Method and apparatus for communication

1. A method for wireless communication, comprising:

generating, by a first mobile device, data to be transmitted to a second mobile device via a first radio link without passing through a base station, the first radio link having a first direction from the first mobile device to the second mobile device;

determining, at the first mobile device, a first monitoring configuration associated with the first radio link in the first direction from the first mobile device to the second mobile device;

transmitting, by the first mobile device, the data to the second mobile device via the first radio link in the first direction from the first mobile device to the second mobile device, the first radio link being monitored based on the first monitoring configuration;

detecting, by the first mobile device, feedback signals in response to the transmission of the data; and

comparing, by the first mobile device, a number of expected feedback signals with a number of detected feedback signals based on the first monitoring configuration.

2. The method of claim 1 , further comprising:

transmitting, from the first mobile device to the second mobile device, a first message that carries the first monitoring configuration to cause the second mobile device to monitor the first radio link.

3. The method of claim 2 , further comprising:

receiving, by the first mobile device, a second message that carries a second monitoring configuration associated with a second radio link in a second direction from the second mobile device to the first mobile device; and

monitoring, by the first mobile device, the second radio link based on the second monitoring configuration.

4. The method of claim 3 , wherein the first message and the second message are messages of a sidelink radio resource control (RRC) protocol.

5. The method of claim 3 , wherein monitoring the second radio link based on the second monitoring configuration further comprises:

evaluating a reception of a control channel in the second radio link.

6. The method of claim 1 , wherein the first monitoring configuration includes at least one of a configuration of reference signals, one or more timer values and one or more threshold values.

7. The method of claim 1 , further comprising:

entering, at the first mobile device, a discontinuous transmission (DTX) mode; and

sending, to the second mobile device, an indicator to suspend the first monitoring configuration associated with the first radio link.

8. The method of claim 1 , further comprising:

declaring, by the first mobile device, a radio link failure of the first radio link when a ratio of the number of detected feedback signals to the number of expected feedback signals is below a threshold.

9. The method of claim 1 , wherein the detecting feedback signals comprises at least one of:

detecting, by the first mobile device, an acknowledgement signal in response to the transmission of the data, the acknowledgement signal indicating a decoding success of the data; and

detecting, by the first mobile device, a negative acknowledgement signal in response to the transmission of the data, the negative acknowledgement signal indicating a decoding failure of the data.

10. An apparatus for wireless communication, comprising:

transmitting circuitry configured to transmit radio signals;

receiving circuitry configured to receive radio signals; and

processing circuitry configured to:

generate data to be transmitted to another apparatus via a first radio link without passing through a base station, the first radio link having a first direction from the apparatus to the other apparatus;

determine a first monitoring configuration associated with the first radio link in the first direction;

transmit, via the transmitting circuitry, the data to the other apparatus via the first radio link in the first direction with the first radio link being monitored based on the first monitoring configuration;

detect feedback signals in response to the transmission of the data; and

compare a number of expected feedback signals with a number of detected feedback signals based on the first monitoring configuration.

11. The apparatus of claim 10 , wherein the first monitoring configuration includes at least one of a configuration of reference signals, one or more timer values and one or more threshold values.

12. The apparatus of claim 10 , wherein the processing circuitry is configured to:

transmit, via the transmitting circuitry, a first message that carries the first monitoring configuration to cause the other apparatus to monitor the first radio link.

13. The apparatus of claim 12 , wherein the processing circuitry is configured to:

receive, via the receiving circuitry, a second message that carries a second monitoring configuration associated with a second radio link in a second direction from the other apparatus to the apparatus; and

monitor the second radio link based on the second monitoring configuration.

14. The apparatus of claim 13 , wherein the first message and the second message are messages of a sidelink radio resource control (RRC) protocol.

15. The apparatus of claim 13 , wherein the processing circuitry is configured to:

evaluate a reception of a control channel in the second radio link based on the second monitoring configuration.

16. The apparatus of claim 10 , wherein the processing circuitry is configured to:

cause the apparatus to enter a discontinuous transmission (DTX) mode; and

send, via the transmitting circuitry, an indicator to suspend the first monitoring configuration associated with the first radio link.

17. The apparatus of claim 10 , wherein the processing circuitry is configured to:

detect at least one of an acknowledgement signal and a negative acknowledgement signal in response to the transmission of the data, the acknowledgement signal indicating a decoding success of the data, the negative acknowledgement signal indicating a decoding failure of the data.

18. The apparatus of claim 10 , wherein the processing circuitry is configured to:

declare a radio link failure of the first radio link when a ratio of the number of detected feedback signals to the number of expected feedback signals is below a threshold.