Radio remote unit, combiner / splitter unit, communication device and communication system

Abstract

The invention provides a remote radio unit, a combiner and splitter unit, a communication device and a communication system, relates to the field of communication technology, and solves the problem that the use of an old and traditional indoor distribution system is limited in the prior art. The radio remote unit comprises at least one frequency division duplex (FDD) receiving port; the at least one time division duplex (TDD) frequency shift port is used for transmitting a radio frequency signal and a local oscillator signal; wherein the transmission frequency band corresponding to the FDD receiving port is different from the transmission frequency band corresponding to the TDD frequency shift port, and the transmission frequency band corresponding to the TDD frequency shift port is equal to the sum of the frequency band of a radio frequency signal transmitted by the TDD frequency shift port and the frequency band of a local oscillator signal.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a radio frequency remote unit, a combining and splitting unit, a communication device and a communication system. Background Art

[0002] With the development of diversified 5G communication services, typical 5G communication services have put forward higher requirements on the existing network from the perspectives of high speed, high flexibility, multiple connections, low latency, high reliability and network openness. When users move from outdoor to indoor, the network of the user terminal needs to switch from 5G network to 4G network, and the network will become unstable during the switching process.

[0003] Reusing the existing network system means that when building a new communication system, the infrastructure and equipment of the existing network are fully utilized for deployment. The system that reuses the existing network can effectively utilize the existing infrastructure and equipment, reduce the demand for new infrastructure and equipment, and thus save costs. In the case of reusing the traditional indoor distributed system, the existing technology usually deploys the existing 4G long term evolution (LTE) network and the 5G new radio (NR) network on a common cable. However, the above-mentioned traditional indoor distributed system supports a limited range of frequency bands and cannot support the channel transmission of 5G NR, thus limiting its use. Summary of the invention

[0004] The embodiments of the present application provide a radio frequency remote unit, a combining and splitting unit, a communication device and a communication system, which solve the problem of limited use of traditional indoor distributed systems in the prior art.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a radio frequency remote unit is provided, which includes at least one frequency division duplex (FDD) receiving port, for example, which can be used to receive radio frequency signals in the frequency band of a 4G communication system; and at least one time division duplex (TDD) frequency shifting port, which is used to transmit radio frequency signals and local oscillator signals; wherein the transmission frequency band corresponding to the FDD receiving port is different from the transmission frequency band corresponding to the TDD frequency shifting port, and the transmission frequency band corresponding to the TDD frequency shifting port is equal to the sum of the frequency band of the radio frequency signal transmitted by the TDD frequency shifting port and the frequency band of the local oscillator signal, that is, the TDD frequency shifting port can be used to receive or send signals in the above-mentioned transmission frequency band in a frequency shifting manner, and the frequency shifting may refer to frequency shifting a signal in a higher transmission frequency band to a radio frequency signal and a local oscillator signal in a lower frequency band, or frequency shifting a radio frequency signal and a local oscillator signal in a lower frequency band to a signal in a higher transmission frequency band, for example, for transmitting radio frequency signals in the frequency band of a 5G communication system in a frequency shifting manner.

[0007] In the above scheme, the radio frequency remote unit includes at least one FDD receiving port and at least one TDD frequency shifting port, the at least one FDD receiving port can be used to receive signals in the frequency band of the 4G communication system, and the at least one TDD frequency shifting port can be used to receive or send signals in the frequency band of the 5G communication system in a frequency shifting manner. In this way, the radio frequency remote unit can be used to transmit signals in the transmission frequency bands corresponding to different communication systems at the same time, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system, thereby realizing the evolution of the large-bandwidth co-cable deployment of the indoor distributed 4G LTE communication system and the 5G NR communication system, and meeting the needs of maximizing the transmission of network traffic.

[0008] In combination with the first aspect, in a possible implementation, the transmission frequency band corresponding to the at least one FDD receiving port is the frequency band of the 4G communication system, and the transmission frequency band corresponding to the at least one TDD frequency shift port is the frequency band of the 5G communication system. In the above possible implementation, the radio frequency remote unit can be used to transmit signals of transmission frequency bands corresponding to different communication systems at the same time, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system, thereby realizing the large-bandwidth co-cable deployment evolution of the indoor distributed 4G LTE system and the 5G NR system, and meeting the needs of maximizing the transmission of network traffic.

[0009] In combination with the first aspect, the at least one FDD receiving port includes a first FDD receiving port, and the transmission frequency band corresponding to the first FDD receiving port is a first frequency band. In the above possible implementation, the radio frequency remote unit can receive the radio frequency signal of the first frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the first FDD receiving port without receiving it through the radio frequency unit corresponding to the FDD system, thereby realizing the separation of reception and transmission of the FDD system, thereby realizing lossless transmission of the FDD system.

[0010] In combination with the first aspect, in a possible implementation, the at least one FDD receiving port also includes a second FDD receiving port, the transmission frequency band corresponding to the second FDD receiving port is a second frequency band, and the first frequency band is different from the second frequency band. In the above possible implementation, the radio frequency remote unit can receive the radio frequency signal of the second frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the second FDD receiving port without receiving it through the radio frequency unit corresponding to the FDD system, thereby realizing the separation of reception and transmission of the FDD system, thereby realizing lossless transmission of the FDD system.

[0011] In combination with the first aspect, in a possible implementation, the at least one TDD frequency shift port includes a first TDD frequency shift port, and the transmission frequency band corresponding to the first TDD frequency shift port is a third frequency band. In the above possible implementation, the at least one TDD frequency shift port includes a first TDD frequency shift port, and the first TDD frequency shift port can be used to transmit the signal of the third frequency band of the TDD system (for example, 5G NR system) in a frequency shifting manner, so that the radio frequency remote unit can be used to transmit the signal corresponding to the communication system of the higher transmission frequency band, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system.

[0012] In combination with the first aspect, in a possible implementation, the at least one TDD frequency shift port also includes a second TDD frequency shift port, the transmission frequency band corresponding to the second TDD frequency shift port is a fourth frequency band, and the third frequency band is different from the fourth frequency band. In the above possible implementation, the at least one TDD frequency shift port also includes a second TDD frequency shift port, and the second TDD frequency shift port can be used to transmit the signal of the fourth frequency band of the TDD system (for example, 5G NR system) in a frequency shifting manner, so that the radio frequency remote unit can be used to transmit the signal corresponding to the communication system with a higher transmission frequency band, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system.

[0013] In a second aspect, a combining and splitting unit is provided, which includes at least one frequency division duplex (FDD) transmitting port, for example, which can be used to send radio frequency signals in the frequency band of a 4G communication system; the at least one frequency division duplex (FDD) receiving port, for example, which can be used to receive radio frequency signals in the frequency band of a 4G communication system; the at least one time division duplex (TDD) frequency shifting port, which is used to transmit radio frequency signals and local oscillator signals; wherein the transmission frequency band corresponding to the FDD transmitting port and the FDD receiving port is different from the transmission frequency band corresponding to the TDD frequency shifting port, and the transmission frequency band corresponding to the TDD frequency shifting port is equal to the sum of the frequency band of the radio frequency signal and the frequency band of the local oscillator signal transmitted by the TDD frequency shifting port, that is, the TDD frequency shifting port can be used to receive or send signals in the above-mentioned transmission frequency band in a frequency shifting manner, and the frequency shifting may refer to frequency shifting the signal of a higher transmission frequency band to a radio frequency signal and a local oscillator signal of a lower frequency band, or frequency shifting the radio frequency signal and the local oscillator signal of a lower frequency band to a signal of a higher transmission frequency band, for example, for transmitting radio frequency signals in the frequency band of a 5G communication system in a frequency shifting manner.

[0014] In the above possible implementations, the at least one FDD transmission port and at least one FDD receiving port included in the combining and splitting unit can be used to send and receive signals in the 4G communication system frequency band respectively, and at least one TDD frequency shift port can be used to receive or send signals in the 5G communication system frequency band in a frequency shifting manner. In this way, the combining and splitting unit can be used to transmit signals in the transmission frequency bands corresponding to different communication systems at the same time, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system, thereby realizing the large-bandwidth co-cable deployment evolution of the indoor distributed 4G LTE system and the 5G NR system, and meeting the needs of maximizing the transmission of network traffic.

[0015] In combination with the second aspect, in a possible implementation, the at least one FDD transmitting port includes a first FDD transmitting port, and the transmission frequency band corresponding to the first FDD transmitting port is a first frequency band; the at least one FDD receiving port includes a first FDD receiving port, and the transmission frequency band corresponding to the first FDD receiving port is a second frequency band. In the above possible implementation, the combining and splitting unit can receive the radio frequency signal of the first frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the first FDD receiving port, and send the radio frequency signal of the second frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the first FDD receiving port, that is, the combining and splitting unit simultaneously receives and sends signals of different frequency bands corresponding to the FDD system, thereby realizing the separation of reception and transmission of the same frequency band of the FDD system, thereby realizing lossless transmission of the FDD system.

[0016] In combination with the second aspect, in a possible implementation, the at least one FDD transmitting port also includes a second FDD transmitting port, and the transmission frequency band corresponding to the second FDD transmitting port is the third frequency band; the at least one FDD receiving port also includes a second FDD receiving port, and the transmission frequency band corresponding to the second FDD receiving port is the fourth frequency band, and the third frequency band is different from the fourth frequency band. In the above possible implementation, the combining and splitting unit can receive the radio frequency signal of the second frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the second FDD receiving port, and send the radio frequency signal of the first frequency band corresponding to the FDD system (for example, 4G LTE communication system) through the second FDD receiving port, that is, the combining and splitting unit simultaneously receives and sends signals of different frequency bands corresponding to the FDD system, thereby realizing the separation of reception and transmission of the same frequency band of the FDD system, thereby realizing lossless transmission of the FDD system.

[0017] In combination with the second aspect, in a possible implementation, the at least one TDD frequency shift port includes a first TDD frequency shift port, and the transmission frequency band corresponding to the first TDD frequency shift port is the fifth frequency band. In the above possible implementation, the at least one TDD frequency shift port includes a first TDD frequency shift port, and the first TDD frequency shift port can be used to transmit the signal of the third frequency band of the TDD system (for example, 5G NR system) in a frequency shifting manner, so that the radio frequency remote unit can be used to transmit the signal corresponding to the communication system of the higher transmission frequency band, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system.

[0018] In combination with the second aspect, in a possible implementation, the at least one TDD frequency shift port also includes a second TDD frequency shift port, and the transmission frequency band corresponding to the second TDD frequency shift port is the sixth frequency band, and the fifth frequency band is different from the sixth frequency band. In the above possible implementation, the at least one TDD frequency shift port also includes a second TDD frequency shift port, and the second TDD frequency shift port can be used to transmit the signal of the fourth frequency band of the TDD system (for example, 5G NR system) in a frequency shifting manner, so that the radio frequency remote unit can be used to transmit the signal corresponding to the communication system with a higher transmission frequency band, and when applied to the reuse of the traditional indoor distributed system, it is not affected by the frequency band supported by the reuse of the traditional indoor distributed system.

[0019] According to a third aspect, a communication device is provided. The communication device includes a first radio remote unit and a second radio remote unit. The second radio remote unit is a radio remote unit provided by the first aspect or any possible implementation of the first aspect.

[0020] In combination with the third aspect, in a possible implementation manner, the communication device also includes the combining and splitting unit provided by the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0021] In a fourth aspect, a communication system is provided, including a baseband unit, a first radio frequency remote unit, a second radio frequency remote unit, a combiner / splitter unit, a distributed antenna system and a mixing antenna, the second radio frequency remote unit being the radio frequency remote unit provided by the first aspect or any possible implementation of the first aspect, and the combiner / splitter unit being the combiner / splitter unit provided by the second aspect or any possible implementation of the second aspect.

[0022] It can be understood that the beneficial effects that can be achieved by any of the communication devices and communication systems provided above can correspond to the beneficial effects in the radio frequency remote unit and the combining and splitting unit provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a communication system;

[0024] Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0030] Figure 8 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0031] Fig. 9 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0032] Fig.10 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0033] Fig.11 A schematic diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. In the present application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0035] The embodiments of the present application use words such as "first" and "second" to distinguish objects with similar names, functions or effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity and execution order. The term "coupled" is used to indicate electrical connection, including direct connection through wires or connection terminals or indirect connection through other devices. Therefore, "coupled" should be regarded as a broad electronic communication connection.

[0036] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0037] Before introducing the embodiments of the present application, the application scenarios involved in the present application are first introduced and explained.

[0038] With the development of diversified 5G communication services, typical 5G communication services have put forward higher requirements on the existing network from the perspectives of high speed, high flexibility, multiple connections, low latency, high reliability and network openness. When users move from outdoor to indoor, the network of the user terminal needs to switch from 5G network to 4G network, and the network will become unstable during the switching process.

[0039] Reusing the existing network system means that when building a new communication system, the infrastructure and equipment of the existing network are fully utilized for deployment. Reusing the existing network system can effectively utilize the existing infrastructure and equipment, reduce the demand for new infrastructure and equipment, and thus save costs. The existing technology deploys the existing 4G long-term evolution (LTE) network and the 5G new radio (NR) network on the same cable while reusing the traditional indoor distributed system.

[0040] In one implementation, the frequency division duplex (FDD) 4G LTE (1.8G / 2.1G frequency band) module and the time division duplexing (TDD) 5G NR (3.5G frequency band) module are combined through a combining unit (point of interface, POI) and fed into a single-channel distributed antenna system (DAS) system. The DAS system transmits the signal to the indoor antenna, and the indoor antenna processes the signal, thereby realizing the co-cable deployment of FDD 4G LTE and TDD 5G NR, providing users with a stable network environment indoors.

[0041] For example, Figure 1 It is a structural schematic diagram of a communication system. The communication system may include a room-based signal source, a multi-system access point (POI) combiner, a DAS system and a room-based antenna. Among them, the room-based signal source may include a baseband unit (BBU), a 4G radio remote unit (RRU) and a 5G RRU, the first output end of the BBU is coupled with the input end of the 4G RRU, and the second output end of the BBU is coupled with the first input end of the 5G RRU. The transmission end of the 4G RRU is coupled with the first transmission end of the POI combiner, and the transmission end of the 5G RRU is coupled with the second transmission end of the POI combiner. The third transmission end of the POI combiner is coupled with the first transmission end of the DAS system, and the second transmission end of the DAS system is coupled with the transmission end of the room-based antenna. Figure 1 The indoor antenna includes channel 1 and channel 2. Channel 1 is used to transmit 1.8G or 2.1G radio frequency signal RF1, and channel 2 is used to transmit 3.5G radio frequency signal RF2.

[0042] Among them, the 4G RRU can be used to receive and send RF signals in the 1.8G frequency band or the RF signals in the 2.1G frequency band in the form of FDD, and the 5G RRU can be used to receive and send RF signals in the 3.5G frequency band in the form of TDD.

[0043] Optionally, the DAS system may include a power divider and at least one coupler, the first transmission end of the power divider is coupled to the third transmission end of the POI combiner, the second transmission end of the power divider is coupled to the input end of the coupler, the output end of the coupler is coupled to the transmission end of the room antenna, and the coupling end of the coupler can be coupled to the input end of another coupler.

[0044] Specifically, the BBU can output the first baseband signal and the second baseband signal through the optical fiber module, and input the first baseband signal and the second baseband signal into the 4G RRU and the 5G RRU respectively. The 4G RRU and the 5G RRU can output RF signals of corresponding frequency bands according to their received baseband signals respectively, and the POI combiner can combine the two RF signals, and transmit the combined RF signal to the indoor antenna through the DAS system, and the indoor antenna sends the RF signal out.

[0045] In the above technical solution, the DAS system only supports transmission in the 700MHz-2.6GHz frequency band. The transmission frequency band of TDD 5G NR is 3.5G, which makes it difficult to meet the transmission needs of large bandwidth. In addition, the existing single-channel DAS system can only meet the single-stream transmission of TDD 5G NR network traffic, and cannot maximize the traffic. It is difficult to meet the needs of 5G network high-traffic transmission indoors.

[0046] Based on this, the embodiment of the present application provides a communication system that can be used to make full use of the DAS system to realize frequency band signal transmission of different communication systems. The technical solution provided in the embodiment of the present application can be applied to various communication systems based on indoor distributed systems for signal transmission. For example, the different communication systems may include 2G, 3G, 4G, 5G and any communication system that may appear in the future. The communication system provided by the present application is introduced and explained below.

[0047] Figure 2 1 is a schematic diagram of the structure of a communication system provided by an embodiment of the present application. The communication system may include a baseband unit, a first radio remote unit (RRU), a second RRU, a combiner / splitter unit, a distributed antenna system, and a frequency mixing antenna. The baseband unit may be coupled to the first RRU and the second RRU through an optical fiber and an optical module, the first RRU and the second RRU are also coupled to the combiner / splitter unit, the combiner / splitter unit is coupled to the DAS system, and the DAS system is also used to couple with the frequency mixing antenna.

[0048] The baseband unit may be used to send baseband signals to the first RRU and the second RRU, or receive baseband signals sent by the first RRU and the second RRU; the baseband unit may also process the baseband signals.

[0049] In a possible embodiment, the first RRU includes at least one FDD transceiver port. Optionally, at least one FDD transceiver port can be used as at least one FDD transmit port, that is, the first RRU can be used to send radio frequency signals corresponding to the FDD system. For example, the first RRU supports the transmission of 1T1R 4G LTE services, and can be specifically used only to implement the transmission of 4G LTE downlink services. Optionally, the above-mentioned at least one FDD transceiver port can also be at least one FDD transmit port, that is, the first RRU includes at least one FDD transmit port.

[0050] Among them, the at least one FDD transceiver port includes one or more FDD transceiver ports. For example, the at least one FDD transceiver port includes a first FDD transceiver port, or includes a first FDD transceiver port and a second FDD transceiver port. The transmission frequency bands corresponding to the first FDD transceiver port and the second FDD transceiver port may be the same or different. In one example, the transmission frequency bands corresponding to the first FDD transceiver port and the second FDD transceiver port are different, the transmission frequency band corresponding to the first FDD transceiver port is a first frequency band, the transmission frequency band corresponding to the second FDD transceiver port is a second frequency band, and the first frequency band is different from the second frequency band.

[0051] Optionally, the first RRU may be an RRU corresponding to an FDD system (or referred to as an FDD RRU), for example, the first RRU is an RRU corresponding to a 4G FDD LTE system, and the transmission frequency band corresponding to the first RRU may be a transmission frequency band corresponding to the 4G FDD LTE system, and the transmission frequency band may be 1.8G or 2.1G.

[0052] Further, such as Figure 3 As shown, the first RRU may also include one or more of a digital processing unit, a power supply and clock circuit, a radio frequency transceiver link, a power amplifier, a control circuit, a receiving amplifier, and a filter. The digital processing unit may be used to process baseband signals; the power supply and clock circuit may be used to provide power and synchronization signals to the first RRU; the radio frequency transceiver link may be used to transmit data; the power amplifier may be used to enhance the strength of the transmitted signal; the control circuit may be used to control the operation of the first RRU; the receiving amplifier may be used to amplify the received radio frequency signal; and the filter may be used to eliminate unnecessary signal components. Figure 3 In the description, an example is given in which the first RRU includes two FDD sending ports.

[0053] In a possible embodiment, the second RRU includes at least one FDD receiving port and at least one TDD frequency shifting port. That is, the second RRU can be used to receive radio frequency signals corresponding to the FDD system, and to receive or send radio frequency signals corresponding to the TDD system. For example, the second RRU supports the transmission of nTnR TDD 5G NR services and xR FDD LTE uplink services, where n and x are integers greater than or equal to 1.

[0054] Among them, the at least one FDD receiving port may include one or more FDD receiving ports, for example, the at least one FDD receiving port includes a first FDD receiving port, or includes a first FDD receiving port and a second FDD receiving port. The transmission frequency bands corresponding to the first FDD receiving port and the second FDD receiving port may be the same or different. In one example, the transmission frequency bands corresponding to the first FDD receiving port and the second FDD receiving port are different, the transmission frequency band corresponding to the first FDD receiving port is the first frequency band, the transmission frequency band corresponding to the second FDD receiving port is the second frequency band, and the first frequency band is different from the second frequency band. Optionally, the at least one FDD receiving port may be a receiving port corresponding to an FDD system, for example, a receiving port corresponding to a 4G FDDLTE system, for receiving radio frequency signals with a transmission frequency band of 1.8G or 2.1G.

[0055] In addition, the at least one TDD frequency shift port can be used to transmit radio frequency signals and local oscillator signals. The at least one TDD frequency shift port may include one or more TDD frequency shift ports, for example, the at least one TDD frequency shift port includes a first TDD frequency shift port, or includes a first TDD frequency shift port and a second TDD frequency shift port. Among them, the transmission frequency bands corresponding to the first TDD frequency shift port and the second TDD frequency shift port may be the same or different. In one example, the transmission frequency bands corresponding to the first TDD frequency shift port and the second TDD frequency shift port are different, the transmission frequency band corresponding to the first TDD frequency shift port is the third frequency band, the transmission frequency band corresponding to the second TDD frequency shift port is the fourth frequency band, and the third frequency band is different from the fourth frequency band.

[0056] The above-mentioned TDD frequency shift port can be used to transmit signals in a frequency shifting manner, and the frequency shifting may refer to shifting the signal of a higher transmission frequency band to a radio frequency signal and a local oscillator signal of a lower frequency band, or shifting the radio frequency signal and the local oscillator signal of a lower frequency band to a signal of a higher transmission frequency band, for example, for transmitting the radio frequency signal of the frequency band of a 5G communication system in a frequency shifting manner.

[0057] Optionally, the second RRU may be an RRU corresponding to a TDD system (or referred to as a frequency-shifting RRU). For example, the second RRU may be an RRU corresponding to a 5G TDD NR system, and the transmission frequency band corresponding to the second RRU may be a transmission frequency band corresponding to a 5G TDD NR system. In the second RRU, the transmission frequency band corresponding to the FDD receiving port is different from the transmission frequency band corresponding to the TDD frequency-shifting port, and the transmission frequency band corresponding to the TDD frequency-shifting port is equal to the sum of the frequency band of the radio frequency signal transmitted by the TDD frequency-shifting port and the frequency band of the local oscillator signal. Exemplarily, the transmission frequency band corresponding to the TDD frequency-shifting port may be a 3.5G radio frequency signal, wherein the at least one TDD frequency-shifting port may specifically use a frequency-shifting frequency band below 2.6G (non-standard 3GPP frequency band).

[0058] Optionally, the first RRU and the second RRU can be designed in the same frame as the BBU to realize the transmission and reception of multi-band and multi-standard base station communication RF signals. In addition, the second RRU can be in the form of an nTmR port (T represents transmission and R represents reception), for example, to support nTnR TDD 5G NR services and xR FDD LTE uplink services, where n, m, and x can be greater than or equal to 1.

[0059] Further, such as Figure 3 As shown, the second RRU may also include one or more of a digital processing unit, a power supply and clock circuit, a local oscillator transmission link, a frequency conversion radio frequency transceiver link, a power amplifier, a control circuit, a receiving amplifier, and a filter. Among them, the digital processing unit can be used to process the baseband signal; the power supply and clock circuit can be used to provide power and synchronization for the second RRU; the local oscillator transmission link can be used to send a local oscillator signal with a stable frequency; the frequency conversion radio frequency transceiver link can be used to up-convert the baseband signal and the local oscillator signal into a radio frequency signal, or down-convert the radio frequency signal into a baseband signal and a local oscillator signal; the power amplifier can be used to enhance the strength of the transmission signal; the control circuit can be used to control the operation of the second RRU; the receiving amplifier can be used to amplify the received radio frequency signal; and the filter can eliminate unnecessary signal components. Figure 3 The second RRU includes two FDD receiving ports and two TDD frequency shifting ports as an example for explanation. Figure 3 The communication system shown can also be called a schematic diagram of 2T2R 4G LTE + 2T2R 5G NR co-cable transmission networking.

[0060] In a possible embodiment, the combining and splitting unit includes at least one FDD transmitting port and at least one FDD receiving port (i.e., the FDD transmitting and receiving ports are separately arranged), and at least one TDD frequency shifting port. Among them, the at least one FDD transmitting port can be used to be connected to the at least one FDD transmitting and receiving port of the first RRU in a one-to-one correspondence. The at least one FDD receiving port can be used to be connected to the at least one FDD receiving port of the second RRU in a one-to-one correspondence. The at least one TDD frequency shifting port can be used to be connected to the at least one TDD frequency shifting port of the second RRU in a one-to-one correspondence. The combining and splitting unit can be used to combine the signals sent by the first RRU and the second RRU into one signal and then transmit it through the DAS system and the antenna, and can also be used to split the signal transmitted by the antenna and the DAS system into two corresponding signals, and transmit them to the first RRU and the second RRU. Figure 3 In the description, the example in which the combining and splitting unit includes two FDD transmitting ports, two FDD receiving ports and two TDD frequency shifting ports is taken.

[0061] In a possible embodiment, the DAS system may include a power divider and at least one coupler, the first transmission end of the power divider is coupled to the third transmission end of the combiner / splitter unit, the second transmission end of the power divider is coupled to the input end of the coupler, the output end of the coupler is coupled to the transmission end of the room antenna, and the coupling end of the coupler can be coupled to the input end of another coupler.

[0062] In a possible embodiment, the hybrid antenna may include an FDD antenna and a TDD antenna, and the TDD antenna may include a multiple-input multiple-output MIMO antenna. The FDD antenna may be used to receive and send signals corresponding to FDD, and the TDD antenna may be used to receive or send signals corresponding to TDD.

[0063] In the following, the first RRU includes two FDD transceiver ports, and the second RRU includes two FDD receive ports and two TDD frequency shift ports. Figure 4 The specific structures of the first RRU, the second RRU and the combining and splitting unit in the communication system are illustrated by way of example.

[0064] exist Figure 4In the embodiment, the first RRU includes a first FDD transceiver port (denoted as FDD TRX port 1) and a second FDD transceiver port (denoted as FDD TRX port 2), and the corresponding supported frequency bands are RF1 / RF3 and RF2 / RF4. The second RRU includes a first FDD receive port (denoted as FDD RX port 1) and a second FDD receive port (denoted as FDD RX port 2), as well as a first TDD frequency shift port (denoted as TDD frequency shift port 1) and a second TDD frequency shift port (denoted as TDD frequency shift port 2), and the corresponding supported frequency bands are RF3, RF4, RF5+LO1, and RF6+LO2. The combining and splitting unit includes a first FDD transmitting port (expressed as FDD TX port 1), a second FDD transmitting port (expressed as FDD TX port 2), a first FDD receiving port (expressed as FDD RX port 1), a second FDD receiving port (expressed as FDD RX port 2), and a first TDD frequency shifting port (expressed as TDD frequency shifting port 1) and a second TDD frequency shifting port (expressed as TDD frequency shifting port 2), and the corresponding supported frequency bands are RF1, RF2, RF3, RF4, RF5+LO1, and RF6+LO2. The above RF1, RF2, RF3, RF4, RF5, RF6, LO1, and LO2 represent different frequency bands or signals of different frequency bands.

[0065] In one example, when the first RRU is an RRU of a 4G LTE system (for example, the supported frequency bands include 1.8G and 2.1G), and the second RRU is an RRU of a 5G NR system (for example, the supported frequency bands include 3.5G), the frequency band ranges of RF1 and FR3 may be two different frequency bands corresponding to 1.8G, the frequency band ranges of RF2 and RF4 may be two different frequency bands corresponding to 2.1G, and RF5+LO1=RF6+LO2 and the corresponding frequency band range may be the frequency band corresponding to 3.5G. Among them, RF5 and RF6 may be different, and LO1 and LO2 may also be different.

[0066] Figure 4 In the figure, the connection between the FDD TRX port 1 of the first RRU and the FDD TX port 1 of the combining and splitting unit is represented as ①, and the connection between the FDD TRX port 2 and the FDD TX port 2 of the combining and splitting unit is represented as ②; the connection between the FDD TRX port 1 of the second RRU and the FDD RX port 1 of the combining and splitting unit is represented as ③, the connection between the FDD RX port 2 and the FDD RX port 2 of the combining and splitting unit is represented as ④, the connection between the TDD frequency shift port 1 and the TDD frequency shift port 1 of the combining and splitting unit is represented as ⑤, and the connection between the TDD frequency shift port 2 and the TDD frequency shift port 2 of the combining and splitting unit is represented as ⑥.

[0067] It is understandable that the above Figure 4 The example in which the first RRU, the second RRU and the combining and splitting unit include ports of different frequency bands is used for explanation. In actual applications, the first RRU, the second RRU and any one of the combining and splitting units may also include multiple ports corresponding to the same frequency band. For example, the first RRU may include two ports corresponding to RF1 / RF3, or include two ports corresponding to RF2 / RF4, etc. The embodiments of the present application do not impose specific restrictions on this.

[0068] Based on this, the first RRU, the second RRU and the combining and splitting unit in the communication system can be used to transmit the signals of the 1.8G band, the 2.1G band of the 4G LTE system and the 3.5G band of the two-way 5G NR system, so that the DAS system can realize the dual-stream co-cable deployment of the 4G LTE system and the 5G NR system, and the downlink traffic is greatly improved. In addition, when the second RRU is the RRU corresponding to the 5G NR system, the frequency band below 2.6G (non-standard 3GPP band) is used to achieve 5G NR coverage while maximizing the use of the existing DAS system (no new station is required). The second RRU also has a multi-band multi-standard passive intermodulation (PIM) interference cancellation function, which can automatically complete the interference cancellation compensation caused by the poor PIM index of the DAS system, and realize 4G LTE lossless uplink service transmission. Among them, when the PIM correction capability of the second RRU is high, the lossless co-cable deployment of single-frequency 4G LTE single-stream and 5G NR dual-stream in the room can be achieved.

[0069] For ease of understanding, the structure of the communication device is illustrated below by taking the first RRU being an RRU of a 4G LTE system and the second RRU being an RRU of a 5G NR system as an example.

[0070] In one example, if Figure 5 As shown, the first RRU includes an FDD TRX port 1 and an FDD TRX port 2 supporting frequency bands RF1 / RF3; the second RRU includes an FDD RX port 1 supporting frequency band RF3, a TDD frequency shift port 1 supporting frequency band RF5+LO1, and a TDD frequency shift port 2 supporting frequency band RF6+LO2; the combining and splitting unit includes an FDD TX port 1 supporting frequency band RF1, an FDD TX port 2 supporting frequency band RF2, an FDD RX port 1 supporting frequency band RF3, an FDD RX port 2 supporting frequency band RF4, a TDD frequency shift port 1 supporting frequency band RF5+LO1, and a TDD frequency shift port 2 supporting frequency band RF6+LO2. Figure 5 The communication system shown can also be called a 1T1RLTE+2T2R NR co-cable transmission networking communication system.

[0071] Specifically, the FDD TRX port 1 of the first RRU can be connected to the FDD TX port 1 of the combining and splitting unit to realize the transmission of FDD LTE signals, and the corresponding frequency band can be RF1; the FDD RX port 1 of the second RRU can be connected to the FDD RX port 1 of the combining and splitting unit to realize the reception of FDD LTE signals, and the corresponding frequency band can be RF2, that is, the first RRU and the second RRU jointly complete the reception and transmission of FDD LTE signals. In addition, the TDD frequency shift port 1 of the second RRU can be connected to the TDD frequency shift port 1 of the combining and splitting unit, and the TDD frequency shift port 2 of the second RRU can be connected to the TDD frequency shift port 2 of the combining and splitting unit to realize the reception or transmission of two TDD NR signals, and the corresponding frequency bands are RF5+LO1 and RF6+LO, and RF5+LO1=RF6+LO2. During the transmission of the above-mentioned signals, the mixing antenna in the communication system can be used to restore the two frequency-shifted signals (i.e., RF5+LO1=RF6+LO2) to signals of the 3GPP frequency band (e.g., 3.5HGz), thereby realizing dual-stream transmission of TDD NR and single-stream transmission of FDD LTE.

[0072] Optionally, the second RRU can simultaneously obtain information of the five downlink frequency bands RF1, RF5, RF6, LO1, and LO2 through the CPRI interface, and automatically realize intermodulation cancellation value compensation to the uplink service of RF3 inside the second RRU through the internal algorithm solution unit, thereby realizing lossless transmission of 4GLTE services.

[0073] In another example, Figure 6 As shown, the first RRU includes FDD TRX port 1 and FDD TRX port 2 supporting frequency bands RF2 / RF4; the second RRU includes FDD RX port 2 supporting frequency band RF4, TDD frequency shift port 1 supporting frequency band RF5+LO1, and TDD frequency shift port 2 supporting frequency band RF6+LO2; the combining and splitting unit includes FDD TX port 1 supporting frequency band RF1, FDD TX port 2 supporting frequency band RF2, FDD RX port 1 supporting frequency band RF3, FDD RX port 2 supporting frequency band RF4, TDD frequency shift port 1 supporting frequency band RF5+LO1, and TDD frequency shift port 2 supporting frequency band RF6+LO2. Figure 6 The communication system shown can also be called a 1T1RLTE+2T2R NR co-cable transmission networking communication system.

[0074] Specifically, the FDD TRX port 2 of the first RRU can be connected to the FDD TX port 2 of the combining and splitting unit to realize the transmission of FDD LTE signals, and the corresponding frequency band can be RF2; the FDD RX port 2 of the second RRU can be connected to the FDD RX port 2 of the combining and splitting unit to realize the reception of FDD LTE signals, and the corresponding frequency band can be RF4, that is, the first RRU and the second RRU jointly complete the transmission and reception of FDD LTE signals. In addition, the TDD frequency shift port 1 of the second RRU can be connected to the TDD frequency shift port 1 of the combining and splitting unit, and the TDD frequency shift port 2 of the second RRU can be connected to the TDD frequency shift port 2 of the combining and splitting unit to realize the transmission or reception of TDD NR signals, and the corresponding frequency bands are RF5+LO1 and RF6+LO2, and RF5+LO1=RF6+LO2. During the transmission of the above-mentioned signals, the mixing antenna in the communication system can be used to restore the two frequency-shifted signals (i.e., RF5+LO1=RF6+LO2) to signals in the 3GPP frequency band (e.g., 3.5HGz), thereby realizing dual-stream transmission of TDD NR and single-stream transmission of FDDLTE.

[0075] In another example, Figure 7 As shown, the first RRU includes FDD TRX port 1 and FDD TRX port 2 supporting frequency bands RF1 / RF3; the second RRU includes FDD RX port 1 supporting frequency band RF3, and TDD frequency shift port 1 supporting frequency band RF5+LO1; the combining and splitting unit includes FDD TX port 1 supporting frequency band RF1, FDD TX port 2 supporting frequency band RF2, FDD RX port 1 supporting frequency band RF3, FDD RX port 2 supporting frequency band RF4, TDD frequency shift port 1 supporting frequency band RF5+LO1, and TDD frequency shift port 2 supporting frequency band RF6+LO2. Figure 7 The communication system shown can also be called a 1T1R LTE+1T1R NR co-cable transmission networking communication system.

[0076] Specifically, the FDD TRX port 1 of the first RRU can be connected to the FDD TX port 1 of the combiner / splitter unit to realize the transmission of FDD LTE signals, and the corresponding frequency band is RF1; the FDD RX port 1 of the second RRU can be connected to the FDDRX port 1 of the combiner / splitter unit to realize the reception of FDD LTE signals, and the corresponding frequency band is RF3, that is, the first RRU and the second RRU jointly complete the transmission and reception of FDD LTE signals. In addition, the TDD frequency shift port 1 of the second RRU can be connected to the TDD frequency shift port 1 of the combiner / splitter unit to realize the reception and transmission of TDD NR signals, and the corresponding frequency band is RF5+LO1.

[0077] Or, combined Figure 7 ,like Figure 8 As shown, the second RRU includes an FDD RX port 1 supporting the frequency band RF3, and a TDD frequency shift port 2 supporting the frequency band RF6+LO2. The TDD frequency shift port 2 of the second RRU can be used to connect with the TDD frequency shift port 2 of the combining and splitting unit to realize the transmission or reception of TDD NR signals, and the corresponding frequency band is RF6+LO2. Figure 8 The communication system shown can also be called a 1T1R LTE+1T1R NR co-cable transmission networking communication system.

[0078] In another example, Fig. 9 As shown, the first RRU includes FDD TRX port 1 and FDD TRX port 2 supporting frequency bands RF2 / RF4; the second RRU includes FDD RX port 2 supporting frequency band RF4, and TDD frequency shift port 1 supporting frequency band RF5+LO1; the combining and splitting unit includes FDD TX port 1 supporting frequency band RF1, FDD TX port 2 supporting frequency band RF2, FDD RX port 1 supporting frequency band RF3, FDD RX port 2 supporting frequency band RF4, TDD frequency shift port 1 supporting frequency band RF5+LO1, and TDD frequency shift port 2 supporting frequency band RF6+LO2. Fig. 9 The communication system shown can also be called a 1T1R LTE+1T1R NR co-cable transmission networking communication system.

[0079] Specifically, the FDD TRX port 2 of the first RRU can be connected to the FDD TX port 2 of the combining and splitting unit to realize the transmission of FDD LTE signals, and the corresponding frequency band is RF2; the FDD RX port 2 of the second RRU can be connected to the FDDRX port 2 of the combining and splitting unit to realize the reception of FDD LTE signals, and the corresponding frequency band is RF4, that is, the first RRU and the second RRU jointly complete the transmission and reception of FDD LTE signals. In addition, the TDD frequency shift port 1 of the second RRU can be connected to the TDD frequency shift port 1 of the combining and splitting unit to realize the transmission or reception of TDD NR signals, and the corresponding frequency band is RF5+LO1.

[0080] Or, combined Fig. 9 ,like Fig.10 As shown, the second RRU includes an FDD RX port 2 supporting frequency band RF4, and a TDD frequency shift port 2 supporting frequency band RF6+LO2. The TDD frequency shift port 2 of the second RRU can be used to connect with the TDD frequency shift port 2 of the combining and splitting unit to realize the reception or transmission of TDD NR signals, and the corresponding frequency band is RF6+LO2. Fig.10The communication system shown can also be called a 1T1R LTE+1T1R NR co-cable transmission networking communication system.

[0081] In an embodiment of the present application, the first RRU includes at least one FDD transceiver port, the second RRU includes at least one FDD receive port and at least one TDD frequency shift port, and the combining and splitting unit includes at least one FDD transmit port and at least one FDD receive port, so that the communication system can be used to transmit signals of transmission frequency bands corresponding to different communication systems at the same time, and when applied to reusing traditional indoor distributed systems, it is not affected by the frequency bands supported by the reusing traditional indoor distributed systems, thereby realizing the large-bandwidth co-cable deployment evolution of indoor distributed 4G communication systems and 5G NR communication systems, and meeting the needs of maximizing network traffic transmission.

[0082] In another embodiment of the present application, an RRU is further provided, and the RRU may be the second RRU provided above.

[0083] In yet another embodiment of the present application, a combining and splitting unit is further provided, and the combining and splitting unit may be the combining and splitting unit provided above.

[0084] In yet another embodiment of the present application, a communication device is also provided, such as Fig.11 As shown, the communication device includes the first RRU and the second RRU provided above. Further, the communication device may also include the combining and splitting unit provided above.

[0085] It is understandable that the above Figures 2 to 10 All relevant contents of the provided communication system can be referred to in the description of the corresponding embodiments of the above-mentioned RRU, combining and splitting unit and communication device, and the embodiments of the present application will not be repeated here.

[0086] Finally, it should be noted that the above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A radio remote unit, characterized in that: include: At least one frequency division duplex (FDD) receiving port; At least one time division duplex (TDD) frequency shift port for transmitting a radio frequency signal and a local oscillator signal; Among them, the transmission frequency band corresponding to the FDD receiving port is different from the transmission frequency band corresponding to the TDD frequency shift port, and the transmission frequency band corresponding to the TDD frequency shift port is equal to the sum of the frequency band of the RF signal transmitted by the TDD frequency shift port and the frequency band of the local oscillator signal.

2. The radio remote unit according to claim 1, characterized in that: The transmission frequency band corresponding to the at least one frequency division duplex FDD receiving port is the frequency band of the 4G communication system, and the transmission frequency band corresponding to the at least one time division duplex TDD frequency shifting port is the frequency band of the 5G communication system.

3. The radio remote unit according to claim 1 or 2, characterized in that: The at least one FDD receiving port includes a first FDD receiving port, and a transmission frequency band corresponding to the first FDD receiving port is a first frequency band.

4. The radio remote unit according to claim 3, characterized in that: The at least one FDD receiving port further includes a second FDD receiving port, the transmission frequency band corresponding to the second FDD receiving port is a second frequency band, and the first frequency band is different from the second frequency band.

5. The radio remote unit according to any one of claims 1 to 4, characterized in that: The at least one TDD frequency shift port includes a first TDD frequency shift port, and a transmission frequency band corresponding to the first TDD frequency shift port is a third frequency band.

6. The radio remote unit according to claim 5, characterized in that: The at least one TDD frequency shift port further includes a second TDD frequency shift port, the transmission frequency band corresponding to the second TDD frequency shift port is a fourth frequency band, and the third frequency band is different from the fourth frequency band.

7. A combining and splitting unit, characterized in that: include: At least one frequency division duplex (FDD) transmission port; At least one frequency division duplex (FDD) receiving port; At least one time division duplex (TDD) frequency shift port for transmitting a radio frequency signal and a local oscillator signal; Among them, the transmission frequency bands corresponding to the FDD transmitting port and the FDD receiving port are different from the transmission frequency band corresponding to the TDD frequency shift port, and the transmission frequency band corresponding to the TDD frequency shift port is equal to the sum of the frequency band of the RF signal transmitted by the TDD frequency shift port and the frequency band of the local oscillator signal.

8. The combining and splitting unit according to claim 7, characterized in that: The at least one FDD transmitting port includes a first FDD transmitting port, and the transmission frequency band corresponding to the first FDD transmitting port is a first frequency band; the at least one FDD receiving port includes a first FDD receiving port, and the transmission frequency band corresponding to the first FDD receiving port is a second frequency band.

9. The combining and splitting unit according to claim 7 or 8, characterized in that: The at least one FDD transmitting port also includes a second FDD transmitting port, and the transmission frequency band corresponding to the second FDD transmitting port is a third frequency band; the at least one FDD receiving port also includes a second FDD receiving port, and the transmission frequency band corresponding to the second FDD receiving port is a fourth frequency band, and the third frequency band is different from the fourth frequency band.

10. The combining and splitting unit according to any one of claims 7 to 9, characterized in that: The at least one TDD frequency shift port includes a first TDD frequency shift port, and a transmission frequency band corresponding to the first TDD frequency shift port is a fifth frequency band.

11. The combining and splitting unit according to claim 10, characterized in that: The at least one TDD frequency shift port further includes a second TDD frequency shift port, the transmission frequency band corresponding to the second TDD frequency shift port is a sixth frequency band, and the fifth frequency band is different from the sixth frequency band.

12. A communication device, characterized in that: The method comprises a first remote radio frequency unit and a second remote radio frequency unit, wherein the second remote radio frequency unit is the remote radio frequency unit according to any one of claims 1 to 6.

13. The communication device according to claim 12, characterized in that: The communication device also includes: a combining and splitting unit as described in any one of claims 7-11.

14. A communication system, characterized in that: It includes a baseband unit, a first radio frequency remote unit, a second radio frequency remote unit, a combining and splitting unit, a distributed antenna system and a mixing antenna, the second radio frequency remote unit is the radio frequency remote unit as described in any one of claims 1-6, and the combining and splitting unit is the combining and splitting unit as described in any one of claims 7-11.

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