CN111132177A - Adaptation method and device for 5G access network deployment - Google Patents
Adaptation method and device for 5G access network deployment Download PDFInfo
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Abstract
The invention discloses an adaptation method and an adaptation device for 5G access network deployment, wherein the adaptation method comprises the following steps: interacting with the 5G base station through an NG interface; interacting with an LTE EPC core network through an S1 interface; s1 protocol messages transmitted by an LTE EPC core network through an S1 interface are adapted to NG protocol messages which can be received and identified by a 5G base station; NG protocol messages transmitted by the 5G base station through the NG interface are adapted to S1 protocol messages which can be received and identified by an LTE EPC core network. The adapting device comprises an S1 interface module, an NG interface module and an interface protocol adapting module. The invention does not need to research and develop a novel 5G core network, can quickly realize the deployment and application of the 5G technology, simultaneously supports the subsequent development and has higher market application value.
Description
Technical Field
The invention relates to wireless communication or wireless network technology, in particular to an adaptation method and an adaptation device for 5G access network deployment.
Background
4G communication technology has been widely used for a long time, deployment and implementation of next generation technology (5G) have been developed globally, and the demand for mobile data has increased explosively, and it is difficult for existing communication systems to meet future demands. Moreover, compared with the existing communication system, the 5G communication technology has a qualitative leap in the aspects of transmission rate, time delay and stability, and can easily meet the future communication requirements. The application is mainly embodied in the following aspects: firstly, the 5G communication technology will promote the internet of things technology of all things interconnection. The 5G communication technology enables more users to communicate using the same frequency resource, thereby greatly improving frequency application efficiency without increasing base station density. Applying this technology to build a private network will enable to interconnect all platforms equipped with 5G communication modules into a network within an area. Second, 5G communication technology will support deep convergence of information networks. The private network 5G communication technology can be applied to various heterogeneous information communication networks for deep fusion to form a mutually compatible high-speed information network so as to realize a more efficient work task. Finally, the 5G communication technology is extended to millimeter wave communication resources, thereby enabling private network dedicated frequency bands. The problem that the frequency bands of the existing private network mobile communication system and the public network mobile communication system are overlapped, shared and interfered with each other is effectively solved. Therefore, the 5G communication technology provides an integrated information communication network with wide area coverage, high-speed transmission and strong compatibility for private network construction.
From the perspective of a private network, a 3GPP option6 architecture is adopted, so that on one hand, an LTE core network is utilized to reduce development cost, shorten development period and carry out deployment of a novel network as soon as possible, and the core network has mature and stable functions; on the other hand, the air interface technology of the 5G base station and the terminal is utilized instead of the LTE base station, and the advantages of Massive MIMO, millimeter wave communication and the like are utilized to ensure the transmission rate and the transmission quality. However, under the current situation of existing LTE networks, each large operator is more inclined to adopt the Option3 manner for 5G network deployment. That is, for the operator, the solution of Option6 has no advantage over Option3, and instead, the complexity of the terminal is increased. Therefore, the Option6 scheme has been abandoned in the process of 3GPP standardization. The result is that no suitable commercial termination chip for option6 is available. However, for the Option6 mode which is not favored by operators, it is a good choice for many industry private network applications, such as coal mines, ports, factories, etc., because most industry private networks have small scale compared with public networks, the Option6 scheme can meet the requirement of rapid deployment, and can also meet the requirements of industry production, manufacture and operation by using 5G technology.
Disclosure of Invention
The invention aims to provide an adaptation method and an adaptation device for 5G access network deployment, which can quickly realize deployment and application of a 5G technology without developing a novel 5G core network and simultaneously support subsequent evolution.
The technical solution for realizing the purpose of the invention is as follows: an adaptation method for a 5G access network deployment, comprising:
interacting with the 5G base station through an NG interface;
interacting with an LTE EPC core network through an S1 interface;
s1 protocol messages transmitted by an LTE EPC core network through an S1 interface are adapted to NG protocol messages which can be received and identified by a 5G base station;
NG protocol messages transmitted by the 5G base station through the NG interface are adapted to S1 protocol messages which can be received and identified by an LTE EPC core network.
Further, an S1 signaling message transmitted by the LTE EPC core network through an S1-C interface is adapted to be an NG signaling message of a 5GS NG-C interface and is transmitted to a 5G base station through the NG-C interface;
the EPS NAS message transmitted by the LTE EPC core network through the S1-C interface is adapted to the NAS message of the 5GS NG-C interface and is transmitted to the 5G base station through the NG-C interface; and the EPS NAS message data is not encrypted.
Further, the LTE EPC core network bears data messages through S1 transmitted by the S1-U interface, is adapted to PDU session data messages of the 5GS NG-U interface, sets QFI (quad Flat interface) identification of the PDU session data messages according to the S1 bearing identification and QoS (quality of service) attributes of the bearing identification, and transmits the PDU session data messages to the 5G base station through the NG-U interface.
Further, an NG signaling message transmitted by the 5G base station through an NG-C interface is adapted to be an S1 signaling message of an EPS S1-C interface and is transmitted to an LTE EPC core network through an S1-C interface;
the 5G base station is adapted to be an NAS message of an EPS S1-C interface through a 5GS NAS message transmitted by an NG-C interface, and is transmitted to an LTE EPC core network through an S1-C interface; and the 5GS NAS message data is not encrypted.
Further, the PDU session data message transmitted by the 5G base station through the NG-U interface is adapted to the S1 bearer data message of the EPS S1-U interface, the corresponding S1 bearer is determined according to the QFI identifier of the PDU session data message, and then the S1 bearer data message is transmitted to the LTE EPC core network through the S1-U interface.
An adapting device for 5G access network deployment, the adapting device comprises an S1 interface module, an NG interface module and an interface protocol adapting module;
the S1 interface module comprises an S1-C interface and an S1-U interface and is used for interacting with an LTE EPC core network;
the NG interface module comprises an NG-C interface and an NG-U interface and is used for interacting with the 5G base station;
the interface protocol adaptation module is used for adapting an LTE EPC core network with a 5G base station.
Further, an S1 signaling message transmitted by the LTE EPC core network through an S1-C interface is adapted to be an NG signaling message of a 5GS NG-C interface and is transmitted to a 5G base station through the NG-C interface;
the EPS NAS message transmitted by the LTE EPC core network through the S1-C interface is adapted to the NAS message of the 5GS NG-C interface and is transmitted to the 5G base station through the NG-C interface; and the EPS NAS message data is not encrypted.
Further, the LTE EPC core network bears data messages through S1 transmitted by the S1-U interface, is adapted to PDU session data messages of the 5GS NG-U interface, sets QFI (quad Flat interface) identification of the PDU session data messages according to the S1 bearing identification and QoS (quality of service) attributes of the bearing identification, and transmits the PDU session data messages to the 5G base station through the NG-U interface.
Further, an NG signaling message transmitted by the 5G base station through an NG-C interface is adapted to be an S1 signaling message of an EPS S1-C interface and is transmitted to an LTE EPC core network through an S1-C interface;
the 5G base station is adapted to be an NAS message of an EPS S1-C interface through a 5GS NAS message transmitted by an NG-C interface, and is transmitted to an LTE EPC core network through an S1-C interface; and the 5GS NAS message data is not encrypted.
Further, PDU session data messages transmitted by the 5G base station through the NG-U interface are adapted to S1 bearer data messages of the EPS S1-U interface, corresponding S1 bearers are determined according to QFI identifiers of the PDU session data messages, and then the S1 bearer data messages are transmitted to the LTE EPC core network through the S1-U interface
Compared with the prior art, the invention has the following remarkable advantages: the invention provides an adaptation method and an adaptation device for 5G access network deployment under a 3GPP communication standard-based wireless communication private network architecture, which can quickly construct a 5G wireless communication network system through a 5G base station and an LTE EPC core network, and utilize a commercial 5G terminal to realize the quick deployment of a 5G private network, and are particularly suitable for network deployment in the vertical industry.
Drawings
Fig. 1 is a schematic diagram of a signaling flow for establishing 5G terminal initial context information.
Fig. 2 is a schematic diagram of an interface control plane downlink signaling message adaptation flow.
Fig. 3 is a schematic diagram of an interface control plane uplink signaling message adaptation flow.
Fig. 4 is a schematic diagram of an embodiment of control plane NAS adaptation.
Fig. 5 is a schematic diagram of adaptation flow of NAS information without encryption in control plane downlink.
Fig. 6 is a schematic diagram of a NAS information adaptation flow without encryption in control plane uplink.
Fig. 7 is a schematic diagram of a user plane signaling flow.
Fig. 8 is a schematic diagram of an embodiment of interface user interface downlink data information processing.
Fig. 9 is a schematic diagram of an embodiment of interface user plane uplink data information processing.
Fig. 10 is a schematic diagram of a single base station multi-terminal wireless private network system.
Fig. 11 is a schematic diagram of the 5G private network deployment adaptation architecture of the present invention.
Detailed Description
The invention is used for a single base station based on the 5G technology, a wireless communication private network in a small range, a novel 5G core network does not need to be developed, the deployment and application of the 5G technology can be rapidly realized, and the subsequent evolution is supported.
The invention supports the access of the 5G commercial terminal by introducing an adaptation module of an NG interface and an S1 interface between an LTE EPC core network and a 5G base station. The core content of the invention comprises the following points:
(1) downlink control plane data of the LTE EPC core network is sent to the adaptation module through an S1 interface, and after being repackaged by the adaptation module, the downlink control plane data can be sent to the 5G base station through an NG interface and identified by the 5G base station; uplink control plane data of the 5G base station is sent to the adaptation module through the NG interface, and can be sent to the LTE EPC core network through the S1 interface after being repackaged by the protocol adaptation module and identified by the LTE EPC core network;
(2) the adaptation method of the control plane NAS information is characterized in that the EPS NAS information which is not encrypted is adapted to be 5GSNAS information by an adaptation module and is transmitted to a 5G terminal, and the 5GS NAS information which is not encrypted is adapted to be EPS NAS information by the adaptation module and is transmitted to an LTEEPC core network;
(3) the mapping between the uplink and the downlink of the user plane S1 and the PDU session is carried, the LTE EPC core network carries data messages through S1 transmitted by an S1-U interface, the data messages are adapted to the PDU session data messages of a 5GS NG-U interface in an adaptation module, QFI (quad Flat interface) identification of the PDU session data messages is set according to S1 carrying identification and QoS (quality of service) attributes of the PDU session data messages, and then the PDU session data messages are transmitted to a 5G base station through the NG-U interface. The PDU conversation data message transmitted by the 5G base station through the NG-U interface is loaded on the S1 of the adaptation module which is adapted to the EPS S1-U interface, the corresponding S1 load is determined according to the QFI mark of the PDU conversation data message, and then the S1 load data message is transmitted to the LTE EPC core network through the S1-U interface.
In one embodiment, as shown in fig. 11, a 5G private network deployment adaptation architecture includes a 5G base station 1, a base station for 5G communication; a mobile communication device in a 5G terminal 2, 5G network; an LTE EPC core network 3, based on the core network of the LTE technology; and the adapting device 4 is used for adapting the LTE EPC core network with the 5G base station. The adaptation method for 5G access network deployment can adapt the signaling message on the S1 interface and the NG interface by using an adaptation device, so that the 5G base station can communicate with the LTEEPC core network. The scheme can ensure that the downlink data of the S1 interface of the LTE EPC core network can be normally received and identified by the NG interface of the 5G base station after being adapted, and can also ensure that the uplink data of the NG interface can be normally received and identified by the S1 interface after being adapted. The method does not need to research and develop a novel 5G core network, can quickly realize the deployment and application of the 5G technology, supports subsequent development and has higher market application value.
The present invention will be described in detail with reference to examples.
Examples
The invention provides an adaptation method for 5G access network deployment, and the following describes an embodiment of the invention in detail with reference to the accompanying drawings.
As shown in fig. 10, in a cell covered by a single base station, an identity-admitted 5G terminal is connected to the 5G base station through an NR-RAN, and an interface protocol adaptation module adapts an NG interface and an S1 inlet and then connects to an LTE EPC core network.
1. Adaptation device and module-to-control plane adaptation method
Fig. 1 is a schematic diagram of a signaling flow established by 5G terminal initial context information, and the main steps are as follows:
(1) the interface protocol adaptation module receives an S1 interface protocol message from an LTE EPC core network, such as an INITIALCONTIT SETUP REQ message;
(2) the interface protocol adaptation module adapts the message to be the message of NG interface protocol, such as INITIAL CONTEXT SETUPREQUEST message;
(3) and the interface protocol adaptation module sends the adapted NG interface message to the 5G base station through the NG interface. The 5G base station triggers a corresponding 5G RRC process;
(4) the 5G base station generates a confirmation message of an NG interface protocol, such as an INITIAL CONTEXT SETUP RESPONSE message, and sends the confirmation message to the interface protocol adaptation module through the NG interface;
(5) the interface protocol adaptation module adapts the interface protocol into an acknowledgement message of an S1 interface protocol, such as an INITIAL CONTEXTSTETUP RESPONSE message;
(6) and the interface protocol adaptation module sends the adapted message to the LTE EPC core network through an S1 interface.
2. One embodiment of control plane downlink signaling message adaptation
In the downlink control signaling transmission from the LTE EPC core network to the 5G base station, the LTE EPC core network sends an INITIAL CONTEXT SETUP REQUEST of an S1 interface protocol to an adapting device and a module through an S1 interface, and the interface protocol adapting module is adapted to an INITIAL CONTEXT SETUP REQUEST message of an NG interface protocol and sends the message to the 5G base station through an NG interface, so that a corresponding 5G flow is triggered. Table 1 and table 2 list the information elements contained in S1 and NG interface protocol message INITIAL CONTEXT setup request, respectively, where Presence is M for mandatory items and Presence is O for optional items, and the present invention only considers the adaptation of the mandatory item message.
TABLE 1 contextual information contained in INITIAL CONTEXT SETUP REQUEST of the LTE S1 interface protocol
TABLE 25G contextual information contained in INITIAL CONTEXT SETUP REQUEST of NG interface protocol
Fig. 2 is an adaptation process, and the specific implementation is as follows:
(1) the interface protocol adaptation module maps the Message Type in the INITIAL context REQUEST Message (hereinafter referred to as S1 Message) from the LTE EPC core network received from the S1 interface to the Message Type in the INITIAL context REQUEST Message (hereinafter referred to as NG Message) of the NG interface protocol;
(2) the interface protocol adaptation module maps the MME UE S1AP ID in the S1 message to the AMF UENGAP ID in the NG message. Table 3 shows the detailed information of the MME UE S1AP ID message, Table 4 shows the detailed information of the AMF UE NGAP ID message, and the value range of the MME UE S1AP ID message is (0.. 2)32-1), AMF UE NGAP ID message has a value range of (0.. 2)40-1), the value of the MME UE S1AP ID message does not exceed the value range of the AMF UE NGAP ID message, so the value of the MME UE S1AP ID message is directly filled in the AMF UE NGAP ID message to implement mapping;
TABLE 3 MME UE S1AP ID specific information
TABLE 4 AMF UE NGAP ID specific information
(3) The interface protocol adaptation module maps the eNB UE S1AP ID in the S1 message to the RAN UENGAP ID in the NG message;
(4) the interface protocol adaptation module maps the UE Aggregate Maximum Bit Rate in the S1 message to the UE Aggregate Maximum Bit Rate in the NG message;
(5) the interface protocol adaptation module sets GUAMI of NG messages as default values according to a 5G NG interface control plane protocol, and the table 5 is specific information of the GUAMI, wherein PLMN Identity can be obtained by reading base station configuration, and AMF RegionID, AMF Set ID and AMF Pointer can be Set according to the base station configuration;
TABLE 5 GUAMI detailed information
(6) The interface protocol adaptation module sets the PDU Session ID of the NG message as a pre-configuration value according to a 5G NG interface control plane protocol;
(7) the interface protocol adaptation module sets the S-NSSAI of the NG message as a default value according to a 5GNG interface control plane protocol;
(8) the interface protocol adaptation module maps the E-RAB to Be Setup List of the S1 message to the PDUSENSIONResource Setup Request Transfer of the NG message;
(9) the interface protocol adaptation module sets the Allowed NSSAI in the NG message as a default value according to the 5G NG interface control plane protocol;
(10) the interface protocol adaptation module maps the UE Security Capabilities of the S1 message to the PDU Security Capabilities of the NG message;
(11) the interface protocol adaptation module maps the Security Key of the S1 message to the Security Key of the NG message.
3. One embodiment of control plane uplink signaling message adaptation
The 5G base station sends an INITIAL CONTEXT SETUP RESPONSE message of an NG interface protocol to the adaptation device and the adaptation module through an NG interface, and the interface protocol adaptation module is adapted to an INITIAL CONTEXT SETUP RESPONSE message of an S1 interface protocol and sends the message to an LTE EPC core network through an S1 interface. Fig. 3 is an adaptation process, and the specific implementation is as follows:
(1) the interface protocol adaptation module maps the Message Type in the INITIAL CONTEXT SETUP RESPONSE Message (hereinafter referred to as NG Message) received from the NG interface to the Message Type in the INITIAL CONTEXT SETUP RESPONSE Message (hereinafter referred to as S1 Message) of the S1 interface;
(2) the interface protocol adaptation module maps the AMF UE NGAP ID in the NG message to the MME UES1AP ID in the S1 message. As known from tables 3 and 4, the AMF UE NGAP ID message is obtained by adapting the downlink MME UE S1AP ID message, and the AMF UE NGAP ID message does not exceed the value range of the MME UEs1AP ID, so the value of the AMF UE NGAP ID message is directly filled in the MME UE S1AP ID message to implement mapping;
(3) the interface protocol adaptation module maps the RAN UE NGAP ID in the NG message to the eNB UES1AP ID in the S1 message;
(4) the interface protocol adaptation module maps the PDU Session Resource Setup response transfer in the NG message to the E-RAB Setup List in the NG message.
4. Method for adapting control plane NAS information
In the present invention, the transmission of the EPS NAS message and the 5GS NAS message is performed in an unencrypted manner, and fig. 4 is a schematic diagram of an adaptation flow, as follows:
(1) the interface protocol adaptation module receives an EPS NAS message from the LTE EPC core network, such as ATTCHACCEPT;
(2) adapting it to 5GS NAS messages, such as REGISTRATION ACCEPT, by an interface protocol adaptation module;
(3) the interface protocol adaptation module transmits the 5GS NAS message to a 5G base station through an NG interface;
(4) the interface protocol adaptation module receives a 5GS NAS message from a 5G base station, such as PDU SESSIONMODIFICATION REQUEST;
(5) the interface protocol adaptation module adapts it to an EPS NAS message, such as BEARER response Allocation request;
(6) the interface protocol adaptation module sends the EPS NAS message to an LTE EPC core network through an S1 interface;
5. one embodiment of a control plane downlink non-encryption NAS information adaptation flow
The interface protocol adaptation module receives an EPS NAS message ATTCHACCEPT from an LTE EPC core network from an S1 interface, adapts the EPS NAS message ATTCHACCEPT into a 5GS NAS message REGISTRATION ACCEPT, and sends the message to the 5G base station through an NG interface. Fig. 5 is an adaptation flow, and a specific adaptation embodiment is as follows:
(1) the interface Protocol adaptation module maps a Protocol descriptor in a ATTACH ACCEPT message (hereinafter referred to as an S1 message) received by an S1 interface to an Extended Protocol descriptor in a REGISTRATION ACCEPT message (hereinafter referred to as an NG message) of an NG interface;
(2) the interface protocol adaptation module maps the Security header type in the S1 message to the Security header type in the NG message;
(3) the interface protocol adaptation module maps the Attach access message identity in the S1 message to the Registration access message identity in the NG message;
(4) the interface protocol adaptation module maps EPS attach result in S1 message to 5GSregistration result in NG message;
(5) the interface protocol adaptation module maps the Spare half octet in the S1 message to the Spare half octet in the NG message;
(6) the interface protocol adaptation module maps T3412 value in the S1 message to T3502value in the NG message;
(7) the interface protocol adaptation module maps the TAI list in the S1 message to the TAI list in the NG message;
(8) the interface protocol adaptation module maps the GUTI in the S1 message to the 5G-GUTI in the NG message;
(9) the interface protocol adaptation module maps the Equivalent PLMNs in the S1 message to the Equivalent PLMNs in the NG message;
(10) the interface protocol adaptation module maps the Emergency number list in the S1 message to the Emergency number list in the NG message;
(11) the interface protocol adaptation module maps Extended DRX parameters in the S1 message to Negotiated DRX parameters in the NG message;
(12) the interface protocol adaptation module maps Non-3GPP NW provided policies in the S1 message to Non-3GPP NW policies in the NG message;
(13) the interface protocol adaptation module maps the Extended authentication number list in the S1 message to the Extended authentication number list in the NG message;
(14) other unmatched data are configured according to the base station configuration.
6. Control plane uplink non-encryption NAS information adaptation flow
When receiving a 5GS NAS message PDU SESSION MODIFICATION REQUEST from a 5G base station, the adaptation module adapts the PDU SESSION MODIFICATION REQUEST into an EPS NAS message BEARER RESOURCE ALLOCATION REQUEST and transmits the EPS message BEARER RESOURCE ALLOCATION REQUEST to an LTE EPC core network through an S1 interface. Fig. 6 is an adaptation process, and the specific implementation is as follows:
(1) the interface Protocol adaptation module maps an Extended Protocol descriptor in a PDU SESSION MODIFICATION REQUEST message (hereinafter referred to as NG message) in an NG interface format to a Protocol descriptor in a BEARERESOURCE ALLOCATION REQUEST message (hereinafter referred to as S1 message) in an S1 interface format;
(2) the interface protocol adaptation module maps the PTI in the NG message to the Proceduretransaction identity in the S1 message;
(3) the adaptation module maps the PDU SESSION MODIFICATION REQUEST message identity in the NG message to the Bearer resource allocation REQUEST message identity in the S1 message;
(4) the interface protocol adaptation module maps the Requested QoS rules and Requested QoSflow descriptions in the NG message to the Requested traffic QoS in the S1 message. The QoS rules contain a list of QoS entries, each QoS entry containing a list of packet filters, a list of parameters, QFI, priority, etc. parameters. For an IP type or ethernet type PDU session, a Packet Filter Set whose default QoS rule is the only one in the PDU session may contain QoS rules that allow all UL Packet filters, and for an untransformed type PDU session, the default QoS rule does not contain any Packet Filter Set (Packet Filter Set), and the default QoS rule defines the processing manner of all packets in the PDU session;
(5) the interface protocol adaptation module maps Extended protocol configurations in the NG message to Extended protocol configurations in the S1 message.
7. Adaptation method for bearing/PDU conversation management flow signaling
Taking user plane E-RAB bearer as an example, an LTE EPC core network initiates E-RAB establishment, fig. 7 is a signaling flow diagram, and the specific implementation manner is as follows:
(1) the interface protocol adaptation module receives an E-RAB SETUPREQUEST message of an S1 interface protocol from an LTE EPC core network;
(2) the interface protocol adaptation module adapts the protocol to be a PDU SESSION response resource request message of an NG interface protocol;
(3) the interface protocol adaptation module is sent to the 5G base station through an NG interface, and the 5G base station triggers a corresponding 5G RRC management process;
(4) the 5G base station generates a PDU SESSION RESOURCE MODIFY RESPONSE message of NG interface protocol, and sends the message to the configuration device and the module through the NG interface;
(5) the interface protocol adaptation module adapts the RESPONSE message into an E-RAB setup RESPONSE message of an S1 interface protocol, and sends the E-RAB setup RESPONSE message to the LTE EPC core network through an S1 interface.
8. One embodiment of bearer/PDU session management procedure downlink signaling
Referring to FIG. 7, the LTE EPC core network sends E-RAB SETUP REQUEST message of S1 interface protocol to the adaptation device and module through S1 interface. The adaptation module adapts the PDU SESSION response MODE REQUEST message to an NG interface protocol, and sends the message to the 5G base station through an NG interface to trigger a corresponding 5G RRC process. Table 6 shows the context contained in the E-RAB SETUPREQUEST in the S1 interface format, and Table 7 shows the context contained in the PDU SESSION RESOURCE SETUPREQUEST in the NG interface format. Wherein, the Presence marked as M is the necessary item, the Presence marked as O is the optional item, the invention only considers the adaptation of the necessary item message.
TABLE 6 context information contained in E-RAB SETUP REQUEST of the LTE S1 interface protocol
Context information table contained in PDU SESSION RESOURCE SETUP REQUEST of Table 75G NG interface protocol
Fig. 8 is an adaptation process, and the specific implementation is as follows:
(1) the interface protocol adaptation module maps the Message Type in the S1-E-RAB SETUP REQUEST Message (hereinafter referred to as S1 Message) received from the S1 interface to the Message Type in the PDU SESSION RESOURCE MODIFY REQUEST Message (hereinafter referred to as NG Message) of the NG interface;
(2) the interface protocol adaptation module maps the MME UE S1AP ID in the S1 interface message to the AMF UE NGAP ID in the NG interface message. As known from tables 3 and 4, the AMF UE NGAP ID message does not exceed the value range of the MME UE S1AP ID, so the value of the AMF UE NGAP ID message is directly filled in the MME UE S1AP ID message to implement mapping;
(3) the interface protocol adaptation module maps the eNB UE S1AP ID in the S1 interface message to the RAN UE NGAP ID in the NG interface message;
(4) the interface protocol adaptation module fills default values according to RANPaging Priority of a 5G interface user plane protocol GTP-U in NG interface messages;
(5) the interface protocol adaptation module fills a default value according to a PDU Session ID of a 5G interface user plane protocol GTP-U in an NG message, wherein the PDU Session ID is a PDU Session ID and indicates the PDU Session to which the DRB belongs;
(6) the interface protocol adaptation module maps the NAS-PDU in the S1 message to the NAS-PDU in the NG interface message;
(7) the interface protocol adaptation module maps the E-RAB to be Setup List in the S1 interface message to the PDU Session Resource modification Request Transfer in the NG message. According to S1 load bearing and QoS identification specified by 5G protocol, adding SDAP header, packing with SDAP SDU to SDAP PDU, for QFI and RQI parameters in downlink SDAP PDU, ngNB is read from GTP-U packet head extension parameter of NG-U port; the 5GS extends the TS29.281 protocol, and extends two extension header types, wherein the QoS related control is related to an extension header 'PDU Session Container' (type is 10000101);
(8) the interface protocol adaptation module fills in default values according to the S-NSSAI of the 5G interface user plane protocol GTP-U in the NG message.
9. One embodiment of bearer/PDU session management procedure uplink signaling
As shown in fig. 7, the 5G base station sends a PDU SESSION RESOURCE modification response message of NG interface protocol to the adaptation device and module through the NG interface. The adaptation module sends the E-RAB SETUPRESPONSE message which is adapted to the protocol of the S1 interface to the LTE EPC core network through the S1 interface. Fig. 9 is an adaptation process, and the specific implementation is as follows:
(1) the interface protocol adaptation module maps the mask Type in the PDU SESSION RESOURCE MODIFY RESPONSE message (NG message for short) of the NG interface to the mask Type in the S1-E-RAB SETUP RESPONSE message (S1 message for short) of the S1 interface;
(2) the interface protocol adaptation module maps AMF UE NGAP ID in NG message to MME UES1AP ID in S1 message, and as known from Table 3 and Table 4, AMF UE NGAP ID message is obtained by downlink MME UE S1AP ID message adaptation, AMF UE NGAP ID message will not exceed the value range of MME UE S1AP ID, so the value of AMF UE NGAP ID message is directly filled into MME UE S1AP ID message to realize mapping;
(3) the interface protocol adaptation module maps the RAN UE NGAP ID in the NG message to the eNB UES1AP ID in the S1 message;
(4) the interface protocol adaptation module maps the PDU Session Resource Module response transfer in the NG message to the E-RAB Setup List in the S1 message, removes the PDU data packet SDAP header in the NG message, and then packs and maps the rest SDAP SDU to the S1 interface according to the S1 load.
10. One embodiment of downstream S1 bearer and downstream PDU session adaptation
The LTE EPC core network transmits S1 bearer data to the adaptation devices and modules through an S1-U interface. The interface protocol adaptation module adapts the PDU session data message to be the 5GS NG-U interface, and transmits the PDU session data message to the 5G base station through the NG-U interface. Wherein the QFI identifier of the PDU session data message is set according to the S1 bearer identifier and the QoS attribute thereof.
When the interface protocol adaptation module receives an S1 bearer data from the S1 interface, the operation is as follows:
(1) and extracting QCI information loaded by S1, and determining a corresponding 5G 5QI value according to the mapping rule. Table 8 is the qci (QoS Class Identifier) definition of the LTE standard, and table 9 is the 5QI (5G QoS Identifier) definition of the 5G standard;
(2) extracting the data load of the message, and encapsulating the PDU session data message;
(3) expressing the 5QI value of the encapsulated PDU session data message;
(4) and sending the PDU session data message to the 5G base station through the NG.
TABLE 8 QCI definitions for LTE Standard
5QI definition of the Table 95G Standard
11. One embodiment of upstream PDU session and upstream S1 bearer adaptation
And the 5G base station transmits the PDU session data message to the adaptation device and the module through the NG-U interface. The adaptation module adapts the S1 bearer data message as an EPS S1-U interface, and transmits the S1 bearer data message to an LTE EPC core network through an S1-U interface. Wherein, the corresponding S1 load is determined according to the QFI identification of the PDU conversation data message.
When the interface protocol adaptation module receives the data message of the PDU conversation of the NG interface, the operation is as follows:
(5) extracting QFI information of the message, and determining corresponding S1 load according to the mapping rule;
(6) extracting the data load of the message, and carrying out encapsulation carried by S1;
(7) and sending the encapsulated S1 bearer data message to an LTE EPC core network through an S1-U interface.
Although the foregoing description provides some embodiments of the present invention, it is not intended to limit the scope of the present invention, and those skilled in the art may make various modifications to the embodiments without departing from the scope and spirit of the present invention, for example, the 5G terminal may be replaced by other devices, such as an internet of things sensor, an unmanned intelligent device, etc.; or a single base station architecture can be added to a multi-base station architecture to enlarge the coverage area and ensure the stability; it is also possible to combine optical fiber wired transmission with wireless transmission in the manner described above, and such modifications are within the scope of the present invention.
Claims (10)
1. An adaptation method for a 5G access network deployment, comprising:
interacting with the 5G base station through an NG interface;
interacting with an LTE EPC core network through an S1 interface;
s1 protocol messages transmitted by an LTE EPC core network through an S1 interface are adapted to NG protocol messages which can be received and identified by a 5G base station;
NG protocol messages transmitted by the 5G base station through the NG interface are adapted to S1 protocol messages which can be received and identified by an LTE EPC core network.
2. The adaptation method for a 5G access network deployment according to claim 1, characterized by: an S1 signaling message transmitted by an LTE EPC core network through an S1-C interface is adapted to be an NG signaling message of a 5GS NG-C interface and is transmitted to a 5G base station through the NG-C interface;
the EPS NAS message transmitted by the LTE EPC core network through the S1-C interface is adapted to the NAS message of the 5GS NG-C interface and is transmitted to the 5G base station through the NG-C interface; and the EPS NAS message data is not encrypted.
3. The adaptation method for a 5G access network deployment according to claim 1, characterized by: the LTE EPC core network carries data messages through S1 transmitted by an S1-U interface, is adapted to PDU session data messages of a 5GS NG-U interface, sets QFI (quad Flat interface) identification of the PDU session data messages according to S1 carrying identification and QoS (quality of service) attributes of the PDU session data messages, and then transmits the PDU session data messages to a 5G base station through the NG-U interface.
4. The adaptation method for a 5G access network deployment according to claim 1, characterized by: the NG signaling message transmitted by the 5G base station through the NG-C interface is adapted to be an S1 signaling message of an EPS S1-C interface and is transmitted to an LTEEPC core network through an S1-C interface;
the 5G base station is adapted to be an NAS message of an EPS S1-C interface through a 5GS NAS message transmitted by an NG-C interface, and is transmitted to an LTE EPC core network through an S1-C interface; and the 5GS NAS message data is not encrypted.
5. The adaptation method for a 5G access network deployment according to claim 1, characterized by: the PDU session data message transmitted by the 5G base station through the NG-U interface is adapted to an S1 bearer data message of an EPS S1-U interface, a corresponding S1 bearer is determined according to the QFI identifier of the PDU session data message, and then the S1 bearer data message is transmitted to the LTEEPC core network through the S1-U interface.
6. An adapting device deployed for a 5G access network is characterized by comprising an S1 interface module, an NG interface module and an interface protocol adapting module;
the S1 interface module comprises an S1-C interface and an S1-U interface and is used for interacting with an LTE EPC core network;
the NG interface module comprises an NG-C interface and an NG-U interface and is used for interacting with the 5G base station;
the interface protocol adaptation module is used for adapting an LTE EPC core network with a 5G base station.
7. The adaptation device for a 5G access network deployment according to claim 6, characterized by: an S1 signaling message transmitted by an LTE EPC core network through an S1-C interface is adapted to be an NG signaling message of a 5GS NG-C interface and is transmitted to a 5G base station through the NG-C interface;
the EPS NAS message transmitted by the LTE EPC core network through the S1-C interface is adapted to the NAS message of the 5GS NG-C interface and is transmitted to the 5G base station through the NG-C interface; and the EPS NAS message data is not encrypted.
8. The adaptation device for a 5G access network deployment according to claim 6, characterized by: the LTE EPC core network carries data messages through S1 transmitted by an S1-U interface, is adapted to PDU session data messages of a 5GS NG-U interface, sets QFI (quad Flat interface) identification of the PDU session data messages according to S1 carrying identification and QoS (quality of service) attributes of the PDU session data messages, and then transmits the PDU session data messages to a 5G base station through the NG-U interface.
9. The adaptation device for a 5G access network deployment according to claim 6, characterized by: the NG signaling message transmitted by the 5G base station through the NG-C interface is adapted to be an S1 signaling message of an EPS S1-C interface and is transmitted to an LTEEPC core network through an S1-C interface;
the 5G base station is adapted to be an NAS message of an EPS S1-C interface through a 5GS NAS message transmitted by an NG-C interface, and is transmitted to an LTE EPC core network through an S1-C interface; and the 5GS NAS message data is not encrypted.
10. The adaptation device for a 5G access network deployment according to claim 6, characterized by: the PDU session data message transmitted by the 5G base station through the NG-U interface is adapted to an S1 bearer data message of an EPS S1-U interface, a corresponding S1 bearer is determined according to the QFI identifier of the PDU session data message, and then the S1 bearer data message is transmitted to the LTEEPC core network through the S1-U interface.
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