Patent ID: 7336638
Filing Date: 2008-02-26
Classification: H04W

Abstract:
1. A method for maintaining uplink synchronization in P 2 P (Peer to Peer) communication performed by user equipment (UE) in wireless communication systems, comprising: (a) negotiating with a UTRAN (Universal mobile telecommunications system Terrestrial Radio Access Network) of a wireless communication network system to determine a schedule and parameters for controlling the uplink synchronization for the user equipment, during a procedure of establishing a P (b) transmitting testing signals from the UE to the UTRAN of the network system via a customized uplink channel according to the negotiated schedule and parameters, wherein the negotiated schedule and parameters include at least (i) an interval corresponding to an intermittent and regular interval for sending testing signals from the UE to the UTRAN for executing unlink synchronization estimation and control, and (ii) a number corresponding to a number of continuous traffic bursts to be included in the testing signals and used for the unlink synchronization estimation and control; (c) receiving control information transmitted via a customized downlink channel from the UTRAN of the network system according to the negotiated schedule; and (d) maintaining uplink synchronization for the user equipment with the UTRAN during P