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：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：US09750046B2

公开(公告)日：2017-08-29

申请号：US14779176

申请日：2014-04-03

申请人： Hua-Min Chen ,  Pei-Kai Liao ,  Xiangyang Zhuang

发明人： Hua-Min Chen ,  Pei-Kai Liao ,  Xiangyang Zhuang

IPC分类号： H04W4/00 ,  H04W72/12 ,  H04L5/00 ,  H04W88/02

CPC分类号： H04W72/1289 ,  H04L5/0044 ,  H04L5/0091 ,  H04W88/02

摘要： A method includes: determining a first set of radio resources by decoding a dynamic indicator channel, wherein the dynamic indicator channel indicates a location of the first set of radio resources detecting a physical control channel in the determined first set of radio resources; and obtaining scheduling information of a data channel that carries a message from the decoded physical control channel.

公开(公告)号：US08861430B2

公开(公告)日：2014-10-14

申请号：US13570717

申请日：2012-08-09

申请人： Pei-Kai Liao ,  Chih-Yuan Lin

发明人： Pei-Kai Liao ,  Chih-Yuan Lin

IPC分类号： H04B7/185 ,  H04B7/06 ,  H04W72/08 ,  H04B7/02 ,  H04W24/10

CPC分类号： H04W72/085 ,  H04B7/024 ,  H04B7/0626 ,  H04W24/10

摘要： Procedures for point association as well as measurement and feedback required to enable point association for CoMP deployment scenario 4 are proposed. In a first novel aspect, a serving eNB configures a first higher-layer configuration for RSRP measurement to be used by a UE for serving point selection. The higher-layer configuration contains multiple CSI-RS configurations, and each CSI-RS configuration indicates a set of resource elements (REs) or subcarriers in both frequency domain and time domain as one CSI-RS resource with non-zero transmission power. The UE then performs RSRP measurements based on the multiple CSI-RS configurations and reports RSRP measurement results to the serving eNB. In a second novel aspect, the serving eNB configures a second higher-layer configuration for CSI reporting based on the reported RSRP measurement results. In a third novel aspect, the serving eNB sends CSI-RS information to the UE for uplink power control.

摘要翻译： 提出了点关联的程序以及启用CoMP部署场景4的点关联所需的测量和反馈。 在第一新颖的方面，服务eNB配置用于RSRP测量的第一高层配置以由UE用于服务点选择。 较高层配置包含多个CSI-RS配置，并且每个CSI-RS配置指示频域和时域中的一组资源元素（RE）或子载波，作为具有非零传输功率的一个CSI-RS资源。 然后，UE基于多个CSI-RS配置执行RSRP测量，并向服务eNB报告RSRP测量结果。 在第二个新颖的方面，服务eNB基于报告的RSRP测量结果来配置用于CSI报告的第二较高层配置。 在第三个新颖的方面，服务eNB向UE发送CSI-RS信息以进行上行链路功率控制。

公开(公告)号：US08737299B2

公开(公告)日：2014-05-27

申请号：US13134857

申请日：2011-06-20

申请人： Pei-Kai Liao

发明人： Pei-Kai Liao

IPC分类号： H04W4/00 ,  H04L5/00

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

摘要： An efficient uplink HARQ feedback channel resource allocation scheme is adopted for carrier aggregation in a multi-carrier LTE/LTE-A system. Two resource allocation schemes (e.g., explicit and hybrid) for HARQ ACK/NACK (A/N) are applied. Part of the resources is allocated based on explicit method via RRC configuration. Another part of the resources is allocated based on hybrid method via both RRC and implicit information carried by downlink schedulers. In an explicit method, the physical resource for A/N feedback information is determined based on a resource index in a DL scheduling grant. The DL grant corresponds to transport blocks over a configured CC. The resource index points to a physical resource from a set of candidate uplink A/N physical resources reserved for the CC. In an implicit method, the A/N physical resources are determined based on a logical address of the DL scheduling grant.

摘要翻译： 在多载波LTE / LTE-A系统中采用有效的上行HARQ反馈信道资源分配方案进行载波聚合。 应用用于HARQ ACK / NACK（A / N）的两种资源分配方案（例如，显式和混合）。 通过RRC配置，基于显式方法分配部分资源。 资源的另一部分是通过RRC和由下行链路调度器携带的隐式信息基于混合方法分配的。 在显式方法中，基于DL调度授权中的资源索引来确定用于A / N反馈信息的物理资源。 DL授权对应于配置的CC上的传输块。 资源索引从为CC保留的一组候选上行链路A / N物理资源指向物理资源。 在隐式方法中，基于DL调度授权的逻辑地址来确定A / N物理资源。

公开(公告)号：US08724718B2

公开(公告)日：2014-05-13

申请号：US12384754

申请日：2009-04-08

申请人： Chih-Yuan Lin ,  Pei-Kai Liao

发明人： Chih-Yuan Lin ,  Pei-Kai Liao

IPC分类号： H04B3/10

CPC分类号： H04L5/0048 ,  H04L5/0023

摘要： In OFDMA wireless communications systems, pilot pattern design is optimized based on predefined resource block size. The number of pilots and the spacing between pilots within a resource block is determined based on a set of system requirements. In one novel aspect, if resource block size is smaller than three in either frequency or time domain, then the pilots are allocated such that average pilot-to-data distance is minimized and that pilot-to-pilot distance is as large as possible. In one example, m pilots are allocated in an i×j resource block. The resource block is partitioned into n equal sub blocks, where m is a multiple of n. Within each sub block, m/n pilots are positioned such that average pilot-to-data distance is minimized. On the other hand, if resource block size is larger than or equal to three in both frequency and time domain, then pilots are allocated to avoid channel extrapolation.

摘要翻译： 在OFDMA无线通信系统中，基于预定义的资源块大小来优化导频模式设计。 基于一组系统要求确定资源块内的导频数和导频间距。 在一个新颖的方面，如果在频率或时域中资源块大小小于3，则分配导频，使得平均导频到数据距离最小化，并且导频到导频的距离尽可能大。 在一个示例中，m个导频被分配在i×j个资源块中。 资源块被划分成n个相等的子块，其中m是n的倍数。 在每个子块内，m / n导频被定位成使得平均导频到数据距离被最小化。 另一方面，如果在频域和时域中资源块大小都大于或等于3，则分配导频以避免信道外推。

公开(公告)号：US08724717B2

公开(公告)日：2014-05-13

申请号：US12384705

申请日：2009-04-08

申请人： Chih-Yuan Lin ,  Pei-Kai Liao

发明人： Chih-Yuan Lin ,  Pei-Kai Liao

IPC分类号： H04K1/10

CPC分类号： H04L5/0048 ,  H04L5/0023

摘要： In OFDMA wireless communications systems, pilot pattern design is optimized based on predefined resource block size. The number of pilots and the spacing between pilots within a resource block is determined based on a set of system requirements. In one novel aspect, in a high-rank MIMO system, pilots are allocated within a resource block to avoid channel extrapolation in frequency domain only. Because high-rank MIMO only supports low-mobility environment, time-domain extrapolation is no longer a dominant factor. For uplink transmission, one or more frequency tones at one or more edges of the resource block are reserved to be pilot-free to reduce multiuser synchronization error effect. When continuous resource blocks are jointly used for channel estimation, the upper and lower edges of each resource block are left with blanks such that edge pilots of adjacent resource blocks are not too close to each other to improve channel estimation.

摘要翻译： 在OFDMA无线通信系统中，基于预定义的资源块大小来优化导频模式设计。 基于一组系统要求确定资源块内的导频数和导频间距。 在一个新颖的方面，在高阶MIMO系统中，导频被分配在资源块内以避免仅在频域中的信道外推。 由于高阶MIMO仅支持低移动性环境，所以时域外推不再是主导因素。 对于上行链路传输，资源块的一个或多个边缘处的一个或多个频率音调被保留为无导频，以减少多用户同步误差效应。 当连续资源块共同用于信道估计时，每个资源块的上边缘和下边缘都留有空白，使得相邻资源块的边缘导频彼此不太靠近以改善信道估计。

公开(公告)号：US08503420B2

公开(公告)日：2013-08-06

申请号：US12655523

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： H04B7/208

CPC分类号： H04L5/0051 ,  H04L5/0007 ,  H04L5/0062 ,  H04L25/0226 ,  H04L2025/03796

摘要： In wireless OFDMA systems, sounding channels are allocated within predefined resource blocks. In a distributed sounding channel allocation scheme, a sounding channel is allocated to meet various design considerations. First, sounding signals do not collide with original pilots transmitted in the same resource block by other mobile stations to achieve good quality channel estimation. Second, sounding pattern does not affect data transmission behavior of other mobile stations in the same resource block. Third, sounding pattern consistency among multiple tiles within each resource block is maintained so that mobile stations do not need to implement additional data mapping rules. In a symbol-based sounding channel allocation scheme, a sounding channel is allocated in the first or the last OFDM symbol of a resource block, while the remaining consecutive OFDM symbols are used for data transmission. The symbol-based sound channel naturally satisfies all design considerations.

摘要翻译： 在无线OFDMA系统中，在预定义的资源块内分配探测信道。 在分布式探测信道分配方案中，分配探测信道以满足各种设计考虑。 首先，探测信号不与其他移动台在同一资源块中传输的原始导频相冲突，以实现良好质量的信道估计。 其次，探测模式不影响同一资源块中其他移动台的数据传输行为。 第三，保持每个资源块内的多个瓦片之间的探测模​​式一致性，使得移动台不需要实现附加的数据映射规则。 在基于符号的探测信道分配方案中，在资源块的第一个或最后一个OFDM符号中分配探测信道，而剩余的连续OFDM符号用于数据传输。 基于符号的声音通道自然满足所有设计考虑。