# US 2013/0156009 A1 · Beamforming Handover Messaging in a Wireless Network

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- Number: US 2013/0156009 A1
- Document ID: US20130156009A1
- Status: Published application
- Kind: A1
- Application number: 13/720,920
- 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/US20130156009A1

## 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) transmitting, by a serving base station, in response to said serving base station making a handover decision for a wireless device, at least one first message to at least one target base station, said at least one first message comprising:
i) 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 a 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; and
ii) configuration parameters 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;
b) receiving, by said serving base station, at least one second message from one of said at least one target base station, said at least one second message comprising configuration parameters of:
i) p channel state information reference signals for said carrier, p being an integer smaller than or equal to k; and
ii) q channel state information interference measurement resources for said carrier, q being an integer smaller than or equal to n; and
c) transmitting, by said serving base station, in response to receiving said at least one second message, a third message to said wireless device, said third message comprising said configuration parameters of:
i) said p channel state information reference signals; and
ii) said q channel state information interference measurement resources.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

The method of claim 1, wherein said third 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 said third 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 an radio link control layer parameter.

### Claim 5 (depends on 1)

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

### Claim 7 (depends on 1)

The method of claim 1, further comprising said one of said at least one target base station transmitting a plurality of channel state information reference signals on said carrier.

### Claim 8 (depends on 1)

The method of claim 1, further comprising said one of said at least one target base station transmitting a plurality of a demodulation reference signals on said carrier.

### Claim 9 (depends on 1)

The method of claim 1, said third message further comprising configuration parameters of a plurality of carriers.

### Claim 10

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

### Claim 11 (depends on 10)

The serving base station of claim 10, wherein said instructions, when executed, further causes said serving base station, before said third message is transmitted, to:
a) encrypt said third message; and
b) protect said third message by an integrity header.

### Claim 12 (depends on 10)

The serving base station of claim 10, wherein said third 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 13 (depends on 10)

The serving base station of claim 10, wherein said third message causes said wireless device to configure at least one of a physical layer parameter, a media access control layer parameter and an radio link control layer parameter.

### Claim 14 (depends on 10)

The serving base station of claim 10, wherein said third message comprises radio link configuration information comprising uplink channel configuration parameters and handover parameters.

### Claim 15 (depends on 10)

The serving base station of claim 10, wherein said third message comprises radio resource configuration parameters comprising one or more physical channel configuration parameters.

### Claim 16

A cellular network comprising:
a) a serving base station configured to communicate with at least one target base station; and
b) said at least one target base station; and
wherein:
i) said serving base station transmits in response to making a handover decision for a wireless device, at least one first message to said at least one target base station, said at least one first message comprising at least one of:
(1) one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of:
(a) a maximum of k channel state information reference signals for a carrier, k being an integer greater than one; and
(b) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one; and
(2) configuration parameters of:
(a) j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and
(b) m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n;
ii) said serving base station receives at least one second message from one of said at least one target base station, said at least one second message comprising configuration parameters of:
(1) p channel state information reference signals for said carrier, p being an integer smaller than or equal to k; and
(2) q channel state information interference measurement resources for said carrier, q being an integer smaller than or equal to n; and
iii) said serving base transmits in response to receiving said at least one second message, a third message to said wireless device, said third message comprising said configuration parameters of:
(1) said p channel state information reference signals; and
(2) said q channel state information interference measurement resources.

### Claim 17 (depends on 16)

The cellular network of claim 16, wherein said third message comprises radio resource configuration parameters comprising one or more physical channel configuration parameters.

### Claim 18 (depends on 16)

The cellular network of claim 16, wherein said one of said at least one target base station transmits a channel state information reference signal on:
a) said at least one non-backward compatible carrier; and
b) said at least one backward compatible carrier.

### Claim 19 (depends on 16)

The cellular network of claim 16, wherein said one of said at least one target base station transmits a demodulation reference signal on:
a) said at least one non-backward compatible carrier; and
b) said at least one backward compatible carrier.

### Claim 20 (depends on 16)

The cellular network of claim 16, wherein said third message further comprises:
a) said information identifying a carrier type for each of said plurality of carriers; and
b) said information associating each of said non-backward compatible carrier in said plurality of carriers with one backward compatible carrier in said plurality of carriers.