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    ITERATIVE PRECODER MATRIX COMPUTATION METHOD AND APPARATUS
    11.
    发明公开
    ITERATIVE PRECODER MATRIX COMPUTATION METHOD AND APPARATUS 有权
    方法和设备VORKODIERUNGSMATRIX的迭代计算

    公开(公告)号：EP2484071A2

    公开(公告)日：2012-08-08

    申请号：EP10776815.2

    申请日：2010-09-28

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： HUI, Dennis ,  ZANGI, Kambiz

    IPC分类号： H04L25/03 ,  H04L25/02

    CPC分类号： H04L25/03343 ,  H04B7/024 ,  H04B7/0617 ,  H04L5/0035 ,  H04L25/0204

    摘要： Precoder weights employed at a base station which coordinates with other base stations to form a super-cell are determined by (a) determining an initial downlink preceding matrix at the base station for a mobile station serviced by the base station in the super-cell, (b) revising a downlink receiver matrix associated with the mobile station based on the initial downlink precoding matrix; (c) transforming the downlink receiver matrix to an uplink precoder matrix associated with the mobile station, (d) revising an uplink receiver matrix associated with each base station in uplink communication with the mobile station based on the uplink precoder matrix associated with the mobile station, and (e) revising the initial downlink preceding matrix by transforming the uplink receiver matrix to a revised downlink precoding matrix Steps (b), (c), (d) and (e) are repeated for a pellicular number of iterations to determine a final downlink preceding matrix for the mobile station.

    PRECODING WITH REDUCED FEEDBACK FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK
    12.
    发明公开
    PRECODING WITH REDUCED FEEDBACK FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK 有权
    WITH REDUCED反馈预编码协作多点传输的向下ROUTE

    公开(公告)号：EP2377281A2

    公开(公告)日：2011-10-19

    申请号：EP09798954.5

    申请日：2009-12-09

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： ZANGI, Kambiz

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03343 ,  H04L25/0206 ,  H04L2025/03426

    摘要： Techniques for reducing the number of bits needed to specify the best precoding vector for each mobile station in a wireless communication network that employs multi-point transmission are disclosed. An exemplary method begins with the estimation of path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna. Based on the estimated path losses, one of a plurality of pre-determined subsets (codebooks) of a pre-determined set of antenna precoding vectors is selected. A group index identifying the selected subset is then transmitted to the mobile station. Subsequently, a vector index is received from the mobile station, the vector index corresponding to a precoding vector in the selected subset, and data is transmitted to the mobile station, using the precoding vector applied to the transmitter antennas at the plurality of transmitter sites.

    DISTRIBUTED ANTENNA SYSTEM
    13.
    发明公开
    DISTRIBUTED ANTENNA SYSTEM 审中-公开
    分布式天线系统

    公开(公告)号：EP2204051A1

    公开(公告)日：2010-07-07

    申请号：EP07844718.2

    申请日：2007-10-30

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： GUEY, Jiann-ching ,  ZANGI, Kambiz

    IPC分类号： H04W4/00

    CPC分类号： H04W36/18 ,  H04W16/04 ,  H04W16/32 ,  H04W36/04

    摘要： A wireless communication network employs a distributed antenna system to provide radio coverage. The wireless communication network comprises a plurality of access points providing service in respective coverage areas. The access point within each coverage area connects to a plurality of antennas that are widely distributed within the coverage area. Radio resources at antennas within the overlapping region of two or more neighboring coverage areas are shared by the access points in the neighboring coverage areas according to a multiple access scheme. The sharing of radio resources within the overlapping region of two or more coverage areas allows the overlapping region to be enlarged, thereby providing more time to complete a handover.

    DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK
    15.
    发明公开
    DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK 审中-公开
    协调一致的下行链路多点的传输VORKODIERUNGSGEWICHTEN的分布式计算

    公开(公告)号：EP2792082A2

    公开(公告)日：2014-10-22

    申请号：EP12823007.5

    申请日：2012-12-17

    申请人： Telefonaktiebolaget LM Ericsson (PUBL)

    发明人： HUI, Dennis ,  ZANGI, Kambiz

    IPC分类号： H04B7/02 ,  H04B7/04 ,  H04W52/34 ,  H04W52/36

    CPC分类号： H04B7/024 ,  H04B7/0465 ,  H04W52/346 ,  H04W52/365

    摘要： In a Coordinated Multi-point (CoMP) system, the base station (BS) in each serving cell (or sector) is allowed to use not only its own antennas, but also the antennas of neighboring BSs to transmit to mobile terminals in the serving cell to form a floating CoMP cell. The serving BS in each floating CoMP cell computes tentative linear precoding weights for transmissions from the coordinating BSs in the floating CoMP cell to users in the serving cell of the floating CoMP cell. The serving BS determines the power availability for transmit antennas in the floating CoMP cell that are shared with other floating CoMP cells, and scales the tentative precoding weights based on the power availability of the shared transmit antennas to determine final precoding weights so that the power constraints of the shared transmit antennas will not be violated.

    EXTENDED COORDINATED MULTIPOINT CELLS TO MITIGATE INTER-COMP-CELL DOWNLINK INTERFERENCE
    17.
    发明公开
    EXTENDED COORDINATED MULTIPOINT CELLS TO MITIGATE INTER-COMP-CELL DOWNLINK INTERFERENCE 有权
    扩展协作多点细胞减少之间的CoMP小区DOWN范围问题

    公开(公告)号：EP2430872A1

    公开(公告)日：2012-03-21

    申请号：EP10726583.7

    申请日：2010-05-13

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： ZANGI, Kambiz ,  GUEY, Jiann-Ching ,  HUI, Dennis

    IPC分类号： H04W72/12

    CPC分类号： H04W72/1231 ,  H04B7/024 ,  H04L5/0066 ,  H04L5/0091

    摘要： Inter-CoMP cell interference is reduced by "extending" at least one CoMP cell to include UEs served by a neighboring CoMP ceil in the extended CoMP cell's transmission calculations, so as to minimize interference to the UEs served by other CoMP ceils. Each UE in a border sub-cell identifies neighboring CoMP cells from which it receives interference in excess of a threshold value, and includes the interfering CoMP cells in a close-neighbor set. The close-neighbor set is transmitted to the UE's serving CoMP cell controller. When downlink transmissions are scheduled to the target UE, the controller notifies the neighboring CoMP cells in the close-neighbor set, identifying the target UE, Those CoM P cells then use information about the channel conditions from their transmit antennas to the target UE receive antennas to compute transmissions to UEs they serve, with the constraint that interference to the target UE is below a predetermined level.

    HYBRID CONTENTION-BASED AND SCHEDULE-BASED ACCESS TO A COMMUNICATION LINK
    19.
    发明公开
    HYBRID CONTENTION-BASED AND SCHEDULE-BASED ACCESS TO A COMMUNICATION LINK 有权
    冲突和规划基于混合接入的通信链路

    公开(公告)号：EP2201813A1

    公开(公告)日：2010-06-30

    申请号：EP08794183.7

    申请日：2008-09-09

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： ZANGI, Kambiz ,  GUEY, Jiann-Ching

    IPC分类号： H04W74/08

    CPC分类号： H04W74/0841 ,  H04W74/02

    摘要： One or more embodiments taught herein provide a hybrid access arrangement using a contention-based channel (40) and a scheduled channel (42) on a communication link (16). As a point of significant efficiency, given users (18) transmit autonomously on the contention-based channel (40), without need for scheduling overhead. However, if a contention overload occurs on the contention-based channel (40), the involved users are identified from unique signature sequences included in their user transmissions. The identified users are temporarily managed as scheduled users on the scheduled channel (42), which supplements the contention-based channel (40) and therefore may use limited communication link resources in comparison to the contention-based channel (40). Users not involved in the contention overload generally continue operating on the contention-based channel (40).