公开(公告)号：US08855044B2

公开(公告)日：2014-10-07

申请号：US12930453

申请日：2011-01-07

申请人： Pei-Kai Liao ,  Yih-Shen Chen ,  Kuhn-Chang Lin ,  York Ted Su

发明人： Pei-Kai Liao ,  Yih-Shen Chen ,  Kuhn-Chang Lin ,  York Ted Su

IPC分类号： H04B7/212 ,  H04J3/06 ,  H04W56/00 ,  H04W48/16 ,  H04W48/08 ,  H04W84/04 ,  H04W28/04

CPC分类号： H04W56/0045 ,  H04W28/04 ,  H04W48/08 ,  H04W48/16 ,  H04W56/0015 ,  H04W84/045

摘要： A two-step uplink synchronization method is provided for uplink synchronization between a mobile station and a pico/femto base station that is deployed together with an overlay macro/micro base station. In a first step, the pico/femto BS encodes and broadcasts UL transmission timing advance offset information via a broadcast channel. The MS decodes the received UL transmission timing advance offset information and advances its uplink timing for uplink ranging or reference signal transmission based on the decoded offset value. In a second step, the MS and the pico/femto BS performs regular uplink synchronization and uplink access. In one example, the UL transmission timing advance offset information indicates a round-trip propagation time of radio signals between the pico/femto base station and the overlay macro/micro base station. By using the two-step uplink synchronization method, a unified synchronous ranging channel may be used for ranging and UL access in pico/femtocells with reduced interference.

摘要翻译： 提供了两步上行同步方法，用于与覆盖宏/微基站一起部署的移动台和微微/毫微微基站之间的上行链路同步。 在第一步中，微微/毫微微BS经由广播信道编码和广播UL传输定时提前偏移信息。 MS对所接收的UL传输定时提前偏移信息进行解码，并基于解码的偏移值推进其上行链路测距或参考信号传输的上行链路定时。 在第二步中，MS和微微/毫微微BS执行常规的上行链路同步和上行链路接入。 在一个示例中，UL传输定时提前偏移信息指示微微/毫微微基站和重叠宏/微基站之间的无线电信号的往返传播时间。 通过使用两步上行同步方法，统一的同步测距信道可以用于具有减小的干扰的微微/毫微微小区中的测距和UL接入。

公开(公告)号：US08811300B2

公开(公告)日：2014-08-19

申请号：US12655524

申请日：2009-12-30

申请人： Chih-Yuan Lin ,  Pei-Kai Liao

发明人： Chih-Yuan Lin ,  Pei-Kai Liao

IPC分类号： H04W4/00

CPC分类号： H04J11/005 ,  H04L5/0007 ,  H04L5/005 ,  H04L27/261 ,  H04L2025/03796

摘要： In wireless OFDMA systems, midamble is used to facilitate downlink (DL) channel estimation. Midamble signals are transmitted by a base station via a midamble channel allocated in a DL subframe. In a novel symbol-based midamble channel allocation scheme, a midamble channel is allocated in the first or the last OFDM symbol of multiple resource blocks of the subframe, while the remaining consecutive OFDM symbols are used for data transmission. The symbol-based midamble channel provides good coexistence between midamble signals and pilot signals without inducing additional limitation or complexity. Under a novel midamble channel and sequence arrangement, both code sequence and either time-domain or frequency-domain location degrees-of-freedom are considered such that the required number of midamble sequences is substantially smaller than the number of strong interferences. In addition, different midamble sequences are systematically generated based on a base sequence such that the receiving mobile station does not need to memorize all the different code sequences.

摘要翻译： 在无线OFDMA系统中，使用midamble来促进下行链路（DL）信道估计。 Midamble信号由基站经由在DL子帧中分配的中置码信道发送。 在一种新颖的基于符号的中间码信道分配方案中，在子帧的多个资源块的第一个或最后一个OFDM符号中分配一个中继码信道，而其余的连续的OFDM符号用于数据传输。 基于符号的中置码信道在中置信号和导频信号之间提供良好的共存，而不会引起额外的限制或复杂性。 在新颖的中间码信道和序列排列下，考虑码序列和时域或频域位置自由度，使得所需数量的中继码序列显着小于强干扰数。 此外，基于基本序列系统地生成不同的中间码序列，使得接收移动台不需要记住所有不同的代码序列。

公开(公告)号：US08660107B2

公开(公告)日：2014-02-25

申请号：US13134862

申请日：2011-06-20

申请人： Pei-Kai Liao

发明人： Pei-Kai Liao

IPC分类号： H04J1/00

CPC分类号： H04L5/0055 ,  H04L1/1614 ,  H04L1/1861 ,  H04L1/1896 ,  H04L5/0007 ,  H04L5/001 ,  H04L5/0082 ,  H04L5/0094

摘要： HARQ feedback channel design for carrier aggregation (CA) is proposed in a multi-carrier LTE/LTE-A system. In one novel aspect, a predefined rule for HARQ feedback channel format switching is adopted by the system. Different HARQ formats are supported: single component carrier (non-CA) mode, carrier aggregation with small payload size (CA-S) mode, carrier aggregation with large payload size (CA-L) mode, and fallback mode. From the various CA and non-CA formats, the format to be used for uplink HARQ feedback channel is determined based on: UE capability for the maximum number of CCs supported; CC configuration information by RRC layer; and detection results of downlink schedulers. The CC configuration information may include the number of CCs that are configured and a specific HARQ format to be used. Because more reliable upper layer configuration is used to make the HARQ format-switching decision, the risk of UE and eNB mismatch is greatly reduced.

摘要翻译： 在多载波LTE / LTE-A系统中提出了载波聚合（CA）的HARQ反馈信道设计。 在一个新颖的方面，系统采用HARQ反馈信道格式切换的预定义规则。 支持不同的HARQ格式：单分量载波（non-CA）模式，小负载大小（CA-S）模式的载波聚合，大的有效负载大小（CA-L）模式的载波聚合和回退模式。 从各种CA和非CA格式，基于以下方式确定用于上行链路HARQ反馈信道的格式：UE支持的最大CC数量; CC层配置信息; 和下行调度器的检测结果。 CC配置信息可以包括被配置的CC的数量和要使用的特定的HARQ格式。 由于使用更可靠的上层配置来进行HARQ格式切换决策，所以UE和eNB不匹配的风险大大降低。

公开(公告)号：US20110170497A1

公开(公告)日：2011-07-14

申请号：US12930454

申请日：2011-01-07

申请人： Chih-Yuan Lin ,  Pei-Kai Liao

发明人： Chih-Yuan Lin ,  Pei-Kai Liao

IPC分类号： H04W72/04

CPC分类号： H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0091 ,  H04W72/042

摘要： A method of multi-antenna resource allocation for uplink channel sounding in a wireless communication system is provided. A base station (eNB) first selects a number of sounding reference signal (SRS) parameters. The eNB then determines each selected SRS parameter for a first antenna of a user equipment (UE) having multiple antennas. The determined parameters are jointly encoded to a first set of parameter combination using a number of signaling bits. The eNB transmits the signaling bits for the first antenna to the UE without transmits additional signaling bits for other antennas. The UE receives the signaling bits for SRS resource allocation for the first antenna and derives a second set of parameter combination for a second antenna based on a predetermined rule. By implicitly signaling SRS resource allocation for multiple antennas, it is easy for the eNB to allocate SRS resource for different antennas of different UEs with reduced overhead.

摘要翻译： 提供了一种用于无线通信系统中的上行链路信道探测的多天线资源分配方法。 基站（eNB）首先选择多个探测参考信号（SRS）参数。 然后，eNB确定用于具有多个天线的用户设备（UE）的第一天线的每个所选择的SRS参数。 所确定的参数使用多个信令位联合编码为第一组参数组合。 eNB向第一天线发送用于第一天线的信令比特，而不发送用于其他天线的附加信令比特。 UE接收用于第一天线的SRS资源分配的信令比特，并且基于预定规则导出第二天线的第二组参数组合。 通过隐含地发送用于多个天线的SRS资源分配，eNB可以容易地以减少的开销为不同UE的不同天线分配SRS资源。

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。

公开(公告)号：US20100150100A1

公开(公告)日：2010-06-17

申请号：US12653360

申请日：2009-12-11

申请人： Yih-Shen Chen ,  Pei-Kai Liao

发明人： Yih-Shen Chen ,  Pei-Kai Liao

IPC分类号： H04W72/04

CPC分类号： H04L27/2607 ,  H04L5/0007 ,  H04L5/0053 ,  H04L5/0073 ,  H04L27/2655 ,  H04W56/0005

摘要： A unified synchronous ranging channel is provided. The unified synchronous ranging channel has a ranging cyclic prefix length that is the same as a cyclic prefix length of a data channel. The unified synchronous ranging channel is used for one of initial ranging, handover ranging, and periodic ranging between a mobile station and a femto base station. In one embodiment, the synchronous ranging channel spans over a two-dimensional radio resource region having a first number of subcarriers along frequency domain, a second number of OFDM symbols along time domain, and a third number of time-domain repetition. At the transmit side, a ranging code sequence is generated by applying a fixed time-domain cyclic shift per OFDM symbol to a root sequence. At the receive side, the ranging code sequence is decoded by using a summation module, a likelihood-combining module, and a modified peak test module that normalizes a peak value.

摘要翻译： 提供统一的同步测距通道。 统一同步测距信道具有与数据信道的循环前缀长度相同的测距循环前缀长度。 统一的同步测距信道用于移动台和毫微微基站之间的初始测距，切换测距和周期性测距之一。 在一个实施例中，同步测距信道跨越沿着频域具有第一数量子载波的二维无线电资源区，沿时域的第二数量的OFDM符号和第三数量的时域重复。 在发送侧，通过对根序列应用每OFDM符号的固定时域循环移位来生成测距码序列。 在接收侧，通过使用求和模块，似然合成模块和归一化峰值的修改峰值测试模块对测距代码序列进行解码。

公开(公告)号：US20100150099A1

公开(公告)日：2010-06-17

申请号：US12653336

申请日：2009-12-11

申请人： Yih-Shen Chen ,  Pei-Kai Liao

发明人： Yih-Shen Chen ,  Pei-Kai Liao

IPC分类号： H04W72/04

CPC分类号： H04L27/2607 ,  H04L5/0007 ,  H04L5/0053 ,  H04L5/0073 ,  H04L27/2655 ,  H04W56/0005

摘要： A unified synchronous ranging channel is provided. The unified synchronous ranging channel has a ranging cyclic prefix length that is the same as a cyclic prefix length of a data channel. The unified synchronous ranging channel is used for one of initial ranging, handover ranging, and periodic ranging between a mobile station and a femto base station. In one embodiment, the synchronous ranging channel spans over a two-dimensional radio resource region having a first number of subcarriers along frequency domain, a second number of OFDM symbols along time domain, and a third number of time-domain repetition. At the transmit side, a ranging code sequence is generated by applying a fixed time-domain cyclic shift per OFDM symbol to a root sequence. At the receive side, the ranging code sequence is decoded by using a summation module, a likelihood-combining module, and a modified peak test module that normalizes a peak value.

摘要翻译： 提供统一的同步测距通道。 统一同步测距信道具有与数据信道的循环前缀长度相同的测距循环前缀长度。 统一的同步测距信道用于移动台和毫微微基站之间的初始测距，切换测距和周期性测距之一。 在一个实施例中，同步测距信道跨越沿着频域具有第一数量子载波的二维无线电资源区，沿时域的第二数量的OFDM符号和第三数量的时域重复。 在发送侧，通过对根序列应用每OFDM符号的固定时域循环移位来生成测距码序列。 在接收侧，通过使用求和模块，似然合成模块和归一化峰值的修改峰值测试模块对测距代码序列进行解码。

公开(公告)号：US20100104036A1

公开(公告)日：2010-04-29

申请号：US12589449

申请日：2009-10-23

申请人： Pei-Kai Liao ,  Chih-Yuan Lin ,  Yih-Shen Chen

发明人： Pei-Kai Liao ,  Chih-Yuan Lin ,  Yih-Shen Chen

IPC分类号： H04K1/10

CPC分类号： H04L5/0023 ,  H04L1/0072 ,  H04L1/0631 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0094 ,  H04L25/0228

摘要： A contention-based multi-antenna access request transmission/receiving procedure in MIMO OFDM/OFDMA systems is provided to reduce access latency. A mobile station encodes and transmits an access request over a shared access channel using multiple transmitting antennas, while a base station receives and decodes a number of access requests using multiple receiving antennas. Each access request comprises an access indictor and an access message. In a first MIMO scheme, the mobile station transmits the access indicator as preambles, while the access message is encoded by SFBC/STBC to obtain spatial diversity. At the receive side, the access indicator is exploited as pilots for channel estimation. The access message is decoded using SFBC/STBC decoding algorithm. In a second MIMO scheme, the mobile station performs precoding/beamforming for each of the transmitting antenna to obtain beamforming gain, while the base station performs virtual beam matching based on the detection results of the access indicators.

摘要翻译： 提供MIMO OFDM / OFDMA系统中的基于竞争的多天线接入请求发送/接收过程以减少接入等待时间。 移动台通过使用多个发射天线的共享接入信道来编码和发送接入请求，而基站使用多个接收天线接收并解码多个接入请求。 每个访问请求包括访问指示符和访问消息。 在第一MIMO方案中，移动站将接入指示符作为前导码发送，而接入消息由SFBC / STBC编码以获得空间分集。 在接收端，接入指示器被用作信道估计的导频。 访问消息使用SFBC / STBC解码算法进行解码。 在第二MIMO方案中，移动台对于发射天线中的每一个执行预编码/波束成形，以获得波束成形增益，而基站基于访问指示符的检测结果执行虚拟波束匹配。

公开(公告)号：US20090202010A1

公开(公告)日：2009-08-13

申请号：US12369563

申请日：2009-02-11

申请人： I-Kang FU ,  Pei-Kai Liao

发明人： I-Kang FU ,  Pei-Kai Liao

IPC分类号： H04L27/28

CPC分类号： H04L25/03159 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/03343 ,  H04L25/03821 ,  H04L27/2626 ,  H04L27/2657

摘要： A method of aligning sub-carriers of radio signals of two adjacent frequency channels and devices therefor are described. The method comprises aligning a first plurality of sub-carriers of a first radio signal and a second plurality of sub-carriers of a second radio signal within an overlapped frequency region in-between the two adjacent frequency channels by shifting a center frequency of the first radio signal with a frequency offset. The first radio signal and the second radio signal are adapted for transmission over the two adjacent frequency channels and the first frequency channel is one of the two adjacent frequency channels.

摘要翻译： 描述了一种对准两个相邻频率信道的无线电信号的子载波的方法及其装置。 该方法包括通过将第一无线电信号的第一和第二多个子载波的中心频率移位，在第二相邻频率信道之间的重叠频率区域内对准第一无线电信号的第一多个子载波 具有频率偏移的无线电信号。 第一无线电信号和第二无线电信号适于在两个相邻频率信道上进行传输，而第一频道是两个相邻频道之一。