Method of handling device to device communication and related communication device

Patent metadata

Field	Value
Publication number	US-9241365-B2
Application number	US-201314098500-A
Country	US
Kind code	B2
Filing date	Dec 5, 2013
Priority date	Dec 5, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A method of handling device to device communication for a first user equipment (UE) in a wireless communication system includes establishing a Radio Resource Control (RRC) connection to a network of the wireless communication system; performing a proximity-based services (ProSe) communication with a second UE of the wireless communication system; and transmitting a first message to the network when the first UE detects a radio link failure in the ProSe communication; wherein the first message indicates the radio link failure to the network or requests changing to a UE-to-network communication mode from a ProSe communication mode.

First claim

What is claimed is:

1. A method of handling device to device communication for a first user equipment (UE) in a wireless communication system, the method comprising:
establishing a Radio Resource Control (RRC) connection to a network of the wireless communication system;
performing a proximity-based services (ProSe) communication of direct data path type with a second UE of the wireless communication system;
suspending the ProSe communication when a connection failure occurs in the RRC connection with the network;
sending, to the second UE, a first signal indicating the second UE to suspend the ProSe communication when the connection failure occurs in the RRC connection with the network; and
sending, to the second UE, a second signal indicating the second UE to resume the ProSe communication after the first UE resumes the ProSe communication.

2. The method of claim 1 , further comprising:
resuming the ProSe communication when the first UE performs the RRC connection reestablishment procedure successfully or when the first UE receives a first RRC connection reconfiguration message from the network after successful completion of the RRC connection reestablishment procedure.

3. The method of claim 1 , further comprising:
keeping a configuration of the ProSe communication when a radio link failure, a handover failure, a mobility from Evolved Universal Terrestrial Radio Access (E-UTRA) failure, an integrity check failure indication from lower layers, or an RRC connection reconfiguration failure with the network occurs.

4. A first communication device for handling device to device communication in a wireless communication system, comprising:
a processing means; and
a storage unit, for storing a program instructing the processing means to perform a process for handling device to device communication, wherein the process comprises the following steps:
establishing a Radio Resource Control (RRC) connection to a network of the wireless communication system;
performing a proximity-based services (ProSe) communication of direct data path type with a second communication device of the wireless communication system;
suspending the ProSe communication when a connection failure occurs in the RRC connection with the network;
sending, to the second communication device, a first signal indicating the second communication device to suspend the ProSe communication when the connection failure occurs in the RRC connection with the network; and
sending, to the second communication device, a second signal indicating the second communication device to resume the ProSe communication after the first communication device resumes the ProSe communication.

5. The first communication device of claim 4 , wherein the process further comprises:
resuming the ProSe communication when the first communication device performs the RRC connection reestablishment procedure successfully or when the first communication device receives a first RRC connection reconfiguration message from the network after successful completion of the RRC connection reestablishment procedure.

6. The first communication device of claim 4 , wherein the process further comprises:
keeping a configuration of the ProSe communication when a radio link failure, a handover failure, a mobility from Evolved Universal Terrestrial Radio Access (E-UTRA) failure, an integrity check failure indication from lower layers, or an RRC connection reconfiguration failure with the network occurs.

Assignees

• Htc Corp

Inventors

• Wu Chih-Hsiang

Classifications

• H04W76/023

  Electricity · mapped topic

• H04W4/008

  Electricity · mapped topic

• H04W76/043 Primary

  Electricity · mapped topic

• H04W36/00

  Hand-off or reselection arrangements · CPC title

• H04W76/064

  Electricity · mapped topic