Full duplex extender in full duplex network
阅读说明:本技术 全双工网络中的全双工扩展器 (Full duplex extender in full duplex network ) 是由 戴维·B·鲍勒尔 克拉克·V·格林 艾哈姆·Al-班纳 于 2018-12-18 设计创作,主要内容包括:在一个实施例中,一种方法在相同频带中接收下游信号和上游信号。下游信号和上游信号被分离成第一路径和第二路径。使用第一路径的下游信号和使用第二路径的上游信号在模拟域中被放大。该方法将下游信号和上游信号彼此隔离,并将下游信号在下游发送给订户设备,并将上游信号向全双工节点发送。(In one embodiment, a method receives a downstream signal and an upstream signal in the same frequency band. The downstream signal and the upstream signal are separated into a first path and a second path. Downstream signals using the first path and upstream signals using the second path are amplified in the analog domain. The method isolates the downstream signal and the upstream signal from each other and transmits the downstream signal downstream to the subscriber device and transmits the upstream signal towards the full duplex node.)
1. A method, comprising:
receiving, by a computing device, a downstream signal and an upstream signal in a same frequency band;
separating, by the computing device, the downstream signal and the upstream signal into a first path and a second path;
amplifying, by the computing device, the downstream signal using the first path and the upstream signal using the second path;
isolating, by the computing device, the downstream signal and the upstream signal from each other;
transmitting, by the computing device, the downstream signal downstream to a subscriber device; and
transmitting, by the computing device, the upstream signal to a full-duplex node.
2. The method of claim 1, wherein,
receiving the downstream signal and the upstream signal during the same time slot.
3. The method of claim 2, wherein,
in the same time slot, the subscriber device is in a receive mode and another subscriber device that transmits the upstream signal is in a transmit mode.
4. The method of claim 1, wherein,
receiving the downstream signal and the upstream signal in different time slots.
5. The method of claim 4, wherein,
the subscriber device is in a receive mode in a first one of the different time slots and another subscriber device transmitting the upstream signal is in a transmit mode in a second one of the different time slots.
6. The method of claim 1, wherein isolating the downstream signal and the upstream signal comprises:
crosstalk is cancelled from any one of the downstream signal and the upstream signal.
7. The method of claim 1, wherein isolating the downstream signal and the upstream signal comprises:
converting the downstream signal or the upstream signal from analog to digital; and
converting the downstream signal or the upstream signal from digital to analog.
8. The method of claim 7, wherein amplifying the downstream signal or the upstream signal comprises:
performing one or more of the following operations:
amplifying the downstream signal or the upstream signal before converting the downstream signal or the upstream signal from analog to digital; and the number of the first and second groups,
amplifying the downstream signal or the upstream signal after converting the downstream signal or the upstream signal from digital to analog.
9. The method of claim 7, wherein,
converting the downstream signal or the upstream signal from analog to digital and from digital to analog isolates a receiver side that receives the downstream signal or the upstream signal from a transmitter side that transmits the downstream signal or the upstream signal.
10. The method of claim 7, further comprising:
decoding the downstream signal or the upstream signal after converting the downstream signal or the upstream signal from analog to digital; and
after decoding, the downstream signal or the upstream signal is reconstructed.
11. The method of claim 7, wherein isolating the downstream signal and the upstream signal comprises:
crosstalk is cancelled from any one of the downstream signal and the upstream signal after converting the downstream signal or the upstream signal from analog to digital.
12. The method of claim 7, wherein isolating the downstream signal and the upstream signal comprises:
crosstalk is cancelled from either the downstream signal or the upstream signal prior to converting the downstream signal or the upstream signal from analog to digital.
13. The method of claim 1, wherein amplifying the downstream signal using the first path and amplifying the upstream signal using the second path comprises:
coupling the downstream signal to a first amplifier to amplify the downstream signal during a first time slot; and
the upstream signal is coupled to a second amplifier to amplify the upstream signal during a second time slot.
14. The method of claim 1, wherein amplifying the downstream signal using the first path and amplifying the upstream signal using the second path comprises:
coupling the downstream signal to an amplifier to amplify the downstream signal during a first time slot; and
coupling the upstream signal to the amplifier to amplify the upstream signal during a second time slot.
15. An apparatus, comprising:
one or more couplers configured to: receiving a downstream signal and an upstream signal in the same frequency band and coupling the downstream signal in a first path and the upstream signal in a second path;
one or more amplifiers configured to: amplifying the downstream signal using the first path and amplifying the upstream signal using the second path; and
isolation logic configured to: isolating the downstream signal and the upstream signal from each other,
wherein the one or more couplers are configured to: the downstream signal is transmitted downstream to a subscriber device and the upstream signal is transmitted to a full-duplex node.
16. The apparatus of claim 15, further comprising:
a first analog-to-digital converter configured to convert the downstream signal or the upstream signal from analog to digital; and
a second analog-to-digital converter configured to convert the downstream signal or the upstream signal from digital to analog.
17. The apparatus of claim 16, wherein,
the isolation logic is configured to: crosstalk is cancelled from any one of the downstream signal and the upstream signal after the first analog-to-digital converter converts the downstream signal or the upstream signal from analog to digital.
18. The apparatus of claim 15, further comprising:
a first amplifier for amplifying the downstream signal during a first time slot; and
a second amplifier for amplifying the upstream signal during a second time slot.
19. The apparatus of claim 15, further comprising:
an amplifier for amplifying the downstream signal during a first time slot and the upstream signal during a second time slot.
20. An apparatus, comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium comprising instructions that, when executed, control the one or more computer processors to be configured for:
receiving a downstream signal and an upstream signal in the same frequency band;
splitting the downstream signal and the upstream signal into a first path and a second path;
amplifying the downstream signal using the first path and amplifying the upstream signal using the second path;
isolating the downstream signal and the upstream signal from each other;
transmitting the downstream signal downstream to a subscriber device; and
transmitting the upstream signal to a full-duplex node.
Background
Full duplex communications, such as the Full Duplex (FDX) Data Over Cable Service Interface Specification (DOCSIS), are a type of data delivery system in which both downstream and upstream traffic are transmitted in the same frequency band. For example, downstream traffic may be transmitted from the head end to the FDX node, which then transmits the traffic to the downstream located subscriber devices. Upstream traffic is transmitted from the subscriber devices to the headend through the FDX node in the same frequency band as downstream traffic.
To carry full duplex traffic, the network is converted to an N +0 architecture, which means that the amplifiers in the network are removed and replaced by FDX nodes. The FDX transmission replaces the amplifier because it is not compatible with a conventional analog amplifier. For example, conventional analog amplifiers use duplex filters to provide isolation between the upstream amplification path and the downstream amplification path. The duplex filter prevents the amplifier from oscillating, but the use of the duplex filter only works because the upstream and downstream communications occur in different frequency bands. Thus, when upstream and downstream traffic is carried in the same frequency band, conventional analog amplifiers will not be usable.
Converting the amplifier to an FDX node to use the N +0 architecture may significantly increase the cost and timeline required to deploy the network to use full duplex transmission. The cost is increased because the FDX node uses fiber connections from the head end to the node, and the replaced amplifier is connected via coaxial cable rather than via fiber. When the FDX node replaces a conventional analog amplifier, the provider needs to replace the coaxial cable with an optical fiber, which not only increases the cost, but also takes time to replace the coaxial cable with an optical fiber.
Disclosure of Invention
Drawings
Fig. 1 depicts a simplified system for amplifying a full-duplex signal according to some embodiments.
Fig. 2 depicts a more detailed example of a system according to some embodiments.
Fig. 3 depicts an example of an FDX regenerator in accordance with some embodiments.
Fig. 4 depicts an example of an FDX repeater in accordance with some embodiments.
Fig. 5A depicts an example of an FDX dual-switch amplifier according to some embodiments.
Fig. 5B depicts an example of an FDX bidirectional switching amplifier according to some embodiments.
Fig. 6 depicts a simplified flow diagram of a method for processing full-duplex signals according to some embodiments.
FIG. 7 illustrates an example of a special-purpose computer system configured with an FDX extender, according to one embodiment.
Detailed Description
Described herein are techniques for a full duplex communication system. In the following description, for purposes of explanation, numerous examples and specific details are set forth in order to provide a thorough understanding of some embodiments. Some embodiments defined by the claims may include some or all of the features of these examples alone or in combination with other features described below, and may further include modifications and equivalents of the features and concepts described herein.
Some embodiments provide a Full Duplex (FDX) spreader for amplifying a full duplex signal. Full duplex signals carry upstream and downstream traffic in the same frequency band. FDX extenders can be used for analog amplification in full duplex networks. The FDX expander may receive a downstream signal and an upstream signal in the same frequency band, wherein the downstream signal is received from a Full Duplex (FDX) node and the upstream signal is from a subscriber device. The FDX expander then separates the downstream signal and the upstream signal into separate paths. The downstream signal is amplified using a first path and the upstream signal is amplified using a second path. In some embodiments, the FDX expander isolates the downstream signal from the upstream signal. Different methods for isolating the downstream and upstream signals from each other are understood and will be described in more detail below. After amplification, the FDX expander transmits downstream signals to subscriber devices and upstream signals to the FDX node. The FDX extender allows amplification to be performed in a full duplex network without having to replace the amplifier with an FDX node. For example, an analog connection (such as via a coaxial cable connection) from the FDX node to the FDX extender may be maintained in a full duplex system while continuing to provide amplification functionality.
Overview of the System
Fig. 1 depicts a
Full-duplex signals may include different types of traffic, such as data and video. In the downstream direction, signals from the head end are transmitted through the
In the downstream direction,
The
In some embodiments,
Fig. 2 depicts a more detailed example of the
The
In the upstream direction, the directional coupler 208 receives the analog upstream signal and couples the signal to an amplifier 210, the amplifier 210 amplifying the upstream signal. The analog-to-digital converter 212 then converts the analog signal to digital. The digital upstream signal may then be transmitted to the head-end. Although such full duplex logic is described, it should be understood that other variations of full duplex circuitry may be appreciated.
In some embodiments, the
In one path, the
The FDX regenerator 104-1, FDX repeater 104-2, and FDX switching amplifier 104-3 provide amplification of downstream and upstream signals while providing isolation. The FDX regenerator 104-1 and the FDX repeater 104-2 may isolate the downstream and upstream signals and amplify the downstream and upstream signals simultaneously. However, the FDX switching amplifier 104-3 may amplify downstream and upstream signals transmitted in a Time Division Duplex (TDD) manner. That is, at some time,
In a network, an interference group is created when a modem in the network is transmitting, other modems see the transmission and treat the transmission as noise interference. The magnitude of the interference varies based on the transmission power of the modems and the isolation between each modem pair. For some modem pairs, this interference level will severely limit the downstream received signal-to-noise ratio (SNR) of the victim modem (e.g., the modem receiving the interference). In this case, the modem pair would be assigned to the same interference group and not allowed to transmit and receive simultaneously. Since a single modem may limit the received SNR for many modems, all of the modems are assigned to the same interference group. Typically, these interference groups are located in close proximity to each other and have relatively few isolated network elements. In this example, where the modems in the interference group are restricted to transmitting at different times, the FDX switching amplifier 104-3 may be used without losing any of the full duplex functionality of the network. That is, the FDX switch amplifier 104-3 may never handle full duplex traffic simultaneously and thus may be used without any negative restrictions on receiving and transmitting full duplex traffic in both the upstream and downstream directions.
In some examples, network analysis may be used to determine which type of FDX extender to use. For example, FDX regenerator 104-1 may be used in locations in a network that are coupled to a large number of
Now, the different types of
FDX regenerator 104-1
FIG. 3 depicts an example of an FDX regenerator 104-1 according to some embodiments. While such a configuration of the
The FDX regenerator 104-1 includes two interfaces referred to as an
FDX regenerator 104-1 includes a downstream path and an upstream path. In the downstream direction,
After amplification, analog-to-
The decoder/
The
In the upstream direction,
FDX regenerator 104-1 may also isolate the downstream path from the upstream path by canceling crosstalk. For example,
Crosstalk cancellation may be performed in the digital or analog domain. That is,
FDX repeater 104-2
Fig. 4 depicts an example of an FDX repeater 104-2 according to some embodiments. In this example, the upstream path and the downstream path include the same functional elements. One difference between FDX repeater 104-2 and FDX regenerator 104-1 is that the digitized signal is not fully deconstructed and reconstructed in FDX repeater 104-2. Rather, the digitized signal includes digital codewords for the entire spectrum, rather than individual codewords as described with respect to FDX regenerator 104-1. The digitized signal may be included in the original spectrum in a digital format and represents the power of the entire spectrum.
Similar to FDX regenerator 104-1, FDX repeater 104-2 includes a network-side interface and a subscriber-side interface, which are illustrated as FDX modem function 400 and FDX
After amplification, analog-to-
The
In the upstream direction, the
The FDX repeater 104-2 may also isolate the downstream path from the upstream path by canceling crosstalk. For example, the
In FDX repeater 104-2 and FDX regenerator 104-1, cancellation may be performed in the analog domain, the digital domain, or partially in the analog domain to reduce the magnitude of crosstalk with respect to the message signal, and then further cancellation may be performed in the digital domain.
FDX switching amplifier 104-3
Fig. 5A and 5B depict different examples of FDX switching amplifier 104-3 according to some embodiments. Fig. 5A includes separate upstream and downstream amplifiers, and fig. 5B includes a single amplifier that switches between two directions. The FDX dual switching amplifier 104-3 may operate in a Time Division Duplex (TDD) mode. In this example, the upstream and downstream signals are not processed simultaneously. Thus, the FDX dual switch amplifier 104-3 may be placed at the end of the network and coupled to the
Fig. 5A depicts an example of an FDX dual-switch amplifier 104-3 according to some embodiments. Modem/controller 512 may control switches 504 and 508 to couple upstream signals to the upstream path and to couple downstream signals to the downstream path. For example, the modem/controller 512 controls the switches 504 and 508 based on whether the
In the downstream direction, FDX dual-switch amplifier 104-3 may receive the downstream signal at directional coupler 502. The directional coupler 502 may then send the downstream signal to a switch 504, such as a Radio Frequency (RF) switch. The modem/controller 512 controls the switch 504 to couple the downstream signal to the downstream amplifier 506, which may then amplify the signal in the analog domain. The downstream signal is then sent to the switch 508. Modem/controller 512 controls switch 508 to connect to the downstream path and couple the downstream signal in the downstream direction to
In the upstream direction, modem/controller 512 controls switch 508 to couple the upstream signal to amplifier 510. Amplifier 510 then amplifies the signal in the analog domain. The modem/controller 512 controls the switch 508 to then couple the upstream signal to the directional coupler 502. The directional coupler 502 then transmits the upstream signal in the upstream direction to the
In the above configuration, two different amplifiers and paths are used to amplify the downstream signal and the upstream signal, respectively. This uses multiple amplifiers, but only two switches, which can simplify the switching logic. In this example, the upstream and downstream paths are isolated by TDD and no crosstalk cancellation or analog-to-digital/digital-to-analog conversion is used.
Fig. 5B depicts an example of an FDX bidirectional switching amplifier 104-3 according to some embodiments. In this embodiment, a single amplifier is used, and the switches are controlled to couple the upstream and downstream signals to the same amplifier 526 through different paths. Portions of the downstream and upstream paths may pass through similar components, such as switches and amplifiers 526. However, the total path taken is different between the downstream path and the upstream path. That is, the downstream path is coupled by a different switching sequence than the upstream path.
The modem/controller 532 controls the switches 522, 524, 528 and 530 in different time slots when the
In the downstream direction, directional coupler 520 may couple the downstream signal to switch 522. Modem/controller 532 controls switch 522 to couple the signal to switch 524. The modem/controller 532 then controls the switch 524 to couple the signal to the amplifier 526. The amplifier 526 may then amplify the signal in the analog domain and couple the signal to the switch 528. Modem/controller 532 controls switch 528 to couple the signal to switch 530, which then sends the signal downstream.
In the upstream direction, modem/controller 532 controls switch 530 to couple the signal to switch 524. From switch 524, modem/controller 532 controls switch 524 to couple the upstream signal to amplifier 526 for amplification. The modem/controller 532 then controls the switch 528 and the switch 522 to send the upstream signal to the directional coupler 520.
Method flow
Fig. 6 depicts a simplified flow diagram 600 of a method for processing full-duplex signals according to some embodiments. At 602, the
At 604,
At 606, the
At 608,
Thus,
System for controlling a power supply
Fig. 7 illustrates an example of a
The
The
The
Some embodiments may be implemented in a non-transitory computer readable storage medium for use by or in connection with an instruction execution system, apparatus, system, or machine. The computer readable storage medium contains instructions for controlling a computer system to perform the methods described by some embodiments. The computer system may include one or more computing devices. When executed by one or more computer processors, the instructions may be configured to perform the content described in some embodiments.
As used in the specification herein and throughout the claims that follow, "a", "an", and "the" include plural references unless the context clearly dictates otherwise. Moreover, as used in the specification herein and throughout the claims that follow, the meaning of "in.
The above description illustrates various embodiments and examples of how aspects of some embodiments may be implemented. The above examples and embodiments should not be deemed to be the only embodiments, but are presented to illustrate the flexibility and advantages of some embodiments as defined by the following claims. Based on the above disclosure and the appended claims, other arrangements, embodiments, implementations and equivalents may be employed without departing from the scope as defined by the claims.
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