# US 2010/0136989 A1 · Method and Radio Base Station for Effective Spectrum Utilization

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- Number: US 2010/0136989 A1
- Document ID: US20100136989A1
- Status: Published application
- Kind: A1
- Application number: 12/522,514
- Filed: 2007-01-15
- Published: 2010-06-03
- Earliest claimed: 2007-01-15
- Assignees: Telefonaktiebolaget L M Ericsson (publ)
- Inventors: Erik Westerberg; Andreas Olsson; Stefan Parkvall; Tobias Tynderfeldt; Hannes Ekström
- Web page: https://patentgrep.com/patent/US20100136989A1

## CPC

- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 16/16: for PBS [Private Base Station] arrangements
- H04W 48/12: using downlink control channel
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention relates to radio communication in a cellular network and in particular to the sharing of a frequency spectrum with another network. The object is to enable robust communication in the shared band. The solution is to allocate a third band for communication in a cell. A L1/L2 control channel may be transmitted in the third band only, whereas data can be transmitted in the shared band. The L1/L2 control channel support the data communication in the shared band. The invention relates to a method and a radio base station.

## Claims

### Claim at position 1

-15. (canceled)

### Claim 16

A method of utilizing a frequency spectrum, comprising:
allocating a third zone of the frequency spectrum to a first radio base station in a first cellular network for serving radio communication in a first cell;
informing the first radio base station of a second zone of the frequency spectrum that is available to a various extent over time for radio communication in the first cell; and
defining a physical structure for a layer 1/layer 2 (L1/L2) control channel only within the third zone only for use by the first radio base station in the first cell.

### Claim 17 (depends on 16)

The method of claim 16, wherein the extent to which the second frequency band is available for the first cell depends on interference caused by a second radio base station transmission.

### Claim 18 (depends on 17)

The method of claim 17, wherein the second radio base station is included in a broadcast network.

### Claim 19 (depends on 17)

The method of claim 17, wherein the second radio base station belongs to a second cellular radio network.

### Claim 20 (depends on 19)

The method of claim 19, wherein the first cellular network uses orthogonal frequency division multiplex for radio communication and the second cellular radio network is a GSM network.

### Claim 21 (depends on 16)

The method of claim 16, wherein the L1/L2 control channel supports data communication in the second zone.

### Claim 22 (depends on 21)

The method of claim 21, wherein the L1/L2 control channel is periodically occurring.

### Claim 23 (depends on 21)

The method of claim 21, wherein the L1/L2 control channel is a scheduling-related control channel.

### Claim 24 (depends on 23)

The method of claim 23, wherein the scheduling-related control channel carries scheduling commands relating to the second zone frequencies.

### Claim 25 (depends on 21)

The method of claim 21, wherein the first cellular network is a packet-switched network.

### Claim 26 (depends on 16)

The method of claim 16, wherein the second frequency zone and the third frequency zone are not contiguous.

### Claim 27

A method for a first radio base station serving a first cell with radio communication, comprising:
being allocated a third zone of a frequency spectrum for communication in the first cell;
receiving information on a second zone of the frequency spectrum that is available to a various extent over time for communication in the first cell; and
transmitting a layer 1/layer 2 (L1/L2) control channel in the first cell on a physical structure which uses only the third zone of the frequency spectrum.

### Claim 28 (depends on 27)

The method of claim 27, further comprising:
measuring interference in the second zone; and
scheduling data traffic in the second zone at frequencies and times with low measured interference.

### Claim 29 (depends on 27)

The method of claim 27, further comprising:
being informed of the extent to which the second zone is available over time; and
scheduling data traffic in the second zone at frequencies and times that are included in the available extent of the second zone.

### Claim 30 (depends on 27)

A radio base station, wherein the radio base station is adapted to perform the method of claim 27.