Abstract
Methods and apparatus to allocate reference signals in wireless communication systems are disclosed. A disclosed example method comprises applying a first cyclic shift to a first reference sequence during a first time interval and applying a second cyclic shift to a second reference sequence during a second time interval wherein the first and second cyclic shifts are members of a set of cyclic shifts assigned to devices of a wireless region.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | Yes | Basis Patent | ||||
4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Basis Patent | ||||
4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Basis Patent |
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US2007253465A1 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | Yes | Basis Patent | ||||
US2007253465A1 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Basis Patent | ||||
US2007253465A1 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Basis Patent | ||||
EP2016683A2 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
EP2016683A2 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
EP2016683A2 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
EP2016683A4 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
EP2016683A4 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
EP2016683A4 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
KR101035456B1 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
KR101035456B1 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
KR101035456B1 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
KR20080110937A | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
KR20080110937A | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
KR20080110937A | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
WO2007127902A2 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
WO2007127902A2 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
WO2007127902A2 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
WO2007127902A3 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
WO2007127902A3 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
WO2007127902A3 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
JP2009535936A | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
JP2009535936A | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
JP2009535936A | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
JP5017736B2 | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
JP5017736B2 | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
JP5017736B2 | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
CN101479951A | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN101479951A | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN101479951A | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
CN101479951B | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN101479951B | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN101479951B | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
CN103312486A | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN103312486A | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN103312486A | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member | ||||
CN103312486B | 4G | 03/04/2008 | ISLD-200804-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN103312486B | 4G | 21/03/2012 | ISLD-201203-017 | TEXAS INSTRUMENTS INC | No | Family Member | ||||
CN103312486B | 4G | 15/10/2015 | ISLD-201509-009 | TEXAS INSTRUMENTS INC | Yes | Family Member |
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Technologies
Product
Use Cases
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Claim
1. A method comprising:
applying a first cyclic shift to a first reference sequence during a first time interval of a signal;
applying a second cyclic shift to a second reference sequence during a second time interval of the signal, wherein the first cyclic shift differs from the second cyclic shift; and
the first and second cyclic shifts are members of a set of cyclic shifts assigned to devices of a wireless region.
2. A method as defined in claim 1, wherein the set of cyclic shifts defines an order in which devices of the wireless region are to apply cyclic shifts.
3. A method as defined in claim 1, wherein the first reference sequence is substantially randomly selected.
4. A method as defined in claim 1, further comprising selecting the first and second reference sequence from a set of reference sequences assigned to devices of a wireless region.
5. A method as defined in claim 4, wherein the set of reference sequences defines an order in which devices of the wireless region are to select a reference sequence.
6. A method as defined in claim 1, wherein the first wireless device is at least one of a user endpoint, a mobile station, a mobile terminal, an access point, a nodeB, a fixed station, wireless communication cell or wireless communication cell sector.
7. A method as defined in claim 1, wherein the first wireless device is at least one of an access point, a nodeB, a fixed station, or a cell tower, and wherein the second wireless device is at least one of a user endpoint, a mobile station, or a mobile terminal.
8. A method as defined in claim 1, wherein the first reference sequence and the second reference sequence are transmitted to the same wireless device during different time intervals.
9. A method as defined in claim 1, wherein the first reference sequence and the second reference sequence are the same.
10. An apparatus comprising:
a reference signal generator comprising:
a sequence selector to select a first reference sequence from a group of reference sequences assigned to a first wireless region and
a second reference sequence from a group of reference sequences assigned to a second wireless region;
a cyclic shift selector to select a first cyclic shift for a first time interval from a group of cyclic shifts assigned to a first wireless region;
a cyclic shifter to cyclically shift solely the first reference sequence based on the selected first cyclic shift to form a first reference signal; and
a transmit adapter to transmit the first reference signal during the first time interval via the wireless channel.
11. An apparatus as defined in claim 10, wherein the cyclic shift selector is to select a second cyclic shift for a second time interval from a group of cyclic shifts assigned to a second wireless region; and
wherein the cyclic shifter is to cyclically shift solely the reference sequence based on the second selected cyclic shift during a second time interval.
12. An apparatus as defined in claim 10, wherein the selection is based upon at least one of a frame number, a sub-frame offset, a slot offset, a transmitted symbol offset, a wireless region identifier, a NodeB identifier, a user endpoint identifier or a group identifier.
13. An apparatus as defined in claim 10, further comprising a modulator to modulate the first reference sequence, the modulator comprising:
a Fourier transform module to perform a Fourier transform of the first reference sequence;
an inverse Fourier transform module to perform an Inverse Fourier transform; and
an interface to map outputs of the Fourier transform to selected inputs of the Inverse Fourier transform.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.