Bibliografie tematiche / Uplink

Letteratura scientifica selezionata sul tema "Uplink"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 maggio 2024

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Articoli di riviste sul tema "Uplink"

Kim, Hwangnam, Woonghee Lee, Hyunsoon Kim, Hwantae Kim e Jaehyeuk Michael Yang. "Protecting Download Traffic from Upload Traffic over Asymmetric Wireless Links". Wireless Communications and Mobile Computing 2018 (12 luglio 2018): 1–15. http://dx.doi.org/10.1155/2018/1283420.

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Many varied mobile device networks have been developed with the advancement of communication and network technologies. Cellular data networks are currently the most widely used, and the number of cellular network subscriptions has increased steadily. Most recent wireless access technologies employ asymmetric uplinks and downlinks because mobile subscribers usually download contents from the Internet. Therefore, most cellular network service providers allocate more bandwidth to downlinks than uplinks for mobile subscribers. However, this asymmetry can have unexpected influence on network performance, particularly TCP performance. When the uplink interface is congested, TCP ACK packets are delayed by TCP data packets on the uplink, causing considerable TCP retransmissions on the downlink channel. Thus, downlink bandwidth cannot be fully utilized, which results in significantly degraded downlink throughput. To resolve this problem, this paper proposes a feedback scheme, network traffic chunk regulator (NCR). We analyzed the aforementioned problem through the empirical study, and we designed and implemented NCR based on the analysis. NCR adaptively controls TCP according to the degree of link usage asymmetry. We evaluate NCR performance through simulations and experiments with real devices. We verify that the proposed scheme allows the downlink traffic to not interfere with the aggressive uplink traffic. Thus, NCR increases total link utilization and aggregated throughput significantly, without imposing additional overhead on base or mobile stations.

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Jiang, Jian-feng, e Hui-jie Ding. "Uplink Spectrum Overlay Coverage Enhancement Algorithm in 5G Network". Mathematical Problems in Engineering 2021 (22 dicembre 2021): 1–8. http://dx.doi.org/10.1155/2021/9724623.

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The imbalance between the uplink and downlink rates and coverage of the 5G network has led to limited vertical industry services. Aiming at breaking the imbalance between the uplink and downlink rates and improving the coverage of 5G network, a uplink coverage enhancement algorithm is designed from the aspects of networking mode, bandwidth, uplink and downlink subframe ratio, etc. It uses high- and low-frequency time-frequency joint scheduling to enable uplink full-time slot scheduling, thereby improving uplink coverage and rate. According to the actual test on the live network, the results show that the super-uplink algorithm can increase the near-point uplink rate by 15% to 30%, increase the uplink rate for indoor midpoint scenarios by 40% to 80%, and increase the uplink rate for outdoor and indoor weak spot scenarios by 100% to 400%.

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Liu, Qingli, Jiaxu Sun e Peiling Wang. "Uplink Assisted MIMO Channel Feedback Method Based on Deep Learning". Entropy 25, n. 8 (27 luglio 2023): 1131. http://dx.doi.org/10.3390/e25081131.

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In order to solve the problem wherein too many base station antennas are deployed in a massive multiple-input–multiple-output system, resulting in high overhead for downlink channel state information feedback, this paper proposes an uplink-assisted channel feedback method based on deep learning. The method applies the reciprocity of the uplink and downlink, uses uplink channel state information in the base station to help users give feedback on unknown downlink information, and compresses and restores the channel state information. First, an encoder–decoder structure is established. The encoder reduces the network depth and uses multi-resolution convolution to increase the accuracy of channel state information extraction while reducing the number of computations relating to user equipment. Afterward, the channel state information is compressed to reduce feedback overhead in the channel. At the decoder, with the help of the reciprocity of the uplink and downlink, the feature extraction of the uplink’s magnitudes is carried out, and the downlink channel state information is integrated into a channel state information feature matrix, which is restored to its original size. The simulation results show that compared with CSINet, CRNet, CLNet, and DCRNet, indoor reconstruction precision was improved by an average of 16.4%, and outside reconstruction accuracy was improved by an average of 21.2% under all compressions.

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Kim, Yonggang, Gyungmin Kim, Youngwoo Oh e Wooyeol Choi. "Transmission Delay-Based Uplink Multi-User Scheduling in IEEE 802.11ax Networks". Applied Sciences 11, n. 19 (2 ottobre 2021): 9196. http://dx.doi.org/10.3390/app11199196.

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As the demands for uplink traffic increase, improving the uplink throughput has attracted research attention in IEEE 802.11 networks. To avoid excessive competition among stations and enhance the uplink throughput performance, the IEEE 802.11ax standard supports uplink multi-user transmission scenarios, in which AP triggers certain stations in a network to transmit uplink data simultaneously. The performance of uplink multi-user transmissions highly depends on the scheduler, and station scheduling is still an open research area in IEEE-802.11ax-based networks. In this paper, we propose a transmission delay-based uplink multi-user scheduling method. The proposed method consists of two steps. In the first step, the proposed method makcreateses station clusters so that stations in each cluster have similar expected transmission delays. The transmission delay-based station clustering increases the ues of uplink data channels during the uplink multi-user transmission scenario specified in IEEE 802.11ax. In the second step, the proposed method selects cluster for uplink multi-user transmissions. The cluster selection can be performed with a proportional fair-based approach. With the highly channel-efficient station cluster, the proposed scheduling method increases network throughput performance. Through the IEEE 802.11ax standard compliant simulations, we verify the network throughput performance of the proposed uplink scheduling method.

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Cho, Sunghyun, Ji-Su Kim e Jae-Hyun Kim. "Enhanced Handoff Scheme for Downlink-Uplink Asymmetric Channels in Cellular Systems". Scientific World Journal 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/241483.

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In the latest cellular networks, data services like SNS and UCC can create asymmetric packet generation rates over the downlink and uplink channels. This asymmetry can lead to a downlink-uplink asymmetric channel condition being experienced by cell edge users. This paper proposes a handoff scheme to cope effectively with downlink-uplink asymmetric channels. The proposed handoff scheme exploits the uplink channel quality as well as the downlink channel quality to determine the appropriate timing and direction of handoff. We first introduce downlink and uplink channel models that consider the intercell interference, to verify the downlink-uplink channel asymmetry. Based on these results, we propose an enhanced handoff scheme that exploits both the uplink and downlink channel qualities to reduce the handoff-call dropping probability and the service interruption time. The simulation results show that the proposed handoff scheme reduces the handoff-call dropping probability about 30% and increases the satisfaction of the service interruption time requirement about 7% under high-offered load, compared to conventional mobile-assisted handoff. Especially, the proposed handoff scheme is more efficient when the uplink QoS requirement is much stricter than the downlink QoS requirement or uplink channel quality is worse than downlink channel quality.

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Wieser, Vladimir, e Tomas Marek. "UMTS uplink simulator". Communications - Scientific letters of the University of Zilina 6, n. 4 (31 dicembre 2004): 58–62. http://dx.doi.org/10.26552/com.c.2004.4.58-62.

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Zhang, Lan, Weili Nie, Gang Feng, Fu-Chun Zheng e Shuang Qin. "Uplink Performance Improvement by Decoupling Uplink/Downlink Access in HetNets". IEEE Transactions on Vehicular Technology 66, n. 8 (agosto 2017): 6862–76. http://dx.doi.org/10.1109/tvt.2017.2653799.

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Ma, Tao, Yanfeng Hu, Zhenqi Fan, Xinjiang Xia e Dongming Wang. "Performance Analysis of Cell-Free Massive MIMO System with Network-Assisted Full-Duplex under Time-Shifting Pilot Scheme". Electronics 11, n. 14 (11 luglio 2022): 2171. http://dx.doi.org/10.3390/electronics11142171.

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A network-assisted full-duplex (NAFD) system based on a cell-free (CF) massive multiple-input, multiple-output (MIMO) framework has been proposed to satisfy the demands of higher data transmission rates and efficient communication. However, pilot contamination may occur due to the reuse of pilot sequences in a massive MIMO. With this consideration, we raise an asynchronous channel estimation method based on an uplink and downlink time-shifting pilot-sending scheme, which is able to avoid pilot sequence reuse when obtaining channel state information (CSI), while the data signals could be transmitted simultaneously at the same frequency. The transmission processes of the proposed method above are divided into three phases, including pilot phase, estimation phase, and data phase, in chronological order. When the uplink is in pilot phase, the corresponding downlink is in data phase and vice versa. After the channel state information estimation, both uplinks and downlinks are in data phase. The maximum ratio combination (MRC) receiver and the maximum ratio transmission (MRT) precoding are adopted in the uplink and downlink. The closed-form expressions are derived based on large-scale random matrix theory. We compared our asymptotic results with practical results in simulation, and find that they are well matched. Moreover, the proposed method is superior to the normal time-division duplex (TDD) system.

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Haider, Amir, e Seung-Hoon Hwang. "Maximum Transmit Power for UE in an LTE Small Cell Uplink". Electronics 8, n. 7 (16 luglio 2019): 796. http://dx.doi.org/10.3390/electronics8070796.

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Abstract (sommario):

To furnish the network with small cells, it is vital to consider parameters like cell size, interference in the network, and deployment strategies to maximize the network’s performance gains expected from small cells. With a small cell network, it is critical to analyze the impact of the uplink power control parameters on the network’s performance. In particular, the maximum transmit power (Pmax) for user equipment (UE) needs to be revisited for small cells, since it is a major contributor towards interference. In this work, the network performance was evaluated for different Pmax values for the small cell uplink. Various deployment scenarios for furnishing the existing macro layer in LTE networks with small cells were considered. The Pmax limit for a small cell uplink was evaluated for both homogenous small cell and heterogeneous networks (HetNet). The numerical results showed that it would be appropriate to adopt Pmax = 18 dBm in uniformly distributed small cells rather than Pmax = 23 dBm, as in macro environments. The choice of Pmax = 18 dBm was further validated for three HetNet deployment scenarios. A decrease of 0.52 dBm and an increase of 0.03 dBm and 3.29 dBm in the proposed Pmax = 18 dBm were observed for the three HetNet deployments, respectively. Furthermore, we propose that the fractional power control mode can be employed instead of the full compensation mode in small cell uplinks.

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Zhang, De Ming, Sheng Yao e Xiao Wen Li. "Research and Implementation of Uplink Synchronization in TD-LTE". Advanced Materials Research 756-759 (settembre 2013): 846–50. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.846.

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To make sure a good communication between the terminal and the base station, synchronization is needed between them. The Uplink Time Alignment has been provided in the long term evolution system (TD-LTE), by which uplink synchronization can be maintained in terminals. In this letter, the concrete implementation of the Uplink Time Alignment in MAC sub-layer of terminals and independently adjustment of uplink timing were designed with research of the Uplink Time Alignment and detailed analysis of the specific applications of Timing Advance Command in the terminal. The proposed implementation can be applied for the development of test instrumentation and TD-LTE ratio frequency conformance.

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Più fonti

Tesi sul tema "Uplink"

Baby, Johnson. "LTE UPLINK MODELLING AND ANALYSIS OF CARRIER FREQUENCY OFFSET ON UPLINK TRANSMISSION INTERFERENCE". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-24015.

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This master thesis analyzes the effect of Carrier Frequency Offsets (CFO) on LTEuplink transmission, which is the main cause of ICI (Inter Carrier Interference) andMAI (Multiuser Access Interference). A model of the LTE uplink is required toconduct the study and is implemented in MATLAB, in compliance with 3GPPspecifications. The model can generate uplink signal as generated by the UE, (UserEquipment) and it supports multiple channel bandwidths described by the 3GPP.The channel estimation is done with the help of block type pilots. The model is usedto simulate the experimental conditions. The presence of CFO results in poor systemperformance. Therefore, many algorithms have been proposed for the CFOcancellation such as Successive Interference Cancellation (SIC), Parallel InterferenceCancellation (PIC) and Inverse Interference Matrix Cancellation. As the topic is verybroad, I investigate the performance of Inverse Interference Matrix Cancellationalgorithm. Compared with the other CFO cancellation algorithms this algorithm candirectly estimate the interference components from the inverse pilot matrix, thusthere is no need for CFO estimation. Simulation results show that the algorithm isvery effective in the presence of CFO. The channel estimation technique used is theLeast Square (LS) method and frequency selective channel is used for simulation.Performance graphs are plotted in terms of BER (Bit Error Rate) against differentvalues of SNR (Signal to Noise Ratio).

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Prasai, Sandesh. "Access control of NUTS uplink". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19209.

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Mehari, Tariku Temesgen. "Frequency Hopping in LTE Uplink". Thesis, Blekinge Tekniska Högskola, Avdelningen för telekommunikationssystem, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4232.

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In the 3GPP LTE, different radio resource management (RRM) techniques have been proposed in order to improve the uplink performance. Frequency hopping is one of the techniques that can be used to improve the uplink performance by providing frequency diversity and interference averaging. The hopping can be between subframes (inter-subframe) or within a subframe (intra-subframe). 3GPP specifies two types of frequency hopping for the LTE uplink, hopping based on explicit hopping information in the scheduling grant and sub-band based hopping according to cell-specific hopping and mirroring patterns. In this master’s thesis, theoretical discussion on the frequency hopping schemes is carried out followed by dynamic simulations in order to evaluate the performance gain of frequency hopping. Based on the theoretical analysis, the second type of hopping is selected for detailed study. As a baseline for comparison, dynamic frequency domain scheduling with random frequency resource allocation has been used. Single cell and multi-cell scenarios have been simulated with VoIP traffic model using user satisfaction as a performance metric. The simulation results show that frequency hopping improves the uplink performance by providing frequency diversity in the single cell scenario and both frequency diversity and interference averaging in the multi-cell scenario. The gains in using the hopping schemes were reflected as VoIP capacity (the number of satisfied users) improvement. In this study, the performance of the selected hopping schemes under different hopping parameters is also evaluated.
ttma07@student.bth.se tariku.temesgen.mehari@ericsson.com

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Ho, Kenneth T. "Uplink channel estimation in WiMAX". College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8214.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Persson, Markus. "Uplink TDMA Potential in WCDMA Systems". Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11399.

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The evolvement of the uplink in the third generation mobile telecommunication system is an ongoing process. The Enhanced Uplink (EUL) concept is being developed to meet the expected need from more advanced services, like video streaming and mobile broadband. One idea for further improvement in the EUL concept is to introduce Time Division Multiple Access (TDMA), which is studied in this master thesis.

The master thesis assignment is to study the consequences of introducing TDMA in EUL. The goal has been to identify the gains and problems, and how they can be handled. A derived theoretical framework and system simulations, using a radio network simulator, are used.

The overall conclusion is that there is a potentially large gain with an introduction of TDMA in EUL. Simulations in favorable conditions have shown that the system throughput can increase by 100% when there are only User Equipment (UE) that are using EUL in the system and by 50% when there is a mix of speech and EUL UE’s. When using TDMA the uplink load also shows improvements, the mean is generally higher but the variance is generally smaller.

Due to major differences in experienced interference between passive and active UE’s, the signal quality will vary a lot. The big variation in signal quality is identified as the main problem with introducing TDMA in EUL. It is shown that this problem can generate extreme high uplink load, which have a negative impact both on the resource efficiency and the coverage.

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Brännström, Nils. "Voice-over-IP over Enhanced Uplink". Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8479.

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The traditional voice service in mobile networks is an important service that mobile users expect high quality from. With the convergence of mobile networks towards an all-IP network, an IP-based speech service becomes important which is referred to as Voice-over-IP (VoIP). The traditional voice service is highly optimized and a VoIP service must therefore fulfil strict quality requirements to provide the same speech service quality. The air interface technology, WCDMA, which is used in third generation communication systems in Europe is constantly developed. An improved concept for the mobile-to-network transmission, called the Enhanced Uplink (EUL) provides for higher uplink capacity for packet data services. It also includes features that may provide a sufficient VoIP service quality in mobile networks, when considering the uplink transmission.

The purpose of this thesis is to evaluate the VoIP capacity over EUL and identify crucial aspects of radio resource management in order to increase the capacity. This is done through dynamic system simulations, using a realistic VoIP traffic model. The VoIP capacity is also estimated by a derived theoretical framework.\newline

It is shown by simulation results and theoretical estimations, that power control is a vital mechanism in order to increase the capacity. Simulation results indicate that a VoIP over EUL capacity of 65\% of the traditional voice service capacity may be reached. The results also indicate that to improve the capacity for larger cells, the allowed VoIP packet delay must be increased.

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Ahmed, Mohsin Niaz. "LTE Uplink Modeling and Channel Estimation". Thesis, Linköpings universitet, Datorteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69571.

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This master thesis investigates the uplink transmition from User Equipment (UE) to base station in LET (Long Term Evolution) and channel estimation using pilot symbols with parameter defined in 3GPP (3rd Generation Partnership Project) specifications. The purpose of the thesis was to implement a simulator which can generate uplink signal as it is generated by UE. The Third Generation (3G) mobile system was given the name LTE. This thesis focus on the uplink of LTE where single carrier frequency division multiple access (SC-FDMA) is utilized as a multiple access technique. The advantage over the orthogonal frequency division multiple access (OFDMA), which is used in downlink is to get better peak power characteristics. Because in uplink communication better peak power characteristic is necessary for better power efficiency in mobile terminals. To access the performance of uplink transmition realistic channel model for wireless communication system is essential. Channel models used are proposed by International Telecommunication Union (ITU) and the correct knowledge of these models is important for testing, optimization and performance improvements of signal processing algorithms. The channel estimation techniques used are Least Square (LS) and Least Minimum Mean Square Error (LMMSE) for different channel models. Performance of these algorithms has been measured in term of Bit Error Rate (BER) and Signal to Noise Ratio (SNR).

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Di, Shuang. "USB Attached Network Performance : Uplink Performance". Thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91529.

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More and more people all over the world are using a USB modem to connect to the Internet. This is especially true in Sweden- which has the highest 3G coverage in Europe. Comparable to fixed broadband access, using a 3G USB modem is a wonderful experience for the customer. Increasingly, anywhere we can use our cellular phone is a place that we are able to access the Internet, even if we are traveling in a train, walking in a park, or sitting on the beach. This makes working on the move much easier. However, customers do not know if the network throughput, delay, and the cost of connectivity match their needs. Additionally, there is also the question of the time to connect to the network when there has not been some traffic for a period of time. However, the throughput, delay, and "time to connect" when using such a modem to connect to a wireless network depend on several factors. In this thesis we will examine these factors. More specifically, the thesis will analyze in detail the effects of using a USB attached network interface, in order to gain greater understanding of such an interface’s network performance. We have chosen to focus on the uplink, as it was expected to have a low throughput and it has not had as much attention as the downlink performance.
Fler och fler människor över hela världen använder ett USB-modem för att ansluta tillInternet. Detta gäller i synnerhet i Sverige, som har den största 3G-täckning i Europa.Jämförbar med fast bredband, med hjälp av ett 3G USB-modemet är en underbar upplevelseför kunden. Allt var som helst vi kan använda vår mobiltelefon är en plats som vi hartillgång till Internet, även om vi färdas i ett tåg, promenad i en park, eller sitter på stranden.Detta gör att arbeta på resande fot mycket enklare. Men kunderna inte vet om nätetgenomströmning, fördröjning, och kostnaden för anslutning passar deras behov. Dessutomfinns det också en fråga om tid att ansluta till nätverket när det inte har funnits några trafikför en tid. Men den genomströmning, fördröjning och "tid för att ansluta" när du använderett modem för att ansluta till ett trådlöst nätverk beror på flera faktorer. I denna avhandlingkommer vi att undersöka dessa faktorer. Mer specifikt avhandlingen analyserar i detaljeffekterna av att använda en USB bifogade nätverkskort, för att få större förståelse för ettsådant gränssnitt nätverk prestanda. Vi har valt att fokusera på upplänk, eftersom detförväntas ha låg kapacitet och det har inte fått lika mycket uppmärksamhet som denerlänkning prestanda.

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Manssour, Jawad. "Network Coding in Uplink Cellular Systems". Thesis, KTH, Kommunikationssystem, CoS, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48936.

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Ever since its introduction, network coding has attracted a lot of interest from the research community. This interest is a result of two main factors: the simplicity of application of network coding and the possibility to apply it to a plethora of applications. Research in network coding started on wired networks for different types of traffic, mainly focusing on code design, content distribution and network security. However, researchers soon came to realize that the inherent properties of the wireless medium render it a fertile ground for the application of network coding. This has resulted in tremendous research efforts on wireless applications of network coding for wireless systems, both academically and industrially, with the majority of these works targeting bidirectional traffic scenarios. In this work, we focus on practical implementation issues for network coding when applied to uplink cellular traffic. We provide our own relaying scheme based on decode-and-forward relays and network coding with a specially designed method of decoding at the receiver. We complement this method with user grouping, relay selection diversity and time division among the transmitting nodes in order to achieve the gains promised by network coding in terms of throughput increase, while halving the power usage at the relay nodes. We show that these complements are necessary in order to translate the decrease in the number of transmissions offered by network coding into capacity gains; otherwise, random application of network coding would provide a worse performance compared to direct transmission or decode-and-forward relaying.

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Goran, Alan. "Reinforcement Learning for Uplink Power Control". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246043.

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Uplink power control is a resource management functionthat controls the signal’s transmit power from a userdevice, i.e. mobile phone, to a base-station tower. It isused to maximize the data-rates while reducing the generatedinterference.Reinforcement learning is a powerful learning techniquethat has the capability not only to teach an artificial agenthow to act, but also to create the possibility for the agentto learn through its own experiences by interacting with anenvironment.In this thesis we have applied reinforcement learningon uplink power control, enabling an intelligent softwareagent to dynamically adjust the user devices’ transmit powers.The agent learns to find suitable transmit power levelsfor the user devices by choosing a value for the closed-loopcorrection signal in uplink. The purpose is to investigatewhether or not reinforcement learning can improve the uplinkpower control in the new 5G communication system.The problem was formulated as a multi-armed banditat first, and then extended to a contextual bandit. We implementedthree different reinforcement learning algorithmsfor the agent to solve the problem. The performance ofthe agent using each of the three algorithms was evaluatedby comparing the performance of the uplink power controlwith and without the agent. With this approach we coulddiscover whether the agent is improving the performanceor not. From simulations, it was found out that the agentis in fact able to find a value for the correction signal thatimproves the data-rate, or throughput measured in Mbps,of the user devices average connections. However, it wasalso found that the agent does not have a significant contributionregarding the interference.
Uplink effektstyrning är en funktion för resurshanteringsom styr signalens sändningseffekt från en användaranordning,det vill säga från en mobiltelefon, till ett bas-stationstorn.Det används för att maximera datahastigheterna samtidigtsom den genererade interferensen reduceras.Förstärkningsinlärning är en kraftfull inlärningsteknik.Den har förmågan att inte bara lära en artificiell agent hurman agerar utan också skapa möjligheten för agenten attlära sig själv, genom att samspela med en miljö och samlaegna erfarenheter.I detta examensarbete har vi tillämpat förstärkningsinlärningpå uplink effektstyrning, vilket möjliggör för enintelligent mjukvaruagent att dynamiskt anpassa effektenpå sändningssignalerna hos användarens enheter. Agentenlär sig att hitta lämpliga sändningseffekter för enheternagenom att välja ett värde för korrigeringssignalen med slutenslinga i uplinken. Syftet är att undersöka huruvida förstärkningsinlärningkan förbättra uplink effektstyrningen idet nya 5G-kommunikationssystemet.Problemet formulerades som en Multi-Armed banditförst och utvidgades sedan till en Contextual bandit. Viimplementerade tre olika förstärkningsinlärning algoritmerför agenten att lösa problemet. Utförandet av agenten medanvändning av var och en av de tre algoritmerna utvärderadesgenom att jämföra prestanda för uplink effektstyrningenmed och utan agenten. Med detta tillvägagångssättkunde vi upptäcka om agenten förbättrar prestanda eller inte.Från våra simuleringar upptäcktes att agenten faktisktkan hitta ett värde för korrigeringssignalen som förbättrardatahastigheten, genomflödet mätt i Mbps, av genomsnittligaanslutningar för användarenheterna. Det har däremotockså visat sig att agenten inte har ett betydande bidragavseende interferensstörningarna.

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Più fonti

Libri sul tema "Uplink"

Yaacoub, Elias E., e Zaher Dawy. Resource Allocation in Uplink OFDMA Wireless Systems. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118189627.

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Kumar, Akshay, Ahmed Abdelhadi e T. Charles Clancy. Design and Implementation of Practical Schedulers for M2M Uplink Networks. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78081-8.

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Lundin, Erik Geijer. Uplink load in CDMA cellular radio systems: [controlling, characterizing, approximating]. Linko ping: Linko pings universitet, 2005.

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United States. National Aeronautics and Space Administration. Office of External Relations, a cura di. Uplink-downlink: A history of the Deep Space Network, 1957-1997. Washington, DC: National Aeronautics and Space Administration, Office of External Relations, 2001.

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D, Agrawal, e NASA Glenn Research Center, a cura di. A wideband satcom based avionics network with CDMA uplink and TDM downlink. Cleveland, Ohio: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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1949-, Simons Rainee, e Lewis Research Center, a cura di. A 1 W, 30-GHZ, CPW amplifier for ACTS small terminal uplink. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1992.

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E, McDonnell J. T., Hewlett-Packard Laboratories, Great Britain. Dept. of Trade and Industry. e Engineering and Physical Sciences Research Council (EPSRC), a cura di. Simulated BER performance of, and initial hardware results from, the uplink in the U.K. LINK-CDMA testbed. Palo Alto, CA: Hewlett-Packard Laboratories, Technical Publications Department, 1996.

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Scott, D. W. Portable color multimedia training systems based on monochrome laptop computers (CBT-in-a-briefcase), with spinoff implications for video uplink and downlink in spaceflight operations. [Marshall Space Flight Center, Ala.]: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1994.

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Clucas, Donald L. Upland. Charleston, SC: Arcadia Pub., 2008.

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Più fonti

Capitoli di libri sul tema "Uplink"

Weik, Martin H. "uplink". In Computer Science and Communications Dictionary, 1868. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_20526.

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Lunttila, Timo, Kari Hooli, Yuyu Yan e Antti Toskala. "Uplink MIMO". In LTE-Advanced, 75–85. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118399439.ch7.

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Andrews, Jeffrey G., Abhishek K. Gupta, Ahmad Alammouri e Harpreet S. Dhillon. "Uplink Analysis". In Synthesis Lectures on Learning, Networks, and Algorithms, 35–46. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-29743-4_3.

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Love, Robert, e Vijay Nangia. "Uplink Reference Signals". In LTE - The UMTS Long Term Evolution, 327–42. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978504.ch15.

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Baker, Matthew. "Uplink Transmission Procedures". In LTE - The UMTS Long Term Evolution, 407–20. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978504.ch18.

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Lindholm, Jari, Claudio Rosa, Hua Wang e Antti Toskala. "Uplink Carrier Aggregation". In LTE-Advanced, 50–62. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118399439.ch5.

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Perez, André. "Uplink Physical Signals". In LTE and LTE Advanced, 241–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145462.ch8.

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Perez, André. "Uplink Physical Channels". In LTE and LTE Advanced, 257–307. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145462.ch9.

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Wall, Stephen D., e Kenneth W. Ledbetter. "The Uplink Process". In Design of Mission Operations Systems for Scientific Remote Sensing, 78–110. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003069485-4.

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Love, Robert, e Vijay Nangia. "Uplink Physical Layer Design". In LTE - The UMTS Long Term Evolution, 315–26. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978504.ch14.

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Atti di convegni sul tema "Uplink"

Hert, Matthias, Gerald Reif, Sergio Marsella e Harald C. Gall. "UpLink". In the 7th International Conference. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/2063518.2063539.

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Johnson, C. "Calculating uplink Eb/No from uplink SIR measurements". In Fifth IEE International Conference on 3G Mobile Communication Technologies (3G 2004) The Premier Technical Conference for 3G and Beyond. IEE, 2004. http://dx.doi.org/10.1049/cp:20040676.

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Lunttila, Timo, Jari Lindholm, Kari Pajukoski, Esa Tiirola e Antti Toskala. "EUTRAN Uplink Performance". In 2007 2nd International Symposium on Wireless Pervasive Computing. IEEE, 2007. http://dx.doi.org/10.1109/iswpc.2007.342658.

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Li, Guo, e Xiao Zhang. "Semidefinite Relaxation Based Uplink Signal Reconstruction in Uplink Massive MIMO Systems". In ICC 2020 - 2020 IEEE International Conference on Communications (ICC). IEEE, 2020. http://dx.doi.org/10.1109/icc40277.2020.9148734.

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Grant, Stephen, Claes Tidestav, Xinyu Gu e Niklas Johansson. "Uplink CoMP for HSPA". In 2011 IEEE Vehicular Technology Conference (VTC 2011-Spring). IEEE, 2011. http://dx.doi.org/10.1109/vetecs.2011.5956383.

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Zhang, Zhang, e Liu Jinhua. "Uplink MIMO for HSPA". In ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364663.

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Wang, Yeou-Fang, Mitchell Schrock, Timothy J. Reeve, Kristine Nguyen e Benjamin D. Smith. "ULSGEN (Uplink Summary Generator)". In SpaceOps 2014 Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-1926.

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Martin, Patrick, Kathy Minear, Barry Geldzahler e Jason Soloff. "Large Reflector Uplink Arraying". In SpaceOps 2010 Conference: Delivering on the Dream (Hosted by NASA Marshall Space Flight Center and Organized by AIAA). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-2175.

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Trang, Cao Minh, Xin Huang e Cheng-Hsin Hsu. "Pushing uplink goodput of an asymmetric access network beyond its uplink bandwidth". In ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364265.

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Lahad, Bachir, Marc Ibrahim e Kinda Khawam. "A new uplink interference mitigation in HetNets using macro uplink subframe muting". In 2015 International Conference on Applied Research in Computer Science and Engineering (ICAR). IEEE, 2015. http://dx.doi.org/10.1109/arcse.2015.7338138.

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Rapporti di organizzazioni sul tema "Uplink"

Montgomery, Karl. A Characterization of OFDMA Uplink Activation for Industrial Applications. Gaithersburg, MD: National Institute of Standards and Technology, 2024. http://dx.doi.org/10.6028/nist.ir.8506.

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Flaten, James, Monique V. Hladun, Seth Frick, Alex Ngure, Hannah Weiher e John Jackson. Uplink, Downlink, and How NOT to Vent a High-Altitude Balloon. Ames (Iowa): Iowa State University. Library. Digital Press, gennaio 2014. http://dx.doi.org/10.31274/ahac.8156.

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List, Nancy, e Ryan Shoup. Incorporation of Uplink Channel State Information into an End-to-End Coded Satellite Communication System. Fort Belvoir, VA: Defense Technical Information Center, aprile 2011. http://dx.doi.org/10.21236/ada569700.

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Zhu, Changwen. Nonlinear Analysis and Digital Pre-Distortion of the SC-FDMA Signals in LTE Uplink System. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.2103.

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Swan, Megan, e Carrie Veety. Wupatki National Monument volcanic upland 2020 data summary: Southern Colorado Plateau Network integrated upland monitoring. National Park Service, giugno 2022. http://dx.doi.org/10.36967/2293459.

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Megonigal, Patrick, e Scott Pitz. Cryptic Methane Emissions from Upland Forest Ecosystems. Office of Scientific and Technical Information (OSTI), aprile 2016. http://dx.doi.org/10.2172/1248029.

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Cecile, M. P., e L. S. Lane. Geology of the Barn Uplift, northern Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/131844.

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Liu e Nixon. L52305 Probabilistic Analysis of Pipeline Uplift Resistance. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), giugno 2010. http://dx.doi.org/10.55274/r0000002.

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Abstract (sommario):

To investigate the feasibility of probabilistic analyses of the peak uplift resistance in frozen soils by varying parameters that are known to be important for the development of the uplift resistance under the upward movement of a pipe. A buried pipeline will be subjected to a variety of forces, both internal and external, including the interaction of the pipe with the surrounding soil. The soil-pipe interaction in permafrost regions have to account for the behavior of frozen and unfrozen soil, and transitions between the two as the pipeline traverses in a discontinuous permafrost zone. The variations in the properties and behavior of frozen soils are expected to be substantial in three dimensions of the Right-of-Way (ROW) and with time (seasonal fluctuations and changes with the history of pipeline operation). Given the uncertainties with frozen soil properties and the changes in behavior with time and location, a large variation in soil-pipe interaction characteristics can exist. The uplift resistance of a pipeline is one of these soil-pipe interactions that can be impacted by a variation in soil condition and state. A need was identified to outline the use of a probabilistic analysis of pipe uplift resistance in an attempt to capture the magnitude of these variations and uncertainties of frozen soil and the impact on the soil-pipe interaction. The probabilistic analysis allows the designer of a pipeline to consider a range of uplift resistance to a certain confidence level that would represent the likely values that a pipe may be subjected to. The work presented in this report is more focused on the methodology of the probabilistic approach, rather than the analysis itself for a specific design case, even though an example is provided for illustration purposes. A series of numerical simulations using Fast Lagrangian Analysis of Continua (FLAC) were completed varying one parameter with each run to develop a library of peak uplift resistances for a variety of different temperatures, soil properties and pipe parameters. The FLAC model was previously developed for PRC, a summary of this report is provided here to outline important parameters that were used to complete this analysis. The simulations were used to develop a correlation of peak uplift resistance as a function of soil tensile strain limit, modulus of deformation, and creep of frozen soils. Each of these parameters is dependent of the pipeline conditions such as temperature, displacement rate, and effective frozen cover depth. It is noted that the scope of the work was to develop a probabilistic method of estimating peak uplift resistance in frozen soils. Even though some sensitivity analysis were carried out, as outlined later in this report, to assess the impacts of the variable, detailed uncertainty analysis or risk assessment were not performed.

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Leclair, A. D., e G. G. Poirier. The Kapuskasing Uplift in the Kapuskasing area, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/126858.

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Boyle, M., e Elizabeth Rico. Terrestrial vegetation monitoring at Cumberland Island National Seashore: 2020 data summary. National Park Service, settembre 2022. http://dx.doi.org/10.36967/2294287.

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The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the nationwide Inventory and Monitoring Program of the National Park Service (NPS). The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and it is currently conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2020 marks the first year of conducting this monitoring effort at Cumberland Island National Seashore (CUIS). Fifty-six vegetation plots were established throughout the park from May through July. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Cumberland Island National Seashore in 2020. Data were stratified across three dominant broadly defined habitats within the park, including Coastal Plain Upland Open Woodlands, Maritime Open Upland Grasslands, and Maritime Upland Forests and Shrublands. Noteworthy findings include: 213 vascular plant taxa (species or lower) were observed across 56 vegetation plots, including 12 species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Upland Open Woodlands: longleaf + pond pine (Pinus palustris; P. serotina), redbay (Persea borbonia), saw palmetto (Serenoa repens), wax-myrtle (Morella cerifera), deerberry (Vaccinium stamineum), variable panicgrass (Dichanthelium commutatum), and hemlock rosette grass (Dichanthelium portoricense). Maritime Open Upland Grasslands: wax-myrtle, saw greenbrier (Smilax auriculata), sea oats (Uniola paniculata), and other forbs and graminoids. Maritime Upland Forests and Shrublands: live oak (Quercus virginiana), redbay, saw palmetto, muscadine (Muscadinia rotundifolia), and Spanish moss (Tillandsia usneoides) Two non-native species, Chinaberry (Melia azedarach) and bahiagrass (Paspalum notatum), categorized as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2018) were encountered in four different Maritime Upland Forest and Shrubland plots during this monitoring effort. Six vascular plant species listed as rare and tracked by the Georgia Department of Natural Resources (GADNR 2022) were observed in these monitoring plots, including the state listed “Rare” Florida swampprivet (Forestiera segregata var. segregata) and sandywoods sedge (Carex dasycarpa) and the “Unusual” green fly orchid (Epidendrum conopseum). Longleaf and pond pine were the most dominant species within the tree stratum of Coastal Plain Upland Open Woodland habitat types; live oak was the most dominant species of Maritime Upland Forest and Shrubland types. Saw palmetto and rusty staggerbush (Lyonia ferruginea) dominated the sapling stratum within Maritime Upland Forest and Shrubland habitat types. Of the 20 tree-sized redbay trees measured during this monitoring effort only three were living and these were observed with severely declining vigor, indicating the prevalence and recent historical impact of laurel wilt disease (LWD) across the island’s maritime forest ecosystems. There was an unexpectedly low abundance of sweet grass (Muhlenbergia sericea) and saltmeadow cordgrass (Spartina patens) within interdune swale plots of Maritime Open Upland habitats on the island, which could be a result of grazing activity by feral horses. Live oak is the dominant tree-sized species across...

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