CN101541036B - Working method and system of enhanced long-term evolution system terminal - Google Patents
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Abstract
本发明公开了一种增强长期演进系统终端的工作方法和系统，包括：处于连接态的增强长期演进系统终端不需借助于后向兼容载波上的信息支持，独立工作在非后向兼容载波上。本发明的方法简单有效，LTE-A终端在非后向兼容组成载波上传输数据时可以独立工作在一个该类组成载波上，不用监测其它组成载波，可为LTE-A终端提供灵活的工作机制，同时也有利于LTE-A终端的省电，LTE-A终端在空闲态只驻留在后向兼容载波的工作方式，简单有效地解决了随机接入过程中下行组成载波不明确的问题。而且本发明的方法对协议修改影响较小。
The invention discloses a working method and system for an enhanced long-term evolution system terminal, comprising: the enhanced long-term evolution system terminal in a connected state works independently on a non-backward compatible carrier without information support on a backward compatible carrier . The method of the present invention is simple and effective, and the LTE-A terminal can independently work on a component carrier of this type when transmitting data on a non-backward compatible component carrier, without monitoring other component carriers, and can provide a flexible working mechanism for the LTE-A terminal At the same time, it is also beneficial to the power saving of LTE-A terminals. The LTE-A terminal only resides on the backward compatible carrier in the idle state, which simply and effectively solves the problem that the downlink component carrier is not clear during the random access process. Moreover, the method of the present invention has little influence on protocol modification.
Description
技术领域 technical field
本发明涉及移动通信领域，尤其涉及增强长期演进(Long Term Evolution-Advanced，简称LTE-A)系统中LTE-A终端的工作方法和系统。The present invention relates to the field of mobile communications, in particular to a working method and system for an LTE-A terminal in an enhanced Long Term Evolution-Advanced (LTE-A) system.
背景技术 Background technique
随着移动产业的发展、以及用户对移动数据业务需求的不断增长，人们对移动通信的速率和服务质量(Qos)的要求越来越高，于是在第三代移动通信(3rd Generation，简称3G)还没有大规模商用之前，相关技术人员就已经开始了对下一代移动通信系统的研究和开发工作，其中比较典型的是第三代合作伙伴计划(3rd Generation Partnership Project，简称3GPP)启动的长期演进(Long Term Evolution，简称LTE)项目，LTE系统可提供的最高频谱带宽为20MHz(兆赫兹)。随着网络的进一步演进，LTE-A系统作为LTE系统的演进系统，可以提供高达100MHz的频谱带宽，支持更灵活更高质量的通信，同时要对LTE系统具备很好的后向兼容性。在LTE-A系统中有多个组成载波(CC，Component Carrier)，LTE-A终端可以同时工作在一个或多个组成载波上，而一个LTE终端只能工作在某一个后向兼容的组成载波上。With the development of the mobile industry and the increasing demand of users for mobile data services, people have higher and higher requirements for the speed and quality of service (Qos) of mobile communications. ) before large-scale commercial use, relevant technical personnel have already started the research and development of the next generation mobile communication system, which is more typical of the long-term project initiated by the 3rd Generation Partnership Project (3GPP). Evolution (Long Term Evolution, referred to as LTE) project, the highest spectrum bandwidth that the LTE system can provide is 20MHz (megahertz). With the further evolution of the network, the LTE-A system, as an evolution system of the LTE system, can provide up to 100MHz of spectrum bandwidth, support more flexible and higher-quality communications, and have good backward compatibility with the LTE system. There are multiple component carriers (CC, Component Carrier) in the LTE-A system, LTE-A terminals can work on one or more component carriers at the same time, and an LTE terminal can only work on a certain backward compatible component carrier superior.
在LTE-A系统的前期标准讨论中，讨论了可以支持上下行组成载波数非对称的情况。一般而言在系统的配置中，下行组成载波数大于上行组成载波数。在上下行组成载波数非对称的情况下，用户设备在上行组成载波上发送随机接入信道前导序列后，增强基站不知道在与此上行组成载波配对的哪一个下行组成载波上发送随机接入信道响应，对于后续过程中的无线资源控制(Radio Resource Control，简称RRC)连接建立消息(消息4)也存在下行组成载波不明确(或称作模糊性)问题。In the previous standard discussion of the LTE-A system, it was discussed that the asymmetry of the number of uplink and downlink component carriers can be supported. Generally speaking, in the configuration of the system, the number of downlink component carriers is greater than the number of uplink component carriers. When the number of uplink and downlink component carriers is asymmetric, after the user equipment sends the preamble sequence of the random access channel on the uplink component carrier, the enhanced base station does not know which downlink component carrier that is paired with the uplink component carrier to send the random access channel on. For the channel response, there is also the problem of ambiguity (or ambiguity) of the downlink component carrier for the Radio Resource Control (RRC) connection establishment message (message 4) in the subsequent process.
在标准[TS 36.101 840]版本中，增加了对LTE终端接收和发送数据的频率间隔的限制。LTE终端在各频带中的接收和发送数据的中心频率间隔需满足下表所示的要求：In the version of the standard [TS 36.101 840], a restriction on the frequency interval for receiving and sending data by LTE terminals was added. The center frequency intervals of LTE terminals receiving and sending data in each frequency band need to meet the requirements shown in the following table:
在上下行组成载波数非对称的情况下，不可能将所有下行组成载波都配置成后向兼容，对于LTE终端可接入的上行组成载波，其对应的下行组成载波中心频率也就确定了，这样，在小区特定的非对称上下行组成载波数时，由于LTE终端无法在非默认间隔的收发频率上工作，所以一般情况下与上行组成载波为非默认间隔关系的下行组成载波配置成非后向兼容载波，而将与上行组成载波满足上表限制的载波配置成后向兼容载波，于是，最常见的情况是，与一上行组成载波对应的后向兼容下行组成载波只有一个，与其相对应的非后向兼容下行组成载波有一个或多个。在此基础上，在存在非后向兼容组成载波的场景下LTE-A终端如何工作是一个需要确定的问题。When the number of uplink and downlink component carriers is asymmetrical, it is impossible to configure all downlink component carriers to be backward compatible. For the uplink component carriers accessible to LTE terminals, the corresponding downlink component carrier center frequency is also determined. In this way, when the number of asymmetric uplink and downlink component carriers is specific to a cell, since the LTE terminal cannot work on the transceiving frequency with a non-default interval, the downlink component carrier with a non-default spacing relationship with the uplink component carrier is generally configured as a non-backlink component carrier. backward compatible carrier, and the carrier that satisfies the restrictions in the above table with the uplink component carrier is configured as a backward compatible carrier. Therefore, the most common situation is that there is only one backward compatible downlink component carrier corresponding to an uplink component carrier, which corresponds to There are one or more non-backward compatible downlink component carriers. On this basis, how the LTE-A terminal works in the scenario where there are non-backward compatible component carriers is a problem that needs to be determined.
关于LTE-A终端的工作方式，一些厂家(如Nortel(R1-090762)、LG(R1-090779))的提议涉及要求连接态LTE-A终端工作时需要后向兼容组成载波配合一起工作。这种方式限制了LTE-A终端工作的自由度，非后向兼容组成载波上的连接态LTE-A终端必需与其它后向兼容组成载波配合一起工作，受到其它后向兼容组成载波的限制。Regarding the working mode of LTE-A terminals, some manufacturers (such as Nortel (R1-090762), LG (R1-090779)) have proposed that LTE-A terminals in connected state need to work together with backward compatible component carriers. This method limits the freedom of operation of LTE-A terminals. Connected LTE-A terminals on non-backward compatible component carriers must work together with other backward compatible component carriers, and are limited by other backward compatible component carriers.
高通公司在相关标准(参考“Qualcomm Europe，R1-090860，Notion ofanchor carrier in LTE-A，WG1_RL1 meeting 56”)中提到非后向兼容驻留载波和非后向兼容非驻留载波概念，前者支持空闲态和连接态的LTE-A终端，支持同步/广播/寻呼功能，后者仅支持连接态的LTE-A终端，UE不能驻留在该类载波上，支持系统信息更新功能，配有新的同步信号以保持同步。对于非后向兼容驻留载波，当空闲态LTE-A终端也可驻留时，小区特定的非对称载波聚合时初始接入过程中下行组成载波不明确问题仍需要解决，由此引入的修改影响有待评估；对于非后向兼容非驻留载波，LTE-A终端在连接态时仍需要后向兼容组成载波配合一起工作，受到其它后向兼容组成载波的限制。Qualcomm mentioned the concepts of non-backward compatible resident carrier and non-backward compatible non-resident carrier in relevant standards (refer to "Qualcomm Europe, R1-090860, Notion of anchor carrier in LTE-A, WG1_RL1 meeting 56"), the former Support LTE-A terminals in idle state and connected state, and support synchronization/broadcast/paging functions. The latter only supports LTE-A terminals in connected state. UE cannot reside on this type of carrier, and supports system information update function. There is a new sync signal to keep in sync. For non-backward compatible camping carriers, when idle LTE-A terminals can also camp on, the problem of ambiguity of downlink component carriers in the initial access process of cell-specific asymmetric carrier aggregation still needs to be solved, and the amendments introduced by this The impact needs to be evaluated; for non-backward compatible non-resident carriers, LTE-A terminals still need backward compatible component carriers to work together in the connected state, which is limited by other backward compatible component carriers.
发明内容 Contents of the invention
本发明要解决的技术问题是提供增强长期演进系统终端的工作方法和系统，提高LTE-A终端的工作自由度、并节省终端电力资源。The technical problem to be solved by the present invention is to provide a working method and system for an enhanced long-term evolution system terminal, improve the working freedom of an LTE-A terminal, and save terminal power resources.
针对现有技术方案在工作自由度、终端省电以及对协议修改的影响还考虑不足，本发明即是针对存在非后向兼容载波的场景下，提出了一种新的LTE-A终端工作方式，综合考虑了终端工作的自由度、终端省电以及协议的修改影响给出了一种连接态和空闲态的LTE-A工作方式。In view of the insufficient consideration of the existing technical solutions on the degree of freedom of work, terminal power saving, and the impact on protocol modification, the present invention proposes a new LTE-A terminal working mode for the scenario where there is a non-backward compatible carrier , considering the degree of freedom of terminal work, terminal power saving and the impact of protocol modification, a working mode of LTE-A in connected state and idle state is given.
为了解决上述技术问题，本发明提供了一种增强长期演进系统终端的工作方法，包括：处于连接态的增强长期演进系统终端不需借助于后向兼容载波上的信息支持，独立工作在非后向兼容载波上。In order to solve the above technical problems, the present invention provides a working method for an enhanced long-term evolution system terminal, including: the enhanced long-term evolution system terminal in the connected state does not need to rely on the information support on the backward compatible carrier, and independently works in the non-backward to a compatible carrier.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
增强基站在所述非后向兼容载波上提供所述增强长期演进系统终端在此非后向兼容载波上独立工作的系统配置参数。The enhanced base station provides system configuration parameters for the enhanced long term evolution system terminal to work independently on the non-backward compatible carrier on the non-backward compatible carrier.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
所述非后向兼容载波是指非后向兼容下行组成载波。The non-backward compatible carrier refers to a non-backward compatible downlink component carrier.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
处于空闲态的增强长期演进系统终端只驻留在后向兼容下行组成载波上。The Long-term Evolution-enhanced terminal in the idle state only camps on the backward compatible downlink component carrier.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
所述增强长期演进系统终端在所述后向兼容下行组成载波上与所述增强基站进行初始同步操作后，在与所述后向兼容下行组成载波对应的上行组成载波上发送随机接入前导消息，所述增强基站收到所述随机接入前导消息后在所述后向兼容下行组成载波上发送随机接入响应。After the enhanced long term evolution system terminal performs an initial synchronization operation with the enhanced base station on the backward compatible downlink component carrier, it sends a random access preamble message on the uplink component carrier corresponding to the backward compatible downlink component carrier The enhanced base station sends a random access response on the backward compatible downlink component carrier after receiving the random access preamble message.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
所述增强长期演进系统终端与所述增强基站之间建立无线资源控制连接过程中，所述增强基站在所述后向兼容下行组成载波上发送无线资源控制连接建立消息。In the process of establishing a radio resource control connection between the enhanced long term evolution system terminal and the enhanced base station, the enhanced base station sends a radio resource control connection establishment message on the backward compatible downlink component carrier.
进一步地，上述工作方法还可以具有以下特点：Further, the above working method may also have the following characteristics:
所述增强长期演进系统终端从连接态转为空闲态后，驻留在后向兼容载波上。After the terminal of the long-term evolution-enhanced system changes from the connected state to the idle state, it camps on the backward compatible carrier.
为了解决上述技术问题，本发明还提供了一种增强长期演进系统终端的工作系统，包括增强长期演进系统终端和增强基站，所述增强长期演进系统终端，用于在处于连接态时，不需借助于后向兼容载波的信息支持独立工作在非后向兼容载波上；所述增强基站，在所述非后向兼容载波上提供所述增强长期演进系统终端在此非后向兼容载波上独立工作的系统配置参数。In order to solve the above-mentioned technical problems, the present invention also provides a working system for an enhanced long-term evolution system terminal, including an enhanced long-term evolution system terminal and an enhanced base station, and the enhanced long-term evolution system terminal is used to not need Support independent operation on a non-backward compatible carrier by means of backward compatible carrier information; the enhanced base station provides the enhanced long-term evolution system terminal on the non-backward compatible carrier to independently work on the non-backward compatible carrier Working system configuration parameters.
进一步地，上述系统还可以具有以下特点：Further, the above system can also have the following characteristics:
所述增强长期演进系统终端，还用于在处于空闲态时，只驻留在后向兼容下行组成载波上。The enhanced long term evolution system terminal is further configured to only camp on the backward compatible downlink component carrier when in an idle state.
进一步地，上述系统还可以具有以下特点：Further, the above system can also have the following characteristics:
所述增强基站，还用于在与所述增强长期演进系统终端在所述后向兼容下行组成载波上进行初始同步操作，在与所述后向兼容下行组成载波对应的上行组成载波上收到随机接入前导消息后，在所述后向兼容下行组成载波上发送随机接入响应；并且与所述增强长期演进系统终端之间建立无线资源控制连接过程中，在所述后向兼容下行组成载波上发送无线资源控制连接建立消息。The enhanced base station is further configured to perform an initial synchronization operation with the enhanced long-term evolution system terminal on the backward compatible downlink component carrier, and receive After randomly accessing the preamble message, sending a random access response on the backward compatible downlink component carrier; A radio resource control connection establishment message is sent on the carrier.
本发明的方法简单有效，LTE-A终端在非后向兼容组成载波上传输数据时可以独立工作在一个该类组成载波上，不用监测其它组成载波，可为LTE-A终端提供灵活的工作机制，同时也有利于LTE-A终端的省电，LTE-A终端在空闲态只驻留在后向兼容载波的工作方式，简单有效地解决了随机接入过程中下行组成载波不明确的问题。而且本发明的方法对协议修改影响较小。The method of the present invention is simple and effective, and the LTE-A terminal can independently work on a component carrier of this type when transmitting data on a non-backward compatible component carrier, without monitoring other component carriers, and can provide a flexible working mechanism for the LTE-A terminal At the same time, it is also beneficial to the power saving of LTE-A terminals. The LTE-A terminal only resides on the backward compatible carrier in the idle state, which simply and effectively solves the problem that the downlink component carrier is not clear during the random access process. Moreover, the method of the present invention has little influence on protocol modification.
附图说明 Description of drawings
图1是实施例中LTE-A终端工作方法的示意图；FIG. 1 is a schematic diagram of an LTE-A terminal working method in an embodiment;
图2是具体实施例中上行组成载波和下行组成载波的示意图。Fig. 2 is a schematic diagram of an uplink component carrier and a downlink component carrier in a specific embodiment.
具体实施方式 Detailed ways
本发明的方法适用于存在非后向兼容组成载波的LTE-A系统。例如，当LTE-A系统下行组成载波数大于上行组成载波数时，由于LTE中不同的频带配置收发频率有不同的固定间隔(参考标准TS 36.101 840)，当系统下行组成载波数大于上行组成载波数时，也就存在非后向兼容组成载波的情形。The method of the present invention is applicable to the LTE-A system with non-backward compatible component carriers. For example, when the number of downlink component carriers in the LTE-A system is greater than the number of uplink component carriers, since different frequency band configurations in LTE have different fixed intervals for sending and receiving frequencies (refer to standard TS 36.101 840), when the number of downlink component carriers in the system is greater than the uplink component carriers When the number is high, there is also the case of non-backward compatible constituent carriers.
实施例中非后向兼容载波指，LTE-A系统中不支持LTE终端的载波。LTE-A终端的连接态是指LTE-A终端建立了RRC连接；LTE-A终端的空闲态是指LTE-A终端未建立RRC连接。The non-backward compatible carrier in the embodiment refers to a carrier that does not support LTE terminals in the LTE-A system. The connected state of the LTE-A terminal means that the LTE-A terminal has established an RRC connection; the idle state of the LTE-A terminal means that the LTE-A terminal has not established an RRC connection.
LTE-A终端的工作系统包括LTE-A终端和增强基站，The working system of the LTE-A terminal includes the LTE-A terminal and the enhanced base station,
LTE-A终端，用于在处于连接态时，不需借助于后向兼容载波的信息支持独立工作在非后向兼容载波上；还用于在处于空闲态时，只驻留在后向兼容下行组成载波上；LTE-A terminals are used to support independent operation on non-backward compatible carriers without the information of backward compatible carriers when they are in the connected state; they are also used to only reside on backward compatible carriers when they are in the idle state. On the downlink component carrier;
增强基站，在所述非后向兼容载波上提供所述LTE-A终端在此非后向兼容载波上独立工作的系统配置参数；还用于在与LTE-A终端在后向兼容下行组成载波上进行空闲态驻留操作，在与后向兼容下行组成载波对应的上行组成载波上收到随机接入前导消息后，在此后向兼容下行组成载波上发送随机接入响应；并且与LTE-A终端之间建立RRC连接过程中，在此后向兼容下行组成载波上发送无线资源控制连接建立消息。The enhanced base station provides system configuration parameters for the LTE-A terminal to work independently on the non-backward compatible carrier on the non-backward compatible carrier; it is also used to form a carrier in the backward compatible downlink with the LTE-A terminal After receiving the random access preamble message on the uplink component carrier corresponding to the backward compatible downlink component carrier, send a random access response to the compatible downlink component carrier thereafter; and LTE-A During the process of establishing the RRC connection between the terminals, a radio resource control connection establishment message is then sent to the compatible downlink component carrier.
如图1所示，增强长期演进系统终端的工作方法包括：As shown in Figure 1, the working methods of the enhanced LTE system terminal include:
(1)处于连接态LTE-A终端独立地工作在非后向兼容载波上，不需要借助于后向兼容载波的信息支持。(1) The LTE-A terminal in the connected state works independently on the non-backward compatible carrier, and does not need information support from the backward compatible carrier.
增强基站在此非后向兼容载波上提供连接态LTE-A终端能够独立工作在此非后向兼容载波上的相关配置信息，如同步/系统信息/寻呼等，使连接态LTE-A终端可独立地工作在非后向兼容载波上(即连接态LTE-A终端可以不需要借助其它后向兼容载波的配合和信息支持，便可在此非后向兼容载波上工作)。The enhanced base station provides connected state LTE-A terminals on this non-backward compatible carrier with relevant configuration information that can work independently on this non-backward compatible carrier, such as synchronization/system information/paging, so that connected state LTE-A terminals It can independently work on a non-backward compatible carrier (that is, a connected LTE-A terminal can work on this non-backward compatible carrier without the cooperation and information support of other backward compatible carriers).
实施例中，连接态LTE-A终端独立工作的非后向兼容载波是指一个或一个以上下行非后向兼容载波。In the embodiment, the non-backward compatible carrier on which the LTE-A terminal in the connected state works independently refers to one or more downlink non-backward compatible carriers.
处于连接态LTE-A终端独立地工作在非后向兼容载波上，不需要借助于后向兼容载波的信息支持，则不用监测其它组成载波，有利于终端省电。In the connected state, the LTE-A terminal independently works on the non-backward compatible carrier, and does not need information support from the backward compatible carrier, so it does not need to monitor other component carriers, which is beneficial for the terminal to save power.
(2)处于空闲态的LTE-A终端只驻留在后向兼容载波上；(2) The LTE-A terminal in the idle state only camps on the backward compatible carrier;
本发明的中处于空闲态的LTE-A终端的“驻留”涉及LTE-A终端在空闲态的所有操作，例如接收广播消息，寻呼消息等等。The "camping" of the LTE-A terminal in the idle state in the present invention involves all operations of the LTE-A terminal in the idle state, such as receiving broadcast messages, paging messages, and so on.
而且，LTE-A终端在小区选择或小区重选时在后向兼容载波上驻留，而不在非后向兼容载波上进行驻留；LTE-A终端从连接态转到空闲态时驻留到后向兼容载波上。Moreover, LTE-A terminals camp on backward compatible carriers during cell selection or cell reselection, but not on non-backward compatible carriers; LTE-A terminals camp on Backward Compatible Carrier.
系统配置或协议约定处于空闲态的LTE-A终端只驻留在后向兼容载波上后，LTE-A终端在随机接入过程中，其可接入的上行组成载波只对应于一个后向兼容的下行组成载波，增强基站在某一上行载波收到LTE-A终端发送的RACH前导，就可获知终端初始驻留的下行组成载波，于是增强基站在此后向兼容下行组成载波上发送RACH前导响应，并且在后续的无线资源控制连接过程中，增强基站也在此后向兼容下行组成载波上发送无线资源控制连接建立消息(消息4)。这样，对初始接入下行载波不明确问题，增强基站不需在与上行组成载波对应的所有下行组成载波上发送随机接入响应，节省系统下行资源；而且，不需专门的选择策略从多个下行组成载波上选择一下行组成载波用于发送随机接入响应，简化增强基站的操作。After the system configuration or agreement stipulates that the LTE-A terminal in the idle state only camps on the backward compatible carrier, the uplink component carrier that the LTE-A terminal can access only corresponds to one backward compatible carrier during the random access process. The enhanced base station receives the RACH preamble sent by the LTE-A terminal on a certain uplink carrier, and can know the downlink component carrier where the terminal initially resides, so the enhanced base station then sends a RACH preamble response to the compatible downlink component carrier , and in the subsequent radio resource control connection process, the enhanced base station also sends a radio resource control connection establishment message (message 4) to the compatible downlink component carrier thereafter. In this way, the enhanced base station does not need to send a random access response on all downlink component carriers corresponding to the uplink component carrier for the problem of unclear initial access to the downlink carrier, which saves system downlink resources; moreover, no special selection strategy is required from multiple The downlink component carrier is selected on the downlink component carrier to send the random access response, which simplifies the operation of the enhanced base station.
下面以具体实施例进一步说明本发明方法。The method of the present invention is further described below with specific examples.
如图2所示，该实施例LTE-A小区中有5个下行组成载波，3个上行组成载波，如图2所示，其中后向兼容组成载波对分别是下行组成载波2与上行组成载波1、下行组成载波3与上行组成载波2、下行组成载波5与上行组成载波3。非后向兼容组成载波对分别是下行组成载波1与下行组成载波1、下行组成载波4与上行组成载波2。其中，配置下行组成载波1与下行组成载波4的中心载波频率不在100KHz上，基站在下行组成载波1与组成载波4下发连接态终端独立工作在该类组成载波上的必需配置，如同步/系统信息/寻呼等。As shown in Figure 2, there are 5 downlink component carriers and 3 uplink component carriers in the LTE-A cell of this embodiment, as shown in Figure 2, wherein the backward compatible component carrier pairs are the downlink component carrier 2 and the uplink component carrier respectively 1. The downlink component carrier 3 and the uplink component carrier 2, the downlink component carrier 5 and the uplink component carrier 3. The non-backward compatible component carrier pairs are downlink component carrier 1 and downlink component carrier 1, downlink component carrier 4 and uplink component carrier 2 respectively. Among them, the center carrier frequencies of the configured downlink component carrier 1 and downlink component carrier 4 are not above 100KHz, and the base station issues the necessary configurations for the terminal in the connected state to work independently on this type of component carrier on the downlink component carrier 1 and component carrier 4, such as synchronization/ System information/paging etc.
对LTE-A终端，小区搜索按100KHz整数倍的频率进行搜索，若初始下行同步到下行组成载波2上，进而接收广播，通过广播消息获知其配对上行组成载波1，LTE-A终端在上行组成载波1发送RACH前导序列，eNodeB收到RACH前导序列后，获知LTE-A驻留的下行组成载波是下行组成载波2，并在下行组成载波2发送RACH响应，LTE-A终端收到RACH响应后在上行组成载波1发送消息3，eNodeB进而在下行组成载波2发送消息4。For LTE-A terminals, the cell search is carried out at a frequency that is an integer multiple of 100KHz. If the initial downlink is synchronized to the downlink component carrier 2, and then receives the broadcast, the paired uplink component carrier 1 is known through the broadcast message, and the LTE-A terminal is on the uplink component carrier 1. Carrier 1 sends the RACH preamble sequence. After receiving the RACH preamble sequence, the eNodeB knows that the downlink component carrier where LTE-A resides is the downlink component carrier 2, and sends a RACH response on the downlink component carrier 2. After the LTE-A terminal receives the RACH response The message 3 is sent on the uplink component carrier 1, and the eNodeB further sends the message 4 on the downlink component carrier 2.
连接态的LTE-A终端可以独立工作在任一下行组成载波。An LTE-A terminal in a connected state can work independently on any downlink component carrier.
当LTE-A终端从连接态转到空闲态时，eNodeB将其配置到下行后向兼容载波，如组成载波2上，该终端进而驻留在下行组成载波2。When the LTE-A terminal changes from the connected state to the idle state, the eNodeB configures it to a downlink backward compatible carrier, such as component carrier 2, and then the terminal camps on the downlink component carrier 2.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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