专利汇可以提供Compact transceiver architecture for achieving device to device (D2D) communication using uplink and downlink carrier frequencies专利检索,专利查询,专利分析的服务。并且A system and method for device-to-device (D2D) communication is disclosed. A preferred embodiment comprises a frequency synthesizer configured to provide a first carrier frequency and a second carrier frequency, an up-converter coupled to the frequency synthesizer and configured to up-convert a first baseband signal into a cellular uplink signal when receiving the first carrier frequency from the frequency synthesizer, and configured to up-convert the first baseband signal into a first device-to-device signal when receiving the second carrier frequency from the frequency synthesizer, and a down-converter coupled to the frequency synthesizer and configured to down-convert a second device-to-device signal into a second baseband signal when receiving the first carrier frequency from the frequency synthesizer, and configured to down-convert a cellular downlink signal into the second baseband signal when receiving the second carrier frequency from the frequency synthesizer.,下面是Compact transceiver architecture for achieving device to device (D2D) communication using uplink and downlink carrier frequencies专利的具体信息内容。
What is claimed is:
The present invention relates generally to a transceiver architecture for device-to-device (D2D) communication.
In the field of wireless communication, there has been increasing demand for direct device-to-device (D2D) communication. Direct D2D communication refers to a communication mode between a pair of user equipments (UEs) that does not include a base station in a communication path between the UEs. Hence, direct D2D communication differs from traditional cellular communication in that a pair of UEs (e.g., cell phones, etc.) communicate with one another directly, rather than relaying the wireless signal through an intermediate cellular infrastructure (e.g., cell towers, etc.). Direct D2D communication has many practical advantageous over traditional cellular communication. For instance, D2D communication may potentially allow a cellular network to offload a portion of its base station traffic, as well as allow more efficient data transfer to peripheral devices, e.g., printers, cameras, personal computers (PCs), etc. In addition to these and other practical advantages, direct D2D communication may facilitate various proximity based activities and/or functions. For instance, direct D2D communication may allow users to locate nearby friends through proximity based peer identification, as well as allow local businesses to broadcast proximity-based advertisements.
For these and other reasons, direct D2D communication is likely to be adopted in one form or another by future wireless communication standards, such as the Third Generation Partnership Project (3GPP) long term evolution (LTE) Release 12. As such, any design architectures that would reduce the cost of implementing direct D2D signaling in next generation wireless communication devices is desirable.
Technical advantages are generally achieved by preferred embodiments of the present invention which provide systems and methods for D2D communication.
In accordance with an embodiment, an apparatus for direct device-to-device communication may comprise a frequency synthesizer, a transmission circuit, and a reception circuit. The frequency synthesizer may be configured to provide a first carrier frequency and a second carrier frequency. The transmission circuit may comprise the up-converter and may be configured to generate a cellular uplink signal when the up-converter receives the uplink carrier frequency, and may be further configured to generate a first device-to-device signal when the up-converter receives the downlink carrier frequency. The reception circuit may comprise the down-converter and may be configured to receive a second device-to-device signal when the down-converter receives the uplink carrier frequency, and may be further configured to receive a cellular downlink signal when the down-converter receives the downlink carrier frequency.
In accordance with yet another embodiment, an apparatus may comprise a frequency synthesizer, an up-converter coupled to the frequency synthesizer, and a down-converter coupled to the frequency synthesizer. The frequency synthesizer may be configured to provide a first carrier frequency and a second carrier frequency. The up-converter may be configured to up-convert a first baseband signal into a cellular uplink signal when receiving the first carrier frequency from the frequency synthesizer, and may be further configured to up-convert the first baseband signal into a first device-to-device signal when receiving the second carrier frequency from the frequency synthesizer. The down-converter may be configured to down-convert a second device-to-device signal into a second baseband signal when receiving the first carrier frequency from the frequency synthesizer, and may be further configured to down-convert a cellular downlink signal into the second baseband signal when receiving the second carrier frequency from the frequency synthesizer.
In accordance with yet another embodiment, a method for device-to-device communication may comprise generating a cellular uplink signal using a serially connected up-converter and power-amplifier during a first time period of a time division multiplexing (TDM) scheme synchronization window. The method may further comprise generating a first device-to-device signal using the serially connected up-converter and power-amplifier during a second time period of the TDM synchronization window. The method may further comprise receiving a cellular downlink signal using a serially connected down-converter and low-noise-amplifier during the first time period of the TDM synchronization window. The method may further comprise receiving a first device-to-device signal using the serially connected down-converter and low-noise-amplifier during the second time period of the TDM synchronization window.
In accordance with yet another embodiment, an apparatus comprising an up-converter coupled to an output port of a baseband processor, a power amplifier connected in series with the up-converter and the output port of the baseband processor, the up-converter positioned between the power amplifier and the baseband processor, and a switch comprising a first port that is coupled in series with the power amplifier, the up-converter, and the output port of the baseband processor.
In accordance with yet another embodiment, an apparatus may comprise a down-converter coupled to an input port of a baseband processor and a low-noise amplifier connected in series with the down-converter and the input port of the baseband processor, where the down-converter is positioned between the low-noise amplifier and the first port of the baseband processor. The apparatus may further comprise a switch comprising a first port connected in series with the low-noise amplifier, the down-converter, and the input port of the baseband processor.
Various embodiments may provide many practical and technical advantages. For instance, the transceiver architecture may re-use certain transceiver components, thereby allowing the transceiver architecture to be smaller/more compact), less costly to manufacture, as well as achieve reduced power consumption through the use of fewer amplifiers. Other advantages of the inventive subject matter disclosed herein will become apparent upon reviewing the detailed description and claims below.
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated. The figures are drawn to clearly illustrate the relevant aspects of the preferred embodiments and are not necessarily drawn to scale.
The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
The present invention will be described with respect to preferred embodiments in a specific context, namely a remediation process for wireless nodes. The invention may also be applied, however, to other remediation processes and recovery of validation failure events.
One interesting aspect of direct D2D communications is how much control will be retained by the cellular providers. Although direct D2D communication could theoretically occur without facilitation by the cellular service providers, cellular operators may generally desire to monitor and/or control various aspects of direct D2D communications for purposes of billing and accounting, management of carrier frequencies and interference, and overall management of network traffic to optimize available bandwidths. One technique for accomplishing this is to establish cellular links (i.e., links between the UEs and a wireless base station) in addition to the D2D links (i.e., the links extending between the pair of UEs).
Additionally, one or both of the UEs 110, 120 may establish a cellular uplink (Cell_UL) connection with the eNB 105, thereby allowing the wireless service provider to monitor various aspects of the direct D2D communication. Likewise, the eNB 105 may establish a cellular downlink (Cell_DL) connection with one or both of the UEs 110-120, thereby allowing the wireless service provider to control various aspects of the direct D2D communication.
As such, the D2D communication may include 4 links/connections: the D2D—12 connection, the D2D—21 connection, the Cell_UL connection, and the Cell_DL connection. The Cell_UL and Cell_DL connections may be frequency division duplexed (FDD) such that the CELL_UL connection uses a cellular uplink carrier frequency (f_UL) and the CELL_DL connection uses a cellular downlink carrier frequency (f_DL). The f_UL and f_DL may be orthogonal such that there is little or no interference between them. The D2D—12 and D2D—21 connections may share carrier frequencies with their cellular counterparts according to a time division multiplexing (TDM) scheme. Specifically, the D2D—12 may share the f_UL with the Cell_UL, while the D2D—21 may share the f_DL with the Cell_DL. The technique of using both FDD and TDM techniques to manage the D2D and cellular signals may be referred to herein as ‘the proposed cellular and D2D operation mode.’ The proposed cellular and D2D operation mode is described in co-pending U.S. Non-Provisional patent application Ser. No. 13/343,554 entitled “System and Method for Device-to-Device Communication Overlaid on a Cellular Network,” filed Jan. 4, 2012, which is incorporated herein by reference as if reproduced in its entirety.
One solution for designing a transceiver architecture that can operate in each of the four modes is to simply expand on the conventional cellular FDD transceiver architecture.
The conventional transceiver architecture 300 may facilitate that transmission of a Cell_UL signal according to the following steps; (1) the BB processor 310 may generate a digital baseband signal, (2) the D/A converter 320 may convert the digital baseband signal into an analog baseband signal, (3) the f_UL up-converter 325 may up-convert the analog baseband signal into a Cell_UL signal; (4) the PA 330 may amplify the Cell_UL signal; (5) the DPLX 340 may isolate the Cell_UL signal from any received signals (such as a Cell_DL signal); and (6) the antenna 350 may convert the Cell_UL signal into an equivalent radio signal, thereby transmitting the Cell_UL signal.
The conventional transceiver architecture 300 may facilitate the reception of a Cell_DL signal according to the following steps: (1) the antenna 350 may receive Cell_DL radio signal, and convert the Cell_DL radio signal into an equivalent electrical signal; (2) the DPLX 340 may isolate the Cell_DL signal from any transmission signals (such as the Cell_UL signal); (3) the LNA 360 may amplify the Cell_DL signal; (4) the f_DL down-converter 365 may down-convert the Cell_DL signal into an analog baseband signal; (5) the LPF 370 may filter the analog baseband signal to remove hi-frequency components (e.g., high frequency noise); (6) the A/D converter 380 may convert the analog baseband signal into a digital baseband signal; and (7) the BB processor 310 may process the digital baseband signal accordingly.
Direct D2D communication functionality (e.g., according to the proposed operation mode discussed above) may be achieved by simply expanding on the conventional transceiver architecture 300.
The conventional transceiver architecture 400 may be capable of transmitting both a Cell_UL signal (at the f_UL) and a D2D—21 signal (at the f_DL) by alternating between the f_UL up-converter 425 and the f_DL up-converter 426 using the switch 490. Likewise, conventional transceiver architecture 400 may be capable of receiving both a Cell_DL signal (at the f_DL) and a D2D—12 signal (at the f_UL) by alternating between the f_DL down-converter 466 and the f_UL up-converter 465 using the switch 493. The switches 491 and 492 may allow the respective cellular and D2D signals to be appropriately routed to the DPLX 440.
Notably, the conventional transceiver architecture 400 must include several additional components to achieve direct D2D communication, including an additional PA, an additional LNA, an additional down-converter, and an additional up-converter. These additional components may significantly increase the complexity of the transceiver, which may increase the cost of bringing the product to market. As such, a less-complex D2D capable transceiver architecture (e.g., including fewer and/or cheaper components) is desirable.
An embodiment of a transceiver architecture for achieves direct D2D functionality using fewer components and/or less-complex circuit architectures. Specifically, the transceiver architecture may efficiently reuse one or more RF components (e.g., PAs, LNAs, up-converters, etc.) when achieving direct D2D functionality. As such, mobile devices that adopt the transceiver architecture may be smaller (e.g., more compact), less expensive, and/or experience reduced power consumption (e.g., through the use of fewer amplifiers).
The up-converter 525 may function somewhat similarly to the f_UL up-converter 325, except that the up-converter 525 may be capable of up-converting a baseband analog signal into multiple different carrier frequencies (e.g., as provided by the frequency synthesizer 595), rather than to just a single carrier frequency. For instance, up-converter 525 may up-convert the baseband analog signal into an f_DL signal (e.g., the D2D—21 signal) when the frequency synthesizer 595 provides an f_DL, or to an f_UL signal (e.g., Cell_UL signal) when the frequency synthesizer 595 provides an f_UL. Likewise, the down-converter 565 may function somewhat similarly to the f_DL down-converter 365, except that the down-converter 565 may be capable of down-converting different carrier frequencies to the baseband signal (e.g., pursuant to a signal provided by the frequency synthesizer 595). For instance, down-converter 565 may be configured to down-convert an f_DL carrier signal (e.g., Cell_DL signal) when the frequency synthesizer 595 provides an f_DL, or to down-convert an f_UL carrier signal (e.g., D2D—12 signal) when the frequency synthesizer 595 provides an f_UL.
The switch 590 may be similar to the switch 490, except that the switch 590 may be a four way switch. The frequency synthesizer 595 may be any component configured to generate or otherwise provide corresponding carrier frequencies to the up-converter 525 and/or the down-converter 565. In an embodiment, the switch 590 and the frequency synthesizer 595 may provide TDM functionality, thereby facilitating the implementation of the proposed cellular and D2D operation mode. For instance, the frequency synthesizer 595 may provide the f_UL signal to the up-converter 525 during a first timeslot (T1) in a TDM window and to the down-converter 565 at a second timeslot (T2) in the TDM window. Likewise, the frequency synthesizer 595 may provide the f_DL signal to the up-converter 525 during T2 and to the down-converter 565 at a T1. The switch 590 may be configured to ensure that the D2D—21 signal received from the PA 530 is output on the link 592, and that the Cell_UL signal received from the PA 530 is output on the link 591. Likewise, the switch 590 may be configured to ensure that the Cell_DL and D2D—12 signals received from the DPLX 540 are forwarded to the LNA 560. This concept is better described by
The DPLXs 840 and 841 may be similar to the DPLX 540, except that each of the DPLXs 840 and 841 may support specific transmission (TX) and reception (RX) frequency bands. For instance, the DPLX 840 may support a TX frequency band corresponding to f_UL and an RX frequency band corresponding to f_DL, while the DPLX 841 may support a TX frequency band corresponding to f_DL and an RX frequency band corresponding to f_UL.
In some commercial implementations, the transceiver architecture 800 may be preferable over the transceiver architecture 500 because the transceiver architecture 800 may include less complex (e.g., less costly) components. For instance, the DPLX 540 may be more complex than the DPLXs 840-841 by virtue of its ability to support different TX and RX filter requirements. In other commercial implementations, the transceiver architecture 500 may be preferable over the transceiver architecture 800 in that it may comprise fewer components and/or a more streamlined/compact design.
As shown in
The concepts illustrated in
Embodiments may be implemented in a relay station as well.
In some applications, it may be preferable to use multiple narrowband PAs rather than a wideband functional PA to reduce cost.
In the same or other applications, it may be preferable to use multiple narrowband LNAs rather than a wideband functional LNA to reduce cost.
Some embodiments may combine various aspects of the above discussed transceiver architectures to meet various design, cost, or performance objectives. For instance, a four-way switch (e.g., similar to the switch 590) combined with a pair of DPLXs (e.g., similar to the DPLXs 840-841).
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. For example, the order of downloaded patches may be adjusted as desired in order to maximize the potential for recovery or to address any security concerns. Additionally, the precise methods by which components may be verified or loads be validated may also vary from the specific embodiments described here while remaining within the scope of the embodiments.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
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