Description
The course offers a solid understanding of the physical layer (’layer 1′) functionality of the evolved radio access (E-UTRA) as defined in the 3GPP R8 Long Term Evolution work item (LTE). The course describes the definition of and usage of physical channels for data transmission and control signalling. The physical layer processing is described step by step ‘from transport block to radio wave’. The most important physical layer procedures are discussed in detail.
The course starts out with a high level description of the evolved radio access network and the underlying radio-related concepts selected for LTE. The LTE physical channels and signals, their usage and information contents, are then discussed one by one in detail. The layer 1 channel coding, modulation, antenna/layer mapping and OFDM-signal generation is then discussed in order to provide an understanding of the mapping of physical channel information bits onto complex-valued Resource Elements.
LTE physical layer procedures (such as synchronisation, resource assignment and feedback signalling) are described in a logical scenario-based sequence, providing the student with a good understanding of the downlink and uplink transmission schemes defined for LTE.
Target group
The course is targeted at those who need detailed knowledge of the LTE physical layer processing and procedures.
Prerequisites
General knowledge of the concepts of physical channels, channel coding, modulation, scheduling and ARQ/HARQ retransmission in mobile systems (e.g. WCDMA) is highly recommended. Knowledge of HSPA is useful due to the many similarities between LTE and HSPA.
Other
This course is a well-balanced mix of lectures, presentations, discussions and mind-maps.This course is avaible as scheduled training and the presentation is given in English or Swedish. This is a theoretical course. We can also give this course as on-site training. If you are interested in customized education, don´t hesitate to contact us for furher information
Agenda
Introduction
- Overview of 3GPP releases
- Current status of the LTE standardisation work
- Summary of radio-related concepts selected for LTE
The LTE radio interface protocol and channel architecture
- Overview of layer 1-3 radio interface protocols, radio bearers and channels
- LTE physical channels: usage and contents (a first introduction)
Physical layer processing
- Forward Error Correction (Turbo coding and rate matching)
- Modulation of bits to complex-valued symbols
- Antenna/layer mapping and precoding for Tx diversity/beamforming/MIMO
- OFDM-signal creation (including an overview of OFDM in general)
Resource Element mapping
- The LTE radio frame for FDD operation
- Basic definitions: RE, REG, PRB, VRB and CCE
- Physical signals for coherent demodulation and channel estimation
- Synchronisation and network access
- Primary and Secondary Synchronisation Signals
- Broadcasting of system information on PBCH and PDSCH
- The random access procedure on PRACH/PDSCH
PDSCH transmission and related control signalling
- The PCFICH: usage, contents, cell-specific RE mapping
- The PDCCH: usage, contents, CCE mapping
- Downlink transmission modes in LTE
- Common and UE specific search spaces, blind decoding of PDCCH formats
- Usage of UE identities: RA-RNTI, TC-RNTI, C-RNTI, SPS-RNTI etc
- The PDSCH: resource assignment, ACK/NACK timing
- Uplink feedback signalling related to PDSCH transmissions
PUSCH/PUCCH transmission and related control signalling
- The PUCCH: usage, contents, PRB mapping, frequency/sequence hopping
- The PUSCH: grant allocation, ACK/NACK timing
- Multiplexing of PUCCH signalling onto PUSCH
- The PHICH: usage, contents and UE-specific RE mapping
- Uplink feedback signalling related to PUSCH transmissions
- The Sounding reference signal (SRS)
- Power control for PUSCH, PUCCH and SRS
Scheduling, link adaptation and hybrid-ARQ operation
- Time and frequency selective channels
- The MAC-layer packet scheduler
- Cross-layer interaction between layer 1 and MAC
- Channel aware TB size, MCS and PRB-set selection
- Dynamic and semi-persistent scheduling (SPS)
- UE DRX and DTX operation
- HARQ operation and redundancy version selection
- Synchronous vs asynchronous HARQ
- Adaptive vs non-adaptive retransmission
- Inter-cell interference coordination (ICIC)
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