Patent ID: 9432847
Filing Date: 2016-08-30
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method of processing a signal by a relay node in a wireless communication system, the method comprising: transmitting, by the relay node to a network, a first message associated with a connection reestablishment, wherein the first message includes an indicator indicating a connection reestablishment cause; receiving, by the relay node, a second message associated with the connection reestablishment; when the indicator indicates integrity failure on an acknowledged mode (AM) data radio bearer (DRB) as the connection establishment cause, resetting, by the relay node, a value of at least one packet data convergence protocol (PDCP) state variable associated with the AM DRB to a predetermined value according to the second message for consistency of the value of the at least one PDCP state variable between the relay node and the network, wherein the second message includes a command for resetting the at least one PDCP state variable associated with the AM DRB; and when the indicator indicates connection reestablishment cause other than the integrity failure on the AM DRB, maintaining the value of the at least one PDCP state variable, wherein the AM DRB is used for carrying at least control information from the network.