Method, apparatus and computer program for open loop transmission diversity

• US 20090303978A1
• Filed: 06/04/2008
• Published: 12/10/2009
• Est. Priority Date: 06/04/2008
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Inventors: Pajukoski, Kari, Tiirola, Esa, Hooli, Kari
• Granted Patent: US 9,246,650 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A symbol multiplied by a first constant amplitude zero autocorrelation code CAZAC reference signal RS is transmitted in a timeslot from a first antenna of a user equipment on a first physical uplink control channel in a manner that multiplexes with other user equipments. A symbol multiplied by a second CAZAC RS is transmitted in the timeslot from a second antenna of the user equipment on a second physical uplink control channel in a manner that multiplexes with other user equipments. The first and second CAZAC RSs are orthogonal to one another by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second CAZAC RSs. The symbols may be the same or different, and may represent an ACK, a NACK, or a scheduling request indicator. These teachings extend to more than two transmit antennas.

Claims

1. A method comprising:

transmitting in a timeslot from a first antenna of a user equipment on a first physical uplink control channel using a first reference signal in a manner that multiplexes with other user equipments; and

transmitting in the timeslot from a second antenna of the user equipment on a second physical uplink control channel using a second reference signal in a manner that multiplexes with other user equipments,

wherein the first reference signal and the second reference signal comprises a cyclically shifted zero autocorrelation code and the second reference signal is orthogonal to the first reference signal by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals.

2. The method of claim 1, further comprising:

transmitting in the timeslot from a third antenna of the user equipment on a third physical uplink control channel using a third reference signal in a manner that multiplexes with other user equipments,

wherein the third reference signal channel comprises a cyclically shifted zero autocorrelation code and is orthogonal to both the first reference signal and the second reference signal by the said at least one of the cyclic shifts or a cover code applied to at least two of the first and the second and the third reference signals.

3. The method of claim 1, wherein the first reference signal is cyclically shifted by a first cyclic shift and the second reference signal is cyclically shifted by a second cyclic shift, and wherein the first and the second cyclic shifts are orthogonal to one another.

4. The method of claim 1, wherein the first and the second reference signals are orthogonal to one another at least by the cover code applied to at least one of them.

5. The method of claim 1, wherein transmitting from the first antenna and transmitting from the second antenna comprises a same symbol multiplied by the respective first and second reference signals.

6. The method of claim 1, wherein transmitting from the first antenna and transmitting from the second antenna comprises different symbols multiplied by the respective first and second reference signals.

7. The method of claim 1, wherein transmitting from the first and from the second antennas comprises one of:

transmitting a scheduling request indicator;

or

transmitting an acknowledgement for data received in a persistently allocated downlink resource wherein at least the first reference signal maps to the persistently allocated downlink resource;

or

transmitting a negative acknowledgement for data not received according to a persistently allocated downlink resource wherein at least the first reference signal maps to the persistently allocated downlink resource.

8. The method of claim 1, further comprising, prior to the transmitting from the first or the second antennas, receiving data on at least one physical downlink channel and mapping the at least one physical downlink channel to at least the first physical uplink control channel, and wherein transmitting from the first and from the second antenna each comprises an acknowledgement for the case where the data is properly received or a negative acknowledgement for the case where the data is not properly received.

9. The method of claim 8, wherein:

the at least one physical downlink channel is allocated to the user equipment dynamically on a physical downlink control channel, and

for the case where the at least one physical downlink channel is only one physical downlink channel, the user equipment maps the physical downlink channel to the first reference signal via a first control channel element of the one physical downlink control channel and maps the physical downlink channel to the second reference signal via a second control channel element of the one physical downlink control channel;

or

for the case where the at least one physical downlink channel is at least a first and a second physical downlink channel, the user equipment maps the physical downlink channel to the first reference signal via a control channel element of the first physical downlink control channel and maps the physical downlink channel to the second reference signal via a control channel element of the second physical downlink control channel.

10. The method of claim 1, wherein transmitting from each of the first and the second antennas comprises transmitting a channel quality indicator.

11. A device comprising a transmitter, a processor and at least a first and a second antenna,

wherein the transmitter is configured to transmit in a timeslot from the first antenna on a first physical uplink control channel using a first reference signal in a manner that multiplexes with other devices, and

the transmitter is further configured to transmit in the timeslot from the second antenna on a second physical uplink control channel using a second reference signal in a manner that multiplexes with other devices, wherein the first and the second reference signals comprise zero autocorrelation codes,

wherein the processor is configured to cyclically shift the first and the second reference signals and to render the first and the second reference signals orthogonal to one another by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals.

12. The device of claim 11, further comprising a third transmit antenna,

wherein the transmitter is further configured to transmit in the timeslot from the third antenna on a third physical uplink control channel using a third reference signal in a manner that multiplexes with other devices,

wherein the processor is further configured to cyclically shift the third reference signal and to render the first and the second and the third reference signals orthogonal to one another by the said at least one of the cyclic shifts or by a cover code applied to at least two of the first and the second and the third reference signals.

13. The device of claim 11, wherein the processor is configured to cyclically shift the first reference signal by a first cyclic shift and to cyclically shift the second reference signal by a second cyclic shift, wherein the first and the second cyclic shifts are orthogonal to one another.

14. The device of claim 11, wherein the processor is configured to render first and the second reference signals orthogonal to one another at least by the cover code applied to at least one of them.

15. The device of claim 11, wherein the transmitter is configured to transmit from the respective first and second antennas a same symbol multiplied by the respective first and second reference signals.

16. The device of claim 11, wherein the transmitter is configured to transmit from the respective first and second antennas different symbols multiplied by the respective first and second reference signals.

17. The device of claim 11, wherein the first and second reference signals are transmitted by the transmitter with one of:

a scheduling request indicator;

or

an acknowledgement for data received at a receiver of the device in a persistently allocated downlink resource, wherein the processor is configured to map at least the first reference signal to the persistently allocated downlink resource;

or

a negative acknowledgement for data not received at a receiver of the device according to a persistently allocated downlink resource, wherein the processor is configured to map at least the first reference signal to the persistently allocated downlink resource.

18. The device of claim 11, further comprising a receiver that is configured, prior to the transmitter transmitting from the first or the second antennas, to receive data on at least one physical downlink channel,

wherein the processor is configured to map the at least one physical downlink channel to at least the first physical uplink control channel,

and wherein the first and second reference signals are transmitted by the transmitter with an acknowledgement for the case where the receiver properly receives the data or a negative acknowledgement for the case where the receiver does not properly receive the data.

19. The device of claim 18, further comprising a receiver configured to receive an dynamic allocation of the at least one physical downlink channel, and

for the case where the at least one physical downlink channel is only one physical downlink channel, the processor is configured to map the physical downlink channel to the first reference signal via a first control channel element of the one physical downlink control channel and to map the physical downlink channel to the second reference signal via a second control channel element of the one physical downlink control channel;

or

for the case where the at least one physical downlink channel is at least a first and a second physical downlink channel, the processor is configured to map the physical downlink channel to the first reference signal via a control channel element of the first physical downlink control channel and to map the physical downlink channel to the second reference signal via a control channel element of the second physical downlink control channel.

20. The device of claim 11, wherein the transmitter is configured to transmit the respective first and the second reference signals from the respective first and second antennas with a channel quality indicator.

21. A memory embodying a program of instructions that when executed by a processor result in actions directed toward transmitting orthogonal signals, the actions comprising:

transmitting in a timeslot from a first antenna of a user equipment on a first physical uplink control channel using a first reference signal in a manner that multiplexes with other user equipments; and

transmitting in the timeslot from a second antenna of the user equipment on a second physical uplink control channel using a second reference signal in a manner that multiplexes with other user equipments,

wherein the first reference signal and the second reference signal comprises a cyclically shifted zero autocorrelation code and the second reference signal is orthogonal to the first reference signal by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals.

22. The memory of claim 21, the actions further comprising:

transmitting in the timeslot from a third antenna of the user equipment on a third physical uplink control channel using a third reference signal in a manner that multiplexes with other user equipment,

wherein the third reference signal channel comprises a cyclically shifted zero autocorrelation code and is orthogonal to both the first reference signal and the second reference signal by the said at least one of the cyclic shifts or a cover code applied to at least two of the first and the second and the third reference signals.

23. The memory of claim 21, wherein the first reference signal is cyclically shifted by a first cyclic shift and the second reference signal is cyclically shifted by a second cyclic shift, and wherein the first and the second cyclic shifts are orthogonal to one another.

24. The memory of claim 21, wherein the first and the second reference signals are orthogonal to one another at least by the cover code applied to at least one of them.

25. The memory of claim 21, wherein transmitting from the first antenna and transmitting from the second antenna comprises a same symbol multiplied by the respective first and second reference signals.

26. The memory of claim 21, wherein transmitting from the first antenna and transmitting from the second antenna comprises different symbols multiplied by the respective first and second reference signals.

27. The memory of claim 21, wherein transmitting from the first and from the second antennas comprises one of:

transmitting a scheduling request indicator;

or

transmitting an acknowledgement for data received in a persistently allocated downlink resource wherein at least the first reference signal maps to the persistently allocated downlink resource;

or

transmitting a negative acknowledgement for data not received according to a persistently allocated downlink resource wherein at least the first reference signal maps to the persistently allocated downlink resource.

28. The memory of claim 21, the actions further comprising, prior to the transmitting from the first or the second antennas, receiving data on at least one physical downlink channel and mapping the at least one physical downlink channel to at least the first physical uplink control channel, and wherein transmitting from the first and from the second antenna each comprises an acknowledgement for the case where the data is properly received or a negative acknowledgement for the case where the data is not properly received.

29. The memory of claim 28, wherein:

the at least one physical downlink channel is allocated to the user equipment dynamically on a physical downlink control channel, and

for the case where the at least one physical downlink channel is only one physical downlink channel, the user equipment maps the physical downlink channel to the first reference signal via a first control channel element of the one physical downlink control channel and maps the physical downlink channel to the second reference signal via a second control channel element of the one physical downlink control channel;

or

for the case where the at least one physical downlink channel is at least a first and a second physical downlink channel, the user equipment maps the physical downlink channel to the first reference signal via a control channel element of the first physical downlink control channel and maps the physical downlink channel to the second reference signal via a control channel element of the second physical downlink control channel.

30. A device comprising sending means, processing means and at least a first and a second radiating means,

wherein the sending means is for transmitting in a timeslot from the first radiating means on a first physical uplink control channel using a first reference signal in a manner that multiplexes with other devices, and

the sending means is further for transmitting in the timeslot from the second radiating means on a second physical uplink control channel using a second reference signal in a manner that multiplexes with other devices, wherein the first and the second reference signals comprise zero autocorrelation codes,

wherein the processing means is for cyclically shifting the first and the second reference signals and for rendering the first and the second reference signals orthogonal to one another by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals.

31. The device of claim 30, wherein the sending means comprises a transmitter, the processing means comprises a processor, and the first and the second radiating means comprises respective first and second transmit antennas.

32. A method comprising:

receiving in a timeslot on a first physical uplink control channel a first multiplexed signal from a first plurality of user equipments that includes a first reference signal;

receiving in the timeslot on a second physical uplink control channel a second multiplexed signal from a second plurality of user equipments that includes a second reference signal, wherein the first reference signal and the second reference signal comprises a cyclically shifted zero autocorrelation code and the second reference signal is orthogonal to the first reference signal by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals; and

mapping the first and the second reference signals to a first user equipment, said first user equipment being a member of both the first plurality and of the second plurality of user equipments.

33. The method of claim 32, further comprising:

allocating to the first user equipment a downlink resource allocation and sending data to the user equipment on the downlink resource allocation;

wherein the first and second reference signals are multiplied by one of an acknowledgement for the sent data or a negative acknowledgement for the sent data.

34. A device comprising a receiver and a processor,

wherein the receiver is configured to receive in a timeslot on a first physical uplink control channel a first multiplexed signal from a first plurality of user equipments that includes a first reference signal,

and the receiver is further configured to receive in the timeslot on a second physical uplink control channel a second multiplexed signal from a second plurality of user equipments that includes a second reference signal, wherein the first reference signal and the second reference signal comprises a cyclically shifted zero autocorrelation code and the second reference signal is orthogonal to the first reference signal by at least one of the cyclic shifts or a cover code applied to at least one of the first and the second reference signals;

and

the processor is configured to map the first and the second reference signals to a first user equipment, said first user equipment being a member of both the first plurality and of the second plurality of user equipments.

35. The device of claim 34, further comprising a transmitter configured to send a downlink resource allocation to the first user equipment and to send data to the user equipment on the downlink resource allocation;

wherein the first and second reference signals are multiplied by one of an acknowledgement for the sent data or a negative acknowledgement for the sent data.