公开(公告)号：US6078826A

公开(公告)日：2000-06-20

申请号：US86873

申请日：1998-05-29

申请人： Thomas M. Croft ,  Paul Dent

发明人： Thomas M. Croft ,  Paul Dent

IPC分类号： H02J9/00 ,  H04B1/16 ,  H04M1/73 ,  H04W52/02 ,  H04B1/38

CPC分类号： H02J9/005 ,  H04B1/1615 ,  H04W52/0254 ,  H04W4/02 ,  Y02B60/50

摘要： A mobile telephone able to save power in response to the position of the mobile telephone is disclosed. Location circuitry within the mobile telephone enables the establishment of one or more deep-sleep locations associated with a mobile telephone. When the location circuitry determines that the current location of the mobile telephone is within a selected distance of one of the deep-sleep locations, the mobile telephone operates according to a low power mode of operation wherein only a timer enabling periodic updates of the mobile telephone's position is active. If the location circuitry determines that the mobile telephone is not within a selected distance of one of the predetermined locations, the mobile telephone operates in a standby mode which utilizes more power than the deep-sleep mode but still conserves battery power and enables the mobile telephone to receive calls.

摘要翻译： 公开了能够响应于移动电话的位置来节省电力的移动电话。 移动电话内的位置电路使得能够建立与移动电话相关联的一个或多个深度睡眠位置。 当位置电路确定移动电话的当前位置在深度睡眠位置之一的选定距离内时，移动电话根据低功率操作模式操作，其中只有定时器能够定期更新移动电话的 职位是活跃的 如果位置电路确定移动电话不在预定位置之一的选定距离内，则移动电话在待机模式下工作，该待机模式利用比深度睡眠模式更多的功率，但是仍然节省电池电力并且使移动电话 接听电话。

公开(公告)号：US5148485A

公开(公告)日：1992-09-15

申请号：US708876

申请日：1991-05-31

申请人： Paul Dent

发明人： Paul Dent

IPC分类号： H04L9/22 ,  H04W12/02

CPC分类号： H04L9/0662 ,  H04L9/12 ,  H04L2209/122 ,  H04L2209/805 ,  H04L63/0457 ,  H04W12/02

摘要： A system for generating a pseudo-random bit sequence which may be used in enciphering digital data prior to transmission or storage of the data. The bit sequence is generated by expanding a plurality of secret key bits in a manner suitable for implementation with a conventional microprocessor arithmetic logic unit (ALU). The system of the present invention may be used, for example, to secure voice or data communications between a base station and a mobile station in a digital cellular communications system.

摘要翻译： 一种用于产生伪随机比特序列的系统，其可以在传输或存储数据之前用于对数字数据进行加密。 通过以适合于用常规微处理器算术逻辑单元（ALU）实现的方式扩展多个秘密密钥位来产生比特序列。 本发明的系统可以用于例如数字蜂窝通信系统中的基站和移动台之间的语音或数据通信。

公开(公告)号：US5091942A

公开(公告)日：1992-02-25

申请号：US556890

申请日：1990-07-23

申请人： Paul Dent

发明人： Paul Dent

IPC分类号： H04K1/02 ,  H04L9/06 ,  H04L9/14 ,  H04L9/32 ,  H04W12/00

CPC分类号： H04W12/06 ,  H04K1/02 ,  H04L9/0891 ,  H04L9/3271 ,  H04L2209/80

摘要： A system for the authentication of mobile stations and base stations in a cellular communications network. The system includes an algorithm which generates not only a key dependent response to a random challenge, but also a temporary conversation key or call variable which may be used to encipher traffic in the network. To protect against clones in the network, the algorithm uses a rolling key which contains historical information. A bilateral authentication procedure may be used to update the rolling key and to generate a new conversation key.

摘要翻译： 一种用于蜂窝通信网络中的移动台和基站认证的系统。 该系统包括不仅产生随机挑战的密钥相关响应的算法，而且还产生可用于加密网络中的业务的临时会话密钥或呼叫变量。 为了防止网络中的克隆，该算法使用包含历史信息的滚动密钥。 可以使用双向认证过程来更新滚动密钥并生成新的会话密钥。

公开(公告)号：US5081679A

公开(公告)日：1992-01-14

申请号：US556103

申请日：1990-07-20

申请人： Paul Dent

发明人： Paul Dent

IPC分类号： H04L9/00 ,  H04L9/12 ,  H04W12/00

CPC分类号： H04W12/02 ,  H04L9/0656 ,  H04L9/12 ,  H04L2209/80

摘要： A system for the synchronization of encryption and decryption in a duplex cellular radio system in which an encrypted call may be switched from one cell to another. At the instant of handoff, a rapid first resynchronization means temporarily seizes the voice channel in one direction only and transmits synchronization information in such one direction. The first resynchronization means ceases to transmit the synchronization information and releases such one direction of the voice channel as soon as an indicator of successful resynchronization is detected in the other direction. Transmission of speech traffic in such one direction is then resumed after such detection of successful resynchronization. To avoid occupying such one direction with continuous transmission of the synchronization information in the event successful resynchronization has occurred but has not been detected due to faulty transmission in the other direction, an upper limit is set on the length of time which the first rapid synchronization means may cease such one direction. After such timeout, resynchronization information may be provided by a second resynchronization means at a slower rate through a slow rate control channel bit stream which is multiplexed with the traffic data.

摘要翻译： 一种用于在双工蜂窝无线电系统中加密和解密同步的系统，其中加密的呼叫可以从一个小区切换到另一个小区。 在切换时刻，快速的第一重新同步装置仅在一个方向暂时占用语音信道，并在这一个方向上发送同步信息。 一旦在另一方向检测到成功的重新同步的指示符，则第一重新同步装置停止发送同步信息并释放语音信道的这个一个方向。 然后在这种成功重新同步的检测之后恢复在这样一个方向上的语音业务的传输。 为了避免在发生成功的重新同步的情况下连续发送同步信息而占用这样的一个方向，但是由于另一个方向的发送故障而没有被检测到，所以在第一快速同步装置的时间长度上设定上限 可能会停止这样的一个方向。 在这样的超时之后，可以通过与业务数据复用的慢速率控制信道比特流，以较慢的速率由第二重新同步装置提供重新同步信息。

公开(公告)号：US5066927A

公开(公告)日：1991-11-19

申请号：US578259

申请日：1990-09-06

申请人： Paul Dent

发明人： Paul Dent

IPC分类号： H03K23/64 ,  H03K23/66 ,  H03L7/193 ,  H03L7/197

CPC分类号： H03L7/193 ,  H03K23/667

摘要： In a phase locked loop having a variable divider, a dual modulus counter is used to provide the variable divider with selection signals. The variable divider is capable of providing an overall division ratio in increments of one over a contiguous range of values. The dual modulus counter includes a counter, a comparator and logic gates which generate selection signals that allow the variable divider to divide an input signal by at least division ratios R1 and R2. A phase locked loop utilizing the dual modulus counter is particularly well suited for use in a digital frequency synthesizer.