CPC H04W 74/008 (2013.01) [H04B 7/0408 (2013.01); H04B 7/0617 (2013.01); H04B 7/086 (2013.01); H04L 5/0048 (2013.01); H04W 16/28 (2013.01); H04W 72/046 (2013.01)] | 21 Claims |
1. A method in a wireless device for performing random access to a network node, the method comprising:
receiving a set of downlink beam-specific reference signals (BRSs) from the network node;
determining a preferred BRS based on the received signal power for each BRS in the set; and
selecting, based on the preferred BRS, a random-access preamble for transmitting a random-access attempt to the network node according to one or more pre-defined association rules defining an association between a random-access resource and a BRS, the selecting using a function that uses the preferred BRS as an input and provides the selected random-access preamble as an output, the function being specified in a standard; and
transmitting the selected random-access preamble to the network node, whereby the selection of the random-access preamble indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions.
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