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
Radio Bearer in LTE In Long-Term Evolution (LTE) wireless communication, a “Radio Bearer” serves as a crucial link between the user equipment (UE) and the evolved NodeB (eNodeB), facilitating the exchange of data. Radio Bearers are classified into two main categories: Control Radio Bearers (CRBs) and Data Radio Bearers (DRBs). CRBs are responsible for transmitting … Read more
Eps bearer LTE EPS is a connection-oriented transmission network and, as such, it requires the establishment of a “virtual” connection between two endpoints (e.g. a UE and a PDN-GW) This virtual connection is called an “EPS Bearer” It provides a “bearer service”, i.e. a transport service with specific QoS attributes. The LTE QoS parameters associated … Read more
After the power on, the UE knows: the UE category and capability. the preferred PLMN. the carriers. The UE needs to know: The frame synchronization to be able to decode the DL radio frame. The cell parameters to be able request a connection. The UE can use: The PSS: Primary Synchronization Signal. The SSS: Secondary … Read more
Synchronization & BCH for TDD Frame in LTE Synchronization: Purpose: Achieves alignment between the base station (eNodeB) and User Equipment (UE) in LTE Time-Division Duplex (TDD) frames. Methods: Time synchronization ensures proper timing, and frequency synchronization aligns the carrier frequency. Importance: Synchronization is critical for avoiding interference and optimizing signal reception. Broadcast Channel (BCH): Function: … Read more
When the UE has obtained system information, it has to request an RRCconnection. Like it has no dedicated resources, the UE requests the connection using the Random Access Procedure using common uplink resources. At the end of the procedure, the UE is RRC connected UE and eNodeB are able to exchange data using dedicated radio … Read more