Configuring base station and wireless device carrier groups

摘要

A base station transmits control message(s) to a wireless device configuring secondary cell(s). Each of the secondary cells is assigned to a cell group in a plurality of cell groups comprising a primary cell group and at least one secondary cell group. The control message(s) comprise dedicated parameters. If dedicated parameters comprise a cell group index for the secondary cell, the wireless device assigns the secondary cell to one of the at least one secondary cell group identified by the cell group index. Otherwise, the wireless device assigns the secondary cell to the primary cell group.

主权项

1. A method comprising:
a) transmitting, by a base station, at least one Radio Resource Control (RRC) message comprising:
i) a cell group index of a secondary cell in at least one secondary cell, said cell group index identifying a secondary cell group in a plurality of cell groups, said plurality of cell groups comprising:
(1) a primary cell group comprising a primary cell, uplink transmissions by a wireless device in said primary cell group employing a first synchronization signal on said primary cell as a primary timing reference; and(2) at least one secondary cell group, each of said at least one secondary cell group comprising a subset of said at least one secondary cell, uplink transmissions in a secondary cell group employing a second synchronization signal on a secondary cell as a secondary timing reference; andii) MAC dedicated parameters comprising a sequence of at least one information element, an information element comprising: a first cell group index of a first secondary cell group and a timer value for a corresponding time alignment timer, said corresponding time alignment timer indicating how long said first secondary cell group is considered to be uplink time aligned; and b) transmitting a MAC timing advance command comprising said first cell group index causing restart of said corresponding time alignment timer.