IEEE C802.16a-02/46. IEEE Broadband Wireless Access Working Group <
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1 IEEE C802.16a-02/46 Project Title Date Submitted IEEE Broadband Wireless Access Working Group < A Contribution to a: MAC Frame Sizes Source(s) Re: Lei Wang Shane Rogers Brian Gieschen Gordon Antonello Shawn Taylor Wi-LAN Inc Sunridge Way, NE Calgary, AB, Canada, T1Y 7K7 This is a contribution to IEEE a. Voice: (403) Fax: (403) LeiW@wi-lan.com Abstract Purpose Notice Release Patent Policy and Procedures This contribution provides an analysis on the MAC frame sizes vs. system performance. To support the comment of changing the maximum MAC frame size from 10ms to 20ms, for OFDM PHY systems. This document has been prepared to assist IEEE It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE The contributor is familiar with the IEEE Patent Policy and Procedures (Version 1.0) < including the statement IEEE standards may include the known use of patent(s), including patent applications, if there is technical justification in the opinion of the standards-developing committee and provided the IEEE receives assurance from the patent holder that it will license applicants under reasonable terms and conditions for the purpose of implementing the standard. Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <mailto:r.b.marks@ieee.org > as early as possible, in written or electronic form, of any patents (granted or under application) that may cover technology that is under consideration by or has been approved by IEEE The Chair will disclose this notification via the IEEE web site < 0
2 MAC Frame Sizes versus System Performance 1. Introduction Lei Wang Wi-LAN Inc. This document provides an analysis of system performance versus MAC frame sizes in support the comment of increasing the maximum allowable MAC frame size from 10ms to 20ms for the OFDM PHY based systems. 2. References IEEE P802.16a/D MAC Frame Size vs. Uplink Throughput The analysis will use the parameter values given in Table 197, page 135, of P802.16a/D2 document, for the OFDM PHY with 3.5 MHz channel size, 256-FFT, and 16QAM, FIGURE 1 shows the interaction between the MAC frame size, uplink throughput and the number of supported Subscriber Stations (SS's), within a given max tolerable delay in an a OFDM TDD system. The max tolerable delay at an a system is assumed to be 40ms in FIGURE 1. Note that a larger MAC frame size results in a higher uplink throughput, for any given number of supported subscriber stations. The reason for this result is that a larger MAC frame size allows a larger uplink transmission and more OFDM data symbols with the same PHY and control overhead. 4. MAC Frame Size vs. System Capacity (Number of Supported SS's) Also, FIGURE 2 shows that, for the same uplink throughput and tolerable delay, a larger MAC frame size results in better system capacity in terms of the number of supported SS's. 1
3 Frame Sizes vs. UL Throughput vs. Number of SS s (max delay=40ms) 4000 UL througput (Kbps) ms_fr 10ms_fr 20ms_fr num of SS s FIGURE 1 MAC Frame Size vs. Uplink Throughput and Number of Supported SS's 5. MAC Frame Size vs. TCP Performance The MAC frame size affects the TCP round trip delay of the TCP applications over an a system. For a given TCP window size, when the available network bandwidth is high, the TCP round trip delay may affect the TCP throughput. The TCP window size is the amount of data that can be buffered at the receive side of a TCP connection. The sending host can send only that amount of data before receiving an ACK from the receiving host. In Microsoft Windows 2000 TCP/IP implementation, the TCP window size is normally (by default) set to 17,520 (16K rounded up to byte segments). Using the parameter values given in Table 197, page 135, of P802.16a/D2 document, for the OFDM PHY with 3.5MHz channel, 256-FFT, and 16QAM, an a OFDM TDD system can provide an uplink throughput about 3.22 Mbps to 3.86 Mbps depending on the MAC frame size. Using 4Mbps as the available uplink throughput and 17,520 as the TCP window size, FIGURE 2 shows MAC frame size versus TCP throughput and number of users, under the consideration that the TCP one-way end-to-end delay is the sum of the MAC frame size and a fixed delay representing other network elements in the connection. The fixed delay is 30ms in FIGURE 2. 2
4 MAC Frame Size vs. TCP throughput TCP Throughput (Kbps) ms_fr 10ms-fr 20ms-fr num of users FIGURE 2 MAC Frame Size vs. TCP Throughput Note that only when the number of users is very small, e.g., smaller than 4, different MAC frame sizes result in slightly different TCP throughputs. In any practical a networks, the number of users will be more than MAC Frame Size vs. Transmission Efficiency The transmission efficiency here refers to the ratio of the overhead in a transmission on the wireless link. The overhead includes PHY preambles and control costs such as downlink FCH (frame control header), uplink initial ranging slots, uplink bandwidth request slots. The control messages, such as DCD, UCD, MAPs, are overhead, too. However, for simplicity, they are not considered in calculations reported here. For the OFDM PHY systems, assume that each MAC frame has one initial ranging slot and one bandwidth requesting slot, each with 3 OFDM symbols. Table.1 MAC Frame Size vs. Overhead Ratio (OFDM 256-FFT) MAC Frame Size 5 ms 10 ms 20 ms DL transmission overhead ratio 8.6% 4.3% 2.1% 3
5 UL transmission overhead ratio If 1 regular UL Tx per MAC frame If 2 regular UL Tx per MAC frame If 4 regular UL Tx per MAC frame 20% 10% 5% 22.9% 11.4% 5.8% 28.6% 14.3% 7.1% Note that a larger MAC frame size results in a smaller overhead ratio, i.e., a more efficient transmission. This is also true for the OFDMA PHY 2k-FFT systems, as shown in Table.2, with the assumption that each MAC frame has one subchannel for ranging and one subchannel for bandwidth requesting. Table.2 MAC Frame Size vs. Overhead Ratio (OFDMA 2k-FFT) MAC Frame Size 5 ms 10 ms 20 ms DL transmission overhead ratio 25% 14.3% 6.3% UL transmission overhead ratio 29.7% 16.7% 11.5% 7. MAC Frame Size vs. Buffer Size Depending on implementation, buffers may be required to temporarily store the data received or to be transmitted at a unit (either a BS or a SS) in an a system. Table 3 shows the required buffer sizes for different MAC frame sizes, with 64QAM OFDM/OFDMA systems. Table.3 MAC Frame Size vs. Buffer Requirement (64QAM OFDM/OFDMA) OFDM (256-FFT) OFDMA (2k-FFT) MAC frame size 5 ms 10 ms 20 ms 5 ms 10 ms 20 ms Buffer size for buffering one MAC Frame 6,588 14,148 29,484 5,022 10,044 25,110 Note that a larger MAC frame needs a larger buffer. However, even with 64QAM, buffering a 20ms-MAC frame only needs about 15K more than buffering a 10ms-MAC frame. 32M of memory costs about $8. In addition, often implementations are available that do not require buffering entire frame. 4
6 8. Conclusion In conclusion, the analysis results presented above strongly supports the comments of changing the max MAC frame size from 10ms to 20ms for the a OFDM PHY systems, because of: a) Better throughput; b) Better system capacity (number of supported SS's); c) More efficient transmission (smaller overhead ratio); d) Negligible impact on TCP performance when the number of users is very small (less than 4); no impact at all when the number of users is more than 4; e) Very small buffer requirement increase (negligible cost increase with currently available commercial memory chips, also it is easily implementable in custom ASIC); f) Good alignment with VoIP packetization rate (1pkt/20ms); g) Only suggested as max MAC frame size (allowing smaller sizes, such as 2ms, 2.5ms, 3ms, ). 5
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