Phase Anchored Sectional CPI ISAC

Abstract

The invention relates to a system that enables the implementation of integrated sensing and communication, i.e., ISAC, functions in wireless communication systems. In the system in question, the ISAC source planner (10) determines how the communication and sensing operations are placed within the time-frequency sources. Based on this planning information, the sub-CPI segment generator (11) divides the coherent processing interval, i.e., CPI, to be used for sensing, into multiple sub-CPI measurement segments (50) instead of treating it as a single, uninterrupted measurement interval. Thus, the system can perform sensing measurements within a segmented CPI structure despite interruptions such as slot limitations, beam switching, scheduling gaps, TDD transitions, numerology changes, etc., encountered in the practical NR / 6G air interface.

Description

1 TARIFF Phase Anchored Sectional CPI ISAC Technical Area 5 The invention relates to integrated sensing and communication (ISAC) in wireless communication systems. It relates to a system that enables the performance of its functions. State of the Art Current 5G and 5G-Advanced NR systems are primarily for communication services. They are designed with integrated sensing and communication (ISAC) functions in mind for these systems. It is considered a newly added capability. 3GPP TS 22.137 “Integrated The "Sensing and Communication" document describes how the 5G system detects objects in the environment. its ability to detect, track and provide sensing services, especially for moving objects. It is stated that it should support continuity. Also, under 3GPP Rel-20, RAN1 15 FS_Sensing_NR_bis work item and related 3GPP TR carried out under its responsibility 38.765 “Study on Integrated Sensing And Communication (ISAC) for NR” document, NR ISAC sensing functions on the air interface are still an active subject of research. This shows that. However, current NR-based applications require a long time frame of 20 for the sensing process. Ensuring a phase-coordinated measurement range is practically impossible without interruption. Radar-like... In detection processes, in order to accurately determine the target's velocity and Doppler data, a specific... The coherent processing interval (CPI) is the interval during which the phase information of the received echo signals is consistent. It needs to be protected in this way. However, in NR systems, resources are stored on a slot and symbol basis. It is planned; user traffic, scheduling decisions, beam switching, TDD transitions, 25 Uplink / downlink resource sharing, numerology changes, phase shifts in the RF chain, and Due to timing gaps, sensing measurements are often single-piece and phase-continuous. It cannot be obtained as a CPI. In current solutions, sensing burst or sensing reference signals are usually discrete-time signals. They are sent in intervals, and each measurement interval is often treated as an independent measurement, like 30. This approach is evaluated. While it seems sufficient for some processes such as distance estimation, This creates significant shortcomings in terms of Doppler processing and rate estimation. Measurement ranges When unknown phase offsets occur between them, echo signals from different segments They cannot be combined as if they had the same phase reference. This situation reduces the gain of coherent integration. It reduces, causes spreading and lateral lobe increase in the Doppler spectrum, and results in an erroneous target velocity of 35. 2 This can lead to predictions, and especially the tracking of weakly reflective or moving targets. It makes it more difficult. Current communication reference signals, such as DMRS, CSI-RS, or PRS, primarily for channel estimation, demodulation, measurement or positioning purposes These reference signals are designed between 5 intermittent ISAC sensing CPI segments. Each sub-CPI will allow for phase stitching before the Doppler procedure. systematically designed for use as a phase anchor specific to its segment It is not defined. In other words, in the existing structures, CPI is not consciously subdivided into sub-segments. separation, addition of phase anchors to each segment, and segment phase offsets from these anchors. extraction and virtual phase-continuous single 10 segments before Doppler processing There is no integrated mechanism for converting it to CPI. Furthermore, in current systems, phase continuity and power consistency are mostly communication-focused. This is considered in terms of channel estimation or the reliability of multi-slot transmissions. these approaches directly address the need for long-term coherent Doppler processing on the sensing side. It does not resolve. On the communication side, a slot or group of reference signals has 15 within itself. Even if phase coherence can be maintained, slot boundaries, beam variations, transmission gaps, or RF issues may cause problems. phase jumps occurring after restructuring sensing CPI integrity Its effects are not adequately mitigated in current practices. Therefore, the communication system... While phase discontinuities are acceptable in terms of performance, they cause serious performance issues on the ISAC sensing side. It can lead to loss. 20 Another shortcoming of current ISAC approaches is the continuity of sensing and communication sources. It does not offer a direct balance mechanism between flexibility and network load. When network load increases or When resource planning is done for different users, sensing signals can become fragmented. In this situation, the system either has to accept low Doppler resolution by using a short CPI, or... Long CPIs require stricter allocation of communication resources. Every 25 In both cases, the primary goal of ISAC is efficient communication within the same radio infrastructure. The ability to perform high-quality sensing functions simultaneously is limited. Consequently, current techniques provide ISAC sensing that is obtained intermittently or piecemeal. By aligning the measurements in terms of phase, it opens up the processing area as a single virtual phase-continuous CPI, There is no systematic solution adapted to the NR / 6G ISAC architecture. This deficiency; 30 Moving target detection, velocity estimation, high-resolution Doppler processing, and sensing. This limits detection performance in applications requiring service continuity and is not covered by 3GPP. Meeting the defined ISAC service objectives under practical NR air interface conditions. It makes things more difficult. 35 3 Purpose of the Invention The main purpose of the invention is to enable ISAC sensing measurements, which are performed intermittently or piecemeal, A single virtual phase-continuous coherent is achieved by phase alignment prior to Doppler processing. The aim is to enable the use of processing intervals, or CPIs. Another objective of the invention is to divide the CPI duration into multiple sub-CPI segments and to separate each of the 5 a short reference symbol or reference signal that acts as a phase anchor within the segment By placing them, the phase state of each segment can be estimated separately, and the segments can be compared to a common one. The aim is to enable coupling based on the phase reference. Another aim of the invention is to analyze sensing segments obtained at different time intervals. Instead of being considered as independent measurements, a single 10² ... The aim is to ensure that communication resource planning is processed within a virtual CPI framework. The goal is to improve sensing performance while maintaining flexibility; beam switching and multi-beam. In operational scenarios, by ensuring that each sub-CPI segment carries its own phase information, The effect of phase uncertainties occurring after beam switching on the sensing process. The aim is to reduce; to provide robustness against phase instabilities in RF equipment; the current 15 The entire system can be implemented in accordance with NR / 6G air interface principles. without requiring a change in the architecture, to the existing time-frequency resource planning structure The aim is to provide a signal processing and reference design mechanism that can be added; moving object Available in applications requiring detection, speed estimation, target tracking, and sensing continuity. to provide higher detection reliability compared to existing techniques; NR / 6G ISAC 20 Intermittent measurement, phase discontinuity, and short CPI issues encountered in Doppler systems. The goal is to offer an integrated solution to performance degradation problems. Figures that will help understand the invention. Figure 1 shows the general architecture of the system that is the subject of the invention. 25 Explanation of Part References 10. ISAC Resource Planner 11. Sub-CPI segment generator 12. Phase anchor reference signal adder 30 13. ISAC waveform and RF transmitter unit 20. Target or environment to be perceived. 21. Transmitted sensing signal / lighting path 22. Target echo signal / return path 30. Sensing RF receiver unit 35 Phase 31 anchor disconnect switch 4 32nd Segment Phase Compensation Block 33. Virtual phase-continuous CPI combiner 40. Range-Doppler processor 41. Virtual CPI processing transfer path 50. Sub-CPI measurement segment 5 51. Phase anchor symbol / reference signal 52. Interruption / beam switching / scheduling gap Section 53: CPI time structure feedback / configuration relationship Detailed Description of the Invention 10 In this detailed description, the preferred configurations of the system that is the subject of the invention are listed only. This will contribute to a better understanding of the subject and will not have any limiting effects. The invention relates to integrated sensing and communication (ISAC) in wireless communication systems. It is a system that enables the performance of its functions. In the system that is the subject of the invention, the ISAC resource planner (10), communication and sensing operations 15 It determines how time-frequency resources will be placed within it. This planning information... In line with this, the sub-CPI segment generator (11) will be used for the coherent sensing process. Processing interval, or CPI, is considered as a single, continuous measurement interval. Instead, it divides it into multiple sub-CPI measurement segments (50). Thus, the system is practical for NR / 6G air Interface issues encountered include slot limitations, beam switching, scheduling gaps, TDD transitions, and 20. Despite numerological changes or similar interruptions, the sensing measurement is segmented CPI. It can be accomplished within its structure. Sub-CPI measurement segments (50) generated by sub-CPI segment generator (11), phase The anchor reference signal is transferred to the adder (12). The phase anchor reference signal adder (12) transfers each At least one phase anchor representing the phase status of the relevant segment is attached to the sub-CPI measurement segment (50). Adds the symbol or phase anchor reference signal (51). These phase anchor symbols or reference signals (51) are then used to estimate the phase offset of each segment on the receiver side. It establishes the phase references to be used. The segmented CPI time structure shown below is returned. notification / configuration relationship (53), sub-CPI measurement segments (50), phase anchoring symbols (51) and interruption / beam switching / scheduling gap (52), system 30 It represents a function related to segment creation and phase anchoring. Sectional CPI structure with added phase anchors, ISAC waveform and RF transmitter unit (13) It is converted into a physical ISAC sensing waveform, converted to radio frequency, and Transmitted through the antenna to the environment. Transmitted sensing signal / illumination path (21), ISAC waveform and it radiates from the RF transmitter unit (13) towards the target or environment (20) to be detected. 35 The target or environment to be detected (20) is illuminated by the transmitted sensing signal, and this As a result of illumination, an echo is generated from the target or environment. The resulting target echo signal / The return path (22) reaches the sensing RF receiver unit (30) on the receiving side. Sensing RF receiver unit (30), echo coming through target echo signal / return path (22) It receives the signal, downscales it from radio frequency to baseband, and then processes it into subsequent sensing blocks. It transmits. Within the received signal, the phase anchor symbol for each sub-CPI measurement segment (50) or 5 The phase anchor reference signal (51) is also found. The phase anchor estimator (31) uses these phase anchor symbols. or phase status of each sub-CPI measurement segment (50) using reference signals (51) or estimates the phase offset that occurs between segments. Thus, interruption / beam switching / scheduling gap (52) or RF-induced phase jumps cause them to become disconnected from each other The phase relationship of the incoming segments can be redefined. 10 The phase offset information obtained by the phase anchor estimator (31) is fed into the segment phase compensation block. (32) is transferred. The segment phase compensation block (32) combines the phase of each sub-CPI measurement segment (50). It corrects according to a phase reference. As a result of this process, normally discontinuous and phase-out relative to each other are corrected. In particular, the sub-CPI measurement segments that are unclear (50) become phase-aligned. Phase 15 that may occur in CPI due to interruption / beam switching / scheduling gap (52) Discontinuities are compensated for using phase anchor symbols or reference signals (51). The phase-corrected sub-CPI measurement segments are transferred to the virtual phase-continuous CPI combiner (33). Virtual phase-continuous CPI combiner (33), phase compensated sub-CPI measurement segments (50), It combines the virtual phase-continuous CPI structure before the Doppler process. At this stage... The system processes sensing measurements obtained in a physically discontinuous and fragmented manner. This makes it usable as a single, phase-continuity preserved CPI. This virtual CPI Its structure constitutes the main technical output of the invention. Phase-aligned measurement data from the virtual phase-continuous CPI combiner (33) is processed using virtual CPI processing. It is transmitted to the Range-Doppler processor (40) via the transfer path (41). Range-Doppler processor (40) performed distance and Doppler processing on this virtual phase-continuous CPI 25 Extracts distance, velocity, Doppler or motion information about the target or environment (20) to be detected. Thus, the long-term losses that can occur due to intermittent sensing measurements in current systems can be avoided. The coherent processing gain is preserved thanks to the phase-anchored segmented CPI structure. With this working principle, the invention involves dividing the CPI into sub-CPI measurement segments (50), each Adding a segment phase anchor symbol or reference signal (51), interruption / beam switching / 30 Phase anchoring of segment phase offsets after discontinuities such as scheduling gap (52) Estimation by the estimator (31), correction by the segment phase compensation block (32) and conversion of virtual phase-continuous CPI into a single virtual CPI structure by a combiner (33) It uses the steps together. In this way, the ISAC resource planner (10) uses the sub-CPI segment generator (11), phase anchor reference signal adder (12), ISAC waveform and RF transmitter unit 35 (13), transmission and echo paths (21, 22), sensing RF receiver unit (30), phase anchor estimator (31), 6 segment phase compensation block (32), virtual phase-continuous CPI combiner (33), virtual CPI processing transfer The path (41) and the Range-Doppler processor (40) work together to perform intermittent ISAC sensing. It creates a virtual phase-continuous CPI suitable for Doppler processing from the measurements.

Claims

7 REQUESTS 1. Integrated sensing and communication, or ISAC, in wireless communication systems. It is a system that enables the performance of its functions, and its characteristic feature is; • How communication and sensing processes are integrated within time-frequency sources ISAC resource planner (10), 5 •The coherent processing interval, or CPI, to be used for the sensing process, must have a single duration. Instead of treating it as a single, continuous measurement range, it is divided into multiple sub-CPI measurement segments. (50) sub-CPI segment generator (11), • For each sub-CPI measurement segment (50), at least one phase representing the phase status of the relevant segment. phase anchor reference signal 10 which adds the anchor symbol or phase anchor reference signal (51) adder (12), • Converts a segmented CPI structure with added phase anchors into a physical ISAC sensing waveform, ISAC waveform and RF transmitter that outputs to radio frequency and transmits it to the environment via the antenna. unit (13), • ISAC waveform and RF transmitter unit (13) output to the target or environment (20) 15 correctly propagating transmitted sensing signal / lighting path (21), •reflected from the target or environment (20) to be detected and to the sensing RF receiver unit on the receiver side (30) reaching target echo signal / return path (22), •Radio receiving the echo signal coming through the target echo signal / return path (22) sensing RF 20 downloads the frequency from the baseband and passes it to subsequent sensing processing blocks. receiver unit (30), •phase anchor symbols or reference signals in the received sensing signal (51) using the phase status of each sub-CPI measurement segment (50) or between segments Phase anchor estimator (31) which estimates the resulting phase offset. • Using the phase offset information obtained from the phase anchor estimator (31), each sub-CPI measurement 25 Segment phase compensation block (32) which corrects the phase of segment (50) according to a common phase reference, •phase compensated sub-CPI measurement segments (50) are placed in a single virtual environment before Doppler processing. virtual phase-continuous CPI combiner (33), which combines in the form of a phase-continuous CPI structure, •Range of the phase-aligned measurement data from the virtual phase-continuous CPI combiner (33) The virtual CPI processing transfer path (41), which enables transfer to the Doppler processor (40), 30 • Target to be detected by performing distance and Doppler processing on virtual phase-continuous CPI. or Range-Doppler which extracts distance, velocity, Doppler or motion information relating to the environment (20). processor (40) It includes.

2. It is a system that conforms to Request 1, and its feature is; sub-CPI measurement segments (50), phase anchor 35 symbols (51) and interruption / beam switching / scheduling gap (52), of the system 8 The segmented CPI represents that it is related to the segment creation and phase anchoring functions. time structure feedback / configuration relationship (53) is included.

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