WO2023050318A1

WO2023050318A1 - Random access method, communication apparatus and communication device

Info

Publication number: WO2023050318A1
Application number: PCT/CN2021/122195
Authority: WO
Inventors: 朱亚军
Original assignee: 北京小米移动软件有限公司
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2023-04-06
Also published as: CN116584129A

Abstract

Provided in embodiments of the present disclosure are a random access method, a communication apparatus and a communication device. The random access method can be applied to a fusion system of 5G communication and satellite communication. The method may comprise: a terminal device receives a DCI sent by a network device, where the DCI comprises first indication information, and the first indication information is used for instructing the terminal device to perform random access; the terminal device determines that ephemeris information is updated; and the terminal device delays the random access on a PRACH according to a first timing offset and a second timing offset, where the first timing offset is a round-trip delay between the terminal device and a predetermined reference point, and the second timing offset is a duration for which the terminal device delays the random access on the PRACH. In the present disclosure, when the terminal device determines that the ephemeris information is updated, the terminal device delays the random access according to the first timing offset and the second timing offset, thereby improving the reliability of the random access.

Description

A random access method, communication device and communication equipment

technical field

The present disclosure relates to the technical field of wireless communication, and in particular, to a random access method, a communication device, and a communication device.

Background technique

With the development of information technology, more urgent requirements are put forward for the efficiency, mobility and diversity of communication. At present, a development focus in the field of communication systems is global mobile communication, and an important part of global mobile communication is satellite communication. The third generation partnership project (3rd generation partnership project, 3GPP) standards organization has released the fifth generation mobile network (5th generation mobile networks, 5G) technical standards to study air-space-ground integrated communication technology, mainly to integrate existing 5G standard and satellite communication technology meet the full coverage on a global scale.

In a communication system integrating 5G communication and satellite communication, how to improve the reliability of random access is an urgent problem to be solved.

Contents of the invention

The present disclosure provides a random access method, communication device and communication equipment, so as to improve the reliability of random access in a communication system integrating 5G communication and satellite communication.

According to the first aspect of the present disclosure, a random access method is provided, which can be applied to a terminal device in a communication system where terrestrial communication and satellite communication are integrated. The communication system may also be called a non-terrestrial network (non-terrestrial network, NTN) communication system. The method may include: the terminal device receives downlink control information sent by the network device, the downlink control information may include first indication information, and the first indication information is used to instruct the terminal device to perform random access; the terminal device determines to update the ephemeris information; the terminal device Perform delayed random access on the physical random access channel according to the first timing offset and the second timing offset.

In the present disclosure, the first timing offset is the round-trip delay from the terminal device to the predetermined reference point, and the second timing offset is the delay time for the terminal device to perform random access on the physical random access channel.

Here, the predetermined reference point can be understood as any point on the wireless communication link in the NTN system, such as any point on the service link (service link) between the satellite and the terminal, or the feeder line between the satellite and the ground network equipment Any point on the feeder link. Exemplarily, the above-mentioned predetermined reference point may be any access network device on the service link in the NTN communication system, such as a satellite, an NTN gateway, a ground base station, etc.; or, the predetermined reference point may also be any An access network device, such as satellite, NTN gateway, ground base station, etc.

In some possible implementation manners, the terminal device determining to update the ephemeris information includes: the terminal device determining that the valid timer expires; the terminal device determining to update the ephemeris information.

In some possible implementation manners, the terminal device receiving the downlink control information sent by the network device includes: the terminal device receives the downlink control information on an nth time slot in the downlink time domain resource, where n is a positive integer.

In some possible implementation manners, the terminal device delays the access on the physical random access channel according to the first timing offset and the second timing offset, including: After the time slot is delayed by a first duration, random access is performed on the next physical random access channel transmission opportunity, where the first duration is the sum of the first timing offset and the second timing offset.

In some possible implementation manners, the downlink control channel further includes second indication information, where the second indication information is used to indicate the second timing offset.

In some possible implementation manners, the above method further includes: the terminal device receives the system information within the second duration corresponding to the second timing offset; the terminal device determines the ephemeris information according to the system information; the terminal device determines the ephemeris information according to the determined ephemeris information to determine the first timing offset.

According to the second aspect of the present disclosure, a random access method is provided, which can be applied to a network device in a communication system where terrestrial communication and satellite communication are integrated. This communication system may also be referred to as an NTN communication system. The above method includes: the network device determines that the terminal device updates ephemeris information; the network device sends downlink control information to the terminal device, the downlink control information includes first indication information, and the first indication information is used to instruct the terminal equipment to perform random access.

In some possible implementation manners, the network device determining that the terminal device updates the ephemeris information includes: the network device determining that the valid timer of the terminal device expires; the network device determining that the terminal device updates the ephemeris information.

In some possible implementation manners, the downlink control information further includes second indication information, and the second indication information is used to indicate a second timing offset. The duration of random access.

According to the third aspect of the present disclosure, a communication device is provided. The communication device may be a terminal device in an NTN communication system or a chip or a system-on-a-chip in a terminal device, and may also be a terminal device used to implement the above-mentioned various embodiments. The function module of the method. The communication device can implement the functions performed by the terminal device in the foregoing embodiments, and these functions can be implemented by executing corresponding software through hardware. These hardware or software include one or more modules with corresponding functions mentioned above. The device may include: a receiving module, configured to receive downlink control information sent by the network device, the downlink control information includes first indication information, and the first indication information is used to instruct the terminal device to perform random access; a processing module, configured to determine the update satellite History information; a sending module, configured to perform delayed random access on the physical random access channel according to the first timing offset and the second timing offset, wherein the first timing offset is the terminal equipment to the predetermined reference The round-trip delay of the point, and the second timing offset is the length of time the terminal device delays performing random access on the physical random access channel.

In some possible implementation manners, the processing module is specifically configured to determine that the valid timer expires; and determine to update the ephemeris information.

In some possible implementation manners, the receiving module is configured to receive downlink control information on the nth time slot in the downlink time domain resource, where n is a positive integer.

In some possible implementations, the sending module is configured to perform random access on the next physical random access channel sending opportunity after delaying for a first duration from the nth time slot in the uplink time domain resource, wherein the A duration is the sum of the first timing offset and the second timing offset.

In some possible implementation manners, the downlink control information further includes second indication information, where the second indication information is used to indicate the second timing offset.

In some possible implementations, the receiving module is further configured to receive system information within the second duration corresponding to the second timing offset; the first processing module is further configured to determine ephemeris information according to the system information; The ephemeris information is used to determine the first timing offset.

According to the fourth aspect of the present disclosure, a communication device is provided. The communication device may be a network device in an NTN communication system or a chip or a system-on-chip in a network device, and may also be a network device used to implement the above-mentioned various embodiments. The function module of the method. The communication device can realize the functions performed by the network equipment in the above-mentioned embodiments, and these functions can be realized by executing corresponding software through hardware. These hardware or software include one or more modules with corresponding functions mentioned above. The apparatus may include: a processing module, configured to determine that the terminal device updates ephemeris information; a sending module, configured to send downlink control information to the terminal device, where the downlink control information includes first indication information, and the first indication information is used to instruct the terminal device to perform random access.

In some possible implementation manners, the processing module is specifically configured to determine that the effective timer of the terminal device has expired; and determine that the terminal device updates the ephemeris information.

According to a fifth aspect of the present disclosure, there is provided a terminal device, including: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored in the memory, so as to implement the above-mentioned first aspect and its The random access method described in any possible implementation manner.

According to a sixth aspect of the present disclosure, there is provided a network device, including: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored in the memory, so as to implement the above-mentioned second aspect and its The random access method described in any possible implementation manner.

According to the seventh aspect of the present disclosure, there is provided a computer-readable storage medium, and instructions are stored in the computer-readable storage medium; when the instructions are run on a computer, they are used to perform the above-mentioned first to second aspects and any possible The random access method described in the implementation manner.

According to the eighth aspect of the present disclosure, there is provided a computer program or a computer program product. When the computer program product is executed on a computer, the computer can realize the random access method.

In the present disclosure, when the terminal device determines to update the ephemeris information, the random access is delayed according to the first timing offset and the second timing offset, which can well compensate the uplink and downlink frame timing of the terminal device, thereby Ensure the reliable transmission of the preamble sequence, thereby improving the reliability of random access. Further, it is also possible to reduce blind detection without comparison by network devices.

It should be understood that the third to eighth aspects of the present application are consistent with the technical solutions of the first to second aspects of the present application, and the beneficial effects obtained by each aspect and the corresponding feasible implementation manners are similar, so details are not repeated here.

Description of drawings

FIG. 1 is a schematic diagram of an NTN communication system in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another NTN communication system in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a scenario of uplink and downlink alignment on the base station side in an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a scene where uplink and downlink are not aligned on the base station side in an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an implementation flow of the first random access method in an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an implementation flow of a second random access method in an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of an implementation flow of a third random access method in an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of an implementation flow of a fourth random access method in an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of the implementation flow of the fifth random access method in the implementation of the present disclosure;

FIG. 10 is a schematic diagram of an implementation flow of a sixth random access method in an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of an implementation flow of a seventh random access method in an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a communication device in an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of another communication device in an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a communication device in an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a terminal device in an embodiment of the present disclosure;

Fig. 16 is a schematic structural diagram of a network device in an embodiment of the present disclosure.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the disclosed embodiments as recited in the appended claims.

Terms used in the embodiments of the present disclosure are for the purpose of describing specific embodiments only, and are not intended to limit the embodiments of the present disclosure. As used in the examples of this disclosure and the appended claims, the singular forms "a" and "the" are also intended to include the plural unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the embodiments of the present disclosure may use the terms "first", "second", "third" and the like to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, "first information" may also be called "second information" without departing from the scope of the embodiments of the present disclosure, and similarly, "second information" may also be called "first information". Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination."

The technical solutions of the embodiments of the present disclosure are applicable to a communication system in which terrestrial communication and satellite communication are integrated. The communication system may also be called a non-terrestrial network (non-terrestrial network, NTN) communication system. Exemplarily, the ground communication system may be a long term evolution (long term evolution, LTE) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a 5G communication system or a new radio (new radio, NR) system, future next generation The mobile communication system and the like are not specifically limited in this embodiment of the present disclosure. Optionally, in the embodiments of the present disclosure, an NTN communication system integrating 5G communication and satellite communication is taken as an example for illustration.

In wireless communication technology, satellite communication is considered to be an important aspect in the development of future wireless communication technology. Satellite communication refers to the communication carried out by radio communication equipment on the ground using satellites as relays. The satellite communication system consists of a satellite part and a ground part. The characteristics of satellite communication are: large communication range; communication between any two points can be carried out as long as they are within the range covered by the radio waves emitted by the satellite; it is not easily affected by land disasters and has high reliability.

As a supplement to the ground communication system, satellite communication has the following characteristics: 1. Coverage can be extended: For areas where the cellular communication system cannot cover or the coverage cost is high, such as oceans, deserts and remote mountainous areas, satellite communication can be used to solve the problem. communication problem. 2. Emergency communication: Under the condition that the infrastructure of cellular communication is unavailable due to the extreme situation of disaster (such as earthquake, etc.), the use of satellite communication can quickly establish a communication connection. 3. Provide industry applications: For example, for delay-sensitive services of long-distance transmission, satellite communication can be used to reduce the delay of service transmission.

Satellite communication can be the communication between radio communication stations on the ground using communication satellites as relay stations to forward radio waves. The communication functions of communication satellites can include: receiving signals, changing the frequency of signals, amplifying signals, forwarding signals and positioning.

In some possible implementations, FIG. 1 is a schematic diagram of an NTN communication system in an embodiment of the present disclosure. Referring to FIG. 1, the communication system includes: a terminal device 10, a satellite 20, and an NTN gateway 30 (also called ground station, gateway station or gateway station), core network equipment 40 and data network 50. At this time, the NTN communication network is in transparent transmission mode. Wherein, the satellite 20 carries a payload having the functions of the entire access network equipment. The terminal device 10 can be connected to an access network device 20 (such as a satellite 20) through a 5G new air interface (such as a Uu interface), and the satellite 20 can be connected to the NTN gateway 30 through an interface (such as a satellite radio interface (SRI)), The NTN gateway 30 is connected to the core network device 40 through a wireless link interface (such as an NG interface), and the core network device 40 is connected to the data network 50 through an interface (such as an N6 interface). The access network equipment establishes a wireless feeder link (feeder link) through the ground NTN gateway and the core network equipment.

In some other possible implementation manners, FIG. 2 is a schematic diagram of another NTN communication system in an embodiment of the present disclosure. Referring to FIG. 2, when the access network device adopts a centralized unit (centralized unit, CU) and distributed In the distributed unit (DU) architecture (ie CU-DU architecture), the DU is carried on the satellite 20 (it can be understood that the payload carried by the satellite 20 is DU), and the CU is deployed on the ground base station 60 (such as gNB) superior. The satellite 20 and the NTN gateway 30 form a remote radio unit (remote radio unit, RRU), and the satellite 20, the NTN gateway 30 and the ground base station 60 form a next-generation wireless access network. At this time, the NTN communication network is in regenerative mode. The terminal device 10 and the satellite 20 are connected through a new air interface (such as a Uu interface), the satellite 20 and the NTN gateway 30 communicate through an interface (such as SRI), and the ground base station 60 and the core network device 40 are connected through a wireless link interface ( Such as NG interface) communication, the core network device 40 communicates with the data network 50 through an interface (such as N6 interface). In this way, the DU in the air establishes a wireless feeder link with the CU through the NTN gateway on the ground.

Exemplarily, the above-mentioned satellite 20 may be a geostationary orbit (geostationary orbit, GSO) satellite, or a non-geostationary orbit (non-geostationary orbit, NGSO) medium earth orbit (MEO) satellite or a low earth orbit (low earth orbit) , LEO) satellites, or high altitude platform Station (HAPS) etc.

It should be noted that the satellite 20 in FIG. 1 and FIG. 2 can be replaced by other airborne platforms whose orbits are determined, such as drones, hot air balloons, and airplanes. Of course, in some possible embodiments, the satellite 20 may also be replaced by other ground platforms with determined orbits, such as buses and ships with determined orbits, which are not specifically limited in this embodiment of the present disclosure.

In the embodiment of the present disclosure, the NTN gateway 30 may be a transport network layer (transport Network layer, TNL) node for realizing transparent transmission of data or signaling; the NTN gateway may also be replaced by a fixed receiving node ( node) or a donor node.

It should be understood that FIG. 1 and FIG. 2 are only examples, and the technical solutions of the embodiments of the present disclosure may also be applied to other NTN communication systems, which are not specifically limited in the embodiments of the present disclosure.

In the embodiment of the present disclosure, the terminal device 10 may also be called: user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device, etc.

It can be understood that the terminal device 10 may be a device that provides voice/data connectivity to users, for example, a handheld device or a vehicle-mounted device with a wireless connection function. Exemplarily, some examples of terminals are: mobile phone (mobile phone), tablet computer, notebook computer, palmtop computer, mobile internet device (mobile internet device, MID), wearable device, virtual reality (virtual reality, VR) device, Augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in auto-driving, wireless terminals in remote medical surgery, smart grid ), wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, cellular phones, cordless phones, session initiation protocol (session initiation protocol (SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, The embodiment of the present disclosure does not specifically limit the vehicle-mounted device, the wearable device, the terminal device in the 5G network, or the terminal device in the evolved public land mobile network (PLMN).

It can be understood that the network device in the embodiment of the present disclosure may be an access network device used for communicating with a terminal device. Network devices are mainly used to provide wireless access services, configure wireless resources, and provide reliable wireless transmission protocols and data encryption protocols for terminal devices. Network equipment can also be called access equipment or wireless access network equipment, which can be an evolved base station (evolved nodeB, eNB or eNodeB) in the LTE system, or a cloud radio access network (cloud radio access network, CRAN) The wireless controller in the system; or, the network device can also be a relay station, an access point, a vehicle device, a wearable device, and an access network device in a 5G network or a network device in a future evolved PLMN network. Exemplarily, the network device may be an access point (access point, AP) in a wireless local area network (wireless local area networks, WLAN), or may be a gNB in an NR system, which is not specifically limited in this embodiment of the present disclosure. .

In addition, in the embodiment of the present disclosure, the network device is a device in a radio access network (radio access network, RAN), or in other words, a RAN node that connects a terminal device to a wireless network. Exemplarily, some examples of network equipment are: gNB, transmission reception point (transmission reception point, TRP), evolved node B (evolved node B, eNB), radio network controller (radio network controller, RNC), node B (node B, NB), base station controller (basestation controller, BSC), base transceiver station (base transceiver station, BTS), home base station ((home evolved node B, HeNB) or (home node B, HNB)), baseband unit (base band unit, BBU), wireless fidelity (wireless fidelity, Wifi) access point (access point, AP), etc. In a network structure, the network device may include CU, DU, RAN device including CU and DU, CU of control plane (control plane, CP) (such as CU-CP) and CU of user plane (ueser plane, UP) (such as CU-UP) and RAN equipment of DU.

In an embodiment of the present disclosure, the propagation delay in the NTN system is much longer than that in the ground mobile system, ranging from a few milliseconds to several ranging from hundreds of milliseconds. Therefore, in the NTN system, terminal equipment (such as UE) needs to apply a large timing advance (timing advance, TA) value, but it will cause its downlink (downlink, DL) and uplink (uplink, UL) frame timing to appear relatively large. offset. Figure 3 shows a scenario where the UE applies a large TA and the DL and UL frame timing of the network device (eg gNB) is aligned. Figure 4 shows another scenario where no alignment is required between the gNB's DL and UL frames. The UE applies a UE-specific TA (UE-specific TA) to align DL and UL frame timing at a predetermined reference point. However, for the scenario shown in FIG. 4 , additional complexity is required on the network device side to manage the corresponding scheduling sequence of the scenario. As such, various timing relationships need to be enhanced to cope with large offsets in the UE's DL and UL frame timing.

In a possible implementation manner, the foregoing enhancement may include introducing a first timing offset, and applying the first timing offset to compensate for transmission delay. Here, the first timing offset may be understood as a round trip delay (round trip time, RTT) between the UE and a predetermined reference point, such as Koffset. Here, the predetermined reference point can be understood as any point on the wireless communication link in the NTN system, such as any point on the service link (service link) between the satellite and the terminal, or the feeder line between the satellite and the ground network equipment Any point on a feeder link. Exemplarily, the aforementioned predetermined reference point can be any access network device on the service link in the NTN communication system, such as a satellite, NTN gateway, ground base station, etc.; or, the predetermined reference point can also be an access network device on the feeder link Any access network equipment, such as satellites, NTN gateways, ground base stations, etc.

It should be noted that the above-mentioned uplink and downlink timing relationship may include: downlink control information (downlink control information, DCI) scheduling physical uplink shared channel (physical uplink share channel, PUSCH) transmission timing, random access response authorization (radom access response grant, RAR grant) scheduling PUSCH transmission timing, physical uplink control channel (physical uplink control channel, PUCCH) hybrid automatic repeat request acknowledgment message (hybrid automatic repeat request acknowledgment character, HARQ-ACK) transmission timing, media access Incoming control-control unit (medium access control control element, MAC CE) action timing, channel state information (channel state information, CSI) reference resource timing, aperiodic sounding reference signal (sounding reference symbol, SRS) transmission timing, etc. .

In the embodiment of the present disclosure, in the process of communication between the network device and the terminal device, if the network device finds that the terminal device is out of sync, it can send a physical downlink control channel order (PDCCH order) to the terminal device , to trigger the terminal device to initiate random access, so as to re-establish uplink synchronization. That is to say, if the network device determines that the uplink of the terminal device is out of sync, the network device can trigger the transmission of a physical random access channel (PRACH) by sending DCI (also known as PDCCH) to the terminal device.

However, in the above-mentioned NTN system, due to the large difference in the communication distance between the terminal device and the satellite, between the terminal device and the NTN gateway, or between the terminal device and the ground base station due to the operating speed and height of the satellite, the terminal There is a large difference in the transmission delay between the device and the satellite, between the terminal device and the NTN gateway, or between the terminal device and the ground base station. Then, if the terminal device wants to re-establish uplink synchronization after uplink out-of-sync, it needs to determine whether the received ephemeris information is valid. Only when the ephemeris information is valid, can the terminal device determine the accurate first timing offset, thereby ensuring the reliability of random access. It can be seen that if all terminal devices are delayed only by the first timing offset without distinction, the reliable transmission of the preamble cannot be guaranteed, thereby affecting the reliability of random access of the terminal devices.

In order to solve the above problems, an embodiment of the present disclosure provides a random access method, and the random access method may be applied to the NTN communication system described in one or more embodiments above.

The random access method provided by the embodiments of the present disclosure will be described below in conjunction with the above-mentioned NTN communication system.

In the embodiment of the present disclosure, the network device may be an access network device such as a ground base station (such as gNB) and a satellite in the above-mentioned NTN communication system.

FIG. 5 is a schematic diagram of the implementation flow of the first random access method in an embodiment of the present disclosure. Referring to FIG. 5, the random access method may include:

S501. The network device sends DCI to the terminal device.

Wherein, the DCI may include first indication information, and the first indication information is used to instruct the terminal device to initiate a random access to re-establish uplink synchronization when the uplink is out of synchronization.

Exemplarily, the foregoing first indication information may be a PDCCH order.

S502, the terminal device responds to the DCI, and determines whether to update the ephemeris information.

In a possible implementation manner, in S502, the terminal device may determine whether to update the ephemeris information by itself by judging whether a validation timer (validation timer) set by itself expires. Wherein, if the effective timer expires, it means that the current ephemeris information has become invalid. At this time, the terminal device determines to update the ephemeris information and executes S503; otherwise, if the effective timer does not expire, it means that the current ephemeris information is still If valid, at this time, the terminal device determines not to update the ephemeris information, and executes S504.

S503. The terminal device delays random access on the PRACH according to the first timing offset and the second timing offset.

Here, the second timing offset is used to indicate the length of time that the terminal device delays performing random access. The time unit of the second timing offset may be absolute time or logical time, such as several time slots (slots).

It should be understood that after the terminal device determines to update the ephemeris information, it may first obtain the first timing offset and the second timing offset. Then, the terminal device delays sending the preamble sequence on the available PRACH according to the sum of the first timing offset and the second timing offset, so as to implement delayed random access. Here, the available PRACH can be understood as the next PRACH transmission opportunity (occasion).

In a possible implementation manner, the second timing offset may be determined in but not limited to the following two manners.

In a first manner, the second timing offset may be specified by a communication protocol.

Wherein, the above-mentioned communication protocols may include various versions of wireless communication protocols of the 3rd generation partnership project (3rd generation partnership project, 3GPP) and their evolution versions.

It can be understood that the communication protocol may specify one or more timing offsets. Then, after receiving the DCI in S501, the terminal device determines the second timing offset from one or more timing offsets in response to the DCI.

In a second manner, the second timing offset may be indicated by the network device.

It can be understood that the network device may preconfigure one or more timing offsets, and determine one timing offset for the terminal device as the second timing offset. The foregoing DCI may further include second indication information for indicating the second timing offset. The terminal device may determine the second timing offset according to the second indication information.

In another embodiment, the second indication information may also be carried by other DCI.

Exemplarily, the mapping relationship between the second indication information and the second timing offset (which may be recorded as offset 2) may be, but is not limited to, as shown in Table 1 below.

Table 1

第二指示信息Second instruction message	offset 2数值offset 2 value
0000	11
0101	22
1010	33
1111	44

Of course, in practical applications, there may be other values for the second indication information and the second timing offset, which are not specifically limited in this embodiment of the present disclosure.

Of course, the terminal device may also determine the second timing offset in other ways such as negotiating with the network device, which is not specifically limited in this embodiment of the present disclosure.

In some possible implementation manners, an information field is set in the DCI, and the information field is used to carry the above-mentioned second indication information. Wherein, the above information field may be located at a pre-configured position in the DCI, or may be located at a fixed position. Further, the length of the information field may be fixed or configurable. In an implementation example, the length of the information field may be determined by the number of values to be indicated by the second indication information. For example, offset 2 may have 4 values, then the length of the information field may be 2 bits. Alternatively, offset 2 may have 8 values, then the length of the information field may be 3 bits.

In some possible implementation manners, the terminal device may also obtain the first timing offset in the following manner: the terminal device receives the system information within the duration A (ie, the second duration) corresponding to the second timing offset. Then, the terminal device determines the ephemeris information according to the system information, so as to obtain valid ephemeris information. Finally, the terminal device determines the first timing offset according to the determined ephemeris information. The first timing offset thus determined is more accurate. Exemplarily, the above system information may be a master information block (master information block, MIB), a system information block (system information block, SIB)) and so on.

S504. The terminal device delays random access on the PRACH according to the first timing offset.

It should be understood that after the terminal device determines not to update the ephemeris information, it may first obtain the first timing offset. Then, according to the first timing offset, sending the preamble sequence on the available PRACH is delayed, so as to implement delayed random access.

In some possible embodiments, when the terminal device determines not to update the ephemeris information, for example, the valid timer has not expired, the value of the second timing offset can also be 0, a null value or other invalid values. Specific limits.

In some possible implementation manners, obtaining the first timing offset by the terminal device in S504 may be: the terminal device determines the first timing offset according to the current ephemeris information.

It can be understood that through S501, the terminal device can receive the DCI on the nth time slot (such as downlink slot n) of the downlink time domain resource, where n is a positive integer. Correspondingly, in S503, the terminal device may delay the duration B (that is, the first duration, such as the first timing offset and the second timing offset) from the nth time slot (such as uplink slot n) of the uplink time domain resource After that, delay sending the preamble sequence on the next PRACH sending opportunity (PRACH occasion) to perform random access. Exemplarily, the first timing offset is Koffset, and the second timing offset is offset2. Then, the terminal device can determine that the next PRACH occasion is after the uplink slot n+Koffset+offset2. Alternatively, in S504, the terminal device may delay the time length C (ie, the third time length, such as the first timing offset) from the nth time slot (such as uplink slot n) of the uplink time domain resource, and then on the next PRACH occasion Delay sending the preamble sequence to perform random access. Exemplarily, the first timing offset is Koffset. Then, the terminal device can determine that the next PRACH occasion is after the uplink slot n+Koffset.

In the embodiment of the present disclosure, when the terminal device determines to update the ephemeris information, the random access is delayed according to the first timing offset and the second timing offset, which can well compensate the uplink and downlink frame timing of the terminal device , so as to ensure the reliable transmission of the preamble sequence, thereby improving the reliability of random access. Further, it is also possible to reduce blind detection without comparison by network devices.

In some possible embodiments, the embodiments of the present disclosure further provide a random access method. FIG. 6 is a schematic diagram of an implementation flow of a second random access method in an embodiment of the present disclosure. Referring to FIG. 6, the random access method may include:

S601. The network device sends DCI to the terminal device.

S602. The terminal device determines to update the ephemeris information.

In a possible implementation manner, the terminal device may determine to update the ephemeris information by judging that the valid timer set by itself expires, and then execute S603.

S603. The terminal device delays random access on the PRACH according to the first timing offset and the second timing offset.

It should be noted that, for the specific implementation process of S601 to S603 above, reference may be made to the description of S501 to S503 in the embodiment of FIG. 5 , which will not be repeated here.

In some possible embodiments, the embodiments of the present disclosure further provide a random access method. FIG. 7 is a schematic diagram of the implementation process of the third random access method in the embodiment of the present disclosure. Referring to FIG. 7, the random access method may include:

S701. The network device sends DCI to the terminal device.

S702. The terminal device determines not to update the ephemeris information.

In a possible implementation manner, the terminal device may determine not to update the ephemeris information by judging that the valid timer set by itself has not expired, and then execute S703.

S703. The terminal device delays random access on the PRACH according to the first timing offset.

It should be noted that, for the specific implementation process of S701 to S703 above, reference may be made to the description of S501, S502, and S504 in the embodiment of FIG. 5 , which will not be repeated here.

Based on the same inventive concept, the embodiments of the present disclosure also provide a random access method. FIG. 8 is a schematic diagram of the implementation process of the fourth random access method in the embodiment of the present disclosure. Referring to FIG. 8, the random access method may include:

S801. The network device determines that the uplink of the terminal device is out of sync.

S802. The network device sends the DCI to the terminal device.

Wherein, the foregoing DCI may include first indication information, and the first indication information is used to instruct the terminal device to perform random access.

Exemplarily, the first indication information may be PDCCH order.

S803, the terminal device responds to the DCI, and delays random access on the PRACH.

It should be understood that, in S803, the terminal device may specifically perform the above S501 to S504, and delay the random access by a time length C or a time length B on the available PRACH, and details are not described here.

In some possible implementation manners, FIG. 9 is a schematic diagram of the implementation flow of the fifth random access method in the implementation of the present disclosure. Referring to FIG. 9, after S801 and before S802, the above method may further include: S901, The network device determines whether the terminal device updates the ephemeris.

In an embodiment, the network device can obtain the duration of the valid timer of the terminal device, then the network device can determine whether the terminal device updates the ephemeris information by judging whether the valid timer of the terminal device expires. Wherein, if the valid timer expires, it means that the current ephemeris information has expired, and at this time, the terminal device updates the ephemeris information; otherwise, if the valid timer does not expire, it means that the current ephemeris information is still valid, and at this time , the terminal device does not update the ephemeris information.

Correspondingly, if the network device determines that the terminal device updates the ephemeris information, the DCI in S802 may further include the second indication information. That is to say, S802 may be: S902, the network device may send DCI carrying the first indication information and the second indication information to the terminal device, so as to instruct the terminal device to initiate random access and indicate the second timing offset to the terminal device . In this way, after receiving the DCI, the terminal device can delay random access on the available PRACH according to the first timing offset and the second timing offset. Exemplarily, the mapping relationship between the second indication signal and the second timing offset may refer to Table 1.

In some possible implementation manners, if the network device determines that the terminal device updates the ephemeris information, the DCI in S802 may not carry the second indication information. In this way, the terminal device can delay access on the available PRACH according to the second timing offset and the first timing offset specified in the communication protocol.

On the contrary, if the network device determines that the terminal device does not update the ephemeris information, the DCI in S802 may only carry the first indication information. That is to say, S802 may be: S903, the network device may send DCI carrying the first indication information to the terminal device, so as to instruct the terminal device to initiate random access. In this way, after receiving the DCI, the terminal device can delay random access on the available PRACH according to the first timing offset.

In some possible implementation manners, if the network device determines that the terminal device does not update the ephemeris information, the DCI in S802 may also carry second indication information. At this time, the second indication information may be 0, a null value or other invalid values. In this way, after receiving the DCI, the terminal device can still delay random access on the available PRACH according to the first timing offset.

It should be noted that, if the DCI includes the second indication information, an information field is set on the DCI, and the information field is used to carry the second indication information. Wherein, the length of the information field can be fixed or configurable.

In the embodiment of the present disclosure, when it is determined that the terminal device updates the ephemeris information, the network device indicates the second timing offset to the terminal device, so that the terminal device can delay random timing according to the first timing offset and the second timing offset. Access, well compensate the uplink and downlink frame timing of the terminal equipment, so as to ensure the reliable transmission of the preamble sequence, thereby improving the reliability of random access. Further, it is also possible to reduce blind detection without comparison by network devices.

In some possible embodiments, the embodiments of the present disclosure further provide a random access method. FIG. 10 is a schematic diagram of an implementation flow of a sixth random access method in an embodiment of the present disclosure. Referring to FIG. 10 , the random access method may include:

S1001. The network device determines that the terminal device updates ephemeris information.

S1002. The network device sends DCI carrying the first indication information and the second indication information to the terminal device.

Wherein, the first indication information is used to instruct the terminal device to perform random access, and the second indication information is used to indicate the second timing offset.

It should be noted that, for the specific implementation process of the above S1001 to S1002, reference may be made to the description of S901 to S902 in the embodiment of FIG. 9 , which will not be repeated here.

In some possible embodiments, the embodiments of the present disclosure further provide a random access method. FIG. 11 is a schematic diagram of the implementation process of the seventh random access method in the embodiment of the present disclosure. Referring to FIG. 11, the random access method may include:

S1101. The network device determines that the terminal device does not update ephemeris information.

S1102. The network device sends DCI carrying only the first indication information to the terminal device.

Wherein, the first indication information is used to instruct the terminal device to perform random access.

It should be noted that, for the specific implementation process of S1101 to S1102 above, reference may be made to the description of S901 and S903 in the embodiment of FIG. 9 , which will not be repeated here.

Based on the same inventive concept, an embodiment of the present disclosure provides a communication device. The communication device may be a terminal device in an NTN communication system or a chip or a system-on-chip in a terminal device, and may also be a The functional modules of the method described in the example. The communication device can implement the functions performed by the terminal device in the foregoing embodiments, and these functions can be implemented by executing corresponding software through hardware. These hardware or software include one or more modules with corresponding functions mentioned above. FIG. 12 is a schematic structural diagram of a communication device in an embodiment of the present disclosure. Referring to FIG. 12 , the communication device 1200 may include: a receiving module 1201 configured to receive DCI sent by a network device, the DCI includes first indication information, and the second The instruction information is used to instruct the terminal device to perform random access; the processing module 1202 is used to determine the update ephemeris information; the sending module 1203 is used to perform the ephemeris information on the PRACH according to the first timing offset and the second timing offset Delayed random access, wherein the first timing offset is a round-trip delay from the terminal device to a predetermined reference point, and the second timing offset is a time length during which the terminal device delays random access on the PRACH.

In some possible implementation manners, the processing module 1202 is specifically configured to determine that the valid timer expires; and determine to update the ephemeris information.

In some possible implementation manners, the receiving module 1201 is configured to receive DCI on the nth time slot in the downlink time domain resource, where n is a positive integer.

In some possible implementation manners, the sending module 1203 is configured to perform random access on the next PRACH occasion after delaying the first duration from the nth time slot in the uplink time domain resource, wherein the first duration is the The sum of a certain timing offset and a second timing offset.

In some possible implementation manners, the DCI further includes second indication information, where the second indication information is used to indicate the second timing offset.

In some possible implementations, the receiving module 1201 is further configured to receive system information within the second duration corresponding to the second timing offset; the processing module 1202 is further configured to determine ephemeris information according to the system information; The ephemeris information is used to determine the first timing offset.

It should be noted that, for the specific implementation process of the receiving module 1201, the processing module 1202 and the sending module 1203, reference may be made to the detailed description of the embodiments in FIG. 5 to FIG.

The receiving module 1201 mentioned in the embodiments of the present disclosure may be a receiving interface, a receiving circuit, or a receiver; the sending module 1203 may be a sending interface, a sending circuit, or a transmitter; and the processing module 1202 may be one or more processors.

Based on the same inventive concept, an embodiment of the present disclosure provides a communication device. The communication device may be a network device in an NTN communication system or a chip or a system on a chip in a network device, and may also be a network device used to implement the above-mentioned implementations. The functional modules of the method described in the example. The communication device can realize the functions performed by the network devices in the above-mentioned embodiments, and these functions can be realized by executing corresponding software through hardware. These hardware or software include one or more modules with corresponding functions mentioned above. 13 is a schematic structural diagram of another communication device in an embodiment of the present disclosure. The communication device 1300 may include: a processing module 1301, configured to determine that the terminal device updates ephemeris information; a sending module 1302, configured to send DCI to the terminal device , the DCI includes first indication information, where the first indication information is used to instruct the terminal device to perform random access.

In some possible implementation manners, the processing module 1301 is specifically configured to determine that the valid timer of the terminal device has expired; and determine that the terminal device updates the ephemeris information.

In some possible implementation manners, the DCI further includes second indication information, where the second indication information is used to indicate a second timing offset, and the second timing offset is a time length for the terminal device to delay performing random access on the PRACH.

It should be noted that, for the specific implementation process of the processing module 1301 and the sending module 1302, reference may be made to the detailed description of the embodiments in FIG. 8 to FIG.

The sending module 1302 mentioned in the embodiments of the present disclosure may be a sending interface, a sending circuit, or a transmitter, etc.; the processing module 1301 may be one or more processors.

Based on the same inventive concept, embodiments of the present disclosure provide a communication device, where the communication device may be the terminal device or the network device described in one or more of the foregoing embodiments. FIG. 14 is a schematic structural diagram of a communication device in an embodiment of the present disclosure. Referring to FIG. 14, the communication device 1400 adopts general-purpose computer hardware, including a processor 1401, a memory 1402, a bus 1403, an input device 1404 and an output Device 1405.

In some possible implementations, memory 1402 may include computer storage media in the form of volatile and/or nonvolatile memory, such as read-only memory and/or random access memory. Memory 1402 may store operating systems, application programs, other program modules, executable code, program data, user data, and the like.

Input devices 1404, such as a keyboard or pointing devices such as a mouse, trackball, touch pad, microphone, joystick, game pad, satellite TV dish, scanner or the like, may be used to enter commands and information into communication devices. These input devices can be connected to the processor 1401 through the bus 1403 .

The output device 1405 can be used for communication equipment to output information. In addition to the monitor, the output device 1405 can also be other peripheral output devices, such as speakers and/or printing devices. These output devices can also be connected to the processor 1401 through the bus 1403. .

The communication device may be connected to a network through the antenna 1406, for example, connected to a local area network (local area network, LAN). In a networked environment, computer-executed instructions stored in the control device may be stored in remote storage devices and are not limited to local storage.

When the processor 1401 in the communication device executes the executable code or application program stored in the memory 1402, the communication device can execute the communication method on the terminal device side or the network device side in the above embodiments. For the specific execution process, refer to the above embodiments. I won't repeat them here.

In addition, the memory 1402 stores computer-executed instructions for realizing the functions of the first receiving module 1201 , the first processing module 1202 and the first sending module 1203 in FIG. 12 . The functions/implementation processes of the first receiving module 1201, the first processing module 1202, and the first sending module 1203 in FIG. 12 can all be realized by calling the computer-executed instructions stored in the memory 1402 by the processor 1401 in FIG. 14. The specific implementation The procedures and functions refer to the above-mentioned related embodiments.

Alternatively, computer execution instructions for implementing the functions of the second processing module 1301 and the second sending module 1302 in FIG. 13 are stored in the memory 1402 . The functions/implementation process of the second processing module 1301 and the second sending module 1302 in FIG. 13 can be realized by calling the computer execution instructions stored in the memory 1402 by the processor 1401 in FIG. Example.

Based on the same inventive concept, embodiments of the present disclosure provide a terminal device, where the terminal device is consistent with the terminal device in one or more embodiments above. Optionally, the terminal device may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

FIG. 15 is a schematic structural diagram of a terminal device in an embodiment of the present disclosure. As shown in FIG. An audio component 1505 , an input/output (I/O) interface 1506 , a sensor component 1507 , and a communication component 1508 .

The processing component 1501 generally controls the overall operations of the terminal device 1500, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 1501 may include one or more processors 1510 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 1501 may include one or more modules to facilitate interaction between processing component 1501 and other components. For example, the processing component 1501 may include a multimedia module to facilitate interaction between the multimedia component 1504 and the processing component 1501 .

The memory 1502 is configured to store various types of data to support operations at the terminal device 1500 . Examples of such data include instructions for any application or method operating on the terminal device 1500, contact data, phonebook data, messages, pictures, videos, and the like. The memory 1502 can be implemented by any type of volatile or non-volatile memory device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

The power supply component 1503 provides power for various components of the terminal device 1500 . The power supply component 1503 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the terminal device 1500 .

The multimedia component 1504 includes a screen providing an output interface between the terminal device 1500 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may not only sense a boundary of a touch or a swipe action, but also detect duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 1504 includes a front camera and/or a rear camera. When the terminal device 1500 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capability.

The audio component 1505 is configured to output and/or input audio signals. For example, the audio component 1505 includes a microphone (MIC), which is configured to receive an external audio signal when the terminal device 1500 is in an operation mode, such as a calling mode, a recording mode and a voice recognition mode. Received audio signals may be further stored in memory 1502 or sent via communication component 1508 . In some embodiments, the audio component 1505 also includes a speaker for outputting audio signals.

The I/O interface 1506 provides an interface between the processing component 1501 and a peripheral interface module, and the above peripheral interface module may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: a home button, volume buttons, start button, and lock button.

The sensor component 1507 includes one or more sensors for providing status assessment of various aspects of the terminal device 1500 . For example, the sensor component 1507 can detect the open/closed state of the terminal device 1500, the relative positioning of the components, for example, the components are the display and the keypad of the terminal device 1500, and the sensor component 1507 can also detect the position of the terminal device 1500 or a component of the terminal device 1500. Changes in position, presence or absence of user contact with the terminal device 1500 , orientation or acceleration/deceleration of the terminal device 1500 and temperature changes of the terminal device 1500 . Sensor assembly 1507 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 1507 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 1507 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

The communication component 1508 is configured to facilitate wired or wireless communication between the terminal device 1500 and other devices. The terminal device 1500 can access a wireless network based on communication standards, such as Wi-Fi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1508 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1508 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, terminal device 1500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable A programmable gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the methods described above.

Based on the same inventive concept, embodiments of the present disclosure provide a network device, where the network device is consistent with the network device in one or more embodiments above.

FIG. 16 is a schematic structural diagram of a network device in an embodiment of the present disclosure. Referring to FIG. 16 , the network device 1600 may include a processing component 1601, which further includes one or more processors, and a memory represented by a memory 1602 A resource is used to store instructions executable by the processing component 1601, such as an application program. An application program stored in memory 1602 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 1601 is configured to execute instructions, so as to execute any one of the foregoing methods applied to the network device.

The network device 1600 may also include a power supply component 1603 configured to perform power management of the network device 1600, a wired or wireless network interface 1604 configured to connect the network device 1600 to a network, and an input-output (I/O) interface 1605 . The network device 1600 can operate based on an operating system stored in the memory 1602, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™ or the like.

Based on the same inventive concept, an embodiment of the present disclosure also provides a computer-readable storage medium, in which instructions are stored; when the instructions are run on a computer, the terminal is used to execute the above-mentioned one or more embodiments. The communication method on the device side or the network device A side.

Based on the same inventive concept, an embodiment of the present disclosure also provides a computer program or a computer program product. When the computer program product is executed on a computer, the computer implements the terminal device side or the network device A in one or more embodiments above. side communication method.

Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any modification, use or adaptation of the present invention, these modifications, uses or adaptations follow the general principles of the present invention and include common knowledge or conventional technical means in the technical field not disclosed in this disclosure . The specification and examples are to be considered exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It should be understood that the present invention is not limited to the precise constructions which have been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

A random access method, characterized in that, comprising:

The terminal device receives downlink control information DCI sent by the network device, where the DCI includes first indication information, and the first indication information is used to instruct the terminal device to perform random access;

The terminal device determines to update the ephemeris information;

The terminal device performs delayed random access on a physical random access channel PRACH according to the first timing offset and the second timing offset, where the first timing offset is the time between the terminal device and the predetermined The round-trip delay of the reference point, the second timing offset is the length of time that the terminal device delays performing random access on the PRACH.
The method according to claim 1, wherein the terminal device determines to update the ephemeris information, comprising:

The terminal device determines that the valid timer expires;

The terminal device determines to update the ephemeris information.
The method according to claim 1, wherein the terminal device receiving the DCI sent by the network device comprises: the terminal device receiving the DCI on the nth time slot in the downlink time domain resource, where n is positive integer.
The method according to claim 3, wherein the terminal device delays access on a Physical Random Access Channel (PRACH) according to the first timing offset and the second timing offset, comprising: the terminal device After delaying the first duration from the nth time slot in the uplink time domain resources, random access is performed on the next PRACH transmission opportunity, where the first duration is the first timing offset and the first timing offset The sum of the two timing offsets.
The method according to claim 1, wherein the DCI further includes second indication information, and the second indication information is used to indicate the second timing offset.
The method according to claim 1, further comprising:

The terminal device receives system information within a second duration corresponding to the second timing offset;

The terminal device determines the ephemeris information according to the system information;

The terminal device determines the first timing offset according to the determined ephemeris information.
A random access method, characterized in that, comprising:

The network device determines that the terminal device updates the ephemeris information;

The network device sends downlink control information DCI to the terminal device, where the DCI includes first indication information, and the first indication information is used to instruct the terminal device to perform random access.
The method according to claim 7, wherein the network device determines that the terminal device updates the ephemeris information, comprising:

The network device determines that the valid timer of the terminal device has expired;

The network device determines that the terminal device updates the ephemeris information.
The method according to claim 7, wherein the DCI further includes second indication information, the second indication information is used to indicate the second timing offset, and the second timing offset is The terminal device delays the time period for performing random access on the physical random access channel PRACH.
A communication device, characterized by comprising:

A receiving module, configured to receive downlink control information DCI sent by a network device, where the DCI includes first indication information, and the first indication information is used to instruct the terminal device to perform random access;

A processing module, configured to determine to update ephemeris information;

A sending module, configured to perform delayed random access on a physical random access channel PRACH according to a first timing offset and a second timing offset, where the first timing offset is the time between the terminal device and the A round-trip delay of a predetermined reference point, where the second timing offset is a time length during which the terminal device delays performing random access on the PRACH.
The device according to claim 10, wherein the processing module is specifically configured to determine that the valid timer expires; and determine to update the ephemeris information.
The device according to claim 10, wherein the receiving module is configured to receive the DCI on the nth time slot in the downlink time domain resource, where n is a positive integer.
The device according to claim 12, wherein the sending module is configured to perform random access on the next PRACH sending opportunity after delaying the first time length from the nth time slot in the uplink time domain resource, Wherein, the first duration is the sum of the first timing offset and the second timing offset.
The device according to claim 10, wherein the DCI further includes second indication information, and the second indication information is used to indicate the second timing offset.
The device according to claim 10, wherein the receiving module is further configured to receive system information within a second duration corresponding to the second timing offset;

The first processing module is further configured to determine the ephemeris information according to the system information; and determine the first timing offset according to the determined ephemeris information.
A communication device, characterized by comprising:

A processing module, configured to determine that the terminal device updates the ephemeris information;

A sending module, configured to send downlink control information DCI to the terminal device, where the DCI includes first indication information, and the first indication information is used to instruct the terminal device to perform random access.
The apparatus according to claim 16, wherein the processing module is specifically configured to determine that the valid timer of the terminal device has expired; determine that the terminal device updates the ephemeris information.
The device according to claim 16, wherein the DCI further includes second indication information, the second indication information is used to indicate the second timing offset, and the second timing offset is The terminal device delays the time period for performing random access on the physical random access channel PRACH.
A terminal device, characterized in that it includes: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored in the memory, so as to implement claims 1 to 6. The random access method described in any one of these items.
A network device, characterized by comprising: a memory and a processor; the processor is connected to the memory and is configured to execute computer-executable instructions stored on the memory, so as to realize the The random access method described in any one of 9.
A computer storage medium storing computer-executable instructions, wherein the computer-executable instructions can implement the random access method according to any one of claims 1 to 9 after being executed by a processor.