name: RR
full_form: Radio Resource
context: This clause describes the procedures used for mobility management for non-GPRS services and for GPRS-services at the radio interface (Reference Point Um and Uu). The main function of the Mobility Management sublayer is to support the mobility of user terminals, such as informing the network of its present location and providing user identity confidentiality. A further function of the MM sublayer is to provide connection management services to the different entities of the upper Connection Management (CM) sublayer (see 3GPP TS 24.007 [20]). There are two sets of procedures defined in this chapter: - MM procedures for non-GPRS services (performed by the MM entity of the MM sublayer); and - GMM procedures for GPRS services (performed by the GMM entity of the MM sublayer), see 3GPP TS 24.007 [20]. All the MM procedures described in this clause can only be performed if a RR connection has been established between the MS and the network. Else, the MM sublayer has to initiate the establishment of a RR connection (see 3GPP TS 44.018 [84] subclause 3.3 and 3GPP TS 25.331 [23c]). In A/Gb mode, the GMM procedures described in this clause, use services provided by the RR sublayer without prior RR connection establishment. In Iu mode: all the GMM procedures described in this clause can only be performed if a PS signalling connection has been established between the MS and the network. Else, the GMM sublayer has to initiate the establishment of a PS signalling connection (see 3GPP TS 25.331 [23c]). GMM procedures are mandatory and applicable only for GPRS MSs and networks supporting those MSs. For GPRS MSs which are IMSI attached for both GPRS and non-GPRS services, some MM procedures are replaced by GMM combined procedures provided that the network operates in network operation mode I, i.e. is supporting combined GMM procedures. GMM combined procedures are not applicable for the GPRS MS operation mode C but are mandatory for the GPRS MS operation modes A and B and networks supporting network operation mode I, see 3GPP TS 23.060 [74].
description: The RR sublayer provides services to the MM and GMM entities, such as radio resource allocation and deallocation.
explanation: Categorized as a Protocol because it defines the rules for managing radio resources.
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