Method and device for wireless communication

Abstract

The invention discloses a method and equipment for wireless communication. The first transmitter is used for transmitting a first signal in a first random access process, and the type of the first random access process is four-step random access; the first processor is used as a response to expiration of the first time window, and a random access sending counter is added; the start of the first time window depends on the transmission of the first signal; the first signal is any one of a first candidate signal and a second candidate signal; the first candidate signal occupies a time-frequency resource in a first time-frequency resource set, the second candidate signal occupies a time-frequency resource in a second time-frequency resource set, and in the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is used as a PRACH. According to the scheme, the random access performance can be improved.

Description

Technical Field

[0001] The present application relates to a transmission method and apparatus in a wireless communication system, and particularly to a method and apparatus for a random access (RA) process. Background Art

[0002] In wireless communication, technologies such as LTE (Long Term Evolution) or 5G NR involve random access processes. The random access process can be divided into a contention-based random access process (Contention-Based Random Access, Contention-based RACH, abbreviated as CBRA) and a contention-free random access process (Contention-Free Random Access, Contention-free RACH, abbreviated as CFRA). Among them, CBRA is mainly used for initial RRC connection establishment, RRC connection reestablishment, and recovery from RRC inactive state or RRC idle state to RRC connected state, etc., while CFRA is generally used for inter-cell handover or BFR (Beam Failure Recovery) or UE (User Equipment) positioning. Different from the contention-based random access of CBRA, the process of contention-free random access of CFRA is relatively simple. Before the UE selects CFRA to initiate access, the base station will allocate a dedicated random access resource to the UE to avoid contention conflicts during the random access process of the UE.

[0003] In traditional 4G LTE and 5G NR systems, the four-step random access (4-step RACH) technology is supported, which generally includes two interactions between the UE and the base station. The four-step random access process can be divided into two types: CBRA and CFRA. Taking the initial access of the UE as an example, the main process of the four-step CBRA random access process is as follows: The UE selects a random access sequence (preamble) from the random access sequence resource pool and sends this preamble on the PRACH (Physical Random Access Channel). After sending the preamble, the UE listens for the PDCCH (Physical downlink control channel) within the RAR (Random Access Response) window (ra-ResponseWindow) to receive the RAR. If the RAR is successfully received, the UE can send Msg3 and complete the random access process after receiving the Msg4 (such as random access conflict resolution) message; if the RAR is not successfully received within the RAR window, the value of PREAMBLE_TRANSMISSION_COUNTER needs to be increased, and it is determined whether to re-send the preamble according to the value of PREAMBLE_TRANSMISSION_COUNTER. Summary of the Invention

[0004] In the existing protocol, during the random access process of the UE, the value of PREAMBLE_TRANSMISSION_COUNTER is related to the number of attempts of the preamble. However, the inventor believes that the existing preamble has problems such as a relatively large delay caused by the PRACH timing, and / or a relatively large conflict probability, and / or poor reciprocity between the PRACH and the downlink reference signal. With the continuous evolution of wireless technology, it is difficult for the preamble to adapt to certain scenarios. Therefore, in future specific scenarios, there is a possibility of using other wireless signals instead of or in combination with the preamble to initiate random access. Under this condition, in the existing protocol, PREAMBLE_TRANSMISSION_COUNTER only accumulates the number of transmissions of the preamble and cannot accurately count the number of random access attempts, thus affecting the system performance. Therefore, the random access process needs to be enhanced.

[0005] In view of the above problems, the present application provides a solution for the random access process. In the above problem description, the NR system is taken as an example. The present application is also applicable to scenarios such as future 3GPP systems and achieves technical effects similar to those of the NR system. Further, although the original intention of the present application is for the terrestrial network (TN) scenario, the present application is also applicable to the communication scenario of the non-terrestrial network (NTN) and achieves technical effects similar to those in the TN scenario. In addition, adopting a unified solution for different scenarios helps to reduce hardware complexity and cost.

[0006] As an embodiment, the interpretation of the terms in the present application refers to the definitions in the 3GPP specification protocol series TS36.

[0007] As an embodiment, the interpretation of the terms in the present application refers to the definitions in the 3GPP specification protocol series TS38.

[0008] As an embodiment, the interpretation of the terms in the present application refers to the definitions in the 3GPP specification protocol series TS37.

[0009] It should be noted that, without conflict, the embodiments and features in any node of the present application can be applied to any other node. Without conflict, the embodiments and features in the present application can be combined with each other arbitrarily.

[0010] The present application discloses a method in a first node used for wireless communication, characterized by including: sending a first signal in a first random access process, where the type of the first random access process is a four-step random access; increasing a random access transmission counter as a response to the expiration of a first time window; where the start of the first time window depends on the transmission of the first signal; the first signal is any one of a first candidate signal and a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

[0011] As an embodiment, the problems to be solved by the present application include: how to enhance the random access process, improve the random access success rate, and improve the random access performance.

[0012] As an embodiment, the technical problems to be solved by the present application further include: how to avoid misstatistical random access failure times and improve system performance.

[0013] As an embodiment, the present technical solution uses any one of the first candidate signal and the second candidate signal to initiate a random access process, and among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is used as the PRACH, which expands the application scenario of initiating the random access process and adds the second candidate signal to initiate random access, which is beneficial to shortening the delay of the random access process and increasing the success probability of random access; at the same time, the random access sending counter accumulates the number of times the first candidate signal and the second candidate signal initiate random access and fail, avoiding cumulative errors, thereby achieving the technical effect of enhancing the random access process, greatly improving the random access performance, and improving the system efficiency.

[0014] As an embodiment, in the first random access process, RA_TYPE is set to 4-step RA.

[0015] As an embodiment, in the first random access process, before sending the first signal, RA_TYPE is set to 4-stepRA.

[0016] As an embodiment, the first random access procedure is a CFRA.

[0017] As an embodiment, the first random access procedure is a CBRA.

[0018] As an embodiment, the first random access process is performed on a MAC entity of an MCG (Master Cell Group) of the first node.

[0019] As an embodiment, the first random access process is performed on a MAC entity of an SCG (Secondary Cell Group) of the first node.

[0020] As an embodiment, the first signal is sent on a service cell of the first node.

[0021] As an embodiment, the first signal is sent on a candidate cell of the first node.

[0022] As an embodiment, the one serving cell is a PCell.

[0023] As an embodiment, the one serving cell is a PSCell.

[0024] As an embodiment, the first time window is used to receive a feedback message from the second node after receiving the first signal; the feedback message includes a random access response (RAR) message.

[0025] As another embodiment, the first time window is used for PDCCH, and the PDCCH indicates scheduling information of RAR.

[0026] As a sub-embodiment, the first time window is a ra-ResponseWindow.

[0027] As a sub-embodiment, the first time window is a time window.

[0028] As a sub-embodiment, the first time window is not ra-ContentionResolutionTimer.

[0029] As a sub-embodiment, the name of the first time window includes Window.

[0030] As a sub-embodiment, the name of the first time window includes ResponseWindow.

[0031] As an embodiment, in the first time window, the PDCCH scrambled by the C (Cell)-RNTI (Radio Network Temporary Identifier) is monitored.

[0032] As an embodiment, in the first time window, the PDCCH scrambled by the RA-RNTI is monitored.

[0033] As an embodiment, in the first time window, the PDCCH scrambled by the C-RNTI or RA-RNTI is monitored.

[0034] As an embodiment, in the first time window, a PDCCH scrambled by a perception RNTI is monitored; the first signal is the second candidate signal.

[0035] As an embodiment, the perception RNTI is exclusive to the first node.

[0036] As an embodiment, the sensing RNTI is public.

[0037] As an embodiment, the sensing RNTI is common to all cells.

[0038] As an embodiment, the sensing RNTI is common to a cell group.

[0039] As an embodiment, the sensing RNTI is S (sensing)-RNTI.

[0040] As an embodiment, the sensing RNTI is an ISAC-RNTI.

[0041] As an embodiment, the sensed RNTI is calculated by the first node according to the sensing occasion.

[0042] As an embodiment, the above method is compatible with RA-RNTI.

[0043] As an embodiment, the above method is beneficial to the access of multiple UEs.

[0044] As an embodiment, the above method improves resource utilization.

[0045] As an embodiment, the above method is simple to implement.

[0046] As an embodiment, the sensed RNTI is RRC-configured.

[0047] As an embodiment, the above method is simple to implement.

[0048] As an embodiment, at least part of the sensed RNTI is RRC-configured, and at least part of the sensed RNTI is calculated by the first node according to the sensing occasion.

[0049] As an embodiment, the above method balances resource competition and the number of UEs accessing.

[0050] As an embodiment, that the start of the first time window depends on the transmission of the first signal means that: at least after the last symbol of the first signal is transmitted, the first time window starts.

[0051] As an embodiment, that the start of the first time window depends on the transmission of the first signal means that: at the first PDCCH occasion after the first signal is transmitted, the first time window starts.

[0052] As an embodiment, that the start of the first time window depends on the transmission of the first signal means that: at the first symbol after the first signal is transmitted, the first time window starts.

[0053] As an embodiment, that the start of the first time window depends on the transmission of the first signal means that: at the first symbol of the earliest CORESET (control resource set) of the Type1-PDCCH CSS (Common Search Space) set configured for the first node to receive PDCCH after the first signal is transmitted, the first time window starts.

[0054] As an embodiment, that the start of the first time window depends on the transmission of the first signal means that: at the K1-th symbol after the first signal is transmitted, the first time window starts; where K1 is greater than 1.

[0055] As an example, the sending of the first signal means the sending of the last symbol of the first signal.

[0056] As an example, the sending of the first signal means the end of the sending of the first signal.

[0057] As an example, the sending of the first signal means the start of the sending of the first signal.

[0058] As an example, the start of the first time window depends on the sending of the first signal, and the start of the first time window depends on whether the first signal is the first candidate signal or the second candidate signal.

[0059] As a sub - example of the above example, if the first signal is the first candidate signal, at the first PDCCH occasion after the first signal is sent, start the first time window; if the first signal is the second candidate signal, start the first time window when the first signal starts to be sent.

[0060] As a sub - example of the above example, if the first signal is the first candidate signal, at the first PDCCH occasion after the first signal is sent, start the first time window; if the first signal is the second candidate signal, start the first time window at the K1 - th symbol after the first signal is sent; K1 is greater than 1.

[0061] As an example, the expiration of the first time window means that no feedback message from the second node is received within the time period of the first time window. As a sub - example, the expiration of the first time window means that no RAR message sent by the second node is received within the time period of the first time window.

[0062] As an example, regardless of whether the first signal is the first candidate signal or the second candidate signal, in response to the expiration of the first time window, increase the random access transmission counter. In a sub - example, the random access transmission counter is PREAMBLE_TRANSMISSION_COUNTER.

[0063] As an example, in response to the expiration of the first time window, increase the value of the random access transmission counter; the first signal is the first candidate signal. In a sub - example, the random access transmission counter is PREAMBLE_TRANSMISSION_COUNTER.

[0064] As an embodiment, in response to the expiration of the first time window, the random access transmission counter is increased; the first signal is the second candidate signal. In a sub-embodiment, the random access transmission counter is PREAMBLE_TRANSMISSION_COUNTER.

[0065] As an embodiment, the first signal is the first candidate signal.

[0066] As an embodiment, the first signal is the second candidate signal.

[0067] As an embodiment, the first candidate signal is indexed by ra-PreambleIndex.

[0068] As an embodiment, the first candidate signal is a random access preamble (Random Access Preamble).

[0069] As an embodiment, the first candidate signal is a Preamble.

[0070] As an embodiment, in random access resource selection, the time-frequency resources of the first signal are determined from the first time-frequency resource set and the second time-frequency resource set.

[0071] As an embodiment, in the random access procedure initialization, the time-frequency resources of the first signal are determined from the first time-frequency resource set and the second time-frequency resource set.

[0072] As an embodiment, the time-frequency resources of the first signal are determined from the first time-frequency resource set and the second time-frequency resource set based on measurement.

[0073] As an embodiment, the time-frequency resources of the first signal are determined from the first time-frequency resource set and the second time-frequency resource set according to the RRC configuration.

[0074] As an embodiment, the first time-frequency resource set is a set of random access resources available for the first random access process; the first signal is the first candidate signal.

[0075] As an embodiment, the second time-frequency resource set is a random access resource set that can be used for the first random access process; and the first signal is the second candidate signal.

[0076] As an embodiment, the first time-frequency resource set and the second time-frequency resource set are respectively a random access resource set that can be used for the first random access process; and the first signal is the second candidate signal.

[0077] As an embodiment, the first time-frequency resource set includes time domain resources and frequency domain resources.

[0078] As an embodiment, the first time-frequency resource set includes at least one RB (Resource Block).

[0079] As an embodiment, the first time-frequency resource set includes at least one RE (Resource Element).

[0080] As an embodiment, the first time-frequency resource set includes at least one RO (RACH Occasion).

[0081] As an embodiment, the second time-frequency resource set includes time domain resources and frequency domain resources.

[0082] As an embodiment, the second time-frequency resource set includes at least one RB.

[0083] As an embodiment, the second time-frequency resource set includes at least one RE.

[0084] As an embodiment, the second time-frequency resource set includes at least one sensing opportunity.

[0085] As an embodiment, a sensing opportunity is a Sensing Occasion (SO).

[0086] As an embodiment, one sensing opportunity occupies continuous time domain resources and continuous frequency domain resources.

[0087] As an embodiment, one sensing opportunity occupies non-continuous time domain resources and continuous frequency domain resources.

[0088] As an embodiment, one sensing opportunity occupies (y / x) symbols.

[0089] As an embodiment, x is an integer greater than 1; y is an integer not less than 1.

[0090] As an embodiment, y is 1.

[0091] As an embodiment, y is greater than 1.

[0092] As an embodiment, the symbol is a multi-carrier symbol.

[0093] As an example, the symbol is used in the NR system.

[0094] As an example, the symbol is used in the 6G system.

[0095] As an example, the symbol is used in the positioning system.

[0096] As an example, the symbol is used in the sensing system.

[0097] As an example, the symbol is used in the ISAC system.

[0098] As an example, the symbol is an OFDM (Orthogonal Frequency Division Multiplexing) symbol.

[0099] As an example, the symbol is an OFDMA (OFDM Access) symbol.

[0100] As an example, the symbol is a CP-OFDM symbol.

[0101] As an example, the symbol is a DFT-S-OFDM symbol.

[0102] As an example, the symbol is an FMCW symbol.

[0103] As an example, the symbol is an OTFS (Orthogonal Time Frequency Space) symbol.

[0104] As an example, the second time-frequency resource set and the first time-frequency resource set partially overlap.

[0105] As an example, the second time-frequency resource set and the first time-frequency resource set do not overlap.

[0106] As an example, the second time-frequency resource set is not configured for PRACH.

[0107] As an example, the second time-frequency resource set is not for PRACH.

[0108] As an example, the second time-frequency resource set is configured for SRS (Sounding Reference Signal).

[0109] As an embodiment, the second time-frequency resource set is configured for PUSCH (Physical uplink shared channel).

[0110] As an embodiment, the second time-frequency resource set is configured for PUCCH (Physical uplink control channel).

[0111] As an embodiment, the second time-frequency resource set is configured to a sidelink (SL) channel.

[0112] As an embodiment, the second time-frequency resource set is configured for the secondary link signal.

[0113] As an embodiment, the second time-frequency resource set is configured for a measurement gap (Measurement Gap).

[0114] As an embodiment, the second time-frequency resource set is configured for a sensing channel.

[0115] As an embodiment, the sensing channel is an Integrated Sensing and Communication (ISAC) sensing channel.

[0116] As an embodiment, the perception channel is used to transmit a perception signal.

[0117] As an embodiment, the sensing channel is dynamically configured.

[0118] As an embodiment, the sensing channel is semi-statically configured.

[0119] As an embodiment, the second time-frequency resource set is configured for a sensing signal.

[0120] As an embodiment, the sensing signal is used for positioning.

[0121] As an embodiment, the perception signal is PRS (Positioning RS).

[0122] As an embodiment, the perception signal is a perception reference signal.

[0123] As an embodiment, the perception signal adopts a perception waveform.

[0124] As an embodiment, the perception signal adopts a frequency modulated wave.

[0125] As an embodiment, the time-frequency resources occupied by the sensing signal are pre-configured.

[0126] As an embodiment, the time-frequency resources occupied by the sensing signal are dynamically activated.

[0127] As an embodiment, the sensing signal is an IRS (ISAC Reference Signal).

[0128] As an embodiment, the sensing signal is an ISAC sensing signal.

[0129] As an embodiment, the sensing signal is an ISAC sensing reference signal.

[0130] As an embodiment, the sensing signal is an ISAC reference signal.

[0131] As an embodiment, the sensing signal is a frequency-swept signal.

[0132] As an embodiment, the sensing signal is a chirp signal.

[0133] As an embodiment, the sensing signal is a special frequency modulation signal.

[0134] As an embodiment, the sensing signal is a linear frequency modulation pulse signal.

[0135] As an embodiment, the physical random access channel refers to the channel dedicated to the Preamble.

[0136] As an embodiment, the definition of the physical random access channel refers to the legacy PRACH.

[0137] As an embodiment, the legacy PRACH is the PRACH before and including 3GPP R18.

[0138] As an embodiment, the legacy PRACH is the PRACH before and including 3GPP R18.

[0139] According to one aspect of the present application, it is characterized in that the second candidate signal adopts a first sensing waveform, and the first sensing waveform is a single-frequency wave.

[0140] As an embodiment, the frequency of the single-frequency wave does not change with time.

[0141] As an embodiment, the single-frequency wave is a single-frequency continuous wave cos(2πft), where f is the frequency of the single-frequency wave and t is time.

[0142] According to one aspect of the present application, it is characterized in that the second candidate signal adopts a first sensing waveform, and the first sensing waveform is a frequency modulation wave.

[0143] As an embodiment, the frequency modulation wave is such that the frequency changes with time.

[0144] As an embodiment, the frequency modulation wave is a Frequency Modulated Continuous Wave (FMCW).

[0145] As an embodiment, the frequency modulation wave is a Linear Frequency Modulated Continuous Wave.

[0146] As an embodiment, the frequency modulation wave is a Sawtooth Linear Frequency Modulated Continuous Wave.

[0147] As an embodiment, the frequency modulation wave is a Triangular Linear Frequency Modulated Continuous Wave.

[0148] As an embodiment, the frequency modulation wave is a Segmental Linear Frequency Modulated Continuous Wave.

[0149] As an embodiment, the frequency modulation wave is FMCW, and the Chirp of the FMCW is

[0150] As an embodiment, the frequency modulation wave is FMCW, and the Chirp of the FMCW is e jπ(βt+ω)t / τ 。

[0151] As an embodiment, the second candidate signal adopts a first sensing waveform, and the first sensing waveform is a frequency modulation wave; the second candidate signal includes N1 Chirps.

[0152] As an embodiment, the second candidate signal adopts a first sensing waveform, and the first sensing waveform is a frequency modulation wave; the second candidate signal is composed of N1 Chirps.

[0153] As an embodiment, N1 is 1.

[0154] As an embodiment, N1 is greater than 1.

[0155] As an embodiment, N1 is configurable.

[0156] As an embodiment, N1 is determined by the first node.

[0157] As an embodiment, the N1 Chirps are continuous in time.

[0158] As an embodiment, the N1 Chirps are non-continuous in time.

[0159] As an embodiment, the N1 Chirps are equally spaced in time.

[0160] As an embodiment, the frequency of each Chirp in the N1 Chirps increases linearly with time.

[0161] As an embodiment, the N1 Chirps are N1 repetitions of the same Chirp.

[0162] As an embodiment, the duration of each Chirp in the N1 Chirps is configurable.

[0163] As an embodiment, the duration of each Chirp in the N1 Chirps is determined by the first node.

[0164] As an embodiment, the duration of each Chirp in the N1 Chirps is related to the first node.

[0165] As an embodiment, the duration of each Chirp in the N1 Chirps is related to the parameters of the first node.

[0166] As an embodiment, the duration of each Chirp in the N1 Chirps is related to the hardware of the first node.

[0167] According to one aspect of the present application, it is characterized in that whether the first signal is the first candidate signal or the second candidate signal depends on whether the first random access process is CFRA or CBRA; at least when the first random access process is CFRA, the first signal is the second candidate signal.

[0168] As an embodiment, if the first random access procedure is CBRA, the first signal is the first candidate signal.

[0169] As an embodiment, when at least the first random access procedure is CFRA, the first signal is the second candidate signal.

[0170] According to one aspect of the present application, it is characterized in that whether the first signal is the first candidate signal or the second candidate signal depends on the purpose of the first random access process; if the purpose of the first random access process is one of the purposes in the first candidate purpose set, the first signal is the first candidate signal; if the purpose of the first random access process is one of the purposes in the second candidate purpose set, the first signal is the second candidate signal; the first candidate purpose set and the second candidate purpose set are different.

[0171] As an embodiment, the first candidate destination set includes at least initial access, and the second candidate destination set includes at least BFR.

[0172] As an embodiment, the purpose of the first random access process is BFR; the first signal is the second candidate signal.

[0173] As a sub-embodiment of the above embodiment, the first signal is associated with at least one candidate RS resource; the at least one candidate RS resource is an SSB resource or a CSI-RS resource.

[0174] As a sub-embodiment of the above embodiment, the second time-frequency resource set is configured by a BeamFailureRecoveryConfig IE.

[0175] As a sub-embodiment of the above embodiment, the second time-frequency resource set is configured by an RRC IE whose name includes BeamFailureRecovery.

[0176] As an embodiment, whether the first signal is the first candidate signal or the second candidate signal depends on whether the first random access procedure is CFRA or CBRA, and whether the first signal is the first candidate signal or the second candidate signal depends on the purpose of the first random access procedure.

[0177] As an embodiment, if the purpose of the first random access procedure is not one of the purposes in the second candidate purpose set or the first random access procedure is not CFRA, the first signal is the first candidate signal.

[0178] As an embodiment, when the purpose of at least the first random access process is one of the second candidate purpose set and the first random access process is CFRA, the first signal is the second candidate signal; otherwise, the first signal is the first candidate signal.

[0179] As an embodiment, the purpose of the first random access process is BFR, the first random access process is CFRA; and the first signal is the second candidate signal.

[0180] According to one aspect of the present application, it is characterized by comprising:

[0181] The first transmitter sends a second signal during the first random access process;

[0182] The first processor, in response to expiration of the second time window, increments the random access transmission counter;

[0183] The start time of the second time window depends on the sending of the second signal; the first signal is the first candidate signal, and the second signal is the second candidate signal.

[0184] As an embodiment, in response to the random access sending counter reaching a second preset threshold, the second signal is sent during the first random access process; the second preset threshold is not greater than the first preset threshold.

[0185] As an embodiment, the second preset threshold is smaller than the first preset threshold.

[0186] As an embodiment, the first preset threshold is preambleTransMax+1.

[0187] As an embodiment, the second preset threshold is the first value + 1; the name of the RRC signaling for configuring the first value includes TransMax.

[0188] As an embodiment, in the first random access procedure, RA_TYPE is not set to 2-stepRA.

[0189] As an embodiment, the transmission power of the first signal depends on the first counter; the transmission power of the second signal does not depend on the first counter.

[0190] As an embodiment, the transmission power of the first signal depends on the first counter, including: before the first signal is sent, determining that the first counter is executed.

[0191] As an embodiment, the transmission power of the second signal is independent of the first counter, including: before the second signal is sent, determining that the first counter is not executed.

[0192] As an embodiment, determining the first counter means: increasing the first counter by 1.

[0193] As an example, the determination of the first counter means: determining whether the first counter is incremented by 1.

[0194] As an example, the determination that the first counter is not executed depends on the second signal being the second candidate signal.

[0195] As an example, as long as the second signal is the second candidate signal, the first counter is not executed.

[0196] As an example, the determination that the first counter is executed depends on the first signal being the Preamble.

[0197] According to one aspect of the present application, it is characterized in that: the transmission power of the first signal depends on the first counter; the transmission power of the second signal depends on the second counter; the first counter and the second counter are different.

[0198] As an example, the first counter is a PREAMBLE_POWER_RAMPING_COUNTER, and the second counter is another PREAMBLE_POWER_RAMPING_COUNTER.

[0199] As an example, the first counter is a PREAMBLE_POWER_RAMPING_COUNTER, and the second counter is not a PREAMBLE_POWER_RAMPING_COUNTER.

[0200] According to one aspect of the present application, it is characterized in that it includes: the first receiver, which receives an RRC message, and the RRC message configures the second time-frequency resource set; wherein, the RRC message includes a first field, and the first field indicates that the second time-frequency resource set is used for random access.

[0201] As an example, the RRC message is received before the first node sends the first signal.

[0202] As an example, the RRC message is transmitted through a DCCH (Dedicated Control Channel).

[0203] As an example, the RRC message is an RRCReconfiguration message.

[0204] As an example, the RRC message is transmitted through a BCCH (Broadcast Control Channel).

[0205] As an embodiment, the RRC message is a SIB1 (System Information Block 1) message.

[0206] As an embodiment, the first signal may be the second candidate signal only when the RRC message includes the first domain.

[0207] To solve the above technical problems, an embodiment of the present invention further provides a network device, comprising a memory and a processor, wherein the memory stores computer instructions that can be run on the processor, and the processor executes the steps of the above method when running the computer instructions.

[0208] To solve the above technical problems, the present application discloses a method used in a second node of wireless communication, characterized in that it includes: receiving a first signal in a first random access process, the type of the first random access process is four-step random access; the first signal is any one of a first candidate signal and a second candidate signal; wherein the sender of the first signal increases a random access sending counter in response to the expiration of a first time window; the start of the first time window depends on the sending of the first signal by the sender of the first signal; the first candidate signal only occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal only occupies time-frequency resources in a second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0209] According to one aspect of the present application, it is characterized in that the second candidate signal adopts a first perception waveform, and the first perception waveform is a frequency modulated wave.

[0210] According to one aspect of the present application, it is characterized in that whether the first signal is the first candidate signal or the second candidate signal depends on whether the first random access process is CFRA or CBRA; at least when the first random access process is CFRA, the first signal is the second candidate signal.

[0211] According to one aspect of the present application, it is characterized in that whether the first signal is the first candidate signal or the second candidate signal depends on the purpose of the first random access process; if the purpose of the first random access process is one of the purposes in the first candidate purpose set, the first signal is the first candidate signal; if the purpose of the first random access process is one of the purposes in the second candidate purpose set, the first signal is the second candidate signal; the first candidate purpose set and the second candidate purpose set are different.

[0212] According to one aspect of the present application, it is characterized in that the method in the second node further includes: receiving a second signal during the first random access procedure; the sender of the second signal increases the random access transmission counter in response to the expiration of a second time window; wherein, the start time of the second time window depends on the transmission of the second signal; the first signal is the first candidate signal, and the second signal is the second candidate signal.

[0213] In one embodiment, when the first signal is the first candidate signal, a second signal is received during the first random access procedure; the second signal is the second candidate signal; the sender of the first signal increases the random access transmission counter in response to not receiving an expected feedback message within a second time window; wherein, the start time of the second time window depends on the transmission of the second signal.

[0214] According to one aspect of the present application, it is characterized in that the transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; the first counter and the second counter are different.

[0215] According to one aspect of the present application, it is characterized in that the method in the second node further includes: sending an RRC message, and the RRC message configures the second time-frequency resource set; wherein, the RRC message includes a first field, and the first field indicates that the second time-frequency resource set is used for random access.

[0216] As an embodiment, compared with the traditional solution, the second node has the opportunity to receive either the first candidate signal or the second candidate signal among the first signals, expanding the application scenarios for initiating the random access procedure; when the sender of the first signal waits for a feedback message after reception at the second node within the first time window and fails, the sender of the first signal can accumulate the number of random access procedure failures based on the random access transmission counter, avoiding the situation where random access procedures can be initiated for both the first candidate signal and the second candidate signal and the access procedure fails, thereby achieving the technical effect of enhancing the random access procedure, greatly improving the random access performance, and being beneficial to improving the system efficiency.

[0217] The present application discloses a first node for use in wireless communication, comprising: a first transmitter that transmits a first signal during a first random access procedure, wherein the type of the first random access procedure is a four-step random access; a first processor that increments a random access transmission counter in response to the expiration of a first time window; wherein the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0218] As an embodiment, the first node comprises: a first transmitter and a first processor. The first transmitter is adapted to transmit a first signal during a first random access procedure, wherein the type of the first random access procedure is a four-step random access; the first processor increments a random access transmission counter in response to the expiration of a first time window; wherein the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0219] According to one aspect of the present application, it is characterized in that the first node is an Internet of Things terminal; or the first node is a relay; or the first node is a U2N remote UE; or the first node is a vehicle-mounted terminal; or the first node is an aircraft; or the first node is a mobile phone; or alternatively, the first node is a communication terminal supporting multi-SIM card communication.

[0220] The present application discloses a second node for use in wireless communication, comprising: a second receiver that receives a first signal during a first random access procedure, wherein the type of the first random access procedure is a four-step random access; the first signal is either a first candidate signal or a second candidate signal; wherein the sender of the first signal increments a random access transmission counter in response to the expiration of a first time window; the start of the first time window depends on the transmission of the first signal by the sender of the first signal; the first candidate signal only occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal only occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0221] In order to solve the above technical problems, an embodiment of the present invention further provides a storage medium on which computer instructions are stored. When the computer instructions are executed, the steps of the above method are executed.

[0222] To solve the above technical problems, an embodiment of the present invention further provides a terminal, comprising a memory and a processor, wherein the memory stores computer instructions that can be run on the processor, and the processor executes the steps of the above method when running the computer instructions.

[0223] According to one aspect of the present application, it is characterized in that the second node is a base station; or, the second node is an access point; or, the second node is an aircraft; or, the second node is a satellite.

[0224] The present application discloses a first node used for wireless communication, comprising: a first transmitter, transmitting a first signal in a first random access process, wherein the type of the first random access process is four-step random access; a first processor, increasing a random access transmission counter in response to expiration of a first time window; wherein the start of the first time window depends on the transmission of the first signal; the first signal adopts a first perception waveform, which is a frequency-modulated wave.

[0225] As an embodiment, the problems to be solved by this application include: how to enhance the random access process, increase the random access success rate, and improve the random access performance.

[0226] As an embodiment, the technical problem to be solved by the present application also includes: how to avoid erroneous statistics of the number of random access failures and improve system performance.

[0227] As an embodiment, this technical solution adopts the first perception waveform to initiate the random access process instead of the legacy Preamble, which expands the application scenarios of initiating the random access process, is conducive to shortening the delay of the random access process and improving the success probability of random access; at the same time, the random access sending counter accumulates the number of times the perception waveform signal is used, thereby achieving the technical effect of enhancing the random access process, greatly improving the random access performance, and improving the system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0228] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0229] Figure 1 shows a basic flow chart of a first node U1 and a second node N2 according to one embodiment of the present application;

[0230] Figure 2Shows a schematic diagram of a network architecture according to an embodiment of the present application;

[0231] Figure 3 Shows a schematic diagram of an embodiment of a radio protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0232] Figure 4 Shows a schematic diagram of a first node device and a second node device according to an embodiment of the present application;

[0233] Figure 5 Shows a flowchart of wireless signal transmission according to an embodiment of the present application;

[0234] Figure 6 Shows a typical signaling interaction flowchart according to an embodiment of the present application;

[0235] Figure 7 Shows another typical signaling interaction flowchart according to an embodiment of the present application;

[0236] Figure 8 Shows another basic flowchart of a first node U1 and a second node N2 in an embodiment of the present application;

[0237] Figure 9 Illustrates a schematic diagram of a processing device in a first node according to an embodiment of the present application;

[0238] Figure 10 Illustrates a schematic diagram of a processing device in a second node according to an embodiment of the present application.

[0239] Embodiment

[0240] The technical solution of the present application will be further described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily. In the drawings, each box represents a step. In particular, it should be emphasized that the order of the boxes in the figure does not represent the chronological order of the steps represented.

[0241] Example 1

[0242] Figure 1 Shows the basic flowchart of a first node U1 and a second node N2 in an embodiment of the present application. Among them, the first node U1 can be various terminal devices such as a UE, and the second node N2 can be various network-side devices including but not limited to a base station, especially including an NR base station. Taking Figure 1 as an example, the second node N2 can be the serving cell maintaining base station of the first node U1.

[0243] refer to Figure 1 In step S101, the first node U1 sends a first signal in a first random access procedure, where the type of the first random access procedure is four-step random access; in step S102, in response to expiration of a first time window, the first node U1 increases a random access transmission counter;

[0244] The start of the first time window depends on the sending of the first signal; the first signal is any one of the first candidate signal and the second candidate signal; the first candidate signal occupies the time-frequency resources in the first time-frequency resource set, and the second candidate signal occupies the time-frequency resources in the second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

[0245] Specifically, in step S101, the first node U1 initiates a random access process by sending a first signal, namely the first random access process. The first random access process is a four-step random access process including a contention-based random access process CBRA and a non-contention-based random access process CFRA.

[0246] In one embodiment, the first signal is any one of a first candidate signal and a second candidate signal.

[0247] In one embodiment, both the first candidate signal and the second candidate signal can serve as random access request signals for initiating a random access procedure. The first candidate signal can occupy time-frequency resources in a first time-frequency resource set, and the first time-frequency resource set is used only for PRACH. In other words, the time-frequency resources in the first time-frequency resource set are dedicated resources, used only by user equipment, such as the first node, to initiate a random access procedure. The time-frequency resources in the first time-frequency resource set have a one-to-one correspondence with random access opportunities.

[0248] In one embodiment, the second candidate signal occupies time-frequency resources in a second time-frequency resource set, and the time-frequency resources in the first time-frequency resource set and the time-frequency resources in the second time-frequency resource set are different, and the two may be orthogonal or partially overlap. The second time-frequency resource set is not configured for PRACH. The second time-frequency resource set is not for PRACH. In other words, the second time-frequency resource set is used for non-PRACH channels. However, in certain opportunities or scenarios, sending the second candidate signal can replace sending a signal on PRACH, thereby completing the random access process.

[0249] In a possible implementation, when the first node intends to initiate random access, if the second candidate signal is suitable as a random access request signal, the first node U1 may use the second candidate signal as the first signal to initiate CFRA. If the second candidate signal is not suitable as a random access request signal, the first node U1 may use the first candidate signal as the first signal to initiate CBRA.

[0250] In another possible implementation, the first node U1 may use the second candidate signal as the first signal and send the second candidate signal in the time-frequency resource of the second candidate signal to achieve the purpose of initiating CFRA random access.

[0251] In the traditional solution, only the random access sequence (such as preamble) can be used as a random access request signal. The random access sequence may use the time-frequency resources in the first time-frequency resource set and be sent on the PRACH channel. In a possible implementation, the first candidate signal is a preamble and uses the time-frequency resources in the first time-frequency resource set; the second candidate signal is a non-preamble signal and uses the time-frequency resources in the second time-frequency resource set. In an example, the non-Preamble signal is an ISAC sensing signal (Chirp); alternatively, the non-Preamble signal is defined as a PRACH resource set. The signals for initiating a random access request include preamble and non-preamble, and adding the non-preamble random access request signal is beneficial to reducing random access conflicts and increasing the random access success probability.

[0252] In one embodiment, the first candidate signal is used to initiate a random access procedure. In yet another embodiment, the first candidate signal is indexed by ra-PreambleIndex. As yet another embodiment, the first candidate signal is a Random Access Preamble. As yet another embodiment, the first candidate signal is a Preamble.

[0253] The time and location at which the first node U1 sends the first candidate signal are jointly determined by the PRACH configuration index (configuration Index parameter) and the uplink / downlink subframe configuration UL / DL configuration parameter. The UL / DL configuration parameter comes from the RRC layer message.

[0254] After step S101, the first node U1 sets the first time window, or the first node U1 opens the first time window. Within the first time window, the first node U1 waits to receive a feedback message (not shown in the figure) from the second node N2. If the first node does not receive the relevant feedback message within the first time window, then step S102 is executed.

[0255] In step S102, in response to the expiration of the first time window, the first node U1 may increase the value of the random access transmission counter. The value of the random access transmission counter increases with the number of transmissions of the first signal.

[0256] In one embodiment, the random access transmission counter may be a counter that records the number of times the random access process is initiated. For example, the random access transmission counter may be a counter for the failure of the random access process.

[0257] In a sub - embodiment, the random access transmission counter may be a random access request transmission counter. For example, it may be a random access sequence transmission counter, or it may be a preamble transmission counter, or PREAMBLE_TRANSMISSION_COUNTER may also be used.

[0258] Specifically, the random access transmission counter may count the number of transmissions of the first signal, that is, count the number of transmissions of the first candidate signal and the second candidate signal.

[0259] In a possible implementation, the random access transmission counter may independently count the number of transmissions of the first candidate signal and the number of transmissions of the second candidate signal.

[0260] In another possible implementation, the random access transmission counter may count the sum of the number of transmissions of the first candidate signal and the number of transmissions of the second candidate signal.

[0261] For example, taking the first candidate signal as the preamble, the random access transmission counter may count the number of preamble transmissions and the number of non - preamble signal transmissions in a random access process. The number of preamble transmissions and the number of non - preamble signal transmissions may be counted using independent random access transmission counters.

[0262] For another example, taking the first candidate signal as preamble and the random access transmission counter as PREAMBLE_TRANSMISSION_COUNTER, PREAMBLE_TRANSMISSION_COUNTER can count the Preamble and non-Preamble signals that can be sent during a random access process; or, non-Preamble signals and Preamble are counted using independent PREAMBLE_POWER_RAMPING_COUNTER.

[0263] In one embodiment, the first time window is an RAR window; or, the first time window is an RA-ResponseWindow. As an embodiment, in the first time window, a PDCCH scrambled by a C-RNTI is monitored; or, in the first time window, a PDCCH scrambled by an RA-RNTI is monitored; or, in the first time window, a PDCCH scrambled by a C-RNTI or RA-RNTI is monitored.

[0264] As yet another embodiment, in the first time window, a PDCCH scrambled by a sensing RNTI is monitored; and the first signal is the second candidate signal.

[0265] As an embodiment, the start of the first time window being dependent on the transmission of the first signal means: the first time window is started at least after the last symbol of the first signal is transmitted. Alternatively, the start of the first time window being dependent on the transmission of the first signal means: the first time window is started at the first PDCCH opportunity after the first signal is transmitted. Alternatively, the start of the first time window being dependent on the transmission of the first signal means: the first time window is started at the first symbol after the first signal is transmitted.

[0266] As an embodiment, the start of the first time window depends on the sending of the first signal, which means that the first time window starts with the first symbol of the earliest CORESET of the Type1-PDCCH CSS set configured to the first node for receiving PDCCH after the first signal is sent.

[0267] As an embodiment, the start of the first time window depends on the sending of the first signal, which means: the first time window starts at the K1th symbol after the first signal is sent; and K1 is greater than 1.

[0268] As an embodiment, the first signal being sent means that the last symbol of the first signal is sent.

[0269] As an embodiment, the sending of the first signal means the end of the sending of the first signal.

[0270] As an embodiment, the sending of the first signal means the start of the sending of the first signal.

[0271] As an embodiment, the start of the first time window depends on the sending of the first signal, and the start of the first time window depends on whether the first signal is the first candidate signal or the second candidate signal.

[0272] As a sub - embodiment of the above - mentioned embodiment, if the first signal is the first candidate signal, the first time window starts at the first PDCCH opportunity after the first signal is sent; if the first signal is the second candidate signal, the first time window starts when the first signal starts to be sent.

[0273] As a sub - embodiment of the above - mentioned embodiment, if the first signal is the first candidate signal, the first time window starts at the first PDCCH opportunity after the first signal is sent; if the first signal is the second candidate signal, the first time window starts at the K1 - th symbol after the first signal is sent; K1 is greater than 1.

[0274] As an embodiment, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. Regardless of whether the first signal is the first candidate signal or the second candidate signal, in response to the expiration of the first time window, increase PREAMBLE_TRANSMISSION_COUNTER.

[0275] As an embodiment, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. In response to the expiration of the first time window, increase PREAMBLE_TRANSMISSION_COUNTER; the first signal is the first candidate signal.

[0276] As an embodiment, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. In response to the expiration of the first time window, increase PREAMBLE_TRANSMISSION_COUNTER; the first signal is the second candidate signal.

[0277] Example 2

[0278] Embodiment 2 exemplifies a schematic diagram of a network architecture according to the present application, as shown in the appendix Figure 2As shown. Figure 2A diagram illustrates a network architecture 200 for 5G NR, LTE (Long-Term Evolution), and LTE-A (Long-Term Evolution Advanced) systems. The 5G NR or LTE network architecture 200 may be referred to as a 5G System (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, an NG-RAN (Next Generation Radio Access Network) 202, a 5G Core Network (5G Core Network) / EPC (Evolved Packet Core) 210, a Home Subscriber Server (HSS) / Unified Data Management (UDM) 220, and Internet services 230. The 5GS / EPS may interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As shown, the 5GS / EPS provides packet-switched services. However, those skilled in the art will readily appreciate that the various concepts presented throughout this disclosure can be extended to networks providing circuit-switched services or other cellular networks. The NG-RAN includes NR / evolved Node B (gNB / eNB) 203 and other gNBs (eNBs) 204. The gNB (eNB) 203 provides user and control plane protocol termination towards the UE 201. The gNB (eNB) 203 can be connected to other gNBs (eNBs) 204 via an Xn / X2 interface (e.g., backhaul). The gNB (eNB) 203 may also be referred to as a base station, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), TRP (transmitter receive node), or some other appropriate terminology. The gNB (eNB) 203 provides an access point to the 5GC / EPC 210 for the UE 201. Examples of UE 201 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop computer, a personal digital assistant (PDA), a satellite radio, non-terrestrial base station communications, satellite mobile communications, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a drone, an aircraft, a narrowband Internet of Things device, a machine type communication device, a land vehicle, an automobile, a wearable device, or any other similarly functional device.Those skilled in the art may also refer to the UE 201 as a mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology. The gNB (eNB) 203 is connected to the 5GC / EPC 210 via the S1 / NG interface. The 5GC / EPC 210 includes an MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MMEs / AMFs / SMFs 214, an S-GW (Service Gateway) / UPF (User Plane Function) 212, and a P-GW (Packet Data Network Gateway) / UPF 213. MME / AMF / SMF211 is the control node that handles signaling between UE201 and 5GC / EPC210. Generally, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which itself is connected to P-GW / UPF213. P-GW provides UE IP address allocation and other functions. P-GW / UPF213 is connected to Internet services 230. Internet services 230 include operator-specific Internet protocol services, which may specifically include the Internet, intranet, IMS (IP Multimedia Subsystem) and packet-switched streaming services.

[0279] As an embodiment, the UE201 corresponds to the first node (first node device) in this application.

[0280] As an embodiment, the gNB (eNB) 201 corresponds to the second node (second node device) in this application.

[0281] Example 3

[0282] Example 3 shows a schematic diagram of an embodiment of a wireless protocol architecture of a user plane and a control plane according to the present application, as shown in the attached figure. Figure 3 shown. Figure 3is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture of the control plane 300 for a first node device (UE or gNB) and a second node device (gNB or UE) is shown using three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to herein as PHY 301. Layer 2 (L2 layer) 305 sits above PHY 301 and is responsible for the link between the first and second node devices via PHY 301. L2 layer 305 includes the MAC (Medium Access Control) sublayer 302, the RLC (Radio Link Control) sublayer 303, and the PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node device. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by encrypting data packets and supports handover of the first node device between the second node devices. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between first node devices. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the second node device and the first node device. The radio protocol architecture of the user plane 350 includes Layer 1 (L1) and Layer 2 (L2). The radio protocol architecture for the first and second node devices in the user plane 350 is substantially identical to the corresponding layers and sublayers in the control plane 300, including the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355. However, the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 also includes the SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping QoS flows to data radio bearers (DRBs) to support service diversity.Although not illustrated, the first node device may have several upper layers above the L2 layer 355, including a network layer (e.g., IP layer) that terminates at the P-GW on the network side and an application layer that terminates at the other end of the connection (e.g., a remote UE, a server, etc.).

[0283] As an example, Figure 3 the wireless protocol architecture in

[0284] As an example, Figure 3 the wireless protocol architecture in

[0285] Example 4

[0286] Embodiment 4 shows a schematic diagram of the first node device and the second node device according to an embodiment of the present application, as Figure 4 shown.

[0287] In the first node device (450), a controller / processor 490, a data source / buffer 480, a receiving processor 452, a transmitter / receiver 456, and a transmitting processor 455 may be included. The transmitter / receiver 456 includes an antenna 460.

[0288] In the second node device (410), a controller / processor 440, a data source / buffer 430, a receiving processor 412, a transmitter / receiver 416, and a transmitting processor 415 may be included. The transmitter / receiver 416 includes an antenna 420.

[0289] In the DL (Downlink), higher-layer packets, such as the higher-layer information included in the RRC messages in this application, are provided to the controller / processor 440. The controller / processor 440 implements the functions of the L2 layer and above. In the DL, the controller / processor 440 provides packet header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first node device 450 based on various priority metrics. The controller / processor 440 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the first node device 450. For example, the higher-layer information included in the RRC messages in this application is generated in the controller / processor 440. The transmit processor 415 implements various signal processing functions for the L1 layer (i.e., the physical layer), including coding, interleaving, scrambling, modulation, power control / allocation, precoding, and physical layer control signaling generation. For example, the generation of the physical layer signal carrying the RRC messages in this application is completed by the transmit processor 415. The generated modulated symbols are divided into parallel streams and each stream is mapped to a corresponding multi-carrier subcarrier and / or multi-carrier symbol. The symbols are then mapped by the transmit processor 415 to the antenna 420 via the transmitter 416 and transmitted in the form of a radio frequency signal. At the receiving end, each receiver 456 receives the radio frequency signal through its corresponding antenna 460, and each receiver 456 recovers the baseband information modulated onto the radio frequency carrier and provides the baseband information to the receive processor 452. The receive processor 452 implements various signal reception processing functions of the L1 layer. The signal reception processing function includes receiving the first signal in the present application, demodulating the multi-carrier symbols in the multi-carrier symbol stream based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK)), and then descrambling, decoding, and deinterleaving to recover the data or control transmitted by the second node device 410 on the physical channel, and then providing the data and control signals to the controller / processor 490. The controller / processor 490 is responsible for L2 layers and above. The controller / processor 490 interprets the high-level information included in the RRC messages in this application. The controller / processor may be associated with the memory 480 that stores program codes and data. The memory 480 may be referred to as a computer-readable medium.

[0290] In the uplink (UL) transmission, similar to the downlink transmission, after the high-layer information is generated by the controller / processor 490, the transmitting processor 455 performs various signal transmission processing functions for the L1 layer (i.e., the physical layer). The generation of the first signal is completed by the transmitting processor 455, and then the transmitting processor 455 maps it to the antenna 460 via the transmitter 456 and transmits it in the form of a radio frequency signal. The receiver 416 receives the radio frequency signal through its corresponding antenna 420. Each receiver 416 recovers the baseband information modulated on the radio frequency carrier and provides the baseband information to the receiving processor 412. The receiving processor 412 performs various signal reception processing functions for the L1 layer (i.e., the physical layer), including receiving and processing various possible physical layer signals, and then provides the data and / or control signals to the controller / processor 440. The controller / processor 440 performs the functions of the L2 layer, including interpreting the high-layer information, including the high-layer information carried by the RRC message. The controller / processor may be associated with a buffer 430 that stores program code and data. The buffer 430 is a computer-readable medium.

[0291] As an embodiment, the first node device 450 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The first node device 450 at least: sends a first signal during a first random access procedure, the type of the first random access procedure being a four-step random access; increases a random access transmission counter in response to the expiration of a first time window; wherein the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

[0292] As an embodiment, the first node device 450 apparatus includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generating an action when executed by at least one processor, the action including: sending a first signal in a first random access process, the type of the first random access process being four-step random access; increasing a random access sending counter as a response to the expiration of a first time window; wherein the start of the first time window depends on the sending of the first signal; the first signal is any one of a first candidate signal and a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0293] As an embodiment, the second node device 410 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second node device 410 apparatus at least: receives a first signal in a first random access process, the type of the first random access process is four-step random access; the first signal is any one of a first candidate signal and a second candidate signal; wherein the sender of the first signal increases a random access transmission counter in response to the expiration of a first time window; the start of the first time window depends on the sender of the first signal transmitting the first signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0294] As an embodiment, the second node device 410 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generates actions when executed by at least one processor, the actions including: receiving a first signal in a first random access process, the type of the first random access process being four-step random access; the first signal is any one of a first candidate signal and a second candidate signal; wherein the sender of the first signal increases a random access sending counter in response to the expiration of a first time window; the start of the first time window depends on the sending of the first signal by the sender of the first signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0295] As an embodiment, the first node device 450 is a user equipment (UE).

[0296] As an embodiment, the second node device 410 is a base station device (gNB / eNB).

[0297] As an embodiment, the receiver 456 (including the antenna 460), the receiving processor 452 and the controller / processor 490 are used to receive the RRC message in this application.

[0298] As an embodiment, the transmitter 456 (including the antenna 460), the transmit processor 455 and the controller / processor 490 are used to transmit the first signal in the present application.

[0299] As an embodiment, the transmitter 416 (including the antenna 420), the transmit processor 415 and the controller / processor 440 are used to transmit the RRC message described in this application.

[0300] As an embodiment, the receiver 416 (including the antenna 420 ), the receiving processor 412 and the controller / processor 440 are used to receive the first signal in this application.

[0301] Example 5

[0302] Example 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, such as Figure 5 As shown. Figure 5 In the example, the second node (device) N2 is a base station maintaining the serving cell of the first node (device) U1. It should be noted that the order in this example does not limit the signal transmission order and implementation order in this application.

[0303] For the second node N2, in step S501, a first signal is received in a first random access procedure, where the type of the first random access procedure is four-step random access.

[0304] For the first node U1, in step S552, a first signal is sent in a first random access procedure, where the type of the first random access procedure is four-step random access; in step S553, as a response to the expiration of the first time window, a random access sending counter is increased.

[0305] In embodiment 5, the start of the first time window depends on the sending of the first signal; the first signal is any one of the first candidate signal and the second candidate signal; the first candidate signal occupies the time-frequency resources in the first time-frequency resource set, and the second candidate signal occupies the time-frequency resources in the second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

[0306] Specifically, in step S552, the first node U1 initiates a random access process by sending a first signal, namely the first random access process. The first random access process is a four-step random access process, including a contention-based random access process CBRA and a non-contention-based random access process CFRA, which will not be described in detail here.

[0307] In one embodiment, the first signal is any one of a first candidate signal and a second candidate signal.

[0308] In one embodiment, the first node U1 may determine that the random access request signal is the first candidate signal or the second candidate signal based on the time-frequency resource corresponding to the first candidate signal or the second candidate signal. The time-frequency resource corresponding to the first candidate signal or the second candidate signal may be default, predefined, or preconfigured.

[0309] Specifically, as an optional manner, the second node N2 may perform step S500 before step S501, i.e., send an RRC message to the first node U1. The RRC message may be used to configure the second set of time-frequency resources. The second set of time-frequency resources serves as the time-frequency resources of the second candidate signal and is used to transmit the second candidate signal.

[0310] In a possible implementation manner, the time-frequency resources and sending timing of the second candidate signal and its ability to serve as a random access request signal are configured to the first node U1 by higher layer signaling, for example, through an RRC message.

[0311] In a possible implementation, the correspondence between the second candidate signal and the time-frequency resource transmitting the second candidate signal is pre-configured; for example, there is a one-to-one mapping relationship between the second candidate signal and the time-frequency resource transmitting the second candidate signal; or, there is a certain correspondence between the second candidate signal and the time-frequency resource transmitting the second candidate signal. This correspondence can be sent through a high-layer signaling such as an RRC message. Taking step S500 as an example, the second node N2 sends the relevant configuration in the RRC message in step S500.

[0312] After the first node U1 receives the RRC message in step S551. Subsequently, the first node U1 can know the timing of transmitting the second candidate signal and the set of available second time-frequency resources. When the second node N2 carries the set of second time-frequency resources where the second candidate signal is located in the RRC message, it can also indicate that the second candidate signal can be used as the random access request signal to initiate random access.

[0313] After the first node U1 receives the RRC message, it can know the transmission timing and the time-frequency resource set of the second candidate signal, and that the second candidate signal can also initiate a random access procedure. It should be noted that step S500 is an optional step. For example, the communication system can pre-define the second candidate signal and the set of time-frequency resources corresponding to the second candidate signal. In this case, step S500 can be omitted. Correspondingly, the first node U1 can directly execute step S552 without there being step S551.

[0314] In step S552, the first node U1 initiates a random access procedure by sending a first signal, that is, the first random access procedure. The first random access procedure is a four-step random access, including a contention-based random access procedure CBRA and a contention-free random access procedure CFRA.

[0315] In an embodiment, both the first candidate signal and the second candidate signal can be used as the random access request signal to initiate a random access procedure. In the traditional solution, only a random access sequence (such as a preamble) can be used as the random access request signal. For example, the first candidate signal is a preamble, and the second candidate signal is a non-preamble signal. In this embodiment, adding a non-preamble random access request signal is beneficial to reducing random access conflicts and increasing the random access success probability.

[0316] Specifically, the first node U1 initiates a random access procedure based on its own requirements (such as initial access, obtaining RRC reconstruction, or accessing from RRC Inactive, etc.). In one implementation, the first node U1 can arbitrarily select the first candidate signal or the second candidate signal therefrom. In another implementation, the first node U1 can select the first candidate signal or the second candidate signal based on time-frequency resources. In another implementation, the first node U1 can determine the first candidate signal or the second candidate signal based on the type or purpose of the random access procedure. In addition, the first candidate signal or the second candidate signal can also be determined by combining any two or all of the time-frequency resources, the type of the random access procedure, and the purpose.

[0317] For example, if the first random access procedure is CBRA, the first signal is the first candidate signal. For another example, if the first random access procedure is CFRA, the first signal is the second candidate signal.

[0318] In one embodiment, whether the first signal is the first candidate signal or the second candidate signal can depend on whether the first random access procedure is CFRA or CBRA. In one possible implementation, when the first random access procedure is CFRA, the first signal is the second candidate signal. In one possible implementation, at least when the first random access procedure is CFRA, the first signal is the second candidate signal.

[0319] Specifically, in one possible implementation, when the first node desires to initiate a random access, if the second candidate signal is suitable as a random access request signal, the first node U1 can use the second candidate signal as the first signal to initiate CFRA. If the second candidate signal is not suitable as a random access request signal, the first node U1 can use the first candidate signal as the first signal to initiate CBRA.

[0320] In another possible implementation, when the first node U1 receives the RRC message, it can use the second candidate signal as the first signal and send the second candidate signal in the time-frequency resources of the second candidate signal to achieve the purpose of initiating a CFRA random access.

[0321] ​

[0322] Specifically, in a possible implementation, the first candidate destination set includes initial access, obtaining RRC reconstruction, and accessing from RRC Inactive; the second candidate destination set includes handover between cells, UE positioning, and beam failure recovery (BFR). For example, when the purpose of the first node U1 initiating a random access procedure is to initiate BFR, the first node U1 may determine a second candidate signal as the first signal, and then send the second candidate signal to perform the random access procedure. For another example, when the purpose of the first node U1 initiating a random access procedure is initial access, the first node U1 may determine a first candidate signal as the first signal, and then send the first candidate signal to perform the random access procedure.

[0323] As an embodiment, the second time-frequency resource set includes at least one sensing occasion. The sensing occasion is a Sensing Occasion (SO); alternatively, a sensing occasion occupies continuous time-domain resources and continuous frequency-domain resources.

[0324] In one embodiment, the first candidate signal is used to initiate a random access procedure. In another embodiment, the first candidate signal is indexed by ra-PreambleIndex. As another embodiment, the first candidate signal is a Random Access Preamble. As yet another embodiment, the first candidate signal is a Preamble.

[0325] In a specific implementation, the time and location at which the first node U1 may send the first candidate signal are jointly determined by the PRACH configuration index (configuration Index parameter) and the uplink / downlink subframe configuration UL / DL configuration parameter. The UL / DL configuration parameter is from the SIB1 message of the RRC layer.

[0326] In a specific implementation, the first candidate signal only occupies the time-frequency resources in the first time-frequency resource set. The time-frequency resources in the first time-frequency resource set include time domain resources and frequency domain resources; or, the time-frequency resources in the first time-frequency resource set include at least one RB; or at least one RE; or at least one RO (RACH Occasion). The time-frequency resources in the first time-frequency resource set are used as physical random access channels and are dedicated PRACH resources. Usually, the dedicated PRACH resources are only used to send preambles. In other words, the resources for sending preambles are the time-frequency resources in the first time-frequency resource set. The time-frequency resources in the first time-frequency resource set are pre-configured by the second node N2 to the first node U1. The first node U1 already knows the preamble and the corresponding time-frequency resources before initiating the random access process, and the time-frequency resources belong to the first time-frequency resource set.

[0327] In one embodiment, the second candidate signal occupies time-frequency resources in a second time-frequency resource set. The second time-frequency resource set is not configured for the PRACH. The second time-frequency resource set is not for the PRACH. In other words, the second time-frequency resource set is configured by the second node N2 to the first node U1 for other channels rather than the PRACH channel. However, in certain opportunities or scenarios, sending the second candidate signal as the first signal can replace sending a signal on the PRACH, thereby completing the random access procedure.

[0328] As an embodiment, the second time-frequency resource set and the first time-frequency resource set do not overlap, or the second time-frequency resource set and the first time-frequency resource set are orthogonal. As another embodiment, the second time-frequency resource set and the first time-frequency resource set partially overlap.

[0329] In one example, when the second time-frequency resource set and the first time-frequency resource set partially overlap, for the same node, the time-frequency resources selected by the node for sending the first candidate signal and the time-frequency resources selected for sending the second candidate signal may overlap. Taking the first node U1 as an example, when the first node U1 sends the first candidate signal and the second candidate signal, the time-frequency resources selected by the first candidate signal and the time-frequency resources selected by the second candidate signal partially overlap, then the first node U1 can determine the candidate signal to be sent based on the priority of the first candidate signal and the second candidate signal.

[0330] For example, it can be defaulted that the priority of the second candidate signal is higher than that of the first candidate signal. For another example, the first node has previously received configuration information indicating that the priority of the second candidate signal is higher than that of the first candidate signal. At this time, the first node U1 sends the second candidate signal and notifies the receiving party (such as the second node N2) that the second candidate signal sent can be used as the first signal to perform the random access process.

[0331] In one embodiment, the second candidate signal adopts a first sensing waveform. Among them, the first sensing waveform is a frequency modulation wave; or the first sensing waveform is a single-frequency continuous wave. Specifically, the first sensing waveform is FMCW.

[0332] As an embodiment, the first sensing waveform is FMCW, and the frequency of the first sensing waveform is β in the chirp of FMCW, that is, e^(jπβt^2 / τ), where t is time and τ is the duration of a single transmission of the chirp.

[0333] As another embodiment, the first sensing waveform is FMCW, and the frequency of the first sensing waveform includes β and ω in the chirp of FMCW, that is, e^(jπ(βt + ω)t / τ), where t is time and τ is the duration of a single transmission of the chirp.

[0334] As yet another embodiment, the first sensing waveform is a single-frequency continuous wave cos(2πft), and the frequency of the first sensing waveform is f.

[0335] After step S552, the first node U1 sets the first time window, or the first node U1 opens the first time window. Within the first time window, the first node U1 waits to receive a feedback message from the second node N2, and the feedback message can be a response message to the first signal. If the first node does not receive the relevant feedback message within the first time window, then step S553 is executed, that is, as a response to the expiration of the first time window, the first node U1 can increase the value of the random access transmission counter.

[0336] In one embodiment, the random access transmission counter can be a counter that records the number of times the random access process is initiated. For example, the random access transmission counter can be a counter for random access process failures.

[0337] In a sub-embodiment, the random access transmission counter can be a random access request transmission counter. For example, it can be a random access sequence transmission counter, or a preamble transmission counter, or PREAMBLE_TRANSMISSION_COUNTER can also be used.

[0338] Specifically, the random access transmission counter may count the number of transmissions of the first signal, that is, the number of transmissions of the first candidate signal and the second candidate signal. In one possible implementation, the random access transmission counter may independently count the number of transmissions of the first candidate signal and the second candidate signal; in another possible implementation, the random access transmission counter may count the sum of the number of transmissions of the first candidate signal and the second candidate signal.

[0339] For example, taking the first candidate signal as a preamble, the random access transmission counter can count the number of preamble transmissions and the number of non-preamble signal transmissions in a random access process. The number of preamble transmissions and the number of non-preamble signal transmissions can be counted using independent random access transmission counters.

[0340] For another example, taking the first candidate signal as preamble and the random access transmission counter as PREAMBLE_TRANSMISSION_COUNTER, PREAMBLE_TRANSMISSION_COUNTER can count the Preamble and non-Preamble signals that can be sent during a random access process; or, non-Preamble signals and Preamble are counted using independent PREAMBLE_POWER_RAMPING_COUNTER.

[0341] In one embodiment, the first time window is an RAR window; or, the first time window is an RA-ResponseWindow. As an embodiment, in the first time window, a PDCCH scrambled by a C-RNTI is monitored; or, in the first time window, a PDCCH scrambled by an RA-RNTI is monitored; or, in the first time window, a PDCCH scrambled by a C-RNTI or RA-RNTI is monitored.

[0342] As yet another embodiment, in the first time window, a PDCCH scrambled by a sensing RNTI is monitored; and the first signal is the second candidate signal.

[0343] As an example, the start of the first time window depending on the transmission of the first signal means that: at least after the last symbol of the first signal is transmitted, the first time window starts. Or, the start of the first time window depending on the transmission of the first signal means that: at the first PDCCH occasion after the first signal is transmitted, the first time window starts. Or, the start of the first time window depending on the transmission of the first signal means that: at the first symbol after the first signal is transmitted, the first time window starts.

[0344] As an example, the start of the first time window depending on the transmission of the first signal means that: at the first symbol of the earliest CORESET of the Type1-PDCCH CSS set configured for the first node to receive PDCCH after the first signal is transmitted, the first time window starts.

[0345] As an example, the start of the first time window depending on the transmission of the first signal means that: at the K1-th symbol after the first signal is transmitted, the first time window starts; where K1 is greater than 1.

[0346] As an example, the transmission of the first signal means the transmission of the last symbol of the first signal.

[0347] As an example, the transmission of the first signal means the end of the transmission of the first signal.

[0348] As an example, the transmission of the first signal means the start of the transmission of the first signal.

[0349] As an example, the start of the first time window depends on the transmission of the first signal, and the start of the first time window depends on whether the first signal is the first candidate signal or the second candidate signal.

[0350] As a sub-example of the above example, if the first signal is the first candidate signal, at the first PDCCH occasion after the first signal is transmitted, the first time window starts; if the first signal is the second candidate signal, at the start of the transmission of the first signal, the first time window starts.

[0351] As a sub-example of the above example, if the first signal is the first candidate signal, at the first PDCCH occasion after the first signal is transmitted, the first time window starts; if the first signal is the second candidate signal, at the K1-th symbol after the first signal is transmitted, the first time window starts; where K1 is greater than 1.

[0352] As an example, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. Regardless of whether the first signal is the first candidate signal or the second candidate signal, in response to the expiration of the first time window, increment PREAMBLE_TRANSMISSION_COUNTER.

[0353] As an example, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. In response to the expiration of the first time window, increment PREAMBLE_TRANSMISSION_COUNTER; the first signal is the first candidate signal.

[0354] As an example, the random access transmission counter may be PREAMBLE_TRANSMISSION_COUNTER. In response to the expiration of the first time window, increment PREAMBLE_TRANSMISSION_COUNTER; the first signal is the second candidate signal.

[0355] Furthermore, in an example, when the random access transmission counter has not reached a first preset threshold, the first node U1 may continue to perform the first random access procedure.

[0356] In a specific implementation, continue to refer to Figure 5 , the first node U1 determines a second signal, and in step S554, transmits the second signal; the second node N2 receives the second signal. After transmitting the second signal in step S554, the first node U1 sets a second time window (not shown in the figure) and waits for a feedback message from the second node N2. If no relevant feedback message is received within the second time window, in response to the expiration of the second time window, increment the value of the random access transmission counter; wherein, the start time of the second time window depends on the transmission of the second signal; the first signal may be the first candidate signal, and the second signal may be the second candidate signal. Among them, the first preset threshold may be determined in any of the following ways: default; pre-configured; default. In a possible implementation manner, the first preset threshold is preambleTransMax.

[0357] As a possible implementation manner, when determining the second signal, the first node U1 may select a suitable second signal according to the time-frequency resource sets corresponding to the first candidate signal and the second candidate signal respectively. For example, the first signal is the first candidate signal and the second signal is still the first candidate signal; or, the first signal is the second candidate signal and the second signal is the first candidate signal; or, the first signal is the first candidate signal and the second signal is the second candidate signal; or, the first signal is the second candidate signal and the second signal is still the second candidate signal.

[0358] As an embodiment, the transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; the first counter and the second counter may be different.

[0359] As an embodiment, the transmission power of the first signal depends on a first counter; the transmission power of the second signal does not depend on the first counter.

[0360] As an embodiment, that the transmission power of the first signal depends on a first counter includes: before the first signal is transmitted, determining that the first counter is executed.

[0361] As an embodiment, that the transmission power of the second signal does not depend on the first counter includes: before the second signal is transmitted, determining that the first counter is not executed.

[0362] As an embodiment, the determination of the first counter means: incrementing the first counter by 1.

[0363] As an embodiment, the determination of the first counter means: determining whether the first counter is incremented by 1.

[0364] As an embodiment, the determination that the first counter is not executed depends on the second signal being the second candidate signal.

[0365] As an embodiment, as long as the second signal is the second candidate signal, the determination that the first counter is not executed is made.

[0366] As an embodiment, the determination that the first counter is executed depends on the first signal being the Preamble.

[0367] In one embodiment, when the first signal and the second signal belong to the first candidate signal and the second candidate signal respectively, the transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; the first counter and the second counter are different. Or, when the first signal and the second signal belong to the first candidate signal or belong to the second candidate signal, the transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; the first counter and the second counter are different.

[0368] As an embodiment, when the first signal and the second signal belong to the first candidate signal or belong to the second candidate signal, the transmission powers of the first signal and the second signal depend on the same counter, such as the first counter, and this first counter counts the first signal and the second signal together.

[0369] In an example, when the first signal and the second signal are both the first candidate signals, the first counter is a power ramping counter. For example, this power ramping counter can be a preamble power ramping counter. Or, this power ramping counter can be PREAMBLE_POWER_RAMPING_COUNTER.

[0370] In an example, when the first signal and the second signal are both the second candidate signals, the first counter is a power ramping counter. For example, this power ramping counter can be a non-preamble power ramping counter; or, this power ramping counter can be PREAMBLE_POWER_RAMPING_COUNTER; or, this power ramping counter is another power ramping counter other than PREAMBLE_POWER_RAMPING_COUNTER.

[0371] In an example, when the first signal is the first candidate signal and the second signal is the second candidate signal, the first counter is a power ramping counter; the second counter is another power ramping counter.

[0372] For example, when the first signal is the first candidate signal and the second signal is the second candidate signal, the first counter is a preamble power ramping counter; the second counter is another non-preamble power ramping counter.

[0373] For example, when the first signal is a first candidate signal and the second signal is a second candidate signal, the first counter is a PREAMBLE_POWER_RAMPING_COUNTER and the second counter is another PREAMBLE_POWER_RAMPING_COUNTER.

[0374] For another example, when the first signal is a first candidate signal and the second signal is a second candidate signal, the first counter is a PREAMBLE_POWER_RAMPING_COUNTER, and the second counter is not a PREAMBLE_POWER_RAMPING_COUNTER.

[0375] Furthermore, if the random access sending counter exceeds the first preset threshold, the subsequent process is not clearly stated in the protocol, whether to continue with a new RA process, perform frequency scanning to select a cell, or even switch networks. It is decided by the baseband manufacturer on the first node U1 side.

[0376] Example 6

[0377] As a typical implementation, the first signal is the second candidate signal. In one embodiment, the second candidate signal is a non-preamble signal.

[0378] Figure 6 FIG2 shows a typical signaling interaction diagram according to an embodiment of the present application. Figure 6 The second node N2 sends an RRC message in step S600, and then the first node U1 receives the RRC message in step S661. The configuration and transmission of the RRC message can refer to Figure 5 and the RRC message described in Example 5. Then, the first node U1 sends the second candidate signal in step S662. The second candidate signal is used as the first signal to initiate a random access process. In one example, the second candidate signal is a first perception waveform, and the first perception waveform is a frequency modulated wave; or the first perception waveform is a single frequency continuous wave. In one embodiment, the first perception waveform is FMCW. The generation and transmission of the second candidate signal can refer to Figures 1 - 5 And the related descriptions in Examples 1 to 5.

[0379] In step S601, the second node N2 receives the second candidate signal. Based on the waveform characteristics of the second candidate signal and the time-frequency resources where it is located, the second node N2 successfully decodes the second candidate signal and can determine that the second candidate signal is sent by the first node U1. Then in step S602, a feedback message is sent in the first time window, and the feedback message is the message that the first node U1 expects to receive.

[0380] In a possible example, the message expected to be received is a random access response, such as RAR.

[0381] Accordingly, in step S663, the first node U1 receives the feedback message in the first time window, and no conflict will occur during the random access process. In a possible example, the feedback message is referred to as RAR. The signaling interaction between step S602 and step S663 can refer to the interaction of transmitting and receiving RAR messages in CFRA in the prior art. The setting and application principle of the first time window can refer to Figures 1 to 5 the relevant descriptions of the various embodiments in

[0382] Example 7

[0383] As a typical implementation manner, the first signal is the first candidate signal; the second signal is the second candidate signal. In one embodiment, the first candidate signal is a preamble, and the second candidate signal is a non-preamble signal. This non-Preamble signal can be a sensing signal. Specifically, it can be a Chirp signal; further, the resources occupied by this sensing signal can also be defined as a PRACH resource set.

[0384] Figure 7 shows a typical signaling interaction diagram according to another embodiment of the present application. Refer to Figure 7 , the second node N2 sends an RRC message in step S700. After that, the first node U1 receives the RRC message in step S771. The configuration and transmission of the RRC message can be executed with reference to the RRC message described in Figures 1 - 5 and Embodiment 5. Then, the first node U1 sends a first candidate signal in step S772. The first candidate signal is used as the first signal to initiate a random access process. In one example, the first candidate signal is a random access sequence, such as a preamble.

[0385] In step S773, as a response to the expiration of the first time window, increase the value of the random access transmission counter. The specific operation of this step can be referred to Figure 5Related description of step S553 in Example 5. If the random access sending counter does not reach the first preset threshold, the first node U1 may execute step S774, that is, send a second candidate signal; the second node N2 receives the second candidate signal in step S701. In one example, the second candidate signal is a first perception waveform, and the first perception waveform is a frequency modulated wave; or the first perception waveform is a single-frequency continuous wave. In one embodiment, the first perception waveform is FMCW. Then, a feedback message is sent in step S702, and the first node U1 receives the feedback message in step S775. The implementation details of the relevant steps can be referred to. Figure 6 Steps S662 to S663 in Example 6 complete the random access process.

[0386] Example 8

[0387] Figure 8 Another basic flow chart of the first node U1 and the second node N2 in one embodiment of the present application is shown. The first node U1 can be various terminal devices such as UE, and the second node N2 can be various network-side devices including but not limited to base stations, especially NR base stations. Figure 8 For example, the second node N2 may be a base station maintaining the service cell of the first node U1, and in particular may be a NR base station.

[0388] refer to Figure 8 In step S802, the second node N2 receives a first signal in a first random access process, where the type of the first random access process is four-step random access; the first signal is any one of a first candidate signal and a second candidate signal; wherein the sender of the first signal increases a random access sending counter in response to the expiration of a first time window; the start of the first time window depends on the sender of the first signal sending the first signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; of the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0389] Reference Figure 8 Before executing step S802, an optional step S801 can also be executed, that is, sending an RRC message, wherein the RRC message configures the second time-frequency resource set; wherein the RRC message includes a first domain, wherein the first domain indicates that the second time-frequency resource set is used for random access.

[0390] Specifically, before the first node U1 performs a random access procedure, the second node N2 may send an RRC message to it, informing the configuration information of the second time-frequency resource set, so that the first node U1 can know the time-frequency resources included in the second time-frequency resource set and the time-frequency resources available for random access. The second candidate signal transmitted by occupying the time-frequency resources in the second time-frequency resource set can be used for random access, and the first candidate signal occupying the first time-frequency resource set only for PRACH can also initiate random access. It can be seen that this solution increases the opportunity to initiate random access and is beneficial to improving the random access performance.

[0391] Furthermore, adding the second candidate signal will also cause the count value of statistically random access failures in the traditional solution to be incorrect. Therefore, in step S802, when the first time window expires, for example, when the expected feedback message (such as RAR) is not received in the first time window, this solution will update the random access transmission counter, thereby improving the statistical accuracy of the random access failure times.

[0392] Those skilled in the art understand that step S802 can be regarded as an execution step corresponding to steps S101 to S102 in the above Figure 1 illustrated embodiment. The two are complementary in terms of the specific implementation principle and logic. Regarding Figure 8 more content about the working principle and working mode of the first node U1 and the second node N2 in the illustrated application scenario, reference can be made to the relevant descriptions in the above Figures 1 - 7 and each embodiment, which will not be elaborated here.

[0393] Example 9

[0394] Embodiment 9 exemplifies a structural block diagram of a processing device for a first node according to an embodiment of the present application, as shown in the appendix Figure 9 shown. In the appendix Figure 9 shown, the processing device 900 in the first node includes a first transmitter 901 and a first processor 902.

[0395] In Embodiment 9, the first transmitter 901 is adapted to send a first signal during a first random access procedure, and the type of the first random access procedure is a four-step random access; the first processor 902 increases a random access transmission counter in response to the expiration of a first time window; wherein, the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

[0396] In one embodiment, the second candidate signal may adopt a first sensing waveform, and the first sensing waveform is a frequency modulation wave.

[0397] In one embodiment, whether the first signal is the first candidate signal or the second candidate signal may depend on whether the first random access procedure is a CFRA or a CBRA; at least when the first random access procedure is a CFRA, the first signal is the second candidate signal.

[0398] In one embodiment, whether the first signal is the first candidate signal or the second candidate signal may depend on the purpose of the first random access procedure; if the purpose of the first random access procedure belongs to a first candidate purpose set, the first signal is the first candidate signal; if the purpose of the first random access procedure belongs to a second candidate purpose set, the first signal is the second candidate signal; the first candidate purpose set and the second candidate purpose set are different.

[0399] In one embodiment, in the processing device 900, the first transmitter 901 is further adapted to send a second signal during the first random access procedure; the first processor 902 increases the random access transmission counter in response to the expiration of a second time window; wherein, the start time of the second time window depends on the transmission of the second signal; the first signal is the first candidate signal, and the second signal is the second candidate signal.

[0400] In one embodiment, the transmission power of the first signal may depend on a first counter; the transmission power of the second signal may depend on a second counter; the first counter and the second counter are different.

[0401] In one embodiment, the processing device 900 further includes a first receiver 903, which is adapted to receive an RRC message before transmitting the second candidate signal using the time-frequency resources in the second set of time-frequency resources, where the RRC message configures the second set of time-frequency resources; wherein, the RRC message includes a first field, and the first field indicates that the second set of time-frequency resources is used for random access.

[0402] As one embodiment, the first node is a user equipment.

[0403] As one embodiment, the first node is a relay node device.

[0404] As one embodiment, the first node is a serving cell maintenance device.

[0405] As one embodiment, the first node is a serving cell maintenance device of the second node.

[0406] As one embodiment, the first transmitter 901 includes at least one of {antenna 420, transmitter 418, transmission processor 416, multi-antenna transmission processor 471, controller / processor 475, memory 476} in Embodiment 4.

[0407] For more content about the working principle and working mode of the processing device 900, reference can be made to the relevant descriptions in the above Embodiments 1 to 13, which will not be elaborated here.

[0408] Example 10

[0409] Embodiment 10 exemplifies a structural block diagram of a processing device in a second node according to an embodiment of the present application, as shown in the appendix Figure 10 In the appendix Figure 10 shown. In the appendix

[0410] In Embodiment 10, the first receiver 1001 is adapted to receive a first signal in a first random access procedure, and the type of the first random access procedure is a four-step random access; the first signal is any one of a first candidate signal and a second candidate signal; wherein, in response to not receiving an expected feedback message within a first time window, the sender of the first signal increments a random access transmission counter; the start of the first time window depends on the sender of the first signal's transmission of the first signal; the first candidate signal only occupies the time-frequency resources in a first set of time-frequency resources, and the second candidate signal only occupies the time-frequency resources in a second set of time-frequency resources; among the first set of time-frequency resources and the second set of time-frequency resources, only the first set of time-frequency resources is configured for the physical random access channel.

[0411] In embodiment 10, the second candidate signal may adopt a first perceptual waveform. In one embodiment, the first perceptual waveform may be a frequency modulated wave.

[0412] In embodiment 10, whether the first signal is the first candidate signal or the second candidate signal depends on whether the first random access procedure is CFRA or CBRA; at least when the first random access procedure is CFRA, the first signal is the second candidate signal.

[0413] In embodiment 10, whether the first signal is the first candidate signal or the second candidate signal depends on the purpose of the first random access process; if the purpose of the first random access process belongs to the first candidate purpose set, the first signal is the first candidate signal; if the purpose of the first random access process belongs to the second candidate purpose set, the first signal is the second candidate signal; the first candidate purpose set and the second candidate purpose set are different.

[0414] In embodiment 10, the processing device 1000 may further include:

[0415] The first receiver 1001 may also be adapted to receive a second signal during the first random access process; the sender of the second signal, in response to expiration of a second time window, increments the random access transmission counter; wherein the start time of the second time window depends on the transmission of the second signal; the first signal is the first candidate signal, and the second signal is the second candidate signal. In one embodiment, when the first signal is the first candidate signal, if the random access transmission counter does not exceed a first preset threshold, the first receiver 1001 may also receive a second signal during the first random access process; the second signal is the second candidate signal; the sender of the first signal, in response to not receiving an expected feedback message within the second time window, increments the random access transmission counter; wherein the start time of the second time window depends on the transmission of the second signal.

[0416] In embodiment 10, the transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; and the first counter and the second counter are different.

[0417] In embodiment 10, the processing device 1000 may further include: a first transmitter 1002, adapted to send an RRC message, wherein the RRC message configures the second time-frequency resource set; wherein the RRC message includes a first field, wherein the first field indicates that the second time-frequency resource set is used for random access.

[0418] As an example, the second node is a base station device.

[0419] As an example, the second node is a satellite communication device.

[0420] As an example, the first receiver 1001 includes at least one of {antenna 452, receiver 454, receiving processor 456, multi-antenna receiving processor 458, controller / processor 459, memory 460, data source 467} in Embodiment 4.

[0421] For more details about the working principle and mode of the processing device 1000, reference can be made to the relevant descriptions in the above Embodiments 1 to 13, which will not be elaborated here.

[0422] Furthermore, an embodiment of the present invention also discloses a storage medium, on which computer instructions are stored. When the computer instructions run, they execute the method technical solutions described in the above Figures 1 to 7 illustrated embodiments. Preferably, the storage medium may include computer-readable storage media such as non-volatile memory or non-transitory memory. The storage medium may include ROM, RAM, magnetic disk, or optical disk, etc.

[0423] Furthermore, an embodiment of the present invention also discloses a terminal, including a memory and a processor. Computer instructions capable of running on the processor are stored on the memory. When the processor runs the computer instructions, it executes the method technical solutions described in the above Figures 1 to 7 illustrated embodiments. Preferably, the terminal may be a 5G user terminal.

[0424] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that contains one or more collections of available media. The available media can be magnetic media (such as floppy disks, hard disks, magnetic tapes), optical media (such as DVDs), or semiconductor media. The semiconductor media can be a solid-state drive.

[0425] It should be understood that in various embodiments of the present application, the sequence numbers of the above processes do not indicate the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0426] In several embodiments provided in the present application, it should be understood that the disclosed methods, devices, and systems can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0427] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0428] In addition, the functional units in various embodiments of the present invention may be integrated into a single processing unit, each unit may be physically included separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional units.

[0429] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, and other media that can store program code.

[0430] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software functional module. This application is not limited to any specific form of combination of software and hardware. The user equipment, terminal and UE in this application include but are not limited to drones, communication modules on drones, remote-controlled aircraft, aircraft, small aircraft, mobile phones, tablet computers, notebooks, vehicle-mounted communication equipment, transportation vehicles, vehicles, RSUs, wireless sensors, internet cards, Internet of Things terminals, RFID (Radio Frequency Identification) terminals, NB-IoT (Narrow Band Internet of Things) terminals, MTC (Machine Type Communication) terminals, eMTC (enhanced MTC) terminals, data cards, internet cards, vehicle-mounted communication equipment, low-cost mobile phones, low-cost tablet computers and other wireless communication devices. The base stations or system equipment in this application include but are not limited to macrocell base stations, microcell base stations, small cell base stations, home base stations, relay base stations, eNB (evolved Node B), gNB, TRP, GNSS (Global Navigation Satellite System), relay satellites, satellite base stations, aerial base stations, RSUs, drones, test equipment, such as transceivers or signaling testers that simulate some functions of base stations, and other wireless communication equipment.

[0431] Example 11

[0432] In Example 11, the first time window is ra-ResponseWindow. Figure 6 and Example 6, which will not be described in detail here.

[0433] Example 12

[0434] In Example 12, the first time window is ra-ResponseWindow. Figure 7 and Example 7, which will not be described in detail here.

[0435] Example 13

[0436] In Embodiment 13, the random access transmission counter is PREAMBLE_TRANSMISSION_COUNTER. For the rest, refer to Figure 6 , Figure 7 and Embodiments 6 - 7, which will not be elaborated here.

[0437] Example 14

[0438] In Embodiment 14, Figure 6 and Figure 7 the feedback message therein is named RAR. For the rest, refer to Embodiments 5 - 8, Embodiments 11 - 13.

[0439] Example 15

[0440] As an embodiment, one sensing opportunity in Embodiment 5 occupies discontinuous time - domain resources and continuous frequency - domain resources. For the rest, refer to Figure 5 , which will not be elaborated here.

[0441] As an embodiment, the second time - frequency resource is allocated to the reference signal RS; the second time - frequency resource set is allocated to SRS; or, the second time - frequency resource set is allocated to PUSCH.

[0442] As an embodiment, the second time - frequency resource set is allocated to PUCCH.

[0443] As an embodiment, the second time - frequency resource set is allocated to the sidelink (SL) channel.

[0444] As an embodiment, the second time - frequency resource set is allocated to the sidelink signal.

[0445] As an embodiment, the second time - frequency resource set is allocated to the measurement gap.

[0446] As an embodiment, the second time - frequency resource set is allocated to the sensing channel.

[0447] As an embodiment, the sensing channel is the ISAC sensing channel.

[0448] As an embodiment, the sensing channel is used to transmit sensing signals.

[0449] As an embodiment, the sensing channel is dynamically configured.

[0450] As an embodiment, the sensing channel is semi - statically configured.

[0451] As an embodiment, the second time-frequency resource set is configured for Sensing signals.

[0452] As an embodiment, the Sensing signals are used for positioning.

[0453] As an embodiment, the Sensing signal is a PRS.

[0454] As an embodiment, the Sensing signal is a sensing reference signal.

[0455] As an embodiment, the Sensing signal adopts a sensing waveform.

[0456] As an embodiment, the Sensing signal adopts a frequency-modulated wave.

[0457] As an embodiment, the time-frequency resources occupied by the Sensing signal are pre-configured.

[0458] As an embodiment, the time-frequency resources occupied by the Sensing signal are dynamically activated.

[0459] Those skilled in the art should understand that the present invention can be implemented in other specific forms without departing from its core or basic features. Therefore, the presently disclosed embodiments should be considered illustrative rather than restrictive in any case. The scope of the invention is determined by the appended claims rather than the foregoing description, and all changes within the equivalent meaning and scope thereof are considered to be included therein.

Claims

1. A first node for wireless communication, characterized in that, Comprising: A first transmitter that transmits a first signal during a first random access procedure, wherein the type of the first random access procedure is a four-step random access; A first processor that increments a random access transmission counter in response to the expiration of a first time window; Wherein, the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; Among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

2. The first node according to claim 1, wherein The second candidate signal uses a first sensing waveform, and the first sensing waveform is a frequency-modulated wave.

3. The first node according to claim 1 or 2, characterized in that, Whether the first signal is the first candidate signal or the second candidate signal depends on whether the first random access procedure is CFRA or CBRA; at least when the first random access procedure is CFRA, the first signal is the second candidate signal.

4. The first node according to any one of claims 1 to 3, characterized in that Whether the first signal is the first candidate signal or the second candidate signal depends on the purpose of the first random access procedure; if the purpose of the first random access procedure belongs to a first candidate purpose set, the first signal is the first candidate signal; If the purpose of the first random access procedure belongs to a second candidate purpose set, the first signal is the second candidate signal; the first candidate purpose set and the second candidate purpose set are different.

5. The first node according to any one of claims 1 to 4, characterized in that, Comprising: The first transmitter that transmits a second signal during the first random access procedure; The first processor that increments the random access transmission counter in response to the expiration of a second time window; Wherein, the start time of the second time window depends on the transmission of the second signal; the first signal is the first candidate signal, and the second signal is the second candidate signal.

6. The first node according to any one of claims 1 to 5, characterized in that The transmission power of the first signal depends on a first counter; the transmission power of the second signal depends on a second counter; the first counter and the second counter are different.

7. The first node according to any one of claims 1 to 6, characterized in that Comprising: A first receiver that receives an RRC message that configures the second time-frequency resource set; Wherein, the RRC message includes a first field that indicates that the second time-frequency resource set is used for random access.

8. A second node for wireless communication, characterized in that, Comprising: A first receiver that receives a first signal during a first random access procedure, wherein the type of the first random access procedure is a four-step random access; The first signal is either a first candidate signal or a second candidate signal; Wherein, the sender of the first signal increments a random access transmission counter in response to the expiration of a first time window; the start of the first time window depends on the sender of the first signal's transmission of the first signal; The first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; Among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for the physical random access channel.

9. A method in a first node for wireless communication, characterized in that, Comprising: Send a first signal in a first random access procedure, where the type of the first random access procedure is a four-step random access; Increment a random access transmission counter as a response to the expiration of a first time window; Wherein, the start of the first time window depends on the transmission of the first signal; the first signal is either a first candidate signal or a second candidate signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; Among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

10. A method in a second node for wireless communication, characterized in that, Includes: Receive a first signal in a first random access procedure, where the type of the first random access procedure is a four-step random access; the first signal is either a first candidate signal or a second candidate signal; Wherein, the sender of the first signal increments a random access transmission counter in response to the expiration of a first time window; the start of the first time window depends on the sender of the first signal's transmission of the first signal; the first candidate signal occupies time-frequency resources in a first time-frequency resource set, and the second candidate signal occupies time-frequency resources in a second time-frequency resource set; Among the first time-frequency resource set and the second time-frequency resource set, only the first time-frequency resource set is configured for a physical random access channel.

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