device communication and control

... devices  Block drivers, which control block devices  Network drivers, which control network devices  Pseudo -device drivers, which control pseudo-devices Character devices provide either a character-stream-oriented ... that controls or “drives” a device (or sometimes numerous devices) In UNIX and pre-4.0 FreeBSD, there are four different types of device drivers:  Character drivers, which control character devices ... Device Communication and Control Teaches you how to communicate with and control your device drivers from user space Chapter 4: Thread Synchronization Discusses the problems and solutions associated...

Ngày tải lên: 29/05/2014, 23:56

Ngày tải lên: 03/06/2014, 02:16

... initial bandwidth, UGS, rtPS, nrtPS and BE, based on the requested bandwidth of UGS, the required minimum bandwidth of rtPS and nrtPS and the queue length of BE service respectively If remaining bandwidth ... Admission Control (CAC) and an Approach with Guaranteed Maximum Delay for Fixed WiMAX Networks 59 Eden Ricardo Dosciatti, Walter Godoy Junior and Augusto Foronda Chapter Scheduling Algorithm and Bandwidth ... overall bandwidth allocation The EDF scheduling algorithm is used for SSs of ertPS and rtPS classes The WFQ algorithm is used for SSs of nrtPS class and FIFO is used for SSs of BE class The bandwidth...

Ngày tải lên: 21/06/2014, 05:20

... different and sometimes conflicting requirements UGS services must always have their delay and bandwidth commitment met, so simply reserving enough bandwidth for those services and controlling ... Standard for Local and Metropolitan Area Networks—Part 16: Air Interface for Fixed Broadband Wireless Access Systems—Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and ... connection and then sent to BS, and BS sorts the SC of all the connections and assigns bandwidth according to the descending order of SC SC is derived according to the buffer occupancy and waiting...

Ngày tải lên: 21/06/2014, 05:20

... al (2011) • The WiMAX standard provides the necessary signalling channels (such as the CSI feedback messages (CQICH, REP-REQ and REP-RSP) and the control messages DL-MAP and DCD) that can be used ... Selected Areas in Communications 21(2): 171–178 Kivanc, D., Li, G & Liu, H (2003) Computationally efficient bandwidth allocation and power control for OFDMA, IEEE Transactions on Wireless Communications ... k GNR of user k in bands I, P A resp sharing factors of user k in bands I, Pc resp power allocated to user k in bands I, P A resp power transmitted by base station c in bands I, P A resp total...

Ngày tải lên: 21/06/2014, 05:20

... interface for fixed and mobile broadband wireless access systems amendment 2: Physical and medium access control layers for combined fixed and mobile operation in licensed bands and corrigendum 1, ... Ieee standard for information technology-telecommunications and information exchange between systems-local and metropolitan networks-specific requirements-part ii: Wireless lan medium access control ... during vertical handoff., IEEE Network 20: 24 – 31 IEEE-802.11 (2005) Iso/iec standard for information technology - telecommunications and information exchange between systems - local and metropolitan...

Ngày tải lên: 21/06/2014, 05:20

... Symposium on Computer Modeling and Simulation, 2008 EMS ’08, pp 518-523, sep 2008 Mathias Bohge and James Gross and Adam Wolisz and Tkn Group and Tu Berlin and Michael Meyer and Ericsson Gmbh (2007) ... Mukul, R and Singh, P and Jayaram, D and Das, D and Sreenivasulu, N and Vinay, K & Ramamoorthy, A (2006) An adaptive bandwidth request mechanism for QoS enhancement in WiMax real time communication, ... Mobile Operation in Licensed Bands Jeffrey G et al (2007) Fundamentals of WiMAX Understanding Broadband Wireless Networking, Prentice Hall Communications Engineering and Emerging Technologies Series...

Ngày tải lên: 21/06/2014, 05:20

... Mobility management and mobile IP home agent functionality; Connectivity, infrastructure and policy control; Interoperability and billing solution; AAA proxy for devices, clients and services such ... with and without a handover policy The SSs with high speed did more handovers than others, and thus, more time should be spent without connection during the handover In other SSs, the handover ... Interface for Fixed and Mobile Broadband Wireless Access Systems Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands M Sollner, C Gorg,...

Ngày tải lên: 21/06/2014, 05:20

... Probabilities for DV and CTC Map1 Fig MCS changes for DV and CTC Map1 110 140 Evaluation of QoS and QoE in Mobile WIMAX – Systematic Approach Fig System throughput for DV and CTC – Map1 Fig Bandwidth utilization ... DV and CTC – Map 231 232 Quality of Service and Resource Allocation in WiMAX Fig Blocking probabilities for DV and CTC – Map1 Fig 10 System throughput for DV and CTC – Map2 Evaluation of QoS and ... Admission Control for IEEE 02.16e-based Mobile BWA Networks Consumer Communications and Networking Conference, 2007 CCNC 2007 4th IEEE [13] Xin Guo, Wenchao Ma, Zihua Guo, and Zifeng Hou , Dynamic Bandwidth...

Ngày tải lên: 21/06/2014, 05:20

... design and explicit structure is left up to vendors and research bodies for further development and implementation (J G Andrews, 2007) In the rest of this paper we will explore these areas and apply ... scheduling policy and design are beyond of WiMAX standard scope and equipment vendors are encouraged for proprietary solutions, complied with general standard specifications ( Andrews, (2007) Each ... cameras strive for bandwidth-consuming and delay-sensitive QoS demands, whereas timely bandwidth fair allocation is of primary importance MAC QoS support of WiMAX enables to handle multiple video...

Ngày tải lên: 21/06/2014, 05:20

... Personal, Indoor and Mobile Radio Communications (PIMRC 2010) , 2010, Istanbul J G Andrews, (2007) “Fundamentals of WiMAX: Understanding Broadband Wireless Networking”, in Prentice Hall Communications ... 2005; Andrews et al., 2007; Nuaymi, 2007), as it essentially justifies the increased bandwidth compared to 3G systems, which bandwidth capacity will be further expanded in part ‘m’ of the standard ... synchronize 276 Quality of Service and Resource Allocation in WiMAX WiMAX and IP handoff management (Chen & Hsieh, 2007) and in that way reduce the number of control messages For further general...

Ngày tải lên: 21/06/2014, 05:20

... are routed and given priority due to the service class name associated with them and the scheduling type, which handles the bandwidth request/grant mechanism The silver service class and the Real-time ... topologies The RSU and car communication are the major communication nodes in VANET Our RSU is a simplified WiMAX BS Each car is equipped with proper communication tools to enable car to car and car to ... of 250:1) and encrypted video images to the control centre via a car-to-car radio system The receiver decodes and decompresses the received video frames and plays the image at the control centre...

Ngày tải lên: 21/06/2014, 05:20

... central controller Henceforth, the term C-UWB nodes and central controller are used to differentiate between transmitter and receiver The interactions between C-UWB transmitter and the central controller ... arrival Queue status and time slot allocation PRR based resource allocation and packet scheduling SNR and sensing time Adaptive modulation and channel coding PHY UWB channel shadowing and interference ... modulation and coding scheme (MCS), Ns is the number of subcarriers in a subband, and SNRi is the ratio of signal to interference and noise on the ith subcarrier Knowing the target PRR (PRRT ) and the...

Ngày tải lên: 21/06/2014, 11:20

... given by hsr = hsd = (2) where xs,t and xr,t are the training symbols sent by the source and relay, respectively, and xs and xr are the corresponding source and relay data vectors The pilot symbols ... equations and henceforth, wsr ∼ CN (0, 1), wsd ∼ CN (0, 1), and wrd ∼ CN (0, 1) denote independent, standard Gaussian random variables The above formulation applies to both overlapped and nonoverlapped ... δs,1 subopt subopt and δs,2 , respectively Note that expressions for δs,1 and subopt δs,2 are exactly the same as that in (37) with Pr and α subopt replaced by Ps and (1 − α), and σrd replaced...

Ngày tải lên: 21/06/2014, 23:20

... B, and C are positive quantities that depend on the constants a, b, and c and the variables r and x Equation (C.2) can be written as A −5 (C.4) (B.8) where a, b, and c are positive constants and ... Sankaranarayanan, G Kramer, and N B Mandayam, “Capacity theorems for the multiple-access relay channels,” in Proceedings of the 42nd Annual Allerton Conference on Communication, Control and Computing, Monticello, ... Conference on Sensor and Ad Hoc Communications and Networks (SECON ’04), pp 191–199, Santa Clara, Calif, USA, October 2004 [10] K Seddik, A K Sadek, W Su, and K J R Liu, “Outage analysis and optimal power...

Ngày tải lên: 22/06/2014, 01:20

... initial bandwidth, UGS, rtPS, nrtPS and BE, based on the requested bandwidth of UGS, the required minimum bandwidth of rtPS and nrtPS and the queue length of BE service respectively If remaining bandwidth ... Broadband Wireless Access Systems October, 2004 IEEE Standard 802.16e-2005,Part16 IEEE Standard for Local and Metropolitan Area NetworksPart 16: Air Interface for Fixed and Mobile Broadband Wireless ... Admission Control (CAC) and an Approach with Guaranteed Maximum Delay for Fixed WiMAX Networks 59 Eden Ricardo Dosciatti, Walter Godoy Junior and Augusto Foronda Chapter Scheduling Algorithm and Bandwidth...

Ngày tải lên: 27/06/2014, 01:20

... Netherlands; New Zealand; Nicaragua; Niger; Norway; Pakistan; Panama; Paraguay; Peru; Philippines; Portugal; Rwanda; Senegal; Spain; Sri Lanka; Sweden; Switzerland; Thailand; Togo; Trinidad and ... production and trade 10 where ct0 and hct0 are endowments of physical and human capital of country c, ^ kt are the corresponding revealed factor intensities of product k, and ^ kt0 and h all in ... factor intensities and the country factor endowments, with mean and standard deviation This assures equal weights of physical and human capital in the overall distance, as and h are measured...

Ngày tải lên: 21/04/2016, 13:19

... amplify -and- forward (AF) and decode -and- forward (DF) modes, and study power control scheme based on a two-stage game But, the studies in [3,6] not take subcarrier allocation into account, and in ... combination of merits of centralized and distributed schemes, and can effectively achieve the subcarrier and power Hou et al EURASIP Journal on Wireless Communications and Networking 2011, 2011:169 ... channel coefficients between base station and the mth user, the kth relay and the mth user, the base station and the kth relay are denoted by hn , d,m hn and hn , respectively The notation a means...

Ngày tải lên: 20/06/2014, 22:20

... 400, and 480 Mbps The spectrum is divided into 14 bands with each bandwidth of 528 MHz The consecutive three bands form one band group except the last two bands that form the last fifth group And ... WiMedia PHY and MAC ECMA specified WiMedia PHY and MAC, called ISO (International Organization for Standardization)-based ECMA-368 [2] The standard uses the spectrum between 3.1 and 10.6 GHz and supports ... in band group Figure An illustration of a hopping pattern of MB-OFDM in band group that uses one of three bands at a given time Chang and Bahk EURASIP Journal on Wireless Communications and...

Ngày tải lên: 20/06/2014, 22:20

... solutions The proposed heuristics start with a random initial deviceto-segments allocation set by: (i) InitRandomly Random initial order of devices, and randomly set segment borders (code not shown) ... Allocation Swapping Devices Randomly Algorithm Swap-Randomly picks two devices at random and swaps their places on the bus Observe that swapping does not change the number of devices allocated ... bus with ns = segments and n = devices, as in Figure For example, a data transfer between D4 and D6 reserves the segment only On the other hand, a transfer between D2 and D8 reserves all the...

Ngày tải lên: 21/06/2014, 20:20