US 9,226,303 B2 · Method and arrangement for supporting radio resource management

Abstract

A method and apparatus in a base station serving a first cell in a cellular network, for supporting radio resource management, RRM, in the cellular network. The base station obtains measurements (M) of signals transmitted in the first cell and of signals transmitted in at least one neighboring cell and determines a cell isolation factor of the first cell, based on the obtained measurements, the cell isolation factor indicating insusceptibility to interference from signals transmitted in the neighboring cell(s). The determined cell isolation factor is then used to support RRM for terminals in the network, e.g. as a basis for determining whether to employ an RRM scheme or not. Thereby, it is possible to decide to employ the RRM scheme for cells where it is effective and helpful and not in other cells.

Claims22

Dependent claims

The method of determining a cell isolation factor is used as a basis for determining whether to employ a radio resource management scheme or not, said radio resource management scheme including one or more of:

exchanging with one or more base stations serving the at least one neighbouring cell, a High Interference Indicator, HII, referring to uplink resource allocations for cell edge terminals in the first cell,
exchanging with one or more base stations serving the at least one neighbouring cell, an Overload Indicator, OI, referring to uplink interference experienced in the first cell,
exchanging with one or more base stations serving the at least one neighbouring cell, a Relatively Narrow band Transmission Power Indicator, RNTPI, referring to restrictions in downlink power,
applying Fractional Frequency Reuse, FFR, for cell edge terminals in the first cell in coordination with a predetermined set of neighbouring cells,
applying Start Index or Random Start Index in coordination with a predetermined set of neighbouring cells,
applying Interference Rejection Combining, IRC, in the base station's receiver for suppressing interference, and
applying antenna tilt at the base station to reduce uplink interference.

4 more elements

The method of determining a base station serving a first cell in a cellular network, for supporting radio resource management in the cellular network, the method comprising:

obtaining measured values of signals transmitted in the first cell and measured values of signals transmitted in at least one neighbouring cell;
determining a cell isolation factor, CIF, of the first cell based on the obtained measured values, the cell isolation factor indicating insusceptibility to interference from signals transmitted in said at least one neighbouring cell and wherein said cell isolation factor, CIF, is determined as:
CIF=C(1)/ ΣC(n)
where C(1) is a representation of the obtained measured values of signals transmitted in the first cell, C(n) is a representation of the obtained measured values of signals transmitted in each of the at least one neighbouring cell, and N is the number of neighbouring cells considered;
and
using said cell isolation factor to support radio resource management for wireless terminals in the cellular network.

3 more elements

A method of determining a base station serving a first cell in a cellular network, for supporting radio resource management in the cellular network, the method comprising:

obtaining measured values of signals transmitted in the first cell and measured values of signals transmitted in at least one neighbouring cell,
determining a cell isolation factor, CIF(i), of the first cell based on the obtained measured values, the cell isolation factor indicating insusceptibility to interference from signals transmitted in said at least one neighbouring cell and the cell isolation factor CIF(j) of the first cell is determined in relation to a specific neighbouring cell j as:
=C(1)/C(j)
where C(1) is a representation of the obtained measured values of signals transmitted in the first cell, and C(j) is a representation of the obtained measured values of signals transmitted in the specific neighbouring cell j, and
using said cell isolation factor to support radio resource management for wireless terminals in the cellular network.

2 more elements

A base station serving a first cell in a cellular network and being configured to support radio resource management in the cellular network, the base station comprising:

an obtaining module adapted to obtain measured values of signals transmitted in the first cell and measured values of signals transmitted in at least one neighbouring cell,
a logic module adapted to determine a cell isolation factor, CIF, of the first cell based on the obtained measured values, the cell isolation factor indicating insusceptibility to interference from signals transmitted in said at least one neighbouring cell, and the logic module is further adapted to determine the cell isolation factor of the first cell in relation to a specific neighbouring cell j as:
CIF(j)=C(1)/C(j)
where C(1) is a representation of the obtained measured values of signals transmitted in the first cell, and C(j) is a the obtained representation of measured values of signals transmitted in the specific neighbouring cell j, and
a control module adapted to use said cell isolation factor to support radio resource management for wireless terminals in the cellular network.

2 more elements

Dependencies are inferred from the claim text.

Method and arrangement for supporting radio resource management

Life of this patent

Method and arrangement for supporting radio resource management

Life of this patent

Abstract

Claims22