Wireless communication device and packet protection method

Abstract

A wireless communication device and a packet protection method. The wireless communication device is used at a transmitting end of a wireless communication system and includes a wireless analog transmitting unit for transmitting a data packet on a data transmission channel, and a packet generating unit for generating a data packet and at least one protection packet. Before transmitting the data packet on the data transmission channel, the wireless communication device transmits at least one protection packet on at least one adjacent channel of the data transmission channel to instruct at least one user of at least one adjacent channel to stop using at least one adjacent channel before the data packet transmission is completed, and the frequency band of at least one adjacent channel overlaps with the frequency band of the data transmission channel.

Description

Technical Field

[0001] The present invention relates to a wireless communication device and a packet protection method for a transmitting end of a wireless communication system, and more particularly to a wireless communication device and a packet protection method that can send protection packets in adjacent channels with overlapping frequency bands to avoid data packet collisions between adjacent channels and data transmission channels. Background Art

[0002] In a wireless communication system, before transmitting a data packet, a protection mode is usually used to reduce the possibility of collision with other users; for example, in the 802.11 standard, request to send (RTS), clear to send (CTS), or clear to send to self (CTS2Self) are all methods of the protection mode. A specific network allocation vector (NAV) time can be carried in these types of packets. By announcing the NAV time, surrounding users are notified that the next period of time will be used. For example, the NAV time announced in RTS is 3.5 ms, which means that the time from the start of the RTS packet is 3.5 ms during which no packets can be sent, that is, the channel is regarded as being "occupied". The essence of the so-called protection mode is to send a reminder packet before sending a data packet to notify surrounding users not to use the channel, thereby achieving the purpose of protecting the transmitted data.

[0003] However, in a free frequency band such as 2.4 GHz used by WiFi, the interval between each used channel is 5 MHz. Only three channels in the entire frequency band are completely staggered and do not affect each other when using 20 MHz. Generally, in use, there will be an overlap of adjacent channels from 5 MHz to 15 MHz (when using 40 MHz, there will be an overlap from 5 MHz to 35 MHz). The overlapping signals cannot be demodulated and will be regarded as noise, thereby affecting the channel usage and being regarded as a collision behavior. This collision behavior is unavoidable at 2.4 GHz.

[0004] In view of this, there is a need for improvement in the prior art. Summary of the Invention

[0005] Therefore, the main objective of the present invention is to provide a wireless communication device and a packet protection method that can send protection packets in adjacent channels with overlapping frequency bands to avoid data packet collisions between adjacent channels and data transmission channels.

[0006] The present invention discloses a wireless communication device for a transmitting end of a wireless communication system, which includes a wireless analog transmitting unit for transmitting a data packet on a data transmission channel, and a packet generating unit for generating a data packet and at least one protection packet. Before transmitting the data packet on the data transmission channel, the wireless communication device transmits at least one protection packet on at least one adjacent channel of the data transmission channel to instruct at least one user of at least one adjacent channel to stop using at least one adjacent channel before the data packet transmission is completed. The frequency band of at least one adjacent channel overlaps with the frequency band of the data transmission channel.

[0007] The present invention also discloses a packet protection method for a transmitting end of a wireless communication system. The packet protection method includes generating a data packet and at least one protection packet, transmitting at least one protection packet on at least one adjacent channel of the data transmission channel before transmitting the data packet on the data transmission channel to instruct at least one user of at least one adjacent channel to stop using at least one adjacent channel before the data packet transmission is completed, and transmitting the data packet on the data transmission channel through a wireless analog transmitting unit. The frequency band of at least one adjacent channel of the wireless communication device overlaps with the frequency band of the data transmission channel. Brief Description of the Drawings

[0008] Figure 1 It is a schematic diagram of a wireless communication device according to Embodiment 1 of the present invention.

[0009] Figure 2 It is a schematic diagram of the frequency spectrum of a data packet and a protection packet according to Embodiment 1 of the present invention.

[0010] Figure 3 For Embodiment of the Present Invention Figure 1 It is an operation schematic diagram of the wireless communication device shown in the present invention.

[0011] Figure 4 It is a schematic diagram of another wireless communication device according to Embodiment 1 of the present invention.

[0012] Figure 5 It is a schematic diagram of another wireless communication device according to Embodiment 1 of the present invention.

[0013] Figure 6 It is a schematic diagram of another wireless communication device according to Embodiment 1 of the present invention.

[0014] Figure 7 It is a schematic diagram of the frequency spectrum of a data packet and a protection packet according to Embodiment 1 of the present invention.

[0015] Figure 8 It is a schematic diagram of the packet protection process according to Embodiment 1 of the present invention. Detailed Description of the Embodiment

[0016] In the 2.4 GHz microwave band, protocol specifications such as 802.11a / b / g / n / ax define more than a dozen channels in the 2.4 GHz band. Each channel has a bandwidth of 20 MHz and they overlap with each other. Most wireless communication systems, whether they are Orthogonal Frequency-Division Multiplexing (OFDM) or Spread Spectrum systems, usually do not have the ability to demodulate packets on adjacent channels. As a result, the probability of collisions increases significantly because the packets on these overlapping channels cannot be correctly demodulated from each other. For example, if there is a transmitting device A transmitting on channel Ch1, and there is a transmitting device B on an adjacent channel Ch2 or Ch3. Originally, transmitting device A can transmit packets at the orthogonal frequency-division multiplexing 54M physical rate (phy rate) to allow the receiving end to receive the packets. At this time, the packet error ratio (PER) counted by transmitting device A can be within 10%, meeting the specification requirements. However, once the transmitting device B on the adjacent channel Ch2 or Ch3 also starts transmitting packets, since transmitting device A cannot demodulate the packet data on the adjacent channel Ch2 or Ch3, there is a chance that transmitting device A will mistake the channel as idle and transmit packets. At this time, this packet may not be correctly received, resulting in a significant increase in the packet error rate and affecting the quality of the transmitted data. According to the protection mode of 802.11, transmitting device A sends RTS / CTS or CTS2Self packets for protection before transmitting data. At this time, due to the frequency band shift of 5 MHz, 10 MHz or 15 MHz between transmitting device A and transmitting device B, transmitting device B cannot recognize the RTS / CTS or CTS2Self packets and still transmits packets. In this case, collisions will still occur. In other words, such RTS / CTS packets cannot fully protect the data packets.

[0017] Therefore, for a transmitting end of a wireless communication system, the present invention provides a wireless communication device. Before transmitting a data packet on a data transmission channel, at least one protection packet can be transmitted on at least one adjacent channel of the data transmission channel to instruct at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before the data packet transmission is completed, where the frequency band of the at least one adjacent channel overlaps with the frequency band of the data transmission channel. In this way, in the microwave band with a high degree of channel overlap, the present invention can send protection packets that can be decoded by users of the adjacent channel on the adjacent channel, so that users of the adjacent channel will not send packets to collide with the data packets on the data transmission channel, thereby achieving optimal transmission performance.

[0018] Specifically, please refer to Figure 1 , Figure 1Schematic diagram of wireless communication device 100 according to Embodiment 1 of the present invention. As Figure 1 shown, the wireless communication device 100 is used for a transmitting end of a wireless communication system, and includes a wireless analog transmitting unit 120 connected to an antenna 110, a baseband processing unit 130 connected to the wireless analog transmitting unit 120, and a packet generating unit 140. The packet generating unit 140 can be a micro-control unit (MCU), a central processing unit (CPU), or a media access control (MAC) layer packet generator. Briefly speaking, the wireless analog transmitting unit 120 transmits a data packet DP on a data transmission channel DC, and the packet generating unit 140 can generate the data packet DP and protection packets PP1 to PPN. After digital modulation processing by the baseband processing unit 130, the data packet DP and the protection packets PP1 to PPN are converted by the wireless analog transmitting unit 120 to corresponding channels and sent out, and finally transmitted into the air through the antenna 110. In this case, before transmitting the data packet DP on the data transmission channel DC, the wireless communication device 100 transmits the protection packets PP1 to PPN on adjacent channels AC1 to ACN of the data transmission channel DC to instruct at least one user of the adjacent channels AC1 to ACN to stop using the adjacent channels AC1 to ACN before the data packet DP is transmitted. Among them, the frequency bands of the adjacent channels AC1 to ACN overlap with the frequency band of the data transmission channel DC. In this way, in the microwave frequency band with a high degree of channel overlap, the present invention can send protection packets that can be decoded by users of adjacent channels on the adjacent channels, so that users of adjacent channels will not send packets to collide with the data packets on the data transmission channel, so as to achieve optimal transmission performance.

[0019] Specifically, the baseband processing unit 130 may include an offset bandwidth unit 150. When transmitting the protection packets PP1 to PPN transmitted on the adjacent channels AC1 to ACN of the data transmission channel DC, the offset bandwidth unit 150 will be activated and convert the protection packets PP1 to PPN into frequency-shifted packets, and perform digital frequency-shifting processing to make the protection packets PP1 to PPN shift relative to the data packet DP on a baseband spectrum. Specifically, please refer to Figure 2 , Figure 2 Spectrum schematic diagram of data packet DP and protection packets PP1 to PP2 according to an embodiment of the present invention. Figure 2As shown, after the packet generation unit 140 generates the data packet DP, digital modulation, encoding, and other processes are performed in the baseband processing unit 130. At this time, the digital frequency shift unit 150 is not activated. The wireless analog transmission unit 120 loads the processed data packet DP (with a baseband frequency between -10 MHz and 10 MHz) onto a center frequency Fc corresponding to the high frequency, and finally transmits it through the antenna 110. Taking 802.11 as an example, the center frequency of channel CH1 is 2412 MHz, and the center frequency of channel CH2 is 2417 MHz. Therefore, if it is operating on the channel of CH2, the wireless analog transmission unit 120 will set the center frequency Fc = 2417 MHz, and the frequency band of the data packet DP is 2407 to 2427 MHz.

[0020] In addition, after the packet generation unit 140 generates a protection packet PP1, digital modulation, encoding, and other processes are performed in the baseband processing unit 130. If the digital frequency shift unit 150 is activated at this time, the protection packet PP1 is shifted 5 MHz in the positive frequency direction. Then, the wireless analog transmission unit 120 loads the processed protection packet PP1 (with a baseband frequency between -5 MHz and 15 MHz) onto the center frequency Fc corresponding to the high frequency to become a frequency-shifted packet. Due to the frequency offset, the equivalent center frequency Fc' for transmitting the processed protection packet PP1 also offsets 5 MHz from the real center frequency Fc. In other words, the processed protection packet PP1 can be regarded as having a center frequency of Fc'. Therefore, the wireless communication device 100 originally transmits the data packet DP on channel CH2 with a center frequency of 2417 MHz. After being processed by the digital frequency shift unit 150, it becomes similar to transmitting the protection packet PP1 on channel CH3 with a center frequency of 2422 MHz. So, the processed protection packet PP1 becomes a general packet that can be demodulated on channel CH3.

[0021] On the other hand, after the packet generation unit 140 generates another protection packet PP2, digital modulation, encoding and other processes are performed by the baseband processing unit 130. If the digital frequency shift unit 150 is activated at this time, the protection packet PP2 is shifted 5 MHz in the negative frequency direction, and then the processed protection packet PP2 (the baseband frequency is between -15 MHz and 5 MHz) is carried by the wireless analog transmission unit 120 to the corresponding center frequency Fc of the high frequency to become a frequency-shifted packet. Due to the frequency offset, an equivalent center frequency Fc' for transmitting the processed protection packet PP2 is also offset by 5 MHz from the true center frequency Fc. In other words, the processed protection packet PP2 can be regarded as having a center frequency of Fc'. Therefore, the wireless communication device 100 originally transmitted the data packet DP on the channel CH2 with a center frequency of 2417 MHz. After being processed by the digital frequency shift unit 150, it becomes similar to transmitting the protection packet PP2 on the channel CH1 with a center frequency of 2412 MHz. So the processed protection packet PP2 becomes a general packet that can be demodulated on the channel CH1. In terms of circuit implementation, the digital frequency shift unit 150 can be implemented by a complex multiplier (exp(jwt)). In this way, the digital frequency shift unit 150 can perform digital frequency shift processing to shift the protection packets PP1 to PPN relative to the data packet DP in the frequency spectrum, so that at least one equivalent center frequency for transmitting the processed protection packets PP1 to PPN is equal to at least one center frequency of the adjacent channels AC1 to ACN, so as to transmit the protection packets PP1 to PPN on the adjacent channels AC1 to ACN without changing the operating center frequency Fc.

[0022] Specifically, please refer to Figure 3 , Figure 3 which is Figure 1 the operation schematic diagram of the wireless communication device 100 shown in the embodiment of the present invention. As Figure 3As shown, in the 802.11 standard, before transmitting a data packet DP, the wireless communication device 100 acting as a transmitter can first send an RTS packet 320 for protection, and the receiver then replies with a CTS packet 310 indicating that the channel is clear. The RTS packet 320 carries the NAV time, representing the time that the transmitter is about to occupy this channel (i.e., indicating the time required until the data packet DP is transmitted). In this case, the present invention further transmits protection packets PP1 to PPN before the RTS packet 320 for protection. The protection packets PP1 to PPN can be CTS2self packets. The protection packets PP1 to PPN can be frequency-offset in the positive frequency direction like the protection packet PP1 or in the negative frequency direction like the protection packet PP2, and each of the protection packets PP1 to PPN has its own different offset frequencies. The protection packets PP1 to PPN also carry the NAV time, representing the time that the wireless communication device 100 acting as a transmitter is about to occupy this channel (i.e., indicating that at least one user of at least one neighboring channel stops using the at least one neighboring channel before the data packet DP is transmitted), and using this NAV time to ensure that no collision occurs with other packets during the transmission of the data packet DP.

[0023] It should be noted that the above embodiments of the present invention mainly transmit the protection packets PP1 to PPN in the neighboring channels AC1 to ACN of the data transmission channel DC to indicate that at least one user of the neighboring channels AC1 to ACN stops using the neighboring channels AC1 to ACN before the data packet DP is transmitted, so as to avoid collisions. Those with ordinary knowledge in the art can make modifications or variations accordingly, and are not limited thereto. For example, in Figure 2 and Figure 3 only two protection packets PP1 to PP2 are shown for illustration. In actual operation, when the WiFi channel bandwidth is 20 MHz, there is frequency band overlap between the channel and the three adjacent channels before and after (i.e., channel Ch4 overlaps with channels Ch1 to Ch3, Ch5 to Ch7), so 6 protection packets can be sent to avoid collisions (14 protection packets can be sent when the channel bandwidth is 40 MHz). In addition, since there is frequency band overlap between the channels Ch3 and Ch1 corresponding to the protection packets PP1 and PP2 respectively, Figure 3 shows that they are transmitted in a time-sharing manner. However, if there is no frequency band overlap between the neighboring channels where the protection packets are transmitted, the protection packets can also be transmitted simultaneously (such as simultaneously transmitting non-overlapping protection packets on non-overlapping neighboring channels Ch2 and Ch6).

[0024] In addition, please refer to Figure 4 , Figure 4FIG. 0 is a schematic diagram of a wireless communication device 400 according to Embodiment 1 of the present invention. Similar components and functions in the wireless communication device 400 and the wireless communication device 100 are denoted by the same symbols, and their operations can be referred to the above content, which will not be described herein again for the sake of brevity. The main difference between the wireless communication device 400 and the wireless communication device 100 is that a baseband processing unit 430 of the wireless communication device 400 performs digital modulation processing but does not shift the frequency, and a wireless analog transmission unit 420 of the wireless communication device 400 further includes an analog frequency shift unit 450. When sending protection packets PP1 to PPN, the analog frequency shift unit 450 is activated and transforms the protection packets PP1 to PPN into frequency-shifted packets according to at least one center frequency of adjacent channels AC1 to ACN, so that the protection packets PP1 to PPN are shifted on a radio frequency spectrum and transmitted on the adjacent channels AC1 to ACN. In circuit implementation, the analog frequency shift unit 450 can be completed by a carrier frequency control unit to achieve the effect of sending frequency-shifted packets (for example, the baseband frequency of the protection packet PP1 is the same as that of the data packet DP, but only the carrier frequency of the protection packet PP1 is straight

[0025] On the other hand, please refer to Figure 5 , Figure 5 FIG. 7 is a schematic diagram of a wireless communication device 500 according to Embodiment 1 of the present invention. Similar components and functions in the wireless communication device 500 and the wireless communication device 100 are denoted by the same symbols, and their operations can be referred to the above content, which will not be described herein again for the sake of brevity. The main difference between the wireless communication device 500 and the wireless communication device 100 is that the wireless communication device 500 further includes an environment detection unit 560 coupled to the wireless analog transmission unit 120 and the packet generation unit 140, and the environment detection unit 560 can detect the usage situation of the environment channels. When other devices in the environment are using the adjacent channels AC1 to ACN, the environment detection unit 560 can notify the packet generation unit 140 to send the protection packets PP1 to PPN for protection before transmitting the data packet DP, so that the data packet DP will not collide with the packets sent by other devices on the adjacent channels AC1 to ACN. For example, after detecting the environment channels, the environment detection unit 560 determines that there are other devices using only when there are energy responses on channels CH1 and CH3, and then can send the protection packets PP1 and PP2 for protection only on channels CH1 and CH3.

[0026] On the other hand, please refer to Figure 6 , Figure 6Schematic diagram of a wireless communication device 600 according to Embodiment 1 of the present invention. Similar components and functions in the wireless communication device 600 and the wireless communication device 100 are denoted by the same symbols, and their operations can be referred to the above content and will not be elaborated here for brevity. The main difference between the wireless communication device 600 and the wireless communication device 100 is that the wireless communication device 600 further includes a frequency hopping protection unit 650, which includes an antenna 610, a frequency hopping protection baseband processing unit 631, and a frequency hopping protection wireless analog transceiver unit 621. The frequency hopping protection unit 650 has its own independent transmission unit, so it can perform packet transmission on any channel. When the packet generation unit 140 wants to send a data packet DP, since it knows the currently used data transmission channel DC and the bandwidth, the frequency hopping protection wireless analog transceiver unit 621 will move to the center frequencies of adjacent channels AC1 to ACN within the bandwidth coverage of the data transmission channel DC used by the wireless analog transmission unit 120, and cooperate to transmit protection packets PP1 to PPN (such as RTS or CTS-to-Self) to announce that the data transmission channel DC will be used next, so as to avoid overlapping frequency collisions. In this way, by adding the frequency hopping protection unit 650, the present invention can send protection packets that can be decoded by users of adjacent channels in adjacent channels in the microwave band with a high degree of channel overlap, so that users of adjacent channels will not send packets to collide with the data packets of the data transmission channel, thereby achieving optimal transmission efficiency.

[0027] Please refer to Figure 7 , Figure 7 Spectrum schematic diagram of a data packet DP and a protection packet PPx according to an embodiment of the present invention. As Figure 6 and Figure 7As shown, taking 802.11 as an example, the center frequency of channel CH1 is 2412MHz, and the center frequency of channel CH3 is 2422MHz. Therefore, if the operation is on the channel of channel CH1, the wireless analog transmitting unit 120 will set the center frequency Fc=2412MHz. If the frequency hopping protection unit 650 is activated and jumps to the center frequency of channel CH3 at the edge of the frequency band of channel CH1, after the packet generating unit 140 generates a protection packet PPx, the frequency hopping protection baseband processing unit 631 performs digital modulation, encoding, etc., and jumps to the center frequency Fc+10MHz of the wireless analog transmitting unit 120 through the frequency hopping protection wireless analog transceiver unit 621. In other words, the protection packet PPx transmits the packet at a frequency with a center frequency of Fc+10. Therefore, the data packet DP originally operating on the channel CH1 has a center frequency of 2412MHz, and its corresponding protection packet PPx also originally has a center frequency of 2412MHz. After being collaboratively processed by the frequency hopping protection unit 650, it becomes a protection packet PPx with a center frequency of 2422MHz. The user operating on the channel CH3 can therefore correctly demodulate the protection packet PPx and stop transmitting packets within the protection time to avoid collision with the channel CH1 user.

[0028] In this case, the timing of the wireless communication device 600 transmitting the protection packets PP1-PPN is Figure 3 The timing of the wireless communication device 100 transmitting the protection packets PP1-PPN is roughly similar. The related operations and changes can refer to the above content (i.e., the protection packet PPx can be transmitted on the channel CH3 first, and then the RTS packet 320, the CTS packet 310 and the data packet DP are transmitted on the channel CH1). It will not be described in detail here for the sake of brevity. In addition, since the frequency hopping protection wireless analog transceiver unit 621 included in the frequency hopping protection unit 650 can monitor any channel and detect the use of the environmental channel, it can have the same Figure 5 The environment detection unit 560 has a similar function as shown. When other devices in the environment are using adjacent channels AC1~ACN, the frequency hopping protection unit 650 can notify the packet generation unit 140 to allow the packet generation unit 540 to send protection packets PP1~PPN for protection before transmitting the data packet DP, so that the data packet DP will not collide with the packets sent by other devices in the adjacent channels AC1~ACN.

[0029] Therefore, the packet protection operation of the wireless communication device 100 can be summarized as a packet protection process 80, such as Figure 8 As shown, it includes the following steps:

[0030] Step 800: Start.

[0031] Step 802: Generate a data packet and at least one protection packet.

[0032] Step 804: Before transmitting the data packet on a data transmission channel, transmit the at least one protection packet on at least one adjacent channel of the data transmission channel to instruct at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before the data packet transmission is completed.

[0033] Step 806: Transmit the data packet on the data transmission channel through a wireless analog transmission unit; wherein, the frequency band of the at least one adjacent channel of the wireless communication device overlaps with the frequency band of the data transmission channel.

[0034] Step 808: End.

[0035] For the detailed operations of the packet protection process 80, reference can be made to the relevant content of the wireless communication device 100, which will not be elaborated here for the sake of brevity.

[0036] In summary, in the microwave frequency band with a high degree of channel overlap, the present invention can send protection packets that can be decoded by users of adjacent channels on adjacent channels, so that users of adjacent channels will not send packets to collide with the data packets on the data transmission channel, thereby achieving optimal transmission performance.

[0037] The above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

[0038]

Symbol Description

[0039] 100, 400, 500, 600: Wireless communication device

[0040] 110, 610: Antenna

[0041] 120, 420: Wireless analog transmission unit

[0042] 130, 430: Baseband processing unit

[0043] 140: Packet generation unit

[0044] 150: Digital frequency shift unit

[0045] 320: RTS packet

[0046] 310: CTS packet

[0047] 450: Analog frequency shift unit

[0048] 560: Environment detection unit

[0049] 650: Frequency hopping protection unit

[0050] 621: Frequency Hopping Protection Wireless Analog Transceiver Unit

[0051] 631: Frequency Hopping Protection Fundamental Frequency Processing Unit

[0052] 80: Process

[0053] 800 - 808: Steps

[0054] DP: Data Packet

[0055] PP1 - PPN: Protection Packets

[0056] CH1 - CH3: Channels

[0057] Fc: Center Frequency

[0058] Fc’: Equivalent Center Frequency

Claims

1. A wireless communication device for a transmitting end of a wireless communication system, the wireless communication device comprising: A wireless analog transmitting unit for transmitting a data packet on a data transmission channel; and A packet generating unit for generating the data packet and at least one protection packet; Wherein, Before transmitting the data packet on the data transmission channel, the wireless communication device transmits the at least one protection packet on at least one neighboring channel of the data transmission channel to instruct at least one user of the at least one neighboring channel to stop using the at least one neighboring channel before the data packet transmission is completed, and the frequency band of the at least one neighboring channel overlaps with the frequency band of the data transmission channel. Wherein, frequency shift processing is performed so that the at least one transmitted protection packet is offset on a spectrum relative to the data packet without changing the center frequency of the operation. And wherein, before transmitting the data packet on the data transmission channel, the wireless communication device transmits a request-to-transmit packet, and transmits the at least one protection packet on the neighboring channel before the request-to-transmit packet.

2. The wireless communication device according to claim 1, further comprising a baseband processing unit for performing digital modulation processing on the data packet and the at least one protection packet, the baseband processing unit comprising: A digital frequency shift unit for performing digital modulation processing to shift the at least one protection packet relative to the data packet on a baseband spectrum.

3. The wireless communication device according to claim 2, wherein after being processed by the digital frequency shift unit, at least one equivalent center frequency at which the at least one protection packet is transmitted is equal to at least one center frequency of at least one adjacent channel.

4. The wireless communication device according to claim 2, wherein the digital frequency shift unit is a complex multiplier.

5. The wireless communication device according to claim 1, wherein the wireless communication device simultaneously transmits at least one non-overlapping protection packet among the at least one protection packets in at least one non-overlapping adjacent channel among the at least one adjacent channels, and the frequency bands of the at least one non-overlapping adjacent channels do not overlap.

6. The wireless communication device according to claim 1, wherein the wireless analog transmitting unit comprises: An analog frequency shift unit for shifting the at least one protection packet relative to the data packet on a radio frequency spectrum according to at least one center frequency of the at least one adjacent channel.

7. The wireless communication device according to claim 1, further comprising: An environment detection unit coupled to the wireless analog transmitting unit and the packet generating unit for detecting the usage conditions of multiple environment channels; Wherein, The at least one neighboring channel is a channel being used among the multiple environmental channels.

8. The wireless communication device according to claim 1, further comprising: A frequency hopping protection unit comprising a frequency hopping protection wireless analog transmitting unit for transmitting the at least one protection packet on the at least one adjacent channel according to at least one center frequency of the at least one adjacent channel.

9. The wireless communication device according to claim 8, wherein the frequency hopping protection radio analog transmission unit detects the usage conditions of a plurality of environmental channels, and the at least one adjacent channel is a channel being used among the plurality of environmental channels.

10. A packet protection method for a transmitting end of a wireless communication system, the method comprising: generating a data packet and at least one protection packet; before transmitting the data packet on a data transmission channel, transmitting the at least one protection packet on at least one adjacent channel of the data transmission channel to instruct at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before the data packet transmission is completed; and transmitting the data packet on the data transmission channel through a radio analog transmission unit; wherein, The frequency band of the at least one neighboring channel of the wireless communication device overlaps with the frequency band of the data transmission channel. Wherein, frequency shift processing is performed so that the at least one transmitted protection packet is offset on a spectrum relative to the data packet without changing the center frequency of the operation. And wherein, before transmitting the data packet on the data transmission channel, the wireless communication device transmits a request-to-transmit packet, and transmits the at least one protection packet on the neighboring channel before the request-to-transmit packet.

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