A method for a first wireless device, the method comprising: determining an intended pilot sequence that the first wireless device intends to send to an access node; determining (110; 112-116; 218) whether another wireless device (10B; 10N) is using a similar pilot sequence; wherein the similar pilot sequence is a pilot sequence that creates more than a pre-determined amount of interference for the intended pilot sequence; transmitting (120; 122; 124; 126) the intended pilot sequence or a different pilot sequence to the access node, wherein: in response to a determination that another wireless device (10B; 10N) is not using the similar pilot sequence, the intended pilot sequence is transmitted in a next available time instance; and in response to a determination that another wireless device (10B; 10N) is using the similar pilot sequence, the intended pilot sequence is not transmitted (124; 126) in the next available time instance; wherein determining (110; 112-116; 218) whether another wireless device (10B; 10N) is using the similar pilot sequence comprises: monitoring one or more channels that other wireless devices (10B; 10N) use for transmitting pilot sequences; detecting the pilot sequences used by the other wireless devices (10B; 10N); and determining whether any of the detected pilot sequences match the similar pilot sequence; wherein the monitoring is performed in response to receiving (218; 220) information from the access node, the information indicating that the similar pilot sequence is among a set of one or more pilot sequences that are potentially being used by other wireless devices (10B; 10N). determining an intended pilot sequence that the first wireless device intends to send to an access node; determining (110; 112-116; 218) whether another wireless device (10B; 10N) is using a similar pilot sequence; wherein the similar pilot sequence is a pilot sequence that creates more than a pre-determined amount of interference for the intended pilot sequence; transmitting (120; 122; 124; 126) the intended pilot sequence or a different pilot sequence to the access node, wherein: in response to a determination that another wireless device (10B; 10N) is not using the similar pilot sequence, the intended pilot sequence is transmitted in a next available time instance; and in response to a determination that another wireless device (10B; 10N) is using the similar pilot sequence, the intended pilot sequence is not transmitted (124; 126) in the next available time instance; in response to a determination that another wireless device (10B; 10N) is not using the similar pilot sequence, the intended pilot sequence is transmitted in a next available time instance; and in response to a determination that another wireless device (10B; 10N) is using the similar pilot sequence, the intended pilot sequence is not transmitted (124; 126) in the next available time instance; wherein determining (110; 112-116; 218) whether another wireless device (10B; 10N) is using the similar pilot sequence comprises: monitoring one or more channels that other wireless devices (10B; 10N) use for transmitting pilot sequences; detecting the pilot sequences used by the other wireless devices (10B; 10N); and determining whether any of the detected pilot sequences match the similar pilot sequence; monitoring one or more channels that other wireless devices (10B; 10N) use for transmitting pilot sequences; detecting the pilot sequences used by the other wireless devices (10B; 10N); and determining whether any of the detected pilot sequences match the similar pilot sequence; wherein the monitoring is performed in response to receiving (218; 220) information from the access node, the information indicating that the similar pilot sequence is among a set of one or more pilot sequences that are potentially being used by other wireless devices (10B; 10N).