java.lang.NoClassDefFoundError:failed resolution of :Lorg/apache/http/ProtocolVersion Update: This is no longer a bug or a workaround, it is required if your app targets API Level 28 (Android 9.0) or above and uses the Google Maps SDK for Android 16.0.0 or below (or if your app uses the Apache HTTP Legacy library). It is now included in the official … Read more
The Network Security Configuration feature lets apps customize their network security settings in a safe, declarative configuration file without modifying app code. These settings can be configured for specific domains and for a specific app. The key capabilities of this feature are as follows: Custom trust anchors: Customize which Certificate Authorities (CA) are trusted for an … Read more
LTE (Long Term Evolution) or the E-UTRAN (Evolved Universal Terrestrial Access Network), introduced in 3GPP R8, is the access part of the Evolved Packet System (EPS). The main requirements for the new access network are high spectral efficiency, high peak data rates, short round trip time as well as flexibility in frequency and bandwidth. Figure … Read more
PSS and SSS (LTE Synchronization) After power-up, the UE tries to obtain time and frequency synchronization with the system. For this, UE needs to detect signals to find out where the frame begins and ends. LTE define two type of synchronization signals: Primary synchronization signal (PSS) Secondary synchronization signal (SSS) UE uses the Synchronization Signals to: … Read more
MASTER INFORMATION BLOCK (MIB) is the broadcast information transmitted by eNodeB at periodically. After Decoding the PSS and SSS information UE have the information of Physical cell ID and not it can descramble the further information which Master information Block, which will provide the System bandwidth, Antenna configuration , System frame number. Bits and Bytes … Read more
What is a Channel in LTE? The information flows between the different protocols layers are known as channels. These are used to segregate the different types of data and allow them to be transported across different layers. These channels provide interfaces to each layers within the LTE protocol stack and enable an orderly and defined segregation … Read more
HARQ stands for Hybrid Automatic Repeat Request. HARQ = ARQ + FEC (Forward Error Correction)/Soft Combining. ARQ refers to Automatic Repeat Request i.e. if sender doesn’t receive Acknowledgement (ACK) before timeout, the receiver discards the bad packet and sender shall re-transmits the packet. ARQ procedure is illustrated below : Soft Combining is an error correction technique in which the bad packets … Read more
What is a LTE Scheduler ? Scheduling is a process through which eNodeB decides which UEs should be given resources (RBs), how much resource (RBs) should be given to send or receive data .In LTE, scheduling is done at per subframe basis i.e. every 1 mili second. The entity which is govern this is know … Read more
LTE Bands and Available Bandwidth Band Uplink-fmin Uplink-fmax Downlink-fmin Downlink-fmax Available Bandwidth Duplex Mode Remark 1 1920 MHz 1980 MHz 2110 MHz 2170 MHz 60 MHz FDD 2 1850 MHz 1910 MHz 1910 MHz 1990 MHz 80 MHz FDD 3 1710 MHz 1785 MHz 1805 MHz 1880 MHz 75 MHz FDD 4 … Read more
Feature Group Indicators (FGI bits) Feature Group Indicator (FGI) is a special Information Element (IE) within UE Capability Information message. The parameters other than FGI in UE Capability Information message provides information about physical layer capability e.g. UE-Category, supported Bands, Carrier Aggregation band combination etc. Feature Group Indicator provides information about radio protocol aspects. FGI information is used … Read more