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31. 发明授权

US06967936B1 Uplink timing synchronization and access control for a multi-access wireless communication system 有权
标题翻译：用于多址无线通信系统的上行链路定时同步和访问控制
公开(公告)号：US06967936B1
公开(公告)日：2005-11-22
申请号：US09503040
申请日：2000-02-11
申请人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Sathyadev Venkata Uppala
IPC分类号： H04J11/00 , H04B7/26 , H04L5/02 , H04L7/00 , H04L27/26 , H04Q7/00
CPC分类号： H04W56/0005 , H04J3/0682 , H04L5/023
摘要： Improved timing synchronization and access control techniques for use in an orthogonal frequency division multiplexed (OFDM) wireless system or other type of wireless communication system. In accordance with the invention, an uplink synchronization and access control system is provided in which mobile stations transmit certain timing and access signals in dedicated intervals in an uplink stream. Access control is illustratively implemented as a two-stage process in which a given mobile first transmits a generic uplink access signal in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment containing initial timing and power corrections, along with initial channel assignments on which the mobile can initiate a call set-up process. For re-synchronization, mobiles transmit timing synchronization signals in the dedicated timing and access intervals. The base station measures the arrival time of the signals, and sends back appropriate timing corrections. The invention thereby ensures that orthogonality between mobiles is maintained.
摘要翻译：用于正交频分复用（OFDM）无线系统或其他类型的无线通信系统中的改进的定时同步和接入控制技术。根据本发明，提供一种上行链路同步和接入控制系统，其中移动台在上行链路流中以专用间隔发送某些定时和接入信号。访问控制被示意性地实现为两阶段过程，其中给定移动单元首先在其中一个间隔中发送通用上行链路接入信号。如果该接入被接受，则基站发送包含初始定时和功率校正的接入确认以及移动台可以在其上启动呼叫建立过程的初始信道分配。为了重新同步，移动台以专用定时和接入间隔发送定时同步信号。基站测量信号的到达时间，并发回适当的时序校正。因此，本发明确保了移动台之间的正交性得以维持。

32. 发明授权

US06823191B2 Apparatus and method for use in paging mode in wireless communications systems 有权
标题翻译：在无线通信系统中用于寻呼模式的装置和方法
公开(公告)号：US06823191B2
公开(公告)日：2004-11-23
申请号：US09756384
申请日：2001-01-08
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04Q720
CPC分类号： H04W68/02 , H04W68/00
摘要： Latency in receiving and detecting paging messages at a wireless terminal is reduced by employing a unique “super” paging time slot format. A paging super time slot includes a plurality of prescribed time slots. Each wireless terminal is associated with cyclically recurring super time slots. A super slot is associated with one or more wireless terminals. A base station always selects the first available time slot in a super time slot to transmit a paging message to a wireless terminal that is associated with the super time slot. Each wireless terminal monitors every time slot in the associated super time slot until either detecting reception of its associated paging message or detecting an empty time slot. In another embodiment of the invention, a unique partially overlapping super time slot format is employed in which a super time slot has at least one time slot common to its adjacent super time slots. This allows wireless terminals associated with adjacent super time slots to share the common at least one time slot. In turn, this results in balanced traffic loads, smoothed traffic fluctuation and reduced congestion.
摘要翻译：通过采用独特的“超级”寻呼时隙格式，减少了无线终端接收和检测寻呼消息的延迟。寻呼超时隙包括多个规定的时隙。每个无线终端与循环重复的超时隙相关联。超级时隙与一个或多个无线终端相关联。基站始终选择超时隙中的第一可用时隙，以将寻呼消息发送到与超时隙相关联的无线终端。每个无线终端监视相关超时隙中的每个时隙，直到检测到其相关联的寻呼消息的接收或检测到空时隙。在本发明的另一个实施例中，采用了唯一的部分重叠的超时隙格式，其中超时隙具有与其相邻超时隙共同的至少一个时隙。这允许与相邻超时隙相关联的无线终端共享共同的至少一个时隙。反过来，这导致平衡的流量负载，平滑的流量波动和减少的拥塞。

33. 发明授权

US08862160B2 Method and apparatus for paging terminals in an OFDM system for achieving both fast paging response and low power consumption by utilizing a multi-step paging process 有权
标题翻译： OFDM系统中寻呼终端的方法和装置，通过利用多步寻呼过程实现快速寻呼响应和低功耗
公开(公告)号：US08862160B2
公开(公告)日：2014-10-14
申请号：US11487118
申请日：2006-07-14
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04W68/00 , H04W68/02
CPC分类号： H04W68/025 , H04W68/00 , H04W68/02 , Y02D70/00
摘要： Techniques for paging terminals in a wireless (e.g., OFDMA) communication system to achieve both fast paging response and low power consumption for the terminals are described. A terminal receives paging indicator from a base station. If the paging indicator indicates that the terminal is potentially being paged, then the terminal receives at least one paging message from a paging channel. The terminal determines whether any one of the at least one paging message is for the terminal e.g., based on identification information included in each paging message. If a paging message indicates that the terminal is paged, then the terminal sends an acknowledgement for the paging message. The base station may estimate the timing of the terminal based on the acknowledgement and may send timing adjustment to the terminal. The terminal may adjust its timing based on the timing adjustment and may be able to quickly access the system with no contention.
摘要翻译：描述了在无线（例如，OFDMA）通信系统中的寻呼终端的技术，以实现终端的快速寻呼响应和低功耗。终端从基站接收寻呼指示符。如果寻呼指示符指示终端可能被寻呼，则终端从寻呼信道接收至少一个寻呼消息。终端基于每个寻呼消息中包含的识别信息来确定至少一个寻呼消息中的任何一个是否针对终端。如果寻呼消息指示终端被寻呼，则终端发送寻呼消息的确认。基站可以基于确认来估计终端的定时，并且可以向终端发送定时调整。终端可以基于定时调整来调整其定时，并且可以能够在没有争用的情况下快速地访问系统。

34. 发明授权

US08457054B2 Apparatus and method for use in paging mode in wireless communications systems 有权
公开(公告)号：US08457054B2
公开(公告)日：2013-06-04
申请号：US10895720
申请日：2004-07-21
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04W72/04 , H04W68/02 , H04J3/16 , H04J12/43
CPC分类号： H04W68/02 , H04W68/00
摘要： Latency in receiving and detecting paging messages at a wireless terminal is reduced by employing a unique “super” paging time slot format. A paging super time slot includes a plurality of prescribed time slots. Each wireless terminal is associated with cyclically recurring super time slots. A super slot is associated with one or more wireless terminals. A base station always selects the first available time slot in a super time slot to transmit a paging message to a wireless terminal that is associated with the super time slot. Each wireless terminal monitors every time slot in the associated super time slot until either detecting reception of its associated paging message or detecting an empty time slot. In another embodiment of the invention, a unique partially overlapping super time slot format is employed in which a super time slot has at least one time slot common to its adjacent super time slots. This allows wireless terminals associated with adjacent super time slots to share the common at least one time slot. In turn, this results in balanced traffic loads, smoothed traffic fluctuation and reduced congestion.

35. 发明授权

US08374613B2 Method of creating and utilizing diversity in a multiple carrier communication system 有权
标题翻译：在多载波通信系统中创建和利用分集的方法
公开(公告)号：US08374613B2
公开(公告)日：2013-02-12
申请号：US12060249
申请日：2008-03-31
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04W36/00
CPC分类号： H04W36/20 , H04W16/12 , H04W16/14 , H04W24/00 , H04W36/06 , H04W52/0235 , H04W52/08 , H04W52/281 , H04W52/283 , H04W52/286 , H04W52/287 , H04W52/288 , H04W52/60 , H04W56/00 , H04W68/02 , H04W68/025 , H04W72/00 , H04W72/048 , Y02D70/00
摘要： In many cellular systems, reusing spectrum bandwidth, creates problems in boundary regions between the cells and sectors where the signal strength received from adjacent base stations or adjacent sector transmissions of a single base station may be nearly equivalent. The invention creates a new type of diversity, referred to as multiple carrier diversity by utilizing multiple carriers, assigning different power levels to each carrier frequency at each base station, and/or offsetting sector antennas. The cell and/or sector coverage areas can be set so as to minimize or eliminate overlap between cell and/or sector boundary regions of different carrier frequencies. Mobile nodes traveling throughout the system can exploit multiple carrier diversity by detecting carriers and selecting to use a non-boundary carrier based on other system criteria in order to improve performance. Boundary carriers may, but need not be, identified and excluded from consideration for use by a wireless terminal.
摘要翻译：在许多蜂窝系统中，重用频谱带宽在小区和扇区之间的边界区域中产生问题，其中从相邻基站接收的信号强度或单个基站的相邻扇区传输可能几乎相等。本发明通过利用多个载波，在每个基站上为每个载波频率分配不同的功率电平和/或补偿扇区天线来创建一种称为多载波分集的新型分集。可以设置小区和/或扇区覆盖区域以便最小化或消除不同载波频率的小区和/或扇区边界区域之间的重叠。在整个系统中传播的移动节点可以通过检测载波并且基于其他系统标准选择使用非边界载波来利用多载波分集，以便提高性能。边界运营商可以但不需要被识别并排除在考虑无线终端的使用之外。

36. 发明申请

US20130016678A1 SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM 有权
公开(公告)号：US20130016678A1
公开(公告)日：2013-01-17
申请号：US13619460
申请日：2012-09-14
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04W72/04
CPC分类号： H04L5/0007 , H04L5/023 , H04L27/2602 , H04L27/2614 , H04L27/2636
摘要： A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

37. 发明申请

US20110235747A1 SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM 有权
公开(公告)号：US20110235747A1
公开(公告)日：2011-09-29
申请号：US13158215
申请日：2011-06-10
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04L27/00
CPC分类号： H04L5/0007 , H04L5/023 , H04L27/2602 , H04L27/2614 , H04L27/2636
摘要： A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

38. 发明授权

US07924699B2 Signaling method in an OFDM multiple access system 有权
公开(公告)号：US07924699B2
公开(公告)日：2011-04-12
申请号：US12759630
申请日：2010-04-13
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04J11/00 , H04B7/216
CPC分类号： H04L5/0007 , H04L5/023 , H04L27/2602 , H04L27/2614 , H04L27/2636
摘要： A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

39. 发明申请

US20100195484A1 SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM 有权
公开(公告)号：US20100195484A1
公开(公告)日：2010-08-05
申请号：US12759639
申请日：2010-04-13
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04J11/00 , H04L27/28
CPC分类号： H04L5/0007 , H04L5/023 , H04L27/2602 , H04L27/2614 , H04L27/2636
摘要： A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

40. 发明申请

US20080013490A1 Methods and apparatus related to assignment in a wireless communications system 有权
公开(公告)号：US20080013490A1
公开(公告)日：2008-01-17
申请号：US11487053
申请日：2006-07-14
申请人： Rajiv Laroia , Vladimir Parizhisky , Junyi Li , Sathyadev Venkata Uppala
发明人： Rajiv Laroia , Vladimir Parizhisky , Junyi Li , Sathyadev Venkata Uppala
IPC分类号： H04Q7/00
CPC分类号： H04W72/042 , H04W8/26
摘要： Methods and apparatus related to assignment in a wireless communications system are described. A mobile is assigned an identifier and a mask value, e.g., as part of a state transition message. The mobile uses the assigned identifier and/or the assigned mask value in determining whether assignments included in assignment messages, e.g., traffic channel assignment messages, are directed to the wireless terminal. Predetermined associations between assignment slots, assigned segments, and/or mask values are utilized to limit control signaling overhead. Different groups of segments are available for assignment to different wireless terminals as a function of mask values. Different types of assignment messages use different amounts of information bits to convey the assignment. Some types of assignments use a wireless terminal identifier, while other types of assignments use a wireless terminal identifier and a mask identifier. The mask identifier, e.g., a single bit, allows for selection between a subset of the potential masks used in the system.

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