name: LLC
full_form: Lower layer compatibility
context: The 4 bytes long MAC is carried in the LLC message. One option for allowing SGSN to serve both legacy UEs and CIoT UEs, would be to use a spare bit in the control field portion of a LLC header to indicate if integrity protection has been applied by the sending LLC entity to the message. If the spare bit indicates integrity protection, the LLC entity would need to further process that LLC message before further processing can occur. This would allow extending the structure of LLC frame format more freely, e.g. allowing the MAC being an extension to current LLC frame (see figure 6.1.4-1), or allowing the 4 bytes long MAC being a replacement of the current 3 bytes long Frame Check Sequence Field. NOTE: This is a protocol specific problem which needs to be analysed in stage 3 work. Figure 6.1.4-1: A potential extension of LLC protocol to carry MAC
description: LLC (Lower Layer Compatibility) refers to the compatibility of lower layer protocols, specifically in the context of message authentication and integrity protection within the 3GPP network. It involves the use of a spare bit in the control field portion of an LLC header to indicate if integrity protection has been applied by the sending LLC entity to the message.
explanation: The provided text explicitly mentions 'LLC protocol' and discusses its role in message authentication and integrity protection, indicating that LLC is being referred to as a protocol. The description further elaborates on the functionality of LLC within the 3GPP network.
section_title: 6.1.7	Message Authentication Code
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