. If the measurement result does not satisfy the threshold for executing the interference coordination scheme, the DU reports the interference coordination scheme configured by the DU and the detection condition of the RIM-RS to the CU through step 2, and then the CU sends a message to the DU through step 3 to indicate the DU to start executing the interference coordination scheme. The DU performs an interference coordination scheme on the designated cell (either the cell in which the RIM-RS is detected or the cell in which the RIM-RS is not detected, possibly directly designated by the CU). The DU may then send response information to the CUs to perform the interference coordination scheme.
The DU may obtain the interference coordination mechanism from the CU according to step 3 when the DU detects the RIM-RS, and then the DU performs the interference coordination scheme on the designated cell (possibly the DU decides on the cell where the RIM-RS is detected or the cell where the RIM-RS is not detected, or possibly the CU directly designates). The DU may then send response information to the CUs to perform the interference coordination scheme.
The DU may end the execution of the interference coordination scheme on the designated cell (the cell in which the RIM-RS is detected or the cell in which the RIM-RS is not detected) according to the step 2 when the DU detects the disappearance of the RIM-RS, and send a RIM-RS disappearance indication and DU end interference coordination scheme notification information to the CU in the step 2. Or after the RIM-RS disappearance indication is notified to the CU in step 2, the CU issues an indication to the DU to end the interference coordination scheme in step 3, and then the DU may send a response message to end the interference coordination scheme to the CU.
Technical effects
According to embodiments of the present invention, for a CU-DU separated base station, the CU and DU may interact with necessary or optional information about RIM mechanism implementation to ensure correct or more optimal implementation of RIM mechanism.
Drawings
FIG. 1 is a schematic diagram of remote interference generation;
fig. 2 is a work flow diagram according to RIM framework 2.1;
FIG. 3 is a NG-RAN architecture diagram including CU-DU split base stations;
fig. 4 is a signaling flow diagram of an interfered base station side according to an embodiment of the present application;
fig. 5 is a signaling flow diagram of an interfering base station side according to an embodiment of the present application;
FIG. 6 is a flow chart of the operation of the improved RIM framework 2.1 under CU-DU separation according to an embodiment of the present application;
fig. 7 is a flowchart of the entire RIM signaling for acquiring RIM-RS configuration information through CU and OAM interaction according to an embodiment of the present application;
fig. 8 is a flowchart of the entire RIM signaling for acquiring RIM-RS configuration information through DU and OAM interaction according to an embodiment of the present application;
fig. 9 is a block diagram of a distribution unit of an interfered base station according to an embodiment of the present application;
fig. 10 is a block diagram of a centralized unit of interfered base stations according to an embodiment of the application;
fig. 11 is a block diagram of a distribution unit of an interfering base station according to an embodiment of the present application; and
fig. 12 is a block diagram of a centralized unit of an interfering base station according to an embodiment of the application.
Detailed Description
The message names in the present invention are only examples, and other names may be used. The information to be transmitted between the CU and the DU may individually define a new message manner, or may utilize a manner of adding a new IE in an existing message in the existing F1 interface specification 3GPP TS38.473 (for example, adding a new IE in a gNB-DU Configuration Update or a gNB-CU Configuration Update message).
The description in the following examples refers to specific names and explanations as follows:
OAM (operation And management): the operation maintenance management entity and the system are particularly responsible for configuration and measurement configuration of the RIM-RS, configuration of a set Identifier (ID), configuration of certain interference coordination schemes and the like.
And 2, the network element of the AMF (Access and Mobility Management function) and the 5G core network is responsible for the access of the 5G base station and the Mobility Management, and the 5G base station is connected with the AMF through an NG-C interface.
3. Identification information of reference signal: and the Identification (ID) information of the interfered base station set, namely the ID of the interfered base station set, is identified by the base station set Identification (ID) or the set ID, and each set ID corresponds to one RIM-RS. Identification information indicating the reference signal in other ways, such as a reference signal ID or index, is of course not excluded.
4. Reference signal: the reference signal mentioned herein refers to the reference signal of the RIM-RS remote interference management, and the set ID information is encoded in the reference signal and transmitted by using the specified sequence, time frequency resource.
5. Identification information of interference coordination scheme: the interference coordination scheme adopted when a certain reference signal is received can be identified by the corresponding relation of the interfered base station set ID and the reference signal, or by the base station set ID, or by the set ID, and each set ID corresponds to an interference coordination scheme. Identification information indicating the interference coordination scheme in other ways, such as an ID or an Index (Index) of the interference coordination scheme, is of course not excluded.
6. Tracking area identification ID/base station global identification ID: namely TAI (tracking Area identity)/GlobalgNB ID.
FIG. 4 depicts a first embodiment of the present invention. The embodiment describes a process of remote interference detection by an interfered base station. The interfered base station (Victim gbb) is separated into a base station centralized control unit CU and a base station distribution unit DU, and one CU can be connected to a plurality of DUs. The base station may be a 5G base station, or an LTE base station, or a base station in other access modes, and this embodiment takes the 5G base station gNB as an example, and if the base station is used in other systems, the corresponding interfaces and message names are also changed accordingly. Note that the following steps are not all necessary, and all or part of the steps may be performed in different cases, for example, whether OAM is configured in a DU or a CU.
And 400, the interfered base station CU sends a remote interference measurement configuration message to the DU, and the DU is configured to carry out remote interference measurement.
The remote interference measurement configuration may be OAM configured to the CU or may be self-generated by the CU. The DU receives a measurement message for configuring the DU to perform remote interference, which is sent by the CU, wherein the message carries measurement configuration information and contains one or more of the following information:
-measurement methods (e.g. measuring the average of the remote interference noise suffered by a symbol in an uplink subframe over a certain time);
-reporting a threshold or reporting a condition that the DU needs to report the measurement result to the CU if the DU remote interference measurement exceeds the threshold, or according to the reporting condition that the DU reports the remote interference measurement result to the CU;
-a threshold for transmitting the RIM-RS, the DU being capable of initiating transmission of the RIM-RS if the measurement result of the DU satisfies the threshold;
configuration information of RIM-RS (OAM configuration to CU, or CU pre-configured set ID generated by itself).
Or for the detection of the remote interference, the DU may distinguish by an interference characteristic (when a cell or cells on the DU monitor, at an air interface, that a symbol (symbol) in an uplink subframe is suffering from thermal noise interference (IoT), and exhibit a state in which noise power gradually decreases from high to low as a symbol time domain expands, indicating that the noise is caused by the remote interference), so the DU may start the measurement configuration by itself without sending a message to the CU to trigger the DU to perform the measurement of the remote interference, or the DU may start the remote interference detection by acquiring the measurement configuration through OAM, that is, without performing step 400.
The DU may be preconfigured with a remote interference reporting threshold or obtained from the CU via step 400. If the DU detects that the remote interference exceeds a set reporting threshold (which may be an absolute value of the remote interference such as how many dBm or a relative value such as a minimum SNR required for uplink demodulation), the DU will report that the CU detects the remote interference.
Step 401: the interfered base station DU sends a remote interference measurement report message to the base station CU reporting the detected remote interference.
When the DU detects the remote interference, the DU sends a message 401 to the CU to report the remote interference, where the message 401 carries one or more of the following information:
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (such as interference noise power value, number of interfered symbols, signal-to-noise ratio when demodulating interfered symbols, etc.) of each interfered cell.
Of course, it is also possible that the DU reports the remote interference situation without the above specific information, and only the CU is reported that the DU detects the remote interference. If the result of the remote interference detected by the DU does not satisfy the threshold for transmitting the RIM-RS, after the DU reports that the remote interference is detected, if the DU does not obtain the configuration information of the RIM-RS through step 400, the CU waits to configure the RIM-RS, and then starts to transmit the RIM-RS. If the RIM-RS configuration information is obtained, the DU starts to transmit the RIM-RS after obtaining the instruction of the CU.
Step 402: the interfered base station CU sends a reference signal transmission indication message to the base station DU, informing the DU to start the transmission of the RIM-RS.
The CU receives the detection report sent by the DU, decides to start the transmission of the RIM-RS, and sends a message to the DU to inform the DU of starting the transmission of the RIM-RS. If the OAM configures the information of the RIM-RS on the CU, the message of step 402 may also carry configuration information of the RIM-RS, the message indicating the time-frequency resources needed for transmitting the RIM-RS, or may also contain DU and cell information for transmitting the RIM-RS. Message 402 carries one or more of the following information:
the interfered base station set ID (OAM configuration may be for CU, or CU pre-configured set ID self-generated, if information is updated, DU must be notified);
RIM-RS configuration information (either OAM configured to the CU or the CU pre-configured with the set ID generated by itself-if the configuration information is updated, the DU must be notified);
-indication information to initiate transmission of RIM-RS;
cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to transmit RIM-RS if CU already knows cell information to detect remote interference in step 401).
And after the DU obtains the indication of the CU, the RIM-RS is transmitted by using the configured time-frequency resources in the cell designated by the CU. Or if the CU does not specify cell information for transmitting the RIM-RS, the DU determines to transmit the RIM-RS using the configured time-frequency resources on the cell where the remote interference is detected or the cell where the remote interference is not detected.
Step 403: the interfered base station DU sends a reference signal transmission notification message to the base station CU, and the DU is notified that the information of the RIM-RS is started to be transmitted to the CU.
If the DU can decide to start transmission of the RIM-RS by itself, i.e. the CU configures the configuration information of the RIM-RS and the threshold for transmission of the RIM-RS in step 400, or the OAM configures the threshold for transmission of the DU and the configuration information of the RIM-RS, the result of remote interference detection of the DU satisfies the threshold for transmission of the RIM-RS, the DU decides to start transmission of the RIM-RS, and steps 401 and 402 may not be executed. Directly from step 400, execution proceeds to step 403. Or if no RIM-RS transmission threshold is configured, the DU can directly and autonomously determine or acquire information such as the configuration of the RIM-RS through interaction with the OAM after detecting the remote interference, and directly start the transmission of the RIM-RS. The DU may inform the CU of the configuration information of the RIM-RS decided by the DU (or the OAM configured to the DU) with the message of step 403. The message of step 403 carries one or more of the following information:
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (optional information, such as interference noise power value, number of interfered symbols, signal-to-noise ratio when demodulating interfered symbols, etc.) for each interfered cell;
-DU start-up transmitting RIM-RS notification information;
-cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information to transmit RIM-RS);
configuration information of RIM-RS (configuration of RIM-RS can be OAM configured to DU, or the DU can be generated by itself with set ID configured in advance;
the interfered bs set ID (OAM configuration to DU or DU pre-configured set ID.. CU must be notified if information is updated).
When a DU finds remote interference, it may be necessary for a DU near the DU to transmit the same RIM-RS signal in order to increase the signal energy for transmitting the RIM-RS, and the DU informs the CU of the RIM-RS configuration information determined by the DU (or configured by OAM for the DU), and the CU needs to forward the RIM-RS configuration information to other DUs. Or when a DU discovers remote interference, it may be necessary for a DU near the DU to transmit the same RIM-RS signal in order to increase the signal energy for transmitting the RIM-RS, the DU informs the CU that the DU discovers remote interference, the CU determines the configuration information (or OAM configuration to the CU) of the RIM-RS, and sends the RIM-RS configuration information to all corresponding DUs.
This message may be the response message of step 402 if the configuration information of the RIM-RS is configured by the CU to the DU in step 402, or/and the DU initiates the transmission of the RIM-RS based on the message of step 402. In this case the message of step 403 contains the following information:
-initiating transmission of a response message to the RIM-RS (CU instructs the DU to transmit the RIM-RS, whereby the CU is informed when the DU has performed successfully or fails).
Since there are multiple DUs in the same area where remote interference is detected, and there are some possibly deployed CUs under different base stations, the DUs detecting remote interference and the connected CUs perform the above steps, and then the DUs get the same interfered base station set ID and the same RIM-RS configuration information, and initiate RIM-RS transmission.
When the DU detects remote interference, there may be remote interference base stations in different areas, and thus their interference characteristics may be different (for example, interference frequency bands are different), so that the DU or CU or OAM may allocate a plurality of different RIM-RS configuration information and different Set IDs to the DU by analyzing the interference measurement result, and then the DU transmits a plurality of RIM-RSs simultaneously over the air interface.
The interference base station generates remote interference on the interfered base station through the atmospheric waveguide phenomenon, and due to channel reciprocity, the interference base station can also receive the RIM-RS transmitted by the interfered base station through the atmospheric waveguide phenomenon. When the interfering base station detects the RIM-RS, the interference coordination scheme is started to be executed, and then the receiving indication information of the RIM-RS is transmitted back to the interfered base station through the backhaul network. The reception indication information of the RIM-RS is first received by the interfered base station CU, which needs to be informed to the DU by a triggering step 404.
Step 404: and the CU of the interfered base station sends a reference signal continuous transmission indication message or a reference signal receiving indication message to the DU, and the DU is instructed to continuously transmit the RIM-RS.
After the CU of the interfered base station receives the status information indicating the reception of the RIM-RS forwarded from the backhaul network, the CU may send a message to the DU indicating the reception status of the RIM-RS to the DU, and then the DU decides to continue transmitting the RIM-RS, or directly instructs the DU to continue transmitting the RIM-RS, to monitor when the atmospheric waveguide phenomenon disappears. This indication message is not necessary because the DU is already in a state of transmitting RIM-RS, and it is assumed that the mechanism on the DU side is to continue transmitting RIM-RS until the RIM-RS disappearance indication is not received or transmission of RIM-RS indication information is stopped. If there is a corresponding timer mechanism on the DU side, the DU stops transmitting RIM-RS if the timer has not received the RIM-RS reception indication or continues to transmit the RIM-RS indication information before the timer expires, so that this indication message is mandatory. The message contains at least one of the following information:
-identification information of the RIM-RS;
RIM-RS reception (reception of RIM-RS) indication information (if the DU transmits a plurality of RIM-RS of different set IDs simultaneously, it needs to indicate which RIM-RS corresponding to the set ID is received by the interfering base station, i.e. carries identification information of the RIM-RS);
indication information of continuous RIM-RS transmission if the DU transmits a plurality of RIM-RS of different set-IDs simultaneously, it needs to indicate which set-ID corresponds to RIM-RS to continue transmission, i.e. carries identification information of RIM-RS);
cell information to continue transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to continue transmitting RIM-RS if CU already knows cell information to start transmitting RIM-RS).
When the DU gets the status information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS and the DU can decide that these cells continue to transmit the RIM-RS.
If the atmospheric wave guide phenomenon disappears, the interference base station cannot receive the RIM-RS transmitted by the interfered base station. And when the interference base station can not detect the RIM-RS, ending the execution of the interference coordination scheme, and then returning the disappearance indication information of the RIM-RS to the interfered base station through the return network. The disappearance indication of the RIM-RS is first received by the interfered base station CU and needs to be informed to the DU by the triggering step 405.
Step 405: and the CU of the interfered base station sends a reference signal transmission stopping indication message or a reference signal disappearance indication message to the DU, and the DU is instructed to stop transmitting the RIM-RS.
And when the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates that the RIM-RS disappears, the atmospheric waveguide phenomenon disappears, and the RIM-RS disappearing information needs to be sent to the DU, or the DU is directly indicated to stop sending the RIM-RS. The message contains at least one of the following information:
-identification information of the RIM-RS;
RIM-RS disappearance (discard of RIM-RS) indication information (if the DU transmits a plurality of RIM-RS of different set IDs simultaneously, it needs to indicate which set ID corresponding RIM-RS cannot be received at the interfering base station, i.e. carries identification information of RIM-RS);
-indication information to stop transmitting RIM-RS (if the DU transmits a plurality of RIM-RS of different set-IDs simultaneously, it needs to indicate which set-ID corresponding RIM-RS to stop transmitting, i.e. carries identification information of RIM-RS);
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to stop transmitting RIM-RS if CU already knows to start transmitting RIM-RS).
When the DU gets the status information of the disappearance of the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, the DU can decide to stop transmitting the RIM-RS, and can then send a response message to inform the CU.
Step 406: the DU of the interfered base station sends a response message to the CU indicating that the DU has stopped transmitting the RIM-RS.
If the message of step 405 carries the indication information of RIM-RS disappearance (RIM-RS) to the DU, the DU may send notification information of RIM-RS transmission stop to the CU after stopping transmitting the RIM-RS. The message in step 406 contains the following information:
-the DU stops transmitting RIM-RS notification messages (if the DU transmits RIM-RS for multiple different Set IDs simultaneously, it needs to indicate which Set ID corresponds to the RIM-RS that has stopped transmitting, i.e. carries the identification information of the RIM-RS);
-identification information of the RIM-RS.
If the message of step 405 carries indication information for stopping transmitting the RIM-RS to the DU, after the DU stops transmitting the RIM-RS, a response message may be sent to the CU to indicate friendly ending of the process of stopping transmitting the RIM-RS. The message in step 406 contains the following information:
-stop transmitting RIM-RS response information (if the DU transmits several RIM-RS of different Set IDs simultaneously, it needs to indicate which Set ID the corresponding RIM-RS has stopped transmitting, i.e. carries RIM-RS identification information);
-identification information of the RIM-RS.
Steps 401 to 406 in fig. 4 may be performed in the order shown in fig. 4, or may be performed in other orders, and each of the above steps may be performed alone, or any two or more of the steps may be performed in combination.
In one embodiment, only 404 is performed, and further, this step may be performed when the interfered base station DU is connected with OAM, or the interfered base station CU is connected with OAM.
In one embodiment, only 405 is performed, and further, this step may be performed when the interfered base station DU is connected with OAM, or the interfered base station CU is connected with OAM.
In one embodiment, 405 and 406 are performed, and further, this step may be performed when the interfered base station DU and OAM or the interfered base station CU and OAM are connected.
In one embodiment, only reference signal transmission notification is performed 403, further this step may be performed when the interfered base station DU is connected with OAM.
In one embodiment, 401 and 402 are performed, and further, this step may be performed when the interfered base station DU is connected with OAM, or the interfered base station CU is connected with OAM.
In one embodiment, 401, 402 and 403 are performed, and further this step may be performed when the interfered base station DU is connected with OAM or the interfered base station CU is connected with OAM.
FIG. 5 depicts embodiment two of the present invention. The embodiment describes a process of performing RIM-RS detection by an interfering base station. The interfering base station (Aggressor gbb) is separated into a base station centralized control unit CU and a base station distribution unit DU, and one CU can be connected to a plurality of DUs. The base station may be a 5G base station, or an LTE base station, or a base station in other access modes, and this embodiment takes the 5G base station gNB as an example, and if the base station is used in other systems, the corresponding interfaces and message names are also changed accordingly. Note that the following steps are not all necessary, and all or part of the steps may be performed in different cases, for example, whether OAM is configured in a DU or a CU.
Step 500: and the CU of the interference base station sends a reference signal measurement configuration message to the DU, and instructs the DU to monitor the RIM-RS.
The DU may initiate RIM-RS detection based on measurement configuration messages received from CUs. The information related to the RIM-RS measurement configuration may be OAM configured for the CU, or may be sent by the interfered base station to the CU of the interfering base station through bachkaul signaling by using the interfering base station set ID and the interfered base station set ID preset before after the interfered base station detects the remote interference. The configuration information contains one or more of the following:
measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting a threshold or reporting condition, the DU requiring reporting of the measurement to the CU if the RIM-RS measurement of the DU exceeds the threshold, or reporting the RIM-RS measurement to the CU according to the reporting condition;
-a threshold for performing an interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if its RIM-RS measurements fulfil the threshold;
configuration information of interference coordination schemes, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the research progresses) (which may be OAM configured to a CU or generated by the CU itself);
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Interfering base station set ID (either acquired by CU interacting with OAM or pre-configured by CU).
Or the DU directly obtains the measurement configuration of the RIM-RS and the interfering bss ID from the OAM, starts monitoring of the RIM-RS, and does not need the CU to send a message to trigger the DU to perform detection of the RIM-RS, i.e., does not need to perform step 500.
When the interfered base station DU detects remote interference, a RIM-RS is configured, and after the RIM-RS is transmitted at the air interface, the base station (aggregate gNB) causing the remote interference can also receive the RIM-RS at the air interface through the atmospheric waveguide phenomenon. When a DU of an interference base station detects RIM-RS for the first time at an air interface, if the RIM-RS measurement result of the DU exceeds a reporting threshold (the threshold can be the RIM-RS power absolute value such as dBm), the DU reports that RIM-RS information is monitored to the CU, and then the CU interacts with OAM to obtain a configured interference coordination scheme and an allocated interference base station set ID, or the CU can also decide the interference coordination scheme and utilize the pre-configured interference base station set ID by itself and then sends a message indication to the DU. Or the DU directly reports the monitored RIM-RS information to the OAM, and the configured interference coordination scheme and the allocated interference base station set ID are obtained from the OAM. Or the DU may also configure the interference coordination scheme itself and utilize the pre-configured interfering base station set ID. Or the DU obtains the configuration information of the interference coordination scheme configured by the CU and the interfering bss ID in step 500.
Step 501: the DU of the interfering base station sends a reference signal measurement report message to the CU reporting the detection of the RIM-RS.
When a DU of an interfering base station detects a RIM-RS at an air interface for the first time, if a RIM-RS measurement result of the DU exceeds a reporting threshold (the threshold may be an absolute value of RIM-RS power, such as how many dBm), but does not satisfy a threshold for executing an interference coordination scheme, the DU needs to report to a CU, and a message 501 includes one or more of the following information:
the interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered base station set ID is present, it is also implicitly indicated that RIM-RS is detected);
RIM-RS reception (reception of RIM-RS) indication) (optional information, since when only the interfered base station set ID is present, it implicitly indicates that RIM-RS is detected as well);
an interference coordination scheme request (optional information, when carrying measurement result information of the RIM-RS at the DU side, an implicit representative may also request an interference coordination scheme, and the CU selects a suitable interference coordination scheme according to the measurement result or obtains the interference coordination scheme from the OAM) (if the DU is configured with the interference coordination scheme, no request is needed);
-DU configured interference coordination scheme information, one or more of the following (optional information, DU configured interference coordination scheme by OAM or itself):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
cell measurement results (e.g. information of RIM-RS power value, time delay, etc.) of each detected RIM-RS.
If the DU requests the CU for an interference coordination scheme, the CUs and OAM of the interfering bs interact to obtain an implemented interference coordination scheme and a configured interfering bs set ID, or the CUs may decide to implement the interference coordination scheme and utilize the pre-configured interfering bs set ID by themselves, and then send the scheme to the DU.
Step 502: and the CU of the interference base station sends an interference coordination scheme execution instruction message to the DU, and instructs the DU to start executing the interference coordination scheme.
The interfering base station CU sends a message to the base station DU, the message of step 502 indicating which interference coordination scheme the DU starts to perform. This message contains one or more of the following information:
interfering base station set ID (acquired by CU interacting with OAM or pre-configured by CU, DU must be notified if the information is updated);
-indication information to perform an interference coordination scheme;
configuration information of interference coordination schemes, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as a result of research) (OAM configuration to CU, or generated by CU itself, if DU is not configured with interference coordination scheme, DU must be informed):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information, such as cell identification information (NR CGI, or PCI, or index), to perform the interference coordination scheme (optional information, cell information to perform the interference coordination scheme may be directly indicated if the CU knows at step 501 that the cell information of the RIM-RS was received).
After receiving the message 502, the interfering base station DU starts to perform the interference coordination scheme on the cell indicated by the CU. The DU may perform the interference coordination scheme on a cell in which the RIM-RS is detected or on a cell in which the RIM-RS is not detected if the CU does not have cell information indicating that the DU performs the interference coordination scheme.
Step 503: and the DU of the interference base station sends an interference coordination scheme execution notification message to the CU, and notifies the CU of the information that the DU starts executing the interference coordination scheme.
When the DU detects the RIM-RS, if the DU can autonomously start to execute the interference coordination scheme, it does not need to ask the CU any more, that is, the CU configures configuration information of the interference coordination scheme, a threshold for executing the interference coordination scheme, and an interfering bs set ID in step 500. Or reporting the monitored RIM-RS information to the OAM by the DU, obtaining a configured interference coordination scheme and an allocated interference base station set ID from the OAM, or obtaining one or more tracking area identification ID/base station global identification ID information mapped by an interfered base station set ID contained in the RIM-RS from OAM inquiry. Or the DU may also configure the interference coordination scheme itself and utilize the pre-configured interfering base station set ID. And the RIM-RS measurement result of the DU detection satisfies the threshold for performing the interference coordination scheme (if the threshold exists), the DU will immediately start performing the interference coordination scheme, and steps 501 and 502 may not be performed, and step 500 proceeds to step 503. The DU may inform the CUs with the message of step 503 of configuration information of the interference coordination scheme decided by the DU (or OAM configured to the DU). The message of step 503 contains one or more of the following information:
cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
cell measurement results (optional information, such as RIM-RS power values, time delays, etc.) for each detected RIM-RS;
the interfered base station set ID (acquired by demodulating RIM-RS) (when only the interfered set ID is present, it is also implicitly indicated that RIM-RS was detected);
RIM-RS reception (reception of RIM-RS) indication (optional information, since when there is only the Victim ginbset ID, it implicitly also indicates that RIM-RS was detected);
-DU performs interference coordination scheme notification information;
DU configured interference coordination scheme information, one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the research advances) (the configuration of the interference coordination scheme may be OAM configured to the DU or the DU itself configured.
Time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information, such as cell identification information (NR CGI, or PCI, or index), for performing the interference coordination scheme (optional information, CU stores cell information for performing the interference coordination scheme);
interfering base station set ID (OAM may be configured to DU, DU may also be preconfigured with set ID. if it transmits RIM-RS detection or disappearance information to the interfered base station using optional backhaul scheme Solution 1 mentioned in specification TR38.866, and CU has not been informed by other means such as F1Setup procedure before or has to be informed if the information is updated even if it was previously informed)
-one or more tracking area identity ID/base station global identity ID information (DU and OAM interworking query results in one or more tracking area identity ID/base station global identity ID information mapped by the interfered base station set ID, CU has to be informed if this information is transmitted over the backhaul network to the interfered base station by means of the alternative Solution 2 mentioned in the specification TR38.866 for detection or disappearance of RIM-RS.
When a DU detects a RIM-RS, and it may be necessary for the DUs in the vicinity of the DU to execute the same interference coordination scheme in order to expand the execution range of the interference coordination scheme, the DU notifies the CU of the configuration information of the interference coordination scheme determined by the DU (or configured by OAM for the DU), and the CU needs to forward the configuration information of the interference coordination scheme to other DUs. Or when a DU detects a RIM-RS, it may be necessary for the DUs near the DU to execute the same interference coordination scheme in order to expand the execution range of the interference coordination scheme, and the DU notifies the CU, the DU discovers the RIM-RS, the CU determines configuration information of the interference coordination scheme, and sends the configuration information of the interference coordination scheme to all corresponding DUs.
This message may be the response message of step 502 if the configuration information of the interference coordination scheme is configured to the DU by the CU in step 502 or/and the DU initiates the execution of the interference coordination scheme based on the message of step 502. In this case the message of step 503 contains the following information:
-response information to perform the interference coordination scheme (CU instructs DU to perform the interference coordination scheme, from which information CU is informed when DU execution succeeds or fails).
Since there are multiple DUs that detect the RIM-RS in the same area, and some DUs may be deployed in CUs under different bss, the DUs that detect the RIM-RS and the connected CUs perform the above steps, and then the DUs obtain the same interfering bss ID, corresponding interference coordination scheme configuration information, and start execution of the interference coordination scheme.
The DU may detect multiple RIM-RSs simultaneously, which may be generated by interfered base stations in different regions. Because the interference characteristics may be different for them (for example, the number of interfered symbols is different), the interfered base stations in different areas can allocate different RIM-RS configuration information and different set IDs to the DU by analyzing the interference measurement result, and then transmit the different configured RIM-RS on the air interface by using the DU of the interfered base station in the non-area. In this way, the DU of the interfering base station can simultaneously detect RIM-RS information of different set IDs at the air interface. Then, the DU or CU or OAM may configure different interference coordination schemes for the DU for the interfered base stations with different Set IDs by analyzing the measurement result of the RIM-RS, and then the DU may simultaneously execute multiple interference coordination schemes.
When the interfering base station CU knows that the DU detects the RIM-RS through step 501, the interfering base station needs to notify the interfered base station through the backhaul signaling, the interfering base station has already received the RIM-RS, the atmospheric waveguide phenomenon still exists, and the interfered base station needs to continue transmitting the RIM-RS to monitor when the atmospheric waveguide phenomenon disappears.
Step 504: the DU of the interfering base station sends a reference signal reception indication message to the CU reporting RIM-RS reception.
And the DU on the side of the interfered base station continuously transmits the RIM-RS, if the atmospheric waveguide phenomenon still exists, the DU of the interfering base station can still detect the RIM-RS, and then the RIM-RS is reported to the CU, the CU continuously indicates the state information received by the RIM-RS to the interfered base station through the return signaling, and the interfered base station needs to continuously transmit the RIM-RS. Message 504 contains one or more of the following information:
the interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered base station set ID is present, it is also implicitly indicated that RIM-RS is detected);
RIM-RS reception (reception of RIM-RS) indication information (optional information, since when only the interfered base station set ID, it implicitly indicates that RIM-RS was detected as well).
Cell information, such as cell identification information (NR CGI, or PCI, or index), for which RIM-RS is detected (or frequency information for which RIM-RS is detected).
If the DU detects a plurality of RIM-RSs with different set IDs at the same time, the receiving state information of the RIM-RSs with different set IDs can be reported to the CU at the same time in a list mode.
Step 505: the DU of the interfering base station sends a reference signal disappearance indication message to the CU reporting the RIM-RS disappearance.
And the DU on the side of the interfered base station continuously transmits the RIM-RS, and if the atmospheric waveguide phenomenon disappears and all cells under the DU of the interfered base station cannot detect the state of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU.
Message 505 contains one or more of the following:
an interfered base station set ID (optional information, if the way of implicitly indicating that RIM-RS was detected when only interfered base station set ID is used, then also the implicit indication of disappearance of RIM-RS when there is no interfered base station set ID can be used);
-RIM-RS disappearance (missing of RIM-RS) indication information (optional information, if the way that RIM-RS is detected is used with implicit indication when only interfered base station set ID is available, then also implicit indication of disappearance of RIM-RS when there is no interfered base station set ID) can be used.
Cell information of RIM-RS disappearance, such as cell identification information (NR CGI, or PCI, or index) (or cell frequency information of RIM-RS disappearance).
If the DU initially detects RIM-RSs of different set IDs at the same time, the RIM-RSs that now change to some or all set IDs are not detected, and the disappearance status information of RIM-RSs of different set IDs can be reported to the CU at the same time in a list manner.
Since there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, and there are multiple cells under each DU. And when all the cells under the DU cannot detect the state of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU, and similarly, when all the cells under the CU cannot detect the state of the RIM-RS, the CU can indicate the state information of the disappearance of the RIM-RS to the interfered base station through a return signaling. The interfered base station then stops transmitting the RIM-RS.
Step 506: and the CU of the interference base station sends an interference coordination scheme ending indication message to the DU, and indicates the DU to end the interference coordination scheme.
And when all the cells under the interference base station DU can not detect the states of the RIM-RS, reporting the state information of the disappearance of the RIM-RS to the CU by the DU, and then indicating the DU to end the interference coordination scheme by the CU. Message 506 contains one or more of the following information:
end interference coordination scheme indication information (if the DU detects RIM-RSs of multiple different set IDs simultaneously and executes multiple interference coordination schemes simultaneously, it needs to indicate which set ID corresponds to the coordination scheme that needs to be ended, i.e. carries identification information of the interference coordination scheme);
-identification information of an interference coordination scheme;
cell information, such as cell identification information (NR CGI, or PCI, or index), to end the interference coordination scheme (optional information, cell information that may directly indicate to end the interference coordination scheme if the CU already knows the cell information to initiate execution of the interference coordination scheme).
Another way that can be taken is that the DU knows which cells are performing the interference coordination scheme, when all cells do not receive the RIM-RS, indicating that the atmospheric wave guide phenomenon does not exist for the area covered by all cells under this DU, the DU can decide to end the interference coordination scheme and then inform the CU.
Step 507: and the DU of the interference base station sends a response message of ending the interference coordination scheme to the CU, and indicates that the DU has ended the interference coordination scheme.
The message DU of step 506 is indicated by the CU, and the interference coordination scheme is ended. The DU may then send a response message to the CU to indicate a friendly procedure to end the interference coordination scheme. The message in step 507 contains one or more of the following information:
response information of ending interference coordination scheme if the DU detects RIM-RSs of multiple different set IDs simultaneously and executes multiple interference coordination schemes simultaneously, it needs to indicate which set ID corresponds to the coordination scheme that has ended, i.e. carries identification information of the interference coordination scheme);
-identification information of an interference coordination scheme.
When all cells under the interfering base station DU can not detect the state of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU, then the DU can decide to finish executing the interference coordination scheme by itself without the CU executing the step 506 to instruct the DU to finish the interference coordination scheme, and then the message is sent to the CU. In this case, the message of step 507 contains the following information:
DU end interference coordination scheme notification information (if the DU detects RIM-RSs with different set IDs simultaneously and performs multiple interference coordination schemes simultaneously, it needs to indicate which set ID corresponding coordination scheme is ended, i.e. carries identification information of the interference coordination scheme);
-identification information of an interference coordination scheme.
If a CU, after having been reported by the DU that detects a RIM-RS, also indicates that an interference coordination scheme is applied on nearby DUs where no RIM-RS is detected, for the stopping of these DU interference coordination schemes the stopping of the interference coordination scheme has to be triggered by the CU by performing step 506 and step 507. Since these DUs do not detect RIM-RS, and certainly when it disappears, the CU is required to control the execution and stopping of the interference coordination scheme.
And when the DU finishes executing the interference coordination scheme and restores the initial configuration, stopping monitoring the RIM-RS.
Steps 501 to 507 in fig. 5 may be performed in the order shown in fig. 5, or may be performed in other orders, and each of the above steps may be performed alone, or any two or more steps may be performed in combination.
In one embodiment, only 504 is performed, and further, this step may be performed when the interfering base stations DU and OAM or the interfering base stations CU and OAM are connected.
In one embodiment, only 505 is performed, and further, this step may be performed when the interfering base station DU is connected with OAM, or the interfering base station CU is connected with OAM.
In one embodiment, only 507 is performed to end the interference coordination scheme notification, further this step may be performed when the interfering base station DU is connected with OAM, or the interfering base station CU is connected with OAM.
In one embodiment, 506 and 507 are performed, and further, this step may be performed when the interfering base stations DU and OAM or the interfering base stations CU and OAM are connected.
In one embodiment, only the interference coordination scheme execution notification is executed 503, further this step may be executed when the interfering base station DU is connected with OAM.
In one embodiment, 501 and 502 are performed, further this step may be performed when the interfering base stations DU and OAM or the interfering base stations CU and OAM are connected.
In one embodiment, 501, 502 and 503 are performed, further, this step may be performed when the interfering base station DU is connected with OAM, or the interfering base station CU is connected with OAM.
FIG. 6 depicts embodiment three of the present invention. The prototype is based on fig. 2, and after a conventional base station in a frame 2.1 diagram proposed for RAN WG1 is separated into a base station centralized control unit CU and a base station distribution unit DU, it is assumed that the DU obtains configuration information of RIM-RS from OAM, and the DU obtains configuration of an interference coordination scheme from OAM, without exchanging information such as detection of remote interference, configuration of RIM-RS, detection of RIM-RS, configuration information of an interference coordination (coordination) scheme, and the like on an F1 interface. The working process is as follows:
step 0: atmospheric wave guide phenomena occur and remote interference occurs.
Step 1: when the local base station DU detects that the IoT noise around rises above the threshold during uplink reception, it means that the local base station is interfered by a remote base station in a certain area, which is called as an interfered base station, and the remote interfering base station is called as an interfering base station. The base station may be a 5G base station, or an LTE base station, or a base station in other access modes, and this embodiment takes the 5G base station gNB as an example, and if the base station is used in other systems, the corresponding interfaces and message names are also changed accordingly. And then the DU and OAM at the side of the interfered base station interact to obtain the configuration information of the RIM-RS, or the RIM-RS can be configured by the user according to the pre-configured set ID, and the RIM-RS is started to transmit. And simultaneously, the side DU of the interference base station directly starts RIM-RS monitoring under OAM configuration.
Step 2: when the remote interfering base station receives the RIM reference signal (RIM-RS), it will inform the local interfered base station through the backhaul network that the RIM-RS has been received and the local interfered base station keeps on transmitting the RIM-RS. The information of the RIM-RS is detected to be obtained at the DU side of the interfering base station first, however, the CU of the interfering base station is connected to the 5G core network element, and the CU is responsible for notifying the interfered base station that the RIM-RS has received the information through the backhaul network, and at this stage, the content of the specification for the RIM framework 2.1 does not relate to how the base station handles the problem under the CU-DU split architecture. By using the method of the invention for interfering the base station side, the central unit equipment of the base station receives the information about the receiving state of the reference signal sent by the distributed unit equipment of the base station, wherein the information about the receiving state of the reference signal comprises RIM-RS receiving indication information. The DU needs to be signaled to the CU via the F1 interface before the CU can transmit information back to the interfered base station side via the backhaul network. It is assumed that the DU and OAM can interactively acquire the interference coordination scheme and start application without notifying the CU.
And when the interfered base station receives the state information of the RIM-RS received by the indication forwarded from the backhaul network, the interfered base station determines to continuously transmit the RIM-RS. However, the interfered base station side CU is connected to the 5G core network element, and the return network CU first obtains the reception indication information of the reference signal, and the DU is responsible for transmission of the reference signal. The specification content for RIM framework 2.1 at this stage does not concern how the base station handles this problem under CU-DU split architecture. By using the method of the interfered base station side of the invention, the distribution unit equipment of the base station receives the information which is sent by the concentration unit equipment of the base station and is related to the receiving state of the reference signal, wherein the information related to the receiving state of the reference signal comprises the RIM-RS receiving indication information. The CU can send a message to the DU indicating the RIM-RS reception status to the DU and the DU decides to continue transmitting RIM-RS, or directly instruct the DU to continue transmitting RIM-RS to monitor when the atmospheric waveguiding phenomenon disappears. This indication message is not necessary because the DU is already in a state of transmitting RIM-RS, and the RIM-RS will continue to be transmitted if the mechanism on the DU side is to not receive the RIM-RS disappearance indication or stop transmitting RIM-RS indication information. If there is a corresponding timer mechanism on the DU side, the DU stops transmitting RIM-RS if the timer has not received the RIM-RS reception indication or continues to transmit the RIM-RS indication information before the timer expires, so that this indication message is mandatory.
And step 3: when the remote interference base station can not receive the RIM-RS, the remote interference base station informs the local interfered base station that the RIM-RS disappears through a backhaul network. Similarly, the information that the RIM-RS cannot be detected is firstly obtained at the DU side, however, the CU of the interfering base station is connected to the 5G core network element, and the CU is responsible for notifying the information that the local interfered base station RIM-RS cannot receive through the backhaul network, and at present, the content of the specification for the RIM framework 2.1 does not relate to how the base station handles the problem under the CU-DU split architecture. By using the method of the invention for interfering the base station side, the central unit equipment of the base station receives the information which is sent by the distributed unit equipment of the base station and is related to the receiving state of the reference signal, wherein the information related to the receiving state of the reference signal comprises RIM-RS disappearance indication information. The DU needs to be signaled to the CU via the F1 interface before the CU can transmit information back to the interfered base station side via the backhaul network. Assuming that the DU does not monitor the RIM-RS, the application of the direct de-interference coordination scheme reverts to the previous state and directly stops detecting the RIM-RS, and the CU does not need to be notified.
And 4, step 4: and after receiving the indication that the RIM-RS disappears, the local interfered base station stops transmitting the RIM-RS. The interfered base station side CU firstly receives indication information of RIM-RS disappearance transmitted through the backhaul network, and the DU is responsible for stopping transmitting the reference signal. The specification content for RIM framework 2.1 at this stage does not concern how the base station handles this problem under CU-DU split architecture. By using the method of the interfered base station side of the invention, the distribution unit equipment of the base station receives the information which is sent by the concentration unit equipment of the base station and is related to the receiving state of the reference signal, wherein the information related to the receiving state of the reference signal comprises RIM-RS disappearance indication information. The CU needs to signal the DU over the F1 interface, indicating the RIM-RS disappearance status to the DU and the DU decides to stop transmitting RIM-RS, or directly indicating the DU to stop transmitting RIM-RS.
Summarizing the above process, it can be found that, for a CU-DU split base station, the F1 interface message necessary for completing the whole RIM mechanism is as follows, and the information transferred to the DU by the CU on the interfered base station side includes at least one of the following:
■ reference signal identification information (if the DU transmits multiple RIM-RSs simultaneously, it needs to indicate which RIM-RS to continue or stop transmitting);
■ RIM-RS receiving indication (reception of RIM-RS) information;
■ continuing to transmit RIM-RS indication information;
■ continuing to transmit information on the cell or frequency in which the reference signal is located;
■ RIM-RS disappearance indication (dispearance of RIM-RS) information;
■ stopping transmitting RIM-RS indication information;
■ stop transmitting information on the cell or frequency in which the reference signal is located.
The information transferred to the CU for the interfering base station side DU contains at least one of:
■ reference the identification information of the signal (if the DU detects multiple RIM-RSs simultaneously, it needs to indicate which RIM-RS is in a received or disappeared state);
■ RIM-RS receiving indication (reception of RIM-RS) information;
■ detecting the information of the cell or frequency where the RIM-RS is located;
■ RIM-RS disappearance indication (dispearance of RIM-RS) information;
■ no RIM-RS can be detected, i.e. the cell or frequency information where RIM-RS disappears;
■ interfered BS set ID (obtained by demodulating RIM-RS) (when only interfered set ID is available, it is also implicitly indicated that RIM-RS is detected) (if the ID information of reference signal includes interfered BS set ID, it is not necessary to inform CU of this information);
■ interfering base station set ID (OAM configured to DU, or DU pre-configured with set ID. if using optional backhaul scheme Solution 1 mentioned in specification TR38.866 to transmit the detection or disappearance information of RIM-RS to the interfered base station, and not notified to CU by other means such as F1Setup procedure before, or even if notified before but if the information is updated, the CU must notify this information);
■ one or more tracking area identity ID/base station global identity ID information (DU and OAM interworking query results in one or more tracking area identity ID/base station global identity ID information mapped by the interfered base station set ID, CU must be informed if this information is transmitted over the backhaul network to the interfered base station using alternative Solution 2 mentioned in specification TR38.866 to detect or disappear RIM-RS).
FIG. 7 depicts embodiment four of the present invention. Fig. 7 depicts the overall process triggered by the detection of remote interference by the interfered base station. The base stations are separated into a base station centralized control unit CU and a base station distribution unit DU, to which one CU can be connected. The base station may be a 5G base station, or an LTE base station, or a base station in other access modes, and this embodiment takes the 5G base station gNB as an example, and if the base station is used in other systems, the corresponding interfaces and message names are also changed accordingly. This embodiment assumes that a CU can configure the interference coordination (interference) scheme autonomously, if the CU gets the configuration information of the RIM-RS from the OAM, or the CU gets the interference coordination scheme from the OAM and sends it to the DU. And assumes that the interfering base station and the interfered base station are located on the same AMF. And supposing that the interfered base station is only interfered by the interfering base station in one remote area, only transmitting the RIM-RS of one set ID at the DU side of the interfered base station, the interfering base station only generates remote interference on the interfered base station in one area, and only detecting the RIM-RS of one set ID at the DU side of the interfering base station.
In step 700, CU sends message to DU, and configures DU to carry out remote interference measurement.
The remote interference measurement configuration may be OAM configured to the CU or may be self-generated by the CU. The CU then sends a measurement configuration message of the remote interference to the DU, the message containing one or more of the following information:
-measurement methods (e.g. measuring the average of the remote interference noise suffered by a symbol in an uplink subframe over a certain time);
-reporting a threshold or reporting a condition, the DU requiring reporting of the measurement result to the CU if the remote interference measurement result of the DU exceeds the threshold, or the DU reporting the remote interference measurement result to the CU according to the reporting condition.
Or for the detection of the remote interference, the DU may distinguish by an interference characteristic (when a cell or cells on the DU monitor, at an air interface, that a symbol (symbol) in an uplink subframe is suffering from thermal noise interference (IoT), and exhibit a state in which noise power gradually decreases from high to low as a symbol time domain expands, indicating that the noise is caused by the remote interference), so that the DU may start the measurement configuration by itself, and the CU does not need to send a message to trigger the DU to perform the measurement of the remote interference, that is, the step 700 does not need to be performed.
The DU configures a remote interference threshold in advance, and if the remote interference exceeds a set threshold (the threshold may be an absolute value of the remote interference such as how many dBm or a relative value such as a minimum SNR required for uplink demodulation), the DU triggers a remote interference coordination mechanism, or the DU receives the configuration of the CU, and performs remote interference measurement according to the configuration information of the CU, that is, the DU receives the message of step 700 and performs remote interference measurement according to the information carried in the message.
Step 701: the interfered base station DU sends a message to the base station CU reporting the detection of remote interference.
When the DU detects remote interference, the DU sends a message 701 to the CU to report the remote interference, where the message 701 carries one or more of the following information:
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (such as interference noise power value, number of interfered symbols, signal-to-noise ratio when demodulating interfered symbols, etc.) of each interfered cell.
The information carried by message 701 may be only the DU identity information base station DU ID that detected the remote interference, or also the cell information that detected the remote interference. If only the DU identification information is carried, the DU side has cell information for detecting remote interference, so that after subsequent CU and OAM interaction obtain the RIM-RS configuration information, the interfered DU is also instructed to start transmitting the RIM-RS, or the DU which does not detect remote interference is also instructed to start transmitting the RIM-RS. After the DU is indicated, it is decided that RIM-RS will be transmitted on the interfered cell or all cells under the DU. If the DU reports cell information that remote interference is detected to the CU as well, the CU, after obtaining the RIM-RS configuration, can directly indicate on which cells on which DU the RIM-RS is transmitted. This embodiment assumes that there is interfered cell information on the CU side and the CU can directly indicate on which cells the DUs transmit RIM-RS.
And the CU reports the remote interference detection information to the OAM and requests to acquire RIM-RS configuration, wherein the RIM-RS configuration information comprises an interfered base station set ID and is used for transmitting time-frequency resource information of the RIM-RS.
Step 702: the interfered base station CU sends a RIM-RS configuration message to the base station DU instructing the DU to start transmitting RIM-RS.
After having the RIM-RS configuration information, the interfered base station CU sends a message to the interfered base station DU, wherein the message contains the configuration information of the RIM-RS, or possibly also contains the DU and the cell information for transmitting the RIM-RS. Information 702 carries one or more of the following:
-interfered base station set ID (OAM configured to CU);
-RIM-RS configuration information (OAM configured to CU);
-indication information to initiate transmission of RIM-RS;
cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to transmit RIM-RS if CU already knows cell information to detect remote interference in step 701).
When a DU discovers remote interference, it may be necessary for a DU near the DU to transmit the same RIM-RS signal in order to increase the signal energy for transmitting the RIM-RS, the DU informs the CU that the DU discovers remote interference, the CU determines the configuration information (or OAM configuration to the CU) of the RIM-RS, and sends the RIM-RS configuration information to all corresponding DUs.
And after the DU obtains the indication of the CU, the DU determines to transmit the RIM-RS by using the configured time-frequency resources on the cell which detects the remote interference or on all cells under the DU if the CU does not specify the cell. The DU may then send a response message to the CU initiating transmission of the RIM-RS.
Step 703: the interfered base station DU sends a message to the CU. The message carries the following information:
-response information to start transmitting RIM-RS (CU instructs DU to transmit RIM-RS, CU is informed by this information when DU execution succeeds or fails)
Since there are multiple DUs in the same area, and there are some CUs that may be deployed under different bss, the DU detecting remote interference and the connected CU perform the above steps, and then the DU gets the same interfered bs set ID, the same time-frequency resource indication for transmitting RIM-RS, and starts RIM-RS transmission.
When the interfered base station CU obtains the configured interfered base station set identifier (interfered base station set ID) information from the OAM, it may need to send the interfered base station set ID information to the core network node AMF connected to the CU.
After acquiring the ID of the interfered base station set from the RIM-RS received by the DU, the interfering base station CU needs to notify the interfered base station of the state information received by the RIM-RS through a return path. Firstly, the interfered base station CU sends the state information and the interfered base station set ID information received by the RIM-RS to the AMF, and the AMF needs to know which base stations are in the interfered base station set ID, so the AMF needs to acquire the base station identifier, i.e. the base station ID, included in the interfered base station set ID by using the step 704.
Step 704: the interfered base station CU sends a message to the AMF.
The CU reports the configured interfered bss ID information to the AMF via the Ng interface, where the information 704 includes one or more of the following information:
-a set of interfered base stations ID;
-base station ID.
Step 705: and the CU of the interference base station sends a message to the DU to indicate the monitoring RIM-RS.
The DU may initiate RIM-RS detection based on measurement configuration messages received from CUs. The information related to the RIM-RS measurement configuration may be OAM configured to the CU, or may be sent to the CU of the interfering base station through backhaul kaul signaling by using the interfering base station set ID and the interfered set ID preset before when the interfered base station detects the remote interference. The configuration information contains one or more of the following:
measurement method (periodic monitoring of signals at specified time-frequency locations);
reporting a threshold or reporting a condition that the DU needs to report the measurement to the CU if the DU RIM-RS measurement exceeds the threshold, or reporting the DU RIM-RS measurement to the CU according to the reporting condition.
Step 706: the DU of the interfering base station sends a message to the CU reporting the detection of the RIM-RS.
In step 702, the interfered base station-DU starts transmitting the RIM-RS in the air after receiving the indication of transmitting the RIM-RS. Similarly, through the atmospheric waveguide phenomenon, a base station (agressor gNB) causing remote interference can also receive the RIM-RS at the air interface. When the DU of the interfering base station detects the RIM-RS at the air interface for the first time, the DU reports the RIM-RS message monitored by the CU, and the message 706 includes one or more of the following information:
interfered base station Set ID (acquired by demodulating RIM-RS) (when only Victim gbb Set ID, it is also implicitly indicated that RIM-RS was detected);
RIM-RS reception (reception of RIM-RS) indicates optional information, since when there is only the Victim gbb SetID, it implicitly also indicates that RIM-RS was detected);
an interference coordination scheme request (optional information, when carrying measurement result information of the DU-side RIM-RS, the CU selects a suitable interference coordination scheme according to the measurement result or the CU gets the interference coordination scheme from OAM);
cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
cell measurement results (e.g. information of RIM-RS power value, time delay, etc.) of each detected RIM-RS.
The information carried by message 706 may be the base station DU ID which carries only the DU identity information that the RIM-RS was detected. Or also carries cell information for which RIM-RS was detected. If only the DU identification information is carried, the DU side has cell information for detecting the RIM-RS, and after the subsequent CU and OAM interact to obtain the interference coordination scheme, the subsequent CU also instructs the DU, which has detected the RIM-RS, to start executing the interference coordination scheme, or, of course, instructs the DU, which has not detected the RIM-RS, to execute the interference coordination scheme. After the DU is instructed, an interference coordination scheme is performed on the cell where the RIM-RS is detected or on all cells under the DU. If the DU reports cell information that the RIM-RS was detected to the CU as well, the CU can directly indicate on which cells on which DU the interference coordination scheme is performed when the interference coordination scheme is acquired. This embodiment assumes that there is cell information on the CU side that the RIM-RS is detected, and the CU can directly instruct the DU on which cells to perform the interference coordination scheme.
And then, the CU and the OAM of the interference base station interact to obtain an implemented interference coordination scheme and a configured interference base station set ID. Or the CU may itself decide the interference coordination scheme to implement and utilize the pre-configured interfering base station set ID.
Step 707: the CU of the interfering base station sends a message to the DU instructing the DU to perform an interference coordination scheme.
The interfering base station CU sends a message to this base station DU, the message of step 707 indicating which interference coordination scheme the DU starts to perform. This message contains one or more of the following information:
interfering base station set ID (OAM configured to CU or pre-configured by CU)
-indication information to perform an interference coordination scheme;
configuration information of interference coordination schemes, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the research progresses) (which may be OAM configured to the CU, or which may be configured by the CU according to RIM-RS measurements):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information, such as cell identification information (NR CGI, or PCI, or index), to perform the interference coordination scheme (optional information, which may directly indicate cell information to perform the interference coordination scheme if the CU knows at step 706 that the cell information of the RIM-RS was received).
When a DU detects a RIM-RS, it may be necessary for the DUs near the DU to execute the same interference coordination scheme in order to expand the execution range of the interference coordination scheme, and the DU notifies the CU that the DU finds the RIM-RS, and the CU determines configuration information of the interference coordination scheme and transmits the configuration information of the interference coordination scheme to all corresponding DUs.
After receiving the configuration information of the interference coordination scheme, the interfering base station DU starts to execute the interference coordination scheme on the cell indicated by the CU. If the CU does not have cell information indicating that the DU performs an interference coordination scheme, the DU may perform the interference coordination scheme on the cell in which the RIM-RS is detected or on all cells under the DU. The DU may then send response information to the CUs to perform the interference coordination scheme.
Step 708: the DU of the interfering base station sends a message to the CU. The message carries the following information:
-response information to perform the interference coordination scheme.
Since there are multiple DUs that detect the RIM-RS in the same area, and some DUs may be deployed in CUs under different bss, the DUs that detect the RIM-RS and the connected CUs perform the above steps, and then the DUs obtain the same interfering bss ID, corresponding interference coordination scheme configuration information, and start execution of the interference coordination scheme.
Step 709: the CU of the interfering base station sends a message to the AMF.
When the CU knows from the DU, the DU detects the RIM-RS, which indicates that the atmospheric waveguide phenomenon exists between the interference base station and the interfered base station, the interference base station needs to inform the interfered base station through a return signaling, the interference base station already receives the RIM-RS, the atmospheric waveguide phenomenon still exists, and the interfered base station needs to continuously send the RIM-RS, so that the interference base station can continuously monitor when the atmospheric waveguide phenomenon disappears, and if the interference base station cannot receive the RIM-RS, the atmospheric waveguide phenomenon is proved to disappear. The message of step 709 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-RIM-RS receiving (receipt of RIM-RS) indication information.
Since there are multiple interfering bss under each interfering bss ID, there are multiple DUs under each interfering bs, each DU sends a message to the CU when detecting the RIM-RS, and if the CU initiates step 709 to send a message to the AMF each time it receives a report that the DU detects the RIM-RS, the signaling load of the Ng interface is increased. The CU of the interfering base station sends only one message to the AMF reporting that the base station detected the RIM-RS.
Step 710: the AMF forwards the message to the CUs of the interfered base station.
When the AMF receives the request from the interfering bs, it forwards the RIM-RS reception status information to the bs included in the target interfered bs set ID, and then, through step 704, the AMF already knows the bs information included in the interfered bs set ID, so it forwards the information to the CU of the interfered bs. Message 710 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-RIM-RS receiving (receipt of RIM-RS) indication information.
Step 711: the CU of the interfered base station sends a message to the DU instructing to continue transmitting the RIM-RS.
When the CU of the interfered base station receives the status information forwarded from the AMF indicating the reception of the RIM-RS, the CU may send a message to the DU indicating the reception status of the RIM-RS to the DU and then the DU decides to continue to transmit the RIM-RS, or directly instruct the DU to continue to transmit the RIM-RS to monitor when the atmospheric wave guide phenomenon disappears. This indication message is not necessary because the DU is already in a state of transmitting RIM-RS, and the RIM-RS will continue to be transmitted if the mechanism on the DU side is to not receive the RIM-RS disappearance indication or stop transmitting RIM-RS indication information. If there is a corresponding timer mechanism on the DU side, the DU stops transmitting RIM-RS if the timer has not received the RIM-RS reception indication or continues to transmit the RIM-RS indication information before the timer expires, so that this indication message is mandatory. The message contains the following first information or second and third information:
-RIM-RS receiving (receipt of RIM-RS) indication information;
-continuing to transmit indication information of the RIM-RS;
cell information to continue transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to continue transmitting RIM-RS if CU already knows cell information to start transmitting RIM-RS).
When the DU gets the status information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS and the DU can decide that these cells continue to transmit the RIM-RS.
Step 712: the DU of the interfering base station sends a message to the CU reporting RIM-RS reception.
The DU on the interfered base station side continues to transmit the RIM-RS, if the atmospheric wave guide phenomenon still exists, the DU of the interfering base station can still detect the RIM-RS, and then reports the RIM-RS to the CU, and then the process continues to execute step 709 and step 710 to indicate the status information received by the RIM-RS to the CU of the interfered base station through the return signaling, and then the DU of the interfered base station is instructed to continue to transmit the RIM-RS through the optional step 711. Message 712 contains one or more of the following information:
the interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered base station set ID is present, it is also implicitly indicated that RIM-RS is detected);
RIM-RS reception (reception of RIM-RS) indication information (optional information, since when only the interfered base station set ID, it implicitly indicates that RIM-RS was detected as well).
Step 713: the DU of the interfering base station sends a message to the CU reporting the RIM-RS disappearance.
And the DU on the side of the interfered base station continuously transmits the RIM-RS, and if the atmospheric waveguide phenomenon disappears and all cells under the DU of the interfered base station cannot detect the state of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU. Message 713 contains one or more of the following information:
an interfered base station set ID (optional information, if the way of implicitly indicating that RIM-RS was detected when only interfered base station set ID is used, then also the implicit indication of disappearance of RIM-RS when there is no interfered base station set ID can be used);
-RIM-RS disappearance (missing of RIM-RS) indication information (optional information, if the way that RIM-RS is detected is used with implicit indication when only interfered base station set ID is available, then also implicit indication of disappearance of RIM-RS when there is no interfered base station set ID) can be used.
Since there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, and there are multiple cells under each DU. And in the same way, when all the DUs under the DU cannot detect the RIM-RS state, the CU triggers the step 716 to report the state information of the RIM-RS disappearance to the AMF.
Step 714: the CU of the interfering base station sends a message to the DU instructing to end the interference coordination scheme.
And when all the cells under the interference base station DU can not detect the states of the RIM-RS, reporting the state information of the disappearance of the RIM-RS to the CU by the DU, and then indicating the DU to end the interference coordination scheme by the CU. Message 714 contains one or more of the following information:
-end interference coordination scheme indication information;
cell information, such as cell identification information (NR CGI, or PCI, or index), to end the interference coordination scheme (optional information, cell information that may directly indicate to end the interference coordination scheme if the CU already knows the cell information to initiate execution of the interference coordination scheme).
Another way that can be taken is that the DU knows which cells are performing the interference coordination scheme, when all cells do not receive the RIM-RS, indicating that the atmospheric waveguide phenomenon does not exist for the area covered by all cells under this DU, the DU can decide to end the interference coordination scheme and stop monitoring the RIM-RS, and then send an end interference coordination scheme indication message to the CU.
Step 715: the DU of the interfering base station sends a response message to the CU indicating that the DU has finished the interference coordination scheme.
The message DU of step 714 indicates the CU, and the interference coordination scheme is ended. The DU may then send a response message to the CU to indicate a friendly procedure to end the interference coordination scheme. The message in step 715 contains the following information:
-response information to end the interference coordination scheme.
When all cells under the interfering base station DU cannot detect the states of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU through step 713, and then the DU can decide to end the execution of the interference coordination scheme by itself without the CU executing step 714 to instruct the DU to end the interference coordination scheme, and then sends a message to notify the CU. In this case the message of step 715 contains the following information:
-DU end interference coordination scheme notification information.
If a CU, after having been reported by the DU that detects a RIM-RS, also indicates that an interference coordination scheme is applied on nearby DUs where no RIM-RS is detected, for the stopping of these DU interference coordination schemes the stopping of the interference coordination scheme has to be triggered by the CU by performing step 714 and step 715. Since these DUs do not detect RIM-RS, and certainly when it disappears, the CU is required to control the execution and stopping of the interference coordination scheme.
And when the DU finishes executing the interference coordination scheme and restores the initial configuration, stopping monitoring the RIM-RS.
Step 716: the CU of the interfering base station sends a message to the AMF.
When the interfering base station CU knows that all DUs cannot detect the RIM-RS status, it needs to notify the interfered base station of the missing RIM-RS status through backhaul signaling. And the interfered base station is used for judging whether the transmitted RIM-RS is received at the side of the interfering base station, if the transmitted RIM-RS is not received, the atmospheric waveguide phenomenon disappears, and the RIM-RS is required to be stopped transmitting. Message 716 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-RIM-RS-disappearance (RIM-RS) indication information.
Because there are multiple interfering base stations under each AMF, there are multiple DUs under each interfering base station, when all DUs under a CU cannot detect RIM-RS, the CU will report the AMF to indicate that RIM-RS disappears, and similarly, when all interfering base stations under the AMF cannot detect RIM-RS, step 717 will be triggered, and the AMF will forward RIM-RS disappearance indication information to the interfered base station.
Step 717: the AMF forwards the message to the CUs of the interfered base station.
When all the interfering base stations under the AMF cannot detect the RIM-RS, the AMF forwards the RIM-RS disappearance indication information to the interfered base station, and the AMF already knows the base station information contained in the interfered base station set ID through step 704, so that the information is forwarded to the CU of the interfered base station. Message 717 contains one or more of the following:
-interfering base station set ID;
-a set of interfered base stations ID;
-RIM-RS-disappearance (RIM-RS) indication information.
Step 718: the CU of the interfered base station sends a message to the DU instructing to stop transmitting the RIM-RS.
And when the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates that the RIM-RS disappears, the atmospheric waveguide phenomenon disappears, and the RIM-RS disappearing information needs to be sent to the DU, or the DU is directly indicated to stop transmitting the RIM-RS. The message contains the following first information or second and third information:
-RIM-RS disappearance (RIM-RS) indication information;
-stop transmitting indication information of RIM-RS;
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to stop transmitting RIM-RS if CU already knows to start transmitting RIM-RS).
When the DU gets the status information of the disappearance of the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, the DU can decide to stop transmitting the RIM-RS, and can then send a response message to inform the CU.
Step 719: the DU of the interfered base station sends a response message to the CU indicating that the DU has stopped transmitting RIM-RS.
If the message of step 718 carries the indication information of disappearance of RIM-RS (mismatch of RIM-RS) to the DU, the DU may send notification information of stopping transmitting RIM-RS to the CU after stopping transmitting RIM-RS. The message of step 719 contains one or more of the following information:
-the DU stops transmitting RIM-RS notification information.
If the message of step 718 carries an indication to stop transmitting the RIM-RS to the DU, after the DU stops transmitting the RIM-RS, a response message may be sent to the CU to indicate a friendly end to stop transmitting the RIM-RS. The message in step 719 contains the following information:
-ceasing to transmit the response information of the RIM-RS.
FIG. 8 depicts an embodiment five of the present invention. Fig. 8 depicts the overall procedure triggered by the detection of remote interference by the interfered base station. The base stations are separated into a base station centralized control unit CU and a base station distribution unit DU, to which one CU can be connected. The base station may be a 5G base station, or an LTE base station, or a base station in other access modes, and this embodiment takes the 5G base station gNB as an example, and if the base station is used in other systems, the corresponding interfaces and message names are also changed accordingly. This embodiment assumes that, if the DU gets the configuration information of the RIM-RS from the OAM, the DU itself can decide to configure the interference coordination mechanism or get the interference coordination scheme from the OAM. And assumes that the interfering base station and the interfered base station are located on the same AMF. And supposing that the interfered base station is only interfered by the interfering base station in one remote area, only transmitting the RIM-RS of one set ID at the DU side of the interfered base station, the interfering base station only generates remote interference on the interfered base station in one area, and only detecting the RIM-RS of one set ID at the DU side of the interfering base station.
In step 800, the CU sends a message to the DU, and the DU is configured to carry out remote interference measurement.
The remote interference measurement configuration may be OAM configured to the CU or may be self-generated by the CU. The CU then sends a measurement configuration message of the remote interference to the DU, the message containing one or more of the following information:
-measurement methods (e.g. measuring the average of the remote interference noise suffered by a symbol in an uplink subframe over a certain time);
-reporting a threshold or reporting a condition that the DU needs to report the measurement result to the CU if the DU remote interference measurement exceeds the threshold, or according to the reporting condition that the DU reports the remote interference measurement result to the CU;
-a threshold for transmitting the RIM-RS, the DU may initiate transmission of the RIM-RS if the measurement results of the DU meet the threshold.
Or for the detection of the remote interference, the DU may distinguish by an interference characteristic (when a cell or cells on the DU monitor, at an air interface, that a symbol (symbol) in an uplink subframe is suffering from thermal noise interference (IoT), and exhibit a state in which noise power gradually decreases from high to low as a symbol time domain expands, indicating that the noise is caused by the remote interference), so that the DU may start the measurement configuration by itself, and the CU does not need to send a message to trigger the DU to perform the measurement of the remote interference, that is, the step 800 does not need to be performed.
The DU pre-configures a remote interference threshold, and if the remote interference exceeds a set threshold (which may be an absolute value of the remote interference such as how many dBm or a relative value such as a minimum SNR required for uplink demodulation), the DU triggers a remote interference coordination mechanism. Or the DU receives the configuration of the CU and performs remote interference measurement according to the configuration information of the CU, that is, the DU receives the message of step 800 and performs remote interference measurement according to the information carried in the message. And after detecting the remote interference, the DU reports the remote interference detection information to the OAM and requests to acquire RIM-RS configuration, wherein the RIM-RS configuration information comprises an interfered base station set ID and is used for transmitting time-frequency resource information of the RIM-RS.
Step 801: the interfered base station DU sends a message to the base station CU reporting the detection of remote interference.
When the DU detects remote interference and obtains the configuration of the RIM-RS, if the remote interference detected by the DU is larger than the report threshold and smaller than the threshold for transmitting the RIM-RS, the DU can send a message to the CU to report the remote interference condition, and waits for the CU to indicate the DU to transmit the RIM-RS. The message carries one or more of the following:
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (such as interference noise power value, number of interfered symbols, signal-to-noise ratio when demodulating interfered symbols, etc.) of each interfered cell;
configuration information of RIM-RS (OAM configured to DU);
interfered base station set ID (OAM configured to DU).
Step 802: the interfered base station CU sends a message to the DU instructing the DU to start transmitting RIM-RS.
The interfered base station DU reports the detected remote interference to the CU, the CU sends a message to the interfered base station DU instructing the DU to start transmitting RIM-RS, and the message 802 carries one or more of the following information:
-indication information to initiate transmission of RIM-RS;
cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to transmit RIM-RS if CU knows cell information to detect remote interference at step 801).
And after the DU obtains the indication of the CU, the RIM-RS is transmitted by using the configured time-frequency resources in the cell designated by the CU. Or if the CU does not specify cell information for transmitting the RIM-RS, the DU determines to transmit the RIM-RS using the configured time-frequency resources on the cell where the remote interference is detected or the cell where the remote interference is not detected.
Step 803: the interfered base station DU sends a message to the base station CU indicating that the DU has started transmitting RIM-RS.
If the DU can decide to start the RIM-RS transmission by itself, i.e. the CU configures the RIM-RS transmission threshold in step 800, or the OAM configures the DU RIM-RS transmission threshold and the RIM-RS configuration information, the remote interference result of the DU detection satisfies the RIM-RS transmission threshold (the threshold may or may not be satisfied), the DU decides to start the RIM-RS transmission, and steps 801 and 802 may not be executed. Directly from step 800, execution proceeds to step 803. The DU may inform the CU of the configuration information of the RIM-RS (OAM configured to the DU) decided by the DU by means of the message of step 803. The message of step 803 carries one or more of the following information:
cell information such as cell identification information (NR CGI, or PCI, or index) where remote interference is detected (optional information, CU stores cell information where remote interference is detected);
interference measurement results (optional information, such as interference noise power value, number of interfered symbols, signal-to-noise ratio when demodulating interfered symbols, etc.) for each interfered cell;
-DU start-up transmitting RIM-RS notification information;
-cell information to initiate transmission of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information to transmit RIM-RS);
-configuration information (OAM configured to the DU) of RIM-RS;
-interfered base station set ID (OAM configured to DU).
When a DU finds remote interference and a DU near the DU may be required to transmit the same RIM-RS signal in order to increase the signal energy for transmitting the RIM-RS, the DU informs the CU of the RIM-RS configuration information determined by the DU (OAM configured to the DU), and the CU needs to forward the RIM-RS configuration information to other DUs.
This message may be the response message of step 802 if the DU initiates transmission of the RIM-RS based on the message of step 802. In this case, the message of step 803 contains one or more of the following information:
-initiating transmission of a response message to the RIM-RS (if the CU instructs the DU to transmit the RIM-RS, the CU is informed of this message when the DU has performed successfully or fails).
For step 802 if the DU gets the CU indication to transmit RIM-RS, or for step 803 if the DU can decide to transmit RIM-RS by itself, the DU will transmit RIM-RS using configured time-frequency resources on the cell where remote interference is detected or on all cells under the DU. Since there are multiple DUs in the same area, and there are some CUs that may be deployed under different bss, the DU detecting remote interference and the connected CU perform the above steps, and then the DU gets the same interfered bs set ID, the same time-frequency resource indication for transmitting RIM-RS, and starts RIM-RS transmission.
When the interfered base station CU obtains the configured interfered base station set ID information from DU, it may need to send the interfered base station set ID information to the core network node AMF connected to CU.
After acquiring the ID of the interfered base station set from the RIM-RS received by the DU, the interfering base station CU needs to notify the interfered base station of the state information received by the RIM-RS through a return path. Firstly, the interfered base station CU sends the state information and the interfered base station set ID information received by the RIM-RS to the AMF, and the AMF needs to know which base stations are in the interfered base station set ID, so the AMF needs to acquire the base station identification base station ID contained in the interfered base station set ID by using the step 804.
Step 804: the interfered base station CU sends a message to the AMF.
The CU reports the configured interfered bss ID information to the AMF via the Ng interface, where the information 804 includes one or more of the following information:
-a set of interfered base stations ID;
-base station ID.
Step 805: and the CU of the interference base station sends a message to the DU to indicate the monitoring RIM-RS.
The DU may initiate RIM-RS detection according to a measurement configuration message received from the CU, and the information related to RIM-RS measurement configuration may be OAM configuration configured for the CU, or may be sent by the interfered base station to the CU of the interfering base station through backhaul kaul signaling by using the interfering bs set ID and the interfered bs set ID preset before after detecting remote interference. The configuration information contains one or more of the following:
measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting a threshold or reporting condition, the DU requiring reporting of the measurement to the CU if the RIM-RS measurement of the DU exceeds the threshold, or reporting the RIM-RS measurement to the CU according to the reporting condition;
-a threshold for performing an interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if its RIM-RS measurements satisfy the threshold.
Or the DU directly obtains the measurement configuration of the RIM-RS from the OAM, starts monitoring of the RIM-RS, and does not need the CU to send a message to trigger the DU to perform detection of the RIM-RS, i.e. does not need to perform step 800.
After the interfered base station DU detects the remote interference, the RIM-RS is configured and starts to transmit at the air interface, and similarly, through the atmospheric waveguide phenomenon, the base station (agressor gNB) causing the remote interference can also receive the RIM-RS at the air interface. When a DU of an interference base station detects the RIM-RS for the first time at an air interface, the DU reports the monitored RIM-RS information to the OAM, and obtains a configured interference coordination scheme and an allocated interference base station set ID from the OAM, or the DU can also configure the interference coordination scheme and utilize a pre-configured interference base station set ID by itself.
Step 806: the DU of the interfering base station sends a message to the CU reporting the detection of the RIM-RS.
When the DU of the interfering base station detects the RIM-RS at the air interface for the first time, if the RIM-RS measurement result of the DU exceeds a reporting threshold (the threshold may be an absolute value of RIM-RS power, such as how many dBm), the DU needs to report to the CU, and the message 806 includes one or more of the following information:
the interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered base station set ID is present, it is also implicitly indicated that RIM-RS is detected);
RIM-RS reception (reception of RIM-RS) indication (optional information, since when only interfered base station set ID is present, it implicitly also indicates RIM-RS detected);
cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
cell measurement results (optional information, such as RIM-RS power values, time delays, etc.) for each detected RIM-RS;
interference coordination scheme information of DU configuration, one or more of the following interference coordination schemes (without excluding interference coordination schemes newly incorporated into the specification as the research advances) (configuration of the interference coordination scheme may be OAM configured to the DU, and may also be DU self-configured):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Interfering base station set ID (OAM may be configured to DU, also DU may be preconfigured with set ID).
Step 807: the CU of the interfering base station sends a message to the DU instructing the DU to start executing the interference coordination scheme.
The interfering base station CU sends a message to the base station DU instructing the DU to start executing the configured interference coordination scheme. This message contains one or more of the following information:
-indication information to perform an interference coordination scheme;
cell information, such as cell identification information (NR CGI, or PCI, or index), to perform the interference coordination scheme (optional information, cell information to perform the interference coordination scheme may be directly indicated if the CU knows at step 806 that the cell information of the RIM-RS was received).
The interfering base station DU starts to perform the interference coordination scheme on the cell indicated by the CU after receiving the message 807. The DU may perform the interference coordination scheme on a cell in which the RIM-RS is detected or on a cell in which the RIM-RS is not detected if the CU does not have cell information indicating that the DU performs the interference coordination scheme.
Step 808: and the DU of the interference base station sends a message to the CU, and informs the CU of interference coordination scheme information started to be executed by the DU.
When the DU detects the RIM-RS, if the DU can autonomously start to execute the interference coordination scheme, the DU does not need to request the CU any more, or the DU reports the monitored RIM-RS information to the OAM, and the configured interference coordination scheme and the allocated interference base station set ID are obtained from the OAM. And the RIM-RS measurement result of the DU detection satisfies the threshold for executing the interference coordination scheme (the threshold needs to be satisfied, or the threshold may not need to be set), then the DU will immediately start executing the interference coordination scheme, and steps 806 and 807 may not be executed, and the execution of step 808 is directly performed from step 805. The DU may inform the CUs with the message of step 808 that the DU decides (or OAM configures to the DU) configuration information of the interference coordination scheme. The message of step 808 contains one or more of the following:
cell information such as cell identification information (NR CGI, or PCI, or index) for which RIM-RS is detected (optional information, CU stores cell information for which RIM-RS is detected) (or frequency information for which RIM-RS is detected);
cell measurement results (optional information, such as RIM-RS power values, time delays, etc.) for each detected RIM-RS;
interfered base station Set ID (acquired by demodulating RIM-RS) (when only Victim gbb Set ID, it is also implicitly indicated that RIM-RS was detected);
-a RIM-RS reception (reception of RIM-RS) indication;
-DU performs interference coordination scheme notification information;
interference coordination scheme information of DU configuration, one or more of the following interference coordination schemes (without excluding interference coordination schemes newly incorporated into the specification as the research advances) (configuration of the interference coordination scheme may be OAM configured to the DU, and may also be DU self-configured):
time domain scheme, e.g. switching off the downlink symbols generating interference
-frequency domain scheme: e.g. change of transmission band BWP
-a power domain scheme: e.g. for reducing the transmission power of downlink symbols generating interference
-spatial domain: e.g. changing the beam parameter down-tilt
Cell information, such as cell identification information (NR CGI, or PCI, or index), for performing the interference coordination scheme (optional information, CU stores cell information for performing the interference coordination scheme);
interfering base station set ID (OAM may be configured to DU, also DU may be preconfigured with set ID).
When a DU detects a RIM-RS, and it may be necessary for the DUs in the vicinity of the DU to execute the same interference coordination scheme in order to expand the execution range of the interference coordination scheme, the DU notifies the CU of the configuration information of the interference coordination scheme determined by the DU (or configured by OAM for the DU), and the CU needs to forward the configuration information of the interference coordination scheme to other DUs. Or when a DU detects a RIM-RS, it may be necessary for the DUs near the DU to execute the same interference coordination scheme in order to expand the execution range of the interference coordination scheme, and the DU notifies the CU, the DU discovers the RIM-RS, the CU determines configuration information of the interference coordination scheme, and sends the configuration information of the interference coordination scheme to all corresponding DUs.
This message may be the response message of step 807 if the DU initiated the execution of the interference coordination scheme based on the message of step 807. In this case the message of step 808 contains the following information:
-response information to perform the interference coordination scheme.
Since there are multiple DUs that detect the RIM-RS in the same area, and some DUs may be deployed in CUs under different bss, the DUs that detect the RIM-RS and the connected CUs perform the above steps, and then the DUs obtain the same interfering bss ID, corresponding interference coordination scheme configuration information, and start execution of the interference coordination scheme.
Step 809: the CU of the interfering base station sends a message to the AMF.
When the CU knows from the DU, the DU detects the RIM-RS, which indicates that the atmospheric waveguide phenomenon exists between the interference base station and the interfered base station, the interference base station needs to inform the interfered base station through a return signaling, the interference base station already receives the RIM-RS, the atmospheric waveguide phenomenon still exists, and the interfered base station needs to continuously transmit the RIM-RS, so that the interference base station can continuously monitor when the atmospheric waveguide phenomenon disappears, and if the interference base station cannot receive the RIM-RS, the atmospheric waveguide phenomenon is proved to disappear. The message of step 809 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-a RIM-RS reception (reception of RIM-RS) indication.
Since there are multiple interfering bss under each interfering bss ID, there are multiple DUs under each interfering bs, each DU sends a message to the CU when detecting the RIM-RS, and if the CU initiates step 809 to send a message to the AMF each time it receives a report that the DU detects the RIM-RS, the signaling load of the Ng interface is increased. The CU of the interfering base station sends only one message to the AMF reporting that the base station detected the RIM-RS.
Step 810: the AMF forwards the message to the CUs of the interfered base station.
When the AMF receives the request from the interfering bs to forward the RIM-RS reception status information to the bs included in the target interfered bs set ID, the AMF already knows the bs information included in the interfered bs set ID through step 804, so that the AMF forwards the information to the CU of the interfered bs. Message 810 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-a RIM-RS reception (reception of RIM-RS) indication.
Step 811: the CU of the interfered base station sends a message to the DU instructing to continue transmitting the RIM-RS.
When the CU of the interfered base station receives the status information forwarded from the AMF indicating the reception of the RIM-RS, the CU may send a message to the DU indicating the reception status of the RIM-RS to the DU and then the DU decides to continue to transmit the RIM-RS, or directly instruct the DU to continue to transmit the RIM-RS to monitor when the atmospheric wave guide phenomenon disappears. This indication message is not necessary because the DU is already in a state of transmitting RIM-RS, and the RIM-RS will continue to be transmitted if the mechanism on the DU side is to not receive the RIM-RS disappearance indication or stop transmitting RIM-RS indication information. If there is a corresponding timer mechanism on the DU side, the DU stops transmitting RIM-RS if the timer has not received the RIM-RS reception indication or continues to transmit the RIM-RS indication information before the timer expires, so that this indication message is mandatory. The message contains the following first information or second and third information:
-a RIM-RS reception (reception of RIM-RS) indication;
-continuing to transmit indication information of the RIM-RS;
cell information to continue transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to continue transmitting RIM-RS if CU already knows cell information to start transmitting RIM-RS).
When the DU gets the status information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS and the DU can decide that these cells continue to transmit the RIM-RS.
Step 812: the DU of the interfering base station sends a message to the CU reporting RIM-RS reception.
The DU on the interfered base station side continues to transmit RIM-RS, if the atmospheric wave guide phenomenon still exists, the DU of the interfering base station can still detect RIM-RS, and then reports it to the CU, and then the process continues to execute step 809 and step 810 to indicate the status information received by RIM-RS to the CU of the interfered base station through the return signaling, and then the DU of the interfered base station continues to transmit RIM-RS through optional step 811. Message 812 contains the following information:
the interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered base station set ID is present, it is also implicitly indicated that RIM-RS is detected);
RIM-RS reception (reception of RIM-RS) indication (optional information, since when only the interfered base station set ID, it implicitly indicates that RIM-RS was detected as well).
Step 813: the DU of the interfering base station sends a message to the CU reporting the RIM-RS disappearance.
And the DU on the side of the interfered base station continuously transmits the RIM-RS, and if the atmospheric waveguide phenomenon disappears and all cells under the DU of the interfered base station cannot detect the state of the RIM-RS, the DU reports the state information of the disappearance of the RIM-RS to the CU. Message 813 contains one or more of the following information:
an interfered base station set ID (optional information, if the way of implicitly indicating that RIM-RS was detected when only interfered base station set ID is used, then also the implicit indication of disappearance of RIM-RS when there is no interfered base station set ID can be used);
-a RIM-RS disappearance (disappearance of RIM-RS) indication (optional information, if the way of implicitly indicating RIM-RS detected when only interfered base station set ID is utilized, then also implicit indicating disappearance of RIM-RS when there is no interfered base station set ID can be utilized).
Since there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, and there are multiple cells under each DU. And when all the cells under the DU cannot detect the RIM-RS state, the DU reports the state information of the disappearance of the RIM-RS to the CU, and similarly, when all the cells under the CU cannot detect the RIM-RS state, the CU triggers step 816 to report the state information of the disappearance of the RIM-RS to the AMF.
Step 814: the CU of the interfering base station sends a message to the DU instructing to end the interference coordination scheme.
And when all the cells under the interference base station DU can not detect the states of the RIM-RS, reporting the state information of the disappearance of the RIM-RS to the CU by the DU, and then indicating the DU to end the interference coordination scheme by the CU. Message 814 contains one or more of the following information:
-end interference coordination scheme indication information;
cell information, such as cell identification information (NR CGI, or PCI, or index), to end the interference coordination scheme (optional information, cell information that may directly indicate to end the interference coordination scheme if the CU already knows the cell information to initiate execution of the interference coordination scheme).
Another way that can be taken is that the DU knows which cells are performing the interference coordination scheme, when all cells do not receive the RIM-RS, indicating that the atmospheric waveguide phenomenon does not exist for the area covered by all cells under this DU, the DU can decide to end the interference coordination scheme and stop monitoring the RIM-RS, and then send an end interference coordination scheme indication message to the CU.
Step 815: the DU of the interfering base station sends a response message to the CU indicating that the DU has finished the interference coordination scheme.
The message DU of step 814 is indicated by the CU, and the interference coordination scheme is ended. The DU may then send a response message to the CU to indicate a friendly procedure to end the interference coordination scheme. The message in step 815 contains one or more of the following information:
-response information to end the interference coordination scheme.
And when all the cells under the interference base station DU can not detect the state of the RIM-RS, reporting the state information of the disappearance of the RIM-RS to the CU by the DU. The DU may then decide to end the execution of the interference coordination scheme itself without the CU performing step 814 instructing the DU to end the interference coordination scheme and then sending a message to the CU. In this case the message of step 815 contains the following information:
-DU end interference coordination scheme notification information.
If a CU, after having been reported by the DU that detected a RIM-RS, also indicates that an interference coordination scheme was applied on nearby DUs where no RIM-RS was detected, for these DUs the stopping of the interference coordination scheme has to be triggered by the CU by performing step 814 and step 815. Since these DUs do not detect RIM-RS, and certainly when it disappears, the CU is required to control the execution and stopping of the interference coordination scheme.
And when the DU finishes executing the interference coordination scheme and restores the initial configuration, stopping monitoring the RIM-RS.
Step 816: the CU of the interfering base station sends a message to the AMF.
When the interfering base station CU knows that all DUs do not detect the RIM-RS state, it needs to inform the interfered base station via backhaul signaling. And the interfered base station is used for judging whether the sent RIM-RS is received at the side of the interfering base station, if the sent RIM-RS is not received, the phenomenon of atmospheric waveguide disappears, and the RIM-RS is required to be stopped to be transmitted. Message 816 contains one or more of the following information:
-interfering base station set ID;
-a set of interfered base stations ID;
-an indication of RIM-RS disappearance (disparity of RIM-RS).
Because there are multiple interfering base stations under each AMF, there are multiple DUs under each interfering base station, when all DUs under a CU cannot detect RIM-RS, the CU will report the AMF to indicate that RIM-RS disappears, and similarly, when all interfering base stations under the AMF cannot detect RIM-RS, step 817 will be triggered, and the AMF will forward the RIM-RS disappearance indication to the interfered base station.
Step 817: the AMF forwards the message to the CUs of the interfered base station.
And when all the interfering base stations under the AMF can not detect the RIM-RS, the AMF forwards a RIM-RS disappearance indication to the interfered base stations. Previously, the AMF already knows the base station information contained in the interfered base station set ID, via step 804, and therefore forwards the message to the CU of the interfered base station. Message 817 contains information for one or more of the following:
-interfering base station set ID;
-a set of interfered base stations ID;
-an indication of RIM-RS disappearance (disparity of RIM-RS).
Step 818: the CU of the interfered base station sends a message to the DU instructing to stop transmitting the RIM-RS.
And when the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates that the RIM-RS disappears, the atmospheric waveguide phenomenon disappears, and the RIM-RS disappearing information needs to be sent to the DU, or the DU is directly indicated to stop transmitting the RIM-RS. The message contains the following first information or second and third information:
-a RIM-RS disappearance (disappearance of RIM-RS) indication;
-stop transmitting indication information of RIM-RS;
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU may directly indicate cell information to stop transmitting RIM-RS if CU already knows to start transmitting RIM-RS).
When the DU gets the status information of the disappearance of the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, the DU can decide to stop transmitting the RIM-RS, and can then send a response message to inform the CU.
Step 819: the DU of the interfered base station sends a response message to the CU indicating that the DU has stopped transmitting RIM-RS.
If the message of step 818 carries the indication information of disappearance of RIM-RS (mismatch of RIM-RS) to the DU, the DU may send notification information of stopping transmitting RIM-RS to the CU after stopping transmitting RIM-RS. The message of step 819 contains the following information:
-the DU stops transmitting RIM-RS notification information.
If the message of step 818 carries an indication to stop transmitting the RIM-RS to the DU, after the DU stops transmitting the RIM-RS, a response message may be sent to the CU to indicate a friendly end to stop the process of transmitting the RIM-RS. The message in step 819 contains the following information:
and stopping transmitting the response information of the RIM-RS.
Fig. 9 is a block diagram of a distribution unit of an interfered base station according to an embodiment of the present application. Referring to fig. 9, the distribution unit of the interfered base station proposed by the present application includes: a transceiver configured to receive and transmit information; and a controller configured to control the apparatus to implement the method proposed in the present invention, for example, to control the apparatus to receive information on a reference signal reception state transmitted by a central unit apparatus of a base station; and performing or stopping transmission of the reference signal based on the information on the reference signal reception state.
Fig. 10 is a block diagram of a centralized unit of interfered base stations according to an embodiment of the application. Referring to fig. 10, the centralized unit of the interfered base station proposed by the present application includes: a transceiver configured to receive and transmit information; and a controller configured to receive information related to a reference signal reception status from a central unit device of the interfering base station through a backhaul network; and controlling the device to implement the method proposed in the present invention, for example, performing transmission of information on the reference signal reception state received by the distribution unit device of the base station, so that the distribution unit device of the base station performs or stops transmission of the reference signal based on the information on the reference signal reception state.
Fig. 11 is a block diagram of a distribution unit of an interfering base station according to an embodiment of the present application. Referring to fig. 11, the distribution unit of the interfering base station proposed by the present application includes: a transceiver configured to receive and transmit information; and a controller configured to control the apparatus to implement the method proposed in the present invention, for example, to control the apparatus to transmit information on a reference signal reception state received by a central unit apparatus of a base station; and performing or stopping performing an interference coordination scheme based on the information related to the reference signal reception state.
Fig. 12 is a block diagram of a centralized unit of an interfering base station according to an embodiment of the application. Referring to fig. 12, the base station unit of the interfering base station proposed by the present application includes: a transceiver configured to receive and transmit information; and a controller configured to control the apparatus to implement the method proposed in the present invention, for example, to control the apparatus to receive information about a reference signal reception state transmitted by a distribution unit apparatus of a base station, so that the distribution unit apparatus of the base station performs or stops performing an interference coordination scheme based on the information about the reference signal reception state; and transmitting the information related to the reference signal receiving state to the centralized unit equipment of the interfered side base station through a backhaul network.
In the above-described embodiments, all operations and messages may be selectively performed or omitted. In addition, the steps in each embodiment need not be performed sequentially and the order may be changed. The information transfer may also be performed out of order, and the sequence of the information transfer may be changed.
Meanwhile, the exemplary embodiments of the present invention shown and described in the specification and the drawings correspond to specific examples presented for easily explaining technical contents of the present invention and for helping understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it is apparent to those skilled in the art to which the present invention pertains that various modifications can be implemented based on the technical spirit of the present invention.
Claims (14)
1. A method for a distributed unit device of a base station, the method comprising:
receiving information on a reference signal reception state transmitted by a central unit device of a base station; and
performing or stopping transmission of a reference signal based on the information related to the reference signal reception state.
2. The method of claim 1, wherein the information on the reference signal reception state comprises at least one of:
identification information of the reference signal;
information indicating that the reference signal disappears;
stopping transmitting the indication information of the reference signal;
stopping transmitting the information of the cell or the frequency in which the reference signal is positioned;
indication information received by the reference signal;
continuing to transmit the indication information of the reference signal;
and continuously transmitting the information of the cell or the frequency in which the reference signal is positioned.
3. The method of claim 1 or 2, further comprising:
sending information related to the reference signal transmission notification to a central unit device of the base station,
wherein the information related to reference signal transmission notification comprises at least one of:
cell information of remote interference is detected;
interference measurement results of each interfered cell;
the distribution unit equipment starts to transmit reference signal notification information;
starting cell information for transmitting reference signals;
configuration information of a reference signal;
the set of interfered base stations identifies the ID.
4. A method for a hub unit device of a base station, the method comprising:
receiving information related to a reference signal reception status from a central unit device of an interfering base station through a backhaul network; and
transmitting information about the reference signal reception state to the distribution unit apparatus of the base station to cause the distribution unit apparatus of the base station to perform or stop transmission of the reference signal based on the information about the reference signal reception state.
5. The method of claim 4, wherein the information related to the reference signal reception status comprises at least one of:
identification information of the reference signal;
information indicating that the reference signal disappears;
stopping transmitting the indication information of the reference signal;
stopping transmitting the information of the cell or the frequency in which the reference signal is positioned;
indication information received by the reference signal;
continuing to transmit the indication information of the reference signal;
and continuously transmitting the information of the cell or the frequency in which the reference signal is positioned.
6. The method of claim 4 or 5, further comprising:
receiving information related to a reference signal transmission notification from a distribution unit device of a base station,
wherein the information related to reference signal transmission notification comprises at least one of:
cell information of remote interference is detected;
interference measurement results of each interfered cell;
the distribution unit equipment starts to transmit reference signal notification information;
starting cell information for transmitting reference signals;
configuration information of a reference signal;
the set of interfered base stations identifies the ID.
7. A method for a distributed unit device of a base station, the method comprising:
transmitting information related to a reference signal reception state received by a central unit device of a base station; and
performing or stopping performing an interference coordination scheme based on the information related to the reference signal reception status.
8. The method of claim 7, wherein the information on the reference signal reception state comprises at least one of:
identification information of the reference signal;
indication information received by the reference signal;
cell or frequency information received by the reference signal;
information indicating that the reference signal disappears;
cell or frequency information where the reference signal disappears;
an interfered base station set identification ID;
an interfering base station set identification ID;
one or more tracking area identification ID/base station global identification ID information.
9. The method of claim 7 or 8, further comprising:
transmitting information related to the interference coordination scheme execution notification to a central unit apparatus of the base station,
wherein the information related to interference coordination scheme execution notification comprises at least one of:
cell information received by a reference signal;
each cell measurement result of the received reference signal;
an interfered base station set identification ID;
indication information received by the reference signal;
the distribution unit equipment executes the notification information of the interference coordination scheme;
distributing interference coordination scheme information configured by unit equipment;
cell information for performing an interference coordination scheme;
an interfering base station set identification ID;
one or more tracking area identification ID/base station global identification ID information.
10. The method of claim 7 or 8, further comprising:
transmitting information related to the end interference coordination scheme notification to a central unit device of the base station,
wherein the information related to ending interference coordination scheme notification comprises at least one of:
the distribution unit equipment finishes the notification information of the interference coordination scheme;
identification information of an interference coordination scheme.
11. A method for a hub unit device of a base station, the method comprising:
receiving information related to a reference signal reception state from a distribution unit device of a base station to cause the distribution unit device of the base station to perform or stop performing an interference coordination scheme based on the information related to the reference signal reception state; and
and sending the information related to the reference signal receiving state to the centralized unit equipment of the interfered side base station through a return network.
12. The method of claim 11, wherein the information on the reference signal reception state comprises at least one of:
identification information of the reference signal;
indication information received by the reference signal;
cell or frequency information received by the reference signal;
information indicating that the reference signal disappears;
cell or frequency information where the reference signal disappears;
an interfered base station set identification ID;
an interfering base station set identification ID;
one or more tracking area identification ID/base station global identification ID information.
13. The method of claim 11 or 12, further comprising:
receiving information on an interference coordination scheme execution notification transmitted by a distribution unit apparatus of a base station,
wherein the information related to interference coordination scheme execution notification comprises at least one of:
cell information received by a reference signal;
each cell measurement result of the received reference signal;
an interfered base station set identification ID;
indication information received by the reference signal;
the distribution unit equipment executes the notification information of the interference coordination scheme;
distributing interference coordination scheme information configured by unit equipment;
cell information for performing an interference coordination scheme;
an interfering base station set identification ID;
one or more tracking area identification ID/base station global identification ID information.
14. The method of claim 11 or 12, further comprising:
receiving information on an end interference coordination scheme notification sent by a distribution unit device of a base station,
wherein the information related to ending interference coordination scheme notification comprises at least one of:
the distribution unit equipment finishes the notification information of the interference coordination scheme;
identification information of an interference coordination scheme.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410308390.2A CN118317359A (en) | 2019-03-28 | 2019-04-09 | Method and apparatus for remote interference coordination for CU-DU separated base station |
| US16/834,851 US11516816B2 (en) | 2019-03-28 | 2020-03-30 | Method and device for remote interference management in wireless communication system |
| EP20778724.3A EP3942718A4 (en) | 2019-03-28 | 2020-03-30 | Method and device for remote interference management in wireless communication system |
| PCT/KR2020/004357 WO2020197360A1 (en) | 2019-03-28 | 2020-03-30 | Method and device for remote interference management in wireless communication system |
| US18/059,208 US20230087340A1 (en) | 2019-03-28 | 2022-11-28 | Method and device for remote interference management in wireless communication system |
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