A method for late network entry of a frequency hopping communication station based on early insertion

Abstract

A method for late network entry of a frequency hopping communication station based on early insertion, comprising the following steps: inserting a late network entry hop before normal frequency hopping communication every certain time after normal network entry station communication starts, the frequency of the late network entry hop being generated by both communication parties according to certain rules, and the data frame of the late network entry hop containing TOD information of the station that can normally enter the network; the late network entry station entering a late network entry search mode through specific operation, the search frequency being generated in the frequency set of the late network entry hop, sequentially slowly scanning, and capturing the late network entry hop; after successful capture, the TOD information contained in the data frame is solved; the position of the captured late network entry hop is judged according to the search frequency at the time of successful capture, the position of the normal frequency hopping communication is calculated, and the station is guided to enter the frequency hopping communication station network. The method can ensure that the late network entry request of the station that has not entered the network obtains a late network entry capture opportunity every certain time, and is independent of the time difference between the local station and the network entry station, and has the advantages of high synchronization efficiency and wide application range.

Description

Technical fields:

[0001] This invention belongs to the field of frequency hopping communication system design, and specifically relates to a method for late network entry of frequency hopping communication radios based on early insertion, suitable for stable and reliable communication. Background technology:

[0002] In recent years, frequency hopping communication has been widely used in both military and civilian fields. Frequency hopping communication network access is divided into normal initial network access and late network access. When a radio station fails to initially access the network normally due to factors such as excessive time difference, it needs to achieve frequency hopping synchronization through late network access.

[0003] Traditional methods for late radio entry into the network primarily rely on service information inserted into information hops, offering advantages such as high acquisition probability and reliable synchronization. However, this method results in slow late entry and is limited by the time difference between radios, making it unsuitable for late entry by radios with excessively large time differences. Summary of the Invention:

[0004] To overcome the above-mentioned shortcomings, the present invention provides a method for late network entry of frequency hopping communication radios based on early insertion, so as to improve the efficiency and applicability of frequency hopping late network entry.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A method for late network entry of frequency-hopping communication radios based on early insertion includes the following steps:

[0007] Step 1: After normal network access radio communication begins, a number of late network access hops are inserted before normal frequency hopping communication at regular intervals. The data frames of the late network access hops contain the TOD information and synchronization sequence for the radio to be able to join the network normally.

[0008] Step 2: The late-entry radio enters the late-entry search mode through the operation interface. The search frequency is generated from the frequency cluster of the late-entry network jump. The frequency is slowly scanned in sequence to capture the synchronization sequence. If the capture is not successful within 3 minutes, the late-entry search mode will be automatically exited.

[0009] Step 3: If the capture is successful, extract the TOD information contained in the data frame and obtain the network time of the current normal network access radio communication network;

[0010] Step 4: Determine the location of the captured late-entry hop based on the search frequency and synchronization sequence type when the capture is successful, determine the location of the starting synchronization hop, and calculate the normal entry frequency based on the TOD information. Late entry is successful.

[0011] In step 1, a late network entry jump is inserted when a normally connected radio initiates communication for the first time within 1 minute.

[0012] The method for determining the number of late-entry hops in step 1 is as follows: set the number of late-entry hops in each group to 10 hops; repeatedly send m groups of late-entry hops, then the number of late-entry hops is 10*m hops.

[0013] The method for determining the frequency of late-entry network hopping in step 1 is as follows: multiple sets of late-entry network hopping frequencies are stored in advance in the late-entry network radio station, and the late-entry network hopping frequency corresponds one-to-one with the network number. The late-entry network hopping frequency is selected according to the network number of the late-entry network radio station.

[0014] The data frames for late-entry network jumps in step 1 also include pre-protection and post-protection. The synchronization sequence is a PN sequence, and each group of late-entry network jumps uses the same PN sequence, namely PN1, PN2, ..., PN. m There are a total of m PN sequences.

[0015] In step 2, the late-entry radio menu has a "late-entry network" operation interface. By operating the interface, you can enter the late-entry network search mode. The search frequency is selected sequentially from the late-entry network hopping frequency group corresponding to the network number. The duration of each search frequency is 11*T, where T is the frequency hopping period of the radio.

[0016] Due to the adoption of the technical solution described above, the present invention has the following advantages:

[0017] This invention provides a method for late network entry of frequency hopping communication radios based on early insertion. When a communication is first initiated within each minute, a late-entry hopping radio is inserted for search and capture. This ensures that radios not yet connected to the network can obtain a late-entry hopping capture opportunity at regular intervals after initiating a late-entry request, regardless of the time difference between the local radio and the connected radio, thus improving the efficiency of late-entry. Attached image description:

[0018] Figure 1 This is a flowchart of the present invention;

[0019] Figure 2 This is a schematic diagram illustrating the timing of the late-entry network jump insertion according to the present invention;

[0020] Figure 3 This is a diagram illustrating the late-entry network frame skipping structure of the present invention.

[0021] Figure 4 This is a schematic diagram illustrating the late-entry network search of the radio station according to the present invention. Detailed implementation method:

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] An embodiment of a late network entry method for frequency hopping communication radios based on early insertion, as described in the accompanying drawings, includes the following steps:

[0025] Step 1: After the radio successfully connects to the network, initiate voice communication via the radio's PTT button. Normally, the transmitted content includes a frequency hopping sync header and voice data. However, when initiating voice communication for the first time within one minute, a late network entry hop will be inserted before the frequency hopping sync header. The timing of this insertion is as follows: Figure 2 As shown in the figure, when communication is initiated at times t1, t3, and t4, a late-entry network hop will be inserted, but when communication is initiated at other times, no late-entry network hop will be inserted.

[0026] The number of late-entry hops in each group is set to 10. To improve the synchronization success rate, m groups of late-entry hops can be sent repeatedly. Here, we take m=3, so the number of late-entry hops is 30.

[0027] Assuming the maximum network number that a radio station can be set to is n, then n sets of late-entry network hopping frequencies are pre-stored within the radio station. The late-entry network hopping frequency is selected based on the late-entry network radio station's network number. If the current late-entry network radio station's network number is 2, then the second set of frequencies f is selected. 11 ,f 12 ,…,f 20 As the late-entry network hopping frequency.

[0028] The late-entry data frame consists of pre-protection, synchronization sequence, TOD information, and post-protection. The synchronization sequence uses the PN sequence. The specific frame structure is as follows: Figure 3 As shown. Each group of late-entry network jumps uses the same PN sequence, namely PN1, PN2, ..., PN m There are a total of 3 PN sequences. Different groups have the same late-entry hop frequency but different synchronization sequences. The specific correspondence between the late-entry hop position, late-entry hop frequency, and PN sequence is as follows:

[0029] Jump 1 <![CDATA[f 11 ]]> <![CDATA[PN1]]> 2nd jump <![CDATA[f 12 ]]> <![CDATA[PN1]]> …… …… …… 10th jump <![CDATA[f 20 ]]> <![CDATA[PN1]]> 11th jump <![CDATA[f 11 ]]> <![CDATA[PN2]]> 12th jump <![CDATA[f 12 ]]> <![CDATA[PN2]]> …… …… …… 20th jump <![CDATA[f 20 ]]> <![CDATA[PN2]]> 21st jump <![CDATA[f 11 ]]> <![CDATA[PN3]]> 22nd jump <![CDATA[f 12 ]]> <![CDATA[PN3]]> …… …… …… 30th jump <![CDATA[f 20 ]]> <![CDATA[PN3]]>

[0030] Step 2: Set the network number of the late-entry radio station to 2 as well. Enter the late-entry network search mode through the operation interface and search for the frequency f. 11 ,f 12 ,…,f 20 The scan is performed slowly in sequence, with each search frequency lasting for 11*T, where T is the frequency hopping period of the radio station. The local synchronization sequence used for acquisition is PN1, PN2, ..., PNm Three sequences are acquired in parallel. If the radio fails to acquire the sequence within 3 minutes, it will automatically exit the late-entry search mode.

[0031] Step 3: If the capture is successful, extract the TOD information contained in the data frame and obtain the network time of the current radio communication network.

[0032] Step 4: Determine the location of the captured late-entry network jump based on the search frequency and synchronization sequence type at the time of successful capture, and then determine the location of the starting synchronization jump. A diagram illustrating the radio late-entry network search is shown below. Figure 4 As shown.

[0033] Assume the radio station successfully acquires the synchronization sequence PN2, and the search frequency is f. 16 It can be seen that the currently captured late-entry hop is the 16th hop, and the normal synchronization hop will begin after another 14 hops. The normal entry frequency is calculated based on the TOD information, and the late-entry process ends.

[0034] Thus, the frequency hopping late network access process has been completed through the above four steps.

[0035] The present invention proposes a method for late network entry of frequency hopping communication radios based on early insertion. This method inserts a late network entry hop when the radio initiates communication for the first time every minute, allowing the late network entry radio to capture it. This ensures that radios not yet in the network can obtain a late network entry hop capture opportunity at regular intervals after initiating a late network entry request. It is independent of the time difference between the local radio and the radios already in the network, and features high synchronization efficiency and wide applicability. It can be applied to the late network entry design of frequency hopping communication radios transmitting voice services.

[0036] The parts not detailed above are existing technologies and therefore have not been described in detail.

Claims

1. A method for late network entry of frequency-hopping communication radios based on early insertion, characterized in that: Includes the following steps: Step 1: After normal network access radio communication begins, a number of late network access hops are inserted before normal frequency hopping communication at regular intervals. The data frames of the late network access hops contain the TOD information and synchronization sequence for the radio to be able to join the network normally. Step 2: The late-entry radio enters the late-entry search mode through the operation interface. The search frequency is generated from the frequency cluster of the late-entry network jump. The frequency is slowly scanned in sequence to capture the synchronization sequence. If the capture is not successful within 3 minutes, the late-entry search mode will be automatically exited. Step 3: If the capture is successful, extract the TOD information contained in the data frame and obtain the network time of the current normal network access radio communication network; Step 4: Determine the location of the captured late-entry hop based on the search frequency and synchronization sequence type when the capture is successful, determine the location of the starting synchronization hop, and calculate the normal entry frequency based on the TOD information. Late entry is successful.

2. The method for late network entry of frequency-hopping communication radios based on early insertion according to claim 1, characterized in that: In step 1, a late network entry jump is inserted when a normally connected radio initiates communication for the first time within 1 minute.

3. A method for late network entry of a frequency-hopping communication radio based on early insertion, as described in claim 1 or 2, characterized in that: The method for determining the number of late-entry hops in step 1 is as follows: set the number of late-entry hops in each group to 10 hops; repeatedly send m groups of late-entry hops, then the number of late-entry hops is 10*m hops.

4. The method for late network entry of a frequency-hopping communication radio based on early insertion according to claim 1, characterized in that: The method for determining the frequency of late-entry network hopping in step 1 is as follows: multiple sets of late-entry network hopping frequencies are stored in advance in the late-entry network radio station, and the late-entry network hopping frequency corresponds one-to-one with the network number. The late-entry network hopping frequency is selected according to the network number of the late-entry network radio station.

5. The method for late network entry of a frequency-hopping communication radio based on early insertion according to claim 1, characterized in that: The data frames for late-entry network jumps in step 1 also include pre-protection and post-protection. The synchronization sequence is a PN sequence, and each group of late-entry network jumps uses the same PN sequence, namely PN1, PN2, ..., PN. m There are a total of m PN sequences.

6. The method for late network entry of a frequency-hopping communication radio based on early insertion according to claim 1, characterized in that: In step 2, the late-entry radio menu has a "late-entry network" operation interface. By operating the interface, you can enter the late-entry network search mode. The search frequency is selected sequentially from the late-entry network hopping frequency group corresponding to the network number. The duration of each search frequency is 11*T, where T is the frequency hopping period of the radio.

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