CN101557633A - Target network selection method and access point device - Google Patents
Target network selection method and access point device Download PDFInfo
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- CN101557633A CN101557633A CNA2008101036236A CN200810103623A CN101557633A CN 101557633 A CN101557633 A CN 101557633A CN A2008101036236 A CNA2008101036236 A CN A2008101036236A CN 200810103623 A CN200810103623 A CN 200810103623A CN 101557633 A CN101557633 A CN 101557633A
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Abstract
The invention discloses a target network selection method and an access point device which are used for achieving link switch of a mobile terminal between heterogeneous wireless networks. The method comprises the following steps that: a service access point of a current service network of the mobile terminal switches a preparation request message to surrounding networks by broadcast; various target access points calculate the support margin value of a local network by the set calculation rule according to current usable network resource information of the local network and resource demand information of the mobile terminal and determine timing time which is in inverse proportion to the support margin value; when the timing time reaches, the broadcast switches initial response; and the service access point receives the first returned response message for switching equipment, then sends a switching initial response to the mobile terminal and indicates the mobile terminal to switch. When being applied to the target network switching, the target network selection method greatly reduces the transmission quantity of signals, simplifies the signaling interactive flow and reduces the switching delay.
Description
Technical field
The present invention relates to moving communicating field, refer to a kind of target network selection method and access point apparatus of realizing that portable terminal switches between heterogeneous wireless network especially.
Background technology
Along with the develop rapidly of the communication technology, new wireless access technology continues to bring out.In order to bring better experience to the user, satisfy diversified business demand, the multiple network of using different access technologies has been laid by operator.The variation of the moving of professional selection, user, network quality all may cause the switching of terminal between heterogeneous network.Of future generation is in the mobile communications network of core with IP, because IP layer processing time delay for switching is very big, it is very crucial that the performance of the link level handover scheme of heterogeneous network just seems.
The link level switching comprises switching initialization (Handover Initiation), switches and prepare (HandoverPreparation) and switch to carry out (Handover Execution) three phases.Can trigger by portable terminal or network side.With the network side triggering is example, and present switching flow is as follows:
When current network conditions is not enough to satisfy the demand of current business, the Service Access Point of current service network sends the indication that is about to close link by remote events to portable terminal, after portable terminal is received this indication, to send the switching initialization request command to Service Access Point, after Service Access Point is received this request, other network elements in network environment are broadcasted handover preparation request orders.After the Service Access Point of other available networks is received this handover preparation request order, will return the handover preparation request response, allocate resource with requiring for portable terminal according to the situation of present resource simultaneously.Current Service Access Point is received after the response that the Service Access Point of a plurality of available networks sends, to send the switching initialization response to portable terminal, after portable terminal is received this response, select best target access and send switching execution request command to current Service Access Point from a plurality of available target access, the decision of notification service access point portable terminal switches to which objective network and target access.The current service access point sends to switch to portable terminal carries out the request response, and after portable terminal received, affirmation can be switched, so the contact of beginning data link layer.The portable terminal successful switch is after target access, and target access sends to switch to original Service Access Point finishes request command, notifies its portable terminal to finish switching, and former Service Access Point can be finished operations such as data forwarding according to this order.Peripherad all the available targets access points of former Service Access Point send to switch finishes the request response, former Service Access Point discharges the resource of original and communication of mobile terminal, is not moved other target access that terminal adopts and also is released to this portable terminal reserved resource.
For realizing the seamless switching of portable terminal in heterogeneous network, IEEE 802.21 working groups, worked out media-independent switching (MIH, Media Independent Handover) mechanism: between data link layer and network layer, introduce a new sublayer---MIH layer.By and the data link layer of different access technologies and physical layer between mutual, and the communication between the MIH layer of equity comes the isomerism to upper strata shielding bottom access network, the media-independent of having realized heterogeneous network switches, thereby simplifies the operation and the management of network.Heterogeneous network can comprise IEEE 802.21, and IEEE 802.16, and IEEE 802.15,3GPP and 3GPP2 etc.The media-independent handover mechanism provides three types service: media-independent Event Service (MIH-ES), media-independent command service (MIH-CS) and media-independent service (MIH-IS).
Describe for simplifying, suppose that portable terminal and network side (access point AP or base station BS) all switch (Media Independent Handover by upper strata (UpLayer), media-independent, MIH) (Media Access Control, MAC) functional entity is formed in functional entity and media interviews control.When portable terminal is cut into the another one access point from an access point, the access point at portable terminal place is called Service Access Point (ServingAP), and the available access point that portable terminal may switch to is called target access (Target AP).So, based on 802.21 defined media independent handovers mechanism, the signalling interactive process of existing handover scheme as shown in Figure 1, concrete step comprises:
Step 1: the upper strata of portable terminal is indicated according to the incident that MIH-ES provided and is determined whether that needs send the switching initialization request.If need, then send the switching initialization request to current Service Access Point by the MIH remote events.
Step 2: current Service Access Point is received after the switching initialization request, sends handover preparation request with regard to peritropous each target access.
Step 3: after each target access is received handover preparation request, inquire about the tabulation of present resource behaviour in service and requested resource,, then tabulate to the portable terminal reserved resource according to requested resource if meet the demands, otherwise the refusal request; Simultaneously, send switching to Service Access Point and prepare response.
Step 4: Service Access Point sends the switching initialization response to portable terminal after the switching preparation response of receiving from each target access.
Step 5: portable terminal is selected the optimal target access point according to certain selection criterion from a plurality of available target access, sends to Service Access Point and switches the request of execution, and the decision of notification service access point switches to which target access and objective network.
Step 6: the current service access point sends to switch to portable terminal carries out response, and portable terminal just can be set up new connection between portable terminal and the optimal objective of selecting access point after affirmation can be switched.
Step 7: when the portable terminal successful switch after the optimal objective access point, target access sends to switch to former Service Access Point finishes request, notifies its portable terminal successful switch.
Step 8: former Service Access Point discharges resource, and notifies not selected target access also to discharge resource.
Above-mentioned flow process is the switching flow of being initiated by mobile terminal side in the prior art.Also there is the switching flow of initiating in the prior art simultaneously by network side.But no matter be to initiate to switch by mobile terminal side or network side, according to existing hand off signaling interaction flow, portable terminal all needs to concentrate the network of relation information of obtaining all available targets networks and target access from the current service access point, thereby selects best target access according to the information of obtaining from a plurality of available target access.Such demand requires the current service access point to collect the relevant network information of all available targets access points, selects to concentrate relatively.
Present way is to utilize the available targets access point to send the chance of switching the preparation response to the current service access point Internet resources situation is separately informed the current service access point.Therefore, Service Access Point only after response is prepared in the switching of receiving the target access available from all, could send the switching initialization response to portable terminal.The shortcoming of this switching flow is: concentrate the way of the relevant information of collecting all available networks to increase working transmission, increased handover delay, be unfavorable for the improvement of performance of handoffs.And this drawback can be serious further along with the number of available network increases.
Summary of the invention
The invention provides a kind of target network selection method and access point apparatus, when carrying out the heterogeneous wireless network switching, realize that portable terminal can switch to the objective network of function admirable fast.
A kind of target network selection method is applied to heterogeneous wireless network and switches, and comprising:
The Service Access Point of portable terminal current service network is according to the switching demand of this portable terminal, Web broadcast handover preparation request message towards periphery;
Receive each target access of described handover preparation request message, resource requirement information according to the described portable terminal that carries in the current available network resource information of local network and the described handover preparation request message, the computation rule that employing is set calculates the support allowance value that characterizes local network support terminal link ability size, and determines the timing time that is inversely proportional to and concerns with described support allowance value; And when described timing time arrived, the preparation response message was switched in broadcasting;
Described Service Access Point sends the switching initialization response to described portable terminal after receiving first switching of returning preparation response message, indicates described portable terminal to return the target access of switching the preparation response message to first and switches.
According to said method of the present invention, before the described broadcasting handover preparation request message, also comprise:
Described portable terminal switches the incident indication that MIH provided according to media-independent, determines to carry out network when switching, and sends the switching initialization request to the Service Access Point of current service network;
Described Service Access Point receives described switching initialization request.
According to said method of the present invention, described calculating characterizes the support allowance value of local network support terminal link ability size, is specially:
When the current available network resource of local network can not satisfy the Internet resources of described portable terminal demand, described support allowance value was zero;
When the current available network resource of local network can satisfy the Internet resources of described portable terminal demand, the current corresponding performance index value that can provide of performance index value that comprises in the resource requirement information according to described portable terminal and local network calculates described support allowance value.
According to said method of the present invention, before calculating the support allowance value that characterizes local network support terminal link ability size, also comprise:
Resolve the resource requirement information of the portable terminal that carries in the described handover preparation request message, obtain the current available network resource information of local network, judge whether the current available network resource of local network satisfies the Internet resources of described portable terminal demand.
According to said method of the present invention, calculate described support allowance value, specifically comprise:
When only comprising the single performance desired value in the resource requirement information of described portable terminal, described single performance desired value according to current described single performance desired value that can provide of local network and described portable terminal demand, calculate both ratio, obtain described support allowance value; Perhaps
When comprising more than one performance index value in the resource requirement information of described portable terminal,, calculate both ratio respectively according to this single performance desired value of current corresponding single performance desired value that can provide of local network and described portable terminal demand; And according to the weight coefficient of each performance index of setting, add up again multiply by the weight coefficient of its corresponding performance index with each ratio that calculates after, with after adding up with value as described support allowance value.
According to said method of the present invention, before both ratio of described calculating, also comprise:
Resolve the one or more performance index value that comprises in the resource requirement information of described portable terminal; And
The current corresponding performance index value that can provide of local network is provided.
Said method of the present invention also comprises:
Listen to described switching and prepare the target access of response message, stop timing.
A kind of access point apparatus comprises: terminal resource demand information acquisition module, network resource information acquisition module, computing module, time block and sending module;
Described terminal resource demand information acquisition module is used to receive handover preparation request message, resolves the resource requirement information of the portable terminal that carries in the described handover preparation request message;
Described network resource information acquisition module is used to obtain the current available network resource information of local network;
Described computing module, according to the current available network resource information of local network and the resource requirement information of described portable terminal, the computation rule that employing is set calculates the support allowance value that characterizes local network support terminal link ability size, and determines the timing time that is inversely proportional to and concerns with described support allowance value;
Described time block, the timing time that is used for determining according to described computing module carries out timing;
Described sending module is used for when described time block timing time arrives, and the preparation response message is switched in broadcasting.
According to said apparatus of the present invention, described computing module further comprises: judge submodule, first calculating sub module and second calculating sub module;
Described judgement submodule, the resource requirement information that is used for the described portable terminal that parses according to described terminal resource demand information acquisition module, and the current available network resource information of the local network that obtains of described network resource information acquisition module, judge whether the current available network resource of local network satisfies the Internet resources of described portable terminal demand; When the current available network resource of judging local network can satisfy the Internet resources of described portable terminal demand, notify first calculating sub module; When the current available network resource of judging local network can not satisfy the Internet resources of described portable terminal demand, notify second calculating sub module;
Described first calculating sub module is used for setting and supports that the allowance value is zero, and the timing duration is infinitely great;
Performance index value and the current corresponding performance index value that can provide of local network that resource requirement information according to described portable terminal comprises are provided described second calculating sub module, calculate described support allowance value; And determine with described support allowance value be inversely proportional to the relation timing time.
Said apparatus of the present invention also comprises:
Handover module is used for the switching initialization request that mobile terminal receive sends, towards periphery Web broadcast handover preparation request message; And after receiving first switching of returning preparation response message, send the switching initialization response to described portable terminal, indicate described portable terminal to return the target access of switching the preparation response message and switch to first.
According to target network selection method provided by the invention and access point apparatus, the Service Access Point of portable terminal current service network is broadcasted handover preparation request message towards periphery according to the switching demand of this portable terminal; Each target access that receives handover preparation request message is according to the current available network resource information of local network and the resource requirement information of portable terminal, adopt the computation rule of setting, the timing time of preparing response is switched in support allowance and the transmission of determining local network, makes the optimal target access point to send at first and switches the preparation response; After the current service access point receives first switching preparation response, indicating mobile terminal returns the target access of switching the preparation response to first and switches, need not portable terminal and concentrate the network of relation information of obtaining all available targets access points from the current service access point, as long as receive the switching preparation response that any one available targets access point sends, just can send the switching initialization response to portable terminal, above-mentioned target network selection method, when being applied to the heterogeneous wireless network switching, significantly reduced working transmission, simplify the Signalling exchange flow process, effectively reduced handover delay.
Description of drawings
Fig. 1 is the signaling process figure of wireless network switching method in the prior art;
The heterogeneous wireless network changing method flow chart of steps that Fig. 2 provides for the embodiment of the invention;
Fig. 3 realizes the signaling process figure that heterogeneous wireless network switches in the embodiment of the invention one;
Fig. 4 realizes the signaling process figure that heterogeneous wireless network switches in the embodiment of the invention two;
Fig. 5 realizes the signaling process figure that heterogeneous wireless network switches in the embodiment of the invention three;
The structural representation of the access point apparatus that Fig. 6 provides for the embodiment of the invention.
Embodiment
The invention provides a kind of target network selection method, being applied to heterogeneous wireless network switches, behind the access point of the Service Access Point of portable terminal or current service network with the known ambient network of handoff request, the identical criterion of each comfortable local employing of each available targets access point makes decisions, the distributed optimal objective access point of selecting reinforms current service access point and portable terminal and switches.Initiating switching flow with mobile terminal side below is that example is described in detail, its flow process as shown in Figure 2, execution in step is as follows:
Step S101: portable terminal sends the switching initialization request to the Service Access Point of current service network.
Portable terminal is indicated according to the incident that MIH provided and is determined whether that needs carry out network and switch; When needs, then send the switching initialization request to the Service Access Point of current service network by the MIH remote events.Carry the resource requirement information of portable terminal in the switching initialization request that sends,, can also carry the interface message of portable terminal as bandwidth demand, time delay demand etc., as: portable terminal supporting interface standard etc.
Step S102: the current service access point is Web broadcast handover preparation request message towards periphery.
After the current service access point receives the switching initialization request of portable terminal transmission, send handover preparation request message with peripherad each available target access of form of broadcasting.Wherein, each available target access around the resource requirement information of portable terminal and interface message can be informed by handover preparation request message.
Especially, do not send at portable terminal under the situation of switching initialization request, if determining portable terminal, the Service Access Point of the current service network of this portable terminal need carry out network when switching, also Web broadcast handover preparation request message towards periphery starts the network switching flow of portable terminal.
Step S103: each target access is according to the current available network resource information and the resource requirement information that receives the described portable terminal that carries in the described handover preparation request message of local network, adopt identical computation rule, calculate and characterize the support allowance value that local network is supported portable terminal link ability size; And determine the timing time that is inversely proportional to and concerns with described support allowance value, when timing time arrived, then the preparation response was switched in broadcasting.Be specially:
After each target access is received handover preparation request message, resolve the resource requirement information (can be the Resources list of mobile terminal request) of the portable terminal that carries in the described handover preparation request message, and obtain the current available network resource information of local network, judge whether the current available network resource of local network satisfies the Internet resources of described portable terminal demand.If local Internet resources can satisfy the resource requirement of portable terminal, then give the portable terminal reserved resource according to the Resources list of mobile terminal request, otherwise the handoff request of refusal portable terminal.
Under the situation that can satisfy the mobile terminal resource demand, each target access is according to the resource requirement information of the portable terminal that is obtained, and the current available network resource information of local network, according to the identical calculations criterion, calculate the ability size of the support terminal link of local network separately.And the support allowance by calculating local network (Support Margin, SM) value quantizes to reflect the size of local network to the tenability of portable terminal linking request.Support that the allowance value is big more, the ability that expresses support for is strong more.
The decision local network supports the factor of allowance value size to comprise: portable terminal to the service quality of supporting business (Quality of Service, QoS) demand is as demand bandwidth, demand time delay, demand expense etc.; And the network condition of local network, as: transmission bandwidth, propagation delay time, expense etc.Under the different situations, the account form of SM is also different.
Support the definite of allowance value specifically to comprise:
At first, resolve the one or more performance index value that comprises in the resource requirement information of portable terminal; And obtain the current corresponding performance index value that can provide of local network.
(1) when the current available network resource of each target access local network can not satisfy the resource requirement of portable terminal, for example: bandwidth can not satisfy the upper limit that the bandwidth demand of portable terminal, delay requirement that time delay does not satisfy portable terminal or expense be higher than the portable terminal expect cost etc., then supports the allowance value to be made as zero;
(2) when the current available network resource of each target access local network can satisfy the resource requirement of portable terminal, the current corresponding performance index value that can provide of performance index value that comprises in the resource requirement information according to portable terminal and local network, calculate and support the allowance value, concrete account form is:
(i) when only comprising single performance desired value (for example only require bandwidth or only require time delay) in the resource requirement information of portable terminal, this single performance desired value according to current corresponding single performance desired value that can provide of local network and portable terminal demand, calculate both ratio, supported allowance value, for example:
This single performance that calculating local network can provide refers to that this single performance of target value and portable terminal demand refers to the ratio of target value, obtains described support allowance value;
Or this single performance that calculates the portable terminal demand refers to that this single performance that target value and local network can provide refers to the ratio of target value, obtains described support allowance value;
(ii) when comprising more than one performance index value (for example not only requiring bandwidth but also require time delay or network charges) in the resource requirement information of portable terminal, according to this single performance desired value of current corresponding single performance desired value that can provide of local network and portable terminal demand, calculate both ratio respectively; And according to the weight coefficient of each performance index of setting, add up again multiply by the weight coefficient of its corresponding performance index with each ratio that calculates after, with after adding up with the support allowance value of value as local network, be specially:
The ratio of the value of the value of first performance index that the calculating local network can provide and first performance index of portable terminal demand; Or the ratio of the value of the value of first performance index of calculating portable terminal demand and first performance index that local network can provide, obtain first and support the allowance value;
The ratio of the value of the value of second performance index that the calculating local network can provide and second performance index of portable terminal demand; Or the ratio of the value of the value of second performance index of calculating portable terminal demand and second performance index that local network can provide, obtain second and support the allowance value;
By that analogy, obtain the support allowance value of each performance index;
After the support allowance value of above-mentioned each performance index was multiplied by each self-corresponding weight coefficient respectively, summation again obtained the support allowance value of local network.
Annotate: the value of above-mentioned weight coefficient is all between 0 and 1, and all weight coefficient sums are 1.
To adopt the countdown mode is example, determines to send according to the support allowance value of the local network that calculates and switches the countdown time T of preparing response, and wherein, the countdown time T is inversely proportional to supporting the allowance value.When supporting that the allowance value is 0, the countdown duration is infinitely great.
According to the countdown time T that calculates, the beginning countdown, in case timer to 0, corresponding target access will be sent to switch and prepare response message in the mode of broadcasting.
Because each objective network is broadcasted known handover preparation request message, therefore can think that each objective network is to begin countdown simultaneously.
Step S104: the current service access point sends the switching initialization response to portable terminal.
The current service access point receives after first switch to prepare response, then sends the switching initialization response to portable terminal, and indicating mobile terminal returns to first and switches the target access (being the optimal objective access point) of preparing response and switch.
Other target access (being non-optimal objective access point) have been in case listened to the broadcasting of a certain target access and switch and prepare response, just think that the optimal target access point selects, and stop the timer timing and keep mourning in silence.
Step S105: portable terminal sends to the current service access point and switches the request of execution.
Step S106: the current service access point sends to switch to portable terminal carries out response.
Portable terminal receives after switching that the current service access point sends carries out response, after promptly confirming to switch, returns with first and to switch target access of preparing response and set up new Radio Link and be connected.
Step S107: set up new Radio Link and be connected when portable terminal and first return (i.e. optimum) target access of switch preparing response, after completing successfully switching, first returns the target access of switching the preparation response and finishes request to current service access point transmission switching, and notification service access point portable terminal has completed successfully switching.
Step S108: current service access point releasing network resources, and notify not selected target access also to discharge resource.
Embodiment one:
When with bandwidth during as main performance index select target network, its signaling process as shown in Figure 3, the specific implementation process is as follows:
When portable terminal (for example STA among Fig. 3) indicates to determine that according to the incident that MIH provided needs carry out the network switching, by the MIH remote events to the current service access point, for example the Service Access Point among Fig. 3 (Serving AP/BS) sends the switching initialization request.Carry the bandwidth demand information of portable terminal in the switching initialization request that sends.
After current service access point (Serving AP/BS) receives the switching initialization request that portable terminal sends, with peripherad each available target access of form of broadcasting (for example the TargetAP1/BS1 among Fig. 3 ..., Target APn/BSn etc.) send handover preparation request.Wherein, each available target access around the bandwidth demand information of portable terminal is also informed by handover preparation request.
Each target access, Target AP1/BS1 ..., Target APn/BSn etc., after receiving handover preparation request, bandwidth demand information according to the portable terminal that carries in the handover preparation request, the bandwidth information of inquiry local network, if the bandwidth of local network can satisfy the bandwidth requirement of portable terminal, then give the portable terminal bandwidth reserved according to the bandwidth of request, otherwise the handoff request of refusal portable terminal.
When local network can satisfy the portable terminal bandwidth demand, each target access according to the portable terminal that is obtained to bandwidth demand information, and the local network bandwidth uses information, calculates the support allowance value SM of local network according to predetermined identical computation rule.
When being performance index, support that allowance is calculated as follows with the bandwidth:
If the available bandwidth of local network is: W
S
The bandwidth of portable terminal demand is: W
N
Then support allowance SM to be:
Be example still,, determine local network and send the countdown time T of switching the preparation response according to the support allowance value SM that calculates in the mode that adopts countdown:
T＝C/SM
Wherein, C is a constant, chooses according to concrete needs.
As seen, when local network can't provide the needed bandwidth of portable terminal, it supported that the allowance value is 0, and the countdown time T is infinitely great.When local network can provide the needed bandwidth of portable terminal, obvious W
S/ W
NThe objective network of value maximum, be to be optimal objective network under the performance index meaning with the bandwidth, i.e. optimal objective access point, and because T is inversely proportional to W
S/ W
N, the countdown time of this optimal objective network must be the shortest, and timing at first is to zero, and then first broadcasts switching preparation response to this target access one surely.
Hypothetical target access point 1 among Fig. 3 (Target AP1/BS1) is the optimal objective access point during as performance index with bandwidth, and then target access 1 first broadcasting is switched and prepared response.
The current service access point then sends the switching initialization response to portable terminal after receiving that response is prepared in the switching of target access 1 (Target AP1/BS1) broadcasting.
Other target access (Target AP2/BS2 ..., Target APn/BSn etc.) prepare response in case listen to the switching of target access 1 (Target AP1/BS1) broadcasting, just think that the optimal target access point selects, stop the timer timing and keep mourning in silence.
Portable terminal sends to the current service access point and switches the request of execution then.The current service access point sends to switch to portable terminal carries out response.Portable terminal switches to target access 1 pairing objective network after receiving and switching the execution response.
After portable terminal and target access 1 were set up new Radio Link, target access 1 sends to former Service Access Point (Serving AP/BS) switched the request of finishing, and notice Serving AP/BS portable terminal has completed successfully switching.
Serving AP/BS releasing network resources, and notify not selected target access also to discharge resource.
Embodiment two:
When with the time delay index during as performance index select target network, its signaling process as shown in Figure 4, the specific implementation process is as follows:
When portable terminal (for example STA among Fig. 4) indicates to determine that according to the incident that MIH provided needs carry out the network switching, by the MIH remote events to the current service access point, for example the Service Access Point among Fig. 4 (Serving AP/BS) sends the switching initialization request.Carry the time delay demand information of portable terminal in the switching initialization request that sends.
After current service access point (Serving AP/BS) receives the switching initialization request that portable terminal sends, with peripherad each available target access of form of broadcasting (for example the TargetAP1/BS1 among Fig. 4 ..., Target APn/BSn etc.) send handover preparation request.Wherein, each available target access around the time delay demand information of portable terminal is also informed by handover preparation request.
Each target access, Target AP1/BS1 ..., Target APn/BSn etc., after receiving handover preparation request, time delay demand information according to the portable terminal that carries in the handover preparation request, the time delay information of inquiry local network, if the time delay of local network can satisfy the delay requirement of portable terminal, then proceed subsequent action, otherwise the handoff request of refusal portable terminal.
When local network can satisfy portable terminal time delay demand, each target access according to the portable terminal that is obtained to the time delay demand information, and local network delay information, calculate the support allowance value SM of local network according to predetermined identical computation rule.
When being performance index, support allowance SM to be calculated as follows with the time delay:
If the available time delay of local network is: D
S
The time delay of portable terminal demand is: D
N
Then support allowance SM to be:
Be example still,, determine local network and send the countdown time T of switching the preparation response according to the support allowance value SM that calculates in the mode that adopts countdown:
T＝C/SM
Wherein, C is a constant, can choose according to concrete needs.
As seen, time-delay when local network can't provide portable terminal needed, it supports that allowance is 0, the countdown time T is infinitely great.Time-delay when local network can provide portable terminal needed, obviously D
N/ D
SThe objective network of value maximum, be to be optimal objective network under the performance index meaning with the time delay, i.e. optimal objective access point, and because T is inversely proportional to D
N/ D
S, the countdown time of this optimal objective network must be the shortest, and timing at first is to zero, and then first broadcasts switching preparation response to this target access one surely.
Hypothetical target access point 1 among Fig. 4 (Target AP1/BS1) is the optimal objective access point during as performance index with time delay, and then target access 1 first broadcasting is switched and prepared response.
The current service access point then sends the switching initialization response to portable terminal after receiving the switching preparation response of target access 1 (Target AP1/BS1) broadcasting.
Other target access (Target AP2/BS2 ..., Target APn/BSn etc.) prepare response in case listen to the switching of target access 1 (Target AP1/BS1) broadcasting, just think that the optimal target access point selects, stop the timer timing and keep mourning in silence.
Portable terminal sends to the current service access point and switches the request of execution then, and the current service access point sends to switch to portable terminal carries out response.Portable terminal switches to target access 1 pairing objective network after receiving and switching the execution response.
After portable terminal and target access 1 were set up new Radio Link, target access 1 sends to Service Access Point (Serving AP/BS) switched the request of finishing, and notice Serving AP/BS portable terminal has completed successfully switching.
Serving AP/BS releasing network resources, and notify not selected target access also to discharge resource.
Embodiment three:
Described in embodiment one and the embodiment two is to serve as according to selecting the situation of optimal objective network with single performance index (as bandwidth or time delay).When carrying out the optimal objective network selecting, we are through the combination property of many-sided index of regular meeting's care.For example, in heterogeneous network, the cost status of the network of use different access technologies is different, and the user may also wish that network charges is low as far as possible when requiring bandwidth performance.
By a plurality of performance index select target networks, realize the signaling process that switches from the current service access point to target access as shown in Figure 5, the specific implementation process is as follows:
When portable terminal (for example STA among Fig. 5) indicates to determine that according to the incident that MIH provided needs carry out the network switching, by the MIH remote events to the current service access point, for example the Service Access Point among Fig. 5 (Serving AP/BS) sends the switching initialization request.Carry the bandwidth demand information of portable terminal and the network charges upper-limit information of portable terminal expectation in the switching initialization request that sends.
After current service access point (Serving AP/BS) receives the switching initialization request that portable terminal sends, with peripherad each available target access of form of broadcasting (for example the TargetAP1/BS1 among Fig. 5 ..., Target APn/BSn etc.) send handover preparation request.Wherein, each available target access around the network charges upper-limit information of the bandwidth demand information of portable terminal and portable terminal expectation is also informed by handover preparation request.
Each target access, Target AP1/BS1, ..., Target APn/BSn etc., after receiving handover preparation request, according to the bandwidth demand information of the portable terminal that carries in the handover preparation request and the network charges upper-limit information of portable terminal expectation, the bandwidth information of inquiry local network and the charge situation of local network, if the bandwidth of local network and the requirement that network charges can satisfy portable terminal, then the request according to portable terminal is the portable terminal bandwidth reserved, and charge, otherwise the handoff request of refusal portable terminal according to the local network expenses standard.
When local network can satisfy portable terminal bandwidth demand and network charges requirement, each target access is according to the accessed portable terminal demand bandwidth and the bandwidth usage of local network, and the network charges upper limit of portable terminal requires and the charge situation of local network; According to predetermined identical computation rule, calculate the support allowance value SM of local network.
Because also need to consider the network charges factor when considering bandwidth performance, we incorporate the network charges relevant parameter in the calculating of supporting allowance SM as coefficient and go.With bandwidth and network charges be performance index the time, support allowance to be calculated as follows:
If the available bandwidth of local network is: W
S
The network charges of local network: P
S
The bandwidth of portable terminal demand is: W
N
The expense upper limit of portable terminal expectation: P
N
Bandwidth demand weight coefficient: α
W
Expense demand weight coefficient: α
P
Then support allowance SM to be:
Wherein, bandwidth demand weight coefficient α
WWith expense demand weight coefficient α
PCan regulate according to the desirability of reality,, make α usually for normalized purpose
P+ α
W=1, and 0≤α
P, α
W≤ 1.
Be example still,, determine local objective network and send the countdown time T of switching the preparation response according to the support allowance value SM that calculates in the mode that adopts countdown:
T＝C/SM
Wherein, C is a constant, chooses according to concrete needs.
As seen, when local network can't provide current link needed bandwidth, perhaps the local network expense surpasses the upper limit of user expectation expense, supports that then allowance is 0, and the countdown time T be an infinity.
When local network can provide portable terminal needed bandwidth, and the local network expense is lower than going up in limited time of user expectation expense, obviously P
N/ P
SBig more, T is more little; W
S/ W
NBig more, T is also more little.P
N/ P
S+ W
S/ W
NThe objective network of value maximum, be as the optimal objective network under the integrated performance index meaning, i.e. optimal objective access point with bandwidth and network charges; And because T is inversely proportional to P
N/ P
S+ W
S/ W
N, the countdown time of this optimal objective network must be the shortest, and timing at first is to zero, and then first broadcasts switching preparation response to this target access one surely.
And α
PAnd α
WAs with expense demand and the relevant weight coefficient of bandwidth demand, can regulate according to the desirability for various performances in the actual conditions.Under opposite extreme situations, if α
P=0, α
W=1, mean then and only pay close attention to bandwidth performance that the height of expense is not considered; If α
P=1, α
W=0, then mean under the network bandwidth satisfies the demands the prerequisite of bandwidth, wish that network charges is low as far as possible.
Hypothetical target access point 1 among Fig. 5 (Target AP1/BS1) is the optimal objective access point during as integrated performance index with bandwidth and network charges, and then target access 1 first broadcasting is switched and prepared response.
The current service access point then sends the switching initialization response to portable terminal after receiving the switching preparation response of target access 1 (Target AP1/BS1) broadcasting.
Other target access (Target AP2/BS2 ..., Target APn/BSn etc.) prepare response in case listen to the switching of target access 1 (Target AP1/BS1) broadcasting, just think that the optimal target access point selects, stop the timer timing and keep mourning in silence.
Portable terminal sends to the current service access point and switches the request of execution then, and the current service access point sends to switch to portable terminal carries out response.Portable terminal switches to target access 1 pairing objective network after receiving and switching the execution response.
After portable terminal and target access 1 were set up new Radio Link, target access 1 sends to Service Access Point (Serving AP/BS) switched the request of finishing, and notice Serving AP/BS portable terminal has completed successfully switching.
Serving AP/BS releasing network resources, and notify not selected target access also to discharge resource.
It is to be noted, three top embodiment have just provided how to design distributed switching criterion and switching flow according to optimization aim under concrete performance requirement, the design of this switching criterion may be at certain single optimization in Properties, also may be the optimization of taking all factors into consideration at various performance index.Support the specific design of allowance function to be not limited to above-mentioned application example,, support that the design of allowance function can be varied as long as can reach the purpose of optimizing performance.
In addition, different business for performance index define and the concern meeting different.In practical operation, can consider to select different support allowance definition according to the division of class of business.
According to said method of the present invention, can make up the access point apparatus in a kind of heterogeneous wireless network, as shown in Figure 6, comprising: terminal resource demand information acquisition module 101, network resource information acquisition module 102, computing module 103, time block 104 and sending module 105.
Terminal resource demand information acquisition module 101 is used to receive the switching initialization request message, resolves the resource requirement information of the portable terminal that carries in the described handover preparation request message.
Network resource information acquisition module 102 is used to obtain the current available network resource information of local network.
Preferable, computing module 103 may further include: judge submodule 1031, first calculating sub module 1032 and second calculating sub module 1033.
Judge submodule 1031, the resource requirement information that is used for the portable terminal that parses according to terminal resource demand information acquisition module 101, and the current available network resource information of the local network that obtains of network resource information acquisition module 102, judge whether the current available network resource of local network satisfies the Internet resources of portable terminal demand; When the current available network resource of judging local network can satisfy the Internet resources of portable terminal demand, notify first calculating sub module 1032; When the current available network resource of judging local network can not satisfy the Internet resources of portable terminal demand, notify second calculating sub module 1033;
First calculating sub module 1032 is used for setting and supports that the allowance value is zero, and the timing duration is infinitely great;
Performance index value and the current corresponding performance index value that can provide of local network that resource requirement information according to portable terminal comprises are provided second calculating sub module 1033, calculate and support the allowance value; And determine and support the allowance value be inversely proportional to the relation timing time.
Sending module 105 is used for when time block 104 timing times arrive, and the preparation response message is switched in broadcasting.
Above-mentioned access point apparatus of the present invention also comprises: handover module 106 is used for the switching initialization request that mobile terminal receive sends, towards periphery Web broadcast handover preparation request message; And after receiving first switching of returning preparation response message, sending the switching initialization response to portable terminal, indicating mobile terminal returns the target access of switching the preparation response message to first and switches.
Above-mentioned target network selection method provided by the invention and access point apparatus, when being applied to the heterogeneous wireless network switching, the target access of each objective network is according to the current available network resource information of local network and the resource requirement information of portable terminal, adopt the computation rule of setting, determine local network and support the link ability size (promptly supporting allowance) of mobile terminal request, obtain sending the timing time that switches the preparation response, make the timer of optimal target access point can arrive timing time at first, and adopt the mode of broadcasting to send switching preparation response at first; The current service access point only need wait until that the switching that any one available targets access point sends prepares response, just can send the switching initialization response to portable terminal, and indicating mobile terminal returns to first and switches the target access of preparing response and switch; Need not portable terminal and concentrate the network of relation information of obtaining all available targets access points, thereby reduced working transmission greatly, simplified the Signalling exchange flow process from the current service access point; Greatly reduce handover delay simultaneously, improved performance of handoffs.Under the increasing situation of the number of available network, the inventive method can effectively reduce the advantage of handover delay can be obvious further.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily, replace or be applied to other similar devices, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1, a kind of target network selection method is applied to heterogeneous wireless network and switches, and it is characterized in that, comprising:
The Service Access Point of portable terminal current service network is according to the switching demand of this portable terminal, Web broadcast handover preparation request message towards periphery;
Receive each target access of described handover preparation request message, resource requirement information according to the described portable terminal that carries in the current available network resource information of local network and the described handover preparation request message, the computation rule that employing is set calculates the support allowance value that characterizes local network support terminal link ability size, and determines the timing time that is inversely proportional to and concerns with described support allowance value; And when described timing time arrived, the preparation response message was switched in broadcasting;
Described Service Access Point sends the switching initialization response to described portable terminal after receiving first switching of returning preparation response message, indicates described portable terminal to return the target access of switching the preparation response message to first and switches.
2, the method for claim 1 is characterized in that, before the described broadcasting handover preparation request message, also comprises:
Described portable terminal switches the incident indication that MIH provided according to media-independent, determines to carry out network when switching, and sends the switching initialization request to the Service Access Point of current service network;
Described Service Access Point receives described switching initialization request.
3, the method for claim 1 is characterized in that, described calculating characterizes the support allowance value of local network support terminal link ability size, is specially:
When the current available network resource of local network can not satisfy the Internet resources of described portable terminal demand, described support allowance value was zero;
When the current available network resource of local network can satisfy the Internet resources of described portable terminal demand, the current corresponding performance index value that can provide of performance index value that comprises in the resource requirement information according to described portable terminal and local network calculates described support allowance value.
4, method as claimed in claim 3 is characterized in that, before calculating the support allowance value that characterizes local network support terminal link ability size, also comprises:
Resolve the resource requirement information of the portable terminal that carries in the described handover preparation request message, obtain the current available network resource information of local network, judge whether the current available network resource of local network satisfies the Internet resources of described portable terminal demand.
5, method as claimed in claim 3 is characterized in that, calculates described support allowance value, specifically comprises:
When only comprising the single performance desired value in the resource requirement information of described portable terminal, described single performance desired value according to current described single performance desired value that can provide of local network and described portable terminal demand, calculate both ratio, obtain described support allowance value; Perhaps
When comprising more than one performance index value in the resource requirement information of described portable terminal,, calculate both ratio respectively according to this single performance desired value of current corresponding single performance desired value that can provide of local network and described portable terminal demand; And according to the weight coefficient of each performance index of setting, add up again multiply by the weight coefficient of its corresponding performance index with each ratio that calculates after, with after adding up with value as described support allowance value.
6, method as claimed in claim 5 is characterized in that, before both ratio of described calculating, also comprises:
Resolve the one or more performance index value that comprises in the resource requirement information of described portable terminal; And
The current corresponding performance index value that can provide of local network is provided.
7, the method for claim 1 is characterized in that, also comprises:
Listen to described switching and prepare the target access of response message, stop timing.
8, a kind of access point apparatus is characterized in that, comprising: terminal resource demand information acquisition module, network resource information acquisition module, computing module, time block and sending module;
Described terminal resource demand information acquisition module is used to receive handover preparation request message, resolves the resource requirement information of the portable terminal that carries in the described handover preparation request message;
Described network resource information acquisition module is used to obtain the current available network resource information of local network;
Described computing module, according to the current available network resource information of local network and the resource requirement information of described portable terminal, the computation rule that employing is set calculates the support allowance value that characterizes local network support terminal link ability size, and determines the timing time that is inversely proportional to and concerns with described support allowance value;
Described time block, the timing time that is used for determining according to described computing module carries out timing;
Described sending module is used for when described time block timing time arrives, and the preparation response message is switched in broadcasting.
9, device as claimed in claim 8 is characterized in that, described computing module further comprises: judge submodule, first calculating sub module and second calculating sub module;
Described judgement submodule, the resource requirement information that is used for the described portable terminal that parses according to described terminal resource demand information acquisition module, and the current available network resource information of the local network that obtains of described network resource information acquisition module, judge whether the current available network resource of local network satisfies the Internet resources of described portable terminal demand; When the current available network resource of judging local network can satisfy the Internet resources of described portable terminal demand, notify first calculating sub module; When the current available network resource of judging local network can not satisfy the Internet resources of described portable terminal demand, notify second calculating sub module;
Described first calculating sub module is used for setting and supports that the allowance value is zero, and the timing duration is infinitely great;
Performance index value and the current corresponding performance index value that can provide of local network that resource requirement information according to described portable terminal comprises are provided described second calculating sub module, calculate described support allowance value; And determine with described support allowance value be inversely proportional to the relation timing time.
10, install as claimed in claim 8 or 9, it is characterized in that, also comprise:
Handover module is used for the switching initialization request that mobile terminal receive sends, towards periphery Web broadcast handover preparation request message; And after receiving first switching of returning preparation response message, send the switching initialization response to described portable terminal, indicate described portable terminal to return the target access of switching the preparation response message and switch to first.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013097770A1 (en) * | 2011-12-28 | 2013-07-04 | 华为技术有限公司 | Timing control method and access point for heterogeneous network |
| CN105208674A (en) * | 2015-08-18 | 2015-12-30 | 耿懿超 | Communication method and communication system thereof |
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