Method and system for determining correct escape mechanisms and controlling interference in third generation wireless systems
First Claim
1. A method for controlling interference in a wireless communication network having overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage areas, wherein a communication is transmitted in a time slotted channel, the method comprising:
- measuring a level of interference in each time slot;
determining whether the interference is continuous or discontinuous over a predetermined number of time slots;
employing a hand over mechanism if the interference is determined to be continuous; and
employing a TDD escape mechanism if the interference is determined to be discontinuous.
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Accused Products
Abstract
A correct escape mechanism is determined according to interference type. Transmission is arranged so that interference may be measured at all time slots as needed to compute a measure of variance in interference in time slots. If the variance is above a predetermined value, time division duplex escape mechanisms are employed. If the variance is below a predetermined value, appropriate escape mechanisms are employed depending on whether the escape mechanism is being implemented during an uplink or downlink. Interference causing FDD WTUs may be handed over to carrier bands to control interference experienced by TDD users.
31 Citations
21 Claims
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1. A method for controlling interference in a wireless communication network having overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage areas, wherein a communication is transmitted in a time slotted channel, the method comprising:
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measuring a level of interference in each time slot;
determining whether the interference is continuous or discontinuous over a predetermined number of time slots;
employing a hand over mechanism if the interference is determined to be continuous; and
employing a TDD escape mechanism if the interference is determined to be discontinuous. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling interference in a wireless communication network having an overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage area where a communication is transmitted in a time slotted channel, the method comprising:
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determining a level of interference experienced by a TDD wireless transmit receive unit (WTRU) operating in a TDD mode in a TDD coverage area;
locating an FDD WTRU operating in an FDD mode in a first frequency band in the TDD coverage area; and
handing over the FDD WTRU to a second frequency band if the level of interference is above a predetermined threshold. - View Dependent Claims (7, 8)
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9. A system for controlling interference in a wireless communication network having an overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage area where a communication is transmitted in a time slotted channel, the system comprising:
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a wireless transmit/receive unit comprising;
a detector for detecting an interference level of a current channel; and
,a transmitter for reporting the interference level;
a radio network controller comprising;
a processor configured to determine whether the reported interference is continuous or discontinuous over a certain number of time slots, and to employ a hand over mechanism if the interference is continuous or a TDD escape mechanism if the interference is discontinuous. - View Dependent Claims (10, 11, 12, 13)
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14. A system for controlling interference in a wireless communication network having an overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage area where a communication is transmitted over a time slotted channel, the system comprising:
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a TDD wireless transmit/receive unit (WTRU) operating in a TDD mode in a TDD coverage area comprising means for measuring an interference level experienced by the TDD WTRU;
a radio network controller comprising;
a processor configured to locate an FDD WTRU operating in an FDD mode in a first frequency band in the TDD coverage area; and
to hand over the FDD WTRU to a second frequency band if the interference level is above a predetermined threshold. - View Dependent Claims (15, 16)
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17. A wireless transmit/receive unit (WTRU) for use in a wireless communication network having interference controls and an overlapping time division duplex (TDD) and frequency division duplex (FDD) coverage area, the WTRU comprising:
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a detector for detecting an interference level of a current channel;
a transmitter for transmitting the interference level to a radio network controller (RNC) to enable the RNC to provide the WTRU with an appropriate mechanism for mitigating the effect of interference on the current channel; and
a processor configured to employ an interference control mechanism determined by the radio network controller. - View Dependent Claims (18, 19, 20, 21)
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Specification