IST-4-027756 WINNER II D6.13.12 v1.0 Final CG “local area ...

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WINNER II D6.13.12 v1.0transmission is larger than in e.g. a wide area scenario. On the other hand, in an isolated cell macrodiversitygains [WIN2D461] cannot be obtained. The exact threshold in number of users is a parameter inthe configuration, and can be tuned by measurements in a deployed system or by simulations prior todeployment.Finally, the peer-to-peer MAC should also co-exist efficiently with the other transmission modes in thelocal area case. In [WIND210] the peer-to-peer transmission mode was described, and it was located inthe DAC frequency bandwidth. Since the DAC channel is not envisioned in the final system concept[WIN2D61314], resources for the peer-to-peer mode as described in [WIND210] has to beaccommodated in a dedicated frequency sub-band. No further work on integration and refinement of thepeer-to-peer mode has been carried out in WINNER II.Page 62 (86)
WINNER II D6.13.12 v1.010. Decentralized Interference ManagementIn self-organizing wireless networks sophisticated network planning that minimizes the interferencetowards adjacent cells is not feasible. In particular, big buildings where many people gather, such asshopping malls, airports or train stations may have many distributed base stations and relays deployed. Asthese base stations might not even belong to the same operator, there is a need for efficient decentralizedinterference management. In this section an interference aware dynamic channel allocation algorithm ispresented, and its performance is assessed for a local area peer-to-peer network. The algorithm facilitatesself-organized interference management and is applicable to arbitrary network topologies.10.1 Decentralized dynamic channel allocation for the WINNER TDD modeIn [WIN2D472] section 5.3, a decentralized MAC protocol to dynamic and interference aware chunkselection is applied to the WINNER TDD mode. The proposed scheme enables the transmitter todetermine the level of interference it would cause to already active links prior to any transmission. This isachieved through busy-slot signalling that exploits the channel reciprocity offered by the TDD mode. Thebusy signal concept is implemented by a time-multiplexed feedback channel that also establishes a lowratefeedback link.The ability to facilitate self-organized interference management is demonstrated for a local area peer-topeernetwork. There an indoor deployment environment as defined as scenario A1 in [WIN2D111] wasimplemented where UTs are randomly placed. Instead of communicating with a base station the UTsdirectly communicate in a peer-to-peer fashion.By letting receivers transmit a busy-signal in an associated mini-slot [OH04], [OHA07], two importantgoals are accomplished. First, the own transmitter is informed about the level of interference at thereceiver. Second, at the same time other nodes intending to establish a transmission are notified aboutongoing transmissions, so that these nodes can take appropriate steps to avoid interference. Therefore,both channel sensing and reservation are accomplished. Since there is no central controller whichcoordinates the individual links, network operation in a decentralized, self organized manner ismaintained. Moreover, a method for interference management is established so that time-frequency slots(chunks) can be dynamically assigned on a short-term basis. In effect the proposed protocol termed busytone OFDMA (BT-OFDMA) establishes a decentralized dynamic resource partitioning. Unlike staticresource partitioning, non-uniform distribution of user locations and/or bursty traffic loads can beexploited.The attainable improvements of BT-OFDMA are offset by the required additional signalling overhead,which is in our studies one OFDM symbol per uplink and downlink slot, which results in 6.7% signallingoverhead. On the other hand, instead of simply dismissing the busy-tone as overhead, an alternativeinterpretation is to view the busy-slot as a feedback link from the receiver to the transmitter. To this end,the considered MU-MIMO schemes considered for local area require instantaneous CSI at the transmitter,which typically requires the UT to transmit pilots. For instance, in the mobile WiMAX standard 802.16e,for uplink channel sounding the BS can request a mobile to transmit pilots. Provided that these pilots arelocated on the busy slot both goals are accomplished: transfer of CSI from receiver to transmitter; andinterference management. Moreover, with the use of hybrid ARQ and adaptive modulation and codingschemes, the provision of a reliable feedback link with low latency is becoming increasingly important.To this end, various types of feedback information may be ‘piggy packed’ on the busy-slot.Page 63 (86)
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WINNER II D6.13.12 v1.01. Introduct
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IST-4-027756 WINNER II D6.13.12 v1.0 Final CG “local area ...

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