Prashant Panigrahi

Voice over LTE (VoLTE)- Signalling

Voice over LTE – VoLTE is the technology to provide voice and video services over LTE all PS network. As LTE is a complete PS network VoLTE need to use IMS in EPS core to handle voice and video related services. Apart from IMS, VoLTE enabled UE (User Equipment) use MME (Mobility Management Entity) to authenticate a UE prior to (more ..)

Volte Battery Test (LTE vs CDMA)

VoLTE was in bad limelight because of it’s battery performance issues. I wrote an article how VoLTE will consume twice battery than traditional voice calls. The study was done by Metrico Wireless using LG Connect 4G on MetroPCS network. ST Ericsson provided a new white paper which clarifies all doubts around VoLTE. Without VoLTE CDMA/LTE systems suffer a severe penalty (more ..)

LTE Carrier Aggregation

What is carrier aggregation and how this will help in improving bandwidth and throughput? ITU set specific requirements for IMT Advanced compliant technology should fulfill. Some of these requirements include at least 40 MHz bandwidth, peak spectral efficiency of 15 bit/s/Hz in downlink and 6.75 bit/s/Hz in uplink and control plane and user plane latency of less than 100 and (more ..)

LTE Logical Channels

LTE logical channels structure and mapping between logical channels and transport channels. Logical channels reside between RLC sublayer and MAC sublayer which are layer 2 protocols in LTE protocol stack. Logical channels tells what kind of information is transferred. Logical channels can be broadly divided into two types: Control Channels (for the transfer of control plane information) Traffic Channels (for (more ..)

Qualcomm Snapdragon 600 and 800 Processors Specifications

Qualcomm unveiled two new application processors to power future mobile hardware. Like their predecessors Snapdragon 600 and Snapdragon 800 come with power packed features for fast performance and better battery life. Qualcomm Snapdragon 600 Features Quad Core Krait 300 CPU running up to 1.7 GHz Adreno 320 GPU – offering over 3x the performance of A225 &, as the first (more ..)

3GPP LTE RLC UE and NodeB Stack

RLC is a layer 2 protocol in LTE UE and NodeB. RLC – Radio Link Control protocol is a data link layer protocol. RRC (Radio Resource Control) is generally controls RLC configuration via RRC-RLC SAP. A RLC entity receives/delivers RLC SDUs from/to upper layer and ends/receives RLC PDUs to/from its peer RLC entity via lower layers. If RLC entity configured (more ..)

LTE RSRP - Reference Signal Received Power

What is RSRP (Reference Signal Received Power ) in LTE? When RSRP is is applicable in LTE systems? Reference signal received power (RSRP), is defined as the linear average over the power contributions of the resource elements that carry cell-specific reference signals within the considered measurement frequency bandwidth. For RSRP determination the cell-specific reference signals R0 shall be used. If (more ..)