CN112789884B - Cell handover processing method, equipment and storage medium - Google Patents

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 handover processing method, equipment and storage medium

Technical field

The present invention relates to the field of wireless communication technology, and in particular, to a cell handover processing method, equipment and storage medium.

Background technique

In related technologies, for conditional handover, the terminal device does not immediately perform cell handover after receiving the conditional handover command; therefore, the target network device requires a long time to maintain and manage the response to the source network device. configuration resources. When the target cell corresponding to the target network device is overloaded in transmission, the target network device may give priority to 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, there is currently no effective solution for how to handle the cell handover initiated by the terminal device in order to reduce the handover delay and improve the success rate of the cell handover.

Contents of the invention

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

In a first aspect, an embodiment of the present invention provides a cell handover processing method, including: a terminal device receiving first information sent by a network device, where the first information is used to indicate that the terminal device is denied access to the network device corresponding to the first target community.

In a second aspect, an embodiment of the present invention provides a cell handover processing method, including: a network device sends first information to a terminal device, where the first information is used to indicate that the terminal device is denied access to the network device corresponding to The first target area.

In a third aspect, embodiments of the present invention provide a terminal device. The terminal device includes: a first receiving unit configured to receive first information sent by a network device, where the first information is used to indicate that the terminal device is refused access. Enter the first target cell corresponding to the network device.

In a fourth aspect, embodiments of the present invention provide a network device. The network device includes: a second sending unit configured to send first information to a terminal device, where the first information is used to indicate that the terminal device is denied access. The first target cell corresponding to the network device.

In a fifth aspect, embodiments of the present invention provide a terminal device, including a processor and a memory used to store a computer program that can be run on the processor, wherein when the processor is used to run the computer program, the terminal device executes the Steps of the cell handover processing method performed by the device.

In a sixth aspect, an embodiment of the present invention provides a network device, including a processor and a memory used to store a computer program that can be run on the processor, wherein when the processor is used to run the computer program, the above network device is executed. Steps of the cell handover processing method performed by the device.

In a seventh aspect, embodiments of the present invention provide a storage medium that stores an executable program. When the executable program is executed by a processor, the processing method for cell switching executed by the terminal device is implemented.

In an eighth aspect, embodiments of the present invention provide a storage medium that stores an executable program. When the executable program is executed by a processor, the processing method for cell switching executed by the network device is implemented.

The cell handover processing method provided by an embodiment of the present invention includes: a terminal device receiving first information sent by a network device, where the first information is used to indicate that the terminal device is denied access to the first target cell corresponding to the network device. . In this way, when the network device gives priority to serving other terminal devices in the target cell due to some reasons, and decides to cancel the resources and configuration reserved for the terminal device corresponding to the conditional handover command, it notifies the terminal device through the first information that it cannot access all the terminal devices. The first target cell corresponding to the above network equipment; achieves effective management of conditional handover configuration resources by network equipment, reduces the number and time of terminal equipment trying to switch access under cell congestion, reduces handover delay, and improves cell handover success rate.

Description of the drawings

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

Figure 2 is a schematic diagram of the competition-based random access process of the present invention;

Figure 3 is a schematic diagram of the non-contention-based random access process of the present invention;

Figure 4 is a schematic diagram of the random access process based on conditional handover according to the present invention;

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

Figure 6 is a schematic diagram of an optional processing flow of a cell handover processing method according to an embodiment of the present invention;

Figure 7 is an optional schematic diagram of indicating the first information through the MAC subheader of the existing MAC PDU according to an embodiment of the present invention;

Figure 8 is another optional schematic diagram of indicating the first information through the MAC subheader of the existing MAC PDU according to an embodiment of the present invention;

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

Figure 10 is a schematic diagram of the processing flow of cell handover for the non-contention random access process according to the embodiment of the present invention;

Figure 11 is a schematic diagram 1 of the processing flow of cell handover in the random access process for competition according to the embodiment of the present invention;

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

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

Figure 14 is a schematic diagram 2 of the processing flow of cell handover in the random access process for competition according to the embodiment of the present invention;

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

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

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

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

Before giving a detailed description of the cell handover processing method provided by the embodiment of the present invention, a brief description is given of the cell handover process in related technologies and the cell handover processing method after the cell handover.

Currently, with people's pursuit of speed, delay, high-speed mobility, energy efficiency, and the 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 Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLC), and Massive Machine Type Communication (mMTC).

eMBB still aims at users to obtain multimedia content, services and data, and its demand is growing rapidly. On the other hand, since eMBB may be deployed in different scenarios, such as indoors, urban areas, rural areas, etc., its capabilities and requirements are also quite different, so it cannot be generalized and must be analyzed in detail based on specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, telemedicine operations (surgery), traffic safety and security, etc. Typical features of mMTC include: high connection density, small data volume, delay-insensitive services, low cost and long service life of the module.

Similar to the LTE system, the New Ration (NR) system supports the handover process of connected terminal equipment. When a terminal device that is using network services moves from one cell to another, or due to wireless transmission business load adjustment, activation operation and maintenance, equipment failure, etc., in order to ensure the continuity of communication and the quality of service, the system must The communication link between the terminal equipment and the original cell is transferred to the new cell, that is, the handover process is performed.

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

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

Phase 2 (including steps 6 to 8), handover execution: The terminal device immediately executes the handover process after receiving the handover command, that is, the terminal device disconnects the source cell and connects to the target cell (such as performing random access, and sends an RRC handover completion message to Target network equipment, etc.); Secondary Node (SN) status transfer and data forwarding.

Phase 3 (including steps 9 to 12), handover is completed: the target cell performs path switch (PathSwitch) with (Acess and MobilityManagement Function, AMF) and user plane function (User Port Function, UPF), releasing the terminal device context of the source network device .

A schematic diagram of the contention-based random access process is shown in Figure 2; where Msg1 is an L1 message, Msg2 and Msg4 are L2 (Media Access Control (MAC) layer) messages, and Msg3 is an L3 (RRC layer) message. ) or L2 (MAC layer) message. Msg1 and Msg2 do not use HARQ transmission, while Msg3 and Msg4 use Hybrid Automatic Repeat reQuest (HARQ) transmission. If a random access attempt fails, the terminal device can initiate the next random access attempt and perform power ramping until the maximum number of retransmissions allowed by the network side is reached. Therefore, the time for successful random access can be longer or shorter, depending on the number of random access attempts. The difference during the handover process is that after reaching the maximum number of RACH retransmissions, the terminal device does not terminate subsequent random access attempts and does not declare the handover failure until T304 times out.

A schematic diagram of the non-contention-based random access process is shown in Figure 3; where Msg0 and Msg1 are L1 messages, and Msg2 is an L2 (MAC layer) message. In the non-contention random access process, non-contention random access resources are obtained through RRC signaling or PDCCH sequence (order). Similar to the contention-based random access process, after a non-contention random access failure, the terminal device can initiate the next random access attempt and perform power ramping until the maximum number of retransmissions allowed by the network device or T304 is reached. Timeout (during switching).

The following is a brief description of conditional handover.

In view of the problems of frequent handover and easy handover failure in high-speed mobile scenarios and high-frequency deployment scenarios, 3GPP is currently discussing the introduction of conditional handover for LTE and NR systems. As shown in Figure 4, the terminal device and the source network device perform cell measurement, configuration and reporting; the source network device and the target network device prepare for handover; when the terminal device meets the trigger conditions, it switches to the target network device. In conditional handover, by configuring the handover (HO) command (command) for the terminal device in advance, the problem of the terminal device being too late when the handover preparation time is too long caused by the handover is avoided. Moreover, for high-speed rail scenarios, the running trajectory 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 contains conditions for triggering the terminal device to switch. When the configured conditions are met, When the conditions are met, the terminal device initiates an access request to the target network device. However, there may be the following problems in Conditional handover:

1. The load condition of the target network device has changed compared with the previous response to the handover request, for example, it has become overloaded.

2. The target network device is not sure whether the terminal device will switch to the cell corresponding to the target network device (that is, it is not sure whether the terminal device will trigger the conditions for switching to this cell). Therefore, the priority of resources reserved for the terminal device is compared with that of the current service. The resource priority of terminal devices in other connection modes is low.

3. If the source network device is configured with multiple target network devices for 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.

However, existing protocols do not support handover rejection by the target network device, which will cause the terminal device to continuously initiate random access attempts to the target network device, and ultimately lead to cell handover failure and increase the interruption time of cell handover.

Based on the above problems, the present invention provides a cell handover processing method. The cell handover processing method in the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, code division Multiple Access (Code Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access, WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in Figure 5. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (also referred to as a communication terminal or terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in the GSM system or CDMA system, a base station (NodeB, NB) in the WCDMA system, or an evolved base station (NB) in the LTE system. Evolutional Node B (eNB or eNodeB), or a wireless controller in the Cloud Radio Access Network (CloudRadio Access Network, CRAN), or the network device can be a mobile switching center, relay station, access point, vehicle equipment, wearable Equipment, hubs, switches, bridges, routers, network side equipment in the 5G network or network equipment in the future evolved Public Land Mobile Network (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. As used herein, "terminal equipment" includes but is not limited to connections via wired lines, such as connections via the Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cables, and direct cables; and/or another data connection/network; and/or via a wireless interface, e.g. for cellular networks, Wireless Local Area Network (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM A broadcast transmitter; and/or a device of another terminal device configured to receive/transmit communication signals; and/or an Internet of Things (IoT) device. A terminal device configured to communicate via 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 System (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communications capabilities; may include radiotelephones, pagers, Internet/Intranet PDAs with Internet access, Web browsers, planners, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or handheld receivers or other electronic devices including radiotelephone transceivers device. Terminal equipment may refer to access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or User device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or a device with wireless communication capabilities Handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolved PLMNs, etc.

Optionally, device to device (D2D) communication can be performed between terminal devices 120 .

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

Figure 5 exemplarily shows one network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. This application The embodiment does not limit this.

Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the present application.

It should be understood that in the embodiments of this application, devices with communication functions in the network/system may be called communication devices. Taking the communication system 100 shown in Figure 5 as an example, the communication device may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be described again here. ; The communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities, which are not limited in the embodiments of this application.

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

Step S201: The terminal device receives first information sent by the network device, where the first information is used to indicate that the terminal device is denied access to the first target cell corresponding to the network device.

In some embodiments, for a non-contention random access process, before performing step S201, the terminal device receives a handover command for conditional handover sent by the source network device, and the handover command for conditional handover includes a dedicated configuration of the target cell. RACH resources (i.e. preamble). When the handover condition for the target cell is triggered, the terminal device initiates a non-contention-based random access process to the target network device. The target network device identifies the terminal device as a conditional handover terminal device through a dedicated preamble, and then determines whether to agree to the terminal device's conditional handover. Random access request. When the target network device determines that load congestion occurs on the target network device according to its own algorithm or policy, it sends first information to the terminal device, where the first information is used to indicate that the terminal device is denied access to the third node corresponding to the target network device. A target community. Optionally, the target network device sends the first information through Msg2 in the random access process.

During the specific implementation, the target network device identifies the C-RNTI of the terminal device through the dedicated preamble sent by the terminal device; when sending Msg2, the physical downlink is scheduled through the Physical Downlink Control Channel (PDCCH) scrambled by the C-RNTI. Shared channel (Physical Downlink Shared Channel, PDSCH), the PDSCH carries the first information. The PDSCH can carry the first information through at least the following implementation methods:

The first implementation method is: indicating the first information through the MAC subheader (subheader) of the MAC Protocol Data Unit (PDU). Optionally, the first bit of the MAC subheader is used to indicate the first information; when the value corresponding to the first bit is the first value, it indicates that the terminal device is denied access to the first target. community. The MAC subheader may be a new MAC subheader, or an existing MAC subheader may be reused. An optional schematic diagram of indicating the first information through the MAC subheader of the existing MAC PDU is shown in Figure 7. Taking the MAC subheader with Backoff indicator as an example, the first reserved R bit is used to indicate the first information. information, change the first R bit to Rej bit, and set the value of the first Rej bit to 1, indicating that the target network device refuses the terminal device to access the first target cell corresponding to the network device. Or, another optional schematic diagram of indicating the first information through the MAC subheader of the existing MAC PDU, as shown in Figure 8, still taking the MAC subheader with Backoff indicator as an example, using the second reserved R bit to indicate The first information changes the second R bit to Rej bit, and sets the value of the second Rej bit to 1, indicating that the target network device refuses the terminal device to access the first target corresponding to the network device. community.

The second implementation method is indicated by the first MAC Control Element (Control Element, CE) of the MAC PDU. The first MAC CE is a new RACH Rejection MAC CE, and a logical channel (Logic Channel, LC) identification (Identify, ID) specifically for the first MAC CE is configured. The schematic diagram of the first MAC CE is as shown in Figure 9. The second bit (Rej bit) of the first MAC CE is used to indicate the first information. When the value corresponding to the second bit is the second value , indicating that the terminal equipment is 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 manner and the second implementation manner, the MAC PDU is carried in the PDSCH scheduled by the PDCCH scrambled by the C-RNTI.

The third implementation manner indicates the first information through first downlink control signaling (Downlink Control Information, DCI). Optionally, the 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, it indicates that the terminal device is denied access to the first target neighborhood. During specific implementation, a new DCI bit can be introduced into the C-RNTI scrambled PDCCH to indicate the first information; a new DCI format can be quoted to indicate the first information, or the existing uplink or downlink DCI format can be reused. The R bit is used to indicate the first information.

For the non-contention random access process, 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 process for the first target cell (such as canceling subsequent random access try). Optionally, when there are other target cells that meet the handover conditions, the terminal device selects one of the target cells for access; otherwise, the terminal device returns to the source cell; when the terminal device returns to the source cell, if a wireless link occurs in the source cell Failure, the terminal device triggers the RRC connection reestablishment process.

In summary, for the non-contention random access process, the cell handover processing flow diagram is shown in Figure 10. The source network device sends a CHO command to the terminal device. When the CHO condition is met, the terminal device sends Msg1 to the target network device. The target network device sends Msg2 to the terminal device according to its own implementation algorithm, and uses Msg2 to deny the terminal device access to the target cell corresponding to the target network device. The terminal equipment stops HO to the target cell and tries to access the target cells corresponding to other CHOs.

In other embodiments, for the contention random access process, before performing step S201, the terminal device receives a handover command for conditional handover sent by the source network device, and the handover command for conditional handover includes the common configuration of the target cell. RACH resources (that is, RACH resources broadcast by the target cell system message). When the handover condition for the target cell is triggered, the terminal device initiates a competition-based random access process to the target network device. The target network device identifies the terminal device as a conditional handover terminal device through the C-RNTI in Msg3 during the random access process. Then it is determined whether to agree to the random access request of the terminal device. When the target network device determines that load congestion occurs on the target network device according to its own algorithm, it sends first information to the terminal device, where the first information is used to indicate that the terminal device is denied access to the first target corresponding to the target network device. community. Optionally, the target network device sends the first information through Msg4 in the random access process.

In specific implementation, the target network device sends the first information through Msg4. Optionally, the PDSCH is scheduled through the C-RNTI scrambled PDCCH, and the PDSCH carries the first information. The manner in which the PDSCH carries the first information is the same as the three manners of transmitting the first information shown in Figures 7 to 9 in the above non-contention random access process, and will not be described again here.

Different from the random access process for non-contention, in the random access process for competition, the target network device sends the first information through Msg4. In addition to the first implementation method, the second implementation method and the third implementation method mentioned above, In addition to implementation methods, they also include:

In a fourth implementation manner, the first information is carried through the first RRC message. Optionally, the first RRC message may be a new RRC message, such as an RRC CHO Reject message. The optional content of the RRC CHO Reject message is as follows:

In summary, for the competitive random access process, the cell handover processing flow diagram 1 is shown in Figure 11. The source network device sends a CHO command to the terminal device. When the CHO condition is met, 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 completion messages in Msg3, and identifies the terminal device as a conditional handover terminal device through C-RNTI, and sends the message to the terminal device according to its own implementation algorithm. The terminal device sends Msg4, and uses Msg4 to deny the terminal device access to the target cell corresponding to the target network device. The terminal equipment stops HO to the target cell and tries to access the target cells corresponding to other CHOs.

In some embodiments, during the random access process for contention, the cell switching process also includes:

Step S202: The terminal device sends information of at least one second target cell to the network device. The information of the at least one second target cell is used by the network device to select at least one second target cell for the terminal device. access.

In specific implementation, the information of the at least one second target cell is indicated through the second MAC CE, or the information of the at least one second target cell is carried in the second RRC message. Wherein, the information of the second target cell at least includes: Physical Cell Identifier (PCI) and frequency point; or, the information of the second target cell at least includes PCI, frequency point and 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 Figure 12, which includes the information of at least one second target cell, The information of each second target cell includes PCI and frequency point.

When the terminal device indicates the information of at least one second target cell through the second RRC message, the second RRC message may be an extended RRC Reconfiguration Complete message, and the RRC Reconfiguration Complete message includes at least one second target that satisfies the handover triggering condition. Cell information; the optional content of the second RRC message is 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:

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 the terminal device can access.

In some embodiments, the second information is indicated by a third MAC CE, the third MAC CE may be a new CHO redirection MAC CE, and the third MAC CE has a corresponding LC ID . Optionally, the second information is also used to indicate the priority of the terminal device in accessing the at least one second target cell. The schematic structural diagram of the third MAC CE is shown in Figure 13. A represents the number of the target cell with the highest priority access, B represents the number of the target cell with the second priority access, 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 device; optionally, the information of the at least one second target cell can be displayed to indicate the number of the target cell, or according to the reported The order determines the number of the target cell. The access priority of the target cell can be sorted according to the load information of the target cell. For example, the access priority of the target cell with a 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 the number of at least one second target cell that the terminal device can access. Wherein, the second DCI may be a newly introduced DCI bit in the PDCCH scrambled by C-RNTI to indicate the target cell number of the CHO redirection. The format of the second DCI can reuse the existing uplink DCI format or reuse the existing downlink DCI format, and use the R bit therein to indicate the second information. Of course, the second DCI can also use a new DCI format to indicate the second information.

In some embodiments, the second information is carried in a third RRC message. The third RRC message and the first RRC message may be the same or different. When the third RRC message and the first RRC message are the same, the third RRC message or the first RRC message simultaneously indicates the first information and the second information; that is, the first RRC message or the third The RRC message indicates that the terminal device is denied access to the first target cell corresponding to the target network device, and at the same time, second information is sent to the terminal device, and the second information is used to indicate at least one second cell that the terminal device can access. target neighborhood. The second information includes a PCI and frequency point list of at least one second target cell, or a number list of at least one second target cell. The number of the at least one second target cell is reported from the terminal device to at least one of the network devices. Obtained from the information of the second target cell. The third RRC message may be a new RRC message, such as an RRC CHO Redirection message; optionally, the optional content of the RRC CHO Redirection message is as follows.

In summary, for the competitive random access process, the cell handover processing flow diagram 2 is shown in Figure 14. The source network device sends a CHO command to the terminal device. When the CHO condition is met, 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 completion messages in Msg3, and identifies the terminal device as a conditional handover terminal device through C-RNTI, and sends the message to the terminal device according to its own implementation algorithm. The terminal device sends Msg4, and uses Msg4 to deny the terminal device access to the target cell corresponding to the target network device. The terminal equipment stops HO to the target cell, and initiates handover access to the target cell with the highest priority according to the instructions in Msg4.

In the above-mentioned cell handover processing flow of the present invention, when the target network device is congested, it can send information to the terminal device that refuses to access the first target cell corresponding to the target network device, so that the terminal device stops random access to the first target cell. Entry process; reduces the number and time of random access attempts by terminal equipment in congested cells, and reduces handover delay. Optionally, the terminal device can also select a second target cell for random access based on the information of at least one second target cell sent by the target network device, thereby realizing redirection of conditional handover and improving the success rate of conditional handover.

In order to implement the above cell handover processing method, an embodiment of the present invention provides a terminal device. The composition structure of the terminal device 300, as shown in Figure 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 indicate that the terminal device is denied access to the first target cell corresponding to the network device.

In some embodiments, the first information is indicated through the MAC subheader of the MAC PDU; wherein the first bit of the MAC subheader is used to indicate the first information, and the value corresponding to the first bit When it is the first value, it indicates that the terminal device is denied access to the first target cell.

In other embodiments, the first information is indicated by the first MAC CE of the MAC PDU; wherein the second bit of the first MAC CE is used to indicate the first information, and the second bit When the corresponding value is the second value, it indicates that the terminal device is denied access to the first target cell.

In some embodiments, the first information is indicated by a first DCI; wherein the third bit of the first DCI is used to indicate the first information, and the value corresponding to the third bit is the third bit. When the value is three, it indicates that the terminal device is denied access to the first target cell.

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

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

In the above solution, the first DCI is carried on the PDCCH scrambled by C-RNTI.

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

The first sending unit 302 is 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 by the network device to select at least one second target cell for the terminal. Device access.

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

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

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

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

In the above 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 to the terminal device.

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

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

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

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

The processing unit 303 is configured to select a redirection target cell for access from the at least one second target cell.

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

The second sending unit 401 is configured to send first information to the terminal device, where the first information is used to indicate that the terminal device is denied access to the first target cell corresponding to the network device.

In some embodiments, the first information is indicated through the MAC subheader of the MAC PDU; wherein the first bit of the MAC subheader is used to indicate the first information, and the value corresponding to the first bit When it is the first value, it indicates that the terminal device is denied access to the first target cell.

In other embodiments, the first information is indicated by the first MAC CE of the MAC PDU; wherein the second bit of the first MAC CE is used to indicate the first information, and the second bit When the corresponding value is the second value, it indicates that the terminal device is denied access to the first target cell.

In some embodiments, the first information is indicated by a first DCI; wherein the third bit of the first DCI is used to indicate the first information, and the value corresponding to the third bit is the third bit. When the value is three, it indicates that the terminal device is denied access to the first target cell.

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

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

In the above solution, the first DCI is carried on the PDCCH scrambled by C-RNTI.

In the above solution, the network device further includes: a second receiving unit 402 configured to receive information on at least one second target cell sent by the terminal device, where the information on the at least one second target cell is used in the network. The device selects 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 the second MAC CE; or, the information of the at least one second target cell is carried in the second RRC message.

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

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

In the above 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 that the terminal device can access.

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

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

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

An embodiment of the present invention also provides a terminal device, including a processor and a memory used to store a computer program that can be run on the processor, wherein when the processor is used to run the computer program, the above-mentioned terminal device executes Steps of the cell handover processing method.

An embodiment of the present invention also provides a network device, including a processor and a memory used to store a computer program that can be run on the processor, wherein when the processor is used to run the computer program, the network device executes Steps of the cell handover processing method.

Figure 17 is a schematic diagram of the hardware composition of an electronic device (terminal device and target network device) according to an embodiment of the present invention. The electronic device 700 includes: at least one processor 701, a memory 702, and at least one network interface 704. The various components in electronic device 700 are coupled together by bus system 705 . It can be understood that the bus system 705 is used to implement connection communication between these components. In addition to the data bus, the bus system 705 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, the various buses are labeled bus system 705 in FIG. 17 .

It can be understood that the memory 702 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can 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 Memory Read-only memory (EEPROM, ElectricallyErasable Programmable Read-Only Memory), magnetic random access memory (FRAM, ferromagneticrandom access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM, Compact Disc Read-Only Memory); magnetic surface memory can be disk memory or tape memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of illustration, but 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, Dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, Synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (DDRSDRAM, Double Data RateSynchronous 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 include, but is not limited to, these and any other suitable types of memory.

The memory 702 in the embodiment of the present 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 electronic device 700, such as application 7022. The program that implements the method of the embodiment of the present invention may be included in the application program 7022.

The methods disclosed in the above embodiments of the present invention can be applied to the processor 701 or implemented by the processor 701 . The processor 701 may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor 701 . The above-mentioned processor 701 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 701 can implement or execute the disclosed methods, steps and logical block diagrams in the embodiments of the present invention. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 702. The processor 701 reads the information in the memory 702, and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the electronic device 700 may be configured by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), Complex Programmable Logic Device), FPGA, general processor, controller, MCU, MPU, or other electronic components for executing the aforementioned method.

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

Optionally, the storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding processes in the various methods of the embodiment of the present application. For the sake of brevity, the details will not be described again.

The 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 process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes 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 device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

The above are only preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in within the protection scope of the present invention.

Claims (76)

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.