CN1960302A - Wireless access communication system - Google Patents

Abstract

A wireless access system, including: NodeB+, which receives UE data, and transmits the received data to the data server UPS through a tunnel or IP transmission network after being processed by the physical layer and the MAC layer; The data is processed at the RLC layer, and then transmitted to the gateway support node through the tunnel; the gateway support node GGSN provides routing for data transmission, and further forwards the received data to the external network E-PDN; the wireless controller RCS is used for Node+, Data server UPS, gateway support node GGSN and UE control and manage. Through the new wireless access system provided by the present invention, by realizing the principle of separation of the control plane and the user plane, and rationally arranging the functional levels of the control plane and the user plane of each node, the types and quantities of network nodes can be reduced, and the The system constitutes the cost, and reduces the delay of signaling and data transmission, and improves user satisfaction.

Description

Wireless Access Communication System

technical field

The present invention relates to a new wireless access system supporting the long-term evolution (hereinafter referred to as LTE) system structure of the mobile communication system proposed by the Third Generation Partnership Project (hereinafter referred to as 3GPP).

Background technique

The structure of the existing Third Generation Partnership Project (hereinafter referred to as 3GPP) is shown in FIG. 1 . The following is a description of the structure of the GPP system in FIG. 13 .

101 User equipment (hereinafter referred to as UE) is a terminal device used by an individual to receive and send user data.

102 The base station (hereinafter referred to as NodeB) is the node in the wireless network subsystem (referred to as RNS) responsible for wirelessly receiving and sending user data; it directly communicates with the UE through air radio waves in a certain format (such as air channel, coding method, etc.) For communication, the user data from the network forwarded by the CRNC described below is sent to the UE, and the data from the UE is forwarded to the network through the CRNC. Usually, there are one or more cells (hereinafter referred to as cells) under one NodeB.

103 Controlling the radio network controller (hereinafter referred to as CRNC) is the radio network controller that directly controls the NodeB; it is responsible for the specific format used by the NodeB to communicate with the UE, and according to the control of the SRNC described below, the user transferred by the NodeB The data is forwarded to the network side through the SRNC, and the user data forwarded from the SRNC is forwarded to the UE through the NodeB. CRNC has the functions of "cell management" and "common channel processing".

104 Serving Radio Network Controller (hereinafter referred to as SRNC) is a radio network controller (hereinafter referred to as RNC) that controls bearer information; it forwards user data from CRNC to the following GGSN, and forwards user data from GGSN to CRNC . SRNC has functions such as "dedicated channel control", "control over UE", "broadcast management", "paging management" and "multi-cell radio resource management".

105 Gateway General Packet Radio Service (hereinafter referred to as GPRS) Support Node (hereinafter referred to as Gateway GPRS Support Node as GGSN) and 106 Serving GPRS Support Node (hereinafter referred to as SGSN) provide routing for data transmission. Among them, the SGSN mainly has functions such as "PMM (Datagram Mobility Management)" and "SM (Session Management)".

107E-PDN is an external public data network that provides data sources.

The above-mentioned functional modules of each network node can be divided into two categories. Among them, the "dedicated channel processing" and "common channel processing" functional modules are really directly used for the transmission of user data, so they are usually included in the user plane; while others such as "cell management", "control of UE", " Functional modules such as "broadcast management", "paging management", "multi-cell radio resource management", "PMM" and "SM" are not directly used to transmit user data, they are mainly used to communicate between the user equipment UE and the network in different The aspect (including service request, control of different transmission resources and switching, etc.) controls the wireless access bearer and connection, and also includes the transparent transmission mechanism of the non-access stratum (hereinafter referred to as NAS). Therefore it is usually included in the control plane.

In the existing system, when the UE transfers data through the CRNC and the SRNC performs data transmission and communication through the air, it must follow a certain protocol. This protocol is often referred to as the Uu interface. The air interface protocol can be developed in different layers, and each layer is responsible for different communication functions.

The air interface can be divided into three layers: a physical layer (hereinafter referred to as L1); a data link layer (hereinafter referred to as L2); and a network layer (hereinafter referred to as L3). Among them, Layer 2 of the second layer can be subdivided into two sublayers: "Media Access Control, (hereinafter referred to as MAC)" layer and "Radio Link Control, (hereinafter referred to as RLC)" layer, and two functional entities : "Packet Data Concentration Protocol, (hereinafter referred to as PDCP)" and "Broadcast/Multicast Control, (hereinafter referred to as BMC)."

As mentioned above, the L3 layer and the RLC layer are divided into two parts: the control plane (hereinafter referred to as Control plane or C-plane) and the user plane (hereinafter referred to as User plane or U-plane). The PDCP functional entity and the BMC functional entity only exist in the user plane. In the control plane, the three layers are divided into several sublayers. The lowest layer is Radio Resource Control (hereinafter referred to as RRC), and its upper layer includes "mobility management (hereinafter referred to as MM)", "call control (hereinafter referred to as CC)" and so on.

The wireless interface protocol structure is shown in Figure 2. Each module in Figure 2 represents a corresponding protocol instance. The elliptical circle of the interface between sublayers represents a service access point (hereinafter referred to as SAP) for end-to-end communication. The SAP between the MAC and the physical layer provides a transport channel. The SAP between RLC and MAC provides logical channels. The RLC layer provides three types of SAPs, corresponding to three different operation modes (UM, AM, and TM modes). PDCP and BMC entities are accessed through PDCP and BMC SAP. The service provided by the L2 layer is generally called a radio bearer (hereinafter referred to as RB). The radio bearer of the control plane provided by the RLC to the RRC is called a signaling radio bearer (hereinafter referred to as signaling radio bearer). In the control plane, the interface between "Dupplication Avoidance" and the upper sublayer (CC, MM) of L3 is defined by the general control (hereinafter referred to as GC), notification (hereinafter referred to as Nt) and dedicated control (hereinafter referred to as DC) SAP.

There is control interaction between RRC and MAC and between RRC and L1. Similarly, RRC and RLC, RRC and PDCP, and RRC and BMC all have control interfaces. These interfaces allow RRC to control the configuration of the lower layers. Therefore, separate control SAPs are defined between RRC and each lower layer (PDCP, RLC, MAC and L1). The functions of the above-mentioned control plane such as "cell management", "control over UE", "broadcast management", "paging management", and "multi-cell radio resource management" are all controlled by the RRC. The RLC sublayer provides an Automatic Repeat Request (ARQ for short) function closely combined with the wireless transmission technology. There is no difference between control plane and user plane RLC instances.

Among them, the MAC sublayer consists of several different MAC entities, including MAC-d for dedicated channels, MAC-c/sh for common channels, and MAC-hs for channels used by high-speed downlink data services. The detailed description of these entities is not directly related to the present invention, and is described in detail in existing technical specifications, so no detailed description is given here.

The existing 3GPP system structure has many shortcomings such as poor upgradeability and long call setup time. For example, when a user tries to call another user through the existing system, usually, after he presses the phone number of the other party to make a call, it takes about ten seconds to hear the ring back tone of the other party. This will bring a very bad feeling to the user and reduce user satisfaction. Therefore, the 3GPP standardization organization is carrying out the standardization work of LTE, one of the purposes of which is to reduce the delay of signaling and data transmission, and reduce the cost of system configuration.

Contents of the invention

The purpose of the present invention is to provide a new wireless access system, which can reduce the delay of signaling and data transmission by realizing reasonable separation of control plane and user plane.

In order to realize the present invention, a wireless access system includes:

NodeB+, receives UE data, and sends the received data to the data server UPS through the tunnel or IP transmission network after being processed by the physical layer and the MAC layer;

The data server UPS processes the data received from NodeB+ at the RLC layer, and then transmits the data to the gateway support node through the tunnel;

The gateway supports the node GGSN, provides routing for data transmission, and further forwards the received data to the external network E-PDN;

The radio controller RCS is used to control and manage Node+, data server UPS, gateway support node GGSN and UE.

Through the new wireless access system provided by the present invention, by realizing the principle of separation of the control plane and the user plane, and rationally arranging the functional levels of the control plane and the user plane of each node, the types and quantities of network nodes can be reduced, and the The system constitutes the cost, and reduces the delay of signaling and data transmission, and improves user satisfaction.

Description of drawings

Fig. 1 is the existing 3GPP system structure;

Figure 2 wireless interface protocol structure diagram;

Fig. 3 is a new wireless access system;

Fig. 4 is an embodiment of data transmission from UE to E-PDN to which the present invention is applied.

Detailed ways

The present invention proposes a new wireless access system, referring to Fig. 3, wherein the new data server (hereinafter referred to as UPS) concentrates the user plane functions of SRNC and SGSN in the existing system; the enhanced base station (hereinafter referred to as UPS) NodeB+) not only has all the functions of the base station of the existing system, but also concentrates the functions of the user plane and control plane of the CRNC in the existing system, and part of the user plane and control plane of the SRNC; and the new wireless controller (hereinafter RCS for short) concentrates other control plane functions of SRNC and SGSN in the existing system. In this way, by separating the control plane and the user plane in principle, the types and quantities of network nodes can be reduced, the delay of signaling and data transmission can be reduced, and the cost of system configuration can be reduced. On the other hand, in the new wireless access system proposed by the present invention, RCS has "PMM", "SM", "Control to UE", "Broadcast Management", "Paging Management", "Multi-cell Wireless Resource management” and “cell control” functions; NodeB+ has functions such as “cell management” and providing “dedicated channels” and “common channels”; in this way, by rationally arranging the functions of the control plane and user plane of each node, it can be further reduced Delays in signaling and data transmission.

On the other hand, in terms of layers, the PDCP layer and RLC layer are located in UPS; the MAC layer is located in NodeB+; in this way, by rationally arranging the layers included in each node, the delay of signaling and data transmission is further reduced.

Fig. 4 is an embodiment of data transmission from UE to E-PDN to which the present invention is applied. In order to avoid making the description of this patent too lengthy, in the following description, detailed descriptions of functions or devices that are well known to the public are omitted.

401 is UE, 402 is NodeB+, 403 is RCS, 404 is UPS, 405 is GGSN, 406 is E-PDN. In the described embodiment, there are physical direct paths between 402 and 404, between 403 and 404, between 404 and 405, and between 405 and 406; There is a physical direct path, and the communication between 403 and 402 and 405 needs to be directly forwarded through 404.

UE at 401 transmits data to NodeB+ at 402;

The NodeB+ of 402 realizes the functions of the physical layer and the MAC layer, and transmits the received user data to the UPS of 404 through the tunnel or IP transmission network after being processed by the physical layer and the MAC layer;

The UPS of 404 realizes the function of the RLC layer, and after receiving the user data from 402, it further performs RLC layer processing, and then transmits it to the GGSN of 405 through a tunnel;

The GGSN at 405 further forwards the received data to the E-PDN at 406 .

In the above process, in order to realize data transmission, the RCS of 403 can send RRC signaling to UE to establish resources on the wireless interface; it can also send signaling to UPS and NodeB+ to establish corresponding resources. The signaling sent by the RCS to the UE and the NodeB+ is actually directly forwarded by the UPS.

Claims (9)

1. A wireless access system, comprising: NodeB+, receives the data of the UE, and transmits the received data to the data server UPS through the tunnel or IP transmission network after being processed by the physical layer and the MAC layer; The data server UPS processes the data received from NodeB+ at the RLC layer, and then transmits the data to the gateway support node through the tunnel; The gateway supports the node GGSN, provides routing for data transmission, and further forwards the received data to the external network E-PDN; The radio controller RCS is used to control and manage Node+, data server UPS, gateway support node GGSN and UE. 2. The system according to claim 1, characterized in that the signaling sent by the wireless controller RCS to UE and NodeB+ is directly forwarded by the data server UPS. 3. The system according to claim 1, characterized in that there is a physical direct path between the wireless controller RCS and the data server UPS. 4. The system according to claim 1, characterized in that there is a physical direct path between the NodeB+ and the data server UPS. 5. The system according to claim 1, characterized in that there is a physical direct path between the data server UPS and the gateway support node GGSN. 6. The system according to claim 1, characterized in that the RCS implements "PMM", "SM", "control of UE", "broadcast management", "paging management", "multi-cell radio resource management", "community control". 7. The system according to claim 1, characterized in that NodeB+ implements "cell management" and provides "dedicated channels" and "common channels". 8. The system according to claim 1, characterized in that the data server UPS realizes the functions of PDCP layer and RLC layer. 9. The system according to claim 1, characterized in that NodeB+ realizes the function of MAC layer.

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