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Frequency Reuse in Mobile WiMAX

WiMAX Solutions Division

July 14, 2006

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Frequency Reuse in Mobile WiMAX

Mobile WiMAX or 802.16-2005 supports two fundamental reuse schemes

1x3x1 or reuse 1

All the same sub-channels in all sectors

No sub-channel orthogonality between sectors within a base station FUSC (Full Usage of Sub-Channels) permutation scheme results in frequency

diversity as well as interference averaging

1x3x3 or reuse 3

Only a sub-set of sub-channels utilized in each sector of a base station Sub-channel orthogonality is preserved across sectors of a base station

PUSC (Partial Usage of Sub-Channels) permutation scheme results in frequencydiversity as well as interference averaging

Mobile WiMAX also supports Fractional Frequency Reuse or FFR which is a combinationof reuse 1 and reuse 3

MAP and DATA can be on different reuse schemes

The next two slides graphically illustrates these different reuse schemes

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Reuse 1 Reuse 3

Each sector of a BS have access to only a subset of sub channels

ll sectors of each BS have access to all sub channels

Frequency Reuse 1 and 3 with FUSC/PUSC

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Fractional Frequency Reuse reduces outage and boosts

throughput

Fractional Frequency reusesupported by Mobile WiMAXStandard

Reuse 1 (F1) or reuse 3 sub-carrier

allocation (S1-S3) via zone switchingbased on SINR Fractional frequency reuse is

expected to boost throughput andreduce outage in higher loadingscenarios

Fractional frequency reuse isexpected to be implemented by somevendors

F1 F1

F1

F2, S2

F1 F1

F1

F1, S1F2, S2

F3, S3

F1 F1

F1

F3, S2

F1, S1

F1, S1 F2, S2

F3, S3

Reuse 3

where there is low SINR

Reuse 1

where there is high SINR

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Summary and Recommendations

Based on simulations and theoretical analysis Intel believes both reuse 1 and

reuse 3 will work for data allocations for all wave 2 systems

Reuse 3 may be a requirement for robust MAP performance (data can remain in

reuse 1)

Theoretical analysis indicates that fully loaded wave 1 systems will require reuse

3 while wave 2 systems will work with reuse 1

FFR, if implemented by vendors, will further optimize performance

Upcoming field trials in 2006 and early 2007 will shed more light on reuse vs.

loading vs. outage

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BACKUP

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OFDMA Sub-channel Permutation

Contiguous permutation: AMC

Diversity permutation: FUSC, PUSC

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