WO2006032203A1 - A radio access network and the communication method - Google Patents

Abstract

A Radio Access Network includes: a network control unit, for transferring the user data and the control signaling between the radio core network and the radio transceiver; a radio transceiver, for processing the every protocol stack of the user data and the control signaling from the user terminal and the core network when the user terminal is communicating with the core network. This invention also discloses a method of the radio access network. This invention enables the RNC to process the data or the control signaling at station instead of at every protocol stack so as to simplify and quicken the handling process of communication, and improve the rate of processing the data and the signaling.

Description

 Wireless access network and communication method thereof

 The present invention relates to the field of communication technologies, and in particular to a wireless access network and a communication method thereof. Background of the invention

 The Universal Mobile Telecommunications System (UMTS) is a third-generation mobile communication system using Wideband Code Division Multiple Access (WCDMA) technology, and UMTS is also commonly referred to as a WCDMA communication system.

 As shown in FIG. 1, the UMTS system includes a user terminal (UE), a radio access network (RAN), and a core network (Core Network, CN). Among them, a radio access network, such as a terrestrial radio access network (UTRAN), handles all wireless related functions, while the CN processes all voice calls and data connections in the UMTS system, and implements exchange and routing with external networks. Features. The CN is logically divided into a Circuit Switched Domain (CS) and a Packet Switched Domain (PS).

Referring to Figure 2, the UTRAN contains one or several Radio Network Subsystems (RNS). An RNS consists of a Radio Network Controller (RNC) 101 and one or more Base Stations (NodeBs) 102. The interface between the RNC 101 and the CN is an Iu interface, and the NodeB 102 and the RNC 101 are connected through an Iub interface. Within the UTRAN, the RNCs are interconnected by Iur, which can be a direct physical connection or a transport network connection. The NodeB is a base station of the WCDMA system, including a wireless transceiver and a baseband processing component, and mainly performs processing of a physical layer protocol of the Uu interface, including main functions of spreading, modulation, channel coding, despreading, demodulation, channel decoding, and the like. The function of mutual conversion of baseband signal and radio frequency signal. The RNC is a radio network controller that controls the radio resources of the UTRAN, mainly completing connection establishment and disconnection, handover, and Macro sub-collection, wireless resource management control and other functions.

 When the user terminal communicates over the UMTS network, the user plane and control plane protocol stack used in the UTRAN is shown in Figure 3. 3 includes two parts of FIG. 3a and FIG. 3b, FIG. 3a is a control plane protocol stack, FIG. 3b is a user plane protocol stack, and the left side of the dotted line is a corresponding relationship diagram between the UE and the NodeB RNC, and the dotted line is right. The side is a layered transfer model between UE, NodeB, and RNC. Where Uu represents the interface between the UE and the NodeB, and lub represents the interface between the NodeB and the RNC. It can be seen from FIG. 3 that the UE side processes information of the RRC layer, the PDCP layer, the RLC, the MAC layer, and the physical layer, and the NodeB on the network side processes only the information of the physical layer, and other high-level information is all controlled by the RNC, that is, The RNC processes information of the physical layer, the MAC, the RLC, the RRC layer, and the PDCP layer.

 The functions implemented by the RRC protocol include: broadcasting information provided by the non-access stratum, broadcasting information related to the access layer, establishing, maintaining, and releasing an RC connection between the UE and the UTRAN, establishing, reconfiguring, and releasing the radio bearer, Allocating, reconfiguring, and releasing radio resources for RC connections, RRC connection mobility management, routing for high-level PDUs, requesting QoS control, UE measurement reporting and reporting control, outer loop power control, encryption control, slow dynamic channel Allocation, paging, initial cell selection and reselection in idle mode, arbitration of radio resources on uplink DCH, RRC message integrity protection and CBS control.

The functions of the RLC protocol include: segmentation and reassembly, concatenation, padding, transmission of user data, error detection, high-level PDU transmission, replica detection, flow control, non-confirmation data transmission mode sequence check, protocol error detection and recovery, encryption, Suspend and resume features. The RLC protocol provides three data transmission modes: TM, UM and AM. TM is a transparent mode transmission, which uses a fixed SDU size, has a high latency requirement, is usually used to transmit voice services or signaling, and UM is a non-acknowledge mode transmission, which uses a variable SDU size for delay requirements. It is also high. It is usually used to transport services such as streaming media. AM is a response mode transmission. This mode does not require high latency, but it has high requirements on bit error rate. It is usually used to transmit data services such as WWW. The functions of the MAC protocol include: mapping between logical channels and transport channels, selecting an appropriate transport format for each transport channel, prioritizing processing between UE data streams, and prioritizing the dynamic pre-arrangement methods between UEs, Priority processing between data streams of several users on the DSCH and FACH, the identity of the UE on the common transport channel, multiplexing the higher layer PDUs into transport blocks transmitted to the physical layer through the transport channel, and coming from the physical layer through the transport channel The transport block is multiplexed into a high-level PDU, traffic detection, dynamic transport channel type switching, transparent RLC encryption, and access service level selection.

 The functions of the PDCP protocol include: performing header compression and decompression of the IP data stream in the transmitting and receiving entities respectively, and the header compression method corresponding to a specific network layer, transport layer, or upper layer protocol, transmitting user data, The PDCP-SDU sent by the non-access stratum is forwarded to the RLC layer, and multiple different RBs are multiplexed to the same RLC entity.

 Since any data transmission and signaling control in the communication system depends on the support of each layer protocol, based on the protocol stack structure shown in FIG. 3, in the data transmission process, the UE side first performs header compression on the data by PDCP. After processing, it is sent to the RLC; the RLC implements fragmentation and cascading and sends it to the MAC; the MAC selects a suitable transport format combination (TFC) according to the current data packet and the configured transport format combination set (TFCS); The TFC is coded and modulated and sent to the Node B side; the Node B side sends data to the RNC according to the determined coding mode; the RNC side is demodulated and decoded by the PHY layer, the MAC layer, the RLC layer, and the PDCP layer. After decomposing, reassembling, and decompressing, a packet sent by the UE is obtained.

Similarly, in the signaling transmission process, the UE side encapsulates, fragments, and concatenates the signaling messages by RRC, RLC, MAC, and PHY, selects an appropriate TFC, and finally modulates the selected TFC code and sends it to the Node B. The Node B side sends the signaling message to the RNC according to the determined coding mode by the physical layer; the RNC side performs demodulation decoding, decombination, recombination data and solution by the PHY layer, the MAC layer, the RLC layer and the RRC layer. After encapsulation, it is obtained by the UE. The signaling message is then processed by the RNC according to the signaling message. (The reason why there is a PHY in the RNC is that it is responsible for implementing macro-diversity, which combines multiple wireless signals that are transmitted in the air into one useful piece of information.)

 In the existing network architecture, the protocol stack associated with the radio interface is located in the RC, and there is a transport network layer interface between Layer 2 and Layer 1, or Layer 2 sublayer, and the RRC control message also needs to pass through the transport network layer. Interface transmission, the placement of this function allows the radio interface protocol stack to require the radio access network to provide special QoS guarantees to meet the transmission requirements of the radio interface protocol stack message, which is not related to the QoS of the service request. The access network must use additional mechanisms to consume resources to ensure the correct transmission of the wireless interface information in the access network, which may result in inefficiency and waste of the wireless access network. Summary of the invention

 In view of this, an object of the present invention is to provide a wireless access network, which can improve the efficiency of a wireless access network and save resources.

 Another object of the present invention is to provide a communication method for a wireless access network, which can speed up access to the network and save resources.

 A wireless access network provided by the present invention is implemented as follows:

 A wireless access network includes:

 a network control unit, configured to forward user data and control signaling between the wireless core network and the wireless transceiver;

 The wireless transceiver, when the user communicates with the core network, performs processing on each layer of the protocol stack for user data and control signaling from the user terminal and the core network.

 The network control unit includes:

RNC server, used to forward control signals between the wireless core network and the wireless transceiver Order

 The RAN gateway is used to forward user data between the wireless core network and the wireless transmitter. The wireless transceiver is configured to perform processing of PDCP, LC, and MAC protocols on user data from the user terminal and the core network, and perform RLC and MAC protocol processing on control signaling from the user terminal and the core network, and The physical layer or transport network layer forwards.

 The wireless transceiver is configured to perform processing of PDCP, RLC, and MAC protocols on user data from the user terminal and the core network, and perform RRC, RLC, and MAC protocol processing on control signaling from the user terminal and the core network, and Forward at the physical layer or transport network layer.

 The network control unit and the wireless transceiver transmit control signaling through the SCTP/IP as a transmission bearer; the network control unit and the wireless transceiver transmit user data through the UDP/IP as a transmission bearer.

 The network control unit and the wireless transceiver transmit control signaling through the COPS/SCTP/IP as a transmission bearer; the network control unit and the wireless transceiver transmit user data through the UDP/IP as a transmission bearer.

 The communication method of the wireless access network provided by the present invention is implemented as follows: When the user terminal communicates with the core network, the wireless transceiver receives the processing from the user terminal through each layer protocol stack and through the network control unit. The user data and control signaling from the core network are processed by each layer protocol stack, and then the user data packets obtained after processing through each layer of the protocol stack are sent to the core network through the network control unit or directly sent to the user terminal, or according to The parsed control signaling performs the operation.

 The wireless transceiver transmits the user data packet obtained by processing each layer of the protocol stack to the core network via the transmission network layer.

The user terminal further performs the processing of each protocol stack on the data packet to be sent. Includes:

 The data packet to be transmitted is sent to the Radio Link Control (RLC) at the Packet Data Compression Protocol (PDCP) layer, which is sequentially compressed by the PDCP under the Transmission Control Protocol/User Datagram Protocol/Internet Protocol (TCP/UDP/IP). Layer; RLC performs fragmentation and cascading on the data packet and sends it to medium access control (MAC); MAC selects the appropriate transport format combination (TFC); finally, the physical layer encodes and modulates according to the selected TFC, and then the data packet Send to the wireless transceiver.

 When the wireless transceiver receives the user data packet from the user terminal, the processing steps of each protocol stack include:

 Al. After receiving the data sent by the physical layer of the UE side, the RTS side physical layer performs demodulation and decoding;

 Bl. The physical layer sends the decoded data to the MAC layer of the RTS. After the MAC removes the corresponding MAC control header, the corresponding data packet is sent to the RLC layer of the RTS.

 Cl. The RLC layer reassembles the fragmented and concatenated data and then sends the packet to the PDCP layer of the RTS;

 Dl. The PDCP layer decompresses the compressed TCP/UDP/IP headers in turn, and obtains the original 'starting data packet originally sent by the UE, and sends the data packet to the network control unit through the transport bearer.

 The step of the user terminal performing the protocol stack processing on the control signaling to be sent includes: the radio resource control protocol (RRC) encapsulates the signaling message of the layer into a data packet and sends the data packet to the RLC layer; The chip and the cascading are sent to the MAC layer; the MAC selects when the wireless transceiver receives the control signaling from the user terminal, and the processing steps of performing each protocol stack include:

A2. After receiving the signaling message sent by the physical layer of the UE side, the RTS side physical layer performs demodulation. Decoding

 B2. The physical layer sends the decoded data to the MAC layer of the RTS, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer of the RTS;

 C2. The RLC layer reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer of the network control unit through the transport bearer;

 D2. The RRC of the network control unit parses the message and performs corresponding processing. After the processing is completed, the network control unit sends the processing result of the message to the core network through the transmission bearer.

 When the wireless transceiver receives the control signaling from the user terminal, the processing steps of performing each protocol stack include:

 A3. After receiving the signaling message sent by the physical layer of the UE side, the physical layer on the radio transceiver side performs demodulation and decoding;

 B3. The physical layer sends the decoded data to the MAC layer of the RTS, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer of the RTS;

 C3. The RLC layer reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer;

 D3. RRC parses the message and performs corresponding processing. After the processing is completed, the processing result of the message is sent to the network control unit through the transport bearer, and then sent to the core network through the transport bearer.

 When the network control unit includes an RNC server and a RAN gateway, the control signaling is forwarded between the core network and the wireless transceiver by the RNC server, and the user data is sent through the RAN gateway in the core network and the wireless transceiver. Forward between machines.

 The transport bearer in step c2 is an SCTP/IP/L2/L1 protocol stack.

 The transport bearer in step c3 is a COPS/SCTP/IP/L2/L1 protocol stack.

The transport bearer in step dl is a UDP/IP/L2/L1 protocol stack. The invention moves the processing of data or control signaling by the original RNC in each layer protocol stack to the base station, thereby simplifying and speeding up the communication processing process, and improving the processing speed of data and signaling. The access layer protocol stack structure used in the present invention retains the layered protocol of the WCDMA system and the function of each layer protocol, and only moves the processing of the original layer RNC to the base station to be processed, that is: for the user plane information The RTS is processed by the base station RTS, the MAC, the RLC, and the PDCP layer protocol. The RNC does not perform user information processing at the access layer. For the control plane information, the base station RTS implements PHY, MAC, RLC, and RRC layer protocol processing. Therefore, the method of the present invention can simplify the communication processing process, reduce the transmission delay, improve the data and signaling processing speed and the feedback speed, so that it not only supports high-speed data transmission, but also is suitable for an access network that optimizes Node B and RNC functions. Ensure that the QoS of future high-speed data services is protected from retransmission delays.

 Moreover, if the radio interface protocol stack is completely moved down to the RTS, the link load between the RTS and the RSC will be greatly reduced, because the radio interface protocol control plane RRC configuration radio interface user plane protocol message will be executed inside the RTS, and the RLC is heavy This link will not be used again. The transmission mechanism on this interface between RTS and RSC will be simplified. The resources in the wireless access network will be effectively utilized. The wireless access network will be able to serve high-speed data services. QoS provides assurance.

 The invention separates the control plane and the user plane, can simplify the design of each entity, optimize the functions of the RC and the base station, and is more suitable for the access network structure using the distributed network structure, and ensures the network and the UE. It has a fast response mechanism, and has greater flexibility and scalability, which facilitates networking and is more adaptable to future business development. BRIEF DESCRIPTION OF THE DRAWINGS

 1 is a schematic structural diagram of a prior art UMTS system;

2 is a schematic structural diagram of a prior art UTRAN network; Figure 3 includes two parts of Figure 3a and Figure 3b, wherein Figure 3a is a control plane diagram of the UTRAN network shown in Figure 2, Figure 3b is a user plane protocol stack of the UTRAN network shown in Figure 2; Figure 4 is a specific embodiment of the present invention A schematic diagram of an access network structure of Embodiment 1;

 FIG. 5 includes three parts of FIG. 5a, FIG. 5b, and FIG. 5c, wherein FIG. 5a is a schematic diagram of the Tt interface protocol stack shown in FIG. 4, FIG. 5b is a schematic diagram of the Tr interface protocol stack shown in FIG. 4, and FIG. 5c is a schematic diagram of FIG. Schematic diagram of the illustrated Tc interface protocol stack;

 6A and FIG. 6b, wherein FIG. 6a is a schematic diagram of a protocol stack of a user plane in the access network shown in FIG. 4, and FIG. 6b is a schematic diagram of a protocol stack of a control plane in the access network shown in FIG.

 7 is a schematic structural diagram of an access network according to Embodiment 2 of the present invention;

 Figure 8 includes the four parts of Figure 8a, Figure 8b, Figure 8c and Figure 8d, wherein Figure 8a is a schematic diagram of the Tt interface protocol stack shown in Figure 7, Figure 8b is a schematic diagram of the Tr interface protocol stack shown in Figure 7, Figure 8c is FIG. 7 is a schematic diagram of a Tc interface 'protocol stack, and 8d is a schematic diagram of an interface protocol stack of Ti;

 Figure 9 includes Figure 9a and Figure %, wherein Figure 9a is a schematic diagram of a protocol stack of a user plane in the access network shown in Figure 7, and Figure 9b is a schematic diagram of a protocol stack of a control plane in the access network shown in Figure 7;

 10 is a schematic structural diagram of an access network according to Embodiment 3 of the present invention;

 Figure 11 includes the three parts of Figure la, Figure lib and Figure 11c, wherein Figure 11a is a schematic diagram of the Tt interface protocol stack shown in Figure 10, Figure l ib is a schematic diagram of the Ti' interface protocol stack shown in Figure 10, Figure 11c is Schematic diagram of the Tc interface protocol stack shown in FIG. 10;

 FIG. 12 includes FIG. 12a and FIG. 12b, wherein FIG. 12a is a schematic diagram of a protocol stack of a user plane in the access network shown in FIG. 10, and FIG. 12b is a schematic diagram of a protocol stack of a control plane in the access network shown in FIG.

FIG. 13 is a schematic structural diagram of an access network according to Embodiment 4 of the present invention; FIG. 14 includes four parts of FIG. 14a, FIG. 14b, FIG. 14c and FIG. 14d, wherein FIG. 14a is a schematic diagram of the Tt interface protocol stack shown in FIG. 13, FIG. 14b is a schematic diagram of the Tr interface protocol stack shown in FIG. 13, and FIG. 14c is a schematic diagram of FIG. FIG. 13 is a schematic diagram of a Tc interface protocol stack, and 14d is a schematic diagram of an interface protocol stack of Ti;

 FIG. 15 includes FIG. 15a and FIG. 15b, wherein FIG. 15a is a schematic diagram of a protocol stack of a user plane in the access network shown in FIG. 13, and FIG. 15b is a schematic diagram of a protocol stack of a control plane in the access network shown in FIG. Mode for carrying out the invention

 In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

 The core idea of the present invention is: to move the radio interface layer stack of the radio interface layer 2, that is, the radio interface protocol stack such as PDCP/BMC/RLC/MAC, to the NodeB, and the NodeB performs user data and control signaling from the UE and the core network. The processing of the protocol stack. In order to distinguish from the prior art, a NodeB that adds a wireless interface protocol stack processing function is called a wireless transceiver (RTS), and an RNC that no longer implements the function of the dropped wireless interface protocol stack is called a wireless base station control. (RSC).

 The down-shifted radio interface protocol stack can include two cases: one is to move down only the PDCP/BMC/RLC/MAC protocol stack, and the other is to move all the PDCP/BMC/RLC/MAC protocol stack and the R C protocol down.

For the first case, when the UE sends data to the network, the UE sends the data packet processed by the PDCP/BMC, RLC, and MAC protocol stacks to the PHY on the RTS side by the PHY, and the RTS side MAC, RLC, PDCP/ After processing by the BMC protocol stack, the original data packet sent by the UE is obtained, and then the data packet is sent to the core network through the RSC. When the UE sends a signaling message to the network, the signaling message is first processed by the RRC, RLC, and MAC protocol stacks on the UE side. Then, the PHY sent by the UE side is sent to the PHY of the RTS side, and after parsing the message through the RTS side MAC and RLC protocol stack processing, the base station performs corresponding processing according to the message content, and then sends the processing result to the RSC. The RRC layer is forwarded by the RSC to the core network.

 For the second case, when the UE sends data to the network, the specific process is the same as the first case. When the UE sends a signaling message to the network, the signaling message is first processed by the RC, RLC, and MAC protocol stacks of the UE side, and then sent to the PHY of the RTS through the PHY of the UE side, and passes through the RTS side MAC and the RLC protocol stack. After processing, the processing result is sent to the RRC layer processing in the RSC. The RSC parses out the non-access stratum message and forwards it to the core network.

 Moreover, the RSC may be a physical entity to implement the functions of the user plane and the data plane, or may be implemented by two physical entities respectively. For example, the RSC includes two parts: RSC-Sei-ver and RAN-Gateway, where RSC-Server is used. In order to realize the function of the RSC control plane, the control signaling is mainly transmitted between the RTS and the CN, and the RAN-Gateway is used to implement the function of the RSC user plane, mainly to transfer user data between the RTS and the CN.

 The technical solution of the present invention will be described in detail below with reference to FIG. 4 and specific embodiment 1.

 In this embodiment, a protocol stack such as PDCP/BMC/RLC/MAC is implemented in the original NodeB. Here, the functionally augmented NodeB is called RTS, and the original RNC is partially simplified because it no longer needs to implement a protocol stack such as RLC/MAC. Here, it is called RSC. Of course, although the function of RSC is simplified, it still implements the functions of control plane and user plane, as well as functions such as RRC, RRM radio resource control management and mobility management.

 As shown in FIG. 4, the radio access network structure of this embodiment includes: an RSC 402 and an RTS 403. The RSCs are connected to each other through the Tr interface, the RSC 402 and the RTS 403 are connected through the Tt interface, and the RSC 402 is connected to the CN 401 through the Tc interface.

The protocol stack of the Tt interface is shown in Figure 5a. In the wireless network layer of the Tt interface protocol stack, the control plane uses the RTS AP, and the user plane uses the TtUP. At the transport network layer of the Tt interface, the control plane uses SCTP/IP as the transport bearer, and the user plane uses UDP/IP as the transport bearer. Among them, RTSAP implements public transport channel management, power control, measurement and other public functions and dedicated transport channel management, data transmission, wireless link monitoring and other special functions, and is also responsible for transmitting RLC/MAC/PHY in RRC and RTS in RSC. Partial configuration information between. TtUP is the user part of the Tt interface and is responsible for transferring the user's business data from the RTS to the RSC.

 The interface between different RSCs is Tr, and the protocol stack is shown in Figure 5b. In the wireless network layer of the Tr interface protocol stack, the control plane uses RNSAP and the user plane uses TrUP. At the transport network layer of the Tr interface, the control plane uses SCCP/M3UA/SCTP/IP as the transport bearer, and the user plane uses UDP/IP as the transport bearer. Of course, the transport network control plane can add mature IP-based protocol stacks as needed. Here, RNSAP implements traffic management of public/dedicated channels, as well as traffic management of the transport network, and is also responsible for reporting measurement information of public/private entities. TrUP is the user part of the Tr interface and is responsible for transferring user data between RSCs.

 Figure 6a is a schematic diagram of the radio access network user plane protocol stack shown in Figure 4.

 The part on the left side of the dotted line in Fig. 6a represents the hierarchical relationship between the UE and the RTS, and the part on the right side of the dotted line is the hierarchical transfer model between the UE, the RTS and the RSC, where Uu represents the relationship between the UE and the RTS. Interface, Tt represents the interface between RTS and RSC. It can be seen that, for the user plane data information, the RTS can implement the processing of the PHY layer, the MAC layer, the RLC layer, and the PDCP layer protocol, which is more advantageous for the implementation of the functions in the RTS and the improvement of the efficiency. For example: The feedback retransmission mechanism of the RLC layer is implemented in RTS.

 Referring to Figures 4 and 6a, when the UE sends a data packet to the network side, the specific process is as follows:

1) On the UE side, since the structure of the protocol stack does not change, the process of data transmission on the UE side is consistent with the original WCDMA process, that is, the data packet is sent to the PDCP, and the transmission control protocol/user datagram protocol is sequentially performed by the PDCP. The Internet Protocol (TCP/UDP/IP) header is sent to the RLC after compression; the RLC performs fragmentation and concatenation of the data packet and sends it to the MAC; the MAC selects the appropriate transmission according to the current data packet and the configured transport format combination set (TFCS). Format combination (TFC); Finally, the physical layer performs code modulation according to the selected TFC, and then sends the processed data packet to the RTS through the Uu interface.

 2) On the RTS side, since the structure of the protocol stack is completely different, the RTS side processes the data processing differently, which is equivalent to moving all the processing on the original RNC side to the RTS side, which specifically includes the following steps:

 2a. After receiving the data sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding. After the corresponding MAC control header is removed, the corresponding data packet is sent to the RLC layer of the RTS.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the PDCP layer of the RTS.

 2d. RTS side The PDCP layer decompresses the compressed TCP/UDP/IP headers in turn, and obtains the original data packets originally sent by the UE to the PDCP.

 2e. RTS uses UDP/IP as the transport bearer to send this data packet to the RSC through the Tt interface, which is routed to the core network through the Tc interface for further processing.

 Similarly, the UE receives the data packet sent by the core network to the UE through the reverse process.

 6b is a control plane access layer protocol stack model suitable for the access network structure shown in FIG. 4. The left side of the dotted line in FIG. 6b represents a hierarchical relationship between the UE and the RTS, and the right side of the dotted line is A hierarchical transmission model between UE, RTS, and RSC, where Uu represents an interface between the UE and the RTS. It can be seen that for the control plane information, the RTS can implement the processing of the PHY layer, the MAC layer, and the RLC layer, and the RSC only implements the processing of the RRC layer protocol.

 As shown in FIG. 6b, when the UE sends a high-level signaling message to the network, the specific implementation process is as follows:

1) On the 13⁄4 side, since the structure of the protocol stack does not change, the UE side signaling message is sent. The sending process is consistent with the original WCDMA process, that is, the RC encapsulates the shy signaling message into a data packet and sends it to the RLC layer; the RLC performs fragmentation and cascading on the data packet and sends it to the MAC layer; the MAC is based on the current data. The packet and the configured TFCS select the appropriate TFC; finally, the physical layer performs code modulation according to the selected TFC and then sends it to the RTS through the Uu interface.

 2) On the RTS side, because the structure of the protocol stack is completely different, the RTS side processes the signaling message differently, which is equivalent to moving all the processing on the original RNC side to the RTS side, including the following steps:

 2a. After receiving the signaling message sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer of the RSC through the Tt interface.

 2d. The RRC of the RSC directly parses the message, and then performs corresponding processing according to the parsed message, such as connection establishment, measurement report, etc. After a process is completed, the RSC directly reports the processing result to the core network by using the transport bearer through the Tc interface. Processing, where the RSC can use SCTP/IP as a transport bearer.

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

 The technical solution of the present invention will be described below with reference to the accompanying drawings and specific embodiments.

The difference from the first embodiment is that the second embodiment divides the RSC into two nodes, an RSC-Server and a RAN-Gateway, according to the principle of separating the user plane and the control plane. Among them, RSC-Server implements RSC control plane functions, including protocol conversion, radio resource control and radio resource management. RAN-Gateway implements RSC user plane function, mainly transferring user data between RTS and CN. RTS is a wireless transceiver, including wireless baseband Data processing, control plane protocol conversion, and processing of radio interface protocol stacks such as PDCP/BMC/RLC/MAC'.

 Referring to FIG. 7, the radio access network network architecture of this embodiment includes an RSC Server 702, a RAN-Gateway 701, and an RTS 703. The RSC Server 702 and the RAN Gateway 701 are connected through a Ti interface, the RTS 703 is connected to the RSC Server 702 through a Tt-c interface, the CN 704 is connected to the RSC Server 702 through a Tc-c interface, and the CN 704 is connected to the RAN Gateway through a Tc-u interface. Connected to 701, the RAN Gateway 701 is connected to the RTS 703 via a Tt-u interface.

 The protocol stack for the Tt-c and Tt-u interfaces is shown in Figure 8a. As shown in Figure 8a, the wireless network layer of the Tt-c interface protocol stack uses RTSAP, and the transport network layer uses SCTP/IP as the transport bearer. The Tt-u interface protocol stack uses TtUP in the wireless network layer, and the transport network layer uses UDP/IP as the transport bearer. Here, RTSAP implements common functions such as common transport channel management, power control, measurement, and dedicated transport channel management, data transmission, and wireless link monitoring. It is also responsible for transmitting RRC configuration RLC/MAC/PHY information. TtUP is primarily responsible for transferring user data between RTS and RAN-Gateway.

 The protocol stack for the Tc-c and Tc-u interfaces is shown in Figure 8b. As shown in Figure 8b, the radio network layer of the Tc-c interface protocol stack uses RSCAP, and the transport network layer uses SCCP/M3UA/SCTP/IP as the transport bearer. The Tc-u interface protocol stack uses TcUP in the wireless network layer, and the transport network layer uses GTP-U UDP/IP as the transport bearer. RSCAP mainly implements mobility management, RAB management, and functions such as broadcasting and paging. TcUP is responsible for transmitting user data between RAN-Gateway and CN.

The protocol stack for the Tr-c and Tr-u interfaces is shown in Figure 8c. Referring to FIG. 8c, the radio network layer of the Tr-c interface protocol stack uses R SAP, and the transport network layer uses SCCP/M3UA/SCTP/IP as the transport bearer. The Tr-u interface protocol stack uses TrUP in the wireless network layer, and the transport network layer uses UDP/IP as the transport bearer. RNSAP achieves public Traffic management for common/dedicated channels, and traffic management for transport networks. It is also responsible for reporting measurement information for public/private entities. TrUP is the user part of the Tr-u interface, which is responsible for transmitting the user's business data between RAN-Gateway.

 Ti is a new interface that is very flexible and can be used with a new protocol stack or with the ITU-T H.248 protocol stack or the IETF MEGACO protocol stack.

Ti's interface protocol stack is shown in Figure 8d. The RSC-Server manages the RAN-Gateway through the Ti interface.

 Figure 9a is a schematic diagram of the user plane protocol stack of the radio access network shown in Figure 7. The part on the left side of the dotted line represents the hierarchical relationship between the UE and the RTS, and the part on the right side of the dotted line is the layered transfer model between the UE, the RTS and the RAN-Gateway, where Uu represents the relationship between the UE and the RTS. The interface, Tt-u, represents the interface between the RTS and the RAN-Gateway. It can be seen that for the user plane data information, the RTS can implement the processing of the PHY layer, the MAC layer, the RLC layer, and the PDCP layer protocol, which is more advantageous for the implementation of the functions in the RTS, and the efficiency is improved. For example: The feedback retransmission mechanism suitable for the RLC layer is implemented in the RTS.

 Referring to Figures 9a and 7, when the UE sends a data packet to the network side, the specific process is as follows:

 1) On the 13⁄4 side, since the structure of the protocol stack does not change, the process of data transmission on the UE side is consistent with the original WCDMA process, that is, the data packet is sent to the PDCP, and the transmission control protocol/user datagram protocol is performed by the PDCP in turn. The Internet Protocol (TCP/UDP/IP) header is sent to the RLC after compression; the RLC performs fragmentation and concatenation of the data packet and sends it to the MAC; the MAC selects the appropriate transmission according to the current data packet and the configured transport format combination set (TFCS). Format Combination (TFC); Finally, the physical layer encodes and modulates according to the selected TFC, and then sends the processed data packet to the RTS through the Uu interface.

2) On the RTS side, since the structure of the protocol stack is completely different, the RTS side has different processes for data processing, which is equivalent to moving all the processing on the original RC side to the RTS side. The body includes the following steps:

 2a. After receiving the data sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer of the RTS. After the MAC removes the corresponding MAC control header, the corresponding data packet is sent to the RLC layer of the RTS.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the PDCP layer of the RTS.

 2d. RTS side The PDCP layer sequentially decompresses the compressed TCP UDP/IP header to obtain the original data packet originally sent by the UE to the PDCP.

 2e. The RTS sends this data packet to the RAN-Gateway through the Tt-u interface, which routes it to the core network for further processing. Here, the RTS uses SCTP/IP as the transport bearer.

 Similarly, the UE receives the data packet sent by the core network to the UE through the reverse process.

 FIG. 9b is a control plane access layer protocol stack model suitable for the access network structure shown in FIG. 7. The left side of the dotted line in FIG. 9b represents a hierarchical relationship between the UE and the RTS and the RSC Server, and the right side of the dotted line Part of the layered transfer model between the UE, RTS and RSC Server, where Uu represents the interface between the UE and the RTS, and Tt-c represents the interface between the RTS and the RNC server. It can be seen that for the control plane information, the RTS can implement the processing of the PHY layer, the MAC layer, and the RLC layer, and the RSC Server only implements the processing of the RRC layer protocol.

 As shown in Figure 9b, when the UE sends a high-level signaling message to the network, the specific implementation process is as follows:

1) On the UE side, since the structure of the protocol stack does not change, the process of transmitting the signaling message of the UE side is consistent with the original WCDMA process, that is, the RRC encapsulates the signaling message of the layer into a data packet and sends it to the RLC layer. The RLC performs fragmentation and cascading on the data packet and sends it to the MAC layer. The MAC selects an appropriate TFC according to the current data packet and the configured TFCS. Finally, the physical layer The coded modulation is performed according to the selected TFC and then sent to the RTS.

 2) On the RTS side, since the structure of the protocol stack is completely different, the RTS side processes the signaling message differently, which is equivalent to moving all the processing on the R R side to the RTS side, including the following steps:

 2a. After receiving the signaling message sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the RSC Sever RRC layer through the Tt-c interface.

 2d. RSC Sever's RC directly parses the message, and then performs corresponding processing according to the parsing result, such as connection establishment, measurement report, etc. After a process is completed, RSC Sever uses the transport bearer to notify the core of the processing result through the Tc-c interface. Web processing.

 The first embodiment and the second embodiment adopt partial user plane function downshifting, can realize the communication processing process, reduce the transmission delay, improve the data and signaling processing speed and the feedback speed, so that it not only supports high-speed data transmission, but also applies. The access network that optimizes the Node B and RNC functions ensures that the QoS of future high-speed data services is not affected by the retransmission delay.

 Moreover, in the second embodiment, since the control plane and the user plane are separated, the design of each entity can be simplified, and the functions of the RC and the base station can be optimized, making it more suitable for the access network structure adopting the distributed network structure, and It ensures a fast response mechanism between the network and the UE, and has greater flexibility and scalability, which facilitates networking and is more suitable for future business development.

 The technical solution of the present invention will be described below with reference to FIG. 10 and the third embodiment.

In this embodiment, a protocol stack such as PDCP/BMC/RLC/MAC and RRC is implemented in the original NodeB. The NodeB function has been expanded, which is called RTS here, and the original Since the RNC no longer needs to implement a protocol stack such as RLC/MAC, the function is partially simplified, which is called RS (:.

 As shown in FIG. 10, the radio access network structure of this embodiment includes: CN 1001, RSC 1002, and RTS 1003. The RSC 1002 is connected to another RSC 1002 through the Tr interface, the RSC 1002 is connected to the RTS 1003 via the Tt interface, and the RSC 1002 is connected to the CN 1001 via the Tc interface.

 The protocol stack of the Tt interface is shown in Figure 11a. In the wireless network layer of the Tt interface protocol stack, the control plane uses RTSAP, and the user plane uses TtUP. At the transport network layer of the Tt interface, the control plane uses SCTP/IP as the transport bearer, and the user plane uses UDP/IP as the transport bearer.

RTSAP implements common functions such as common transport channel management, power control, measurement, and dedicated functions such as dedicated transport channel management, data transmission, and wireless link monitoring. TtUP is the user part of the Tt interface, which is responsible for transmitting the user's service data from the RTS to the RSC.

 The interface between different RSCs is Tr, and the protocol stack is shown in Figure l lb. As shown in Figure lib, in the wireless network layer of the Tr interface protocol stack, the control plane uses RNSAP and the user plane uses TrUP. At the transport network layer of the Tr interface, the control plane uses SCCP/M3UA/SCTP/IP as the transport bearer, and the user plane uses UDP/IP as the transport bearer. The transport network control plane can add mature IP-based protocol stacks as needed. RNSAP implements traffic management for public/dedicated channels and traffic management for transport networks. It is also responsible for reporting measurement information for public/private entities. TrUP is the user part of the Tr interface, which is responsible for transmitting the user's business data between RSCs. Figure 12a is a schematic structural diagram of an access layer user plane protocol stack in the access network shown in Figure 10.

The part on the left side of the dotted line in Fig. 12a represents the hierarchical relationship between the UE and the RTS, and the part on the right side of the dotted line is the hierarchical transfer model between the UE, the RTS and the RSC, where Uu represents the relationship between the UE and the RTS. Interface, Tt represents the interface between RTS and RSC. It can be seen that for user plane data information, RTS can implement PHY layer, MAC layer, and RLC layer. The processing with the PDCP layer and the RRC layer protocol is more conducive to the implementation of functions in the RTS, and the efficiency is improved.

 Referring to Figures 12a and 10, when the UE sends a data packet to the network side, the specific process is as follows:

 1) On the 1^ side, since the structure of the protocol stack does not change, the process of data transmission on the UE side is consistent with the original WCDMA process, that is, the data packet is sent to the PDCP, and the transmission control protocol/user datagram protocol is sequentially performed by the PDCP. /Internet Protocol (TCP/UDP/IP) header compression is sent to the RLC; the RLC performs fragmentation and cascading on the data packet and sends it to the MAC; the MAC selects the appropriate one according to the current data packet and the configured transport format combination set (TFCS). Transport format combination

( TFC ); Finally, after the physical layer encodes and modulates according to the selected TFC, the processed data packet is sent to the RTS through the Uu interface.

 2) On the RTS side, since the structure of the protocol stack is completely different, the RTS side processes the data processing differently, which is equivalent to moving all the processing on the original RNC side to the RTS side, which specifically includes the following steps:

 2a. After receiving the data sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer of the RTS. After the MAC removes the corresponding MAC control header, the corresponding data packet is sent to the RLC layer of the RTS.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the PDCP layer of the RTS.

 2d. RTS side The PDCP layer decompresses the compressed TCP/UDP/IP headers in turn, and obtains the original data packets originally sent by the UE to the PDCP.

2e. The RTS uses the transport bearer to send the data packet to the RSC through the Tt interface, and the RSC routes to the core network through the Tc interface for further processing. Here, the RTS uses UDP/IP as the transport bearer. Similarly, the UE receives the core network through the reverse process. UE's data packet.

 12b is a control plane access layer protocol stack model suitable for the access network structure shown in FIG. 10. The left side of the dotted line in FIG. 8 represents a hierarchical relationship between the UE and the RTS, and the right side of the dotted line is the UE. , a hierarchical transmission model between RTS and RSC, where Uu represents an interface between the UE and the RTS, and Tt represents an interface between the RTS and the RSC. It can be seen that for control plane information, the RTS can implement the processing of the PHY layer, the MAC layer, the RLC layer, and the R C layer protocol.

 As shown in Figure 12b, when the UE sends a high-level signaling message to the network, the specific implementation process is as follows:

 1) On the UE side, since the structure of the protocol stack does not change, the process of transmitting the signaling message of the UE side is consistent with the original WCDMA process, that is, the RRC encapsulates the signaling message of the layer into a data packet and sends it to the RLC layer. The RLC performs fragmentation and cascading on the data packet and sends it to the MAC layer; the MAC selects an appropriate TFC according to the current data packet and the configured TFCS; 'finally, the physical layer performs coding modulation on the selected TFC through the Uu interface, and then sends the packet to the MAC address. RTS„

 2) On the RTS side, because the structure of the protocol stack is completely different, the RTS side processes the signaling message differently, which is equivalent to moving all the processing on the original RNC side to the RTS side, including the following steps:

 2a. After receiving the signaling message sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer.

2c. The RTS side RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer of the RSC through the Tt interface. Here, the RTS adopts COPS/SCTP/IP as the transmission bearer, so that after the control signaling is sent to the RSC, it can be used to request policy information between the RRC and the RM in the RSC. 2d. The RSC RRC directly parses the message and performs corresponding processing according to the parsed result, such as connection establishment, measurement report, etc. After a process is completed, the RSC directly reports the processing result to the core network through the Tc interface through the transport bearer. ,

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

 The technical solution of the present invention will be specifically described below with reference to FIG. 13 and the specific embodiment 4. The difference between the fourth embodiment and the third embodiment is that the RSC is divided into two nodes, RSC-Server and AN-Gateway, according to the principle of separating the user plane and the control plane. Among them, RSC-Server implements RSC control plane functions, including protocol conversion, radio resource control and radio resource management. RAN-Gateway implements RSC user plane function, mainly transferring user data between RTS and CN. RTS is a wireless transceiver device, which includes wireless baseband data processing, control plane protocol conversion and other functions, and RLC/MAC and other wireless interface protocol stack user plane protocols are implemented in RTS.

 Referring to FIG. 13, the radio access network network architecture of this embodiment includes an RSC Server 1303, a RAN-Gateway 1302, and an RTS 1304. RSC Server 1303 and RAN-Gateway 1302 are connected through Ti interface, RTS 1304 is connected to RSC Server 1303 through Tt-c interface, RSC Server is connected to CN 1301 through Tc-c interface, and RTS 1304 is connected to RAN Gateway through Tt-u interface. The 1302 is connected, and the RAN-Gateway is connected to the CN 1301 through the Tc-u interface. .

 RSC Server implements RSC control plane functions, including protocol conversion and radio resource management. RAN-Gateway implements RSC user plane function, mainly transferring user data between RTS and CN. The RTS is a wireless transceiver that includes wireless baseband data processing, control plane protocol conversion, and other control plane protocols for the wireless interface protocol stack, such as the RC protocol, and user plane protocols such as PDCP/BMC/RLC/ in RTS. MAC, etc.

The protocol stack for the Tt-c and Tt-u interfaces is shown in Figure 14a. See Figure 14a, Tt-c connection The wireless network layer of the port protocol stack uses RTSAP, and the transport network layer uses SCTP/IP as the transport bearer. The Tt-u interface protocol stack uses TtUP in the wireless network layer, and the transport network layer uses UDP/IP as the transport bearer. RTSAP implements common functions such as common transmission channel management, power control, measurement, and special functions such as dedicated transmission channel management, data transmission, and wireless link monitoring. TtUP is primarily responsible for transferring user data between RTS and RAN-Gateway.

 The protocol stack for the Tc-c and Tc-u interfaces is shown in Figure 14b. Referring to Figure 14b, the wireless network layer of the Tc-c interface protocol stack uses RSCAP, and the transport network layer uses SCCP/M3UA/SCTP/IP as the transport bearer. The Tc-u interface protocol stack uses TcUP in the wireless network layer, and the transport network layer uses GTP-U/UDP/IP as the transport bearer. RSCAP mainly implements mobility management, RAB management, and functions such as broadcasting and paging. The function of TcUP is to transfer user data between RAN-Gateway and CN.

 The protocol stack for the Tr-c and Tr-u interfaces is shown in Figure 14c. Referring to Figure 14c, the wireless network layer of the Tr-c interface protocol stack uses RNSAP, and the transport network layer uses SCCP/M3UA/SCTP/IP as the transport bearer. The wireless network layer of the Ti'-u interface protocol stack uses TrUP, and the transport network layer uses UDP/IP as the transport bearer. RNSAP implements traffic management for public/dedicated channels and traffic management for transport networks. It is also responsible for reporting measurement information for public/private entities. TrUP is the user part of the Tr-u interface, which is responsible for transmitting user traffic data between RAN-Gateway.

 Ti is a new interface, and RSC Server can manage RAN-Gateway through Ti interface. The interface protocol stack can use a new protocol stack, which can use the ITU-T H.248/SCTP/IP protocol stack or the IETF MEGACO/SCTP/IP protocol stack. Its interface protocol stack can be seen in Figure 14d. FIG. 15a is a schematic structural diagram of an access layer user plane protocol stack in the access network shown in FIG.

The part on the left side of the dotted line in Fig. 15a represents the hierarchical relationship diagram between the UE and the RTS, and the part on the right side of the dotted line is a layered transfer model between the UE, the RTS and the RAN-Gateway, which In the Uu, the interface between the UE and the RTS is represented, and Tt-u represents the interface between the RT and the RAN-Gateway. It can be seen that for the user plane data information, the RTS can implement the PHY layer, the MAC layer, the RLC layer, and the PDCP layer processing, which is more advantageous for the implementation of the functions in the RTS, and the efficiency is improved.

 Referring to Figures 15a and 13, when the UE sends a data packet to the network side, the specific process is as follows:

 1) On the 13⁄4 side, since the structure of the protocol stack does not change, the process of data transmission on the UE side is consistent with the original WCDMA process, that is, the data packet is sent to the PDCP, and the transmission control protocol/user datagram protocol is performed by the PDCP in turn. The Internet Protocol (TCP/UDP/IP) header is sent to the RLC after compression; the RLC performs fragmentation and concatenation of the data packet and sends it to the MAC; the MAC selects the appropriate transmission according to the current data packet and the configured transport format combination set (TFCS). Format Combination (TFC); Finally, after the physical layer encodes and modulates according to the selected TFC, the processed data packet is sent to the RTS through the Uu interface.

 2) On the RTS side, since the structure of the protocol stack is completely different, the RTS side processes the data processing differently, which is equivalent to moving all the processing on the original R C side to the RTS side, which specifically includes the following steps:

 2a. After receiving the data sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer of the RTS. After the MAC removes the corresponding MAC control header, the corresponding data packet is sent to the RLC layer of the RTS.

 2c. RTS side The RLC layer performs the reassembly function, reassembles the fragmented and concatenated data, and then sends the data packet to the PDCP layer of the RTS.

 2d. RTS side The PDCP layer decompresses the compressed TCP/UDP/IP headers in turn, and obtains the original data packets originally sent by the UE to the PDCP.

2e. RTS sends this packet to the Tt-u interface using the transport bearer RAN-Gateway, routed to the core network by AN-Gateway through the Tc-u interface for further processing, where RTS uses UDP/IP as the transport bearer.

 Similarly, the UE receives the data packet sent by the core network to the UE through the reverse process.

 15b is a control plane access layer protocol stack model suitable for the access network structure shown in FIG. 13, and the left side of the dotted line in FIG. 8 represents a hierarchical relationship between the UE and the RTS, and the right side of the dotted line. A hierarchical transmission model between the UE, the RTS, and the RSC Server, where Uu represents an interface between the UE and the RTS, and Tt-c represents an interface between the RTS and the RSC Server. It can be seen that for control plane information, the RTS can implement processing of the PHY layer, the MAC layer, the RLC layer, and the RRC layer protocol.

 As shown in Figure 15b, when the UE sends a high-level signaling message to the network, the specific implementation process is as follows:

 1) On the UE side, since the structure of the protocol stack does not change, the process of transmitting the signaling message of the UE side is consistent with the original WCDMA process, that is, the RRC encapsulates the signaling message of the layer into a data packet and sends it to the RLC layer. The RLC performs fragmentation and cascading on the data packet and sends it to the MAC layer. The MAC selects an appropriate TFC according to the current data packet and the configured TFCS. Finally, the physical layer performs coding and modulation according to the selected TFC, and then sends the data to the RTS through the Uu interface. .

 2) On the RTS side, because the structure of the protocol stack is completely different, the RTS side processes the signaling message differently, which is equivalent to moving all the processing on the original RNC side to the RTS side, including the following steps:

 2a. After receiving the signaling message sent by the physical layer of the UE side through the Uu interface, the RTS side physical layer performs demodulation and decoding.

 2b. The RTS side physical layer sends the decoded data to the MAC layer, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer.

2c. The RTS side RLC layer performs the reorganization function to reassemble the fragmented and cascaded data. Then, the data packet is sent to the RRC layer of the RSC Sever through the Tt-c interface by using the transport bearer.

 2d. RSC Sever's RRC directly parses the message, and then performs corresponding processing according to the message at the resolution, such as connection establishment, measurement report, etc. After a process is completed, RSC Sever directly uses the transport bearer through the Tc-c interface. The processing result is notified to the core network. Here, RSC Sever uses SCCP/M3UA/SCTP/IP as the transport bearer.

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

 It can be seen from Embodiments 3 and 4 that the radio interface protocol stack is completely moved down to the RTS, and the link load between the RTS and the RSC is greatly reduced, because the radio interface protocol control plane RC configures the radio interface protocol user plane protocol message will be The RTS is internally implemented, and the RLC retransmission will no longer use this link. The transmission mechanism on the RTS and RSC interfaces will be simplified, and the resources in the radio access network will be effectively utilized. The radio access network will be able to QoS guarantee for high-speed data services.

 Moreover, in the fourth embodiment, due to the separation of the control plane and the user plane, the network can be developed toward the distributed architecture, and has greater flexibility and scalability, which facilitates networking and is more adaptable. Future business development. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim A wireless access network, characterized in that the network comprises:  a network control unit, configured to forward user data and control signaling between the wireless core network and the wireless transceiver;  A wireless transceiver, wherein the wireless transceiver performs protocol processing on user data and control signaling from the user terminal and the core network when communicating between the user terminal and the core network.  2. The system of claim 1 wherein the network control unit comprises:  An RNC server, configured to forward a control signal between the wireless core network and the wireless transceiver;  The RAN gateway is used to forward user data between the wireless core network and the wireless transceiver.  The system according to claim 1 or 2, wherein the wireless transceiver is configured to perform PDCP, RLC, and MAC protocol processing on user data from the user terminal and the core network, from the user terminal. And the control signaling of the core network is processed by the RLC and MAC protocols, and is forwarded at the physical layer or the transport network layer.  The system according to claim 1 or 2, wherein the wireless transceiver is configured to perform processing of PDCP, RLC, and MAC protocols on user data from the user terminal and the core network, and from the user terminal and The control signaling of the core network is processed by the RRC, RLC, and MAC protocols, and is forwarded at the associated physical layer or transport network layer. The system according to claim 1 or 2, wherein the network control unit and the wireless transceiver transmit control signaling by using SCTP/IP as a transmission bearer; the network control unit and the wireless transceiver User data is transmitted between the machines via UDP/IP as a transport bearer. The system according to claim 4, wherein the network control unit and the wireless transceiver transmit control signaling through the COPS/SCTP/IP as a transmission bearer; the network control unit and the wireless transceiver User data is transmitted between the machines via UDP/IP as a transport bearer.  7. A communication method for a wireless access system, characterized in that:  When the user terminal communicates with the core network, the wireless transceiver performs processing on each layer protocol stack on user data and control signaling from the core network processed by the user terminal through each layer protocol stack and received by the network control unit. Then, the user data packet obtained after processing through each layer of the protocol stack is sent to the core network through the network control unit or directly sent to the user terminal, or the operation is performed according to the parsed control signaling.  The method according to claim 7, wherein the wireless transceiver transmits the user data packet obtained by processing each layer of the protocol stack to the core network via the transport network layer.  The method according to claim 8, wherein the step of the user terminal performing the protocol stack processing on the data packet to be sent further includes:  The data packet to be transmitted is at the PDCP layer, and is forwarded by the PDCP to the radio link control RLC layer in sequence by the TCPAJDP/IP header. The RLC performs fragmentation and cascading on the data packet and sends it to the MAC. The MAC selects the appropriate transport format combination. TFC; Finally, the physical layer encodes and modulates according to the selected TFC, and then sends the data packet to the wireless transceiver.  The method according to claim 9, wherein when the wireless transceiver receives the user data packet from the user terminal, the processing steps of performing the protocol stacks include: a. the RTS side physical layer receives the UE side Demodulation and decoding after data sent by the physical layer; Bl. The physical layer sends the decoded data to the MAC layer of the RTS. After the MAC removes the corresponding MAC control header, the corresponding data packet is sent to the RLC layer of the RTS. Cl. The RLC layer reassembles the fragmented and concatenated data and then sends the packet to the PDCP layer of the RTS;  The PDCP layer sequentially decompresses the compressed TCP/UDP/IP header to obtain the original data packet originally sent by the UE, and sends the data packet to the network control unit through the transport bearer.  The method according to claim 8, wherein the step of the user terminal performing the protocol stack processing on the control signaling to be sent includes:  The RC encapsulates the signaling message of the layer into a data packet and sends it to the RLC layer. The RLC performs fragmentation and cascading on the data packet and sends it to the MAC layer. The MAC selects an appropriate TFC. Finally, the physical layer performs the TFC according to the selected TFC. The code is modulated and sent to the RTS.  The method according to claim 11, wherein when the wireless transceiver receives control signaling from the user terminal, the processing steps of performing each protocol stack include:  A2. After receiving the signaling message sent by the physical layer of the UE side, the RTS side physical layer performs demodulation and decoding;  B2. The physical layer sends the decoded data to the MAC layer of the RTS, and the MAC removes the corresponding MAC control header, and sends the corresponding data packet to the RLC layer of the RTS;  C2. The RLC layer reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer of the network control unit through the transport bearer;  D2. The RRC of the network control unit parses the message and performs corresponding processing. After the processing is completed, the network control unit sends the processing result of the message to the core network through the transmission bearer.  The method according to claim 11, wherein when the wireless transceiver receives control signaling from the user terminal, the processing steps of performing each protocol stack include:  A3. After receiving the signaling message sent by the physical layer of the UE side, the physical layer on the radio transceiver side performs demodulation and decoding; B3. The physical layer sends the decoded data to the MAC layer of the RTS, and the MAC removes the phase. The corresponding MAC control header sends the corresponding data packet to the RLC layer of the RTS; c3. The RLC layer reassembles the fragmented and concatenated data, and then sends the data packet to the RRC layer;  D3. The RRC parses the message and performs corresponding processing. After the processing is completed, the processing result of the message is sent to the network control unit through the transport bearer, and then sent to the core network through the transport bearer.  14. The method according to claim 7, wherein when the network control unit comprises an RNC server and a RAN gateway, the control signaling is forwarded between the core network and the wireless transceiver by the RNC server. The user data is forwarded between the core network and the wireless transceiver through the RAN gateway.  The method according to claim 12, wherein the transmission bearer in step c2 is an SCTP/IP/L2/L1 protocol stack.  The method according to claim 13, wherein the transmission bearer in step c3 is a COPS/SCTP/IP/L2/L1 protocol stack.  The method according to claim 10, wherein the transmission bearer in step dl is a UDP/IP/L2/L1 protocol stack.