name: NH
full_form: Next Hop
context: The general principle of key handling at handovers is depicted in Figure 7.2.8.1-1. Figure 7.2.8.1-1 Model for the handover key chaining The following is an outline of the key handling model to clarify the intended structure of the key derivations. The detailed specification is provided in clauses 7.2.8.3 and 7.2.8.4. Whenever an initial AS security context needs to be established between UE and eNB, MME and the UE shall derive a KeNB and a Next Hop parameter (NH). The KeNB and the NH are derived from the KASME. A NH Chaining Counter (NCC) is associated with each KeNB and NH parameter. Every KeNB is associated with the NCC corresponding to the NH value from which it was derived. At initial setup, the KeNB is derived directly from KASME, and is then considered to be associated with a virtual NH parameter with NCC value equal to zero. At initial setup, the derived NH value is associated with the NCC value one. NOTE 1: At the UE, the NH derivation associated with NCC=1 could be delayed
description: The Next Hop (NH) parameter is a critical network attribute used in the key handling model for handovers in the Access Stratum. It is derived from the KASME and associated with a NH Chaining Counter (NCC). The NH value plays a crucial role in establishing an initial AS security context between UE and eNB, MME, and the UE.
explanation: The provided text explicitly states that the Next Hop parameter is a network attribute used for key handling in handovers. Its derivation from KASME and association with a NH Chaining Counter further solidify its role as a parameter within the Access Stratum.
section_title: 7.2.8.1.1	Access stratum
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