CN1937632A - Address distributing method for broadband wireless access system - Google Patents
Address distributing method for broadband wireless access system Download PDFInfo
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- CN1937632A CN1937632A CN 200510037586 CN200510037586A CN1937632A CN 1937632 A CN1937632 A CN 1937632A CN 200510037586 CN200510037586 CN 200510037586 CN 200510037586 A CN200510037586 A CN 200510037586A CN 1937632 A CN1937632 A CN 1937632A
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Abstract
The invention provides an address allocating method for wideband wireless access system, comprising the steps of: when connecting to network, mobile terminal sends user/equipment authentication request to AAA (Authentication,Authorization and Accounting) server; after the authorization succeeds, the mobile terminal sends registering request to access gateway; the mobile terminal completes registering, the access gateway obtains mobile terminal-supported IP address allocating mode according to the user configuration information returned after the authorization succeeds; the access gateway replaces the mobile terminal as DHCP Client to send IP address allocating request to DHCP server or does not request IP address but waits for the mobile terminal to actively request IP address; the DHCP server allocates IP address to corresponding MAC address, the access gateway transfers the allocated IP address to the mobile terminal and the mobile terminal completes local address binding. And it reduces implementing difficulty and cost, reduces system overhead and speeds up switching.
Description
Technical field
The present invention relates to BWA, particularly relate to the IP address assignment method in the BWA.
Background technology
In present BWA, as MSS (Mobile Subscriber Station, portable terminal) initial access network the time, system is usually by DHCP (Dynamic Host ConfigurationProtocol, DHCP) is portable terminal distributing IP address, move dhcp client on the mobile terminal MS S in the application IP addresses process, IAD is as the mutual message of DHCP between DHCP Relay relaying MSS and the DHCP Server.But the DHCP agreement is the procotol that is used for cable network that IETF proposes originally, has more problem if directly use in wireless network environment.Use broadcasting packet to carry out the distribution and the checking of IP address as DHCP, this also is not suitable for the wireless network of air bandwidth scarcity of resources; IAD can't well be monitored the presence of MSS as DHCP Relay in addition, the distribution of also uncontrollable IP address.
Summary of the invention
It is the method for portable terminal distributing IP address by the DHCP agreement in BWA that purpose of the present invention just provides a kind of, solves address assignment exists in the present broadband wireless network interface-free resources and takies more, switch speed and wait problem slowly.
The invention provides a kind of address distribution method that is applied to BWA, described BWA comprises a portable terminal, a base station, an IAD, an authentication and authorization charging server and a Dynamic Host Configuration Protocol server at least, and this method specifically comprises the steps:
Step 1: during connection of mobile terminal into network, initiate user/device authentication request to authentication and authorization charging server;
Step 2: after the authentication success, portable terminal is initiated register requirement to IAD;
Step 3: portable terminal is finished registration, and IAD obtains the IP address assignment mode that portable terminal is supported according to the user configuration information that returns after the portable terminal authentication success:
If portable terminal is supported the IP address assignment that IAD is initiated, then IAD replaces portable terminal to initiate the IP address assignment request to Dynamic Host Configuration Protocol server as DHCP Client;
If portable terminal is not supported the IP address assignment that IAD is initiated, then IAD is not asked the IP address, waits standby communication terminal active request IP address;
Corresponding MAC Address is given in step 4:DHCP Server distributing IP address, and IAD is transmitted IP address allocated and given portable terminal, and portable terminal is finished the local address binding.
Said method also comprises step 5: when the IP address rental period arrived, IAD was initiated DHCP and is refreshed (DHCP Renew) process, to the IP address rental period that DHCP Server please look for novelty; DHCP Server refreshes the return address result and gives IAD:
If the IP address is no longer valid, the binding relationship of IAD deletion IP address and MAC Address, no longer the message of this IP address of route sends a notification message simultaneously to portable terminal;
If the IP address is effective, IAD upgrades the address rental period of local maintenance, but does not need to send a notification message to portable terminal.
Said method also comprises the steps 6: when portable terminal shut down or rolls off the production line, the request IAD discharged the IP address; IAD is initiated DHCP release request, and DHCP Server discharges the IP address, deletes the route binding information of IP address and MAC simultaneously, and IAD is the message of this IP address of route no longer.
When portable terminal was supported the IP address assignment of IAD initiation in the said method step 3, IAD was initiated IP address assignment request mode and is specifically comprised the steps:
Step 401: IAD replaces portable terminal to ask the IP address as dhcp client to DHCP Server, and wherein the MAC Address in the DHCP negotiation packet is the MAC Address of portable terminal;
IAD is given in step 402:DHCP server-assignment IP address, IAD is according to the mac address information that carries in the DHCP message, index the corresponding mobile terminal, then IP address allocated is transmitted to portable terminal, and finish the routing iinformation binding of IP address and MAC;
Step 403: portable terminal obtains the IP address, finishes the local address binding.
When portable terminal was not supported the IP address assignment of IAD initiation in the said method step 3, the IP Address requests mode that portable terminal is initiated specifically comprised the steps:
Step 501: portable terminal is initiated IP application request to IAD, asks to be its distributing IP address;
Step 502: IAD judges whether to support the IP address assignment that portable terminal is initiated according to user configuration information, if allow, then as dhcp client to Dynamic Host Configuration Protocol server request IP address;
Step 503:DHCP server returns IP address allocated, and IAD is transmitted the IP address and given portable terminal, finishes the routing iinformation binding of IP address and MAC Address simultaneously.
IAD is incidentally transmitted the distributing IP address to portable terminal by authentication message in the said method step 4, perhaps transmits the distributing IP address by IP address notification message (IPAddr Notify) to portable terminal.
Adopt the method for the invention and device, because employing is simpler, the framework of loose coupling helps the function expansion of IAD.Compared with prior art, therefore MSS realizes that difficulty is littler owing to do not need to realize the dhcp client function, has reduced cost, more is applicable to the environment of mobile terminal resource poorness; And because MSS does not need to handle the Signalling exchange of DHCP, overhead is also littler, has saved rare interface-free resources; Because IAD is initiated IP address assignment, when MSS spans into the gateway switching, do not need MSS to use DHCP distributing IP address, accelerated switch speed; In addition, IAD is directly mutual, simpler in realization with DHCP Server as dhcp client, and the maintenance of routing iinformation is also convenient/and effective; Simultaneously, owing to adopted centralized address allocation policy, IAD can well control the distribution/filtration of IP address, and the online situation of monitoring MSS, help more accurate charging, and can carry out networking planning by mechanism more flexibly between the IAD.
Description of drawings
Fig. 1 is the non-roaming system configuration schematic diagram of BWA that the present invention relates to.
Fig. 2 is the roaming system structural representation of the BWA that the present invention relates to.
Fig. 3 is an address distribution method schematic diagram in the BWA that the present invention relates to;
Fig. 4 is IAD of the present invention example of interacting message schematic diagram when initiating IP address assignment.
Fig. 5 is IAD of the present invention another example of interacting message schematic diagram when initiating IP address assignment.
Fig. 6 be MSS of the present invention initiate IP address assignment the time example of interacting message schematic diagram.
Fig. 7 is an IP address flush interacting message schematic diagram of the present invention.
Fig. 8 is the mutual schematic diagram of IP of the present invention address release message.
Embodiment
Specifically, realized the IP address assignment that IAD is initiated among the present invention, when the portable terminal initial access network, finish equipment and subscription authentication, broad access network gate is as DHCP proxy, operation DHCP Client obtains the IP address for portable terminal from DHCP Server, by notification message IP address allocated is sent to portable terminal then.
At least comprise a user terminal (MSS), a base station (BS), an IAD, an aaa server and a DHCP Server in the described BWA of the present invention.As shown in Figure 1 and Figure 2.Fig. 1 has shown in non-roaming, described BWA framework.This system comprises IAD 100, portable terminal 101, dhcp client 102, DHCP Server 103, AAA (AuthenticationAuthorization Accounting Server authentication and authorization charging server) client 104, aaa server 105.Fig. 2 has shown in roaming, described BWA framework.This system comprises IAD 200, portable terminal 201, dhcp client 202, DHCP Server203, AAA client 204, visit ground aaa server 205, ownership place aaa server 206.
Fig. 3 has shown that IAD can support in the prior art MSS of band dhcp client and the MSS of employing dhcp client agent way as suggested in the present invention simultaneously.301 expressions MSS access network as suggested in the present invention, obtain the IP address by the dhcp client agent way, the common IP address assignment mode of 302 expressions, the resident dhcp client of MSS, IAD is finished the distribution of IP address as the DHCP message between DHCP relay forwarding MSS and the DHCP Server.
Method of the present invention specifically comprises the steps:
One, in the time of the MSS initial access network, perhaps re-accessing network the time, initiates user/device authentication request to authentication and authorization charging server;
Two, after user/device authentication success, MSS initiates register requirement to IAD;
Three, portable terminal is finished registration, and IAD is according to the user configuration information that returns after the portable terminal authentication success, and as Profile information, when decision initiates the Address requests of DHCP in which way.Here introduce dual mode.
First kind: the IP address assignment that IAD is initiated is divided into two kinds of situations of Fig. 4 and Fig. 5 again.
(1) IAD judges according to the user profile that AAA Server (Authentication Authorization AccountingServer authentication and authorization charging server) returns whether it supports the dhcp client agent functionality, if support, then IAD replaces portable terminal to ask the IP address as dhcp client to DHCP Server, and wherein the MAC Address in the DHCP negotiation packet is the MAC Address of MSS.
(2) access network is given in DHCP Server distributing IP address, access network is according to the mac address information that carries in the DHCP message, index corresponding M SS, then IP address allocated is transmitted to MSS (by authentication response message (Auth Ack message) incidentally or notification message), and finish the routing iinformation binding of IP address and MAC.
(3) MSS obtains the IP address, finishes the local address binding.
Fig. 4 shows the mode of returning IP address by authentication responses message.IAD is not to send authentication responses to portable terminal after by authentication 401, but 402 annotates and after DHCP consults IP address assignment (403-406) and finish, send authentication responses message again to MSS by the time at once, in the authentication message incidentally the IP address.
Fig. 5 has shown by the mode of IP notification message transmission IP address to MSS.IAD is after authentication operations 501 successes, return authentication responses message 502 immediately and give MSS, MSS finishes log-on operation 503 then, initiate IP request flow process by IAD as the dhcp client agency again, obtain the IP address from DHCP Server, this comprises the operating process of 504-507, after IAD obtains the IP address, by notification message the IP address is sent to MSS by 508 again.
Second kind: the IP address assignment that MSS initiates, as shown in Figure 6.
(1) MSS initial access network, initial application IP address, authentication/succeed in registration back or the MSS that has obtained the IP address wish to obtain again new IP address, and MSS can initiate IP application request to IAD, and request is its distributing IP address again.
(2) if IAD allows the application IP addresses of MSS, then ask the IP address to DHCP Server as dhcp client.
(3) DHCP Server returns IP address allocated, and IAD is transmitted the IP address and given MSS, finishes the routing iinformation binding of IP address and MAC Address simultaneously.
Fig. 6 has shown the IP address assignment flow process that MSS initiates.MSS can refuse IAD and be its IP address allocated, the request deallocation.601 MSS send IP Configuration message to IAD, wherein have the new field, and IP is redistributed in request.IAD receives the request of MSS, initiates the DHCP flow process, and to DHCP Server request IP address, this comprises operation, asks for an interview 602-605.After IAD obtains the IP address, tell MSS by 606 IPAddr Notify message.
In addition, this method also comprises the steps.Overtime when the rental period of IP address, IAD is initiated the renewal that refreshes of DHCP, if DHCP Server returns the response of refusal, and IAD notice MSS, MSS does not re-use this IP and sends data; If DHCP Server agrees to re-rent, IAD does not need to notify MSS, and MSS continues to use this IP.When MSS rolls off the production line, initiate the release request of IP address, IAD is received the request of MSS, initiates the release flow process of DHCP, discharges IP.
Fig. 7 has shown IP address flush flow process.Overtime when the IP address rental period, IAD is as the dhcp client request DHCP Server refresh address rental period.IAD sends DHCP Request request in 701, and in the rental period that request DHCP Server refreshes the IP address, DHCP Server returns response to renewing a contract by 702 DHCP Ack.If DHCP Server echo reply message shows that the IP address of MSS is no longer valid, then send IPAddr Notify message informing MSS by 703; If also effectively, then do not send a notification message to MSS, indication refreshes the IP address rental period timer of local maintenance.
Fig. 8 has shown that the MSS request address discharges flow process.When MSS shuts down or rolls off the production line, or BS request IAD is when discharging the IP address, the IP Configuration message that sends band Release field is to IAD (operation 801), IAD receives the release request of base station side, send DHCP and discharge request to DHCPServer release IP address (operation 802), and removing the IP address route (the route binding information of deletion IP address and MAC) and the timer information of local maintenance, release IP need not notify MSS behind the address.
Some dhcp message explanations that above relate to:
DHCP discover is a dhcp discover message; DHCP offer is the DHCP assignment messages; DHCPRequest is the DHCP request message; DHCP Ack is a dhcp response message.
Wherein, part message primitive is defined as follows shown in the table:
| Primitive | From → to | Message content | The message explanation |
| IP address notification message (IPAddr Notify) | IAD → MSS | MSS ID, the IP address | The message of notice MSS behind the IAD distributing IP address |
| IP Configuration Request (IP address configuration request message) | MSS → IAD | MSSID，IP?Address， Action(Release， New) | MSS request IAD discharges and redistributes the message of IP address |
| Authentication response message (Auth Ack) | Authentication server → IAD | Increase and whether support DHCP Client Agent mark | Returning in the authentication success message at AAA increases user profile to support the dhcp client agent way |
In the assigning process of entire I P address of the present invention, portable terminal does not need to participate in the reciprocal process of DHCP, and portable terminal does not need to send broadcasting packet (the ARP broadcasting packet that dhcp broadcast message and IP Address Confirmation send), has therefore saved the bandwidth of air-interface resource; In handoff procedure, can accelerate switch speed by the address allocation scheme that IAD triggers; And adopt the mode of this loose coupling, IAD is mutual as the DHCPClient and the DHCP Server of standard, safeguard the binding of IP address and portable terminal MAC Address, help safeguarding the routing iinformation of portable terminal so more, realize route MSS at IAD; In addition, the distribution of IAD centralized management IP address, when having avoided IAD as DHCP Relay, portable terminal may be walked around IAD and directly mutual with DHCP Server and the hidden danger secure context that exists is strengthened the distribution of IP address and controlled.Equally, IAD is directly mutual with DHCP Server as dhcp client in the centralized system, has reduced the quantity of dhcp client, can safeguard authentication information still less when realizing the safe DHCP of support (rfc3118).
Claims (7)
1, a kind of address distribution method that is applied to BWA, described BWA comprises a portable terminal, a base station, an IAD, an authentication and authorization charging server and a Dynamic Host Configuration Protocol server at least, it is characterized in that comprising the steps:
Step 1: during connection of mobile terminal into network, initiate user/device authentication request to authentication and authorization charging server;
Step 2: after the authentication success, portable terminal is initiated register requirement to IAD;
Step 3: portable terminal is finished registration, and IAD obtains the IP address assignment mode that portable terminal is supported according to the user configuration information that returns after the portable terminal authentication success:
If portable terminal is supported the IP address assignment that IAD is initiated, then IAD replaces portable terminal to initiate the IP address assignment request to Dynamic Host Configuration Protocol server as DHCP Client;
If portable terminal is not supported the IP address assignment that IAD is initiated, then IAD is not asked the IP address, waits standby communication terminal active request IP address;
Corresponding MAC Address is given in step 4:DHCP Server distributing IP address, and IAD is transmitted IP address allocated and given portable terminal, and portable terminal is finished the local address binding.
2, method according to claim 1 is characterized in that, also comprises step 5: when the IP address rental period arrived, IAD was initiated the DHCP refresh process, to the IP address rental period that DHCP Server please look for novelty; DHCP Server refreshes the return address result and gives IAD:
If the IP address is no longer valid, the binding relationship of IAD deletion IP address and MAC Address, no longer the message of this IP address of route sends a notification message simultaneously to portable terminal;
If the IP address is effective, IAD upgrades the address rental period of local maintenance, but does not need to send a notification message to portable terminal.
3, method according to claim 1 is characterized in that, also comprises the steps 6: when portable terminal shut down or rolls off the production line, the request IAD discharged the IP address; IAD is initiated DHCP release request, and DHCP Server discharges the IP address, deletes the route binding information of IP address and MAC simultaneously, and IAD is the message of this IP address of route no longer.
According to claim 2 or 3 described methods, it is characterized in that 4, when portable terminal was supported the IP address assignment of IAD initiation in the step 3, IAD was initiated IP address assignment request mode and specifically comprised the steps:
Step 401: IAD replaces portable terminal to ask the IP address as dhcp client to DHCP Server, and wherein the MAC Address in the DHCP negotiation packet is the MAC Address of portable terminal;
IAD is given in step 402:DHCP server-assignment IP address, IAD is according to the mac address information that carries in the DHCP message, index the corresponding mobile terminal, then IP address allocated is transmitted to portable terminal, and finish the routing iinformation binding of IP address and MAC;
Step 403: portable terminal obtains the IP address, finishes the local address binding.
According to claim 2 or 3 described methods, it is characterized in that 5, when portable terminal was not supported the IP address assignment of IAD initiation in the step 3, the IP Address requests mode that portable terminal is initiated specifically comprised the steps:
Step 501: portable terminal is initiated IP application request to IAD, asks to be its distributing IP address;
Step 502: IAD judges whether to support the IP address assignment that portable terminal is initiated according to user configuration information, if allow, then as dhcp client to Dynamic Host Configuration Protocol server request IP address;
Step 503:DHCP server returns IP address allocated, and IAD is transmitted the IP address and given portable terminal, finishes the routing iinformation binding of IP address and MAC Address simultaneously.
6, method according to claim 1 is characterized in that, IAD is incidentally transmitted the distributing IP address to portable terminal by authentication message in the step 4.
7, method according to claim 1 is characterized in that, IAD is transmitted the distributing IP address by IP address notification message to portable terminal in the step 4.
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| CN200510037586XA CN1937632B (en) | 2005-09-23 | 2005-09-23 | Address distributing method for broadband wireless access system |
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| CN103825974A (en) * | 2014-02-24 | 2014-05-28 | 杭州华三通信技术有限公司 | DHCP contract extension processing method and device |
| CN103825974B (en) * | 2014-02-24 | 2017-11-14 | 新华三技术有限公司 | DHCP renewed treaty processing method and processing devices |
| CN105933465A (en) * | 2016-04-20 | 2016-09-07 | 北京小米移动软件有限公司 | Method and device for accessing wireless network |
| CN105933465B (en) * | 2016-04-20 | 2019-04-30 | 北京小米移动软件有限公司 | Access the method and device of wireless network |
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| CN1937632B (en) | 2011-05-11 |
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