Wireless communication Network Learning log Three (20141209)

Today, we will introduce you to the E-utran and EPC in the network element architecture:

First, take a look at one of the following topology diagrams:

It can be seen that the E-utran is the user's mobile terminal (UE) and the base station eNodeB composition, responsible for wireless signal control and data processing, Radio resource management (Radio Resource Management), the Rights Control (admission), scheduling, service quality (QoS), honeycomb information broadcast, information packet file compression, encryption and decryption, information packet management, ARQ/HARQ and other functions. In addition , eNodeB is responsible for exchanging information on the EPC core network.

Mme is mainly responsible for the core network control function (go signaling): 1. Use the s1-mme protocol to communicate with eNodeB, responsible for mobile phone registration and cancellation of the registration process;

2. Through the S6 protocol and HSS Communication, identity authentication (authentication), Authorization (authority), Billing (Accounting) and other security functions;

3. Responsible for mobile phone selection of data packet transmission of the servo gate;

4. Manage the evolution of data encapsulation system hosting, including the establishment, alteration and demolition of business carrying capacity;

5. Manage the mobile management of Fengkai mode mobile phone, including tracking phone location and call to find the location of mobile phone;

6. Responsible for the exchange and protection of the NAS communication protocol layer data with the mobile phone;

7. Responsible for the security control of the storage layer (Access stratum, as);

Another: The use of S3 protocol and 2G/3G communication system for mobile control communication;

Roaming mobile phones communicate with HSS through the S6 protocol to ensure that multimode phones can still enjoy service under different communication systems;

S-GW (serving Gate-way) Service Gateway , is the core network data transmission protagonist, through the s1u protocol and eNodeB to communicate:

1. Responsible for routing and transmitting the use of the information;

2. act as the anchor point for the user Plane and eNodeB when changing hands ;

3. As a 3GPP anchor point between LTE and other 3GPP wireless communication systems;

4. Responsible for idle mode mobile phone downlink data path termination and when its downlink data arrived at the call to find the mobile phone left idle mode for data reception;

5. Responsible for managing and storing user content;

6. Copying user information in charge of lawful interception;

7. To assist the service quality policy control and implementation, as well as the user traffic usage billing;

Another: Through the S4 protocol and the 2G/3G wireless communication system for data packet transmission and exchange;

PDN-GW Packet Network Gateway , is the LTE core network connection with the outside world, for LTE network and other non-3GPP Web data to receive and message control shutter, through the S2, S7, SGI interface and non-3GPP wireless internet channel, PCRF, IP service network communication, and S-GW communication is through the S5 interface.

1. Play the mobile Communication data packet transmission entry point and departure point, provide mobile phone and external packet data connection line;

2. Responsible for each user's strategy execution (policy enforcement) and packet filtering;

3. Support billing, legal interception and packet review;

4. Play the SAE anchor point between 3GPP Wireless communication network and non-3GPP communication network;

5. PCRF-based request management evolution of the data packet system bearer;

6. Play based on the IP mobile anchor point of the rendering point, the distribution of IP bits to the mobile phone;

OK, learn here today, and continue learning about gsm->td->lte evolution tomorrow.

Wireless communication Network Learning Log III (20141209)