CN113316179A - Communication device and transmission parameter adjusting method - Google Patents
Communication device and transmission parameter adjusting method Download PDFInfo
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- CN113316179A CN113316179A CN202010119161.8A CN202010119161A CN113316179A CN 113316179 A CN113316179 A CN 113316179A CN 202010119161 A CN202010119161 A CN 202010119161A CN 113316179 A CN113316179 A CN 113316179A
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- 238000004891 communication Methods 0.000 title claims abstract description 57
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- 238000001514 detection method Methods 0.000 claims abstract description 129
- 230000007704 transition Effects 0.000 claims description 18
- 230000002776 aggregation Effects 0.000 claims description 8
- 238000004220 aggregation Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 description 14
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
Abstract
A communication device and a transmission parameter adjusting method are provided. The wireless transceiver is used for transmitting or receiving wireless signals and comprises a collision detection device. The collision detection device is used for detecting the energy in a wireless transmission channel in a first time interval before the wireless transceiver transmits a packet, and correspondingly generating a detection result. The first time interval covers a time interval when the wireless transceiver is converted from a receiving state to a transmitting state. The processor is used for adjusting at least one transmission parameter according to the detection result.
Description
Technical Field
The present invention relates to a collision detection and transmission parameter adjustment mechanism applied in a communication device, and more particularly, to a collision detection method capable of effectively detecting a collision and a transmission parameter adjustment method capable of effectively reducing the occurrence of a collision according to a detection result.
Background
Carrier Sense Multiple Access (CSMA) and Collision Avoidance (CA) are one way to avoid or reduce collisions in a wireless transmission system. However, CSMA and CA cannot completely avoid the impact of collision or interference on the whole transmission, especially in the free channel such as 2GHz/5GHz used by WiFi, since a plurality of different communication systems share the limited bandwidth and cannot detect each other, collision is more likely to occur.
To reduce the occurrence of collisions, efficient detection of collision situations will be a very important issue.
Disclosure of Invention
An objective of the present invention is to provide a collision detection and transmission parameter adjustment mechanism applied in a communication device, so as to solve the problem that the transmission collision cannot be accurately detected in the conventional technology, and effectively adjust the parameters of the subsequent transmission by the detection result that can truly reflect the channel environment.
An embodiment of the present invention provides a communication device, which includes a wireless transceiver and a processor. The wireless transceiver is used for transmitting or receiving wireless signals and comprises a collision detection device. The collision detection device is used for detecting the energy in a wireless transmission channel in a first time interval before the wireless transceiver transmits a packet, and correspondingly generating a detection result. The first time interval covers a time interval when the wireless transceiver is converted from a receiving state to a transmitting state. The processor is used for adjusting at least one transmission parameter according to the detection result.
Another embodiment of the present invention provides a method for adjusting transmission parameters, including: detecting energy in a wireless transmission channel in a first time interval before a communication device transmits a packet, and correspondingly generating a detection result; and adjusting at least one transmission parameter according to the detection result, wherein the first time interval covers a time interval when a wireless transceiver of the communication device is switched from a receiving state to a transmitting state.
By combining the collision detection and transmission parameter adjustment mechanism provided by the invention, the collision can be efficiently detected, and the transmission parameters can be further correctly adjusted according to the detection result, so that the transmission efficiency can be effectively improved.
Drawings
Fig. 1 is a block diagram illustrating an example of a communication device according to a first embodiment of the present invention.
Fig. 2 is a timing chart showing collision detection according to the first embodiment of the present invention.
Fig. 3 is a timing chart showing state transition and collision detection according to the first embodiment of the present invention.
Fig. 4 is a block diagram illustrating an example of a communication device according to a second embodiment of the present invention.
Fig. 5 is a timing chart showing collision detection according to the second embodiment of the present invention.
Fig. 6 is a flowchart illustrating an exemplary method for adjusting transmission parameters according to an embodiment of the invention.
Description of the symbols
100. 400: communication device
110. 410: antenna with a shield
120. 420: collision detection device
130. 430: wireless transceiver
140. 440, a step of: processor with a memory having a plurality of memory cells
450: feedback signal eliminating device
RX: receiving state
T1, T2, T3, TS _ R2T, TS _ T2R: time interval
TX: transmitting state
Detailed Description
Fig. 1 is a block diagram illustrating an example of a communication device according to a first embodiment of the present invention. The communication device 100 may include at least one antenna 110, a collision detection device 120, a transceiver 130, and a processor 140. It is noted that fig. 1 is a simplified schematic diagram of a communication device, in which only the elements relevant to the present invention are shown. It will be understood by those skilled in the art that a communication device may include many components not shown in fig. 1 to perform the functions of wireless communication and related signal processing.
The wireless transceiver 130 is used for transmitting or receiving wireless signals through the antenna 110. The collision detection device 120 is used for performing collision detection in a time interval before the transceiver 130 transmits a packet or after the transceiver transmits a packet, wherein the collision detection may include energy detection and packet characteristic detection. More specifically, the collision detection device 120 may perform energy detection for detecting energy in the wireless transmission channel and correspondingly generating a detection result, and/or perform packet characteristic detection for detecting whether a packet conforming to a predetermined characteristic is transmitted in the wireless transmission channel and correspondingly generating a detection result. The processor 140 is configured to adjust at least one transmission parameter according to the detection result. As used herein, "a and/or B" and "at least one of a and B" refer to any combination of one or more of the listed associated items (A, B) (e.g., A, B or a combination of a and B).
For the purpose of describing the operation of the present invention, the collision detection device 120 is illustrated outside the wireless transceiver 130 in fig. 1 to distinguish the packet transmission operation and the collision detection operation. It should be noted, however, that in the embodiment of the present invention, the collision detection device 120 may be implemented as a part of the transceiver 130, or may be implemented as a separate device disposed outside the transceiver 130. When the collision detection device 120 is implemented as part of the transceiver 130, the collision detection device 120 is disposed within the transceiver 130 and may be implemented as part of the baseband signal processing circuit of the transceiver 130.
According to a first embodiment of the present invention, the communication device 100 may operate in compliance with the CSMA or CA communication protocol specified in the 802.11 communication specification and operate in a half-duplex transmission mode. That is, when the transceiver 130 transmits packets, it cannot receive packets at the same time.
Generally, in a CSMA or CA communication environment, all transmitting apparatuses need to perform a collision avoidance process (CA) before transmitting a packet, that is, detect whether a Channel is idle (CCA), if so, wait for an Inter Frame Space (IFS) time before detecting whether the Channel is idle, and if so, determine that the packet can be transmitted.
When one communication protocol layer (for example, a Medium Access Control (MAC) layer) in the wtru 130 determines that a packet can be transmitted through the above procedure, a corresponding command may be generated to notify another communication protocol layer (for example, a physical layer) to notify the corresponding components (for example, the baseband signal processing circuits and the rf signal processing circuits) of the layer to switch their states from a receiving state to a transmitting state for transmitting the packet. At this time, if the radio transceiver 130 is designed as a half-duplex radio transceiver circuit, the CCA cannot be performed after the physical layer enters the transmission state.
Since the signaling between the communication protocol layers and the state switching of the communication protocol layers require time, the transceiver 130 needs a transition time TS _ R2T to switch from the full receiving state (RX mode) to the full transmitting state (TX mode), where the transition time TS _ R2 is allowed by the communication specification (e.g., 802.11 communication specification), and the stages associated with the transmitting/receiving operation within the transceiver 130 are all switched to the corresponding states. Similarly, when the transceiver 130 completes transmitting the packet, it also needs a transition time TS _ T2R to transition from the full Transmit (TX) state to the full Receive (RX) state.
However, during the transition time, there may still be undetected transmission behavior occurring in the wireless transmission channel, for example, another device in the network may determine to start transmitting packets at a very close time point, and the undetected transmission behavior may cause the packet transmission at the transmitting end to collide. When collision occurs, the packet transmitted by the transmitting end may not be correctly received by the receiving end, which may increase the packet error rate, affect the quality of the transmitted data, and may cause the transmitting end to misunderstand that the error occurs due to the excessively fast transmission rate, thereby reducing the transmission rate. However, when the transmission rate is reduced, the time required for transmitting the packet is lengthened, resulting in a higher probability of collision and a higher deterioration of the transmission quality.
To solve the above problem, the present invention at least configures a collision detection device (e.g., 120/420) in the communication device to perform collision detection before transmitting a packet, after transmitting a packet, or during a time interval during which a packet is being transmitted.
Fig. 2 is a timing chart showing collision detection according to the first embodiment of the present invention. The collision detection device 120 performs collision detection during a time interval T1 before the wtru 130 transmits the packet 200 and during a time interval T2 after the wtru 130 transmits the packet 200, wherein the time interval T1 covers a time interval during which the wtru 130 transitions from the receiving state to the transmitting state, and the time interval T2 covers a time interval during which the wtru 130 transitions from the transmitting state to the receiving state.
Fig. 3 is a timing chart showing state transition and collision detection according to the first embodiment of the present invention. It can be seen that the state switching of the rf circuit (which may include the rf processing circuit and the antenna in the wtru 130) and the state switching of the MAC layer have a time delay (latency). That is, when the MAC layer determines that it can start transmitting a packet and switches from the receiving state RX to the transmitting state TX, the rf circuit cannot immediately switch from the receiving state to the transmitting state. In the embodiment of the present invention, the collision detection device 120 may perform collision detection at a time interval T1 before transmitting the packet, and the time interval T1 covers a time interval when the wtru 130 transitions from the receiving state to the transmitting state, or a time delay when the MAC layer transitions from the receiving state to the transmitting state and when the rf circuit transitions from the receiving state to the transmitting state, as viewed from the communication protocol layer, such as the time interval TS _ R2T shown in the figure, and the length of the time interval T1 may be greater than or equal to the length of the time interval TS _ R2T.
In the embodiment of the invention, the collision detection performed by the collision detection device 120 in the time interval T1 includes energy detection, as shown in fig. 3, the energy detection is enabled (with the level pulled high) in the time interval T1.
By performing collision detection during the time interval T1, it is possible to effectively detect a collision that cannot be detected by the conventional technology when the wireless transceiver 130 is in the transition state.
In addition, in the embodiment of the invention, the collision detection apparatus 120 may perform collision detection at a time interval T2 after the packet is transmitted, the time interval T2 may start at a time when the wtru 130 completes transmission of the packet, and may cover a time interval when the wtru 130 switches from a transmission state to a reception state, or cover a time delay when the MAC layer switches from the transmission state TX to the reception state RX and the rf circuit actually performs packet reception, for example, the time interval TS _ T2R shown in the figure, and the length of the time interval T2 may be greater than or equal to the length of the time interval TS _ T2R.
According to an embodiment of the present invention, the time Interval T2 may start at a time when the wtru 130 completes transmitting the packet, and the length of the time Interval T2 may be designed to be related to the time length of waiting for an acknowledgement (ack) of the packet, wherein the time length of waiting for the ack may be a Short Interval Frame Space (SIFS), and the length of the time Interval T2 may be greater than or equal to the SIFS time length defined by the communication specification.
In the embodiment of the present invention, the collision detection performed by the collision detection device 120 in the time interval T2 includes energy detection and packet signature detection, as shown in fig. 3, the operation of energy detection and packet signature detection is enabled (indicated by the level being pulled high) in the time interval T2. In addition, it should be understood that one of ordinary skill in the art can adjust the lengths of the time interval T1 and the time interval T2, and the time when the energy detection operation overlaps with the packet signature detection operation according to the actual design requirements.
By performing collision detection during the time interval T2, it is possible to effectively detect a collision that cannot be detected by the wtru 130 during the transition, and when the wtru 130 fails to receive the acknowledgement, it is possible to determine whether the acknowledgment cannot be received due to the collision during the time interval T2 or the acknowledgment cannot be received due to the packet not being correctly transmitted to the receiver according to the collision detection result. For example, the length of the time interval T2 can be set to the time TS _ T2R required for transition plus the time of the short interframe space (SIFS). Assuming that the collision detection device 120 detects a collision at the beginning of the time interval T2, it can be inferred that the packet collides with other packets or energy during transmission. If the collision detection device 120 detects a collision after a certain period of time after the beginning of the time interval T2, it can be inferred that other packets or energy collide with the acknowledgement reply intended to be received by the communication device.
Fig. 4 is a block diagram illustrating an example of a communication device according to a second embodiment of the present invention. The communication device 400 may include at least one antenna 410, a collision detection device 420, a transceiver 430, a processor 440, and a feedback signal cancellation device 450. It is noted that fig. 4 is a simplified schematic diagram of a communication device, in which only the elements relevant to the present invention are shown. It will be understood by those skilled in the art that a communication device may include many elements not shown in fig. 4 to perform the functions of wireless communication and related signal processing.
The wireless transceiver 430 is used for transmitting or receiving wireless signals through the antenna 410. The collision detection device 420 is used for performing collision detection before the wtru 430 transmits a packet, after the wtru transmits a packet, or during a time interval during which the wtru is transmitting a packet, wherein the collision detection may include energy detection and packet characteristic detection. More specifically, the collision detection device 420 may perform energy detection for detecting energy in the wireless transmission channel and generating a detection result accordingly, and/or perform packet characteristic detection for detecting whether a packet conforming to a predetermined characteristic is transmitted in the wireless transmission channel and generating a detection result accordingly. The processor 440 is configured to adjust at least one transmission parameter according to the detection result.
According to the second embodiment of the present invention, the feedback signal cancellation device 450 is configured to receive a detection signal from the radio interface through the antenna 410, and generate a processed signal according to the detection signal and a transmission signal of the wireless transceiver 430. In another embodiment, the feedback signal cancellation device 450 does not receive the detection signal directly from the wireless transceiving device 430 through the antenna 410. More specifically, the feedback signal cancellation device 450 may generate the processed signal by subtracting the transmitted signal from the detected signal, wherein the amplitude of the detected signal is properly suppressed before the subtraction operation, and the feedback signal cancellation device 450 may perform the subtraction operation in the analog domain or the digital domain. The collision detection device 420 receives the processed signal from the feedback signal cancellation device 450, and detects the energy in the wireless transmission channel during the time interval when the wireless transceiver 430 is transmitting packets and/or detects whether there is a packet in the wireless transmission channel that meets a predetermined characteristic.
Similarly, in the embodiment of the present invention, the collision detection device 420 and the feedback signal cancellation device 450 can be implemented as a part of the transceiver 430, such as a part of the baseband signal processing circuit, or can be implemented as a separate device disposed outside the transceiver 430.
Fig. 5 is a timing chart showing collision detection according to the second embodiment of the present invention. The collision detection apparatus 420 may perform collision detection during a time interval T1 before the wtru 430 transmits the packet 200, a time interval T2 after the wtru 200 transmits the packet, and a time interval T3 during which the wtru 200 is transmitting, wherein the time interval T1 covers a time interval during which the wtru 430 transitions from the receiving state to the transmitting state, the time interval T2 covers a time interval during which the wtru 430 transitions from the transmitting state to the receiving state, and the time interval T3 overlaps with the time interval during which the wtru 430 transmits the packet 200. Those skilled in the art can derive the timing chart shown in fig. 3 according to fig. 5, and therefore the description thereof is omitted.
In the second embodiment of the present invention, by performing collision detection additionally at the time interval T3, a collision occurring when the wtru 430 is transmitting a packet can be effectively detected.
According to an embodiment of the invention, the collision detection device 120/420 may perform energy detection based on an energy threshold, wherein the energy threshold may be dynamically adjusted by the processor 140/440 based on system requirements. In addition, the energy threshold may also be set according to the specifications of the communication specification. For example, the energy threshold may be set to be lower than the lowest energy of the packet defined in the communication specification, so that the energy of the hidden node (hidden node) can be further detected. In addition, according to an embodiment of the present invention, the collision detection device 120/420 may perform packet characteristic detection according to specific profiles (profiles) to detect whether a packet meeting a predetermined characteristic is transmitted in the wireless transmission channel. For example, the Orthogonal Frequency Division Multiplexing (OFDM) packet has a repetitive characteristic, and the collision detection device 120/420 can determine whether the detected signal/energy is an OFDM packet. By filtering and determining the detected energy through a particular characterization, the collision detection device 120/420 may determine that the detected energy is of the energy of noise or of a packet. According to an embodiment of the invention, if the detected energy is noise, the processor 140/440 may not regard the detected energy as collision or adjust the transmission parameters according to the collision result. Otherwise, if the detected energy belongs to the energy of the packet, the processor 140/440 may adjust the transmission parameters according to the collision result.
According to an embodiment of the present invention, when the collision detection device 120/420 detects energy during the time interval T1, the wtru 130/430 is informed to attempt to cancel the next packet transmission schedule. If the energy is detected early enough, the following packet transmission can be cancelled successfully to avoid collision. If the next packet transmission can not be cancelled, the detection result can be recorded for the use of subsequent adjustment of transmission parameters.
According to an embodiment of the invention, the processor 140/440 may count the number of collisions occurring within the time intervals T1, T2 and/or T3 according to the detection results of the time intervals T1, T2 and/or T3, and adjust transmission parameters according to the count results, wherein the transmission parameters may be selected from a group consisting of a transmission rate, a contention window length, an enabling of a transmission mechanism requiring transmission/allowing transmission, an enabling of a retransmission mechanism, an enabling of a packet aggregation mechanism, a usage of a transmission opportunity, a time length of the transmission opportunity, a transmission power, a transmission bandwidth and a transmission band.
For example, suppose that the communication device 100/400 has failed 300 transmissions and 700 transmissions in 1000 packets transmitted within a predetermined time interval. In the conventional technique, if the determination is made only based on the data, it is very likely that the transmission rate is decreased due to the over-high failure rate (30%). However, in the embodiment of the present invention, the processor 140/440 can count the number of collisions occurring within the predetermined time interval to be 250 times according to the detection result, and the processor 140/440 can recalculate the true failure rate to be 6.7% according to the statistical result and determine how to adjust the transmission rate according to the failure rate (in a case that the adjustment range is smaller than the failure rate by 30%), or can determine that the transmission rate does not need to be adjusted. Therefore, the situation that the transmission rate needs to be reduced is avoided. In addition, the processor 140/440 may also determine whether to adjust the transmission time of the packet according to the statistical result to avoid collision again.
As another example, the latency in 802.11 systems is a Distributed Coordination Function (DCF) frame interval (DCF IFS) plus a random number generated Contention Window (Contention Window). When the processor 140/440 finds the collision probability is too high according to the statistical result, the selection of the contention window may be adjusted, for example, the range of the random number is enlarged to adjust the length of the contention window, thereby reducing the collision probability.
As yet another example, the 802.11 communication specification defines two transmission mechanisms/protection mechanisms, namely Request To Send (RTS) and Clear To Send (CTS) and CTS2SELF, but does not specify the timing to use. The processor 140/440 may determine whether to enable the request-to-transfer/allow-to-transfer mechanism based on the statistics. For example, when the collision rate is too high, it is determined that this mechanism is enabled for subsequent packet transmissions.
For another example, since the Broadcast packet (Broadcast or Multicast packet) has no acknowledgement (Acknowledge), the sender cannot know whether the receiver correctly received the Broadcast packet. Therefore, the processor 140/440 may determine whether to enable the resending mechanism according to the statistics. For example, when the collision rate is too high, it is determined to resend the broadcast packet.
For example, the processor 140/440 may determine whether to enable a frame aggregation (frame aggregation) mechanism or adjust the number of packet aggregations appropriately according to the statistical result to achieve the best channel utilization efficiency. The packet aggregation is used for combining a plurality of packets together to form one packet, so that the number of resource competition times can be effectively reduced, and the channel use efficiency is improved. For example, when the collision rate is too high, the packet aggregation mechanism is disabled or the number of packet aggregations is reduced depending on the subsequent transmission.
As yet another example, the 802.11e (qos) communication specification defines a transmit opportunity (TxOP) as a means to increase the efficiency of channel utilization, and the parameter TxOP limit represents the maximum length of a transmission. During the TxOP, packets are sent one after another without re-competing for channel utilization, however, once a collision occurs during the TxOP, it is likely that consecutive packet collisions will occur, which may affect the channel utilization efficiency. Accordingly, the processor 140/440 can determine whether to use the transmission opportunity according to the statistical result and/or adjust the time length of the TxOP. For example, when the collision rate is too high, the transmit opportunity is disabled or the length of time for the TxOP is shortened depending on the subsequent transmission.
For example, the crash detection device 120/420 may inform the processor 140/440 of the detected energy intensity, and the processor 140/440 may determine whether to adjust the transmission power according to the information. For example, when the interference energy is too high, the processor 140/440 may increase the transmission power to increase the signal-to-noise ratio (SNR) of subsequently transmitted packets and reduce the transmission failure rate.
In addition to the above applications, in one embodiment of the present invention, the collision detection device 120/420 can perform full-band collision detection. More specifically, the collision detecting device 120/420 may filter the signal received from the radio interface by using a filter having a filtering range set to the entire frequency band used by the communication device 100/400 to perform wireless communication, and the collision detecting device 120/420 may perform full-band collision detection based on the filtered signal.
In another embodiment of the present invention, the collision detection device 120/420 can perform collision detection on multiple sub-bands. More specifically, the frequency band used by the communication device 100/400 to perform wireless communication may be split into a plurality of sub-frequency bands, and the collision detection device 120/420 may filter the signals received from the radio interface by using a plurality of filters, wherein the filtering range of each filter may be set to a corresponding sub-frequency band range to filter out the signals of each sub-frequency band. The collision detection device 120/420 performs collision detection on the respective sub-bands based on the filtered signals and provides the detection results of the respective sub-bands to the processor 140/440. The processor 140/440 can determine whether to use a smaller bandwidth for transmission in subsequent transmissions and/or select a sub-band with a lower number of collisions for transmission according to the detection result to reduce the probability of collision.
Fig. 6 is a flowchart illustrating an exemplary method for adjusting transmission parameters according to an embodiment of the invention.
Step 610: the communication device determines to transmit a packet. As described above, the MAC layer determines to transmit a packet after determining that the channel is idle through the above process.
Step 620: performing collision detection before transmitting the packet, after transmitting the packet, and/or during transmitting the packet.
Step 630: and acquiring a collision detection result.
Step 640: and adjusting at least one transmission parameter according to the detection result.
By combining the collision detection and transmission parameter adjustment mechanism provided by the invention, the collision can be efficiently detected, and the transmission parameters can be further correctly adjusted according to the detection result, so that the transmission efficiency can be effectively improved.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
Claims (10)
1. A communication device, comprising:
a wireless transceiver for transmitting or receiving wireless signals, the wireless transceiver comprising:
a collision detection device for detecting the energy in a wireless transmission channel in a first time interval before the wireless transceiver transmits a packet and correspondingly generating a detection result; and
a processor for adjusting at least one transmission parameter according to the detection result,
the first time interval covers a time interval when the wireless transceiver is switched from a receiving state to a transmitting state.
2. The communications apparatus as claimed in claim 1, wherein the collision detection device further detects energy in the wireless transmission channel at a second time interval after the transceiver transmits the packet, and correspondingly generates the detection result, wherein the second time interval starts at a time when the transceiver completes transmission of the packet.
3. The communications apparatus as claimed in claim 2, wherein the second time interval covers a time interval during which the wireless transceiver device transitions from the transmitting state to the receiving state.
4. The communications apparatus as claimed in claim 2, wherein the collision detection device further detects whether a packet conforming to a predetermined characteristic is transmitted in the wireless transmission channel during the second time interval, and generates the detection result accordingly.
5. The communications apparatus as claimed in claim 1, wherein the collision detection device further performs at least one of detecting energy in the wireless transmission channel and detecting whether there is a packet in the wireless transmission channel that meets a predetermined characteristic transmitted during a third time interval when the transceiver transmits the packet, and generates the detection result accordingly.
6. The communications apparatus of claim 5, further comprising:
a feedback signal eliminating device for receiving a detection signal and generating a processed signal according to the detection signal and a transmission signal of the wireless transceiver.
7. The communication device as claimed in claim 6, wherein the feedback signal cancellation device generates the processed signal by subtracting the transmission signal from the detection signal, and the collision detection device detects energy in the wireless transmission channel during the third time interval according to the processed signal and/or detects whether a packet conforming to the predetermined characteristic is transmitted in the wireless transmission channel during the third time interval.
8. The communication device as claimed in claim 1, wherein the processor further counts a number of collisions occurring within the first time interval according to the detection result, and adjusts the transmission parameter according to the statistical result.
9. The communications apparatus of claim 8 wherein the transmission parameters are selected from a group consisting of a transmission rate, a contention window length, an enabling of a transmission scheme requiring transmission/permitting transmission, an enabling of a retransmission scheme, an enabling of a packet aggregation scheme, a usage of a transmission opportunity, a time length of the transmission opportunity, a transmission power, a transmission bandwidth, and a transmission band.
10. A transmission parameter adjustment method comprises the following steps:
detecting energy in a wireless transmission channel in a first time interval before a communication device transmits a packet, and correspondingly generating a detection result; and
adjusting at least one transmission parameter according to the detection result,
the first time interval covers a time interval during which a wireless transceiver of the communication device is switched from a receiving state to a transmitting state.
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