CN117204049A

CN117204049A - Communication method and device

Info

Publication number: CN117204049A
Application number: CN202180097200.1A
Authority: CN
Inventors: 胡奕; 李海涛
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2023-12-08
Also published as: WO2022227086A1

Abstract

The application provides a communication method and a device, wherein the method comprises the following steps: the terminal device transmits a first message to the network device at a first time (S201). If the search space set group switching is triggered and the terminal device listens to the physical downlink control channel based on the first search space set group at the second time, the terminal device switches from being based on the first search space set group to being based on the second search space set group (S202). In the communication system with larger transmission delay such as the NTN network, when the terminal equipment sends the message capable of triggering the search space set grouping switching to the network equipment, the search space set grouping switching is carried out at a second moment after the first moment of sending the message, so that the condition that the terminal equipment and the network equipment understand the used search space set grouping consistently in the period from the time of sending the message to the time of receiving the message by the network equipment is ensured.

Description

Communication method and device

Technical Field

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

Background

The third generation partnership project (3rd Generation Partnership Project,3GPP) is currently researching non-terrestrial communication network (Non Terrestrial Network, NTN) technology. NTN typically provides communication services to terrestrial users by way of satellite communications. Compared with the ground cellular network communication, the satellite communication has the characteristics of no limitation of user regions, higher social value, long communication distance, high communication stability and the like.

In the related art, in order to make the connected terminal device more energy-saving, the physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring behavior of the terminal device can be controlled by a search space set packet (Search Space Set Group, SSSG) switching mechanism to reduce the blind detection of PDCCH by the terminal device. Specifically, the network device may configure the terminal device with 2 SSSGs, where the first SSSG corresponds to a listening opportunity of a sparse PDCCH, and the second SSSG corresponds to a listening opportunity of a dense PDCCH. By monitoring the PDCCH by using the second SSSG, more timely scheduling can be realized, and service time delay is reduced; the purpose of saving power of the terminal equipment can be achieved by using the first SSSG to monitor the PDCCH.

The terminal device may trigger SSSG handover in case of transmitting a message such as a scheduling request (Scheduling Request, SR) or a random access request. In a terrestrial network, the cell coverage is relatively small, the signal transmission delay between the terminal device and the network device is short, and the terminal device can immediately perform SSSG switching after the terminal device sends a message. However, in a communication system with a large transmission delay such as NTN, if the SSSG switching mechanism of the terrestrial network is used, the terminal device and the network device may not understand the used search space set packet uniformly during the period that the terminal device sends a message to the network device and receives the message.

Content of the application

The embodiment of the application provides a communication method and a communication device, which are used for solving the problem that in the prior art, in a period from a terminal device to a network device which receives a message, the terminal device and the network device are inconsistent in understanding of a used search space set group.

A first aspect of the present application provides a communication method, the method comprising:

the terminal equipment sends a first message to the network equipment at a first moment;

and if the search space set grouping switching is triggered and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal equipment switches from the first search space set grouping to the second search space set grouping based on the physical downlink control channel.

In an alternative embodiment, the second set of search spaces corresponds to a physical downlink control channel having denser listening opportunities than the first set of search spaces.

In an alternative embodiment, the first message includes a scheduling request.

In an alternative embodiment, the first message is in a waiting state at the second moment.

In an alternative embodiment, the first message comprises a random access request.

In an alternative embodiment, the random access request includes message 1 of a four-step random access or message a of a two-step random access.

In an alternative embodiment, the first and second groupings of search space sets are determined based on configuration information of the network device.

In an alternative embodiment, the second time is determined according to the first time and a target time offset, or according to a timer started at the first time.

In an optional implementation manner, the time offset is determined according to round trip delay of the terminal device and the network device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the network device, or is preset information of the terminal device.

In an alternative embodiment, the configuration information is carried on broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

A second aspect of the present application provides a communication method, the method comprising:

The network equipment receives a first message sent by the terminal equipment at a first moment, wherein the first message triggers search space set grouping switching, and the search space set grouping switching is used for switching the terminal equipment from being based on the first search space set grouping to being based on the second search space set grouping to monitor a physical downlink control channel;

and the network equipment sends response information to the terminal equipment in the physical downlink control channel.

In an alternative embodiment, the first message includes a scheduling request.

A third aspect of the present application provides a communication apparatus, the apparatus comprising:

a sending module, configured to send a first message to a network device at a first moment;

and the processing module is used for switching from the first search space set grouping to the second search space set grouping to monitor the physical downlink control channel if the search space set grouping switching is triggered and the communication device monitors the physical downlink control channel based on the first search space set grouping at the second moment.

In an alternative embodiment, the first message includes a scheduling request.

In an alternative implementation manner, the time offset is determined according to round trip time delay of the communication device and the network equipment, or is determined according to an uplink timing advance of the communication device, or is determined according to configuration information sent by the network equipment, or is preset information of the terminal equipment.

A fourth aspect of the present application provides a communication apparatus, the apparatus comprising:

the receiving module is used for receiving a first message sent by the terminal equipment at a first moment, the first message triggers search space set grouping switching, and the search space set grouping switching is used for switching the terminal equipment from being based on the first search space set grouping to being based on the second search space set grouping to monitor a physical downlink control channel.

And the sending module is used for sending response information to the terminal equipment in the physical downlink control channel.

In an alternative embodiment, the first message includes a scheduling request.

In an alternative embodiment, the first and second groupings of search space sets are determined based on configuration information of the communication device.

In an alternative implementation manner, the time offset is determined according to round trip delay of the terminal device and the communication device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the communication device, or is preset information of the terminal device.

A fifth aspect of the present application provides a terminal device, comprising:

a processor, a memory, a receiver, and an interface to communicate with a network device;

the memory stores computer-executable instructions;

The processor executes computer-executable instructions stored by the memory to cause the processor to perform the communication method as described in the first aspect.

A sixth aspect of the present application provides a network device, including:

a processor, a memory, a transmitter, and an interface for communicating with a terminal device;

the memory stores computer-executable instructions;

the processor executes computer-executable instructions stored by the memory to cause the processor to perform the communication method as described in the second aspect.

A seventh aspect of the present application provides a chip comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method according to the first aspect.

An eighth aspect of the present application provides a chip comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method as described in the second aspect.

A ninth aspect of the application provides a computer-readable storage medium storing a computer program for causing a computer to perform the method according to the first aspect.

A tenth aspect of the application provides a computer readable storage medium storing a computer program for causing a computer to perform the method according to the first or second aspect.

An eleventh aspect of the application provides a computer program product comprising computer instructions which, when executed by a processor, implement a method as described in the first aspect.

A twelfth aspect of the application provides a computer program product comprising computer instructions which, when executed by a processor, implement the method according to the second aspect.

A thirteenth aspect of the application provides a computer program for causing a computer to carry out the method as described in the first aspect.

A fourteenth aspect of the application provides a computer program for causing a computer to perform the method as described in the second aspect.

The communication method and the device provided by the embodiment of the application have the advantage that the terminal equipment sends the first message to the network equipment at the first moment. If the search space set grouping switching is triggered and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal equipment switches from monitoring the physical downlink control channel based on the first search space set grouping to monitoring the physical downlink control channel based on the second search space set grouping. In this way, in a communication system with a larger transmission delay such as an NTN network, when the terminal device sends a message to the network device, which can trigger the switching of the search space set packet, the switching of the search space set packet is performed at a second time after the first time of sending the message, so as to ensure that the terminal device and the network device understand the used search space set packet consistently in a period from the time when the terminal device sends the message to the time when the network device receives the message.

Drawings

In order to more clearly illustrate the application or the technical solutions of the prior art, the following description of the embodiments or the drawings used in the description of the prior art will be given in brief, it being obvious that the drawings in the description below are some embodiments of the application and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a timer start according to an embodiment of the present application;

fig. 2 is a schematic diagram of a communication method according to an embodiment of the present application;

fig. 3 is a signaling interaction diagram of a communication method according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5 is a schematic diagram of SSSG switching when a terminal device sends an SR according to an embodiment of the present application;

fig. 6 is a schematic diagram of SSSG switching when another terminal device according to an embodiment of the present application sends an SR;

fig. 7 is a schematic diagram of SSSG switching when a terminal device sends an SR according to another embodiment of the present application;

fig. 8 is a flow chart of another communication method according to an embodiment of the present application;

fig. 9 is a schematic diagram of SSSG switching when a terminal device sends a random access request according to an embodiment of the present application;

Fig. 10 is a flow chart of another communication method according to an embodiment of the present application;

fig. 11 is a schematic diagram of SSSG switching when another terminal device provided in an embodiment of the present application sends a random access request;

fig. 12 is a schematic diagram of SSSG switching when still another terminal device according to an embodiment of the present application sends a random access request;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms first, second and the like in the description of embodiments of the application, in the claims and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

First, NTN technology will be described.

The NTN technology is currently being studied by 3 GPP. NTN typically provides communication services to terrestrial users by way of satellite communications. Compared with terrestrial cellular network communication, satellite communication has the following advantages: first, satellite communications are not limited by the user's territory. For satellite communication, one satellite can cover a larger ground, and the satellite can orbit around the earth, so that theoretically every corner of the earth can be covered by satellite communication. And secondly, satellite communication has higher social value. Satellite communication can be covered in remote mountain areas, poor and backward countries or regions with lower cost, so that the regions can enjoy advanced voice communication and mobile internet technology, and the digital gap between developed regions is reduced, and the development of the regions is promoted. At the very least, the satellite communication distance is far, and the cost of communication is not obviously increased when the communication distance is increased. And finally, the satellite communication has high stability and is not limited by natural disasters.

Currently, communication satellites in NTN technology can be classified into Low-Earth Orbit (LEO) satellites, medium-Earth Orbit (MEO) satellites, geosynchronous Orbit (Geostationary Earth Orbit, GEO) satellites, and high-elliptical Orbit (High Elliptical Orbit, HEO) satellites according to the Orbit heights. Of these, LEO satellites and GEO satellites are the main directions of research.

The LEO satellite has a height ranging from 500km to 1500km, and a corresponding orbital period of about 1.5 hours to 2 hours. The signal propagation delay for single hop communications between users is typically less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the user terminal is not high.

GEO satellites, with an orbital altitude of 35786km, revolve around the earth for 24 hours. The signal propagation delay for single hop communications between users is typically 250ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form tens or hundreds of beams to cover the ground; a satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter.

Next, DRX will be described.

In the New air interface (NR) of 5G, the network device may configure the DRX function for the terminal device, so that the terminal discontinuously monitors the PDCCH, so as to achieve the purpose of power saving of the terminal device. If the terminal device configures DRX, the terminal device needs to monitor the PDCCH at the DRX Active Time (DRX Active Time). The DRX Active Time includes the following three cases:

in the first case, any one of five timers (DRX-onDurationTimer, DRX-InactivityTimer, DRX-RetransmissionTimerDL, DRX-retransmission timer ul and ra-contentioResoltTimer) configured in the configuration parameters of DRX is running.

In the second case, the terminal device sends an SR on PUCCH and is in a waiting (pending) state.

In a third case, in a non-contention based random access procedure, the terminal device has not received one initial transmission of a cell radio network temporary identity (Cell Radio Network Temporary Identifier, C-RNTI) scrambled PDCCH indication after successful reception of the random access response.

Wherein the timer DRX-onduration timer is used to count the duration of the terminal device waking up at the beginning of one DRX Cycle. The terminal device may decide to start the DRX-onduration timer based on whether it is currently in a short DRX cycle (short DRX cycle) or a long DRX cycle (long DRX cycle).

Fig. 1 is a schematic diagram of a timer start according to an embodiment of the present application. As shown in fig. 1, in the duration of the terminal device listening to the PDCCH, if a short DRX cycle is used and the current subframe satisfies the formula (1), or if a long DRX cycle is used and the current subframe satisfies the formula (2), the DRX-onduration timer is started at a time after the DRX-SlotOffset time slots at the beginning of the current subframe. The formula (1) and the formula (2) are as follows: [ (SFN×10) +subframe number ] module = (drx-ShortCycle) module = (drx-StartOffset) (1)

[(SFN×10)+subframe number]modulo(drx-LongCycle)＝drx-StartOffset (2)

Wherein SFN is a system frame number (System Frame Number, SFN), module is modulo calculation, subframe number is a subframe number, and DRX-StartOffset is a subframe offset from which DRX Cycle starts.

The SR will be explained again.

The terminal device may apply for uplink resources to the network device through the SR. Since the network device cannot determine when the terminal device generates the SR, the network device may allocate a periodic PUCCH resource for transmitting the SR to the terminal device. Then, the network device detects whether there is an SR report on the PUCCH resource for transmitting an SR that has been allocated.

It should be appreciated that the SRs in the NR are based on logical channels. For each uplink logical channel, the network device may select whether PUCCH resources for transmitting SRs are configured for the uplink logical channel. If the network device configures a PUCCH resource for transmitting SR for an uplink logical channel under the condition that the uplink logical channel triggers SR, the terminal transmits SR on the PUCCH resource for transmitting SR corresponding to the logical channel; otherwise, the terminal device may initiate random access.

In addition, the following two terminal devices may trigger SR.

In a first manner, if the terminal device triggers beam failure recovery (Beam Failure Recovery, BFR) on at least one Secondary Cell (SCell), and the terminal device currently has no uplink resources available for initial transmission or the terminal device currently has uplink resources available for initial transmission but the resources are insufficient to carry BFR media access control resources (Medium Access Control Communication Edge, MAC CE) or reduced buffer status report (Buffer Status Report, BSR) MAC CE, the terminal device triggers SR.

In a second manner, if the terminal device triggers a persistent listen-before-transmit (Listen before talk, LBT) failure on at least one SCell, and the terminal device currently has no uplink resources available for initial transmission or the terminal device currently has uplink resources available for initial transmission but the resources are insufficient to carry LBT MAC CE failure, the terminal device triggers an SR.

In addition, the network device may configure the terminal device with a plurality of PUCCH resources for transmitting SRs. For an uplink logical channel, if the network device configures PUCCH resources for transmitting SRs for the uplink logical channel, on each uplink working Bandwidth (BWP), the network device configures at most one PUCCH resource for transmitting SRs for the logical channel. The configuration parameters corresponding to each PUCCH resource for transmitting SR include: PUCCH resource period and slot/time symbol offset, and PUCCH resource index.

Finally, SSSG switching is described.

At present, the triggering mode of SSSG switching mainly comprises that network equipment instructs terminal equipment to perform SSSG switching or the terminal equipment actively triggers SSSG switching.

For the manner in which the network device instructs the terminal device to perform SSSG switching, the network device may instruct the terminal device which SSSG to use to listen to the PDCCH by sending dynamic signaling. When the terminal device receives a dynamic signaling indicating SSSG switching, the terminal device may perform SSSG switching based on the dynamic signaling.

The method for actively triggering SSSG switching by the terminal equipment is mainly applicable to the mode that the terminal equipment sends SR to the network equipment or the terminal equipment triggers a random access channel (Random Access Channel, RACH).

When the terminal device sends a message such as an SR or a random access request, the response of the network device is expected, so that the terminal device has a more urgent PDCCH monitoring requirement. Therefore, if the terminal device is currently using the sparse SSSG to perform PDCCH monitoring, after the UE sends the SR or the random access request, the terminal device needs to switch to the dense SSSG to perform PDCCH monitoring. From the perspective of the network device, the network device may only learn the scheduling needs of the terminal device after receiving the uplink message of the terminal device, while the network device does not learn the scheduling needs of the terminal device until the network device receives the uplink message of the terminal device.

In a terrestrial network, the cell coverage is relatively small, the signal transmission delay between the terminal device and the network device is short, and the terminal device can immediately perform SSSG switching after the terminal device sends a message. However, in a communication system with a large transmission delay such as NTN, if the SSSG switching mechanism of the terrestrial network is used, the terminal device and the network device may not understand the used search space set packet uniformly during the period that the terminal device sends a message to the network device and receives the message. At the same time, too early switching of the terminal device to a dense SSSG increases unnecessary power consumption of the terminal device.

In order to solve the technical problems, the embodiments of the present application provide a communication method and apparatus, after a terminal device sends a message to a network device, where the message can trigger switching of a search space set packet, the terminal device switches from a first search space set packet to a second search space set packet based on monitoring a physical downlink control channel after a preset time interval, so that it is ensured that the terminal device and the network device understand the used search space set packet consistently in a period from when the terminal device sends the message to when the network device receives the message.

It should be noted that, besides NTN communication systems, the technical solution of the embodiment of the present application may be applied to various communication systems, which is not limited by the embodiment of the present application. For example: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD) system, long term evolution advanced (Advanced long term evolution, LTE-a) system, new Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed band, NR (NR-based access to unlicensed spectrum, NR-U) system on unlicensed band, universal mobile communication system (Universal Mobile Telecommunication System, UMTS), universal internet microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication system, wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, wiFi), next generation communication system or other communication system, etc.

The following illustrates an application scenario of the present application.

Fig. 2 is a schematic diagram of a communication method according to an embodiment of the present application. As shown in fig. 2, a procedure of search space set grouping switching is performed for the terminal apparatus 101. After the terminal device 101 sends a message such as SR or a random access request to the network device 102 at the first moment, if the message can trigger the search space set packet switching, the terminal device 102 switches from being based on the first search space set packet to being based on the second search space set packet to monitor the physical downlink control channel at the second moment. Meanwhile, the network device 102, after receiving the message sent by the terminal device 101, sends response information to the terminal device 101 on the physical downlink control channel.

Wherein the mobile terminal 11 includes, but is not limited to, a satellite or cellular telephone, a personal communications system (Personal Communications System, PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; a PDA that can include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a global positioning system (Global Positioning System, GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal device may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolved PLMN, etc.

Network device 12 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area. Alternatively, the network device 102 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle device, a wearable device, a hub, a switch, a bridge, a router, a network device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

The technical solutions of the embodiments of the present application are described in detail below with specific embodiments by taking terminal devices and network devices as examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Fig. 3 is a signaling interaction diagram of a communication method according to an embodiment of the present application. The implementation main body of the embodiment of the application is terminal equipment and network equipment, and relates to a specific process of how the terminal equipment switches search space set groups. As shown in fig. 3, the method includes:

S201, the terminal equipment sends a first message to the network equipment at a first moment.

In the embodiment of the application, the switching of the SSSG of the terminal equipment can be triggered by the indication of the network equipment, and the SSSG switching can also be actively performed by the terminal equipment. Wherein, the terminal device actively performs SSSG switching can be triggered by sending a first message to the network device.

The embodiment of the application does not limit the type of the message which can trigger the terminal equipment to actively perform SSSG switching, and the first message comprises a scheduling request (Scheduling Request, SR) and a random access request.

In some embodiments, the random access request may be sent to the network device after the random access (Random Access Channel, RACH) is triggered by the terminal device. Wherein the random access request includes a message 1 (msg 1) of four-step random access or a message a (msgA) of two-step random access, which the embodiment of the present application does not limit.

It should be understood that, the first time related to the embodiment of the present application is used to characterize the time when the terminal device sends the first message, and the embodiment of the present application does not limit the value of the first time, and may be any time.

S202, if the search space set grouping switching is triggered, and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal equipment switches from the first search space set grouping to the second search space set grouping monitoring physical downlink control channel.

In this step, after the terminal device sends the first message to the network device, the terminal device may determine whether the first message may trigger SSSG switching, and if the first message may trigger SSSG switching, the terminal device switches from based on the first SSSG to based on the second SSSG to monitor the physical downlink control channel at the second moment. The network device may send response information to the terminal device in the PDCCH after receiving the first message sent by the terminal device.

The following first describes the conditions under which the terminal device triggers SSSG switching.

It should be understood that in the embodiment of the present application, the triggering of the SSSG switching by the terminal device may include the following two conditions.

The first condition is that a first message sent by the terminal device may trigger SSSG switching. Illustratively, both the SR and the random access request may trigger SSSG handoff. Wherein the random access request is sent after the terminal device triggers the RACH.

It should be noted that, the embodiment of the present application does not limit what reason the SR and RACH triggered may further trigger SSSG switching. In some embodiments, any cause-triggered SR and RACH may further trigger SSSG handoff, in other embodiments, only particular cause-triggered SR and RACH may further trigger SSSG handoff. For example, when RACH is triggered due to BFR, handover of SSSG may be triggered.

The second condition is that the terminal equipment monitors the physical downlink control channel based on the first SSSG at a second moment after the first moment corresponding to the first message.

If the two conditions are satisfied, the terminal device may perform SSSG switching at the second time.

In some embodiments, if the first message sent by the terminal device is an SR, before the terminal device performs SSSG switching, it needs to be verified whether the third condition is satisfied, that is, whether the SR is in a waiting state at the second moment. If yes, the third condition is met, and the terminal equipment can perform SSSG switching at the second moment.

In some embodiments, if the first message sent by the terminal device is a random access request, before the terminal device performs SSSG handover, it may also be verified whether a third condition is satisfied, that is, whether the terminal device has not received a response from the network device to the random access request at the second moment. If yes, the third condition is met, and the terminal equipment can perform SSSG switching at the second moment.

It should be understood that the embodiment of the present application is not limited to the value of the second time, and in some embodiments, the second time may be determined according to the first time and the target time offset. Illustratively, t2=t1+offset. Where t2 is the second time, t1 is the first time, and offset is the target time offset.

In other embodiments, the second time may also be determined based on a timer started at the first time.

It should be noted that, the target time offset may be determined by the terminal device according to the actual situation, which is not limited in the embodiment of the present application. Three ways of determining the target time offset are provided below.

For example, the terminal device may determine the value of the offset based on a Round-trip time (RTT) of a signal transmission between the terminal device and the network device. I.e. the offset is equal to the RTT of the terminal device to the network device.

Illustratively, the terminal device may determine the value of the offset based on an uplink timing advance (time advance TA) of the terminal device. I.e. offse is equal to the TA of the terminal device.

The terminal device may determine the value of the offset through configuration information sent by the network device, for example. The configuration information is carried in broadcast or radio resource control (Radio Resource Control, RRC) signaling or MAC CE or physical downlink control channel.

For example, the value of the offset may be preset information of the terminal device.

In some embodiments, the first SSSG and the second SSSG are configured by a network device. The network device may send configuration information to the terminal device to pre-configure the first SSSG and the second SSSG before the terminal device sends the first message to the network device.

It should be noted that, in the embodiment of the present application, configuration parameters of the first SSSG and the second SSSG are not limited, and may be specifically set according to actual situations.

Further, in some embodiments, the monitoring opportunities of the PDCCH corresponding to the second SSSG may be denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG. In the prior art, the terminal device immediately switches to monitoring the PDCCH based on the second SSSG after sending the first message that can trigger the SSSG switch. In the application, the terminal equipment is switched to monitor the PDCCH based on the second SSSG at a second moment after the terminal equipment sends the first message capable of triggering the SSSG switching. Therefore, in the application, between the first time and the second time, the terminal equipment still monitors the PDCCH based on the first SSSG, and because the monitoring time of the PDCCH corresponding to the second SSSG can be denser than the monitoring time of the PDCCH corresponding to the first SSSG, the unnecessary energy consumption of the terminal equipment is reduced. By the communication method, the scheduling performance of the terminal equipment can be guaranteed, and meanwhile, the power saving requirement of the terminal equipment can be met.

According to the communication method provided by the embodiment of the application, the terminal equipment sends the first message to the network equipment at the first moment. If the search space set grouping switching is triggered and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal equipment switches from monitoring the physical downlink control channel based on the first search space set grouping to monitoring the physical downlink control channel based on the second search space set grouping. In this way, in a communication system with a larger transmission delay such as an NTN network, when the terminal device sends a message to the network device, which can trigger the switching of the search space set packet, the switching of the search space set packet is performed at a second time after the first time of sending the message, so as to ensure that the terminal device and the network device understand the used search space set packet consistently in a period from the time when the terminal device sends the message to the time when the network device receives the message.

On the basis of the above embodiments, a procedure of how the terminal device performs SSSG switching when the terminal device transmits an SR to the network device will be specifically described. Fig. 4 is a flow chart of a communication method according to an embodiment of the present application. Fig. 5 is a schematic diagram of SSSG switching when a terminal device sends an SR according to an embodiment of the present application. As shown in fig. 4 and 5, the method includes:

s301, the terminal equipment sends an SR to the network equipment at a first moment.

S302, the terminal equipment determines whether the SR is one of trigger conditions of the SSSG.

If yes, step S303 is executed, and if no, step S306 is executed.

S303, the terminal equipment determines whether the SR is in the Pending state at the second moment.

If yes, step S304 is executed, and if no, step S306 is executed.

The second time may be determined according to the first time and the target time offset, or may be determined according to a timer started at the first time, which is not limited in the embodiment of the present application.

The time offset may be determined according to RTTs of the terminal device and the network device, or may be determined according to TA of the terminal device, or may be determined according to configuration information sent by the network device, or may be preset information of the terminal device. The configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

S304, the terminal equipment determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, step S305 is executed, and if no, step S306 is executed.

And S305, the terminal equipment is switched from being based on the first SSSG to being based on the second SSSG to monitor the PDCCH.

Wherein the first SSSG and the second SSSG are determined according to configuration information of the network device. The listening occasions of the PDCCH corresponding to the second SSSG are denser than the listening occasions of the PDCCH corresponding to the first SSSG.

S306, the terminal equipment monitors PDCCH based on the currently activated or used SSSG.

On the basis of fig. 4 and 5, the following provides two other flows for the terminal device to send SR to trigger SSSG switching.

Fig. 6 is a schematic diagram of SSSG switching when another terminal device according to an embodiment of the present application transmits an SR. As shown in fig. 6, the terminal device transmits an SR to the network device at time t 1. Since transmitting SR to the network device is one of the conditions for triggering SSSG switching, the terminal device is ready to switch from based on the first SSSG to based on the second SSSG listening PDCCH at time t2 separated from time t1 by offset. However, if the terminal device receives an Uplink grant (UL grant) at a time t3 between the time t1 and the time t2, the terminal device cancels the SR before the time t 2. Correspondingly, the terminal equipment does not execute SSSG switching at the time t2 either, and continues to monitor the PDCCH by using the first SSSG.

Fig. 7 is a schematic diagram of SSSG switching when a terminal device sends an SR according to another embodiment of the present application. As shown in fig. 7, the terminal device transmits an SR to the network device at time t 1. Since transmitting SR to the network device is one of the conditions for triggering SSSG switching, the terminal device is ready to switch from based on the first SSSG to based on the second SSSG listening PDCCH at time t2 separated from time t1 by offset. However, if the terminal device receives the signaling instruction of the network device at the time t3 between the time t1 and the time t2, and instructs the terminal device to switch from being based on the first SSSG to being based on the second SSSG to monitor the PDCCH, the terminal device immediately performs the SSSG switching at the time t 3. Correspondingly, the terminal equipment does not need to execute SSSG switching at the time t2, and continues to monitor the PDCCH by using the second SSSG.

On the basis of the above embodiments, a procedure of how the terminal device performs SSSG handover when the terminal device transmits a random access request to the network device will be specifically described. Fig. 8 is a flow chart of another communication method according to an embodiment of the present application. Fig. 9 is a schematic diagram of SSSG switching when a terminal device sends a random access request according to an embodiment of the present application. As shown in fig. 8 and 9, the method includes:

S401, the terminal equipment sends a random access request to the network equipment at a first moment.

Wherein the random access request is sent to the network device after the terminal device triggers the RACH.

It should be noted that, the embodiment of the present application does not limit what reason the RACH triggered may further trigger SSSG handover. In some embodiments, any cause-triggered RACH may further trigger SSSG handoff, in other embodiments, only a specific cause-triggered RACH may further trigger SSSG handoff. For example, when RACH is triggered due to BFR, handover of SSSG may be triggered.

The embodiment of the application does not limit the type of the random access request. For example, if the terminal device performs four-step random access, the terminal device sends msg1 to the network device, and if the terminal device performs two-step random access, the terminal device sends msgA to the network device.

S402, the terminal equipment determines whether the random access request is one of trigger conditions of the SSSG.

If yes, step S403 is executed, and if no, step S305 is executed.

S403, the terminal equipment determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, step S404 is executed, and if no, step S305 is executed.

S404, the terminal equipment switches from being based on the first SSSG to being based on the second SSSG to monitor the PDCCH.

S405, the terminal equipment monitors PDCCH based on the currently activated or used SSSG.

On the basis of the above embodiment, fig. 10 is a schematic flow chart of another communication method according to an embodiment of the present application. As shown in fig. 10, when the first message is a random access request, the terminal device determines whether to perform SSSG switching based on three conditions, and the method includes:

S501, the terminal equipment sends a random access request to the network equipment at a first moment.

S502, the terminal equipment determines whether the random access request is one of trigger conditions of SSSG.

If yes, step S503 is executed, and if no, step S506 is executed.

S503, the terminal device determines whether a response to the random access request sent by the network device is received before the second time.

If yes, step S504 is executed, and if no, step S506 is executed.

S504, the terminal equipment determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, step S505 is executed, and if no, step S506 is executed.

S505, the terminal equipment switches from being based on the first SSSG to being based on the second SSSG to monitor the PDCCH.

S506, the terminal equipment monitors PDCCH based on the currently activated or used SSSG.

On the basis of fig. 8-10, the following provides two other flows for triggering SSSG switching by the terminal device sending random access requests.

Fig. 11 is a schematic diagram of SSSG switching when another terminal device according to an embodiment of the present application sends a random access request. As shown in fig. 11, the terminal device transmits a random access request to the network device at time t 1. Since the random access request is sent to the network device as one of conditions for triggering SSSG switching, the terminal device is ready to switch from based on the first SSSG to based on the second SSSG to monitor the PDCCH at time t2 separated from time t1 by offset. However, if the terminal device receives an Uplink grant (UL grant) at a time t3 between the time t1 and the time t2, the terminal device does not perform the switching of the SSSG at the time t2, and continues to monitor the PDCCH using the first SSSG.

Fig. 12 is a schematic diagram of SSSG switching when still another terminal device according to an embodiment of the present application sends a random access request. As shown in fig. 12, the terminal device transmits a random access request to the network device at time t 1. Since the random access request is sent to the network device as one of conditions for triggering SSSG switching, the terminal device is ready to switch from based on the first SSSG to based on the second SSSG to monitor the PDCCH at time t2 separated from time t1 by offset. However, if the terminal device receives the signaling instruction of the network device at the time t3 between the time t1 and the time t2, and instructs the terminal device to switch from being based on the first SSSG to being based on the second SSSG to monitor the PDCCH, the terminal device immediately performs the SSSG switching at the time t 3. Correspondingly, the terminal equipment does not need to execute SSSG switching at the time t2, and continues to monitor the PDCCH by using the second SSSG.

According to the communication method provided by the embodiment of the application, the terminal equipment sends the first message to the network equipment at the first moment. If the condition triggering the search space set grouping switching comprises a first message, and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at a second moment, the terminal equipment switches from monitoring the physical downlink control channel based on the first search space set grouping to monitoring the physical downlink control channel based on the second search space set grouping. In this way, in a communication system with a larger transmission delay such as an NTN network, when the terminal device sends a message to the network device, which can trigger the switching of the search space set packet, the switching of the search space set packet is performed at a second time after the first time of sending the message, so as to ensure that the terminal device and the network device understand the used search space set packet consistently in a period from the time when the terminal device sends the message to the time when the network device receives the message.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program information, and the above program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.

Fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus may be implemented by software, hardware, or a combination of both to perform the communication method at the terminal device side in the above embodiment. As shown in fig. 13, the communication apparatus 600 includes: a transmitting module 601 and a processing module 602.

A sending module 601, configured to send a first message to a network device at a first moment;

the processing module 602 is configured to switch from the first search space set group to the second search space set group to monitor the physical downlink control channel if the search space set group switch is triggered and the communication device monitors the physical downlink control channel based on the first search space set group at the second time.

In an alternative embodiment, the second set of search space packets correspond to a physical downlink control channel having denser listening opportunities than the first set of search space packets.

In an alternative embodiment, the first message comprises a scheduling request.

In an alternative embodiment, the random access request comprises a first message of a four-step random access or a second message of a two-step random access.

In an alternative embodiment, the second moment is determined based on the first moment and the target time offset, or based on a timer started at the first moment.

In an alternative embodiment, the time offset is determined according to round trip delay of the communication device and the network device, or is determined according to an uplink timing advance of the communication device, or is determined according to configuration information sent by the network device, or is preset information of the terminal device.

The communication device provided by the embodiment of the present application may perform the actions of the communication method at the terminal device side in the above embodiment, and its implementation principle and technical effects are similar, and are not described herein again.

Fig. 14 is a schematic structural diagram of another communication device according to an embodiment of the present application. The communication apparatus may be implemented by software, hardware, or a combination of both to perform the communication method on the network device side in the above embodiment. As shown in fig. 14, the communication apparatus 700 includes: a receiving module 701 and a transmitting module 702.

A receiving module 701, configured to receive a first message sent by a terminal device at a first time, where the first message triggers a search space set packet switching, where the search space set packet switching is used to switch the terminal device from being based on the first search space set packet to being based on the second search space set packet to monitor a physical downlink control channel.

And the sending module 702 is configured to send response information to the terminal device on the physical downlink control channel.

In an alternative embodiment, the first message comprises a scheduling request.

In an alternative embodiment, the time offset is determined according to round trip delay of the terminal device and the communication device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the communication device, or is preset information of the terminal device.

The communication device provided in the embodiment of the present application may perform the actions of the communication method on the network device side in the above embodiment, and its implementation principle and technical effects are similar, and are not described herein again.

Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 15, the electronic device may include: a processor 81 (e.g., a CPU), a memory 82, a receiver 83, and a transmitter 84; the receiver 83 and the transmitter 84 are coupled to the processor 81, the processor 81 controlling the receiving action of the receiver 83, the processor 81 controlling the transmitting action of the transmitter 84. The memory 82 may comprise a high-speed RAM memory or may further comprise a non-volatile memory NVM, such as at least one magnetic disk memory, in which various information may be stored in the memory 82 for performing various processing functions and implementing method steps of embodiments of the application. Optionally, the electronic device according to the embodiment of the present application may further include: a power supply 85, a communication bus 86, and a communication port 88. The receiver 83 and the transmitter 84 may be integrated in a transceiver of the electronic device or may be separate transceiver antennas on the electronic device. The communication bus 86 is used to enable communication connections between the components. The communication port 88 is used to enable connection communication between the electronic device and other peripheral devices.

In the embodiment of the present application, the memory 82 is configured to store computer executable program codes, and the program codes include information; when the processor 81 executes the information, the information causes the processor 81 to execute the processing action on the terminal device side in the above method embodiment, causes the transmitter 84 to execute the transmitting action on the terminal device side in the above method embodiment, and causes the receiver 83 to execute the receiving action on the terminal device side in the above method embodiment, so that the implementation principle and technical effects are similar, and are not repeated here.

Or, when the processor 81 executes the information, the information causes the processor 81 to execute the processing action on the network device side in the above method embodiment, causes the transmitter 84 to execute the sending action on the network device side in the above method embodiment, and causes the receiver 83 to execute the receiving action on the network device side in the above method embodiment, so that the implementation principle and technical effects are similar, and are not repeated herein.

The embodiment of the application also provides a communication system which comprises the terminal equipment and the network equipment so as to execute the communication method.

The embodiment of the application also provides a chip which comprises a processor and an interface. Wherein the interface is used for inputting and outputting data or instructions processed by the processor. The processor is configured to perform the methods provided in the method embodiments above. The chip can be applied to terminal equipment or network equipment.

The present application also provides a computer-readable storage medium, which may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes, and specifically, the computer-readable storage medium stores therein program information for use in the above communication method.

The embodiment of the present application also provides a program for executing the communication method provided by the above method embodiment when executed by a processor.

The present application also provides a program product, such as a computer-readable storage medium, having instructions stored therein, which when run on a computer, cause the computer to perform the communication method provided by the above-described method embodiments.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices such as servers, data centers, etc. that contain an integration of one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

A method of communication, comprising:

the terminal equipment sends a first message to the network equipment at a first moment;

and if the search space set grouping switching is triggered and the terminal equipment monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal equipment switches from the first search space set grouping to the second search space set grouping based on the physical downlink control channel.
The method of claim 1, wherein the second set of search space packets correspond to physical downlink control channels having denser listening opportunities than the first set of search space packets.
The method of claim 1, wherein the first message comprises a scheduling request.
A method according to claim 3, characterized in that the first message is in a waiting state at the second moment.
The method of claim 1, wherein the first message comprises a random access request.
The method of claim 5, wherein the random access request comprises message 1 of a four-step random access or message a of a two-step random access.
The method of any of claims 1-6, wherein the first and second groupings of search space sets are determined based on configuration information of the network device.
The method according to any of claims 1-6, wherein the second moment in time is determined from the first moment in time and a target time offset or from a timer started at the first moment in time.
The method of claim 8, wherein the time offset is determined according to round trip delay of the terminal device and the network device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the network device, or is preset information of the terminal device.
The method of claim 9, wherein the configuration information is carried on broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.
A method of communication, comprising:

the network equipment receives a first message sent by the terminal equipment at a first moment, wherein the first message triggers search space set grouping switching, and the search space set grouping switching is used for switching the terminal equipment from being based on the first search space set grouping to being based on the second search space set grouping to monitor a physical downlink control channel;

and the network equipment sends response information to the terminal equipment in the physical downlink control channel.
The method of claim 11, wherein the second set of search space packets correspond to physical downlink control channels having denser listening opportunities than the first set of search space packets.
The method of claim 11, wherein the first message comprises a scheduling request.
The method of claim 11, wherein the first message comprises a random access request.
The method of claim 14, wherein the random access request comprises message 1 of a four-step random access or message a of a two-step random access.
The method of any of claims 11-15, wherein the first and second groupings of search space sets are determined based on configuration information of the network device.
The method of claim 11, wherein the first message is in a waiting state at a second time.
The method of claim 17, wherein the second time is determined from the first time and a target time offset or from a timer started at the first time.
The method according to claim 18, wherein the time offset is determined according to round trip delay of the terminal device and the network device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the network device, or is preset information of the terminal device.
The method of claim 19, wherein the configuration information is carried on broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.
A communication device, comprising:

a sending module, configured to send a first message to a network device at a first moment;

and the processing module is used for switching from the first search space set group to the second search space set group to monitor the physical downlink control channel if the search space set group switching is triggered and the communication device monitors the physical downlink control channel based on the first search space set group at the second moment.
The apparatus of claim 21, wherein the second set of search space packets correspond to physical downlink control channels having denser listening opportunities than the first set of search space packets.
The apparatus of claim 21, wherein the first message comprises a scheduling request.
The apparatus of claim 23, wherein the first message is in a waiting state at the second time.
The apparatus of claim 21, wherein the first message comprises a random access request.
The apparatus of claim 25, wherein the random access request comprises message 1 of a four-step random access or message a of a two-step random access.
The apparatus of any of claims 21-26, wherein the first and second groupings of search space sets are determined based on configuration information of the network device.
The apparatus of any of claims 21-26, wherein the second time instant is determined from the first time instant and a target time offset or from a timer started at the first time instant.
The apparatus of claim 28, wherein the time offset is determined according to round trip delays of the communication apparatus and the network device, or is determined according to an uplink timing advance of the communication apparatus, or is determined according to configuration information sent by the network device, or is preset information of the communication apparatus.
The apparatus of claim 29, wherein the configuration information is carried on broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.
A communication device, comprising:

the receiving module is used for receiving a first message sent by the terminal equipment at a first moment, the first message triggers a search space set group, and the search space set group switching is used for switching the terminal equipment from being based on the first search space set group to being based on a second search space set group to monitor a physical downlink control channel;

And the sending module is used for sending response information to the terminal equipment in the physical downlink control channel.
The apparatus of claim 31, wherein the second set of search space packets correspond to physical downlink control channels having denser listening opportunities than the first set of search space packets.
The apparatus of claim 31, wherein the first message comprises a scheduling request.
The apparatus of claim 31, wherein the first message comprises a random access request.
The apparatus of claim 34, wherein the random access request comprises message 1 of a four-step random access or message a of a two-step random access.
The apparatus of any of claims 31-35, wherein the first and second groupings of search space sets are determined based on configuration information of the communication apparatus.
The apparatus of claim 31, wherein the first message is in a waiting state at a second time.
The apparatus of claim 37, wherein the second time is determined based on the first time and a target time offset or based on a timer started at the first time.
The apparatus of claim 38, wherein the time offset is determined according to round trip delay of the terminal device and the communication device, or is determined according to an uplink timing advance of the terminal device, or is determined according to configuration information sent by the communication device, or is preset information of the terminal device.
The apparatus of claim 39, wherein the configuration information is carried on broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.
A terminal device, comprising:

a processor, a memory, a receiver, and an interface to communicate with a network device;

the memory stores computer-executable instructions;

the processor executing computer-executable instructions stored in the memory, causing the processor to perform the communication method of any one of claims 1 to 10.
A network device, comprising:

a processor, a memory, a transmitter, and an interface for communicating with a terminal device;

the memory stores computer-executable instructions;

the processor executing computer-executable instructions stored in the memory causing the processor to perform the communication method of any one of claims 11 to 20.
A computer program product comprising computer instructions which, when executed by a processor, implement the communication method of any of claims 1-20.
A computer-readable storage medium, in which computer-executable instructions are stored, which when executed by a processor are adapted to implement the communication method of any one of claims 1 to 20.