CN118074780B - Information rate negotiation method, system and related device in Beidou short message system - Google Patents
Information rate negotiation method, system and related device in Beidou short message system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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Abstract
The invention relates to an information rate negotiation method, an information rate negotiation system and a related device in a Beidou short message system, and belongs to the field of Beidou short message communication systems. The Beidou short message user terminal receives the short message outbound signals forwarded by the central station through the Beidou satellite, and realizes stable tracking of the signals; demodulating and decoding the outbound signal according to the information rate indication in the received outbound signal, and recording all the information rates which can be decoded correctly to form a set; and selecting the highest information rate from the outbound information rates which can be correctly demodulated and decoded, using the highest information rate as an outbound information rate indication of the communication, modulating the information in an inbound signal, and forwarding the information to a central station of a Beidou short message communication system through a Beidou satellite. The invention can effectively reduce the communication overhead of the system and simultaneously provide high-quality short message communication service for users.
Description
Technical Field
The invention belongs to the field of Beidou short message communication systems, and particularly relates to an information rate negotiation method, system and related device in a Beidou short message system.
Background
With the expansion of the application field of the Beidou area civil short message system (RSMC), the civil mobile phone is utilized to realize the Beidou short message communication function, especially for the fields of emergency rescue, emergency communication and the like, the application of the Beidou area civil short message system has become an important development direction of the Beidou area short message communication system, and the civil mobile phone is directly connected into the Beidou short message communication system, so that the service utilization rate of the Beidou short message communication system can be greatly improved. Because civil mobile phone application environments are complex, scenes are various, communication channels between the civil mobile phone application environments and satellites possibly have large differences with time and environments, in order to greatly meet civil mobile phone users in different environments, the Beidou short message communication system designs information transmission rates of multiple gears, and therefore efficient negotiation of the information rates between the system and the users is required according to the channel environments.
The speed negotiation mechanism in a conventional communication system includes: the two parties of transceiver use basic rate to consult, after consulting, carry on the communication of higher rate again; message confirmation based on a sender, message retransmission, a rate negotiation mechanism of message speed regulation and the like under 802.11 protocol, wherein the rate negotiation mechanism is directly applied to a Beidou short message communication system, and the increase of system communication overhead is caused. The invention combines the characteristics of a Beidou short message communication system, and invents a high-efficiency self-adaptive communication rate negotiation method, a system and a related device of the short message communication system.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to provide a method, a system and a related device for negotiating information rate in a Beidou short message system so as to solve the problem of rate negotiation of the Beidou short message communication system.
(II) technical scheme
In order to solve the technical problems, the invention provides an autonomous outbound information rate selection method of a Beidou short message user terminal, which comprises the following steps:
S11, the Beidou short message user terminal receives short message outbound signals forwarded by the central station through the Beidou satellite, and stable tracking of the signals is achieved;
s12, the Beidou short message user terminal demodulates and decodes the outbound signals according to the information rate indication in the received outbound signals, and records all the information rates which can be decoded correctly to form a set { R i }.
S13, selecting the highest information rate R max＝max{Ri from the outbound information rates { R i } which can be correctly demodulated and decoded as an outbound information rate indication of the communication, modulating the information in an inbound signal, and forwarding the information to a central station of a Beidou short message communication system through a Beidou satellite;
S14, the central station of the Beidou short message communication system receives the inbound signals of the users, obtains outbound information rate indication information selected by the users, and modulates and transmits the outbound information according to the information.
Further, the information rate of the inbound signal is obtained by an inbound information rate selection method.
The invention also provides an inbound information rate selection method based on Beidou short message user terminal signal strength measurement, which comprises the following steps:
s21, receiving a short message outbound signal by the Beidou short message user terminal to obtain an estimated value CN0 r of a signal carrier-to-noise ratio;
S22, selecting a satellite with the largest carrier-to-noise ratio CN0 r as an inbound forwarding satellite;
s23, calculating the carrier-to-noise ratio of an inbound link according to the relative relation of link budget between a Beidou short message center station and a user terminal by using an outbound signal carrier-to-noise ratio CN0 r, wherein the specific method comprises the following steps of:
CN0s＝CN0r+A+P-G-B；
Wherein A is: when the power of an inbound signal transmitted by a user terminal is 0dBW, the corresponding conversion nominal difference between an inbound link and an outbound link depends on the system state of the Beidou short message, and when the system state is fixed, the value is a fixed value in dB for any user terminal;
p: the difference between the power of the inbound signal sent by the terminal from the port surface of the transmitting antenna and 0dBW is in dB;
g: receiving antenna gain by a terminal in dB;
b: polarization loss, noise coefficient and processing loss are integrated, and the unit dB is obtained;
S24, selecting a corresponding information rate for inbound according to the calculated inbound carrier-to-noise ratio CN0 s and demodulation thresholds under different inbound information rates.
Further, according to the current beidou short message system state, a=15 dB.
Further, in the step S24, according to demodulation thresholds of different inbound information rates of the beidou short message system, it is known that
When 35dBHz is less than or equal to CN0 s, the inbound rate is selected to be 2kbps;
when 32dBHz is less than or equal to CN0 s and less than 35dBHz, the inbound rate is selected to be 1kbps;
when CN0 s < 32dBHz, the central station system may not demodulate properly.
The invention also provides a blind demodulation method for the Beidou short message center station, which comprises the following steps:
S31, receiving an inbound signal sent by a user terminal by a Beidou short message center station, and performing stable capturing and tracking processing on the inbound signal;
s32, the central station receiving equipment demodulates and decodes the inbound signals, and traverses N different inbound information rates respectively;
S33, under N different information rates, only one type of successfully decoded inbound information can be finally decoded, and the successfully decoded inbound information is used as the inbound information actually sent by the user terminal; wherein the inbound information comprises: an outbound information rate indication.
Further, in the step S32, for the beidou short message communication system, n=2, that is, the current system has two different inbound information rates, namely, 2kbps and 1kbps, respectively.
The invention also provides a system for negotiating information rate in the Beidou short message system, which comprises: a central station and a user terminal;
The user terminal is used for executing the autonomous outbound information rate selection method of the Beidou short message user terminal and the inbound information rate selection method based on Beidou short message user terminal signal strength measurement, modulating the selected outbound information rate in an inbound signal, and transmitting the inbound signal at the selected inbound information rate;
the central station is used for receiving the inbound signals sent by the user terminal, executing the blind demodulation method of the Beidou short message central station and obtaining the inbound information sent by the user terminal.
The invention also provides a device for negotiating the information rate in the Beidou short message system, which is used for the user terminal and comprises the following steps: a transceiver module and a processing module;
The receiving and transmitting module is used for receiving signals from the Beidou satellite;
The processing module is used for executing the autonomous outbound information rate selection method of the Beidou short message user terminal and the inbound information rate selection method based on Beidou short message user terminal signal intensity measurement, and processing the Beidou short message outbound signals in the signals received by the receiving and transmitting module to obtain the outbound information rate and the inbound information rate.
The invention also provides a device for negotiating information rate in the Beidou short message system, which is used for the central station and comprises the following steps: a transceiver module and a processing module;
The receiving and transmitting module is used for receiving signals from the Beidou satellite;
The processing module is used for executing the blind demodulation method of the Beidou short message center station, processing the Beidou short message inbound signals from the user terminal in the signals received by the receiving and transmitting module, and obtaining inbound information sent by the user terminal.
(III) beneficial effects
The invention provides an information rate negotiation method, a system and a related device in a Beidou short message system, which have the beneficial technical effects that: the user terminal autonomously selects the outbound short message information rate according to the actual condition of receiving the short message outbound signal, and calculates the reasonable inbound short message information rate, so that the communication overhead of the system can be effectively reduced, and high-quality short message communication service is provided for the user.
Drawings
Fig. 1 is a diagram of a beidou short message system information rate negotiation method of the present invention;
Fig. 2 is an inbound information rate and demodulation threshold supported by the beidou short message system.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples.
According to the characteristics that the Beidou short message center station has stronger processing capability and outbound signals in the Beidou short message communication system are normally broadcast, the invention provides a receiving and transmitting double-transmission self-adaptive information rate negotiation mechanism based on autonomous receiving and selecting of a receiving party for the Beidou short message communication system.
The information rate negotiation method in the Beidou short message system comprises the following steps: an autonomous outbound information rate selection method of a Beidou short message user terminal, an inbound information rate selection method based on Beidou short message user terminal signal strength measurement and a Beidou short message central station blind demodulation method.
The invention discloses an autonomous outbound information rate selection method of a Beidou short message user terminal, which comprises the following steps of:
S11, the Beidou short message user terminal receives short message outbound signals forwarded by the central station through the Beidou satellite, and stable tracking of the signals is achieved;
s12, the Beidou short message user terminal demodulates and decodes the outbound signals according to the information rate indication in the received outbound signals, and records all the information rates which can be decoded correctly to form a set { R i }.
S13, selecting the highest information rate R max＝max{Ri from the outbound information rates { R i } which can be correctly demodulated and decoded, as an outbound information rate indication of the communication, modulating the information in an inbound signal, and forwarding the information to a central station of a Beidou short message communication system through a Beidou satellite;
wherein the information rate of the inbound signal is obtained by the inbound information rate selection method below;
S14, the central station of the Beidou short message communication system receives the inbound signals of the users, obtains outbound information rate indication information selected by the users, and modulates and transmits the outbound information according to the information.
The invention discloses an inbound information rate selection method based on Beidou short message user terminal signal intensity measurement, which comprises the following steps:
s21, receiving a short message outbound signal by the Beidou short message user terminal to obtain an estimated value CN0 r of a signal carrier-to-noise ratio;
S22, selecting a satellite with the largest carrier-to-noise ratio CN0 r as an inbound forwarding satellite;
s23, calculating the carrier-to-noise ratio of an inbound link according to the relative relation of link budget between a Beidou short message center station and a user terminal by using an outbound signal carrier-to-noise ratio CN0 r, wherein the specific method comprises the following steps of:
CN0s＝CN0r+A+P-G-B；
Wherein A is: when the power of an inbound signal transmitted by a user terminal is 0dBW, the conversion nominal difference of a corresponding system inbound link and an outbound link depends on the system state of the Beidou short message, and when the system state is fixed, the value is a fixed value, unit dB, and A=15 dB is given to any user terminal according to the current system state of the Beidou short message;
p: the difference between the power of the inbound signal sent by the terminal from the port surface of the transmitting antenna and 0dBW is in dB;
g: receiving antenna gain by a terminal in dB;
b: polarization loss, noise coefficient and processing loss are integrated, and the unit dB is obtained;
S24, selecting corresponding information rate for inbound according to the calculated inbound carrier-to-noise ratio CN0 s and the demodulation threshold under different inbound information rates, and obtaining the demodulation threshold of different inbound information rates of the Beidou short message system shown in FIG. 2
When 35dBHz is less than or equal to CN0 s, the inbound rate is selected to be 2kbps;
when 32dBHz is less than or equal to CN0 s < 35dBHz, the inbound rate is selected to be 1kbps,
When CN0 s is less than 32dBHz, the central station system may not be normally demodulated;
The invention discloses a blind demodulation method for a Beidou short message center station, which comprises the following steps:
S31, receiving an inbound signal sent by a user terminal by a Beidou short message center station, and performing stable capturing and tracking processing on the inbound signal;
s32, the central station receiving equipment demodulates and decodes the inbound signals, respectively traverses N different inbound information rates, and N=2 for the current Beidou short message communication system, namely the current system has two different inbound information rates of 2kbps and 1kbps respectively;
S33, under N different information rates, only one type of successfully decoded inbound information can be finally decoded, and the successfully decoded inbound information is used as the inbound information actually sent by the user terminal; wherein the inbound information comprises: an outbound information rate indication.
Example 1:
The invention provides an information rate negotiation system in a Beidou short message system, which comprises: a central station and a user terminal;
The user terminal is used for executing the autonomous outbound information rate selection method of the Beidou short message user terminal and the inbound information rate selection method based on Beidou short message user terminal signal strength measurement, modulating the selected outbound information rate in an inbound signal, and sending the inbound signal at the selected inbound information rate;
The central station is used for receiving the inbound signals sent by the user terminal, executing the blind demodulation method of the Beidou short message center station and obtaining the inbound information sent by the user terminal.
Example 2:
the invention provides an information rate negotiation device in a Beidou short message system, which is used for a user terminal and comprises the following components: a transceiver module and a processing module;
The receiving and transmitting module is used for receiving signals from the Beidou satellite;
The processing module is used for executing the autonomous outbound information rate selection method of the Beidou short message user terminal and the inbound information rate selection method based on Beidou short message user terminal signal strength measurement, and processing Beidou short message outbound signals in signals received by the receiving and transmitting module to obtain the outbound information rate and the inbound information rate.
Example 3:
the invention provides an information rate negotiation device in a Beidou short message system, which is used for a central station and comprises the following components: a transceiver module and a processing module;
The receiving and transmitting module is used for receiving signals from the Beidou satellite;
and the processing module is used for executing the blind demodulation method of the Beidou short message center station, processing the Beidou short message inbound signals from the user terminal in the signals received by the receiving and transmitting module, and obtaining inbound information sent by the user terminal.
Example 4:
a computer program product comprising instructions that, when executed by a user terminal, cause the user terminal to perform an autonomous outbound information rate selection method of the beidou short message user terminal and an inbound information rate selection method based on beidou short message user terminal signal strength measurements.
Example 5:
A computer program product comprising instructions that, when executed by a central station, cause the central station to perform the beidou short message central station blind demodulation method.
The beneficial technical effects of the invention are as follows: the user terminal autonomously selects the outbound short message information rate according to the actual condition of receiving the short message outbound signal, and calculates the reasonable inbound short message information rate, so that the communication overhead of the system can be effectively reduced, and high-quality short message communication service is provided for the user.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (1)
1. The information rate negotiation system in the Beidou short message system is characterized by comprising the following components: a central station and a user terminal;
the user terminal is used for executing an autonomous outbound information rate selection method of the Beidou short message user terminal and an inbound information rate selection method based on Beidou short message user terminal signal strength measurement, modulating the selected outbound information rate in an inbound signal, and sending the inbound signal at the selected inbound information rate;
the central station is used for receiving the inbound signals sent by the user terminal, executing a Beidou short message central station blind demodulation method and obtaining inbound information sent by the user terminal;
wherein,
The autonomous outbound information rate selection method of the Beidou short message user terminal comprises the following steps of:
S11, the Beidou short message user terminal receives short message outbound signals forwarded by the central station through the Beidou satellite, and stable tracking of the signals is achieved;
S12, demodulating and decoding the outbound signal according to the information rate indication in the received outbound signal by the Beidou short message user terminal, and recording all the information rates which can be decoded correctly to form a set { R i };
s13, selecting the highest information rate R max=max{Ri from the outbound information rates { R i } which can be correctly demodulated and decoded as an outbound information rate indication of the communication, modulating the information in an inbound signal, and forwarding the information to a central station of a Beidou short message communication system through a Beidou satellite;
s14, the central station of the Beidou short message communication system receives the inbound signals of the user, obtains outbound information rate indication information selected by the user, and modulates and transmits the outbound information according to the information;
the inbound information rate selection method based on Beidou short message user terminal signal strength measurement comprises the following steps of:
S21, receiving short message outbound signals by the Beidou short message user terminal to obtain an estimated value CN0 r of the outbound signal carrier-to-noise ratio;
s22, selecting a satellite with the largest estimation amount CN0 r of the carrier-to-noise ratio of the outbound signal as an inbound forwarding satellite;
S23, calculating the carrier-to-noise ratio of an inbound link according to the relative relation of link budget between a central station and a user terminal in a Beidou short message by using an estimated amount CN0 r of the carrier-to-noise ratio of an outbound signal, wherein the specific method comprises the following steps of:
CN0s = CN0r+A+P-G-B；
Wherein A is: when the power of an inbound signal transmitted by a user terminal is 0dBW, the corresponding conversion nominal difference between an inbound link and an outbound link depends on the system state of the Beidou short message, and when the system state is fixed, A=15 dB is applied to any user terminal;
p: the difference between the power of the inbound signal sent by the terminal from the port surface of the transmitting antenna and 0dBW is in dB;
g: receiving antenna gain by a terminal in dB;
b: polarization loss, noise coefficient and processing loss are integrated, and the unit dB is obtained;
S24, selecting a corresponding information rate for inbound according to the calculated carrier-to-noise ratio CN0 s of the inbound link and demodulation thresholds under different inbound information rates;
wherein,
In the step S24, according to demodulation thresholds of the beidou short message system under different inbound information rates, it can be known that
When 35dBHz is less than or equal to CN0 s, the inbound rate is selected to be 2kbps;
when 32dBHz is less than or equal to CN0 s and less than 35dBHz, the inbound rate is selected to be 1kbps;
when CN0 s is smaller than 32dBHz, the central station system cannot demodulate normally;
The blind demodulation method for the Beidou short message center station comprises the following steps:
S31, receiving an inbound signal sent by a user terminal by a Beidou short message center station, and performing stable capturing and tracking processing on the inbound signal;
s32, the central station receiving equipment demodulates and decodes the inbound signals, and traverses N different inbound information rates respectively;
S33, under N different information rates, only one type of successfully decoded inbound information can be finally decoded, and the successfully decoded inbound information is used as the inbound information actually sent by the user terminal; wherein the inbound information comprises: an outbound information rate indication;
wherein,
In the step S32, for the beidou short message communication system, n=2, that is, the current system shares two different inbound information rates, namely, 2kbps and 1kbps, respectively.
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| CN115706605A (en) * | 2021-08-06 | 2023-02-17 | 华为技术有限公司 | Inbound scheduling method and related device in Beidou communication system |
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