Further Considerations to MS-MS Power Control IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16n-11/0151 Date Submitted: 2011-09-12 Source: Eldad Zeira Voice: InterDigital E-mail: eldad.zeira@interdigital.com Anh Tuan Hoang, Haiguang Wang I2R Venue: IEEE 802.16n at session #75 responding to call for comments for AWD 802.16n-11/0015 Base Contribution: N/A Purpose: To be discussed and adopted by 802.16n 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 >. 1

Further Considerations for MS-MS Power Control Eldad Zeira, Anh Tuan Hoang, Haiguang Wang InterDigital & I2R

Goals for MS-MS power control Optimize link performance and cell interference Re-use baseline power control procedures Minimize MS computational complexity Allow BS control for MS-MS power control

Power control procedures: 802.16m For data channels (incl. MAC messages) SINRTarget is the target UL SINR needed at receiving MS P is the TX power level (dBm) per stream and per subcarrier for the current transmission L is the estimated average current DL propagation loss NI is the estimated N+I at receiving MS. Offset is a correction term. SINRMIN(dB) is for minimum rate expected by ABS. γIoT is the fairness and IoT control factor broadcasted. SIRDL is the linear ratio of the downlink signal to interference power. α depends on the number of receive antennas at receiving MS. β is set to one to account for number of streams. TNS is the total number of streams

Power control procedures: 2009 ([2] 8.4.10.3) Closed loop PC Open loop PC (optional)

Ingredients of power control in 802.16 802.16-2009 802.16m “Open” loop “Closed” loop N/A Path loss measurement On preamble “Offset” loop closure MAC message Interference control Implied, using “Offset” In combination with MS-derived value

Path loss measurement A suitable signal must be transmitted by the receiver of the data Note that all 802.16 power control procedures use average path loss HR-MS specific preamble could be used for the purpose For the case where we use group preambles (for HR-MS discovery) we could: Prevent HR-MS that already have an active link or links from being discovered in group mode, OR TDM group specific and HR-MS specific preambles in different sub-frames Preamble transmit level is made known to the transmitter of the data The transmitter of the data calculates path loss

Handling of “Offset” and other parameters Offset is best generated by the receiver of the data Offset should be indirectly controlled or constrained by the BS (e.g. w min and max placed on value or on delta) Other parameters are generated by the HR-BS and broadcast or unicast [TBD] to associated HR-MS. Forwarding HR-MS forward these parameters to un-associated HR-MS with which they have a communications channel.

Handling of Interference by MS (16m based) The added term adjusts power level to achieve an optimum between owl link performance and interference to other MS-MS links. The optimal point is controlled by the BS in the same manner as for inter-cell interference in 16m.

Text proposal - 1 Add at the bottom of section 17.3.2.7 of AWD 80216n-11_0015.pdf: The HR-BS signals power control parameters to all HR-MS with active links. HR-MS may be instructed by the HR-BS to estimate path loss between HR-MSs. The receiver of data generate offset controls that are based on constraints or parameters, signaled from HR-BS Cross link interference is handled by augmenting the PC to include SIR measured on crosslink resources The same procedure is applied for BS-controlled FTN and BS-controlled direct communication.

Text proposal 1 – cont’d For power control, HR-MS shall use a modified eqn. 292: Add the following descriptors is a fairness parameters for interference to other MS-MS transmissions , and - is the linear ratio of the signal to interference power as received by the power controlled MS, measured on resources used for MS-MS links as determined by the BS.

Text proposal - 2 Add at the bottom of section 17.2.2.7 of AWD 80216n-11_0015.pdf: The HR-BS signals power control parameters to all HR-MS with active links. HR-MS may be instructed by the HR-BS to estimate path loss between HR-MSs. The receiver of data generate offset controls that are based on constraints or parameters, signaled from HR-BS The same procedure is applied for BS-controlled FTN and BS-controlled direct communication.

References [1] 802.16m amendment (D12) [2] 802.16 “2009” [3] UL open loop PC recommendations IEEE s802.16m-09/0546