WO2021052209A1

WO2021052209A1 - Radio remote apparatus, active antenna, and base station system

Info

Publication number: WO2021052209A1
Application number: PCT/CN2020/113773
Authority: WO
Inventors: 安涛; 杨蓉; 沈楠; 李名定
Original assignee: 中兴通讯股份有限公司
Priority date: 2019-09-16
Filing date: 2020-09-07
Publication date: 2021-03-25
Also published as: CN112511233A

Abstract

Provided in the present disclosure are a radio remote apparatus, an active antenna, and a base station system. The radio remote apparatus comprises: a first uplink baseband processing module, a first downlink baseband processing module, and a radio frequency processing module. The first uplink baseband processing module is configured to perform physical layer processing on an uplink baseband signal; the first downlink baseband processing module is configured to perform physical layer processing on a downlink baseband signal; and the radio frequency processing module is configured to perform conversion between an uplink baseband signal and a radio frequency signal and conversion between a downlink baseband signal and a radio frequency signal.

Description

Radio remote device, active antenna and base station system

Technical field

The present disclosure relates to the field of wireless communication technology.

Background technique

In a traditional wireless communication system, a base station is divided into a baseband processing unit (Building Base Band Unit, BBU) and a radio remote unit (Radio Remote Unit, RRU). Among them, the baseband processing unit mainly performs baseband processing, including encoding, modulation, layer mapping, resource mapping, etc.; the radio remote unit mainly performs radio frequency signal processing, including baseband signal and radio frequency signal conversion, power amplifier, and filtering. The baseband processing unit and the remote radio unit are used for signal transmission through optical fibers, and the interface between the baseband processing unit and the remote radio unit may adopt a common public radio interface (CPRI). With the increase in the bandwidth of the 5th Generation Mobile Networks (5G) and the surge in traffic, the number of antennas has increased, resulting in an increase in the interface bandwidth requirements of the traditional baseband processing unit and remote radio unit, thereby increasing the The requirement of interface transmission rate increases the cost of network construction.

Summary of the invention

One aspect of the embodiments of the present disclosure provides a remote radio frequency device, including: a first uplink baseband processing module, a first downlink baseband processing module, and a radio frequency processing module, wherein: the first uplink baseband processing module is configured to The signal undergoes physical layer processing; the first downlink baseband processing module is configured to perform physical layer processing on the downlink baseband signal; and, the radio frequency processing module is configured to perform conversion between the uplink baseband signal and the radio frequency signal, and the downlink baseband signal and the radio frequency signal Conversion.

Another aspect of the embodiments of the present disclosure provides an active antenna, which includes the above-mentioned remote radio frequency device, and also includes an antenna device that performs signal transmission with the radio frequency processing module.

Another aspect of the embodiments of the present disclosure provides a base station system, including: a baseband processing device and the above-mentioned active antenna, wherein: the baseband processing device includes: a second uplink baseband processing module and a second downlink baseband processing module; The two uplink baseband processing modules and the first uplink baseband processing module are configured to jointly perform physical layer processing on uplink baseband signals, and the second downlink baseband processing module and the first downlink baseband processing module are configured to jointly perform physical layer processing on downlink baseband signals.层处理。 Layer processing.

Description of the drawings

Fig. 1 is a schematic diagram of a structure of a base station system in the related art.

FIG. 2 is a structural block diagram of a remote radio device provided by an embodiment of the disclosure.

FIG. 3 is a structural block diagram of a baseband processing device and a remote radio device provided by an embodiment of the disclosure.

FIG. 4 is a schematic structural diagram of an uplink baseband processing unit group and a downlink baseband processing group provided by an embodiment of the disclosure.

FIG. 5a is a schematic structural diagram of a baseband processing device and a remote radio frequency device provided by an embodiment of the disclosure.

FIG. 5b is a schematic diagram of another structure of a baseband processing device and a remote radio device provided by an embodiment of the disclosure.

FIG. 5c is a schematic diagram of still another structure of the baseband processing device and the remote radio device provided by the embodiments of the disclosure.

FIG. 6 is a structural block diagram of an active antenna provided by an embodiment of the disclosure.

FIG. 7 is a structural block diagram of a multi-frequency antenna device provided by an embodiment of the disclosure.

FIG. 8 is a schematic structural diagram of a multi-frequency antenna device and a transceiver unit provided by an embodiment of the disclosure.

FIG. 9 is a layout diagram of a 128-antenna dual-band antenna device provided by an embodiment of the disclosure.

FIG. 10 is a schematic diagram of a base station system provided by an embodiment of the disclosure.

detailed description

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

Figure 1 is a structural diagram of a related art base station system. As shown in Figure 1, the base station system includes a baseband processing unit 1 and a radio remote unit 2. The baseband processing unit 1 mainly performs physical layer processing on baseband signals, for example, In the uplink direction, perform fast Fourier transformation, resource inverse mapping, channel estimation and pre-filtering modules, equalization modules, etc.; in the downlink direction, perform layer mapping, precoding, resource mapping, inverse fast Fourier transform modules, etc. The remote radio unit 2 only processes radio frequency signals. The remote radio unit 2 includes an intermediate frequency processing module 2a, a transceiver module 2b, and a filtering module 2c. The baseband processing unit 1 and the remote radio unit 2 perform signal transmission through a fronthaul interface, and the bandwidth requirement of the fronthaul interface is positively correlated with the number of antennas. Therefore, with the increase in the number of antennas in the 5G system, the bandwidth requirement of the interface between the baseband processing unit 1 and the remote radio unit 2 will increase exponentially, resulting in a greater need for the bandwidth between the baseband processing unit 1 and the remote radio unit 2. The optical transmission module with high transmission rate greatly increases the cost of network construction.

The embodiment of the present disclosure provides a remote radio frequency device, and FIG. 2 is a structural block diagram of the remote radio device provided by the embodiment of the present disclosure. As shown in FIG. 2, the remote radio device 20 can be configured to perform conversion between baseband signals and radio frequency signals, and to process radio frequency signals. The remote radio device 20 may also perform a part of physical layer processing. The remote radio device 20 may include: a first uplink baseband processing module 21, a first downlink baseband processing module 22, and a radio frequency processing module 23.

The first uplink baseband processing module 21 may be configured to perform physical layer processing on the uplink baseband signal. The first downlink baseband processing module 22 may be configured to perform physical layer processing on the downlink baseband signal. The first uplink baseband processing module 21 and the first downlink baseband processing module 22 of the remote radio device 20 can both perform signal transmission with the baseband processing device through a signal interface.

Both the first uplink baseband processing module 21 and the first downlink baseband processing module 22 may include at least one baseband processing unit, and each baseband processing unit performs a part of physical layer processing.

The radio frequency processing module 23 may be configured to perform conversion between uplink baseband signals and radio frequency signals, and conversion between downlink baseband signals and radio frequency signals.

FIG. 3 is a structural block diagram of a baseband processing device and a remote radio device provided by an embodiment of the disclosure. As shown in FIG. 3, the baseband processing device 10 can perform signal transmission with multiple radio frequency remote devices 20, and the signal interface between the baseband processing device 10 and the radio frequency remote device 20 is transmitted through optical modules and optical fibers. The first uplink baseband processing module 21 and the first downlink baseband processing module 22 provided in the remote radio device 20 can be configured to complete the global mobile communication system specified by the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) (Global System for Mobile Communication, GSM), Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE; including Frequency Division Duplex FDD and Time Division Duplex TDD) and global 5G standards ( 5GNR) and other physical layer protocols and frame processing protocols to complete the signal processing of the lower physical layer (Low PHY). The baseband processing device 10 may include a second uplink baseband processing module 11 and a second downlink baseband processing module 12, and the second uplink baseband processing module 11 and the second downlink baseband processing module 12 may be configured to complete a higher physical layer (High PHY) Signal processing. The processing modules arranged in the same device can be integrated on the same printed circuit board, so as to perform signal transmission through high-speed transmission signal lines.

In the base station system provided by the embodiment of the present disclosure, the first uplink baseband processing module 21 and the first downlink baseband processing module 22 with a part of the physical layer processing function are moved up to the remote radio device 20; that is, the physical layer Part of the baseband processing function is moved up to the remote radio device 20 for implementation. The bandwidth requirements between the baseband processing modules or units of the physical layer are proportional to the number of streams, but not to the number of antennas; therefore, the first uplink baseband processing module 21 and the first downlink baseband processing module 22 are moved up to the radio frequency. In the remote device 20, the fronthaul bandwidth requirements of the baseband processing device 10 and the radio remote device 20 can be reduced, thereby reducing the transmission rate requirements of the optical module and the optical fiber, and reducing the network construction cost.

In some embodiments, the first uplink baseband processing module 21 may include a part of the uplink baseband processing units in the uplink baseband processing unit group, and the second uplink baseband processing module 11 may include another part of the baseband processing units in the uplink baseband processing unit group. The uplink baseband processing unit group may include a plurality of uplink baseband processing units connected in a second predetermined order.

The first downlink baseband processing module 22 may include a part of the downlink baseband processing modules in the downlink baseband processing unit group, and the second downlink baseband processing module 12 may include another part of the baseband processing units in the downlink baseband processing unit group. The downlink baseband processing unit group may include a plurality of downlink baseband processing units connected in a first predetermined order.

FIG. 4 is a schematic structural diagram of an uplink baseband processing unit group and a downlink baseband processing group provided by an embodiment of the disclosure. As shown in FIG. 4, the multiple uplink baseband processing units in the uplink baseband processing unit group may include: a fast Fourier transform unit 111, a resource inverse mapping unit 112, a channel estimation and pre-filtering unit 113, an equalization unit 114, and a demodulation unit. Unit 115, descrambling unit 116, de-rate matching unit 117, and channel decoding unit 118.

Wherein, the fast Fourier transform unit 111 may be configured to perform CP removal on the uplink baseband signal, and then perform fast Fourier transform (FFT).

The resource inverse mapping unit 112 may be configured to perform resource inverse mapping processing on the uplink baseband signal that has undergone fast Fourier transform.

The channel estimation and pre-filtering unit 113 may be configured to perform channel estimation and prefiltering on the uplink baseband signal that has undergone resource inverse mapping processing.

The equalization unit 114 may be configured to perform channel equalization (equalization) on the pre-filtered uplink baseband signal, and then perform an inverse discrete Fourier transform (IDFT).

The demodulation unit 115 may be configured to demodulate the uplink baseband signal that has undergone inverse discrete Fourier transform (de-modulation).

The descrambling unit 116 may be configured to de-scrambling the demodulated uplink baseband signal.

The rate de-matching unit 117 may be configured to perform rate de-matching on the descrambled uplink baseband signal.

The channel decoding unit 118 may be configured to perform channel decoding (de-coding) on the uplink baseband signal after de-rate matching.

As shown in FIG. 4, the multiple downlink baseband processing units in the downlink baseband processing unit group may include: a channel coding unit 121, a rate matching unit 122, a scrambling unit 123, a modulation unit 124, a layer mapping unit 125, and a precoding unit 126 , The resource mapping unit 127 and the inverse Fourier transform unit 128.

The channel coding unit 121 may be configured to perform channel coding (Coding) on the received downlink baseband signal.

The rate matching unit 122 may be configured to perform rate matching (rate matching) on the channel-coded downlink baseband signal.

The scrambling unit 123 may be configured to perform bit scrambling on the rate-matched downlink baseband signal, and transmit the bit scrambled downlink baseband signal to the modulation unit 124.

The modulation unit 124 may be configured to modulate the received downlink baseband signal.

The layer mapping unit 125 may be configured to perform layer mapping on the modulated downlink baseband signal, and transmit the layer-mapped downlink baseband signal to the precoding unit 126.

The precoding unit 126 may be configured to pre-coding the received downlink baseband signal.

The resource mapping unit 127 may be configured to perform resource mapping (Remapping) on the precoded downlink baseband signal, and transmit the resource-mapped downlink baseband signal to the inverse fast Fourier transform unit 128.

The inverse fast Fourier transform unit 128 may be configured to perform inverse fast Fourier transform (IFFT) on the resource-mapped downlink baseband signal, and then perform cyclic prefix (CP addition).

FIG. 5a is a schematic structural diagram of a baseband processing device and a remote radio frequency device provided by an embodiment of the disclosure. As shown in FIG. 5a, the first uplink baseband processing module 21 may include a fast Fourier transform unit 111, and the first downlink baseband processing module 22 may include an inverse fast Fourier transform unit 128. Specifically, among the multiple uplink baseband processing units of the uplink baseband processing unit group, split between the fast Fourier transform unit 128 and the resource inverse mapping unit 112, and set the fast Fourier transform unit 128 to the radio frequency. In the remote device 20, the resource inverse mapping unit 112 to the channel decoding unit 118 are arranged in the second uplink baseband processing module 11 of the baseband processing device 10. Among the multiple downlink baseband processing units in the downlink baseband processing unit group, the split is performed between the inverse fast Fourier transform unit 128 and the resource mapping unit 127, and the inverse fast Fourier transform unit 128 is set in the remote radio device In 20, the channel encoding unit 121 to the resource mapping unit 127 are set in the second downlink baseband processing module 12 of the baseband processing device 10.

FIG. 5b is a schematic diagram of another structure of a baseband processing device and a remote radio device provided by an embodiment of the disclosure. The difference from FIG. 5a is that the first uplink baseband processing module 21 in FIG. 5b may include a resource inverse mapping unit 112 and a channel estimation and pre-filtering unit 113 in addition to the above-mentioned fast Fourier transform unit 111; In addition to the above-mentioned inverse fast Fourier transform unit 128, the downlink baseband processing module 22 may also include a precoding unit 126 and a resource mapping unit 127. Specifically, splitting is performed between the equalization unit 114 and the channel estimation and pre-filtering unit 113 in the uplink baseband processing unit group, so as to combine the fast Fourier transform unit 111, the resource inverse mapping unit 112, and the channel estimation and pre-filtering unit. 113 is arranged in the first uplink baseband processing module 21 of the remote radio device 20. The equalization unit 114 to the channel decoding unit 118 are arranged in the second uplink baseband processing module 11 of the baseband processing device 10. In addition, in the downlink baseband processing unit group, segmentation is performed between the precoding unit 126 and the layer mapping unit 125, so that the precoding unit 126, the resource mapping unit 127, and the inverse fast Fourier transform unit 128 are set in the radio frequency transmitter. In the first downlink baseband processing module 22 of the remote device 20, the layer mapping unit 125 to the channel coding unit 121 are set in the second downlink baseband processing module 12 of the baseband processing device 10.

FIG. 5c is a schematic diagram of still another structure of the baseband processing device and the remote radio device provided by the embodiments of the disclosure. The difference from FIG. 5b is that, in addition to the fast Fourier transform unit 111, the resource inverse mapping unit 112, and the channel estimation and pre-filtering unit 113, the first uplink baseband processing module 21 in FIG. 5c may also include: an equalization unit 114 and demodulation unit 115. That is, the segmentation is performed between the demodulation unit 115 and the descrambling unit 116 in the uplink baseband processing unit group, thereby combining the fast Fourier transform unit 111, the resource inverse mapping unit 112, the channel estimation and pre-filtering unit 113, and the equalization unit. 114 and the demodulation unit 115 are arranged in the first uplink baseband processing module 21 of the remote radio device 20. The descrambling unit 116, the de-rate matching unit 117, and the channel decoding unit 118 are arranged in the second uplink baseband processing module 11 of the baseband processing device 10. In addition, the segmentation is performed between the scrambling unit 123 and the modulation unit 124 in the downlink baseband processing unit group, so that the modulation unit 124, the layer mapping unit 125, the precoding unit 126, the resource mapping unit 127, and the fast Fourier inverse The conversion unit 128 is set in the first downlink baseband processing module 22 of the remote radio device 20, and the channel encoding unit 121, the rate matching unit 122, and the scrambling unit 123 are set in the second downlink baseband processing module 12 of the baseband processing device 10. in.

For each processing unit, between the scrambling unit 123 and the modulation unit 124, between the descrambling unit 116 and the demodulation unit 115, between the layer mapping unit 125 and the precoding unit 126, and between the equalization unit 114 and the channel estimation and prefiltering unit 113, between the resource mapping unit 127 and the inverse fast Fourier transform unit 128, and between the fast Fourier transform unit 111 and the resource inverse mapping unit 112 can all comply with the eCRPI protocol; therefore, in Figures 5a to In the three structures of 5c, segmentation is performed at the position of eCPRI transmission, thereby reducing the interface transmission rate requirement, while ensuring the normal transmission of the signal between the baseband processing device 10 and the remote radio device 20, and improving the feasibility of application Sex.

In the structures of FIGS. 5a to 5c, moving a part of the uplink baseband processing unit and a part of the downlink baseband processing unit up to the remote radio frequency device 20 can reduce the bandwidth of the interface between the baseband processing device 10 and the remote radio frequency device 20 About 8 times; at the same time, it can be backward compatible with the fourth generation mobile communication technology (4th Generation Mobile Communication Technology, 4G) LTE, facilitating the smooth transition of 4G/5G. In addition, the eCPRI interface protocol is used for signal transmission between the baseband processing device 10 and the remote radio device 20. This transmission mechanism is more flexible, supporting point-to-point, point-to-multipoint, and multi-point-to-point transmission, and supports the network layer. transmission.

In addition, the baseband processing device 10 may further include a MAC module 13 configured to perform MAC (Media Access Control, media access control) layer processing on the signal. The present disclosure may also adopt other module segmentation methods, for example, segmentation is performed between the MAC module 13 and the channel encoding module 121, and between the MAC module 13 and the channel decoding module 118, so as to set the MAC module 13 in the baseband processing. In the device 10, the channel encoding unit 121 to the inverse fast Fourier transform unit 128 and the fast Fourier transform unit 118 to the channel decoding unit 118 are all arranged in the remote radio device 20.

As shown in FIGS. 5a to 5c, in the embodiment of the present disclosure, the radio frequency processing module 23 may include: an intermediate frequency processing unit 231, a transceiver unit 232, and a filtering unit 233. Among them, the intermediate frequency processing unit 231 can be configured to perform conversion between uplink baseband signals and radio frequency signals, and conversion between downlink baseband signals and radio frequency signals. Specifically, it can perform optical interface protocol analysis and mapping, digital up-down conversion, analog-to-digital conversion, and digital-to-analog conversion. Etc.; the transceiver unit 232 may include a transceiver subunit, a power amplifier subunit, and a circulator. The transceiver sub-unit can be configured to complete the conversion of the intermediate frequency signal to the radio frequency signal and the radio frequency signal to the intermediate frequency signal. The filtering unit 233 may be configured to filter the received uplink signal and downlink signal. The embodiment of the present disclosure does not limit the structure of the filter unit 233, which can be flexibly selected according to actual needs, for example, ceramic filters, cavity filters, microstrip filters, etc. can be used.

The embodiment of the present disclosure also provides an active antenna. Fig. 6 is a structural block diagram of the active antenna provided by the embodiment of the present disclosure. As shown in FIG. 6, the active antenna may include the remote radio frequency device 20 in the above-mentioned embodiment, and may also include an antenna device 30 that performs signal transmission with the radio frequency processing module. Wherein, the antenna device 30 and the remote radio device 20 can be combined in the form of an active antenna unit (AAU).

In some embodiments, the antenna device 30 may be a multi-frequency antenna device to achieve multi-frequency common sky. FIG. 7 is a structural block diagram of a multi-frequency antenna device provided by an embodiment of the disclosure, and FIG. 8 is a schematic structural diagram of a multi-frequency antenna device and a transceiver unit provided by an embodiment of the disclosure. As shown in FIG. 7 and FIG. 8, the multi-frequency antenna device may include: an antenna array, a plurality of combining networks 32, a plurality of phase-shifting feeder networks 33, and a plurality of calibration networks (such as the calibration network 341 and calibration network in FIG. 7). Network 342).

The antenna array may include multiple antenna sub-arrays 31, and each antenna sub-array 31 may include at least one antenna unit (such as antenna unit 311 and antenna unit 312 in FIG. 8), and each antenna unit 311/312 covers multiple frequency bands. To send and receive multi-band radio frequency signals. For any two antenna units in the antenna array, the multiple frequency bands covered by one antenna unit correspond to the multiple frequency bands covered by the other antenna unit in a one-to-one correspondence. For example, each antenna unit covers the F1 frequency band and the F2 frequency band; for another example, each antenna unit covers the F1 frequency band, the F2 frequency band and the F3 frequency band.

Taking each antenna unit covering the F1 frequency band and the F2 frequency band as an example, the structure of the antenna device will be described in detail with reference to FIGS. 7 and 8. The radio frequency processing module 23 may include a plurality of transceiver units 232a, and the signals of each frequency band transmitted and received by each antenna sub-array 31 correspond to one transceiver unit 232a. The multiple combined networks 32 correspond to the multiple antenna sub-arrays 31 one-to-one, and the multiple phase-shift feed networks 33 correspond to the multiple antenna sub-arrays 31 one-to-one. Based on this correspondence, the phase-shifting feeder network 33 may include a plurality of phase-shifting feeder units (such as the phase-shifting feeder unit 331 and the phase-shifting feeder unit 332 in FIG. 7), and a plurality of phase-shifting feeder units (331 And 332) have a one-to-one correspondence with multiple frequency bands (F1 frequency band and F2 frequency band) covered by any one antenna unit 311/312. Multiple calibration networks (such as calibration network 341 and calibration network 342 in Figures 7 and 8) correspond to multiple frequency bands (F1 frequency band and F2 frequency band) covered by any one antenna unit 311/312; calibration network 341/342 It can be configured to calibrate the signal transmitted between the radio frequency processing module 23 and the antenna array.

Taking the combining network 32 and the phase-shifting feeder network 33 corresponding to one of the antenna sub-arrays 31 as an example, the structure and function of the combining network 32 and the phase-shifting feeder network 33 will be described. The combined network 32 can be configured to divide the signal from each antenna unit 311/312 in the corresponding antenna sub-array 31 into multiple signals of different frequency bands, and transmit the signals of each frequency band to each one in a one-to-one correspondence. Phase-shifting feeder unit (331 and 332). The phase-shifting feed unit 331 can be configured to phase-shift the signal from the combining network 32 and then transmit it to the calibration network 341 corresponding to the frequency band of the signal; the phase-shifting feed unit 332 can be configured to After the signal of the combined network 32 is phase-shifted, it is transmitted to the calibration network 342 corresponding to the frequency band of the signal.

The phase-shifting feed unit 331 can also be configured to transmit the signal from the calibration network 341 to the combining network 32; the phase-shifting feed unit 332 can also be configured to transmit the signal from the calibration network 342 to the combining network 32. The combining network 32 may also be configured to combine the multi-band signals from the phase-shifting feeding unit 331 and the phase-shifting feeding unit 332 and transmit them to each antenna unit 311/312 in the antenna sub-array 31.

The combiner network 32 may include one-to-one correspondence with the antenna elements in the antenna sub-array 31 (the combiner 321 corresponds to the antenna unit 311 in FIG. 8 and the combiner 322 corresponds to the antenna unit 312 one-to-one) . The combiner 321/322 may include multiple input terminals and one output terminal. Multiple input terminals of the combiner 321 and multiple phase-shifting feed units of the phase-shifting feed network 33 (as shown in Figures 7 and 8) The phase feed unit 331 and the phase shift feed unit 332) are connected in a one-to-one correspondence. The output end of the combiner 321 is connected to the antenna unit 311; multiple input ends of the combiner 322 are connected to the multiple phase shift feed network 33. Two phase-shifting feeding units (such as the phase-shifting feeding unit 331 and the phase-shifting feeding unit 332 in FIGS. 7 and 8) are connected in one-to-one correspondence, and the output end of the combiner 322 is connected to the antenna unit 312.

The combiner 321/322 can be a Wilkinson microstrip combiner, or a combination device based on ceramic or PCB material.

The phase shifting feed unit 331 may include at least one phase shifter 331a connected between the calibration network 341 and the combining network 32, and the phase shifting feed unit 332 may include at least one phase shifter 331a connected between the calibration network 342 and the combining network 32. A phase shifter 332a.

FIG. 8 shows a case where the antenna array includes four antenna sub-arrays 31, and each antenna sub-array 31 includes two antenna units 311. As shown in FIG. 8, the upper and lower antenna units 311 form an antenna sub-array 31, and each antenna unit 311/312 covers the F1 and F2 frequency bands.

In the upstream direction, the multi-band signal received by the antenna unit 311 is divided into two channels of F1 frequency band and F2 frequency band by the combiner 321, and the multi-band signal received by the antenna unit 312 is divided into the F1 frequency band by the combiner 322 And two signals in the F2 frequency band. Taking one of the antenna sub-arrays 31 as an example, the F1 frequency band signal divided by one of the combiner 322 is phase-shifted by the phase shifter 331a, and then combined with the F1 frequency band signal divided by the other combiner 321 and transmitted to The calibration network 341 corresponding to the F1 frequency band, after the signal calibrated by the calibration network 341 is filtered by the filter unit, is transmitted to the transceiver unit 232a corresponding to the antenna sub-array 31 and configured to transmit and receive F1 frequency band signals; similarly, where The signal of the F2 frequency band branched by one combiner 321 is phase-shifted by the phase shifter 332a, combined with the signal of the F2 frequency band branched by the other combiner 322, and then transmitted to the calibration network 342 corresponding to the F2 frequency band, and then passes through the calibration network. The calibrated signal in 342 is filtered by the filtering unit and then transmitted to the transceiver unit 232b corresponding to the antenna sub-array 31 and configured to transmit and receive F2 frequency band signals.

In the downlink direction, taking one of the antenna sub-arrays 31 as an example, the signal of the transceiver unit 232a corresponding to the antenna sub-array 31 and configured to transmit and receive F1 frequency band signals is filtered by the filter unit and transmitted to the corresponding F1 frequency band. The calibration network 341; the signal corresponding to the antenna sub-array 31 and configured to transmit and receive the F2 frequency band transceiver unit 232b is filtered by the filter unit and transmitted to the calibration network 342 corresponding to the F2 frequency band; passes through the calibration network 341 and After the calibration of the calibration network 342, the signals of the F1 frequency band are transmitted to the combiner 321 and the combiner 322 respectively, and the signals of the F2 frequency band are also transmitted to the combiner 321 and the combiner 322, and the combiner 321 receives the F1 frequency band received by it. The signals in the F2 frequency band are combined and transmitted to the corresponding antenna unit 311, and the combiner 322 combines the received signals in the F1 frequency band and the F2 frequency band and transmits them to the corresponding antenna unit 312. Before being transmitted to one of the combiners 322, the signal in the F1 frequency band also passes through the phase shifting process of the phase shifter 331a; before the signal in the F2 frequency band is transmitted to the other combiner 321, it also passes through the phase shifter 332a. Phase process.

It should be noted that the positions of the phase shifter 331a and the phase shifter 332a in FIG. 7 are not particularly limited; for example, the phase shifter 331a can also be arranged between the calibration network 341 and the combiner 321, and the phase shifter 332a is arranged between the calibration network 342 and the combiner 322.

Fig. 9 is a layout diagram of a 128-antenna dual-frequency antenna device provided by an embodiment of the disclosure. As shown in FIG. 9, the antenna device may include multiple dual-polarized antennas, and each dual-polarized antenna may include two antennas with polarization directions orthogonal to each other at +45° and -45°. In Figure 9, among the two dual-polarized antennas adjacent to each other up and down, the two antennas whose polarization directions are both +45° are connected to a combiner 321, and the two antennas whose polarization directions are both -45° are connected to The other combiner 322 is connected. Two antennas with the same polarization direction connected to the same combiner can be used as an antenna unit. The connection relationship of the components in Fig. 9 is similar to that in Fig. 8, except that the phase shifter 331a is adjusted to the calibration network in Fig. 9 Between 341 and the combiner 321, the phase shifter 332a is adjusted between the calibration network 342 and the combiner 322.

In practical applications, the antenna array, calibration network, phase-shifting feeder network and combiner can be integrated on the same printed circuit board. Because the calibration network and phase-shifting feeder units corresponding to different frequency bands are all independent; therefore, in the structure The networks and devices can be distributed in a staggered manner to ensure the compactness of the structure. Of course, the calibration network can also be set on the same circuit board as the transceiver unit, so as to achieve integration with the transceiver unit. For example, the calibration network is set between the circulator and the filter unit, and the signal calibration is completed by coupling and sampling the signal transmitted between the circulator and the filter unit.

The embodiment of the present disclosure also provides a base station system. FIG. 10 is a schematic diagram of the base station system provided by the embodiment of the present disclosure. As shown in FIG. 10, the base station system may include a baseband processing device 10 and an active antenna (that is, the above-mentioned radio frequency processing device 20 and antenna device 30), and the baseband processing module 10 may include: a second uplink baseband processing module 11 and a second downlink baseband Processing module 12. The second uplink baseband processing module 11 and the first uplink baseband processing module 21 may be configured to jointly perform physical layer processing on the uplink baseband signal. The second downlink baseband processing module 12 and the first downlink baseband processing module 22 may be configured to jointly perform physical layer processing on the downlink baseband signal.

As described above, the first uplink baseband processing module may include a part of the uplink baseband processing unit in the uplink baseband unit group, and the second uplink baseband processing module may include another part of the baseband processing unit in the uplink baseband processing unit group. The first downlink baseband processing module may include a part of the downlink baseband processing units in the downlink baseband processing unit group, and the second downlink baseband processing module may include another part of the baseband processing units in the downlink baseband processing unit group.

As shown in FIG. 4, the multiple uplink baseband processing units in the uplink baseband processing unit group may include: a fast Fourier transform unit 111, a resource inverse mapping unit 112, a channel estimation and pre-filtering unit 113, an equalization unit 114, and a demodulation unit. Unit 115, descrambling unit 116, de-rate matching unit 117, and channel decoding unit 118. The multiple downlink baseband processing units in the downlink baseband processing unit group may include: a channel coding unit 121, a rate matching unit 122, a scrambling unit 123, a modulation unit 124, a layer mapping unit 125, a precoding unit 126, a resource mapping unit 127 and Inverse Fourier transform unit 128.

The role of each baseband processing unit has been described above, and will not be repeated here. The optional structure of the baseband processing device is also described above, and will not be repeated here.

It can be understood that the above implementations are merely exemplary implementations used to illustrate the principle of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also deemed to be within the protection scope of the present disclosure.

Claims

A remote radio frequency device includes: a first uplink baseband processing module, a first downlink baseband processing module, and a radio frequency processing module, wherein:

The first uplink baseband processing module is configured to perform physical layer processing on uplink baseband signals;

The first downlink baseband processing module is configured to perform physical layer processing on downlink baseband signals; and

The radio frequency processing module is configured to perform the conversion of the uplink baseband signal and the radio frequency signal and the conversion of the downlink baseband signal and the radio frequency signal.
The radio frequency remote device according to claim 1, wherein:

The first uplink baseband processing module includes: a fast Fourier transform unit configured to perform cyclic prefix removal on the uplink baseband signal, and then perform fast Fourier transform; and

The first downlink baseband processing module includes: an inverse fast Fourier transform module, configured to perform an inverse fast Fourier transform on the received downlink baseband signal, and then add a cyclic prefix.
The remote radio frequency device according to claim 2, wherein:

The first uplink baseband processing module further includes: a resource inverse mapping unit configured to perform resource inverse mapping processing on the uplink baseband signal that has undergone fast Fourier transform; and a channel estimation and pre-filtering unit configured to Performing channel estimation and pre-filtering on the uplink baseband signal that has undergone resource inverse mapping processing; and

The first downlink baseband processing module further includes: a precoding module configured to precode the received downlink baseband signal; and a resource mapping module configured to perform precoding on the downlink baseband The signal is subjected to resource mapping, and the downlink baseband signal after the resource mapping is transmitted to the inverse fast Fourier transform module.
The radio frequency remote device according to claim 3, wherein:

The first uplink baseband processing module further includes: an equalization unit configured to perform channel equalization on the pre-filtered uplink baseband signal, and then perform inverse discrete Fourier transform; and, a demodulation unit, configured to Demodulate the uplink baseband signal that has undergone inverse discrete Fourier transform; and

The first downlink baseband processing module further includes: a modulation module configured to modulate the received downlink baseband signal; and a layer mapping module configured to perform layering on the modulated downlink baseband signal Mapping, and transmitting the layer-mapped downlink baseband signal to the precoding module.
An active antenna, comprising the remote radio frequency device according to any one of claims 1 to 4, and further comprising an antenna device for signal transmission with the radio frequency processing module.
The active antenna according to claim 5, wherein the antenna device comprises: an antenna array, multiple combining networks, multiple phase-shifting feed networks, and multiple calibration networks, wherein:

The antenna array includes multiple antenna sub-arrays, each of the antenna sub-arrays includes at least one antenna element, and each antenna element covers multiple frequency bands; for any two antenna elements, one of the antenna elements The multiple frequency bands covered are the same in one-to-one correspondence with multiple frequency bands covered by another antenna unit;

The multiple combination networks correspond to the multiple antenna sub-arrays one-to-one; the multiple phase-shift feed networks correspond to the multiple antenna sub-arrays one-to-one; each of the phase-shift feed networks includes A plurality of phase-shifting feed units, the plurality of phase-shifting feed units correspond to the multiple frequency bands covered by any one of the antenna units one-to-one; the multiple calibration networks correspond to the multiple frequency bands covered by any one of the antenna units One-to-one correspondence between multiple frequency bands; the calibration network is configured to calibrate the signal transmitted between the radio frequency processing module and the antenna array;

The combination network is configured to divide the signal from each antenna unit into multiple signals of different frequency bands, and transmit the signals of each frequency band to each of the phase-shifting feed units in a one-to-one correspondence; the The phase-shifting feed unit is configured to phase-shift the signal from the combining network and then transmit it to the calibration network corresponding to the frequency band of the signal; and

The phase-shifting feed unit is further configured to transmit signals from the calibration network to the combining network; the combining network is also configured to transmit the signals from the plurality of phase-shifting feed units After the signals of the multiple frequency bands are combined, they are transmitted to each of the antenna elements in the antenna sub-array.
The active antenna according to claim 6, wherein:

The combining network includes a combiner corresponding to the antenna elements in the antenna sub-array one-to-one; the combiner includes a plurality of input terminals and an output terminal, and the multiple inputs of the combiner Terminals are connected to the plurality of phase-shifting feed units of the phase-shifting feed network in a one-to-one correspondence, and the output terminal of the combiner is connected to the antenna unit; and

The phase shifting feed unit includes at least one phase shifter connected between the calibration network and the combining network.
The active antenna according to claim 6, wherein the radio frequency processing module comprises:

An intermediate frequency processing unit configured to perform conversion between the uplink baseband signal and an intermediate frequency signal, and conversion between the downlink baseband signal and the intermediate frequency signal;

A transceiver unit configured to perform conversion between the intermediate frequency signal and the radio frequency signal; and

The calibration network and the transceiver unit are arranged on the same circuit board.
A base station system, comprising: a baseband processing device and the active antenna according to any one of claims 5 to 8, wherein:

The baseband processing device includes: a second uplink baseband processing module and a second downlink baseband processing module;

Wherein, the second uplink baseband processing module and the first uplink baseband processing module are configured to jointly perform physical layer processing on the uplink baseband signal, and the second downlink baseband processing module and the first downlink baseband processing module The baseband processing module is configured to jointly perform physical layer processing on the downlink baseband signal.
The base station system according to claim 9, wherein:

The first uplink baseband processing module includes a part of uplink baseband processing units in the group of uplink baseband processing units;

The second uplink baseband processing module includes another part of the baseband processing unit in the uplink baseband processing unit group;

The first downlink baseband processing module includes a part of downlink baseband processing units in a group of downlink baseband processing units;

The second downlink baseband processing module includes another part of the downlink baseband processing unit in the group of downlink baseband processing units;

The multiple uplink baseband processing units in the uplink baseband processing unit group include: a fast Fourier transform unit, a resource inverse mapping unit, a channel estimation and pre-filtering unit, an equalization unit, a demodulation unit, a descrambling unit, and a de-scrambling unit. Rate matching unit and channel decoding unit; and

The plurality of downlink baseband processing units in the downlink baseband processing unit group includes: a channel coding unit, a rate matching unit, a scrambling unit, a modulation unit, a layer mapping unit, a precoding unit, a resource mapping unit, and a fast Fourier Inverse transformation unit.