WO2022206557A1

WO2022206557A1 - Communication method and apparatus

Info

Publication number: WO2022206557A1
Application number: PCT/CN2022/082815
Authority: WO
Inventors: 吴烨丹; 耿婷婷; 唐珣
Original assignee: 华为技术有限公司
Priority date: 2021-03-29
Filing date: 2022-03-24
Publication date: 2022-10-06
Also published as: CN115134747A

Abstract

The present application provides a communication method and apparatus, for use in solving the problem that in a non-terrestrial network (NTN) communication system, a terminal device has a longer communication delay and wastes more power since the time required for the terminal device to perform radio link failure (RLF) determination increases sharply. The method comprises: a terminal device obtains a remaining coverage duration of a serving cell covering a first geographic area, the terminal device being located in the first geographic area; and when the remaining coverage duration is less than a first time threshold, the terminal device determines that an RLF occurs. In embodiments of the present application, the terminal device determines, by means of the remaining coverage duration of the serving cell, whether the RLF occurs, so that radio resource control (RRC) re-establishment can be triggered in time when a coverage signal is weak or disappears, thereby improving the communication quality of the terminal device and reducing communication delay.

Description

A communication method and device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed on March 29, 2021 with the application number 202110334700.4 and the application title is "a communication method and device", the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the field of communication technologies, and in particular, to a communication method and device.

Background technique

Currently, in a mobile communication system, after a user terminal (user equipment, UE) establishes a radio resource control (RRC) connection with a network device and enters the RRC connection state, if a radio link failure (RLF) occurs ), handover failure, etc., the RRC re-establishment process will be triggered.

Currently, the conditions for triggering RLF are radio link control (radio link control, RLC) uplink maximum retransmission or random access problems (for example, out-of-sync resynchronization) or T310 timeout (that is, out-of-sync detection). The maximum number of RLC uplink retransmissions is the maximum number of times that the RLC protocol layer performs retransmissions to the lower-layer protocol layer when the UE sends uplink data. Out-of-synchronization resynchronization is the maximum number of preamble (preamble) transmissions caused by out-of-synchronization of the uplink timing advance (TA). T310 is a timer triggered after the upper protocol layer of the UE continuously receives N310 out-of-sync indications from the lower layer.

Because the non-terrestrial network (NTN) communication has the characteristics of wide coverage and large delay, the round trip time (RTT) of the communication between the UE and the network device is also relatively long, which causes the UE to perform RLF determination. The required time increases sharply, which causes a large UE communication delay and wastes power.

SUMMARY OF THE INVENTION

The present application provides a communication method and device to solve the problem of a sharp increase in the time required for a UE to perform RLF determination in an NTN communication system, resulting in a longer communication delay and a waste of power for the UE.

In a first aspect, an embodiment of the present application provides a communication method, including: a terminal device obtains a remaining coverage duration of a serving cell covering a first geographic area, the terminal device is located in the first geographic area; A radio link failure is determined to occur when the threshold is exceeded. In the embodiment of the present application, the terminal device determines whether RLF occurs by the remaining coverage time of the serving cell, so that RRC re-establishment can be triggered in time when the coverage signal is weak or disappears, thereby improving the communication quality of the terminal device and reducing the communication delay.

In a possible design, the terminal device may receive the coverage time information of the serving cell from the network device, and determine the remaining coverage time length according to the coverage time information. In the above manner, the terminal device can determine the remaining coverage duration of the serving cell, so as to determine whether RLF occurs according to the remaining coverage duration.

In a possible design, the coverage time information may be the remaining coverage time, or the coverage time information may also be the remaining coverage time period of the serving cell covering the first geographic area, or the coverage time information may also be the coverage of the serving cell period. In the above design, the network device may directly indicate the remaining coverage duration, or may indicate the coverage time period, so that the terminal device can determine the remaining coverage duration according to the current time.

In a possible design, the terminal device may determine the remaining coverage duration according to the ephemeris information and the first geographical area. Through the above design, the terminal device can determine the remaining coverage duration of the serving cell by itself.

In a possible design, after the terminal device determines that the radio link failure occurs when the remaining coverage duration is less than the first time threshold, the terminal device may further determine the radio resource control RRC state after the radio link failure occurs according to the cell coverage information , the cell coverage information includes, but is not limited to, at least one of the following information: the remaining coverage duration of the serving cell, the remaining coverage duration of N neighboring cells, and the waiting duration of M neighboring cells, where the waiting duration is the time when the terminal equipment enters the neighboring cell. The length of time to wait in the coverage area. Both M and N are integers greater than 0. Through the above design, the terminal device can select an appropriate RRC state, for example, when the remaining coverage time of the serving cell is short and the waiting time of the neighbor cell is long, the RRC idle state can be used, thereby reducing signaling overhead and power consumption.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage time of the serving cell is greater than the second time threshold, the terminal device performs RRC reconstruction in the serving cell. Through the above design, the communication quality of the terminal device can be improved.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage duration of the serving cell is not greater than the second time threshold, the terminal device performs cell selection. Through the above design, the terminal device can timely select an appropriate cell for RRC re-establishment, thereby reducing the communication delay.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage duration of the first neighboring cell in the N neighboring cells is greater than the third time threshold, the terminal device The RRC reconstruction is performed in the first neighboring cell, where the first neighboring cell is any one of the N neighboring cells. Through the above design, the communication continuity of the terminal device can be improved.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the first time difference is greater than the fourth time threshold, the terminal device performs RRC reconstruction in the second neighboring cell, the first The time difference is the result of subtracting the remaining coverage duration of the serving cell from the remaining coverage duration of the second neighboring cell, where the second neighboring cell is any neighboring cell among the N neighboring cells. Through the above design, the terminal device can select a neighbor cell with a longer remaining coverage time to perform RRC reconstruction, thereby improving signal continuity.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: the remaining coverage duration of the serving cell is less than the fifth threshold, and the remaining coverage duration of the third neighboring cell is greater than the sixth When the threshold is set, the terminal device performs RRC reconstruction in the third neighboring cell, which is the cell with the longest remaining coverage time among the N neighboring cells. Through the above design, the terminal device can select a neighbor cell with a longer remaining coverage time to perform RRC reconstruction, thereby improving signal continuity.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage durations of the serving cell and N neighboring cells are both less than the seventh threshold, the terminal device is in the fourth The neighbor cell performs RRC reconstruction, and the fourth neighbor cell is the cell with the shortest waiting time among the M neighbor cells. Through the above design, communication interruption can be reduced.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage durations of the serving cell and N neighboring cells are both less than the seventh threshold, the terminal device is in the fifth The neighbor cell performs RRC reconstruction, and the fifth neighbor cell is a cell whose waiting time is not greater than the eighth threshold and has the longest coverage time in the first geographical area among the M neighbor cells. Through the above design, the communication interruption can be reduced, and the continuity of the signal can be ensured as much as possible.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: when the remaining coverage durations of the serving cell and N neighboring cells are both less than the seventh threshold, the terminal device is in the sixth The neighbor cell performs RRC reconstruction, and the sixth neighbor cell is the cell with the highest metric value among the M neighbor cells, and the metric value is determined according to the waiting time of the neighbor cell and the coverage time covering the first geographic area. Through the above design, the communication interruption can be reduced, and the continuity of the signal can be ensured as much as possible.

In a possible design, the terminal device determines the RRC state after the radio link failure occurs according to the cell coverage information, including: the remaining coverage durations of the serving cell and N neighboring cells are both less than the seventh threshold, and the M neighboring cells have When the waiting time is greater than the eighth threshold, the terminal device enters the RRC idle state. Through the above design, the terminal device can save resources such as signaling overhead and power.

In a possible design, the terminal device sends an RRC re-establishment report, and the RRC re-establishment report carries the RRC re-establishment reason, and the RRC re-establishment reason is related to the coverage time of the serving cell. Through the above design, the network device can determine the reason for the RRC re-establishment of the terminal device.

In a second aspect, an embodiment of the present application provides a communication method, including: a terminal device determines N suitable cells, the suitable cells satisfy a coverage condition, and the coverage condition is that the remaining coverage duration covering the first geographical area is greater than a first time threshold or waiting for The duration is less than the second time threshold, where the terminal device is located in the first geographical area, the waiting duration is the duration that the terminal device needs to wait for entering the coverage of the cell, and N is an integer greater than 0; selection or cell reselection.

In the embodiment of the present application, by considering the coverage duration or waiting time of the cell when selecting a suitable cell, the terminal device can select a cell with a longer coverage time or a cell with a shorter waiting time for camping, thereby improving the stability of communication. , improve the communication quality.

In a possible design, the terminal device determines N suitable cells, including: the terminal device selects N cells whose remaining coverage duration is greater than the first time threshold as suitable cells; or, the remaining coverage duration of the cells covering the first geographical area When all are less than the first time threshold, the terminal device selects N cells whose waiting time is less than the second time threshold as suitable cells. Through the above design, the terminal device can preferentially select a serving cell covering the first geographic area and a cell whose remaining coverage duration satisfies the condition as a suitable cell.

In a possible design, the terminal device performs cell selection or cell reselection in N suitable cells, including: the terminal device performs cell selection or cell reselection in N suitable cells based on the S criterion or the R criterion, wherein, The remaining coverage duration or waiting duration is the offset value in the S criterion or the R criterion. In the above design, by introducing the remaining coverage duration parameter or the waiting duration parameter into the S criterion or the R criterion, a cell with a longer remaining coverage duration or a shorter waiting duration can be preferentially selected.

In a third aspect, the present application provides a communication apparatus, which may be a terminal device, or a chip or a chipset in the terminal device. The apparatus may include a processing unit and a storage unit.

When the apparatus is a terminal device, the processing unit may be a processor, and the storage unit may be a memory. The apparatus may further include a transceiver unit, and the transceiver unit is configured to communicate with the network device. The transceiver unit may be a transceiver. The storage unit is used for storing instructions, and the processing unit executes the instructions stored in the storage unit, so that the terminal device performs the corresponding function of the first aspect or the second aspect.

When the device is a chip or a chipset in a terminal device, the processing unit may be a processor, and the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip or the chipset, or a storage unit located in the A storage unit (eg, read only memory, random access memory, etc.) external to a chip or chipset. The apparatus may further include a transceiver unit, and the transceiver unit is configured to communicate with the network device. The transceiver unit can be an input/output interface, a pin or a circuit, etc. The storage unit is used for storing instructions, and the processing unit executes the instructions stored in the storage unit, so that the terminal device performs the corresponding function in the first aspect or the second aspect.

In a fourth aspect, an embodiment of the present application provides a communication apparatus, the apparatus includes a communication interface and a processor, and the communication interface is used for the apparatus to communicate with other devices, such as data or signal transmission and reception. Illustratively, the communication interface may be a transceiver, circuit, bus, module or other type of interface, and the other device may be a network device. The processor is configured to invoke a set of programs, instructions or data to execute the method described in the first aspect or each possible design of the first aspect, or execute the method described in the second aspect or each possible design of the second aspect. The apparatus may also include a memory for storing programs, instructions or data invoked by the processor. The memory is coupled to the processor, and when the processor executes the instructions or data stored in the memory, the processor can implement the method described in the first aspect or each possible design of the first aspect, or execute the second aspect. Aspect or the method described in each possible design of the second aspect.

In a fifth aspect, the embodiments of the present application further provide a computer-readable storage medium, where computer-readable instructions are stored in the computer-readable storage medium, and when the computer-readable instructions are executed on a computer, the computer-readable instructions can be The methods described in any one of the one aspect to the second aspect and each possible design are performed.

In a sixth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor, and may also include a memory, for implementing any one of the above-mentioned first to second aspects and the various possible designs. Methods. The chip system can be composed of chips, and can also include chips and other discrete devices.

In a seventh aspect, embodiments of the present application provide a computer program product containing instructions, which, when executed on a computer, cause the methods described in the first aspect or the second aspect and various possible designs to be performed.

In an eighth aspect, an embodiment of the present application provides a communication device, the communication device includes a processor, a memory, and a transceiver, where the transceiver is used to receive a signal or send a signal; the memory is used to store a program code or a transceiver. Instructions; the processor for invoking the program code or instructions from the memory to execute the method according to the first aspect or the second aspect.

In a ninth aspect, an embodiment of the present application provides a communication device, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive computer program codes or instructions and transmit them to the processor; the processor The computer program code or instructions are run to perform the corresponding method as described in the first or second aspect above.

In a tenth aspect, an embodiment of the present application provides a communication device. Exemplarily, the communication device may be a chip, and the communication device includes: a logic circuit and an input and output interface. The input and output interface is used for the device to communicate with network equipment, such as receiving coverage time information. The logic circuit is adapted to run computer program code or instructions to perform the corresponding method as described in the first aspect or the second aspect above.

Wherein, for the technical effects brought by any one of the implementation manners of the third aspect to the tenth aspect, reference may be made to the beneficial effects in the corresponding methods provided above, which will not be repeated here.

Description of drawings

FIG. 1 is a schematic diagram of an RRC state transition provided by an embodiment of the present application;

2 is a schematic diagram of a satellite provided in an embodiment of the present application;

3 is a schematic diagram of another satellite provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a network device according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an NTN application scenario provided by an embodiment of the present application;

6 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application;

7 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of an interface provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application;

10 is a schematic diagram of another NTN application scenario provided by an embodiment of the present application;

11 is a schematic flowchart of a communication method provided by an embodiment of the present application;

Fig. 12 is a kind of RLF time comparison schematic diagram provided by the embodiment of this application;

13 is a schematic flowchart of a cell reselection provided by an embodiment of the present application;

14 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 16 is a schematic structural diagram of another communication apparatus provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

Hereinafter, some terms in the present application will be explained so as to facilitate the understanding of those skilled in the art.

1. Radio resource control (RRC) status of terminal equipment

In the new radio (NR), the RRC state of the terminal device includes a connected state (RRC_CONNECTED), a deactivated state or a third state (RRC_INACTIVE), and an idle state (RRC_IDLE). When the terminal device is in the RRC_CONNECTED state, the terminal device Links have been established with the network equipment and the core network. When data arrives at the network, it can be directly transmitted to the terminal equipment; when the terminal equipment is in the RRC_INACTIVE state, it means that the terminal equipment has established links with the network equipment and the core network before, but the terminal equipment The link from the device to the network device is released. Although the link is released, the network device will store the context of the terminal device. When there is data to be transmitted, the network device can restore the link in time; when the terminal device is in In the RRC_IDLE state, there is no link between the terminal device and the network device and the network. When there is data to be transmitted, a link from the terminal device to the network device and the core network needs to be established. The transitions of the three states are shown in Figure 1.

2. Community selection

When the terminal device is powered 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 evaluates whether the cell is a suitable cell according to the conditions of the suitable cell, if the cell is a suitable cell, the cell selection process is completed, otherwise, it searches for a suitable cell.

Suitable communities usually meet the following conditions:

1) The public land mobile network (PLMN) identification (PLMN ID) of the cell belongs to the selected PLMN (selected PLMN), registered PLMN (registered PLMN, RPLMN) or equivalent PLMN (equivalent PLMN, EPLMN) one of the.

2) The cell satisfies the S criterion.

Wherein, the S criterion formula is: if the S value of the cell is greater than 0, it indicates that the cell is a suitable cell, wherein the S value of the cell can be the Srxlev of the cell or the Squal of the cell;

Srxlev=Q _rxlevmeas –(Q _rxlevmin +Q _{rxlevminoffset} )–P _compensation -Qoffset _temp

Squal=Q _qualmeas -(Q _qualmin +Q _{qualminoffset} )-Qoffset _temp ;

in:

Srxlev refers to the level value (dB) calculated during the cell selection/reselection process;

Q _rxlevmeas refers to the received signal strength value measured by the terminal equipment, which is the measured reference signal received power (RSRP) (dBm);

Q _rxlevmin refers to the minimum received signal strength value required by the cell, which can be indicated by system information block 1 (SIB1);

P _compensation is max(PEMAX–PUMAX, 0)(dB), where PEMAX is the maximum allowable transmit power set by the system when the terminal equipment accesses the cell; PUMAX refers to the maximum output power specified according to the level of the terminal equipment.

Q _{rxlevminOffset} is valid only when it normally resides in a VPLMN and periodically searches for a high-priority PLMN for cell selection evaluation. This parameter biases Qrxlevmin to a certain extent.

Squal is the received signal quality value calculated during the cell selection/reselection process;

Q _qualmeas refers to the reference signal received quality (reference signal received quality, RSRQ) of the downlink measurement of the cell;

Q _qualmin refers to the minimum required RSRQ of the cell;

Q _{qualminOffset} is valid only when it normally resides in a VPLMN and periodically searches for a high-priority PLMN for cell selection evaluation. This parameter biases Qqualmin to a certain extent.

Qoffset _temp is the offset value.

Srxlev and Squal can refer to the relevant descriptions in Section 5.2.3.2 of TS38.304 of the 3GPP protocol, and will not be described here.

3) The cell is not prohibited from accessing the terminal equipment.

4) On the premise that the PLMN ID of the cell satisfies the condition 1), at least one tracking area (TA) is not in the prohibited TA.

3. Cell reselection

Cell reselection refers to a process in which a terminal device selects a best cell to provide a serving signal by monitoring the signal quality of neighboring cells and the current serving cell in idle mode. Re-selection criteria between inter-frequency and inter-systems with different priorities.

If the cell priority of the inter-radio access technology (inter-RAT) neighboring cell is higher than the cell priority of the current serving cell, if the current serving cell carries threshServingLowQ in the system information (SIB2), where threshServingLowQ It is the reselection threshold value corresponding to the neighboring cell whose cell priority is smaller than the current serving cell. Then the reselection is triggered when the following conditions are met: the terminal equipment resides in the current serving cell for more than a preset duration (eg 1 second); within the time interval (T _{reselectionRAT} ), the neighboring cell satisfies Squal>Thresh _X,HighQ . If the current serving cell does not carry threshServingLowQ in the system information (SIB2), the reselection is triggered when the following conditions are met: within the time interval (T _{reselectionRAT} ) the neighbor cell satisfies Srxlev>Thresh _X,HighP ; the terminal equipment is in the current serving cell has stayed longer than a preset duration (eg 1 second).

If the cell priority of a neighboring cell in inter-frequency/inter-RAT (inter radio access technology, inter-RAT) is equal to the cell priority of the current serving cell, the terminal device can perform cell reselection according to the R criterion. The R criterion is to calculate an R (Rank) value for each neighboring cell and the current serving cell according to the signal quality of the cell, and then sort according to the size of the R value. If the R value is greater than the current serving cell, the reselection criteria are met. , choose the best one. Within the time interval (Treselection _RAT ), the neighbor cell always satisfies the R criterion, and the terminal equipment camps on the current serving cell for more than a preset time period (for example, 1 second). Then the terminal device initiates reselection to the adjacent cell. The R value R _s of the serving cell may conform to the following formula, or the R value R _s of the serving cell may be determined by the following formula:

R _s =Q _meas,s +Q _hyst -Qoffset _temp ;

Wherein, Q _meas,s is the signal quality of the current serving cell, which can be obtained by measuring the terminal equipment.

Q _hyst is the reselection hysteresis value of the current serving cell. The larger the value of Q _hyst , the larger the boundary of the serving cell, and the lower the probability of reselection to the neighboring cell.

Qoffset is the R criterion calculation parameter. In the case of intra-frequency reselection, Qoffset can be equal to Qoffsetcell, and Qoffsetcell can be obtained from SIB3; in the case of inter-frequency reselection, Qoffset can be equal to the sum of QoffsetCell and QoffsetFreq, and QoffsetCell and QoffsetFreq can be obtained from SIB4.

Qoffset _temp is the R criterion calculation parameter, which can be obtained from SIB1.

The R value R _n of the neighboring cell can conform to the following formula, or the R value R _n of the neighboring cell can be determined by the following formula:

R _n =Q _meas,n −Qoffset−Qoffset _temp ;

Among them, Q _meas,n is the signal quality of the adjacent cell, which can be obtained by measuring the terminal equipment.

For the R value R _s of the serving cell and the R value R _n of the neighboring cell, reference may be made to the relevant descriptions in TS38.304 of the 3GPP protocol, which will not be described here.

If the cell priority of the neighboring cell in inter-radio access technology (inter-RAT) is lower than the cell priority of the current serving cell, and if the current serving cell carries threshServingLowQ in the system information (SIB2), the The reselection is triggered when the following conditions are met: the neighboring cells whose cell priority is higher than the current serving cell do not meet the corresponding reselection criteria; the neighboring cells whose cell priority is equal to the current serving cell do not meet the corresponding reselection criteria; the serving cell satisfies Squal<Thresh _{Serving, LowQ} ; the neighbor cell satisfies Squal>Thresh _{X, LowQ} during the time interval (Treselection _RAT ); the terminal equipment camps on the current serving cell for more than a preset time period (for example, 1 second). If the current serving cell does not carry threshServingLowQ in the system information (SIB2), the reselection is triggered when the following conditions are met: the neighboring cells whose cell priority is higher than the current serving cell do not meet the corresponding reselection criteria; the cell priority is equal to the current serving cell The neighboring cell of the cell does not meet the corresponding reselection criteria; the serving cell satisfies Squal<Thresh _{Serving, LowP} ; the neighboring cell satisfies Squal>Thresh _{X, LowP} during the time interval (Treselection _RAT ); the terminal equipment resides in the current serving cell for more than for a preset duration (eg 1 second).

4. Non-terrestrial network (NTN) communication

NTN communication may also be referred to as satellite communication. The architecture of satellite communication is divided into two categories, one is the transparent forwarding (transparent) architecture, at this time the satellite only acts as a relay or amplifier, and can do radio frequency filtering, amplification, etc., to regenerate the signal; the second is regenerative (regenerative) architecture. ) architecture, at this time the satellite can be a new generation of node B (generated node B, gNB), distributed unit (distributed unit, DU), relay, the relay here is different from the relay in the first category, and it is no longer a simple relay, which also has a signal processing function, is similar to an integrated access and backhaul (IAB) node or other relay nodes. Among them, when the satellite is used as a gNB, DU, IAB or other relay node, its function is similar to the ordinary gNB, DU, IAB or other relay nodes.

NTN communication provides seamless coverage for terminal equipment by deploying the functions of access network equipment or part of the access network equipment on non-terrestrial equipment (such as high-altitude platforms or satellites, etc.), because non-terrestrial equipment is less affected by natural disasters , which can improve the reliability of the communication system. In order to facilitate the description and understanding of the solutions of the embodiments of the present application, the present application will take the NTN communication system in which the access network equipment is deployed on the satellite as an example for description later in the present application. Moreover, for the convenience of description, this application will hereinafter replace the description of "access network equipment on a satellite" with "satellite", and replace the description of "NTN communication" with "satellite communication". 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 access network device on the satellite. Here is a unified description, which will not be repeated later.

According to the satellite altitude, that is, the satellite orbital height, the satellite system can be divided into highly elliptical orbit (HEO) satellites, geostationary earth orbit (GEO) satellites, medium earth orbit (MEO) satellites and Low-earth orbit (LEO) satellites, as shown in Figure 2 or Figure 3. In addition, the NTN system may also include aerial network equipment such as a high altitude platform station (HAPS) communication system, and the network equipment involved in the present invention is not limited to the above examples.

It should be noted that, with the continuous development of technology, the terms in the embodiments of the present application may change, but all are within the protection scope of the present application.

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The network elements involved in the embodiments of this application include network equipment and terminal equipment.

The network device may be an access network device. An access network device is an entity on the network side for transmitting or receiving signals, such as a new generation base station (generation Node B, gNodeB). An access network device may be a device used to communicate with a mobile device. The access network device may be an access point (AP) in a wireless local area network (wireless local area networks, WLAN), or an evolved base station (evolutional Node B, eNB) in long term evolution (long term evolution, LTE). or eNodeB), or relay station or access point or integrated access and backhaul (IAB), or in-vehicle equipment, wearable equipment and access network equipment in 5G network or future evolution of public land mobile network Access network equipment in the (public land mobile network, PLMN) network, or gNB in the NR system. In addition, in this embodiment of the present application, an access network device provides services for a cell, and a terminal device communicates with the access network device through transmission resources (eg, frequency domain resources, or spectrum resources) used by the cell.

The access network device in this embodiment of the present application may refer to a central unit (central unit, CU) or a DU. Alternatively, the access network device may also be composed of CU and DU, for example, as shown in FIG. 4 . The CU and the DU may be physically separated, or may be deployed together, which is not specifically limited in this embodiment of the present application. One CU can be connected to one DU, or multiple DUs can share one CU, which can save costs and facilitate network expansion.

The terminal device may be a wireless terminal device capable of receiving access network device scheduling and indication information. The wireless terminal device may be a device that provides voice and/or data connectivity to users, or a handheld device with wireless connection function, or a Other processing equipment for wireless modems. A wireless end device may communicate with one or more core networks or the Internet via a radio access network (eg, radio access network, RAN), and the wireless end device may be a mobile end device, such as a mobile phone (or "cellular" phone) , mobile phone (mobile phone), computer and data card, for example, may be portable, pocket, hand-held, computer built-in or vehicle mounted mobile devices that exchange language and/or data with the radio access network. For example, personal communications service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), tablets Computer (Pad), computer with wireless transceiver function and other equipment. Wireless terminal equipment may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point ( access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (customer premises equipment, CPE), terminal (terminal), user equipment (user equipment, UE), mobile terminal (mobile terminal, MT), etc. The wireless terminal device can also be a wearable device and a next-generation communication system, for example, a terminal device in a 5G network or a terminal device in a future evolved PLMN network, a terminal device in an NR communication system, and the like.

In addition, the embodiments of the present application may also be applicable to other future-oriented communication technologies. The network architecture and service scenarios described in this application are for the purpose of illustrating the technical solutions of this application more clearly, and do not constitute a limitation on the technical solutions provided by this application. appears, the technical solutions provided in this application are also applicable to similar technical problems.

It should be noted that the embodiments of the present application do not limit the types and formats of the above communication systems. For example, the communication system may be: a fifth generation (The 5th Generation, 5G) communication system, an LTE communication system, a 6G communication system, and the like.

The embodiments of the present application can be applied to the fourth generation (4G) system, 5G system, NTN system, vehicle to everything (V2X), long-term evolution-vehicle (LTE-vehicle, LTE) system -V), Vehicle to Vehicle (V2V), Internet of Vehicles, Machine Type Communications (MTC), Internet of Things (IoT), Long Term Evolution-Machine to Machine (LTE-machine to) machine, LTE-M), machine to machine (M2M), Internet of Things, or future mobile communication systems.

Exemplarily, in the application scenario shown in FIG. 5 , the satellite may act as a base station to establish an N2 or Ng connection with the AMF entity in the core network to provide wireless access services for terminal equipment.

Exemplarily, in a communication system, an X2 or Xn connection may be established between two base stations in the RAN to transmit data such as cell information, thereby realizing cell reselection and handover of the terminal device. For example, two base stations that establish a connection in a RAN can be: a satellite as a base station and a satellite as a base station, a satellite as a base station and a traditional base station, a base station composed of multiple parts and a traditional base station, or a combination of multiple parts. The functional composition of the base station and the satellite as the base station, etc. In the application scenario shown in FIG. 6, a connection can be established between two satellites serving as base stations for data and signaling interaction.

Exemplarily, in a communication system supporting carrier aggregation, dual-connectivity (DC) technology can be used to provide users with higher rates and improve spectral efficiency. Terminal equipment can connect to two base stations at the same time to increase the throughput of a single user. A connection needs to be established between two base stations to which the terminal device is connected at the same time through a corresponding interface to perform data and signaling interaction, as shown in FIG. 7 . It should be noted that one of the two base stations connected to the terminal device at the same time serves as the primary base station, and the other serves as the secondary base station. When the core network connected by the base station is different and the types of the two base stations are different, the interface between the AMF entity and the base station and the interface between the two base stations will also change accordingly, as shown in the schematic diagram of each interface in FIG. 8 .

Exemplarily, in the application scenario shown in FIG. 9 , the satellite can also be used as a relay device between the terminal device and the base station or as a remote radio unit (remote radio unit, RRU) of the base station. In this scenario, the satellite is mainly responsible for L1 relay, which is used for physical layer forwarding, and the upper layers are not visible.

Exemplarily, in the application scenario shown in FIG. 10 , the base station in the RAN is split into two functional parts, DU and CU, in which satellites can be used as DUs. In this application scenario, the interface between the DU and the CU is the F1 interface.

It should also be noted that the application scenarios shown in FIG. 5 to FIG. 10 above are only examples of application scenarios applicable to the present application, and satellites are used as an example in the above examples.

At present, the condition for triggering RLF is the maximum retransmission of the radio link control (radio link control, RLC) uplink, or a random access problem (out-of-sync resynchronization) or T310 timeout (that is, out-of-sync detection).

The maximum number of RLC uplink retransmissions is the maximum number of times that the RLC protocol layer performs retransmissions to the lower-layer protocol layer when the UE sends uplink data.

Out-of-synchronization resynchronization is the maximum number of preamble (preamble) transmissions caused by out-of-synchronization of the uplink timing advance (TA). If the terminal device does not receive the TA command in the TA, it will lead to loss of synchronization. At this time, if there is uplink data, it will trigger resynchronization, that is, the random access process. If the preamble (preamble) is sent for the maximum number of times, the terminal device determines that RLF occurs. .

T310 is a timer triggered after the upper protocol layer of the UE continuously receives N310 out-of-sync indications from the lower layer. N310 can be configured by the network, for example, when it is configured as 6, when the upper-layer protocol layer receives six consecutive out-of-synchronization indications from the physical layer, T310 is turned on. After T310 times out, it is determined that RLF occurs. The relevant description of T310 can refer to Table 1.

Table 1

Because the non-terrestrial network (NTN) communication has the characteristics of wide coverage and large delay, the round trip time (RTT) of the communication between the UE and the network device is also relatively long. When the NTN device cannot provide communication services for the terminal device, the terminal device can determine the RLF only when any of the above RLF determination conditions are satisfied. Since the RTT of the communication between the UE and the NTN device is relatively long, the time required for the UE to perform the RLF determination is dramatic. increase, so that the UE communication delay is large, and the power is wasted. To satisfy the maximum retransmission of RLC as an example, it is assumed that the maximum number of RLC retransmissions is T times, and the RTT is t1 in the terrestrial communication system, so the time it takes for the terminal equipment to determine the RLF is T×t1, while in the NTN communication system RTT is t2, so the time it takes for the terminal device to determine RLF is T×t2. Since t2 is much longer than t1, the time required for the terminal device to determine RLF is longer. For example, in a GEO scenario, the RTT is more than 500 milliseconds, while in an ordinary terrestrial communication scenario, the RTT is only about 5 milliseconds.

In addition, due to the fast flying speed of LEO satellites, the terminal equipment may have no signal coverage intermittently, especially in the early stage, the coverage is not perfect. Since the RTT of the communication between the UE and the NTN device is relatively long, the terminal device may not satisfy the RLF determination condition during the period of no signal coverage. For example, to meet the maximum RLC retransmission as an example, the terminal equipment has no signal coverage in the T1 duration. Since the RTT is relatively short in the terrestrial communication system, the number of RLC retransmissions within the T1 duration reaches the maximum value, and the terminal equipment can trigger the RRC in time. However, in the NTN communication system, the RTT is relatively long, and the number of RLC retransmissions within the T1 duration does not reach the maximum value, so that the terminal device cannot trigger the RRC reconstruction in time.

Based on this, the embodiments of the present application provide a communication method and apparatus to solve the problem of a sharp increase in the time required for a UE to perform RLF determination in an NTN communication system, resulting in a longer communication delay and a waste of power for the UE. Among them, the method and the device are based on the same technical concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

It should be understood that, in the embodiments of the present application, "at least one" refers to one or more, and "a plurality" refers to two or more. "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one (item) of the following" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural item (item). For example, at least one (a) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.

It should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and should not be interpreted as indicating or implying relative importance, nor can it be understood as indicating or implying order.

It should be noted that, before the terminal device initiates RRC re-establishment, the network device that establishes the connection last may be referred to as serving network device, anchor network device (anchor gNB), source network device, etc., and the last connected cell before initiating RRC re-establishment. called the source cell.

The communication method provided by the present application will be described in detail below with reference to the accompanying drawings.

The embodiments of the present application provide two communication methods. The method can be applied but not limited to the following scenarios: LEO/GEO as an independent base station, connected to the core network; LEO/GEO as a relay base station, connected to a ground base station; LEO as a DU, connected to a ground CU; orbital satellite communications.

Example 1:

As shown in FIG. 11 , a communication method provided by an embodiment of the present application. The method can be applied to a terminal device, or a chip, or a chipset, or a functional module in the chip that executes the method, and so on. Taking a terminal device as an example, the communication process may specifically include:

S1101, the terminal device acquires the remaining coverage duration of the serving cell covering the first geographical area, and the terminal device is located in the first geographical area.

In an implementation manner, the network device may send coverage time information of the serving cell to the terminal device, and the terminal device may determine the remaining coverage duration of the serving cell covering the first geographic area according to the coverage time information.

Exemplarily, the coverage time information may be the remaining coverage time of the serving cell covering the first geographic area. Alternatively, the coverage time information may also be a remaining coverage time period during which the serving cell covers the first geographic area, for example, the coverage time information includes a start time and an end time of the remaining coverage time. Therefore, the terminal device can determine the remaining coverage duration according to the remaining coverage time period. Alternatively, the coverage time information may also be the coverage time period of the serving cell, for example, the coverage time information includes the start time and the end time of the coverage time. Therefore, the terminal device can determine the remaining coverage duration according to the coverage time period and the current time.

Optionally, the network device may send the coverage time information of the serving cell to the terminal device through a system message or RRC signaling or NAS signaling.

In another implementation manner, the terminal device may determine the remaining coverage duration according to at least one item of the following information: ephemeris information, the first geographic area, and the coverage of the serving cell. Exemplarily, the ephemeris information may include at least one item of the following information: information such as the location, running track, running speed, running direction, and the like of the network device corresponding to the serving cell.

In an example, taking the ephemeris information including the running speed and running direction of the network device corresponding to the serving cell as an example, the terminal device can be based on the running speed and running direction of the network device corresponding to the serving cell, the coverage of the serving cell, and the location of the terminal device. The location of the first geographic area determines the remaining coverage duration of the serving cell.

Optionally, the network device may send information such as ephemeris information and the coverage of the serving cell to the terminal device through a system message or RRC signaling or NAS signaling. The ephemeris information and the coverage of the serving cell may be sent through the same signaling, or may be sent through different signaling.

S1102, the terminal device determines that a radio link failure occurs when the remaining coverage duration is less than the first time threshold.

In the embodiment of the present application, the terminal device determines whether RLF occurs by the remaining coverage time of the serving cell, so that RRC re-establishment can be triggered in time when the coverage signal is weak or disappears, thereby improving the communication quality of the terminal device and reducing the communication delay. For example, as shown in FIG. 12 , the time when the RLF is determined by the remaining coverage time of the serving cell is earlier than the time when the RLF is determined according to the T310 timeout, so that the terminal device can determine the RLF in time, thereby saving signaling and saving power. The gain of the method is more obvious in satellite communication, because the distance between the satellite and the terminal equipment is very long, and the power consumption of sending a signaling is very large.

In some embodiments, the determination condition of the remaining coverage duration of the serving cell covering the first geographical area may be used in combination with the current three determination conditions (see the foregoing background introduction for details). For example, when the maximum RLC uplink retransmission occurs and the remaining coverage duration of the serving cell covering the first geographic area is less than the first threshold, it is determined that RLF occurs. For another example, when out-of-sync resynchronization and the remaining coverage duration of the serving cell covering the first geographic area is less than the first threshold, it is determined that RLF occurs. For another example, when T310 times out and the remaining coverage duration of the serving cell covering the first geographic area is less than the first threshold, it is determined that RLF occurs.

Optionally, after the terminal device determines that a radio link failure occurs, it can determine the RRC state after the radio link failure occurs according to the cell coverage information, and the cell coverage information includes at least one of the following information: the remaining coverage duration of the serving cell, N The remaining coverage time of the adjacent cell and the waiting time of M adjacent cells, where the waiting time is the time that the terminal device needs to wait to enter the coverage of the adjacent cell, and M and N are both integers greater than 0.

In an implementation manner, if the remaining coverage duration of the serving cell is greater than the second time threshold, the terminal device performs RRC re-establishment in the serving cell.

In another implementation manner, if the remaining coverage duration of the serving cell is not greater than the second time threshold, the terminal device performs cell selection.

In another implementation manner, if the remaining coverage duration of the first neighboring cell in the N neighboring cells is greater than the third time threshold, the terminal device performs RRC reconstruction in the first neighboring cell, and the first neighboring cell is one of the N neighboring cells. any of the neighboring cells.

In another implementation manner, if the first time difference is greater than the fourth time threshold, the terminal device performs RRC reconstruction in the second neighboring cell, and the first time difference is the remaining coverage time of the second neighboring cell minus the remaining coverage time of the serving cell. As a result, the second neighboring cell is any one of the N neighboring cells.

In another implementation manner, if the remaining coverage duration of the serving cell is less than the fifth threshold and the remaining coverage duration of the third neighboring cell is greater than the sixth threshold, the terminal device performs RRC reconstruction in the third neighboring cell, and the third neighboring cell is The cell with the longest remaining coverage time among the N neighboring cells.

In another implementation manner, if the remaining coverage time of the serving cell is less than the fifth threshold, the terminal device performs RRC reconstruction in the third neighbor cell, which is the cell with the longest remaining coverage time among the N neighbor cells.

In another implementation manner, if the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the fourth neighboring cell, and the fourth neighboring cell has the shortest waiting duration among the M neighboring cells. 's district.

In another implementation manner, if the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the fifth neighboring cell, and the fifth neighboring cell is one of the M neighboring cells whose waiting duration is not longer than the seventh threshold. The cell that is greater than the eighth threshold and has the longest coverage time in the first geographic area.

In another implementation manner, if the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the sixth neighboring cell, and the sixth neighboring cell has the highest metric value among the M neighboring cells. The metric value is determined according to the waiting duration of the neighboring cell and the coverage duration covering the first geographic area.

For example, the metric value can be the waiting time and the weighted value of the coverage time.

In another implementation manner, if the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, and the waiting durations of the M neighboring cells are all greater than the eighth threshold, the terminal device enters the RRC idle state.

In another implementation manner, if the remaining coverage time of the serving cell is less than the fifth threshold, the terminal device performs RRC reconstruction in the seventh neighbor cell, and the seventh neighbor cell is any one of the N neighbor cells whose remaining coverage time is greater than the eighth threshold. community.

Optionally, the manner in which the terminal device obtains the remaining coverage duration and the waiting duration of the neighboring cell is similar to the manner in which the terminal device obtains the remaining coverage duration of the serving cell, and details are not repeated here.

Exemplarily, the terminal device can perform RRC re-establishment through the following process, as shown in Figure 13:

S1301, the terminal device sends an RRC reestablishment request message (RRC Reestablishment Request) to the first network device. The first network device may be a network device corresponding to a serving cell or a network device corresponding to a neighboring cell, for example, a network device corresponding to the first neighboring cell, a network device corresponding to the second neighboring cell, and a network device corresponding to the third neighboring cell. network equipment, etc.

S1302, the first network device sends a restore UE context request message (Retrieve UE Context Request) to the second network device. The second network device may be a network device corresponding to the serving cell.

S1303, the second network device sends a request response (Retrieve UE Context Response) to the first network device.

If the second network device does not have the context of the terminal device, it sends a UE context recovery failure message (RETRIEVE UE CONTEXT FAILURE) to the first network device.

It should be noted that steps S1302 and S1303 are not necessarily steps to be performed. For example, when the first network device is a network device corresponding to the serving cell, S1302 Huawei S1303 may not be performed.

S1304, the first network device sends an RRC re-establishment message to the terminal device.

Optionally, the first network device may send an RRC reconfiguration message after sending the RRC re-establishment message to the terminal device.

S1305, the terminal device sends an RRC re-establishment complete message to the first network device.

Optionally, the terminal device sends an RRC reconfiguration complete message to the first network device.

S1306, the first network device sends a data forwarding address indication to the second network device.

If the second network device has downlink data to be sent to the terminal device, the data may be forwarded to the first network device after obtaining the data forwarding address.

S1307, the first network device sends a path switch request message to an access and mobility management function (access and mobility management function, AMF), instructing the AMF to send the downlink data to the first network device.

S1308, the AMF sends a path switching request response message to the first network device.

S1309, the first network device notifies the second network device to release the context of the terminal device.

It should be understood that the above RRC re-establishment process is only an exemplary illustration, and in specific implementation, only some steps in the above process may be performed, and steps other than the above process may also be performed.

In addition, the terminal device can also send an RRC re-establishment report, and the RRC re-establishment report carries the reason for the RRC re-establishment. The reason for the RRC re-establishment is related to the coverage time of the serving cell. For example, the reason for the RRC re-establishment is that the remaining coverage time of the serving cell is shorter than the first time. The threshold, for example, the reason for the RRC re-establishment is that the remaining coverage duration of the serving cell is 0, etc.

Alternatively, the reason for RRC re-establishment may also be related to the coverage time of the target cell.

Optionally, after determining that the RLF occurs, the terminal device may receive the neighbor cell information sent by the network device, such as information such as the cell ID (cell ID), physical cell ID (physical cell ID, PCI), and frequency of the neighbor cell. The terminal equipment may perform RRC reconstruction in the cell corresponding to the neighbor cell information. In this way, the terminal equipment can skip the process of cell selection and perform RRC re-establishment in the cell.

Wherein, the neighbor cell information may be sent by the network device through system messages or RRC signaling.

In an implementation manner, the network device may determine the neighboring cell that will cover the terminal device according to the ephemeris information and the neighboring cell management information, wherein the neighboring cell management information may include information of at least one neighboring cell of the terminal device, wherein the at least one neighboring cell A cell may include current neighbor cells, and may also include future neighbor cells as the satellite moves. The ephemeris information may include operation information of the at least one neighboring cell, and the operation information may include at least one item of the following information: operation orbit, operation speed, real-time position, and operation direction. In the above manner, the network device may determine, according to the ephemeris information, a neighboring cell that will cover the terminal device in the neighboring cell included in the neighboring cell management information, so as to send the neighboring cell information of the neighboring cell to the terminal device.

In the embodiment of the present application, the terminal device determines whether RLF occurs according to the remaining coverage time of the serving cell, so that when the coverage signal is weak or disappears, RRC re-establishment can be triggered in time or RRC idle state can be triggered, thereby saving power and signaling overhead. Improve the communication quality of terminal equipment and reduce communication delay.

Embodiment 2:

As shown in FIG. 14 , another communication method provided by an embodiment of the present application. The method can be applied to a terminal device, or a chip, or a chipset, or a functional module in the chip that executes the method, and so on. Taking a terminal device as an example, the communication process may specifically include:

S1401, the terminal device determines N suitable cells, the suitable cells can meet the coverage condition, and the optional coverage condition can be that the remaining coverage duration covering the first geographical area is greater than a first time threshold or the waiting duration is less than a second time threshold, wherein the terminal The device is located in the first geographical area, the waiting time is the time that the terminal device needs to wait for entering the coverage of the cell, and N is an integer greater than 0.

Exemplarily, for the manner in which the terminal device obtains the remaining coverage duration or waiting duration of the cell, reference may be made to the manner in which the terminal device obtains the remaining coverage duration of the serving cell covering the first geographic area in the foregoing embodiment, which will not be repeated here.

In an implementation manner, the terminal device may select N cells whose remaining coverage duration is greater than the first time threshold as suitable cells.

In another implementation manner, if the remaining coverage durations of the cells covering the first geographic area are all less than the first time threshold, the terminal device may select N cells whose waiting durations are less than the second time threshold as suitable cells.

S1402, the terminal device performs cell selection or cell reselection in N suitable cells.

In an implementation manner, the terminal device may perform cell selection or cell reselection in N suitable cells based on the S criterion or the R criterion, wherein the remaining coverage time or waiting time (or the equivalent value of the remaining coverage or waiting time) is: Offset value in S criterion or R criterion. For example, the remaining coverage duration or the waiting duration (or the converted value of the remaining coverage duration or the waiting duration) is used as Qoffset _temp in the S criterion or the R criterion.

An example is:

Srxlev=Q _rxlevmeas -(Q _rxlevmin +Q _{rxlevminOffset} )-P _compensation +Qoffset _temp ;

Squal=Q _qualmeas -(Q _qualmin +Q _{qualminOffset} )+Qoffset _temp ;

R _s =Q _meas,s +Q _hyst +Qoffset _temp ;

Wherein, Qoffset _temp is the remaining coverage time or waiting time, or Qoffset _temp is the combined value of the remaining coverage or the waiting time, for example, the remaining coverage time minus a threshold or the waiting time minus a threshold value.

Another example is:

Srxlev=Q _rxlevmeas -(Q _rxlevmin +Q _{rxlevminOffset} )-P _compensation -Qoffset _temp ;

Squal= _Qqualmeas- ( _Qqualmin + _{QqualminOffset} ) _-Qoffsettemp ;

R _s =Q _meas,s +Q _hyst -Qoffset _temp ;

Among them, Qoffset _temp is the inverse of the remaining coverage time or the opposite of the waiting time, or Qoffset _temp is the converted value of the remaining coverage time or the converted value of the waiting time, for example, a threshold minus the value of the remaining coverage time, or a The value of the threshold minus the wait time.

For another example, Qoffset _temp is used as the first offset in the S criterion or R criterion, and the remaining coverage time or waiting time (or the converted value of the remaining coverage time or waiting time) is the second offset in the S criterion or R criterion.

An example is:

Srxlev=Q _rxlevmeas -(Q _rxlevmin +Q _{rxlevminOffset} )-P _compensation -Qoffset _temp +Qoffset _time ;

Squal= _Qqualmeas- ( _Qqualmin + _{QqualminOffset} ) _-Qoffsettemp + _Qoffsettime ;

R _s =Q _meas,s +Q _hyst -Qoffset _temp +Qoffset _time ;

Among them, Qoffset _temp is the offset defined by the current protocol, Qoffset _time is the remaining coverage time or waiting time, or Qoffset _time is the converted value of the remaining coverage or waiting time. For example, the remaining coverage time minus a threshold is taken value or wait time minus a threshold.

Another example is:

Srxlev=Q _rxlevmeas -(Q _rxlevmin +Q _{rxlevminOffset} )-P _compensation -Qoffset _temp -Qoffset _time ;

Squal= _Qqualmeas- ( _Qqualmin + _{QqualminOffset} ) _-Qoffsettemp - _Qoffsettime ;

R _s =Q _meas,s +Q _hyst -Qoffset _temp -Qoffset _time ;

Wherein, Qoffset _temp can be the opposite number of the remaining coverage time or the opposite number of the waiting time, or Qoffset _temp can also be the converted value of the remaining coverage time or the converted value of the waiting time, for example, a threshold minus the value of the remaining coverage time Alternatively, a threshold minus the wait time.

Based on the same technical concept as the method embodiments, the embodiments of the present application provide a communication device. The structure of the communication device may be as shown in FIG. 15 , including a processing unit 1501 and a transceiver unit 1502 . Specifically, the communication apparatus can be used to implement the method performed by the terminal device in the above-mentioned embodiment, and the apparatus can be the terminal device itself, or a chip or a chipset in the terminal device or a part of the chip for executing the function of the related method.

In an implementation manner, the transceiver unit 1502 is used to send and receive information. The processing unit 1501 is configured to: obtain the remaining coverage time of the current serving cell of the communication device covering the first geographical area through the information sent and received by the transceiver unit, and the communication device is located in the first geographical area; when the remaining coverage time is less than the first time threshold, determine that wireless Link failed.

In an achievable manner, the transceiver unit 1502 may be specifically configured to receive coverage time information of the serving cell of the network device. When acquiring the remaining coverage duration of the serving cell covering the first geographic area, the corresponding processing unit 1501 is specifically configured to determine the remaining coverage duration according to the coverage time information.

Exemplarily, the coverage time information may be the remaining coverage time, or the coverage time information may also be the remaining coverage time period of the serving cell covering the first geographic area, or the coverage time information may also be the coverage time period of the serving cell.

In another achievable manner, the transceiver unit 1502 may be specifically configured to receive ephemeris data from the network device; correspondingly, the processing unit 1501, when acquiring the remaining coverage duration of the serving cell covering the first geographical area, is specifically used for The remaining coverage duration is determined according to the ephemeris information and the first geographic area.

Optionally, the processing unit 1501 is further configured to: after it is determined that the radio link failure occurs when the remaining coverage duration is less than the first time threshold, determine the radio resource control RRC state after the radio link failure occurs according to the cell coverage information, and the cell coverage The information includes at least one item of the following information: the remaining coverage duration of the serving cell, the remaining coverage duration of the N neighboring cells, and the waiting duration of the M neighboring cells, where the waiting duration is the amount of time that the terminal device needs to wait for entering the coverage of the neighboring cells. The duration, M and N are both integers greater than 0.

The processing unit 1501, when determining the RRC state after the radio link failure occurs according to the cell coverage information, can specifically perform the following different operations according to the situation, and of course other operations, which are not limited in this application:

When the remaining coverage duration of the serving cell is greater than the second time threshold, perform RRC reconstruction in the serving cell;

When the remaining coverage duration of the serving cell is not greater than the second time threshold, cell selection is performed;

When the remaining coverage duration of the first adjacent cell in the N adjacent cells is greater than the third time threshold, the terminal device performs RRC reconstruction in the first adjacent cell, and the first adjacent cell is any adjacent cell in the N adjacent cells;

When the first time difference is greater than the fourth time threshold, RRC reconstruction is performed in the second adjacent cell, the first time difference is the result of the remaining coverage time of the second adjacent cell minus the remaining coverage time of the serving cell, and the second adjacent cell is N neighbors. any neighbor cell in the cell;

When the remaining coverage duration of the serving cell is less than the fifth threshold and the remaining coverage duration of the third neighboring cell is greater than the sixth threshold, the RRC reconstruction is performed in the third neighboring cell, and the third neighboring cell is the longest remaining coverage time among the N neighboring cells. the district;

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, perform RRC reconstruction in the fourth neighboring cell, which is the cell with the shortest waiting time among the M neighboring cells;

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, perform RRC reconstruction in the fifth neighboring cell. The cell with the longest area coverage;

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the RRC reconstruction is performed in the sixth neighboring cell, which is the cell with the highest metric value among the M neighboring cells, and the metric value is based on the neighboring cells. The waiting time and the coverage time covering the first geographical area are determined;

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, and the waiting durations of the M neighboring cells are all greater than the eighth threshold, the RRC idle state is entered.

The transceiver unit 1502 may also be configured to send an RRC re-establishment report, where the RRC re-establishment report carries the RRC re-establishment reason, and the RRC re-establishment reason is related to the coverage time of the serving cell.

In another implementation manner, the transceiver unit 1502 is used to send and receive information; the processing unit 1501 is used to determine N suitable cells, the suitable cells meet the coverage condition, and the coverage condition is that the remaining coverage duration covering the first geographical area is greater than the first time The threshold or the waiting time is less than the second time threshold, wherein the terminal device is located in the first geographical area, the waiting time is the time that the terminal device needs to wait for entering the coverage of the cell, and N is an integer greater than 0; Cell selection or cell reselection is performed in a suitable cell.

The processing unit 1501, when determining N suitable cells, may specifically select N cells whose remaining coverage durations are greater than the first time threshold as suitable cells; or, the remaining coverage durations of the cells covering the first geographical area are all less than the first time threshold. , select N cells whose waiting time is less than the second time threshold as suitable cells.

Optionally, when the processing unit 1501 performs cell selection or cell reselection in N suitable cells, specifically, the transceiver unit 1502 may perform cell selection or cell reselection in N suitable cells based on the S criterion or the R criterion, wherein, The remaining coverage duration or waiting duration is the offset value in the S criterion or the R criterion.

The division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods. In addition, the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It can be understood that, for the functions or implementations of each module in the embodiments of the present application, further reference may be made to the related descriptions of the method embodiments.

In a possible manner, the communication device may be as shown in FIG. 16 . The communication apparatus may include a processor 1601 , a communication interface 1603 , and optionally, a memory 1602 . The processing unit 1501 may be the processor 1601 . The transceiver unit 1502 may be the communication interface 1603 .

The processor 1601 may be a central processing unit (central processing unit, CPU), or a digital processing unit or the like. The communication interface 1603 may be a transceiver, an interface circuit such as a transceiver circuit, or a transceiver chip or the like. The memory 1602 is used to store programs executed by the processor 1601 . The memory 1602 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), such as random access memory (random access memory). -access memory, RAM). Memory 1602 is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The processor 1601 is configured to execute the program codes stored in the memory 1602, and is specifically configured to execute the actions of the above-mentioned processing unit 1501, which will not be repeated in this application. The communication interface 1603 is specifically configured to perform the operations of the above-mentioned transceiver unit 1502, and details are not described herein again in this application.

The specific connection medium among the above-mentioned communication interface 1603 , the processor 1601 , and the memory 1602 is not limited in this embodiment of the present application. In the embodiment of the present application, the memory 1602, the processor 1601, and the communication interface 1603 are connected through a bus 1604 in FIG. 16. The bus is represented by a thick line in FIG. 16, and the connection between other components is only for schematic illustration. , is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in FIG. 16, but it does not mean that there is only one bus or one type of bus.

An embodiment of the present invention further provides a computer-readable storage medium for storing computer software instructions to be executed for executing the above-mentioned processor, which includes a program to be executed for executing the above-mentioned processor.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

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

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A communication method, comprising:

The terminal device acquires the remaining coverage duration of the serving cell covering the first geographical area, and the terminal device is located in the first geographical area;

The terminal device determines that a radio link failure occurs when the remaining coverage duration is less than the first time threshold.
The method according to claim 1, wherein, the terminal device acquiring the remaining coverage duration of the serving cell covering the first geographical area, comprising:

receiving, by the terminal device, coverage time information of the serving cell from a network device;

The terminal device determines the remaining coverage duration according to the coverage time information.
The method according to claim 2, wherein the coverage time information is the remaining coverage time length, or the coverage time information is the remaining coverage time period during which the serving cell covers the first geographic area, Or, the coverage time information is the coverage time period of the serving cell.
The method according to claim 1, wherein, the terminal device acquiring the remaining coverage duration of the serving cell covering the first geographical area, comprising:

The terminal device determines the remaining coverage duration according to the ephemeris information and the first geographical area.
The method according to any one of claims 1-4, wherein after the terminal device determines that a radio link failure occurs when the remaining coverage duration is less than a first time threshold, the method further comprises:

The terminal device determines the radio resource control RRC state after the radio link failure occurs according to the cell coverage information, where the cell coverage information includes at least one of the following information:

The remaining coverage duration of the serving cell, the remaining coverage duration of N neighboring cells, and the waiting duration of M neighboring cells, wherein the waiting duration is the duration that the terminal device needs to wait for entering the coverage of the neighboring cells , the M and N are both integers greater than 0.
The method according to claim 5, wherein the terminal equipment determines the RRC state after the radio link failure occurs according to the cell coverage information, comprising:

When the remaining coverage duration of the serving cell is greater than a second time threshold, the terminal device performs RRC re-establishment in the serving cell; or

When the remaining coverage duration of the serving cell is not greater than the second time threshold, the terminal device performs cell selection; or

When the remaining coverage duration of the first neighboring cell in the N neighboring cells is greater than the third time threshold, the terminal device performs RRC reconstruction in the first neighboring cell, and the first neighboring cell is the N neighboring cells. any neighboring cell in the cell; or

When the first time difference is greater than the fourth time threshold, the terminal device performs RRC reconstruction in the second neighbor cell, and the first time difference is the remaining coverage time of the second neighbor cell minus the remaining coverage time of the serving cell. As a result, the second neighboring cell is any one of the N neighboring cells; or

When the remaining coverage duration of the serving cell is less than the fifth threshold and the remaining coverage duration of the third neighboring cell is greater than the sixth threshold, the terminal device performs RRC reconstruction in the third neighboring cell, and the third neighboring cell is The cell with the longest remaining coverage time among the N neighboring cells; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the fourth neighboring cell, and the fourth neighboring cell is waiting in the M neighboring cells. the cell with the shortest duration; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the fifth neighboring cell, and the fifth neighboring cell is waiting in the M neighboring cells. the cell whose duration is not greater than the eighth threshold and has the longest coverage duration in the first geographic area; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, the terminal device performs RRC reconstruction in the sixth neighboring cell, and the sixth neighboring cell is the metric among the M neighboring cells. The cell with the highest value, the metric value is determined according to the waiting time of the neighboring cell and the coverage time covering the first geographical area; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, and the waiting durations of the M neighboring cells are all greater than the eighth threshold, the terminal device enters the RRC idle state.
The method according to any one of claims 1-6, wherein the method further comprises:

The terminal equipment sends an RRC re-establishment report, where the RRC re-establishment report carries the RRC re-establishment reason, and the RRC re-establishment reason is related to the coverage time of the serving cell.
A communication method, comprising:

The terminal device determines N suitable cells, and the suitable cells meet a coverage condition, and the coverage condition is that the remaining coverage duration covering the first geographical area is greater than the first time threshold or the waiting duration is less than the second time threshold, wherein the terminal device is located in the first geographical area, the waiting duration is the duration that the terminal device needs to wait for entering the coverage of the cell, and the N is an integer greater than 0;

The terminal equipment performs cell selection or cell reselection among the N suitable cells.
The method of claim 8, wherein the terminal equipment determines N suitable cells, comprising:

The terminal equipment selects N cells whose remaining coverage duration is greater than the first time threshold as suitable cells; or

When the remaining coverage durations of the cells covering the first geographic area are all less than the first time threshold, the terminal device selects N cells whose waiting durations are less than the second time threshold as suitable cells.
The method according to claim 8 or 9, wherein the terminal equipment performs cell selection or cell reselection in the N suitable cells, comprising:

The terminal device performs cell selection or cell reselection in the N suitable cells based on the S criterion or the R criterion, wherein the remaining coverage duration or the waiting duration is one of the S criterion or the R criterion. offset value.
A communication device, comprising:

A transceiver unit for sending and receiving information;

Processing unit for:

Obtain the remaining coverage duration of the current serving cell of the communication device covering the first geographic area through the information sent and received by the transceiver unit, and the communication device is located in the first geographic area;

It is determined that a radio link failure occurs when the remaining coverage duration is less than the first time threshold.
The apparatus according to claim 11, wherein the transceiver unit is specifically configured to: receive coverage time information of the serving cell from a network device;

The processing unit is specifically configured to determine the remaining coverage duration according to the coverage time information when acquiring the remaining coverage duration of the serving cell covering the first geographical area.
The apparatus according to claim 12, wherein the coverage time information is the remaining coverage time length, or the coverage time information is the remaining coverage time period during which the serving cell covers the first geographic area, Or, the coverage time information is the coverage time period of the serving cell.
The apparatus of claim 11, wherein the transceiver unit is specifically configured to receive ephemeris data from a network device;

The processing unit is specifically configured to: determine the remaining coverage duration according to the ephemeris information and the first geographical area when acquiring the remaining coverage duration of the current serving cell of the communication device covering the first geographical area.
The apparatus according to any one of claims 11-14, wherein the processing unit is further configured to:

After it is determined that the radio link failure occurs when the remaining coverage duration is less than the first time threshold, the radio resource control RRC state after the radio link failure occurs is determined according to the cell coverage information, where the cell coverage information includes at least one of the following information :

The remaining coverage duration of the serving cell, the remaining coverage duration of N neighboring cells, and the waiting duration of M neighboring cells, wherein the waiting duration is the duration that the terminal device needs to wait for entering the coverage of the neighboring cells , the M and N are both integers greater than 0.
The apparatus according to claim 15, wherein the processing unit, when determining the RRC state after the radio link failure occurs according to the cell coverage information, is specifically configured to:

When the remaining coverage duration of the serving cell is greater than the second time threshold, perform RRC re-establishment in the serving cell; or

When the remaining coverage duration of the serving cell is not greater than the second time threshold, cell selection is performed; or

When the remaining coverage duration of the first neighboring cell in the N neighboring cells is greater than the third time threshold, the terminal device performs RRC reconstruction in the first neighboring cell, and the first neighboring cell is the N neighboring cells. any neighboring cell in the cell; or

When the first time difference is greater than the fourth time threshold, perform RRC reconstruction in the second neighboring cell, the first time difference is the result of subtracting the remaining coverage time of the second neighbor cell from the remaining coverage time of the serving cell, and the The second neighboring cell is any one of the N neighboring cells; or

When the remaining coverage duration of the serving cell is less than the fifth threshold, and the remaining coverage duration of the third neighboring cell is greater than the sixth threshold, perform RRC reconstruction in the third neighboring cell, where the N third neighboring cells are The cell with the longest remaining coverage time among the neighboring cells; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, perform RRC reconstruction in the fourth neighboring cell, where the fourth neighboring cell is the cell with the shortest waiting duration among the M neighboring cells ;or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, RRC reconstruction is performed in the fifth neighboring cell, and the fifth neighboring cell is the waiting duration in the M neighboring cells that is not greater than the seventh threshold. Eight thresholds, and the cell with the longest coverage time in the first geographic area; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, perform RRC reconstruction in the sixth neighboring cell, where the sixth neighboring cell is the cell with the highest metric value among the M neighboring cells , the metric value is determined according to the waiting duration of the neighboring cell and the coverage duration covering the first geographic area; or

When the remaining coverage durations of the serving cell and the N neighboring cells are both less than the seventh threshold, and the waiting durations of the M neighboring cells are all greater than the eighth threshold, the RRC idle state is entered.
The device according to any one of claims 11-16, wherein the transceiver unit is further configured to:

An RRC re-establishment report is sent, where the RRC re-establishment report carries an RRC re-establishment reason, and the RRC re-establishment reason is related to the coverage time of the serving cell.
A communication device, comprising:

A transceiver unit for sending and receiving information;

Processing unit for:

Determine N suitable cells, the suitable cells meet the coverage condition, and the coverage condition is that the remaining coverage duration covering the first geographical area is greater than the first time threshold or the waiting duration is less than the second time threshold, wherein the terminal device is located in the first geographical area. a geographical area, the waiting time length is the time length that the terminal device needs to wait for entering the coverage of the cell, and the N is an integer greater than 0;

Cell selection or cell reselection is performed in the N suitable cells by the transceiver unit.
The apparatus according to claim 18, wherein the processing unit, when determining N suitable cells, is specifically configured to:

Select N cells whose remaining coverage duration is greater than the first time threshold as suitable cells; or

When the remaining coverage durations of the cells covering the first geographic area are all less than the first time threshold, N cells whose waiting durations are less than the second time threshold are selected as suitable cells.
The apparatus according to claim 18 or 19, wherein the processing unit, when performing cell selection or cell reselection in the N suitable cells by the transceiver unit, is specifically configured to:

The transceiver unit performs cell selection or cell reselection in the N suitable cells based on the S criterion or the R criterion, wherein the remaining coverage duration or the waiting duration is one of the S criterion or the R criterion. offset value.
A communication device, characterized in that the communication device comprises a transceiver, a processor and a memory; program instructions are stored in the memory; when the program instructions are executed, the communication device is made to perform the method as claimed in claim 1 The method according to any one of claims 8 to 7, or, the communication device is caused to perform the method according to any one of claims 8 to 10.
A chip, characterized in that the chip is coupled to a memory in an electronic device, so that the chip invokes program instructions stored in the memory when running, so as to implement the method according to any one of claims 1 to 7, Alternatively, a method as claimed in any one of claims 8 to 10 is implemented.
A computer-readable storage medium, characterized in that, the computer-readable storage medium comprises program instructions, when the program instructions are executed on a device, the device is made to perform any one of claims 1 to 7. The method, alternatively, implements a method as claimed in any one of claims 8 to 10.