36.112

36.112 is a standard for 3GPP Long Term Evolution (LTE) access stratum signaling. It describes the signaling message format and protocol architecture for signaling messages between the user equipment, which is the device that interfaces with the user, and the Evolved Node B (eNB).

The 36.112 Application Field is a set of protocol tools which define the structure of the transmission protocol between User Equipment (UE) and Evolved Node B (eNB). The goal of this application field is to enable the UE to access the eNodeB and complete various tasks such as registration, location update, and the exchange of user data over the air interface.

In terms of operation, 36.112 functions as the management layer for the UE and eNB, regulating their operations and data flows, and also maintaining the communication integrity and ensuring that data packets remain correctly addressed and authenticated. 36.112 ensures that only valid requests reach the eNodeB, and that the eNodeB is able to identify the sender, their requests, and respond accurately in order to provide the requested service.

36.112 is further divided into two broad categories, Control and Management (CM) and Service Assurance (SA). CM handles operations related to the access and transfer of data from the UE to the eNodeB over the air, while SA is concerned with the performance, reliability, and consistency of the service provided by the eNodeB. Control and Management functions include initial access and registration, bearer and wireless resource requests and modifications, radio link management, and authentication.

Service Assurance is responsible for ensuring service reliability and quality as defined in terms of Service Level Agreements (SLAs). This includes monitoring of the radio resource of the cell, performing diagnostics to identify and remedy service issues, and maintaining service performance reports. It also involves monitoring of network elements performance against Quality of Service (QoS) requirements.

Apart from these two main categories, 36.112 also defines common functions to both categories, as well as security procedures for authentication and ciphering. The authentication and ciphering functions ensure the security of user data exchange between the eNodeB and UE.

In conclusion, 36.112 Application Field and its associated protocols are critical elements in enabling 3GPP LTE access for the user. Its functions and protocols enable a reliable and secure user experience, covering both the UE and eNodeB mobility. As mobile networks continue to evolve, 36.112 Application Field remains an essential component and will continue to be used to ensure successful LTE access.