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lclclclc88金虫 (小有名气)
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求助英语文献翻译2 关于无线通信的
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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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yuanbing0000
至尊木虫 (小有名气)
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lclclclc88: 金币+18, 翻译EPI+1, 稍有误差！ 灰常感谢！！ 2012-04-11 23:06:53
Mally89: 金币+2, 感谢应助！~欢迎常来！~好运！~\(^o^)/~ 2012-04-14 13:02:40
lclclclc88: 金币+18, 翻译EPI+1, 稍有误差！ 灰常感谢！！ 2012-04-11 23:06:53
Mally89: 金币+2, 感谢应助！~欢迎常来！~好运！~\(^o^)/~ 2012-04-14 13:02:40
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供参考： 本文讨论了两项工作特性测定，即通过计算对数据信息包延迟和语音呼叫闭锁概率进行了评价。这一节给出WIMA协议中固定边界和可调边界形式的评价结果，结果均为M = MV = 10、L = R = 12。早期IFF0协议的研究显示，当M大于5时，工作特性对终端数值不敏感，对WIMA协议也观察了这种特性，当M=10时的结果同样是具有代表性的高值。收敛所需的迭代次数范围从最低输送速度2到最高输送速度2000。图6所示为预期数据包系统时间（关于帧长L归一化处理）为输送给固定边界WIMA方案数据的函数，其中V值范围从0到6。注意输送数据定义为每个时隙系统成功传送的数据包期望值，这里时隙平均值被帧中全部L槽接收，包括状态槽和用于语音传送的槽。在固定边界系统中，该性能指数与除V外的所有语音呼叫参数无关。注意V=0时的曲线实际上仅为数据系统PR-NIFFL的曲线。WIMA模式下最大可输送数据为L，可定义数据被该数值归一化的“利用”，当“利用”接近1时，期望的延迟增加至结束工作，对于不同V值这种情况出现在不同的输送数据值。对于全部V值，利用值至少0.98（采用700 x 700传递矩阵）得到的结果论证了我们模型评估重载系统的能力。图7所示为V=6而XV保持固定值0.01时，在可调边界模式的整个广域内改变PV（因此语音呼叫预期长度变化）的影响。对于小的PV值，系统重载，工作特性接近固定边界模式。随着PV增加，语音呼叫平均长度减小，导致语音呼叫输入降低，因此增加可获得的用于数据传送槽的数量，这样系统能支持更高水平的数据传递。图8所示Xv = 0.01而几个PV值时，语音呼叫闭锁概率为最大V值的函数，显然V最大值增加导致闭锁概率降低，因为更多的信道资源可用于语音呼叫。而且，由于大PV值与短语音呼叫对应，增加PV导致信道利用降低因此闭锁概率降低。 |
2楼2012-04-11 21:32:06