A method implemented in an Access Point, AP (AP1, AP0, AP2), for maintaining synchronization among APs in a radio access network, the method comprising at least one of the following steps: transmitting a first inter-AP synchronization signal to a first neighboring AP (AP2, AP1), which synchronizes to the AP (AP1, AP0), at a transmission resource indicated by a first synchronization signal transmission/reception pattern associated with the AP (AP1, AP0), when the first neighboring AP (AP2, AP1) receives the first inter-AP synchronization signal at a reception resource indicated by a second synchronization signal transmission/reception pattern associated with the first neighboring AP (AP2, AP1), wherein the reception resource indicated by the second synchronization signal transmission/reception pattern overlaps with the transmission resource indicated by the first synchronization signal transmission/reception pattern; receiving a second inter-AP synchronization signal from a second neighboring AP (AP0, AP1), to which the AP (AP1, AP2) synchronizes, at a reception resource indicated by the first synchronization signal transmission/reception pattern, when the second neighboring AP (AP0, AP1) transmits the second inter-AP synchronization signal at a transmission resource indicated by a third synchronization signal transmission/reception pattern associated with the second neighboring AP (AP0, AP1), wherein the reception resource indicated by the first synchronization signal transmission/reception pattern overlaps with the transmission resource indicated by the third synchronization signal transmission/reception pattern, and characterized in that the method further comprises: a dedicated synchronization signal is used as the first inter-AP synchronization signal, another dedicated synchronization signal is used as the second inter-AP synchronization signal, adjusting a frequency of occurrence of the transmission resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the first neighboring AP and/or a timing difference between the AP and the first neighboring AP, and adjusting a frequency of occurrence of the reception resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the second neighboring AP and/or a timing difference between the AP and the second neighboring AP. transmitting a first inter-AP synchronization signal to a first neighboring AP (AP2, AP1), which synchronizes to the AP (AP1, AP0), at a transmission resource indicated by a first synchronization signal transmission/reception pattern associated with the AP (AP1, AP0), when the first neighboring AP (AP2, AP1) receives the first inter-AP synchronization signal at a reception resource indicated by a second synchronization signal transmission/reception pattern associated with the first neighboring AP (AP2, AP1), wherein the reception resource indicated by the second synchronization signal transmission/reception pattern overlaps with the transmission resource indicated by the first synchronization signal transmission/reception pattern; receiving a second inter-AP synchronization signal from a second neighboring AP (AP0, AP1), to which the AP (AP1, AP2) synchronizes, at a reception resource indicated by the first synchronization signal transmission/reception pattern, when the second neighboring AP (AP0, AP1) transmits the second inter-AP synchronization signal at a transmission resource indicated by a third synchronization signal transmission/reception pattern associated with the second neighboring AP (AP0, AP1), wherein the reception resource indicated by the first synchronization signal transmission/reception pattern overlaps with the transmission resource indicated by the third synchronization signal transmission/reception pattern, and characterized in that the method further comprises: a dedicated synchronization signal is used as the first inter-AP synchronization signal, another dedicated synchronization signal is used as the second inter-AP synchronization signal, adjusting a frequency of occurrence of the transmission resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the first neighboring AP and/or a timing difference between the AP and the first neighboring AP, and adjusting a frequency of occurrence of the reception resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the second neighboring AP and/or a timing difference between the AP and the second neighboring AP. a dedicated synchronization signal is used as the first inter-AP synchronization signal, another dedicated synchronization signal is used as the second inter-AP synchronization signal, adjusting a frequency of occurrence of the transmission resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the first neighboring AP and/or a timing difference between the AP and the first neighboring AP, and adjusting a frequency of occurrence of the reception resource indicated by the first synchronization signal transmission/reception pattern based on a channel condition between the AP and the second neighboring AP and/or a timing difference between the AP and the second neighboring AP.