Method and arrangement for generating pilot beacons in wireless communication systems
View Patent ↗In a method for generating pilot beacons for hard handoff over a border from a first environment to a second environment, the two environments using spread spectrum technology, a RF pilot signal may be received at an operational frequency used in at least the second environment. The RF signal may be downconverted to an IF pilot signal, filtered and then upconverted to a first reproduced RF pilot signal. The first reproduced RF pilot signal may be at a operational frequency used in a first environment, and may represent a pilot beacon for hard handoff between the first and second environments. The method and arrangement may be configured to receive a pilot beacon from one environment and to generate N pilot beacons, in that one environment, for up to N different operational frequencies used in another environment from which a mobile user is transiting, for hard handoff between the environments.
1. A method for generating pilot beacons for hard handoff over a border from a first environment to a second environment using spread spectrum technology, comprising:
receiving an RF pilot signal on an operational frequency used in the second environment;
downconverting the RF pilot signal to an IF pilot signal;
filtering the IF pilot signal;
first upconverting the entire filtered IF signal to a first reproduced RF pilot signal that is at an operational frequency used in the first environment, and which represents a pilot beacon for hard handoff from the first environment to the second environment;
second upconverting the entire filtered IP signal to a second reproduced RF pilot signal that is at the operational frequency used in the first environment; and
transmitting the first reproduced RF pilot signal and the second reproduced RF pilot signal to a base station,
wherein the first environment has an operational frequency that is different from one or more operational frequencies in the second environment.
2. The method of claim 1 , wherein the first environment is one of an indoor environment and an outdoor environment.
3. The method of claim 1 , wherein the second environment is one of an indoor environment and an outdoor environment.
4. The method of claim 2 , wherein the indoor environment is a private spread spectrum communication system employing one of CDMA and UMTS technology, and the outdoor environment is a public spread spectrum communication system employing one of CDMA and UMTS technology.
5. The method of claim 3 , wherein the indoor environment is a private spread spectrum communication system employing one of CDMA and UMTS technology, and the outdoor environment is a public spread spectrum communication system employing one of CDMA and UMTS technology.
6. The method of claim 1 , wherein the first environment and second environment are two neighboring cells in a spread spectrum communication system employing one of CDMA and UMTS technology.
7. The method of claim 1 , wherein the different operational frequency is one or more additional operational frequencies belonging to one of the first and second environments, and at least one of the operational frequencies in the first environment and second environment are the same operational frequencies.
8. The method of claim 1 , wherein the first reproduced RF pilot signal is transmitted over a channel in a transmit band of a cellular spectrum of the base station.
9. The method of claim 1 , wherein the second reproduced RF pilot signal is transmitted over a channel in a receive band of a cellular spectrum of the base station, the second reproduced RF signal being a confirmation signal indicating whether or not a beacon signal is present.
10. The method of claim 1 , wherein said receiving further comprises receiving the RF pilot signal over one of an air link and a cabled medium.
11. The method of claim 1 , further comprising:
transmitting the pilot beacon to a mobile user in the first environment.
12. The method of claim 11 , wherein said receiving and transmitting are performed over the same antenna.
13. A method for generating N pilot beacons for hard handoff over a border from a first environment to a second environment using spread spectrum technology, comprising:
receiving a RF pilot signal at an operational frequency used in the second environment;
downconverting the RF pilot signal to an IF pilot signal;
filtering the IF pilot signal; and
performing a first set of N upconverting operations on the entire filtered IF signal to form a first set of N reproduced RF pilot signals, wherein each Nth reproduced RF pilot signal of the first set is at a particular operational frequency used in the first environment and represents a pilot beacon for hard handoff from the first environment to the second environment; and
performing a second set of N upconverting operations on the entire filtered IF signal to form a second set of N reproduced RF pilot signals, wherein each N reproduced RF pilot signal of the second set is at a particular operational frequency used in the first environment; and
transmitting the first set of N reproduced RF pilot signals and the second set of N reproduced RF pilot signals to a base station,
wherein the first environment has an operational frequency that is different from one or more operational frequencies in the second environment.
14. The method of claim 13 , further comprising:
wherein the first set of N reproduced RF pilot signals is transmitted over a corresponding channel assigned to each Nth pilot beacon in a transmit band of a cellular spectrum of the base station.
15. The method of claim 14 , wherein said receiving and transmitting are performed over the same antenna.
16. The method of claim 13 , wherein the second set of N reproduced RF pilot signals is transmitted over a corresponding channel assigned to each Nth pilot beacon in a receive band of a cellular spectrum of the base station, the second set of N reproduced RF pilot signals being confirmation signals indicating whether or not a beacon signal is present in the second environment.
17. The method of claim 13 , wherein the first and second environments employ one of CDMA and UMTS technology.
18. The method of claim 13 , wherein the first environment and second environment are two neighboring cells in a spread spectrum communication system employing one of CDMA and UMTS technology.
19. The method of claim 13 , wherein said receiving further comprises receiving the RF pilot signal over one of an air link and a cabled medium.
20. An arrangement for generating pilot beacons for hard handoff over a border between first and second environments using spread spectrum technology, comprising:
receiving means for receiving an RF pilot signal on an operational frequency used in the second environment;
downconverting means for downconverting the RF pilot signal to an IF pilot signal;
filtering means for filtering the IF pilot signal; and
first mixing means for upconverting the entire filtered IF signal to a first reproduced RF pilot signal that is at an operational frequency used in the first environment, and which represents a pilot beacon for hard handoff from the first environment to the second environment,
second mixing means for upconverting the entire filtered IF signal to a second reproduced RF pilot signal that is at the operational frequency used in the first environment; and
transmitting means for transmitting the first reproduced RF pilot signal and the second reproduced RF pilot signal to a base station,
wherein the first environment has an operational frequency that is different from one or more operational frequencies in the second environment.
21. The arrangement of claim 20 ,
wherein the transmitting means transmits the first reproduced RF pilot signal over a channel in a transmit band of a cellular spectrum of the base station.
22. The arrangement of claim 21 , wherein said receiving means and transmitting means employ the same antenna.
23. The arrangement of claim 20 , wherein the transmitting means transmits the second reproduced RF pilot signal over a channel in a receive band of a cellular spectrum of the base station, the second reproduced RF pilot signal being a confirmation signal indicating whether or not a beacon signal is present.
24. The arrangement of claim 20 , wherein said first and second mixing means is further adapted to upconvert the entire filtered IF signal to first and second N reproduced RF pilot signals that are at N operational frequencies used in the first environment.
25. The arrangement of claim 24 , wherein
the transmitting means transmits the first N reproduced RF pilot signals corresponding channels assigned to each Nth pilot beacon in a transmit band of a cellular spectrum of the base station.
26. The arrangement of claim 25 , wherein said receiving means and transmitting means employ the same antenna.
27. The arrangement of claim 24 , wherein the transmitting means transmits the second N reproduced RF pilot signals over a corresponding channel in a receive band of a cellular spectrum of the base station, the second N reproduced RF pilot signals being confirmation signals indicating whether or not a beacon signal is present.
28. The arrangement of claim 27 , wherein the first and second environments employ one of CDMA and UMTS technology.
29. The arrangement of claim 27 , wherein the first environment and second environment are two neighboring cells in a spread spectrum communication system employing one of CDMA and UMTS technology.
30. The arrangement of claim 27 , wherein said receiving means receives the RF pilot signal over one of an air link and a cabled medium.