Communication Method and Terminal Device

Abstract

A communication method and a terminal device are provided, and whether two terminal devices are in a same network may be recognized. The method includes: receiving, by a first terminal, indication information sent by a second terminal, wherein the indication information is used for indicating information of a network on which the second terminal currently resides; and determining, by the first terminal, whether the first terminal and the second terminal reside on a same network according to the indication information.

What is claimed is: 
     
         1 . A method of device-to-device (D2D) relay communication, comprising:
 receiving, by a first terminal, indication information sent by a second terminal, wherein the indication information is used for indicating information of a network on which the second terminal currently resides; and   determining, by the first terminal, whether the first terminal and the second terminal reside on a same network according to the indication information,   wherein,   receiving, by the first terminal, the indication information sent by the second terminal, comprises:   receiving, by the first terminal, a first message sent by the second terminal, wherein the first message comprises the indication information, and the first message is a discovery message or a direct communication message.   
     
     
         2 . The method of  claim 1 , wherein determining, by the first terminal, whether the first terminal and the second terminal reside on the same network according to the indication information, comprises:
 determining, by the first terminal, that a network on which the first terminal resides is the same as a network on which the second terminal currently resides, according to the indication information.   
     
     
         3 . The method of  claim 2 , wherein the method further comprises:
 communicating, by the first terminal, with the network on which the first terminal and the second terminal currently reside, through the second terminal.   
     
     
         4 . The method of  claim 2 , wherein the method further comprises:
 sending, by the first terminal, a second message to the second terminal, wherein the second message is used for indicating that the networks on which the first terminal and the second terminal currently reside are the same.   
     
     
         5 . The method of  claim 3 , wherein the second message is a discovery message or a direct communication message. 
     
     
         6 . The method of  claim 1 , wherein determining, by the first terminal, whether the first terminal and the second terminal reside on the same network according to the indication information, comprises:
 determining, by the first terminal, that networks on which the first terminal and the second terminal reside are different, according to the indication information.   
     
     
         7 . The method of  claim 6 , wherein after determining, by the first terminal, that the networks on which the first terminal and the second terminal reside are different, according to the indication information, the method further comprises:
 receiving, by the first terminal, indication information sent by other terminals, wherein the indication information is used for indicating information of networks on which the other terminals currently reside; and   finding, by the first terminal, a terminal device on the same network as the first terminal according to the indication information sent by the other terminals.   
     
     
         8 . The method of  claim 6 , wherein the method further comprises:
 performing, by the first terminal, a residing action, wherein the residing action is used for making the first terminal reside on the network on which the second terminal currently resides.   
     
     
         9 . The method of  claim 8 , wherein the method further comprises:
 communicating, by the first terminal, with the network on which the second terminal currently resides, through the second terminal, under a situation that the first terminal performs the residing action successfully.   
     
     
         10 . The method of  claim 8 , wherein the method further comprises:
 sending, by the first terminal, a third message to the second terminal, wherein the third message is used for indicating that the first terminal has successfully resided on the network on which the second terminal currently resides.   
     
     
         11 . The method of  claim 10 , wherein the third message is a discovery message or a direct communication message. 
     
     
         12 . The method of  claim 8 , wherein the method further comprises:
 sending, by the first terminal, a fourth message to the second terminal, wherein the fourth message is used for indicating that the first terminal fails in performing the residing action.   
     
     
         13 . The method of  claim 12 , wherein the fourth message comprises a failure reason and/or information of a network on which the first terminal currently resides, wherein the failure reason comprises at least one of the following:
 a channel quality of the network on which the second terminal currently resides does not meet a preset condition, and the network on which the second terminal currently resides does not allow the first terminal to access.   
     
     
         14 . The method of  claim 5 , wherein the method further comprises:
 sending, by the first terminal, a fifth message to the second terminal, wherein the fifth message is used for rejecting to reside on the network on which the second terminal currently resides.   
     
     
         15 . The method of  claim 14 , wherein the fifth message further comprises a rejection reason and/or information of a network on which the first terminal resides, wherein the rejection reason comprises that networks on which the first terminal and the second terminal currently reside are different. 
     
     
         16 . The method of  claim 6 , wherein the method further comprises:
 sending, by the first terminal, a sixth message to the second terminal, wherein the sixth message is used for rejecting the first message.   
     
     
         17 . The method of  claim 16 , wherein the sixth message comprises a rejection reason, wherein the rejection reason comprises that networks on which the first terminal and the second terminal currently reside are different. 
     
     
         18 . A terminal device, comprising:
 a transceiver, used for receiving indication information sent by a second terminal, wherein the indication information is used for indicating information of a network on which the second terminal currently resides; and   a processor, used for determining whether the terminal device and the second terminal reside on a same network according to the indication information,   wherein the transceiver is further used for:   receiving a first message sent by the second terminal, wherein the first message comprises the indication information, and the first message is a discovery message or a direct communication message.   
     
     
         19 . The terminal device of  claim 18 , wherein the same network is any one of the following: a same beam, a cell, a base station, a core network, a Public Land Mobile Network (PLMN), a Tracking Area (TA), or a paging area. 
     
     
         20 . The terminal device of  claim 18 , wherein the transceiver is further used for: receiving the indication information sent by the second terminal, under a situation that the second terminal is powered on, or the resided network changes, or there is a relay service to be transmitted.