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1. (WO2017148674) ADAPTIVE REFERENCE SIGNAL PATTERNS

Pub. No.:    WO/2017/148674    International Application No.:    PCT/EP2017/052869
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: H04L 5/00
Applicants: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
Inventors: FITCH, Michael, Robert
MACKENZIE, Richard, Thomas
Title: ADAPTIVE REFERENCE SIGNAL PATTERNS
Abstract:
A mobile terminal in a wireless communications system estimates channel characteristics (step 53) from transmissions of a base station comprising reference symbols arranged in a first density and distribution. In the event of an impairment in accuracy of channel estimation, the mobile terminal first applies a checking function 55 to determine whether a base station identity conflict is present. If such a conflict is detected, it transmits a report to the base station to initiate a network channel reallocation process 560 to remove the conflict. If no conflict is detected, the base station is instructed (step 56) to initiate a function (57, 58) to change the density and distribution of the reference symbols. This allows a dynamic system to distinguish between different causes of poor channel quality, allowing adaptation of the transmissions of the base stations in a manner appropriate to the cause identified