Method and device for wireless communication

Abstract

The present application discloses a method and device for wireless communication. The method comprises: sending at least one paging message, a first paging message being any one of the at least one paging message, and the first paging message paging a second node, wherein a first value identifies the first paging message, and whether random access is triggered depends on the first value. Whether random access is triggered depending on the first value comprises that: random access is triggered only when the second node fails to successfully initiate random access in response to a paging message identified by the first value. The method provided in the present application is conducive to reducing power consumption, prolonging the service life of a device, reducing the probability of conflicts, saving resources, and improving scalability and applicability.

Description

A method and apparatus for wireless communication TECHNICAL FIELD

[0001] The present application relates to methods and apparatuses related to paging and random access in wireless communication systems, and in particular to Internet of Things, non-cellular communication. BACKGROUND

[0002] Application scenarios of future wireless communication systems are increasingly diversified, and different application scenarios put forward different performance requirements for the system. In order to meet the different performance requirements of various application scenarios, it is decided at the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #72 plenary meeting to study New Radio (NR) (or Fifth Generation, 5G), and the NR WI (Work Item) is passed at the 3GPP RAN #75 plenary meeting, and the standardization work of NR begins.

[0003] In communication, whether it is LTE (Long Term Evolution) or 5G NR, it involves accurate reception of reliable information, optimized energy efficiency, determination of information effectiveness, flexible resource allocation, scalable system structure, efficient non-access layer information processing, low service interruption and drop rate, support for low power consumption, which is of great significance to the normal communication of base stations and user equipment, reasonable scheduling of resources, and balancing of system load. It can be said that it is the cornerstone of high throughput, meeting the communication needs of various services, improving spectrum utilization, and improving service quality. Whether it is eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication) or eMTC (enhanced Machine Type Communication) is indispensable. At the same time, in IIoT (Industrial Internet of Things), in V2X (Vehicular to X) communication, in Device to Device communication, in unlicensed spectrum communication, in user communication quality monitoring, in network planning optimization, in TN (Territerial Network) communication, in Dual connectivity system, in wireless resource management and multi-antenna codebook selection, in signaling design, neighbor management, service management, and in beamforming, there are extensive demands. The transmission mode of information is divided into broadcast and unicast, and the two transmission modes are indispensable for 5G systems because they are very helpful in meeting the above demands.

[0004] In the latest discussion, 3GPP will focus on A-IoT (Ambient IoT or AIoT) devices, which are extremely simple devices. Typical AIoT devices do not actively initiate communication and even have no battery and power amplifier and rely on wireless signals transmitted by other devices to collect energy. Obviously, the communication mode of such devices is completely different from traditional cellular communication. AIoT has broad application prospects and will play an important role in future communication including 6G. SUMMARY

[0005] The researchers find that the nodes generally paged need to respond to the paging message when received, that is, initiate random access, but for the scenario targeted by the present application, how to avoid the paged node that initiates random access successfully for the paging message identified by the first value from repeatedly initiating random access is a problem to be solved.

[0006] To solve the above problems, the present application provides a solution.

[0007] It should be noted that the embodiments in any node of the present application and the features in the embodiments can be applied to any other node without conflict. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict. At the same time, the method proposed in the present application can also be used to solve other problems in communication, such as problems in NR evolution and 6G system.

[0008] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement TS38 series of 3GPP.

[0009] As an embodiment, the explanation of the terminology in the present application refers to the definition of the specification agreement TS37 series of 3GPP.

[0010] The present application discloses a method used in a first node for wireless communication, comprising: sending at least one paging message, a first paging message is any one of the at least one paging message, the first paging message pages a second node, wherein a first value identifies the first paging message, whether random access is triggered depends on the first value.

[0011] Wherein, whether random access is triggered depends on the first value includes: only when the second node does not initiate random access successfully for the paging message identified by the first value, random access is triggered.

[0012] As an embodiment, the problem to be solved by the present application includes: how to indicate a paging message to assist the paged to determine whether random access needs to be initiated for this paging message. How to avoid repeated response to repeated and needed content / service paging.

[0013] As an embodiment, the benefits of the above method include: saving power, especially suitable for AIoT (A-IoT) devices, avoiding repeated initiation of random access, low complexity, saving resources.

[0014] Specifically, according to an aspect of the present application, the first value is used to determine whether to initiate random access comprises: when the second node successfully initiates random access for the paging message identified by the first value, the second node gives up initiating random access.

[0015] Specifically, according to an aspect of the present application, the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging message identified by the first value, which is only true within a first time window;

[0016] Wherein, the length of the first time window is limited.

[0017] Specifically, according to an aspect of the present application, the paging message identified by the first value is all sent by the first node.

[0018] Specifically, according to an aspect of the present application, the successful initiation of random access comprises successful completion of data transmission.

[0019] Specifically, according to an aspect of the present application, the first paging message indicates whether the first value is used to determine whether to initiate random access is effective.

[0020] Specifically, according to an aspect of the present application, the first paging message includes the first value.

[0021] Specifically, according to an aspect of the present application, a first signal is sent along with the first paging message, and the first signal indicates the first value.

[0022] Specifically, according to an aspect of the present application, the first signal is an additional paging message, or a segment of a paging message.

[0023] Specifically, according to an aspect of the present application, the first node is a user equipment.

[0024] Specifically, according to an aspect of the present application, the first node is a vehicle terminal.

[0025] Specifically, according to an aspect of the present application, the first node is a mobile phone.

[0026] Specifically, according to an aspect of the present application, the first node is a network node.

[0027] The present application discloses a method used in a second node for wireless communication, comprising: receiving at least one paging message, a first paging message is any one of the at least one paging message, the first paging message paging a second node, wherein a first value identifies the first paging message, and whether random access is triggered depends on the first value.

[0028] wherein whether random access is triggered depends on the first value comprises that random access is triggered only when the second node fails to successfully initiate random access for a paging message identified by the first value.

[0029] In particular, according to an aspect of the present application, the first value being used to determine whether to initiate random access comprises that the second node gives up initiating random access when the second node successfully initiates random access for a paging message identified by the first value.

[0030] In particular, according to an aspect of the present application, the first paging message triggers the second node to initiate random access only when the second node fails to successfully initiate random access for a paging message identified by the first value, which is only valid within a first time window.

[0031] wherein the length of the first time window is limited.

[0032] In particular, according to an aspect of the present application, the paging message identified by the first value is all sent by the first node.

[0033] In particular, according to an aspect of the present application, the successfully initiating random access comprises successfully completing transmission of data.

[0034] In particular, according to an aspect of the present application, the first paging message indicates whether the first value is used to determine whether to initiate random access is valid.

[0035] In particular, according to an aspect of the present application, the first paging message comprises the first value.

[0036] In particular, according to an aspect of the present application, a first signal is received along with the first paging message, the first signal indicating the first value.

[0037] In particular, according to an aspect of the present application, the first signal is an additional paging message, or a segment of a paging message.

[0038] In particular, according to an aspect of the present application, the second node is a device.

[0039] In particular, according to an aspect of the present application, the second node is a terminal.

[0040] In particular, according to an aspect of the present application, the second node is an AIoT device.

[0041] In particular, according to an aspect of the present application, the second node is a circuit card.

[0042] The application discloses a first node used in wireless communication, comprising:

[0043] The first transmitter transmits at least one paging message, the first paging message is any one of the at least one paging message, and the first paging message pages the second node, wherein the first value identifies the first paging message, and whether random access is triggered depends on the first value.

[0044] The first value comprises: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0045] The application discloses a second node used in wireless communication, comprising:

[0046] The first receiver receives at least one paging message, the first paging message is any one of the at least one paging message, and the first paging message pages the second node, wherein the first value identifies the first paging message, and whether random access is triggered depends on the first value.

[0047] The first value comprises: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0048] As an embodiment, compared with the conventional scheme, the application has the following advantages:

[0049] The conventional communication device stops receiving paging after receiving the paging, until the communication is completed, and the received paging is considered as a new paging after the communication is completed.

[0050] The conventional communication device can actively initiate random access, for example, when the current random access is unsuccessful, the random access can be actively initiated again, so that the success rate of paging response is high enough.

[0051] AIoT communication is different. According to different application scenarios, a large number of AIoT devices are distributed around the reading device, and the reading device often pages multiple AIoT devices through multicast or broadcast; the application scenario of a single AIoT device is also single and fixed, for example, reporting inventory information. Since the AIoT device does not actively initiate random access, for the AIoT device that has failed to successfully access the previous time, for example, the signal is not good or a conflict occurs, it will not actively initiate random access again, but needs the next network paging, which is one of the biggest differences from other communication devices. Each paging is often treated as a new independent communication process. If all the paged AIoT devices re-initiate random access at the next paging, not only is power wasted, but the possibility of conflict is also increased, which can also lead to incorrect inventory statistics. The method proposed in the present application can effectively avoid re-initiating random access for the paged AIoT devices that have already responded.

[0052] An AIoT communication process includes a random access. However, due to the single application scenario, for example, reporting inventory, the next (multicast broadcast mode) paging is still reporting inventory, so repeated paging due to the same reason and responding due to the same reason are not rare, but typical. The method proposed in the present application solves a typical problem and has wide application. And it will not affect the normal paging response.

[0053] Other advantages of the present application include: lower complexity, certain flexibility, avoiding false positives, saving power, saving resources, avoiding conflicts, and better supporting multicast and broadcast-based paging, i.e., paging a group or paging all objects. BRIEF DESCRIPTION OF DRAWINGS

[0054] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings:

[0055] FIG. 1 shows a schematic diagram of sending at least one paging message according to one embodiment of the present application;

[0056] FIG. 2 shows a schematic diagram of a network architecture according to one embodiment of the present application;

[0057] FIG. 3 shows a schematic diagram of an embodiment of a wireless protocol architecture of a user plane and a control plane according to one embodiment of the present application;

[0058] FIG. 4 shows a schematic diagram of a first communication device and a second communication device according to one embodiment of the present application;

[0059] FIG. 5 shows a flowchart of wireless signal transmission according to one embodiment of the present application;

[0060] FIG. 6 shows a schematic diagram of at least one paging message according to an embodiment of the present application;

[0061] FIG. 7 shows a schematic diagram of at least one paging message according to an embodiment of the present application;

[0062] FIG. 8 shows a schematic diagram of a first time window according to an embodiment of the present application;

[0063] FIG. 9 shows a schematic diagram of a first paging message according to an embodiment of the present application;

[0064] FIG. 10 shows a schematic diagram of a first air interface according to an embodiment of the present application;

[0065] FIG. 11 shows a schematic diagram of a processing apparatus for use in a first node according to an embodiment of the present application;

[0066] FIG. 12 shows a schematic diagram of a processing apparatus for use in a second node according to an embodiment of the present application;

[0067] FIG. 13 shows a schematic diagram of a structure of an A-IoT device according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0069] Embodiment 1

[0070] Embodiment 1 shows a flowchart of sending at least one paging message according to an embodiment of the present application, as shown in FIG. 1. In FIG. 1, each block represents a step, and it is particularly emphasized that the order of the blocks in the figure does not represent the time sequence between the steps represented.

[0071] In embodiment 1, the first node in the present application sends at least one paging message in step 101;

[0072] Wherein, the first paging message is any one of the at least one paging message, and the first paging message pages the second node, wherein the first value identifies the first paging message, and whether random access is triggered depends on the first value.

[0073] Wherein, whether random access is triggered depends on the first value includes: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0074] As one embodiment, the first node is a UE (User Equipment).

[0075] As one embodiment, the first node is a terminal.

[0076] As one embodiment, the first node is in RRC connected state.

[0077] As one embodiment, any parameter in this application is either configured by network or can be generated by the first node according to internal algorithm, e.g., random.

[0078] As one embodiment, the value of any timer in this application is limited, all of which are no more than 2560 ms.

[0079] As one embodiment, the value of a timer is the running time of the timer when it is not intervened.

[0080] As one embodiment, the value of any parameter in this application, including but not limited to the value of a timer, the value of a counter, is limited unless specifically stated.

[0081] As one sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 1024 times of 65536.

[0082] As one sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 65536 or 65535.

[0083] As one sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 1024.

[0084] As one sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 640 or 320.

[0085] As one embodiment, this application is for NR.

[0086] As one embodiment, this application is for NR evolved wireless communication network.

[0087] As one embodiment, L1 is Layer-1 or physical layer.

[0088] As one embodiment, L2 is Layer-2.

[0089] As one embodiment, this application is for NR and NR evolved network, e.g., 6G network.

[0090] As one embodiment, any of the at least one paging message is for AIoT device.

[0091] As one embodiment, any of the at least one paging message is for the second node.

[0092] As one embodiment, there is no other paging message related to the second node sent by the first node between any two adjacent paging messages of the at least one paging message.

[0093] As one embodiment, the at least one paging message is all paging messages sent by the first node in a time period.

[0094] As one sub-embodiment of this embodiment, the all paging messages are paging messages related to the second node.

[0095] As one sub-embodiment of this embodiment, the all paging messages are paging messages for the second node.

[0096] As one embodiment, the at least one paging message is sent over an air interface other than a Uu interface.

[0097] As one embodiment, the at least one paging message is sent over an air interface other than a PC5 interface.

[0098] As one embodiment, the at least one paging message is sent over an air interface between a UE and an AIoT device.

[0099] As one embodiment, the at least one paging message is the first paging message.

[0100] As one embodiment, the at least one paging message is a plurality of paging messages; the first value identifies the plurality of paging messages.

[0101] As one embodiment, the at least one paging message is a plurality of paging messages; the first value identifies part of the plurality of paging messages.

[0102] As one embodiment, when the second node has successfully initiated random access for a paging message identified by the first value, the second node gives up initiating random access for the first paging message.

[0103] As one sub-embodiment of this embodiment, the at least one paging message includes a plurality of paging messages.

[0104] As one embodiment, the second node determines whether to initiate random access according to the first value.

[0105] As one embodiment, the second node does not actively initiate random access.

[0106] As one embodiment, the second node does not actively initiate a random access attempt when a random access attempt is unsuccessful.

[0107] As one embodiment, the second node receives the at least one paging message.

[0108] As one embodiment, the second node is not a network device.

[0109] As one embodiment, the second node is a device.

[0110] As one embodiment, the device is an IoT device.

[0111] As one embodiment, the IoT device is an AIoT device.

[0112] As one embodiment, the device is a device that cannot actively initiate a random access.

[0113] As one embodiment, the device is a device that does not have a power amplifier.

[0114] As one embodiment, the first paging message indicates the first number.

[0115] As one embodiment, the first paging message includes the first number.

[0116] As one embodiment, the first paging message includes an identity of the second node.

[0117] As one embodiment, the first paging message includes an identity of a group to which the second node belongs.

[0118] As one embodiment, the first paging message paging the second node includes the first paging message paging a group to which the second node belongs.

[0119] As one embodiment, the first paging message does not include an identity of any device.

[0120] As one sub-embodiment of this embodiment, the first paging message not including an identity of any device indicates that the first paging message pages all devices.

[0121] As one embodiment, the first paging message does not include an identity of a pagee.

[0122] As one sub-embodiment of this embodiment, the first paging message not including an identity of any device indicates that the first paging message pages all devices.

[0123] As one embodiment, the at least one paging message is sent via groupcast.

[0124] As one embodiment, the at least one paging message is sent by broadcast.

[0125] As one embodiment, the at least one paging message pages a group, the second node being one of the group.

[0126] As one embodiment, the at least one paging message pages all devices, the second node being one of the all devices.

[0127] As one embodiment, the first paging message paging the second node comprises: the first paging message comprising an identity of the second node.

[0128] As one sub-embodiment of this embodiment, the first paging message comprises an identity of a node other than the second node.

[0129] As one sub-embodiment of this embodiment, the node other than the second node is an AIoT device.

[0130] As one embodiment, the first paging message paging the second node comprises: the first paging message comprising an identity of a group to which the second node belongs.

[0131] As one embodiment, the first paging message paging the second node comprises: the first paging message not comprising an identity of any device.

[0132] As one sub-embodiment of this embodiment, the first paging message not comprising an identity of any device is for paging all devices.

[0133] As one embodiment, the first paging message is a paging.

[0134] As one embodiment, a node other than the second node being paged by the first paging message determines whether to initiate random access for the first paging message according to whether it has successfully initiated random access for a paging message identified by the first value.

[0135] As one embodiment, the second node always initiates random access for a paging message identified by the first value.

[0136] As one embodiment, the first value is one bit.

[0137] As one embodiment, the first value comprising one bit reduces signaling overhead.

[0138] As one embodiment, the first value comprises multiple bits.

[0139] As one embodiment, the first number includes a plurality of bits has the advantage of more accurate identification of the paging message, avoiding duplication.

[0140] As one embodiment, the first number can be reused.

[0141] As one embodiment, the first number includes 2 bits.

[0142] As one embodiment, the first number includes 3 bits.

[0143] As one embodiment, the first number includes 4 bits.

[0144] As one embodiment, the first number includes more than 4 bits.

[0145] As one embodiment, the at least one paging message is periodically transmitted.

[0146] As one embodiment, the at least one paging message is not required to be periodically transmitted.

[0147] As one embodiment, the first number identifying the first paging message includes that the first number is an identity or index of the first paging message.

[0148] As one embodiment, the first number identifying the first paging message includes that the first number has a corresponding or mapping relationship with the first paging message.

[0149] As one embodiment, the first number being used to determine whether to initiate random access includes that when the second node successfully initiates random access for the paging message identified by the first number, the second node gives up initiating random access.

[0150] As one embodiment, the second node giving up initiating random access includes not responding to the first paging message.

[0151] As one embodiment, the first paging message triggering the second node to initiate random access only when the second node does not successfully initiate random access for the paging message identified by the first number is only true within a first time window.

[0152] As one sub-embodiment of this embodiment, the length of the first time window is limited.

[0153] As one embodiment, the length of the first time window is fixed.

[0154] As one embodiment, the length of the first time window is configurable.

[0155] As one embodiment, the first paging message indicates the first time window.

[0156] As one embodiment, the first paging message indicating the first time window comprises: a length of the first time window is indicated by the first paging message.

[0157] As one embodiment, the first paging message indicating the first time window comprises: the first paging message indicates whether to use a first time window.

[0158] As one embodiment, the paging messages identified by the first value are all sent by the first node.

[0159] As one embodiment, the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging messages identified by the first value, which is only true for paging messages sent by the same node.

[0160] As one embodiment, the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging messages identified by the first value, which is for paging messages sent by multiple nodes.

[0161] As one embodiment, the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging messages identified by the first value, which is for paging messages sent by any node.

[0162] As one sub-embodiment of this embodiment, the paging message is a paging message for the device.

[0163] As one sub-embodiment of this embodiment, the paging message is a paging message on a first air interface.

[0164] As one embodiment, the first air interface is an air interface between a UE and an AIoT device.

[0165] As one embodiment, the first node determines the first value by itself.

[0166] As one embodiment, the first node determines the first value by itself comprises: the first node determines the value of the identification of any paging message by itself.

[0167] As one embodiment, the first node determines the first value according to an indication of a network.

[0168] As one sub-embodiment of this embodiment, the network comprises a base station.

[0169] As one sub-emebdiment of this embodiment, the network comprises a core network.

[0170] As one embodiment, the first node determining the first value according to an indication of the network comprises: the network indicating the first value.

[0171] As one embodiment, the first node determining the first value according to an indication of the network comprises: the network indicating an identity of the paging message.

[0172] As one embodiment, the successfully initiating the random access comprises successfully completing transmission of data.

[0173] As one embodiment, the successfully completing transmission of data comprises receiving a first acknowledgement message.

[0174] As one sub-emebdiment of this embodiment, the first acknowledgement message acknowledges completion of data transmission.

[0175] As one sub-emebdiment of this embodiment, the first acknowledgement message instructs the second node to stop transmitting and / or receiving.

[0176] As one sub-emebdiment of this embodiment, the first acknowledgement message instructs the second node to enter a sleep state.

[0177] As one sub-emebdiment of this embodiment, the first acknowledgement message instructs the second node to leave a transmission state.

[0178] As one sub-emebdiment of this embodiment, the first acknowledgement message instructs the second node to leave an access state.

[0179] As one embodiment, the second node does not support transmitting data through a process other than random access.

[0180] As one embodiment, the first paging message indicates that the first value is used to determine whether initiation of random access is effective.

[0181] As one embodiment, the first paging message indicates that whether random access is triggered depends on whether the first value is effective.

[0182] As one embodiment, the above method has high flexibility.

[0183] As one embodiment, when the first paging message indicates that whether random access is triggered depends on whether the first value is effective: random access is triggered only when the second node does not successfully initiate random access for a paging message identified by the first value.

[0184] As one embodiment, when the first paging message indicates that whether random access is triggered depends on the first value is not valid: the second node initiates random access for the first paging message.

[0185] As one embodiment, the initiating random access for the first paging message means that the first paging message triggers to initiate random access.

[0186] As one embodiment, the initiating random access for the first paging message means that random access is initiated according to the first paging message.

[0187] As one embodiment, the first paging message includes the first value.

[0188] As one embodiment, the first paging message includes the first value has the advantage of low complexity, without the need for additional receiving process.

[0189] As one embodiment, the first paging message is an additional paging message, or a segment of a paging message.

[0190] Embodiment 2

[0191] Embodiment 2 illustrates a schematic diagram of a network architecture according to the present application, as shown in FIG. 2.

[0192] FIG. 2 illustrates a diagram of a network architecture 200 for a 5G NR, LTE (Long-Term Evolution), and LTE-A (Long-Term Evolution Advanced) system. The 5G NR or LTE network architecture 200 can be referred to as a 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 can 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 appreciate, that the various concepts presented throughout this application are amenable to use with networked systems including a mixture of packet-switched and circuit-switched services or other cellular networks. The NG-RAN includes an NR Node-B (gNB) 203 and other gNBs 204. The gNB 203 provides user and control plane protocol terminations toward the UE 201. The gNB 203 can be connected to the other gNBs 204 via an Xn interface (e.g., backhaul). The gNB 203 can also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (Transmit Receive Point), or some other suitable terminology. The gNB 203 provides access to the 5GC / EPC 210 for the UE 201. Examples of UEs 201 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a non-tower based communication, satellite mobile communication, global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a drone, a flying vehicle, a narrowband internet of things device, a machine type communication device, a land vehicle, a car, a wearable device, or any other similar functional device. Those skilled in the art will also readily appreciate that the UE 201 can be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wirelessThe gNB 203 is connected to the 5GC / EPC 210 over an S1 / NG interface. The 5GC / EPC 210 includes a MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, a S-GW (Service Gateway) / UPF (User Plane Function) 212, and a P-GW (Packet Date Network Gateway) / UPF 213. The MME / AMF / SMF 211 is a control node that handles signaling between the UE 201 and the 5GC / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocal) packets are transferred through the S-GW / UPF 212, which is itself connected to the P-GW / UPF 213. The P-GW provides UE IP address allocation, as well as other functions. The P-GW / UPF 213 is connected to Internet services 230. The Internet services 230 include operator corresponding Internet protocol services, and can specifically include the Internet, an intranet, an IMS (IP Multimedia Subsystem), and a packet exchange streaming service.

[0193] As one embodiment, the first node in the present application is the UE 201.

[0194] As one embodiment, the base station of the second node in the present application is the gNB 203.

[0195] As one embodiment, the wireless link from the UE 201 to the NR Node B is an uplink.

[0196] As one embodiment, the wireless link from the NR Node B to the UE 201 is a downlink.

[0197] As one embodiment, the UE 201 is a mobile phone.

[0198] As one embodiment, the UE 201 is a special-purpose device or a special device with communication functions.

[0199] As one embodiment, the gNB 203 is a micro cell base station.

[0200] As one example, the gNB 203 is a Pico Cell base station.

[0201] As one example, the gNB 203 is a base station used in a home network.

[0202] As one example, the gNB 203 is a base station used in a private network.

[0203] As one example, the gNB 203 is a base station used in an enterprise network.

[0204] Embodiment 3

[0205] Embodiment 3 shows a diagram of an embodiment of a radio protocol architecture for a user plane and a control plane according to the present application, as shown in FIG. 3. FIG. 3 is a diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, which shows the radio protocol architecture for the control plane 300 between a first node (UE, gNB) and a second node (gNB, UE), or two UEs, in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (LI layer) is the lowest layer and implements various PHY (Physical layer) signal processing functions. The LI layer will be referred to as the PHY 301 herein. Layer 2 (L2 layer) 305 is above the PHY 301 and is responsible for the link between the first node and the second node, as well as between two UEs, through the PHY 301. The L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, a RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which are terminated at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security functions, such as ciphering of the data packets, and packet head compression, as well as handover support for the first node between the second nodes. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell among the UEs. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the second node and the first node. The PC5-S (PC5 Signaling Protocol) sublayer 307 is responsible for handling the signaling protocol for the PC5 interface. The radio protocol architecture for the user plane 350 includes Layer 1 (LI layer) and Layer 2 (L2 layer), which are generally the same as the corresponding layers and sublayers in the control plane 300 for the PHY 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355 for the first node and the second node in the user plane 350, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead.The L2 layer 355 in the user plane 350 also includes a SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for the mapping between a QoS flow and a data radio bearer (DRB) to support the diversity of services. An SRB can be seen as a service or interface provided by the PDCP sublayer to a higher layer, such as the RRC sublayer. In the NR system, SRBs include SRB1, SRB2, and SRB3, which are used to transmit different types of control signaling. An SRB is a bearer between a UE and an access network, used to transmit control signaling including RRC signaling between the UE and the access network. SRB1 is of particular significance to the UE, and each UE establishes an RRC connection after which there is an SRB1 for transmitting RRC signaling, and most signaling is transmitted through SRB1. If SRB1 is interrupted or cannot be used, the UE must perform RRC reestablishment. SRB2 is generally used only to transmit NAS signaling or signaling related to security. The UE can not configure SRB3. Except for emergency services, the UE must establish an RRC connection with the network to enable subsequent communication. Although not shown, the first node can have several upper layers above the L2 layer 355. In addition, there is a network layer (e.g., IP layer) that terminates at a P-GW on the network side and an application layer that terminates at the other end of the connection (e.g., a remote UE, a server, etc.). The protocol layers can also be referred to as protocol sublayers. FIG. 3 shows a general protocol layer structure, and the nodes used in the present application can lack some of the protocol layers.

[0206] As one embodiment, the wireless protocol architecture in FIG. 3 is applicable to the first node in the present application.

[0207] As one embodiment, part of the wireless protocol architecture in FIG. 3 is applicable to the second node in the present application.

[0208] As one embodiment, the communication between the first node and the second node only involves the physical layer and the MAC sublayer.

[0209] As one embodiment, the second node only uses the physical layer and the MAC sublayer.

[0210] As one embodiment, the at least one paging message in the present application is generated at the MAC 302 or the PHY 301.

[0211] Embodiment 4

[0212] Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to one embodiment of the present application, as shown in FIG. 4. FIG. 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.

[0213] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, and optionally, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter / receiver 454, and antennas 452.

[0214] The second communication device 410 includes a controller / processor 475, a memory 476, a receive processor 470, a transmit processor 416, and optionally, a multi-antenna receive processor 472, a multi-antenna transmit processor 471, a transmitter / receiver 418, and antennas 420.

[0215] In the transmission from the second communication device 410 to the first communication device 450, upper layer packets from a core network are provided to the controller / processor 475 at the second communication device 410. The controller / processor 475 implements 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, ciphering, 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 retransmission of lost packets, and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the LI layer (i.e., physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, and mapping of coded and modulated symbols onto resource elements (REs) for transmission. The multi-antenna transmit processor 471 performs digital spatial precoding of the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps to each spatial stream to a subcarrier, multiplexes with reference signals (e.g., pilots) in the time and / or frequency domain, and then performs a Fast Fourier Transform (FFT) to produce a time-domain multicarrier symbol stream. The 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 transmit processor 471 into a radio frequency (RF) stream, which is then provided to a respective antenna 420.

[0216] In transmissions 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 respective antenna 452. Each receiver 454 recovers information modulated onto an RF carrier and provides the recovered information at baseband as a stream of symbols to a receive processor 456. The receive processor 456 and a multiple access receiver processor 458 implement various signal processing functions of the Ll layer. The multiple access receiver processor 458 performs receive analog precoding / beamforming operations on the baseband multiple access symbol streams from the receivers 454. The receive processor 456 converts the baseband multiple access symbol streams from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signals and the reference signals are demultiplexed from the received symbol streams by the receive processor 456, with the reference signals to be used for channel estimation and the data signals to be recovered after multiple access detection in the multiple access receiver processor 458 for any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered by the receive processor 456 and used to generate soft decisions. The receive processor 456 then decodes and de-interleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to a controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 can be associated with a memory 460 that stores program codes and data. The memory 460 can be referred to as a computer-readable medium. In transmissions from the second communication device 410 to the second communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the core network. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals can also be provided to the L3 for L3 processing.

[0217] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, a data source 467 is used to provide upper layer data packets to the controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmit function 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, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations for the user plane and control plane. The controller / processor 459 is also responsible for retransmission of lost packets, and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping, channel coding processing, multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, and then the transmit processor 468 modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, which are then provided to different antennas 452 via the transmitters 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency signal, and then provides the radio frequency signal to the antenna 452.

[0218] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the receive functions 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 a radio frequency signal through its respective antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna receive processor 472 and the receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 collectively implement the functions of the L1 layer. The controller / processor 475 implements the functions of the L2 layer. The controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the first communication device 450. The upper layer data packets from the controller / processor 475 can be provided to a core network.

[0219] As one embodiment, the second communication device can support only some of the modules / functions in FIG. 4.

[0220] As one embodiment, the first communication device 450 apparatus comprises at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the first communication device 450 apparatus at least to transmit at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first value identifies the first paging message, whether random access is triggered depending on the first value; wherein whether random access is triggered depending on the first value comprises that random access is triggered only if the second node has not successfully initiated random access for the paging message identified by the first value.

[0221] As one embodiment, the first communication device 450 comprises a memory storing a program of computer readable instructions to produce actions when executed by at least one processor, the actions comprising transmitting at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first value identifies the first paging message, whether random access is triggered depending on the first value; wherein whether random access is triggered depending on the first value comprises that random access is triggered only if the second node has not successfully initiated random access for the paging message identified by the first value.

[0222] As one embodiment, the second communication device 410 apparatus comprises at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the second communication device 410 apparatus at least to receive at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first value identifies the first paging message, whether random access is triggered depending on the first value; wherein whether random access is triggered depending on the first value comprises that random access is triggered only if the second node has not successfully initiated random access for the paging message identified by the first value.

[0223] As an embodiment, the second communication device 410 comprises: a memory storing a computer readable program of instructions which, when executed by at least one processor, causes actions comprising: receiving at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging the second node, wherein a first value identifies the first paging message, whether random access is triggered depending on the first value; wherein whether random access is triggered depending on the first value comprises that random access is triggered only when the second node has not successfully initiated random access for the paging message identified by the first value.

[0224] As an embodiment, the first communication device 450 corresponds to the first node in the present application.

[0225] As an embodiment, the second communication device 410 corresponds to the second node in the present application.

[0226] As an embodiment, the first communication device 450 is a UE.

[0227] As an embodiment, the first communication device 450 is a mobile phone.

[0228] As an embodiment, the second communication device 450 is an AIoT device.

[0229] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used for receiving the first data in the present application.

[0230] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used for receiving the random access preamble in the present application.

[0231] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used for receiving the random access request in the present application.

[0232] As an embodiment, the transmitter 454 (including the antenna 452), the transmitting processor 468 and the controller / processor 459 are used for transmitting the at least one paging message in the present application.

[0233] As an embodiment, the transmitter 454 (including the antenna 452), the transmitting processor 468 and the controller / processor 459 are used for transmitting the first signaling in the present application.

[0234] As an example, the transmitter 454 (including the antenna 452), the transmission processor 468, and the controller / processor 459 are used to send the first acknowledgement message in the present application.

[0235] Embodiment 5

[0236] Embodiment 5 illustrates a flow chart of wireless signal transmission according to an embodiment of the present application, as shown in FIG. 5. In FIG. 5, U01 corresponds to the first node in the present application, and it is specifically stated that the order in this example does not limit the order of signal transmission and implementation in the present application, and the steps within F51 are optional.

[0237] For the first node U01, a first paging message is sent in step S5101; a random access request is received in step S5102; first data is received in step S5103; a first acknowledgement message is sent in step S5104; and a second paging message is sent in step S5105.

[0238] For the second node U02, a first paging message is received in step S5201; a random access request is sent in step S5202; first data is sent in step S5203; a first acknowledgement message is received in step S5204; and a second paging message is received in step S5205.

[0239] In embodiment 5, the first paging message is any one of at least one paging message sent by the first node U01, and the first paging message pages the second node, wherein a first value identifies the first paging message, and whether random access is triggered depends on the first value;

[0240] Wherein whether random access is triggered depends on the first value includes: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0241] As an example, the first node U01 is a UE.

[0242] As an example, the second node U02 is an AIoT device.

[0243] As an example, the communication link between the first node U01 and the second node U02 is not a sidelink.

[0244] As an example, the communication interface between the first node U01 and the second node U02 is not a Uu interface.

[0245] As an example, the second node U02 is not a mobile phone.

[0246] As one embodiment, the second node U02 is not a UE.

[0247] As one embodiment, the order of the steps shown in figure 5 is the chronological order.

[0248] As one embodiment, step S5102 is earlier than step S5101.

[0249] As one sub-embodiment of this embodiment, the second node U02 initiates random access for a paging message identified by the first number that is earlier than the first paging message.

[0250] As one embodiment, step S5102 is later than step S5101.

[0251] As one sub-embodiment of this embodiment, the second node U02 has not successfully initiated random access for a paging message identified by the first number.

[0252] As one embodiment, step S5103 is later than step S5102.

[0253] As one embodiment, step S5104 is later than step S5103.

[0254] As one embodiment, step S5105 is later than step S5104.

[0255] As one embodiment, step S5105 is earlier than step S5101.

[0256] As one sub-embodiment of this embodiment, step S5102 is earlier than step S5101.

[0257] As one sub-embodiment of this embodiment, step S5102 is later than step S5105.

[0258] As one sub-embodiment of this embodiment, step S5102 is initiated for step S5105.

[0259] As one embodiment, the second paging message is one of the at least one paging message.

[0260] As one embodiment, the second paging message is not the first paging message.

[0261] As one embodiment, when step S5201 occurs, the steps within F51 occur if the second node U02 has not successfully initiated random access for a paging message identified by the first number.

[0262] As one embodiment, when step S5201 occurs, if the second node U02 has successfully initiated a random access for the paging message identified by the first number, then the steps within F51 do not occur.

[0263] As one embodiment, initiating the random access comprises sending a signal in a random access procedure.

[0264] As one embodiment, the signal in the random access procedure comprises sending a random access request.

[0265] As one embodiment, the signal in the random access procedure is a signal at the physical layer.

[0266] As one embodiment, the signal in the random access procedure is a preamble signal.

[0267] As one embodiment, initiating the random access can further comprise receiving a response to the random access.

[0268] As one embodiment, the second node U02 can repeat sending the signal in the random access procedure. This can increase the power of the signal.

[0269] As one embodiment, each signal sent by the second node U02 can be accompanied by a signal sent by the first node U01. Since the second node U02 has no amplifier, not even a storage energy, it needs to use the signal from the first node U01 to transmit the signal to be sent.

[0270] As one embodiment, the initiating the random access procedure comprises sending data and / or receiving a response.

[0271] As one embodiment, sending data and / or receiving a response is accompanied by the random access procedure.

[0272] As one sub-embodiment of this embodiment, successfully initiating the random access means successfully completing sending data.

[0273] As one sub-embodiment of this embodiment, successfully initiating the random access means successfully completing receiving a response.

[0274] As one embodiment, the sending data comprises sending the first data.

[0275] As one embodiment, the receiving a response comprises receiving the first acknowledgement message.

[0276] As one embodiment, the first data comprises a physical layer signal. The first data is generated at the physical layer.

[0277] As one embodiment, the first data comprises a signal of a MAC layer. The first data is generated at the MAC layer.

[0278] As one embodiment, within F51, the second node U02 can transmit multiple data, e.g., in addition to the first data, a second data, a third data, etc.

[0279] As one embodiment, the first acknowledgement message is used to acknowledge all data transmitted by the second node U02.

[0280] As one embodiment, the first acknowledgement message indicates the second node U02 to end communication.

[0281] As one embodiment, the first acknowledgement message indicates the second node U02 to start sleeping.

[0282] As one embodiment, the first acknowledgement message acknowledges whether random access is successfully completed.

[0283] As one embodiment, the first data can be optionally encrypted.

[0284] As one embodiment, the first data can be optionally integrity protected.

[0285] As one embodiment, the second node U02 can establish a security context in conjunction with initiating random access.

[0286] As one embodiment, the first data is dependent on the security context.

[0287] As one embodiment, the first paging message is directed to multiple devices.

[0288] As one embodiment, the second paging message is directed to multiple devices.

[0289] As one embodiment, both the first paging message and the second paging message correspond to a first value of an identity.

[0290] As one embodiment, the first value of the identity identifies the second paging message.

[0291] As one embodiment, the second paging message is a copy of the first paging message.

[0292] As one embodiment, the second paging message comprises at least one bit different from the first paging message.

[0293] As one subembodiment of this embodiment, the at least one bit included in the second paging message that is different from the first paging message indicates whether the second paging message is the last one of the at least one paging message.

[0294] As one subembodiment of this embodiment, the at least one bit included in the second paging message that is different from the first paging message indicates whether the second paging message is the first one of the at least one paging message.

[0295] As one subembodiment of this embodiment, the at least one bit included in the second paging message that is different from the first paging message indicates whether the second paging message is the first one of the at least one paging message.

[0296] As one subembodiment of this embodiment, the at least one bit included in the second paging message that is different from the first paging message indicates whether the second paging message is a primary paging message or an additional paging message.

[0297] As one embodiment, the paging object targeted by the first paging message and the second paging message is the same.

[0298] As one embodiment, the paging object targeted by the second paging message is a subset of the paging object targeted by the first paging message.

[0299] As one subembodiment of this embodiment, the subset is a proper subset.

[0300] As one embodiment, the benefit of having at least one bit different between the first paging message and the second paging message is that it is more flexible.

[0301] As one embodiment, the first node U01, in conjunction with step S5103, can send a command or data to the second node U02.

[0302] As one embodiment, regardless of the order of the first paging message and the second paging message, the second node U02 only needs to successfully initiate random access once.

[0303] As a first subembodiment of this embodiment, the benefit of the above method includes saving power and reducing collisions.

[0304] As one embodiment, the first paging message is not targeted at other UEs.

[0305] As one embodiment, the at least one paging message is not targeted at other UEs.

[0306] As an embodiment, the first node U01 can send a wake-up signal, or a signal for charging the second node U02, before sending the at least one paging message.

[0307] Embodiment 6

[0308] Embodiment 6 illustrates a diagram of at least one paging message according to an embodiment of the present application, as shown in FIG. 6.

[0309] Each grey block in FIG. 6 represents a paging message, and the grey blocks are of the same size, but the method proposed in the present application does not require that each of the at least one paging message is the same.

[0310] As an embodiment, the at least one paging message comprises at least one paging message in FIG. 6.

[0311] As an embodiment, any two of the at least one paging message do not overlap in time domain.

[0312] As an embodiment, the at least one paging message is periodically sent.

[0313] As an embodiment, the at least one paging message does not require to be periodically sent.

[0314] As an embodiment, the at least one paging message only comprises the first paging message.

[0315] Typically, the at least one paging message comprises a plurality of paging messages.

[0316] As an embodiment, any of the at least one paging message is identified by a first value.

[0317] As an embodiment, the first value corresponds to one of a1, a2, a3, a4, a5 in FIG. 6.

[0318] As an embodiment, a1, a2, a3, a4, a5 in FIG. 6 are all different.

[0319] As a sub-embodiment of this embodiment, the at least one paging message only comprises the first paging message.

[0320] As an embodiment, a1 in FIG. 6 is equal to a2, and the at least one paging message comprises the paging message corresponding to a1 and the paging message corresponding to a2.

[0321] As a sub-embodiment of this embodiment, a1 is not equal to a3; a1 is not equal to a4; a1 is not equal to a5.

[0322] As one embodiment, a1=a2=a3=a4=a5 in FIG. 6.

[0323] As one sub-embodiment of this embodiment, the at least one paging message comprises all the paging messages in FIG. 6.

[0324] As one embodiment, the at least one paging message is in a time sequence.

[0325] As one embodiment, the second node can receive all the paging messages in the at least one paging message.

[0326] As one embodiment, the second node can receive part of the paging messages in the at least one paging message.

[0327] As one sub-embodiment of this embodiment, the second node only receives part of the at least one paging message, for example, when the channel quality is poor.

[0328] Embodiment 7

[0329] Embodiment 7 illustrates a schematic diagram of the at least one paging message according to one embodiment of the present application, as shown in FIG. 7.

[0330] Each gray square in FIG. 7 represents a paging message, and although the gray squares are of the same size, the method proposed in the present application does not require that each paging message in the at least one paging message is the same.

[0331] As one embodiment, a1 in FIG. 7 is not equal to a2.

[0332] As one embodiment, the at least one paging message comprises two paging messages corresponding to a2 in FIG. 7.

[0333] As one sub-embodiment of this embodiment, the first number is equal to a2.

[0334] As one embodiment, the at least one paging message comprises three paging messages corresponding to a1 in FIG. 7.

[0335] As one sub-embodiment of this embodiment, the first number is equal to a1.

[0336] As one embodiment, the first number only comprises one bit.

[0337] As one embodiment, the first number is either equal to 0 or equal to 1.

[0338] As one embodiment, all the paging messages in the time period occupied by the at least one paging message belong to the at least one paging message.

[0339] As an embodiment, the information that can be used to distinguish the paging message is an identity of the paging message.

[0340] As an embodiment, any of the at least one paging message comprises the first value.

[0341] As an embodiment, a signal before the at least one paging message indicates the first value.

[0342] As an embodiment, a signal before any of the at least one paging message respectively indicates the first value.

[0343] Embodiment 8

[0344] Embodiment 8 illustrates a diagram of the first time window according to an embodiment of the present application, as shown in FIG. 8.

[0345] As an embodiment, FIG. 8 shows that there are 3 paging messages in the first time window, and the 3 paging messages are the at least one paging message, and the present application does not limit the number of paging messages in the first time window.

[0346] As an embodiment, the paging messages in the first time window belong to the at least one paging message.

[0347] As an embodiment, the at least one paging message all belong to the first time window.

[0348] As an embodiment, the first value is equal to a1.

[0349] As an embodiment, the paging message corresponding to a1 in FIG. 8 is the only paging message in the first time window that belongs to the at least one paging message.

[0350] As an embodiment, the first value identifies 5 paging messages in FIG. 8.

[0351] As an embodiment, the first value can identify paging messages other than the at least one paging message.

[0352] As an embodiment, the first time window and the first value are used together to determine or identify the at least one paging message.

[0353] As an embodiment, the first time window and the first value and the identity of the first node are used together to determine or identify the at least one paging message.

[0354] As a sub-embodiment of this embodiment, the first time window and the first number and the identity of the first node together being used to determine or identify the at least one paging message means that the first time window and the first number and the identity of the first node together are used to identify the at least one paging message used to determine or identify the paging message sent out by the first node.

[0355] As an embodiment, the random access is triggered only when the second node does not successfully initiate random access for the paging message identified by the first number, which is true only for the paging message within the first time window.

[0356] As an embodiment, the random access is triggered only when the second node does not successfully initiate random access for the paging message identified by the first number in the at least one paging message, which refers to a paging message in the at least one paging message.

[0357] As an embodiment, even if the second node successfully initiates random access for the paging message outside the first time window, it does not affect the second node initiating random access for the paging message within the first time window.

[0358] As a sub-embodiment of this embodiment, the does not affect means that the second node still responds to the paging message within the first time window, including initiating random access.

[0359] As an embodiment, the first time window is indicated by the first paging message.

[0360] As an embodiment, the first time window is fixed.

[0361] As an embodiment, the first time window depends on the type of paging.

[0362] As an embodiment, the first time window depends on the service supported by the second node.

[0363] As an embodiment, the first time window is indicated by the at least one paging message.

[0364] As an embodiment, the first time window is indicated by the signal before the at least one paging message.

[0365] As an embodiment, the signal before the at least one paging message is used to wake up the second node.

[0366] As an embodiment, the signal before the at least one paging message is used to provide energy to the second node.

[0367] As an embodiment, the first time window is finite.

[0368] As an embodiment, the length of the first time window depends on receiving K paging messages.

[0369] As an embodiment, the length of the first time window is receiving X square waves or impacts.

[0370] As an embodiment, the first time window can be implemented by a timer.

[0371] As an embodiment, upon receiving a first type of signal, the second node starts or restarts a time period, which belongs to the first time window.

[0372] As an embodiment, the first time window only includes one time period.

[0373] As an embodiment, the first time window is composed of at least one time period.

[0374] As an embodiment, the first type of signal is a physical layer signal.

[0375] As an embodiment, the first node sends the first type of signal.

[0376] As an embodiment, the first type of signal is used for waking up a device or an AIoT device.

[0377] As an embodiment, the first type of signal is used to provide energy for the second node.

[0378] As an embodiment, the first type of signal includes at least one of a preamble, a midamble.

[0379] As an embodiment, the first time window corresponds to one wake-up of the second node. Each time the second node wakes up, there is only one time window.

[0380] As an embodiment, the end time of the first time window is the time when the second node starts to sleep.

[0381] As an embodiment, the end time of the first time window is the time when the second node confirms the successful initiation of random access.

[0382] Embodiment 9

[0383] Embodiment 9 illustrates a schematic diagram of a first paging message according to an embodiment of the present application, as shown in FIG. 9.

[0384] As an example, the different colored squares in Figure 9 represent different paging messages, different paging message segments, or different paging sub-messages.

[0385] As an example, the different colored squares in Figure 9 represent a first-type signal and a paging message.

[0386] As one embodiment, the first paging message may include multiple segments.

[0387] As one embodiment, the first paging message may include a main paging sub-message and an additional paging sub-message.

[0388] As an example, a square in Figure 9 represents the first paging message.

[0389] As an example, the two signals shown in Figure 9 may be continuous or discontinuous in time.

[0390] As one embodiment, the first paging message is an additional paging message.

[0391] As one embodiment, the first value is indicated by an additional paging message.

[0392] As an example, the earlier signal sent in Figure 9 is used to page or wake up the first group of devices, and the later signal sent in Figure 9 is used to page or wake up the second group of devices.

[0393] As a sub-example of this embodiment, Figure 9 illustrates the at least one paging message.

[0394] As a sub-implementation of this embodiment, the at least one paging message includes two paging messages, which correspond to the two blocks in Figure 9 respectively.

[0395] As one embodiment, the second group of devices is a subset of the first group of devices.

[0396] As a sub-implementation of this embodiment, the subset is a proper subset.

[0397] As an example, the first group of devices includes all devices that received the earlier transmitted signal.

[0398] As an example, the advantages of the above method are reduced complexity, improved paging success rate, improved coverage, and improved scalability.

[0399] Example 10

[0400] Example 10 illustrates a schematic diagram of a first air interface according to an embodiment of this application, as shown in Figure 10.

[0401] Figure 10 illustrates one communication scenario targeted by the present application, in which the network node comprises a base station and / or a core network, the first node is a UE, the second node is a device, and the third node is also a device, and the method proposed by the present application supports more devices.

[0402] As one embodiment, the second node and the third node are the same type of device.

[0403] As one embodiment, the second node and the third node are devices running the same service.

[0404] As one embodiment, the first node pages the second node and the third node through the at least one paging message.

[0405] As one embodiment, the first node pages the second node and the third node through the first paging message.

[0406] As one embodiment, the communication interface between the second node and the first node is a first air interface.

[0407] As one embodiment, the communication interface between the third node and the first node is a first air interface.

[0408] As one embodiment, the first air interface is not a Uu interface.

[0409] As one embodiment, the first air interface is not a sidelink interface.

[0410] As one embodiment, the second node is a passive node.

[0411] As one embodiment, the communication interface between the first node and the network node is a Uu interface.

[0412] As one embodiment, the first node is not an IAB (integrated access backhaul) device.

[0413] As one embodiment, the at least one paging message is sent through the first air interface.

[0414] As one embodiment, the first data is sent through the first air interface.

[0415] As one embodiment, the first acknowledgement message is sent through the first air interface.

[0416] As one embodiment, the initiating random access is random access for the first node.

[0417] As one embodiment, the initiating random access is not for network random access.

[0418] As one embodiment, the at least one paging message can be triggered by a network node.

[0419] As one embodiment, the protocol structure over the first air interface does not include a PDCP sublayer.

[0420] As one embodiment, the protocol structure over the first air interface does not include an RRC sublayer.

[0421] As one embodiment, the protocol structure over the first air interface does not include an RLC sublayer.

[0422] As one embodiment, the protocol structure over the first air interface does not include an SDAP sublayer.

[0423] As one embodiment, the first air interface is an interface between a reader and an AIoT device.

[0424] As one embodiment, the first node is a reader.

[0425] Embodiment 11

[0426] Embodiment 11 illustrates a structural block diagram of a processing apparatus in a first node according to one embodiment of the present application; as shown in FIG. 11. In FIG. 11, the processing apparatus 1100 in the first node includes a first receiver 1101, a first transmitter 1102, and a first processor 1103.

[0427] In embodiment 11, the first transmitter 1102 transmits at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first value identifies the first paging message, whether random access is triggered depends on the first value.

[0428] Wherein whether random access is triggered depends on the first value includes: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0429] As one embodiment, the first value is used to determine whether to initiate random access includes: when the second node successfully initiates random access for the paging message identified by the first value, the second node gives up initiating random access.

[0430] As one embodiment, the first paging message triggers the second node to initiate random access only when the second node fails to successfully initiate random access for a paging message identified by the first number value, only within a first time window;

[0431] wherein a length of the first time window is finite.

[0432] As one embodiment, the paging messages identified by the first number value are all transmitted by the first node.

[0433] As one embodiment, the successfully initiating random access comprises successfully completing transmission of data.

[0434] As one embodiment, the first paging message indicates that the first number value is used to determine whether the initiation of random access is valid.

[0435] As one embodiment, the first paging message comprises the first number value.

[0436] As one embodiment, the first transmitter 1102, along with the first paging message, transmits a first signal, the first signal indicating the first number value.

[0437] As one embodiment, the first signal belongs to the first type of signal.

[0438] As one embodiment, the first signal is an additional paging message, or a segment of a paging message.

[0439] As one embodiment, the first node is a user equipment (UE).

[0440] As one embodiment, the first node is a terminal supporting large latency difference.

[0441] As one embodiment, the first node is a terminal supporting NTN.

[0442] As one embodiment, the first node is an aerial vehicle.

[0443] As one embodiment, the first node is a vehicle-mounted terminal.

[0444] As one embodiment, the first node is a mobile phone.

[0445] As one embodiment, the first node is a ship.

[0446] As one embodiment, the first node is an Internet of Things terminal.

[0447] As one embodiment, the first node is an industrial Internet of Things terminal.

[0448] As one embodiment, the first receiver 1101 includes at least one of the antenna 452, the receiver 454, the receive processor 456, the multi-antenna receive processor 458, the controller / processor 459, the memory 460, or the data source 467 in embodiment 4.

[0449] As one embodiment, the first transmitter 1102 includes at least one of the antenna 452, the transmitter 454, the transmit processor 468, the multi-antenna transmit processor 457, the controller / processor 459, the memory 460, or the data source 467 in embodiment 4.

[0450] Embodiment 12

[0451] Embodiment 12 illustrates a structural block diagram of a processing apparatus in a second node according to an embodiment of the application; as shown in FIG. 12. In FIG. 12, the processing apparatus 1200 in the second node includes a second receiver 1201, a second transmitter 1202, and a second processor 1203.

[0452] In embodiment 12, the second receiver 1202 receives at least one paging message, a first paging message is any one of the at least one paging message, the first paging message pages the second node, wherein a first value identifies the first paging message, whether random access is triggered depends on the first value;

[0453] Wherein whether random access is triggered depends on the first value includes: only when the second node does not successfully initiate random access for the paging message identified by the first value, random access is triggered.

[0454] As one embodiment, the first value is used to determine whether to initiate random access includes: when the second node successfully initiates random access for the paging message identified by the first value, the second node gives up initiating random access.

[0455] As one embodiment, the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging message identified by the first value, which is only valid within a first time window;

[0456] Wherein the length of the first time window is limited.

[0457] As one embodiment, the paging message identified by the first value is all sent by the first node.

[0458] As one embodiment, the successful initiation of random access includes successfully completing the transmission of data.

[0459] As one embodiment, the first paging message indicates that the first value is used to determine whether to initiate random access is effective.

[0460] As one embodiment, the first paging message includes the first value.

[0461] As one embodiment, a first signal is received with the first paging message, the first signal indicating the first value.

[0462] As one embodiment, a first type of signal includes the first signal.

[0463] As one embodiment, the first signal is an additional paging message, or a segment of a paging message.

[0464] As one embodiment, the first node is a device.

[0465] As one embodiment, the first node is an IoT device.

[0466] As one embodiment, the first node is an A-IoT device.

[0467] As one embodiment, the first receiver 1201 includes at least one of the antenna 452, the receiver 454, the receive processor 456, the multiple antenna receive processor 458, the controller / processor 459, the memory 460, or the data source 467 in embodiment 4.

[0468] As one embodiment, the first transmitter 1202 includes at least one of the antenna 452, the transmitter 454, the transmit processor 468, the multiple antenna transmit processor 457, the controller / processor 459, the memory 460, or the data source 467 in embodiment 4.

[0469] Embodiment 13

[0470] Embodiment 13 illustrates a diagram of the structure of an A-IoT device according to one embodiment of the application, as shown in FIG. xx.

[0471] In FIG. XX, the A-IoT device 1400 includes an antenna 1401, energy related blocks 1404, processing related blocks 1408. The A-IoT device 1400 can also include a matching network 1402, which is used to match the impedance between the antenna 1401 and other components, including a radio frequency (RF) energy harvester 1403 and reception related blocks 1409. The A-IoT device 1400 can also include an energy harvester, which can be a RF energy harvester 1403 or a non-RF energy harvester 1407. The RF energy harvester 1403 can include a rectifier to perform RF signal (AC) to DC conversion. The RF energy harvester 1403 and the receiver / transmitter can share the antenna 1401, or they can use independent antennas. The energy related blocks 1404 can include a power management unit (PMU) 1405, which is responsible for storing the energy from the energy harvester to an energy storage 1406, and providing power to active component blocks that need power. The energy related blocks 1404 can also include an energy storage 1406, which stores the energy collected from the energy harvester, and the energy storage 1406 can be a capacitor. The processing related blocks 1408 can include BB (Base Band) logic 1413, memory 1418, and a clock generator 1419. The BB logic 1413 can include a decoder 1414, a controller 1415, and an encoder 1416. The memory 1418 can include two types, one is a non-volatile memory (NVM), such as an EEPROM, which is used to store the device ID permanently, and the other is a register, which is used to temporarily save information that is only needed temporarily for operation when the energy in the energy storage 1406 is available. The clock generator 1419 provides the required clock signal. The processing related blocks 1408 can also include reception related blocks 1409 and transmission related blocks 1417, which can include different blocks for different A-IoT devices.

[0472] As an example, for an A-IoT device 1400 with peak power consumption of about 1 μW, the receive related module 1409 can include an RF BPF 1410, a radio frequency envelope detector (RF-ED), a BB LPF 1411, and a comparator 1412. The transmit related module 1417 can include a backscatter modulator.

[0473] As a non-limiting example, the output of the matching network 1402 is processed by the RF BPF 1410, the radio frequency envelope detector, the BB LPF 1411, and the comparator 1412 in sequence before being input to the BB logic 1413. The output of the BB logic 1413 is processed by the backscatter modulator before being transmitted by the antenna 1401.

[0474] As an example, for an A-IoT device 1400 with peak power consumption of less than or equal to a few hundred μW, if an external carrier wave is used, the receive related module 1409 can include an RF BPF 1410, an LNA (Low-noise amplifier), a radio frequency envelope detector, a BB amplifier, a BB LPF 1411, and a comparator / N-bit ADC 1412. The transmit related module 1417 can include a large frequency shifter (e.g., tens of megahertz), a backscatter modulator, and a reflection amplifier. At least one of R2D (Reader to device) / CW2D (Carrier-wave, or carrier-wave node, to device) and D2R (Device to reader) can be amplified by the reflection amplifier or the LNA. The large frequency shifter shifts the backscatter signal from one frequency (e.g., FDD-DL frequency) to another frequency (e.g., FDD-UL frequency).

[0475] As a non-limiting example, the output of the matching network 1402 is processed by the RF BPF 1410, the LNA, the radio frequency envelope detector, the BB amplifier, the BB LPF 1411, and the comparator / N-bit ADC 1412 in sequence before being input to the BB logic 1413. The output of the BB logic 1413 is processed by the large frequency shifter, the backscatter modulator, and the reflection amplifier before being transmitted by the antenna 1401.

[0476] As an embodiment, for A-IoT device 1400 with peak power consumption less than or equal to a few hundred μW, if internally-generated carrier wave is employed and a RF envelope detector receiver is employed, the receive related module 1409 can include a RF BPF 1410, a LNA, a RF envelope detector, a BB amplifier, a BB LPF 1411, a comparator / N-bit ADC 1412. The transmit related module 1417 can include a Tx Modulator, a Digital to Analog Converter (DAC), a Lowpass filter, a mixer, a LO ( / PLL) and a Power amplifier (PA).

[0477] As a non-limiting embodiment, the output of the matching network 1402 is input to the BB logic 1413 after being processed by a RF BPF 1410, a LNA, a RF envelope detector, a BB amplifier, a BB LPF 1411, a comparator / N-bit ADC 1412 in sequence. The output of the BB logic 1413 is transmitted by the antenna 1401 after being processed by a Tx Modulator, a Digital to Analog Converter (DAC), a Lowpass filter, a mixer, a LO ( / PLL) and a Power amplifier (PA).

[0478] As an example, for A-IoT device 1400 with peak power consumption less than or equal to a few hundred μW, if internally-generated carrier wave is employed and an intermediate frequency envelope detector receiver (IF envelope detector receiver) is employed, the receive related module 1409 can include an RF BPF 1410, an LNA, a mixer, an intermediate frequency amplifier (IF amplifier), an intermediate frequency filter (IF filter), an intermediate frequency envelope detector (IF envelope detector, IF-ED), a BB amplifier, a BB LPF 1411, a comparator / N-bit ADC 1412. The transmit related module 1417 can include a transmit modulator, a digital-to-analog converter, a low pass filter, a mixer, a LO / FLL ( / PLL), and a power amplifier. The intermediate frequency amplifier amplifies the intermediate frequency signal. The intermediate frequency filter filters unwanted radio frequency and LO signals. The intermediate frequency envelope detector detects the envelope from the intermediate frequency signal. The mixer in the receive related module 1409 down-converts the radio frequency signal to an intermediate frequency stage (IF stage). There can be one or two mixers for the transmit side and the receive side based on implementation.

[0479] As an example, for A-IoT device 1400 with peak power consumption less than or equal to a few hundred μW, if internally-generated carrier wave is employed and an intermediate frequency envelope detector receiver (IF envelope detector receiver) is employed, the receive related module 1409 can include an RF BPF 1410, an LNA, a mixer, an intermediate frequency amplifier (IF amplifier), an intermediate frequency filter (IF filter), an intermediate frequency envelope detector (IF envelope detector, IF-ED), a BB amplifier, a BB LPF 1411, a comparator / N-bit ADC 1412. The transmit related module 1417 can include a transmit modulator, a digital-to-analog converter, a low pass filter, a mixer, a LO / FLL ( / PLL), and a power amplifier. The intermediate frequency amplifier amplifies the intermediate frequency signal. The intermediate frequency filter filters unwanted radio frequency and LO signals. The intermediate frequency envelope detector detects the envelope from the intermediate frequency signal. The mixer in the receive related module 1409 down-converts the radio frequency signal to an intermediate frequency stage (IF stage). There can be one or two mixers for the transmit side and the receive side based on implementation.

[0480] As an example, for A-IoT device 1400 with peak power consumption less than or equal to a few hundred μW, if internally-generated carrier wave is employed and an intermediate frequency envelope detector receiver (IF envelope detector receiver) is employed, the receive related module 1409 can include an RF BPF 1410, an LNA, a mixer, an intermediate frequency amplifier (IF amplifier), an intermediate frequency filter (IF filter), an intermediate frequency envelope detector (IF envelope detector, IF-ED), a BB amplifier, a BB LPF 1411, a comparator / N-bit ADC 1412. The transmit related module 1417 can include a transmit modulator, a digital-to-analog converter, a low pass filter, a mixer, a LO / FLL ( / PLL), and a power amplifier. The intermediate frequency amplifier amplifies the intermediate frequency signal. The intermediate frequency filter filters unwanted radio frequency and LO signals. The intermediate frequency envelope detector detects the envelope from the intermediate frequency signal. The mixer in the receive related module 1409 down-converts the radio frequency signal to an intermediate frequency stage (IF stage). There can be one or two mixers for the transmit side and the receive side based on implementation.

[0481] As a non-limiting example, the output of the matching network 1402 is processed by the RF BPF 1410, LNA, mixer, BB amplifier, BB LPF 1411, comparator / N-bit ADC 1412 in sequence, and then input to the BB logic 1413. The output of the BB logic 1413 is processed by the transmit modulator, digital-to-analog converter, low pass filter, mixer, LO / FLL( / PLL), and power amplifier, and then transmitted by the antenna 1401.

[0482] In some embodiments described above, the RF BPF 1410 is used to enhance selectivity. Based on implementation, the RF BPF 1410 can not exist. The BB LPF 1411 is used to filter out harmonics and high frequency components, and improve the input signal quality of the comparator / ADC 1412. Based on implementation, the BB LPF 1411 can not exist. The comparator 1412 is used to detect the high / low of the input signal. The backscatter modulator is used to convert the impedance into a modulated backscatter signal carrying the transmit signal from the BB logic 1413. The LNA is used to improve the signal strength and receive sensitivity. The radio frequency envelope detector is used to detect the envelope from the radio frequency signal. The BB amplifier is used to amplify the signal to improve the signal strength. The transmit modulator is used to modulate the baseband bits according to the modulation method; the transmit modulator can be part of the BB logic 1413. The digital-to-analog converter is used to convert the digital signal to an analog signal. The low pass filter is used to filter out unwanted signals. The mixer in the transmit-related module 1417 is used to up-convert the baseband signal to the radio frequency range. The LO is used to generate the carrier frequency; the FLL( / PLL) can be used for frequency synthesis, and based on implementation, the FLL( / PLL) can not exist. The power amplifier is used to amplify the transmit signal.

[0483] It is particularly pointed out that the structure of the A-IoT device in this example does not limit the specific implementation form of the A-IoT in this application. Specifically, according to the different functions of the A-IoT device and the actual application scenarios, the A-IoT device can adopt the structure of the A-IoT device in this example, can include only part of the modules in the structure of the A-IoT device in this example, and can also include other modules not shown in the accompanying drawings xx.

[0484] Those skilled in the art can understand that all or part of the steps in the foregoing method can be instructed by programs to the relevant hardware, and the programs can be stored in a computer readable storage medium, such as a read-only memory, a hard disk, an optical disk or the like. Alternatively, all or part of the steps of the foregoing embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the foregoing embodiments can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of combination of software and hardware. The user equipment, terminal and UE in the present application include but are not limited to unmanned aerial vehicles, communication modules on unmanned aerial vehicles, remote control aircraft, aircraft, small aircraft, mobile phones, tablet computers, notebooks, vehicle-mounted communication devices, wireless sensors, network cards, Internet of Things terminals, RFID terminals, NB-IoT terminals, MTC (Machine Type Communication) terminals, eMTC (enhanced MTC) terminals, data cards, network cards, vehicle-mounted communication devices, low-cost mobile phones, low-cost tablet computers, satellite communication devices, ship communication devices, NTN user equipment and the like wireless communication devices. The base station or system equipment in the present application includes but is not limited to macro cellular base stations, micro cellular base stations, home base stations, relay base stations, gNB (NR NodeB) NR NodeB, TRP (Transmitter Receiver Point), NTN base station, satellite equipment, flight platform equipment and the like wireless communication devices.

[0485] The present application can be implemented in other specified forms without departing from the core or essential characteristics thereof. Therefore, the presently disclosed embodiments should in no way be considered as descriptive rather than limiting. The scope of the application is determined by the appended claims rather than the preceding description, and all modifications within the equivalent meaning and range of the claims are considered to be included therein.

Claims

1. A method in a first node used for wireless communication, wherein, comprising: sending at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first number identifies the first paging message, whether random access is triggered depending on the first number; wherein whether random access is triggered depending on the first number comprises that random access is triggered only when the second node does not successfully initiate random access for the paging message identified by the first number.

2. The method in the first node according to claim 1, wherein the first number being used to determine whether to initiate random access comprises that the second node gives up initiating random access when the second node successfully initiates random access for the paging message identified by the first number.

3. The method in the first node according to claim 1 or 2, wherein the first paging message triggers the second node to initiate random access only when the second node does not successfully initiate random access for the paging message identified by the first number, which is true only within a first time window; wherein the length of the first time window is limited.

4. The method in the first node according to any one of claims 1 to 3, wherein the paging messages identified by the first number are all sent by the first node.

5. The method in the first node according to any one of claims 1 to 4, wherein the successfully initiating random access comprises successfully completing transmission of data.

6. The method in the first node according to any one of claims 1 to 5, wherein the first paging message indicates whether the first number being used to determine whether to initiate random access is valid.

7. The method in the first node according to any one of claims 1 to 6, wherein the first paging message comprises the first number.

8. A method used in a second node for wireless communication, wherein, comprising: receiving at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first number identifies the first paging message, whether random access is triggered depending on the first number; wherein whether random access is triggered depending on the first number comprises that random access is triggered only when the second node does not successfully initiate random access for the paging message identified by the first number.

9. A first node for wireless communication, wherein, comprising: a first transmitter, sending at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging a second node, wherein a first number identifies the first paging message, whether random access is triggered depending on the first number; wherein whether random access is triggered depending on the first number comprises that random access is triggered only when the second node does not successfully initiate random access for the paging message identified by the first number.

10. A second node for wireless communication, wherein, comprising: a second receiver configured to receive at least one paging message, a first paging message being any one of the at least one paging message, the first paging message paging the second node, wherein a first value identifies the first paging message, whether random access is triggered depending on the first value; wherein whether random access is triggered depending on the first value comprises that random access is triggered only if the second node has not successfully initiated random access for the paging message identified by the first value.

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