CN105812046B - A kind of realization system and method for satellite mobile communication system heartbeat message - Google Patents
A kind of realization system and method for satellite mobile communication system heartbeat message Download PDFInfo
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Abstract
A kind of realization system and method for satellite mobile communication system heartbeat message, system includes ground control centre and subscriber computer, ground control centre is that subscriber computer matches the corresponding control parameter of docking station heartbeat message, and user geographical location is calculated according to the heartbeat message received, transmission power adjustment amount, and update subscriber computer state, the heartbeat message control parameter of configuration and/or the user location calculated according to heartbeat message and/or transmission power adjustment amount result are then sent to subscriber computer；Subscriber computer receives the heartbeat message control parameter of ground control centre configuration, and is indicated according to heartbeat message transmission unit, sends heartbeat message.By subscriber computer send inbound heartbeat message, ground control centre can quickly, obtain user location, transmission power and status information in real time；And the expense of heartbeat signaling is reduced while ensureing certain power control accuracy；Simultaneously as heartbeat message bit length is very short, be conducive to enhance user's battery life and cruising ability.
Description
Technical Field
The invention relates to the technical field of satellite mobile communication, in particular to a method for realizing heartbeat messages of satellite mobile communication.
Background
The satellite mobile communication system mainly comprises a space section, a ground control center and a user section, wherein the space section comprises a satellite constellation comprising a plurality of satellites, and the satellites (outbound transponders and inbound transponders) are used for retransmitting outbound signals sent by the ground center station and inbound signals sent by a user machine. The ground control center completes the receiving and sending measurement of the user signal and the receiving and sending processing of the information, and manages and controls the operation of the whole system. The user segment is a user terminal with satellite signal receiving and transmitting functions, receives data services and control messages from a ground control center, and transmits inbound messages according to self service requirements and outbound control signaling to realize the functions of positioning, timing, short message communication and the like.
In the field of satellite communication, the transmission power of the subscriber station is important, and the accuracy of power control will affect the following two requirements: 1. sufficient transmit energy per bit to achieve Quality of Service (Quality of Service); 2. minimizing interference to other users of the system and maximizing user equipment battery life/endurance requirements. To achieve this, the user equipment transmit power control must adapt to the radio propagation channel characteristics, including path loss, shadow fading, fast fading, and other user equipment interference.
At present, a closed-loop power control method is often adopted by a communication system to control the transmitting power of user equipment. The uplink closed loop power control method comprises the following steps: closed loop power control requires both the network side and the user to complete. A feedback control loop exists in the closed loop power control process, and the network layer equipment receives the average carrier noise from the user equipmentRatio (C/N)means,ulAnd the required carrier to noise ratio (C/N)threshold,ulThe comparison gives a command that the user equipment needs to increase or decrease the transmission power. Specifically, if (C/N)means,ul<(C/N)threshold,ulThe network side sends a power control command for increasing the transmission power by a step value to the user equipment, and the user equipment increases the transmission power of the user equipment by the step value after receiving the command; otherwise, the network side device sends a power control command for reducing the transmission power value by a step value to the user device, and the user device reduces the transmission power of the user device by a step value after receiving the command. The network side and the user cycle back and forth according to the rule.
The closed loop power control can adapt to the channel change well, but needs the user equipment to send messages more frequently, and the network side equipment receives and measures the signal quality sent by the user equipment and then feeds back the power adjustment command to the user equipment, so that the change of the upper channel can be tracked in real time, but the signaling overhead of the user equipment is increased to a certain extent.
In addition, the inbound signal of the active Beidou first-term RDSS satellite communication system consists of 3 parts: a sync header, a service segment and a data segment. Wherein, the known pilot frequency sequence is modulated on the synchronous head for the central station to capture and track the incoming signal; modulating a control signaling of the inbound message on the service segment, wherein the control signaling is used for assisting the message demodulation of a subsequent data segment; the data segment bears the specific service content of the inbound information, and the bit length of the data segment is variable. It follows that each inbound message needs to carry a complete service segment regardless of the message type. For some inbound messages that need to be sent frequently, the service segment carries too much redundant information, which results in reduced user equipment battery life/endurance and reduced inbound capacity.
Disclosure of Invention
For satellite communication systems, it is necessary to reduce the signaling overhead of non-data traffic in order to improve the communication efficiency and inbound capacity of inbound messages. The invention provides a system and a method for realizing heartbeat messages of a satellite mobile communication system for a satellite communication system, and a ground control center can realize closed-loop power control, coarse positioning and state monitoring of a user machine in real time and rapidly according to the received heartbeat messages.
The technical scheme of the invention is as follows:
a realization system of heartbeat messages of a satellite mobile communication system is characterized by comprising a ground control center and a user machine, wherein the ground control center is used for configuring control parameters corresponding to inbound heartbeat messages for the user machine, calculating the geographical position of a user according to the received heartbeat messages, transmitting power adjustment quantity, updating the state of the user machine, and then transmitting the configured heartbeat message control parameters and/or the user position and/or the transmission power adjustment quantity result calculated according to the heartbeat messages to the user machine; and the user machine is used for receiving the heartbeat message control parameters configured by the ground control center and sending the heartbeat message according to the indication of the heartbeat message sending unit.
The ground control center comprises an inbound heartbeat message receiving unit, a heartbeat message control signaling configuration unit, a heartbeat message processing unit and a control parameter sending unit; the inbound heartbeat message receiving unit is used for receiving a heartbeat signal sent by the user machine; the heartbeat message control signaling configuration unit is used for configuring control parameters corresponding to the heartbeat signals for the user machine; the heartbeat message processing unit is used for processing the heartbeat message to obtain the position of the user machine, the adjustment quantity of the transmitting power and the state information of the satellite link; the control parameter sending unit is used for notifying the results of the heartbeat message control signaling configuration unit and the heartbeat message processing unit to the user machine;
the user machine comprises an outbound signal measuring unit, an outbound heartbeat message control signaling receiving unit, a heartbeat message timer unit and an inbound message sending unit; the outbound signal measuring unit is used for measuring the power level and/or the signal quality of the received downlink signal; the outbound heartbeat message control signaling receiving unit is used for analyzing the control signaling of the inbound heartbeat message sent by the ground central station; the heartbeat message timer unit is used for setting a heartbeat message sending period and a heartbeat message sending time; the inbound message sending unit is used for sending the heartbeat message and feeding back the sending time to the heartbeat message timer unit.
Based on the implementation system of the heartbeat message of the satellite mobile communication system, the invention also provides an implementation method of the heartbeat message of the satellite mobile communication system, which comprises the following steps: the user machine sends heartbeat messages periodically and/or triggered by events, the heartbeat messages comprise synchronization heads and service segments, and effective information of the service segments comprises user addresses and/or locked outbound beam numbers; after receiving the heartbeat message sent by the user machine, the ground control center carries out active positioning on the heartbeat message, thereby obtaining the geographical position of the user machine; or the ground control center obtains the adjustment quantity of the transmitting power of the user machine by calculating the quality of the heartbeat signal and determines whether to feed back the power adjustment quantity to the corresponding user machine, thereby realizing the closed-loop power control of the transmitting power of the user machine; or the ground control center rapidly obtains the satellite link state of the current user machine through the heartbeat message.
In the invention, the heartbeat message comprises a synchronization head and a service section, the synchronization head is used for capturing and tracking an inbound heartbeat signal by a ground central station, the service section message comprises a user address and a service beam, the user address is used for indicating the identity of a user, and the service beam is used for the active positioning of a user machine.
In the invention, the user machine sends the heartbeat message triggered by an event, namely when a heartbeat message timer unit of the user machine is overtime or service beams are switched, the user machine sends the heartbeat message, so that a ground control center can update the position, the transmitting power and the satellite link state information of the user machine; when the heartbeat message timer unit of the user machine does not time out and the service beam is not switched, the user machine does not send the heartbeat message.
In the invention, the method for restarting the heartbeat message timer unit of the user machine comprises the following steps: restarting a heartbeat message timer unit every time the user machine sends an inbound message, wherein the inbound message comprises a heartbeat message and a non-heartbeat message; when the heartbeat message timer unit is overtime, the user machine sends a heartbeat message and restarts the heartbeat message timer unit; or the heartbeat message timer unit is restarted every time the user machine sends a heartbeat message.
In the invention, the method for configuring the duration of the heartbeat message timer unit of the user machine comprises the following steps: the ground control center configures the duration of the heartbeat message timer unit according to the real-time online user number and the inbound traffic, and periodically broadcasts the updated duration of the heartbeat message timer unit to all the user machines through the outbound link; or the ground control center broadcasts the current system inbound traffic or inbound load condition to all users regularly, and the user machine determines the time length of the current heartbeat message timer according to the preset corresponding relation between the system inbound traffic or load condition and the time length of the heartbeat message timer.
In the present invention, the outbound signal measuring unit of the subscriber machine receives and measures the signal average power level < P > of each outbound beam in real timeiSum signal quality with carrier to noise ratio (CNR)iSignal to noise ratio (SNR)iIs expressed by (g); if the signal quality of the outbound beam with the best signal quality received by the user machine is higher than the signal quality of the current service beam by a specified threshold value, the following formula is satisfied:
〈SNRnon-serving beam, i〉-〈SNRService beam〉＞Threshold
Then the current serving beam will switch to the new outbound beam with the best signal quality.
In the invention, after receiving heartbeat messages sent by a user machine, a ground control center obtains the geographical position of the user machine by adopting an RDSS (remote data service system) positioning method, and the method comprises the following specific steps:
step 101: the ground control center receives multiple same inbound heartbeat messages forwarded by the user machine through different satellites i, and measures the arrival time of each inbound heartbeat messageInter TRx，iSo as to calculate the space propagation delay delta T required by the transmitting outbound signal to the receiving user machine to respond to the outbound signali：
Transmission-reception time difference Δ TiTime T of receiving user machine inbound signal by ground control centerRx，iTime of transmission of outbound message T by ground control centerTx
Step 102: the ground control center calculates the user position according to the following formula:
wherein (X)Control center,YControl center,ZControl center) Position coordinates of a ground control center; (X)i,Yi,Zi) As position coordinates of satellite i, X0,Y0,Z0) Satellite position coordinates to which outbound service beams belong for the user machine; (X)User machine,YUser machine,ZUser machine) And the position coordinates of the user machine to be solved are obtained.
In the invention, the ground control center obtains the adjustment quantity of the transmitting power of the user machine by calculating the quality of the heartbeat signal and determines whether to feed back the power adjustment quantity to the corresponding user machine, and the specific method comprises the following steps:
step 201: the ground control center calculates the carrier-to-noise ratio CNR corresponding to the inbound heartbeat messageReality (reality)Or signal-to-noise ratio SNRReality (reality)And to target carrier-to-noise ratio CNRTargetOr target signal-to-noise ratio SNRTargetComparing, the difference is the user machine transmitting power adjustment quantity delta P:
ΔP＝CNRtarget–CNRReality (reality)
Or, Δ P ═ SNRTarget–SNRReality (reality)
Δ P is a positive number indicating that the user equipment needs to increase the transmission power, and Δ P is a negative number indicating that the user equipment needs to decrease the transmission power;
step 202: the ground control center determines whether to feed back the adjustment quantity of the transmitting power to the corresponding user machine according to the current outbound channel resource and the size of the delta P;
if the absolute value of the delta P is lower than the threshold value M, namely the absolute value of the delta P is less than or equal to M, the ground control center does not feed back the adjustment quantity of the transmitting power of the corresponding user machine; and if the | delta P | is larger than M, the ground control center sends the adjustment amount according to the specified quantization precision.
The invention has the beneficial effects that:
the user machine sends the inbound heartbeat message, and the ground control center can quickly acquire the position, the transmitting power and the state information of the user in real time; moreover, the cost of heartbeat signaling can be reduced while certain power control accuracy is ensured; meanwhile, the heartbeat message bit length is very short, so that the service life and the endurance of a user machine battery are favorably prolonged.
Drawings
Fig. 1 is a schematic diagram of a text structure of a heartbeat message sent by a user equipment according to an embodiment of the present invention
Fig. 2 is a schematic diagram of a workflow of a heartbeat signal sending unit of a user equipment according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating that the ground control center calculates the geographical location of the user machine by using an RDSS positioning method after receiving the heartbeat message of the user machine according to the embodiment of the present invention;
fig. 4 is a flowchart of calculating a power adjustment amount of a user machine after a ground control center receives a heartbeat message of the user machine according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a client according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a ground control center according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a heartbeat messaging system according to an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic textual structure diagram of a heartbeat message sent by a user equipment according to the present invention, where the heartbeat message includes 2 parts, a synchronization header and a service segment. The synchronization head is used for capturing and tracking the inbound heartbeat signal by the ground central station, and the service section message contains a user address (used for indicating the identity of the user) and a service beam (used for the active positioning of the user machine).
Fig. 2 is a schematic diagram of a workflow of sending heartbeat messages by a user equipment according to the present invention, which includes the following functions:
whether the user machine sends the heartbeat message is determined by whether the timer unit of the heartbeat message of the user machine is overtime or not and whether the service beam is switched or not.
When the timer unit of the heartbeat message of the user machine is overtime or the service beam is switched, the user machine sends the heartbeat message, so that the ground control center can update the position, the transmitting power and the state information of the satellite link. When the user machine heartbeat message timer unit does not time out and the service beam is not switched, the user machine does not send heartbeat messages.
On one hand, the method for restarting the heartbeat message timer unit of the user machine comprises the following steps:
restarting a heartbeat message timer every time the user machine sends an inbound message, wherein the inbound message comprises a heartbeat message and a non-heartbeat message; when the heartbeat message timer times out, the user machine sends a heartbeat message and restarts the heartbeat message timer.
Or,
the heartbeat message timer is restarted each time the user machine sends a heartbeat message.
Further, the method for configuring the duration of the heartbeat message timer of the user equipment may be:
the ground control center configures the duration of the heartbeat message timer according to the real-time number of online users and the inbound traffic, and periodically broadcasts the updated heartbeat message timer duration to all the user machines through the outbound link. For example, if the current inbound traffic is large and the number of online users is large, a long duration of the heartbeat message timer can be configured to avoid inbound congestion; otherwise, a shorter heartbeat message timer duration may be configured.
Or,
the ground control center broadcasts the current system inbound flow or inbound load condition to all users regularly, and the user machine determines the time length of the current heartbeat message timer according to the preset corresponding relation between the system inbound flow or load condition and the time length of the heartbeat message timer.
Or,
the user machine determines the time length of the heartbeat message timer according to the current heartbeat message timer time length broadcasted by the ground control center, or the system inbound flow or inbound load condition and combining the self state of the user machine, and the finally determined heartbeat message timer time length is not lower than the timer time length recommended by the ground control center. The user machine state may be a current battery remaining amount, a set power usage mode, a geographical environment, and the like. For example, when the current remaining power of the user equipment is lower than a certain threshold, the user equipment may select a time length longer than the time length of the timer recommended by the ground control center in order to save power; or when the user machine is set to the power saving mode, the user machine can also select the time length longer than the time length of the timer recommended by the ground control center; or when the user machine detects that the outbound channel quality state is stable for a long time, which is often the case with a fixed user machine or a user machine moving slowly and in an open area, the user machine may also select a time length longer than the time length of the timer recommended by the ground control center. Since the states of the user equipments may be different, the heartbeat message timer durations of the user equipments may also be different.
On the other hand, the switching method of the outbound service beam of the user machine is as follows:
the outbound signal quality measuring unit of the subscriber machine receives and measures the signal average power level (P) of each outbound beam in real timeiAnd signal quality, which may be carrier to noise ratio (CNR)iSignal to noise ratio (SNR)iIs shown. If the signal quality of the outbound beam with the best signal quality received by the user machine is higher than the signal quality of the current service beam by a specified threshold value, the following formula is satisfied:
〈SNRnon-serving beam, i〉-〈SNRService beam〉＞Threshold
Then the current serving beam will switch to the new outbound beam with the best signal quality.
Fig. 3 is a flowchart of calculating the geographical location of the user machine by using the RDSS positioning method after the ground control center receives the heartbeat message of the user machine.
Step 101: the ground control center receives multiple same inbound heartbeat messages forwarded by the user machine through different satellites i, and measures the arrival time T of each inbound heartbeat messageRx，iSo as to calculate the space propagation delay delta T required by the transmitting outbound signal to the receiving user machine to respond to the outbound signali：
Transmission-reception time difference Δ TiTime T of receiving user machine inbound signal by ground control centerRx，iTime of transmission of outbound message T by ground control centerTx
Step 102: the ground control center calculates the user position according to the following formula:
wherein (X)Control center,YControl center,ZControl center) The position of the ground control center is a known value; (X)i,Yi,Zi) Is the position of satellite i, and (X)0,Y0,Z0) The satellite position to which the outbound service beam belongs for the user machine is also a known value; (X)User machine,YUser machine,ZUser machine) Is the user machine position to be solved.
Fig. 4 is a flow chart of the acquisition and processing of the user machine power adjustment by the ground control center after receiving the user machine heartbeat message.
Step 201: the ground control center calculates the carrier-to-noise ratio CNR corresponding to the inbound heartbeat messageReality (reality)Or signal-to-noise ratio SNRReality (reality)And to target carrier-to-noise ratio CNRTargetOr target signal-to-noise ratio SNRTargetComparing, the difference is the user machine transmitting power adjustment quantity delta P:
ΔP＝CNRtarget–CNRReality (reality)
Or, Δ P ═ SNRTarget–SNRReality (reality)
Δ P is a positive number indicating that the subscriber unit needs to increase the transmit power, and conversely, indicating that the subscriber unit needs to decrease the transmit power.
Step 202: and the ground control center determines whether to feed back the transmitting power adjustment quantity to the corresponding user machine according to the current outbound channel resource and the size of the delta P. If the outbound channel resource is tense or the absolute value of Δ P is lower than the threshold M, i.e., | Δ P | ≦ M, the ground control center may not feedback the transmit power adjustment for the corresponding user equipment. If the outbound channel resources are sufficient and | Δ P | > M, the ground control center sends the adjustment amount with a certain quantization granularity, for example, if M is 3dB, the quantization granularity is 0.5dB, and | Δ P | > 3.61, then the power adjustment amount is 3.5 dB.
In addition, the ground control center can obtain the latest service beam number from the inbound heartbeat message, and can be used for updating the service beam number information in the state of the user machine, preferably as the outbound beam of the user machine.
In the embodiment of the invention, the inbound heartbeat message is sent by the user machine, and the ground control center can quickly acquire the position, the transmitting power and the state information of the user in real time. Compared with non-heartbeat messages, the heartbeat message bit length is very short, and the service life and the endurance of a user machine battery are favorably enhanced.
It will be understood by those skilled in the art that all or part of the steps in the above embodiments may be implemented by hardware related to program instructions, and the above program may be stored in a computer readable storage medium, which may be ROM/RAM, magnetic disk, optical disk, etc.
Fig. 5 shows a user equipment according to an embodiment of the present invention, which is capable of implementing the method for implementing the heartbeat message in the satellite mobile communication system according to the foregoing method embodiment of the present invention. The user machine includes: the system comprises an outbound signal quality measuring unit, an outbound heartbeat message control signaling receiving unit, a heartbeat message timer unit and an inbound signal sending unit. Wherein: the system comprises an outbound signal quality measuring unit, a receiving unit and a sending unit, wherein the outbound signal quality measuring unit is used for measuring the signal power level and/or the signal quality of each received outbound beam, and if the outbound beam with the best signal quality received by a user machine is higher than the signal quality of the current service beam by a specified threshold value, the current service beam is switched to the outbound beam with the best signal quality, and meanwhile, the inbound signal sending unit is triggered to send a heartbeat message; the system comprises an outbound heartbeat message control signaling receiving unit, a receiving unit and a sending unit, wherein the outbound heartbeat message control signaling receiving unit is used for analyzing control signaling of an inbound heartbeat message sent by a ground central station so as to configure the duration of a heartbeat message timer; the heartbeat message timer unit is used for setting a heartbeat message sending period and a heartbeat message sending time, triggering the inbound signal sending unit when the heartbeat message timer is overtime, sending the heartbeat message and restarting the heartbeat message timer; and the inbound signal sending unit triggers the inbound signal sending unit to send the heartbeat message when the beam switching occurs or the heartbeat message timer is overtime, and simultaneously feeds back the sending time to the heartbeat message timer unit to immediately restart the heartbeat message timer.
Fig. 6 shows a ground control center according to an embodiment of the present invention, which is capable of implementing the method for implementing the heartbeat message in the satellite mobile communication system according to the above-mentioned method embodiment of the present invention. The ground control center comprises an inbound heartbeat message receiving unit, a heartbeat message control signaling configuration unit, a heartbeat message processing unit and a control parameter sending unit. The inbound heartbeat message receiving unit is used for receiving a heartbeat signal sent by the user machine; the heartbeat message control signaling configuration unit is used for configuring control parameters corresponding to the heartbeat signals for the user machine; and the heartbeat message processing unit is used for processing the heartbeat message to obtain information such as the position of the user machine, the adjustment amount of the transmitting power, the state of the satellite link and the like. And the control parameter sending unit is used for notifying the results of the heartbeat message control signaling configuration unit and the heartbeat message processing unit to the user equipment.
The embodiment of the invention also correspondingly provides a system for realizing the heartbeat message of the satellite mobile communication system, which comprises a ground control center and a user machine as shown in figure 7;
the ground control center is used for configuring control parameters corresponding to the inbound heartbeat messages for the user machine, calculating the geographical position of the user according to the received heartbeat messages, transmitting power adjustment amount, updating the state of the user machine, and then sending the configured heartbeat message control parameters and/or the user position and/or the transmission power adjustment amount result calculated according to the heartbeat messages to the user machine;
and the user machine is used for receiving the heartbeat message control parameters configured by the ground control center and sending the heartbeat message according to the indication of the heartbeat message sending unit.
It is to be expressly understood that the drawings and the related description are only for the purpose of illustrating the principles of the invention and are not intended as a definition of the limits of the invention. For example, the message names and entities in the embodiments of the present invention may vary from network to network, and some messages may be omitted. Therefore, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention are included in the protection scope of the present invention. While the invention has been shown and described with reference to an embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A realization system of heartbeat messages of a satellite mobile communication system is characterized by comprising a ground control center and a user machine, wherein the ground control center is used for configuring control parameters corresponding to inbound heartbeat messages for the user machine, calculating the geographical position of a user according to the received heartbeat messages, transmitting power adjustment quantity and updating the state of the user machine, and then transmitting the configured heartbeat message control parameters and/or the user position and/or the transmission power adjustment quantity calculated according to the heartbeat messages to the user machine; the user machine is used for receiving the heartbeat message control parameters configured by the ground control center and sending heartbeat messages according to the heartbeat message control parameters; the ground control center comprises an inbound heartbeat message receiving unit, a heartbeat message control signaling configuration unit, a heartbeat message processing unit and a control parameter sending unit; the inbound heartbeat message receiving unit is used for receiving a heartbeat signal sent by the user machine; the heartbeat message control signaling configuration unit is used for configuring control parameters corresponding to the heartbeat signals for the user machine; the heartbeat message processing unit is used for processing the heartbeat message to obtain the position of the user machine, the adjustment quantity of the transmitting power and the state information of the satellite link; the control parameter sending unit is used for notifying the results of the heartbeat message control signaling configuration unit and the heartbeat message processing unit to the user machine;
the user machine comprises an outbound signal quality measuring unit, an outbound heartbeat message control signaling receiving unit, a heartbeat message timer unit and an inbound signal sending unit; the outbound signal quality measuring unit is used for measuring the power level and/or the signal quality of the received downlink signal; the outbound heartbeat message control signaling receiving unit is used for analyzing the control signaling of the inbound heartbeat message sent by the ground central station; the heartbeat message timer unit is used for setting a heartbeat message sending period and a heartbeat message sending time; the inbound signal sending unit is used for sending the heartbeat message and feeding back the sending time to the heartbeat message timer unit.
2. A method for realizing heartbeat messages of a satellite mobile communication system is characterized by comprising the following steps: the user machine sends heartbeat messages periodically and/or triggered by events, the heartbeat messages comprise synchronization heads and service segments, and effective information of the service segments comprises user addresses and/or locked outbound beam numbers;
after receiving the heartbeat message sent by the user machine, the ground control center carries out active positioning on the heartbeat message, thereby obtaining the geographical position of the user machine, and the method comprises the following steps:
step 101: the ground control center receives multiple same inbound heartbeat messages forwarded by the user machine through different satellites i, and measures the arrival time T of each inbound heartbeat messageRx，iTo calculate the transmitting outbound signal to the receivingSpatial propagation delay deltat to subscriber units in response to their outbound signalsi：
Transmission-reception time difference Δ TiTime T of receiving user machine inbound signal by ground control centerRx，iTime of transmission of outbound message T by ground control centerTx
Step 102: the ground control center calculates the user position according to the following formula:
wherein (X)Control center,YControl center,ZControl center) Position coordinates of a ground control center; (X)i,Yi,Zi) As position coordinates of satellite i, X0,Y0,Z0) Satellite position coordinates to which outbound service beams belong for the user machine; (X)User machine,YUser machine,ZUser machine) The position coordinate of the user machine to be solved is obtained;
or the ground control center obtains the adjustment quantity of the transmitting power of the user machine by calculating the quality of the heartbeat signal and determines whether to feed back the power adjustment quantity to the corresponding user machine, thereby realizing the closed-loop power control of the transmitting power of the user machine;
or the ground control center rapidly obtains the satellite link state of the current user machine through the heartbeat message.
3. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 2, wherein: the heartbeat message comprises a synchronization head and a service section, the synchronization head is used for capturing and tracking an inbound heartbeat signal by a ground central station, the service section message comprises a user address and a service beam, the user address is used for indicating the identity of a user, and the service beam is used for the active positioning of a user machine.
4. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 3, wherein: the user machine sends heartbeat messages triggered by events, namely when a heartbeat message timer unit of the user machine is overtime or service beams are switched, the user machine sends the heartbeat messages, so that a ground control center can update the position, the transmitting power and the satellite link state information of the user machine; when the heartbeat message timer unit of the user machine does not time out and the service beam is not switched, the user machine does not send the heartbeat message.
5. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 4, wherein: the method for restarting the heartbeat message timer unit of the user machine comprises the following steps: restarting a heartbeat message timer unit every time the user machine sends an inbound message, wherein the inbound message comprises a heartbeat message and a non-heartbeat message; when the heartbeat message timer unit is overtime, the user machine sends a heartbeat message and restarts the heartbeat message timer; or the heartbeat message timer unit is restarted every time the user machine sends a heartbeat message.
6. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 4, wherein: the method for configuring the duration of the heartbeat message timer unit of the user machine comprises the following steps: the ground control center configures the duration of the heartbeat message timer unit according to the real-time online user number and the inbound traffic, and periodically broadcasts the updated duration of the heartbeat message timer unit to all the user machines through the outbound link; or the ground control center broadcasts the current system inbound traffic or inbound load condition to all users regularly, and the user machine determines the time length of the current heartbeat message timer according to the preset corresponding relation between the system inbound traffic or load condition and the time length of the heartbeat message timer.
7. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 4, wherein: an outbound signal quality measurement unit of the subscriber unit receives and measures in real time the signal average power level of each outbound beam<Pi>And the quality of the signal, and the signal,carrier to noise ratio for signal quality<CNRi>Or signal to noise ratio<SNRi>To represent; if the outbound beam with the best signal quality received by the subscriber unit is higher than the signal quality of the current serving beam by a predetermined Threshold, the following equation is satisfied:
<SNRnon-serving beam, i>-<SNRService beam>＞Threshold
Then the current serving beam will switch to the new outbound beam with the best signal quality.
8. The method for implementing heartbeat messages in a satellite mobile communication system as claimed in claim 2, wherein: the ground control center obtains the adjustment quantity of the transmitting power of the user machine by calculating the quality of the heartbeat signal, and determines whether to feed back the power adjustment quantity to the corresponding user machine, and the specific method comprises the following steps:
step 201: the ground control center calculates the carrier-to-noise ratio CNR corresponding to the inbound heartbeat messageReality (reality)Or signal-to-noise ratio SNRReality (reality)And to target carrier-to-noise ratio CNRTargetOr target signal-to-noise ratio SNRTargetComparing, the difference is the user machine transmitting power adjustment quantity delta P:
ΔP＝CNRtarget–CNRReality (reality)
Or, Δ P ═ SNRTarget–SNRReality (reality)
Δ P is a positive number indicating that the user equipment needs to increase the transmission power, and Δ P is a negative number indicating that the user equipment needs to decrease the transmission power;
step 202: the ground control center determines whether to feed back the adjustment quantity of the transmitting power to the corresponding user machine according to the current outbound channel resource and the size of the delta P;
if the absolute value of the delta P is lower than the threshold value M, namely the absolute value of the delta P is less than or equal to M, the ground control center does not feed back the adjustment quantity of the transmitting power of the corresponding user machine; and if the absolute value delta P is larger than M, the ground control center sends the adjustment amount according to the set quantization precision.
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| CN107018494A (en) * | 2017-04-25 | 2017-08-04 | 广东兆邦智能科技有限公司 | Thermal map generates system and thermal map generation base station and heartbeat dispensing device |
| CN109474937A (en) | 2017-09-08 | 2019-03-15 | 索尼公司 | Wireless communications method and wireless telecom equipment |
| CN111106865B (en) | 2018-10-25 | 2021-12-14 | 华为技术有限公司 | Communication method, device and system based on satellite network |
| CN111049569B (en) * | 2019-12-25 | 2024-02-09 | 中电科航空电子有限公司 | Airborne Beidou equipment, parameter updating method thereof and command control system |
| CN115149992A (en) * | 2021-04-09 | 2022-10-04 | 刘道选 | System and method for offshore over-the-horizon microwave wireless transmission based on algorithm |
| CN114500314A (en) * | 2021-12-30 | 2022-05-13 | 中国电信股份有限公司卫星通信分公司 | Method for realizing satellite communication flow statistics according to beam numbers |
| CN116760457B (en) * | 2023-08-17 | 2023-10-31 | 成都本原星通科技有限公司 | Resource allocation method based on satellite battery life |
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