PERMUTATION

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# PERMUTATION - PowerPoint PPT Presentation

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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Presentation Transcript
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.

### 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)

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)

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.