Massive MIMO cell synchronization: AP to AP indirect communication

1. A method for establishing a channel between an access point (AP) and a contaminating user equipment (UE), the method comprising:

detecting, by an AP, the contaminating UE, wherein the contaminating UE interferes with communication between the AP and other UEs in communication with the AP;

in response to detecting the contaminating UE, transmitting, by the AP, a synchronization message to the contaminating UE on a first channel associated with a data frame, wherein the data frame comprises a downlink (DL) part, an uplink (UL) part, and a header and wherein the first channel is provided on the DL part; and

receiving, by the AP, a second message from the contaminating UE on a second channel, wherein the second channel is identified to the contaminating UE on the UL part of the synchronization message.

2. The method of claim 1 , wherein the first channel enables one-way communication from the AP to the contaminating UE.

3. The method of claim 1 , wherein the first channel and the second channel enable two-way communication between the contaminating UE and the AP.

4. The method of claim 1 , wherein the contaminating UE is connected to a second AP.

5. The method of claim 4 , further comprising communicating from the AP to the second AP via the contaminating UE.

6. The method of claim 5 , wherein the AP and the second AP attempt to simultaneously synchronize via the contaminating UE.

7. The method of claim 4 , wherein the contaminating UE is a clock reference in a cell associated with the second AP or the AP.

8. The method of claim 1 , wherein the synchronization message instructs the contaminating UE to synchronize with the AP.

9. The method of claim 1 , wherein the first channel is provided every certain number of data frames.

10. The method of claim 1 , wherein the first channel is not provided on every data frame.

11. The method of claim 1 , wherein a second UE is connected to the AP, and wherein synchronized communication between the contaminating UE and the AP is based on a direct connection between the second UE and the contaminating UE.

12. The method of claim 1 , wherein when the contaminating UE detects interference on the DL part, the contaminating UE uses the first channel for contacting a second UE, and wherein the AP sanctions a synchronization channel from the AP to the contaminating UE, then to the second UE, and then to a second AP associated with the second UE.

13. The method of claim 1 , wherein the first channel comprises a first dedicated channel.

14. An access point (AP) for establishing a massive multiple-input multiple-output (MIMO) link between the AP and a UE, the AP comprising:

a memory;

a processor;

a module, stored in the memory, executable by the processor, and configured to:

detect a contaminating UE, wherein the contaminating UE interferes with communication between the AP and other UEs in communication with the AP;

in response to detecting the contaminating UE, transmit, from the AP a synchronization message to the contaminating UE on a first channel associated with a data frame, wherein the data frame comprises a downlink (DL) part, an uplink (UL) part, and a header and wherein the channel is provided on the DL part; and

receive, at the AP, a second message from the contaminating UE on a second channel, wherein the second channel is identified to the contaminating UE on the UL part of the synchronization message.

15. The AP of claim 14 , wherein the synchronization message instructs the contaminating UE to synchronize with the AP.

16. The AP of claim 14 , wherein the first channel is provided every certain number of data frames.

17. A computer program product for establishing a massive multiple-input multiple-output (MIMO) link between the AP and a UE, the computer program product comprising a non-transitory computer-readable medium, the non-transitory computer-readable medium comprising:

a first set of codes for causing a computer to detect a contaminating UE, wherein the contaminating UE interferes with communication between the AP and other UEs in communication with the AP;

a second set of codes for causing a computer to, in response to detecting the contaminated UE, transmit a synchronization message to the contaminating UE on a first channel associated with a data frame, wherein the data frame comprises a downlink (DL) part, an uplink (UL) part, and a header and wherein the channel is provided on the DL part; and

a third set of codes for causing a computer to receive a second message from the contaminating UE on a second channel, wherein the second channel is identified to the contaminating UE on the UL part of the synchronization message.