Methods and arrangements in a radio communications system

Details Methods and arrangements in a radio communications system Methods and arrangements in a radio communications system

2004-09-03

2009-11-24

Pham, Chi H. (Department: 2416)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S324000, C370S350000, C370S509000, C370S512000, C370S516000, C455S013200, C455S436000, C375S356000

Reissue Patent

active

RE041000

ABSTRACT:
Methods and an arrangement for synchronizing communication of framed data via asynchronous base stations (BS1,BS2) in a cellular communication system are presented. The synchronization methods are performed continuously by sending out certain system frame counter states from a central node in the system to all its connected base stations (BS1,BS2). Each base station (BS1,BS2) includes a local frame counter (LFCBS1, LFCBS2), which generates local frame counter states (t1(1)-t1(4), t2(1)-t2(4)) correlated to the system frame counter states. Transmission of information via the base stations (BS1,BS2) is synchronized by assigning each data frame (DR(1)-DR(4)) a particular frame number, which is given by the local frame counter states (t1(1)-t1(4), t2(1)-t2(4)), so that data framed (DF(1)-DF (4)) having identical numbers contain copies of a certain data packet. Correct frame numbers are derived from common downlink channel offset measurements (CCO1,CCO2) carried out in the base stations (BS1,BS2), and timing advances values (TA2) and downlink channel offsets (DCO1,DCO2) calculated in the central node.

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