Draft 802. 20 Permanent Document




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IEEE P 802.20™/PD/V

Date:
Draft 802.20 Permanent Document


<802.20 Evaluation Criteria – Ver 01>

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.


Contents


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>

1Overview

1.1Scope


. [Alan Chickinsky, alan.chickinsky@ngc.com]

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.

1.2Purpose


.

1.3Organization of the Document


[Alan Chickinsky, alan.chickinsky@ngc.com]

2Link level Modeling

2.1Modeling assumptions



2.2Performance metrics


b/N0>

3System Level Modeling

3.1Cell layout



3.2Antenna Pattern and Orientation

3.3Propagation Model




3.4Fading Models

3.4.1Slow Fading Model



3.4.2Fast Fading Model



3.5Traffic Modeling

3.5.1Traffic Mix




3.5.2Traffic Models



3.6Higher Layer Protocol Modeling



3.6.1HTTP Model

3.6.2TCP Model


[Farooq Khan, fkhan1@lucent.com]

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.


3.6.2.1TCP Connection Set-up and Release Procedure


The TCP connection set-up and release protocols use a three-way handshake mechanism as described in Figure 1 and Figure 2. The connection set-up process is described below:

  1. The transmitter sends a 40-byte SYNC control segment and wait for ACK from remote server.

  2. The receiver, after receiving the SYNC packet, sends a 40-byte SYNC/ACK control segment.

  3. The transmitter, after receiving the SYNC/ACK control segment starts TCP in slow-start mode (the ACK flag is set in the first TCP segment).

The procedure for releasing a TCP connection is as follows:



  1. The transmitter sets the FIN flag in the last TCP segment sent.

  2. The receiver, after receiving the last TCP segment with FIN flag set, sends a 40-byte FIN/ACK control segment.

  3. The transmitter, after receiving the FIN/ACK segment, terminates the TCP session.


Figure 1: TCP connection establishment and release for Uplink data transfer


Figure 2: TCP connection establishment and release for Downlink data transfer


3.6.2.2TCP slow start Model


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.

3.6.2.3TCP Flow control Model



3.7Backhaul Network Modeling

3.7.1Network Delay models



3.7.2Network Loss models



3.8Mobility Modeling



3.9Control signaling modeling

3.9.1DL signaling models



3.9.2UL signaling models



4Channel Modeling

4.1Channel Mix




4.2Channel Models



5Output Metrics



6Payload Based Evaluation


[Marianna Goldhammer, marianna.goldhammer@alvarion.com]

The payload-based evaluation method for MAC-Modem-Coding capacity and delay performance assessment is described below.


6.1Capacity performance evaluation criteria


In order to evaluate the different proposals capacity performance, it is useful to define evaluation scenarios. The evaluation parameters are:

  • Channel spacing: 1.25MHz and 5MHz

  • Modem rate (max rate & minimum coding, medium rate & medium coding, minimum rate & maximum coding);

  • MAC frame duration: 5ms

For capacity evaluation, the payloads associated with every type service are:

  • 30 bytes for VoIP, G.729 codec, 30ms period

  • 1518 bytes for long IP packets;

  • 64 bytes for short IPv4 packets;

  • 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.


7Fairness Criteria



8References


  1. IEEE C802.20-03/32, Selected Topics on Mobile System Requirements and Evaluation Criteria.

  2. IEEE C802.20-03/33r1, Criteria for Network Capacity.

  3. IEEE C802.20-03/35, Evaluation Methodology for 802.20 MBWA.

  4. IEEE C802.20-03/43, 802.20 Evaluation Methodology Strawman - 00.






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