公开(公告)号：US5673307A

公开(公告)日：1997-09-30

申请号：US198943

申请日：1994-02-17

Applicant: Bruce M. Holland ,  Gary L. Bliss ,  Bryan Edwards

Inventor： Bruce M. Holland ,  Gary L. Bliss ,  Bryan Edwards

IPC: H04W36/30 ,  H04Q7/22 ,  H04Q7/38

CPC classification number: H04W36/30

Abstract: A method, system, and apparatus for communication and handoff in a cellular phone system in which candidate cell units which can support communication with a mobile phone are identified. Neighbor cell units which have recently supported communication with the mobile phone are also identified. Handoff threshold values for each candidate cell are determined based on the existing communication quality and whether the candidate cell is also a neighbor cell such that the handoff threshold is higher when the candidate cell is a neighbor cell. A decision to handoff is made when the improvement offered by candidate cell is greater than the handoff threshold.

Abstract translation: 一种蜂窝电话系统中的通信和切换的方法，系统和装置，其中识别出可以支持与移动电话的通信的候选小区单元。 最近也支持与移动电话的通信的邻居小区单元也被识别。 基于现有通信质量以及候选小区是否也是相邻小区来确定每个候选小区的切换阈值，使得当候选小区是相邻小区时切换阈值较高。 当候选小区提供的改进大于切换阈值时，进行切换的决定。

公开(公告)号：US5177765A

公开(公告)日：1993-01-05

申请号：US709691

申请日：1991-06-03

Applicant: Bruce M. Holland ,  Gary L. Bliss

Inventor： Bruce M. Holland ,  Gary L. Bliss

IPC: H04B1/7075 ,  H04B1/7085

CPC classification number: H04B1/70756 ,  H04B1/7085

Abstract: A system and method of driect-sequence spread-spectrum TDMA (or TDD) digital communication, wherein acquisition and tracking occurs for a plurality of frames having a predetermined number of time slots. One of the predetermined number of time slots in each frame is assigned for acquisition purposes and carries acquisition and sync digital information. The remaining time slots in each frame have assigned header bytes for tracking purposes. The assigned acquisition time slot is spread with an acquisition direct-sequence spreading code. The remaining time slots are spread with a communication direct-sequence spreading code. During acquisition, the signal strength in each successive time slot for each spread frame is measured for a given number of time frames. The peak is located within the given number of time frames through a major acquistion sweep and a refinement sweep. The major acquisition sweep and refinement acquisition sweep locate the frame and time slot boundaries of the transmitted signal. Once acquired, tracking occurs during the header bytes of each successive remaining time slot. Acquisition, tracking and demodulation of the digital data is performed with the same circuitry.

Abstract translation: 一种干扰序列扩频TDMA（或TDD）数字通信的系统和方法，其中针对具有预定数量时隙的多个帧发生采集和跟踪。 每帧中预定数量的时隙中的一个被分配用于采集目的并且携带采集和同步数字信息。 每帧中剩余的时隙分配了头字节用于跟踪。 分配的采集时隙用采集直接序列扩展码扩展。 剩余的时隙用通信直接序列扩展码扩展。 在采集期间，对于给定数量的时间帧，测量每个扩展帧的每个连续时隙中的信号强度。 峰值通过​​主要的获取扫描和细化扫描位于给定数量的时间范围内。 主要采集扫描和细化采集扫描定位发射信号的帧和时隙边界。 一旦获得，跟踪发生在每个连续的剩余时隙的标题字节期间。 使用相同的电路来执行数字数据的采集，跟踪和解调。

公开(公告)号：US5177766A

公开(公告)日：1993-01-05

申请号：US709600

申请日：1991-06-03

Applicant: Bruce M. Holland ,  Gary L. Bliss

Inventor： Bruce M. Holland ,  Gary L. Bliss

IPC: H04B1/707

CPC classification number: H04B1/707

Abstract: A unique method and system is disclosed for generating digital clock timing in a receiver for use in direct-sequence spread-spectrum digital communication systems wherein spread data is delivered from a transmitter to a receiver. The present invention provides at the transmitter frames of digital communication data with each frame having a plurality of time slots and with each time slot having a plurality of digital bits. The transmitter utilizes direct-sequence spreading codes for spreading the digital bits in the time frame. The direct sequence spreading codes each have the same fixed sequence length of M chips and, furthermore, the number of chips per bit CB to spread each digital bit is constant and fully aligned with each digital bit. The ration of M:CB is an integer and the ratio of time of each time slot to the time of the M chips also equals an integer. The spread frames of digital information are despread at the receiver with receiver provided identical direct-sequence codes. The digital clock timing is generated from the receiver's pseudo random sequence generator. Bit timing equals CB*8, nibble timing equals 4*CB, and byte timing equals CB.

Abstract translation: 公开了用于在接收机中产生数字时钟定时的独特方法和系统，用于直接序列扩频数字通信系统，其中扩展数据从发射机传送到接收机。 本发明在数字通信数据的发射机帧中提供每个帧具有多个时隙，并且每个时隙具有多个数字比特。 发射机利用直接序列扩展码在时间帧内扩展数字比特。 直接序列扩展码各自具有相同的M个码片的固定序列长度，此外，扩展每个数字比特的每比特CB的码片数是恒定的并且与每个数字比特完全对齐。 M：CB的比例是整数，每个时隙的时间与M个码片的时间的比率也等于一个整数。 数字信息的扩展帧在接收机处被解扩，接收机提供相同的直接序列码。 从接收机的伪随机序列发生器产生数字时钟定时。 位定时等于CB * 8，半字节定时等于4 * CB，字节定时等于CB。