Method used in wireless communication, and apparatus

Abstract

Disclosed in the present application are a method used in wireless communication, and an apparatus. The method comprises: a first node receiving an SSB in a first cell and selecting the first cell, the SSB indicating that only an on-demand SIB1 is transmitted in the first cell; and transmitting a PRACH on the first cell or executing a cell reselection. Whether the first node transmits the PRACH on the first cell or executes the cell reselection depends on whether a target configuration is available at the first node. The target configuration comprises at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, and the first configuration is associated with the first cell; the second configuration indicates a second random access resource, and the second configuration is not associated with the first cell. When the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource. The present application facilitates network energy saving and reduces the delay in SIB1 acquisition.

Description

A method and apparatus for use in wireless communication

[0001] This application claims priority to Chinese Patent Application No. 202411564287.0, filed on November 4, 2024, entitled "A Method and Apparatus for Wireless Communication", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to methods and apparatus in wireless communication systems, and more particularly to methods and apparatus for on-demand SIB requests in wireless communication. Background Technology

[0003] The application scenarios of future wireless communication systems are becoming increasingly diversified, and different application scenarios place different performance requirements on the system. To meet the diverse performance needs of various application scenarios, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #72 plenary meeting decided to research NR (New Radio) technology (or Fifth Generation, 5G). The NR WI (Work Item) was approved at the 3GPP RAN #75 plenary meeting, initiating standardization work for NR. The design of the 5G system in Release 15 has already considered some major application scenarios. Subsequent versions will not only consider enhancements to the 5G system architecture but will also further enhance vertical applications to provide more flexible service matching, more robust transmission, and a more consistent user experience.

[0004] With the rapid development of 5G, base station deployments are becoming denser, and the periodic transmission of system information consumes a significant portion of the network's power. Network energy saving (NES) is crucial for environmental sustainability, reducing environmental impact, and saving operating costs. Due to the demands of higher data rates, denser networks, more antennas, greater bandwidth, and more frequency bands, the environmental impact of wireless communication systems needs to be controlled. 3GPP Release 19 (Release 19) established the "Enhancing Network Energy Saving for NR" working group to research more effective network energy saving solutions. Summary of the Invention

[0005] The inventors discovered through research that in conventional technologies, a cell's SIB1 (System Information Block 1) is sent periodically, providing availability and scheduling information for other system information, as well as information about the serving cell, thus providing minimal system information for terminal access to the network. Further research is needed on how to effectively request on-demand SIB1 transmission based on WUS configuration if on-demand SIB1 transmission is supported in NES cells.

[0006] To address the aforementioned issues, this application discloses a solution that, in cells that do not periodically transmit SIB1, determines whether to initiate a random access procedure for on-demand SIB1 requests based on the availability of an uplink WUS (Wake Up Signal) configuration. This achieves network energy savings, reduces SIB1 acquisition latency, and enhances terminal energy efficiency. Where there is no conflict, the embodiments and features in the first node of this application can be applied to the second node, and vice versa. Where there is no conflict, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other. Where there is no conflict, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other. Although this application is initially intended for network energy saving scenarios, it is also applicable to other non-network energy saving scenarios facing similar problems, including but not limited to on-demand downlink data transmission. Furthermore, although this application is initially intended for SIB1 transmission, it can also be used for the transmission of other SIBs, including but not limited to SIB2 (System Information Block 2), SIB3 (System Information Block 3), etc., achieving similar technical effects. In addition, adopting a unified solution for different scenarios also helps reduce hardware complexity and cost. In particular, the interpretation of terms, nouns, functions and variables in this application (unless otherwise specified) can be found in the definitions in the 3GPP specification protocols TS36, TS38 and TS37 series.

[0007] This application discloses a method used in a first node of wireless communication, characterized by comprising:

[0008] In the first cell, receive the SSB (SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) block and select the first cell. The SSB indicates that only on-demand SIB1 (OD-SIB1) should be transmitted in the first cell.

[0009] Send PRACH (Physical Random Access Channel) on the first cell, or perform cell re-selection;

[0010] Whether the first node sends the PRACH or performs the cell reselection on the first cell depends on whether the target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node sends the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0011] As an example, the first cell is an NES cell.

[0012] As an example, the first cell supports on-demand SIB1.

[0013] As an example, SIB1 is not periodically transmitted in the first cell.

[0014] As an example, the first configuration is indicated by the network.

[0015] As an example, the first configuration is sent by the network to the UE via the air interface.

[0016] As one embodiment, associating the first configuration with the first cell includes: the first configuration is applied only to the first cell.

[0017] As one embodiment, associating the first configuration with the first cell includes: the first configuration being applied to multiple cells, the multiple cells including the first cell.

[0018] As one embodiment, associating the first configuration with the first cell includes: the first random access resource indicated by the first configuration is applied to initiate a random access procedure in the first cell.

[0019] As an example, the second configuration is predefined.

[0020] As one embodiment, the second configuration not being associated with the first cell includes: the second configuration can be applied to all cells that meet the criteria.

[0021] As one embodiment, the second configuration not being associated with the first cell includes: the second configuration being only related to the frequency domain resources occupied by the SSB.

[0022] As one embodiment, the second configuration not associated with the first cell includes: the random access resources in the second random access resources indicated by the second configuration that overlap with the frequency domain resources occupied by the SSB are used to initiate a random access procedure in the first cell.

[0023] As an example, the random access procedure is for requesting SIB1 on demand.

[0024] As an example, the on-demand SIB1 transmission based on the random access procedure can avoid the network periodically sending SIB1, which is beneficial for network energy saving.

[0025] As an example, both the first random access resource and the second random access resource are dedicated.

[0026] As an example, the random access procedure is CFRA (Contention Free Random Access).

[0027] As an example, by initiating a random access procedure request on demand (SIB1) on a dedicated random access resource, it is beneficial to reduce the SIB1 acquisition latency.

[0028] As one example, the first node is a terminal.

[0029] According to one aspect of this application, the above method is characterized in that the first configuration is available on the first node, and the PRACH is sent in the first random access resource indicated by the first configuration;

[0030] Wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

[0031] As one embodiment, the first configuration available on the first node includes: the first configuration being associated with the first cell.

[0032] As one embodiment, the first configuration available on the first node includes: the first configuration is associated with multiple cells, the multiple cells including the first cell.

[0033] According to one aspect of this application, the above method is characterized in that the second configuration is available on the first node, and the PRACH is sent in the second random access resource indicated by the second configuration;

[0034] The first node maintains only the second configuration.

[0035] As one embodiment, the second configuration available at the first node includes: the first cell satisfying the criteria for applying the second configuration.

[0036] As one embodiment, the second configuration available at the first node includes: the second random access resource includes the first frequency domain resource, and the first frequency domain resource overlaps with the frequency domain resource of the first cell.

[0037] According to one aspect of this application, the above method is characterized in that neither the first configuration nor the second configuration is available at the first node, and cell reselection is performed.

[0038] As an example, cell reselection is performed when no dedicated random access resources are configured for on-demand SIB1 requests.

[0039] As one embodiment, the first configuration being unavailable on the first node includes: the first node not receiving the first configuration associated with the first cell.

[0040] As one embodiment, the second configuration being unavailable on the first node includes: the first cell not meeting the criteria for applying the second configuration.

[0041] According to one aspect of this application, the above method is characterized by comprising:

[0042] The first configuration is received from the second cell, and the first configuration is associated with at least the first cell;

[0043] The second cell and the first cell are two different cells.

[0044] As one embodiment, the first configuration is received from a cell other than the first cell.

[0045] According to one aspect of this application, the above method is characterized in that the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlapping with the frequency domain resource of the first cell, the first frequency domain resource being capable of transmitting at least the PRACH.

[0046] As an example, the feature of the above method is that the random access resources in the second random access resources that overlap with the frequency domain resources of the first cell can be used to transmit the PRACH.

[0047] As one embodiment, the second configuration being unavailable on the first node includes: the second random access resources do not include random access resources that overlap with the frequency domain resources of the first cell.

[0048] According to one aspect of this application, the above method is characterized in that the frequency domain resources occupied by the SSB overlap with the first frequency domain resources.

[0049] As an example, the feature of the above method is that the random access resources in the second random access resources that overlap with the frequency domain resources occupied by the SSB can be used to transmit the PRACH.

[0050] As one embodiment, the second configuration being unavailable on the first node includes: the second random access resource does not include random access resources that overlap with the frequency domain resources occupied by the SSB.

[0051] According to one aspect of this application, the above method is characterized by comprising:

[0052] The first timer is started after a first time interval following the end of the PRACH transmission.

[0053] While the first timer is running, monitor the first PDCCH;

[0054] The first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving random access responses.

[0055] According to one aspect of this application, the above method is characterized by comprising:

[0056] The second timer is started after the second time interval following the first reference time;

[0057] While the second timer is running, the second PDCCH is monitored;

[0058] Wherein, the first reference time is associated with sending the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; and the second PDCCH indicates the reception of the on-demand SIB1 scheduling information.

[0059] According to one aspect of this application, the above method is characterized by comprising:

[0060] In response to receiving the on-demand SIB1, it camps on the first cell.

[0061] According to one aspect of this application, the above method is characterized by comprising:

[0062] As a response to the expiration of the second timer and the failure of the on-demand SIB1 to be received, cell reselection is performed.

[0063] As an example, performing cell reselection when the on-demand SIB1 is not successfully received before the second timer expires helps the terminal to select a suitable cell in a timely manner.

[0064] According to one aspect of this application, the above method is characterized in that the SSB includes a first field, and the candidate indication of the value of the first field is to send SIB1, not to send SIB1, and to send the on-demand SIB1.

[0065] This application discloses a terminal, characterized in that it includes:

[0066] The terminal includes: one or more processors and memory;

[0067] The memory is coupled to the one or more processors and is used to store computer program code, which includes computer instructions. The one or more processors invoke the computer instructions to cause the terminal to execute the method described above in the first node.

[0068] As one example, the terminal is a UE (User Equipment).

[0069] This application discloses a method used in a second node for wireless communication, characterized by comprising:

[0070] In the first cell, an SSB is sent, the SSB indicating that only on-demand SIB1 is sent in the first cell;

[0071] Wherein, the first cell is selected; the first node transmits a PRACH on the first cell or performs cell reselection; whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0072] In one embodiment, the second node is a base station.

[0073] According to one aspect of this application, the above method is characterized in that the first configuration is available on the first node, and the first node sends the PRACH in the first random access resource indicated by the first configuration;

[0074] Wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

[0075] According to one aspect of this application, the above method is characterized in that the second configuration is available on the first node, and the first node sends the PRACH in the second random access resource indicated by the second configuration;

[0076] The first node maintains only the second configuration.

[0077] According to one aspect of this application, the above method is characterized in that neither the first configuration nor the second configuration is available at the first node, and the first node performs the cell reselection.

[0078] According to one aspect of this application, the above method is characterized by comprising:

[0079] The first configuration is sent in the second cell, and the first configuration is associated with at least the first cell;

[0080] The second cell and the first cell are two different cells.

[0081] According to one aspect of this application, the above method is characterized in that the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlapping with the frequency domain resource of the first cell, the first frequency domain resource being capable of transmitting at least the PRACH.

[0082] According to one aspect of this application, the above method is characterized in that the frequency domain resources occupied by the SSB overlap with the first frequency domain resources.

[0083] According to one aspect of this application, the above method is characterized by comprising:

[0084] Send the first PDCCH;

[0085] Wherein, after the PRACH transmission ends, a first timer is started after a first time interval; while the first timer is running, the first PDCCH is monitored; the first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving random access responses.

[0086] According to one aspect of this application, the above method is characterized by comprising:

[0087] Send the second PDCCH;

[0088] Specifically, a second timer is started after a second time interval following a first reference time; during the operation of the second timer, the second PDCCH is monitored; the first reference time is associated with the transmission of the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the reception of the on-demand SIB1 scheduling information.

[0089] According to one aspect of this application, the above method is characterized by comprising:

[0090] Send SIB1 on demand;

[0091] In this context, the first node resides on the first cell as a response to the on-demand SIB1 received by the first node.

[0092] According to one aspect of this application, the above method is characterized in that, in response to the expiration of the second timer and the failure to receive the on-demand SIB1, the first node performs cell reselection.

[0093] According to one aspect of this application, the above method is characterized in that the SSB includes a first field, and the candidate indication of the value of the first field is to send SIB1, not to send SIB1, and to send the on-demand SIB1.

[0094] This application discloses a base station, characterized in that it includes:

[0095] The base station includes: one or more processors and a memory;

[0096] The memory is coupled to the one or more processors and is used to store computer program code, which includes computer instructions. The one or more processors invoke the computer instructions to cause the base station to perform the methods described above in the second node. Attached Figure Description

[0097] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0098] Figure 1 illustrates a transmission flowchart in a first node according to an embodiment of this application;

[0099] Figure 2 illustrates a schematic diagram of a network architecture according to an embodiment of this application;

[0100] Figure 3 illustrates a schematic diagram of the wireless protocol architecture of the user plane and control plane according to an embodiment of this application;

[0101] Figure 4 illustrates a schematic diagram of the hardware modules of a communication device according to an embodiment of this application;

[0102] Figure 5 illustrates a signal processing flowchart in a first node according to an embodiment of this application;

[0103] Figure 6 illustrates a wireless signal transmission flowchart between a first node and a second node according to an embodiment of this application;

[0104] Figure 7 illustrates a schematic diagram of the overlap between the first frequency domain resources and the frequency domain resources of the first cell according to an embodiment of this application;

[0105] Figure 8 illustrates a schematic diagram showing the overlap between the first frequency domain resource and the frequency domain resource occupied by the SSB according to an embodiment of this application;

[0106] Figure 9 illustrates a timing relationship diagram for monitoring a first PDCCH according to an embodiment of this application;

[0107] Figure 10 illustrates a schematic diagram of a timing relationship for monitoring a second PDCCH according to an embodiment of this application;

[0108] Figure 11 illustrates another wireless signal transmission flowchart between a first node and a second node according to an embodiment of this application;

[0109] Figure 12 illustrates yet another signal processing flowchart in a first node according to an embodiment of this application;

[0110] Figure 13 illustrates a structural block diagram of a processing apparatus in a first node according to an embodiment of this application;

[0111] Figure 14 illustrates a structural block diagram of a processing apparatus in a second node according to an embodiment of this application. Detailed Implementation

[0112] The technical solution of this application will be further described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0113] Example 1

[0114] Example 1 illustrates a transmission flowchart in a first node according to an embodiment of this application, as shown in Figure 1.

[0115] In Embodiment 1, in step 101, the first node 100 receives an SSB in a first cell and selects the first cell, the SSB indicating that only on-demand SIB1 should be transmitted in the first cell; in step 102, it transmits a PRACH on the first cell or performs cell reselection; wherein, whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0116] As an example, the first node is an R19 NES UE.

[0117] As an example, the first node supports OD-SIB1.

[0118] As an example, the first node supports requesting SIB1.

[0119] As an example, the first node is in the RRC idle (RRC_IDLE) state.

[0120] As an example, the first node is in an RRC inactive (RRC_INACTIVE) state.

[0121] As an example, the SSB is searched on the sync raster.

[0122] As an example, the SSB is periodically broadcast in the first cell.

[0123] As an example, the SSB is always-on.

[0124] As an example, the SSB is transmitted on the synchronization grid.

[0125] As an example, the SSB is a CD (cell-defined)-SSB.

[0126] As one example, the SSB includes synchronization signals and broadcast information.

[0127] As one embodiment, the synchronization signal includes the primary synchronization signal (PSS).

[0128] As one embodiment, the synchronization signal includes a secondary synchronization signal (SSS).

[0129] As an example, the synchronization signal indicates the cell identifier of the first cell.

[0130] As an example, the cell identifier is PCI (Physical Cell Identifier).

[0131] As an example, obtaining the cell identifier through the synchronization signal can refer to the 3GPP standard, which will not be elaborated here.

[0132] As an example, the broadcast information is carried by PBCH (Physical broadcast channel).

[0133] As an example, the broadcast information is located in the PBCH payload.

[0134] As one example, the broadcast information includes a MIB (Master Information Block).

[0135] As an example, the broadcast information is a MIB.

[0136] As an example, the broadcast information includes at least one field in the MIB.

[0137] As an example, the broadcast information indicates that SIB1 is only sent on demand in the first cell.

[0138] As an example, the broadcast information indicates that the first cell will not periodically broadcast SIB1.

[0139] As an example, the broadcast information indicates that SIB1 in the first cell needs to be requested by the UE to be sent.

[0140] As one embodiment, the SSB includes a first field indicating that SIB1 is transmitted only on demand in the first cell.

[0141] As a sub-implementation of the above embodiments, the first domain is in the MIB.

[0142] As an example, the value indicated by the first field is greater than 23 (decimal); wherein the frequency band in which the first cell is located belongs to FR1 (Frequency Range 1).

[0143] As an example, the value indicated by the first field is greater than 11 (decimal); wherein the frequency band in which the first cell is located belongs to FR2 (Frequency Range 2).

[0144] As an example, the first field is 4 bits, and the first field is a binary value greater than or equal to 1100.

[0145] As an example, the first field is 5 bits, and the first field is a binary value greater than or equal to 11100.

[0146] As an example, the candidate values ​​of the first field respectively indicate periodically sending SIB1, not sending SIB1, and sending the on-demand SIB1.

[0147] As a sub-implementation of the above embodiments, the above method explicitly indicates through the first domain to periodically send SIB1 in the cell, or not send SIB, or send the SIB1 on demand.

[0148] As an example, when the first field included in the SSB indicates that SIB1 is periodically transmitted, SIB1 is periodically transmitted in the first cell.

[0149] As an example, when the value of the first field included in the SSB indicates that SIB1 is not sent, SIB1 is not periodically sent in the first cell.

[0150] As an example, when the value of the first field included in the SSB indicates that the on-demand SIB1 is to be sent, the on-demand SIB1 is sent in the first cell.

[0151] As an example, the first field is K1 bits, and the candidate values ​​for the first field are 0 to 2. K1 -1, wherein the first part of the value indicates that SIB1 is sent periodically, the second part of the value indicates that SIB1 is not sent, and the third part of the value indicates that the on-demand SIB1 is sent; wherein the first part of the value, the second part of the value, and the third part of the value are orthogonal; wherein, K1 is a positive integer greater than 1.

[0152] Specifically, the first field is K1 = 4 bits. When the first field indicates a value between 0000 and 1011, it indicates that SIB1 is sent periodically; when the first field indicates a value between 1100 and 1110, it indicates that the on-demand SIB1 is sent; when the first field indicates 1111, it indicates that SIB1 is not sent.

[0153] Specifically, the first field is K1 = 5 bits. When the first field indicates a value between 00000 and 01011, it indicates that SIB1 is sent periodically; when the first field indicates a value between 11000 and 11011, it indicates that the on-demand SIB1 is sent; when the first field indicates other remaining values, it indicates that SIB1 is not sent.

[0154] As an example, the first field is ssb-SubcarrierOffset (SSB subcarrier offset).

[0155] As an example, the K1 bit indicating the first field is provided by ssb-SubcarrierOffset.

[0156] As a sub-example of the above embodiment, K1 equals 4.

[0157] As an example, the lower K1-1 bits of the K1 bit of the first field are provided by ssb-SubcarrierOffset, and the highest 1 bit of the K1 bit is provided by the PBCH; wherein, K1 is greater than 4.

[0158] As a sub-example of the above embodiment, K1 is equal to 5.

[0159] As an example, the broadcast information includes a cellBarred field, which indicates notBarred (not banned).

[0160] As an example, the first node performs cell selection and selects the first cell; wherein, the first node is in an RRC idle state.

[0161] As one example, the first node performs cell reselection and selects the first cell; wherein the first node is in an RRC idle state or an RRC inactive state.

[0162] As an example, the first cell is a suitable cell.

[0163] As an example, the first cell is an acceptable cell.

[0164] As one embodiment, the first node measures the cell quality of the first cell and selects the first cell; wherein the cell quality of the first cell satisfies cell selection or cell reselection criteria.

[0165] As an example, the first node selects the first cell based on the traditional intra-F / inter-F cell re-selection procedure, which is detailed in the 3GPP standard and will not be repeated here.

[0166] As an example, the first node sends a PRACH on the first cell after selecting the first cell.

[0167] As an example, the first node performs cell reselection after selecting the first cell.

[0168] As an example, whether the first node sends the PRACH or performs the cell reselection on the first cell depends on whether the target configuration is available on the first node.

[0169] As a sub-implementation of the above embodiments, the target configuration is the first configuration.

[0170] As a sub-implementation of the above embodiments, the target configuration is the second configuration.

[0171] As a sub-implementation of the above embodiments, the target configuration is the first configuration and the second configuration.

[0172] As an example, when the target configuration is available on the first node, the first node sends a PRACH.

[0173] As an example, the target configuration being available on the first node includes: at least one of the first configuration and the second configuration being available on the first node.

[0174] As an example, when the target configuration is unavailable on the first node, the first node performs cell reselection.

[0175] As one example, the target configuration being unavailable on the first node includes: both the first configuration and the second configuration being unavailable on the first node.

[0176] As an example, the first configuration is a high-level configuration.

[0177] As an example, the first configuration is an RRC (Radio Resource Control) configuration.

[0178] As an example, the first configuration is an uplink WUS (Wake Up Signal) configuration.

[0179] As an example, the first configuration includes at least a RACH (Random Access Channel) configuration.

[0180] As one example, the first configuration is received from the upper layer of the first node.

[0181] As an example, the upper layer of the first node is the RRC layer.

[0182] As an example, the upper layer of the first node is the NAS layer.

[0183] As an example, the first configuration is sent by the network to the UE via the air interface.

[0184] As an example, the first configuration is broadcast.

[0185] As an example, the first configuration is sent via unicast.

[0186] As an example, the first configuration indicates random access resources for on-demand SIB1 transmissions.

[0187] As an example, the first configuration indicates a request for frequency information for uplink transmission of the on-demand SIB1.

[0188] As one embodiment, the first configuration includes a first frequency information set.

[0189] As an example, the first frequency information set indicates the frequency information requesting the uplink transmission of the on-demand SIB1.

[0190] As an example, the first configuration includes a portion of FrequencyInfoUL (uplink frequency domain information) or FrequencyInfoUL-SIB (uplink frequency domain information in SIB).

[0191] As one embodiment, the first frequency information set includes a frequencyBandList.

[0192] As one embodiment, the first frequency information set includes absoluteFrequencyPointA.

[0193] As one embodiment, the first frequency information set includes offsetToCarrier (offset relative to the carrier).

[0194] As one embodiment, the first frequency information set includes p-Max (maximum power).

[0195] As one embodiment, the first frequency information set includes ULSubCarrierSpacing (uplink subcarrier spacing).

[0196] As an example, the first configuration includes rsrp-ThresholdSSB (SSB reference signal received power threshold).

[0197] As an example, the first configuration includes prach-RootSequenceIndex (PRACH root sequence index).

[0198] As an example, the first configuration includes msg1-SubcarrierSpacing.

[0199] As an example, the first configuration includes restrictedSetConfig.

[0200] As an example, the first configuration includes SIB1 request configuration.

[0201] As an example, the SIB1 request configuration is SIB1-RequestConfig (Information Element).

[0202] As an example, the SIB1 request configuration includes ss-PBCH-BlockPower (synchronization signal / physical broadcast channel block power).

[0203] As an example, the SIB1 request configuration includes SSB-positionInBurst (SSB position in a burst).

[0204] As an example, the SIB1 request configuration includes tdd-UL-DL-ConfigurationCommon (Time Division Duplex Uplink and Downlink Common Configuration).

[0205] As an example, the SIB1 request configuration includes sib1-RequestPeriod (SIB1 request period).

[0206] As an example, the SIB1 request configuration indicates a random access resource configuration for the SIB1 request.

[0207] As an example, the random access resource configuration for the SIB1 request includes Rach-OccasionsSIB1 (RACH timing for SIB1) IE.

[0208] As an example, the random access resource configuration for the SIB1 request includes the sib1-RequestResource (SIB1 Request Resource) IE.

[0209] As an example, the first configuration includes the random access resource configuration for the SIB1 request.

[0210] As an example, the random access resource configuration for the SIB1 request includes a portion of the fields in the RACH-ConfigGeneric IE.

[0211] As an example, the random access resource configuration for the SIB1 request includes a PRACH configuration index.

[0212] As an example, the random access resource configuration for the SIB1 request includes msg1-FDM (msg1 frequency division multiplexing), where msg1-FDM indicates the number of RA timings for frequency division multiplexing in a time instance.

[0213] As an example, the random access resource configuration for the SIB1 request includes msg1-FrequencyStart, which indicates the frequency offset of the lowest frequency RA relative to the first RB (Resource Block) determined by offsetToCarrier and absoluteFrequencyPointA in the frequency domain.

[0214] As an example, the random access resource configuration for the SIB1 request includes zeroCorrelationZoneConfig.

[0215] As an example, the random access resource configuration for the SIB1 request includes preambleReceivedTargetPower.

[0216] As an example, the random access resource configuration for the SIB1 request includes preambleTransMax (maximum number of preamble transmissions).

[0217] As one example, the random access resource configuration for the SIB1 request includes powerRampingStep.

[0218] As an example, the random access resource configuration for the SIB1 request includes a ra-ResponseWindow (random access response receiving window).

[0219] As an example, the random access resource configuration for the SIB1 request includes ssb-perRACH-Occasion (SSB for each RACH occasion).

[0220] As an example, the random access resource configuration for the SIB1 request includes ra-PreambleStartIndex (random access preamble start index).

[0221] As an example, the random access resource configuration for the SIB1 request includes ra-AssociationPeriodIndex (the association period index for RA).

[0222] As an example, the random access resource configuration for the SIB1 request includes ra-ssb-OccasionMaskIndex (a mask index between the SSB and the RA timing for the RA).

[0223] As an example, the random access resource configuration for the SIB1 request indicates the first random access resource.

[0224] As an example, the first random access resource is a dedicated random access resource.

[0225] As an example, the first random access resource is a SIB1-dedicated random access resource requested on demand.

[0226] As an example, the first random access resource is used at least to request the on-demand SIB1 transmission.

[0227] As an example, the first random access resource is used only to request the on-demand SIB1 transmission.

[0228] As one embodiment, the first random access resource includes at least one RACH opportunity that can be used to transmit the PRACH; wherein the at least one RACH opportunity overlaps with the frequency domain resources of the first cell in the frequency domain.

[0229] As one embodiment, the first random access resource includes at least one RACH opportunity that can be used to send the PRACH; wherein the at least one RACH opportunity overlaps with the frequency domain resources of the first cell in the frequency domain, and also overlaps with the frequency domain resources occupied by the SSB.

[0230] As an example, the second configuration is predefined.

[0231] As an example, the second configuration does not require the network to send it to the UE via the air interface.

[0232] As an example, the second configuration is obtained from the firmware of the first node.

[0233] As an example, the second configuration is an uplink WUS configuration.

[0234] As one embodiment, the second configuration indicates random access resources for on-demand SIB1 transmissions.

[0235] As an example, the second configuration indicates a request for frequency information of the uplink transmission of the on-demand SIB1.

[0236] As one embodiment, the second configuration includes the first frequency information set.

[0237] As one embodiment, the second configuration includes rsrp-ThresholdSSB (SSB reference signal received power threshold).

[0238] As an example, the second configuration includes prach-RootSequenceIndex (PRACH root sequence index).

[0239] As one embodiment, the second configuration includes msg1-SubcarrierSpacing.

[0240] As an example, the second configuration includes restrictedSetConfig.

[0241] As one embodiment, the second configuration includes the SIB1 request configuration.

[0242] As one embodiment, the second configuration includes the random access resource configuration for the SIB1 request.

[0243] As an example, the random access resource configuration for the SIB1 request indicates the second random access resource.

[0244] As an example, the second random access resource is a dedicated random access resource.

[0245] As one embodiment, the second random access resource is a SIB1-dedicated random access resource requested on demand.

[0246] As one embodiment, the second random access resource is used at least to request the on-demand SIB1 transmission.

[0247] As one embodiment, the second random access resource is used only to request the on-demand SIB1 transmission.

[0248] As an example, the first node transmits the PRACH on the first cell, and the PRACH occupies one of the first random access resources and the second random access resources.

[0249] As an example, the first node transmits the PRACH in the first random access resource on the first cell; wherein the first configuration is available on the first node.

[0250] As a sub-implementation of the above embodiments, the second configuration is available on the first node.

[0251] As a sub-implementation of the above embodiments, the second configuration is not available on the first node.

[0252] As one embodiment, the first node transmits the PRACH in the second random access resource on the first cell; wherein the first configuration is unavailable on the first node, and the second configuration is available on the first node.

[0253] As one embodiment, sending the PRACH includes: sending a signal on the PRACH.

[0254] As one embodiment, sending the PRACH includes: sending a random access preamble on the PRACH; wherein the random access preamble is indicated by the first random access resource or the second random access resource.

[0255] As one embodiment, sending the PRACH includes: sending a random access preamble at a RACH timing; wherein the RACH timing is indicated by the first random access resource or the second random access resource.

[0256] Example 2

[0257] Example 2 illustrates a network architecture diagram according to one embodiment of this application, as shown in Figure 2. Figure 2 illustrates a network architecture 200 of an NR 5G, LTE (Long-Term Evolution), and LTE-A (Long-Term Evolution Advanced) system. 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 can interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As shown, the 5GS / EPS provides packet-switched services; however, those skilled in the art will readily 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 Bs (gNBs) 203 and other gNBs 204. gNBs 203 provide user and control plane protocol termination toward the UE 201. gNBs 203 may connect to other gNBs 204 via Xn interfaces (e.g., backhaul links). The XnAP protocol of the Xn interface is used to transmit control plane messages for the wireless network, while the user plane protocol of the Xn interface is used to transmit user plane data. The gNB203 can 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 NTN (Non-Terrestrial Network) networks, the gNB203 can be a satellite, an aircraft, or a ground base station relayed via satellite. The gNB203 provides the UE201 with an access point to the 5GC / EPC210.Examples of UE201 include cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptops, 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 IoT devices, machine-type communication devices, land vehicles, automobiles, in-vehicle equipment, in-vehicle communication units, wearable devices, or any other similar functional devices. Those skilled in the art may also refer to UE201 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, handheld device, user agent, mobile client, client, or any other suitable term. gNB203 connects to 5GC / EPC210 via the S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF 213. MME / AMF / SMF 211 is the control node handling signaling between UE201 and 5GC / EPC210. ​​Generally, MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF 212, which is itself connected to P-GW / UPF 213. The P-GW provides UE IP address allocation and other functions. The P-GW / UPF213 connects to Internet service 230. Internet service 230 includes carrier-compliant Internet protocol services, specifically including Internet, intranet, IMS (IP Multimedia Subsystem), and PS (Packet Switching) streaming services.

[0258] As an example, UE201 corresponds to the first node in this application.

[0259] As an example, gNB203 corresponds to the second node in this application.

[0260] As an example, the UE201 is NES-aware.

[0261] As an example, the UE201 supports NES.

[0262] As an example, the gNB203 supports NES.

[0263] As an example, the gNB203 is a macrocell base station.

[0264] As an example, the gNB203 is a microcell base station.

[0265] As an example, the gNB203 is a pico cell base station.

[0266] As an example, the gNB203 is a femtocell.

[0267] As an example, the gNB203 is a base station device that supports large latency differences.

[0268] As one example, the gNB203 is a flight platform device.

[0269] As an example, the gNB203 is a satellite device.

[0270] As an example, the gNB203 is a base station device that supports large latency differences.

[0271] As one embodiment, the gNB203 is a test device (e.g., a transceiver device simulating part of the functions of a base station, a signaling tester).

[0272] As an example, the radio link from the UE201 to the gNB203 is an uplink, which is used to perform uplink transmissions.

[0273] As an example, the wireless link from the UE241 to the gNB203 is an uplink, which is used to perform uplink transmissions.

[0274] As an example, the radio link from the gNB203 to the UE201 is a downlink, which is used to perform downlink transmissions.

[0275] As an example, the radio link from the gNB203 to the UE241 is a downlink, which is used to perform downlink transmissions.

[0276] As an example, the UE201 and the gNB203 are connected via the Uu air interface.

[0277] As an example, the UE241 and the gNB203 are connected via the Uu air interface.

[0278] As an example, UE201 and UE241 are connected via a PC5 air interface.

[0279] Example 3

[0280] Example 3 illustrates a schematic diagram of the wireless protocol architecture for the user plane and control plane according to an embodiment of this application, as shown in Figure 3. Figure 3 is a schematic diagram illustrating an embodiment of the wireless protocol architecture for the user plane 350 and control plane 300. Figure 3 shows the wireless protocol architecture of the control plane 300 of the UE and gNB using three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (Physical Layer) signal processing functions. The L1 layer will be referred to herein as PHY 301. Layer 2 (L2 layer) 305 is above PHY 301 and is responsible for the link between the UE and gNB through PHY 301. L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the gNB on the network side. PDCP sublayer 304 provides data encryption and integrity protection, and also supports inter-gNB mobility for UEs. RLC sublayer 303 provides packet segmentation and reassembly, and implements retransmission of lost packets via ARQ (Automatic Repeat Request). RLC sublayer 303 also provides duplicate packet detection and protocol error detection. MAC sublayer 302 provides mapping between logical channels and transport channels, and multiplexing of logical channels. MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) within a cell among UEs. MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3) 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 wireless protocol architecture of user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer). The wireless protocol architecture in user plane 350 is largely the same as the corresponding layers and sublayers in control plane 300 for physical layer 351, PDCP sublayer 354 in L2 layer 355, RLC sublayer 353 in L2 layer 355 and MAC sublayer 352 in L2 layer 355. However, PDCP sublayer 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) sublayer 356. The SDAP sublayer 356 is responsible for mapping between QoS flows and data radio bearers to support service diversity. The radio protocol architecture of the UE in the user plane 350 at the L2 layer may include some or all of the protocol sublayers of the SDAP sublayer 356, PDCP sublayer 354, RLC sublayer 353, and MAC sublayer 352. Although not illustrated, the UE may also have several upper layers above the L2 layer 355, including a network layer (e.g., IP layer) terminating at the P-GW on the network side and an application layer terminating at the other end of the connection (e.g., a remote UE, server, etc.).

[0281] As an example, the PDCP304 sends data to or receives data from the RLC303 via the RLC channel.

[0282] As an example, the PDCP354 sends data to or receives data from the RLC353 via the RLC channel.

[0283] As an example, the RLC303 sends data to or receives data from the MAC302 via a logical channel.

[0284] As an example, the RLC353 sends data to or receives data from the MAC352 via a logical channel.

[0285] As one embodiment, the MAC302 sends data to or receives data from the PHY301 through the transmission channel.

[0286] As one embodiment, the MAC352 sends data to or receives data from the PHY351 via the transmission channel.

[0287] As an example, the wireless protocol architecture in Figure 3 is applicable to the first node in this application.

[0288] As an example, the wireless protocol architecture in Figure 3 is applicable to the second node in this application.

[0289] As an example, the SSB in this application is generated in the PHY301 or the PHY351.

[0290] As an example, the PRACH in this application is generated in the PHY301 or the PHY351.

[0291] As an example, the first configuration in this application is generated in the RRC306.

[0292] As an example, the first PDCCH in this application is generated in the PHY301 or the PHY351.

[0293] As an example, the second PDCCH in this application is generated in the PHY301 or the PHY351.

[0294] As an example, the on-demand SIB1 in this application is generated in the RRC306.

[0295] As an example, the L2 layer 305 or 355 belongs to a higher layer.

[0296] As an example, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

[0297] Example 4

[0298] Example 4 illustrates a hardware module schematic diagram of a communication device according to an embodiment of this application, as shown in Figure 4. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0299] 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.

[0300] The second communication device 410 includes a controller / processor 475, a memory 476, a data source 477, a receiver processor 470, a transmitter processor 416, a multi-antenna receiver processor 472, a multi-antenna transmitter processor 471, a transmitter / receiver 418, and an antenna 420.

[0301] 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 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 for the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmitting 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). Transmit processor 416 performs encoding and interleaving to facilitate FEC (Forward Error Correction) at the second communication device 410, and mapping of signal clusters based on various modulation schemes (e.g., BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), M-PSK (M-Phase Shift Keying), M-QAM (M-Quadrature Amplitude Modulation)). Multi-antenna transmit processor 471 performs digital spatial precoding on the encoded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, generating one or more spatial streams. Transmit processor 416 then maps each spatial stream to subcarriers, multiplexes it with a reference signal (e.g., a pilot) in the time and / or frequency domains, and subsequently uses IFFT (Inverse Fast Fourier Transform) to generate a physical channel carrying the time-domain multicarrier symbol stream. Multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multi-antenna transmitter processor 471 into an radio frequency stream, which is then provided to different antennas 420.

[0302] 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 a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the radio frequency carrier and converts the radio frequency stream into a baseband multicarrier symbol stream, which is then provided to the receiver processor 456. The receiver processor 456 and the multi-antenna receiver processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiver processor 458 performs receive analog precoding / beamforming operations on the baseband multicarrier symbol stream from the receiver 454. The receiver processor 456 uses FFT (Fast Fourier Transform) to convert the baseband multicarrier 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 receiver processor 456, where the reference signal is used for channel estimation, and the data signal is recovered in the multi-antenna receiver processor 458 after multi-antenna detection to recover any spatial stream destined for the first communication device 450. Symbols on each spatial stream are demodulated and recovered in the receive processor 456, generating soft decisions. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper-layer data and control signals transmitted by the second communication device 410 over the physical channel. The upper-layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of Layer 2. The controller / processor 459 may be associated with a memory 460 storing program code and data. The memory 460 may be referred to as computer-readable media. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides multiplexing, packet reassembly, decryption, header decompression, and control signal processing between the transport and logical channels to recover higher-layer data packets from the second communication device 410. The upper-layer data packets are then provided to all protocol layers above Layer 2. Various control signals may also be provided to Layer 3 for Layer 3 processing.

[0303] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, upper-layer data packets are provided to the controller / processor 459 using a data source 467. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission functions at the second communication device 410 described 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 the logical and transport channels, implementing L2 layer functions for the user plane and control plane. The controller / processor 459 is also responsible for retransmitting lost packets and signaling to the second communication device 410. Transmit processor 468 performs modulation mapping and channel coding processing, while multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming processing. Subsequently, transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding / beamforming operations in multi-antenna transmit processor 457, the stream is provided to different antennas 452 via transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by multi-antenna transmit processor 457 into a radio frequency symbol stream before providing it to antenna 452.

[0304] 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 receiving function at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives radio frequency signals through its corresponding antenna 420, converts the received radio frequency signals into baseband signals, and provides the baseband signals to the multi-antenna receiving processor 472 and the receiving processor 470. The receiving processor 470 and the multi-antenna receiving processor 472 jointly implement the L1 layer function. The controller / processor 475 implements the L2 layer function. The controller / processor 475 may be associated with a memory 476 storing program code and data. The memory 476 may be referred to as computer-readable media. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between the transmission and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper-layer data packets from the first communication device 450. Upper-layer data packets from the controller / processor 475 can be provided to the core network or all protocol layers above the L2 layer, and various control signals can also be provided to the core network or L3 for L3 processing.

[0305] As one embodiment, 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 at least: receives an SSB in a first cell and selects the first cell, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; transmits a PRACH on the first cell, or performs cell reselection; wherein whether the first node transmits the PRACH or performs cell reselection on the first cell depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, the first configuration being associated with the first cell; the second configuration indicates a second random access resource, the second configuration being not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0306] As one embodiment, the first communication device 450 includes: a memory storing a computer-readable instruction program that, when executed by at least one processor, produces actions including: receiving an SSB in a first cell and selecting the first cell, the SSB indicating that only on-demand SIB1 should be transmitted in the first cell; transmitting a PRACH on the first cell, or performing a cell reselection; wherein whether the first node transmits the PRACH on the first cell or performs the cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0307] As one embodiment, 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 at least: transmits an SSB in a first cell, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; wherein the first cell is selected; a first node transmits a PRACH on the first cell, or performs cell reselection; whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, the first configuration being associated with the first cell; the second configuration indicates a second random access resource, the second configuration being not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0308] As one embodiment, the second communication device 410 includes: a memory storing a computer-readable instruction program that, when executed by at least one processor, produces actions including: transmitting an SSB in a first cell, the SSB indicating that only on-demand SIB1s are transmitted in the first cell; wherein the first cell is selected; a first node transmitting a PRACH on the first cell, or performing a cell reselection; whether the first node transmits the PRACH on the first cell or performs the cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0309] As an example, the first communication device 450 corresponds to the first node in this application.

[0310] As an example, the second communication device 410 corresponds to the second node in this application.

[0311] As an example, the first communication device 450 is a user equipment.

[0312] As an example, the first communication device 450 is a Layer 3 relay node.

[0313] As an example, the first communication device 450 is an RSU (Road Side Unit).

[0314] As one embodiment, the second communication device 410 is a base station.

[0315] As one embodiment, the second communication device 410 is a base station distribution unit.

[0316] As one embodiment, the second communication device 410 is a piece of code in the distribution unit of a base station.

[0317] As one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiving processor 458, the receiving processor 456, or the controller / processor 459 is used to receive the SSB in this application.

[0318] As one embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmitter processor 471, the transmitter processor 416, or the controller / processor 475 is used to transmit the SSB in this application.

[0319] As one embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmitter processor 457, the transmitter processor 468, or the controller / processor 459 is used to transmit the PRACH in this application.

[0320] As one embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna receiver processor 472, the receiver processor 470, or the controller / processor 475 is used to receive PRACH in this application.

[0321] As one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiving processor 458, the receiving processor 456, or the controller / processor 459 is used to receive the first configuration in this application.

[0322] As one embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmitter processor 471, the transmitter processor 416, or the controller / processor 475 is used to transmit the first configuration in this application.

[0323] As one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiver processor 458, the receiver processor 456, or the controller / processor 459 is used to receive the first PDCCH in this application.

[0324] As an example, at least one of the antenna 420, the transmitter 418, the multi-antenna transmitter processor 471, the transmitter processor 416, or the controller / processor 475 is used to transmit the first PDCCH in this application.

[0325] As one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiver processor 458, the receiver processor 456, or the controller / processor 459 is used to receive the second PDCCH in this application.

[0326] As an example, at least one of the antenna 420, the transmitter 418, the multi-antenna transmitter processor 471, the transmitter processor 416, or the controller / processor 475 is used to transmit the second PDCCH in this application.

[0327] As one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiving processor 458, the receiving processor 456, or the controller / processor 459 is used to receive the on-demand SIB1 in this application.

[0328] As one embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmitter processor 471, the transmitter processor 416, or the controller / processor 475 is used to transmit the on-demand SIB1 in this application.

[0329] Example 5

[0330] Example 5 illustrates a signal processing flowchart in a first node according to an embodiment of this application, as shown in Figure 5.

[0331] In Example 5, for the first node N500, in step S501, an SSB is received in the first cell and the first cell is selected; in step S502, it is determined whether the first configuration is available on the first node. If yes, step S503 is executed; if no, step S504 is executed; in step S503, the PRACH is sent in the first random access resource indicated by the first configuration; in step S504, it is determined whether the second configuration is available on the first node. If yes, step S505 is executed; if no, step S506 is executed; in step S505, the PRACH is sent in the second random access resource indicated by the second configuration; in step S506, cell reselection is performed.

[0332] As an example, in step S502, the first node determines whether the first configuration is available in the first cell.

[0333] As an example, the first configuration is available on the first node; wherein the first node maintains the first configuration.

[0334] As one embodiment, the first configuration available at the first node includes receiving the first configuration before selecting the first cell.

[0335] As an example, the first configuration is not available on the first node; wherein the first node does not maintain the first configuration.

[0336] As one example, the first configuration being unavailable at the first node includes: not receiving the first configuration before selecting the first cell.

[0337] As an example, in step S504, the first node determines whether the second configuration is available in the first cell.

[0338] As one embodiment, the second configuration is available on the first node; wherein the first node maintains the second configuration.

[0339] As one example, the second configuration is not available on the first node; wherein the first node does not maintain the second configuration.

[0340] As an example, the PRACH is transmitted on the first cell; wherein at least one of the first configuration and the second configuration is available on the first node.

[0341] As an example, when at least the first configuration and the second configuration are available on the first node, the first node sends the PRACH in the first random access resource indicated by the first configuration.

[0342] As an example, when the first configuration is available on the first node, regardless of whether the second configuration is available on the first node, the first node sends the PRACH in the first random access resource indicated by the first configuration.

[0343] As a sub-implementation of the two embodiments described above, the first node only maintains the first configuration.

[0344] As a sub-implementation of the two embodiments described above, the first node maintains both the first configuration and the second configuration.

[0345] As an example, when the first configuration is unavailable on the first node, whether the first node sends the PRACH or performs the cell reselection on the first cell depends on whether the second configuration is available on the first node.

[0346] As an example, when the first configuration is unavailable on the first node and the second configuration is available on the first node, the first node sends the PRACH in the second random access resource indicated by the second configuration.

[0347] As a sub-implementation of the above embodiments, the first node only maintains the second configuration.

[0348] As an example, when the first configuration is unavailable on the first node and the second configuration is unavailable on the first node, the first node performs the cell reselection.

[0349] Example 6

[0350] Example 6 illustrates a wireless signal transmission flowchart between a first node and a second node according to an embodiment of this application, as shown in Figure 6. In Figure 6, the first node N61, the second node N62, and the third node N63 communicate via an air interface. It should be noted that the order in this example does not limit the signal transmission order or the order of implementation in this application.

[0351] For the first node N61, in step S611, a first configuration is received from the second cell; in step S612, an SSB is received in the first cell and the first cell is selected; in step S613, a PRACH is sent in the first random access resource indicated by the first configuration.

[0352] For the second node N62, in step S621, an SSB is sent in the first cell.

[0353] For the third node N63, in step S631, the first configuration is sent in the second cell.

[0354] In Example 6, an SSB is received in a first cell and the first cell is selected, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; a PRACH is transmitted on the first cell, or cell reselection is performed; wherein, whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, and the first configuration is associated with the first cell; the second configuration indicates a second random access resource, and the second configuration is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource; the first configuration is available on the first node, and the PRACH is transmitted in the first random access resource indicated by the first configuration; wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration simultaneously; the first configuration is received from a second cell, the first configuration being associated with at least the first cell; wherein, the second cell and the first cell are two different cells.

[0355] Example 6 applies to scenarios where the first configuration is available on the first node.

[0356] As one embodiment, the first node N61 and the second node N62 transmit through at least the first cell.

[0357] As an example, the first node N61 and the third node N63 transmit through at least the second cell.

[0358] As an example, the first node N61 is a UE.

[0359] As an example, the first node N61 is a terminal.

[0360] As an example, the first node N61 is the first node in this application.

[0361] As one example, the second node N62 is the sustaining base station of the first cell.

[0362] As an example, the second node N62 is the second node in this application.

[0363] As an example, the third node N63 is the sustaining base station of the second cell.

[0364] As an example, the third node N63 belongs to the second node in this application.

[0365] In one embodiment, the second node N62 and the third node N63 are two different nodes.

[0366] As a sub-implementation of the above embodiments, the first cell and the second cell belong to different gNB-DU (Distributed Unit).

[0367] As a sub-implementation of the above embodiments, the different gNB-DUs belong to the same gNB-CU (Central Unit).

[0368] As a sub-implementation of the above embodiments, the different gNB-DUs belong to different gNB-CUs.

[0369] As a sub-implementation of the above embodiment, the second node N62 and the third node N63 are not co-located.

[0370] As a sub-example of the above embodiment, the second node N62 and the third node N63 belong to different transceiver points.

[0371] As a sub-example of the above embodiment, the second node N62 and the third node N63 belong to different base stations.

[0372] In one embodiment, the second node N62 and the third node N63 belong to the same node.

[0373] As a sub-example of the above embodiments, the first cell and the second cell belong to the same gNB-DU.

[0374] As a sub-implementation of the above embodiment, the second node N62 and the third node N63 are co-located.

[0375] As a sub-example of the above embodiment, the second node N62 and the third node N63 belong to the same Transmit / Receive Point (TRP).

[0376] As a sub-example of the above embodiment, the second node N62 and the third node N63 belong to the same base station.

[0377] As an example, the third node N63 transmits the first configuration in the second cell.

[0378] As an example, the SSB in the first cell is received via the air interface.

[0379] As an example, the first configuration is received in the second cell via the air interface.

[0380] As an example, the air interface is a Uu interface.

[0381] As an example, the first cell and the second cell are two different cells.

[0382] As an example, the first cell and the second cell are adjacent cells.

[0383] As an example, the second cell is the serving cell before the first node enters the RRC idle state or the RRC inactive state.

[0384] As one embodiment, a first signaling is received from the second cell, the first signaling including the first configuration.

[0385] As an example, the first signaling is initiated by the network.

[0386] As an example, the first signaling is requested by the UE.

[0387] As an example, the first signaling is an RRC message.

[0388] As one embodiment, the first signaling is a system information block.

[0389] As an example, the system information block is SIBx; where x is a positive integer greater than 25.

[0390] As one embodiment, the system information block includes the first configuration.

[0391] As an example, the system information block is used by the network to issue uplink WUS configurations for on-demand SIB1 requests.

[0392] As an example, after receiving the first configuration from the second cell, the first configuration is maintained.

[0393] As one example, the maintenance includes storage.

[0394] As a sub-implementation of the above embodiments, at least the first configuration and the second configuration are maintained.

[0395] As one embodiment, the first configuration is received from the second cell, an SSB is received in the first cell and the first cell is selected, and the PRACH is transmitted on the first random access resource indicated by the first configuration on the first cell.

[0396] Example 7

[0397] Example 7 illustrates a schematic diagram of the overlap between the first frequency domain resources and the frequency domain resources of the first cell according to an embodiment of this application, as shown in Figure 7. In Figure 7, the rectangle filled with left diagonal lines represents the four RACH occasions included in a time instance in the time domain in the second random access resource; furthermore, the length of the rectangle in the frequency domain does not represent the absolute bandwidth.

[0398] In embodiment 7, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH.

[0399] As one embodiment, the first frequency domain resource includes a plurality of resource blocks (RBs) that are consecutive in the frequency domain.

[0400] As an example, the frequency domain resources of the first cell include multiple resource blocks that are consecutive in the frequency domain.

[0401] As an example, the frequency domain resources of the first cell are common resource blocks (CRBs).

[0402] As an example, the frequency domain resources of the first cell are an overall resource block grid.

[0403] As one embodiment, the overlap between the first frequency domain resources and the frequency domain resources of the first cell includes: the frequency domain resources of the first cell include the first frequency domain resources.

[0404] As one embodiment, the overlap between the first frequency domain resource and the frequency domain resource of the first cell includes: the first frequency domain resource is a subset of the frequency domain resource of the first cell.

[0405] As an example, the overlap between the first frequency domain resource and the frequency domain resource of the first cell includes: the first frequency domain resource is a proper subset of the frequency domain resource of the first cell.

[0406] As an example, the first frequency domain resource is the frequency domain resource occupied by at least one RACH timing included in the second random access resource and overlapping with the frequency domain resource of the first cell.

[0407] As an example, as shown in Figure 7, the second random access resource includes at least one RACH opportunity that can be used to transmit the PRACH; wherein the at least one RACH opportunity overlaps with the frequency domain resources of the first cell in the frequency domain.

[0408] As a sub-implementation of the above embodiments, the at least one RACH timing is a subset of the frequency domain resources of the first cell in the frequency domain.

[0409] As a sub-implementation of the above embodiments, the at least one RACH timing includes a RACH timing that overlaps with the frequency domain resource portion of the first cell in the frequency domain.

[0410] As an example, although not shown in Figure 7, the second random access resource includes a second frequency domain resource, which is orthogonal to the frequency domain resource of the first cell.

[0411] As one embodiment, the second random access resource includes at least one RACH timing that cannot be used to transmit the PRACH; wherein the at least one RACH timing is orthogonal to the frequency domain resources of the first cell in the frequency domain.

[0412] Example 8

[0413] Example 8 illustrates a schematic diagram of the overlap between the first frequency domain resource and the frequency domain resource occupied by the SSB according to an embodiment of this application, as shown in Figure 8. In Figure 8, the rectangle filled with left-hand diagonal lines represents the four RACH opportunities included in a time instance in the time domain of the second random access resource; the rectangle filled with diamond grids represents the frequency domain resource occupied by the SSB; furthermore, the length of the rectangle in the frequency domain does not represent the absolute bandwidth.

[0414] In embodiment 8, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH; the frequency domain resource occupied by the SSB overlaps with the first frequency domain resource.

[0415] As an example, the frequency domain resources of the first cell include the frequency domain resources occupied by the SSB.

[0416] As an example, the frequency domain resources occupied by the SSB are a subset of the frequency domain resources of the first cell.

[0417] As an example, the frequency domain resources occupied by the SSB are a portion of the frequency domain resources of the first cell.

[0418] As one embodiment, the overlap between the frequency domain resources occupied by the SSB and the first frequency domain resources includes: the frequency domain resources occupied by the SSB include the first frequency domain resources.

[0419] As one embodiment, the overlap between the frequency domain resources occupied by the SSB and the first frequency domain resources includes: the first frequency domain resources being a subset of the frequency domain resources occupied by the SSB.

[0420] As an example, the overlap between the frequency domain resources occupied by the SSB and the first frequency domain resources includes: the first frequency domain resources being a proper subset of the frequency domain resources occupied by the SSB.

[0421] As an example, the first frequency domain resource is the frequency domain resource occupied by at least one RACH timing that overlaps with the frequency domain resource occupied by the SSB, which is included in the second random access resource.

[0422] As an example, the first frequency domain resource includes a RACH timing that partially overlaps with the frequency domain resource occupied by the SSB in the frequency domain.

[0423] As an example, the RACH timing that overlaps with the frequency domain resources occupied by the SSB in the frequency domain can be used to transmit the PRACH.

[0424] As an example, RACH timings that overlap with the frequency domain resources occupied by the SSB in the frequency domain cannot be used to transmit the PRACH.

[0425] As an example, as shown in Figure 8, the second random access resource includes at least one RACH opportunity that can be used to send the PRACH; wherein the at least one RACH opportunity overlaps with the frequency domain resources of the first cell in the frequency domain and with the frequency domain resources occupied by the SSB.

[0426] As an example, as shown in Figure 8, the second random access resource includes at least one RACH opportunity that cannot be used to send the PRACH; wherein, the at least one RACH opportunity overlaps with the frequency domain resources of the first cell in the frequency domain, but does not overlap with the frequency domain resources occupied by the SSB.

[0427] Example 9

[0428] Example 9 illustrates a timing relationship diagram for monitoring a first PDCCH according to an embodiment of this application, as shown in Figure 9.

[0429] In Embodiment 9, a first timer is started after a first time interval following the completion of the PRACH transmission; while the first timer is running, a first PDCCH is monitored; wherein, the first time interval includes Q1 symbols, and Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving random access responses.

[0430] As an example, the PRACH transmission end includes: the transmission end of a random access preamble.

[0431] As an example, the PRACH transmission end includes: the transmission end of the last transmission of all repetitions of a random access preamble; wherein, the PRACH includes repetitions.

[0432] As an example, the first timer is started on the first PDCCH occasion after the PRACH transmission ends.

[0433] As an example, the first timer is started after the PRACH transmission ends and the first time interval has elapsed; wherein, the first time interval includes Q1 symbols, and Q1 is a non-negative integer.

[0434] As an example, Q1 is predefined.

[0435] As an example, Q1 is fixed.

[0436] As an example, the first timer is a ra-ResponseWindow (random access response window).

[0437] As an example, the expiration value of the first timer is indicated by the first configuration.

[0438] As an example, the expiration value of the first timer is indicated by the second configuration.

[0439] As one embodiment, monitoring the first PDCCH includes: monitoring the signal on the first PDCCH.

[0440] As an example, monitoring the first PDCCH includes: blind decoding of the DCI (Downlink Control Information) carried by the first PDCCH.

[0441] As an example, the first PDCCH is addressed to RA-RNTI (Radio Network Temporary Identifier).

[0442] As an example, the CRC (Cyclic Redundancy Check) of the transport block (TB) generated by the random access response is scrambled by the RA-RNTI.

[0443] As an example, the first PDCCH is monitored during the first monitoring occasions.

[0444] As an example, the first monitoring timing is indicated by the first configuration; wherein the PRACH is sent in the first random access resource indicated by the first configuration.

[0445] As an example, the first monitoring timing is indicated by the second configuration; wherein the PRACH is sent in the second random access resource indicated by the second configuration.

[0446] As one embodiment, the first configuration includes a first information block, which indicates the first monitoring timing.

[0447] As an example, the random access resource configuration for the SIB1 request includes the first information block.

[0448] As an example, the first information block is pdcch-ConfigOD-SIB1-RAR (PDCCH configuration for random access response of SIB1 on demand).

[0449] As one embodiment, the first information block indicates a control resource set.

[0450] As one example, the first information block indicates the monitoring slot period and offset.

[0451] As one example, the first information block indicates the duration.

[0452] As one example, the first information block indicates the monitoring symbols within a slot.

[0453] As an example, the first information block indicates an aggregation level.

[0454] As one embodiment, the second configuration includes the first information block.

[0455] As one example, the broadcast information includes a PDCCH configuration for SIB1.

[0456] As an example, the broadcast information indicates the first monitoring timing.

[0457] As an example, the searchSpaceZero field and the controlResourceSetZero field indicate the first monitoring timing.

[0458] As an example, the searchSpaceZero domain and the controlResourceSetZero domain are located in PDCCH-ConfigSIB1 (PDCCH configuration for SIB1) IE.

[0459] As an example, the broadcast information includes the searchSpaceZero field and the controlResourceSetZero field.

[0460] As an example, if the first PDCCH is not received when the first counter expires, the value of the first counter is incremented by one.

[0461] As an example, the first counter is PREAMBLE_TRANSMISSION_COUNTER.

[0462] As an example, the initial value of the first counter is 1.

[0463] As an example, when initiating a random access procedure to request the on-demand SIB1, the first timer is set to the initial value.

[0464] As an example, when the value of the first counter is less than the first threshold, the PRACH is sent again; for details, please refer to the 3GPP standard, which will not be repeated here.

[0465] As an example, when the value of the first counter is equal to the first threshold, it is considered that the random access initiated to request the on-demand SIB1 has failed.

[0466] As an example, the first threshold is 1 + preambleTransMax (preamble maximum value).

[0467] As an example, the preambleTransMax is indicated by the first configuration.

[0468] As an example, the preambleTransMax is indicated by the second configuration.

[0469] As an example, the MAC entity of the first node indicates to the upper layer that the RACH has failed.

[0470] As an example, the first node considers the on-demand SIB1 request in the first cell to have failed after the RACH failure occurs.

[0471] As an example, the first node considers the first cell to be barred after the RACH failure occurs.

[0472] As an example, the first node performs cell reselection after the RACH failure occurs.

[0473] As an example, the first PDCCH is received before the first timer expires; wherein the first counter is less than the first threshold.

[0474] As an example, the first PDCCH indicates the scheduling information for receiving the random access response.

[0475] As an example, the first PDCCH includes a valid downlink allocation, and the downlink allocation included in the second PDCCH indicates the time-frequency resources for transmitting the random access response.

[0476] As an example, the random access response is received in the downlink allocation included in the first PDCCH.

[0477] Example 10

[0478] Example 10 illustrates a schematic diagram of a timing relationship for monitoring a second PDCCH according to an embodiment of this application, as shown in Figure 10.

[0479] In Example 10, a second timer is started after a second time interval following a first reference time; while the second timer is running, a second PDCCH is monitored; wherein, the first reference time is associated with sending the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the reception of the on-demand SIB1 scheduling information.

[0480] As one embodiment, the association of the first reference time with the transmission of the PRACH includes: the first reference time is the end time of the transmission of the PRACH.

[0481] As a sub-implementation of the above embodiment, Q2 is an integer greater than 0.

[0482] As a sub-implementation of the above embodiments, when the PRACH includes repeated transmissions, the first reference time is the end time of the last transmission included in the repeated transmissions.

[0483] As one embodiment, the association of the first reference time with sending the PRACH includes: the first reference time is the expiration time of the first timer.

[0484] As a sub-implementation of the above embodiment, Q2 is 0 or an integer greater than 0.

[0485] As one embodiment, the first reference time associated with sending the PRACH includes: the first reference time is the end of reception time of the first PDCCH.

[0486] As a sub-implementation of the above embodiment, Q2 is an integer greater than 0.

[0487] As one embodiment, the association of the first reference time with sending the PRACH includes: the first reference time being the end time of receiving the random access response.

[0488] As a sub-implementation of the above embodiment, Q2 is an integer greater than 0.

[0489] As one embodiment, the second timer is the receiving window of the on-demand SIB1.

[0490] As one embodiment, the start time of the second timer is the first reference time plus the second time interval.

[0491] As an example, the first configuration indicates that the start time and duration of the second PDCCH are monitored.

[0492] As an example, the first configuration indicates at least the latter of the start time and the expiration time of the second timer.

[0493] As a sub-example of the above embodiment, the PRACH is transmitted in the first random access resource indicated by the first configuration.

[0494] As an example, the second configuration instructs the monitoring of the start time and duration of the second PDCCH.

[0495] As one embodiment, the second configuration indicates at least the latter of the start time and the expiration time of the second timer.

[0496] As a sub-example of the above embodiment, the PRACH is transmitted in the second random access resource indicated by the second configuration.

[0497] As an example, the random access response is received, the random access response indicating the start time and duration of monitoring the second PDCCH.

[0498] As an example, the random access response indicates the start and expiration times of the second timer.

[0499] As one embodiment, monitoring the second PDCCH includes: monitoring the signal on the second PDCCH.

[0500] As an example, monitoring the second PDCCH includes blind decoding of the DCI carried by the second PDCCH.

[0501] As an example, the second PDCCH is addressed to SI (System Information) - RNTI.

[0502] As an example, the first configuration includes the PDCCH configuration for SIB1.

[0503] As an example, the second configuration includes the PDCCH configuration for SIB1.

[0504] As an example, the second PDCCH is monitored at a second monitoring time.

[0505] As an example, the second monitoring timing is indicated by the searchSpaceZero field and the controlResourceSetZero field.

[0506] As one embodiment, the first configuration includes the searchSpaceZero domain and the controlResourceSetZero domain; wherein the PRACH is sent in the first random access resource indicated by the first configuration.

[0507] As one embodiment, the second configuration includes the searchSpaceZero field and the controlResourceSetZero field; wherein the PRACH is sent in the first random access resource indicated by the second configuration.

[0508] As a sub-example of the two embodiments described above, the SSB in the first cell is located on the synchronization grid.

[0509] As a sub-implementation of the above two embodiments, the decimal value of K_SSB is a positive integer greater than 11 and less than 14; wherein, the frequency band where the first cell is located belongs to FR1.

[0510] As a sub-implementation of the above two embodiments, the decimal value of K_SSB is a positive integer greater than 23 and less than 30; wherein, the frequency band in which the first cell is located belongs to FR2.

[0511] As an example, the first field indicates the K_SSB.

[0512] As an example, the SSB includes at least the former of sub-SubcarrierOffset and PBCH, which indicates the K_SSB.

[0513] As one embodiment, the broadcast information indicates the second monitoring timing; wherein, the broadcast information includes the searchSpaceZero field and the controlResourceSetZero field.

[0514] As a sub-example of the above embodiment, the decimal value of K_SSB is 14.

[0515] As a sub-example of the above embodiment, the decimal value of K_SSB is 30.

[0516] As an example, the second PDCCH indicates at least one transmission of the on-demand SIB1.

[0517] As an example, the second PDCCH indicates only one transmission of the on-demand SIB1.

[0518] As an example, the second PDCCH indicates multiple transmissions of the on-demand SIB1.

[0519] As a sub-implementation of the above embodiment, the multiple transmissions of the on-demand SIB1 are periodic; wherein, the second PDCCH indicates the start time, period, and duration of the multiple transmissions of the on-demand SIB1.

[0520] As an example, the second PDCCH indicates the receipt of the on-demand SIB1 scheduling information.

[0521] As one embodiment, the second PDCCH includes a valid downlink allocation, the downlink allocation of the second PDCCH indicating the time-frequency resources for transmitting the on-demand SIB1.

[0522] As an example, the on-demand SIB1 is received in the downlink allocation included in the first PDCCH.

[0523] Example 11

[0524] Example 11 illustrates another wireless signal transmission flowchart between a first node and a second node according to an embodiment of this application, as shown in Figure 11. In Figure 11, the first node N111 and the second node N112 communicate via an air interface. It should be noted that the order in this example does not limit the signal transmission order or the order of implementation in this application.

[0525] For the first node N111, in step S1111, it sends PRACH; in step S1112, it receives a random access response; in step S1113, it receives an on-demand SIB1; and in step S1114, it camps in the first cell.

[0526] For the second node N112, in step S1121, it receives PRACH; in step S1122, it sends a random access response; and in step S1123, it sends an on-demand SIB1.

[0527] In Embodiment 11, a first timer is started after a first time interval following the completion of the PRACH transmission; while the first timer is running, a first PDCCH is monitored; wherein, the first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates scheduling information for receiving a random access response; a second timer is started after a second time interval following a first reference time; while the second timer is running, a second PDCCH is monitored; wherein, the first reference time is associated with the transmission of the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates scheduling information for receiving the on-demand SIB1; and as a response to receiving the on-demand SIB1, the device camps on the first cell.

[0528] Example 11 applies to a scenario where the first node successfully receives on-demand SIB1 in the first cell based on a random access procedure.

[0529] Example 11 applies to the scenario where the first node is stationed in the first cell.

[0530] As an example, the first node N111 is a UE.

[0531] As an example, the first node N111 is a terminal.

[0532] As an example, the first node N111 is the first node in this application.

[0533] As one example, the second node N112 is the sustaining base station of the first cell.

[0534] As an example, the second node N112 is the second node in this application.

[0535] As one embodiment, the first node N111 and the second node N112 transmit through at least the first cell.

[0536] As an example, the first node initiates a random access procedure in the first cell for an on-demand SIB1 request.

[0537] As an example, the PRACH is transmitted on the first cell; after the PRACH transmission ends, the first timer is started after the first time interval.

[0538] As an example, the random access response is received on the first cell; wherein, during the operation of the first timer, the first PDCCH is received on the first cell.

[0539] As an example, receiving the random access response includes: receiving a first PDSCH (Physical Downlink Shared Channel), the first PDSCH carrying a MAC PDU (Protocol Data Unit), the MAC PDU including at least one MAC subPDU, and one of the at least one MAC subPDU including the random access response.

[0540] As an example, the MAC subheader corresponding to the random access response includes at least a random access preamble identifier (RAPID); wherein the random access preamble identifier indicates the random access preamble sent on the PRACH.

[0541] As one embodiment, receiving the first PDSCH includes: receiving a signal transmitted on the first PDSCH.

[0542] As an example, receiving the first PDSCH includes: decoding the TB (transport block) carried by the first PDSCH.

[0543] As an example, the random access response implicitly indicates that the network has received the request for the on-demand SIB1.

[0544] As an example, the on-demand SIB1 is received on the first cell; wherein, the second timer is started after the second time interval following the first reference time; while the second timer is running, the second PDCCH is received on the first cell, the second PDCCH indicating the reception of the scheduling information of the on-demand SIB1.

[0545] As an example, the second PDCCH schedules the on-demand SIB1 transmission.

[0546] As an example, the second PDCCH schedules the second PDSCH, which carries the on-demand SIB1.

[0547] As one embodiment, receiving the on-demand SIB1 includes: receiving the second PDSCH.

[0548] As one embodiment, receiving the on-demand SIB1 includes: receiving the on-demand SIB1 on the time-frequency resources of the second PDSCH.

[0549] As one embodiment, receiving the second PDSCH includes: receiving a signal transmitted on the first PDSCH.

[0550] As one embodiment, receiving the second PDSCH includes: decoding the TB carried by the first PDSCH.

[0551] As one embodiment, the second PDCCH indicates at least one PDSCH, which carries the on-demand SIB1 respectively; wherein the on-demand SIB1 is repeatedly transmitted.

[0552] As an example, the advantage of the above method is that it can improve the transmission robustness of the on-demand SIB1.

[0553] As an example, the at least one PDSCH includes the second PDSCH.

[0554] As an example, a PDSCH carrying the on-demand SIB1 includes: the PDSCH carrying a MAC PDU, wherein the MAC PDU includes the on-demand SIB1.

[0555] As an example, a PDSCH carrying the on-demand SIB1 includes: the PDSCH carrying a MAC PDU, the MAC PDU including at least one MAC subPDU, and one of the at least one MAC subPDU including the on-demand SIB1.

[0556] As an example, in response to receiving the on-demand SIB1, the first node camps on the first cell.

[0557] As an example, in response to receiving the on-demand SIB1, the first node stores the obtained SIB1.

[0558] As an example, the first node sends the PRACH to request SIB1 of the first cell.

[0559] As an example, requesting SIB1 of the first cell is for the purpose of camping on the first cell.

[0560] As an example, the request for SIB1 of the first cell is to establish an RRC connection with the first cell through a random access procedure.

[0561] As a sub-example of the above embodiment, establishing an RRC connection with the first cell includes: resuming the RRC connection with the first cell.

[0562] Example 12

[0563] Example 12 illustrates another signal processing flowchart in a first node according to an embodiment of this application, as shown in Figure 12.

[0564] In Example 12, the first node 1200 performs cell reselection in step 1201 when the second timer expires and the on-demand SIB1 is not received; in step 1202, as a response to the second timer expiring and the on-demand SIB1 not being received.

[0565] As an example, when the on-demand SIB1 is not successfully received, cell reselection within the frequency is performed.

[0566] As a sub-implementation of the above embodiment, the broadcast information includes an intraFreqReselection field, the value of which is allowed.

[0567] As an example, if the on-demand SIB1 is not successfully received, the first cell is considered to be barred.

[0568] As an example, when the on-demand SIB1 is not successfully received, the first cell is disabled (bar(s)).

[0569] As an example, the failure to successfully receive the on-demand SIB1 includes: the second timer expiring and the second PDCCH not being received.

[0570] As one embodiment, the failure to successfully receive the on-demand SIB1 includes: the second timer expires and the on-demand SIB1 is not received.

[0571] As an example, the expiration value of the second timer is configured.

[0572] As an example, the expiration value of the second timer is indicated by the first configuration.

[0573] As an example, the expiration value of the second timer is indicated by the second configuration.

[0574] As an example, the second timer is stopped when the second PDCCH is received.

[0575] As an example, the second timer is stopped upon receiving the on-demand SIB1.

[0576] Example 13

[0577] Example 13 illustrates a structural block diagram of a processing apparatus in a first node according to an embodiment of the present application, as shown in Figure 13.

[0578] In Figure 13, the first node processing device 1300 includes a first receiver 1301 and a first transmitter 1302; the first node 1300 is a terminal, or the first node 1100 is a UE.

[0579] In embodiment 13, the first receiver 1301 receives an SSB in a first cell and selects the first cell, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; the first transmitter 1302 transmits a PRACH on the first cell, or the first receiver 1301 performs cell reselection; wherein, whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, and the first configuration is associated with the first cell; the second configuration indicates a second random access resource, and the second configuration is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0580] As one embodiment, the first configuration is available on the first node, and the first transmitter 1302 transmits the PRACH in the first random access resource indicated by the first configuration; wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

[0581] As one embodiment, the second configuration is available on the first node, and the first transmitter 1302 transmits the PRACH in the second random access resource indicated by the second configuration; wherein the first node only maintains the second configuration.

[0582] As an example, if neither the first configuration nor the second configuration is available at the first node, the first receiver 1301 performs cell reselection.

[0583] As one embodiment, the first receiver 1301 receives the first configuration from a second cell, the first configuration being associated with at least the first cell; wherein the second cell and the first cell are two different cells.

[0584] As one embodiment, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH.

[0585] As one embodiment, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH; the frequency domain resource occupied by the SSB overlaps with the first frequency domain resource.

[0586] As an example, the first receiver 1301 starts a first timer after a first time interval following the end of the PRACH transmission; while the first timer is running, it monitors a first PDCCH; wherein the first time interval includes Q1 symbols, and Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving a random access response.

[0587] As one embodiment, the first receiver 1301 starts a first timer after a first time interval following the completion of the PRACH transmission; while the first timer is running, it monitors a first PDCCH; wherein the first time interval includes Q1 symbols, and Q1 is a non-negative integer; the first PDCCH indicates scheduling information for receiving a random access response; the first receiver 1301 starts a second timer after a second time interval following a first reference time; while the second timer is running, it monitors a second PDCCH; wherein the first reference time is associated with the transmission of the PRACH; the second time interval includes Q2 symbols, and Q2 is 0 or an integer greater than 0; the second PDCCH indicates scheduling information for receiving the on-demand SIB1.

[0588] As an example, the first receiver 1301 starts a second timer after a second time interval following a first reference time; while the second timer is running, it monitors a second PDCCH; wherein, the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the reception of the on-demand SIB1 scheduling information; and the first receiver 1301, in response to receiving the on-demand SIB1, camps on the first cell.

[0589] As one embodiment, the first receiver 1301 starts a second timer after a second time interval following a first reference time; while the second timer is running, it monitors a second PDCCH; wherein the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the scheduling information for receiving the on-demand SIB1; and the first receiver 1301 performs cell reselection in response to the expiration of the second timer and the failure to receive the on-demand SIB1.

[0590] As one embodiment, the first receiver 1301 starts a second timer after a second time interval following a first reference time; while the second timer is running, it monitors a second PDCCH; wherein, the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the scheduling information for receiving the on-demand SIB1; the SSB includes a first field, and the candidate values ​​of the first field indicate transmitting SIB1, not transmitting SIB1, and transmitting the on-demand SIB1.

[0591] As an example, the first node 1300 is the first node in this application.

[0592] As one embodiment, the first receiver 1301 includes a receiver 454 (including an antenna 452) as shown in Figure 4 of this application, a receiver processor 456, a multi-antenna receiver processor 458, and a controller / processor 459.

[0593] As one embodiment, the first receiver 1301 includes at least one of the receiver 454 (including antenna 452) in Figure 4 of this application, a receiver processor 456, a multi-antenna receiver processor 458, or a controller / processor 459.

[0594] As one embodiment, the first transmitter 1302 includes the transmitter 454 (including antenna 452) in Figure 4 of this application, the transmission processor 468, the multi-antenna transmission processor 457 and the controller / processor 459.

[0595] As one embodiment, the first transmitter 1302 includes at least one of the transmitter 454 (including antenna 452) in Figure 4 of this application, a transmission processor 468, a multi-antenna transmission processor 457, or a controller / processor 459.

[0596] Example 14

[0597] Example 14 illustrates a structural block diagram of a processing apparatus in a second node according to an embodiment of the present application, as shown in Figure 14.

[0598] In Figure 14, the second node processing device 1400 includes a second receiver 1401 and a second transmitter 1402. The second node 1400 is a base station, or a gNB DU (Distributed Unit).

[0599] In embodiment 14, the second transmitter 1402 transmits an SSB in a first cell, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; wherein, the first cell is selected; the first node transmits a PRACH on the first cell, or performs cell reselection; whether the first node transmits a PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource, and the first configuration is associated with the first cell; the second configuration indicates a second random access resource, and the second configuration is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

[0600] As one embodiment, the first configuration is available on the first node, and the first node sends the PRACH in the first random access resource indicated by the first configuration; wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

[0601] As one embodiment, the second configuration is available on the first node, and the first node sends the PRACH in the second random access resource indicated by the second configuration; wherein the first node only maintains the second configuration.

[0602] As an example, if neither the first configuration nor the second configuration is available on the first node, the first node performs the cell reselection.

[0603] As one embodiment, the second transmitter 1402 transmits the first configuration in a second cell, the first configuration being associated with at least the first cell; wherein the second cell and the first cell are two different cells.

[0604] As one embodiment, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH.

[0605] As one embodiment, the second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH; the frequency domain resource occupied by the SSB overlaps with the first frequency domain resource.

[0606] As one embodiment, the second transmitter 1402 transmits a first PDCCH; wherein, after the PRACH transmission ends, a first timer is started after a first time interval; while the first timer is running, the first PDCCH is monitored; the first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates scheduling information for receiving random access responses.

[0607] As one embodiment, the second transmitter 1402 transmits a first PDCCH; wherein, after the PRACH transmission ends, a first timer is started after a first time interval; while the first timer is running, the first PDCCH is monitored; the first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates scheduling information for receiving a random access response; the second transmitter 1402 transmits a second PDCCH; wherein, after a first reference time, a second timer is started after a second time interval; while the second timer is running, the second PDCCH is monitored; the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates scheduling information for receiving the on-demand SIB1.

[0608] As one embodiment, the second transmitter 1402 transmits a second PDCCH; wherein, after a first reference time, a second timer is started after a second time interval; while the second timer is running, the second PDCCH is monitored; the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the scheduling information for receiving the on-demand SIB1; the second transmitter 1402 transmits the on-demand SIB1; wherein, as a response from the first node receiving the on-demand SIB1, the first node is camped on the first cell.

[0609] As one embodiment, the second transmitter 1402 transmits a second PDCCH; wherein, after a first reference time, a second timer is started after a second time interval; while the second timer is running, the second PDCCH is monitored; the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the scheduling information for receiving the on-demand SIB1; as a response to the second timer expiring and the on-demand SIB1 not being received, the first node performs cell reselection.

[0610] As one embodiment, the second transmitter 1402 transmits a second PDCCH; wherein, after a first reference time, a second timer is started after a second time interval; the second PDCCH is monitored while the second timer is running; the first reference time is associated with transmitting the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the scheduling information for receiving the on-demand SIB1; the SSB includes a first field, and the candidate values ​​of the first field indicate transmitting SIB1, not transmitting SIB1, and transmitting the on-demand SIB1.

[0611] As an example, the second node 1400 is the second node in this application.

[0612] As one embodiment, the second receiver 1401 includes the receiver 418 (including antenna 420) in Figure 4 of this application, the receiver processor 470, the multi-antenna receiver processor 472 and the controller / processor 475.

[0613] As one embodiment, the second receiver 1401 includes at least one of the receiver 418 (including antenna 420) in Figure 4 of this application, a receiver processor 470, a multi-antenna receiver processor 472, or a controller / processor 475.

[0614] As one embodiment, the second transmitter 1402 includes the transmitter 418 (including antenna 420) shown in Figure 4 of this application, the transmission processor 416, the multi-antenna transmission processor 471, and the controller / processor 475.

[0615] As one embodiment, the second transmitter 1402 includes at least one of the transmitter 418 (including antenna 420) in Figure 4 of this application, a transmission processor 416, a multi-antenna transmission processor 471, and a controller / processor 475.

[0616] Those skilled in the art will understand that all or part of the steps in the above methods can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium, such as a read-only memory, hard disk, or optical disk. 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 or in the form of software functional modules. This application is not limited to any specific combination of software and hardware. The first type of communication node or UE or terminal in this application includes, but is not limited to, mobile phones, tablets, laptops, network cards, low-power devices, eMTC (enhanced Machine Type Communication) devices, NB-IoT devices, vehicle communication devices, aircraft, drones, remote-controlled aircraft, and other wireless communication devices. The second type of communication node or base station or network-side equipment in this application includes, but is not limited to, macrocell base stations, microcell base stations, home base stations, relay base stations, eNBs, gNBs, Transmission and Reception Points (TRPs), relay satellites, satellite base stations, airborne base stations, and testing equipment, such as transceivers simulating some functions of a base station, signaling testers, and other wireless communication equipment.

[0617] Those skilled in the art will understand that the present invention can be practiced in other specified forms without departing from its core or essential characteristics. Therefore, the embodiments disclosed herein should in any way be considered descriptive rather than restrictive. The scope of the invention is defined by the appended claims rather than the foregoing description, and all modifications within their equivalent meaning and scope are considered to be included therein.

Claims

1. A method used in a first node of wireless communication, characterized in that, include: Receive an SSB in the first cell and select the first cell, the SSB indicating that only on-demand SIB1 is transmitted in the first cell; Send PRACH on the first cell, or perform cell reselection; Whether the first node sends the PRACH or performs the cell reselection on the first cell depends on whether the target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node sends the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

2. The method in the first node according to claim 1, characterized in that, The first configuration is available on the first node, and the PRACH is sent in the first random access resource indicated by the first configuration; Wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

3. The method in the first node according to any one of claims 1 or 2, characterized in that, The second configuration is available on the first node, and the PRACH is sent in the second random access resource indicated by the second configuration; The first node maintains only the second configuration.

4. The method in the first node according to any one of claims 1 to 3, characterized in that, If neither the first configuration nor the second configuration is available at the first node, cell reselection is performed.

5. The method in the first node according to any one of claims 1 to 4, characterized in that, include: The first configuration is received from the second cell, and the first configuration is associated with at least the first cell; The second cell and the first cell are two different cells.

6. The method in the first node according to any one of claims 1 to 5, characterized in that, The second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH.

7. The method in the first node according to claim 6, characterized in that, The frequency domain resources occupied by the SSB overlap with the first frequency domain resources.

8. The method in the first node according to any one of claims 1 to 7, characterized in that, include: The first timer is started after a first time interval following the completion of the PRACH transmission. While the first timer is running, the first PDCCH is monitored; The first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving random access responses.

9. The method in the first node according to claim 8, characterized in that, include: The second timer is started after the second time interval following the first reference time; While the second timer is running, the second PDCCH is monitored; Wherein, the first reference time is associated with sending the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; and the second PDCCH indicates the reception of the on-demand SIB1 scheduling information.

10. The method in the first node according to claim 9, characterized in that, include: In response to receiving the on-demand SIB1, it camps on the first cell.

11. The method in the first node according to any one of claims 9 or 10, characterized in that, include: As a response to the expiration of the second timer and the failure of the on-demand SIB1 to be received, cell reselection is performed.

12. The method in the first node according to any one of claims 9 or 10, characterized in that, The SSB includes a first field, and the candidate values ​​of the first field indicate whether to send SIB1, not to send SIB1, or to send the on-demand SIB1.

13. A terminal, characterized in that, The terminal includes: one or more processors and memory; The memory is coupled to the one or more processors, the memory being used to store computer program code, the computer program code including computer instructions, the one or more processors invoking the computer instructions to cause the terminal to perform the method as described in any one of claims 1-12.

14. A method used in a second node of wireless communication, characterized in that, include: In the first cell, an SSB is sent, the SSB indicating that only on-demand SIB1 is sent in the first cell; Wherein, the first cell is selected; the first node transmits a PRACH on the first cell or performs cell reselection; whether the first node transmits the PRACH on the first cell or performs cell reselection depends on whether a target configuration is available on the first node; the target configuration includes at least one of a first configuration and a second configuration; the first configuration indicates a first random access resource and is associated with the first cell; the second configuration indicates a second random access resource and is not associated with the first cell; when the first node transmits the PRACH on the first cell, the PRACH occupies one of the first random access resource or the second random access resource.

15. The method in the second node according to claim 14, characterized in that, The first configuration is available on the first node, and the first node sends the PRACH in the first random access resource indicated by the first configuration; Wherein, the first node maintains only the first configuration, or the first node maintains both the first configuration and the second configuration.

16. The method in the second node according to any one of claims 14 or 15, characterized in that, The second configuration is available on the first node, and the first node sends the PRACH in the second random access resource indicated by the second configuration; The first node maintains only the second configuration.

17. The method in the second node according to any one of claims 14 to 16, characterized in that, Neither the first configuration nor the second configuration is available at the first node, and the first node performs the cell reselection.

18. The method in the second node according to any one of claims 14 to 17, characterized in that, include: The first configuration is sent in the second cell, and the first configuration is associated with at least the first cell; The second cell and the first cell are two different cells.

19. The method in the second node according to any one of claims 14 to 18, characterized in that, The second configuration may include: the second random access resource includes a first frequency domain resource, the first frequency domain resource overlaps with the frequency domain resource of the first cell, and the first frequency domain resource can at least transmit the PRACH.

20. The method in the second node according to claim 19, characterized in that, The frequency domain resources occupied by the SSB overlap with the first frequency domain resources.

21. The method in the second node according to any one of claims 14 to 20, characterized in that, include: Send the first PDCCH; Wherein, after the PRACH transmission ends, a first timer is started after a first time interval; while the first timer is running, the first PDCCH is monitored; the first time interval includes Q1 symbols, where Q1 is a non-negative integer; the first PDCCH indicates the scheduling information for receiving random access responses.

22. The method in the second node according to claim 21, characterized in that, include: Send the second PDCCH; The second timer is activated after a second time interval following the first reference time. While the second timer is running, the second PDCCH is monitored; the first reference time is associated with sending the PRACH; the second time interval includes Q2 symbols, where Q2 is 0 or an integer greater than 0; the second PDCCH indicates the reception of the on-demand SIB1 scheduling information.

23. The method in the second node according to claim 22, characterized in that, include: Send SIB1 on demand; In this context, the first node resides on the first cell as a response to the on-demand SIB1 received by the first node.

24. The method in the second node according to any one of claims 22 or 23, characterized in that, In response to the expiration of the second timer and the failure to receive the on-demand SIB1, the first node performs cell reselection.

25. The method in the second node according to any one of claims 22 or 23, characterized in that, The SSB includes a first field, and the candidate values ​​of the first field indicate whether to send SIB1, not to send SIB1, or to send the on-demand SIB1.

26. A base station, characterized in that, The base station includes: one or more processors and a memory; The memory is coupled to the one or more processors, the memory being used to store computer program code, the computer program code including computer instructions, the one or more processors invoking the computer instructions to cause the base station to perform the method as described in any one of claims 14 to 25.

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