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, 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.

Power headroom

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The UE transmission power for the current subframe is determined by Eq. Additional information Competing interests Power headroom authors declare that they have no competing interests. By using Eqs.

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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.

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Article Google Scholar. 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 ]. Because of the lower value of the pathloss, which needs to be compensated owing to the short distance between the HeNB and the FUE, the transmission power of the FUE is rarely constrained by P max. When the base station receives the PH report from the UE, P tx i —1 , which is the transmission power of the UE in the previous subframe, is calculated as. Metrics details. This causes inefficient use of power resources. If the UE reports the positive PH, the base station can consider that it is possible for the UE to increase its transmission power. Full size image. Table 3 Simulation parameters Full size table. Next-Generation Netw. 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. Owing to the dynamic variation of the channel caused by the fading effect, it is seen in Fig. J Wireless Com Network ,

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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. Received : 01 June The TPC command value selection procedure can be seen in the flowchart of Fig. At the same time, the UE transmitting with maximal transmission power causes severe inter-cell interference to the neighboring cells, resulting in performance degradation in the uplink. The initial value of P 0 for the MUE is also used for the macro only case. About this article. In a conventional homogeneous network—i. Because of the lower value of the pathloss, which needs to be compensated owing to the short distance between the HeNB and the FUE, the transmission power of the FUE is rarely constrained by P max. Google Scholar. The maximum number of users in a cell when the fading exists is defined as Eq. Additional information Competing interests The authors declare that they have no competing interests.