TW201201605A - Charging control message method of handover among heterogeneous networks - Google Patents

Abstract

A method for improving charging control message efficiency of handover among heterogeneous networks increases the exchange efficiency of charging control message when a user handovers between two heterogeneous networks including an LTE (long term evolution) and a non-3GPP. The architecture defined in the current 3GPP R8 version (TS23.203 and TS23.402) has a low efficiency on policy and charging control between heterogeneous networks (LTE/Non-3GPP). The invention improves the flow of transmitting the message and the transmission of unpack reassembled messages to increase the handover speed. Control message and charging message are merged through the piggyback approach to decrease the amount of information to be exchanged. Separation charging control and PMIP controlled message are synchronously transmitted to decrease the waiting time.

Description

201201605 * VI. Description of invention: 'Technical field of invention】 System Architecture is defined in 3GPP TS 23.882

Evolution (SAE) principles, including: (1) improve user satisfaction, reduce service delays, increase data transmission rate; (2) achieve full Ip network environment, improve system capacity and coverage, and reduce operating costs; (3) Both 3GPP and Non-3GPP wireless access systems must be supported. • According to SAE's goal, Ev〇luti〇n in 3GPP Release 8

Packet Core (EPC) develops an all-IP network that can simultaneously access a variety of different wireless access technologies, such as LTE (L〇ng Term Ev〇Lti〇n; Long Term Evolution), 2G/3G, and other Non- 3GPP's network technologies (such as WiMAX) are available to telecommunications operators. Heterogeneous network integration can increase network usage and meet the SAE principle. Therefore, 3GPP and Non-3GPP integrated network architecture is deprecated in the 3GPP Reiease 8 specification, where WiMAx φ is classified as Trusted Non-3GPP. network. The 3GPP TS23.4〇2 specification establishes a process for migration between heterogeneous networks, including the process flow of Policy and Charging Control (PCC). The policy and charging control architecture can implement dynamic network resource allocation control and charging management. The communication protocol of policy and charging control is based on the Diameter protocol. In addition to the performance of Diameter itself, policy and charging control. The mechanism also causes a large amount of signaling burden, which is a big challenge for the continuity of services. 201201605 [Prior Art] FIG. 1 depicts the PCC architecture of 3GPP Release 8. The main components include: (1) Pol icy and Charging Rule Function (PCRF) (11) The negative strategy controls and provides the charging rules. The PCRF consists of two components: Decision Decision Function (PDF). (12) and a Charging Rule Function (CRF) (13). (2) The Po 1 icy and Charging Enforcement Function (PCEF) (14) is built on the external data packet network gateway (PDN GW), and the PCEF contains the policy execution unit ( Policy Enforcement Function; PEF) (15) and Traffic Plane Function (TPF) (16), PEF is the unit that actually executes the policy' and TPF uses the IP filter for flow control. Access to the gateway (Bearer Binding and Event Reporting)

Function; BBERF/Serving-GW (17) is 3GPP and other Non-3GPP network links. This component was added for Release 8 in response to access to the Non-3GPP network. When the user equipment (User Element; UE) (18) performs initial connection establishment, relocation, or Q〇S (Quality of Service) conditions, both the PDN GW and the BBERF need to re-require policy control with the PCRF. For the charging rule, the PCRF transmits the policy control and charging rules to the PCEF through the Gx interface and transmits the policy control and charging rules to the BBERF/Serving-GW through the Gxa interface. The policy control and charging rules include the service sessi〇n filter (source/destination IP address and port number of the 201201605 side), QoS description (QoS class, maximum and guaranteed bandwidth 'and uplink and downlink transmission speeds), and Fee information (billing method and charging key). The roaming network architecture of LTE and Non-3GPP network interface is described in the 3GPP TS 23.402 specification. The Local Breakout network architecture is shown in Figure 2. In the roaming architecture, Home Subscriber Server; HSS (21), AAA Server (22), and hPCRF (23) are all in the Home Network, and the mobile device is LTE on the VPLMN connection, and in 3GPP and Non-3GPP. Roaming between networks. In the EPS network architecture, both 3GPP and Non-3GPP are connected through the Serving Gateway (24), as shown in Figure 2, WiMAX access service gateway (ASN-GW) (25) Interfacing with the LTE network; and interfacing with the SGSN (Service GPRS SUPPORT NODE; SGSN) and the LTE network in the 3GPP network. During roaming, the visited PCRF (vPCRF) (26) acts as a proxy, and forwards the hPCRF and PDN GW to the Diameter message between the BBERF; the hPCRF communicates with the PCC control message (Control Message) through the interface S9 and the Gx and the PDN GW. 'The PCC control message is also communicated through ASN-GW in S9 and Gxa and WiMAX. The ASN-GW consists of three parts: PMIP MAG (26) is the PMIPv6 Access Gateway (MAG); BBERF (27) is the Bear Binding in the policy control and charging rules. The value is combined with the PCC charging rule; the AAA Client (28) is the authenticated client. 201201605 In the process of retransmission, as shown in Figure 8, the main signaling exchange process includes the authentication and authorization of the UE, the exchange of PCC rules, and the exchange of mobile management messages. The UE can continue the next action after passing the identity authentication and authorization. In the authentication and authorization procedure, the UE will request identity confirmation from the 3GPP AAA server in the H〇me Network through the Non-3GPP network.

Mobile Node Network Access Identifier (MN NAI), which is used to confirm the identity of the UE during action management. The 3GPP AAA server then queries the HSS to obtain the PDN GW identification (Identity) and replies to the Non-3GPP network access system. In this way, the network element of the N〇n-3GPP can know the address of the PDN GW to be connected. The mobility management protocol used here is Pr〇xy Mobile IP v6 (PMIPv6) developed by the IETF. PMIPv6 defines two network elements: the Mobi le Access Gateway (MAG) and the Location Mobi 1 ity Anchor (LMA). All action management actions are handled by these two network elements, and MAG will send a Proxy Binding Update to LMA to request a registration link. When the Mobile Ip link is completed, the LMA will respond to the proxy Binding Ack, and it is now complete to complete the link channel of M〇bi ie ip. In this network architecture, the MAG is located in the ASN-GW, and the LMA is located in the PDN GW. According to the load analysis between the measured PCC message processes, users must have better Pcc performance under the heterogeneous network. 201201605 can support the large signaling load (Signal ing Overhead) generated by the transfer. Reduce service delays. UE will have two pcc processes during the process of transferring between heterogeneous networks.

Control Message Request/Ack, the first time BBERF requests Gateway Control Session Establishment to hPCRF; the second is PCEF-Initiated IP-CAN Session Modification Procedure. The establishment of the Mobi le IP connection between the ASN-GW and the PDN GW also needs to wait for the IP-CAN Session Modification φ Procedure to complete. So interleaving and waiting between PCC Control Message and PM IP may cause more delay time. How to reduce latency and PCC signaling load is the focus of the present discussion. [Object of the Invention] The main object of the present invention is to reduce the 0verhead and wait caused by the exchange of policies and charging control (P〇1icy and Charging c〇ntr〇l pcc) between users when transferring between heterogeneous networks. Time, increasing the effectiveness and speed of the transfer to comply with SAE principles. SUMMARY OF THE INVENTION As shown in FIG. 4, the present invention combines two actions for establishing a Gateway Control Session for a Data Packet Network Gate (PDN GW) and a Bearer Link and Event Reporting Function Unit (bbref). Because during the first PCC Control Message Request c〇ntr〇1 201201605

Session£图四Step5) The ip address, PDN GW identification, Access Technology Type and other information have been sent to the hPCRF. The hPCRF can respond to the PCEF Rules to the ASN without waiting for the PCEF to send out the PCEF-Initiated IP-CAN Session Modification Procedure. At the same time as GW's BBERF, the hPCRF-Initiated IP-CAN Procedure is directly started, and the PCC Rules are sent to the PDN GW. This can save the second PCC Control Message Request, Proxy Binding Update/Ack丄 Figure 4 Step7, Step8) can also be carried out simultaneously with PCC Control Message Request/Ack£_Figure 4 Step5, Step6). The method for processing the billing message and the action management control message exchange according to the present invention includes the following steps (refer to block 110 of Figure 7): Step: 111, piggybacking the policy and charging control message program (Piggyback) PCC Control Message Procedure) The hPCRF merges the PCC Rules Control to be sent to the PDNGW and the Target GW (BBERF), and replies to the BSNF of the ASN-GW through the Gx and Gxa interface PCC Rules, and also directly starts the hPCRF-Initiated IP. -CAN Procedure, send PCC Rules to PDN GW; 201201605 Step: 112, Action Management Agent Link Request Procedure (PMIP Binding Request

Procedure) ASN-GW PMIP MAG sends Proxy Binding to PDN GW

Update requires registration, this message contains mn ΝΑΙ > Lifetime* Access Technology Type 'Handover Indicator' where MN NAI is used to confirm the identity of the UE, and L if et i me is the lifetime of this connection (this is still null) ' Access Technology Type is used to indicate the access medium used by Non-3GPP, such as WiMAX; Step: 113, Action Management Agent Link Response Procedure (PMIP Binding Ack)

Procedure) The PDN GW responds to a PMIP Binding Acknowledgement message to the MAG of the ASN-GW. This message contains MN Li, Li f et ime, UE φ Address Info. MN NAI is to be consistent with MN NAI in Proxy Binding Update, Lifetime represents the lifetime of this connection, UE Address I nf o IP is assigned to the IP Address of jjE; Step 111 can be performed simultaneously with steps (112, 113), The steps (112, 113) can be performed without waiting for the PDN_GW to complete the setting of the PCC Rule (step U1), thereby reducing the policy and charging control (PCC) message exchange and the PMIP action management control message waiting for each other. time. 201201605 Ancillary Note: The flow required for 3GPP's standardization includes the following steps (please refer to block 120 of Figure 7): Step 121: The UE and WiMAX ASN-GW establish a connection UE originally connected through 3GPP On the network, PM I Pv6 is used to enter the N〇n-3GPP signal range (such as WiMAX) for its mobile management protocol UE, and decides to move to the WiMAX network. The UE accesses the identity authentication and authorization of the Non-3GPP network through the 3GPP AAA Server. After the authentication is successful, 3Gpp AAA Server will reply to

The PDN GW of the non-3GPP network access system (eg, asn-GW) user identifies 'for future WiMAX access to the network. In addition, the 3GPP AAA Server will also reply to the PMP MAG in the ASN-GW to confirm the identity of the UE when establishing the Mob i 1 e IP connection in PM IPv 6. After the identity authentication and authorization procedure of the UE is completed, the UE and the ASN-GW of the WiMAX establish a connection of the Layer 3, and proceed to step 122. In step 122, the BBERF sends the BBERF in the Gateway Control Session Establishment ASN-GW to the hPCRF through the VPCRF. The requirements of the Gateway Control Session Establishment are to obtain the policy control and charging rules' and the obtained rules are to be installed and set by the BBERF in the ASN-GW for these rules. 丨2 3 ; Step: 123, Connect Line setup completes and releases connection resources. This is done with one of the ASMw hits. The establishment of the PMlpv6 connection between the ASN-GW and the GW is completed. If there are other PDNs that need to be linked, this step is completed. Release the original connection resources; [Features and Efficacy] φ The present invention has the following features and functions: 1 · The difference between this innovative technology and the existing technology is novelty: The specification of the .4〇2 specification in the 3GPP R8 version The process of transfer between heterogeneous networks, such as the process of policy and billing control (PCC). The pcc architecture can realize dynamic network resource allocation control and billing management. The PCC communication protocol is based on the DUmeter protocol. In addition to the Diameter's own performance problem, the PCC mechanism also causes the burden of the L-L. Service continuity is a big challenge, there is no discussion of performance in the specification, and there are no related papers and research. Therefore, the present invention proposes a method of integrating and adjusting the PCC Control Message, which can reduce the impact of the PCC message flow and PMIP on the transfer performance. 2. Advantages and effects of this innovative technology compared with existing technologies: Progressive: The process of transfer between heterogeneous networks defined by 3GPP TS23.402 specification interleaves and waits between PCC Control Message and PMIP, 201201605 can Will cause more delay time. The less the number of recursions that the user needs to perform: the user service day "a1 length variation value is larger, because there are more short material retention time, so the mobile device will continue to move and increase the number of handovers. Therefore, the method proposed in this study is effective in reducing more signaling load. To evaluate this side; to go to the effectiveness, let us stand the decentralized event model

(Dlstnbuted SlmuUti〇n M〇d called the simulation on the assumption that the coverage with the μ network is a ... grid ((4) size area (one network: can be regarded as a base station, - a coffee or a Serving-GW , t盍 range) 'Assume that the coverage of a N〇n_3Gpp network is .χ. 7 ° In the simulation level ^ 'You can use the (4) rOxWrO grid extension « ( Gnd TQpQlQgy) to simulate the user's action path and Delivery procedure.

: Five is shown as a (5 + 3) gamma grid topology. In the initial state, the UE ::〇rmly) knife is placed at any point on the graph and will be assigned at each =', the average value (10) (10)) is - and the Variance is Vc. The user moves in any direction, the probability that it is the same as the previous one, and the probability of multi-moving to other directions is (l-q)/3. From this, a connection service is calculated—the distribution of the number N of cross-heterogeneous network handovers that the user will perform, and then the signaling load reduced by the method is analyzed. In the simulation r, suppose m=5, n=3 m =1 Λ v The simulation results are shown in Fig. 6. And (a) the connection lifetime is Ρ for Xp〇nential, the mean mt=100, () is. _. Assign the mean - and shape...~ 12 201201605 parameter)=b. The simulation results show that the user, ^ ^ ^ the number of recursions of the track is >,. The variation in the length of the user's service room is purely large. There is a shorter waiting time for the car owner. Therefore, the action device will continue to increase the number of handovers. Therefore, this method will effectively reduce more signaling load. To sum up, this case is not only innovative in terms of technical thinking, but also able to enhance multiple functions more than the conventional method. 'The legal invention should be fully complied with the novelty and progressiveness. 'Proposed in accordance with the law', please ask your authority to approve this article. Inventing the invention application, in order to invent the invention, to the sense of virtue. [Embodiment] As shown in Figure 4, the changed process is as follows:

Stepl: Assume that the UE was originally connected to the network through 3Gpp and uses PMIPv6 as its action management agreement;

Step2: The UE enters the N0n-3GPP signal range (such as WiM Αχ) and decides to move to the WiMAX network.

Step3: The UE accesses the identity and authorization of the Non-3GPP network through the 3GPP AAA Server. After the authentication is successful 3 (3ΡΡΑαα Server will reply to

The PDN GW of the user of the Non-3GPP network access system (such as ASN-GW) recognizes 'for future WiMAX access to the network. In addition, the 3GPP AAA Server also replies the MN NAI to the PMP MAG in the ASN-GW to confirm the identity of the UE when establishing the Mobile IP connection in PMIPv6; 13 201201605

Step4: After the identity authentication and authorization procedure of the UE is completed, the UE and the ASN-GW of the WiMAX establish a connection of the Layer 3;

Step 5: The BBERF in the ASN-GW sends the Gateway Control Session Establishment request to the hPCRF through the vPCRF to obtain the policy control and charging rules, and the obtained rules are used to install and set these rules in the BBERF in the ASN-GW;

Step6: hPCRF transmits PCC through Gx and Gxa interface through vPCRF

Rules to PDN GW and BBERF ;

Step7: Same as Step 6 in Figure 3;

Step8: The PDN GW responds to a PMIP Binding Acknowledgement message to the MAG of the ASN-GW. This message contains the MN NAI,

Lifetime, UE Address Info. ΜΝ ΝΑΙ To be consistent with the MN NAI in Proxy Binding Update, Lifetime represents the lifetime of this connection, and UE Address Info is the IP Address assigned to the UE;

Step9: The connection of the Layer 3 connection between the UE and the ASN-GW is completed;

Step 10: The establishment of the PMIPv6 connection between the ASN-GW and the PDN GW is completed; Stepll: If other PDNs need to be connected, this step is completed; Stepl2: Release the original 3GPP connection resources. The PCC Control Message (Figure 4 Step 5 and Step 6) in the above process can be performed simultaneously with PMIP Message (Step 4 and Step 8 in Figure 4), which can reduce the impact of PCC message flow and PMIP on the transfer performance. 14 201201605 The present invention analyzes and analyzes the number of times a user needs to perform a cross-heterogeneous network after connecting to a network, thereby understanding the effect of the improved method on the overall performance of the user. The PCC Control Message (Figure 4 Step 5 and Step 6) in the above process can be performed simultaneously with PMIP Message (Step 4 and Step 8 in Figure 4), which can reduce the impact of PCC message flow and PMIP on the transfer performance. [Simple diagram of the diagram] _ Figure 1 GPP R8 version of the strategy and billing control architecture; Figure 2 PMIP-based S8, S2a (Chained PMIP-based S8-S2) roaming architecture; Figure 3 from 3GPP recursive to Non- 3GPP IP Access process; Figure 4 improves the signaling flow from 3 GPP to Ν ο - 3 GPP IP A ccess; Figure 5: Dual network coverage architecture of the simulation environment; Figure 6 performance comparison diagram; Figure; and Figure 8 3GPP technical flow chart [main component symbol description] Policy and Charging Rule Function (PCRF) 12 Policy Decision Function (PDF) The unit that generates the charging rule (Charging Rule Function ; CRF) 15 201201605 14 Policy and Charging Enforcement Function (PCEF) 15 Policy Execution Unit (PEF) 16 Traffic piane Function (TPF)

17 Accessing the gateway device (Bearei· Binding and Event Reporting Function; BBERF/Serving-GW 18 user device (user·Element; UE)

21 Home Subscriber Server;HSS 22 AAA Server

23 hPCRF 24 Serving Gateway 25 Access Service Gateway (Access Service Network

Gateway; ASN-GW) 26 PCRF (vPCRF) 27 PMIPv6 access gateway (PMIP mag) 28 authenticated client (AAA Client) 110 The method for processing billing messages specified by the present invention 111 carries a bearer strategy And billing control message program 112 action management agent link request procedure 113 action management agent link response procedure 120 3GPP specifications

121 Handheld Mobile Device (UE) and WiMAX 201201605 (Worldwide Interoperability for Microwave Access) access service gateway (ASN_GW) establish connection 122 bearer connection and event reporting function unit (BBERF) Gateway Control Session Establishment 123 Connection establishment and release connection resources

17

Claims (1)

201201605 VII. Patent application scope: A method for charging control messages when transferring between heterogeneous networks, allowing users to transfer between LTE and non-3GPP heterogeneous networks; Switching efficiency, which can be implemented in LTE networks and trusted non-3Gpp-connected network architectures, the patent-pending steps include... (1) 挟π-bearing policy and charging control message procedures, (2) the Action Management Agent Link Request Procedure; and (3) the Action Officer Agent Link Response Procedure. 2. For example, if the patent application scope is the method for charging control messages when the heterogeneous network is transferred between the 1st, the φ 7 , / , and 3 挟 挟 T bearer strategies and the billing The setting steps of the control message program include: (1) The gateway control connection will access the technical type IP address, the data packet network gateway identification 'send to the local policy and charging rule unit; =4 朿 与 计 计 法 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元The (3) Family Policy and Billing Rules unit that is initially activated gives the data packet network gateway. Sending Policy and Billing Control Law 18 201201605 -1, the method of controlling the message during the heterogeneous inter-network transfer as described in item 1 of the patent scope, the strategy of the load and the fee control message program » 玄 动 皆 代理 代理 代理 代理 代理 代理 代理 代理 代理 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( The method for improving the efficiency of the charging control message according to item 2, wherein the setting of the piggybacking policy and the charging control message program is completed (4). 4. The „性网” as described in the patent application. The method of controlling the message, 1 for it. Before the ten-funded strategy and charging control U sequence, the following steps must be performed: (1) The handheld mobile device and the W smoke access gateway are connected; (2) The bearer connection and event reporting function unit sends out the closed loop control connection establishment requirement. #5. The method for charging control information when the heterogeneous network moves between the applications mentioned in the first paragraph of the patent application is as follows: ,in 4 After the completion of the connection management response, the connection establishment process completes and releases the connection resources.