CN112789884B

CN112789884B - Cell switching processing method, device and storage medium

Info

Publication number: CN112789884B
Application number: CN201980064502.1A
Authority: CN
Inventors: 唐海
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-03-19
Filing date: 2019-03-19
Publication date: 2023-10-13
Anticipated expiration: 2039-03-19
Also published as: WO2020186464A1; CN112789884A

Abstract

The invention discloses a processing method for cell switching, which comprises the following steps: the terminal equipment receives first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment. The invention also discloses another cell switching processing method, equipment and a storage medium.

Description

Cell switching processing method, device and storage medium

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, and a storage medium for processing cell handover.

Background

In the related art, for a cell handover (conditional handover) based on a condition, a terminal device does not immediately execute the cell handover after receiving a condition handover command; thus, the target network device requires a longer time to maintain and manage the configuration resources that are responsive to the source network device. When the target cell corresponding to the target network device sends an overload, the target network device may preferentially serve other terminal devices in the target cell for some reasons, and decide to cancel the resources and configuration reserved for the terminal device corresponding to the conditional handover command. At this time, how to process the cell handover initiated by the terminal device can reduce the handover delay and improve the success rate of cell handover, and no effective solution exists at present.

Disclosure of Invention

In order to solve the technical problems, embodiments of the present invention provide a processing method, an apparatus, and a storage medium for cell switching, which can reduce switching delay and improve success rate of cell switching when a target network device does not allow access of a terminal device based on conditional switching.

In a first aspect, an embodiment of the present invention provides a method for processing cell handover, including: the terminal equipment receives first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment.

In a second aspect, an embodiment of the present invention provides a method for processing cell handover, including: the network equipment sends first information to the terminal equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment.

In a third aspect, an embodiment of the present invention provides a terminal device, including: the first receiving unit is configured to receive first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment.

In a fourth aspect, an embodiment of the present invention provides a network device, including: the second sending unit is configured to send first information to the terminal equipment, wherein the first information is used for characterizing a first target cell corresponding to the network equipment which is refused to be accessed by the terminal equipment.

In a fifth aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute, when the computer program is running, the steps of a method for processing cell handover executed by the terminal device.

In a sixth aspect, an embodiment of the present invention provides a network device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute, when the computer program is running, the steps of a method for processing cell handover executed by the network device.

In a seventh aspect, an embodiment of the present invention provides a storage medium storing an executable program, where the executable program when executed by a processor implements a method for processing cell handover performed by the terminal device.

In an eighth aspect, an embodiment of the present invention provides a storage medium storing an executable program, where the executable program when executed by a processor implements a method for processing cell handover performed by the network device.

The processing method for cell switching provided by the embodiment of the invention comprises the following steps: the terminal equipment receives first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment. In this way, the network device is enabled to preferentially serve other terminal devices in the target cell for some reasons, and when deciding to cancel resources and configuration reserved for the terminal device corresponding to the conditional access command, the terminal device is notified that the terminal device cannot access the first target cell corresponding to the network device through the first information; the method and the device realize effective management of the conditional switching configuration resources by the network equipment, reduce the times and time of trying to switch access by the terminal equipment under the condition of cell congestion, reduce the switching time delay and improve the success rate of cell switching.

Drawings

Fig. 1 is a schematic flow chart of a cell handover according to the present invention;

fig. 2 is a schematic diagram of a contention-based random access procedure according to the present invention;

FIG. 3 is a schematic diagram of a non-contention based random access procedure according to the present invention;

fig. 4 is a schematic diagram of a random access procedure based on conditional handover according to the present invention;

fig. 5 is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an alternative processing flow of a processing method for cell handover according to an embodiment of the present invention;

FIG. 7 is an alternative schematic diagram of indicating first information by a MAC subheader of an existing MAC PDU according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another alternative embodiment of the present invention for indicating the first information by the MAC subheader of the existing MAC PDU;

fig. 9 is a schematic diagram of a first MAC CE according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a processing flow of cell handover for a non-contention random access procedure according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a process flow of cell handover for a contention random access procedure according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a second MAC CE according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a third MAC CE according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a process flow of cell handover for a contention random access procedure according to an embodiment of the present invention;

Fig. 15 is a schematic diagram of a composition structure of a terminal device according to an embodiment of the present invention;

fig. 16 is a schematic diagram of a composition structure of a network device according to an embodiment of the present invention;

fig. 17 is a schematic diagram of a hardware composition structure of an electronic device according to an embodiment of the present invention.

Detailed Description

So that the manner in which the features and techniques of the embodiments of the present invention can be understood in more detail, a more particular description of the invention, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the present invention.

Before describing the cell switching processing method provided by the embodiment of the present invention in detail, a related art cell switching process and a cell switching processing method after cell switching will be briefly described.

Currently, the 3GPP international standards organization starts developing 5G with the pursuit of speed, delay, high speed mobility, energy efficiency, and diversity and complexity of future life services. The main application scenario of 5G is: enhanced mobile ultra-wideband (Enhance Mobile Broadband, emmbb), low latency high reliability communications (Ultra Reliable Low Latency Communications, URLLC), and large scale machine type communications (Massive Machine Type Communication, mctc).

embbs still target users to obtain multimedia content, services, and data, and their demand is growing very rapidly. On the other hand, since the eMBB may be deployed in different scenarios, such as indoor, urban, rural, etc., the capability and demand of the eMBB are also relatively different, so that detailed analysis must be performed in connection with a specific deployment scenario. Typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety guarantee and the like. Typical characteristics of mctc include: high connection density, small data volume, delay insensitive traffic, low cost and long service life of the module, etc.

Similar to the LTE system, the New wireless (NR) system supports a handover procedure of a connected terminal device. When a terminal device using a network service moves from one cell to another cell, or due to adjustment of radio transmission traffic load, active operation maintenance, equipment failure, etc., the system transfers the communication link between the terminal device and the original cell to the new cell, i.e., performs a handover procedure, in order to ensure continuity of communication and quality of service.

Taking an Xn interface switching process as an example, a cell switching process applicable to an LTE system and an NR system, as shown in fig. 1, is divided into the following three phases:

Stage 1 (including steps 1 to 5), handover preparation: including measurement control and reporting, handover request and acknowledgement

Stage 2 (comprising steps 6 to 8), the handover performs: the terminal device immediately executes the switching process after receiving the switching command, i.e. the terminal device disconnects the source cell and connects with the target cell (e.g. executes random access, sends an RRC switching completion message to the target network device, etc.); and (5) state transition and data forwarding of a Secondary Node (SN).

Stage 3 (comprising steps 9 to 12), the handover is completed: the target cell performs Path switching (Path Switch) with (Acess and Mobility Management Function, AMF) and user plane functions (User Port Function, UPF) releasing the terminal device context of the source network device.

A schematic diagram of a contention-based random access procedure is shown in fig. 2; where Msg1 is an L1 message, msg2 and Msg4 are L2 (media access control (Media Access Control, MAC) layer) messages, and Msg3 is an L3 (RRC layer) or L2 (MAC layer) message. Msg1 and Msg2 do not use HARQ transmissions, whereas Msg3 and Msg4 use hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) transmissions. If one random access attempt fails, the terminal device can initiate the next random access attempt and perform power mapping until the maximum number of retransmissions allowed by the network side is reached. The time for which the random access is successful may be long or short, depending on the number of random access attempts. The difference in the handover procedure is that the terminal device does not terminate the subsequent random access attempt after the maximum RACH retransmission number is reached, and does not announce (reserve) handover failure until T304 times out.

A schematic diagram of a non-contention based random access procedure is shown in fig. 3; where Msg0 and Msg1 are L1 messages and Msg2 is an L2 (MAC layer) message. In the non-contention random access process, the resources of the non-contention random access are acquired through RRC signaling or PDCCH sequence (order). Similar to the contention-based random access procedure, after the non-contention random access fails, the terminal device may initiate the next random access attempt and make a power adjustment (power mapping) until the maximum number of retransmissions allowed by the network device is reached or T304 times out (during the handover procedure).

A brief description of conditional handover follows.

Aiming at the problems of frequent switching and easy failure of switching in the high-speed mobile scene and the high-frequency deployment scene, 3GPP is currently discussed as an introduction conditional handover of LTE and NR systems. As shown in fig. 4, the terminal device performs cell measurement, configuration and reporting with the source network device; the source network equipment and the target network equipment are subjected to switching preparation; and when the terminal equipment meets the triggering condition, switching to the target network equipment. Conditional Handover, by configuring a Handover (HO) command (command) for a terminal device in advance, the problem that the terminal device has passed late when it is to be handed over due to an excessively long Handover preparation time is avoided. And, for the high-speed rail scenario, the running track of the terminal device is specific, so the source network device may allocate the target network device to the terminal device in advance, and the HO command includes a condition for triggering the terminal device to perform handover, and when the allocated condition is satisfied, the terminal device initiates an access request to the target network device. However, in Conditional handover there may be the following problems:

1. The load situation of the target network device has been changed, e.g. has become overloaded, compared to when the handover request was previously responded to.

2. The target network device does not determine whether the terminal device will switch to the cell to which the target network device corresponds (i.e., does not determine whether the terminal device will trigger a handover to the cell), so that the resource priority reserved for the terminal device is lower than the resource priority of the terminal device in other connection modes being served.

3. If the source network device is configured for a plurality of target network devices of the terminal device, it is still possible for the terminal device to switch to a target network device with a lower load, instead of the target network device itself.

However, the existing protocol does not support the target network device to reject the handover, which will cause the terminal device to continuously initiate a random access attempt to the target network device, and eventually cause a cell handover failure, and increase the interruption time of the cell handover.

Based on the above-mentioned problems, the present application provides a method for processing cell handover, and the method for processing cell handover according to the embodiments of the present application may be applied to various communication systems, for example: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) systems, general packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) systems, LTE frequency division duplex (Frequency Division Duplex, FDD) systems, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication systems, or 5G systems, and the like.

An exemplary communication system 100 to which embodiments of the present application may be applied is shown in fig. 5. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area. Alternatively, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. "terminal device" as used herein includes, but is not limited to, a connection via a wireline, such as via a public-switched telephone network (Public Switched Telephone Networks, PSTN), a digital subscriber line (Digital Subscriber Line, DSL), a digital cable, a direct cable connection; and/or another data connection/network; and/or via a wireless interface, e.g., for a cellular network, a wireless local area network (Wireless Local Area Network, WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and/or means of the other terminal device arranged to receive/transmit communication signals; and/or internet of things (Internet of Things, ioT) devices. Terminal devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellites or cellular telephones; a personal communications system (Personal Communications System, PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; a PDA that can include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a global positioning system (Global Positioning System, GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal device may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolved PLMN, etc.

Alternatively, direct terminal (D2D) communication may be performed between the terminal devices 120.

Alternatively, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Fig. 5 illustrates one network device and two terminal devices by way of example, and the communication system 100 may alternatively include multiple network devices and may include other numbers of terminal devices within the coverage area of each network device, as embodiments of the present application are not limited in this regard.

Optionally, the communication system 100 may further include a network controller, a mobility management entity, and other network entities, which are not limited by the embodiment of the present application.

It should be understood that a device having a communication function in a network/system according to an embodiment of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 5 as an example, the communication device may include the network device 110 and the terminal device 120 with communication functions, where the network device 110 and the terminal device 120 may be the specific devices described above, which are not described herein again; the communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present application.

An optional processing flow of the processing method for cell handover provided by the embodiment of the present invention, as shown in fig. 6, includes the following steps:

step S201, a terminal device receives first information sent by a network device, where the first information is used to characterize a first target cell corresponding to the terminal device that is refused to access the network device.

In some embodiments, for a non-contention random access procedure, before performing step S201, the terminal device receives a handover command for conditional handover sent by the source network device, where the handover command for conditional handover includes a dedicated RACH resource (i.e., preamble) configured by the target cell. When the switching condition aiming at the target cell is triggered, the terminal equipment initiates a random access process based on non-competition to the target network equipment, and the target network equipment identifies the terminal equipment as conditional handover terminal equipment through a special preamble, and determines whether to agree with the random access request of the terminal equipment. When the target network equipment determines that the target network equipment is subjected to load congestion according to an algorithm or a strategy of the target network equipment, first information is sent to the terminal equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the target network equipment. Optionally, the target network device sends the first information through Msg2 in the random access procedure.

In the specific implementation, the target network equipment identifies the C-RNTI of the terminal equipment through a special preamble sent by the terminal equipment; when transmitting Msg2, a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) is scheduled by a physical downlink control channel (Physical Downlink Control Channel, PDCCH) scrambled by a C-RNTI, the PDSCH carrying the first information therein. The PDSCH may carry the first information at least through several implementations:

the first implementation way is: the first information is indicated by a MAC sub-header (subheader) of a MAC protocol data unit (Protocol Data Unit, PDU). Optionally, the first bit of the MAC subheader is used to indicate the first information; and when the value corresponding to the first bit is a first value, the terminal equipment is refused to access the first target cell by characterization. The MAC subheader may be a new MAC subheader or reuse an existing MAC subheader. An optional schematic diagram of indicating the first information by using the MAC subheader of the existing MAC PDU is shown in fig. 7, taking MAC subheader with Backoff indicator as an example, using the first reserved R bit to indicate the first information, changing the first R bit into the Rej bit, and setting the value of the first Rej bit to 1, which indicates that the target network device refuses the terminal device to access the first target cell corresponding to the network device. Alternatively, as shown in fig. 8, still taking MAC subheader with Backoff indicator as an example, the second reserved R bit is used to indicate the first information, the second R bit is changed to the Rej bit, and the value of the second Rej bit is set to 1, which indicates that the target network device refuses the terminal device to access the first target cell corresponding to the network device.

In a second implementation, the indication is indicated by a first MAC Control Element (CE) of the MAC PDU. The first MAC CE is a new RACH Rejection MAC CE and a Logical Channel (LC) Identification (ID) is configured for the first MAC CE alone. As shown in fig. 9, the schematic diagram of the first MAC CE indicates the first information by using a second bit (Rej bit) of the first MAC CE, and when the value corresponding to the second bit is a second value, the terminal device is indicated to be denied access to the first target cell. For example, setting the value of the Rej bit to 1 indicates that the target network device refuses the terminal device to access the first target cell corresponding to the network device.

In the first implementation and the second implementation, the MAC PDU is carried in PDSCH scheduled by PDCCH scrambled with a C-RNTI.

In a third implementation, the first information is indicated by a first downlink control signaling (Downlink Control Information, DCI). Optionally, a third bit of the first DCI is used to indicate the first information; and when the value corresponding to the third bit is a third value, indicating that the terminal equipment is refused to access the first target cell. In specific implementation, the first information can be indicated by introducing a new DCI bit into the PDCCH scrambled by the C-RNTI; the new DCI format may be referenced to indicate the first information, or the existing uplink or downlink DCI format may be reused, with the R bit therein to indicate the first information.

For the non-contention random access procedure, when the network device refuses the terminal device to access the first target cell corresponding to the network device, the terminal device immediately terminates the random access procedure for the first target cell (e.g. cancel the subsequent random access attempt). Optionally, when other target cells meet the handover condition, the terminal device selects one of the target cells for access; otherwise, the terminal equipment returns to the source cell; when the terminal equipment returns to the source cell, if the source cell fails in radio link, the terminal equipment triggers an RRC connection reestablishment procedure.

To sum up, for the non-contention random access procedure, as shown in fig. 10, the source network device sends a CHO command to the terminal device, when the CHO condition is satisfied, the terminal device sends an Msg1 to the target network device, and the target network device sends an Msg2 to the terminal device according to its implementation algorithm, and denies the terminal device to access to the target cell corresponding to the target network device through the Msg 2. And stopping HO to the target cell by the terminal equipment, and attempting to access other target cells corresponding to the CHO.

In other embodiments, for the contention random access procedure, before performing step S201, the terminal device receives a handover command for conditional handover sent by the source network device, where the handover command for conditional handover includes a common RACH resource configured by the target cell (i.e., a RACH resource broadcast by the target cell system message). When the switching condition aiming at the target cell is triggered, the terminal equipment initiates a random access process based on competition to the target network equipment, and the target network equipment identifies the terminal equipment as the terminal equipment of conditional handover through the C-RNTI in the Msg3 in the random access process, and then determines whether to agree with the random access request of the terminal equipment. When the target network equipment determines that the target network equipment is subjected to load congestion according to an algorithm of the target network equipment, first information is sent to the terminal equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the target network equipment. Optionally, the target network device sends the first information through Msg4 in the random access procedure.

In a specific implementation, the target network device sends the first information through Msg 4. Optionally, a PDSCH is scheduled through the C-RNTI scrambled PDCCH, where the PDSCH carries the first information. The manner in which the PDSCH carries the first information is the same as the three manners for transmitting the first information shown in fig. 7 to 9 in the non-contention random access procedure, which is not described herein.

Unlike the random access procedure for non-contention, the method for transmitting the first information by the target network device through the Msg4 in the random access procedure for contention includes, in addition to the first implementation manner, the second implementation manner, and the third implementation manner, the method further includes:

in a fourth implementation, the first information is carried by a first RRC message. Alternatively, the first RRC message may be a new RRC message, such as an RRC CHO Reject message. The optional contents of the RRC CHO Reject message are as follows:

in summary, for the contention random access procedure, as shown in fig. 11, the source network device sends a CHO command to the terminal device, when the CHO condition is satisfied, the terminal device sends an Msg1 to the target network device, after Msg2 and Msg3, the target network device discovers the existing C-RNTI MAC CE and RRC reconfiguration complete message in Msg3, identifies the terminal device with the terminal device being conditional handover through the C-RNTI, sends an Msg4 to the terminal device according to the implementation algorithm of the terminal device, and denies the terminal device to access the target cell corresponding to the target network device through Msg 4. And stopping HO to the target cell by the terminal equipment, and attempting to access other target cells corresponding to the CHO.

In still other embodiments, in the random access procedure for contention, the processing procedure of cell handover further includes:

step S202, the terminal device sends information of at least one second target cell to the network device, where the information of the at least one second target cell is used for the network device to select at least one second target cell for the terminal device to access.

In a specific implementation, the information of the at least one second target cell is indicated by a second MAC CE, or the information of the at least one second target cell is carried in a second RRC message. Wherein the information of the second target cell at least includes: physical cell identity (Physical Cell Identifier, PCI) and frequency point; or the information of the second target cell at least comprises the PCI, the frequency point and the number of the second target cell.

When the terminal device indicates the information of at least one second target cell through the second MAC CE, the second MAC CE may be a new CHO target MAC CE, as shown in fig. 12, where the information of at least one second target cell is included, and the information of each second target cell includes a PCI and a frequency point.

When the terminal equipment indicates the information of at least one second target cell through a second RRC message, the second RRC message can be an extended RRC Reconfiguration Complete message, and the RRC Reconfiguration Complete message comprises the information of at least one second target cell meeting the handover triggering condition; optional contents of the second RRC message are as follows.

Correspondingly, after the network device receives the information of at least one second target cell sent by the terminal device, the method further includes:

in step S203, the network device sends second information to the terminal device, where the second information is used to indicate at least one second target cell that is accessible to the terminal device.

In some embodiments, the second information is indicated by a third MAC CE, which may be a new CHO redirect (redirect) MAC CE, and which has a corresponding LC ID. Optionally, the second information is further used to indicate a priority of the terminal device accessing the at least one second target cell. As shown in fig. 13, a represents the number of the target cell that is accessed most preferentially, B represents the number of the target cell that is accessed next most preferentially, and so on. The number of the target cell can be obtained from the information of at least one second target cell reported by the network equipment; optionally, the number indicating the target cell may be displayed in the information of the at least one second target cell, or the number of the target cell is determined according to the reporting order. The access priority of the target cell can be ordered according to the load information of the target cell, for example, the access priority of the target cell with small load is high; by setting the access priority of the target cell, the probability of successful conditional handover can be improved.

In other embodiments, the second information is indicated by a second DCI. Optionally, at least one bit of the second DCI is used to indicate a number of at least one second target cell accessible to the terminal device. The second DCI may be a target cell number indicating CHO redirection through a DCI bit newly introduced in the C-RNTI scrambled PDCCH. And the format of the second DCI can reuse the existing uplink DCI format or reuse the existing downlink DCI format, and the R bit in the format is used for indicating the second information. Of course, the second DCI may also use a new DCI format to indicate the second information.

In yet other embodiments, the second information is carried in a third RRC message. The third RRC message may be the same as the first RRC message, or may be different from the first RRC message. When the third RRC message is the same as the first RRC message, the third RRC message or the first RRC message indicates both first information and second information; i.e. the first RRC message or the third RRC message indicates that the terminal device is denied access to a first target cell corresponding to the target network device, and at the same time, second information is sent to the terminal device, where the second information is used to indicate at least one second target cell that is accessible to the terminal device. The second information comprises PCI and frequency point lists of at least one second target cell or number lists of at least one second target cell, and the number of the at least one second target cell is obtained from information of the at least one second target cell reported to the network equipment by the terminal equipment. The third RRC message may be a new RRC message, such as RRC CHO Redirection message; optionally, optional content of the RRC CHO Redirection message is as follows.

In summary, for the contention random access procedure, as shown in fig. 14, the source network device sends a CHO command to the terminal device, when the CHO condition is satisfied, the terminal device sends an Msg1 to the target network device, after Msg2 and Msg3, the target network device discovers the existing C-RNTI MAC CE and RRC reconfiguration complete message in Msg3, identifies the terminal device with the terminal device being conditional handover through the C-RNTI, sends an Msg4 to the terminal device according to the implementation algorithm of the terminal device, and denies the terminal device to access the target cell corresponding to the target network device through Msg 4. And stopping HO to the target cell by the terminal equipment, and initiating switching access to the target cell with the highest priority according to the indication in the Msg 4.

In the processing flow of cell switching, when the target network equipment sends the load congestion, the information of the first target cell corresponding to the refused access target network equipment can be sent to the terminal equipment, so that the terminal equipment stops the random access process of the first target cell; the number of times and time of the terminal equipment for trying random access under the congestion cell are reduced, and the switching time delay is reduced. Optionally, the terminal device can also select a second target cell to perform random access according to the information of at least one second target cell sent by the target network device, so as to realize redirection of conditional switching and improve the success rate of the conditional switching.

In order to implement the above-mentioned processing method for cell handover, an embodiment of the present invention provides a terminal device, where a composition structure of the terminal device 300, as shown in fig. 15, includes:

the first receiving unit 301 is configured to receive first information sent by a network device, where the first information is used to characterize a first target cell corresponding to the terminal device that is refused to access the network device.

In some embodiments, the first information is indicated by a MAC subheader of a MAC PDU; and when the value corresponding to the first bit is a first value, the first bit is used for indicating the first information, and the terminal equipment is refused to access the first target cell.

In other embodiments, the first information is indicated by a first MAC CE of a MAC PDU; and when the value corresponding to the second bit is a second value, the terminal equipment is refused to access the first target cell.

In further embodiments, the first information is indicated by a first DCI; and when the value corresponding to the third bit is a third value, the terminal equipment is indicated to be refused to access the first target cell.

In still other embodiments, the first information is carried in a first radio resource control, RRC, message.

In the above scheme, the MAC PDU is carried in PDSCH scheduled by PDCCH scrambled with C-RNTI.

In the above scheme, the first DCI is carried by a PDCCH scrambled by the C-RNTI.

In the above solution, the terminal device 300 further includes:

a first sending unit 302, configured to send information of at least one second target cell to the network device, where the information of the at least one second target cell is used for the network device to select the at least one second target cell for the terminal device to access.

In some embodiments, the information of the at least one second target cell is indicated by a second MAC CE.

In other embodiments, the information of the at least one second target cell is carried in a second RRC message.

In the above solution, the information of the second target cell at least includes: PCI and frequency point.

Optionally, the information of the second target cell includes, in addition to: and the number of the second target cell is also included except the PCI and the frequency point.

In the foregoing solution, the first receiving unit 301 is further configured to receive second information sent by the network device, where the second information is used to indicate at least one second target cell accessible by the terminal device.

In some embodiments, the second information is indicated by a third MAC CE; optionally, the second information is further used to indicate a priority of the terminal device 300 to access the at least one second target cell.

In other embodiments, the second information is indicated by a second DCI; optionally, at least one bit of the second DCI is used to indicate a number of at least one second target cell accessible to the terminal device.

In yet other embodiments, the second information is carried in a third RRC message.

In the above solution, the terminal device 300 further includes:

a processing unit 303 is configured to select one of the at least one second target cell for redirecting target cell access.

In order to implement the above-mentioned processing method for cell handover, an embodiment of the present invention provides a network device, where the composition structure of the network device 400, as shown in fig. 16, includes:

the second sending unit 401 is configured to send first information to a terminal device, where the first information is used to characterize a first target cell corresponding to the terminal device that is refused to access the network device.

In the above solution, the network device further includes: a second receiving unit 402, configured to receive information of at least one second target cell sent by the terminal device, where the information of the at least one second target cell is used for the network device to select at least one second target cell for access by the terminal device.

Wherein the information of the at least one second target cell is indicated by a second MAC CE; or, the information of the at least one second target cell is carried in a second RRC message.

In the foregoing solution, the second sending unit 401 is further configured to send second information to the terminal device, where the second information is used to indicate at least one second target cell accessible by the terminal device.

In some embodiments, the second information is indicated by a third MAC CE; optionally, the second information is further used to indicate a priority of the terminal device accessing the at least one second target cell.

In still other embodiments, the second information is carried in a third RRC message.

The embodiment of the invention also provides the terminal equipment, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the cell switching processing method executed by the terminal equipment when the computer program runs.

The embodiment of the invention also provides a network device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the cell switching processing method executed by the network device when the computer program runs.

Fig. 17 is a schematic diagram of a hardware composition structure of an electronic device (a terminal device and a target network device) according to an embodiment of the present invention, and an electronic device 700 includes: at least one processor 701, memory 702, and at least one network interface 704. The various components in the electronic device 700 are coupled together by a bus system 705. It is appreciated that the bus system 705 is used to enable connected communications between these components. The bus system 705 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration, the various buses are labeled as bus system 705 in fig. 17.

It is to be appreciated that the memory 702 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Wherein the nonvolatile Memory may be ROM, programmable read-Only Memory (PROM, programmable Read-Only Memory), erasable programmable read-Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable read-Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk read-Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 702 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory 702 in embodiments of the invention is used to store various types of data to support the operation of the electronic device 700. Examples of such data include: any computer program for operating on the electronic device 700, such as application 7022. A program for implementing the method of the embodiment of the present invention may be contained in the application program 7022.

The method disclosed in the above embodiment of the present invention may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 701 or by instructions in the form of software. The processor 701 may be a general purpose processor, a digital signal processor (DSP, digital Signal Processor), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor 701 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiment of the invention can be directly embodied in the hardware of the decoding processor or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium in a memory 702. The processor 701 reads information in the memory 702 and, in combination with its hardware, performs the steps of the method as described above.

In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC, application Specific Integrated Circuit), DSP, programmable logic device (PLD, programmable Logic Device), complex programmable logic device (CPLD, complex Programmable Logic Device), FPGA, general purpose processor, controller, MCU, MPU, or other electronic components for performing the aforementioned methods.

The embodiment of the application also provides a storage medium for storing the computer program.

Optionally, the storage medium may be applied to a terminal device in the embodiment of the present application, and the computer program makes a computer execute corresponding flows in each method in the embodiment of the present application, which is not described herein for brevity.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is not intended to limit the scope of the invention, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the invention.

Claims

1. A method of handling cell handover, the method comprising:

The terminal equipment receives first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment; wherein, the first information is indicated by a first downlink control signaling DCI; a third bit of the first DCI is used to indicate the first information; when the value corresponding to the third bit is a third value, the terminal equipment is indicated to be refused to access the first target cell; the first DCI is carried by a PDCCH scrambled by the C-RNTI;

the terminal equipment sends information of at least one second target cell to the network equipment, wherein the information of the at least one second target cell is used for the network equipment to select the at least one second target cell for the terminal equipment to access;

the terminal equipment receives second information sent by the network equipment, wherein the second information is used for indicating at least one second target cell which can be accessed by the terminal equipment;

the terminal device selects a redirection target cell access from the at least one second target cell.

2. The method of claim 1, wherein the first information is indicated by a MAC subheader of a media access control protocol data unit, MAC PDU.

3. The method of claim 2, wherein a first bit of the MAC subheader is used to indicate the first information.

4. A method according to claim 3, wherein the first bit corresponds to a first value, and the terminal device is denied access to the first target cell.

5. The method of claim 1, wherein the first information is indicated by a first MAC control element CE of a MAC PDU.

6. The method of claim 5, wherein a second bit of the first MAC CE is used to indicate the first information.

7. The method of claim 6, wherein the second bit corresponds to a second value indicating that the terminal device is denied access to the first target cell.

8. The method according to any of claims 2 to 7, wherein the MAC PDU is carried in a physical downlink shared channel, PDSCH, scheduled by a physical downlink control channel, PDCCH, scrambled by a cell radio network temporary identity, C-RNTI.

9. The method of claim 1, wherein the first information is carried in a first radio resource control, RRC, message.

10. The method of any of claims 1 to 7, wherein the information of the at least one second target cell is indicated by a second MAC CE.

11. The method according to any of claims 1 to 7, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.

12. The method according to any of claims 1 to 7, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.

13. The method of claim 12, wherein the information of the second target cell further comprises:

and the number of the second target cell.

14. The method of any of claims 1 to 7, wherein the second information is indicated by a third MAC CE.

15. The method of claim 14, wherein the second information is further used to indicate a priority of the terminal device to access the at least one second target cell.

16. The method of any of claims 1-7, wherein the second information is indicated by a second DCI.

17. The method of claim 16, wherein at least one bit of the second DCI indicates a number of at least one second target cell accessible to the terminal device.

18. The method of any of claims 1 to 7, wherein the second information is carried in a third RRC message.

19. A method of handling cell handover, the method comprising:

the network equipment sends first information to the terminal equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment; wherein, the first information is indicated by a first downlink control signaling DCI; a third bit of the first DCI is used to indicate the first information; when the value corresponding to the third bit is a third value, the terminal equipment is indicated to be refused to access the first target cell; the first DCI is carried by a PDCCH scrambled by the C-RNTI;

the network equipment receives information of at least one second target cell sent by the terminal equipment, wherein the information of the at least one second target cell is used for the network equipment to select the at least one second target cell for the terminal equipment to access;

the network device sends second information to the terminal device, where the second information is used to instruct at least one second target cell that the terminal device can access, so that the terminal device selects one redirection target cell to access in the at least one second target cell.

20. The method of claim 19, wherein the first information is indicated by a MAC subheader of a media access control protocol data unit MAC PDU.

21. The method of claim 20, wherein a first bit of the MAC subheader is used to indicate the first information.

22. The method of claim 21, wherein the first bit corresponds to a first value that characterizes the terminal device being denied access to the first target cell.

23. The method of claim 19, wherein the first information is indicated by a first MAC control element CE of a MAC PDU.

24. The method of claim 23, wherein a second bit of the first MAC CE is used to indicate the first information.

25. The method of claim 24, wherein the second bit corresponds to a second value indicating that the terminal device is denied access to the first target cell.

26. The method according to any of claims 20 to 25, wherein the MAC PDU is carried in a physical downlink shared channel, PDSCH, scheduled by a physical downlink control channel, PDCCH, scrambled by a cell radio network temporary identity, C-RNTI.

27. The method of claim 19, wherein the first information is carried in a first radio resource control, RRC, message.

28. The method of any of claims 19 to 25, wherein the information of the at least one second target cell is indicated by a second MAC CE.

29. The method according to any of claims 19 to 25, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.

30. The method of any of claims 19 to 25, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.

31. The method of claim 30, wherein the information of the second target cell further comprises:

and the number of the second target cell.

32. The method of any of claims 19 to 25, wherein the second information is indicated by a third MAC CE.

33. The method of claim 32, wherein the second information is further used to indicate a priority of the terminal device to access the at least one second target cell.

34. The method of any of claims 19-25, wherein the second information is indicated by a second DCI.

35. The method of claim 34, wherein at least one bit of the second DCI indicates a number of at least one second target cell accessible to the terminal device.

36. The method of any of claims 19 to 25, wherein the second information is carried in a third RRC message.

37. A terminal device, the terminal device comprising:

the first receiving unit is configured to receive first information sent by the network equipment, wherein the first information is used for representing that the terminal equipment is refused to access a first target cell corresponding to the network equipment; wherein, the first information is indicated by a first downlink control signaling DCI; a third bit of the first DCI is used to indicate the first information; when the value corresponding to the third bit is a third value, the terminal equipment is indicated to be refused to access the first target cell; the first DCI is carried by a PDCCH scrambled by the C-RNTI;

a first sending unit configured to send information of at least one second target cell to the network device, where the information of the at least one second target cell is used for the network device to select the at least one second target cell for the terminal device to access;

the first receiving unit is further configured to receive second information sent by the network device, where the second information is used to indicate at least one second target cell accessible by the terminal device;

and a processing unit configured to select one redirection target cell access from the at least one second target cell.

38. The terminal device of claim 37, wherein the first information is indicated by a MAC subheader of a media access control protocol data unit MAC PDU.

39. The terminal device of claim 38, wherein a first bit of the MAC subheader is used to indicate the first information.

40. The terminal device of claim 39, wherein the first bit corresponds to a first value that characterizes the terminal device being denied access to the first target cell.

41. The terminal device of claim 37, wherein the first information is indicated by a first MAC control element CE of a MAC PDU.

42. The terminal device of claim 41, wherein the second bit of the first MAC CE is used to indicate the first information.

43. A terminal device as defined in claim 42, wherein the second bit corresponds to a second value indicating that the terminal device is denied access to the first target cell.

44. The terminal device of any of claims 38 to 42, wherein the MAC PDU is carried in a physical downlink shared channel, PDSCH, scheduled by a physical downlink control channel, PDCCH, scrambled by a cell radio network temporary identity, C-RNTI.

45. The terminal device of any of claims 37 to 42, wherein the first information is carried in a first radio resource control, RRC, message.

46. The terminal device of any of claims 37 to 42, wherein the information of the at least one second target cell is indicated by a second MAC CE.

47. The terminal device of any of claims 37 to 42, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.

48. The terminal device of any of claims 37 to 42, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.

49. The terminal device of claim 48, wherein the information of the second target cell further comprises:

and the number of the second target cell.

50. The terminal device of any of claims 37 to 42, wherein the second information is indicated by a third MAC CE.

51. The terminal device of claim 50, wherein the second information is further for indicating a priority of the terminal device to access the at least one second target cell.

52. The terminal device of any of claims 37 to 42, wherein the second information is indicated by a second DCI.

53. The terminal device of claim 52, wherein at least one bit of the second DCI indicates a number of at least one second target cell accessible to the terminal device.

54. The terminal device of any of claims 37 to 42, wherein the second information is carried in a third RRC message.

55. A network device, the network device comprising:

the second sending unit is configured to send first information to the terminal equipment, wherein the first information is used for characterizing a first target cell corresponding to the network equipment which is refused to be accessed by the terminal equipment; wherein, the first information is indicated by a first downlink control signaling DCI; a third bit of the first DCI is used to indicate the first information; when the value corresponding to the third bit is a third value, the terminal equipment is indicated to be refused to access the first target cell; the first DCI is carried by a PDCCH scrambled by the C-RNTI;

the second receiving unit is configured to receive information of at least one second target cell sent by the terminal equipment, wherein the information of the at least one second target cell is used for the network equipment to select the at least one second target cell for the terminal equipment to access;

The second sending unit is further configured to send second information to the terminal device, where the second information is used to indicate at least one second target cell that is accessible to the terminal device, so that the terminal device selects one redirection target cell for access in the at least one second target cell.

56. The network device of claim 55, wherein the first information is indicated by a MAC subheader of a media access control protocol data unit, MAC PDU.

57. The network device of claim 56, wherein a first bit of the MAC subheader is used to indicate the first information.

58. The network device of claim 57, wherein the first bit corresponds to a first value that characterizes the terminal device being denied access to the first target cell.

59. The network device of claim 55, wherein the first information is indicated by a first MAC control element CE of a MAC PDU.

60. The network device of claim 59, wherein a second bit of the first MAC CE is used to indicate the first information.

61. The network device of claim 60, wherein the second bit corresponds to a second value indicating that the terminal device is denied access to the first target cell.

62. The network device of any of claims 56 to 61, wherein the MAC PDU is carried in a physical downlink shared channel, PDSCH, scheduled by a physical downlink control channel, PDCCH, scrambled by a cell radio network temporary identity, C-RNTI.

63. The network device of claim 55, wherein the first information is carried in a first radio resource control, RRC, message.

64. The network device of any of claims 55 to 61, wherein the information of the at least one second target cell is indicated by a second MAC CE.

65. The network device of any one of claims 55 to 61, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.

66. The network device of any of claims 55 to 61, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.

67. The network device of claim 66, wherein the information of the second target cell further comprises:

and the number of the second target cell.

68. The network device of any of claims 55 to 61, wherein the second information is indicated by a third MAC CE.

69. The network device of claim 68, wherein the second information is further used to indicate a priority of the terminal device access to the at least one second target cell.

70. The network device of any one of claims 55 to 61, wherein the second information is indicated by a second DCI.

71. The network device of claim 70, wherein at least one bit of the second DCI indicates a number of at least one second target cell accessible to the terminal device.

72. The network device of any of claims 55 to 61, wherein the second information is carried in a third RRC message.

73. A terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor being arranged to execute the steps of the method of handling cell handover according to any of claims 1 to 18 when the computer program is run.

74. A network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor being arranged to execute the steps of the method of handling a cell handover according to any of claims 19 to 36 when the computer program is run.

75. A computer readable storage medium storing an executable program which, when executed by a processor, implements the method of handling cell handover according to any one of claims 1 to 18.

76. A computer readable storage medium storing an executable program which, when executed by a processor, implements the method of handling cell handover according to any one of claims 19 to 36.