Handover signaling for beamforming communications

• US 9,455,775 B2
• Filed: 11/11/2014
• Issued: 09/27/2016
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Inventors: Dinan, Esmael Hejazi
• Primary Examiner(s): HOANG, THAI D
• Application Number:
  US14/538,355
• Publication Number:
  US 20150063314A1
• Time in Patent Office: 686 Days
• Field of Search: 370331-334, 455436-444
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/046 taking physical layer constraints into account
• CPC Class Codes: H04B 7/0473 taking constraints in layer or codeword to antenna mapping into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04J 11/0056 Inter-base station aspects
• CPC Class Codes: H04L 25/03955 in combination with downlink estimations, e.g. downlink path losses
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• 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
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0064 : of control information between different access points
• CPC Class Codes: H04W 36/0072 : of resource information of target access point
• CPC Class Codes: H04W 36/0094 : Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/085 : involving beams of access points
• CPC Class Codes: H04W 36/30 : by measured or perceived connection quality data
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/046 : the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/27 : between access points
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 74/002 : Transmission of channel access control information
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A first base station receives a first message comprising one or more parameters indicating whether a wireless device supports configuration of a number of channel state information (CSI) processes. The first base station transmits at least one second message comprising configuration parameters of CSI reference signals. The first base station transmits, to a second base station after making a handover decision, at least one third message comprising at least one of the one or more parameters and the configuration parameters of the CSI reference signals.

Claims

1. A first base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the first base station to;

receive, from a wireless device, a first message comprising one or more parameters indicating that the wireless device supports configuration of a first quantity of channel state information (CSI) processes for a carrier, the first quantity being greater than one;

transmit, to the wireless device, at least one second message comprising configuration parameters of a second quantity of CSI reference signals for the carrier and of a third quantity of CSI interference measurement resources for the carrier, wherein the second quantity and the third quantity are each less than or equal to the first quantity; and

transmit, to a second base station and in response to determining to perform a handover for the wireless device, at least one third message comprising at least one of;

the one or more parameters indicating that the wireless device supports the configuration of the first quantity of CSI processes;

or

the configuration parameters of the second quantity of CSI reference signals and of the third quantity of CSI interference measurement resources.

2. The first base station of claim 1, wherein the instructions, when executed by the one or more processors, further cause the first base station to

receive, from the wireless device, at least one measurement report subsequent to the transmission of the at least one second message,

wherein the at least one measurement report comprises signal quality information of at least one carrier of the second base station, and wherein the signal quality information is based at least in part on measurements of at least one orthogonal frequency-division multiplexing (OFDM) subcarrier.

3. The first base station of claim 2, wherein the instructions, when executed by the one or more processors, further cause the first base station to make the determination to perform the handover based at least in part on the at least one measurement report.

4. The first base station of claim 1, wherein the at least one second message is at least one of:

at least one encrypted message;

or

at least one message comprising an integrity header.

5. The first base station of claim 1, wherein the at least one second message further comprises configuration parameters of at least one physical channel, and wherein the at least one second message causes the wireless device to set up or modify at least one radio bearer.

6. The first base station of claim 1, wherein the at least one second message comprises at least one of:

a physical layer parameter, a media access control layer parameter, or a radio link control layer parameter.

7. The first base station of claim 1, wherein the at least one second message comprises uplink channel configuration parameters and handover parameters.

8. A method comprising:

receiving, by a first base station and from a wireless device, a first message comprising one or more parameters indicating that the wireless device supports configuration of a first quantity of channel state information (CSI) processes for a carrier, the first quantity being greater than one;

transmitting, to the wireless device, at least one second message comprising configuration parameters of a second quantity of CSI reference signals for the carrier and of a third quantity of CSI interference measurement resources for the carrier, wherein the second quantity and the third quantity are each less than or equal to the first quantity; and

transmitting, to a second base station and in response to determining to perform a handover for the wireless device, at least one third message comprising at least one of;

the one or more parameters indicating that the wireless device supports the configuration of the first quantity of CSI processes;

or

the configuration parameters of the second quantity of CSI reference signals and the third quantity of CSI interference measurement resources.

9. The method of claim 8, further comprising:

receiving, from the wireless device, at least one measurement report subsequent to the transmission of the at least one second message,

wherein the at least one measurement report comprises signal quality information of at least one carrier of the second base station, and wherein the signal quality information is based at least in part on measurements of at least one orthogonal frequency-division multiplexing (OFDM) subcarrier.

10. The method of claim 9, further comprising making the determination to perform the handover based at least in part on the at least one measurement report.

11. The method of claim 8, wherein the at least one second message is at least one of:

at least one encrypted message;

or

at least one message comprising an integrity header.

12. The method of claim 8, wherein the at least one second message further comprises configuration parameters of at least one physical channel, and wherein the at least one second message causes the wireless device to set up or modify at least one radio bearer.

13. A first base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the first base station to;

receive, from a wireless device, a first message comprising one or more parameters indicating that the wireless device supports configuration of a first quantity of channel state information (CSI) processes for a carrier, the first quantity being greater than one;

transmit, to the wireless device, at least one second message comprising configuration parameters of a second quantity of CSI reference signals for the carrier, the second quantity being less than or equal to the first quantity; and

transmit, to a second base station and in response to determining to perform a handover for the wireless device, at least one third message comprising at least one of;

the one or more parameters indicating that the wireless device supports the configuration of the first quantity of CSI processes;

or

the configuration parameters of the second quantity of CSI reference signals.

14. The first base station of claim 13, wherein the instructions, when executed by the one or more processors, further cause the first base station to

receive, from the wireless device, at least one measurement report subsequent to the transmission of the at least one second message,

wherein the at least one measurement report comprises signal quality information of at least one carrier of the second base station, and wherein the signal quality information is based at least in part on measurements of at least one orthogonal frequency-division multiplexing (OFDM) subcarrier.

15. The first base station of claim 14, wherein the instructions, when executed by the one or more processors, further cause the first base station to make the determination to perform the handover based at least in part on the at least one measurement report.

16. The first base station of claim 13, wherein the at least one second message is at least one of:

at least one encrypted message;

or

at least one message comprising an integrity header.

17. The first base station of claim 13, wherein the at least one second message further comprises configuration parameters of at least one physical channel, and wherein the at least one second message causes the wireless device to set up or modify at least one radio bearer.

18. The first base station of claim 13, wherein the at least one second message comprises at least one of:

a physical layer parameter, a media access control layer parameter, or a radio link control layer parameter.

19. The first base station of claim 13, wherein the at least one second message comprises uplink channel configuration parameters and handover parameters.

20. The first base station of claim 13, wherein the at least one second message comprises radio resource configuration parameters comprising a physical channel configuration parameter.

21. A method comprising:

receiving, by a first base station and from a wireless device, a first message comprising one or more parameters indicating that the wireless device supports configuration of a first quantity of channel state information (CSI) processes for a carrier, the first quantity being greater than one;

transmitting, to the wireless device, at least one second message comprising configuration parameters of a second quantity of CSI reference signals for the carrier, the second quantity being less than or equal to the first quantity; and

transmitting, to a second base station and in response to determining to perform a handover for the wireless device, at least one third message comprising at least one of;

the one or more parameters indicating that the wireless device supports the configuration of the first quantity of CSI processes;

or

the configuration parameters of the second quantity of CSI reference signals.

22. The method of claim 21, further comprising:

receiving, from the wireless device, at least one measurement report subsequent to the transmission of the at least one second message,

wherein the at least one measurement report comprises signal quality information of at least one carrier of the second base station, and wherein the signal quality information is based at least in part on measurements of at least one orthogonal frequency-division multiplexing (OFDM) subcarrier.

23. The method of claim 22, further comprising making the determination to perform the handover based at least in part on the at least one measurement report.

24. The method of claim 21, wherein the at least one second message is at least one of:

at least one encrypted message;

or

at least one message comprising an integrity header.

25. The method of claim 21, wherein the at least one second message further comprises configuration parameters of at least one physical channel, and wherein the at least one second message causes the wireless device to set up or modify at least one radio bearer.

26. The method of claim 21, wherein the at least one second message comprises at least one of:

a physical layer parameter, a media access control layer parameter, or a radio link control layer parameter.

27. The method of claim 21, wherein the at least one second message comprises uplink channel configuration parameters and handover parameters.

28. The method of claim 21, wherein the at least one second message comprises radio resource configuration parameters comprising a physical channel configuration parameter.