초록 ▼

When insufficient traffic is present in the network to maintain synchronization in this manner, other methods must be used. One approach involves making direct measurements of the timing between base stations. This is accomplished in one of two ways. The base may interrupt its transmissions on all s

When insufficient traffic is present in the network to maintain synchronization in this manner, other methods must be used. One approach involves making direct measurements of the timing between base stations. This is accomplished in one of two ways. The base may interrupt its transmissions on all sectors for a short interval during which it determines the time of arrival of signals from other base stations. Given knowledge of the other base station locations, time errors relative to all other base stations may be derived. Alternatively, the base may send a short signal at high power in the mobile transmit band. This time-of-arrival of this signal is measured by the surrounding base stations and the time errors between pairs of base stations are computed. In some cases, a base station may be isolated sufficiently from all other base stations in the network such that direct base-to-base measurement is not viable. In this case, a fixed mobile is placed at a location in the handoff region between the isolated cell and another cell in the network. The fixed mobile either performs measurements of base station pilots on command of the base and reports the timing information, or sends a burst transmission at a specified time and power level to be measured by the base stations.

대표청구항 ▼

When insufficient traffic is present in the network to maintain synchronization in this manner, other methods must be used. One approach involves making direct measurements of the timing between base stations. This is accomplished in one of two ways. The base may interrupt its transmissions on all s

When insufficient traffic is present in the network to maintain synchronization in this manner, other methods must be used. One approach involves making direct measurements of the timing between base stations. This is accomplished in one of two ways. The base may interrupt its transmissions on all sectors for a short interval during which it determines the time of arrival of signals from other base stations. Given knowledge of the other base station locations, time errors relative to all other base stations may be derived. Alternatively, the base may send a short signal at high power in the mobile transmit band. This time-of-arrival of this signal is measured by the surrounding base stations and the time errors between pairs of base stations are computed. In some cases, a base station may be isolated sufficiently from all other base stations in the network such that direct base-to-base measurement is not viable. In this case, a fixed mobile is placed at a location in the handoff region between the isolated cell and another cell in the network. The fixed mobile either performs measurements of base station pilots on command of the base and reports the timing information, or sends a burst transmission at a specified time and power level to be measured by the base stations. ignal; and a receive interface circuit directly interfacing the data path signal to the output signal wherein the transmit interface circuit further includes: a plurality of input modulation types, one of which represents the modulation type corresponding to the input signal; a plurality of output modulation types, one of which represents the modulation type corresponding to a data path signal, and an interface matrix which directly interfaces the modulation type corresponding to the data path signal to the modulation type corresponding to the input signal. 2. The system as recited in claim 1, wherein the interface matrix directly interfaces the input signal to the data path signal with no more than one modulation conversion. 3. The system as recited in claim 2, wherein the mobile telephonic communication system is a cellular communication system. 4. The system as recited in claim 2, wherein the modulation types are code division multiple access. 5. The system as recited in claim 2, wherein the modulation types are time division multiple access. 6. The system as recited in claim 2, wherein the modulation types are global standard for mobile communications. 7. The system as recited in claim 1, wherein the interface matrix directly interfaces a radio frequency input signal to a radio frequency data path signal. 8. The system as recited in claim 7, wherein the mobile telephonic communication system is a cellular communication system. 9. The system as recited in claim 7, wherein the modulation types are code division multiple access. 10. The system as recited in claim 7, wherein the modulation types are time division multiple access. 11. A mobile telephonic communication system, comprising: a transmitting unit for transmitting an input signal corresponding to an input modulation type of modulation types including time division multiple access and code division multiple access; a receiving unit for receiving an output signal corresponding to an output modulation type, and a direct interface system directly interfacing the input signal to the output signal wherein the direct interface system further includes; a transmit interface circuit directly interfacing the input signal to a data path signal; and a receive interface circuit directly interfacing the data path signal to the output signal wherein the receive interface circuit further includes; a plurality of input modulation types, one of which represents the modulation type corresponding to the output signal; a plurality of output modulation types, one of which represents the modulation type corresponding a data path signal; and an interface matrix which directly interfaces the modulation type corresponding to the data path signal to the modulation type corresponding to the output signal. 12. The system as recited in claim 11, wherein the interface matrix directly interfaces the input signal to the data path signal with no more than one modulation conversion. 13. The system as recited in claim 12, wherein the mobile telephonic communication system is a cellular communication system. 14. The system as recited in claim 12, wherein the modulation types are code division multiple access. 15. The system as recited in claim 12, wherein the modulation types are time division multiple access. 16. The system as recited in claim 11, wherein the interface matrix directly interfaces a radio frequency input signal to a radio frequency data path signal. 17. The system as recited in claim 16, wherein the mobile telephonic communication system is a cellular communication system. 18. The system as recited in claim 16, wherein the modulation types are code division multiple access. 19. The system as recited in claim 16, wherein the modulation types are time division multiple access. 20. The system as recited in claim 1, wherein the transmit interface circuit further includes: a plurality of transmit input modulation types, one of which represents the modulation type correspo nding to the input signal; a plurality of transmit output modulation types, one of which represents the modulation type corresponding a data path signal; a transmit interface matrix which directly interfaces the modulation type corresponding to the data path signal to the modulation type corresponding to the input signal; a plurality of receiving input modulation types, one of which represents the modulation type corresponding to the output signal; a plurality of receiving output modulation types, one of which represents the modulation type corresponding a data path signal; and a receiving interface matrix which directly interfaces the modulation type corresponding to the data path signal to the modulation type corresponding to the output signal. 21. The system as recited in claim 20, wherein the transmit interface matrix directly interfaces the input signal to the data path signal with no more than one modulation conversion and the receive interface matrix directly interfaces the data path signal to the output signal with no modulation conversion. 22. The system as recited in claim 21, wherein the mobile telephonic communication system is a cellular communication system. 23. The system as recited in claim 21, wherein the modulation types are code division multiple access. 24. The system as recited in claim 21, wherein the modulation types are time division multiple access. 25. The system as recited in claim 20, wherein the transmit interface matrix directly interfaces a radio frequency input signal to a radio frequency data path signal with no more than one modulation conversion and the receive interface matrix directly interfaces a radio frequency data path signal to a radio frequency output signal with no modulation conversion. 26. The system as recited in claim 25, wherein the mobile telephonic communication system is a cellular communication system. 27. The system as recited in claim 25, wherein the modulation types are code division multiple access. 28. The system as recited in claim 25, wherein the modulation types are time division multiple access. 29. The system as recited in claim 11, wherein the direct interface system further includes: a switch; and an interface circuit directly interfacing the input signal to the output signal within the switch. 30. The system as recited in claim 29, wherein the interface circuit further includes: a plurality of input modulation types, one of which represents the modulation type corresponding to the input signal; a plurality of output modulation types, one of which represents the modulation type corresponding the output signal; and an interface matrix which directly interfaces the modulation type corresponding to the output signal to the modulation type corresponding to the input signal. 31. The system as recited in claim 30, wherein the mobile telephonic communication system is a cellular communication system. 32. The system as recited in claim 30, wherein the modulation types are code division multiple access. 33. The system as recited in claim 30, wherein the modulation types are time division multiple access. 34. The system as recited in claim 30, wherein the interface matrix directly interfaces the input signal to the output signal with no more than one modulation conversion. 35. The system as recited in claim 34, wherein the mobile telephonic communication system is a cellular communication system. 36. The system as recited in claim 34, wherein the modulation types are code division multiple access. 37. The system as recited in claim 34, wherein the modulation types are time division multiple access. 38. The system as recited in claim 30, wherein the interface matrix directly interfaces a radio frequency input signal to a radio frequency output signal. 39. The system as recited in claim 38, wherein the mobile telephonic communication system is a cellular communication system. 40. The system as recited in claim 38, wherein the modulation types are code div