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1.发明授权Methods and apparatus for transmitting and receiving data over a communications network in the presence of interference 有权在存在干扰的情况下通过通信网络发送和接收数据的方法和装置公开(公告)号：US07177371B1
公开(公告)日：2007-02-13
申请号：US10131911
申请日：2002-04-25
CPC分类号： H04L1/0034 , H04L1/0009 , H04L1/18 , H04L1/1819 , H04L1/1893 , H04L27/3488 , H04L2001/0098
摘要： It is becoming increasingly important to improve data throughput in wireless networks. By transmitting data simultaneously at different modulation amplitudes and/or using different code strengths, terminals having different carrier to noise ratios are able to decode the different amplitude levels with varying degrees of success. This allows distant terminals to receive low data rate transmissions at high modulation levels or code rates while nearer terminals can use additional capacity in the transmission by receiving lower level modulation signals or code rates. In this way, distant terminals do not degrade overall network performance. By arranging for terminals to acknowledge receipt of data, retransmission at different modulation levels or code rates may be carried out by the base station in order to improve performance in the presence of noise without a priori knowledge of the carrier to noise ratio for a particular terminal.
摘要翻译： 提高无线网络中的数据吞吐量正变得越来越重要。 通过以不同的调制幅度和/或使用不同的代码强度同时发送数据，具有不同载波与噪声比的终端能够以不同程度的成功解码不同的幅度电平。 这允许远端终端以高调制级别或码率接收低数据速率传输，而较近的终端可以通过接收较低级别的调制信号或码率来在传输中使用额外的容量。 这样，远端终端不会降低整体网络性能。 通过安排终端来确认数据的接收，基站可以执行不同调制级别或代码率的重传，以便在没有对特定终端的载波噪声比的先验知识的情况下改善噪声存在的性能 。
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公开(公告)号：US07289427B2
公开(公告)日：2007-10-30
申请号：US11515840
申请日：2006-09-06
IPC分类号： H04J11/00
CPC分类号： H04L1/1812 , H04L1/1845 , H04L1/1867 , H04L27/2602
摘要： A method and apparatus are provided for error correction in a communication system employing Orthogonal Frequency Division Multiplexing. When a remote unit receives an OFDM symbol, a retransmission indicator bit is examined to determine whether the symbol is an original symbol or a retransmitted symbol. If it is a retransmitted symbol and the remote unit has a corresponding symbol stored in memory, then the received symbol is soft-combined with the stored symbol. Each packet in the symbol, either the received symbol if original or the soft-combined symbol if retransmitted, is examined by the remote unit. If the remote unit determines that a particular packet is intended for the remote unit, but can not determine the contents of the payload of the packet, the remote unit sends a retransmission request to the base station for retransmission of the symbol. The base station determines whether the entire symbol or merely the packet should be retransmitted, based on such considerations as the size of the packet or whether there are additional requests for the symbol. The invention allows both soft-symbol combining and Automatic Repeat Request to be used as error correction techniques.
摘要翻译： 在采用正交频分复用的通信系统中提供了用于纠错的方法和装置。 当远程单元接收到OFDM符号时，检查重传指示符位以确定符号是原始符号还是重传符号。 如果是重传符号，并且远程单元具有存储在存储器中的对应符号，则接收的符号与存储的符号软组合。 符号中的每个数据包，如果是原始的接收到的符号，或者如果被重新发送，则由软组合符号被远程单元检查。 如果远程单元确定特定分组旨在用于远程单元，但是不能确定分组的有效载荷的内容，则远程单元向基站发送重传请求以重传该符号。 基站基于诸如分组的大小或者是否存在对该符号的附加请求的考虑来确定是否应该重传整个符号或仅重新分组。 本发明允许将软符号组合和自动重复请求用作纠错技术。
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公开(公告)号：US07110351B2
公开(公告)日：2006-09-19
申请号：US09739367
申请日：2000-12-19
IPC分类号： H04J11/00
CPC分类号： H04L1/1812 , H04L1/1845 , H04L1/1867 , H04L27/2602
摘要： A method and apparatus are provided for error correction in a communication system employing Orthogonal Frequency Division Multiplexing. When a remote unit receives an OFDM symbol, a retransmission indicator bit is examined to determine whether the symbol is an original symbol or a retransmitted symbol. If it is a retransmitted symbol and the remote unit has a corresponding symbol stored in memory, then the received symbol is soft-combined with the stored symbol. Each packet in the symbol, either the received symbol if original or the soft-combined symbol if retransmitted, is examined by the remote unit. If the remote unit determines that a particular packet is intended for the remote unit, but can not determine the contents of the payload of the packet, the remote unit sends a retransmission request to the base station for retransmission of the symbol. The base station determines whether the entire symbol or merely the packet should be retransmitted, based on such considerations as the size of the packet or whether there are additional requests for the symbol. The invention allows both soft-symbol combining and Automatic Repeat Request to be used as error correction techniques.
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公开(公告)号：US07031753B2
公开(公告)日：2006-04-18
申请号：US10737772
申请日：2003-12-18
IPC分类号： H04B1/38
CPC分类号： H04W72/08 , H04L27/2608 , H04W72/0453
摘要： A method and apparatus are provided for selecting and signalling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A sequence of numbers is generated using one set of values to identify acceptable sub-carriers and another set of values to identify unacceptable sub-carriers. The sequence of numbers is transmitted to a base station. The average signal to interference ratio of sub-carriers whose signal to interference ratio was above the threshold can also be transmitted to the base station, thereby allowing the base station to determine an optimum set of transmission parameters for use only in the acceptable sub-carriers. Alternatively, the remote unit can determine the optimum set of transmission parameters itself for transmission to the base station. As yet another alternative, the remote unit can determine an optimum Link Mode for each acceptable sub-carrier, and use a reference to the Link Modes as the set of values identifying acceptable sub-carriers. The base station transmits data over the acceptable sub-carriers at the optimum Link Mode or Link Modes. The base station may use some of the unacceptable sub-carriers for transmission of low sensitivity data at the optimum Link Mode, and may use some of the unacceptable sub-carriers for transmission of data at a lower Link Mode. The transmission power of any unused unacceptable sub-carriers can be diverted to other sub-carriers.
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公开(公告)号：US06701129B1
公开(公告)日：2004-03-02
申请号：US09670342
申请日：2000-09-27
IPC分类号： H04B1700
CPC分类号： H04L1/0029 , H04L1/0003 , H04L1/0009 , H04L1/0025 , H04L27/2608 , H04W24/00 , H04W28/06 , H04W28/18
摘要： A method is provided for adapting modulation schemes to changing channel quality with reduced overhead signalling. A remote unit measures the channel quality of a radio channel along which a signal from a base station reached the remote unit. Based on the channel quality, the remote unit determines a desired set of transmission parameters from a list of sets of transmission parameters. The remote unit determines a difference in position within the list between the current set of transmission parameters and the desired set of transmission parameters. The remote unit transmits the difference to the base station, which selects a new set of transmission parameters using the current set of transmission parameters and the difference. The method requires little signalling between the remote unit and the base station, and is particularly beneficial in communication systems employing many sub-carriers, such as OFDM systems.
摘要翻译： 提供了一种用于通过减少开销信令使调制方案适应于改变信道质量的方法。 远程单元测量来自基站的信号到达远程单元的无线电信道的信道质量。 基于信道质量，远程单元从传输参数集合的列表确定期望的一组传输参数。 远程单元确定列表内当前传输参数集合与所需传输参数集合之间的位置差异。 远程单元将差异发送到基站，其使用当前传输参数集合和差异来选择新的传输参数集合。 该方法在远程单元和基站之间几乎不需要信令，并且在采用诸如OFDM系统的许多子载波的通信系统中特别有利。
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公开(公告)号：US07414964B2
公开(公告)日：2008-08-19
申请号：US11346261
申请日：2006-02-03
IPC分类号： H04J11/00
CPC分类号： H04W72/08 , H04L27/2608 , H04W72/0453
摘要： A method and apparatus are provided for selecting and signalling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A sequence of numbers is generated using one set of values to identify acceptable sub-carriers and another set of values to identify unacceptable sub-carriers. The sequence of numbers is transmitted to a base station. The average signal to interference ratio of sub-carriers whose signal to interference ratio was above the threshold can also be transmitted to the base station, thereby allowing the base station to determine an optimum set of transmission parameters for use only in the acceptable sub-carriers. Alternatively, the remote unit can determine the optimum set of transmission parameters itself for transmission to the base station. As yet another alternative, the remote unit can determine an optimum Link Mode for each acceptable sub-carrier, and use a reference to the Link Modes as the set of values identifying acceptable sub-carriers. The base station transmits data over the acceptable sub-carriers at the optimum Link Mode or Link Modes. The base station may use some of the unacceptable sub-carriers for transmission of low sensitivity data at the optimum Link Mode, and may use some of the unacceptable sub-carriers for transmission of data at a lower Link Mode. The transmission power of any unused unacceptable sub-carriers can be diverted to other sub-carriers.
摘要翻译： 提供了一种方法和装置，用于选择和发送用于无线电通信系统中的数据传输的子载波的标识，以及用于使用其他子载波。 远程单元通过将每个子载波的信号与干扰比与阈值进行比较来确定哪些子载波可接受用于数据传输。 使用一组值来生成数字序列以识别可接受的子载波，另一组值用于识别不可接受的子载波。 数字序列被发送到基站。 信号干扰比高于阈值的子载波的平均信号干扰比也可以被发送到基站，从而允许基站确定仅在可接受的子载波中使用的最佳传输参数集合 。 或者，远程单元可以确定用于传输到基站的最佳传输参数集合本身。 作为另一替代方案，远程单元可以为每个可接受的子载波确定最佳的链路模式，并且使用对链路模式的引用作为识别可接受的子载波的值的集合。 基站以最佳链路模式或链路模式通过可接受的子载波发送数据。 基站可以使用一些不可接受的子载波用于在最佳链路模式下传输低灵敏度数据，并且可以使用一些不可接受的子载波来传输较低链路模式的数据。 任何未使用的不可接受的副载波的发射功率可以转移到其他副载波。
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公开(公告)号：US06721569B1
公开(公告)日：2004-04-13
申请号：US09672704
申请日：2000-09-29
IPC分类号： H04Q720
CPC分类号： H04W72/08 , H04L27/2608 , H04W72/0453
摘要： A method and apparatus are provided for selecting and signaling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A base station transmits data over the acceptable sub-carriers at the optimum Link Mode or Link Modes. The base station may use some of the unacceptable sub-carriers for transmission of low sensitivity data at the optimum Link Mode, and may use some of the unacceptable sub-carriers for transmission of data at a lower Link Mode. The transmission power any unused unacceptable sub-carriers can be diverted to other sub-carriers.
摘要翻译： 提供了一种方法和装置，用于选择和发送用于无线电通信系统中的数据传输的子载波的标识，以及用于使用其他子载波。 远程单元通过将每个子载波的信号与干扰比与阈值进行比较来确定哪些子载波可接受用于数据传输。 基站以最佳链路模式或链路模式通过可接受的子载波发送数据。 基站可以使用一些不可接受的子载波用于在最佳链路模式下传输低灵敏度数据，并且可以使用一些不可接受的子载波来传输较低链路模式的数据。 任何未使用的不可接受的子载波的发射功率可以转移到其他副载波。
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8.发明授权Packet communication system with dual candidate sets for independent management of uplink and downlink transmissions 有权具有双候选集的分组通信系统，用于独立管理上行链路和下行链路传输公开(公告)号：US07756520B2
公开(公告)日：2010-07-13
申请号：US09977991
申请日：2001-10-17
IPC分类号： H04W72/00
摘要： A method and apparatus are provided for selecting an optimum base station for communicating with a terminal in a wireless communication system. A base station controller stores two candidate sets for each terminal within communication range of the base stations controlled by the base station controller. One candidate set lists base stations for which the channel quality of the uplink channel between the base station and the terminal is acceptable for communication. The other candidate set lists base stations for which the channel quality of the downlink channel between is acceptable for communication. This allows the base station controller to take into account the predominant direction of traffic when assigning base stations for communication with the terminal.
摘要翻译： 提供一种用于选择用于在无线通信系统中与终端通信的最佳基站的方法和装置。 基站控制器在由基站控制器控制的基站的通信范围内为每个终端存储两个候选集。 一个候选集列出了基站和终端之间的上行链路信道的信道质量可接受用于通信的基站。 另一候选集合列出下行链路信道的信道质量对于通信是可接受的基站。 这允许基站控制器在分配用于与终端通信的基站时考虑业务的主要方向。
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公开(公告)号：US07463616B1
公开(公告)日：2008-12-09
申请号：US10108624
申请日：2002-03-28
IPC分类号： H04B7/212
CPC分类号： H04W72/1231
摘要： The present invention keeps track of channel change indicia associated with wireless communications with mobile terminals, and bases the scheduling of data in time slots of a scheduling period on the channel change indicia. The channel change indicia may be derived from any information that bears on the rate at which channel conditions are likely to change, such as the velocity the mobile terminals are traveling or actual channel condition measurements. Preferably, mobile terminals associated with intermediate values for the channel change indicia are given priority, and thus, scheduled for transmission before those with lower and higher values. The invention is applicable to uplink and downlink communications, and is particularly beneficial when implemented in uplink and downlink schedulers in a base station.
摘要翻译： 本发明跟踪与移动终端的无线通信相关联的信道变化标记，并且将调度周期的时隙中的数据调度作为信道变化标记。 信道改变标记可以从信道条件可能改变的速率的任何信息，诸如移动终端正在行进的速度或实际的信道条件测量得出。 优选地，与信道改变标记的中间值相关联的移动终端被给予优先级，因此被调度为在具有较低和较高值的那些之前发送。 本发明适用于上行链路和下行链路通信，并且当在基站中的上行链路和下行链路调度器中实现时是特别有益的。
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公开(公告)号：US07436834B1
公开(公告)日：2008-10-14
申请号：US11552797
申请日：2006-10-25
申请人： Hang Zhang , Bassam M. Hashem , Mark Earnshaw , Eman A Fituri
发明人： Hang Zhang , Bassam M. Hashem , Mark Earnshaw , Eman A Fituri
IPC分类号： H04L12/26
CPC分类号： H04L1/1671 , H04L1/1887 , H04L1/189 , H04W48/08 , H04W72/0406
摘要： A multiplexer function maintains a transmission table of all link control frames sent to a physical layer for transmission to a receiver. The transmission table includes a list of frames from various link control entities in the order in which they were multiplexed together to form a stream of frames. At the receiver, when a frame is detected that is in error, the physical layer sends an indication to its associated demultiplexer function, which sets a timer. When the timer expires, the demultiplexer function issues a message, such as a negative acknowledgement message, directly to the sender via the physical layer. The message includes information about the link control frames preceding and following the errant frame. The identified frames may be associated with different link control entities, and are preferably provided in the order in which they were received. The multiplexer function compares the identified frames in the message to the list of frames in the transmission table to identify the errant frame or frames and operates to effect retransmission of the errant frame.
摘要翻译： 复用器功能维护发送到物理层的所有链路控制帧的传输表，以传输到接收机。 传输表包括来自各种链路控制实体的帧的列表，其顺序被多路复用在一起以形成帧流。 在接收机处，当检测到错误的帧时，物理层向其相关联的解复用器功能发送指示，该功能设置定时器。 当定时器到期时，解复用器功能通过物理层直接向发送者发出消息，例如否定确认消息。 该消息包括关于在错误帧之前和之后的链路控制帧的信息。 所识别的帧可以与不同的链路控制实体相关联，并且优选地以它们被接收的顺序提供。 复用器功能将消息中识别的帧与发送表中的帧列表进行比较，以识别出错误的帧或帧，并且操作以实现错误帧的重传。
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