Method for Transmitting Control Information

Abstract

The present invention discloses a method for transmitting control information. Downlink control information is categorized into common control information and dedicated control information. A physical broadcast channel is extended by dividing a common control channel domain into a plurality of narrowband sub-control channel domains by adding a position identifier. Before a connection is established, the common control information is sent, according to the position identifier, in each sub-control channel domain of the common control channel domain. After the connection is established, a sub-control channel domain with a channel state that complies with a set standard is selected, according to a channel state of each sub-control channel domain, for sending the dedicated control information.

What is claimed is: 
     
         1 . A method, comprising:
 receiving, by a user terminal according to a preset position identifier, common control information in a sub-control channel domain, wherein a common control channel domain is divided into a plurality of sub-control channel domains, the preset position identifier identifies the sub-control channel domain, and the sub-control channel domain is one of the plurality of sub-control channel domains;   initiating, by the user terminal according to common control information, random access;   after a connection is established with a base station, reporting, by the user terminal to the base station, a channel quality state of each sub-control channel domain of the plurality of sub-control channel domains;   receiving, by the user terminal, a channel instruction from the base station, wherein the channel instruction indicates a selected sub-control channel domain in the plurality of sub-control channel domains; and   listening, by the user terminal according to the channel instruction, to the selected sub-control channel domain.   
     
     
         2 . The method according to  claim 1 , wherein the common control information comprises:
 control information used for scheduling system information (SI), control information used for scheduling a paging message, and control information used for scheduling a random access response message.   
     
     
         3 . The method according to  claim 1 , wherein the channel instruction is received using the selected sub-control channel domain listened to by the user terminal. 
     
     
         4 . The method according to  claim 1 , wherein the channel instruction is received using a default physical downlink control channel (PDCCH). 
     
     
         5 . The method according to  claim 1 , wherein the channel instruction is received using a radio resource control (RRC) message. 
     
     
         6 . A user terminal, comprising:
 a receiver;   a transmitter; and   a processor;   wherein the receiver is configured to receive, according to a preset position identifier, common control information in a sub-control channel domain, wherein a common control channel domain is divided into a plurality of sub-control channel domains, the preset position identifier identifies the sub-control channel domain, and the sub-control channel domain is one of the plurality of sub-control channel domains;   wherein the processor is configured to initiate, according to the common control information, random access;   wherein the transmitter is configured to report, to a base station, a channel quality state of each sub-control channel domain of the plurality of sub-control channel domains after establishing a connection with the base station;   wherein the receiver is further configured to receive a channel instruction from the base station, wherein the channel instruction indicates a selected sub-control channel domain in the plurality of sub-control channel domains; and   wherein the processor is configured to listen, according to the channel instruction, to the selected sub-control channel domain.   
     
     
         7 . The user terminal according to  claim 6 , wherein the common control information comprises:
 control information used for scheduling system information (SI), control information used for scheduling a paging message, and control information used for scheduling a random access response message.   
     
     
         8 . The user terminal according to  claim 6 , wherein the channel instruction is received using the selected sub-control channel domain listened to by the user terminal. 
     
     
         9 . The user terminal according to  claim 6 , wherein the channel instruction is received using a default physical downlink control channel (PDCCH). 
     
     
         10 . The user terminal according to  claim 6 , wherein the channel instruction is received using a radio resource control (RRC) message. 
     
     
         11 . An apparatus, comprising:
 a processor coupled with a non-transitory storage medium storing executable instructions, wherein the executable instructions, when executed by the processor, cause the apparatus to:
 receive, according to a preset position identifier, common control information in a sub-control channel domain, wherein a common control channel domain is divided into a plurality of sub-control channel domains, the preset position identifier identifies the sub-control channel domain, and the sub-control channel domain is one of the plurality of sub-control channel domains; 
 initiate, according to the common control information, random access; 
 after a connection is established with a base station, report, to the base station, a channel quality state of each sub-control channel of the plurality of sub-control channel domains; 
 receive a channel instruction from the base station, wherein the channel instruction indicates a selected sub-control channel domain in the plurality of sub-control channel domains; and 
 listen, according to the channel instruction, to the selected sub-control channel domain. 
   
     
     
         12 . The apparatus according to claim ii, wherein the common control information comprises:
 control information used for scheduling system information (SI), control information used for scheduling a paging message, and control information used for scheduling a random access response message.   
     
     
         13 . The apparatus according to claim ii, wherein the channel instruction is received using the selected sub-control channel domain listened to by the apparatus. 
     
     
         14 . The apparatus according to claim ii, wherein the channel instruction is received using a default physical downlink control channel (PDCCH). 
     
     
         15 . The apparatus according to claim ii, wherein the channel instruction is received using a radio resource control (RRC) message.