CN101043671A - 一种控制用户终端读取系统消息的方法与系统 - Google Patents

一种控制用户终端读取系统消息的方法与系统 Download PDF

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CN101043671A
CN101043671A CNA2006100828794A CN200610082879A CN101043671A CN 101043671 A CN101043671 A CN 101043671A CN A2006100828794 A CNA2006100828794 A CN A2006100828794A CN 200610082879 A CN200610082879 A CN 200610082879A CN 101043671 A CN101043671 A CN 101043671A
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indication message
message
user terminal
system message
submodule
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CN100466849C (zh
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胡灏
陆志宏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

本发明公开了一种控制用户终端读取系统消息的方法，包括：当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；用户终端接收所述指示消息后，根据所述调度信息读取改变后的系统消息。本发明还公开了一种控制用户终端读取系统消息的系统。本发明实现了长期演进LTE系统中采用OFDM技术的激活状态下的UE也能正常获取系统消息，从而使得UE从激活状态到空闲状态再到激活状态的过渡时间很短，提高了整个通信系统的接入性能，提升了用户的业务感受。

Description

一种控制用户终端读取系统消息的方法与系统
技术领域
本发明涉及长期演进(long-term evolution，LTE)系统，尤其涉及一种控制采用正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术的用户终端读取系统消息的方法与系统。
背景技术
系统消息包括：用户终端(UE)的定时器和计数器，公共陆地移动网(PublicLand Mobile Network；PLMN)的标识符(ID)，登记区域ID，小区选择和重选所需要的参数；小区的ID，公共信道的配置信息，测量控制消息等等。
现有技术中，系统消息采用主消息块(Main Information Block，MIB)和系统消息块(System Information Block，SIB)的方式通过广播信道(BroadcastChannel，BCH)发送。由于BCH是要让整个小区内的UE都能收到，所以它采用固定的较低速率和固定的传输格式。
UE开机后或处于空闲(Idle)状态进入新的小区时，捕获小区同步信道，然后捕获该小区BCH，读取主消息块和系统消息块。当系统消息发生变化时，网络侧通过寻呼信道(PCH，paging channel)发送寻呼消息，UE收到该消息后读取其中的主消息块标签值，如果发现主消息块的标签值和它存储的主消息块标签值不同，则读取广播信道(BCH)，根据主消息块里包含的系统消息块的标签值，决定读取广播信道上的哪个系统消息块。
对于处于CELL-FACH状态的UE，当系统消息发生变化时，网络侧通过前向信道(Forward Access Channel，FACH)发送系统消息变化指示，UE收到该指示后读取主消息块的标签值，如果发现主消息块的标签值和它存储的主消息块的标签不同，则读取广播信道(BCH)，根据主消息块里包含的系统消息块的标签值决定该读取广播信道上的哪个系统消息块。
现有技术中，对于采用频分双工(Frequency division duplex，FDD)处于小区专用信道(CELL_DCH)下的UE，只有能够同时接受辅公共控制物理信道(Supplemental-Common Control Physical Channel，S-CCPCH)和专用信道(Dedicated Channel，DCH)的UE才能够接受变化的系统消息，一般的UE没法实现。
因此，现有技术存在如下缺点：
由于一般UE无法在CELL_DCH下正常接受变化的系统消息，当UE从激活态转入空闲态时要进行小区选择，这时如果有突发的数据发送给UE，UE需要读取选择小区的广播消息，然后才能转入激活状态，这使得UE响应不及时。
对于LTE系统，采用了OFDM技术。OFDM技术是一种多载波调制方式。在传统的频分复用(Frequency Division Multiple，FDM)系统中，各载波上的信号频谱没有重叠，以便接收机中能用传统的滤波器方法将其分离、提取，这样做的最大缺点是频谱利用率低，造成频谱浪费。OFDM技术区分各个子信道的方法是利用各个子载波之间严格的正交性。它允许子载波频谱部分重叠，只要满足子载波间相互正交则可以从混叠的子载波上分离出数据信息，所以在OFDM技术下，UE可以实现同时接受不同信道的信号。因此，本发明基于LTE系统中采用OFDM技术的UE可以同时接受不同信道的信号这一基础，提出一种处于激活状态下的UE如何读取系统消息的方法。
发明内容
本发明提供一种控制用户终端读取系统消息的方法，应用于LTE系统中采用OFDM技术的UE处于激活状态下时实现读取变化的系统消息，克服现有技术中由于激活态的UE一般不能正常接收系统消息使得UE响应不及时的问题。
根据本发明的方法，本发明另提供一种相对应的控制用户终端读取系统消息的系统。
本发明方法包括：
A、当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息对应的调度信息；
B、用户终端接收所述指示消息后，根据所述调度信息读取改变后的系统消息。
根据本发明的上述方法，所述步骤A中，由网络侧的无线资源控制RRC实体发送所述指示消息。
所述RRC实体通过下行共享信道的控制信道发送所述指示消息。
根据本发明的上述方法，所述步骤A之前还包括：
所述RRC实体判断系统消息是否改变，如果系统消息已改变，则执行所述步骤A。
根据本发明的上述方法，所述步骤A中，在所述指示消息中还携带用户终端记录信息；
所述步骤B中，用户终端接收所述指示消息后，根据所述用户终端记录信息判断自身是否是该指示消息的接收端；如果是，则按照所述调度信息中指示的位置信息读取变化后的系统消息；否则，丢弃该指示消息。
根据本发明的上述方法，所述步骤A中，在所述指示消息中还携带用以表明是否为同一条指示消息的指示消息标签值；
所述步骤B中，用户终端接收所述指示消息后，判断是否已收到具有相同标签值的所述指示消息；如果没有收到，则按照所述调度信息中指示的位置信息读取变化后的系统消息；否则，丢弃该指示消息。
本发明提供一种控制用户终端读取系统消息的系统，包括：
指示消息生成模块，用于当系统消息发生改变时给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；指示消息接收执行模块，设置于用户终端，用于接收所述指示消息，并根据所述调度信息读取改变后的系统消息。
所述指示消息生成模块设置于RRC实体中。
所述指示消息生成模块，包括：
判断子模块，用于判断系统消息是否改变，当判断出系统消息改变时，输出信号给生成子模块；
生成子模块，接收到所述判断子模块的输出信号后，生成指示消息并传送给发送子模块；在生成的指示消息中包含激活状态下的用户终端记录信息、指示消息标签值和改变后的系统消息的调度信息；
发送子模块，将接收的指示消息通过下行共享信道的控制信道发送给用户终端。
所述指示消息接收执行模块，包括：
指示消息接收判断子模块，接收所述指示消息，根据指示消息中携带的用户终端记录信息，判断自身是否是该指示消息的接收端；根据指示消息中携带的指示消息标签值，判断是否已收到具有相同标签值的所述指示消息；当判断出自身是该指示消息接收端且没有收到相同标签值的所述指示消息时，输出信号给指示消息解析子模块；
指示消息解析子模块，解析所述指示消息中携带的调度信息，输出给系统消息读取子模块；
系统消息读取子模块，根据调度信息中指示的位置信息读取改变后的系统消息。
本发明有益效果如下：
(1)采用本发明，当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；用户终端接收指示消息后，按照所述调度信息读取改变后的系统消息。这样，处于激活状态的UE根据指示消息去读取变化后的系统消息，既实现了获取变化后的系统消息的目的，又不必总是去解读系统消息。实现方法简单有效。
(2)本发明采用由网络侧的无线资源控制RRC实体通过下行共享信道的控制信道发送指示消息，不必额外增加网络功能实体，控制简单成本低。
(3)采用本发明，实现了激活状态下的UE也能正常获取系统消息，从而使得UE从激活态到空闲态再到激活态的过渡时间很短，提高了整个通信系统的接入性能，提升了用户的业务感受。
附图说明
图1为本发明方法信令流程图；
图2为本发明方法步骤流程图；
图3为本发明提供的控制用户终端读取系统消息的系统结构示意图。
具体实施方式
本发明提供一种控制用户终端读取系统消息的方法，应用于LTE系统中采用OFDM技术的UE处于激活状态下时读取变化的系统消息，该方法包括：
当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；用户终端接收指示消息后，根据所述调度信息读取改变后的系统消息。
图1为本发明方法的信令流程示意图，包括：
1、网络侧实体(如采用无线资源控制RRC实体)判断系统消息是否改变，当系统消息发生改变时，生成携带改变后的系统消息的调度信息的指示消息；
2、发送生成的指示消息给UE；
3、UE收到指示消息后，根据指示消息中携带的调度信息读取改变后的系统消息。
下面对本发明的上述方法进行详细描述。参见图2，为本发明一具体实施例的步骤流程图，包括：
步骤S11、RRC判断系统消息是否改变，如果系统消息已改变，则执行步骤S12。
由于系统消息受RRC控制管理，RRC检测当前系统消息和上一次发送的系统消息是否相同，如果不同，则判断系统消息已改变。
步骤S12、通过下行共享信道的控制信道发送指示消息给UE。
在该步骤中，先生成指示消息，该指示消息中携带的信息信元如下表1所示：
                          表1：
 信息单元   说明
 UE record(用户终端记录)   标识哪些UE应该读此指示消息
 指示消息标签值   标识是否是同一条消息(整数1-256)
 调度信息   指示UE应该在什么位置去读取变化后的系统消息
其中，调度信息包含的具体内容可如下表2所示：
                            表2：
 信息单元   说明
 >SEG_COUNT(段数)   标识系统消息块分的段数，整数1-最大的系统消息块的段数，缺省值为1
 >SIB_REP(系统消息块重复周期)   Integer(4，8，16，32，64，128，256，512，1024，2048，4096)标识系统消息块的重复周期
 >SIB_POS(系统消息块第一段的位置)   0...SIB_REP-2，以2为步长。
 >SIB_OFF(系统消息块偏置)   2-32，以2增长，标识各消息块的偏置
表2中，SIB_REP表示系统消息块每段的重复周期。如重复周期是4，表示：每4帧发送一次该段。
SIB_POS表示系统消息块第一段的位置，假设SIB_REP＝4，则系统消息块的第一段的位置的取值范围是0或者2。如果SIB_REP＝8，系统消息块的第一段的位置的取值范围是0，2，4，6。
SIB_OFF表示后面的段偏离前一段的偏离度，即：
SIB_POS(i)＝SIB_POS(i-1)+SIB_OFF。
RRC实体将携带用户终端记录、指示消息标签值和调度信息的指示消息通过下行共享信道的控制信道发送给UE。
步骤S13、UE接收到指示消息后，读取指示消息中携带的用户终端记录信息，继续步骤S14。
步骤S14、UE根据用户终端记录信息判断自身是否是该指示消息的接收端；如果是，继续步骤S15；否则，执行步骤S17。
步骤S15、UE读取指示消息中携带的指示消息标签值，进一步判断是否已收到具有相同标签值的所述指示消息；如果没有收到，则执行步骤S16；否则，执行步骤S17。
步骤S16、UE按照调度信息中指示的位置信息读取变化后的系统消息。
步骤S17、UE丢弃接收的指示消息，不作任何处理。
根据本发明的上述方法，本发明提供一种控制用户终端读取系统消息的系统，其结构示意图如图3所示，包括：
指示消息生成模块，用于当系统消息发生改变时给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；
指示消息接收执行模块，设置于用户终端，用于接收所述指示消息，并根据调度信息读取改变后的系统消息。
指示消息生成模块可以设置于RRC实体中。
其中，指示消息生成模块，包括：
判断子模块，用于判断系统消息是否改变，当判断出系统消息改变时，输出信号给生成子模块；
生成子模块，接收到判断子模块的输出信号后，生成指示消息并传送给发送子模块；在生成的指示消息中包含激活状态下的用户终端记录信息、指示消息标签值和改变后的系统消息的调度信息；
发送子模块，将接收的指示消息通过下行共享信道的控制信道发送。
其中，指示消息接收执行模块，包括：
指示消息接收判断子模块，接收指示消息，根据指示消息中携带的用户终端记录信息，判断自身是否是该指示消息的接收端；根据指示消息中携带的指示消息标签值，判断是否已收到具有相同标签值的指示消息；当判断出自身是该指示消息接收端且没有收到相同标签值的所述指示消息时，输出信号给指示消息解析子模块；
指示消息解析子模块，解析所述指示消息中携带的调度信息，输出给系统消息读取子模块；
系统消息读取子模块，根据调度信息中指示的位置信息读取改变后的系统消息。
综上所述，采用本发明，当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；用户终端接收指示消息后，按照所述调度信息中指示的读取时间和位置信息读取改变后的系统消息。这样，处于激活状态的UE根据指示消息去读取变化后的系统消息，既实现了获取变化后的系统消息的目的，又不必总是去解读系统消息。实现方法简单有效。
本发明采用由网络侧的无线资源控制RRC实体通过下行共享信道的控制信道发送指示消息，不必额外增加网络功能实体，控制简单成本低。
本发明实现了激活状态下的UE也能正常获取系统消息，从而使得UE从激活态到空闲态再到激活态的过渡时间很短，提高了整个通信系统的接入性能，提升了用户的业务感受。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (10)

1、一种控制用户终端读取系统消息的方法，其特征在于，包括：
A、当系统消息发生改变时，网络侧给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息对应的调度信息；
B、用户终端接收所述指示消息后，根据所述调度信息读取改变后的系统消息。
2、如权利要求1所述的方法，其特征在于，所述步骤A中，由网络侧的无线资源控制RRC实体发送所述指示消息。
3、如权利要求2所述的方法，其特征在于，所述RRC实体通过下行共享信道的控制信道发送所述指示消息。
4、如权利要求3所述的方法，其特征在于，所述步骤A之前还包括：
所述RRC实体判断系统消息是否改变，如果系统消息已改变，则执行所述步骤A。
5、如权利要求1-4任意权项所述的方法，其特征在于，所述步骤A中，在所述指示消息中还携带用户终端记录信息；
所述步骤B中，用户终端接收所述指示消息后，根据所述用户终端记录信息判断自身是否是该指示消息的接收端；如果是，则按照所述调度信息中指示的位置信息读取变化后的系统消息；否则，丢弃该指示消息。
6、如权利要求5所述的方法，其特征在于，所述步骤A中，在所述指示消息中还携带用以表明是否为同一条指示消息的指示消息标签值；
所述步骤B中，用户终端接收所述指示消息后，判断是否已收到具有相同标签值的所述指示消息；如果没有收到，则按照所述调度信息中指示的位置信息读取变化后的系统消息；否则，丢弃该指示消息。
7、一种控制用户终端读取系统消息的系统，其特征在于，包括：
指示消息生成模块，用于当系统消息发生改变时给激活状态下的用户终端发送指示消息，在该指示消息中携带改变后的系统消息的调度信息；
指示消息接收执行模块，设置于用户终端，用于接收所述指示消息，并根据所述调度信息读取改变后的系统消息。
8、如权利要求7所述的系统，其特征在于，所述指示消息生成模块设置于RRC实体中。
9、如权利要求8所述的系统，其特征在于，所述指示消息生成模块，包括：
判断子模块，用于判断系统消息是否改变，当判断出系统消息改变时，输出信号给生成子模块；
生成子模块，接收到所述判断子模块的输出信号后，生成指示消息并传送给发送子模块；在生成的指示消息中包含激活状态下的用户终端记录信息、指示消息标签值和改变后的系统消息的调度信息；
发送子模块，将接收的指示消息通过下行共享信道的控制信道发送给用户终端。
10、如权利要求9所述的系统，其特征在于，所述指示消息接收执行模块，包括：
指示消息接收判断子模块，接收所述指示消息，根据指示消息中携带的用户终端记录信息，判断自身是否是该指示消息的接收端；根据指示消息中携带的指示消息标签值，判断是否已收到具有相同标签值的所述指示消息；当判断出自身是该指示消息接收端且没有收到相同标签值的所述指示消息时，输出信号给指示消息解析子模块；
指示消息解析子模块，解析所述指示消息中携带的调度信息，输出给系统消息读取子模块；
系统消息读取子模块，根据调度信息中指示的位置信息读取改变后的系统消息。
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