A relay device and method

Abstract

The present invention provides a relay device and method, belonging to the technical field of wireless communication. The relay device includes: a plurality of filters, each filter being used to filter signals of at least one frequency band, the guard band between the frequency bands filtered by one filter being greater than a first preset value and / or the isolation requirement being lower than a second preset value, and the guard band between the frequency bands filtered by different filters being less than a third preset value and / or the isolation requirement being higher than a fourth preset value; each frequency band corresponds to at least one path, and each path is used to forward signals of the corresponding frequency band. The relay device provided by the present invention obtains multiple host base station signals through the MIMO channel, improves the rate, and in addition, can also reduce the volume occupied by the filters in the multi-band multi-mode relay device.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a relay device and method. Background Art

[0002] Currently, in many scenarios, signals in wireless communication transmissions need to be amplified. One application scenario is on the transmission link between a base station and a terminal. It is necessary to receive the downlink signal of the base station through a backhaul antenna, filter the received signal through a band-pass filter, and then amplify the filtered signal through a power amplifier and transmit it through a coverage antenna to the coverage area for terminals within the coverage area to receive. Additionally, it is also necessary to receive the uplink signal of terminals within the coverage area through the coverage antenna, filter the received signal through a band-pass filter, and then amplify the filtered signal through a power amplifier and transmit it through the backhaul antenna for the base station to receive.

[0003] For example, in the high-speed rail scenario of the fifth-generation mobile communication technology (5G), due to the good sealing, high speed, and concentrated users of high-speed rail trains, it is very difficult to apply 5G network coverage in the high-speed rail scenario. Currently, the mainstream frequency bands of 5G New Radio (NR) are 2.6G, 3.5G, and 4.9G, which are much higher than the 1.8GHz frequency band of the existing Long Term Evolution (LTE) network. There is no clear linear relationship between the penetration loss and the frequency used by the network, but for the same medium, the penetration loss increases with the increase in frequency. Therefore, compared with 4G LTE, it is more difficult to achieve coverage for 5G NR. To cover the interior of high-speed rail cars, if the deployment density of stations along the high-speed rail line is increased, the cost will be greatly increased. Therefore, it can be considered to add a backhaul antenna on the top of the car body and add a micro-amplification device in the car to improve the coverage inside the car. There is also a need for signal relaying to complete the signal transmission between an outdoor base station and terminals in a basement scenario. Summary of the Invention

[0004] The present invention provides a relay device and method for solving the problem of the large volume of filters in current signal relay devices with multiple frequency bands and multiple channels.

[0005] To solve the above technical problems, in a first aspect, the present invention provides a relay device, including:

[0006] Multiple filters, each filter is used to filter signals of at least one frequency band, the guard band between the frequency bands filtered by one filter is greater than a first preset value and / or the isolation requirement is lower than a second preset value, and the guard band between the frequency bands filtered by different filters is less than a third preset value and / or the isolation requirement is higher than a fourth preset value;

[0007] Each of the frequency bands corresponds to at least one path, and each of the paths is used for signal forwarding of the corresponding frequency band.

[0008] Optionally, each of the paths is provided with a gain adjustment module; the device further includes:

[0009] A micro control unit, which is respectively connected to the gain adjustment module to adjust the gain of the corresponding path.

[0010] Optionally, the relay device further includes: an antenna, a coupler and a synchronization module;

[0011] One end of the coupler is connected to the antenna, and the other end is connected to the synchronization module, and the synchronization module is connected to the micro control unit;

[0012] The synchronization module obtains information related to the signal strength of each of the frequency bands through the coupler;

[0013] The micro control unit calculates the gain required for each of the frequency bands according to the information related to the signal strength, and adjusts the gain of the path corresponding to each of the frequency bands through the gain adjustment module.

[0014] Optionally, the frequency band includes a time division multiplexing frequency band;

[0015] A controllable switch is provided on the path corresponding to the time division multiplexing frequency band;

[0016] The relay device further includes: an antenna, a coupler, a synchronization module and a micro control unit. One end of the coupler is connected to the antenna, the other end is connected to the synchronization module, the synchronization module is connected to the micro control unit, and the micro control unit is respectively connected to the control end of the controllable switch;

[0017] The micro control unit controls the on and off of the controllable switch according to the signal output by the synchronization module to perform uplink and downlink switching.

[0018] Optionally, the relay device further includes: a housing;

[0019] The multiple filters are respectively located at different positions within the housing; or,

[0020] The multiple filters are respectively located in different housings.

[0021] In a second aspect, the present invention further provides a relay method, which is applied to any one of the relay devices described in the first aspect above. The method includes:

[0022] Receiving a signal;

[0023] Filter the received signal through multiple filters, each filter being used to filter signals of at least one frequency band, the guard band between the frequency bands filtered by one filter being greater than a first preset value and / or the isolation requirement being lower than a second preset value, and the guard band between the frequency bands filtered by different filters being less than a third preset value and / or the isolation requirement being higher than a fourth preset value;

[0024] Send the signals of multiple frequency bands obtained by filtering through the multiple filters through corresponding paths after amplification; each frequency band corresponds to at least one of the paths.

[0025] Optionally, after receiving the signal, it further includes:

[0026] Obtain information related to the signal strength of each frequency band in the received signal;

[0027] Calculate the gain required for each frequency band according to the signal strength related information;

[0028] Adjust the gain of the path corresponding to each frequency band according to the calculated gain required for each frequency band.

[0029] Optionally, the signal strength related information includes signal field strength and / or reference signal received power RSRP.

[0030] Optionally, the adjusting the gain of the path corresponding to each frequency band according to the calculated gain required for each frequency band includes:

[0031] If self-oscillation occurs between the paths, reduce the gain of one of the paths.

[0032] Optionally, the difference between the gain of the path for uplink forwarding and the gain of the path for downlink forwarding in the path corresponding to one frequency band is a fifth preset value.

[0033] Optionally, the frequency band includes a time division multiplexing frequency band; the method further includes:

[0034] Determine the uplink and downlink switching times of each time division multiplexing frequency band according to the received signal.

[0035] Optionally, the determining the uplink and downlink switching times of each time division multiplexing frequency band according to the received signal includes:

[0036] Determine the first uplink and downlink switching time of the first frequency band among the multiple time division multiplexing frequency bands according to the received signal;

[0037] Determine the time difference between the second uplink and downlink switching time of the second frequency band other than the first frequency band among the multiple time division multiplexing frequency bands and the first uplink and downlink switching time;

[0038] Send a switching control signal to the controllable switch of the path corresponding to the first frequency band at the first uplink-downlink switching time;

[0039] After the time interval corresponding to the time difference, send a switching control signal to the controllable switch of the path corresponding to the second frequency band.

[0040] Optionally, the method further includes:

[0041] Detect whether the uplink-downlink time slot ratio of the second frequency band has changed;

[0042] If the uplink-downlink time slot ratio of the second frequency band has changed, adjust the time difference.

[0043] Optionally, the detecting whether the uplink-downlink time slot ratio of the second frequency band has changed includes:

[0044] Detect the downlink power during the busy time of the second frequency band;

[0045] If the power reduction of the downlink power meets the first preset condition, it is determined that the uplink-downlink time slot ratio of the second frequency band has changed.

[0046] Optionally, the if the uplink-downlink time slot ratio of the second frequency band has changed, then adjusting the time difference includes:

[0047] Adjust the time difference according to a preset step size until the downlink power during the busy time of the second frequency band rises to meet the second preset condition.

[0048] The beneficial effects of the above technical solutions of the present invention are as follows:

[0049] The relay device in the embodiment of the present invention obtains multiple host base station signals through the MIMO channel, improving the rate. In addition, the traditional filters integrated together are divided into multiple independent filters according to the frequency interval. Specifically, the frequency bands with small guard bands and high isolation requirements can be placed in different filters to increase the isolation through space, and then the other frequency bands with small isolation requirements can be allocated to the corresponding filters as needed. Thereby, the volume occupied by the filters in the relay device can be reduced. Description of the Drawings

[0050] Figure 1 It is a schematic structural diagram of a relay device in an embodiment of the present invention;

[0051] Figure 2 It is a schematic structural diagram of another relay device in an embodiment of the present invention;

[0052] Figure 3 It is a schematic flowchart of a relay method in an embodiment of the present invention;

[0053] Figure 4 Schematic diagram of frequency bands of multiple systems for multiple operators

[0054] Figure 5 and Figure 6 Schematic diagram of a circuit structure for filtering signals of B1 + B3 frequency band and B39 frequency band in different filters in an embodiment of the present invention

[0055] Figure 7 Schematic diagram of the structure of a relay device in an embodiment of the present invention Detailed implementation manners

[0056] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0057] Traditional micro amplifiers (or micro amplification devices) are all single-channel. For 4G / 5G systems, they can only produce single-stream effects, and the rate improvement is not obvious. In the 4G era, there are high-power repeaters with dual channels, but there are no micro repeaters with dual channels. Moreover, conventional micro amplification devices only support one or more frequency bands of one operator, or several consecutive frequency bands of multiple operators, such as traditional 1.8G repeaters.

[0058] Currently, while the indoor coverage demand develops from single-frequency to multi-frequency, due to the coexistence of multiple-mode networks (2G / 3G / 4G / 5G), if multiple operators each install one set or multiple sets of equipment for their own frequency bands, it is easy to cause the problem of resource waste due to excessive equipment quantity. Therefore, an embodiment of the present invention proposes a relay device that supports multiple-input multiple-output (MIMO) and supports multiple frequency bands of multiple operators. When applied to the high-speed rail scenario, the relay device can be composed of a backhaul antenna and a vehicle-mounted micro amplifier host, overcoming the carriage loss, improving the in-vehicle signal coverage quality, increasing the spacing between macro base stations along the line, and being installed on the train once, reducing the impact on the train.

[0059] However, in the case of supporting multiple frequency bands and multiple channels, a series of coexistence problems will occur. One of the coexistence problems is that in the conventional allocation method, all frequency bands are allocated through one filter. When there are many frequencies to be filtered and the guard bands of some frequencies are very small, the volume of the filter will be very large. To solve this coexistence problem, the embodiments of the present invention provide the following technical solutions.

[0060] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a relay device provided in the first embodiment of the present invention. The relay device includes:

[0061] A plurality of filters 11, each filter is used to filter signals of at least one frequency band. The guard band between the frequency bands filtered by one filter is greater than a first preset value and / or the isolation requirement is lower than a second preset value. The guard band between the frequency bands filtered by different filters is less than a third preset value and / or the isolation requirement is higher than a fourth preset value;

[0062] The first preset value may be greater than the third preset value or equal to the third preset value. The second preset value may be less than the fourth preset value or equal to the fourth preset value;

[0063] The plurality of filters form a filter bank;

[0064] Each frequency band corresponds to at least one path 12, and each path is used to forward signals of the corresponding frequency band. Specifically, in the embodiment of the present invention, one amplification path may be configured for each frequency band, or multiple amplification paths may be configured according to the target coverage performance. For example, for 4G uplink and downlink, two paths are used, and for 5G downlink, four paths are used and for 5G uplink, two paths are used. Each path can complete the signal amplification function according to the configuration of the microcontroller unit (MCU).

[0065] Among them, the filter may be a reversible device, that is, the filter can also be used as a combiner. When the signal travels from the first end of the filter to the second end, signals of multiple frequency bands can be filtered out respectively. When the signal travels from the second segment of the filter to the first end, signals of the frequency bands can be combined. The first end of the filter may have only one input terminal (which can also be used as an output terminal), and the second end of the filter may have multiple output terminals (which can also be used as input terminals).

[0066] Optionally, the relay device may further include a plurality of filters symmetrically arranged with the above-mentioned plurality of filters. The above-mentioned plurality of filters may be referred to as the first filters, and those symmetrically arranged with the first filters may be referred to as the second filters. When the first filter is used as a filter, the second filter is used as a combiner. When the first filter is used as a combiner, the second filter is used as a filter. The symmetrically arranged filters serve as both ends of the path. The path between each pair of filters is used to transmit signals of the frequency bands filtered by the filters, and signals of each frequency band can be transmitted by multiple paths.

[0067] In addition, it should be noted that the said path can also be referred to as a channel or a link, and signals of one frequency band or multiple frequency bands can be transmitted thereon.

[0068] In the relay device according to the embodiment of the present invention, multiple host base station signals are obtained through the MIMO channel to improve the rate. In addition, the filters that are conventionally integrated are divided into multiple independent filters according to the frequency interval. Specifically, the frequency bands with small guard bands and high isolation requirements can be placed in different filters to increase the isolation through space, and then the other frequency bands with small isolation requirements can be allocated to the corresponding filters as needed. Thereby, the volume occupied by the filters in the relay device can be reduced.

[0069] In addition, the embodiment of the present invention can also determine the isolation degree of the first-stage filter according to the requirements of weight and volume. If the first-stage isolation degree does not meet the requirements, an additional stage can be supplemented as needed.

[0070] Optionally, a gain adjustment module is provided in each said path; the device further includes:

[0071] A microcontroller unit (MCU), which is respectively connected to the gain adjustment module to adjust the gain of the corresponding path.

[0072] The relay device provided by the embodiment of the present invention supports MIMO paths, and there may be problems such as unbalanced gains between paths, self-oscillation between paths, and poor MINO effects. To solve this problem, the embodiment of the present invention provides a gain adjustment module in each path. By setting the gain and combining the external feedback of the MIMO effect, the range of the gain when the MIMO optimization performance is achieved is found. Within the acceptable range of the MIMO performance, the gain is further adjusted to maintain the balance of the two paths. If self-oscillation occurs, the gain of one of the paths is reduced to make the device work stably first.

[0073] Optionally, the relay device further includes: an antenna, a coupler, and a synchronization module;

[0074] One end of the coupler is connected to the antenna, and the other end is connected to the synchronization module, and the synchronization module is connected to the microcontroller unit;

[0075] The synchronization module obtains the signal strength-related information of each said frequency band through the coupler;

[0076] The microcontroller unit calculates the gains required for each said frequency band according to the signal strength-related information, and adjusts the gains of the corresponding paths of each said frequency band through the gain adjustment module.

[0077] For example, the synchronization module obtains the signal field strength of each frequency band of each operator. The MCU calculates the gain required for each frequency band based on the current signal field strength, and there are multiple methods:

[0078] Method 1: Adjust the gain according to the total strength of the received signal to maintain the stability of the output;

[0079] Method 2: Adjust the gain according to the strength of the reference signal received power (RSRP) of the received signal to maintain the stability of the RSRP output.

[0080] Optionally, the frequency band includes a time division duplexing (TDD) frequency band; that is, among the multiple frequency bands supported by the relay device provided in the embodiments of the present invention, there is a time division duplexing frequency band;

[0081] A controllable switch is arranged on the path corresponding to the time division duplexing frequency band;

[0082] The relay device further includes: an antenna, a coupler, a synchronization module, and a micro control unit. One end of the coupler is connected to the antenna, and the other end is connected to the synchronization module. The synchronization module is connected to the micro control unit, and the micro control unit is respectively connected to the control end of the controllable switch;

[0083] The micro control unit controls the on / off of the controllable switch according to the signal output by the synchronization module to perform uplink and downlink switching.

[0084] Among them, the antenna can be a backhaul antenna, and the backhaul antenna is used to receive the downlink signal of the host base station and at the same time transmit the uplink signal of the terminal to the host base station. Each TDD frequency band corresponds to at least two paths, including an uplink path and a downlink path.

[0085] In the embodiments of the present invention, for the TDD frequency band, the MCU gives an uplink and downlink switching signal through the output of the synchronization module to enable the uplink and downlink switching of the TDD frequency band.

[0086] Optionally, the relay device further includes a housing;

[0087] The multiple filters are respectively located at different positions within the housing; or,

[0088] The multiple filters are respectively located in different housings.

[0089] Below, taking Figure 2 as an example, briefly describe the functions of each component in the relay device provided in the embodiments of the present invention, Figure 2Schematic diagram of the structure of another relay device provided by an embodiment of the present invention. The relay device mainly includes the following components:

[0090] Backhaul antenna 201: Used to receive the downlink signal of the host base station and at the same time backhaul the uplink signal of the terminal to the host base station;

[0091] Coupler 202: Couples a part of the downlink power of the host base station and is used for TDD system synchronization.

[0092] Filter bank 203a: Divides the received signal into multiple signals according to frequency bands and distributes the corresponding signals to the corresponding paths; The symmetrically arranged filter bank 203b combines the signals of multiple frequency bands on multiple paths.

[0093] Frequency Division Duplexing (FDD) band uplink 204: Completes the amplification of the uplink signal in the FDD band.

[0094] FDD band downlink 205: Completes the amplification of the downlink signal in the FDD band.

[0095] TDD band uplink 206: Completes the amplification of the uplink signal in the TDD band.

[0096] TDD band downlink 207: Completes the amplification of the downlink signal in the TDD band.

[0097] Switch 208: Used for switching between the uplink and downlink of the TDD band.

[0098] Synchronization module 209: Demodulates the uplink and downlink switching indication signals by receiving the signal of the host base station and is used to control the uplink and downlink switching of the TDD band.

[0099] Coverage antenna 210: Used to transmit the signal within its coverage area and complete the coverage of the terminals within the enhanced coverage area.

[0100] Power supply module 211: Supplies power to each module inside the device.

[0101] MCU 212: Completes the uplink and downlink switching of the TDD system and completes the gain control of the uplink and downlink links of each frequency band.

[0102] Please refer to Figure 3 , Figure 3 Schematic diagram of the process of a relay method provided by Embodiment 2 of the present invention. This method is applied to the relay device described in the above embodiment. The method includes the following steps:

[0103] Step 31: Receive the signal; Specifically, when forwarding the downlink, the signal can be received by the backhaul antenna; when forwarding the uplink, the signal can be received by the coverage antenna;

[0104] Step 32: Filter the received signal through multiple filters, where each filter is used to filter signals of at least one frequency band. The guard band between the frequency bands filtered by one filter is greater than a first preset value and / or the isolation requirement is lower than a second preset value, and the guard band between the frequency bands filtered by different filters is less than a third preset value and / or the isolation requirement is higher than a fourth preset value;

[0105] Step 33: Send the signals of multiple frequency bands obtained by filtering through the multiple filters after amplifying them through corresponding paths respectively; each frequency band corresponds to at least one of the paths. Specifically, when forwarding downstream, the amplified signal can be sent by the covering antenna; when forwarding upstream, the amplified signal can be sent by the backhaul antenna.

[0106] As described in the above embodiments, the relay device may further include multiple filters symmetrically arranged with the above multiple filters. The above multiple filters may be referred to as the first filters, and those symmetrically arranged with the first filters may be referred to as the second filters. When the first filters are used as filters, the second filters are used as combiners, and when the first filters are used as combiners, the second filters are used as filters. The symmetrically arranged filters serve as both ends of the path.

[0107] In the above step 13, when sending the signals of multiple frequency bands obtained by filtering through the multiple filters after amplifying them through corresponding paths respectively, specifically, the signals of one or more frequency bands obtained by filtering through one filter are amplified through one or more corresponding paths of this filter respectively, and then are synthesized by the combiner symmetrically arranged with this filter and sent out.

[0108] In the embodiments of the present invention, the filters that are traditionally integrated are divided into multiple independent filters according to the frequency interval. Specifically, the frequency bands with small guard bands and high isolation requirements can be placed in different filters to increase the isolation through space, and then the other frequency bands with small isolation requirements are allocated to the corresponding filters as needed. Thereby, the overall volume of the filters in the relay device can be reduced.

[0109] The following is an example to illustrate the above relay method.

[0110] Optionally, after receiving the signal, it further includes:

[0111] Obtain the signal strength related information of each frequency band in the received signal; the signal strength related information of each frequency band can be obtained by the synchronization module in the above embodiments;

[0112] Calculate the required gain for each frequency band according to the signal strength related information; specifically, the MCU can be used to calculate the gain;

[0113] According to the calculated gains required for each of the frequency bands, adjust the gains of the channels corresponding to each of the frequency bands. Specifically, the gains of the corresponding channels can be adjusted by the gain adjustment modules provided on each channel in the above embodiments. For example, after the MCU calculates the gain, it can send a control signal to the gain adjustment module on the corresponding channel, and then the gain adjustment module adjusts the gain of that channel.

[0114] Optionally, the signal strength related information includes signal field strength and / or reference signal receiving power (RSRP).

[0115] In the embodiments of the present invention, adjusting the gain according to the signal field strength of the signals in each frequency band can maintain the stability of the output. Adjusting the gain according to the RSRP strength of the signals in each frequency band can maintain the stability of the RSRP output.

[0116] Optionally, when calculating the gains required for each of the frequency bands according to the signal strength related information, specifically, according to the signal strength related information of each frequency band in the received signal and the power requirement during transmission, for example, the transmission power requirement determined according to the coverage requirement, calculate the range of gains that meet the requirements. When adjusting the gains of the channels corresponding to each of the frequency bands according to the calculated gains required for each of the frequency bands, within the range, adjust the channel gains.

[0117] Adjusting the gains of the channels corresponding to each of the frequency bands according to the calculated gains required for each of the frequency bands includes:

[0118] If self-excitation occurs between the channels, reduce the gain of one of the channels so that the device can work stably first.

[0119] Specifically, after self-excitation occurs between channels, the MCU can control the gain adjustment module to reduce the gain of one of the channels.

[0120] In the embodiments of the present invention, by adjusting the gains of each channel, the balance between multiple channels is maintained, self-excitation between channels is avoided, and the MIMO effect is improved.

[0121] Optionally, the difference between the gain of the channel for uplink forwarding and the gain of the channel for downlink forwarding in the channels corresponding to one frequency band is the fifth preset value.

[0122] In the embodiments of the present invention, the uplink and downlink gains are linked to maintain a fixed difference, and this difference is 0 dB under normal conditions.

[0123] In addition, when the gain is too large and exceeds the maximum output power of the channel, the gain is limited to the maximum output power.

[0124] Optionally, the frequency band includes a time division multiplexing frequency band; the method includes:

[0125] Determine the uplink and downlink switching times of each time division multiplexing frequency band according to the received signal.

[0126] Specifically, a microcontroller unit may determine the uplink and downlink switching times of each time division multiplexing frequency band according to the received signal.

[0127] Optionally, the determining the uplink and downlink switching times of each time division multiplexing frequency band according to the received signal includes:

[0128] Determine the first uplink and downlink switching time of a first frequency band among multiple time division multiplexing frequency bands according to the received signal; the first frequency band may be a frequency band of a certain operator;

[0129] Determine the time difference between the second uplink and downlink switching time of a second frequency band other than the first frequency band among the multiple time division multiplexing frequency bands and the first uplink and downlink switching time;

[0130] Send a switching control signal to the controllable switch of the path corresponding to the first frequency band at the first uplink and downlink switching time;

[0131] After the time interval corresponding to the time difference, send a switching control signal to the controllable switch of the path corresponding to the second frequency band.

[0132] The above steps may be executed by a microcontroller unit.

[0133] In an embodiment of the present invention, the synchronization module, which may also be referred to as a modem module, can be customized for a certain operator to give uplink and downlink switching signals. Under normal conditions, there is a fixed time difference between the uplink and downlink switching signals of the TDD frequency bands of other operators and the uplink and downlink switching signals of the TDD frequency band of the customized operator, and the switching time is given by delaying through the MCU.

[0134] Optionally, the method further includes:

[0135] Detect whether the uplink and downlink time slot ratio of the second frequency band changes;

[0136] If the uplink and downlink time slot ratio of the second frequency band changes, adjust the time difference.

[0137] For example, when customized for a certain operator, it is necessary to detect whether the time slot ratio of the TDD frequency band of other operators changes. If it changes, the time delay needs to be adjusted.

[0138] In one optional specific implementation manner, the detecting whether the uplink and downlink time slot ratio of the second frequency band changes includes:

[0139] Detect the downlink power during the busy period of the second frequency band;

[0140] If the reduced power of the downlink power meets the first preset condition, it is determined that the uplink and downlink time slot ratio of the second frequency band has changed.

[0141] The busy period of the second frequency band refers to using the resources of the second frequency band to send data, which can also be called the busy period of services.

[0142] For example, if the downlink power during the busy period of the second frequency band drops significantly, it can be determined that the uplink and downlink time slot ratio of the second frequency band has changed.

[0143] In another optional specific implementation manner, the detection of whether the uplink and downlink time slot ratio of the second frequency band has changed includes:

[0144] Detect the downlink power during the idle period of the second frequency band at the downlink input end, and at this time, there is only the power of broadcast information;

[0145] If the increased power of the downlink power meets the preset condition, it is determined that the uplink and downlink time slot ratio of the second frequency band has changed. For example, when the idle period power rises significantly, it can be determined that the uplink and downlink time slot ratio of the second frequency band has changed.

[0146] Optionally, if the uplink and downlink time slot ratio of the second frequency band has changed, adjusting the time difference includes:

[0147] Adjust the time difference according to a preset step size until the downlink power during the busy period of the second frequency band rises to meet the second preset condition. Specifically, the micro control unit can adjust the time difference according to the preset step size.

[0148] In the embodiment of the present invention, when adjusting the above-mentioned time delay, the downlink power during the busy period of services can be statistically analyzed while the MCU adjusts the time delay according to a fixed step size until the detected downlink power remains the same as before or the difference is less than the preset threshold.

[0149] In the embodiment of the present invention, when detecting and determining whether the uplink and downlink time slot ratio of the second frequency band has changed and adjusting the time delay, the accuracy can be improved after increasing the number of times.

[0150] The following is an example to illustrate the relay device and relay method in the above embodiments.

[0151] The repeater (i.e., the relay device) supports multiple frequency bands (as shown in Table 1 below) and multiple channels. Among them, the 5G frequency band has 4 channels, and the 4G frequency band has 2 channels.

[0152] Table 1

[0153]

[0154] The repeater supports N41, N78, Band1 + Band3, and B39. Among them, N41 and N78 are 4-channel, and the others are 2-channel. There is only a 5M guard band between B1, B39, and B3. As Figure 4 shown, the downlink of B3 interferes with the uplink of B39, and the downlink of B39 interferes with the uplink of B1. Therefore, as Figure 5 and 6 shown, the 4-channel devices are divided into two groups, one group for B1 and B3, and the other group for B39 alone, which can increase the isolation. N41 and N78 are available in each path to achieve 2 transmit and 4 receive. Band1 and Band3 are synthesized into one channel through a diplexer using the film bulk acoustic resonator (FBAR) process. For other frequency bands, according to the actual situation, filters can be considered to be added or not. Considering the control of the same frequency band not crossing the housing to reduce the system complexity, it is divided into the upper and lower housing structures 71 and 72 as Figure 7 shown. For the adjacent B1 + B3 and B39, they are placed on different sides to increase isolation, and the requirements for the relevant combiners 710 and 720 are the same as those for the high-frequency bands; B8 and B5 are placed on different sides to increase isolation. Since B8 and B5 are 9MHz apart, the cavity combiners for the corresponding channels need to be designed with enhanced suppression.

[0155] Band28 and Band5 are synthesized into one channel through a customized combiner. The two frequency bands are 22MHz apart, and interference suppression is performed through the combiner.

[0156] In addition, the relay device may further include a shielding cover 721, a radio frequency board 722, and heat dissipation teeth 723.

[0157] The base station in the embodiment of the present invention may be a base transceiver station (BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA), or a NodeB (NB) in Wideband Code Division Multiple Access (WCDMA), or an evolved base station (eNB or eNodeB) in LTE, or a relay station or an access point, or a base station in the future 5G network, etc., which is not limited herein.

[0158] The terminal in the embodiments of the present invention may be a wireless terminal. A wireless terminal may be a device that provides voice and / or other service data connectivity to users, such as a handheld device with wireless connection capabilities or other processing devices connected to a wireless modem. The wireless terminal may communicate with one or more core networks via a Radio Access Network (RAN). The wireless terminal may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it may be a portable, pocket-sized, handheld, computer-integrated or vehicle-mounted mobile device that exchanges voice and / or data with the wireless access network. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA), etc. The wireless terminal may also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile, remote station, remote terminal, access terminal, user terminal, user agent, terminal (user device or user equipment), which is not limited herein.

[0159] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A relay method, characterized in that: The method comprises: Receive signals; Filtering the received signal through multiple filters, each filter is used to filter signals of at least one frequency band, a guard band between frequency bands filtered by one filter is greater than a first preset value and / or an isolation requirement is lower than a second preset value, and a guard band between frequency bands filtered by different filters is less than a third preset value and / or an isolation requirement is higher than a fourth preset value; Each of the frequency bands corresponds to at least one channel, and each of the channels is used to forward signals of the corresponding frequency band; The first preset value is greater than or equal to the third preset value, and the second preset value is less than or equal to the fourth preset value; The frequency band includes a time division multiplexing frequency band; the method further includes: Determining the uplink and downlink switching time of each time-division multiplexing frequency band according to the received signal; determining the uplink and downlink switching time of each time-division multiplexing frequency band according to the received signal includes: Determining, according to the received signal, a first uplink / downlink switching time of a first frequency band among the plurality of time division multiplexing frequency bands; Determine a time difference between a second uplink / downlink switching time of a second frequency band other than the first frequency band in the plurality of time division multiplexing frequency bands and the first uplink / downlink switching time; Sending a switching control signal to the controllable switch of the path corresponding to the first frequency band during the first uplink / downlink switching time; After a time interval corresponding to the time difference, a switching control signal is sent to the controllable switch of the path corresponding to the second frequency band; The method further includes: detecting whether the uplink and downlink time slot ratio of the second frequency band changes; and adjusting the time difference if the uplink and downlink time slot ratio of the second frequency band changes.

2. The method according to claim 1, characterized in that After filtering the received signal through a plurality of filters, the method further includes: The signals of the multiple frequency bands obtained by filtering the multiple filters are amplified and sent out through corresponding channels respectively; each of the frequency bands corresponds to at least one channel.

3. The method according to claim 1, characterized in that After receiving the signal, the method further includes: Obtaining information related to the signal strength of each frequency band in the received signal; Calculating the required gain for each of the frequency bands based on the signal strength related information; According to the calculated gain required for each of the frequency bands, the gain of the path corresponding to each of the frequency bands is adjusted.

4. The method according to claim 3, characterized in that The signal strength related information includes signal field strength and / or reference signal received power RSRP.

5. The method according to claim 3, characterized in that The adjusting the gain of the path corresponding to each of the frequency bands according to the calculated gain required for each of the frequency bands includes: If self-excitation between the paths occurs, the gain of one of the paths is reduced.

6. The method according to claim 3, characterized in that The difference between the gain of the path used for uplink forwarding and the gain of the path used for downlink forwarding in the paths corresponding to one of the frequency bands is a fifth preset value.

7. The method according to claim 1, characterized in that The detecting whether the uplink and downlink time slot ratio of the second frequency band changes includes: detecting downlink power of the second frequency band when it is busy; If the power of the downlink power reduction meets a first preset condition, it is determined that the uplink and downlink time slot ratio of the second frequency band is changed.

8. The method according to claim 7, characterized in that If the uplink and downlink time slot ratio of the second frequency band changes, adjusting the time difference includes: The time difference is adjusted according to a preset step size until the downlink power of the second frequency band during the busy period increases to meet a second preset condition.

9. A relay device, characterized in that: The device is used to perform the method according to any one of claims 1 to 8, and the device comprises: Multiple filters, each of the filters is configured to filter signals of at least one frequency band, a guard band between frequency bands filtered by one filter being greater than a first preset value and / or an isolation requirement being lower than a second preset value, and a guard band between frequency bands filtered by different filters being less than a third preset value and / or an isolation requirement being higher than a fourth preset value; Each of the frequency bands corresponds to at least one channel, and each of the channels is used to forward signals of the corresponding frequency band; The first preset value is greater than or equal to the third preset value, and the second preset value is less than or equal to the fourth preset value; The frequency band includes a time division multiplexing frequency band; A controllable switch is provided on the path corresponding to the time division multiplexing frequency band; The relay device further includes: an antenna, a coupler, a synchronization module, and a micro control unit, wherein one end of the coupler is connected to the antenna and the other end is connected to the synchronization module, the synchronization module is connected to the micro control unit, and the micro control unit is respectively connected to the control end of the controllable switch; The micro control unit controls the on and off of the controllable switch according to the signal output by the synchronization module to perform uplink and downlink switching.

10. The device according to claim 9, characterized in that Each of the paths is provided with a gain adjustment module; The micro control units are respectively connected to the gain adjustment modules to adjust the gains of the corresponding channels; The synchronization module obtains information related to the signal strength of each of the frequency bands through the coupler; The micro control unit calculates the gain required for each of the frequency bands according to the signal strength related information, and adjusts the gain of the path corresponding to each of the frequency bands through the gain adjustment module.

11. The device according to claim 9, characterized in that Also includes: case; The multiple filters are respectively located at different positions in the housing; or, The multiple filters are respectively located in different housings.

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