Frequency offset measurement enhancements for long term evolution (LTE)

• US 9,332,469 B2
• Filed: 10/10/2013
• Issued: 05/03/2016
• Est. Priority Date: 11/01/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Davydov, Alexei Vladimirovich, Morozov, Gregory Vladimirovich, Han, Seunghee, Maltsev, Alexander Alexandrovich, Bolotin, Ilya, Sergeyev, Vadim Sergeyevich, Fwu, Jong-Kae
• Primary Examiner(s): Hoang, Thai
• Application Number:
  US14/125,767
• Publication Number:
  US 20150029874A1
• Time in Patent Office: 936 Days
• Field of Search: 370342-345
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 3/0614 the synchronising signal being characterised by the amplitude, duration or polarity
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 2101/375 Access point names [APN]
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 61/3005 Mechanisms for avoiding name conflicts
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04W 16/20 for indoor coverage or short range network deployment
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0268 : using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 28/04 : Error control
• CPC Class Codes: H04W 28/24 : Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 36/14 : Reselecting a network or an air interface
• CPC Class Codes: H04W 36/20 : for optimising the interference level
• CPC Class Codes: H04W 4/70 : Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0235 : where the received signal is a power saving command
• CPC Class Codes: H04W 60/04 : using triggered events
• CPC Class Codes: H04W 64/003 : locating network equipment
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 : based on quality criteria
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 72/563 : of the wireless resources
• CPC Class Codes: H04W 74/0858 : collision detection
• CPC Class Codes: H04W 76/14 : Direct-mode setup
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 8/005 : Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: H04W 88/16 : Gateway arrangements
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

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.

Claims

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.

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.

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.

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;

provide 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

provide, 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 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.

21. The node of claim 20, wherein the first reference signal comprises a demodulation reference signal and the second reference signal comprises one selected from a positioning reference signal and a first channel state information reference signal, wherein the processor is further arranged to provide one or more third reference signals co-located with the second reference signal, the second reference signal and the one or more third reference signals being separated by one or more inter-OFDM symbol separations, and wherein the one or more third reference signals comprises one or more second channel state information reference signals.

22. The node of claim 21, wherein the one or more third reference signals comprises 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.

23. The node of claim 21, wherein the processor receives a 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.

24. A user equipment (UE) for providing frequency offset measurement enhancements, comprising:

a transceiver arranged to receive and transmit signals; and

a processor, coupled to the transceiver, the processor arranged to receive;

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-boated with the first reference signal; and

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.

25. The user equipment of claim 24, 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.

26. The user equipment of claim 24, wherein the processor is further arranged to receive one or more third reference signals co-located with the second reference signal, the one or more third reference signals separated by one or more inter-OFDM symbol separations between the received second reference signal and the received one or more third reference signals.

27. The user equipment of claim 26, wherein the one or more third reference signals comprises 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.

28. The user equipment of claim 26, wherein the first reference signal comprises a demodulation reference signal, the second reference signal comprises a first channel state information reference signal and wherein the one or more third reference signals comprise one or more second channel state information reference signals.

29. The user equipment of claim 26, wherein the processor is further arranged to estimate a carrier frequency offset based on calculations using the co-located first reference signal and at least one of the second reference signal and the one or more third reference signals.