Advanced – LTE Release10 was to provide higher bitrates in a cost efficient way and, at the same time, completely fulfil the requirements set by ITU for IMT Advanced, also referred to as 4G. Increased peak data epc and 4g packet networks pdf, DL 3 Gbps, UL 1.
Improved performance at cell edges, e. DL 2×2 MIMO at least 2. Carrier Aggregation The most straightforward way to increase capacity is to add more bandwidth. Carrier aggregation can be used for both FDD and TDD. Each aggregated carrier is referred to as a component carrier.
The component carrier can have a bandwidth of 1. 4, 3, 5, 10, 15 or 20 MHz and a maximum of five component carriers can be aggregated. Hence the maximum bandwidth is 100 MHz. The number of aggregated carriers can be different in DL and UL, however the number of UL component carriers is never larger than the number of DL component carriers. R9 UEs can be allocated resources on any ONE of the CCs.
The CCs can be of different bandwidths. This might not always be possible, due to frequency allocation scenarios. For non-contiguous allocation it could either be intra-band, i. When carrier aggregation is used there is a number of serving cells, one for each component carrier. In the inter-band CA example shown in figure 3, carrier aggregation on all three component carriers is only possible for the black UE, the white UE is not within the coverage area of the red component carrier. The different serving cella may have different coverage. Two different data streams are transmitted on two TX antennas and received by two RX antennas, using the same frequency and time, separated only by the use of different reference signals.
One or two transport blocks are transmitted per TTI. To be able to adjust the type of multi-antenna transmission scheme, according to e. Through the introduction of TM9 8×8 MIMO is supported DL, and through the introduction of TM2 UL use of 4×4 MIMO UL is enabled. Naturally it is also required that the UE support this. UE category 8 supports the maximum number of CC and 8×8 spatial multiplexing. In multi-antenna techniques precoding is used to map the modulation symbols onto the different antennas. The type of precoding depends on the multi-antenna technique used as well as on the number of layers and the number of antenna ports.