Preamble design for synchronization and cell search
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsAbdulrauf Hafeez, Jiann-Ching Guey
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Abstract
A method of synchronizing signals in a wireless network uses a two part preamble transmitted on the downlink between a base station and a mobile station. The preamble includes a common pilot common to a plurality of base stations and a dedicated pilot unique to the transmitting base station. The mobile station performs coarse synchronization based on the common pilot and fine synchronization based on the dedicated pilot. The mobile station also identifies one or more nearby cells based on unique pilot tones in the dedicated pilot transmitted by the nearby cells.
Claims58
A method of synchronizing signals in a wireless network, the method comprising:
- receiving a signal from a transmitting base station, said signal including a preamble having a common pilot common to a plurality of base stations and a dedicated pilot unique to the transmitting base station;
- performing coarse synchronization based on the common pilot to determine a coarse timing estimate and a coarse frequency offset for the transmitting base station;
- and
- performing fine synchronization based on the dedicated pilot to determine a fine timing estimate for the transmitting base station.
A mobile station in a wireless network for receiving signals from one or more base stations, the mobile station comprising:
- a transceiver to receive a signal from a transmitting base station, wherein said received signal includes a preamble having a common pilot common to a plurality of base stations and a dedicated pilot unique to the transmitting base station;
- and
- a processor configured to:
- determine a coarse timing estimate and a coarse frequency offset for the transmitting base station based on the common pilot;
- and
- determine a fine timing estimate for the transmitting base station based on the dedicated pilot.
A synchronization method for a wireless network, the method comprising:
- transmitting a common pilot as a first part of a preamble transmitted with a signal from a base station to a mobile station in said wireless network, said common pilot common to a plurality of base stations in the wireless network;
- transmitting a dedicated pilot as a second part of said preamble, said dedicated pilot unique to the base station transmitting the signal;
- and
- receiving synchronization data derived by said mobile station based on said transmitted preamble, wherein said synchronization data comprises a fine timing estimate derived from said dedicated pilot, and a coarse timing estimate and a coarse frequency estimate derived from said common pilot.
A base station in a wireless network, the base station comprising:
- a processor configured to generate a preamble for the signal, said preamble comprising a common pilot comprising a symbol common to a plurality of base stations in the wireless network and a dedicated pilot unique to the base station transmitting the signal;
- a transceiver to transmit the preamble with the signal to the mobile station and to receive synchronization data derived by said mobile station based on said transmitted preamble, wherein said synchronization data comprises a fine timing estimate derived from said dedicated pilot, and a coarse timing estimate and a coarse frequency estimate derived from said common pilot.
Dependencies are inferred from the claim text.