CN103597764B - 移动通信系统载波聚合中发送随机接入和其他小区的其他上行链路信道的方法和设备 - Google Patents

移动通信系统载波聚合中发送随机接入和其他小区的其他上行链路信道的方法和设备 Download PDF

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CN103597764B
CN103597764B CN201280027416.1A CN201280027416A CN103597764B CN 103597764 B CN103597764 B CN 103597764B CN 201280027416 A CN201280027416 A CN 201280027416A CN 103597764 B CN103597764 B CN 103597764B
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random access
uplink channel
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郑景仁
G.J.范利肖特
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Samsung Electronics Co Ltd
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Abstract

本发明涉及在使用载波聚合技术的移动通信系统中来自多个服务小区的特定小区中的随机接入的传输，以及用于高效率地发送另一小区中随机接入之外的上行链路信道的方法。具体地，终端向基站发送上行链路信道的方法包括步骤：确认发送用于第一载波的随机接入前同步码的子帧中是否包括用于具有不同于第一载波的上行链路时序的第二载波的上行链路信道；如果包括，则确认发送随机接入前同步码所需的电力和发送上行链路信道所需的电力之和是否超过终端的最大传输电力；以及如果超过，则在上行链路信道之前优先发送随机接入前同步码。

Description

移动通信系统载波聚合中发送随机接入和其他小区的其他上 行链路信道的方法和设备
技术领域
本公开涉及在支持载波聚合的无线通信系统中用于终端向基站发送上行链路信道的方法。更具体地，本公开涉及用于当终端在特定小区中发送随机接入前同步码时在相同的定时在小区中发生上行链路传输时用于发送上行链路信道的上行链路信道传输方法和设备。
背景技术
移动通信系统已被开发为供用户在移动中通信。随着技术的快速前进，移动通信系统已经发展到能够提供高速数据通信服务以及语音电话服务的水平。最近，作为下一代移动通信系统之一，长期演进（LTE）正由第3代伙伴计划（3GPP）标准化。LTE是被设计为提供高达100Mbps的高速基于分组的通信的技术，并且目标在2010年左右商业部署。
同时，不同于语音业务，在根据要发送的数据量和信道条件确定的资源上提供数据业务。因此，无线通信系统，尤其是蜂窝通信，装备有调度器，其考虑需要的资源量、信道条件、数据量等来管理传输资源分配。这是作为下一代移动通信系统的LTE系统中的事实，位于基站的调度器管理传输资源分配。
最近的研究关注于为传统LTE系统适配若干新技术来提高数据速率的LTE高级（LTE-A）。载波聚合（CA）是这样的技术之一。CA是这样的技术，其聚合多个载波用于用户设备（UE）与演进节点B（eNB）之间的上行链路和下行链路传输，以便与聚合的载波数目成比例地增加数据接收量/接收数据速率或发送量/发送数据速率。在LTE中，在主载波频率上工作的小区被称为主小区（PCell），并且在其他频率载波上工作的其他小区被称为辅小区（SCell）。
同时，随着中继器和远程无线头（RRH）的引入，负责无线发送/接收的天线的位置改变（例如用于辅载波的发送/接收天线可以位于RRH，而用于主载波的发送/接收天线位于eNB），并且该情况下，优选的是获取到离终端位置近的接收天线的上行链路传输时序，而不是到离终端位置远的接收天线的上行链路传输时序。
这意味着可以存在多个上行链路传输时序，从而需要在包括多个上行链路传输时序的载波聚合场景中高效率地管理载波的方法。
发明内容
技术问题
设想本公开以解决以上问题。本公开目标在于提供用于高效率地发送上行链路信道的方法和装置，尤其是当在与UE在特定的小区中发送随机接入前同步码相同的定时在一个小区中有上行链路传输时。
解决方案
根据本公开的一方面，一种在支持至少一个载波的载波聚合的无线通信系统中用于终端向基站发送上行链路信道的方法包括：确定携载第一载波上的随机接入前同步码的子帧是否包括具有不同于第一载波的上行链路时序的上行链路时序的第二载波上的上行链路信道；当包括上行链路信道时，确定用于发送随机接入前同步码和上行链路信道所需的发送功率之和是否大于最大终端输出功率；以及当所需发送功率之和大于最大终端输出功率时，优先发送随机接入前同步码。
根据本公开的另一方面，一种在支持至少一个载波的载波聚合的无线通信系统中用于向基站发送上行链路信道的终端包括：收发器，其向基站发送并从基站接收；以及控制单元，其确定携载第一载波上的随机接入前同步码的子帧是否包括在具有不同于第一载波的上行链路时序的上行链路时序的第二载波上的上行链路信道，当包括上行链路信道时，确定用于发送随机接入前同步码和上行链路信道所需的发送功率之和是否大于最大终端输出功率，并且当所需发送功率之和大于最大终端输出功率时，控制优先发送随机接入前同步码。
有益效果
根据本公开，当在携载用于特定小区的随机接入前同步码的子帧中包括用于小区的上行链路信道时，UE能够高效率地发送随机接入前同步码或上行链路信道。
附图说明
图1是图解根据本公开的实施例的3GPP LTE系统的网络架构的图；
图2是图解应用本发明的LTE系统的协议栈的图；
图3是图解应用本发明的LTE系统中的载波聚合的示范性情形的图；
图4是图解应用本发明的基于OFDM的3GPP LTE系统中的上行链路时序同步的原理的图；
图5是图解载波聚合中需要多个上行链路时序的示范性场景的图；
图6是图解同时发送某一小区的随机接入信道和其他小区的非随机接入上行链路信道的示范性情况的图；
图7是图解根据本公开的实施例的处理图6的情况的UE过程的流程图；
图8是图解根据本公开的实施例的处理图6的情况的UE过程的流程图；以及
图9是图解根据本图7和8的实施例的UE的配置的框图。
具体实施方式
本公开提出用于处理同时发送用于特定小区的随机接入传输和用于另一小区的除随机接入前同步码之外的上行链路信道（例如物理上行链路共享信道（PUSCH））的情形的方法。
在特定小区（例如小区A）中执行随机接入传输以获取上行链路时序的示范性情况下，具有不同于特定小区的有效的上行链路时序的其他小区（例如小区B和C）可以执行上行链路传输而不管用于获取上行链路时序的特定小区中的随机接入传输。
在以上示例中，假定小区B和C必须具有不同于执行随机接入以获取上行链路时序的小区A的上行链路时序，并且当前已经获取并维持有效的上行链路时序。即，在以上示例中，特定小区中的随机接入传输和其他小区中的非随机接入上行链路信道同时发生。
在以上情况下，相比于其他小区中的非随机接入上行链路信道，UE优先处理随机接入传输。与其他小区中的非随机接入上行链路信道相比优先处理随机接入传输的原因在于，即使当随机接入信道和非随机接入上行链路信道传输的同时传输的可靠性不保证时（例如UE的上行链路发送功率不足），也要保证随机接入传输，放弃非随机接入上行链路信道传输，或者以初始要求的发送功率发送随机接入信道而以剩余功率发送其他小区中的非随机接入上行链路信道。
在另一实施例中，相比于随机接入传输，UE可以优先处理其他小区中的非随机接入上行链路信道。
在另一实施例中，UE可以在一个小区中的随机接入信道和其他小区中的非随机接入上行链路信道当中优先处理PCell的上行链路传输。该情况下，如果随机接入信道是PCell的，则相比于其他小区中的非随机接入上行链路信道优先发送随机接入信道；否则，如果随机接入信道不是PCell的（即SCell的随机接入信道），并且如果要求同时发送PCell中的非随机接入信道，则优先发送PCell中的非随机接入信道。
图1是图解根据本公开的实施例的3GPP LTE系统的网络架构的图。根据本公开的实施例，LTE网络包括演进节点B（eNB）105、110、115、和120、移动性管理实体（MME）125、以及服务网关（S-GW）130。用户设备（下文称为UE）135经由eNB105、110、115、和120以及S-GW130连接至外部网络。用户设备（UE）135通过eNB105和SGW130连接至外部网络。eNB105、110、115、和120与UMTS系统的传统节点B对应。eNB105与UE135建立无线信道，并且eNB105负责与传统节点B相比复杂的功能。
在LTE系统中，通过共享信道提供包括诸如网络电话（VoIP）的实时业务的所有用户通信量，因而需要位于eNB的设备来基于诸如UE缓冲器条件、功率余量状态、和信道状态的状态信息来调度数据。典型地，一个eNB控制多个小区。为了保证高达100Mbps的数据速率，LTE系统采用正交频分复用（OFDM）作为无线接入技术。
此外，LTE系统采用自适应调制和编码（AMC）来适应于UE的信道条件而确定调制方案和信道编码速率。S-GW130是在MME125的控制下提供数据承载以便建立和释放数据承载的实体。MME125负责各种控制功能，并且连接至多个eNB105、110、115、和120。
图2是图解应用本发明的LTE系统的协议栈的图。参照图2，LTE系统的协议栈包括分组数据会聚协议（PDCP）205和240、无线链路控制（RLC）210和235、媒体访问控制（MAC）215和230、以及物理（PHY）220和225。
PDCP负责IP首标压缩/解压缩、加密、和完整性保护。RRC定义上层控制信息消息传输和用于处理无线资源的相关操作和过程。RLC负责将PDCP协议数据单元（PDU）分割为合适尺寸。
MAC负责建立到多个RLC实体的连接，以便将RLC PDU复用为MAC PDU，以及将MACPDU解复用为RLC PDU。PHY对MAC PDU执行信道编码，并且将MAC PDU调制为OFDM码元以在无线信道上发送，或者对所接收的OFDM码元执行解调和信道解码，并且向上层传递解码的数据。
图3是图解应用本发明的LTE系统中的载波聚合的示范性情形的图。参照图3，一般地eNB可以使用在不同频带中发送和接收的多个载波。例如，eNB305可以被配置为使用中心频率为f1的载波315和中心频率为f3的载波310。如果不支持载波聚合，则UE330必须使用载波310和315之一来发送/接收数据。但是，具有载波聚合能力的UE330可以使用载波310和315两者来发送/接收数据。
eNB可以适应于具有载波聚合能力的UE的信道条件而增加要分配给UE的资源量，从而提高UE的数据速率。虽然以上描述针对eNB的发送器方面，但是也可以以相同方式适用于eNB的接收器方面。不同于使用多个载波之一发送数据的传统UE，启动载波聚合的终端能够同时使用多个载波发送数据从而增加数据速率。
在作为常规概念为小区配置一个下行链路载波和一个上行链路载波的情况下，载波聚合可以被理解为就像UE经由多个小区通信数据。利用载波聚合，峰数据速率与聚合的载波数目成比例地增加。
以下描述中，表达“UE通过某一下行链路载波接收数据或通过某一上行链路载波发送数据”意味着通过与下行链路和上行链路载波的中心频率和频带对应的小区中提供的控制和数据信道来发送或接收数据。虽然为了说明方便，描述针对LTE移动通信系统，但是本发明也可以应用于支持载波聚合的其他类型的无线通信系统。
图4是图解应用本发明的基于OFDM的3GPP LTE系统中的上行链路时序同步的原理的图。UE1的位置靠近eNB而UE2的位置远离eNB。
T_pro1指示到UE1的第一传播延迟时间，而T_pro2指示到UE2的第二传播延迟。UE1的位置相比于UE2靠近于eNB，因而具有相对短的传播延迟（图4中，T_pro1是0.333us，而T_pro2是3.33us）。
eNB的小区内的UE1和UE2的初始上行链路时序与eNB找到的小区内的UE的上行链路时序不匹配。参考标号401表示UE1的上行链路OFDM码元传输时序，而参考标号403表示UE2的上行链路OFDM码元传输时序。
注意到UE1和UE2的上行链路传输传播延迟，eNB可以在参考标号407和409表示的时序接收上行链路OFDM码元。UE1的上行链路码元经过短传播延迟之后由eNB在时序407接收，而UE2的上行链路码元经过相对长的传播延迟之后由eNB在时序409接收。
参考标号405表示eNB的参考接收时序。由于时序407和409在UE1和UE2的上行链路传输时序之间的同步之前，所以eNB的上行链路OFDM码元接收和解码开始时序405、UE1的上行链路OFDM码元接收时序407、以及UE2的上行链路OFDM码元接收时序409彼此不同。该情况下，UE1和UE2发送的上行链路码元不正交以致彼此干扰，结果，由于干扰以及上行链路码元接收时序407和409之间的不匹配，eNB很可能无法解码UE1和UE2在时序401和403发送的上行链路码元。
上行链路时序同步是用于获取eNB与UE1和UE2的上行链路码元接收时序的过程，并且如果上行链路时序同步过程完成，则eNB如参考标号411、413和415所示接收上行链路OFDM码元以获取解码开始时序。在上行链路时序同步过程中，eNB向UE发送时序提前（下文中称为TA）信息以通知时序调整量。
TA信息可以在响应于由UE发送的用于初始接入的随机接入前同步码的随机接入响应（RAR）消息中发送，或者在时序提前开始MAC控制元素（TAC MAC CE）中发送。
图5是图解载波聚合中需要多个上行链路时序的示范性场景的图。将在频带F2507上工作的远程无线头（RRH）503部署在使用频带F1505的宏eNB501周围。
如果UE使用宏eNB和RRH两者（即，如果靠近RRH503的UE聚合F1频带和F2频带用于上行链路传输），则UE与RRH之间的下行链路/上行链路传输具有短传播延迟，而UE与宏eNB之间的下行链路/上行链路传输具有相对长的传播延迟。这意味着到RRH的上行链路传输时序不同于到宏eNB的上行链路传输时序。在以上载波聚合场景中需要多个上行链路传输时序，并且为了获取初始上行链路传输时序，有必要通过用于RRH的F2上的随机接入过程配置上行链路传输时序，并通过用于宏eNB的F1上的随机接入过程配置另一上行链路传输时序。
这意味着，如果载波聚合中存在多个上行链路传输时序，则有必要在多个小区中执行随机接入过程用于同步上行链路传输时序。（没有必要在多个小区中同时执行随机接入过程。）
在本公开中，将具有相同上行链路时序的载波分类为时序提前组（TAG）。例如，如果聚合一个PCell和三个SCell A、B、和C，PCell和SCell A具有相同的上行链路时序，并且SCell B和SCell C具有相同的上行链路时序，则可以将PCell和SCell A分类为TAG#0，并且将SCell B和SCell C分类为TAG#1。
包括PCell的TAG#0被称为主TAG（PTAG），而不包括PCell的TAG#1被称为STAG。PCell是最初已对其执行RRC连接建立的在主载波上工作的服务小区，或者切换（HO）目标小区。
图6是图解同时发送某一小区的随机接入信道和其他小区的非随机接入上行链路信道的示范性情况的图。参考标号601表示在载波聚合模式下工作的UE，并且参考标号611表示控制聚合载波的服务小区的eNB。
图6中，假定在载波聚合中使用在主载波和辅载波上工作的总共4个服务小区（PCell621、SCell#1723、SCell#2625、和SCell#3627），并且PCell和SCell#1具有相同的上行链路传输时序，并且SCell#2和SCell#3具有相同的上行链路时序（PCell和SCell#1的上行链路时序与SCell#2和SCell#3的上行链路时序彼此不同）。
如果UE601在操作631维持用于PCell和SCell#1的有效的上行链路传输时序，但是不具有用于SCell#2和SCell#3的有效的上行链路传输时序信息，则eNB在操作641命令UE在开始通过SCell#2和SCell#3开始数据传输之前在SCell#2中执行随机接入过程以获取用于SCell#2和SCell#3的上行链路传输时序信息。命令消息可以是TS36.212PHY中规定的PDCCH命令消息。
如果接收到用于SCell#2的随机接入过程命令，则UE601在操作661使用开环功率控制通过SCell#2发送随机接入前同步码。因为维持用于PCell和SCell#1的有效的上行链路传输时序，所以在（根据之前接收的上行链路调度信息或半静态地配置的）通过SCell#2发送随机接入前同步码的时序在PCell和SCell#1中可能存在上行链路传输，并且该情况下，非随机接入上行链路信道（例如物理上行链路共享信道（PUSCH））传输663和665可能与SCell#2中的随机接入前同步码传输同时（在同一子帧中）出现在PCell和SCell#1中。
图7是图解根据本公开的实施例的处理图6的情况的UE过程的流程图。
如果在操作701在SCell或PCell中出现随机接入传输，则UE在操作711检查在与随机接入传输的相同时序/子帧是否在其他小区中存在任何非随机接入上行链路（UL）信道传输。如果仅存在随机接入传输，则在操作721在对应小区中如所调度的执行随机接入传输。
否则，如果在其他小区中出现任何非随机接入UL信道传输，则UE在操作731计算用于发送随机接入信道和其他小区中的非随机接入上行链路信道所需的发送功率的总和。可以使用下面的等式来计算用于随机接入传输所需的发送功率。
PPRACH=min{PCMAX,c(i),PREAMBLE_RECEIVED_TARGET_POWER+PLC}_[dBm]
PPRACH:随机接入前同步码传输功率
PCMAX,c(i):用于发送随机接入信道的SCell或PCell配置的UE输出功率
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
preambleInitialReceivedTargetPower:eNB通过RRC层消息信号通知的用于随机接入传输的开环功率控制的值
DELTA_PREAMBLE:依赖于要发送的随机接入前同步码的形成（formation）确定的功率调整值
PREAMBLE_TRANSMISSION_COUNTER:随机接入前同步码传输次数
powerRampingStep:在连续的随机接入传输之间应用的功率偏移值（即，用于第二随机接入传输的功率与第一随机接入传输相比增加powerRampingStep功率偏移值）
PLC:基于路径损耗参考小区计算的路径损耗估计值
可以使用下面的等式来计算用于在其他小区中发送非随机接入上行链路信道所需要的功率（即，PUSCH发送功率）之和：
PUSCH发送功率计算示例1（UE不同时发送PUSCH和PUCCH）
PUSCH发送功率计算示例1（UE同时发送PUSCH和PUCCH）
在以上等式中，PCMAX,c(i)表示在服务小区c中在子帧i配置的UE发送功率。PLC表示被配置为提供用在服务小区c中的路径损耗的参考小区中的路径损耗。用于确定某一服务小区中的上行链路发送功率的路径损耗可以是对应小区的下行链路信道上的路径损耗、或者不同小区的下行链路信道上的路径损耗。eNB在呼叫建立过程中向UE通知要使用的路径损耗。
fC(i)表示在服务小区c中的传输功率控制的累积值。PO_PUSCH,c表示作为小区特定和UE特定的值之和的上层参数。αC表示以从上层提供的3位小区特定的值在计算上行链路传输功率时应用于路径损耗的权重（即，此值越大，路径损耗对上行链路发送功率越有影响）。
虽然描述针对PUSCH为其他小区中发送的非随机接入上行链路信道的情况，但是非随机接入上行链路信道可以是诸如物理上行链路控制信道（PUCCH）和声探参考码元（SRS）的其他信道。
然而，如果存在PUCCH和SRS传输，则可以应用不同的所需功率的计算公式。可以通过参考3GPP TS36.213E-UTRA物理层过程来获取关于PUCCH和SRS的所需发送功率的计算的详细描述。
PUSCH是携载诸如MAC和RRC的上层的控制信息或数据的物理信道，PUCCH是携载PHY层控制信息（例如调度请求（SR）、信道质量信息（CQI）和混合ARQ（HARQ）确认信息）的物理信道，并且SRS是携载eNB的上行链路信道估计中使用的PHY控制信息的物理信道。
UE在操作741检查已在操作731计算出的随机接入传输和其他小区中的非随机接入上行链路信道传输所需的功率之和是否大于UE的总配置最大UE输出功率。可以将UE的总最大UE输出功率转换为线性值供使用。
如果传输所需之和不大于总最大UE输出功率，则UE在操作751同时发送随机接入信道和其他小区中的非随机接入上行链路信道。
否则，如果传输所需之和大于总最大UE输出功率，则UE在操作761优先处理随机接入传输。即，UE如所调度的在对应小区中发送随机接入信道。然而，UE不同时发送（放弃发送）随机接入上行链路信道。
虽然图7针对这样的情况，如果（例如由于UE的上行链路发送功率不足）难以可靠地发送随机接入信道和其他小区中的非随机接入上行链路信道两者，则相比于其他小区中的非随机接入上行链路信道，UE优先处理随机接入传输，但是也可以相比于随机接入传输而优先处理其他小区中的非随机接入上行链路信道。
该情况下，UE在操作761优先处理其他小区中的非随机接入上行链路信道传输，使得如所调度地发送其他小区中的非随机接入上行链路信道传输，但是取消（放弃）随机接入传输。
在另一实施例中，依赖于随机接入信道和非随机接入上行链路信道的哪个在PCell中发送，来确定随机接入信道和非随机接入上行链路信道的传输优先级。
如果随机接入信道正在PCll中发送，则UE在操作761优先处理随机接入传输（并且放弃非随机接入上行链路信道传输），否则，如果非随机接入上行链路信道正在PCell中发送，则UE在操作761优先处理非随机接入上行链路信道传输，但是取消（放弃）随机接入信道传输。
图8是图解根据本公开的实施例的处理图6的情况的UE过程的流程图。
如果在操作801在SCell或PCell中出现随机接入传输，则UE在操作811检查在与随机接入传输的相同时序/子帧是否在其他小区中存在任何非随机接入上行链路（UL）信道传输。
如果仅存在随机接入传输，则在操作821在对应小区中如所调度的执行随机接入传输。否则，如果在其他小区中出现任何非随机接入UL信道传输，则UE在操作831计算用于发送随机接入信道和其他小区中的非随机接入上行链路信道所需的发送功率的总和。可以使用下面的等式来计算随机接入传输所需要的发送功率。
PPRACH=min{PCAMX,c(i),PREAMBLE_RECEIVED_TARGET_POWER+PLC}_[dBm]
PPRACH:随机接入前同步码传输功率
PCAMX,c(i):用于发送随机接入信道的SCell或PCell配置的UE输出功率
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
preambleInitialReceivedTargetPower:eNB通过RRC层消息信号通知的用于随机接入传输的开环功率控制的值
DELTA_PREAMBLE:依赖于要发送的随机接入前同步码的形成确定的功率调整值
PREAMBLE_TRANSMISSION_COUNTER:随机接入前同步码传输次数
powerRampingStep:在连续的随机接入传输之间应用的功率偏移值（即，用于第二随机接入传输的功率与第一随机接入传输相比增加powerRampingStep功率偏移值）
PLC:基于路径损耗参考小区计算的路径损耗估计值
可以使用下面的等式来计算用于在其他小区中发送非随机接入上行链路信道所需的功率（即，PUSCH发送功率）之和：
PUSCH发送功率计算示例1（UE不同时发送PUSCH和PUCCH）
PUSCH发送功率计算示例1（UE同时发送PUSCH和PUCCH）
在以上等式中，PCMAX,c(i)表示在服务小区c中在子帧i配置的UE发送功率。PLC表示被配置为提供用在服务小区c中的路径损耗的参考小区中的路径损耗。用于确定某一服务小区中的上行链路发送功率的路径损耗可以是对应小区的下行链路信道上的路径损耗，或者不同小区的下行链路信道上的路径损耗。eNB在呼叫建立过程中向UE通知要使用的路径损耗。
fC(i)表示在服务小区c中的传输功率控制的累积值。PO_PUSCH,c表示作为小区特定和UE特定的值之和的上层参数。αc表示以从上层提供的3位小区特定的值在计算上行链路传输功率时应用于路径损耗的权重（即，此值越大，路径损耗对上行链路发送功率越有影响）。
虽然描述针对PUSCH为其他小区中发送的非随机接入上行链路信道的情况，但是非随机接入上行链路信道可以是诸如物理上行链路控制信道（PUCCH）和声探参考码元（SRS）的其他信道。然而，如果存在PUCCH和SRS传输，则可以应用不同的所需功率的计算公式。可以通过参考3GPP TS36.213E-UTRA物理层过程来获取关于PUCCH和SRS的所需发送功率的计算的详细描述。
PUSCH是携载诸如MAC和RRC的上层的控制信息或数据的物理信道，PUCCH是携载PHY层控制信息（例如调度请求（SR）、信道质量信息（CQI）和混合ARQ（HARQ）确认信息）的物理信道，并且SRS是携载eNB的上行链路信道估计中使用的PHY控制信息的物理信道。
UE在操作841检查已在操作831计算出的用于随机接入传输和其他小区中的非随机接入上行链路信道传输所需的功率之和是否大于UE的总配置最大UE输出功率。可以将UE的总最大UE输出功率转换为线性值供使用。如果传输所需之和不大于总最大UE输出功率，则UE在操作751同时发送随机接入信道和其他小区中的非随机接入上行链路信道。
否则，如果传输所需之和大于总最大UE输出功率，则UE在操作861优先处理随机接入传输。即，UE如所调度的在对应小区中发送随机接入信道。然而，UE不同时发送（放弃发送）随机接入上行链路信道。
虽然图8针对这样的情况，如果（例如由于UE的上行链路发送功率不足）难以可靠地发送随机接入信道和其他小区中的非随机接入上行链路信道两者，则相比于其他小区中的非随机接入上行链路信道，UE优先处理随机接入传输，但是也可以相比于随机接入传输而优先处理其他小区中的非随机接入上行链路信道。
该情况下，UE在操作861优先处理其他小区中的非随机接入上行链路信道传输，使得如调度的发送其他小区中的非随机接入上行链路信道传输，但是以在分配用在发送其他小区中的非随机接入上行链路信道中的功率之后剩下的残余功率来执行随机接入传输。
在另一实施例中，依赖于随机接入信道和非随机接入上行链路信道的哪个在PCell中发送，来确定随机接入信道和非随机接入上行链路信道的传输优先级。
如果随机接入信道正在PCell中发送，则UE在操作861优先处理随机接入传输（以如分配的所需发送功率发送随机接入信道，但是以在用于随机接入传输的功率分配之后可用的发送功率来发送其他小区中的非随机接入上行链路信道）；否则，如果非随机接入上行链路信道正在PCell中发送，则UE在操作861优先处理非随机接入上行链路信道传输（以如分配的所需发送功率发送其他小区中的非随机接入上行链路信道，但是以在用于其他小区中的非随机接入上行链路信道传输的功率分配之后可用的发送功率来发送随机接入信道）。
图9是图解根据本图7和8的实施例的UE的配置的框图。
UE利用收发器901通过与eNB建立的多个服务小区接收下行链路控制信息/数据，并且执行随机接入传输和其他小区中的非随机接入上行链路信道传输。收发器可以包括用于多个服务小区的至少一个RF信道。
功率计算和控制单元921计算用于随机接入和非随机接入上行链路信道传输所需的功率，并且分配用于随机接入和上行链路信道传输的功率。
当用于发送随机接入和其他小区中的非随机接入上行链路信道所需的发送功率之和大于总最大UE输出功率时，调度器根据优先级选择性地丢弃随机接入和非随机接入上行链路信道传输中的任何一个。
虽然已经使用特定术语描述本发明的优选实施例，但是说明书和附图应当被认为是说明性的而不是限制性的意义，以便帮助理解本发明。对于本领域技术人员来说明显的是，可以对其进行各种修改和改变而不脱离本发明的较广精神和范围。

Claims (12)

1.一种在支持至少一个载波的载波聚合的无线通信系统中用于终端向基站发送上行链路信道的方法，该方法包括：
确定携载第一载波上的随机接入前同步码的子帧是否包括具有不同于第一载波的上行链路时序的上行链路时序的第二载波上的上行链路信道；
当包括上行链路信道时，确定用于发送随机接入前同步码和上行链路信道所需的发送功率之和是否大于最大终端输出功率；以及
当所需发送功率之和大于最大终端输出功率时，优先发送随机接入前同步码。
2.如权利要求1所述的方法，进一步包括以下之一：取消上行链路信道的传输、和以在分配用于随机接入前同步码传输所需的功率之后剩下的功率来发送上行链路信道。
3.如权利要求1所述的方法，其中所述发送包括与随机接入前同步码相比优先发送上行链路信道。
4.如权利要求3所述的方法，进一步包括以下之一：取消随机接入前同步码的传输、和以在分配用于上行链路信道传输所需的功率之后剩下的功率来发送随机接入前同步码。
5.如权利要求1所述的方法，其中所述发送包括：当第一载波是主载波时，与上行链路信道相比优先发送随机接入前同步码，而当第二载波是主载波时，与随机接入前同步码相比优先发送上行链路信道。
6.如权利要求5所述的方法，当第一载波是主载波时，该方法进一步包括以下之一：取消上行链路信道的传输、和以在分配用于随机接入前同步码传输所需的功率之后剩下的功率来发送上行链路信道，而当第二载波是主载波时，该方法进一步包括以下之一：取消随机接入前同步码的传输、和以在分配用于上行链路信道传输所需的功率之后剩下的功率来发送随机接入前同步码。
7.一种在支持至少一个载波的载波聚合的无线通信系统中用于向基站发送上行链路信道的终端，该终端包括：
收发器，其向基站发送并从基站接收；以及
控制单元，其确定携载第一载波上的随机接入前同步码的子帧是否包括具有不同于第一载波的上行链路时序的上行链路时序的第二载波上的上行链路信道，当包括上行链路信道时，确定用于发送随机接入前同步码和上行链路信道所需的发送功率之和是否大于最大终端输出功率，并且当所需发送功率之和大于最大终端输出功率时，控制优先发送随机接入前同步码。
8.如权利要求7所述的终端，其中控制单元控制取消上行链路信道的传输，或者以在分配用于随机接入前同步码传输所需的功率之后剩下的功率来发送上行链路信道。
9.如权利要求7所述的终端，其中控制单元控制与随机接入前同步码相比优先发送上行链路信道。
10.如权利要求9所述的终端，其中控制单元控制取消随机接入前同步码的传输，或者以在分配用于上行链路信道传输所需的功率之后剩下的功率来发送随机接入前同步码。
11.如权利要求7所述的终端，其中当第一载波是主载波时，控制单元控制与上行链路信道相比优先发送随机接入前同步码，而当第二载波是主载波时，控制单元控制与随机接入前同步码相比优先发送上行链路信道。
12.如权利要求11所述的终端，其中当第一载波是主载波时，控制单元控制取消上行链路信道的传输、或者以在分配用于随机接入前同步码传输所需的功率之后剩下的功率来发送上行链路信道，而当第二载波是主载波时，控制单元控制取消随机接入前同步码的传输、或者以在分配用于上行链路信道传输所需的功率之后剩下的功率来发送随机接入前同步码。
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