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UL and DL cell based scheduler The scheduling is performed on cell basis. The two main functions are to decide which UE(s) shall be scheduled, the number of resources and the MCS to be applied. Furthermore the scheduler needs to be QoS aware. There is priority given to random access responses, control data, HARQ retransmissions. … Read more
Scheduler types in LTE A variety of scheduling strategies is available in LTE. The scheduling strategy is based on a certain metric. – Round-Robin. No quality indication is taken into consideration. The resources are mainly shared in an equal manner. – Max C/I. The UE with the best channel conditions gets the highest priority. The … Read more
Scheduling Principle,Frequency and time domain in LTE Deployment of shared channels offers the possibility for scheduling. In this way information on varying channel conditions can be exploited to increase the overall throughput. Fast scheduling in time (1 ms) and frequency domain reduces latency and improves peak rate. Adaptive Modulation and Coding leads to higher data … Read more
Hybrid ARQ (HARQ) in LTE Hybrid ARQ (HARQ) leads to higher efficiency in transmission and error correction. There is one HARQ entity per UE with 8 stop-and-wait processes for each HARQ entity. Both incremental redundancy and chase combining are supported. The number of HARQ retransmissions targeted by the HARQ protocol depends on the network configuration. … Read more
How CQI, PMI and RI reporting by UE in LTE? The UE is requested to send either periodic or a periodic reports concerning • Rank indication (RI) Reports are applicable for closed- and open-loop spatial multiplexing. In case of open-loop TRI=1 corresponds to transmit diversity and TRI>1 to large delay CDD. • Precoding matrix indicator … Read more
Modulation and TB size LTE Modulation Techniques In Long-Term Evolution (LTE) networks, modulation is a fundamental aspect of the physical layer responsible for encoding digital information into analog signals for transmission. LTE employs various modulation schemes to adapt to different channel conditions and maximize data rates. The primary modulation schemes used in LTE include: Quadrature … Read more
Based on DCI formats Resource allocation in LTE Based on DCI formats In LTE Three types of allocation are used: type 0: DCI formats 1, 2, 2A type 1: DCI formats 1, 2, 2A type 2: DCI formats1A, 1B, 1C, 1D One bit in the header is indicating if DCI formats 1, 2, 2A are … Read more
T-Mobile USA Deal with Crown Castle about $2.4 Billion Towers T-Mobile USA has signed a US$2.4 billion deal with Crown Castle that lets the towers operator have sole rights to use and lease out 6,400 of T-Mobile’s towers for the next 28 years. The deal also includes the sale of 800 towers to Crown Castle. … Read more
Power ramping in LTE Open loop power control together with optional power ramp-up is used during the random access process at the beginning of the connection until more accurate control information is available. Power loss due to transmission distance depends on to the increase of the distance between NodeB and the UE. In such a case, feedback information … Read more