name: R1
full_form: Release 1
context: Digital signatures provide authenticity and message integrity of system information, preventing an attacker from originating any MIB/SIBs or tampering with an existing MIB/SIB. However, a timestamp may not prevent a replay attack if the allowed delay window is set to a value that is long enough for a replay to succeed. Further, PCI may not always allow a UE to detect a replay if the UE is out of the range of a legitimate gNB whose system information is being replayed. This can be illustrated in Figure 6.27.2.2.4-1. NOTE 1: Figure 6.27.2.2.4-1 assumes an omnidirectional antenna. Attacking area when a gNB uses beamforming is not addressed in the present document. Assume R1 be the broadcasting area of a real base station (RBS1), and F be the broadcasting area of the false base station (FBS). If the FBS replays the system information from RBS1 and uses the same PCI as the RBS1, A UE located within the interclause of R1 and F, denoted by FR1, will be able to detect the duplicated PCI from
description: A release in the context of 3GPP refers to a specific version or iteration of the technical specifications. Releases are used to group and manage changes to the specifications over time, allowing for the introduction of new features and improvements while maintaining backward compatibility.
explanation: The provided text mentions 'R1' as 'Release 1', indicating it is referring to a specific release of the 3GPP technical specifications. This classification is based on the understanding that releases are used to manage versions of the specifications, and R1 fits within this category.
section_title: 6.27.2.2.4	Limitations
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