In LTE (Long-Term Evolution), handover measurements are crucial for ensuring seamless mobility as User Equipment (UE) moves across different cells within the network. These measurements assist in deciding when and to which cell a handover should occur. Here’s an overview of key handover measurements in LTE: Received Signal Strength (RSS): RSS measures the power level … Read more
Reverse power control Open loop power control Closed loop power control Inner loop power control: 800 Hz Outer loop power control Forward power control Message transmission mode: threshold transmission periodic transmission Closed loop power control Reverse open loop power control means that based on the detected signals from a base station, a mobile station … Read more
The long code is a PN sequence with period of 242-1chips The functions of a long code: Scramble the forward CDMA channel Control the insertion of power control bit Spread the information on the reverse CDMA channel to identify the mobile stations In a reverse direction, different long codes are used for the information … Read more
It can be seen from the figure that the data are read row by row into an interleaver at the transmit end,read column by column out (this process is called interleaving) and propagated after other modulation process. Then, the data enter the interleaver at the receive end row by row and are read out column … Read more
The UE is RRC connected.During the HO:The radio link is released from the eNodeB 1 and re-established on the eNodeB 2The Control plane is switched to the eNodeB 2 and the MMEThe User plane is switched to the eNodeB 2 and the S-GW The Intra-e-UTRAN-Access Mobility Support for UEs in ECM-CONNECTED handles all necessary steps … Read more
SU-MIMO = Single User MIMO It is the most common form of MIMO. Each user is served by only one BS and it occupies the resource exclusively, including time, frequency. It can be applied in the uplink or downlink. But it is generally applied only in DL. The UE can easily have 2 antennas in … Read more
India’s Supreme Court has rejected petitions to review its decision to void all 122 of the controversial GSM licenses that were awarded in 2008. Seven mobile networks affected by the license cancellation including Videocon, STel, Idea Cellular, Tata Teleservices, Unitech Wireless, Sistema Shyam and Etisalat DB had filed separate petitions. The court declined the … Read more
How Downlink Control Information or DCI in LTE? DCI serves as a means of communication from the network infrastructure (eNodeB) to the user equipment (UE), providing essential instructions and information for efficient downlink data transmission. This information includes details about resource allocation, modulation schemes, transmission power control, and more, enabling UEs to accurately decode and … Read more
How Data Transmission in UL in LTE? In UL, the UE has no dedicated resources to transmit directly when new data arrived in the buffer from higher layer. It requests resources to transmit them. It receives radio resources. It transmits them. The scheduling request is sent on the Physical Uplink Control Channel (PUCCH). This … Read more
The DL scheduler is spit into 3 functional parts: 1.The Static Scheduler: Which assigns a fixed amount of Transport Blocks as well as PDCCH and PDSCH resources for the BCCH over the DL-SCH Transport Channel.Those resources are permanently allocated. 2.The Semi-static Scheduler: Which assigns Transport Blocks as well as PDCCH and PDSCH resources for PCCH … Read more