| US 7,545,732 B2 | ||
| Apparatus and method for assigning sub-carriers in an orthogonal frequency division multiplex system | ||
| Hyun-Seok Oh, Incheon (Korea, Republic of); Sung-Jin Kim, Suwon-si (Korea, Republic of); Yong-Suk Moon, Suwon-si (Korea, Republic of); Young-Seok Lim, Seoul (Korea, Republic of); Hyun-Seok Yu, Seoul (Korea, Republic of); Gin-Kyu Choi, Seoul (Korea, Republic of); and Hye-Jeong Lee, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwon-si (Korea, Republic of) | ||
| Filed on Aug. 19, 2004, as Appl. No. 10/921,149. | ||
| Claims priority of application No. 10-2003-0058426 (KR), filed on Aug. 22, 2003. | ||
| Prior Publication US 2007/0140102 A1, Jun. 21, 2007 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—206 [370/208; 370/332; 370/348] | 9 Claims |
| 1. A method in a Node B for transmitting data to a user equipment (UE) in an orthogonal frequency division multiplex (OFDM)
system that transmits data through at least one transmit antenna, for data transmission, the method comprising the steps of:
receiving channel condition information about each of sub-carrier groups for each transmit antenna of the Node B from the
UE;
preferentially selecting sub-carrier groups for the UE, which are to be used for transmission of the data based on the channel
condition information and preferentially selecting a transmit antenna for transmission of the data in a descending order of
channel conditions based on the channel condition information; and
transmitting the data, information about the selected sub-carrier groups, through the selected transmit antenna,
wherein the sub-carrier groups for transmission of the data comprise adjacent sub-carriers, the channel condition information
is a ranked preset value representing channel conditions of sub-carriers of the sub-carrier groups, and each of the sub-carrier
groups has more sub-carriers in a case of a frequency flat fading channel; wherein the selecting step further comprises the
step of:
assigning the sub-carrier group to the UE according to quality of service and the type of a service requested by the UE if
the Node B receives channel condition information about the sub-carrier groups from at least two UEs; and
further comprising the step of:
selecting a transmit antenna for the UE according to the channel condition information about the sub-carrier groups if at
least two transmit antennas are used.
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