Radio Protocol Architecture in LTE The EUTRAN radio protocol model specifies the protocols terminated between UE and eNB. The protocol stack follows the standard guidelines for radio protocol architectures (ITU-R M1035) and is thus quite similar to the WCDMA protocol stack of UMTS. The protocol stack defines three layers: the physical layer (layer 1), data … Read more
Physical Channel Types of LTE The physical layer uses resource blocks to transmit binary coded information in QPKS, 16QAM or 64QAM or OOK modulation form. Physical channels determine how data is processed and then mapped via dynamical scheduling onto resource blocks. Thus physical channels also in EUTRAN represent the available physical resources. Like transport channels, … Read more
LTE Layer 2 user plane protocol stack in detail LTE user Layer 2 Protocol stack-the plan is composed of three substrates, as shown in the figure. Packet layer packet data convergence Protocol (PDCP) : this layer processes messages resource control (RRC) in the control plan and packages of Internet Protocol (IP) addresses in the user’s … Read more
LTE Downlink & Uplink Physical Channel LTE Downlink Physical Channel Physical Downlink Shared Channel ( PDSCH) This channel is used for unicastand paging functions. Carries the DL-SCH and PCH. QPSK,16-QAM,and 64-QAM Modulation. Physical Downlink Control Channel (PCSCH) Informs the UE about the resource allocation of PCH and DL-SCH, and Hybrid ARQ information related to DL-SCH. Carries … Read more
How to Layer 2 Functions and Data Flow in LTE For layer 2 let us first take a look into the uplink. Data transmission is handled through the protocol stack according to the following flow: 1. Data is generated by either signaling control protocols (RRC, NAS) or by some application on the UE’s IP stack. … Read more
Here I write about each and every channel of LTE with its Functionality. How many channel and what its work. LTE Channel Functionality. List of channel with its work Physical channels PDSCH: Physical Downlink Shared Channel PBCH: Physical broadcast channel PMCH: Physical multicast channel PDCCH: Physical Downlink Control Channel PCFICH: Physical control format indicator channel … Read more
LTE Frame Structure The figure below shows the LTE frame structure under Time division mode (TDD) Type 2 and Frequency Division mode (FDD) Type 1. Differences in LTE Frame Structure Main differences in LTE Frame Structure between the two modes are Frame 0 and frame 5 (always downlink in TDD) Frame 1 and frame 6 … Read more
The state-of-the-art design of the LTE air interface is characterised by OFDMA (DL) and SC-FDMA (UL) together with MIMO. The downlink modulation is based on OFDMA (Orthogonal Frequency Division Multiple Access). OFDMA is a variant of OFDM which has the advantage that receiver complexity is at a reasonable level, it can handle scalable bandwidth requirements … Read more
The effective Eb/No and hence the spectral efficiency depend on BLER. However there are QoS requirements which also have to be considered. Taking both into account leads to a target BLER. AMC is in use in order to tune BLER so that the target value is reached. Therefore when channel conditions change modulation and/or coding … Read more
Fully packet-oriented mobile broadband network providing: – Peak data rates of 100 Mbps (DL) and 50 Mbps (UL) – Very low latency – Seamless and lossless handover – Sophisticated QoS to support important real time applications such as voice, video and interactive gaming – Support for terminal speeds of 150-500 Km/h and cell ranges of … Read more