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US 8,588,169 B2Granted
Random access failure in wireless device multiple timing advance groups
AssigneeOfinno Technologies, LLC
InventorEsmael Hejazi Dinan
Life of this patent
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Abstract
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.
Claims15
A method comprising:
- a) repeatedly transmitting, by a wireless device to a base station, a first random access preamble on a primary cell until:
- i) a first random access response corresponding to said first random access preamble is received from said base station;
- or
- ii) a first predetermined number of transmissions is reached;
- b) if said first predetermined number of transmissions is reached without receiving said first random access response:
- i) indicating a random access problem to a radio resource control layer in said wireless device;
- and
- ii) said radio resource control layer determining a radio link failure;
- c) receiving, by said wireless device, at least one control message from said base station, said at least one control message causing in said wireless device:
- i) configuration of a plurality of cells comprising said primary cell and at least one secondary cell, said plurality of cells employed for communication between said wireless device and said base station;
- and
- ii) 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;
- d) receiving, by said wireless device, a MAC activation command causing activation of a first secondary cell in said secondary cell group;
- e) receiving, by said wireless device from said base station and subsequent to receiving said MAC activation command, a control command causing said wireless device to transmit to said base station a second random access preamble on said first secondary cell;
- f) repeatedly transmitting, by said wireless device to said base station, said second random access preamble until:
- i) a second random access response corresponding to said second random access preamble is received from said base station on said primary cell;
- or
- ii) a second predetermined number of transmissions is reached;
- and
- g) if said second predetermined number of transmissions is reached without receiving said second random access response, said wireless device:
- i) stopping transmission of said second random access preamble to said base station;
- and
- ii) keeping a connection with said base station active.
20 more elements
A wireless device comprising:
- a) one or more communication interfaces;
- b) one or more processors;
- and
- c) memory storing instructions that, when executed, cause said wireless device to:
- i) repeatedly transmit a first random access preamble to a base station on a primary cell until:
- (1) a first random access response corresponding to said first random access preamble is received from said base station;
- or
- (2) a first predetermined number of transmissions is reached;
- ii) if said first predetermined number of transmissions is reached without receiving said first random access response:
- (1) indicate a random access problem to a radio resource control layer in said wireless device;
- and
- (2) said radio resource control layer determining a radio link failure;
- iii) receive, from said base station, at least one control message causing:
- (1) configuration of a plurality of cells comprising said primary cell and at least one secondary cell, said plurality of cells employed for communication between said wireless device and said base station;
- and
- (2) 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;
- iv) receive a MAC activation command causing activation of a first secondary cell in said secondary cell group;
- v) receive a control command from said base station, subsequent to receiving said MAC activation command, causing said wireless device to transmit to said base station a second random access preamble on said first secondary cell;
- vi) repeatedly transmit said second random access preamble to said base station until:
- (1) a second random access response corresponding to said second random access preamble is received from said base station on said primary cell;
- or
- (2) a second predetermined number of transmissions is reached;
- and
- vi) if said second predetermined number of transmissions is reached without receiving said second random access response:
- (1) stop transmission of said second random access preamble to said base station;
- and
- (2) keep a connection with said base station active.
24 more elements
Dependencies are inferred from the claim text.