CN115941071A

CN115941071A - Symbol turn-off method, device, O-RU, electronic equipment and storage medium

Info

Publication number: CN115941071A
Application number: CN202211475656.XA
Authority: CN
Inventors: 冯桂柱
Original assignee: Sichuan Hengwan Technology Co Ltd
Current assignee: Sichuan Hengwan Technology Co Ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-04-07

Abstract

The embodiment of the invention discloses a symbol turn-off method, a device, an O-RU, electronic equipment and a storage medium, wherein the symbol turn-off technical scheme provided by the invention carries out empty symbol judgment on OFDM symbols in an ORAN radio frequency unit O-RU through self detection, and then generates a symbol turn-off control signal according to the judgment result to control a power amplifier to carry out symbol turn-off, so that the symbol turn-off of the ORAN radio frequency unit does not need the support of an ORAN interface protocol, does not depend on the real-time control message of an O-DU, does not need the control and participation of the O-DU, realizes the function decoupling of the O-DU and the O-RU on the symbol turn-off, solves the problem of power consumption of an ORAN network radio frequency unit, saves the power consumption, simultaneously also can support the symbol turn-off function when the O-RU equipment and the O-DU equipment of different manufacturers are interconnected, and embodies the spirit of opening and compatibility of the ORAN protocol.

Description

Symbol turn-off method, device, O-RU, electronic equipment and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a symbol turn-off method and apparatus, an O-RU, an electronic device, and a storage medium.

Background

The power saving technology is an important technology in 4G (fourth generation mobile communication system)/5G (fifth generation mobile communication system) deployment, especially a 5G base station based on a Massive multiple input multiple output (Massive MIMO) system, and huge power consumption has become an important obstacle for the 5G technology to obtain wider deployment.

Currently, the saving of power consumption can be referred to as a bottleneck technique for a base station radio unit (RRU or RU). In the prior art, power saving techniques that have been applied to base station rf units include TDD (Time Division Duplex) turn-off techniques, tidal base station techniques, and the like. The TDD switch-off technology may switch off a Power Amplifier (PA) and a downlink signal processing unit of the base station in an uplink time slot, and may switch off a Low Noise Amplifier (LNA) and an uplink signal processing unit of the base station in a downlink time slot; tidal base station technology can reduce the transmit power of the base station and shut down portions of the antenna channels in a multiple antenna system at night or other low traffic times.

In addition, the symbol turn-off technology is also a power consumption saving technology applied to the traditional 4G/5G base station radio frequency unit and the terminal equipment, and the symbol turn-off carries out dynamic turn-off processing on the processing units, especially Power Amplifiers (PAs), in the base station and the terminal equipment on the time dimension taking the symbol as granularity so as to improve the power efficiency of the equipment and achieve the purposes of energy saving and environmental protection. In the traditional 4G/5G network, the function of symbol cut-off is realized by requiring the close cooperative processing between a base band processing unit (BBU) and a base station radio frequency unit. Specifically, the baseband processing unit carries out overall planning and scheduling according to user services, determines which symbols do not need to transmit services so as to be turned off, and which symbols need to turn on a power amplifier and transmit services, generates corresponding symbol turn-off real-time control information according to service scheduling results through a symbol turn-off function in the baseband processing unit, then initiates an instruction through the baseband processing unit, informs a base station radio frequency unit through the real-time control information, and controls turn-off of the power amplifier through a switch.

However, in the conventional base station, since a Common Public Radio Interface (CPRI) Interface is provided between the baseband processing unit and the Radio frequency unit, and a real-time control message related to symbol turn-off in a CPRI protocol is generally a message that is self-defined by a device manufacturer, the symbol turn-off control message of the baseband processing unit can only be analyzed by the Radio frequency unit of the base station of the same device manufacturer. Fig. 1 is a diagram of a process for implementing a symbol turn-off function in a conventional 4G/5G base station radio frequency unit, specifically, as shown in fig. 1, the base station radio frequency unit receives and analyzes real-time control information from a CPRI interface to obtain a specific symbol turn-off parameter, and then transmits the symbol turn-off parameter to a switch controller, and the switch controller generates a corresponding power amplifier control switch according to a switch mode and the received symbol turn-off parameter to control the turn-off of a power amplifier, thereby implementing the symbol turn-off. In addition, the CPRI protocol is generally used for transmitting time domain data between a baseband unit and a radio frequency unit, and the radio frequency unit based on the CPRI protocol generally does not include IFFT conversion and other functions.

However, the implementation scheme of the symbol turn-off function cannot be directly applied to a base station in an ora network (i.e., an Open radio access network, open RAN), because a control plane message related to symbol turn-off has not been defined in an ora protocol, and the baseband processing unit and the base station radio frequency unit cannot perform cooperative processing on the symbol turn-off. Specifically, the ORAN network architecture is composed of Distributed units (O-DUs) and Radio frequency units (O-RUs). Wherein, the O-DU and O-RU are connected by using ORAN forward interface. Compared with the traditional CPRI (common public radio interface) protocol, the ORAN forward interface protocol is more open and more standardized, supports the equipment interconnection among different manufacturers, is greatly supported by a plurality of operators and equipment suppliers in various countries in the world, and is rapidly developed. Meanwhile, unlike the CPRI protocol that includes a large number of factory-defined control messages, the ora supports interconnection of different factory devices in order to reflect openness, and uses a general message type as much as possible in the control plane and management plane message definitions, thereby reducing the factory-defined messages. The current ORAN forward interface CUS protocol specification (O-ran. Wg4.Cus.0-v 08.00) does not define the message type of the symbol turn-off technology, which makes the power consumption saving technology and power consumption efficiency in the ORAN radio frequency unit fall behind the 4G/5G network radio frequency unit defined by 3GPP, and the O-RU cannot perform symbol turn-off by receiving the control message from the ORAN interface. In addition, different from the CPRI protocol, the ora protocol is generally used for transmitting frequency domain data between the baseband processing unit and the radio frequency unit, the radio frequency unit generally needs to include IFFT transformation and other functions, and part of the radio frequency units further include beamforming and other frequency domain signal processing functions.

Based on the above current situation, it is urgently needed to provide a symbol turn-off method for an ORAN network to solve the power consumption problem of a radio frequency unit in the ORAN network, further save power consumption, and solve the problem of a symbol turn-off function in an interconnection scenario of equipment of different manufacturers.

Disclosure of Invention

In view of this, the embodiments of the present invention provide a symbol turn-off method, apparatus, O-RU, electronic device, and storage medium, where the technical scheme of symbol turn-off provided by the present invention performs a null symbol judgment on an OFDM symbol through self-detection in an ORAN radio frequency unit O-RU itself, and then generates a symbol turn-off control signal according to the judgment result to come from a row control power amplifier to perform symbol turn-off, so that the symbol turn-off of the ORAN radio frequency unit does not need an ORAN interface protocol to support, and does not depend on a real-time control message of an O-DU, and does not need control and participation of the O-DU, thereby implementing function decoupling of the O-DU and the O-RU on symbol turn-off, solving the problem of power consumption of an ORAN network radio frequency unit, saving power consumption, and also enabling O-RU devices and O-DU devices among different manufacturers to support a symbol turn-off function when they are interconnected, and embodying the spirit of opening and compatibility of an ORAN protocol.

In a first aspect, an embodiment of the present invention provides a symbol turn-off method, which is applied to an ora radio frequency unit, where the ora radio frequency unit includes a power amplifier module, and the method includes:

judging whether the received OFDM symbol is a null symbol or not to obtain a judgment result;

generating a first symbol turn-off control signal according to the frame structure parameter of the wireless frame where the OFDM symbol is located and the judgment result;

performing time delay matching on the first symbol turn-off control signal to generate a second symbol turn-off control signal so as to align the second symbol turn-off control signal with an input signal which is input to the power amplifier module after the OFDM symbol is subjected to signal processing;

and controlling the power amplifier module to be switched off based on the second symbol switching-off control signal.

Preferably, the determining whether the received OFDM symbol is a null symbol specifically includes:

and judging whether the OFDM symbol is a null symbol according to the sum of squares of all frequency domain data in the OFDM symbol, and if the sum of squares of all frequency domain data in the OFDM symbol is less than or equal to a preset judgment threshold value, judging that the OFDM symbol is the null symbol.

Preferably, the generating a first symbol turn-off control signal according to the frame structure parameter of the radio frame in which the OFDM symbol is located and the determination result specifically includes:

generating a symbol counter and a symbol timer of the wireless frame according to the frame structure parameters of the wireless frame where the OFDM symbols are located;

generating the first symbol turn-off control signal according to the judgment result, the symbol counter and the symbol timer, wherein the state of the first symbol turn-off control signal comprises: an on state and an off state.

Preferably, the performing delay matching on the first symbol turn-off control signal specifically includes:

and performing time delay matching on the first symbol turn-off control signal through a buffer configured based on a preset time delay matching value in advance.

Preferably, the controlling the turning off of the power amplifier module based on the second symbol turn-off control signal specifically includes:

when the ORAN radio frequency unit supports an FDD mode, directly inputting the second symbol turn-off control signal to the power amplification module so as to control the turn-off of the power amplification module;

when the ORAN radio frequency unit is an ORAN radio frequency unit supporting a TDD mode, the ORAN radio frequency unit comprises a TDD switch controller, and a power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal are logically combined to generate a third symbol turn-off control signal, and then the third symbol turn-off control signal is input to the power amplifier module, so that the third symbol turn-off control signal controls the turn-off of the power amplifier module.

Preferably, the logically combining the power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal specifically includes:

and when the power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal are in an on state at the same time, the third symbol turn-off control signal is in an on state, and otherwise, the third symbol turn-off control signal is in an off state.

Preferably, when the ORAN radio frequency unit includes a precoding function module or a beamforming function module, the OFDM symbol is an OFDM symbol processed by the precoding function module or the beamforming function module.

In a second aspect, an embodiment of the present invention provides a symbol turn-off device, which is disposed in an ora radio frequency unit, where the ora radio frequency unit includes a power amplifier module, and the device includes:

a null symbol detector configured to determine whether the received OFDM symbol is a null symbol, and obtain a determination result;

a symbol turn-off control signal generator, configured to generate a first symbol turn-off control signal according to the frame structure parameter of the radio frame where the OFDM symbol is located and the determination result;

the time delay matcher is configured to perform time delay matching on the first symbol turn-off control signal to generate a second symbol turn-off control signal, so that the second symbol turn-off control signal is aligned with an input signal input to the power amplifier module after the OFDM symbol is subjected to signal processing;

and the power amplifier turn-off control module is set to control the turn-off of the power amplifier module based on the second symbol turn-off control signal.

In a third aspect, an embodiment of the present invention provides an O-RU, including at least: symbol turn-off device as described in the second aspect.

In a fourth aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, the memory being configured to store one or more computer program instructions, wherein the one or more computer program instructions are executed by the processor to implement the method according to the first aspect.

In a fifth aspect, an embodiment of the present invention provides a storage medium, where the storage medium is used to store a computer program, and the computer program is used to implement the method described in the first aspect.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a diagram of a symbol turn-off function implementation process in a conventional 4G/5G base station RF unit;

fig. 2 is a block diagram of a downlink signal processing procedure in an ora radio unit supporting FDD mode;

fig. 3 is a block diagram of a process for implementing the switch control function of the downlink signal processing and power amplifier in the ora radio unit supporting the TDD mode;

FIG. 4 is a flow chart of a symbol turn-off method according to an embodiment of the present invention;

fig. 5 is a diagram of a mapping relationship between OFDM symbols and corresponding symbol turn-off control signals in a radio frame according to a specific exemplary embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a symbol turn-off device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an O-RU according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another O-RU in accordance with an embodiment of the present invention;

fig. 9 is a schematic diagram of a hardware structure of the electronic device according to the embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Meanwhile, it should be understood that, in the following description, the "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that the two be absent intermediate elements.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 2 is a block diagram of a downlink signal processing procedure in an ora radio unit supporting FDD mode, specifically as shown in fig. 2: the implementation process of the downlink signal processing comprises an ORAN interface, user data, phase compensation, IFFT transformation, ping-pong cache and cyclic prefix insertion, a channel filter, digital up-conversion, peak clipping and digital pre-distortion, digital-to-analog conversion, radio frequency front end signal processing, power amplification and the like. For the ora radio unit supporting the TDD mode, compared with the ora radio unit supporting the FDD mode, a TDD switch controller is added, and specifically, as shown in fig. 3, the ora radio unit generates a radio switch control signal by using parameters such as a switch control mode in a management plane (M-plane) message included in an ora interface, where the radio switch control signal includes a switch signal for controlling a power amplifier PA, and the switch signal for controlling the power amplifier PA is responsible for switching on the power amplifier in a downlink time slot, and the uplink time slot Guan Gongfang is a power amplifier switch using the time slot as time granularity.

In order to apply the symbol turn-off power consumption saving technique in the ora radio unit, the inventor researches and discovers that although the ora protocol does not define the message type related to the symbol turn-off function, the interface division based on the frequency domain data transmission adopted in the ora network causes the total time delay of signal processing in the O-RU to be larger than the time length of one symbol, which makes the O-RU possible by performing self-detection on the symbol data and performing symbol turn-off according to the detection result.

Fig. 4 is a flowchart of a symbol turn-off method according to an embodiment of the present invention. The symbol turn-off method provided by the embodiment of the invention is applied to an ORAN radio frequency unit, wherein the ORAN radio frequency unit comprises a power amplifier module, and particularly as shown in figure 4, the method comprises the following steps:

step S410: and judging whether the received OFDM symbol is a null symbol or not to obtain a judgment result.

The OFDM symbol refers to the OFDM symbol in the frequency domain data in the same antenna, which is obtained by sending the O-DU to the ORAN radio frequency unit O-RU and processing the O-RU by a user data module in the O-RU. When one carrier is present in the same antenna, "OFDM symbol" refers to the OFDM symbol of that carrier; when the same antenna has multiple carriers, "OFDM symbol" refers to OFDM symbols of all carriers of the antenna. In addition, when the ORAN network radio frequency unit includes a pre-coding function module or a beam forming function module, the OFDM symbol is an OFDM symbol after frequency domain data sent to the O-RU by the O-DU is processed by the user data module and then by the pre-coding function module or the beam forming function module, so that a symbol turn-off function is independently provided on each antenna channel, and independent symbol turn-off between each power amplifier is realized.

In step S410, the basis for determining whether the OFDM symbol is a null symbol is to determine whether the OFDM symbol contains service data, if the OFDM symbol contains service data, the OFDM symbol is not a null symbol, and if the OFDM symbol does not contain service data, the OFDM symbol is a null symbol.

In one specific example, the power of each OFDM symbol is detected to determine whether the OFDM symbol is a null symbol. Specifically, whether the OFDM symbol is a null symbol is judged according to the sum of squares of all frequency domain data in the OFDM symbol, and if the sum of squares of all frequency domain data in the OFDM symbol is less than or equal to a preset judgment threshold value, the OFDM symbol is judged to be a null symbol.

The symbol power calculation formula is as follows:

wherein, P ^l Is the power of the l symbol, X ^l (k) Frequency domain data of the K RE of the l symbol, n _RE Is the number of frequency domain REs in the lth symbol.

By adding P ^l And comparing the OFDM symbol with a given preset decision threshold value to judge whether the OFDM symbol is a null symbol.

Wherein, P _th To preset a decision threshold, P _th Any power threshold value greater than or equal to 0 can be configured according to system requirements.

It should be noted that: when judging whether the OFDM symbol is a null symbol, it is necessary to wait for the frequency domain data of all REs in the OFDM symbol to be collected to judge the null symbol.

Step S420: and generating a first symbol turn-off control signal according to the frame structure parameter of the wireless frame where the OFDM symbol is located and the judgment result.

The data received by the ORAN radio frequency unit from the ORAN interface may be out of order, and the received data needs to be rearranged in the downlink signal processing module according to a specific time sequence and then sent out.

Wherein the state of the symbol turn-off control signal comprises: an on state and an off state. In one specific example, the symbol off control signal state corresponding to the null symbol is an off state (state 0) and the symbol off control signal state corresponding to the non-null symbol is an on state (state 1).

Specifically, firstly, a symbol counter and a symbol timer of the radio frame are generated according to the frame structure parameter of the radio frame where the OFDM symbol is located.

In mobile communication, data is transmitted in units of radio frames on a wireless network for both 4G and 5G, but the radio frame structures of 4G and 5G are different from each other. The method comprises the following specific steps:

1. for 4G, the 4G includes TDD and FDD, radio frames of both systems are 10ms long, each radio frame includes 10 subframes, each subframe (subframe) is composed of 2 consecutive slots, and each slot is 0.5ms long. Meanwhile, each slot is composed of a certain number of OFDM symbols including a Cyclic Prefix (CP). If the system is a Normal CP type (Normal CP type), each slot includes 7 OFDM symbols, and if the system is an Extended CP type (Extended CP type), each slot includes 6 OFDM symbols. In addition, the CP length at the front of the first OFDM symbol of each slot is 160 × ts for Normal CP type, the other CP length is 144 × ts, and the length of each CP is 512 × ts for Extended CP type. Where Ts is the sampling interval. In addition, in the TDD scheme, in addition to the uplink subframe and the downlink subframe, there is a special subframe, which is composed of DwPTS, GP, and UpPTS, and in one radio frame, which subframes or time slots are used for uplink data, which subframes or time slots are used for downlink data, and which subframes or time slots are special subframes, which can be configured based on uplink and downlink matching parameters.

2. For 5G, as with LTE, the length of the 5G radio frame and subframe is fixed, allowing better preservation of coexistence between 4G and NR, except that the 5G NR defines a flexible sub-architecture, and the slot and symbol period can be flexibly defined according to the subcarrier spacing, SCS, where:

● Wireless frame =10 (ms)

● Subframe =1 (ms)

● Slot =12 or 14 symbol periods (ms)

● Symbol period =1/SCS + CP length (ms)

Compared to 4G LTE, the 5G NR supports a number of different types of subcarrier spacing SCS. The 5G uses μ as a parameter to express the carrier spacing, for example, μ =0 represents 15kHz equivalent to LTE, and the other configurations are shown in the following table:

μ	Δf＝2 ^u
		0	15
1	30
		2	60
3	120
		4	240

according to the formula: symbol period =1/SCS + CP length, it can be seen that as μ varies, the symbol period varies proportionally, and the corresponding CP also varies proportionally. That is, as the subcarrier spacing increases, the time slots become shorter, and therefore, different numbers of time slots are set in the same subframe. In addition, another parameter that varies with the parameter set is the number of symbols in a slot. However, the number of symbols in a slot does not change with the change of the parameter set, and it only changes with the change of the slot configuration type, when the configuration is 0, the number of symbols in a slot is always 14, and when the configuration is 1, the number of symbols in a slot is 12. In particular, the amount of the solvent to be used,

when NR SCS =15khz, when NR slot =14 symbols =1ms

When NR SCS =30khz, then NR slot =14 symbols =0.5ms

When NR SCS =60khz, when NR slot =12 or 14 symbols (12 for extended CP,14 for normal CP) =0.25ms

When NR SCS =120khz, when NR slot =14 symbols =0.125ms

When NR SCS =240khz, when NR slot =14 symbols =0.0625ms

In addition, there are more slot types in 5G, respectively:

type 1: all downlink, DL-only slot,12/14 symbols each for downlink.

Type 2: full uplink, UL-only slot,12/14 symbols each for uplink.

Type 3: a fully Flexible resource, a Flexible-only slot, each symbol is Flexible and variable.

Type 4: at least one uplink or downlink symbol, and the rest flexible configuration, there are multiple configurations.

In addition, the 5G NR system supports a configuration scheme of four-level time slot ratio, and the specific configuration scheme adopted depends on the system requirement.

As described above, different Radio interface types, such as LTE (long term evolution, i.e. 4G Radio interface) or NR (Next Radio, i.e. 5G Radio interface), and different system configurations in the same communication network (e.g. whether parameter μ of 5G NR is 0 or other values) determine different Radio frame structures, and further affect the number of OFDM symbols in a Radio frame and the starting time and period of each OFDM symbol, so that parameters of the Radio frame structure need to be obtained according to a specific current network configuration to obtain related parameters of a specific OFDM symbol, such as: number of OFDM symbols, start time and period. The frame structure parameters of the radio frame include, but are not limited to: radio interface type, parameter set μ, CP type, etc.

In a specific example, a symbol counter (i.e. symbol number) of a radio frame and a symbol timer (i.e. symbol period and start or end time) of the radio frame where an OFDM symbol to be determined is located may be obtained according to a frame structure parameter of the radio frame based on a timing synchronization mechanism in a 4G/5G system, that is: the method comprises the steps that the symbol number and the specific starting or ending time point of an OFDM symbol to be judged in a wireless frame are judged, and then the specific time point of a symbol turn-off control signal corresponding to the OFDM symbol on a time axis is generated according to the judgment result of the OFDM symbol, the specific starting or ending time point and the symbol number. Then, at the time point when the turn-off control signal of each symbol starts, the power amplifier switch is controlled to be switched, if the OFDM symbol is a non-null symbol (traffic symbol), the turn-off control signal of the symbol is set to be in an on state (state 1), and if the symbol is a null symbol, the turn-off control signal of the symbol is set to be in an off state (state 0). Fig. 5 is a diagram of a correspondence relationship between OFDM symbols and corresponding symbol turn-off control signals in a radio frame according to a specific exemplary embodiment of the present invention, where a dotted line represents an OFDM symbol, and a solid line represents a symbol turn-off control signal corresponding to each OFDM symbol, as shown in the drawing, symbols with symbol numbers 0, 1, 3, and N are non-null symbols, and a state corresponding to the symbol turn-off control signal is an on state, that is: state 1; the symbol of the other symbol numbers is a null symbol, and the state corresponding to the symbol turn-off control signal is an off state, that is: state 0.

It should be noted that: the switching time point of each signal state in the symbol off control signal is a CP start time point of the next symbol.

Step S430: and performing time delay matching on the first symbol turn-off control signal to generate a second symbol turn-off control signal so as to align the second symbol turn-off control signal with the input signal input to the power amplification module after the OFDM symbol is subjected to signal processing.

The radio frequency unit symbol turn-off function controls the turn-off of the power amplifier on the time scale with the granularity of the symbol, so that the requirement on the time delay matching accuracy of the symbol turn-off signal and the service data processing signal is high. After the "first symbol turn-off control signal" is generated, it cannot be aligned with the input signal of the OFDM symbol input to the power amplifier module in time precisely (the "alignment" here is time alignment), so it is necessary to perform delay matching according to the time difference between the two signals, so that the two signals are aligned in time.

It should be noted that: the "alignment" here is not a perfect absolute alignment, i.e. no difference in time, as long as the alignment error does not affect the signal quality defined by the standard, the operational purpose of the alignment can be achieved.

In a specific example, the present invention performs delay matching on the first symbol off control signal through a buffer configured in advance based on a preset delay matching value. Specifically, a first-in first-out FIFO buffer may be selected, which is a time-delay-tunable FIFO buffer, and the time delay is controlled by controlling the write-in and read-out timings of the FIFO buffer. In one embodiment, the FIFO depth may be 32768, the delay accuracy 8.138ns (one 122.88MHz clock period), and the delay adjustment range 0-260 us. The theoretical configuration value of the preset delay matching value is the processing delay obtained by subtracting the symbol turn-off method step from the total processing delay (shown in fig. 2) of the downlink signal of the radio frequency unit (output from the ora interface to the power amplifier). When an actual system is implemented, an approximate range of a preset delay matching value can be determined through simple estimation, and then an accurate preset delay matching value is obtained through an actual measurement calibration method, wherein the calibration requirement is that the downlink signal quality is not influenced by the on or off of a symbol turn-off function, such as: EVM (Error Vector Magnitude) performance.

For the O-RU with multi-standard and multi-bandwidth types, the service processing delay may have a relationship with the air interface standard, the parameter set μ of NR, and the carrier bandwidth, so the FIFO buffer also needs to configure different preset delay matching values according to different scenarios.

In addition, for an ora radio unit supporting a multi-carrier system, when the same antenna has multiple different carriers, it is necessary to determine each symbol turn-off control signal of the OFDM symbol corresponding to each carrier first, and then perform logical combination on the symbol turn-off control signals corresponding to the multiple different carriers, where the logical combination operation may be performed in step S420 or in step S430. If the processing is performed in step S420, the first symbol turn-off control signal generated in step S420 is a symbol turn-off control signal obtained by logically combining symbol turn-off control signals corresponding to a plurality of different carriers. Specifically, when one of the symbol turn-off control signals corresponding to the plurality of different carriers is in an on state, the combined symbol turn-off control signal is in the on state; when the symbol turn-off control signals corresponding to a plurality of different carriers are in an off state at the same time, the combined symbol turn-off control signal is in an off state. If the step S430 is performed, the first symbol turn-off control signal refers to a symbol turn-off control signal generated according to a null symbol determination result of an OFDM symbol of each carrier, in the step S430, the first symbol turn-off control signal corresponding to each carrier is subjected to delay matching, then the first symbol turn-off control signals corresponding to a plurality of different carriers are subjected to logic combination, and the second symbol turn-off control signal generated according to the step S430 is a symbol turn-off control signal obtained by performing logic combination on the first symbol turn-off control signals corresponding to the plurality of different carriers. Specifically, when one of a plurality of first symbol off control signals corresponding to a plurality of different carriers is in an on state, the combined symbol off control signal is in an on state; when a plurality of first symbol turn-off control signals corresponding to a plurality of different carriers are in an off state at the same time, the combined symbol turn-off control signal is in an off state. Namely: if only one has service data on the carrier, the power amplifier module cannot be closed. It should be noted that: the symbol turn-off control signals of different carriers are logically combined, which means that the symbol turn-off control signals of different carriers at the same time are logically combined. For example, if one antenna has 3 carriers: a first carrier, a second carrier, and a third carrier, if: if the OFDM symbol of the first carrier at time t is a null symbol, the corresponding symbol turn-off control signal is in an off state, if the OFDM symbol of the second carrier at time t is a non-null symbol, the corresponding symbol turn-off control signal is in an on state, if the OFDM symbol of the third carrier at time t is a null symbol, the corresponding symbol turn-off control signal is in an off state, then: and when the symbol turn-off control signals of the three carriers at the time t are logically combined, the combined symbol turn-off control signals are in an on state, and finally the symbol turn-off control signals for controlling the power amplifier of the antenna access at the time t are in the on state, namely the power amplifier is not turned off at the time t.

Step S440: and controlling the power amplifier module to be switched off based on the second symbol switching-off control signal.

This step has different processing modes for the ORAN radio units supporting different modes. Specifically, when the ora radio frequency unit supports the FDD mode, the second symbol turn-off control signal is directly input to the power amplifier module, so that the power amplifier module is controlled to turn off; when the ORAN radio frequency unit is an ORAN radio frequency unit supporting a TDD mode, the ORAN radio frequency unit comprises a TDD switch controller, and a power amplifier switch signal output by the TDD switch controller is logically combined with the second symbol turn-off control signal to generate a third symbol turn-off control signal, and then the third symbol turn-off control signal is input to the power amplifier module, so that the third symbol turn-off control signal controls the turn-off of the power amplifier module. It should be noted that: and the logic combination of the power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal means that the signals of the power amplifier switch signal and the second symbol turn-off control signal at the same time are logically combined.

Specifically, when the power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal are logically combined, the combination logic is: when the power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal are in an on state at the same time, the third symbol turn-off control signal is in an on state, otherwise, the third symbol turn-off control signal is in an off state. Specifically, it can be interpreted as: when the sign off control signal is in an on state, namely: when the corresponding OFDM symbol contains service data, the O-RU is normally switched according to a static switch control mode, namely, the power amplifier is controlled by a power amplifier switch signal generated by a TDD switch controller; when the sign off control signal is in an off state, namely: when the corresponding OFDM symbol does not contain service data, the O-RU automatically turns off the power amplifier through the symbol turn-off control signal.

It can be known from the above steps that, in the embodiment of the present invention, the null symbol judgment is performed on the OFDM symbol by self-detection in the ORAN radio frequency unit O-RU itself, and then the symbol turn-off control signal is generated according to the judgment result to control the power amplifier to turn off the symbol, so that the symbol turn-off of the ORAN radio frequency unit does not need the support of the ORAN interface protocol, does not depend on the real-time control message of the O-DU, and does not need the control and participation of the O-DU, thereby realizing the function decoupling of the O-DU and the O-RU on the symbol turn-off, solving the power consumption problem of the ORAN network radio frequency unit, saving the power consumption, and simultaneously enabling the O-RU devices and the O-DU devices among different manufacturers to support the symbol turn-off function when they are interconnected, and embodying the spirit of the openness and compatibility of the ORAN protocol.

Fig. 6 is a schematic structural diagram of a symbol turn-off device according to an embodiment of the present invention, and is disposed in an ORAN radio frequency unit, where the ORAN radio frequency unit includes a power amplifier module, and as shown in fig. 6, the symbol turn-off device 6 according to an embodiment of the present invention includes: a null symbol detector 610 configured to determine whether the received OFDM symbol is a null symbol, resulting in a determination result; a symbol turn-off control signal generator 620 configured to generate a first symbol turn-off control signal according to the frame structure parameter of the radio frame in which the OFDM symbol is located and the determination result; a delay matcher 630, configured to perform delay matching on the first symbol turn-off control signal, and generate a second symbol turn-off control signal, so that the second symbol turn-off control signal is aligned with an input signal, which is input to the power amplifier module after the OFDM symbol is signal-processed; a power amplifier turn-off control module 640 configured to control turn-off of the power amplifier module based on the second symbol turn-off control signal.

Fig. 7 is a schematic structural diagram of an O-RU according to an embodiment of the present invention, and as shown in fig. 7, the O-RU according to the embodiment of the present invention is an ora radio unit supporting an FDD mode, and at least includes: the sign switch-off means 6 as described in the above embodiments are provided.

Fig. 8 is a schematic structural diagram of another O-RU according to an embodiment of the present invention, and as shown in fig. 8, the O-RU according to the embodiment of the present invention is an ora radio unit supporting a TDD mode, and at least includes: the sign switch-off means 6 as described in the above embodiments are provided.

Fig. 9 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention. As shown in fig. 9, the electronic apparatus includes: a memory 910 and a processor 920, wherein the memory 910 and the processor 920 are in communication; illustratively, the memory 910 and the processor 920 are in communication via a communication bus 930, the memory 910 is used for storing computer programs, and the processor 920 executes the computer programs to implement the symbol turn-off method shown in the above embodiments.

Optionally, the electronic device may further comprise a transmitter and/or a receiver.

Alternatively, the Processor may be a Central Processing Unit (CPU), or may be implemented by other general-purpose processors, a PLC (Programmable Logic Controller), an FPGA (Field-Programmable Gate Array), a DSP (Digital Signal Processor), or an ASIC (Application Specific Integrated Circuit). A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.

An embodiment of the present invention provides a storage medium, where the storage medium is used to store a computer program, and the computer program is used to implement the symbol turn-off method described in any of the above method embodiments.

The embodiment of the present invention provides a chip, where the chip is used to support a receiving device (for example, a terminal device, a network device, and the like) to implement the functions shown in the embodiment of the present invention, and the chip is specifically used in a chip system, where the chip system may be formed by a chip, and may also include a chip and other discrete devices. When the chip in the receiving device implementing the method includes a processing unit, the chip may further include a communication unit, and when the chip includes a communication unit, the communication unit may be, for example, an input/output interface, a pin, a circuit, or the like. The processing unit executes all or part of the actions executed by each processing module in the embodiment of the invention, and the communication unit can execute corresponding receiving or sending actions. In another specific embodiment, the processing module of the receiving device in the embodiment of the present invention may be a processing unit of a chip, and the receiving module or the sending module of the control device is a communication unit of the chip.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus (device) or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may employ a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations of methods, apparatus (devices) and computer program products according to embodiments of the application. It will be understood that each flow in the flow diagrams can be implemented by computer program instructions.

These computer program instructions may be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows.

These computer program instructions may also be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows.

Another embodiment of the invention is directed to a non-transitory storage medium storing a computer-readable program for causing a computer to perform some or all of the above-described method embodiments.

That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be accomplished by specifying, by a program, relevant hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A symbol turn-off method is applied to an ORAN radio frequency unit, wherein the ORAN radio frequency unit comprises a power amplifier module, and the method comprises the following steps:

performing delay matching on the first symbol turn-off control signal to generate a second symbol turn-off control signal, so that the second symbol turn-off control signal is aligned with an input signal input to the power amplification module after the OFDM symbol is subjected to signal processing;

and controlling the power amplifier module to be turned off based on the second symbol turn-off control signal.

2. The method of claim 1, wherein the determining whether the received OFDM symbol is a null symbol comprises:

3. The method according to claim 1, wherein the generating a first symbol turn-off control signal according to the frame structure parameter of the radio frame in which the OFDM symbol is located and the determination result specifically includes:

generating the first symbol off control signal according to the judgment result, the symbol counter and the symbol timer, wherein the state of the first symbol off control signal comprises: an on state and an off state.

4. The method according to claim 1, wherein the performing delay matching on the first symbol turn-off control signal specifically includes:

5. The method according to claim 1, wherein the controlling the power amplifier module to be turned off based on the second symbol turn-off control signal specifically includes:

when the ORAN radio frequency unit supports a TDD mode, the ORAN radio frequency unit comprises a TDD switch controller, a power amplifier switch signal output by the TDD switch controller and the second symbol turn-off control signal are logically combined to generate a third symbol turn-off control signal, and then the third symbol turn-off control signal is input to the power amplifier module so that the third symbol turn-off control signal controls the turn-off of the power amplifier module.

6. The method according to claim 5, wherein the logically combining the power amplifier switch signal output by the TDD switch controller with the second symbol off control signal includes:

7. The method according to any of claims 1-6, wherein when the ORAN RF unit comprises a pre-coding function module or a beam-forming function module, the OFDM symbol is the OFDM symbol after being processed by the pre-coding function module or the beam-forming function module.

8. A symbol turn-off device is arranged in an ORAN radio frequency unit, wherein the ORAN radio frequency unit comprises a power amplifier module, and the symbol turn-off device is characterized by comprising:

9. An O-RU, comprising at least: symbol turn-off device as claimed in claim 8.

10. An electronic device comprising a memory and a processor, the memory configured to store one or more computer program instructions, wherein the one or more computer program instructions are executed by the processor to implement the method of any one of claims 1-7.

11. A storage medium for storing a computer program for implementing the method of any one of claims 1 to 7.