name: HFN
full_form: Hyper Frame Number
context: CFN of COUNT-C. It is independently maintained in the ME MAC-d entity and the SRNC MAC-d entity. The "long" sequence number is the 24-bit MAC-d HFN, which is incremented at each CFN cycle. - For RLC UM mode, the "short" sequence number is the 7-bit RLC sequence number (RLC SN) and this is part of the RLC UM PDU header. The "long" sequence number is the 25-bit RLC UM HFN which is incremented at each RLC SN cycle. - For RLC AM mode, the "short" sequence number is the 12-bit RLC sequence number (RLC SN) and this is part of the RLC AM PDU header. The "long" sequence number is the 20-bit RLC AM HFN which is incremented at each RLC SN cycle. The hyperframe number HFN is initialised by means of the parameter START, which is described in section 6.4.8. The ME and the RNC then initialise the 20 most significant bits of the RLC AM HFN, RLC UM HFN and MAC-d HFN to START. The remaining bits of the RLC AM HFN, RLC UM HFN and MAC-d HFN are initialised to zero. When a new radio bearer is created
description: The Hyper Frame Number (HFN) is a sequence number incremented at each frame cycle, used to identify the order of frames in a transmission within the Radio Link Control (RLC) protocol of the Universal Mobile Telecommunications System (UMTS). It is maintained independently by both the Mobile Equipment (ME) MAC-d entity and the Serving Radio Network Controller (SRNC) MAC-d entity.
explanation: The text explicitly states that HFN is a parameter used in the UMTS RLC protocol. Its function as a sequence number for frame identification further supports its classification as a parameter.
section_title: 6.6.4.1	COUNT-C
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,B-Miscellaneous,I-Miscellaneous,I-Miscellaneous,I-Miscellaneous,O,O,O,O,O,O,O,O,B-Device,I-Device,O,B-Protocol,O,O,O,O,B-Network Function,I-Network Function,I-Network Function,O,B-Protocol,O