Downlink transmission control method and apparatus

Abstract

The present application relates to the technical field of communications, and relates in particular to a downlink transmission control method and apparatus, aimed at avoiding interference with normal uplink reception of other network devices during spread‑spectrum transmission. The method comprises: a first communication apparatus sending first indication information, the first indication information indicating a detection start frequency and a detection end frequency, wherein a frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink frequency band; the first communication apparatus receiving feedback information; and the first communication apparatus sending second indication information on the basis of the feedback information, the second indication information indicating an adjustment to a downlink transmission power.

Description

A downlink transmission control method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on March 25, 2024, with application number 202410353649.5 and application name "A Downlink Transmission Control Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a downlink transmission control method and device. Background Art

[0004] As the second-generation (2G) and third-generation (3G) communication technologies gradually withdraw from the communication network, operators can upgrade the frequency bands corresponding to 2G / 3G to the fourth-generation (4G) and fifth-generation (5G) communication technologies, and perform spectrum expansion (also known as frequency band extension) on the frequency bands corresponding to 4G / 5G to improve the communication effect of 4G / 5G.

[0005] However, spread spectrum can also present challenges, such as spurious interference. For example, expanding the downlink frequency band can cause downlink spurious signals to trigger uplink blockage on receivers of network devices in adjacent bands. Therefore, controlling downlink transmissions to avoid disrupting uplink reception on other network devices presents a challenge when using spread spectrum. Summary of the Invention

[0006] The embodiments of the present application provide a downlink transmission control method and apparatus to avoid affecting the normal uplink reception of other network devices during spectrum spreading.

[0007] In the first aspect, an embodiment of the present application provides a downlink transmission control method, which can be executed by a first communication device, which can be a device in a network device, for example, the first communication device can specifically be a baseband unit (BBU). Unless otherwise specified, the "first communication device" in this application can refer to the first communication device itself (such as BBU), or a component in the first communication device (such as a processor, chip, or chip system, etc.), or a logic module or software that can implement all or part of the functions of the first communication device. The method includes: the first communication device sends a first indication message, the first indication message indicates a detection start frequency and a detection end frequency, wherein the frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink communication frequency band; the first communication device receives feedback information; the first communication device sends a second indication message based on the feedback information, and the second indication message indicates adjustment of the downlink transmission power. Optionally, the first indication message also indicates a detection time.

[0008] Through the above method, the channel environment experienced by the transmitted signal and the received signal is the same or similar, and has the characteristic of reciprocity. By detecting the feedback information obtained from the signals transmitted by other devices (or equipment) in the downlink communication frequency band, the downlink transmission power of the downlink communication frequency band corresponding to itself can be adjusted. This can avoid the downlink transmission during spread spectrum from affecting the normal uplink reception of other devices (or equipment). At the same time, it can also achieve the maximum range of use of transmission power without affecting the normal uplink reception of other devices (or equipment).

[0009] In one possible design, the method further includes: the first communication device adjusting the downlink communication frequency band range according to the feedback information.

[0010] It can be understood that in the embodiment of the present application, the first communication device can not only adjust the downlink transmission power according to the feedback information, but also adjust the downlink frequency band range according to the feedback information, or adjust the downlink transmission power and the downlink communication frequency band range at the same time according to the feedback information.

[0011] Through the above design, it is also possible to utilize the fact that the channel environment experienced by the transmitted signal and the received signal is the same or similar, and has the characteristic of reciprocity. By detecting the feedback information obtained from the signals transmitted by other devices (or equipment) in the downlink communication frequency band, the downlink communication frequency band corresponding to itself is adjusted, which can avoid the downlink transmission during spread spectrum from affecting the normal uplink reception of other devices (or equipment). At the same time, it can also achieve the maximum utilization of spectrum resources without affecting the normal uplink reception of other devices (or equipment).

[0012] In one possible design, the feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band. Optionally, the feedback information comes from a second communication device (such as a radio frequency unit of a network device).

[0013] Through the above design, the first communication device can reverse the detection signal receiving power obtained by the second communication device to the air interface based on the detection signal obtained by the second communication device and the gain of each frequency in the detection signal by the second communication device, thereby determining the actual interference receiving power of the second communication device in the frequency range corresponding to the detection start frequency and the detection end frequency, which is conducive to more accurate adjustment of the downlink transmission power and / or downlink communication frequency band range.

[0014] In one possible design, the feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to a detection start frequency and a detection end frequency.

[0015] Through the above design, multiple frequency points can be determined through sampling and other methods within the frequency range corresponding to the detection start frequency and the detection end frequency. The feedback information can only include the receiving power of multiple frequency points, which can avoid the feedback of the detection signal of the entire frequency range corresponding to the detection start frequency and the detection end frequency, and can reduce the signaling overhead.

[0016] In one possible design, the first indication information also indicates a detection step, and the detection step indicates a sampling interval of multiple frequency points.

[0017] Through the above design, the detection step is indicated, which is conducive to the sender and receiver of the feedback information to align their understanding of the sampling of multiple frequency points within the frequency range corresponding to the detection start frequency and the detection end frequency.

[0018] In one possible design, before the first communication device receives the detection signal, the method also includes: the first communication device sends third indication information, the third indication information indicates the carrier carrying the detection signal; the first communication device receives the detection signal, including: the first communication device receives the detection signal carried by the carrier.

[0019] The above design helps the sender and receiver of the detection signal to align their understanding of the detection signal carrier, thereby improving the reliability of the detection signal feedback.

[0020] In one possible design, the method also includes: the first communication device broadcasts fourth indication information, the fourth indication information indicates a third frequency band set, the third frequency band set includes one or more third frequency bands, the third frequency band is an uplink communication frequency band that intersects with the second frequency band or an uplink communication frequency band adjacent to the second frequency band, and the second frequency band is a downlink communication frequency band for downlink transmission control; the first communication device receives fifth indication information, the fifth indication information indicates whether one or more third communication devices use the third frequency band set, wherein the one or more third communication devices include at least one target third communication device, the target third communication device uses the third frequency band set, and the downlink communication frequency band is the first frequency band; the first communication device sends sixth indication information, the sixth indication information indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device; wherein the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device are different.

[0021] Through the above design, it is possible to support the use of frequency division and / or time division to distinguish the signals transmitted by multiple target third communication devices in the first frequency band, and obtain feedback information corresponding to the multiple target third communication devices respectively, thereby avoiding the problem that the feedback information obtained is the weighted amount of multiple target third communication devices, which affects the accuracy of downlink transmission control.

[0022] In one possible design, the sixth indication information further indicates the sending frequency interval step corresponding to at least one target third communication device.

[0023] Through the above design, the transmission frequency interval step corresponding to the target third communication device to be detected can be indicated, so that the target third communication device to be detected transmits a signal that meets the detection requirements.

[0024] In one possible design, the first indication information also indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device; wherein the feedback information includes feedback information corresponding to at least one target third communication device.

[0025] Through the above design, the device sending feedback information (such as the second communication device) can learn the starting frequency offsets and / or detection time domain unit positions corresponding to multiple target third communication devices, and provide feedback on the detection results of multiple target third communication devices respectively.

[0026] In one possible design, the detection time domain unit is a frame, a half-frame, a subframe, a time slot, or a symbol.

[0027] Through the above design, time division of different granularities can be supported, and signals transmitted by multiple target third communication devices in the first frequency band can be distinguished to meet detection requirements in different scenarios.

[0028] In a second aspect, an embodiment of the present application provides a downlink transmission control method, which can be performed by a second communication device, which can be a device in a network device, for example, the second communication device can specifically be a radio unit (RU). Unless otherwise specified, the "second communication device" in this application can refer to the second communication device itself (such as RU), or a component in the second communication device (for example, a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the second communication device. The method includes: the second communication device receives first indication information, the first indication information indicates a detection start frequency and a detection end frequency, wherein the frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink communication frequency band; the second communication device sends feedback information, wherein the feedback information is determined by the second communication device based on the first indication information; the second communication device receives second indication information, and the second indication information indicates adjustment of the downlink transmission power. Optionally, the first indication information also indicates a detection time.

[0029] In one possible design, the feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band.

[0030] In one possible design, the feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to a detection start frequency and a detection end frequency.

[0031] In one possible design, the first indication information also indicates a detection step, and the detection step indicates a sampling interval of multiple frequency points.

[0032] In one possible design, before the second communication device sends the detection signal, the method also includes: the second communication device receives third indication information, the third indication information indicates the carrier carrying the detection signal; the second communication device sends the detection signal, including: the second communication device sends the detection signal carried by the carrier.

[0033] In one possible design, the first indication information also indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device, and the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device are different; wherein the feedback information includes feedback information corresponding to at least one target third communication device.

[0034] In one possible design, the detection time domain unit is a frame, a half-frame, a subframe, a time slot, or a symbol.

[0035] In a third aspect, embodiments of the present application provide a communication device having the functionality to implement the method of the first or second aspect described above. The functionality may be implemented through hardware or through hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functionality, such as an interface unit and a processing unit.

[0036] In one possible design, the device may be a chip or an integrated circuit.

[0037] In one possible design, the device includes a memory and a processor, the memory is used to store instructions executed by the processor, and when the instructions are executed by the processor, the device can perform the method of the first aspect or the second aspect.

[0038] In a fourth aspect, an embodiment of the present application provides a communication device, comprising an interface circuit and a processor, wherein the processor and the interface circuit are coupled to each other. The processor implements the method of the first or second aspect described above through a logic circuit or executing instructions. The interface circuit is configured to receive signals from other communication devices outside the communication device and transmit them to the processor, or to transmit signals from the processor to other communication devices outside the communication device. It will be understood that the interface circuit may be a transceiver, a transceiver, a transceiver, or an input / output interface.

[0039] Optionally, the communication device may further include a memory for storing instructions executed by the processor, or storing input data required by the processor to execute instructions, or storing data generated after the processor executes instructions. The memory may be a physically independent unit, or may be coupled to the processor, or the processor may include the memory (i.e., the processor and memory are integrated together).

[0040] In a possible implementation, the communication device is a chip.

[0041] In a fifth aspect, an embodiment of the present application provides a communication system, which includes a first communication device and a second communication device. The first communication device can implement the method of the first aspect above, and the second communication device can implement the method of the second aspect above.

[0042] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method of the first or second aspect mentioned above can be implemented.

[0043] In the seventh aspect, an embodiment of the present application further provides a computer program product, including a computer program or instructions, which, when executed by a processor, can implement the method of the first or second aspect above.

[0044] In the eighth aspect, an embodiment of the present application also provides a chip system, which includes a processor and an interface, and the processor is used to call and execute instructions from the interface. When the processor executes the instructions, the method of the above-mentioned first aspect or second aspect can be implemented.

[0045] The technical effects that can be achieved in the second to eighth aspects mentioned above can refer to the technical effects that can be achieved in the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0047] FIG2 is a schematic diagram of the network device structure provided in an embodiment of the present application;

[0048] FIG3 is a schematic diagram of an application scenario provided by an embodiment of the present application;

[0049] FIG4 is a schematic diagram of the spread spectrum requirements and uplink interference impact provided by an embodiment of the present application;

[0050] FIG5 is a schematic diagram of a downlink transmission power control method according to an embodiment of the present application;

[0051] FIG6 is a schematic diagram of a network device architecture provided in an embodiment of the present application;

[0052] FIG7 is a schematic diagram of calculating the transmission space interference path loss according to an embodiment of the present application;

[0053] FIG8 is a second schematic diagram of a downlink transmit power control method provided in an embodiment of the present application;

[0054] FIG9 is a schematic diagram of feedback information determination provided in an embodiment of the present application;

[0055] FIG10 is a third schematic diagram of a downlink transmit power control method according to an embodiment of the present application;

[0056] FIG11 is a schematic diagram of a network device network provided in an embodiment of the present application;

[0057] FIG12 is a schematic diagram of frequency division signals of a network device provided in an embodiment of the present application;

[0058] FIG13 is a schematic diagram of time division signals of a network device provided in an embodiment of the present application;

[0059] FIG14 is a fourth schematic diagram of a downlink transmit power control method provided in an embodiment of the present application;

[0060] FIG15 is a schematic diagram of a structure of a communication device according to an embodiment of the present application;

[0061] FIG16 is a second schematic diagram of the structure of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] The architecture of the communication system used in the embodiments of the present application can be shown in Figure 1. Communication system 1000 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, communication system 1000 may also include the Internet 300. RAN 100 includes at least one network device (such as 110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal device (such as 120a-120j in Figure 1, collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). Terminal device 120 is wirelessly connected to network device 110. Network device 110 is wirelessly or wiredly connected to core network 200. The core network devices in core network 200 and network device 110 in RAN 100 may be different physical devices, or they may be the same physical device that integrates core network logical functions and radio access network logical functions.

[0063] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as 4G, 5G, or an evolved system beyond 5G (e.g., a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a WiFi system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0064] It will be understood that FIG1 only illustrates one possible communication system architecture that may be applied in an embodiment of the present application. In other possible scenarios, the communication system architecture may also include other devices.

[0065] The network device 110 is a node in the radio access network (RAN), which can also be called an access network device or a RAN node (or device). The network device 110 is used to help terminal devices achieve wireless access. The multiple network devices 110 in the communication system 1000 can be nodes of the same type or different types. In some scenarios, the roles of the network device 110 and the terminal device 120 are relative. For example, the network element 120i in Figure 1 can be a helicopter or a drone, which can be configured as a mobile base station. For terminal devices 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal device. The network device 110 and the terminal device 120 are sometimes referred to as communication devices. For example, the network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and the network elements 120a-120j can be understood as communication devices with terminal device functions.

[0066] A network device can be a base station (BS), an evolved NodeB (eNodeB), a transmitting and receiving point (TRP), a transmitting point (TP), a next-generation NodeB (gNB), a base station in a future mobile communication system, a satellite, an access point (AP) in a WiFi system, an integrated access and backhaul (IAB) node, a mobile switching center, or a network device in a non-terrestrial network (NTN) communication system, i.e., it can be deployed on a high-altitude platform or satellite. A network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), a relay node or a donor node, or a wireless controller in a CRAN scenario. A network device can also function as a base station in device-to-device (D2D) communication, Internet of Vehicles (IoV) communication, drone communication, or machine communication. Optionally, a network device can be a server, a wearable device, a vehicle, or an onboard device. For example, the access network device in vehicle to everything (V2X) technology may be a road side unit (RSU).

[0067] In some implementations, taking the network device as a base station as an example, as shown in Figure 2, the base station may include one or more radio frequency units, such as a remote radio unit (RRU) 210 and one or more baseband units (BBU) (also called digital units, DU) 220. RRU 210 can also be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 211 and a radio frequency unit 212. The RRU 210 part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals, for example, for sending configuration information to terminal devices. The BBU 220 part is mainly used for baseband processing, controlling the base station, etc. The RRU 210 and the BBU 220 can be physically set together or physically separated, that is, a distributed base station.

[0068] The BBU 220 is the control center of the base station, which can also be called a processing module. It is mainly used to complete baseband processing functions such as channel coding, multiplexing, modulation, spread spectrum, etc.

[0069] In one example, the BBU 220 may be composed of one or more single boards, and the multiple single boards may jointly support a wireless access network of a single access standard (such as a 5G network), or may respectively support wireless access networks of different access standards (such as long term evolution (LTE), 5G network or other networks). The BBU 220 may also include a memory 221 and a processor 222. The memory 221 is used to store necessary instructions and data. The processor 222 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 221 and the processor 222 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards may share the same memory and processor. In addition, necessary circuits may be set on each single board.

[0070] In the embodiments of the present application, the form of the network device is not limited. The device used to implement the function of the network device can be a network device; it can also be a device that can support the network device to implement the function, such as a chip system. The device can be installed in the network device or used in conjunction with the network device.

[0071] The terminal device 120, which may also be referred to as a terminal, user equipment (UE), mobile station (MS), or mobile terminal (MT), can be a device for providing voice or data connectivity to a user, an IoT device, or a station (STA) in a WiFi system. For example, the terminal device includes a handheld device or vehicle-mounted device with wireless connectivity. Currently, terminal devices may include: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices (e.g., smart watches, smart bracelets, pedometers, smart glasses, etc.), vehicle-mounted devices (e.g., cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed trains, etc.), satellite terminals, virtual reality (VR) devices, augmented reality (AR) devices, smart point-of-sale (POS) machines, customer-premises equipment (CPE), wireless terminals in industrial control, smart home devices (e.g., refrigerators, televisions, air conditioners, electric meters, etc.), intelligent robots, robotic arms, workshop equipment, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and flying devices (e.g., intelligent robots, hot air balloons, drones, airplanes), etc. Terminal devices may also be other devices with terminal functions, for example, a terminal device may also be a device that functions as a terminal in D2D communication.

[0072] The embodiments of this application do not limit the device form factor of the terminal device. The device used to implement the functions of the terminal device can be the terminal device; it can also be a device that supports the terminal device to implement the functions, such as a chip system. The device can be installed in the terminal device or used in conjunction with the terminal device. In the embodiments of this application, the chip system can be composed of a chip or include a chip and other discrete components.

[0073] Based on the communication system architecture shown in Figure 1, Figure 3 exemplarily illustrates an application scenario applicable to the embodiments of the present application, including network device A and network device B, where network device A and network device B can be two different network devices included in Figure 1. When network device A performs spread spectrum on its downlink communication frequency band, it can use the downlink transmission control method provided in the embodiments of the present application to control the downlink transmission power, etc., to avoid affecting the normal uplink reception of network device B. In addition, it can be understood that in the embodiments of the present application, network devices can also be referred to as base stations, base station sites, or sites, etc. For example, network device A can also be referred to as site A, and network device B can also be referred to as site B.

[0074] 4, take the current spectrum of network device A including uplink communication frequency band (or uplink (UL) frequency band) of 824MHz-835MHz, downlink communication frequency band (or downlink (DL) frequency band) of 869MHz-880MHz, and the current spectrum of network device B including uplink communication frequency band of 885MHz-889MHz, downlink communication frequency band of 930MHz-934MHz as an example, with the continuous development of communication networks, 2G / 3G are gradually withdrawn from communication networks, and operators can upgrade the frequency bands corresponding to 2G / 3G to 4G / 5G, and spread the frequency bands corresponding to 4G / 5G, but they will encounter problems during the spread of spectrum: for example, the downlink communication frequency band of network device A is 869MHz-880MHz. When the 869MHz-884MHz band is expanded, the downlink communication frequency band of network device A expands, causing downlink spurious interference. This interferes with the uplink reception of network device B in the 885MHz-889MHz band, triggering uplink blocking of network device B's receiver and affecting the uplink reception performance of network device B for terminal devices. Spurious interference refers to interference caused by stray radiation outside the frequency band of one system falling within the reception band of another system. Therefore, how to control downlink emissions to avoid affecting the normal uplink reception of other network devices is a challenge faced during spectrum expansion.

[0075] It should be understood that the above communication frequency band range is only an example, and this application does not limit the communication frequency band range, and the communication frequency band range may also have other values. For example, the uplink communication frequency band included in network device A may also be 834MHz-835MHz, etc.

[0076] Based on this, the embodiment of the present application provides a downlink transmission control method and apparatus for guiding spectrum spreading and spreading power, so as to avoid affecting the normal uplink reception of other network devices during spectrum spreading. The embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0077] Furthermore, it should be understood that ordinal numbers such as "first" and "second" in the embodiments of this application are used to distinguish between multiple objects and are not used to define the size, content, order, timing, priority, or importance of the multiple objects. For example, the first frequency band and the second frequency band do not indicate a difference in priority or importance between the two frequency bands.

[0078] FIG5 is a schematic diagram of a downlink transmit power control method provided in an embodiment of the present application, the method comprising:

[0079] S501: The first communication device sends first indication information, and correspondingly, the second communication device receives the first indication information.

[0080] The first indication information may indicate a detection start frequency and a detection end frequency, where the frequency ranges corresponding to the detection start frequency and the detection end frequency are the entire set or a subset of the first frequency band, and the first frequency band is a downlink communication frequency band.

[0081] The downlink transmit power control method provided in the embodiment of the present application can be performed by a first communication device and a second communication device, wherein the first communication device and the second communication device can be devices in a network device, for example, the first communication device can be a baseband unit (such as a BBU, etc.) in the network device, and the second communication device can be a radio frequency unit (such as an RRU, an active antenna unit (AAU) or a remote radio head (RRH) in the network device). Unless otherwise specified, the "first communication device" in this application can refer to the first communication device (such as a BBU) itself, or a component in the first communication device (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the first communication device; the "second communication device" can refer to the second communication device (such as an RRU) itself, or a component in the second communication device (such as a processor, a chip, or a chip system, etc.), or a logical module or software that can implement all or part of the functions of the second communication device. Exemplarily, the first communication device and the second communication device can be the BBU and RRU of the first network device.

[0082] When the first network device performs spectrum spread, the frequency interval between the downlink communication frequency band of the first network device and the uplink communication frequency band of other network devices may decrease. The signal transmission of the first network device in its downlink communication frequency band may interfere with the reception of other network devices in the uplink communication frequency band, affecting the uplink reception performance of other network devices.

[0083] As an example: Referring to Figure 4, the uplink communication frequency band of network device B is 885MHz-889MHz, the downlink communication frequency band of network device A before spectrum spreading is 869MHz-880MHz, and the downlink communication frequency band after spectrum spreading is 869MHz-884MHz. The frequency interval between the downlink communication frequency band of network device A after spectrum spreading and the uplink communication frequency band of network device B is reduced. The signal transmission of network device A in its downlink communication frequency band after spectrum spreading will cause spurious interference to the reception of network device B in its uplink communication frequency band, thereby affecting the uplink reception performance of network device B. It should be understood that the above-mentioned communication frequency band range (for example, the uplink communication frequency band of network device B is 885MHz-889MHz) is only an example. This application does not limit the communication frequency band range, and the communication frequency band range can also be other values.

[0084] In an embodiment of the present application, the first network device can utilize the fact that the signal attenuation of the uplink and downlink between the two devices is the same or similar, and has the characteristic of reciprocity, and can control its own downlink transmission power and / or downlink communication frequency band by performing interference detection on the downlink communication frequency band of other network devices.

[0085] In one possible implementation, in order to reduce the resource overhead of interference detection, the first frequency band for interference detection can be the downlink communication frequency band of other network devices that are adjacent to the first network device (such as the distance from the first network device is less than a distance threshold), and / or the downlink communication frequency band of other network devices whose frequency interval between the corresponding downlink communication frequency band and the uplink communication frequency band of the first network device (which can be the uplink communication frequency band before or after spectrum spreading) is less than a frequency interval threshold. The frequency range corresponding to the detection start frequency and the detection end frequency can be the same as that of the first frequency band (i.e., the full set of the first frequency band), or it can be part of the first frequency band (i.e., a subset of the first frequency band).

[0086] Still taking the first network device as network device A as an example, as shown in Figure 4, taking the frequency interval between the downlink communication frequency band 869MHz-884MHz after spectrum expansion of network device A and the uplink communication frequency band 885MHz-889MHz of network device B as less than the frequency interval threshold (for example, less than 4MHz), the first network device (such as the first communication device in the first network device) can use the downlink communication frequency band 930MHz-934MHz of network device B as the first frequency band, and determine the detection start frequency band and the detection end frequency band according to the first frequency band. For example, the detection start frequency band is determined to be 930MHz and the detection end frequency band is determined to be 934MHz; or the detection start frequency band is determined to be 932MHz and the detection end frequency band is determined to be 934MHz, and so on. It should be understood that the above-mentioned communication frequency band range (for example, the uplink communication frequency band of network device B is 885MHz-889MHz) is only an example. This application does not limit the communication frequency band range, and the communication frequency band range can also be other values.

[0087] In a possible implementation, the first communication device of the first network device may send first indication information to the second communication device to instruct the second communication device to start interference detection. The first indication information may also be referred to as start information, start parameters, detection information, etc.

[0088] Exemplary: Referring to Table 1, the first indication information (startup parameter) may include (or indicate) a detection start frequency and a detection end frequency, wherein the detection start frequency may be used to determine a start frequency corresponding to interference detection, and the detection end frequency may be used to determine an end frequency corresponding to interference detection.

[0089] Table 1

[0090] S502: The second communication device sends feedback information, and correspondingly, the first communication device receives the feedback information, wherein the feedback information is determined by the second communication device according to the first indication information.

[0091] After receiving the first indication information, the second communication device may switch to the detection link, perform interference detection on the signals transmitted by other network devices, obtain a detection signal, and send feedback information including the detection signal to the first communication device. The detection signal may also be referred to as detection data, and may include the received power of each frequency of the second communication device within the frequency range corresponding to the detection start frequency and the detection end frequency.

[0092] In some implementations, in order to reduce the impact on the receiving service of the second communication device in the uplink communication frequency band of the first network device, the first indication information can also indicate the detection time (or detection time slice), and then instruct the second communication device to switch the detection link to perform interference detection at a specific detection time (or detection time slice).

[0093] Exemplary: The information included (or indicated) by the first indication information may also be as shown in Table 2. Relative to the first indication information shown in Table 1, the first indication information shown in Table 2 may also include (or indicate) a detection time (or a detection time slice), which is used for the second communication device to switch to the detection link for interference detection at a specific detection time (or detection time slice).

[0094] Table 2

[0095] After receiving the first indication information, the second communication device may also switch to the detection link at the detection time (or detection time slice) indicated by the first indication information, perform interference detection on the signals transmitted by other network devices, and obtain a detection signal.

[0096] In addition, it can be understood that the above-mentioned detection time can be a time range; the above-mentioned detection time slice can be a microscopic period of central processing unit (CPU) time allocated to each running process by the time-sharing operating system. The second communication device can switch to the detection link during the period of CPU time corresponding to the detection time slice, detect the signals transmitted by other network devices, and obtain a detection signal.

[0097] The detection signal obtained by the second communication device may be sent to the first communication device in an application exchange control (AXC) data format or in other data formats, which is not limited in this application.

[0098] In some implementations, to improve the reliability of detection signal reporting, the first communication device may further send third indication information to the second communication device. The third indication information may indicate the carrier carrying the detection signal. When the second communication device sends the detection signal to the first communication device, it may modulate the detection signal onto the carrier and then send the modulated signal to the first communication device. After receiving the signal from the second communication device, the first communication device may demodulate the signal and recover the detection signal carried by the carrier.

[0099] The third indication information may also be referred to as a pre-configuration parameter. As shown in Table 3, the third indication information (pre-configuration parameter) may include a carrier number, indicating a carrier carrying the detection signal (such as AXC data).

[0100] Table 3

[0101] In some implementations, considering that the second communication device contains devices such as a low noise amplifier (LNA), which may generate gain on the detection signal, the second communication device can also send frequency compensation information to the first communication device. The frequency compensation information can be used to indicate the gain corresponding to each frequency of the second communication device, which is used by the first communication device to correct the detection signal.

[0102] In addition, it can be understood that the frequency compensation information can be sent to the first communication device together with the detection signal (such as sent to the first communication device through the same message), or it can be sent to the first communication device separately (such as sent to the first communication device through different messages). This application does not limit the manner in which the second communication device sends the frequency compensation information to the first communication device.

[0103] Exemplary: As shown in Table 4, frequency compensation information (which may be referred to as frequency compensation table data parameters) may include frequency (one or more) and gain (one or more), where the frequency and gain may correspond one to one, and the gain represents the gain compensation of the corresponding frequency.

[0104] Table 4

[0105] In some implementations, considering that the receiving link of the second communication device of the first network device can only receive signals corresponding to the uplink communication frequency band of the first network device and is unaware of signals in other frequency bands, a detection link for interference detection can be added to the second communication device. For example, based on the first receiving link already existing in the second communication device for receiving the uplink communication frequency band corresponding to the first network device, a detection link for interference detection (i.e., a second receiving link) is added to the second communication device. The detection link can be used to receive signals in the downlink communication frequency band (e.g., the first frequency band) of other network devices.

[0106] As an example: Referring to the network device architecture diagram shown in Figure 6, the first communication device and the second communication device of the first network device can communicate through a common public radio interface (CPRI). The transmission link and the first receiving link of the second communication device can share a duplex interface module, which can include a transmit (TX) / receive (RX) interface A (TX / RXA) and a TX / RX interface B (TX / RXB). The transmission link of the second communication device can be composed of a transmit antenna channel A (transmit A, TXA), a transmit antenna channel B (transmit B, TXB), a power amplifier (PA), a duplex interface module and an antenna; the first receiving link of the second communication device can be composed of an antenna, a duplex interface module, a low noise amplifier (LNA), a receive antenna channel A (receive A, RXA) and a receive antenna channel B (receive B, RXB).

[0107] The second communication device may also include a second receiving chain (i.e., a detection chain), which may be composed of an antenna, a filter, an LNA, and a ferrite bead (FB). The filter can be adjusted based on the detection start frequency and detection end frequency indicated by the first communication device, filtering out signals within the frequency range corresponding to the detection start frequency and detection end frequency. When performing interference detection, the second communication device can filter the signal received by the antenna through the filter to obtain a signal within the frequency range corresponding to the start frequency and detection end frequency. After processing by the LNA and FB, the signal is sent to the first communication device via the high-speed interface module and CPRI.

[0108] In addition, it is understandable that if the existing receiving link of the second communication device can sense signals in other frequency bands, the detection link can also reuse the existing receiving link of the second communication device, and this application does not limit this.

[0109] S503: The first communication device sends second instruction information according to the feedback information, and correspondingly, the second communication device receives the second instruction information, wherein the second instruction information instructs adjustment of downlink transmission power.

[0110] Taking the feedback data including the detection signal as an example, after the first communication device receives the feedback information, it can correct the receiving power corresponding to each frequency in the detection signal according to the frequency compensation information, and obtain the interference receiving power of the second communication device in the frequency range corresponding to the detection start frequency and the detection end frequency based on the corrected receiving power corresponding to each frequency in the detection signal (such as obtaining the interference receiving power by summing the corrected receiving power of each frequency in the frequency range corresponding to the detection start frequency and the detection end frequency, etc.), and can determine the receiving space interference path loss (that is, the receiving space interference isolation) based on the interference receiving power.

[0111] As an example: the first communication device can Determine the receiving space interference path loss, where RxP represents the interference receiving power, the starting frequency can represent the detection starting frequency, the ending frequency can represent the detection ending frequency, TxP(τ) represents the total transmit power of other network devices (such as the second network device) in the frequency range from the starting frequency to the ending frequency, RxFilt(τ)dτ represents the receiving performance (such as frequency response, etc.) of the second communication device in the frequency range from the starting frequency to the ending frequency, and X(τ) represents the receiving space interference path loss.

[0112] In addition, the calculation formula of path loss (such as receiving space interference path loss) can be expressed as X = 20log 10 (D)+20log 10 (F)-N, where X represents the path loss to be calculated; D represents the distance between the two network devices for which the path loss needs to be calculated (the distance is a constant when the positions of the two network devices are fixed); F represents the signal frequency to be calculated; and N represents a constant, which is related to the spatial structure between the two network devices for which the path loss needs to be calculated and is a constant when the positions of the two network devices are fixed. The path loss calculation formula shows that the path loss is related to the distance, spatial structure, and frequency (or frequency band) used between the two network devices. Regardless of whether the second communication device of the first network device sends a signal to the second network device or receives a signal from the second network device, the distance and structure between the second communication device of the first network device and the second network device are usually consistent. Therefore, the transmission spatial interference path loss of the second communication device in its downlink communication frequency band (i.e., the second frequency band) can be determined based on the receiving spatial interference path loss of the second communication device through reciprocity calculation.

[0113] As an example: the first communication device can calculate the transmission space interference path loss according to the schematic diagram shown in FIG7. Determine the transmit spatial interference path loss in the second frequency band (the downlink communication frequency band of the first network device), where X′ represents the receive spatial interference path loss corresponding to the frequency range corresponding to the detection start frequency and the detection end frequency, X represents the transmit spatial interference path loss corresponding to the second frequency band, f1 represents the frequency range corresponding to the detection start frequency and the detection end frequency, and f0 represents the second frequency band.

[0114] After determining the transmission space interference path loss X, the first communication device can determine the interference reception power of the second network device in the second frequency band based on the transmission power of the second communication device in the second frequency band, the receiving performance of the second network device in the second frequency band, and the transmission space interference path loss X, and adjust the transmission power of the second communication device or the frequency band range of the second frequency band based on the interference reception power.

[0115] Exemplary: If the interference receiving power of the second network device in the second frequency band is greater than the allowed interference receiving power threshold, the first communication device can send a first indication message to the second communication device, instructing the second communication device to reduce the downlink transmission power, and / or the first communication device to reduce the frequency band range of the second frequency band, thereby reducing the interference receiving power of the second network device and avoiding affecting the normal uplink reception of the second network device.

[0116] If the interference receiving power of the second network device in the second frequency band is less than the allowed interference receiving power threshold, the first communication device can send a first indication message to the second communication device, instructing the second communication device to increase the downlink transmission power, and / or the first communication device to increase the frequency band range of the second frequency band, thereby maximizing the utilization of spectrum resources and power and improving the downlink communication effect.

[0117] The downlink power control method shown in FIG5 is described below with reference to the specific example shown in FIG8 . Referring to FIG8 , after the first communication device activates the interference detection function, the first communication device may send third indication information to the second communication device. The third indication information may indicate a carrier that carries the detection signal. After the second communication device receives the third indication information from the first communication device, it may create a carrier that carries the detection signal based on the third indication information and report frequency compensation information to the first communication device. After receiving the frequency compensation information from the second communication device, the first communication device may cache the frequency compensation information from the second communication device.

[0118] After the first communication device activates the interference detection function, it can start interference detection according to the customer's startup instructions or periodically, and send a first indication message to the second communication device. The first indication message can indicate the detection start frequency and detection end frequency, and can also indicate the detection time. The second communication device can switch to the detection link at the detection time, obtain a detection signal in the frequency range corresponding to the detection start frequency and the detection end frequency, and can send the detection signal to the first communication device through the carrier. After obtaining the detection signal, the first communication device can determine the received interference power, and correct the determined received interference power through the frequency compensation information reported by the second communication device, and determine the received spatial interference path loss based on the corrected received interference power. After determining the received spatial interference path loss, the first communication device can calculate the interference received power of the second network device in the second frequency band (the downlink communication frequency band of the first network device). And it can adjust the frequency band range of the second frequency band based on the interference received power of the second network device in the second frequency band, or send a second indication message to the second communication device to instruct to adjust the downlink transmit power corresponding to the second frequency band.

[0119] It should be understood that after the first communication device receives the detection signal, it can first correct the received power corresponding to each frequency of the detection signal according to the frequency compensation information, and then calculate the received interference power based on the corrected detection signal; it can also first determine the received interference power based on the detection signal, and then correct the received interference power based on the frequency compensation information. This application does not limit the method by which the first communication device determines the received interference power.

[0120] In addition, the above is explained using the example of feedback information including a detection signal sent by the second communication device to the first communication device. In some implementations, in order to save signaling overhead between the first communication device and the second communication device, the second communication device can also obtain the detection signal corresponding to the frequency range corresponding to the detection start frequency and the detection end frequency, correct the detection signal according to the frequency compensation information, and then sample the detection signal to obtain the receiving power of multiple frequency points, and send feedback information including the receiving power of multiple frequency points to the first communication device.

[0121] As an example: referring to the feedback information determination diagram shown in Figure 9, the second communication device can obtain the interference time domain signal through the detection link, and convert the interference time domain signal into an interference frequency domain signal through an algorithm such as fast Fourier transform (FFT), and perform frequency interception according to the detection start frequency and the detection end frequency to obtain a detection signal corresponding to the detection start frequency and the detection end frequency. The second communication device can correct the power of the detection signal according to the frequency compensation information, reversely deduct it to the air interface (i.e., the antenna port), and then perform frequency sampling according to the detection step, calculate the received power of each frequency point, obtain a combination of multiple frequency points + received power (i.e., a group of frequency points + received power), and can feed back the obtained combination of multiple frequency points + received power to the first communication device. The received power of any frequency point can be determined based on the total received power of the sampling interval centered on the frequency point, and the size of the sampling interval is equal to the detection step.

[0122] As shown in Table 5, the feedback information may include the receiving power of multiple frequency points (i.e., a set of receiving powers), and may also include the detection start frequency and the detection end frequency. The first communication device can calculate the receiving space interference path loss through the receiving power of multiple frequency points (such as obtaining the receiving space interference path loss by summing the receiving power of multiple frequency points), and then obtain the transmitting space interference path loss through reciprocity calculation.

[0123] Table 5

[0124] The detection step size may be defined by a protocol and pre-configured in the second communication device and the first communication device, or may be indicated by the first communication device, and this application does not limit this. As an example, referring to Table 6, the first indication information sent by the first communication device to the second communication device may also indicate a detection step size, which may be used by the second communication device to determine the sampling intervals for multiple frequencies and calculate the received power at each frequency.

[0125] Table 6

[0126] The downlink power control method shown in FIG5 is described below with reference to the specific example shown in FIG10. As shown in FIG10, the first communication device can send a first indication message to the second communication device according to the client's start-up instruction or periodically start interference detection. The first indication message can indicate the detection start frequency and the detection end frequency, and can also indicate the detection time and the detection step. The second communication device can switch to the detection link at the detection time to obtain the detection signal, perform frequency interception according to the detection start frequency and the detection end frequency, and obtain a detection signal corresponding to the detection start frequency and the detection end frequency. The second communication device can also correct the power of the detection signal according to the frequency compensation information, reversely deduce it to the air interface (i.e., the antenna port), and then perform frequency sampling according to the detection step, calculate the received power of each frequency, obtain a set of frequency + received power, and can feed back the obtained set of frequency + received power as feedback information to the first communication device.

[0127] The first communication device can determine the receive spatial interference path loss based on the received set of frequencies and receive power. After determining the receive spatial interference path loss, the first communication device can calculate the interference receive power of the second network device in the second frequency band (the downlink communication frequency band of the first network device). Based on the interference receive power, the first communication device can adjust the frequency band range of the second frequency band or send second instruction information to the second communication device, instructing it to adjust the downlink transmit power corresponding to the second frequency band.

[0128] As an example: Referring to Table 7, for the scheme for feedback detection signals shown in Figure 8 (Scheme 1), in a scenario where the detection bandwidth is 15.36 megabytes (M) (i.e., 15360 kilobytes (K)) and the detection time is 1ms, the detection signal (such as an in-phase / quadrature (IQ) signal) is transmitted with a 16-bit bit width as an example, where the detection signal (taking the IQ signal as an example) includes a real part and an imaginary part. For every 1K bandwidth, a 16-bit real part signal and a 16-bit imaginary part signal are transmitted, and the amount of transmitted data is 15360×(16+16) bits=552960 bits. For the solution of feeding back the received power of multiple frequency points shown in Figure 10 (Solution 2), in a scenario where the detection bandwidth is 30M and the detection time is 1ms, taking the detection step as one resource block (RB), one RB is 200K, and the received power of multiple frequency points is transmitted with a 16-bit bit width as an example, the amount of transmitted data is 150×(16+16)bit=4800bit. It can be seen that the solution of feeding back the received power of multiple frequency points shown in Figure 10 can save signaling overhead compared to the solution of feeding back the detection signal shown in Figure 8.

[0129] Table 7

[0130] Referring to the network device networking diagram shown in FIG11 , in actual network device deployment, in addition to the one-to-one networking arrangement of a first network device and a second network device as shown in FIG11A , there is also a one-to-many networking arrangement of a first network device and multiple second network devices (e.g., second network devices 1 through second network devices 4) as shown in FIG11B . In this one-to-many networking arrangement, the calculated receive spatial interference path loss is the weighted sum of the receive spatial interference path losses corresponding to the multiple second network devices (e.g., second network devices 1 through second network devices 4). Therefore, converting the one-to-many networking arrangement to a one-to-one networking arrangement for interference detection and accurately obtaining the receive spatial interference path loss corresponding to each second network device is of great significance for improving the accuracy of downlink transmission control.

[0131] In one possible implementation, the second communication device can split the detection signals from multiple second network devices by time division and / or frequency division, and the first communication device can obtain the receiving space interference path loss corresponding to each second network device based on the detection signals corresponding to the multiple second network devices.

[0132] Exemplarily: the first communication device of the first network device can broadcast (such as broadcasting through the second communication device) fourth indication information, and the fourth indication information can indicate a third frequency band set, the third frequency band set includes one or more third frequency bands, wherein the third frequency band is an uplink communication frequency band that intersects with the second frequency band or an uplink communication frequency band adjacent to the second frequency band.

[0133] The second network device (or the BBU of the second network device, also referred to as the third communication device) that receives the fourth indication information can reply with fifth indication information to the first communication device of the first network device, and the fifth indication information can indicate whether the second network device uses the third frequency band set.

[0134] It can be understood that the fifth indication information can indicate whether the third frequency band set is used through 1-bit indication information. For example, when the second network device uses any third frequency band in the third frequency band set, the 1-bit indication information can be set to 1 to indicate that the second network device uses the third frequency band set; when the second network device does not use any third frequency band in the third frequency band set, the 1-bit indication information can be set to 0 to indicate that the second network device does not use the third frequency band set.

[0135] Alternatively, the fifth indication information may also indicate whether the second network device uses the third frequency band set by indicating which third frequency band in the third frequency band set the second network device specifically uses. For example, if the second network device uses the third frequency band A in the third frequency band set, the fifth indication information may carry the frequency band number of the third frequency band A, indicating that the second network device uses the third frequency band set and specifically uses the third frequency band A. If the second network device does not use any third frequency band in the third frequency band set, the fifth indication information may not carry the frequency band number of any third frequency band, indicating that the second network device does not use the third frequency band set.

[0136] Exemplarily: As shown in Table 8, the fourth indication information (also referred to as a broadcast parameter) may include the frequency band numbers of one or more third frequency bands in the third frequency band set, indicating one or more third frequency bands expected to be affected by the second frequency band, wherein the one or more third frequency bands expected to be affected by the second frequency band may be an uplink communication frequency band that intersects with the second frequency band or an uplink communication frequency band adjacent to the second frequency band.

[0137] Table 8

[0138] Exemplary: As shown in Table 9, the fifth indication information (also referred to as a response parameter) may be as shown in Table 9, and the fifth indication information may include information on whether the second network device sending the fifth indication information uses the third frequency band set for broadcasting.

[0139] Table 9

[0140] As shown in Table 10, the fifth indication information (also referred to as a response parameter) may also be as shown in Table 10. The fifth indication information may include the frequency band number of the third frequency band specifically used by the second network device that sends the fifth indication information.

[0141] Table 10

[0142] For at least one target second network device using the same frequency band (such as the second frequency band), the first communication device of the first network device can send sixth indication information to at least one target second network device respectively. The sixth indication information sent to any target second network device can indicate the starting frequency offset and / or detection time domain unit position corresponding to the second network device, wherein the starting frequency offset and / or detection time domain unit position corresponding to different target second network devices are different.

[0143] Exemplary: The sixth indication information (also referred to as a scheduling table parameter) may be as shown in Table 11, and may include (or indicate) a starting frequency offset and a detection time domain unit position, wherein the starting frequency offset is used to indicate the frequency offset of the used frequency relative to the starting frequency, and the detection time domain unit position is used to indicate the time domain unit position used by the target second network device receiving the sixth indication information to send a signal (such as an orthogonal frequency division multiplexing (OFDM) signal). In addition, as shown in Table 11, the sixth indication information may also include (or indicate) the detection starting frequency, the detection ending frequency, and the transmission frequency interval step. The detection time domain unit is a frame, a half frame, a subframe, a time slot, or a symbol, and different target second network devices correspond to different starting frequency offsets.

[0144] Table 11

[0145] Through the sixth indication information shown in Table 11, the target second network device that receives the sixth indication information can determine the frequency band range of its own transmitted signal (such as an OFDM signal) for this interference detection by detecting the starting frequency and the detection end frequency; through the starting frequency offset, the target second network device can determine the subcarrier frequency of its own initial transmitted signal (such as the first OFDM) for this interference detection; by sending the frequency interval step, the target second network device can determine the interval between the subcarriers of the transmitted signal (such as the OFDM signal); by detecting the time domain unit, the target second network device can determine the time range of its own transmitted signal for this interference detection, such as a specific frame, subframe, symbol, etc.

[0146] As shown in Figure 12, since different target second network devices (such as second network device 1-second network device 3) correspond to different starting frequency offsets, the signals sent by different target second network devices are frequency divided, and the second communication device can distinguish the signals sent by different target second network devices.

[0147] Exemplary: The sixth indication information (also referred to as a scheduling table parameter) may also include (or indicate) a detection time domain unit position, as shown in Table 12, where the detection time domain unit positions corresponding to different target second network devices are different. In addition, the sixth indication information may also include (or indicate) information such as a detection start frequency and a detection end frequency.

[0148] Table 12

[0149] Through the sixth indication information shown in Table 12, the target second network device that receives the sixth indication information can determine the frequency band range of its own signal (such as an OFDM signal) sent for this interference detection by detecting the starting frequency and the detection end frequency; by detecting the time domain unit, the target second network device can determine the time range of its own signal sent for this interference detection, such as a specific frame, subframe, symbol, etc.

[0150] As shown in Figure 13, since different target second network devices (such as second network device 1-second network device 3) correspond to different starting frequency offsets, the signals sent by different target second network devices are time-divided, and the second communication device can distinguish the signals sent by different target second network devices.

[0151] In some implementations, in order to facilitate the second communication device to obtain the starting frequency offset and / or detection time domain unit position corresponding to at least one target second network device, the first indication information sent by the first communication device to the second communication device can also indicate the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device.

[0152] As an example: Referring to Table 13, the first indication information sent by the first communication device to the second communication device may also include an identifier (such as a number) of each target second network device and its corresponding sixth indication information (such as a scheduling table parameter), so that the second communication device can know the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device, and split out the signals sent by each target second network device.

[0153] Table 13

[0154] For at least one target second network device, the second communication apparatus may report feedback information to the first communication apparatus for each target second network device, where the feedback information may include the detection signal corresponding to the target second network device or the received power of multiple frequencies.

[0155] As an example: Referring to Table 14, the feedback information sent by the first communication device to the second communication device may include the identifier of the target second network device (such as a number), and the receiving power of multiple frequency points corresponding to the target network device (i.e., a set of receiving powers), and may also include the detection start frequency and the detection end frequency.

[0156] Table 14

[0157] Through the above method, the second communication device can split the detection signals from multiple second network devices by time division and / or frequency division. The first communication device can obtain the transmission space interference path loss corresponding to each second network device based on the detection signals corresponding to the multiple second network devices, thereby performing downlink transmission power control according to the transmission space interference path loss corresponding to each second network device, which is conducive to improving the accuracy of downlink transmission power control.

[0158] The downlink power control method shown in FIG5 is described below with reference to the specific example shown in FIG14. Referring to FIG14, after the first communication device of the first network device (the first communication device in FIG14 takes BBU0 as an example) activates the interference detection function, it can broadcast a fourth indication information. The fourth indication information can indicate the third frequency band (the uplink communication frequency band affected by the downlink communication frequency band of the first network device). After the second network device (one or more) receives the broadcasted fourth indication information, it can check whether the frequency band used by itself (or its own radio frequency unit) includes the third frequency band, and send a fifth indication information to the first communication device of the first network device. The fifth indication information can indicate whether the third frequency band is used. For at least one target second network device using the third frequency band, the first communication device of the first network device can perform detection scheduling planning, plan the starting frequency offset and / or detection time domain unit position corresponding to each target second network device, and send corresponding sixth indication information (i.e., scheduling information) to each target second network device. The sixth indication information sent to each target network device indicates the starting frequency offset and / or detection time domain unit position corresponding to the target second network device.

[0159] The first communication device of the first network device sends a first indication message to the second communication device (RRU0 is used as an example of the second communication device in Figure 14) according to the customer's start-up instruction or periodic interference detection. The first indication message can indicate the detection start frequency and the detection end frequency, and can also indicate the detection time and the detection step and the starting frequency offset and / or the detection time domain unit position corresponding to each target second network device. The second communication device can switch to the detection link at the detection time, obtain the detection signal corresponding to each target second network device according to the starting frequency offset and / or the detection time domain unit position corresponding to each target second network device, and can also correct the power of the detection signal according to the frequency compensation information, and reversely infer it to the air interface (i.e., antenna port), and then perform frequency sampling according to the detection step, calculate the received power of each frequency point, obtain a set of frequency points + received power for each target second network device, and can feed back the obtained set of frequency points + received power as feedback information to the first communication device.

[0160] The first communication device can determine the receive spatial interference path loss of each target second network device based on a set of received frequencies and received powers corresponding to each target second network device. After determining the receive spatial interference path loss, the first communication device can calculate the interference received power of the target second network device in the second frequency band (the downlink communication frequency band of the first network device). Based on the interference received power, the first communication device can adjust the frequency band range of the second frequency band or send second instruction information to the second communication device, instructing it to adjust the downlink transmit power of the corresponding second frequency band.

[0161] It is understood that in order to implement the functions in the above embodiments, the first communication device or the second communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0162] Figures 15 and 16 are schematic diagrams of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the first communication device or the second communication device in the above method embodiments, thereby also achieving the beneficial effects of the above method embodiments.

[0163] As shown in FIG15 , a communication device 1500 includes a processing unit 1510 and an interface unit 1520. The processing unit 1510 may be a processor or a processing circuit, and the interface unit 1520 may be a transceiver unit, an input / output interface, a transceiver, etc. The communication device 1500 may be used to implement the steps performed by the first communication device or the second communication device in the above-described embodiments.

[0164] When the communication device 1500 is used to implement the steps performed by the first communication device in the above embodiment:

[0165] Interface unit 1520 is configured to send first indication information, where the first indication information indicates a detection start frequency and a detection end frequency, where the frequency range corresponding to the detection start frequency and the detection end frequency is the entire set or a subset of a first frequency band, where the first frequency band is a downlink communication frequency band; and receive feedback information;

[0166] The processing unit 1510 is configured to send second indication information according to the feedback information, where the second indication information indicates adjusting the downlink transmit power. The interface unit 1520 is further configured to send the second indication information.

[0167] In one possible design, the processing unit 1510 is further used to adjust the downlink communication frequency band range based on feedback information.

[0168] In one possible design, the feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band.

[0169] In one possible design, the feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to a detection start frequency and a detection end frequency.

[0170] In one possible design, the first indication information also indicates a detection step, and the detection step indicates a sampling interval of multiple frequency points.

[0171] In one possible design, before receiving the detection signal, the interface unit 1520 is further configured to send third indication information, where the third indication information indicates a carrier carrying the detection signal;

[0172] When the interface unit 1520 receives the detection signal, it is specifically used to receive the detection signal carried by the carrier.

[0173] In one possible design, the first indication information also indicates the detection time.

[0174] In one possible design, the interface unit 1520 is also used to broadcast fourth indication information, the fourth indication information indicates a third frequency band set, the third frequency band set includes one or more third frequency bands, the third frequency band is an uplink communication frequency band that intersects with the second frequency band or an uplink communication frequency band adjacent to the second frequency band, and the second frequency band is a downlink communication frequency band for downlink transmission control; receive fifth indication information, the fifth indication information indicates whether one or more third communication devices use the third frequency band set, wherein the third communication devices using the third frequency band set include at least one target third communication device whose downlink communication frequency band is the first frequency band; and send sixth indication information, the sixth indication information indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device; wherein the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device are different.

[0175] In one possible design, the sixth indication information further indicates the sending frequency interval step corresponding to at least one target third communication device.

[0176] In one possible design, the first indication information also indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device; wherein the feedback information includes feedback information corresponding to at least one target third communication device.

[0177] In one possible design, the detection time domain unit is a frame, a half-frame, a subframe, a time slot, or a symbol.

[0178] When the communication device 1500 is used to implement the steps performed by the second communication device in the above embodiment:

[0179] The interface unit 1520 is configured to receive first indication information, where the first indication information indicates a detection start frequency and a detection end frequency, where the frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink communication frequency band;

[0180] The processing unit 1510 is configured to determine feedback information according to the first indication information; the interface unit 1520 is further configured to send the feedback information; and receive second indication information, where the second indication information indicates adjusting the downlink transmit power.

[0181] In one possible design, the feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band.

[0182] In one possible design, the feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to a detection start frequency and a detection end frequency.

[0183] In one possible design, the first indication information also indicates a detection step, and the detection step indicates a sampling interval of multiple frequency points.

[0184] In one possible design, before the interface unit 1520 sends the detection signal, it is also used to receive third indication information, where the third indication information indicates the carrier carrying the detection signal; when the interface unit 1520 sends the detection signal, it is specifically used to send the detection signal carried by the carrier.

[0185] In one possible design, the first indication information also indicates the detection time.

[0186] In one possible design, the first indication information also indicates the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device, and the starting frequency offset and / or detection time domain unit position corresponding to at least one target third communication device are different; wherein the feedback information includes feedback information corresponding to at least one target third communication device.

[0187] In one possible design, the detection time domain unit is a frame, a half-frame, a subframe, a time slot, or a symbol.

[0188] As shown in Figure 16, the present application also provides a communication device 1600, which includes a processor 1610 and may also include a communication interface 1620. The processor 1610 and the communication interface 1620 are coupled to each other. It is understandable that the communication interface 1620 can be a transceiver, an input / output interface, an input interface, an output interface, an interface circuit, etc. Optionally, the communication device 1600 may also include a memory 1630 for storing instructions executed by the processor 1610 or storing input data required by the processor 1610 to execute instructions or storing data generated after the processor 1610 executes instructions. The memory 1630 may be a physically independent unit coupled to the processor 1610, or the processor 1610 and the memory 1630 may be integrated together.

[0189] When the communication device 1600 is used to implement the steps performed by the first communication device and the second communication device in the above embodiments, the processor 1610 can be used to implement the functions of the above processing unit 1510, and the communication interface 1620 can be used to implement the functions of the above interface unit 1520.

[0190] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), logic circuits, field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0191] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal device. Of course, the processor and the storage medium can also be present in a network device or a terminal device as discrete components.

[0192] In the above embodiments, all or part of the embodiments can be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions can be transmitted from one network device, terminal, computer, server, or data center to another network device, terminal, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disk; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0193] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0194] Furthermore, it should be understood that in the embodiments of this application, the word "exemplary" is used to indicate an example, illustration, or description. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner.

[0195] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A downlink transmission control method, characterized in that: include: The first communication device sends first indication information, where the first indication information indicates a detection start frequency and a detection end frequency, wherein a frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink communication frequency band; The first communication device receives feedback information; The first communication device sends second indication information according to the feedback information, where the second indication information indicates adjusting downlink transmit power.

2. The method according to claim 1, wherein The method further comprises: The first communication device adjusts the downlink communication frequency band range according to the feedback information.

3. The method according to claim 1 or 2, wherein: The feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band.

4. The method according to claim 1 or 2, wherein: The feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to the detection start frequency and the detection end frequency.

5. The method according to claim 4, wherein The first indication information further indicates a detection step, and the detection step indicates a sampling interval of the multiple frequency points.

6. The method according to claim 3, wherein Before the first communication device receives the detection signal, the method further includes: The first communication device sends third indication information, where the third indication information indicates a carrier that carries the detection signal; The first communication device receiving the detection signal includes: The first communication device receives the detection signal carried by the carrier.

7. The method according to any one of claims 1 to 6, wherein The first indication information further indicates a detection time.

8. The method according to any one of claims 1 to 7, wherein The method further comprises: The first communication device broadcasts fourth indication information, where the fourth indication information indicates a third frequency band set, where the third frequency band set includes one or more third frequency bands, where the third frequency band is an uplink communication frequency band that intersects with the second frequency band or an uplink communication frequency band adjacent to the second frequency band, and the second frequency band is a downlink communication frequency band for performing the downlink transmission control; The first communication device receives fifth indication information, where the fifth indication information indicates whether one or more third communication devices use the third frequency band set, wherein the one or more third communication devices include at least one target third communication device, and the target third communication device uses the third frequency band set, and a downlink communication frequency band is the first frequency band; The first communication device sends sixth indication information, where the sixth indication information indicates a starting frequency offset and / or a detection time domain unit position corresponding to the at least one target third communication device respectively; The at least one target third communication device respectively corresponds to different starting frequency offsets and / or detection time domain unit positions.

9. The method according to claim 8, wherein The sixth indication information further indicates the transmission frequency interval step corresponding to each of the at least one target third communication devices.

10. The method according to claim 8 or 9, characterized in that The first indication information further indicates a starting frequency offset and / or a detection time domain unit position corresponding to each of the at least one target third communication device; The feedback information includes feedback information corresponding to the at least one target third communication device.

11. The method according to any one of claims 8 to 10, wherein: The detection time domain unit is a frame, a half frame, a subframe, a time slot, or a symbol.

12. A downlink transmission control method, characterized in that: include: The second communication device receives first indication information, where the first indication information indicates a detection start frequency and a detection end frequency, wherein a frequency range corresponding to the detection start frequency and the detection end frequency is a full set or a subset of a first frequency band, and the first frequency band is a downlink communication frequency band; The second communication device sends feedback information, wherein the feedback information is determined by the second communication device according to the first indication information; The second communication device receives second indication information, where the second indication information indicates adjusting downlink transmission power.

13. The method according to claim 12, wherein: The feedback information includes a detection signal and / or frequency compensation information, where the frequency compensation information indicates a gain corresponding to each frequency in the first frequency band.

14. The method according to claim 12, wherein: The feedback information includes received power of multiple frequency points, where the multiple frequency points are located within a frequency range corresponding to the detection start frequency and the detection end frequency.

15. The method according to claim 14, wherein The first indication information further indicates a detection step, and the detection step indicates a sampling interval of the multiple frequency points.

16. The method according to claim 13, wherein Before the second communication device sends the detection signal, the method further includes: The second communication device receives third indication information, where the third indication information indicates a carrier carrying the detection signal; The second communication device sending the detection signal includes: The second communication device sends the detection signal carried by the carrier.

17. The method according to any one of claims 12 to 16, wherein: The first indication information further indicates a detection time.

18. The method according to any one of claims 12 to 17, wherein The first indication information further indicates a starting frequency offset and / or a detection time domain unit position respectively corresponding to at least one target third communication device, and the starting frequency offset and / or the detection time domain unit position respectively corresponding to the at least one target third communication device are different; The feedback information includes feedback information corresponding to the at least one target third communication device.

19. The method according to claim 18, wherein The detection time domain unit is a frame, a half frame, a subframe, a time slot, or a symbol.

20. A communication device, characterized in that: The method comprises a unit or module for executing the method according to any one of claims 1 to 19.

21. A communication device, characterized in that: The method comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor, or to send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method according to any one of claims 1 to 19 through a logic circuit or execution instructions.

22. A computer program product, characterized in that The method comprises a computer program or an instruction, and when the computer program or the instruction is executed by a processor, the method according to any one of claims 1 to 19 is implemented.

23. A computer-readable storage medium, characterized in that The storage medium stores a computer program or instructions, and when the computer program or instructions are executed by a processor, the method according to any one of claims 1 to 19 is implemented.

24. A communication system, characterized in that: The communication system includes a first communication device and a second communication device; The first communication device is configured to perform the method according to any one of claims 1 to 11; The second communication device is configured to execute the method according to any one of claims 12 to 19.

Images