US 8,804,549 B2 · Method and apparatus for transmitting dedicated reference signal

Abstract

A method and apparatus for transmitting a dedicated reference signal (DRS) are provided, the method including determining, by a base station, whether user equipments (UEs) participating in multiple users-multiple input multiple output (MU-MIMO) at the same physical resource block (PRB) belong to the same cell, if yes, configuring that the UEs adopt a cell-specific scrambling code sequence; otherwise, configuring that the UEs located in the cells belonging to the same cell group adopt a cell group-specific scrambling code sequence; sending, by the base station, configuration information to the UE, and sending a DRS to the UE by using the scrambling code sequence configured for the UE; an initialization code of the cell-specific scrambling code sequence is determined according to an identity of the cell in which the UE is located; an initialization code of the cell group-specific scrambling code sequence is determined according to an identity of the cell group. As such, the UE can restrain DRS interferences between different cells when receiving the DRS and improve the precision of the channel estimation.

Claims15

Dependent claims

A method for transmitting a dedicated reference signal (DRS), comprising:

determining, by a base station, whether user equipments (UEs) participating in multiple users-multiple input multiple output (MU-MIMO) at the same physical resource block (PRB) belong to the same cell, if yes, configuring that the UEs adopt a cell-specific scrambling code sequence;
otherwise, configuring that the UEs located in the cells belonging to the same cell group adopt a cell group-specific scrambling code sequence;
sending, by the base station, configuration information to each of the UEs, and sending a DRS to each of the UEs by using the scrambling code sequence configured for each of the UEs;
wherein an initialization code of the cell-specific scrambling code sequence is determined according to an identity of the cell in which each of the UEs are located;
an initialization code of the cell group-specific scrambling code sequence is determined according to an identity of the cell group.

2 more elements

An apparatus for transmitting a dedicated reference signal (DRS), comprising;

a memory;
and
a processor comprising a type determining unit, a type configuring unit and a sending processing unit;
wherein:
the type determining unit is adapted to determine whether UEs participating in MU-MIMO at the same PRB belong to the same cell;
the type configuring unit is adapted to configure that the UEs adopt a cell-specific scrambling code sequence when a determining result of the type determining unit is yes;
configure that the UEs located in the cells belonging to the same cell group adopt a cell group-specific scrambling code sequence when the determining result of the type determining unit is no;
the sending processing unit is adapted to send configuration information of the type configuring unit to each of the UEs, and send a DRS to each of the UEs by using the scrambling code sequence configured for each of the UEs;
and
an initialization code of the cell-specific scrambling code sequence is determined according to an identity of the cell in which each of the UEs are located;
an initialization code of the cell group-specific scrambling code sequence is determined according to an identity of the cell group.

8 more elements

Dependencies are inferred from the claim text.

Method and apparatus for transmitting dedicated reference signal

Life of this patent

Method and apparatus for transmitting dedicated reference signal

Life of this patent

Abstract

Claims15