Scalable UMTS

Justification is that only a 5 MHz channel bandwidth is defined for UMTS FDD; this restriction may limit the deployment of UMTS in the case when the spectrum allocation is less than 5 MHz, or not a multiple of 5 MHz. An example of such a case is when frequency resources are re-farmed from legacy systems. A new 3GPP study (more ..)

LTE Power Consumption Model

Energy consumption can be significantly reduced in mobile networks by introducing discontinuous transmission (DTX) on the base station side. By introducing DTX on the downlink, or cell DTX, it is possible to achieve significant energy reductions in an LTE network. Cell DTX is most efficient when the traffic load is low in a cell but even when realistic traffic statistics (more ..)

PDP Context Reject : Cause Values and Descriptions

I was looking at some PDP context reject issue today and checked 3GPP 24.008. But it is always useful to have a small cheat sheet with all the reject cause values in one place. This provides all the PDP context, Secondary PDP Context or Modify PDP context reject cause values and their Descriptions. Also there is a small Description why (more ..)

Inter-RAT Handover from UTRAN to GSM

Handover from UTRAN to GSM can happen with or without prior measurements on target cell. The only criteria is UE should be in CELL_DCH state to do a IRAT handover from UTAN to GSM. Otherwise in other RRC states the UE does reselection to move to other radio access technology. IRAT handover from UTRAN to GSM can be possible without (more ..)

The UE shall be able to identify new intra-frequency cells and perform RSRP and RSRQ measurements of identified intra-frequency cells without an explicit intra-frequency neighbour list containing physical layer cell identities. An intra frequency cell is considered to be detectable according to RSRP, RSRP Ês/Iot, SCH_RP and SCH Ês/Iot as defined below for a corresponding Band. RSRP in dBm > (more ..)

EMM States (EPS Mobility Management)

EMM sublayer in NAS layer has the main functionality of providing mobility service to User Equipment, that means to provide a mechanism to keep track of UEs whereabouts in a network. Along with providing mobility service, EMM also provides connection management services to SM sublayer (Session Management) and SMS entity in CM (Connection Management) sublayer. EMM entity in the UE (more ..)