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This section describes the BSSGP layer. It is responsible for the management of the BVC which corresponds to the virtual connection in which all the signaling and the data are sent to a particular cell.
The first section explains the layers to which BSSGP provides services. The following sections detail the procedures that are used to provide services to these layers. The second section describes the procedures that are used in the interface for the transfer of uplink and downlink user data. The third section describes the procedures that are used for GMM signaling transfer. The fourth section deals with the procedure used to manage the BVC. The last section deals with PFM procedures.

BSSGP service model

Figure 6.20 describes the BSSGP service model. It presents all layers to which BSSGP provides services, along with its service access points (SAPs). Provides services to the following layers:
• LLC. BSSGP provides functions that control the transfer of LLC frames transmitted between the SGSN and the MS through the Gb interface.
• GMM. BSSGP provides functions associated with mobility management between an SGSN and a BSS.
• NM. This refers to the functions associated with managing the virtual connections between the SGSN and the BSS and the control of the BSS or SGSN nodes such as flow control.
• Relay (RL). This layer acts as a relay between the Gb interface and the radio interface. It controls the transfer of LLC frames between the RLC / MAC and BSSGP layers.
• PFM. This handles the management of the BSS packet flow contexts between the SGSN and the BSS.