MITIGATING INTER-CELL PILOT INTERFERENCE VIA NETWORK-BASED GREEDY SEQUENCE SELECTION AND EXCHANGE

Abstract

for reducing cell in a cooperation manner to inter-cell interference of the pilot frequency CSI-RS CSI pilot sequence allocation. the sequence in each cell occupying the same time slot multiple subcarrier frequencies and orthogonal in time by properly selecting the cyclic shift. the sequence of a plurality of cells from the pool of non-orthogonal but for sequence resolved by their root index can be selected. because the number of channel taps is limited the cell exchange between root index allows the given cell reconstruction sequence used in the adjacent cell and interference channel estimation so as to reduce pilot pollution. In addition the invention claims a greedy selection algorithm is used for searching for further reducing the mean square error of channel estimation sequence combinations.

Allocation of CSI-RS or CSI pilot sequences among cells in a cooperative manner to reduce pilot inter-cell interference. Sequences in each cell occupy the same time slot multiple subcarrier frequencies and are orthogonal in time via properly chosen cyclic shifts. Sequences in multiple cells are chosen from a pool of non-orthogonal yet distinguishable sequences through their root indices. Exchanging root indices among cells allows a given cell to reconstruct sequences used in neighboring cells and to estimate interfering channels as the number of channel taps is usually limited thus mitigating pilot contamination. Furthermore a greedy selection algorithm to find combinations of sequences that further reduce the channel estimation mean-square- error is proposed.

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Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number				Explicitly Disclosed	Patent Type
5G	01/01/2019	ISLD-201901-001	HUAWEI	S1 TS Number: TS 138 101 Version No: Illustrative part: ---- Release: S2 TS Number: TS 138 211 Version No: Illustrative part: ---- Release: S3 TS Number: TS 138 212 Version No: Illustrative part: ---- Release: S4 TS Number: TS 138 213 Version No: Illustrative part: ---- Release: S5 TS Number: TS 138 214 Version No: Illustrative part: ---- Release: S6 TS Number: TS 138 300 Version No: Illustrative part: ---- Release: S7 TS Number: TS 138 321 Version No: Illustrative part: ---- Release: S8 TS Number: TS 138 322 Version No: Illustrative part: ---- Release: S9 TS Number: TS 138 331 Version No: Illustrative part: ---- Release: +8 -8				Yes	Family Member

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Publication No	Technology	Declaration Information			Specification Information	Explicitly Disclosed	Patent Type
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number	Explicitly Disclosed	Patent Type
WO2017067574A1	5G	01/01/2019	ISLD-201901-001	HUAWEI	S1 TS Number: TS 138 101 Version No: ---- Section No: Release : ---- S2 TS Number: TS 138 211 Version No: ---- Section No: Release : ---- S3 TS Number: TS 138 212 Version No: ---- Section No: Release : ---- S4 TS Number: TS 138 213 Version No: ---- Section No: Release : ---- S5 TS Number: TS 138 214 Version No: ---- Section No: Release : ---- S6 TS Number: TS 138 300 Version No: ---- Section No: Release : ---- S7 TS Number: TS 138 321 Version No: ---- Section No: Release : ---- S8 TS Number: TS 138 322 Version No: ---- Section No: Release : ---- S9 TS Number: TS 138 331 Version No: ---- Section No: Release : ---- +8 -8	Yes	Basis Patent
EP3353917A1	5G	01/01/2019	ISLD-201901-001	HUAWEI	S1 TS Number: TS 138 101 Version No: ---- Section No: Release : ---- S2 TS Number: TS 138 211 Version No: ---- Section No: Release : ---- S3 TS Number: TS 138 212 Version No: ---- Section No: Release : ---- S4 TS Number: TS 138 213 Version No: ---- Section No: Release : ---- S5 TS Number: TS 138 214 Version No: ---- Section No: Release : ---- S6 TS Number: TS 138 300 Version No: ---- Section No: Release : ---- S7 TS Number: TS 138 321 Version No: ---- Section No: Release : ---- S8 TS Number: TS 138 322 Version No: ---- Section No: Release : ---- S9 TS Number: TS 138 331 Version No: ---- Section No: Release : ---- +8 -8	Yes	Family Member
US2018234268A1	5G	01/01/2019	ISLD-201901-001	HUAWEI	S1 TS Number: TS 138 101 Version No: ---- Section No: Release : ---- S2 TS Number: TS 138 211 Version No: ---- Section No: Release : ---- S3 TS Number: TS 138 212 Version No: ---- Section No: Release : ---- S4 TS Number: TS 138 213 Version No: ---- Section No: Release : ---- S5 TS Number: TS 138 214 Version No: ---- Section No: Release : ---- S6 TS Number: TS 138 300 Version No: ---- Section No: Release : ---- S7 TS Number: TS 138 321 Version No: ---- Section No: Release : ---- S8 TS Number: TS 138 322 Version No: ---- Section No: Release : ---- S9 TS Number: TS 138 331 Version No: ---- Section No: Release : ---- +8 -8	Yes	Family Member
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Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
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