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公开(公告)号：EP1576838A1
公开(公告)日：2005-09-21
申请号：EP02794132.7
申请日：2002-12-05
IPC分类号： H04Q7/20
CPC分类号： H04W72/042
摘要： A base station (101) broadcast via an assignment segment which wireless terminal (103-1, 103-2, 103-Y) is to use a particular traffic segment.
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公开(公告)号：EP1442527A1
公开(公告)日：2004-08-04
申请号：EP02800936.3
申请日：2002-10-07
CPC分类号： H03M13/1137 , G06N3/02 , H03M13/1102 , H03M13/1111 , H03M13/1117 , H03M13/112 , H03M13/1125 , H03M13/1131 , H03M13/1134 , H03M13/1145 , H03M13/6362 , H03M13/6502 , H03M13/6577 , H03M13/658 , H03M13/6583
摘要： Techniques for implementing message passing decoders, e.g., LDPC decoders, are described. To facilitate hardware implementation messages are quantized to integer multiples of ½ ln2. Messages are transformed between more compact variable and less compact constraint node message representation formats. The variable node message format allows variable node message operations to be performed through simple additions and subtractions while the constraint node representation allows constraint node message processing to be performed through simple additions and subtractions. Variable and constraint nodes are implemented using an accumulator module (1302), subtractor module (1304) and delay pipeline (1306). The accumulator module (1302) generates an accumulated message sum (1316). The accumulated message sum (1316) for a node is stored and then delayed input messages from the delay pipeline (1306) are subtracted there from to generate output messages (1321). The delay pipeline (1306) includes a variable delay element making it possible to sequentially perform processing operations corresponding to nodes of different degrees.
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63.发明公开Idendification of a base station, using latin-square hopping sequences, in multicarrier spread-spectrum systems 审中-公开通过使用基于所述拉丁方跳频在多载波扩频序列的基站的标识
公开(公告)号：EP1148673A3
公开(公告)日：2004-01-07
申请号：EP01303316.2
申请日：2001-04-09
发明人： Laroia, Rajiv , Li, Junyi , Rangan, Sundeep , Viswanath, Pramod
CPC分类号： H04B1/7143 , H04B1/7156 , H04B2001/71563 , H04L5/0019 , H04L5/0048 , H04L25/0226 , H04L27/2613 , H04L27/2657 , H04L27/2675
摘要： A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted set of pilot tone locations having the maximum received energy. In another embodiment, the frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.
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公开(公告)号：EP1366591A2
公开(公告)日：2003-12-03
申请号：EP02706481.5
申请日：2002-03-04
发明人： LAROIA, Rajiv , LI, Junyi , PARIZHSKY, Vladimir
IPC分类号： H04L7/033
CPC分类号： H04W56/0045 , H04L5/023 , H04L7/0334 , H04L27/2646 , H04L27/2662 , H04W56/0005
摘要： Symbol timing synchronization in OFDM communication systems where multiple wireless terminals communicate with a single base station is described. Base station transmitter and receiver symbol timing is fixed. Each wireless terminal operates to independently adjust its transmitter timing. Transmitter timing synchronization at the wireless terminal is slaved to the terminal's receiver timing synchronization. each wireless terminal first corrects its receiver symbol timing based on a signal received from the base station. The wireless terminal then adjusts its transmitter symbol timing as a function of its receiver symbol timing. When the receiver symbol timing is to be advanced or delayed by some amount, the transmitter symbol timing is also advanced or delayed, respectively, by the same, or substantially the same, amount. Symbol timing adjustment can be made by adding or deleting digital samples from the first or last symbol in a dwell.
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公开(公告)号：EP2005276A2
公开(公告)日：2008-12-24
申请号：EP07759831.6
申请日：2007-03-30
IPC分类号： G06F1/04
CPC分类号： G06F1/04
摘要： A multimode, uniform-latency clock generation circuit (CGC) is described herein. In one example, the multimode, uniform-latency CGC generates a pulse clock signal via a clock generation path responsive to a clock chopping signal being active and generates a phase clock signal via the same clock generation path responsive to the clock chopping signal being inactive. The clock chopping signal is activated responsive to a mode control input signal being in a first state and deactivated responsive to either the mode control input signal being in a second state or a plurality of clock enable signals being inactive. In one or more embodiments, a multimode, uniform-latency CGC is included in a microprocessor for providing pulse clock signals to inter-stage pulsed sequential storage elements when operating in a timing sensitive mode and for providing phase clock signals to the inter-stage pulsed sequential storage elements when operating in a timing insensitive mode.
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66.发明公开COMMUNICATIONS METHOD AND APPARATUS USING PHYSICAL ATTACHMENT POINT IDENTIFIERS 审中-公开KOMMUNIKATIONSVERFAHREN UND -VORRICHTUNG麻省理工学院BEFESTIGUNGSPUNKT-IDENTIFIKATOREN
公开(公告)号：EP1964430A1
公开(公告)日：2008-09-03
申请号：EP06845800.9
申请日：2006-12-20
摘要： Methods and apparatus for routing messages between an end node and an access node via another access node are described. Physical layer identification information is used when identifying a remote, e.g., adjacent, access node as a message destination. Thus, when a connection identifier based on one or more physical layer identifiers is available to a wireless terminal, e.g., from one or more downlink signals received from a destination access node, the wireless terminal can use the connection identifier corresponding to the destination node to route a message via an access node with which it has an established uplink connection. Such connection identifier information can be used even when other addressing information, e.g., network layer address information, associated with the destination access node, may not be available to the wireless terminal.
摘要翻译： 描述了通过另一接入节点在终端节点和接入节点之间路由消息的方法和装置。 当识别远程例如相邻的接入节点作为消息目的地时，使用物理层标识信息。 因此，当基于一个或多个物理层标识符的连接标识符可用于无线终端时，例如，从一个或多个从目的地接入节点接收的下行链路信号，无线终端可以使用与目的地节点对应的连接标识符 通过其具有建立的上行链路连接的接入节点路由消息。 即使当与目的地接入节点相关联的其他寻址信息（例如网络层地址信息）对于无线终端可能不可用时，也可以使用这种连接标识符信息。
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公开(公告)号：EP1964339A1
公开(公告)日：2008-09-03
申请号：EP06847976.5
申请日：2006-12-20
发明人： LAROIA, Rajiv , ANIGSTEIN, Pablo , MAZIK, David, R. , PARIZHSKY, Vladimir , PARK, Vincent , SRINIVASAN, Murari , TSIRTSIS, George
IPC分类号： H04L12/56
CPC分类号： H04W8/005 , H04L41/069 , H04L45/02 , H04L45/28
摘要： Methods and apparatus for using end nodes, e.g., wireless terminals, to discover base stations and communicate information about discovered access nodes, e.g., base stations, to other access nodes in a system are described. As the wireless terminal roams in the system and new access nodes are encountered, one or more physically adjacent access nodes will be informed of the presence of the new access node as a result of communications with the wireless terminal. A message indicating an access node's inability to route a message to another access node which is known to a wireless terminal may trigger the wireless terminal to begin the process of updating access node routing and neighbor information.
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68.发明公开
公开(公告)号：EP1964338A2
公开(公告)日：2008-09-03
申请号：EP06847975.7
申请日：2006-12-20
IPC分类号： H04L12/56
摘要： Methods and apparatus for routing messages between an end node and an access node via another access node are described. Physical layer identification information is used when identifying a remote, e.g., adjacent, access node as a message destination. Thus, when a connection identifier based on one or more physical layer identifiers is available to a wireless terminal, e.g., from one or more downlink signals received from a destination access node, the wireless terminal can use the connection identifier corresponding to the destination node to route a message via an access node with which it has an established uplink connection. Such connection identifier information can be used even when other addressing information, e.g., network layer address information, associated with the destination access node, may not be available to the wireless terminal.
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69.发明公开
公开(公告)号：EP1938511A1
公开(公告)日：2008-07-02
申请号：EP06803630.0
申请日：2006-09-15
IPC分类号： H04L12/28
CPC分类号： H04W36/0055
摘要： Methods and apparatus for storing, manipulating, retrieving, and forwarding state, e.g., context and other information, used to support communications sessions with one or more end nodes, e.g., mobile devices, are described. Various features are directed to a end node controlling the transfer of state from a first access node to a second access node during a handoff operation thereby eliminating any need for state transfer messages to be transmitted between the second access node and the first access node during handoff or the use of a core network node to support state transfer. As part of a handoff state information is obtained by an end node from the current access node in encrypted form and then communicated to the new access node to which the handoff operation is to be completed. The new access node, e.g., base station decrypts the state information and then uses it to support communications with the end node. While the information is communicated to and from the end node over wireless links, since it is encrypted by the first access node it is secure and can be trusted by the receiving, e.g., target, access node.
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公开(公告)号：EP1442527A4
公开(公告)日：2008-06-04
申请号：EP02800936
申请日：2002-10-07
发明人： RICHARDSON TOM , NOVICHKOV VLADIMIR
IPC分类号： G06F11/10 , H03M13/11 , G06F17/50 , G06N3/02 , H03M13/00 , H03M13/03 , H03M13/09 , H03M13/19 , H03M13/39
CPC分类号： H03M13/1137 , G06N3/02 , H03M13/1102 , H03M13/1111 , H03M13/1117 , H03M13/112 , H03M13/1125 , H03M13/1131 , H03M13/1134 , H03M13/1145 , H03M13/6362 , H03M13/6502 , H03M13/6577 , H03M13/658 , H03M13/6583
摘要： Techniques for implementing message passing decoders, e.g., LDPC decoders, are described. To facilitate hardware implementation messages are quantized to integer multiples of ½ ln2. Messages are transformed between more compact variable and less compact constraint node message representation formats. The variable node message format allows variable node message operations to be performed through simple additions and subtractions while the constraint node representation allows constraint node message processing to be performed through simple additions and subtractions. Variable and constraint nodes are implemented using an accumulator module (1302), subtractor module (1304) and delay pipeline (1306). The accumulator module (1302) generates an accumulated message sum (1316). The accumulated message sum (1316) for a node is stored and then delayed input messages from the delay pipeline (1306) are subtracted there from to generate output messages (1321). The delay pipeline (1306) includes a variable delay element making it possible to sequentially perform processing operations corresponding to nodes of different degrees.
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