Method and device used for wireless communication

Abstract

The invention discloses a method and a device used for wireless communication. The first node sends a first random access preamble in the first PRACH opportunity; starting a random access response window; when the random access response window runs, monitoring a PDCCH (Physical Downlink Control Channel), wherein downlink distribution indicated by the PDCCH is used for scheduling a random access response; maintaining the first counter; wherein the step of maintaining the first counter comprises: when the random access response window is expired and the random access response is not successfully received, determining whether to add 1 to the value of the first counter; the determining whether to add 1 to the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the time domain by the first PRACH opportunity. According to the invention, the performance of the random access process in the SBFD system can be effectively supported.

Description

Technical Field

[0001] This application relates to methods and apparatuses in a wireless communication system, and particularly to methods and apparatuses for supporting a Random Access (RA) process in wireless communication. Background Art

[0002] The application scenarios of future wireless communication systems are becoming more and more diversified, and different application scenarios pose different performance requirements on the system. In order to meet the different performance requirements of various application scenarios, it was decided at the 72nd plenary session of 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) to conduct research on the New Radio (NR) (or 5G) new air interface technology. At the 75th plenary session of 3GPP RAN, the WI (Work Item) of the New Radio (NR) new air interface technology was adopted, and the standardization work of NR was started.

[0003] Random access is a common method in cellular communication. Uplink synchronization and uplink transmission resources can be obtained through a 4-step random access process or a 2-step random access process.

[0004] Full Duplex (FD) can significantly improve spectral efficiency and thus become a research hotspot. Among them, SubBand non-overlapping Full Duplex (SBFD) has particularly attracted the research interest of the industry. Summary of the Invention

[0005] For random access in the SBFD scenario, existing random access operations may no longer be applicable. This application discloses a solution. Without conflict, the embodiments and features in the embodiments of this application can be combined with each other arbitrarily. Further, although the original intention of this application is for the Uu air interface, this application can also be used for the PC5 interface. Further, although the original intention of this application is for the SBFD scenario, this application is also applicable to other non-SBFD scenarios facing similar problems and achieves similar technical effects. In addition, adopting a unified solution for different scenarios helps to reduce hardware complexity or improve compatibility. Without conflict, the embodiments and features in the embodiments of any node in this application can be applied to any other node. In particular, the explanations of the terms, nouns, functions, and variables in this application (if not otherwise specified) can refer to the definitions in the 3GPP specification protocols TS38 series and TS37 series.

[0006] A method applied to a first node for wireless communication is disclosed, characterized by including:

[0007] Transmit a first random access preamble in a first PRACH opportunity;

[0008] Start a random access response window;

[0009] Monitor the PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule the random access response;

[0010] Maintain a first counter;

[0011] Wherein, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter; the determination of whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain.

[0012] As an embodiment, the first PRACH (Physical Random Access Channel) opportunity corresponds to a time-frequency resource block.

[0013] As an embodiment, the first PRACH opportunity includes multiple symbols in the time domain, and one of the multiple symbols is an SBFD symbol or a non-SBFD (non-SBFD) symbol.

[0014] As an embodiment, the number of non-SBFD symbols in the multiple symbols included in the first PRACH opportunity in the time domain is 0, that is, all the multiple symbols included in the first PRACH opportunity in the time domain are SBFD symbols.

[0015] As an embodiment, the number of non-SBFD symbols in the multiple symbols included in the first PRACH opportunity in the time domain is greater than 0, that is, at least one non-SBFD symbol is included in the multiple symbols included in the first PRACH opportunity in the time domain.

[0016] As a sub-embodiment of the above embodiment, all the multiple symbols included in the first PRACH opportunity in the time domain are non-SBFD symbols.

[0017] As a sub-embodiment of the above embodiment, some of the multiple symbols included in the first PRACH opportunity in the time domain are non-SBFD symbols and the remaining are SBFD symbols.

[0018] As an example, the above method can effectively support the scenario where traditional PRACH opportunities that only include uplink symbols and PRACH opportunities that include SBFD symbols are applied to the same random access procedure.

[0019] As an example, the above method adopts a mixed PRACH opportunity in the same random access procedure, which can simplify the implementation of the UE or terminal.

[0020] As an example, the channel characteristics on the non-SBFD symbols are different from those on the SBFD symbols. Generally, the interference received on the SBFD symbols is much greater than that on the non-SBFD symbols. The above method determines whether to increment the value of the first counter according to the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain, which can effectively improve the performance of the random access procedure, including: on the one hand, it can avoid frequent random access problems due to strong interference on the SBFD symbols, and it can also avoid large delays caused by repeatedly performing the random access procedure in a cell with poor channel quality.

[0021] According to one aspect of the present application, the features of the above method include:

[0022] The first PRACH opportunity includes Q symbols in the time domain, and all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol;

[0023] Wherein, the Q is a positive integer greater than 1.

[0024] According to one aspect of the present application, the features of the above method include:

[0025] When all of the Q symbols are the non-SBFD symbols, it is determined to increment the value of the first counter.

[0026] As an example, since the interference received on the non-SBFD symbols is generally much less than that on the SBFD symbols, the above method can effectively utilize the reception on the Q non-SBFD symbols and avoid large delays caused by repeatedly performing the random access procedure in a cell with poor channel quality.

[0027] As an example, the non-SBFD symbol is an uplink symbol (UL symbol).

[0028] As an example, the above method is backward compatible, which can reduce the cost of the UE (User Equipment) or terminal.

[0029] According to one aspect of the present application, the features of the above method include:

[0030] When the number of the non - SBFD symbols included in the Q symbols is greater than the number of the SBFD symbols included in the Q symbols, it is determined to increment the value of the first counter by 1.

[0031] As an embodiment, since the interference received on the non - SBFD symbols is generally much smaller than the interference received on the SBFD symbols, the above method can effectively utilize the reception on the multiple non - SBFD symbols included in the Q symbols, and avoid causing a large delay due to repeatedly performing the random access process in a cell with poor channel quality.

[0032] According to one aspect of the present application, the features of the above method include:

[0033] When the number of the non - SBFD symbols included in the Q symbols is greater than a first threshold, it is determined to increment the value of the first counter by 1;

[0034] Wherein, the first threshold is configured or pre - configured.

[0035] As an embodiment, since the interference received on the non - SBFD symbols is generally much smaller than the interference received on the SBFD symbols, the above method can effectively utilize the reception on the multiple non - SBFD symbols included in the Q symbols, and avoid causing a large delay due to repeatedly performing the random access process in a cell with poor channel quality.

[0036] According to one aspect of the present application, the features of the above method include:

[0037] The SBFD symbol is a symbol including a first sub - band used for SBFD operation.

[0038] As an embodiment, the transmission direction on the first sub - band included in the SBFD symbol is different from the transmission direction on the sub - bands other than the first sub - band included in the SBFD symbol.

[0039] As an embodiment, the transmission direction on the first sub - band is uplink.

[0040] As a sub - embodiment of the above embodiment, the transmission direction on the sub - bands other than the first sub - band included in the SBFD symbol is downlink.

[0041] As a sub - embodiment of the above embodiment, the first sub - band is in the ULBWP (BandWidth Part).

[0042] According to one aspect of the present application, the features of the above method include:

[0043] Receive a first RRC message, where the first RRC message indicates the frequency-domain position of the first sub-band and the time-domain position of the SBFD symbol;

[0044] Wherein, the first sub-band is located in the UL BWP in the frequency domain.

[0045] According to one aspect of the present application, the features of the above method include:

[0046] Receive a second RRC message, where the second RRC message configures a set of target PRACH opportunities, and the set of target PRACH opportunities includes multiple PRACH opportunities;

[0047] Wherein, the first PRACH opportunity is one of the set of target PRACH opportunities; some of the multiple PRACH opportunities include only non-SBFD symbols among the Q symbols in the time domain, and the remaining part of the multiple PRACH opportunities includes at least one SBFD symbol among the Q symbols in the time domain.

[0048] As an embodiment, the candidates for the first PRACH opportunity include the PRACH opportunities in the set of target PRACH opportunities.

[0049] According to one aspect of the present application, the features of the above method include:

[0050] The first random access preamble belongs to a target random access preamble group, and the target random access preamble group is only available for SBFD-aware nodes, and the first node is the SBFD-aware node.

[0051] As an embodiment, the target random access preamble group can enable the base station to know in advance whether a node is aware of SBFD, so as to determine whether the subsequent transmission can be scheduled in the SBFD symbol, adjust the transmission resources of the SBFD-aware UE, and also reduce the random access process delay.

[0052] According to one aspect of the present application, the features of the above method include:

[0053] When the value of the first counter reaches a second threshold, indicate a random access problem to the upper layer;

[0054] Wherein, the first random access preamble is sent on the SpCell; the second threshold is configured.

[0055] As an embodiment, the first node is in the RRC connected state (RRC_Connected).

[0056] This application discloses a terminal, characterized in that

[0057] the terminal includes: one or more processors and a memory;

[0058] the memory is coupled to the one or more processors, and the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the terminal to execute the above method in the first node. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0060] Figure 1 Illustrates a signal processing flow chart in the first node according to an embodiment of this application;

[0061] Figure 2 Illustrates a schematic diagram of a network architecture according to an embodiment of this application;

[0062] Figure 3 Illustrates a schematic diagram of a radio protocol architecture of a user plane and a control plane according to an embodiment of this application;

[0063] Figure 4 Illustrates a schematic diagram of a hardware module of a communication device according to an embodiment of this application;

[0064] Figure 5 Illustrates a radio signal transmission flow chart according to an embodiment of this application;

[0065] Figure 6 Illustrates a schematic diagram of the relationship between an SBFD symbol and a first sub-band according to an embodiment of this application;

[0066] Figure 7 Illustrates a schematic diagram of a target PRACH opportunity set and symbols included in a first PRACH in the time domain according to an embodiment of this application;

[0067] Figure 8 Illustrates a signal processing flow chart in the first node according to an embodiment of this application;

[0068] Figure 9 Illustrates a signal processing flow chart in the first node according to an embodiment of this application;

[0069] Figure 10 Illustrates a signal processing flow chart in the first node according to an embodiment of this application;

[0070] Figure 11 Illustrates a signal processing flowchart in a first node according to an embodiment of the present application;

[0071] Figure 12 Illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application. Detailed implementation manners

[0072] The technical solutions 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 of the present application and the features in the embodiments can be arbitrarily combined with each other.

[0073] Example 1

[0074] Embodiment 1 illustrates a signal processing flowchart in a first node according to an embodiment of the present application, as shown in the accompanying Figure 1 drawing.

[0075] In Embodiment 1, the first node 100 sends a first random access preamble in a first PRACH opportunity in step 101; starts a random access response window in step 102; monitors the PDCCH when the random access response window is running in step 103; maintains a first counter in step 103; wherein, the downlink allocation indicated by the PDCCH is used to schedule the random access response; the maintaining of the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter by 1; the determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain.

[0076] As an embodiment, a first random access preamble is sent in a first PRACH opportunity (PRACH occasion).

[0077] As an embodiment, the first random access preamble is sent through the PRACH.

[0078] As an embodiment, the SS (Synchronization Signals)-RSRP (Reference Signal Received Power) of the SSB (Synchronization Signal block, synchronization signal block) corresponding to the first PRACH opportunity is higher than a configured threshold.

[0079] As an embodiment, the SSB corresponding to the first PRACH opportunity is optional.

[0080] As an example, the first PRACH opportunity corresponds to a PRACH resource.

[0081] As an example, the first PRACH opportunity includes time-domain resources and frequency-domain resources.

[0082] As an example, the first PRACH opportunity includes at least one symbol in the time domain.

[0083] As an example, a symbol is a multicarrier symbol.

[0084] As an example, a symbol is an OFDM (Orthogonal Frequency Division Multiplexing) symbol.

[0085] As an example, a symbol is a single carrier symbol.

[0086] As an example, a symbol is a DFT (Discrete Fourier Transform)-S (Spread)-OFDM symbol.

[0087] As an example, a symbol is an SC (single carrier)-FDMA (frequency-division multiple access) symbol.

[0088] As an example, the first PRACH opportunity includes at least one subcarrier in the frequency domain.

[0089] As an example, unless otherwise specified, a PRACH opportunity, a PRACH transmission occasion, and a RACH (Random Access Channel) opportunity in this application can be used interchangeably.

[0090] As an example, the first PRACH opportunity and the first random access preamble are contention-based.

[0091] As an example, the first PRACH opportunity and the first random access preamble are contention-free.

[0092] As an example, the first random access preamble is indicated by a first preamble index.

[0093] As an example, the first random access preamble is a characteristic sequence.

[0094] As an example, the first random access preamble is a Gold sequence.

[0095] As an example, the first random access preamble is an M sequence.

[0096] As an example, the first random access preamble is a ZC (Zadoff–Chu) sequence.

[0097] As an example, transmitting the first random access preamble in the first PRACH opportunity belongs to a first random access procedure.

[0098] As an example, the first random access procedure is triggered by the network.

[0099] As an example, the first random access procedure is triggered by an event.

[0100] As a sub - example of the above example, the event includes an initial access from RRC (Radio Resource Control)_IDLE.

[0101] As a sub - example of the above example, the event includes an RRC connection re - establishment procedure.

[0102] As a sub - example of the above example, the event includes an SR (Scheduling Request) failure.

[0103] As a sub - example of the above example, the event includes a beam failure recovery.

[0104] As an example, a random access response window starts after the first random access preamble is transmitted.

[0105] As an example, the random access response window is ra - ResponseWindow, and the first random access procedure is a 4 - step random access procedure.

[0106] As an example, the random access response window is msgB-ResponseWindow (Message B response window), and the first random access procedure is a two-step random access procedure.

[0107] As an example, the random access response window is a timer.

[0108] As an example, starting the random access response window includes: the random access response window starts running.

[0109] As an example, when the random access response window is running, it updates the random access response window at each time interval; when the random access response window expires, it stops updating the random access response window at each time interval.

[0110] As an example, when starting the random access response window, the value of the random access response window is set to 0. The phrase "updating the random access response window" includes: adding 1 to the value of the random access response window; when the value of the random access response window is the expiration value of the random access response window, the random access response window expires.

[0111] As an example, when starting the random access response window, the value of the random access response window is set to the expiration value of the random access response window. The phrase "updating the random access response window" includes: subtracting 1 from the value of the random access response window; when the value of the random access response window is 0, the random access response window expires.

[0112] As an example, one time interval includes a duration.

[0113] As an example, one time interval includes 1 ms.

[0114] As an example, the random access response window is maintained at the MAC (Medium Access Control) sublayer of the first node.

[0115] As an example, when the random access response window is running, it monitors the PDCCH (Physical Downlink Control Channel).

[0116] As an example, it monitors the PDCCH on the SpCell.

[0117] As an example, the meaning of the "monitoring" includes "search".

[0118] As an embodiment, the meaning of the monitoring includes listening (monitor).

[0119] As an embodiment, the phrase "monitoring PDCCH" includes: determining whether there is a PDCCH through coherent detection.

[0120] As an embodiment, the phrase "monitoring PDCCH" includes: determining whether there is a PDCCH through maximum likelihood detection.

[0121] As an embodiment, the phrase "monitoring PDCCH" includes: determining whether there is a PDCCH through blind decoding detection.

[0122] As an embodiment, the phrase "monitoring PDCCH" includes: monitoring PDCCH in the CSS (Common Search Space).

[0123] As an embodiment, the PDCCH is identified by a first RNTI (Radio Network Temporary Identifier).

[0124] As a sub - embodiment of the above - mentioned embodiment, the PDCCH carries DCI (Downlink Control Information), and the CRC (Cyclic Redundancy Check) of the DCI is scrambled by the first RNTI.

[0125] As an embodiment, the first RNTI is a RA (Random Access) - RNTI.

[0126] As a sub - embodiment of the above - mentioned embodiment, the random access response window is ra - ResponseWindow.

[0127] As an embodiment, the first RNTI is a MSGB (Message B) - RNTI.

[0128] As an embodiment, the first RNTI is a C (Cell) - RNTI.

[0129] As a sub - embodiment of the above two embodiments, the random access response window is msgB - ResponseWindow.

[0130] As an embodiment, the downlink assignment indicated by the PDCCH is used to schedule the random access response.

[0131] As a sub - embodiment of the above - mentioned embodiment, the PDCCH indicates a downlink allocation, and the downlink allocation is used to schedule the transmission of a MAC PDU (Protocol Data Unit), and the MAC PDU is a random access response.

[0132] As an embodiment, the random access response is a RAR (RandomAccess Response); wherein, the random access response window is ra - ResponseWindow.

[0133] As an embodiment, the random access response is a MSGB (Message B); wherein, the random access response window is msgB - ResponseWindow.

[0134] As an embodiment, a first counter is maintained.

[0135] As an embodiment, the first counter is maintained at the MAC sublayer of the first node.

[0136] As an embodiment, the first counter is used to count the number of failures of the first random access procedure.

[0137] As an embodiment, the first counter is a PREAMBLE_TRANSMISSION_COUNTER (preamble transmission counter).

[0138] As an embodiment, maintaining the first counter includes: when the first random access procedure is triggered, setting the value of the first counter to 1.

[0139] As an embodiment, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter.

[0140] As an embodiment, the random access response not being successfully received means: not receiving a random access response including a random access preamble identifier that matches the first random access preamble.

[0141] As an embodiment, the random access response not being successfully received includes: not receiving the random access response.

[0142] As an example, the unsuccessful reception of the random access response includes: receiving the random access response, but the random access response does not include a random access preamble identifier that matches the first random access preamble.

[0143] As an example, the unsuccessful reception of the random access response includes: receiving the random access response, but the random access preamble identifier included in the random access response does not match the first preamble index.

[0144] As an example, the unsuccessful reception of the random access response includes: not receiving the PDCCH.

[0145] As a sub - example of the above example, the PDCCH is addressed to the RA - RNTI, or the MSGB - RNTI.

[0146] As an example, the unsuccessful reception of the random access response includes: receiving the PDCCH, but the PDCCH does not include an uplink grant for a new transmission.

[0147] As an example, the unsuccessful reception of the random access response includes: receiving the PDCCH, the PDCCH includes a downlink assignment, and the MAC PDU scheduled by the downlink assignment does not include an absolute TAC (Timing Advance Command) MAC CE (Control Element).

[0148] As a sub - example of the above two examples, the PDCCH is addressed to the C - RNTI, and the C - RNTI is included in the MSGA (Message A).

[0149] As an example, the unsuccessful reception of the random access response includes: receiving the random access response, but the UE Contention Resolution Identity included in the random access response does not match the CCCH (Common Control Channel) SDU (Service Data Unit) included in the MSGA.

[0150] As a sub - example of the above example, the PDCCH is addressed to the MSGB - RNTI.

[0151] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain.

[0152] As an embodiment, determine whether to increment the value of the first counter according to the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain.

[0153] As an embodiment, the transmission directions on the SBFD symbols include uplink and downlink.

[0154] As an embodiment, the transmission direction on the non-SBFD symbols is unique, that is, uplink, or downlink.

[0155] As an embodiment, the non-SBFD symbols are uplink symbols.

[0156] As an embodiment, the uplink symbols are only used for uplink.

[0157] As an embodiment, when it is determined to increment the value of the first counter, increment the value of the first counter.

[0158] As an embodiment, when it is determined not to increment the value of the first counter, keep the value of the first counter unchanged.

[0159] As an embodiment, when the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain is 0, determine not to increment the value of the first counter.

[0160] As an embodiment, when all the symbols included in the first PRACH opportunity in the time domain are the SBFD symbols, determine not to increment the value of the first counter.

[0161] As a sub-embodiment of the above two embodiments, since the interference received on the SBFD symbols is generally much greater than the interference received on the non-SBFD symbols, the above method can avoid the random access process problems caused by strong interference on the SBFD symbols.

[0162] As an embodiment, when the first PRACH opportunity includes some non-SBFD symbols in the time domain, determine not to increment the value of the first counter.

[0163] As a sub-embodiment of the above embodiment, since the interference received on the SBFD symbols is generally much greater than the interference received on the non-SBFD symbols, the above method can avoid the random access process problems caused by strong interference on the remaining part of the SBFD symbols.

[0164] As an embodiment, when the first PRACH opportunity includes some of the non-SBFD symbols in the time domain, it is determined to increment the value of the first counter by 1.

[0165] As a sub-embodiment of the above embodiment, the interference received on the non-SBFD symbols is generally much less than that received on the SBFD symbols. The above method can effectively utilize the reception on some of the non-SBFD symbols and avoid large delays caused by repeatedly performing the random access procedure in cells with poor channel quality.

[0166] As an embodiment, when all the symbols included by the first PRACH opportunity in the time domain are the non-SBFD symbols, the first PRACH opportunity is a first type of PRACH opportunity.

[0167] As an embodiment, when the symbols included by the first PRACH opportunity in the time domain do not include the non-SBFD symbols, that is, all are the SBFD symbols, the first PRACH opportunity is a second type of PRACH opportunity.

[0168] As an embodiment, when the symbols included by the first PRACH opportunity in the time domain include some of the non-SBFD symbols and some of the SBFD symbols, the first PRACH opportunity is a third type of PRACH opportunity.

[0169] As an embodiment, the determination of whether to increment the value of the first counter depends on the number of non-SBFD symbols among the symbols included by the first PRACH opportunity in the time domain: the determination of whether to increment the value of the first counter depends on the type of the first PRACH opportunity.

[0170] As an embodiment, when the first PRACH opportunity is the second type of PRACH, it is determined not to increment the value of the first counter by 1.

[0171] As an embodiment, when the first PRACH opportunity is the third type of PRACH, it is determined not to increment the value of the first counter by 1.

[0172] As a sub-embodiment of the above two embodiments, since the interference received on the SBFD symbols is generally much greater than that received on the non-SBFD symbols, the above method can avoid problems in the random access procedure caused by strong interference on at least some of the SBFD symbols.

[0173] As an embodiment, when the first PRACH opportunity is the first type of PRACH, it is determined to increment the value of the first counter by 1.

[0174] As an example, when the first PRACH opportunity is the third type of PRACH, it is determined to increment the value of the first counter by 1.

[0175] As a sub - example of the above two examples, the interference received on the non - SBFD symbols is generally much less than that on the SBFD symbols. The above method can effectively utilize at least the reception on the non - SBFD symbols, avoiding large delays caused by repeatedly performing the random access procedure in cells with poor channel quality.

[0176] Example 2

[0177] Embodiment 2 exemplifies a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the appendix Figure 2 as follows. Figure 2A diagram showing the network architecture 200 of NR 5G, LTE (Long-Term Evolution), and LTE-A (Long-Term Evolution Advanced) systems. The NR 5G, LTE, or LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable term. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, NG-RAN (Next Generation Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet services 230. The 5GS / EPS may be interconnected 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 understand that the various concepts presented throughout this application can be extended to networks providing circuit-switched services or other cellular networks. The NG-RAN includes NR Node B (gNB) 203 and other gNBs 204. The gNB 203 provides user and control plane protocol termination towards the UE 201. The gNB 203 may be connected to other gNBs 204 via the Xn interface (e.g., backhaul). The gNB 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 (Transmission Reception Point), or some other suitable term. In an NTN (Non Terrestrial Network) network, the gNB 203 may be a satellite, an aircraft, or a terrestrial base station relayed by a satellite. The gNB 203 provides an access point for the UE 201 to the 5GC / EPC 210.Examples of the UE 201 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, automobiles, in-vehicle devices, in-vehicle communication units, wearable devices, or any other similar functional devices. 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 term. The gNB 203 is connected to the 5GC / EPC 210 through the S1 / NG interface. The 5GC / EPC 210 includes a Mobility Management Entity (MME) / Authentication Management Field (AMF) / Session Management Function (SMF) 211, other MME / AMF / SMFs 214, a Serving Gateway (S-GW) / User Plane Function (UPF) 212, and a Packet Data Network Gateway (P-GW) / UPF 213. The MME / AMF / SMF 211 is a control node that processes the signaling between the UE 201 and the 5GC / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through the S-GW / UPF 212, which is itself connected to the P-GW / UPF 213. The P-GW provides UE IP address allocation and other functions. The P-GW / UPF 213 is connected to the Internet service 230. The Internet service 230 includes the operator's corresponding Internet protocol services, which may specifically include the Internet, intranet, IP Multimedia Subsystem (IMS), and Packet Switching (PS) streaming services.

[0178] As an embodiment, the UE 201 corresponds to the first node in this application.

[0179] As an embodiment, the NR Node B 203 corresponds to the second node in the present application.

[0180] As an embodiment, the UE 201 supports SBFD.

[0181] As an embodiment, the gNB 203 supports SBFD.

[0182] As an embodiment, the gNB 203 is a macro cell base station.

[0183] As an embodiment, the gNB 203 is a micro cell base station.

[0184] As an embodiment, the gNB 203 is a pico cell base station.

[0185] As an embodiment, the gNB 203 is a femtocell.

[0186] As an embodiment, the gNB 203 is a base station device that supports large delay differences.

[0187] As an embodiment, the gNB 203 is a flying platform device.

[0188] As an embodiment, the gNB 203 is a satellite device.

[0189] As an embodiment, the gNB 203 is a test device (such as a transceiver that simulates some functions of a base station, a signaling tester).

[0190] As an embodiment, the radio link from the UE 201 to the gNB 203 is an uplink, and the uplink is used to perform uplink transmission.

[0191] As an embodiment, the radio link from the gNB 203 to the UE 201 is a downlink, and the downlink is used to perform downlink transmission.

[0192] As an embodiment, the UE 201 and the gNB 203 are respectively connected through the Uu interface.

[0193] Example 3

[0194] Embodiment 3 exemplifies a schematic diagram of the radio protocol architecture of the user plane and the control plane according to an embodiment of the present application, as shown in the appendix Figure 3 as follows. Figure 3 It is a schematic diagram illustrating an embodiment of the radio protocol architecture for the user plane 350 and the control plane 300.Figure 3The radio protocol architecture of the control plane 300 of the UE and the gNB is shown in 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. Layer 1 will be referred to as PHY 301 in this article. Layer 2 (L2 layer) 305 is above PHY 301 and is responsible for the link between the UE and the gNB through PHY 301. Layer 2 305 includes a MAC (Medium Access Control) sub-layer 302, an RLC (Radio Link Control) sub-layer 303, and a PDCP (Packet Data Convergence Protocol) sub-layer 304, and these sub-layers terminate at the gNB on the network side. The PDCP sub-layer 304 provides data encryption and integrity protection. The PDCP sub-layer 304 also provides handover support for the UE between gNBs. The RLC sub-layer 303 provides segmentation and reassembly of data packets, retransmission of lost data packets through ARQ, and also provides duplicate data packet detection and protocol error detection. The MAC sub-layer 302 provides the mapping between logical and transport channels and the multiplexing of logical channel identities. The MAC sub-layer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell among UEs. The MAC sub-layer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC (Radio Resource Control) sub-layer 306 in Layer 3 (L3 layer) of the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the gNB and the UE. The radio protocol architecture of the user plane 350 includes Layer 1 (L1 layer) and Layer 2 (L2 layer). The radio protocol architecture in the user plane 350 is generally the same as the corresponding layers and sub-layers in the control plane 300 for the physical layer 351, the PDCP sub-layer 354 in the L2 layer 355, the RLC sub-layer 353 in the L2 layer 355, and the MAC sub-layer 352 in the L2 layer 355. However, the PDCP sub-layer 354 also provides header compression for upper layer data packets to reduce wireless transmission overhead. The L2 layer 355 in the user plane 350 also includes an SDAP (Service Data Adaptation Protocol) sub-layer 356, and the SDAP sub-layer 356 is responsible for the mapping between QoS (Quality of Service) flows and data radio bearers (DRBs) to support service diversity.The radio protocol architecture of the UE in the user plane 350 may include some or all of the protocol sub-layers of the SDAP sub-layer 356, PDCP sub-layer 354, RLC sub-layer 353, and MAC sub-layer 352 at the L2 layer. Although not shown, the UE may also 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, server, etc.).

[0195] As an example, the Figure 3 radio protocol architecture in is applicable to the first node in this application.

[0196] As an example, the Figure 3 radio protocol architecture in is applicable to the second node in this application.

[0197] As an example, the first random access preamble in this application is generated by the PHY301 or the PHY351.

[0198] As an example, the PDCCH in this application is generated by the PHY301 or the PHY351.

[0199] As an example, the random access response in this application is generated by the MAC302 or the MAC352.

[0200] As an example, the first RRC message in this application is generated by the RRC306.

[0201] As an example, the second RRC message in this application is generated by the RRC306.

[0202] As an example, the random access problem in this application is generated by the MAC302 or the MAC352.

[0203] As an example, the random access response window in this application is maintained by the MAC302 or the MAC352.

[0204] As an example, the first counter in this application is maintained by the MAC302 or the MAC352.

[0205] As an example, the L2 layer 305 or 355 belongs to a higher layer.

[0206] As an example, the RRC sub-layer 306 in the L3 layer belongs to a higher layer.

[0207] Example 4

[0208] Example 4 illustrates a schematic diagram of the hardware modules of a communication device according to an embodiment of the present application, as shown in the appendix Figure 4 as follows. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 that communicate with each other in an access network.

[0209] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmitting processor 468, a receiving processor 456, a multi-antenna transmitting processor 457, a multi-antenna receiving processor 458, a transmitter / receiver 454, and an antenna 452.

[0210] The second communication device 410 includes a controller / processor 475, a memory 476, a data source 477, a receiving processor 470, a transmitting processor 416, a multi-antenna receiving processor 472, a multi-antenna transmitting processor 471, a transmitter / receiver 418, and an antenna 420.

[0211] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, upper layer data packets from the core network or from the data source 477 are provided to the controller / processor 475. The core network and the data source 477 represent all protocol layers above the L2 layer. The controller / processor 475 implements the functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements encoding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, and mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital space precoding on the encoded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time domain and / or frequency domain, and then uses the inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. Subsequently, the multi-antenna transmit processor 471 performs transmit analog precoding / beamforming operations on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream and then provides it to different antennas 420.

[0212] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives signals via its respective antenna 452. Each receiver 454 recovers the information modulated onto the radio frequency carrier and converts the radio frequency stream into a baseband multi-carrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 perform various signal processing functions of the L1 layer. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receivers 454. The receive processor 456 uses the fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receive analog precoding / beamforming operations from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive processor 456, where the reference signal will be used for channel estimation, and the data signal is recovered in the multi-antenna receive processor 458 for any spatial stream destined for the first communication device 450 after multi-antenna detection. The symbols on each spatial stream are demodulated and recovered in the receive processor 456, and soft decisions are generated. Subsequently, the receive processor 456 decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. Subsequently, the upper layer data and control signals are provided to a controller / processor 459. The controller / processor 459 performs the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program code and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover upper layer data packets from the second communication device 410. Subsequently, the upper layer data packets are provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0213] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, an upper layer data packet is provided to the controller / processor 459 using the data source 467. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission function described at the second communication device 410 in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements L2 layer functions for the user plane and the control plane. The controller / processor 459 is also responsible for retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping and channel coding processing. The multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Subsequently, the transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, and after the analog precoding / beamforming operation in the multi-antenna transmit processor 457, it is provided to different antennas 452 via the transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream and then provides it to the antenna 452.

[0214] In the transmission from the first communication device 450 to the second communication device 410, the function at the second communication device 410 is similar to the reception function described at the first communication device 450 in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna receive processor 472 and the receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 jointly implement the L1 layer functions. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 may be associated with a memory 476 that stores program code and data. The memory 476 may be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packet from the first communication device 450. The upper layer data packet from the controller / processor 475 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0215] As an example, the first communication 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 with the at least one processor, and the first communication device 450 is at least: sending a first random access preamble in a first PRACH opportunity; starting a random access response window; monitoring a PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule a random access response; maintaining a first counter; wherein, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter; determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain.

[0216] As an example, the first communication device 450 includes: a memory storing a computer-readable instruction program, and the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: sending a first random access preamble in a first PRACH opportunity; starting a random access response window; monitoring a PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule a random access response; maintaining a first counter; wherein, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter; determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain.

[0217] As an example, the second communication device 410 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 with the at least one processor. The second communication device 410 is at least: receiving a first random access preamble in a first PRACH opportunity; sending a PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule a random access response; sending a first RRC message; sending a second RRC message.

[0218] As an embodiment, the second communication device 410 includes: a memory storing a computer-readable instruction program, which generates actions when executed by at least one processor, and the actions include: receiving a first random access preamble in a first PRACH opportunity; sending a PDCCH when a random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule a random access response; sending a first RRC message; sending a second RRC message.

[0219] As an embodiment, the first communication device 450 corresponds to the first node in the present application.

[0220] As an embodiment, the second communication device 410 corresponds to the second node in the present application.

[0221] As an embodiment, the first communication device 450 is a UE.

[0222] As an embodiment, the first communication device 450 is a relay.

[0223] As an embodiment, the second communication device 410 is a base station device.

[0224] As an embodiment, the second communication device 410 is a distributed unit of a base station.

[0225] As an embodiment, the second communication device 410 is a piece of code in a distributed unit of a base station.

[0226] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmission processor 457, the transmission processor 468, or the controller / processor 459 is used to send the first random access preamble in the present application.

[0227] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470, or the controller / processor 475 is used to receive the first random access preamble in the present application.

[0228] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, or the controller / processor 475 is used to send the PDCCH in the present application.

[0229] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456, or the controller / processor 459 is used to monitor the PDCCH in the present application.

[0230] As an example, at least one of the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, or the controller / processor 475 is used to transmit the random access response in the present application.

[0231] As an example, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456, or the controller / processor 459 is used to receive the random access response in the present application.

[0232] As an example, at least one of the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, or the controller / processor 475 is used to transmit the first RRC message in the present application.

[0233] As an example, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456, or the controller / processor 459 is used to receive the first RRC message in the present application.

[0234] As an example, at least one of the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, or the controller / processor 475 is used to transmit the second RRC message in the present application.

[0235] As an example, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456, or the controller / processor 459 is used to receive the second RRC message in the present application.

[0236] Example 5

[0237] Embodiment 5 exemplifies a wireless signal transmission flowchart according to an embodiment of the present application, as shown in the appendix Figure 5 shown. In the appendix Figure 5 In it, the first node N51 and the second node N52 communicate through a wireless interface. It should be specifically noted that the order in this example does not limit the signal transmission order and the implementation order in the present application.

[0238] For First node N51, receive a first RRC message in step S511; receive a second RRC message in step S512; send a first random access preamble in a first PRACH opportunity in step S513; start a random access response window in step S514; monitor the PDCCH and the random access response when the random access response window is running in step S515; maintain a first counter in step S516.

[0239] For Second node N52 , send a first RRC message in step S521; send a second RRC message in step S522; receive a first random access preamble in a first PRACH opportunity in step S523; send the PDCCH and the random access response in step S524.

[0240] In Embodiment 5, send a first random access preamble in a first PRACH opportunity; start a random access response window; monitor the PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule the random access response; maintain a first counter; wherein, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter by 1; determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain; the first PRACH opportunity includes Q symbols in the time domain, the Q symbols are all SBFD symbols, or the Q symbols are all non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; wherein, the Q is a positive integer greater than 1, and the SBFD symbols include a first subband used for SBFD operation; receive a first RRC message, the first RRC message indicating the frequency domain position of the first subband and the time domain position of the SBFD symbol; wherein, the first subband is located in the UL BWP in the frequency domain; receive a second RRC message, the second RRC message configuring a set of target PRACH opportunities, the set of target PRACH opportunities including a plurality of PRACH opportunities; wherein, the first PRACH opportunity is one of the set of target PRACH opportunities; some of the plurality of PRACH opportunities include Q symbols in the time domain that are all non-SBFD symbols, and the remaining part of the plurality of PRACH opportunities include at least one SBFD symbol in the Q symbols included in the time domain; the first random access preamble belongs to a target random access preamble group, and the target random access preamble group is only available for SBFD-aware nodes, and the first node is the SBFD-aware node.

[0241] As an example, the second node N52 is a serving base station of the serving cell of the first node N51.

[0242] As an example, the second node N52 is a Transmit / Receive Point (TRP) of the serving cell of the first node N51.

[0243] As an example, the second node N52 is a serving base station of the master cell group (MCG) of the first node N51.

[0244] As an example, the second node N52 is a serving base station of the Secondary cell group (SCG) of the first node N51.

[0245] As an example, the second node N52 is a MgNB (master gNB).

[0246] As an example, the second node N52 is an SgNB (secondary gNB).

[0247] As an example, a first RRC message is received.

[0248] As an example, the first RRC message is carried in a SIB (System Information Block).

[0249] As an example, the first RRC message is a cell-specific message.

[0250] As an example, the first RRC message is a higher layer message.

[0251] As an example, the first RRC message is RRC signaling.

[0252] As an example, the first RRC message includes at least one IE (Information Element) in the RRC signaling.

[0253] As an example, the first RRC message includes at least one field in an IE in the RRC signaling.

[0254] As an example, the first RRC message includes some or all fields in the RRCReconfiguration (RRC reconfiguration) IE.

[0255] As an embodiment, the first RRC message includes some or all fields in the RRC Resume IE.

[0256] As an embodiment, the first RRC message includes some or all fields in the ServingCellConfig IE.

[0257] As an embodiment, the first RRC message indicates the frequency domain position of the first sub-band.

[0258] As an embodiment, the first sub-band is located in the UL BWP in the frequency domain.

[0259] As an embodiment, at least some fields in the RRC IE for configuring the UL BWP are used to configure the first sub-band.

[0260] As a sub-embodiment of the above embodiment, some fields in the RRC IE for configuring the UL BWP are used to configure the specific parameters of the first sub-band.

[0261] As an embodiment, the name of the first RRC message includes SBFD.

[0262] As an embodiment, the first RRC message includes SBFDConfig (sub-band full-duplex configuration).

[0263] As an embodiment, the first RRC message includes SBFD-UplinkConfig (sub-band full-duplex uplink configuration).

[0264] As an embodiment, the first RRC message explicitly indicates the frequency domain position of the first sub-band.

[0265] As an embodiment, the first RRC message implicitly indicates the frequency domain position of the first sub-band.

[0266] As an embodiment, the frequency domain position includes the frequency domain start position and the bandwidth.

[0267] As an embodiment, the frequency domain position includes the frequency domain end position and the bandwidth.

[0268] As an embodiment, the frequency domain position includes the frequency domain start position and the frequency domain end position.

[0269] As an embodiment, the bandwidth of the first sub-band is less than the bandwidth of the UL BWP.

[0270] As an embodiment, the first sub-band includes one RB, or multiple RBs that are continuous in the frequency domain.

[0271] As an example, the UL BWP is an active UL BWP.

[0272] As an example, the UL BWP is an initial UL BWP.

[0273] As an example, the UL BWP is a default UL BWP.

[0274] As an example, the first RRC message indicates the time domain position of the SBFD symbol.

[0275] As an example, the time domain position of the SBFD symbol is the time domain position of the first sub-band.

[0276] As an example, the first RRC message explicitly indicates the time domain position of the SBFD symbol.

[0277] As an example, the first RRC message implicitly indicates the time domain position of the SBFD symbol.

[0278] As an example, a second RRC message is received, and the second RRC message configures a set of target PRACH opportunities.

[0279] As an example, the set of target PRACH opportunities includes multiple PRACH opportunities.

[0280] As an example, the second RRC message is carried in the SIB.

[0281] As an example, the second RRC message is a cell-specific message.

[0282] As an example, the second RRC message is a group-specific message.

[0283] As an example, the second RRC message is a UE-specific message.

[0284] As an example, the second RRC message is a higher layer message.

[0285] As an example, the second RRC message is RRC signaling.

[0286] As an example, the second RRC message includes at least one IE in the RRC signaling.

[0287] As an example, the second RRC message includes at least one field in an IE in the RRC signaling.

[0288] As an embodiment, the second RRC message includes RACH-ConfigCommon (Random Access Channel Common Configuration).

[0289] As an embodiment, the second RRC message includes RACH-ConfigCommonTwoStepRA (Random Access Channel Common Configuration in Two-Step Random Access).

[0290] As an embodiment, the second RRC message includes RACH-ConfigGeneric (Random Access Channel Generic Configuration).

[0291] As an embodiment, the second RRC message includes RACH-ConfigGenericTwoStepRA (Random Access Channel Generic Configuration in Two-Step Random Access).

[0292] As an embodiment, the second RRC message includes RACH-ConfigDedicated (Random Access Channel Dedicated Configuration).

[0293] As an embodiment, the second RRC message includes AdditionalRACH-Config (Additional Random Access Channel Configuration).

[0294] As an embodiment, the second RRC message indicates the position of the target PRACH opportunity set in the time domain.

[0295] As an embodiment, the second RRC message indicates the subframe, time slot in the time domain of the target PRACH opportunity set, as well as the starting symbol and the number of symbols included in the time slot.

[0296] As an embodiment, the target PRACH opportunity set includes multiple time slots in the time domain.

[0297] As an embodiment, the target PRACH opportunity set includes periodic PRACH opportunities in the time domain.

[0298] As an embodiment, the second RRC message indicates the position of the target PRACH opportunity set in the frequency domain.

[0299] As an embodiment, the second RRC message indicates that K PRACH opportunities are included in a time instance.

[0300] As an embodiment, K is a positive integer.

[0301] As an example, the value of K is one of 1, 2, 4, and 8.

[0302] As an example, the K PRACH opportunities included in the one time instance are frequency division multiplexed (FDM).

[0303] As an example, the K PRACH opportunities included in the one time instance are continuous in the frequency domain.

[0304] As an example, the second RRC message indicates the starting frequency domain position of the K PRACH opportunities included in the one time instance.

[0305] As an example, the second RRC message indicates the offset of the lowest frequency domain PRACH opportunity among the K PRACH opportunities included in the one time instance relative to PRB (Physical Resource Block) 0.

[0306] As an example, the one time instance includes the duration in the time domain of one PRACH opportunity included in the target PRACH opportunity.

[0307] As an example, the one time instance includes the duration in the time domain of one PRACH resource included in the target PRACH opportunity.

[0308] As an example, the one time instance includes the duration occupied by sending the first random access preamble.

[0309] As an example, the second RRC message indicates the duration of the one time instance.

[0310] As an example, the first PRACH opportunity is one of the target PRACH opportunity set.

[0311] As an example, the first PRACH opportunity is the same as one of the K PRACH opportunities in the frequency domain.

[0312] As an example, the first PRACH opportunity is selected by the first node from the multiple PRACH opportunities included in the target PRACH opportunity set.

[0313] As an example, some of the plurality of PRACH opportunities included in the target PRACH opportunity set include only non-SBFD symbols in the time domain, and the remaining PRACH opportunities included in the plurality of PRACH opportunities included in the target PRACH opportunity set include at least one SBFD symbol in the symbols included in the time domain.

[0314] As an example, the target PRACH opportunity set includes only the first type of PRACH opportunity and the second type of PRACH opportunity.

[0315] As an example, the target PRACH opportunity set includes only the first type of PRACH opportunity and the third type of PRACH opportunity.

[0316] As an example, the target PRACH opportunity set includes only the second type of PRACH opportunity and the third type of PRACH opportunity.

[0317] As an example, the target PRACH opportunity set includes the first type of PRACH opportunity, the second type of PRACH opportunity, and the third type of PRACH opportunity.

[0318] As an example, the first random access preamble belongs to the target random access preamble group.

[0319] As an example, the target random access preamble group includes at least one random access preamble.

[0320] As an example, the first random access preamble is preferentially selected from the target random access preamble group.

[0321] As an example, the first random access preamble is randomly selected with equal probability from the target random access preamble group.

[0322] As an example, the target random access preamble group is associated with an SBFD feature.

[0323] As an example, the target random access preamble group is only available for SBFD-aware nodes.

[0324] As an example, the first node is the SBFD-aware node.

[0325] As an example, the SBFD awareness supports SBFD operations.

[0326] As an embodiment, in a TDD (Time Division Duplex) system, the SBFD operation is to receive an uplink signal in an uplink sub-band in the SBFD symbol while transmitting a downlink signal in a downlink sub-band; wherein, the SBFD operation is performed at a base station.

[0327] As an embodiment, the SBFD operation is performed at a UE.

[0328] As a sub-embodiment of the above embodiment, the UE supports uplink transmission and downlink reception simultaneously in one symbol.

[0329] As an embodiment, the SBFD operation is performed at a base station.

[0330] As a sub-embodiment of the above embodiment, the base station supports downlink transmission and uplink reception simultaneously in one symbol.

[0331] As an embodiment, after receiving the first random access preamble, the second node N52 generates the random access response and schedules the transmission of the random access response by indicating a downlink allocation through the PDCCH.

[0332] Example 6

[0333] Embodiment 6 exemplifies a schematic diagram of the relationship between an SBFD symbol and a first sub-band according to an embodiment of the present application, as shown in the appendix Figure 6 shown. In the appendix Figure 6 the obliquely filled rectangular box represents the first sub-band, and the grid-filled rectangular box represents the guard band.

[0334] As an embodiment, the downlink symbol including the first sub-band is defined as an SBFD symbol.

[0335] As an embodiment, the time domain position of the SBFD symbol is in a downlink symbol.

[0336] As a sub-embodiment of the above embodiment, the downlink symbol is configured by TDD-UL-DL-ConfigCommon (Time Division Duplex Uplink-Downlink Common Configuration).

[0337] As a sub-embodiment of the above embodiment, the downlink symbol is configured by TDD-UL-DL-ConfigDedicated (Time Division Duplex Uplink-Downlink Dedicated Configuration).

[0338] As a sub - embodiment of the above - mentioned embodiment, the downlink symbol is configured as a Flexible symbol by TDD - UL - DL - ConfigCommon or by TDD - UL - DL - ConfigDedicated, and is dynamically indicated as a downlink symbol.

[0339] As an embodiment, the first RRC message indicates the time - domain position of the SBFD symbol.

[0340] As an embodiment, the first RRC message indicating the time - domain position of the SBFD symbol includes: the first RRC message indicates the SBFD symbol pattern in a time period.

[0341] As an embodiment, one time period includes one slot.

[0342] As an embodiment, one time period includes multiple slots.

[0343] As an embodiment, one slot includes multiple symbols.

[0344] As an embodiment, one time period is the same as dl - UL - TransmissionPeriodicity in TDD - UL - DL - ConfigCommon.

[0345] As an embodiment, one time period is an integer multiple of dl - UL - TransmissionPeriodicity in TDD - UL - DL - ConfigCommon.

[0346] As an embodiment, the SBFD symbol pattern includes the starting position and the number of continuous symbols of the SBFD symbol in a time period.

[0347] Specifically, one time period includes 5 slots, namely D1, D2, D3, D4 and U5, where D represents a downlink slot and U represents an uplink slot, and each slot includes 14 symbols; the SBFD symbol pattern indicates that symbol 5 and the following 20 symbols are SBFD symbols.

[0348] As an embodiment, the SBFD symbol pattern includes the DL slots in a time period and the starting position and the number of continuous symbols of the SBFD symbol in the DL slots.

[0349] Specifically, a time period includes 5 time slots, namely D1, D2, D3, D4, and U5, where D represents a downlink time slot and U represents an uplink time slot. Each time slot includes 14 symbols. The SBFD pattern indicates symbol 7 in D1 and the 6 subsequent symbols, that is, symbols 7 - 13 are SBFD symbols, and symbol 0 in D2 and the 6 subsequent symbols, that is, symbols 0 - 6 are SBFD symbols.

[0350] As an embodiment, the first RRC message includes a bitmap. Each bit in the bitmap indicates whether the corresponding symbol included in a time period is an SBFD symbol or a non - SBFD symbol.

[0351] Specifically, a time period includes 1 time slot. The 1 time slot includes 14 symbols. The bitmap includes 14 bits. Each of the 14 bits indicates whether the corresponding 14 symbols are SBFD symbols or non - SBFD symbols. For example, when a bit is set to 1, it indicates an SBFD symbol, and when a bit is set to 0, it indicates a non - SBFD symbol; or when a bit is set to 1, it indicates a non - SBFD symbol, and when a bit is set to 0, it indicates an SBFD symbol.

[0352] As an embodiment, the SBFD symbols include the first sub - band used for SBFD operations.

[0353] As an embodiment, the first sub - band is an uplink sub - band (UL subband).

[0354] As an embodiment, the first RRC message indicates that the transmission direction on the first sub - band is uplink.

[0355] As an embodiment, the first RRC message indicates the frequency - domain position of the first sub - band.

[0356] As an embodiment, the first RRC message indicating the frequency - domain position of the first sub - band includes: the first RRC message indicates the sub - band pattern, and the sub - band pattern is {DUD} or {DU}; where D represents a downlink sub - band and U represents an uplink sub - band, that is, the first sub - band.

[0357] As an embodiment, the first RRC message indicates the frequency - domain starting position of the first sub - band and the number of consecutive RBs (resource blocks) included in the first sub - band.

[0358] As an embodiment, the first RRC message indicates at least one of the frequency - domain position of the guard band and the frequency - domain position of the downlink sub - band.

[0359] As an example, the first sub-band is used for uplink transmission.

[0360] As an example, the downlink sub-band includes frequency-domain resources for downlink reception.

[0361] As an example, the first RRC message indicates that the downlink sub-band is configured for downlink transmission.

[0362] As an example, the first sub-band and the downlink sub-band are separated by the guard band.

[0363] As an example, the guard band is not used for wireless transmission.

[0364] As an example, the first RRC message indicates the subcarrier spacing of the first sub-band.

[0365] As an example, the first sub-band and the downlink sub-band are configured with the same subcarrier spacing.

[0366] As an example, the first sub-band and the downlink sub-band are configured with different subcarrier spacings.

[0367] As an example, the first sub-band and the downlink sub-band are configured with different transmission directions.

[0368] As an example, the first PRACH opportunity is located in the first sub-band in the frequency domain.

[0369] In Example 6, the downlink sub-band and the first sub-band are isolated by the guard band.

[0370] In Case A of Example 6, the channel bandwidth includes two downlink sub-bands and the first sub-band, where the two downlink sub-bands are located at both ends of the channel bandwidth respectively, and the first sub-band is located at the center of the channel bandwidth.

[0371] In Case B of Example 6, the channel bandwidth includes one downlink sub-band and the first sub-band, which are located at both ends of the channel bandwidth respectively.

[0372] Example 7

[0373] Example 7 illustrates a schematic diagram of a target PRACH opportunity set according to an embodiment of the present application and the symbols included in the first PRACH in the time domain, as shown in the appendix Figure 7 shown. In the appendix Figure 7 The rectangular boxes filled with slashes represent SBFD symbols.

[0374] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain; wherein, the Q is a positive integer greater than 1.

[0375] As an embodiment, the Q symbols are in the same time slot.

[0376] As an embodiment, the Q symbols span time slots, that is, in different time slots.

[0377] As an embodiment, the Q is configured by the second RRC message.

[0378] As an embodiment, all of the Q symbols are the SBFD symbols.

[0379] As a sub - embodiment of the above - mentioned embodiment, the first PRACH opportunity is in the first sub - band in the frequency domain.

[0380] As an embodiment, all of the Q symbols are non - SBFD symbols.

[0381] As a sub - embodiment of the above - mentioned embodiment, the first PRACH opportunity is in the UL BWP in the frequency domain.

[0382] As an embodiment, at least one SBFD symbol and at least one non - SBFD symbol are included in the Q symbols.

[0383] As a sub - embodiment of the above - mentioned embodiment, the Q symbols start with the at least one SBFD symbol and end with the at least one non - SBFD symbol.

[0384] As a sub - embodiment of the above - mentioned embodiment, the first PRACH opportunity is in the first sub - band in the frequency domain for the at least one SBFD symbol included in the time domain, the first PRACH opportunity is in the UL BWP in the frequency domain for the at least one SBFD symbol included in the time domain, and the frequency domains in the first sub - band and in the UL BWP have the same bandwidth.

[0385] Appendix of Embodiment 7 Figure 7Among them, the target PRACH opportunity set includes PRACH opportunities at three discontinuous time instances in the time domain, and includes 4 frequency-domain continuous PRACH opportunities in each time instance. Each PRACH opportunity includes Q = 6 symbols in the time domain; among them, the 4 PRACH opportunities included in the first time instance include 6 SBFD symbols in the time domain; the 4 PRACH opportunities included in the second time instance include 4 SBFD symbols and 2 non-SBFD symbols in the time domain; the 4 PRACH opportunities included in the third time instance include 6 non-SBFD symbols in the time domain; among them, the non-SBFD symbols are uplink symbols.

[0386] As an embodiment, the first PRACH opportunity is one of the target PRACH opportunity sets.

[0387] As an embodiment, after the first data access process is initiated, the first available PRACH opportunity selected by the first node from the target PRACH opportunity set is the first PRACH opportunity.

[0388] Example 8

[0389] Embodiment 8 exemplifies a signal processing flowchart in a first node according to an embodiment of the present application, as shown in the appendix Figure 8 as shown.

[0390] In Embodiment 8, the first node determines in step S801 whether all Q symbols are non-SBFD symbols. If so, it executes step S802. If not, it executes step S803; in step S802, the value of the first counter is incremented by 1; in step S803, it ends.

[0391] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when all the Q symbols are the non-SBFD symbols, it is determined to increment the value of the first counter by 1.

[0392] As an embodiment, the interference received on the non-SBFD symbols is generally much smaller than the interference received on the SBFD symbols. The above method can effectively utilize the reception on the non-SBFD symbols and avoid causing a large delay by repeatedly performing the random access process in a cell with poor channel quality.

[0393] Example 9

[0394] Embodiment 9 exemplifies a signal processing flowchart in a first node according to an embodiment of the present application, as shown in the appendixFigure 9 as shown

[0395] In Embodiment 9, the first node determines in step S901 whether the number of non-SBFD symbols included in Q symbols is greater than the number of SBFD symbols included in the Q symbols. If so, step S902 is executed; if not, step S903 is executed. In step S902, the value of the first counter is incremented by 1. In step S903, it ends.

[0396] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is greater than the number of SBFD symbols included in the Q symbols, it is determined to increment the value of the first counter.

[0397] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is equal to the number of SBFD symbols included in the Q symbols, it is determined to increment the value of the first counter.

[0398] As a sub-embodiment of the above two embodiments, the interference received on the non-SBFD symbols is generally much less than the interference received on the SBFD symbols. The above method can effectively utilize the reception on the non-SBFD symbols and avoid large delays caused by repeatedly performing the random access process in cells with poor channel quality.

[0399] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is less than the number of SBFD symbols included in the Q symbols, it is determined not to increment the value of the first counter.

[0400] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is equal to the number of SBFD symbols included in the Q symbols, it is determined not to increment the value of the first counter.

[0401] As a sub - embodiment of the above two embodiments, the interference received on the SBFD symbol is generally much greater than that received on the non - SBFD symbol, and the above method can avoid random access problems caused by strong interference.

[0402] As an embodiment, the number of non - SBFD symbols included in the Q symbols being greater than the number of SBFD symbols included in the Q symbols is: the ratio of the number of non - SBFD symbols included in the Q symbols to the number of SBFD symbols included in the Q symbols is greater than 1 / 2.

[0403] Example 10

[0404] Embodiment 10 exemplifies the signal processing flowchart in the first node according to an embodiment of the present application, as shown in the appendix Figure 10 as follows.

[0405] In Embodiment 10, the first node determines in step S1001 whether the number of non - SBFD symbols included in the Q symbols is greater than the first threshold. If so, it executes step S1002; if not, it executes step S1003. In step S1002, the value of the first counter is incremented by 1. In step S1003, it ends.

[0406] As an embodiment, the determination of whether to increment the value of the first counter depends on the number of non - SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non - SBFD symbols included in the Q symbols is greater than the first threshold, it is determined to increment the value of the first counter.

[0407] As an embodiment, the determination of whether to increment the value of the first counter depends on the number of non - SBFD symbols in the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non - SBFD symbols included in the Q symbols is equal to the first threshold, it is determined to increment the value of the first counter.

[0408] As a sub - embodiment of the above two embodiments, the interference received on the non - SBFD symbol is generally much less than that received on the SBFD symbol, and the above method can effectively utilize the reception on the non - SBFD symbol and avoid large delays caused by repeatedly performing the random access process in cells with poor channel quality.

[0409] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is less than a first threshold, it is determined not to increment the value of the first counter.

[0410] As an embodiment, determining whether to increment the value of the first counter depends on the number of non-SBFD symbols among the symbols included in the first PRACH opportunity in the time domain, including: the first PRACH opportunity includes Q symbols in the time domain; when the number of non-SBFD symbols included in the Q symbols is equal to the first threshold, it is determined not to increment the value of the first counter.

[0411] As a sub-embodiment of the above two embodiments, the interference received on the SBFD symbols is generally much greater than that received on the non-SBFD symbols, and the above method can avoid random access problems caused by strong interference.

[0412] As an embodiment, the first threshold is configured.

[0413] As an embodiment, the first threshold is pre-configured.

[0414] Example 11

[0415] Embodiment 11 exemplifies a signal processing flowchart in a first node according to an embodiment of the present application, as shown in the appendix Figure 11 as follows.

[0416] In Embodiment 11, the first node determines in step S1101 whether the random access response window has expired and the random access response has not been successfully received. If so, it executes step S1102; if not, it executes step S1106. In step S1102, it determines whether to increment the value of the first counter. If so, it executes step S1103; if not, it executes step S1106. In step S1103, the value of the first counter is incremented. In step S1104, it determines whether the value of the first counter has reached a second threshold. If so, it executes step S1105; if not, it executes step S1106. In step S1105, it indicates a random access problem to the upper layer. In step S1106, it ends.

[0417] As an embodiment, when the first random access preamble is sent on the SpCell and the value of the first counter reaches the second threshold, a random access problem is indicated to the upper layer; wherein, the first node is in the RRC connected state.

[0418] As an example, once receiving an indication of the random access problem, the first node considers that a Radio Link Failure (RLF) is detected.

[0419] As an example, the upper layer is the RRC layer.

[0420] As an example, the second threshold is configured.

[0421] As an example, the second threshold is preambleTransMax + 1, where preambleTransMax is configured.

[0422] As an example, the SpCell (Special Cell) is the PCell (Primary Cell).

[0423] As a sub - example of the above example, the SpCell belongs to the MCG (Master Cell Group).

[0424] As an example, the SpCell is the PSCell (Primary SCG Cell).

[0425] As a sub - example of the above example, the SpCell belongs to the SCG (Secondary Cell Group).

[0426] Example 12

[0427] Embodiment 12 exemplifies a structural block diagram of a processing device in a first node according to an embodiment of the present application, as shown in the appendix Figure 12 shown. In the appendix Figure 12 the first node processing device 1200 includes a first receiver 1201 and a first transmitter 1202; the first node 1200 is a UE, or the first node 1200 is a terminal.

[0428] In Embodiment 12, a first transmitter 1202 transmits a first random access preamble in a first PRACH opportunity; a first receiver 1201 starts a random access response window; monitors a PDCCH when the random access response window is running, and the downlink allocation indicated by the PDCCH is used to schedule a random access response; maintains a first counter; wherein, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to increment the value of the first counter by 1; determining whether to increment the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the first PRACH opportunity in the time domain.

[0429] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; wherein, Q is a positive integer greater than 1.

[0430] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; wherein, Q is a positive integer greater than 1; when all of the Q symbols are non-SBFD symbols, it is determined to increment the value of the first counter by 1.

[0431] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; wherein, Q is a positive integer greater than 1; when the number of non-SBFD symbols included in the Q symbols is greater than the number of SBFD symbols included in the Q symbols, it is determined to increment the value of the first counter by 1.

[0432] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; wherein, Q is a positive integer greater than 1; when the number of non-SBFD symbols included in the Q symbols is greater than a first threshold, it is determined to increment the value of the first counter by 1; wherein, the first threshold is configured or pre-configured.

[0433] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, where all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; where Q is a positive integer greater than 1; the SBFD symbol is a symbol including a first subband used for SBFD operations.

[0434] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, where all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; where Q is a positive integer greater than 1; the SBFD symbol is a symbol including a first subband used for SBFD operations; the first receiver 1201 receives a first RRC message, and the first RRC message indicates the frequency domain position of the first subband and the time domain position of the SBFD symbol; where the first subband is located in the UL BWP in the frequency domain.

[0435] As an embodiment, the first PRACH opportunity includes Q symbols in the time domain, where all of the Q symbols are SBFD symbols, or all of the Q symbols are non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; where Q is a positive integer greater than 1; the first receiver 1201 receives a second RRC message, and the second RRC message configures a set of target PRACH opportunities, and the set of target PRACH opportunities includes multiple PRACH opportunities; where the first PRACH opportunity is one of the set of target PRACH opportunities; some of the multiple PRACH opportunities include all non-SBFD symbols among the Q symbols in the time domain, and the remaining PRACH opportunities among the multiple PRACH opportunities include at least one SBFD symbol among the Q symbols in the time domain.

[0436] As an embodiment, the first random access preamble belongs to a target random access preamble group, and the target random access preamble group is only available for SBFD sensing nodes, and the first node is the SBFD sensing node.

[0437] As an embodiment, the first transmitter 1202 indicates a random access problem to the upper layer when the value of the first counter reaches a second threshold; where the first random access preamble is transmitted on the SpCell; the second threshold is configured.

[0438] As an embodiment, the first receiver 1201 includes the appendix of this application Figure 4The receiver 454 (including antenna 452), receiving processor 456, multi-antenna receiving processor 458, and controller / processor 459 therein.

[0439] As an example, the first receiver 1201 includes the attachment in this application Figure 4 at least one of the receiver 454 (including antenna 452), receiving processor 456, multi-antenna receiving processor 458, or controller / processor 459 therein.

[0440] As an example, the first transmitter 1202 includes the attachment in this application Figure 4 the transmitter 454 (including antenna 452), transmitting processor 468, multi-antenna transmitting processor 457, and controller / processor 459 therein.

[0441] As an example, the first transmitter 1202 includes the attachment in this application Figure 4 at least one of the receiver 454 (including antenna 452), transmitting processor 468, multi-antenna transmitting processor 457, or controller / processor 459 therein.

[0442] Those of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, hard disk, or optical disc, etc. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above embodiments can be implemented in hardware form or in the form of a software function module. This application is not limited to any specific form of the combination of software and hardware. The first type of communication node or UE or terminal in this application includes, but is not limited to, wireless communication devices such as mobile phones, tablet computers, laptops, wireless network cards, low-power devices, eMTC (enhanced Machine Type Communication) devices, NB-IoT devices, vehicle-mounted communication devices, aircraft, airplanes, drones, and remote control airplanes. The second type of communication node or base station or network-side device in this application includes, but is not limited to, wireless communication devices such as macrocell base stations, microcell base stations, home base stations, relay base stations, eNBs, gNBs, transmission and reception points TRP (Transmission and Reception Point), relay satellites, satellite base stations, and aerial base stations.

[0443] The above are only the preferred embodiments of this application and are not intended to limit the protection scope of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method in a first node for wireless communication, characterized in that: include: Sending a first random access preamble in a first PRACH opportunity; Start random access response window; monitoring a PDCCH when the random access response window is running, wherein the downlink allocation indicated by the PDCCH is used to schedule a random access response; maintaining a first counter; Among them, maintaining the first counter includes: when the random access response window expires and the random access response is not successfully received, determining whether to add 1 to the value of the first counter; the determination of whether to add 1 to the value of the first counter depends on the number of non-SBFD symbols in the symbols included in the time domain of the first PRACH opportunity.

2. The method in the first node according to claim 1, characterized in that: The first PRACH opportunity includes Q symbols in the time domain, the Q symbols are all SBFD symbols, or the Q symbols are all non-SBFD symbols, or the Q symbols include at least one SBFD symbol and at least one non-SBFD symbol; Wherein, Q is a positive integer greater than 1.

3. The method in the first node according to claim 2, characterized in that: When the Q symbols are all the non-SBFD symbols, it is determined to increase the value of the first counter by 1.

4. The method in the first node according to claim 2 or 3, characterized in that: When the number of the non-SBFD symbols included in the Q symbols is greater than the number of the SBFD symbols included in the Q symbols, it is determined to increase the value of the first counter by 1.

5. The method in the first node according to any one of claims 2 to 4, characterized in that: When the number of the non-SBFD symbols included in the Q symbols is greater than a first threshold, determining to add 1 to the value of the first counter; The first threshold is configured or pre-configured.

6. The method in the first node according to any one of claims 2 to 5, characterized in that: The SBFD symbol is a symbol including a first subband used for SBFD operation.

7. The method in the first node according to claim 6, characterized in that: include: receiving a first RRC message, wherein the first RRC message indicates a frequency domain position of the first subband and a time domain position of the SBFD symbol; The first subband is located in the UL BWP in the frequency domain.

8. The method in the first node according to any one of claims 2 to 7, characterized in that: include: receiving a second RRC message, wherein the second RRC message configures a target PRACH opportunity set, wherein the target PRACH opportunity set includes a plurality of PRACH opportunities; Among them, the first PRACH opportunity is one of the target PRACH opportunity set; the Q symbols included in the time domain of some of the multiple PRACH opportunities are all non-SBFD symbols, and the remaining PRACH opportunities in the multiple PRACH opportunities include at least one SBFD symbol in the Q symbols included in the time domain.

9. The method in the first node according to any one of claims 1 to 8, characterized in that: The first random access preamble belongs to a target random access preamble group, the target random access preamble group is available only for a SBFD-aware node, and the first node is the SBFD-aware node.

10. The method in the first node according to any one of claims 1 to 9, characterized in that: include: When the value of the first counter reaches a second threshold, indicating a random access problem to an upper layer; The first random access preamble is sent on the SpCell; and the second threshold is configured.

11. A terminal, characterized in that: The terminal includes: one or more processors and a memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, where the computer program codes include computer instructions. The one or more processors call the computer instructions to enable the terminal to execute the method according to any one of claims 1 to 10.

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