CN112235776B - Method for allocating IP address field according to needs and IP address statistical system - Google Patents
Method for allocating IP address field according to needs and IP address statistical system Download PDFInfo
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- CN112235776B CN112235776B CN202010898674.3A CN202010898674A CN112235776B CN 112235776 B CN112235776 B CN 112235776B CN 202010898674 A CN202010898674 A CN 202010898674A CN 112235776 B CN112235776 B CN 112235776B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
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Abstract
The invention provides a method for allocating IP address field according to need, which realizes that an effective IP address field (IPv4 address or IPv6 address) which can be directly accessed by a network side is allocated to User Equipment (UE) according to need by indicating the IP address field, the type of the IP address field and the number of IP addresses corresponding to each IP address field type in a PDU session establishment request message initiated by the User Equipment (UE) so as to be used by the User Equipment (UE) connected with the equipment downwards, thereby avoiding the waste of IP addresses; in addition, the invention sets the newly added field definition in the extension domain of the existing signaling message, namely the PDU conversation establishment request message, so that the invention has better forward and backward compatibility.
Description
Technical Field
The invention belongs to the technical field of information communication, and particularly relates to a method for allocating IP address segments according to needs and an IP address statistical system.
Background
In the 5G system, the IP address of the UE is allocated based on a PDU Session, that is, the IP address is allocated by a Session Management Function (SMF) according to a Data Network Name (DNN) requested by the UE through a local IP address pool, or is allocated by a third-party server (such as a Dynamic Host Configuration Protocol (DHCP) server, a Diameter server, or a Radius server, etc.), and then is sent to the UE through the Session Management function SMF and an access and mobility Management function AMF, where two IP addresses at most may exist in a PDU Session of the UE, one is an IPv4 address, and the other is an IPv6 address. The 5G system may be used in many scenarios, and in some scenarios, the UE may suspend other access devices through WiFi or a network port to provide communication services for the access devices. Generally, the IP address of the access device is directly allocated by the UE providing the access function, and the specific allocation process is as follows: when receiving an access request from an access device, a UE locally allocates an IP Address to the access device, and when receiving an IP packet of the access device, changes a source IP Address of the IP packet into an IP Address of the UE using a Network Address Translation (NAT) traversal function, and then sends the IP packet to a Network side, so that the Network side can only sense the existence of the UE but cannot sense the existence of an access device hanging under the UE. In the method for allocating the IP address to the access equipment by the UE, because the UE needs NAT traversal, the access equipment can normally perform service interaction with an application server on a network side only by initiating a service request firstly, and the method cannot support the called process of a calling service.
In addition, in order to solve the problem that a valid IPv4 address end that can be directly accessed by the PDN GW side cannot be allocated to the UE, in the existing method, an IPv4 address segment is allocated to the UE on the PDN GW side, and the numbers of the initial IPv4 address and the IPv4 address of the IPv4 address segment are all allocated by the PDN GW. Because the PDN GW cannot know the actual number of the UE downlink access devices and cannot accurately know whether the UE supports the downlink access devices, the existing method reserves some IPv4 addresses that may not be immediately used for each accessed UE, which causes waste of IPv4 addresses to a certain extent, and the method only supports allocation of IPv4 address segments and does not support allocation of IPv6 address segments.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for allocating IP address segments as needed and an IP address statistics system, which can avoid the problem of IP address waste.
A method of allocating IP address segments on demand, comprising the steps of:
user Equipment (UE) sends a PDU session establishment request message to a mobility management function (AMF), wherein a 5GSM Capability IE field in the PDU session establishment request message is used for indicating whether an IP address field is supported, and an Extended protocol configuration option IE field is used for indicating the type of the IP address field and the number of IP addresses corresponding to each IP address field type;
after receiving a PDU session establishment request message, the AMF sends a session management context establishment request message to a Session Management Function (SMF), wherein the session management context establishment request message carries a 5GSM Capability IE field and an Extended protocol configuration option IE field;
after receiving the session management context establishment request message, the SMF judges whether an indication for supporting an IP address field exists in a 5GSM Capability IE field, if so, allocates the IP address field for the UE according to the number of IP addresses indicated in an Extended protocol configuration option IE field, and sends the initial address of the IP address field or prefix information of the initial address to the AMF through an Extended protocol configuration option IE field in the session management context establishment request message;
and the AMF sends the Extended protocol configuration options IE field to the user equipment UE through a PDU session establishment receiving message to realize the demand allocation of the IP address field.
Further, an 8 th bit in a 3 rd byte of a 5GSM Capability IE field is used to indicate whether an IP address field is supported, wherein if the value of the 8 th bit is 0, it indicates that the PDU session establishment request message does not support the IP address field; and if the value of the 8 th bit is 1, the PDU session establishment request message is indicated to support the IP address field.
Further, the first 3 bits in the 3 rd byte of the Extended protocol configuration options IE field are used to indicate the type of the IP address field, wherein if the value of the 3 bits is 001, the type of the IP address field supported by the PDU session establishment request message is an IPv4 address, and meanwhile, the 4 th and 5 th bytes of the Extended protocol configuration options IE field are used to indicate the number of IPv4 addresses; if the value of the 3 bits is 010, the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, and meanwhile, the 4 th byte and the 5 th byte of an Extended protocol configuration option IE field are adopted to indicate the number of interface identifiers of an IPv6 local link address; if the value of the 3 bits is 011, the type of the IP address segment supported by the PDU session establishment request message is an IPv4v6 address, and meanwhile, the 4 th byte of the Extended protocol configuration options IE field is used to indicate the number of IPv4 addresses, and the 5 th byte is used to indicate the number of interface identifiers of the IPv6 local link address.
Further, the types of the IP address segment include an IPv4 address, an IPv6 address, and an IPv4v6 address;
if the type of the IP address field supported by the PDU session establishment request message is an IPv4 address, the session management function SMF allocates an IPv4 address for the user equipment UE according to the number of the indicated IP addresses;
if the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, the Session Management Function (SMF) allocates an interface identifier of an IPv6 local link address for the User Equipment (UE) according to the number of the indicated IP addresses;
if the type of the IP address segment supported by the PDU session setup request message is an IPv4v6 address, the session management function SMF allocates interface identifiers of an IPv4 address and an IPv6 local link address to the user equipment UE according to the number of indicated IP addresses.
Furthermore, an IP address statistical system based on the method for allocating the IP address field according to the requirement comprises a first receiving unit, an IP address statistical unit and a first sending unit;
the first receiving unit is used for receiving an access request initiated by equipment to be accessed;
the IP address counting unit is used for counting the requirement of each device to be accessed on the IP address from all the access requests, wherein the requirement comprises IP address field types and the number of the IP addresses under each IP address field type;
the first sending unit is used for sending the requirement of each device to be accessed on the IP address to the user equipment UE so that the user equipment UE can construct a PDU session establishment request message.
Has the advantages that:
1. the invention provides a method for allocating IP address field according to need, which realizes that an effective IP address field (IPv4 address or IPv6 address) which can be directly accessed by a network side is allocated to User Equipment (UE) according to need by indicating the IP address field, the type of the IP address field and the number of IP addresses corresponding to each IP address field type in a PDU session establishment request message initiated by the User Equipment (UE) so as to be used by the User Equipment (UE) connected with the equipment downwards, thereby avoiding the waste of IP addresses; in addition, the invention sets the newly added field definition in the extension domain of the existing signaling message, namely the PDU conversation establishment request message, so that the invention has better forward and backward compatibility.
2. The invention provides an IP address statistical system, which evaluates the quantity of requested IP addresses by counting the requirement of the IP address of a User Equipment (UE) side, effectively ensures the purpose of allocating the IP addresses according to the requirement and avoids the waste of the IP addresses.
Drawings
FIG. 1 is a signaling diagram of a method for allocating IP address segments on demand according to the present invention;
FIG. 2 is a diagram illustrating the definition of 5GSM Capability IE fields provided by the present invention;
FIG. 3 is a diagram illustrating the definition of Extended protocol configuration options IE field provided by the present invention;
FIG. 4 is a schematic block diagram of an IP address statistics system provided by the present invention;
fig. 5 is a schematic block diagram of a session management entity device provided in the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
Example one
As shown in fig. 1, a signaling diagram of a method for allocating IP address segments on demand according to the present invention is provided. A method of allocating IP address segments on demand, comprising the steps of:
s1: the method comprises the steps that User Equipment (UE) sends a PDU Session Establishment Request message (PDU Session Establishment Request) to a mobility management function (AMF), wherein a 5GSM Capability IE field in the PDU Session Establishment Request message is used for indicating whether an IP address field is supported, and an Extended protocol configuration options IE field is used for indicating the type of the IP address field and the number of IP addresses corresponding to each IP address field type.
As shown in fig. 2, octets 1 to 15 indicate 15 bytes in the 5GSM Capability IE field, each byte having 8 bits; the invention adopts the 8 th bit IP Add Seq in the 3 rd byte of the 5GSM Capability IE field to indicate whether the IP address field is supported, wherein if the value of the 8 th bit is 0, the PDU session establishment request message is indicated not to support the IP address field; if the value of the 8 th bit is 1, it indicates that the PDU session setup request message supports the IP address segment. In addition, a 1 st bit Rqos in a 3 rd byte may be used to indicate whether a 5GSM capability of reflecting Qos is supported, if the value of the bit Rqos is 0, it indicates that the reflecting Qos is not supported, and if the value of the bit Rqos is 1, it indicates that the reflecting Qos is supported; and a 2 nd bit MH6-PDU in a 3 rd byte is adopted to indicate whether the multi-homing IPv6 PDU session is supported or not, if the value of the bit MH6-PDU is 0, the multi-homing IPv6 PDU session is not supported, and if the value of the bit MH6-PDU is 1, the multi-homing IPv6 PDU session is supported.
As shown in fig. 3, octets 1 to 15 indicate 15 bytes in an Extended protocol configuration option IE field, each byte having 8 bits; the invention intercepts a section of bit to indicate the type of IP address section from the subsection content ID (FFFFH) of the Extended protocol configuration option IE field, and the number of IP addresses corresponding to each IP address section type; specifically, the type of the IP address segment is indicated by the first 3 bits in the 3 rd byte of the Extended protocol configuration options IE field, and the remaining bits of the byte are 0, where if the value of the 3 bits is 001, the type of the IP address segment supported by the PDU session establishment request message is an IPv4 address, and meanwhile, the 4 th and 5 th bytes of the Extended protocol configuration options IE field are used to indicate the number of IPv4 addresses; if the value of the 3 bits is 010, the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, and meanwhile, the 4 th byte and the 5 th byte of an Extended protocol configuration option IE field are adopted to indicate the number of interface identifiers of an IPv6 local link address; if the value of the 3 bits is 011, the type of the IP address segment supported by the PDU session establishment request message is an IPv4v6 address, and meanwhile, the 4 th byte of the Extended protocol configuration options IE field is used to indicate the number of IPv4 addresses, and the 5 th byte is used to indicate the number of interface identifiers of the IPv6 local link address.
It should be noted that the types of the IP address segment include an IPv4 address, an IPv6 address, and an IPv4v6 address;
if the type of the IP address field supported by the PDU session establishment request message is an IPv4 address, the session management function SMF allocates an IPv4 address for the user equipment UE according to the number of the indicated IP addresses; if the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, the Session Management Function (SMF) allocates an interface identifier of an IPv6 local link address for the User Equipment (UE) according to the number of the indicated IP addresses; if the type of the IP address segment supported by the PDU session setup request message is an IPv4v6 address, the session management function SMF allocates interface identifiers of an IPv4 address and an IPv6 local link address to the user equipment UE according to the number of indicated IP addresses.
S2: after receiving a PDU Session Establishment Request message (PDU Session Establishment Request), the mobility management function AMF sends a Session management context Establishment Request message (Nsmf _ pduse _ CreateSMContext Request) to the Session management function SMF, where the Session management context Establishment Request message (Nsmf _ pduse _ CreateSMContext Request) carries a 5GSM Capability IE field and an Extended protocol configuration options IE field.
S3: after receiving the session management context establishment Request message (Nsmf _ pduse _ CreateSMContext Request), the session management function SMF determines whether an indication for supporting an IP address field exists in the 5GSM Capability IE field, and if so, allocates an IP address field to the UE according to the number of IP addresses indicated in the Extended protocol configuration options IE field, and sends the start address of the IP address field or prefix information of the start address to the mobility management function AMF through the Extended protocol configuration options IE field in the session management context establishment Request message.
That is, after receiving the session management context setup Request message (Nsmf _ pduse _ CreateSMContext Request), if the message indicates a Request IP address field, the SMF allocates an IP address field to the UE according to the number of requested IP addresses indicated in the message, and sends the start address of the IP address field or prefix information of the start address to the AMF through a subfield starting from a container ID ffffffffffh in the field "Extended protocol configuration option IE" of the message session management context setup Request message (Nsmf _ pduse _ CreateSMContext Response).
For example, if the IP address field type indicates IPv4 and the number of IP addresses is n, the SMF allocates n IPv4 addresses to the UE; if the IP address type is indicated to be IPv6 and the number of the IP addresses is m, the SMF allocates m interface identifiers of IPv6 local link addresses for the UE; if the IP address type is indicated to be IPv4IPv6, the number of IPv4 addresses is n, and the number of IPv6 addresses is m, the SMF allocates n IPv4 addresses for the UE, and allocates m interface identifiers of IPv6 local link addresses.
S4: the mobility management function AMF sends an Extended protocol configuration options IE field to the user equipment UE through a PDU Session Establishment Accept message (PDU Session Establishment Accept), so as to implement the on-demand allocation of the IP address field.
Therefore, the method for allocating the IP address field according to the needs provided by the invention firstly initiates a PDU session establishment request through User Equipment (UE), the request message indicates whether to apply for the IP address field, if so, the request message also carries the type of the IP address field and the number of the IP addresses contained in the corresponding IP address field; the user equipment UE sends the PDU session establishment request to a mobility management function AMF, and the mobility management function AMF forwards the PDU session establishment request to a session management function SMF; a Session Management Function (SMF) receives a PDU session establishment request, and judges whether the UE requests IP address field distribution or not, and then the SMF distributes IP addresses according to the quantity of the requested IP addresses; SMF sends the initial address of the IP address segment to AMF through PDU conversation building response; the AMF sends the starting address of the IP address field to the UE through a PDU session establishment response.
Meanwhile, as can be seen from the implementation manners provided above, in the present invention, a "5 GSM Capability IE" is Extended in a PDU session establishment request message to indicate whether an IP address field is applied, and an "Extended protocol configuration options IE" is Extended to indicate the types of IP address fields (IPv4, IPv6, IPv4IPv6) and the number of IP addresses included, so as to indicate the type of IP addresses that need to be allocated and the number of allocated IP addresses to the SMF, thereby implementing that the SMF allocates only a required IP address field to the terminal for use by an access device that is hung below the terminal, and the network side can also directly access these IP addresses.
It should be noted that, in addition to expanding the 5GSM Capability IE field and the Extended protocol configuration options IE field to implement the indication of the IP address, an IP address field information field may be added in the PDU session establishment request message to indicate whether to apply for the IP address field, the type of the IP address field, and the number of the included IP addresses, which is not described in detail herein.
Example two
Based on the IP address segment allocation method provided in the foregoing embodiment, correspondingly, the present embodiment provides an IP address segment statistics system, and a schematic structural diagram of the system is shown in fig. 4, and specifically includes a first receiving unit 200, an IP address statistics unit 201, and a first sending unit 202;
the first receiving unit 200 is configured to receive an access request initiated by a device to be accessed;
the IP address statistics unit 201 is configured to count, from all access requests, requirements of each device to be accessed for an IP address, where the requirements include IP address segment types and the number of IP addresses in each IP address segment type;
the first sending unit 202 is configured to send, to the user equipment UE, the requirement of each device to be accessed for an IP address, so that the user equipment UE constructs a PDU session establishment request message.
In addition, the IP address field statistical system may further include a session management entity device, and a schematic structural diagram of the device is shown in fig. 5, and specifically includes a second receiving unit 300, an address field allocating unit 301, a transmission channel processing unit 302, and a second sending unit 303;
the second receiving unit 300 is configured to receive Nsmf _ pdusesion _ CreateSMContext Request, and parse "5 GSM Capability IE" and "Extended protocol configuration options IE".
The address field allocation unit 301 is configured to receive an IP address field allocation indication, and if the IP address field type is IPv4, the address field allocation unit generates IPv4 addresses of the requested number; if the IP address field type is IPv6, the address field allocation unit generates the interface identifier of the IPv6 local link address of the requested number; if the IP address field type is IPv4IPv6, the address field allocation unit generates interface identifiers of IPv4 addresses corresponding to the number of requests and IPv6 local link addresses corresponding to the number of requests, respectively.
The transmission channel processing unit 302 is configured to map and bind the IP address field information allocated by the address field allocation unit and GTP tunnel information of the UE.
The second sending unit 303 is configured to send the allocated IP address field information to the AMF through "Extended protocol configuration options IE" in the Nsmf _ pduse _ CreateSMContext Response.
In summary, the present invention realizes that an effective IP address segment that can be directly accessed by a network side is allocated to a user equipment UE as required by indicating an IP address segment request and the number of requested IP addresses in a PDU session establishment request message initiated by the user equipment UE, for the user equipment UE to attach to an access device. Preferably, the number of the requested IP addresses is evaluated through the IP address field counting function of the UE side, the purpose of allocating the IP addresses according to needs is effectively guaranteed, and the waste of the IP addresses is avoided; on the other hand, the method fully considers the distribution of IPv4 and IPv6 address fields; on the last hand, the newly added information domain is arranged in the extension domain of the existing signaling message to be carried, so that the signaling message has better forward and backward compatibility.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it will be understood by those skilled in the art that various changes and modifications may be made herein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for allocating IP address segments on demand, comprising the steps of:
user Equipment (UE) sends a PDU session establishment request message to a mobility management function (AMF), wherein a 5GSM Capability IE field in the PDU session establishment request message is used for indicating whether an IP address field is supported, and an Extended protocol configuration option IE field is used for indicating the type of the IP address field and the number of IP addresses corresponding to each IP address field type;
after receiving a PDU session establishment request message, the AMF sends a session management context establishment request message to a Session Management Function (SMF), wherein the session management context establishment request message carries a 5GSM Capability IE field and an Extended protocol configuration option IE field;
after receiving the session management context establishment request message, the SMF judges whether an indication for supporting an IP address field exists in a 5GSM Capability IE field, if so, allocates the IP address field for the UE according to the number of IP addresses indicated in an Extended protocol configuration option IE field, and sends the initial address of the IP address field or prefix information of the initial address to the AMF through an Extended protocol configuration option IE field in the session management context establishment request message;
and the AMF sends the Extended protocol configuration options IE field to the user equipment UE through a PDU session establishment receiving message to realize the demand allocation of the IP address field.
2. The method of claim 1, wherein an 8 th bit in a 3 rd byte of a 5GSM Capability IE field is used to indicate whether the IP address field is supported, wherein if the 8 th bit has a value of 0, it indicates that the PDU session setup request message does not support the IP address field; and if the value of the 8 th bit is 1, the PDU session establishment request message is indicated to support the IP address field.
3. The method of claim 1, wherein the first 3 bits in the 3 rd byte of the Extended protocol configuration options IE field are used to indicate the type of the IP address field, wherein if the value of the 3 bits is 001, the type of the IP address field supported by the PDU session establishment request message is an IPv4 address, and meanwhile, the 4 th and 5 th bytes of the Extended protocol configuration options IE field are used to indicate the number of IPv4 addresses; if the value of the 3 bits is 010, the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, and meanwhile, the 4 th byte and the 5 th byte of an Extended protocol configuration option IE field are adopted to indicate the number of interface identifiers of an IPv6 local link address; if the value of the 3 bits is 011, the type of the IP address segment supported by the PDU session establishment request message is an IPv4v6 address, and meanwhile, the 4 th byte of the Extended protocol configuration options IE field is used to indicate the number of IPv4 addresses, and the 5 th byte is used to indicate the number of interface identifiers of the IPv6 local link address.
4. The method of claim 1, wherein the types of the IP address segment include an IPv4 address, an IPv6 address, and an IPv4v6 address;
if the type of the IP address field supported by the PDU session establishment request message is an IPv4 address, the session management function SMF allocates an IPv4 address for the user equipment UE according to the number of the indicated IP addresses;
if the type of the IP address field supported by the PDU session establishment request message is an IPv6 address, the Session Management Function (SMF) allocates an interface identifier of an IPv6 local link address for the User Equipment (UE) according to the number of the indicated IP addresses;
and if the type of the IP address field supported by the PDU session establishment request message is an IPv4v6 address, the Session Management Function (SMF) allocates interface identifiers of an IPv4 address and an IPv6 local link address for the User Equipment (UE) according to the number of the indicated IP addresses.
5. An IP address statistical system based on the method for allocating IP address segments on demand of claim 1, comprising a first receiving unit, an IP address statistical unit, and a first transmitting unit;
the first receiving unit is used for receiving an access request initiated by equipment to be accessed;
the IP address counting unit is used for counting the requirement of each device to be accessed on the IP address from all the access requests, wherein the requirement comprises IP address field types and the number of the IP addresses under each IP address field type;
the first sending unit is used for sending the requirement of each device to be accessed on the IP address to the user equipment UE so that the user equipment UE can construct a PDU session establishment request message.
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| CN113382468B (en) * | 2021-06-24 | 2022-11-04 | 深圳艾灵网络有限公司 | Address allocation method for local network device, electronic device, and storage medium |
| CN115604184A (en) * | 2021-07-09 | 2023-01-13 | 展讯半导体（南京）有限公司（Cn） | Data routing method and device |
| CN114051018B (en) * | 2021-09-24 | 2024-04-12 | 中盈优创资讯科技有限公司 | Method and device for distributing IPv6 address to network equipment based on network architecture |
| CN114900499B (en) * | 2022-04-20 | 2023-10-03 | 中国电信股份有限公司 | IP address allocation method, device, equipment and storage medium |
| CN114980075B (en) * | 2022-05-05 | 2024-09-17 | 中国电信股份有限公司 | Address allocation method, session management functional entity and communication system |
| CN115086276B (en) * | 2022-07-14 | 2023-04-25 | 中国联合网络通信集团有限公司 | Address management method, device, equipment and system |
| CN115460168B (en) * | 2022-08-22 | 2024-05-14 | 浪潮通信信息系统有限公司 | IPv6 capacity analysis method and system based on resource management |
| CN115865710A (en) * | 2022-11-10 | 2023-03-28 | 中盈优创资讯科技有限公司 | IPv6 address number calculating and representing method and device |
| CN116016423A (en) * | 2022-12-23 | 2023-04-25 | 赛尔网络有限公司 | IPv6 address rapid identification method, device, equipment, medium and program product |
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