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    • 62. 发明授权
    • Sending pilots on secondary channels for improved acquisition and handoff in cellular communication
    • 在二级通道上发送导频,以改善蜂窝通信中的采集和切换
    • US08335202B2
    • 2012-12-18
    • US11941907
    • 2007-11-16
    • Rajat PrakashFatih Ulupinar
    • Rajat PrakashFatih Ulupinar
    • H04J1/00
    • H04W48/12H04W36/00H04W48/08H04W74/00
    • Systems and methodologies are described that facilitate enhancing acquisition and handoff in a wireless network deployment by leveraging primary pilots and secondary pilots. The deployment can support more than one frequency band for operation, yet a mobile device can receive signals on one frequency band at a given time. Thus, a base station can transmit primary pilot(s) over frequency band(s) associated with operating data channel(s) as well as secondary pilot(s) over frequency band(s) that lack data channel(s) for the base station. Moreover, the base station can convey information that indicates to a mobile device whether each pilot is primary or secondary. Further, the mobile device can employ knowledge of pilot type (e.g., primary or secondary) as well as signal strength to effectuate handoff decisions; thus, disruptions in communication can be mitigated.
    • 描述了通过利用主要飞行员和辅助飞行员来促进无线网络部署中的采集和切换的系统和方法。 该部署可以支持多个频带进行操作,但移动设备可以在给定时间在一个频带上接收信号。 因此,基站可以在与操作数据信道相关联的频带上发送主导频,以及在缺少用于基站的数据信道的频带上的辅助导频 站。 此外,基站可以向移动设备传送指示每个飞行员是主要还是次要的信息。 此外,移动设备可以使用导频类型(例如,初级或次级)的知识以及信号强度来实现切换决定; 从而可以缓解通信中断。
    • 64. 发明授权
    • Reference signal management in mobile systems
    • 移动系统中的参考信号管理
    • US08208920B2
    • 2012-06-26
    • US12349399
    • 2009-01-06
    • Hemanth SampathJeremy H. LinKurt W. OtteRajat Prakash
    • Hemanth SampathJeremy H. LinKurt W. OtteRajat Prakash
    • H04W4/00H04W36/00H04B1/38
    • H04W36/0083H04W36/14H04W48/12H04W52/0229Y02D70/00Y02D70/1222Y02D70/1242Y02D70/1262Y02D70/142Y02D70/146Y02D70/164
    • A reference signal management (RSM) program executing on a mobile device detects multiple reference signals, allocates those reference signals into groups, and performs reference signal management functions using information conveyed in the reference signals. The RSM program detects both broadband and narrowband reference signals and maintains updated groups of reference signals that are transmitted from access points with independent configurations or different radio technologies. Battery power of the mobile device is efficiently used to manage reference signals in heterogeneous network environments by preventing unnecessary handoffs, overhead downloads, access probes and new registrations. Reference signals are managed from both synchronous and asynchronous sectors and in idle mode as well as in connected state mode. The RSM program performs functions such as managing handoffs between access points, managing an idle mode of the mobile device, managing an active group of the detected reference signals, and collecting overhead parameters for the mobile device.
    • 在移动设备上执行的参考信号管理(RSM)程序检测多个参考信号,将这些参考信号分组,并使用在参考信号中传送的信息来执行参考信号管理功能。 RSM程序检测宽带和窄带参考信号,并维护从具有独立配置或不同无线电技术的接入点发送的更新的参考信号组。 通过防止不必要的切换,开销下载,接入探测和新的注册,移动设备的电池功率被有效地用于在异构网络环境中管理参考信号。 参考信号由同步和异步扇区以及空闲模式以及连接状态模式进行管理。 RSM程序执行诸如管理接入点之间的切换,管理移动设备的空闲模式,管理检测到的参考信号的活动组以及收集移动设备的开销参数的功能。
    • 70. 发明申请
    • DECLARING RADIO LINK FAILURE BASED ON TARGET-SPECIFIC THRESHOLD
    • 基于目标特定阈值声明无线链路故障
    • US20100124172A1
    • 2010-05-20
    • US12618105
    • 2009-11-13
    • Nathan E. TennyParag A. AgasheRajat Prakash
    • Nathan E. TennyParag A. AgasheRajat Prakash
    • H04L12/26H04W36/00
    • H04W24/08H04W36/36
    • The number of handover-related failures that occur in a communication system may be reduced by taking target access point conditions into account when declaring radio link failure and/or by delaying certain handover operations. In some aspects, criteria for radio link failure detection and access terminal-controlled mobility may take into account access point parameters related to neighboring cells that may be available as mobility targets. For example, filtering mechanisms for detecting radio link failure based on radio layer problem reports may also take into account the availability of various neighbor access points and their measured signal strengths. In addition, a handover command may be sent earlier than in conventional systems (e.g., the handover command may be sent even though the target access point is weaker than the source access point) and include an indication that instructs the access terminal to delay handover until a specified condition is met. For example, handover may be delayed until the target access point becomes stronger than the source access point.
    • 在宣告无线电链路故障和/或通过延迟某些切换操作时,通过考虑目标接入点条件可以减少在通信系统中发生的切换相关故障的数量。 在一些方面,用于无线电链路故障检测和接入终端控制的移动性的标准可以考虑与可能作为移动目标可用的相邻小区相关的接入点参数。 例如,用于基于无线电层问题报告检测无线电链路故障的过滤机制还可以考虑各种相邻接入点的可用性及其测量的信号强度。 此外,切换命令可以比传统系统更早发送(例如,即使目标接入点比源接入点更弱,也可以发送切换命令),并且包括指示接入终端延迟切换的指示,直到 满足指定条件。 例如,可以延迟切换,直到目标接入点变得比源接入点更强。