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How Advanced is LTE Advanced.pdf

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MobileComm Professionals Inc. How Advanced is LTE Advanced? – RF Aspects & Challenges Jasminder Sahni, BE (E&C) LTE became a commercial reality in 2010 following the launch of many LTE networks using 3G/LTE multimode devices. LTE Advanced is the next major milestone in the evolution path, encompassing 3GPP Rel. 10, 11 and beyond. In order to achieve higher data rates while preserving c
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   MobileComm Professionals Inc .   How Advanced is LTE Advanced? RF Aspects Challenges Jasminder Sahni, BE (E&C) LTE became a commercial reality in 2010 following the launch of many LTE networks using 3G/LTE multimode devices. LTE Advanced is the next major milestone in the evolution path, encompassing 3GPP Rel. 10, 11 and beyond. In order to achieve higher data rates while preserving compatibility with older LTE standards, the designers of LTE-Advanced had to use some relatively advanced techniques. Larger amounts of radio frequency spectrum may be utilized in addition to new techniques for more efficient use of limited spectrum. Devices compatible with the new technology are likely to feature a number of antenna arrays, and a process called beam-forming can turn would-be interference into a tool to boost signal.    Worldwide functionality & roaming    Compatibility of services    Interworking with other radio access systems   MobileComm Professionals Inc .      Enhanced peak data rates to support advanced services and applications (100 Mbit/s for high and 1 Gbit/s for low mobility) We here are evaluating the radio parameters and performance from the RF aspects. Radio Parameters Carrier Aggregation Using a scheme known as carrier aggregation, a cellular base station can break apart a stream of data and transmit it through multiple radio frequencies to a user’s device, which then reassembles these multiple pieces into the srcinal data stream.    Support wider transmission bandwidths up to 100MHz    Two or more component carriers (CC) are aggregated     A terminal may simultaneously receive one or multiple component carriers depending on its capabilities    Possible to aggregate a different number of component carriers of possibly different bandwidths in the UL and the DL In typical TDD deployments, the number of component carriers and the bandwidth of each component carrier in UL and DL will be the same.    Both Intra and Inter band carrier aggregation are considered as potential Tx RF scenarios and parameters and cover both of; Contiguous Component Carrier and non-contiguous Component Carrier aggregation   MobileComm Professionals Inc .   Enhanced uplink multiple access LTE-Advanced enhances the uplink multiple access scheme by adopting clustered SC-FDMA, also known as discrete Fourier transform spread OFDM (DFT-S-OFDM). This scheme is similar to SC-FDMA but has the advantage that it allows noncontiguous (clustered) groups of subcarriers to be allocated for transmission by a single UE, thus enabling uplink frequency-selective scheduling and better link performance. Clustered SC-FDMA was chosen in preference to pure OFDM to avoid a significant increase in PAPR. It will help satisfy the requirement for increased uplink spectral efficiency while maintaining backward-compatibility with LTE. Enhanced multiple antenna transmission To improve single user peak data rates and to meet the ITU-R requirement for spectrum efficiency, LTE-Advanced specifies up to eight layers in the downlink which, with the requisite eight receivers in the UE, allows the possibility in the downlink of 8x8 spatial   MobileComm Professionals Inc .   multiplexing. The UE will be specified to support up to four transmitters allowing the possibility of up to 4x4 transmission in the uplink when combined with four eNB receivers. Coordinated multipoint transmission and reception (CoMP)  Another technique known as coordinated multipoint transmission/reception employs multiple base stations to simultaneously send and receive data to a single device. This can be especially beneficial to customers who are on the edge of a particular base station’s coverage area; by combining two base stations, a faster and more reliable connection can be achieved. Multiple LTE-Advanced base stations can even be used in a relay, with each base station transmitting information to the next. LTE Advanced UE Receivers and Categories The following aspects to be defined considering the CA scenarios, bandwidth of the Tx/Rx signals as well as multiple antenna effects:    Receiver Sensitivity    Selectivity    Blocking performance    Spurious response    Intermodulation performance    Spurious emission The existing UE categories 1-5 for Release 8 and Release 9 are shown in below table. In order to accommodate LTE-Advanced capabilities, three new UE categories 6-8 have been defined.
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