公开(公告)号：US20100246508A1

公开(公告)日：2010-09-30

申请号：US12655520

申请日：2009-12-30

申请人： Yu-Hao Chang ,  Pei-Kai Liao

发明人： Yu-Hao Chang ,  Pei-Kai Liao

IPC分类号： H04W72/04

CPC分类号： H04L5/0053 ,  H04L27/2602 ,  H04L27/2656 ,  H04W56/00

摘要： In advanced wireless OFDMA communication systems, hierarchical synchronization is adopted to synchronize between a base station (BS) and a mobile station (MS). In a hierarchical synchronization architecture, primary advanced preamble (PA-Preamble) is used for coarse time domain synchronization while cell ID is detected using several accumulated secondary advanced preambles (SA-Preambles). Network entry latency can be reduced by adjusting the relative location of superframe header (SFH), PA-Preamble and SA-Preambles within a superframe. Three different synchronization channel (SCH) architectures are proposed to provide different tradeoffs between network entry latency and the robustness of SA-Preamble design and cell ID detection.

摘要翻译： 在先进的无线OFDMA通信系统中，采用分层同步来在基站（BS）和移动台（MS）之间进行同步。 在分层同步架构中，主要的高级前同步码（PA-Preamble）用于粗略的时域同步，同时使用几个累加的辅助高级前导码（SA-前导码）来检测小区ID。 可以通过调整超帧中的超帧头（SFH），PA前导码和SA-前导码的相对位置来减少网络进入延迟。 提出了三种不同的同步信道（SCH）架构，以提供网络入口延迟与SA前导码设计和小区ID检测的鲁棒性之间的不同权衡。

公开(公告)号：US20100165942A1

公开(公告)日：2010-07-01

申请号：US12655515

申请日：2009-12-30

申请人： Pei-Kai Liao ,  Yu-Hao Chang ,  Kuo-Ming Wu

发明人： Pei-Kai Liao ,  Yu-Hao Chang ,  Kuo-Ming Wu

IPC分类号： H04W88/16 ,  H04W72/04 ,  H04L27/28

CPC分类号： H04L5/005 ,  H04L27/2601 ,  H04W56/0015 ,  H04W72/04

摘要： A hierarchical downlink (DL) synchronization channel (SCH) is provided for wireless OFDM/OFDMA systems. The SCH includes a Primary SCH (P-SCH) for carrying PA-Preambles used for coarse timing and frequency synchronization, and a Secondary SCH (S-SCH) for carrying SA-Preambles used for cell ID detection. The total time length occupied by P-SCH and S-SCH is equal to one OFDM symbol time length of a data channel, and S-SCH is located in front of P-SCH in each DL frame. A perfect multi-period time-domain structure is created and maintained in P-SCH to increase preciseness of frame boundary estimation. With overlapping deployment of macrocells and femtocells, a predefined SCH configuration scheme is provided to separate frequency subbands used for macrocells and femtocells such that interferences in S-SCH can be mitigated. In addition, a self-organized SCH configuration scheme is provided to allow more flexibility for femtocells to avoid or introduce interference in S-SCH.

摘要翻译： 为无线OFDM / OFDMA系统提供分层下行链路（DL）同步信道（SCH）。 SCH包括用于携带用于粗定时和频率同步的PA前导的主SCH（P-SCH）和用于携带用于小区ID检测的SA-前导的辅SCH（S-SCH）。 由P-SCH和S-SCH占用的总时间长度等于数据信道的一个OFDM符号时间长度，并且S-SCH位于每个DL帧中的P-SCH前面。 在P-SCH中创建并保持了完美的多周期时域结构，以增加帧边界估计的精确度。 通过宏单元和毫微微小区的重叠部署，提供预定义的SCH配置方案来分离用于宏小区和毫微微小区的频率子带，从而可以减轻S-SCH中的干扰。 另外，提供了自组织的SCH配置方案，以允许毫微微小区更灵活地避免或引入S-SCH中的干扰。