CN113163481B

CN113163481B - Method for determining uplink transmission timing, terminal and base station

Info

Publication number: CN113163481B
Application number: CN202010076150.6A
Authority: CN
Inventors: 柯颋; 王飞; 徐珉; 徐晓东; 王启星; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-01-23
Filing date: 2020-01-23
Publication date: 2022-12-27
Anticipated expiration: 2040-01-23
Also published as: CN113163481A; WO2021147898A1

Abstract

A method, a terminal and a base station for determining uplink transmission timing are provided, the method comprises: by timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant. According to the method for determining uplink transmission timing, the terminal and the base station provided by the embodiment of the invention, when the terminal sends the PUSCH or PUCCH, the terminal does not need to adopt different access processing according to the type of the terminal per se, but adopts the timing offset determined in the same mode to send the PUSCH or PUCCH, so that the same processing mode can be adopted for all terminals, the change of signaling messages in the existing random access process is avoided, and the processing processes of a network and the terminal are simplified. In addition, the embodiment of the invention can realize better balance in the aspects of reducing the random access signaling overhead and reducing the RTT.

Description

Method for determining uplink transmission timing, terminal and base station

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a method, a terminal, and a base station for determining uplink transmission timing.

Background

To meet the ubiquitous radio coverage requirement, fifth generation mobile communication (5G) systems need to support convergence of terrestrial and satellite networks. Currently, non-terrestrial networking (NTN) technologies are being studied, which are expected to achieve the following goals through satellite networks:

1) An economical and effective coverage mode is provided for un-served areas (such as ocean, airplane and underwater) in 5G deployment;

2) The reliability of the 5G network is enhanced, for example, the continuity of high-speed Machine to Machine (M2M) and Internet of things (IoT) services is improved, and communication and emergency communication guarantees in a limit environment are provided;

3) The 5G network expandability is ensured, and effective multicast/broadcast resources are provided for the network edge.

Taking Geostationary Orbit (GEO) as an example, a satellite constellation has the advantages of wide coverage of a single satellite and simple networking, for example, a single GEO satellite can cover the whole country of china, and 3 GEO satellites can realize global coverage.

Disclosure of Invention

At least one embodiment of the present invention provides a method, a terminal, and a network device for determining uplink transmission timing, which can avoid modification of a signaling message in an existing random access process, and simplify a random access processing procedure of a network and the terminal.

According to an aspect of the present invention, at least one embodiment provides a method for determining uplink transmission timing, which is applied to a terminal, and includes:

by timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the invention, the uplink transmission timing is determined according to at least one of the following modes:

if a terminal receives a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to Physical Random Access Channel (PRACH) transmission of the terminal in a time slot n, the terminal transmits a Physical Downlink Shared Channel (PDSCH) in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is slot offset (slot offset), Δ is a coefficient related to the sub-carrier of PUSCH;

if the terminal receives downlink control information DCI for scheduling PUSCH transmission in time slot n and time slot offset K is indicated in the DCI ₂ Then the terminal is in the time slot

Medium transmission PUSCH, where mu _PUSCH And mu _PDCCH Subcarrier spacing configuration (subcarrier spacing configuration) for PUSCH and PDCCH, respectively;

if the last time slot of the PDSCH received by the terminal is the time slot n, the terminal is in the time slot n + K ₁ +K _offset In transmitting PUCCH including corresponding HARQ-ACK information, wherein K ₁ Is the number of time slots;

wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the invention, the method for determining the uplink transmission timing is applied to a random access RACH process;

or, the method for determining uplink transmission timing is applied to a Radio Resource Control (RRC) connection establishment (RRC connection initialization) process.

According to at least one embodiment of the invention, the preset constants comprise at least: and adjusting the maximum value of the range by the time advance TA indicated by the RAR message.

According to at least one embodiment of the invention, the timing offset K is _offset Calculated according to the following formula:

wherein, TA _common Represents common TA; α, β and C are all constants, and C represents the maximum value of the timing advance TA adjustment range indicated by the RAR message.

According to at least one embodiment of the invention, the constants α and β are determined in one of the following ways:

if the time unit of the timing offset is a slot and the duration of each slot is 2 ^-μ Then α =1, β =1920/S;

if the default timing offset is a frame in time units and each frame is 10ms in duration, then a =1,

if the time unit of the timing offset is a single uplink and downlink switching period, and the duration of the uplink and downlink switching period is P ₁ ms, then a =1,

if the time unit of the timing offset is a combined uplink and downlink switching period, and the combined uplink and downlink switching period comprises two uplink and downlink switching periods which respectively last for P ₁ ms and P ₂ ms, then a =1,

according to at least one embodiment of the invention, after establishing the radio resource control, RRC, connection with the network, the method further comprises:

the terminal updates the timing offset K according to the indication information sent by the network _offset 。

According to at least one embodiment of the present invention, before updating the timing offset according to the indication information sent by the network, the method further comprises:

after establishing a Radio Resource Control (RRC) connection with the network, the terminal also reports one or more of the following auxiliary information to the network:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

and the reference time is the time of sending a Physical Random Access Channel (PRACH) or the time of reporting the auxiliary information.

According to another aspect of the present invention, at least one embodiment provides a method for determining uplink transmission timing, which is applied to a base station, and includes:

by timing offset K _offset Determining uplink transmission timing of a terminal, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the present invention, the uplink transmission timing of the terminal is determined according to at least one of the following modes:

if a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to Physical Random Access Channel (PRACH) transmission of the terminal is sent to the terminal in a time slot n, determining that the terminal is in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is slot offset (slot offset), Δ is a coefficient related to a subcarrier of PUSCH;

if downlink control information DCI for scheduling PUSCH transmission is sent to the terminal in the time slot n and the time slot offset K is indicated in the DCI ₂ Then determining that the terminal is in the time slot

if the last time slot of the PDSCH sent to the terminal is the time slot n, determining that the terminal is in the time slot n + K ₁ +K _offset Wherein the transmission includes PUCCH with corresponding HARQ-ACK information, wherein K ₁ Is the number of time slots;

receiving the PUSCH or PUCCH sent by the terminal according to the time slot of the PUSCH or PUCCH sent by the terminal;

wherein the timing offset K _offset Is based on the common Time Advance (TA) and the pre-advanceAnd setting a constant to be determined.

According to at least one embodiment of the present invention, the method for determining uplink transmission timing is applied to a random access RACH procedure of the terminal;

or, the method for determining uplink transmission timing is applied to a Radio Resource Control (RRC) connection establishment (RRC connection initialization) process of the terminal.

According to at least one embodiment of the invention, the timing offset K _offset Calculated according to the following formula:

wherein, TA _common Represents common TA; alpha, beta and C are all constants, and C represents the maximum value of the TA adjustment range of the time advance indicated by the RAR message.

if the time unit of the timing offset is a frame and the duration of each frame is 10ms, then a =1,

if the time unit of the timing offset is the joint uplink and downlinkA switching period, and the combined uplink and downlink switching period includes two uplink and downlink switching periods respectively lasting for P ₁ ms and P ₂ ms, then a =1,

according to at least one embodiment of the present invention, after the terminal establishes a radio resource control RRC connection with the base station, the method further includes:

sending indication information to the terminal, and updating the timing offset K _offset 。

According to at least one embodiment of the invention, before transmitting the indication information, the method further comprises:

updating the timing offset according to the complete full TA of the terminal obtained in the random access process; alternatively, the first and second electrodes may be,

after establishing Radio Resource Control (RRC) connection with the terminal, receiving auxiliary information sent by the terminal, and updating the timing offset according to the auxiliary information;

wherein the auxiliary information comprises one or more of:

a full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

the reference time is the time of sending the physical random access channel PRACH or the time of reporting the auxiliary information.

According to another aspect of the present invention, at least one embodiment provides a terminal including:

an uplink transmission timing determination module for passing a timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the present invention, the uplink transmission timing determining module is further configured to determine uplink transmission timing according to at least one of the following manners, including:

if the last time slot of the PDSCH received by the terminal is the time slot n, the terminal is in the time slot n + K ₁ +K _offset Wherein the transmission includes PUCCH with corresponding HARQ-ACK information, wherein K ₁ Is the number of slots.

Wherein, the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the present invention, the terminal further includes:

an uplink transmission timing updating module, configured to update the timing offset K according to indication information sent by the network after the terminal establishes RRC connection with the network _offset 。

According to at least one embodiment of the present invention, the uplink transmission timing update module is further configured to, before updating the timing offset according to the indication information sent by the network, report one or more of the following auxiliary information to the network after the terminal establishes a radio resource control RRC connection with the network:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

According to another aspect of the present invention, at least one embodiment provides a terminal including: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method for determining uplink transmission timing as described above.

According to another aspect of the present invention, at least one embodiment provides a base station comprising:

an uplink transmission timing determination module for passing a timing offset K _offset Determining uplink transmission timing of a terminal, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

According to at least one embodiment of the present invention, the uplink transmission timing determining module is further configured to determine the uplink transmission timing of the terminal according to at least one of the following manners:

if a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to Physical Random Access Channel (PRACH) transmission of the terminal is sent to the terminal in a time slot n, determining that the terminal is in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is slot offset (slot offset), Δ is a coefficient related to the sub-carrier of PUSCH;

Medium transmission PUSCH, where _PUsCH And mu _PDCCH Subcarrier spacing configuration (subcarrier spacing configuration) for PUSCH and PDCCH, respectively;

a receiving module, configured to receive a PUSCH or PUCCH transmitted by the terminal according to a slot in which the terminal transmits the PUSCH or PUCCH;

According to at least one embodiment of the present invention, the base station further includes:

an uplink transmission timing update module, configured to send indication information to the terminal after the base station establishes RRC connection with the terminal, and update the timing offset K _offset 。

an update value calculation module to:

wherein the auxiliary information comprises one or more of:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

According to another aspect of the present invention, at least one embodiment provides a base station comprising: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method for determining uplink transmission timing as described above.

According to another aspect of the invention, at least one embodiment provides a computer-readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.

Compared with the prior art, according to the method for determining uplink transmission timing, the terminal and the base station provided by the embodiment of the invention, when the terminal sends the PUSCH or PUCCH, the terminal does not need to adopt different access processing according to the terminal type (whether the terminal has the capability of automatically estimating TA) of the terminal, but adopts the timing offset determined in the same mode to send the PUSCH or PUCCH, so that the same processing mode can be adopted for all terminals, the change of signaling messages in the existing random access process is avoided, and the processing processes of the network and the terminal are simplified. In addition, the embodiment of the invention can realize better balance in the aspects of reducing the random access signaling overhead and reducing the RTT.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a flowchart of a method for determining uplink transmission timing according to an embodiment of the present invention, applied to a terminal side;

FIG. 2 is an exemplary graph of timing offset versus K2 dynamic range;

FIG. 3 is an exemplary graph of timing offset versus RTT;

fig. 4 is a flowchart of a method for determining uplink transmission timing according to an embodiment of the present invention, when the method is applied to a base station side;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 8 is another schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

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

The techniques described herein are not limited to NR systems and Long Time Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A and GSM are described in the literature from an organization named "third Generation Partnership project" (3 rd Generation Partnership project,3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3 GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

As described in the background art, the GEO satellite constellation has the advantages of wide single-satellite coverage and simple networking. However, the GEO satellite propagation delay is large and the real-time service experience is poor due to the limitation of a large orbit height (35786 km). Particularly, when the GEO satellite adopts a bent pipe forwarding (bent pipe) communication mode, the ground user signal firstly arrives at the GEO satellite and then is forwarded to the ground gateway through the GEO satellite. Through evaluation, considering the signal processing delay of each device, the two-way communication delay (UE → GEO → terrestrial gateway → GEO → UE) of the GEO network using the bent pipe forwarding mode is about 544.8ms or more.

In existing signaling messages designed for terrestrial networks, for example, some timing relationships are explicitly indicated in some fields of Downlink Control Information (DCI), including:

k0: a slot offset between a Downlink grant DCI (DL grant DCI) to a scheduled Physical Downlink Shared CHannel (PDSCH). K0 has a value range of 0, \ 8230;, 32;

k1: slot offset between PDSCH to hybrid automatic repeat request response (HARQ-ACK) feedback. K1 has a value range of 0, \ 8230;, 15;

k2: a slot offset between an Uplink grant DCI (UL grant DCI) to a scheduled Physical downlink Shared CHannel (PUSCH). K2 has the value range of 0, \ 8230;, 32.

In the NTN scenario, in consideration of the large time delay between satellites and the ground, many timing parameters (such as K1 and K2 above) in the prior art are not enough in value range.

For example, K1 is used to indicate the slot offset between PDSCH to HARQ feedback. It is assumed that the base station schedules the PDSCH in slot n by DCI indication. Ground UE at time slot n + tau _delay Can receive PDSCH transmitted by a base station, wherein tau _delay Representing the propagation delay between the satellite and the ground. For GEO satellites, τ _delay Is more than or equal to 120ms. The decoding delay and TA processing of the UE side are temporarily not considered, and the HARQ-ACK feedback is supposed to be sent by the UE immediately after the received PDSCH, and the HARQ-ACK also needs to be transmitted by tau _delay It is not until time before it reaches the satellite. This means that at least 2 τ needs to pass between sending the PDSCH from the base station and receiving the HARQ-ACK fed back by the UE _delay The time interval of (c). For GEO satellites, the time interval is at least 240ms. Considering a 30kHz subcarrier spacing, each slot lasts 0.5ms, then a 240ms time interval corresponds to 480 slots (slots). Obviously, 480 is far beyond the parameter value of K1 in the prior artAnd (3) a range.

In view of the above problems, one solution is: instead of modifying the range of values of K1 or K2, which is already known in the prior art, a new parameter is introduced, for example, the timing offset K _offset . At this time:

slot offset = K between PDSCH to HARQ-ACK feedback _offset +K1；

Slot offset = K between UL grant DCI to scheduled PUSCH _offset +K2。

At present, the prior art does not yet provide the above K _offset A method for determining the value of (1). One possible way is to configure K directly through higher layer signaling _offset And (4) taking a value. High-level signaling direct configuration K _offset The precondition of the value is that: the base station needs to know the propagation distance between the base station and the terminal (the propagation distance can be determined by the propagation delay τ) _delay To) and configure K) and _offset so that it is at least 2 times greater than τ _delay . When the base station is on the ground, the transmission delay of the ground base station and the terminal usually includes the delay from the base station to the satellite and then to the terminal; when the base station is located on the satellite side (e.g., low earth orbit satellite), the transmission delay from the base station to the terminal may generally include the base station to terminal delay.

The new air interface (NR) system supports both a 4-step Random Access (RACH) procedure and a 2-step random access procedure. Wherein, the 4-step random access process comprises:

1) UE sends message 1 (Msg 1) of 4-step random access process, namely PRACH channel;

2) After receiving the Msg 1, the gNB sends a message 2 (Msg 2) of a 4-step random access process, namely a Random Access Response (RAR) message;

3) The UE receives the Msg 2 and sends a message 3 (Msg 3) of a 4-step random access process according to scheduling information carried in the Msg 2;

4) And the base station receives the Msg 3, sends a message 4 (Msg 4) of the 4-step random access process and completes the random access process.

In the 2 nd step and the 4 th step of the 4-step random access procedure, when the UE receives the Msg 1 or Msg 3, HARQ-ACK needs to be fed back.

The 2-step random access process comprises the following steps:

1) UE firstly sends a message A (Msg A) of a 2-step random access process;

2) And after receiving the Msg A, the gNB sends a message B (Msg B) of the 2-step random access process and completes the random access process.

In the 2 nd step of the 2-step random access procedure, when the UE receives the Msg B, HARQ-ACK needs to be fed back.

It can be seen that, in step 2 of the 4-step random access procedure, K is needed to be used when the UE determines the RAR message listening window timing _offset Configuring; in addition, in step 2 and step 4, the UE also needs to use K to determine the HARQ-ACK feedback timing of Msg 1 and Msg 3 _offset And (4) configuring. In step 2 of the 2-step random access procedure, the UE also needs to use K to determine the time of the RAR message listening window and the HARQ-ACK feedback timing of Msg a _offset And (4) configuring.

In addition, in the NTN system, there are generally two types of terminal types. Wherein the content of the first and second substances,

terminals (UEs) of the first type have Global Navigation Satellite System (GNSS) positioning capabilities and are capable of determining the position of satellites by ephemeris. Therefore, the first type of terminal can automatically estimate a Timing Advance (TA) and perform pre-compensation in Advance when sending PRACH (corresponding to Msg 1 in a 4-step random access procedure or Msg a in a 2-step random access procedure). That is, the first type of terminal is a terminal having the capability of automatically estimating TA.

The second type of terminal cannot automatically estimate the TA before sending the PRACH, that is, the second type of terminal is a terminal without the capability of automatically estimating the TA. For such terminals, the base station may indicate a common timing advance (common TA) via a system message. When all terminals in the same cell or beam transmit PRACH, TA pre-compensation is performed through common TA.

Note that for the second class of terminals, the terminal performs TA pre-compensation according to common TA indicated by the base station. When receiving the PRACH channel transmitted by the second class of terminals, the base station knows how much (common TA) the terminal has compensated. Then combining TA residue measured at the base station sideOffset, the propagation distance tau between the base station and the terminal can be determined _delay What is. In this case, the base station may be based on τ _delay Determining a timing offset K _offset And configures its bearer to the terminal in a RAR response message.

However, for the first type of terminal, the terminal performs TA pre-compensation according to its own position and satellite ephemeris. The base station cannot know how much TA the terminal compensates. When the base station receives the PRACH channel sent by the second type of terminal, the base station can only determine how much TA of the terminal needs to be adjusted based on the measured TA residual offset, but cannot determine the propagation distance τ between the base station and the terminal _delay Is what. In this case, it is difficult for the base station to determine the timing offset K _offset Are suitably selected.

In order to solve the above problem, the present application provides a method for determining uplink transmission timing, which may simplify the configuration of a timing offset, and may better balance the influence of the timing offset on the random access signaling overhead and Round Trip Time (RTT). Referring to fig. 1, a method for determining uplink transmission timing provided in an embodiment of the present invention is applied to a terminal, and includes:

step 11, by timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

Here, the uplink transmission timing may include uplink transmission timing of a PUSCH or a PUCCH, and a timing offset in the uplink transmission timing is determined according to a universal time advance and a preset constant.

According to at least one embodiment of the present invention, the uplink transmission timing may be determined according to at least one of the following ways:

if a terminal receives a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to Physical Random Access Channel (PRACH) transmission of the terminal in a time slot n, the terminal transmits a Physical Downlink Shared Channel (PDSCH) in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is a time slot offsetShift (slot offset), Δ, by a coefficient related to a subcarrier of PUSCH;

Here, the timing offset K _offset Can be determined according to the common time advance common TA and the preset constant. common TA is the universal timing advance. Generally, the base station may select a reference point within each cell or beam coverage area and determine common TA based on the propagation delay to the satellite from the reference point. The base station may notify the common TA to all terminals under the corresponding cell or beam through a system message.

Through the above manner, when the terminal of the embodiment of the invention sends the PUSCH or PUCCH, different access processing does not need to be adopted according to the type of the terminal (whether the terminal has the capability of automatically estimating the TA) of the terminal, but the PUSCH or PUCCH is sent by adopting the timing offset determined in the same manner, so that the same processing manner can be adopted for all terminals, the change of signaling messages in the existing random access process is avoided, and the processing processes of a network and the terminal are simplified.

According to at least one embodiment of the invention, the preset constants comprise at least: and the maximum value of the TA adjustment range indicated by the RAR message.

In the embodiment of the present invention, the default timing offset may be determined according to the common TA and the maximum value of the TA adjustment range of the timing advance indicated by the RAR message.

Analysis according to the preambleTiming offset K _offset Propagation delays tau of base stations and terminals which need to be greater than or equal to 2 times _delay . Note that the full TA equals 2 times the delay τ _delay Namely:

full TA＝2τ _delay

the timing offset K is further described below by taking the timing relationship between the UL grant DCI and the scheduled PUSCH as an example _offset The impact of (c) on the network's normal operation and RTT.

In NR systems, the slot offset between UL grant DCI to scheduled PUSCH is denoted as K2. When introducing K _offset Time slot offset between UL grant DCI to scheduled PUSCH = K _offset + K2. Note that the time interval (T1) between the UL grant DCI to the scheduled PUSCH should be greater than or equal to full TA, meaning:

T1＝K _offset +K2≥full TA

if K is _offset <full TA, K2 is required to be more than or equal to full TA-K _offset ＞0。

Note that in the prior art, K2 is typically set<15. If full TA-K _offset > 15, this would result in K2 > 15, and thus potentially in K2 values outside of what it could indicate.

Based on the above analysis, please refer to FIG. 2, if K _offset Less than full TA, the indicated range of uplink timing (UL timing) may be exceeded, resulting in the NTN network not working properly. Note that, in fig. 2 to 3, the timing offset amount K is represented by K _ offset _offset And P represents an uplink and downlink switching period.

On the contrary, as shown in FIG. 3, when K is _offset When the value is larger than full TA, the NTN network can work normally, but K is increased _offset While increasing the RTT delay.

For example, if K _offset If it is greater than full TA, K2 is required to be greater than or equal to (full TA-K) _offset ) And (full TA-K) _offset )<0. Therefore, as long as K _offset Is greater than full TA, the value range of K2 in the prior art does not need to be expanded, and the K2 can be normally used. K _offset Greater than full TAThe cost is an increase in data round trip delay (RTT).

The method for determining uplink transmission timing provided by the embodiment of the invention can be applied to a Random Access Channel (RACH) process, or can be applied to a Radio Resource Control (RRC) connection establishment (RRC connection initialization) process.

Based on the above analysis, in the random access phase, for the first type of terminal, the base station cannot accurately know the propagation distance τ between the base station and the terminal _delay Is large, and therefore, a timing offset K of a large value can be used _offset And the maximum full TA is larger than or equal to the maximum full TA so as to ensure that the network can work normally.

In particular, since the random access phase is only a one-time short process, and the overall impact on the network is small, it may not be necessary to optimize the RTT delay of the random access phase.

Based on the above considerations, no matter whether the base station can distinguish the two terminal types at the random access stage, the base station and the terminal of the embodiment of the present invention determine the timing offset K in an implicit manner _offset And K is _offset Can be determined according to the maximum value of TA adjusting range indicated by common TA and RAR to ensure that K is ensured _offset Greater than or equal to the maximum value of full TA for all terminals under the corresponding cell or beam.

One way to calculate the above-mentioned timing offset is provided below:

wherein, TA _common Represents common TA; α, β and C are all constants.

For example, C may be the maximum value of the timing advance TA adjustment range indicated by the RAR message. For example, in the prior art, the RAR carries T _A Field, wherein T _A 3846. Then C =3846.

For example, α represents a conversion coefficient of a time unit of C with respect to a time unit of common TA, and β represents K _offset When (2)Conversion coefficient of the inter unit with respect to the unit of common TA; operator character

Represents upper rounding, K _offset Indicating a default timing offset.

In some embodiments of the invention, TA _common Time unit of (1) and T _A Are the same and are S.16.64/2 ^μ ·T _c Second, where, T _c ＝1/(Δf _max ·N _f )，Δf _max ＝480·10 ³ Hz，N _f =4096. Mu is a subcarrier spacing (SCS) configuration parameter, and the subcarrier spacing is 2 mu.15 kHz. S is a TA scaling factor, specifically a positive integer greater than or equal to 1.

In the above-described embodiment of the present invention,

suppose K _offset Has a time unit of slots, each slot having a duration of 2 ^-μ ms. In particular, when SCS =15kHz, μ =0, each slot duration is 1ms. Then in this embodiment it is possible that,

specifically, when S =1, β =1920.

In other embodiments, assume K _offset Is a frame (frrame) and each slot (slot) has a duration of 10ms, then

In other embodiments, assume K _offset The time unit of (a) is an uplink-downlink period (ul-dl) or a combined uplink-downlink period (combined ul-dl). In particular, it is possible to use, for example,

when the network adopts a single uplink and downlink switching period, the uplink and downlink switching period lastsP ₁ In the time of ms, the time of the second,

the time unit of (1) is an uplink and downlink switching period and lasts for P ₁ ms；

When the network adopts two uplink and downlink switching periods, and the two uplink and downlink switching periods respectively last for P ₁ ms and P ₂ ms time, K _offset The time unit of (A) is a combined uplink and downlink switching period, lasting P ₁ +P ₂ ms。

In the above-described embodiment of the present invention,

wherein, P ₁ And P ₂ In ms, the duration of the first and second uplink/downlink switching periods, respectively.

In the embodiment of the present invention, after the terminal establishes RRC connection with the network, the network may further update the timing offset and send indication information to the terminal, so that the terminal updates the timing offset K according to the indication information sent by the network _offset 。

For example, after the RRC connection is established, the base station may update the value of the more accurate timing offset to the terminal according to the terminal type and/or according to the terminal report information.

For example, for the second type of terminal, the base station may grasp full TA information during the random access process, and therefore, it is not necessary for the terminal to report any information, and it is possible to indicate a more accurate K _offset And (4) taking a value.

For the first type of terminals, the base station does not know full TA information during the random access process, so after the RRC connection is established, the base station may instruct the terminal to report some necessary information. Then, the base station calculates more accurate K based on the information reported by the terminal _offset And taking values and configuring the values to the terminal through high-level signaling.

Specifically, before receiving the updated value of the timing offset sent by the network, the terminal may report one or more of the following auxiliary information to the network after establishing a radio resource control RRC connection with the network:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

the reference time is a time for transmitting a Physical Random Access Channel (PRACH) or a time for reporting the auxiliary information.

Still taking fig. 3 as an example, the terminal finds the K indicated by the base station _offset When the value is larger, K can be further compressed _offset Taking values and updating K according to the following mode _offset ＝K _offset -P. Here, P denotes an uplink and downlink switching period.

It can be seen from the above description that, in the application of timing offset, the embodiment of the present invention employs a two-stage timing offset K _offset A configuration mode, wherein in the random access process, a default value of a timing offset is adopted, wherein the timing offset can be determined according to TA indication ranges in common TA and RAR; after the RRC connection is established, for the first terminal, the base station may update and indicate an updated value of the timing offset based on the terminal report information. Through the two-stage timing offset configuration, the embodiment of the invention can realize better balance in the aspects of reducing the random access signaling overhead and reducing the RTT.

The method of the embodiment of the present invention is explained above from the terminal side. The method of the embodiments of the present invention is further described from the base station side.

Referring to fig. 4, when the method for determining uplink transmission timing provided in the embodiment of the present invention is applied to a base station side, the method includes:

step 41, by timing offset K _offset Determining uplink transmission timing of a terminal, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

Specifically, the uplink transmission timing of the terminal may be determined according to at least one of the following manners:

if a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to the PRACH transmission of the terminal is sent to the terminal in a time slot n, determining that the terminal is in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is slot offset (slot offset), Δ is a coefficient related to a subcarrier of PUSCH;

if the last time slot of the PDSCH sent to the terminal is the time slot n, determining that the terminal is in the time slot n + K ₁ +K _offset In transmitting PUCCH including corresponding HARQ-ACK information, wherein K ₁ Is the number of slots.

Through the above manner, when the terminal of the embodiment of the present invention sends the PUSCH, different access processing does not need to be adopted according to the terminal type (whether the terminal has the capability of automatically estimating the TA), but the terminal sends the PUSCH or the PUCCH by using the timing offset determined in the same manner, so that the same processing manner can be adopted for all terminals, thereby avoiding the modification of the signaling message in the existing random access process, and simplifying the processing processes of the network and the terminal.

Further, after step 41, the base station may determine a slot in which the terminal transmits the PUSCH or PUCCH according to the uplink transmission timing, and receive the PUSCH or PUCCH transmitted by the terminal.

In the embodiment of the present invention, the timing offset may be determined according to the maximum value of the TA adjustment range of the timing advance indicated by the common TA and RAR messages. For a specific calculation method, reference may be made to the above description, which is not repeated herein.

The method for determining uplink transmission timing provided above may be applied to a random access RACH procedure of the terminal, or to a radio resource control RRC connection establishment (RRC connection establishment) procedure of the terminal.

After the base station establishes the RRC connection with the terminal, the base station may also send indication information to the terminal to update the timing offset K _offset 。

Specifically, the timing offset K _offset Different updating modes can be provided for different terminal types:

for example, for a second type of terminal, the base station may update the timing offset according to full TA of the terminal obtained in a random access procedure;

for a first type of terminal, after establishing a radio resource control RRC connection with the terminal, a base station may receive auxiliary information sent by the terminal, and update the timing offset according to the auxiliary information. Wherein the auxiliary information comprises one or more of:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

the reference time is the time of sending the PRACH or the time of reporting the auxiliary information.

Various methods of embodiments of the present invention have been described above. An apparatus for carrying out the above method is further provided below.

Referring to fig. 5, an embodiment of the present invention provides a terminal 50, including:

an uplink transmission timing determining module 51 for determining the uplink transmission timing by a timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

Optionally, the uplink transmission timing determining module 51 is further configured to determine the uplink transmission timing according to at least one of the following manners, including:

Optionally, the method for determining uplink transmission timing is applied to a random access RACH process;

or, the method for determining uplink transmission timing is applied to a Radio Resource Control (RRC) connection initialization (RRC connection initialization) process.

Optionally, the preset constant at least includes: and adjusting the maximum value of the range by the time advance TA indicated by the RAR message.

Optionally, the timing offset K _offset Calculated according to the following formula:

Optionally, the uplink transmission timing determining module determines the constants α and β by using one of the following methods:

optionally, the terminal further includes:

Optionally, the uplink transmission timing updating module is further configured to, before updating the timing offset according to the indication information sent by the network, report one or more of the following auxiliary information to the network after the terminal establishes a radio resource control RRC connection with the network:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

Referring to fig. 6, a schematic structural diagram of a terminal according to an embodiment of the present invention is shown, where the terminal 600 includes: a processor 601, a transceiver 602, a memory 603, a user interface 604 and a bus interface.

In this embodiment of the present invention, the terminal 600 further includes: a program stored in the memory 603 and executable on the processor 601.

The processor 601, when executing the program, implements the following steps:

It can be understood that, in the embodiment of the present invention, when the computer program is executed by the processor 601, each process of the embodiment of the method for determining uplink transmission timing shown in fig. 1 can be implemented, and the same technical effect can be achieved.

In fig. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, in particular, one or more processors, represented by processor 601, and memory, represented by memory 603. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 602 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 604 may also be an interface capable of interfacing externally to a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 601 is responsible for managing the bus architecture and general processing, and the memory 603 may store data used by the processor 601 in performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of:

An embodiment of the present invention provides a base station 70 shown in fig. 7, including:

an uplink transmission timing determination module 71 for determining the timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance common TA and a preset constant

Optionally, the uplink transmission timing determining module 71 is further configured to determine the uplink transmission timing of the terminal according to at least one of the following modes:

if the last time slot of the PDSCH sent to the terminal is the time slot n, determining that the terminal is in the time slot n + K ₁ +K _offset In transmitting PUCCH including corresponding HARQ-ACK information, wherein K ₁ Is the number of time slots;

Optionally, the method for determining uplink transmission timing is applied to a random access RACH procedure of the terminal;

if the time unit of the timing offset is a joint uplink and downlink switching period, and the joint uplink and downlink switching period comprises two uplink and downlink switching periods which respectively last for P ₁ ms and P ₂ ms, then a =1,

optionally, the base station further includes:

Optionally, the base station further includes:

an update value calculation module to:

wherein the auxiliary information comprises one or more of:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

Referring to fig. 8, an embodiment of the present invention provides a structural diagram of a base station 800, including: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:

in this embodiment of the present invention, the base station 800 further includes: a program stored on the memory 803 and executable on the processor 801, which when executed by the processor 801, performs the steps of:

determining uplink transmission timing of a terminal, wherein the uplink transmission timing comprises a timing offset K _offset The timing offset K _offset Is determined according to the common time advance common TA and a preset constant.

It can be understood that, in the embodiment of the present invention, when being executed by the processor 801, the computer program can implement each process of the embodiment of the method for determining uplink transmission timing shown in fig. 4, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 803, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 802 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, the program when executed by a processor implementing the steps of:

When executed by the processor, the program can implement all implementation manners in the method for determining uplink transmission timing applied to the base station side, and can achieve the same technical effect, and is not described herein again to avoid repetition.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for determining uplink transmission timing is applied to a terminal, and is characterized by comprising the following steps:

by timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance TA and a preset constant;

wherein the timing offset K _offset Calculated according to the following formula:

wherein, TA _common Denotes common TA; alpha, beta and C are constants, and C represents the maximum value of the TA adjustment range indicated by the RAR message;

wherein the constants α and β are determined in one of the following ways:

if the default timing offset is a slot and the duration of each slot is 2 ^-μ Then α =1, β =1920/S;

if the default timing offset is a frame in time units and each frame is 10ms in duration, α =1,

if the time unit of the default timing offset is a single uplink and downlink switching period, and the duration of the uplink and downlink switching period is P ₁ ms, then a =1,

if the default time unit of the timing offset is a combined uplink and downlink switching period, the combined uplink and downlink switching period comprises two uplink and downlink switching periods which respectively last for P ₁ ms and P ₂ ms, then a =1,

wherein S is TA scaling factor, mu is SCS configuration parameter of subcarrier spacing, T _c ＝1/(Δf _max ·N _f )，Δf _max ＝480·10 ³ Hz，N _f ＝4096。

2. The method of claim 1,

determining the uplink transmission timing according to at least one of the following modes:

if a terminal receives a physical downlink shared channel PDSCH containing a random access response RAR message corresponding to the terminal's physical random access channel PRACH transmission at time slot n,the terminal is in time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is the slot offset, Δ is a coefficient related to the sub-carrier of the PUSCH;

Medium transmission PUSCH, where _PUSCH And mu _PDCCH Respectively configuring the subcarrier intervals of the PUSCH and the PDCCH;

3. The method of claim 1 or 2,

the method for determining the uplink transmission timing is applied to the random access RACH process;

or, the method for determining uplink transmission timing is applied to the process of establishing Radio Resource Control (RRC) connection.

4. The method of claim 1 or 2, wherein after establishing a radio resource control, RRC, connection with a network, the method further comprises:

5. The method of claim 4, wherein prior to updating the timing offset based on the indication information sent by the network, the method further comprises:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

the reference time is a time for sending a Physical Random Access Channel (PRACH) or a time for reporting the auxiliary information.

6. A method for determining uplink transmission timing is applied to a base station, and is characterized by comprising the following steps:

by timing offset K _offset Determining uplink transmission timing of a terminal, wherein the timing offset K _offset Is determined according to the common time advance TA and a preset constant;

wherein, TA _common Represents common TA; alpha, beta and C are constants, and C represents the maximum value of the TA adjustment range indicated by the RAR message;

wherein the constants α and β are determined in one of the following ways:

if the default timing offset is in frame frames, and each frame is 10ms in duration, α =1,

if the time unit of the default timing offset is a joint uplink and downlink switching period, and the joint uplink and downlink switching period comprises two uplink and downlink switching periods and respectively lasts for P ₁ ms and P ₂ ms, then a =1,

7. The method of claim 6,

determining the uplink transmission timing of the terminal according to at least one of the following modes:

if a Physical Downlink Shared Channel (PDSCH) containing a Random Access Response (RAR) message corresponding to the PRACH transmission of the terminal is sent to the terminal in a time slot n, determining that the terminal is in a time slot n + K ₂ +Δ+K _offset Medium transmission physical uplink shared channel PUSCH, where K ₂ Is the slot offset, Δ is a coefficient related to the sub-carrier of the PUSCH;

8. The method of claim 6 or 7,

the method for determining the uplink transmission timing is applied to the random access RACH process of the terminal;

or, the method for determining the uplink transmission timing is applied to a Radio Resource Control (RRC) connection establishment process of the terminal.

9. The method according to claim 6 or 7, wherein after the terminal establishes a radio resource control, RRC, connection with a base station, the method further comprises:

10. The method of claim 9, wherein prior to sending the indication information, the method further comprises:

wherein the auxiliary information comprises one or more of:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

11. A terminal, comprising:

uplink transmission timing determinationModule for passing a timing offset K _offset Determining uplink transmission timing, wherein the timing offset K _offset Is determined according to the common time advance TA and a preset constant;

the uplink transmission timing determining module determines the constants α and β by using one of the following methods:

wherein S isTA scaling factor, μ subcarrier spacing SCS configuration parameter, T _c ＝1/(Δf _max ·N _f )，Δf _max ＝480·10 ³ Hz，N _f ＝4096。

12. The terminal of claim 11, further comprising:

an uplink transmission timing update module, configured to update the timing offset K according to indication information sent by the network after the terminal establishes RRC connection with the network _offset 。

13. The terminal of claim 12,

the uplink transmission timing updating module is further configured to, before updating the timing offset according to the indication information sent by the network, report one or more of the following auxiliary information to the network after the terminal establishes an RRC connection with the network:

a full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

14. A terminal, comprising: processor, memory and program stored on said memory and executable on said processor, said program when executed by said processor implementing the steps of the method for determining timing of uplink transmissions according to any of claims 1 to 5.

15. A base station, comprising:

an uplink transmission timing determination module for passing a timing offset K _offset Determining uplink transmission timing of a terminal, wherein the timing offset K _offset The method is determined according to the common TA and a preset constant;

16. The base station of claim 15, further comprising:

17. The base station of claim 16, further comprising:

an update value calculation module to:

wherein the auxiliary information comprises one or more of:

full TA at the reference time;

a difference TA of full TA with respect to common TA at the reference time;

18. A base station, comprising: processor, memory and program stored on said memory and executable on said processor, said program when executed by said processor implementing the steps of the method for determining timing of uplink transmissions according to any of claims 6 to 10.

19. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, implements the steps of the method for determining uplink transmission timing according to any one of claims 1 to 10.