A method performed by a base station - for determining WLAN channel, wherein the base station supports both WLAN access and cellular network access, wherein a first WLAN channel is allocated for its WLAN access, the method comprising: determining whether a frequency space between the first WLAN channel and a frequency range occupied by the cellular network access is not larger than a threshold, and if it is not: selecting a second WLAN channel by the steps of: detecting available WLAN channels which are not occupied by surrounding WLANs, and: determining whether a frequency space between at least one WLAN channel of the available WLAN channels and the frequency range occupied by the cellular network is larger than the threshold, and if it is, selecting one of said at least one WLAN channel as the second WLAN channel; else if a respective frequency space between each of the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, selecting a WLAN channel occupied by one of the surrounding WLANs as the second WLAN channel, wherein a frequency space between the selected WLAN channel occupied by one of the surrounding WLANs and the frequency range occupied by the cellular network access is larger than the threshold; and: changing the WLAN channel of the base station from the first WLAN channel to the second WLAN channel. determining whether a frequency space between the first WLAN channel and a frequency range occupied by the cellular network access is not larger than a threshold, and if it is not: selecting a second WLAN channel by the steps of: detecting available WLAN channels which are not occupied by surrounding WLANs, and: determining whether a frequency space between at least one WLAN channel of the available WLAN channels and the frequency range occupied by the cellular network is larger than the threshold, and if it is, selecting one of said at least one WLAN channel as the second WLAN channel; else if a respective frequency space between each of the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, selecting a WLAN channel occupied by one of the surrounding WLANs as the second WLAN channel, wherein a frequency space between the selected WLAN channel occupied by one of the surrounding WLANs and the frequency range occupied by the cellular network access is larger than the threshold; and: changing the WLAN channel of the base station from the first WLAN channel to the second WLAN channel. selecting a second WLAN channel by the steps of: detecting available WLAN channels which are not occupied by surrounding WLANs, and: determining whether a frequency space between at least one WLAN channel of the available WLAN channels and the frequency range occupied by the cellular network is larger than the threshold, and if it is, selecting one of said at least one WLAN channel as the second WLAN channel; else if a respective frequency space between each of the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, selecting a WLAN channel occupied by one of the surrounding WLANs as the second WLAN channel, wherein a frequency space between the selected WLAN channel occupied by one of the surrounding WLANs and the frequency range occupied by the cellular network access is larger than the threshold; and: changing the WLAN channel of the base station from the first WLAN channel to the second WLAN channel. detecting available WLAN channels which are not occupied by surrounding WLANs, and: determining whether a frequency space between at least one WLAN channel of the available WLAN channels and the frequency range occupied by the cellular network is larger than the threshold, and if it is, selecting one of said at least one WLAN channel as the second WLAN channel; else if a respective frequency space between each of the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, selecting a WLAN channel occupied by one of the surrounding WLANs as the second WLAN channel, wherein a frequency space between the selected WLAN channel occupied by one of the surrounding WLANs and the frequency range occupied by the cellular network access is larger than the threshold; and: determining whether a frequency space between at least one WLAN channel of the available WLAN channels and the frequency range occupied by the cellular network is larger than the threshold, and if it is, selecting one of said at least one WLAN channel as the second WLAN channel; else if a respective frequency space between each of the available WLAN channels and the frequency range occupied by the cellular network is not larger than the threshold, selecting a WLAN channel occupied by one of the surrounding WLANs as the second WLAN channel, wherein a frequency space between the selected WLAN channel occupied by one of the surrounding WLANs and the frequency range occupied by the cellular network access is larger than the threshold; and: changing the WLAN channel of the base station from the first WLAN channel to the second WLAN channel.