What is cell individual offset LTE?
Parameters Definition 1) Cell Individual Offset (CIO): This is a measurement quantity used to determine cell association, regulate cell coverage and usually incorporated in power measurement to control handover.
What is offset in LTE?
Offset: if the parameter is set to a large value, an intra-frequency handover is performed only when the signal of the neighboring cell is significantly better than that of the serving cell. *Oneigh, freq: indicates the frequency-specific offset for the inter-frequency neighboring cell.
What is TTT in LTE?
The LTE standard supports several parameters to trigger the handover and select the target cells, such as hysteresis margin and Time-to-Trigger (TTT). This parameter can decrease the number of unnecessary handovers and effectively avoid Ping-Pong effects.
What is Ping-Pong handover in LTE?
Handover (HO) technique in LTE networks suffers from Ping-pong movement. Ping-pong HO can reduce the quality of the mobile user’s connection and increases the numbers of handovers which in turn raises the network load and generally degrades the network performance.
What is LTE MRO?
Mobility Robustness Optimization (MRO) encompasses the automated optimization of parameters affecting active mode and idle mode handovers to ensure good end-user quality and performance, while considering possible competing interactions with other SON features such as, automatic neighbor relation and load balancing.
What is cell reselection in LTE?
Cell Re selection is a procedure used to change the cell after the UE is camped on a cell and stays in the Idle mode. This procedure is used to let the UE get camped on a cell which has the best radio conditions among all the other cells on which the UE is allowed to camp on.
What is handover hysteresis?
The handover is initiated if the link quality of another cell is better than the current link quality. The difference in link quality is called the hysteresis value. It is used to avoid ping-pong effects. However, it can increase handover failure since it can also prevent necessary handovers.
What is time to trigger?
Time-to-trigger (TTT) A TTT is the time during which the specific criteria for an event needs to be met in order to trigger a measurement report. The values are 0, 40, 64, 80, 100, 128, 160, 256, 320, 480, 512, 640, 1024, 1280, 2560, and 5120 ms. 3.2. Evaluation of TTT.
What is ping pong effect in wireless communication?
The ping-pong handover means handover to and fro between a cell pair frequently. The ping-pong effect occurs due to the frequent movement of mobile units between the cell pair, or high signal fluctuation at the common boundary of the cell pair.
What is early handover?
Definition and detection of MRO events Too early handover: RLF occurs shortly after a successful handover to the target cell, and then UE reconnect to the serving cell.
What is mobility robustness optimization?
What is a cell LTE?
LTE stands for Long Term Evolution and is sometimes referred to as 4G LTE. It’s a standard for wireless data transmission that allows you to download your favorite music, websites, and video really fast—much faster than you could with the previous technology, 3G.
How are neighbor cells measured in LTE UE?
Unlike GSM and WCDMA UE don’t perform periodic measurements of neighbor cells. Measurement based reporting used in LTE to trigger handover. By default, user equipment in the LTE network detect suitable neighbor cells without the assistance of a list of neighbor cells sent by the serving RBS.
Which is the underlying data carrier for an LTE frame?
The underlying data carrier for an LTE frame is the resource element (REResource Element, 1 subcarrier x 1 OFDM symbol; the smallest data unit in LTE holding one complex IQ value per antenna port).
What are the time synchronization requirements for LTE?
– UTRA-TDD and LTE-TDD (small cell) need an accuracy of 1 – 1.5 microseconds. – In some configurations, WiMAX-TDD and LTE-A have additional requirements below 1 microsecond. – A feature in LTE-A may require time sync below 1 microsecond (discussed later) Thanks to Adam Wertheimer, Microsemi Co. for this information.
What does fn stand for in LTE event measurement?
Fn = updated filtered measurement result Fn-1 = previous filtered measurement result a = (1/2)k/4 , where k is appropriate filter coefficient MEASn = latest measurement result received from PHYSICAL layer Filter coefficient can be configured independently for LTE RSRP, LTE RSRQ, UMTS CPICH RSCP, UMTS CPICH Ec/Io and GSM RSSI.