Strong interference case from an adjacent Femtocell Document Number: IEEE C80216m-09/0631 Date Submitted: 2009-03-02 Source: Mamadou Kone, Ming-Hung Tao,

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Strong interference case from an adjacent Femtocell Document Number: IEEE C80216m-09/0631 Date Submitted: Source: Mamadou Kone, Ming-Hung Tao, Ying-Chuan Hsiao ITRI Venue:IEEE Session #60, Vancouver, Canada Base Contributions: Re: CR for tgmsdd Purpose: Discussion and Approval Notice: This document does not represent the agreed views of the IEEE 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and

Motivation MS under strong interference poses challenging interference mitigation issues The Section 17.8 propose some solutions: – MS to report the interference to the serving BS – The serving BS and/or the network may request the interfering Femtocell BS to mitigate the interference However none of this solution addresses the following scenario: – MS may not be able to access the network at all – MS may be able to report but still the communication of two femto BSs over the air is not defined… 2

First case: MS has no access to the network Therefore MS cannot report the interference back to its serving BS Back Haul communication FBS2 FBS1 MS1

Second case: MS has a weak interference MS may be able to report the interference, but the serving BS cannot join with the interfering BS – No air interface between two Femto BSs – If different provider, so no backhaul communication – Which femto BS should block its resource? Back Haul communication No air interface communication FBS1 MS1FBS2

First case solution: Use interfering Femto BS Femto BS detects an MS A-Preamble over the air – Decode the A-Preamble to find out the serving BS ID – Use the backhaul to communicate with the serving BS to mitigate interference – If not belonging to the same provider, femtoBS may use the back haul to inform Macro BS of the matter to resolve the interference issue. Propose to make a change of the subsection “ Femto BS detection” to solve that matter. 5

Second case solution: Use the network to resolve the interference A femto BS is informed by its MS of the existence of adjacent interfering femto BS: – Femto BS contact the Macro BS through the back haul – The network is informed of the situation The network solve properly this kind of issue by contacting the different femto BS: – Redefine their resources profiles by blocking some to avoid interference – Contact onf of them to reduce its transmission power if necessary. 6

Suggested Text Insert the following paragraph into Section 17.8, on page Start of Text Femtocell BS detection A Femtocell BS may monitor UL signal from an MS which is served by overlay macro BS/ Femtocell BS. The monitoring is initiated by overlay macro BS or femto BS to detect the existence of the MS in its coverage. Then the Femtocell BS can inform the macro BS over the backhaul that the MS is in its coverage and subsequently handover to Femtocell BS or interference mitigation can be accomplished Interference Avoidance and Interference Mitigation Large interference from an inaccessible Femtocell may trigger the interfering femto BS to report the MS femto BS ID to Macro BS. Then the network may redefine the two femto BS resources configuration and or request to one of them to mitigate the interference by reducing transmission power. 7