CN113498628B

CN113498628B - Method, device and storage medium for monitoring random access response

Info

Publication number: CN113498628B
Application number: CN201980092825.1A
Authority: CN
Inventors: 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2023-11-17
Anticipated expiration: 2039-07-26
Also published as: CN113498628A; WO2021016773A1

Abstract

The invention discloses a method for monitoring random access response, which comprises the following steps: the terminal equipment determines window parameters of a random access response RAR time window, wherein the window parameters comprise: an offset; the terminal equipment determines the starting time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is the offset after the time for sending the random access request by the terminal equipment. The invention also discloses another method for monitoring the random access response, terminal equipment, network equipment and storage medium.

Description

Method, device and storage medium for monitoring random access response

Technical Field

The present invention relates to mobile communications technologies, and in particular, to a method for monitoring random access response, a terminal device, a network device, and a storage medium.

Background

A non-terrestrial communication network (Non Terrestrial Network, NTN) provides communication services to terrestrial users by way of communication satellite communications. Communication satellite communications have many unique advantages over terrestrial cellular communications, such as: is not limited by the user region, has long communication distance, high stability and the like. However, the signal transmission time between the terminal and the base station is shorter, and the signal transmission time between the terminal and the communication satellite is longer, if the terminal monitors the random access response (Random Access Response, RAR) of the communication satellite, a monitoring mechanism for monitoring the random access response of the base station is adopted, so that the situation that invalid monitoring caused by early starting of the RAR time window occurs, the power consumption of the terminal can be obviously increased, and how to ensure that the terminal equipment effectively monitors the RAR returned by the communication satellite with the smallest power consumption in the random access process is a problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a method for monitoring random access response, terminal equipment, network equipment and a storage medium, which can ensure that the terminal equipment effectively monitors RAR returned by a communication satellite with the smallest power consumption in the random access process.

In a first aspect, an embodiment of the present invention provides a method for listening to a random access response, including:

the terminal equipment determines window parameters of an RAR time window, wherein the window parameters comprise: an offset;

the terminal equipment determines the starting time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is the offset after the time for sending the random access request by the terminal equipment.

In a second aspect, an embodiment of the present invention provides a method for listening for a random access response, including:

the network device sends window parameters of the RAR time window to the terminal device, wherein the window parameters comprise: an offset;

the offset is used for the terminal equipment to determine the starting time of the RAR time window; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment.

In a third aspect, an embodiment of the present invention provides a terminal device, including:

a first determining unit configured to determine a window parameter of a RAR time window, the window parameter including: an offset;

a second determining unit configured to determine a start time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is the offset after the time for sending the random access request by the terminal equipment.

In a fourth aspect, an embodiment of the present invention provides a network device, including:

a sending unit, configured to send, by a network device, window parameters of an RAR time window to a terminal device, where the window parameters include: an offset;

In a fifth aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute, when running the computer program, the steps of a method for listening to a random access response performed by the terminal device.

In a sixth aspect, an embodiment of the present invention provides a source base station, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute, when running the computer program, the steps of a method for listening to a random access response performed by the network device.

In a seventh aspect, an embodiment of the present invention provides a storage medium storing an executable program, where the executable program when executed by a processor implements a method for listening to a random access response performed by the terminal device.

In an eighth aspect, an embodiment of the present invention provides a storage medium storing an executable program, where the executable program when executed by a processor implements a method for listening to a random access response performed by the network device.

The method for monitoring the random access response provided by the embodiment of the invention comprises the following steps: the terminal equipment determines window parameters of an RAR time window, wherein the window parameters comprise: an offset;

the terminal equipment determines the starting time of an RAR time window for monitoring the RAR sent by the network equipment based on the offset; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment. And delaying the starting time of the RAR time window by the offset, so that the terminal equipment effectively monitors the RAR returned by the communication satellite with the smallest power consumption in the random access process.

Drawings

FIG. 1 is a schematic diagram of an alternative process flow of random access according to the present invention;

FIG. 2 is a schematic diagram of an alternative process flow of random access according to the present invention;

FIG. 3 is a schematic diagram of an alternative process flow of random access according to the present invention;

FIG. 4 is a schematic diagram of an alternative component structure of a communication system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an alternative component configuration of a communication system according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an alternative processing flow of a method for listening for a random access response according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an alternative processing flow of a method for listening for a random access response according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an alternative timing relationship provided by an embodiment of the present invention;

fig. 9 is a schematic diagram of an alternative processing flow of a method for listening for a random access response according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an alternative process flow of a method for listening for a random access response according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of an alternative timing relationship provided by an embodiment of the present invention;

fig. 12 is a schematic diagram of an alternative process flow of a method for listening for a random access response according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of an alternative timing relationship provided by an embodiment of the present invention;

fig. 14 is a schematic diagram of an alternative process flow of a method for listening for a random access response according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of an alternative timing relationship provided by an embodiment of the present invention;

fig. 16 is an alternative structural schematic diagram of a terminal device according to an embodiment of the present invention;

fig. 17 is an alternative structural schematic diagram of a network device according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of an alternative electronic device according to an embodiment of the present invention.

Detailed Description

So that the manner in which the features and techniques of the embodiments of the present invention can be understood in more detail, a more particular description of the invention, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the present invention.

Before explaining the method for monitoring random access response provided by the embodiment of the invention in detail, a brief explanation of random access procedure in terrestrial cellular network communication is provided.

In a New Radio (NR) system or NR network, a random access procedure may be triggered by the following events:

the method comprises the steps of establishing wireless connection when the UE is initially accessed: the UE goes from an IDLE state (i.e., rrc_idle state) to a CONNECTED state (i.e., rrc_connected state) of radio resource connection control (Radio Resource Control, RRC); wherein, in the RRC_IDLE state, the RRC connection is not established, and in the RRC_CONNECTED state, the RRC connection is established;

RRC connection reestablishment procedure: so that the UE reestablishes the wireless connection after the wireless link fails;

and (3) switching: the UE needs to establish uplink synchronization with a new cell;

in the rrc_connected state, downlink (DL) data arrives, and at this time, the UL is in an out-of-sync state;

in the rrc_connected state, uplink (UL) data arrives while the UL is in an out-of-sync state or there is no physical uplink control channel (Physical Uplink Control Channel, PUCCH) resource for transmitting a scheduling request (Scheduling Request, SR);

SR failure;

a synchronous reconfiguration request from RRC;

the UE transitions from a connection INACTIVE state (i.e., rrc_inactive state) to an rrc_connected state;

establishing time calibration in a Secondary Cell (SCell) adding process;

request other system messages (System Information, SI);

beam failure recovery.

In the random access procedure, a first type of random access and a second type of random access are included. In the first type of random access, 4 times of information interaction are needed to be executed between the terminal equipment and the network equipment; thus, the first type of random access is also called four-step random access (4-steps RACH). In the second type of random access, 2 information interactions need to be performed between the terminal device and the network device, and thus the second type of random access is also called two-step random access (2-step RACH).

The random access includes a contention-based random access and a non-contention-based random access according to a random access scheme. The random access includes a first type of random access and a second type of random access according to the random access type.

In the NR Rel-15 version, a contention-based random access scheme and a non-contention-based random access scheme are mainly supported.

The process flow of the contention-based random access method, as shown in fig. 1, includes the following four steps:

in step S101, the terminal device sends a random access Preamble (Preamble) to the network device through a message 1 (message 1, msg 1).

The terminal equipment selects PRACH time domain resources and sends the selected Preamble on the selected PRACH time domain resources; the network device can estimate the uplink Timing and the uplink authorization required by the terminal device to transmit the Msg3 according to the Preamble.

In step S102, the network device sends a message 2 (msg 2) to the terminal device.

After detecting that the terminal equipment sends the Preamble, the network equipment sends the RAR to the terminal equipment through the Msg2 to inform the terminal equipment of uplink resource information which can be used when the Msg3 is sent, and a temporary radio network temporary identifier (Radio Network Tempory Identity, RNTI) is allocated to the terminal equipment, time advance command is provided for the terminal equipment, and the like.

After the terminal equipment sends the Msg1, opening an RAR time window, and monitoring a physical downlink control channel (Physical Downlink Control Channel, PDCCH) in the RAR time window; the monitored PDCCH is scrambled by a Random Access RNTI (RA-RNTI), and the calculation formula of the RA-RNTI is as follows:

RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id；

wherein s_id is the sequence number of the first OFDM symbol of the PRACH occasion; t_id is the sequence number of the first time slot of the PRACH opportunity in a system frame; f_id is the sequence number of PRACH opportunity in the frequency domain; ul_carrier_id is the uplink carrier number used to transmit the preamble.

As can be seen from the above formula, the RA-RNTI relates to the physical random access channel (Physical Random Access Channel, PRACH)) time-frequency resources.

After the terminal equipment successfully receives the RA-RNTI scrambled PDCCH, the terminal can obtain the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) scheduled by the PDCCH. Wherein, the PDCCH includes an RAR, and the RAR specifically includes the following information: subheader (subheader), RAPID, payload (payload), upLink (UL) grant (grant), and sample Cell RNTI (Cell RNTI, C-RNTI); wherein, the sub header (sub header) of the RAR includes BI, where BI is used to indicate the backoff time of retransmitting Msg 1; the RAPID in the RAR is a preamble index (preamble index) received by the network response; the payload of the RAR comprises TAG which is used for adjusting the uplink timing; the UL grant is used for scheduling uplink resource indications of the Msg 3; temporary C-RNTI: PDCCH (initial access) for scrambling Msg 4.

If the terminal equipment receives the PDCCH scrambled by the RAR-RNTI and the RAR contains the preamble index sent by the terminal equipment, the terminal equipment considers that the random access response is successfully received.

Step S103, the terminal equipment sends Msg3 in the uplink resource appointed by the RAR message.

Wherein the Msg3 message is mainly used to inform the network device what event the RACH procedure is triggered by. For example, if it is an initial random access event, the terminal device ID and establishment cause are carried in Msg 3; in case of an RRC reestablishment event, the Msg3 carries the terminal equipment identity and establishment cause in the connected state.

Meanwhile, the ID carried by Msg3 may cause the contention conflict to be resolved in step S104.

In step S104, the network device sends Msg4 to the terminal device.

The Msg4 includes a contention resolution message, and allocates uplink transmission resources to the terminal device.

Msg4 has two roles, one for contention conflict resolution and the other for the network to transmit RRC configuration messages to the terminal. The contention resolution is achieved in two ways: one is PDCCH scheduling with C-RNTI scrambling by Msg4 if the UE carries the C-RNTI in Msg3. Another is PDCCH scheduling with TC-RNTI scrambling for Msg4 if the UE does not carry a C-RNTI in Msg3, such as initial access, the solution to the collision is that the UE receives PDSCH of Msg4, serving data units (Service Data Unit, SDU) by matching common control channels (Common Control Channel CCCH) in PDSCH.

When the terminal equipment receives the Msg4 sent by the network equipment, the terminal equipment detects whether the specific temporary identifier of the terminal equipment sent by the Msg3 is contained in the contention resolution message sent by the base station, if so, the terminal equipment indicates that the random access process of the terminal equipment is successful, otherwise, the random access process is considered to be failed, and the terminal equipment needs to initiate the random access process from the first step again.

Another effect of Msg4 is to send a radio resource control (Radio Resource Control, RRC) configuration message to the terminal device.

The processing flow based on the non-contention random access mode, as shown in fig. 2, includes the following three steps:

step S201, the network device sends the allocated random access Preamble to the terminal device.

Step S202, the terminal equipment sends a random access Preamble to the network equipment through the Msg 1.

The PRACH time domain resources and preambles may be specified by the network device based on non-contention random access.

Step S203, the network device sends Msg2 to the terminal device.

After detecting that the terminal equipment sends the Preamble, the network equipment sends the RAR to the terminal equipment through the Msg2.

After the terminal device transmits Msg1, a random access response time window is opened, and the RA-RNTI scrambled PDCCH is monitored within the random access response time window, and description of the random access response can be referred to in step S102.

For non-contention based random access, after the terminal device successfully receives Msg2, the random access procedure ends.

The second type random access in the NR Rel-16 version can improve latency and reduce signaling overhead as compared with the first type track access in the Rel-15 version. The second type of random access process is shown in fig. 3, and includes:

in step S301, the terminal device sends MsgA to the network device.

MsgA comprises Msg1 and Msg3 of the first type of random access.

In step S302, the network device sends MsgB to the terminal device.

MsgB includes Msg2 and Msg4 of the first type of random access.

For the first type of random access shown in fig. 1 and 2, after transmitting Msg1, the UE will monitor the RA-RNTI scrambled PDCCH within the RAR time window to receive the corresponding RAR. If the RAR is not received in the RAR time window, the random access is considered to be failed, and the UE retransmits the Msg1. When the number of times of transmitting the Msg1 by the UE reaches a certain threshold, the UE indicates to a higher layer that a random access problem occurs. The RAR time window starts at the first PDCCH occasion after the UE sends Msg1, and the window length of the RAR time window is configured by the network, and currently, the maximum supportable window length of the RAR time window is 10ms.

For the second type of random access shown in fig. 3, the UE starts a time window after transmitting MsgA, and listens for MsgB from the network device during this time window, as for the first type of random access. If the UE does not receive the MsgB in the time window, the UE considers that the random access fails.

Compared with the cellular network adopted by NR, the signal propagation delay between the UE and the communication satellite in NTN is greatly increased. In addition, because the coverage area of the communication satellite is large, for different UEs within the coverage area of the same communication satellite, there may be a large difference in signal transmission delay between the UEs and the communication satellite due to different positions of the UEs. Thus, if the random access mechanism of NR is directly used in NTN, there are two problems:

on the one hand, the terminal device needs to wait at least 1 Round Trip Time (RTT) from transmitting Msg1 to receiving Msg2, and RTT is the transmission Time of Msg1 plus the transmission Time of Msg 2. Because the coverage area of the base station is smaller in the cellular network, the signal transmission time between the UE and the base station is shorter, so in NR, the UE starts the RAR time window at the first PDCCH timing (occalasion) after Msg1 is sent. In NTN, the signal transmission time between the terminal device and the communication satellite is relatively large, the RTT is up to 541.46ms, the time interval between the transmission of Msg1 from the terminal device and the first PDCCH opportunity is likely to be less than 1 RTT, if the terminal device in NTN still starts the RAR time window at the first PDCCH opportunity after the transmission of Msg1, the problem that the UE starts the RAR time window too early is likely to occur due to too large RTT, and the terminal device will increase the power consumption of the terminal by invalidity monitoring the RAR.

On the other hand, in cellular networks, the signal transmission time difference between different UEs and base stations within the coverage area of the same base station is small. For the transmission of the Msg1 of different terminal equipments using the same RACH resource, the moment when the Msg1 transmitted by different terminal equipments arrives at the base station is also almost similar, so the current configuration of the window length of the RAR time window mainly considers the time required for the base station to process the Msg1 and schedule the Msg 2. In NTN, the coverage area of a communication satellite is large, different UEs within the coverage area of the same communication satellite are located at different positions, and there may be a large difference in signal transmission time between them and the communication satellite. Therefore, if the window length of the RAR time window is not configured long enough, it may result in that a UE further from the communication satellite cannot receive the RAR during the RAR time window due to too large RTT, and if the window length of the RAR time window is configured too long, the UE may increase the time to monitor the RAR, thereby increasing the power consumption of the terminal.

Based on the above-mentioned problems, the embodiment of the present invention provides a method for listening to a random access response, which can be applied to an NTN system,

an exemplary NTN system applied by an embodiment of the present invention may be as shown in fig. 4. The communication system may include a network device 410, and the network device 410 may be a device that communicates with a terminal device 420 (or referred to as a communication terminal, terminal). Network device 410 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area to provide services to the terminal devices within the coverage area.

Optionally, the network device 410 is a communications satellite, unmanned aerial vehicle (Unmanned Aircraft System, UAS) platform. Communication satellites are classified into Low Earth Orbit (LEO) communication satellites, medium Earth Orbit (MEO) communication satellites, geosynchronous Orbit (Geostationary Earth Orbit, GEO) communication satellites, high elliptical Orbit (High Elliptical Orbit, HEO) communication satellites, and the like according to the difference in Orbit heights. Wherein the low orbit communication satellite has a height range of 500 km-1500 km and a corresponding orbit period of about 1.5 hours-2 hours. The signal propagation delay for single hop communications between users (what is called single hop communications) is typically less than 20ms. The maximum communication 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. Geosynchronous orbit communication satellites have an orbit height of 35786km and a period of 24 hours around the earth. The signal propagation delay for single hop communications between users is typically 250ms.

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

The communication system further comprises at least one terminal device 420 located within the coverage area of the network device 410. As used herein, a "terminal device" includes, but is not limited to, a device for a communications satellite network configured to receive/transmit communications signals; and/or internet of things (Internet of Things, ioT) devices. Terminal devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" or "mobile terminals". Examples of mobile terminals include, but are not limited to, communications satellite telephones; a personal communications system (Personal Communications System, PCS) terminal that may combine communications satellite telephones 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 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 410 communicates with terminal device 420 via a service link or wireless link 440. Network device 410 may communicate with gateway 430 based on feeder link or wireless link 450, connecting to a public data network through gateway 430.

Fig. 5 exemplarily shows two base stations and one terminal device, alternatively, the communication system may include a plurality of terminal devices and a plurality of base stations, and the coverage area of each base station may include other number of terminal devices, which is not limited by the embodiment of the present invention.

In one example, as shown in FIG. 5, the network device 410 in the communication system includes two network devices 410-1 and 410-2, wherein the network device 410-1 and the network device 410-2 communicate via an Inter-satellite links (ISL) 460, and the network device 410-1 is configured to transmit payload radio frequency filtering, frequency conversion and amplification, and the signal is not altered by the transmitting network device 410-1. The network device 410-2 is configured to regenerate payload, radio frequency filtering, frequency conversion and amplification, as well as demodulation and decoding, conversion and/or routing, encoding and modulation.

It should be understood that a device having a communication function in a network/system according to an embodiment of the present invention may be referred to as a communication device. Taking the communication system shown in fig. 4 or fig. 5 as an example, the communication device may include a network device 410 and a terminal device 420 with a communication function, where the network device 410 and the terminal device 420 may be specific devices described above, and are not described herein again; the communication device may also include other devices in the communication system, such as other network entities, e.g., UAS, which is not limited in this embodiment of the present invention.

An optional process flow of the method for monitoring random access response provided by the embodiment of the invention is shown in fig. 6, and includes the following steps:

in step S601, the terminal device determines window parameters of the RAR time window, where the window parameters include: offset amount.

The initial time offset is used for the terminal equipment to determine the starting time of the RAR time window; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the starting time of the PDCCH of the first physical downlink control channel after the offset time; the offset time is obtained by offsetting the time of the random access request sent by the terminal equipment by the initial time offset. That is, the offset is used for the terminal device to determine the start time of the RAR time window for monitoring the RAR sent by the network device; the starting time is the first physical downlink control channel PDCCH opportunity after the time for sending the random access request by the terminal equipment is delayed by one offset.

Alternatively, step S601 may be performed as step S601a: and the terminal equipment determines the offset according to the distance between the terminal equipment and the network equipment. The value of the offset is RTT of information transmission between the terminal device and the network device.

For example, the calculation formula of RTT may be formula (1):

rtt= 2*d/v equation (1);

where d is the distance between the location of the terminal device and the network device, and v is the signal transmission rate. Wherein the signal transmission delay of the terminal device=d/v.

In practical application, the embodiment of the invention does not limit the calculation mode of RTT.

The distances from the network device may be different for different terminal devices located in different locations within the coverage area of the network device, at which point the values of the offsets determined by the different terminal devices are different.

Optionally, in the case that the terminal device has positioning capability, the terminal device determines the offset according to its distance from the network device. The terminal device with positioning capability can estimate the distance between the location of itself and the network device based on its positioning capability, thereby determining RTT.

Alternatively, step S601 may be performed as step S601b: and the terminal equipment receives the offset sent by the network equipment.

In the embodiment of the present invention, before executing step S601b, as shown in fig. 7, the method further includes step S600, where the network device sends window parameters of the RAR time window to the terminal device, where the window parameters include: offset amount.

In an embodiment of the present invention, the network device selects an offset to be sent to the terminal device from the supported at least one offset. Here, the network device may preset the supported offset, and when it is determined that the offset needs to be transmitted to the terminal device, select one or more offsets from the supported time offsets, and transmit the selected offsets to the terminal device.

And after the network equipment determines the offset sent to the terminal equipment, broadcasting the broadcast message carried by the determined offset.

Optionally, if the network device determines that there is a terminal device without positioning capability in the terminal devices within the coverage of the network device, the determined offset is carried in a broadcast message for broadcasting. Terminal equipment without positioning capability exists in terminal equipment within the coverage range of the terminal equipment, and the method comprises the following two scenes:

the first scene, part of the terminal devices have positioning capability, and the rest of the terminal devices do not have positioning capability.

Scene two, all terminal devices do not have positioning capability.

The embodiment of the invention does not limit any limitation to the specific implementation of selecting the offset to be sent to the terminal device from the supported offsets by the network device.

Optionally, the network device selects an offset to be sent to the terminal device from the supported at least one offset, including: the network equipment is according to the first round trip transmission time; the first round trip transmission time is the round trip transmission time between the nearest position to the network equipment and the network equipment in the ground range covered by the network equipment; the network device selects an offset to send to the terminal device from the supported at least one offset according to the first round trip transmission time.

Here, the first round trip transmission time is the minimum round trip transmission time rtt_min in the round trip transmission time corresponding to the positions covered by the network device, and rtt_min is calculated by the formula (2):

rtt_min=2×d_min/v formula (2);

wherein d_min is the distance between the nearest position of the network equipment and the network equipment in the ground range covered by the network equipment, namely the shortest distance between the network equipment and the covered ground range, and v is the signal transmission rate.

Optionally, the selecting an offset to be sent to the terminal device from the supported at least one offset according to the first round trip transmission time includes:

The supported at least one offset comprises a candidate offset smaller than the first round trip transmission time, and the largest candidate offset in the candidate offsets is selected as the offset sent to the terminal equipment; the supported at least one offset does not include a candidate offset smaller than the first round trip transmission time, and the smallest offset in the supported at least one offset is selected as the offset sent to the terminal equipment.

Such as: the offsets supported by the network device include: offset 1, offset 2, offset 3, offset 4, offset 5, and offset 6, and are ordered sequentially from large to small: offset 1, offset 2, offset 3, offset 4, offset 5, and offset 6. When the offset 1, the offset 2, and the offset 3 are all larger than rtt_min, the offset 4, the offset 5, and the offset 6 are all smaller than rtt_min, the offset smaller than rtt_min is obtained: offset 4 closest to rtt_min among offset 4, offset 5, and offset 6 is used as the offset to be transmitted to the terminal device. When the offset 1, the offset 2, the offset 3, the offset 4, the offset 5 and the offset 6 are all larger than rtt_min, the smallest offset 6 is selected as the offset sent to the terminal device.

Alternatively, in the case where the terminal device does not have positioning capability, the terminal device performs step S601b: and the terminal equipment receives the offset sent by the network equipment.

In the embodiment of the present invention, the terminal device may perform step S601a or perform step S610b based on whether the terminal device has its own positioning capability, or the terminal device may also perform step S601a and step S610b, and select the offset determined in step S601a or step S610b as the offset for controlling the RAR time window.

Taking the offset sent by the network device received by the terminal device as an example, the terminal device may receive the offset broadcast by the network device through a broadcast message. For terminal devices in different locations of the coverage area of the network device, the offset of the broadcast of the network device received by the terminal devices is the same.

The terminal device may receive the offset broadcast by the network device based on the system information block (System Information Block, SIB) in the broadcast message.

In step S602, the terminal device determines the start time of the RAR time window based on the offset.

The starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment.

Optionally, the message corresponding to the random access request is Msg1 shown in fig. 1 or fig. 2, and the message corresponding to the monitored RAR is Msg2 shown in fig. 1 or fig. 2. Alternatively, the message corresponding to the random access request is MsgA shown in fig. 3, and the message corresponding to the monitored RAR may be MsgB shown in fig. 3.

As shown in fig. 8, the terminal device sends out a random access request at a time point T1, the time obtained after delaying T1 by an offset rar_timeout is referred to as a reference time T2, that is, the time difference between T1 and T2 is an offset rar_timeout, and the time point T3 is the first PDCCH opportunity after T2, then T3 is the start time of the RAR time window 801.

Optionally, the determining, by the terminal in step S601, the window parameter further includes: at least one window length; correspondingly, as shown in fig. 9, the method further includes step S603: the terminal device determines a maximum time of the RAR time window based on the at least one window length.

The window length represents the longest duration of the RAR time window, the terminal equipment monitors the RAR returned by the network equipment within the window length range until the RAR is monitored or the monitoring duration reaches the window length, namely the RAR time window is overtime, and the terminal equipment stops monitoring the RAR.

And the terminal equipment monitors the RAR in the RAR time window and determines that the random access is successful. The terminal equipment does not monitor RAR in the RAR time window, determines random access failure, reports high-level random access failure or reinitiates the random access process.

Optionally, the determining, by the terminal device, the at least one window length in step S603 includes: the terminal equipment receives the at least one window length sent by the network equipment.

In the embodiment of the present invention, before the terminal device receives the at least one window length sent by the network device, the window parameters sent by the network device to the terminal device further include: at least one window length for the terminal device to determine a maximum time of the RAR time window.

In an embodiment of the present invention, the at least one window length includes at least one of the following three cases:

the first case, the first window length;

second case, second window length;

case three, first window length and second window length.

Here, the first window length is smaller than the second window length.

The network device may send the first window length to a portion of the terminal devices, the second window length to a portion of the terminals, and the first window length and the second window length to the remaining portion. In an example, a terminal device within the coverage of a network device includes terminal 1 and terminal 20, and the network device sends a first window length to terminals 1-5 and a first window length and a second window length to terminals 6-20. In yet another example, a terminal device within the coverage area of a network device includes terminal 1 and terminal 20, and the network device sends a first window length to terminals 1-7 and a second window length to terminals 8-20. In yet another example, a terminal device within the coverage of a network device includes terminal 1 and terminal 20, and the network device sends a second window length to terminals 1-10 and sends a first window length and a second window length to terminals 11-20.

In the embodiment of the invention, the window length sent by the network equipment is not limited.

Optionally, in the case that the terminal devices within the coverage area of the network device have positioning capabilities, the network device sends the first window length to the terminal device. Optionally, the network device sends the second window length to the terminal device in case none of the terminal devices within the coverage area of the network device has positioning capabilities. Optionally, in a case where a portion of the terminal devices within the coverage area of the network device have positioning capability and the remaining portion do not have positioning capability, the network device sends the first window length and the second window length to the terminal device.

Optionally, a first window length is determined according to a scheduling time of the network device; the scheduling time is a time reserved by the network device for processing random access requests and RARs. Optionally, the scheduled time network device reserves time for processing Msg1 and scheduling Msg 2. Optionally, the scheduled time network device reserves time for processing MsgA and scheduling MsgB.

Optionally, the second window length is determined according to a round trip transmission time difference and a scheduling time of the network device, wherein the round trip transmission time difference is a time difference between a first round trip transmission time and a second round trip transmission time, and the first round trip time is a round trip transmission time between a position closest to the network device and the network device in a ground range covered by the network device; the second round trip time is the round trip transmission time between the position farthest from the network equipment and the network equipment in the ground range covered by the network equipment; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

The terminal device calculates a reference round trip time rtt_refe, illustratively from the round trip time difference rtt_delta and the scheduling time process_time, and selects a second window length from the supported at least one window length, depending on the reference round trip time rtt_refe.

The calculation formula with reference to the round trip transmission time rtt_refe may be formula (3):

rtt_refe = rtt_delta + process_time formula (3);

wherein rtt_delta=2 (d_max-d_min)/v; i.e., rtt_refe, can be calculated by equation (4):

rtt_refe=2 x (d_max-d_min)/v+process_time formula (4);

d_max is the distance between the ground position farthest from the communication satellite in the coverage area of the network equipment and the network equipment, and d_min is the distance between the ground position closest to the communication satellite in the coverage area of the network equipment and the network equipment. Process_time is the time reserved for the network device to process Msg1 (or Msg A) and schedule Msg2 (or Msg B).

Optionally, the supported at least one window length includes a candidate window length greater than rtt_refe, and selecting a minimum candidate window length of the candidate window lengths as a second window length; the supported at least one window length does not include a candidate window length greater than rtt_refe, and the largest window length of the supported at least one window length is selected as the second window length.

Such as: the window length supported by the network device includes: window length 1, window length 2, window length 3, window length 4, window length 5 and window length 6, and order in order from small to large: window length 1, window length 2, window length 3, window length 4, window length 5, and window length 6. When window length 1, window length 2, window length 3 are all less than rtt_refe, window length 4, window length 5, and window length 6 are all greater than rtt_refe, the window length will be greater than rtt_refe: window length 4 closest to rtt_refe among window length 4, window length 5, and window length 6 is taken as the second window length. When the window length 1, the window length 2, the window length 3, the window length 4, the window length 5 and the window length 6 are smaller than rtt_refe, the maximum window length 6 is selected as the second window length.

Optionally, the network device broadcasts the at least one window length to be sent through a broadcast message, and the terminal device receives the at least one window length of the RAR time window broadcast by the network device through the broadcast message. For terminal devices in different locations of the coverage area of the network device, the window length of the broadcast of the network device received by the terminal device may be the same or different.

The terminal device may receive at least one window length broadcast by the network device based on the SIB in the broadcast message. Alternatively, the terminal device may be based on the same SIB reception offset and at least one window length. Alternatively, the terminal device may receive the offset and at least one window length based on different SIBs.

In case the terminal device has positioning capabilities, the terminal device determines the longest time of the RAR time window based on the first window length. In case the terminal device does not have positioning capability, the terminal device determines the longest time of the RAR time window based on the second window length.

The determination of the window length by the terminal device is described taking the case that the terminal device has positioning capability. The terminal equipment in the coverage area of the network equipment has positioning capability, and the terminal equipment receives the first window length and takes the received first window length as the longest time of the RAR time window; and the terminal equipment in the coverage area of the network equipment has positioning capability and does not have positioning capability, the terminal equipment receives the first window length and the second window length, and the received first window length is used as the longest time of the RAR time window under the condition that the terminal equipment has positioning capability.

The determination of the window length by the terminal device is described by taking the example that the terminal device does not have positioning capability. Terminal equipment in the coverage area of the network equipment does not have positioning capability, and the terminal equipment receives the second window length and takes the received second window length as the longest time of the RAR time window; and the terminal equipment in the coverage area of the network equipment has positioning capability and does not have positioning capability, the terminal equipment receives the first window length and the second window length, and the received second window length is used as the longest time of the RAR time window under the condition that the terminal equipment does not have positioning capability.

In the following, a method for listening to a random access response provided by the embodiment of the present invention is illustrated by using a network device as a communication satellite through different examples.

Example one

Aiming at the scene that all the UE does not have positioning capability, the communication satellite configures window parameters of the RAR time window in a broadcast mode, wherein the configured window parameters comprise at least one offset value and at least one window length of the RAR time window, and the behavior of starting and maintaining the RAR time window by all the UE follows the configuration of the communication satellite; when the random access is the first type random access, the RAR time window is a time window for monitoring Msg2, and when the random access is the second type random access, the RAR time window is a time window for monitoring Msg B.

The following takes the first type of random access as an example, and the processing flow of the random access is shown in fig. 10:

in step S1001, the UE receives an offset and a window length of a RAR time window configured by the communication satellite.

The window parameters received by the UE from the network side include: the offset of the RAR time window RAR_TimeOffset and the window length (ra-ResponseWindow) of the RAR time window.

The window parameters are configured for cell public, and can be carried in the system message. For example, SIBx (x is 1 or more) is used to carry window parameters.

Offset for RAR time window rar_timeoffset: the communication satellite may be determined based on a signal transmission rtt_min between a position closest to the communication satellite within a ground range covered by the communication satellite and the communication satellite. The calculation formula of rtt_min is shown as formula (2),

rtt_min=2×d_min/v formula (2);

wherein d_min is the distance between the nearest position of the communication satellite and the communication satellite in the ground range covered by the communication satellite, and v is the signal transmission speed.

If there is an RAR_TimeOffset smaller than RTT_min in all RAR_TimeOffsets supported by the communication satellite, the RAR_TimeOffset in the window parameter is configured as the RAR_TimeOffset which is smaller than RTT_min and closest to RTT_min in all the supported RAR_TimeOffsets.

If all RAR_TimeOffset values supported by the communication satellite are larger than RTT_min, the RAR_TimeOffset in the window parameter is configured as the smallest RAR_TimeOffset in all the supported RAR_TimeOffsets.

The offset configured by the network device may be referred to herein as a configured rar_timeoffset_config.

It should be noted that, the configuration of the rar_time_offset depends on the communication satellite, and the above only provides an implementation method for the communication satellite to select the rar_time_offset_config in the window parameter from the supported rar_time_offset, and the network may also determine the rar_time_offset_config in the window parameter according to other manners.

Window length Ra-ResponseWindow for RAR time window: the communication satellite may determine Ra-ResponseWindow based on the following factors: the difference in signal transmission RTT between the closest and farthest positions of the communication satellites and the communication satellite within the ground range covered by the communication satellite RTT_delta, and the time process_time required for the communication satellite to process Msg1 and schedule Msg 2. Wherein rtt_delta=2 (d_max-d_min)/v; here, the reference round trip transmission time rtt_refe is first calculated based on equation (4):

rtt_refe=2 x (d_max-d_min)/v+process_time formula (4);

wherein d_max is the distance between the ground position farthest from the communication satellite in the coverage area of the communication satellite and the communication satellite, d_min is the distance between the ground position closest to the communication satellite in the coverage area of the communication satellite and the communication satellite, v is the signal transmission speed, and process_time is the time reserved by the communication satellite for processing Msg1 and scheduling Msg 2.

If there is a value greater than RTT __ refe in all Ra-responseWindow supported by the communication satellite, then Ra-responseWindow in the window parameters is configured to be the Ra-responseWindow that is greater than RTT_refe and closest to RTT_refe in all Ra-responseWindow supported.

If all Ra-responseWindow supported by the communication satellite is smaller than the value of RTT_refe, configuring Ra-responseWindow in the window parameters as the largest Ra-responseWindow in the supported Ra-responseWindow values.

It should be noted that, the configuration of Ra-ResponseWindow depends on the network implementation, and the above only provides an implementation method for selecting Ra-ResponseWindow in the window parameters from the supported Ra-ResponseWindow by the communication satellite, and the network may also determine Ra-ResponseWindow in the window parameters according to other manners.

In step S1002, the UE transmits Msg1 to the communication satellite.

In step S1003, the UE monitors the RAR according to the offset and the window length of the received RAR time window.

And the UE starts to monitor the PDCCH scrambled by the RA-RNTI at the first PDCCH opportunity after the RAR_TimeOffset time after the Msg1 is transmitted according to the offset and the window length of the RAR time window transmitted by the communication satellite, and receives the corresponding RAR. The longest time that the UE listens to the RAR is the Ra-response window received. Wherein, RAR_TimeOffset and Ra-responseWindow are both values configured using communication satellites.

As shown in fig. 11, 3 UEs within the coverage of the communication satellite: UE1, UE2 and UE3 respectively receive offset RAR_TimeOffset and window length Ra-ResponseWindow of RAR time window sent by communication satellite based on SSB, in the random process, the UE starts RAR time window after the first PDCCH opportunity after the RAR_TimeOffset time after Msg1 (i.e. Msg1_1, msg1_2 and Msg1_3) is sent respectively, and the UE monitors and receives RAR (RAR of UE1, UE2 and UE3 are RAR_1, RAR_2 and RAR_3 respectively) during the RAR time window until the RAR is successfully received or the RAR time window is overtime. Here, both rar_timeoffset and Ra-response window use the values of the communication satellite configuration. The signal transmission delays of the UE1, the UE2 and the UE3 are respectively: delay_1, delay_2, and delay_3.

Example two

For the scenario that all UEs have positioning capability, the communication satellite configures window parameters of the RAR time window in a broadcast manner, wherein the window parameters comprise window length of at least one RAR time window, the UE determines the offset of the RAR time window according to the estimated signal transmission RTT between itself and the communication satellite, and the longest time (i.e. window length of the time window) for monitoring Msg2/MsgB follows the configuration of the communication satellite. When the random access is the first type random access, the RAR time window is a time window for monitoring Msg2, and when the random access is the second type random access, the RAR time window is a time window for monitoring Msg B.

The following takes the first type of random access as an example, and the processing flow of the random access is shown in fig. 12:

in step S1201, the UE receives the window length of the RAR time window configured by the communication satellite.

The window length of the RAR time window of the network configuration is configured for the public cell, and can be carried in a system message. For example, SIBx (x is 1 or more) is used to carry the window length of the RAR time window.

Configuration of window length Ra-ResponseWindow for RAR time window: the communications satellite may determine Ra-ResponseWindow based on the time required to process Msg1 and schedule Msg 2.

In step S1202, the UE determines an offset of the RAR time window based on the positioning capability.

The UE estimates the distance d between the UE and the communication satellite according to the position of the UE based on the positioning capability, and further determines the signal transmission RTT= 2*d/v of the UE and the communication satellite, wherein the signal transmission delay=d/v of the UE and the communication satellite, namely RTT=2×delay, v is the signal transmission rate. The offset rar_timeoffset=rtt of the RAR window of the UE.

In step S1203, the UE transmits Msg1 to the communication satellite.

In step S1204, the UE monitors the RAR according to the determined offset of the RAR time window and the window length of the received RAR time window.

In the random access procedure, the UE starts to start an RAR time window at the first PDCCH opportunity after the time rar_timeout after Msg1 is sent, and the maximum time for the UE to monitor RAR is Ra-ResponseWindow. Wherein, RAR_TimeOffset adopts the value calculated by UE in step S902, and Ra-responseWindow adopts the value configured by communication satellite.

As shown in fig. 13, 3 UEs within the coverage of the communication satellite: UE1, UE2 and UE3 respectively receive the window length of the RAR time window sent by the communication satellite based on SSB, and each UE estimates the signal transmission RTT of the UE and the communication satellite based on positioning capability, namely RTT_1, RTT_2 and RTT_3, so as to further determine the offset of the RAR time window of the UE. The offsets rar_timeoffset_of the RAR time windows respectively determined by UE1, UE2 and UE3 are respectively: rar_timeoffset_1=rtt_1=2×delay_1, rar_timeoffset_2=rtt_2=2×delay_2, rar_timeoffset_3=rtt_3=2×delay_3.delay_1, delay_2, and delay_3 are the signal transmission delays of UE1, UE2, and UE3, respectively.

During random access of UE1, UE2 and UE 3:

for UE1, UE1 starts an RAR time window, and the duration of the RAR time window adopts a value configured by a communication satellite, when UE1 sends Msg1, that is, the first PDCCH opportunity after the rar_timeout_1 after msg1_1 has elapsed time.

For UE2, UE2 sends Msg1, that is, the first PDCCH opportunity after the rar_time offset_2 after msg1_2 has elapsed time, UE2 starts an RAR time window, and the duration of the RAR time window adopts a network configured value.

For UE3, UE3 transmits Msg1, that is, the first PDCCH opportunity after the rar_time offset_3 after msg1_3 has elapsed time, and UE3 starts an RAR time window, where the duration of the RAR time window adopts a value configured by a communication satellite.

Each UE listens to and receives RAR during the RAR time window (RAR for UE1, UE2 and UE3 are rar_1, rar_2 and rar_3 respectively) until the RAR is successfully received or the RAR time window times out.

Example three

For a scenario in which a UE with positioning capability and a UE without positioning capability coexist, a communication satellite configures window parameters of an RAR time window in a broadcast manner, where the configured window parameters include: an offset value of at least one RAR time window and at least two window lengths.

For a UE with positioning capability and a UE without positioning capability, different ways are used to determine whether the UE determines the offset of the RAR time window according to whether the UE has positioning capability or not, and monitor the longest time of Msg2/MsgB (i.e., the window length of the RAR time window).

The following takes the first type of random access as an example, and the processing flow of the random access is shown in fig. 14:

step S1401, the UE receives a window parameter of a RAR time window configured by the communication satellite;

the configured window parameters include: the starting time offset of one RAR time window and the window length of two RAR time windows.

The configured window parameters are cell public configuration and can be carried in a system message. For example, SIBx (x is 1 or more) is used to carry window parameters.

Offset for RAR time window rar_timeoffset: the communication satellite may be determined according to the signal transmission rtt_min between the position closest to the communication satellite within the ground range covered by the communication satellite and the communication satellite, that is, the rar_time offset is determined by the same method as in step S701 of the embodiment, where rar_time offset=rar_time offset_config.

The window length Ra-ResponseWindow of the RAR time window includes: a long window length Ra-responseWindow_long and a short window length Ra-responseWindow_short.

The long window length Ra-responseWindow_long can be determined based on the following factors: the difference in signal transmission RTT between the position closest to the communication satellite and the position farthest from the communication satellite within the ground range covered by the communication satellite and the communication satellite, and the time required for the communication satellite to process Msg1 and schedule Msg2 are determined, that is, the same method as Ra-response window in step S1001 of the embodiment.

The short window length Ra-response window_short can be determined according to the time required for processing Msg1 and scheduling Msg2 by the communication satellite, i.e., the same method as in step S1201 of the second embodiment.

It should be noted that, here, the offset of the RAR time window and the window length (including Ra-responsewindow_long and Ra-responsewindow_short) depend on the implementation of the communication satellite, and the above only gives one implementation method for determining window parameters of the communication satellite, and the network may determine those window parameters according to other methods.

In step S1402, the UE determines an offset of the RAR time window and a window length based on whether the UE has positioning capability.

For a UE with positioning capability, the offset of the RAR time window is estimated by the UE to be the signal transmission RTT of the communication satellite communication with the UE, and the window length of the RAR time window is the short window length Ra-response window_short configured by the network.

For a UE without positioning capability, the offset of the RAR time window is rar_time offset_config configured by the network, and the window length of the RAR time window is a long window length Ra-responsewindow_long configured by the communication satellite.

In step S1403, the UE transmits Msg1 to the communication satellite.

In step S1404, the UE monitors the RAR according to the determined offset and window length of the RAR time window.

In the random access process, the first PDCCH opportunity after RAR_TimeOffset after Msg1 is sent by the UE starts to start an RAR time window, and the longest time for the UE to monitor the RAR is Ra-ResponseWindow. Wherein, RAR_TimeOffset and Ra-responseWindow take the values determined in step S1102.

As shown in fig. 15, 3 UEs within the coverage of the communication satellite: UE1, UE2 and UE3 respectively receive window parameters of RAR time windows sent by communication satellites based on SSB, wherein the received window parameters comprise: the starting time of 1 RAR time window is offset by RAR_TimeOffset_config and 2 window lengths (Ra-ResponseWindow_short and Ra-ResponseWindow_long). The signal transmission delays of UE1, UE2 and UE3 are respectively: delay_1, delay_2, and delay_3.

For UE1, UE2, and UE3, each UE determines the offset and window length of the respective RAR time window based on whether it has positioning capabilities.

For UE1, the UE has positioning capability, and the offset of the RAR time window of UE1 is determined according to the estimated signal transmission delay between itself and the communication satellite of the UE, that is, rar_timeout_1=rtt_1=2×delay_1, and the window length Ra-response window_1=ra-response window_short of the RAR time window.

For UE2, the UE does not have positioning capability, then the offset of the RAR time window of UE2 uses the network device configured value, i.e., rar_timeoffset_2=rar_timeoffset_configt, the window length Ra-responsewindow_2=ra-responsewindow_long of the RAR time window.

For UE3, the UE has positioning capability, and the offset of the RAR time window of UE3 is determined according to the estimated signal transmission delay between itself and the communication satellite of the UE, that is, rar_timeout_3=rtt_3=2×delay_3, where the window length Ra-response window_3=ra-response window_short of the RAR time window.

For each UE, during random access, the UE starts to start the RAR time window the first PDCCH opportunity after the rar_time offset time after transmitting msg1 (i.e., msg1_1, msg1_2, and msg1_3), and the longest time for the UE to listen to RAR (RAR for UE1, UE2, and UE3 are rar_1, rar_2, and rar_3, respectively) is Ra-response window.

The RAR monitoring method provided by the embodiment of the invention can well ensure that the terminal equipment in the NTN can effectively receive the Msg2/MsgB, and simultaneously takes account of power saving to the greatest extent.

In order to implement the method for monitoring random access response, the embodiment of the present invention further provides a terminal device, where, as shown in fig. 16, a terminal device 1600 includes:

a first determining unit 1601 configured to determine window parameters of the RAR time window, the window parameters including: an offset;

a second determining unit 1602 configured to determine a start time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment.

In the embodiment of the present invention, the first determining unit 1601 is further configured to:

and determining the offset according to the distance between the terminal equipment and the network equipment.

In the embodiment of the present invention, the first determining unit 1601 is further configured to: and under the condition that the terminal equipment has positioning capability, determining the offset according to the distance between the terminal equipment and the network equipment.

and receiving the offset sent by the network equipment.

In the embodiment of the present invention, the first determining unit 1601 is further configured to: and receiving the offset sent by the network equipment under the condition that the terminal equipment does not have positioning capability.

In the embodiment of the present invention, the first determining unit 1601 is further configured to: the offset broadcast by the network device is received via a broadcast message.

In the embodiment of the present invention, the window parameters further include: at least one window length; the terminal device further includes: a third determination unit configured to:

the longest time of the RAR time window is determined based on the window length.

the terminal equipment receives the at least one window length sent by the network equipment.

In the embodiment of the present invention, the first determining unit 1601 is further configured to: the terminal device receives at least one window length of the RAR time window broadcast by the network device through a broadcast message.

In an embodiment of the present invention, the first determining unit 1601, the at least one window length includes: a first window length and a second window length, the first window length being less than the second window length.

In an embodiment of the present invention, the third determining unit is further configured to: and determining the longest time of the RAR time window based on the first window length under the condition that the terminal equipment has positioning capability.

In an embodiment of the present invention, the third determining unit is further configured to: and determining the longest time of the RAR time window based on the second window length under the condition that the terminal equipment does not have positioning capability.

The embodiment of the invention also provides a terminal device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the method for monitoring random access response executed by the terminal device when the computer program runs.

The embodiment of the present invention further provides a network device, and a schematic structural diagram of the network device, as shown in fig. 17, a network device 1700 includes:

A sending unit 1701, configured to send, by a network device, window parameters of an RAR time window to a terminal device, where the window parameters include: an offset;

In an embodiment of the present invention, network device 1700 further includes: a selection unit configured to:

an offset to be sent to the terminal device is selected from the supported at least one offset.

In an embodiment of the present invention, the selecting unit is further configured to:

the network equipment is according to the first round trip transmission time; the first round trip transmission time is the round trip transmission time between the nearest position to the network equipment and the network equipment in the ground range covered by the network equipment;

the network device selects an offset to send to the terminal device from the supported at least one offset according to the first round trip transmission time.

selecting the largest candidate offset from the candidate offsets as the offset to be transmitted to the terminal equipment in the case that the supported at least one offset includes the candidate offset smaller than the first round trip transmission time;

and selecting the smallest offset in the supported at least one offset as the offset sent to the terminal equipment under the condition that the candidate offset smaller than the first round trip transmission time is not included in the supported at least one offset.

In the embodiment of the present invention, the window parameters further include: at least one window length for the terminal device to determine a maximum time of the RAR time window.

In an embodiment of the present invention, the at least one window length includes: a first window length, the first window length being determined according to a scheduling time of the network device; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

In an embodiment of the present invention, the at least one window length includes: a second window length, where the second window length is determined according to a round trip transmission time difference and a scheduling time of the network device, where the round trip transmission time difference is a time difference between a first round trip transmission time and a second round trip transmission time, and the first round trip time is a round trip transmission time between a location closest to the network device and the network device in a ground range covered by the network device; the second round trip time is the round trip transmission time between the position farthest from the network equipment and the network equipment in the ground range covered by the network equipment; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

The embodiment of the invention also provides a network device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the method for monitoring random access response executed by the network device when the computer program runs.

Fig. 18 is a schematic diagram of a hardware composition structure of an electronic device (a terminal device and a network device) according to an embodiment of the present invention, and an electronic device 1800 includes: at least one processor 1801, memory 1802, and at least one network interface 1804. The various components in the electronic device 1800 are coupled together by a bus system 1805. It is appreciated that the bus system 1805 is employed to facilitate connected communications between these components. The bus system 1805 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration the various buses are labeled as bus system 1805 in fig. 18.

It is to be appreciated that memory 1802 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Wherein the nonvolatile Memory may be ROM, programmable read-Only Memory (PROM, programmable Read-Only Memory), erasable programmable read-Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable read-Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk read-Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 1802 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory 1802 in an embodiment of the present invention is used to store various types of data to support the operation of the electronic device 1800. Examples of such data include: any computer programs for operation on the electronic device 1800, such as the application 18021. A program for implementing the method of the embodiment of the present invention may be included in the application 18021.

The methods disclosed in the embodiments of the present invention described above may be applied to the processor 1801 or implemented by the processor 1801. The processor 1801 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuitry in hardware or instructions in software in the processor 1801. The processor 1801 may be a general purpose processor, a digital signal processor (DSP, digital Signal Processor), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor 1801 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiment of the invention can be directly embodied in the hardware of the decoding processor or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium including memory 1802, and processor 1801 reads information from memory 1802 and performs the steps of the methods described above in connection with the hardware thereof.

In an exemplary embodiment, the electronic device 1800 can be implemented by one or more application specific integrated circuits (ASIC, application Specific Integrated Circuit), DSPs, programmable logic devices (PLDs, programmable Logic Device), complex programmable logic devices (CPLDs, complex Programmable Logic Device), FPGAs, general purpose processors, controllers, MCUs, MPUs, or other electronic elements for performing the aforementioned methods.

The embodiment of the invention also provides a storage medium for storing the computer program.

Optionally, the storage medium may be applied to a terminal device in the embodiment of the present invention, and the computer program makes a computer execute corresponding flows in each method in the embodiment of the present invention, which is not described herein for brevity.

Optionally, the storage medium may be applied to a network device in the embodiment of the present invention, and the computer program makes a computer execute corresponding flows in each method in the embodiment of the present invention, which is not described herein for brevity.

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

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is not intended to limit the scope of the invention, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the invention.

Claims

1. A method of listening for a random access response, comprising:

The terminal equipment determines window parameters of a random access response RAR time window, wherein the window parameters comprise: an offset;

the terminal equipment determines the starting time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is the offset after the time for sending the random access request by the terminal equipment;

the window parameters further include: at least one window length; the maximum time of the RAR time window is determined based on the at least one window length;

the at least one window length includes: a second window length, where the second window length is determined according to a round trip transmission time difference and a scheduling time of the network device, where the round trip transmission time difference is a time difference between a first round trip transmission time and a second round trip transmission time, and the first round trip transmission time is a round trip transmission time between a location closest to the network device and the network device in a ground range covered by the network device; the second round trip transmission time is the round trip transmission time between the position farthest from the network equipment and the network equipment in the ground range covered by the network equipment; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

2. The method of claim 1, the terminal device determining the offset, comprising:

and the terminal equipment determines the offset according to the distance between the terminal equipment and the network equipment.

3. The method according to claim 2, wherein the terminal device determines the offset according to its distance from the network device in case the terminal device has positioning capabilities.

4. The method of claim 1, the terminal device determining the offset, comprising:

and the terminal equipment receives the offset sent by the network equipment.

5. The method of claim 4, the terminal device receives the offset sent by a network device without positioning capabilities of the terminal device.

6. The method of claim 4 or 5, the terminal device receiving the offset broadcast by the network device via a broadcast message.

7. The method of claim 6, the terminal device determining the at least one window length, comprising:

8. The method of claim 7, the terminal device receives at least one window length of a RAR time window broadcast by the network device through a broadcast message.

9. The method of claim 7, the at least one window length further comprising: a first window length, the first window length being less than the second window length.

10. The method of claim 9, the terminal device determining a longest time of the RAR time window based on the first window length, if the terminal device has positioning capabilities.

11. The method of claim 9, the terminal device determining a longest time of the RAR time window based on the second window length without positioning capabilities of the terminal device.

12. A method of listening for a random access response, comprising:

the offset is used for the terminal equipment to determine the starting time of the RAR time window; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for the terminal equipment to send out the random access request;

the window parameters further include: at least one window length for the terminal device to determine a maximum time of the RAR time window;

13. The method of claim 12, the method further comprising:

the network device selects an offset to send to the terminal device from the supported at least one offset.

14. The method of claim 13, the network device selecting an offset to send to the terminal device from the supported at least one offset, comprising:

15. The method of claim 14, the selecting an offset from the supported at least one offset to send to the terminal device according to the first round trip transmission time, comprising:

the supported at least one offset comprises a candidate offset smaller than the first round trip transmission time, and the largest candidate offset in the candidate offsets is selected as the offset sent to the terminal equipment;

the supported at least one offset does not include a candidate offset smaller than the first round trip transmission time, and the smallest offset in the supported at least one offset is selected as the offset sent to the terminal equipment.

16. The method of claim 12, the at least one window length further comprising: a first window length, the first window length being determined according to a scheduling time of the network device; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

17. A terminal device, comprising:

A second determining unit configured to determine a start time of the RAR time window based on the offset; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment;

the window parameters further include: at least one window length; the terminal device further includes: a third determining unit configured to determine a longest time of the RAR time window based on the window length;

18. The terminal device of claim 17, the first determining unit further configured to:

19. The terminal device of claim 18, the first determining unit further configured to: and under the condition that the terminal equipment has positioning capability, determining the offset according to the distance between the terminal equipment and the network equipment.

20. The terminal device of claim 17, the first determining unit further configured to:

and receiving the offset sent by the network equipment.

21. The terminal device of claim 20, the first determining unit further configured to: and receiving the offset sent by the network equipment under the condition that the terminal equipment does not have positioning capability.

22. The terminal device according to claim 20 or 21, the first determining unit being further configured to: the offset broadcast by the network device is received via a broadcast message.

23. The terminal device of claim 22, the first determining unit further configured to:

24. The terminal device of claim 23, the first determining unit is further configured to: the terminal device receives at least one window length of the RAR time window broadcast by the network device through a broadcast message.

25. The terminal device of claim 23, the at least one window length further comprising: a first window length, the first window length being less than the second window length.

26. The terminal device of claim 25, the third determining unit further configured to: and determining the longest time of the RAR time window based on the first window length under the condition that the terminal equipment has positioning capability.

27. The terminal device of claim 25, the third determining unit further configured to: and determining the longest time of the RAR time window based on the second window length when the terminal equipment does not have positioning capability.

28. A network device, comprising:

the offset is used for the terminal equipment to determine the starting time of the RAR time window; the RAR time window is used for monitoring RAR sent by the network equipment; the starting time is the first physical downlink control channel PDCCH opportunity after the reference time; the reference time is an offset after the time for sending the random access request by the terminal equipment;

29. The network device of claim 28, the network device further comprising: a selection unit configured to:

30. The network device of claim 29, the selection unit further configured to:

31. The network device of claim 30, the selection unit further configured to:

32. The network device of claim 28, the at least one window length further comprising: a first window length, the first window length being determined according to a scheduling time of the network device; the scheduling time is a time reserved by the network device for processing random access requests and RARs.

33. A terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is adapted to perform the steps of the method of listening for a random access response of any one of the preceding claims 1 to 11 when running the computer program.

34. A network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is adapted to perform the steps of the method of listening for a random access response of any one of the preceding claims 12 to 16 when running the computer program.

35. A storage medium storing an executable program which when executed by a processor implements the method of listening for a random access response of any one of the preceding claims 1 to 11.

36. A storage medium storing an executable program which when executed by a processor implements the method of listening for a random access response of any one of the preceding claims 12 to 16.