Radio frequency signal transceiving device and method thereof, self-optimizing optical transmission device and method thereof

Abstract

A radio frequency signal transceiving method and device thereof are proposed. The method is configured for a radio equipment controller (REC) of a radio frequency signal transceiving device to exchange radio signals between a plurality of Baseband Units (BBUs) and a plurality of Radio Equipments (REs) that respectively connected to a plurality of Remote Radio Units (RRUs), and the method includes but not limited to the step of: receiving a first radio downlink signal at least, generating a first downlink control signal, modulating the first radio downlink signal at least into a first analog downlink signal at a first frequency according to the first downlink control signal, multiplexing the first analog downlink signal and the first downlink control signal into an integrated analog downlink signal, converting the integrated analog downlink signal into an optical downlink signal, and transmitting the optical downlink signal.

What is claimed is:  
     
       1. A radio frequency signal transceiving method, configured for a radio equipment controller (REC) of a radio frequency signal transceiving device to exchange radio signals between a plurality of Baseband Units (BBUs) and a plurality of Radio Equipments (REs) that respectively connected to a plurality of Remote Radio Units (RRUs), the method comprising:
 receiving a first radio downlink signal at least; 
 generating a first downlink control signal comprising control information of the first radio downlink signal; 
 modulating the first radio downlink signal at least into a first analog downlink signal at a first frequency according to the first downlink control signal; 
 multiplexing the first analog downlink signal and the first downlink control signal into an integrated analog downlink signal; 
 converting the integrated analog downlink signal into a first optical downlink signal; and 
 transmitting the first optical downlink signal. 
 
     
     
       2. The radio frequency signal transceiving method according to  claim 1 , wherein before the step of multiplexing the first analog downlink signal and the first control signal into the integrated analog downlink signal, the radio frequency signal transceiving method further comprising:
 receiving a second radio downlink signal; 
 generating a second downlink control signal; 
 modulating the second downlink signal into a second analog downlink signal at a second frequency according to the second downlink control signal; and 
 the step of multiplexing the first analog downlink signal and the first control signal into the integrated analog downlink signal, further comprising:
 multiplexing the first analog downlink signal, the first downlink control signal, the second analog downlink signal and the second downlink control signal into the integrated analog downlink signal. 
 
 
     
     
       3. The radio frequency signal transceiving method according to  claim 1 , wherein the method further comprising:
 receiving an optical uplink signal; 
 converting the optical uplink signal into an integrated analog uplink signal; 
 de-multiplexing the integrated analog uplink signal into a first uplink control signal, a second uplink control signal, a first analog uplink signal at the first frequency and a second analog uplink signal at the second frequency; 
 respectively demodulating the first analog uplink signal and the second analog uplink signal into a first radio uplink signal and a second radio uplink signal; 
 respectively analyzing the first uplink control signal and the second uplink control signal; and 
 transmitting the first radio uplink signal and the second radio uplink signal. 
 
     
     
       4. A radio frequency signal transceiving method, configured for a first Radio Equipments (RE) of a radio frequency signal transceiving device to exchange radio frequency signals between a Baseband Units (BBU) and a Remote Radio Units (RRU) by a radio equipment controller (REC), wherein the REC is connected to the BBU and the RE is connected to the RRU, the method comprising:
 receiving a first optical downlink signal from the REC; 
 converting the first optical downlink signal into a first integrated analog downlink signal; 
 deriving a first downlink control signal from the first integrated analog downlink signal, and deriving an first analog downlink signal from the first integrated analog downlink signal according to the first downlink control signal, wherein the first downlink control signal comprises control information of the first integrated analog downlink signal and the first analog downlink signal is at a first frequency in the first integrated analog downlink signal; 
 demodulating the first analog downlink signal into a first radio downlink signal; and 
 transmitting the first radio downlink signal. 
 
     
     
       5. The radio frequency signal transceiving method according to  claim 4 , wherein the method further comprising:
 receiving a first radio uplink signal; 
 modulating the first radio uplink signal into a first analog uplink signal at the first frequency; 
 generating a first uplink control signal responding to the first downlink control signal; 
 multiplexing the first analog uplink signal and the first uplink control signal, into a first integrated analog uplink signal; 
 converting the first integrated analog uplink signal into a first optical uplink signal; and 
 transmitting the first optical uplink signal to the REC. 
 
     
     
       6. The radio frequency signal transceiving method according to  claim 5 , wherein the first downlink control signal and the first uplink control signal comprising the information of the first frequency, and the method further comprising
 controlling and monitoring the RRU according to the first downlink control signal and the first uplink control signal; 
 adjusting a link gain for the first radio downlink signal and the first uplink signal to be equal; 
 estimating a single trip delay from the REC to the RE according to the first downlink control signal and the first uplink control signal; and 
 changing a link performance by exchanging the first downlink control signal, the first uplink control signal between the REC with the first RE. 
 
     
     
       7. The radio frequency signal transceiving method according to  claim 4 , wherein after the step of deriving the first downlink control signal and the first analog downlink signal, the method further comprising:
 deriving a second integrated analog downlink signal from the first integrated analog downlink signal; 
 converting the second integrated analog downlink signal into a second optical downlink signal; and 
 transmitting the second optical downlink signal to a second RE of the radio frequency signal transceiving device. 
 
     
     
       8. The radio frequency signal transceiving method according to  claim 6 , wherein the method further comprising:
 receiving a second optical uplink signal from the second RE of the radio frequency signal transceiving device; 
 converting the second optical uplink signal to a second integrated analog uplink signal; 
 multiplexing the first analog uplink signal, the first uplink control signal and the second integrated analog uplink signal, into a third integrated analog uplink signal; 
 converting the third integrated analog uplink signal into a third optical uplink signal; and 
 transmitting the third optical uplink signal to the REC. 
 
     
     
       9. The radio frequency signal transceiving method according to  claim 4 , wherein the first radio downlink signal comprising either of
 a digital downlink signal, 
 an analog downlink signal at a radio frequency accordant with the frequency which the downlink signal transmitting at the RRU, or 
 an analog downlink control signal at a specified frequency. 
 
     
     
       10. The radio frequency signal transceiving method according to  claim 4 , wherein the first radio uplink signal comprising either of
 a digital uplink signal, 
 an analog uplink signal at a radio frequency accordant with the frequency which the uplink signal receiving at the RRU, or 
 an analog uplink signal at a specified frequency. 
 
     
     
       11. The radio frequency signal transceiving method according to  claim 4 , wherein the first downlink control signal and the first uplink control signal to transceiving radio signal between the REC and RE comprising
 the first downlink radio signal, 
 the first uplink radio signal, or 
 both of the first downlink radio signal and the first uplink radio signal. 
 
     
     
       12. A radio frequency signal transceiving device, comprising:
 a radio equipment controller (REC); 
 a plurality of Radio Equipments (REs), connected to the REC, wherein the REs comprising a first RE and a second RE at least, 
 wherein the REC:
 receives a first radio downlink signal at least; 
 generates a first downlink control signal comprising control information of the first radio downlink signal; 
 
 modulates the first radio downlink signal into a first analog downlink signal at a first frequency according to the first downlink control signal;
 multiplexes the first analog downlink signal and the first downlink control signal into a first integrated analog downlink signal; 
 converts the first integrated analog downlink signal into a first optical downlink signal; and 
 transmits the first optical downlink signal to the REs. 
 
 
     
     
       13. The radio frequency signal transceiving device according to  claim 12 , wherein:
 the REC:
 further receives a second radio downlink signal; 
 generates a second downlink control signal; 
 
 modulates the second radio downlink signal into a second analog downlink signal at a second frequency according to the second downlink control signal; and
 multiplexes the first analog downlink signal, the first downlink control signal a second downlink control signal according to the second analog downlink signal into the first integrated analog downlink signal. 
 
 
     
     
       14. The radio frequency signal transceiving device according to  claim 13 ,
 wherein the REC:
 receives a first optical uplink signal; 
 converts the first optical uplink signal into a first integrated analog uplink signal; 
 de-multiplexes the first integrated analog uplink signal into a first uplink control signal, a second uplink control signal, a first analog uplink signal at the first frequency and a second analog uplink signal at the second frequency; 
 respectively analyzes the first uplink control signal and the second uplink control signal; 
 respectively demodulates the first analog uplink signal and the second analog uplink signal into a first radio uplink signal and a second radio uplink signal according to the first uplink control signal and the second uplink control signal; and 
 transmits the first radio uplink signal and the second radio uplink signal. 
 
 
     
     
       15. The radio frequency signal transceiving device according to  claim 13 , wherein the REC comprising:
 a first front end circuit, receives the first radio downlink signal and the first downlink control signal, modulates the first radio downlink signal into the first analog downlink signal at the first frequency; 
 a second front end circuit, receives the second radio downlink signal and the first downlink control signal, modulates the second radio downlink signal into the second analog downlink signal at the second frequency; 
 a master control unit, coupled to the first front end circuit and the second front end circuit, assigns the frequency value of the first frequency and the second frequency, analyzes the first uplink control signal and the second uplink control signal, generates the first downlink control signal and the downlink second control signal at a control frequency at least, and transmits the first downlink control signal and the second downlink control signal; 
 a multiplexer, coupled to the first front end circuit, the second front end circuit and the master control unit, multiplexes the first analog downlink signal, the second analog downlink signal, the first downlink control signal and the second downlink control signal into the first integrated analog downlink signal; and 
 an REC electric to optical converter (E/O), coupled to the multiplexer, converts the first integrated analog downlink signal into the first optical downlink signal, and transmits the first optical downlink signal to the REs. 
 
     
     
       16. The radio frequency signal transceiving device according to  claim 12 ,
 wherein the first RE:
 receives a first optical downlink signal from the REC; 
 converts the first optical downlink signal into a first integrated analog downlink signal; 
 derives a first analog downlink signal, a first downlink control signal and a second integrated analog downlink signal from the first integrated analog downlink signal, wherein the first analog downlink signal is at the first frequency; 
 demodulates the first analog downlink signal into the first radio downlink signal; 
 transmits the first radio downlink signal; 
 converts the second integrated analog downlink signal into a second optical downlink signal; and 
 transmits the second optical downlink signal to a second RE of the REs. 
 
 
     
     
       17. The radio frequency signal transceiving device according to  claim 16 , wherein:
 the first RE comprising:
 a first optical to electric converter (O/E), coupled to the REC , receives the first optical downlink signal, and converts the first optical downlink signal into the first integrated analog downlink signal; and 
 a first radio front end circuit, coupled to the first O/E, derives the first analog downlink signal, the first downlink control signal, and the second integrated analog downlink signal from the integrated analog downlink signal, demodulates the first analog downlink signal into the first radio downlink signal, and transmits the first radio downlink signal; and 
 a first electric to optical converter (E/O), coupled to the first radio front end circuit, converts the second integrated analog downlink signal into the second optical downlink signal, transmits the second optical downlink signal to the second RE of the REs. 
 
 
     
     
       18. The radio frequency signal transceiving device according to  claim 17 , wherein:
 the second RE comprising:
 a second optical to electric converter (O/E), coupled to the first E/O of the first RE, receives the second optical downlink signal from the first RE, and converts the second optical downlink signal into the third integrated analog downlink signal; and 
 a second radio front end circuit, coupled to the second O/E, derives the second analog downlink signal and the second downlink control signal from the third integrated analog downlink signal, demodulates the second analog downlink signal into the second radio downlink signal, and transmits the second radio downlink signal. 
 
 
     
     
       19. The radio frequency signal transceiving device according to  claim 16 ,
 wherein the first RE:
 receives a first radio uplink signal; 
 modulates the first radio uplink signal into a first analog uplink signal at the first frequency; 
 generates a first uplink control signal responding to the first downlink control signal; 
 receives a second optical uplink signal from the second RE of the REs; 
 converts the second optical uplink signal to a first integrated analog uplink signal; 
 multiplexes the first analog uplink signal, the first uplink control signal, and the first integrated analog uplink signal into a second integrated analog uplink signal; 
 converts the second integrated analog uplink signal into the first optical uplink signal; and 
 transmits the first optical uplink signal to the REC. 
 
 
     
     
       20. The radio frequency signal transceiving device according to  claim 19 , wherein:
 when the first radio front end circuit receives the first radio uplink signal, the first uplink control signal, and the first integrated analog uplink signal, the first radio front end circuit modulates the first radio uplink signal into the first analog uplink signal at the first frequency, multiplexes the first analog uplink signal, the first uplink control signal, and the first integrated analog uplink signal into the second integrated analog uplink signal, and the first RE further comprising:
 a third O/E, coupled to the second E/O of the second RE, receives and converts the second optical uplink signal into the first integrated analog uplink signal; and 
 a second E/O, coupled to the first radio front end circuit and the REC, converts the second integrated analog uplink signal into the first optical uplink signal, and transmits the first optical uplink signal to the REC. 
 
 
     
     
       21. The radio frequency signal transceiving device according to  claim 19 ,
 wherein the second RE:
 receives the second optical downlink signal from the first RE; 
 converts the second optical downlink signal into a third integrated analog downlink signal; 
 derives a second analog downlink signal and a second downlink control signal from the third integrated analog downlink signal, wherein the second analog downlink signal is at a second frequency; 
 demodulates the second analog downlink signal into the second radio downlink signal; and 
 transmits the second radio downlink signal. 
 
 
     
     
       22. The radio frequency signal transceiving device according to  claim 21 ,
 wherein the second RE:
 receives a second radio uplink signal; 
 modulates the second radio uplink signal into a second analog uplink signal at the second frequency; 
 generates a second uplink control signal responding to the second downlink control signal; 
 multiplexes the second analog uplink signal and the second uplink control signal into the first integrated analog uplink signal; 
 converts the first integrated analog uplink signal into the second optical uplink signal; and 
 transmits the second optical uplink signal. 
 
 
     
     
       23. The radio frequency signal transceiving device according to  claim 22 , wherein:
 when the second radio front end circuit receives the second radio uplink signal and the second uplink control signal, the second radio front end circuit modulates the second radio uplink signal into the second analog uplink signal at the second frequency, and the second RE further comprising: 
 a third electric-to-optical converter (E/O), coupled to the second radio front end circuit, converts second analog uplink signal into the optical uplink signal. 
 
     
     
       24. The radio frequency signal transceiving device according to  claim 23 , wherein:
 the first RE further comprising:
 a first slave control unit, coupled to the first radio front end circuit, extracts the first downlink control signal from the first integrated analog downlink signal, generates a first control message according to the first downlink control signal, and transmits the first control message to the first radio front end circuit, wherein the first radio front end circuit derives the first analog downlink signal, the first downlink control signal, and the second integrated analog downlink signal from first integrated analog downlink signal according to the first control message; and 
 
 the second RE further comprising:
 a second slave control unit, coupled to the second radio front end circuit, extracts the second downlink control signal from the third integrated analog downlink signals, generates a second control message according to the second control signal, and transmits the second control message to the second radio front end circuit, wherein the second radio front end circuit derives the second analog downlink signal and the second downlink control signal from third integrated analog downlink signal according to the second control message. 
 
 
     
     
       25. The radio frequency signal transceiving device according to  claim 24  wherein:
 the first slave control unit:
 generates a first uplink control signal responding to the first downlink control signal; 
 adjust a link gain for the first radio downlink signal and the first uplink signal to be equal; 
 
 the second slave control unit:
 generates a second uplink control signal responding to the second downlink control signal; 
 adjust the link gain for the second radio downlink signal and the second uplink signal to be equal; and 
 
 the master control unit:
 controls and monitors the RRUs according to the first downlink control signal, the second downlink control signal, the first uplink control signal and the second uplink control signal; and 
 estimates the round trip delay from the REC to one of the REs; and 
 changes a link performance by exchanging the first downlink control signal, the first uplink control signal, the second downlink control signal and the second uplink control signal between the REC with the first RE and second RE at least, wherein the link performance comprising a dynamic range. 
 
 
     
     
       26. The radio frequency signal transceiving device according to  claim 19 , wherein the REC further comprising:
 an REC optical to electronic converter (O/E), receives the first optical uplink signal, and converts the first optical uplink signal into the first integrated analog uplink signal; 
 a de-multiplexer, coupled to the REC O/E and the first front end circuit and the second front end circuit, de-multiplexes the first integrated analog uplink signal into the first analog uplink signal at the first frequency and the second analog uplink signal at the second frequency, and respectively transmits the first analog uplink signal and the second analog uplink signal to the first front end circuit and the second front end circuit, 
 wherein the first front end circuit demodulates the first analog uplink signal into a first radio uplink signal when receiving the first analog uplink signal, and transmits the first radio uplink signal; and 
 the second front end circuit demodulates the second analog uplink signal into a second radio uplink signal when receiving the second analog uplink signal, and transmits the second radio uplink signal. 
 
     
     
       27. A self-optimizing optical transmission method configured for an optical transmission device to self monitor and self adjustment, comprising:
 generating a testing signal at a master end; 
 combining the testing signal into an integrated analog downlink signal and converting the integrated analog downlink signal into the optical downlink signal at the master end; 
 converting the optical downlink signal to the integrated analog downlink signal, deriving the testing signal from the integrated analog downlink signal, combining the testing signal into an integrated analog uplink signal, and converting the integrated analog uplink signal into an optical uplink signal at a slave end; 
 receiving the optical uplink signal at the master end; 
 converting the optical uplink signal to the integrated analog uplink signal, and splitting the testing signal from the integrated analog uplink signal at the master end; 
 analyzing the testing signal to generate a testing result, wherein the testing result comprising a error vector magnitude (EVM) value; and 
 adjusting an input level and a driving current of a plurality of E/Os and output levels and driving currents of O/Es at the master end and the slave end via generating a master control signal and a slave control signal according to the testing result. 
 
     
     
       28. The self-optimizing optical transmission method according to  claim 27 , wherein:
 the test signal comprising a radio downlink signal; and 
 wherein the step of combining the testing signal into the integrated analog uplink signal comprising: 
 combining the testing signal into the integrated analog uplink signal by switching or coupling. 
 
     
     
       29. The self-optimizing optical transmission method according to  claim 28 , the method further comprising:
 periodically generating the testing signal, in order to derives the EVM value; 
 when the EVM value is bigger than a magnitude threshold, performing a self-diagnose process to get a plurality of updated EVM values corresponding to a plurality of generated gain adjustment (GA) values and a plurality of the driving currents; and 
 if the updated EVM value is smaller than the threshold, storing the corresponding GA values and the corresponding driving currents, and adjusting the input levels and the driving currents of the E/Os and the output levels and the driving currents of the O/Es via the master control signal and the slave control signal according to the corresponding GA value and the corresponding driving current; and 
 if the updated EVM value is bigger than the threshold, performing an alarm process. 
 
     
     
       30. The self-optimizing optical transmission method according to  claim 29 , wherein the self-diagnose process comprising:
 setting a set of GA candidates and a set of driving currents candidates; 
 adjusting the driving currents of the E/Os and the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the set of driving currents candidates; 
 adjusting the input levels of the E/Os and the output levels of the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the set of GA candidates; 
 generating the testing signal when the input levels and the driving currents of the E/Os and the output levels and the driving currents of the O/Es at the master end and the slave end being adjusted; 
 analyzing the testing results of the testing signals corresponding to the set of GA candidates and the set of driving current candidates, and choosing the driving current candidate that corresponds to a maximum dynamic range as an updated driving current and setting an updated GA value to adjust the input level of the E/Os and the output level of the O/Esat the master end and the slave end to meet the maximum dynamic range; 
 setting the driving currents of the E/Os and the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the updated driving current; and 
 setting the input levels of the E/Os and the output levels of the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the updated GA value, 
 wherein the dynamic range comprising a maximum input level and a minimum input level of the EVM value less than the threshold for the driving current. 
 
     
     
       31. A self-optimizing optical transmission device, configured for self-monitoring and self-adjustment, comprising a master end and a slave end:
 wherein the master end, comprising:
 a vector signal generator, generates a testing signal; 
 a master electric-to-optical converter (E/O), coupled to the VSG, combines the testing signal into an integrated analog downlink signal and converts the integrated analog downlink signal into the optical downlink signal 
 a master optical-to-electric converter (O/E), receives an optical uplink signal, converts the optical uplink signal to an integrated analog uplink signal, and splits the testing signal from the integrated analog uplink signal; and 
 a vector signal analyzer (VSA), coupled to the master O/E, analyzes the testing signal to generate a testing result, wherein the testing result comprising a error vector magnitude (EVM) value; 
 a master control unit, coupled to the master E/O, the master O/E, the VSG and the VSA, receives the testing result, and adjusts an input level and a driving current of the master E/O and an output level and a driving current of the master O/E via generating a master control signal according to the testing result; and 
 
 wherein the slave end comprising:
 a slave O/E, coupled to the master E/O, receives and converts the optical downlink signal into the integrated analog downlink signal; 
 a slave E/O, coupled to the slave O/E, converts the integrated analog uplink signal into the optical uplink signal; 
 a splitter, coupled to the slave O/E, splits the testing signal from the integrated analog downlink signal; 
 a combiner, coupled to the slave E/O; combines the testing signal into the integrated analog uplink signal; and 
 a slave control unit, coupled to the slave O/E, the slave E/O, the splitter, and the combiner, adjusts the input level and the driving current of the slave E/O and the output level and the driving current of the slave O/E by a gain adjustment (GA) value via the master control signal and a slave control signal exchanging between the master control unit and the slave control unit according to the testing result. 
 
 
     
     
       32. The self-optimizing optical transmission device according to  claim 31 , wherein:
 the O/E further comprising a driving current circuit and a GA unit; and 
 the E/O further comprising a driving current circuit and a GA unit; and 
 the GA unit further comprising a plurality of amplifiers and a plurality of step attenuators, wherein the amplifiers and the step attenuators are configured to adjust input levels of the E/Os and the output levels of the O/Es. 
 
     
     
       33. The self-optimizing optical transmission device according to  claim 31 , wherein:
 the master control unit periodically controls the VSG to generate the testing signal, in order to derive the EVM value; 
 when the EVM value is bigger than a magnitude threshold, the master control unit performs a self-diagnose process to get a plurality of updated GA values, a plurality of driving currents; 
 if the updated EVM value is smaller than the magnitude threshold, the master control unit stores the corresponding GA values and corresponding driving currents, and the master control unit adjusts the input levels and the driving currents of the E/Os and the output levels and the driving currents of the O/Es via the master control signal and the slave control signal according to the corresponding GA values and the corresponding driving currents. 
 
     
     
       34. The self-optimizing optical transmission device according to  claim 33 , wherein:
 if the updated EVM value is bigger than the magnitude threshold, the master control unit performs an alarm process. 
 
     
     
       35. The self-optimizing optical transmission device according to  claim 34 , wherein the self-diagnose process comprising:
 setting a set of GA candidates and a set of driving currents candidates; 
 adjusting the driving currents of the E/Os and the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the set of driving currents candidates; 
 adjusting the input levels of the E/Os and the output levels of the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the set of GA candidates; 
 controlling the VSG to generate testing signal when the input levels and the driving currents of the E/Os and the output levels and the driving currents of the O/Es at the master end and the slave end being adjusted; 
 analyzing the testing results of the testing signals corresponding to the set of GA candidates and the set of driving current candidates, and choosing the driving current candidate that corresponds to the maximum dynamic range as an updated driving current and setting an updated GA value to adjust the input level of the E/Os and the output level of the O/Es at the master end and the slave end to meet the maximum dynamic range; 
 setting the driving currents of the E/Os and the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the updated driving current; and 
 setting the input levels of the E/Os and the output levels of the O/Es at the master end and the slave end both via the master control signal and the slave control signal according to the updated GA value.