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% Table generated by Excel2LaTeX from sheet 'Sheet1'

documentclass{article}

usepackage{tabularx,booktabs}

usepackage{multirow}



begin{document}



begin{table}[htbp]

  centering

  caption{Add caption}

    begin{tabular}{|p{3em}|p{5em}|p{4em}|p{5em}|p{5em}|p{4em}|p{4em}|p{4em}|}

    hline

    multirow{2}{*}{textbf{Mobility Model}}

            &   multicolumn{7}{c}{textbf{Parameter}}  \

            cmidrule{2-8}& textbf{Basic Description} & textbf{Adaptability for AANETs} & textbf{Support to higher node mobility and Frequent topology updates} & textbf{Safety parameters} & textbf{Mechanical and aerodynamic constraint} & textbf{Degree of Randomness} & textbf{Applications} \

    hline



    end{tabular}%

  label{tab:addlabel}%

end{table}%

end{document}

One of the issues you're encountering is that pdfLaTeX never hyphenates the first word of a paragraph. The contents of a cell in a p column form a paragraph, in the TeX-specific sense of the term.

The way to enable hyphenation of the first words in some of the cells -- "Adaptability" and "Mechanical" are prime candidates -- is to slip in a somewhat artificial-looking hspace{0pt}. In the code below, this is done by setting up new column type, called P, which is a p column that sets its contents ragged-right rather than fully justified, while still allowing hyphenation, even of the first word in the cell.

documentclass{article}

usepackage[letterpaper,margin=1in]{geometry} % set suitable page parameters

usepackage[english]{babel}



usepackage{array,ragged2e}

newcolumntype{P}[1]{>{RaggedRightarraybackslashhspace{0pt}}p{#1}}



begin{document}



begin{table}[htbp]

centering

caption{Add caption}

label{tab:addlabel}

begin{tabular}{|P{4.5em}|P{5em}|P{5em}|P{5em}|%

                 P{5em}  |P{4em}|P{4em}|P{4em}|}

hline

textbf{Mobility Model}

& multicolumn{7}{c|}{textbf{Parameter}}  \

cline{2-8}

& textbf{Basic Description} 

& textbf{Adaptability for AANETs} 

& textbf{Support to higher node mobility and Frequent topology updates} 

& textbf{Safety parameters} 

& textbf{Mechanical and aerodynamic constraint} 

& textbf{Degree of Randomness} 

& textbf{Applications} \

hline

end{tabular}

end{table}

end{document}

Here are two (three) more possible solutions. In all of them I have used the tabularx package to make the tables as wide as the textwidth. I have also replaced the cmidrule comand by cline as booktabs' rules don't cooperate well with vertical lines. For an alternative, see the third example.

In the first one, I have used abbreviations for the column headers that are explained below the table:

documentclass{article}

usepackage{tabularx}

usepackage{multirow}



begin{document}



begin{table}[htbp]

  centering

  caption{Add caption}

    begin{tabularx}{textwidth}{|p{1.5cm}|X|X|X|X|X|X|X|}

    cline{1-8}

    textbf{Mobility Model} &   multicolumn{7}{c|}{textbf{Parameter}}  \

            cline{2-8}

            & textbf{BD} & textbf{AA} & textbf{SF} & textbf{SP} & textbf{MC} & textbf{DR} & textbf{AP} \

    cline{1-8}

multicolumn{8}{p{textwidth}}{small BD: Basic Description, AA: Adaptability for AANETs, SF: Support to higher node mobility and Frequent topology updates, SP: Safety parameters, MC: Mechanical and aerodynamic constraint, DR: Degree of Randomness, AP: Applications}

    end{tabularx}%

  label{tab:addlabel}%

end{table}%

end{document}

In the second example, I have used sidewaystable from the rotating package in order to rotate the table:

documentclass{article}

usepackage{tabularx}

usepackage{multirow}

usepackage{rotating}

usepackage{ragged2e}

newcolumntype{R}{>{RaggedRightletnewline\arraybackslashhspace{0pt}}X}



begin{document}



begin{sidewaystable}[htbp]

  centering

  caption{Add caption}

    begin{tabularx}{textwidth}{|R|R|R|R|R|R|R|R|}

    hline

    textbf{Mobility  Model} &   multicolumn{7}{c|}{textbf{Parameter}}  \

            cline{2-8}

            & textbf{Basic Description} 

            & textbf{Adaptability for AANETs} 

            & textbf{Support to higher node mobility and Frequent topology updates} 

            & textbf{Safety parameters} 

            & textbf{Mechanical and aerodynamic constraint} 

            & textbf{Degree of Randomness} & textbf{Applications} \

    hline



    end{tabularx}%

  label{tab:addlabel}%

end{sidewaystable}%

end{document}

In this last example I have removed all vertical lines and replaced the horizontal lines by the rules from booktabs. I have also removed the bold from the column headers as it might distract:

documentclass{article}

usepackage{tabularx}

usepackage{multirow}

usepackage{booktabs}



begin{document}



begin{table}[htbp]

  centering

  caption{Add caption}

    begin{tabularx}{textwidth}{p{1.5cm}XXXXXXX}

    toprule

   Mobility Model &   multicolumn{7}{c}{Parameter}  \

    cmidrule{2-8}

            & BD & AA & SF & SP & MC & DR & AP \

    bottomrule

multicolumn{8}{p{textwidth}}{small BD: Basic Description, AA: Adaptability for AANETs, SF: Support to higher node mobility and Frequent topology updates, SP: Safety parameters, MC: Mechanical and aerodynamic constraint, DR: Degree of Randomness, AP: Applications}

    end{tabularx}%

  label{tab:addlabel}%

end{table}%

end{document}

(adding this answer separately from the first, as the solution method is quite different)

Your table doesn't seem to be set up to fully span the available width of the text block. If this were my table, I would switch to a tabularx environment (with overall width set to textwidth) and drop the unnecessary bold-facing of the contents of the header cells. The seven data columns employ a column type called C, which is simply a modified, centered version of the X column type. A feature is that it's straightforward to allow for varying column widths; the only constraint is that the 7 C arguments must sum to 7, which is the number of columns of this type. A principal formatting goal that guided the width choices was to have no more than four rows in any header cell.

documentclass{article}

usepackage[letterpaper,margin=1in]{geometry} % set suitable page parameters

usepackage[english]{babel}

usepackage{tabularx,ragged2e,booktabs}

newcolumntype{L}{>{RaggedRightarraybackslashhspace{0pt}}X}

newcolumntype{C}[1]{>{Centeringarraybackslashhspace{0pt}hsize=#1hsize}X}

usepackage[skip=0.333baselineskip]{caption} % optional



newcommandmytab[1]{smash{%

   begin{tabular}[t]{@{}l@{}} #1 end{tabular}}}



begin{document}



begin{table}[htbp]

setlengthtabcolsep{3pt} % default value: 6pt

caption{Add caption}

label{tab:addlabel}

small

begin{tabularx}{textwidth}{@{} L 

    C{0.8}C{1}C{1.5}C{0.8}C{1}C{0.9}C{1} @{}}  % 7 args sum to 7

toprule

mytab{Mobility\Model} & multicolumn{7}{c@{}}{Parameters}  \

cmidrule(l){2-8}

& Basic Description 

& Adaptability for AANETs 

& Support for higher node mobility and frequent topology updates

& Safety parameters

& Mechanical and aero-dynamic constraint

& Degree of randomness

& Applications \

midrule

blabla & blabla & blabla & blabla & blabla & blabla & blabla & blabla \

blabla & blabla & blabla & blabla & blabla & blabla & blabla & blabla \

blabla & blabla & blabla & blabla & blabla & blabla & blabla & blabla \

bottomrule

end{tabularx}

end{table}



end{document}