CN111049537A - Satellite communication terminal antenna impedance matching method and device - Google Patents
Satellite communication terminal antenna impedance matching method and device Download PDFInfo
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- CN111049537A CN111049537A CN201911364510.6A CN201911364510A CN111049537A CN 111049537 A CN111049537 A CN 111049537A CN 201911364510 A CN201911364510 A CN 201911364510A CN 111049537 A CN111049537 A CN 111049537A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Abstract
The invention discloses a satellite communication terminal antenna impedance matching method and a device, wherein the method comprises the following steps: tuning the antenna receiving matching impedance to obtain an optimal value of the receiving matching impedance; tuning the antenna transmission matching impedance to obtain an optimal value of the transmission matching impedance; respectively writing the optimal values of the antenna receiving and transmitting matching impedance into antenna parameters; in a Time Division Duplex (TDD) working mode, when the receiving time slot is in, calling an optimal value of receiving matching impedance; and when the receiving time slot is in, calling the optimal value of the transmitting matching impedance. By independently optimizing the receiving efficiency and the transmitting efficiency of the satellite communication terminal antenna, the optimal matching values of the receiving impedance and the transmitting impedance are respectively set, and the transmitting power of the satellite communication terminal antenna transmitter and the receiver omnidirectional sensitivity are obviously improved.
Description
Technical Field
The invention belongs to the field of wireless communication networks, and particularly relates to a satellite communication terminal antenna impedance matching method and device.
Background
With the rapid development of satellite communication technology, satellite communication functions such as supporting satellite telephones and satellite data transmission are continuously moving from military use to civil use. The satellite communication terminal becomes a novel communication technology except for cellular communication, plays a unique role in a blind area of cellular communication, such as a mountain area, a sea area and other areas without cellular base stations, and has great practicability. Satellite communication terminals, particularly handheld terminals, have these stringent requirements for battery capacity and power efficiency. The satellite communication terminal antenna receives and transmits work in different frequency bands, the work mode is time division duplex TDD, the receiving and transmitting multiplexing antenna adopts a group of same antenna matching values, the receiving and transmitting frequency bands cannot be guaranteed, and the efficiency of the antenna can be maximized at the same time. How to provide the efficiency of the transceiver circuit and the antenna becomes a key technology for saving power consumption and prolonging the power supply time of the battery.
Disclosure of Invention
Aiming at the problems in the prior art, the optimal matching values of the receiving impedance and the transmitting impedance are respectively set by independently optimizing the receiving efficiency and the transmitting efficiency of the satellite communication terminal antenna.
In order to achieve the above object, in one aspect, the present invention provides an impedance matching method for an antenna of a satellite communication terminal, including the steps of:
step S1, tuning the antenna receiving matching impedance to obtain the optimal value of the receiving matching impedance;
step S2, tuning the antenna transmission matching impedance to obtain the optimal value of the transmission matching impedance;
step S3, respectively writing the optimal values of the antenna receiving and transmitting matching impedance into antenna parameters;
and step S4, calling the corresponding optimal matching impedance value according to the time division duplex time slot.
Preferably, in step S1, the capacitive combination with the largest occurrence number is obtained by performing receiving sampling on a plurality of antenna impedance matching devices, and is used as the optimal solution of receiving matching impedance, where the working process of each device receiving sampling calculation is as follows:
step S11, presetting an expected value of the antenna receiving performance index;
step S12, the antenna receives the fixed level power;
step S13, traversing all state combinations of the adjustable capacitor and the adjustable inductor, and storing each capacitance-inductance combination;
step S14, searching a plurality of corresponding capacitive combinations with the antenna receiving performance indexes being closest to the preset performance index expected values, and recording storage addresses of the capacitive combinations;
step S15, adjusting the impedance to the searched capacitance and inductance combination in turn;
step S16, measuring the performance index of the receiving antenna corresponding to each capacitive-inductive combination;
and step S17, calculating the minimum value of the performance index of the receiving antenna and the corresponding capacitive combination thereof.
Preferably, in step S2, the capacitance-inductance combination with the largest occurrence number is obtained by performing transmission sampling on a plurality of antenna impedance matching devices, and is used as the optimal solution of the transmission matching impedance, where the working process of each device transmission sampling calculation is as follows:
step S21, presetting an expected value of the antenna transmission performance index;
step S22, the antenna transmits power with fixed level;
step S23, traversing all state combinations of the adjustable capacitor and the adjustable inductor, and storing each capacitance-inductance combination;
s24, searching a plurality of corresponding capacitive combinations with the antenna emission performance indexes being closest to the preset performance index expected values, and recording storage addresses of the capacitive combinations;
step S25, tuning the impedance to the selected capacitance combination in sequence;
step S26, measuring the performance index of the transmitting antenna corresponding to each capacitive-inductive combination;
and step S27, calculating the maximum value of the performance index of the transmitting antenna and the corresponding capacitive combination thereof.
Preferably, the receiving performance index is a total isotropic sensitivity TIS value, and the transmitting performance index is a total transmission power TRP value.
Preferably, in the step S4, in the receiving time slot, the optimal value of the receiving matching impedance is called; and calling the optimal value of the transmission matching impedance in the transmission time slot.
On the other hand, the invention provides an impedance matching device of a satellite communication terminal antenna, which comprises an antenna, an impedance tuner, an antenna switch, a receiver and a transmitter, wherein the impedance tuner comprises a programmable capacitor array and a programmable inductor array, and is characterized by further comprising a baseband processing unit, an impedance control bus, a parameter storage unit and a performance measurement unit, wherein,
the baseband processing unit is used for calling the capacitance-inductance combination of the parameter storage unit and controlling the impedance tuner through the impedance control bus to realize impedance tuning;
the parameter storage unit is used for storing a plurality of capacitance combinations which are arranged from small to large with the difference of the preset optimal impedance matching value;
and the impedance control bus is used for transmitting data, addresses and control instructions of the baseband processing unit, and the implementation mode of the impedance control bus comprises a serial peripheral equipment interface bus (SPI) and a mobile industrial processor interface bus (MIPI).
The performance measuring unit is used for measuring performance indexes of the antenna in receiving and transmitting states, acquiring a Total Isotropic Sensitivity (TIS) value of the receiving antenna in an antenna receiving time slot, and acquiring a TIS minimum value and a corresponding capacitance combination thereof; and in the transmitting time slot, acquiring a total transmitting power TRP value of a transmitting antenna, and acquiring a maximum TRP value and a corresponding capacitance-inductance combination thereof.
Preferably, the parameter storage unit includes at least one of a physical address or a logical address.
Preferably, the working process of the baseband processing unit includes:
presetting an expected value of an antenna receiving and transmitting performance index;
sending a control instruction to the impedance tuner to traverse all state combinations of the adjustable capacitor and the adjustable inductor, wherein each impedance combination is used as a capacitance-inductance combination and is written into the parameter storage unit;
comparing the performance indexes corresponding to the capacitance combination in the parameter storage unit with the performance index expected value sum in sequence, selecting a plurality of capacitance combinations according to the difference value from small to large, and recording the storage addresses of the capacitance combinations in the parameter storage unit;
the impedance tuner impedances are tuned to the selected capacitive-inductive combinations, respectively, via the impedance control bus.
Preferably, when the performance measuring unit obtains the antenna receiving and transmitting performance indexes, the antenna impedance matching device to be measured is located in the antenna darkroom.
Preferably, the impedance matcher calls a receiving matching impedance optimal value at a receiving time slot; and calling the optimal value of the transmission matching impedance in the transmission time slot.
In yet another aspect, the present invention provides an electronic device comprising a central processing unit and a memory storing computer-executable instructions, wherein the computer-executable instructions, when executed, cause the processor to perform the above method.
In a fourth aspect, the present invention provides a non-volatile storage medium having stored therein a computer program which, when executed, implements the above method.
Compared with the prior art, the invention has the following technical effects:
according to the satellite communication terminal antenna impedance matching method and device, under the TDD working mode, the optimal matching impedance values of receiving and transmitting are independently set, different antenna matching impedance parameters are called at different time slots, the maximization of the antenna efficiency can be realized, the power consumption of a transmitter is further reduced, and the receiver sensitivity index of a system is improved.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 is a diagram illustrating a structure of an impedance matching apparatus for an antenna of a satellite communication terminal according to an embodiment of the present invention;
fig. 2 shows a flow chart of a method for impedance matching of a satellite communication terminal antenna according to an embodiment of the invention;
FIG. 3 shows a flow chart for tuning the antenna receive matching impedance and obtaining an optimal value of the receive matching impedance according to the embodiment of FIG. 1;
fig. 4 shows a flow chart for tuning the antenna transmission matching impedance and obtaining the optimal value of the transmission matching impedance according to the embodiment of fig. 1.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In order to make the objects, technical solutions, design methods, and advantages of the present invention more apparent, the present invention will be further described in detail by specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The invention is further described with reference to the following figures and detailed description.
Examples
Description of the parameters in the examples:
Zi＝(Ci，Li) (i ═ 1, 2, …, M): traversing the capacitance-inductance combination obtained by the impedance tuner 102;
Sr: total isotropic sensitivity TIS expected value S of antenna in receiving frequency bandr；
So: total transmission power TRP expected value S of antenna in transmission frequency bando；
Zn＝(Cn，Ln) (N ═ 1, 2, …, N): at Zi＝(Ci，Li) And S found in (i ═ 1, 2, …, M)rOr SoN capacitance combinations with the closest standing-wave ratios, wherein N is less than M;
S1，S2，…，Sn(n＝1，2，…，N): tuning the impedance of the impedance tuner 102 to Z, respectively1，Z2，…，ZnThen, correspondingly obtaining the total isotropic sensitivity TIS value of the receiving antenna;
Smin＝min{S1，S2，…，Sn}: the minimum value of the total isotropic sensitivity TIS value of the receiving antenna;
Addrs-min: s aboveminCorresponding capacitance combination ZnA storage address in the parameter storage unit 108;
Znsmin: after K times of sampling, K Addr are obtaineds-minMemory address Addr appearing most frequentlys-minThe corresponding capacitance and inductance combination.
P1，P2，…，Pn(N ═ 1, 2, …, N): tuning the impedance of the impedance tuner 102 to Z, respectively1，Z2，…，ZnThen, correspondingly obtaining the total transmission power TRP value of the transmitting antenna;
Pmax＝max{P1，P2，…，Pn}: the maximum value of the total transmission power TRP value of the transmitting antenna;
Addrp-max: p is abovemaxCorresponding capacitance combination ZnA storage address in the parameter storage unit 108;
Znpmax: after K times of sampling, K Addr are obtainedp-maxAddr with the largest occurrences-minThe corresponding capacitance and inductance combination.
Fig. 1 shows a structure of an antenna impedance matching apparatus for a satellite communication terminal according to an embodiment of the present invention, which includes a passive antenna 101, an impedance tuner 102, an antenna switch 103, a transmitter 104, a receiver 105, a baseband processing unit 106, a control bus 107, a parameter storage unit 108, and a performance measurement unit 109. In the system, the impedance tuner 102 includes a programmable capacitor array and a programmable inductor array, and the baseband processing unit 106 can change the impedance of the impedance tuner 102 through a control bus 107, such as SPI, MIPI, and other control buses, and can be tuned within a certain standing-wave ratio circle on a smith chart.
Fig. 2 is a flowchart of an antenna impedance matching method for a satellite communication terminal according to an embodiment of the present invention, which includes an antenna transmit-receive matching impedance tuning optimization stage and an antenna practical application stage. Wherein, the antenna receiving and transmitting matching impedance tuning optimization stage comprises:
s1, tuning and optimizing the receiving impedance matching value to obtain the optimal value of the receiving matching impedance;
s2, tuning and optimizing the transmission impedance matching value to obtain the optimal value of the receiving matching impedance;
and S3, writing the optimal values of the antenna receiving/transmitting matching impedance into antenna parameters respectively.
The practical application stage of the antenna comprises the following steps:
s4, when the receiving time slot is in, calling the optimal value of the receiving matching impedance; and when the receiving time slot is in, calling the optimal value of the transmitting matching impedance.
Fig. 3 shows a flow chart for tuning the antenna receive matching impedance and obtaining the optimal value of the receive matching impedance according to the embodiment of fig. 1. In the process, the capacitance-inductance combination with the most occurrence times is calculated by carrying out receiving sampling on a plurality of antenna impedance matching devices and is used as the optimal solution of the receiving matching impedance. The working process of receiving, sampling and calculating by each antenna impedance matching device can be divided into three stages of receiving impedance tuning characterization, receiving performance optimal value search and receiving performance measurement verification, and specifically comprises the following steps:
a receive impedance tuning characterization phase comprising:
step S11, presetting antenna performance index expectation value S in receiving frequency bandrIn this embodiment, the total isotropic sensitivity TIS is selected as the performance index of the receiving frequency band;
step S12, the antenna 101 is removed, the impedance tuner 102 and the antenna switch 103 are disconnected, a 50ohm to ground matching load is connected to the right end of the impedance tuner 102, and a vector network analyzer with a port calibrated is connected to the left end of the impedance tuner 102;
step S13, the baseband processing unit 106 controls the impedance tuner 102 via the impedance control bus 107 to traverse the tunable capacitor and the tunable inductorAll state combinations of (C)i，Li) Each group of capacitance combination is Zi. Combining the capacitance and inductance Z obtained by traversing the impedance tuner 102i＝(Ci，Li) (i ═ 1, 2, …, M) is written to parameter storage unit 108.
The receiving performance index scanning and searching stage comprises the following steps:
step S14, according to the total omnidirectional sensitivity TIS expectation value S of the preset antenna in the receiving frequency bandrSearch and S in the parameter storage unit 108rThe capacitance-sense combinations Z are recordedn(N-1, 2, …, N) and its storage address in parameter storage unit 108.
The receiving performance index measurement verification stage comprises the following steps:
step S15, mounting the antenna 101 in place, placing the whole device in an antenna darkroom environment, taking out the capacitance combination from the parameter storage unit 108 by the baseband processing unit 106, and adjusting the impedance of the impedance tuner 102 to the capacitance combination Z stored in the storage unit 108 through the impedance control bus 1071，Z2，…，Zn(n＝1，2，…，N)；
Step S16, then the total isotropic sensitivity TIS values of the receiving antenna 101 are measured by the performance measuring unit 109, respectively S1，S2，…，Sn(n＝1，2，…，N)；
Step S17, obtaining the minimum value S of the total isotropic sensitivity TISmin＝min{S1，S2，…，SnAnd SminCorresponding parameter memory cell 108 address Addrs-min。
The above-described sampling calculation process is repeated for K devices, and the performance measurement unit 109 obtains K sets SminAnd corresponding Addrs-min。Synthesizing K sample capacitance combinations, the storage address Addr in the parameter storage unit 108s-minZ corresponding to the maximum occurrencenI.e. the optimum value Z of the receive matching impedancensmin。
Fig. 4 shows a flow chart for tuning the antenna transmission matching impedance and obtaining the optimal value of the transmission matching impedance according to the embodiment of fig. 1. The process is that a plurality of antenna impedance matching devices are subjected to emission sampling, the capacitance-inductance combination with the largest occurrence frequency is obtained through calculation, and the capacitance-inductance combination is used as the optimal solution of the emission matching impedance. The working process of the transmission sampling calculation of each antenna impedance matching device can be divided into three stages of transmission impedance tuning characterization, transmission performance optimal value search and transmission performance measurement, and specifically comprises the following steps:
a transmit impedance tuning characterization phase comprising:
step S21, presetting the expected value S of the performance index of the antenna in the transmitting frequency bandoIn this embodiment, the performance index of the transmission frequency band selects the total transmission power TRP;
step S22, the antenna 101 is detached, 50 ohms is added to the ground matching load at the antenna 101, the ports of the impedance tuner 102 and the antenna switch 103 are disconnected, and a vector network analyzer with a calibrated port is connected to the right end of the impedance tuner 102;
step S23, the baseband processing unit 106 controls the impedance tuner 102 via the impedance control bus 107 to traverse all state combinations (C) of the tunable capacitor and the tunable inductori，Li) Each group of impedance combination measures an input impedance Z corresponding to a capacitive-inductive combinationi. Combining the capacitance and inductance Z obtained by traversing the impedance tuner 102i＝(Ci，Li) (i ═ 1, 2, …, M) is written to parameter storage unit 108.
The transmission performance index scanning search stage comprises the following steps:
step S24, according to the total transmission power TRP expectation value S of the antenna in the transmission frequency band set in advanceoSearch and S in the parameter storage unit 108oThe capacitance-sense combinations Z are recordedn(N-1, 2, …, N) and its storage address in parameter storage unit 108.
The transmission performance index measurement verification stage comprises the following steps:
step S25, the antenna 101 is installed in place, the whole device is placed in an antenna darkroom environment, and the baseband processing unit 106 takes out the capacitance combination from the parameter storage unit 108;
step S26, tuning the impedance of the impedance tuner 102 to Z through the impedance control bus 107, respectively1，Z2，…，Zn(N-1, 2, …, N) and then the total transmit power TRP value of the transmit antenna, P respectively, is measured by the performance measurement unit 1091，P2，…，Pn(n＝1，2，…，N)；
Step S27, obtaining the maximum value P of the total emission power TRP valuemax＝max{P1，P2，…，Pn}, and PmaxThe corresponding storage address Addr in the parameter storage unit 108p-max。
The above-described sampling calculation process is repeated for K devices, and the performance measurement unit 109 obtains K groups of PmaxAnd corresponding Addrp-max. Synthesizing K sample capacitance combinations, the storage address Addr in the parameter storage unit 108p-maxZ corresponding to the maximum occurrencenI.e. the optimum value Z of the transmission matching impedancenpmax。
And respectively writing the optimal value of the receiving matching impedance and the optimal value of the transmitting matching impedance into a ROM of the antenna impedance matcher 102, namely finishing the tuning optimization of the antenna receiving and transmitting matching impedance.
In the time division duplex TDD working mode, when in the receiving time slot, the impedance tuner calls the optimal value Z of the receiving matching impedancensmin(ii) a When in the transmitting time slot, the impedance tuner calls the optimal value Z of the transmitting matching impedancenpmax。
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A satellite communication terminal antenna impedance matching method is characterized by comprising the following steps:
step S1, tuning the antenna receiving matching impedance to obtain the optimal value of the receiving matching impedance;
step S2, tuning the antenna transmission matching impedance to obtain the optimal value of the transmission matching impedance;
step S3, respectively writing the optimal values of the antenna receiving and transmitting matching impedance into antenna parameters;
and step S4, calling the corresponding optimal matching impedance value according to the time division duplex time slot.
2. The method as claimed in claim 1, wherein the step S1 is implemented by performing receiving sampling on a plurality of antenna impedance matching devices, calculating the capacitive combination with the largest occurrence number as the optimal solution of the receiving matching impedance, and the working process of calculating the receiving sampling of each device is as follows:
step S11, presetting an expected value of the antenna receiving performance index;
step S12, the antenna receives the fixed level power;
step S13, traversing all state combinations of the adjustable capacitor and the adjustable inductor, and storing each capacitance-inductance combination;
step S14, searching a plurality of corresponding capacitive combinations with the antenna receiving performance indexes being closest to the preset performance index expected values, and recording storage addresses of the capacitive combinations;
step S15, adjusting the impedance to the searched capacitance and inductance combination in turn;
step S16, measuring the performance index of the receiving antenna corresponding to each capacitive-inductive combination;
and step S17, calculating the minimum value of the performance index of the receiving antenna and the corresponding capacitive combination thereof.
3. The method as claimed in claim 1, wherein the step S2 is implemented by performing transmission sampling on a plurality of antenna impedance matching devices, calculating the capacitive combination with the largest occurrence number as the optimal solution of the transmission matching impedance, and the operation process of calculating the transmission sampling of each device is as follows:
step S21, presetting an expected value of the antenna transmission performance index;
step S22, the antenna transmits power with fixed level;
step S23, traversing all state combinations of the adjustable capacitor and the adjustable inductor, and storing each capacitance-inductance combination;
s24, searching a plurality of corresponding capacitive combinations with the antenna emission performance indexes being closest to the preset performance index expected values, and recording storage addresses of the capacitive combinations;
step S25, tuning the impedance to the selected capacitance combination in sequence;
step S26, measuring the performance index of the transmitting antenna corresponding to each capacitive-inductive combination;
and step S27, calculating the maximum value of the performance index of the transmitting antenna and the corresponding capacitive combination thereof.
4. The impedance matching method for a satellite communication terminal antenna according to any of claims 2-3, wherein the reception performance index is a Total Isotropic Sensitivity (TIS) value, and the transmission performance index is a total transmission power (TRP) value.
5. The impedance matching method for the antenna of the satellite communication terminal according to claim 1, wherein in the step S4, in the receiving time slot, the optimal value of the receiving matching impedance is called; and calling the optimal value of the transmission matching impedance in the transmission time slot.
6. An impedance matching device of a satellite communication terminal antenna comprises an antenna, an impedance tuner, an antenna switch, a receiver and a transmitter, wherein the impedance tuner comprises a programmable capacitor array and a programmable inductor array, and is characterized by further comprising a baseband processing unit, an impedance control bus, a parameter storage unit and a performance measuring unit,
the baseband processing unit is used for calling the capacitance-inductance combination of the parameter storage unit and controlling the impedance tuner through the impedance control bus to realize impedance tuning;
the parameter storage unit is used for storing a plurality of capacitance combinations which are arranged from small to large with the difference of the preset optimal impedance matching value;
and the impedance control bus is used for transmitting data, addresses and control instructions of the baseband processing unit, and the implementation mode of the impedance control bus comprises a serial peripheral equipment interface bus (SPI) and a mobile industrial processor interface bus (MIPI).
The performance measuring unit is used for measuring performance indexes of the antenna in receiving and transmitting states, acquiring a Total Isotropic Sensitivity (TIS) value of the receiving antenna in an antenna receiving time slot, and acquiring a TIS minimum value and a corresponding capacitance combination thereof; and in the transmitting time slot, acquiring a total transmitting power TRP value of a transmitting antenna, and acquiring a maximum TRP value and a corresponding capacitance-inductance combination thereof.
7. The impedance matching device for an antenna of a satellite communication terminal according to claim 6, wherein the parameter storage unit includes at least one of a physical address or a logical address.
8. The impedance matching device for an antenna of a satellite communication terminal according to claim 6, wherein the operation procedure of the baseband processing unit includes:
presetting an expected value of an antenna receiving and transmitting performance index;
sending a control instruction to the impedance tuner to traverse all state combinations of the adjustable capacitor and the adjustable inductor, wherein each impedance combination is used as a capacitance-inductance combination and is written into the parameter storage unit;
comparing the performance indexes corresponding to the capacitance combination in the parameter storage unit with the performance index expected value sum in sequence, selecting a plurality of capacitance combinations according to the difference value from small to large, and recording the storage addresses of the capacitance combinations in the parameter storage unit;
the impedance tuner impedances are tuned to the selected capacitive-inductive combinations, respectively, via the impedance control bus.
9. The impedance matching device for a satellite communication terminal antenna according to claim 6, wherein when the performance measurement unit obtains the antenna reception and transmission performance indexes, the impedance matching device for an antenna to be measured is located in an antenna darkroom.
10. The impedance matching device for the antenna of the satellite communication terminal as claimed in claim 6, wherein the impedance matcher calls a receiving matching impedance optimal value at a receiving time slot; and calling the optimal value of the transmission matching impedance in the transmission time slot.
11. An electronic device comprising a central processor and a memory storing computer-executable instructions, wherein the computer-executable instructions, when executed, cause the processor to perform the method of any one of claims 1-5.
12. A non-volatile storage medium having stored therein a computer program which, when executed, implements the method of any one of claims 1-5.
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