4G-LTE Optimization Part-1

/4G-LTE Optimization Part-1

Coverage Optimization Data

2018-12-31T13:36:28+00:00

Coverage Optimization Data- LTE RF Optimization Coverage Optimization Data During the time of initial deployment, when the number of subscriber data points are low, the preferred data source is LTE scanner logs due to their resolution and precision, and the volume of measurements they contain. The scanner has a distinct advantage over UE logs because the scanner is permitted to scan all DL RS. If scanner data is not available, then UE logs can be used instead. Propagation prediction plots also can be used, though their predictive nature limits their usefulness. On the other hand, eNB logs are also [...]

Coverage Optimization Data 2018-12-31T13:36:28+00:00

Reference Signal (RS) Pollution Scenarios

2018-12-28T12:32:56+00:00

Reference Signal (RS) Pollution Scenarios- LTE RF Optimization Typical Reference Signal (RS) Pollution Scenarios DL RS pollution is a situation in which there are two or more additional cells with DL RS of comparable values to the serving cell. The difference in dB of these signals determine how bad the pollution is. RS Pollution can happen throughout a network. Dense urban areas (where coverage tends to be good) tend to have more sites in close proximity, so there is opportunity for under-optimized sites to show up in unintended areas. In suburban areas, cells tend to be farther apart (larger [...]

Reference Signal (RS) Pollution Scenarios 2018-12-28T12:32:56+00:00

Reference Signal Pollution with example

2018-12-28T13:22:04+00:00

Reference Signal Pollution with example- LTE RF Optimization Reference Signal Pollution with example The concept of Reference Signal (RS) pollution is new in the industry; some engineers still refer to RS pollution as pilot pollution (a term inherited from 3G systems). In general, it is known that RS pollution is bad but it is important to keep in mind the reasons why it is bad. For this workshop, assume the definition of DL RS pollution is a situation in which there are two or more additional cells with DL RS of comparable values to the serving cell. The difference [...]

Reference Signal Pollution with example 2018-12-28T13:22:04+00:00

What limits the Coverage?

2018-12-26T11:07:40+00:00

What limits the Coverage? - LTE RF Optimization What limits the Coverage? Downlink coverage is limited by the maximum amount of power that can be applied to the downlink reference signals. However, the LTE standards do not specify how much power the various channels and reference signals should use; instead it is up to the eNB vendor to develop the appropriate algorithms and controls. In general, the goal is to keep a constant Energy Per Resource Element (EPRE) so that the UEs can use RS measurements to estimate the power of other downlink channels. However, the EPRE is not [...]

What limits the Coverage? 2018-12-26T11:07:40+00:00

What is “Right” Coverage?

2018-12-22T11:26:10+00:00

What is “Right” Coverage? What is “Right” Coverage? When tuning for coverage, it is important to create the right coverage at the right location. The right coverage includes: Elimination of coverage gaps: As coverage is tuned, it is important not to open coverage holes. The UE should have enough power to transmit all UL channels (Demodulating Reference Signal (DM RS), PUCCH and/or PUSCH) successfully to the eNB. Minimization of pollution: Although definitions vary, RS pollution can be described generally as the state in which three or more additional RS are received at a location at roughly the same strength. [...]

What is “Right” Coverage? 2018-12-22T11:26:10+00:00

Coverage Analysis- LTE Coverage Optimization

2018-12-28T13:29:19+00:00

Coverage Analysis- LTE Coverage Optimization Coverage Analysis- LTE Coverage Optimization LTE may use a variety of frequency planning options. Examples include frequency reuse of 1 (N=1), static partial frequency reuse and soft frequency reuse. However, due to spectrum availability, current implementations and deployment scenarios utilize N=1 frequency reuse, hence, inter-cell interference is an ever present issue. System performance and overall service quality are directly related to the degree to which interference can be controlled. However, some cell overlap is desirable to ensure the reliability of handoff between cells, and to accommodate load. Unfortunately, cell overlap decreases the amount of [...]

Coverage Analysis- LTE Coverage Optimization 2018-12-28T13:29:19+00:00

UE Measurement- Signal to Interference Plus Noise Ratio (SINR)

2018-12-28T13:16:12+00:00

UE Measurement- Signal to Interference Plus Noise Ratio (SINR) UE Measurement- Signal to Interference Plus Noise Ratio (SINR) Due to the small range variability of RSRQ, coverage may not be determined based on this metric only. It can be used as an auxiliary metric for handover decisions, but it lacks enough range changes to be used to determine coverage. In order to address this issue, Reference Signal – Signal to Interference Plus Noise Ratio (RS-SINR) can be used to measure the SINR of the resource elements that carry the reference signals. This metric, not defined in the standard, helps [...]

UE Measurement- Signal to Interference Plus Noise Ratio (SINR) 2018-12-28T13:16:12+00:00

UE Measurement- Reference Signal Received Quality (RSRQ)

2018-12-17T11:12:33+00:00

UE Measurement- Reference Signal Received Quality (RSRQ) UE Measurement- Reference Signal Received Quality (RSRQ) RSRP measures the average received power of the reference signals. It is a Received Signal Strength (RSSI)- type of measurement. It does not provide information about interference. In some areas, even though the RSRP is high, the ultimate user experience may not be good since the interference is also high. In order to address this issue, Reference Signal Received Quality (RSRQ) is defined to measure C/I of the reference signal. In the equation, the numerator represents the received power of reference signal. The “N” is [...]

UE Measurement- Reference Signal Received Quality (RSRQ) 2018-12-17T11:12:33+00:00

UE Measurement- Reference Signal Received Power (RSRP)

2018-12-15T12:36:42+00:00

UE Measurement- Reference Signal Received Power (RSRP) UE Measurement- Reference Signal Received Power (RSRP) Reference Signal Received Power (RSRP) is measured by a UE during the procedure of cell selection, cell reselection in idle mode, and handover, and is an important factor in decision making. RSRP linear measures the average power of resource elements over cell-specific reference signals. When the eNB configures the measurement, it usually gives the measurement bandwidth. The measurement is usually carried on antenna port 0 of the eNB, although an eNB may use multiple antennas, in which case there are reference signals transmitting from each [...]

UE Measurement- Reference Signal Received Power (RSRP) 2018-12-15T12:36:42+00:00

Cell-specific DL Reference Signal

2018-12-13T12:48:17+00:00

Cell-specific DL Reference Signal Cell-specific DL Reference Signal A downlink (DL) Reference Signal (RS) is inserted into the resource blocks and transmitted together with data. Since the RS is known to both the eNb and UE, the UE will use the RS to estimate the channel condition first, then demodulate the data based on the estimated channel response. As shown in figure, each RS occupies one resource element and is distributed in both the time and frequency domains. This two dimension distribution helps with the accuracy of channel estimation. The channel condition varies from time to time and from [...]

Cell-specific DL Reference Signal 2018-12-13T12:48:17+00:00
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