CN119815440A

CN119815440A - A method and device for mobility management in wireless communication

Info

Publication number: CN119815440A
Application number: CN202410474211.2A
Authority: CN
Inventors: 陈宇; 张晓博
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-04-18
Filing date: 2024-04-18
Publication date: 2025-04-11
Also published as: WO2025218386A1

Abstract

A method and apparatus for mobility management in wireless communication are disclosed, including receiving first information indicating a first MAC entity of the first node to serve a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, the serving the first cell and the second cell including receiving or transmitting a MAC PDU from or to the first cell, receiving or transmitting a MAC PDU from or to the second cell. The application can reduce the switching time delay, ensure the continuity in switching, and is especially suitable for the LTM cell switching of non-RACH.

Description

Method and apparatus for mobility management in wireless communication

Technical Field

The present application relates to a method of mobility management in a cellular wireless communication system, and in particular to layer 1 layer 2 triggered mobility management of non-RACH.

Background

Future wireless communication systems have more and more diversified application scenes, and different application scenes have different performance requirements on the system. To meet the different performance requirements of various application scenarios, a New air interface technology (NR) is decided to be researched in 3GPP (3 rd Generation Partner Project, third Generation partnership project) RAN (Radio Access Network ) #72 full-time, and a standardization Work for NR is started in 3GPP RAN #75 full-time with NR's WI (Work Item).

In Communication, both LTE (Long Term Evolution ) and 5G NR can be involved in reliable accurate reception of information, optimized energy efficiency ratio, determination of information validity, flexible resource allocation, scalable system structure, efficient non-access layer information processing, lower service interruption and disconnection rate, support for low power consumption, which is important for normal Communication of base stations and user equipments, reasonable scheduling of resources, balancing of system load, so-called high throughput, meeting Communication requirements of various services, improving spectrum utilization, improving base stone of service quality, whether eMBB (ehanced Mobile BroadBand, enhanced mobile broadband), URLLC (Ultra Reliable Low Latency Communication, ultra-high reliability low-latency Communication) or eMTC (ENHANCED MACHINE TYPE Communication ) are indispensable. Meanwhile, in IIoT (Industrial Internet of Things, in the internet of things in the industrial field, in V2X (vehicle to X) communication (Device to Device) between devices, in communication of unlicensed spectrum, in user communication quality monitoring, in network planning optimization, in TN (TERRITERIAL NETWORK, terrestrial network communication), in dual connectivity (Dual connectivity) system, in radio resource management and codebook selection of multiple antennas, in signaling design, neighbor cell management, service management, in beamforming, information transmission modes are classified into broadcasting and unicast, and both transmission modes are indispensable for 5G system because they are very helpful to meet the above requirements.

With the increasing of the scene and complexity of the system, the system has higher requirements on reducing the interruption rate, reducing the time delay, enhancing the reliability, enhancing the stability of the system, and the flexibility of the service, and saving the power, and meanwhile, the compatibility among different versions of different systems needs to be considered in the system design.

Disclosure of Invention

Researchers find that in a 5G communication system, one MAC entity only serves one cell group, and only one cell group, i.e. MCG, is used without using dual connectivity, dual connectivity is usually applied in the early stages of 5G network distribution, so that more typical scenarios are that only 5G networks are connected, i.e. only one cell group, i.e. only one MAC entity, how to reduce data interruption at handover is an important problem, and more particularly how to reduce the influence of cell handover on data transmission at the MAC sublayer is a problem to be solved.

The present application provides a solution to the above-mentioned problems.

It should be noted that, in the case of no conflict, the embodiments of any node of the present application and the features in the embodiments may be applied to any other node. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict. Meanwhile, the method provided by the application can also be used for solving other problems in communication, such as NR evolution and 6G system.

As an embodiment, the term (Terminology) in the present application is explained with reference to the definition of the 3GPP specification protocol TS38 series.

As an embodiment, the term in the present application is explained with reference to the definition of the 3GPP specification protocol TS37 series.

The application discloses a method used in a first node of wireless communication, comprising the following steps:

The method comprises the steps of receiving first information, wherein the first information indicates a first MAC entity of the first node to serve a first cell and a second cell, one of the first cell and the second cell is a source cell and the other of the first cell and the second cell is a target cell, and the step of serving the first cell and the second cell comprises the steps of receiving a MAC PDU from the first cell or sending the MAC PDU to the first cell, and receiving the MAC PDU from the second cell or sending the MAC PDU to the second cell.

As an embodiment, the problem to be solved by the application comprises how to reduce the impact of cell handover on data transmission in case of only one MAC entity.

As an embodiment, the method has the advantages of smoother switching, better support of LTM, better support of data continuity, better support of service with higher requirements on time delay, better support of inter-CU (inter control unit, between control units) and inter-DU (INTER DATA unit, between data units), reduced complexity of the system and reduced network load.

Specifically, according to an aspect of the present application, the first information indicates that the second cell is added to the cell group to which the first cell belongs and a deactivated state is maintained;

The second cell is activated after the cell switching is started, and the first cell is deactivated or released when the cell switching is completed.

Specifically, according to an aspect of the present application, the first information indicates a reset uplink HARQ process of the first node.

In particular, according to one aspect of the application, the first cell and the second cell are a source cell and a target cell in an LTM procedure other than RACH.

Specifically, according to one aspect of the application, a first signaling and a second signaling are received, wherein the first signaling comprises a first parameter and at least one candidate configuration, the at least one candidate configuration comprises a first candidate configuration comprising a second parameter, and the second signaling indicates the first candidate configuration and a cell handover;

Wherein the serving first cell and second cell rely on the second parameter being equal to the first parameter; the first signaling is signaling of an RRC sublayer and the second signaling is MAC CE.

In particular, according to one aspect of the application, the serving first cell and the second cell are running in dependence of a first timer.

Specifically, according to one aspect of the application, a first timer is started along with the receiving of the first information, and expiration of the first timer triggers the RRC connection reestablishment, and the stopping of the first timer triggers the first MAC entity to serve only one of the first cell and the second cell.

Specifically, according to one aspect of the present application, a first MAC CE is received;

wherein the first MAC entity indicates to a higher layer whether the first MAC CE is received from a first cell or a second cell.

Specifically, according to one aspect of the present application, the serving first and second cells includes MAC subPDU receiving logical channel identity associations SRB from the first and second cells, MAC subPDU receiving logical channel identity associations MAC CEs from only one of the first and second cells.

Specifically, according to one aspect of the present application, third signaling is received, where the third signaling configures a first RLC bearer of a first cell and a second RLC bearer of a second cell, where the first RLC bearer of the first cell serves SRB1 of the first cell, the second RLC bearer of the second cell serves SRB1 of the second cell, and the serving the first cell and the second cell includes serving both SRB1 of the first cell and the second cell SRB1.

Specifically, according to one aspect of the present application, the serving the first cell and the second cell includes communicating with the first cell over a first radio bearer and communicating with the second cell over a second radio bearer, the first radio bearer and the second radio bearer being respectively associated with different security contexts.

Specifically, according to an aspect of the present application, the first node is an internet of things terminal.

In particular, according to one aspect of the application, the first node is a user equipment.

Specifically, according to one aspect of the present application, the first node is a vehicle-mounted terminal.

Specifically, according to one aspect of the present application, the first node is a mobile phone.

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

The first receiver receives first information, wherein the first information indicates a first MAC entity of the first node to serve a first cell and a second cell, one of the first cell and the second cell is a source cell and the other is a target cell, and the serving the first cell and the second cell comprises receiving a MAC PDU from the first cell or sending a MAC PDU to the first cell, and receiving a MAC PDU from the second cell or sending a MAC PDU to the second cell.

As an embodiment, the present application has the following advantages over the conventional scheme:

The difference between LTM (L1L 2 TRIGGERED MOBILITY, layer 1 layer 2 triggered mobility) and traditional cell switching is that the time delay is shorter, especially the non-RACH LTM cell switching and the RACH-based LTM cell switching are mainly different in that the non-RACH LTM is not used, RACH process is not needed, the time delay of the LTM cell switching is further shortened, and RACH-based LTM cell switching needs RACH process. However, interruption of the MAC sub-layer in communication weakens the advantage of the LTM, and the application is beneficial to fully exerting the advantage of the LTM and reducing the switching delay.

A good balance between network complexity and handover performance is facilitated.

Cell switching between inter-CU and inter-DU can be better supported.

It can be accurately determined whether or not to allow simultaneous communication with the first cell and the second cell during handover.

When supporting HARQ, it is difficult to transfer between different network processing units because the data in the buffer is very large, and the proposed method is advantageous to solve this problem.

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 in which:

FIG. 1 shows a schematic diagram of receiving first information according to one embodiment of the application;

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

Fig. 3 shows a schematic diagram of an embodiment of a radio protocol architecture of a user plane and a control plane according to an embodiment of the application;

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

fig. 5 shows a flow chart of wireless signal transmission according to an embodiment of the application;

FIG. 6 shows a flow chart of a first cell and a second cell interaction according to an embodiment of the application;

Fig. 7 is a schematic diagram showing a structure of a MAC PDU according to an embodiment of the present application;

Fig. 8 shows a schematic diagram of the operation of the serving first cell and the second cell in dependence of the first timer according to an embodiment of the application;

fig. 9 illustrates a schematic diagram of a processing device for use in a first node according to an embodiment of the application.

Description of the embodiments

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

Example 1

Embodiment 1 illustrates a flow chart of receiving first information according to one embodiment of the application, as shown in fig. 1. In fig. 1, each block represents a step, and it is emphasized that the order of the blocks in the drawing does not represent temporal relationships between the represented steps.

In embodiment 1, a first node in the present application receives first information in step 101.

Wherein the first information indicates that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, and the serving the first cell and the second cell comprises receiving a MAC PDU from the first cell or sending a MAC PDU to the first cell, receiving a MAC PDU from the second cell or sending a MAC PDU to the second cell.

As an embodiment, the first node is a UE (User Equipment).

As an embodiment, the first node is a terminal.

As one example, it will be understood by those skilled in the art that the source cell and the target cell refer to the source cell and the target cell during a handover.

As one embodiment, the LTM cell switch (CELL SWITCH) is a cell switch triggered by L1/L2 signaling.

Any operation performed at the MAC sublayer may also be understood or referred to as any operation performed by the MAC entity, as an embodiment.

As one embodiment, the lower layer when the MAC sublayer performs operations is the physical layer.

As one embodiment, the higher layers when the MAC sublayer performs operations include an RLC sublayer, an RRC sublayer, a PDCP sublayer.

Typically, the higher layer when the MAC sublayer performs operations is the RRC sublayer.

As an embodiment, the MAC CE is control signaling of the MAC layer, which has the characteristics of high speed but lower reliability than RRC signaling, and RRC signaling has the characteristics of higher reliability but slower speed than the MAC CE, and the RRC signaling cannot replace the MAC CE, and the MAC CE cannot replace the RRC signaling.

As one embodiment, the lower layers when the RRC sublayer performs operations include a physical layer, a MAC layer, an RLC sublayer, and a PDCP sublayer.

As one embodiment, the higher layers when the RRC sub-layer performs operations include a non-access layer.

As one embodiment, higher layer signaling refers to RRC signaling or non-access stratum.

As an embodiment, in the present application, if it is not specifically pointed out to be performed at the MAC sublayer, it is performed at the RRC sublayer.

As an embodiment, the access stratum security of the first node is activated.

AS an embodiment, the Access Stratum (AS) includes a plurality of protocol layers, and for details, reference may be made to embodiment 3.

As an embodiment, the first node is in an RRC connected state.

As an embodiment, any of the parameters in the present application, either configured by the network or generated by the first node, may be generated according to an internal algorithm, e.g. random.

As an example, the timer values in the present application are limited and do not exceed 2560 milliseconds.

As one embodiment, the value of the timer is the run time when the timer is not tampered with.

As an example, the values of any parameter in the present application, including but not limited to the value of a timer, the value of a counter, are limited unless specifically stated.

As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in the present application is 1024 times 65536.

As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in the present application is 65536 or 65535.

As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in the present application is 1024.

As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in the present application is 640 or 320.

As one example, the present application is directed to NR.

As one embodiment, the present application is directed to a wireless communication network for NR evolution.

As an embodiment, the serving cell refers to a cell in which the UE camps. Performing the cell search includes the UE searching for a suitable (subscriber) cell of the selected PLMN (Public land mobile Network ) or SNPN (Stand-alone Non-Public Network), selecting the suitable cell to provide available service, monitoring a control channel of the suitable cell, which is defined as camping on the cell, that is, a camping cell, which is a serving cell of the UE with respect to the UE. Camping on a cell in RRC idle state or RRC inactive state has the advantage that it allows the UE to receive system messages from the PLMN or SNPN, after registration, if the UE wishes to establish an RRC connection or continue a suspended RRC connection, the UE can be achieved by performing initial access on the control channel of the camping cell, the network can page to the UE, so that the UE can receive ETWS (Earthquake and Tsunami WARNING SYSTEM, earthquake tsunami warning system) and CMAS (Commercial Mobile ALERT SYSTEM, commercial mobile warning system) notifications.

As an embodiment, for a UE in RRC connected state without CA/DC (carrier aggregation/dual connectivity ) configuration, only one serving cell includes the primary cell. For UEs in RRC connected state that are CA/DC (carrier aggregation/dual connectivity ) configured, the serving cell is used to indicate the set of cells including the special cell (SpCell, special Cell) and all the secondary cells. The primary cell (PRIMARY CELL) is an MCG (MASTER CELL Group) cell, operating on a primary frequency, on which the UE performs an initial connection establishment procedure or initiates connection re-establishment. For dual connectivity operation, the special cell refers to PCell (PRIMARY CELL ) of MCG or PSCell (PRIMARY SCG CELL ) of SCG (Secondary Cell Group), if not dual connectivity operation, the special cell refers to PCell.

As an example, the frequency at which the SCell (Secondary Cell, slave Cell) operates is the slave frequency.

As an embodiment, the first node is configured with MCG only.

For one embodiment, the individual content of the information element is referred to as a field.

As an example, MR-DC (Multi-Radio Dual Connectivity ) refers to dual connectivity of E-UTRA and NR nodes, or dual connectivity between two NR nodes.

As an embodiment, in MR-DC, the radio access node providing the control plane connection to the core network is a master node, which may be a master eNB, a master ng-eNB, or a master gNB.

As an embodiment, MCG refers to a set of serving cells associated with a primary node, including SpCell, and optionally, one or more scells, in MR-DC.

As an example, PCell is SpCell of MCG.

As one example, PSCell is the SpCell of SCG.

As an embodiment, in MR-DC, the radio access node that does not provide control plane connection to the core network, providing additional resources to the UE, is a slave node. The slave node may be an en-gNB, a slave ng-eNB or a slave gNB.

As an embodiment, in MR-DC, the set of serving cells associated with the slave node is SCG (secondary cell group, slave cell group), including SpCell and, optionally, one or more scells.

As an example, the SpCell is a PCell or the SpCell is a PSCell.

As an embodiment, only the former of the first cell and the second cell belongs to a first cell group, which is one of the MCG or SCG of the first node.

As one embodiment, in the RRC inactive state, no DC is used.

As an example, in RRC inactive state, CA is typically not used.

As an embodiment, the RRC information block refers to an information block (information element) in an RRC message.

As one example, SSB may be referred to as ss\pbch, or SS block.

As one example, L1 is Layer 1 (Layer-1) or the physical Layer.

As an example, L2 is Layer 2 (Layer-2)

As one embodiment, the present application is directed to NR and NR evolving networks, such as 6G networks.

As an embodiment, one RRC information block may include one or more RRC information blocks.

As an embodiment, one RRC information block may not include any RRC information block, but only at least one parameter.

As one embodiment, the radio bearers include at least a signaling radio bearer and a data radio bearer.

As one embodiment, the radio bearer is a service or an interface of a service provided by the PDCP layer to a higher layer.

As a sub-embodiment of this embodiment, the higher layer includes one of RRC sub-layer, NAS, SDAP layer.

As one embodiment, the signaling radio bearer is a service or an interface of a service provided by PDCP to a higher layer.

As a sub-embodiment of this embodiment, the higher layer includes an RRC sub-layer, at least the former of the NAS.

As one example, the data radio bearer is a service or an interface of a service provided by PDCP to a higher layer.

As a sub-embodiment of this embodiment, the higher layer includes an SDAP layer, at least the former of NAS.

As one embodiment, after the first node establishes an RRC connection with the network, the first node enters an RRC connected state.

As a sub-embodiment of this embodiment, the network is a Radio Access Network (RAN).

As an embodiment, the first node is in an RRC idle state after the first node has not established an RRC connection with the network.

As one embodiment, the first node enters an RRC inactive state after the first node has suspended establishing an RRC connection with the network.

As an embodiment, different functions are supported in different RRC states.

As an example, only very limited functionality is supported in the non-RRC connected state.

As an embodiment, the non-RRC connected state is or includes an RRC idle state.

As an embodiment, the non-RRC connected state is or includes an RRC inactive state.

As an embodiment, the first node is not in a limited service mode.

As an embodiment, the method and the scenario based on which the present application is proposed are not directed to emergency services.

As an embodiment, the first cell and the second cell are each a serving cell of the first node,

As an embodiment, the first cell is a source cell.

As an embodiment, the second cell is a target cell.

As an embodiment, the first information is RRC signaling.

As an embodiment, the RRC signaling is RRC reconfiguration signaling.

As an embodiment, the RRC reconfiguration information is RRCReconfiguration.

As an embodiment, the first information is an indication of higher layers to the MAC sublayer.

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

As an embodiment, the first cell and the second cell do not belong to the same DU.

As an embodiment, the first cell and the second cell do not belong to the same CU.

As an embodiment, the first cell and the second cell are not synchronized.

As an embodiment, one advantage of the proposed method is that it is suitable for inter-CU, or inter-DU cell handover, including LTM cell handover.

As an embodiment, the first cell and the second cell are a source cell and a target cell in LTM procedure other than RACH.

As an embodiment, there is an additional need to further reduce the handover delay in LTMs other than RACH.

As an embodiment, the serving the first cell and the second cell refers to supporting simultaneous serving of the first cell and the second cell.

As an embodiment, the serving first cell and the second cell refer to maintaining a connection relationship with the first cell and the second cell at the same time.

As an embodiment, when the first cell and the second cell are served at the same time, if a first MAC entity of the first node receives a MAC PDU, the MAC PDU may be of the first cell or of the second cell.

As an embodiment, the serving first cell and the second cell are not serving one cell before the other.

As an embodiment, the serving the first cell and the second cell refers to when one of the first cell and the second cell is served, the other of the first cell and the second cell may also be served.

As an embodiment, a part of HARQ processes of the first MAC entity serve the first cell, and another part of HARQ processes serve the second serving cell.

As an embodiment, the first information is information received from a higher layer by the MAC sublayer.

As a sub-embodiment of this embodiment, the higher layer comprises an RRC sub-layer.

As a sub-embodiment of this embodiment, the higher layer comprises a non-access layer.

As a sub-embodiment of this embodiment, the RRC sublayer of the first node receives the network signaling, and triggers the RRC sublayer of the first node to send the first information to the MAC sublayer.

As a sub-embodiment of this embodiment, the first information is received indicating that the negotiation between the first cell and the second cell is completed.

As a sub-embodiment of this embodiment, the first information is received, indicating that the first node received a configuration for supporting simultaneous serving of the first cell and the second cell.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a configuration of a MAC sublayer.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a configuration of radio bearers.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a configuration of RLC bearers.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a configuration of an identity of the first node.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a security configuration of the first node.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a configuration of logical channel identities of the first node.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises a PUCCH (physical uplink control channel) configuration of the first node at the first cell and the second cell, respectively.

As an embodiment, the first information indicates that the first MAC entity suspends or releases a configuration that results in a collision in communications with the first cell and the second cell.

As a sub-embodiment of this embodiment, the conflicting configuration includes a carrier or frequency configuration.

As a sub-embodiment of this embodiment, the conflicting configuration includes a configuration of the transceiver.

As a sub-embodiment of this embodiment, the conflicting configuration includes a configuration of spatial parameters.

As a sub-embodiment of this embodiment, the conflicting configurations include MIMO (multiple in multiple out, multiple input multiple output) configurations.

As an embodiment, the first information instructs the first MAC entity to stop performing the inter-frequency measurements configured by the first cell.

As a sub-embodiment of this embodiment, the above method has the advantage that interference caused by the inter-frequency measurements configured by the first cell to the serving second cell can be avoided.

As an embodiment, the configuration for supporting simultaneous serving of the first cell and the second cell comprises serving the first cell with one transceiver and serving the second cell with another transceiver.

As an embodiment, the first information indicates that a candidate configuration is used during simultaneous serving of the first cell and the second cell.

As an embodiment, the first node stops using the candidate configuration when the first cell is out of service.

As one embodiment, the candidate configuration is a pre-selected configuration.

As one embodiment, the candidate configuration is a configuration stored after receipt.

As an embodiment, the candidate configuration is a temporary configuration.

As an embodiment, using the candidate configuration facilitates temporarily serving both the first cell and the second cell at the same time, avoiding collisions.

As an embodiment, the first information indicating that the first MAC entity of the first node serves a first cell and a second cell has a meaning comprising that the first information indicates that a condition that the first MAC entity of the first node serves the first cell and the second cell has been met.

As an embodiment, the first information indicating the meaning of the first MAC entity of the first node to serve a first cell and a second cell comprises the first information indicating that the first MAC entity of the first node needs or allows to serve the first cell and the second cell.

As an embodiment, the first information indicating the meaning of the first MAC entity of the first node to serve a first cell and a second cell comprises the first information indicating to the first MAC entity of the first node configuration information for serving the first cell and the second cell.

As one embodiment, the receiving or transmitting a MAC PDU from or to the first cell includes receiving a MAC PDU from or to the first cell and receiving a MAC PDU from or to the second cell.

As an embodiment, the receiving the MAC PDU from or transmitting the MAC PDU to the first cell, and the receiving the MAC PDU from or transmitting the MAC PDU to the second cell include: receiving a MAC PDU from the first cell and transmitting a MAC PDU to the second cell.

As an embodiment, the receiving the MAC PDU from or transmitting the MAC PDU to the first cell, and the receiving the MAC PDU from or transmitting the MAC PDU to the second cell include: transmitting and receiving MAC PDUs to and from the first cell.

As one embodiment, the receiving or transmitting a MAC PDU from or to the first cell includes transmitting a MAC PDU to or from the first cell and a MAC PDU to or from the second cell.

The receiving a MAC PDU from the first cell, as one embodiment, includes receiving the MAC PDU using a configuration of the first cell.

The receiving of the MAC PDU from the second cell, as one embodiment, includes receiving the MAC PDU using a configuration of the second cell.

The receiving a MAC PDU from the first cell, as one embodiment, includes receiving the MAC PDU on a resource of the first cell.

The receiving a MAC PDU from the second cell, as one embodiment, includes receiving the MAC PDU on resources of the second cell.

As one embodiment, the transmitting the MAC PDU to the first cell includes transmitting the MAC PDU using a configuration of the first cell.

As one embodiment, the transmitting the MAC PDU to the second cell includes transmitting the MAC PDU using a configuration of the second cell.

As one embodiment, the transmitting the MAC PDU to the first cell includes transmitting the MAC PDU according to a schedule of the first cell.

As one embodiment, the transmitting the MAC PDU to the second cell includes transmitting the MAC PDU according to a schedule of the second cell.

As an embodiment, the first node has only one MAC entity.

As an embodiment, the first MAC entity of the first node receives or transmits a first type MAC PDU from or to the first cell.

As an embodiment, the first MAC entity of the first node receives or transmits a second type MAC PDU from or to the second cell.

As an embodiment, the size of any MAC PDU in the second type MAC PDU does not exceed a certain threshold.

As an embodiment, the above method has the advantage that both communication with the second cell is guaranteed and excessive resources are avoided being occupied by the communication of the second cell.

As an embodiment, the first type of MAC PDU includes a MAC PDU carrying a MAC CE.

As an embodiment, the second type MAC PDU does not include a MAC PDU carrying a MAC CE.

As an embodiment, the first type MAC PDU and the second type MAC PDU each include a MAC PDU carrying a MAC SDU.

As an embodiment, the first type MAC PDU and the second type MAC PDU each include a MAC PDU carrying a MAC SDU of an SRB (SIGNALING RADIO BEARER ).

As an embodiment, the first type MAC PDU and the second type MAC PDU each include a MAC PDU carrying a MAC SDU of a DRB (data radio bearer ).

As one embodiment, only one of the first type of MAC PDU and the second type of MAC PDU carries a MAC PDU of a MAC SDU of an MRB (Multicast broadcast service radio bearer, multicast broadcast data radio bearer).

As an embodiment, the first type of MAC PDU comprises at least one MAC PDU not belonging to the second type of MAC PDU.

As an embodiment, the first type MAC PDU and the second type MAC PDU are different.

As an embodiment, the first type MAC PDU and the second type MAC PDU are not orthogonal.

As an embodiment, the advantage of supporting different classes of MAC PDUs in communication with the first cell and the second cell, respectively, includes that it is possible to guarantee that two cells are served as much as possible while avoiding collisions and interference when communicating with both cells.

As an embodiment, the first information indicates that the second cell is added to the cell group to which the first cell belongs and remains in a deactivated state.

As an embodiment, the second cell is activated after a cell handover is started.

As an embodiment, the first cell is deactivated or released upon completion of the cell handover.

As an embodiment, the above method has the advantage that collisions in serving the first cell and the second cell simultaneously can be avoided and implementation complexity can be reduced.

As an embodiment, the first cell is MCG when the cell group is.

As an embodiment, the second cell is joined to the cell group of the first cell and is configured with at least one of radio bearers, RLC bearers.

As an embodiment, the second cell is added to the cell group of the first cell with parameters configured for configuration of the MAC layer and the physical layer.

As an embodiment, during simultaneous serving of the first cell and the second cell, both the first cell and the second cell are PCell of the first node.

As an embodiment, during simultaneous serving of the first cell and the second cell, both the first cell and the second cell are serving cells of the first node.

As an embodiment, during simultaneous serving of the first cell and the second cell, one of the first cell and the second cell is a degraded PCell.

As an embodiment, the execution of the cell handover triggers the second cell to be activated.

As an embodiment, completion of a cell handover triggers the first cell to be deactivated or released.

As an embodiment, the first MAC entity copies the buffer in communication with the first cell to the buffer in communication with the second cell when the handover is completed.

As one embodiment, the first MAC timer is a timer when the first MAC entity of the first node communicates with the first cell, and when the handover is completed, the first MAC entity starts a timer that is the same name as the first MAC timer and communicates with the second cell, and sets a value to a remaining time of the first MAC timer.

As a sub-embodiment of this embodiment, the first MAC timer is in an active state during the handover.

As an embodiment, the above method has the advantage that the handover is made smoother.

As an embodiment, the first information indicates a reset uplink HARQ process of the first node.

As an embodiment, the reset uplink HARQ process is an uplink HARQ process with a reset number of transmissions.

As an embodiment, the uplink HARQ process that is reset is an uplink HARQ (Hybrid Automatic Repeat Request) process whose redundancy version is reset.

As an embodiment, the uplink HARQ process that is reset is a HARQ process whose reception and/or transmission buffer is emptied.

As an embodiment, the uplink HARQ process that is reset is a HARQ process that is considered to reach a maximum number of transmissions.

As an embodiment, the first MAC entity determines NDI (new data indicator, new data transmission) rollover when receiving a first scheduling indication for the uplink HARQ process that is being reset.

As an embodiment, the first MAC entity determines NDI rollover when receiving scheduling information of HARQ process numbers for the uplink HARQ process.

As a sub-embodiment of this embodiment, the scheduling information is first scheduling information of HARQ process numbers for the uplink HARQ process after receiving the first information.

As one embodiment, receiving the first information triggers flipping a value of an NDI field in scheduling information associated with a HARQ process number of a reset uplink HARQ process indicated by the first information.

As a sub-embodiment of this embodiment, the associated scheduling information refers to scheduling information scheduled for the associated HARQ process number.

As one embodiment, receiving the first information triggers flipping a value of NDI associated with a HARQ process number of the reset uplink HARQ process indicated by the first information.

As a sub-embodiment of this embodiment, the scheduling information for scheduling the HARQ process number associated with the reset uplink HARQ process indicates a value of NDI.

As a sub-embodiment of this embodiment, the first MAC entity determines whether the NDI value is flipped based on the scheduling information indication.

As an embodiment, the benefits of the above method include that resetting the uplink HARQ process can be avoided.

As an embodiment, the number of HARQ processes supported by the first node is configurable.

As an embodiment, the number of HARQ processes supported by the first node is not less than 8.

As an embodiment, the number of HARQ processes supported by the first node is not less than 16.

As an embodiment, the first node has no more than 4 uplink HARQ processes that are not reset.

As an embodiment, the first node has no more than 2 uplink HARQ processes that are not reset.

As an embodiment, the first node has no more than 1 uplink HARQ process that is not reset.

As an embodiment, the first information implicitly indicates that the target cell will continue with an unresolved HARQ process of the HARQ processes of the first node.

As an embodiment, only part of the HARQ processes of the first node are reset.

As an embodiment, the first cell delivers the data of the uplink HARQ process of the first node that is not reset to the second cell.

As an embodiment, the data of the uplink HARQ process that is not reset includes data in a HARQ buffer.

As an embodiment, in the above method, only partial reset of the uplink HARQ process has the advantage that the continuity and complexity of communication, including network load overhead, can be well balanced during cell handover.

As an embodiment, the first information is based on signaling of the first cell.

As an embodiment, the first cell determines whether to reset the uplink HARQ process according to the reception situation of the ongoing HARQ process.

As an embodiment the reception situation comprises a signal to noise ratio of the already received data.

As an embodiment the reception situation comprises a bit error rate of already received data.

As an embodiment, the reception situation comprises the number of HARQ transmissions that have been received.

As an embodiment, the reception situation comprises a redundancy version of an already received HARQ transmission.

As an embodiment, the network may determine whether to reset the threshold of the uplink HARQ process according to the reception situation according to long-term statistics or simulation.

As an embodiment, the network may determine which uplink HARQ processes to reset based on current network load conditions, e.g., load conditions of the communication link between the first cell and the second cell.

As an embodiment, the network may determine whether to reset each uplink HARQ process based on the amount of data buffered in that uplink HARQ process.

As an embodiment, the first information indicates that at least one downlink HARQ process of the first node is reset.

As an embodiment, the meaning that at least one downlink HARQ process of the first node is reset includes resetting the number of retransmissions of the at least one downlink HARQ process.

As an embodiment, the meaning that at least one downlink HARQ process of the first node is reset comprises resetting a redundancy version of the at least one downlink HARQ process.

As an embodiment the meaning that at least one downlink HARQ process of the first node is reset does not include clearing the buffer of the at least one downlink HARQ process.

As an embodiment, the above method has the advantages of increasing the reliability of data reception during handover, reducing delay, avoiding RLC retransmission, and triggering radio link failure when the maximum RLC retransmission number is reached.

As an embodiment, in a non-RACH LTM cell handover, the RLC bearer of the first cell is not re-established or reset.

As an embodiment, in a non-RACH LTM cell handover, the PDCP of the first cell is not re-established or reset.

As one embodiment, the serving the first cell and the second cell includes communicating with the first cell over a first radio bearer and communicating with the second cell over a second radio bearer, the first radio bearer and the second radio bearer each being associated with a different security context.

As an embodiment, the different security contexts comprise different keys.

As an embodiment, the above method has the advantage of better supporting cell handover between inter-CUs, inter-DUs.

As an embodiment, the cell handover performed by the first node does not comprise resetting the first MAC entity.

In one embodiment, the partially resetting the first MAC entity with the receiving the first information includes resetting the first MAC entity prior to serving the first cell and the second cell.

In one embodiment, said partially resetting said first MAC entity with said receiving first information includes serving only one of said first cell and said second cell upon resetting said first MAC entity.

As a sub-embodiment of this embodiment, the serving one of the first cell and the second cell is the first cell, and the first cell is a source cell.

As an embodiment, the above method has the advantage of reducing the impact of a cell handover on serving the first cell and the second cell.

Example 2

Embodiment 2 illustrates a schematic diagram of a network architecture according to the present application, as shown in fig. 2.

Fig. 2 illustrates a diagram of a network architecture 200 of a 5g nr, LTE (Long-Term Evolution) and LTE-a (Long-Term Evolution Advanced, enhanced Long-Term Evolution) system. The 5G NR or LTE network architecture 200 may be referred to as 5GS (5G System)/EPS (Evolved PACKET SYSTEM) 200, or some other suitable terminology. The 5GS/EPS200 may include one or more UEs (User Equipment) 201, ng-RAN (next generation radio access network) 202,5GC (5G Core Network)/EPC (Evolved Packet Core, evolved packet core) 210, hss (Home Subscriber Server )/UDM (Unified DATA MANAGEMENT) 220, and internet service 230. The 5GS/EPS may interconnect with other access networks, but these entities/interfaces are not shown for simplicity. As shown, 5GS/EPS provides packet switched services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this disclosure 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 termination towards the UE 201. The gNB203 may be connected to other gnbs 204 via an Xn interface (e.g., backhaul). The gNB203 may 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 node), or some other suitable terminology. The gNB203 provides the UE201 with an access point to the 5GC/EPC 210. Examples of UE201 include a cellular telephone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a non-terrestrial base station communication, a satellite mobile communication, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, an drone, an aircraft, a narrowband internet of things device, a machine-type communication device, a land-based vehicle, an automobile, a wearable device, or any other similar functional device. Those of skill in the art may also refer to the UE201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication 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. gNB203 is connected to 5GC/EPC210 through an S1/NG interface. the 5GC/EPC210 includes MME (Mobility MANAGEMENT ENTITY )/AMF (Authentication MANAGEMENT FIELD, authentication management domain)/SMF (Session Management Function ) 211, other MME/AMF/SMF214, S-GW (SERVICE GATEWAY, serving Gateway)/UPF (User Plane Function), 212, and P-GW (PACKET DATE Network Gateway)/UPF 213. the MME/AMF/SMF211 is a control node that handles signaling between the UE201 and the 5GC/EPC 210. In general, the MME/AMF/SMF211 provides bearer and connection management. All user IP (Internet Protocal, internet protocol) packets are transported through the S-GW/UPF212, which S-GW/UPF212 itself is connected to the P-GW/UPF213. The P-GW provides UE IP address assignment as well as other functions. The P-GW/UPF213 is connected to the internet service 230. Internet services 230 include operator-corresponding internet protocol services, which may include, in particular, the internet, intranets, IMS (IP Multimedia Subsystem ) and packet-switched streaming services.

As an embodiment, the first node in the present application is UE201.

As an embodiment, the base station of the second node in the present application is the gNB203.

As an embodiment, the radio link from the UE201 to the NR node B is an uplink.

As an embodiment, the radio link from the NR node B to the UE201 is a downlink.

As an embodiment, the UE201 includes a mobile phone.

As an embodiment, the UE201 is a dedicated device or a special device having a communication function.

As one example, the gNB203 is a Micro Cell (Micro Cell) base station.

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

As an embodiment, the gNB203 is a base station used in a home network.

As an embodiment, the gNB203 is a base station used in a private network.

As one embodiment, the gNB203 is a base station used in an enterprise network.

Example 3

Embodiment 3 shows a schematic diagram of an embodiment of a radio protocol architecture of a user plane and a control plane according to the application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, fig. 3 shows the radio protocol architecture for a first node (UE, gNB) and a second node (gNB, UE), or the control plane 300 between two UEs, layer 1, layer 2 and layer 3, with three layers. 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 links between the first node and the second node and the two UEs through PHY 301. The L2 layer 305 includes a MAC (Medium Access Control ) sublayer 302, an RLC (Radio Link Control, radio link layer control protocol) sublayer 303, and a PDCP (PACKET DATA Convergence Protocol ) sublayer 304, which terminate at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by ciphering the data packets and handover support for the first node between 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 first nodes. 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 (PC 5 SIGNALING PROTOCOL ) sublayer 307 is responsible for the processing of the signaling protocol of the PC5 interface. The radio protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer), the radio protocol architecture for the first node and the second node 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 data packets to reduce radio transmission overhead. Also included in the L2 layer 355 in the user plane 350 is an SDAP (SERVICE DATA Adaptation Protocol ) sublayer 356, the SDAP sublayer 356 being responsible for mapping between QoS flows and data radio bearers (DRBs, data Radio Bearer) to support diversity of traffic. SRBs may be considered as services or interfaces provided by the PDCP layer to higher layers, e.g., RRC sublayers. In the NR system, the SRBs include SRB1, SRB2, and SRB3, which are used to transmit different types of control signaling, respectively. SRB is a bearer between the UE and the access network for transmitting control signaling including RRC signaling between the UE and the access network. SRB1 is of particular interest for UEs, where after each UE establishes an RRC connection, there is SRB1 for transmitting RRC signaling, most of the signaling is transmitted through SRB1, and if SRB1 is interrupted or unavailable, the UE must perform RRC reestablishment. SRB2 is typically used only for transmitting NAS signaling or security related signaling. The UE may not configure SRB3. In addition to emergency services, the UE must establish an RRC connection with the network for subsequent communications. Although not shown, the first node may have several upper layers above the L2 layer 355. Further included are a network layer (e.g., IP layer) terminating at the P-GW on the network side and an application layer terminating at the other end of the connection (e.g., remote UE, server, etc.). The protocol layer may also be referred to as a protocol sub-layer. Fig. 3 shows a general protocol layer structure, and a node used in the present application may lack part of the protocol layer.

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

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

As an embodiment, the first information in the present application is generated in the MAC302 or the RRC306.

As an embodiment, the at least one candidate configuration in the present application is generated in RRC306.

As an embodiment, the first signaling in the present application is generated in RRC306.

As an embodiment, the second signaling in the present application is generated in MAC302.

As an embodiment, the third signaling in the present application is generated in the MAC302.

As an embodiment, the first MAC CE in the present application is generated in the MAC302.

Example 4

Embodiment 4 shows a schematic diagram of a first communication device and a second 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 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 an antenna 452.

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 an antenna 420.

In the transmission from the second communication device 410 to the first communication device 450, upper layer data packets from the core network are provided to a controller/processor 475 at the second communication device 410. The controller/processor 475 implements the functionality of the L2 (Layer-2) Layer. In the transmission from the second communication device 410 to the first communication device 450, a controller/processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller/processor 475 is also responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., physical layer). Transmit processor 416 performs coding and interleaving to facilitate Forward Error Correction (FEC) at the second communication device 410, as well as mapping of signal clusters 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 digitally space-precodes the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. A transmit processor 416 then maps each spatial stream to a subcarrier, 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 a physical channel carrying the time domain multicarrier symbol stream. 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 multiple antenna transmit processor 471 to a radio frequency stream and then provides it to a different antenna 420.

In a transmission from the second communication device 410 to the first communication device 450, each receiver 454 receives a signal at the first communication device 450 through its respective antenna 452. Each receiver 454 recovers information modulated onto a radio frequency carrier and converts the radio frequency stream into a baseband multicarrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various signal processing functions for 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. The receive processor 456 converts the baseband multicarrier symbol stream after receiving the analog precoding/beamforming operation from the time domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive processor 456, wherein the reference signal is to be used for channel estimation, and the data signal is subjected to multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in a receive processor 456 and soft decisions are generated. A receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals that were transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller/processor 459. The controller/processor 459 implements the functions of 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 the transmission 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, decryption, header decompression, control signal processing to recover upper layer data packets from the core network. The upper layer packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

In the transmission from the first communication device 450 to the second communication device 410, a data source 467 is used at the first communication device 450 to provide upper layer data packets to a controller/processor 459. Data source 467 represents all protocol layers above the L2 layer. Similar to the transmit functions at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller/processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations, implementing L2 layer functions for the user and control planes. 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, and digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming, with the multi-antenna transmit processor 457 performing digital multi-antenna spatial precoding, after which the transmit processor 468 modulates the resulting spatial stream into a multi-carrier/single-carrier symbol stream, which is analog precoded/beamformed in the multi-antenna transmit processor 457 before being provided to the different antennas 452 via the transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream and provides it to an antenna 452.

In the transmission from the first communication device 450 to the second communication device 410, the function at the second communication device 410 is similar to the receiving function at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives radio frequency signals through its corresponding antenna 420, converts the received radio frequency signals 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 multi-antenna receive processor 472 collectively implement the functions of the L1 layer. The controller/processor 475 implements L2 layer functions. The controller/processor 475 may be associated with a memory 476 that stores program codes and data. Memory 476 may be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, a controller/processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover upper layer data packets from the UE 450. Upper layer packets from the controller/processor 475 may be provided to the core network.

As an 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, receive at least first information indicating that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, the serving the first cell and the second cell comprising receiving a MAC PDU from the first cell or transmitting a MAC PDU to the first cell, receiving a MAC PDU from the second cell or transmitting a MAC PDU to the second cell.

As one embodiment, the first communication device 450 includes a memory storing a program of computer readable instructions that, when executed by at least one processor, cause actions including receiving first information indicating that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, the serving the first cell and the second cell including receiving a MAC PDU from the first cell or transmitting a MAC PDU to the first cell, receiving a MAC PDU from the second cell or transmitting a MAC PDU to the second cell.

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

As an embodiment, 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.

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

As an embodiment, the second communication device 450 is a relay.

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

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the at least one candidate configuration.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the first signaling.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the second signaling.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the third signaling.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the first information.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used in the present application to receive the first MAC CE.

As one example, a transmitter 454 (including an antenna 452), a transmit processor 468 and a controller/processor 459 are used in the present application to transmit a second MAC CE.

Example 5

Embodiment 5 illustrates a wireless signal transmission flow diagram according to one embodiment of the application, as shown in fig. 5. In fig. 5, U01 corresponds to the first node of the present application, and it is specifically illustrated that the order in this example does not limit the signal transmission order and the order of implementation in the present application, where the steps in F51 and F52 are optional.

For the first node U01, the first signaling is received in step S5101, the second signaling is received in step S5102, the first information is received in step S5103, the cell handover is performed in step S5104, the first MAC entity serves the first cell and the second cell in step S5105, the first MAC CE is received in step S5106, the cell handover is completed in step S5107, and the first MAC entity serves the second cell in step S5108.

For the second node U02, the first signaling is sent in step S5201, the second signaling is sent in step S5202, and the first information is sent in step S5203.

In embodiment 5, the first information indicates that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, and the serving the first cell and the second cell includes receiving a MAC PDU from the first cell or transmitting a MAC PDU to the first cell, receiving a MAC PDU from the second cell or transmitting a MAC PDU to the second cell.

As an embodiment, the second node U02 is a base station corresponding to a PCell of the first node U01.

As an embodiment, the second node U02 is a serving cell of the first node or a base station corresponding to the serving cell.

As an embodiment, the second node U02 belongs to a cellular network.

As an embodiment, the second node U02 corresponds to a source cell.

As an embodiment, the second signaling U02 is the first cell or a base station corresponding to the first cell.

As an example, the sequence of steps shown in FIG. 5 is a chronological order.

As an embodiment, the second node U02 sends the at least one candidate configuration via the first signaling.

As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that LTM cell handover is supported.

As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that LTM cell handover is supported other than RACH.

As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that UE-based timing advance is supported.

As an embodiment, the first signaling is RRC signaling.

As an embodiment, the first signaling is unicast.

As an embodiment, the second signaling is control signaling of the MAC layer.

As an embodiment, the first signaling comprises a first parameter and at least one candidate configuration.

As an embodiment, the first parameter is for the first cell.

As an embodiment, the first candidate configuration is for the second cell.

As an embodiment, any of the at least one candidate configuration is for a candidate target cell.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure infinite resources of the candidate target cell.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure system information of the candidate target cell.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure the PUCCH of the first node U01 in the candidate target cell.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure the identification of the first node U01 in the candidate target cell.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure a timer of the candidate target cell for detecting a radio link failure.

As an embodiment, any candidate configuration of the at least one candidate configuration is used to configure a beam or spatial parameter of a candidate target cell.

As an embodiment, the at least one candidate configuration comprises a first candidate configuration.

As an embodiment, the first candidate configuration comprises a second parameter.

As an embodiment, the second signaling indicates the first candidate configuration.

As an embodiment, the second signaling indicates a cell handover.

As an embodiment, the second signaling triggers step S5104.

As an example, step S5104 includes setting a value of the second parameter to a value of the first parameter.

As an embodiment, the serving first cell and second cell rely on the second parameter being equal to the first parameter.

As an embodiment, the serving the first cell and the second cell in dependence of the second parameter being equal to the first parameter comprises the first MAC entity serving the first cell and the second cell when the value of the first parameter is equal to the second parameter.

As an embodiment, said serving a first cell and a second cell in dependence of said second parameter being equal to said first parameter comprises said first MAC entity serving only one of said first cell and said second cell when a value of said first parameter is not equal to said second parameter.

As one embodiment, the method has the advantages of effectively controlling the simultaneous service source cell and the candidate target cells, supporting continuous LTM cell switching, reducing signaling overhead and shortening switching time delay.

As an embodiment, the first information is received after step S5102.

As an embodiment, the first information is received before step S5102, and after the second signaling is received, the signaling indicated by the first information is performed.

As an embodiment, the first information is received from the second node U02.

As an embodiment, the first information is triggered or generated by signaling received from the second node U02.

As an embodiment, step S5104 refers to triggering or starting to perform a cell handover.

As an example, step S5104 will last for a certain time, and the procedure of cell handover may be parallel to steps S5105 and/or S5106.

As an example, step S5108 is later than step S5107.

As one embodiment, completing a cell switch triggers the first MAC entity to serve the second cell and no longer serve the first cell.

As an embodiment, the first MAC entity indicates to a higher layer whether the first MAC CE is received from the first cell or from the second cell.

As an embodiment, the first MAC entity indicating to a higher layer includes indicating to an RRC sublayer.

As one embodiment, the benefits of the above method include facilitating support for receiving MAC CEs from both a first cell and a second cell and avoiding interference between the two cells.

As an embodiment, the first MAC CE is received from the second node U02.

As one embodiment, the first MAC CE is received from the second cell.

As one example, the logical channel of the MAC CE is fixed, so it is necessary to indicate to higher layers from which cell it is received, to avoid misoperations.

As an embodiment, the first cell and the second cell independently transmit MAC CEs.

As an embodiment, the first MAC CE is any MAC CE received by the first node during the serving first and second cells.

As an embodiment, during said serving of said first cell and said second cell, said first node receives only a partial type of MAC CE transmitted by said second cell.

As an embodiment, during said serving of said first cell and said second cell, said first node receives only a partial type of MAC CE transmitted by said first cell.

As one example, the benefits of the above approach include reduced complexity.

Example 6

Embodiment 6 illustrates a flow chart of the interaction of a first cell and a second cell according to an embodiment of the application, as shown in fig. 6. In fig. 6, U11 corresponds to a first cell of the present application, and U12 corresponds to a second cell of the present application, and it is specifically illustrated that the order in this example does not limit the order of signal transmission and implementation in the present application.

For the first cell U11, the first configuration information is transmitted in step S6101, and a handover complete instruction is received in step S6102.

For the second cell U12, the first configuration information is received in step S6201, and a handover complete indication is transmitted in step S6202.

As an embodiment, the first configuration information is sent before the first node performs a cell handover.

As an embodiment, the first configuration information is sent before the second signaling.

As an embodiment, the first configuration information is sent before the first signaling.

As an embodiment, the first configuration information is sent after the first signaling.

As an embodiment, the first configuration information is sent through an interface between cells.

As an embodiment, the first configuration information is sent through an interface between radio access networks.

As an embodiment, the first configuration information queries whether the first node is allowed to serve the first cell and the second cell simultaneously.

As an embodiment, the first configuration information indicates that the first node is to be allowed to serve the first cell and the second cell simultaneously.

As an embodiment, the first configuration information indicates frequency information when the second cell communicates with the first node.

As an embodiment, the first configuration information indicates frequency information of the first cell when communicating with the first node.

As an embodiment, the first configuration information indicates a radio bearer when the first cell communicates with the first node.

As an embodiment, the first configuration information indicates an identity of a radio bearer when the first cell communicates with the first node.

As an embodiment, the first configuration information indicates an identity of an RLC bearer when the first cell communicates with the first node.

As an embodiment, the first configuration information indicates an identity of a signaling radio bearer when the first cell communicates with the first node.

As an embodiment, the first configuration information indicates a logical channel identity used when the first cell communicates with the first node.

As an embodiment, the first configuration information indicates a logical channel identification of the first cell to assign to the first node.

As an embodiment, the first configuration information indicates an occupied capability of the first cell when communicating with the first node.

As an embodiment, the first configuration information indicates a desired capability of the second cell to be occupied when communicating with the first node.

As an embodiment, the first configuration information indicates power information of the second cell when it is desired to communicate with the first node.

As an embodiment, the first configuration information indicates power information of the first cell when communicating with the first node.

As an embodiment, the first configuration information indicates resources that are prohibited from being used when the second cell communicates with the first node.

As an embodiment, the first configuration information indicates a configuration that is prohibited from being used when the second cell communicates with the first node.

As an embodiment, the first configuration information indicates a maximum number of HARQ processes when the second cell communicates with the first node.

As an embodiment, the first configuration information indicates an upper limit of resources that can be used by the second cell when communicating with the first node.

As an embodiment, the first configuration information indicates that the second cell may communicate with the first node at a highest bit rate.

As an embodiment, the first configuration information indicates a configuration of a measurement gap when the second cell communicates with the first node.

As one embodiment, the first MAC entity listens for PDCCH during measurement gaps while the first MAC entity is in LTM cell handover other than RACH.

As an embodiment, the first configuration information indicates a search space or PDCCH configuration when the second cell communicates with the first node.

As an embodiment, the first configuration information indicates a PUCCH configuration when the second cell communicates with the first node.

As an embodiment, the communication between the second cell and the first cell indicated by the first configuration information refers to the communication between the first node and the second cell when the first node simultaneously serves the first cell and the second cell.

As an embodiment, the first configuration information indicates a maximum number of scells allowed for the second cell configuration during handover.

As an embodiment, the first configuration information indicates a maximum number of scells used by the first cell during handover.

As an embodiment, the first configuration information indicates a number of deactivated cells used by the first cell during handover.

As an embodiment, the first configuration information indicates a measurement configuration of the first cell configuration.

As an embodiment, sharing the measurement configuration is advantageous in avoiding repeated configuration of measurements, saving resources.

As an embodiment, the first configuration information may include a plurality of sub information.

As an embodiment, the first configuration information indicates whether the first MAC entity is reset.

As an embodiment, the first configuration information indicates whether layer 2 of the first node is reset.

As an embodiment, the first configuration information indicates a recommended COUNT (COUNT).

As an embodiment, the recommended count is an encryption for when the second cell communicates with the first node.

As an embodiment, the first cell stops transmitting to the first node as an indication of reception of the completion of the handover.

As an embodiment, the first cell stops reception from the first node as an indication of reception of a close completion.

As an embodiment, the first cell releases the resources of the first node as an indication of reception of the completion of the handover.

Example 7

Embodiment 7 illustrates a schematic diagram of a structure of a MAC PDU according to one embodiment of the present application, as shown in fig. 7.

Fig. 7 shows, as an embodiment, the structure of a MAC PDU to which the present application is applied.

As an embodiment, the MAC header in one MAC PDU may be missing, i.e. one MAC PDU only comprises at least one MAC sub-PDU (sub-PDU).

As an example, the structure of the MAC PDU of fig. 7 is advantageous for speeding up the processing.

As one embodiment, each MAC sub-PDU includes a MAC sub-header or header of a MAC sub-PDU.

As an embodiment, each MAC sub-PDU may include only a MAC sub-header, or may also include a MAC CE with a size of 0.

As an embodiment, each MAC sub-PDU includes only one MAC CE or one MAC SDU.

As an embodiment, the MAC SDU corresponds to an RLC PDU.

As an embodiment, one MAC PDU carries either the data of the first cell or the data of the second cell.

As an embodiment, the MAC PDU may further comprise padding bits.

As an embodiment, when one MAC sub-PDU is received and carries a MAC CE, the first MAC entity reports to a higher layer, e.g. an RRC sub-layer, whether the received MAC CE is from the first cell or from the second cell.

As an embodiment, the higher layer of the first MAC entity only processes part of the type of MAC CE from the first cell.

As an embodiment, the part type includes deactivating scells or SCGs.

As one embodiment, the portion type includes deactivating PDCP duplication.

As an embodiment, the part type comprises timing advance signaling.

As one embodiment, the first node transmits a second MAC CE during serving the first cell and the second cell in handover.

As an embodiment, the first node transmits only a partial type of MAC CE to the first cell during serving the first cell and the second cell in handover.

As a sub-embodiment of this embodiment, the second MAC CE is only allowed to be the partial type of MAC CE for the first cell.

As an embodiment, the first node transmits only a partial type of MAC CE to the second cell during serving the first cell and the second cell in handover.

As a sub-embodiment of this embodiment, the second MAC CE is only allowed to be the partial type of MAC CE for the second cell.

As an embodiment, during serving of the first cell and the second cell in handover, the partial type of MAC CE transmitted by the first MAC entity to the first cell comprises at least one MAC CE not belonging to the partial type transmitted to the second cell.

As an embodiment, during serving of the first cell and the second cell in handover, the partial type of MAC CE transmitted by the first MAC entity to the second cell comprises at least one MAC CE not belonging to the partial type transmitted to the first cell.

As an embodiment, the above method has the advantage of avoiding interference when two cells communicate, reducing complexity.

As an embodiment, the serving first and second cells include receiving a logical channel identification association, SRB, (SIGNALING RADIO BEARER ) from the first and second cells MAC subPDU, receiving a logical channel identification association, MAC CE, from only one of the first and second cells MAC subPDU.

As an embodiment, the receiving MAC subPDU of the logical channel identity association SRB from the first cell and the second cell includes the first node receiving RRC signaling of the first cell and also receiving RRC signaling of the second cell.

As an embodiment, the receiving a logical channel identification association SRB from the first cell and the second cell comprises one of SRB1, SRB2, SRB3, SRB4, SRB 5.

As an embodiment, said receiving a logical channel identification association, SRB, from said first cell and said second cell means that said logical channel is SRB specific.

As an embodiment, the receiving a logical channel identity association SRB from the first cell and the second cell means that a logical channel identity associated with SRB1 of the first cell is different from a logical channel identity associated with SRB1 of the second cell.

As an embodiment, the receiving the logical channel identifier association SRB from the first cell and the second cell means that the RRC signaling of the first cell is sent to the first node through SRB1, and the RRC signaling of the second cell is sent to the first node through SRB other than SRB 1.

As an embodiment, the receiving the logical channel identifier association SRB from the first cell and the second cell means that the RRC signaling of the first cell is sent to the first node through SRB2, and the RRC signaling of the second cell is sent to the first node through SRB other than SRB 2.

As an embodiment, the receiving the logical channel identifier association SRB from the first cell and the second cell means that the RRC signaling of the first cell is sent to the first node through SRB3, and the RRC signaling of the second cell is sent to the first node through SRB other than SRB 3.

As an embodiment, the above method has the advantage of reducing the complexity of the signaling reception.

As one embodiment, the first node receives MAC subPDU of the logical channel identities associated MAC CEs from only one of the first cell and the second cell.

As an embodiment the meaning of the first node receiving only logical channel identification associated MAC CEs MAC subPDU from one of the first cell and the second cell is that the first node receives only MAC CEs from the first cell and not from the second cell or that the first node receives only MAC CEs from the second cell and not from the first cell.

As an embodiment, the above approach has the benefit of reducing the complexity of the control in the handover.

Example 8

Embodiment 8 illustrates a schematic diagram in which the serving first cell and the second cell are running in dependence of the first timer according to an embodiment of the present application, as shown in fig. 8.

As an embodiment, the serving first cell and the second cell depend on the first timer running in the sense that the first MAC entity serves the first cell and the second cell when the first timer is running.

As an embodiment, the serving first cell and the second cell depend on the first timer running in the sense that the first MAC entity serves one of the first cell and the second cell when the first timer is not running.

As an embodiment, the serving first cell and the second cell rely on the first timer running in the sense that the first timer stops triggering the first MAC entity to stop serving the first cell.

As an embodiment, the serving first cell and the second cell rely on the first timer running in the sense that expiration of the first timer triggers the first MAC entity to stop serving the first cell.

As an embodiment, a first timer is started with said receiving the first information.

As an embodiment, the first timer is started when a cell handover is performed.

As an embodiment, the first timer is stopped when the cell handover is completed.

As an embodiment, the cell handover fails when the first timer expires.

As an embodiment, expiration of the first timer triggers RRC connection reestablishment.

As an embodiment, the stopping of the first timer triggers the first MAC entity to serve only one of the first cell and the second cell.

As one embodiment, the first timer is T304.

As an embodiment, the first timer is T304a.

As an embodiment, the first timer is T304b.

As an embodiment, the first timer is for LTM cell handover.

As an embodiment, the first timer is for LTM cell handover other than RACH.

Example 9

Embodiment 9 illustrates a block diagram of a processing apparatus for use in a first node according to an embodiment of the present application, as shown in fig. 9. In fig. 9, the processing means 900 in the first node comprises a first receiver 901 and a first transmitter 902.

In embodiment 9, a first receiver 1001 receives first information indicating that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell, and the serving the first cell and the second cell comprises receiving a MAC PDU from the first cell or transmitting a MAC PDU to the first cell, receiving a MAC PDU from the second cell or transmitting a MAC PDU to the second cell.

As one embodiment, the first information indicates that the second cell is added to a cell group to which the first cell belongs and keeps a deactivated state;

As an embodiment, the first receiver 1001 receives a first signaling and a second signaling, wherein the first signaling comprises a first parameter and at least one candidate configuration, the at least one candidate configuration comprises a first candidate configuration comprising a second parameter, the second signaling indicates the first candidate configuration and a cell handover;

As an embodiment, the serving first cell and the second cell are running in dependence of a first timer.

As an embodiment, the first receiver 1001 starts a first timer with the receiving of the first information, and the expiration of the first timer triggers RRC connection reestablishment, and the stopping of the first timer triggers the first MAC entity to serve only one of the first cell and the second cell.

As an embodiment, the first receiver 1001 receives a first MAC CE;

As one embodiment, the serving first and second cells includes receiving a logical channel identification association SRB from the first and second cells MAC subPDU, receiving a logical channel identification association MAC CE from only one of the first and second cells MAC subPDU.

As an embodiment, the first receiver 901 receives a third signaling, where the third signaling configures a first RLC bearer of a first cell and a second RLC bearer of a second cell, where the first RLC bearer of the first cell serves SRB1 of the first cell, the second RLC bearer of the second cell serves SRB1 of the second cell, and the serving the first cell and the second cell includes serving both SRB1 of the first cell and SRB1 of the second cell.

As an embodiment, the first node is a User Equipment (UE).

As an embodiment, the first node is a mobile phone.

As an embodiment, the first node is a communication device supporting low latency.

As an embodiment, the first node is an industrial communication device.

As an embodiment, the first node is an internet of things terminal or an industrial internet of things terminal.

As an example, the first receiver 901 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 of example 4.

As one example, the first transmitter 902 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 of example 4.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described methods may be implemented by a program that instructs associated hardware, and the program may be stored on 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 using one or more integrated circuits. Accordingly, each module unit in the above embodiment may be implemented in a hardware form or may be implemented in a software functional module form, and the present application is not limited to any specific 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 airplanes, aircrafts, mini-planes, 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 (ENHANCEDMTC ) 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 devices, and other wireless Communication devices. The base station or system equipment in the present application includes, but is not limited to, wireless communication equipment such as macro cell base stations, micro cell base stations, home base stations, relay base stations, gNB (NR node B) NR node B, TRP (TRANSMITTER RECEIVERPOINT, transmitting and receiving nodes), NTN base stations, satellite equipment, flight platform equipment, and the like.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. Accordingly, the presently disclosed embodiments are considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A first node used for mobility management in wireless communication, comprising:

A first receiver receives first information, wherein the first information indicates that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell; serving the first cell and the second cell includes: receiving a MAC PDU from the first cell or sending a MAC PDU to the first cell, and receiving a MAC PDU from the second cell or sending a MAC PDU to the second cell.

2. The first node according to claim 1, characterized in that:

The first information indicates that the second cell is added to the cell group to which the first cell belongs and remains in a deactivated state;

After the cell switching starts, the second cell is activated; when the cell switching is completed, the first cell is deactivated or released.

3. The first node according to claim 1 or 2, characterized in that:

The first information indicates the reset uplink HARQ process of the first node.

4. The first node according to any one of claims 1 to 3, characterized in that:

The first cell and the second cell are a source cell and a target cell in a non-RACH LTM process.

5. The first node according to any one of claims 1 to 4, characterized in that it comprises: the first receiver, receiving a first signaling and a second signaling, wherein the first signaling comprises a first parameter and at least one candidate configuration, the at least one candidate configuration comprises a first candidate configuration, the first candidate configuration comprises a second parameter, and the second signaling indicates the first candidate configuration and a cell handover; performing the cell handover comprises: setting a value of the second parameter to a value of the first parameter;

The serving first cell and the second cell depend on the second parameter being equal to the first parameter; the first signaling is the signaling of the RRC sublayer, and the second signaling is the MAC CE.

6. The first node according to any one of claims 1 to 5, characterized in that:

The serving first cell and the second cell depend on the first timer being running.

7. The first node according to any one of claims 1 to 6, characterized in that it comprises:

The first receiver starts a first timer along with the reception of the first information, and expiration of the first timer triggers RRC connection reconstruction; stopping of the first timer triggers the first MAC entity to serve only one of the first cell and the second cell.

8. The first node according to any one of claims 1 to 7, characterized in that it comprises:

The first receiver receives a first MAC CE;

The first MAC entity indicates to a higher layer whether the first MAC CE is received from the first cell or the second cell.

9. The first node according to any one of claims 1 to 8, characterized in that:

The serving the first cell and the second cell includes: receiving a MAC subPDU with a logical channel identifier associated with an SRB from the first cell and the second cell, and receiving a MAC subPDU with a logical channel identifier associated with a MAC CE from only one of the first cell and the second cell.

10. A method in a first node for mobility management in wireless communication, comprising:

Receive first information, wherein the first information indicates that a first MAC entity of the first node serves a first cell and a second cell, wherein one of the first cell and the second cell is a source cell and the other is a target cell; serving the first cell and the second cell includes: receiving a MAC PDU from the first cell or sending a MAC PDU to the first cell, and receiving a MAC PDU from the second cell or sending a MAC PDU to the second cell.