CN104303557B - 用于使用参考信号接收质量(rsrq)的切换增强的用户设备和方法 - Google Patents

用于使用参考信号接收质量(rsrq)的切换增强的用户设备和方法 Download PDF

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CN104303557B
CN104303557B CN201380024750.6A CN201380024750A CN104303557B CN 104303557 B CN104303557 B CN 104303557B CN 201380024750 A CN201380024750 A CN 201380024750A CN 104303557 B CN104303557 B CN 104303557B
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ttt
cell
a3offset
mobility state
rsrq
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CN104303557A (zh
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C·姚
张玉建
房慕娴
Y·彭
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Apple Inc
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Intel Corp
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    • H04B1/40—Circuits
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    • H04B1/56—Circuits using the same frequency for two directions of communication with provision for simultaneous communication in two directions
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Abstract

在本文通常描述了在无线网络中用于使用参考信号接收质量(RSRQ)的切换增强的用户设备(UE)的实施例和方法。在一些实施例中，UE至少部分地基于UE的速度自适应地选择切换发起参数。UE可确定服务小区的RSRQ和目标小区的RSRQ，并且当目标小区RSRQ超过服务小区RSRQ时，根据选择的切换发起参数，可将测量报告传输到服务eNB用于从服务小区切换到目标小区。在这些实施例的一些中，切换发起参数可包括偏移值例如包括A3offset‑TTT对的A3offset值和触发时间(TTT)。

Description

用于使用参考信号接收质量(RSRQ)的切换增强的用户设备和 方法
相关申请的交叉引用
本申请要求2012年12月28日提交的美国专利申请序列号No.13/631,213的优选权的利益，该专利申请要求2012年5月11日提交的美国临时专利申请序列号No.61/646,223的优选权的利益，这两个专利申请通过引用被全部并入本文。
技术领域
实施例涉及无线蜂窝通信。一些实施例涉及异构网络(HetNet)移动性。一些实施例涉及在小区之间的切换，包括在不同小区层的小区之间的切换。
背景技术
蜂窝通信网络的一个问题是确定移动设备何时应在小区之间切换(即，从服务小区到目标小区)。挑战之一是在无线电链路出故障之前执行切换。这在异构网络(HetNet)中特别是问题，其中小的小区被较大的小区覆盖。较高移动性设备使这些切换挑战变得越来越困难。
因此，存在对减小无线电链路故障率的改进的切换技术的一般需要。也存在对增加切换效率并以较少的开销操作的改进的切换技术的一般需要。也存在对减小无线电链路故障率，特别是对于快速移动和较高移动性移动设备的改进的切换技术的一般需要。也存在对适合于HetNet移动性的改进的切换技术的一般需要。
附图说明
图1示出根据一些实施例的蜂窝通信；
图2示出根据一些实施例的切换发起标准的例子；
图3示出根据一些实施例的参考信号位置；以及
图4是根据一些实施例的用户设备(UE)的方框图；
图5是根据一些实施例的适合于用于切换参数选择的表；以及
图6是根据一些实施例的UE切换的过程的流程图。
具体实施方式
下面的描述和附图充分示出特定的实施例以使本领域中的技术人员能够实施它们。其它实施例可合并结构、逻辑、电气、过程、以及其它变化。一些实施例的部分和特征可包括在其它实施例的部分和特征中或代替其它实施例的部分和特征。在权利要求中阐述的实施例包括那些权利要求的所有可用的等效形式。
图1示出根据一些实施例的蜂窝通信。基站例如增强或演进节点B(eNB)104向小区101内的通信设备例如用户设备(UE)102提供无线通信服务。基站例如eNB 106向小区103内的通信设备提供无线通信服务。基站例如eNB 108向小区105内的通信设备提供无线通信服务。在这个例子中，eNB 104可以是服务eNB。可执行从eNB 104到另一eNB例如eNB106或eNB108的切换，以在某个切换标准被满足时切换与UE 102的通信。
根据一些实施例，UE 102可配置成至少部分地基于UE 102的速度自适应地选择切换发起参数。在这些实施例中，UE 102可确定服务小区(即，小区101)的参考信号接收质量(RSRQ)和目标小区(即，小区103)的RSRQ。根据选择的切换发起参数，当目标小区RSRQ超过服务小区RSRQ时，UE 102可将测量报告传输到服务eNB 104用于从服务小区101切换到目标小区103。在这些实施例的一些中，切换发起参数可包括偏移值例如A3offset值和触发时间(TTT)。A3offset值和TTT可包括A3offset-TTT对。
在这些实施例中，使用UE 102的速度以选择切换发起参数(例如A3offset-TTT对)，和使用目标和服务小区103和101的RSRQ(例如代替参考信号接收功率(RSRP))以触发切换发起，可帮助减小切换失败率。下面更详细描述了这些实施例。
在一些实施例中，代替UE 102的速率或速度，可基于UE 102的移动性状态来选择切换发起参数。下面也更详细描述了这些实施例。
在一些实施例中，可基于服务小区类型和目标小区类型来选择切换发起参数。服务小区类型可包括宏小区或微微小区，且目标小区类型可包括宏小区或微微小区。在图1所示的例子中，小区101和103可以是宏小区，且eNB 104和106可以是宏eNB。小区105可以是微微小区，且eNB 108可以是微微eNB。下面也更详细描述了这些实施例。
在一些实施例中，可基于切换类型来选择切换发起参数。切换类型可包括宏到宏小区切换、微微到宏小区切换、宏到微微小区切换或微微到微微小区切换中的一个。下面也更详细描述了这些实施例。
在一些替代实施例中，可基于目标小区103的RSRQ和服务小区101的RSRQ来选择切换发起参数。在这些替代实施例中，UE 102可基于目标小区RSRQ来选择A3offset值并可基于服务小区RSRQ来选择TTT。在这些替代实施例中，可基于服务小区101的RSRQ和目标小区103的RSRQ而不是基于UE速度和/或切换类型来选择切换发起参数(例如A3offset-TTT对)。下面也更详细描述了这些实施例。
图2示出根据一些实施例的切换发起标准的例子。服务小区101(图1)可具有服务小区RSRQ 201，且目标小区例如目标小区103(图1)可具有目标小区RSRQ 203。在这个例子图示中，服务小区RSRQ 201和目标小区RSRQ 203可如所示改变，这可以是当移动站例如UE102(图1)相对于目标小区103在服务小区101内移动时的情况。如图2所示，当目标小区RSRQ203持续超过服务小区RSRQ 201至少A3offset值205(即，事件A3或A3event)并持续TTT207时，UE 102可将测量报告209传输到服务小区101的eNB 104。然后服务小区101的eNB104可做出切换决定并将切换请求发送到目标小区103的eNB 106.
如在本文使用的A3event(或事件A3)可以是当相邻小区的RSRQ(例如目标小区RSRQ 203)变成比主小区(PCell)的RSRQ(例如服务小区RSRQ 201)好的偏移量(即，A3offset值205)时出现的测量报告事件。在一些实施例中，A3event可以指根据3GPPT.S.36.331(第三代合作伙伴计划；技术规范组无线电接入网络；演进通用陆地无线接入(E-UTRA)；无线电资源控制(RRC)；协议规范(版本11))的“事件A3”，虽然这不是要求。在这些实施例中，当A3offset 205和TTT 207要求被满足时，事件A3触发测量报告209。
在一些实施例中，一组A3offset值和TTT连同一个或多个阈值可在无线电资源控制(RRC)连接建立(例如初始连接建立)时由eNB 104发送到UE 102。当UE 102进入A3event(即，A3offset条件成立)时，UE 102可锁定选择的A3offset值-TTT对，直到TTT时间为止。在A3event期满之后，UE 102可在UE 102退出A3event时将选择的A3offset值-TTT对解锁。在这些实施例中，当在A3event之外时，UE 102可基于速度或移动性状态动态地选择A3offset值-TTT对。
在一些实施例中，UE 102可抑制选择或重选A3offset值205和TTT 207。当目标小区RSRQ 203超过服务小区RSRQ 201当前选择的A3offset值205时，UE 102进入A3event并将测量报告209发送到服务小区101。可在A3event之外以有规律的方式执行A3offset-TTT对的A3offset值205和TTT207的选择和重选，并在A3event期间保持(即，不重选)选择的A3offset值205和TTT 207。
图3示出根据一些实施例的参考信号位置。在资源块300内的不同位置处示出参考信号302(被示为R0)。每个资源块(RB)300可包括资源元件301，其可包括在时间中的多个符号和在频率中的多个子载波。在一些实施例中，可根据包含参考信号302的RB的RSRP与接收信号强度指示(RSSI)之比来确定参考信号302的RSRQ。可基于资源块300的全部参考信号302的平均信号功率级来测量RSRP。
在一些实施例中，根据E-UTRAN LTE(例如TS 36.214)的3GPP标准来确定服务小区201的RSRQ和目标小区203的RSRQ。服务小区201的RSRQ和目标小区203的RSRQ可用于确定切换发起的事件A3的进入条件和离开条件。下面更详细描述了这些实施例。
在一些实施例中，对于较大的UE速度，选择较小的A3offset值205和较短的TTT207。对于较小的UE速度，选择较大的A3offset值205和较长的TTT 207。在这些实施例中，A3offset值205和TTT 207可与UE 102的速度或移动性状态反向相关。
在一些实施例中，UE 102的速度可基于UE 102的移动性状态，并可根据在预定的时间段期间小区重选的数量来确定，虽然实施例的范围并不被限制在这个方面中，因为其它移动性状态评估技术可被使用。在这些实施例中，基于小区重选的数量，UE 102可进入高移动性状态、中移动性状态或低移动性状态。在这些实施例中，可通过对小区重选进行计数来确定移动性状态(高、中和低)。UE 102可对在空闲模式中的小区重选进行计数或对在连接模式中的切换进行计数。在一些实施例中，如果在时间段TCRmax期间的小区重选的数量超过NCR_M且不超过NCR_H，则UE 102可以在中移动性(medium-mobility)状态中。如果在时间段TCRmax期间的小区重选的数量超过NCR_H，则UE 102可以在高移动性状态中，否则，UE 102可在低移动性状态中。在这些实施例中，对于UE 102的每个移动性状态，不同的A3offset-TTT对可由UE 102选择，虽然实施例的范围并不被限制在这个方面中。在一些实施例中，可基于在预定的时间段期间的小区重选的数量(而不是移动性状态)来选择A3offset-TTT对。在使用小区重选的数量来确定速度或移动性状态的一些实施例中，在相同的两个小区之间的连续重选不被计数。
在一些其它实施例中，可根据地点或位置评估的变化来确定UE 102的速度，其中所述地点或位置评估根据从包括目标eNB 106和服务eNB 104的一个或多个eNB传输的信号来确定。在这些实施例中，定时提前量可用于找到UE离包括服务eNB 104的一个或多个eNB的距离。在一些实施例中，相邻小区测量可用于增加准确度。在一些实施例中，可借助使用观察到达时间差(OTDOA)技术的三个或更多eNB的知识来三边测量UE的位置。在这些实施例中，在网络中的小区的定时和它们的地理位置可被传输，且至少两个其它小区相对于在UE102处的服务小区的时间差可被接收。在一些其它实施例中，可根据接收自一个或多个eNB的信号的多普勒频率来确定UE 102的速度。
在一些其它实施例中，可使用辅助卫星定位(例如A-GPS)技术来确定UE 102的速度。A-GPS技术可使用来自卫星的信号，包括全球定位系统(GPS)信号。在这些实施例中，UE102可具有用于从GPS卫星接收GPS信号并用于确定UE的速度的GPS接收机，虽然这不是要求，因为可使用用于速度确定的其它技术。
在一些实施例中，对于低于预定低值的速度，UE 102可从多个A3offset-TTT对选择第一A3offset-TTT对(例如off_low、ttt_low)。对于大于或等于预定低值及小于或等于预定高值的速度，UE 102可从多个A3offset-TTT对选择第二A3offset-TTT对(例如off_med、ttt_med)。对于高于预定高值的速度，UE 102可从多个A3offset-TTT对选择第三A3offset-TTT对(例如off_high、ttt_high)。在示例实施例中，速度的预定低值可以是大约4km/h，且预定高值可以是大约60km/h，虽然实施例的范围并不被限制在这个方面中。在这些示例实施例中，可对低于大约4km/h的UE速度选择第一A3offset-TTT对，可对从大约4km/h到大约60km/h的UE速度选择第二A3offset-TTT对，且可对大于大约60km/h的UE速度选择第三A3offset-TTT对，虽然实施例的范围并不被限制在这个方面中。
在其它示例实施例中，对于A3offset-TTT对的选择，可使用小区重选的数量，而不是速度值(例如km/h)。在一些实施例中，可通过小区重选的数量和小区尺寸来确定速度。
图4是根据一些实施例的UE的方框图。UE 400可适合于用作UE 102(图1)，虽然其它配置也可能是适当的。UE 400可包括用于通过一个或多个天线与eNB通信的物理层(PHY)层电路402。UE 400还可包括介质访问控制(MAC)层电路404以及处理电路406和存储器408。
根据一些实施例，处理电路406可配置成至少部分地基于UE 400的速度或移动性状态从多个切换发起参数选择切换发起参数。处理电路406可配置成确定服务小区201的RSRQ和目标小区203的RSRQ，且根据选择的切换发起参数，当目标小区RSRQ 203超过服务小区RSRQ 201时，PHY层电路402可配置成将测量报告209传输到服务eNB 104用于从服务小区101到目标小区103的切换发起。多个A3offset-TTT对可存储在UE 400的存储器408中。
在一些实施例中，UE 400可包括键盘、显示器、非易失性存储器端口、多个天线、图形处理器、应用处理器、扬声器、以及其它移动设备元件中的一个或多个。显示器可包括LCD屏幕，其包括触摸屏。由UE 400利用的一个或多个天线可包括一个或多个定向或全向天线，包括例如偶极子天线、单极天线、贴片天线、回路天线、微带天线或适合于RF信号的传输的其它类型的天线。在一些实施例中，不是两个或多个天线，而可以使用具有多个孔径的单个天线。在这些实施例中，每个孔径可被考虑为单独的天线。在一些多输入多输出(MIMO)实施例中，天线可有效地被分离以利用空间分集和可在每个天线和传输站的天线之间产生的不同的信道特征。在一些MIMO实施例中，天线可被分离多达波长的1/10或更多。
虽然UE 400被示为具有几个单独的功能元件，一个或多个功能元件可组合，并可通过软件配置的元件(例如包括数字信号处理器(DSP)的处理元件和/或其它硬件元件)的组合来实现。例如，一些元件可包括一个或多个微处理器、DSP、专用集成电路(ASIC)、射频集成电路(RFIC)和用于至少执行本文所述的功能的各种硬件和逻辑电路的组合。在一些实施例中，功能元件可以指在一个或多个处理元件上操作的一个或多个过程。
一些实施例可在硬件、固件和软件的一个或组合中实现。实施例也可被实现为存储在计算机可读存储介质上的指令，其可被读取和由至少一个处理器执行以执行本文描述的操作。计算机可读存储介质可包括用于以机器(例如计算机)可读的形式存储信息的任何非暂时性机构。例如，计算机可读存储介质可包括只读存储器(ROM)、随机存取存储器(RAM)、磁盘存储介质、光学存储介质、闪存设备、以及其它存储设备和介质。在这些实施例中，UE 400的一个或多个处理器可配置有执行本文描述的操作的指令。
在一些实施例中，处理电路406可包括一个或多个处理器，且物理层电路402可包括射频(RF)电路和基带电路。RF电路可包括接收机和发射机电路。接收机电路可将所接收的RF信号转换成基带信号，且基带电路可将基带信号转换成一个或多个位流。发射机电路可将一个或多个位流转换成基带信号，并将基带信号转换在成RF信号用于传输。
在一些实施例中，UE 400可配置成根据正交频分多址(OFDMA)通信技术通过多载波通信信道接收正交频分复用(OFDM)通信信号。OFDM信号可包括多个正交子载波。在一些宽带多载波实施例中，eNB(例如eNB104、106和108)(图1)可以是宽带无线接入(BWA)网络(例如第三代合作伙伴计划(3GPP)通用陆地无线接入网络(UTRAN)长期演进(LTE)或长期演进(LTE)通信网络)的部分，虽然实施例的范围并不被限制在这个方面中。在这些宽带多载波实施例中，UE 400和eNB可配置成根据3GPP-LTE的OFDMA技术进行通信。OFDMA技术可以是使用不同的上行链路和下行链路频谱的频域双工(FDD)技术或使用上行链路和下行链路相同频谱的时域双工(TDD)技术。
在一些LTE实施例中，无线资源的基本单元是物理资源块(PRB)，例如资源块300(图3)。PRB可包括在频域中的12个子载波x在时域中的0.5毫秒(ms)。PRB可被成对地分配(在时域中)。在这些实施例中，PRB可包括多个资源元件(RE)，例如RE 301(图3)。RE可包括一个子载波x一个符号，虽然这不是要求。
在一些实施例中，eNB可传输信道状态信息参考信号(CIS-RS)和/或公共参考信号(CRS)。这些参考信号302可在预定PRB中被传输，并可用于确定可用于计算RSRQ的RSRP，如上所述。在一些其它实施例中，可使用其它下行链路参考信号。
在一些实施例中，UE 400可以是便携式无线通信设备(例如个人数字助理(PDA)、具有无线通信能力的膝上型计算机或便携式计算机、网页平板计算机、无线电话、无线头戴式耳机、寻呼机、即时消息传送设备、数字照相机、接入点、电视机、医学设备(例如心率监控器、血压监控器等)或可无线地接收和/或传输信息的其它设备)的部分。
在一些LTE实施例中，UE 400可计算可用于执行闭环空间复用传输模式的信道适应的几个不同的反馈值。这些反馈值可包括信道质量指示符(CQI)、轶指示符(RI)和预编码矩阵指示符(PMI)。通过CQI，发射机选择几个调制字母和码率组合之一。RI通知发射机关于当前MIMO信道的有用传输层的数量，且PMI指示在发射机处应用的(根据发射天线的数量)预编码矩阵的码本索引。由eNB使用的码率可基于CQI。PMI可以是由UE400计算并被报告给eNB的矢量。在一些实施例中，UE 400可传输包含CQI/PMI或RI的格式2、2a或2b的物理上行链路控制信道(PUCCH)。
在这些实施例中，CQI可以是如UE 400所经历的下行链路移动无线电信道质量的指示。CQI允许UE 400向eNB提议最佳调制方案和编码率以用于给定的无线电链路质量，使得因而产生的传输块误差率将不超过某个值，例如10％。在一些实施例中，UE 400可报告宽带CQI值，其指系统带宽的信道质量。UE 400也可报告可由较高层配置的某个数量的资源块300的每子带的子带CQI值。子带的完全子集可覆盖系统带宽。在空间复用的情况下，可报告每码字CQI。
在一些实施例中，PMI可指示对于给定的无线电条件由eNB使用的最佳预编码矩阵。PMI值指码本表。网络配置由PMI报告表示的资源块300的数量。在一些实施例中，为了覆盖系统带宽，可提供多个PMI报告。也可为闭环空间复用、多用户MIMO和闭环轶1预编码MIMO模式提供PMI报告。
在一些协作多点(CoMP)实施例中，网络可配置成用于到UE 400的联合传输，其中两个或多个协作/协调点(例如远程无线电头(RRH))联合地传输。在这些实施例中，联合传输可以是MIMO传输，且协作点配置成执行联合波束成形。
如上面提到的，在一些实施例中，可基于服务小区类型和目标小区类型来选择切换发起参数。服务小区类型可包括宏小区或微微小区，且目标小区类型可包括宏小区或微微小区。在这些实施例中，使用服务和目标小区的类型以进一步选择A3offset-TTT对，和使用目标和服务小区的RSRQ(而不是RSRP)以触发切换发起可帮助减小切换失败率。
在这些实施例中，宏或宏切换包括从宏服务小区到宏目标小区的切换，微微到宏切换包括从微微服务小区到宏目标小区的切换，宏到微微切换包括从宏服务小区到微微目标小区的切换，且微微到微微切换包括从微微服务小区到微微目标小区的切换。在一些实施例中，微微小区可被考虑为微、微微或毫微微小区，并可存在于宏小区(如在图1中所示的)中。在这些实施例中，切换类型可包括宏到宏切换、微微到宏切换、宏到微微切换；以及微微到微微切换之一。
在这些实施例的一些中，可基于UE 400的速度和切换类型从表例如图5的表中选择A3offset-TTT对。表可存储在UE 400的存储器408中。
在这些实施例的一些中，UE 102可基于由服务小区101的eNB 104和/或目标小区(小区103或小区105)的eNB(eNB 106或eNB 108)传输的小区或eNB识别信息来确定服务小区类型和目标小区类型中的至少一个，该小区或eNB识别信息指示小区是宏小区还是微微小区。在一些实施例中，指示小区是宏小区还是微微小区的小区或eNB识别信息可被携带在LTE网络中的广播信道例如物理广播信道(PBCH)或物理下行链路共享信道(PDSCH)上，虽然这不是要求。
在一些实施例中，UE 102可基于由服务小区101的eNB和/或目标小区103或105的eNB传输的参考信号302的测量信号强度来确定服务小区类型和目标小区类型中的至少一个。在这些实施例中，由宏小区的eNB(即，宏eNB)传输的参考信号302的信号强度可明显大于由微微小区的eNB(即，微微eNB)传输的参考信号302的信号强度，允许UE 102确定小区类型，而不考虑UE 102是否在小区中心或小区边缘附近。在一些实施例中，服务小区101的eNB和/或目标小区103或105的eNB可传输可用于确定小区类型的信号强度的指示符。
在一些实施例中，对于从微微服务小区到宏目标小区的切换，选择(比如果只基于速度而选择的)更小的A3offset值和更小的TTT。对于从宏服务小区到微微目标小区的切换，选择(比如果只基于速度而选择的)更大的A3offset值205和更小的TTT 207。在这些实施例的一些中，在基于UE速度最初选择A3offset-TTT对之后，对从微微服务小区到宏目标小区的切换可以选择具有较小的A3offset值205和较小的TTT 207的A3offset-TTT对。在基于UE 102的速度最初选择A3offset-TTT对之后，对从宏服务小区到微微目标小区的切换可以选择具有较大的A3offset值205和较小的TTT207的A3offset-TTT对。在一些实施例中，可基于切换类型增加或降低A3offset值205和TTT 207。
在一些实施例中，对于在同一类型的小区之间的切换(即，宏到宏切换或微微到微微切换)，可使用基于速度最初选择的A3offset-TTT对的值，虽然这不是要求。在其它实施例中，对于在同样类型的小区之间的切换，可使用除了基于速度最初选择的A3offset-TTT对的值以外的值，例如在图5中示出的值。
在一些实施例中，可基于服务小区的尺寸和目标小区的尺寸(例如，而不是小区类型)中的至少一个从多个A3offset-TTT对中选择A3offset-TTT对。对于从较小的服务小区到较大的目标小区的切换，可选择较小的A3offset值205和较小的TTT 207。对于从较大的服务小区到较小的目标小区的切换，选择较大的A3offset值205和较小的TTT 207。
图6是根据一些实施例的用于UE切换的过程的流程图。过程600可由UE例如UE 102(图1)执行。
在操作602中，UE 102可基于UE 102的速度或移动性状态从多个A3offset-TTT对中选择A3offset-TTT对。在操作602之前，UE 102可确定其速度或移动性状态，如上所述。
在操作604中，UE 102可确定服务小区101的RSRQ和目标小区103或105的RSRQ。
在操作606中，当目标小区RSRQ 203超过服务小区RSRQ 201至少A3offset值205并持续TTT 207时，UE 102可产生测量报告209并将测量报告209传输到服务eNB(例如eNB104)用于从服务小区101到目标小区103或105的切换。
如上面提到的，在一些替代实施例中，可基于目标小区203和服务小区的RSRQ(而不是UE速度和/或切换类型)选择切换发起参数。在这些替代实施例中，UE 102可基于目标小区RSRQ 203选择A3offset值205，并可基于服务小区RSRQ 201选择TTT 207。在这些替代实施例中，选择A3offset值205可包括基于目标小区RSRQ 203和一个或多个RSRQ阈值选择多个A3offset值205之一。选择TTT 207可包括基于服务小区RSRQ 201和一个或多个RSRQ阈值选择多个TTT之一。
在这些实施例中，当目标小区RSRQ 203持续超过服务小区RSRQ 201至少选择的A3offset值205并持续选择的TTT 207时，可以发起从服务小区101(图1)到目标小区103(图1)的切换。在一些实施例中，A3offset值205可被选择为与目标小区RSRQ 203反向相关，且TTT 207可被选择为与服务小区RSRQ 201直接相关。
在一些实施例中，选择A3offset值205可包括基于目标小区RSRQ 203选择多个A3offset值(即，v1、v2或v3)之一。选择TTT 207可包括基于服务小区RSRQ 201选择多个TTT(t1、t2或t3)之一。在这些实施例中，可对较低的目标小区RSRQ 203选择较大的A3offset值205，且可对较高的目标小区RSRQ 203选择较小的A3offset值205。在这些实施例中，选择的A3offset值205与目标小区RSRQ 203成反比例或有关。A3offset值205可以以dB为单位，虽然实施例的范围并不被限制在这个方面中。
在一些实施例中，在目标小区RSRQ 203和服务小区RSRQ 201之间的差异(例如从测量的目标小区RSRQ 203减去测量的服务小区RSRQ 201)可被称为测量的A3offset。当测量的A3offset超过选择的A3offset值205时，A3event可出现。
在一些实施例中，可对较高的服务小区RSRQ 201选择较大的TTT 207，并可对较低的服务小区RSRQ 201选择较小的TTT 207。在这些实施例中，选择的TTT 207可与服务小区RSRQ 201直接相关或线性地成比例。TTT207可以以毫秒为单位，虽然实施例的范围并不被限制在这个方面中。
在一些实施例中，可在RRC连接建立时从eNB 104接收多个A3offset值和多个TTT。在一些实施例中，多个A3offset值和多个TTT可基于默认或初始A3offset值205和TTT 207。在一些实施例中，A3offset值205和TTT可在eNB 104和UE 102之间在RRC连接建立时由eNB104配置或确定，虽然这不是要求。在一些实施例中，可预先确定A3offset值和TTT。A3offset值和TTT可存储在UE 102中用于稍后的选择，如上所述。
在一些替代实施例中，多个A3offset值和多个TTT可基于默认或初始A3offset值205和TTT 207由UE 102产生。在这些替代实施例中，默认或初始A3offset值205和TTT 207可由eNB 104提供，虽然这不是要求。
在一些实施例中，当目标小区RSRQ 203大于RSRQ阈值(α)时可对A3offset值205选择第一A3offset值(v1)，当目标小区RSRQ 203不大于RSRQ阈值(α)时可对A3offset值205选择第二A3offset值(v2)。在这些实施例中，当服务小区RSRQ 201大于RSRQ阈值(α)时可对TTT 207选择第一TTT(t1)，当服务小区RSRQ 201不大于RSRQ阈值(α)时可对TTT 207选择第二TTT(t2)。第一A3offset值(v1)可小于第二A3offset值(v2)，且第一TTT(t1)可大于第二TTT(t2)。在这些实施例的一些中，第一A3offset值(v1)、第二A3offset值(v2)、第一TTT(t1)、第二TTT(t2)和RSRQ阈值(α)可在连接建立时由eNB 104提供。
在一些实施例中，目标小区RSRQ 203和服务小区RSRQ 201可分成多个级别(N)，其中N-1RSRQ阈值用于从N个A3offset值和N个TTT中选择。在使用三个级别(N＝3)的示例实施例中，当目标小区RSRQ 203大于第一RSRQ阈值(α)时可对A3offset值205选择第一A3offset值(v1)，当目标小区RSRQ 203大于第二RSRQ阈值(β)但不大于第一RSRQ阈值(α)时可对A3offset值205选择第二A3offset值(v2)，当目标小区RSRQ203不大于第二RSRQ阈值(β)时可对A3offset值205选择第三A3offset值(v3)。当服务小区RSRQ 201大于RSRQ阈值(α)时可对TTT 207选择第一TTT(t1)，当服务小区RSRQ 201大于第二RSRQ阈值(β)但不大于第一RSRQ阈值(α)时可对TTT 207选择第二TTT(t2)，以及当服务小区RSRQ 201不大于第二RSRQ阈值(β)时可对TTT 207选择第三TTT(t3)。第一A3offset值(v1)可小于第二A3offset值(v2)，第二A3offset值(v2)可小于第三A3offset值(v3)(即，v1<v2<v3)。第一TTT(t1)可大于第二TTT(t2)，第二TTT(t2)可大于第三TTT(t3)(即，t1>t2>t3)。在这些实施例中，第一、第二和第三A3offset值，第一、第二和第三TTT，以及第一和第二RSRQ阈值可在连接建立时由eNB 104提供。
在这些实施例中，第一RSRQ阈值(α)可大于第二RSRQ阈值(β)多达三个dB或更多，虽然实施例的范围并不被限制在这个方面中。在一些实施例中，N可以大于或等于二并小于五，虽然实施例的范围并不被限制在这个方面中，因为N可大于五。在一些实施例中，基于为以不同的速度移动的UE 102而执行的模拟，可以由系统确定RSRQ阈值(α，β)，以最小化或减小无线电链路故障并减小切换开销。
在N＝2的示例实施例中，单个RSRQ阈值和两个不同的A3offset值和两个不同的TTT可由eNB 104提供。对于N＝3，可提供两个RSRQ阈值、三个不同的A3offset值和三个不同的TTT。对于N＝4，可提供三个RSRQ阈值、四个不同的A3offset值和四个不同的TTT。在这些实施例中，UE 102可基于测量的目标和服务小区RSRQ及切换发起的RSRQ阈值来选择A3offset-TTT对。
在一些实施例中，当目标小区RSRQ 203持续超过服务小区RSRQ 201至少选择的A3offset值205并持续选择的TTT 207时，UE 102可将测量报告209(图2)发送或传输到服务eNB 104，用于由服务小区101的eNB 104做出潜在切换决定。测量报告209可包括至少目标小区103的小区标识符。可响应于测量报告209而执行切换。
在一些实施例中，测量报告209可包括服务小区RSRQ 201和在TTT定时器终止时测量的目标小区RSRQ 203。测量报告209还可包括其它相邻小区的RSRQ。在一些实施例中，测量报告209可被称为触发测量报告。在这些实施例的一些中，具有最大/最强RSRQ的相邻小区可被识别为目标小区103。测量报告209可按照小区的物理小区标识符(physcellid)识别小区，且在一些实施例中，可以包括小区的封闭用户组(CSG)标识。在一些替代实施例中，测量报告209可用于触发到目标小区103的切换，且可不必包括RSRQ值。
在一些替代实施例中，基于服务小区201的RSRQ和目标小区的RSRP而不是服务小区和目标小区两者的RSRQ来选择A3offset-TTT对。当目标小区RSRQ 203超过服务小区RSRQ201至少A3offset值205并持续TTT 207时，测量报告209可传输到eNB用于从服务小区切换到目标小区。可根据包含参考信号302的资源块300的RSRP与RSSI之比来确定RSRQ。在这些实施例中，可基于目标小区RSRP和一个或多个RSRP阈值(例如(α1，β1))从多个A3offset值中选择A3offset值205。可基于服务小区RSRQ 201和一个或多个RSRQ阈值(例如(α2，β2))从多个TTT之一选择TTT 207。
摘要被提供以符合需要允许读者确定技术公开的性质和要点的摘要的37C.F.R.章1.72(b)。在不被用于限制或解释权利要求的范围或意义的理解下将其提交。下面的权利要求特此并入具体实施方式中，每个权利要求独立地作为单独的实施例。

Claims (22)

1.一种由用户设备(UE)执行的用于根据速度的小区重选的方法，所述方法包括：
基于所述UE的移动性状态并且进一步基于服务小区类型和目标小区类型中的一个或多个，选择用于切换的A3offset-TTT对，其中所述A3offset-TTT对包括A3offset值和触发时间(TTT)；
根据包含参考信号的资源块(RB)的参考信号接收功率(RSRP)与接收信号强度指示(RSSI)之比来确定服务小区的参考信号接收质量(RSRQ)和目标小区的RSRQ；以及
当目标小区RSRQ超过服务小区RSRQ至少所述A3offset值并持续所述TTT时，基于所选择的A3offset-TTT对将测量报告传输到服务增强节点B(eNB)以用于从所述服务小区切换到所述目标小区。
2.如权利要求1所述的方法，其中根据由eNB在预定的物理资源块(PRB)中传输的信道状态信息参考信号(CIS-RS)和公共参考信号(CRS)中的一个或多个来确定所述RSRP。
3.如权利要求1所述的方法，其中所述服务小区类型包括宏小区或微微小区，并且所述目标小区类型包括宏小区或微微小区。
4.如权利要求1所述的方法，其中选择用于切换的A3offset-TTT对包括基于所述移动性状态来选择所述TTT，其中第一TTT与高移动性状态的检测相关联，并且第二TTT与中移动性状态的检测相关联。
5.如权利要求4所述的方法，其中所述TTT与检测到的所述移动性状态成反比例。
6.如权利要求5所述的方法，其中所述UE的移动性状态是至少部分地根据在预定的时间段期间小区重选的数量来确定的。
7.如权利要求5所述的方法，还包括当检测到针对所述高移动性状态的标准时，使所述UE进入所述高移动性状态；当检测到针对所述中移动性状态的标准时，使所述UE进入所述中移动性状态；以及当所述UE在所述高移动性状态中时，选择与当所述UE在所述中移动性状态中时不同的用于切换的A3offset-TTT对。
8.一种被配置为用于根据速度的小区重选的用户设备(UE)，包括：
处理电路，其基于所述UE的移动性状态并且进一步基于服务小区类型和目标小区类型中的一个或多个来选择用于切换的A3offset-TTT对，其中所述A3offset-TTT对包括A3offset值和触发时间(TTT)，所述处理电路还根据包含参考信号的资源块(RB)的参考信号接收功率(RSRP)与接收信号强度指示(RSSI)之比来确定服务小区的参考信号接收质量(RSRQ)和目标小区的RSRQ；以及
物理层电路，其在所述目标小区RSRQ超过所述服务小区RSRQ至少所述A3offset值并持续所述TTT时，基于所选择的A3offset-TTT对将测量报告传输到服务eNB以用于从所述服务小区切换到所述目标小区。
9.如权利要求8所述的UE，其中根据由eNB在预定的物理资源块(PRB)中传输的信道状态信息参考信号(CIS-RS)和公共参考信号(CRS)中的一个或多个来确定所述RSRP。
10.如权利要求8所述的UE，其中所述服务小区类型包括宏小区或微微小区，并且所述目标小区类型包括宏小区或微微小区。
11.如权利要求8所述的UE，其中所述处理电路还被布置为选择用于切换的A3offset-TTT对，包括基于所述移动性状态来选择所述TTT，其中第一TTT与高移动性状态的检测相关联，并且第二TTT与中移动性状态的检测相关联。
12.如权利要求11所述的UE，其中所述TTT与检测到的所述移动性状态成反比例。
13.如权利要求12所述的UE，其中所述UE的移动性状态是至少部分地根据在预定的时间段期间小区重选的数量来确定的。
14.如权利要求12所述的UE，其中当检测到针对所述高移动性状态的标准时，所述处理电路使所述UE进入所述高移动性状态；当检测到针对所述中移动性状态的标准时，所述处理电路使所述UE进入所述中移动性状态；以及当所述UE在所述高移动性状态中时，所述处理电路选择与当所述UE在所述中移动性状态中时不同的用于切换的A3offset-TTT对。
15.一种非暂时性计算机可读存储介质，其存储指令，所述指令用于由一个或多个处理器执行以执行用于根据速度的小区重选的操作，所述指令将所述一个或多个处理器配置为执行如权利要求1-7中任一项所述的方法。
16.一种用于切换发起的设备，所述设备包括：
存储指令的存储器；以及
耦合到所述存储器的处理器，所述指令在被所述处理器执行时执行如权利要求1-7中的任一项所述的方法。
17.一种用于根据速度的小区重选的装置，所述装置包括：
用于基于UE的移动性状态并且进一步基于服务小区类型和目标小区类型中的一个或多个，选择用于切换的A3offset-TTT对的单元，其中所述A3offset-TTT对包括A3offset值和触发时间(TTT)；
用于根据包含参考信号的资源块(RB)的参考信号接收功率(RSRP)与接收信号强度指示(RSSI)之比来确定服务小区的参考信号接收质量(RSRQ)和目标小区的RSRQ的单元；以及
用于当目标小区RSRQ超过服务小区RSRQ至少所述A3offset值并持续所述TTT时，基于所选择的A3offset-TTT对将测量报告传输到服务增强节点B(eNB)以用于从所述服务小区切换到所述目标小区的单元。
18.如权利要求17所述的装置，其中根据由eNB在预定的物理资源块(PRB)中传输的信道状态信息参考信号(CIS-RS)和公共参考信号(CRS)中的一个或多个来确定所述RSRP。
19.如权利要求17所述的装置，其中所述服务小区类型包括宏小区或微微小区，并且所述目标小区类型包括宏小区或微微小区。
20.如权利要求17所述的装置，其中用于选择用于切换的A3offset-TTT对的单元包括用于基于所述移动性状态来选择所述TTT的单元，其中第一TTT与高移动性状态的检测相关联，并且第二TTT与中移动性状态的检测相关联。
21.如权利要求20所述的装置，其中所述TTT与检测到的所述移动性状态成反比例。
22.如权利要求21所述的装置，其中所述UE的移动性状态是至少部分地根据在预定的时间段期间小区重选的数量来确定的。
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