DAA concept with uplink detection: frequency domain quiet periods
A victim wireless device is detected by obtaining a set of wireless bands and a set of time periods. During a given time period a subset of wireless bands corresponding to that time period is vacant and a remaining subset of wireless bands is used to exchange data. During each of the time periods in the set of time periods: a signal, if any, is received; in the event a signal is received, the subset of vacant wireless bands corresponding to that time period is recorded; and after the set of time periods ends, it is determined whether there is a victim wireless device based at least in part on the number of vacant wireless bands recorded.
1 . A method for detecting a victim wireless device, comprising:
obtaining a set of wireless bands and a set of time periods, wherein during a given time period a subset of wireless bands corresponding to that time period is vacant and a remaining subset of wireless bands is used to exchange data;
during each of the time periods in the set of time periods:
receiving a signal, if any; and
in the event a signal is received, recording the subset of vacant wireless bands corresponding to that time period; and
after the set of time periods ends, determining whether there is a victim wireless device based at least in part on the number of vacant wireless bands recorded.
2 . The method as recited in claim 1 , wherein the method is performed by an ultra wideband (UWB) wireless device.
3 . The method as recited in claim 2 , wherein the UWB wireless device includes a WiMedia UWB wireless device.
4 . The method as recited in claim 1 , wherein it is determined there is a victim wireless device if the number of vacant wireless bands is one.
5 . The method as recited in claim 4 , wherein the number of vacant wireless bands is one includes a sole vacant wireless band recorded a plurality of times.
6 . The method as recited in claim 1 , wherein:
a base station transmits a downlink to the victim wireless device on one of the wireless bands in the set of wireless bands; and
the victim wireless device is configured to not transmit unless the downlink is received.
7 . The method as recited in claim 1 , wherein each of the set of time periods is a positive integer number of superframes long.
8 . The method as recited in claim 1 , wherein the method includes repeating a sequence of time frequency codes (TFCs) a plurality of times.
9 . The method as recited in claim 1 , further including during each of the time periods in the set of time periods: tuning a receiver to one or more of the subset of wireless bands used to exchange data during a period in which a wireless device performing the method is involved in exchanging data.
10 . The method as recited in claim 1 , further including during each of the time periods in the set of time periods: tuning a receiver to one or more of the subset of vacant wireless bands during a period in which a wireless device performing the method is not involved in exchanging data.
11 . The method as recited in claim 1 , further including not exchanging data on the recorded subset of vacant wireless bands in the event it is determined there is a victim wireless device.
12 . The method as recited in claim 1 , further including exchanging data in the set of wireless bands in the event it is determined there is a victim wireless device.
13 . The method as recited in claim 1 , further including:
activating a wireless device;
processing a receive signal to detect an existing group of wireless devices, if any; and
in the event an existing group of wireless devices is detected, joining the group of wireless devices.
14 . The method as recited in claim 13 , further including starting a new group of wireless devices in the event an existing group of wireless devices is not detected.
15 . A system for detecting a victim wireless device, comprising:
an interface configured to obtain a set of wireless bands and a set of time periods, wherein during a given time period a subset of wireless bands corresponding to that time period is vacant and a remaining subset of wireless bands is used to exchange data; and
a signal processor which is configured during each of the time periods in the set of time periods to:
receive a signal, if any; and
in the event a signal is received, record the subset of vacant wireless bands corresponding to that time period; and
after the set of time periods ends, determine whether there is a victim wireless device based at least in part on the number of vacant wireless bands recorded.
16 . A computer program product for detecting a victim wireless device, the computer program product being embodied in a computer readable storage medium and comprising computer instructions for:
obtaining a set of wireless bands and a set of time periods, wherein during a given time period a subset of wireless bands corresponding to that time period is vacant and a remaining subset of wireless bands is used to exchange data;
during each of the time periods in the set of time periods:
receiving a signal, if any; and
in the event a signal is received, recording the subset of vacant wireless bands corresponding to that time period; and
after the set of time periods ends, determining whether there is a victim wireless device based at least in part on the number of vacant wireless bands recorded.