Frequency point selection method, terminal registration method and communication system

Abstract

The invention provides a frequency point selection method, which is used for selecting a frequency point for a terminal in a communication system so as to determine a working frequency band to receive a broadcast signal of a satellite or a base station, and comprises the following steps in each frequency point selection process: acquiring frequency point information, the frequency point information comprises a plurality of standard frequency points and historical frequency points used last time by the terminal; searching a frequency correction channel of the historical frequency point and calculating signal intensity, and if the signal intensity of the frequency correction channel of the historical frequency point is greater than or equal to a preset threshold, using the historical frequency point; and otherwise, searching in a plurality of standard frequency points except the historical frequency points one by one until the signal strength of the frequency correction channel of one standard frequency point is greater than or equal to the preset threshold value, and using the standard frequency point. According to the technical scheme provided by the invention, the invalid frequency point searching and selecting process is avoided by preferentially searching the frequency correction channel of the historical frequency points, so that the frequency point selecting time is shortened.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, and in particular to a frequency selection technology in wireless communications technology, and more particularly to a frequency selection method, a terminal registration method and a communication system. Background Art

[0002] The terminal device needs to continuously receive and send air interface data to establish a connection. In wireless communication scenarios, the quality of the RF signal is related to the air interface channel conditions, such as whether the RF signal is blocked, whether the signal in the frequency band is interfered with, whether the signal-to-noise ratio is good, etc. When establishing a connection, the terminal will first determine the working frequency band identified by the frequency point, and after completing the frequency point selection, connect to the satellite or base station with the working frequency band corresponding to the frequency point to complete the terminal registration, and receive the broadcast signal of the satellite or base station through the working frequency band.

[0003] The general frequency selection scheme is to search for the frequency correction channel (FCCH) of different frequencies in the whole frequency band in the air interface downlink, calculate the signal strength of the channel corresponding to each frequency, find the frequency with the best channel signal strength from these frequencies, and receive the wireless signal in the working frequency band identified by the frequency.

[0004] Although the general frequency selection scheme can achieve frequency selection, it also faces some challenges. Due to the different transmission distances of air interface signals and the possible obstructions such as high-rise buildings, mountains, tunnels, etc. within the signal coverage range in some areas, the signal strength will be reduced by the multipath effect and shadow effect. These complex channel transmission conditions will affect the downlink, resulting in increased difficulty in searching for frequency correction channels at different frequencies and longer search times. In addition, with the evolution of communication technology and systems, the frequency band resources of the air interface are becoming more and more abundant, which brings more convenience to users and also puts higher requirements on the general frequency selection scheme. Because in the general frequency selection scheme, it is necessary to complete the search of all frequencies in the whole frequency band, and the traversal search of all frequencies will take a long time, which will not only prolong the frequency search time, but also may cause the terminal to have no signal service, affecting the user experience. What's worse, each frequency selection process must repeat the frequency correction channel search process on different frequency bands, and repeated searches add additional search time.

[0005] In summary, although the general frequency selection scheme can realize frequency selection, there is a problem that the frequency selection time is long.

[0006] It should be noted that this background technology is only used to introduce the relevant information of the present invention to help understand the technical solution of the present invention, but it does not mean that the relevant information is necessarily the prior art. If there is no evidence that the relevant information has been disclosed before the application date of the present invention, the relevant information shall not be regarded as the prior art. Summary of the invention

[0007] Therefore, the purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a frequency selection method, a terminal registration method and a communication system.

[0008] The objectives of the present invention are achieved through the following technical solutions.

[0009] According to a first aspect of the present invention, there is provided a frequency selection method for selecting a frequency for a terminal in a communication system to determine a working frequency band to receive a broadcast signal from a satellite or base station, the method comprising executing the following steps in each frequency selection process: acquiring frequency information, the frequency information comprising a plurality of standard frequencies and a historical frequency last used by the terminal; searching for a frequency correction channel of the historical frequency and calculating the signal strength, if the signal strength of the frequency correction channel of the historical frequency is greater than or equal to a preset threshold, the historical frequency is used; otherwise, searching one by one in a plurality of standard frequencies other than the historical frequency until a frequency correction channel of a standard frequency is found whose signal strength is greater than or equal to the preset threshold, and the standard frequency is used.

[0010] In some embodiments of the present invention, the method further includes: if the signal strength of the frequency correction channels of all standard frequencies does not satisfy or be equal to a preset threshold, selecting a standard frequency with the strongest frequency correction channel signal from all standard frequencies and using the standard frequency.

[0011] In some embodiments of the present invention, the method also includes: if the working frequency band corresponding to the historical frequency point is used to receive the broadcast signal of the satellite or base station, then the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the historical frequency point is monitored; when the number of erroneous broadcast data is greater than or equal to a preset threshold, re-searching one by one in multiple standard frequency points other than the historical frequency point until a signal strength of the frequency correction channel of a standard frequency point is found to be greater than or equal to the preset threshold, and the standard frequency point is used.

[0012] In some embodiments of the present invention, the method also includes: if the working frequency band corresponding to the standard frequency point is used to receive the broadcast signal of the satellite or base station, then the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the standard frequency point is monitored; when the number of erroneous broadcast data is greater than or equal to a preset threshold, re-searching one by one in other multiple standard frequency points that have not been searched until a signal strength of the frequency correction channel of a standard frequency point is found to be greater than or equal to the preset threshold, and the standard frequency point is used.

[0013] Preferably, the preset threshold is determined as follows:

[0014] θ=α+β

[0015] Wherein, θ represents a preset threshold, α represents the physical layer sensitivity of the terminal, and β represents a preset value.

[0016] Preferably, the preset value is 4.

[0017] According to a second aspect of the present invention, there is provided a terminal registration method for selecting a frequency point for a terminal in a communication system to determine a working frequency band to connect to a satellite or a base station for terminal registration. The method comprises: step S1, selecting a frequency point for the terminal using the method described in the first aspect of the present invention; step S2, connecting to a satellite or a base station with the working frequency band of the frequency point selected in step S1 for terminal registration.

[0018] According to a third aspect of the present invention, there is provided a communication system, the system comprising one or more terminals, wherein each terminal is configured to select a frequency point according to the method described in the first aspect of the present invention, and to perform terminal registration according to the method described in the second aspect of the present invention.

[0019] Compared with the prior art, the advantages of the present invention are: (1) the frequency correction channel signal of the historical frequency point is searched preferentially, and the historical frequency point is directly used when the signal strength is greater than or equal to the preset threshold, thereby reducing the search time; (2) when the historical frequency point is not available, the frequency points are searched one by one, and the search is stopped when the frequency correction channel signal of the searched frequency point satisfies the signal strength greater than or equal to the preset threshold, so as to reduce the invalid frequency point search process and quickly complete the frequency point selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0021] Figure 1 A schematic diagram of the existing terminal frequency selection and broadcast reception process;

[0022] Figure 2 A schematic diagram of a frequency selection process according to an embodiment of the present invention;

[0023] Figure 3 The figure is a schematic diagram of an example of frequency selection according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] As mentioned in the background technology section, although the general frequency selection scheme can realize frequency selection, there is a problem that the frequency selection time is long.

[0026] In order to solve the above problems, the inventors conducted in-depth research on the existing frequency selection schemes and found that under different channel conditions, the search time of the frequency correction channel with weak signal strength is longer, especially under signal conditions close to the sensitivity of the physical layer. The search time of the frequency correction channel can be as long as more than ten seconds, and the ratio between the shortest search time and the longest search time of the frequency correction channel is close to 1:5. However, when comparing the time it takes for the terminal to register with the base station, the inventors found that regardless of the channel conditions of the frequency correction channel search process, the registration time for the terminal to connect to the base station is basically the same. This is because the existing frequency selection scheme needs to traverse all frequencies. Further analysis of the terminal's frequency selection and base station connection process, such as Figure 1 As shown in the figure, the specific process includes: frequency selection, broadcast reception, channel allocation and uplink and downlink services. Among them, the uplink and downlink services of the terminal are completed on the allocated channels, and their performance is determined by the base station and has nothing to do with the frequency correction channel searched in the frequency selection. In addition, due to the large signal coverage range, the impact of the terminal's position movement on the frequency selection is relatively small.

[0027] Based on the above analysis, the inventor proposes a new frequency selection scheme, in which it is not necessary to traverse all frequencies, but to first search the historical frequency used last time. As long as the signal strength of the frequency correction channel corresponding to the historical frequency is greater than or equal to the preset threshold, the historical frequency is used. Otherwise, the frequencies other than the historical frequency are searched one by one until a frequency correction channel whose signal strength is greater than or equal to the preset threshold is found, and the frequency is used. This new frequency selection scheme does not need to traverse all frequencies, but only needs to search for frequencies that meet the conditions. This search method can not only avoid invalid frequency search processes, but also shorten the frequency selection time, improve user experience, and save the process of terminal re-registration when choosing to use historical frequencies. In addition, since the performance of the terminal's uplink and downlink services is determined by the base station, this frequency selection method will not reduce the performance of the terminal's uplink and downlink services.

[0028] In summary, if Figure 2 As shown, the present invention provides a frequency selection method for selecting a frequency for a terminal in a communication system to determine a working frequency band to receive a broadcast signal from a satellite or a base station. The method includes performing the following steps in each frequency selection process: acquiring frequency information, the frequency information including a plurality of standard frequencies and a historical frequency last used by the terminal; searching for a frequency correction channel of the historical frequency and calculating the signal strength, and if the signal strength of the frequency correction channel of the historical frequency is greater than or equal to a preset threshold, the historical frequency is used; otherwise, searching one by one in a plurality of standard frequencies other than the historical frequency until a frequency correction channel of a standard frequency is found whose signal strength is greater than or equal to the preset threshold, and the standard frequency is used.

[0029] In order to better understand the present invention, the frequency point selection scheme proposed by the present invention is described in detail below in conjunction with specific embodiments.

[0030] According to one embodiment of the present invention, the method further includes: if the signal strength of the frequency correction channels of all standard frequencies does not satisfy or exceed a preset threshold, selecting a standard frequency with the strongest frequency correction channel signal from all standard frequencies and using the standard frequency.

[0031] According to one embodiment of the present invention, the method also includes: if the working frequency band corresponding to the historical frequency point is used to receive the broadcast signal of the satellite or base station, then the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the historical frequency point is monitored; when the number of erroneous broadcast data is greater than or equal to a preset threshold, re-searching one by one in multiple standard frequency points other than the historical frequency point until a signal strength of the frequency correction channel of a standard frequency point is found to be greater than or equal to the preset threshold, and the standard frequency point is used.

[0032] According to one embodiment of the present invention, the method further includes: if the working frequency band corresponding to the standard frequency point is used to receive the broadcast signal of the satellite or base station, then the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the standard frequency point is monitored; when the number of erroneous broadcast data is greater than or equal to the preset threshold, the other multiple standard frequency points that have not been searched are searched one by one until the signal strength of the frequency correction channel of a standard frequency point is greater than or equal to the preset threshold, and the standard frequency point is used. It should be noted that by monitoring the number of erroneous broadcasts received by the terminal through this negative feedback exception handling mechanism, it is possible to ensure that the terminal has good uplink and downlink transceiver capabilities while quickly searching for the frequency point.

[0033] According to one embodiment of the present invention, the preset threshold is determined as follows:

[0034] θ=α+β

[0035] Wherein, θ represents a preset threshold, α represents the physical layer sensitivity of the terminal, and β represents a preset value.

[0036] According to an embodiment of the present invention, the preset value is 4. It should be noted that the preset value can also be set according to actual needs, for example, it can be set to 5, 6, etc., and the present invention does not impose any special limitation on it.

[0037] In order to better understand the frequency selection scheme proposed by the present invention, the specific execution flow of the frequency selection is described in detail below in combination with the content in the aforementioned embodiment. The specific frequency selection process is as follows: the terminal first obtains the frequency information from the memory, wherein the frequency information includes multiple standard frequencies and the historical frequency used by the terminal last time; then, the terminal protocol stack sends a search request to instruct the terminal physical layer to search the frequency correction channel of the historical frequency and calculate the signal strength, and the terminal physical layer sends the search result to the terminal protocol stack, and the terminal protocol stack analyzes whether the signal strength of the frequency correction channel of the historical frequency is greater than or equal to the preset threshold (θ), and if so, the historical frequency is used; otherwise, the terminal protocol stack initiates a search request one by one in multiple standard frequencies other than the historical frequency, instructing the terminal physical layer to search one by one until the signal strength of the frequency correction channel of a standard frequency is greater than or equal to the preset threshold, and the standard frequency is used; if the search result shows that the signal strength of the frequency correction channel of all standard frequencies does not meet or exceed the preset threshold, then the standard frequency with the strongest frequency correction channel signal is selected from all standard frequencies, and the standard frequency is used. It should be noted that even if the working frequency band corresponding to the historical frequency point or the standard frequency point has been selected to receive the broadcast signal of the satellite or base station, it is also necessary to monitor the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the historical frequency point or the standard frequency point; once the number of erroneous broadcast data is greater than or equal to the preset threshold, it is necessary to re-search other frequencies whose signal strength satisfies or is greater than or equal to the preset threshold. It should also be noted that compared with the general frequency selection scheme, the frequency selection scheme proposed in the present invention can shorten the frequency selection time, but the frequency selection time saved in different scenarios is different. For example, in the scenario with excellent channel signal conditions, compared with the general frequency selection scheme, the frequency selection scheme proposed in the present invention can shorten the frequency selection time by about 2-3s; and under weak channel signal conditions, compared with the general frequency selection scheme, the frequency selection scheme proposed in the present invention can shorten the frequency selection time by more than ten seconds. Moreover, the frequency selection scheme proposed in the present invention has no significant difference in frequency selection time when facing excellent channel signal conditions and weak channel signal conditions. This indicates that the frequency selection scheme proposed in the present invention performs well regardless of whether the frequency selection is performed under excellent channel signal conditions or under weak channel signal conditions.

[0038] In order to more fully understand the frequency selection scheme proposed by the present invention, Figure 3 The frequency points shown are selected as examples for illustration.

[0039] Depend on Figure 3(a) It can be seen that in each frequency selection process, the terminal protocol stack sends a search request to instruct the terminal physical layer to first search the frequency correction channel of the historical frequency in the frequency information and calculate the signal strength. The terminal physical layer sends the search result to the terminal protocol stack. The terminal protocol stack analyzes whether the signal strength of the frequency correction channel of the historical frequency is greater than or equal to the preset threshold. When the signal strength of the frequency correction channel of the historical frequency is greater than or equal to the preset threshold, the base station is connected with the working frequency band corresponding to the historical frequency to realize uplink and downlink services.

[0040] Depend on Figure 3 (b) It can be seen that in each frequency selection process, the terminal protocol stack sends a search request to instruct the terminal physical layer to first search the frequency correction channel of the historical frequency and calculate the signal strength. The terminal physical layer sends the search result to the terminal protocol stack, and the terminal protocol stack analyzes whether the signal strength of the frequency correction channel of the historical frequency is greater than or equal to the preset threshold; when the signal strength of the frequency correction channel of the historical frequency does not meet the requirement of being greater than or equal to the preset threshold, the terminal protocol stack initiates a search request one by one in multiple standard frequency points other than the historical frequency points, instructing the terminal physical layer to search the frequency correction channels of the standard frequency points one by one and calculate the signal strength, and terminates the search after each search. The terminal physical layer sends the search result to the terminal protocol stack. The terminal protocol stack analyzes whether the signal strength of the frequency correction channel of the searched standard frequency is greater than or equal to the preset threshold. When the signal strength of the frequency correction channel of the searched standard frequency is greater than or equal to the preset threshold, the terminal protocol stack stops searching and connects to the base station with the working frequency band corresponding to the standard frequency to realize uplink and downlink services. If after searching all the standard frequencies, the signal strength of the frequency correction channel of any standard frequency is still greater than or equal to the preset threshold, the standard frequency with the strongest signal strength of the frequency correction channel is selected, and the base station is connected with the working frequency band of the standard frequency to realize uplink and downlink services.

[0041] Based on the frequency selection method described in the aforementioned embodiment, the present invention also proposes a terminal registration method, which is used to select a frequency for a terminal in a communication system to determine a working frequency band to connect to a satellite or a base station to realize terminal registration. The method comprises: step S1, using the method described in the aforementioned embodiment to select a frequency for the terminal; step S2, using the working frequency band of the frequency selected in step S1 to connect to a satellite or a base station to realize terminal registration.

[0042] Based on the aforementioned embodiments, the present invention further proposes a communication system, the system comprising one or more terminals, wherein each terminal is configured to select a frequency according to the method described in the aforementioned embodiments, and to perform terminal registration according to the registration method described in the aforementioned embodiments.

[0043] The beneficial effects of the present invention are: (1) the frequency correction channel signal of the historical frequency point is searched preferentially, and the historical frequency point is directly used when the signal strength is greater than or equal to the preset threshold, thereby reducing the search time; (2) when the historical frequency point is unavailable, the frequency points are searched one by one, and the search is stopped when the frequency correction channel signal of the searched frequency point satisfies the signal strength greater than or equal to the preset threshold, so as to reduce the invalid frequency point search process and quickly complete the frequency point selection.

[0044] It should be noted that although the above describes the various steps in a specific order, it does not mean that the various steps must be executed in the above specific order. In fact, some of these steps can be executed concurrently or even in a different order as long as the required functions can be achieved.

[0045] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0046] Computer readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. Computer readable storage medium can include, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive list) of computer readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, for example, a punch card or a protruding structure in a groove on which instructions are stored, and any suitable combination thereof.

[0047] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A frequency selection method for selecting a frequency for a terminal in a communication system to determine a working frequency band to receive a broadcast signal from a satellite or a base station, characterized in that: The method comprises performing the following steps in each frequency selection process: Acquire frequency information, where the frequency information includes multiple standard frequencies and a historical frequency last used by the terminal; Search for the frequency correction channel of the historical frequency point and calculate the signal strength. If the signal strength of the frequency correction channel of the historical frequency point is greater than or equal to the preset threshold, the historical frequency point is used; otherwise, search one by one in multiple standard frequency points other than the historical frequency point until a standard frequency point is found whose signal strength is greater than or equal to the preset threshold, and this standard frequency point is used.

2. The method according to claim 1, characterized in that The method further comprises: If the signal strengths of the frequency correction channels of all standard frequency points do not satisfy or exceed the preset threshold, a standard frequency point with the strongest frequency correction channel signal is selected from all standard frequency points and used.

3. The method according to claim 2, characterized in that The method further comprises: If the working frequency band corresponding to the historical frequency point is used to receive the broadcast signal of the satellite or base station, the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the historical frequency point is monitored; When the number of erroneous broadcast data is greater than or equal to the preset threshold, multiple standard frequency points other than the historical frequency points are searched one by one until a frequency correction channel of a standard frequency point is found whose signal strength is greater than or equal to the preset threshold, and the standard frequency point is used.

4. The method according to claim 3, characterized in that The method further comprises: If the working frequency band corresponding to the standard frequency point is used to receive the broadcast signal of the satellite or base station, the number of erroneous broadcast data transmitted by the broadcast signal received by the working frequency band corresponding to the standard frequency point is monitored; When the number of erroneous broadcast data is greater than or equal to the preset threshold, the other multiple standard frequency points that have not been searched are searched one by one until a frequency correction channel of a standard frequency point is found whose signal strength is greater than or equal to the preset threshold, and the standard frequency point is used.

5. The method according to claim 4, wherein the preset threshold is determined in the following manner: θ=α+β in, θ represents a preset threshold, α represents the physical layer sensitivity of the terminal, and β represents a preset value.

6. The method according to claim 5, characterized in that The preset value is 4.

7. A terminal registration method, used for selecting a frequency point for a terminal in a communication system to determine a working frequency band to connect to a satellite or a base station to realize terminal registration, characterized in that: The method comprises: Step S1, selecting a frequency point for a terminal using any method described in claims 1-6; Step S2: Connect to a satellite or a base station using the working frequency band of the frequency point selected in step S1 to register the terminal.

8. A communication system, characterized in that: The system includes one or more terminals, wherein each terminal is configured to select a frequency point according to the method according to any one of claims 1 to 6, and to perform terminal registration according to the method according to claim 7.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program can be executed by a processor to implement the steps of the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: one or more processors; as well as A memory, wherein the memory is used to store executable instructions; The one or more processors are configured to implement the steps of the method of any one of claims 1 to 7 by executing the executable instructions.

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