HK1169544B - Multi-card multi-standby terminal and synchronization method and device thereof - Google Patents

Description

Multi-card multi-standby terminal and synchronization method and device thereof

Technical Field

The present invention relates to a mobile communication terminal, and more particularly, to a multi-card multi-standby terminal and a synchronization method and apparatus thereof.

Background

With the rapid development of communication technology, information exchange between people is more frequent, and one mobile communication terminal (such as a mobile phone, a vehicle-mounted mobile terminal, etc.) cannot meet the requirements of people, especially people who work in sales, management, etc., sometimes two or three or more terminals are needed to meet the requirements. It is inconvenient to carry such a number of terminals, and thus, a multi-card terminal appears on the market. The terminal only needs one carrier for a user, but can be provided with a plurality of terminal cards (SIM cards or UIM cards or USIM cards), and is obviously more convenient than carrying a plurality of terminals.

If a user needs to use multiple numbers at one terminal, the following scheme can be generally adopted:

1. multi-card single standby system: although two or more terminal cards can be connected simultaneously, in practice, only one card is currently available, and the switching of multiple cards is realized by a hardware circuit, generally, the selection is performed when the mobile phone is started, because of the influence of a protocol stack, the dynamic switching of multiple cards cannot be realized in a working state, and if the switching is performed, a mobile phone system is required to be restarted (mainly, a mobile phone protocol stack/upper-layer software and the like are started).

2. Multi-card multi-standby system: the limitation of the traditional multi-card single-standby system is overcome, the simultaneous standby of a plurality of terminal cards can be realized, the called parties of the plurality of terminal cards can be received simultaneously, a plurality of single-card terminals are similarly provided, and the practicability is obviously greatly improved.

An early multi-card multi-standby terminal actually has multiple sets of systems (generally two sets), each set of system includes respective radio frequency, baseband and protocol stack, and a terminal adopting the multiple sets of systems can really complete real simultaneous standby and call of multiple numbers, which can also be called a multi-card multi-standby multi-pass system. However, the cost of the multi-card terminal is increased greatly due to the adoption of a plurality of systems; and the corresponding power consumption is greatly increased; the volume of the terminal is increased, and the terminal is not convenient to use; for the rf module, because of the co-channel interference problem, one rf module is usually designed at the top of the terminal and the other is designed at the end of the terminal to minimize the interference, and the distance between two antennas must be larger than 100 mm.

The multi-card multi-standby terminal appearing in the later stage can be called a multi-card multi-standby single-pass system, and compared with the multi-card multi-standby single-pass system, only one set of communication module is used, and because the upper layer protocol stack needs to work cooperatively, the original multi-card multi-standby effect can be realized though the actual operation is complex because the original multi-card multi-standby protocol stack needs to be closely integrated.

In the current multi-card multi-standby terminal, when the terminal is started, a plurality of terminal cards independently search for a network and reside in a cell, for example, refer to a method for starting and searching for a network of a dual-card dual-standby mobile phone disclosed in chinese patent application publication No. CN100442898C, so that a plurality of terminal cards may reside in a plurality of different cells at the same time.

However, for the multi-card multi-standby single-pass system, because only one set of communication module is provided, paging reception and neighbor cell measurement for each cell can only be switched in turn in a time-sharing manner, paging reception efficiency of a plurality of terminal cards respectively residing in different cells is generally inversely proportional to the number of cards in standby at the same time, and measurement opportunities for neighbor cells are reduced along with increase of the number of cards in standby at the same time.

For power consumption, because each terminal card resides in a different cell, paging reception and neighbor cell measurement need to be performed in different cells in turn in a time-sharing manner, idle time of the terminal is much shorter than that of a single-standby terminal, and accordingly power consumption is higher.

Disclosure of Invention

The invention solves the problems that the efficiency of paging reception and neighbor cell measurement of the existing multi-card multi-standby terminal is low, and the power consumption of the terminal is higher.

In order to solve the above problem, an embodiment of the present invention provides a synchronization method for a multi-card multi-standby terminal, including:

after starting up, a first terminal card searches for a network and resides in a first cell;

and controlling a second terminal card to reside in the first cell, wherein the second terminal card is a terminal card suitable for residing in the same cell as the first terminal card.

Optionally, the first terminal card is a terminal card that searches for a network first and successfully resides in a cell when the terminal is turned on.

Optionally, the first terminal card is a pre-designated terminal card.

Optionally, the second terminal card meets one of the following conditions:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) the network number of the first cell exists in an EHPLMN list of the second terminal card;

(3) the network number of the first cell exists in an EPLMN list of the second terminal card;

(4) the network number of the first cell is the RPLMN of the second terminal card;

(5) the second terminal card fails to reside in other cells;

(6) the second terminal card registration or originating service is rejected by the cell network.

Optionally, in the process that the first terminal card searches for a network and successfully resides in the first cell, the system message of the first cell received by the first terminal card is stored;

the controlling the second terminal card to camp on the first cell includes: and the second terminal card reads the stored system message.

In order to solve the above problem, an embodiment of the present invention further provides a synchronization apparatus for a multi-card multi-standby terminal, including:

the system comprises a judging unit, a first cell and a second cell, wherein the judging unit is used for judging whether a second terminal card exists in other terminal cards after the first terminal card searches for a network when the first terminal card is started and successfully resides in a first cell, and the second terminal card is a terminal card suitable for residing in the same cell as the first terminal card;

and the control unit is used for controlling the second terminal card to stay in the first cell when the judgment result of the judgment unit is yes.

Optionally, the first terminal card is a terminal card that searches for a network first and successfully resides in a cell when the terminal is turned on.

Optionally, the first terminal card is a pre-designated terminal card.

Optionally, the second terminal card meets one of the following conditions:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) the network number of the first cell exists in an EHPLMN list of the second terminal card;

(3) the network number of the first cell exists in an EPLMN list of the second terminal card;

(4) the network number of the first cell is the RPLMN of the second terminal card;

(5) the second terminal card fails to reside in the cell;

(6) the second terminal card registration or originating service is rejected by the cell network.

Optionally, the control unit is further configured to control the second terminal card to reside in a second cell when the determination result of the determining unit is negative.

The embodiment of the invention also provides a multi-card multi-standby terminal comprising the synchronizing device.

Optionally, the multi-card multi-standby terminal includes a baseband processing chip and a radio frequency chip, and the synchronization device is embedded in the baseband processing chip.

Optionally, the multi-card multi-standby terminal is a dual-card dual-standby terminal.

Compared with the prior art, the technical scheme has the following advantages that when the terminal cards can reside in the same cell, the terminal cards are forced to reside in the same cell:

the paging message of the terminal cards residing in the same cell can be received at the same time, and the paging message is respectively notified to each terminal card, compared with the existing paging receiving method of switching each cell in turn by adopting a time-sharing mode, the paging receiving efficiency is higher, and the paging loss is also avoided; in addition, as paging reception on different cells in turn in a time-sharing manner is not needed, the idle time of the terminal is increased, and correspondingly, the power consumption is lower.

A plurality of terminal cards residing in the same cell can share neighbor cell measurement information, a physical layer uniformly measures the neighbor cells of the cell, and neighbor cell measurement results can be only reported to a first terminal card, so that the measurement efficiency is higher compared with the existing method of switching the neighbor cell measurement of each cell in turn by adopting a time-sharing mode; in addition, since the neighbor cell measurement is not required to be performed on different cells in a time-sharing and alternate manner, the idle time of the terminal is increased, and accordingly the power consumption is low.

The first terminal card stores the received cell system information after residing in the cell, and the terminal card subsequently residing in the same cell can directly read the stored system information without receiving the system information again, thereby obviously shortening the time of the terminal card residing in the cell.

Drawings

Fig. 1 is a flowchart of a synchronization method of a multi-card multi-standby terminal according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention considers the situation whether a plurality of terminal cards can reside in the same cell when the multi-card multi-standby terminal is started, namely, the cell synchronization of the plurality of terminal cards is initiated under the possible situation, the plurality of terminal cards are tried to reside in the same cell, so that the terminal cards residing in the same cell can share the cell information, such as system information, adjacent cell measurement results and the like, and can simultaneously receive the paging information of the plurality of terminal cards.

The synchronization method of the multi-card multi-standby terminal comprises the following steps: after starting up, a first terminal card searches for a network and resides in a first cell; and controlling a second terminal card to reside in the first cell, wherein the second terminal card is a terminal card suitable for residing in the same cell as the first terminal card.

The first terminal card may be a terminal card that searches for a network first and successfully resides in a cell when the terminal is turned on, that is, when the terminal is turned on, all the terminal cards respectively search for a network and reside in a cell, the terminal card that searches for a network first and successfully resides in a cell is the first terminal card, and the cell in which the terminal card resides successfully is the first cell. If the cell where the terminal card which searches the network first and successfully resides in the cell resides is not suitable for the residence of other terminal cards, the first terminal card can also be the terminal card which successfully resides in the cell subsequently.

The first terminal card may also be a pre-designated terminal card, that is, one terminal card of the plurality of terminal cards is designated to search for a network and to camp on a cell when the terminal card is turned on, and the cell where the network is successfully camped on is the first cell.

The first terminal card may also be referred to as a main card, and if there are other terminal cards and the same cell (first cell) where the other terminal cards reside, the main card receives and stores the system message of the first cell, and the other terminal cards residing in the same cell as the main card may directly read the stored system message. In addition, the neighbor cell measurement result of the first cell only needs to be reported to the main card, and other terminal cards residing in the same cell as the main card can share the neighbor cell measurement result of the first cell. In addition, if the cells of the plurality of terminal cards are successfully synchronized after the terminal card is turned on, the cell reselection of the terminal cards can be synchronized, that is, when the cell reselection occurs to the main card, other terminal cards reselect the cell in which the main card reselects and resides.

The technical scheme of the embodiment of the invention can be applied to various network standards, such as a time division synchronous code division multiple access (TD-SCDMA) network, a Wideband Code Division Multiple Access (WCDMA) network, a Code Division Multiple Access (CDMA) network, a global system for mobile communication (GSM) network, an LTE network and the like.

A terminal card (second terminal card) adapted to reside in the same cell as the first terminal card meets one of the following conditions:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) a public land mobile network identifier (PLMNID, used to identify an operator, hereinafter referred to as a network number) of a cell (a first cell) in which the first terminal card resides exists in a peer-to-peer home PLMN (EHPLMN, HPLMN refers to a PLMN to which the terminal card belongs) list of the second terminal card;

(3) the net number of the first cell exists in a peer-to-peer PLMN (EPLMN) list of the second terminal card;

(4) the network number of the first cell is a registered PLMN (RPLMN, which refers to a PLMN that the user successfully registered last time, where RPLMN may be HPLMN, EHPLMN, EPLMN, or any PLMN that allows the terminal card to roam);

(5) the second terminal card cannot normally reside in other cells (the residence in other cells fails); namely, the second terminal card fails to search the network, and cannot find the cell where the second terminal card can normally reside.

(6) The second terminal card registration or origination service is rejected by the cell network (e.g., due to a default condition or other reasons that may cause it to not normally reside), and in such a case, the first cell may only provide limited service to the second terminal card.

In a certain country or region, a cellular mobile communication network of a certain standard of a certain operator is called PLMN (public land mobile network). The PLMN is a network established and operated by the government or its approved operator for the purpose of providing land mobile services to the public. The network can be interconnected with other communication networks such as PSTN (public switched telephone network) and the like to form a communication network of the whole region or country scale. In the continental region of china, there are currently 3 PLMNs in total. Namely: GSM/GPRS/EDGE (global system for mobile communication/general packet radio service/enhanced data rates for GSM evolution) network for chinese mobile, GSM/GPRS network for chinese communication, and CDMA-1X (code division multiple access1X ) network for chinese telecommunications.

PLMNs distinguish between different operators or networks of different modes of the same operator. For example, it can be used to distinguish china mobile and china unicom, and also can distinguish TD-SCDMA (time division-synchronous code division multiple access) network and GSM network of china mobile, or WCDMA (wideband code division multiple access) or GSM network of china unicom. In fact, existing handsets display "2G" or "3G" identifiers on the handset screen, by identifying PLMNs. The 2G (second generation) refers to GSM and CDMA-1X networks, while TD-SCDMA, WCDMA and the like are 3G (third generation) networks. The TD-SCDMA and WCDMA network evolution networks are Long Term Evolution (LTE) systems.

Classified according to the PLMN relationship, the PLMN may be further classified into a HPLMN (homepublic land mobile network, or called home PLMN), an EHPLMN (equivalent home PLMN), an EPLMN (equivalent PLMN), an RPLMN (registered PLMN), and the like. This is mainly used to distinguish the relationship between the terminal card and the PLMN. For example, the PLMN of TD-SCDMA in china is the EPLMN of its GSM network, and it can be simply considered that the mobile phone residing in GSM and TD-SCDMA in china is equivalent, that is, the charging policies of charging (call, short message sending, etc.), allowed services, etc. are consistent. For the SIM or USIM card issued by China Mobile, the GSM network of China Mobile is the HPLMN, and the TD-SCDMA is the EHPLMN. The RPLMN is the last successful PLMN registered.

The following describes in detail an embodiment of the present invention with reference to the accompanying drawings by taking a dual-card dual-standby mobile phone as an example, where the dual-card dual-standby mobile phone includes a terminal card 1 and a terminal card 2.

Referring to fig. 1, the synchronization method of the dual-card dual-standby mobile phone of the present embodiment includes:

step S11, start up, and terminal card 1 searches for the network. In this embodiment, the terminal card 1 is pre-designated to search for the network when the terminal card is started, so that for a multi-card multi-standby single-pass system, because only one set of communication module is provided, the network search of 2 cards is switched in turn without adopting a time-sharing mode, and the network search process is faster.

The network searching process comprises the following steps:

(a) and measuring the received signal field intensity indicator (RSSI) of all frequency points in the frequency band supported by the mobile phone. Specifically, all frequency points in the frequency band are scanned according to the network standard supported by the mobile phone, and the RSSI of each frequency point is measured.

(b) And (c) judging whether frequency points need to be subjected to cell search, if so, performing (c), and if not, finishing the network searching process. If the RSSI of the frequency point is larger than a preset threshold value (for example-108 dbm), the frequency point needs to search a cell; otherwise, the searching fails because there is no suitable resident cell.

(c) And (d) selecting a frequency point from high to low according to the RSSI for searching the cell, if the search is successful, continuing to select a frequency point for searching the cell if the search is failed. Specifically, the frequency points which need to be subjected to cell search are sorted from high to low according to RSSI, the frequency point with the highest signal intensity is selected for cell search, and after a mobile phone receives the synchronization information (information transmitted by a synchronization channel SCH through a GSM network, information transmitted by a P-CCPCH through a primary common control physical channel through a TD-SCDMA network, and information transmitted by a common pilot channel CPICH through a WCDMA network) of a cell, the cell is considered to be searched, namely the cell search is successful, and (d) is carried out; and if the cell search of the frequency point fails, continuing to select the next frequency point with high RSSI for searching until the cell search is successful, or all the frequency points needing cell search fail to search.

(d) And (b) trying to reside the cell with successful search, finishing the network searching process if the residence is successful, and performing (b) if the residence is failed. The process of residing in the cell comprises the following steps:

(d1) all system messages for the cell are received. The mobile phone monitors a Broadcast Control Channel (BCCH) of the cell, and receives general information transmitted by the BCCH, i.e. system information.

(d2) If the reception is successful (d3), and if the reception is failed, the camping is failed. If the mobile phone receives all system messages of BCCH and stores them in the terminal card 1, then proceed (d 3); otherwise, the cell camping fails.

(d3) If the received signal strength of the cell (the received signal strength indication RSSI of the GSM network and the received signal code power RSCP of the TD-SCDMA network and the WCDMA network) meets the minimum access threshold required by the network, the location area to which the cell belongs is not forbidden, the cell is not blocked (bar), and the network number of the cell belongs to the network of the operator to which the terminal card 1 belongs (i.e., the cell can reside), the residence is successful; otherwise the park fails.

In step S12, the terminal card 1 successfully camps on the first cell, and then executes step S13. In this embodiment, the terminal card for searching the network when the terminal card is started up is designated as the terminal card 1, and after the terminal card 1 successfully resides in the cell, the terminal card 1 is designated as the first terminal card, and the cell successfully resides in the cell is the first cell. If the terminal card 1 fails to search for the network and reside in the cell, the terminal card 2 may continue to search for the network, and if the terminal card 2 successfully resides in the cell, the terminal card 2 is determined as the first terminal card, and the cell in which the terminal card successfully resides is the first cell. In other embodiments, it may also be configured to designate the terminal card 2 to perform network search first, or the terminal card 1 and the terminal card 2 perform network search and cell residence respectively, where the terminal card that succeeds in network search and cell residence first is the first terminal card, and the cell that succeeds in cell residence is the first cell.

Step S13, determining whether the terminal card 2 and the terminal card 1 belong to the same operator, if yes, performing step S21, otherwise, performing step S14. Whether the two cards belong to the same operator can be judged by reading International Mobile Subscriber Identities (IMSIs) of the terminal card 1 and the terminal card 2, and if the two cards belong to the same operator, the terminal card 2 and the terminal card 1 reside in the same cell, namely the terminal card 2 resides in a first cell; if the two cards belong to different operators, the terminal card 2 is continuously judged whether other situations which can reside in the same cell with the terminal card 1 are met.

Step S14, determining whether the network number of the first cell exists in the EHPLMN list or the EPLMN list of the terminal card 2, or whether the network number of the first cell is the RPLMN of the terminal card 2, if yes, performing step S21, otherwise, performing step S15. If the two cards belong to different operators, it is continuously determined whether there are other possible situations, and the terminal card 2 and the terminal card 1 may be made to reside in the same cell, for example, whether the network number of the first cell exists in an EHPLMN list or an EPLMN list of the terminal card 2, or whether the network number of the first cell is an RPLMN of the terminal card 2. Wherein, the network number of the first cell is obtained by reading the system message of BCCH received by the terminal card 1; the EHPLMN list of the terminal card 2 can be obtained by reading the terminal card 2, and the EPLMN list of the terminal card 2 can be read from a nonvolatile random access memory (NV, used for retaining information that needs to be used after the mobile phone is turned on next time) of the mobile phone; the RPLMN of the terminal card 2 is a network in which the terminal card 2 has successfully registered last time, and can be obtained by reading the terminal card 2. If the network number of the first cell exists in the EHPLMN list or the EPLMN list of the terminal card 2, or the network number of the first cell is the RPLMN of the terminal card 2, the terminal card 2 and the terminal card 1 are allowed to reside in the same cell, that is, the terminal card 2 is allowed to reside in the first cell; if the network number of the first cell is neither in the EHPLMN list nor in the EPLMN list of the terminal card 2, nor in the RPLMN of the terminal card 2, then it is attempted to let the terminal card 2 camp on other available cells.

In step S15, the terminal card 2 searches for a network and camps on other available cells, and then performs step S16. The terminal card 2 network searching and cell camping process may refer to step S11.

In step S16, it is determined whether the terminal card 2 successfully camps on the second cell (i.e., other available cells), if yes, step S17 is executed, otherwise, step S21 is executed. If the terminal card 2 successfully resides in other cells except the first cell, the cell where the terminal card 2 resides is determined as a second cell, and then second cell registration is performed; if the terminal card 2 fails to camp in the cell, that is, the terminal card 2 cannot camp on the network normally, only limited camping is performed, so that the terminal card 2 may also be forced to camp in the first cell, and the terminal card 2 may only initiate limited services (such as emergency calls).

In step S17, the terminal card 2 performs the second cell registration, and then performs step S18.

Step S18, determining whether the terminal card 2 successfully registers the second cell, if so, performing step S19, otherwise, performing step S21. If the terminal card 2 completes the registration of the second cell, the terminal card 2 stands by in the network of the second cell; if the terminal card 2 is rejected by the network, if the terminal card 2 is in the arrearage state, only limited residence is possible, so the terminal card 2 can be forced to reside in the first cell, and the terminal card 2 can only initiate limited service.

In step S19, the terminal card 1 performs first cell registration. After the terminal card 1 completes the registration of the first cell, the terminal card 1 and the terminal card 2 respectively reside in different cells, the terminal card 1 waits for the network of the first cell, and the terminal card 2 waits for the network of the second cell.

In step S21, the terminal card 2 camps on the first cell, and then performs step S22. If the terminal card 1 and the terminal card 2 belong to the same operator, or the network number of the first cell exists in the EHPLMN list of the terminal card 2, or the network number of the first cell exists in the EPLMN list of the terminal card 2, or the network number of the first cell is the RPLMN of the terminal card 2, or the terminal card 2 fails to reside in the second cell, or the terminal card 2 registers that the network of the second cell is rejected, then the terminal card 2 and the terminal card 1 are forced to reside in the same cell, i.e., the first cell. Since the received system message of the first cell is stored in the process that the terminal card 1 searches for the network and successfully resides in the first cell, the terminal card 2 can directly read the system message of the first cell from the terminal card 1, so that the time for the terminal card 2 to reside in the first cell is significantly shortened.

In step S22, the terminal card 1 performs first cell registration, and the terminal card 2 performs first cell registration. When the terminal card 1 and the terminal card 2 can be judged to reside in the same cell, the two cards are forced to reside in the same cell, after the terminal card 1 and the terminal card 2 finish cell registration in turn, the terminal card 1 and the terminal card 2 are in standby in a network of a first cell, a mobile phone monitors a Paging Channel (PCH), paging messages of the two cards can be received at the same time, and the two cards are respectively notified, so that the paging receiving efficiency is improved, and paging loss is avoided. And the two cards can share the neighboring cell measurement information, which improves the measurement efficiency, and when the terminal card 1 performs cell reselection, the terminal card 2 can also synchronously reselect the cell where the terminal card 1 reselects and resides, that is, after the terminal card 1 and the terminal card 2 can always stay in the same cell synchronously if it is determined that the terminal card 1 and the terminal card 2 can reside in the same cell.

It should be noted that, in the foregoing embodiment, the double-card double-standby terminal is taken as an example to be described in detail, and actually, the technical solution of the embodiment of the present invention is also applicable to a multi-card multi-standby terminal supporting more than two terminal cards, and when the terminal is started, after one terminal card (first terminal card) searches for a network and successfully resides in a cell, as long as the cell where the first terminal card resides can be suitable for one or more terminal cards (collectively referred to as a second terminal card) among other terminal cards to reside, the one or more terminal cards can be forced to reside in the cell where the first terminal card resides, and then the multiple terminal cards finish cell registration in turn.

Corresponding to the synchronization method, an embodiment of the present invention further provides a synchronization apparatus for a multi-card multi-standby terminal, including:

the system comprises a judging unit, a first cell and a second cell, wherein the judging unit is used for judging whether a second terminal card exists in other terminal cards after the first terminal card searches for a network when the first terminal card is started and successfully resides in a first cell, and the second terminal card is a terminal card suitable for residing in the same cell as the first terminal card;

and the control unit is used for controlling the second terminal card to reside in the first cell when the judgment result of the judgment unit is yes, and is also used for controlling the second terminal card to reside in the second cell when the judgment result of the judgment unit is no.

The judgment basis of judging whether the second terminal card exists by the judgment unit comprises the following steps:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) the network number of the first cell exists in an EHPLMN list of the second terminal card;

(3) the network number of the first cell exists in an EPLMN list of the second terminal card;

(4) the network number of the first cell is the RPLMN of the second terminal card;

(5) the second terminal card fails to reside in other cells;

(6) the second terminal card registration or originating service is rejected by the cell network.

The specific working processes of the determining unit and the controlling unit may refer to the description of the synchronization method, and are not described herein again.

In the process that the first terminal card searches for a network and successfully resides in a first cell, a control unit controls the first terminal card to store a system message of the first cell received by the first terminal card; and in the process that the second terminal card resides in the first cell, the control unit reads the stored system message by the second terminal card so as to accelerate the residence speed of the second terminal card.

The embodiment of the invention also provides a multi-card multi-standby terminal comprising the synchronizing device, and in practical application, the synchronizing device can be embedded into a baseband processing chip in the multi-card multi-standby terminal and is matched with a radio frequency chip to complete the synchronizing method of the embodiment of the invention.

In summary, the above technical solution has the advantages of improving the paging receiving efficiency and the neighbor cell measuring efficiency, reducing the terminal power consumption, shortening the cell residence time of the terminal card, and simplifying the physical layer implementation.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (11)

1. A synchronization method of a multi-card multi-standby terminal is characterized by comprising the following steps:

after starting up, the first terminal card searches for a network and successfully resides in a first cell;

after the first terminal card resides in the first cell, judging whether the second terminal card meets any one of the following conditions:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) the network number of the first cell exists in an EHPLMN list of the second terminal card;

(3) the network number of the first cell exists in an EPLMN list of the second terminal card;

(4) the network number of the first cell is the RPLMN of the second terminal card;

(5) the second terminal card fails to reside in other cells;

(6) the second terminal card registers or initiates the business and is refused by the network of the cell;

if yes, controlling the second terminal card to stay in the first cell;

the second terminal card and the first terminal card share neighbor cell measurement information;

when the first terminal card carries out cell reselection, the second terminal card synchronously reselects the cell reselected and resided by the first terminal card.

2. The method according to claim 1, wherein the first terminal card is a terminal card that searches for a network first and successfully camps on a cell when starting up.

3. The synchronization method of a multi-card multi-standby terminal according to claim 1, wherein the first terminal card is a pre-designated terminal card.

4. The method according to claim 1, wherein in a process of the first terminal card searching for a network and successfully residing in a first cell, the system message of the first cell received by the first terminal card is stored;

the controlling the second terminal card to camp on the first cell includes: and the second terminal card reads the stored system message.

5. A synchronization apparatus of a multi-card multi-standby terminal, comprising:

the judging unit is used for judging whether the second terminal card meets any one of the following conditions after the first terminal card searches for the network when the first terminal card is started and successfully resides in the first cell:

(1) the second terminal card and the first terminal card belong to the same operator;

(2) the network number of the first cell exists in an EHPLMN list of the second terminal card;

(3) the network number of the first cell exists in an EPLMN list of the second terminal card;

(4) the network number of the first cell is the RPLMN of the second terminal card;

(5) the second terminal card fails to reside in other cells;

(6) the second terminal card registers or initiates the business and is refused by the network of the cell;

and the control unit is used for controlling the second terminal card to reside in the first cell when the judgment result of the judgment unit is yes, the second terminal card and the first terminal card share adjacent cell measurement information, and when the first terminal card performs cell reselection, the second terminal card synchronously reselects the cell in which the first terminal card reselects and resides.

6. The apparatus for synchronizing a multi-card multi-standby terminal as claimed in claim 5, wherein the first terminal card is a terminal card that first searches for a network and successfully camps on a cell when the apparatus is turned on.

7. The synchronization apparatus of a multi-card multi-standby terminal according to claim 5, wherein the first terminal card is a pre-designated terminal card.

8. The apparatus for synchronizing a multi-card multi-standby terminal according to claim 5, wherein the control unit is further configured to control the second terminal card to camp on the second cell if the determination result of the determining unit is negative.

9. A multi-card multi-standby terminal comprising the synchronization device of any one of claims 5 to 8.

10. The multi-card multi-standby terminal according to claim 9, comprising a baseband processing chip and a radio frequency chip, wherein the synchronization device is embedded in the baseband processing chip.

11. The multi-card multi-standby terminal according to claim 10, wherein the multi-card multi-standby terminal is a dual-card dual-standby terminal.