lets talk about LTE Architecture- SERVICE, EPC, E-UTRAN and User Equipment. In the LTE network is divided into 2 basic networks, namely: 1. EUTRAN (Evolved Universal Terrestrial Radio Access Network) 2. EPC (Evolved Packet Core) SERVICE IP Multimedia Subsystem (IMS) is a good example of cars that can be used in the service layer connectivity Services … Read more
Currently, beam forming is only applicable for TDD version of LTE. The time synchronous version of LTE TDD on uplink and downlink also makes the implementation of beam forming more attractive than in LTE FDD. Beam forming scheme is a signal processing technology that is used to direct radio transmission in a chosen angular direction. … Read more
Cell Edge Rate in LTE is simple if it’s High then Coverage Low and if It’s Low then Coverage high similar to Frequency selection. Not clear lets understand in detail. Cell Edge Rate in LTE Similar to other wireless communications systems, such as CDMA2000 EVDO, WiMAX and HSPA, the LTE features a rate layering feature. … Read more
LTE RAN provides the physical radio link between the User Equipment (UE) and the Evolved Packet Core (EPC) network. LTE RAN comprises eNodeBs. The eNodeB contains Transmit Receive Duplex Units (TRDUs) or Remote Radio Heads (RRHs) and communicates with the UEs. The eNodeB supports Multiple Input Multiple Output (MIMO). The LTE RAN – eNodeB provides: … Read more
SU-MIMO is one of the key technologies in LTE Rel 8. There are two major operations under SU-MIMO: transmit diversity and spatial multiplexing. Transmit diversity is an efficient way to improve the reliability of a system. Accordingly, it is used in LTE Rel-8 for control channel and data channel of cell edge mobile stations (called … Read more
CSI feedback allows downlink transmission to be adaptively optimized based on the instantaneous DL channel, so that closed loop beamforming and adaptive link adaptation can be enabled to optimize the system performance. The DL reference signal used for CSI measurement is different in Rel-8 and Rel-10. In Rel-8, CSI measurement is based on CRS, which … Read more
MU-MIMO is widely considered a key technology for system capacity improvement in modern wireless networks. In contrast to SU-MIMO, where the spatial multiplexing gain is confined to a single user, MU-MIMO allows multiple users to be co-scheduled on the same time-frequency resources to exploit this gain among two or more UE units. This is particularly … Read more
Main Work of Primary Common Pilot Channel (PCPICH) in WCDMA is as below. Carrying pre-defined sequence Fixed channel code: Cch, 256, 0, Fixed rate 30Kbps Scrambled by the primary scrambling code Broadcast over the entire cell A phase reference for SCH, Primary CCPCH, AICH, PICH and downlink DPCH, Only one PCPICH per cell The Common … Read more
The overlapping zones (number of servers) criteria are used to establish the quality of the RF propagation environment from an interference point of view. The goal of the number of servers‘ criteria is to establish dominance and reduce the waste of network resources and degraded network performance that may occur when multiple servers exist in … Read more
Reference Signal Received Quality RSRQ identifies the quality of the Reference Signal. It is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), where N is the number of RB”s of the E-UTRA carrier RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks. E-UTRA Carrier Received … Read more