Cell search method of terminal and related device and system

Abstract

A cell search method of a terminal is provided. The terminal includes first and second network units. The first network unit camps a CS domain on a first network preferentially, and executes a CS domain service; the second network unit camps a PS domain on a second network preferentially, and executes a PS domain service; the first network unit receives a system message from a cell of the first network where the first network unit is located, and determines whether the system message carries neighboring cell information of the second network of the cell; and the second network unit searches for a cell of the second network after the first network unit determines that the system message carries the neighboring cell information of the second network of the cell. With the solutions, subscriber experience can be improved and cell search time of the terminal can be reduced.

What is claimed is: 
     
         1 . A cell search method of a terminal, wherein the terminal supporting camping on at least two networks simultaneously, a circuit switching (CS) domain is preferentially camped on the first network, and a packet switching (PS) domain is preferentially camped on the second network; and the method comprising:
 receiving a system message from a cell of the first network;   determining whether the system message carries neighboring cell information of the second network of the cell; and   searching for a cell of the second network after it is determined that the system message carries the neighboring cell information of the second network of the cell,   wherein signal coverage of the first network is better than that of the second network, and a data transmission rate of the second network is higher than that of the first network.   
     
     
         2 . The method according to  claim 1 , further comprising:
 sending a second network cell search indication that comprises the neighboring cell information of the second network to the second network unit after it is determined that the system message carries the neighboring cell information of the second network of the cell; and   searching for the cell of the second network according to the neighboring cell information of the second network after receiving the second network cell search indication that comprises the neighboring cell information of the second network.   
     
     
         3 . The method according to  claim 2 , wherein searching for the cell of the second network according to the neighboring cell information of the second network comprises:
 if the first network is reselected for a service of the second network, searching for the cell of the second network according to the neighboring cell information of the second network; or   if the terminal does not camp on any cell of the second network, searching for the cell of the second network according to the neighboring cell information of the second network.   
     
     
         4 . The method according to  claim 1 , further comprising:
 searching for the cell of the second network in all frequency bands or not searching for the cell of the second network after it is determined that the system message does not carry the neighboring cell information of the second network of the cell.   
     
     
         5 . The method according to  claim 1 , wherein the first network and the second network are of different generations. 
     
     
         6 . The method according to  claim 1 , wherein the system message is a message that carries a cell identity of the first cell, and other neighboring cell information of the network to which the first cell belongs. 
     
     
         7 . A terminal, wherein the terminal supporting camping on at least two networks, and the terminal comprises: a first processor with a first antenna, a second processor with a second antenna, and a single card;
 wherein the terminal supports camping on a first network by the first processor with the first antenna and a second network by the second processor with the second antenna simultaneously, a circuit switching (CS) domain is preferentially camped on the first network, and a packet switching (PS) domain is preferentially camped on the second network, wherein signal coverage of the first network is better than that of the second network, and a data transmission rate of the second network is higher than that of the first network;   the first processor is further configured to:   receive a system message from a cell of the first network;   and determine whether the system message carries information of a neighboring cell, wherein the neighboring cell is located in the second network and is neighboring to the cell in the first network;   the second processor is configured to search for a cell of the second network when the first processor determines the system message carries the information of the neighboring cell; and   the single card is configured to store first information of a subscriber in the first network and second information of the subscriber in the second network.   
     
     
         8 . The terminal according to  claim 7 , wherein:
 the second processor is configured to search for the cell of the second network if the first network is reselected for a service of the second processor.   
     
     
         9 . The terminal according to  claim 7 , wherein:
 the first processor performs instructing the second processor to search for the neighboring cell after it is determined that the system message carries information of the neighboring cell.   
     
     
         10 . The terminal according to  claim 9 , wherein:
 the first processor performs sending an indication for searching for the neighboring cell to the second processor, wherein the indication carries the information of the neighboring cell.   
     
     
         11 . The terminal according to  claim 7 , wherein:
 the second processor preferentially performs camping the PS domain on the second network through a PS attach procedure.   
     
     
         12 . The terminal according to  claim 7 , wherein:
 the first processor preferentially further performs camping the CS domain on the first network through a CS attach procedure.   
     
     
         13 . The terminal according to  claim 7 , wherein:
 the first processor and the second processor are configured with independent antennas.   
     
     
         14 . The terminal according to  claim 7 , further comprising: an agent connected to the single card, wherein
 the first processor obtains the first information from the single card via the agent; and   the second processor obtains the second information from the single card via the agent.   
     
     
         15 . The terminal according to  claim 7 , wherein the first network and the second network are of different generations. 
     
     
         16 . The terminal according to  claim 7 , wherein the system message is a message that carries a cell identity of the first cell, and other neighboring cell information of the network to which the first cell belongs. 
     
     
         17 . The terminal according to  claim 7 , wherein the terminal is a single-card dual-standby terminal. 
     
     
         18 . A non-transitory computer-readable medium comprising instructions that, when executed, cause an apparatus to:
 receive a system message from a cell of a first network;   determine whether the system message carries neighboring cell information of a second network of the cell; and   search for a cell of the second network after it is determined that the system message carries the neighboring cell information of the second network of the cell,   wherein signal coverage of the first network is better than that of the second network, a data transmission rate of the second network is higher than that of the first network, a circuit switching (CS) domain is preferentially camped on the first network, and a packet switching (PS) domain is preferentially camped on the second network.