公开(公告)号：US20020183084A1

公开(公告)日：2002-12-05

申请号：US10164063

申请日：2002-06-05

Applicant: Nortel Networks Limited

Inventor： Jianming Wu ,  Wen Tong ,  Daniel Boudreau

IPC: H04B007/00

CPC classification number: H04W72/1252 ,  H04L1/0002 ,  H04L47/14 ,  H04L47/24 ,  H04W72/1257

Abstract: The present invention provides different scheduling criteria depending on overall system performance in an effort to maintain fairness among mobile terminals and sustain a required QoS level. The invention is particularly effective for multi-carrier systems, wherein scheduling must also take into consideration the carrier used to transmit the scheduled data. In one embodiment, the present invention determines the spread of throughput rates for all mobile terminals being served by a given base station and bases the scheduling criteria thereon. Preferably, a standard deviation calculation is used to measure the throughput spread. The standard deviation of throughput associated with a collective group of mobile terminals is indicative of the differences between the lowest and highest throughputs with respect to the average throughput for the collective group of mobile terminals.

Abstract translation: 本发明提供了不同的调度标准，取决于整体系统性能，以保持移动终端之间的公平性并维持所需的QoS水平。 本发明对于多载波系统特别有效，其中调度还必须考虑用于发送调度数据的载波。 在一个实施例中，本发明确定由给定基站服务的所有移动终端的吞吐率的扩展，并且基于其上的调度准则。 优选地，使用标准差计算来测量吞吐量扩展。 与集体移动终端组相关联的吞吐量的标准偏差指示相对于集体移动终端的平均吞吐量的最低和最高吞吐量之间的差异。

公开(公告)号：US20040190640A1

公开(公告)日：2004-09-30

申请号：US10787700

申请日：2004-02-26

Applicant: NORTEL NETWORKS LIMITED

Inventor： Christian Dubuc ,  Colin Brown ,  Daniel Boudreau

IPC: H04K001/10

CPC classification number: H04L27/2608

Abstract: The present invention divides the available sub-carriers in an OFDM symbol window into N groups of sub-carriers wherein each group will be associated with sub-bands. In one embodiment, the sub-carriers in a group are spread throughout the range of sub-carriers to improve frequency diversity, and the sub-carriers assigned to any one group are separated by a constant offset. The sub-carriers in the group may be offset by an integer power of two. Within each group, sub-bands are defined using frequency hopping patterns among sub-carriers in the group from one OFDM symbol window to another. A pseudo-random pattern may be employed for sub-carrier mapping from one OFDM symbol window to the next to effectively distribute the sub-bands across the selected band of sub-carriers for the group.

Abstract translation: 本发明将OFDM符号窗口中的可用子载波划分为N组子载波，其中每个组将与子带相关联。 在一个实施例中，组中的子载波在整个子载波范围内扩展以改善频率分集，并且分配给任何一个组的副载波被分离一个恒定的偏移量。 组中的子载波可以被两个整数倍的偏移量。 在每个组内，使用从一个OFDM符号窗口到另一个OFDM符号窗口的组中的子载波之间的跳频模式来定义子带。 可以采用伪随机模式用于从一个OFDM符号窗口到下一个OFDM符号窗口的子载波映射，以有效地分布跨所选择的子载波频带的子带。