Power headroom

Metrics details. Generally, the cell edge UE has a higher probability to be constrained by the maximum transmission power level owing to the compensation of the large pathloss. When the UE transmission power is constrained by the maximum level, allocating a higher number of physical resource blocks PRBs power headroom the UE power capability can afford will reduce the transmission power to be allocated per PRB, resulting in inefficient use of power resources, power headroom.

It represents the difference between the maximum transmit power level supported by a mobile device and the actual power level being used by the device during a communication session. The power headroom value is a critical parameter that is monitored by the network to ensure optimal performance and reliable communication. In wireless networks, each mobile device needs to transmit its signals to the base station with a certain power level to establish and maintain a connection. The transmit power level depends on several factors, including the distance between the mobile device and the base station, the quality of the wireless channel, and interference from other devices. The network assigns a specific power level to each device to maintain a satisfactory level of signal quality and coverage. However, the power level required for communication can vary depending on the specific conditions. For example, when a mobile device is close to the base station or experiences favorable channel conditions, it may not need to use its maximum transmit power.

Power headroom

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Metrics details. Generally, the cell edge UE has a higher probability to be constrained by the maximum transmission power level owing to the compensation of the large pathloss. When the UE transmission power is constrained by the maximum level, allocating a higher number of physical resource blocks PRBs than the UE power capability can afford will reduce the transmission power to be allocated per PRB, resulting in inefficient use of power resources. To avoid this power inefficiency, the uplink transmission power can be controlled according to the number of PRBs allocated using the power headroom report-based power efficient resource allocation PHR-PERA scheme proposed in this paper. Furthermore, adaptive open-loop power control OL-PC based on the signal-to-interference-plus-noise ratio SINR and the uplink interference is used to improve the cell capacity. Additional gains of However, the inter-cell interference problem remains to be solved because the band allocated to a user in a cell can be used by another user in any of the neighboring cells. In a conventional homogeneous network—i. The FPC scheme partially compensates for the pathloss such that users with high pathloss will operate at a low SINR requirement, thus reducing interference caused to the neighboring cells. In the overload indicator OI -based uplink power control proposed in [ 5 ], the base station measures the uplink interference and sends the OI to the neighboring base stations to broadcast its interference situation.

Power headroom

By knowing the power headroom of each UE, the eNodeB can make informed decisions regarding resource allocation and power control, ensuring efficient and reliable communication. It is a compact entity with a fixed size and comprises a solitary octet, which is defined as follows refer to figure 6. Figure 6. E phr-Config. It helps to prevent excessive reporting when certain events occur in quick succession. It can vary in size and is defined in Figure 6. Subscribe now to keep reading and get access to the full archive. Type your email…. Continue reading. May 19, May 19, techlteworld.

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In the re-allocation, the number of PRBs determined in the pre-allocation stage is allocated to the UE that has not reported its PH to the base station. In [ 10 ], the target received power is controlled based on the interference generated to neighboring cells by exchanging the closed-loop commands under the HetNet environment. Anyone you share the following link with will be able to read this content:. The FPC scheme partially compensates for the pathloss such that users with high pathloss will operate at a low SINR requirement, thus reducing interference caused to the neighboring cells. The system parameters are shown in Table 3. The network continuously monitors the power headroom of each device to ensure that it remains above a certain threshold. Generally, the cell edge UE has a higher probability to be constrained by the maximum transmission power level owing to the compensation of the large pathloss. Additional information Competing interests The authors declare that they have no competing interests. It is a critical parameter that is monitored by the network to ensure optimal performance and reliable communication. It is modeled by using lognormal distribution with a mean of 0 dB and standard deviation of 4 dB for the link between the HeNB and the UE [ 12 ].

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Download references. Generally, as P 0 increases, the uplink interference and user increase at the same time until the interference level does not exceed a certain value [ 3 ]. Power headroom PH is reported by the UE to the base station to broadcast how much power the UE required in the previous subframe. About this article. Download PDF. Download citation. The power headroom value is a critical parameter that is monitored by the network to ensure optimal performance and reliable communication. Maintaining an adequate power headroom is crucial for maintaining the quality of service in a wireless network. When the UE transmission power is constrained by the maximum level, allocating a higher number of physical resource blocks PRBs than the UE power capability can afford will reduce the transmission power to be allocated per PRB, resulting in inefficient use of power resources. The pathloss between the indoor UE and the outdoor base station includes additional wall loss of 20 dB. As the transmission power is set as maximum, the high value of cumulative distribution function CDF region, which is the cell interior user throughputs, is higher than the case of with power control. However, less literature has considered the bandwidth allocated to the user for controlling the uplink transmission power. By combining these measurements and parameters, the network can dynamically adjust the transmit power of each device to maintain an optimal balance between coverage, capacity, and power consumption.