Method for cancelling a data transmission of a neighboring cell
A method of interference cancellation is proposed. A UE obtains configuration information of a data transmission from a neighboring cell via an interference channel in a mobile communication network. The UE receives radio signals on a set of data resource elements as determined based on the obtained configuration information. The UE then estimates the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of data resource elements. Finally, the UE cancels the data transmission from the neighboring cell based on the estimated interference channel.
1. A method, comprising:
(a) obtaining configuration information of a data transmission by a user equipment (UE) in a mobile communication network, wherein the data transmission is transmitted from a neighboring cell to the UE via an interference channel;
(b) receiving radio signals on a set of resource elements (REs) as determined based on the obtained configuration information;
(c) estimating the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of resource elements; and
(d) cancelling the data transmission from the neighboring cell based on the estimated interference channel.
2. The method of claim 1 , wherein the configuration information includes a specific transmission mode or a subset of transmission modes used by the neighboring cell for the data transmission.
3. The method of claim 1 , wherein the configuration information includes a resource allocation type used by the neighboring cell for the data transmission.
4. The method of claim 3 , wherein the resource allocation type includes a type 0 or type 1 of LTE downlink resource allocation.
5. The method of claim 1 , wherein the configuration information includes a basic unit of physical resource blocks (PRBs) used by the neighboring cell for the data transmission.
6. The method of claim 5 , wherein the UE estimates the interference channel by applying the same transmission parameters for the basic unit of PRBs.
7. The method of claim 1 , wherein the configuration information includes a basic unit of consecutive physical resource blocks (PRBs) used by the neighboring cell for the data transmission using a localized type of virtual resource block (LVRB).
8. The method of claim 1 , wherein the configuration information includes an indication of a localized type of virtual resource block (LVRB).
9. The method of claim 1 , wherein the configuration information includes an indication of a distributed type of virtual resource block (DVRB).
10. The method of claim 9 , wherein the configuration information further includes a system bandwidth and a gap value used to map the DVRB to a physical resource block (PRB) index.
11. The method of claim 1 , wherein the existence of the configuration information indicates that the neighboring cell and the serving cell are synchronized.
12. The method of claim 1 , wherein the UE cancels the data transmission in (d) based on the configuration information obtained in (a).
13. A method, comprising:
(a) obtaining configuration information of a data transmission by a user equipment (UE) in a mobile communication network, wherein the data transmission is transmitted from a neighboring cell to the UE via an interference channel;
(b) receiving radio signals on a set of resource elements (REs) as determined based on the configuration information, wherein the receiving of the radio signals involves; determining a location of the set of REs based on resource allocation information derived from the configuration information;
(c) estimating the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of resource elements; and
(d) cancelling the data transmission from the neighboring cell based on the estimated interference channel.
14. The method of claim 13 , wherein the location of the set of REs corresponds to reference signal transmissions of the serving cell.
15. The method of claim 13 , wherein the location of the set of REs corresponds to data transmissions of the serving cell.
16. A method, comprising:
(a) obtaining configuration information of a data transmission by a user equipment (UE) in a mobile communication network, wherein the data transmission is transmitted from a neighboring cell to the UE via an interference channel;
(b) receiving radio signals on a set of resource elements (REs) as determined based on the obtained configuration information;
(c) estimating the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of resource elements; and
(d) cancelling the data transmission from the neighboring cell based on the estimated interference channel, wherein (c) further involves:
estimating a desired signal corresponding to a reference signal transmitted from the serving cell; and
subtracting from the received signals the estimated desired signal and thereby estimating the interference channel.
17. A user equipment (UE), comprising:
a configuration module that obtains configuration information of a data transmission in a mobile communication network, wherein the data transmission is transmitted from a neighboring cell to the UE via an interference channel;
a receiver that receives radio signals on a set of resource elements (REs) as determined based on the obtained configuration information;
a channel estimation module that estimates the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of data resource elements; and
an interference cancellation module that cancels the data transmission from the neighboring cell based on the estimated interference channel.
18. The UE of claim 17 , wherein the configuration information includes a resource allocation type used by the neighboring cell for the data transmission.
19. The UE of claim 18 , wherein the resource allocation type includes a type 0 or type 1 of LTE downlink resource allocation.
20. The UE of claim 17 , wherein the configuration information includes a basic unit of physical resource blocks (PRBs) used by the neighboring cell for the data transmission.
21. The UE of claim 20 , wherein the UE estimates the interference channel by applying the same transmission parameters for the basic unit of PRBs.
22. The UE of claim 17 , wherein the configuration information includes a basic unit of consecutive physical resource blocks (PRBs) used by the neighboring cell for the data transmission using a localized type of virtual resource block (LVRB).
23. The UE of claim 17 , wherein the UE estimates a desired signal corresponding to a reference signal transmitted from the serving cell and then subtracts from the received signals the estimated desired signal to estimate the interference channel.
24. A user equipment (UE), comprising:
a configuration module that obtains configuration information of a data transmission in a mobile communication network, wherein the data transmission is transmitted from a neighboring cell to the UE via an interfering channel;
a receiver that receives radio signals on a set of resource elements (REs) as determined based on the obtained configuration information;
a channel estimation module that estimates the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of data resource elements; and
an interference cancellation module that cancels the data transmission from the neighboring cell based on the estimated interference channel, wherein the UE determines the location of the set of REs based on resource allocation information derived from the configuration information.