公开(公告)号：US20020058514A1

公开(公告)日：2002-05-16

申请号：US09939231

申请日：2001-08-24

Applicant: Nortel Networks Limited

Inventor： Nimal G. Senarath ,  Robert Matyas ,  Leo L. Strawczynski

IPC: H04Q007/20

CPC classification number: H04W16/28 ,  H04W16/24

Abstract: A method for reducing interference in a wireless system, and a system for performing the method. The wireless system should include at least two, and preferably four, beam formers and a plurality of mobile units. The method includes the steps of transmitting beams B1, B2, B3 and B4 into first, second, third and fourth beam areas, respectively. At least two sub-areas are defined within each of the first, second, third and fourth beam areas based upon the degree of overlap with adjacent beam areas, whereby each of the beam areas includes at least one overlapping sub-area and at least one non-overlapping sub-area. The method further includes coding signals of the beams B1, B2, B3 and B4 for receipt by a particular mobile unit based upon which one of the sub-areas that the particular mobile unit is located within. If the invention is practiced with a TDM scheme, at least three time periods are utilized, wherein during the first time period (T1), simultaneous transmissions are made for receipt by mobile units located within sub-areas G11, G12, G13 and G14; during a second time period (T2), transmissions are made for receipt by mobile units located within sub-areas G21 and G24; and during a third time period (T3), transmissions are made for receipt by mobile units located within sub-areas G22 and G23. If the invention is practiced with an FDM scheme, the group of frequencies assigned to each cell is divided such that half of the frequencies serve mobile units located within sub-areas G11, G12, G13 and G14, and the other half of the frequencies serve mobile units located within sub-areas G21, G22, G23 and G24.

Abstract translation: 一种用于减少无线系统中的干扰的方法，以及用于执行该方法的系统。 无线系统应包括至少两个，优选地四个波束形成器和多个移动单元。 该方法包括以下步骤：将光束B1，B2，B3和B4分别传输到第一，第二，第三和第四光束区域。 基于与相邻波束区域的重叠程度，至少两个子区域被定义在第一，第二，第三和第四波束区域的每一个内，由此每个波束区域包括至少一个重叠的子区域和至少一个 不重叠的子区域。 该方法还包括编码波束B1，B2，B3和B4的信号，以便由特定移动单元基于特定移动单元位于哪一个子区域内的哪个子区域进行接收。 如果以TDM方式实施本发明，则利用至少三个时间段，其中在第一时间段（T1）期间，同时进行发送以由位于子区域G11，G12，G13和G14内的移动单元接收; 在第二时间段（T2）期间，进行传输以由位于子区域G21和G24内的移动单元接收; 并且在第三时间段（T3）期间，发送用于位于子区域G22和G23内的移动单元的接收。 如果利用FDM方案实施本发明，则分配给每个小区的频率组被划分，使得一半频率服务于位于子区域G11，G12，G13和G14内的移动单元，并且另一半频率服务 位于子区域G21，G22，G23和G24内的移动单元。

公开(公告)号：US20030008654A9

公开(公告)日：2003-01-09

申请号：US09939231

申请日：2001-08-24

Applicant: Nortel Networks Limited

Inventor： Nimal G. Senarath ,  Robert Matyas ,  Leo L. Strawczynski

IPC: H04Q007/20

CPC classification number: H04W16/28 ,  H04W16/24

Abstract: A method for reducing interference in a wireless system, and a system for performing the method. The wireless system should include at least two, and preferably four, beam formers and a plurality of mobile units. The method includes the steps of transmitting beams B1, B2, B3 and B4 into first, second, third and fourth beam areas, respectively. At least two sub-areas are defined within each of the first, second, third and fourth beam areas based upon the degree of overlap with adjacent beam areas, whereby each of the beam areas includes at least one overlapping sub-area and at least one non-overlapping sub-area. The method further includes coding signals of the beams B1, B2, B3 and B4 for receipt by a particular mobile unit based upon which one of the sub-areas that the particular mobile unit is located within. If the invention is practiced with a TDM scheme, at least three time periods are utilized, wherein during the first time period (T1), simultaneous transmissions are made for receipt by mobile units located within sub-areas G11, G12, G13 and G14; during a second time period (T2), transmissions are made for receipt by mobile units located within sub-areas G21 and G24; and during a third time period (T3), transmissions are made for receipt by mobile units located within sub-areas G22 and G23. If the invention is practiced with an FDM scheme, the group of frequencies assigned to each cell is divided such that half of the frequencies serve mobile units located within sub-areas G11, G12, G13 and G14, and the other half of the frequencies serve mobile units located within sub-areas G21, G22, G23 and G24.