CN114501668A - Message transmission method and device for physical random access channel, storage medium, terminal and base station - Google Patents

Message transmission method and device for physical random access channel, storage medium, terminal and base station Download PDF

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Publication number
CN114501668A
CN114501668A CN202011148785.9A CN202011148785A CN114501668A CN 114501668 A CN114501668 A CN 114501668A CN 202011148785 A CN202011148785 A CN 202011148785A CN 114501668 A CN114501668 A CN 114501668A
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transmission
message
slot
random access
configuration information
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CN202011148785.9A
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CN114501668B (en
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雷珍珠
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Spreadtrum Semiconductor Nanjing Co Ltd
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Spreadtrum Semiconductor Nanjing Co Ltd
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Priority to PCT/CN2021/125572 priority patent/WO2022083724A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A message transmission method and device, storage medium, terminal and base station for physical random access channel are provided, the method comprises: receiving transmission time slot configuration information; determining the time domain position of the transmission time slot according to the transmission time slot configuration information; and during the period of sending the first message through the physical random access channel, utilizing the transmission time slot to carry out frequency offset adjustment and/or sending timing advance adjustment. The UE performance in the NTN scene can be optimized through the scheme of the invention, so that the UE can better cope with rapid time delay change.

Description

Message transmission method and device for physical random access channel, storage medium, terminal and base station
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a message for a physical random access channel, a storage medium, a terminal, and a base station.
Background
In a Non-geostationary satellite scenario based on a Non-Terrestrial network (NTN), due to the fast movement of a satellite relative to User Equipment (UE), propagation delay between the UE and the satellite changes rapidly with time and doppler frequency shift, thereby causing uplink step loss or frequency offset. For this problem, in the process of communicating with the network, the UE needs to frequently adjust the transmission Timing Advance (TA) and the frequency offset.
Currently, in an NTN scenario, before sending a Message 1(Message 1, Msg1 for short), a UE performs pre-compensation of sending timing advance according to an estimated TA value, that is, the UE sends the Message 1(Msg1) in advance according to a measured TA value. The UE can also perform frequency offset pre-compensation according to the estimated frequency offset value.
However, in general, one transmission (including repeated transmission) of the message 1(Msg1) takes a long time. While the propagation delay between the UE and the satellite in the NTN scenario changes very rapidly, the pre-compensated TA and frequency offset values before sending message 1(Msg1) do not completely account for the uplink step-out and frequency offset during one transmission. Uplink out-of-step and frequency offset can seriously affect the communication quality between the UE and the network, and further affect the UE performance.
Disclosure of Invention
The technical problem solved by the invention is how to optimize the UE performance in the NTN scene, so that the UE can better cope with rapid time delay change.
To solve the foregoing technical problem, an embodiment of the present invention provides a message transmission method for a physical random access channel, including: receiving transmission time slot configuration information; determining the time domain position of the transmission time slot according to the transmission time slot configuration information; and during the period of sending the first message through the physical random access channel, utilizing the transmission time slot to carry out frequency offset adjustment and/or sending timing advance adjustment.
Optionally, the number of the transmission timeslots is multiple and is distributed in the transmission period of the first message.
Optionally, the transmission slot configuration information includes a period and a length of the transmission slot.
Optionally, the determining the time domain position of the transmission timeslot according to the transmission timeslot configuration information includes: and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot included in the transmission time slot configuration information.
Optionally, the configuration information of the transmission time slot includes a format of a physical random access channel, where different formats of the physical random access channel correspond to different periods and lengths of the transmission time slot.
Optionally, the determining the time domain position of the transmission timeslot according to the transmission timeslot configuration information includes: determining the period and the length of the corresponding transmission time slot according to the format of the physical random access channel included in the transmission time slot configuration information; and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot.
Optionally, the unit of the period of the transmission slot is selected from: a millisecond, a subframe, a frame, a slot, a group of symbols, and a repeating transmission unit of the first message, wherein a single repeating transmission unit of the first message includes a plurality of the groups of symbols.
Optionally, the transmission slot configuration information is at a cell level, a beam level, or a beam group level.
Optionally, the transmission timeslot configuration information is carried by a broadcast message.
Optionally, the sending operation of the first message is not performed during the frequency offset adjustment.
In order to solve the above technical problem, an embodiment of the present invention further provides a message transmission apparatus for a physical random access channel, including: a receiving module, configured to receive transmission timeslot configuration information; a determining module, configured to determine a time domain position of the transmission timeslot according to the transmission timeslot configuration information; and the transmission module is used for carrying out frequency offset adjustment and/or sending timing advance adjustment by utilizing the transmission time slot during the period of sending the first message through the physical random access channel.
In order to solve the above technical problem, an embodiment of the present invention further provides a message transmission method for a physical random access channel, including: determining a time domain position of a transmission time slot during the transmission of the first message through the physical random access channel according to the frequency offset and/or the change speed of the sending timing advance, wherein the transmission time slot is used for adjusting the frequency offset and/or the sending timing advance; and generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot.
Optionally, before determining, according to the frequency offset and/or the change speed of the sending timing advance, the time domain position of the transmission timeslot during transmission of the first message through the physical random access channel, the message transmission method further includes: and determining the frequency deviation and/or the change speed of the sending timing advance according to the satellite ephemeris information, the orbit of the satellite, the cell position information and/or the UE position information.
Optionally, the number of the transmission timeslots is multiple and is distributed in the transmission period of the first message.
Optionally, the transmission slot configuration information includes a period and a length of the transmission slot.
Optionally, the configuration information of the transmission time slot includes a format of a physical random access channel, where different formats of the physical random access channel correspond to different periods and lengths of the transmission time slot.
Optionally, the unit of the period of the transmission slot is selected from: milliseconds, subframes, frames, slots, symbol groups, and the first message repetition transmission unit, wherein a single repetition transmission unit of the first message comprises a plurality of the symbol groups.
Optionally, the transmission slot configuration information is at a cell level, a beam group level, or a beam level.
Optionally, the transmission timeslot configuration information is sent through a broadcast message.
In order to solve the above technical problem, an embodiment of the present invention further provides a message transmission apparatus for a physical random access channel, including: a determining module, configured to determine, according to a frequency offset and/or a change speed of a sending timing advance, a time domain position of a transmission time slot during transmission of a first message through the physical random access channel, where the transmission time slot is used to perform frequency offset adjustment and/or sending timing advance adjustment; and the sending module is used for generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, and the computer program executes the steps of the above method when being executed by a processor.
In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the method when running the computer program.
In order to solve the above technical problem, an embodiment of the present invention further provides a base station, including a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the method when running the computer program.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
for a UE side, an embodiment of the present invention provides a message transmission method for a physical random access channel, including: receiving transmission time slot configuration information; determining the time domain position of the transmission time slot according to the transmission time slot configuration information; and during the period of sending the first message through the physical random access channel, utilizing the transmission time slot to carry out frequency offset adjustment and/or sending timing advance adjustment.
Compared with the prior technical scheme of only carrying out frequency offset and sending timing advance pre-compensation before sending the first message, the embodiment enables the UE to better cope with rapid time delay change by setting special time for sending timing advance adjustment and/or frequency offset adjustment during sending the first message, and is beneficial to the UE performance in an NTN scene. Specifically, the time domain position of the transmission time slot, which needs to be adjusted in frequency offset and/or in sending timing advance, during the sending of the first message is determined based on the transmission time slot configuration information, so that the UE can adjust the sending timing advance and the frequency offset in time during the sending of the first message, and adapt to rapid delay and doppler shift changes in an NTN scene.
For the network side, an embodiment of the present invention further provides a message transmission method for a physical random access channel, including: determining a time domain position of a transmission time slot during the transmission of the first message through the physical random access channel according to the frequency offset and/or the change speed of the sending timing advance, wherein the transmission time slot is used for adjusting the frequency offset and/or the sending timing advance; and generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot. By adopting the embodiment, the transmission time slot for adjusting the sending timing advance and/or the frequency offset can be configured for the UE in advance during the first message transmission according to the frequency offset and/or the change speed of the sending timing advance, so that the UE can better cope with rapid time delay change during the first message transmission.
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FIG. 1 is a schematic diagram of transmit timing advance adjustment during message 1 transmission in a scenario where no transmission slot is employed;
FIG. 2 is a schematic diagram of transmit timing advance adjustment during message 1 transmission in a scenario employing transmission slots;
fig. 3 is a flowchart of a first message transmission method for a physical random access channel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a first exemplary application scenario of an embodiment of the present invention;
FIG. 5 is a diagram illustrating a second exemplary application scenario of the present invention;
fig. 6 is a schematic structural diagram of a first message transmission apparatus for a physical random access channel according to an embodiment of the present invention;
fig. 7 is a flowchart of a second message transmission method for a physical random access channel according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second message transmission apparatus for a physical random access channel according to an embodiment of the present invention.
Detailed Description
As mentioned in the background art, the UE in the prior art only performs frequency offset and transmission timing advance pre-compensation before transmitting the first message, and such an implementation cannot cope with fast delay variation in the NTN scenario, which seriously affects the UE performance.
Specifically, in a Non-Terrestrial network (NTN) scenario, one cell may correspond to multiple beams (beams), or one cell may correspond to one beam. That is, in actual deployment, the coverage area of one beam may correspond to one cell, or the coverage areas of multiple beams may correspond to one cell.
Further, in the NTN scenario, the satellite operates based on a specific orbit, and its motion is regular, so that the propagation delay variation caused by the satellite motion is regular and predictable. For example, the network may indicate a delay variation rate or a doppler shift variation speed to the UE, and the UE may perform uplink synchronization (i.e., transmit timing advance adjustment) and frequency offset compensation according to the delay variation rate or the doppler shift variation speed.
The UE may also estimate, in advance, a change in the transmission timing advance and a change in the doppler frequency shift in combination with its own Global Navigation Satellite System (GNSS) capability and related ephemeris information (such as Satellite orbit, velocity, and the like), and further perform uplink synchronization (i.e., transmission timing advance adjustment) and frequency offset pre-compensation.
In addition, in the NTN scenario, the maximum differential delay value refers to: the difference between the propagation delay corresponding to the position farthest from the satellite and the propagation delay corresponding to the position closest to the satellite in a certain cell or beam coverage.
A message 1(Msg1) sent by the UE, that is, a Random Access preamble, is carried on a Physical Random Access Channel (PRACH) applied to a narrowband Internet of Things (Narrow Band Internet of Things, NB-IOT for short). The uplink random access preamble of NB-IOT is typically transmitted using a single frequency, and each random preamble contains multiple (e.g., 4, 6, or 8) Symbol groups (Symbol groups). The plurality of symbol groups corresponding to each random access preamble code are consecutive in time.
On the other hand, when transmitting message 1(Msg1), the UE of NB-IOT performs repeated transmission, and the repeated unit is a random access preamble. Currently, message 1(Msg1) can be repeatedly sent 128 times at most, i.e., a message 1(Msg1) transmission needs to be repeatedly sent 128 times at most. As can be seen here, the UE needs to send message 1(Msg1) once (including repeated transmission) for a long period of time.
The present inventors have analyzed that, due to the relatively long duration of one transmission (including repeated transmission) of the message 1(Msg1), the UE needs to perform multiple adjustments of the transmission timing advance or frequency offset during one transmission of the message 1(Msg1) to accommodate the fast propagation delay and doppler shift changes, considering the fast delay change (e.g., 35 μ s/s) and frequency offset change in the NTN scenario. However, the PRACH transmission in the prior art is generally implemented based on a terrestrial network, and in a terrestrial network scenario, even if one transmission of the message 1(Msg1) takes a long time, the transmission timing advance and frequency offset do not change drastically during the transmission, so that there is no need to adjust the transmission timing advance or frequency offset during the transmission. Therefore, the prior art has no processing mechanism for adjusting frequency offset or sending timing advance during one transmission of the message 1(Msg1) in the NTN scenario, so that the UE cannot cope with the fast delay change with the satellite.
Further, the inventor of the present application has analyzed that the UE needs a transmission gap (gap) when performing the frequency offset adjustment, that is, the UE cannot perform data transmission when performing the frequency offset adjustment.
Similarly, the UE needs to have a space for sending in advance to perform sending timing advance adjustment during the transmission of the message 1(Msg1), that is, to avoid overlapping with the previous sending part, a transmission gap needs to exist between the time domain resources corresponding to the two previous and next parts of data. Taking the scenarios described in fig. 1 and fig. 2 as an example, fig. 1 is a schematic diagram of performing transmission timing advance adjustment during message 1 transmission in a scenario that does not employ a transmission slot, and fig. 2 is a schematic diagram of performing transmission timing advance adjustment during message 1 transmission in a scenario that employs a transmission slot.
With continued reference to fig. 1, in a scenario where there are no transmission slots (also referred to as transmission gaps, gap for short), message 1 (i.e., message 1 before the illustrated adjustment) should be consecutive in time according to the provisions of the existing protocol. If the message 1 is divided into a plurality of data segments and segmented for transmission timing advance adjustment (i.e. advance transmission), since the TA values corresponding to different data segments may be different, it is very likely that a situation where partial transmission segments (i.e. data segments) overlap in the time domain occurs in the message 1 after transmission timing advance adjustment, which is not possible.
If the scenario of setting the transmission time slot shown in fig. 2 is adopted, the problem that the partial data segments of the adjusted message 1 overlap in the time domain can be effectively solved. With continued reference to fig. 2, since transmission slots are provided between the data segments of the message 1 before adjustment, the problem of time domain overlap does not occur when the transmission timing of the segments is adjusted in advance.
In summary, the current message 1(Msg1) sending has no special opportunity (i.e. time domain resource gap) designed for sending timing advance adjustment or frequency offset adjustment, so that the UE cannot cope with fast delay variation in the NTN scenario, thereby affecting the UE performance.
To solve the foregoing technical problem, an embodiment of the present invention provides a message transmission method for a physical random access channel, including: receiving transmission time slot configuration information; determining the time domain position of the transmission time slot according to the transmission time slot configuration information; and during the period of sending the first message through the physical random access channel, utilizing the transmission time slot to carry out frequency offset adjustment and/or sending timing advance adjustment.
Compared with the prior technical scheme of only carrying out frequency offset and sending timing advance pre-compensation before sending the first message, the embodiment enables the UE to better cope with rapid time delay change by setting special time for sending timing advance adjustment and/or frequency offset adjustment during sending the first message, and is beneficial to the UE performance in an NTN scene. Specifically, the time domain position of the transmission time slot, which needs to be adjusted in frequency offset and/or in sending timing advance, during the sending of the first message is determined based on the transmission time slot configuration information, so that the UE can adjust the sending timing advance and the frequency offset in time during the sending of the first message, and adapt to rapid delay and doppler shift changes in an NTN scene.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 3 is a flowchart of a first message transmission method for a physical random access channel according to an embodiment of the present invention. This embodiment may be performed by the user equipment side, such as by a UE of the user equipment side. For example, the UE may be an NB-IOT UE.
The embodiment can be applied to NTN scenes, and the UE communicates with the network side through a satellite. In addition, in this scenario, the satellite communicating with the UE is an unsynchronized satellite, so that the propagation delay between the UE and the satellite may change rapidly with time and doppler shift, which may cause uplink out-of-synchronization/frequency shift. With the present embodiment, by setting a special time (i.e., a transmission time slot) for transmission timing advance adjustment and/or frequency offset adjustment during transmission of the message 1(Msg1), the UE can perform adjustment of transmission timing advance and frequency offset in time during one transmission (including repeated transmission) of the message 1(Msg1), and no overlap in time domain occurs between data segments of the adjusted message 1.
In this embodiment, the message transmitted through the physical random access channel may be a message 1(Msg1), and for convenience of description, the message 1(Msg1) is referred to as a first message. Specifically, the first message may be a random access preamble.
Specifically, referring to fig. 3, the message transmission method for the physical random access channel according to this embodiment may include the following steps:
step S101, receiving transmission time slot configuration information;
step S102, determining the time domain position of the transmission time slot according to the configuration information of the transmission time slot;
step S103, during the period of sending the first message through the physical random access channel, the transmission time slot is utilized to carry out frequency offset adjustment and/or sending timing advance adjustment.
In one implementation, the transmission slot configuration information in step S101 may be carried by a broadcast message. For example, the broadcast message may include a System Information Block (SIB) and may further include a Master Information Block (MIB).
In one implementation, the transmission slot configuration information may be cell-level. The network may add the transmission timeslot configuration information to the broadcasted SIB or MIB, and a UE that needs to access the cell receives the SIB or MIB and acquires the transmission timeslot configuration information corresponding to the cell therefrom.
In a variation, the cell may correspond to a plurality of beams, and the transmission slot configuration information may be beam level or beam group level. The network may add the transmission slot configuration information in a broadcasted SIB or MIB, and a UE that needs to access the beam receives the SIB or MIB and acquires the transmission slot configuration information corresponding to the beam or a beam group to which the beam belongs.
In one implementation, the number of the transmission timeslots may be multiple and distributed during the transmission of the first message, so that the UE can frequently perform transmission timing advance adjustment and/or frequency offset adjustment during the transmission of the first message.
Specifically, the transmission period of the first message includes repeated transmission.
Further, a plurality of the transmission slots may be periodically distributed during the transmission of the first message. Accordingly, the transmission slot configuration information may be used to indicate the period and length of the transmission slot. Wherein, the length of the transmission time slot refers to the duration of a single transmission time slot in the time domain.
In one implementation, the transmission slot configuration information may include a period and a length of a transmission slot. That is, the network directly indicates the specific values of the period and the length by transmitting the slot configuration information.
Accordingly, the step S102 may include the steps of: and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot included in the transmission time slot configuration information.
In one implementation, the unit of the period of the transmission slot may be selected from: milliseconds, subframes, frames, and slots, etc. Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
Specifically, the UE determines a transmission slot cycle and a length of a first message corresponding to a current beam, cell, or beam group by receiving a broadcast message. When sending the first message, the UE may perform the sending timing advance adjustment and the frequency offset adjustment according to the period and the length of the transmission timeslot.
Assuming that the transmission slot configuration information includes a transmission slot having a period of 20 milliseconds (ms) and a length of 2ms, one transmission (including a repeated transmission) of the first message requires 100 ms. A transmission slot of length 2ms is inserted every 20ms during the transmission of the first message over the PRACH. Therefore, the UE can utilize the current transmission time slot of 2ms to carry out frequency offset adjustment and sending timing advance adjustment every 20 ms.
In a variation, the period of the transmission slot may have a unit of symbol group (symbol group). Wherein the first message comprises a plurality of repeated transmission units, wherein each repeated transmission unit comprises a plurality of symbol groups, and each symbol group comprises a Cyclic Prefix (CP) and a random access symbol group (T)SEQ). Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
In a first exemplary application scenario, referring to fig. 4, a network issues transmission timeslot configuration information of a first message corresponding to each beam (or beam group) of a local cell or a local cell to a UE through a broadcast message. The transmission slot configuration information includes an X value indicating that there will be one transmission slot every X symbol groups within the first message (i.e., the random access preamble) and a length of the transmission slot.
Further, after the UE determines the transmission timeslot configuration corresponding to the current beam or cell (or beam group) by receiving the broadcast message, the UE may perform the transmission timing advance adjustment and the frequency offset adjustment according to the transmission timeslot configuration when transmitting the first message.
For example, it is assumed that one random access preamble repetition unit (preamble repetition unit) includes 4 symbol groups, and the first message includes a plurality of the random access preamble repetition units (hereinafter, referred to as repetition transmission units), that is, one transmission (including repetition transmission) of the first message is repeatedly transmitted in units of the random access preamble repetition units. Assuming that the X value of the network configuration is 2 and the length of the transmission slot is 2ms, referring to fig. 4, a transmission slot of 2ms length is inserted every two symbol groups. Correspondingly, the UE may perform frequency offset adjustment and transmission timing advance adjustment every 2 symbol groups by using the current 2ms transmission slot.
In this variant, the single random access preamble repetition unit may correspond to a single random access preamble of the prior art, differing from the existing random access preamble in that the groups of symbols in the single random access preamble repetition unit in this variant are no longer consecutive in time, but may be inserted into one or more transmission slots.
In a variation, the unit of the period of the transmission slot may be a repeated transmission unit of the first message. That is, the first message is inserted into one transmission slot per repeated transmission or more. Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
In a second exemplary application scenario, referring to fig. 5, a network issues transmission timeslot configuration information of a first message corresponding to each beam (or beam group) of a local cell or a local cell to a UE through a broadcast message. The transmission slot configuration information includes an N value indicating that there will be one transmission slot every N random access preamble repeated transmissions and a length of the transmission slot. In this application scenario, the random access preamble transmitted repeatedly at each time is the first message.
Further, after the UE determines the transmission timeslot configuration corresponding to the current beam or cell (or beam group) by receiving the broadcast message, the UE may perform the transmission timing advance adjustment and the frequency offset adjustment according to the transmission timeslot configuration when transmitting the first message.
For example, assume that a single first message (i.e., the random access preamble) includes 4 symbol groups, the network configuration has an N value of 2, and the length of the transmission slot is 2 ms. Then referring to fig. 5, a transmission slot of 2ms length is inserted every 2 first messages (i.e., random access preambles). Correspondingly, the UE may perform frequency offset adjustment and transmit timing advance adjustment every 2 times of preamble repeated transmission by using the current 2ms transmission slot.
In this variation, the symbol groups in a single duplicate transmission unit are consecutive in time, and it is possible to insert a transmission slot between two adjacent duplicate transmission units.
In one implementation, the transmission slot configuration information may include a format (format) of a physical random access channel, where the different formats of the physical random access channel correspond to different periods and lengths of transmission slots.
Specifically, multiple PRACH formats may be predefined by a protocol, and different PRACN formats correspond to different transmission slot configurations, such as different transmission slot periods and different transmission slot lengths.
For example, on the basis of the existing three PRACH formats, multiple PRACH formats are additionally defined and respectively correspond to different periods and lengths of transmission slots.
Further, different PRACH formats may correspond to different PRACH transmission parameters, such as different subcarrier intervals.
Further, different PRACH formats may correspond to different scenarios, for example, the coverage area corresponding to PRACH format 1 is smaller, and the coverage area corresponding to PRACH format 2 is larger.
Therefore, in this embodiment, the period and the length of the transmission timeslot may be indicated to the UE through a broadcast message in an implicit indication manner.
Accordingly, the step S102 may include the steps of: determining the period and the length of the corresponding transmission time slot according to the format of the physical random access channel included in the transmission time slot configuration information; and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot.
In one implementation, the unit of the period of the transmission slot may be selected from: milliseconds, subframes, frames, and slots, etc. Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
In a third typical application scenario, the network issues the format of the PRACH corresponding to the local cell or each beam (or beam group) of the local cell to the UE through a broadcast message.
And the UE determines the format of the PRACH corresponding to the current beam, cell or beam group by receiving the broadcast message, and further determines the period and length of the transmission time slot corresponding to the format of the PRACH according to the corresponding relation preset by the protocol. Further, when sending the first message, the UE may perform the sending timing advance adjustment and the frequency offset adjustment according to the determined period and length of the transmission timeslot.
Assuming that the period of a transmission slot corresponding to the format of the currently received PRACH is 20 milliseconds (ms), and the length is 2ms, one transmission (including repeated transmission) of the first message needs 100 ms. A transmission slot of length 2ms is inserted every 20ms during the transmission of the first message over the PRACH. Therefore, the UE can utilize the current transmission time slot of 2ms to carry out frequency offset adjustment and sending timing advance adjustment every 20 ms.
In a variation, the period of the transmission slot may have a unit of symbol group (symbol group). Wherein the first message comprises a plurality of repeating transmission units, wherein each repeating transmission unit comprises a plurality of the symbol groups. Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
In a fourth exemplary application scenario, the protocol defines a plurality of PRACH formats in advance, and different PRACH formats correspond to different X values and lengths of transmission slots. Where the X value indicates that there will be one transmission slot every X symbol groups within the first message (i.e., the random access preamble). The network sends the format of the PRACH corresponding to the cell or each beam (or beam group) of the cell to the UE through the broadcast message.
Further, after the UE determines the format of the PRACH corresponding to the current beam or cell (or beam group) by receiving the broadcast message, the UE may perform the transmission timing advance adjustment and the frequency offset adjustment according to the transmission time slot configuration corresponding to the format of the PRACH when transmitting the first message.
For example, it is assumed that one random access preamble repeating unit includes 4 symbol groups, and the first message includes a plurality of the random access preamble repeating units, i.e., one transmission (including a repeated transmission) of the first message is repeatedly transmitted in units of the random access preamble repeating units. Assuming that an X value corresponding to a format of the PRACH sent by the network is 2, a length of a transmission time slot is 2ms, and a transmission time slot with a length of 2ms is inserted every two symbol groups, at this time, a relative position of the transmission time slot and the first message may be as shown in fig. 4. Correspondingly, the UE may perform frequency offset adjustment and transmission timing advance adjustment every 2 symbol groups by using the current 2ms transmission slot.
In a variation, the unit of the period of the transmission slot may be a repeated transmission unit of the first message. That is, the first message is inserted into one transmission slot per repeated transmission or more. Further, the unit of the length of the transmission slot may also be selected from: milliseconds, subframes, frames, and slots, etc.
In a fifth exemplary application scenario, the protocol defines a plurality of PRACH formats in advance, and different PRACH formats correspond to different values of N and lengths of transmission slots. Wherein the N value indicates that there will be one transmission slot every N random access preamble repeat transmissions. In this application scenario, the random access preamble transmitted repeatedly at each time is the first message. The network sends the format of the PRACH corresponding to the cell or each beam (or beam group) of the cell to the UE through the broadcast message.
Further, after the UE determines the format of the PRACH corresponding to the current beam or cell (or beam group) by receiving the broadcast message, the UE may perform the transmission timing advance adjustment and the frequency offset adjustment according to the received transmission time slot configuration corresponding to the PRACH format when transmitting the first message.
For example, it is assumed that a single first message (i.e., the random access preamble) includes 4 symbol groups, the PRACH format issued by the network corresponds to an N value of 2, and the length of the transmission slot is 2 ms. A 2ms long transmission slot is inserted every 2 first messages (i.e., random access preamble) and the relative positions of the transmission slot and the first messages can be as shown in fig. 5. Correspondingly, the UE may perform frequency offset adjustment and transmit timing advance adjustment every 2 times of preamble repeated transmission by using the current 2ms transmission slot.
In a specific implementation, in the step S103, only the transmission timing advance adjustment, only the frequency offset adjustment, or both the transmission timing advance adjustment and the frequency offset adjustment may be performed as needed.
In one implementation, the sending of the first message may not be performed during the frequency offset adjustment.
Therefore, at the UE side, by setting the special time for the transmission timing advance adjustment and/or the frequency offset adjustment during the first message transmission, the UE can better cope with the rapid delay change, which is beneficial to the UE performance in the NTN scenario. Specifically, the time domain position of the transmission time slot, which needs to be adjusted in frequency offset and/or in sending timing advance, during the sending of the first message is determined based on the transmission time slot configuration information, so that the UE can adjust the sending timing advance and the frequency offset in time during the sending of the first message, and adapt to rapid delay and doppler shift changes in an NTN scene.
Fig. 6 is a schematic structural diagram of a first message transmission apparatus for a physical random access channel according to an embodiment of the present invention. Those skilled in the art understand that the message transmission apparatus 2 for physical random access channel (abbreviated as message transmission apparatus 2) described in this embodiment may be used to implement the method technical solutions described in the embodiments of fig. 3 to fig. 5.
Specifically, referring to fig. 6, the message transmission apparatus 2 for the physical random access channel according to this embodiment may include: a receiving module 21, configured to receive transmission timeslot configuration information; a determining module 22, configured to determine a time domain position of the transmission timeslot according to the transmission timeslot configuration information; a transmission module 23, configured to perform frequency offset adjustment and/or transmit timing advance adjustment by using the transmission timeslot during sending the first message through the physical random access channel.
For more contents of the operation principle and the operation mode of the message transmission apparatus 2, reference may be made to the related descriptions in fig. 3 to fig. 5, which are not described herein again.
Fig. 7 is a flowchart of a second message transmission method for a physical random access channel according to a second embodiment of the present invention. This embodiment may be performed by the network side, e.g. by a base station of the network side.
Specifically, referring to fig. 7, the message transmission method for the physical random access channel according to this embodiment may include the following steps:
step S301, determining a time domain position of a transmission time slot during transmission of a first message through the physical random access channel according to a frequency offset and/or a change speed of a sending timing advance, wherein the transmission time slot is used for adjusting the frequency offset and/or the sending timing advance;
step S302, generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot.
Those skilled in the art understand that the step S301 and the step S302 can be regarded as execution steps corresponding to the step S101 to the step S103 in the above-mentioned embodiment shown in fig. 3, and they are complementary in terms of specific implementation principle and logic. Therefore, the explanation of the terms in this embodiment can refer to the description of the embodiment shown in fig. 3, and will not be repeated here.
In a specific implementation, before the step S301, the message transmission method according to this embodiment may further include the steps of: and determining the frequency deviation and/or the change speed of the sending timing advance according to the satellite ephemeris information, the orbit of the satellite, the cell position information and/or the UE position information.
Specifically, the change speed of the timing advance or the frequency offset sent between the UE and the satellite may be calculated according to the satellite ephemeris information, the orbit of the satellite, the cell location information, and/or the UE location information.
Further, in step S301, a relevant configuration of a transmission timeslot when the corresponding cell, beam, or beam group transmits the first message through the PRACH may be determined according to the change speed. For example, if the variation speed is fast, the period of the transmission time slot may be set to be shorter, so that the distribution of the transmission time slots is more compact. For another example, if the variation speed is slow, the period of the transmission slot may be set relatively long, so that the distribution of the transmission slot is a little sparse.
In one implementation, the number of transmission slots may be multiple and distributed during the transmission of the first message.
In one implementation, the transmission slot configuration information may include a period and a length of a transmission slot.
In one implementation, the transmission slot configuration information may include formats of physical random access channels, where the different formats of the physical random access channels correspond to different periods and lengths of the transmission slots.
In one implementation, the unit of the period of the transmission slot may be selected from: a millisecond, a subframe, a frame, a slot, a group of symbols, and a repeating transmission unit of the first message, wherein a single repeating transmission unit of the first message includes a plurality of the groups of symbols.
In one implementation, the transmission slot configuration information may be cell level, beam level, or beam group level.
In one implementation, the transmission slot configuration information may be sent via a broadcast message.
Therefore, at the network side, the transmission time slot for performing the sending timing advance adjustment and/or the frequency offset adjustment during the first message transmission period can be configured for the UE in advance according to the frequency offset and/or the change speed of the sending timing advance, so that the UE can better cope with the rapid delay change during the first message transmission period.
Fig. 8 is a schematic structural diagram of a second message transmission apparatus for a physical random access channel according to an embodiment of the present invention. Those skilled in the art understand that the message transmission apparatus 4 for physical random access channel (abbreviated as message transmission apparatus 4) described in this embodiment may be used to implement the method technical solution described in the embodiment of fig. 7.
Specifically, referring to fig. 8, the message transmission apparatus 4 according to this embodiment may include: a determining module 41, configured to determine, according to a frequency offset and/or a change speed of a sending timing advance, a time domain position of a transmission time slot during transmission of a first message through the physical random access channel, where the transmission time slot is used to perform frequency offset adjustment and/or sending timing advance adjustment; and a sending module 42, configured to generate transmission timeslot configuration information according to the time domain position of the transmission timeslot and send the transmission timeslot configuration information.
For more details on the operation principle and the operation mode of the message transmission apparatus 4, reference may be made to the related description in fig. 7, which is not described herein again.
Further, the embodiment of the present invention also discloses a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method technical solution described in the embodiments shown in fig. 3 to fig. 5 is executed. Alternatively, the computer program is executed by a processor to execute the method technical solution described in the embodiment shown in fig. 7. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 3 to 5 when running the computer program. Specifically, the terminal may be a UE.
Further, an embodiment of the present invention further discloses a base station, which includes a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 7 when running the computer program.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (23)

1. A message transmission method for a physical random access channel, comprising:
receiving transmission time slot configuration information;
determining the time domain position of the transmission time slot according to the transmission time slot configuration information;
and during the period of sending the first message through the physical random access channel, utilizing the transmission time slot to carry out frequency offset adjustment and/or sending timing advance adjustment.
2. The message transmission method according to claim 1, wherein the number of the transmission slots is plural and distributed during the transmission of the first message.
3. The message transmission method according to claim 1, wherein the transmission slot configuration information includes a period and a length of a transmission slot.
4. The message transmission method according to claim 3, wherein the determining the time domain position of the transmission slot according to the transmission slot configuration information comprises:
and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot included in the transmission time slot configuration information.
5. The message transmission method according to claim 1, wherein the transmission slot configuration information includes a format of a physical random access channel, wherein different formats of the physical random access channel correspond to different periods and lengths of the transmission slots.
6. The message transmission method according to claim 5, wherein the determining the time domain position of the transmission slot according to the transmission slot configuration information comprises:
determining the period and the length of the corresponding transmission time slot according to the format of the physical random access channel included in the transmission time slot configuration information;
and determining the time domain position of each transmission time slot according to the period and the length of the transmission time slot.
7. The message transmission method according to any of claims 3 to 6, wherein the unit of the period of the transmission slot is selected from the group consisting of: a millisecond, a subframe, a frame, a slot, a group of symbols, and a repeating transmission unit of the first message, wherein a single repeating transmission unit of the first message includes a plurality of the groups of symbols.
8. The message transmission method according to claim 1, wherein the transmission slot configuration information is at a cell level, a beam group level, or a beam level.
9. The message transmission method according to claim 1, wherein the transmission slot configuration information is carried by a broadcast message.
10. The method of claim 1, wherein the sending of the first message is not performed during the frequency offset adjustment.
11. A message transmission apparatus for a physical random access channel, comprising:
a receiving module, configured to receive transmission timeslot configuration information;
a determining module, configured to determine a time domain position of the transmission timeslot according to the transmission timeslot configuration information;
and the transmission module is used for carrying out frequency offset adjustment and/or sending timing advance adjustment by utilizing the transmission time slot during the period of sending the first message through the physical random access channel.
12. A message transmission method for a physical random access channel, comprising:
determining a time domain position of a transmission time slot during the transmission of the first message through the physical random access channel according to the frequency offset and/or the change speed of the sending timing advance, wherein the transmission time slot is used for adjusting the frequency offset and/or the sending timing advance;
and generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot.
13. The message transmission method according to claim 12, wherein before determining the time domain position of the transmission slot during the transmission of the first message over the physical random access channel based on the frequency offset and/or the speed of change of the transmission timing advance, further comprising:
and determining the frequency deviation and/or the change speed of the sending timing advance according to the satellite ephemeris information, the orbit of the satellite, the cell position information and/or the UE position information.
14. The message transmission method according to claim 12, wherein the number of the transmission slots is plural and distributed during the transmission of the first message.
15. The message transmission method according to claim 12, wherein the transmission slot configuration information includes a period and a length of a transmission slot.
16. The message transmission method according to claim 12, wherein the transmission slot configuration information comprises formats of physical random access channels, wherein different formats of the physical random access channels correspond to different periods and lengths of the transmission slots.
17. The message transmission method according to claim 15 or 16, wherein the unit of the period of the transmission slot is selected from the group consisting of: a millisecond, a subframe, a frame, a slot, a group of symbols, and a repeating transmission unit of the first message, wherein a single repeating transmission unit of the first message includes a plurality of the groups of symbols.
18. The message transmission method according to claim 12, wherein the transmission slot configuration information is at a cell level, a beam level or a beam group level.
19. The message transmission method according to claim 12, wherein the transmission slot configuration information is transmitted through a broadcast message.
20. A message transmission apparatus for a physical random access channel, comprising:
a determining module, configured to determine, according to a frequency offset and/or a change speed of a sending timing advance, a time domain position of a transmission time slot during transmission of a first message through the physical random access channel, where the transmission time slot is used to perform frequency offset adjustment and/or sending timing advance adjustment;
and the sending module is used for generating and sending the configuration information of the transmission time slot according to the time domain position of the transmission time slot.
21. A storage medium having a computer program stored thereon, the computer program, when executed by a processor, performing the steps of the method of any of claims 1 to 10, or of any of claims 12 to 19.
22. A terminal comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 10.
23. A base station comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 12 to 19.
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