Uplink Subframe Aggregation IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16maint-08/215 Date Submitted: 2008-05-14 Source: Sten Sjoberg, Havish Koorapaty Ericsson AB E-mail: sten.ingemar.sjoberg@ericsson.com Venue: IEEE 802.16 Session #55 Base Contribution: IEEE C802.16maint-08/215r1 Purpose: To propose uplink subframe aggregation in 802.16. A logical aggregation of consecutive UL subframes to carry one MAC PDU to get improved cell coverage and to increase effective uplink data rates seen at the cell edge 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: <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 >.

Uplink Subframe Aggregation This contribution introduces a new logical concept into the 802.16 UL transmission. The proposal introduces an optional logical aggregation of consecutive UL subframes to carry one MAC PDU burst. This addresses improved cell coverage and increases effective uplink data rates at the cell edge.

The 802.16 UL problem Large imbalance in BS and MS Tx powers Transmission only a fraction of the time, equals a relatively low energy per burst Large MAC PDU overhead (10 bytes minimum OH per burst with ARQ, 22 bytes OH if CMAC is used) Fragmentation inefficient for low rate communication (due to high MAC OH)

Proposal Introduce the option of aggregating multiple UL subframes into one logical unit for modulation and decoding, where one UL MAC PDU may span over multiple frames such that enough symbol energies are accumulated for better coverage and larger payload can be accomodated for better efficiency.

Proposed Uplink Subframe Aggregation Example of transmission with aggregated uplink subframes (the same color/pattern represents one logical uplink data burst)

Gains by aggregation (example) 35:12, QPSK rate ½, 2 repetitions # of aggregated subframes (one subch) Total PHY payload bits MAC overhead MAC PDU payload PHY data rate Effective data rate 1 96 80 16 19.2 kbps 3.2 kbps 2 192 112 11.2 kbps (3.5x) (5.4 dB) 3 288 208 13.86 kbps (4.3x) (6.3 dB) 4 384 304 15.2 kbps (4.75x) (6.8 dB)

Proposed Text Additions Add a new UL-MAP Extended-2 IE Section 8.4.5.4.31 Aggregated UL-MAP IE Add text at the end of section 8.4.4.5 UL transmission allocations Add section 8.4.9.8 Segmentation for UL Frame Aggregation Add capability to 11.8.3.7.12 OFDMA MAP Capability Please see contribution C802.16maint-08/215r1or higher revision for the actual text proposal.