CN113472424A - Different-frequency measurement switching device for ephemeris-assisted flexible switch multi-satellite coverage area - Google Patents
Different-frequency measurement switching device for ephemeris-assisted flexible switch multi-satellite coverage area Download PDFInfo
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Abstract
The device for measuring and switching the pilot frequency of the multi-satellite coverage area of the ephemeris-assisted flexible switch disclosed by the invention has stable performance and free switching, can avoid ping-pong switching and reduce the loss of communication gain. The invention is realized by the following technical scheme: the ephemeris processing unit calculates the time range of the satellite terminal entering and leaving the multi-satellite overlapping area according to the ephemeris and the satellite beam coverage parameters, and calculates the time for switching to the adjacent beam; the base band processing unit controls pilot frequency measurement through a pilot frequency measurement switch process, closes the measurement outside a non-multi-satellite overlapping time range, sets the best channel quality for deceiving a satellite/gateway station in a pseudo measurement report to the adjacent beam switching time, judges that a satellite terminal is switched to the adjacent beam, opens the measurement in the multi-satellite overlapping time, and adjusts a measurement trigger threshold and a reporting condition; when the satellite terminal arrives at the moment of leaving the inter-satellite overlapping range, the satellite terminal is not switched to the next satellite, and a pseudo-measurement report of the next satellite beam is directly filled and reported.
Description
Technical Field
The invention belongs to the field of low-orbit satellite communication, and particularly relates to a device for measuring and switching pilot frequency of a multi-satellite coverage area of a ephemeris-assisted flexible switch.
Technical Field
In terrestrial mobile communications, measurement of neighboring cells is an indispensable procedure for a terminal to establish good communication with a base station. The User Equipment (UE) in a connected state needs to measure the serving cell and the neighboring cell, and then whether the serving cell and the neighboring cell meet the reporting condition is evaluated according to the measurement result. And the base station makes a decision whether to switch or not according to the measurement report of the UE. The adjacent cell may be a co-frequency cell or a pilot frequency cell. The co-channel cell refers to a neighboring cell having the same frequency as the serving cell of the UE. The inter-frequency cell is a neighboring cell having a different frequency from a serving cell of the UE. The pilot frequency means that the central frequency points of two adjacent cells are not consistent. The cell measurement in the system comprises two types of measurement of same frequency and different frequency, and the cell measurement types of different networking modes of the system are different. In a system of same-frequency networking, cell measurement initiated by a terminal is same-frequency measurement; in the system of the pilot frequency networking, cell measurement initiated by a terminal is pilot frequency measurement, and the switching of the terminal between adjacent cells is pilot frequency switching. When measuring the co-frequency cell, the UE may receive the reference signal of the co-frequency cell while receiving the signal of the serving cell, so as to evaluate whether the signal quality of the co-frequency cell meets the reporting condition. In the pilot frequency measurement, relative to the same frequency measurement, a terminal without a dual receiver usually needs to leave a pilot frequency measurement GAP (GAP) on a communication time slot for measurement of pilot frequency signals, but communication data transmission needs to be interrupted during the pilot frequency measurement, the GAP needs to be started for the pilot frequency adjacent cell measurement, and throughput is reduced. When the UE measures the pilot frequency cell, the UE firstly tunes the center frequency of the radio frequency in the GAP to the frequency of the pilot frequency cell, and then the UE can measure the corresponding pilot frequency cell. After the measurement is finished, the UE needs to tune the center frequency of the radio frequency to the frequency of the serving cell again, so that the UE can receive signals in the serving cell. Since communication with the serving cell cannot be performed in the inter-frequency measurement GAP, the data transmission rate of the UE is greatly affected during the measurement of the inter-frequency cell.
In a low-earth-orbit satellite communication system, a beam frequency division mode is often adopted to cover the ground networking, namely a system covered by pilot frequency networking. In the low-orbit satellite communication system, the satellite terminal measures the adjacent cells initiated by the adjacent cells in all different frequency measurements. The frequency of cell measurement initiation is mainly influenced by the mobility of the satellite terminal, and the measurement GAP caused by the mobility of the satellite terminal has little influence on the resource scheduling frequency of the communication time slot of the satellite terminal. Compared with a ground mobile communication system, the satellite communication system has large channel model difference, the satellite communication is more dependent on a direct path signal component, and a satellite terminal of the satellite communication is not an omnidirectional antenna. Therefore, in low-orbit satellite communication, the high-speed movement of the satellite and the fluctuation in the movement of the satellite terminal cause the satellite terminal to frequently trigger the measurement of the adjacent cell, which can reach 50 times/s under the worst condition, and the communication rate of a user is reduced by 20 percent according to the configuration of the GAP.
Aiming at frequent pilot frequency measurement in low earth orbit satellites, the method is mainly realized by the following methods: the method has the advantages that the phased array antenna is adopted, modification can be carried out through parameter configuration, the operation is simple and easy, and the defects that the beam gain is reduced, the EIRP and G/T indexes of the satellite terminal are reduced, and the communication rate of a user is reduced are overcome; secondly, raising the pilot frequency measurement trigger threshold to adapt to small-scale fluctuation of signal quality of the current cell, and the method has the advantages of modification through parameter configuration, simplicity and easiness in operation, and has the defects that in the directional switching process caused by rapid movement of a low-earth orbit satellite, the process of switching from a user to a target beam is delayed, and the communication rate of a satellite terminal is reduced in a period of time; thirdly, the gateway station side lengthens the pilot frequency measurement period through the measurement configuration information, and has the advantages that the parameter configuration is carried out based on the existing signaling, and the defect that the fast sliding of the wave beam caused by the high-speed movement of the low-orbit satellite cannot be adapted; and fourthly, performing the measurement based on the cooperation of ephemeris calculation and pilot frequency measurement, wherein the ephemeris calculation is taken as a first criterion and the pilot frequency measurement is taken as a second criterion at present, so that the measurement method has the advantages of avoiding unnecessary pilot frequency measurement and having the defect of 'one-time cutting', and the differences of a single-satellite single-beam coverage area, a single-satellite multi-beam overlapping area and a multi-satellite coverage overlapping area are not fully considered.
The purpose of the satellite terminal for performing pilot frequency measurement in the continuous communication process is mainly to ensure that the satellite terminal can effectively probe the signal intensity of the adjacent cell when the link quality of the original cell is reduced, further trigger switching and ensure the communication continuity. In a low-earth orbit satellite communication system, because a single-beam coverage area in a single satellite can only be effectively covered by one beam, a satellite terminal cannot be switched to an adjacent beam, and therefore, the inter-frequency measurement triggered by link quality jitter caused by communication bump in the satellite terminal is meaningless in the range; in the overlapping area of the adjacent wave beams in the satellite, because the shielding and attenuation of the adjacent wave beam signals in a propagation channel almost simultaneously occur, even if the pilot frequency measurement is frequently triggered, the connected satellite terminal cannot provide effective guidance for the satellite terminal to switch to the adjacent wave beams, and in addition, the satellite terminal bumps to a certain frequency range to cause 'ping-pong switching of cross wave beams in the satellite'; in a multi-satellite coverage overlapping area, the shielding and attenuation of adjacent satellite signals in a propagation channel are irrelevant, so that the pilot frequency measurement of a satellite terminal can better guide switching, but frequent pilot frequency measurement and cross-satellite ping-pong switching are easy to occur under the conditions of high-speed satellite movement and bumping of the satellite terminal.
Satellite ephemeris is an expression two-row orbital data system used to describe the position and velocity of a space vehicle. The satellite ephemeris determines various parameters such as time, coordinates, azimuth, speed and the like of a flight body according to the mathematical relation among 6 orbit parameters of Kepler's law, and has extremely high precision. The flight path of the satellite can be predicted in advance based on the satellite ephemeris, the terminal can predict the coverage of the satellite terminal by the satellite beam by combining the position of the terminal and the satellite beam coverage parameter, and the specific time of the satellite terminal in a satellite single-beam coverage area, a single-satellite multi-beam overlapping area and a multi-satellite coverage overlapping area in a future period of time can be directly calculated. The satellite ephemeris information can be acquired by the satellite terminal through two modes, firstly, the satellite transmits the ephemeris information in a broadcasting mode, and the satellite ephemeris information can be acquired by the satellite terminal through analyzing a broadcasting signal; and secondly, the health and security terminal is injected in a mode of external USB and the like.
Disclosure of Invention
In order to solve the problem of frequent pilot frequency measurement caused by high-speed satellite movement and satellite terminal communication bump in a low-orbit satellite system and avoid ping-pong switching, the invention provides a ephemeris-assisted flexible switch multi-satellite coverage area pilot frequency measurement switching device which has stable performance, free switching and convenient use, can reduce the occurrence frequency of pilot frequency measurement, avoid ping-pong switching, reduce communication gain loss and achieve good user service continuity experience.
In order to achieve the above object, the present invention provides a device for switching between different frequency measurements in a multi-satellite coverage area with ephemeris assistance and flexibility, comprising: set up in satellite terminal, carry out ephemeris processing unit and baseband processing module that communicate through phased array antenna and satellite/gateway station, its characterized in that: the ephemeris processing unit calculates the time range of the satellite terminal entering the current satellite and the relative motion direction, the multi-satellite overlapping area of the adjacent satellite which does not pass through and the time range of the satellite terminal leaving the multi-satellite overlapping area according to the ephemeris, the satellite beam coverage parameters and the position of the satellite terminal, and the time of switching the adjacent beam which does not pass through of the satellite terminal in the relative motion direction at the current beam of the satellite terminal, encapsulates the interface message encapsulation format of the calculation result according to the interface message format, and sends the interface message encapsulation format to the baseband processing module; the baseband processing unit executes the pilot frequency measurement switch function flow according to the received ephemeris application resolving result and the measurement configuration received from the satellite/gateway station: in the time range of entering the multi-satellite overlapping area and leaving the multi-satellite overlapping area, the pilot frequency measurement is started through the pilot frequency measurement switch, and meanwhile, the pilot frequency measurement trigger threshold and the RSRP measurement reporting condition are adjusted in the multi-satellite coverage area; the pilot frequency measurement is closed in a single satellite coverage area, adjacent beam numbers which do not pass through in the relative movement direction are filled at the beam switching time of the single satellite coverage area, the optimal channel quality for deceiving a satellite/gateway station side is set in a pseudo measurement report of the channel quality, the satellite terminal is judged to be switched to the adjacent beam, and the pilot frequency measurement is closed on the premise of not changing a measurement switching mechanism; and if the satellite terminal is not switched to the next satellite when the satellite terminal arrives at the moment of leaving the inter-satellite overlapping range, directly filling a pseudo-measurement report for reporting the next satellite beam.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts an ephemeris processing unit and a baseband processing module which are arranged in a satellite terminal and are communicated with a satellite/gateway station through a phased array antenna to form an ephemeris auxiliary flexible switch multi-satellite coverage area pilot frequency measurement switching device, fully considers the difference of a single-satellite single-beam coverage area, a single-satellite multi-beam overlapping area and a multi-satellite coverage overlapping area in a low-orbit satellite communication scene, and opens pilot frequency measurement in the multi-satellite coverage overlapping area and closes the pilot frequency measurement in the single-satellite coverage area based on ephemeris auxiliary calculation without changing the existing mobile communication measurement and switching flow mechanism, and adds software functions and interface information on the basis of the existing architecture at the satellite terminal side, thereby having compatibility and operability. Under the condition of ensuring the switching performance, the frequency of occurrence of pilot frequency measurement can be reduced, ping-pong switching is avoided, the loss of communication gain is reduced, and good user service continuity experience is achieved.
Aiming at a communication-in-motion scene, a single-satellite coverage area closes a pilot frequency measurement function, an ephemeris processing unit is adopted to calculate the time range of a satellite terminal entering a multi-satellite overlapping area of a current satellite and an adjacent satellite which does not pass through in a relative motion direction and leaving the multi-satellite overlapping area and the time of switching the current beam of the satellite terminal to the adjacent beam which does not pass through in the relative motion direction according to ephemeris, satellite beam coverage parameters and self position, the ephemeris processing unit packages a resolving result according to an interface message format and sends the resolving result to a baseband processing module, so that 'ping-pong switching between beams' can be effectively avoided, and a pilot frequency measurement trigger threshold and a reporting condition are adjusted through the multi-satellite coverage area, so that 'ping-pong switching' can be effectively avoided. The signal quality of the user is guaranteed, and the user perception is improved.
Aiming at the problem of frequent pilot frequency measurement of satellite terminal communication in motion in a low-orbit satellite system and the defects of the existing scheme, the invention realizes ephemeris and beam coverage calculation by adding an interface between a satellite terminal ephemeris application unit and a baseband processing unit, and the interface between the satellite terminal ephemeris application unit and the baseband processing unit, closes pilot frequency measurement in a single-satellite coverage area, opens pilot frequency measurement in a multi-satellite coverage area, simultaneously adjusts a pilot frequency measurement trigger threshold and an RSRP measurement report trigger condition, finally reduces the occurrence frequency of pilot frequency measurement, avoids ping-pong switching and reduces the loss of communication gain.
The method solves the time length of the satellite terminal reaching the overlapping area and the time length of the satellite terminal leaving the overlapping area through the ephemeris application unit based on the ephemeris assisted geometry, and the moment when the current beam is switched to the adjacent beam which is not passed by in the relative movement direction, in the multi-satellite coverage overlapping area, the pilot frequency measurement is started through the pilot frequency measurement switch, and simultaneously the pilot frequency measurement trigger threshold and the RSRP measurement reporting condition are adjusted in the multi-satellite coverage area, the pilot frequency measurement is closed in the single satellite coverage area, the best channel quality for deceiving the satellite/gateway station side is set in the pseudo measurement report for filling the adjacent beam number and the channel quality, the satellite terminal is judged to switch to the adjacent beam, the pilot frequency measurement is closed under the premise of not changing the measurement switching mechanism, if the satellite terminal reaches the moment of leaving the inter-satellite overlapping range, and if the satellite beam is not switched to the next satellite, directly filling and reporting a pseudo measurement report of the next satellite beam. The method has the advantages that communication time slot overhead caused by frequent pilot frequency measurement is relieved, the whole-network-level pilot frequency switching optimization can be realized, the problem that two schemes based on measurement switching and ephemeris switching are independently used or coarsely used in a fusion manner in the existing low-earth orbit satellite communication is solved, the optimization efficiency of frequent pilot frequency switching of a low-earth orbit satellite communication system is improved, and the efficiency of cooperatively providing service for the redundant coverage area terminal by multiple satellites can be obviously improved.
Drawings
FIG. 1 is a schematic diagram of the construction of a switching device for measuring pilot frequency in a multi-satellite coverage area of an ephemeris-assisted flexible switch according to the invention;
FIG. 2 is a schematic diagram of relative movement moments of satellite terminals under satellite beam coverage;
FIG. 3 is a flow chart of the implementation of the pilot frequency measurement switch function of the baseband processing unit;
FIG. 4 is a schematic diagram of an interface message encapsulation format of the ephemeris application unit solution;
FIG. 5 is a schematic diagram of satellite beam coverage and current position of a satellite terminal for a low-earth-orbit satellite system in a case;
FIG. 6 is a fill-in diagram of interface information for transmitting only the switching time of the intra-satellite beams;
FIG. 7 is a schematic diagram of interface information filling for simultaneous transmission of intra-satellite beam switching time and inter-satellite overlap time range conditions;
fig. 8 is a process flow of the pilot measurement switch function of the baseband processing unit in the case.
The invention is further described with reference to the following figures and examples.
Detailed Description
See fig. 1. In a preferred embodiment described below, an ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement switching apparatus comprises: the ephemeris processing unit and the baseband processing module are arranged in the satellite terminal and are communicated with the satellite/gateway station through the phased array antenna. The ephemeris processing unit calculates the time range of the satellite terminal entering the current satellite and the relative motion direction, the multi-satellite overlapping area of the adjacent satellite which does not pass through and the time range of the satellite terminal leaving the multi-satellite overlapping area according to the ephemeris, the satellite beam coverage parameters and the position of the satellite terminal, and the time of switching the adjacent beam which does not pass through of the satellite terminal in the relative motion direction at the current beam of the satellite terminal, encapsulates the interface message encapsulation format of the calculation result according to the interface message format, and sends the interface message encapsulation format to the baseband processing module; the baseband processing unit executes the pilot frequency measurement switch function flow according to the received ephemeris application resolving result and the measurement configuration received from the satellite/gateway station: in the time range of entering the multi-satellite overlapping area and leaving the multi-satellite overlapping area, the pilot frequency measurement is started through the pilot frequency measurement switch, and meanwhile, the pilot frequency measurement trigger threshold and the RSRP measurement reporting condition are adjusted in the multi-satellite coverage area; the pilot frequency measurement is closed in a single satellite coverage area, adjacent beam numbers which do not pass through in the relative movement direction are filled at the beam switching time of the single satellite coverage area, the optimal channel quality for deceiving a satellite/gateway station side is set in a pseudo measurement report of the channel quality, the satellite terminal is judged to be switched to the adjacent beam, and the pilot frequency measurement is closed on the premise of not changing a measurement switching mechanism; and if the satellite terminal is not switched to the next satellite when the satellite terminal arrives at the moment of leaving the inter-satellite overlapping range, directly filling a pseudo-measurement report for reporting the next satellite beam.
See fig. 2. If the current TIME is t0, the TIME length of the satellite terminal reaching the position a entering the overlapping area along the relative movement direction is DATA _ TIME _ a, the TIME length of the satellite terminal reaching the position B leaving the overlapping area is DATA _ TIME _ B, the TIME entering the overlapping area is t0+ DATA _ TIME _ a, and the TIME OUT _ TIME leaving the overlapping area is t0+ DATA _ TIME _ B.
When the switching TIME of the intra-satellite BEAM is reached, the ephemeris application unit calculates the TIME of switching the current BEAM to the adjacent BEAM which is not passed through IN the relative motion direction, if the current TIME is t0, the upcoming TIME of switching the last cross-BEAM is changed to t0+0.5 x (BEAM _ OUT _ TIME + NEXT _ BEAM _ IN _ TIME), wherein BEAM _ OUT _ TIME is the calculated TIME of leaving the coverage range of the current BEAM, and NEXT _ BEAM _ IN _ TIME is the calculated TIME of entering the coverage range of the adjacent BEAM, and the TIME is sent to the baseband processing unit for inter-frequency measurement.
See fig. 3. The baseband processing unit judges whether the current TIME is in the inter-satellite overlapping TIME range according to the received calculation result message of the ephemeris application unit, if so, the cross-satellite pilot frequency measurement triggering threshold and the reference signal received power RSRP measurement reporting condition are adjusted according to the received measurement configuration information and the current wave beam signal strength fluctuation condition in the channel quality statistical TIME DATA _ TIME _ CON, the cross-satellite pilot frequency measurement threshold s _ Noninistreach is reduced, the measurement report reporting condition is set as that the current cell quality is lower than the pilot frequency measurement threshold for a duration longer than the continuous monitoring TIME DATA _ TIME _ TH reporting measurement report, whether the satellite terminal pilot frequency measurement is started or not is judged, if so, whether the current wave beam signal strength triggers the cross-satellite measurement or not is judged, if not, the pilot frequency measurement function is started, and then whether the current wave beam signal strength triggers the cross-satellite measurement threshold or not is judged, if the inter-satellite inter-beam switching time is not reached, filling and reporting a pseudo measurement report; otherwise, restarting to judge whether the pilot frequency measurement of the satellite terminal is started, if so, closing the pilot frequency measurement function, judging whether the current switching time between the satellite beams is reached, if so, filling and reporting a pseudo measurement report, and ending the program.
The contents filled in the pseudo measurement report are the adjacent wave beam number and the channel quality thereof, the channel quality is set to be optimal and is used for deceiving the satellite/gateway station side and judging the switching of the satellite terminal to the adjacent wave beam, thereby achieving the purpose of closing the pilot frequency measurement function under the condition of not changing the measurement switching mechanism. And if the satellite terminal is not switched to the next satellite when the satellite terminal arrives at the moment of leaving the inter-satellite overlapping range, directly filling a pseudo-measurement report for reporting the next satellite beam.
The reducing of the cross-satellite pilot frequency measurement threshold s _ noise is realized by the following formula: the signal strength of the current beam in the channel quality statistics TIME length DATA _ TIME _ CON fluctuates more severely, and the value of the current beam signal strength fluctuates more severely, so that the signal strength of the current beam in the channel quality statistics TIME length DATA _ TIME _ CON is larger.
See fig. 4. The interface message encapsulation format of the transmission calculation result is shown in fig. 4: the interface message for transmitting the calculation result includes: the method comprises four fields of a message type, a subclass identifier, a time number and a calculation time, wherein the message type field is represented by 8 bits, and a value 00001111 represents that an interface message is calculation information for assisting pilot frequency measurement; the subclass identification field is represented by 2 bits, the value 00 represents the inter-satellite overlapping area time class, the value 01 represents the intra-satellite beam switching time class, and the value 11 represents the mixing time class; the time number field represents the number of partially filled time at the resolving time by 6 bits, if the subclass identifier takes the value 00, the value of the time number field is converted into a decimal number which is an even number, if the subclass identifier takes the value 11, the first 2 bits of the time number field represent the resolving time number in the time range of the inter-satellite overlapping zone, and the last 4 bits of the time number field represent the resolving time number at the switching time of the intra-satellite wave beam; the resolving time field is represented by "time number 27" bits, wherein each time is represented by 27 bits for time minute second milliseconds, from front to back, 5 bits for 0 to 23 hours, 6 bits for 0 to 59 minutes, 6 bits for 0 to 59 seconds, and 10 bits for 0 to 999 milliseconds.
When the solution result shown IN fig. 2 is encapsulated according to the interface message format shown IN fig. 4, if the subclass identifier is set to 00, the first inter-satellite overlapping region entering TIME IN _ TIME, the first inter-satellite overlapping region leaving TIME OUT _ TIME, the second inter-satellite overlapping region entering TIME IN _ TIME, and the second inter-satellite overlapping region leaving TIME OUT _ TIME are successively filled until solution results of 0.5 × (number of TIMEs) of the overlapping regions of the satellite terminal are filled; if the subclass identifier is 01, filling the first cross-beam switching TIME HANDOVER _ TIME and the second cross-beam switching TIME HANDOVER _ TIME in sequence according to the smoothness until the calculation result is filled; if the subclass mark is 11, filling the inter-satellite overlapping time range for resolving the time, and filling the intra-satellite beam switching for resolving the time.
Example 1
See fig. 5. The height of a low-orbit satellite for providing service for a satellite terminal is 1200km, the satellite beam coverage is formed by arranging 8 beams in a line, the 3dB beam width of each beam is 8 degrees in the moving direction, and the ground coverage field angle of the satellite is +/-25 degrees; the satellite terminal moves at the speed of 60km/h, and the satellite beam sliding speed is far greater than the satellite terminal movement speed, so the satellite terminal movement speed can be ignored in the ephemeris application unit calculation; the satellite terminal obtains the current accurate position through a self-contained navigation module and converts the current accurate position to obtain (E102.910 degrees, N30.333 degrees and H500m degrees), and the ephemeris application unit converts the current position of the satellite S1 (E102.910 degrees, N31.901 degrees, H1200000m) and the current position of the satellite S2 (E102.910 degrees, N38.088 degrees and H1200000m) according to the latest ephemeris data.
The time length required for the ephemeris application unit to solve the satellite terminal future arrival positions C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 and A, B is estimated as follows:
if the current time t0 is 1 hour, 23 minutes, 11 seconds and 120 milliseconds, the ephemeris application unit calculates that the time range of the 1 st-5 th intra-satellite beam switching time as the first inter-satellite overlapping time in the future is the time range of the ephemeris application unit for interface message filling according to the calculation result.
Example 2
Refer to fig. 6. If the generated interface message only transmits intra-satellite beam switching instants, the fill interface message is defined as 0000111101000101000010101110101011001010110000010101111010100100011111000010110000000101111010000000010110000110000010000001000010110001011100011111110 according to the message interface.
Example 3
Refer to fig. 7. If the generated interface message needs to transmit the switching time of the beam in the satellite and the time range of the inter-satellite overlapping region at the same time, the interface message is filled into the range of the inter-satellite overlapping region according to the message interface definition
0000111111100101000010110000011010111101101000010110010011100001000110000010101110101011001010110000010101111010100100011111000010110000000101111010000000010110000110000010000001000010110001011100011111110。
Example 4
See fig. 8. After receiving the resolving result message, the baseband processing module analyzes the resolving result to obtain a resolving result, performs pilot frequency measurement switch control according to newly acquired information, when 1 hour reaches 23 minutes, 21 seconds and 598 milliseconds, judges that the current TIME t0 is 1 hour, 23 minutes, 21 seconds and 598 milliseconds are equal to the first inter-beam switching TIME HANDOVER1_ TIME, fills and reports a pseudo-measurement report, wherein the pseudo-measurement report comprises an adjacent beam number S1_ b4 and a channel quality maximum value 30, and after receiving the pseudo-measurement report, the satellite/gateway station initiates a switching process to the adjacent beam and switches to the adjacent beam S1_ b 4; when 1 hour 23 minutes 42 seconds 287 milliseconds are reached, judging that the current TIME t0 is equal to 1 hour 23 minutes 42 seconds 287 milliseconds and the second inter-beam switching TIME HANDOVER2_ TIME, filling and reporting a pseudo-measurement report, wherein the content of the pseudo-measurement report is an adjacent beam number S1_ b5 and a channel quality maximum value 30, and after receiving the pseudo-measurement report, the satellite/gateway station initiates a process of switching to the adjacent beam and switches to the adjacent beam S1_ b 5; when the TIME reaches 1 hour 24 minutes 2 seconds 976 milliseconds, judging that the TIME t0 is equal to 1 hour 24 minutes 2 seconds 976 milliseconds and the switching TIME HANDOVER3_ TIME between third-TIME beams is equal, filling and reporting a pseudo-measurement report, wherein the contents of the pseudo-measurement report are an adjacent beam number S1_ b6 and a channel quality maximum value 30, after receiving the pseudo-measurement report, a satellite/gateway station initiates a switching process to the adjacent beam, and the satellite terminal is switched to the adjacent beam S1_ b 6; when reaching 1 hour 24 minutes 13 seconds 493 milliseconds, judging that the current TIME t0 is 1 hour 24 minutes 13 seconds 493 milliseconds and the TIME range from 1 hour 24 minutes 13 seconds 493 milliseconds to 1 hour 25 minutes 14 seconds 70 milliseconds is met, determining a value of alpha according to the signal intensity fluctuation condition of a satellite terminal communication link of the former 5s (baseband parameter configuration default DATA _ TIME _ CON is 5s), adjusting a cross-satellite pilot frequency measurement threshold s _ NOpilot frequency is s _ NOpilot frequency-alpha x (s _ NOpilot frequency-min _ Demthreshold), setting a measurement report reporting condition as' the current cell quality is lower than s _ NOpilot frequency for more than 2 seconds, judging that the pilot frequency measurement is not started, opening a pilot frequency measurement switch, judging whether to trigger the cross-satellite measurement, judging that the cross-satellite measurement is not started, if not triggering the cross-satellite measurement, judging that the inter-satellite beam switching TIME 1 hour 24 minutes 24 seconds is not reached, continuously monitoring the beam intensity before reaching 129 seconds, and monitoring the current beam intensity before 129 seconds, executing a neighbor pilot frequency measurement process once a threshold is triggered; if the satellite terminal is switched to the adjacent satellite, the ephemeris processing unit calculates the moment of switching the adjacent beam which is not passed by the current beam of the satellite terminal in the relative motion direction aiming at the adjacent satellite, and repeats the process; when 1 hour is reached at 25 minutes, 14 seconds and 70 milliseconds, if the satellite terminal is still served by the satellite S1, the pseudo measurement report reporting the satellite S2 beam S2_ b3 is directly filled.
The above detailed description of the embodiments of the present invention, and the detailed description of the embodiments of the present invention used herein, is merely intended to facilitate the understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An ephemeris assisted flexible switch multi-satellite coverage area pilot frequency measurement switching device, comprising: set up in satellite terminal, carry out ephemeris processing unit and baseband processing module that communicate through phased array antenna and satellite/gateway station, its characterized in that: the ephemeris processing unit calculates the time range of the satellite terminal entering a multi-satellite overlapping area of a current satellite and an adjacent satellite which does not pass through in the relative motion direction and leaving the multi-satellite overlapping area according to the ephemeris, the satellite beam coverage parameters and the position of the satellite terminal, calculates the moment of switching the adjacent beam of the current beam of the satellite terminal which does not pass through in the relative motion direction, packages an interface message packaging format for transmitting a resolving result according to an interface message format, and sends the interface message packaging format to the baseband processing module; the baseband processing unit executes the pilot frequency measurement switch function flow according to the received ephemeris application resolving result and the measurement configuration received from the satellite/gateway station: in the time range of entering the multi-satellite overlapping area and leaving the multi-satellite overlapping area, the pilot frequency measurement is started through the pilot frequency measurement switch, and meanwhile, the pilot frequency measurement trigger threshold and the Reference Signal Received Power (RSRP) measurement reporting condition are adjusted in the multi-satellite coverage area; the pilot frequency measurement is closed in a single satellite coverage area, adjacent beam numbers which do not pass through in the relative movement direction are filled at the beam switching time of the single satellite coverage area, the optimal channel quality for deceiving a satellite/gateway station side is set in a pseudo measurement report of the channel quality, the satellite terminal is judged to be switched to the adjacent beam, and the pilot frequency measurement is closed on the premise of not changing a measurement switching mechanism; and if the satellite terminal is not switched to the next satellite when the satellite terminal arrives at the moment of leaving the inter-satellite overlapping range, directly filling a pseudo-measurement report for reporting the next satellite beam.
2. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: if the current TIME is t0, the TIME length of the satellite terminal reaching the position a point entering the overlapping area along the relative movement direction is DATA _ TIME _ a, and the TIME length of the satellite terminal reaching the position B point leaving the overlapping area is DATA _ TIME _ B, the TIME of entering the overlapping area is t0+ DATA _ TIME _ a, and the TIME of leaving the overlapping area is OUT _ TIME t0+ DATA _ TIME _ B.
3. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: the ephemeris application unit directly calculates the TIME of switching the current BEAM to the adjacent BEAM which is not passed through IN the relative motion direction, if the current TIME is t0, the upcoming TIME HANDOVER _ TIME of the last cross-BEAM switching is t0+0.5 × (BEAM _ OUT _ TIME + NEXT _ BEAM _ IN _ TIME), wherein BEAM _ OUT _ TIME is the calculated TIME of leaving the current BEAM coverage, and NEXT _ BEAM _ IN _ TIME is the calculated TIME of entering the adjacent BEAM coverage, and the TIME is sent to the baseband processing unit for inter-frequency measurement.
4. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: the baseband processing unit judges whether the current TIME is in the inter-satellite overlapping TIME range according to the received calculation result message of the ephemeris application unit, if so, the cross-satellite pilot frequency measurement triggering threshold and the reference signal received power RSRP measurement reporting condition are adjusted according to the received measurement configuration information and the current wave beam signal strength fluctuation condition in the channel quality statistical TIME DATA _ TIME _ CON, the cross-satellite pilot frequency measurement threshold s _ Noninistreach is reduced, the measurement report reporting condition is set as that the current cell quality is lower than the pilot frequency measurement threshold for a duration longer than the continuous monitoring TIME DATA _ TIME _ TH reporting measurement report, whether the satellite terminal pilot frequency measurement is started or not is judged, if so, whether the current wave beam signal strength triggers the cross-satellite measurement or not is judged, if not, the pilot frequency measurement function is started, and then whether the current wave beam signal strength triggers the cross-satellite measurement threshold or not is judged, if the inter-satellite beam switching time is reached, triggering adjacent satellite pilot frequency measurement, if the inter-satellite beam switching time is not reached, judging whether the inter-satellite beam switching time is reached currently, if so, filling and reporting a pseudo measurement report, otherwise, restarting to judge whether the satellite terminal pilot frequency measurement is started, if so, closing the pilot frequency measurement function, judging whether the inter-satellite beam switching time is reached currently, if so, filling and reporting the pseudo measurement report, and ending the program.
5. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 4, wherein: the contents filled in the pseudo-measurement report are adjacent beam numbers and channel quality thereof, and are used for deceiving the satellite/gateway station side and judging that the satellite terminal is switched to the adjacent beam, so that the aim of closing the pilot frequency measurement function under the premise of not changing a measurement switching mechanism is fulfilled, and if the satellite terminal is not switched to the next satellite when the satellite terminal reaches the moment of leaving the inter-satellite overlapping range, the pseudo-measurement report for reporting the next satellite beam is directly filled.
6. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 4, wherein: the reducing of the cross-satellite pilot frequency measurement threshold s _ noise is realized by the following formula:
the signal processing method includes the steps of (s _ noise-parameter- α ×) (s _ noise-min _ threshold), wherein min _ threshold is a minimum demodulation threshold of a satellite terminal, and α ranges from 0 to 1.
7. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: the interface message for transmitting the calculation result includes: the method comprises four fields of a message type, a subclass identifier, a time number and a calculation time, wherein the message type field is represented by 8 bits, and a value 00001111 represents that an interface message is calculation information for assisting pilot frequency measurement; the subclass identification field is represented by 2 bits, the value 00 represents the inter-satellite overlapping area time class, the value 01 represents the intra-satellite beam switching time class, and the value 11 represents the mixing time class; the time number field represents the number of partially filled time at the resolving time by 6 bits, if the subclass identifier takes the value 00, the value of the time number field is converted into a decimal number which is an even number, if the subclass identifier takes the value 11, the first 2 bits of the time number field represent the resolving time number in the time range of the inter-satellite overlapping zone, and the last 4 bits of the time number field represent the resolving time number at the switching time of the intra-satellite wave beam; the resolving time field is represented by "time number 27" bits, wherein each time is represented by 27 bits for time minute second milliseconds, from front to back, 5 bits for 0 to 23 hours, 6 bits for 0 to 59 minutes, 6 bits for 0 to 59 seconds, and 10 bits for 0 to 999 milliseconds.
8. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 7, wherein: when a calculation result is packaged according to an interface message format, if the subclass identifier is set to 00, filling the entering TIME IN _ TIME of the first inter-satellite overlapping region, the leaving TIME OUT _ TIME of the first inter-satellite overlapping region, the entering TIME IN _ TIME of the second inter-satellite overlapping region and the leaving TIME OUT _ TIME of the second inter-satellite overlapping region IN sequence according to the smoothness until calculation results of 0.5 x (the number of moments) of overlapping regions of the satellite terminal are filled; if the subclass identifier is 01, filling the first cross-beam switching TIME HANDOVER _ TIME and the second cross-beam switching TIME HANDOVER _ TIME in sequence according to the smoothness until the calculation result is filled; if the subclass mark is 11, filling the inter-satellite overlapping time range for resolving the time, and filling the intra-satellite beam switching for resolving the time.
9. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: the height of a low-orbit satellite for providing service for a satellite terminal is 1200km, the satellite beam coverage is formed by arranging 8 beams in a line, the 3dB beam width of each beam is 8 degrees in the moving direction, and the ground coverage field angle of the satellite is +/-25 degrees; the satellite terminal moves at the speed of 60 km/h; the satellite terminal obtains the current accurate position through a self-contained navigation module and converts the current accurate position to obtain (E102.910 degrees, N30.333 degrees and H500m degrees), and the ephemeris application unit converts the current position of the satellite S1 (E102.910 degrees, N31.901 degrees, H1200000m) and the current position of the satellite S2 (E102.910 degrees, N38.088 degrees and H1200000m) according to the latest ephemeris data.
10. The ephemeris assisted flexible switch multi-satellite coverage area inter-frequency measurement handover apparatus of claim 1, wherein: after receiving the resolving result message, the baseband processing module analyzes the resolving result to obtain a resolving result, performs pilot frequency measurement switch control according to newly acquired information, when 1 hour reaches 23 minutes, 21 seconds and 598 milliseconds, judges that the current TIME t0 is 1 hour, 23 minutes, 21 seconds and 598 milliseconds are equal to the first inter-beam switching TIME HANDOVER1_ TIME, fills and reports a pseudo-measurement report, wherein the pseudo-measurement report comprises an adjacent beam number S1_ b4 and a channel quality maximum value 30, and after receiving the pseudo-measurement report, the satellite/gateway station initiates a switching process to the adjacent beam and switches to the adjacent beam S1_ b 4; when 1 hour 23 minutes 42 seconds 287 milliseconds are reached, judging that the current TIME t0 is equal to 1 hour 23 minutes 42 seconds 287 milliseconds and the second inter-beam switching TIME HANDOVER2_ TIME, filling and reporting a pseudo-measurement report, wherein the content of the pseudo-measurement report is an adjacent beam number S1_ b5 and a channel quality maximum value 30, and after receiving the pseudo-measurement report, the satellite/gateway station initiates a process of switching to the adjacent beam and switches to the adjacent beam S1_ b 5; when the TIME reaches 1 hour 24 minutes 2 seconds 976 milliseconds, judging that the TIME t0 is equal to 1 hour 24 minutes 2 seconds 976 milliseconds and the switching TIME HANDOVER3_ TIME between third-TIME beams is equal, filling and reporting a pseudo-measurement report, wherein the contents of the pseudo-measurement report are an adjacent beam number S1_ b6 and a channel quality maximum value 30, after receiving the pseudo-measurement report, a satellite/gateway station initiates a switching process to the adjacent beam, and the satellite terminal is switched to the adjacent beam S1_ b 6; when reaching 24 minutes and 13 seconds 493 milliseconds at 1 hour, judging that the current TIME t0 is 1 minute and 24 minutes and 13 seconds 493 milliseconds within the TIME range of 1 minute and 24 minutes and 13 seconds 493 milliseconds to 1 hour and 25 minutes and 14 seconds 70 milliseconds, configuring default DATA _ TIME _ CON (DATA _ TIME _ CON) as the signal intensity fluctuation condition of a satellite terminal communication link according to the front baseband parameters, determining a value of alpha, adjusting a cross-satellite pilot frequency measurement threshold s _ NoninTranssearch ═ s _ Noninsearch-alpha x (S _ Noninsearch-min _ Demthreshold), setting a measurement report reporting condition to be that the current cell quality is lower than s _ Noninsearch duration and is greater than 2 seconds measurement report, judging that the cross frequency measurement report is not started, opening a cross frequency measurement switch, judging whether the cross-trigger satellite measurement threshold is triggered, judging that the signal strength does not reach 129 minutes at the inter-satellite beam switching TIME 1 hour and 24 minutes before reaching 24 seconds, and monitoring the current beam strength at 24 minutes before reaching 129 milliseconds at 1 hour, executing a neighbor pilot frequency measurement process once a threshold is triggered; if the satellite terminal is switched to the adjacent satellite, the ephemeris processing unit calculates the moment of switching the adjacent beam which is not passed by the current beam of the satellite terminal in the relative motion direction aiming at the adjacent satellite, and repeats the process; when 1 hour is reached at 25 minutes, 14 seconds and 70 milliseconds, if the satellite terminal is still served by the satellite S1, the pseudo measurement report reporting the satellite S2 beam S2_ b3 is directly filled.
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