IEEE C802.16m-09/0593r2 Project Title
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IEEE C802.16m-09/0593r2 Project IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16> Title Proposed Amendment Text on 802.16m Link Adaptation Date Submitted 2009-03-02 Source(s) Xin Qi, Peter Wang, Joon Chun E-mail: Nokia Siemens Networks xin.qi@nsn.com Andrei Malkov, Zexian Li Nokia Seunghyun Kang, Sukwoo Lee sh_kang@lge.com, sugoo@lge.com LG Electronics Re: “802.16m AWD text”: IEEE 802.16m-09/0012, “Call for Contributions on Project 802.16m Draft AWD Content”. Target topic: “Link Adaptation”. Abstract This contribution proposes amendment text on 802.16m link adaptation Purpose To incorporate the proposed text into the 802.16m amendment. Notice Release Patent Policy This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who 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 802.16. The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat>. Proposed Amendment Text on 802.16m Link Adaptation Xin Qi, Peter Wang, Joon Chun Nokia Siemens Networks Andrei Malkov, Zexian Li Nokia Seunghyun Kang, Sukwoo Lee LG Electronics 1 IEEE C802.16m-09/0593r2 Introduction The contribution proposes the text of link adaptation section to be included in the 802.16m amendment [1]. The proposed text is developed so that it can be readily combined with IEEE P802.16 Rev2/D9 [2], it is compliant to the 802.16m SRD [3] and the 802.16m SDD [4], and it follows the style and format guidelines in [5]. Reference [1] IEEE 802.16m-09/0010, “IEEE 802.16m Amendment Working Document” [2] IEEE P802.16 Rev2/D9, “Draft IEEE Standard for Local and Metropolitan Area Networks: Air Interface for Broadband Wireless Access,” Jan. 2009. [3] IEEE 802.16m-07/002r8, “802.16m System Requirements” [4] IEEE 802.16m-08/003r7, “The Draft IEEE 802.16m System Description Document” [5] IEEE 802.16m-08/043, “Style guide for writing the IEEE 802.16m amendment” [6] IEEE 802.16m-09/0675r1, “Proposed Text on 15.x.1.3 Burst partition” 2 IEEE C802.16m-09/0593r2 Proposed Amendment Text ------------------------------------------------------------------------------------------------------------------------------------- 15.3.x Link Adaptation 15.3.x.1 DL Link Adaptation Adaptive modulation and channel coding (AMC) scheme is supported for DL transmission. The serving ABS can adapt the modulation and coding scheme (MCS) level based on the DL channel quality indicator (CQI) reported from AMS through UL feedback channel. In time-division-duplex (TDD) system DL channel quality can be also derived from the estimate of the UL channel at ABS, assuming that UL and DL channels are reciprocal. This estimate can be done relying on the UL data transmission or sounding /reference signal from AMS. 15.3.x.1.1 DL Burst Size Determination ABS decides the MCS level and MIMO mode based on the DL channel quality information for data transmission, and further decides the resource allocation based on size of MAC PDU to be transmitted. The resource allocation includes LRU type, LRU number and LRU location etc. ABS indicates MCS level, MIMO mode and LRU type/number/location to AMS, based on which AMS decides the information size in the burst by looking up the burst size table given in section 15.3.x.1.1 and performs channel decoding. If MAC PDU can not fit in the allocated LRUs, padding bits will be added to the end of the PDU. ABS can adjust the channel coding rate and remove all or part of the padding bits, to either save one LRU by increasing channel coding rate or to improve performance by reducing channel coding rate. In this case, ABS transmits Burst Size Adjustment to AMS so that AMS can calculate the PDU size and perform the correct channel decoding. The Burst Size Adjustment is denoted by and explained below. Let N Blk be the number of FEC blocks in the data burst. be the modulation and coding rate of the burst, which is indicated by the ABS based on channel quality. The corresponding channel coding rate is denoted by r , and the modulation order is denoted by m . MCS N RU be the number of LRUs to transmit the burst, indicated by ABS. N RU be the minimum number of LRUs to contain N M bits using the selected MCS and MIMO mode. LRUs using the selected N bit be the number of information bits which could be transmitted in N RU MCS and MIMO mode . 1 LRUs using the selected N bit be the number of information bits which could be transmitted in N RU MCS and MIMO mode. NM N M N bit be the number of bits in the MAC PDU to be transmitted in a burst, N bit . Nburst be the number of information bits in the burst after coding rate adjustment 3 IEEE C802.16m-09/0593r2 is determined by looking up the burst size table given in section Given N M , MCS and MIMO mode, N RU N M N bit N M padding bits need to be added to the MAC 15.3.x.1.1, so that N bit . When N M N bit , Nbit LRUs. PDU to form the information bits of the burst, so that the information size of the burst could fit in N RU ABS may decide to adjust the channel coding rate to either save one LUR by increasing coding rate, or to improve the performance of channel coding by reducing coding rate. For the case of increasing coding rate, the must be greater than 1, and the channel coding rate increase should not sacrifice PER performance to N RU below target. Selection of increasing or reducing coding rate is determined by channel state and the target BLER. The detail selection algorithm is out of scope of 16m specification. Procedure of coding rate adjustment is as follows: - N M , 0 N bit N bit Compute N bit . - If 0 , there is no need for channel coding rate adjustment. Nburst Nbit . In this case, set 0 , . N RU N RU - If 0 , ABS could decide to proceed the following coding rate adjustment. If the coding rate adjustment is not activated, bits are padded to the burst. The number of . information bits transmitted in the burst is Nburst Nbit . In this case, set 0 , N RU N RU If the coding rate adjustment is activated, padding bits are removed, 0 . The granularity of is FFS. Only bits are added to the burst. [Note: Theoretically, is the best way to remove padding bits. However, N M information bits may not fit in the coding block size table. In this case, certain number of padding bit is still needed anyway.] The number of information bits transmitted in the burst is Nburst N M . If Nburst is less than or equal to 4800 bits, then it should be a value which fits into the FEC block size table as specified in the Channel Coding section. If Nburst is larger than 4800 bits, then it should be a value of multiple of 64 bits. ABS decides whether coding rate is increased or reduced. If coding rate is increased, Set the channel coding rate adjustment indicator, rfcr 0 . 1 . N RU N RU If coding rate is to be reduced: Set the channel coding rate adjustment indicator, rfcr 1 . . N RU N RU Nburst information bits are encoded. After rate matching according to the Channel Coding section, the encoded bits are modulated and mapped to N RU LRUs. r fcr and may be transmitted in Assignment A-MAP. If 0 , coding rate adjustment is not enabled. If 0 , based on r fcr , , N RU , MCS and MIMO scheme, AMS can infer Nburst . 4 IEEE C802.16m-09/0593r2 15.3.x.1.1.1 DL Burst Size Table [Note: the burst size Table 1Error! Reference source not found. is generated based on the burst partition rule in [6]. The number of subcarriers per LRU is assumed to be 96 and the number of LRUs per burst is assumed to be from the range [1,192]. The MCS table and the FEC block size table are defined by the Channel Coding and HARQ DG.] Table 1. DL burst size table for single data stream #LRU 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 0 48 48 72 96 120 144 176 192 216 240 256 288 304 328 352 376 400 432 456 472 496 512 544 568 584 608 640 656 680 712 736 752 768 800 824 848 872 888 912 936 960 984 1000 1024 1048 1072 1096 1136 1160 1184 1216 1216 1248 1280 1280 1 48 72 120 144 184 216 256 288 328 360 400 432 472 512 544 584 624 656 696 720 768 800 848 872 912 936 984 1024 1048 1096 1136 1160 1216 1248 1280 1312 1336 1368 1424 1448 1480 1536 1560 1600 1640 1672 1712 1752 1784 1824 1864 1896 1920 1952 2000 2 64 120 160 216 272 320 376 432 480 544 600 640 696 752 800 872 912 960 1024 1072 1136 1184 1248 1280 1336 1392 1448 1504 1560 1600 1672 1712 1784 1824 1864 1920 2000 2048 2096 2144 2192 2280 2328 2368 2432 2496 2560 2560 2624 2752 2752 2816 2880 2880 2944 3 80 152 232 304 384 456 544 608 696 768 848 912 1000 1072 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8128 8320 8448 MCS level 7 8 192 240 384 472 584 712 768 936 960 1184 1160 1424 1368 1640 1536 1864 1752 2096 1920 2328 2144 2560 2328 2816 2496 3072 2752 3264 2880 3520 3072 3776 3264 3968 3456 4224 3648 4544 3840 4672 4096 4928 4224 5120 4416 5376 4608 5632 4800 5824 4992 6080 5184 6336 5376 6528 5568 6784 5760 6976 5952 7232 6144 7488 6336 7680 6528 7936 6720 8192 6912 8384 7104 8640 7296 8896 7488 9088 7680 9344 7872 9536 8064 9792 8256 10048 8448 10240 8640 10496 8832 10752 9024 10944 9216 11200 9408 11456 9600 11648 9792 11904 9984 12096 10176 12352 10368 12608 10560 12800 5 9 288 552 848 1112 1392 1672 1952 2232 2496 2816 3072 3328 3648 3904 4160 4416 4736 4992 5248 5568 5824 6080 6400 6656 6912 7232 7488 7744 8064 8320 8576 8832 9152 9408 9664 9984 10240 10496 10816 11072 11328 11648 11904 12160 12480 12736 12992 13248 13568 13824 14080 14400 14656 14912 15232 10 304 608 912 1216 1536 1824 2144 2432 2752 3072 3392 3648 3968 4288 4608 4864 5184 5504 5824 6080 6400 6720 7040 7296 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50688 51200 51776 52288 52800 53376 53888 54400 54976 55488 56000 56576 57088 57600 58176 58688 59200 59776 60288 60800 61376 61888 62400 62976 63488 64000 64576 65088 65600 IEEE C802.16m-09/0593r2 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 2944 2944 2944 3008 3008 3008 3072 3072 3072 3200 3200 3200 3200 3200 3264 3264 3264 3328 3328 3328 3392 3392 3456 3456 3456 3520 3520 3520 3648 3648 3648 3648 3648 3712 3712 3712 3776 3776 3776 3840 3840 3840 3904 3904 3968 3968 3968 4096 4096 4096 4096 4096 4096 4160 4160 4224 4224 4224 4288 4288 4288 4352 4352 4352 4416 4416 4544 4544 4544 4544 4544 4608 4608 4672 4736 4736 4800 4800 4864 4864 4928 4992 4992 5056 5056 5120 5120 5184 5184 5248 5312 5312 5376 5376 5440 5440 5504 5568 5568 5632 5632 5696 5696 5760 5760 5824 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63296 63808 64320 64832 65344 65856 66368 66880 67392 67840 68352 68864 69376 69888 70400 70912 71424 71936 72448 72960 73408 73920 74432 74944 75456 75968 76480 76992 77504 78016 78528 78976 79488 80000 80512 81024 81536 82048 82560 83072 83584 84096 84544 85056 85568 86080 86592 87104 87616 88128 88640 89152 89664 90176 90624 91136 91648 92160 92672 93184 93696 94208 94720 95232 95744 96192 96704 66176 66688 67200 67776 68288 68800 69376 69888 70400 70976 71488 72000 72576 73088 73600 74176 74688 75200 75776 76288 76800 77376 77888 78400 78976 79488 80000 80576 81088 81600 82176 82688 83200 83776 84288 84800 85376 85888 86400 86976 87488 88000 88576 89088 89600 90176 90688 91200 91776 92288 92800 93376 93888 94400 94976 95488 96000 96576 97088 97600 98176 98688 99200 99776 100288 100800 101376 101888 IEEE C802.16m-09/0593r2 192 4544 15.3.x.2 6912 10240 14592 19456 24640 29376 36864 44672 52992 58368 67840 78208 88576 97216 102400 UL Link Adaptation Adaptive modulation and channel coding (AMC) scheme is supported for UL transmission. The serving ABS can adapt the modulation and coding scheme (MCS) level based on the UL channel quality estimation and the maximum transmission power by AMS. The definition of UL channel quality indicator is FFS. The UL AMC may be integrated with UL power control and interference mitigation schemes to further achieve higher spectral efficiency. -------------------------End of Proposed Amendment Text--------------------------------------------------------- 8
