Cognitive Radio Architecture: The Engineering Foundations of Radio XML

Chapter 6. RADIO-DOMAIN USE CASES

This chapter takes the next step in AACR by quantifying the value proposition. It also develops additional use cases along with the next level of detail in the technical issues of implementing the use cases.

RADIO USE-CASE METRICS

Today's radios function primarily as bit pipes, wireless paths for voice and data. Although data now includes short messages, pictures, video clips, and the Web, the radio moves these bits but does not quantify their QoI. And mobile radios typically are not as good at bit-pipe data delivery as their hardwired infrastructure counterparts. Since connectivity drives QoI, the value of mobility is high. These use cases therefore quantify the value of mobility and multiband multimode radio flexibility, where the radios themselves perceive the scene and process the bits to quantify <RF/> contribution to <User/> QoI.

QoS As a RF Use-Case Metric

Quality of service (QoS) is often emphasized as a limitation of wireless technologies. Of course, the bit error rate (BER), data rate (R_b), delay (dT), and delay jitter (σT) typically fall short of wireline performance by orders of magnitude as illustrated in Table 6-1. Mobility has its price.

Table 6.1. Wireless and Wireline QoS Parameters

QoS[a]	Dial Up	WLAN	Core Networks ISP and PSTN	Cellular	3 G
[a]
[b]
Rb (bps)	56 k	0.1–1.5 M	1–100 G	8 k	100 k
BER (10^)	−5	−6	−9	−3	−4
dT (ms)	100	10	1	30	10
σT (ms)	10	1	0.1	300[b]	100[b]
GoS (%)	99	99.9	99–99.999	70–90	80–95[b]
[a] Values are illustrative and not intended to be pejorative.