name: BEARER ID
full_form: Bearer Identity
context: The sender shall use its locally stored NAS COUNT as input to the ciphering algorithm.
  The receiver shall use the NAS sequence number included in the received message (or estimated from the 5 bits of the NAS sequence number received in the message) and an estimate for the NAS overflow counter as defined in clauseÂ 4.4.3.1 to form the NAS COUNT input to the deciphering algorithm.
  The input parameters to the NAS ciphering algorithm are the constant BEARER ID, DIRECTION bit, NAS COUNT, NAS encryption key and the length of the key stream to be generated by the encryption algorithm. When an initial plain NAS message for transport of user data via control plane (i.e. CONTROL PLANE SERVICE REQUEST message) is to be partially ciphered, the length of the key stream is set to the length of the part of the initial plain NAS message (i.e. the value part of the ESM message container IE or the value part of the NAS message container) that is to be ciphered.
description: The BEARER ID is a constant input parameter to the NAS ciphering algorithm, identifying a specific bearer used for transporting user data.
explanation: Categorized as an Identifier since it uniquely identifies a bearer and its associated parameters.
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