# US 2019/0357067 A1 · Multi-Cell Signals in OFDM Wireless Networks

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- Number: US 2019/0357067 A1
- Document ID: US20190357067A1
- Status: Published application
- Kind: A1
- Application number: 16/421,135
- Filed: 2019-05-23
- Published: 2019-11-21
- Earliest claimed: 2011-09-23
- Assignees: Comcast Cable Communications, LLC
- Applicants: Comcast Cable Communications, LLC
- Inventors: Esmael Hejazi Dinan
- Web page: https://patentgrep.com/patent/US20190357067A1

## CPC

- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/0634: {Antenna weights or vector/matrix coefficients}
- H04B 7/066: {Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]}
- H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- 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 wireless device receives messages indicating CSI measurement resources related to transmission points. For example, the CSI measurement resources may be for cells belonging to at least two base stations or belonging to at least two sectors of a base station. The wireless device measures CSI employing at least CSI measurement resources of the cells. The wireless device quantizes the measured CSI jointly across cells and encodes and transmits the jointly quantized CSI. The wireless device receives a resource assignment for data packet(s). The wireless device receives signals carrying the data packets from multiple cells.

## Claims

### Claim 1

A method for use in a wireless device, the method comprising:
receiving, via a first cell of a first transmission point of a first base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a subset of cells, wherein the subset of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
measuring, based on the CSI measurement resources, CSI for the subset of cells;
quantizing the measured CSI jointly across cells of the subset of cells;
transmitting, to the first base station, the jointly quantized CSI;
receiving, via the first transmission point of the first base station, at least one resource assignment for at least one packet; and
receiving signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.

### Claim 2 (depends on 1)

The method of claim 1, wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the subset of cells.

### Claim 3 (depends on 1)

The method of claim 1, wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.

### Claim 4 (depends on 1)

The method of claim 1, wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.

### Claim 5 (depends on 4)

The method of claim 4, wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.

### Claim 6 (depends on 1)

The method of claim 1, wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).

### Claim 7 (depends on 1)

The method of claim 1, wherein the at least one resource assignment is received from the first base station on one serving cell of the subset of cells.

### Claim 8 (depends on 7)

The method of claim 7, wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the subset of cells.

### Claim 9 (depends on 1)

The method of claim 1, wherein the second transmission point is associated with the first base station.

### Claim 10 (depends on 1)

The method of claim 1, wherein the second transmission point is associated with a second base station.

### Claim 11 (depends on 1)

The method of claim 1, wherein the first transmission point comprises a plurality of cells.

### Claim 12 (depends on 1)

The method of claim 1, wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.

### Claim 13 (depends on 1)

The method of claim 1, wherein the first transmission point is geographically separated from the second transmission point.

### Claim 14

A method for use in a first base station, the method comprising:
transmitting, to a wireless device and via a first cell of a first transmission point of the first base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a subset of cells, wherein the subset of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
receiving and decoding jointly quantized CSI, wherein CSI is measured based on the CSI measurement resources for the subset of cells, and the measured CSI is quantized jointly across cells of the subset of cells to generate the jointly quantized CSI;
transmitting, to the wireless device and via the first transmission point, at least one resource assignment for at least one packet; and
transmitting, via the first cell of the first transmission point, first signals to the wireless device, wherein the first signals correspond to the at least one packet, and wherein second signals corresponding to the at least one packet are transmitted via the at least one second cell of the second transmission point.

### Claim 15 (depends on 14)

The method of claim 14, wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the subset of cells.

### Claim 16 (depends on 14)

The method of claim 14, wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.

### Claim 17 (depends on 14)

The method of claim 14, wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.

### Claim 18 (depends on 17)

The method of claim 17, wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.

### Claim 19 (depends on 14)

The method of claim 14, wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).

### Claim 20 (depends on 14)

The method of claim 14, wherein the at least one resource assignment is transmitted by the first base station on one serving cell of the subset of cells.

### Claim 21 (depends on 14)

The method of claim 14, wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the subset of cells.

### Claim 22 (depends on 14)

The method of claim 14 wherein the second transmission point is associated with the first base station.

### Claim 23 (depends on 14)

The method of claim 14, wherein the second transmission point is associated with a second base station.

### Claim 24 (depends on 14)

The method of claim 14, wherein the first transmission point comprises a plurality of cells.

### Claim 25 (depends on 14)

The method of claim 14, wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.

### Claim 26 (depends on 14)

The method of claim 14, wherein the first transmission point is geographically separated from the second transmission point.

### Claim 27

A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, via a first cell of a first transmission point of a first base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a subset of cells, wherein the subset of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
measure, based on the CSI measurement resources, CSI for the subset of cells;
quantize the measured CSI jointly across cells of the subset of cells;
transmit, to the first base station, the jointly quantized CSI;
receive, via the first transmission point of the first base station, at least one resource assignment for at least one packet; and
receive signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.

### Claim 28 (depends on 27)

The wireless device of claim 27, wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the subset of cells.

### Claim 29 (depends on 27)

The wireless device of claim 27, wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.

### Claim 30 (depends on 27)

The wireless device of claim 27, wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.

### Claim 31 (depends on 30)

The wireless device of claim 30, wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.

### Claim 32 (depends on 27)

The wireless device of claim 27, wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).

### Claim 33 (depends on 27)

The wireless device of claim 27, wherein the at least one resource assignment is received from the first base station on one serving cell of the subset of cells.

### Claim 34 (depends on 27)

The wireless device of claim 27, wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the subset of cells.

### Claim 35 (depends on 27)

The wireless device of claim 27, wherein the second transmission point is associated with the first base station.

### Claim 36 (depends on 27)

The wireless device of claim 27, wherein the second transmission point is associated with a second base station.

### Claim 37 (depends on 27)

The wireless device of claim 27, wherein the first transmission point comprises a plurality of cells.

### Claim 38 (depends on 27)

The wireless device of claim 27, wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.

### Claim 39 (depends on 27)

The wireless device of claim 27, wherein the first transmission point is geographically separated from the second transmission point.

### Claim 40

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:
transmit, to a wireless device and via a first cell of a first transmission point of the first base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a subset of cells, wherein the subset of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
receive and decode jointly quantized CSI, wherein CSI is measured based on the CSI measurement resources for the subset of cells, and the measured CSI is quantized jointly across cells of the subset of cells to generate the jointly quantized CSI;
transmit, to the wireless device and via the first transmission point, at least one resource assignment for at least one packet; and
transmit, via the first cell of the first transmission point, first signals to the wireless device, wherein the signals correspond to the at least one packet, and wherein second signals corresponding to the at least one packet are transmitted via the at least one second cell of the second transmission point.

### Claim 41 (depends on 40)

The first base station of claim 40, wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the subset of cells.

### Claim 42 (depends on 40)

The first base station of claim 40, wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.

### Claim 43 (depends on 40)

The first base station of claim 40, wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.

### Claim 44 (depends on 43)

The first base station of claim 43, wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.

### Claim 45 (depends on 40)

The first base station of claim 40, wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).

### Claim 46 (depends on 40)

The first base station of claim 40, wherein the at least one resource assignment is transmitted by the first base station on one serving cell of the subset of cells.

### Claim 47 (depends on 40)

The first base station of claim 40, wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the subset of cells.

### Claim 48 (depends on 40)

The first base station of claim 40, wherein the second transmission point is associated with the first base station.

### Claim 49 (depends on 40)

The first base station of claim 40, wherein the second transmission point is associated with a second base station.