CN115968001A

CN115968001A - Method and device used in wireless communication

Info

Publication number: CN115968001A
Application number: CN202111192527.5A
Authority: CN
Inventors: 张锦芳; 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2023-04-14

Abstract

A method and apparatus used in wireless communications is disclosed. A first node receiving a first message and a second message from an air interface; transmitting a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; starting a first timer accompanying transmission of the first MAC SDU when the first message is used to determine that the first timer is started accompanying transmission of the first MAC SDU, the first timer being started after a first time length is delayed after transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first time length is delayed after transmission of the first MAC SDU; wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU. The application effectively supports multicast transmission.

Description

Method and device used in wireless communication

Technical Field

The present application relates to a method and apparatus used in a wireless communication system, and more particularly, to a method and apparatus when supporting multicast transmission in wireless communication.

Background

Although multicast/broadcast (multicast/broadcast) transmission characteristics are not supported in the earliest versions of 5G (file Generation), i.e., version 15 and version 16, in many important application scenarios, such as public safety (public safety) and emergency tasks (mission critical), V2X (Vehicle-to-event) applications, software delivery (software delivery) and group communications (group communications), etc., the one-to-many transmission characteristics of multicast/broadcast communications can significantly improve system performance and user experience.

To support multicast/broadcast communications, 5G broadcast evolution is discussed between 3GPP (3 rd generation partnership project) RAN (Radio access network) #78 congress and RAN #80 congress, summarizing two technical features, one being terrestrial broadcast and the other being mixed-mode multicast. Terrestrial broadcasting only includes a transmission mode of broadcast transmission, and wide-range coverage is realized by a high-power overhead transmission tower only for a downlink. The architecture evolution research project (SI, study Item) of 5G broadcast services gets a pass at SA (Service and systems accessories) #85 meetings, where target a is a use case (use cases) that enables MBS (multicast/broadcast services) and enables identification in 5GS (5G system ). In order to support reliable MBS service transmission, research on MBS service transmission in a RRC (Radio Resource Control) connected state is also in progress.

Disclosure of Invention

The inventor finds, through research, that in Uu air interface transmission, a User Equipment (UE) is generally configured with a data inactivity timer for implementing a data inactivity monitoring function, and if no data is received or sent within a preset time, an established radio connection may be released, so that the UE enters an RRC idle state, and a beneficial effect of power saving is obtained. When an MBS service arrives, aiming at a plurality of UEs in an RRC Idle (RRC _ Idle) state or an RRC Inactive (RRC _ Inactive) state, a base station pages the UEs one by one at Paging Occasions (POs) set for the UEs so that the UEs initiate a random access process to enter an RRC Connected (RRC _ Connected) state to receive the MBS service. For a scenario that more UEs receive MBS services, due to different paging occasions of each UE, and due to possible paging failure and contention in the random access process, a UE that enters an RRC connection state early may have a long waiting time before the MBS services are delivered, and if the waiting time exceeds a preset time, the UE may enter an RRC idle state, so that a base station needs to re-page and/or the UE re-initiates a random access process, which wastes air interface resources on one hand, and on the other hand, the UE may miss receiving a part of MBS services.

The application discloses a solution for realizing an effective data inactivity monitoring function by controlling a data inactivity timer when a UE enters an RRC connected state to receive multicast transmission. When the UE determines that the reason for establishing/recovering the RRC connection is to receive the MBS service, the UE waits for a time length to start the data inactivity timer after entering the RRC connection state, so that the multicast transmission in the RRC connection state can be effectively supported, and the UE is prevented from entering the RRC idle state due to no data receiving and sending within a period of time after starting the data inactivity monitoring. Although the application was originally intended for the Uu air interface, the application can also be used for the PC5 air interface. Furthermore, the adoption of a unified solution for different scenarios (including but not limited to downlink communication scenarios, NR (New Radio, new air interface) V2X scenarios, etc.) also helps to reduce hardware complexity and cost. Without conflict, embodiments and features in embodiments in a first node of the present application may apply to any other node and vice versa. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict. In particular, the terms (telematics), nouns, functions, variables in the present application may be explained (if not specifically stated) with reference to the definitions in the 3GPP specification protocols TS36 series, TS38 series, TS37 series.

The application discloses a method in a first node used for wireless communication, characterized by comprising:

receiving a first message and a second message from an air interface;

transmitting a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length;

wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

As an example, the present application is primarily applicable to the Uu air interface.

As an embodiment, the present application is applicable to a scenario in which a UE enters an RRC connected state from an RRC idle state or an RRC inactive state to receive a multicast service.

As an embodiment, the present application is applicable to transmission in a serving cell (serving cell).

As an embodiment, the present application is applicable to a scenario in which a base station pages a UE through a conventional PO (Paging Occasion) for multicast service transmission.

As an embodiment, different UEs have different POs and enter the RRC connected state at different times.

As an embodiment, the problem to be solved by the present application is: in multicast transmission, one-time transmission can be received by a plurality of UEs, and the multicast service can effectively save the spectrum efficiency through multicast transmission; for the UE in an RRC idle state or an RRC inactive state, the base station enables the UE to enter an RRC connected state through paging; because different UEs have different POs and at the same time, because of contention in the random access process, the time for the UE to enter the RRC connection state is different, and the base station generally waits for all or most of the UEs to enter the RRC connection state before starting to send the multicast service; if a first MAC (media access Control) SDU (Service Data Unit) is transmitted or received after entering the RRC connected state, a first timer is started, since the first MAC SDU generally includes RRC signaling instead of multicast Service Data, if it needs to wait for a long time to start multicast Data transmission after the first MAC SDU, the first timer may be caused to expire and enter an RRC idle state, which affects multicast Service reception.

As an example, the solution of the present application comprises: and for the multicast service, indicating a first time length through a paging message, and starting the first timer after the UE transmits the first MAC SDU and then passes the first time length.

As an embodiment, the beneficial effects of the present application include: the method can effectively support the multicast transmission in the RRC connection state, avoid the phenomenon that the UE enters the RRC idle state due to no data receiving and sending within a period of time after the first timer is started, influence on multicast service receiving and waste of spectrum resources due to the fact that the UE needs to be paged again to enter the RRC connection state.

As an embodiment, the first message is used to trigger the first node to transition an RRC state; wherein the RRC states include an RRC connected state, an RRC idle state, and an RRC inactive state; the first node is in one of an RRC idle state or an RRC inactive state when receiving the first message.

As an embodiment, the first node has no activated multicast session when receiving the first message.

As an embodiment, the first message is used to trigger the first node to transition from the RRC idle state to an RRC connected state when the first node is in an RRC idle state.

As an embodiment, the first message is used to trigger the first node to transition from the RRC inactive state to an RRC connected state when the first node is in an RRC inactive state.

As one embodiment, the first timer is used for data inactivity monitoring.

As an embodiment, after the first timer expires, the first node enters an RRC idle state.

In an embodiment, when the first timer is in a running state, the first node is in an RRC connected state.

According to one aspect of the application, comprising:

after sending the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node receives a MAC SDU; after transmitting the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node transmits one MAC SDU;

wherein the MAC SDU belongs to a first logical channel set.

According to one aspect of the application, comprising:

when the first message indicates the first length of time, the first message is used to determine to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

According to one aspect of the application, comprising:

the first message includes a first set of identities indicating at least one of a first MBS session or a first node;

wherein, the time when the first node receives the MAC SDU belonging to the first MBS session is not earlier than the sending time of the first MAC SDU and is delayed by the first time length.

According to one aspect of the application, comprising:

receiving the first message through a second logical channel, the second logical channel not belonging to the first set of logical channels.

According to one aspect of the application, comprising:

the first node enters an RRC idle state when the first timer expires.

According to one aspect of the application, comprising:

the first message is used to trigger a random access procedure to which the second message belongs.

The present application discloses a first node for wireless communication, comprising:

a first receiver that receives a first message and a second message from an air interface;

a first transmitter to transmit a first MAC SDU, the first MAC SDU comprising a third message, the third message used in response to the second message; starting a first timer accompanying transmission of the first MAC SDU when the first message is used to determine that the first timer is started accompanying transmission of the first MAC SDU, the first timer being started after a first time length is delayed after transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first time length is delayed after transmission of the first MAC SDU;

The application discloses a method in a second node used for wireless communication, which is characterized by comprising the following steps:

transmitting the first message and the second message from the air interface;

receiving a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message;

wherein the first message is used to determine whether to start a first timer with transmission of the first MAC SDU or to start the first timer after a delay of a first length of time following transmission of the first MAC SDU; the first timer is started with the transmission of the first MAC SDU when the first message is used to determine that the first timer is started with the transmission of the first MAC SDU, and the first timer is started after the first time length is delayed after the transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first time length is delayed after the transmission of the first MAC SDU.

According to one aspect of the application, comprising:

after receiving the first MAC SDU, the first timer is started or restarted when any MAC entity of a sender of the first MAC SDU receives one MAC SDU; after receiving the first MAC SDU, when any MAC entity of a sender of the first MAC SDU transmits one MAC SDU, the first timer is started or restarted; wherein the MAC SDU belongs to a first logical channel set.

According to one aspect of the application, comprising:

the first message comprises a first set of identities indicating at least one of a sender of a first MBS session or a first MAC SDU;

wherein, the time when the sender of the first MAC SDU receives the MAC SDU belonging to the first MBS session is not earlier than the receiving time of the first MAC SDU and is delayed by the first time length.

According to one aspect of the application, comprising:

transmitting the first message through a second logical channel, the second logical channel not belonging to the first logical channel set.

According to one aspect of the application, comprising:

when the first timer expires, the sender of the first MAC SDU enters an RRC idle state.

According to one aspect of the application, comprising:

the first message is used to trigger a random access procedure, and the second message belongs to the random access procedure.

The present application discloses a second node for wireless communication, comprising:

a second transmitter to transmit the first message and the second message from the air interface;

a second receiver receiving a first MAC SDU including a third message used in response to the second message;

Drawings

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

fig. 1 illustrates a transmission flow diagram of a first node according to an embodiment of the application;

FIG. 2 illustrates a schematic diagram of a network architecture according to one embodiment of the present application;

figure 3 illustrates a schematic diagram of radio protocol architecture of a user plane and a control plane according to one embodiment of the present application;

FIG. 4 illustrates a hardware module diagram of a communication device according to one embodiment of the present application;

FIG. 5 illustrates a wireless signal transmission flow diagram according to one embodiment of the present application;

FIG. 6 illustrates a diagram of a random access procedure, a second message and a third message, according to one embodiment of the present application;

fig. 7 illustrates a relationship diagram of a first time length and a first timer for transmission of a first MAC SDU according to an embodiment of the present application;

FIG. 8 illustrates a first timer run according to one embodiment of the present application;

FIG. 9 illustrates a block diagram of a processing device in a first node according to one embodiment of the present application;

fig. 10 illustrates a block diagram of a processing device in a second node according to an embodiment of the present application.

Detailed Description

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

Example 1

Embodiment 1 illustrates a transmission flow diagram of a first node according to an embodiment of the present application, as shown in fig. 1.

In embodiment 1, a first node 100 receives a first message and a second message from an air interface in step 101; transmitting a first MAC SDU in step 102, the first MAC SDU comprising a third message, the third message being used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer starts with the transmission of the first MAC SDU in step 103, starting the first timer after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length.

As an embodiment, the first node is in an RRC idle state prior to receiving the first message.

As one embodiment, the first node is in an RRC inactive state prior to receiving the first message.

As an embodiment, the first node has no activated multicast session before receiving the first message.

For one embodiment, a first message is received from an air interface.

As an embodiment, the air interface is a Uu interface.

As an embodiment, the air interface is a PC5 interface.

In one embodiment, the first message is a paging message (paging message).

For one embodiment, the first node receives the first message on a Paging CHannel (PCH).

As an embodiment, the first node receives the first message in a PO; the PO is a set of PDCCH (Physical Downlink Control Channel) monitoring occasions, and the PO includes at least one time domain resource, which is one of a slot, a subframe, or an OFDM (Orthogonal Frequency Division Multiplexing) symbol.

As an embodiment, the first node determines the PO by: the first node obtains a system frame number of a paging frame by (SFN + PF _ offset) mod T = (T divN) = (UE _ ID modN), and further obtains an index of the PO by i _ s = floor (UE _ ID/N) modNs; wherein the SFN (System Frame Number) is the System Frame Number of the paging Frame; the PF _ offset is a paging frame offset value and is configured by a network; the T is a DRX cycle (discontinuous reception cycle) of the first node, and is configured by a network or is a system default value; n is the total paging frame number in the T time and is configured by a network; the UE _ ID is 5G-S-TMSI mod 1024, the 5G-S-TMSI (5G System architecture Evolution Mobile Station identifier,5G System architecture Evolution Temporary Mobile Station identifier) is used to identify the first node; the i _ s is the index of the PO; the mod (-) is a modulo operation; the floor (·) is a downward rounding operation.

As an embodiment, the paging parameter configured by the network for the first node and the 5G-S-TMSI identifying the first node are specific to the first node, and different UEs may obtain different POs due to different configuration parameters, so that the time for triggering the UE to initiate the random access procedure to enter the RRC connected state is also different.

In one embodiment, the first message is a broadcast message.

For one embodiment, the first message is a multicast message.

As an embodiment, the first node receives the first message on a Broadcast CHannel (BCH).

As an embodiment, the first node receives the first message on a Multicast CHannel (MCH).

According to one embodiment, the UE is triggered to initiate a random access process to enter the RRC connection state according to a system message sent by broadcasting or multicasting, and due to competition in the random access process, the time for the UE to enter the RRC connection state is different.

As an embodiment, the first message comprises a multicast activation notification (multicast activation notification).

For one embodiment, the second message is received from an air interface.

As an embodiment, the second message is received over a CCCH (Common Control Channel).

As a sub-embodiment of the foregoing embodiment, the second message belongs to SRB0 (signaling radio Bearer 0).

As an embodiment, the second message is received over a DCCH (dedicated control Channel).

As a sub-embodiment of the above embodiment, the second message belongs to SRB1 (signaling radio bearer 1).

In one embodiment, the second message is a higher layer message.

As an embodiment, the second message is RRC signaling.

As an embodiment, the second message is a RRCSetup (RRC setup).

As an embodiment, the second message is RRCResume (RRC recovery).

As an embodiment, the first message is used to determine whether to start the first timer with the transmission of the first MAC SDU or to start the first timer after delaying the transmission of the first MAC SDU by the first length of time; starting a first timer with transmission of the first MAC SDU when the first message is used to determine that the first timer is started with transmission of the first MAC SDU; when the first message is used to determine to start a first timer after delaying for a first length of time after transmission of the first MAC SDU, the first timer is started after delaying for the first length of time after transmission of the first MAC SDU.

As an embodiment, the first message is used to implicitly determine whether to start the first timer with the transmission of the first MAC SDU or to start the first timer after delaying the first length of time after the transmission of the first MAC SDU; starting a first timer with transmission of the first MAC SDU when the first message is used to implicitly determine that the first timer with transmission of the first MAC SDU starts; when the first message is used to implicitly determine to start a first timer after delaying for a first length of time after transmission of the first MAC SDU, the first timer is started after delaying for the first length of time after transmission of the first MAC SDU.

As an embodiment, the first node determines from the first message whether to start the first timer with the transmission of the first MAC SDU or to start the first timer after delaying the transmission of the first MAC SDU by the first time length.

For one embodiment, the first timer is maintained at a MAC sublayer of the first node.

As an embodiment, the name of the first timer comprises a datainactivity.

As one embodiment, the first timer is a datainactivity timer.

As an embodiment, the phrase starting the first timer with the transmission of the first MAC SDU includes: starting the first timer when a MAC entity (entity) transmits the first MAC SDU.

As an embodiment, the phrase starting the first timer with the transmission of the first MAC SDU comprises: and if the MAC entity sends the first MAC SDU, starting the first timer.

As an embodiment, the phrase starting the first timer after delaying for a first length of time after transmission of the first MAC SDU comprises: starting the first timer after a first time length is delayed after the MAC entity transmits the first MAC SDU.

As a sub-embodiment of the above three embodiments, the first node is configured with the first timer.

As one embodiment, the value of the first length of time is not less than 0.

As one embodiment, the value of the first length of time is greater than 0.

As one embodiment, the value of the first length of time is equal to 0.

As an embodiment, the first MAC SDU is transmitted over a DCCH.

As a sub-embodiment of the above embodiment, the second message belongs to SRB1.

As an embodiment, the first MAC SDU comprises a third message used in response to the second message.

As an embodiment, the third message is a higher layer message.

As an embodiment, the third message is RRC signaling.

As an embodiment, the third message is RRC setup complete, and the third message is used to confirm that RRC connection setup is successfully completed.

As an embodiment, the third message is RRCResumeComplete (RRC recovery complete), and the third message is used to confirm that RRC connection recovery is successfully completed.

Example 2

Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in fig. 2. Fig. 2 illustrates a network architecture 200 of NR 5g, LTE (Long-Term evolution, long Term evolution) and LTE-a (Long-Term evolution advanced, enhanced Long Term evolution) systems. The NR 5g, LTE or LTE-a network architecture 200 may be referred to as a 5GS (5G System)/EPS (evolved packet System) 200 or some other suitable terminology. The 5GS/EPS 200 may include one or more UEs (User Equipment) 201, ng-RANs (next generation radio access networks) 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 200 may interconnect with other access networks, but these entities/interfaces are not shown for simplicity. As shown, the 5GS/EPS 200 provides packet-switched services, however those skilled in the art will readily appreciate that the various concepts presented throughout this application may be extended to networks providing circuit-switched services or other cellular networks. The NG-RAN includes NR node bs (gnbs) 203 and other gnbs 204. The gNB203 provides user and control plane protocol terminations towards the UE 201. The gnbs 203 may be connected to other gnbs 204 via an Xn interface (e.g., backhaul). The XnAP protocol of the Xn interface is used to transmit control plane messages of the wireless network, and the user plane protocol of the Xn interface is used to transmit user plane data. The gNB203 may also be referred to as a base station, a base transceiver station, a wireless base station, a wireless transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a TRP (Transmission Reception Point), or some other suitable terminology, and in an NTN network, the gNB203 may be a satellite, an aircraft, or a ground base station relayed through a satellite. The gNB203 provides the UE201 with an access point to the 5GC/EPC210. Examples of UEs 201 include cellular phones, smart phones, session Initiation Protocol (SIP) phones, laptops, personal Digital Assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband internet of things (iot) devices, machine-type communication devices, land vehicles, automobiles, vehicular devices, vehicular communication units, wearable devices, or any other similar functioning device. UE201 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The gNB203 is connected to the 5GC/EPC210 via an S1/NG interface. The 5GC/EPC210 includes MME (Mobility Management Entity)/AMF (Authentication Management field)/SMF (session Management Function) 211, other MME/AMF/SMF214, S-GW (serving Gateway)/UPF (User Plane Function) 212, and P-GW (packet data Network Gateway)/UPF 213.MME/AMF/SMF211 is a control node that handles signaling between UE201 and 5GC/EPC210. In general, the MME/AMF/SMF211 provides bearer and connection management. All user IP (internet protocol) packets are transmitted through the S-GW/UPF212, and the S-GW/UPF212 is itself connected to the P-GW/UPF213. The P-GW provides UE IP address allocation as well as other functions. The P-GW/UPF213 is connected to the internet service 230. The internet service 230 includes an operator-corresponding internet protocol service, and may specifically include the internet, an intranet, an IMS (IP Multimedia Subsystem), and a PS (Packet Switching) streaming service.

As an embodiment, the UE201 corresponds to a first node in the present application.

As an embodiment, the NR node B corresponds to a second node in the present application.

As an embodiment, the UE201 supports multimedia services.

As an embodiment, the UE201 supports multicast transmission.

As an example, the gNB203 is a macro Cell (Marco Cell) base station.

As an embodiment, the gNB203 is a Micro Cell (Micro Cell) base station.

As an embodiment, the gNB203 is a Pico Cell (Pico Cell) base station.

As an embodiment, the gNB203 is a home base station (Femtocell).

As an embodiment, the gNB203 is a base station device supporting a large delay difference.

As an example, the gNB203 is a flight platform device.

As an embodiment, the gNB203 is a satellite device.

As an embodiment, the gNB203 supports multimedia services.

As an embodiment, the gNB203 supports multicast transmission.

As an embodiment, the radio link from the UE201 to the gNB203 is an uplink.

As an embodiment, the radio link from the gNB203 to the UE201 is a downlink.

As an embodiment, the radio link from the UE201 to the UE241 is a sidelink.

As an embodiment, the UE201 and the gNB203 are connected through a Uu interface.

As an embodiment, the UE201 and the UE241 are connected through a PC5 Reference Point (Reference Point).

Example 3

Embodiment 3 illustrates a schematic diagram of radio protocol architecture of a user plane and a control plane according to an embodiment of the present application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of radio protocol architecture for the user plane 350 and the control plane 300, fig. 3 showing the radio protocol architecture of the control plane 300 for the UE and the gNB in three layers: layer 1, layer 2 and layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to herein as PHY301. Layer 2 (L2 layer) 305 is above PHY301, and is responsible for the link between the UE and the gNB through PHY301. The L2 layer 305 includes a MAC (media access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the gbb on the network side. The PDCP sublayer 304 provides data ciphering and integrity protection, and the PDCP sublayer 304 also provides handover support for UEs between gnbs. The RLC sublayer 303 provides segmentation and reassembly of packets, retransmission of missing packets by ARQ, and the RLC sublayer 303 also provides duplicate packet detection and protocol error detection. The MAC sublayer 302 provides mapping between logical and transport channels and multiplexing of logical channel identities. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in one cell among the UEs. The MAC sublayer 302 is also responsible for HARQ (hybrid automatic repeat request) operations. A 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 gNB and the UE. The radio protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer), the radio protocol architecture in the user plane 350 is substantially the same for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355 and the MAC sublayer 352 in the L2 layer 355 as the corresponding layers and sublayers in the control plane 300, but the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 further includes a Service Data Adaptation Protocol (SDAP) sublayer 356, and the SDAP sublayer 356 is responsible for mapping between QoS (Quality of Service) streams and Data Radio Bearers (DRBs) to support diversity of services. The radio protocol architecture of the UE in the user plane 350 may include some or all of the protocol sublayers including the SDAP sublayer 356, the pdcp sublayer 354, the rlc sublayer 353, and the MAC sublayer 352 at the L2 layer. Although not shown, the UE may also have several upper layers above the L2 layer 355, including a network layer (e.g., IP layer) that terminates at the P-GW on the network side and an application layer that terminates at the other end of the connection (e.g., far end UE, server, etc.).

As an example, the wireless protocol architecture in fig. 3 is applicable to the first node in the present application.

As an example, the wireless protocol architecture in fig. 3 is applicable to the second node in the present application.

As an example, a logical channel (logical channel) is a SAP between the RLC303 and the MAC 302.

As an example, a logical channel is an SAP between the RLC353 and the MAC352.

As an example, a transport channel (transport channel) is a SAP between the MAC302 and the PHY301.

As an example, the transport channel is a SAP between the MAC352 and the PHY 351.

As an embodiment, the first message in this application is generated in the RRC306.

As an embodiment, the second message in this application is generated in the RRC306.

As an embodiment, the third message in this application is generated in the RRC306.

As an embodiment, the first MAC SDU in this application is generated in the MAC302 or the MAC352.

As an example, the L2 layer 305 belongs to a higher layer.

As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

Example 4

Embodiment 4 illustrates a hardware module schematic diagram of a communication device according to an embodiment of the 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.

The first communications device 450 includes a controller/processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter/receiver 454, and an antenna 452.

The second communication device 410 includes a controller/processor 475, a memory 476, a data source 477, a receive processor 470, a transmit processor 416, a multiple antenna receive processor 472, a multiple antenna transmit processor 471, a transmitter/receiver 418, and an antenna 420.

In transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, an upper layer data packet from the core network or an upper layer data packet from a data source 477 is provided to the controller/processor 475. The core network and data source 477 represents all protocol layers above the L2 layer. The controller/processor 475 implements the functionality of the L2 layer. In transmissions from the second communications device 410 to the first communications device 450, the controller/processor 475 provides for header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communications device 450 based on various priority metrics. The controller/processor 475 is also responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate Forward Error Correction (FEC) at the second communication device 410, as well as mapping of signal constellation based on various modulation schemes (e.g., binary Phase Shift Keying (BPSK), quadrature Phase Shift Keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. Transmit processor 416 then maps each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time and/or frequency domain, and then uses an Inverse Fast Fourier Transform (IFFT) to generate the physical channels carrying the time-domain multicarrier symbol streams. The multi-antenna transmit processor 471 then performs transmit analog precoding/beamforming operations on the time domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream that is then provided to a different antenna 420.

In a transmission from the second communications apparatus 410 to the first communications apparatus 450, each receiver 454 receives a signal through its respective antenna 452 at the first communications apparatus 450. Each receiver 454 recovers information modulated onto a radio frequency carrier and converts the radio frequency stream into a baseband multi-carrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multiple antenna receive processor 458 implement various signal processing functions of the L1 layer. A multi-antenna receive processor 458 performs receive analog precoding/beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. Receive processor 456 converts the received analog precoded/beamformed baseband multicarrier symbol stream 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 to be used for channel estimation are demultiplexed by the receive processor 456, and the data signals are subjected to multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered at a receive processor 456 and soft decisions are generated. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communications 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 may be associated with a memory 460 that stores program codes and data. Memory 460 may be referred to as a computer-readable medium. In transmissions from the second communications device 410 to the first communications 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 packets from the second communications device 410. The upper layer packet is then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

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

In a transmission from the first communication device 450 to the second communication device 410, the functionality at the second communication device 410 is similar to the receiving functionality 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 rf signals through its respective antenna 420, converts the received rf signals to baseband signals, and provides the baseband signals to a multi-antenna receive processor 472 and a receive processor 470. The receive processor 470 and the multiple antenna receive processor 472 collectively implement the functions of the L1 layer. The controller/processor 475 implements the L2 layer functions. The controller/processor 475 can be associated with a memory 476 that stores program codes and data. Memory 476 may be referred to as a computer-readable medium. In 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 packets from the first communication device 450. Upper layer data packets from the controller/processor 475 may be provided to all protocol layers above the core network or L2 layer and various control signals may also be provided to the core network or L3 for L3 processing.

As an embodiment, the first communication device 450 apparatus includes: 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, for use with the at least one processor, the first communication device 450 apparatus at least: receiving a first message and a second message from an air interface; transmitting a first MAC SDU, the first MAC SDU comprising a third message, the third message used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length; wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

As an embodiment, the first communication device 450 apparatus includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: receiving a first message and a second message from an air interface; transmitting a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length; wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

As an embodiment, the second communication device 410 apparatus includes: 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, for use with the at least one processor, the first communication device 410 apparatus at least: transmitting the first message and the second message from the air interface; receiving a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; wherein the first message is used to determine whether to start a first timer with transmission of the first MAC SDU or to start the first timer after a delay of a first length of time following transmission of the first MAC SDU; the first timer is started with the transmission of the first MAC SDU when the first message is used to determine that the first timer is started with the transmission of the first MAC SDU, and the first timer is started after the first time length is delayed after the transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first time length is delayed after the transmission of the first MAC SDU.

As an embodiment, the second communication device 410 apparatus includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: transmitting the first message and the second message from the air interface; receiving a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; wherein the first message is used to determine whether to start a first timer with transmission of the first MAC SDU or to start the first timer after a delay of a first length of time following transmission of the first MAC SDU; the first timer is started with the transmission of the first MAC SDU when the first message is used to determine that the first timer is started with the transmission of the first MAC SDU, and the first timer is started after the first length of time is delayed after the transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first length of time is delayed after the transmission of the first MAC SDU.

For one embodiment, the first communication device 450 corresponds to a first node in the present application; the second communication device 410 corresponds to a second node in the present application.

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

For one embodiment, the first communication device 450 is an RSU.

For one embodiment, the second communication device 410 is a base station.

For one embodiment, the second communication device 410 is an RSU.

For one embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller/processor 475 is configured to send the first message as described herein.

For one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receive processor 458, the receive processor 456 or the controller/processor 459 is configured to receive the first message in the present application.

For one embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller/processor 475 is configured to send the second message.

For one embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receive processor 458, the receive processor 456, or the controller/processor 459 is configured to receive a second message as described herein.

For one embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468, and the controller/processor 459 is configured to transmit a first MAC SDU in this application.

As an example, at least one of the antenna 420, the receiver 418, the multi-antenna receive processor 472, the receive processor 470, and the controller/processor 475 may be configured to receive a first MAC SDU in this application.

Example 5

Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 5.

ForFirst node U51Receiving a first message in step S511; receiving a second message in step S512; transmitting a first MAC SDU in step S513; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer starts with the transmission of the first MAC SDU in step S514, and starting the first timer after delaying the transmission of the first MAC SDU by the first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length.

ForSecond node N52Transmitting a first message in step S521; transmitting a second message in step S522; the first MAC SDU is received in step S523.

In embodiment 5, a first message and a second message are received from an air interface; transmitting a first MAC SDU, the first MAC SDU comprising a third message, the third message being used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length; wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU; after sending the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node receives a MAC SDU; after sending the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node sends a MAC SDU; wherein the MAC SDU belongs to a first logical channel set; when the first message indicates the first length of time, the first message is used to determine to start the first timer after delaying the first length of time after transmission of the first MAC SDU; the first message includes a first set of identities indicating at least one of a first MBS session or a first node; wherein, the time when the first node receives the MAC SDU belonging to the first MBS conversation is not earlier than the sending time of the first MAC SDU and is delayed for the first time length; receiving the first message through a second logical channel, the second logical channel not belonging to the first set of logical channels; when the first timer expires, the first node enters an RRC idle state; the first message is used to trigger a random access procedure, and the second message belongs to the random access procedure.

As an embodiment, the second node is a serving cell of the first node.

As one embodiment, the first node and the second node are synchronized.

As an embodiment, the first node and the second node are time synchronized.

As an embodiment, the first node is configured with at least one MAC entity, the one MAC entity corresponds to one cell group (cell group), and the first cell group includes at least one cell (cell).

As an embodiment, when the first node is configured with MCG (Master Cell Group) only, the first node includes one MAC entity.

As an embodiment, when the first node is configured with a SCG (Secondary Cell Group), the first node is configured with 2 MAC entities, where one MAC entity corresponds to a MCG and the other MAC entity corresponds to a SCG.

As an embodiment, when the first node is configured with a DAPS (dual active Protocol Stack) handover, the first node uses 2 MAC entities, where one MAC entity corresponds to a source cell and is called a source MAC entity (source MAC entry), and the other MAC entity corresponds to a target cell and is called a target MAC entity (target MAC entry).

As an embodiment, the first message is used to trigger a random access procedure.

As an embodiment, the first node receives the first message, the first message indicating traffic arrival; in response to receiving the first message, the first node initiates a random access procedure.

As an embodiment, the random access procedure includes that the first node transmits a random access preamble (preamble) on a PRACH (Physical random access CHannel) occasion after receiving the first message.

As an embodiment, the second message belongs to the random access procedure.

As an embodiment, the first node enters an RRC connected state after receiving the second message.

As an embodiment, the first message includes a first set of identities indicating at least one of a first MBS session (session) or a first node.

As an embodiment, the first identifier set includes a first MBS identifier, and the first MBS identifier is used to indicate the first MBS session.

As an embodiment, the first MBS identification is TMGI (temporary mobile Group Identity).

As an embodiment, the first MBS identification is a session ID (session identification).

As an embodiment, the first MBS identities are a TMGI and a session ID.

As one embodiment, the first set of identities includes a first node identity, the first node identity being used to indicate the first node.

As an embodiment, the first node is identified as NG-5G-S-TMSI (NG 5G S-temporal Mobile Subscription Identifier, next generation 5G S-Temporary Mobile Subscription Identifier).

As an embodiment, the first node identity is I-RNTI-Value (Inactive-Radio network temporary identity Value).

As an embodiment, the first node identifier is an IMSI (International Mobile Subscriber Identity).

As an embodiment, the first MBS session identity belongs to a paging group list.

As one embodiment, the first node identification belongs to a pagerecord list.

As an embodiment, the time when the first node receives the MAC SDU belonging to the first MBS session is not earlier than the transmission time of the first MAC SDU and is delayed by the first time length.

As an embodiment, the first node receives MAC SDUs belonging to the first MBS session after entering an RRC connected state.

As an embodiment, the first time length indicates a time interval for the first node to confirm that RRC connection establishment is successfully completed to the start of the first MBS session.

As an embodiment, the first time length indicates a time interval for the first node to confirm successful completion of RRC connection recovery until the first MBS session starts.

As an embodiment, when the first message indicates the first length of time, the first message is used to determine to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

As an embodiment, when the first message does not indicate the first length of time, the first message is used to determine to start the first timer with the transmission of the first MAC SDU.

As one embodiment, the first message implicitly indicates the first length of time.

As an embodiment, the first message indicates the first length of time when the first set of identities only indicates the first MBS session and not the first node.

As one embodiment, the value of the first length of time is a default value.

As one embodiment, the value of the first length of time is configured by a network.

As an embodiment, the value of the first length of time is configured by the second node.

As an embodiment, the value of the first length of time is preconfigured.

As an embodiment, said value of said first length of time is standard defined.

As an embodiment, the first message comprises a start time of the first MBS session.

For one embodiment, the first message includes a second length of time.

As an embodiment, the start time of the first MBS session is a transmission time of an earliest MAC SDU belonging to the first MBS session.

As an embodiment, the first node determines the first time length according to the start time of the first MBS session and the transmission time of the first MAC SDU.

As an embodiment, a difference between the start time of the first MBS session minus the transmission time of the first MAC SDU is the first time length.

As an embodiment, the second time length indicates a length of time between the start time of the first MBS session and the time of receipt of the first message.

As an embodiment, the difference between the second time length minus the third time length is the first time length; wherein the third time length is a time length between the transmission time of the first MAC SDU minus the reception time of the first message.

As an embodiment, the second length of time and the third length of time use the same unit of measure.

As an embodiment, the first time length is expressed in slots (slots).

As an embodiment, the second time length and the third time length are respectively expressed in slots (slots).

As an embodiment, the first temporal length is represented in subframes (subframes).

As an embodiment, the second time length and the third time length are respectively expressed in subframes (subframes).

As one embodiment, the first length of time is represented in frames (frames).

As an embodiment, the second time length and the third time length are each expressed in frames (frames).

As one embodiment, the first length of time is expressed in milliseconds (ms).

As one embodiment, the second time length and the third time length are each expressed in milliseconds (ms).

As an embodiment, the first length of time is expressed in seconds(s).

As an embodiment, the second time length and the third time length are each expressed in seconds(s).

As one embodiment, when the value of the first length of time is less than 0, the value of the first length of time is 0.

As an embodiment, the first timer is started with transmission of the first MAC SDU when the value of the first time length is 0.

As an embodiment, the first message indicates the first time length, so that the UE starts the first timer after delaying for different time lengths after entering the RRC connected state, thereby effectively supporting multicast transmission in the RRC connected state and avoiding that the UE enters the RRC idle state due to no data transceiving within a preset time length.

As an embodiment, after sending the first MAC SDU, when any MAC entity of the first node receives one MAC SDU, the first timer is started or restarted; wherein the MAC SDU belongs to a first logical channel set.

As an embodiment, after sending the first MAC SDU, when any MAC entity of the first node sends a MAC SDU, starting or restarting the first timer; wherein the MAC SDU belongs to a first logical channel set.

As an embodiment, after sending the first MAC SDU, if any MAC entity of the first node receives a MAC SDU, starting or restarting the first timer; wherein the MAC SDU belongs to a first logical channel set.

As an embodiment, after sending the first MAC SDU, if any MAC entity of the first node sends a MAC SDU, starting or restarting the first timer; wherein the MAC SDU belongs to a first logical channel set.

As a sub-embodiment of the four embodiments described above, the first node is configured with the first timer.

As one embodiment, the first set of logical channels includes at least one logical channel.

As an embodiment, the data belonging to at least one logical channel of the first set of logical channels is transmitted by unicast.

As an embodiment, the data belonging to at least one logical channel in said first set of logical channels is transmitted by MBS multicast.

As an example, unicast transmission means that data at a physical layer is scrambled by a unicast RNTI (Radio network temporary identity).

As an example, multicast transmission means that physical layer data is scrambled by multicast RNTI.

The unicast RNTI for one embodiment comprises a C-RNTI (Cell-RNTI, cell radio network temporary identity).

For one embodiment, the unicast RNTI includes a CS-RNTI (Configured Scheduling-RNTI).

The unicast RNTI includes a TC-RNTI (Temporary Cell-RNTI), as one embodiment.

The unicast RNTI includes, as an embodiment, MCS-C-RNTI (Modulation and Coding Scheme-Cell-RNTI, modulation and Coding Scheme Cell radio network temporary identity).

As an embodiment, the multicast RNTI includes a G-RNTI (Group-RNTI).

The multicast RNTI includes a G-CS-RNTI (Group-Configured scheduled-RNTI, packet configuration Scheduling radio network temporary identity) as one embodiment.

For one embodiment, the first set of logical channels comprises a CCCH.

As one embodiment, the first set of logical channels comprises a DCCH.

As an embodiment, the first set of logical channels includes a DTCH (dedicated traffic Channel).

As an embodiment, the first set of logical channels includes an SC-MCCH (Single Cell-Multicast Control CHannel).

For one embodiment, the first set of logical channels includes a SC-MTCH (Single Cell-MulticastTraffic CHannel).

As an embodiment, the first message is received through a second logical channel, which does not belong to the first set of logical channels.

As an embodiment, the second logical CHannel is a PCCH (Paging Control CHannel).

As an embodiment, the second logical CHannel is an MCCH (multicast control CHannel).

As an embodiment, the second logical CHannel is a BCCH (broadcast control CHannel).

For one embodiment, the first node enters an RRC idle state when the first timer expires.

As one embodiment, the first timer is applied for data inactivity monitoring in unicast or multicast transmissions when the first node is in an RRC connected state.

As one embodiment, the first timer is not applied for data inactivity monitoring in broadcast transmissions.

As an embodiment, when the first timer expires, the MAC sublayer of the first node indicates to an upper layer of the first node.

As an embodiment, the upper layer is an RRC sublayer.

Example 6

Embodiment 6 illustrates a random access procedure, a schematic diagram of a second message and a third message according to an embodiment of the present application, as shown in fig. 6.

As an embodiment, the random access procedure is a 4-step random access procedure, and the second message is included in the message transmitted in the fourth step.

As an embodiment, the random access procedure is a 2-step random access procedure, and the second message is included in the message transmitted in the step B.

In case a of fig. 6, the first node adopts a 4-step random access procedure, which includes: in a first step the first node sends a random access preamble; in the second step, the second node sends a random access response, and the random access response carries scheduling resources; in a third step the first node transmits on the scheduled resource; in the fourth step, the second node sends a contention resolution. When the first node is in an RRC idle state before initiating random access, in a third step the first node sends an RRC setup request (RRC establishment request), and in a fourth step the second node sends the second message, where the second message is an RRC setup, and as a response to receiving the RRC setup, the first node sends the first MAC SDU, where the first MAC SDU includes an RRC setup complete; when the first node is in an RRC inactive state before initiating random access, in a third step, the first node sends RRCResuRequest (RRC recovery request) or RRCResuRequest 1 (RRC recovery request 1), and in a fourth step, the second node sends the second message, wherein the second message is RRCResume, and in response to receiving the RRCResume, the first node sends the first MAC SDU, and the first MAC SDU comprises RRCResuComplete. The first step, the second step and the third step are performed after the reception of the first message.

In case B of fig. 6, the first node adopts a 2-step random access procedure, which includes: in step a, the first node sends a random access preamble and sends a PUSCH load (payload) on a PUSCH (Physical Uplink Shared Channel) occasion (occasion); in step B the second node sends a contention resolution. When the first node is in an RRC idle state before initiating random access, the first node sends an RRCSetupRequest in a PUSCH occasion of step a, and the second node sends the second message in step B, where the second message is an RRCSetup, and as a response to receiving the RRCSetup, the first node sends the first MAC SDU, which includes an RRCSetupComplete; when the first node is in an RRC inactive state before initiating random access, the first node sends RRCRESUMREQUEST or RRCRESUMREQUEST 1 in a PUSCH opportunity of step A, and the second node sends the second message in step B, wherein the second message is RRCRESUME, and the first node sends the first MAC SDU as a response to receiving the RRCRESUME, wherein the first MAC SDU comprises RRCRESUMeComplete. Said step a is performed after the reception of said first message.

For one embodiment, the second message is used to configure the first timer.

As an embodiment, the second message is used to establish (Setup) the first timer.

For one embodiment, the second message includes an expiration value of the first timer.

As an embodiment, the RRCSetup is used to establish SRB1.

As an embodiment, the rrcreesume is used to resume (resume) suspended (suspended) RRC connection.

Example 7

Embodiment 7 illustrates a relationship between the first time length and the first timer for transmitting the first MAC SDU according to an embodiment of the present application, as shown in fig. 7.

As an embodiment, when the first message is used to determine to start a first timer after delaying for a first length of time after transmission of the first MAC SDU, the first timer is started after delaying for the first length of time after transmission of the first MAC SDU; wherein the MAC entity of the first node does not transmit and does not receive MAC SDUs belonging to the first set of logical channels within the first length of time after the transmission of the first MAC SDU.

As an embodiment, when the first message is used to determine to start a first timer after a first time length is delayed after the transmission of the first MAC SDU, the first timer is started with the transmission or reception of each of the at least one MAC SDU if the MAC entity of the first node transmits or receives at least one MAC SDU belonging to the first logical channel set within the first time length after the transmission of the first MAC SDU.

As a sub-embodiment of the foregoing embodiment, the running state of the first timer is maintained after delaying the first time length after the transmission of the first MAC SDU.

As one embodiment, the phrase maintaining the running state of the first timer comprises: and if the first timer is in a running state, not restarting the first timer.

As one embodiment, the phrase maintaining the running state of the first timer comprises: not starting the first timer if the first timer is in an expired state.

In case a of fig. 7, the first timer is started along with the transmission of the first MAC SDU.

In case B of fig. 7, the first timer is started after delaying the first time length after the transmission of the first MAC SDU; wherein the MAC entity of the first node does not transmit and does not receive MAC SDUs belonging to the first set of logical channels within the first length of time after the transmission of the first MAC SDU.

In case C of fig. 7, the MAC entity of the first node transmits or receives at least one MAC SDU belonging to the first set of logical channels within the first time length after the transmission of the first MAC SDU, and the first timer is started in conjunction with the transmission or reception of each of the at least one MAC SDU.

Example 8

Embodiment 8 illustrates a schematic diagram of the operation of a first timer according to an embodiment of the present application, as shown in fig. 8.

Starting a first timer at step S801; in step S802, a first timer is updated in a next first time interval; in step S803, it is determined whether the first timer has expired, and if so, the process ends, and if not, the process returns to step S802.

As an embodiment, when the first timer is running, the first timer is updated at each of the first time intervals.

As an embodiment, when the first timer is not in a running state, the updating of the first timer at each of the first time intervals is stopped.

As one example, the first time interval is 1 millisecond.

As an embodiment, the first time interval is one subframe (subframe).

As an embodiment, the first time interval is one slot (slot).

As an embodiment, the expiration value of the first timer and the first time interval use the same units of measure.

As one embodiment, setting the value of the first timer to 0 when starting the first timer, the phrase updating the first timer comprises: adding 1 to the value of the first timer; the first timer expires when the value of the first timer is the expired value of the first timer.

As one embodiment, setting the value of the first timer to the expired value of the first timer when the first timer is started, the phrase updating the first timer includes: subtracting 1 from the value of the first timer; when the value of the first timer is 0, the first timer expires.

As an embodiment, the first timer is in a running state after starting; and stopping running after the first timer expires.

As an example, when the first time interval is 1 millisecond, the next one of the first time intervals is one millisecond that is upcoming.

As an embodiment, when the first time interval is a subframe, the next one of the first time intervals is an upcoming subframe.

As an embodiment, when said first time interval is a time slot, said next first time interval is an upcoming time slot.

Example 9

Embodiment 9 illustrates a block diagram of a processing device in a first node according to an embodiment of the present application, as shown in fig. 9. In fig. 9, a first node processing apparatus 900 includes a first receiver 901 and a first transmitter 902. The first receiver 901 includes at least one of the transmitter/receiver 418 (including the antenna 420), the receive processor 470, the multiple antenna receive processor 472, or the controller/processor 475 of fig. 4 herein; the first transmitter 902 includes at least one of the transmitter/receiver 418 (including the antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller/processor 475 of fig. 4 of the present application.

In embodiment 9, a first receiver 901 receives a first message and a second message from an air interface; a first transmitter 902, which transmits a first MAC SDU comprising a third message used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length; wherein the first message is used to determine whether to start the first timer with transmission of the first MAC SDU or to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

As an embodiment, the first transmitter 902, after transmitting the first MAC SDU, starts or restarts the first timer when any MAC entity of the first node receives a MAC SDU; after transmitting the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node transmits one MAC SDU; wherein the MAC SDU belongs to a first logical channel set.

As an embodiment, when the first message indicates the first length of time, the first message is used to determine to start the first timer after delaying the first length of time after the transmission of the first MAC SDU.

As an embodiment, the first message includes a first set of identities indicating at least one of a first MBS session or a first node; wherein, the time when the first node receives the MAC SDU belonging to the first MBS session is not earlier than the sending time of the first MAC SDU and is delayed by the first time length.

As an embodiment, the first transmitter 902, after transmitting the first MAC SDU, starts or restarts the first timer when any MAC entity of the first node receives a MAC SDU; after transmitting the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node transmits one MAC SDU; wherein the MAC SDU belongs to a first logical channel set; receiving the first message through a second logical channel, the second logical channel not belonging to the first set of logical channels.

As an embodiment, the first message is used to trigger a random access procedure, and the second message belongs to the random access procedure.

Example 10

Embodiment 10 illustrates a block diagram of a processing device in a second node according to an embodiment of the present application, as shown in fig. 10. In fig. 10, the second node processing apparatus 1000 includes a second receiver 1001 and a second transmitter 1002. The second receiver 1001 includes at least one of the transmitter/receiver 418 (including the antenna 420), the receive processor 470, the multi-antenna receive processor 472, or the controller/processor 475 of fig. 4 herein; the second transmitter 1002 includes at least one of the transmitter/receiver 418 (including the antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller/processor 475 of fig. 4 of the present application.

In embodiment 10, the second transmitter 1002 transmits the first message and the second message from the air interface; a second receiver 1001 receiving a first MAC SDU including a third message used in response to the second message; wherein the first message is used to determine whether to start a first timer with transmission of the first MAC SDU or to start the first timer after a first time length delay following transmission of the first MAC SDU; the first timer is started with the transmission of the first MAC SDU when the first message is used to determine that the first timer is started with the transmission of the first MAC SDU, and the first timer is started after the first length of time is delayed after the transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first length of time is delayed after the transmission of the first MAC SDU.

As an embodiment, after receiving the first MAC SDU, when any MAC entity of the sender of the first MAC SDU receives one MAC SDU, the first timer is started or restarted; after receiving the first MAC SDU, when any MAC entity of a sender of the first MAC SDU transmits one MAC SDU, the first timer is started or restarted; wherein the MAC SDU belongs to a first logical channel set.

As an embodiment, the first message includes a first set of identities indicating at least one of a sender of the first MBS session or the first MAC SDU; wherein, the time when the sender of the first MAC SDU receives the MAC SDU belonging to the first MBS session is not earlier than the time when the first MAC SDU is received, and is delayed by the first time length.

As an embodiment, after receiving the first MAC SDU, the first timer is started or restarted when any MAC entity of the sender of the first MAC SDU receives one MAC SDU; after receiving the first MAC SDU, when any MAC entity of a sender of the first MAC SDU transmits one MAC SDU, the first timer is started or restarted; wherein the MAC SDU belongs to a first logical channel set; transmitting the first message through a second logical channel, the second logical channel not belonging to the first logical channel set.

As an embodiment, when the first timer expires, the sender of the first MAC SDU enters an RRC idle state.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The first Type of Communication node or UE or terminal in the present application includes, but is not limited to, a mobile phone, a tablet computer, a notebook, a network card, a low power consumption device, an eMTC (enhanced machine Type Communication) device, an NB-IoT device, a vehicle-mounted Communication device, an aircraft, an airplane, an unmanned aerial vehicle, a remote control plane, and other wireless Communication devices. The second type of communication node, base station or network side device in the present application includes, but is not limited to, a macro cell base station, a micro cell base station, a home base station, a relay base station, an eNB, a gNB, a Transmission and Reception node TRP (Transmission and Reception Point), a relay satellite, a satellite base station, an air base station, and other wireless communication devices.

It will be appreciated by those skilled in the art that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents thereof are intended to be embraced therein.

Claims

1. A first node configured for wireless communication, comprising:

a first transmitter to transmit a first MAC SDU, the first MAC SDU comprising a third message, the third message used in response to the second message; starting the first timer with the transmission of the first MAC SDU when the first message is used to determine that the first timer with the transmission of the first MAC SDU starts, starting the first timer with the transmission of the first MAC SDU after delaying the transmission of the first MAC SDU by a first time length when the first message is used to determine that the first timer starts after delaying the transmission of the first MAC SDU by the first time length;

2. The first node of claim 1, comprising:

the first transmitter, after transmitting the first MAC SDU, starts or restarts the first timer when any MAC entity of the first node receives a MAC SDU; after transmitting the first MAC SDU, starting or restarting the first timer when any MAC entity of the first node transmits one MAC SDU;

wherein the MAC SDU belongs to a first logical channel set.

3. The first node according to claim 1 or 2, wherein when the first message indicates the first length of time, the first message is used to determine to start the first timer after delaying the first length of time after transmission of the first MAC SDU.

4. The first node of any of claims 1-3, wherein the first message comprises a first set of identities indicating at least one of the first MBS session or the first node;

wherein, the time when the first node receives the MAC SDU belonging to the first MBS conversation is not earlier than the sending time of the first MAC SDU and is delayed for the first time length.

5. The first node according to any of claims 2 to 4, wherein the first message is received over a second logical channel, which does not belong to the first set of logical channels.

6. The first node according to any of claims 1 to 5, wherein the first node enters an RRC idle state when the first timer expires.

7. The first node according to any of claims 1 to 6, wherein the first message is used to trigger a random access procedure, and wherein the second message belongs to the random access procedure.

8. A second node configured for wireless communication, comprising:

a second receiver to receive a first MAC SDU, the first MAC SDU including a third message, the third message being used in response to the second message;

wherein the first message is used to determine whether to start a first timer with transmission of the first MAC SDU or to start the first timer after a first time length delay following transmission of the first MAC SDU; the first timer is started with the transmission of the first MAC SDU when the first message is used to determine that the first timer is started with the transmission of the first MAC SDU, and the first timer is started after the first time length is delayed after the transmission of the first MAC SDU when the first message is used to determine that the first timer is started after the first time length is delayed after the transmission of the first MAC SDU.

9. A method in a first node used for wireless communication, comprising:

receiving a first message and a second message from an air interface;

10. A method in a second node used for wireless communication, comprising:

transmitting the first message and the second message from the air interface;

receiving a first MAC SDU, the first MAC SDU comprising a third message, the third message used in response to the second message;