CN1917679A

CN1917679A - Method of selecting networks for GSM module in PHS and GSM dual mode handset

Info

Publication number: CN1917679A
Application number: CNA2005100908559A
Authority: CN
Inventors: 于志斌; 程琼; 仝庆贻
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2005-08-18
Filing date: 2005-08-18
Publication date: 2007-02-21

Abstract

The method comprises: 1) when GSM module needs to select a network, it firstly decides if there is a 900 MHz frequency range network capable of meeting the communication need; if yes, then selecting the 900 MHz frequency range network as the working network of the dual-mode mobile phone; otherwise, entering the step 2; 2) deciding if there is a 1800 frequency range network; if not, then returning the step 1 to reselect network; if yes, then selecting 1800 frequency range network as the working network of the dual-mode mobile phone.

Description

The method that gsm module is selected net in PHS and the GSM dual-mode handset

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of PHS (Personal Handyphone System, personal handyphone system) and the method that gsm module is selected net in GSM (Global System for Mobile communication, the global system for mobile communications) dual-mode handset.

Background technology

Development along with mobile communication business, increasing user has had a plurality of terminals of supporting heterogeneous networks, this has also brought the inconvenience of carrying in the communication service that brings convenience for the user and when having saved telephone expenses, and the user has a plurality of terminals simultaneously and also increased it and purchase the machine cost.So can support the bimodulus multi-frequency mobile phone of multiple network just to arise at the historic moment.The bimodulus multi-frequency mobile phone has increased the network support ability, has the network handoff functionality, has reduced difficulty and cost that the user is switched between two kinds of standard services effectively.

PHS and GSM dual-mode handset are a kind of dual-mode handsets that can support PHS and two kinds of networks of GSM simultaneously, and the PHS mobile phone charge is cheap, but signal a little less than, can not roam, the GSM mobile handset coverage is big, signal is good, but telephone expenses are higher.So PHS and GSM dual-mode handset can be fully in conjunction with the advantage of two kinds of networks, the user can make a choice neatly according to the needs of environment or practical operation, which network technology more can play a role, just allow mobile phone switch to the work of going down of which kind of pattern, if the mobile phone communication quality is high or other bad communication phenomenons occur under certain pattern, can freely forward work under another network schemer to.

The working frequency range of PHS network is 1900MHz.And GSM is a Dual Band network, and promptly GSM mobile handset has taken 900MHZ and two frequency ranges of 1800MHZ, and they all are GSM standard.Two network system function are identical, mainly are the frequency differences, and GSM900 is operated in 900MHZ, and DCS 1800 is operated in 1800MHZ.That use the earliest is GSM900, along with developing rapidly of communication network scale and number of users, original GSM900 network growing tension that becomes, for satisfying the demand that the user increases better, introduced DCS1800, and to adopt with the GSM900 network be support, the networking mode of DCS1800 network for replenishing, constitute the GSM900/DCS1800 dual-frequency network, to relax the situation that is becoming tight high traffic compact district wireless channel day.Like this, the user just can freely be switched between the two at GSM900/DCS1800, selects preferable channel to converse automatically, has improved user's call completing rate greatly, and this handoff procedure can not have influence on user's normal talking.

Because the working frequency range of GSM network has comprised 1800MHz, though therefore PHS and GSM dual-mode handset have above-mentioned advantage, but because the frequency range of DCS1800 and PCS1900 is very approaching, so can produce interference physically, when gsm module is in DCS1800, cause this PHS and GSM dual-mode handset result of use not good.

Summary of the invention

At existing problem and shortage in above-mentioned existing PHS and the use of GSM dual-mode handset, the purpose of this invention is to provide the method that gsm module is selected net in a kind of simple general-purpose, the PHS that can effectively avoid phase mutual interference between PHS and the GSM network and the GSM dual-mode handset.

The present invention is achieved in that the method that gsm module is selected net in a kind of PHS and the GSM dual-mode handset, may further comprise the steps:

When (1) gsm module need be selected net, at first judge whether to exist the 900MHz frequency range network that satisfies communicating requirement, then select the job network of this 900MHz frequency range network if exist, otherwise enter step (2) as described dual-mode handset;

(2) judge whether to exist the 1800MHz frequency range network that meets communicating requirement, then do not return step (1) and select net again if do not exist; Then select the job network of 1800MHz frequency range network if exist as this dual-mode handset.

Gsm module has been selected behind the job network of 1800MHz frequency range further comprising the steps of in the described step (2):

Start the timer in the described dual-mode handset, after arriving the time of setting, judge whether gsm module and network have information interaction, if there is not the configuration information of then preserving 1800MHz frequency range network, disconnect network linking and begin to search for and whether have a 900MHz frequency range network that satisfies communicating requirement, then switch to 900MHz frequency range network if exist, otherwise return to 1800MHz frequency range network, and restart described timer according to the information of the 1800MHz frequency range network of preserving; If gsm module and network have information interaction, then restart described timer.

The present invention is by being provided with the gsm module of PHS and GSM dual-mode handset, make this module use 900MHz frequency range network work as much as possible, promptly the preferential 900M network of selecting under the situation that 900MHz and 1800MHz network all exist is only just selected the 1800MHz network when can not find the 900MHz network.The situation that this has been avoided DCS1800 and PCS1900 to work simultaneously most possibly, thus interfering with each other between the heterogeneous networks signal reduced effectively.The present invention has improved the result of use of PHS and GSM dual-mode handset.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is the flow chart that gsm module of the present invention is selected net when being operated in the 1800MHz network segment.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

PHS and GSM dual-mode handset comprise PHS module and gsm module simultaneously.As shown in Figure 1, when start or mode switch, gsm module starts and begins to look for net, searches for available GSM network.Gsm module of the present invention at first searches for whether there is the 900MHz frequency range network that satisfies communicating requirement, be that gsm module at first searches for whether there is the 900M network, if exist the 900M network to judge then whether it satisfies normal communicating requirement, then finish to look for net, gsm module to be operated in the 900M network if satisfy communicating requirement.If gsm module does not find the 900M network, though perhaps found the 900M network, owing to network signal is more weak etc. reason causes can't proper communication, then abandon using the 900M network, begin to search for the 1800M network.Way of search is searched for the mode of 900M network as described above and is carried out.If find the 1800M network that satisfies communicating requirement, gsm module is operated in the 1800M network; Otherwise, return and begin to look for the net step and look for net again.

If gsm module selects the 1800M network as the work network segment, then start the timer in PHS and the GSM dual-mode handset simultaneously, the effect of timer is when GSM is operated in the 1800M network, the 900M network that timing search can be used.As shown in Figure 2, concrete searching method is as follows:

Whether timer is judged to have between this moment gsm module and the network and is called out and by interbehaviors such as calling, conversation, data transmit-receive, transmitting-receiving short message or network registries behind setting-up time.If have, then do not initiate to look for net, and restart timer.If do not have the information interaction behavior between gsm module and the network, then preserve the carrier frequency of 1800M network and the position area information at gsm module place, and stop gsm module on the 1800M network and the connection between the base station, begin to search for the 900M network.If find the 900M network, and the 900M network that finds satisfies normal communication needs, timeing closing device then, and gsm module switches to the 900M network work.If do not find the 900M network, though perhaps find the 900M network, but network quality can not satisfy normal communication needs, then finish to look for net and return to being connected of 1800M network with position area information, start timer simultaneously with repeat search 900M network according to the 1800M network carrier frequency of preserving.

Those skilled in the art are when understanding, and the timing length of timer of the present invention can rule of thumb be set (as 10 minutes), also can set arbitrarily as required.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1, the method that gsm module is selected net in a kind of PHS and the GSM dual-mode handset is characterized in that this method may further comprise the steps:

2, the method that gsm module is selected net in PHS according to claim 1 and the GSM dual-mode handset is characterized in that, gsm module has been selected behind the job network of 1800MHz frequency range further comprising the steps of in the described step (2):

3, the method that gsm module is selected net in PHS according to claim 2 and the GSM dual-mode handset is characterized in that, the information interaction of described gsm module and network comprises calls out and by calling, conversation, data transmit-receive, transmitting-receiving short message and network registry.

4, the method that gsm module is selected net in PHS according to claim 2 and the GSM dual-mode handset is characterized in that, the timing length of described timer can be set as required.

5, the method that gsm module is selected net in PHS according to claim 2 and the GSM dual-mode handset is characterized in that, the configuration information of described network comprises the carrier frequency information of network and the position area information at gsm module place.