Asa assistance-based interference coordination method in heterogeneous tdd relay network

An ASA assistance-based interference coordination method in a heterogeneous TDD relay network, which is used in a scenario with coexisting of an ASA assistance-based TD-LTE network and a TDD primary user network, the heterogeneous TDD relay network comprising two usable carrier frequencies, one of which is an LTE carrier frequency f0 and the other of which is an ASA carrier frequency f1, the carrier frequency f1 is a central frequency point of a primary cell and the ASA carrier frequency f1 is a central frequency point of a secondary cell, wherein, the method comprises following steps:

• Step 1, a primary base station sending a request message to an ASA controller to request for leaving ASA spectrum users in a protection region, when a primary user requests for use of the ASA carrier frequency f1;
• Step 2, the ASA controller sending an ASA control message to an OAM after the ASA controller receives the request from the primary system;
• Step 3, after the OAM receives the ASA control message, an MME being inquired according to a new protection region in the ASA control message or the interference region message, and the ASA control message being sent to the MME to adjust the coverage of a macro base station in a region possibly interfering to the primary system, the region possibly interfering to the primary system belonging to the MME;
• Step 4, the MME calculating and informing related macro base stations to adjust wireless resource control according to a new interference region, and sending frame configuration information and synchronous information of the primary system to the related macro base stations;
• Step 5, the macro base station adjusting the wireless resource control and reducing coverage of the secondary cell on the ASA carrier frequency f1 to avoid the interference to a primary system cell;
• and
• the macro base station finding an RUE close to the protection region of the primary system and possibly interfering to the primary users, adjusting a frame structure of a relay node to which the RUE belongs, and updating synchronous information;
• Step 6, the macro base station sending new frame configuration information and synchronous information to the relay node;
• Step 7, the macro base station reporting new coverage of subordinate base stations and/or coverage of the relay node and a work mode;
• and
• Step 8, the ASA controller periodically sending frame configuration and the synchronous information of the primary system to the OAM.