CN104170279B - 用于减少无线接入网络中的延迟的用户设备和方法 - Google Patents

用于减少无线接入网络中的延迟的用户设备和方法 Download PDF

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CN104170279B
CN104170279B CN201380014545.1A CN201380014545A CN104170279B CN 104170279 B CN104170279 B CN 104170279B CN 201380014545 A CN201380014545 A CN 201380014545A CN 104170279 B CN104170279 B CN 104170279B
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delay
control elements
bsr
enb
uplink
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CN104170279A (zh
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J·朱
R·万尼塔姆比
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Intel Corp
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Intel Corp
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Abstract

本文概括而言描述了用于减少无线接入网络(RAN)中的延迟的用户设备和方法的实施例。本文公开的实施例提供用于减少延迟的能够适用于3GPP LTE RAN的增强功能，减少延迟可以对实时过顶(OTT)应用尤其有利。一些实施例提供了上行链路延迟缓冲区状态报告。一些实施例提供了下行链路拥塞和缓冲区报告。一些实施例提供了基于流量特性的UE间优先化。

Description

用于减少无线接入网络中的延迟的用户设备和方法
优先权要求
本申请要求于2012年9月25日递交的美国专利申请序列号No.13/625,977的优先权的权益，该申请要求于2012年3月16日递交的美国临时申请序列号No.61/612,188的优先权的权益，其全部内容以引用的方式被并入本文。
技术领域
实施例涉及无线通信。一些实施例涉及在无线接入网络中进行调度的分组，所述无线接入网络包括第三代合作伙伴计划(3GPP)通用陆地无线接入网(UTRAN)长期演进(LTE)网络(E-UTRAN)。一些实施例涉及LTE网络的演进分组核心(EPC)。
背景技术
在无线接入网络(RAN)中，当上行链路分组准备发送时，通信站(例如，用户设备(UE))通常请求上行链路带宽的授权。该技术的一个问题在于，UE在请求上行链路授权之前，必须等待新的上行链路分组从其应用层到达。这导致了延迟，该延迟尤其对于延迟敏感和实时应用而言可能是个问题。随着便携式互联网设备(例如，智能电话、平板电脑和笔记本设备)的扩散，使用默认载体来对各种应用的分组进行过顶(OTT)传送。这些应用对于EPC而言是透明的，这使其很难支持这些应用(尤其是延迟敏感的应用)的服务质量(QoS)级别的要求。
因此，需要的是有助于减少或消除RAN中的延迟(包括与请求上行链路带宽授权相关联的延迟)的UE和方法。还需要的是适用于与延迟敏感和实时应用一起使用的减少或消除延迟的UE和方法。存在针对应用，尤其是针对在EPC中透明的延迟敏感应用而提供改进型QoS支持的系统和方法的通用需求。
附图示出
图1示出了根据一些实施例的无线接入网络的元素；
图2示出了根据一些实施例的各种载体；
图3示出了根据一些实施例的LTE协议栈；
图4是示出了根据一些实施例的用于上行链路共享信道的逻辑信道标识符(LCID)值的表；
图5示出了根据一些实施例的延迟缓冲区状态报告(D-BSR)介质访问控制(MAC)控制元素；
图6是示出了根据一些实施例的延迟值索引的表；
图7示出了根据一些实施例的下行链路拥塞和缓冲区报告(DCBR)控制元素；
图8A是示出了根据一些实施例的平均分组延迟(APD)索引的表；
图8B是示出了根据一些实施例的下行链路缓冲区大小(DBS)索引的表；
图9是示出了根据一些实施例的用于下行链路共享信道的LCID值的表；以及
图10是示出了根据一些实施例的-流量特性(TC)参数映射(PTM)的优先级的表。
具体实施方式
以下的描述和附图充分地示出了具体的实施例以使本领域的技术人员能够实施这些实施例。其它实施例可以合并结构的、逻辑的、电的、进程以及其它改变。一些实施例的部分和特征可以包括在其它实施例的这些部分和特征中或者由其它实施例的这些部分和特征所替代。权利要求中阐述的实施例包含了这些权利要求的所有可用的等效物。
图1示出了根据一些实施例的无线接入网络的元素。无线接入网络100可以包括用户设备(UE)102和增强型节点B(eNB)104，所述用户设备(UE)102和增强型节点B(eNB)104在一个或多个无线通信信道上进行无线通信。在无线接入网络100中，可以使用QoS类别标识符(QCI)将数据流映射到载体。在LTE实施例中，eNB 104可以包括LTE协议栈114，并且UE102可以包括LTE协议栈112。LTE协议栈112和114可以被配置为允许eNB 104和UE 102根据3GPP LTE协议进行通信。LTE协议栈可以包括被配置为执行本文所描述的操作的处理电路。
本文公开的一些实施例提供可以适用于用于减少延迟的3GPP LTE无线接入网络的增强功能，这可以对于实时OTT应用尤其有利。一些实施例通过提供上行链路延迟缓冲区状态报告来减少延迟。一些实施例通过提供下行链路拥塞和缓冲区报告来减少延迟。一些实施例通过提供基于流量特性的UE间/QIC内优先化来减少延迟。下面将对这些实施例进行更详细地描述。
根据上行链路延迟缓冲区状态报告的实施例，UE 102可以确定延迟值，该延迟值指示eNB 104(其可以为服务eNB)用于延迟对上行链路授权进行调度的最短时间。UE 102可以确定预测的缓冲区大小，并且利用上次调度的上行链路(UL)授权(即，先前的UL授权)来生成用于传输至eNB 104的延迟缓冲区状态报告(D-BSR)MAC控制元素。在这些实施例中，D-BSR控制元素可以包括至少延迟值的指示符和预测的缓冲区大小的指示符。预测的缓冲区大小可以指示UE 102预期其在由延迟值指示的不久的将来所需的授权量。
在这些实施例中，D-BSR MAC控制元素被用于请求延迟的上行链路授权。延迟值可以指示eNB 104用于延迟对上行链路授权进行调度的最短时间。通过预测缓冲区大小并且请求对上行链路授权的延迟调度，UE 102在请求上行链路授权之前可以不必等待新的上行链路分组从其应用层到达。常规上，在当前缓冲区大小为零时，由于没有准备传输的上行链路分组，所以UE不请求上行链路授权。
根据实施例，UE 102可以从eNB 104接收上行链路授权。响应于该上行链路授权，如果没有触发其它类型的BSR，那么UE 102可以向eNB 104发送具有数据有效负载的MAC协议数据单元(PDU)和D-BSR MAC控制元素。在这些实施例中，D-BSR MAC控制元素中的延迟值和缓冲区大小可以通过UE 102基于例如最小分组大小和最大到达之间时间间隔之类的信息进行设置，所述信息可以通过在UE 102上本地运行的应用来确定或提供。当eNB 104接收到具有D-BSR MAC控制元素的分组时，eNB 104可以基于D-BSR MAC控制元素中的信息利用最小延迟和授权大小来对上行链路授权进行调度。下面将对这些实施例进行更详细地论述。
在一些实施例中，可以使用QCI将数据流映射到载体，以经由演进型分组系统(EPS)载体来提供端到端的QoS支持。在一些实施例中，QCI的特性可以根据3GPP技术规范(TS)23.203，尽管这不是要求。在这些实施例中，无线接入网络100可以提供具有开放接口的所有互联网协议(IP)核心网，并且可以被称作EPC。EPC可以提供更高的吞吐量、更低的延迟、3GPP和非3GPP网络之间简化的移动性、增强的服务控制和供应，以及网络资源的有效使用。
图2示出了根据一些实施例的各种载体。在这些实施例中，使用QCI将数据流映射到载体200。如图2所示出的，E-UTRAN无线接入载体(E-RAB)207可以在UE 102和EPC之间传输EPS载体211的分组。当存在E-RAB 207时，可以在E-RAB 207和EPS载体211之间存在一对一映射。数据无线载体203可以在UE 102和eNB 104之间传输EPS载体211的分组。当存在数据无线载体时，可以在数据无线载体203和EPS载体或E-RAB 207之间存在一对一映射。S1载体205可以在eNB 104和服务网关(S-GW)106之间传输E-RAB 207的分组。S5/S8载体209可以在S-GW 106和分组数据网络(PDN)网关(P-GW)108之间传输EPS载体211的分组。
UE 102可以存储上行链路分组过滤器和数据无线载体之间的映射，以创建上行链路中的数据流和数据无线载体之间的绑定。UE中的上行链路业务流模板(TFT)可以在上行链路方向将数据流绑定到EPS载体。多个数据流可以在同一EPS载体上多路复用。P-GW中的下行链路TFT可以在下行链路方向将数据流绑定到EPS载体。通过在下行链路TFT中包括多个下行链路分组过滤器，多个数据流可以在同一EPS载体上多路复用。P-GW 108可以存储下行链路分组过滤器和S5/S8载体209之间的映射，以创建下行链路中的数据流和S5/S8a载体之间的绑定。
eNB 104可以存储数据无线载体203和S1载体205之间的一对一映射，以创建上行链路和下行链路二者中的数据无线载体和S1载体之间的绑定。S-GW 106可以存储S1载体205和S5/S8载体209之间的一对一映射，以创建上行链路和下行链路二者中的S1载体和S5/S8载体之间的绑定。
在一些实施例中，使用默认载体(即，QCI＝9)来对数据流的分组进行OTT传送。这样的应用的示例包括可以在便携式互联网设备(例如，网络中使用的智能手机、平板电脑或超极本)上运行的应用。由于对于网络或移动运营商而言可能不知道QoS要求(例如，有时候由于加密)，所以可以对由这些应用生成的数据分组进行OTT传送(即，使用默认载体)。可以进行OTT传送的一些延迟敏感和实时应用的示例可以包括Skype、FaceTime、GoogleTalk以及互联网语音协议(VoIP)，每一个在延迟和吞吐量方面均具有不同的QoS要求，这可以与非实时应用(例如，网页浏览或电子邮件)相区别。D-BSR的使用可以减少与进行OTT传送的实时应用相关联的任何延迟。
图3示出了根据一些实施例的LTE协议栈。LTE协议栈300可以适用于用作LTE协议栈112(图1)和LTE协议栈114(图1)，尽管其它的配置也可以适用。
LTE信道可以分为三种类型的数据信道。逻辑信道由其承载的信息类型所限定。逻辑信道分为控制信道和流量信道。传输信道由如何传输信息和传输具有什么特性的信息而进行限定。物理信道由被用于传输数据的物理资源来限定。传输信道被映射到物理信道上。数据信道进一步分为控制信道和流量信道。流量信道承载用户平面的信息，而控制信道承载控制平面的信息。无线载体信道在UE 102和eNB 104之间传输EPS载体的分组。
LTE层3包括无线资源控制(RRC)层。LTE RRC层提供对系统信息的广播，配置MAC、无线链路控制(RLC)和分组数据汇聚协议(PDCP)层，并且执行移动功能和QoS管理功能。进一步地，RRC负责UE和网络之间的控制平面信令。RRC承担与接入层相关的广播系统信息和对非接入层(NAS)消息的传输、寻呼、RRC连接的建立和释放、安全密匙管理、切换、与系统间移动性相关的UE测量、QoS等。NAS提供UE和网络侧(未示出)上的移动性管理实体(MME)之间的通信以用于控制的目的，例如，网络附着、认证、建立和设置载体、以及移动性管理。NAS还执行对UE的认证和安全控制，并且生成寻呼消息的一部分。
层3与层2相连接并且还直接与层1相连接。层2被划分为MAC、RLC和PDCP。MAC提供寻址和信道接入控制机制。MAC还管理混合自动重传请求(HARQ)错误修正、对用于同一UE的逻辑信道的优先化和UE之间的动态调度等。RLC被用于对流量进行格式化和传输。此外，RLC传输PDCP的PDU，并且可以取决于提供的可靠性来以三种不同模式中的一种进行工作。取决于该模式，RLC可以提供自动重传请求(ARQ)错误修正、对PDU的分段/级联、对按序传送的重排序、重复检测等。PDCP负责对用户平面的IP分组的报头进行压缩(或解压缩)。PDCP利用加密和完整性保护来提供对RRC的数据的传输，并且利用报头压缩和加密来提供对IP分组的IP层的传输，并且取决于RRC的模式、按序传输、重复检测以及提供在切换期间对其自身的服务数据单元(SDU)的重发。
层1是物理(PHY)层，并且提供网络的基本网络硬件传输技术。PHY层将逻辑通信请求转化为硬件专用操作，例如，调制、位同步、多路复用、均衡化、前向纠错等。物理层经由空中接口承载来自MAC的传输信道的信息，并且针对RRC层处理链路适配(AMC)、功率控制、小区搜索(出于初始同步和切换的目的)，以及其它测量(在LTE系统内部以及在系统之间)。
图4是示出了根据一些实施例的用于上行链路共享信道的LCID值的表。在这些实施例中，UE 102(图1)可以将D-BSR MAC控制元素配置为进一步包括LCID索引402，以指示用于延迟缓冲区状态报告的控制元素。换句话说，LCID索引402可以指示MAC控制元素是D-BSRMAC控制元素。在这些实施例中，预定的LCID索引404(例如，图4中示出的索引‘01011’)可以用于指示D-BSR MAC控制元素包括用于D-BSR的信息并且为D-BSR MAC控制元素(而不是另一类型的MAC控制元素，如表中示出的)。非延迟或常规的BSR控制元素可以包括LCID索引以指示截短式BSR 406、短BSR 408和长BSR 410中的一个。
图5示出了根据一些实施例的D-BSR MAC控制元素。在这些实施例中，D-BSR MAC控制元素500可以包括逻辑信道组(LCG)标识符(ID)字段502，以指示控制元素500的LCG ID。LCG ID字段502可以包括预定的LCID索引404(图4)(例如图4中示出的索引‘01011’)，以指示控制元素为请求延迟的上行链路授权的D-BSR MAC控制元素。D-BSR MAC控制元素500还可以包括至少延迟值的指示符504和预测的缓冲区大小的指示符506。
在一些实施例中，D-BSR MAC控制元素500可以被认为是MAC控制帧。D-BSR MAC控制元素500可以是针对上行链路带宽的延迟授权的请求。在一些实施例中，可以从UE 102向上行链路共享信道(UL-SCH)上的eNB104发送D-BSR MAC控制元素500，尽管实施例的范围在这方面不受限制。
图6是示出了根据一些实施例的延迟值索引的表。用于选定的延迟值604的索引602可以被包括在用于指示符504(图5)的D-BSR MAC控制元素500中(图5)。该表可被存储在UE 102的存储器中(图1)。
根据实施例，UE 102可以确定延迟值604，该延迟值604指示了eNB 104用于延迟对上行链路授权进行调度的时间。UE 102还可以确定用于由指示符504指示的预测的缓冲区大小，并且可以利用上次调度的上行链路授权来生成用于传输至eNB 104的D-BSR MAC控制元素500。如上所述，D-BSRMAC控制元素500可以包括至少延迟值604的指示符504和预测的缓冲区大小的指示符506。
在一些实施例中，延迟值604可以指示eNB 104用于延迟对上行链路授权进行调度的最短时间，在一些实施例中，预测的缓冲区大小指示UE 102预期其在由延迟值604指示的不久的将来所需的上行链路授权量。
在一些实施例中，UE 102可以被配置为：当期望延迟授权时(响应于传送D-BSRMAC控制元素500)，避免响应于从应用层接收新的上行链路分组而请求附加的上行链路授权。下面将对这些实施例进行更详细地描述。
在一些实施例中，UE 102可以响应于对D-BSR MAC控制元素500的传送来接收对上行链路带宽的延迟授权。该授权可以不早于延迟值604而从eNB 104接收并且包括足够处理预测的缓冲区大小506的带宽分配。
在一些实施例中，在当前缓冲区大小为零并且在UE基于预测的缓冲区大小(即，由于预测的缓冲区大小比零大)预期(例如，预测或确定)其将很快(例如，在少于120ms内)具有上行链路分组时，UE 102可以利用上次调度的上行链路授权来生成用于传输到eNB 104的D-BSR MAC控制元素500。在这些实施例中，缓冲区状态报告可以指示当前上行链路缓冲区为空，并且因此UE 102不具有准备进行上行链路传输的任何分组；然而，D-BSR MAC控制元素500被配置为指示预测的缓冲区大小。在这些实施例中，D-BSR MAC控制元素500可以仅在当前缓冲区大小为零时使用。否则可以使用常规或非延迟的BSR控制元素。在这些实施例中，预测的缓冲区大小可以基于在UE上运行的应用来确定，所述UE生成用于上行链路传输的分组。
在一些实施例中，在当前缓冲区大小为零并且在UE基于预测的缓冲区大小预期其将不会很快具有分组时，UE 102可以避免利用上次调度的授权来生成用于到eNB 104的传输的D-BSR MAC控制元素500。在该情况下，预测的缓冲区大小可以为零；然而，当前缓冲区大小可以为零或大于零。
在一些实施例中，在当前缓冲区大小不为零时，UE 102可以利用上次调度的上行链路授权来生成用于传输到eNB 104的非延迟BSR控制元素。非延迟BSR控制元素可以指示至少当前缓冲区大小。非延迟BSR控制元素可以是常规BSR控制元素，尽管实施例的范围在这方面不受限制。非延迟BSR控制元素可以包括LCID索引以指示图4中示出的截短式BSR406、短BSR 408和长BSR 410中的一个。
在一些实施例中，当触发其它类型的BSR时，UE 102可以避免生成D-BSR MAC控制帧500。在这些实施例中，当未触发其它类型的(非延迟)BSR时，UE 102可以生成D-BSR MAC控制帧500。当在UE处的当前缓冲区不为零时，可以触发非延迟的BSR。本文公开的用于D-BSR报告的实施例与一些常规的BSR报告不同，在一些常规的BSR报告中在当前缓冲区大小为零时没有对授权进行请求或者调度，由此使得UE 102在请求上行链路授权之前需要等待将来的(新的)上行链路分组从UE 102的应用层到达。D-BSR MAC控制元素500的使用可以减少当新的分组从应用层到达时和当eNB 104对上行链路授权进行调度时之间的延迟。通过对D-BSR MAC控制元素500的使用，可以将延迟减少至零或接近零。
常规地，eNB 104在基于报告的缓冲区大小来对授权进行调度之前必须等待该延迟(最小限度地)。然而，根据示例实施例，在t0时，UE 102可以将延迟设置为100ms并且将缓冲区大小设置为100字节来向eNB 104发送D-BSR MAC控制元素。然后，eNB 104可以仅在t0+100ms之后调度这100字节。在一些实施例中，延迟值504指示eNB 104在对上行链路授权进行调度之前需要等待的最小限度的时间量。在该示例中，eNB 104可以在t0+200ms(大于或等于100ms的任何值)时对授权进行调度，但是不能在t0+99ms时对授权进行调度。
在一些实施例中，UE 102可以被配置为：至少部分地基于用于运行在UE 102上的一个或多个应用的上行链路流量信息，来确定延迟值604和预测的缓冲区大小(即，包含在D-BSR MAC控制元素500中)。上行链路流量信息包括用于一个或多个应用的分组或比特生成率、分组到达时间间隔(PAI)和分组大小(PS)信息中的一个或多个。在这些实施例中，UE102可以基于诸如最小PS和最大到达之间时间间隔之类的信息来确定延迟值和预测的缓冲区大小，所述信息可以由在UE 102上本地运行的应用来确定或提供。
在一些实施例中，可以基于分组到达时间间隔、上次分组到达时间和上次授权到达时间来确定延迟值604。预测的缓冲区大小可以基于分组大小。在这些实施例中，延迟值604可以是上行链路授权请求延迟值。
在示例实施例中，其中VoIP应用运行在UE 102上并且以20ms的PAI和200比特的PS的恒定比特率(CBR)来生成流量，UE 102可以通过如下方式确定延迟值604和预测的缓冲区大小：可以基于方程式z-(y-x)来计算延迟值，并且预测的缓冲区大小可以被设置为‘s’，其中‘x’表示上次分组到达时间(从上层到达蜂窝式调制解调器的分组)，‘y’表示上次授权到达时间(授权用于调度D-BSR和缓冲区中的最后分组)，‘z’表示已知的PAI，并且‘s’表示已知的PS。延迟值604可以从可以被存储在UE 102的存储器中的表(例如，图6中示出的表)中选择。在这些实施例中，从所述表中所选择的延迟值可以大于或等于所计算的延迟值。例如，如果计算得到21ms的延迟值，那么可以从表中选择40ms的延迟值。用于选定的延迟值的索引602可以包括在用于指示符504的D-BSR MAC控制元素500中。
在一些实施例中，D-BSR MAC控制元素500可以用于请求一个或多个数据流的上行链路带宽的延迟授权。例如，UE 102可以被配置为在无线接入网络(例如，LTE网络)中运行，在所述无线接入网络中使用QCI将数据流映射到载体。可以使用默认载体(例如，QCI＝9)使数据流与OTT应用相关联，尽管实施例的范围在这方面不受限制，因为D-BSR MAC控制元素500可以被用来请求用于具有其它QCI值的数据流的上行链路带宽的延迟授权。在这些实施例中，每个带宽请求可以与LCG相关联，该LCG可以在D-BSR MAC控制元素500的LCG ID字段502中被识别出。在一些实施例中，用于UE的所有数据流量(无论QCI是什么)都可以在同一LCG中发送。
在一些下行链路拥塞和缓冲区报告实施例中，UE 102可以被配置为向eNB 104发送请求以激活下行链路拥塞和缓冲区报告并且从eNB 104接收DCBR。DCBR可以指示下行链路流量是否存在拥塞，并且可以指示平均分组延迟和下行链路缓冲区大小。DCBR可以指示用于某个EPS载体的QCI的下行链路流量是否存在拥塞。响应于对指示拥塞存在的DCBR的接收，UE 102可以将来自DCBR的信息报告给一个或多个其应用(在上级层中运行)，以用于降低流量速率、减轻拥塞和/或减少延迟。下面将对这些实施例进行更详细地论述。
图7示出了根据一些实施例的DBSR控制元素。可以由UE 102(图1)接收DCBR作为DCBR MAC控制元素700的一部分，DCBR MAC控制元素700可以包括拥塞指示符(CI)702、平均分组延迟(APD)指示符704和DBS指示符706。CI 702可以指示下行链路流量是否存在拥塞。
在一些实施例中，DCBR MAC控制元素700可以包括LCID索引904(图9)以指示控制元素是用于下行链路拥塞和缓冲区报告的。在一些实施例中，DCBR MAC控制元素700可以包括LCG ID字段(未单独示出)，该字段可以与字段502(图5)相似。
在一些实施例中，DCBR MAC控制元素700可以由UE 102从下行链路共享信道(DL-SCH)上的eNB 104接收作为MAC PDU的一部分或与MAC PDU一起被接收，尽管实施例的范围在这方面不受限制。在这些实施例中，APD指示符704指示下行链路上的平均分组延迟，DBS指示符706指示下行链路缓冲区中的多个剩余字节。
在一些实施例中，例如，可以由eNB 104基于其下行链路传输队列来检测拥塞，尽管实施例的范围在这方面不受限制。在一些实施例中，如果下行链路传输队列的排队延迟持续地超过了阈值(例如，200ms)比阈值(例如，20ms)更长的一段时间，则可以检测到拥塞，尽管实施例的范围在这方面不受限制。
在示例实施例中，可以每隔N个传输分组(例如，N＝100)来测量平均分组延迟，并且当准备DCBR MAC控制元素700时，缓冲区大小可以指示剩余字节的数量。图8A和图8B的表是可以如何对APD 804和DBS 806进行编码以使其包括在DCBR MAC控制元素700中的示例。在示例实施例中，CI指示符702可以被设置为零以指示不存在拥塞或者不再存在拥塞，并且可以被设置成另一个值以指示检测到拥塞。
在一些实施例中，eNB 104可以从UE 102接收RRC消息以激活下行链路拥塞和缓冲区报告。该消息可以指示要激活下行链路拥塞和缓冲区报告的EPS载体的QCI。eNB 104可以监视用于UE 102的所指示的QCI的下行链路流量以确定是否存在拥塞，并且可以与MAC PDU一起向UE 102发送DCBR MAC控制元素700。QCI可以指示默认载体(例如，QCI＝9)，尽管这不是要求，因为可以指示其它QCI。DCBR MAC控制元素700可以指示用于EPS载体的所识别的QCI的下行链路流量是否存在拥塞，可以指示APD，并且可以指示下行链路缓冲区大小。响应于对指示存在拥塞的DCBR MAC控制元素700的接收，UE 102可以将来自DCBR MAC控制元素700的信息报告给一个或多个其应用(在上级层中运行)，以便降低流量速率、减轻拥塞和/或减少延迟。
在一些实施例中，eNB 104可以被配置为当用于下行链路流量的下行链路缓冲区大小随着指示的QCI增加时，继续与MAC PDU一起向UE 102发送DCBR MAC控制元素700。当用于下行链路流量的下行链路缓冲区大小不随着指示的QCI增加时，eNB 104可以不与DCBRMAC控制元素700一起发送MAC PDU。
当不再检测到下行链路拥塞时，eNB 104可以与MAC PDU一起向UE102发送DCBRMAC控制元素700，DCBR MAC控制元素700指示拥塞不再存在(即，CI可以被设置为零)。在这种情况下，DCBR MAC控制元素700可以包括当前平均分组延迟和当前下行链路缓冲区大小。在这些实施例中，UE 102可以被配置为发送RRC消息，以禁用下行链路拥塞和缓冲区报告。用于禁用下行链路拥塞和缓冲区报告的消息可以在下行链路拥塞和缓冲区报告已经被激活并且UE 102不再希望从eNB 104接收下行链路拥塞和缓冲区报告之后的任何时间从UE102中发出。响应于对用于禁用下行链路拥塞和缓冲区报告的RRC消息的接收，eNB 104可以禁用下行链路拥塞和缓冲区报告，并且可以避免发送任何进一步的DCBR MAC控制帧。
图9是示出了根据一些实施例的用于下行链路共享信道的LCID值的表。在这些实施例中，DCBR MAC控制元素700(图7)可以包括LCID索引904(例如，索引‘01011’)，以指示控制元素是用于下行链路拥塞和缓冲区报告的。
图10是示出了根据一些实施例的PTM优先级的表。在这些PTM实施例中，UE 102(图1)和eNB 104(图1)可以被布置为执行基于流量特性(TC)的UE间/QCI内优先化(TCUP)。在这些实施例中，eNB 104可以向UE 102发送UE间/QCI内的流量特性以允许UE 102通知其应用来对其流量进行调节。eNB 104可以例如使轻实时流量优先于重非实时流量，即使当这两种流量类型均具有相同的QCI时。流量特性的示例可以包括最大流量突发大小和最大持续流量速率，尽管还可以使用其它流量特性。
在一些实施例中，UE 102可以向eNB 104发送RRC请求消息以激活用于EPS载体的QCI的TCUP。UE 102可以从eNB 104接收RRC响应消息，该RRC响应消息指示用于所请求的QCI的流量特性参数映射(例如，PTM)的优先级。RRC响应可以指示UE间/QCI内优先级和TC参数。UE102可以基于PTM来调节具有所请求的QCI的上行链路流量。在这些实施例中，由UE 102发送的RRC请求消息可以指示TCUP将是活动的EPS载体的QCI。在这些实施例中，如果eNB 104接受针对TCUP的请求，则可以从eNB 104发送RRC响应消息。
在一些实施例中，UE间/QCI内优先级和TC参数可以包括用于最大流量突发大小1004和最大持续流量速率1006中的一个或多个的UE间/QCI内优先级1002。图10中示出了其示例。在这些实施例中，对上行链路流量的调节可以包括：指示在UE 102上运行的一个或多个应用以基于参数来调节上行链路流量。
在图10示出的示例中，如果其最大流量突发小于200字节并且最大持续流量速率小于10kBps，那么在调度中可以给予用于具有QCI为9的UE的流量更高的优先级。在一些实施例中，PTM可以为UE专用，这可以取决于UE的信道质量和移动特性。关于如何指定PTM的细节可以取决于单独的eNB实现。
在一些实施例中，如果由于网络负载中的变化、UE信道质量中的变化或者其它原因需要更新映射，则eNB 104可以向UE 102发送RRC消息。UE 102还可以发送RRC消息以禁用TCUP。
在一些实施例中，UE 102的物理层(见图3)可以包括使用一根或多根天线用于向和从eNB传输和接收信号的物理层电路。UE 102还可以包括处理电路，所述处理电路除了其他方面之外还可以包括信道估计器。UE 102还可以包括存储器。处理电路可以被配置为确定下文讨论的用于到eNB的传输的若干不同的反馈值。处理电路还可以包括MAC层。
在一些实施例中，UE 102可以包括键盘、显示器、非易失性存储器端口、多根天线、图形处理器、应用处理器、扬声器和其它移动设备元件中的一个或多个。显示器可以是包括触摸屏在内的液晶显示器(LCD)屏幕。由UE 102利用的所述一根或多根天线可以包括：一根或多根定向天线或全方向天线，包括例如，偶极天线、单极天线、贴片天线、环形天线、微带天线或适用于射频(RF)信号传输的其它类型的天线。在一些实施例中，可以使用具有多孔的单根天线，而不是两根或多根天线。在这些实施例中，每个孔都可以看成是单独的天线。在一些多输入多输出(MIMO)实施例中，可以有效地将天线分离，以利用空间多样性和可以在每根天线和发射站的天线之间产生的不同的信道特性。在一些MIMO实施例中，天线可以由多达波长的十分之一或更多而进行分离。
虽然将UE 102示出为具有若干单独功能的元件，但是所述功能元件中的一个或多个可以通过软件配置的元件的组合来进行组合并且可以被实现，软件配置的元件例如是包括数字信号处理器(DSP)，和/或其它硬件元件的处理元件。例如，一些元件可以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)以及用于执行至少本文所述功能的各种硬件或逻辑电路的组合。在一些实施例中，功能元件可以指运行在一个或多个处理元件上的一个或多个进程。
实施例可以在硬件、固件和软件中的一种或其组合中实现。实施例还可以被实现为存储在计算机可读存储介质中的指令，可以通过至少一个处理器来读取并且执行所述指令，从而执行本文所述的操作。计算机可读存储介质可以包括用于以由机器(例如，计算机)可读的形式存储信息的任何非暂时性机制。例如，计算机可读存储介质可以包括：只读存储器(ROM)、随机存取存储器(RAM)、磁盘存储介质、光储存介质、闪存存储器器件和其它存储器件和介质。在一些实施例中，UE 102的一个或多个处理器可以配置有指令以执行本文所述的操作。
在一些实施例中，UE 102可以被配置为：根据正交频分多址(OFMA)通信技术，在多载波通信信道上接收正交频分多路复用(OFDM)通信信号。OFDM信号可以包括多个正交子载波。
在一些LTE实施例中，无线资源的基本单元是物理资源块(PRB)。PRB可以包括：频域中的12个子载波x时域中的0.5ms。PRB可以成对地进行分配(在时域中)。在这些实施例中，PRB可以包括多个资源单元(RE)。RE可以包括：一个子载波x一个符号。
两种类型的参考信号可以由eNB进行传输，所述参考信号包括解调参考信号(DM-RS)、信道状态信息参考信号(CIS-RS)和/或公共参考信号(CRS)。DM-RS可以由UE使用以用于数据解调。参考信号可以在预定的PRB中进行传输。
在一些实施例中，OFDMA技术可以是使用不同的上行链路频谱和下行链路频谱的频域双工(FDD)技术或使用用于上行链路和下行链路的相同频谱的时域双工(TDD)技术。
在一些其它实施例中，UE 102和eNB 104可以被配置为：使用一种或多种其它调制技术(例如，扩频调制(例如，直接序列码分多址(DS-CDMA)和/或跳频码分多址(FH-CDMA))、时分复用(TDM)调制，和/或频分复用(FDM)调制)来对通信信号进行传递，尽管实施例的范围在这个方面不受限制。
在一些实施例中，UE 102可以是便携式无线通信设备的一部分，例如，个人数字助理(PDA)、具有无线通信能力的膝上型或便携式计算机、网络平板电脑、无线电话、无线耳机、寻呼机、即时通信设备、数码相机、接入点、电视机、医疗设备(例如，心率监视仪、血压监视仪等)、或可以无线地接收和/或传输信息的其它设备。
在一些LTE实施例中，UE 102可以计算若干不同的反馈值，其可以用于执行适用于闭环空间复用传输模式的信道。这些反馈值可以包括信道质量指示符(CQI)、秩指示符(RI)和预编码矩阵指示符(PMI)。通过CQI，发射机选择若干调制字母和编码速率组合中的一个。RI通知发射机关于用于当前MIMO信道的有用的传输层的数量，并且PMI指示在发射机处应用的预编码矩阵的码本索引(取决于发射天线的数量)。由eNB使用的码率可以基于CQI。PMI可以是由UE计算并且报告给eNB的向量。在一些实施例中，UE可以传输包含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可以是由UE 102体验的下行链路移动无线信道质量的指示。CQI允许UE 102向eNB提出最佳调制方案和编码率以在给定的无线链路质量下使用，从而使产生的传输块误码率不会超过某个值，例如10％。在一些实施例中，UE可以报告宽带CQI值，该值指系统带宽的信道质量。UE还可以报告一定数量的资源块的每个子带的子带CQI值，该值可以由更高层进行配置。子带的全集可以覆盖系统带宽。在空间复用的情况下，可以报告每码字的CQI。
在一些实施例中，PMI可以指示在给定的无线条件下由eNB使用的最佳预编码矩阵。PMI值参阅码本表。网络对由PMI报告表示的资源块的数量进行配置。在一些实施例中，为了覆盖系统带宽，可以提供多个PMI报告。还可以为闭环空间复用、多用户MIMO和闭环秩1预编码MIMO模式提供PMI报告。
在一些协作多点(CoMP)实施例中，网络可以被配置用于到UE的联合传输，其中两个或多个协作/配合点(例如，远程无线电头(RRH))联合进行传输。在这些实施例中，联合传输可以是MIMO传输，并且协作点可以被配置为执行联合波束成形。
本摘要是依据37C.F.R.第1.72(b)条提出的，该条规定要求摘要应允许读者确定本技术公开的本质和要点。应当理解的是，其不用于限制或解释权利要求的范围或含义。以下的权利要求由此被并入到详细描述中，每项权利要求其自身均作为单独的实施例。

Claims (16)

1.用户设备(UE)，其包括处理电路，所述处理电路用于：
确定延迟值，所述延迟值指示增强型节点B(eNB)用于延迟对上行链路授权进行调度的时间；以及
利用上次调度的上行链路授权来生成用于传输至所述eNB的延迟缓冲区状态报告(D-BSR)介质访问控制(MAC)控制元素，所述D-BSR MAC控制元素包括至少所述延迟值的指示符和预测的缓冲区大小的指示符，
其中，所述D-BSR MAC控制元素是针对上行链路带宽的延迟授权的请求。
2.根据权利要求1所述的UE，其中，所述处理电路进一步将所述D-BSR MAC控制元素配置为进一步包括逻辑信道标识符(LCID)索引，以指示用于延迟缓冲区状态报告的控制元素。
3.根据权利要求2所述的UE，其中，所述UE用于响应于对所述D-BSR MAC控制元素的传输而接收用于上行链路带宽的延迟授权，不早于所述延迟值来从所述eNB接收所述授权并且所述授权包括足够处理所述预测的缓冲区大小的带宽分配。
4.根据权利要求3所述的UE，其中，所述预测的缓冲区大小指示所述UE预期的其在由所述延迟值指示的不久的将来所需的上行链路授权量，并且
其中，所述UE被配置为：当期望延迟授权时，避免响应于从应用层对新的上行链路分组的接收而请求上行链路授权。
5.根据权利要求3所述的UE，其中，所述UE用于：在当前缓冲区大小为零并且在所述UE基于所述预测的缓冲区大小预期其将具有上行链路分组时，利用上次调度的上行链路授权来生成用于传输至所述eNB的所述D-BSR MAC控制元素。
6.根据权利要求5所述的UE，其中，所述UE用于：在当前缓冲区大小为零并且在所述UE基于所述预测的缓冲区大小预期其将不会具有分组时，避免利用上次调度的上行链路授权来生成用于传输至所述eNB的所述D-BSR MAC控制元素。
7.根据权利要求5所述的UE，其中，所述UE用于：在当前缓冲区大小不为零时，利用上次调度的上行链路授权来生成用于传输至所述eNB的非延迟BSR控制元素，所述非延迟BSR控制元素指示至少所述当前缓冲区大小，
其中，所述非延迟BSR控制元素包括LCID索引，以指示截短式BSR、短BSR和长BSR中的一个。
8.根据权利要求1所述的UE，其中，所述处理电路用于：
至少部分地基于用于运行在所述UE上的一个或多个应用的上行链路流量信息，来确定所述延迟值和所述预测的缓冲区大小，
其中，所述上行链路流量信息包括用于所述一个或多个应用的分组或比特生成率、分组到达时间间隔(PAI)和分组大小(PS)信息中的一个或多个。
9.根据权利要求1所述的UE，其中，所述D-BSR MAC控制元素请求用于数据流的上行链路带宽的延迟授权,
其中，所述UE被配置为在无线接入网络中运行，在所述无线接入网络中使用服务质量(QoS)类别标识符(QCI)来将所述数据流映射到载体。
10.根据权利要求1所述的UE，其中，所述UE被配置为从所述eNB接收下行链路拥塞和缓冲区报告(DCBR)，所述下行链路拥塞和缓冲区报告(DCBR)指示下行链路流量是否存在拥塞、指示平均分组延迟(APD)，并且指示下行链路缓冲区大小，
其中，响应于对指示拥塞存在的所述DCBR的接收，所述UE用于将来自所述DCBR的信息报告给一个或多个应用，以用于流量速率降低、拥塞减轻和延迟减少中的一个或多个。
11.根据权利要求10所述的UE，其中，接收所述DCBR作为DCBR MAC控制元素的一部分，所述DCBR包括拥塞指示符(CI)、平均分组延迟(APD)指示符和下行链路缓冲区大小(DBS)指示符，所述CI指示下行链路流量是否存在拥塞，并且
其中，所述DCBR MAC控制元素包括逻辑信道标识符(LCID)索引，以指示DCBR。
12.一种用于减少无线接入网络中的延迟的方法，所述方法包括：
确定延迟值，所述延迟值指示增强型节点B(eNB)用于延迟对上行链路授权进行调度的时间；
利用上次调度的上行链路授权来生成用于传输至所述eNB的延迟缓冲区状态报告(D-BSR)介质访问控制(MAC)控制元素，所述D-BSR MAC控制元素包括至少所述延迟值的指示符和预测的缓冲区大小的指示符；并且
响应于对所述D-BSR MAC控制元素的传输而接收用于上行链路带宽的延迟授权，不早于所述延迟值来从所述eNB接收所述延迟授权。
13.根据权利要求12所述的方法，其进一步包括：
确定所述预测的缓冲区大小；并且
将所述D-BSR MAC控制元素配置为包括逻辑信道标识符(LCID)索引，以指示用于延迟的缓冲区状态报告的控制元素。
14.根据权利要求12所述的方法，其中，所述延迟授权包括足够处理所述预测的缓冲区大小的带宽分配。
15.根据权利要求12所述的方法，其中，所述预测的缓冲区大小指示UE预期的其在由所述延迟值指示的不久的将来所需的上行链路授权量，以及
其中，所述方法包括：当期望延迟授权时，避免响应于从应用层对新的上行链路分组的接收而请求上行链路授权。
16.根据权利要求12所述的方法，其中，在当前缓冲区大小为零并且在UE基于所述预测的缓冲区大小而预期其将具有上行链路分组时，利用所述上次调度的上行链路授权来生成用于传输至所述eNB的所述D-BSR MAC控制元素。
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AU2013232628B2 (en) 2016-04-14
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CN104350798B (zh) 2019-09-17
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US20130265928A1 (en) 2013-10-10
FR3055080A1 (fr) 2018-02-16
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