CN1809076B - Generation and Analysis Method of Terminal IPv6 Address in Communication Network - Google Patents

Abstract

The present invention relates to a method for generating and analyzing a terminal IPv6 address in a communication network. The generating method includes: a network node for allocating an IPv6 address sends a message containing the preceding stage of the IPv6 address to a user terminal; after receiving the message, the user terminal can The identification number uniquely determining the identity of the user terminal is configured in the last 64 bits of the IPv6 address. The parsing method includes: the network node acquires the IPv6 address in the message after receiving the message from the user terminal; the network node extracts the last 64 bits of the IPv6 address as a unique identification number for determining its user terminal. Through the method provided by the present invention, the resources of IPv6 addresses are fully utilized, the delay in obtaining IP addresses and the possibility of failure of user terminals to access IP networks caused by network node failures are reduced, and network nodes can be obtained directly from IPv6 addresses. The number information of the terminal is convenient for network nodes to perform authentication, authentication, billing, etc.

Description

Generation and Analysis Method of Terminal IPv6 Address in Communication Network

technical field

The present invention relates to a method for generating and analyzing an IPv6 address of a terminal in a communication network, in particular to a method for generating an IPv6 address in which an identification number of a terminal is configured in the last 64 bits of the IPv6 address, and an IPv6 address based on the generating method parsing method.

Background technique

In a mobile communication network, when a user terminal (UE) wants to access an IP network, a node on the network side needs to assign an IP address to the UE, and the UE can access the IP network only after obtaining the IP address. In the currently used mobile communication network, GGSN (Gateway GPRS Supporting Node, Gateway GPRS Supporting Node) is responsible for assigning IP addresses to UEs. For IPv4 networks, when UE wants to access the IP network, it initiates a request to GGSN. The returned confirmation message carries the IPv4 address allocated for the UE. In order to avoid overlapping of UE addresses, the GGSN allocates different IPv4 addresses to different UEs.

With the development of network technology, IETF has proposed the IPv6 address, which is a 128-bit binary number and can support 2 ¹²⁸ terminals in theory. The first 64 bits of IPv6 are the address prefix, which is used to identify the subnet where the terminal is located; the last 64 bits are used to identify the terminal in the subnet. Different subnets have different address prefixes; different terminals in the same subnet have different identifiers in the subnet. In this way, different terminals either have different address prefixes (in different subnets), or have different intra-subnet identifiers (in the same subnet), so different terminals have different IPv6 addresses. At present, IETF and 3GPP suggest that the GGSN implement the function of IPv6 router in the mobile communication network, and assign different IPv6 address prefixes (the first 64 bits of IPv6 addresses) to different UEs to ensure that the IPv6 addresses of UEs are different from each other. Since different UEs have different IPv6 address prefixes, the last 64 bits of the IPv6 address (identification within the subnet) have no practical effect, and theoretically, the UE can be configured arbitrarily.

The procedure for UE to obtain an IPv6 address given by 3GPP is as follows: When GGSN receives a request from UE, it replies to UE with a confirmation message with an IPv6 address prefix (Prefix), and UE adds any 64 address prefix to the IPv6 address prefix in the message. Bit binary numbers can generate IPv6 addresses. The GGSN should ensure that different IPv6 address prefixes are sent to different UEs, so as to ensure that the IPv6 addresses generated by different UEs are different from each other.

In addition, in the mobile communication network, user authentication, authentication, and billing are all based on the UE's number (mobile phone number (MSISDN) or International Mobile Subscriber Identity (IMSI)), so when the UE accesses the IP network, the IP The network node also needs to obtain the number of the UE. This is difficult because when the UE accesses the IP network, the IP packet does not carry the MSISDN or IMSI. The method currently used to obtain the number of the UE is that the GGSN reports the correspondence between the MSISDN or IMSI and the IPv6 address prefix or IPv4 address to the Radius server before replying to the UE with the IPv6 address prefix or IPv4 address, and the Radius server will further report to the Radius server The WAP Gateway (WAP GW) reports this correspondence. After recording the corresponding relationship, the WAP gateway replies to the Radius server for confirmation, and the Radius server replies for confirmation to the GGSN. At this time, the GGSN sends a reply message containing the IPv6 address prefix or IPv4 address to the UE, so that the UE can generate an IPv6 address or configure an IPv4 address. When the UE accesses the IP network, the WAP gateway inserts the MSISDN or IMSI of the mobile terminal into the received IP message, so that various network nodes can extract the MSISDN or IMSI of the mobile terminal from the IP message for authentication, authentication, Billing and other operations.

There are following deficiencies in the above-mentioned prior art:

1. It takes a long time for the UE to obtain the IPv6 address prefix or the IPv4 address. Due to the need for information interaction between the GGSN, the Radius server, and the WAP gateway, and the GGSN, the Radius server, and the WAP gateway may have a large spatial distance (maybe computer rooms in different provinces), the UE needs to wait for a long time to obtain the IPv6 address prefix or IPv4 address prefix. address.

2. There are many failure points for the UE to obtain the IPv6 address prefix or the IPv4 address. If one of the Radius server and the WAP gateway fails, the UE will not be able to obtain the IPv6 address prefix or IPv4 address.

3. The WAP gateway needs to maintain the correspondence between the MSISDN or IMSI and the IPv6 address prefix or IPv4 address; and it needs to decapsulate the IP report of the UE accessing the IP network, insert the correct mobile phone number MSISDN and then re-encapsulate it and send it to the IP server in the network. On the one hand, the WAP gateway will become the bottleneck of the UE's access to the IP network performance; on the other hand, it will also increase the delay and failure points of the UE's access to the IP network.

4. The network node needs to be able to read the mobile phone number MSISDN from the IP message encapsulated by the WAP gateway, which has high requirements on the function and performance of the network node.

5. The IP packets for the UE to access the IP network must pass through the WAP gateway, which limits the networking of services. As more and more services are no longer based on the WAP protocol and have no relationship with the WAP gateway, this limitation becomes more and more unreasonable. This limitation also makes the WAP gateway a bottleneck for network service expansion.

6. Regarding the generation method of the IPv6 address in the prior art, the last 64 bits of the IPv6 address are not fully utilized, resulting in a huge waste of resources of the IPv6 address itself.

7. In the prior art, the GGSN needs to allocate different IPv6 address prefixes to different mobile terminals, and each mobile terminal will consume ²⁶⁴ address spaces, which is a serious waste of address resources. Although the IPv6 address space is huge, it is still difficult for mobile communication operators to obtain a large IPv6 address space from the address allocation agency. It is already quite difficult to meet the current mobile terminal address requirements. With the future machine-to-machine communication, vehicle terminals, and sensor networks With the development and commercialization of new technologies, insufficient addresses will still become an important problem that plagues mobile communication operators.

8. The GGSN needs to record which address prefixes have been allocated to ensure that different IPv6 address prefixes are allocated to different mobile terminals, which has certain performance and capacity requirements for the GGSN.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art above, and provide a method for generating a terminal IPv6 address in a communication network. By this method, the last 64 bits of the IPv6 address are filled with the number of the UE, and the resources of the IPv6 address are fully utilized. Since the information exchange between network nodes is reduced, the time for the UE to obtain the IP address is shortened, and the possibility of failure of the UE to access the IP network due to failure of the network nodes is also reduced.

Another object of the present invention is to provide a method for generating and analyzing terminal IPv6 addresses in a communication network in view of the deficiencies of the above-mentioned prior art. By this method, the IPv6 address includes UE number information, so that when the UE accesses the IP network, it can , the network node can directly obtain the number of the UE from the IPv6 address, so that it is convenient for the network node to perform operations such as authentication, authentication, and accounting on the UE.

In order to achieve the above object, the invention provides a method for generating a terminal IPv6 address in a communication network, comprising the steps of:

Step 11, the network node for allocating the IPv6 address sends a message containing the IPv6 address prefix to the user terminal, the IPv6 address prefix includes an identification field, and the identification field is used to identify the last 64 bits of the IPv6 address that the user terminal needs to configure Content;

Step 12. After receiving the message, the user terminal configures the mobile phone number or the International Mobile Subscriber Identification Number in the last 64 bits of the IPv6 address according to the identification field.

Since both MSISDN and IMSI are 16-bit decimal numbers, they can be represented by 64-bit binary numbers. Therefore, in the step 12, the user terminal may configure the mobile phone number or the International Mobile Subscriber Identification Number in the last 64 bits of the IPv6 address.

The present invention also provides a method for analyzing the IPv6 address of a terminal in a communication network, comprising the following steps:

Step 21, after receiving the message from the user terminal, the network node obtains the IPv6 address in the message;

Step 22, obtain the identification field in the IPv6 address prefix, and analyze the information contained in the identification field, determine the information content in the last 64 bits of the IPv6 address, and the network node extracts the last part of the IPv6 address according to the identification field 64 bits are used as the mobile phone number or International Mobile Subscriber Identification Number of the user terminal.

Through the generation method of the IPv6 address provided by the present invention, the last 64 bits of the IPv6 address are filled with the number of the UE, which fully utilizes the resource of the IPv6 address, and shortens the time for the UE to obtain the IP address due to the reduction of information interaction between network nodes. At the same time, it also reduces the possibility of failure of the UE to access the IP network due to the failure of the network node, and then through the analysis method of the terminal IPv6 address in the communication network provided by the present invention, the network node can directly obtain the UE from the IPv6 address. The number information of the network node is convenient for the network node to perform operations such as authentication, authentication, and charging on the UE.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the flowchart of the specific embodiment of the generating method of terminal IPv6 address in the communication network of the present invention;

FIG. 2 is a flowchart of a specific embodiment of a method for resolving an IPv6 address of a terminal in a communication network according to the present invention.

Detailed ways

Referring to Fig. 1, it is the flow chart of the specific embodiment of the generating method of terminal IPv6 address in the communication network of the present invention, comprises the following steps:

Step 101, after the GGSN receives the UE's request to access the IP network, it sends an acknowledgment message including the IPv6 address prefix to the UE;

Step 102. After receiving the confirmation message, the UE configures the MSISDN or IMSI in the last 64 bits of the IPv6 address.

Both MSISDN and IMSI are numbers that can uniquely determine the identity of a user terminal. 3GPP defines MSISDN and IMSI as follows:

IMSI::=TBCD-STRING(SIZE(3..8))

--digits of MCC，MNC，MSIN arc concatenated in this order.

TBCD-STRING::＝OCTET STRING

--This type(Telephony Binary Coded Decimal String) is used to

--represent several digits from 0 through 9, *, #, a, b, c, two

--digits per octet, each digit encoded 0000 to 1001(0 to 9),

--1010(*), 1011(#), 1100(a), 1101(b) or 1110(c); 1111 used

--as filler when there is an odd number of digits.

--bits 8765 of octet n encoding digit 2n

--bits 4321 of octet n encoding digit 2(n-1)+1

ISDN-AddressString::=

AddressString(SIZE(1..maxISDN-AddressLength))

--This type is used to represent ISDN numbers.

maxISDN-AddressLength INTEGER::＝9

AddressString::＝OCTET STRING(StZE(1..maxAddressLength))

--This type is used to represent a number for addressing

--purposes. It is composed of

--a) one octet for nature of address, and numbering plan

--indicator.

--b) digits of an address encoded as TBCD-String.

--a) The first octet includes a one bit extension indicator, a

--3bits nature of address indicator and a 4bits numbering

--plan indicator, encoded as follows:

--bit 8:1 (no extension)

--bits 765: nature of address indicator

--000 unknown

--001 international number

--010 national significant number

--011 network specific number

--100 subscriber number

--101 reserved

--110 abbreviated number

--111 reserved for extension

--all other values are reserved.

--b) The following octets representing digits of an address

--encoded as a TBCD-STRING.

maxAddressLength INTEGER::=20

SubscriberIdentity::=CHOICE{

imsi[0] IMSI,

msisdn[1]ISDN-AddressString

}

Among them, the mobile phone number (MSISDN) is a decimal number with the longest 16 digits (including country code and domestic mobile phone number), and its format is ISDN-AddressString, that is, an AddressString with a maximum length of 9; the first byte of AddressString is the type Logo, followed by TBCD-STRING; each byte of TBCD-STRING can represent two numbers (one number is represented by four-bit binary numbers); therefore, MSISDN can be represented by 64-bit binary numbers. The International Mobile Subscriber Identity (IMSI) is also a decimal number with a maximum length of 16 digits, and its format is IMSI (described in the first line of the above-mentioned 3GPP definition code on MSISDN and IMSI), that is, TBCD-STRING with a maximum length of 8 , each byte of TBCD-STRING can represent two numbers (a number is represented by four binary numbers); therefore, IMSI can also be represented by 64-bit binary numbers. Therefore, both MSISDN and IMSI can be configured in the last 64 bits of the IPv6 address.

Since both MSISDN and IMSI have the characteristic of uniquely identifying the UE identity, the IPv6 address prefix assigned by the GGSN to the UE can be repeated, and different UEs can be distinguished by the last 64 bits of the IPv6 address. The specific method for GGSN to assign an IPv6 address prefix to UE may be that when UE needs to access an IP network, it sends a request to GGSN to access an IP network, and after receiving the request, GGSN returns a confirmation message with an IPv6 address prefix to UE. If the GGSN wants to configure exactly the same IPv6 address prefix for the UEs within its coverage, it can broadcast an announcement message containing the IPv6 address prefix to the UEs within its coverage, which can make it easier for the UE to Get IPv6 address prefix. It also saves address space. Since the same IPv6 address prefix can be sent to different mobile terminals, the address space of the IPv6 prefix occupied by each terminal is 1, which greatly saves the address space. And GGSN does not need to record the use of IPv6 address prefixes.

In order to flexibly configure the last 64 bits of the IPv6 address, an identification field can be set in the prefix of the IPv6 address to identify the content of the last 64 bits of the IPv6 address that the UE needs to configure. After the UE obtains the prefix of the IPv6 address, Determine the corresponding content filled in the last 64 bits according to the information in the identification field. For example, the last two digits of the prefix of the IPv6 address can be set as the identification field. If the mobile terminal is expected to fill in the MSISDN, the GGSN should ensure that the last two digits of the prefix of the IPv6 address announced to the UE should be 01; if the UE is expected to fill in IMSI number, the GGSN should ensure that the last two digits of the announced IPv6 address prefix should be 10; and the first 62 digits of the IPv6 address can be considered to announce the same IPv6 address to different UEs (of course, it can also be considered to different UEs) The UE announces the first 62 bits of different IPv6 addresses, but it is not necessary that the first 62 bits of the IPv6 addresses announced to all UEs are different from each other). In this way, the UE does not need to detect whether the IPv6 address is duplicated, which can reduce the time delay for the mobile terminal to obtain the IPv6 address. Because of the IPv6 address prefix with ID=01 or 10, the last 64 bits must be filled with MSISDN or IMSI. Although the IPv6 address prefix sent by GGSN to different terminals may be the same, the MSISDN or IMSI of different terminals are different, so according to this scheme The generated IPv6 address is unique.

In order to be compatible with the existing technical solutions, the UE can also be allowed to configure the last 64 bits at will. If you want the mobile terminal to configure the last 64 bits at will, you should ensure that the last two bits of the IPv6 address prefix announced should be 00, and after When the two bits are 00, it is required that the first 62 bits of the IPv6 address prefix announced by the GGSN to different UEs cannot be repeated.

In the above-mentioned embodiments, the node that assigns the IPv6 address prefix to the UE is not limited to the GGSN. With the development of network technology, 3GPP began to propose the idea of simplifying the network structure. The current four nodes (GGSN, SGSN) between the UE and the IP network (Serving GRPS support node), RNC (radio network controller) and base station) are simplified into two nodes (GSN (GRPS service node) and AN (access node)), GSN assumes the function of the original GGSN, and AN assumes the original base station The functions of the SGSN and the RNC are shared by the GSN and the AN, and the GGSN in the above embodiment can be replaced by the GSN.

Based on the method for generating the IPv6 address of the terminal in the communication network of the present invention, the present invention also provides a method for analyzing the IPv6 address of the terminal in the communication network. The following specific examples will further illustrate the method for analyzing the IPv6 address of the present invention. Fig. 2, it is the flow chart of the specific embodiment of the analysis method of terminal IPv6 address in the communication network of the present invention, comprises the following steps:

Step 201, the network server in the IP network obtains the IPv6 address in the message after receiving the report from the UE;

Step 202, the network server in the IP network extracts the content in the last 64 bits of the IPv6 address as the MSISDN or IMSI of the UE. After the network server obtains the MSISDN or IMSI, it can perform authentication, authentication, billing, etc. kind of operation.

If in the process of generating the IPv6 address, the method of setting the identification field in the IPv6 address prefix is adopted, then in the corresponding parsing method, between the steps 201 and 202, it also includes: the network server obtains the IPv6 address The identification field in the prefix, and analyze the information contained in the identification field to determine the information content in the last 64 bits of the IPv6 address. For example: according to the setting of the identification field mentioned in the embodiment of the method for generating an IPv6 address above, if the last two bits in the prefix of the IPv6 address are 01, the network server extracts the last 64 bits of the IPv6 address as the MSISDN of the UE. If the last two digits in the prefix of the IPv6 address are 10, the network server extracts the last 64 digits of the IPv6 address as the IMSI of the UE.

It can be seen from the above embodiments that the network server resolves the UE number from the IPv6 address very easily, and any network node that the IP message arrives at or passes through can easily resolve the MSISDN or IMSI of the UE, only the IPv6 message needs to be parsed The source address in the header does not need to parse other parts of the IPv6 message, so the requirements for network nodes are not high. At the same time, it also removes the restriction that IP packets must pass through the WAP gateway. Since any network node that the IP packet arrives at or passes through can resolve the MSISDN or IMSI of the UE for authentication, authentication, accounting, etc., it avoids the need for WAP gateway dependency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be The scheme shall be modified or equivalently replaced without departing from the spirit and scope of the technical scheme of the present invention.

Claims (7)

1. a generation method of terminal IPv6 address in a communication network, it is characterized in that comprising the steps: Step 11, the network node for allocating the IPv6 address sends a message containing the IPv6 address prefix to the user terminal, the IPv6 address prefix includes an identification field, and the identification field is used to identify the last 64 bits of the IPv6 address that the user terminal needs to configure Content; Step 12. After receiving the message, the user terminal configures the mobile phone number or the International Mobile Subscriber Identification Number in the last 64 bits of the IPv6 address according to the identification field. 2. The generation method of terminal IPv6 address in the communication network according to claim 1, it is characterized in that in said step 12, if the information that said identification field contains is to require said user terminal to configure the mobile phone number in IPv6 information in the last 64 bits of the address, then the user terminal configures the mobile phone number in the last 64 bits of the IPv6 address. 3. the generation method of terminal IPv6 address in the communication network according to claim 1, it is characterized in that in described step 12, if the information that described identification field comprises is to require described user terminal to send International Mobile Subscriber Identification Number information configured in the last 64 bits of the IPv6 address, then the user terminal configures the International Mobile Subscriber Identification Number in the last 64 bits of the IPv6 address. 4. The generation method of terminal IPv6 address in the communication network according to claim 1, it is characterized in that in said step 12, if the information that described identification field comprises is to require described user terminal to arbitrarily configure IPv6 address 64-bit information, the user terminal can freely configure the last 64 bits of the IPv6 address. 5. the generation method of terminal IPv6 address in communication network according to claim 1 is characterized in that in described step 11, described network node for assigning IPv6 address receives the request of the visit IP network that user terminal sends Afterwards, return a confirmation message with the IPv6 address prefix to the user terminal. 6. the generating method of terminal IPv6 address in the communication network according to claim 1 is characterized in that in described step 11, described network node that is used to distribute IPv6 address broadcasts to its covered range The user terminal sends an announcement message including the prefix of the IPv6 address. 7. A method for analyzing terminal IPv6 addresses in a communication network, characterized in that it comprises the steps: Step 21, the network node obtains the IPv6 address in the message after receiving the message from the user terminal; Step 22, obtains the identification field in the IPv6 address prefix, and analyzes the information contained in the identification field to determine the IPv6 address The network node extracts the last 64 bits of the IPv6 address as the mobile phone number or international mobile subscriber identification number of the user terminal according to the identification field.