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lclclclc88

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IX. PERFORMANCREE SULTS
Both performance measures discussed in this paper, namely data-packet delay and voice-call blocking probability, have been evaluated computationally. In this section we present the
results of our evaluation of both fixed- and movable-boundary versions of the WIMA protocol. All of the results are for M = MV = 10 and L = R = 12. Our earlier studies of the IFF0 protocols have shown that performance is quite insensitive to the number of terminals for M greater than about 5 [3], and this behavior has also been observed for the WIMA protocol; thus the results for M = 10 are representative of higher values as well. The number of iterations required for
convergence ranged from 2 at extremely low throughput rates to more than 2000 at extremely high throughput rates. Fig. 6 shows the expected data-packet system time (which is normalized with respect to the frame length L) as a function of data throughput for the fixed-boundary WIMA scheme for values of V, ranging from 0 to 6. Note that data throughput is defined to be the expected number of data packets successfully delivered by the system per time slot,where the average is taken over all L slots in the frame, including the status slot and those that are used for voice transmission. Recall that this performance index is independent of all voice-call parameters except V, in fixed-boundary systems. Note that the curve for V, = 0 is actually the curve for PR-NIFFL, which is data-only system. The maximum achievable data throughput under the WIMA schemes is (L - 1 - Vmax)/L, and we may define the "utilization" to be the data throughput normalized by this quantity. As the utilization approaches 1, which occurs at different values of data throughput for different values of V, the expected delay increases to co. For all values of V, results were obtained for utilization values of at least 0.98 (for which a 700 x 700 transition matrix was used), thereby demonstrating the ability of our model to evaluate heavily-loaded systems.
Fig. 7 shows the effect of varying pv (and hence the expected length of voice calls) over a wide range for the movable-boundary scheme with V,,, = 6, while Xv is kept fixed at 0.01. For small values of pv, the system is heavily loaded, and performance approaches that of the fixed-boundary scheme. As pv increases, the average length of voice calls decreases, resulting in a decrease in the voice-call load and hence an increase in the number of slots available for data
traffic. Thus the system is able to support higher levels of data traffic.
Fig. 8 shows the voice-call blocking probability as a function of Vmax for Xv = 0.01 and several values of pv. Clearly,increasing Vmax results in lower blocking probability because more of the channel resource is available for the voice calls. Also, since large values of pv correspond to short voice calls,increasing pv results in lower channel utilization and hence in lower blocking probability.

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lclclclc88: 金幣+18, 翻譯EPI+1, 稍有誤差！灰常感謝��！ 2012-04-11 23:06:53
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供參考：
本文討論了兩項(xiàng)工作特性測(cè)定，即通過計(jì)算對(duì)數(shù)據(jù)信息包延遲和語音呼叫閉鎖概率進(jìn)行了評(píng)價(jià)。這一節(jié)給出WIMA協(xié)議中固定邊界和可調(diào)邊界形式的評(píng)價(jià)結(jié)果，結(jié)果均為M = MV = 10、L = R = 12。早期IFF0協(xié)議的研究顯示，當(dāng)M大于5時(shí)，工作特性對(duì)終端數(shù)值不敏感，對(duì)WIMA協(xié)議也觀察了這種特性，當(dāng)M=10時(shí)的結(jié)果同樣是具有代表性的高值。收斂所需的迭代次數(shù)范圍從最低輸送速度2到最高輸送速度2000。圖6所示為預(yù)期數(shù)據(jù)包系統(tǒng)時(shí)間（關(guān)于幀長(zhǎng)L歸一化處理）為輸送給固定邊界WIMA方案數(shù)據(jù)的函數(shù)，其中V值范圍從0到6。注意輸送數(shù)據(jù)定義為每個(gè)時(shí)隙系統(tǒng)成功傳送的數(shù)據(jù)包期望值，這里時(shí)隙平均值被幀中全部L槽接收，包括狀態(tài)槽和用于語音傳送的槽。在固定邊界系統(tǒng)中，該性能指數(shù)與除V外的所有語音呼叫參數(shù)無關(guān)。注意V=0時(shí)的曲線實(shí)際上僅為數(shù)據(jù)系統(tǒng)PR-NIFFL的曲線。WIMA模式下最大可輸送數(shù)據(jù)為L(zhǎng)，可定義數(shù)據(jù)被該數(shù)值歸一化的“利用”，當(dāng)“利用”接近1時(shí)，期望的延遲增加至結(jié)束工作，對(duì)于不同V值這種情況出現(xiàn)在不同的輸送數(shù)據(jù)值。對(duì)于全部V值，利用值至少0.98（采用700 x 700傳遞矩陣）得到的結(jié)果論證了我們模型評(píng)估重載系統(tǒng)的能力。圖7所示為V=6而XV保持固定值0.01時(shí)，在可調(diào)邊界模式的整個(gè)廣域內(nèi)改變PV（因此語音呼叫預(yù)期長(zhǎng)度變化）的影響。對(duì)于小的PV值，系統(tǒng)重載，工作特性接近固定邊界模式。隨著PV增加，語音呼叫平均長(zhǎng)度減小，導(dǎo)致語音呼叫輸入降低，因此增加可獲得的用于數(shù)據(jù)傳送槽的數(shù)量，這樣系統(tǒng)能支持更高水平的數(shù)據(jù)傳遞。圖8所示Xv = 0.01而幾個(gè)PV值時(shí)，語音呼叫閉鎖概率為最大V值的函數(shù)，顯然V最大值增加導(dǎo)致閉鎖概率降低，因?yàn)楦嗟男诺蕾Y源可用于語音呼叫。而且，由于大PV值與短語音呼叫對(duì)應(yīng)，增加PV導(dǎo)致信道利用降低因此閉鎖概率降低。

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2樓2012-04-11 21:32:06