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KR-20260064578-A - RANDOM ACCESS METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM

KR20260064578AKR 20260064578 AKR20260064578 AKR 20260064578AKR-20260064578-A

Abstract

A method of a device according to one embodiment of the present disclosure may include: receiving Msg0 from a reader indicating the start of a random access procedure; transmitting Msg1 for random access in a backscattered manner based on information contained in Msg0; receiving a plurality of Msg2s from the reader; transmitting Msg3 containing information of the device to the reader in a backscattered manner based on first information contained in the first Msg2, based on the existence of a first Msg2 among the Msg2s that responded to Msg1; and receiving Msg4 that responded to Msg3 from the reader.

Inventors

  • 윤찬호
  • 김철순

Assignees

  • 한국전자통신연구원

Dates

Publication Date
20260507
Application Date
20251027
Priority Date
20241030

Claims (20)

  1. In the method of the device, A step of receiving a message 0 (message 0, Msg0) from a reader indicating the start of a random access procedure; A step of transmitting message 1 (message 1, Msg1) for random access in a backscattering manner based on the information contained in the above Msg0; A step of receiving a plurality of messages 2 (message2, Msg2) from the above reader; A step of transmitting a message 3 (message 3, Msg3) containing information of the device to the reader in the backscattering manner based on the first information included in the first Msg2, based on the existence of a first Msg2 among the above Msg2s that responded to the above Msg1; and The method includes the step of receiving a message 4 (message 4, Msg4) in response to Msg3 from the reader, The above Msg0 includes at least one of counter information of at least one slot or frame, the ratio of an energy harvesting period (EHP) within a predetermined time interval, information on the minimum awake period of the device, a command type, and one or more of backward link (BL) occasion resource information. Device method.
  2. In claim 1, The above Msg0 is scrambled and transmitted using a scrambled bit sequence generated using a forward link (FL) start indicator sequence (SIS), Device method.
  3. In claim 1, The above Msg1 is transmitted to the reader based on a backscattering method in a BL occupation based on BL occupation resource information included in the above Msg0, and The above Msg1 is generated using a bit sequence utilizing the slot number or frame number to which the Msg1 is transmitted and a value randomly generated by the device, Device method.
  4. In claim 1, Among the plurality of Msg2s above, the second Msg2 includes second information for notifying devices that failed to transmit Msg1, and The second information above includes the next BL occlusion and the back-off maximum window value of Msg1, Device method.
  5. In claim 1, The first information comprises one or more of frequency resource allocation information based on FDMA for the transmission of the Msg3, slot or frame information for the transmission of the Msg3, or modulation order information of the data included in the Msg3. Device method.
  6. In claim 1, Based on the energy harvesting ratio of the above device or the ratio of EHP within a predetermined time interval being greater than or equal to a preset first value, modulating the Msg3 to a second modulation order higher than the first modulation order used during the transmission of the Msg1. Device method.
  7. In claim 1, The method further includes the step of transmitting acknowledgment (ACK) information in response to receiving the above Msg4 to the reader via the backscatter method. Device method.
  8. In terms of leadership methods, A step of transmitting message 0 (message 0, Msg0) instructing the devices to start a random access procedure on the downlink (Forward link, FL); A step of receiving messages 1 (message 1, Msg1) for random access from the devices based on the information contained in the above Msg0; A step of generating a first message 2 (message2, Msg2) containing first information to be transmitted to devices that have successfully received the above Msg1, and a second Msg2 containing second information to be transmitted to devices that have failed to receive the above Msg1; A step of time-division multiplexing the first Msg2s and the second Msg2 and transmitting them to the devices; A step of receiving a message 3 (message 3, Msg3) containing information of the device from one or more of the devices based on the first Msg2s; and The method includes the step of transmitting a message 4 (message 4, Msg4) in response to the above Msg3 to one or more devices, and The above Msg0 includes at least one of counter information of at least one slot or frame, the ratio of an energy harvesting period (EHP) within a predetermined time interval, information on the minimum awake period of the device, a command type, and one or more of backward link (BL) occasion resource information. Leader's Method
  9. In claim 8, The above Msg0 is scrambled and transmitted using a scrambled bit sequence generated using a forward link (FL) start indicator sequence (SIS), The Leader's Method
  10. In claim 9, The above Msg1 is generated using a bit sequence utilizing the slot number or frame number to which the Msg1 is transmitted and a value randomly generated by the device, Leader's Method
  11. In claim 9, The second information above includes the next BL occlusion and the back-off maximum window value of Msg1, Leader's Method
  12. In claim 8, The first information comprises one or more of frequency resource allocation information based on FDMA for the transmission of the Msg3, slot or frame information for the transmission of the Msg3, or modulation order information of the data included in the Msg3. Leader's Method
  13. In claim 8, Based on the energy harvesting ratio of the above device or the ratio of EHP within a predetermined time interval being greater than or equal to a preset first value, modulating the Msg3 to a second modulation order higher than the first modulation order used during the transmission of the Msg1. The Leader's Method
  14. In claim 8, The method further includes the step of transmitting acknowledgment (ACK) information in response to receiving the above Msg4 to the reader via the backscatter method. Leader's Method
  15. In terms of the device, The above device includes at least one processor, and the at least one processor is the device: Receive message 0 (message 0, Msg0) from the reader instructing the start of a random access procedure; Based on the information contained in the above Msg0, transmit message 1 (message 1, Msg1) for random access in a backscattering manner; Receive a plurality of messages 2 (message2, Msg2) from the above reader; Based on the existence of a first Msg2 among the above Msg2s that responded to the above Msg1, a message 3 (message 3, Msg3) containing information of the device is transmitted to the reader in the backscattering manner based on the first information contained in the first Msg2; and Causes the reception of message 4 (message 4, Msg4) responding to Msg3 from the above reader, and The above Msg0 includes at least one of counter information of at least one slot or frame, the ratio of an energy harvesting period (EHP) within a predetermined time interval, information on the minimum awake period of the device, a command type, and one or more of backward link (BL) occasion resource information. Device.
  16. In claim 15, The above Msg0 is scrambled and transmitted using a scrambled bit sequence generated using a forward link (FL) start indicator sequence (SIS), Device.
  17. In claim 15, The above Msg1 is transmitted to the reader based on a backscattering method in a BL occupation based on BL occupation resource information included in the above Msg0, and The above Msg1 is generated using a bit sequence utilizing the slot number or frame number to which the Msg1 is transmitted and a value randomly generated by the device, Device.
  18. In claim 15, Among the plurality of Msg2s above, the second Msg2 includes second information for notifying devices that failed to transmit Msg1, and The above second information includes the next BL occlusion and the back-off maximum window value of Msg1, Device.
  19. In claim 15, The first information comprises one or more of frequency resource allocation information based on FDMA for the transmission of the Msg3, slot or frame information for the transmission of the Msg3, or modulation order information of the data included in the Msg3. Device.
  20. In claim 15, Based on the energy harvesting ratio of the above device or the ratio of EHP within a predetermined time interval being greater than or equal to a preset first value, modulating the Msg3 to a second modulation order higher than the first modulation order used during the transmission of the Msg1. Device.

Description

Random Access Method and Apparatus in Wireless Communication System The present disclosure relates to random access technology in a wireless communication system, and more specifically, to random access technology in a wireless communication system using an Integrated Sensing and Communication (ISAC) method. Mobile communication systems have evolved from the 4th generation ( 4th generation) long-term evolution (LTE) to the 5th generation (5G) new radio (NR), and each generation has evolved with the goal of exceeding the requirements of the previous generation. One example is the goal of 5G NR to achieve 20 times the maximum transmission rate/capacity of 4G LTE. To achieve 20 times the maximum transmission rate/capacity of 4G LTE, 5G NR sought to increase the capacity of the cellular system by utilizing new frequency bands such as the 3.5 GHz center frequency, allocating wide bandwidth, applying multiple antennas and multiple transmission and reception radio frequency (RF) chains for massive multiple input and multiple output (MIMO), and applying multiple spatial layers. In addition, 5G NR applies beamforming (BF) that takes into account the wide bandwidth and channel characteristics of the 28GHz millimeter wave (mmWave) band, which primarily uses time division duplexing (TDD), and achieves 20 times the maximum transmission rate/capacity of 4G LTE. Meanwhile, the 6th generation (6G) mobile communication network (or cellular network) includes achieving a maximum capacity/transmission rate 20 times higher than 5G NR. In addition, the 6G mobile communication network is expected to aim not only for increasing frequency efficiency but also for a convergent tendency of devices, such as Internet of Things (IoT)-based sensors, in line with the trends of the Fourth Industrial Revolution. Examples of 6G mobile communication networks include non-terrestrial networks (NTN), integrated sensing and communication (ISAC), and ambient IoT (AIoT), which extends the concept of existing radio frequency identification (RFID) systems into the application areas of IoT. While discussions regarding AIoT technology are currently underway, no method has been proposed to provide AIoT devices with fair (pair) channel access opportunities. Therefore, there is a need to provide a protocol that enables AIoT devices to transmit upstream channels. FIG. 1 is a conceptual diagram illustrating an embodiment of a communication system. FIG. 2 is a block diagram illustrating an example of a communication node constituting a communication system. Figure 3a is a conceptual diagram of the overall frame configuration of the AIoT system. Figure 3b is a conceptual diagram of the case where the communication section of the AIoT system consists of FL and BL. Figure 3c is a conceptual diagram of a case where the communication section of an AIoT system consists only of a FL transmission section. Figure 3d is a conceptual diagram of a case where the communication section of an AIoT system consists only of a BL transmission section. Figure 4 is a conceptual diagram illustrating a case where a 5G NR base station generates an AIoT-style signal and transmits the signal during an energy harvesting period. Figure 5a is a conceptual diagram of a configuration to explain the procedure for processing data transmitted via PDRSCH in an AIoT system. Figure 5b is a conceptual diagram illustrating the process of encoding data transmitted via PDRSCH in an AIoT system. Figure 5c is a conceptual diagram illustrating the case where data transmitted via PDRSCH in an AIoT system is modulated in the OOK-1 manner. FIG. 5d is a conceptual diagram illustrating the case where data transmitted via PDRSCH in an AIoT system is modulated in the OOK-4 manner. Figure 6a is a conceptual diagram illustrating a method for generating a CP OFDM signal using a symmetric duplication method in an AIoT system. FIG. 6b is a conceptual diagram illustrating the output of an OOK modulation scheme corresponding to an OFDM symbol of sample length 512 in a 5G NR system. FIG. 6c is a conceptual diagram illustrating the output of an OOK modulation scheme corresponding to an OFDM symbol of sample length 1024 in a 5G NR system. Figure 7 is a conceptual diagram illustrating the configuration of a CP OFDM signal transmitted in the FL transmission section of an AIoT system. Figure 8 is a conceptual diagram illustrating the configuration of PDRSB and the configuration of transmitted OFDM symbols in an AIoT system. FIG. 9a is a timing diagram illustrating the operation in a specific time interval to explain the case where a RACH procedure is performed between a reader and a device in an AIoT system. FIG. 9b is a timing diagram in a time interval continuous with FIG. 9a when a RACH procedure is performed between a reader and a device in an AIoT system. FIG. 9c is a timing diagram in a time interval continuous with FIG. 9c when a RACH procedure is performed between a reader and a device in an AIoT system. FIG. 10a