CN110971249B - Wireless transceiver and wireless communication method - Google Patents
Wireless transceiver and wireless communication method Download PDFInfo
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- CN110971249B CN110971249B CN201811148739.1A CN201811148739A CN110971249B CN 110971249 B CN110971249 B CN 110971249B CN 201811148739 A CN201811148739 A CN 201811148739A CN 110971249 B CN110971249 B CN 110971249B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1045—Adjacent-channel interference
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Abstract
The invention discloses a wireless transceiver and a wireless communication method, which can reduce signal interference from an adjacent channel, wherein the difference between the center frequency of the adjacent channel and the center frequency of a target channel is less than a frequency difference threshold and/or the energy of an interference signal of the adjacent channel is greater than a signal energy threshold. The radio frequency transceiver is used for transmitting a first self-transmission permission frame through the adjacent channel before transmitting a data packet through the target channel, wherein the period of the period field of the first self-transmission permission frame covers the time when the radio frequency transceiver finishes transmitting the data packet. The frequency synthesizer is used for providing the carrier wave of the adjacent channel and the carrier wave of the target channel to the radio frequency transceiver. The RF controller is used for controlling the frequency synthesizer to provide the carrier of the adjacent channel and the carrier of the target channel.
Description
Technical Field
The present invention relates to wireless communications, and more particularly, to a wireless transceiver and a wireless communication method capable of reducing signal interference originating from adjacent frequency channels.
Background
When a wtru transmits data packets through a target channel, packet collisions may occur if another wtru simultaneously transmits data packets through the target channel. To avoid packet collisions, different wtrus should adhere to the same Collision Avoidance protocol (e.g., Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA). Under one mechanism of the collision avoidance protocol, a wtru sends a Request To Send (RTS) frame to another wtru (e.g., Access Point (AP)) nearby via the target channel, and after the wtru receives a Clear To Send (CTS) frame from the other wtru via the target channel, the wtru transmits data packets via the target channel, and other wtrus receiving the CTS frame nearby also suspend transmission (e.g., by adjusting a Network Allocation Vector (NAV) value) to avoid packet collision.
In addition, some wireless transceivers (e.g., wireless transceivers conforming to the 802.11b standard only) cannot recognize signals with specific modulation (e.g., Orthogonal frequency-division multiplexing (OFDM) modulation). Therefore, a wireless transceiver (e.g., a wireless transceiver conforming to 802.11g standard) using the specific modulation to transmit data packets can transmit the RTS frame and the CTS frame via a target channel before transmitting data packets via the target channel to avoid packet collision, or transmit a clear-to-send (CTS-to-Self) frame via the target channel to avoid packet collision, wherein a Receiving Address (RA) of the CTS-to-Self frame is an Address of the wireless transceiver transmitting the CTS-to-Self frame.
However, packet collisions may still occur when two frequency channels (e.g., two adjacent frequency channels in the 2.4GHz band in the 802.11 specification) are simultaneously used for signal transmission and the difference between the center frequencies of the two frequency channels is not large enough, or when the energy of a signal transmitted via one frequency channel is large enough to interfere with a signal transmitted via the other frequency channel. Based on the RTS and CTS mechanisms and the CTS-to-Self mechanism, which both transmit control frames via a target channel to avoid collision, when a wireless transceiver using an adjacent channel (e.g., channel 8 of 2.4GHz band in 802.11 specification) of the target channel (e.g., channel 6 of 2.4GHz band in 802.11 specification) to transmit packets does not receive/cannot identify the CTS frame or CTS-to-Self frame transmitted via the target channel, the wireless transceiver will continue/start transmitting packets via the adjacent channel, thereby causing interference to signal transmission of the target channel.
Disclosure of Invention
An objective of the present invention is to provide a wireless transceiver and a wireless communication method, so as to avoid the problems of the prior art.
The wireless transceiver of the present invention can reduce signal interference originating from an adjacent channel, where a difference between a center frequency of the adjacent channel and a center frequency of a target channel is smaller than a frequency difference threshold and/or an energy of an interference signal of the adjacent channel is larger than a signal energy threshold. The radio frequency transceiver is used for transmitting a first self-transmission permission frame through the adjacent channel before transmitting a data packet through the target channel, wherein the period of the period field of the first self-transmission permission frame covers the time when the radio frequency transceiver finishes transmitting the data packet. The frequency synthesizer is used for providing the carrier wave of the adjacent channel and the carrier wave of the target channel to the radio frequency transceiver. The RF controller is used for controlling the frequency synthesizer to provide the carrier of the adjacent channel and the carrier of the target channel.
The wireless communication method of the present invention can also reduce signal interference originating from a neighboring channel whose center frequency differs from a center frequency of a target channel by less than a frequency difference threshold and/or whose energy of an interference signal is greater than a signal energy threshold, the wireless communication method comprising the following steps: before transmitting a data packet through the target channel, transmitting a first self-transmission-allowed frame through the adjacent channel, wherein the period of the period field of the first self-transmission-allowed frame covers the time when the radio-frequency transceiver finishes transmitting the data packet; and transmitting the data packet through the target channel.
The features, implementations, and technical advantages of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 shows an embodiment of a wireless transceiver according to the present invention;
fig. 2 shows an example of the wtru of fig. 1 transmitting shifted CTS frames to avoid interference;
fig. 3 shows an example of the wtru of fig. 1 transmitting shifted CTS frames and second self-permitted-to-send frames to avoid interference;
fig. 4 shows an example of the wireless transceiver of fig. 1 transmitting a shift CTS frame, transmitting an RTS frame, and receiving a CTS frame to avoid interference;
fig. 5 shows an embodiment of the wireless transceiver of fig. 1 utilizing rf transceiver circuits and frequency synthesizer circuits for transmission;
fig. 6 shows an embodiment of the wtru of fig. 5 simultaneously transmitting a shifted CTS frame and a second self-sustained transmission frame;
fig. 7 shows an embodiment of the wtru of fig. 5 simultaneously sending a translated CTS frame and an RTS frame;
fig. 8 shows another embodiment of the wireless transceiver of the present invention; and
fig. 9 shows an embodiment of a wireless communication method of the present invention.
Description of the symbols
100 wireless transceiver
110 radio frequency transceiver
120 frequency synthesizer
130 radio frequency controller
Shifted-CTS Shift CTS frame (first self-transmission permission frame)
Data packet
Ack acknowledgement frame
Interference signal Interference
CH-1 CH-14 channel 1 channel 14
2th CTS second self-clear to Send frame
RTS request to Send frame
CTS clear to Send frame
112 first radio frequency transceiver circuit
114 second radio frequency transceiver circuit
122 first frequency synthesizing circuit
124 second frequency synthesizing circuit
800 wireless transceiver
810 detection circuit
S910 to S920
Detailed Description
The terms in the following description refer to the conventional terms in the field, and some terms are defined or explained in the specification, and are to be interpreted according to the description or the definition of the specification.
Fig. 1 shows an embodiment of the wireless transceiver of the present invention, and the wireless transceiver 100 of fig. 1 is capable of reducing signal interference originating from a neighboring channel whose center frequency differs from the center frequency of a target channel by less than a frequency difference threshold (e.g., 25MHz) and/or whose energy of an interfering signal is greater than a signal energy threshold, which can be determined by the implementation of the present invention according to the requirements of the implementation. For example, in the 802.11 specification, the difference between the center frequencies of two adjacent channels of the 2.4GHz band is 5MHz, and the adjacent channel and the target channel are the (N + X) th channel and the Nth channel of the 2.4GHz band, wherein N is a positive integer, X is an integer (e.g., -5 ≦ X ≦ 5), and (N + X) is not less than one and not greater than the number of channels of the 2.4GHz band specified by the 802.11 specification (i.e., channel 1, channel 2, …, channel 13, channel 14(CH-1, CH-2, …, CH-13, CH-14)).
Referring to fig. 1, the wireless transceiver 100 includes an rf transceiver 110, a frequency synthesizer 120 and an rf controller 130. Referring to fig. 1 and 2, the rf transceiver 110l is coupled to a baseband circuit (not shown) for transmitting a first Self-clear-to-send (CTS-to-Self) frame (hereinafter referred to as a shifted CTS frame) via the neighboring channel (e.g., CH-8) before transmitting a data packet via the target channel (e.g., CH-6), wherein a period (hereinafter referred to as a first period) of a period field (field of duration) of the shifted CTS frame covers a time when the rf transceiver 110 completes transmitting the data packet, so that at least a portion of a signal Interference (denoted as "Interference" in the figure) of the neighboring channel is delayed until (delayed to) the rf transceiver 110 completes transmitting the data packet; for example, the length of the first period is calculated from the end of the shifted CTS frame, and includes the time length required for the wtru 110 to transmit one or more frames (if any) before the completion of receiving an Acknowledgement (ACK) frame, the time length required for the wtru 110 to transmit the data packet, the time length required for the wtru 110 to receive the ACK frame, the frame Interval (IFS) between frames, and the frame interval between frames and data packets, and the details thereof are omitted herein since the value of the period field is used to indicate the time length is common knowledge in the art. The frequency synthesizer 120 is used to provide the carrier of the adjacent channel (whose frequency is equal to the center frequency of the adjacent channel) and the carrier of the target channel (whose frequency is equal to the center frequency of the target channel) to the rf transceiver 110; thus, the radio frequency transceiver 110 transmits the shifted CTS frame by using the carrier of the adjacent channel and transmits the data packet by using the carrier of the target channel, respectively. The rf controller 130 is used to control the frequency synthesizer 120 to provide the carrier of the adjacent channel and the carrier of the target channel to the rf transceiver 110.
Please refer to fig. 1-2. The radio frequency transceiver 110 reduces signal interference originating from the adjacent channel by transmitting the shifted CTS frame; at this time, if the radio transceiver 110 determines that the target channel has no effective signal interference (e.g., by wireless site survey (PSD) detection techniques described below), the radio transceiver 110 may transmit the data packet directly on the target channel after transmitting the shifted CTS frame via the adjacent channel; if however, the rf transceiver 110 determines that there is significant signal interference on the target channel or that the target channel is Clear, the rf transceiver 110 may transmit a second self-Clear-to-Send (RTS) frame on the target channel (as shown in fig. 3) or transmit a Request-to-Send (CTS) frame and receive a Clear-to-Send (CTS) frame on the target channel (as shown in fig. 4) before transmitting the data packet on the target channel. In one implementation, the radio frequency transceiver 110 first transmits one of the translated CTS frame and the second self-permitted-to-send frame, and then transmits the other; when the radio frequency transceiver 110 is configured to transmit the shifted CTS frame first, the radio frequency controller 130 is configured to control the frequency synthesizer 120 to provide the carrier of the adjacent channel to the radio frequency transceiver 110 first, and then control the frequency synthesizer 120 to provide the carrier of the target channel to the radio frequency transceiver 110, where the first period is longer than the period of the period field of the second self-permitted frame (hereinafter referred to as a second period); when the radio frequency transceiver 110 is used to transmit the second self-permitted-transmission frame first, the radio frequency controller 130 is used to control the frequency synthesizer 120 to provide the carrier of the target channel to the radio frequency transceiver 110 first, then control the frequency synthesizer 120 to provide the carrier of the adjacent channel to the radio frequency transceiver 110, and then control the frequency synthesizer 120 to provide the carrier of the target channel to the radio frequency transceiver 110 to transmit the data packet, where the second period is longer than the first period. In one implementation, the radio frequency transceiver 110 first transmits one of the translational CTS frame and the RTS frame, and then transmits the other; in this case, the operations of the radio frequency transceiver 110, the radio frequency controller 130 and the frequency synthesizer 120 are similar to those of the previous embodiment, and the relationship between the first period and the period of the period field of the RTS frame (hereinafter referred to as RTS period) can be derived from the description of the previous embodiment. In one implementation example, wtru 100 transmits the second self-sustained-transmission frame and one of the RTS frame and the translated CTS frame simultaneously via sets of rf circuits (as shown in fig. 5), as described in detail below.
Please refer to fig. 1. The radio frequency transceiver 110 may include one or more radio frequency transceiver circuits, and the frequency synthesizer 120 may include one or more frequency synthesizer circuits; therefore, the wireless transceiver 100 may operate by using a single rf transceiver circuit and a single frequency synthesizer circuit, or by using multiple rf transceivers and multiple frequency synthesizer circuits. Fig. 5 is a schematic diagram of an embodiment of the wireless transceiver 100 using a plurality of rf transceiving circuits and a plurality of frequency synthesizing circuits for transmission. In fig. 5, the rf transceiver 110 includes a first rf transceiver circuit 112 and a second rf transceiver circuit 114; the frequency synthesizer 120 includes a first frequency synthesizing circuit 122 and a second frequency synthesizing circuit 124. A first RF transceiver circuit 112 for transmitting the shifted CTS frame via the adjacent channel, a second RF transceiver circuit 114 for transmitting the second self-permitted-to-send frame or the RTS frame via the target channel before the first RF transceiver circuit 112 completes transmitting the shifted CTS frame; in one implementation example, the first rf transceiving circuit 112 and the second rf transceiving circuit 114 transmit the first and second self-permitted-to-transmit frames substantially simultaneously (as shown in fig. 6), and thus the first period may be substantially equal to the second period; in one implementation, the first rf transceiving circuit 112 and the second rf transceiving circuit 114 send the translated CTS frame and the RTS frame substantially simultaneously (as shown in fig. 7), and thus the first period may be substantially equal to the RTS period. The first frequency synthesizing circuit 122 is used for providing the carrier of the adjacent channel to one of the first rf transceiving circuit 112 and the second rf transceiving circuit 114, and the second frequency synthesizing circuit 124 is used for providing the carrier of the target channel to the other one of the first rf transceiving circuit 112 and the second rf transceiving circuit 114; in an exemplary embodiment, a multiplexer is disposed between the frequency synthesizer 120 and the rf transceiver 110, and the multiplexer can determine the connection relationship between the plurality of frequency synthesizing circuits of the frequency synthesizer 120 and the plurality of rf transceiving circuits of the rf transceiver 110 under the control of the rf controller 110. One skilled in the art can refer to the applicant's U.S. patent (Pat. No. 8,977,218) to obtain an example of the implementation of the rf transmitting circuit, the frequency synthesizing circuit and the multiplexer.
In the case that the difference between the center frequency of the neighboring channel and the center frequency of the target channel is less than the frequency difference threshold, to determine whether the signal interference originating from the neighboring channel exists, the rf transceiver 110 may determine whether other wireless devices/interferers are utilizing the neighboring channel by attempting to receive a signal (e.g., beacon) of the neighboring channel; when the radio frequency transceiver 110 receives the signal of the adjacent channel, the signal interference of the adjacent channel can be confirmed to exist, at this time, the radio frequency transceiver 110 will transmit the shifted CTS frame to reduce/eliminate the signal interference of the adjacent channel; when the radio frequency transceiver 110 does not receive the signal of the adjacent channel, the signal interference of the adjacent channel can be confirmed to be absent, and at this time, the radio frequency transceiver 110 can transmit the data packet through the target channel without transmitting the shifted CTS frame. Since the attempt to receive a signal of a certain channel can be realized by known techniques (e.g., wireless site survey) or self-developed techniques, the relevant details are omitted here.
To determine whether the energy of an interference signal of the adjacent channel is greater than a signal energy threshold, the present disclosure proposes another embodiment of the wireless transceiver according to the present invention as shown in fig. 8. The wireless transceiver 800 of fig. 8 comprises a detection circuit 810, the detection circuit 810 is configured to detect whether the energy of the interference signal of the adjacent channel is greater than the signal energy threshold, and enable the radio frequency transceiver 110 to transmit the shifted CTS frame through the adjacent channel when the energy of the interference signal is greater than the signal energy threshold; in an implementation example, the detection circuit 810 is a part of a signal processing circuit (not shown) of the wireless transceiver 800. An exemplary implementation of the detection circuit 810 is a Power Spectral Density (PSD) detection circuit, which can be found in our united states patent (Pat. No. 9,572,114) by those skilled in the art.
It is noted that, depending on the capabilities of the wtru and neighboring wtrus and/or the wireless transmission environment of the present invention, the radio frequency transceiver 110 may transmit the shifted CTS frame and the data packet using the same modulation technique (e.g., a non-Orthogonal frequency-division multiplexing (OFDM) modulation technique such as that used by IEEE802.11 b), or may transmit the shifted CTS frame and the data packet using a modulation technique (e.g., a non-OFDM modulation technique such as that used by IEEE802.11 b) and transmit the data packet using another modulation technique (e.g., an OFDM modulation technique); the non-OFDM modulation is, for example, Direct Sequence Spread Spectrum (DSSS) modulation, Differential two Phase Shift Keying (DBPSK) modulation, Differential four Phase Shift Keying (DQPSK) modulation, or Complementary Code Keying (CCK) modulation. It should be noted that the format of the frames depends on the wireless communication standard (e.g., one of the 802.11 standards) adopted by the transceiver of the present invention, and the details thereof are omitted herein.
Fig. 9 shows a flowchart of an embodiment of a wireless communication method of the present invention. The embodiment of fig. 9 can reduce the signal interference from a neighboring channel whose center frequency differs from the center frequency of a target channel by less than a frequency difference threshold and/or whose energy of an interfering signal is greater than a signal energy threshold, which can be determined by the implementation inventor according to his needs, thereby determining which is the neighboring channel. The embodiment of fig. 9 comprises the following steps:
step S910: before transmitting a data packet through the target channel, transmitting a first self-transmission allowed frame through the adjacent channel, wherein the period of the period field of the first self-transmission allowed frame covers the time for completing the transmission of the data packet; and
step S920: transmitting the data packet through the target channel.
Since the implementation details and variations of the embodiments of the method can be understood by those skilled in the art with reference to the disclosure of the foregoing device embodiments, that is, the technical features of the foregoing device embodiments can be reasonably applied to the embodiments of the method, the repeated and redundant description is omitted here without affecting the disclosure requirements and the implementability of the embodiments of the method.
It should be noted that, when the implementation is possible, a person skilled in the art may selectively implement some or all of the technical features of any one of the foregoing embodiments, or selectively implement a combination of some or all of the technical features of the foregoing embodiments, thereby increasing the flexibility in implementing the invention.
In summary, the transceiver and the wireless communication method of the present invention can reduce signal interference from a neighboring channel to increase the success rate of packet transmission.
Although the embodiments of the present invention have been described above, the embodiments are not intended to limit the present invention, and those skilled in the art can make variations on the technical features of the present invention according to the explicit or implicit contents of the present invention, and all such variations may fall within the scope of the patent protection sought by the present invention.
Claims (10)
1. A wireless transceiver capable of reducing signal interference originating from an adjacent channel whose center frequency differs from a center frequency of a target channel by less than a frequency difference threshold and/or whose energy of an interfering signal is greater than a signal energy threshold, the wireless transceiver comprising:
a radio frequency transceiver for transmitting a first self-transmission allowed frame through the adjacent channel before transmitting a data packet through the target channel, wherein the period of the period field of the first self-transmission allowed frame covers the time when the radio frequency transceiver completes transmitting the data packet;
a frequency synthesizer for providing the carrier of the adjacent channel and the carrier of the target channel to the radio frequency transceiver; and
a radio frequency controller for controlling the frequency synthesizer to provide the carrier of the adjacent channel and the carrier of the target channel.
2. The wtru of claim 1 wherein the wtru is configured to transmit a second self-allowed-to-send frame or a requested-to-send frame via the target channel before transmitting the data packet via the target channel.
3. The wtru of claim 2, wherein when the wtru is configured to transmit the second self-allowed transmission frame via the target channel, the wtru is configured to transmit one of the first self-allowed transmission frame and the second self-allowed transmission frame before transmitting the other of the first self-allowed transmission frame and the second self-allowed transmission frame; when the radio frequency transceiver is used for transmitting the first self-permission sending frame, the radio frequency controller is used for controlling the frequency synthesizer to provide the carrier wave of the adjacent channel to the radio frequency transceiver firstly and then controlling the frequency synthesizer to provide the carrier wave of the target channel to the radio frequency transceiver; when the RF transceiver is used to transmit the second self-permitted transmission frame, the RF controller is used to control the frequency synthesizer to provide the carrier of the target channel to the RF transceiver first, and then control the frequency synthesizer to provide the carrier of the adjacent channel to the RF transceiver.
4. The wireless transceiver of claim 2, wherein the rf transceiver comprises:
a first RF transceiver circuit for transmitting the first self-permitted transmission frame through the adjacent channel; and
a second RF transceiving circuit for transmitting the second self-permitted-to-transmit frame or the requested-to-transmit frame via the target channel before the first RF transceiving circuit completes transmitting the first self-permitted-to-transmit frame,
the frequency synthesizer includes:
a first frequency synthesizing circuit for providing the carrier of the adjacent channel to the RF transceiver; and
a second frequency synthesizing circuit for providing the carrier of the target channel to the RF transceiver.
5. The wtru of claim 2 wherein when the wtru is configured to transmit the request-to-send frame via the target channel, the wtru is configured to receive an allowed-to-send frame via the target channel before transmitting the data packet via the target channel.
6. The wireless transceiver of claim 5 wherein the duration of the period field of the first self-permitted-to-transmit frame is longer than the duration of the period field of the requested-to-transmit frame.
7. The wireless transceiver of claim 2 wherein the period of the period field of the first self-permitted transmission frame is longer than the period of the period field of the second self-permitted transmission frame when the rf transceiver is configured to transmit the second self-permitted transmission frame via the target channel.
8. The wtru of claim 1 wherein the radio frequency transceiver receives a signal from the neighboring channel to confirm the existence of signal interference originating from the neighboring channel and then transmits the first self-sustained-transmission frame if the difference between the center frequency of the neighboring channel and the center frequency of the target channel is less than the frequency difference threshold.
9. The wireless transceiver of claim 1, further comprising:
a detection circuit for detecting whether the energy of the interference signal of the adjacent channel is greater than the signal energy threshold, and making the radio frequency transceiver transmit the first self-permitted transmission frame through the adjacent channel when the energy of the interference signal is greater than the signal energy threshold.
10. A wireless communication method capable of reducing signal interference originating from a neighboring channel whose center frequency differs from a center frequency of a target channel by less than a frequency difference threshold and/or whose energy of an interference signal is greater than a signal energy threshold, the wireless communication method comprising the steps of:
before transmitting a data packet through the target channel, transmitting a first self-transmission allowed frame through the adjacent channel, wherein the period of the period field of the first self-transmission allowed frame covers the time for completing the transmission of the data packet; and
transmitting the data packet through the target channel.
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