WO2021184278A1

WO2021184278A1 - Random access method and system

Info

Publication number: WO2021184278A1
Application number: PCT/CN2020/080123
Authority: WO
Inventors: 李鹏; 徐玺钰
Original assignee: 海能达通信股份有限公司
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2021-09-23

Abstract

The present application provides a random access method and system. A base station stores a channel resource index table. The channel resource index table comprises a channel resource location belonging to ground equipment and a channel resource location belonging to aerial equipment, and the channel resource location belonging to the ground equipment and the channel resource location belonging to the aerial equipment do not overlap. The method comprises: sending a broadcast system message to user equipment in a cell, using a ground equipment detection method to perform detection in a channel resource location belonging to ground equipment, and using an aerial equipment detection method to perform detection in a channel resource location belonging to aerial equipment; if an access signal of the user equipment is detected in the resource location belonging to the ground equipment, identifying that the user equipment as the ground equipment, and connecting same to a communication system; and if an access signal of the user equipment is detected in the resource location belonging to the aerial equipment, identifying that the user equipment as the aerial equipment, and connecting same to the communication system. The present invention achieves access to the aerial equipment and the ground equipment, and identifies the equipment type.

Description

Random access method and system

Technical field

This application relates to the field of communication technology, and in particular to random access methods and systems.

Background technique

Aerial equipment (such as drones) has a wide range of applications in photographing, disaster relief, express delivery, surveying, etc. As the application scenarios become more abundant and related technologies continue to mature, communication technologies related to aerial equipment have flourished.

In order to more effectively control the air equipment and meet the requirements of more application scenarios, it is an important direction of the current 4G communication system evolution to regard the air equipment as the user equipment in the communication system to access the base station.

Summary of the invention

In view of this, the present application provides a random access method and system, which can connect aerial equipment to the current communication system, so that the base station can satisfy both the ground equipment access and the aerial equipment access, and the user equipment Access also identifies the user equipment as ground equipment or aerial equipment.

In order to achieve the above objectives, the present invention provides the following technical features:

A random access method is applied to a base station in a long-term evolution system. The base station stores a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channel resource positions belonging to air equipment, Moreover, the position of the channel resource belonging to the ground equipment and the position of the channel resource belonging to the aerial equipment do not overlap; the method includes:

Send a broadcast system message to the user equipment in the cell for the user equipment to send an access signal;

Use ground equipment detection methods to detect the location of channel resources belonging to ground equipment, and use aerial equipment detection methods to perform detection at the location of channel resources belonging to air equipment;

If the access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system;

If the access signal of the user equipment is detected at the resource location belonging to the air equipment, the user equipment is identified as an air equipment and accesses the communication system.

Optionally, the broadcast system message includes a PRACH configuration index parameter, and a channel frequency domain offset parameter;

Then the method of using ground equipment detection to perform detection at the location of channel resources belonging to ground equipment, and using the detection method of air equipment to perform detection at the location of channel resources belonging to air equipment includes:

From the channel resource index table, determine the current channel resource configuration parameter set corresponding to the PRACH configuration index parameter; wherein, the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channels belonging to air equipment Resource parameters;

Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated;

Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated;

The ground equipment detection method is used to perform detection at the current channel resource position belonging to the ground equipment, and the air equipment detection method is used to perform detection at the current channel resource position belonging to the air equipment.

Optionally, in the frequency division duplex mode between the user equipment and the base station, the channel resource parameters of the ground equipment include the system frame number and the subframe number; wherein, the combined result of the system frame number and the subframe number corresponding to the ground equipment , And, the combined result of the system frame number and subframe number corresponding to the air equipment is different;

Then the calculation based on the channel resource parameter of the ground device and the channel frequency domain offset parameter to obtain the current resource location belonging to the ground device includes:

Taking the channel frequency domain offset parameter as the frequency domain start resource position of the ground equipment, and 6 resource blocks starting from the frequency domain start resource position as the frequency domain resource position of the ground equipment;

Determining the system frame number and subframe number as the time domain resource location of the ground equipment;

The frequency domain resource location and the time domain resource location of the ground equipment are determined as the current resource location of the ground equipment.

Optionally, in the frequency division duplex mode between the user equipment and the base station, the channel resource parameters of the air equipment include the system frame number and the subframe number; wherein, the combined result of the system frame number and the subframe number corresponding to the air equipment , And, the combined result of the system frame number and subframe number corresponding to the ground equipment is different;

Then the calculation based on the channel resource parameter of the air device and the channel frequency domain offset parameter to obtain the current resource location belonging to the air device includes:

Determine the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment;

Determine the frequency domain starting resource position of the ground equipment and the sum of the offset as the frequency domain starting resource position of the air equipment, and the 6 resource blocks starting from the frequency domain starting resource position as the air equipment’s Frequency domain resource location;

Use the system frame number and subframe number as the time domain resource location of the air device;

The frequency domain resource location and the time domain resource location of the air equipment are determined as the current resource location of the air equipment.

Optionally, when the time division duplex mode is adopted between the user equipment and the base station, the channel resource parameter of the ground equipment includes a quadruple

Among them, the ground equipment corresponds to the quadruple, and the air equipment corresponds to the quadruple is different;

According to the frequency domain resource index f _RA and the channel frequency domain offset parameter, the frequency domain starting resource position of the ground equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the ground equipment The frequency domain resource location;

pass through

with

Three parameters determine the time domain resource location of ground equipment; among them

System frame indicating the location of accessible resources,

Indicate the first half frame or the second half frame of the accessible resource location,

Indicates the index of the subframe where the location of the accessible resource is located after the special subframe,

Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames,

Indicate whether the location of the accessible resource is the first half frame or the second half frame;

Optionally, when the time division duplex mode is adopted between the user equipment and the base station, the channel resource parameter of the air equipment includes a quadruple

According to the frequency domain resource index f _RA and the channel frequency domain offset parameter, the frequency domain starting resource position of the air equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the air equipment The frequency domain resource location;

pass through

with

Three parameters determine the time domain resource location of the air equipment; among them

System frame indicating the location of accessible resources,

Optionally, the channel resource index table stored by the base station includes:

When the user equipment and the base station adopt the frequency division duplex mode, both the base station and the user equipment store the FDD channel resource index table; among them, the FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes The channel resource parameters of the ground equipment and the channel resource parameters of the air equipment;

When the user equipment and the base station adopt the time division duplex mode, both the base station and the user equipment store a TDD channel resource index table, and the TDD channel resource index table includes a TDD time domain channel resource index table after dividing time domain resources, or, for TDD frequency domain channel resource index table after frequency domain resource division;

The FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channel resource parameters belonging to air equipment.

A random access method, applied to user equipment, the user equipment stores a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channel resource positions belonging to air equipment, and belongs to The position of the channel resource of the ground equipment and the position of the channel resource of the air equipment do not overlap; the method includes:

Receive broadcast system messages sent by the base station;

Determine the resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment;

Sending an access signal to the resource location.

Optional, include:

In the case that the device type of the user equipment is a ground device, the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location;

In the case where the device type of the user equipment is an air device, the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource corresponding to the broadcast system message and belonging to the air device Location.

A random access system includes a base station and a plurality of user terminals. The base station and the user terminals each store a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channels belonging to air equipment Resource location, and the channel resource location belonging to the ground equipment and the channel resource location belonging to the aerial equipment do not overlap;

The user terminal is configured to receive a broadcast system message sent by a base station, and based on the broadcast system message and the device type of the user equipment, determine the resource location corresponding to the broadcast system message and the device type, and send it to the resource The location sends an access signal;

The base station is used to send broadcast system messages to the user equipment in the cell for the user equipment to send access signals, use the ground equipment detection method to detect the position of the channel resources belonging to the ground equipment, and use the air equipment detection method to perform the detection in the air The channel resource location of the device is detected. If the user equipment's access signal is detected at the resource location of the ground device, the user equipment is identified as a ground device and connected to the communication system. If the user equipment is detected at the resource location of the air device If the access signal is detected, the user equipment is identified as an aerial device and connected to the communication system.

Through the above technical means, the following beneficial effects can be achieved:

This application proposes a random access method. Since the resource location of the air device is added to the channel resource index table, and the channel resource location of the ground device and the channel resource location of the air device do not overlap, so that the user equipment can access the resource to which it belongs. Send an access signal at the location.

The base station may use a detection method suitable for ground equipment to detect the access signal at the resource location belonging to the ground equipment, and if it can be detected, it will access the user equipment and identify the equipment type as ground equipment. In the same way, the base station can use a detection method suitable for aerial equipment to detect the access signal at the resource location belonging to the aerial equipment, and if it can be detected, it will access the user equipment and identify the equipment type as an aerial equipment.

That is, this application can realize random access of ground equipment and aerial equipment in an existing communication system, and can identify the equipment type of user equipment at the same time of access, so that a single cell can support both ground equipment and support The purpose of aerial equipment.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

1a-1c are schematic structural diagrams of a random access system provided by an embodiment of this application;

FIG. 2 is a flowchart of a random access method provided by an embodiment of the application;

FIG. 3 is a flowchart of another random access method provided by an embodiment of this application;

FIG. 4 is a flowchart of another random access method provided by an embodiment of this application;

Fig. 5 is a flowchart of another random access method provided by an embodiment of the application.

Detailed ways

In order to effectively support air equipment, base stations need to provide customized algorithms for air equipment, including interference cancellation, coordinated cell handover, power control, code rate control, etc. The premise that the base station provides the above customized algorithms is that the user equipment can access the base station, and, The base station can recognize that the user equipment is an aerial equipment.

In order to enable aerial equipment to access the base station and the base station to identify the aerial equipment, the first technical idea provided by this application:

To build an independent communication system for air equipment, that is, to use independent spectrum resources and hardware resources for air equipment for access processing and identification processing. In view of the extremely high cost of building an independent communication system in the first solution, the actual application range is relatively small.

In order to enable aerial equipment to access the base station and the base station to identify the aerial equipment, this application provides a second technical idea:

The existing communication system, namely the Long Term Evolution System (LTE), is used to realize the access of the air equipment and the identification of the air equipment.

The existing user equipment in the LTE system is usually used on the ground, so it is called ground equipment. The moving speed of ground equipment is slow, so it can also be called low-speed equipment, and the flying speed of aerial equipment is faster, so it can also be called high-speed equipment.

Since the basic premise of the LTE system design is that the user equipment in the same cell can only be low-speed equipment or high-speed equipment, there are currently no scenarios where low-speed equipment and high-speed equipment coexist in the same cell.

After the introduction of aerial equipment, there are both low-speed equipment and high-speed equipment in a cell. After investigation by the applicant, it is found that since the base station only supports the access of low-speed devices, there is no solution in the LTE system to support the random access of both high-speed devices and low-speed devices in a cell for the time being.

In order to enable aerial equipment to access the base station and the base station to identify the aerial equipment, this application provides a third technical idea:

3GPP provides a communication protocol: In a cell of the LTE system, ground equipment uses existing methods to access the base station, and air equipment uses 3GPP to provide a communication protocol for air equipment to access the base station. In order to identify the accessed user equipment, the base station needs to perform signaling interaction with the user equipment, thereby identifying that the user equipment is a ground device or an air device.

However, in the current LTE system, the base station antenna beam has priority for ground coverage, and there will be a large gain loss in the air. In this case, the stability of the base station using the 3GPP communication protocol by the air equipment is poor.

In addition, the access process and the identification process are two independent processes. In the process of signaling interaction between the user equipment and the base station to identify the user equipment as an air device, the high-speed movement of the air device will cause a large frequency offset in the signaling interaction. , The accuracy of base station recognition will be greatly reduced.

In view of this, this application provides a fourth technical idea: it is suitable for existing LTE systems, and can accurately achieve random access of ground equipment and air equipment in a cell, and when user equipment randomly accesses the base station, Accurately identify user equipment as low-speed equipment or high-speed equipment, so that the base station can subsequently distinguish between air equipment and ground equipment.

The fourth technical concept provided by this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Referring to FIG. 1a, the present application provides a random access system, including a base station 100 and multiple user terminals 200.

Multiple user terminals within the cell of the base station can access the base station to communicate and interact with the base station after being powered on. Or, user terminals in other cells can access the base station to communicate with the base station after entering the range of the base station cell. It is understandable that there is a physical random access channel (PRACH) between the base station and the user equipment, and the user equipment can send an access signal to the physical random access channel for the base station to use the physical random access channel. Receive access signal.

In the existing LTE communication system, a channel resource index table is set in both the base station and the ground equipment, but the original channel resource index table only has the resource location of the ground equipment, which is not applicable to the air equipment.

In order to distinguish between ground equipment and air equipment, this application adds air equipment to the channel resource index table, that is, the resource locations of the air equipment that are part of the resource locations that are not originally occupied by the ground equipment and cannot send access signals.

Refer to Fig. 1b for resource allocation in the time domain, and Fig. 1c for a schematic diagram of resource allocation in the frequency domain. That is, the air equipment is allocated a resource location for sending an access signal to the physical random access channel, and the resource location of the ground equipment does not overlap with the resource location of the air equipment.

After the resource location of the access signal is allocated, when the user equipment needs to access the base station, the air equipment and the ground equipment will send the access signal at their respective resource locations, and the base station will perform detection on the physical random access channel.

If the access signal is detected from the resource location of the ground equipment, the user equipment is accessed, and the access signal of the ground equipment is identified, and subsequent operations are performed according to the processing operation of the ground equipment.

If an access signal is detected from the resource location of the air equipment, the user equipment is accessed, and the access signal of the air equipment is identified, and subsequent operations are performed according to the processing operation of the air equipment.

The following specifically describes the execution process of the base station and the user equipment.

In order to enable the base station to be suitable for random access of ground equipment and air equipment and to identify the user equipment type at the same time, this application needs to perform channel resource allocation operations on the physical random access channel in advance, that is, to allocate channel resources for air equipment.

It is understandable that there are two communication modes between the user equipment and the base station in the communication system: Time Division Duplex (TDD) and Frequency Division Duplex (FDD), so the time domain resource allocation will be performed for the two communication modes respectively. And the description of frequency domain resource allocation.

Regarding the channel resource allocation operation of the physical random access channel, this application provides two implementation manners, and any one of the two implementation manners can be used for channel resource allocation.

The first implementation: time domain resource allocation.

The principle of time domain resource allocation is to separate ground equipment and air equipment from the time domain, and distinguish ground equipment and air equipment through different time domains.

Regarding the communication mode of frequency division duplex FDD adopted by user equipment and base station:

In order to apply to both ground equipment and air equipment, add the channel resource allocation of air equipment in the FDD random access configuration table, add air equipment outside the resource location of the ground equipment, and the system frame number and subframe number of the ground equipment The combined result of is different from the combined result of the system frame number and subframe number of the air equipment; the base station stores the updated FDD random access configuration table.

Refer to Table 1, which is an FDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations. There are 4 preamble formats (0～3). The channel resources of ground equipment and air equipment are distinguished by the system frame number and subframe number. Table 1 shows that the channel resources of ground equipment and air equipment do not overlap.

Table 1

The'-' in Table 1 indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited only In the table above.

For the time division duplex communication mode:

In the time division duplex communication mode, a quadruple is used to determine the resource location. In this embodiment, in addition to the quadruple of the ground equipment, the quadruple of the air equipment is added, and the quadruple of the ground equipment and the quadruple of the air equipment are added. The tuples are different.

Refer to Table 2, which is an FDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations. Ground equipment resources and air equipment resources are distinguished by a four-tuple method. Table 2 shows that the channel resources of ground equipment and air equipment do not overlap.

The four-tuple is

Among them, f _RA is the frequency domain resource index;

Indicate that the accessible resource locations are all system frames, even frames and odd frames;

Indicate the position of the accessible resource is the first half frame and the second half frame;

Indicate the index of the subframe where the accessible resource is located after the special subframe, the index starts from 0; PRACH format 4 is only accessed on the special subframe,

Table 2

Table 2'-' indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited to The table above.

The second implementation mode: frequency domain resource allocation.

The principle of frequency domain resource allocation is as follows: the ground equipment and the air equipment are separated in the frequency domain, and the frequency domain of the ground equipment and the frequency domain of the air equipment belong to different positions.

For the communication mode of frequency division duplex FDD:

The base station originally stores an FDD random access configuration table suitable for ground equipment. In the random access configuration table, only one frequency domain resource location is allocated for each subframe for random access, that is, one time domain corresponds to one frequency domain Location.

In order to distinguish ground equipment from air equipment and expand the communication protocol, add an air equipment frequency domain resource location next to the original frequency domain position, and the two frequency domain positions do not overlap, which means that one time domain corresponds to two different frequencies. Domain location.

In the frequency division duplex mode, the FDD channel resource index table is consistent with Table 1, and will not be repeated here.

For the communication mode of TDD:

Under time division duplex TDD, Table 1 obtained for time domain resource allocation and Table 2 obtained for frequency domain resource allocation will be slightly different, because one subframe of the original LTE system can allocate 1 to 6 frequency domain resources. Add 1 to 2 air device resource locations near the domain resource location (different configurations are selected according to the actual access probability of the air device), and the same resource locations do not overlap.

Refer to Table 3, which is a TDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations.

Ground equipment resources and air equipment resources are distinguished by a four-tuple method. From Table 3, it can be seen that the channel resources of ground equipment and air equipment do not overlap.

Four tuples can be used

Indicates that f _RA is the frequency domain resource index;

Respectively indicate that the accessible resource locations are all system frames, even-numbered frames and odd-numbered frames;

By reconfiguring the last three parameters of the quadruple, time domain resources for random access in the TDD scenario can be added.

table 3

Table 3'-' indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited to The table above.

After allocating channel resources for ground equipment and air equipment, the base station and user equipment will store channel resource index tables for subsequent use. When the user equipment and the base station adopt the frequency division duplex mode, the base station and the user equipment need to store Table 1 (of course, the content in Table 1 can be changed according to actual conditions).

When the user equipment and the base station adopt the time division duplex mode, the base station and the user equipment need to store Table 2 or Table 3 (of course, the contents of Table 2 and Table 3 can be changed according to actual conditions).

The following describes the random access process between the user equipment and the base station. Since there is a time division duplex communication mode and a frequency division duplex communication mode between the user equipment and the base station, the two communication modes are respectively introduced in detail below.

Refer to Figure 2, which is a random access method suitable for frequency division duplex communication mode, including the following steps:

Step S201: The base station generates a broadcast system message and sends it to each user equipment in the cell.

Referring to the foregoing base station pre-preparation process, in the case of frequency division duplexing, the channel resource index table stored by the base station and the user equipment is Table 1. The same channel resource index table is used for time domain resource allocation and frequency domain resource allocation.

Taking Table 1 as an example, in the case of the 64 resource allocation results in Table 1, the base station will select an applicable current channel resource configuration parameter set according to the application scenario, for example, select the current channel resource configuration parameter set with a PRACH configuration index (PRACH Configuration Index) of 0 Channel resource configuration parameter set.

The base station generates a broadcast system message. The broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index), and channel frequency domain offset (prach-FreqOffset). The base station notifies the user equipment in the cell of the broadcast system message, so that the user equipment sends an access signal.

Step S202: From the channel resource index table, determine a current channel resource configuration parameter set corresponding to the PRACH configuration index parameter, where the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channel resource parameters belonging to air Channel resource parameters of the device.

Taking the PRACH configuration index of 0 as an example, a row with the PRACH configuration index of 0 can be determined from Table 1, which is the current channel resource configuration parameter set. Among them, the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment (system frame number is "even", subframe number is "1") and channel resource parameters belonging to air equipment (system frame number is "odd", The subframe number is "1").

Step S203: Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated.

S1: Use the channel frequency domain offset parameter as the frequency domain starting resource position of the ground equipment, and 6 resource blocks starting from the frequency domain starting resource position as the frequency domain resource position of the ground equipment.

set up

To send the starting resource position of the access signal, set

Is the channel frequency domain offset parameter; then

That is, in the frequency division duplex mode, the channel frequency domain offset parameter is used as the frequency domain starting resource position of the ground equipment, and then the 6 resource blocks starting from the frequency domain starting resource position are used as the frequency domain of the ground equipment. Domain resource location.

S2: Determine the system frame number and subframe number as the time domain resource location of the ground equipment.

S3: Determine the frequency domain resource location and the time domain resource location of the ground equipment as the current resource location of the ground equipment.

Step S204: Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated.

S1: Determine the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment.

The frequency domain positions of aerial equipment and ground equipment are different, so set

Indicates the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment.

In frequency division duplex mode, the offset

S2: Determine the frequency domain starting resource position of the ground equipment and the sum of the offset as the frequency domain starting resource position of the aerial equipment, and 6 resource blocks starting from the frequency domain starting resource position As the frequency domain resource location of the aerial equipment.

set up

Indicates the starting resource location of ground equipment; set

Indicates the starting resource location of the air equipment.

but

The calculation method can refer to formula (1).

S3: Use the system frame number and subframe number as the time domain resource location of the air device.

S4: Determine the frequency domain resource location and time domain resource location of the air equipment as the current resource location of the air equipment.

Step S205: Use the ground equipment detection method to perform detection at the current channel resource position belonging to the ground equipment, and use the air equipment detection method to perform detection at the current channel resource position belonging to the air equipment.

The detection method of ground equipment is an existing detection method, and the detection method of air equipment is a detection method of air equipment provided by the 3GPP protocol.

The current channel resource location of the ground equipment determined by the base station in step S203 is performed using the ground device detection algorithm. At the same time, the current channel resource location of the air device determined in step S204 is detected using the detection method of the air device.

Step S206: If an access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system.

It is understandable that if the base station detects the access signal of the user equipment at the resource location belonging to the ground equipment, it is undoubtedly determined that the equipment type of the user equipment is ground equipment, and the ground equipment is connected to the ground equipment in the access mode of the ground equipment. Base station, and use the processing method of ground equipment for subsequent processing.

Step S207: If an access signal of the user equipment is detected at the resource location belonging to the air equipment, identify the user equipment as an air equipment and access the communication system.

It is understandable that if the base station detects the access signal of the user equipment at the resource position belonging to the air equipment, it is undoubtedly determined that the equipment type of the user equipment is the air equipment, and the air equipment is connected to the air equipment by the air equipment access method. Base station, and adopt the processing method of aerial equipment for subsequent processing.

Referring to Figure 3, the following describes the processing process of the user equipment under frequency division duplex:

Step S301: Receive the broadcast system message sent by the base station.

The user equipment receives the broadcast system message sent by the base station. The broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index) and channel frequency domain offset (prach-FreqOffset).

Step S302: Determine a resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment.

It is understandable that the user equipment also stores a channel resource index table. In the frequency division duplex mode, the stored table 1 (the content of Table 1 can be changed according to actual application scenarios, and this step is only an illustrative example).

In the case that the device type of the user equipment is a ground device, the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location.

The process of determining the resource location of the ground equipment can refer to the process of step S203, which is consistent with the process of determining the resource location of the ground equipment by the base station, and will not be repeated here.

The process of determining the resource location of the ground equipment may refer to the process of step S204, which is the same as the process of determining the resource location of the air equipment by the base station, and will not be repeated here.

Step S303: Send an access signal to the resource location.

Another column in the resource index table of Table 1 is the preamble sequence format. When the PRACH Configuration Index (PRACH Configuration Index) is "0", the corresponding preamble sequence format in Table 1 is "0", so the user The device can generate an access signal in a format in which the preamble sequence is "0".

Then, an access signal is sent according to the resource location determined in step S302, so that the base station can access the user equipment based on the access signal.

Refer to Figure 4, which is a random access method suitable for time division duplex communication mode, including the following steps:

Step S401: The base station generates a broadcast system message and sends it to each user equipment in the cell.

Referring to the foregoing base station pre-preparation process, in the case of frequency division duplexing, the channel resource index table stored by the base station and the user equipment is Table 2 or Table 3. Table 2 is used for time domain resource allocation, and Table 3 is used for frequency domain resource allocation.

Taking Table 2 as an example, in the case of the 64 resource allocation results in Table 2, the base station will select an applicable current channel resource configuration parameter set according to the application scenario, for example, select the current channel resource configuration parameter set with a PRACH configuration index (PRACH Configuration Index) of 0 Channel resource configuration parameter set.

Step S402: From the channel resource index table, determine the current channel resource configuration parameter set corresponding to the PRACH configuration index parameter; wherein, the current channel resource configuration parameter set includes the channel resource parameters belonging to ground equipment and those belonging to the air Channel resource parameters of the device.

Taking the PRACH configuration index of 0 as an example, a row with the PRACH configuration index of 0 can be determined from Table 2, which is the current channel resource configuration parameter set. Among them, the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment (quadruple (0,1,0,2)) and channel resource parameters belonging to air equipment (quadruple (0,1,0,1) )).

Step S403: Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated.

S1: Using the frequency domain resource index f _RA and the channel frequency domain offset parameter, the frequency domain starting resource position of the ground equipment is calculated according to a preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are taken as The frequency domain resource location of the ground equipment.

set up

To send the starting resource position of the access signal, set

Is the channel frequency domain offset parameter; then

The frequency domain starting resource position of the ground equipment is calculated by formula (3), and then the 6 resource blocks starting from the frequency domain starting resource position are used as the frequency domain resource position of the ground equipment.

S2: Passed

with

Three parameters determine the time domain resource location of ground equipment.

System frame indicating the location of accessible resources,

Respectively indicate whether the accessible resource location is all system frames, even frames or odd frames,

Indicates whether the location of the accessible resource is the first half frame or the second half frame.

That is, the time domain resource location of the ground equipment can be determined through the last three parameters in the quadruple. When the quadruple of the ground equipment is (0,1,0,2), the following three "1", "0" and "2" are used to determine the time domain resource location.

Step S404: Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated.

S1: The frequency domain start resource position of the air equipment is calculated according to the preset formula through the frequency domain resource index f _RA and the channel frequency domain offset parameter, and the 6 resource blocks starting from the frequency domain start resource position are taken as The frequency domain resource location of the aerial equipment.

set up

To send the starting resource position of the access signal, set

Is the channel frequency domain offset parameter; then

The frequency domain start resource position of the air equipment is calculated by formula (3), and then the 6 resource blocks starting from the frequency domain start resource position are used as the frequency domain resource position of the air equipment. S2: Passed

with

Three parameters determine the time domain resource location of the air equipment.

System frame indicating the location of accessible resources,

That is, the time domain resource location of the air equipment can be determined through the last three parameters in the quadruple. In the case that the quadruple of the air equipment is (0,1,0,1), the following three "1", "0" and "1" are used to determine the time domain resource location.

S3: Determine the frequency domain resource location and the time domain resource location of the air equipment as the current resource location of the air equipment.

Step S405: Use the ground equipment detection method to perform detection at the current channel resource position belonging to the ground equipment, and use the air equipment detection method to perform detection at the current channel resource position belonging to the air equipment.

The current channel resource location of the ground equipment determined by the base station in step S403 is performed using the ground device detection algorithm. At the same time, the current channel resource location of the air device determined in step S404 is detected using the detection method of the air device.

Step S406: If the access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system.

Step S407: If an access signal of the user equipment is detected at the resource location belonging to the air equipment, identify the user equipment as an air equipment and access the communication system.

Referring to Figure 5, the following describes the processing process of the user equipment under frequency division duplex:

Step S501: Receive a broadcast system message sent by a base station.

Step S502: Determine a resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment.

It is understandable that the user equipment also stores a channel resource index table. In the time division duplex mode, the stored table 2 or table 3 (the content of table 2 or table 3 can be changed according to actual application scenarios. This step is only for illustration Sexual examples).

The process of determining the resource location of the ground equipment may refer to the process of step S403, which is consistent with the process of determining the resource location of the ground equipment by the base station, and will not be repeated here.

The process of determining the resource location of the ground equipment can refer to the process of step S404, which is the same as the process of determining the resource location of the air equipment by the base station, and will not be repeated here.

Step S503: Send an access signal to the resource location.

The access signal is sent according to the resource location determined in step S502, so that the base station can access the user equipment based on the access signal.

Through the technical means provided by the embodiments in FIG. 1 to FIG. 5, the following beneficial effects can be achieved:

Since the resource location of the air device is added to the channel resource index table, and the channel resource location of the ground device and the channel resource location of the air device do not overlap, the user equipment can send an access signal at the resource location to which it belongs.

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

The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, this application will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A random access method, characterized in that it is applied to a base station in a long-term evolution system, and the base station stores a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and those belonging to air equipment The channel resource location, and the channel resource location of the ground equipment and the channel resource location of the air equipment do not overlap; the method includes:

Send a broadcast system message to the user equipment in the cell for the user equipment to send an access signal;

Use ground equipment detection methods to detect the location of channel resources belonging to ground equipment, and use aerial equipment detection methods to perform detection at the location of channel resources belonging to air equipment;

If the access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system;

If the access signal of the user equipment is detected at the resource location belonging to the air equipment, the user equipment is identified as an air equipment and accesses the communication system.
The access method according to claim 1, wherein the broadcast system message includes a PRACH configuration index parameter and a channel frequency domain offset parameter;

Then the method of using ground equipment detection to perform detection at the location of channel resources belonging to ground equipment, and using the detection method of air equipment to perform detection at the location of channel resources belonging to air equipment includes:

From the channel resource index table, determine the current channel resource configuration parameter set corresponding to the PRACH configuration index parameter; wherein, the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channels belonging to air equipment Resource parameters;

Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated;

Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated;

The ground equipment detection method is used to perform detection at the current channel resource position belonging to the ground equipment, and the air equipment detection method is used to perform detection at the current channel resource position belonging to the air equipment.
The access method according to claim 2, wherein when the frequency division duplex mode is adopted between the user equipment and the base station, the channel resource parameters of the ground equipment include a system frame number and a subframe number; wherein, the ground equipment The combination result of the corresponding system frame number and subframe number is different from the combination result of the system frame number and subframe number corresponding to the aerial equipment;

Then the calculation based on the channel resource parameter of the ground device and the channel frequency domain offset parameter to obtain the current resource location belonging to the ground device includes:

Taking the channel frequency domain offset parameter as the frequency domain start resource position of the ground equipment, and 6 resource blocks starting from the frequency domain start resource position as the frequency domain resource position of the ground equipment;

Determining the system frame number and subframe number as the time domain resource location of the ground equipment;

The frequency domain resource location and the time domain resource location of the ground equipment are determined as the current resource location of the ground equipment.
The method according to claim 2, wherein in the frequency division duplex mode between the user equipment and the base station, the channel resource parameters of the air equipment include a system frame number and a subframe number; wherein, the air equipment corresponds to The combined result of the system frame number and subframe number is different from the combined result of the system frame number and subframe number corresponding to the ground equipment;

Then the calculation based on the channel resource parameter of the air device and the channel frequency domain offset parameter to obtain the current resource location belonging to the air device includes:

Determine the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment;

Determine the frequency domain starting resource position of the ground equipment and the sum of the offset as the frequency domain starting resource position of the air equipment, and the 6 resource blocks starting from the frequency domain starting resource position as the air equipment’s Frequency domain resource location;

Use the system frame number and subframe number as the time domain resource location of the air device;

The frequency domain resource location and the time domain resource location of the air equipment are determined as the current resource location of the air equipment.
The access method according to claim 2, wherein when the time division duplex mode is adopted between the user equipment and the base station, the channel resource parameter of the ground equipment includes a quadruple
Among them, the ground equipment corresponds to the quadruple, and the air equipment corresponds to the quadruple is different;

Then the calculation based on the channel resource parameter of the ground device and the channel frequency domain offset parameter to obtain the current resource location belonging to the ground device includes:

According to the frequency domain resource index f RA and the channel frequency domain offset parameter, the frequency domain starting resource position of the ground equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the ground equipment The frequency domain resource location;

pass through
with
Three parameters determine the time domain resource location of ground equipment; among them
System frame indicating the location of accessible resources,
Indicate the first half frame or the second half frame of the accessible resource location,
Indicates the index of the subframe where the location of the accessible resource is located after the special subframe,
Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames,
Indicate whether the location of the accessible resource is the first half frame or the second half frame;

The frequency domain resource location and the time domain resource location of the ground equipment are determined as the current resource location of the ground equipment.
The method according to claim 2, wherein when the time division duplex mode is adopted between the user equipment and the base station, the channel resource parameter of the air equipment includes a quadruple
Among them, the ground equipment corresponds to the quadruple, and the air equipment corresponds to the quadruple is different;

Then the calculation based on the channel resource parameter of the air device and the channel frequency domain offset parameter to obtain the current resource location belonging to the air device includes:

According to the frequency domain resource index f RA and the channel frequency domain offset parameter, the frequency domain starting resource position of the air equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the air equipment The frequency domain resource location;

pass through
with
Three parameters determine the time domain resource location of the air equipment; among them
System frame indicating the location of accessible resources,
Indicate the first half frame or the second half frame of the accessible resource location,
Indicates the index of the subframe where the location of the accessible resource is located after the special subframe,
Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames,
Indicate whether the location of the accessible resource is the first half frame or the second half frame;

The frequency domain resource location and the time domain resource location of the air equipment are determined as the current resource location of the air equipment.
The method according to claim 1, wherein the channel resource index table stored by the base station comprises:

When the user equipment and the base station adopt the frequency division duplex mode, both the base station and the user equipment store the FDD channel resource index table; among them, the FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes The channel resource parameters of the ground equipment and the channel resource parameters of the air equipment;

When the user equipment and the base station adopt the time division duplex mode, both the base station and the user equipment store a TDD channel resource index table, and the TDD channel resource index table includes a TDD time domain channel resource index table after dividing time domain resources, or, for TDD frequency domain channel resource index table after frequency domain resource division;

The FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channel resource parameters belonging to air equipment.
A random access method, characterized in that it is applied to a user equipment, and the user equipment stores a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channel resource positions belonging to air equipment And, the position of the channel resource belonging to the ground equipment and the position of the channel resource belonging to the air equipment do not overlap; the method includes:

Receive broadcast system messages sent by the base station;

Determine the resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment;

Sending an access signal to the resource location.
The method according to claim 8, characterized in that it comprises:

In the case that the device type of the user equipment is a ground device, the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location;

In the case where the device type of the user equipment is an air device, the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource corresponding to the broadcast system message and belonging to the air device Location.
A random access system, characterized in that it comprises a base station and a plurality of user terminals. The base station and the user terminals each store a channel resource index table, wherein the channel resource index table includes the position of the channel resource belonging to the ground equipment and the position of the channel resource belonging to the ground equipment. The position of the channel resource of the aerial equipment, and the position of the channel resource belonging to the ground equipment and the position of the channel resource belonging to the aerial equipment do not overlap;

The user terminal is configured to receive a broadcast system message sent by a base station, and based on the broadcast system message and the device type of the user equipment, determine the resource location corresponding to the broadcast system message and the device type, and send it to the resource The location sends an access signal;

The base station is used to send broadcast system messages to the user equipment in the cell for the user equipment to send access signals, use the ground equipment detection method to detect the position of the channel resources belonging to the ground equipment, and use the air equipment detection method to perform the detection in the air The channel resource location of the device is detected. If the user equipment's access signal is detected at the resource location of the ground device, the user equipment is identified as a ground device and connected to the communication system. If the user equipment is detected at the resource location of the air device If the access signal is detected, the user equipment is identified as an aerial device and connected to the communication system.