WE CLAIM:
1. A method for reducing interference in a wireless communication system (100), the wireless
communication system comprising a first cell (110-a) and a second cell (120-a), wherein
uplink/downlink sub-frame configuration of the first cell (110-a) and the second cell (120-a)
is asymmetric and may result in implementing a first type of sub-frame at the first cell (110-
a) while implementing a second type of sub-frame different from the first type of sub-frame
at the second cell (120-a), thereby producing inter-cell interference, the method comprising:
mapping (410) a resource grid of at least one of the first type of sub-frame and the second type of sub-frame to reserve at least one of a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, and
a resource element in the second type of sub-frame corresponding to a resource element in the first type of sub-frame and mapped for at least one of a reference signal and a common control channel,
for not transmitting information; and
transmitting (420) a mapping result of the mapping step.
2. The method as claimed in claim 1, wherein the first type of sub-frame is a downlink sub-frame and the second type of sub-frame is an uplink sub-frame.
3. The method as claimed in claim 1, wherein the first type of sub-frame is a downlink sub-frame and the second type of sub-frame is a special sub-frame; and wherein only a resource grid of the first type of sub-frame is mapped to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.
4. The method as claimed in claim 2, wherein mapping (410) a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information, comprises:

mapping a resource grid of the first type of sub-frame to reserve at least one of the following resource elements in the first type of sub-frame, for not transmitting information:
a resource element corresponding to a resource element mapped for a Physical Uplink Control Channel PUCCH in the second type of sub-frame;
a resource element corresponding to a resource element mapped for an Uplink Pilot Channel UpPCH in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a channel Sounding Reference Signal SRS in the second type of sub-frame; and
a resource element corresponding to a resource element mapped for an Uplink Demodulation Reference Signal UL DMRS in the second type of sub-frame.
5. The method as claimed in claim 2, wherein mapping (410) a resource grid of the second
type of sub-frame to reserve a resource element in the second type of sub-frame
corresponding to a resource element in the first type of sub-frame and mapped for at least one
of a reference signal and a common control channel, for not transmitting information,
comprises:
mapping (410) a resource grid of the second type of sub-frame to reserve at least one of the following resource elements in the second type of sub-frame, for not transmitting information:
a resource element corresponding to a resource element mapped for a Physical Downlink Control Channel PDCCH in the first type of sub-frame;
a resource element corresponding to a resource element mapped for a Physical Broadcast Channel PBCH in the first type of sub-frame;
a resource element corresponding to a resource element mapped for a dynamic broadcast channel in the first type of sub-frame;
a resource element corresponding to a resource element mapped for a Channel State Information-Reference Signal CSI-RS in the first type of sub-frame;
a resource element corresponding to a resource element mapped for a Cell-Specific Reference Signal CRS in the first type of sub-frame;
a resource element corresponding to a resource element mapped for a Downlink Demodulation Reference Signal DL DMRS in the first type of sub-frame.
6. An apparatus (500) for reducing interference in a wireless communication system, the
wireless communication system comprising a first cell (110-a) and a second cell (120-a),

wherein uplink/downlink sub-frame configuration of the first cell (110-a) and the second cell (120-a) is asymmetric and may result in implementing a first type of sub-frame at the first cell (110-a) while implementing a second type of sub-frame different from the first type of sub-frame at the second cell (120-a), thereby producing inter-cell interference, the apparatus comprising:
a mapper (510) configured to map (410) a resource grid of at least one of the first type of sub-frame and the second type of sub-frame to reserve at least one of a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, and
a resource element in the second type of sub-frame corresponding to a resource element in the first type of sub-frame and mapped for at least one of a reference signal and a common control channel,
for not transmitting information; and
a transmitter (520) configured to transmit (420) a mapping result of the mapper.
7. A method for reducing interference in a wireless communication system, the wireless
communication system comprising a first cell (110-a) and a second cell (120-a), wherein
uplink/downlink sub-frame configuration of the first cell (110-a) and the second cell (120-a)
is asymmetric and may result in implementing a first type of sub-frame at the first cell (110-
a) while implementing a second type of sub-frame different from the first type of sub-frame
at the second cell (120-a), thereby producing inter-cell interference, the method comprising:
receiving (610) information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, mapping (620) the resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information; and mapping (620) the resource grid of the second type of sub-frame to reserve a resource element in the second type of sub-frame corresponding to a resource element in the first type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.
8. A base station (110, 120, 700) for reducing interference in a wireless communication
system (100), the wireless communication system (100) comprising a first cell (110-a) and a
second cell (120-a), wherein uplink/downlink sub-frame configuration of the first cell (110-a)

and the second cell (120-a) is asymmetric and may result in implementing a first type of sub-frame at the first cell (110-a) while implementing a second type of sub-frame different from the first type of sub-frame at the second cell (120-a), thereby producing inter-cell interference, the base station comprising:
a receiver (710) configured to receive (610) information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, a mapper (720) configured to map (620) a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information; and to map (620) a resource grid of the second type of sub-frame to reserve a resource element in the second type of sub-frame corresponding to a resource element in the first type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.
9. A method for reducing interference in a wireless communication system, the wireless
communication system comprising a first cell (110-a) and a second cell (120-a), wherein
uplink/downlink sub-frame configuration of the first cell (110-a) and the second cell (120-a)
is asymmetric and may result in implementing a first type of sub-frame at the first cell (110-
a) while implementing a second type of sub-frame different from the first type of sub-frame
at the second cell (120-a), thereby producing inter-cell interference, the method comprising:
receiving information related to mapping of a resource grid of the second type of sub-frame;
mapping a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.
10. The method as claimed in claim 9, wherein the first type of sub-frame is a downlink sub-
frame and the second type of sub-frame is an uplink sub-frame; and wherein mapping the
resource grid of the first type of sub-frame to reserve a resource element in the first type of
sub-frame corresponding to a resource element in the second type of sub-frame and mapped
for at least one of a reference signal and a common control channel, for not transmitting
information, comprises: mapping the resource grid of the first type of sub-frame to reserve at

least one of the following resource elements in the first type of sub-frame, for not transmitting information:
a resource element corresponding to a resource element mapped for a Physical Uplink Control Channel PUCCH in the second type of sub-frame;
a resource element corresponding to a resource element mapped for an Uplink Pilot Channel UpPCH in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a channel Sounding Reference Signal SRS in the second type of sub-frame; and a resource element corresponding to a resource element mapped for an Uplink Demodulation Reference Signal UL DMRS in the second type of sub-frame.
11. The method as claimed in claim 9, wherein the first type of sub-frame is an uplink sub-
frame and the second type of sub-frame is a downlink sub-frame; and wherein mapping the
resource grid of the first type of sub-frame to reserve a resource element in the first type of
sub-frame corresponding to a resource element in the second type of sub-frame and mapped
for at least one of a reference signal and a common control channel, for not transmitting
information, comprises: mapping the resource grid of the first type of sub-frame to reserve at
least one of the following resource elements in the first type of sub-frame, for not
transmitting information:
a resource element corresponding to a resource element mapped for a Physical Downlink Control Channel PDCCH in the second type of sub-frame; a resource element corresponding to a resource element mapped for a Physical Broadcast Channel PBCH in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a dynamic broadcast channel in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a Channel State Information-Reference Signal CSI-RS in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a Cell-Specific Reference Signal CRS in the second type of sub-frame;
a resource element corresponding to a resource element mapped for a Downlink Demodulation Reference Signal DL DMRS in the second type of sub-frame.
12. The method as claimed in claim 9, comprising:

transmitting information related to mapping of the resource grid of the first type of sub-frame.
13. A base station (110, 120, 700) for reducing interference in a wireless communication
system (100), the wireless communication system (100) comprising a first cell (110-a) and a
second cell (120-a), wherein uplink/downlink sub-frame configuration of the first cell (110-a)
and the second cell (120-a) is asymmetry and may result in implementing a first type of sub-
frame at the first cell (110-a) while implementing a second type of sub-frame different from
the first type of sub-frame at the second cell (120-a), thereby producing inter-cell
interference, the base station (110, 120, 700) comprising:
a receiver (710) configured to receive (610) information related to mapping of a resource grid of the second type of sub-frame;
a mapper (720) configured to map (620) a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.
14. The base station (110, 120, 700) as claimed in claim 13, comprising:
a transmitter (730) configured to transmit information related to mapping of a resource grid of the first type of sub-frame.
15. User equipment (130, 140) for reducing interference in a wireless communication system
(100), the wireless communication system (100) comprising a first cell and a second cell,
wherein uplink/downlink sub-frame configuration of the first cell and the second cell is
asymmetry and may result in implementing a first type of sub-frame at the first cell while
implementing a second type of sub-frame different from the first type of sub-frame at the
second cell, thereby producing inter-cell interference, the user equipment comprising:
a receiver configured to receive information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, wherein the resource grid of the first type of sub-frame is mapped as reserving a resource element in the first type of sub-frame corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information; and the resource grid of the second type of sub-frame is mapped as reserving a resource element in the second type of

sub-frame corresponding to a resource element in the first type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.