All posts by Azar

HOW IS LINK ADAPTATION USED IN LTE DOWNLINK ?

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For unicast traffic, link adaptation is used and is controlled by the eNodeB. A common modulation and channel code is used in the frequency domain per UE and codeword. The modulation and coding scheme (MCS) is selected based on Channel Quality Indicator (CQI) feedback and buffer content. Rapid interference variations make it difficult to predict […]

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WHAT IS LINK ADAPTION?

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Link Adaptation is about improving modulation and coding scheme (MCS) to reach users in a better way in terms of throughput and data rate, wherever they are standing within the cell coverage. Even if they are standing closer to the cell edge or farther from the cell, eNodeB scheduler will adjust its modulation scheme and/or […]

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HOW IS POWER CONTROL USED IN LTE UPLINK TRANSMISSION?

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Uplink power control is used both on the PUSCH and on the PUCCH channels. In both cases, a parameterized open loop combined with a closed loop mechanism is used. Roughly explained, the open loop part is used to set a point of operation, around which the closed loop component operates. Different parameters (targets and ‘partial […]

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HOW IS DOWNLINK POWER CONTROL USED IN LTE?

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The simple answer is, there is no power control in the downlink for LTE. However, power control or power boosting can be applied on both data and control channels of LTE in the downlink. The downlink data channel of LTE is PDSCH and the downlink control channels of LTE are: PBCH PDCCH PCFICH PHICH Data […]

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WHY IS BLINDING DECODING USED FOR PDCCH ?

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Each PDCCH supports multiple formats and the format used is usually unknown to the UE. Therefore, the terminal needs to blindly detect the format of the PDCCHs by decoding each format individually. Well, that may be okay for smaller bandwidth scenarios such as 1.4 MHz, 3 MHz etc. However, with bigger bandwidth markets such as […]

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