Interference process of interference signal

Abstract

This invention relates to wireless signal process, and discloses a method for interference process of an interference signal in an OFDM based wireless communication system, comprising: receiving an interference signal; performing time domain and frequency domain analyses on the interference signal to obtain interference characteristics of the interference signal; determining an interference category of the interference signal according to the interference characteristics of the interference signal; and performing interference process on the interference signal in view of the interference category of the interference signal. The method for interference signal process of this invention is effective to both homogeneous network interference and heterogeneous network interference, so that frequency spectrum sharing of homogeneous networks and existing heterogeneous networks can be realized.

What is claimed is: 
     
       1. A method for interference process of an interference signal in an OFDM (Orthogonal Frequency Division Multiplexing) based wireless communication system, comprising:
 receiving an interference signal; 
 performing time domain and frequency domain analyses on the interference signal to obtain interference characteristics of the interference signal; 
 determining an interference category of the interference signal according to the interference characteristics of the interference signal; and 
 performing interference process on the interference signal in view of the interference category of the interference signal, wherein performing interference process on the interference signal in view of the interference category of the interference signal further comprises: 
 in response to determining that the interference category of the interference signal is avoidable interference, generating interference indication information according to frequency occupation of the interference signal in a wireless frequency band; 
 sending the interference indication information to a resource scheduler in an upper layer of its protocol stack; 
 transmitting the interference indication information to a mobile terminal through a downlink control channel; and 
 instructing the mobile terminal to avoid frequencies having interference thereon when the resource scheduler allocates frequencies to the mobile terminal. 
 
     
     
       2. The method according to  claim 1 , further comprising classifying interference categories for interference signals according to interference characteristics in advance. 
     
     
       3. The method according to  claim 2 , wherein the interference categories comprise: resistible interference, avoidable interference, and periodic interference. 
     
     
       4. The method according to  claim 3 , wherein performing interference process on the interference signal in view of the interference category of the interference signal further comprises:
 in response to determining that the interference category of the interference signal is resistible interference, increasing transmission power of a mobile terminal through closed loop power control. 
 
     
     
       5. The method according to  claim 1 , wherein generating interference indication information according to frequency occupation of the interference signal in a wireless frequency band further comprises:
 dividing the wireless frequency band into several subbands; 
 mapping bandwidth of the interference signal to the several subbands; 
 encoding subband occupation of the interference signal in the wireless frequency band to generate interference indication information. 
 
     
     
       6. The method according to  claim 1 , wherein transmitting the interference indication information to the mobile terminal through a downlink control channel further comprises:
 providing the interference indication information in a control word of a downlink frame to be sent to the mobile terminal. 
 
     
     
       7. The method according to  claim 6 , wherein the wireless communication system is a WiMAX system, and the control word of a downlink frame is FCH (Forward Control Header) of a WiMAX downlink frame. 
     
     
       8. The method according to  claim 6 , wherein the wireless communication system is a LET system, wherein the control word of a downlink frame is PDCCH (Physical Downlink Control Channel) of a LTE downlink frame. 
     
     
       9. A method for interference process of an interference signal in an OFDM (Orthogonal Frequency Division Multiplexing) based wireless communication system, comprising:
 receiving an interference signal; 
 performing time domain and frequency domain analyses on the interference signal to obtain interference characteristics of the interference signal; 
 determining an interference category of the interference signal according to the interference characteristics of the interference signal; and 
 performing interference process on the interference signal in view of the interference category of the interference signal, wherein performing interference process on the interference signal in view of the interference category of the interference signal further comprises: 
 in response to determining that the interference category of the interference signal is periodic interference, obtaining a periodic parameter characteristic of the interference signal; 
 according to the periodic parameter characteristic of the interference signal, adopting avoidance measures before the occurrence of the interference signal and restoring the communication state after the disappearance of the interference signal. 
 
     
     
       10. A device for interference process of an interference signal in an OFDM based wireless communication system, comprising:
 a receiving module, configured to receive interference signal; 
 a time-domain and frequency-domain analysis module, configured to perform time domain and frequency domain analyses on the interference signal to obtain interference characteristics of the interference signal; 
 an interference category determination module, configured to determine an interference category of the interference signal according to the interference characteristics of the interference signal; and 
 an interference process module, configured to perform interference process on the interference signal in view of the interference category of the interference signal; 
 wherein the interference process module further comprises an avoidable interference process module or a periodic interference process module; 
 wherein the avoidable interference process module comprises: an interference indication information generating module configured to, in response to determining that the interference category of the interference signal is avoidable interference, generate interference indication information according to frequency occupation of the interference signal in a wireless frequency band; an interference indication information sending module, configured to send the interference indication information to an resource scheduler in an upper layer of its protocol stack, and transmit the interference indication information to a mobile terminal through a downlink control channel; and an interfered frequency avoiding module, configured to cause the resource scheduler to instruct the mobile terminal to avoid frequencies having interference thereon when allocating frequencies to the mobile terminal; and 
 wherein the periodic interference process module is configured to obtain a periodic parameter characteristic of the interference signal in response to determining that the interference category of the interference signal is periodic interference and, according to the periodic parameter characteristic of the interference signal, adopt avoidance measures before the occurrence of the interference signal and restore the communication state after the disappearance of the interference signal. 
 
     
     
       11. The device according to  claim 9 , further comprising an interference category classification module, configured to classify interference categories for interference signals according to interference characteristics in advance. 
     
     
       12. The device according to  claim 11 , wherein the interference categories comprise: resistible interference, avoidable interference, and periodic interference. 
     
     
       13. The device according to  claim 12 , wherein the interference process module further comprises a resistible interference process module, configured to, in response to determining that the interference category of the interference signal is resistible interference, increase transmission power of a mobile terminal through closed loop power control. 
     
     
       14. The device according to  claim 10 , wherein the interference indication information generating module is further configured to:
 divide a wireless frequency band into multiple subbands; 
 map a bandwidth of the interference signal to the multiple subbands; 
 encode subband occupation of the interference signal in the wireless frequency band to generate interference indication information. 
 
     
     
       15. The device according to  claim 10 , wherein the interference indication information sending module is further configured to provide the interference indication information in a control word of a downlink frame sent to the mobile terminal. 
     
     
       16. The device according to  claim 15 , wherein the wireless communication system is a WiMAX system, wherein the control word of a downlink frame is FCH of a WiMAX downlink frame. 
     
     
       17. The device according to  claim 15 , wherein the wireless communication system is a LET system, wherein the control word of a downlink frame is PDCCH of a LTE downlink frame. 
     
     
       18. The method according to  claim 9 , further comprising classifying interference categories for interference signals according to interference characteristics in advance. 
     
     
       19. The method according to  claim 18 , wherein the interference categories comprise: resistible interference, avoidable interference, and periodic interference.