CN115835404A

CN115835404A - Method, device, terminal and equipment for determining random access channel opportunity

Info

Publication number: CN115835404A
Application number: CN202111110170.1A
Authority: CN
Inventors: 丁勇; 云翔
Original assignee: Baicells Technologies Co Ltd
Current assignee: Baicells Technologies Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-03-21

Abstract

The invention provides a method, a device, a terminal and equipment for determining random access channel opportunity, and relates to the technical field of communication. The method is applied to a terminal side and comprises the steps of receiving a downlink Synchronous Signal Block (SSB) sent by a network side, wherein the downlink SSB carries an SSB index; receiving a Random Access Channel (RACH) configuration indication index sent by a network side, wherein the RACH configuration indication index is used for indicating a terminal to acquire time domain position configuration information of an uplink random access channel (RO), and an SSB index is associated with the time domain position configuration information of the uplink RO; determining the time domain position of the uplink RO corresponding to the downlink SSB according to the SSB index and the RACH configuration indication index; wherein, the offset value is arranged between the sending time of the downstream SSB and the receiving time of the upstream RO of the same wave bit. The scheme of the invention can avoid the problems that the network can not effectively distribute the RO and the terminal can not use the RO in a conventional mode due to the overlarge air interface transmission time delay in the NTN of the non-ground network and the resource waste is excessive due to the overlarge RO window.

Description

Method, device, terminal and equipment for determining random access channel opportunity

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a terminal, and a device for determining a random access channel opportunity.

Background

In order to meet the challenges brought by the rapid increase of wireless data service demands and new service demands, non-Terrestrial Networks (NTN) and particularly satellite communication become important technologies in the field of mobile communication. When a terminal initiates a random access procedure, a satellite must perform connection reception at a suitable random access time (RACH occupancy, abbreviated as RO) to complete a corresponding random access procedure. The random access procedure in NR uses beams, where a Synchronization Signal Block (SSB) has multiple transmission opportunities in a time domain period and corresponding numbers, which may correspond to different beams, respectively, and for a UE, the UE has an opportunity to transmit a preamble only after a beam scanning Signal of the SSB covers the UE. When the network receives the preamble of the UE, it knows the downlink best beam, in other words, it knows which beam points to the UE, so the SSB needs to have a correlation with the preamble, and the preambles can be sent only in PRACH occasion, so the SSB is correlated with the PRACH occasion.

However, since Round-Trip Time (RTT) of the satellite-to-ground link is greater than the dwell Time of satellite beam scanning, the current scheme for allocating and determining the random access Time of the 5G NR may cause the terminal to fail to obtain valid RO, and cause excessive resource waste due to an excessively large RO window.

Disclosure of Invention

The invention aims to provide a method, a device, a terminal and equipment for determining a random access opportunity, which solve the problems that the terminal cannot obtain effective RO and resources are wasted too much due to overlarge RO window caused by the conventional scheme for allocating and determining the random access opportunity of 5G NR.

In a first aspect, to achieve the above object, an embodiment of the present invention provides a method for determining a random access channel opportunity, which is applied to a terminal side, and includes:

receiving a downlink Synchronization Signal Block (SSB) sent by a network side, wherein the downlink SSB carries an SSB index;

receiving a Random Access Channel (RACH) configuration indication index sent by a network side, wherein the RACH configuration indication index is used for indicating a terminal to acquire time domain position configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain position configuration information of the uplink RO;

determining the time domain position of the uplink RO corresponding to the downlink SSB according to the SSB index and the RACH configuration indication index; wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

In a second aspect, to achieve the above object, an embodiment of the present invention provides a method for determining a random access channel opportunity, which is applied to a network side, and includes:

sending a downlink synchronous signal block SSB to each wave bit in a satellite coverage area, wherein the downlink SSB carries an SSB index;

sending Random Access Channel (RACH) configuration indication information to each wave bit in a satellite coverage area, wherein the RACH configuration indication index is used for indicating a terminal to acquire time domain position configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain position configuration information of the uplink RO;

wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

In a third aspect, to achieve the above object, an embodiment of the present invention provides an apparatus for determining a random access channel opportunity, where the apparatus is applied to a terminal side, and the apparatus includes:

a first receiving module, configured to receive a downlink synchronization signal block SSB sent by a network side, where the downlink SSB carries an SSB index;

a second receiving module, configured to receive a random access channel RACH configuration indication index sent by a network side, where the RACH configuration indication index is used to indicate a terminal to obtain time domain location configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain location configuration information of the uplink RO;

a determining module, configured to determine, according to the SSB index and the RACH configuration indication index, a time domain position of the uplink RO corresponding to the downlink SSB; wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

In a fourth aspect, to achieve the above object, an embodiment of the present invention provides an apparatus for determining a random access channel opportunity, applied to a network side, including:

the first sending module is used for sending a downlink synchronous signal block SSB to each wave position in a satellite coverage area, wherein the downlink SSB carries an SSB index;

a second sending module, configured to send random access channel RACH configuration indication information to each wave site in a coverage area of a satellite, where the RACH configuration indication index is used to indicate a terminal to obtain time domain location configuration information of an uplink random access channel opportunity RO, and the SSB index is associated with the time domain location configuration information of the uplink RO; wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

In a fifth aspect, to achieve the above object, an embodiment of the present invention provides a terminal, including: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the processor, when executing the program or instructions, implements a method of determining random access channel occasions as described in the first aspect.

In a sixth aspect, to achieve the above object, an embodiment of the present invention provides an access network device, including: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the processor, when executing the program or instructions, implements a method of determining random access channel occasions as described in the second aspect.

In a seventh aspect, to achieve the above object, an embodiment of the present invention provides a readable storage medium, on which a program or an instruction is stored, and the program or the instruction, when executed by a processor, implements the method for determining a random access channel opportunity according to the first aspect or the second aspect.

The technical scheme of the invention has the following beneficial effects:

in the method of the embodiment of the invention, a terminal obtains a downlink SSB (synchronization signal block) index carried by the downlink SSB by receiving the SSB sent by a network side; receiving a Random Access Channel (RACH) configuration indication index sent by a network side, wherein the RACH configuration indication index is used for indicating a terminal to acquire time domain position configuration information of uplink random access channel (RO), and an SSB index is associated with the time domain position configuration information of the uplink RO; further, the time domain position of the uplink RO corresponding to the downlink SSB can be determined according to the SSB index and the RACH configuration indication index; therefore, by designing the time delay of the uplink and downlink beam scanning time at the same beam dwell position, the transmission waiting time delay of the uplink and downlink signaling (including the RO) of the user in the same beam position can be reduced, and the problems that the terminal cannot obtain the effective RO and the resource waste is excessive due to the overlarge RO window caused by the conventional scheme of 5G NR distribution and random access opportunity determination are solved.

Drawings

FIG. 1 is a schematic diagram of ephemeris information according to an embodiment of the invention;

FIG. 2 is a diagram illustrating a round trip time RTT calculation according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for determining random access channel timing according to an embodiment of the present invention;

fig. 4 is a schematic diagram of time domain offsets of uplink and downlink beams according to an embodiment of the present invention;

fig. 5 is a second schematic diagram of time domain shifting of uplink and downlink beams according to the embodiment of the present invention;

FIG. 6 is a diagram illustrating the distribution of RO during the same bit of dwell time according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a process of determining a time domain location of an RO according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating a correspondence relationship between SSBs and ROs according to an embodiment of the present invention;

FIG. 9 is a second schematic diagram illustrating a corresponding relationship between SSB and RO according to the embodiment of the present invention;

FIG. 10 is a third exemplary diagram illustrating a correspondence relationship between SSBs and ROs according to the embodiment of the present invention;

fig. 11 is a second flowchart of a method for determining random access channel timing according to an embodiment of the present invention;

fig. 12 is one of the structural diagrams of the apparatus for determining random access channel timing according to the embodiment of the present invention;

fig. 13 is a second block diagram of an apparatus for determining random access channel timing according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present invention;

fig. 15 is a schematic diagram of a hardware structure of an access network device according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

In addition, the terms "system" and "network" are often used interchangeably herein.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Hereinafter, technical terms referred to in the present application will first be briefly described.

1. The present application relates to the division of a satellite-to-ground link round trip time RTT measurement into three parts, respectively the maximum RTT (T) of the satellite coverage area _max ) RTT (T) of the sub-satellite point _min ) And at downstream receiving usersActual RTT (

Wherein i =1,2.. Denotes the ith SSB).

Wherein, T _max 、T _min Can be based on the satellite beam depression angle theta, the satellite height h and the constant earth radius h in the ephemeris information as shown in figure 2 _e And calculating the electromagnetic wave propagation speed c, specifically:

T _max the calculation of (A) requires the calculation of the geocentric angle

Then T at this time _max The corresponding satellite-ground distance can be expressed as

Then it can be obtained

And then

And the actual at the downstream receiving user

As shown in fig. 3, the satellite and the user terminal UE obtain local time service through a global navigation satellite system GNSS, and the time service offset is set to E. t is t ₁ At the moment, the satellite downlink scanning beam sends SSB with time information (the time information can indicate the sending time explicitly or implicitly) to the UE, and when the ground UE receives the SSB, the ground UE receives the SSB according to the time information and the local receiving time t ₂ Calculating the round trip time RTT:

2. RACH parameter configuration

According to RACH parameter multiplexing in the existing 5G protocol, the basic format is shown in the following table, i.e. after a guard interval, one CP plus a preamble sequence repeated several times.

CP

Leader sequence

......

GT

Two major types of channel formats, long and short, are supported in the 5G NR, and their sequence lengths are 839 and 139, respectively, where the long format channel format is only used for FR1, and the short format can be used for not only FR1 but also FR2, so that since the short format channel format can support a larger subcarrier spacing, a high-speed scene can be better supported, and cyclic shift restriction does not need to be used.

Wherein the cell coverage supported by each format is based on CP length (T) _CP ) Considering the maximum round-trip propagation delay, the multipath delay spread (T) of the channel _P ) And calculating the speed of light to obtain the maximum cell radius = (T) _CP -T _P ) /κ × c/2 wherein κ =1/30.76 × 10 ⁶ And second.

The present invention will be described in detail below with reference to specific examples.

As shown in fig. 3, a method for determining a random access channel opportunity according to an embodiment of the present invention is applied to a terminal side, and includes the following steps:

step 101, receiving a downlink synchronization signal block SSB sent by a network side, where the downlink SSB carries an SSB index;

in this step, the SSB transmits SSBs to each wave bit in the satellite coverage area in a manner of expanding the SSB index.

For example, there are I wave bits in the satellite coverage area and the wave bit ID is labeled as I in the scanning order, and I = 0.., I-1, where each wave bit dwell time corresponds to L candidate SSBs, and then the index of the 1 st candidate SSB of the wave bit with ID I is I × L; thus, the two-level SSB index can exist, the first-level SSB index is equal to the wave bit ID, and the second-level SSB index represents the candidate SSB in the wave bit residence time. The maximum number L of the candidate SSBs is limited by the residence time of the wave bits, each wave bit can be flexibly scheduled for the number of the SSBs actually scheduled, and the number of the scheduling is less than or equal to L.

Also, for simplicity of design, it may be default that the relative timing of SSB transmission within each wave bit dwell is determined to be constant, which is the initial timing relative to the wave bit dwell time. The terminal defaults to receive the SSB within the wave bit residence time by taking the wave bit scanning period as a period.

It should be noted that, under the satellite-ground system, the ground is covered by beam scanning, there are I wave positions in the satellite coverage area, the index is 0 _b ms, beam sweep period T _period ＝I×T _b 。

Step 102, receiving a random access channel RACH Configuration indication Index (RACH-Configuration Index) sent by a network side, where the RACH Configuration indication Index is used to indicate a terminal to acquire time domain location Configuration information of an uplink random access channel (RO) opportunity, and the SSB Index is associated with the time domain location Configuration information of the uplink RO;

in this step, the SSB indexing and associating includes: and a part of information in the time domain position configuration information of the uplink RO is information of the SSB index having a mapping relation.

Step 103, determining the time domain position of the uplink RO corresponding to the downlink SSB according to the SSB index and the RACH configuration indication index;

based on the above embodiment, an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO for the same wave bit. Wherein, the sending time of the downlink SSB refers to the time when the network side sends the SSB, and the receiving time of the uplink RO refers to the time when the network side receives the uplink RO.

As shown in fig. 4, the time domain offset of the uplink and downlink beams in the corresponding wave position is designed as T _offset Wherein the offset value T _offset Can be flexibly configured and broadcast to the terminal by the network, and under the simplified scene, T _offset The method is pre-configured at the base station and the user side.

As shown in fig. 5, based on the offset design, when receiving a downlink beam, the UE on the ground needs to perform actual RTT measurement according to the time information (timeInfo) contained in the downlink beam, and the reception delay of the downlink beam is the same as the reception delay of the downlink beam

Where i =1,2. In order to ensure that the satellite receives the uplink message at the corresponding uplink beam scanning residence time, the UE needs to consider the uplink propagation delay and the arrangement of the corresponding uplink beams, so that the RACH message corresponding to the design of the scheme needs to be stopped, and the like

If for the second SSB, then the receive delay is

The waiting time is

In the above embodiment, the terminal obtains the SSB index carried by the downlink SSB by receiving the downlink synchronization signal block SSB sent by the network side; receiving a Random Access Channel (RACH) configuration indication index sent by a network side at the same time, so that a terminal acquires time domain position configuration information of an uplink random access channel (RO) opportunity through the RACH configuration indication index, and an SSB index is associated with the time domain position configuration information of the uplink RO; thus, the time domain position of the uplink RO corresponding to the downlink SSB can be determined according to the SSB index and the RACH configuration indication index; therefore, by performing time delay design on the scanning time of the uplink and downlink wave beams at the same wave beam residence position, the transmission waiting time delay of the uplink and downlink signaling (including the RO) of the user in the same wave beam position can be reduced, and the problems that the network cannot effectively distribute the RO and the terminal cannot use the RO in a conventional mode and the resource waste is too much caused by the fact that the RO window is too large due to the overlarge air interface transmission time delay in the ground network NTN are avoided.

In a specific embodiment, the offset value is greater than or equal to a maximum round trip time RTT within the network coverage area.

In the implementation, the time delay influence of the maximum satellite coverage wave position RTT is considered, and the time domain offset of the uplink and downlink wave beams in the corresponding wave position is designed to be T _offset Therefore, the satellite can carry out regular design on the uplink and downlink beam scanning maps according to RTT measurement, and can avoid the problems that the network cannot effectively distribute RO and the terminal cannot use the RO in a conventional mode due to the super-large air interface transmission delay in the ground network NTN and the resource waste is caused by the overlarge RO window.

In an embodiment, the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is related to the wave position ID and c; wherein c represents the time domain position of the c-th RO within the same wave position dwell time.

Based on the above embodiment, the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is further related to at least one of the following information:

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

Illustratively, assume that the initial downlink beam scan time is set to the relative 0 time of the access procedure, and that one scan cycle within the satellite coverage area is time-aligned with an integer number of SFNs (if there is a margin,then rounding up). In a satellite communication system, the subcarrier spacing is defined as Δ f =2 ^μ 15kHz, the maximum number of RO time domain positions in the wave bit dwell time can be calculated according to the Preamble format and the wave bit dwell time, and the accurate time domain positions of a plurality of ROs in the wave bit dwell time are further respectively determined. Determining the time domain position of the RO may specifically include:

firstly, according to the format Preamble format and the wave bit residence time T of the random access Preamble code _b Can calculate the wave position residence time T _b The theoretically maximum number M of RO temporal locations to support, wherein,

T _dur is RO duration, and the T _dur Related to a format of the random access preamble; in this embodiment, for T _dur Is set as the rounded total length of CP-OFDM and GT, i.e. T under

Format

0,1, 2, 3 _dur 1ms, 3ms, 3.5ms and 1ms respectively; the short format is an integer number of symbol lengths, and is specifically as follows:

format Format	A1	A2	A3	B1	B2	B3	B4	C0	C2
										Length symb	2	4	6	2	4	6	8	2	6

Second, as shown in FIG. 6, the dwell time T of the wave site i _b Number of RO time domain positions in

Considering the uplink and downlink beam scanning offsets, the start time (in ms) of the bit dwell time of the bit i is: t is _offset +i×T _b ms；

The starting time (in ms) of the c-th RO is:

wherein c belongs to {0,1,. Eta., M-1},

from the above examples, it can be seen that T is known _offset And M, the starting instant of the c-th RO is related to the wave position ID and c; at unknown T _offset And M, under the condition that the initial downlink beam scanning time is not the relative 0 time of the access process, the starting time of the c-th RO is the ID, c and T of the wave position _offset Wave position residence time T _b System frame number SFN at start of downlink beam scanning period _init A format of a random access preamble, and a time domain offset value T of the RO _{ro_offset} And (3) related.

It should be noted that, as an implementation manner, the format of the random access preamble may be indicated by the RACH configuration indication index; or different T can be selected and set in advance when RO arrangement design is carried out _{ro_offset} M, preamble Format, to specify the time domain offset of RO, the number of RO time domain positions, and the Format.

Wherein a system frame number SFN at the beginning of the downlink beam scanning period _init Updated by the network at the start of each beam sweep period.

It is noted that SFN _init The broadcast is sent to the terminal by the network side, but the broadcast is not necessarily sent to the terminal every time the update is carried out, and the terminal can be according to the previous or last SFN _init Calculating the SNF of this time according to the scanning period _init Thereby avoiding reception delay.

Based on the above embodiment, the SSB index has a first mapping relation with the wave bit ID; the SSB index has a second mapping relationship with the c.

Exemplarily, there are I wave positions in the coverage area of the satellite, and the wave position ID is labeled I in the scanning order, and I = 0.., I-1, where the dwell time of each wave position corresponds to L candidate SSBs, and then the index of the 1 st candidate SSB of the wave position with ID I is I × L; the index of the 2 nd candidate SSB is i × L +1; the index of the Lth candidate SSB is i × L + L-1. Thus, the first mapping relationship between the SSB index and the wave bit ID is:

ssbindex mod L = i; wherein ssbindex is the wave position index, mod is the modulo operation, and i is the wave position ID. That is, the primary SSB index (ssbindex mod L) may represent the first candidate SSB in the wave bit dwell time.

In an embodiment, the second mapping relationship comprises:

in the case where the downlink SSB and the uplink RO are in one-to-many (SSB-perRACH-occupancy < 1) correspondence,

in the case where the downlink SSB and the uplink RO are in one-to-one correspondence (SSB-perRACH-occupancy = 1),

in the case where the downlink SSB and the uplink RO are in a many-to-one (SSB-perRACH-occupancy > 1) correspondence relationship,

wherein N represents the number of ROs corresponding to one SSB; p represents the number of SSBs corresponding to one RO;

indicating transmission within dwell time of the same wave bit

A SSB, and

having a third mapping relationship with the SSB index; n is _f Representing the frequency division multiplexing number corresponding to the message Msg1 frequency division multiplexing type; c represents the same wave position residence time T _b The temporal location of the c-th RO within.

Exemplarily, there are I wave positions in the coverage area of the satellite, and the wave position ID is labeled I in the scanning order, and I = 0.., I-1, where the dwell time of each wave position corresponds to L candidate SSBs, and then the index of the 1 st candidate SSB of the wave position with ID I is I × L; the index of the 2 nd candidate SSB is i × L +1; of the Lth candidate SSBThe index is i × L + L-1. Then the process of the first step is carried out,

having a third mapping relationship with the SSB index may be:

wherein the content of the first and second substances,

is indexed by the secondary SSB to indicate the second of the dwell time

And (4) an SSB.

In a specific embodiment, the time domain position of the uplink RO indicated in the time domain position configuration information of the RO includes:

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

wherein the SFN is _init Is the system frame number at the beginning of the downlink beam scanning period; t is _offset Is the offset value; i is a wave position ID; t is _b Is the wave position dwell time; m is the wave position residence time T _b Number of RO time domain positions configured in, and

T _dur is RO duration, and said T _dur Related to a format of the random access preamble; c represents the same wave position residence time T _b The temporal location of the c-th RO within; t is a unit of _{ro_offset} A time domain offset value for the RO; mu is a subcarrier spacing configuration parameter.

It is noted that SFN is adopted here _init And T _offset Are all in the same units as the system frame SFN.

As an implementation manner, in summary of the design and analysis, the time domain location distribution column (RACH configuration indication index, system frame number, subframe number, timeslot, and start symbol) of the RO may be pre-consolidated into a table form to be pre-configured on the base station and the terminal side, and the user terminal is informed through the RACH configuration indication index in the access procedure.

The following is illustrated in a specific configuration:

example one: the dwell time of the wave position is 1ms _offset Is 20ms, T _dur Is 1ms.

Configuration 1: long Format Format 0, subcarrier spacing 30kHz, M =1, T _{ro_offset} ＝0。

Under the configuration, the residence time of 1 wave position can only set 1 RO time domain position, and set T _{ro_offset} =0, for the ith wave position, assuming that the initial downlink beam scanning time is set as the relative 0 time of the access process, the uplink wave position residence starting time is:

T _offset +i×T _b ＝(20+i)ms；

the starting time of the upstream RO is:

the time domain resource table of the RO is as follows:

where in the table (SFN) _init +T _offset ) mod 1024 is the starting frame number, T, of the upstream RO cycle _offset Is an integer ms, the same unit as SFN.

A second configuration: short Format B4, subcarrier spacing 120khz, m =10,

it can be calculated that 1 × 8 × 14=112 symbols exist in 1 wave bit dwell time, theoretically, at most 14 RO time domain position arrangements are supported, 10 RO time domain positions are configured in 1 wave bit dwell time, and the set RO time domain positions are set

Satisfy the requirement of

For the ith wave position, assuming that the initial downlink wave beam scanning time is set as the relative 0 time of the access process, the uplink wave position residence starting time is:

T _offset +i×T _b ＝(20+i)ms；

the starting time of the ascending RO is as follows:

the time domain resource table of the RO is as follows:

wherein (1) in the table above is:

in the above table, (2) is:

where in the table (SFN) _init +T _offset ) mod 1024 is the starting frame number, T, of the upstream RO period _offset Is an integer ms, the same unit as SFN.

c, when different values are taken, the time slot of the RO is as follows:

c the starting sign of RO when different values are taken is:

the configuration is three: short Format Format B4, subcarrier spacing 120kHz, M =13, T _{ro_offset} ＝0ms。

Then, it can be calculated that 1 × 8 × 14=112 symbols exist in 1 wave bit dwell time, theoretically, most 14 RO time domain position arrangements are supported, optionally, 13 RO time domain positions are configured in 1 wave bit dwell time, and for the ith wave bit, assuming that the initial downlink beam scanning time is set as the relative 0 time of the access process, the uplink wave bit dwell start time is:

T _offset +i×T _b ＝(20+i)ms；

the starting time of the upstream RO is as follows:

due to the fact that

Then it can take T _{ro_offset} ＝0symbols；

The RO time domain resource table is as follows:

wherein (3) in the table above is:

in the above table (4) are:

When c takes different values, the time slot of the RO is:

when c takes different values, the starting sign of RO is:

thus, in example one, the solidified RO time domain resource table is:

the (1) in the above table is specifically:

the (2) in the above table is specifically:

the (3) in the above table is specifically:

the (4) in the above table is specifically:

Example two: the wave position residence time is 12ms, T _offset Is 20ms, T _dur Is 1ms.

Configuring a first step: long Format Format 1, subcarrier spacing 30kHz, M =4, T _{ro_offset} ＝0ms。

T _offset +i×T _b ＝(20+12i)ms；

the starting time of the upstream RO is

The RO time domain resource table is as follows:

Configuring a second step: long Format Format 2, subcarrier spacing 120kHz, M =3, T _{ro_offset} ＝0ms。

There are at most 3 RO time domain positions for 1 wave position dwell time in this configuration.

T _offset +i×T _b ＝(20+12i)ms；

the starting time of the ascending RO is as follows:

the RO time domain resource table is as follows:

Thus, in example two, the solidified RO time domain resource table is:

wherein, in the table (SFN) _init +T _offset ) mod 1024 is the starting frame number, T, of the upstream RO cycle _offset Is an integer ms, the same unit as SFN.

As can be seen from the foregoing embodiments, in step 103, the time domain position of the uplink RO corresponding to the downlink SSB is determined according to the SSB index and the RACH configuration indication index, and as shown in fig. 7, the terminal first determines T _offset 、T _{ro_offset} And SFN _init Determining a wave position ID according to the SSB index, and further determining c based on the SSB index and the corresponding relation between the SSB and the RO; and the time domain position of the RO can be determined by analyzing RACH configuration indication information indicated by the prach-configuration index.

In an optional embodiment, the terminal acquires the random access parameter IE RACH-ConfigCommon for specifying the cell-specific by parsing the system information block SIB information, and the method includes at least one of the following:

totalNumberOfRA-Preambles for indicating a total number of Preambles in RACH resources for contention-based and non-contention-based random access;

SSB-perRACH-occupancy and dcb-Preamble PerssB for indicating SSB-RO correspondence and contention-based Preamble number per SSB;

RACH-ConfigGeneric of RACH parameters set for regular random access and beam failure recovery, including: the prach-configuration index is used for indicating the RO time domain position configuration; msg1-FDM for indicating Msg1 frequency division type and Msg 1-freqyStart for indicating frequency domain start position.

T for indicating RO time domain offset _offset ；

SFN for computing RO temporal location _init ；

Wherein, the correspondence between the SSB and the RO comprises: SSB is one-to-one with RO; SSB is one-to-many with RO; SSB and RO are many-to-one;

it should be noted that the order of SSB mapping to PRACH occasion should follow the following four requirements:

first, the order of preamble indices in one RO is increasing;

second, the frequency resource index order of the frequency reuse ROs is increasing;

third, the order of the time domain resource indices of the time domain multiplexed RO within the RACH slot is increasing;

fourth, the order of RACH slot indices is incremented.

For a specific example, it is assumed that one wave bit dwell time contains 8 SSBs, msgl-FDM =4, which indicates that the number of frequency domain ROs is 4;

example 1

As shown in fig. 8, it is a schematic diagram of a one-to-many relationship between SSBs and ROs in a wave bit dwell time slot, specifically SSB-perRACH-occupancy =1/4, which indicates that 4 ROs are mapped by one SSB, and msg1-FDM =4, which indicates that there are 4 frequency-domain ROs on one time-domain RO, so that 4 frequency-domain ROs on a first time-domain RO correspond to one SSB, 4 frequency-domain ROs on a second time-domain RO correspond to another SSB, and so on.

Example 2

As shown in fig. 9, it is a schematic diagram of a one-to-one relationship between SSBs and ROs in a wave bit dwell time slot, specifically SSB-perRACH-occupancy =1, which indicates that 1 RO is mapped to one SSB, and msg1-FDM =4, which indicates that 4 frequency domain ROs exist on one time domain RO, so that the 4 frequency domain ROs on the first time domain RO correspond to one SSB, which is SSB 0 to SSB 3, respectively, and the number of SSBs is 8, and at this time, the mapping is not completed, and therefore the SSBs 4 to 7 are mapped in an ascending order in sequence on the 4 frequency domain ROs on the second time domain RO according to the SSB-RO mapping requirement, and so on.

Example 3

As shown in fig. 10, it shows a schematic diagram of a many-to-one relationship between SSBs and ROs in one wave bit dwell time slot, specifically SSB-perRACH-occupancy =2, which indicates that 2 SSBs map 1 RO, so that the mapping of 4 frequency domain ROs on a first time domain RO is as follows: SSB 0/1 maps RO 0, SSB2/3 maps at RO 1, SSB 4/5 maps at RO 2, SSB 6/7 maps at RO 3, and so on.

As shown in fig. 11, an embodiment of the present invention provides a method for determining a random access channel opportunity, which is applied to a network side, and includes:

step 201, sending a downlink synchronization signal block SSB to each wave position in a satellite coverage area, where the downlink SSB carries an SSB index;

it should be noted that, in the satellite-ground system, the ground is covered by beam scanning, there are I wave positions in the satellite coverage area, the indexes are 0, _b ms, beam sweep period T _period ＝I×T _b 。

For example, there are I wave bits in the satellite coverage area and the wave bit ID is labeled as I in the scanning order, and I = 0.., I-1, where the dwell time of each wave bit corresponds to L candidate SSBs, the index of the L-th candidate SSB of the wave bit with ID I is I × L; thus, the two-level SSB index can exist, the first-level SSB index is equal to the wave bit ID, and the second-level SSB index represents the candidate SSB in the wave bit residence time. The maximum number L of the candidate SSBs is limited by the residence time of the wave bits, each wave bit can be flexibly scheduled for the number of the SSBs actually scheduled, and the number of the scheduling is less than or equal to L.

Also, for simplicity of design, it may be default that the relative timing of SSB transmission within each wave bit dwell is determined to be constant, which is the initial timing relative to the wave bit dwell time. The terminal receives the SSB by default with the wave bit residence time as a period.

Step 201, sending random access channel RACH configuration indication information to each wave position in a satellite coverage area, where the RACH configuration indication index is used to indicate a terminal to obtain time domain location configuration information of an uplink random access channel opportunity RO, and the SSB index is associated with the time domain location configuration information of the uplink RO;

As shown in fig. 4, the uplink and downlink beam time domain offset in the corresponding wave position is designed to be T _offset Wherein the offset value T _offset Can be flexibly configured and broadcast to the terminal by the network, and under the simplified scene, T _offset The method is pre-configured at the base station and the user side.

Based on the offset design, as shown in FIG. 5, on the groundWhen receiving the downlink beam, the UE needs to perform actual RTT measurement according to the timeInfo information contained therein, and the reception delay of the downlink beam is the same as the reception delay of the downlink beam

Where i =1, 2.. Denotes the ith RACH message. In order to ensure that the satellite receives the uplink message at the corresponding uplink beam scanning residence time, the UE needs to consider the uplink propagation delay and the arrangement of the corresponding uplink beams, so that the RACH message corresponding to the design of the scheme needs to be stopped, and the like

If for the second SSB, then the receive delay is

The waiting time is

In the above embodiment, the network side sends a downlink synchronization signal block SSB to each wave position in the satellite coverage area, where the downlink SSB carries an SSB index; sending Random Access Channel (RACH) configuration indication information to each wave bit in a satellite coverage area, wherein the RACH configuration indication index is used for indicating a terminal to obtain time domain position configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain position configuration information of the uplink RO, so that the terminal can determine the time domain position of the uplink RO corresponding to a downlink SSB according to the SSB index and the RACH configuration indication index; in this way, by performing the delay design on the scanning time of the uplink and downlink beams at the same beam dwell position, the transmission waiting delay of the uplink and downlink signaling (including the RO) of the user in the same beam position can be reduced, and the problems that the terminal cannot obtain the valid RO due to the existing scheme of 5G NR allocation and random access opportunity determination, and the resource waste is excessive due to the excessively large RO window are avoided.

In the implementation, the time delay influence of the maximum satellite coverage wave position RTT is considered, and the time domain offset of the uplink and downlink wave beams in the corresponding wave position is designed to be T _offset Therefore, the satellite can carry out regular design on the uplink and downlink beam scanning maps according to the RTT measurement, and the problems that the terminal cannot obtain the effective RO and the resource waste is excessive due to the overlarge RO window caused by the conventional scheme of 5G NR distribution and random access opportunity determination are solved.

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

For example, assuming that the initial downlink beam scanning time is set to be 0 relative to the access procedure, and one scanning period in the coverage area of the satellite is aligned with an integer number of SFN times (rounded up if there is a margin), the subcarrier spacing is defined as Δ f =2 in the satellite communication system ^μ 15kHz, the maximum number of RO time domain positions in one wave bit residence time can be calculated according to the Preamble format and the wave bit residence time, and the accurate time domain positions of a plurality of ROs in the wave bit residence time are further respectively determined. The method specifically comprises the following steps:

firstly, according to the format Preamble format and the wave bit residence time T of the random access Preamble code _b Can calculateWave position dwell time T _b The theoretically maximum number M of RO temporal locations to support, wherein,

T _dur is RO duration, and said T _dur Related to a format of the random access preamble; in this embodiment, for T _dur Is set as the rounded total length of CP-OFDM and GT, i.e. T under

Format

format Format	A1	A2	A3	B1	B2	B3	B4	C0	C2
										Length symb	2	4	6	2	4	6	8	2	6

Considering the uplink and downlink beam scanning offsets, the start time (in ms) of the dwell time of the wave position i is: t is _offset +i×T _b ms; the starting time (in ms) of the c-th RO is:

wherein c is in the range of {0,1,. Multidot.,. M-1},

from the above examples, it can be seen that T is known _offset And M, the starting instant of the c-th RO is related to the wave position ID and c; at unknown T _offset And C, under the condition that the initial downlink beam scanning time is not the relative 0 time of the access process, the starting time of the C-th RO is the ID, C and T of the wave position _offset Wave position residence time T _b System frame number SFN at start of downlink beam scanning period _init A format of a random access preamble, and a time domain offset value T of the RO _{ro_offset} And (3) related.

It is noted that, as an implementation, random accessThe format of the preamble may be indicated by a RACH configuration indication index; or different T can be selected and set in advance when the RO configuration design is carried out _{ro_offset} M, preamble Format, to specify the time domain offset of RO, the number of RO time domain positions, and the Format.

It is noted that SFN _init The terminal is broadcasted by the network side, but the terminal is not necessarily broadcasted every time of updating, and the terminal can be broadcasted according to the previous SFN _init Calculating the SNF of this time with the scanning period _init Thereby avoiding reception delay.

Based on the above embodiment, the SSB index has a first mapping relation with the wave bit ID; the SSB index has a second mapping relation with the c.

Exemplarily, there are I wave positions in the coverage area of the satellite, and the wave position ID is labeled I in the scanning order, and I = 0.., I-1, where the dwell time of each wave position corresponds to L candidate SSBs, and then the index of the L candidate SSB of the wave position with ID I is I × L; the index of the 2 nd candidate SSB is i × L +1; the index of the Lth candidate SSB is i × L + L-1. Thus, the SSB index and the wave bit ID have a first mapping relationship:

ssbindex mod L = i; wherein ssbindex is the wave position index, mod is the modulo operation, and i is the wave position ID. That is, the primary SSB index (ssbindex mod L) may represent the next candidate SSB in the wave bit dwell time.

In an embodiment, the second mapping relationship comprises:

indicating transmission within dwell time of the same wave bit

A SSB, and

Exemplarily, there are I wave positions in the satellite coverage area and the wave position ID is labeled as I in the scanning order, and I = 0., I-1, where each wave position dwell time corresponds to L candidate SSBs, and then the index of the 1 st candidate SSB of the wave position ID of I is I × L; the index of the 2 nd candidate SSB is i × L +1; the index of the Lth candidate SSB is i × L + L-1. Then the process of the first step is carried out,

having a third mapping relationship with the SSB index may be:

wherein the content of the first and second substances,

is indexed by the secondary SSB to indicate the second of the dwell time

And (4) an SSB.

In a specific embodiment, the time domain position of the upstream RO indicated in the time domain position configuration information of the RO includes:

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

T _dur is RO duration, and the T _dur Related to a format of the random access preamble; c represents the same wave position residence time T _b The temporal location of the c-th RO within; t is _{ro_offset} A time domain offset value for the RO; mu is a subcarrier spacing configuration parameter.

It is noted that SFN is adopted here _init And T _offset All in the same units as the system frame SFN.

The following is illustrated in a specific configuration:

Under the configuration, the residence time of 1 wave position can only set 1 RO time domain position, and set T _{ro_offset} =0, for the ith wave position, the uplink wave position residence starting time is:

T _offset +i×T _b ＝(20+i)ms；

the starting time of the upstream RO is:

the time domain resource table of the RO is as follows:

Configuring a second step: short Format B4, subcarrier spacing 120khz, m =10,

Satisfy the requirement of

T _offset +i×T _b ＝(20+i)ms；

the starting time of the upstream RO is:

the time domain resource table of the RO is as follows:

wherein (1) in the table above is:

in the above table, (2) is:

it is noted that in the table (SFN) _init +T _offset ) mod 1024 is the starting frame number, T, of the upstream RO period _offset Is an integer ms, the same unit as SFN.

c, when different values are taken, the time slot of the RO is as follows:

the starting sign of RO when c takes different values is:

the configuration is three: short Format Format B4, subcarrier spacing120kHz，M＝13，T _{ro_offset} ＝0ms。

Then, it can be calculated that 1 × 8 × 14=112 symbols exist in 1 wave bit dwell time, theoretically, most 14 RO time domain position arrangements are supported, optionally, 13 RO time domain positions are configured in 1 wave bit dwell time, for the ith wave bit, assuming that the initial downlink beam scanning time is set as the relative 0 time of the access process, the uplink wave bit dwell starting time is:

T _offset +i×T _b ＝(20+i)ms；

the starting time of the upstream RO is:

due to the fact that

Then it can take T _{ro_offset} ＝0symbols；

The RO time domain resource table is as follows:

wherein (3) in the table above is:

in the above table (4) are:

When c takes different values, the time slot of the RO is:

when c takes different values, the starting sign of RO is:

thus, in example one, the solidified RO time domain resource table is:

the (1) in the above table is specifically:

the (2) in the above table is specifically:

the (3) in the above table is specifically:

the (4) in the above table is specifically:

T _offset +i×T _b ＝(20+12i)ms；

the starting time of the upstream RO is

The RO time domain resource table is as follows:

There are at most 3 RO time domain positions for 1 wave position dwell time in this configuration. For the ith wave position, assuming that the initial downlink wave beam scanning time is set as the relative 0 time of the access process, the uplink wave position residence starting time is:

T _offset +i×T _b ＝(20+12i)ms；

the starting time of the upstream RO is:

the RO time domain resource table is as follows:

it is noted that in the table (SFN) _init +T _offset ) mod 1024 is the starting frame number, T, of the upstream RO period _offset Is an integer ms, withThe units of SFN are the same.

Thus, in example two, the solidified RO time domain resource table is:

totalNumberOfRA-Preambles for indicating a total number of Preambles in the RACH resource for contention-based and non-contention-based random access;

RACH-ConfigGeneric of RACH parameters set for regular random access and beam failure recovery, including: the prach-configuration index is used to indicate the RO time domain location configuration; msgl-FDM to indicate Msg1 frequency division type and Msg 1-freqystart to indicate frequency domain start position.

T for indicating RO time domain offset _offset ；

SFN for computing RO temporal location _init ；

Wherein, the corresponding relationship between the SSB and the RO comprises: SSB is one-to-one with RO; SSB is one-to-many with RO; SSB and RO are many-to-one;

first, the order of preamble indices in one RO is increasing;

fourth, the order of RACH slot indices is incremented.

In this embodiment, it is assumed that one wave bit dwell time contains 8 SSBs, msg1-FDM =4, which indicates that the number of frequency domain ROs is 4;

example 1

As shown in fig. 8, it is a schematic diagram illustrating a one-to-many relationship between SSBs and ROs in a wave bit dwell slot, specifically SSB-perRACH-Occasion =1/4, which indicates that 4 ROs are mapped by one SSB, and msg1-FDM =4, which indicates that 4 frequency-domain ROs exist on one time-domain RO, so that 4 frequency-domain ROs on a first time-domain RO correspond to one SSB, 4 frequency-domain ROs on a second time-domain RO correspond to another SSB, and so on.

Example 2

As shown in fig. 9, S is a schematic diagram illustrating a one-to-one relationship between SSBs and ROs in a wave bit dwell time slot, specifically SSB-perRACH-occupancy =1, which indicates that 1 RO is mapped to one SSB, and msg1-FDM =4, which indicates that 4 frequency domain ROs exist on one time domain RO, so that the 4 frequency domain ROs on the first time domain RO correspond to one SSB, which is SSB 0 to SSB 3, respectively, and the SSB number is 8, and at this time, the mapping is not completed, and therefore the SSBs 4 to 7 are mapped in an ascending order in sequence on the 4 frequency domain ROs on the second time domain RO according to the SSB-RO mapping requirement, and so on.

Example 3

As shown in fig. 9, it is a schematic diagram showing a many-to-one relationship between SSBs and ROs in a wave bit dwell time slot, specifically SSB-perRACH-Occasion =2, which indicates that 2 SSBs map 1 RO, so that mapping of 4 frequency domain ROs on a first time domain RO is as follows: SSB 0/1 maps RO 0, SSB2/3 maps at RO 1, SSB 4/5 maps at RO 2, SSB 6/7 maps at RO 3, and so on.

As shown in fig. 12, a device 1200 for determining a random access channel opportunity according to an embodiment of the present invention is applied to a terminal side, and includes:

a first receiving module 1201, configured to receive a downlink synchronization signal block SSB sent by a network side, where the downlink SSB carries an SSB index;

a second receiving module 1202, configured to receive a random access channel RACH configuration indication index sent by a network side, where the RACH configuration indication index is used to indicate a terminal to obtain time domain location configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain location configuration information of the uplink RO:

a determining module 1203, configured to determine, according to the SSB index and the RACH configuration indication index, a time domain position of the uplink RO corresponding to the downlink SSB; wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

Optionally, the offset value is greater than or equal to a maximum round trip time RTT within the network coverage area.

Optionally, the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is related to the wave position ID and c; wherein c represents the time domain position of the c-th RO within the same wave position dwell time.

Optionally, the SSB index has a first mapping relationship with the wave bit ID;

the SSB index has a second mapping relationship with the c.

Optionally, the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is further related to at least one of the following information:

wave position dwell time T _b ；

System frame number SFN at beginning of downlink beam scanning period _init；

A format of a random access preamble;

a time domain offset value of the RO _{Tro_offset} ；

The offset value T _offset 。

Optionally, the time domain position of the uplink RO indicated in the time domain position configuration information of the RO includes:

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

wherein the SFN is _init Is the system frame number at the beginning of the downlink beam scanning period; t is _offset Is the offset value; i is the wave position ID; t is _b Is the wave position dwell time; m is the wave position residence time T _b Number of RO time domain positions configured in, and

T _dur is RO duration, and said T _dur Related to a format of the random access preamble; c represents the same wave position residence time T _b The temporal location of the c-th RO within; t is _{ro_offset} A time domain offset value for the RO; mu is a subcarrier spacing configuration parameter.

Optionally, the second mapping relationship includes:

in the case where the downstream SSB and the upstream RO are in one-to-many correspondence,

in the case where the downstream SSB and the upstream RO are in one-to-one correspondence,

in the case where the downstream SSB and the upstream RO are in a many-to-one correspondence,

wherein, N represents the number of RO corresponding to one SSB; p represents the number of SSBs corresponding to one RO;

indicating transmission within dwell time of the same wave bit

A SSB, and

Optionally, a system frame number SFN at the beginning of the downlink beam scanning period _init Updated by the network at the beginning of each beam sweep period.

The device for determining the random access channel timing of the embodiment obtains the SSB index carried by the downlink SSB by receiving the downlink synchronous signal block SSB sent by the network side; receiving a Random Access Channel (RACH) configuration indication index sent by a network side at the same time, so that a terminal acquires time domain position configuration information of an uplink random access channel (RO) opportunity through the RACH configuration indication index, and an SSB index is associated with the time domain position configuration information of the uplink RO; thus, the time domain position of the uplink RO corresponding to the downlink SSB can be determined according to the SSB index and the RACH configuration indication index; in this way, by performing the delay design on the scanning time of the uplink and downlink beams at the same beam dwell position, the transmission waiting delay of the uplink and downlink signaling (including the RO) of the user in the same beam position can be reduced, and the problems that the terminal cannot obtain the valid RO due to the existing scheme of 5G NR allocation and random access opportunity determination, and the resource waste is excessive due to the overlarge RO window are avoided.

As shown in fig. 13, a device 1300 for determining a random access channel opportunity according to an embodiment of the present invention is applied to a network side, and includes:

a first sending module 1301, configured to send a downlink synchronization signal block SSB to each wave bit in a coverage area of a satellite, where the downlink SSB carries an SSB index;

a second sending module 1302, configured to send random access channel RACH configuration indication information to each wave location in a coverage area of a satellite, where the RACH configuration indication index is used to indicate a terminal to obtain time domain location configuration information of an uplink random access channel opportunity RO, and the SSB index is associated with the time domain location configuration information of the uplink RO; wherein an offset value is provided between the sending time of the downstream SSB and the receiving time of the upstream RO at the same wave position.

the SSB index has a second mapping relationship with the c.

wave position dwell time T _b ；

System frame at start of downlink beam sweep periodSFN number _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

wherein the SFN is _init Is the system frame number at the beginning of the downlink beam scanning period; t is _offset Is the offset value; i is the wave position ID; t is _b Is the wave position dwell time; m is the wave position residence time T _b Number of RO time domain positions configured in the interior, week

Optionally, the second mapping relationship includes:

indicating transmission of bit dwell time

A SSB, and

the SSB index has a third mapping relation; n is _f Representing the frequency division multiplexing number corresponding to the Msg1 frequency division multiplexing type; c represents the same wave position residence time T _b The temporal location of the c-th RO within.

Optionally, a system frame number SFN at the beginning of the downlink beam scanning period _init Updated by the satellite at the beginning of each beam sweep period.

The device for determining the random access channel opportunity of the embodiment transmits a downlink synchronization signal block SSB to each wave bit in a satellite coverage area, wherein the downlink SSB carries an SSB index; sending Random Access Channel (RACH) configuration indication information to each wave bit in a satellite coverage area, wherein the RACH configuration indication index is used for indicating a terminal to acquire time domain position configuration information of an uplink random access channel (RO), and the SSB index is associated with the time domain position configuration information of the uplink RO, so that the terminal can determine the time domain position of the uplink RO corresponding to a downlink SSB according to the SSB index and the RACH configuration indication index; in this way, by performing the delay design on the scanning time of the uplink and downlink beams at the same beam dwell position, the transmission waiting delay of the uplink and downlink signaling (including the RO) of the user in the same beam position can be reduced, and the problems that the terminal cannot obtain the valid RO due to the existing scheme of 5G NR allocation and random access opportunity determination, and the resource waste is excessive due to the overlarge RO window are avoided.

A terminal according to another embodiment of the present invention, as shown in fig. 14, includes a transceiver 1410, a processor 1400, a memory 1420, and programs or instructions stored in the memory 1420 and executable on the processor 1400; the processor 1400, when executing the program or instructions, performs the following steps:

The transceiver 1410 is used for receiving and transmitting data under the control of the processor 1400.

Where in fig. 14 the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors, represented by the processor 1400, and various circuits of memory, represented by the memory 1420, 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 1410 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. For different user devices, the user interface 1430 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1420 may store data used by the processor 1400 in performing operations.

the SSB index has a second mapping relation with the c.

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

Optionally, the second mapping relationship includes:

indicating transmission within dwell time of the same wave bit

A SSB, and

Optionally, a system frame number SFN at the beginning of the downlink beam scanning period _init Updated by the network at the start of each beam sweep period.

An access network apparatus according to another embodiment of the present invention, as shown in fig. 15, includes a transceiver 1510, a processor 1500, a memory 1520, and a program or instructions stored on the memory 1520 and executable on the processor 1500; the processor 1500, when executing the program or instructions, performs the following steps:

sending a downlink synchronous signal block SSB to each wave position in a satellite coverage area, wherein the downlink SSB carries an SSB index;

wherein, an offset value is provided between the sending time of the downlink SSB and the receiving time of the uplink RO of the same wave bit.

The transceiver 1510 is used for receiving and transmitting data under the control of the processor 1500.

In fig. 15, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1500 and various circuits of memory represented by memory 1520 being 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 1510 may be a number of elements including a transmitter and receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 1500 is responsible for managing the bus architecture and general processing, and the memory 1520 may store data used by the processor 1500 in performing operations.

the SSB index has a second mapping relationship with the c.

Optionally, the time-domain location of the upstream RO indicated in the time-domain location configuration information of the RO is further related to at least one of the following information:

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

Optionally, the second mapping relationship includes:

indicating transmission within the dwell time of the wave bits

A SSB, and

The readable storage medium of the embodiment of the present invention stores a program or an instruction thereon, and the program or the instruction, when executed by the processor, implements the steps in the method for determining a random access channel timing as described above, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It is further noted that the terminals described in this specification include, but are not limited to, smart phones, tablets, etc., and that many of the functional components described are referred to as modules in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

The exemplary embodiments described above are described with reference to the drawings, and many different forms and embodiments of the invention may be made without departing from the spirit and teaching of the invention, therefore, the invention is not to be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary 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. In the drawings, the size and relative sizes of elements may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values, when stated, includes the upper and lower limits of the range and any subranges therebetween.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for determining random access channel opportunity is applied to a terminal side, and comprises the following steps:

2. The method of claim 1, wherein the offset value is greater than or equal to a maximum Round Trip Time (RTT) within a coverage area of the network.

3. The method of claim 1, wherein the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is related to a wave position ID and c; wherein c represents the time domain position of the c-th RO within the same wave position dwell time.

4. The method of determining random access channel occasions according to claim 3,

the SSB index has a first mapping relation with the wave bit ID;

the SSB index has a second mapping relation with the c.

5. The method of claim 3, wherein the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is further related to at least one of the following information:

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

6. The method of claim 5, wherein the time domain position of the uplink RO indicated in the time domain position configuration information of the RO comprises:

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

7. The method of claim 4, wherein the second mapping relationship comprises:

wherein N represents oneThe number of ROs corresponding to each SSB; p represents the number of SSBs corresponding to one RO;

indicating transmission within dwell time of the same wave bit

A SSB, and

the SSB index has a third mapping relation; n is _f Representing the frequency division multiplexing number corresponding to the message Msg1 frequency division multiplexing type; c represents the same wave position residence time T _b The temporal location of the c-th RO within.

8. The method of claim 5, wherein the SFN at the beginning of the downlink beam-sweeping period is a System Frame Number (SFN) _init Updated by the network at the start of each beam sweep period.

9. A method for determining random access channel opportunity is applied to a network side, and comprises the following steps:

10. The method of claim 9, wherein the offset value is greater than or equal to a maximum Round Trip Time (RTT) within the network coverage area.

11. The method of claim 9, wherein the time domain position of the upstream RO indicated in the time domain position configuration information of the RO is related to a wave position ID and c; wherein c represents the time domain position of the c-th RO within the same wave position dwell time.

12. The method of determining random access channel occasions according to claim 11,

the SSB index and the wave bit ID have a first mapping relation;

the SSB index has a second mapping relationship with the c.

13. The method of claim 11, wherein the time domain position of the uplink RO indicated in the time domain position configuration information of the RO is further related to at least one of the following information:

wave position dwell time T _b ；

System frame number SFN at start of downlink beam sweep period _init ；

A format of a random access preamble;

time domain offset value T of the RO _{ro_offset} ；

The offset value T _offset 。

14. The method of claim 13, wherein the time domain location of the uplink RO indicated in the time domain location configuration information of the RO comprises:

the system frame number is:

the subframe number is:

the time slots are as follows:

the starting symbols are:

15. The method of claim 12, wherein the second mapping relationship comprises:

indicating transmission within the dwell time of the wave bits

A SSB, and

having a third mapping relationship with the SSB index; n is _f Representing the frequency division multiplexing number corresponding to the Msg1 frequency division multiplexing type; c represents the same wave position residence time T _b The temporal location of the c-th RO within.

16. The method of claim 13, wherein the System Frame Number (SFN) at the beginning of the downlink beam-sweeping period _init Updated by the satellite at the beginning of each beam sweep period.

17. An apparatus for determining random access channel timing, applied to a terminal side, includes:

18. An apparatus for determining a random access channel opportunity, applied to a network side, includes:

19. A terminal, comprising: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; a method of determining random access channel occasions according to any one of claims 1 to 8 when the program or instructions are executed by the processor.

20. An access network device, comprising: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; a method for determining random access channel occasions according to any one of claims 9-16, when the program or instructions are executed by the processor.

21. A readable storage medium having stored thereon a program or instructions, which when executed by a processor, implements the method for determining random access channel occasions according to any one of claims 1-16.