CN111757384B - Method and apparatus for remote interference coordination for CU-DU separated base station - Google Patents
Method and apparatus for remote interference coordination for CU-DU separated base station Download PDFInfo
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- CN111757384B CN111757384B CN201910281376.7A CN201910281376A CN111757384B CN 111757384 B CN111757384 B CN 111757384B CN 201910281376 A CN201910281376 A CN 201910281376A CN 111757384 B CN111757384 B CN 111757384B
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Abstract
The invention provides a method and equipment for remote interference coordination of a CU-DU separated base station. The method comprises the following steps: the interfered base station distribution unit device receives information related to a reference signal reception state transmitted by the concentration unit device of the interfered base station, and performs or stops transmission of a reference signal based on the information related to the reference signal reception state; the distribution unit device of the interfering base station transmits information about the reference signal reception state to the concentration unit device of the interfering base station, and performs or stops performing an interference coordination scheme based on the information about the reference signal reception state.
Description
Technical Field
The present invention relates to wireless communication technology, and in particular, to a method and apparatus for interacting information such as remote interference detection and interference coordination between a centralized 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 interference base station (aggresor gNB) to a local interfered base station (Victim gNB), reliability of uplink data reception of the local interfered base station is guaranteed, a RIM (Remote Interference Management ) research project is introduced by a 3GPP RAN in 5G Phase II-R16. As shown in fig. 1, the downlink subframe signal transmitted by the remote interfering base station is affected by refraction of atmospheric waveguide, when reaching the local interfered base station, the transmission delay falls into the uplink subframe period configured by the local base station, so that interference is generated to the receiving and demodulating of the uplink subframe information of the local interfered base station. Although a single remote interfering base station has less influence on a local interfered base station, if the interference generated by a large number of remote interfering base stations is superimposed, the SNR around the local interfered base station is close to or lower than the minimum signal-to-noise ratio SNR required when the local interfered base station receives the uplink data, which cannot be normally received by the UE, in the uplink subframe period, or the receiving performance is reduced, and the error rate is increased. Thus, RIM mechanisms are introduced to avoid or reduce remote interference.
As shown in fig. 2, 3gpp RAN WG1 defines RIM framework 2.1, the workflow is as follows:
step 0: atmospheric waveguide phenomena occur and remote disturbances occur.
Step 1: the local base station detecting that the surrounding thermal noise interference (IoT: interference over thermal) rises above the threshold upon uplink reception means that the local base station is interfered by a remote interfering base station, referred to as the interfered base station, which may be a gNB, eNB or other base station type, and taking the interfered base station as a gNB as an example, the method described below is also applicable to other types of base stations. The interfered base station (i.e., the Victim gNB) reports to the OAM system (Operation And Management). The OAM divides the interfered base stations into a group (group) and configures the same remote interference management Reference Signal (RIM-RS: remote Interference Management-Reference Signal) and requires the local interfered base stations to transmit. Meanwhile, a remote interference base station (namely Aggresor gNB) starts RIM-RS monitoring under OAM configuration.
Step 2: when the remote interfering base station receives the RIM-RS, the local interfered base station is informed that the RIM-RS has been received and the local interfered base station keeps transmitting the RIM-RS through a backhaul (backhaul) network, and an interference coordination scheme is applied after the remote interfering base station interacts with the OAM, for example, a downlink symbol that generates remote interference to the local interfered base station is closed based on a time domain scheme (mute).
Step 3: when the remote interfering base station cannot receive the RIM-RS, the local interfered base station is informed of the disappearance of the RIM-RS through the backhaul network, and the application of the interference coordination scheme is released to restore to the previous state.
Step 4: and after receiving the indication of the disappearance of the RIM-RS, 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 the virtualization of the network function, a base station structure of CU (central unit) -DU (distributed unit) separation is defined. I.e. a base station may be further divided into a centralized unit and a distributed unit (abbreviated CU and DU in the present invention). The CU has a Radio Resource Control (RRC) layer, a service data adaptive protocol (SDAP: service Data Adaptation Protocol) layer, a Packet Data Convergence Protocol (PDCP) protocol layer, and the like. The DU has a radio link control protocol (RLC) layer, a Medium Access Control (MAC) layer, 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 CUs and DUs. Thus, in the case of CU-DU separation, more information needs to be interacted between CU-DUs in view of the implementation of the RIM mechanism.
In the prior art, according to the current protocol (TR 38.866-g 00), the implementation of the RIM mechanism has not considered a base station architecture for CU-DU separation. For example, the detection of remote interference is implemented on the DU side of the local base station, and the CU has not acquired relevant information (e.g., which cell under which DU detects remote interference), where only the DU detects the relevant information first. For example, the RIM-RS received by the remote base station is monitored on its DU side, requiring the CU to know after the DU is reported to the CU. In summary, to ensure proper implementation of the remote interference coordination mechanism, both at the locally interfered base station and at the remote interfering base station, the necessary information about the RIM needs to be interacted between the CU and the DU.
The problem to be solved by the present invention may include the interaction of related information between the interfered base station side CU and DU to ensure the correct implementation of the RIM mechanism.
The problem to be solved by the present invention may also include interfering with the mutual correlation information between the base station side CU and the DUs to ensure the correct implementation of the RIM mechanism.
Solution scheme
According to one aspect of the present invention, there is provided a method for a distributed unit apparatus of a base station, the method comprising: receiving information related to 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 related to the reference signal reception state.
The method according to the present invention, wherein the information about the reference signal reception state includes at least one of the following information: identification information of the reference signal; indication information of disappearance of the reference signal; stopping transmitting the indication information of the reference signal; stopping transmitting information of a cell or frequency where the reference signal is located; indication information received by the reference signal; continuing transmitting the indication information of the reference signal; and continuing to transmit information of the cell or frequency where the reference signal is located.
The method according to the invention further comprises: receiving information related to a remote interference measurement configuration transmitted by a central unit device of a base station; remote interference measurements are performed based on 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 central 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 comprises 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 of a transmitted reference signal is started.
The method according to the invention further comprises: transmitting information related to interference measurement reports to a central unit device of a base station, wherein the information related to interference measurement reports comprises at least one of: detecting cell information of remote interference; each interfered cell interferes with the measurement.
The method according to the invention further comprises: transmitting information related to a reference signal transmission notification to a hub unit device of a base station, wherein the information related to the reference signal transmission notification includes at least one of: detecting cell information of remote interference; each interfered cell interference measurement; the distribution unit equipment starts to transmit the reference signal notification information; starting cell information of a transmitted reference signal; configuration information of reference signals; an interfered base station set identification ID; response information of the transmitted reference signal is initiated.
The method according to the invention further comprises: transmitting information about a response to the transmission stop reference signal to a hub unit device of the base station, wherein the information about the response to the transmission stop reference signal includes at least one of: the distribution unit equipment stops transmitting the reference signal notification information; identification information of the reference signal; and stopping transmitting response information of the reference signal.
According to another aspect of the present invention, there is provided a method for a central unit device of a base station, the method comprising: receiving information related to a reference signal reception state from a central unit device of an interfering base station through a backhaul network; and transmitting information related to the reference signal reception state to the distribution unit equipment of the base station, so that the distribution unit equipment of the base station performs or stops transmission of the reference signal based on the information related to the reference signal reception state.
The method according to the present invention, wherein the information related to the reception state of the reference signal includes at least one of the following information: identification information of the reference signal; indication information of disappearance of the reference signal; stopping transmitting the indication information of the reference signal; stopping transmitting information of a cell or frequency where the reference signal is located; indication information received by the reference signal; continuing transmitting the indication information of the reference signal; and continuing to transmit information of the cell or frequency where the reference signal is located.
The method according to the invention further comprises: information related to the remote interference measurement configuration is transmitted to the distribution unit equipment of the base station such that the distribution unit equipment of the base station performs remote interference measurement based on the information related to the remote interference measurement configuration.
The method according to the invention further comprises: information related to the reference signal transmission indication is sent to the distribution unit equipment of the base station to cause the distribution unit equipment 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 comprises 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 of a transmitted reference signal is started.
The method according to the invention further comprises: receiving information related to interference measurement reports from a distribution unit device of a base station, wherein the information related to interference measurement reports comprises at least one of: detecting cell information of remote interference; each interfered cell interferes with the measurement.
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: detecting cell information of remote interference; each interfered cell interference measurement; the distribution unit equipment starts to transmit the reference signal notification information; starting cell information of a transmitted reference signal; configuration information of reference signals; an interfered base station set identification ID; response information of the transmitted reference signal is initiated.
The method according to the invention further comprises: receiving information about a response to the transmission stop reference signal from a distribution unit device of the base station, wherein the information about the response to the transmission stop reference signal includes at least one of: the distribution unit equipment stops transmitting the reference signal notification information; identification information of the reference signal; and stopping transmitting 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 to 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 about the reference signal reception state includes at least one of the following information: identification information of the reference signal; indication information received by the reference signal; the information of the cell or the frequency received by the reference signal; indication information of disappearance of the reference signal; and the reference signal disappears in the cell or frequency information.
The method according to the invention further comprises: receiving information related to a reference signal measurement configuration transmitted by a central unit device of a base station; the reference signal measurement is performed based on information related to the reference signal measurement configuration.
The method according to the invention further comprises: receiving information about an interference coordination scheme execution instruction 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 the following information: a reference signal measurement method; reporting threshold or reporting condition; a threshold to perform an interference coordination scheme; configuration information of an interference coordination scheme; 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; executing indication information of an interference coordination scheme; configuration information of an interference coordination scheme; cell information of the interference coordination scheme is performed.
The method according to the invention further comprises: transmitting information related to a reference signal measurement report to a hub unit device of a base station, wherein the information related to the 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 the reference signal; each cell measurement of the reference signal is detected.
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 comprises at least one of the following: cell information received by the 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 of an interference coordination scheme is executed; 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 the following: ending the interference coordination scheme indication information; identification information of an interference coordination scheme; and ending the cell information of the interference coordination scheme.
The method according to the invention further comprises: transmitting information related to an end interference coordination scheme notification to a central unit device of a base station, wherein the information related to the end interference coordination scheme notification comprises at least one of the following: the distribution unit equipment ends 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 for a central 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, such 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 central unit equipment of the interfered side base station through a backhaul network.
The method according to the present invention, wherein the information about the reference signal reception state includes at least one of the following information: identification information of the reference signal; indication information received by the reference signal; the information of the cell or the frequency received by the reference signal; indication information of disappearance of the reference signal; and the reference signal disappears in the cell or frequency information.
The method according to the invention further comprises: information related to the reference signal measurement configuration is transmitted to the distribution unit equipment of the base station so that the distribution unit equipment of the base station performs reference signal measurement based on the information related to the reference signal measurement configuration.
The method according to the invention further comprises: information related to an interference coordination scheme execution indication is transmitted to a distribution unit device of the base station so that the distribution unit device of the base station starts 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 the following information: a reference signal measurement method; reporting threshold or reporting condition; a threshold to perform an interference coordination scheme; configuration information of an interference coordination scheme; 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; executing indication information of an interference coordination scheme; configuration information of an interference coordination scheme; cell information of the 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 the 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 the reference signal; each cell measurement of the reference signal is detected.
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 the 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 of an interference coordination scheme is executed; 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 sent 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 the following: ending the interference coordination scheme indication information; identification information of an interference coordination scheme; and ending the cell information of the interference coordination scheme.
The method according to the invention further comprises: receiving information related to ending an interference coordination scheme notification transmitted by a distribution unit device of a base station, wherein the information related to ending the interference coordination scheme notification comprises at least one of the following: the distribution unit equipment ends 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 device of a base station, the distribution unit device including: a transceiver configured to receive and transmit information; a controller configured to control the apparatus to perform reception of information related to 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 related to the reference signal reception state.
According to another aspect of the present invention, there is provided a central unit apparatus of a base station, the central unit apparatus comprising: a transceiver configured to receive and transmit information; a controller configured to receive information related to a reference signal reception state from a central unit device of an interfering base station through a backhaul network; and controlling the apparatus to transmit information related to the reference signal reception state to the distribution unit apparatus of the base station so that the distribution unit apparatus of the base station performs or stops transmission of the reference signal based on the information related to the reference signal reception state.
According to another aspect of the present invention, there is provided a distribution unit device of a base station, the distribution unit device including: 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 to 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 central unit apparatus of a base station, the central unit apparatus comprising: a transceiver configured to receive and transmit information; a controller configured to control the apparatus to receive information related to a reference signal reception state from 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 related to the reference signal reception state; and transmitting the information related to the reference signal receiving state to the central 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 gNB), comprising:
step 1: the DU initiates remote interference measurement.
The DU may measure according to measurement configuration information sent by the CU, where the configuration may be OAM configured to the CU, or may be self-generated by the CU. The measurement configuration information contains one or more of the following:
measurement methods (e.g. measuring the average of remote interference noise suffered by symbols in an uplink subframe over a period of time);
-reporting threshold or reporting condition, if the remote interference measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the remote interference measurement to the CU;
-a threshold for transmitting RIM-RS, the DU may initiate the transmission of RIM-RS if the measurement of the DU meets the threshold;
configuration information of RIM-RS (either OAM configured to the CU or self-generated by the CU pre-configured with a set Identification (ID)).
Or the DU can start the measurement of the remote interference by itself according to the characteristics of the remote interference, or the DU starts the measurement of the remote interference under the configuration of the OAM.
Step 2: the DU sends a message to the CU reporting the remote interference detection result or the RIM-RS configuration.
After the DU performs measurement, according to the measurement configuration sent by the CU or the OAM, if the measurement configuration comprises a reporting threshold or a transmitting RIM-RS threshold, the DU reports the measurement result to the CU. The message carries one or more of the following information:
the DU initiates transmission of RIM-RS notification information (if the DU can autonomously decide to transmit RIM-RS from OAM or autonomously configure RIM-RS);
-initiating transmitting cell information of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores transmitting cell information of RIM-RS);
configuration information of RIM-RS (configuration of RIM-RS may be OAM configured to DU, or may be DU preconfigured with set ID self-generated);
cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (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 the interfered symbols, etc.) of each interfered cell (if a CU obtains or autonomously configures RIM-RS from an OAM and sends it to a DU, the DU must report this information, and the CU or OAM configures an appropriate RIM-RS according to this information);
the interfered base station set ID (either OAM configured to the DU or DU preconfigured with set ID).
Step 3: the DU receives the message sent by the CU, configures RIM-RS, starts transmitting RIM-RS and other instructions. The message contains one or more of the following information:
-initiating transmission of an indication of RIM-RS;
-continuing to transmit the indication information of the RIM-RS;
-a RIM-RS reception (reception of RIM-RS) indication;
-a RIM-RS vanishing (disappearance of RIM-RS) indication;
-ceasing to transmit the indication information of the RIM-RS;
RIM-RS configuration information (either OAM configured to the CU or self-generated by the CU pre-configured set ID);
the interfered base station set ID (may be OAM configured to the CU or CU preconfigured with set ID);
-initiating transmission of cell information of the RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows in step 1 the cell information of the remote interference detected, the CU may directly indicate the cell information of the transmitting RIM-RS);
-cell information to continue transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to initiate transmitting RIM-RS, the CU may directly indicate to continue transmitting RIM-RS);
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start transmitting RIM-RS, the CU may directly indicate to stop transmitting RIM-RS cell information).
Step 4: DU transmits or stops transmitting RIM-RS. A message may be sent to the CU indicating that the DU has started transmitting or stopped transmitting RIM-RSs. The message contains one of the following information:
initiating a response message to transmit the RIM-RS (if the CU indicates that the DU transmits the RIM-RS, this message informs the CU when the DU performs success or failure);
-a response message to stop transmitting RIM-RS (if the CU instructs the DU to stop transmitting RIM-RS, this message informs the CU when the DU execution is successful);
the DU stops transmitting RIM-RS notification information (the DU autonomously decides to stop transmitting RIM-RS, after the DU execution is successful, this information notifies the CU).
The DU can send the RIM-RS on the cell specified by the Uu interface (can be the DU decision or the CU specification, and can be the cell where the remote interference is detected or the cell where the remote interference is not detected) according to the configuration information of the RIM-RS and the indication information for starting the RIM-RS obtained in the step 3. The DU may then send a response message to the CU initiating the transmission of the RIM-RS.
Or the DU obtains or utilizes the configuration information of the interfered base station set ID and the RIM-RS which are preconfigured by the DU from the OAM through the step 2, when the detection result of the remote interference is larger than the threshold of 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 on the cell which detects the remote interference or the cell which does not detect the remote interference). The DU then sends a DU start transmit RIM-RS notification message to the CU using step 2.
Or the DU continues to transmit the RIM-RS on the cell designated by the Uu interface (which may be the cell in which the remote interference is detected or the cell in which the remote interference is not detected) through the indication information of continuing to transmit the RIM-RS obtained in the step 3.
Or the DU receives the indication information through the RIM-RS obtained in the step 3, and continues to transmit the RIM-RS on the cell designated by the Uu interface (which can be the cell determined by the DU or designated by the CU, or the cell in which the remote interference is detected or the cell in which the remote interference is not detected).
Or stopping sending the RIM-RS on the cell designated by the Uu interface (which can be the determination of the DU or the designation of the CU) by the DU through the instruction information for stopping the RIM-RS obtained in the step 3. The DU may then send a response message to the CU to stop transmitting RIM-RS.
Or stopping transmitting the RIM-RS on the cell designated by the Uu interface (which can be the determination of the DU or the designation of the CU) by the DU through the RIM-RS disappearance instruction information obtained in the 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 (aggresor gNB) to cancel remote interference, including:
step 1: DU initiates RIM-RS detection.
The DU may initiate RIM-RS detection based on the measurement configuration message received from the CU. The information related to RIM-RS measurement configuration may be OAM configured to the CU, or may be sent to the CU of the interfering base station by backhaul signaling by using the previously preset interfering base station set ID and the interfered base station set ID after the interfered base station detects remote interference. The configuration information contains one or more of the following:
-measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting threshold or reporting condition, if RIM-RS measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the RIM-RS measurement to the CU;
-a threshold for performing an interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if RIM-RS measurements of the DU meet the threshold;
Configuration information of the interference coordination scheme, such as one or more interference coordination schemes (not excluding interference coordination schemes newly incorporated into the specification as the study goes in depth) (CU interactively acquired with OAM or CU preconfigured);
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Interfering base station set ID (obtained by CU interworking with OAM, or pre-configured by CU).
Or DU itself directly starts RIM-RS detection itself according to OAM configuration.
After the DU detects the RIM-RS, if the DU can decide to configure the interference coordination mechanism itself or the DU can get the interference coordination mechanism from the OAM, the DU performs the interference coordination mechanism, and the DU sends a message of step 2 to the CU indicating that the RIM-RS has received and informing the CU that the interference coordination mechanism has started to be performed.
If the DU is not configured with an interference coordination mechanism after the DU detects the RIM-RS, the DU may send a message indicating to the CU that the RIM-RS has received and requested the interference coordination mechanism.
Step 2, the DU sends a message to the CU, and informs information about the detection state of the RIM-RS, configuration application about the interference coordination scheme and the like. The message carries one or more of the following information:
A RIM-RS reception (reception of RIM-RS) indication (optional information, since when there is only a base station set ID or an interfered base station set ID, also implicitly indicates that RIM-RS is detected);
-RIM-RS disappeared (disappearance of RIM-RS) indication (optional information, if RIM-RS is detected with implicit indication when there is only base station set ID or interfered base station set ID, then also the disappeared RIM-RS can be implicitly indicated with no base station set ID or interfered base station set ID);
-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 used, then the implicit indication of the disappearance of RIM-RS can also be used when no base station set ID or interfered base station set ID is present);
-the DU performs interference coordination scheme notification information;
interference coordination scheme information for DU configuration, as one or more of the following (interference coordination schemes that do not exclude new inclusion specifications with the penetration of research):
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Cell information for performing the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information for performing the interference coordination scheme);
-interference coordination scheme request (optional information, when carrying measurement result information of RIM-RS on DU side, may also implicitly represent request for interference coordination scheme, CU selects appropriate interference coordination scheme according to measurement result or CU interacts with OAM to obtain interference coordination scheme) (if DU configures interference coordination scheme, no request is needed);
-cell information of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
cell measurement results (optional information such as RIM-RS power value, delay, etc.) of each detected RIM-RS (if the DU is not configured with an interference coordination mechanism, this information must be reported when it needs to be acquired from the CU, which configures the appropriate interference coordination mechanism based on this information);
the interfering base station set identification ID (DU is obtained interactively with OAM or is pre-configured. If detection or disappearance information of RIM-RS is transmitted to the interfered base station using the alternative backhaul Solution 1 mentioned in the specification TR38.866 and is not previously notified to the CU by other means like the F1 Setup procedure or if information is updated, the CU has to be notified of this information even if it is previously notified);
One or more tracking area identities ID/base station global identities ID information (DU and OAM interaction query gets one or more tracking area identities ID/base station global identities ID information mapped by the interfered base station set ID), which information has to be informed to the CU if the detection or disappearance information of the RIM-RS is transmitted to the interfered base station over the backhaul network using the alternative Solution 2 mentioned in the specification TR 38.866.
And if the interference base station CU obtains the RIM-RS receiving indication and the disappearing indication, notifying the RIM-RS receiving indication or the disappearing indication to the base stations in the interference base station set by using a back transmission signaling transmission mechanism.
In step 3, the DU receives a message sent by the CU, wherein the message carries configuration information about an interference coordination mechanism (the interference coordination mechanism can be configured to the CU by OAM or can be determined 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 the interference coordination scheme, such as the one or more interference coordination schemes do not exclude interference coordination schemes newly incorporated into the specification as the study proceeds) (CU interactively acquired with OAM or pre-configured by CU);
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
-performing interference coordination scheme indication information;
end interference coordination scheme indication information (after the CU receives RIM-RS vanishing information reported by the DU, if the CU controls the stop of the interference coordination scheme, the CU indicates the DU to end the execution of the interference coordination scheme by sending this information);
cell information for performing the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, possibly indicating directly the cell information for performing the interference coordination scheme if the CU already knows in step 2 that the cell information of the RIM-RS is received);
cell information ending the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start performing the interference coordination scheme, it may directly indicate the cell information ending the interference coordination scheme).
Step 4. DU starts to execute and ends the interference coordination scheme. A message may be sent to the CU indicating that the DU has initiated execution or ended the interference coordination scheme. The message contains one of the following information:
Response information to perform the interference coordination scheme (indication by the CU that the DU initiates the interference coordination scheme execution, the response information informing the CU 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 interference coordination scheme execution, the response information informing the CU after the DU ends execution success);
end of DU interference coordination scheme notification information (DU autonomously decides to end the interference coordination scheme execution, and after the end of the DU execution is successful, the information notifies the CU).
The DU may obtain an interference coordination (interference) mechanism from the OAM after the DU detects the RIM-RS according to step 2, and if the measurement result is greater than the threshold for performing the interference coordination scheme, the DU performs the interference coordination scheme on a designated cell (a cell where the RIM-RS is detected or a cell where the RIM-RS is not detected). The DU then sends the DU to perform interference coordination scheme notification information to the CU, which may also carry the DU configured interference coordination scheme information to the CU. If the measurement result does not meet the threshold of 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 the step 2, and then the CU sends a message to the DU through the step 3 to instruct the DU to start executing the interference coordination scheme. The DU performs an interference coordination scheme on a designated cell (either a cell where the RIM-RS is detected or a cell where the RIM-RS is not detected, or possibly directly designated by the CU). The DU may then send response information to the CU to perform the interference coordination scheme.
The DU may obtain the interference coordination mechanism from the CU according to step 3 after the DU detects the RIM-RS, and 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 CU to perform the interference coordination scheme.
The DU may finish performing the interference coordination scheme on the designated cell (on the cell where the RIM-RS is detected or the cell where the RIM-RS is not detected) according to step 2 after the DU detects the RIM-RS to disappear, and send the RIM-RS disappearance indication and the DU termination interference coordination scheme notification information to the CU through step 2. Or after informing the CU of the RIM-RS disappearing indication in the step 2, the CU issues an indication to the DU to end the interference coordination scheme in the step 3, and then the DU can send response information for ending the interference coordination scheme to the CU.
Technical effects
According to embodiments of the present invention, for a base station where CU-DU is separate, CU and DU may interact with the necessary or optional information about RIM mechanism implementation to ensure proper or more optimal implementation of the RIM mechanism.
Drawings
FIG. 1 is a schematic diagram of remote interference generation;
FIG. 2 is a workflow 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 workflow diagram of an improved RIM framework 2.1 under CU-DU separation according to an embodiment of the present application;
fig. 7 is a flowchart of overall RIM signaling for acquiring RIM-RS configuration information through CU and OAM interactions according to an embodiment of the present application;
fig. 8 is a flowchart of overall RIM signaling for acquiring RIM-RS configuration information through DU and OAM interactions 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 present 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 interfering base stations according to an embodiment of the present application.
Detailed Description
The message names in the present invention are examples only, and other names may be employed. The information to be transmitted between the CU and the DU may define a new message separately, or may use a new IE added to an existing message in the existing F1 interface specification 3gpp ts38.473 (e.g., adding a new IE to a gNB-DU Configuration Update or gNB-CU Configuration Update message).
The description in the following embodiments refers to the specific names and explanations as follows:
oam (Operation And Management): the operation maintenance management entity and system are particularly responsible for configuration and measurement configuration of RIM-RS, configuration of set Identification (ID), configuration of certain interference coordination schemes and the like.
AMF (Access and Mobility Management Function) is a network element of the 5G core network, which is responsible for 5G base station access and mobility management, and the 5G base station is connected with the AMF through an NG-C interface.
3. Identification information of reference signals: refers to the interfered base station set Identification (ID) information, i.e., the interfered base station set IDs, or the base station set Identification (ID) information, or the set ID information, each set ID corresponds to one RIM-RS. Of course, identification information representing the reference signal in other ways, such as a reference signal ID or index, etc., is not excluded.
4. Reference signal: reference signals referred to herein refer specifically to RIM-RS remote interference managed reference signals in which set ID information is encoded and transmitted with a specified sequence, time-frequency resources.
5. Identification information of the interference coordination scheme: the interference coordination scheme adopted by the finger receiving a certain reference signal can be identified by the corresponding relation between the set ID of the interfered base station and the interference coordination scheme, or by the set ID of the base station or by the set ID, and each set ID corresponds to one interference coordination scheme. Of course, identification information that otherwise represents the interference coordination scheme, such as an ID or Index (Index) of the interference coordination scheme, etc., is not excluded.
6. Tracking area identity ID/base station global identity ID: i.e., TAI (Tracking Area Identity)/globalgNB ID.
Fig. 4 depicts a first embodiment of the present invention. This embodiment describes a procedure for remote interference detection by an interfered base station. The interfered base station (Victim gNB) is separated into a base station centralized control unit CU and a base station distribution unit DU, one CU being connectable 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 used in other systems, the corresponding interface and message name will change accordingly. It should be noted that the following steps are not all that is required, and in different cases, for example, whether the configuration of the OAM is on the DU or the CU, all or part of the steps may be performed.
Step 400, the interfered base station CU sends a remote interference measurement configuration message to the DU, and configures the DU to perform 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, and the message carries measurement configuration information and contains one or more of the following information:
Measurement methods (e.g. measuring the average of remote interference noise suffered by symbols in an uplink subframe over a period of time);
-reporting threshold or reporting condition, if the remote interference measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the remote interference measurement to the CU;
-a threshold for transmitting RIM-RS, the DU may initiate the transmission of RIM-RS if the measurement of the DU meets the threshold;
configuration information of RIM-RS (either OAM configured to the CU or CU preconfigured set ID self-generated).
Or for the detection of remote interference, the DU can be resolved by the interference characteristics (one cell or multiple cells on the DU monitor that the symbol (symbol) in the uplink subframe is suffering from thermal noise interference (IoT: interference over thermal) on the air interface and presents a state of gradually decreasing with the time domain of the symbol, the noise power is gradually reduced from high to low, which indicates that the noise is caused by remote interference), so the DU can start the measurement configuration by itself, and the CU is not required to send a message to trigger the DU to perform the measurement of remote interference, or the DU can start the remote interference detection by the OAM acquisition measurement configuration, that is, the 400 steps are not required to be executed.
The DU may be preconfigured with a remote interference reporting threshold or obtained from the CU by step 400. If the DU detects remote interference exceeding a set reporting threshold (which may be the absolute value of remote interference, e.g. how much dBm, or the relative value, e.g. minimum signal to noise ratio SNR required for uplink demodulation), the DU will report to the CU that remote interference was detected.
Step 401: the interfered base station DU sends a remote interference measurement report message to the base station CU reporting that remote interference is detected.
When the DU detects the remote interference, the DU sends a message 401 to the CU reporting the remote interference, the message 401 carrying one or more of the following information:
cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information where remote interference is detected);
interference measurements (e.g. interference noise power value, number of interfered symbols, signal-to-noise ratio at demodulation of the interfered symbols, etc.) per interfered cell.
Of course, the DU report remote interference situation may not include the above specific information, and only the fact that the DU has detected remote interference is reported to the CU. If the remote interference result detected by the DU does not meet the threshold of 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 for configuring 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 receiving 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 initiate the transmission of RIM-RS.
The CU receives the detection report sent by the DU, decides to start the RIM-RS transmission, sends a message to the DU, and informs the DU to start the RIM-RS transmission. 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 required for transmitting the RIM-RS, or may also contain the 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 (either OAM configured to the CU or CU preconfigured with set ID to generate itself; if there is an update in the information, the DU must be notified);
RIM-RS configuration information (either OAM configured to the CU or CU preconfigured with set ID self-generated. If configuration information is updated, the DU must be notified);
-initiating transmission of an indication of RIM-RS;
initiating transmitting cell information of the RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information of the detected remote interference in step 401, the CU may directly indicate the cell information of the transmitting RIM-RS).
After receiving the instruction of the CU, the DU transmits the RIM-RS on the cell designated by the CU by using the configured time-frequency resource. Or if the CU does not specify the cell information for transmitting the RIM-RS, the DU decides to transmit the RIM-RS by using the configured time-frequency resource 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 informing that the DU has initiated the transmission of RIM-RS to the CU.
If the DU can decide itself to start RIM-RS transmission, i.e. the CU configures the RIM-RS configuration information and the RIM-RS transmission threshold in step 400, or the OAM configures the RIM-RS transmission threshold and the RIM-RS configuration information for the DU, the remote interference result of the DU detection satisfies the RIM-RS transmission threshold, the DU decides to start transmitting RIM-RS, steps 401 and 402 may not be performed. The execution of step 403 proceeds directly from step 400. Or if the threshold of RIM-RS transmission is not configured, after the DU detects the remote interference, the DU can directly and autonomously decide or interact with the OAM to acquire information such as the configuration of the RIM-RS, and the like, and the transmission of the RIM-RS can be directly started. The DU may inform the CU with the message of step 403, the configuration information of the RIM-RS decided by the DU (or OAM configured to the DU). The message of step 403 carries one or more of the following information:
Cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information where remote interference is detected);
interference measurements per interfered cell (optional information such as interference noise power value, number of interfered symbols, signal to noise ratio at demodulation of interfered symbols, etc.);
-DU initiation transmitting RIM-RS notification information;
-initiating transmitting cell information of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores transmitting cell information of RIM-RS);
configuration information of RIM-RS (configuration of RIM-RS may be OAM configured to DU, or DU preconfigured with set ID self-generated;
the interfered base station set ID (either OAM configured to the DU or DU preconfigured set ID., if the information is updated, must inform the CU).
When a DU finds remote interference, in order to increase the signal energy of transmitting RIM-RS, it may be necessary for a DU in the vicinity of the DU to also transmit the same RIM-RS signal, and the DU informs the CU that the DU decides (or OAM configures) RIM-RS configuration information for the DU, and the CU needs to forward the RIM-RS configuration information to other DUs. Or when a DU finds remote interference, in order to increase the signal energy of transmitting RIM-RS, it may be required that a DU in the vicinity of the DU also transmits the same RIM-RS signal, the DU informs the CU that the DU finds remote interference, the CU decides the configuration information of the RIM-RS (or OAM configuration to the CU), and transmits the RIM-RS configuration information to all corresponding DUs.
If the configuration information of the RIM-RS is configured to the DU by the CU in step 402, or/and the DU initiates the transmission of the RIM-RS based on the message of step 402, this message may be a response message of step 402. The message of step 403 in this case contains the following information:
initiating a response message to transmit the RIM-RS (CU indicates that the DU transmits the RIM-RS, which message informs the CU when the DU execution succeeds or fails).
Since there are multiple DUs that detect the existence of remote interference in the same area, and some DUs may be deployed under different base stations, the DUs that detect the remote interference perform the above steps with the connected CUs, and then the DUs obtain the same interfered base station set ID, the same RIM-RS configuration information, and start RIM-RS transmission.
When the DU detects remote interference, there may be remote interference base stations in different areas, so that their interference characteristics may be different (for example, interference frequency bands are different), so that the DU or CU or OAM may allocate multiple different RIM-RS configuration information and different Set IDs to the DU by analyzing the interference measurement result, and then the DU transmits multiple RIM-RSs at the same time on the air interface.
The interference base station generates remote interference to the interfered base station through the atmospheric waveguide phenomenon, and the interference base station can also receive RIM-RS transmitted by the interfered base station through the atmospheric waveguide phenomenon due to channel reciprocity. When the interference 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 back transmission network. The reception indication information of the RIM-RS is first received by the interfered base station CU, and needs to be triggered to notify the DU in step 404.
Step 404: the CU of the interfered base station sends a continue to transmit reference signal indication message or a reference signal reception indication message to the DU, which indicates that the DU continues to transmit RIM-RS.
When the CU of the interfered base station receives the status information forwarded from the backhaul network and indicating the RIM-RS to receive, the CU can send a message to the DU, indicate the RIM-RS to receive status to the DU, and then the DU decides to continue transmitting the RIM-RS, or directly indicates the DU to continue transmitting the RIM-RS, so as 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 no RIM-RS erasure indication is received or the transmission of RIM-RS indication information is stopped. If there is a corresponding timer mechanism on the DU side, the RIM-RS receiving indication is not received or RIM-RS indication information is continuously transmitted before the timer is overtime, the DU stops transmitting the RIM-RS, and the RIM-RS indication information is optional. The message contains at least one of the following information:
-identification information of RIM-RS;
a RIM-RS reception (reception of RIM-RS) indication (if a DU transmits RIM-RS of a plurality of different set IDs simultaneously, it needs to be indicated which set ID corresponds to the RIM-RS received by the interfering base station, i.e. carrying the identification information of the RIM-RS);
Continue transmitting RIM-RS indication information (if a DU transmits RIM-RS of a plurality of different set IDs simultaneously, it needs to indicate which set ID corresponds to which RIM-RS continues transmitting, i.e. carries RIM-RS identification information);
cell information such as cell identification information (NR CGI, or PCI, or index) of continuing to transmit RIM-RS (optional information, if the CU already knows the cell information to initiate transmission of RIM-RS, the CU may directly indicate the cell information to continue to transmit RIM-RS).
After the DU gets the state information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, and the DU can decide on these cells to continue transmitting the RIM-RS.
If the atmospheric waveguide phenomenon disappears, the interfering base station will not receive the RIM-RS transmitted by the interfered base station. When the interference base station cannot detect the RIM-RS, the interference coordination scheme is finished to be executed, and then the disappearance indication information of the RIM-RS is transmitted back to the interfered base station through the back transmission network. The disappearance indication of RIM-RS is first received by the interfered base station CU, and the DU is informed by the trigger step 405.
Step 405: the CU of the interfered base station sends a reference signal stop indication message or a reference signal disappearance indication message to the DU, and indicates the DU to stop transmitting the RIM-RS.
When the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates the RIM-RS to disappear, the information indicating the disappearance of the atmospheric waveguide phenomenon needs to be sent to the DU, or the CU directly indicates the DU to stop sending the RIM-RS. The message contains at least one of the following information:
-identification information of RIM-RS;
-RIM-RS erasure (disappearance of RIM-RS) indication information (if a DU transmits RIM-RS of a plurality of different set IDs simultaneously, it is necessary to indicate which set ID corresponds to RIM-RS that is not received at the interfering base station, i.e. carries the identification information of RIM-RS);
-indication information to stop transmitting RIM-RS (if a DU transmits RIM-RS of a plurality of different set IDs simultaneously, it is necessary to indicate which set ID corresponds to RIM-RS to stop transmitting, i.e. carrying 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, if the CU already knows the cell information to start transmitting RIM-RS, the CU may directly indicate to stop transmitting RIM-RS cell information).
After the DU gets the state 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 transmits a response message to the CU indicating that the transmission of the reference signal is stopped, indicating that the DU has stopped transmitting the RIM-RS.
If the message of step 405 carries the RIM-RS erasure (disappearance of RIM-RS) indication information to the DU, after the DU stops transmitting the RIM-RS, a notification of the stop transmitting RIM-RS may be sent to the CU. The message in step 406 contains the following information:
The DU stops transmitting RIM-RS notification information (if the DU transmits RIM-RS of a plurality of 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);
-identity information of RIM-RS.
If the message of step 405 carries an indication to the DU to stop transmitting the RIM-RS, a response message may be sent to the CU to indicate a friendly end to stop transmitting the RIM-RS after the DU stops transmitting the RIM-RS. The message in step 406 contains the following information:
stopping transmitting response information of the RIM-RS (if the DU transmits RIM-RS of a plurality of different Set IDs simultaneously, it is necessary to indicate which Set ID corresponds to the RIM-RS that has stopped transmitting, i.e. carries identification information of the RIM-RS);
-identity information of RIM-RS.
Steps 401 to 406 in fig. 4 may be performed in the order shown in fig. 4, may be performed in other orders, may be performed separately, or may be performed in combination of any two or more steps.
In one embodiment, only 404 is performed, further this step may be performed when the interfered base station DU is connected to the OAM, or the interfered base station CU is connected to the OAM.
In one embodiment, only 405 is performed, further this step may be performed when the interfered base station DU is connected to the OAM, or the interfered base station CU is connected to the OAM.
In one embodiment, 405 and 406 are performed, further this step may be performed when the interfered base station DU is connected to the OAM, or the interfered base station CU is connected to the OAM.
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 to OAM.
In one embodiment, 401 and 402 are performed, further, this step may be performed when the interfered base station DU is connected to the OAM, or the interfered base station CU is connected to the OAM.
In one embodiment, 401, 402 and 403 are performed, further this step may be performed when the interfered base station DU is connected to OAM or the interfered base station CU is connected to OAM.
Fig. 5 depicts a second embodiment of the present invention. This embodiment describes the procedure for interference base station RIM-RS detection. An interfering base station (aggresorgnb) is separated into a base station centralized control unit CU and a base station distribution unit DU, one CU being connectable 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 used in other systems, the corresponding interface and message name will change accordingly. It should be noted that the following steps are not all that is required, and in different cases, for example, whether the configuration of the OAM is on the DU or the CU, all or part of the steps may be performed.
Step 500: the CU of the interfering base station sends a reference signal measurement configuration message to the DU indicating that the DU monitors the RIM-RS.
The DU may initiate RIM-RS detection based on the measurement configuration message received from the CU. The information related to RIM-RS measurement configuration may be OAM configured to CU, or may be transmitted to CU of the interfering base station by bachkaul signaling using the previously preset interfering base station set ID and the interfered base station set ID after the interfered base station detects remote interference. The configuration information contains one or more of the following:
-measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting threshold or reporting condition, if RIM-RS measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the RIM-RS measurement to the CU;
-a threshold for performing an interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if RIM-RS measurements of the DU meet the threshold;
configuration information of the interference coordination scheme, such as one or more interference coordination schemes (without excluding interference coordination schemes newly incorporated into the specification as the study proceeds) (which may be OAM configured to the CU or may be self-generated by the CU);
Time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Interfering base station set ID (obtained by CU interworking with OAM, or pre-configured by CU).
Or the DU directly acquires the measurement configuration of the RIM-RS and the interference base station set ID from the OAM, so that the monitoring of the RIM-RS is started, and the CU is not required to send a message to trigger the DU to detect the RIM-RS, namely 500 steps are not required to be executed.
When the interfered base station DU detects remote interference, the RIM-RS is configured, and after the RIM-RS is transmitted at the air interface, the base station (Aggressor gNB) which causes remote interference can also receive the RIM-RS at the air interface through the atmospheric waveguide phenomenon. When the DU of the interference base station detects the RIM-RS for the first time on the air interface, if the RIM-RS measurement result of the DU exceeds a reporting threshold (the threshold may be the absolute value of RIM-RS power, such as how many dBm), the DU reports that RIM-RS information is monitored to the CU, and then the CU and the OAM interact to obtain a configured interference coordination scheme and an allocated interference base station set ID, or the CU can also determine the interference coordination scheme and use the pre-configured interference base station set ID by itself and then send a message to indicate to the DU. Or the DU directly reports the monitored RIM-RS information to the OAM, and obtains the configured interference coordination scheme and the allocated interference base station set ID from the OAM. Or the DU may also configure the interference coordination scheme itself and utilize the pre-configured interfering base station set IDs. Or the DU gets the configuration information of the interference coordination scheme configured by the CU and the interfering base station set ID in step 500.
Step 501: the DU of the interfering base station sends a reference signal measurement report message to the CU reporting that the RIM-RS is detected.
When the DU of the interfering base station detects the RIM-RS for the first time on the air interface, if the RIM-RS measurement result of the DU exceeds the reporting threshold (the threshold may be the absolute value of RIM-RS power, e.g. how many dBm) but does not meet the threshold for performing the interference coordination scheme, the DU needs to be reported to the CU, and the message 501 contains one or more of the following information:
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
a RIM-RS reception (reception of RIM-RS) indication (optional information, since when only the interfered base station set ID is present, also implicitly indicates that RIM-RS is detected);
-interference coordination scheme request (optional information, when carrying measurement result information of the DU side RIM-RS, may also implicitly represent that an interference coordination scheme is requested, CU selects an appropriate interference coordination scheme according to the measurement result or CU gets the interference coordination scheme from OAM) (if the DU is configured with an interference coordination scheme, no further request is needed);
interference coordination scheme information configured by the DU, such as one or more of the following (optional information, the DU configures the interference coordination scheme by OAM or itself):
Time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
-cell information of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
cell measurement results (such as RIM-RS power value, delay, etc.) of each detected RIM-RS.
If the DU requests the interference coordination scheme from the CU, the CU and OAM of the interfering base station interact to obtain the implemented interference coordination scheme and the configured interfering base station set ID, or the CU may itself decide to implement the interference coordination scheme and utilize the pre-configured interfering base station set ID and then send it to the DU.
Step 502: the CU of the interfering base station sends an interference coordination scheme execution indication message to the DU, and the DU is instructed 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 (CU obtained interactively with OAM or pre-configured by CU. If there is an update of the information, the DU must be notified);
-performing an indication of an interference coordination scheme;
configuration information of the interference coordination scheme, such as one or more interference coordination schemes (without excluding interference coordination schemes newly incorporated into the specification as the study goes deep) (either OAM configured to the CU or self-generated by the CU, if the DU is not configured with an interference coordination scheme, the DU must be notified):
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Cell information for performing the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows that the cell information of the RIM-RS was received in step 501, it may directly indicate the cell information for performing the interference coordination scheme).
After receiving the message 502, the interfering base station DU starts to perform the interference coordination scheme on the cell indicated by the CU. If the CU does not have cell information indicating that the DU performs the interference coordination scheme, the DU may perform the interference coordination scheme on a cell where the RIM-RS is detected or a cell where the RIM-RS is not detected.
Step 503: the DU of the interfering base station transmits an interference coordination scheme execution notification message to the CU, notifying the CU that the DU has started executing the interference coordination scheme.
When the DU detects the RIM-RS, if the DU can autonomously start to perform the interference coordination scheme, the CU does not need to request the CU any more, that is, in step 500, the CU configures configuration information of the interference coordination scheme, and performs the threshold of the interference coordination scheme and the interfering base station set ID. Or the DU reports the monitored RIM-RS information to the OAM, obtains the configured interference coordination scheme and the allocated interference base station set ID from the OAM, or obtains one or more tracking area identification ID/base station global identification ID information mapped by the interfered base station set ID contained in the RIM-RS from the OAM inquiry. Or the DU may also configure the interference coordination scheme itself and utilize the pre-configured interfering base station set IDs. And the RIM-RS measurement of the DU detection meets the threshold for performing the interference coordination scheme (if this threshold exists), the DU will immediately begin to perform the interference coordination scheme, steps 501 and 502 may not be performed, and the step 500 may be directly followed by the step 503. The DU may inform the CU with the message of step 503, the 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 of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
Cell measurement results (optional information such as RIM-RS power value, delay, etc.) of each detected RIM-RS;
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only the interfered set ID was present);
a RIM-RS reception (reception of RIM-RS) indication (optional information, since when only the interfered base station set ID is present, also implicitly indicates that RIM-RS is detected);
-the DU performs interference coordination scheme notification information;
interference coordination scheme information for DU configuration, such as one or more of the following (without excluding interference coordination schemes that are newly incorporated into the specification as research proceeds) (the configuration of the interference coordination scheme may be OAM configured to the DU or may be DU self-configured:
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Cell information for performing the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information for performing the interference coordination scheme);
Interfering base station set ID (either OAM configured to DU or DU preconfigured set ID. if detection or disappearance information of RIM-RS is transmitted to interfered base station using the alternative backhaul Solution 1 mentioned in specification TR38.866 and not previously notified to CU by other means like F1 Setup procedure or if information is updated, it has to be notified to CU if it is previously notified)
One or more tracking area identities ID/base station global identities ID information (DU and OAM interaction query gets one or more tracking area identities ID/base station global identities ID information mapped by the interfered base station set ID), which information has to be informed to the CU if the detection or disappearance information of the RIM-RS is transmitted to the interfered base station over the backhaul network using the alternative Solution 2 mentioned in the specification TR 38.866.
When a DU detects a RIM-RS, in order to expand the execution range of the interference coordination scheme, it may be necessary that a DU near the DU also executes the same interference coordination scheme, and the DU informs the CU of the interference coordination scheme configuration information decided by the DU (or configured by the OAM to 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, in order to expand the execution range of the interference coordination scheme, it may be required that a DU near the DU also executes the same interference coordination scheme, and the DU informs the CU that the DU finds the RIM-RS, the CU decides configuration information of the interference coordination scheme, and transmits the configuration information of the interference coordination scheme to all corresponding DUs.
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, this message may be a response message of step 502. The message of step 503 in this case contains the following information:
response information to perform the interference coordination scheme (CU instructs the DU to perform the interference coordination scheme, which information informs the CU when the DU performs success or failure).
Since there are multiple DUs of RIM-RS detected in the same area, and some DUs may be deployed in CUs under different base stations, the detected DUs of RIM-RS and the connected CUs execute the above steps, and then the DUs obtain the same interference base station set 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 areas. Because the interference characteristics may be different (such as different numbers of interfered symbols), the interfered base stations in different areas can allocate different RIM-RS configuration information and different set IDs to DUs by analyzing the interference measurement results, and then the DUs of the interfered base stations in different areas transmit RIM-RSs with different configurations on air interfaces. In this way, the DU of the interference base station can detect RIM-RS information of different set IDs at the same time on the air interface. Then, by analyzing the measurement result of RIM-RS, the DU, CU or OAM can configure different interference coordination schemes for the DU for the interfered base stations with different Set IDs, and then the DU can perform multiple interference coordination schemes simultaneously.
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 backhaul signaling, the interference base station has received the RIM-RS, the atmospheric waveguide phenomenon still exists, and the interfered base station needs to continuously transmit the RIM-RS to monitor when the atmospheric waveguide phenomenon disappears.
Step 504: the DU of the interfering base station transmits a reference signal reception indication message to the CU reporting RIM-RS reception.
If the atmospheric waveguide phenomenon still exists, the DU of the interfered base station still can detect the RIM-RS, and then the status information received by the RIM-RS is indicated to the interfered base station by the CU through the feedback signaling after the status information is reported to the CU, and the interfered base station needs to continuously transmit the RIM-RS. Message 504 contains one or more of the following information:
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
the RIM-RS reception (reception of RIM-RS) indication information (optional information, since RIM-RS is also implicitly detected when only the interfered base station set ID is present).
Cell information of RIM-RS is detected, such as cell identification information (NR CGI, or PCI, or index) (or frequency information of RIM-RS is detected).
If the DU detects the RIM-RSs of a plurality of different set IDs at the same time, the reception status information of the RIM-RSs of the different set IDs can be simultaneously reported to the CU in a list manner.
Step 505: the DU of the interfering base station sends a reference signal disappearance indication message to the CU reporting the RIM-RS disappearance.
If the atmospheric waveguide phenomenon disappears, when all cells under the DU of the interfering base station 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.
Message 505 contains one or more of the following information:
-interfered base station set ID (optional information, if the manner of detecting RIM-RS is implicitly indicated when only the interfered base station set ID is utilized, then the implicit indication of the disappearance of RIM-RS may also be utilized when no interfered base station set ID is present);
the RIM-RS disappearance (disappearance of RIM-RS) indication information (optional information, if the manner of implicitly indicating that the RIM-RS was detected when only the interfered base station set ID was utilized, can also be utilized when the interfered base station set ID was not utilized).
Cell information with the RIM-RS disappeared, such as cell identification information (NR CGI, or PCI, or index) (or cell frequency information with the RIM-RS disappeared).
If the DU initially detects the RIM-RS of different set IDs at the same time, the RIM-RS which is changed into part or all of set IDs can not be detected, and the disappearance state information of the RIM-RS of different set IDs can be reported to the CU at the same time in a list mode.
Since there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, and multiple cells under each DU. When all cells under the DU can not detect the state of the RIM-RS, the DU reports the state information of the RIM-RS disappearing to the CU, and similarly, when all the DU under the CU can not detect the state of the RIM-RS, the CU can indicate the state information of the RIM-RS disappearing to the interfered base station through a feedback signaling. The interfered base station then stops transmitting the RIM-RS.
Step 506: the CU of the interfering base station sends an end interference coordination scheme indication message to the DU, indicating the DU to end the interference coordination scheme.
When all cells under the interference 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, and then the CU indicates the DU to finish the interference coordination scheme. Message 506 contains one or more of the following information:
end interference coordination scheme indication information (if a DU detects RIM-RS of multiple different set IDs simultaneously, multiple interference coordination schemes are executed simultaneously, it needs to be indicated 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 ending the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start performing the interference coordination scheme, it may directly indicate the cell information ending the interference coordination scheme).
Another way that may be taken is that the DU knows which cells are performing the interference coordination scheme, and when all cells cannot receive the RIM-RS, it indicates that for the area covered by all cells under this DU, the atmospheric waveguide phenomenon does not exist, and the DU may decide to end the interference coordination scheme and then inform the CU.
Step 507: the DU of the interfering base station sends a response message to the CU ending the interference coordination scheme, indicating that the DU has ended the interference coordination scheme.
The CU is instructed via the message DU of step 506, ending the interference coordination scheme. 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 to end interference coordination scheme if the DU detects RIM-RS of multiple different set IDs simultaneously, executing multiple interference coordination schemes simultaneously, it needs to be indicated which set ID corresponds to the end of the coordination scheme, i.e. carries identification information of the interference coordination scheme);
-identification information of the interference coordination scheme.
When all cells under the interfering base station 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 then the DU can decide to end the interference coordination scheme without the CU executing step 506 to instruct the DU to end the interference coordination scheme, and then sends a message to the CU. The message of step 507 in this case contains the following information:
end interference coordination scheme notification information (if a DU detects RIM-RSs of multiple different set IDs simultaneously, multiple interference coordination schemes are executed simultaneously, it is necessary to indicate which set ID corresponds to the end of the coordination scheme, i.e. carry identification information of the interference coordination scheme);
-identification information of the interference coordination scheme.
If the CU, after having obtained a report that the DU detected the RIM-RS, also indicates that the interference coordination scheme was applied on DUs that did not detect the RIM-RS nearby, then for these DUs the stopping of the interference coordination scheme must be triggered by the CU by performing steps 506 and 507. Because these DUs cannot detect the RIM-RS, nor can it detect when the RIM-RS has disappeared, a CU is required to control the execution and stoppage of the interference coordination scheme.
And stopping monitoring the RIM-RS after the DU finishes executing the interference coordination scheme and resumes the initial configuration.
Steps 501 to 507 in fig. 5 may be performed in the order shown in fig. 5, may be performed in other orders, may be performed separately, or may be performed in combination of any two or more steps.
In one embodiment, only 504 is performed, further this step may be performed when interfering base station DU is connected to OAM or interfering base station CU is connected to OAM.
In one embodiment, only 505 is performed, further this step may be performed when interfering base station DU is connected to OAM or interfering base station CU is connected to OAM.
In one embodiment, only 507 ending the interference coordination scheme notification is performed, further this step may be performed when the interfering base station DU is connected to the OAM or the interfering base station CU is connected to the OAM.
In one embodiment, 506 and 507 are performed, further, this step may be performed when interfering base station DU and OAM, or interfering base station CU and OAM are connected.
In one embodiment, only 503 interference coordination scheme execution notification is executed, further this step may be executed when interfering base station DU is connected to OAM.
In one embodiment, 501 and 502 are performed, further this step may be performed when interfering base station DU is connected to OAM or interfering base station CU is connected to OAM.
In one embodiment, 501, 502 and 503 are performed, further this step may be performed when interfering base station DU and OAM, or interfering base station CU and OAM are connected.
Fig. 6 depicts a third embodiment of the present invention. The prototype is based on fig. 2, and after the conventional base station in the framework 2.1 proposed for the 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 a RIM-RS from OAM, the DU obtains configuration of an interference coordination scheme from OAM, and information such as detection of communication remote interference on an F1 interface, configuration of the RIM-RS, detection of the RIM-RS, configuration information of an interference coordination (interference) scheme is not required. The working flow is as follows:
step 0: atmospheric waveguide phenomena occur and remote disturbances occur.
Step 1: the local base station DU detects that the surrounding IoT noise rises above the threshold during uplink reception, meaning that the local base station is interfered by a remote base station in a certain area, called the local interfered base station as an interfered base station, and the remote interfering base station 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 used in other systems, the corresponding interface and message name will change accordingly. And then the interfered base station side DU and OAM are interacted to obtain configuration information of the RIM-RS, or the RIM-RS can be configured by itself according to a preset set ID, and RIM-RS transmission is started. Meanwhile, the interference base station side DU 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 that the RIM-RS has been received and that the local interfered base station remains to transmit the RIM-RS over the backhaul network. The information of the RIM-RS is firstly obtained at the DU side of the interference base station, however, the CU of the interference base station is connected with the 5G core network element, the CU is responsible for informing the interfered base station of the information received by the RIM-RS through a backhaul network, and the problem of how the base station processes the information under the CU-DU separated architecture is not related to the specification content of the RIM framework 2.1 at the present stage. By using the method of the invention on the interference base station side, the central unit equipment of the base station receives the information related to the receiving state of the reference signal sent by the distribution unit equipment of the base station, and the information related to the receiving state of the reference signal comprises RIM-RS receiving indication information. The DU needs to signal the CU through the F1 interface, and then the CU can transmit information back to the interfered base station side through the backhaul network. Assuming that the DU can interact with the OAM to acquire the interference coordination scheme and start application, the CU need not be notified.
When the interfered base station receives the state information of the RIM-RS, which is forwarded from the backhaul network and indicated to be received, the interfered base station is determined to continue transmitting the RIM-RS. The interfered base station side CU is connected to the 5G core network element, and the receiving indication information of the reference signal is obtained through the backhaul network CU, and the DU is responsible for transmitting the reference signal. The specification for RIM framework 2.1 at this stage does not relate to how the base station handles this problem under CU-DU split architecture. By the method of the interfered base station side, the distributed unit equipment of the base station receives the information related to the receiving state of the reference signal sent by the concentrated unit equipment of the base station, wherein the information related to the receiving state of the reference signal comprises RIM-RS receiving indication information. The CU may send a message to the DU indicating the RIM-RS reception status to the DU and then the DU decides to continue transmitting RIM-RS or directly instruct the DU to continue transmitting RIM-RS to monitor when the atmospheric waveguide phenomenon has disappeared. This indication message is not necessary because the DU is already in the state of transmitting RIM-RS, and if the mechanism on the DU side is that RIM-RS is not received or the RIM-RS indication message is stopped, the RIM-RS will be continuously transmitted until it is stopped. If there is a corresponding timer mechanism on the DU side, the RIM-RS receiving indication is not received or RIM-RS indication information is continuously transmitted before the timer is overtime, the DU stops transmitting the RIM-RS, and the RIM-RS indication information is optional.
Step 3: when the remote interference base station cannot receive the RIM-RS, the local interfered base station is informed of the disappearance of the RIM-RS 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 with the 5G core network element, and is responsible for informing the local interfered base station that the RIM-RS cannot receive the information through the backhaul network, and the specification content of the RIM framework 2.1 at the present stage does not relate to how the base station processes the information under the CU-DU separated architecture. By using the method of the invention on the interference base station side, the central unit equipment of the base station receives the information related to the receiving state of the reference signal sent by the distribution unit equipment of the base station, and the information related to the receiving state of the reference signal comprises RIM-RS disappearing indication information. The DU needs to signal the CU through the F1 interface, and then the CU can transmit information back to the interfered base station side through the backhaul network. Assuming that the DU directly releases the application of the interference coordination scheme to restore to the previous state when the RIM-RS is not monitored, and directly stops detecting the RIM-RS, the CU does not need to be notified.
Step 4: and after receiving the indication of the disappearance of the RIM-RS, the local interfered base station stops transmitting the RIM-RS. The interfered base station side CU first receives an indication of the disappearance of the RIM-RS transmitted over the backhaul network, while the DU is responsible for the stop transmission of the reference signal. The specification for RIM framework 2.1 at this stage does not relate to how the base station handles this problem under CU-DU split architecture. By the method of the interfered base station side, the distribution unit equipment of the base station receives the information related to the receiving state of the reference signal sent by the centralized unit equipment of the base station, and the information related to the receiving state of the reference signal comprises RIM-RS disappearing indication information. The CU needs to signal the DU through the F1 interface, indicate the RIM-RS erasure status to the DU and then the DU decides to stop transmitting the RIM-RS, or directly instruct the DU to stop transmitting the RIM-RS.
Summarizing the above procedure, it can be found that, for CU-DU split base stations, the F1 interface messages necessary for completing the whole RIM mechanism are as follows, and the information transferred to the DU for the interfered base station side CU at least includes one of the following:
■ Identification information of the reference signal (if the DU transmits a plurality of RIM-RSs at the same time, it is necessary to indicate which RIM-RS continues transmission or stops transmission);
■ The RIM-RS receives indication of RIM-RS information;
■ Continuing to transmit RIM-RS indication information;
■ Continuing to transmit information of a cell or frequency where the reference signal is located;
■ RIM-RS erasure indication (disappearance of RIM-RS) information;
■ Stopping transmitting RIM-RS indication information;
■ And stopping transmitting information of the cell or the frequency where the reference signal is located.
The information transferred to the CU for the interfering base station side DU at least includes one of:
■ Identification information of the reference signal (if the DU detects multiple RIM-RSs at the same time, it is necessary to indicate which RIM-RS is in a receiving or disappearing state);
■ The RIM-RS receives indication of RIM-RS information;
■ Detecting information of a cell or frequency where the RIM-RS is located;
■ RIM-RS erasure indication (disappearance of RIM-RS) information;
■ The information of the cell or the frequency where the RIM-RS disappears is not detected;
■ The interfered base station set ID (obtained by demodulating RIM-RS) (when only the interfered set ID is detected, the RIM-RS is implicitly indicated) (if the identification information of the reference signal includes the interfered base station set ID, this information does not need to be notified to the CU any more);
■ The interfering base station set ID (either OAM configured to the DU or DU preconfigured set ID. if detection or disappearance information of RIM-RS is transmitted to the interfered base station using the alternative backhaul Solution 1 mentioned in specification TR38.866 and not previously notified to the CU by other means such as F1 Setup procedure or if the information is updated, the CU must be notified of this information even if it is previously notified);
■ One or more tracking area identities ID/base station global identities ID information (DU and OAM cross-query gets one or more tracking area identities ID/base station global identities ID information mapped by the interfered base station set ID), which CU has to be informed if detection or disappearance information of the RIM-RS is transmitted to the interfered base station over the backhaul network using the alternative Solution 2 mentioned in the specification TR 38.866.
Fig. 7 depicts a fourth embodiment of the present invention. Fig. 7 depicts the overall flow triggered by the interfering base station detecting remote interference. The base station is separated into a base station centralized control unit CU and a base station distribution unit DU, one CU being connectable 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 used in other systems, the corresponding interface and message name will change accordingly. This embodiment assumes that the configuration information of the RIM-RS is obtained from the OAM at the CU, and the CU may autonomously configure an interference coordination (interference) scheme, or the CU obtains the interference coordination scheme from the OAM and sends it to the DU by the CU. And assume that the interfering base station and the interfered base station are located on the same AMF. And assuming that the interfered base station only suffers from the interference of the interfered base station in one far-end area, only transmitting the RIM-RS with one set ID at the DU side of the interfered base station, the interfered base station only generates remote interference to the interfered base station in one area, and only detecting the RIM-RS with one set ID at the DU side of the interfered base station.
Step 700, CU sends message to DU, and configures DU to make 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 remote interfering measurement configuration message to the DU, the message containing one or more of the following information:
measurement methods (e.g. measuring the average of remote interference noise suffered by symbols in an uplink subframe over a period of time);
reporting threshold or reporting condition, if the remote interference measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the remote interference measurement to the CU.
Or for remote interference detection, the DU can be resolved by the interference characteristics (one cell or multiple cells on the DU monitor that the symbol (symbol) in the uplink subframe is suffering from thermal noise interference (IoT: interference over thermal) on the air interface, and the state of gradually decreasing with the time domain of the symbol is presented, the noise power is gradually reduced from high to low, which indicates that the noise is caused by remote interference), so the DU can start the measurement configuration by itself, and the CU is not required to send a message to trigger the DU to perform remote interference measurement, that is, the 700 steps are not required to be executed.
The DU pre-configures a remote interference threshold, if the remote interference exceeds the set threshold (the threshold may be the absolute value of the remote interference, such as how much dBm, or the relative value is the minimum signal-to-noise ratio SNR required during uplink demodulation), the DU will trigger the 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 reporting the remote interference, the message 701 carrying one or more of the following information:
cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information where remote interference is detected);
interference measurements (e.g. interference noise power value, number of interfered symbols, signal-to-noise ratio at demodulation of the interfered symbols, etc.) per interfered cell.
The message 701 may carry information such as only the DU identification information, the base station DU ID, that detects the remote interference, or cell information that also carries the remote interference. If only the DU identification information is carried, the DU side has the cell information of detecting the remote interference, so that after the subsequent CU and OAM interactively acquire the RIM-RS configuration information, the information also indicates to the interfered DU to start transmitting the RIM-RS, or the information also indicates to the DU which does not detect the remote interference to start transmitting the RIM-RS. After the DU is indicated, a decision is made that RIM-RS will be transmitted on the interfered cell or on all cells under the DU. If the DU reports cell information that remote interference is detected to the CU as well, the CU, after having acquired the RIM-RS configuration, can directly indicate which cells on which DU to transmit the RIM-RS. The present embodiment assumes that there is interfered cell information on the CU side and the CU can directly instruct the DU on which cells to transmit RIM-RS.
The CU reports 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 indicating that the DU starts transmitting RIM-RS.
After the disturbed base station CU has the RIM-RS configuration information, a message is sent to the disturbed base station DU, where the message contains the configuration information of the RIM-RS, or possibly also the DU and the cell information of the transmitted RIM-RS. Message 702 carries one or more of the following information:
-interfered base station set ID (OAM configured to CU);
RIM-RS configuration information (OAM configured to CU);
-initiating transmission of an indication of RIM-RS;
initiating transmitting cell information of the RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information of the detected remote interference in step 701, the CU may directly indicate the cell information of the transmitting RIM-RS).
When a DU finds remote interference, in order to increase the signal energy of transmitting RIM-RS, it may be necessary that DUs in the vicinity of the DU also transmit the same RIM-RS signal, the DU informs the CU that the DU found remote interference, the CU decides the configuration information of the RIM-RS (or OAM configuration to the CU), and transmits the RIM-RS configuration information to all corresponding DUs.
After receiving the instruction of the CU, the DU decides to transmit the RIM-RS using the configured time-frequency resource on the cell designated by the CU, or on the cell where the remote interference is detected or on all cells under the DU if the CU is not designated. The DU may then send a response message to the CU initiating the 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 initiate transmission of RIM-RS (CU indicates that DU transmits RIM-RS, which informs CU when DU execution succeeds or fails)
Since there are multiple DUs that detect the existence of remote interference in the same area, and some DUs may be deployed under different base stations, the DUs that detect the remote interference perform the above steps with the connected CUs, and then the DUs obtain the same interfered base station set ID, the same time-frequency resource indication for transmitting RIM-RS, and start RIM-RS transmission.
When the interfered base station CU obtains the configured interfered base station set identification (interfered base station set ID) information from the OAM, it may be necessary to send the interfered base station set ID information to the core network node AMF to which the CU is connected.
After the interference base station CU acquires the interfered base station set ID from the RIM-RS received by the DU, the status information received by the RIM-RS needs to be notified to the interfered base station through the backhaul path. The interfered base station CU first sends the status information received by the RIM-RS and the interfered base station set ID information to the AMF, which needs to know which base stations are in the interfered base station set ID, so the AMF needs to acquire the base station identifier included in the interfered base station set ID, i.e. the base station ID, by using step 704.
Step 704: the interfered base station CU sends a message to the AMF.
The CU reports the configured interfered base station set ID information to the AMF over the Ng interface, and message 704 includes one or more of the following:
-an interfered set of base stations ID;
-base station ID.
Step 705: the CU of the interfering base station sends a message to the DU indicating to monitor the RIM-RS.
The DU may initiate RIM-RS detection based on the measurement configuration message received from the CU. The information related to RIM-RS measurement configuration may be OAM configured to CU, or may be transmitted to CU of the interfering base station by bachkaul signaling using an interfering base station set ID and an interfered set ID previously set after the interfered base station detects remote interference. The configuration information contains one or more of the following:
-measurement method (periodic monitoring of signals at specified time-frequency locations);
reporting threshold or reporting condition, if RIM-RS measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports RIM-RS measurement to the CU.
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 to transmit the RIM-RS on the air interface after receiving an indication to transmit the RIM-RS. Also, a base station (aggresor gNB) causing remote interference can receive RIM-RS on an air interface through the atmospheric waveguide phenomenon. When the DU of the interfering base station detects the RIM-RS for the first time on the air interface, the DU reports to 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 (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
-RIM-RS reception (reception of RIM-RS) indicates optional information, since when only the interfered base station set ID is present, also implicitly means RIM-RS detected;
-an interference coordination scheme request (optional information, when carrying measurement result information of the DU side RIM-RS, CU selects an appropriate interference coordination scheme according to the measurement result or CU gets the interference coordination scheme from OAM);
-cell information of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
cell measurement results (such as RIM-RS power value, delay, etc.) of each detected RIM-RS.
The information carried by message 706 may be the base station DU ID carrying only the DU identification information of the RIM-RS detected. Or also carries cell information for which RIM-RS is detected. If only the DU identification information is carried, the DU side has the cell information of the detected RIM-RS, and after the subsequent CU and OAM interactively acquire the interference coordination scheme, the DU of the detected RIM-RS is indicated to start executing the interference coordination scheme, and the DU of the undetected RIM-RS can be indicated to execute the interference coordination scheme. After the DU is indicated, the interference coordination scheme will be performed on the cell where the RIM-RS is detected or on all cells under the DU. If the DU reports the cell information of the detected RIM-RS to the CU as well, the CU can directly indicate which cells on which DU the interference coordination scheme is performed on when the interference coordination scheme is acquired. The present embodiment assumes that there is cell information of the RIM-RS detected on the CU side, and the CU may directly instruct the DU on which cells to perform the interference coordination scheme.
Then, the CU and OAM of the interfering base station interact to obtain the implemented interference coordination scheme and the configured interfering base station set ID. Or the CU may itself decide on the implemented interference coordination scheme and utilize the preconfigured 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 the 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 (either OAM configured to CU or CU preconfigured)
-performing an indication of an interference coordination scheme;
configuration information of the interference coordination scheme, such as one or more interference coordination schemes (without excluding interference coordination schemes newly incorporated into the specification as the study goes deep) (which may be OAM configured to the CU or configured by the CU according to RIM-RS measurements):
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Cell information to perform the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows that the cell information of the RIM-RS was received in step 706, it may directly indicate the cell information to perform the interference coordination scheme).
When a DU detects a RIM-RS, in order to expand the execution range of the interference coordination scheme, it may be required that a DU near the DU also executes the same interference coordination scheme, and the DU informs the CU that the DU finds the RIM-RS, the CU decides 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 the interference coordination scheme, the DU may perform the interference coordination scheme on all cells on or under the cell where the RIM-RS is detected. The DU may then send response information to the CU 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:
-performing response information of the interference coordination scheme.
Since there are multiple DUs of RIM-RS detected in the same area, and some DUs may be deployed in CUs under different base stations, the detected DUs of RIM-RS and the connected CUs execute the above steps, and then the DUs obtain the same interference base station set 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 CU knows from DU, DU detects RIM-RS, which indicates that the atmospheric waveguide phenomenon exists between the interfering base station and the interfered base station, the interfering base station needs to inform the interfered base station through the back signaling, the interfering base station has received RIM-RS, the atmospheric waveguide phenomenon still exists, the interfered base station needs to continue to send RIM-RS, so that the interfering base station can monitor when the atmospheric waveguide phenomenon disappears, and if the interfering base station can not receive RIM-RS, the atmospheric waveguide phenomenon is proved to have disappeared. The message of step 709 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS reception (reception of RIM-RS) indication information.
Since there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, each DU will send a message to the CU when detecting the RIM-RS, if each time the CU receives a report that the DU detects the RIM-RS, it initiates step 709 to send a message to the AMF, which will increase Ng interface signaling load. The CU of the interfering base station sends only one message to the AMF reporting that the RIM-RS was detected by the base station.
Step 710: the AMF forwards the message to the CU of the interfered base station.
When the AMF receives the request from the interfering base station, the RIM-RS reception status information is forwarded to the base stations included in the target interfered base station set ID, and the AMF already knows the base station information included in the interfered base station set ID, via step 704, so the message will be forwarded to the CU of the interfered base station. Message 710 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS reception (reception of RIM-RS) indication information.
Step 711: the CU of the interfered base station sends a message to the DU indicating that RIM-RS continues to be transmitted.
When the CU of the interfered base station receives the status information forwarded from the AMF indicating the RIM-RS, the CU can send a message to the DU indicating the RIM-RS receiving status to the DU and then the DU decides to continue transmitting the RIM-RS or directly indicates the DU to continue transmitting the RIM-RS to monitor when the atmospheric waveguide phenomenon occurs. This indication message is not necessary because the DU is already in the state of transmitting RIM-RS, and if the mechanism on the DU side is that RIM-RS is not received or the RIM-RS indication message is stopped, the RIM-RS will be continuously transmitted until it is stopped. If there is a corresponding timer mechanism on the DU side, the RIM-RS receiving indication is not received or RIM-RS indication information is continuously transmitted before the timer is overtime, the DU stops transmitting the RIM-RS, and the RIM-RS indication information is optional. The message contains the following first information or second and third information:
-RIM-RS reception (reception of RIM-RS) indication information;
-continuing to transmit the indication information of the RIM-RS;
cell information such as cell identification information (NR CGI, or PCI, or index) of continuing to transmit RIM-RS (optional information, if the CU already knows the cell information to initiate transmission of RIM-RS, the CU may directly indicate the cell information to continue to transmit RIM-RS).
After the DU gets the state information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, and the DU can decide on these cells to continue transmitting the RIM-RS.
Step 712: the DU of the interfering base station sends a message to the CU reporting RIM-RS reception.
If the atmospheric waveguide phenomenon still exists, the DU of the interfered base station still can detect the RIM-RS, and then the RIM-RS is reported to the CU, the steps 709 and 710 are continuously executed, the status information received by the RIM-RS is indicated to the CU of the interfered base station through the feedback signaling, and then the DU of the interfered base station is indicated to continuously transmit the RIM-RS through the optional step 711. Message 712 contains one or more of the following information:
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
the RIM-RS reception (reception of RIM-RS) indication information (optional information, since RIM-RS is also implicitly detected when only the interfered base station set ID is present).
Step 713: the DU of the interfering base station sends a message to the CU reporting the disappearance of the RIM-RS.
If the atmospheric waveguide phenomenon disappears, when all cells under the DU of the interfering base station 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. Message 713 contains one or more of the following information:
-interfered base station set ID (optional information, if the manner of detecting RIM-RS is implicitly indicated when only the interfered base station set ID is utilized, then the implicit indication of the disappearance of RIM-RS may also be utilized when no interfered base station set ID is present);
the RIM-RS disappearance (disappearance of RIM-RS) indication information (optional information, if the manner of implicitly indicating that the RIM-RS was detected when only the interfered base station set ID was utilized, can also be utilized when the interfered base station set ID was not 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 multiple cells under each DU. When all cells under the DU can not detect the state of the RIM-RS, the DU reports the state information of the RIM-RS disappeared to the CU, and similarly, when all the DU under the CU can not detect the state of the RIM-RS, the CU can trigger the step 716 to report the state information of the RIM-RS disappeared to the AMF.
Step 714: the CU of the interfering base station sends a message to the DU indicating the end of the interference coordination scheme.
When all cells under the interference 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, and then the CU indicates the DU to finish the interference coordination scheme. Message 714 contains one or more of the following information:
-ending the interference coordination scheme indication information;
cell information ending the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU has knowledge of the cell information starting to perform the interference coordination scheme,
cell information that may directly indicate the end of the interference coordination scheme).
Another way that may be taken is that the DU knows which cells are performing the interference coordination scheme, and when all cells cannot receive the RIM-RS, it indicates that for the area covered by all cells under this DU, the atmospheric waveguide phenomenon does not exist, the DU may 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 ended the interference coordination scheme.
The CU is instructed via the message DU of step 714 to end the interference coordination scheme. 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:
-ending the response information of the interference coordination scheme.
When all cells under the interfering base station 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 through step 713, and then the DU can decide to end the interference coordination scheme without the CU executing step 714 to instruct the DU to end the interference coordination scheme, and then sends a message to the CU. The message of step 715 in this case contains the following information:
-DU end interference coordination scheme notification information.
If a CU also indicates that an interference coordination scheme is applied on a DU in which a RIM-RS is not detected nearby after having obtained a report that the DU detected the RIM-RS, then for these stopping of the DU interference coordination scheme, the stopping of the interference coordination scheme must be triggered by the CU by performing steps 714 and 715. Because these DUs cannot detect the RIM-RS, nor can it detect when the RIM-RS has disappeared, a CU is required to control the execution and stoppage of the interference coordination scheme.
And stopping monitoring the RIM-RS after the DU finishes executing the interference coordination scheme and resumes the initial configuration.
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 state, it needs to inform the interfered base station of the RIM-RS vanishing state by backhaul signaling. The interfered base station is used for judging whether the transmitted RIM-RS is received at the side of the interfered base station, if not, the interference base station indicates that the atmospheric waveguide phenomenon disappears, and the RIM-RS needs to be stopped transmitting. Message 716 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS disappeared (disappearance of RIM-RS) indication information.
Because a plurality of interference base stations exist under each AMF, a plurality of DUs exist under each interference base station, when all DUs under one CU can not detect the RIM-RS, the CU can report the AMF to indicate the RIM-RS to disappear, and similarly, when all interference base stations under the AMF can not detect the RIM-RS, the step 717 can be triggered, and the AMF forwards the RIM-RS disappearing indication information to the interfered base station.
Step 717: the AMF forwards the message to the CU 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 set ID of the interfered base station through step 704, so that the AMF forwards the message to the CU of the interfered base station. Message 717 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS disappeared (disappearance of RIM-RS) indication information.
Step 718: the CU of the interfered base station sends a message to the DU indicating to stop transmitting RIM-RSs.
When the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates the RIM-RS to disappear, the information indicating the disappearance of the atmospheric waveguide phenomenon needs to be sent to the DU, or the CU directly indicates the DU to stop transmitting the RIM-RS. The message contains the following first information or second and third information:
-RIM-RS disappeared (disappearance of RIM-RS) indication information;
-ceasing to transmit the indication information of the RIM-RS;
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start transmitting RIM-RS, the CU may directly indicate to stop transmitting RIM-RS cell information).
After the DU gets the state 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 the RIM-RS.
If the message of step 718 carries a RIM-RS erasure (disappearance of RIM-RS) indication to the DU, after the DU stops transmitting the RIM-RS, a notification of the stop transmitting RIM-RS may be sent to the CU. 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 the DU to stop transmitting the RIM-RS, 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 a fifth embodiment of the present invention. Fig. 8 depicts the overall flow triggered by the interfering base station detecting remote interference. The base station is separated into a base station centralized control unit CU and a base station distribution unit DU, one CU being connectable 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 used in other systems, the corresponding interface and message name will change accordingly. This embodiment assumes that the DU obtains the configuration information of the RIM-RS from the OAM, and the DU itself can decide to configure the interference coordination mechanism or obtain the interference coordination scheme from the OAM. And assume that the interfering base station and the interfered base station are located on the same AMF. And assuming that the interfered base station only suffers from the interference of the interfered base station in one far-end area, only transmitting the RIM-RS with one set ID at the DU side of the interfered base station, the interfered base station only generates remote interference to the interfered base station in one area, and only detecting the RIM-RS with one set ID at the DU side of the interfered base station.
Step 800, the CU sends a message to the DU, and configures the DU to perform 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 remote interfering measurement configuration message to the DU, the message containing one or more of the following information:
Measurement methods (e.g. measuring the average of remote interference noise suffered by symbols in an uplink subframe over a period of time);
-reporting threshold or reporting condition, if the remote interference measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the remote interference measurement to the CU;
a threshold for transmitting RIM-RS, if the measurement of the DU meets the threshold, the DU may initiate the transmission of RIM-RS.
Or for remote interference detection, the DU can be resolved by the interference characteristics (one cell or multiple cells on the DU monitor that the symbol (symbol) in the uplink subframe is suffering from thermal noise interference (IoT: interference over thermal) on the air interface, and the state of gradually decreasing the noise power from high to low with the expansion of the symbol time domain is presented, which indicates that the noise is caused by remote interference), so the DU can start the measurement configuration by itself, and the CU is not required to send a message to trigger the DU to perform remote interference measurement, i.e. 800 steps are not required to be executed.
The DU pre-configures a remote interference threshold that will trigger the remote interference coordination mechanism if the remote interference exceeds a set threshold (this threshold may be the absolute value of the remote interference, e.g. how much dBm, or a relative value, e.g. the minimum signal to noise ratio SNR required for uplink demodulation). Or the DU is configured by receiving the CU, and performing 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. After detecting remote interference, the DU reports 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 detected remote interference is larger than the reporting threshold and smaller than the threshold of transmitting the RIM-RS, the DU can send a message to the CU to report the remote interference condition, and the CU waits for the CU to instruct the DU to transmit the RIM-RS. The message carries one or more of the following information:
cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information where remote interference is detected);
interference measurements (e.g. interference noise power value, number of interfered symbols, signal-to-noise ratio when the interfered symbols are demodulated, etc.) for 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 initiate the transmission of the RIM-RS.
The interfered base station DU reports to the CU that remote interference is detected, the CU sends a message to the interfered base station DU indicating that the DU starts transmitting RIM-RS, the message 802 carrying one or more of the following information:
-initiating transmission of an indication of RIM-RS;
Initiating transmitting cell information of the RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information of the detected remote interference in step 801, the CU may directly indicate the cell information of the transmitting RIM-RS).
After receiving the instruction of the CU, the DU transmits the RIM-RS on the cell designated by the CU by using the configured time-frequency resource. Or if the CU does not specify the cell information for transmitting the RIM-RS, the DU decides to transmit the RIM-RS by using the configured time-frequency resource 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 itself to start RIM-RS transmission, i.e. the CU configures the threshold for RIM-RS transmission in step 800, or the OAM configures the threshold for RIM-RS transmission and the configuration information of RIM-RS for the DU, the remote interference result of the DU detection satisfies the threshold for RIM-RS transmission (there is a threshold to be satisfied or there may not be a threshold to be set), the DU decides to start transmitting RIM-RS, steps 801 and 802 may not be performed. The execution of step 803 proceeds directly from step 800. The DU may inform the CU with the message of step 803, the configuration information of RIM-RS (OAM configured to the DU) decided by the DU. The message of step 803 carries one or more of the following information:
Cell information where remote interference is detected, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information where remote interference is detected);
interference measurements per interfered cell (optional information such as interference noise power value, number of interfered symbols, signal to noise ratio at demodulation of interfered symbols, etc.);
-DU initiation transmitting RIM-RS notification information;
-initiating transmitting cell information of RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores transmitting cell information of RIM-RS);
configuration information of RIM-RS (OAM configuration to DU);
interfered base station set ID (OAM configured to DU).
When a DU finds remote interference, in order to increase the signal energy of transmitting RIM-RS, it may be necessary for a DU in the vicinity of the DU to also transmit the same RIM-RS signal, the DU informs the CU that the DU decides RIM-RS configuration information (OAM configured to the DU) and the CU needs to forward the RIM-RS configuration information to other DUs.
If the DU initiates the transmission of the RIM-RS based on the message of step 802, this message may be a response message of step 802. The message of step 803 in this case contains one or more of the following information:
initiate transmission of response information of RIM-RS (if the CU indicates that the DU transmits RIM-RS, this information informs the CU when the DU execution succeeds or fails).
If the DU gets a CU indication to transmit RIM-RS for step 802 or if the DU can decide itself to transmit RIM-RS for step 803, 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 that detect the existence of remote interference in the same area, and some DUs may be deployed under different base stations, the DUs that detect the remote interference perform the above steps with the connected CUs, and then the DUs obtain the same interfered base station set ID, the same time-frequency resource indication for transmitting RIM-RS, and start RIM-RS transmission.
When the interfered base station CU obtains the configured interfered base station set ID information from the DU, it may be necessary to send the interfered base station set ID information to the core network node AMF to which the CU is connected.
After the interference base station CU acquires the interfered base station set ID from the RIM-RS received by the DU, the status information received by the RIM-RS needs to be notified to the interfered base station through the backhaul path. Firstly, the interfered base station CU sends the status 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 step 804.
Step 804: the interfered base station CU sends a message to the AMF.
The CU reports the configured interfered base station set ID information to the AMF over the Ng interface, and message 804 includes one or more of the following:
-an interfered set of base stations ID;
-base station ID.
Step 805: the CU of the interfering base station sends a message to the DU indicating to monitor the 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 configured to the CU, or may be sent to the CU of the interfering base station by bachkaul signaling by using a set ID of the interfering base station and a set ID of the interfered base station previously set after the interfering base station detects remote interference. The configuration information contains one or more of the following:
-measurement method (periodic monitoring of signals at specified time-frequency locations);
-reporting threshold or reporting condition, if RIM-RS measurement of the DU exceeds the threshold, the DU needs to report the measurement to the CU, or according to the reporting condition, the DU reports the RIM-RS measurement to the CU;
-a threshold for performing the interference coordination scheme, the DU may initiate the performance of the interference coordination scheme if the RIM-RS measurement of the DU meets the threshold.
Or the DU directly acquires the measurement configuration of the RIM-RS from the OAM, the monitoring of the RIM-RS is started, and the CU is not required to send a message to trigger the DU to detect the RIM-RS, namely 800 steps are not required to be executed.
When the interfered base station DU detects remote interference, the RIM-RS is already configured and starts to transmit on the air interface, and similarly, the base station (aggresor gNB) that causes remote interference may also receive the RIM-RS on the air interface through the atmospheric waveguide phenomenon. When the DU of the interfering base station detects the RIM-RS for the first time on the air interface, the DU reports the monitored RIM-RS information to the OAM, and obtains the configured interference coordination scheme and the allocated interfering base station set ID from the OAM, or the DU may configure the interference coordination scheme itself and use the preconfigured interfering base station set ID.
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 for the first time on the air interface, if the RIM-RS measurement result of the DU exceeds the reporting threshold (the threshold may be the absolute value of RIM-RS power, e.g. how many dBm), the DU needs to report to the CU, and the message 806 contains one or more of the following information:
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
a RIM-RS reception (reception of RIM-RS) indication (optional information, since when only the interfered base station set ID is present, also implicitly indicates that RIM-RS is detected);
-cell information of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
cell measurement results (optional information such as RIM-RS power value, delay, etc.) of each detected RIM-RS;
interference coordination scheme information for DU configuration, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the study proceeds) (the configuration of the interference coordination scheme may be OAM configured to the DU, or may be DU itself configured):
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Interfering base station set ID (either OAM configured to DUs or DUs preconfigured with set ID). Step 807: the CU of the interfering base station sends a message to the DU instructing the DU to initiate the execution of 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:
-performing an indication of an interference coordination scheme;
cell information, such as cell identification information (NR CGI, or PCI, or index), performing an interference coordination scheme (optional information, if the CU already knows the cell information of the received RIM-RS in step 806,
possibly directly indicating the cell information performing the interference coordination scheme).
After receiving the message 807, the interfering base station DU starts to perform the interference coordination scheme on the cell indicated by CU. If the CU does not have cell information indicating that the DU performs the interference coordination scheme, the DU may perform the interference coordination scheme on a cell where the RIM-RS is detected or a cell where the RIM-RS is not detected.
Step 808: the DU of the interfering base station sends a message to the CU informing the CU of the interference coordination scheme information that the DU starts to perform.
When the DU detects the RIM-RS, if the DU can automatically start to execute the interference coordination scheme, the DU does not need to request to 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 meets the threshold for performing the interference coordination scheme (the threshold needs to be met, or the threshold may not need to be set), then the DU will immediately start to perform the interference coordination scheme, steps 806 and 807 may not be performed, and the process proceeds directly from step 805 to perform step 808. The DU may inform the CU with the message of step 808 that the DU decides (or OAM configures to the configuration information of the DU) of the interference coordination scheme. The message of step 808 contains one or more of the following information:
-cell information of detected RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information of detected RIM-RS) (or frequency information of detected RIM-RS);
cell measurement results (optional information such as RIM-RS power value, delay, etc.) of each detected RIM-RS;
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
-a RIM-RS reception (reception of RIM-RS) indication;
-the DU performs interference coordination scheme notification information;
interference coordination scheme information for DU configuration, such as one or more of the following (without excluding interference coordination schemes newly incorporated into the specification as the study proceeds) (the configuration of the interference coordination scheme may be OAM configured to the DU, or may be DU itself configured):
time domain schemes, e.g. turning off interfering downlink symbols
-frequency domain scheme: e.g. changing the transmission band BWP
-power domain scheme: e.g. reducing the transmission power of the interfering downlink symbols
-spatial domain: e.g. changing beam parameters down-tilt
Cell information for performing the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, CU stores cell information for performing the interference coordination scheme);
Interfering base station set ID (either OAM configured to DUs or DUs preconfigured with set ID).
When a DU detects a RIM-RS, in order to expand the execution range of the interference coordination scheme, it may be necessary that a DU near the DU also executes the same interference coordination scheme, and the DU informs the CU of the interference coordination scheme configuration information decided by the DU (or configured by the OAM to 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, in order to expand the execution range of the interference coordination scheme, it may be required that a DU near the DU also executes the same interference coordination scheme, and the DU informs the CU that the DU finds the RIM-RS, the CU decides configuration information of the interference coordination scheme, and transmits the configuration information of the interference coordination scheme to all corresponding DUs.
If the DU is based on the message of step 807 that initiates execution of the interference coordination scheme, this message may be a response message of step 807. The message of step 808 in this case contains the following information:
-performing response information of the interference coordination scheme.
Since there are multiple DUs of RIM-RS detected in the same area, and some DUs may be deployed in CUs under different base stations, the detected DUs of RIM-RS and the connected CUs execute the above steps, and then the DUs obtain the same interference base station set 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 CU knows from DU, DU detects RIM-RS, which indicates that the atmospheric waveguide phenomenon exists between the interfering base station and the interfered base station, the interfering base station needs to inform the interfered base station through the back transmission signaling, the interfering base station has received RIM-RS, the atmospheric waveguide phenomenon still exists, the interfered base station needs to continuously transmit RIM-RS, so that the interfering base station can continuously monitor when the atmospheric waveguide phenomenon disappears, and if the interfering base station can not receive RIM-RS, the atmospheric waveguide phenomenon is proved to have disappeared. The message of step 809 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-a RIM-RS reception (reception of RIM-RS) indication.
Because there are multiple interfering base stations under each interfering base station set ID, there are multiple DUs under each interfering base station, each DU will send a message to the CU when detecting the RIM-RS, if each time the CU receives a report that the DU detects the RIM-RS, it initiates step 809 to send a message to the AMF, which will increase Ng interface signaling load. The CU of the interfering base station sends only one message to the AMF reporting that the RIM-RS was detected by the base station.
Step 810: the AMF forwards the message to the CU of the interfered base station.
When the AMF receives a request from the interfering base station to forward RIM-RS reception status information to the base station included in the destination interfered base station set ID, the AMF already knows the base station information included in the interfered base station set ID, and therefore forwards the message to the CU of the interfered base station, via step 804. Message 810 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of 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 indicating that RIM-RS continues to be transmitted.
When the CU of the interfered base station receives the status information forwarded from the AMF indicating the RIM-RS, the CU can send a message to the DU indicating the RIM-RS receiving status to the DU and then the DU decides to continue transmitting the RIM-RS or directly indicates the DU to continue transmitting the RIM-RS to monitor when the atmospheric waveguide phenomenon occurs. This indication message is not necessary because the DU is already in the state of transmitting RIM-RS, and if the mechanism on the DU side is that RIM-RS is not received or the RIM-RS indication message is stopped, the RIM-RS will be continuously transmitted until it is stopped. If there is a corresponding timer mechanism on the DU side, the RIM-RS receiving indication is not received or RIM-RS indication information is continuously transmitted before the timer is overtime, the DU stops transmitting the RIM-RS, and the RIM-RS indication information is optional. The message contains the following first information or second and third information:
-a RIM-RS reception (reception of RIM-RS) indication;
-continuing to transmit the indication information of the RIM-RS;
cell information such as cell identification information (NR CGI, or PCI, or index) of continuing to transmit RIM-RS (optional information, if the CU already knows the cell information to initiate transmission of RIM-RS, the CU may directly indicate the cell information to continue to transmit RIM-RS).
After the DU gets the state information received by the RIM-RS from the CU, the DU knows which cells are transmitting the RIM-RS, and the DU can decide on these cells to continue transmitting the RIM-RS.
Step 812: the DU of the interfering base station sends a message to the CU reporting RIM-RS reception.
If the atmospheric waveguide phenomenon still exists, the DU of the interfered base station still can detect the RIM-RS, and then the RIM-RS is reported to the CU, the steps 809 and 810 are continuously executed, the status information received by the RIM-RS is indicated to the CU of the interfered base station through the feedback signaling, and then the DU of the interfered base station is indicated to continuously transmit the RIM-RS through the optional step 811. Message 812 contains the following information:
-interfered base station set ID (obtained by demodulating RIM-RS) (also implicitly indicating that RIM-RS was detected when only interfered base station set ID;
a RIM-RS reception (reception of RIM-RS) indication (optional information, since when only the interfered base station set ID is present, also implicitly indicates that RIM-RS is detected).
Step 813: the DU of the interfering base station sends a message to the CU reporting the disappearance of the RIM-RS.
If the atmospheric waveguide phenomenon disappears, when all cells under the DU of the interfering base station 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. Message 813 contains one or more of the following information:
-interfered base station set ID (optional information, if the manner of detecting RIM-RS is implicitly indicated when only the interfered base station set ID is utilized, then the implicit indication of the disappearance of RIM-RS may also be utilized when no interfered base station set ID is present);
an indication of the disappearance of RIM-RS (disappearance of RIM-RS) (optional information, if the manner of detecting RIM-RS is implicitly indicated with the use of the set ID of interfered base stations only, then the implicit indication of the disappearance of RIM-RS with the use of the set ID of non-interfered base stations may also 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 multiple cells under each DU. When all cells under the CU can not detect the state of the RIM-RS, the DU reports the state information of the RIM-RS disappearance to the CU, and similarly, when all the DU under the CU can not detect the state of the RIM-RS, the CU can trigger the step 816 to report the state information of the RIM-RS disappearance to the AMF.
Step 814: the CU of the interfering base station sends a message to the DU indicating the end of the interference coordination scheme.
When all cells under the interference 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, and then the CU indicates the DU to finish the interference coordination scheme. Message 814 contains one or more of the following information:
-ending the interference coordination scheme indication information;
cell information ending the interference coordination scheme, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start performing the interference coordination scheme, it may directly indicate the cell information ending the interference coordination scheme).
Another way that may be taken is that the DU knows which cells are performing the interference coordination scheme, and when all cells cannot receive the RIM-RS, it indicates that for the area covered by all cells under this DU, the atmospheric waveguide phenomenon does not exist, the DU may 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 ended the interference coordination scheme.
The CU is instructed via the message DU of step 814 to end the interference coordination scheme. 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:
-ending the response information of the interference coordination scheme.
When all cells under the interference 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. The DU may then decide itself to end execution of the interference coordination scheme without the CU performing step 814 to instruct the DU to end the interference coordination scheme and then send a message to the CU. The message of step 815 in this case contains the following information:
-DU end interference coordination scheme notification information.
If the CU also indicates that the interference coordination scheme is applied on DUs that do not detect RIM-RS nearby after obtaining a report that the DUs detected RIM-RS, then for these DUs the stopping of the interference coordination scheme must be triggered by the CU by performing steps 814 and 815. Because these DUs cannot detect the RIM-RS, nor can it detect when the RIM-RS has disappeared, a CU is required to control the execution and stoppage of the interference coordination scheme.
And stopping monitoring the RIM-RS after the DU finishes executing the interference coordination scheme and resumes the initial configuration.
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 cannot detect the RIM-RS state, it needs to inform the interfered base station by backhaul signaling. The interfered base station is used for judging whether the transmitted RIM-RS is received at the side of the interfered base station, and if the interference base station cannot receive the RIM-RS, the interference base station indicates that the atmospheric waveguide phenomenon disappears, and the RIM-RS needs to be stopped from being transmitted. Message 816 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS disappeared (disappearance of RIM-RS) indication.
Because a plurality of interference base stations exist under each AMF, a plurality of DUs exist under each interference base station, when all DUs under one CU can not detect the RIM-RS, the CU can report the AMF to indicate the RIM-RS to disappear, and similarly, when all interference base stations under the AMF can not detect the RIM-RS, the step 817 can be triggered, and the AMF forwards the RIM-RS to the interfered base station.
Step 817: the AMF forwards the message to the CU of the interfered base station.
When all the interference base stations under the AMF can not detect the RIM-RS, the AMF forwards the RIM-RS disappearance indication to the interfered base stations. The amf has previously known the base station information contained in the interfered base station set ID, and therefore forwards the message to the CU of the interfered base station, via step 804. Message 817 contains one or more of the following information:
-interfering base station set ID;
-an interfered set of base stations ID;
-RIM-RS disappeared (disappearance of RIM-RS) indication.
Step 818: the CU of the interfered base station sends a message to the DU indicating to stop transmitting RIM-RSs.
When the CU of the interfered base station receives the state information which is forwarded from the AMF and indicates the RIM-RS to disappear, the information indicating the disappearance of the atmospheric waveguide phenomenon needs to be sent to the DU, or the CU directly indicates the DU to stop transmitting the RIM-RS. The message contains the following first information or second and third information:
-a RIM-RS vanishing (disappearance of RIM-RS) indication;
-ceasing to transmit the indication information of the RIM-RS;
cell information to stop transmitting RIM-RS, such as cell identification information (NR CGI, or PCI, or index) (optional information, if the CU already knows the cell information to start transmitting RIM-RS, the CU may directly indicate to stop transmitting RIM-RS cell information).
After the DU gets the state 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 the RIM-RS.
If the message of step 818 carries a RIM-RS erasure (disappearance of RIM-RS) indication to the DU, after the DU stops transmitting the RIM-RS, a notification of the stop transmitting RIM-RS may be sent to the CU. 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 the DU to stop transmitting the RIM-RS, 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 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, a distribution unit of an interfered base station proposed in 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 central unit apparatus of a base station; and performing or stopping transmission of the reference signal based on the information related to 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 present application. Referring to fig. 10, a centralized unit of an interfered base station proposed in 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 state from the central unit device of the interfering base station through the backhaul network; and controlling the apparatus to implement the method proposed in the present invention, for example, to perform transmission of information related to a reference signal reception state received by the distribution unit apparatus of the base station, so that the distribution unit apparatus of the base station performs or stops transmission of the reference signal based on the information related to 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, a distribution unit of an interfering base station proposed in 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 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.
Fig. 12 is a block diagram of a centralized unit of interfering base stations according to an embodiment of the present application. Referring to fig. 12, a centralized unit of an interfering base station proposed in 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 related to a reference signal reception state transmitted by the distribution unit apparatus of the base station, so that the distribution unit apparatus 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 central 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 their 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 the technical content of the present invention and for helping the 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 (26)
1. A method performed by an interfering base station for remote interference management, RIM, the method comprising:
receiving at least one RIM-reference signal RS from an interfered base station;
transmitting a message including RIM information from a distribution unit DU of the interfering base station to a concentration unit CU of the interfering base station; and
determining to stop monitoring the at least one RIM-RS based on the RIM information,
wherein the RIM information comprises an interfered base station set identification ID, status information regarding at least one RIM-RS, and information regarding an interfering cell detecting a status of at least one RIM-RS, and
Wherein the status information regarding the at least one RIM-RS includes the disappearance of the RIM-RS or the detection of the RIM-RS.
2. The method according to claim 1,
wherein the interfered set of base stations ID is used to identify a group of base stations transmitting the same RIM-RS.
3. The method according to claim 1,
wherein the information about the interfering cells relates to at least one cell global identifier CGI.
4. The method according to claim 1,
wherein determining to cease monitoring comprises ceasing monitoring when the status information regarding the at least one RIM-RS includes the disappearance of the RIM-RS.
5. The method of claim 1, further comprising:
a message including an interfering base station set identification ID is sent from the DU of the interfering base station to the CU of the interfering base station.
6. The method according to claim 5, wherein the method comprises,
wherein, the sending a message including the interference base station set identification ID from the DU of the interference base station to the CU of the interference base station includes: and F1 establishment related information is sent from the DU of the interference base station to the CU of the interference base station, wherein the F1 establishment related information comprises the ID of the interference base station set.
7. The method according to claim 5, wherein the method comprises,
wherein, the sending a message including the interference base station set identification ID from the DU of the interference base station to the CU of the interference base station includes: and sending a base station DU configuration update message from the DU of the interference base station to the CU of the interference base station, wherein the base station DU configuration update message comprises the ID of the interference base station set.
8. An interfering base station for performing a remote interference management RIM, the interfering base station comprising:
a transceiver; and
at least one controller coupled with the transceiver configured to:
the control transceiver receives at least one RIM-reference signal RS from the interfered base station,
controlling the transceiver to transmit a message comprising RIM information from the distribution unit DU of the interfering base station to the concentration unit CU of the interfering base station, an
Determining to stop monitoring the at least one RIM-RS based on the RIM information,
wherein the RIM information comprises an interfered base station set identification ID, status information regarding at least one RIM-RS, and information regarding an interfering cell detecting a status of at least one RIM-RS, and
wherein the status information regarding the at least one RIM-RS includes the disappearance of the RIM-RS or the detection of the RIM-RS.
9. The interfering base station of claim 8,
wherein the interfered set of base stations ID is used to identify a group of base stations transmitting the same RIM-RS.
10. The interfering base station of claim 8,
wherein the information about the interfering cells relates to at least one cell global identifier CGI.
11. The interfering base station of claim 8,
wherein the at least one controller is configured to stop monitoring when the status information regarding the at least one RIM-RS includes the disappearance of the RIM-RS.
12. The interfering base station of claim 8,
wherein the at least one controller is configured to control the transceiver to transmit a message comprising an interfering base station set identification, ID, from a DU of the interfering base station to a CU of the interfering base station.
13. The interfering base station of claim 12,
wherein the at least one controller is further configured to: the control transceiver sends an F1 establishment related message from the DU of the interfering base station to the CU of the interfering base station, wherein the F1 establishment related message comprises the ID of the set of interfering base stations.
14. The interfering base station of claim 12,
wherein the at least one controller is further configured to: the control transceiver transmits a base station DU configuration update message from the DU of the interfering base station to the CU of the interfering base station, the base station DU configuration update message including the interfering base station set ID.
15. A method performed by an interfered base station for remote interference management, RIM, the method comprising:
transmitting at least one RIM-reference signal RS to an interfering base station;
transmitting a message including RIM information from the central unit CU of the interfered base station to the distribution units DU of the interfered base station; and
determining to stop transmitting at least one RIM-RS based on the RIM information,
wherein the RIM information comprises an interfered base station set identification ID, status information about at least one RIM-RS, said status information comprising a disappearance of the RIM-RS or a detection of the RIM-RS.
16. The method according to claim 15,
wherein the interfered set of base stations ID is used to identify a group of base stations transmitting the same RIM-RS.
17. The method according to claim 15,
wherein determining to cease transmitting comprises ceasing transmitting when the status information regarding the at least one RIM-RS includes a disappearance of the RIM-RS.
18. The method of claim 15, further comprising:
a message including the interfered base station set identification ID is transmitted from the DU of the interfered base station to the CU of the interfered base station.
19. The method according to claim 18,
wherein transmitting a message including the interfered base station set identification ID from the DU of the interfered base station to the CU of the interfered base station includes: and sending an F1 establishment related message from the DU of the interfered base station to the CU of the interfered base station, wherein the F1 establishment related message comprises the interfered base station set ID.
20. The method according to claim 18,
wherein transmitting a message including the interfered base station set identification ID from the DU of the interfered base station to the CU of the interfered base station includes: a base station DU configuration update message is sent from the DU of the interfered base station to the CU of the interfered base station, the base station DU configuration update message including the interfered base station set ID.
21. An interfered base station for performing a remote interference management RIM, the interfered base station comprising:
A transceiver; and
at least one controller coupled with the transceiver configured to:
the control transceiver transmits at least one RIM-reference signal RS to the interfering base station,
controlling the transceiver to transmit a message comprising RIM information from the central unit CU of the interfered base station to the distribution unit DU of the interfered base station, and
determining to stop transmitting at least one RIM-RS based on the RIM information,
wherein the RIM information comprises an interfered base station set identification ID, status information about at least one RIM-RS, said status information comprising a disappearance of the RIM-RS or a detection of the RIM-RS.
22. The interfered base station of claim 21,
wherein the interfered set of base stations ID is used to identify a group of base stations transmitting the same RIM-RS.
23. The interfered base station of claim 21,
wherein the at least one controller is configured to control the transceiver to stop transmitting when the status information regarding the at least one RIM-RS includes the disappearance of the RIM-RS.
24. The interfered base station of claim 21,
wherein the at least one controller is configured to control the transceiver to transmit a message comprising the interfered base station set identification ID from the DU of the interfered base station to the CU of the interfered base station.
25. The interfered base station of claim 24, further comprising:
Wherein the at least one controller is further configured to: the control transceiver transmits an F1 setup-related message from the DU of the interfered base station to the CU of the interfered base station, the F1 setup-related message including the interfered base station set ID.
26. The interfered base station of claim 24, further comprising:
wherein the at least one controller is further configured to: the control transceiver transmits a base station DU configuration update message from the DU of the interfered base station to the CU of the interfered base station, the base station DU configuration update message including the interfered base station set ID.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| 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 |
| US16/834,851 US11516816B2 (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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| CN201910245228X | 2019-03-28 | ||
| CN201910245228 | 2019-03-28 |
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| Huawei.R3-186493 "gNB Grouping and Set ID Design".3GPP tsg_ran\wg3_iu.2018,(tsgr3_102),全文. * |
| Qualcomm Incorporated.R3-185515 "Configuration and coordination for RS transmission".3GPP tsg_ran\wg3_iu.2018,(tsgr3_101bis),全文. * |
| Qualcomm Incorporated.R3-186462 "Dynamic cell group configuration".3GPP tsg_ran\wg3_iu.2018,(tsgr3_102),参见第2-3节. * |
| ZTE. "R1-1808326 Consideration on reference signal design for remote interference management_final".3GPP tsg_ran\wg1_rl1.2018,全文. * |
| ZTE.R3-186498 "TP on Inter-gNB Coordination for RIM With Core Network Involvement".3GPP tsg_ran\wg3_iu.2018,(tsgr3_102),参见第2-5节. * |
| ZTE.R3-186510 "TP for Intra-cluster coordination".3GPP tsg_ran\wg3_iu.2018,(tsgr3_102),全文. * |
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