CN115967966A - Relay coverage system and multi-channel time delay balancing method thereof - Google Patents
Relay coverage system and multi-channel time delay balancing method thereof Download PDFInfo
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Abstract
The invention relates to a relay coverage system and a multi-channel time delay balancing method thereof. The method comprises an initialization step and an adjustment step. The initialization step includes: detecting the time delay value of each channel of the relay coverage system; the adjusting step comprises: s13, selecting the maximum time delay value as the reference time delay according to the time delay values of all the channels; s15, calculating the difference value of other channels of the relay coverage system relative to the reference time delay; and S17, if the difference value of a certain channel is greater than a preset threshold value, performing time delay offset on the time delay of the channel, so that the difference value between the time delay offset of the channel and the reference time delay does not exceed the preset threshold value. The invention can control the time delay difference value of multiple channels of the relay coverage system in a very small range, and reduce the negative influence of user service perception caused by overlarge time delay difference value to the maximum extent.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a relay coverage system and a multi-channel delay balancing method thereof.
Background
In a mobile communication system, a relatively common scheme is to use a base station radio frequency signal as an information source, and use relay equipment to expand coverage of a wireless signal, so as to improve the investment cost performance of the whole network coverage system. The relay coverage system often uses a multi-channel technology to improve the perception of users and the utilization rate of frequency bands. Specifically, in a mobile network, a relay system generally has signal processing processes such as photoelectric conversion, digital-to-analog conversion, optical fiber transmission, radio frequency filtering, radio frequency amplification and the like, so that different channels have different time delays. The conventional scheme is that the same optical cable is adopted in the relay system, the lengths of the feeder lines are the same, and the time delay of different channels is ensured to be within a required range by improving the consistency of devices. The cost of such a solution is high and sometimes it is difficult to meet some highly demanding scenarios. Therefore, a need exists for an improved solution.
Disclosure of Invention
The invention aims to balance the time delay of a multi-channel relay coverage system.
Therefore, in a first aspect of the present invention, a multi-channel delay balancing method for a relay coverage system is provided, which includes an initialization step and an adjustment step; the initialization step includes: detecting the time delay value of each channel of the relay coverage system; the adjusting step includes: s13, selecting the maximum time delay value as the reference time delay according to the time delay values of all the channels; s15, calculating the difference value of other channels of the relay coverage system relative to the reference time delay; and S17, if the difference value of a certain channel is greater than a preset threshold value, performing time delay offset on the time delay of the channel, so that the difference value between the time delay offset of the channel and the reference time delay does not exceed the preset threshold value.
In an embodiment of the present invention, in the initializing step, the same delay detection module is used to detect the delay values of the channels of the relay coverage system.
In an embodiment of the present invention, in step S17, the delay of each channel is offset by the delay adjustment module connected in series to the channel.
In an embodiment of the present invention, in the initializing step, the delay value of each channel includes a sum of the following delays: time delay of electro-optical conversion, time delay of optical cable transmission, time delay of photoelectric conversion and time delay of power amplification.
In one embodiment of the present invention, in step S17, the preset threshold is 30 nanoseconds.
In a second aspect of the present invention, a relay overlay system is provided, which includes a plurality of channels, each channel including at least an electro-optical conversion module, an optical transmission medium, a photoelectric conversion module, and a power amplification module, which are connected in sequence; further comprising: the time delay detection module is used for detecting time delay values of all channels of the relay coverage system; the time delay adjusting module is connected with each channel in series and is used for carrying out time delay offset on the time delay of the channel; and the control module is connected with the time delay detection module and the time delay adjustment module and is used for: selecting the maximum time delay value as the reference time delay according to the time delay values of all the channels; calculating the difference value of other channels of the relay coverage system relative to the reference time delay; if the difference value of a certain channel is larger than a preset threshold value, performing time delay offset on the time delay of the channel through the time delay adjusting module, so that the difference value between the time delay offset of the channel and the reference time delay does not exceed the preset threshold value.
In one embodiment of the invention, the plurality of channels are connected to the same delay detection module.
In one embodiment of the invention, the time delay adjusting modules connected in series in each channel are connected to the same control module.
In one embodiment of the present invention, the preset threshold is 30 nanoseconds.
The invention can control the time delay difference value of multiple channels of the relay coverage system in a very small range, such as 30ns. And the negative influence of user service perception caused by overlarge delay difference is reduced to the maximum extent.
Drawings
Fig. 1 is a schematic diagram of a relay coverage system according to an embodiment of the present invention;
fig. 2 is a functional block diagram of a first channel of the relay overlay system shown in fig. 1;
FIG. 3 is a block diagram of a framework for performing latency detection as employed by an embodiment of the present invention;
FIG. 4 is a block diagram of a framework for performing latency adjustment as employed by an embodiment of the present invention;
fig. 5 is a flowchart of a multi-channel delay balancing method of the relay coverage system shown in fig. 1.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, in an embodiment of the present invention, a relay coverage system 100 is provided for relaying a base station 10 to cover a mobile terminal 20 at a remote location. The relay overlay system 100 includes a plurality of channels, such as a first channel 13, a second channel 23, \8230;, and an nth channel 33, where n is an integer no less than 2; preferably, n is not less than 2 and not more than 8.
The relay coverage system 100 further has a delay detection module 50, and the delay detection module 50 is connected to each channel of the relay coverage system 100 for detecting a delay value of each channel.
The relay coverage system 100 further has a plurality of delay adjusting modules, and each delay adjusting module is connected in series with a corresponding channel, and is configured to perform delay offset on the delay of the channel. For example, the first channel 13 is connected in series with the first delay adjusting module 11, the second channel 23 is connected in series with the second delay adjusting module 21, and the nth channel 33 is connected in series with the nth delay adjusting module 31.
The relay coverage system 100 further has a control module 60, wherein the control module 60 is connected to the delay detection module 50, and is connected to each delay adjustment module, and is configured to select a maximum delay value as a reference delay according to the delay value of each channel; calculating the difference value of other channels of the relay coverage system 100 relative to the reference time delay; if the difference value of a certain channel is greater than the preset threshold value, the time delay of the channel is subjected to time delay offset through the time delay adjusting module, so that the difference value of the time delay offset of the channel and the reference time delay does not exceed the preset threshold value.
Referring to fig. 2, each channel includes at least an electro-optical conversion module, an optical transmission medium, a photoelectric conversion module, and a power amplification module, which are connected in sequence. For example, the first channel 13 includes an electro-optical conversion module 14, a photoelectric conversion module 16, a power amplification module 18, and the like, and an optical cable is provided between the electro-optical conversion module 14 and the photoelectric conversion module 16 as an optical transmission medium. Similar configurations exist for the other channels and are not described in detail.
At system initialization, the delay detection module 50 detects the delay of each channel, which is the delay when the channel is not delay biased. For example, at initialization, the delay of the first channel 13 that is not delay biased is t1, the delay of the second channel 23 that is not delay biased is t2, and so on.
Fig. 3 is a block diagram of a framework for performing latency detection according to an embodiment of the present invention. The main principle is that the FPGA module of the first digital board (e.g. located in the near-end unit AU) sends a pulse to the FPGA module of the second digital board (e.g. located in the far-end unit), so that the time delay of the optical fiber transmission can be acquired.
Fig. 4 is a block diagram illustrating a method for performing latency adjustment according to an embodiment of the present invention. As shown in fig. 4, the delay adjusting apparatus according to the embodiment of the present invention includes an attenuator connected to the source base station through the coupler through port, a first duplexer connected to the attenuator, a second duplexer connected to the antenna, an uplink signal processing module and a downlink signal processing module connected to the first duplexer and the second duplexer, a controller connected to the uplink signal processing module and the downlink signal processing module, and a memory connected to the controller.
The attenuator is used for receiving the downlink signal through the coupler through port, attenuating the downlink signal and then sending the attenuated downlink signal to the first duplexer; and receiving the uplink signal sent by the first duplexer, and sending the uplink signal to the coupler after the uplink signal is subjected to attenuation processing.
The first duplexer is used for receiving the downlink signal and then sending the downlink signal to the downlink signal processing module; and receiving the uplink signal sent by the uplink signal processing module and then sending the uplink signal to the attenuator.
The second duplexer is used for receiving the downlink signal sent by the downlink signal processing module and then sending the downlink signal to the antenna; and receiving the uplink signal sent by the antenna and then sending the uplink signal to the uplink signal processing module.
The downlink signal processing module is used for receiving the downlink signal, preprocessing the downlink signal, sending the preprocessed downlink signal to the controller for time delay processing, subsequently processing the downlink signal after time delay processing, and sending the processed downlink signal to the second duplexer.
The uplink signal processing module is used for receiving the uplink signal, preprocessing the uplink signal, sending the preprocessed uplink signal to the controller for delay processing, and sending the delayed uplink signal to the first duplexer after subsequent processing.
The memory stores a delay target value T0 sent by the controller, and a downlink signal and an uplink signal sent by the temporary controller.
The controller receives a delay target value T0 sent by a near-end machine (AU), subtracts a self-processing delay value Ta of a delay adjusting device from the delay target value T0 to obtain a delay adjusting value Tb, sends a downlink signal preprocessed by a downlink signal processing module to a memory for temporary storage, and sends an uplink signal preprocessed by an uplink signal processing module to the memory for temporary storage; after the time delay Tb, the preprocessed downlink signals are sent to the downlink signal processing module, and the preprocessed uplink signals are sent to the uplink signal processing module.
In this embodiment, the downlink signal processing module includes a first down-conversion module connected to the first duplexer, a first a/D conversion module connected to the first down-conversion module and the controller, a second D/a conversion module connected to the controller, a second up-conversion module connected to the second D/a conversion module, and a power amplification module connected to the second up-conversion module and the second duplexer.
Specifically, the first down-conversion module performs down-conversion processing on the downlink signal and then sends the downlink signal to the first a/D conversion module; the first A/D conversion module performs analog-to-digital conversion on the downlink signal subjected to the down-conversion processing and then sends the downlink signal to the controller; the controller sends the downlink signals after down-conversion processing and analog-to-digital conversion processing to the memory for temporary storage, and sends the downlink signals to the second D/A conversion module after time delay Tb; the second D/A conversion module performs digital-to-analog conversion on the delayed downlink signal and then sends the delayed downlink signal to the second up-conversion module; the second up-conversion module performs up-conversion processing on the downlink signal after the digital-to-analog conversion processing, and then sends the downlink signal to the power amplifier amplification module; and the power amplifier amplification module performs power amplifier amplification on the downlink signal after the up-conversion processing and then sends the downlink signal to the second duplexer. Finally, the downlink signal is sent to the antenna through the second duplexer.
In this embodiment, the uplink signal processing module includes a first up-conversion module connected to the first duplexer, a first D/a conversion module connected to the first up-conversion module and the controller, a second a/D conversion module connected to the controller, a second down-conversion module connected to the second a/D conversion module, and a low-noise amplification module connected to the second down-conversion module and the second duplexer.
Specifically, the low-noise amplification module is configured to perform low-noise amplification processing on the uplink signal and send the uplink signal to the second down-conversion module; the second down-conversion module is used for sending the uplink signal subjected to the low-noise amplification to the controller after down-conversion processing; the controller sends the uplink signal after low-noise amplification processing and down-conversion processing to a memory for temporary storage, and sends the uplink signal to the first D/A conversion module after time delay Tb; the first D/A conversion module is used for performing digital-to-analog conversion processing on the uplink signal after the time delay processing and then sending the uplink signal to the first up-conversion module; the first up-conversion module is used for sending the up-converted uplink signal to the first duplexer after up-conversion processing. And the first duplexer transmits the uplink signal to an attenuator for attenuation processing, and then transmits the uplink signal to the information source base station through the coupler.
The flow of the multi-channel delay balancing method of the relay overlay system 100 is described with reference to fig. 5. As shown in fig. 5, the multi-channel delay balancing method includes an initialization step S11 and adjustment steps S13 to S17. Wherein the initializing step S11 includes: and detecting the time delay value of each channel of the relay coverage system. The delay is the delay at which the channel is not delay biased. For example, the delay of the first channel 13 that is not delay biased is t1, the delay of the second channel 23 that is not delay biased is t2, and so on.
In the adjusting step, the method specifically comprises the following steps:
s13, selecting the maximum time delay value as a reference time delay according to the time delay values of all the channels;
s15, calculating the difference value of other channels of the relay coverage system relative to the reference time delay;
and S17, if the difference value of a certain channel is greater than a preset threshold (for example, 30 nanoseconds), performing time delay offset on the time delay of the channel, so that the difference value between the time delay offset by the time delay of the channel and the reference time delay does not exceed the preset threshold.
In this embodiment, in the initialization step, the same delay detection module is used to detect the delay values of each channel of the relay coverage system. The delay value for each channel comprises the sum of the following delays: time delay of electro-optical conversion, time delay of optical cable transmission, time delay of photoelectric conversion and time delay of power amplification.
In step S17, the delay adjustment module connected in series to each channel performs delay offset on the delay of the channel.
The above examples merely represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make several variations and modifications, such as combinations of different features in the various embodiments, without departing from the inventive concept, which fall within the scope of the present invention.
Claims (9)
1. A multi-channel time delay balancing method of a relay coverage system is characterized by comprising an initialization step and an adjustment step; the initialization step includes: detecting the time delay value of each channel of the relay coverage system; the adjusting step includes:
s13, selecting the maximum time delay value as the reference time delay according to the time delay values of all the channels;
s15, calculating the difference value of other channels of the relay coverage system relative to the reference time delay;
and S17, if the difference value of a certain channel is greater than a preset threshold value, performing time delay offset on the time delay of the channel, so that the difference value between the time delay offset of the channel and the reference time delay does not exceed the preset threshold value.
2. The multi-channel delay balancing method of the relay overlay system as claimed in claim 1, wherein the initialization step detects the delay values of the channels of the relay overlay system through the same delay detection module.
3. The multi-channel delay balancing method of the relay overlay system according to claim 1, wherein in step S17, the delay of each channel is offset by the delay adjustment module connected in series to the channel.
4. The multi-channel delay balancing method of a relay overlay system according to claim 1, wherein in the initializing step, the delay value of each channel comprises a sum of: time delay of electro-optical conversion, time delay of optical cable transmission, time delay of photoelectric conversion and time delay of power amplification.
5. The multi-channel delay balancing method of a relay overlay system according to claim 1, wherein the preset threshold is 30ns in step S17.
6. A relay coverage system comprises a plurality of channels, wherein each channel at least comprises an electro-optical conversion module, an optical transmission medium, a photoelectric conversion module and a power amplification module which are connected in sequence; it is characterized by also comprising:
the time delay detection module is used for detecting time delay values of all channels of the relay coverage system;
the time delay adjusting module is connected with each channel in series and used for carrying out time delay offset on the time delay of the channel;
the control module is connected with the time delay detection module and the time delay adjustment module and is used for: selecting the maximum time delay value as the reference time delay according to the time delay values of all the channels; calculating the difference value of other channels of the relay coverage system relative to the reference time delay; if the difference value of a certain channel is greater than a preset threshold value, the time delay of the channel is subjected to time delay offset through the time delay adjusting module, so that the difference value between the time delay offset of the channel and the reference time delay does not exceed the preset threshold value.
7. The relay overlay system of claim 6, wherein the plurality of channels are connected to the same delay detection module.
8. The relay overlay system of claim 6 wherein the series of delay adjustment modules for each channel are connected to the same control module.
9. The relay coverage system of claim 6, wherein the preset threshold is 30 nanoseconds.
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| CN102740314A (en) * | 2011-04-06 | 2012-10-17 | 上海华为技术有限公司 | Receiving channel delay correction method, device and base station with device |
| CN103618572A (en) * | 2013-12-10 | 2014-03-05 | 武汉虹信通信技术有限责任公司 | Time delay dynamic regulation method for tree structure covered with depth signals |
| CN104618042A (en) * | 2015-03-10 | 2015-05-13 | 上海创远仪器技术股份有限公司 | System and method for realizing multi-channel signal analysis synchronization and time delay adjustment |
| CN114430563A (en) * | 2022-04-06 | 2022-05-03 | 深圳国人无线通信有限公司 | Method, device and system for eliminating signal interference of overlapping coverage area |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740314A (en) * | 2011-04-06 | 2012-10-17 | 上海华为技术有限公司 | Receiving channel delay correction method, device and base station with device |
| CN103618572A (en) * | 2013-12-10 | 2014-03-05 | 武汉虹信通信技术有限责任公司 | Time delay dynamic regulation method for tree structure covered with depth signals |
| CN104618042A (en) * | 2015-03-10 | 2015-05-13 | 上海创远仪器技术股份有限公司 | System and method for realizing multi-channel signal analysis synchronization and time delay adjustment |
| CN114430563A (en) * | 2022-04-06 | 2022-05-03 | 深圳国人无线通信有限公司 | Method, device and system for eliminating signal interference of overlapping coverage area |
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