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PERMUTATION. Evaluation Scenarios. BW = 10 MHz, N PRU = 48 (N 1 = 4, N 2 = 1). Scenario1 (Mixed Reuse 1&3 – equal size). Scenario 3 (Reuse 1). Scenario 2 (Mixed Reuse 1&3 – unequal size). Scenario 4 (Reuse 3). Evaluation Criteria Description. Diversity gain for distributed resources

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PERMUTATION

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PERMUTATION


Evaluation Scenarios

BW = 10 MHz, NPRU = 48 (N1 = 4, N2 = 1)

Scenario1 (Mixed Reuse 1&3 – equal size)

Scenario 3 (Reuse 1)

Scenario 2 (Mixed Reuse 1&3 – unequal size)

Scenario 4 (Reuse 3)


Evaluation Criteria Description

  • Diversity gain for distributed resources

    • Calculate the equivalent SNR of each LRU and plot the histogram

    • Find 10% outage SNR, i.e, the SNR value which can be achieved with outage 0.1.

  • Scheduling gain for contiguous resources

    • Calculate the equivalent SNR of each LRU and select the best LRU for each FFR. Plot the histogram of the best SNR.

    • Find 10% outage SNR, i.e, the (best) SNR value which can be achieved with outage 0.1.

  • Hit ratio for distributed resources

    • Average number of subcarrier pairs hit by neighboring cell.


DL Permutation Demonstration Model

DLRU: Distributed LRU


Part IComparison of Subband Partitioning and Miniband Permutation Proposals


Comparison of Subband Partitioning and Miniband Permutations

  • Compare Intel1, Intel2, LGE, Samsung, Motorola

  • Same subcarrier perm used for all proposals

    • perm_seq() israndom permutation

    • Shift by symbol and subframe index according to Intel’s formula.


Study 1: 10% SNR Values

Scenario1 (Mixed Reuse 1&3 – equal size)

Scenario 3 (Reuse 1)

Scenario 2 (Mixed Reuse 1&3 – unequal size)

Scenario 4 (Reuse 3)


Diversity and scheduling gain in Scenario 1


Diversity and scheduling gain in Scenario 2


Diversity and scheduling gain in Scenario 3


Diversity and scheduling gain in Scenario 4


Conclusions of Part I

  • Proposals from Intel (1&2), LGE, and Samsung have the best performance in terms of diversity and scheduling gain.


Part IIComparison of Subcarrier Permutation Proposals


Comparison of Subcarrier Permutation Proposals

  • Compare subcarrier permutation proposed by Intel, LGE, Samsung, and random permutation

  • Use Intel1 SB partitioning and Intel MB permutation

  • Random permutation: PermSeq is random, shifted over symbols and subframes according to Intel’s formula.

  • Calculate diversity gain for different subcarrier perms for Scenarios 1, 2, and 3.


Diversity gain: 10% SNR Values

Scenario1 (Mixed Reuse 1&3 – equal size)

Scenario 3 (Reuse 1)

Scenario 2 (Mixed Reuse 1&3 – unequal size)


Diversity gain in Scenario 1


Diversity gain in Scenario 2


Diversity gain in Scenario 3


Conclusions of Part II

  • Subcarrier permutation methods proposed by Intel and Samsung have the best diversity gain.


Part IIIComparison of Average Hit Number


DL Hit Number Comparison

  • Compare the number of hits among different Cell ID pairs for the subcarrier permutations proposed by Intel, Samsung and LGE.

  • 0≤Cell_ID <512, 130816 Cell_ID Pairs

  • Intel

    • PermSeq remains the same for all cells.

  • Samsung and LTE:

    • Different PermSeq for different cells:

    • LGE: different shift as function of Cell_ID

    • Samsung: different SEED as function of Cell_ID


Hit Number Comparison

  • k: number of subcarrier pairs hit within an LRU,

  • (0 ≤ k ≤ kmax and kmax = Nsym*Lpair = 48)

  • Calculate the fraction of LRUs hit at k≥12 subcarrier pairs (25%)

Reuse 1, NPRU = 48


Conclusions of Part III

  • For small number of DRU Intel’s subcarrier permutation has the best performance.

  • Intel and LGE’s subcarrier permutations have the best performance for large number of DRUs.


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