Uplink interference resolution
An access node in a wireless communication network conducts interference resolution to resolve decoding ambiguities in a received uplink transmission. The access node is assisted by receiving uplink transmission data from another, assisting access node. The received uplink transmission data may include, for example, frequency domain data elements as received by the assisting access node and received and expected reference signals. The access node uses the received uplink transmission data and related local uplink transmission data to estimate channel transfer functions which are then used to estimate and decode the received data. The access node may also improve estimated channel transfer functions by cross-correlation nulling.
1. A method for assisting interference resolution of an uplink transmission by an access node in a wireless communication system, the method comprising:
receiving, at the access node, an uplink transmission from a terminal node and deriving local uplink transmission data associated with the received uplink transmission, the local uplink transmission data including resource demapper output data associated with the uplink transmission;
receiving a request from a second access node for the local uplink transmission data; and
sending the local uplink transmission data to the second access node.
2. The method of claim 1 , further comprising:
discarding, after sending the local uplink transmission data to the second access node, the local uplink transmission data.
3. The method of claim 1 , wherein, in response to an assistance mode indication, the local uplink transmission data includes data associated with at least one resource block that was not scheduled by the access node for uplink transmission.
4. The method of claim 1 , wherein the local uplink transmission data further includes data associated with at least one resource block that was not scheduled by the access node for uplink transmission.
5. The method of claim 1 , wherein the local uplink transmission data further includes data associated with at least one resource block that was scheduled by the access node for uplink transmission.
6. The method of claim 1 , wherein the local uplink transmission data is stored in a memory device of the access node.
7. The method of claim 1 , wherein the local uplink transmission data further includes frequency domain data element values associated with the uplink transmission.
8. The method of claim 1 , wherein the local uplink transmission data further includes reference signal values associated with the uplink transmission.
9. An access node comprising:
a transceiver module configured to receive an uplink transmission;
a memory module; and
a processor module coupled to the transceiver module and the memory module and configured to:
derive local uplink transmission data associated with the received uplink transmission, the local uplink transmission data including resource demapper output data associated with the uplink transmission;
receive a request from a second access node for the local uplink transmission data; and
send the local uplink transmission data to the second access node.
10. The access node of claim 9 , wherein the processor module is further configured to discard, after sending the local uplink transmission data to the second access node, the local uplink transmission data.
11. The access node of claim 9 , wherein, in response to an assistance mode indication, the local uplink transmission data includes data associated with at least one resource block that was not scheduled by the access node for uplink transmission.
12. The access node of claim 9 , wherein the local uplink transmission data further includes data associated with at least one resource block that was not scheduled by the access node for uplink transmission.
13. The access node of claim 9 , wherein the local uplink transmission data further includes data associated with at least one resource block that was scheduled by the access node for uplink transmission.
14. The access node of claim 9 , wherein the local uplink transmission data is stored in the memory module.
15. The access node of claim 9 , wherein the local uplink transmission data further includes frequency domain data element values associated with the uplink transmission.
16. The access node of claim 9 , wherein the local uplink transmission data further includes reference signal values associated with the uplink transmission.