Measurement-based random access configuration

1. A method for a device to communicate with one or more transmission points (TPs), comprising:

receiving a plurality of synchronization signals;

performing a plurality of measurements on the plurality of synchronization signals;

selecting a first synchronization signal with a measurement result above a threshold from the plurality of synchronization signals based on the plurality of measurements;

receiving a signal that includes configuration information indicating a mapping between a set of allowed random access resources and the first synchronization signal;

selecting a random access resource from the set of allowed random access resources based on the mapping; and

transmitting a random access signal on the selected random access resource to at least one of the one or more TPs.

2. The method of claim 1 , further comprising:

receiving a system information containing a configuration of the plurality of synchronization signals,

wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals.

3. The method of claim 1 , wherein:

each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and

the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index.

4. The method of claim 1 , wherein:

the plurality of synchronization signals are received periodically in bursts; and

a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts.

5. The method of claim 4 , further comprising:

receiving a burst that comprises both a system information and a measurement reference signal (RS);

determining a presence of the system information based on a presence of the measurement RS on the burst; and

demodulating the system information based on the measurement RS.

6. A method for one or more transmission points (TPs) to communicate with a device, comprising:

transmitting a plurality of synchronization signals to the device, wherein the plurality of synchronization signals are configured for the device to perform a plurality of measurements;

sending a signal that includes configuration information indicating a mapping between a set of allowed random access resources and a first synchronization signal from the plurality of synchronization signals, wherein the first synchronization signal corresponds to a measurement result obtained from the plurality of measurements and the measurement result is above a threshold; and

receiving a random access signal from the device on a random access resource selected based on the mapping, by the device, from the set of allowed random access resources.

7. The method of claim 6 , further comprising:

sending a system information containing a configuration of the plurality of synchronization signals,

wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals.

8. The method of claim 6 , wherein:

each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and

the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index.

9. The method of claim 6 , wherein:

the plurality of synchronization signals are transmitted periodically in bursts; and

a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts.

10. The method of claim 9 , further comprising:

sending a burst that comprises both a system information and a measurement reference signal (RS) to the device,

wherein the measurement RS is configured for the device to demodulate the system information.

11. A device, comprising:

a receiver configured to receive a plurality of synchronization signals;

at least one processor configured to:

perform a plurality of measurements on the plurality of synchronization signals, and

select a first synchronization signal with a measurement result above a threshold from the plurality of synchronization signals based on the plurality of measurements,

wherein the receiver is further configured to receive a signal that includes configuration information indicating a mapping between a set of allowed random access resources and the first synchronization signal,

wherein the at least one processor is further configured to select a random access resource from the set of allowed random access resources based on the mapping; and

a transmitter configured to transmit a random access signal on the selected random access resource to at least one of the one or more TPs.

12. The device of claim 11 , wherein the receiver is further configured to:

receive a system information containing a configuration of the plurality of synchronization signals,

wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals.

13. The device of claim 11 , wherein:

each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and

the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index.

14. The device of claim 11 , wherein:

the plurality of synchronization signals are received periodically in bursts; and

a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts.

15. The device of claim 14 , wherein:

the receiver is further configured to receive a burst that comprises both a system information and a measurement reference signal (RS); and

the at least one processor is further configured to:

determine a presence of the system information based on a presence of the measurement RS on the burst, and

demodulate the system information based on the measurement RS.

16. A transmission point (TP), comprising:

a transceiver configured to:

transmit a plurality of synchronization signals to a device, wherein the plurality of synchronization signals are configured for the device to perform a plurality of measurements,

send a signal that includes configuration information indicating a mapping between a set of allowed random access resources and a first synchronization signal from the plurality of synchronization signals, wherein the first synchronization signal corresponds to a measurement result obtained from the plurality of measurements and the measurement result is above a threshold, and

receive a random access signal from the device on a random access resource selected based on the mapping, by the device, from the set of allowed random access resources.

17. The TP of claim 16 , wherein the transceiver is further configured to:

send a system information containing a configuration of the plurality of synchronization signals,

wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals.

18. The TP of claim 16 , wherein:

each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and

the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index.

19. The TP of claim 16 , wherein:

the plurality of synchronization signals are transmitted periodically in bursts; and

a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts.

20. The TP of claim 19 , wherein the transceiver is further configured to:

send a burst that comprises both a system information and a measurement reference signal (RS) to the device,

wherein the measurement RS is configured for the device to demodulate the system information.