US 9,813,953 B2
Radio network node, a user equipment and methods therein
Wei Zhao, Stockholm (SE); Jingyi Liao, Solna (SE); and Mikael Wittberg, Uppsala (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 14/408,611
Filed by Wei Zhao, Stockholm (SE); Jingyi Liao, Solna (SE); and Mikael Wittberg, Uppsala (SE)
PCT Filed Jul. 4, 2012, PCT No. PCT/SE2012/050775
§ 371(c)(1), (2), (4) Date Dec. 17, 2014,
PCT Pub. No. WO2014/007697, PCT Pub. Date Jan. 9, 2014.
Prior Publication US 2015/0172971 A1, Jun. 18, 2015
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01); H04W 74/08 (2009.01)
CPC H04W 36/0072 (2013.01) [H04W 36/0077 (2013.01); H04W 36/08 (2013.01); H04W 74/0833 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A method, in a radio network node, for handling of changing a primary cell from a first cell to a second cell during re-selection of the primary cell of a user equipment, wherein the radio network node is configured to serve the first cell, wherein the user equipment is located within the first cell and served by the radio network node, wherein the radio network node and the user equipment are comprised in a communications system, the method comprising:
when the radio network node knows that the user equipment is synchronized with the second cell, transmitting an RRCConnectionReconfiguration signal to the user equipment, the RRCConnectionReconfiguration signal comprising an indication that the user equipment does not need to perform a random access procedure for the second cell when changing the primary cell from the first cell to the second cell.