Space-time channel sounding in wireless network

An apparatus comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• cause transmission of a request for space-time channel sounding to at least one unassociated access node;
• receive, as a multi-antenna transmission and in response to said request, at least one message comprising space-time sounding information from at least one unassociated access node;
• determine at least one parameter describing space-time channel quality from the received space-time sounding information;
• and
• cause transmission of the at least one determined parameter to an associated access node or cause selection of an unassociated access node for further communication based at least partly on the determined at least one parameter.

A computer program product embodied on a non-transitory distribution medium readable by a computer and comprising program instructions which, when loaded into an apparatus, execute a computer process comprising:

• causing transmission of a request for space-time channel sounding to at least one unassociated access node;
• receiving, as a multi-antenna transmission and in response to said request, at least one message comprising space-time sounding information from at least one unassociated access node;
• determining at least one parameter describing space-time channel quality from the received space-time sounding information;
• and
• causing transmission of the at least one determined parameter to an associated access node or cause selection of an unassociated access node for further communication based at least partly on the determined at least one parameter.