Patent Description:
As scientific technologies grow, <NUM> applications are gradually entering people's work and life, and service requirements promote the development of networks. The main features of <NUM> networks are larger bandwidth, lower latency, and more connections. In order to obtain larger bandwidth, higher C-band and millimeter waves are introduced into indoor <NUM> networks. Higher frequencies need greater transmission power. Insufficient indoor coverage may be caused by the use of traditional <NUM> networking method.

Currently, most indoor distribution systems have been deployed during the <NUM> and <NUM> network infrastructure construction indoor. The indoor distribution systems consist of high-power signal sources, combiners, power splitter, feeder lines, and antennas, which have the advantage of low cost and high reliability.

However, the existing indoor distribution system has the following shortcomings: <NUM>. it is inconvenient to upgrade and expand the <NUM> hardware capacity in the future because of being limited by the selection of power amplifiers at the back end of the radio frequency, which may easily lead to the increase of potential cost; <NUM>. it cannot meet coverage requirements of <NUM> indoor distribution systems because of being limited by the output power of the remote coverage unit.

<CIT> discloses a baseband processing unit which includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta- sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

The purpose of the present invention is to overcome the defects of the prior art and provide a remote device and a <NUM> distributed system.

In order to achieve the above mentioned goal, the present invention provides the following technical solution: a remote device which is remotely connected to a near-end unit connected to a base station transceiver, comprising a unit including at least one remote non-frequency-conversion processing unit and at least one remote frequency conversion processing unit, the remote frequency conversion processing unit used to perform frequency conversion processing or restoration frequency conversion processing on a first signal and output the processed first signal, and the first signal including <NUM> signal, the remote non-frequency conversion processing unit used to directly output a second signal without being processed by frequency conversion, and the second signal including any combination of one or more of <NUM> signal, <NUM> signal, and <NUM> signal.

Preferably, the remote frequency conversion processing unit comprises at least one <NUM> remote processing unit, and the <NUM> remote processing unit comprises a <NUM> remote downlink processing unit, a <NUM> remote uplink processing unit and a first switching unit, the <NUM> remote downlink processing unit is used to perform frequency conversion processing on a <NUM> downlink radio frequency signal and then output the processed <NUM> downlink radio frequency signal to the first switching unit, the <NUM> remote uplink processing unit is used to restore frequency conversion processing on the <NUM> uplink radio frequency signal transmitted by the first switching unit and then output the restored signal, the first switching unit is used for switching the upper and lower radio frequency signals.

Preferably, each of the <NUM> remote downlink processing unit and the <NUM> remote uplink processing unit comprises a <NUM> converter and a <NUM> adjustment unit connected to the <NUM> converter, the <NUM> adjustment unit of the <NUM> remote downlink processing unit is connected to the first switching unit, and the <NUM> converter of the <NUM> remote uplink processing unit is connected to the first switching unit.

Preferably, the <NUM> remote downlink processing unit further comprises a synchronization module, the synchronization module includes a coupler and a synchronization unit, and the coupler is connected to the <NUM> converter of the <NUM> remote downlink processing unit, one end of the synchronization unit is connected to the coupler, and the other end of the synchronization unit is connected to the first switching unit, the coupler couples <NUM> downlink signals to the synchronization unit to control the first switching unit.

Preferably, the <NUM> down-converter of the <NUM> remote downlink processing unit and the <NUM> up-converter of the <NUM> remote uplink processing unit are connected together with frequency providing unit for providing a local oscillator frequency or connected with a frequency providing unit for providing a local oscillator frequency respectively.

Preferably, the <NUM> adjustment unit comprises a <NUM> remote first amplifier, a <NUM> remote second amplifier, and a first signal adjuster connected between the <NUM> remote first amplifier and the <NUM> remote second amplifier connected in series in sequence.

Preferably, the non-frequency-conversion processing unit includes any combination of one or more than two of a number of <NUM> remote processing units, a number of <NUM> remote processing units, and a number of <NUM> remote processing units, and each of the <NUM> remote processing unit, <NUM> remote processing unit, and <NUM> remote processing unit includes a remote downlink processing unit, a remote uplink processing unit, and a second switching unit, and the remote downlink processing unit is used to perform frequency conversion processing on the downlink second signal and output the processed downlink second signal to the second switching unit, the remote uplink processing unit is used to restore frequency conversion processing on the uplink second signal transmitted from the second switching unit and output the restored signal, the second switching unit is used to switch the uplink and downlink second signals.

Preferably, the remote device further comprises a first transmission module and a first multi-frequency combiner, and the first transmission module is connected to one end of the remote unit to transmit radio frequency signals, the first multi-frequency combiner is connected to the other end of the remote unit to split or combine the radio frequency signals.

Preferably, the remote device further comprises a remote power supply unit for supplying power to the remote unit, and the remote power supply unit is connected to the first multi-frequency.

Preferably, the remote supply unit is disposed outside the remote unit or the remote supply unit is integrated in the remote unit.

Preferably, the remote device further comprises a passive network unit, and when the remote supply unit is disposed outside the remote unit, the passive network unit is connected to the remote supply unit, and when the remote power supply unit is built in the remote unit, the passive network unit is connected to the first multi-frequency combiner.

Preferably, the first switching unit and the second switching unit are implemented by radio frequency switches and/or duplexers.

In addition, the present invention discloses a <NUM> distributed system, comprising a near-end unit, the remote device according to the above mentioned embodiment, and an active antenna unit, the near-end unit connected to the remote device, and the active antenna unit connected to the remote device and performing restoration frequency conversion processing on the first signal output by the remote device and outputting the restored signal to an antenna, or performing frequency conversion processing on the first signal input from the antenna and outputting the processed first signal to the remote device, and directly output the second signal received from the antenna or received from the remote device without being processed by frequency conversion.

In a preferred embodiment, the active antenna unit comprises a second multi-frequency combiner, at least one active frequency conversion processing unit and at least one antenna, and the second multi-frequency combiners are connected to the remote device, and the antenna is indirectly connected to the second multi-frequency combiner through the active frequency conversion processing unit, and is directly connected to the second multi-frequency combiner, the first signal transmitted from the remote device is processed by the active frequency conversion processing unit and then output to the antenna, and the second signal transmitted from the remote device is directly output from the antenna without being processed by frequency conversion.

In a preferred embodiment, the active frequency conversion processing unit includes a first switch, an active downlink processing unit, an active uplink processing unit, and a second switch, the first switch is connected to the second multi-frequency combiner, the active downlink processing unit and the active uplink processing unit are connected in parallel between the first switch and the second switch, and the second switch is connected to the antenna.

The beneficial effects of the present invention are as follows:.

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

The present invention discloses a remote device and a <NUM> distributed system, <NUM> signals will be transmitted to a remote active antenna unit after frequency conversion processing at the remote device, and signals of other standards other than <NUM> signals will be directly transmitted to the remote active antenna unit for realizing signal coverage without frequency conversion processing, which meets the coverage requirements of <NUM> indoor distribution.

As shown in <FIG>, the <NUM> distributed system disclosed in embodiment <NUM> of the present invention includes a near-end unit (MU) <NUM>, a remote device <NUM>, and an active antenna unit <NUM>, wherein the near-end unit <NUM> is connected with the base station transceiver (BTS), the base station transceiver receives or transmits SISO signals and/or MIMO signals, including but not limited to <NUM> signals, <NUM> signals, <NUM> signals and <NUM> signals, such as public network mobile communications, private network mobile communications, cable service, IoT service, digital TV. The invention covers the signal source access in the frequency range of <NUM>~<NUM>.

As shown in <FIG>, the near-end unit <NUM> of this embodiment specifically includes a third multi-frequency combiner <NUM>, a near-end signal processing unit <NUM>, a combiner unit <NUM>, and a second transmission module <NUM>, where the third multi-frequency combiner <NUM> is used for receiving or transmitting SISO signals and/or MIMO signals. In other embodiments, the near-end unit may not be provided with a third multi-frequency combiner, and signals transmitted by the BTS may be directly input into corresponding near-end signal processing units.

The near-end signal processing unit <NUM> includes a near-end non-frequency conversion processing unit and a near-end frequency conversion processing unit. The near-end non-frequency conversion processing unit includes one or more of a number of <NUM> near-end processing units, a number of <NUM> near-end processing units, and a number of <NUM> near-end processing units, such as several <NUM> near-end processing units, or one <NUM> near-end processing unit and two <NUM> near-end processing units, etc. The near-end frequency conversion processing unit includes several <NUM> near-end processing units. The near-end non-frequency conversion processing unit is used to output other standards other than <NUM> signals directly without performing frequency conversion on them; the near-end frequency conversion processing unit is used to perform non-frequency conversion processing on <NUM> signals and output them. In this embodiment, for the near-end signal processing unit, the structure of the <NUM> near-end processing unit is substantially the same as those of <NUM> near-end processing units, <NUM> near-end processing units, and <NUM> near-end processing units, while there are differences in performance parameters of the internal function modules.

In an implementation, a <NUM> near-end processing unit may include a <NUM> single-input single-output near-end unit and/or a <NUM> multiple-input multiple-output near-end unit, and a <NUM> near-end processing unit may include a <NUM> single-input single-output near-end unit and/or a <NUM> multiple-input multiple-output near-end unit, and the internal modules of the <NUM> single-input single-output near-end unit, the <NUM> multiple-input multiple-output near-end unit, the <NUM> single-input single-output near-end unit, the <NUM> multiple-input multiple-output near-end unit are the same as those of the above-mentioned various near-end processing units, details won't be described here.

As shown in <FIG>, one end of the combiner unit <NUM> is connected to the near-end signal processing unit <NUM>, and the other end of the combiner unit <NUM> is connected to the second transmission module <NUM>, and the combiner unit <NUM> is used to combine the downlink radio frequency signal transmitted from the near-end signal processing unit <NUM> and output the combined signal to the second transmission module <NUM>, or split the uplink radio frequency signal transmitted from the second transmission module <NUM> and output the split signal to the near-end signal processing unit <NUM>. The second transmission module <NUM> includes at least one near-end optical module 1016a for receiving or transmitting SISO signals and/or MIMO signals, and performing photoelectric conversion on SISO signals and/or MIMO signals. The present invention does not limit the specific structure of the near-end unit, that is, the structure of the near-end unit will not be limited as described in embodiment <NUM>.

As shown in <FIG>, the remote device <NUM> is connected to the near-end unit <NUM> for performing frequency conversion processing or restoration frequency conversion processing on <NUM> signal received from the near-end unit <NUM> or the active antenna unit <NUM>, and signals of other standards other than <NUM> signals are directly transmitted to the active antenna unit <NUM> without being performed frequency conversion processing by the remote device <NUM>, or the near-end unit <NUM> will directly receive other modes other than <NUM> signal from the active antenna unit <NUM> without being performed frequency conversion processing by the remote device <NUM>. In this embodiment <NUM>, the remote device <NUM> specifically includes a remote unit <NUM>, a first multi-frequency combiner <NUM>, a remote power supply unit <NUM>, and a passive network unit <NUM>. As shown in <FIG> and <FIG>, one end of the remote unit <NUM> is connected to the near-end unit <NUM>, and the other end is connected to the first multi-frequency combiner <NUM>, which specifically includes a first transmission module 1020a and a remote signal processing unit. The first transmission module 1020a is coupled to the second transmission module <NUM> of the near-end unit <NUM>. The first transmission module 1020a includes at least one remote optical module 1120a and a power splitting and combining unit 1120b. Each remote optical module 1020a is connected with a respective near-end optical module 1016a of the near-end unit <NUM>, and is used for performing photoelectric conversion on SISO signals and/or MIMO signals.

The power splitting and combining unit is connected to the remote optical module 1120a, and is used to split the downlink SISO signals and/or MIMO signals transmitted from the remote optical module 1120a and output the split signals, or combine the uplink radio frequency signals and output the combined signals to the remote optical module 1120a.

In an implementation, the remote signal processing unit may include multiple signal processing units that process signals of different standards. Specifically, the remote signal processing unit includes a remote frequency conversion processing unit and a remote non-frequency conversion processing unit. The remote frequency conversion processing unit at least includes several <NUM> remote processing units for processing <NUM> signals. In embodiment <NUM>, corresponding to the near-end unit <NUM>, the remote non-frequency conversion processing unit of the remote unit <NUM> includes one or more of several <NUM> remote processing units, several <NUM> remote processing units, and several <NUM> remote processing units.

And wherein, a <NUM> remote processing unit includes a <NUM> single input single output remote unit and/or a <NUM> multiple-input multiple-output remote unit. The internal functional modules of the <NUM> single-input single-output remote units and the <NUM> multiple-input multiple-output remote units have the same structure, which each includes a <NUM> remote downlink processing unit <NUM>, a <NUM> remote uplink processing unit <NUM>, and a first switching unit <NUM>, as shown in <FIG>. And wherein, the <NUM> remote downlink processing unit <NUM> includes a <NUM> down-converter 402a and a <NUM> downlink adjustment unit 402b, one end of the <NUM> down-converter 402a is connected to the power splitting and combining unit 1120b of the first transmission module 1020a, and the other end of the <NUM> down-converter 402a is connected to one end of the <NUM> downlink adjustment unit 402b for performing frequency conversion processing on the downlink radio frequency signal transmitted from the first transmission module 1020a; the other end of the <NUM> downlink adjustment unit 402a is connected to the first switching unit <NUM> for adjusting the downlink frequency conversion signal. Similarly, the <NUM> remote uplink processing unit <NUM> includes a <NUM> up-converter 404a and a <NUM> uplink adjustment unit 404b. One end of the <NUM> up-converter 404a is connected to the first switching unit <NUM>, and the other end of the <NUM> up-converter 404a is connected to one end of the <NUM> uplink adjustment unit 404b to restore the frequency conversion signal transmitted by the first switching unit <NUM> to an uplink radio frequency signal, and the other end of the <NUM> uplink adjustment unit 404b is connected to the first transmission module 1020a (as shown in <FIG>) for adjusting the uplink radio frequency signal. In this embodiment, the <NUM> downlink adjustment unit 402b specifically includes a <NUM> remote first amplifier <NUM>, a first signal adjuster <NUM>, and a <NUM> remote second amplifier <NUM> connected in series in sequence, and the <NUM> uplink adjustment unit 404b specifically includes a <NUM> remote second amplifier <NUM>, a first signal adjuster <NUM>, and a <NUM> remote second amplifier <NUM> connected in series in sequence. The <NUM> remote first amplifiers <NUM>, <NUM> and the <NUM> remote second amplifiers <NUM>, <NUM> are all used to amplify the link radio frequency signal, the first signal adjusters <NUM>, <NUM> are used to adjust the size of the uplink and downlink signals respectively. In an implementation, each of the first signal adjuster <NUM>, <NUM> may be a digital attenuator.

The first switching unit <NUM> is connected to the first multi-frequency combiner <NUM>, and is used for switching the radio frequency signal between uplink and downlink. In this embodiment <NUM>, as shown in <FIG>, the first switching unit <NUM> is implemented as a radio frequency switch, which is connected to both the <NUM> remote downlink processing unit <NUM> and the <NUM> remote uplink processing unit <NUM>, and is used for switching signal between uplink and downlink. The radio frequency switch is also connected in series with a filter <NUM>, which is connected between the radio frequency switch and the first multi-frequency combiner <NUM> and is used for filtering the downlink radio frequency signal or the uplink radio frequency signal output by the radio frequency switch.

Preferably, as shown in <FIG>, the <NUM> remote downlink processing unit <NUM> further includes a synchronization module <NUM>. The synchronization module <NUM> includes a coupler 530a and a synchronization unit 530b. The coupler 530a is connected between the <NUM> down-converter 402a and the first transmission module 1020a, and one end of the synchronization unit 530b is connected to the coupler 530a. The other end of the synchronization unit 530b is connected to the first switching unit <NUM>, the coupler 530a couples <NUM> downlink signals to the synchronization unit 530b, and the synchronization unit 530b performs baseband decoding and outputs time slot control signals to perform upper and lower time slot switching control on the radio frequency switch.

Preferably, as shown in <FIG>, the <NUM> down-converter 402a and the <NUM> up-converter 404a are connected to a frequency providing unit <NUM> together or to a frequency providing unit <NUM> respectively, and the frequency providing unit <NUM> is used to provide local oscillators frequency for the <NUM> down-converter 402a and the <NUM> up-converter 404a. In an implementation, the frequency providing unit <NUM> is implemented as a phase-locked loop (PLL).

In embodiment <NUM>, the <NUM> remote processing unit also includes a <NUM> single-input single-output remote unit and/or a <NUM> multiple-input multiple-output remote unit. In embodiment <NUM>, the <NUM> remote processing unit, the <NUM> remote processing unit and the <NUM> remote processing unit have the same internal functional module structure, as shown in <FIG>, each including a remote downlink processing unit <NUM>, a remote uplink processing unit <NUM> and a second switching unit <NUM>, wherein both ends of the remote downlink processing unit <NUM> and the remote uplink processing unit <NUM> are respectively connected to the first transmission module 1020a and the second switching unit <NUM>, and the remote downlink processing unit <NUM> and the remote uplink processing unit <NUM> are used to perform adjustment processing on the uplink and downlink signals transmitted from the first transmission module, respectively. The second switching unit <NUM> is connected to the first multi-frequency combiner <NUM>, and is used to isolate and filter the uplink signals and the downlink signals and output them. In this embodiment <NUM>, the second switching unit <NUM> is implemented using a duplexer. It should be noted that the first switching unit <NUM> and the second switching unit <NUM> can be implemented using radio frequency switches and/or duplexers. Generally, <NUM> and <NUM> mode signals may use FDD and/or TDD communication modes, and FDD generally uses duplexers, TDD generally uses radio frequency switches.

In this embodiment <NUM>, the remote downlink processing unit <NUM> include a remote third amplifier <NUM>, a second signal adjuster <NUM>, and a remote fourth amplifier <NUM> that are connected in series in sequence, and the remote uplink processing unit <NUM> include a remote third amplifier <NUM>, a second signal adjuster <NUM>, and a remote fourth amplifier <NUM> that are connected in series in sequence, and the remote third amplifiers <NUM>, <NUM> and the remote fourth amplifiers <NUM>, <NUM> are used to amplify the link radio frequency signal, and the second signal adjusters <NUM>, <NUM> are used to adjust the size of the uplink and downlink signals. In an implementation, the second signal adjuster may be implemented as a digital attenuator.

The remote power supply unit <NUM> is used to supply power to the remote unit <NUM>. In embodiment <NUM>, the remote power supply unit <NUM> is disposed outside the remote unit <NUM>. At this time, the remote unit <NUM> is connected between the first multi-frequency combiner <NUM> and the passive network unit <NUM>, as shown in <FIG>. In this embodiment, the remote power supply unit <NUM> includes a power feeder and a power supply connected to the power feeder.

The passive network unit <NUM> is connected to the remote supply unit <NUM>, and is used to distribute the front-end signal to different multiple active antenna units <NUM> through a coupler or a power splitter, so as to achieve the purpose of extending the transmission coverage of the signal source.

The active antenna unit and the passive network unit are connected through a transmission medium, and are used to restore the downlink intermediate frequency signal output by the remote device to a radio frequency signal and then output it, or convert the uplink radio frequency signal received into an uplink intermediate frequency signal and send it to the remote device. As shown in <FIG>, in this embodiment, the active antenna unit <NUM> specifically includes a second multi-frequency combiner 103a, at least one active frequency conversion processing unit 103b, and at least one antenna. The second multi-frequency combiner 103a is connected to the passive network unit <NUM> through the transmission medium, and is used for splitting the signal transmitted by the remote device and outputting it or combining the received signal and outputting the combined signal to the remote device <NUM>.

The active frequency conversion processing unit is used to perform frequency conversion on or restore signals including <NUM> signal and output them. In this embodiment <NUM>, each active frequency conversion processing unit 103b specifically includes a first switch <NUM>, an active downlink processing unit, an active uplink processing unit, and a second switch <NUM>. The first switch <NUM> is connected to the second multi-frequency combiner 103a, the second switch <NUM> is connected with an antenna, and the active downlink processing unit and the active uplink processing unit are connected in parallel between the first switch <NUM> and the second switch <NUM>. Both the active downlink processing unit and the active uplink processing unit include a frequency converter <NUM> and an amplifier <NUM> connected in series.

In this embodiment, there are two antennas, which are defined as antenna 103c and antenna 103d. Antenna 103c is indirectly connected to the second multi-frequency combiner 103a through an active frequency conversion processing unit 103b, and is also connected to the second multi-frequency combiner 103a. Similarly, the antenna 103d is indirectly connected to the second multi-frequency combiner 103a through an active frequency conversion processing unit 103b, and is also directly connected to the second multi-frequency combiner 103a. The <NUM> signal transmitted from the remote device <NUM> will output to the antenna 103c and/or antenna 103d after being restored frequency conversion processing by the active frequency conversion processing unit 103b. The signals of other modes transmitted by the remote device are directly output from the antenna 103c and/or antenna 103d without being processed by frequency conversion.

The working principle of the <NUM> distributed system of the present invention is specifically as follows:
Downlink: The near-end unit receives SISO signals and/or MIMO signals sent by the base station, and after being split by the third multi-frequency combiner, the downlink signals of multiple modes (including <NUM> to <NUM>) enter each of respective near-end downlink processing units of various near-end processing units of near-end unit respectively to be sequentially amplified, adjusted, and amplified, and then be combined by the combiner unit and then output to the second transmission module. The second transmission module converts the SISO signals and/or MIMO signals into an optical signal and then output the optical signal to the remote unit. The first transmission module of the remote unit converts the optical signal into an electrical signal and splits the signal and outputs the split signal to the remote non-frequency conversion processing unit and the remote frequency conversion processing unit. The <NUM> remote downlink processing unit of the <NUM> remote processing unit of the remote frequency conversion processing unit performs frequency conversion, amplification, size adjustment, and amplification processing on the <NUM> signal in sequence, and then outputs the processed signal to the first multi-frequency combiner. The signals of other modes are not processed by frequency conversion and are output to the first multi-frequency combiner by being processed by corresponding signal processing unit. The first multi-frequency combiner transmits the signal to the active antenna unit through the passive network unit. In the active antenna unit, after being split by the second multi-frequency combiner, the <NUM> signal are output to the active frequency conversion processing unit for restoring frequency conversion and then will be output through the antenna. The SISO signals and /MIMO signals of other modes are output directly without being processed by frequency conversion.

The working principle of the uplink is opposite to that of the downlink, details won't be described here.

As shown in <FIG>, it is a <NUM> distributed system disclosed in embodiment <NUM> of the present invention. The difference from embodiment <NUM> is that the remote power supply unit is built in the remote unit, eliminating the need for an external remote power supply unit. As shown in <FIG>, each of the <NUM> single input single output units and the <NUM> multiple-input multiple-output units has a remote power supply unit. One end of the remote power supply unit is connected to the first switching unit of the <NUM> remote processing unit, and the other end of the remote power supply unit is connected to the first multi-frequency combiner. The remote power supply unit is built-in to improve the overall integration of the remote device. Of course, the signal processing units corresponding to the <NUM> remote processing unit of other modes can also be provided with a remote supply unit.

Claim 1:
A remote device (<NUM>) for being remotely connected to a near-end unit (<NUM>) connected to a base station transceiver, wherein the remote device comprises a unit (<NUM>) including at least one remote non-frequency-conversion processing unit and at least one remote frequency conversion processing unit, characterized in that the remote frequency conversion processing unit is configured to perform frequency conversion processing or restoration frequency conversion processing on a first signal and output the processed first signal, and the first signal including <NUM> signal, the remote non-frequency-conversion processing unit is configured to directly output a second signal without being processed by frequency conversion, and the second signal including any combination of one or more of <NUM> signal, <NUM> signal, and <NUM> signal.