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## PowerPoint Slideshow about 'PERMUTATION' - cosima

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### Part IComparison of Subband Partitioning and Miniband Permutation Proposals

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

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.

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.

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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