Frequency offset measurement enhancements for long term evolution (LTE)

Patent metadata

Field	Value
Publication number	US-9332469-B2
Application number	US-201314125767-A
Country	US
Kind code	B2
Filing date	Oct 10, 2013
Priority date	Nov 1, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Embodiments for providing frequency offset measurement enhancements are generally described herein. In some embodiments, user equipment is informed of a configuration of a first reference signal and a configuration of a second reference signal. The first reference signal is provided to user equipment for performing channel estimation. A second reference signal for estimating carrier frequency offset is provided, wherein the second reference signal is co-located with the first reference signal. A carrier frequency offset estimation is calculated based on the co-located first and second reference signals.

First claim

What is claimed is:

1. A method for providing frequency offset measurement enhancements, comprising:
providing co-location information to user equipment to inform the user equipment of a configuration of a first reference signal and a configuration of a second reference signal co-located with the first reference signal; and
providing, to the user equipment, the first reference signal and the second reference signal co-located with the first reference signal for measuring carrier frequency offset by the user,
wherein the second reference signal is co-located with the first reference signal in the same sub-carrier in a frequency domain, and the second reference signal is co-located adjacent with the first reference signal in a time domain.

2. The method of claim 1 , wherein the first reference signal is arranged to identify a data transmission for determining an associated carrier frequency offset and the second reference signal is arranged for measuring the carrier frequency offset of the data transmission identified by the first reference signal.

3. The method of claim 1 , wherein the providing the first reference signal comprises providing a user equipment-specific reference signal and the providing the second reference signal comprises providing a positioning reference signal or a second reference signal mutable to prevent interference from other eNBs.

4. The method of claim 3 , wherein the providing the user equipment-specific reference signal comprises providing a demodulation reference signal.

5. The method of claim 1 , wherein the providing the co-location information comprises one selected from:
using radio resource control signaling to indicate co-location of a channel state information reference signal and a positioning reference signal;
providing an indication of co-location of the channel state information reference signal and a demodulation reference signal; and
providing an indication of co-location of the positioning reference signal and a demodulation reference signal.

6. The method of claim 1 further comprising providing one or more third reference signals co-located with the second reference signal, wherein the providing the second reference signal and providing the one or more third reference signals comprises providing one or more inter-OFDM symbol separations between the second reference signal and the one or more third reference signals.

7. The method of claim 6 , wherein the providing the one or more third reference signals comprises one selected from:
providing two or more third reference signals and wherein the providing the one or more inter-OFDM symbol separations comprises providing two or more different inter-OFDM symbol separations; and
providing one or more copies of the second reference signal.

8. The method of claim 6 , wherein the providing the second reference signal and the providing the one or more third references signals comprises mapping the second reference signal and the one or more third reference signals in a physical resource block to one subcarrier.

9. The method of claim 6 , wherein the providing the first reference signal, the second reference signal and the one or more third reference signals comprises providing a demodulation reference signal, a first channel state information reference signal and one or more second channel state information reference signals.

10. The method of claim 6 further comprising receiving carrier frequency offset estimation from the user equipment based on the co-located first reference signal and at least one of the second reference signal and the one or more e third reference signals.

11. A method for providing frequency offset measurement enhancements, comprising:
receiving at user equipment co-location information to inform the user equipment of a configuration of a first reference signal and a configuration of a second reference signal co-located with the first reference signal; and
receiving the first reference signal and the second reference signal co-located with the first reference signal for measuring carrier frequency offset by the user equipment,
wherein the second reference signal is co-located with the first reference signal in the same sub-carrier in a frequency domain, and the second reference signal is co-located adjacent with the first reference signal in a time domain.

12. The method of claim 11 , wherein the first reference signal is arranged to identify a data transmission for determining an associated carrier frequency offset and the second reference signal is arranged for measuring the carrier frequency offset of the data transmission identified by the first reference signal.

13. The method of claim 11 , wherein the receiving the first reference signal comprises receiving a user equipment-specific reference signal and the receiving the second reference signal comprises one selected from:
receiving a positioning reference signal;
receiving a second reference signal mutable to prevent interference from other eNBs; and
receiving a physical resource block having the second reference signal.

14. The method of claim 11 , wherein the receiving the co-location information comprises one selected from:
receiving radio resource control signaling to indicate co-location of a channel state information reference signal and a positioning reference signal;
receiving an indication of co-location of the channel state information reference signal and a demodulation reference signal; and
receiving an indication of co-location of the positioning reference signal and a demodulation reference signal.

15. The method of claim 11 further comprising receiving one or more third reference signals co-located with the second reference signal, wherein the receiving the second reference signal and receiving the one or more third reference signals comprises receiving the second reference signal and the one or more third reference signals with one or more inter-OFDM symbol separations between the second reference signal and the one or more third reference signals.

16. The method of claim 15 , wherein the receiving the one or more third reference signals comprises one selected from:
receiving two or more third reference signals and wherein the one or more inter-OFDM symbol separations comprises two or more different inter-OFDM symbol separations;
receiving one or more copies of the second reference signal; and receiving one or more third reference signals mapped to one subcarrier.

17. The method of dam 11 , wherein the receiving the first reference signal, the second reference signal and the one or more third reference signals comprises receiving a demodulation reference signal, a first channel state information reference signal and one or more second channel state information reference signals.

18. The method of claim 11 , wherein the receiving the second reference signal comprises receiving the second reference signal configured as a channel state information reference signal transmitted from one antenna with no code division multiplexing to the second reference signal.

19. The method of claim 11 further comprising transmitting carrier frequency offset estimation from the user equipment based on the co-located first reference signal and at least one of the second reference signal and the one or more third reference signals.

20. A node for providing frequency offset measurement enhancements, comprising:
a transceiver for receiving and transmitting signals; and
a processor, coupled to the transceiver, the processor arranged to:
prov

Assignees

• Davydov Alexei Vladimirovich
• Morozov Gregory Vladimirovich
• Han Seunghee
• Maltsev Alexander Alexandrovich
• Bolotin Ilya
• Sergeyev Vadim Sergeyevich
• Fwu Jong-Kae
• Intel Corp

Inventors

• Davydov Alexei Vladimirovich
• Morozov Gregory Vladimirovich
• Han Seunghee
• Maltsev Alexander Alexandrovich
• Bolotin Ilya
• Sergeyev Vadim Sergeyevich
• Fwu Jong-Kae

Classifications

• H04W72/54

  based on quality criteria · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/563

  of the wireless resources · CPC title