Granted Patent B2

US 12,395,871 · App. 17/758,349 · Granted Aug 19, 2025

Inventors: Jose Flordelis (Lund, SE); Fredrik Rusek (Eslöv, SE); Olof Zander (Södra Sandby, SE); Kun Zhao (Malmö, SE); Erik Bengtsson (Eslöv, SE)

Assignee: Sony Group Corporation

H04W24/08H04L5/0051H04L5/14H04W74/0841

Abstract

Claims (41)

1. A method of operating a wireless communication device configured to communicate with a communications network using frequency duplex transmission in an uplink frequency band and in a downlink frequency band, the method comprising:

monitoring for first downlink reference signals transmitted by an access node of the communications network in the uplink frequency band and using multiple first downlink transmit beams, and

monitoring for second downlink reference signals transmitted by the access node of the communications network in the downlink frequency band and using multiple second downlink transmit beams, wherein the second downlink reference signals are transmitted using the multiple second downlink transmit beams being associated with multiple random-access occasions, and

wherein the method further comprising:

selecting a random-access occasion from the multiple random-access occasions based on said monitoring of the first downlink reference signals, and

transmitting, in the uplink frequency band, a random-access message to the communications network in the selected random-access occasion.

2. The method of claim 1 , further comprising:

based on said monitoring of the first downlink reference signals: determining a first downlink transmit beam of the multiple first downlink transmit beams,

wherein the random-access occasion is mapped to the determined first downlink transmit beam.

3. The method of claim 2 ,

wherein the random-access occasion is selected from the multiple random-access occasions based on a second downlink transmit beam of the multiple second downlink transmit beams that is determined based on a predefined mapping between the multiple first downlink transmit beams and the multiple second downlink transmit beams, or

wherein the random-access occasion is selected from the multiple random-access occasions based on a predefined mapping between the multiple first downlink transmit beams and the multiple random-access occasions.

4. The method of claim 1 , further comprising:

based on said monitoring of the second downlink reference signals: selecting a second downlink transmit beam from the multiple second downlink transmit beams, and

providing an indication of the selected second downlink transmit beam to the communications network.

5. The method of claim 4 ,

wherein the random-access message is indicative of the selected second downlink transmit beam.

6. The method of claim 5 ,

wherein the random-access message comprises an explicit indicator indicative of the selected second downlink transmit beam if the selected second downlink transmit beam is not associated with the selected random-access occasion.

7. The method of claim 1 , further comprising:

receiving scheduling information for the first downlink reference signals in the downlink frequency band.

8. The method of claim 1 , further comprising:

receiving a configuration information indicative of transmission of the first downlink reference signals in the uplink frequency band.

9. A method of operating an access node of a communications network, the access node configured to communicate with a wireless communication device using frequency duplex transmission in an uplink frequency band and in a downlink frequency band, the method comprising:

transmitting first downlink reference signals in the uplink frequency band and using multiple first downlink transmit beams, and

transmitting second downlink reference signals in the downlink frequency band and using multiple second downlink transmit beams,

wherein the second downlink reference signals are transmitted using the multiple second downlink transmit beams being associated with multiple random-access occasions, and

wherein the method further comprising:

monitoring, in the multiple random-access occasions, and using multiple uplink receive beams for a random-access message transmitted by the wireless communication device in the uplink frequency band; and

selecting an uplink receive beam from the multiple uplink receive beams based on said monitoring.

10. The method of claim 9 , further comprising:

obtaining an indication of a second downlink transmit beam of the multiple second downlink transmit beams from the wireless communication device,

selecting the second downlink transmit beam from the multiple second downlink transmit beams in accordance with the indication.

11. The method of claim 10 ,

wherein the random-access message provides the indication of the second downlink transmit beam.

12. A wireless communication device configured to communicate with a communications network using frequency duplex transmission in an uplink frequency band and in a downlink frequency band, the wireless communication device comprising control circuitry configured to:

monitor for first downlink reference signals transmitted by an access node of the communications network in the uplink frequency band and using multiple first downlink transmit beams, and

monitor for second downlink reference signals transmitted by the access node of the communications network in the downlink frequency band and using multiple second downlink transmit beams, wherein the second downlink reference signals are transmitted using the multiple second downlink transmit beams being associated with multiple random-access occasions, and

wherein the control circuitry is further configured to:

select a random-access occasion from the multiple random-access occasions based on said monitoring of the first downlink reference signals, and

transmit, in the uplink frequency band, a random-access message to the communications network in the selected random-access occasion.

Assignments (4)

Priority Claims (1)

Continuity (1)

References Cited (22)