Time alignment timer in multicarrier communications

摘要

A wireless device is configured with a primary cell group and a secondary cell group. When a first time alignment timer of the primary cell group expires, for each cell in the wireless device, the wireless device stops uplink transmission of HARQ feedback, uplink transport blocks, and channel state information. When a second time alignment timer of the secondary cell group expires and the first time alignment timer is running, for each activated cell in the secondary cell group, the wireless device stops transmission of uplink transport blocks, and continues transmission of HARQ feedback and channel state information.

主权项

1. A method, for use in a wireless device, the method comprising:
a) receiving at least one control message from a base station, said at least one control message comprising:
i) configuration parameters of a plurality of cells comprising a primary cell and at least one secondary cell;ii) a cell group index for assignment of a secondary cell in said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising:
(1) a primary cell group comprising a first subset of said plurality of cells, said first subset comprising said primary cell; and(2) a secondary cell group comprising a second subset of said plurality of cells; andiii) configuration parameter of a time alignment timer for each of said plurality of cell groups, said time alignment timer starting or restarting in response to said wireless device receiving a timing advance command to adjust uplink transmission timing of a cell group in said plurality of cell groups, said cell group being one of said primary cell group and said secondary cell group, said cell group considered:
(1) out-of-sync in response to said time alignment timer being expired or not running; and(2) in-sync in response to said time alignment timer running; b) when said primary cell group becomes out-of-sync, for a cell in said primary cell group and said secondary cell group:
i) stopping uplink transmission of Hybrid Automatic Repeat Request (HARQ) positive acknowledgement and negative acknowledgement feedback;ii) stopping re-transmissions of uplink transport blocks in response to downlink HARQ negative acknowledgement feedback;iii) stopping uplink transmissions of transport blocks and channel state information; andiv) allowing uplink transmission of at least one random access preamble if said cell is said primary cell; and c) when said secondary cell group becomes out-of-sync and said primary cell group is in-sync, for each activated cell in said secondary cell group:
i) stopping re-transmission of uplink transport blocks in response to downlink HARQ negative acknowledgement feedback;ii) stopping transmissions of new transport blocks in an uplink of said activated cell;iii) continuing transmission of HARQ positive acknowledgement and negative acknowledgement feedback for transport blocks received on a downlink of said activated cell; andiv) continuing transmission of channel state information for said downlink of said activated cell on an uplink carrier not belonging to said secondary cell group.