CN1996914A - A system and method for network interconnection under the wireless network layer - Google Patents

Abstract

The invention discloses a system for realizing network interconnection by moving down the wireless network layer, which includes a wireless access network and a corresponding core network, and the wireless access network includes a base station network element and a base station controller; wherein, the base station The controller is set to separate control and bearer, including a wireless access network server and a base station plus a wireless adapter, which is used to move the original wireless interface protocol down to the wireless adapter of the base station; the base station plus wireless adapter is used to provide media access control , radio link control, packet data convergence protocol, cell-specific radio resource management, and switching control functions; the radio access network server is used to provide functions of migration between base stations and wireless adapters and system information broadcasting. Because the system and method of the present invention move the wireless interface protocol stack down to the base station through the wireless network, and then tightly couple or loosely couple with the OAM network, it provides an evolution path for the OAN network operator to develop the wireless network.

Description

System and method for moving wireless network layer down to realize network interconnection

technical field

The present invention relates to an interconnection system and method of a wireless optical access network, in particular to a system and method for network interconnection by moving the wireless network layer down.

Background technique

The optical fiber access network (collectively referred to as FTTx) in the prior art is divided into FTTH (Fibre To The Home), Fiber To The Building (FTTB, Fiber To The Building) and Fiber To The Curb based on the location of the Optical Network Unit (ONU). (FTTC, Fiber To The Curb) and several other situations.

The official name of OAN (Optical Access Network) is Fiber in the loop (FITL, Fiber in the loop). Due to the high bandwidth of optical access network access, it can better carry out TriplePlay, that is, transmit voice and data at the same time. Business with multimedia video. The optical fiber access network mainly adopts PON (Passive Optical Network, Passive Optical Network) technology, and now there are two mainstream mature technologies: EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network) is a technology launched in 2001 ; GPON (Gigabit Passive Optical Network, Gigabit Passive Optical Network) standard was passed by ITU in January 2003. The main network architecture of the FTTx network is shown in Figure 1, which describes the network architecture of the optical access network, and its specific OAN reference architecture is shown in Figure 2.

The entire reference architecture of the optical access network OAN is composed of the customer premise network CPN (Customer Premises Network), the access network AN (Access Network) and the service function point SNF (Service NodeFunction). Among them, in the access network, AF is Adaptation Function (Adaptation Function), which is an optional device, mainly providing ONU/ONT interface (Optical Network Unit Optical Network Unit/Optical Network Terminal Optical Network Terminal) and UNI interface (User Network Interface, user network interface) mutual conversion, AF can also be built in the ONU, so that (a) the reference point can be omitted. AF can also be placed behind the OLT (Optical Line Termination, optical path termination point) for mutual conversion between the OLT interface and the SNI interface (Service Node Interface, service point interface). AF can be regarded as the functional body of CPN and the functional body of Access Network.

The main network elements of OAN customer premises network and access network include: optical path termination point OLT, optical distribution network ODN (Optical Distribution Network, optical distribution network), optical network unit/optical network terminal ONU/ONT, and adaptation function body AF. Where T is the reference point of the UNI interface, and V is the reference point of the SNI interface. The OLT provides a network interface for the ODN and connects to one or more ODNs. ODN provides transmission means for OLT and ONU, ONU provides user-side interface for OAN and connects to ODN, user equipment CPE (Customer Premises Equipment, user end equipment) is connected to AF through UNI interface (such as: through DSL line), AF will The message format is converted from the UNI interface format to the (a) interface (such as: Ethernet link) format that can be connected to the ONU, and the ONU then converts the message into a format that can be transmitted on the ODN (such as: EPON encapsulation, GPON General framing encapsulation). Finally, the OLT converts the message into the message format of the SNI interface (such as: Ethernet link), and then accesses the service point.

A similar structure is adopted in the 3G/2G wireless communication system, which includes a radio access network (RadioAccess Network, RAN) and a core network (Core Network, CN). Among them, the wireless access network is used to handle all wireless-related functions, while the CN handles all voice calls and data connections in the wireless communication system, and realizes the switching and routing functions with the external network.

CN is logically divided into Circuit Switched Domain (CS) and Packet Switched Domain (PS). RAN, CN and mobile station (Mobile Station, MS) together constitute the entire 3G/2G wireless communication network, and its system reference architecture is shown in Figure 3.

Among them, the base station (Base Station, BS) is called the base transceiver station (Base Transceiver Station, BTS) in GSM/GPRS/CDMA/CDMA2000, and is called the node B (Node B) in WCDMA/TD-SCDMA; In WCDMA, BSC is called Radio Network Controller (Radio Network Controller, RNC); in CDMA2000, PCF (Packet Control Function), PCF is located between BSC and Packet Data Serving Node (PDSN), providing Packet data service support, as a part of the wireless access network, can be placed together with the BSC, or can be placed separately.

For WCDMA, Iu series interfaces are used in UTRAN, including Iu, Iur and Iub interfaces. These interfaces are divided into the protocol stack by the corresponding radio network layer (RNL) and transport network layer (TNL) according to the UTRAN interface general protocol model. The Iu interface is an interface connecting UTRAN and CN, and is an open standard interface. Its control plane protocol is RANAP (Radio Access Network Application Part), and its user plane protocol is GTP protocol. The Iur interface is an interface connecting RNCs, and is a unique interface of the UMTS system, and is used for mobility management of the mobile station in the RAN. For example, when performing soft handover between different RNCs, all data of the mobile station is transmitted from the working RNC to the candidate RNC through the Iur interface. Iur is also an open standard interface. The Iur interface control plane protocol is RNSAP (Radio Network Subsystem Application Part), and the user plane protocol is Iur FP. The Iub interface is an interface connecting the NodeB and the RNC. The Iub interface is also an open standard interface. The control plane protocol is NBAP, and the user plane protocol is IubFP.

Node B is the base station (that is, wireless transceiver) of the WCDMA system, including wireless transceivers and baseband processing components. Through the standard Iub interface and RNC interconnection, it mainly completes the processing of the Uu interface physical layer protocol. Its main functions are spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and also include functions such as mutual conversion of baseband signals and radio frequency signals.

The radio network controller RNC is used to control the radio resources of the UTRAN, and mainly completes functions such as connection establishment and disconnection, handover, macro-diversity combination, and radio resource management and control. Specifically include: (1) Executing system information broadcast and system access control functions; (2) Mobility management functions such as handover and RNC relocation (Relocation, or relocation); (3) Macrodiversity combining, power control, and radio bearer allocation and other wireless resource management and control functions.

The radio interface protocol stack architecture between the user equipment UE and UTRAN includes a variety of protocols, which are distributed and implemented by different nodes in the radio access network, as shown in Figure 4. Among them, the RRC protocol is implemented in the UE and the RNC. It mainly implements functions such as RRC connection management, radio bearer management, paging/broadcasting and mobility management. It is responsible for configuring the parameter information of other protocol entities in the wireless interface protocol stack. The RLC protocol is implemented in UE and RNC. It mainly implements the transmission function of user data. It provides three data transmission modes, which are suitable for transmitting service data with different QoS requirements. The MAC protocol is usually implemented in UE and RNC. It is responsible for selecting the appropriate transmission format for user data and implementing the mapping from logical channels to transport channels. For some special channel types, the NodeB also has the realization of the MAC protocol. The PDCP protocol is implemented in the UE and the RNC. Its functions include: performing header compression and decompression of the IP data stream in the sending and receiving entities, such as TCP/IP and RTP/UDP/IP header header compression methods corresponding A combination of specific network layer transport layer or upper layer protocols; user data transmission is to forward the PDCP-SDU sent by the non-access layer to the RLC layer. If the lossless SRNS migration function is supported, the forwarded PDCP-SDU and the corresponding sequence number will Different RBs are multiplexed to the same RLC entity.

The functions of BMC include: storage of cell broadcast messages; service flow monitoring and requesting radio resources for CBS; scheduling of BMC messages; sending BMC messages to UE; transmitting cell broadcast messages to higher layers (NAS), etc.

Since the Node B in the existing protocol stack only handles the physical layer protocol, once the adaptive technology that uses resource management for decision-making needs to be implemented in the RNC, the network to the terminal must go through two stages: RNC to Node B, and Node B to the terminal , and vice versa, resulting in a longer delay on the Iub interface, and reducing the processing capability of the Node B and the statistical multiplexing rate of the transmission resources of the Iub interface; and the retransmission mechanism of the RLC layer between the RNC and the UE in the Iub interface In the case of a large delay, the throughput rate will drop; and the outer loop power control algorithm cannot quickly adjust the SIRtarget according to the change of the air interface when the delay of the Iub interface is large; at the same time, the load information of the cell currently relies on NodeB to report periodically , there is an information lag, which causes the load information acquired by the RNC to be out of real time.

It can be seen that the protocol structure that puts all access layers in the RNC will not be suitable for high-speed data transmission. After adopting technologies similar to adaptive coordination and feedback control, this protocol structure cannot guarantee high speed and high efficiency, so it is difficult to To meet the needs of high-speed data transmission.

Contents of the invention

The purpose of the present invention is to provide a system and method for moving down the wireless network layer to realize network interconnection. Aiming at the subject of network interconnection of 3G/2G wireless communication network and OAN such as PON technology access, it is proposed that the wireless network integrates the wireless interface protocol The stack is moved down to the base station, and then tightly coupled or loosely coupled with the OAM network. As a wireless extension of OAM wired access, it is suitable for fixed wireless, nomadic, portable and mobile access applications, and provides OAN network operators with the development of wireless networks. an evolutionary path.

Technical scheme of the present invention comprises:

A system for moving down the wireless network layer to realize network interconnection, which includes a wireless access network and a corresponding core network, and the wireless access network includes base station network elements; wherein, the system is configured to separate control and bearer functions, It also includes a wireless access network server and a wireless adapter, which are used to move the original wireless interface protocol down to the wireless adapter of the base station;

The wireless adapter is used to provide media access control, radio link control, packet data convergence protocol, cell-specific radio resource management, and handover control functions;

The wireless access network server is used to provide functions of migration between the base station and the wireless adapter and broadcasting of system information.

In the system described above, the base station and the wireless adapter network element are integrated into a base station plus a wireless adapter network element.

The system further includes: decomposing the control and bearer separation functions of the packet switching domain of the core network, and defining functional units including:

Serving GPRS Supporting Node Server, Serving GPRS Supporting Node Gateway, Gateway GPRS Supporting Node Server and Gateway GPRS Supporting Node Gateway;

The serving GPRS support node server includes the control plane function of SGSN, which is used to realize the control plane functions of mobility management, connection management and session management;

The serving GPRS support node gateway includes a user plane function of the SGSN;

The gateway GPRS support node server includes the control plane function of GGSN;

The gateway GPRS support node gateway includes the user plane function of the GGSN.

The system, wherein, in the core network, the interface between the serving GPRS support node gateway and the base station plus the wireless adapter adopts the user plane of the interface Iu; between the serving GPRS support node server and the wireless access network server The interface adopts the control plane of the interface Iu.

Described system, wherein, the interface between described service GPRS support node gateway and gateway GPRS support node gateway adopts the user plane of interface Gn; The interface between described service GPRS support node server and described gateway GPRS support node server adopts interface Control surface of Gn.

Described system, wherein, the interface between described service GPRS support node server and service GPRS support node gateway adopts the Megaco of IETF or the H.248 of ITU-T, or adopts brand-new protocol stack, and described service GPRS support node server Manage the service GPRS support node gateway through Megaco/H.248.

Described system, wherein, the interface between described gateway GPRS support node server and described gateway GPRS support node gateway adopts the Megaco of IETF or the H.248 of ITU-T, or adopts brand-new protocol stack, and described gateway GPRS supports The node server manages the gateway GPRS support node gateway through Megaco/H.248.

The system further includes: performing control and bearer separation function decomposition on the PS domain of the core network, and defining functional units including:

Integrated GPRS support node server and integrated GPRS support node gateway;

The integrated GPRS support node server includes control plane functions of the original SGSN and GGSN, and the integrated GPRS support node gateway includes user plane functions of the original SGSN and GGSN.

The system, wherein, in the core network, the interface between the integrated GPRS support node gateway and the base station plus the wireless adapter adopts the user plane of the interface Iu;

The interface between the integrated GPRS support node server and the wireless access network server adopts the control plane of the interface Iu.

Described system, wherein, the interface between described gateway GPRS support node server and gateway GPRS support node gateway adopts the Megaco of IETF or the H.248 of ITU-T, or adopts brand-new protocol stack; Described gateway GPRS supports node server Manage the gateway GPRS support node gateway through Megaco/H.248.

A method for moving down the wireless network layer to realize network interconnection, comprising: interconnecting a wireless communication network base station and a wireless adapter with a reference point a of an optical access network in the optical access network through an adaptation function body, and the wireless communication network The wireless access network server and the core network are interconnected with the reference point v of the optical path termination point in the optical access network, so as to realize the interconnection between the optical network and the wireless communication network.

The method, wherein the base station and the wireless adapter network element are integrated, the base station plus wireless adapter integrated network element is separated from the adaptation function body network element, and are interconnected by a reference point T;

Alternatively, the base station is integrated with the wireless adapter network element and the adaptation function body network element, and is interconnected with the reference point a of the optical network unit/optical network terminal in the optical access network.

Said method, wherein, the wireless access network server can be integrated with the optical path termination point network element.

The method, which also includes enabling the compression/decompression function, and the transmission process of the user plane data at this time includes:

uplink:

A1. The application layer data of the user equipment is encapsulated into IP packets or PPP packets and sent to the PDCP protocol of the wireless network layer. The PDCP protocol compresses the header of the data packet and transmits the compressed data to the RLC/MAC of the wireless network layer. ;

B1, the RLC/MAC protocol, after receiving the data packet and processing it, increases the RLC/MAC header and sends it to the WCDMA physical layer, and the physical layer encodes and modulates the received data packet and sends it to the UTRAN through the Uu interface;

C1, in the UTRAN, the WCDMA physical layer of the base station plus the wireless adapter sends the media access control/radio link control protocol to the wireless network layer after receiving the data;

D1, the MAC/RLC protocol removes the protocol header in turn, after reorganization and merging, the data is sent to the packet data aggregation protocol of the wireless network layer, and the compressed data packet header is decompressed;

E1. The base station plus the wireless adapter forwards the decrypted data to the core network through the corresponding interface through the GPRS tunneling protocol tunnel.

Said method, wherein, the corresponding interface GPRS tunnel protocol, UDP and IP between the wireless adapter and the core network can be directly carried on the optical access network.

The method, wherein, the step E1 also includes:

E11, the base station plus the wireless adapter divides the GPRS tunneling protocol/UDP/IP packet into data link frames, and carries the physical layer between the node B and the adaptation function body and sends it to the adaptation function body;

E12. The adaptation function body converts the data link frame into an optical network unit data link frame, and carries the physical layer between the optical network unit/optical network terminal and the adaptation function body and sends it to the optical network unit/optical network terminal ;

E13. The optical network unit/optical network terminal converts the data link frame of the optical network unit/optical network terminal into an optical distribution network data link frame suitable for optical transmission, and performs electro-optical conversion and bears it on the physical layer of the optical distribution network. The optical fiber is sent to the end point of the optical path;

E14. The physical layer of the optical path termination point performs photoelectric conversion to obtain the data link frame of the optical distribution network, and then converts the data link frame of the optical distribution network into a data link frame and sends it to the core network for further processing.

Said method, wherein said step E1 also includes the step of core network:

F1, the SGSN/serving GPRS support node gateway does the transmission network layer and wireless network layer processing of the corresponding interface, receives data from the GPRS tunnel protocol tunnel of this interface and sends it to the Gn/Gn-D interface through the GPRS tunnel protocol tunnel GGSN/Gateway GPRS support node gateway;

G1, GGSN/Gateway GPRS supports node gateway to send to the external network through the corresponding interface in the form of IP packet or PPP protocol packet.

Said method, wherein said step E1 also includes the step of core network:

F2. The IGSN/integrated GPRS support node gateway performs the transmission network layer and wireless network layer processing of the corresponding interface, and the data received from the GPRS tunnel protocol tunnel of the interface is the IP packet or PPP packet of the UE;

G2. The IGSN/integrated GPRS support node gateway sends the IP packet or PPP protocol packet to the external network.

The method, wherein the transmission process of the control plane signaling includes:

uplink:

A2. The radio resource control of the user equipment encapsulates the short message or the signaling message of this layer into a data packet and transmits it to the RLC/MAC of the wireless network layer;

B2, described RLC/MAC agreement after receiving data packet processing, send to WCDMA physical layer after adding RLC/MAC header, physical layer carries out operations such as code modulation to received data packet and sends to UTRAN through Uu interface;

C2. The WCDMA physical layer of the base station and wireless adapter in UTRAN sends the data to the MAC/RLC protocol of the wireless network layer after receiving the data;

D2. The MAC/RLC protocol sequentially removes protocol headers, recombines and sends the data to the radio resource control protocol of the wireless network layer. The radio resource control protocol usually directly parses the signaling message and performs corresponding processing.

The method, wherein, for the migration between the base station and the wireless adapter, multi-cell radio resource management, system information broadcast, paging control, and the forwarding function of the radio access network application part/radio network subsystem application part message, the The wireless resource control of the base station plus the wireless adapter directly transmits the corresponding signaling message through its corresponding interface wireless network layer and transport network layer, and notifies the wireless resource control layer of the wireless access network server of the processing result, and then through the wireless access network server The wireless network layer and transmission network layer of the corresponding interface are transferred to the core network for processing.

The method, wherein, the radio resource control, radio network layer and transport network layer of the interface between the wireless adapter and the radio access network server are directly carried on the optical access network.

The method, wherein the method also includes:

E21. The base station plus the wireless adapter divides the FP/IP or NBAP/SCTP/IP packet into a data link frame, and carries the physical layer between the node B and the adaptation function body and sends it to the adaptation function body;

E22. The adaptation function body converts the data link frame into an optical network unit data link frame, and carries the physical layer between the optical network unit/optical network terminal and the adaptation function body and sends it to the optical network unit/optical network terminal ;

E23. The optical network unit/optical network terminal converts the data link frame of the optical network unit/optical network terminal into an optical distribution network data link frame suitable for optical transmission, and performs electro-optical conversion and bears it on the physical layer of the optical distribution network. The optical fiber is sent to the end point of the optical path;

E24. The physical layer of the optical path termination point performs photoelectric conversion to obtain the data link frame of the optical distribution network, and then converts the data link frame of the optical distribution network into a data link frame and sends it to the core network for further processing.

The method, wherein, in the core network, IGSN/SGSN/IGSN-Server/SGSN-Server performs Iu-C interface transmission network layer and wireless network layer processing, and obtains short messages from the application part of the wireless access network.

The method described above, wherein the optical access network between the wireless adapter and the core network adopts layer 2 bridging technology, that is, the adaptation function body, optical network unit/optical network terminal, and optical path termination point are all layer 2 network elements.

The method, wherein, the wireless adapter and the core network adopt a three-layer routing technology, that is, the adaptation function body, the optical network unit/optical network terminal and the optical path termination point are all three-layer network elements.

A method for moving down the wireless network layer to realize network interconnection, comprising: interconnecting a base station and a wireless adapter of a wireless communication network with an optical access network broadband network at an optical distribution network through an optical network unit or an optical network terminal, and wireless communication The wireless access network server and the core network of the network are interconnected with the reference point v of the optical path termination point in the optical access network, so as to realize the interconnection between the optical network and the wireless communication network.

The method described above, wherein the base station and the wireless adapter network element are integrated, the base station plus the wireless adapter integrated network element is separated from the optical network unit or the optical network terminal network element, and are interconnected by reference point a,

Alternatively, the base station and the wireless adapter network element are integrated with the optical network unit or the optical network terminal network element, and are interconnected with the optical access network at the optical distribution network.

Said method, wherein, the wireless access network server can be integrated with the optical path termination point network element.

The method, wherein, after the compression/decompression function is enabled, the transmission process of the user plane data includes:

uplink:

A3. The application layer data of the user equipment is encapsulated into IP packets or PPP packets and sent to the PDCP protocol of the wireless network layer. The PDCP protocol compresses the header of the data packet and transmits the compressed data to the RLC/MAC of the wireless network layer. ;

B3, described RLC/MAC protocol is sent to WCDMA physical layer after receiving data packet processing, increases RLC/MAC header, and physical layer carries out operations such as code modulation to received data packet and sends to UTRAN through Uu interface;

C3, the WCDMA physical layer in the UTRAN sends the MAC/RLC protocol to the wireless network layer after receiving the data, and the MAC/RLC protocol removes the protocol header in turn, and after reorganization and merging, the data is sent to the PDCP protocol of the wireless network layer;

D3. The PDCP protocol decompresses the compressed data packet header, and forwards the decompressed data to the core network through the corresponding interface through the GPRS tunneling protocol tunnel.

Said method, wherein, the interface GPRS tunnel protocol, UDP and IP between the wireless adapter and the core network are directly carried on the optical access network.

The method, wherein, the base station plus the wireless adapter divides the GPRS tunneling protocol/UDP/IP packet into an optical distribution network data link frame suitable for optical transmission, and carries out electro-optic conversion on the physical layer of the optical distribution network, through the optical fiber Send to the optical path termination point; the physical layer of the optical path termination point performs photoelectric conversion to obtain the optical distribution network data link frame, and then converts the optical distribution network data link frame into a data link frame and sends it to the core network for further processing.

The method, wherein, in the core network, SGSN/SGSN-GW performs the transmission network layer and wireless network layer processing of the corresponding interface, receives data from the GPRS tunneling protocol tunnel and passes through the Gn/Gn using the GPRS tunneling protocol tunnel -D interface sent to GGSN/GGSN-GW;

The GGSN/GGSN-GW sends the packets to the external network through the Gi interface in the form of IP packets or PPP protocol packets.

Described method, wherein, IGSN/IGSN-GW is done the transmission network layer of Iu-D interface and wireless network layer processing, receives the IP bag or PPP bag of user equipment from the GPRS tunneling protocol tunnel of Iu-D interface;

The IGSN/IGSN-GW then sends it to the external network in the form of an IP packet or a PPP protocol packet.

The method, wherein the transmission process of the control plane signaling includes:

uplink:

A4. The radio resource control of the user equipment encapsulates the short message or the signaling message of this layer into a data packet and transmits it to the RLC/MAC of the wireless network layer;

B4. After the RLC/MAC protocol receives the data packet and processes it, it adds the RLC/MAC header and sends it to the WCDMA physical layer. The physical layer encodes and modulates the received data packet and sends it to UTRAN through the Uu interface;

C4. After the WCDMA physical layer in UTRAN receives the data, it sends it to the MAC/RLC protocol of the wireless network layer. The MAC/RLC protocol removes the protocol header in turn, and after reorganization and merging, sends the data to the radio resource control protocol of the wireless network layer;

D4. The radio resource control protocol parses the signaling message and performs corresponding processing.

Described method, wherein, its base station adds the wireless adapter and divides the FP/IP or NBAP/SCTP/IP packet of corresponding interface into the optical distribution network data link frame suitable for optical transmission; Layer, sent to the optical path termination point through the optical fiber; the optical path termination point physical layer performs photoelectric conversion to obtain the optical distribution network data link frame, and then converts the optical distribution network data link frame into a data link frame and sends it to the wireless access network server.

The method, wherein, the radio access network server processes the transport network layer and the wireless network layer of the corresponding interface, obtains the RNL frame for radio resource control, sends it to the MAC/RLC protocol of the RNL, and removes the MAC/RLC protocol in turn The protocol header, after reorganization and merging, sends the data to the radio resource control, and the radio resource control protocol decompresses the compressed data packet header to obtain the data packet, and then processes the data packet through the wireless network layer and the transmission network layer of the corresponding interface to the core network.

The method, wherein, in the core network, the IGSN/SGSN/IGSN-Server/SGSN-Server performs corresponding interface transmission network layer and wireless network layer processing, and obtains short messages from the application part of the wireless access network.

The method described above, wherein the optical access network between the wireless adapter and the core network adopts a Layer 2 bridging technology, that is, the termination point of the optical path is a Layer 2 network element.

The method, wherein, the wireless adapter and the core network adopt a three-layer routing technology, that is, the optical path is a three-layer network element.

A system and method for moving down the wireless network layer to realize network interconnection provided by the present invention, because the wireless interface protocol stack is moved down to the base station through the wireless network, and then tightly coupled or loosely coupled with the OAM network, as an OAM wired The wireless extension of access is suitable for fixed wireless, nomadic, portable and mobile access applications, and provides an evolution path for OAN network operators to develop wireless networks.

Description of drawings

FIG. 1 is a schematic diagram of a main network architecture of an FTTx network in the prior art;

FIG. 2 is a schematic diagram of a reference architecture of an optical access network OAN in the prior art;

FIG. 3 is a schematic diagram of an access network reference architecture of a 3G/2G communication system in the prior art;

FIG. 4 is a schematic diagram of a wireless interface protocol stack architecture in the prior art;

5 is a schematic diagram of an enhanced mobile network architecture in which the wireless interface function of the system of the present invention is moved down;

Figure 6 (a)-(c) is a schematic diagram of the enhanced mobile network interface protocol stack with the wireless interface function downshifted in the present invention; wherein, (a) is the structure of the enhanced mobile network user plane with the wireless interface function downshifted in the system of the present invention Schematic diagram; (b) is the structural representation of the enhanced mobile network control plane that the wireless interface function of the system of the present invention moves down; (c) is the Megaco/H.248 protocol stack schematic diagram based on IP of the system of the present invention;

7 is a schematic diagram of an enhanced mobile network architecture in which the wireless interface function is downshifted in the first embodiment of the system of the present invention;

FIG. 8 is a schematic diagram of an enhanced mobile network architecture in which the wireless interface function is moved down according to the second embodiment of the system of the present invention;

FIG. 9 is a schematic structural diagram of the interconnection between the optical access network and the wireless network in the first preferred embodiment of the method of the present invention;

Fig. 10 is a schematic diagram of the user plane in the network interconnection solution of the first preferred embodiment of the method of the present invention: when the BS+WA integrated network element and the AF network element are separated;

11 is a schematic diagram of the integration of user plane BS, WA and AF network elements in the network interconnection solution of the first preferred embodiment of the method of the present invention;

12 is a schematic diagram of the control plane in the network interconnection solution of the second preferred embodiment of the method of the present invention: when the BS+WA integrated network element and the AF network element are separated;

Fig. 13 is a schematic diagram of the user plane in the network interconnection scheme of the second preferred embodiment of the method of the present invention: when BS, WA and AF network elements are integrated;

Fig. 14 is a schematic diagram of the interconnection scheme between the optical access network OAN and the wireless network in the second preferred embodiment of the method of the present invention;

Fig. 15 is a user plane in the network interconnection solution in the second preferred embodiment of the method of the present invention: a schematic diagram of the architecture of BS, WA and ONU/ONT network element integration;

Fig. 16 is a schematic diagram of the control plane in the network interconnection solution in the second preferred embodiment of the method of the present invention: BS, WA and ONU/ONT network element integration architecture.

Detailed ways

Various preferred embodiments of the present invention will be described in more detail below in conjunction with the accompanying drawings.

The system and method for realizing network interconnection by moving the wireless network layer down according to the present invention, decomposes the functions of the wireless access network RAN, and defines functional units: BS, wireless adapter WA (Wireless Adaptor) and wireless access network server (RAN- Server); where the functions of BS, WA and RAN-Server are divided as follows:

For the RAN of the WCDMA/GPRS/TD-SCDMA network, the functional decomposition of BS, WA and RAN-Server is shown in Table 1, and the WA function can be moved down to the BS.

Table 1 Functional breakdown of BS, WA and RWG

Function BS WA (Move down function) RAN-Server PHY required Media Access Control MAC required Radio Link Control RLC required Broadcast Multicast Control BMC optional Packet Data Convergence Protocol PDCP required Radio Resource Control RRC ·Multi-cell wireless resource management optional

Manage MC-RRM · Cell dedicated radio resource management CS-RRM required · System Information Broadcast BroadcastDistribution required ·Switch control HO Control required · Paging Control PagingControl optional ·Admission Control optional ·CellControl in the cell optional ·Multi-cell control optional Migration Control RelocationControl required QoS scheduling optional RANAP message forwarding optional RNSAP message forwarding optional Handover control between wired access and wireless access optional

The core idea of the present invention is to separate the control and bearer functions of the base station controller (such as RNC), and the functions are decomposed into two network elements—the radio access network server RAN-Server and the base station plus wireless adapter BS+WA, and the original Some wireless interface protocols such as RRC, PDCP/BMC/RLC/MAC of the RNL protocol stack are moved down to the base station such as the WA of the node BNode B, and the main function of the RAN-Server is to provide migration between BS+WA and multi-cell wireless Functions such as resource management, system information broadcast, paging control, and forwarding of current RANAP/RNSAP messages; in addition, RAN-Server also includes the function of switching control between wired access and wireless access to support wired access and Control of switching between wireless accesses. A one-to-many or many-to-many connection relationship is adopted between RAN-Server and BS+WA.

The new wireless network architecture of the present invention is shown in Figure 5, the interface between UE network element and BS+WA network element adopts original UE and UTRAN interface Uu, the Iub interface between Node B and RNC no longer exists; BS+WA network The newly defined interface Iub-C is adopted between Yuan and RAN-Server; the interface Iu-D between BS+WA and CN adopts the user plane of the interface Iu between the original RNC and SGSN; the interface Iu-C between RAN-Server and CN The control plane of the interface Iu between the original RNC and SGSN is used; the control plane of the Iur interface between the original RNCs is used between RAN-Server; and the interface between the added BS+WA network elements adopts the Iur interface between the original RNCs. The definition of the enhanced mobile network interface and its protocol stack with the function of the wireless interface moved down are shown in Figure 6.

The present invention further decomposes the control and bearer separation functions of the CN PS domain. A functional decomposition method is to define functional units: serving GPRS support node server SGSN-Server, serving GPRS support node gateway SGSN-GW, gateway GPRS support node server GGSN- Server and gateway GPRS support node gateway GGSN-GW. SGSN-Server includes the control plane functions of the original SGSN, and implements SGSN control plane functions such as mobility management, connection management, and session management. SGSN-GW includes the user plane functions of the original SGSN, and GGSN-Server includes the control plane functions of the original GGSN. GGSN -GW includes the user plane function of the original GGSN.

Correspondingly, the new wireless network architecture of the present invention is shown in FIG. 7 . Among them, the RAN is the same as the RAN in Figure 5; in the CN, the interface Iu-D between the SGSN-GW and the BS+WA adopts the user plane of the interface Iu between the original RNC and the SGSN; the interface Iu between the SGSN-Server and the RAN-Server -C adopts the control plane of the interface Iu between the original RNC and the SGSN; the interface Gn-D between the SGSN-GW and the GGSN-GW adopts the user plane of the interface Gn between the original GGSN and the SGSN; the interface between the SGSN-Server and the GGSN-Server The interface Gn-C adopts the control plane of the interface Gn between the original GGSN and SGSN; the interface between the SGSN-Server and SGSN-GW adopts Megaco of IETF or H.248 of ITU-T, or a new protocol stack, SGSN- Server manages SGSN-GW through Megaco/H.248; the interface between GGSN-Server and GGSN-GW adopts Megaco of IETF or H.248 of ITU-T, or adopts a new protocol stack. GGSN-Server uses Megaco /H.248 manages the GGSN-GW, as shown in Figure 6(c).

In the second preferred embodiment of the present invention, the CN PS domain function decomposition method is to define functional units: integrated GPRS support node server IGSN-Server and integrated GPRS support node gateway IGSN-GW. The IGSN-Server includes the control plane functions of the original SGSN and GGSN, and the IGSN-GW includes the user plane functions of the original SGSN and GGSN.

Correspondingly, the new wireless network architecture of the present invention is shown in FIG. 8 . Among them, the RAN is the same as the RAN in Figure 5; in the CN, the interface Iu-D between the IGSN-GW and the BS+WA adopts the user plane of the interface Iu between the original RNC and the SGSN; the interface Iu between the IGSN-Server and the RAN-Server -C adopts the control plane of the interface Iu between the original RNC and SGSN; the interface between IGSN-Server and IGSN-GW adopts Megaco of IETF or H.248 of ITU-T, and can also adopt a new protocol stack. IGSN-Server passes Megaco/H.248 manages the IGSN-GW.

Thus, the first preferred embodiment of the method for interconnecting the optical access network OAN and the wireless network of the present invention is shown in FIG. 9 , the reference point (a ) interconnection, the RAN-Server and CN are interconnected with the reference point v of the OLT in the OAN. This solution can make the construction of 3G/2G access network use the resources already deployed by the original OAN as much as possible. For example, the operator already has a FTTB/FTTC network, and the 3G/2G wireless communication network equipment is installed in the building and directly uses the copper wire of the building. Resources are connected to the OAN network through the ONU, thereby reducing the extra wiring of the wireless communication network. Thereby reducing the construction cost of the 3G/2G access network, which belongs to the tightly coupled scheme.

In this solution, BS and WA network elements are integrated, BS+WA integrated network elements and AF can be separated and interconnected with a reference point T; or BS, WA and AF network elements can be integrated into one. RAN-Server can be integrated with OLT network elements.

Taking WCDMA as an example, the protocol stack under the UE->Node B->ONU->OLT->Core Network path, the user plane is shown in Figure 10 and Figure 11, and the control plane is shown in Figure 12 and Figure 13. The functional decomposition of BS, WA and RAN-Server is shown in Table 1; Core Network includes SGSN and GGSN; SGSN and GGSN can also be combined into one to form a new network element IGSN; Core Network can also be as shown in Figure 7 and Figure 8 scheme.

Based on the above protocol stack structure, the UE first establishes a radio resource control RRC connection through the control plane protocol stack during data communication, and starts to establish an RAB after negotiating with the core network. The RAB establishment process is accompanied by the establishment of the user plane RB. After the RAB is successfully established, the user can transmit data through the established user plane bearer. The compression/decompression function of PDCP can be enabled or disabled. The signaling establishment process is that after the RRC connection between the UE and UTRAN is successfully established, the UE establishes a signaling connection with the CN through the RNC, also called "NAS signaling establishment process", which is used for the signaling exchange of NAS information between the UE and the CN. , such as authentication, service request, connection establishment, etc. A transmission process of user plane data with the compression/decompression function enabled is as follows:

Uplink: UE's application layer data is encapsulated into IP packets or PPP packets and sent to RNL's PDCP protocol. PDCP protocol compresses the data packet header and transmits the compressed data to RNL's RLC/MAC, RLC/MAC protocol After the received data packet is processed, the RLC/MAC header is added and then sent to the WCDMA physical layer RFL. The physical layer encodes and modulates the received data packet and sends it to UTRAN through the Uu interface. The WCDMA physical layer RFL of BS+WA in UTRAN sends the data to the MAC/RLC protocol of RNL after receiving the data. The MAC/RLC protocol removes the protocol header in turn, and after reorganization and merger, the data is sent to the PDCP protocol of RNL. The PDCP protocol will be compressed The header of the packet is decompressed. BS+WA forwards the decrypted data to CN through the Iu-D interface through the GTP tunnel. The Iu-D interface GTP tunnel protocol, UDP and IP between WA and CN can be directly carried on the OAN network, and the OAN between WA and CN The network can adopt layer-2 bridging technology (for example, Ethernet bridging), that is, AF, ONU/ONT and OLT are all layer-2 network elements; or use layer-3 routing technology between WA and CN (for example, IP layer-3 routing), That is, AF, ONU/ONT, and OLT are all three-layer network elements.

BS+WA divides GTP/UDP/IP packets into LNK frames, and then carries them on the physical layer between Node B and AF and sends them to AF; AF converts LNK frames into ONU LNK frames, and then carries them on the physical layer between ONU/ONT and AF Send to ONU/ONT; ONU/ONT converts ONU/ONT LNK frames into ODN LNK frames suitable for optical transmission, and then carries out electro-optical conversion on the ODN physical layer, and sends them to OLT through optical fiber; OLTPHY performs photoelectric conversion to obtain ODN LNK frames, Then convert the ODN LNK frame into an LNK frame and send it to CN for further processing.

In CN, SGSN/SGSN-GW performs the transmission network layer and wireless network layer processing of the Iu-D interface, receives data from the GTP tunnel of the Iu-D interface and sends it to the GGSN/GGSN through the Gn/Gn-D interface through the GTP tunnel -GW. The data received by the GGSN/GGSN-GW from the GTP tunnel of the Gn/Gn-D interface is the IP packet or PPP packet of the UE, and the GGSN/GGSN-GW sends the IP packet or PPP protocol packet to the external network through the Gi interface ; Or, IGSN/IGSN-GW performs the transmission network layer and wireless network layer processing of the Iu-D interface, and the data received from the GTP tunnel of the Iu-d interface is the IP packet or PPP packet of the UE, and the IGSN/IGSN-GW then It is sent to the external network in the form of IP packets or PPP protocol packets.

The downlink is similar to the uplink, except that the PDCP protocol in the BS+WA is responsible for compressing the header of the downlink data, while the PDCP protocol in the UE is responsible for decompressing the header of the downlink data.

The transmission process of the control plane signaling in this embodiment of the present invention is as follows:

Uplink: UE's RRC encapsulates GMM/SM/SMS messages or signaling messages of this layer into data packets and sends them to RNL's RLC/MAC. After the RLC/MAC protocol receives and processes the data packets, it adds the RLC/MAC header Afterwards, it is sent to the WCDMA physical layer RFL, and the physical layer encodes and modulates the received data packets and sends them to UTRAN through the Uu interface. The WCDMA physical layer RFL of BS+WA in UTRAN sends the data to the MAC/RLC protocol of RNL after receiving the data. The MAC/RLC protocol removes the protocol header in turn, and after reorganization and merger, the data is sent to the RRC protocol of RNL. The RRC protocol is usually directly parsed. Signaling messages are processed accordingly, such as connection establishment, measurement reports, etc.

However, for functions such as migration between BS+WA, multi-cell radio resource management, system information broadcast, paging control, and forwarding of RANAP/RNSAP messages, the RRC of BS+WA will directly pass the corresponding signaling message through Iub-C The interface wireless network layer (such as FP) and transport network layer (such as IP/LNK/PHY) carry the RRC layer that notifies the processing result to the RAN-Server, and then passes the wireless network layer (such as NANAP) of the Iu-C interface through the RAN-Server And the transmission network layer (such as SCCP/M3UA/SCTP/IP/LNK/PHY, where M3UA/SCTP/IP is the signaling bearer layer Signaling Bearer in the figure) is transferred to the CN for processing. The RRC, wireless network layer (such as FP or NBAP) and transmission network layer (such as IP layer or signaling bearer layer SignalingBearer (such as SCTP/IP)) of the Iub-C interface between WA and RAN-Server can be directly carried on the OAN network Above, the OAN network between WA and RAN-Server can use Layer 2 bridging technology (for example, Ethernet bridging), that is, AF, ONU/ONT and OLT are all Layer 2 network elements; or between WA and RAN-Server using three Layer routing technology (for example, IP layer 3 routing), that is, AF, ONU/ONT and OLT are all layer 3 network elements.

BS+WA divides the FP/IP or NBAP/SCTP/IP packets of the Iub-C interface into LNK frames, and then sends them to AF at the physical layer between Node B and AF; AF converts LNK frames into ONU LNK frames, and then carries them The physical layer between ONU/ONT and AF is sent to ONU/ONT; ONU/ONT converts the ONU/ONTLNK frame into an ODN LNK frame suitable for optical transmission, and then performs electro-optical conversion and bears it on the ODN physical layer, and sends it to the OLT through the optical fiber; OLT The PHY performs photoelectric conversion to obtain the ODN LNK frame, and then converts the ODNLNK frame into an LNK frame and sends it to the RAN-Server for further processing. RAN-Server handles the transmission network layer and wireless network layer of the Iub-C interface, obtains the RNL frame of RRC from FP, and sends it to the MAC/RLC protocol of RNL. The data is sent to RRC, and the RRC protocol decompresses the compressed data packet header to obtain the data packet, and then the data packet is sent to the network element of the CN through the wireless network layer and the transmission network layer of the Iu-C interface.

In CN, IGSN/SGSN/IGSN-Server/SGSN-Server performs Iu-C interface transmission network layer and wireless network layer processing, and obtains GMM/SM/SMS messages from RANAP.

Similarly, the UE receives the signaling message of the core network and the RRC signaling message of the access network through the reverse process. In the above-mentioned protocol stack processing model, the RRC layer is implemented by the RAN-Server and the base station respectively. In view of the different functions in the RRC, functions such as fast connection establishment, fast feedback, and resource scheduling are implemented in the base station, and similar to some data management , data storage, and content that needs to deal with multiple base stations are implemented in the RAN-Server.

The second embodiment of the method for interconnecting the optical access network OAN and the wireless network of the present invention, as shown in FIG. It is interconnected with the reference point v of the OLT in the OAN, which belongs to the tight coupling scheme. The 3G/2G wireless communication network directly utilizes the optical network resources of OAN. For example, the operator already has an FTTH network, and the WiMAX equipment is installed in the building to directly connect to the ODN network. The solution BS+WA integrates the functions of ONU/ONT, and RAN-Server can be integrated with OLT network elements.

Taking WCDMA as an example, the protocol stack under the UE->Node B->ONU->OLT->Core Network path, the user plane is shown in Figure 15, and the control plane is shown in Figure 16. The functional decomposition of BS, WA and RAN-Server is shown in Table 1; Core Network includes SGSN and GGSN; SGSN and GGSN can also be combined into one to form a new network element IGSN; CoreNetwork can also be as shown in Figure 7 and Figure 8 plan.

The transmission process of the user plane data with the compression/decompression function enabled by the method of the present invention is as follows:

Uplink: UE's application layer data is encapsulated into IP packets or PPP packets and sent to RNL's PDCP protocol. PDCP protocol compresses the data packet header and transmits the compressed data to RNL's RLC/MAC, RLC/MAC protocol After the received data packet is processed, the RLC/MAC header is added and then sent to the WCDMA physical layer RFL. The physical layer encodes and modulates the received data packet and sends it to UTRAN through the Uu interface. The WCDMA physical layer RFL of BS+WA+ONU/ONT in UTRAN sends the data to the MAC/RLC protocol of RNL after receiving the data. The MAC/RLC protocol removes the protocol header in turn, and after reorganization and merger, sends the data to the PDCP protocol of RNL. PDCP The protocol decompresses compressed packet headers. BS+WA+ONU/ONT forwards the decoded data to CN through the Iu-D interface through the GTP tunnel. The Iu-D interface GTP tunnel protocol, UDP and IP between WA and CN can be directly carried on the OAN network. WA The OAN network between the CN and the CN can adopt a layer-2 bridging technology (for example, Ethernet bridging), that is, the OLT is a layer-2 network element; or a layer-3 routing technology (for example, IP layer-3 routing) is used between the WA and CN, that is, the OLT is a Layer 3 network element.

BS+WA+ONU/ONT divides GTP/UDP/IP packets into ODN LNK frames suitable for optical transmission, and then carries out electro-optical conversion on the ODN physical layer, and sends them to OLT through optical fiber; OLT PHY performs photoelectric conversion to obtain ODN LNK frames, Then convert the ODN LNK frame into an LNK frame and send it to CN for further processing.

In CN, SGSN/SGSN-GW performs the transmission network layer and wireless network layer processing of the Iu-D interface, receives data from the GTP tunnel of the Iu-D interface and sends it to the GGSN/GGSN through the Gn/Gn-D interface through the GTP tunnel -GW. The data received by the GGSN/GGSN-GW from the GTP tunnel of the Gn/Gn-D interface is the IP packet or PPP packet of the UE, and the GGSN/GGSN-GW sends the IP packet or PPP protocol packet to the external network through the Gi interface ; Or, IGSN/IGSN-GW performs the transmission network layer and wireless network layer processing of the Iu-D interface, and the data received from the GTP tunnel of the Iu-D interface is the IP packet or PPP packet of the UE, and the IGSN/IGSN-GW then It is sent to the external network in the form of IP packets or PPP protocol packets.

Downlink is similar to uplink, except that the PDCP protocol in BS+WA+ONU/ONT is responsible for compressing the header of downlink data, while the PDCP protocol in UE is responsible for decompressing the header of downlink data.

The transmission process of the control plane signaling in the second embodiment of the present invention as shown in FIG. 16 includes:

Uplink: UE's RRC encapsulates GMM/SM/SMS messages or signaling messages of this layer into data packets and sends them to RNL's RLC/MAC. After the RLC/MAC protocol receives and processes the data packets, it adds the RLC/MAC header Afterwards, it is sent to the WCDMA physical layer RFL, and the physical layer encodes and modulates the received data packets and sends them to UTRAN through the Uu interface. The WCDMA physical layer RFL of BS+WA+ONU/ONT in UTRAN sends the data to the MAC/RLC protocol of RNL after receiving the data. The MAC/RLC protocol removes the protocol header in turn, and after reorganization and merger, the data is sent to the RRC protocol of RNL. RRC The protocol usually directly parses the signaling message and performs corresponding processing, such as connection establishment and measurement report. However, for functions such as migration between BS+WA+ONU/ONT, multi-cell radio resource management, system information broadcast, paging control, and forwarding of existing RANAP/RNSAP messages, the RRC of BS+WA+ONU/ONT will directly transfer The corresponding signaling message is carried by the wireless network layer (such as FP) and the transmission network layer (such as IP/LNK/PHY) of the Iub-C interface to notify the RRC layer of the RAN-Server of the processing result, and then through the RAN-Server through the Iu-C The wireless network layer (such as NANAP) and transmission network layer (such as SCCP/M3UA/SCTP/IP/LNK/PHY, where M3UA/SCTP/IP is the Signaling Bearer in the figure) of the interface are transferred to the CN for processing. The RRC, wireless network layer (such as FP or NBAP) and transmission network layer (such as IP layer or signaling bearer layer Signaling Bearer (such as SCTP/IP)) of the Iub-C interface between WA and RAN-Server can be directly carried on the OAN On the network, the OAN network between WA and RAN-Server can adopt Layer 2 bridging technology (for example, Ethernet bridging), that is, OLT is a Layer 2 network element; or use Layer 3 routing technology between WA and RAN-Server (for example, IP Layer 3 routing), that is, the OLT is a Layer 3 network element.

BS+WA divides the FP/IP or NBAP/SCTP/IP packets of the Iub-C interface into ODN LNK frames suitable for optical transmission, and then carries out electro-optical conversion and bears them on the ODN physical layer, and sends them to the OLT through optical fibers; OLTPHY performs photoelectric conversion to obtain ODN LNK frame, and then convert the ODN LNK frame to LNK frame and send it to RAN-Server for further processing. RAN-Server handles the transmission network layer and wireless network layer of the Iub-C interface, obtains the RNL frame of RRC from FP, and sends it to the MAC/RLC protocol of RNL. The data is sent to RRC, and the RRC protocol decompresses the compressed data packet header to obtain the data packet, and then the data packet is sent to the network element of the CN through the wireless network layer and the transmission network layer of the Iu-C interface.

In CN, IGSN/SGSN/IGSN-Server/SGSN-Server performs Iu-C interface transmission network layer and wireless network layer processing, and obtains GMM/SM/SMS messages from RANAP.

Similarly, the UE receives the signaling message of the core network and the RRC signaling message of the access network through the reverse process.

In summary, in the system and method of the present invention, aiming at the subject of interconnection between 3G/2G wireless communication network and OAN (such as a network accessed by PON technology), it is proposed that the wireless network move the wireless interface protocol stack down to the base station, and then integrate with the The OAM network tightly coupled or loosely coupled solution, as a wireless extension of OAM wired access, is suitable for fixed wireless, nomadic, portable and mobile access applications, and provides an evolutionary path for OAN network operators to develop wireless networks. Specifically, the system and method of the present invention move the wireless interface protocol stack down to the base station, which has the following advantages:

1. The standard Iu/Iur interface is reused to the greatest extent, and the existing UTRAN architecture can evolve smoothly;

2. The downshift of the air interface protocol stack reduces the impact of transmission delay on user QoS and provides a guarantee for the QoS of high-speed data services; the link load between the BS and the base station controller will be greatly reduced, because the wireless interface protocol Control plane RRC configures the radio interface protocol The message of the user plane protocol will be executed inside the BS, and this link will not be used for RLC retransmission, the transmission mechanism between the BS and the base station controller will be greatly simplified, and the data transmission will be improved. Performance and efficiency of use of wireless access network resources, solving the problems of the prior art;

3. The separation of the control plane and the user plane can simplify the design of each entity, optimize the functions of RNC and base station, SGSN and GGSN, and make it more suitable for the access network structure with distributed network structure, and ensure that the network and UE There is a quick response mechanism between them, and it has stronger flexibility and scalability, which brings convenience to networking and thus better adapts to future business development;

4. Adopting many-to-many network architecture, effectively avoiding single point of failure;

5. It is especially suitable for fixed, nomadic, portable and low-speed mobile wireless access applications, and is easy to integrate with wired networks.

The tight coupling method proposed by the present invention is based on Wireless/Mobile over Fiber (wireless/mobile network carried by fiber optics), and complements the characteristics of wireless/mobile access technology and OAN access technology to expand the coverage of the network. Wireless/Mobile over Fiber mainly uses wireless coverage to supplement the coverage of OAN, which can make the construction of 3G/2G access network use the line resources already deployed in the original OAN network as much as possible, thereby reducing the construction cost of 3G/2G access network.

The loose coupling method proposed by the present invention shares the core network resources of the two networks as much as possible for the wireless network and the OAN, and performs unified authentication, billing and customer care (Customer Care).

It should be understood that the above descriptions for specific embodiments are relatively detailed, but should not be construed as limiting the scope of the patent protection of the present invention, and the scope of protection of the patent protection of the present invention should be determined by the appended claims.

Claims (39)

1, a kind of wireless network layer moves down the system that realizes network interconnection, and it comprises Radio Access Network and corresponding core network, and described Radio Access Network comprises the base station network element; It is characterized in that described system is set to control and separates with bearing function, and comprises wireless interface network servo and wireless adapter, is used for original Radio interface protocols is moved down into the wireless adapter of base station;

Described wireless adapter is used to provide medium access control, Radio Link control, PDCP, cell-specific RRM and switching control function;

Described wireless interface network servo is used to provide the base station to add the function of migration between the wireless adapter and system information broadcast.

2, system according to claim 1 is characterized in that, described base station and wireless adapter network element become one and become the base station and add the wireless adapter network element.

3, according to claim 1 or 2 any described systems, it is characterized in that, also further comprise: the packet-switched domain of core network is done control decompose with the carrying separation function, the defined function unit comprises:

Serving GPRS Support Node server, Serving GPRS Support Node gateway, Gateway GPRS Support Node server and Gateway GPRS Support Node gateway;

Described Serving GPRS Support Node server comprises the chain of command function of SGSN, is used to realize mobile management, the chain of command function of connection management and session management;

Described Serving GPRS Support Node gateway comprises the user plane functions of SGSN;

Described Gateway GPRS Support Node server comprises the chain of command function of GGSN;

Described Gateway GPRS Support Node gateway comprises the user plane functions of GGSN.

4, system according to claim 3 is characterized in that, in described core network, described Serving GPRS Support Node gateway and base station add the user's face of the interface employing interface Iu between wireless adapter; Interface between described Serving GPRS Support Node server and wireless interface network servo adopts the chain of command of interface Iu.

5, system according to claim 4 is characterized in that, the interface between described Serving GPRS Support Node gateway and Gateway GPRS Support Node gateway adopts user's face of interface Gn; Interface between described Serving GPRS Support Node server and described Gateway GPRS Support Node server adopts the chain of command of interface Gn.

6, system according to claim 4, it is characterized in that, the Megaco of interface employing IETF between described Serving GPRS Support Node server and Serving GPRS Support Node gateway or ITU-T are H.248, or adopting brand-new protocol stack, described Serving GPRS Support Node server manages the Serving GPRS Support Node gateway by Megaco/H.248.

7, system according to claim 4, it is characterized in that, the Megaco of interface employing IETF between described Gateway GPRS Support Node server and described Gateway GPRS Support Node gateway or ITU-T are H.248, or adopting brand-new protocol stack, described Gateway GPRS Support Node server manages the Gateway GPRS Support Node gateway by Megaco/H.248.

8, according to claim 1 or 2 any described systems, it is characterized in that, also further comprise: control is done in the PS territory of core network decomposed with the carrying separation function, the defined function unit comprises:

Comprehensive GPRS Support Node server and comprehensive GPRS Support Node gateway;

Described comprehensive GPRS Support Node server comprises the chain of command function of former SGSN and GGSN, and described comprehensive GPRS Support Node gateway comprises the user plane functions of former SGSN and GGSN.

9, system according to claim 8 is characterized in that, in described core net, described comprehensive GPRS Support Node gateway and base station add the user's face of the interface employing interface Iu between wireless adapter;

Interface between described comprehensive GPRS Support Node server and wireless interface network servo adopts the chain of command of interface Iu.

10, system according to claim 8 is characterized in that, H.248 interface between described Gateway GPRS Support Node server and Gateway GPRS Support Node gateway adopts the Megaco of IETF or ITU-T, or adopts brand-new protocol stack; Described Gateway GPRS Support Node server manages the Gateway GPRS Support Node gateway by Megaco/H.248.

11, a kind of wireless network layer moves down the method that realizes network interconnection, comprise: the reference point a interconnection in Optical Access Network by adaption function body and Optical Access Network wireless communications network base station and wireless adapter, the reference point v interconnection in optical access network of the wireless interface network servo of cordless communication network and core net and light path destination node is to realize the interconnection of optical-fiber network and cordless communication network.

12, method according to claim 11 is characterized in that, described base station adds the integrated network element of wireless adapter with integrated, the described base station of wireless adapter network element and separates with adaption function body network element, interconnects with reference point T;

Perhaps, base station and wireless adapter network element and adaption function body network element become one, with the reference point a interconnection of network unit/optical network terminal in Optical Access Network.

13, method according to claim 12 is characterized in that, wireless interface network servo can become one with light path destination node network element.

14, method according to claim 13 is characterized in that, also comprises enabling the compression/de-compression function, and the transmission course of the user face data of this moment comprises:

Up:

The application layer data of A1, subscriber equipment is packaged into the PDCP agreement of issuing wireless network layer behind IP bag or the PPP bag, and the PDCP agreement is compressed the data packet head, and the data after will compressing are passed to the RLC/MAC of wireless network layer;

B1, RLC/MAC agreement receive processing data packets intact after, issue the WCDMA physical layer after increasing the RLC/MAC header, described physical layer is carried out the coded modulation operation to the packet that receives and is sent to UTRAN by the Uu interface;

Among C1, the described UTRAN, the WCDMA physical layer that the base station adds wireless adapter is received the medium access control/radio link control that sends to wireless network layer after the data;

D1, described MAC/RLC agreement are removed protocol header successively, merge through reorganization, and data are issued the PDCP of wireless network layer, and compressed packet header is decompressed;

E1, described base station add the data that wireless adapter will separate out by the GPRS Tunnel Protocol tunnel and are forwarded to core network through corresponding interface.

15, method according to claim 14 is characterized in that, corresponding interface GPRS Tunnel Protocol, UDP and IP between described wireless adapter and core network can directly be carried on the Optical Access Network.

16, method according to claim 15 is characterized in that, described step e 1 also comprises:

E11, described base station add wireless adapter GPRS Tunnel Protocol/UDP/IP bag are divided into data link frame, and are carried on that physical layer is sent to the adaption function body between Node B and adaption function body;

E12, described adaption function body are converted to the optical network unit data link frame with data link frame, and are carried on that physical layer is sent to network unit/optical network terminal between network unit/optical network terminal and adaption function body;

E13, described network unit/optical network terminal are converted to the optical distribution network data link frame that is fit to optical transmission with the network unit/optical network terminal data link frame, and carry out the electric light conversion and be carried on the optical distribution network physical layer, are sent to the light path destination node through optical fiber;

E14, described light path destination node physical layer are carried out opto-electronic conversion and are obtained the optical distribution network data link frame, the optical distribution network data link frame are converted to data link frame again and are sent to core network and do further processing.

17, method according to claim 16 is characterized in that, described step e 1 also is included in the step of core network:

F1, described SGSN/ Serving GPRS Support Node gateway do the transport network layer of corresponding interface and wireless network layer is handled, and receives data from the GPRS Tunnel Protocol tunnel of this interface and passes through the Gn/Gn-D interface with the GPRS Tunnel Protocol tunnel again and send to GGSN/ Gateway GPRS Support Node gateway;

G1, GGSN/ Gateway GPRS Support Node gateway are issued external network with the form of IP bag or ppp protocol bag by corresponding interface.

18, method according to claim 16 is characterized in that, described step e 1 also is included in the step of core network:

The comprehensive GPRS Support Node gateway of F2, IGSN/ does the transport network layer of corresponding interface and wireless network layer is handled, and the data that receive from the GPRS Tunnel Protocol tunnel of this interface are exactly IP bag or the PPP bag of UE;

The comprehensive GPRS Support Node gateway of G2, described IGSN/ is issued external network with the form of IP bag or ppp protocol bag.

19, method according to claim 13 is characterized in that, the transmission course of described chain of command signaling comprises:

Up:

The Radio Resource control of A2, subscriber equipment is packaged into the RLC/MAC that packet is passed to wireless network layer with the signaling message of short message or this layer;

B2, described RLC/MAC agreement receive processing data packets intact after, issue the WCDMA physical layer after increasing the RLC/MAC header, physical layer is carried out operation such as coded modulation and is sent to UTRAN by the Uu interface to the packet that receives;

The WCDMA physical layer that the base station adds wireless adapter among C2, the UTRAN is received the MAC/RLC agreement that sends to wireless network layer after the data;

D2, described MAC/RLC agreement are removed protocol header successively, merge through reorganization, and data are issued the radio resource control of wireless network layer, and this radio resource control is direct parsing signaling message usually, carries out respective handling.

20, method according to claim 19, it is characterized in that, add between the wireless adapter for the base station and to move, many cell radio resource management, system information broadcast, paging control, and the forwarding capability of Radio Access Network Application Part/Radio Network Subsystem Application Part message, the Radio Resource control that described base station adds wireless adapter is directly notified the radio resource control layer of wireless interface network servo corresponding signaling message by its corresponding interface wireless network layer and transport network layer carrying with result, delivers core network by wireless interface network servo through the wireless network layer of corresponding interface and transport network layer again and handles.

21, method according to claim 20 is characterized in that, Radio Resource control, wireless network layer and the transport network layer of the interface between described wireless adapter and wireless interface network servo directly are carried on the Optical Access Network.

22, method according to claim 21 is characterized in that, described method also comprises:

E21, described base station add wireless adapter FP/IP or NBAP/SCTP/IP bag are divided into data link frame, and are carried on that physical layer is sent to the adaption function body between Node B and adaption function body;

E22, described adaption function body are converted to the optical network unit data link frame with data link frame, and are carried on that physical layer is sent to network unit/optical network terminal between network unit/optical network terminal and adaption function body;

E23, described network unit/optical network terminal are converted to the optical distribution network data link frame that is fit to optical transmission with the network unit/optical network terminal data link frame, and carry out the electric light conversion and be carried on the optical distribution network physical layer, are sent to the light path destination node through optical fiber;

E24, described light path destination node physical layer are carried out opto-electronic conversion and are obtained the optical distribution network data link frame, the optical distribution network data link frame are converted to data link frame again and are sent to core network and do further processing.

23, method according to claim 22, it is characterized in that, in the described core network, IGSN/SGSN/IGSN-Server/SGSN-Server does Iu-C interface transport network layer and wireless network layer is handled, and obtains short message from Radio Access Network Application Part.

According to claim 14 or 19 described methods, it is characterized in that 24, Optical Access Network adopts two layers of bridging technology between described wireless adapter and core network, promptly adaption function body, network unit/optical network terminal and light path destination node are all two layers of network element.

According to claim 14 or 19 described methods, it is characterized in that 25, adopt three layers of route technology between described wireless adapter and core network, promptly adaption function body, network unit/optical network terminal and light path destination node are all three-layer network unit.

26, a kind of wireless network layer moves down the method that realizes network interconnection, comprise: wireless communication network base station and wireless adapter are interconnected at the optical distribution network place by optical network unit or Optical Network Terminal and optical access network broadband networks, the reference point v interconnection in optical access network of the wireless interface network servo of cordless communication network and core net and light path destination node is to realize the interconnection of optical-fiber network and cordless communication network.

27, method according to claim 26 is characterized in that, described base station adds the integrated network element of wireless adapter with integrated, the described base station of wireless adapter network element and separates with optical network unit or Optical Network Terminal network element, with reference point a interconnection,

Perhaps, base station and wireless adapter network element and optical network unit or Optical Network Terminal network element become one, and interconnect at the Optical Distribution Network place with optical access network.

28, method according to claim 27 is characterized in that, wireless interface network servo can become one with light path destination node network element.

29, method according to claim 28 is characterized in that, also comprise enable the compression/de-compression function after, the transmission course of user face data comprises:

Up:

The application layer data of A3, subscriber equipment is packaged into the PDCP agreement of issuing wireless network layer behind IP bag or the PPP bag, and the PDCP agreement is compressed the data packet head, and the data after will compressing are passed to the RLC/MAC of wireless network layer;

B3, described RLC/MAC agreement receive processing data packets intact after, issue the WCDMA physical layer after increasing the RLC/MAC header, physical layer is carried out operation such as coded modulation and is sent to UTRAN by the Uu interface to the packet that receives;

The WCDMA physical layer is received the MAC/RLC agreement that sends to wireless network layer after the data among C3, the described UTRAN, and the MAC/RLC agreement is removed protocol header successively, merges through reorganization, data is issued the PDCP agreement of wireless network layer;

D3, described PDCP agreement decompress compressed packet header, and the data that will separate out by the GPRS Tunnel Protocol tunnel are forwarded to core network through corresponding interface.

30, method according to claim 29 is characterized in that, interface GPRS Tunnel Protocol, UDP and IP between described wireless adapter and core network directly are carried on the Optical Access Network.

31, method according to claim 30, it is characterized in that, described base station adds wireless adapter GPRS Tunnel Protocol/UDP/IP bag is divided into the optical distribution network data link frame that is fit to optical transmission, and carries out the electric light conversion and be carried on the optical distribution network physical layer, is sent to the light path destination node through optical fiber; Described light path destination node physical layer is carried out opto-electronic conversion and is obtained the optical distribution network data link frame, the optical distribution network data link frame is converted to data link frame again and is sent to core network and does further processing.

32, method according to claim 31, it is characterized in that, in described core network, SGSN/SGSN-GW does the transport network layer and the wireless network layer of corresponding interface and handles, and receives data from the GPRS Tunnel Protocol tunnel and sends to GGGSN/GGSN-GW with the GPRS Tunnel Protocol tunnel through the Gn/Gn-D interface again;

GGSN/GGSN-GW issues external network with the form of IP bag or ppp protocol bag by the Gi interface again.

33, method according to claim 32 is characterized in that, IGSN/IGSN-GW does the transport network layer and the wireless network layer of Iu-D interface and handles, and receives the IP bag or the PPP bag of subscriber equipment from the GPRS Tunnel Protocol tunnel of Iu-D interface;

IGSN/IGSN-GW issues external network with the form of IP bag or ppp protocol bag again.

34, method according to claim 28 is characterized in that, the transmission course of its chain of command signaling comprises:

Up:

The Radio Resource control of A4, subscriber equipment is packaged into the RLC/MAC that packet is passed to wireless network layer with the signaling message of short message or this layer;

B4, RLC/MAC agreement receive processing data packets intact after, issue the WCDMA physical layer after increasing the RLC/MAC header, physical layer is carried out operation such as coded modulation and is sent to UTRAN by the Uu interface to the packet that receives;

The WCDMA physical layer is received the MAC/RLC agreement that sends to wireless network layer after the data among C4, the UTRAN, and the MAC/RLC agreement is removed protocol header successively, merges through reorganization, data is issued the radio resource control of wireless network layer;

D4, described radio resource control are resolved signaling message, carry out respective handling.

35, method according to claim 34 is characterized in that, its base station adds wireless adapter the FP/IP of corresponding interface or NBAP/SCTP/IP bag are divided into the optical distribution network data link frame that is fit to optical transmission; And carry out electric light conversion and be carried on the optical distribution network physical layer, be sent to the light path destination node through optical fiber; Described light path destination node physical layer is carried out opto-electronic conversion and is obtained the optical distribution network data link frame, again the optical distribution network data link frame is converted to data link frame and is sent to wireless interface network servo.

36, method according to claim 35, it is characterized in that, described wireless interface network servo is done the transport network layer and the wireless network layer of corresponding interface and is handled, obtain the RNL frame of Radio Resource control, send to the MAC/RLC agreement of RNL, the MAC/RLC agreement is removed protocol header successively, merge through reorganization, data are issued Radio Resource control, radio resource control decompresses compressed packet header, obtain packet, by the wireless network layer and the transport network layer processing of corresponding interface packet is mail to core network then.

37, method according to claim 36, it is characterized in that, in the described core network, IGSN/SGSN/IGSN-Server/SGSN-Server does the corresponding interface transport network layer and wireless network layer is handled, and obtains short message from Radio Access Network Application Part.

According to claim 29 or 34 described methods, it is characterized in that 38, the Optical Access Network between described wireless adapter and core network adopts two layers of bridging technology, promptly the light path destination node is two layers of network element.

According to claim 29 or 34 described methods, it is characterized in that 39, adopt three layers of route technology between described wireless adapter and core network, promptly described light path is a three-layer network unit.

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