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Structure of the “Resource Allocation” field in the A-AMAP IEs – Proposal Summary Document Structure of the “Resource Allocation” field in the A-AMAP IEs – Proposal Summary Document Number: IEEE C 80216 m-09_1328 Date Submitted: 2009 -07 -06 Source: Sudhir Ramakrishna, Youngbo Cho, Hyunkyu Yu, Jeongho Park, Heewon Kang, Zhouyue Pi E-mail: sudhir. [email protected] com Venue: Re: 802. 16 m amendment working document Category: AWD Comments Area: Chapter 15. 3. 6 (DL Control) Base Contribution: IEEE C 80216 m-09_1328 Purpose: To be discussed and adopted by TGm for the 802. 16 m AWD Notice: 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. Release: 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. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and . Further information is located at and .

Associated AWD Text Proposal • Contribution C 80216 m-09_1331 provides the AWD text defining Associated AWD Text Proposal • Contribution C 80216 m-09_1331 provides the AWD text defining the structure & interpretation of the “Resource Allocation” field, and the interpretation of the associated IEs, for the 5, 10 and 20 MHz cases Summary of this contribution • This contribution provides a high-level summary of the detailed RA field text in Contribution C 80216 m-09_13331, and provides some motivation, background & pointers to some supporting simulation results for the RA field design. IEEE_C 80216 m-09_1328 Slide #2

DRU/Mini-Band CRUs : RA Field Design Goals • Should be possible to indicate a DRU/Mini-Band CRUs : RA Field Design Goals • Should be possible to indicate a 1 LRU assignment • No un-assigned LRUs due to assignment indication limitations For Vo. IP support, need to indicate assignment of 1/2/3/4 & 6 LRUs • RA field as small as possible, to keep signaling efficient • DRU/Mini-Band CRUs : RA Field Design Summary • Use “channel tree” approach § Nodes at bottom level of tree represent LRUs § Each node in tree, indexed by RA, indicates assignment of all nodes at bottom level branching from it • Select § 1 channel tree such that LRU granularity at lower assignment sizes to support Vo. IP § Lower granularity at larger assignment sizes o Leads to reduction in number of nodes in tree reduction in size of RA field Granularity less important at larger assignment sizes, will not affect performance in “full buffer” type traffic o In RL, large assignments unlikely due to transmit power limitations o IEEE_C 80216 m-09_1328 Slide #3

Sub-band CRUs : RA Field Design Goals • From DL system-level simulation results in Sub-band CRUs : RA Field Design Goals • From DL system-level simulation results in [2] § Allocation o For this use case, using a common MCS for all assigned sub-bands leads to very small performance difference § Ability o of smaller (<= 3) number of sub-bands is an important (dominant) use-case to indicate non-contiguous sub-band allocations important Can lead to performance gains (with PF scheduler) over purely contiguous allocations Sub-band CRUs : RA Field Design Summary • For allocation of sub-bands with contiguous indices, leverage channel tree indication method • In all cases, all possible allocations of sub-bands with contiguous indices can be indicated • RA field indexing designed so that • Using 1 IE, can indicate most combinations of non-contiguous assignments of small (<= 3) number of sub-bands • For allocation of larger # of non-contiguous sub-bands, use 2 IEs, and indicate using concatenated RA fields • Do not need more than 2 IEs IEEE_C 80216 m-09_1328 Slide #4

RA Field Structure • For each of the BW cases (5 MHz, 10 MHz RA Field Structure • For each of the BW cases (5 MHz, 10 MHz & 20 MHz) • Use x + 1 bits for the RA Field §x bits for RA itself (x depends on bandwidth and # of LRU combinations to be indicated) § 1 distinguisher bit, called RA_Specifier, to distinguish between contiguous and noncontiguous LRU allocations o Non-contiguous IEEE_C 80216 m-09_1328 indicator used in sub-band allocations Slide #5

RA Field - Design Summary for 5/10/20 MHz 5 MHz 10 MHz 20 MHz RA Field - Design Summary for 5/10/20 MHz 5 MHz 10 MHz 20 MHz # of LRUs 24 48 96 # of sub-bands 6 12 24 # of all possible contiguous LRU allocations 300 1176 4656 # of resource indication bits 7 Resource Allocation (RA) bits + 1 specifier bit = 8 bits total 8 RA + 1 specifier 10 RA + 1 specifier # of possible contiguous LRU allocations indicable 117/300 252/1176 981/4656 Highest difference between consecutive contiguous LRU sizes 4 4 4 Non-contiguous sub-band allocations using 1 IE All combinations of 2 SBs, almost all (210/220) combinations of 3 SBs All combinations of 2 SBs, some combinations of 3 SBs 1 2 2 Max. # of IEs needed for all possible non. SS_RAField_IEEE_C 80216 m-09_1328 contiguous sub-band Slide #6

5 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #7 5 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #7

5 MHz - Summary • 24 • RA LRUs, 6 sub-bands Field = 8 5 MHz - Summary • 24 • RA LRUs, 6 sub-bands Field = 8 bits • Use 7 -bits RA + 1 bit RA_Specifier • RA_Specifier used to distinguish sub-band-CRU allocations vs DRU/miniband CRU allocations • Design summary • Full flexibility for sub-band allocation with 1 sub-band granularity • For contiguous (DRU/mini-band CRU) allocations – can indicate 117 of the 300 possible combinations • Never need more than 1 AAMAP IE for any allocation SS_RAField_IEEE_C 80216 m-09_1328 Slide #8

5 MHz – Channel tree for contiguous allocations 117 nodes in tree, indexed by 5 MHz – Channel tree for contiguous allocations 117 nodes in tree, indexed by 7 -bit RA Each node allocates all the nodes at bottom level (Level 10) that it is connected to. Allows indication of 117 of the 300 possible combinations of contiguous LRU indices (24 LRUs = 300 contiguous combinations) SS_RAField_IEEE_C 80216 m-09_1328 Slide #9

5 MHz DL Flow – 7 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 5 MHz DL Flow – 7 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 m-09_1328 Slide #10

5 MHz – Indexing Tables • Table_RA_1 : This table maps value of 7 5 MHz – Indexing Tables • Table_RA_1 : This table maps value of 7 -bit RA to a node in the channel tree, and then to a set of contiguous LRU indices. SS_RAField_IEEE_C 80216 m-09_1328 Slide #11

10 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #12 10 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #12

10 MHz - Summary • 48 LRUs, 12 sub-bands • RA • Field = 10 MHz - Summary • 48 LRUs, 12 sub-bands • RA • Field = 9 bits 8 -bit RA + 1 bit RA_Specifier • Design summary • Contiguous allocations – use a channel tree, allowing indication of 252 of the 1176 possible LRU allocations • Non-contiguous sub-band allocations With 1 IE, can indicate all 2 and almost all (210/220) 3 non-contiguous sub-band allocations • With 2 IEs, concatenate 8 bit RA in each IE, interpret resultant as a 12 bitmap to allow arbitrary allocations of the 12 sub-bands • Never use more than 2 IEs • SS_RAField_IEEE_C 80216 m-09_1328 Slide #13

10 MHz – Channel tree for contiguous allocations 252 nodes in tre indexed by 10 MHz – Channel tree for contiguous allocations 252 nodes in tre indexed by 8 -bi SS_RAField_IEEE_C 80216 m-09_1328 Slide #14

10 MHz DL Flow – 8 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 10 MHz DL Flow – 8 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 m-09_1328 Slide #15

10 MHz – Indexing Tables • Table_RA_2 : This table maps value of 8 10 MHz – Indexing Tables • Table_RA_2 : This table maps value of 8 -bit RA to a node in the channel tree, and then to a set of contiguous LRU indices. • Table_RA_3 & Table_RA_4: Map 8 -bit RA to indices of 2 & 3 non-contiguous sub-bands • These tables are specified in the text proposal. SS_RAField_IEEE_C 80216 m-09_1328 Slide #16

20 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #17 20 MHz SS_RAField_IEEE_C 80216 m-09_1328 Slide #17

20 MHz - Summary • 96 LRUs, 24 sub-bands • RA field = 11 20 MHz - Summary • 96 LRUs, 24 sub-bands • RA field = 11 bits • 10 -bit • Design RA + 1 bit RA_Specifier summary • Contiguous allocations – use a channel tree, allowing indication of 981 of the 4656 possible LRU allocations • Non-contiguous sub-band allocations Design very similar to the 10 MHz case • With 1 IE, can indicate all 2 non-contiguous sub-band allocations, and some of the 3 subband possibilities • With 2 IEs, concatenate 10 bit RA, interpret resultant as a 20 bitmap to allow arbitrary allocations of up-to 20 sub-bands • For allocations larger than 20 sub-bands, use contiguous sub-band indices • Never use more than 2 IEs • SS_RAField_IEEE_C 80216 m-09_1328 Slide #18

20 MHz – Channel tree for contiguous allocations SS_RAField_IEEE_C 80216 m-09_1328 Slide #19 20 MHz – Channel tree for contiguous allocations SS_RAField_IEEE_C 80216 m-09_1328 Slide #19

20 MHz DL Flow – 10 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 20 MHz DL Flow – 10 bit RA + 1 bit Specifier SS_RAField_IEEE_C 80216 m-09_1328 Slide #20

20 MHz – Indexing Tables • Table_RA_5 : This table maps value of 10 20 MHz – Indexing Tables • Table_RA_5 : This table maps value of 10 -bit RA to a node in the channel tree, and then to a set of contiguous LRU indices. • Table_RA_6 & Table_RA_7 : Maps 10 -bit RA to indices of 2 or 3 noncontiguous sub-bands These tables are specified in the text proposal SS_RAField_IEEE_C 80216 m-09_1328 Slide #21

References • [1] C 80216 m-09_0918 r 2, “Proposed AWD text specifying the “Resource References • [1] C 80216 m-09_0918 r 2, “Proposed AWD text specifying the “Resource Allocation” field in the Basic Assignment A-MAP IEs”, presented in IEEE 802. 16 m Session 61 (in Cairo). • [2] C 80216 m-09_0917 r 2, “Design of the “Resource Allocation” field in the Basic Assignment A-MAP IE: Simulation results, Insights & Methodology”, presented in IEEE 802. 16 m Session 61 (Cairo). SS_RAField_IEEE_C 80216 m-09_1328 Slide #22