# US 2013/0156008 A1 · Handover Signaling for Beamforming Communications

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- Number: US 2013/0156008 A1
- Document ID: US20130156008A1
- Status: Published application
- Kind: A1
- Application number: 13/720,906
- Filed: 2012-12-19
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Ofinno Technologies, LLC
- Inventors: Esmael Hejazi Dinan
- Web page: https://patentgrep.com/patent/US20130156008A1

## CPC

- H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports}
- H04B 7/0417: Feedback systems
- H04B 7/043: {using best eigenmode, e.g. beam forming or beam steering}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/046: {taking physical layer constraints into account}
- H04B 7/0473: {taking constraints in layer or codeword to antenna mapping into account}
- H04B 7/0478: {Special codebook structures directed to feedback optimisation}
- H04B 7/0481: {using subset selection of codebooks}
- H04B 7/0617: {for beam forming}
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection}
- H04B 7/0634: {Antenna weights or vector/matrix coefficients}
- H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection}
- H04J 11/0056: {Inter-base station aspects}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- H04L 25/03955: {in combination with downlink estimations, e.g. downlink path losses}
- H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length}
- H04W 24/02: Arrangements for optimising operational condition
- H04W 28/0236: {radio quality, e.g. interference, losses or delay}
- H04W 36/0064: {of control information between different access points}
- H04W 36/0072: {of resource information of target access point}
- H04W 36/0094: {Definition of hand-off measurement parameters}
- H04W 36/085: {involving beams of access points}
- H04W 36/30: by measured or perceived connection quality data
- H04W 72/044: based on the type of the allocated resource
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/046: {the resource being in the space domain, e.g. beams}
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/27: between access points
- H04W 72/541: using the level of interference
- H04W 74/002: {Transmission of channel access control information}
- H04W 88/08: Access point devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A serving base station transmits a message to one or more target base station in response to a handover decision for a wireless device supporting beamforming and multiple carrier configurations. The message includes a plurality of measurement configuration parameters for the wireless device. The serving base station receives a response from at least one of the target base stations. The serving base station transmits a handover command to the wireless device subsequent to receiving the response message.

## Claims

### Claim 1

A method comprising:
a) receiving, by a serving base station, a first message from a wireless device on a carrier, said first message comprising one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:
i) a maximum of k channel state information reference signals for said carrier, k being an integer greater than one; and
ii) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one;
b) transmitting, by said serving base station to said wireless device, at least one second message, at least some parameters in said at least one second message depend at least in part on said first message, said at least one second message:
i) comprising:
(1) one or more channel state information reference signals parameters;
(2) one or more channel state information interference measurement resources parameters; and
(3) a plurality of measurement parameters;
ii) configured to cause:
(1) configuration of j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and
(2) configuration of m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n; and
(3) said wireless device measuring signal quality of at least one carrier of one or more target base stations in response to said measurement parameters;
c) receiving, by said serving base station, at least one measurement report from said wireless device in response to said at least one second message, said at least one measurement report comprising signal quality information of at least one carrier said at least one carrier of at least one of said one or more target base stations, said signal quality information derived at least in part employing measurements of at least one OFDM subcarrier;
d) making a handover decision, by said serving base station, based at least in part on said at least one measurement report;
e) transmitting, by said serving base station, in response to said serving base station making a handover decision for said wireless device, at least one third message to at least one target base station, said at least one third message comprising:
i) said one or more parameters implicitly or explicitly indicating whether said wireless device supports said configuration of:
(1) said maximum of k channel state information reference signals; and
(2) said maximum of n channel state information interference measurement resources;
ii) configuration parameters of:
(1) said j channel state information reference signals for said carrier; and
(2) said m channel state information interference measurement resources for said carrier.

### Claim 2 (depends on 1)

The method of claim 1, before said at least one second message is transmitted, further comprising:
a) encrypting said at least one second message; and
a) protecting said at least one second message by an integrity header.

### Claim 3 (depends on 1)

The method of claim 1, wherein said at least one second message:
a) further includes configuration information for physical channels for said wireless device; and
b) is configured to cause said wireless device to set up or modify at least one radio bearer.

### Claim 4 (depends on 1)

The method of claim 1, wherein one of said at least one second message is configured to cause said wireless device to configure at least one of a physical layer parameter, a media access control layer parameter and a radio link control layer parameter.

### Claim 5 (depends on 1)

The method of claim 1, wherein one of said at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.

### Claim 6 (depends on 1)

The method of claim 1, wherein one of said at least one second message comprises radio resource configuration parameters comprising a physical channel configuration parameters.

### Claim 7 (depends on 1)

The method of claim 1, further comprising said serving base station transmitting a demodulation reference signal on said carrier.

### Claim 8

A method comprising:
a) receiving, by a serving base station, a first message from a wireless device on a carrier, said first message comprising one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:
i) a maximum of k channel state information reference signals for said carrier, k being an integer greater than one; and
ii) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one;
b) transmitting, by said serving base station to said wireless device, at least one second message, at least some parameters in said at least one second message depend at least in part on said first message, said at least one second message configured to cause configuration of:
i) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and
ii) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n; and
c) transmitting, by said serving base station, in response to said serving base station making a handover decision for said wireless device, at least one third message to at least one target base station, said at least one third message comprising at least one of:
i) said one or more parameters implicitly or explicitly indicating whether said wireless device supports said configuration of:
(1) said maximum of k channel state information reference signals; and
(2) said maximum of n channel state information interference measurement resources;
ii) configuration parameters of:
(1) said j channel state information reference signals for said carrier; and
(2) said m channel state information interference measurement resources for said carrier.

### Claim 9 (depends on 8)

The method of claim 8, wherein said at least one second message comprises said configuration parameters of:
a) said j channel state information reference signals for said carrier; and
a) said m channel state information interference measurement resources for said carrier.

### Claim 10 (depends on 8)

The method of claim 8, wherein said at least one second message:
a) comprises a plurality of measurement parameters; and
b) is configured to cause said wireless device measuring signal quality of at least one carrier of one or more target base stations in response to said measurement parameters.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
a) receiving, by said serving base station, at least one measurement report from said wireless device in response to said at least one second message, said at least one measurement report comprising signal quality information of at least one carrier of said at least one carrier of at least one of said one or more target base stations, said signal quality information derived at least in part employing measurements of at least one OFDM subcarrier;
b) making a handover decision, by said serving base station, based at least in part on said at least one measurement report.

### Claim 12 (depends on 11)

The method of claim 11, wherein a format of said at least one measurement report is determined employing at least one of said at least one second control message.

### Claim 13 (depends on 8)

The method of claim 8, wherein said at least one second message:
a) comprises an identifier for each carrier in a plurality of carriers; and
b) configured to cause configuration of:
i) said plurality of carriers in said wireless device;
ii) one or more channel state information reference signals for one or more carriers in said plurality of carriers; and
iii) one or more channel state information interference measurement resources for one or more carriers in said plurality of carriers.

### Claim 14 (depends on 8)

The method of claim 8, wherein one of said at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.

### Claim 15 (depends on 8)

The method of claim 8, wherein one of said at least one second message comprises at least one radio resource configuration parameter comprising at least one physical channel configuration parameter.

### Claim 16

A serving base station, configured to communicate employing at least one backward compatible carrier and at least one non-backward compatible carrier, comprising:
a) one or more communication interfaces;
b) one or more processors; and
c) memory storing instructions that, when executed, cause said serving base station to:
i) receive a first message from a wireless device on a carrier, said first message comprising one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:
(1) a maximum of k channel state information reference signals for said carrier, k being an integer greater than one; and
(2) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one;
ii) transmit to said wireless device, at least one second message, at least some parameters in said at least one second message depend at least in part on said first message, said at least one second message configured to cause configuration of:
(1) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and
(2) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n; and
iii) transmit in response to said serving base station making a handover decision for said wireless device, at least one third message to at least one target base station, said at least one third message comprising at least one of:
(1) said one or more parameters implicitly or explicitly indicating whether said wireless device supports said configuration of:
(a) said maximum of k channel state information reference signals; and
(b) said maximum of n channel state information interference measurement resources;
(2) configuration parameters of:
(a) said j channel state information reference signals for said carrier; and
(b) said m channel state information interference measurement resources for said carrier.

### Claim 17 (depends on 16)

The serving base station of claim 16, wherein said instructions, when executed, further causes said serving base station, before said at least one second message is transmitted, to:
a) encrypt said at least one second message; and
b) protect said at least one second message by an integrity header.

### Claim 18 (depends on 16)

The serving base station of claim 16, wherein said at least one second message:
a) further includes configuration information for physical channels for said wireless device; and
b) configured to cause said wireless device to set up or modify at least one radio bearer.

### Claim 19 (depends on 16)

The serving base station of claim 16, wherein one of said at least one second message configured to cause said wireless device to configure at least one of a physical layer parameter, a media access control layer parameter and a radio link control layer parameter.

### Claim 20 (depends on 16)

The serving base station of claim 16, wherein one of said at least one second message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.