WO2021109140A1

WO2021109140A1 - Random access method, resource configuration method, network side device, user equipment

Info

Publication number: WO2021109140A1
Application number: PCT/CN2019/123750
Authority: WO
Inventors: 卢前溪; 尤心
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2021-06-10
Also published as: CN114375607A; CN114375607B

Abstract

Disclosed in the present application are a random access method, a resource configuration method, a network side device, and a user equipment. The random access method comprises: a user equipment determines a coverage area where the user equipment is located, wherein the coverage area is any of at least two coverage areas in a cell where the user equipment is located; the user equipment obtains a random access channel resource and/or a preamble group corresponding to the coverage area; the user equipment performs random access using the random access channel resource and/or the preamble group. Embodiments of the present application also provide a resource configuration method, the method comprising: a network side device divides a cell into at least two coverage areas; the network side device configures random access channel resources and/or preamble groups for the at least two coverage areas, respectively; the network side device sends a random access channel resource and/or a preamble group to a user equipment of the cell.

Description

Random access method, resource configuration method, network side equipment, user equipment

Technical field

This application relates to the field of communications, and specifically, to a random access method, a resource configuration method, network side equipment, and user equipment.

Background technique

At present, the coverage area of the New Radio (NR) system is relatively small. The signal transmission delays between User Equipment (UE) and base stations located in different locations in the same cell are not much different. During the random access process, when the UE sends the preamble, it uses the same random access channel (Random Access Channel, referred to as RACH time-frequency resource (that is, the same random access channel opportunity (RACH Occasion, referred to as RO)) The time for the premable sent by different UEs to reach the base station is within one RO time. In this way, the base station can know the time when the UE sends the preamble after receiving the preamble, and thus can determine the UE's Timing Advance (TA) and give it to the UE. Random Access Radio Network Temporary Identifier (RA-RNTI) used when sending Random Access Response (RAR).

Compared with the cellular network adopted by the traditional NR, the signal propagation delay between the UE and the satellite in the non-terrestrial network (Non-Terrestrial Network, referred to as NTN) is greatly increased. In addition, due to the large coverage area of satellites, for different UEs in the same satellite coverage area, due to their different locations, signal transmission delays between different UEs and satellites may also have large differences. According to the discussion of NTN application scenarios in the Rel-16 standardization process, the maximum difference in signal transmission delay between different UEs and base stations in an NTN cell is 10.3 ms. Such a large signal transmission delay difference will cause preambles sent by different UEs that use the same RACH resource to arrive at the base station at different times. In order to ensure that the base station can receive the preamble sent by different UEs in the cell, the length of the preamble reception window on the base station side should be extended to T=2*(AB), where T is the length of the preamble reception window, A is the maximum one-way delay, and B It is the smallest one-way delay, as shown in Figure 1.

After receiving the preamble, the base station needs to know which RO the UE sent the preamble, so as to determine the initial TA of the UE. In NTN, as shown in Figure 2, due to the need to introduce a longer preamble receiving window, if the time interval between adjacent ROs in the time domain is less than the length of the preamble receiving window, random access at different times will occur The problem that the preamble receiving window corresponding to the channel opportunity RO overlaps in the time domain, so that the base station receives the preamble in the overlapping area of multiple preamble receiving windows, it cannot know which RO the UE sent the preamble, and cannot determine the UE’s TA.

In view of the ambiguity of the preamble receiving window that may occur on the network side in NTN, one way of thinking is to ensure that the time interval between adjacent ROs in the time domain is not less than the length of the RACH receiving window when configuring RACH resources. The disadvantage of this method is that it will reduce RACH capacity.

From the above analysis, it can be seen that the length of the preamble receiving window on the network side needs to be extended in NTN, and the requirement for the length of the preamble receiving window is directly related to the coverage area of the NTN cell. The larger the coverage area of the cell, the longer the preamble receiving window needs to be supported. The longer it is, the more it is necessary to support a preamble receiving window of up to 20.6 ms for a geosynchronous orbit (Geostationary Earth Orbit, referred to as GEO) scenario. The expansion of the length of the preamble receiving window, on the one hand, brings great challenges to the implementation of the network side, and on the other hand, it will cause the reduction of RACH capacity.

In view of the above-mentioned problems, no effective solutions have yet been proposed.

Summary of the invention

The embodiments of the present application provide a random access method, a resource configuration method, a network side device, and a user equipment to at least solve the problem that a cell with a larger coverage area needs to support a longer RACH reception window length in the related art, which leads to the network The side implementation complexity is high, and the technical problem of reducing the RACH capacity.

According to an aspect of the embodiments of the present application, a random access method is provided, including: a user equipment determines a coverage area where the user equipment is located, where the coverage area is at least two coverage areas in a cell where the user equipment is located Any one of the coverage areas in the coverage area; the user equipment obtains the random access channel resource and/or preamble group corresponding to the coverage area; the user equipment uses the random access channel resource and/or preamble group to perform random Access.

Optionally, the user equipment determining the coverage area in which the user equipment is located includes: the user equipment measuring the reference signal receiving power (RSRP) of the user equipment; the user equipment determining the The reference signal received power range to which the reference signal received power belongs; the user equipment determines a coverage area corresponding to the reference signal received power range, and uses the determined coverage area as the coverage area where the user equipment is located.

Optionally, 2 times the maximum signal transmission delay difference between the ground position in each of the at least two coverage areas and the satellite is not greater than the length of the random access channel reception window on the network side.

Optionally, that the user equipment uses the random access channel resource and/or the preamble group to access includes: the user equipment determines the preamble group corresponding to the coverage area where the user equipment is located; A preamble is selected from the determined preamble group and sent to the network side device for random access.

Optionally, the access by the user equipment using the random access channel resource and/or preamble group includes: the user equipment determining the first random access channel corresponding to the coverage area where the user equipment is located Resource configuration, wherein the type of the first random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration, random access channel time-frequency resource configuration; based on the first random access channel resource Configuration, the user equipment selects a first random access channel resource for random access, where the first random access channel resource includes one of the following: random access channel frequency domain resources, random access channel time-frequency resources Resources.

Optionally, the access by the user equipment using the random access channel resource and/or preamble group includes: the user equipment determining a second random access channel corresponding to the coverage area where the user equipment is located Resource configuration, wherein the type of the second random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, And, the user equipment selects a designated preamble from the preamble group corresponding to the coverage area in which the user equipment is located, and the designated preamble is used to send to the network side device; based on the second random access Channel resource configuration and the designated preamble, the user equipment selects a second random access channel resource for random access, where the second random access channel resource includes one of the following: random access channel frequency domain Resources, random access channel time domain resources, random access channel time-frequency resources.

Optionally, the cell includes: any cell that is not covered by a terrestrial communication network.

According to another aspect of the embodiments of the present application, a resource configuration method is provided, which includes: a network-side device divides a cell into at least two coverage areas; the network-side device configures random access for the at least two coverage areas, respectively. Incoming channel resource and/or preamble group; the network side device sends the random access channel resource and/or preamble group to the user equipment of the cell.

Optionally, the network-side device dividing the cell into at least two coverage areas includes: the network-side device divides the cell into the at least two coverage areas based on at least one reference signal received power threshold, where: Different coverage areas correspond to different reference signal received power ranges, and the reference signal received power range is determined based on the at least one reference signal received power threshold.

Optionally, the network side device configures a preamble group for each of the at least two coverage areas, and there is no intersection between the preamble groups corresponding to different coverage areas.

Optionally, the number of the at least two coverage areas and the at least two preamble groups is N, where N is a natural number greater than or equal to 2; the at least two preamble groups pass one of the following The method is determined: N initial preamble root sequences are configured, and the N initial preamble root sequences are cyclically shifted to obtain N preamble groups; when an initial preamble root sequence is configured, all The available preamble set obtained by cyclic shifting the one initial preamble root sequence is divided into N groups, and the N preamble groups are obtained.

Optionally, the network-side device separately configuring random access channel resources and/or preamble groups for the at least two coverage areas includes:

The network side device configures at least two first random access channel resource configurations for the at least two coverage areas, wherein the type of the first random access channel resource configuration includes one of the following: random access channel Frequency domain resource configuration, random access channel time-frequency resource configuration, random access channel frequency domain resource configuration; frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and different random access The frequency domain resources in the channel time-frequency resource configuration do not overlap in the frequency domain.

Optionally, the method further includes: the network-side device separately activates at least two random access channel receiving windows for the at least two coverage areas, each of the at least two random access channel receiving windows The start time of the random access channel receiving window is determined according to the signal transmission delay between the perigee in the corresponding coverage area and the network side device.

Optionally, the network-side device configuring random access channel resources and/or preamble groups for the at least two coverage areas respectively includes: the network-side device configuring at least two random access channel resources and/or preamble groups for the at least two coverage areas The second random access channel resource configuration, wherein the type of the second random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration, random access channel time domain resource configuration, random access Channel time-frequency resource configuration, frequency domain resources in different random access channel frequency domain resource configurations do not overlap in frequency domain, and frequency domain resources in different random access channel time-frequency resource configurations do not overlap in frequency domain of.

Optionally, the method further includes: the correspondence between the at least two coverage areas and the random access channel resources is indicated by explicit signaling or determined in a predefined manner.

Optionally, the number of the at least two coverage areas is N; the value of N is determined by one of the following methods: according to the maximum signal transmission delay difference between each ground position in the cell coverage area and the satellite and the network The length of the receiving window of the random access channel on the side is determined; a predefined way.

According to another aspect of the embodiments of the present application, there is provided a resource configuration method, including: a network side device divides a cell into multiple coverage areas; the network side device allocates channel resources for the multiple coverage areas; The network side device sends the channel resource to the user equipment in the multiple coverage areas.

Optionally, the network-side device allocating channel resources for the multiple coverage areas includes: the network-side device separately configures random access channel resources and/or preamble groups for the multiple coverage areas.

Optionally, the network-side device separately configures random access channel resources and/or preamble groups for the multiple coverage areas, including: the network-side device is each of the multiple coverage areas Configure a preamble group respectively, and there is no intersection between the preamble groups corresponding to different coverage areas.

Optionally, the network-side device configuring random access channel resources and/or preamble groups for the multiple coverage areas respectively includes: the network-side device configuring each of the multiple coverage areas Zone configuration first random access channel resource configuration, where the type of the first random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration, random access channel time-frequency resource configuration, random Access channel frequency domain resource configuration; frequency domain resources in different random access channel frequency domain resource configurations do not overlap in frequency domain, and frequency domain resources in different random access channel time-frequency resource configurations are in frequency domain Non-overlapping.

Optionally, the network-side device separately configures random access channel resources and/or preamble groups for the multiple coverage areas, including: the network-side device is each of the multiple coverage areas Configure the second random access channel resource configuration respectively, where the type of the second random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration, random access channel time domain resource configuration, random Access channel time-frequency resource configuration, the frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and the frequency domain resources in the different random access channel time-frequency resource configuration are in the frequency domain. Non-overlapping.

According to another aspect of the embodiments of the present application, there is provided a network side device, including: a signal transceiving circuit and a processor; wherein the processor is configured to divide a cell into at least two coverage areas; Two coverage areas are respectively configured with random access channel resources and/or preamble groups; the signal transceiver circuit is configured to send the random access channel resources and/or preamble groups to the at least two coverage areas User equipment.

Optionally, the processor is further configured to divide the cell into the at least two coverage areas based on at least one reference signal received power threshold, where different coverage areas correspond to different reference signal received power ranges The reference signal received power range is determined based on the at least one reference signal received power threshold.

Optionally, the processor is further configured to configure at least two preamble groups for the at least two coverage areas, wherein the at least two preamble groups and the at least two coverage areas have a one-to-one correspondence Yes, there is no intersection between the at least two preamble groups.

Optionally, the processor is further configured to configure at least two random access channel frequency domain resource configurations for the at least two coverage areas, wherein the at least two random access channel frequency domain resource configurations are related to the frequency domain resource configuration of the at least two random access channels. The at least two coverage areas have a one-to-one correspondence, and the frequency domain resources in each random access channel frequency domain resource configuration in the at least two random access channel frequency domain resource configurations do not overlap in the frequency domain.

Optionally, the processor is further configured to configure a random access channel time-domain resource configuration and a preamble group for each of the at least two coverage areas, wherein the different coverage areas correspond to There is no intersection between the preamble groups.

Optionally, the processor is further configured to configure at least two random access channel time-frequency resource configurations for the at least two coverage areas, the at least two random access channel time-frequency resource configurations and the at least two The two coverage areas have a one-to-one correspondence, and the time domain resources in each random access channel time domain resource configuration in the at least two random access channel time domain resource configurations do not overlap in the time domain.

According to another aspect of the embodiments of the present application, there is provided a user equipment, including: a signal transceiving circuit and a processor; wherein the signal transceiving circuit is configured to receive a random access channel resource corresponding to a coverage area in which the user equipment is located And/or preamble group; the processor is configured to determine the coverage area where the user equipment is located, and use the random access channel resource and/or preamble group to perform random access, wherein the coverage area is the Any one of at least two coverage areas in the cell where the user equipment is located.

Optionally, the processor is further configured to measure the reference signal received power of the user equipment; determine the reference signal received power range to which the reference signal received power belongs; and determine the reference signal received power range corresponding to the reference signal received power range Coverage area, and use the determined coverage area as the coverage area where the user equipment is located.

Optionally, the processor is further configured to determine a preamble group corresponding to the coverage area where the user equipment is located; and select a preamble from the determined preamble group and send it to the network side device to Perform random access.

Optionally, the processor is further configured to determine a random access channel frequency domain resource corresponding to the coverage area where the user equipment is located, and perform random access based on the determined random access channel frequency domain resource.

Optionally, the processor is further configured to determine a random access channel time domain resource corresponding to the coverage area where the user equipment is located; from the preamble group corresponding to the coverage area where the user equipment is located Select a preamble to send to the network side device; and perform random access based on the determined random access channel time domain resource and the selected preamble.

Optionally, the processor is further configured to determine a random access channel time-frequency resource corresponding to the coverage area where the user equipment is located; and perform random access based on the determined random access channel time-frequency resource.

According to another aspect of the embodiments of the present application, a communication system is provided, including: a network-side device and a user equipment, wherein: the network-side device is configured to divide a cell into at least two coverage areas; Two coverage areas are respectively configured with random access channel resources and/or preamble groups; and the random access channel resources and/or preamble groups are sent to user equipments in the at least two coverage areas; said The user-side equipment is configured to determine the coverage area where the user equipment is located, and perform random access based on random access channel resources and/or preamble groups corresponding to the coverage area.

According to another aspect of the embodiments of the present application, there is provided a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein the non-volatile storage is controlled while the program is running The device where the medium is located executes the random access method or resource configuration method described above.

According to another aspect of the embodiments of the present application, a processor is provided, the processor is configured to run a program stored in a memory, wherein the random access method or resource configuration described above is executed when the program is running. method.

In the embodiment of the present application, the cell where the user equipment is located is divided into at least two coverage areas, and the access channel resources and/or preamble groups are allocated to the at least two coverage areas. It is divided into multiple coverage areas with a relatively small coverage area, and corresponding resources are allocated to each coverage area. Therefore, the RACH receiving window length on the network side can be effectively controlled, thereby avoiding the excessively long RACH receiving window length on the network. At the same time, it alleviates the impact of the expansion of the RACH reception window length on the RACH capacity, and thus solves the need to support a relatively long RACH reception window length in the cell with a larger coverage area in the related technology, which leads to the complexity of the network side implementation High, and the technical problem of reducing the RACH capacity.

Description of the drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Fig. 1 is a schematic diagram of an expansion principle of a preamble receiving window in NTN according to related technologies;

FIG. 2 is a schematic diagram of a fuzzy reception window of a network-side preamble according to related technologies;

Figure 3a is a schematic diagram of a contention-based random access process according to related technologies;

Figure 3b is a schematic diagram of a non-competition-based random access process according to related technologies;

Fig. 4 is a schematic structural diagram of a communication system according to an embodiment of the present application;

Fig. 5 is a schematic flowchart of a random access method according to an embodiment of the present application;

Fig. 6 is a schematic diagram of an optional coverage area division principle according to an embodiment of the present application;

Fig. 7 is a schematic diagram of an optional resource configuration based on the coverage area divided in Fig. 6 according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another optional coverage area division principle according to an embodiment of the present application;

FIG. 9 is a schematic diagram of an optional resource configuration based on the coverage area divided in FIG. 8 according to an embodiment of the present application;

FIG. 10 is a schematic diagram of another optional coverage area division principle according to an embodiment of the present application;

FIG. 11 is a schematic diagram of an optional resource configuration based on the coverage area divided in FIG. 10 according to an embodiment of the present application;

FIG. 12 is a schematic diagram of another optional coverage area division principle according to an embodiment of the present application;

FIG. 13 is a schematic diagram of an optional resource configuration based on the coverage area divided in FIG. 10 according to an embodiment of the present application;

Fig. 14 is a schematic flowchart of a resource configuration method according to an embodiment of the present application;

15 is a schematic flowchart of another resource configuration method according to an embodiment of the present application;

FIG. 16 is a schematic structural diagram of a network device according to an embodiment of the present application;

Fig. 17 is a schematic structural diagram of a user equipment according to an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the application, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only These are a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

It should be noted that the terms "first" and "second" in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

In order to better understand the embodiments of the present application, some technical terms and related communication processes involved in the embodiments of the present application are briefly described as follows:

NTN technology: NTN generally uses satellite communication to provide communication services to ground users. Communication satellites are classified into Low-Earth Orbit (LEO) satellites, Medium-Earth Orbit (MEO) satellites, Geostationary Earth Orbit (GEO) satellites, and high-altitude orbital satellites. High Elliptical Orbit (HEO) satellites, etc. The main research at this stage is LEO and GEO, among which:

LEO: The altitude range of low-orbit satellites is 500km-1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite viewing time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirement of the user equipment is not high.

GEO: A geosynchronous orbit satellite with an orbit height of 35786km and a rotation period of 24 hours around the earth. The signal propagation delay of single-hop communication between users is generally 250ms. In order to ensure the coverage of satellites and increase the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. Ground area.

NR random access: The random access process can be triggered by the following events: the UE establishes a wireless connection during initial access: the UE goes from the RRC_IDLE state to the RRC_CONNECTED state; the radio resource control (Radio Resource Control, referred to as RRC) connection re-establishment process: so that the UE Reestablish the wireless connection after the radio link fails; handover: UE needs to establish uplink synchronization with the new cell; in RRC_CONNECTED state, DL data arrives, and UL is in out-of-synchronization state; in RRC_CONNECTED state, UL data arrives, and UL is in Out-of-synchronization state or no Physical Uplink Control Channel (PUCCH) resource for sending scheduling request (Scheduling Request, referred to as SR); SR failure; synchronous reconfiguration request from RRC; E from RRC_INACTIVE state Transform to RRC_CONNECTED state; establish time alignment during the process of adding Secondary Cell (SCell); request other SI; beam failure recovery

In the NR Rel-15 version, the following two random access methods are mainly supported, the contention-based random access method and the non-competition-based random access method. The contention-based random access process shown in Figure 3a is divided into 4 Step, the non-contention-based random access process shown in Figure 3b is divided into two steps. As shown in Figures 3a and 3b, the steps of the random access process are as follows:

The user equipment sends Msg1 to the network side equipment;

The user equipment selects the PRACH resource and sends the selected preamble on the selected PRACH. If it is based on non-contention random access, the PRACH resource and preamble can be specified by the base station. Based on the preamble, the base station can estimate the uplink Timing and the grant size required for the user equipment to transmit Msg3;

The network side equipment sends RAR to the user equipment;

After the user equipment sends Msg1, a random access response time window ra-ResponseWindow is opened, and the RA-RNTI scrambled PDCCH is monitored in the window. The calculation of RA-RNTI is as follows:

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

That is, the RA-RNTI is related to the PRACH time-frequency resources used by the UE to send Msg1.

After the user equipment successfully receives the PDCCH scrambled by the RA-RNTI, the user equipment can obtain the PDSCH scheduled by the PDCCH, which contains the RAR (Random Access Response), and the RAR specifically contains the following information:

The subheader of RAR contains BI, which is used to indicate the back-off time of retransmission of Msg1;

RAPID in RAR: the preamble index received by the network in response;

The RAR payload contains TAG, which is used to adjust the uplink timing;

UL grant: uplink resource indication used to schedule Msg3;

Temporary C-RNTI: PDCCH (initial access) used to scramble Msg4;

If the user equipment receives the PDCCH scrambled by the RAR-RNTI, and the RAR contains the preamble index sent by itself, the user equipment considers that it has successfully received the random access response;

As shown in Figure 3b, for non-contention-based random access, after the user equipment successfully receives Msg2, the random access process ends. For contention-based random access, after the user equipment successfully receives Msg2, it needs to continue to transmit Msg3 and receive Msg4.

The user equipment transmits Msg3 on the network scheduling resources, and the Msg3 is mainly used to notify the network of what event triggered the RACH process. For example, if it is an initial access random process, the UE ID and establishment cause will be carried in Msg3; if it is RRC reestablishment, it will carry the connected UE ID and establishment cause;

The network side device sends Msg4 to the user equipment. Msg4 has two functions. One is for contention conflict resolution, and the second is for the network to transmit an RRC configuration message to the user equipment. There are two ways to resolve the contention conflict: one is that if the UE carries a C-RNTI in Msg3, Msg4 uses C-RNTI scrambled PDCCH scheduling. The other is if the UE does not carry C-RNTI in Msg3, such as initial access, Msg4 uses TC-RNTI scrambled PDCCH scheduling. The conflict resolution is that the UE receives the PDSCH of Msg4 by matching the CCCH SDU in the PDSCH .

From the above random access process, it can be seen that the main purpose of random access is to synchronize the uplink between the user equipment and the cell. In the random access process, the network can know the time when the user equipment sends the preamble according to the RACH time-frequency resource used to receive the preamble from the user equipment, so as to determine the initial TA of the user equipment according to the sending time and receiving time of the preamble, and Inform the user equipment through RAR.

RACH configuration in NR: The RACH configuration is notified to the UE by the network in the form of broadcast. The RACH configuration includes the RACH time-frequency resource configuration and the initial premble root sequence configuration. Among them, the RACH time domain resource configuration is indicated by a RACH configuration index. The RACH resource repetition period can be obtained through the RACH configuration index, and the number of random access channel opportunities (RACH Occasion, referred to as RO) included in a RACH resource repetition period , The duration of each RO, etc.; RACH frequency domain resource configuration includes 1 RACH starting frequency domain resource index and the number of RACH resources that can be frequency division multiplexed at the same time (ie the number of continuous RACH frequency domain resources), Through the RACH frequency domain resource configuration, it can be determined that the RACH frequency domain resource is a continuous frequency domain resource; each cell broadcasts an initial preamble root sequence. Based on the configured initial preamble root sequence, the cell can be obtained by cyclic shift Available praemble collection.

In the related technology, in view of the large coverage area of satellites in the NTN system, the wireless signal transmission delays between user equipment and satellites located in different ground locations in a cell coverage area are quite different, in order to make them in different locations within the cell range. The msg1 sent by the user equipment in the random access process can be received by the network side, and the RACH receiving window length of the network side needs to be extended. However, this will adversely affect the implementation of the network side and the RACH capacity.

To solve the foregoing problem, in the embodiment of the present application, a cell with a larger coverage area is divided into at least two coverage areas, and RACH resources are respectively configured for the at least two divided coverage areas. UEs located in different coverage areas use RACH resources corresponding to the coverage areas in which they are located in the random access process. Using this method can effectively control the length of the RACH receiving window on the network side, thereby avoiding the difficulty of the network side caused by the excessively long RACH receiving window length requirement, and alleviating the impact of the expansion of the RACH receiving window length on the RACH capacity. To achieve the foregoing objectives, the embodiments of the present application provide corresponding solutions, which are described in detail below.

Fig. 4 is a schematic structural diagram of a communication system according to an embodiment of the present application; as shown in Fig. 4, the communication system includes: a network-side device 40 and a user equipment 42, wherein: the network-side device 40 is configured to divide a cell into At least two coverage areas; respectively configure random access channel resources and/or preamble groups for at least two coverage areas; and send the random access channel resources and/or preamble groups to users in at least two coverage areas Equipment; user equipment 42, configured to determine the coverage area where the user equipment is located, and perform random access based on random access channel resources and/or preamble groups corresponding to the coverage area. Among them, the network side device 40 includes but is not limited to: base station and other devices.

In the operating environment shown in FIG. 4, the embodiment of the present application provides a method embodiment of a random access method. It should be noted that the steps shown in the flowchart of the figure can be implemented in a group of computers, such as The instructions are executed in a computer system that executes the instructions, and, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here.

Fig. 5 is a schematic flowchart of a random access method according to an embodiment of the present application. As shown in Fig. 5, the method includes steps S502-S506:

Step S502: The network side device sends the random access channel resource configuration and/or preamble group configuration information to the user equipment;

Step S504: The user equipment determines the coverage area where the user equipment is located, where the coverage area is any one of at least two coverage areas in the cell where the user equipment is located;

In some embodiments of the present application, the user equipment may determine its coverage area in the following ways: the user equipment measures the reference signal received power of the user equipment; the user equipment determines the reference signal received power range to which the reference signal received power belongs; the user The device determines the coverage area corresponding to the reference signal received power range, and uses the determined coverage area as the coverage area where the user equipment is located.

Step S506, the user equipment obtains the random access channel resource and/or preamble group corresponding to the coverage area;

Among them, there are many ways for the user equipment to obtain the random access channel resources. For example, it may be determined through pre-negotiation with the network-side equipment and stored in the local memory of the user equipment; for another example, it may be that the network-side equipment is in the network The side divides the cell where the user equipment is located into multiple coverage areas, and allocates corresponding random access channel resources and/or preamble groups for each coverage area.

Step S508, the user equipment uses random access channel resources and/or preamble groups to perform random access.

It should be noted that in some access scenarios of the user equipment, step S502 is an optional step, that is, when performing random access, if the foregoing resources have been obtained before, step S502 does not need to be executed.

Using the solution in steps S502-S508, since the cell with a relatively large coverage area is divided into multiple coverage areas with a relatively small coverage area, and corresponding resources are allocated to each coverage area, the network side can be effectively controlled. The RACH reception window is long, so as to avoid the difficulties caused by the excessively long RACH reception window length requirement on the network side, and at the same time alleviate the impact of the expansion of the RACH reception window length on the RACH capacity, thereby solving the problem of the larger coverage area in the related technology. It is necessary to support a relatively long RACH receiving window length, which results in high implementation complexity on the network side and technical problems of reducing the RACH capacity.

Wherein, each of the above-mentioned at least two coverage areas may meet the following conditions: the maximum delay difference of signal transmission between the ground position and the satellite in each of the at least two coverage areas is not greater than 2 times the network The length of the receiving window of the random access channel on the side.

In some embodiments of the present application, based on the different resources configured on the network side for each coverage area, the performance process of the random access of the user equipment is also different.

For example: the user equipment determines the first random access channel resource configuration corresponding to the coverage area where the user equipment is located, where the type of the first random access channel resource configuration includes one of the following: random access channel frequency domain resource configuration , Random access channel time-frequency resource configuration; based on the first random access channel resource configuration, the user equipment selects the first random access channel resource for random access, where the first random access channel resource includes one of the following : Random access channel frequency domain resources, random access channel time-frequency resources.

For another example, the user equipment determines a second random access channel resource configuration corresponding to the coverage area in which the user equipment is located, where the type of the second random access channel resource configuration includes one of the following: random access channel frequency domain resources Configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, and the user equipment selects a designated preamble from the preamble group corresponding to the coverage area in which the user equipment is located, and the designated preamble is used for Sent to the network side device; based on the second random access channel resource configuration and the designated preamble, the user equipment selects the second random access channel resource for random access, where the second random access channel resource includes one of the following: Random access channel frequency domain resources, random access channel time domain resources, random access channel time-frequency resources

The above-mentioned access scheme will be described in detail below in conjunction with several different random access procedures. E.g:

The first random access method: the user equipment determines a preamble group corresponding to the coverage area where the user equipment is located; and selects a preamble from the determined preamble group and sends it to the network side device for random access. specifically,

The network side device is configured with one RACH time-frequency resource configuration and at least two preamble groups, and the at least two preamble groups are respectively used for random access by user equipment in different coverage areas in the cell. In the random access process, the user equipment learns the coverage area where it is located based on the RSRP measurement, and uses the preamble in the preamble group corresponding to the coverage area. Based on this principle, the specific implementation process of the first random access method is as follows:

Step 1. The UE receives network configuration information and configures RACH related parameters. specifically:

The configuration information is the common configuration information of the cell, which can be carried in system messages, for example, using SIBx (x is greater than or equal to 1);

Configure 1 RACH time domain resource configuration (including but not limited to RACH time domain resource set): Indicate the distribution of RACH resources in the time domain, thereby determining the time domain resource location where each RO is located. The time interval between any adjacent ROs under the RACH time domain resource configuration is not less than the length of the RACH receiving window on the network side;

Configure 1 RACH frequency domain resource configuration (including but not limited to RACH frequency domain resource set): indicates a continuous segment of RACH frequency domain resource.

Configure N (N>1) preamble groups: there is no intersection between the N preamble groups. The specific implementation can be achieved by one of the following methods: Method 1: Configure N initial preamble root sequences, and the N preamble groups are respectively obtained from the configured N initial preamble root sequences through cyclic shift; Method 2 : Configure 1 initial preamble root sequence, and divide the available preamble set obtained by cyclic shift from the configured 1 initial preamble root sequence into N groups;

Configure N-1 RSRP threshold RSRP_th_i (0<i<=N-1), based on the configured N-1 RSRP threshold, the cell can be divided into N coverage areas, for example: RSRP>=RSRP_th_1 area is coverage area 1 The area where RSRP_th_i<=RSRP<RSRP_th_i-1 is the coverage area i, where 1<i<=N-1; the area where RSRP<RSRP_th_N-1 is the coverage area N.

Two times the maximum delay difference of signal transmission between the ground position and the satellite in each of the N coverage areas shall not exceed the RACH reception window on the network side.

The one-to-one correspondence between N coverage areas and N preamble groups is indicated by explicit signaling or determined in a predefined manner.

The value of N can be determined by one of the following methods: Method 1: The value of N is based on the maximum delay difference max_delta_delay between the signal transmission between each ground position in the cell coverage area and the satellite and the RACH receiving window length on the network side RACH_window_length Determine, for example: N=ceil(max_delta_delay/RACH_window_length); Method 2: N is a predefined value, at this time, the length of the RACH receiving window on the network side should not be less than max_delta_delay/N.

Step 2: Based on the RSRP measurement, the UE compares the measured RSRP with the RSRP threshold configured by the network side device to determine its coverage area.

Step 3. In the random access process, the UE selects the RACH time-frequency resource based on the network configuration, and selects a preamble from the preamble group corresponding to the coverage area and sends it to the network according to the coverage area it is located in determined in step 2.

Step 4. For the same time domain RO, the network side device activates N RACH reception windows for N coverage areas respectively, and the activation time of each RACH reception window in the N RACH reception windows is based on the perigee in the corresponding coverage area. The delay of signal transmission with the network is determined.

Step 5: The network side device receives the preamble from the UE. The network side device can determine the coverage area of the UE based on the received preamble, thereby knowing the RACH time domain resource used when sending msg1, and according to the time when the UE sends msg1 and the network The time of receiving msg1 determines the initial TA of the UE, and informs the UE of the initial TA through RAR.

The specific implementation of the first random access process will be described in detail below in conjunction with FIG. 6 and FIG. 7, where:

The UE receives the RACH resource configuration broadcast by the network and configures the RACH time-frequency resource. As shown in FIG. 7, the time interval of the RACH resource configuration in any adjacent RO in the time domain is not less than the length of the RACH receiving window on the network side.

As shown in Figure 6, the network-side device is configured with two RSRP thresholds, RSRP_th1 and RSRP_th2. The two RSRP thresholds divide the cell into three coverage areas, where:

The area corresponding to RSRP>=RSRP_th1 is coverage area 1;

The area corresponding to RSRP_th2<=RSRP<RSRP_th1 is coverage area 2;

The area corresponding to RSRP<RSRP_th2 is coverage area 3.

As shown in Figure 6, the network side device is configured with 3 preamble groups, among which, preamble group 1 is used for UEs in coverage area 1, preamble group 2 is used for UEs in coverage area 2, and preamble group 3 is used for UEs in coverage area 3.的UE.

In the random access process, the UE determines its coverage area based on RSRP measurement, and selects a preamble from the preamble group corresponding to the coverage area to send to the network.

The network side device can determine whether the UE is in coverage area 1, coverage area 2 or coverage area 3 according to the received preamble, thereby knowing the RACH time domain resource used when sending msg1, and determining it according to the time when the UE sends msg1 and the time when the network receives msg1 The initial TA of the UE informs the UE of the initial TA through RAR.

The second random access method: the user equipment determines the random access channel frequency domain resource configuration corresponding to the coverage area where the user equipment is located, and selects the random access channel frequency based on the determined random access channel frequency domain resource configuration Random access to domain resources. Based on this principle, the specific implementation process of the second random access method is as follows:

The network side device configures one RACH time domain resource configuration and at least two RACH frequency domain resource configurations, and the at least two RACH frequency domain resource configurations are respectively used for random access by user equipment in different coverage areas in the cell. In the random access process, the user equipment learns the coverage area in which it is located based on RSRP measurement, and uses the RACH frequency domain resources in the RACH frequency domain resource configuration corresponding to the coverage area.

The specific implementation process is as follows:

The configuration information is a common configuration of the cell and is carried in a system message, for example, using SIBx (x is greater than or equal to 1).

Configure 1 RACH time domain resource configuration: Indicate the distribution of RACH resources in the time domain, so that the time domain resource location where each RO is located can be determined. The time interval of any adjacent RO under the RACH time domain resource configuration is not less than the length of the RACH receiving window on the network side.

Configure N (N>1) RACH frequency domain resource configurations: each RACH frequency domain resource configuration in the N RACH frequency domain resource configurations indicates a continuous segment of RACH frequency domain resources. The N RACH frequency domain resource segments corresponding to the configured N RACH frequency domain resource configurations do not overlap each other in the frequency domain.

One initial preamble root sequence is configured, and the available preamble set is obtained through cyclic shift from the configured one initial preamble root sequence.

N-1 RSRP thresholds RSRP_th_i (0<i<=N-1) are configured, and the cell can be divided into N coverage areas based on the configured N-1 RSRP thresholds. In the same random access mode as the first random access method, 2 times the maximum signal transmission delay difference between the ground position in each of the N coverage areas and the satellite must not exceed the RACH receiving window on the network side.

The one-to-one correspondence between N coverage areas and N RACH frequency domain resource configurations is indicated by explicit signaling or determined in a predefined manner.

The value of N is the same as the method for determining N in the first random access method, and will not be repeated here.

Step 2: Based on the RSRP measurement, the UE compares the measured RSRP with the RSRP threshold configured by the network to determine the coverage area it is in.

Step 3. In the random access process, the UE selects RACH time-frequency resources based on the network configuration, and selects RACH frequency-domain resources from the RACH frequency-domain resources corresponding to the coverage area according to the coverage area it is in determined in step 2. The UE sends msg1 to the network on the selected RACH time-frequency resource.

Step 4. For the same time domain RO, the network side respectively activates N RACH receiving windows for N coverage areas, and the activation time of each RACH receiving window in the N RACH receiving windows is based on the perigee and the perigee in the corresponding coverage area. The delay of signal transmission between networks is determined.

Step 5: The network side device receives the preamble from the UE. The network can determine the coverage area of the UE based on the RACH frequency domain resource location of the received preamble, thereby knowing the RACH time domain resource used when sending msg1, and according to the UE sending msg1 The time and the time when the network receives msg1 determine the initial TA of the UE, and notify the UE of the initial TA through RAR.

The specific implementation of the second random access method is described in detail below in conjunction with the application scenarios shown in FIG. 8 and FIG. 9, where:

Step 1. The UE receives the RACH configuration information broadcast by the network and configures RACH resources, which specifically includes:

Configure one RACH time domain resource configuration, and the time interval between any adjacent ROs in the time domain under the one RACH time domain resource configuration is not less than the length of the RACH receiving window on the network side;

As shown in FIG. 9, three RACH frequency domain resource configurations are configured, and the three consecutive RACH frequency domain resources corresponding to the three RACH frequency domain resource configurations do not overlap each other in the frequency domain;

Configure the available set of preamble.

Step 2: The network side device configures two RSRP thresholds, RSRP_th1 and RSRP_th2 respectively. The two RSRP thresholds divide the cell into three coverage areas, as shown in Figure 8:

The area where RSRP>=RSRP_th1 is coverage area 1;

The area where RSRP_th2<=RSRP<RSRP_th1 is coverage area 2;

The area where RSRP<RSRP_th2 is coverage area 3.

Step 3. Configure the mapping relationship between three RACH frequency domain resource configurations and cell coverage: RACH frequency domain resource configuration 1 is used for UEs in coverage area 1, and RACH frequency domain resource configuration 2 is used for UEs in coverage area 2. , RACH frequency domain resource configuration 3 is used for UEs in coverage area 3.

Step 4. In the random access process, the UE determines the coverage area in which it is located based on RSRP measurement, and selects a RACH frequency domain resource from the RACH frequency domain resources corresponding to the coverage area.

Step 5. The network side equipment can determine whether the UE is in coverage area 1, coverage area 2 or coverage area 3 according to the RACH frequency domain resources used by the received preamble, so as to know the RACH time domain resources used when sending msg1, and send according to the UE The time of msg1 and the time when the network receives msg1 determine the initial TA of the UE, and notify the UE of the initial TA through RAR.

The third random access method: the user equipment determines the time-domain resource configuration of the random access channel corresponding to the coverage area where the user equipment is located, and selects a preamble from the preamble group corresponding to the coverage area where the user equipment is located Send to the network side device; the user equipment performs random access based on the selected preamble and the random access channel time domain resource selected from the determined random access channel time domain resource configuration. specifically:

The network side device configures one RACH frequency domain resource configuration, and the network configures one RACH time domain resource and one preamble group for each coverage area according to the division of the coverage area in the cell. In the random access process, the user equipment learns the coverage area it is in based on RSRP measurement, uses the RACH time-frequency resource corresponding to the coverage area, and uses the preamble in the preamble group corresponding to the coverage area at the same time. Based on this principle, the specific implementation process of the third random access method is as follows:

Configure N (N>1) RACH time domain resource configurations: the time interval of any adjacent RO under each RACH time domain resource configuration in the N RACH time domain resource configurations is not less than the RACH receiving window on the network side length.

Configure 1 RACH frequency domain resource configuration: Indicate a continuous RACH frequency domain resource.

Configure N (N>1) preamble groups: there is no intersection between the N preamble groups. The specific implementation method is the same as the corresponding content in the first random access method, and will not be repeated here.

Configure N-1 RSRP threshold RSRP_th_i (0<i<=N-1), based on the configured N-1 RSRP threshold, the cell can be divided into N coverage areas, the method is the same as in the first random access method The corresponding implementation method. Two times the maximum delay difference of signal transmission between the ground position and the satellite in each of the N coverage areas shall not exceed the RACH reception window on the network side.

The one-to-one correspondence between N coverage areas, N RACH time domain resource configurations, and N preamble groups is indicated by explicit signaling or determined in a predefined manner.

The value of N is the same as the implementation in the first random access method, and will not be repeated here.

Step 3. In the random access process, the UE determines the coverage area in which it is located in step 2, RACH resource from the RACH time-frequency resource corresponding to the coverage area, and selects a preamble from the preamble group corresponding to the coverage area Send to the network.

Step 4. For each time domain RO under each RACH time domain resource configuration, the network side device starts one RACH receiving window, and the starting time of the RACH receiving window is based on the signal transmission between the perigee in the corresponding coverage area and the network The delay is determined. If there are some ROs under the RACH time domain resource configuration corresponding to multiple coverage areas that overlap in the time domain, for each time domain RO that corresponds to multiple coverage areas at the same time, the network side targets the multiple coverage areas. Each coverage area starts one RACH receiving window.

The specific implementation of the third random access procedure will be described in detail below in conjunction with FIG. 10 and FIG. 11, where:

Step 1. The network side device configures two RSRP thresholds, RSRP_th1 and RSRP_th2 respectively. The two RSRP thresholds divide the cell into three coverage areas, as shown in Figure 10:

The area where RSRP>=RSRP_th1 is coverage area 1;

The area where RSRP_th2<=RSRP<RSRP_th1 is coverage area 2;

The area where RSRP<RSRP_th2 is coverage area 3.

Step 2. The network side device configures RACH configuration information, including:

1 RACH frequency domain resource configuration;

As shown in FIG. 11, in some embodiments of the present application, the network side allocates three RACH time domain resource configurations to the UE. Each of the three RACH time domain resource configurations is in the time domain. The time interval between any adjacent ROs is not less than the length of the RACH receiving window on the network side. Among them, RACH time domain resource configuration 1 is used for UEs in coverage area 1, RACH time domain resource configuration 2 is used for UEs in coverage area 2, and RACH time domain resource configuration 3 is used for UEs in coverage area 3.

Step 3: The network side device configures three preamble groups, where preamble group 1 is used for UEs in coverage area 1, preamble group 2 is used for UEs in coverage area 2, and preamble group 3 is used for UEs in coverage area 3.

Step 4. In the random access process, the UE determines its coverage area based on RSRP measurement. The UE selects the RACH resource from the RACH time-frequency resources corresponding to the coverage area, and selects a preamble from the preamble group corresponding to the coverage area to send to the network.

Step 5. The network side device can determine whether the UE is in coverage area 1, coverage area 2 or coverage area 3 according to the received preamble, thereby knowing the RACH time domain resource used when sending msg1, and according to the time when the UE sends msg1 and the network receives msg1 The initial TA of the UE is determined at the time, and the initial TA is notified to the UE through RAR.

The third random access method: the user equipment determines the random access channel time-frequency resource configuration corresponding to the coverage area where the user equipment is located; the user equipment is based on the random access selected from the determined random access channel time-frequency resource configuration Channel time-frequency resources for random access. specifically,

The network side device configures at least two RACH time-frequency resource configurations, and the at least two RACH time-frequency resource configurations are respectively used for random access by user equipment in different coverage areas in the cell. In the random access process, the user equipment learns the coverage area it is in based on the RSRP measurement, and uses the RACH resource in the RACH time-frequency resource configuration corresponding to the coverage area. Based on this principle, the specific implementation process of the fourth random access method is as follows:

Configure N-1 RSRP threshold RSRP_th_i (0<i<=N-1), and the cell can be divided into N coverage areas based on the configured N-1 RSRP threshold. In the same random access mode as the first random access method, 2 times the maximum signal transmission delay difference between the ground position in each of the N coverage areas and the satellite must not exceed the RACH receiving window on the network side.

The one-to-one correspondence between N coverage areas and N sets of RACH time-frequency resource configurations is indicated by explicit signaling or determined in a predefined manner.

The method for determining the value of N is the same as the method for determining the value of N in the first random access method, and will not be repeated here.

Step 3. In the random access process, the UE selects the RACH resource from the RACH time-frequency resources corresponding to the coverage area according to the coverage area it is in determined in step 2, and the UE sends msg1 to the selected RACH time-frequency resource. The internet.

Step 4. For each time domain RO under each RACH time domain resource configuration, the network side device starts one RACH receiving window, and the starting time of the RACH receiving window is based on the signal transmission between the perigee in the corresponding coverage area and the network The delay is determined. If some ROs under the RACH time domain resource configuration corresponding to multiple coverage areas overlap in the time domain, for each RO that corresponds to multiple coverage areas at the same time, the network side targets each of the multiple coverage areas. The coverage area starts 1 RACH receiving window respectively.

Step 5: The network side device receives the preamble from the UE. The network side device can determine the coverage area of the UE according to the RACH frequency domain resource location of the received preamble, thereby knowing the RACH time domain resource used when sending msg1, and send it according to the UE The time of msg1 and the time when the network receives msg1 determine the initial TA of the UE, and notify the UE of the initial TA through RAR.

The specific implementation of the fourth random access process will be described in detail below in conjunction with FIG. 12 and FIG. 13, where:

Step 1. The network side device configures two RSRP thresholds, RSRP_th1 and RSRP_th2 respectively. The two RSRP thresholds divide the cell into three coverage areas, as shown in Figure 12:

The area where RSRP>=RSRP_th1 is coverage area 1;

The area where RSRP_th2<=RSRP<RSRP_th1 is coverage area 2;

The area where RSRP<RSRP_th2 is coverage area 3.

Step 2. The network side device configures RACH configuration information. This step includes the following processing procedures:

The three RACH frequency domain resource configurations, as shown in FIG. 13, the three consecutive RACH frequency domain resources corresponding to the three RACH frequency domain resource configurations do not overlap each other in the frequency domain. Among them, RACH frequency domain resource configuration 1 is used for UEs in coverage area 1, RACH frequency domain resource configuration 2 is used for UEs in coverage area 2, and RACH frequency domain resource configuration 3 is used for UEs in coverage area 3.

Three RACH time domain resource configurations, and the time interval of any adjacent RO in the time domain under each RACH time domain resource configuration in the three RACH time domain resource configurations is not less than the length of the RACH receiving window on the network side. Among them, RACH time domain resource configuration 1 is used for UEs in coverage area 1, RACH time domain resource configuration 2 is used for UEs in coverage area 2, and RACH time domain resource configuration 3 is used for UEs in coverage area 3.

The network side device is configured with an available set of available preambles.

Step 3. In the random access process, the UE determines its coverage area based on RSRP measurement. The UE selects the RACH resource from the RACH time-frequency resources corresponding to the coverage area, and selects a preamble from the set of available preambles to send to the network.

Step 4. The network side device can determine whether the UE is in coverage area 1, coverage area 2 or coverage area 3 according to the RACH frequency domain resource where the received preamble is located, so as to know the RACH time domain resource used when sending msg1, and send msg1 according to the UE The time at and the time at which the network receives msg1 determine the initial TA of the UE, and notify the UE of the initial TA through RAR.

It should be noted that the cell in the embodiment of the present application includes, but is not limited to: any cell covered by NTN.

The embodiment of the present application also provides a resource configuration method, which mainly describes the resource configuration process from the perspective of the network side. Specifically, as shown in FIG. 14, the method includes:

Step S140: The network side device divides the cell into at least two coverage areas;

For example, the network-side device divides the cell into at least two coverage areas based on at least one reference signal received power threshold, where different coverage areas correspond to different reference signal received power ranges, and the reference signal received power ranges are based on at least one reference signal received power range. The signal received power threshold is determined.

Wherein, 2 times the maximum delay difference of signal transmission between the ground position in each of the at least two coverage areas and the satellite is not greater than the receiving window length of the random access channel on the network side.

Step S142: The network side device configures random access channel resources and/or preamble groups for at least two coverage areas respectively;

There are many ways for the network-side device to allocate resources. For example, the network-side device configures at least two preamble groups for at least two coverage areas, where at least two preamble groups and at least two coverage areas are in one-to-one correspondence. There is no intersection between at least two preamble groups. That is, the network side device configures a preamble group for each of the at least two coverage areas, so that the UE can use the corresponding preamble for random access.

For another example, the network side device configures at least two first random access channel resource configurations for at least two coverage areas, where the type of the first random access channel resource configuration includes one of the following: random access channel frequency domain resources Configuration, random access channel time-frequency resource configuration, random access channel frequency domain resource configuration; frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and different random access channel time-frequency resources The frequency domain resources in the resource configuration do not overlap in the frequency domain. specifically:

The network side device configures at least two random access channel frequency domain resource configurations for at least two coverage areas, where the at least two random access channel frequency domain resource configurations correspond to at least two coverage areas in a one-to-one relationship, and at least two The frequency domain resources in each random access channel frequency domain resource configuration in the random access channel frequency domain resource configuration do not overlap in the frequency domain. Wherein, the random access channel frequency domain resource configuration includes, but is not limited to, a random access channel frequency domain resource set. or,

The network side device configures a random access channel time domain resource configuration and a preamble group for each of the at least two coverage areas, where there is no intersection between the preamble groups corresponding to different coverage areas. The random access channel time domain resource configuration includes but is not limited to: a random access channel time domain resource set. or,

The network-side device configures at least two random access channel time-frequency resource configurations for at least two coverage areas, and at least two random access channel time-frequency resource configurations correspond to at least two coverage areas in a one-to-one relationship. The frequency domain resources in the frequency domain resource configuration of each random access channel in the incoming channel time-frequency resource configuration do not overlap.

Step S144: The network side device sends the random access channel resource and/or preamble group to the user equipment in the cell.

In some embodiments of the present application, the number of at least two coverage areas and at least two preamble groups is N, where N is a natural number greater than or equal to 2; at least two preamble groups use one of the following methods Confirm: Configure N initial preamble root sequences, cyclically shift the N initial preamble root sequences to obtain N preamble groups; configure an initial preamble root sequence, which will start from one The available preamble set obtained by the cyclic shift of the preamble root sequence is divided into N groups, and N preamble groups are obtained.

In addition, the network-side device may also activate at least two random access channel receiving windows for at least two coverage areas, respectively. The activation time of each random access channel receiving window in the at least two random access channel receiving windows is based on the corresponding coverage area. The signal transmission delay between the perigee in the area and the network side equipment is determined.

In some embodiments of the present application, the correspondence between at least two coverage areas and random access channel resources may be indicated by explicit signaling or determined in a predefined manner.

The number of at least two coverage areas can be determined in the following way: for example, the number is set to N; the value of N is determined in one of the following ways: according to the maximum signal transmission between each ground position in the cell coverage area and the satellite The delay difference and the receiving window length of the random access channel on the network side are determined; a predefined way.

As mentioned above, when the network-side device allocates resources to the cell, the cell it targets includes but is not limited to: any cell covered by NTN.

It can be seen that because the network-side equipment divides the cell with a relatively large coverage area into multiple coverage areas with a relatively small coverage area, and allocates corresponding resources for each coverage area, it can effectively control the network-side RACH reception The length of the window, so as to avoid the difficulties caused by the excessively long RACH reception window length on the network side, and at the same time alleviate the impact of the expansion of the RACH reception window length on the RACH capacity, thereby solving the need for support in the related technology due to the larger coverage area of the cell The relatively long RACH receiving window length results in high implementation complexity on the network side and reduces the technical problem of RACH capacity.

The embodiment of the present application also provides another resource configuration method. As shown in FIG. 15, the method includes:

Step S150: The network side device divides the cell into multiple coverage areas;

Step S152: The network side device allocates channel resources for multiple coverage areas;

Step S154: The network side device sends channel resources to user equipments in multiple coverage areas.

Among them, there may be two types of resources in the channel resources allocated for each coverage area. For example, they may include shared resources and non-shared resources. For the allocation of non-shared resources, please refer to the relevant information in the embodiment shown in Figure 4-14. Description, I won’t repeat it here.

In some embodiments of the present application, the network-side device allocating channel resources for multiple coverage areas may be represented as the following processing process: the network-side device respectively configures random access channel resources and/or preamble groups for multiple coverage areas.

specifically:

1) The network side device configures a preamble group for each of the multiple coverage areas, and there is no intersection between the preamble groups corresponding to different coverage areas.

2) The network side device configures the first random access channel resource configuration for each of the multiple coverage area configurations, where the type of the first random access channel resource configuration includes one of the following: random access channel frequency Domain resource configuration, random access channel time-frequency resource configuration, random access channel frequency domain resource configuration; frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and different random access channels The frequency domain resources in the time-frequency resource configuration do not overlap in the frequency domain.

3) The network side device configures a second random access channel resource configuration for each of the multiple coverage areas, where the type of the second random access channel resource configuration includes one of the following: random access channel frequency Domain resource configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and different random access channels The frequency domain resources in the time-frequency resource configuration do not overlap in the frequency domain.

It should be noted that, for the preferred implementation manner of the embodiment shown in FIG. 15, reference may be made to the related description of the embodiment shown in FIGS. 4-14, which will not be repeated here.

An embodiment of the present application also provides a network-side device. As shown in FIG. 16, the network-side device 16 includes a signal transceiving circuit 160 and a processor 162. In some embodiments of the present application, it may also include a memory 164; The processor is configured to execute program instructions stored in the memory, for example, divide the cell into at least two coverage areas; configure random access channel resources and/or preamble groups for the at least two coverage areas; signal transceiver circuit , Set to send the random access channel resource and/or preamble group to user equipment in at least two coverage areas, and the signal transceiving circuit 160 is set to communicate with other devices.

For example, the processor may be configured to read the information in the memory 164 and perform the following processing procedure: divide the cell into at least two coverage areas based on at least one reference signal received power threshold, where different coverage areas correspond to different coverage areas. The reference signal received power range, the reference signal received power range is determined based on at least one reference signal received power threshold.

For another example, the processor is further configured to configure at least two preamble groups for at least two coverage areas, wherein the at least two preamble groups and the at least two coverage areas are in one-to-one correspondence, and one of the at least two preamble groups is There is no intersection between them.

For another example, the processor is further configured to configure at least two random access channel frequency domain resource configurations for at least two coverage areas, where the at least two random access channel frequency domain resource configurations and the at least two coverage areas are one-to-one. Correspondingly, the frequency domain resources in each random access channel frequency domain resource configuration in the at least two random access channel frequency domain resource configurations do not overlap in the frequency domain.

For another example, the processor is further configured to configure a random access channel time domain resource configuration and a preamble group for each of the at least two coverage areas, where the preamble groups corresponding to different coverage areas No intersection.

For another example, the processor is further configured to configure at least two random access channel time-frequency resource configurations for at least two coverage areas, and the at least two random access channel time-frequency resource configurations are in one-to-one correspondence with the at least two coverage areas , The time domain resources in each random access channel time domain resource configuration in the at least two random access channel time domain resource configurations do not overlap in the time domain.

The embodiment of the present application also provides a user equipment. As shown in FIG. 17, the user equipment 17 includes: a signal transceiving circuit 170 and a processor 172, and may also include hardware modules such as a memory 174; wherein the signal transceiving circuit 170 is configured to To receive the random access channel resource and/or preamble group corresponding to the coverage area in which the user equipment is located; the processor 172 is configured to determine the coverage area in which the user equipment is located, and use the random access channel resource and/or preamble group to perform Random access, where the coverage area is any one of at least two coverage areas in the cell where the user equipment is located.

The above-mentioned processor may be an integrated circuit chip with data processing capability. In the implementation process, some steps of the above method can be completed by hardware integrated logic circuits or software instructions in the processor 172, which can be general-purpose processors, digital signal processors, application-specific integrated circuits, programmable logic devices, etc. . The processor 172 can read information in the memory 170 to implement corresponding functions.

For example, the processor is further configured to measure the reference signal received power of the user equipment; determine the reference signal received power range to which the reference signal received power belongs; and determine the coverage area corresponding to the reference signal received power range, and use the determined coverage area as The coverage area where the user equipment is located.

For example, the processor is further configured to determine a preamble group corresponding to the coverage area where the user equipment is located; and select a preamble from the determined preamble group and send it to the network side device for random access.

For example, the processor is further configured to determine a random access channel frequency domain resource corresponding to the coverage area where the user equipment is located, and perform random access based on the determined random access channel frequency domain resource.

For example, the processor is further configured to determine a random access channel time domain resource corresponding to the coverage area where the user equipment is located; select a preamble from the preamble group corresponding to the coverage area where the user equipment is located and send it to the network side Equipment; and random access based on the determined random access channel time domain resources and the selected preamble.

For example, the processor is further configured to determine a random access channel time-frequency resource corresponding to the coverage area where the user equipment is located; and perform random access based on the determined random access channel time-frequency resource.

Wherein, the cell in this embodiment includes but is not limited to: any cell not covered by the terrestrial communication network.

The embodiment of the present application also provides a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the above random access method or Resource allocation method.

An embodiment of the present application also provides a processor, which is configured to run a program stored in a memory, where the above random access method or resource configuration method is executed when the program is running.

The serial numbers of the foregoing embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus. For a part that is not described in detail in an embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units may be a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, units or modules, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes. .

The above are only the preferred embodiments of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can be made, and these improvements and modifications are also Should be regarded as the scope of protection of this application.

Industrial applicability

The solutions provided in the embodiments of this application can be applied to the random access process. Based on the solutions provided in the embodiments of this application, since a cell with a relatively large coverage area is divided into multiple coverage areas with a relatively small coverage area, each Corresponding resources are allocated to each coverage area. Therefore, the network-side RACH reception window length can be effectively controlled, so as to avoid the difficulties caused by the excessively long RACH reception window length on the network side, and at the same time alleviate the RACH reception window length expansion to the RACH The impact of capacity, in turn, solves the technical problems in related technologies that cells with a larger coverage area need to support a relatively long RACH receiving window length, which results in high implementation complexity on the network side and reduced RACH capacity.

Claims

A random access method, including:

The user equipment determines the coverage area where the user equipment is located, where the coverage area is any one of at least two coverage areas in the cell where the user equipment is located;

Acquiring, by the user equipment, random access channel resources and/or preamble groups corresponding to the coverage area;

The user equipment uses the random access channel resource and/or preamble group to perform random access.
The method according to claim 1, wherein the user equipment determining the coverage area in which the user equipment is located comprises:

Measuring the reference signal received power of the user equipment by the user equipment;

Determining, by the user equipment, a reference signal received power range to which the reference signal received power belongs;

The user equipment determines a coverage area corresponding to the reference signal received power range, and uses the determined coverage area as the coverage area where the user equipment is located.
The method according to claim 1, wherein the maximum delay difference of signal transmission between the ground position in each of the at least two coverage areas and the satellite is not more than twice the maximum delay difference of signal transmission at the network side The length of the channel receiving window.
The method according to claim 1, wherein the access by the user equipment using the random access channel resource and/or preamble group comprises:

The user equipment determines a preamble group corresponding to the coverage area where the user equipment is located; and selects a preamble from the determined preamble group and sends it to the network side device for random access.
The method according to claim 1, wherein the access by the user equipment using the random access channel resource and/or preamble group comprises:

The user equipment determines a first random access channel resource configuration corresponding to the coverage area in which the user equipment is located, wherein the type of the first random access channel resource configuration includes one of the following: random access channel Frequency domain resource configuration, random access channel time-frequency resource configuration;

Based on the first random access channel resource configuration, the user equipment selects a first random access channel resource for random access, where the first random access channel resource includes one of the following: random access channel frequency Domain resources, random access channel time-frequency resources.
The method according to claim 1, wherein the access by the user equipment using the random access channel resource and/or preamble group comprises:

The user equipment determines a second random access channel resource configuration corresponding to the coverage area in which the user equipment is located, wherein the type of the second random access channel resource configuration includes one of the following: random access channel Frequency domain resource configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, and,

The user equipment selects a designated preamble from a preamble group corresponding to the coverage area in which the user equipment is located, and the designated preamble is used to send to the network side device;

Based on the second random access channel resource configuration and the designated preamble, the user equipment selects a second random access channel resource for random access, where the second random access channel resource includes one of the following 1: Random access channel frequency domain resources, random access channel time domain resources, random access channel time-frequency resources.
The method according to any one of claims 1 to 6, wherein the cell comprises: any cell not covered by a terrestrial communication network.
A resource allocation method, including:

The network side device divides the cell into at least two coverage areas;

The network side device configures random access channel resources and/or preamble groups for the at least two coverage areas respectively;

The network side device sends the random access channel resource and/or preamble group to the user equipment of the cell.
The method according to claim 8, wherein the network-side device dividing the cell into at least two coverage areas comprises:

The network-side device divides the cell into the at least two coverage areas based on at least one reference signal received power threshold, where different coverage areas correspond to different reference signal received power ranges, and the reference signal received power The range is determined based on the at least one reference signal received power threshold.
The method according to claim 8, wherein the maximum delay difference of signal transmission between the ground position in each of the at least two coverage areas and the satellite is not more than twice the maximum delay difference of the signal transmission at the network side The length of the channel receiving window.
The method according to claim 8, wherein the network-side device separately configuring random access channel resources and/or preamble groups for the at least two coverage areas comprises:

The network side device configures a preamble group for each of the at least two coverage areas, and there is no intersection between the preamble groups corresponding to different coverage areas.
The method according to claim 11, wherein the number of the at least two coverage areas and the number of the at least two preamble groups are both N, where N is a natural number greater than or equal to 2; the at least two The preamble group is determined by one of the following methods:

Configuring N initial preamble root sequences, and cyclically shifting the N initial preamble root sequences to obtain N preamble groups;

An initial preamble root sequence is configured, and the available preamble set obtained by cyclic shifting from the one initial preamble root sequence is divided into N groups to obtain the N preamble groups.
The method according to claim 8, wherein the network-side device separately configuring random access channel resources and/or preamble groups for the at least two coverage areas comprises:

The network side device configures at least two first random access channel resource configurations for the at least two coverage areas, wherein the type of the first random access channel resource configuration includes one of the following: random access channel Frequency domain resource configuration, random access channel time-frequency resource configuration, random access channel frequency domain resource configuration; frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, and different random access The frequency domain resources in the channel time-frequency resource configuration do not overlap in the frequency domain.
The method according to claim 13, wherein the method further comprises:

The network side device activates at least two random access channel receiving windows for the at least two coverage areas respectively, and the activation time of each random access channel receiving window in the at least two random access channel receiving windows is based on The signal transmission delay between the perigee in the corresponding coverage area and the network side device is determined.
The method according to claim 8, wherein the network-side device separately configuring random access channel resources and/or preamble groups for the at least two coverage areas comprises:

The network side device configures at least two second random access channel resource configurations for the at least two coverage areas, wherein the type of the second random access channel resource configuration includes one of the following: random access channel Frequency domain resource configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain, different random access The frequency domain resources in the channel time-frequency resource configuration do not overlap in the frequency domain.
The method according to any one of claims 8 to 15, wherein the method further comprises: the correspondence between the at least two coverage areas and the random access channel resources is indicated by explicit signaling or in accordance with a predefined The way is ok.
The method according to any one of claims 8 to 15, wherein the number of the at least two coverage areas is N; the value of N is determined by one of the following methods:

Determined according to the maximum time delay difference of signal transmission between each ground position and satellite in the cell coverage area and the random access channel receiving window length on the network side;

Predefined way.
The method according to any one of claims 8 to 15, wherein the cell comprises: any cell not covered by a terrestrial communication network.
A resource allocation method, including:

The network side equipment divides the cell into multiple coverage areas;

The network side device allocates channel resources for the multiple coverage areas;

The network side device sends the channel resource to the user equipment in the multiple coverage areas.
The method according to claim 19, wherein the network-side device allocating channel resources for the multiple coverage areas comprises:

The network side device configures random access channel resources and/or preamble groups for the multiple coverage areas respectively.
The method according to claim 20, wherein the network-side device configuring random access channel resources and/or preamble groups for the multiple coverage areas respectively comprises:

The network side device configures a preamble group for each of the multiple coverage areas, and there is no intersection between the preamble groups corresponding to different coverage areas.
The method according to claim 20, wherein the network-side device configuring random access channel resources and/or preamble groups for the multiple coverage areas respectively comprises:

The network side device configures a first random access channel resource configuration for each of the multiple coverage area configurations, where the type of the first random access channel resource configuration includes one of the following: random Access channel frequency domain resource configuration, random access channel time-frequency resource configuration, random access channel frequency domain resource configuration; frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain and are different The frequency domain resources in the random access channel time-frequency resource configuration do not overlap in the frequency domain.
The method according to claim 20, wherein the network-side device configuring random access channel resources and/or preamble groups for the multiple coverage areas respectively comprises:

The network-side device separately configures a second random access channel resource configuration for each of the multiple coverage areas, where the type of the second random access channel resource configuration includes one of the following: random Access channel frequency domain resource configuration, random access channel time domain resource configuration, random access channel time-frequency resource configuration, frequency domain resources in the frequency domain resource configuration of different random access channels do not overlap in the frequency domain and are different The frequency domain resources in the random access channel time-frequency resource configuration do not overlap in the frequency domain.
A network side device, including: a signal transceiver circuit and a processor; wherein,

The processor is configured to divide a cell into at least two coverage areas; configure random access channel resources and/or preamble groups for the at least two coverage areas;

The signal transceiving circuit is configured to send the random access channel resource and/or preamble group to the user equipment in the at least two coverage areas.
The network side device according to claim 24, wherein the processor is further configured to divide the cell into the at least two coverage areas based on at least one reference signal received power threshold, wherein different coverage areas The regions correspond to different reference signal received power ranges, and the reference signal received power range is determined based on the at least one reference signal received power threshold.
The network side device according to claim 24, wherein the processor is further configured to configure at least two preamble groups for the at least two coverage areas, wherein the at least two preamble groups and the The at least two coverage areas are in one-to-one correspondence, and there is no intersection between the at least two preamble groups.
The network side device according to claim 24, wherein the processor is further configured to configure at least two random access channel frequency domain resource configurations for the at least two coverage areas, wherein the at least two random The access channel frequency domain resource configuration has a one-to-one correspondence with the at least two coverage areas, and the frequency domain resources in each random access channel frequency domain resource configuration in the at least two random access channel frequency domain resource configurations are There is no overlap in the frequency domain.
The network side device according to claim 24, wherein the processor is further configured to configure a random access channel time domain resource configuration and a preamble for each of the at least two coverage areas. Groups, where there is no intersection between preamble groups corresponding to different coverage areas.
The network side device according to claim 24, wherein the processor is further configured to configure at least two random access channel time-frequency resource configurations for the at least two coverage areas, and the at least two random access The channel time-frequency resource configuration has a one-to-one correspondence with the at least two coverage areas, and the frequency domain resources in the frequency domain resource configuration of each random access channel in the at least two random access channel time-frequency resource configurations are in the frequency domain. The above does not overlap.
A user equipment, including: a signal transceiver circuit and a processor; wherein,

The signal transceiving circuit is configured to receive random access channel resources and/or preamble groups corresponding to the coverage area where the user equipment is located;

The processor is configured to determine the coverage area where the user equipment is located, and use the random access channel resource and/or preamble group to perform random access, wherein the coverage area is at least two of the cells where the user equipment is located. Any one of the three coverage areas.
The user equipment according to claim 30, wherein the processor is further configured to measure the reference signal received power of the user equipment; determine the reference signal received power range to which the reference signal received power belongs; and determine the reference signal received power range to which the reference signal received power belongs; The coverage area corresponding to the reference signal received power range, and the determined coverage area is taken as the coverage area where the user equipment is located.
The user equipment according to claim 30, wherein the processor is further configured to determine a preamble group corresponding to the coverage area where the user equipment is located; and select a preamble from the determined preamble group to send To the network side device for random access.
The user equipment according to claim 30, wherein the processor is further configured to determine a random access channel frequency domain resource corresponding to the coverage area in which the user equipment is located, and based on the determined random access channel frequency Random access to domain resources.
The user equipment according to claim 30, wherein the processor is further configured to determine a random access channel time domain resource corresponding to the coverage area where the user equipment is located; Select a preamble from the preamble group corresponding to the coverage area and send it to the network side device; and perform random access based on the determined random access channel time domain resource and the selected preamble.
The user equipment according to claim 30, wherein the processor is further configured to determine a random access channel time-frequency resource corresponding to the coverage area in which the user equipment is located; and based on the determined random access channel time-frequency resource Frequency resources for random access.
The user equipment according to any one of claims 30 to 35, wherein the cell comprises: any cell not covered by a terrestrial communication network.
A communication system, including: network side equipment and user equipment, where:

The network side device is configured to divide a cell into at least two coverage areas; configure random access channel resources and/or preamble groups for the at least two coverage areas; and divide the random access channel resources And/or the preamble group is sent to the user equipment in the at least two coverage areas;

The user-side equipment is configured to determine the coverage area where the user equipment is located, and perform random access based on random access channel resources and/or preamble groups corresponding to the coverage area.
A non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein, when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of claims 1 to 7 The random access method described in item, or the resource configuration method described in any one of claims 8 to 18.
A processor configured to run a program stored in a memory, wherein the program executes the random access method according to any one of claims 1 to 7, or executes claims 8 to 18. The resource configuration method described in any one of 18.