Systems and methods for effective physical cell identifier reuse

Patent metadata

Field	Value
Publication number	US-2016143068-A1
Application number	US-201514595031-A
Country	US
Kind code	A1
Filing date	Jan 12, 2015
Priority date	Nov 13, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

Systems and methods for allocating a physical cell identifier (PCI) to a cell are described. In one implementation, the method comprises identifying allocated physical cell identifiers based on PCI data and generating a near PCI list and a far PCI list based on the allocated PCIs and a RSRP threshold value. Further, the method comprises determining cell group IDs and a cell IDs from the near PCI list and the far PCI list. Further, the method comprises assigning the cell group IDs to a first bin and the cell IDs to a second bin. Further, the method comprises prioritizing the cell group IDs in the first bin based on effective distance and the cell IDs in the second bin based on an effective RSRP value. Further, the method comprises allocating the PCI, to the cell, determined based on the prioritized cell group IDs and the cell IDs.

First claim

1 . A computer-implemented method for allocating a physical cell identifier (PCI) to a cell in a wireless communication network, the method comprising:
identifying, by a processor, allocated physical cell identifiers (PCIs) based on PCI data; generating, by the processor, a near PCI list and a far PCI list based on the allocated PCIs and a reference signal received power (RSRP) threshold value; determining, by the processor, cell group IDs and a cell IDs from the near PCI list and the far PCI list; assigning, by the processor, the cell group IDs to a first bin and the cell IDs to a second bin; prioritizing, by the processor, the cell group IDs in the first bin based on effective distance between a near PCI and a far PCI and the cell IDs in the second bin based on an effective RSRP value; and allocating, by the processor, the PCI, to the cell, determined based on the prioritized cell group IDs and the cell IDs.

2 . The method of claim 1 further comprises determining maximum power transmit for the PCI based on a threshold received power and a power hysteresis between reused PCIs.

3 . The method of claim 1 , wherein the PCI data is received from a cell search report of a neighbor cell.

4 . The method of claim 1 , wherein the PCI data comprises a detected PCI list, a cell reuse weightage, a current RSRP threshold value, a PCI count, and maximum and minimum RSRP from neighboring base stations (BTs).

5 . The method of claim 1 , wherein the effective distance between the near PCI and the far PCI is determined based on relative indices (Rel m0 , Rel m1 ) derived from the cell group IDs, and wherein the near PCI is selected from the near PCI list and the far PCI is selected from the far PCI list.

6 . The method of claim 1 , wherein the near PCI list comprises PCIs having RSRP higher than the RSRP threshold value and the far PCI list comprises PCIs having RSRP lower than the RSRP value and non-detected PCIs.

7 . The method of claim 1 , wherein allocating the PCI further comprises:
selecting a cell group ID with highest priority from the first bin; selecting a cell ID with highest priority from the second bin; and determining the PCI, to be allocated to the cell, based on the cell group ID and the cell ID.

8 . A system for allocating a physical cell identifier (PCI) to a cell in a wireless communication network, the system comprising:
a processor operatively coupled to a memory device, wherein the processor is configured to execute instructions stored in the memory device to perform operations comprising: identifying allocated physical cell identifiers (PCIs) based on PCI data; generating a near PCI list and a far PCI list based on the allocated PCIs and a reference signal received power (RSRP) threshold value; determining cell group IDs and a cell IDs from the near PCI list and the far PCI list; assigning the cell group IDs to a first bin and the cell IDs to a second bin; prioritizing the cell group IDs in the first bin based on effective distance between a near PCI and a far PCI and the cell IDs in the second bin based on an effective RSRP value; and allocating the PCI, to the cell, determined based on the prioritized cell group IDs and the cell IDs.

9 . The system of claim 8 , wherein the operations further comprise determining maximum power transmit for the PCI based on a threshold received power and a power hysteresis between reused PCIs.

10 . The system of claim 8 , wherein the PCI data is received from a cell search report of a neighbor cell.

11 . The system of claim 8 , wherein the PCI data comprises a detected PCI list, a cell reuse weightage, a current RSRP threshold value, a PCI count, and maximum and minimum RSRP from neighboring base stations (BTs).

12 . The system of claim 8 , wherein the effective distance between the near PCI and the far PCI is determined based on relative indices derived from the cell group IDs, and wherein and wherein the near PCI is selected from the near PCI list and the far PCI is selected from the far PCI list.

13 . The system of claim 8 , wherein the near PCI list comprises PCIs having RSRP higher than the RSRP threshold value and the far PCI list comprises PCIs having RSRP lower than the RSRP value and non-detected PCIs.

14 . The system of claim 8 , wherein the operations of allocating the PCI further comprise:
selecting a cell group ID with highest priority from the first bin; selecting a cell ID with highest priority from the second bin; and determining the PCI, to be allocated to the cell, based on the cell group ID and the cell ID.

15 . A non-transitory, computer-readable medium storing instructions for allocating a physical cell identifier (PCI) to a cell in a wireless communication network that, when executed by a processor, cause the processor to perform operations comprising:
identifying allocated physical cell identifiers (PCIs) based on PCI data; generating a near PCI list and a far PCI list based on the allocated PCIs and a reference signal received power (RSRP) threshold value; determining cell group IDs and a cell IDs from the near PCI list and the far PCI list; assigning the cell group IDs to a first bin and the cell IDs to a second bin; prioritizing the cell group IDs in the first bin based on effective distance between a near PCI and a far PCI and the cell IDs in the second bin based on an effective RSRP value; and allocating the PCI, to the cell, determined based on the prioritized cell group IDs and the cell IDs.

16 . The computer-readable medium of claim 15 , wherein the operations further comprise wherein the operations further comprise determining maximum power transmit for the PCI based on a threshold received power and a power hysteresis between reused PCIs.

17 . The computer-readable medium of claim 15 , wherein the PCI data is received from a cell search report of a neighbor cell.

18 . The computer-readable medium of claim 15 , wherein the PCI data comprises a detected PCI list, a cell reuse weightage, a current RSRP threshold value, a PCI count, and maximum and minimum RSRP from neighboring base stations (BTs).

19 . The computer-readable medium of claim 15 , the effective distance between the near PCI and the far PCI is determined based on relative indices derived from the cell group IDs, and wherein the near PCI is selected from the near PCI list and the far PCI is selected from the far PCI list.

20 . The computer-readable medium of claim 15 , wherein the near PCI list comprises PCIs having RSRP higher than the RSRP threshold value and the far PCI list comprises PCIs having RSRP lower than the RSRP value and non-detected PCIs.

21 . The computer-readable medium of claim 15 , wherein the operations of allocating the PCI further comprise:
selecting a cell group ID with highest priority from the first bin; selecting a cell ID with highest priority from the second bin; and determining the PCI, to be allocated to the cell, based on the cell group ID and the cell ID.

Assignees

• Wipro Ltd

Inventors

• Chaudhuri Saptarshi
• Manna Avijit
• Pal Shyam Sundar

Classifications

• H04J11/0069 Primary

  Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655) · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W4/80

  Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication · CPC title

• H04W16/12

  Fixed resource partitioning · CPC title