CN101345981B - Network selection method, communication system and mobile terminal - Google Patents

Network selection method, communication system and mobile terminal Download PDF

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Publication number
CN101345981B
CN101345981B CN2007100760067A CN200710076006A CN101345981B CN 101345981 B CN101345981 B CN 101345981B CN 2007100760067 A CN2007100760067 A CN 2007100760067A CN 200710076006 A CN200710076006 A CN 200710076006A CN 101345981 B CN101345981 B CN 101345981B
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network
signal quality
scan
information
list
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CN101345981A (en
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郭均祥
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2008/071598 priority patent/WO2009009993A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Abstract

The invention embodiment provides a network selection method which comprises: acquiring the information of peripheral networks including that with different access techniques; generating a network list according to the peripheral network information; scanning the networks in the list to obtaining the signal quality information; and selecting a network in the network list to attach according to the network list and the signal quality information of the scanned network. The invention embodiment further provides a mobile terminal and a communication system. The technical scheme in the invention enables the mobile terminal to select a proper network to attach among the networks with different access techniques.

Description

A kind of network selecting method, communication system and portable terminal
Technical field
The embodiment of the invention relates to the communications field, relates in particular at the network of multiple access technology type and deposits the technology of carrying out network selecting under the situation.
Background technology
Under existing wireless communication technology condition; The mobile subscriber can't roam under different wireless access technologys and switch; In order to solve the roaming switching problem of mobile subscriber between the system of different access technologies type; 2003 the end of the year IEEE (Institute of Electrical and ElectronicsEngineers; Institute of Electrical and Electronics Engineers) wireless working group has set up IEEE802 switching seminar, and definite designation at present is an IEEE802.21 working group, is responsible for working out public switching framework; This framework is used for wired and wireless IEEE802 standard (like IEEE802.3, IEEE802.11 and IEEE802.16) and 3G standard, is defined in the requirement and the corresponding handover mechanism that switch between the different access technologies.
Along with the evolution of wireless communication technology, terminal and network possibly be multimodes all like base station, access point, that is to say to support different wireless standards, can on a plurality of interfaces, carry out speech and transfer of data simultaneously sometimes.Present mobile communications network has developed to microcellulor (like IEEE802.11 and IEEE802.15) and macrocellular (like third generation partnership cooperative programme 3GPP, 3GPP2 and IEEE802.16); Meeting produces to intersect each other and covers between these honeycombs, and switching and network selecting will take place between networks of different type.
The irrelevant handoff solution of medium specified has disposed some handoff functionality collection among the IEEE802.21D06-00 in the mobility management protocol stack of network element; Thereby formed a new protocol layer; Be referred to as MIH (Media Independent Handover; The switching of media-independent) protocol layer abbreviates the MIH layer as.The MIH layer provides following service:
1.MIH Event Service (MIH-ES): event classification, event filtering and event report about the dynamic change incident of link characteristics, Link State and link-quality are provided.
2.MIH command service (MIH-CS): provide MIH user management and control the link behavior relevant with switching and mobility.
3.MIH information service (MIH-IS): characteristic and professional details that service network and ambient network are provided.These information are used for the efficient system access and switch decision.
The main purpose of MIH layer formulation at present is the handoff functionality that is used for media-independent; The MIH layer passes through Event Service; Command service and information service provide the handoff functionality with media-independent, and this independence is to provide unified interface to realize through the lower-layer protocols in the mobility management protocol stack to upper-layer protocol.The information service mechanism of MIH provides knows the means of neighbor networks details on every side; The MIH information service can let the terminal know the detailed features of its ambient network, like network type, and Virtual network operator; Network provider; The high-level business that network can provide, the QoS of access network (Quality of Service, service quality) characteristic, cost, data rate, safety or geographical position etc.That is to say that the information service mechanism of MIH provides and supplied the user to select the more policy information of network.
Present network selecting technology is the mechanism that inserts medium definition oneself by each, and the principle of network selecting is fairly simple usually, can not adapt to requirement under the network coexisted environment of multiple radio access technology types, how to select access network better.
For example, in existing 3GPP technology, the network selecting of UE (User Equipment, subscriber equipment) before networking is to carry out according to following principle and order:
(1) local public land mobile net network (Home Public Land Mobile Network, HPLMN) operator and user tabulate through the assembled arrangement of public land mobile net network PLMNs and wireless access technology RAT (Radio Access Technologies) and distinguish the priority of network;
(2) UE start back seeks and selects the PLMN (RPLMN) of the last registration earlier;
(3) if this RPLMN does not exist, then seek and select the highest equivalence of HPLMN or priority local public land mobile net network (Equivalent Home Public Land MobileNetwork, EHPLMN);
(4) if HPLMN or EHPLMN do not exist, user's control of then selecting successively to preserve in SIM (SubscriberIdentity Module, the Subscriber Identity Module) card according to the PLMNs of prioritization and the network in the RAT Assembly Listing;
(5) if not the existing of above-mentioned user control according to the PLMNs of prioritization and the network in the RAT Assembly Listing, the operator of then selecting successively to preserve in the SIM control according to the PLMNs of prioritization and the network in the RAT Assembly Listing;
(6) if not the existing of above-mentioned operator control, the then best network of selection signal quality from other PLMNs and RAT Assembly Listing according to the PLMNs of prioritization and the network in the RAT Assembly Listing.
UE if UE is in roaming state, then can also reselect and be registered to the network in higher PLMNs of priority level and the RAT Assembly Listing after selecting network and registration.
In existing 3G technology, when signal quality changes and do not satisfy requiring of communicating by letter, generally to carry out network reselection, the principle of network reselection is the same with order.
Above-mentioned existing technology is provided with fairly simplely to the rule of network selecting and network reselection; The priority of PLMN and RAT Assembly Listing just is set in user's SIM simply; The user selects network according to the height of priority and the quality of signal quality respectively then, and the network of selecting only is confined in the network in 3GPP camps such as GSM, GPRS, 3G.Appearance along with multiple wireless technology; Like WiMAX (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave inserts), WiFi (Wireless Fidelity; Wireless Fidelity) appearance of access technology such as; And the appearance of optimizing the IEEE802.21 technology of network selecting mechanism, above-mentioned prior art does not consider how the user carries out network selecting or network reselection between these networks under the network coexisted situation of multiple wireless technology type.The network that present IEEE802.21 technology has only defined in handoff procedure finds and the process of dynamic negotiation network that also not having solution multimode terminal when initial network entry is problem how to select the different access technologies type network.
In the existing WiMAX NWG_R1.0.0-Stage-2 standard; Under the border, field of MS (Mobile Station, travelling carriage) initial network entry (being not have storage networking to insert the information of NAP of provider and Internet Service Provider NSP among the MS) to carry out the method for network selecting following:
(1) MS detects one or more available WiMAX NAP;
(2) MS finds the available NSP be associated with one or more WiMAX NAP;
(3) MS discerns all NSP that can insert in available NSP, and selects NAP and NSP based on some prioritization criterias;
(4) MS carries out the process that inserts NAP;
(5) MS is authorized to carry out service log-on, establishes business relationship with NSP then;
(6) MS obtains and preserves configuration information.
In existing WiMAX technology, suffered at MS under the situation of storage NAP and NSP information, the method that MS carries out network selecting is following:
(1) MS uses the configuration information of preserving to detect one or more available WiMAX NAP;
(2) MS finds the available NSP be associated with one or more WiMAX NAP;
(3) all NSP that can insert of MS identification use the configuration information of preservation and select NAP and NSP based on some prioritization criterias;
(4) MS carries out the process that inserts NAP, sets up the relation of access service with NSP.
Above-mentioned existing WiMAX technology is when carrying out network selecting or network reselection; The principle of institute's foundation is fairly simple; Generally be to select network, and the network of selecting also only is confined to the WiMAX network, do not consider the network coexisted situation of multiple radio access technology types according to detected some prioritization criterias of NAP signal combination of user; During like 3GPP and WiMAX technology co-existence, how the user selects an optimum network.
Summary of the invention
The embodiment of the invention provides a kind of network selecting method, portable terminal and communication system, makes portable terminal under the network of multiple access technology type and the situation of depositing, carry out network selecting or gravity treatment.
For reaching goal of the invention of the present invention, the embodiment of the invention provides a kind of network selecting method, and this method comprises: obtain the information of ambient network, said ambient network is the network of different access technologies type; Information according to said ambient network generates network list; Scan the network in the said network list, obtain by the signal quality information of scan for networks; According to said network list and said, in said network list, select network to adhere to by the signal quality information of scan for networks.
The embodiment of the invention also provides a kind of portable terminal, and this terminal comprises: network information acquiring unit, be used to obtain the information of ambient network, and said ambient network is the network of different access technologies type; The network list generation unit is used for generating network list according to the information of said ambient network; Scanning element is used for scanning the network of said network list, obtains by the signal quality information of scan for networks; With the network selecting unit, be used for selecting the network in the said network list to adhere to according to said network list and said by the signal quality information of scan for networks.
The embodiment of the invention also provides a kind of communication system; This system comprises: portable terminal is used to obtain the information of ambient network, and generates network list according to the information of said ambient network; Scan the network in the said network list; Acquisition according to said network list and said by the signal quality information of scan for networks, is selected network to adhere to by the signal quality information of scan for networks in said network list; With the media-independent server, be used to store and provide the information of said ambient network; Said ambient network is the network of different access technologies type.
The technique scheme that the embodiment of the invention provides; Through obtaining the information of ambient network; And generate network list according to the information of ambient network; Network in the scan for networks tabulation then, the network signal quality information and the network list that obtain according to scanning are at last carried out network selecting, can realize that portable terminal selects suitable network to adhere between the network of multiple access technology type.
Description of drawings
Fig. 1 is the method simplified flow chart of the embodiment of the invention one;
Fig. 2 is the method simplified flow chart of first kind of definite attach to network providing of the embodiment of the invention one;
Fig. 3 is the method simplified flow chart of second kind of definite attach to network providing of the embodiment of the invention one;
Fig. 4 is the method simplified flow chart of definite attach to network of providing of the embodiment of the invention two;
Fig. 5 is the method simplified flow chart of the embodiment of the invention two;
Fig. 6 a is the structural representation of the portable terminal that provides of the embodiment of the invention three;
Fig. 6 b is the structural representation of network list generation unit in the portable terminal that provides of the embodiment of the invention three;
Fig. 6 c-6e is three kinds of structural representations of network selecting unit in the portable terminal that provides of the embodiment of the invention three.
Embodiment
In order further to illustrate the technical scheme of the embodiment of the invention, will combine accompanying drawing that the technical scheme that the embodiment of the invention provides is elaborated below.
Embodiment one
Present embodiment carries out network selecting with mobile node MN (Mobile Node) between the communication network of two kinds of different access technologies (like WiMAX and 3GPP) be example, specifies the network selecting method that the embodiment of the invention provides.
As shown in Figure 1, the concrete steps of present embodiment are following:
Step 101; The MIH User of MN (Media Independent Handover User; The switching user of media-independent) unit sends MIH information acquisition request message; For example MIH_Get_Information Request gives MIHF (Media Independent HandoverFunction, the handoff functionality of media-independent) unit.
Step 102; The MIHF unit is to MIIS (Media Independent Information Server; The information server of media-independent) sends above-mentioned MIH_Get_Information Request message, and carry the indication of obtaining MN ambient network information in this message.
Step 103; MIIS is according to the information indication of carrying in the above-mentioned MIH_Get_Information Request message; Extract the information of the needed ambient network of MN (ambient network is 3GPP network and WiMAX network in the present embodiment); And the information of extracting be encapsulated in MIH information obtain response message, MIH_Get_Information Response for example, in send to the MIHF unit of MN.The information of above-mentioned ambient network comprises: the data rate that network provides, Qos ability, security mechanism, operating cost or professional ability; Wherein professional ability comprises: IMS (Internet Protocol MultimediaSubsystem; IP Multimedia System), CAMEL (Customized Applications for Mobilenetwork Enhanced Logic, the customization of mobile network's enhancing logical is used), FAX (fax) or urgent call.
Step 104, the above-mentioned MIH_Get_Information Response of MIHF unit forwards message is given MIH User unit.
Step 105, MIH User unit generates the network list according to prioritization according to policy information that presets (comprising the policy information of MN self setting or the policy information of operator) and ambient network (3GPP network and the WiMAX network) information of obtaining.The priority of 3GPP network is higher than the priority of WiMAX network in the present embodiment, certainly, according to the actual conditions of heterogeneous networks with preset strategy, the order of priority is different.
Step 106, MIH User unit sends MIH scan request message to the MIHF unit, and for example MIH_Scan Request orders 3GPP network and WiMAX network in its scan for networks tabulation.
Step 107a and step 107b, the MIHF unit sends link layer scan request message respectively, and MIH_Scan Request for example carries out network sweep to 3GPP network and WiMAX network of network access point PoA-C1 and PoA-C2.
Step 108; Behind intact 3GPP network of MIHF unit scan and the WiMAX network, send the MIH scanning response message, for example the MIH_Scan Response that carry scanning result; Give MIH User unit, comprise the signal quality information of 3GPP network and WiMAX network in this scanning result.
Step 109; The signal quality information of each network is known in MIH User unit according to the scanning response message; Identify the network that signal quality meets the demands, and, in the satisfactory network of signal quality, select network to adhere to according to priority according to the policy information that presets.For example the signal quality of 3GPP network in the present embodiment and WiMAX network all meets the demands, and MN will be chosen in the high 3GPP network of network list medium priority and adhere to so.In like manner; If three kinds of networks according to following prioritization are arranged in the network list: 3GPP network, WiMAX network and WiFi network; And the signal quality that MN identifies WiMAX network and WiFi network meets the demands, and MN will select the high WiMAX network of priority to adhere between WiMAX network and WiFi network so.
Step 110, MIH User unit sends Attach Request message, for example Attach Request to 3GPP network of network access point PoA-C1.
Step 111a-step 111b, MN proceed to authentication and the registration of the 3GPP webserver (authority checking accounting server AAA/ home subscriber server HSS).
Step 112, if the authentication among the step 111a-111b with succeed in registration, the PoA-C1 of 3GPP network returns attachment response message to the MIH of MN User unit, Attach Response for example, MN adheres to the 3GPP network.
As shown in Figure 2, the foregoing description confirms that the process of attach to network is: the priority of each network of confirming earlier to scan, scan the signal quality that each network is known each network then, and select network to adhere at last, idiographic flow is following:
Step 201, MN obtains the information of ambient network from MIIS (Media Independent Information Server, the information server of media-independent).
Step 202, MN generates the network list of according to priority arranging according to policy information that presets and the ambient network information of obtaining.
Each network in the step 203, MN scan for networks tabulation is known the signal quality information of all-network in the network list.
Step 204, in the network that signal quality meets the demands, MN selects network to adhere to according to the priority of network list.
As shown in Figure 3, present embodiment also provides the process of second kind of definite attach to network, and each network in the promptly first scan for networks tabulation carries out prioritization with the network that signal quality meets the demands then, selects network to adhere at last, and idiographic flow is following:
Step 301, MN obtains the information of ambient network (WiMAX network and 3GPP network) from MIIS.
Step 302, MN generates network list according to policy information that presets and the ambient network information of obtaining.
Each network in the step 303, MN scan for networks tabulation is known the signal quality information of all-network in the network list.
Step 304; Signal quality information according to the all-network of knowing; Identify the network that signal quality meets the demands, and the network that signal quality meets the demands is carried out prioritization according to presetting the strategy and the network information, select network to adhere to according to priority.
According to the process of above-mentioned second kind of definite attach to network, can step 105 be replaced with:
Step 1051:MIH User unit generates network list according to policy information that presets (policy information of MN self setting or the policy information of operator) and ambient network (3GPP network and the WiMAX network) information of obtaining.
Step 109 is replaced with:
Step 1091; The signal quality information of each network is known in MIH User unit according to the scanning response message; Identify the network that signal quality meets the demands; And just the information of the network based policy information that presets that meets the demands of signal quality and each network is carried out prioritization, selects the highest network of priority to adhere to.For example MIH User knows the unit that the signal quality of 3GPP network and WiMAX network all meets the requirements in the present embodiment, these two networks is carried out confirming that the priority of 3GPP network is the highest after the prioritization MN will select the 3GPP network to adhere to so.
Through the network selecting method that present embodiment provides, can realize that portable terminal selects suitable network to adhere between the network of multiple access technology type.
Embodiment two
Present embodiment still carries out network selecting with MN between the communication network of two kinds of different access technologies (like WiMAX and 3GPP) be example, specifies the network selecting method that the embodiment of the invention provides.The technical scheme distinctive points that provides among technical scheme that present embodiment provides and the embodiment one is that MN after obtaining the network list that sorts by priority, scans and network selecting according to priority orders.As shown in Figure 4, the method flow of present embodiment is following:
Step 401, MN obtains the information of ambient network from MIIS.
Step 402, MN generates the network list of according to priority arranging according to policy information that presets and the ambient network information of obtaining.
Step 403, the highest network of MN scan for networks tabulation medium priority is known the signal quality information of this network.
Step 404, the signal quality of the network the highest as if this priority meets the demands, and then execution in step 406; If the signal quality of the network that this priority is the highest does not meet the demands, then execution in step 405.
Step 405 scans the network of next priority and execution in step 404.
Step 406, MN carries out network attachment.
As shown in Figure 5, the concrete performing step of present embodiment is following:
Step 501-step 505, identical with step 101-step 105, repeat no more here.
Step 506, MIH User sends MIH_Scan Request message to MIHF, orders the highest 3GPP network of its scan for networks tabulation medium priority.
Step 507, MIHF sends link layer MIH_Scan Request message and scans to the 3GPP network.
Step 508, MIHF has scanned the 3GPP network, sends the MIH_ScanResponse message of carrying scanning result and gives MIH User unit, comprises the signal quality information of 3GPP network and WiMAX network in this scanning result.
Step 509, the signal quality information of 3GPP network is known according to scanning response message in MIH User unit, if the signal quality of this 3GPP network meets the demands execution in step 510; If the signal quality of 3GPP network does not meet the demands, then scan for networks tabulation medium priority is lower than the 3GPP network of network, when being met the demands by the signal quality of scan for networks, and execution in step 510.
Step 510, MIH User unit sends Attach Request message to the PoA-C1 of 3GPP network.
Step 511a-511b, MN proceed to the authentication and the registration of the 3GPP webserver (AAA/HSS).
Step 512, if the authentication among the step 511a-511b with succeed in registration, the PoA-C1 of 3GPP network returns Attach Response to the MIH of MN User unit, MN adheres to the 3GPP network.
Through the network selecting method that present embodiment provides, can realize that portable terminal selects suitable network to adhere between the network of multiple access technology type.
Step 101 among above-mentioned two embodiment and step 501 can be implemented under the MN initial network entry carries out the situation of network selecting; Also can reside under the situation of a certain initial network at MN; When this MN is in idle condition after after a while; This MN will carry out implementing under the scene of network reselection, and the network selecting scene when promptly the network selecting method that provides of the embodiment of the invention promptly is applicable to initial network entry also is applicable to the scene of network reselection.
Above-mentioned two embodiment all between the network of two kinds of access technology types, carry out network selecting with MN or network reselection is an example; But application of the present invention is not limited to the situation of above-mentioned two embodiment, also can be used for MN and between the network of two or more access technology types, carries out network selecting or network reselection.
Embodiment three
Present embodiment is introduced a kind of portable terminal in detail, and this portable terminal can be implemented between the network of multiple access technology type and carries out the network selecting of initial network entry or carry out the network reselection under the idle condition.Shown in Fig. 6 a, this portable terminal 600 comprises: network information acquiring unit 601, network list generation unit 602, scanning element 603 and network selecting unit 604, wherein,
Network information acquiring unit 601 obtains the information of ambient network; Network list generation unit 602 generates network list according to the information of above-mentioned ambient network; Network in scanning element 603 these network lists of scanning; Acquisition is by the signal quality information of scan for networks, and network selecting unit 604 selects the network in this network list to adhere to according to said network list and said by the signal quality information of scan for networks.Said ambient network is the network of different access technologies type.
Shown in Fig. 6 b, network list generation unit 602 may further include: sequencing unit 6021 generates subelement 6022 with network list, wherein,
Sequencing unit 6021 carries out prioritization according to the policy information that presets and the information of ambient network to ambient network, and network list generation subelement 6022 generates the network list according to prioritization according to the prioritization of sequencing unit 6021.
Shown in Fig. 6 c-Fig. 6 e, can there be following several kinds of structures network selecting unit 604:
Network selecting unit 604 shown in Fig. 6 c further comprises recognition unit 6041 and network selecting subelement 6042.In the portable terminal 600 of this structure; Scanning element 603 scanning is said to have each network in the network list of prioritization; Obtain the signal quality information of all-network; The network that recognition unit 6041 meets the demands according to the signal quality information identification signal quality of all-network selects network to adhere to according to priority in the network that the signal quality that network selecting subelement 6042 identifies at recognition unit 6041 meets the demands.
Network selecting unit 604 shown in Fig. 6 d further comprises: recognition unit 6043 and command unit 6044.In the portable terminal 600 of this structure; Scanning element 603 is according to the network in the tabulation of priority orders scan for networks; And current signal quality information by scan for networks sent to the recognition unit 6043 in the network selecting unit 604; Recognition unit 6043 is according to current current by the signal quality of scan for networks by the identification of the signal quality information of scan for networks; And recognition result sent to command unit 6044, when recognition result is a current signal quality by scan for networks when meeting the demands, the said portable terminal of command unit 6044 instructions is selected said currently adhered to by scan for networks; When recognition result is current when not met the demands by the signal quality of scan for networks, the network of the next priority of said scanning element 603 scannings of command unit 6044 instructions.
Network selecting unit 604 shown in Fig. 6 e further comprises: recognition unit 6045, sequencing unit 6046 and network selecting subelement 6047.Wherein, Recognition unit 6045 is according to the network that is met the demands by the signal quality information identification signal quality of scan for networks; The network based policy information that presets that sequencing unit 6046 meets the demands signal quality and the information of ambient network are carried out prioritization, and network selecting subelement 6047 selects network to adhere to according to the prioritization of sequencing unit 6046.
The information of ambient network comprises in the present embodiment: the data rate that network provides, quality of service capabilities, security mechanism, operating cost or professional ability.
Through the portable terminal that present embodiment provides, can be implemented in and select suitable network to adhere between the network of multiple access technology type.
Embodiment four
Present embodiment provides the communication system of network selecting method among a kind of embodiment of realization one and the embodiment two; This communication system comprises: portable terminal and media-independent server; Wherein, portable terminal can be suitable for the portable terminal that embodiment three provides, and repeats no more here; The media-independent server stores also provides the information of ambient network to portable terminal, and this ambient network comprises the network of different access technologies type.
The information of ambient network comprises in the present embodiment: the data rate that network provides, quality of service capabilities, security mechanism, operating cost or professional ability.
Through network selecting method, portable terminal and the communication system that above embodiment provides, can realize that portable terminal selects suitable network to adhere between the network of multiple access technology type.
In order to restriction protection scope of the present invention, protection scope of the present invention is not as the criterion with the scope of claim above specific embodiment.

Claims (17)

1. a network selecting method is characterized in that, said method comprises:
Obtain the information of ambient network, said ambient network is the network of different access technologies type;
Information according to said ambient network generates network list;
Scan the network in the said network list, obtain by the signal quality information of scan for networks;
According to said network list and said, in said network list, select network to adhere to by the signal quality information of scan for networks.
2. network selecting method according to claim 1 is characterized in that, said network list is the network list according to prioritization according to the information generation of policy information that presets and said ambient network.
3. network selecting method according to claim 2; It is characterized in that; Network in the said network list of said scanning; Acquisition is specially by the signal quality information of scan for networks: scan the network in the said network list according to priority orders, obtain current by the signal quality information of scan for networks.
4. network selecting method according to claim 3 is characterized in that, and is said according to said network list and said by the signal quality information of scan for networks, in said network list, selects network to adhere to, and specifically comprises:
If said current signal quality by scan for networks meets the demands, then select currently to be adhered to by scan for networks;
If said current signal quality by scan for networks does not meet the demands, then the network of the next priority of instruction scan when being met the demands by the signal quality of scan for networks, selects the said network that is scanned to adhere to.
5. network selecting method according to claim 2; It is characterized in that; Network in the said network list of said scanning, acquisition by the signal quality information of scan for networks is: scan each network in the said network list, obtain the signal quality information of all-network in the said network list.
6. network selecting method according to claim 5 is characterized in that, and is said according to said network list and said by the signal quality information of scan for networks, in said network list, selects network to adhere to, and specifically comprises:
The network that meets the demands according to the signal quality information identification signal quality of all-network in the said network list;
In the network that said signal quality meets the demands, select network to adhere to according to the priority of said network list.
7. network selecting method according to claim 1; It is characterized in that; Network in the said network list of said scanning, acquisition by the signal quality information of scan for networks is: scan each network in the said network list, obtain the signal quality information of all-network in the said network list.
8. network selecting method according to claim 7 is characterized in that, and is said according to said network list and said by the signal quality information of scan for networks, in said network list, selects network to adhere to, and specifically comprises:
The network that meets the demands according to the signal quality information identification signal quality of all-network in the said network list;
The network based policy information that presets that said signal quality is met the demands and the information of said ambient network are carried out prioritization;
Select network to adhere to according to priority.
9. according to the arbitrary described network selecting method of claim 1-8, it is characterized in that the information of said ambient network comprises: the data rate that network provides, quality of service capabilities, security mechanism, operating cost or professional ability.
10. a portable terminal is characterized in that, said portable terminal comprises:
Network information acquiring unit is used to obtain the information of ambient network, and said ambient network is the network of different access technologies type;
The network list generation unit is used for generating network list according to the information of said ambient network;
Scanning element is used for scanning the network of said network list, obtains by the signal quality information of scan for networks; With
The network selecting unit is used for selecting the network in the said network list to adhere to according to said network list and said by the signal quality information of scan for networks.
11. portable terminal according to claim 10 is characterized in that, said network list generation unit comprises:
First sequencing unit is used for according to the policy information that presets and the information of said ambient network ambient network being carried out prioritization.
12. portable terminal according to claim 11 is characterized in that,
Said scanning element is further used for: scan each network in the said network list, obtain the signal quality information of all-network in the said network list;
Said network selecting unit further comprises:
First recognition unit is used for the network that the signal quality information identification signal quality according to said network list all-network meets the demands; With
The first network selecting subelement is used for the network that meets the demands at the signal quality that said first recognition unit identifies, selects network to adhere to according to priority.
13. portable terminal according to claim 11 is characterized in that,
Said scanning element is further used for: scan the network in the said network list according to priority orders, and obtain current by the signal quality information of scan for networks;
Said network selecting unit further comprises:
Second recognition unit is used for discerning according to said current signal quality information by scan for networks said current by the signal quality of scan for networks, obtains recognition result; With
Command unit; Be used for when said recognition result be that current signal quality by scan for networks is when meeting the demands; Instruct said portable terminal to select said currently adhered to by scan for networks; When said recognition result is current when not met the demands by the signal quality of scan for networks, instruct said scanning element to scan the network of next priority.
14. portable terminal according to claim 10 is characterized in that,
Said network selecting unit further comprises:
The 3rd recognition unit is used for the network that is met the demands by the signal quality information identification signal quality of scan for networks according to said;
Second sequencing unit, the network based policy information that presets that is used for said signal quality is met the demands and the information of said ambient network are carried out prioritization; With
The second network selecting subelement is used for selecting network to adhere to according to the prioritization of said second sequencing unit.
15., it is characterized in that the information of said ambient network comprises: the data rate that network provides, quality of service capabilities, security mechanism, operating cost or professional ability according to the arbitrary said portable terminal of claim 10-14.
16. a communication system is characterized in that, said communication system comprises:
Portable terminal; Be used to obtain the information of ambient network; And generate network list according to the information of said ambient network, and scan the network in the said network list, obtain by the signal quality information of scan for networks; According to said network list and said, in said network list, select network to adhere to by the signal quality information of scan for networks; With
The media-independent server is used to store and provide the information of said ambient network;
Said ambient network is the network of different access technologies type.
17., it is characterized in that the information of said ambient network comprises according to the said communication system of claim 16: the data rate that network provides, quality of service capabilities, security mechanism, operating cost or professional ability.
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