name: PSDK
full_form: Public Safety Discovery Key
context: The Public Safety Discovery Key (PSDK) is the root key that is used for the protection of the Pubic Safet Discovery messages. It is identified by an 8-bit PSDK ID and each PSDK is assocciated with one or more Relay Service Codes and/or Discovery Group IDs. This association is achieved by allocating a 24-bit Key Type ID to the Relay Service Codes (RSCs) and Discovery Group IDs during the Key Request/Key Response procedure. The Key Type ID is also included in the MIKEY message, so a delivered PSDK can be associated with the correct RSCs and/or Discovery Group IDs. NOTE: The allocation of RSC and/or Discovery Group ID to a particular Key Type ID is specific to a UE and does not need to be common across all UEs. When the PSDKs are provided to the UE, they shall be provided with an Expiry Time. The Expiry Time of the PSDK needs to be set such that the keys for later periods have a longer expiration period. Each PSDKs for each Key Type ID shall be associated with a different Expiry Time
description: The Public Safety Discovery Key (PSDK) is a critical network attribute used for protecting public safety discovery messages in the context of 3GPP TS 33.303. It serves as a root key, identified by an 8-bit PSDK ID, and is associated with Relay Service Codes and/or Discovery Group IDs through a 24-bit Key Type ID.
explanation: The provided text explicitly describes the PSDK as a 'root key' used for message protection, aligning with the definition of a Parameter in telecommunications. Its identification, association with other network elements, and role in security further solidify its classification as a Parameter.
section_title: 6.6.3.2	Key and their identities
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