name: SLPP
full_form: SideLink Positioning Protocol
context: For protecting the groupcast message, G-UE does the following steps: 1. Form SLPP message: SLPP header (incl. GKID) and SLPP payload (SLPP signaling). 2. Encrypt SLPP payload (SLPP signaling) using the group key (encryption key). 3. Calculate the MAC of SLPP message (GKID+SLPP signaling) using the group key (integrity key). 4. Form L2 message by including the protected SLPP message (SLPP message + MAC) as the L2 payload and append the L2 header (incl. Destination/Group ID). Figure 6.25.2-2: Exemplar Format of Protected SLPP Message For receiving and verifying the protected groupcast message, R-UE does the following steps: 1. Receive the groupcast message for the expected group by identifying the L2 Destination/Group ID, which is mapped from the Group ID allocated by the application layer. 2. Retrieve the groupcast keys for verification by identify the GKID in the received message. 3. Verify the message by checking the MAC of the received message using the groupcast key (integrity key).
description: The SideLink Positioning Protocol (SLPP) is a protocol used for positioning and signaling in sidelink communications. It specifically protects groupcast messages by encrypting payloads and verifying message integrity using group keys.
explanation: SLPP is classified as a Protocol because it defines the rules and standards for communication within a specific context (sidelink). Its function of protecting groupcast messages through encryption and verification mechanisms further solidifies its classification as a protocol.
section_title: 6.25.2.3	SLPP signaling protection and verification
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