CN100407855C - A method for a terminal to select a network in a CDMA system - Google Patents
A method for a terminal to select a network in a CDMA systemDownload PDFInfo
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Abstract
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Translated fromChinese技术领域technical field
本发明涉及移动通信技术领域，尤其是涉及移动通信系统中终端选择网络的技术。The present invention relates to the technical field of mobile communication, in particular to the technology for a terminal to select a network in a mobile communication system.
背景技术Background technique
移动用户在不同国家或不同运营商的移动网络之间进行漫游，对当前移动网络而言已是非常普遍的现象。随着全球人口流动性的日益加剧，不同国家或同一国家的多个移动运营商需要签订漫游协议，以使归属于自己的移动用户尽可能在全球绝大部分地区都能享用移动业务，从而提高运营商自身的竞争力。It is a very common phenomenon for current mobile networks that mobile users roam between mobile networks of different countries or different operators. With the increasing mobility of the global population, multiple mobile operators in different countries or in the same country need to sign roaming agreements, so that their own mobile users can enjoy mobile services in most parts of the world as much as possible, thereby improving Operators' own competitiveness.
近几年来，CDMA网络运营商逐渐从早期的只提供电路交换(CircuitSwitching，CS)业务的CDMA IS-95，即窄带CDMA网络陆续演进到cdmalX网络，以满足不断增长的语音和分组数据服务需求。cdmalX网络分成电路域和分组域，分别提供CS业务和分组交换(Packet Switching，PS)业务。由于cdmalX与CDMA IS-95的兼容性较好，绝大部分已经有CDMA IS-95网络的运营商都对原有网络进行升级并增加分组域设备的方式来演进到cdmalX网络，从而使只提供CS业务的网络演进成为能提供CS业务和PS业务的网络。由于网络建设的不同步，移动运营商之间签订的漫游协议也分别针对CS业务和PS业务。从而造成某一移动运营商在CDMA IS-95网络建成之后，与多个移动运营商签订CS业务漫游协议，等cdmalX网络建成之后，再与多个移动运营商签订PS业务漫游协议，和同一个移动运营商签订CS业务漫游协议的运营商与签订PS业务漫游协议的运营商很可能是不同的，因为运营商建设cdmalX分组网的时间不同步，或者有些运营商只建设分组网。In recent years, CDMA network operators have gradually evolved from the early CDMA IS-95, which only provided Circuit Switching (CS) services, that is, narrowband CDMA networks, to cdmalX networks to meet the growing demand for voice and packet data services. The cdmalX network is divided into a circuit domain and a packet domain, providing CS services and packet switching (Packet Switching, PS) services respectively. Due to the good compatibility between cdmalX and CDMA IS-95, most operators who already have CDMA IS-95 networks upgrade their original networks and add packet domain equipment to evolve to cdmalX networks, so that only CS The service network evolves into a network that can provide CS services and PS services. Due to the asynchronous network construction, roaming agreements signed between mobile operators are also aimed at CS services and PS services. As a result, a certain mobile operator signs CS service roaming agreements with multiple mobile operators after the CDMA IS-95 network is completed, and then signs PS service roaming agreements with multiple mobile operators after the cdmalX network is completed. Mobile operators who sign CS service roaming agreements are likely to be different from those who sign PS service roaming agreements, because the time when operators build cdmalX packet networks is not synchronized, or some operators only build packet networks.
当移动终端漫游到归属网络之外的地区，存在网络选择的过程，即终端选择某个网络发起接入请求，并最终接入该网络。网络选择有两种模式：自动模式和手动模式。自动模式指用户终端根据终端中保存的网络优选列表，并根据终端接收到的网络信号质量，来选择最高优先级的网络。手动模式指用户终端接入到用户主动选择的某个网络，一般用户通过终端上的特定菜单或按键来查看当前可达的网络，然后手动选择其中一个。When the mobile terminal roams to an area outside the home network, there is a network selection process, that is, the terminal selects a certain network to initiate an access request, and finally accesses the network. There are two modes for network selection: automatic mode and manual mode. The automatic mode means that the user terminal selects the network with the highest priority according to the network preference list stored in the terminal and according to the quality of the network signal received by the terminal. Manual mode means that the user terminal is connected to a network actively selected by the user. Generally, the user checks the currently reachable network through a specific menu or button on the terminal, and then manually selects one of them.
CDMA系统中，终端根据系统标识(System Identity，SID)和网络标识(Network Identity，NID)判断是否发生网络漫游。SID长度为15比特，是由国际电联管理的在CDMA移动网中唯一标识移动业务本地网的号码，NID长度为16比特是某个SID下的网络标识，由运营商自行分配，0与65535保留，0用作表示在某个SID区中不属于特定NID区的那些基站，65535用作表示移动用户可在整个SID区中进行漫游。In the CDMA system, the terminal judges whether network roaming occurs according to the System Identity (SID) and the Network Identity (NID). The length of SID is 15 bits, and it is the number that uniquely identifies the mobile service local network in the CDMA mobile network managed by ITU. The length of NID is 16 bits, which is the network identification under a certain SID, which is allocated by the operator itself, 0 and 65535 Reserved, 0 is used to indicate those base stations that do not belong to a specific NID area in a certain SID area, and 65535 is used to indicate that mobile users can roam in the entire SID area.
若终端工作在自动网络接入模式下，当终端开机、或当前所在网络变为不可达，或间隔一定时间时，终端将自动搜索网络，并选择一个合适网络进行接入。考虑到终端在漫游情况下，可能搜索到访问网络的多个网络的信号，但某些网络与该用户的归属网络没有签订漫游协议，则不允许该终端接入。如果终端事先了解哪些已签订漫游协议的网络，则可提高网络选择接入的效率。If the terminal works in the automatic network access mode, when the terminal is turned on, or the current network becomes unreachable, or after a certain period of time, the terminal will automatically search for the network and select a suitable network for access. Considering that when the terminal is roaming, it may search for signals of multiple networks that visit the network, but some networks have not signed a roaming agreement with the user's home network, so the terminal is not allowed to access. If the terminal knows in advance which networks have signed the roaming agreement, the efficiency of network selection and access can be improved.
终端中保存有归属网络的SID(和NID)，同时还保存有国际漫游优选列表，列表中存储该终端允许漫游的网络SID(和NID)，由于NID是SID下每个运营商自行分配的，国际漫游优选列表中一般不需要NID。对于机卡分离的终端，这些信息保存在智能卡中，终端在需要时读取卡中的保存信息。The terminal saves the SID (and NID) of the home network, and also saves an international roaming preference list, which stores the network SID (and NID) that the terminal allows roaming. Since the NID is allocated by each operator under the SID, The NID is generally not required in the international roaming preference list. For the terminal where the machine card is separated, the information is stored in the smart card, and the terminal reads the stored information in the card when needed.
当终端工作在自动网络接入模式下，首先判断归属网络是否可达，若归属网络可达，则接入归属网络；若归属网络不可达，则应用国际漫游优选列表，根据可达网络的确定的优先级，从高到低逐一向网络发起接入请求，直至成功接入网络。终端自动网络接入的流程如图1所示，具体步骤如下：When the terminal works in the automatic network access mode, it first judges whether the home network is reachable, if the home network is reachable, then accesses the home network; if the home network is not reachable, applies the international roaming preference list, and determines the priority, and initiate access requests to the network one by one from high to low until they successfully access the network. The process of terminal automatic network access is shown in Figure 1, and the specific steps are as follows:
(1)终端检测当前的移动网络信号，并判断网络的可达性；(1) The terminal detects the current mobile network signal and judges the reachability of the network;
(2)终端判断归属网络是否可达，若是，则接入归属网络，结束本流程；若否，继续以下步骤；(2) The terminal judges whether the home network is reachable, if so, then accesses the home network, and ends this process; if not, continues the following steps;
(3)终端先读取并应用国际漫游优选列表，对当前可达网络进行优先级排序；(3) The terminal first reads and applies the international roaming preference list, and prioritizes the currently reachable networks;
(4)终端判断是否存在可达的且尚未尝试接入的网络，若是，继续步骤5；若否，接入失败，结束本流程；(4) The terminal judges whether there is a network that is reachable and has not yet tried to access, if so, continue to step 5; if not, the access fails, and this process ends;
(5)终端向最高优先级的尚未进行接入尝试的网络发起接入请求；(5) The terminal initiates an access request to the highest priority network that has not yet attempted an access;
(6)终端判断接入是否成功，若是，结束本流程；若否，返回步骤4。(6) The terminal judges whether the access is successful, if yes, end the process; if not, return to step 4.
举例说明如何应用国际漫游优选列表进行网络优先级排序：国际漫游优选列表为：B、C、A，若终端检测到可达网络有A、B、C、D、E，则其优先级排序为：B、C、A、D、E，或B、C、A、E、D。对于不属于列表中的网络，其优先顺序可随意。终端还存在另一种处理方式，只有属于列表中的网络才允许漫游，对不允许漫游的网络终端不进行接入尝试，则上述可达网络中只有A、B、C允许漫游，其优先顺序为：B、C、A。An example to illustrate how to use the international roaming preference list for network priority sorting: the international roaming preference list is: B, C, A, if the terminal detects that there are A, B, C, D, and E in the reachable network, its priority ranking is : B, C, A, D, E, or B, C, A, E, D. For networks that are not in the list, their order of priority is optional. There is another processing method for the terminal. Roaming is allowed only for the networks that belong to the list, and no access attempt is made for the network terminal that does not allow roaming. In the above-mentioned reachable networks, only A, B, and C are allowed to roam. For: B, C, A.
由于CDMA IS-95网络只支持CS业务，目前终端中的国际漫游优选列表只针对CS业务。随着近年来支持CS业务和PS业务的cdmalX网络的出现，不可避免地，PS业务达成的漫游协议数量相比CS业务少得多。而且，PS业务漫游协议签订的顺序，不一定与国际漫游优选列表保持一致。Since the CDMA IS-95 network only supports CS services, the current international roaming preference list in the terminal is only for CS services. With the emergence of cdmalX networks supporting CS and PS services in recent years, it is inevitable that the number of roaming agreements reached by PS services is much smaller than that of CS services. Moreover, the order in which PS service roaming agreements are signed is not necessarily consistent with the international roaming preference list.
当前网络选择过程将导致漫游终端选择一个网络，该网络与归属网络只有CS业务漫游协议，没有PS业务漫游协议，而同时有其它已签订PS业务漫游协议的可达网络。这种情况下终端在尝试发起PS业务之前，用户将不知道能否获得PS业务，这时PS业务失败，但终端仍保持在当前选择的只支持CS业务的网络中。另一种情况是，目前终端中没有归属网络是否支持PS业务的信息，如果归属网络不支持PS业务，而同时存在与归属网络有PS业务漫游协议的另一个网络也可达，这时终端只能选择归属网络，只支持CS业务。The current network selection process will cause the roaming terminal to select a network that has only a CS service roaming agreement with the home network, no PS service roaming agreement, and has other reachable networks that have signed a PS service roaming agreement. In this case, before the terminal tries to initiate the PS service, the user will not know whether the PS service can be obtained. At this time, the PS service fails, but the terminal remains in the currently selected network that only supports the CS service. Another situation is that the terminal currently has no information about whether the home network supports the PS service. If the home network does not support the PS service, and another network that has a PS service roaming agreement with the home network is also reachable, the terminal only needs to The home network can be selected, and only CS services are supported.
当前网络选择技术下，用户只能通过了解与归属网络有PS业务漫游协议的漫游国家的运营商名字，利用手动网络选择模式，选择该运营商的网络。这种方式对许多用户而言过于复杂，不实用。考虑到PS业务的日益广泛应用，若移动终端的自动网络选择过程不考虑针对PS业务的网络优先级，漫游用户不能选择并接入合适的支持PS业务能力的网络，将对PS业务的开展带来很大影响。Under the current network selection technology, the user can only select the network of the operator by knowing the name of the operator in the roaming country that has a PS service roaming agreement with the home network and using the manual network selection mode. This approach is too complex for many users to be practical. Considering the increasingly widespread application of PS services, if the mobile terminal's automatic network selection process does not consider the network priority for PS services, roaming users cannot select and access a suitable network that supports PS services, which will have a negative impact on the development of PS services. come to have a big impact.
发明内容Contents of the invention
本发明的目的是提出一种CDMA系统中终端选择网络的方法，通过在终端中增加运营商定义的PS业务国际漫游优选列表，终端应用新增列表选择并接入合适的可达网络，从而使支持PS业务的终端能顺利开展PS业务。The purpose of the present invention is to propose a method for a terminal to select a network in a CDMA system. By adding an operator-defined PS service international roaming preference list to the terminal, the terminal uses the new list to select and access a suitable reachable network, so that The terminal supporting the PS service can carry out the PS service smoothly.
为此，本发明采用如下方案：For this reason, the present invention adopts following scheme:
一种CDMA系统中终端选择网络的方法，在包括电路交换业务国际漫游优选列表的终端中增加分组交换业务国际漫游优选列表，记录与所述终端归属网络有分组交换业务漫游协议的CDMA网络的优先级，所述终端根据电路交换业务国际漫游优选列表和分组交换业务国际漫游优选列表两个列表中的网络优先级顺序来选择接入网络。A method for a terminal to select a network in a CDMA system, adding a packet-switching service international roaming preference list to a terminal including a circuit-switching service international roaming preference list, and recording the priority of the CDMA network that has a packet-switching service roaming agreement with the home network of the terminal level, the terminal selects an access network according to the priority order of the networks in the circuit-switching service international roaming preference list and the packet-switching service international roaming preference list.
在所述终端中还增加其归属网络是否支持分组交换业务的信息。Information about whether its home network supports packet switching services is also added to the terminal.
所述分组交换业务国际漫游优选列表中是CDMA网络的系统标识按照网络优先级从高到低顺序排列的。The system identifiers of the CDMA networks in the international roaming preference list of the packet switching service are arranged in descending order of network priority.
所述分组交换业务国际漫游优选列表中还包括网络标识和网络频点信息。The packet switching service international roaming preference list also includes network identification and network frequency point information.
如果所述终端只支持电路交换业务，不应用分组交换业务国际漫游优选列表，所述终端只根据其电路交换业务国际漫游优选列表选择网络接入。If the terminal only supports circuit-switching services, the international roaming preference list for packet-switching services is not applied, and the terminal selects network access only according to its preference list for international roaming for circuit-switching services.
如果所述终端只支持分组交换业务，不应用电路交换业务国际漫游优选列表，所述终端只根据其分组交换业务国际漫游优选列表和归属网络信息选择网络接入。If the terminal only supports packet switching services, the international roaming preference list for circuit switching services is not used, and the terminal selects network access only according to its packet switching service international roaming preference list and home network information.
所述终端只对电路交换业务国际漫游优选列表或分组交换业务国际漫游优选列表中的网络进行接入尝试。The terminal only attempts to access the networks in the preferred list of international roaming for circuit switching services or the preferred list for international roaming of packet switching services.
所述终端对所有网络进行接入尝试，但不在电路交换业务国际漫游优选列表或分组交换业务国际漫游优选列表中的网络的优先级低于在电路交换业务国际漫游优选列表或分组交换业务国际漫游优选列表中的网络优先级。The terminal makes an access attempt to all networks, but the priority of the network that is not in the preferred list of international roaming for circuit switching services or the preferred list for international roaming of packet switching services is lower than that in the preferred list of international roaming for circuit switching services or international roaming for packet switching services Network priority in the preferred list.
本发明是针对PS业务的CDMA网络选择增强机制，通过在终端中增加运营商定义的PS业务国际漫游优选列表，并增加归属网络是否支持PS业务的信息。终端应用新增列表和信息选择并接入合适的可达网络，从而使支持PS业务的终端能顺利开展PS业务。The invention is aimed at the CDMA network selection enhancement mechanism of PS service, by adding the PS service international roaming preference list defined by the operator in the terminal, and adding the information of whether the home network supports the PS service. The terminal application adds a new list and information to select and access the appropriate reachable network, so that the terminal supporting the PS service can smoothly carry out the PS service.
附图说明Description of drawings
图1是现有技术中终端自动模式下的网络选择接入流程图；FIG. 1 is a flow chart of network selection and access in terminal automatic mode in the prior art;
图2是本发明中只支持PS业务的终端的网络选择接入流程图；Fig. 2 is a flow chart of network selection access for terminals that only support PS services in the present invention;
图3是本发明中支持CS和PS业务的终端的网络选择接入流程图。Fig. 3 is a flow chart of network selective access of a terminal supporting CS and PS services in the present invention.
具体实施方式Detailed ways
下面结合说明书附图来说明本发明的具体实施方式。The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.
在终端中增加PS业务国际漫游优选列表，该列表由运营商定义，记录与归属网络有PS业务漫游协议的CDMA网络优先级。同时，终端中增加归属网络是否支持PS业务的信息，也可以将其归属网络放在PS业务国际漫游优选列表中统一选择。支持PS业务的终端应用新增列表和信息选择合适网络进行接入，以便终端使用PS业务。Add a PS service international roaming priority list in the terminal, which is defined by the operator and records the priority of the CDMA network that has a PS service roaming agreement with the home network. At the same time, information about whether the home network supports the PS service is added to the terminal, and its home network can also be selected uniformly in the PS service international roaming preference list. The terminal application that supports the PS service adds a new list and information to select a suitable network for access, so that the terminal can use the PS service.
PS业务国际漫游优选列表，在表格形式上与原来的国际漫游优选列表完全一致，包括SID(和NID)信息，和网络频点信息。列表中SID按优先级从高到低的顺序排列。The PS service international roaming preferred list is completely consistent with the original international roaming preferred list in form, including SID (and NID) information, and network frequency point information. The SIDs in the list are arranged in descending order of priority.
终端在应用国际漫游优选列表和PS业务国际漫游优选列表时，有两种处理方式：(1)只有列表中SID对应的网络允许漫游，终端对其它网络不进行接入尝试；(2)不包括在列表中的SID对应的网络也可能允许漫游，只是优先级低于列表中的SID对应的网络，终端对其它网络也进行接入尝试。When the terminal applies the international roaming preferred list and the PS service international roaming preferred list, there are two processing methods: (1) only the network corresponding to the SID in the list is allowed to roam, and the terminal does not attempt to access other networks; (2) does not include The network corresponding to the SID in the list may also allow roaming, but the priority is lower than that of the network corresponding to the SID in the list, and the terminal also attempts to access other networks.
对于不同类型的终端，其对新增的PS业务国际漫游优选列表和归属网络信息的应用有所不同。下面分别说明：Different types of terminals apply differently to the newly added PS service international roaming preference list and home network information. The following are respectively explained:
(1)只支持CS业务的终端(1) Terminals that only support CS services
对只支持CS业务的终端，则新增的PS业务国际漫游优选列表和归属网络是否支持PS业务信息不起作用。终端仍按照原来的网络选择流程进行接入，即先判断归属网络是否可达，若可达则接入归属网络；若归属网络不可达，则应用已有的针对CS业务的国际漫游优选列表，对终端检测到的可达网络进行优先级排序，终端根据可达网络优先级逐一发起接入尝试，直至接入某个网络，或所有可达网络接入均失败。For a terminal that only supports the CS service, the newly added PS service international roaming preference list and whether the home network supports the PS service information will not work. The terminal still accesses according to the original network selection process, that is, first judges whether the home network is reachable, and if reachable, then accesses the home network; if the home network is not reachable, applies the existing international roaming preference list for CS services, Prioritize the reachable networks detected by the terminal, and the terminal initiates access attempts one by one according to the priority of the reachable networks until it connects to a certain network or fails to access all reachable networks.
(2)只支持PS业务的终端(2) Terminals that only support PS services
对只支持PS业务的终端，则已有的针对CS业务的国际漫游优选列表不起作用。终端先判断归属网络是否可达并支持PS业务，若是，则接入归属网络；若否，则应用PS业务国际漫游优选列表，对终端检测到的可达网络进行优先级排序，终端根据可达网络优先级逐一发起接入尝试，直至接入某个网络，或所有可达网络接入均失败。其流程如图2所示。For terminals that only support PS services, the existing international roaming preference list for CS services does not work. The terminal first judges whether the home network is reachable and supports PS services, and if so, accesses the home network; if not, applies the PS service international roaming preference list to prioritize the reachable networks detected by the terminal. The network priority initiates access attempts one by one until a certain network is accessed, or all reachable network accesses fail. Its process is shown in Figure 2.
(3)支持CS业务和PS业务的终端(3) Terminals supporting CS and PS services
支持CS业务和PS业务的终端的网络选择接入过程，与只支持PS业务的终端的网络选择接入过程类似，差异仅在于：后者应用PS业务国际漫游优选列表，对当前可达网络进行优先级排序；前者应用分别针对CS业务和PS业务的国际漫游优选列表和PS业务国际漫游优选列表，对当前可达网络进行优先级排序。其流程如图3所示。The network selection and access process of terminals supporting CS service and PS service is similar to that of terminals supporting only PS service, the only difference is that the latter uses the PS service international roaming preference list to select the currently reachable network. Priority sorting; the former uses the international roaming preference list for CS service and PS service and the international roaming preference list for PS service respectively, and prioritizes currently reachable networks. Its process is shown in Figure 3.
考虑到随着CDMA IS-95网络向cdmalX网络发展，除了一部分仅支持PS业务的数据终端外，绝大部分终端都将同时支持CS业务和PS业务。为利于这类终端能自动选择支持CS业务和PS业务的网络，运营商在定义针对国际漫游优选列表和PS业务国际漫游优选列表时，对于与归属网络已签订CS业务和PS业务漫游协议的访问网络，需尽可能保持两张列表中的优先顺序的一致性。对于只签订CS业务漫游协议，或只签订PS业务漫游协议的访问网络，则其优先顺序可任意。举例如下：国际漫游优选列表(针对CS业务)为：A、B、C、D；PS业务国际漫游优选列表为：E、C、D、F；若终端检测到的可达网络有：A、B、C、D、E、F、G，则其优先级排序应该为：C、D，后面的优先级可随意排列。Considering that with the development of CDMA IS-95 network to cdmalX network, except for some data terminals that only support PS service, most terminals will support CS service and PS service at the same time. In order to facilitate such terminals to automatically select a network that supports CS and PS services, when operators define the international roaming preference list and PS service international roaming preference list, for the access network that has signed a CS service and PS service roaming agreement with the home network Network, it is necessary to keep the consistency of the priorities in the two lists as much as possible. For the visited network that only signs a CS service roaming agreement or only signs a PS service roaming agreement, the order of priority can be arbitrary. An example is as follows: the international roaming preferred list (for CS service) is: A, B, C, D; the PS service international roaming preferred list is: E, C, D, F; if the reachable network detected by the terminal is: A, B, C, D, E, F, G, then their priority order should be: C, D, and the subsequent priorities can be arranged at will.
不同用户的国际漫游优选列表和PS业务国际漫游优选列表可以有所不同，对开通了CS业务和PS业务的用户，国际漫游优选列表和PS业务国际漫游优选列表才同时有效；对只开通CS业务的用户，PS业务国际漫游优选列表可以为空；对只开通CS业务的用户，国际漫游优选列表可以为空。同时，用户需要额外申请国际漫游权限，而且对不同国家的漫游可能需分别申请。这时，运营商就需要针对具体用户进行国际漫游优选列表和PS业务国际漫游优选列表的更新。The international roaming preferred list and the PS service international roaming preferred list can be different for different users. For users who have opened the CS service and PS service, the international roaming preferred list and the PS service international roaming preferred list are valid at the same time; For users with PS services, the international roaming preferred list can be empty; for users who only subscribe to CS services, the international roaming preferred list can be empty. At the same time, users need to apply for additional international roaming rights, and roaming in different countries may require separate applications. At this time, the operator needs to update the international roaming preferred list and the PS service international roaming preferred list for specific users.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉该技术的人在本发明所揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technology can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
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