-
公开(公告)号：US5680395A
公开(公告)日：1997-10-21
申请号：US515501
申请日：1995-08-15
CPC分类号： H04W36/0066 , H04W48/12
摘要： A method and apparatus for providing a reliable means to perform handoff from a code division multiple access (CDMA) system using a pilot signal to an alternative access technique system. Simple pilot box circuitry is added to a set of border base stations. The border base stations are base stations which operate only in the alternative access technique and which have coverage areas which are contiguous with coverage areas of CDMA operation base stations. The mobile unit monitors for the pilot signal from the border base stations in the same manner as it monitors for pilot signals from the CDMA operation base stations. When the mobile unit detects the pilot signal corresponding to a border base station, it notifies a system controller in accordance with standard operation. The system controller is aware that the pilot signal corresponds to a border base station and thus triggers a hard handoff process to the alternative access technique system in response thereto. The border base stations use a time division duplex technique to monitor a pilot and synchronization sequence from a neighboring one of the CDMA operation base stations to obtain an estimate of absolute system time.
摘要翻译： 一种用于提供从使用导频信号到替代接入技术系统的码分多址（CDMA）系统执行切换的可靠装置的方法和装置。 简单的导频箱电路被添加到一组边界基站。 边界基站是仅在替代接入技术中工作的基站，其具有与CDMA操作基站的覆盖区域相邻的覆盖区域。 移动单元以与监视来自CDMA操作基站的导频信号相同的方式监视来自边界基站的导频信号。 当移动单元检测到与边界基站相对应的导频信号时，它根据标准操作通知系统控制器。 系统控制器知道导频信号对应于边界基站，并因此触发对另一种接入技术系统的硬切换过程。 边界基站使用时分双工技术来监视来自相邻的CDMA操作基站的导频和同步序列，以获得绝对系统时间的估计。
-
2.发明授权Method and apparatus for providing mobile unit assisted hard handoff from a CDMA communication system to an alternative access communication system 失效提供从CDMA通信系统到替代的接入通信系统的移动单元辅助硬切换的方法和装置
公开(公告)号：US5594718A
公开(公告)日：1997-01-14
申请号：US413306
申请日：1995-03-30
CPC分类号： H04W36/0066 , H04W48/12
摘要： A method and system for providing a reliable means to perform handoff from a code division multiple access (CDMA) system using a pilot signal to an alternative access communication technique system. Simple pilot box circuitry is added to a set of border base stations. The border base stations are base stations which operate only in the alternative access communication technique and which have coverage areas which are contiguous with coverage areas of CDMA operation base stations. The mobile unit monitors for the pilot signal from the border base stations in the same manner as it monitors for pilot signals from the CDMA operation base stations. When the mobile unit detects the pilot signal corresponding to a border base station, it notifies a system controller in accordance with standard operation. The system controller is aware that the pilot signal corresponds to a border base station and thus triggers a hard handoff process to the alternative access communication technique system in response thereto.
摘要翻译： 一种用于提供从使用导频信号的码分多址（CDMA）系统到替代的接入通信技术系统执行切换的可靠装置的方法和系统。 简单的导频箱电路被添加到一组边界基站。 边界基站是仅在替代接入通信技术中工作的基站，其具有与CDMA操作基站的覆盖区域相邻的覆盖区域。 移动单元以与监视来自CDMA操作基站的导频信号相同的方式监视来自边界基站的导频信号。 当移动单元检测到与边界基站相对应的导频信号时，它根据标准操作通知系统控制器。 系统控制器知道导频信号对应于边界基站，从而触发对其进行的替代接入通信技术系统的硬切换过程。
-
公开(公告)号：US5802105A
公开(公告)日：1998-09-01
申请号：US347526
申请日：1994-11-30
IPC分类号： H04L1/00 , H04B3/46 , H04B7/26 , H04B17/00 , H04L1/20 , H04L1/24 , H04L27/00 , H04L29/08 , H04L29/14
CPC分类号： H04L1/20 , H04L1/241 , H04L1/242 , H04L2027/0034
摘要： A system and method for testing signal transmission quality within a digital communication system is disclosed herein. The system may be incorporated within a digital cellular communication system in which information is exchanged over spread spectrum communication channels, among a plurality of mobile users, via at least one cell-site. The system contemplates testing a digital communication channel by transmitting a test sequence of digital data over the communication channel. The test sequence of digital data transmitted over the communication channel is received at a receiving station, within which is also generated a replica of the test sequence of digital data. The accuracy of transmission over the communication channel is then determined by comparing the replica of the test sequence of digital data to the test sequence of data received over the communication channel. The system allows the test sequence of digital data to be transmitted at one of a set of known data rates, with the receive station being disposed to identify the data rate associated with each test sequence of digital data. In a preferred implementation transmission of the test sequence involves generating a first plurality of data packets, which collectively comprise the test sequence of digital data. Each data packet is assigned one of a multiplicity of data rates in accordance with a first pseudorandom process, and is then transmitted at the data rate assigned thereto.
摘要翻译： 本文公开了一种用于测试数字通信系统内的信号传输质量的系统和方法。 该系统可以并入到数字蜂窝通信系统中，其中通过至少一个小区站点在多个移动用户之间通过扩频通信信道交换信息。 该系统考虑通过在通信信道上发送数字数据的测试序列来测试数字通信信道。 通过通信信道发送的数字数据的测试序列在接收站处被接收，在接收站中也产生数字数据的测试序列的副本。 然后通过将数字数据的测试序列的副本与通过通信信道接收的数据的测试序列进行比较来确定通信信道上的传输的准确性。 该系统允许数字数据的测试序列以一组已知数据速率中的一种传输，其中接收站被设置为识别与数字数据的每个测试序列相关联的数据速率。 在优选实施例中，测试序列的传输涉及生成第一多个数据分组，其共同地包括数字数据的测试序列。 每个数据分组根据第一伪随机过程分配多个数据速率中的一个，然后以分配给它的数据速率发送。
-
4.发明授权Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 失效用于减少在CDMA蜂窝通信系统中同时访问基站的移动站之间的消息冲突的装置和方法公开(公告)号：US07426391B2
公开(公告)日：2008-09-16
申请号：US11622403
申请日：2007-01-11
IPC分类号： H04Q7/20
CPC分类号： H04W74/0841 , H04B1/707 , H04B1/7103 , H04B7/2628 , H04B2201/709709 , H04J13/0022 , H04J13/10 , H04J13/16 , H04L1/188 , H04L1/1887 , H04W52/48 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0833 , H04W74/0866
摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.
摘要翻译： 通过在接收机的可用资源上分发传输来减少由多个扩频发射机同时发送的消息之间的冲突。 CDMA系统中的每个移动站使用一种或多种随机化方法来分发其传输。 在第一次随机化中，移动台通过PN码的多个码片对其发送进行时间延迟，并通过该芯片扩展发送的信号。 在第二随机化中，移动台随机选择PN码。 在第三随机化中，如果移动台在预定的超时时段之后没有接收到确认，则在连续的消息传输或探测之间插入随机延迟。 预定数量的这种传输被称为探测序列。 在第四随机化中，如果移动台在序列中没有接收到任何探测器的确认，则在连续探测序列之间插入相对长的随机延迟。
-
公开(公告)号：US06985728B2
公开(公告)日：2006-01-10
申请号：US10457962
申请日：2003-06-10
CPC分类号： H04W74/0841 , H04B1/707 , H04B1/7103 , H04B7/2628 , H04B2201/709709 , H04J13/0022 , H04J13/10 , H04J13/16 , H04L1/188 , H04L1/1887 , H04W52/48 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0833 , H04W74/0866
摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.
-
6.发明授权Mobile station assisted soft handoff in a CDMA cellular communications system 失效移动台在CDMA蜂窝通信系统中辅助软切换
公开(公告)号：US5640414A
公开(公告)日：1997-06-17
申请号：US226222
申请日：1994-04-11
摘要： In a code division multiple access (CDMA) spread spectrum cellular communication system in which a mobile station user communicates with another system user via at least one base station, wherein each base station transmits a common pilot signal of a different code phase with respect to other base stations in said system, a method for directing communications between said mobile station user and said base stations. The mobile station monitors the signal strength of pilots and reports the measured signal strength to a system controller via the base station through which it is communicating. Command messages from the system controller to a new base station and the mobiles station establishes communication through the new base station in addition to the communication through the current base station. When the mobile station detects the falling below a predetermined level of the signal strength of a pilot corresponding to at least one of the base stations through which the mobile station is communicating, the mobile station reports the measured signal strength indicative of the corresponding base station to the system controller via the base stations through which it is communicating. Command messages from the system controller to the identified base station and the mobiles station terminates communication through the corresponding base station while communications through the other base station or base stations continue.
摘要翻译： 在码分多址（CDMA）扩频蜂窝通信系统中，移动台用户经由至少一个基站与另一系统用户通信，其中每个基站相对于其他基站发送不同码相位的公共导频信号 所述系统中的基站，用于指导所述移动站用户与所述基站之间的通信的方法。 移动台监视导频的信号强度，并通过其正在通信的基站将系统控制器的测量信号强度报告给系统控制器。 除了通过当前基站的通信之外，从系统控制器到新基站和移动站的命令消息也建立通过新基站的通信。 当移动站检测到低于与移动台正在通信的至少一个基站相对应的导频的信号强度的预定级别的下降时，移动站将指示相应基站的测量信号强度报告给 系统控制器通过其正在通信的基站。 从系统控制器到所识别的基站和移动站的命令消息通过相应的基站终止通信，同时通过其他基站或基站的通信继续。
-
7.发明授权Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 失效用于减少在CDMA蜂窝通信系统中同时访问基站的移动站之间的消息冲突的装置和方法
公开(公告)号：US5544196A
公开(公告)日：1996-08-06
申请号：US219867
申请日：1994-03-30
IPC分类号： H04B1/707 , H04B1/7103 , H04B7/26 , H04J13/00 , H04J13/10 , H04J13/16 , H04L1/16 , H04L12/28 , H04L12/403 , H04L12/413 , H04L27/30 , H04W28/04 , H04W52/48 , H04W52/50 , H04W74/00 , H04W74/08 , H04B1/69 , H04J13/04
CPC分类号： H04W74/0841 , H04B1/707 , H04B1/7103 , H04B7/2628 , H04J13/0022 , H04J13/10 , H04J13/16 , H04L1/1887 , H04W52/48 , H04W52/50 , H04W74/0833 , H04B2201/709709 , H04L1/188 , H04W74/002 , H04W74/08 , H04W74/0866 , Y02B60/50
摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. The transmitters may be mobile stations and the receiver may be a base station in a CDMA cellular telephone system. Each mobile station uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time--delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. A hash function produces the number from an identification number uniquely associated with that mobile station. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence. The noise level is reduced by minimizing transmission power. The mobile station increments the power of successive probes within each probe sequence. The first probe of each probe sequence is transmitted at a predetermined level.
摘要翻译： 通过在接收机的可用资源上分发传输来减少由多个扩频发射机同时发送的消息之间的冲突。 发射机可以是移动台，并且接收机可以是CDMA蜂窝电话系统中的基站。 每个移动台使用一种或多种随机化方法来分发其传输。 在第一次随机化中，移动台通过PN码的多个码片对其发送进行时间延迟，并通过该芯片扩展发送的信号。 散列函数从与该移动站唯一相关联的识别号码产生数字。 在第二随机化中，移动台随机选择PN码。 在第三次随机化中，如果移动台在预定的超时时段之后没有接收到确认，则在连续的消息传输或探测之间插入随机延迟。 预定数量的这种传输被称为探测序列。 在第四随机化中，如果移动台在序列中没有接收到任何探测器的确认，则在连续探测序列之间插入相对长的随机延迟。 通过最小化传输功率降低噪声电平。 移动台在每个探测序列内递增连续探测的能力。 每个探针序列的第一探针以预定水平传输。
-
8.发明授权Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 失效用于减少在CDMA蜂窝通信系统中同时访问基站的移动站之间的消息冲突的装置和方法公开(公告)号：US07734260B2
公开(公告)日：2010-06-08
申请号：US11622383
申请日：2007-01-11
IPC分类号： H04B1/04
CPC分类号： H04W74/0841 , H04B1/707 , H04B1/7103 , H04B7/2628 , H04B2201/709709 , H04J13/0022 , H04J13/10 , H04J13/16 , H04L1/188 , H04L1/1887 , H04W52/48 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0833 , H04W74/0866
摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.
摘要翻译： 通过在接收机的可用资源上分发传输来减少由多个扩频发射机同时发送的消息之间的冲突。 CDMA系统中的每个移动站使用一种或多种随机化方法来分发其传输。 在第一次随机化中，移动台通过PN码的多个码片对其发送进行时间延迟，并通过该芯片扩展发送的信号。 在第二随机化中，移动台随机选择PN码。 在第三次随机化中，如果移动台在预定的超时时段之后没有接收到确认，则在连续的消息传输或探测之间插入随机延迟。 预定数量的这种传输被称为探测序列。 在第四随机化中，如果移动台在序列中没有接收到任何探测器的确认，则在连续探测序列之间插入相对长的随机延迟。
-
公开(公告)号：US5504773A
公开(公告)日：1996-04-02
申请号：US171146
申请日：1993-12-21
IPC分类号： H04B1/707 , H04B1/7075 , H04B1/7115 , H04B7/005 , H04B7/26 , H04J3/16 , H04J3/22 , H04J3/24 , H04J11/00 , H04J13/00 , H04J13/18 , H04L1/00 , H04L1/08 , H04L5/02 , H04L5/12 , H04L7/04 , H04L23/02 , H04B1/69 , G06F11/00
CPC分类号： H04L1/0057 , H04B1/707 , H04B1/70757 , H04B7/2618 , H04B7/2628 , H04B7/2637 , H04J13/00 , H04J3/16 , H04J3/1688 , H04J3/22 , H04J3/24 , H04L1/0059 , H04L1/0065 , H04L1/0068 , H04L1/0071 , H04L1/08 , H04L23/02 , H04L5/02 , H04L5/12 , H04L7/048 , H04B1/7115 , H04B2201/70701 , H04B2201/70703 , H04J13/0048 , H04J13/18 , H04W52/26
摘要： In a digital communication system in which digital data is transmitted in data frames of a preselected time duration, a method and apparatus for formatting digital data in each data frame. A set of data bits of a first data type having a bit count corresponding to one of a plurality of predetermined bit counts are provided. A set of parity check bits for the set of data bits of said first data type are generated when the bit count is a highest bit count or a next to highest bit count. A set of tail bits is generated in accordance with a predetermined frame termination format. In respective order the set of data bits of the first data type, the parity check bits, and the tail bits are porovided in a data frame if the bit count is of the highest bit count or of the next to highest bit count. Otherwise, the set of data bits of the first data type and the tail bits are provided in respective order in the data frame.
摘要翻译： 在数字数据在预选持续时间的数据帧中发送的数字通信系统中，在每个数据帧中格式化数字数据的方法和装置。 提供具有对应于多个预定位计数之一的位计数的第一数据类型的一组数据位。 当比特计数是最高比特数或下一个最高比特数时，产生用于所述第一数据类型的数据比特组的一组奇偶校验位。 根据预定的帧终止格式生成一组尾比特。 如果比特数是最高比特数或下一个到最高比特数，则在相应的顺序中，如果第一数据类型，奇偶校验位和尾比特的数据比特的数据比特被排列在数据帧中。 否则，在数据帧中以相应的顺序提供第一数据类型和尾比特的数据比特组。
-
10.发明授权
公开(公告)号：US5509015A
公开(公告)日：1996-04-16
申请号：US206701
申请日：1994-03-07
IPC分类号： H04J3/16 , H04B1/16 , H04B7/26 , H04W24/00 , H04W48/08 , H04W52/02 , H04W56/00 , H04W72/04 , H04W72/12 , H04W74/04
CPC分类号： H04B1/1615 , H04W52/0216 , H04W52/0219 , H04B2201/70709 , H04W24/00 , H04W56/00 , H04W68/02 , H04W72/04 , H04W72/0413 , H04W72/12 , H04W74/04 , Y02B60/50
摘要： A system for reducing receiver power consumption in communication system having a transmitter and one or more receivers schedules periodic messages in "slots." Each receiver is assigned a slot during which it monitors the transmissions. The transmitter transmits messages to the receiver only during the assigned slots. The receiver is in an "active state" during its assigned slot. It may remain in the active state after its assigned slot if the message requires the receiver to perform additional actions. During the "inactive state," which is the time period between successive occurrences of its assigned slot, the receiver may perform any action not requiring coordination with the transmitter. It may conserve power during this time by removing power from one or more components such as those used for monitoring the transmissions. At a time during the inactive state shortly before the assigned slot, the receiver applies power to these components and performs initializations. Such initializations may include reacquiring a pilot channel signal to which the receiver may synchronize itself if its timing signals have drifted out of synchronization with those of the transmitter during the preceding inactive state.
摘要翻译： 具有发射机和一个或多个接收机的通信系统中的接收机功率消耗的系统在“时隙”中调度周期性消息。 每个接收机被分配一个时隙，在该时隙中它监视传输。 发射机仅在分配的时隙期间向接收机发送消息。 接收机在其分配的时隙中处于“活动状态”。 如果消息要求接收方执行其他操作，则可能在其分配的时隙之后保持活动状态。 在“不活动状态”期间，其是其分配时隙的连续出现之间的时间段，接收机可以执行不需要与发射机协调的任何动作。 它可以在此期间通过从一个或多个组件（例如用于监视传输的组件）中的电力来节省电力。 在分配时隙之前的非活动状态期间，接收机对这些组件施加功率并执行初始化。 这样的初始化可以包括重新获取导频信道信号，如果接收机的定时信号在前一个非活动状态期间已经与发射机的定时信号漂移不同步，则其可以同步其自身。
-
-
-
-
-
-
-
-
-
搜索结果
274 条记录 (耗时 0.041 秒)
