Uplink Coordinated Inter-Cell Interference Cancellation

• US 20120093093A1
• Filed: 05/21/2008
• Published: 04/19/2012
• Est. Priority Date: 05/21/2008
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Frenger, Pål, Englund, Eva, Gunnarsson, Fredrik, Wiberg, Niclas
• Granted Patent: US 9,008,010 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 92/045 between access point and backbone network device
• CPC Class Codes: H04W 92/20 between access points

Abstract

Device, computer readable medium and method for joint multi-user processing in a first base station of a telecommunication network, which includes at least a second base station and first and second terminals served by the corresponding first and second base stations. The method includes issuing, at the first base station, a first uplink transmission grant for the first terminal; receiving, at the first base station, from the second base station scheduling information about an uplink transmission of the second terminal, wherein an up-link transmission grant for the uplink transmission of the second terminal is issued by the second base station; and jointly decoding, at the first base station, an uplink transmission from the first terminal and the uplink transmission from the second terminal, which is not served by the first base station, based on the received scheduling information about the uplink transmission of the second terminal.

Claims

1. A method for joint multi-user processing in a first base station [32] of a telecommunication network [30], which includes at least a second base station [34] and first and second terminals [10 and 12] served by the corresponding first and second base stations [32 and 34], the method comprising:

issuing, at the first base station [32], a first uplink transmission grant for the first terminal;

receiving, at the first base station [32], from the second base station [34] scheduling information about an uplink transmission of the second terminal [12], wherein an uplink transmission grant for the uplink transmission of the second terminal [12] is issued by the second base station [34]; and

performing, at the first base station [32], joint multi-user decoding of the uplink transmission from the first terminal [10] and the uplink transmission from the second terminal [12], which is not served by the first base station [32], based on the received scheduling information about the uplink transmission of the second terminal [12].

2. The method of claim 1, wherein the joint multi-user processing step further comprises:

decoding, at the first base station, the uplink transmission from the first terminal;

decoding, at the first base station, the uplink transmission from the second terminal; and

cancelling, at the first base station, an interference produced by the uplink transmission of the second terminal to the uplink transmission of the first terminal, based on the decoded uplink transmission of the second terminal.

3. The method of claim 2, wherein the receiving step is performed after the issuing step and prior to the decoding, at the first base station, the uplink transmission from the first terminal.

4. The method of claim 1, further comprising:

instructing the first terminal to detect neighboring base stations that are interfered by a transmission of the first terminal.

5. The method of claim 3, further comprising:

selecting a subset of the interfered base stations, based on measured inter-cell gains of the neighboring base stations.

6. The method of claim 4, further comprising:

informing the subset of the interfered base stations about the uplink transmission from the first terminal.

7. The method of claim 1, further comprising:

instructing the first terminal to detect, only based on a trigger event, neighboring base stations that are interfered by a transmission of the first terminal.

8. The method of claim 1, further comprising:

issuing, at the first base station, a second uplink transmission grant for the first terminal, based on the received scheduling information about the uplink transmission of the second terminal and on the first uplink transmission grant, wherein the first uplink transmission grant is a preliminary grant that is not sent to the first terminal and the second uplink transmission grant is a final grant that is sent to the first terminal.

9. The method of claim 7, wherein the second uplink transmission grant is different from the first uplink transmission grant in at least one of modulation and channel encoding rate but is identical to the first uplink transmission grant for allocated power and frequency.

10. The method of claim 1, further comprising:

issuing, at the first base station, a second uplink transmission grant for the first terminal; and

iteratively distributing scheduling information from the first base station to interfered base stations about the first terminal prior to granting the second uplink transmission grant to the first terminal, wherein the first uplink transmission grant is a preliminary grant and the second uplink transmission grant is a final grant.

11. A first base station [32] configured for joint multi-user processing, the first base station [32] being part of a telecommunication network [30] that includes at least a second base station [34] and first and second terminals [10 and 12] served by the corresponding first and second base stations [32 and 34], the first base station [32] comprising:

a scheduling device [64] configured to issue a first uplink transmission grant for the first terminal [10];

an input device [56] configured to receive from the second base station [34] scheduling information about an uplink transmission of the second terminal [12], wherein an uplink transmission grant for the uplink transmission of the second terminal [12] is issued by the second base station [34]; and

a processor [50] connected to the scheduling device [64] and the input device [56] and configured to jointly decode an uplink transmission from the first terminal [10] and the uplink transmission from the second terminal [12], which is not served by the first base station [32], based on the received scheduling information about the uplink transmission of the second terminal [12].

12. The base station of claim 11, wherein the processor is further configured to decode the uplink transmission from the first terminal, decode the uplink transmission from the second terminal, and cancel an interference produced by the uplink transmission of the second terminal to the uplink transmission of the first terminal, based on the decoded uplink transmission of the second terminal.

13. The base station of claim 12, wherein the input device receives the scheduling information after the scheduling device issues the first uplink transmission grant and prior the processor decodes the uplink transmission from the first terminal.

14. The base station of claim 11, wherein the processor is further configured to:

instruct the first terminal to detect neighboring base stations that are interfered by a transmission of the first terminal.

15. The base station of claim 14, wherein the processor is further configured to:

select a subset of the interfered base stations, based on measured inter-cell gains of the neighboring base stations.

16. The base station of claim 15, wherein the processor is further configured to:

inform the subset of the interfered base stations about the uplink transmission from the first terminal.

17. The base station of claim 11, wherein the processor is further configured to:

instruct the first terminal to detect, only based on a trigger event, neighboring base stations that are interfered by a transmission of the first terminal.

18. The base station of claim 11, wherein the processor is further configured to:

issue a second uplink transmission grant for the first terminal, based on the received scheduling information about the uplink transmission of the second terminal and on the first uplink transmission grant, wherein the first uplink transmission grant is a preliminary grant that is not sent to the first terminal and the second uplink transmission grant is a final grant that is sent to the first terminal.

19. The base station of claim 18, wherein the second uplink transmission grant is different from the first uplink transmission grant in at least one of modulation and channel encoding rate but is identical to the first uplink transmission grant for allocated power and frequency.

20. The base station of claim 11, wherein the scheduling device is further configured to issue a second uplink transmission grant for the first terminal, and the processor is further configured to iteratively distribute scheduling information to interfered base stations about the first terminal prior to granting the second uplink transmission grant to the first terminal, wherein the first uplink transmission grant is a preliminary grant the second uplink transmission grant is a final grant.

21. A first base station [32] configured for joint multi-user processing, the first base station [32] being part of a telecommunication network [30] that includes at least a second base station [34] and first and second terminals [10 and 12] served by the corresponding first and second base stations [32 and 34], the first base station [32] comprising:

means for issuing [64] a first uplink transmission grant for the first terminal;

means for receiving [56] from the second base station [34] scheduling information about an uplink transmission of the second terminal [12], wherein an uplink transmission grant for the uplink transmission of the second terminal [12] is issued by the second base station [34]; and

means for jointly decoding [50] an uplink transmission from the first terminal [10] and the uplink transmission from the second terminal [12], which is not served by the first base station [32], based on the received scheduling information about the uplink transmission of the second terminal [12].

22. A computer readable medium storing computer executable instructions, wherein the instructions, when executed by a processor [50] of a first base station [32] of a telecommunication network [30], which includes at least a second base [34] station and first and second terminals [10 and 12] served by the corresponding first and second base stations [32 and 34], cause the processor [50] to jointly detect multi-users, the instructions comprising:

issuing, at the first base station [32], a first uplink transmission grant for the first terminal [10];

receiving, at the first base station [32], from the second base station [34] scheduling information about an uplink transmission of the second terminal [12], wherein an uplink transmission grant for the uplink transmission of the second terminal [12] is issued by the second base station [34]; and

jointly decoding, at the first base station [32], an uplink transmission from the first terminal [10] and the uplink transmission from the second terminal [12], which is not served by the first base station [32], based on the received scheduling information about the uplink transmission of the second terminal [12].