This document is a Draft Permanent Document of IEEE Working Group 802.20. Permanent Documents (PD) are used in facilitating the work of the WG and contain information that provides guidance for the development of 802.20 standards. This document is work in progress and is subject to change.
1 Overview 3
2 Link level Modeling 3
3 System Level Modeling 3
4 Channel Modeling 7
5 Output Metrics 7
6 Payload Based Evaluation 7
7 Fairness Criteria 8
8 References 8
<802.20 Evaluation Criteria>
. [Alan Chickinsky, firstname.lastname@example.org]
This document describes the evaluation criteria used by the IEEE 802.20 working group to evaluate different alternatives for inclusion into IEEE 802.20 standard. This document and the IEEE 802.20 requirements document form the basis for decisions.
Although the IEEE 802.20 standard defines operations at the Link and Physical layer of the ISO Model, many of the criteria in this document extend to other ISO layers. The evaluation criteria based on other ISO layers are for information use only. Informational areas of this document are used when other methods are insufficient to determine an alternative.
Many Internet applications including Web browsing and FTP use TCP as the transport protocol. Therefore, a TCP model is introduced to more accurately represent the distribution of TCP packets from these applications.
The amount of outstanding data that can be sent without receiving an acknowledgement (ACK) is determined by the minimum of the congestion window size of the transmitter and the receiver window size. After the connection establishment is completed, the transfer of data starts in slow-start mode with an initial congestion window size of 1 segment. The congestion window increases by one segment for each ACK packet received by the sender regardless of whether the packet is correctly received or not, and regardless of whether the packet is out of order or not. This results in exponential growth of the congestion window.
40 bytes for video-conference, 64kb/s (64kb/s*5ms/8 =40bytes)
240 bytes for video-conference, 384kb/s
T.B.C. bytes for multi-media streaming.
The computation shall take into account the influence of the MAC overheads, MAC granularity, interleaver, coding block, etc.
In order to simplify the procedure, only one type of traffic is assumed for all the Base Station subscribers. For every type of traffic shall be calculated the subscriber number, separately for up-link and down-link
6.2Payload transmission delay evaluation criteria
The delay is an important factor for real-time services.
The payload transmission delay shall be evaluated according to the same procedure and parameters, as specified for capacity evaluation. The computation shall take into account the influence of the MAC granularity, interleaver, coding block, etc.
The delay will be calculated between the moment in which the payload enters the MAC and the moment in which the payload exits the MAC, on the other side of the wireless link. The processing power of the implied devices will not be taken into account.
The calculation shall be done separately for up-link and down-link, assuming the number of subscribers resulted from capacity calculation.
IEEE C802.20-03/32, Selected Topics on Mobile System Requirements and Evaluation Criteria.
IEEE C802.20-03/33r1, Criteria for Network Capacity.
IEEE C802.20-03/35, Evaluation Methodology for 802.20 MBWA.