the main idea of the present invention is that : when the enb sends a query message to a ue to obtain the ue radio capability information , if the initial context setup request message sent by an mme includes the ie of forbidden inter radio access technologies , the enb only writes radio access technology types , which are not included in the ie of forbidden inter radio access technologies , in the query message , and sends the query message to the ue ; according to the radio access technology types included in the query message , the ue sends the enb the ue radio capability information of radio access technologies supported by the ue itself . compared with the query message in the prior art which includes all the radio access technology types supported by protocol , the enb in the present invention has pertinence when obtaining the ue radio capability information , which reduces the overhead of air interface , thereby shortens the connection delay of the ue . the ue in the present invention may be a mobile phone , a wireless local area network ( wlan ) card , a vehicle - mounted radio station , etc . fig2 illustrates a flowchart of the method for enb to obtain radio capability information of the ue , as shown in fig2 , the method comprises the following steps . step 100 : an mme sends an initial context setup request message to an enb according to an activation request from a ue . in this step , the mme may include a handover restriction related ie , which is called handover restriction list , in the initial context setup request message according to the network configuration of the core network ( cn ); the above ie may further include an ie which is called ie of forbidden inter radio access technologies ( forbidden inter rats ); the ie of forbidden inter radio access technologies includes the types of networks which the mme forbids the ue to be handed over to . the ie of forbidden inter radio access technologies is mainly used for forbidding the ue to be handed over to the network listed by the ie . step 101 : the enb determines whether the initial context setup request message contains ue radio capability information ; when contains , the enb stores the ue radio capability information , and the process of obtaining the ue radio capability information is over ; when no ue radio capability information is contained , executing step 102 . step 102 : the enb determines whether the initial context setup request message contains an ie of forbidden inter radio access technologies ; when contains , executing step 103 ; otherwise , executing step 104 . step 103 : the enb writes radio access technology types , which are not included in the ie of forbidden inter radio access technologies , in a query message , and sends the query message to the ue , then executing step 105 ; in this step , when the initial context setup request message includes a handover restriction list , and the handover restriction list includes the ie of forbidden inter radio access technologies , deleting the radio access technology types included in the ie of forbidden inter radio access technologies from the list of all radio access technologies supported by protocol to obtain a new radio access technology type list ; the query message includes radio access technology type ( rat - type ) field ; the radio access technology types in the obtained new radio access technology type list are written in the rat - type field of the query message . step 104 : the enb writes all radio access technologies supported by protocol in a query message , and sends the query message to the ue , then executing step 105 ; in this step , when the initial context setup request message includes no handover restriction list , or includes a handover restriction list but the handover restriction list includes no ie of forbidden inter radio access technologies , the enb writes all radio access technologies supported by protocol in the rat - type field of the query message . step 105 : after receiving the query message , the ue sends the enb the ue radio capability information of radio access technologies supported by the ue itself according to the radio access technology types in the query message ; in this step , if the ue does not support some radio access technology in the query message , the ue does not organize and send the ue radio capability information of this radio access technology . step 106 : the enb stores the ue radio capability information and sends the ue radio capability information to the mme ; the process of obtaining the ue radio capability information is over . the method for enb to obtain the radio capability information of a mobile phone in lte system is described below with reference to the embodiments . taking an attach process in starting process of a mobile phone as example , in the process , the mme stores no radio capability information of the mobile phone . the mobile phone sends a registration request to the mme ; after receiving the registration request , the mme sends an initial context setup request message to the enb . when the enb determines the initial context setup request message contain no radio capability information of the mobile phone , the enb is triggered to send a query message to the mobile phone to obtain the radio capability information of the mobile phone . the method for the enb to obtain the radio capability information of the mobile phone in the embodiment comprises the following steps . step 1 : after receiving the registration request , the mme sends an initial context setup request message to the enb through an s 1 interface . step 2 : the enb determines whether the initial context setup request message contains the radio capability information of the mobile phone ; when contains , the enb stores the radio capability information of the mobile phone , and the process of obtaining the radio capability information of the mobile phone is over ; otherwise , executing step 3 . step 3 : the enb determines whether the initial context setup request message contains an ie of forbidden inter radio access technologies ; when contains , executing step 4 ; otherwise , executing step 5 . step 4 : the enb writes the radio access technology types , which are not included in the ie of forbidden inter radio access technologies , in a query message , and sends the query message to the mobile phone , and then executing step 6 ; for example , the existing radio access technology types comprise the evolved universal terrestrial radio access ( eutra ) of lte system , the universal terrestrial radio access network of 3g system , the gsm / edge radio access network ( geran ) based on global system for mobile communicates / enhanced data rates for gsm evolution , etc . in ts 36 . 331 , values , corresponding to set { eutra , utran , geran }, in the ie of radio access technology type of the ue radio capability information are { 0 , 1 , 2 }. when the ie of forbidden inter radio access technologies is { geran }, deleting the geran from the protocol - defaulted set of radio access technologies { eutra , utran , geran } to obtain set { eutra , utran }, i . e ., { 0 , 2 }, a new set of radio access technologies , and writing { 0 , 2 } in the rat - type field of the query message . when the ie of forbidden inter radio access technologies is { all }, i . e ., forbidding handover among different networks and just supporting the lte system , deleting the geran and utran from the protocol - defaulted set of radio access technologies { eutra , utran , geran } to obtain a new set { eutra }, and writing the corresponding value { 0 } in the rat - type field of the query message . step 5 : the enb writes all radio access technologies supported by protocol in the query message , and sends the query message to the mobile phone , then executing step 6 ; in this step , the set of radio access technologies { eutra , utran , geran } comprises all radio access technologies supported by protocol ; the enb writes the corresponding values { 0 , 1 , 2 } in the rat - type field of the query message , and sends the query message to the mobile phone through uu interface . step 6 : according to the radio access technologies in the query message , the mobile phone sends the supported radio capability information of the mobile phone to the enb through a uu interface ; in this step , if the mobile phone does not support some radio access technology in the query message , the mobile phone does not organize and send the radio capability information of the mobile phone of the radio access technology . in this embodiment , if mobile phone only supports the eutra technology , the mobile phone would only organizes and writes the eutra radio access technology in the radio capability information of the mobile phone , and then sends the radio capability information of the mobile phone to the enb through the uu interface . step 7 : the enb stores the radio capability information of the mobile phone sent by the mobile phone , and sends the radio capability information to the mme through an 51 interface ; the process of obtaining the radio capability information of the mobile phone is over . taking a common call process of a mobile phone as example , in the starting process of the mobile phone , the mme has stored the radio capability information of the mobile phone . the mobile phone sends a call request to the mme in the process of making a dialing call of the mobile phone ; after receiving the call request , the mme sends an initial context setup request message to the enb . the enb determines the initial context setup request message contains the radio capability information of the mobile phone , and stores the radio capability information of mobile phone . the process of obtaining the radio capability information of the mobile phone is over . if the abnormity of the cn makes the mme lose the radio capability information of the mobile phone at the beginning of call , the initial context setup request message sent from the mme to the enb does not contain the radio capability information of the mobile phone , which triggers the enb to query the mobile phone about the radio capability information of the mobile phone ; the specific query method is the same as that in embodiment 1 . taking a process of registering on internet of a wlan card as example , a user of the wlan card uses a portable computer to perform wireless internet access ; when the user registers through the wlan card , the wlan card also needs to perform an attach process . in the process , the wlan card sends a registration request to the mme ; after receiving the registration request , the mme sends an initial context setup request message to the enb ; if the initial context setup request message does not contain the radio capability information of the wlan card , the enb is triggered to query the wlan card about the radio capability information of the wlan card . the specific query method is the same as that in embodiment 1 . taking a process of registering on internet wirelessly or voice call of a vehicle - mounted radio station as example , when a user of the vehicle - mounted radio station turns on the power to perform user registration , the vehicle - mounted radio station also performs an attach process ; in the attach process or the process of performing voice call by vehicle - mounted radio station , the vehicle - mounted radio station sends a registration request or a call request to the mme ; after receiving the registration request or the call request , the mme sends an initial context setup request message to the enb ; if the initial context setup request message sent from the mme to the enb contains the radio capability information of the vehicle - mounted radio station , the enb stores the radio capability information of the vehicle - mounted radio station , and the process of obtaining the radio capability information of vehicle - mounted radio station is over ; if the initial context setup request message sent from mme to enb does not contain the radio capability information of vehicle - mounted radio station , the enb is triggered to query the vehicle - mounted radio station about the radio capability information of the vehicle - mounted radio station . the specific query method is the same as that in embodiment 1 . the above is only the preferred embodiment of the invention and not intended to limit the scope of protection of the invention .