name: BSS
full_form: Base Station Subsystem
context: initial attach (see Figure 8.3.5-1 below where the procedure is illustrated): 1) The BSS sends the initial attach request message to one of the SGSN serving the BSS and includes a "Redirect Attempt Flag" IE. 2) The SGSN subsequently retrieves the "UE Usage type" from the HSS/HLR and maps it to a Dedicated Core Network (addressed with "Null-NRI/SGSN Group ID") and if it cannot serve the corresponding MS it returns the initial attach message to the BSS and includes the "Redirection Indication" IE as well as the "Null-NRI/SGSN Group ID" and possibly the "Additional P-TMSI". If the SGSN determines that it can serve the device, it returns an initial attach accept message to the BSS and includes the Redirection Completed" IE with outcome value set to "MS is accepted" or "MS is already registered" 3) When the BSS receives an initial attach request message including the "Redirection Indication" IE it continues the rerouting procedure by sending the initial attach message to an SGSN identified
description: The Base Station Subsystem (BSS) is a network function responsible for managing radio resources and communicating with mobile stations in GSM/EDGE networks. It plays a crucial role in the initial attach procedure.
explanation: The BSS is classified as a Network Function because it acts as an intermediary between the mobile station and the SGSN, handling messages and procedures related to the initial attach process.
section_title: Dedicated Core Networks for GERAN
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