Random access failure in wireless device multiple timing advance groups

摘要

A wireless device receives a control command to transmit a random access preamble on a first secondary cell. The wireless device repeatedly transmits the random access preamble until a random access response corresponding to the random access preamble is received or a predetermined number of transmissions is reached. If the predetermined number of transmissions is reached without receiving the random access response, the wireless device stops transmission of the random access preamble and keeps a connection with the base station active.

主权项

1. A method for use in a wireless device, the method comprising:
a) receiving from a base station at least one control message causing in said wireless device:
i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell, said plurality of cells employed for communication between said wireless device and said base station; andii) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising a secondary cell group comprising a subset of said at least one secondary cell; b) receiving a MAC activation command causing activation of a first secondary cell in said secondary cell group; c) receiving from said base station and subsequent to receiving said MAC activation command, a control command causing said wireless device to transmit a random access preamble on said first secondary cell; d) repeatedly transmitting said random access preamble on said first secondary cell until:
i) a random access response corresponding to said random access preamble is received on said primary cell, otherwiseii) a predetermined number of transmissions is reached; and e) if said predetermined number of transmissions is reached without receiving said random access response, said wireless device:
i) stopping transmission of said random access preamble; andii) keeping a preexisting connection with said base station active.