Time allocation scheme in IEEE 802.15.3 TDMA mechanism

In network with a shared channel in TDMA mechanism, it is a core issue to effectively allocate channel time to provide service guarantees for flows with QoS requirements. This paper proposes a simple and efficient time allocation scheme called MES-ESRPT (MCTA at the End of Superframe-Enhanced Shortest Remaining Processing Time) for delay-sensitive VBR traffic in accordance with IEEE 802.15.3 standard. In this algorithm, PNC (piconet coordinator) allocates one MCTA (Management Channel Time Allocation) for each stream which is the process of communication at the end of superframe. During the MCTA period, each transmitter should report current fragments number of the first MSDU (MAC Service Data Unit) and the fragments number of the remainder MSDUs to PNC. In the next superframe, PNC firstly allocates part CTAs (Channel Time Allocation) for each stream based on the remainder fragments number of the first MSDU by SRPT rule, then allocates remainder CTAs for each stream based on all fragments number of remainder MSDUs by the same SRPT rule. Simulation results showed that our proposed MES-ESRPT method achieves significantly better performance in QoS for multimedia streams compared to the existing schemes.     

猜一猜“what”(英文)

常读一些英语谜语,可以在潜意识中提高自己的语言水平。请猜一猜下面谜语中what的含义。 1.What’s too much for one,just right for two,but nothingat all for three?     

数词趣语

数字在人们的生活中可以说无处不在, 在语言表达上同样是无孔不入。首先从一说起。英美人似乎很自大,总是把“我”大写成I,这个大写的I也可说成number one(或No. 1),即自我。人有四肢,如果四肢着地爬行就是“go on all fours”。有时候事情会乱得一团糟, 于是英语中就有“at sixes and sevens”。人一喝醉,丑态百出,这情景单用一个drunk是难以形容的,于是用语中就有了have one over the eight(酩酊大醉)的说法,这似乎让人看到八个醉鬼醉倒在一张饭桌底下的情景。下面再举一些例子:     

谚语集锦

1.Life exists in motion.生命在于运动 (英国谚语) 2.The ground-work of all happiness is health.健康是一切幸福的基础(英国谚语) 3.Better be afree bird than a captive king.宁做自由的小鸟,不做被囚的国王 (英国谚语) 4.Too much liberty spoils all.     

学习并快乐着

我们每人都有自己的个性和特长,只要努力,都应当像花朵一样能够自由开放,不当number one(第一)没有关系,只要做only one(唯一)就行。     

How To Use An ATM (高二适用)

Pat Brown went to her bank to ask for an ATM(自动取款机)card.Afew weeks later,the bank posted her a card and a four number personalidentification number(PIN).Her PIN is 1234. As Pat was getting ready for bed one night,she remembered that shehad only $2 in her bag.The next day she had to give $10 for a lunch for     

语法填空

(1)(湖南省五市十校2013届高三第一次联合检测)Job hunting has always been a headache for college graduates.Though many graduates are employed right after graduation,some are 1.Most serious of all,some still have no idea2 to go working even a long time after graduation.The reasons 3 this phenomenon are various.On the one hand,a few years ago colleges and universities enrolled so many students in popular majors,such as economy,finance and so on4 the number of graduates is greater than the need in the market.On the other hand,most     

Need a Map ?

It was my first day at school.I felt nervous and scared.I went to all my classes with1friends.I felt like no one2.I listened3to all the lessons and waited for lunch4at one.     

无孔不入的数字

数字在人们的生活中可以说无处不在,在语言表达上同样是无孔不入。首先从一说起。英美人似乎很自大,总是把“我”大写成I,这个大写的I也可说成number one(或No.1), 即自我。汉语中有句话叫“同行是冤家”,英语中相似的说法是“Two of a trade never agree.”人有四肢,如果四肢着地爬行就是“go on all fours”。有时候事情会乱得一团糟,于是英语中就有“at sixes and sevens”。人一喝     

谜语(英文)

1.What is smaller than an insect's mouth? 2.What season is the most dangerous one? 3.What's too much forme,just right for two,but nothing at all for three? 4.On what day of a year do soldiers start wars in history? 5.How many feetare in a yard? 6.Whatperson tries to make others smile most of the time? 7.From what number can one take half and leave nothing? 8.What has hands but no feet,a face but no eyes,tells but does not talk? 9.How many months have 28 days? 10.Which horses have six legs?K…     

永远的朋友(英文)

You've tasted (尝,体会) bitter defeat (失败的痛苦) and the sweet success(成功的甜蜜)You want it all and you settle for nothing lessYou've tried harder than the restYou've become(成为) one of the bestThis is the time you'll remember for all your lifeForever friends     

足球就是生命(英文)

Football is,I do think,the most favoritegame in England.One has only to go to one of theimportant1to see this.Rich and poor,youngand old,one can see them all there2for oneside or the3.To a stranger(陌生人),one ofthe most surprising things about football i…     

坏兆头在日本

In Japan there are certain things one does not do because they are thought to cause bad luck. Hen are they going: The number FOUR The number FOUR is considered inauspicious because it is pronounced the same as the word for death (shi).Therefore,one should not make presents that consist of four pieces,etc.In some hotels and hospitals the room number four is skipped.     

2001年全国中考完成对话试题精选（一）

情景对话: (一)根据对话内容,选择方框中适当的句子,使对话完整、正确。A:What can I do for you,Sir?B:(1)——A:For yourself?.These are all for young people.(2)——B:I like the blue one.A:(3)——B:Thank you.(4)     

友谊

Friends play an important part in our lives,and although we maytake friendship for granted , we often dont clearly understand how wemake friends. While we get on well with a number of people,we areusually friends with only a very few, for example , the average amongstudents is about 6 per person.In all the cases of friendlyrelationships,two people like one another and enjoy being together,butbeyond that, the degree of intimacy between them and the reasons fortheir shared interests vary enormou…     

不定冠词a(n)和数词one的用法浅谈

在英语学习的过程中,a(n)和one都可表示“一”的概念,都可以和单数可数名词搭配使用,因此,每当学生在碰到这两个词的时候,往往就不知该用哪一个好,所以本文拟就这方面的问题作一些总结和归纳。 一、在一般的情况下,a(n)和one可以通用。 例:①.I Saw a(one) dog, a(one) pig and two horses in front of the house. ②.In a(one) word,you won't be late for class again.     

完型填空精练

From age eight to eleven,I attended alocal school in Bath,England.It was a(n)1school composed of four classes withabout25children in each class according to2.For the most part,one teacher was re-sponsible for teaching all subjects to the chil-dren in thei…     

谚语集锦

1．Ask much,know much．多问多知道。 2．All for one,one for all．人人为我,我为人人。 3．There is no end to learn．学无止境。     

Solvability of the nonlinear Airy equation on a torus

1. Introduction Consider the problem (P) below 2 i(), for (,),txxxuuuuufxxtT++++=未a where the initial condition is 0(0,)()uxux=. Herein 0u and 2()fLT are square integrable complex functions on T; T is the 1-dimensional torus, +Ris the set of positive numbers, and a a real positive number. This type of equation was first introduced in the study of optical fibers [1]. Y. Martel [2] proved the well-posedness for the case of whole space R(the set of all real numbers) with a = …     

英语的演变(英文)

World Language Once upon a time, people dreamed of a universal language so that all the peoples of the world could understand each other. Now, for the first time in human history, and quite by accident, it seems there is one——English. There are over 50 countries where it is the official language and the number of people who speak it as their mother tongue is somewhere between 375 and 400 million. Another