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    Access channel structure for wireless communication system
    33.
    发明授权
    Access channel structure for wireless communication system 有权
    无线通信系统的接入信道结构

    公开(公告)号：US07483473B2

    公开(公告)日：2009-01-27

    申请号：US11103202

    申请日：2005-04-11

    Applicant: John E. Hoffmann ,  George Rodney Nelson, Jr. ,  James A. Proctor, Jr. ,  Antoine J. Rouphael

    Inventor： John E. Hoffmann ,  George Rodney Nelson, Jr. ,  James A. Proctor, Jr. ,  Antoine J. Rouphael

    IPC: H04L27/30

    CPC classification number: H04L5/0046 ,  H04B1/707 ,  H04B2201/70701 ,  H04L7/041

    Abstract: A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter. The additional pilot symbols embedded in the payload portion are used in a cross product operation to further resolve the effects of multipath fading.

    Abstract translation: 一种在无线通信系统中在反向链路上有效实现导频信号的技术。 为反向链路定义了一个接入信道，使得在每个帧或时期内，一部分专用于仅发送导频符号。 帧的另一部分保留用于主要发送数据符号; 然而，在帧的该第二部分内，在数据符号之间交织附加的导频符号。 访问信道帧的导频符号或前导码部分允许在基站处有效地获取接入信号，同时提供用于确定多径衰落的影响的定时参考。 具体地，导频相关滤波器从前导码部分中的导频符号提供相位估计，然后该导频符号用于解码有效载荷部分中的数据符号。 接收机的访问获取部分使用由导频相关滤波器提供的相位估计来处理数据符号相关滤波器的输出。 嵌入在有效载荷部分中的附加导频符号用于交叉乘积运算，以进一步解决多路径衰落的影响。

    Power control protocol for highly variable data rate reverse link of a wireless communication system
    34.
    发明授权
    Power control protocol for highly variable data rate reverse link of a wireless communication system 有权
    用于无线通信系统高可变数据速率反向链路的功率控制协议

    公开(公告)号：US07184417B2

    公开(公告)日：2007-02-27

    申请号：US11250727

    申请日：2005-10-14

    Applicant: James A. Proctor, Jr.

    Inventor： James A. Proctor, Jr.

    IPC: H04Q7/00 ,  H04Q7/20 ,  H04B7/00 ,  H04B1/00

    CPC classification number: H04W52/04 ,  H04B7/2628 ,  H04W52/08 ,  H04W52/143 ,  H04W52/146 ,  H04W52/287 ,  H04W52/288 ,  H04W52/50 ,  H04W52/58

    Abstract: A technique for implementing closed loop power control in a wireless system using a modulation that requires synchronization over the radio channel, which dynamically assigns coded channels on a demand basis. The technique maintains a proper power level, even when no traffic channels are allocated, by determining a link quality metric based upon the reverse link power received. This determination is made in response to a heartbeat signal sent at a rate which is only sufficiently fast to maintain code phase lock, for example, depending upon the expected maximum rate at which the subscriber unit will travel.

    Abstract translation: 一种用于在无线系统中实现闭环功率控制的技术，其使用需要通过无线电信道进行同步的调制，其基于需求动态地分配编码信道。 即使没有业务信道被分配，该技术通过基于所接收的反向链路功率确定链路质量度量来维持适当的功率电平。 该确定响应于仅以足够快的速率发送的心跳信号，以维持代码锁相，例如，取决于用户单元将要行进的预期最大速率。

    Maintenance link using active/standby request channels
    35.
    发明授权
    Maintenance link using active/standby request channels 失效

    公开(公告)号：US07079523B2

    公开(公告)日：2006-07-18

    申请号：US09775305

    申请日：2001-02-01

    Applicant: G. Rodney Nelson, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael ,  James A. Proctor, Jr.

    Inventor： G. Rodney Nelson, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael ,  James A. Proctor, Jr.

    IPC: H04B7/216 ,  G08C17/00

    CPC classification number: H04W56/0085 ,  H04B7/2637

    Abstract: Multiple field units in a CDMA system are synchronized for communication with a base station using shared forward and reverse link channels. In an illustrative embodiment, each field unit is assigned a time slot in a forward link channel to receive messages from the base station. Likewise, each field unit is assigned a time slot on a common reverse link channel for transmitting messages to the base station. Timing alignment and power level control among each of many field units and the base station is achieved by analyzing messages received at the base station in a corresponding time slot as transmitted by each field unit. Thereafter, a message is transmitted from the base station in a corresponding time slot to a particular field unit for adjusting its timing or power level so that future messages transmitted from the field unit are received in the appropriate time slot at the base station at a desired power level. In this way, minimal resources are deployed to maintain communication and precise synchronization between a base station and each of multiple users, minimizing collisions between field units transmitting in adjacent time slots on the reverse link. This method reduces the frequency a field unit must rely on the use of a slotted aloha random access channel according to IS-95.

    Qualifying available reverse link coding rates from access channel power setting
    36.
    发明授权
    Qualifying available reverse link coding rates from access channel power setting 有权

    公开(公告)号：US07006483B2

    公开(公告)日：2006-02-28

    申请号：US09792637

    申请日：2001-02-23

    Applicant: George Rodney Nelson, Jr. ,  James A. Proctor, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael

    Inventor： George Rodney Nelson, Jr. ,  James A. Proctor, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael

    IPC: H04B7/212

    CPC classification number: H04W72/042 ,  H04J13/00 ,  H04J13/0003 ,  H04L5/22 ,  H04W24/00 ,  H04W28/22 ,  H04W48/08 ,  H04W52/24 ,  H04W52/26 ,  H04W52/365 ,  H04W72/0406 ,  H04W72/0446 ,  H04W72/0466 ,  H04W72/0473 ,  H04W72/048 ,  H04W72/1289 ,  Y02D70/00

    Abstract: Data rate allocation decisions are made for a communications channel, such as a wireless reverse link connection. A first parameter used in this determination is a path loss, which is determined by the following process. First, a message is sent from a first station to a second station, such as on a paging channel. The message indicates a forward Effective Radiated Power (ERP) of a pilot signal transmitted by the first station. The second station then determines the received signal strength of this pilot signal, taking into account receiver gains. The path loss can then be estimated by the second station as the difference between the forward ERP data value that it received and the detected received pilot power. The second station also then preferably determines a transmit power level when transmitting a message back to the first station. This transmit power level information is encoded as a digital data word together with the forward path loss information as calculated by the first station. Upon receipt of these two pieces of information by the first station, the forward path loss estimate as calculated by the second station, and the output power value of the second station, the first station can then determine the amount of excess power available at the field unit. This excess power difference is indicative of the amount of dynamic range available in the transmit power amplifier in the particular second station. With this information, the first station can then make a determination as to whether coding rates which require a higher dynamic range will be acceptable for use by the particular second station.

    Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels
    37.
    发明授权
    Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels 有权

    公开(公告)号：US07006428B2

    公开(公告)日：2006-02-28

    申请号：US09898514

    申请日：2001-07-03

    Applicant: James A. Proctor, Jr. ,  Pertti O. Alapuranen

    Inventor： James A. Proctor, Jr. ,  Pertti O. Alapuranen

    IPC: H04J11/00

    CPC classification number: H04J13/0022 ,  H04B7/2628 ,  H04B2201/70703 ,  H04J13/10 ,  H04J13/16 ,  H04J13/18

    Abstract: A technique for allowing a first and second group of users to share access to a communication channel such as a radio channel. A first group of users is typically a legacy group of users such as those using digital CDMA cellular telephone equipment. The second group of users are a group of data users that code their transmissions in different formats optimized for data functionalities. The first group of users share one modulation structure such as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users share another modulation structure but in a manner that is consistent and compatible with the users of the first group. Specifically, the users of the second group may all use the same PN code and code phase offset. However, they are uniquely identified such as, for example, assigning each of them a unique orthogonal code.

    Access probe acknowledgment including collision detection to avoid oversetting initial power level
    40.
    发明授权
    Access probe acknowledgment including collision detection to avoid oversetting initial power level 有权
    访问探测确认，包括碰撞检测，以避免初始功率级别过大

    公开(公告)号：US06545994B2

    公开(公告)日：2003-04-08

    申请号：US09792410

    申请日：2001-02-23

    Applicant: George R. Nelson, Jr. ,  James A. Proctor, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael

    Inventor： George R. Nelson, Jr. ,  James A. Proctor, Jr. ,  John E. Hoffmann ,  Antoine J. Rouphael

    IPC: H04B7212

    CPC classification number: H04W52/242 ,  H04L1/1607 ,  H04L12/5602 ,  H04L47/14 ,  H04L47/26 ,  H04L2001/0093 ,  H04W24/00 ,  H04W52/228 ,  H04W52/48 ,  H04W52/50 ,  H04W74/0825 ,  H04W74/0858

    Abstract: In an illustrative embodiment of the present invention, a first channel is allocated for transmitting sporadically generated messages from multiple field units to a base station. The first channel is preferably divided into time slots in which a field unit transmits an access request message to the base station for establishing a communication link. In response to an access request message, feedback information is provided from the base station to multiple field units indicating whether a collision was detected on the first channel for a message transmitted in a previous time slot. In an instance when a collision is detected, the field unit will re-transmit an access request message at a previous power level setting based on a random back off time. If no collision is detected and the base station fails to transmit an acknowledgment message from the base station to the access requesting field unit, the power output level of the field unit is increased for successive message transmissions until the message is received.

    Abstract translation: 在本发明的说明性实施例中，分配第一信道用于将来自多个场单元的偶发生成的消息发送到基站。 第一信道优选地被划分为时隙，其中，场单元向基站发送接入请求消息以建立通信链路。 响应于访问请求消息，反馈信息从基站提供给多个字段单元，指示在第一信道上是否检测到在先前时隙中发送的消息的冲突。 在检测到冲突的情况下，场单元将基于随机退避时间在先前功率电平设置下重新发送接入请求消息。 如果没有检测到冲突，并且基站无法从基站向接入请求字段单元发送确认消息，则对于连续的消息传输增加了现场单元的功率输出电平，直到接收到消息。

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