CN100431383C - A method for improving the speed of multi-mode terminal searching public land mobile network - Google Patents

Abstract

The present invention discloses a method for improving the search speed of a multi-mode terminal for a public land mobile network, comprising: setting at least one reserved bit value in a PLMN access technology identifier to indicate a specific access technology type of a UTRAN wireless access technology; When the multi-mode terminal is searching for the PLMN, if it is determined to select the UTRAN wireless access technology, it will judge the specific access technology type according to the value of the reserved bit, and use the determined specific access technology in the specific access technology type according to the judgment result. Search for PLMN in the corresponding frequency band. The invention can shorten the average time for the terminal to search the network, improve the satisfaction of multi-mode terminal users and the paging success rate of the system.

Description

A method for improving the speed of multi-mode terminal searching public land mobile network

technical field

The invention relates to a terminal wireless network access technology, in particular to a method for increasing the speed of a multi-mode terminal searching for a public land mobile network.

Background technique

According to the provisions of the 3rd Generation Partnership Project (3GPP, The 3rd Generation Partnership Project) Technical Specification (TS) 31.102, the Universal Mobile Telecommunications System (UMTS) Universal Subscriber Identity Module (USIM, Universal Subscriber Identity Module) card of the network terminal has Several files such as: the basic file EF _PLMNwACT that stores the information list of PLMN controlled by the user and its wireless access technology in the USIM card, and the list of information related to the public land mobile network (OPLMN) controlled by the operator and its wireless access technology stored in the USIM card The basic file EF _OPLMNwACT , the basic file EF HPLMNwACT for storing the information list of HPLMN and its wireless access technology in the USIM card, and the basic file EF _HPLMNwACT for saving the list of information about the registered public land mobile network (RPLMN) and its wireless access technology in the USIM card The file EF _RPLMNACT is used to save the relevant information of the Public Land Mobile Network (PLMN, PublicLand Mobile Network). Each PLMN item in these files has two bytes of access technology identifiers to represent the What kind of access technology is used by the PLMN. When the terminal of the network is powered on or in the process of searching for a PLMN with a periodic Home Public Land Mobile Network (HPLMN) or a higher priority, according to the access technology identifier corresponding to the PLMN in the corresponding file, determine the PLMN that should be selected when searching for the PLMN. access technology.

As shown in Figure 1, for PLMNs supporting the third generation (3G, The 3rd Generation) wireless access technology, all versions of the existing 3GPP TS 31.102 specifications (including the V6.8.0 version in December 2004) use the access Bit 8 of the first byte in the technical identifier, for the convenience of description, this bit is called BIT _UTRAN in this paper, and the value of BIT _UTRAN is 1 to indicate that the PLMN supports Universal Terrestrial Radio Access Network (UTRAN, Universal Terrestrial Radio Access Network) wireless access technology, bits 1 to 7 of the first byte, and bits 1 to 6 of the second byte are reserved bits RFU.

However, in the 3GPP specification, there are regulations: Frequency Division Duplex (FDD, Frequency Division Duplex), that is, Wide-band Code Division Multiple Access (WCDMA, Wide-band Code Division Multiple Access); 1.28Mcps Time-Division Duplex (TDD, Time Division Duplex), Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronized Code Division Multiple Access); and 3.84Mcps TDD three UTRAN access technologies. Among them, WCDMA access technology and TD-SCDMA access technology are commonly used at present. The TD-SCDMA/WCDMA multi-mode terminal designed according to the existing specifications, because the USIM card file only indicates that the PLMN adopts UTRAN access technology, during the power-on process or during the periodical HPLMN or higher priority PLMN search process, when When the search wireless access technology is identified as UTRAN, it is impossible to clearly determine whether to use WCDMA access technology or TD-SCDMA access technology to search for the PLMN, so only WCDMA access technology and TD-SCDMA access technology can be used to search for frequency division Duplex (FDD) and time-division duplex (TDD) frequency bands to search for the PLMN, the average time for multi-mode terminals to search for PLMNs will be extended a lot, and the average time for multi-mode terminals from powering on to obtaining services will be extended, thereby reducing user Satisfaction with its performance may lead to the extension of the periodical HPLMN or higher priority PLMN search time of this multi-mode terminal in the roaming state. During the PLMN search process, the terminal cannot listen to the paging message, so that the paging of the system Reduced call success rate.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for increasing the speed of multi-mode terminal searching for PLMN, shorten the average time of multi-mode terminal searching for PLMN, thereby improving the performance of multi-mode terminal and the paging success rate of the system.

A kind of method that improves multimode terminal search 3G PLMN speed that the present invention proposes based on above-mentioned purpose, comprises:

Use the value of at least one reserved bit in the PLMN access technology identifier to indicate the specific access technology type of the UTRAN radio access technology;

When the multi-mode terminal is searching for the PLMN, if it is determined to select the UTRAN wireless access technology, it will judge the specific access technology type according to the value of the reserved bit, and use the determined specific access technology in the specific access technology type according to the judgment result. Search for PLMN in the corresponding frequency band.

The specific access technology type described in the method includes: at least two of TD-SCDMA access technology, WCDMA access technology and 3.84Mcps TDD.

There are two types of specific access technologies described in the method;

Select two different values of a reserved bit in the PLMN access technology identifier to represent the first type of access technology and the second type of access technology;

The judgment process includes: judging whether the value of the reserved bit in the PLMN access technology identifier corresponds to the first type of access technology or the second type of access technology, and if it corresponds to the first type of access technology, select the first type The access technology searches for the PLMN in the corresponding frequency band of the first type of access technology; if it corresponds to the second type of access technology, the second type of access technology is selected to search for the PLMN in the corresponding frequency band of the second type of access technology.

There are three types of specific access technologies described in the method;

Three different values of the two reserved bits in the PLMN access technology identifier are selected to represent the first type of access technology, the second type of access technology and the third type of access technology;

The judging process includes: judging which type of access technology the value of the reserved bit in the PLMN access technology identifier corresponds to, and if it corresponds to the first type of access technology, select the first type of access technology in the PLMN access technology identifier. Search for PLMN in the frequency band corresponding to the first type of access technology; if it corresponds to the second type of access technology, select the second type of access technology to search for PLMN in the corresponding frequency band of the second type of access technology; if it corresponds to the third type of access technology , then select the third type of access technology to search for the PLMN in the frequency band corresponding to the third type of access technology.

The method further includes: when the multi-mode terminal is powered off, updating the bit value in the corresponding PLMN access technology identifier according to the access technology adopted by the current PLMN.

The method further includes: when the multi-mode terminal searches for the PLMN, if it is determined to select a non-UTRAN radio access technology, then use other access technologies other than the UTRAN radio access technology to search for the PLMN.

From the above, it can be seen that a method for improving the speed of multi-mode terminal search PLMN provided by the present invention has the following characteristics and advantages:

(1) Use the reserved bits in the PLMN access technology identifier to set the identifier representing the specific access technology type of the UTRAN wireless access technology; when the multi-mode terminal searches for the PLMN, determine the specific access technology according to the reserved bits Type, during the power-on process of a multi-mode terminal or during the periodical HPLMN search process or the higher priority PLMN search process, if the PLMN to be searched uses UTRAN access technology, the terminal can immediately and clearly know the PLMN to be searched for. It is WCDMA or TD-SCDMA access technology, so that the terminal can find the PLMN only by searching the corresponding frequency band of the access technology. Compared with the original technical solution, the average time for the terminal to search for the network is shortened, making it comparable to that of a single-mode terminal. The average time for searching the network is equivalent, which improves the satisfaction of multi-mode terminal users and the paging success rate of the system.

(2) The present invention guarantees that existing single-mode or multi-mode terminals that include TD-SCDMA or WCDMA wireless access technology are all It can be compatible with the USIM card designed according to the invention, thereby maximally protecting the investment and benefit of the mobile user on the terminal.

(3) In the preferred embodiment of the present invention, one bit is used instead of two bits to distinguish TD-SCDMA and WCDMA access technology, avoiding the occurrence of TD-SCDMA in the PLMN single list item in EF _PLMNwAcT , EF _OPLMNwACT and EF _HPLMNwAcT files WCDMA and WCDMA are two possible access technologies, thereby avoiding the confusion caused by the terminal deciding the priority of the access technology when these two access technologies appear in a single list item, so that the operator can base on the actual situation of network construction , to control which access technology the terminal uses preferentially, so that users can obtain better services.

Description of drawings

FIG. 1 is a schematic diagram of a structure of a wireless access technology identifier in the prior art;

FIG. 2 is a schematic diagram of the structure of a radio access technology identifier in a preferred embodiment of the present invention;

Fig. 3 is a schematic flow chart of a preferred embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The solution of the present invention is to keep the definition of BIT _UTRAN of the access technology identifiers of EF _PLMNwACT , EF _OPLMNwACT , EF _HPLMNwACT and EF _RPLMNACT files in the 3GPP TS 31.102 specification unchanged, still defined as UTRAN access technology, and then from the access One or more bits are selected from the reserved bits of the technology identifier RFU. For the convenience of description, this bit is called BIT _TD/W in this paper, and TD-SCDMA in UTRAN access technology is identified according to different values of BIT _TD/W Or WCDMA access technology; when the multi-mode terminal is searching for PLMN, if it is determined to select UTRAN wireless access technology, then judge the specific access technology type according to the value of the reserved bit, and use the determined specific access technology according to the judgment result The technology searches for a PLMN in the frequency band corresponding to that specific access technology.

Referring to Fig. 2, the preferred embodiment of the present invention takes the first character of the PLMN access technology identifier in the access technology identifiers of the multimode terminal USIM card files EF _PLMNwACT , EF _OPLMNwACT , EF _HPLMNwACT and EF _RPLMNACT Bit 7 of the section is used as BIT _TD/W , and the value of BIT _TD/W is 0 to indicate the TD-SCDMA access technology, and 1 to indicate the WCDMA access technology.

Referring to Figure 3, when the multimode terminal is powered on for PLMN search or periodic HPLMN or higher priority PLMN search, first execute step 301 to check and determine whether the value of BIT _UTRAN in the PLMN access technology identifier is 1. If yes, it means that the 3G PLMN uses the UTRAN access technology, and further execute step 303; otherwise, it means that the 3G PLMN does not use the UTRAN access technology, enter step 302, and use other corresponding access technologies to search for the PLMN .

Steps 303-305, check and judge whether the value of BIT _TD/W in the PLMN access technology identifier is 0, if yes, it means that the TD-SCDMA access technology in UTRAN is used, and use this access technology to search for TD -SCDMA frequency band to find the PLMN; otherwise, if the value of BIT _TD/W is 1, it means that the WCDMA access technology in UTRAN is used, and the access technology is used to search the WCDMA frequency band to find the PLMN.

When the terminal is turned off, the BIT _UTRAN and BIT _TD/W of the access technology identifier in the EF _RPLMNACT file are also updated according to the access technology (TD-SCDMA or WCDMA) adopted by the current PLMN. In this embodiment, if the PLMN adopts WCDMA access technology, the terminal will set the BIT _UTRAN and BIT _TD/W of the access technology identifier in the EF _RPLMNACT file to 1 and 1 respectively when the terminal is powered off; if the PLMN adopts TD-SCDMA access technology, the terminal will set The BIT _UTRAN and BIT _TD/W of the access technology identifier in the EF _RPLMNACT file are set to 1 and 0, respectively.

In this solution, when the USIM card manufacturer and the terminal write or update the EF _PLMNwAcT , EF _OPLMNwACT , EF _HPLMNwAcT and EF _RPLMNACT files in the USIM card, if a PLMN adopts TD-SCDMA or WCDMA access technology, the PLMN should be updated The BIT _UTRAN and BIT _TD/W bits in the access technology identifier make the access technology identifier in the file meet the requirements of this scheme.

The above is only a preferred embodiment of the present invention, and other multiple implementations can also be adopted within the spirit and principles of the present invention, such as: the first or second byte of the PLMN access technology identifier can also be defined The value of other reserved bits in the UTRAN access technology to identify the specific access technology type (TD-SCDMA or WCDMA); or a combination of multiple reserved bits can be used to identify the specific access technology type in the UTRAN access technology ; In addition, the judging process in the above steps 301 and 303 can also be modified to judge the value of the highest two bits (BIT _UTRAN and BIT _TD/W ) of the first byte of the PLMN access technology identifier at the same time, if the highest two bits If the bit value is 10, it can be determined that the specific access technology type in the UTRAN access technology is TD-SCDMA; if the value of the highest two bits is 11, it can be determined that the specific access technology type in the UTRAN access technology is WCDMA.

Take TD-SCDMA and WCDMA access technology as example in the above-mentioned example, the present invention also can include 3.84Mcps TDD etc. at present or the similar access technology that occurs in the future, if two kinds of UTRAN access wherein support in the whole mobile communication system If there are no access technologies, the solutions in the above embodiments can be directly adopted. If three or more of the UTRAN access technologies are supported in the entire mobile communication system, two or two of the PLMN access technology identifiers can be defined The above reserved bits are used to distinguish these different UTRAN access technologies.

In a word, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. A method for improving the speed of a multimode terminal searching for a public land mobile network PLMN, characterized in that it comprises: Use the value of at least one reserved bit in the PLMN access technology identifier to indicate the specific access technology type of the universal terrestrial radio access network UTRAN radio access technology; When the multi-mode terminal is searching for the PLMN, if it is determined to select the UTRAN wireless access technology, it will judge the specific access technology type according to the value of the reserved bit, and use the determined specific access technology in the specific access technology type according to the judgment result. Search for PLMN in the corresponding frequency band. 2. The method according to claim 1, wherein the specific access technology types include: time division synchronous code division multiple access technology, wideband code division multiple access technology and 3.84Mcps time division duplex access technology into at least two of the technologies. 3. The method according to claim 1 or 2, wherein the specific access technology types are two types; Select two different values of a reserved bit in the PLMN access technology identifier to represent the first type of access technology and the second type of access technology; The judgment process includes: judging whether the value of the reserved bit in the PLMN access technology identifier corresponds to the first type of access technology or the second type of access technology, and if it corresponds to the first type of access technology, select the first type The access technology searches for the PLMN in the corresponding frequency band of the first type of access technology; if it corresponds to the second type of access technology, the second type of access technology is selected to search for the PLMN in the corresponding frequency band of the second type of access technology. 4. The method according to claim 1 or 2, wherein the specific access technology types are three types; Three different values of the two reserved bits in the PLMN access technology identifier are selected to represent the first type of access technology, the second type of access technology and the third type of access technology; The judging process includes: judging which type of access technology the value of the reserved bit in the PLMN access technology identifier corresponds to, and if it corresponds to the first type of access technology, select the first type of access technology in the PLMN access technology identifier. Search for PLMN in the frequency band corresponding to the first type of access technology; if it corresponds to the second type of access technology, select the second type of access technology to search for PLMN in the corresponding frequency band of the second type of access technology; if it corresponds to the third type of access technology , then select the third type of access technology to search for the PLMN in the frequency band corresponding to the third type of access technology. 5. The method according to claim 1 or 2, further comprising: when the multi-mode terminal is powered off, updating the bit value in the corresponding PLMN access technology identifier according to the access technology adopted by the current PLMN . 6. The method according to claim 1 or 2, further comprising: when the multi-mode terminal searches for the PLMN, if it is determined to select a non-UTRAN radio access technology, then use other access technologies other than UTRAN radio access technology Enter the technical search for PLMN.

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