公开(公告)号：EP0768769A3

公开(公告)日：1999-06-30

申请号：EP96307354.9

申请日：1996-10-09

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Paratore, Bernardo ,  Mullins, Robert Patrick ,  Gittings, Michael J. ,  Clark, Dennis R.

IPC分类号： H04J3/06 ,  H04B10/213

CPC分类号： H04J3/0655 ,  H04J3/0682

摘要： In a Time Division Multiple Access (TDMA) communication network (10), a central office (CO) (11) provides interactive communication between a service provider and a plurality of user terminals (32). To synchronize transmissions of the user terminals, a timebase timer (20) in the CO generates modulo N-bit cyclical reference counts as time markers. In a downstream direction to the plurality of user terminals, time marker insertion units (16) in the CO receive both (a) separate digital TDMA transport streams having a predetermined data rate including data packets and Media Access Control (MAC) packets that are interspersed between the data packets at predetermined intervals, and (b) the time markers generated by the timebase timer, and insert a currently received time marker count into a concurrently received MAC packet. The resultant downstream TDMA transport streams with the inserted time marker counts in the MAC packets are transmitted in continuous TDMA output transport stream to the remote user terminals. The time markers are independent of a data rate, a physical channel, and a channel protocol of the transport stream. In each user terminal, a network interface module (34) synchronizes itself by comparing received time markers and locally generated time marker counts for correcting a local oscillator frequency. Upstream channel units (23) in the CO are synchronized using the timebase timer generated time markers for receiving and processing upstream data packets upon arrival at their preassigned channel unit.

公开(公告)号：EP0768769A2

公开(公告)日：1997-04-16

申请号：EP96307354.9

申请日：1996-10-09

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Paratore, Bernardo ,  Mullins, Robert Patrick ,  Gittings, Michael J. ,  Clark, Dennis R.

IPC分类号： H04J3/06 ,  H04B10/213

CPC分类号： H04J3/0655 ,  H04J3/0682

摘要： In a Time Division Multiple Access (TDMA) communication network (10), a central office (CO) (11) provides interactive communication between a service provider and a plurality of user terminals (32). To synchronize transmissions of the user terminals, a timebase timer (20) in the CO generates modulo N-bit cyclical reference counts as time markers. In a downstream direction to the plurality of user terminals, time marker insertion units (16) in the CO receive both (a) separate digital TDMA transport streams having a predetermined data rate including data packets and Media Access Control (MAC) packets that are interspersed between the data packets at predetermined intervals, and (b) the time markers generated by the timebase timer, and insert a currently received time marker count into a concurrently received MAC packet. The resultant downstream TDMA transport streams with the inserted time marker counts in the MAC packets are transmitted in continuous TDMA output transport stream to the remote user terminals. The time markers are independent of a data rate, a physical channel, and a channel protocol of the transport stream. In each user terminal, a network interface module (34) synchronizes itself by comparing received time markers and locally generated time marker counts for correcting a local oscillator frequency. Upstream channel units (23) in the CO are synchronized using the timebase timer generated time markers for receiving and processing upstream data packets upon arrival at their preassigned channel unit.

摘要翻译： 在一个时分多址（TDMA）通信网络（10），一个中心局（CO）（11）提供了一个服务提供者和用户终端的多个（32）之间的交互通信。 同步的用户终端的传输，在CO基因率时间基准计时器（20）模N位循环引用计数作为时间标记。 在下游方向上向用户终端，时间标记插入单元在CO多元性（16）同时接收（a）具有预定的数据速率包括数据包和媒体访问控制（MAC）分组单独的数字TDMA传输流并散布 以预定的间隔将数据分组，和（b）之间通过时基计时器生成的时间标记，并插入一个当前接收时间标记计数转换为同时接收的MAC包。 与所述MAC包被插入的时间标记计数所得下游TDMA传输流是在连续TDMA输出的传送流反式mitted到远程用户终端。 时间标记是一个独立的数据速率，物理信道，并且传输流的信道协议。 在每个用户终端，网络接口模块（34），通过比较接收到的时间标记和本地产生的时间标记计数用于校正本地振荡器频率同步本身。 上游信道单元（23）中的CO所使用的时基定时器生成的时间标记在预分配他们的信道单元到达时接收和处理上行数据分组同步。