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    • 6. 发明授权
    • Channel selection and clarity improvement for digital cordless telephones operating in an overlapped range
    • 在重叠范围内工作的数字无绳电话的频道选择和清晰度提升
    • US06498935B1
    • 2002-12-24
    • US09293850
    • 1999-04-19
    • Joseph M. CannonRichard L. McDowellPhilip D. Mooney
    • Joseph M. CannonRichard L. McDowellPhilip D. Mooney
    • H04Q720
    • H04W16/16
    • When a plurality of cordless telephones (e.g., digital cordless telephones) are used within range of one another, base units of one or more of the digital cordless telephones may receive transmissions from others of the digital cordless telephones. Conventionally, the base unit would simply ignore information relating to that received from an unintended remote handset, i.e., a remote handset having a security code which fails to match that of the receiving base unit. However, in accordance with the principles of the present invention, information regarding the unique security code received with respect to other remote handsets (i.e., those having security codes which do not match that of the receiving base unit), are logged and used in a way which provides a unique best available channel list to each of the digital cordless telephones so that similar digital cordless telephones operating in a similar environment do not attempt selection of channels in a similar way (causing channel inclarity and/or interference). In a first embodiment, the list of best available channels is randomized based on the unique security code of the relevant digital cordless telephone. In a second embodiment, the list of best available channels is randomized only when another digital cordless telephone becomes within transmission range of the relevant digital cordless telephone. In a third embodiment, a list of best available channels is uniquely indexed for each digital cordless telephone based on a ranking of the digital cordless telephones within transmission range of one another. For instance, the highest ranking digital telephone in an environment with three digital cordless telephones attempts use of, preferably in order, the 1st, 4th, 7th, 10th, etc. channels.
    • 当在彼此的范围内使用多个无绳电话(例如,数字无绳电话)时,一个或多个数字无绳电话的基本单元可以接收来自数字无绳电话中的其他人的传输。 通常,基本单元将简单地忽略与从非预期的远程手机(即,具有不匹配接收基站单元的安全码的远程手机)接收到的信息有关的信息。 然而,根据本发明的原理,关于与其他远程手机(即,具有与接收基站单元不匹配的安全代码的那些)相关的唯一安全密码的信息被记录并使用在 为每个数字无绳电话提供独特的最佳可用频道列表,使得在类似环境中操作的类似数字无绳电话不以类似的方式尝试选择频道(导致频道内容和/或干扰)。 在第一实施例中,基于相关数字无绳电话的唯一安全码,将最佳可用频道的列表随机化。 在第二实施例中,只有当另一数字无绳电话变成相关数字无绳电话的传输范围内时,最佳可用频道的列表是随机化的。 在第三实施例中,基于数字无绳电话在彼此的传输范围内的等级,为每个数字无绳电话唯一索引最佳可用信道的列表。 例如,在具有三个数字无绳电话的环境中的最高等级的数字电话尝试优选地使用第一,第四,第七,第十等等频道。
    • 9. 发明授权
    • Clock synchronization between wireless devices during cradled time
    • 无线设备之间的时钟同步
    • US06587694B1
    • 2003-07-01
    • US09404807
    • 1999-09-24
    • Philip D. MooneyRichard L. McDowellJeffrey P. GrundvigJian Wu
    • Philip D. MooneyRichard L. McDowellJeffrey P. GrundvigJian Wu
    • H04L2730
    • H04M1/72502
    • Clocks between at least two wireless devices are synchronized to reduce the need to transmit synchronization signals over a wireless communication channel therebetween. Two wireless devices synchronize their respective clocks with each other when each are electrically coupled, e.g., during a cradle time when brought into physical contact with each other through charge contacts, e.g., to recharge a remote portable unit. The charge signal appearing at the charge contacts is driven to create a time duration marked by a start transition and an end transition in the charge signal. The number of clock pulses of each of the two wireless devices during the time duration is counted, and compared to determine the difference in clock speeds of the wireless devices. The frequency of the clock of at least one of the wireless devices is adjusted to bring the difference in the clock speeds within a predetermined threshold tolerance level.
    • 在至少两个无线设备之间的时钟被同步以减少通过它们之间的无线通信信道发送同步信号的需要。 两个无线设备在每个电耦合时使其各自的时钟彼此同步,例如在通过充电触点进行物理接触的支架时间期间,例如为远程便携式单元充电。 驱动出现在充电触点处的充电信号以产生由充电信号中的开始转换和结束转换所标记的持续时间。 对持续时间内的两个无线设备中的每一个的时钟脉冲数进行计数,并进行比较以确定无线设备的时钟速度的差异。 调整至少一个无线设备的时钟的频率以使时钟速度的差异在预定的阈值容差水平内。
    • 10. 发明授权
    • Real-time slow drift correction of alignment of handset's local oscillator for cordless telephone
    • 用于无绳电话的手机本地振荡器对准的实时慢漂移校正
    • US06650874B1
    • 2003-11-18
    • US09447286
    • 1999-11-23
    • Somnath BanikJoseph M. CannonEric J. DiethornJeffrey P. GrundvigJames A. JohansonRichard L. McDowellPhilip D. MooneyJian Wu
    • Somnath BanikJoseph M. CannonEric J. DiethornJeffrey P. GrundvigJames A. JohansonRichard L. McDowellPhilip D. MooneyJian Wu
    • H04B100
    • H04M1/727H04L7/0083H04L7/0331H04M1/72505
    • A method and apparatus to perform a real-time drift correction of a remote handset's local oscillator in a digital cordless telephone. The remote handset begins in a standby (sniff) mode. The remote handset periodically wakes from a sleep mode and goes into a normal link verification mode. Once in the link verification mode, the remote handset enters a time division duplexing (TDD) mode and attempts to establish a link with a base unit based on the timing of the TDD data frame. After the remote handset establishes a link with the base unit, the remote handset requests a security word from the base unit. Upon receiving the requested security word, the remote handset determines if the requested security word matches a security word of the remote handset. The remote handset implements a software frequency adjustment of its local oscillator. Once per frame, the remote handset enters a timing recovery state where the current state of the frame is compared with a previous state. When the cumulative timing slip is greater than a designated threshold, a frequency adjustment is made. During this exchange of commands between the remote handset and base unit, the remote handset continuously adjusts its local oscillator to achieve frequency alignment within, e.g., 1 part per million (ppm). Alternatively, frequency alignment may be achieved to a specified value.
    • 一种用于在数字无绳电话中执行远程手机的本地振荡器的实时漂移校正的方法和装置。 远程手机开始处于待机(嗅探)模式。 远程手机周期性地从休眠模式唤醒并进入正常的链路验证模式。 一旦处于链路验证模式,远程手机进入时分双工(TDD)模式,并尝试基于TDD数据帧的定时建立与基本单元的链路。 在远程手机与基本单元建立链接之后,远程手机从基本单元请求安全字。 在接收到所请求的安全字时,远程手机确定所请求的安全字是否与远程手机的安全字匹配。 远程手机实现其本地振荡器的软件频率调整。 每帧一次,远程手机进入定时恢复状态,其中帧的当前状态与先前状态进行比较。 当累积定时滑差大于指定的阈值时,进行频率调整。 在远程手机和基站单元之间的这种命令交换期间,远程手持机连续地调整其本地振荡器以实现例如百万分之一(ppm)内的频率对准。 或者,可以将频率对准实现为指定值。