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1. WO2010008797 - METHOD AND APPARATUS FOR SWITCHING IN A TDD SYSTEM

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[ EN ]

CLAIMS

What is claimed is:

1. A method of switching a communication device between an uplink communication path and a downlink communication path, the method comprising: measuring a power level of signals on at least one radio frequency for one of the uplink communication path and downlink communication path; comparing the measured power level with a threshold power level; and switching between the uplink communication path and the downlink communication path based on the comparison between the measured power level and the threshold power level.

2. The method of claim 1 , wherein measuring the power level further comprises continually measuring the power level, and wherein comparing the measured power level further comprises determining when the measured power level reaches the threshold power level.

3. The method of claim 2, wherein determining when the measured power level reaches the threshold power level, determines when the measured power level drops to less than or equal to the threshold power level.

4. The method of claim 3, wherein switching between the uplink communication path and the downlink communication path comprises switching from the downlink communication path to the uplink communication path based on when the power level drops to less than or equal to the threshold power level.

5. The method of claim 3, further comprising: after determining that the measured power level is less than or equal to the threshold power level, continually measuring the power level of signals on the at least one radio frequency for a period of time; determining whether the power level rises above the threshold power level during the period of time; and wherein switching between an uplink circuit and a downlink circuit, switches based on whether the power level rose above the threshold power level within the period of time.

6. The method of claim 3, further comprising: comparing a time that the measured power level drops to less than or equal to the threshold power level with a time of a transmission boundary; wherein switching between the uplink communication path and the downlink communication path comprises switching based on the comparison between the time the measured power level drops to less than or equal to the threshold power level and the time of the transmission boundary.

7. The method of claim 6, wherein the time that the measured power level drops to less than or equal to the threshold power level, and the time of the transmission boundary are both measured from a previous transmission boundary.

8. The method of claim 3, wherein determining when the measured power level drops to less than or equal to the threshold power level determines when an end of a transmission subframe occurs.

9. The method of claim 1 , wherein measuring measures the power level of signals for the downlink communication path.

10. The method of claim 1 , wherein comparing the measured power level to a threshold power level compares the measure power level to a threshold power level determined by: measuring an on power level of signals on the at least one radio frequency when transmissions are present on the at least one radio frequency; measuring an off power level of signals on the at least one radio frequency when transmissions are not present on the at least one radio frequency; and setting the threshold power level at a point between the on power level and the off power level.

11. The method of claim 10, wherein setting the threshold power level sets the threshold power level at a midpoint between the on power level and the off power level.

12. An apparatus for switching between uplink and downlink transmission circuits, the apparatus comprising: a switch having a first port coupled to an uplink circuit, and a second port coupled to a downlink circuit; a power level detector configured to measure a power level of signals propagating through the switch; a comparator configured to compare the measured power level to a threshold power level; and a processing device configured to control the switch based on the comparison between the measured power level and the threshold power level.

13. The apparatus of claim 12, wherein the comparator is configured to determine when the measured power level falls below a threshold power level.

14. The apparatus of claim 12, wherein the power level detector is configured to continually measure a power level of signals propagating through the switch and wherein the comparator is configured to continually compare the measured power level to the threshold power level, wherein the comparator is configured to send an interrupt signal to the processing device when the measure powered level reaches the threshold power level.

15. The apparatus of claim 14, wherein comparator is configured to send an interrupt signal to the processing device each time the measured power crosses the threshold power level; and wherein the processing device is configured to wait an amount of time after receiving an interrupt before changing the switch to verify that no more interrupts are received.

16. The apparatus of claim 12, wherein the processing device is configured to calculate an amount of time between a transmission boundary and when the interrupt is received; the processing device further configured to compare the amount of time to a time period for a transmission structure, and control the switch based on the comparison between the amount of time and the time period.

17. The apparatus of claim 12, wherein the processing device is configured to switch the switch from the downlink circuit to the uplink circuit based on the comparison between the measured power level and the threshold power level.

18. The apparatus of claim 12, wherein the power level detector is configured to measure the power level of signals that are coupled to a common connection of the switch.

19. The apparatus of claim 12, wherein the power level detector is configured to measure the power level of downlink signals before the downlink signals reach the switch.

20. A communication system comprising: a plurality of remote antenna units communicatively coupled to a plurality of wireless terminals; at least one hub communicatively coupled to the plurality of remote antenna units, the at least one hub configured to communicatively couple signals between a base station and the plurality of remote antenna units, the at least one hub further comprising: a switch having a common connection, a first switched connection, and a second switched connection; an uplink circuit coupled to the first switched connection and configured to receive signals from the plurality of wireless terminals; a downlink circuit coupled the second switched connection and configured to transmit signals to the plurality of wireless terminals; a duplexing circuit connected to the common connection and configured to transmit and receive signals from the base station; and a processing device configured to control the switch based on a power level of signals on the duplexing circuit.

21. The system of claim 20, further comprising: a power level detector configured to measure a power level of signals on the duplexing circuit; a comparator configured to compare the measured power level to a threshold power level; and wherein the processing circuit is configured to control the switch based on the comparison of the measured power level and the threshold power level.

22. The system of claim 21, wherein the comparator is configured to send an interrupt signal to the processing device when the measured power level reaches the threshold power level.

23. The system of claim 22, wherein the processing device is configured to wait an amount of time after receiving an interrupt and before changing a position of the switch to verify that no more interrupts are received.

24. The system of claim 20, wherein the processing device is configured to control the switch based on a comparison between the time that the power level of signals on the duplexing circuit reaches a threshold power level and a time period of a transmission structure.