WO2021056468A1 - 小区重选的方法及装置 - Google Patents

小区重选的方法及装置 Download PDF

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Publication number
WO2021056468A1
WO2021056468A1 PCT/CN2019/108726 CN2019108726W WO2021056468A1 WO 2021056468 A1 WO2021056468 A1 WO 2021056468A1 CN 2019108726 W CN2019108726 W CN 2019108726W WO 2021056468 A1 WO2021056468 A1 WO 2021056468A1
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WIPO (PCT)
Prior art keywords
cell
reselection
threshold
quality
time
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PCT/CN2019/108726
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English (en)
French (fr)
Inventor
耿婷婷
吴烨丹
严乐
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/108726 priority Critical patent/WO2021056468A1/zh
Priority to EP19947403.2A priority patent/EP4024947A4/en
Priority to CN201980100431.6A priority patent/CN114402658A/zh
Publication of WO2021056468A1 publication Critical patent/WO2021056468A1/zh
Priority to US17/656,503 priority patent/US20220217602A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/085—Reselecting an access point involving beams of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/328—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by altitude

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a method and device for cell reselection.
  • NTN non-terrestrial networks
  • the near-distance effect of the mass distribution of the cell under the network equipment of the high-altitude mobile platform is not obvious (that is, the distance between the network equipment of the high-altitude mobile platform and the terminal equipment is relatively long, resulting in the movement of the terminal equipment. This will not cause the cell quality of the terminal device to be significantly affected), so that the current method of reselecting based on the cell quality is not efficient.
  • the present application provides a method and device for cell reselection, which are used to improve the efficiency of cell reselection in a high-altitude mobile platform communication scenario.
  • this application provides a method for cell reselection, including: measuring a target frequency point to obtain at least two cells that meet a first condition; determining the remaining coverage time of the at least two cells; and The remaining coverage time of at least two cells is used to determine the target cell. Based on this scheme, by determining the target cell (that is, the reselected cell) based on the remaining coverage time during the reselection process, the terminal device can reselect to a suitable cell as much as possible, avoid unnecessary frequent reselection, and save terminal equipment Energy consumption improves the efficiency of cell reselection based on high-altitude mobile platform communication scenarios.
  • determining the target cell according to the remaining coverage time of the at least two cells includes: determining that the cell with the longest remaining coverage time among the at least two cells is the target cell. Based on this solution, the target cell is determined in combination with the remaining coverage time, so that the terminal device will not be frequently reselected, thereby saving the energy consumption of the terminal device and improving the efficiency of cell reselection in the communication scenario based on the high-altitude mobile platform.
  • determining the target cell based on the remaining coverage time of the at least two cells includes: determining the remaining coverage time greater than or equal to the coverage time threshold according to the coverage remaining time of the at least two cells and the coverage time threshold.
  • the cell with the coverage time threshold is determined as a candidate cell; and the target cell is determined according to the cell quality of the candidate cell.
  • the remaining coverage time is used as a reference factor for selecting the target cell, so that terminal equipment will not be frequently reselected, thus saving the energy consumption of the terminal equipment; on the other hand, the cell quality is used as the target cell selection. Therefore, a relatively better quality cell can be selected as the target cell, which helps to improve the communication quality.
  • determining the target cell according to the cell quality of the candidate cell includes: determining the cell with the best cell quality among the candidate cells as the target cell; or, according to the candidate cell The cell quality of the cell and the remaining time of coverage of the candidate cell are determined to determine the integrated value of each cell in the candidate cell, and the target cell is determined according to the integrated value of each cell.
  • receiving reselection configuration information from a network device where the reselection configuration information includes the coverage time threshold.
  • the target frequency is measured, and before at least two cells meeting the first condition are obtained, the remaining coverage time of the serving cell of the terminal device is determined; according to the remaining coverage time and the reselection trigger time threshold , Confirm to perform cell reselection. Based on this solution, the cell reselection is triggered based on the remaining coverage time of the serving cell of the terminal device, which helps to avoid too frequent or inability to trigger cell reselection in time, so this solution can improve the communication quality of the terminal device.
  • determining to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold includes: determining that the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold , Confirm to perform cell reselection.
  • determining to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold includes: according to the remaining coverage time, the reselection trigger time threshold, and the serving cell Determine the cell reselection to be performed based on the cell quality and the reselection trigger quality threshold. Based on this solution, the remaining coverage time of the serving cell and the cell quality are combined to determine whether to perform cell reselection, which can improve the accuracy of determining the triggering reselection timing, and thus can improve the communication quality of the terminal device.
  • determining to perform cell reselection according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold includes: determining the The remaining coverage time is less than or equal to the reselection trigger time threshold, and it is determined that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and it is determined to perform cell reselection.
  • the reselection trigger quality threshold is greater than a preset first threshold.
  • determining to perform cell reselection according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold includes: determining the The remaining coverage time is less than or equal to the reselection trigger time threshold, or it is determined that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and cell reselection is determined to be performed.
  • the reselection trigger quality threshold is less than a preset second threshold.
  • the reselection trigger time threshold is received from the network device.
  • the present application provides a method for cell reselection, including: determining the remaining coverage time of a serving cell of a terminal device; and determining whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold. Based on this solution, cell reselection is triggered based on the remaining coverage time of the serving cell of the terminal device, which helps to avoid too frequent or inability to trigger cell reselection in time. Therefore, this solution can improve the communication quality of the terminal device and improve the communication quality of the terminal device. The efficiency of cell reselection in the mobile platform communication scenario.
  • determining whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold includes: determining that the remaining coverage time of the serving cell is less than or equal to the reselection trigger time Threshold, determine the implementation of cell reselection.
  • determining whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold includes: according to the remaining coverage time, the reselection trigger time threshold, and the service The cell quality of the cell and the reselection trigger quality threshold determine whether to perform cell reselection. Based on this solution, the remaining coverage time of the serving cell and the cell quality are combined to determine whether to perform cell reselection, which can improve the accuracy of determining the triggering reselection timing, and thus can improve the communication quality of the terminal device.
  • determining whether to perform cell reselection according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold includes: determining all The remaining coverage time is less than or equal to the reselection trigger time threshold, and it is determined that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and it is determined to perform cell reselection.
  • the reselection trigger quality threshold is greater than a preset first threshold.
  • determining whether to perform cell reselection according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold includes: determining all The remaining coverage time is less than or equal to the reselection trigger time threshold, or it is determined that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and cell reselection is determined to be performed.
  • the reselection trigger quality threshold is less than a preset second threshold.
  • the reselection trigger time threshold is received from the network device.
  • the present application provides a method for cell reselection.
  • the method includes: a network device sends reselection configuration information to a terminal device, where the reselection configuration information includes a coverage time threshold, and the coverage time threshold is used for the The terminal device determines the target cell.
  • the network device may also send a reselection trigger time threshold to the terminal device, where the reselection trigger time threshold is used by the terminal device to determine whether to perform cell reselection.
  • the present application provides a method for cell reselection.
  • the method includes: a network device sends a reselection trigger time threshold to a terminal device, where the reselection trigger time threshold is used by the terminal device to determine whether to perform cell reselection .
  • the present application provides a communication device that has the function of implementing the method of the first aspect or the second aspect.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the communication device includes: a processor, a memory, a bus, and a communication interface; the memory stores computer execution instructions, and the processor and the memory are connected through the bus.
  • the processing The device executes the computer-executable instructions stored in the memory, so that the device executes the cell reselection in the first aspect, or any implementation manner of the first aspect, or the second aspect, or any implementation manner of the second aspect.
  • the device may be a terminal device or the like.
  • the communication device may also be a chip, such as a chip of a terminal device.
  • the chip includes a processing unit, and optionally, a storage unit.
  • the chip may be used to perform the first aspect, or A method for cell reselection in any implementation manner of the first aspect, or the second aspect, or any implementation manner of the second aspect.
  • the present application provides a communication device that has the function of implementing the method of the third aspect or the fourth aspect.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the communication device includes: a processor, a memory, a bus, and a communication interface; the memory stores computer execution instructions, and the processor and the memory are connected through the bus.
  • the processing The device executes the computer-executable instructions stored in the memory, so that the device executes the cell reselection in the third aspect, or any implementation manner of the third aspect, or the fourth aspect, or any implementation manner of the fourth aspect.
  • the device may be a network or the like.
  • the communication device may also be a chip, such as a chip of a network device.
  • the chip includes a processing unit, and optionally, a storage unit.
  • the chip can be used to perform the third aspect, or The method of cell reselection in any implementation manner of the third aspect, or the fourth aspect, or any implementation manner of the fourth aspect.
  • the present application provides a computer storage medium that stores computer software instructions for the above-mentioned terminal device, which contains a program designed to execute any of the above-mentioned aspects.
  • the present application provides a computer storage medium that stores computer software instructions used for the above-mentioned network equipment, which contains a program designed to execute any of the above-mentioned aspects.
  • this application provides a computer program product.
  • the computer program product includes computer software instructions, and the computer software instructions can be loaded by a processor to implement the process in the cell reselection method in any of the foregoing aspects or any implementation manner of any aspect.
  • this application provides a system for cell reselection, including a terminal device and a network device; the network device is configured to send reselection configuration information to the terminal device, and the reselection configuration information includes a coverage time threshold
  • the terminal device is used to measure the target frequency point to obtain at least two cells that meet the first condition; determine the remaining coverage time of the at least two cells; according to the remaining coverage time of the at least two cells and The coverage time threshold determines the target cell.
  • this application provides a system for cell reselection, including a terminal device and a network device; the network device is configured to send a reselection trigger time threshold to the terminal device; and the terminal device is configured to determine The remaining coverage time of the serving cell of the terminal device; and determining whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold.
  • Figure 1 is a schematic diagram of a possible network architecture provided by this application.
  • Figure 2 is a schematic diagram of a transparent satellite forwarding form
  • Figure 3 is a schematic diagram of a satellite regeneration form
  • FIG. 4A is a flowchart of a method for cell reselection provided by this application.
  • FIG. 4B is a flowchart of another cell reselection method provided by this application.
  • FIG. 5 is a schematic diagram of a communication device provided by this application.
  • FIG. 6 is a schematic diagram of another communication device provided by this application.
  • Fig. 7 is a schematic diagram of a terminal device provided by this application.
  • FIG. 1 it is a schematic diagram of a network architecture to which this application applies, including terminal equipment and network equipment.
  • Network equipment is deployed on high-altitude mobile platforms, such as satellites, hot air balloons, and mobile drones.
  • the terminal device communicates with the network device through a wireless interface.
  • a terminal device is a device with a wireless transceiver function.
  • the terminal device can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (such as aircraft, Balloons and satellites are classy).
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, virtual reality (VR) terminal equipment, augmented reality (AR) terminal equipment, industrial control ( Wireless terminal equipment in industrial control, wireless terminal equipment in self-driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid, transportation safety (transportation)
  • the wireless terminal in safety the wireless terminal equipment in the smart city (smart city), the wireless terminal in the smart home (smart home), and may also include user equipment (UE) and so on.
  • UE user equipment
  • a network device is a device in a wireless network, for example, a radio access network (RAN) node that connects a terminal device to the wireless network.
  • RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB), radio network controller (RNC), Node B (Node B) B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit) , BBU), or wireless fidelity (Wifi) access point (AP), integrated access and backhaul (IAB), etc.
  • TRP transmission reception point
  • eNB evolved Node B
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base transceiver station
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • baseband unit baseband unit
  • BBU
  • the network device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.
  • the centralized unit CU node can be divided into a control plane (CU-CP) and a user plane (CU-UP).
  • CU-CP is responsible for the control plane function, mainly including RRC and PDCP-C.
  • PDCP-C is mainly responsible for encryption and decryption of control plane data, integrity protection, data transmission, etc.
  • CU-UP is responsible for user plane functions, mainly including SDAP and PDCP-U.
  • SDAP is mainly responsible for processing the data of the core network and mapping the flow to the bearer.
  • PDCP-U is mainly responsible for data encryption and decryption, integrity protection, header compression, serial number maintenance, data transmission, etc.
  • CU-CP and CU-UP are connected through the E1 interface.
  • CU-CP represents that gNB is connected to the core network through the Ng interface.
  • CU-UP is connected to DU through F1-U (user plane).
  • F1-C control plane
  • PDCP-C is also in CU-UP.
  • the network equipment in this application is deployed in a non-terrestrial communication system (non-terrestrial network, NTN).
  • the NTN system may include a satellite communication system, a high altitude platform (HAPS) communication system, or other non-terrestrial communication systems.
  • HAPS high altitude platform
  • an NTN communication system in which network equipment is deployed on a satellite will be used as an example for description in this application.
  • this application will replace “satellite” with “satellite” later in this application. That is, the communication between the terminal device and the satellite referred to later in this application actually refers to the communication between the terminal device and the network device on the satellite.
  • the communication between the terminal device and the satellite referred to later in this application actually refers to the communication between the terminal device and the network device on the satellite.
  • satellite systems can be divided into the following three categories:
  • Geostationary-Earth (Geostationary-Earth Orbit, GEO) satellites also known as geostationary satellites.
  • the speed of the satellite is the same as the earth's rotation system, so the satellite remains stationary relative to the ground.
  • the cell of the GEO satellite is also stationary.
  • the coverage of GEO satellite cells is relatively large, for example, the cell diameter may be 500 kilometers.
  • Low-Earth (Low-Earth Orbit, LEO) satellites satellites move relatively fast relative to the ground, about 7 kilometers per second, so the service coverage area provided by LEO satellites also moves.
  • Medium orbit satellites satellites between high orbit and low orbit.
  • the satellites involved in this application can be low-orbit satellites, and can also be extended to medium-orbit satellites or other mobile network devices.
  • the embodiments of the present application will be referred to simply as satellites in the following.
  • the first form is the transparent form, in which the satellite relays the cell information of the ground network equipment (such as the base station). If there is a connection between the satellite and the original network equipment when the satellite is moving, the cell of the original network equipment will follow the satellite for a while (that is, keep the connection for a period of time); when the satellite is connected to the new network equipment, the satellite will forward the cell of the new network equipment Information. In the transparent forwarding mode, the satellite receives the signal from the ground network equipment and forwards it to the ground. At this time, although the satellite is running continuously, the location of the ground network equipment remains unchanged. Therefore, although the cell under the ground network transmitted by the satellite will follow the satellite Operation, there is a certain amount of movement, but the movement range of the cell is around the periphery of the network equipment.
  • the ground network equipment such as the base station
  • FIG. 2 it is a schematic diagram of the transparent satellite forwarding form.
  • This figure illustrates an ideal scenario, that is, the ground cell is completely stationary. When one satellite is removed, the other satellite will completely cover the previous cell area.
  • the mapping method of ground stationary cells means that the location of the cell is not moving on the ground, and the moving satellites can form these cells by adjusting their own beams. The following is an example.
  • a cell can be identified by a physical cell identifier (PCI) or a cell global identifier (CGI). It should be noted that the following cells 1 to 4 refer to the cells of the ground network equipment.
  • PCI physical cell identifier
  • CGI cell global identifier
  • Time T1 Cell 1 and cell 2 are covered by the beam of satellite 1, and cell 3 and cell 4 are covered by the beam of satellite 2;
  • Time T2 Although both satellite 1 and satellite 2 move to the left, they can still adjust their beams to ensure the coverage of cell 1 to cell 4;
  • Time T3 Compared to time T1, satellite 1 and satellite 2 have moved a sufficient distance, satellite 1 cannot provide coverage for cell 2 by adjusting the beam, and satellite 2 cannot provide coverage for cell 4 by adjusting the beam. At this time, satellite 2 Can provide coverage for cell 2 and satellite 3 can provide coverage for cell 4. That is, cell 1 is covered by the beam of satellite 1, cell 2 and cell 3 are covered by the beam of satellite 2, and cell 4 is covered by the beam of satellite 3.
  • the ground coverage area of the two satellites cannot be exactly the same due to the difference in the operating direction of the satellite, the beam launching direction, and the beam launching capability.
  • the second form is the regenerative form, that is, the satellite can generate cell information by itself.
  • the satellite can be a network device with similar functions such as a DU, a base station, or an IAB.
  • the cell it generates also moves on the ground.
  • FIG. 3 it is a schematic diagram of the satellite regeneration form. It should be noted that the following cells 1 to 5 refer to satellite cells.
  • Time T1 A certain area is covered by cells 1 to 4 of satellite 1 and satellite 2;
  • Time T3 The area is covered by satellite 1, satellite 2, and satellite 3 cells 2 to 5.
  • the standard tends to be based on the location information of the terminal equipment (UE location).
  • UE location location information of the terminal equipment
  • satellite ephemeris for cell reselection because the near-far effect of the quality distribution of the cell under the satellite is not obvious (that is, the movement of the terminal device does not significantly change the service quality of the satellite because the satellite is far from the terminal device), so the terminal device will not significantly change the service quality of the satellite during the reselection process.
  • the R criterion is sorted only based on the quality, and the target cell may be reselected to the target cell that will be removed soon. For example, if the terminal device is in the serving cell, when performing reselection, if the terminal device measures target cell 1 and target cell 2 at the same time, and the quality of target cell 1 and target cell 2 meet the S criterion of the reselection process, the terminal device According to the R criterion, it is determined that the cell quality of the target cell 1 is higher than the cell quality of the target cell 2.
  • the target cell 1 may be quickly moved away, that is, the terminal device cannot be provided with services, which causes the terminal device to perform cell reselection, resulting in an increase in energy consumption of the terminal device and a waste of resources.
  • the S criterion and R criterion please refer to the relevant description in the 3rd generation partnership project (3GPP) 38.304 v15.4.0 of the 5G protocol.
  • the embodiments of the present application can solve the above-mentioned problems. It should be noted that the embodiments of this application are described using 5G communication scenarios as examples, but the embodiments of this application are not limited to 5G communication scenarios, and can also be applied to other communication scenarios, such as the 4th generation (4G). ) Communication scene or future communication scene, etc.
  • the terminal device When a terminal device is turned on or a radio link failure occurs, the terminal device will perform a cell search process and select a suitable cell to camp on as soon as possible. This process is called "cell selection”.
  • the terminal device After the terminal device camps in a cell, as the terminal device moves, the terminal device may need to be changed to another cell with a higher priority or better signal to camp on. This is the cell reselection process.
  • the terminal device When the terminal device measures multiple cells that meet the reselection criterion, the terminal device will rank the cells by a ranking value (also referred to as an R value). For example, for frequencies or systems with the same priority, when multiple cells meet the reselection criteria, ranking can be performed according to the cell quality. Generally speaking, the terminal equipment will perform cell reselection to the cell with the highest ranking value. For the terminal device to reselect the cell with the highest ranking value and further determine whether the cell is suitable, refer to the similar description of 3GPP protocol TS38.304 v15.4.0.
  • the terminal device may not simply reselect to the cell with the best ranking when performing cell reselection, such as finding the highest ranking value during ranking, and Cells with the highest ranking value within a certain range (such as x dB, where x is configurable) are considered to be similar cells. In these similar cells, the terminal device reselects to have the most good beams. Of the cell.
  • the cell quality of a cell can refer to the R value of the cell, that is, the quality of the cell quality between different cells is evaluated according to the R value of the cell; in another In the implementation method, the cell quality of a cell can also refer to the R value and beam of the cell, that is, the quality of the cell between different cells is evaluated according to the R value and beam of the cell.
  • the beam can be understood as a spatial resource, and can refer to a transmission or reception precoding vector with energy transmission directivity.
  • the directivity of energy transmission can refer to the precoding processing of the signal to be sent through the precoding vector, the signal after the precoding processing has a certain spatial directivity, and the signal after receiving the precoding vector for the precoding processing has a better performance.
  • Good received power such as meeting the signal-to-noise ratio of receiving and demodulating.
  • Energy transmission directivity may also refer to the same signal received from different spatial locations with different received power through the precoding vector.
  • the transmitted or received precoding vector can be identified by index information, and the index information can correspond to the resource identification (identity, ID) of the configured terminal device.
  • the index information can correspond to the configured reference signal identification and reference signal resource.
  • the reference signal can be used for channel measurement or channel estimation.
  • the reference signal resource can be used to configure the transmission attributes of the reference signal, for example, the position of the time-frequency resource, the port mapping relationship, the power factor, and the scrambling code. For details, please refer to the existing technology.
  • the transmitting end device may send the reference signal based on the reference signal resource, and the receiving end device may receive the reference signal based on the reference signal resource.
  • the reference signal may include, for example, a channel state information reference signal (CSI-RS), a synchronization signal block (synchronization signal block, SSB), and a sounding reference signal (sounding reference signal, SRS).
  • the reference signal resources may include CSI-RS resources (CSI-RS resources), SSB resources, and SRS resources (SRS resources).
  • CSI-RS resources CSI-RS resources
  • SSB resources synchronization signal block
  • SRS resources SRS resources
  • each reference signal resource can correspond to an identifier of a reference signal resource.
  • CSI-RS resources are distinguished by CSI-RS identifiers (such as CSI-RS index), and SSB resources are distinguished by SSB identifiers (such as SSB index) to distinguish, SRS resources are distinguished by SRS resource identifier (such as SRS resource id).
  • CSI-RS identifiers such as CSI-RS index
  • SSB resources are distinguished by SSB identifiers (such as SSB index) to distinguish
  • SRS resources are distinguished by SRS resource identifier (such as SRS resource id).
  • the configuration parameters of the current camping cell and neighboring cells will be broadcast in the system message of the current camping cell, so that the terminal device can calculate parameters such as the ranking value corresponding to the cell.
  • the threshold and N can be notified to the terminal device in a broadcast message or a unicast message or a multicast message. Among them, a beam whose beam quality is higher than the threshold is considered a good beam.
  • a cell reselection method provided in this application is used to solve the aforementioned problems in the prior art cell reselection method.
  • the embodiments of the present application may be applicable to terminal devices that need to perform cell reselection, such as terminal devices in an idle state and in an inactive state.
  • the method can be executed by a terminal device or a component (for example, a chip or a circuit, etc.) used in the terminal device.
  • the method can include the following steps:
  • Step 401a Measure the target frequency point to obtain at least two cells that meet the first condition.
  • the first condition here refers to a criterion for reselection, and the first condition is used to screen out one or more cells that meet a certain quality requirement.
  • the first condition may be that the cell quality meets a certain threshold.
  • the threshold here can be 0, or other values preset by the system or configured by the network device. "Satisfying a certain threshold” may mean that the quality of the cell is greater than or equal to the threshold, or may mean that the quality of the cell is less than or equal to the threshold.
  • the first condition may also be referred to as re-selection criteria, re-selection conditions, re-selection criteria, etc., which is not limited in this application. It is understandable that the cell quality in the embodiment of the present application may be the initial quality determined by the terminal measurement, or may be a modification based on the initial quality.
  • the terminal equipment can measure the target frequency according to the position information of the terminal equipment and the satellite orbit to obtain at least two cells that meet the first condition.
  • the satellite orbit here refers to the trajectory information of the satellite operation.
  • the target frequency point may refer to at least one of adjacent frequency points of the same frequency, different frequencies or different systems. It is understandable that the above definitions of the same frequency, different frequency, and different systems are described with respect to the information of the current serving cell of the terminal device.
  • the terminal device may determine the above-mentioned target frequency according to the reselection configuration information in the system message.
  • Step 402a Determine the remaining coverage time of the at least two cells.
  • the cell of the network device in this application is a mobile cell, so the coverage of the terminal device by the cell has a time range, or it is understood that as the cell moves, the cell will not cover the terminal device, that is, the terminal device The device is outside the coverage area of the cell. Therefore, for a terminal device, the coverage of each cell has coverage time.
  • the terminal equipment can determine the remaining coverage time of the at least two cells according to the position information of the terminal equipment and the satellite orbit.
  • the terminal device may determine the remaining coverage time of the at least two cells according to the location information of the terminal device, the satellite orbit and the moving direction of the terminal device.
  • the embodiment of the present application does not limit the manner of determining the remaining coverage time of the cell.
  • the remaining coverage time in this application may also be referred to as the remaining cell coverage time, or the remaining coverage time, etc., which are explained here in a unified manner, and will not be repeated in other places.
  • Step 403a Determine the target cell according to the remaining coverage time of the at least two cells.
  • the target cell here refers to the cell where the terminal device will be reselected, or the cell where the terminal device will reside.
  • the method for determining the target cell includes but is not limited to:
  • Method A1 Determine the cell with the longest remaining coverage time among the at least two cells as the target cell.
  • the cells that meet the first condition include cell 1, cell 2, cell 3, cell 4, and cell 5.
  • the remaining coverage time of cell 1, cell 2, cell 3, cell 4, and cell 5 for terminal equipment is T1, T2, respectively , T3, T4 and T5, and T1>T2>T3>T4>T5, then cell 1 is determined to be the target cell. It is understandable that if the cell corresponding to the longest remaining coverage time includes at least 2 cells, the terminal device may further determine the target cell based on the cell quality, or may arbitrarily determine a cell as the target cell, or determine the target cell based on the realization of the terminal device.
  • Method A2 according to the remaining coverage time and the coverage time threshold of at least two cells, determine the cell with the remaining coverage time greater than or equal to the coverage time threshold as the candidate cell, and determine the target cell according to the cell quality of the candidate cell.
  • the cells that meet the first condition include cell 1, cell 2, cell 3, cell 4, and cell 5.
  • the remaining coverage time of cell 1, cell 2, cell 3, cell 4, and cell 5 for terminal equipment is T1, T2, respectively , T3, T4, and T5, and then compare T1, T2, T3, T4, and T5 with the coverage time threshold (denoted by ThT). Assuming that T1, T2, T3, and T4 are all greater than ThT, and T5 is less than ThT, it is determined that the candidate cells include cell 1, cell 2, cell 3, and cell 4. Then, according to the cell quality of each of the candidate cells, the target cell is determined from the candidate cells.
  • the method of determining the target cell according to the cell quality of the candidate cell includes but is not limited to:
  • Method A2.1 determine the cell with the best cell quality among the candidate cells as the target cell.
  • cell 1 of the candidate cells ⁇ cell 1, cell 2, cell 3, and cell 4 ⁇ has the best quality, it is determined that cell 1 is the target cell.
  • the method for determining the cell with the best cell quality in this method includes but is not limited to:
  • the first method Measure the R value of each cell in the candidate cells (refer to the related description of the aforementioned "Cell Reselection"), and determine the cell with the largest R value as the target cell.
  • cell 1 of the candidate cells ⁇ cell 1, cell 2, cell 3, and cell 4 ⁇ has the largest R value, then cell 1 is the cell with the best cell quality, so cell 1 is the target cell.
  • the second method Measure the R value of each cell in the candidate cells, determine the cell with the largest R value, and determine the cells in the candidate cells that are within a preset range from the maximum R value. These cells can be called similar (similar) cell, and then from these similar cells, select the cell with the most good beams as the target cell.
  • the R values corresponding to each cell in the candidate cells ⁇ cell 1, cell 2, cell 3, and cell 4 ⁇ are R1, R2, R3, and R4, respectively, and R2>R1>R3>R4.
  • the difference between R1 and R2 is within the preset range
  • the difference between R3 and R2 is within the preset range
  • the difference between R4 and R2 is not within the preset range, it will be from cell 1, cell 2, and cell 3.
  • Select the target cell Further, assuming that the good beam numbers of cell 1, cell 2, and cell 3 are 5, 4, and 3, respectively, cell 1 is finally selected as the target cell.
  • the terminal device again selects cell 1 as the target cell according to the R value of the cell.
  • Method A2.2 Determine the integrated value of each cell in the candidate cell according to the cell quality of the candidate cell and the remaining coverage time of the candidate cell, and determine the target cell according to the integrated value of each cell.
  • This method comprehensively considers the cell quality and coverage remaining time of the candidate cells, calculates the comprehensive value for each cell in the candidate cells, and selects the cell with the best comprehensive value as the target cell.
  • R x is the integrated value of cell x in the candidate cells (also called the ranking value)
  • w is the weight value preset or configured by the network device
  • T x is the remaining coverage time of cell x
  • Is the sum of the remaining coverage time of all cells (N in total) in the candidate cells
  • Q x is the cell quality of cell x
  • It is the sum of the cell quality of all cells (N in total) in the candidate cells
  • N is an integer greater than 1.
  • "all cells in the candidate cells” may include cells with the same priority, or the cell set of the target cell needs to be sorted to determine the target cell.
  • Method A3 Determine the target cell according to the remaining coverage time and the coverage time threshold of the at least two cells.
  • the cells that meet the first condition include cell 1, cell 2, cell 3, cell 4, and cell 5.
  • the remaining coverage time of cell 1, cell 2, cell 3, cell 4, and cell 5 for terminal equipment is T1, T2, respectively , T3, T4, and T5, and then compare T1, T2, T3, T4, and T5 with the coverage time threshold (denoted by ThT). Assuming that T1, T2, and T2 are all greater than ThT, and T3, T4, and T5 are all less than ThT, one cell from cell 1, cell 2 can be selected as the target cell.
  • cell 1 or cell 2 is randomly selected as the target cell, or cell 1 or cell 2 is selected as the target cell based on the realization of the terminal equipment.
  • the network device may instruct the terminal device to use the above method A1 or the above method A2 or the above method A3 to determine the target cell.
  • the terminal device can also receive reselection configuration information from the network device.
  • the reselection configuration information may be sent periodically by the network device, or sent based on the request of the terminal device.
  • the reselection configuration information includes the aforementioned coverage time threshold (ThT) of the target cell.
  • the coverage time threshold may also be predefined by the protocol. In this manner, the above-mentioned reselection configuration information may not need to carry the coverage time threshold.
  • the terminal device can reselect the appropriate cell as much as possible, avoid unnecessary frequent reselection, and save
  • the energy consumption of the terminal equipment is improved, and the efficiency of cell reselection in the communication scenario based on the high-altitude mobile platform is improved.
  • the terminal device currently triggering the terminal device to perform cell reselection is also based on the cell quality of the serving cell, that is, when the quality of the serving cell meets the trigger condition, the terminal device is triggered to perform cell reselection. Then, in the satellite cell scenario, due to the existence of the near-far effect, the quality of the cells in different cells is not obvious. Therefore, the reselection is triggered only based on the cell quality. When the reselection trigger quality threshold is set to a small value, the reselection may not be timely. For example, when the satellite covering the serving cell has been removed, the reselection is triggered.
  • the communication quality is degraded; when the reselection trigger quality threshold is set to a large value, it may lead to a situation where it is easier to trigger the reselection, that is, the reselection is too frequent, and the communication quality is also degraded.
  • the cell reselection method in the prior art has the following problem: Since the near-distance effect of the cell under the network equipment of the high-altitude mobile platform is not obvious, only triggering the reselection based on the cell quality of the serving cell may cause the communication quality to decrease.
  • FIG. 4B another cell reselection method provided by this application is used to solve this problem.
  • the embodiments of the present application may be applicable to terminal devices that need to perform cell reselection, such as terminal devices in an idle state and in an inactive state.
  • the method can be executed by a terminal device or a component (such as a chip or a circuit, etc.) used in the terminal device.
  • the method can include the following steps:
  • Step 401b Determine the remaining coverage time of the serving cell of the terminal device.
  • Step 402b Determine whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold.
  • the cell reselection is triggered based on the remaining coverage time of the serving cell of the terminal device, which helps to avoid too frequent or inability to trigger cell reselection in time, so this solution can improve the communication quality of the terminal device.
  • the method for determining whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold includes, but is not limited to:
  • Method B1 Determine that the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold, and determine to perform cell reselection.
  • the cell reselection is triggered.
  • Method B2 Determine whether to perform cell reselection according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold.
  • This method not only considers whether the remaining coverage time reaches the reselection trigger time threshold, but also considers whether the cell quality of the serving cell reaches the reselection trigger quality threshold.
  • the network device may instruct the terminal device to use method B1 or method B2 to determine whether to perform cell reselection.
  • method B2 includes but are not limited to:
  • Method B2.1 Determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, and determine that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and determine to perform cell reselection.
  • the method is to determine the execution cell only when condition 1 (the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold) and condition 2 (the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold) are met at the same time. Re-elect.
  • the method can be applied to the following scenarios: when it is determined that the reselection trigger quality threshold is greater than a preset first threshold, or when it is determined that the reselection trigger quality threshold is greater than or equal to the preset first threshold, then the above method B2. 1 to determine whether to perform cell reselection. This is because: when the reselection trigger quality threshold is set to be large (specifically, greater than or equal to the first threshold), the cell quality of each cell measured by the terminal equipment is not much different due to the existence of the near-far effect, so if only Considering the cell quality factors to trigger cell reselection will make it easier to trigger cell reselection.
  • condition for triggering cell reselection is set relatively harsh (that is, condition 1 and condition 2 need to be met at the same time), which helps to control the frequency of cell reselection, thereby helping to improve terminal equipment The quality of communication.
  • Method B2.2 Determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, or determine that the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold, and determine to perform cell reselection.
  • the method is to determine the execution cell when only one of condition 1 (the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold) and condition 2 (the cell quality of the serving cell is less than or equal to the reselection trigger quality threshold) is satisfied Re-elect.
  • the method can be applied to the following scenarios: when it is determined that the reselection trigger quality threshold is less than a preset second threshold, or when it is determined that the reselection trigger quality threshold is less than or equal to the preset second threshold, then the above method B2. 2 to determine whether to perform cell reselection.
  • the reselection trigger quality threshold is set to be small (specifically, less than or equal to the second threshold), due to the existence of the near-distance effect, the cell quality of each cell measured by the terminal equipment is not much different, so if only Considering cell quality factors to trigger cell reselection will make it more difficult to trigger cell reselection.
  • the conditions for triggering cell reselection are set relatively loosely (that is, only one of condition 1 and condition 2 needs to be satisfied), which helps to trigger cell reselection in time, and thus helps to improve terminal equipment The quality of communication.
  • the foregoing reselection trigger time threshold, reselection trigger quality threshold, first threshold, and second threshold may be received from the network device, that is, the terminal device may also receive the reselection trigger time threshold, Reselect the trigger quality threshold, the first threshold, and the second threshold.
  • the above-mentioned first threshold and second threshold may be the same or different.
  • the network device may send a threshold.
  • the embodiment shown in FIG. 4A and the embodiment shown in FIG. 4B can be implemented separately or combined with each other.
  • the cell reselection can be determined based on the method of the embodiment in FIG. 4B, that is, after the cell reselection is determined to be performed according to the method of the embodiment in FIG. 4B, The method in the embodiment of FIG. 4A determines the target cell.
  • the terminal device may perform operations in the order of steps 401b, 402b, 401a, 402a, and 403a.
  • the aforementioned various parameters (such as reselection trigger time threshold, reselection trigger quality threshold, coverage time threshold, etc.) may be sent in the same or different messages.
  • the terminal device and/or the satellite can perform some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application may also perform other operations or various operations.
  • each step may be performed in a different order presented in the embodiment of the present application, and it may not be necessary to perform all the operations in the embodiment of the present application.
  • the terms and/or descriptions between different embodiments are consistent and can be mutually cited.
  • the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.
  • the method implemented by the terminal device can also be implemented by a component (such as a chip or circuit) that can be used for the terminal device
  • the method implemented by the network device can also be implemented by the method that can be used for the network device.
  • the component for example, a chip or a circuit
  • FIG. 5 shows a possible exemplary block diagram of the communication device involved in the embodiments of the present application.
  • the communication device 500 may exist in the form of software or hardware.
  • the communication device 500 may include: an acquisition unit 501, a coverage remaining time determination unit 502, and a target cell determination unit 503.
  • the communication device 500 may further include a receiving unit 504 and a reselection determining unit 505.
  • the acquisition unit 501, the coverage remaining time determination unit 502, the target cell determination unit 503, and the reselection determination unit 505 may be separately provided, or may be integrated into at least one processing unit, which is used for communication
  • the operation of the device 500 is controlled and managed.
  • the receiving unit 504 is used to support communication between the communication device 500 and other network entities.
  • the communication device 500 may further include a storage unit, the storage unit may be used to store instructions and/or data, the at least one processing unit or acquisition unit 501, the coverage remaining time determination unit 502, the target cell determination unit 503, and the re
  • the selection determining unit 505 can read the instructions and/or data in the storage unit, so that the communication device 500 implements the corresponding method.
  • the processing unit may be a processor or a controller, for example It can be a general-purpose central processing unit (central processing unit, CPU), general-purpose processor, digital signal processing (digital signal processing, DSP), application specific integrated circuits (ASIC), field programmable gate array (field programmable gate) array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of the present invention.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the receiving unit 504 may be a communication interface, a receiver, or a receiving circuit, etc., where the communication interface is a general term. In a specific implementation, the communication interface may include at least one interface.
  • the communication apparatus 500 may be a terminal device used to execute the embodiment of FIG. 4A, and may also be a chip used to execute the steps of the terminal device corresponding to the embodiment of FIG. 4A.
  • the processing unit may be, for example, a processor
  • the receiving unit 504 may be, for example, a receiver.
  • the receiver includes a radio frequency circuit.
  • the processing unit may be, for example, a processor, and the receiving unit 504 may be, for example, an input Interface, pin or circuit, etc.
  • the obtaining unit 501 is configured to measure the target frequency to obtain at least two cells that meet the first condition; the remaining coverage time determining unit 502 is configured to determine the remaining coverage time of the at least two cells; the target cell determining unit 503 , Used to determine the target cell according to the remaining coverage time of the at least two cells.
  • the target cell determining unit 503 is specifically configured to determine that the cell with the longest remaining coverage time among the at least two cells is the target cell.
  • the target cell determining unit 503 is specifically configured to determine the cells whose coverage remaining time is greater than or equal to the coverage time threshold according to the coverage remaining time and the coverage time threshold of the at least two cells It is determined as a candidate cell, and the target cell is determined according to the cell quality of the candidate cell.
  • the target cell determining unit 503 is specifically configured to determine that the cell with the best cell quality among the candidate cells is the target cell; or, according to the cell quality and the cell quality of the candidate cell The remaining time of coverage of the candidate cell is determined to determine the integrated value of each cell in the candidate cell, and the target cell is determined according to the integrated value of each cell.
  • the receiving unit 504 is configured to receive reselection configuration information from a network device, where the reselection configuration information includes the coverage time threshold.
  • the remaining coverage time determining unit 502 is further configured to determine the remaining coverage time of the serving cell of the terminal device; the reselection determining unit 505 is configured to trigger reselection according to the remaining coverage time and The time threshold determines the implementation of cell reselection.
  • the reselection determining unit 505 is specifically configured to determine that the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold, and determine to perform cell reselection.
  • the reselection determining unit 505 is specifically configured to determine according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold Perform cell reselection.
  • the reselection determining unit 505 is specifically configured to determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, and that the cell quality of the serving cell is less than or equal to all The reselection triggers the quality threshold, and the cell reselection is determined to be executed.
  • the reselection determining unit 505 is further configured to determine that the reselection trigger quality threshold is greater than a preset first threshold.
  • the reselection determining unit 505 is specifically configured to determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, or that the cell quality of the serving cell is less than or equal to The reselection triggers the quality threshold, and the cell reselection is determined to be executed.
  • the reselection determining unit 505 is further configured to determine that the reselection trigger quality threshold is less than a preset second threshold.
  • the receiving unit 504 is configured to receive the reselection trigger time threshold from a network device.
  • the device shown in FIG. 5 is a terminal device, for specific beneficial effects of the method for performing cell reselection, reference may be made to the related description in the method embodiment shown in FIG. 4A, which will not be repeated here. It can be understood that the units in the embodiments of the present application may also be referred to as modules. The above-mentioned units or modules can exist independently or integrated together.
  • FIG. 6 shows a possible exemplary block diagram of the communication device involved in the embodiments of the present application.
  • the communication device 600 may exist in the form of software or hardware.
  • the communication device 600 may include a coverage remaining time determination unit 601 and a reselection determination unit 602.
  • the communication device 600 may further include a receiving unit 603.
  • the remaining coverage time determination unit 601 and the reselection determination unit 602 may be provided separately or integrated into at least one processing unit, which is used to control and manage the actions of the communication device 600.
  • the receiving unit 603 is used to support communication between the communication device 600 and other network entities.
  • the communication device 600 may further include a storage unit, and the storage unit may be used to store instructions and/or data.
  • the at least one processing unit or the coverage remaining time determination unit 601 and the reselection determination unit 602 may read the storage unit The instructions and/or data to enable the communication device 600 to implement the corresponding method.
  • the processing unit may be a processor or a controller, for example, a CPU, a general-purpose processor, or a DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of the present invention.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the receiving unit 603 may be a communication interface, a receiver, or a receiving circuit, etc., where the communication interface is a general term. In a specific implementation, the communication interface may include at least one interface.
  • the communication device 600 may be a terminal device used to execute the embodiment of FIG. 4B, and may also be a step chip used to execute the corresponding terminal device of the embodiment of FIG. 4B.
  • the processing unit may be, for example, a processor
  • the receiving unit 603 may be, for example, a receiver
  • the receiver includes a radio frequency circuit.
  • the processing unit may be, for example, a processor
  • the receiving unit 603 may be, for example, an input interface, a pin, or a circuit.
  • the remaining coverage time determining unit 601 is configured to determine the remaining coverage time of the serving cell of the terminal device; the reselection determining unit 602 is configured to determine whether to perform cell reselection according to the remaining coverage time and the reselection trigger time threshold.
  • the reselection determining unit 602 is specifically configured to determine that the remaining coverage time of the serving cell is less than or equal to the reselection trigger time threshold, and determine to perform cell reselection.
  • the reselection determining unit 602 is specifically configured to determine according to the remaining coverage time, the reselection trigger time threshold, the cell quality of the serving cell, and the reselection trigger quality threshold Whether to perform cell reselection.
  • the reselection determining unit 602 is specifically configured to determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, and that the cell quality of the serving cell is less than or equal to all The reselection triggers the quality threshold, and the cell reselection is determined to be executed.
  • the reselection determining unit 602 is further configured to determine that the reselection trigger quality threshold is greater than a preset first threshold.
  • the reselection determining unit 602 is specifically configured to determine that the remaining coverage time is less than or equal to the reselection trigger time threshold, or that the cell quality of the serving cell is less than or equal to all.
  • the reselection triggers the quality threshold, and the cell reselection is determined to be executed.
  • the reselection determining unit 602 is further configured to determine that the reselection trigger quality threshold is less than a preset second threshold.
  • the receiving unit 603 is configured to receive the reselection trigger time threshold from the network device.
  • the communication device shown in FIG. 6 is a terminal device, for specific beneficial effects of the method for performing cell reselection, reference may be made to the related description in the method embodiment shown in FIG. 4B, which will not be repeated here. It can be understood that the units in the embodiments of the present application may also be referred to as modules. The above-mentioned units or modules can exist independently or integrated together.
  • FIG. 7 shows a simplified schematic diagram of a possible design structure of a terminal device involved in an embodiment of the present invention.
  • the terminal device 700 includes a transmitter 701, a receiver 702, and a processor 703.
  • the processor 703 may also be a controller, which is represented as "controller/processor 703" in FIG. 7.
  • the terminal device 700 may further include a modem processor 705, where the modem processor 705 may include an encoder 706, a modulator 707, a decoder 708, and a demodulator 709.
  • the transmitter 701 adjusts (for example, analog conversion, filtering, amplification, and upconversion, etc.) output samples and generates an uplink signal, which is transmitted via an antenna to the access device described in the above-mentioned embodiment. ⁇ Net equipment.
  • the antenna receives the downlink signal transmitted by the access network device in the foregoing embodiment.
  • the receiver 702 conditions (eg, filters, amplifies, down-converts, and digitizes, etc.) the signal received from the antenna and provides input samples.
  • the encoder 706 receives service data and signaling messages to be transmitted on the uplink, and processes the service data and signaling messages (for example, formatting, encoding, and interleaving).
  • the modulator 707 further processes (e.g., symbol mapping and modulation) the encoded service data and signaling messages and provides output samples.
  • the demodulator 709 processes (e.g., demodulates) the input samples and provides symbol estimates.
  • the decoder 708 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages sent to the terminal device 700.
  • the encoder 706, the modulator 707, the demodulator 709, and the decoder 708 can be implemented by a synthesized modem processor 705. These units are processed according to the wireless access technology adopted by the wireless access network. It should be noted that when the terminal device 700 does not include the modem processor 705, the foregoing functions of the modem processor 705 may also be performed by the processor 703.
  • the processor 703 controls and manages the actions of the terminal device 700, and is used to execute the processing procedure performed by the terminal device 700 in the foregoing embodiment of the present invention.
  • the processor 703 is configured to execute a processing procedure involving a terminal device in the method for cell reselection in any embodiment of the present application and/or other procedures of the technical solution described in the present application.
  • the terminal device 700 may further include a memory 704, and the memory 704 is configured to store program codes and data for the terminal device 600.
  • the embodiment of the present application also provides a communication device, which may exist in the form of software or hardware.
  • the communication device may include a sending unit for supporting communication between the communication device and other network entities.
  • the sending unit may be a communication interface, a transmitter, or a sending circuit, etc., where the communication interface is a general term.
  • the communication interface may include at least one interface.
  • the device may be a network device used to execute any of the foregoing embodiments, and may also be a chip used to implement the steps of the network device corresponding to any of the foregoing embodiments.
  • the transmitting unit may be, for example, a transmitter including a radio frequency circuit.
  • the sending unit may be, for example, an output interface, a pin, or a circuit.
  • the network device sends reselection configuration information to the terminal device, where the reselection configuration information includes a coverage time threshold, and the coverage time threshold is used by the terminal device to determine a target cell.
  • the network device may also send a reselection trigger time threshold to the terminal device, where the reselection trigger time threshold is used by the terminal device to determine whether to perform cell reselection.
  • the network device sends a reselection trigger time threshold to the terminal device, where the reselection trigger time threshold is used by the terminal device to determine whether to perform cell reselection.
  • the device may further include a processing unit for generating or determining a coverage time threshold and/or a reselection trigger time threshold.
  • the device may further include a storage unit, the storage unit may be used to store instructions and/or data, and the processing unit may read the instructions and/or data in the storage unit, so that the communication device implements the corresponding method.
  • a storage unit may be used to store instructions and/or data
  • the processing unit may read the instructions and/or data in the storage unit, so that the communication device implements the corresponding method.
  • An embodiment of the present application also provides a communication system, which includes the terminal device in any of the foregoing method embodiments and the network device in this embodiment.
  • the computer may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • the various illustrative logic units and circuits described in the embodiments of this application can be implemented by general-purpose processors, digital signal processors, application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, Discrete gates or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions.
  • the general-purpose processor may be a microprocessor.
  • the general-purpose processor may also be any traditional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration. achieve.
  • the steps of the method or algorithm described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two.
  • the software unit can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other storage medium in the art.
  • the storage medium may be connected to the processor, so that the processor can read information from the storage medium, and can store and write information to the storage medium.
  • the storage medium may also be integrated into the processor.
  • the processor and the storage medium can be arranged in the ASIC, and the ASIC can be arranged in the terminal.
  • the processor and the storage medium may also be provided in different components in the terminal.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

本申请提供小区重选的方法及装置。该方法包括：对目标频点进行测量，获取满足第一条件的至少两个小区；确定所述至少两个小区的覆盖剩余时间；根据所述至少两个小区的覆盖剩余时间，确定目标小区。基于该方案，通过在重选过程中基于覆盖剩余时间确定目标小区(即重选的小区)，使得终端设备可以尽量重选到合适的小区，避免不必要的频繁重选，节省了终端设备的能耗，提高了基于高空移动平台通信场景下的小区重选的效率。

Description

小区重选的方法及装置 技术领域
本申请涉及移动通信技术领域，尤其涉及小区重选的方法及装置。
背景技术
由于传统地面网络不能为终端设备提供无缝覆盖，特别是在大海、沙漠、空中等无法部署网络设备的地方，非陆地网络(Non-terrestrial network，NTN)被引入到第五代(the 5th generation，5G)系统中，它通过将网络设备或者部分网络设备功能部署在高空移动平台(如卫星、移动无人机、移动热气球等)上为终端设备提供无缝覆盖，并且高空移动平台受自然灾害影响较小，能提升5G系统的可靠性。
当高空移动平台不停的运行时，由于高空移动平台的网络设备下小区的质量分布的远近效应不明显(即由于高空移动平台的网络设备与终端设备的距离较远，导致终端设备的移动并不会导致该终端设备的小区质量受到显著影响)，从而使得目前仅基于小区质量进行重选的方法的效率不高。
因此，亟需一种提高基于高空移动平台通信场景下的效率的小区重选方法。
发明内容
本申请提供一种小区重选的方法及装置，用以提高在高空移动平台通信场景下进行的小区重选的效率。
第一方面，本申请提供一种小区重选的方法，包括：对目标频点进行测量，获取满足第一条件的至少两个小区；确定所述至少两个小区的覆盖剩余时间；根据所述至少两个小区的覆盖剩余时间，确定目标小区。基于该方案，通过在重选过程中基于覆盖剩余时间确定目标小区(即重选的小区)，使得终端设备可以尽量重选到合适的小区，避免不必要的频繁重选，节省了终端设备的能耗，提高了基于高空移动平台通信场景下的小区重选的效率。
在一些可能的实现方法中，根据所述至少两个小区的覆盖剩余时间，确定目标小区，包括：确定所述至少两个小区中覆盖剩余时间最长的小区，为所述目标小区。基于该方案，结合覆盖剩余时间确定目标小区，从而使得终端设备不会发生频繁重选的情形，因而可以节省终端设备的能耗，提高了基于高空移动平台通信场景下的小区重选的效率。
在一些可能的实现方法中，根据所述至少两个小区的覆盖剩余时间，确定目标小区，包括：根据所述至少两个小区的覆盖剩余时间和覆盖时间门限，将覆盖剩余时间大于或者等于所述覆盖时间门限的小区确定为候选小区；根据所述候选小区的小区质量，确定所述目标小区。基于该方案，一方面结合覆盖剩余时间作为选择目标小区的参考因素，从而使得终端设备不会发生频繁重选的情形，因而可以节省终端设备的能耗；另一方面结合小区质量作为选择目标小区的参考因素，从而可以选择一个相对质量较好的小区作为目标小区，有助于提升通信质量。
在一些可能的实现方法中，根据所述候选小区的小区质量，确定所述目标小区，包括：确定所述候选小区中小区质量最好的小区，为所述目标小区；或者，根据所述候选小区的 小区质量和所述候选小区的覆盖剩余时间，确定所述候选小区中各个小区的综合值，根据各个小区的综合值，确定所述目标小区。
在一些可能的实现方法中，接收来自网络设备的重选配置信息，所述重选配置信息包括所述覆盖时间门限。
在一些可能的实现方法中，对目标频点进行测量，获取满足第一条件的至少两个小区之前，确定终端设备的服务小区的覆盖剩余时间；根据所述覆盖剩余时间和重选触发时间门限，确定执行小区重选。基于该方案，基于终端设备的服务小区的覆盖剩余时间来触发执行小区重选，有助于避免过于频繁或不能及时触发小区重选，因而该方案可以提升终端设备的通信质量。
在一些可能的实现方法中，根据所述覆盖剩余时间和所述重选触发时间门限，确定执行小区重选，包括：确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
在一些可能的实现方法中，根据所述覆盖剩余时间和所述重选触发时间门限，确定执行小区重选，包括：根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定执行小区重选。基于该方案，结合了服务小区的覆盖剩余时间和小区质量来确定是否执行小区重选，可以提升确定触发重选时机的准确性，因而可以提升终端设备的通信质量。
在一些可能的实现方法中，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定执行小区重选，包括：确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一些可能的实现方法中，确定所述重选触发质量门限大于预设的第一阈值。
在一些可能的实现方法中，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定执行小区重选，包括：确定所述覆盖剩余时间小于或等于所述重选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一些可能的实现方法中，确定所述重选触发质量门限小于预设的第二阈值。
在一些可能的实现方法中，接收来自网络设备的所述重选触发时间门限。
第二方面，本申请提供一种小区重选的方法，包括：确定终端设备的服务小区的覆盖剩余时间；根据所述覆盖剩余时间和所述重选触发时间门限，确定是否执行小区重选。基于该方案，基于终端设备的服务小区的覆盖剩余时间来触发执行小区重选，有助于避免过于频繁或不能及时触发小区重选，因而该方案可以提升终端设备的通信质量，提高了基于高空移动平台通信场景下的小区重选的效率。
在一些可能的实现方法中，根据所述覆盖剩余时间和所述重选触发时间门限，确定是否执行小区重选，包括：确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
在一些可能的实现方法中，根据所述覆盖剩余时间和所述重选触发时间门限，确定是否执行小区重选，包括：根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定是否执行小区重选。基于该方案，结合了服务小区的覆盖剩余时间和小区质量来确定是否执行小区重选，可以提升确定触发重选时机的 准确性，因而可以提升终端设备的通信质量。
在一些可能的实现方法中，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定是否执行小区重选，包括：确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一些可能的实现方法中，确定所述重选触发质量门限大于预设的第一阈值。
在一些可能的实现方法中，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和所述重选触发质量门限，确定是否执行小区重选，包括：确定所述覆盖剩余时间小于或等于所述重选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一些可能的实现方法中，确定所述重选触发质量门限小于预设的第二阈值。
在一些可能的实现方法中，接收来自网络设备的所述重选触发时间门限。
第三方面，本申请提供一种小区重选的方法，该方法包括：网络设备向终端设备发送重选配置信息，所述重选配置信息包括覆盖时间门限，所述覆盖时间门限用于所述终端设备确定目标小区。
在一些可能的实现方法中，网络设备还可以向终端设备发送重选触发时间门限，所述重选触发时间门限用于所述终端设备确定是否执行小区重选。
第四方面，本申请提供一种小区重选的方法，该方法包括：网络设备向终端设备发送重选触发时间门限，所述重选触发时间门限用于所述终端设备确定是否执行小区重选。
第五方面，本申请提供一种通信装置，该装置具有实现上述第一方面或者第二方面的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元或者模块。
在一种可能的设计中，该通信装置包括：处理器、存储器、总线和通信接口；该存储器存储有计算机执行指令，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第一方面、或第一方面的任意实现方式、或第二方面、或第二方面的任意实现方式中的小区重选的方法。例如，该装置可以是终端设备等。
在另一种可能的设计中，该通信装置还可以是芯片，如终端设备的芯片，该芯片包括处理单元，可选地，还包括存储单元，该芯片可用于执行如上述第一方面、或第一方面的任意实现方式、或第二方面、或第二方面的任意实现方式中的小区重选的方法。
第六方面，本申请提供一种通信装置，该装置具有实现上述第三方面或者第四方面的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元或者模块。
在一种可能的设计中，该通信装置包括：处理器、存储器、总线和通信接口；该存储器存储有计算机执行指令，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第三方面、或第三方面的任意实现方式、或第四方面、或第四方面的任意实现方式中的小区重选的方法。例如，该装置可以是网络等。
在另一种可能的设计中，该通信装置还可以是芯片，如网络设备的芯片，该芯片包括处理单元，可选地，还包括存储单元，该芯片可用于执行如上述第三方面、或第三方面的 任意实现方式、或第四方面、或第四方面的任意实现方式中的小区重选的方法。
第七方面，本申请提供一种计算机存储介质，储存有为上述终端设备所用的计算机软件指令，其包含用于为执行上述任意方面所设计的程序。
第八方面，本申请提供一种计算机存储介质，储存有为上述网络设备所用的计算机软件指令，其包含用于为执行上述任意方面所设计的程序。
第九方面，本申请提供一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述任意方面或任意方面的任意实现方式中的小区重选的方法中的流程。
第十方面，本申请提供一种小区重选的系统，包括终端设备和网络设备；所述网络设备，用于向所述终端设备发送重选配置信息，所述重选配置信息包括覆盖时间门限；所述终端设备，用于对目标频点进行测量，获取满足第一条件的至少两个小区；确定所述至少两个小区的覆盖剩余时间；根据所述至少两个小区的覆盖剩余时间和所述覆盖时间门限，确定目标小区。
第十一方面，本申请提供一种小区重选的系统，包括终端设备和网络设备；所述网络设备，用于向所述终端设备发送重选触发时间门限；所述终端设备，用于确定所述终端设备的服务小区的覆盖剩余时间；根据所述覆盖剩余时间和所述重选触发时间门限，确定是否执行小区重选。
附图说明
图1为本申请提供的一种可能的网络架构示意图；
图2为卫星透明转发形式的一个示意图；
图3为卫星再生形式的一个示意图；
图4A为本申请提供的一种小区重选的方法流程图；
图4B为本申请提供的又一种小区重选的方法流程图；
图5为本申请提供的一种通信装置示意图；
图6为本申请提供的又一种通信装置示意图；
图7为本申请提供的一种终端设备示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。其中，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
如图1所示，为本申请所适用的一种网络架构示意图，包括终端设备和网络设备。网络设备部署在高空移动平台，如卫星、热气球、移动无人机等。该终端设备通过无线接口与网络设备通信。
终端设备是一种具有无线收发功能的设备，终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality， AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程医疗(remote medical)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端，以及还可以包括用户设备(user equipment，UE)等。
网络设备，是无线网络中的设备，例如将终端设备接入到无线网络的无线接入网(radio access network，RAN)节点。目前，一些RAN节点的举例为：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)、接入回传一体化(integrated access and backhaul，IAB)等。在一种网络结构中，网络设备可以包括集中单元(centralized unit，CU)节点、或分布单元(distributed unit，DU)节点、或包括CU节点和DU节点的RAN设备。在一种网络结构中，集中单元CU节点可以划分为控制面(CU-CP)和用户面(CU-UP)。其中CU-CP负责控制面功能，主要包含RRC和PDCP-C。PDCP-C主要负责控制面数据的加解密，完整性保护，数据传输等。CU-UP负责用户面功能，主要包含SDAP和PDCP-U。其中SDAP主要负责将核心网的数据进行处理并将flow映射到承载。PDCP-U主要负责数据面的加解密，完整性保护，头压缩，序列号维护，数据传输等。其中CU-CP和CU-UP通过E1接口连接。CU-CP代表gNB通过Ng接口和核心网连接。通过F1-C(控制面)和DU连接。CU-UP通过F1-U(用户面)和DU连接。当然还有一种可能的实现是PDCP-C也在CU-UP。需要说明的是，本申请中的网络设备是部署在非地面通信系统(non-terrestrial network，NTN)中的。
NTN系统可以包括卫星通信系统、高空平台(high altitude platform station，HAPS)通信系统或者其它非地面的通信系统。
为便于说明和理解本发明方案，本申请后续将以网络设备部署在卫星上的NTN通信系统为例进行说明。并且，为描述方便，本申请后续将“卫星上的网络设备”用“卫星”进行替代说明。也即，本申请后续涉及的终端设备与卫星之间的通信，实际上指的是终端设备与卫星上的网络设备之间的通信。这里统一说明，后续不再赘述。
按照卫星高度，即卫星轨位高度，可以将卫星系统分为如下三类：
1)高轨(Geostationary-Earth Orbit，GEO)卫星：又称为静止卫星，卫星运动速度与地球自转系统相同，因此卫星相对地面保持静止状态，对应的，GEO卫星的小区也静止的。GEO卫星小区的覆盖较大，例如小区直径可能为500千米。
2)低轨(Low-Earth Orbit，LEO)卫星：卫星相对地面移动较快，大约7千米/秒，因此LEO卫星提供的服务覆盖区域也随之移动。
3)中轨卫星：介于高轨与低轨之间的卫星。
本申请涉及的卫星可以是低轨卫星，也可以扩展到中轨卫星或其它移动的网络设备。为便于说明，本申请实施例后续简称为卫星。
卫星提供服务覆盖区域时，一般有两种形式。
第一种形式为透明转发(transparent)形式，卫星转发地面网络设备(如基站)的小区 的信息。如果卫星移动时，卫星和原网络设备的连接存在，则原网络设备的小区跟着卫星走一会(即保持一段时间的连接)；当卫星连接至新网络设备，则卫星转发新网络设备的小区的信息。透明转发形式中，卫星接收地面网络设备的信号并转发到地面，此时虽然卫星不停的运行，但是地面网络设备的位置不变，因此卫星转发的地面网络下的小区虽然也会随卫星的运行，有一定的移动，但是该小区的移动范围都是围绕网络设备的周边。
如图2所示，为卫星透明转发形式的一个示意图。该图示例了一种理想场景，即地面小区完全静止，当一个卫星移走后，另一个卫星会完全覆盖之前的小区区域。地面静止小区的映射方式是指小区的位置在地面是不动的，移动的卫星可以通过调整自己的波束形成这些小区。下面举例说明。
一种可能的设计，一个小区可以用物理小区标识(Physical Cell Identifier，PCI)或者全局小区标识(cell global identifier，CGI)来标识。需要说明的是，以下小区1至小区4指的是地面网络设备的小区。
T1时刻：小区1和小区2由卫星1的波束覆盖，小区3和小区4由卫星2的波束覆盖；
T2时刻：虽然卫星1和卫星2都向左移动，但是依然可以调整自己的波束，保证小区1至小区4的覆盖；
T3时刻：相比T1时刻，卫星1和卫星2已经移动了足够的距离，卫星1无法通过调整波束再为小区2提供覆盖，卫星2无法通过调整波束为小区4提供覆盖，此时，卫星2可以为小区2提供覆盖，而卫星3可以为小区4提供覆盖。即小区1由卫星1的波束覆盖，小区2和小区3由卫星2的波束覆盖，小区4由卫星3的波束覆盖。
一般情况下，由于卫星的运行方向，波束发射方向，波束发射能力的不同，2个卫星的地面覆盖区域无法完全相同。
第二种形式为再生(regenerative)形式，即卫星可以自己生成小区信息。比如，该形式下，卫星可以为DU、基站或者IAB等类似功能的网络设备。当卫星移动时，其生成的小区也跟随在地面上移动。
如图3所示，为卫星再生形式的一个示意图。需要说明的是，以下小区1至小区5指的是卫星的小区。
T1时刻：某个区域由卫星1和卫星2的小区1至小区4进行覆盖；
T3时刻：该区域由卫星1,卫星2及卫星3的小区2至小区5进行覆盖。
针对上述两种转发形式的卫星，当卫星小区不停的运行时，对于支持全球卫星定位系统(global navigation satellite system，GNSS)的终端设备，标准中倾向终端设备基于终端设备的位置信息(UE location)和卫星轨迹(satellite ephemeris)进行小区重选。然而，由于卫星下小区的质量分布的远近效应不明显(即由于卫星距离终端设备较远，导致终端设备的移动并不会显著改变该卫星的服务质量)，因此终端设备在重选过程中，对于满足S准则的多个候选小区仅基于质量进行R准则排序，可能会重选到很快移走的目标小区。举例来说，终端设备处于服务小区，执行重选时，如果终端设备同时测量到了目标小区1和目标小区2，且目标小区1和目标小区2的质量都满足重选过程的S准则，终端设备根据R准则确定目标小区1的小区质量高于目标小区2的小区质量。但是由于卫星的移动，该目标小区1可能会很快移走了，即不能为终端设备提供服务，导致终端设备又需要进行小区重选，造成终端设备能耗的增加和资源的浪费。其中，关于S准则和R准则可以参考5G 协议第三代合作伙伴计划(the 3rd generation partnership project，3GPP)38.304 v15.4.0中的相关描述。
因此，将现有技术中的小区重选流程应用到高空移动平台场景时，存在以下问题：
由于高空移动平台的网络设备下的小区的远近效应不明显，仅基于重选过程中测量到的候选小区质量进行重选，可能会带来不必要的终端设备能耗和资源的浪费。
本申请实施例可以解决上述问题。需要说明的是，本申请实施例是以5G通信场景作为示例进行说明的，但本申请实施例并不限于5G通信场景，还可以应用于其他通信场景，如第四代(the 4th generation，4G)通信场景或未来通信场景等。
在介绍本申请实施例之前，为便于理解本申请内容，下面先对现有技术的5G场景下的小区选择和小区重选的过程做简单介绍说明。
一、小区选择
当终端设备开机或发生无线链路失败等情况时，终端设备将执行小区搜索过程，并尽快选择合适的小区驻留，这个过程称为“小区选择”。
二、小区重选
当终端设备驻留在一个小区后，随着终端设备的移动，终端设备可能需要更换到另一个更高优先级或更好信号的小区驻留，这就是小区重选过程。
当终端设备测量到多个满足重选准则的小区时，终端设备会对小区进行ranking值(也可以称为R值)的排序。比如对于同一优先级的频率或系统，有多个小区满足重选准则时，可以根据小区质量进行ranking排序。一般来说，终端设备会执行小区重选到ranking值最高的小区。终端设备重选到ranking值最高的小区并进一步确定小区是否合适，可以参考3GPP协议TS38.304 v15.4.0的类似描述。
此外，可选的，在5G场景或者小区具有波束(beam)的场景中，终端设备执行小区重选时可以不是简单重选到排序最好的小区，例如找出排序时的最高ranking值，与最高ranking值相差一定范围内(如x dB，其中x是可配置的)的小区都认为是相近(similar)小区，在这些相近小区中，终端设备重选到拥有最多好波束(good beam)数的小区。即本申请实施例中，在一种实现方法中，小区的小区质量可以指的是小区的R值，即根据小区的R值来评价不同小区之间的小区质量的好坏；在另一种实现方法中，小区的小区质量还可以指的是该小区的R值和波束，即根据小区的R值和波束来评价不同小区之间的小区质量的好坏。
一种可能的方式中，波束可以理解为空间资源，可以指具有能量传输指向性的发送或接收预编码向量。
能量传输指向性可以指通过预编码向量对所需发送的信号进行预编码处理，经过该预编码处理的信号具有一定的空间指向性，接收经过该预编码向量进行预编码处理后的信号具有较好的接收功率，如满足接收解调信噪比等。能量传输指向性也可以指通过该预编码向量接收来自不同空间位置发送的相同信号具有不同的接收功率。
该发送或接收预编码向量能够通过索引信息进行标识，该索引信息可以对应配置终端设备的资源标识(identity，ID)，比如，索引信息可以对应配置的参考信号的标识与参考信号资源。参考信号可用于信道测量或者信道估计等。参考信号资源可用于配置参考信号的传输属性，例如，时频资源位置、端口映射关系、功率因子以及扰码等，具体可参考现 有技术。发送端设备可基于参考信号资源发送参考信号，接收端设备可基于参考信号资源接收参考信号。
其中，参考信号例如可以包括信道状态信息参考信号(channel state information reference signal，CSI-RS)、同步信号块(synchronization signal block，SSB)以及探测参考信号(sounding reference signal，SRS)。与此对应地，参考信号资源可以包括CSI-RS资源(CSI-RS resource)、SSB资源、SRS资源(SRS resource)。为了区分不同的参考信号资源，每个参考信号资源可对应于一个参考信号资源的标识，例如，CSI-RS资源通过CSI-RS标识(如CSI-RS index)来区分、SSB资源通过SSB标识(如SSB index)来区分、SRS资源通过SRS资源标识(如SRS resource id)来区分。
需要注意的是：在当前驻留的小区的系统消息中会广播当前驻留小区和邻区的配置参数，从而终端设备能计算得出小区对应的ranking值等参数。每个小区的信号强度高于门限的至多N个beam会被用来生成小区质量(cell quality)，小区质量经过层3过滤后作为Qmeas。门限和N可以在广播消息或者单播消息或者组播消息中通知终端设备。其中，波束质量高于门限的beam被认为是good beam。
结合图1所示的架构，结合图2或图3所示的场景，下面给出解决上述问题的实现方案。
如图4A所示，为本申请提供的一种小区重选方法，该方法用于解决上述提到的现有技术的小区重选方法中存在的问题。本申请实施例可以适用需要执行小区重选的终端设备，比如空闲态，去活动态的终端设备。该方法可由终端设备、或用于终端设备的部件(例如芯片或者电路等)执行。
该方法可以包括以下步骤：
步骤401a，对目标频点进行测量，获取满足第一条件的至少两个小区。
这里的第一条件指的是用于重选的准则，该第一条件用于筛选出满足一定质量要求的一个或者多个小区。作为一种示例，该第一条件可以是小区质量满足一定门限。此处的门限可以是0，或者系统预设的或者网络设备配置的其它值。“满足一定门限”可以是小区的质量大于或者等于该门限，或者可以是小区的质量小于或等于该门限。该第一条件也可以称为重选准则、重选条件、重选标准等，对此本申请不做限定。可以理解的是，本申请实施例中的小区质量可以是终端测量确定的初始质量，也可以是基于初始质量的变形。
以网络设备部署于卫星上为例，则终端设备可以根据终端设备的位置信息和卫星星轨，对目标频点进行测量，获得满足第一条件的至少两个小区。这里的卫星星轨指的是卫星运行的轨迹信息。目标频点可以指同频、异频或异系统的相邻频点中的至少一种。可以理解的，上述同频、异频、异系统的定义是相对终端设备的当前服务小区的信息进行描述的。一种可能的方式中，终端设备可以根据系统消息中的重选配置信息确定上述目标频点。
步骤402a，确定该至少两个小区的覆盖剩余时间。
本申请中网络设备的小区是移动小区，因此小区对于该终端设备的覆盖是有时间范围的，或者理解为随着小区的移动，该小区将不会对该终端设备进行覆盖，也即该终端设备处于小区的覆盖范围之外。因此，对于一个终端设备而言，各个小区的覆盖都是有覆盖时间的。
以网络设备部署于卫星上为例，则终端设备可以根据终端设备的位置信息和卫星星轨， 确定上述至少两个小区的覆盖剩余时间。或者，终端设备可以根据终端设备的位置信息、卫星星轨和终端设备的移动方向，确定上述至少两个小区的覆盖剩余时间。本申请实施例对于确定小区的覆盖剩余时间的方式不做限定。
需要说明的是，本申请中的覆盖剩余时间也可以称为小区覆盖剩余时间、或剩余覆盖时间等，这里统一说明，其他地方不再赘述。
步骤403a，根据该至少两个小区的覆盖剩余时间，确定目标小区。
这里的目标小区指的是终端设备将要重选到的小区，或者说是终端设备将要驻留的小区。
其中，根据该至少两个小区的覆盖剩余时间，确定目标小区的方法包括但不限于：
方法A1，确定该至少两个小区中覆盖剩余时间最长的小区，为目标小区。
比如，满足第一条件的小区包括小区1、小区2、小区3、小区4和小区5，小区1、小区2、小区3、小区4和小区5对终端设备的覆盖剩余时间分别为T1、T2、T3、T4和T5，并且，T1>T2>T3>T4>T5，则确定小区1为目标小区。可以理解的，若最长覆盖剩余时间对应的小区包括至少2个小区，终端设备可以进一步根据小区质量确定目标小区，或者可以任意确定一个小区作为目标小区，或者基于终端设备实现确定目标小区。
方法A2，根据至少两个小区的覆盖剩余时间和覆盖时间门限，将覆盖剩余时间大于或者等于所述覆盖时间门限的小区确定为候选小区，并根据候选小区的小区质量确定目标小区。
比如，满足第一条件的小区包括小区1、小区2、小区3、小区4和小区5，小区1、小区2、小区3、小区4和小区5对终端设备的覆盖剩余时间分别为T1、T2、T3、T4和T5，然后将T1、T2、T3、T4和T5分别与覆盖时间门限(用ThT表示)进行比较。假设T1、T2、T3和T4均大于ThT，T5小于ThT，则确定候选小区包括小区1、小区2、小区3和小区4。然后，根据候选小区中各个小区的小区质量，从候选小区中确定目标小区。
其中，根据候选小区的小区质量确定目标小区的方法包括但不限于：
方法A2.1，确定候选小区中小区质量最好的小区，为目标小区。
接着上述示例，假设候选小区{小区1、小区2、小区3和小区4}中的小区1的质量最好，则确定小区1为目标小区。
需要说明的是，该方法中确定小区质量最好的小区的方法包括但不限于：
第一种方法：测得候选小区中每个小区的R值(参考前述“小区重选”的相关描述)，确定R值最大的小区为目标小区。
作为示例，假设上述候选小区{小区1、小区2、小区3和小区4}中的小区1的R值最大，则小区1即为小区质量最好的小区，因此小区1为目标小区。
第二种方法：测得候选小区中每个小区的R值，确定R值最大的小区，并确定候选小区中的与该最大R值相差预设范围内的小区，这些小区可以称为相近(similar)小区，然后从这些相近小区中，选择拥有最多good beam数的小区作为目标小区。
作为示例，假设上述候选小区{小区1、小区2、小区3和小区4}中各个小区对应的R值分别为R1、R2、R3和R4，且R2>R1>R3>R4。假设R1与R2的差值在预设范围内，R3与R2的差值在预设范围内，R4与R2的差值不在预设范围内，则将会从小区1、小区2和小区3中选择目标小区。进一步的，假设小区1、小区2和小区3的good beam数分别为5、4、3，则最终选择小区1为目标小区。可以看出，尽管小区2的R值最大，但结合 good beam数，认为小区1的小区质量较好且小区质量较稳定，因此选择小区1作为目标小区。可以理解的，若小区1、小区2和小区3的good beam数分别为5,4,5，则最终选择小区1为目标小区，即小区1和小区3的质量都较好，进一步根据good beam进行判断，由于good beam数相同，终端设备再次根据小区的R值选择小区1作为目标小区。
方法A2.2，根据候选小区的小区质量和候选小区的覆盖剩余时间确定候选小区中各个小区的综合值，根据各个小区的综合值确定目标小区。
该方法综合考虑了候选小区的小区质量和覆盖剩余时间，对候选小区中的各个小区分别计算综合值，并选择综合值最佳的小区作为目标小区。
下面给出一个计算示例。
Figure PCTCN2019108726-appb-000001
其中，R x为候选小区中的小区x的综合值(也可以称为ranking值)，w为预设的或者网络设备配置的权重值，T x为小区x的覆盖剩余时间，
Figure PCTCN2019108726-appb-000002
为候选小区中的所有小区(共N个)的覆盖剩余时间之和，Q x为小区x的小区质量，
Figure PCTCN2019108726-appb-000003
为候选小区中的所有小区(共N个)的小区质量之和，N为大于1的整数。一些可能的方案中，“候选小区中的所有小区”可以包括具有相同优先级的小区，或者，需要进行排序确定目标小区的小区集合。
方法A3，根据至少两个小区的覆盖剩余时间和覆盖时间门限确定目标小区。
比如，满足第一条件的小区包括小区1、小区2、小区3、小区4和小区5，小区1、小区2、小区3、小区4和小区5对终端设备的覆盖剩余时间分别为T1、T2、T3、T4和T5，然后将T1、T2、T3、T4和T5分别与覆盖时间门限(用ThT表示)进行比较。假设T1、T2、均大于ThT，T3，T4和T5均小于ThT，则可以从小区1、小区2中选择一个小区作为目标小区。例如随机选择小区1或小区2作为目标小区，或者是基于终端设备的实现选择小区1或小区2作为目标小区。
可以理解的，作为一种实现方式，网络设备可以指示终端设备采用上述方法A1或上述方法A2或上述方法A3确定目标小区。
作为一种实现方法，终端设备还可以接收来自网络设备的重选配置信息。该重选配置信息可以是网络设备周期性发送的，也可以是基于终端设备的请求发送的。可选的，该重选配置信息包括目标小区的上述覆盖时间门限(ThT)。或者，该覆盖时间门限也可以是协议预定义的，该方式下，上述重选配置信息可以不需要携带覆盖时间门限。
基于上述方案，通过在重选过程中引入基于覆盖剩余时间作为确定目标小区(即重选的小区)的因素，使得终端设备可以尽量重选到合适的小区，避免不必要的频繁重选，节省了终端设备的能耗，提高了基于高空移动平台通信场景下的小区重选的效率。
此外，目前触发终端设备执行小区重选也是基于服务小区的小区质量，即当服务小区的质量满足触发条件时，则触发终端设备进行小区重选。然后在卫星小区场景中，同样由 于远近效应的存在，导致不同小区的小区质量差距不明显。因此仅基于小区质量触发重选，当重选触发质量门限设置的较小时，将导致可能会出现重选不及时的情形，比如，当覆盖服务小区的卫星已经移走后才触发重选，造成通信质量下降；当重选触发质量门限设置的较大时，将导致可能会出现比较容易触发重选的情形，即造成重选过于频繁，同样造成通信质量下降。
因此，现有技术的小区重选方法中，存在以下问题：由于高空移动平台的网络设备下的小区的远近效应不明显，仅基于服务小区的小区质量触发重选，可能会造成通信质量下降。
如图4B所示，为本申请提供的又一种小区重选方法，该方法用于解决该问题。本申请实施例可以适用需要执行小区重选的终端设备，比如空闲态，去活动态的终端设备。该方法可由终端设备、或用于终端设备的部件(如芯片或者电路等)执行。
该方法可以包括以下步骤：
步骤401b，确定终端设备的服务小区的覆盖剩余时间。
其中，确定终端设备的服务小区的覆盖剩余时间的方法，可以参考图4A实施例的相关描述。
步骤402b，根据覆盖剩余时间和重选触发时间门限，确定是否执行小区重选。
基于该方案，基于终端设备的服务小区的覆盖剩余时间来触发执行小区重选，有助于避免过于频繁或不能及时触发小区重选，因而该方案可以提升终端设备的通信质量。
上述步骤402b中，根据覆盖剩余时间和重选触发时间门限确定是否执行小区重选的方法包括但不限于：
方法B1，确定服务小区的覆盖剩余时间小于或等于重选触发时间门限，确定执行小区重选。
即在服务小区的覆盖剩余时间小于或等于重选触发时间门限的情况下，触发执行小区重选。
方法B2，根据覆盖剩余时间、重选触发时间门限、服务小区的小区质量和重选触发质量门限，确定是否执行小区重选。
该方法不仅考虑了覆盖剩余时间是否达到重选触发时间门限，还考虑了服务小区的小区质量是否达到了重选触发质量门限。
可以理解的，作为一种实现方式，网络设备可以指示终端设备采用方法B1还是方法B2确定是否执行小区重选。
该方法B2的具体实现方法包括但不限于：
方法B2.1，确定覆盖剩余时间小于或等于重选触发时间门限、且确定服务小区的小区质量小于或等于重选触发质量门限，确定执行小区重选。
该方法是在条件1(服务小区的覆盖剩余时间小于或等于重选触发时间门限)和条件2(服务小区的小区质量小于或等于重选触发质量门限)同时满足的情况下，才确定执行小区重选。
比如，该方法可以应用于以下场景：确定重选触发质量门限大于预设的第一阈值时，或者是确定重选触发质量门限大于或等于预设的第一阈值时，则通过上述方法B2.1来判断否是执行小区重选。这是因为：当重选触发质量门限设置的较大(具体的，大于或等于第一阈值)时，由于远近效应的存在，终端设备测得的各个小区的小区质量相差不大，因而 若仅考虑小区质量因素触发小区重选，将会导致比较容易触发小区重选。因此，该方法B2.1中将触发小区重选的条件设置的较为苛刻(即条件1和条件2需要同时满足)，这样有助于控制小区重选的频繁性，进而有助于提升终端设备的通信质量。
方法B2.2，确定覆盖剩余时间小于或等于重选触发时间门限、或确定服务小区的小区质量小于或等于重选触发质量门限，确定执行小区重选。
该方法是在条件1(服务小区的覆盖剩余时间小于或等于重选触发时间门限)和条件2(服务小区的小区质量小于或等于重选触发质量门限)只要有一个满足时，则确定执行小区重选。
比如，该方法可以应用于以下场景：确定重选触发质量门限小于预设的第二阈值时，或者是确定重选触发质量门限小于或等于预设的第二阈值时，则通过上述方法B2.2来判断否是执行小区重选。这是因为：当重选触发质量门限设置的较小(具体的，小于或等于第二阈值)时，由于远近效应的存在，终端设备测得的各个小区的小区质量相差不大，因而若仅考虑小区质量因素触发小区重选，将会导致比较难以触发小区重选。因此，该方法B2.2中将触发小区重选的条件设置的较为宽松(即条件1和条件2只要满足一个即可)，这样有助于及时触发小区重选，进而有助于提升终端设备的通信质量。
作为一种实现方法，上述重选触发时间门限、重选触发质量门限、第一阈值、第二阈值可以是从网络设备接收的，即终端设备还可以接收来自网络设备的重选触发时间门限、重选触发质量门限、第一阈值、第二阈值。其中上述第一阈值和第二阈值可以相同，也可以不同。当第一阈值和第二阈值相同时，网络设备可以发送一个阈值。
需要说明的是，上述图4A所示的实施例与图4B所示的实施例可以单独实施，也可以相互结合。作为一种可能的结合方式，当二者相结合实施时，可以基于图4B实施例的方法确定执行小区重选，也就是说在按照图4B实施例的方法确定执行小区重选后，再按照图4A实施例的方法确定目标小区。可选的，作为一种可能的组合实施方式，终端设备可以按照步骤401b、402b、401a、402a、403a的顺序执行操作。可选的，在该组合实施方式中，上述各个参数(如重选触发时间门限、重选触发质量门限、覆盖时间门限等)可以是在相同或者不同的消息中发送的。
可以理解的，本申请实施例中，终端设备和/或卫星可以执行本申请实施例中的部分或全部步骤，这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者各种操作的变形。此外，各个步骤可以按照本申请实施例呈现的不同的顺序来执行，并且有可能并非要执行本申请实施例中的全部操作。在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
可以理解的是，上述方法实施例中，由终端设备实现的方法，也可以由可用于终端设备的部件(例如芯片或者电路)实现，由网络设备实现的方法，也可以由可用于网络设备的部件(例如芯片或者电路)实现，本申请实施例对此不作限定。
图5示出了本申请实施例中所涉及的通信装置的可能的示例性框图，该通信装置500可以以软件或者硬件的形式存在。通信装置500可以包括：获取单元501、覆盖剩余时间确定单元502和目标小区确定单元503。可选的，该通信装置500还可以包括接收单元504和重选确定单元505。作为一种实现方式，获取单元501、覆盖剩余时间确定单元502、目标小区确定单元503和重选确定单元505可以单独设置，也可以集成于至少一个处理单元， 该至少一个处理单元用于对通信装置500的动作进行控制管理。接收单元504用于支持通信装置500与其他网络实体的通信。可选的，通信装置500还可以包括存储单元，该存储单元可以用于存储指令和/或数据，该至少一个处理单元或者获取单元501、覆盖剩余时间确定单元502、目标小区确定单元503和重选确定单元505可以读取存储单元中的指令和/或数据，以使得通信装置500实现相应的方法。
一种可能的方式中，当获取单元501、覆盖剩余时间确定单元502、目标小区确定单元503和重选确定单元505集成于至少一个处理单元时，该处理单元可以是处理器或控制器，例如可以是通用中央处理器(central processing unit，CPU)，通用处理器，数字信号处理(digital signal processing，DSP)，专用集成电路(application specific integrated circuits，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。接收单元504可以是通信接口、接收器或接收电路等，其中，该通信接口是统称，在具体实现中，该通信接口可以包括至少一个接口。
该通信装置500可以为用于执行图4A实施例的终端设备，还可以为用于执行图4A实施例对应终端设备的步骤的芯片。例如，当获取单元501、覆盖剩余时间确定单元502、目标小区确定单元503和重选确定单元505集成于一个处理单元时，该处理单元例如可以是处理器，接收单元504例如可以是接收器，该接收器包括射频电路。又例如，当获取单元501、覆盖剩余时间确定单元502、目标小区确定单元503和重选确定单元505集成于一个处理单元时，该处理单元例如可以是处理器，该接收单元504例如可以是输入接口、管脚或电路等。
在一个实施例中：
获取单元501，用于对目标频点进行测量，获取满足第一条件的至少两个小区；覆盖剩余时间确定单元502，用于确定所述至少两个小区的覆盖剩余时间；目标小区确定单元503，用于根据所述至少两个小区的覆盖剩余时间，确定目标小区。
在一种可能的实现方法中，所述目标小区确定单元503，具体用于确定所述至少两个小区中覆盖剩余时间最长的小区，为所述目标小区。
在一种可能的实现方法中，所述目标小区确定单元503，具体用于根据所述至少两个小区的覆盖剩余时间和覆盖时间门限，将覆盖剩余时间大于或者等于所述覆盖时间门限的小区确定为候选小区，并根据所述候选小区的小区质量，确定所述目标小区。
在一种可能的实现方法中，所述目标小区确定单元503，具体用于确定所述候选小区中小区质量最好的小区，为所述目标小区；或者，根据所述候选小区的小区质量和所述候选小区的覆盖剩余时间，确定所述候选小区中各个小区的综合值，根据各个小区的综合值，确定所述目标小区。
在一种可能的实现方法中，接收单元504，用于接收来自网络设备的重选配置信息，所述重选配置信息包括所述覆盖时间门限。
在一种可能的实现方法中，所述覆盖剩余时间确定单元502，还用于确定终端设备的服务小区的覆盖剩余时间；重选确定单元505，用于根据所述覆盖剩余时间和重选触发时间门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元505，具体用于确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元505，具体用于根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元505，具体用于确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元505，还用于确定所述重选触发质量门限大于预设的第一阈值。
在一种可能的实现方法中，所述重选确定单元505，具体用于确定所述覆盖剩余时间小于或等于所述重选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元505，还用于确定所述重选触发质量门限小于预设的第二阈值。
在一种可能的实现方法中，接收单元504，用于接收来自网络设备的所述重选触发时间门限。
图5所示的装置为终端设备时，执行小区重选的方法的具体有益效果，可参考前述图4A所示的方法实施例中的相关描述，这里不再赘述。可以理解的是，本申请实施例中的单元也可以称为模块。上述单元或者模块可以独立存在，也可以集成在一起。
图6示出了本申请实施例中所涉及的通信装置的可能的示例性框图，该通信装置600可以以软件或者硬件的形式存在。通信装置600可以包括：覆盖剩余时间确定单元601和重选确定单元602。可选的，该通信装置600还可以包括接收单元603。作为一种实现方式，覆盖剩余时间确定单元601和重选确定单元602可以单独设置，也可以集成于至少一个处理单元，该至少一个处理单元用于对通信装置600的动作进行控制管理。接收单元603用于支持通信装置600与其他网络实体的通信。可选的，通信装置600还可以包括存储单元，该存储单元可以用于存储指令和/或数据，该至少一个处理单元或者覆盖剩余时间确定单元601和重选确定单元602可以读取存储单元中的指令和/或数据，以使得通信装置600实现相应的方法。
一种可能的方式中，当覆盖剩余时间确定单元601和重选确定单元602集成于至少一个处理单元时，该处理单元可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。接收单元603可以是通信接口、接收器或接收电路等，其中，该通信接口是统称，在具体实现中，该通信接口可以包括至少一个接口。
该通信装置600可以为用于执行图4B实施例的终端设备，还可以为用于执行图4B实施例的对应终端设备的步骤芯片。例如，当覆盖剩余时间确定单元601和重选确定单元602集成于一个处理单元时，该处理单元例如可以是处理器，接收单元603例如可以是接收器， 该接收器包括射频电路。又例如，当覆盖剩余时间确定单元601和重选确定单元602集成于一个处理单元时，该处理单元例如可以是处理器，该接收单元603例如可以是输入接口、管脚或电路等。
在一个实施例中：
覆盖剩余时间确定单元601，用于确定终端设备的服务小区的覆盖剩余时间；重选确定单元602，用于根据所述覆盖剩余时间和重选触发时间门限，确定是否执行小区重选。
在一种可能的实现方法中，所述重选确定单元602，具体用于确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元602，具体用于根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定是否执行小区重选。
在一种可能的实现方法中，所述重选确定单元602，具体用于确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元602，还用于确定所述重选触发质量门限大于预设的第一阈值。
在一种可能的实现方法中，所述重选确定单元602，具体用于确定所述覆盖剩余时间小于或等于所述重选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
在一种可能的实现方法中，所述重选确定单元602，还用于确定所述重选触发质量门限小于预设的第二阈值。
在一种可能的实现方法中，接收单元603，用于接收来自网络设备的所述重选触发时间门限。
图6所示的通信装置为终端设备时，执行小区重选的方法的具体有益效果，可参考前述图4B所示的方法实施例中的相关描述，这里不再赘述。可以理解的是，本申请实施例中的单元也可以称为模块。上述单元或者模块可以独立存在，也可以集成在一起。
图7示出了本发明实施例中所涉及的终端设备的一种可能的设计结构的简化示意图。所述终端设备700包括发射器701，接收器702和处理器703。其中，处理器703也可以为控制器，图7中表示为“控制器/处理器703”。可选的，所述终端设备700还可以包括调制解调处理器705，其中，调制解调处理器705可以包括编码器706、调制器707、解码器708和解调器709。
在一个示例中，发射器701调节(例如，模拟转换、滤波、放大和上变频等)输出采样并生成上行链路信号，该上行链路信号经由天线发射给上述实施例中所述的接入网设备。在下行链路上，天线接收上述实施例中接入网设备发射的下行链路信号。接收器702调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。在调制解调处理器705中，编码器706接收要在上行链路上发送的业务数据和信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码和交织)。调制器707进一步处理(例如，符号映射和调制)编码后的业务数据和信令消息并提供输出采样。解调器709处理(例如，解调)该输入采样并提供符号估计。解码器708处理(例如，解交织和解码)该符号估计并提供 发送给终端设备700的已解码的数据和信令消息。编码器706、调制器707、解调器709和解码器708可以由合成的调制解调处理器705来实现。这些单元根据无线接入网采用的无线接入技术来进行处理。需要说明的是，当终端设备700不包括调制解调处理器705时，调制解调处理器705的上述功能也可以由处理器703完成。
处理器703对终端设备700的动作进行控制管理，用于执行上述本发明实施例中由终端设备700进行的处理过程。例如，处理器703用于执行本申请任一实施例的小区重选的方法中涉及终端设备的处理过程和/或本申请所描述的技术方案的其他过程。
进一步的，终端设备700还可以包括存储器704，存储器704用于存储用于终端设备600的程序代码和数据。
本申请实施例还提供一种通信装置，该装置可以以软件或者硬件的形式存在。该通信装置可以包括：发送单元，该发送单元用于支持通信装置与其他网络实体的通信。该发送单元可以是通信接口、发送器或发送电路等，其中，该通信接口是统称，在具体实现中，该通信接口可以包括至少一个接口。
该装置可以为用于执行上述任意实施例的网络设备，还可以为用于实现上述任意实施例对应网络设备的步骤的芯片。例如，发送单元例如可以是发送器，该发送器包括射频电路。或者，该发送单元例如可以是输出接口、管脚或电路等。
在一个实施例中：
网络设备向终端设备发送重选配置信息，所述重选配置信息包括覆盖时间门限，所述覆盖时间门限用于所述终端设备确定目标小区。
在一些可能的实现方法中，网络设备还可以向终端设备发送重选触发时间门限，所述重选触发时间门限用于所述终端设备确定是否执行小区重选。
在又一个实施例中：
网络设备向终端设备发送重选触发时间门限，所述重选触发时间门限用于所述终端设备确定是否执行小区重选。
可选的，该装置还可以包括处理单元，用于生成或者确定覆盖时间门限和/或重选触发时间门限。
可选的，该装置还可以包括存储单元，该存储单元可以用于存储指令和/或数据，该处理单元可以读取存储单元中的指令和/或数据，以使得通信装置实现相应的方法。
上述通信装置执行小区重选的方法的具体有益效果，可参考前述方法实施例中的相关描述，这里不再赘述。可以理解的是，本申请实施例中的单元也可以称为模块。上述单元或者模块可以独立存在，也可以集成在一起。
本申请实施例还提供一种通信系统，该通信系统包括上述任意方法实施例中的终端设备和该实施例中的网络设备。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算 机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
本申请实施例中所描述的各种说明性的逻辑单元和电路可以通过通用处理器，数字信号处理器，专用集成电路(ASIC)，现场可编程门阵列(FPGA)或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合的设计来实现或操作所描述的功能。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类似的配置来实现。
本申请实施例中所描述的方法或算法的步骤可以直接嵌入硬件、处理器执行的软件单元、或者这两者的结合。软件单元可以存储于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可移动磁盘、CD-ROM或本领域中其它任意形式的存储媒介中。示例性地，存储媒介可以与处理器连接，以使得处理器可以从存储媒介中读取信息，并可以向存储媒介存写信息。可选地，存储媒介还可以集成到处理器中。处理器和存储媒介可以设置于ASIC中，ASIC可以设置于终端中。可选地，处理器和存储媒介也可以设置于终端中的不同的部件中。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包括这些改动和变型在内。

Claims (29)

  1. 一种小区重选的方法，其特征在于，包括：
    对目标频点进行测量，获取满足第一条件的至少两个小区；
    确定所述至少两个小区的覆盖剩余时间；
    根据所述至少两个小区的覆盖剩余时间，确定目标小区。
  2. 如权利要求1所述的方法，其特征在于，根据所述至少两个小区的覆盖剩余时间，确定目标小区，包括：
    确定所述至少两个小区中覆盖剩余时间最长的小区，为所述目标小区。
  3. 如权利要求1所述的方法，其特征在于，根据所述至少两个小区的覆盖剩余时间，确定目标小区，包括：
    根据所述至少两个小区的覆盖剩余时间和覆盖时间门限，将覆盖剩余时间大于或者等于所述覆盖时间门限的小区确定为候选小区；
    根据所述候选小区的小区质量，确定所述目标小区。
  4. 如权利要求3所述的方法，其特征在于，根据所述候选小区的小区质量，确定所述目标小区，包括：
    确定所述候选小区中小区质量最好的小区，为所述目标小区；或者，
    根据所述候选小区的小区质量和所述候选小区的覆盖剩余时间，确定所述候选小区中各个小区的综合值，根据各个小区的综合值，确定所述目标小区。
  5. 如权利要求3或4所述的方法，其特征在于，还包括：
    接收来自网络设备的重选配置信息，所述重选配置信息包括所述覆盖时间门限。
  6. 如权利要求1-5任一所述的方法，其特征在于，对目标频点进行测量，获取满足第一条件的至少两个小区之前，还包括：
    确定终端设备的服务小区的覆盖剩余时间；
    根据所述覆盖剩余时间和重选触发时间门限，确定执行小区重选。
  7. 如权利要求6所述的方法，其特征在于，根据所述覆盖剩余时间和重选触发时间门限，确定执行小区重选，包括：
    确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
  8. 如权利要求6所述的方法，其特征在于，根据所述覆盖剩余时间和重选触发时间门限，确定执行小区重选，包括：
    根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定执行小区重选。
  9. 如权利要求8所述的方法，其特征在于，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定执行小区重选，包括：
    确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
  10. 如权利要求9所述的方法，其特征在于，还包括：
    确定所述重选触发质量门限大于第一阈值。
  11. 如权利要求8所述的方法，其特征在于，根据所述覆盖剩余时间、所述重选触发 时间门限、所述服务小区的小区质量和重选触发质量门限，确定执行小区重选，包括：
    确定所述覆盖剩余时间小于或等于所述重选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
  12. 如权利要求11所述的方法，其特征在于，还包括：
    确定所述重选触发质量门限小于第二阈值。
  13. 如权利要求6-12任一所述的方法，其特征在于，还包括：
    接收来自网络设备的所述重选触发时间门限。
  14. 一种小区重选的方法，其特征在于，包括：
    确定终端设备的服务小区的覆盖剩余时间；
    根据所述覆盖剩余时间和重选触发时间门限，确定是否执行小区重选。
  15. 如权利要求14所述的方法，其特征在于，根据所述覆盖剩余时间和重选触发时间门限，确定是否执行小区重选，包括：
    确定所述服务小区的覆盖剩余时间小于或等于所述重选触发时间门限，确定执行小区重选。
  16. 如权利要求14所述的方法，其特征在于，根据所述覆盖剩余时间和重选触发时间门限，确定是否执行小区重选，包括：
    根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定是否执行小区重选。
  17. 如权利要求16所述的方法，其特征在于，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定是否执行小区重选，包括：
    确定所述覆盖剩余时间小于或等于所述重选触发时间门限、且确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
  18. 如权利要求17所述的方法，其特征在于，还包括：
    确定所述重选触发质量门限大于第一阈值。
  19. 如权利要求16所述的方法，其特征在于，根据所述覆盖剩余时间、所述重选触发时间门限、所述服务小区的小区质量和重选触发质量门限，确定是否执行小区重选，包括：
    确定所述覆盖剩余时间小于或等于所述选触发时间门限、或确定所述服务小区的小区质量小于或等于所述重选触发质量门限，确定执行小区重选。
  20. 如权利要求19所述的方法，其特征在于，还包括：
    确定所述重选触发质量门限小于第二阈值。
  21. 如权利要求14-20任一所述的方法，其特征在于，还包括：
    接收来自网络设备的所述重选触发时间门限。
  22. 一种通信装置，其特征在于，用于实现如权利要求1-13所述的方法。
  23. 一种通信装置，其特征在于，用于实现如权利要求14-21所述的方法。
  24. 一种小区重选的系统，其特征在于，包括终端设备和网络设备；
    所述网络设备，用于向所述终端设备发送重选配置信息，所述重选配置信息包括覆盖时间门限；
    所述终端设备，用于对目标频点进行测量，获取满足第一条件的至少两个小区；确定 所述至少两个小区的覆盖剩余时间；根据所述至少两个小区的覆盖剩余时间和所述覆盖时间门限，确定目标小区。
  25. 一种小区重选的系统，其特征在于，包括终端设备和网络设备；
    所述网络设备，用于向所述终端设备发送重选触发时间门限；
    所述终端设备，用于确定所述终端设备的服务小区的覆盖剩余时间；根据所述覆盖剩余时间和所述重选触发时间门限，确定是否执行小区重选。
  26. 一种通信装置，其特征在于，包括：处理器，用于调用存储器中的程序，以执行权利要求1-13任一所述的方法。
  27. 一种通信装置，其特征在于，包括：处理器，用于调用存储器中的程序，以执行权利要求14-21任一所述的方法。
  28. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储程序，所述程序被处理器调用时，权利要求1-21任一所述的方法被执行。
  29. 一种计算机程序，其特征在于，当所述程序被处理器调用时，权利要求1-21任一所述的方法被执行。
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