CN112789884A

CN112789884A - Cell switching processing method, equipment and storage medium

Info

Publication number: CN112789884A
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: 2021-05-11
Anticipated expiration: 2039-03-19
Also published as: CN112789884B; WO2020186464A1

Abstract

The invention discloses a cell switching processing method, which comprises the following steps: the method comprises the steps that terminal equipment receives first information sent by 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, equipment and storage medium

Technical Field

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

Background

In the related art, for conditional cell handover (conditional handover), after receiving a conditional handover command, a terminal device does not immediately perform cell handover; therefore, the target network device needs a longer time to maintain and manage the configuration resources in response to the source network device. When the target cell corresponding to the target network device is overloaded, the target network device may preferentially serve other terminal devices in the target cell for some reasons, and decide to cancel the resource 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 is available at present.

Disclosure of Invention

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

In a first aspect, an embodiment of the present invention provides a method for processing cell handover, including: the method comprises the steps that terminal equipment receives first information sent by 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, where the terminal device includes: the first receiving unit is configured to receive first information sent by a network device, where the first information is used to characterize that the terminal device is rejected from accessing a first target cell corresponding to the network device.

In a fourth aspect, an embodiment of the present invention provides a network device, where the network device includes: a second sending unit, configured to send first information to a terminal device, where the first information is used to characterize that the terminal device is rejected from accessing a first target cell corresponding to the network device.

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

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

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

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

The cell switching processing method provided by the embodiment of the invention comprises the following steps: the method comprises the steps that terminal equipment receives first information sent by 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. Thus, the network device is preferentially served to other terminal devices in the target cell for some reasons, and when the resource and configuration reserved for the terminal device corresponding to the conditional switching command are determined to be cancelled, the terminal device is informed through the first information that the terminal device cannot access the first target cell corresponding to the network device; the method and the device realize effective management of the network equipment on the conditional switch configuration resources, reduce the times and time of trying to switch access of the terminal equipment under the cell congestion, reduce the switching time delay and improve the success rate of cell switching.

Drawings

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

FIG. 2 is a diagram illustrating a contention-based random access procedure according to the present invention;

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

FIG. 4 is a diagram illustrating a random access procedure based on conditional handover according to the present invention;

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

fig. 6 is a schematic view 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 diagram illustrating that the MAC subheader of the existing MAC PDU indicates the first information according to the embodiment of the present invention;

fig. 8 is another alternative diagram illustrating that the MAC subheader of the existing MAC PDU indicates the first information according to the embodiment of the present invention;

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 illustrating a process flow of cell handover in a non-contention random access procedure according to an embodiment of the present invention;

fig. 11 is a first schematic processing flow chart of cell handover in a contention based random access procedure according to an embodiment of the present invention;

fig. 12 is a diagram illustrating 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 the embodiment of the present invention;

fig. 14 is a schematic diagram illustrating a cell handover processing flow in a contention based random access procedure according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

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

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

Detailed Description

So that the manner in which the features and technical contents of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the present invention will be rendered by reference to the appended drawings, which are included for purposes of illustration and not limitation.

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

Currently, with the pursuit of speed, delay, high-speed mobility, energy efficiency, and diversity and complexity of services in future life, the 3GPP international standards organization has begun to develop 5G. The main application scenarios of 5G are: enhanced Mobile Ultra wide band (eMBB), Low Latency high reliability Communications (URLLC), and Massive Machine Type Communications (mMTC).

The eMBB still targets users to obtain multimedia content, services and data, and its demand is growing very rapidly. On the other hand, because the eMBB may be deployed in different scenarios, such as indoor, urban, rural, etc., and the difference between the capabilities and the requirements is relatively large, it cannot be said in a general way, and it is necessary to analyze in detail in combination with a specific deployment scenario. Typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety, and the like. Typical characteristics of mtc include: high connection density, small data volume, insensitive time delay service, low cost and long service life of the module, etc.

Similar to the LTE system, a New radio (New ratio, NR) system supports a handover procedure of a connected terminal device. When a terminal device using network service moves from one cell to another cell, or due to reasons such as adjustment of wireless transmission service load, activation of operation maintenance, device failure, etc., in order to ensure communication continuity and service quality, the system needs to transfer a communication link between the terminal device and an original cell to a new cell, i.e., to perform a handover procedure.

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

phase 1 (including steps 1 to 5), handover preparation: including measurement control and reporting, handover requests and acknowledgements

Stage 2 (comprising steps 6 to 8), the handover is performed: the terminal equipment immediately executes the switching process after receiving the switching command, namely the terminal equipment disconnects the source cell and is connected with the target cell (for example, random access is executed, and an RRC switching completion message is sent to the target network equipment and the like); and (4) state transfer and data forwarding of a Secondary Node (SN).

Stage 3 (including steps 9 to 12), handover complete: the target cell and (AMF) and the User Plane Function (UPF) perform Path switching (Path Switch), releasing the terminal device context of the source network device.

A schematic diagram of a contention-based random access procedure, as shown in fig. 2; where Msg1 is a L1 message, Msg2 and Msg4 are L2 (Media Access Control (MAC) layer) messages, and Msg3 is a 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 (HARQ) transmissions. If one random access attempt fails, the terminal device may initiate the next random access attempt and perform power mapping until the maximum number of retransmissions allowed by the network side is reached. The success time of random access can be long or short depending on the number of random access attempts. The difference in the handover procedure is that after the maximum number of RACH retransmissions is reached, the terminal device does not terminate the subsequent random access attempt, and the (default) handover failure is not declared until the time T304 expires.

A schematic diagram of a non-contention based random access procedure, as shown in fig. 3; where Msg0 and Msg1 are L1 messages and Msg2 is a 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 a 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 perform power ramping until the maximum number of retransmissions allowed by the network device is reached or T304 times out (during handover).

A brief description of the conditional handle follows.

Aiming at the problems of frequent switching and easy failure of switching in a high-speed mobile scene and a high-frequency deployment scene, 3GPP is currently discussing the introduction of a conditional handover to LTE and NR systems. As shown in fig. 4, the terminal device performs cell measurement, configuration and reporting with the source network device; switching preparation is carried out on source network equipment and target network equipment; and when the terminal equipment meets the triggering condition, switching to the target network equipment. In the Conditional Handover, a Handover (HO) command (command) is configured in advance for the terminal device, so that the problem that the terminal device is late when to be handed over due to too long Handover preparation time is avoided. And for a high-speed rail scene, the operation track of the terminal device is specific, so the source network device can 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, the following problems may occur in the Conditional handle:

1. the load situation of the target network device has changed, e.g. has become overloaded (overload), compared to the previous situation sent in response to the handover request.

2. The target network device does not determine whether the terminal device will switch to the cell corresponding to the target network device (i.e. does not determine whether the terminal device will trigger the condition for switching to the cell), so the resource priority reserved for the terminal device is lower than the resource priority of the terminal device in other service connection modes.

3. If the source network device is configured to a plurality of target network devices of the terminal device, the terminal device may switch to a target network device with a lower load, but not the target network device.

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

Based on the above problem, the present invention provides a method for processing cell handover, and the method for processing cell handover according to the embodiment of the present application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

Illustratively, a communication system 100 applied in the embodiment of the present application 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, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or may be a Network device in a Mobile switching center, a relay Station, an Access point, a vehicle-mounted 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 Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a 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 another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. Terminal Equipment 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 (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

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

Fig. 5 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments 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 a network device 110 and a terminal device 120 having a communication function, and 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 other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

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

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

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

In specific implementation, the target network equipment identifies the C-RNTI of the terminal equipment through a special preamble sent by the terminal equipment; when the Msg2 is sent, a Physical Downlink Shared Channel (PDSCH) is scheduled through a Physical Downlink Control Channel (PDCCH) scrambled by the C-RNTI, and the PDSCH carries first information. The PDSCH can carry the first information at least through several implementations as follows:

the first realization mode is as follows: the first information is indicated by a MAC subheader (subheader) of a MAC Protocol Data Unit (PDU). Optionally, a 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 rejected to access the first target cell. The MAC subheader may be a new MAC subheader or an existing MAC subheader may be reused. As shown in fig. 7, taking the MAC subheader with Backoff indicator as an example, the first reserved R bit is used to indicate the first information, change the first R bit into a Rej bit, and set the value of the first Rej bit to 1, which indicates that a target network device rejects the terminal device to access a first target cell corresponding to the network device. Or, another optional diagram of indicating the first information by using the MAC subheader of the existing MAC PDU is shown in fig. 8, still taking the MAC subheader with Backoff indicator as an example, using the second reserved R bit therein to indicate the first information, changing the second R bit into a Rej bit, and setting the value of the second Rej bit to 1, which indicates that the target network device rejects the terminal device to access the first target cell corresponding to the network device.

In a second implementation, the MAC PDU is indicated by a first MAC Control Element (CE). The first MAC CE is a new RACH Rejection MAC CE, and a Logical Channel (LC) identity (identity, ID) is configured separately for the first MAC CE. 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 indicates to reject the terminal device from accessing the first target cell when a value corresponding to the second bit is a second value. For example, setting the value of the Rej bit to 1 indicates that the target network device rejects the terminal device to access the first target cell corresponding to the network device.

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

In a third implementation, the first Information is indicated by a first 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 referred to indicate the first information, or the existing uplink or downlink DCI format may be reused, and the R bit therein is used to indicate the first information.

For a non-contention random access procedure, when a network device rejects a terminal device to access a first target cell corresponding to the network device, the terminal device immediately terminates the random access procedure for the first target cell (e.g., cancels a 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 device returns to the source cell, if the source cell has a radio link failure, the terminal device triggers an RRC connection reestablishment procedure.

In summary, for the non-contention random access process and the schematic processing flow diagram of cell handover, 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 Msg1 to the target network device, the target network device sends Msg2 to the terminal device according to its implementation algorithm, and the terminal device is rejected to access the target cell corresponding to the target network device through Msg 2. And the terminal equipment stops HO to the target cell and tries to access to 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 a conditional handover sent by the source network device, where the handover command for the conditional handover includes a common RACH resource configured by the target cell (i.e., a RACH resource broadcasted by the target cell system message). When a switching condition aiming at a 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 that the terminal equipment is conditional access terminal equipment through C-RNTI in Msg3 in the random access process, and then whether the random access request of the terminal equipment is agreed is determined. When the target network equipment determines that the target network equipment has load congestion according to an algorithm of the target network equipment, first information is sent to the terminal equipment, and 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 message through Msg4 in a random access procedure.

In particular implementations, the target network device sends the first message via Msg 4. Optionally, the PDSCH is scheduled through a PDCCH scrambled by a C-RNTI, and the PDSCH carries the first information. The method for the PDSCH to carry the first information is the same as the three methods for sending the first information shown in fig. 7 to 9 in the non-contention random access process, and is not repeated here.

Different from the random access procedure for non-contention, in the random access procedure for contention, the method for the target network device to send the first message through the Msg4 further includes, in addition to the first implementation, the second implementation, and the third implementation:

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. Optional contents of the RRC CHO Reject message are as follows:

in summary, for the contention random access process, a first processing flow diagram of cell handover is shown in fig. 11, where a source network device sends a CHO command to a terminal device, when a CHO condition is satisfied, the terminal device sends Msg1 to a target network device, after Msg2 and Msg3, the target network device finds an existing C-RNTI MAC CE and RRC reconfiguration complete message in Msg3, identifies that the terminal device is a terminal device of a conditional access through a C-RNTI, sends Msg4 to the terminal device according to its implementation algorithm, and rejects the terminal device from accessing a target cell corresponding to the target network device through Msg 4. And the terminal equipment stops HO to the target cell and tries to access to other target cells corresponding to the CHO.

In some further embodiments, in the contention-based random access procedure, the process flow 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 the at least one second target cell for the terminal device to access.

In 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 comprises: physical Cell Identity (PCI) and frequency points; 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 the 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 includes the information of the at least one second target cell, and the information of each second target cell includes a PCI and a frequency point.

When the terminal device indicates information of at least one second target cell through a second RRC message, the second RRC message may be an extended RRC Reconfiguration Complete message, where the RRC Reconfiguration Complete message includes information of at least one second target cell that meets a handover trigger condition; optional contents of the second RRC message are as follows.

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

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 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 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. The structural diagram of the third MAC CE is shown in fig. 13, where a denotes the number of the target cell accessed most preferentially, B denotes the number of the target cell accessed second 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 of the indicated 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 a reporting order. The access priority of the target cell can be sequenced according to the load information of the target cell, and if the access priority of the target cell with small load is high; the probability of successful condition switching can be improved by setting the access priority of the 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. Wherein the second DCI may be a DCI bit newly introduced in a PDCCH scrambled by a C-RNTI to indicate a target cell number of CHO redirection. The format of the second DCI may reuse an existing uplink DCI format or reuse an existing downlink DCI format, and the R bit therein is used to indicate the second information. Of course, the second DCI may also employ a new DCI format to indicate the second information.

In still other embodiments, the second information is carried in a third RRC message. The third RRC message may be the same as or 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 first information and second information at the same time; that is, the first RRC message or the third RRC message indicates to reject the terminal device from accessing the first target cell corresponding to the target network device, and meanwhile, sends second information to the terminal device, where the second information is used to indicate at least one second target cell accessible to the terminal device. The second information includes a PCI and a frequency point list of at least one second target cell, or a number list of at least one second target cell, where the number of the at least one second target cell is obtained from information reported from the terminal device to the at least one second target cell of the network device. The third RRC message may be a new RRC message, such as an RRC CHO Redirection message; alternatively, the optional contents of the RRC CHO Redirection message are as follows.

In summary, for the contention random access process, the processing flow diagram of cell handover is shown in fig. 14, 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 Msg1 to the target network device, after Msg2 and Msg3, the target network device finds the existing C-RNTI MAC CE and RRC reconfiguration complete message in Msg3, identifies the terminal device as a conditional access terminal device through the C-RNTI, sends Msg4 to the terminal device according to its implementation, and rejects the terminal device from accessing the target cell corresponding to the target network device through Msg 4. And the terminal equipment stops HO to the target cell and initiates handover access to the target cell with the highest priority according to the indication in the Msg 4.

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

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

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

In some embodiments, the first information is indicated by a MAC subheader of the MAC PDU; and when a value corresponding to the first bit is a first value, characterizing that the terminal device is rejected from accessing 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, indicating to reject the terminal device from accessing the first target cell.

In still other embodiments, the first information is indicated by a first DCI; and when the value corresponding to the third bit is a third value, indicating that the terminal device is denied access to 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 a PDSCH scheduled by a PDCCH scrambled by a C-RNTI.

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

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

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

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

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

a processing unit 303, configured to select one redirection target cell access in the at least one second target cell.

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

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

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

In the foregoing 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 the at least one second target cell for the terminal device to access.

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 above scheme, 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 to 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.

The embodiment of the present invention further provides a terminal device, which includes a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is configured to execute the steps of the cell handover processing method executed by the terminal device when running the computer program.

The embodiment of the present invention further provides a network device, which includes a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is configured to execute the steps of the processing method for cell handover executed by the network device when running the computer program.

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

It will be appreciated that the memory 702 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. The non-volatile Memory may be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), magnetic random access Memory (FRAM), Flash Memory (Flash Memory), magnetic surface Memory, optical Disc, or Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The memory 702 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory 702 in the embodiments of the present invention is used for storing various types of data to support the operation of the terminal device 700. Examples of such data include: any computer program for operating on the terminal device 700, such as the application program 7022. Programs that implement methods in accordance with embodiments of the present invention can be included within application program 7022.

The method disclosed in the above embodiments 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 implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 701. The Processor 701 may be a general purpose Processor, a Digital Signal Processor (DSP), 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. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware 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 located in the memory 702, and the processor 701 may read the information in the memory 702 and perform the steps of the aforementioned methods in conjunction with its hardware.

In an exemplary embodiment, the terminal Device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), FPGAs, general purpose processors, controllers, MCUs, MPUs, 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 the terminal device in the embodiment of the present application, and the computer program enables the computer to execute corresponding processes in each method in the embodiment of the present application, which is not described herein again for brevity.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims

A method for handling cell handover, the method comprising:

the method comprises the steps that terminal equipment receives first information sent by 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 method of claim 1, wherein the first information is indicated by a MAC subheader of a medium access control protocol data unit, MAC PDU.
The method of claim 2, wherein a first bit of the MAC subheader is used to indicate the first information.
The method of claim 3, wherein the first bit is characterized as denying the terminal device to access the first target cell when the value corresponding to the first bit is a first value.
The method of claim 1, wherein the first information is indicated by a first MAC control element, CE, of a MAC PDU.
The method of claim 5, wherein a second bit of the first MAC CE is used to indicate the first information.
The method of claim 6, wherein the second bit indicates rejection of the terminal device from accessing the first target cell when the corresponding value is a second value.
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).
The method according to claim 1, wherein the first information is indicated by a first downlink control signaling, DCI.
The method of claim 9, wherein a third bit of the first DCI is used to indicate the first information.
The method of claim 10, wherein when the value corresponding to the third bit is a third value, indicating that the terminal device is denied access to the first target cell.
The method of any of claims 9 to 11, wherein the first DCI is carried by a C-RNTI scrambled PDCCH.
The method of claim 1, wherein the first information is carried in a first Radio Resource Control (RRC) message.
The method of any one of claims 1 to 13, wherein the method further comprises:

and 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 method of claim 14, wherein the information of the at least one second target cell is indicated by a second MAC CE.
The method of claim 14, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.
The method according to any of claims 14 to 16, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.
The method of claim 17, wherein the information of the second target cell further comprises:

the number of the second target cell.
The method of any of claims 14 to 18, wherein the method further comprises:

and 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 accessible to the terminal equipment.
The method of claim 19, wherein the second information is indicated by a third MAC CE.
The method of claim 20, wherein the second information is further used to indicate a priority of the terminal device to access the at least one second target cell.
The method of claim 19, wherein the second information is indicated by a second DCI.
The method of claim 22, wherein 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 method of claim 19, wherein the second information is carried in a third RRC message.
The method of any of claims 19 to 24, wherein the method further comprises:

and the terminal equipment selects a redirection target cell to access in the at least one second target cell.
A method for 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.
The method of claim 26, wherein the first information is indicated by a MAC subheader of a medium access control protocol data unit, MAC PDU.
The method of claim 27, wherein a first bit of the MAC subheader is used to indicate the first information.
The method of claim 28, wherein the first bit is characterized as denying the terminal device access to the first target cell when the value corresponding to the first bit is a first value.
The method of claim 26, wherein the first information is indicated by a first MAC control element, CE, of a MAC PDU.
The method of claim 30, wherein a second bit of the first MAC CE is used to indicate the first information.
The method of claim 31, wherein the second bit indicates a rejection of the terminal device from accessing the first target cell when the corresponding value is a second value.
The method according to any of claims 27 to 32, 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.
The method of claim 26, wherein the first information is indicated by first downlink control signaling, DCI.
The method of claim 34, wherein a third bit of the first DCI is used to indicate the first information.
The method of claim 35, wherein the value corresponding to the third bit is a third value indicating that the terminal device is denied access to the first target cell.
The method of any of claims 34 to 36, wherein the first DCI is carried by a C-RNTI scrambled PDCCH.
The method of claim 26, wherein the first information is carried in a first Radio Resource Control (RRC) message.
The method of any one of claims 26 to 38, wherein the method further comprises:

and 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 method of claim 39, wherein the information of the at least one second target cell is indicated by a second MAC CE.
The method of claim 39, wherein the information of the at least one second target cell is carried in a second Radio Resource Control (RRC) message.
The method of any of claims 39 to 41, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.
The method of claim 42, wherein the information of the second target cell further comprises:

the number of the second target cell.
The method of any one of claims 39 to 43, wherein the method further comprises:

and the network equipment sends second information to the terminal equipment, wherein the second information is used for indicating at least one second target cell accessible to the terminal equipment.
The method of claim 44, wherein the second information is indicated by a third MAC CE.
The method of claim 45, wherein the second information is further used for indicating a priority of the terminal device for accessing the at least one second target cell.
The method of claim 44, wherein the second information is indicated by a second DCI.
The method of claim 47, wherein 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 method of claim 44, wherein the second information is carried in a third RRC message.
A terminal device, the terminal device comprising:

the first receiving unit is configured to receive first information sent by a network device, where the first information is used to characterize that the terminal device is rejected from accessing a first target cell corresponding to the network device.
The terminal device of claim 50, wherein the first information is indicated by a MAC subheader of a media Access control protocol data Unit (MAC) PDU.
The terminal device of claim 51, wherein a first bit of the MAC sub-header is used to indicate the first information.
The terminal device of claim 52, wherein the indication that the terminal device is denied access to the first target cell is made when the value corresponding to the first bit is a first value.
The terminal device of claim 50, wherein the first information is indicated by a first MAC control element, CE, of a MAC PDU.
The terminal device of claim 54, wherein a second bit of the first MAC CE is used to indicate the first information.
The terminal device of claim 55, wherein the value corresponding to the second bit is a second value indicating that the terminal device is denied access to the first target cell.
The terminal device according to any of claims 51 to 56, 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).
The terminal device of claim 50, wherein the first information is indicated by first downlink control signaling (DCI).
The terminal device of claim 58, wherein a third bit of the first DCI is used to indicate the first information.
The terminal device of claim 59, wherein the value corresponding to the third bit is a third value indicating that the terminal device is denied access to the first target cell.
The terminal device of any one of claims 58 to 60, wherein the first DCI is carried by a C-RNTI-scrambled PDCCH.
The terminal device of claim 50, wherein the first information is carried in a first Radio Resource Control (RRC) message.
The terminal device of any one of claims 50 to 62, wherein the terminal device further comprises: 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 terminal device of claim 63, wherein the information of the at least one second target cell is indicated by a second MAC CE.
The terminal device of claim 63, wherein the information of the at least one second target cell is carried in a second radio resource control, RRC, message.
The terminal device of any of claims 63 to 65, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.
The terminal device of claim 66, wherein the information of the second target cell further comprises:

the number of the second target cell.
The terminal device according to any one of claims 63 to 67, wherein the first receiving unit is further configured to receive second information sent by the network device, the second information indicating at least one second target cell accessible to the terminal device.
The terminal device of claim 68, wherein the second information is indicated by a third MAC CE.
The terminal device of claim 69, wherein the second information is further used to indicate a priority of the terminal device to access the at least one second target cell.
The terminal device of claim 68, wherein the second information is indicated by a second DCI.
The terminal device of claim 71, wherein 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 terminal device of claim 68, wherein the second information is carried in a third RRC message.
The terminal device of any one of claims 68-73, wherein the terminal device further comprises:

and the processing unit is configured to select a redirection target cell to access in the at least one second target cell.
A network device, the network device comprising:

a second sending unit, configured to send first information to a terminal device, where the first information is used to characterize that the terminal device is rejected from accessing a first target cell corresponding to the network device.
The network device of claim 75, wherein the first information is indicated by a MAC subheader of a media Access control protocol data Unit (MAC) PDU.
The network device of claim 76, wherein a first bit of the MAC subheader is used to indicate the first information.
The network device of claim 77, wherein the rejection of the terminal device to access the first target cell is characterized when the value corresponding to the first bit is a first value.
The network device of claim 75, wherein the first information is indicated by a first MAC control element, CE, of a MAC PDU.
The network device of claim 79, wherein a second bit of the first MAC CE is used to indicate the first information.
The network device of claim 80, wherein the second bit indicates rejection of the terminal device to access the first target cell when the corresponding value is a second value.
The network device of any one of claims 76 to 81, 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).
The network device of claim 75, wherein the first information is indicated by first Downlink control Signaling (DCI).
The network device of claim 83, wherein a third bit of the first DCI is used to indicate the first information.
The network device of claim 84, wherein the value corresponding to the third bit is a third value indicating that the terminal device is denied access to the first target cell.
The network device of any one of claims 83 to 85, wherein the first DCI is carried by a C-RNTI-scrambled PDCCH.
The network device of claim 75, wherein the first information is carried in a first Radio Resource Control (RRC) message.
The network device of any one of claims 75-87, wherein the network device further comprises:

a second receiving unit, 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 the at least one second target cell for the terminal device to access.
The network device of claim 88, wherein the information of the at least one second target cell is indicated by a second MAC CE.
The network device of claim 88, wherein the information of the at least one second target cell is carried in a second Radio Resource Control (RRC) message.
The network device of any one of claims 88 to 90, wherein the information of the second target cell comprises at least:

the physical cell identifies the PCI and the frequency point.
The network device of claim 91, wherein the information of the second target cell further comprises:

the number of the second target cell.
The network device of any one of claims 88 to 92, wherein the second sending unit is further configured to send second information to the terminal device, the second information indicating at least one second target cell accessible to the terminal device.
The network device of claim 93, wherein the second information is indicated by a third MAC CE.
The network device of claim 94, wherein the second information is further used to indicate a priority of the terminal device to access the at least one second target cell.
The network device of claim 93, wherein the second information is indicated by a second DCI.
The network device of claim 96, wherein 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 network device of claim 93, wherein the second information is carried in a third RRC message.
A terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor is configured to execute the steps of the method for handling cell handover according to any one of claims 1 to 25 when running the computer program.
A network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor is configured to execute the steps of the method for handling cell handover according to any of claims 26 to 49 when running the computer program.
A storage medium storing an executable program which, when executed by a processor, implements the method of handling cell handover of any one of claims 1 to 25.
A storage medium storing an executable program which, when executed by a processor, implements the method of handling cell handover of any one of claims 26 to 49.