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1. 发明申请

WO2015061729A1 RANGE EXTENSION MODE FOR WIFI 审中-公开
标题翻译： WIFI范围扩展模式
公开(公告)号：WO2015061729A1
公开(公告)日：2015-04-30
申请号：PCT/US2014/062247
申请日：2014-10-24
申请人： MARVELL WORLD TRADE LTD. , ZHANG, Hongyuan , LOU, Hui-Ling , YONG, Su, Khiong
发明人： ZHANG, Hongyuan , LOU, Hui-Ling , YONG, Su, Khiong
IPC分类号： H04L27/26
CPC分类号： H04L27/2605 , H04J11/00 , H04L1/0057 , H04L27/2613 , H04L27/2698 , H04W52/286 , H04W84/12
摘要： A method for generating a physical layer (PHY) data unit for transmission via a communication channel is described where the PHY data unit conforms to a first communication protocol. Orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit are generated according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol. A preamble of the PHY data unit is generated, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme. The first portion of the preamble is formatted such that the first portion of the preamble is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine the duration of the PHY data unit based on the first portion of the preamble. The PHY data unit is generated to include the preamble and the data field.
摘要翻译：描述了通过通信信道生成用于传输的物理层（PHY）数据单元的方法，其中PHY数据单元符合第一通信协议。根据与第一通信协议的范围扩展模式对应的范围扩展编码方案，生成用于PHY数据单元的数据字段的正交频分复用（OFDM）符号。生成PHY数据单元的前同步码，前导码具有i）指示PHY数据单元的持续时间的第一部分，以及ii）指示是否根据该数据字段生成数据字段的至少一些OFDM符号的第二部分范围扩展编码方案。前导码的第一部分被格式化为使得前导码的第一部分可以由符合第二通信协议但不符合第一通信协议的接收机设备解码，以便基于PHY数据单元的持续时间来确定在序言的第一部分。生成PHY数据单元以包括前导码和数据字段。

2. 发明申请

WO2014121089A1 FREQUENCY OFFSET COMPENSATION FOR WIFI RANGING 审中-公开
标题翻译：无线范围频率偏移补偿
公开(公告)号：WO2014121089A1
公开(公告)日：2014-08-07
申请号：PCT/US2014/014179
申请日：2014-01-31
申请人： MARVELL WORLD TRADE LTD. , ZHANG, Hongyuan , YU, Mao , YONG, Su, Khiong , SRINIVASA, Sudhir
发明人： ZHANG, Hongyuan , YU, Mao , YONG, Su, Khiong , SRINIVASA, Sudhir
IPC分类号： H04W56/00 , G01S5/02
CPC分类号： H04W56/004 , G01S5/06 , G01S11/02 , G01S13/767 , H04W56/002 , H04W64/003
摘要： Methods, systems, and apparatus are disclosed for determining accurate ranging measurements between communication devices. Various embodiments are described for recording timestamps associated with when transmissions are sent and received between the communication devices. The communication devices are configured to determine a difference in their clock frequencies and to communicate this difference with one another. Furthermore, each of the communication devices is configured to compensate for these differences before or after the timestamps are exchanged and to send a compensation indicator of whether the compensation has been performed. If the compensation has not been performed, either of the communication devices can compensate for the clock frequency differences after receiving the timestamps based on the compensation indicator. By using compensated clock frequencies based on a single clock reference, highly accurate ranging measurements are obtained using round trip propagation time calculations.
摘要翻译：公开了用于确定通信设备之间的精确测距测量的方法，系统和装置。描述了用于记录与在通信设备之间发送和接收传输时相关联的时间戳的各种实施例。通信设备被配置为确定其时钟频率的差异并且将这种差异传达给彼此。此外，每个通信设备被配置为在交换时间戳之前或之后补偿这些差异，并且发送是否已经执行了补偿的补偿指示符。如果没有执行补偿，则任一通信设备可以基于补偿指示符来补偿接收到时间戳之后的时钟频率差。通过使用基于单个时钟参考的补偿时钟频率，可以使用往返传播时间计算获得高精度的测距。

3. 发明申请

WO2013106404A1 SYSTEMS AND METHODS FOR ESTABLISHING A WI-FI DISPLAY (WFD) SESSION 审中-公开
标题翻译：用于建立无线显示（WFD）会议的系统和方法
公开(公告)号：WO2013106404A1
公开(公告)日：2013-07-18
申请号：PCT/US2013/020793
申请日：2013-01-09
申请人： MARVELL WORLD TRADE LTD. , NAGAWADE, Deepak, Shahaji , YONG, Su, Khiong , WAGHOLIKAR, Sarang, Shrikrishna
发明人： NAGAWADE, Deepak, Shahaji , YONG, Su, Khiong , WAGHOLIKAR, Sarang, Shrikrishna
IPC分类号： H04W76/02 , H04W8/00 , H04L29/08
CPC分类号： H04L65/1069 , H04L67/16 , H04L69/32 , H04W8/005
摘要： Systems, methods, apparatus, and techniques are provided for establishing an application layer communications session over a layer 2 (L2) communications connection. In particular, a discovery request frame is transmitted from a first device. A discovery response frame is received at the first device, where the discovery response frame is transmitted from a second device in response to having received the discovery request frame. An application layer communications session is established between the first device and the second device while maintaining an existing L2 communications connection between the first device and the second device.
摘要翻译：提供了系统，方法，装置和技术，用于在层2（L2）通信连接上建立应用层通信会话。具体地，从第一设备发送发现请求帧。在第一设备处接收到发现响应帧，其中响应于已经接收到发现请求帧，从第二设备发送发现响应帧。在第一设备和第二设备之间建立应用层通信会话，同时保持第一设备和第二设备之间的现有L2通信连接。

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