CN101656993A - Access point switching method and device - Google Patents
Access point switching method and device Download PDFInfo
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- CN101656993A CN101656993A CN200910177005A CN200910177005A CN101656993A CN 101656993 A CN101656993 A CN 101656993A CN 200910177005 A CN200910177005 A CN 200910177005A CN 200910177005 A CN200910177005 A CN 200910177005A CN 101656993 A CN101656993 A CN 101656993A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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Abstract
The invention discloses access point switching method and device and relates to the technical field of network communications. The invention aims to solve the problem in the prior art that: when a UEexchanges data of a data bypass, if the UE switches the access point, the target access point can not identify the bypass data. The method comprises the following steps: when discovering that a user device in the local access point area needs switching the access point, the source access point transmits a switching message carrying the packet data protocol address of the user device, so that the target access point transmits bypass data to the user device according to the address of the user device after the user device switches to the target access point. By using the method and the device, when the UE exchanges data of the data bypass, the UE bypass service data can be carried out continuously.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of access point handoff technique.
Background technology
At present, subscriber equipment (User Equipment, UE) by access point (Access Point, AP) networking of accessing group data network as shown in Figure 1;
The concrete process that described UE is linked into packet data network is: UE insert successively by eating dishes without rice or wine access point in the subscriber's local network, home gateway (Home Gateway, HGW); Be linked into the IP transmission network by described home gateway HGW again; Then, be linked into security gateway (Security Gateway in the mobile core network successively by the IP transmission network again, SeGW), IAD (Access Gateway, AG), and then with mobile core network in circuit domain (Circuit Switched domain, CS) core net and packet domain (PacketSwitched domain, PS) core net links to each other; At last, UE can (Gateway GPRS Support Node GGSN) obtains information from packet data network by Gateway GPRS Support Node in the PS domain core net.Wherein, described AP is based on fixedly IP transmission network, and the network equipment of wireless access service is provided for the home/business subscriber equipment; Described AP has comprised base station node B and radio network controller, and (AG comprises the RNC agent functionality for Radio NetworkController, function RNC).
Because UE need carry out data interaction by the Gi interface and the Internet of PS domain core net GGSN network element by the Internet in the AP visit packet data network.The flow of UE visit Internet need pass through mobile core network like this, has taken the bandwidth of mobile core network.For this reason, operator has proposed the demand of data bypass, and promptly UE carries out in the local network professional by carrying out the local data exchange in AP and the local network between the IP device (as: PC); Meanwhile, UE can also reduce the flow of mobile core network with this directly by AP visit Internet network, improves the systematic function of mobile core network.GGSN function that described AP is integrated.
The inventor finds to exist at least in the prior art following problem: in the prior art, the technology by bypass data can realize that UE is directly by the Internet in the AP visit packet data network.But UE switches if AP takes place UE in the data exchange process of carrying out data bypass, can make the bypass data of UE interrupt alternately.
Summary of the invention
The embodiment of the invention provides a kind of access point switching method and device, and when carrying out the bypass data information interaction to be implemented in UE, UE AP takes place switches the continuity that still can guarantee the bypass data business.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, the embodiment of the invention provides a kind of access point switching method, comprising:
When the subscriber equipment in this access point of access point discovery zone, source need switch access point,
The switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.
On the other hand, the embodiment of the invention provides a kind of access point switching method, comprising:
Reception carries the handoff request message of the packet data protocol address of described subscriber equipment;
After subscriber equipment switches to this access point zone, send bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.
Again on the one hand, a kind of access point switching device shifter that the embodiment of the invention provides, this device comprises:
Detecting unit, whether the subscriber equipment that is used to detect in this access point zone needs to switch access point;
Message sending unit, be used to send the switching message of the packet data protocol address that carries described subscriber equipment, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.
Again on the one hand, a kind of access point switching device shifter that the embodiment of the invention provides, this device comprises:
The message sink unit is used to receive the handoff request message of the packet data protocol address that carries described subscriber equipment;
Data transmission unit is used for after subscriber equipment switches to this access point zone, sends bypass data according to the packet data protocol address of described subscriber equipment to described subscriber equipment.
A kind of access point switching method and device that the embodiment of the invention provides, by when the subscriber equipment in this access point of access point discovery zone, source need switch access point, the switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.In prior art, user equipment (UE) is in the data exchange process of carrying out data bypass, switch if access point AP takes place UE, then make purpose AP can't discern bypass data, thereby make the mutual problem of interrupting of bypass data of UE compare, the embodiment of the invention is switched by access point, after making that UE switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of UE pass-through service data between AP.
Description of drawings
Fig. 1 is the networking diagram of subscriber equipment by the access point accessing group data network;
A kind of access point switching method flow chart that Fig. 2 provides for the embodiment of the invention;
The another kind of access point switching method flow chart that Fig. 3 provides for the embodiment of the invention;
The structural representation that a kind of access point switching device shifter that Fig. 4 A provides for the embodiment of the invention is the source access point apparatus;
The another kind of access point switching device shifter that Fig. 4 B provides for the embodiment of the invention is a source access point apparatus structural representation;
A kind of access point switching device shifter that Fig. 5 A provides for the embodiment of the invention is a purpose access point apparatus structural representation;
The another kind of access point switching device shifter that Fig. 5 B provides for the embodiment of the invention is a purpose access point apparatus structural representation;
A kind of access point switching method flow chart that Fig. 6 provides for the embodiment of the invention;
The another kind of access point switching method flow chart that Fig. 7 provides for the embodiment of the invention;
The another kind of access point switching method flow chart that Fig. 8 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing a kind of access point switching method and the device that the embodiment of the invention provides is described in detail.
As shown in Figure 2, be a kind of access point switching method that the embodiment of the invention provides, this method, the specific implementation process is as follows:
201: source access point AP finds that the subscriber equipment in this access point zone need switch access point;
202: source access point AP sends the switching message of the packet data protocol address that carries described subscriber equipment, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.
Concrete, the switching message that can be the source access point packet data protocol address that will carry described subscriber equipment sends to IAD, initiate handoff request by IAD to the purpose access point again, carry the packet data protocol address of described subscriber equipment in this request.
Wherein, the packet data protocol address of described subscriber equipment is used for purpose access point identification subscriber equipment.
Described switching message specifically can be divided into the packet data protocol address that two kinds of realization scenes are carried described subscriber equipment:
A kind of for when described source access point and the same subnet in purpose access point position, can realize carrying the packet data protocol address of described subscriber equipment by the cell that increases described switching message.For example: expand the cell that an AP layer 2 switches message, comprise in the cell: the packet data protocol pdp address of to be switched UE.Wherein, the pdp address of described to be switched UE is used for purpose AP identification subscriber equipment.
Another kind of when being same subnet or different sub-network for described source access point and purpose access point, also can realize carrying the packet data protocol address of described subscriber equipment by the cell that increases described switching message.For example: expand the cell that an AP layer 3 switches message, comprise in the cell: the pdp address of to be switched UE.Wherein, the pdp address of described to be switched UE is used for purpose AP and seeks UE.
A kind of access point switching method that the embodiment of the invention provides, by when the subscriber equipment in this access point of access point discovery zone, source need switch access point, the switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
It should be noted that described switching message can also carry the address and the subnet mask of active access point, so that the purpose access point judges according to the address and the subnet mask of described source access point whether described source access point and purpose access point are same subnet; Wherein, the address of described source access point is the IP address of source access point AP.
When described source access point and purpose access point were same subnet, described method can realize that scenes carry out access point and switch by two kinds, is specially:
Scene one is directly as follows by the access point switching flow of purpose access point AP forwarding bypass data:
Source access point AP receives the message that carries switching command, and according to the described switching command that receives, described source access point AP stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment; Wherein, described DHCP is re-rented message and is used for source AP access point and refreshes the lease period of its IP address, thereby guarantees the validity of described IP address; (Address Resolution Protocol, ARP) the request response is used for returning to described transmission ARP requesting users equipment the IP address of described source access point to the address resolution protocol of described subscriber equipment.
Scene two is as follows for the access point switching flow of transmitting bypass data by the bypass data passage of setting up between source access point AP and the purpose access point AP:
Described source access point AP receives the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol pdp address and the purpose access point AP of described user equipment (UE) in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point; Wherein, the mode of setting up of concrete described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
When described source access point and purpose access point were different sub-network, the access point switching flow of described bypass data was as follows:
Source access point AP receives the switching command of access gateway AG transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.Wherein, the mode of setting up of concrete described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
It is also to be noted that, when described switching message is carried the packet data protocol address of active access point address and subscriber equipment, no matter whether described source access point AP and purpose access point AP are same subnet, source access point AP side can adopt the access point switching flow of following bypass data, and its concrete switching flow is as follows:
Source access point AP receives the switching command that access gateway AG sends according to access point address, described source, or, the register request message of the packet data protocol address that carries described subscriber equipment that described purpose access point sends according to access point address, described source and the address of purpose access point;
Described source access point AP sets up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of described purpose access point.Wherein, the mode of setting up of concrete described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
What deserves to be explained is that the promptly mobile IP register request message of the above register request message, this message can carry the address of the packet data protocol address and the purpose access point of described subscriber equipment; Wherein, the packet data protocol address of described subscriber equipment can be the pdp address of to be switched UE; The address of described purpose access point can be the IP address of purpose AP.For example: use home address field in the described mobile IP register request message to carry the pdp address of to be switched UE, the IP address of using care-of address field to carry purpose AP.
As shown in Figure 3, be a kind of access point switching method that the embodiment of the invention provides, this method comprises,
301: the purpose access point receives the handoff request message of the packet data protocol address that carries described subscriber equipment;
Concrete, can be after IAD receives the switching message of the packet data protocol address that carries described subscriber equipment that the source access point sends, send the handoff request message of the packet data protocol address that carries described subscriber equipment again to the purpose access point.
302: after subscriber equipment switched to this access point zone, the purpose access point sent bypass data according to the packet data protocol address of described subscriber equipment to described subscriber equipment.Wherein, the packet data protocol address of described subscriber equipment is used for purpose access point identification subscriber equipment.
A kind of access point switching method that the embodiment of the invention provides receives the handoff request message of the packet data protocol address carry described subscriber equipment by the purpose access point; After subscriber equipment switches to this access point zone, send bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
It should be noted that when described handoff request message is also carried the address of active access point and subnet mask, judge according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet; Wherein, the address of described source access point is the IP address of source access point AP.
When described source access point and purpose access point were same subnet, described method can realize that scenes carry out access point and switch by two kinds, is specially:
Scene one is directly as follows by the access point switching flow of purpose access point AP forwarding bypass data:
After described subscriber equipment is finished switching, purpose access point AP refreshes medium Access Layer address table and address analysis protocol table, so that the medium Access Layer address table of network side entity after according to described refreshing sends to this access point with the bypass data of described subscriber equipment; Wherein, the method that described purpose access point AP refreshes medium Access Layer address table and address analysis protocol table has three kinds, specifically can be described referring to 612 steps among following Fig. 6 embodiment.
Scene two is as follows for the access point switching flow of transmitting bypass data by the bypass data passage of setting up between source access point AP and the purpose access point AP:
Purpose access point AP sends the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point to described source access point AP, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point, transmit thereby make bypass data to carry out bypass data by this bypass data passage.
When described source access point and purpose access point were different sub-network, the access point switching flow of described bypass data was as follows:
Purpose access point AP sends the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.Wherein, the mode of setting up of described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
It is also to be noted that, when described switching message carry active access point address and and during the packet data protocol address of subscriber equipment, no matter whether described source access point AP and purpose access point AP are same subnet, purpose access point AP side can adopt the access point switching flow of following bypass data, and its concrete switching flow is as follows:
Purpose access point AP sends the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.
What deserves to be explained is that the promptly mobile IP register request message of the above register request message, this message can carry the address of the packet data protocol address and the purpose access point of described subscriber equipment; Wherein, the packet data protocol address of described subscriber equipment can be the pdp address of to be switched UE; The address of described purpose access point can be the IP address of purpose AP.For example: use home address field in the described mobile IP register request message to carry the pdp address of to be switched UE, the IP address of using care-of address field to carry purpose AP.
Shown in Fig. 4 A, be a kind of access point switching device shifter that the embodiment of the invention provides, the access point switching device shifter can be the source access point apparatus, this device comprises,
Detecting unit 401, whether the subscriber equipment that is used to detect in this access point zone needs to switch access point;
It should be noted that described switching message can also carry the address and the subnet mask of active access point, so that the purpose access point judges according to the address and the subnet mask of described source access point whether described source access point and purpose access point are same subnet; Wherein, the address of described source access point is the IP address of source access point AP.
When described source access point and purpose access point are same subnet, can realize that scenes carry out access point and switch by two kinds:
Scene one is the access point switching of directly transmitting bypass data by purpose access point AP, and shown in Fig. 4 B, this device can also comprise:
First message processing unit 403 is used to receive the message that carries switching command, according to the described switching command that receives, stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment; Wherein, described DHCP is re-rented message and is used for source AP access point and refreshes the lease period of its IP address, thereby guarantees the validity of described IP address; The arp request response of described subscriber equipment is used for returning to described transmission ARP requesting users equipment the IP address of described source access point.
Scene two is switched for the access point of transmitting bypass data by the bypass data passage of setting up between source access point AP and the purpose access point AP, and this device can comprise:
Second message processing unit 404, be used to receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point; Wherein, the mode of setting up of concrete described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
It is also to be noted that, when no matter whether described source access point and purpose access point be same subnet, and when described switching message was carried the packet data protocol address of active access point address and subscriber equipment, the access point switching device shifter of described bypass data can carry out Message Processing by described second message processing unit;
Described second message processing unit 404, also be used to receive the switching command of access gateway AG transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.Wherein, the mode of setting up of concrete described bypass data passage has five kinds, specifically can be referring to the description of step 709 as shown in Figure 7.
First message processing unit 403 can exist simultaneously with second message processing unit 404, also can separately exist in the access point switching device shifter.
A kind of access point switching device shifter that the embodiment of the invention provides, by when the subscriber equipment in this access point of access point discovery zone, source need switch access point, the switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
Shown in Fig. 5 A, be the another kind of access point switching device shifter that the embodiment of the invention provides, the access point switching device shifter can be the purpose access point apparatus, this device comprises,
It should be noted that when described handoff request message is also carried the address of active access point and subnet mask, judge according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet; Wherein, the address of described source access point is the IP address of source access point AP.
When described source access point and purpose access point were same subnet, described method can realize that scenes carry out access point and switch by two kinds, is specially:
Scene one is that this device can also comprise when directly transmitting the access point switching of bypass data by purpose access point AP:
Judging unit 503 is used for judging according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet when described handoff request message is also carried the address of active access point and subnet mask;
Scene two is switched for the access point of transmitting bypass data by the bypass data passage of setting up between source access point AP and the purpose access point AP, and this device can also comprise:
It should be noted that, above-described judging unit 503, refresh unit 504 and message sending unit 505 can exist simultaneously, also can be that described judging unit 503 and message sending unit 505 exist simultaneously, this moment, message sending unit 505 was carried out above-mentioned action when judging that when judging unit 503 source access point and purpose access point do not belong to same subnet; Perhaps can also be that described message sending unit 505 separately exists in the access point switching device shifter; Do not need to judge whether source access point and purpose access point belong to same subnet this moment, directly carries out above-mentioned action by message sending unit 505.
It is also to be noted that, when described switching message carry active access point address and and during the packet data protocol address of subscriber equipment, no matter whether described source access point AP and purpose access point AP are same subnet, source access point AP side can adopt the access point of following bypass data to switch, this device can adopt described message sending unit equally, be used for sending the register request message of the address information of the packet data protocol address carry described subscriber equipment and this access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point to described source access point.
A kind of access point switching device shifter that the embodiment of the invention provides receives the handoff request message of the packet data protocol address carry described subscriber equipment by the purpose access point; After subscriber equipment switches to this access point zone, send bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
As shown in Figure 6, be a kind of access point switching method that the embodiment of the invention provides, its concrete realization flow is:
601, when source access point AP finds that subscriber equipment in this access point zone need switch access point, source AP sends packet data protocol (the Packet Data Protocol that carries to be switched UE, PDP) the switching message of the address of address, source AP and subnet mask is to AG, and request is switched.
602, after AG receives that access point switches message, according to the sub-district ID of purpose AP, send handoff request message to purpose AP, request purpose AP is that described UE distributes related resource.Wherein, carry the pdp address of to be switched UE, address and the subnet mask of source AP in the described handoff request message.Described purpose AP can judge that described source AP and purpose AP belong to same subnet according to address and the subnet mask of the source AP that carries in the described handoff request message; Pdp address identification subscriber equipment according to the to be switched UE that carries in the described handoff request message.
603, after purpose AP received handoff request message, described purpose AP can judge that described source AP and purpose AP belong to same subnet according to address and the subnet mask of the source AP that carries in the described handoff request message; According to the pdp address identification subscriber equipment of the to be switched UE that carries in the described handoff request message, and be that described UE distributes related resource and sets up Radio Link.
It should be noted that, if described purpose AP judges described source AP and belongs to same subnet with it, then the switching between purpose AP and the source AP can also be carried out the transmission of bypass data by setting up the bypass data passage, and concrete realization flow can be referring to following Fig. 7 and switching flow shown in Figure 8.
604, purpose AP returns handoff request acknowledgment message and gives AG.
605, after AG receives handoff request acknowledgment message, send and carry the message of switching command to source AP.
606, after source AP receives the message that carries switching command, stop downlink data and send, and send radio bearer reconfiguration message to UE.Wherein, described radio bearer reconfiguration message is used to indicate UE and purpose AP to set up Radio Link, so that switch.
607, after source AP finished radio bearer and reshuffles, (DynamicHost Configuration Protocol DHCP) re-rented message DHCP Request and stop to respond ARP request at this UE to stop to send DHCP.Wherein, described DHCP is re-rented message and is used for source AP access point and refreshes the lease period of its IP address, thereby guarantees the validity of described IP address; (Address Resolution Protocol, ARP) the request response is used for returning to described transmission ARP requesting users equipment the IP address of described source access point to the address resolution protocol of described subscriber equipment.Wherein, describedly stop to send DHCP Request message and stop to respond the ARP request message, can stop medium Access Layer (MediaAccess Control to AP institute connection device, MAC) renewal of address table and ARP table, after purpose AP refreshes MAC, ARP table like this, can do not changeed back again by source AP, after AP switched like this, downlink message can be forwarded to purpose AP.
608, UE and purpose AP carry out air interface synchronization, set up the link of eating dishes without rice or wine.
609, after the air interface synchronization, purpose AP sends switching detection message to AG.
610, UE transmission radio bearer is reshuffled and is finished message to purpose AP.
611, purpose AP receive radio bearer reshuffle finish message after, beginning transceive data, and send handoff completion message to AG, AG begins to issue data and gives purpose AP.
612, purpose AP is after sending handoff completion message, judge the address of described source AP and subnet mask whether with purpose AP at same subnet; When described source AP and purpose AP belonged to same subnet, purpose AP sent the DHCP request message of the source MAC that carries UE to Dynamic Host Configuration Protocol server (DHCP SERVER); The MAC that this DHCP request message is used to refresh two-layer equipment transmits with ARP and shows; After AP switches, transmit the table with ARP according to the described MAC that refreshes like this, downlink message can be forwarded to purpose AP.When subnet is different, do not deal with.Wherein, to transmit be a two-layer retransmitting table based on port to described MAC.Ethernet switch is transmitted the forwarding port numbers that obtains two layer message by searching MAC, thereby realizes the quick forwarding of two layer message.The list item that MAC transmits mainly comprises: the VLAN ID under target MAC (Media Access Control) address, the port, forwarding port numbers.Described ARP table record has the MAC Address of main frame and the corresponding relation of IP address.Concrete refresh that purpose AP connects the mac address table of equipment in the local area network (LAN) and method that ARP shows is as follows:
Method 1: use the source MAC encapsulation DHCP request message of UE, issue Dynamic Host Configuration Protocol server.The purpose MAC of message is broadcasting MAC, after the equipment in the local area network (LAN) is received the DHCP request message, refreshes AP and connects in the local area network (LAN) MAC of equipment and transmit with ARP and show.
Method 2: use gratuitous ARP mechanism, purpose AP is to connection local area network (LAN) transmission gratuitous ARP packet, refreshes in the local area network (LAN) MAC of equipment and transmits with ARP and show.Gratuitous ARP packet is a kind of special ARP message, and sender IP address of carrying in this message and purpose IP address all are this machine IP addresses, and sender's MAC Address is this machine MAC Address, and target MAC (Media Access Control) address is a broadcast address.By external transmission gratuitous ARP packet, can realize following function: equipment has changed hardware address, notifies other renewal of the equipment ARP list item and MAC to transmit by sending gratuitous ARP packet.For the gratuitous ARP packet of receiving,, just the information of carrying in the gratuitous ARP packet is added in self ARP mapping list, and renewal MAC transmits if not have the ARP list item of message correspondence therewith in the ARP table.
Method 3: send the broadcast arp request message.Wrap when lan device receives this ARP, the ARP table and the MAC that so just upgrade self transmit.
613, for the PS numeric field data flow of visit core net, UE receives and dispatches by AG and purpose AP, no longer through source AP.
614, for bypass data, UE receives and dispatches by purpose AP, no longer through source AP.
615, AG send carry the resource release command message to source AP, notification source AP discharges respective resources.
616, source AP discharges the UE respective resources.
617, source AP sends Release complete to AG, finishes the access point switching flow.
A kind of access point switching method that the embodiment of the invention provides carries the pdp address of to be switched UE, the address of source AP and the handoff request message of subnet mask by the reception of purpose access point; Purpose AP can judge whether described source AP and purpose AP belong to same subnet according to address and the subnet mask of described source AP, thereby carrying out access point switches, thereby after making that subscriber equipment switches to this access point zone, purpose AP directly sends bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose access point can directly send bypass data to described subscriber equipment according to the address of described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
As shown in Figure 7, be a kind of access point switching method that the embodiment of the invention provides, its concrete realization flow is:
701, when source access point AP finds that subscriber equipment in this access point zone need switch access point, source AP sends the switching message of address of the pdp address that carries to be switched UE and source AP to AG, and request is switched.
702, after AG received that access point switches message, according to the sub-district ID of purpose AP, the handoff request message of address that sends the pdp address that carries to be switched UE and source AP was to purpose AP, and request purpose AP is that described UE distributes relevant resource.Wherein, discern subscriber equipment according to the pdp address of the to be switched UE that carries in the described handoff request message; The address of described source AP is used for setting up the bypass data passage with described purpose AP.
703, after purpose AP received handoff request message, purpose AP was that described UE distributes related resource and sets up Radio Link.
704, purpose AP returns handoff request acknowledgment message and gives AG.
705, purpose AP is according to the IP address of the source AP that obtains from step 702, and purpose AP sends mobile IP register request message to source AP; Wherein, comprise the IP address of purpose AP and the pdp address of described to be switched UE in the described mobile IP register request message.For example: use home address field in the described mobile IP register request message to carry the pdp address of to be switched UE, the IP address of using care-of address field to carry purpose AP.
706, after source AP receives mobile IP register request message, preserve the IP address of purpose AP and the pdp address of to be switched UE, send mobile IP enrollment response message to purpose AP then.
707, after AG receives handoff request acknowledgment message, send and carry the message of switching command to source AP.
708, after source AP receives the message that carries switching command, stop downlink data and send, send radio bearer reconfiguration message to UE.
709, source AP sets up the bypass data passage with purpose AP according to purpose AP submitted IP address.The described bypass data passage of setting up can adopt GPRS Tunnel Protocol to realize, can also realize by the tunnel of mobile IP, can also realize by the Iur interface between source AP and the purpose AP, can also be by the Radio Link of eating dishes without rice or wine to set up between source AP and the purpose AP; Wherein, Radio Link is set up in described control can pass through Wireless Fidelity (Wireless Fidelity, Wi-Fi) technology is finished, and is all integrated Wi-Fi function of source AP and purpose AP, just can carry out bypass data communication by the Wi-Fi Radio Link between source AP and the purpose AP like this.The described specific implementation of setting up the bypass data passage can be as follows:
Mode one: use ipsec tunnel to realize, set up ipsec tunnel between source AP and the purpose AP.
Mode two: can adopt GPRS Tunnel Protocol to realize, for example: in the WCDMA system, GPRS Tunnel Protocol is applied between SGSN and the GGSN, between SGSN and the RNC, set up the passage that packet transmits, because RNC function that AP is integrated, itself just supports GPRS Tunnel Protocol, so can utilize the existing GPRS Tunnel Protocol of having supported to set up the bypass flow passage between source AP and purpose.
Mode three: can adopt the tunnel of mobile IP to realize, for example: IPinIP (the IP encapsulation in the IP) is placed on an IP bag in the payload of a new IP bag; Minimum encapsulation in the IP is that the simplification of IPinIP realizes, removed the redundancy section of the header of internal layer IP header and outer IP among the IPinIP; GRE (GenericRoutingEncapsulation, Generic Routing Encapsulation) is encapsulated into 3 layers of message in the IP message, delivers to the technology of untiing behind the opposite end, tunnel; The UDP tunnel encapsulation is encapsulated in the IP message in the UDP message to be transmitted.Like this, can use top technology between source AP and the purpose AP and set up the bypass flow tunnel.
Mode four: realize by the Iur interface between source AP and the purpose AP: the Iur interface is the interface between the RNC, and RNC function that AP is integrated is so can use the Iur interface to communicate between AP.
Mode five: by the Radio Link of eating dishes without rice or wine to set up between source AP and the purpose AP, for example: all integrated Wi-Fi function of source AP and purpose AP, use Wi-Fi to communicate then between them.
710, UE and purpose AP carry out air interface synchronization, set up the link of eating dishes without rice or wine.
711, after the air interface synchronization, purpose AP sends switching detection message to AG.
712, UE transmission radio bearer is reshuffled and is finished message to purpose AP.
713, purpose AP receive radio bearer reshuffle finish message after, beginning transceive data, and send handoff completion message to AG, AG begins to issue data and gives purpose AP.
714, for the PS numeric field data flow of visit core net, UE receives and dispatches by purpose AP, no longer through source AP.
715, for the bypass data of down direction, the arrival source AP of bypass data elder generation from network side is transmitted to purpose AP by source AP then, is transmitted to UE by purpose AP again.
716,,, after purpose AP distinguishes bypass data, two kinds of processing methods are arranged from the uplink message of the UE AP that achieves the goal earlier for the bypass data of up direction: first kind, bypass data is transmitted to source AP, by source AP bypass data is transmitted to network side then; Second kind, with the direct transmission network side of bypass data, without source AP.
717, AG sends and carries the resource release command message to source AP, and notification source AP discharges corresponding resource.
718, source AP discharges the corresponding resource of UE.
719, source AP sends Release complete to AG, finishes switching flow.
As shown in Figure 8, be a kind of access point switching method that the embodiment of the invention provides, its concrete realization flow is:
801-804 is identical with above-mentioned steps 801-804, repeats no more herein.
805:AG sends the message that carries switching command; Wherein, the message of described switching command also carries the IP address of purpose AP and the pdp address of to be switched UE.
806-817 is identical with above-mentioned steps 708-719, repeats no more herein.
What deserves to be explained is that the described access point switching method of above Fig. 7 and Fig. 8 is not only applicable to the scene that purpose access point and source access point belong to same subnet, is applicable to that also purpose access point and source access point belong to the scene of different sub-network.
A kind of access point switching method that the embodiment of the invention provides receives the handoff request message of the address of the pdp address carry to be switched UE, source AP by the purpose access point; Purpose AP can set up the bypass data passage according to address and the described source AP of described source AP, thereby after making that subscriber equipment switches to this access point zone, purpose AP sends bypass data by the bypass data passage of described foundation to described subscriber equipment.Compared with prior art, the embodiment of the invention is switched by access point, after making that described subscriber equipment switches to the purpose access point, described purpose AP sends bypass data by the bypass data passage of described foundation to described subscriber equipment, guaranteed in the process that subscriber equipment switches the continuity of subscriber equipment pass-through service data between a plurality of access points.
Through the above description of the embodiments, one of ordinary skill in the art will appreciate that: realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise step as above-mentioned method embodiment, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, 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 claim.
Claims (10)
1, a kind of access point switching method is characterized in that, comprising:
When the subscriber equipment in this access point of access point discovery zone, source need switch access point,
The switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.
2, access point switching method according to claim 1, it is characterized in that, described switching message is also carried the address and the subnet mask of active access point, so that the purpose access point judges according to the address and the subnet mask of described source access point whether described source access point and purpose access point are same subnet;
When described source access point and purpose access point were same subnet, described method also comprised:
Reception carries the message of switching command, according to the described switching command that receives, stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment;
Perhaps, receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point;
When described source access point and purpose access point are different sub-network, described method also comprises: receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.
3, access point switching method according to claim 1 is characterized in that, when described switching message was also carried active access point address, described method also comprised:
Receive the switching command that IAD sends according to access point address, described source, or, the register request message of the packet data protocol address that carries described subscriber equipment that described purpose access point sends according to access point address, described source and the address of purpose access point;
Set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of described purpose access point.
4, a kind of access point switching method is characterized in that, comprising:
Reception carries the handoff request message of the packet data protocol address of described subscriber equipment;
After subscriber equipment switches to this access point zone, send bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.
5, access point switching method according to claim 4, it is characterized in that, when described handoff request message is also carried the address of active access point and subnet mask, judge according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet;
When being same subnet, after described subscriber equipment is finished switching, refresh medium Access Layer address table and address analysis protocol table, so that the medium Access Layer address table of network side entity after according to described refreshing sends to this access point with the bypass data of described subscriber equipment, perhaps, send the register request message of the address information of the packet data protocol address carry described subscriber equipment and this access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point;
When being different sub-network, send the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.
6, access point switching method according to claim 4 is characterized in that, when described switching message is also carried active access point address, comprising:
Send the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.
7, a kind of access point switching device shifter is characterized in that, comprising:
Detecting unit, whether the subscriber equipment that is used to detect in this access point zone needs to switch access point;
Message sending unit, be used to send the switching message of the packet data protocol address that carries described subscriber equipment, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.
8, access point switching device shifter according to claim 7 is characterized in that, described device also comprises:
First message processing unit is used to receive the message that carries switching command, according to the described switching command that receives, stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment; And/or,
Second message processing unit, be used to receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.
9, a kind of access point switching device shifter is characterized in that, comprising:
The message sink unit is used to receive the handoff request message of the packet data protocol address that carries described subscriber equipment;
Data transmission unit is used for after subscriber equipment switches to this access point zone, sends bypass data according to the packet data protocol address of described subscriber equipment to described subscriber equipment.
10, access point switching device shifter according to claim 9 is characterized in that, this device also comprises:
Judging unit is used for judging according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet when described handoff request message is also carried the address of active access point and subnet mask;
Refresh unit, be used for when described judgment unit judges is same subnet, after described subscriber equipment is finished switching, refresh medium Access Layer address table and address analysis protocol table, so that the medium Access Layer address table of network side entity after according to described refreshing sends to this access point with the bypass data of described subscriber equipment; And/or,
Message sending unit, be used for sending the register request message of the address information of the packet data protocol address carry described subscriber equipment and this access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point to described source access point.
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| CN200910177005A CN101656993A (en) | 2009-09-16 | 2009-09-16 | Access point switching method and device |
| PCT/CN2010/076975 WO2011032499A1 (en) | 2009-09-16 | 2010-09-16 | Access point switching method and device |
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| CN200910177005A CN101656993A (en) | 2009-09-16 | 2009-09-16 | Access point switching method and device |
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