Multiple-input multiple-output (MIMO) with relay nodes

A relay node comprising:

• a processor configured to promote establishing an access link between the relay node and a user agent, the access link based on a first feedback loop that relies on layer 1 signaling of access link feedback information regarding the access link,
• wherein the processor is further configured to promote establishing a relay link between the relay node and an access node, the relay link based on a second closed-feedback loop that relies on higher layer signaling of relay link feedback information regarding the relay link, the higher layer signaling being higher than layer 1 signaling,
• wherein the relay link feedback information is transported less frequently via the relay link as compared to the access link feedback information used on the access link.

A relay node comprising:

• a processor configured to promote establishing an access link between the relay node and a user agent, the access link based on a first feedback loop that relies on layer 1 signaling of access link feedback information regarding the access link,
• wherein the processor is further configured to promote establishing a relay link between the relay node and an access node, the relay link based on a second feedback loop that relies on higher layer signaling of relay link feedback information regarding the relay link, the higher layer signaling being higher than layer 1 signaling,
• wherein the relay link feedback information is transported using the higher layer signaling, and comprises more accurate channel estimation or larger precoding matrices as compared to the access link feedback information that is transported using the layer 1 signaling.

A relay node comprising:

• a processor configured to promote establishing an access link between the relay node and a user agent, the access link based on a first feedback loop that relies on layer 1 signaling of access link feedback information regarding the access link,
• wherein the processor is further configured to promote establishing a relay link between the relay node and an access node, the relay link based on a second feedback loop that relies on higher layer signaling of relay link feedback information regarding the relay link, the higher layer signaling being higher than layer 1 signaling,
• wherein the relay link feedback information is transported using the higher layer signaling, and comprises at least one index table that references more values associated with a precoding matrix indicator (PMI) or channel quality indicator (CQI) as compared to the access link feedback information that is transported using the layer 1 signaling.