The effective Eb/No and hence the spectral efficiency depend on BLER. However there are QoS requirements which also have to be considered. Taking both into account leads to a target BLER. AMC is in use in order to tune BLER so that the target value is reached. Therefore when channel conditions change modulation and/or coding … Read more
Higher data rates: Obviously this is a general requirement requested from any new system. Quality of service, Lower delay: To enable true convergence between real-time and non-real-time services quality of service awareness is of absolute importance. This must already be paid attention to during the design of the physical layer. So LTE/EPC will be QoS … Read more
Fully packet-oriented mobile broadband network providing: – Peak data rates of 100 Mbps (DL) and 50 Mbps (UL) – Very low latency – Seamless and lossless handover – Sophisticated QoS to support important real time applications such as voice, video and interactive gaming – Support for terminal speeds of 150-500 Km/h and cell ranges of … Read more
3G is new upgraded cdma technology, in simple word its Wide band Code Devision Multiple Access Technology (WCDMA). This is first technology in which video call possible means voice and data simultaneously transmitted and received between mobile or data card and BTS – Base Transmission Station. WCDMA Having Below Characterictics Support two basic modes: FDD and … Read more
Interference is dependent on time, frequency and mobile location. Without frequency hopping, some cell planning margins must be incorporated so that sufficient service quality can still be provided in an interfered situation. By changing frequency on every TDMA frame, a mobile only experiences interference on a particular frequency once in a number of hops. Similarly, … Read more
ABI Research’s latest forecasts for femtocells estimate largely flat volume shipments in 2012 relative to 2011. The shipments in 2012 are expected to contain 2.44 million units, similar to the 2.47 million units shipped in 2011. In total, ABI Research estimates 5.3 million units will be deployed by end 2012. “We believe there is a … Read more
Below types of information carries By Logical Channel in LTE Control Channels Broadcast Control Channel (BCCH) :used for transmission of system information from the network to all UEs in a cell. Paging Control Channel (PCCH) :used for paging of UEs whose location on cell level is not known to the network. Common Control Channel (CCCH) … Read more
Inter-cell interference coordination (ICIC) in LTE To aid downlink ICIC Relative narrowband transmission-power indicator A cell can provide this information to neighboring cells, indicating the part of the bandwidth where it intends to limit the transmission power. A cell receiving the indication can schedule its downlink transmissions within this band, reducing the output power or … Read more
When the handset first powers up, it does an exhaustive search for the best pilot. No windows are used in this process. On the paging channel, the handset learns the window sizes SRCH_WIN_A, N, R and uses them when looking for neighbors both in idle mode and during calls. When a strong neighbor is requested … Read more
It is “soft”, meaning that communication is not interrupted by the handoff. This is sometimes called “make before break.” This means fewer dropped calls for users and higher customer satisfaction for operators. The handoff is not abrupt, but rather it is a prolonged call state during which there is communication via two or more base … Read more