CN113543363B

CN113543363B - Short wave chain building method

Info

Publication number: CN113543363B
Application number: CN202010306921.6A
Authority: CN
Inventors: 林文长; 孟梅梅; 刘德保; 冉浩
Original assignee: Hebi Tianhai Electronic Information System Co Ltd
Current assignee: Hebi Tianhai Electronic Information System Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2023-10-31
Anticipated expiration: 2040-04-17
Also published as: CN113543363A

Abstract

The application discloses a short wave link establishment method, which comprises the steps that calling equipment selects a first test frequency point from a short wave available frequency point set; transmitting a first call frame on the first test frequency point so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame; receiving a first response frame fed back by the called equipment on a first test frequency point, wherein the first response frame comprises the downlink channel quality of the first test frequency point; obtaining the uplink channel quality of a first test frequency point; if the downlink channel quality and the uplink channel quality of the first test frequency point are determined to be in accordance with the preset link establishment condition, the first test frequency point and the called equipment are utilized to establish a link. According to the scheme, short wave link establishment of the calling equipment and the called equipment can be realized, communication quality of the calling equipment and the called equipment after link establishment can be ensured as much as possible, and smooth completion of communication of the two parties is facilitated.

Description

Short wave chain building method

Technical Field

The application relates to the technical communication field, in particular to a short wave link establishment method.

Background

Short-wave communication is a radio communication technology, and short-wave communication emission electric waves can reach called equipment only through reflection of an ionosphere, and the short-wave communication becomes a main means of remote communication due to the outstanding advantages of long communication distance, difficulty in thorough destruction and the like, and is widely applied to important fields of communication in various countries, emergency disaster relief, ocean monitoring and the like. In view of this, how to implement short-wave link establishment of a calling device and a called device is a problem to be solved.

Disclosure of Invention

The application mainly solves the technical problem of providing a short wave link establishment method which can realize the short wave link establishment of calling equipment and called equipment.

In order to solve the technical problem, a first aspect of the present application provides a short wave link establishment method, including that a calling device selects a first test frequency point from a set of available short wave frequency points; transmitting a first call frame on the first test frequency point so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame; receiving a first response frame fed back by the called equipment on a first test frequency point, wherein the first response frame comprises the downlink channel quality of the first test frequency point; obtaining the uplink channel quality of a first test frequency point; if the downlink channel quality and the uplink channel quality of the first test frequency point are determined to be in accordance with the preset link establishment condition, establishing a link with the called equipment by using the first test frequency point, wherein the first call frame is received by the called equipment through polling scanning a plurality of preset sub-bands of short waves, and the first call frame is of a first signaling type; the first signaling type comprises synchronization information of a plurality of preset sub-frequency bands; the first response frame is of a second signaling type, and the downlink channel quality of the first test frequency point is contained in a data field of the second signaling type.

In order to solve the technical problem, a second aspect of the present application provides a short wave link establishment method, which includes that a called device receives a first call frame sent by a calling device at a first test frequency point, wherein the first test frequency point is selected from a short wave available frequency point set; determining the downlink channel quality of a first test frequency point, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point; receiving a first confirmation frame sent by a calling device, and establishing a link with the calling device by using a first test frequency point, wherein the first confirmation frame is sent by the calling device after determining that the downlink channel quality and the uplink channel quality of the first test frequency point meet preset link establishment conditions, wherein the first call frame is received by a called device through polling scanning a plurality of preset sub-frequency bands of short waves, and the first call frame is of a first signaling type; the first signaling type comprises synchronization information of a plurality of preset sub-bands, the first response frame is of a second signaling type, and the downlink channel quality of the first test frequency point is contained in a data field of the second signaling type.

The beneficial effects of the application are as follows: compared with the prior art, the short wave link establishment method provided by the application is characterized in that the calling equipment selects a first test frequency point from a short wave available frequency point set, and transmits a first call frame in the first test frequency point, wherein the first call frame is of a first signaling type, and the first signaling type comprises synchronous information of a plurality of preset sub-frequency bands, so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame by carrying out polling scanning on the plurality of preset sub-frequency bands of the short wave, receives a first response frame fed back by the called equipment on the first test frequency point, and the first response frame is of a second signaling type, wherein the data field comprises the downlink channel quality of the first test frequency point, and acquires the uplink channel quality of the first test frequency point after receiving the first response frame, and further, when both the uplink channel quality and the downlink channel quality meet preset link establishment conditions, the first test frequency point and the called equipment are utilized to establish a link. According to the scheme, the influence of the characteristics of the transmission medium and the shortwave on the channel quality is comprehensively considered, and the uplink channel quality and the downlink channel quality are taken as factors of whether to build the link, so that when the uplink channel quality and the downlink channel quality of the first test frequency point meet the preset link building condition, the link is built by using the first test frequency point, the shortwave link building of the calling equipment and the called equipment is further realized, the communication quality of the calling equipment and the called equipment after the link building is ensured as much as possible, and smooth completion of communication by the two parties is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings required in the description of the embodiments will be briefly described below, it being obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a flow chart of an embodiment of a short wave link establishment method according to the present application;

FIG. 2 is a schematic diagram of a short-wave full-band division in one embodiment;

FIG. 3 is a schematic diagram of an embodiment of short-wave frequency bin division;

fig. 4 is a schematic diagram of a framework of an embodiment of a first signaling type;

fig. 5 is a schematic diagram of a framework of an embodiment of a second signaling type;

fig. 6 is a schematic diagram of a framework of an embodiment of a third signaling type;

FIG. 7 is a flow chart of another embodiment of the short wave link establishment method of the present application;

FIG. 8 is a flowchart illustrating an embodiment of step S712 in FIG. 7;

FIG. 9 is a flowchart of the step S11 in FIG. 1;

FIG. 10 is a flowchart illustrating an embodiment of step S92 in FIG. 9;

FIG. 11 is a flowchart illustrating an embodiment of step S921 in FIG. 10;

FIG. 12 is a flowchart of a short wave link establishment method according to another embodiment of the present application;

FIG. 13 is a flow chart of a short wave link establishment method according to another embodiment of the present application;

FIG. 14 is a flowchart of a short wave link establishment method according to another embodiment of the present application;

FIG. 15 is a schematic diagram of a frame of an embodiment of a communication device of the present application;

FIG. 16 is a schematic diagram of a frame of another embodiment of a communication device of the present application;

FIG. 17 is a schematic diagram of a frame of an embodiment of a storage device of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The short-wave link construction method of the present application is exemplified in two aspects below.

First aspect:

referring to fig. 1, fig. 1 is a flow chart of an embodiment of the short-wave link establishment method of the present application.

Specifically, the method comprises the following steps:

step S11: the calling device selects a first test frequency point from the shortwave available frequency point set.

The calling device may be a fixed station or a mobile station, such as a car-mounted station, a hand-held station, etc., and the embodiment is not particularly limited herein.

In one implementation, the set of shortwave available frequency points may be automatically generated by the calling device based on the starting frequency point and the step size. For example, the starting frequency point is selected according to the longitude and latitude, the current season, the current time and the like of the calling device and the called device. For example, the step size is selected according to the link establishment requirements of the calling device and the called device, such as 60kHz, 120kHz, 240kHz, specifically, when the link establishment environments of the calling device and the called device are the sky wave environments, the step size may be selected to be 60kHz, when the link establishment environments of the calling device and the called device are the ground wave environments, the step size may be selected to be 120kHz, 240kHz, etc., which is not exemplified here.

In another implementation scenario, the set of available frequency points of the short wave may also be generated by the calling device by sorting according to the signal-to-noise ratio of each frequency point of the short wave.

The first test frequency point may be a set-top frequency point in the shortwave available frequency point set, i.e. the first frequency point in the shortwave available frequency point set. When the short-wave available frequency point set is generated by the calling equipment according to the signal-to-noise ratio of each frequency point of the short waves, the frequency of the calling equipment for selecting the first test frequency point from the short-wave available frequency point set can be reduced as much as possible, and therefore the success rate of short-wave link establishment is improved.

Step S12: and sending the first call frame on the first test frequency point so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame.

The called device may be a fixed station or a mobile station, such as a car-mounted station, a hand-held station, etc., and the embodiment is not limited herein.

In one implementation scenario, the assessment of the downlink channel quality may include, but is not limited to, the following factors: signal-to-Noise Ratio (SNR), bit Error Ratio (BER), multipath fading (multi-path fading). Further, the signal-to-noise ratio, the bit error rate, and the weight of multipath fading in evaluating the quality of the downlink channel may each be 1/3. The present embodiment is not particularly limited herein. In one implementation scenario, the called device may receive the first call frame by performing a polling scan on a plurality of preset sub-bands of short waves.

In an implementation scenario, the first call frame may be of a first signaling type, and the first signaling type may include synchronization information of a plurality of preset sub-bands, specifically, synchronization information of different preset sub-bands is used for establishing synchronization connection between the calling device and the called device on frequency points in corresponding sub-bands. The specific signaling structure of the first signaling type is not described in detail herein.

Step S13: and receiving a first response frame fed back by the called equipment on the first test frequency point, wherein the first response frame comprises the downlink channel quality of the first test frequency point.

After obtaining the downlink channel quality of the first test frequency point, the called device feeds back a first response frame to the calling device, wherein the first response frame comprises the downlink channel quality, so that the calling device can analyze the first response frame after receiving the first response frame, and further the downlink channel quality of the first test frequency point is obtained. In one implementation scenario, the first response frame may be of a second signaling type, where the second signaling type may include a data field for storing channel quality, and in particular, the data field may include downlink channel quality of the first test frequency point. The specific signaling structure of the second signaling type is not described in detail herein.

Step S14: and obtaining the uplink channel quality of the first test frequency point.

In one implementation scenario, the evaluation of the uplink channel quality may include, but is not limited to, the following factors: signal-to-Noise Ratio (SNR), bit Error Ratio (BER), multipath fading (multi-path fading). Further, the weights of the signal-to-noise ratio, the bit error rate and the multipath fading in the evaluation of the uplink channel quality may each occupy 1/3. The present embodiment is not particularly limited herein.

Step S15: and judging whether the downlink channel quality and the uplink channel quality of the first test frequency point meet the preset link establishment condition, and if so, executing step S16.

In one implementation scenario, in order to evaluate whether the acquired uplink channel quality and downlink channel quality meet the service requirement, a preset uplink channel quality may be set for the uplink channel, and a preset downlink channel quality may be set for the downlink channel, where the preset link establishment condition is that the uplink channel quality of the first test frequency point is greater than the preset uplink channel quality, and the downlink channel quality of the first test frequency point is greater than the preset downlink channel quality.

In another implementation scenario, in order to further distinguish the requirements of the uplink channel and the downlink channel in different degrees on the traffic/data service based on whether the obtained uplink channel quality and the obtained downlink channel quality evaluate the service requirements, the preset uplink channel quality set for the uplink channel and the preset downlink channel quality set for the downlink channel may be different, for example, the service requirements of the uplink channel on the traffic/data are higher, and the service requirements of the downlink channel on the traffic/data are lower, and the preset uplink channel quality may be set to be greater than the preset downlink channel quality; alternatively, for example, if the traffic demand of the downlink channel on the traffic/data is higher, and the traffic demand of the uplink channel on the traffic/data is lower, the preset downlink channel quality may be set to be greater than the preset uplink channel quality, which is not particularly limited herein.

Step S16: and establishing a link with the called equipment by using the first test frequency point.

When the downlink channel quality and the uplink channel quality of the first test frequency point in the step S15 both meet the preset link establishment condition, the first test frequency point and the called equipment can be used for link establishment.

In one implementation scenario, in order to select the link establishment frequency point meeting the service requirement as soon as possible, so that the calling device and the called device implement communication connection, if the downlink channel quality and/or the uplink channel quality of the first test frequency point in the step S15 do not meet the preset link establishment condition, the following steps may be further executed:

step S17: and re-selecting the first test frequency point from the shortwave available frequency point set.

In one implementation scenario, when the set of available short-wave frequency points is automatically generated by the calling device according to the starting frequency point and the step size, the reselected first test frequency point is the next frequency point in the set of available short-wave frequency points, for example, the frequency point numbers of the set of available short-wave frequency points are sequentially: 1. 2, 3, 4, 5, then when the frequency number of the first test frequency point selected for the first time is 1, the frequency number of the first test frequency point selected for the next time is 2, and so on, the embodiment is not illustrated here one by one.

In another implementation scenario, when the set of available frequency points of the short wave is generated by the calling device according to the signal-to-noise ratio of each frequency point of the short wave, the reselected first test frequency point may be the next frequency point in the set of available frequency points of the short wave, for example, the frequency point numbers of the set of available frequency points of the short wave are in turn: 2. 4, 3, 1 and 5, when the frequency point number of the first test frequency point selected for the first time is 2, the frequency point number of the first test frequency point selected for the next time is 4; or when the set of available frequency points of the short wave is generated by the calling device according to the signal-to-noise ratio of each frequency point of the short wave, if the downlink channel quality and/or the uplink channel quality of the first test frequency point in the step S15 do not meet the preset link establishment condition, the set of available frequency points of the short wave can be generated again according to the signal-to-noise ratio of each frequency point of the short wave. The present embodiment is not particularly limited herein.

Step S18: the above step S12 and the subsequent steps are re-executed.

After the first test frequency point is reselected from the shortwave available frequency point set, the step S12 and the subsequent steps are re-executed until choose the link establishment frequency point meeting the service requirement is selected.

According to the scheme, the calling equipment selects the first test frequency point from the shortwave available frequency point set, the first call frame is sent at the first test frequency point, the first call frame is of a first signaling type, the first signaling type comprises synchronous information of a plurality of preset sub-frequency bands, so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame through polling scanning of the plurality of preset sub-frequency bands of the shortwave, receives a first response frame fed back by the called equipment on the first test frequency point, the first response frame is of a second signaling type, the data field of the first response frame comprises the downlink channel quality of the first test frequency point, and after receiving the first response frame, the uplink channel quality of the first test frequency point is acquired, and further when the uplink channel quality and the downlink channel quality both meet preset link establishment conditions, the uplink channel quality and the downlink channel quality of the called equipment are utilized, the influence of the characteristics of a transmission medium and the shortwave on the channel quality is comprehensively considered, the uplink channel quality and the downlink channel quality of the called equipment are taken as a factor, the uplink channel quality and the downlink channel quality of the first test frequency point can be successfully established, and the communication quality of the called equipment is not successfully established when the first channel quality and the first channel quality of the calling equipment is completely established.

In one embodiment, when the downlink channel quality and the uplink channel quality of the first test frequency point in the step S15 both meet the preset link establishment condition, in order to make the called terminal communicate with the calling terminal at the first test frequency point after the called terminal is clear, the step S16 may include sending a first acknowledgement frame to the called device at the first test frequency point, so as to complete link establishment with the called device at the first test frequency point.

In the above embodiment, the link establishment between the calling device and the called device is implemented through the three-way handshake between the calling device and the called device, and in another embodiment, in order to reduce the period duration of the three-way handshake, the short-wave full frequency band may be divided into a plurality of preset sub-frequency bands, so that the called device receives the first call frame by performing polling scanning on the plurality of preset sub-frequency bands of the short wave. Referring to fig. 2 and fig. 3 in combination, fig. 2 is a schematic diagram of a short-wave full-band division embodiment, and fig. 3 is a schematic diagram of a short-wave frequency division embodiment.

As shown in fig. 2, in this embodiment, the total bandwidth of 28MHz of the short-wave full frequency band (2 MHz-30 MHz) is calculated, according to the processing capability of the device for parallel processing 128 paths and the interval of 60kHz in each path, the short-wave full frequency band is divided into 4 preset sub-frequency bands theoretically, if the 4 preset sub-frequency bands are evenly divided, the bandwidth exceeding 28MHz is exceeded, and the filter design is considered to be reduced in the tail performance, so that the frequency non-even division is adopted, the problem is solved by overlapping, in one implementation scenario, the bandwidth of the head-tail preset sub-frequency band is 7.68M, and the bandwidth of the middle two preset sub-frequency bands is 6.84M. With continued reference to fig. 2, in one implementation scenario, when the called device performs polling in each preset sub-band, the signal is received with the receiving frequency point as the center frequency, for example, when the polling scanning is performed in the first preset sub-band in fig. 2, the signal is received with the 5.84MHz as the center frequency; in the second preset sub-band in fig. 2, the signal is received with a center frequency of 12.62MHz, and the like, which is not illustrated here.

In an implementation scenario, when the called device performs polling scanning on a plurality of preset sub-bands, the receiving frequency point of each preset sub-band may be used as a center frequency to process signals through radio frequency direct acquisition, and a specific scheme of radio frequency direct acquisition is a prior art in the field, which is not described herein in detail.

In this embodiment, as shown in fig. 3, the frequency point division is performed on the short-wave full-band with 9.6kHz as the reference frequency interval, as shown in fig. 3, the center frequency of the frequency point 7 is 2mhz+57.6khz, and the center frequency of the frequency point 14 is 2mhz+115.2khz, which is not an example any more.

Referring to fig. 4, fig. 4 is a schematic diagram of a framework of an embodiment of the first signaling type. The first call frame is a first signaling type, as shown in fig. 4, where the first signaling type includes synchronization information of a plurality of preset sub-bands. Specifically, the first signaling type may include a plurality of first synchronization fields corresponding to a plurality of preset sub-bands of the short wave, respectively. In one implementation scenario, when the device adopts an FPGA (Field-Programmable Gate Array, field programmable gate array) +dsp (Digital Signal Processor ) architecture, coarse synchronization is often completed through the FPGA, and fine synchronization is completed through the DSP, so that the FPGA needs to buffer processed data and then transmit the buffered data to the DSP, thereby ensuring that the FPGA cannot miss in the process of transmitting the data to the DSP, however, buffering the data causes waste on storage resources of the device, and in order to save storage resources, two first synchronization fields corresponding to each preset sub-band in the first signaling type may be set, so that when the short-wave full-band is divided into 4 preset sub-bands as shown in fig. 2, the first signaling type may specifically include 8 first synchronization fields. In one implementation, the first synchronization field is a string of random codes. The first synchronization field is used for the called device to synchronize with the calling device when the called device scans the corresponding sub-band. The first signaling type may further include a second synchronization field for synchronization in decoding the data field and the data field. The data field of the first call frame includes a call address of the called device, such that the called device, upon determining that the call address is itself, responds to the first call frame to feed back a first answer frame. In one implementation scenario, the first signaling type further includes a guard interval field for a guard interval of the data.

Furthermore, referring to fig. 5, fig. 5 is a schematic diagram of a framework of an embodiment of the second signaling type. The first response frame is of a second signaling type, the second signaling type comprises a second synchronization field and a data field, and the second synchronization field is used for synchronizing when decoding the data field. In one implementation scenario, the second signaling type further includes a guard interval field for a guard interval of the data. The downlink channel quality of the first test frequency point is contained in a data field of the second signaling type. In addition, the first acknowledgement frame is of the second signaling type. It follows that the second signalling type takes up less time than the first signalling type.

In the three-way handshake of the calling device and the called device, the first call frame sent by the calling device to the called device is of the first signaling type, the first response frame fed back by the called device to the calling device is of the second signaling type, the calling device confirms that the first acknowledgement frame sent by the first test frequency point for link establishment is also of the second signaling type, the lengths of the first signaling type and the second signaling type are different, and the length of the second signaling type is smaller than that of the first signaling type, so that the channel residence time can be shortened to the greatest extent, the time for link establishment between the calling device and the called device can be shortened, the link establishment speed can be accelerated, and the link establishment efficiency can be improved.

In addition, by transmitting the first call frame in the first signaling type including the first synchronization field, the calling device and the called device can be synchronized even when they are in an asynchronous system, without being limited by GPS (Global Positioning System ).

Referring to fig. 7, fig. 7 is a flow chart of another embodiment of the short-wave link establishment method according to the present application. Specifically, the method may include the steps of:

step S701: the calling device selects a first test frequency point from the shortwave available frequency point set.

See step S11.

Step S702: and sending the first call frame on the first test frequency point so that the called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame.

See step S12 described above.

Step S703: and receiving a first response frame fed back by the called equipment on the first test frequency point, wherein the first response frame comprises the downlink channel quality of the first test frequency point.

After obtaining the downlink channel quality of the first test frequency point, the called device feeds back a first response frame to the calling device, wherein the first response frame comprises the downlink channel quality, so that the calling device can analyze the first response frame after receiving the first response frame, and further the downlink channel quality of the first test frequency point is obtained.

Step S704: and obtaining the uplink channel quality of the first test frequency point.

Step S705: and judging whether the downlink channel quality and the uplink channel quality of the first test frequency point meet the preset link establishment condition, and if so, executing step S706.

See step S15 described above.

Step S706: and establishing a link with the called equipment by using the first test frequency point.

When the up-down channel quality and the up-down channel quality of the first test frequency point in the step S705 meet the preset link establishment condition, the first test frequency point and the called device can be used to establish a link.

In this embodiment, in order to select the link establishment frequency point meeting the service requirement as soon as possible choose, if the downlink channel quality and/or the uplink channel quality of the first test frequency point in the step S705 do not meet the preset link establishment condition, the following steps S707 to S708 may be further executed:

step S707: and re-selecting the first test frequency point from the shortwave available frequency point set.

See step S17 described above.

Step S708: the above step S702 and the subsequent steps are re-executed.

After the first test frequency point is reselected from the shortwave available frequency point set, the step S702 and the subsequent steps are re-executed until choose the link establishment frequency point meeting the service requirement is selected.

In this embodiment, after the calling device and the called device quickly establish the connection link through the above steps by three handshakes, the method may further include:

step S709: and respectively transmitting second call frames at a preset number of second test frequency points before and after the first test frequency points, so that the called equipment selects second test frequency points which accord with preset channel conditions from the preset number of second test frequency points after receiving the second call frames.

In one implementation scenario, the preset number may be set according to the shortwave channel characteristics and the device processing resources, for example, the preset number may be 16, 32, etc., which is not illustrated here.

In one implementation scenario, in order to select a frequency point with optimal channel quality from the second test frequency points, the preset channel condition may be the second test frequency point with optimal downlink channel quality.

Step S710: and receiving a second response frame fed back by the called equipment on the first test frequency point and a third response frame fed back by the called equipment on the selected second test frequency point.

In one implementation scenario, the second acknowledgement frame and the third acknowledgement frame are of the second signaling type. The second signaling type may be specifically referred to in fig. 5 and the foregoing embodiments, and this embodiment is not described herein again.

In one implementation scenario, step S710 in this embodiment may specifically include: and receiving a second response frame fed back by the called equipment on the first test frequency point and a third response frame fed back on the selected second test frequency point by taking the first test frequency point as a central frequency point.

Step S711: and obtaining the channel quality of the first test frequency point based on the second response frame, and obtaining the channel quality of the selected second test frequency point based on the third response frame.

In one implementation scenario, the data field in the second response frame fed back by the called device includes the downlink channel quality of the first test frequency point, and the data field in the third response frame includes the downlink channel quality of the selected second test frequency point, so that the calling device obtains the downlink channel quality of the first test frequency point based on the second response frame, and obtains the downlink channel quality of the selected second test frequency point based on the third response frame.

In one implementation scenario, step S711 in this embodiment may specifically include: and based on the second response frame, obtaining the uplink channel quality and the downlink channel quality of the first test frequency point, and based on the third response frame, obtaining the uplink channel quality and the downlink channel quality of the selected second test frequency point.

Step S712: and selecting a final link establishment frequency point from the first test frequency point and the selected second test frequency point based on the channel quality of the first test frequency point and the channel quality of the selected second test frequency point.

In one implementation scenario, the calling device may select, as the final link establishment frequency point, the frequency point corresponding to the best one of the downlink channel quality of the first test frequency point included in the second response frame and the downlink channel quality of the selected second test frequency point included in the third response frame.

In another implementation scenario, referring to fig. 8 in combination, step S712 in this embodiment may specifically include:

step S7121: and acquiring the first comprehensive channel quality based on the uplink channel quality and the downlink channel quality of the first test frequency point.

In one implementation scenario, weights of the uplink channel quality and the downlink channel quality may be determined according to priorities of the uplink traffic and the downlink traffic, and then a weighting operation may be performed on the uplink channel quality and the downlink channel quality, so as to obtain a first comprehensive channel quality. For example, if the priorities of the uplink service and the downlink service are equal, it may be determined that the weight of the uplink channel quality is 0.5, and the weight of the downlink channel quality is also 0.5; or the priority of the uplink service is slightly higher than that of the downlink service, the weight of the uplink channel quality can be determined to be 0.6, and the weight of the downlink channel quality is 0.4, which is not exemplified here.

Step S7122: and acquiring second comprehensive channel quality based on the uplink channel quality and the downlink channel quality of the selected second test frequency point.

In one implementation scenario, weights of the uplink channel quality and the downlink channel quality may be determined according to priorities of the uplink traffic and the downlink traffic, and then a weighting operation may be performed on the uplink channel quality and the downlink channel quality, so as to obtain a second comprehensive channel quality. For example, if the priorities of the uplink service and the downlink service are equal, it may be determined that the weight of the uplink channel quality is 0.5, and the weight of the downlink channel quality is also 0.5; or the priority of the uplink service is slightly higher than that of the downlink service, the weight of the uplink channel quality can be determined to be 0.6, and the weight of the downlink channel quality can be determined to be 0.4.

Step S7123: and selecting a final link establishment frequency point from the first test frequency point and the selected second test frequency point by determining the corresponding frequency point with better channel quality in the first comprehensive channel quality and the second comprehensive channel quality.

And selecting the corresponding frequency point with better channel quality in the first comprehensive channel quality and the second comprehensive channel quality, and taking the frequency point as a final link establishment frequency point.

The above-mentioned step S7121 and step S7122 are performed in no order, for example: step S7121 is performed first, and step S7122 is performed later; or, step S7122 is performed first, and then step S7121 is performed; or step S7121 and step S7122 are performed simultaneously, the present embodiment is not particularly limited herein.

Step S713: and re-using the final link establishment frequency point and the called equipment to establish a link.

And re-using the final link establishment frequency point and the called equipment to establish a link. In an implementation scenario, the step S713 may specifically include sending a second acknowledgement frame to the called device at the final link establishment frequency point, so as to complete the link establishment with the called device at the final link establishment frequency point.

In one implementation scenario, in order to obtain synchronization information required for a predetermined number of second test frequency points before and after the first test frequency point, the second call frame may be of a third signaling type, and referring to fig. 6, fig. 6 is a schematic diagram of a frame of an embodiment of the third signaling type. The third signaling type comprises synchronization information corresponding to a preset sub-band where the second test frequency point is located. In one implementation scenario, the third signaling type specifically includes a first synchronization field corresponding to a preset sub-band, and a second synchronization field and a data field. In one implementation scenario, when the device adopts an FPGA (Field-Programmable Gate Array, field programmable gate array) +dsp (Digital Signal Processor ) architecture, coarse synchronization is often completed through the FPGA, and fine synchronization is completed through the DSP, so that the FPGA needs to buffer the processed data and then transmit the buffered data to the DSP, thereby ensuring that the FPGA cannot miss in the process of transmitting the data to the DSP, however, the buffered data wastes the storage resources of the device, and in order to save the storage resources, the third signaling type may specifically set two first synchronization fields corresponding to the preset sub-bands.

In addition, the third signaling type may further include a guard interval field for a guard interval of the data. It follows that the length of time occupied by the third signalling type is smaller than the length of time occupied by the first signalling type.

According to the scheme, after the calling device and the called device quickly establish a connection link at the first test frequency point through three-way handshake, the second call frame is sent at the second test frequency points with the preset number before and after the first test frequency point, so that the second test frequency point which accords with the preset channel condition is selected, the final link establishment frequency point is selected from the selected second test frequency point and the first test frequency point based on the channel quality of the selected second test frequency point and the channel quality of the first test frequency point, and therefore the frequency point with the optimal channel quality in the local frequency point can be further selected to carry out final link establishment on the basis of realizing quick link establishment, and further the communication quality of both the calling device and the called device is further improved.

Referring to fig. 9, fig. 9 is a flowchart illustrating an embodiment of step S11 in fig. 1. Specifically, step S11 may include:

step S91: and acquiring a shortwave available frequency point set.

Specifically, the set of available frequency points for short waves can be obtained based on a preset starting frequency point and a frequency step.

Step S92: and sequentially selecting a first test frequency point from the shortwave available frequency point set.

Specifically, the first test frequency point may be selected according to a sequence in the shortwave frequency point set obtained based on the preset starting frequency point and the frequency step.

In addition, referring to fig. 10 in combination, fig. 10 is a schematic flow chart of an embodiment of step S92 in fig. 9, and step S92 may be implemented by the following steps:

step S921: and ordering the frequency points in the shortwave available frequency point set according to the order of the signal to noise ratio of each frequency point.

Specifically, referring to fig. 11 in combination, fig. 11 is a flowchart illustrating an embodiment of step S921 in fig. 10, where step S921 may specifically include:

step S9211: and acquiring the real-time signal-to-noise ratio of each frequency point of the shortwave available frequency point set and the historical signal-to-noise ratio of each frequency point.

The real-time signal-to-noise ratio is the current signal-to-noise ratio of each frequency point, and the historical signal-to-noise ratio is the signal-to-noise ratio of the historical communication of each frequency point.

Step S9212: a first weight of the real-time signal-to-noise ratio and a second weight of the historical signal-to-noise ratio are determined.

In one implementation scenario, in order to distinguish the priority of the real-time signal-to-noise ratio and the historical signal-to-noise ratio to the selection of the first test frequency point when the calling device is a mobile station or a fixed station, when the calling device is a mobile station, the ratio of the first weight to the second weight is greater than 1, that is, the first weight of the real-time signal-to-noise ratio is greater than the second weight of the historical signal-to-noise ratio; when the calling device is a fixed station, the ratio of the first weight to the second weight is less than 1, that is, the first weight of the real-time signal-to-noise ratio is less than the second weight of the historical signal-to-noise ratio.

Step S9213: and carrying out weighting operation on the real-time signal-to-noise ratio and the historical signal-to-noise ratio by using the first weight and the second weight, and arranging frequency points of the shortwave available frequency point set according to the sequence from large to small of the weighting result.

In one implementation scenario, when the first weight and the second weight are greater than 1, the weighted calculation performed on the real-time signal-to-noise ratio and the historical signal-to-noise ratio by using the first weight and the second weight may be a weighted average; in another implementation scenario, when the first weight and the second weight are smaller than 1, the weighted calculation performed on the real-time snr and the historical snr by using the first weight and the second weight may be a weighted sum, which is not limited herein.

Step S922: and selecting the frequency points in the short-wave available frequency point set as the first test frequency points according to the ordering in the short-wave available frequency point set.

When the frequency points in the shortwave available frequency point set are ordered according to the signal-to-noise ratio sequence of each frequency point, the first test frequency point can be selected according to the ordering of each frequency point in the shortwave available frequency point set.

Second aspect:

referring to fig. 12, fig. 12 is a flowchart of a short-wave link establishment method according to another embodiment of the application. Specifically, it may include:

Step S1210: the called equipment receives a first call frame sent by the calling equipment at a first test frequency point, wherein the first test frequency point is obtained by selecting from a shortwave available frequency point set.

The called device can be a fixed station or a mobile station, such as a vehicle-mounted station, a hand station and the like; the calling device may be a fixed station or a mobile station, such as a car-mounted station, a hand-held station, etc., and the embodiment is not particularly limited herein.

In another implementation scenario, the set of available frequency points of the short wave may also be generated by the calling device according to the signal-to-noise ratio of each frequency point of the short wave.

The first test frequency point may be a set-top frequency point in the shortwave available frequency point set, i.e. the first frequency point in the shortwave available frequency point set. Therefore, when the short-wave available frequency point set can also be generated by the calling equipment according to the signal-to-noise ratio of each frequency point of the short waves, the frequency of the calling equipment for selecting the first test frequency point from the short-wave available frequency point set can be reduced as much as possible, and the success rate of short-wave link establishment is improved. In one implementation scenario, the first call frame is received by the called device by polling a plurality of preset sub-bands of short waves. In another implementation scenario, the first call frame may be of a first signaling type, where the first signaling type may include synchronization information of a plurality of preset sub-bands, and specifically, the synchronization information of different preset sub-bands may be used for the calling device and the called device to establish synchronization connection on frequency points in corresponding sub-bands. The specific signaling structure of the first signaling type may refer to the foregoing embodiments, and will not be described herein.

Step S1220: determining the downlink channel quality of the first test frequency point, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point.

In one implementation scenario, the assessment of the downlink channel quality may include, but is not limited to, the following factors: signal-to-Noise Ratio (SNR), bit Error Ratio (BER), multipath fading (multi-path fading). Further, the signal-to-noise ratio, the bit error rate, and the weight of multipath fading in evaluating the quality of the downlink channel may each be 1/3. The present embodiment is not particularly limited herein. In one implementation scenario, the first response frame may be of a second signaling type, and the second response frame may include a data field for storing channel quality, and in particular, the data field may include downlink channel quality of the first test frequency point. The specific signaling structure of the second signaling type may refer to the foregoing embodiments, and will not be described herein.

Step S1230: and receiving a first confirmation frame sent by the calling equipment, and establishing a link with the calling equipment by using the first test frequency point, wherein the first confirmation frame is sent by the calling equipment after determining that the downlink channel quality and the uplink channel quality of the first test frequency point meet the preset link establishment condition.

In another implementation scenario, in order to further distinguish between different degree requirements of the uplink channel and the downlink channel on the traffic/data service based on whether the obtained uplink channel quality and downlink channel quality are evaluated to meet the service requirement, the preset uplink channel quality set for the uplink channel and the preset downlink channel quality set for the downlink channel may be different, for example, the service requirement of the uplink channel on the traffic/data is higher, and the service requirement of the downlink channel on the traffic/data is lower, the preset uplink channel quality may be set to be greater than the preset downlink channel quality; alternatively, for example, if the traffic demand of the downlink channel on the traffic/data is higher, and the traffic demand of the uplink channel on the traffic/data is lower, the preset downlink channel quality may be set to be greater than the preset uplink channel quality, which is not particularly limited herein.

According to the scheme, the influence of the characteristics of the transmission medium and the shortwave on the channel quality is comprehensively considered, and the uplink channel quality and the downlink channel quality are taken as factors of whether to build the link, so that when the uplink channel quality and the downlink channel quality of the first test frequency point meet the preset link building condition, the link is built by using the first test frequency point, the shortwave link building of the calling equipment and the called equipment is further realized, the communication quality of the calling equipment and the called equipment after the link building is ensured as much as possible, and smooth completion of communication by the two parties is facilitated.

In an embodiment, the step S1210 may specifically include performing a polling scan on a plurality of preset sub-bands of the short wave to scan for a first call frame sent by the calling device at a first test frequency point. Specifically, the manner of dividing the short-wave full frequency band into a plurality of preset sub-frequency bands may refer to the embodiment of the first aspect, which is not described herein again.

In another embodiment, the "transmitting the first response frame including the downlink channel quality of the first test frequency point at the first test frequency point" in the step S1220 specifically includes: switching to a narrowband mode, and transmitting a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point. The first response frame is of a second signaling type, and the downlink channel quality of the first test frequency point is contained in a data field of the second signaling type. For the second signaling type, reference may be made specifically to the embodiment in the first aspect, and this embodiment is not described herein again.

Referring to fig. 13, fig. 13 is a flowchart of a short-wave link establishment method according to another embodiment of the application. Specifically, the method may include the steps of:

step S1310: the called equipment receives a first call frame sent by the calling equipment at a first test frequency point, wherein the first test frequency point is obtained by selecting from a shortwave available frequency point set.

In detail, please refer to step S1210 in the foregoing embodiment.

The first call frame is a first signaling type, and the first signaling type includes synchronization information of a plurality of preset sub-bands. In particular, reference may be made to the embodiment in the first aspect, which is not described herein.

Step S1320: and selecting the synchronization information of the preset sub-frequency band corresponding to the first test frequency point from the synchronization information of a plurality of preset sub-frequency bands contained in the first call frame, and synchronizing with the calling equipment through the selected synchronization information.

The synchronization information of the plurality of preset sub-bands may be specifically referred to an embodiment in the first aspect, which is not described herein.

Step S1330: and judging whether the calling address in the first calling frame is matched with the self address. If yes, go to step S1340, otherwise, go to step S1370.

In an implementation scenario, the call address is located in a data field of the first signaling type, and the data field of the first signaling type may refer to the embodiment in the first aspect, which is not described herein again.

Step S1340: and determining the opposite terminal called by the calling equipment.

When the calling address in the first calling frame is matched with the self address, the opposite terminal called by the calling device is confirmed to be the local device.

Step S1350: determining the downlink channel quality of the first test frequency point, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point.

Specifically, reference may be made to step S1220 in the foregoing embodiment.

Step S1360: and receiving a first confirmation frame sent by the calling equipment, and establishing a link with the calling equipment by using the first test frequency point, wherein the first confirmation frame is sent by the calling equipment after determining that the downlink channel quality and the uplink channel quality of the first test frequency point meet the preset link establishment condition.

Specifically, reference may be made to step S1230 in the foregoing embodiment.

Step S1370: step S1310 and subsequent steps are re-executed.

When the call address in the first call frame does not match with the address of the calling device, it is indicated that the opposite end called by the calling device is not the local device, and the step S1310 and the subsequent steps are re-executed, specifically, the polling scanning can be continuously performed on a plurality of preset sub-bands of the short wave so as to scan the first call frame sent by the calling device at the first test frequency point.

Referring to fig. 14, fig. 14 is a flowchart of a short-wave link establishment method according to another embodiment of the application. Specifically, the method may include the steps of:

Step S1410: the called equipment receives a first call frame sent by the calling equipment at a first test frequency point, wherein the first test frequency point is obtained by selecting from a shortwave available frequency point set.

Specifically, reference may be made to step S1210 in the foregoing embodiment.

Step S1420: determining the downlink channel quality of the first test frequency point, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point.

Specifically, reference may be made to step S1220 in the foregoing embodiment.

Step S1430: and receiving a first confirmation frame sent by the calling equipment, and establishing a link with the calling equipment by using the first test frequency point, wherein the first confirmation frame is sent by the calling equipment after determining that the downlink channel quality and the uplink channel quality of the first test frequency point meet the preset link establishment condition.

Specifically, reference may be made to step S1230 in the foregoing embodiment.

In this embodiment, the first call frame is of a first signaling type, where the first signaling type includes a plurality of first synchronization fields, a plurality of second synchronization fields, and a plurality of data fields corresponding to a plurality of preset sub-bands of short waves, respectively; the first call frame is used for providing the called equipment with polling scanning for a plurality of preset sub-bands; the first synchronization field is used for synchronizing the called equipment with the calling equipment when the called equipment scans the corresponding preset sub-frequency band, the second synchronization field is used for synchronizing when the data field is decoded, and the data field in the first call frame comprises the call address of the called equipment, so that the called equipment responds to the first call frame and feeds back a first response frame when the call address is determined to be the called equipment. In addition, the second acknowledgement frame and the third acknowledgement frame, the second acknowledgement frame being of a second signaling type, the second signaling type comprising a second synchronization field and a data field. The first signaling type and the second signaling type may be specifically referred to embodiments in the first aspect, and this embodiment is not described herein.

On this basis, in order to optimize the quality of the communication link between the calling device and the called device, the method may further include:

step S1440: and respectively receiving a preset number of second test frequency points before and after the first test frequency point by the calling equipment to send a second call frame by taking the first test frequency point as a center frequency point.

In this embodiment, the second call frame is of a third signaling type, and the third signaling type includes synchronization information corresponding to a preset sub-band where the second test frequency point is located. For the third signaling type, reference may be made specifically to the embodiment of the first aspect, and this embodiment is not described herein again.

Step S1450: and selecting second test frequency points which meet preset channel conditions from a front preset number and a rear preset number of second test frequency points.

Step S1460: and the second response frame is transmitted on the first test frequency point and the third response frame is transmitted on the selected second test frequency point.

In one implementation scenario, the second acknowledgement frame and the third acknowledgement frame are of the second signaling type. The second signaling type may specifically refer to the embodiment of the first aspect, and this embodiment is not described herein again.

In this embodiment, the second acknowledgement frame and the third acknowledgement frame, and the second acknowledgement frame are of the second signaling type. For the second signaling type, reference may be made specifically to the embodiment of the first aspect, which is not described herein.

Step S1470: and receiving a second confirmation frame sent by the calling equipment at a final link establishment frequency point, and establishing a link with the calling equipment by utilizing the final link establishment frequency point, wherein the final link establishment frequency point is selected from the first test frequency point and the selected second test frequency point by the calling equipment according to the channel quality of the first test frequency point and the selected second test frequency point.

In this embodiment, the second acknowledgement frame is of a second signaling type, and the second signaling type can be specifically referred to the embodiment in the first aspect, which is not described herein again.

The manner in which the calling device selects the final link establishment frequency point from the first test frequency point and the selected second test frequency point according to the channel quality of the first test frequency point and the selected second test frequency point may be according to the downlink channel quality of the first test frequency point and the selected second test frequency point, or may be a first integrated channel quality combined with the first test frequency point and a second integrated channel quality combined with the selected second test frequency point, where the first integrated channel quality is obtained by combining the downlink channel quality and the uplink channel quality of the first test frequency point, and the second integrated channel quality is obtained by combining the downlink channel quality and the uplink and downlink channel quality of the second test frequency point.

Referring to fig. 15, fig. 15 is a schematic diagram of a frame of a communication device 1500 according to an embodiment of the application. Specifically, the communication apparatus 1500 includes a processor 1510, a communication circuit 1520 coupled to the processor 1510, and a memory 1530, wherein the processor 1510 is configured to execute program instructions in the memory 1530 to implement the short wave chaining method of the first aspect in conjunction with the communication circuit 1520.

The processor 1510 is configured to control the communication circuit 1520, the memory 1530, and itself, to implement the steps of the short wave chaining method in any of the embodiments of the first aspect described above. The processor 1510 may also be referred to as a CPU (Central Processing Unit ). Processor 1510 may be an integrated circuit chip having signal processing capabilities. The processor 1510 may also be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. In addition, the processor 1510 may be commonly implemented by a plurality of integrated circuit chips.

In this embodiment, the processor 1510 is configured to control the communication circuit 1520 to select a first test frequency point from a set of available short-wave frequency points, the processor 1510 is further configured to control the communication circuit 1520 to send a first call frame on the first test frequency point, so that the called device determines a downlink channel quality of the first test frequency point after receiving the first call frame, the processor 1510 is further configured to control the communication circuit 1520 to receive a first response frame fed back by the called device on the first test frequency point, where the first response frame includes the downlink channel quality of the first test frequency point, the processor 1510 is further configured to obtain an uplink channel quality of the first test frequency point, and if it is determined that the downlink channel quality and the uplink channel quality of the first test frequency point both meet a preset link establishment condition, the first call frame is established by using the first test frequency point and the called device, where the first call frame is received by performing polling scanning on a plurality of preset sub-bands of the short-wave devices and the first call frame is of the first signaling type; the first signaling type comprises synchronization information of a plurality of preset sub-frequency bands; the first response frame is of a second signaling type, and the downlink channel quality of the first test frequency point is contained in a data field of the second signaling type.

In some embodiments, the processor 1510 is further configured to reselect the first test frequency point from the shortwave available frequency point set and perform a subsequent step of selecting the first test frequency point if it is determined that the downlink channel quality and/or the uplink channel quality of the first test frequency point do not meet the preset link establishment condition.

In some embodiments, the processor 1510 is configured to control the communication circuit 1520 to send a first acknowledgement frame to the called device at a first test frequency point to complete the link establishment with the called device at the first test frequency point, where the first acknowledgement frame is of a second signaling type, and the preset link establishment condition is that an uplink channel quality of the first test frequency point is greater than a preset uplink channel quality, and a downlink channel quality of the first test frequency point is greater than a preset downlink channel quality.

In some embodiments, the processor 1510 is configured to control the communication circuit 1520 to send a second call frame at a preset number of second test frequency points before and after the first test frequency point, so that the called device selects a second test frequency point meeting a preset channel condition at the preset number of second test frequency points before and after receiving the second call frame, the processor 1510 is configured to control the communication circuit 1520 to receive a second response frame fed back by the called device at the first test frequency point and a third response frame fed back at the selected second test frequency point, the processor 1510 is configured to obtain a channel quality of the first test frequency point based on the second response frame, and obtain a channel quality of the selected second test frequency point based on the third response frame, the processor 1510 is configured to select a final link establishment frequency point from the first test frequency point and the selected second test frequency point, and the processor 1510 is configured to control the communication circuit 1520 to reuse a final link establishment response and the called device link, wherein the second response frame and the third response frame are of the second signaling type; the second call frame is of a third signaling type, and the third signaling type comprises synchronization information of a preset sub-frequency band corresponding to the second test frequency point.

In some embodiments, the processor 1510 is configured to control the communication circuit 1520 to receive, with the first test frequency point as a center frequency point, a second response frame fed back by the called device on the first test frequency point and a third response frame fed back on the selected second test frequency point.

In some embodiments, the processor 1510 is configured to obtain, based on the second response frame, an uplink channel quality and a downlink channel quality of the first test frequency point, and obtain, based on the third response frame, an uplink channel quality and a downlink channel quality of the selected second test frequency point, where the processor 1510 is further configured to obtain a first integrated channel quality based on the uplink channel quality and the downlink channel quality of the first test frequency point; and acquiring a second integrated channel quality based on the uplink channel quality and the downlink channel quality of the selected second test frequency point, where the processor 1510 is further configured to select a final link establishment frequency point from the first test frequency point and the selected second test frequency point by determining a frequency point corresponding to the first integrated channel quality and the second integrated channel quality with a better channel quality.

In some embodiments, the preset channel conditions include: the processor 1510 is further configured to control the communication circuit 1520 to send a second acknowledgement frame to the called device at the final link establishment frequency point to complete the link establishment with the called device at the final link establishment frequency point, where the second acknowledgement frame is of a second signaling type.

In some embodiments, the first signaling type includes a plurality of first synchronization fields, a plurality of second synchronization fields, and a plurality of data fields respectively corresponding to a plurality of preset sub-bands of short waves; the first call frame is used for providing the called equipment with polling scanning for a plurality of preset sub-bands; the first synchronous field is used for synchronizing the called equipment with the calling equipment when the called equipment scans the corresponding preset sub-frequency band, the second synchronous field is used for synchronizing when the data field is decoded, and the data field in the first call frame comprises the call address of the called equipment, so that the called equipment responds to the first call frame and feeds back a first response frame when the call address is determined to be the called equipment; the second signaling type includes a second synchronization field and a data field; the third signaling type includes a first synchronization field, a second synchronization field, and a data field corresponding to a predetermined frequency sub-band.

In some embodiments, the processor 1510 is further configured to obtain a set of shortwave available frequency points; and sequentially selecting a first test frequency point from the shortwave available frequency point set.

In some embodiments, the processor 1510 is further configured to obtain a set of shortwave available frequency points based on the preset starting frequency point and the frequency step size.

In some embodiments, the processor 1510 is further configured to rank the frequency points in the set of available frequency points of the short wave according to the order of signal to noise ratio of each frequency point, and the processor 1510 is further configured to select the frequency point in the set of available frequency points of the short wave as the first test frequency point according to the rank in the set of available frequency points of the short wave.

In some embodiments, the processor 1510 is further configured to obtain a real-time signal-to-noise ratio of each frequency point of the shortwave available frequency point set and a historical signal-to-noise ratio of each frequency point, the processor 1510 is further configured to determine a first weight of the real-time signal-to-noise ratio and a second weight of the historical signal-to-noise ratio, and the processor 1510 is further configured to perform a weighted operation on the real-time signal-to-noise ratio and the historical signal-to-noise ratio by using the first weight and the second weight, and arrange the frequency points of the shortwave available frequency point set according to a sequence from the large to the small of the weighted result, where when the calling device is a mobile station, a ratio of the first weight to the second weight is greater than 1, and when the calling device is a fixed station, a ratio of the first weight to the second weight is less than 1.

Referring to fig. 16, fig. 16 is a schematic diagram illustrating a frame of a communication device 1600 according to another embodiment of the application. Specifically, the communication device 1600 includes a processor 1610, a communication circuit 1620 coupled to the processor 1610, and a memory 1630, where the processor 1610 is configured to execute program instructions in the memory 1630 to implement the short-wave link establishment method in combination with the communication circuit 1620.

The processor 1610 is configured to control the communication circuit 1620, the memory 1630 and itself to implement the steps of the short wave link establishment method in any of the embodiments of the second aspect described above. Processor 1610 may also be referred to as a CPU (Central Processing Unit ). Processor 1610 may be an integrated circuit chip with signal processing capabilities. Processor 1610 may also be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. In addition, processor 1610 may be commonly implemented by a plurality of integrated circuit chips.

In this embodiment, the processor 1610 is configured to control the communication circuit 1620 to receive a first call frame sent by the calling device at a first test frequency point, where the first test frequency point is selected from a shortwave available frequency point set, the processor 1610 is further configured to determine downlink channel quality of the first test frequency point, control the communication circuit 1620 to send a first response frame including the downlink channel quality of the first test frequency point at the first test frequency point, and the processor 1510 is configured to control the communication circuit 1620 to receive a first acknowledgement frame sent by the calling device, and build a link with the calling device by using the first test frequency point, where the first acknowledgement frame is sent by the calling device when determining that the downlink channel quality and the uplink channel quality of the first test frequency point both meet preset link establishment conditions, where the first call frame is received by the called device through performing polling scanning on a plurality of preset sub-bands of shortwaves, and the first call frame is of a first signaling type; the first signaling type comprises synchronization information of a plurality of preset sub-bands, the first response frame is of a second signaling type, and the downlink channel quality of the first test frequency point is contained in a data field of the second signaling type.

In some embodiments, the processor 1610 is further configured to select synchronization information of a preset sub-band corresponding to the first test frequency point from synchronization information of a plurality of preset sub-bands included in the first call frame, synchronize with the calling device through the selected synchronization information, and determine whether a call address in the first call frame matches with an address of the calling device, if yes, determine that the calling device is an opposite end called by the calling device, and control the communication circuit 1620 to perform determining downlink channel quality of the first test frequency point and subsequent steps.

In some embodiments, the processor 1610 is further configured to control the communication circuit 1620 to switch to the narrowband mode and transmit a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point.

In some embodiments, the processor 1610 is further configured to control the communication circuit 1620 to receive, with the first test frequency point as a center frequency point, a second call frame sent by the calling device at a preset number of second test frequency points before and after the first test frequency point, and the processor 1610 is further configured to select a second test frequency point meeting a preset channel condition from the preset number of second test frequency points before and after, and the processor 1610 is further configured to control a second response frame sent by the communication circuit 1620 at the first test frequency point and a third response frame sent at the selected second test frequency point, and the processor 1610 is further configured to control the communication circuit 1620 to receive a second acknowledgement frame sent by the calling device at a final link establishment frequency point, and establish a link with the calling device by using the final link establishment frequency point, where the final link establishment frequency point is selected from the first test frequency point and the selected second test frequency point according to channel quality of the first test frequency point and the selected second test frequency point, and the second acknowledgement frame is of a second signaling type; the second call frame is of a third signaling type, and the third signaling type comprises synchronization information of a preset sub-frequency band corresponding to the second test frequency point.

Referring to fig. 17, fig. 17 is a schematic diagram illustrating a frame of a storage device 1700 according to an embodiment of the application. The storage 1700 stores program instructions 1710 that can be executed by a processor, where the program instructions 1710 are configured to implement steps in any of the short-wave link establishment method embodiments of the first aspect or implement steps in any of the short-wave link establishment method embodiments of the second aspect.

The above scheme not only realizes the short wave link establishment of the calling equipment and the called equipment, but also ensures the communication quality of the calling equipment and the called equipment after link establishment as much as possible, thereby being beneficial to the smooth completion of communication of the two parties.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical, or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Claims

1. The short wave link establishment method is characterized by comprising the following steps of:

the calling equipment selects a first test frequency point from a shortwave available frequency point set;

transmitting a first call frame on the first test frequency point so that called equipment determines the downlink channel quality of the first test frequency point after receiving the first call frame;

receiving a first response frame fed back by the called equipment on the first test frequency point, wherein the first response frame comprises the downlink channel quality of the first test frequency point;

obtaining the uplink channel quality of the first test frequency point;

if the downlink channel quality and the uplink channel quality of the first test frequency point are determined to be in accordance with the preset link establishment condition, establishing a link with the called equipment by using the first test frequency point;

respectively sending second call frames at a preset number of second test frequency points before and after the first test frequency points, so that the called equipment selects second test frequency points which accord with preset channel conditions from the preset number of second test frequency points after receiving the second call frames;

receiving a second response frame fed back by the called equipment on the first test frequency point and a third response frame fed back by the called equipment on the selected second test frequency point;

Obtaining the channel quality of the first test frequency point based on the second response frame, and obtaining the channel quality of the selected second test frequency point based on the third response frame;

selecting a final link establishment frequency point from the first test frequency point and the selected second test frequency point based on the channel quality of the first test frequency point and the channel quality of the selected second test frequency point;

reusing the final link establishment frequency point and the called equipment link establishment;

the first call frame is received by the called equipment through polling scanning of a plurality of preset sub-bands of short waves, and is of a first signaling type; the first signaling type comprises synchronization information of the plurality of preset sub-bands; the first response frame, the second response frame and the third response frame are of a second signaling type, and the downlink channel quality of the first test frequency point and the downlink channel quality of the second test frequency point are contained in a data field of the second signaling type; the second call frame is of a third signaling type, and the third signaling type comprises synchronization information corresponding to a preset sub-frequency band where the second test frequency point is located.

2. The short wave link establishment method according to claim 1, characterized in that the method further comprises:

if the downlink channel quality and/or the uplink channel quality of the first test frequency point are determined to be not in accordance with the preset link establishment condition, reselecting the first test frequency point from the shortwave available frequency point set, and executing the subsequent step of selecting the first test frequency point;

the link establishment between the first test frequency point and the called equipment comprises the following steps:

transmitting a first confirmation frame to the called equipment at the first test frequency point so as to complete chain establishment with the called equipment at the first test frequency point, wherein the first confirmation frame is of a second signaling type;

the preset link establishment condition is that the uplink channel quality of the first test frequency point is larger than the preset uplink channel quality, and the downlink channel quality of the first test frequency point is larger than the preset downlink channel quality.

3. The short wave chaining method according to claim 1, wherein the third signaling type includes a first synchronization field corresponding to the preset sub-band, a second synchronization field, and a data field, the first synchronization field being used for the called device to synchronize with the calling device when scanning to the corresponding preset sub-band, and the second synchronization field being used for synchronization when decoding the data field.

4. The short wave link establishment method according to claim 1, wherein the receiving the second response frame fed back by the called device on the first test frequency point and the third response frame fed back by the called device on the selected second test frequency point includes:

receiving a second response frame fed back by the called equipment on the first test frequency point and a third response frame fed back by the called equipment on the selected second test frequency point by taking the first test frequency point as a central frequency point;

the obtaining the channel quality of the first test frequency point based on the second response frame, and obtaining the channel quality of the selected second test frequency point based on the third response frame includes:

based on the second response frame, obtaining the uplink channel quality and the downlink channel quality of the first test frequency point, and based on the third response frame, obtaining the uplink channel quality and the downlink channel quality of the selected second test frequency point;

the selecting a final link establishment frequency point from the first test frequency point and the selected second test frequency point based on the channel quality of the first test frequency point and the channel quality of the selected second test frequency point includes:

Acquiring a first comprehensive channel quality based on the uplink channel quality and the downlink channel quality of the first test frequency point; the method comprises the steps of,

acquiring a second comprehensive channel quality based on the uplink channel quality and the downlink channel quality of the selected second test frequency point;

and selecting a final link establishment frequency point from the first test frequency point and the selected second test frequency point by determining the corresponding frequency point with better channel quality in the first comprehensive channel quality and the second comprehensive channel quality.

5. The short wave link establishment method according to claim 1, wherein the preset channel conditions include: a second test frequency point with optimal downlink channel quality;

the re-using the final link establishment frequency point to establish a link with the called equipment comprises the following steps:

and sending a second confirmation frame to the called equipment at the final link establishment frequency point so as to complete link establishment with the called equipment at the final link establishment frequency point, wherein the second confirmation frame is of a second signaling type.

6. The short wave link establishment method according to claim 1, wherein the first signaling type includes a plurality of first synchronization fields, a plurality of second synchronization fields, and a plurality of data fields, each corresponding to a plurality of preset sub-bands of the short wave; the first call frame is used for providing the called equipment with polling scanning for the plurality of preset sub-bands; the first synchronization field is used for synchronizing the called equipment with the calling equipment when the called equipment scans the corresponding preset sub-frequency band, the second synchronization field is used for synchronizing when the data field is decoded, and the data field in the first call frame comprises the call address of the called equipment so that the called equipment responds to the first call frame and feeds back the first response frame when the call address is determined to be the called equipment;

The second signaling type includes the second synchronization field and a data field.

7. The short wave link establishment method according to claim 1, wherein the selecting a first test frequency point from a set of available short wave frequency points comprises:

acquiring a shortwave available frequency point set;

and selecting the first test frequency point from the shortwave available frequency point set in sequence.

8. The short wave link establishment method according to claim 7, wherein the acquiring the set of available frequency points of the short wave includes:

acquiring the shortwave available frequency point set based on a preset initial frequency point and a frequency step length; and/or the number of the groups of groups,

the selecting the first test frequency point in the shortwave available frequency point set in sequence includes:

ordering the frequency points in the shortwave available frequency point set according to the order of the signal to noise ratio of each frequency point;

selecting frequency points in the shortwave available frequency point set as the first test frequency points according to the ordering in the shortwave available frequency point set;

the sorting the frequency points in the shortwave available frequency point set according to the order of the signal to noise ratio of each frequency point comprises the following steps:

acquiring a real-time signal-to-noise ratio of each frequency point of the shortwave available frequency point set and a historical signal-to-noise ratio of each frequency point;

Determining a first weight of the real-time signal-to-noise ratio and a second weight of the historical signal-to-noise ratio;

performing weighted operation on the real-time signal-to-noise ratio and the historical signal-to-noise ratio by using the first weight and the second weight, and arranging frequency points of the shortwave available frequency point set according to the sequence from the big to the small of the weighted result;

when the calling equipment is a mobile station, the ratio of the first weight to the second weight is larger than 1, and when the calling equipment is a fixed station, the ratio of the first weight to the second weight is smaller than 1.

9. The short wave link establishment method is characterized by comprising the following steps of:

the method comprises the steps that called equipment receives a first call frame sent by calling equipment at a first test frequency point, wherein the first test frequency point is obtained by selecting from a shortwave available frequency point set;

determining the downlink channel quality of the first test frequency point, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point;

receiving a first confirmation frame sent by the calling equipment, and establishing a link with the calling equipment by using the first test frequency point, wherein the first confirmation frame is sent by the calling equipment after determining that the downlink channel quality and the uplink channel quality of the first test frequency point meet preset link establishment conditions;

Taking the first test frequency point as a central frequency point, and respectively receiving second call frames sent by the calling equipment at a preset number of second test frequency points before and after the first test frequency point;

selecting second test frequency points which accord with preset channel conditions from the front and back preset number of second test frequency points;

a second response frame sent on the first test frequency point and a third response frame sent on the selected second test frequency point;

receiving a second confirmation frame sent by the calling equipment at a final link establishment frequency point, and establishing a link with the calling equipment by utilizing the final link establishment frequency point, wherein the final link establishment frequency point is selected from the first test frequency point and the selected second test frequency point by the calling equipment according to the channel quality of the first test frequency point and the selected second test frequency point;

the first call frame is received by the called equipment through polling scanning of a plurality of preset sub-bands of short waves, and is of a first signaling type; the first signaling type comprises synchronization information of the preset sub-bands, the first response frame, the second response frame, the third response frame and the second acknowledgement frame are of a second signaling type, and the downlink channel quality of the first test frequency point and the downlink channel quality of the selected second test frequency point are contained in a data field of the second signaling type; the second call frame is of a third signaling type, and the third signaling type comprises synchronization information corresponding to a preset sub-frequency band where the second test frequency point is located.

10. The short wave chaining method according to claim 9, further comprising, after the receiving the first call frame sent by the calling device at the first test frequency point:

selecting synchronization information of a preset sub-band corresponding to the first test frequency point from the synchronization information of the preset sub-bands contained in the first call frame, and synchronizing with the calling equipment through the selected synchronization information;

judging whether the calling address in the first calling frame is matched with the self address, if so, determining that the calling address is the opposite terminal called by the calling equipment, and executing the downlink channel quality and the follow-up steps of determining the first test frequency point.

11. The short wave link establishment method according to claim 10, wherein the transmitting the first response frame including the downlink channel quality of the first test frequency point at the first test frequency point includes:

switching to a narrowband mode, and sending a first response frame containing the downlink channel quality of the first test frequency point at the first test frequency point.

12. The short wave chaining method according to claim 11, wherein the third signaling type includes a first synchronization field corresponding to the preset sub-band, a second synchronization field, and a data field, the first synchronization field being used for the called device to synchronize with the calling device when scanning to the corresponding preset sub-band, and the second synchronization field being used for synchronization when decoding the data field.

13. The short wave link establishment method according to claim 9, wherein the first signaling type includes a plurality of first synchronization fields, a second synchronization field, and a data field, which correspond to a plurality of preset sub-bands of a short wave, respectively; the first call frame is used for providing the called equipment with polling scanning for the plurality of preset sub-bands; the first synchronization field is used for synchronizing the called equipment with the calling equipment when the called equipment scans the corresponding preset sub-frequency band, the second synchronization field is used for synchronizing when the data field is decoded, and the data field in the first call frame comprises the call address of the called equipment so that the called equipment responds to the first call frame and feeds back the first response frame when the call address is determined to be the called equipment;