CN105812035A - Grade beam access method and device - Google Patents

Abstract

The invention discloses a grade beam access method and device. The method comprises the step that a first node uses at least two beam groups to send a correlation signal and/or channel in a downlink access process, wherein a beam group consists of one or more beams. According to the invention, the problem that the first node or a second node cannot efficiently acquire an optimal beam in related technologies is solved; different signal to noise ratios are provided for signals and channels; and a reliable and rapid access process is provided.

Description

Hierarchical beam access method and device

Technical Field

The invention relates to the field of communication, in particular to a hierarchical beam access method and a hierarchical beam access device.

Background

In high frequency communication, since a higher carrier frequency is used for transmission, the average path loss is much larger than that of a conventional long term evolution Advanced system (LTE-Advanced), for example, we use a carrier frequency of 28GHz for transmission, and use the formula:

$L_f={\left(\frac{4\mathrm{\πR}}{\mathrm{\λ}}\right)}^2$

the average proportion information of the high-frequency path loss value and the LTE path loss value is calculated as follows:

$L_H/L_L={\left(\frac{4\mathrm{\πR}}{{\mathrm{\λ}}_H}\right)}^2/{\left(\frac{4\mathrm{\πR}}{{\mathrm{\λ}}_L}\right)}^2{={\left(\frac{{\mathrm{\λ}}_L}{{\mathrm{\λ}}_H}\right)}^2}^{}\≈100$

in order to ensure coverage in high frequency communication, that is, a receiving side meets a requirement of minimum signal to interference plus noise ratio (SINR), it is necessary to increase gains of a transmitting and a receiving device.

$P_r=P_t{G}_t{G}_r{\left(\frac{\mathrm{\λ}}{4\mathrm{\πR}}\right)}^2=P_t{G}_t{G}_r/L_f$

Wherein, R is the radius covered by the cell, lambda is the wavelength of the corresponding carrier wave, G_tFor transmitting antenna gain, G_rIs the receive antenna gain.

The LTE communication demand is highest to cover an area of 100km, and if only the average path loss (open area) is considered according to the highest coverage, the high-frequency communication may be highest to cover an area of 1 km. If the characteristics of high air absorption (oxygen absorption, rain fading and fog fading) and sensitivity to shadow fading and the like of the actual high-frequency carrier wave are considered, the coverage which can be actually supported is less than 1 km.

If the high-frequency communication supports the maximum coverage of 1km, compared with the LTE system, the SINR ratio which can be obtained in the same coverage area is different, the signal-to-noise ratio of the former is reduced by at least 20dB compared with that of the latter, and in order to ensure that the high-frequency communication has approximate SINR within the coverage area of the LTE system, the antenna gain of the high-frequency communication needs to be ensured. It is worth to be fortunate here that since the high frequency communication has a shorter wavelength, it can be ensured that more antenna elements are accommodated in a unit area, and more antenna elements can provide a higher antenna gain, thereby ensuring the coverage performance of the high frequency communication.

More antenna elements means that we can use beamforming method to ensure the coverage of high frequency communication. As known from the previous design concept of LTE, to obtain a good beamforming effect, it is necessary to accurately obtain state information of a channel, so as to obtain beamforming weights from the state information of the channel. And a better beamforming weight is obtained, for the first node at the transmitting end, the second node at the receiving end needs to feed back downlink channel state information or a weight, and for the receiving end, the first node at the transmitting end needs to feed back uplink channel state information or a weight, so that the first node can transmit downlink services by using an optimal beam, and the second node can also transmit uplink services by using an optimal beam. At this time, there is a problem of 'laying a chicken, laying a chicken', and a first node cannot cover a receiving end with an optimal beam before obtaining a weight, so that the receiving end cannot measure a reference signal sent by the first node to perform measurement, or even if the first node covers a second node, the second node cannot reach the same coverage of the first node, and the first node cannot know the feedback content, so that the selection of the beam weight and normal communication cannot be performed. The optimal method for solving the problem is to add a discovery process, and the first node and the second node can discover each other through the discovery process, so that communication is performed by using the optimal weight value.

In short, the discovery process is a training process, and the transmitting end sends a plurality of beam sequence signals (discovery signals) in advance to enable the receiving end to detect the sequence, obtain the beam sequence number and feed back the beam sequence number, so that preliminary communication can be performed after the transmitting end and the receiving end find that the beam sequence number exists.

When the second node performs synchronization, it needs to detect a synchronization signal for time synchronization and frequency synchronization, and at the same time, the second node needs to detect a discovery signal to obtain the optimal beam index information. In addition, the second node can simultaneously obtain time synchronization and frequency synchronization and optimal beam index information by detecting the synchronization signal.

For the problem that the first node or the second node cannot efficiently acquire the optimal beam in the related art, an effective solution has not been proposed yet.

Disclosure of Invention

The invention provides a hierarchical beam access method and a hierarchical beam access device, which are used for at least solving the problem that a first node or a second node in the related technology cannot efficiently acquire an optimal beam.

According to an aspect of the present invention, there is provided a hierarchical beam access method, including: the first node transmits related signals and/or channels in a downlink access process by utilizing at least two stages of beam groups, wherein the beam group is composed of one or more beams.

Further, the related signals and/or channels in the downlink access process at least include signals and/or channels of one of the following: signals and/or channels for identifying downlink transmit beams; a downlink access response signal and/or channel for responding to the uplink access signal and/or channel; and the indication signal and/or the channel are used for responding to the uplink access configuration information.

Further, the coverage space of a lower-level beam group of the at least two-level beam groups is a combined coverage space of one or more higher-level beam groups of the at least two-level beam groups; alternatively, said one low level beam group comprises said one or more high level beam groups; or, the coverage of the one low-level beam group consists of one or more high-level beam group coverage; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

Further, the transmitting, by the first node, the relevant signal and/or channel in the downlink access process by using at least two stages of beam groups includes: the first node transmits channels and/or signals with beam characteristics by utilizing a first primary downlink transmission beam group; wherein the channel and/or signal information is used to indicate information of at least one of: identifying downlink transmission beams, synchronizing the downlink transmission beams, indicating access configuration information and informing system configuration information; the indication access configuration information comprises information of at least one of the following: the first primary downlink transmission beam group includes at least one first primary downlink beam.

Further, the first node receives an uplink access signal and/or a channel sent by the second node at a predefined or configured uplink sending moment; and the first node acquires a beam index corresponding to a beam in a second-level downlink transmission beam group through the uplink access signal and/or the channel.

Further, the first node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the second primary downlink transmission beam group, and transmits response information of the uplink access channel and/or signal by using the first secondary downlink transmission beam group.

Further, the first node receives, on a predefined or preconfigured time-frequency resource, uplink access configuration information and/or a measurement reference signal sent by the second node, where the uplink access configuration information includes an uplink Media Access Control (MAC) layer message.

Further, the uplink access configuration information further includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

Further, the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

Further, the first node selects an optimal downlink transmission beam or multiple optimal downlink transmission beams for forming a third-level downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second-level downlink transmission beam group.

Further, the first node transmits the uplink access configuration information response indication by using the third secondary downlink transmission beam group.

Further, the information interaction between the first node and the second node through the wave array comprises: and the first node performs initial control signaling and/or data interaction with the second node by using the third-level downlink transmission beam group.

Further, the second primary downlink transmission beam group is one or more optimal downlink beams obtained by the second node when detecting the first primary downlink transmission beam group.

Further, the downlink beam is judged to be the optimal downlink beam according to at least one of the following principles: the downlink wave beam is the downlink wave beam with the optimal quality; the downlink wave beam is the downlink wave beam with the minimum interference; the downlink beam is the downlink beam with the minimum power overhead.

According to another aspect of the present invention, there is also provided a hierarchical beam access method, including: the first node indicates at least two levels of beam groups for selection of uplink transmit beams, the beam groups consisting of one or more beams.

Further, the signals and/or channels indicating that the two-stage beam group carries relevant signals and/or channels in the downlink access process include one of the following signals and/or channels: a downlink access response signal or channel for responding to the uplink access signal and/or channel; an indication signal or channel for responding to the uplink access configuration information.

Further, the coverage space of a lower-level beam group is the combined coverage space of one or more higher-level beam groups of the at least two-level beam groups; alternatively, said one low level beam group comprises said one or more high level beam groups; or, the coverage of the one low-level beam group consists of one or more high-level beam group coverage; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

Further, the first node transmits a channel and/or signal having beam characteristics, the channel and/or signal information being used for information indicating at least one of: synchronizing, indicating access configuration information and informing system configuration information; the indication access configuration information comprises information of at least one of the following: and the time-frequency code resource of the first primary uplink transmission beam group, and the transmission power indication information of the uplink access signal and/or the channel.

Further, the first node receives an uplink access signal and/or a channel transmitted by the second node by using the first primary uplink transmission beam group at a predefined or configured uplink transmission time.

Further, the first node sends uplink access channel and/or signal response information to the second node, and the uplink access channel and/or signal response information carries a beam index corresponding to a beam in the second-level uplink transmission beam group.

Further, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal.

Further, the first node receives, on a predefined or preconfigured time-frequency resource, that the second node transmits uplink access configuration information and/or measurement reference signals using the first secondary uplink transmission beam group, where the access configuration information includes an uplink access media access control, MAC, layer message.

Further, the first node predefines a first secondary uplink transmission beam group as one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

Further, the first node sends an uplink access configuration information response indication, where the uplink access configuration information response indication carries a beam index corresponding to a beam in the second-level uplink transmission beam group.

Further, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or a measurement reference signal.

Further, the first node and the second node perform interaction of initial control signaling and/or data.

According to another aspect of the present invention, there is provided a hierarchical beam access method, including: and the second node transmits related signals and/or channels in the uplink access process by utilizing at least two stages of beam groups, wherein the beam group consists of one or more beams.

Further, the related signals and/or channels in the uplink access process include signals and/or channels of at least one of the following: signals and/or channels for identifying uplink transmission beams; signals and/or channels for uplink access; uplink access configuration signals and/or channels.

Further, there is a correlation between the at least two levels of beam groups, and one or more high level beam group characteristics may be obtained by lower level beam group characteristics.

Further, a low-level beam group is a combination of one or more high-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

Further, the second node transmits uplink access signals and/or channels by using the first primary uplink transmission beam group in predefined or configured uplink transmission time-frequency code resources.

Further, the second node transmits uplink access configuration information and/or measurement reference signals by using a first secondary uplink transmission beam group on a predefined or preconfigured time-frequency resource, wherein the access configuration information includes an uplink access media access control, MAC, layer message.

Further, the first secondary uplink transmission beam group is one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

Further, the second node selects an optimal third-level uplink transmission beam group according to a predefined or preconfigured principle according to the received second-level uplink transmission beam group index, and performs initial control signaling and/or data interaction with the first node by using the third-level uplink transmission beam group.

According to another aspect of the present invention, there is also provided a hierarchical beam access method, including: the second node detects that the first node utilizes at least two stages of beam groups to send related signals and/or channels in the downlink access process, wherein the beam group is composed of one or more beams.

Further, the related signals and/or channels in the uplink access process include at least the following signals and/or channels: signals and/or channels for identifying uplink transmission beams; signals and/or channels for uplink access; uplink access configuration signals and/or channels.

Further, there is a correlation between the at least two levels of beam groups, and one or more high level beam group characteristics may be obtained by lower level beam group characteristics.

Further, a low-level beam group is a combination of one or more high-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

Further, the second node detects, on a predefined or configured time-frequency code resource, a channel and/or a signal with beam characteristics, which is sent by the first node using a first primary downlink transmission beam group, where the channel and/or signal information is used for at least one of identification, synchronization, indication of access configuration information, and notification of system configuration information of a downlink transmission beam, and the first primary downlink transmission beam group includes at least one first primary downlink beam.

Further, the second node detects at least one of time-frequency code resources of the first primary uplink transmission beam group, transmission power indication information of an uplink access signal and/or a channel in the indication access configuration information.

Further, the second-level downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first-level downlink transmission beam group.

Further, the optimal selection principle includes at least one of the following: optimal quality, minimal interference and minimal power overhead.

Further, the second node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second primary downlink transmission beam group according to the first node, and receives, on a predefined or preconfigured resource, the uplink access channel and/or the signal response information sent by the first node by using the first secondary downlink transmission beam group.

Further, the second node obtains a beam index corresponding to a beam in the second-level uplink transmission beam group from the uplink access channel and/or the signal response information.

Further, the second node selects an optimal uplink transmission beam for the first node according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal according to a beam corresponding to a beam in the second-level uplink transmission beam group.

Further, the access configuration information includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

Further, the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detecting the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

Further, the second node receives, on a predefined or preconfigured time-frequency code resource, an uplink access configuration information response indication sent by the first node by using a third secondary downlink transmission beam group, and obtains, in the uplink access configuration information response indication, a beam index corresponding to a beam in the second secondary uplink transmission beam group.

Further, the second node predefines the first node to select an optimal one or more downlink transmission beams for forming a low third-level downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second-level downlink transmission beam group.

Further, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or a measurement reference signal.

According to an aspect of the present invention, there is also provided a hierarchical beam access apparatus, which is applied to a first node, and includes: a sending module, configured to send a relevant signal and/or channel in a downlink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

According to an aspect of the present invention, there is also provided a hierarchical beam access apparatus, which is applied to a first node, and includes: the device comprises an indicating module, a receiving module and a transmitting module, wherein the indicating module is used for at least indicating two-stage beam groups to be used for selecting uplink transmitting beams, and the beam group is composed of one or more beams.

According to an aspect of the present invention, there is also provided a hierarchical beam access apparatus, which is applied to a second node, and includes: a sending module, configured to send a relevant signal and/or channel in an uplink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

According to an aspect of the present invention, there is also provided a hierarchical beam access apparatus, which is applied to a second node, and includes: the first node sends a downlink access request to a first node, wherein the downlink access request comprises a downlink access request, and the first node sends a downlink access request to the first node.

According to the invention, the first node is adopted to send the related signals and/or channels in the downlink access process by utilizing at least two stages of beam groups; wherein a beam group is formed by one or more beams. The problem that the first node or the second node cannot efficiently acquire the optimal beam in the related technology is solved, and different signal-to-noise ratios are provided for channels and signals, so that a more reliable and faster access process is provided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a flow chart of a hierarchical beam access method according to an embodiment of the present invention;

fig. 2 is a flow chart (1) of a hierarchical beam access method according to an embodiment of the present invention;

fig. 3 is a flowchart (2) of a hierarchical beam access method according to an embodiment of the present invention;

fig. 4 is a flowchart (3) of a hierarchical beam access method according to an embodiment of the present invention;

fig. 5 is a block diagram of a hierarchical beam access apparatus according to an embodiment of the present invention;

fig. 6 is a block diagram (1) of a hierarchical beam access apparatus according to an embodiment of the present invention;

fig. 7 is a block diagram (2) of the structure of a hierarchical beam access apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram (3) of the structure of a hierarchical beam access apparatus according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a two-stage beam group access training process according to an embodiment of the present invention;

fig. 10(a), 10(b) are schematic diagrams of low-level beams and high-level beams according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In this embodiment, a hierarchical beam access method is provided, and fig. 1 is a flowchart of a hierarchical beam access method according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:

step S102, the first node transmits relevant signals and/or channels in the downlink access process by utilizing at least two levels of beam groups, wherein the beam group is composed of one or more beams.

Through the steps, the first node sends the related signals and/or channels in the downlink access process by utilizing the at least two stages of beam groups, the problem that the first node or the second node cannot efficiently obtain the optimal beams in the related technology is solved, different signal-to-noise ratios are provided for the channels and the signals, and therefore a more reliable and rapid access process is provided.

There may be many related signals and/or channels in the downlink access procedure, and in an alternative embodiment, the signals and/or channels may be signals and/or channels for identifying downlink transmission beams, may be downlink access response signals and/or channels for responding to the uplink access signals and/or channels, and may also be indication signals and/or channels for responding to the uplink access configuration information.

In an alternative embodiment, the coverage space of a lower-level beam group of the at least two-level beam groups is a combined coverage space of one or more higher-level beam groups of the at least two-level beam groups; alternatively, the one lower level beam group comprises the one or more higher level beam groups; alternatively, the coverage of a low-level beam group consists of the coverage of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group. The low-level beam refers to a beam with a large beam coverage and a wide beam width, as shown in fig. 10 (a); the high-level beam refers to a beam with a small beam coverage and a narrow beam width, as shown in fig. 10 (b). A lower level beam may be subdivided into a plurality of higher level beams and the higher level beams may be further subdivided into higher level beams.

In the step S102, the first node uses at least two levels of beam groups to transmit the relevant signals and/or channels in the downlink access process, and in an optional embodiment, the first node uses a first primary downlink transmission beam group to transmit the channels and/or signals with beam characteristics; wherein the channel and/or signal information is used to indicate information of at least one of: identifying downlink transmission beams, synchronizing the downlink transmission beams, indicating access configuration information and informing system configuration information; the indication access configuration information includes information of at least one of: the first primary downlink transmit beam group includes at least one first primary downlink beam.

In a process that the first node receives an uplink access signal and/or a channel sent by the second node at a predefined or configured uplink sending time, in an optional embodiment, the first node obtains a beam index corresponding to a beam in the second-stage downlink sending beam group through the uplink access signal and/or the channel.

In an optional embodiment, the first node selects the first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the second primary downlink transmission beam group, and transmits the response information of the uplink access channel and/or signal by using the first secondary downlink transmission beam group.

In an optional embodiment, the first node receives, on a predefined or preconfigured time-frequency resource, uplink access configuration information and/or a measurement reference signal sent by the second node, where the uplink access configuration information includes an uplink access Media Access Control (MAC) layer message.

The uplink access configuration information may include various information, and in an optional embodiment, may include a beam index corresponding to a beam in the second-level downlink transmission beam group.

In an optional embodiment, the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detecting the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

In an optional embodiment, the first node selects, according to a predefined or preconfigured principle, an optimal one or more downlink transmission beams for forming a third secondary downlink transmission beam group by using the obtained second secondary downlink transmission beam group.

In an optional embodiment, the first node transmits the uplink access configuration information response indication by using the third secondary downlink transmission beam group.

In the process of information interaction between the first node and the second node through the wave array, in an optional embodiment, the first node performs initial control signaling and/or data interaction with the second node by using the third secondary downlink transmission beam group.

In an optional embodiment, the second primary downlink transmission beam group is one or more optimal downlink beams obtained when the second node detects the first primary downlink transmission beam group.

There may be many principles for determining the downlink beam as the optimal downlink beam, and in an optional embodiment, the determination principle may be that the downlink beam is the downlink beam with the optimal quality, the downlink beam is the downlink beam with the minimum interference, or the downlink beam is the downlink beam with the minimum power overhead.

Wherein, the first primary downlink wave beam (group), the second primary downlink wave beam (group), the first primary uplink wave beam (group), and the second primary uplink wave beam (group) all belong to the low-level wave beam (group). The first secondary downlink beam (group), the second secondary downlink beam (group), the third secondary downlink beam (group), the first secondary uplink beam (group), the second secondary uplink beam (group), and the third secondary uplink beam (group) all belong to the high-level beam (group).

In an optional embodiment, the first node comprises at least one of: macro base stations, micro base stations, pico base stations, home base stations, relays, wireless access points; the second node comprises at least one of: data card, cell phone, notebook computer, personal computer, tablet computer, personal digital assistant, bluetooth, relay, remote device, wireless access point.

In this embodiment, another hierarchical beam access method is further provided, and fig. 2 is a flowchart (1) of the hierarchical beam access method according to the embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:

step S202, the first node indicates at least two levels of beam groups for selecting uplink transmission beams, where a beam group is composed of one or more beams.

Through the steps, the first node at least indicates two levels of beam groups to be used for selecting the uplink transmission beam, the problem that the first node or the second node cannot efficiently acquire the optimal beam in the related technology is solved, different signal-to-noise ratios are provided for channels and signals, and therefore a more reliable and rapid access process is provided.

There may be many related signals and/or channels indicating that the two-stage beam group is carried in the downlink access process, and in an alternative embodiment, the related signals and/or channels may be downlink access response signals or channels for responding to the uplink access signals and/or channels, and may also be indication signals or channels for responding to the uplink access configuration information.

In an alternative embodiment, the coverage space of a lower-level beam group is the combined coverage space of one or more higher-level beam groups of the at least two-level beam groups; alternatively, a low-level beam group includes the one or more high-level beam groups; alternatively, the coverage of the one low-level beam group consists of one or more high-level beam group coverage; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group. The low-level beam refers to a beam with a large beam coverage and a wide beam width, as shown in fig. 10 (a); the high-level beam refers to a beam with a small beam coverage and a narrow beam width, as shown in fig. 10 (b). A lower level beam may be subdivided into a plurality of higher level beams and the higher level beams may be further subdivided into higher level beams.

In an alternative embodiment, the first node transmits a channel and/or signal having beam characteristics, the channel and/or signal information being indicative of at least one of: synchronizing, indicating access configuration information and informing system configuration information; the indication access configuration information includes information of at least one of: and the time-frequency code resource of the first primary uplink transmission beam group, and the transmission power indication information of the uplink access signal and/or the channel.

In an optional embodiment, the first node receives, at a predefined or configured uplink transmission time, an uplink access signal and/or a channel transmitted by the second node using the first primary uplink transmission beam group.

In an optional embodiment, the first node sends uplink access channel and/or signal response information to the second node, and the uplink access channel and/or signal response information carries a beam index corresponding to a beam in the second-stage uplink transmission beam group. In another optional embodiment, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal.

In an optional embodiment, the first node receives, on a predefined or preconfigured time-frequency resource, uplink access configuration information and/or measurement reference signals transmitted by the second node using the first secondary uplink transmission beam group, where the access configuration information includes an uplink access media access control, MAC, layer message.

In an optional embodiment, the first node predefines the first secondary uplink transmission beam group as one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

In an optional embodiment, the first node sends an uplink access configuration information response indication, where the uplink access configuration information response indication carries a beam index corresponding to a beam in the second-level uplink transmission beam group. In another optional embodiment, the beam corresponding to the beam in the second secondary uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or measurement reference signals.

In an alternative embodiment, the first node and the second node perform an initial control signaling and/or data interaction.

Wherein, the first primary downlink wave beam (group), the second primary downlink wave beam (group), the first primary uplink wave beam (group), and the second primary uplink wave beam (group) all belong to the low-level wave beam (group). The first secondary downlink beam (group), the second secondary downlink beam (group), the third secondary downlink beam (group), the first secondary uplink beam (group), the second secondary uplink beam (group), and the third secondary uplink beam (group) all belong to the high-level beam (group).

In an optional embodiment, the first node comprises at least one of: macro base stations, micro base stations, pico base stations, home base stations, relays, wireless access points; the second node comprises at least one of: data card, cell phone, notebook computer, personal computer, tablet computer, personal digital assistant, bluetooth, relay, remote device, wireless access point.

In this embodiment, another hierarchical beam access method is further provided, and fig. 3 is a flowchart (2) of the hierarchical beam access method according to the embodiment of the present invention, as shown in fig. 3, the flowchart includes the following steps:

step S302, the second node transmits a related signal and/or channel in the uplink access process by using at least two levels of beam groups, where the beam group is formed by one or more beams.

Through the steps, the second node sends the related signals and/or channels in the uplink access process by utilizing the at least two stages of beam groups, the problem that the first node or the second node cannot efficiently obtain the optimal beams in the related technology is solved, different signal-to-noise ratios are provided for the channels and the signals, and therefore a more reliable and rapid access process is provided.

The related signals and/or channels in the uplink access procedure may include many kinds, and in an alternative embodiment, the related signals and/or channels may be signals and/or channels for identifying uplink transmission beams, signals and/or channels for performing uplink access, and uplink access configuration signals and/or channels.

In an alternative embodiment, there is a correlation between at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

In an alternative embodiment, a lower-level beam group is a combination of one or more higher-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group. The low-level beam refers to a beam with a large beam coverage and a wide beam width, as shown in fig. 10 (a); the high-level beam refers to a beam with a small beam coverage and a narrow beam width, as shown in fig. 10 (b). A lower level beam may be subdivided into a plurality of higher level beams and the higher level beams may be further subdivided into higher level beams.

In an optional embodiment, the second node transmits uplink access signals and/or channels by using the first primary uplink transmission beam group in predefined or configured uplink transmission time-frequency code resources.

In an optional embodiment, the second node transmits uplink access configuration information and/or measurement reference signals using the first secondary uplink transmission beam group on a predefined or preconfigured time-frequency resource, wherein the access configuration information comprises an uplink access medium access control, MAC, layer message. In another optional embodiment, the first secondary uplink transmission beam group is one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

In an optional embodiment, the second node selects an optimal third-level uplink transmission beam group according to a predefined or preconfigured principle according to the received second-level uplink transmission beam group index, and performs initial control signaling and/or data interaction with the first node by using the third-level uplink transmission beam group.

Wherein, the first primary downlink wave beam (group), the second primary downlink wave beam (group), the first primary uplink wave beam (group), and the second primary uplink wave beam (group) all belong to the low-level wave beam (group). The first secondary downlink beam (group), the second secondary downlink beam (group), the third secondary downlink beam (group), the first secondary uplink beam (group), the second secondary uplink beam (group), and the third secondary uplink beam (group) all belong to the high-level beam (group).

In an optional embodiment, the first node comprises at least one of: macro base stations, micro base stations, pico base stations, home base stations, relays, wireless access points; the second node comprises at least one of: data card, cell phone, notebook computer, personal computer, tablet computer, personal digital assistant, bluetooth, relay, remote device, wireless access point.

In this embodiment, another hierarchical beam access method is further provided, and fig. 4 is a flowchart (3) of the hierarchical beam access method according to the embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S402, the second node detects that the first node utilizes at least two levels of beam groups to send the relevant signals and/or channels in the downlink access process, wherein the beam group is composed of one or more beams.

Through the steps, the second node detects that the first node sends the related signals and/or channels in the downlink access process by utilizing at least two stages of beam groups, the problem that the first node or the second node cannot efficiently obtain the optimal beams in the related technology is solved, different signal-to-noise ratios are provided for the channels and the signals, and therefore a more reliable and rapid access process is provided.

There may be many related signals and/or channels in the uplink access process, and in an optional embodiment, the related signals and/or channels may be signals and/or channels for identifying an uplink transmission beam, signals and/or channels for performing uplink access, and uplink access configuration signals and/or channels.

In an alternative embodiment, there is a correlation between at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

In an alternative embodiment, a lower-level beam group is a combination of one or more higher-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group. The low-level beam refers to a beam with a large beam coverage and a wide beam width, as shown in fig. 10 (a); the high-level beam refers to a beam with a small beam coverage and a narrow beam width, as shown in fig. 10 (b). A lower level beam may be subdivided into a plurality of higher level beams and the higher level beams may be further subdivided into higher level beams.

In an optional embodiment, the second node detects, on predefined or configured time-frequency code resources, a channel and/or a signal with beam characteristics, which is sent by the first node using a first primary downlink transmission beam group, where the channel and/or signal information is used for at least one of identification, synchronization, indication of access configuration information, and notification of system configuration information of a downlink transmission beam, and the first primary downlink transmission beam group includes at least one first primary downlink beam.

In an optional embodiment, the second node detects, in the indication access configuration information, at least one of time-frequency code resources of the first primary uplink transmission beam group, transmission power indication information of the uplink access signal and/or the channel.

In an optional embodiment, the second primary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first primary downlink transmission beam group. In another alternative embodiment, the optimal selection criteria includes at least one of: optimal quality, minimal interference and minimal power overhead.

In an optional embodiment, the second node selects the first secondary downlink transmission beam group according to a predefined or preconfigured principle according to the second primary downlink transmission beam group obtained by the first node, and receives, on a predefined or preconfigured resource, the uplink access channel and/or the signal response information sent by the first node by using the first secondary downlink transmission beam group.

In an optional embodiment, the second node obtains, in the uplink access channel and/or the signal response information, a beam index corresponding to a beam in the second-stage uplink transmission beam group.

In an optional embodiment, the second node selects, according to a beam corresponding to a beam in the second-level uplink transmission beam group, an optimal uplink transmission beam for the first node by detecting an uplink access channel and/or a signal according to a predefined or preconfigured principle. In another optional embodiment, the access configuration information includes a beam index corresponding to a beam in the second secondary downlink transmission beam group.

In an optional embodiment, the second secondary downlink transmit beam group is one or more optimal downlink beams obtained by the second node by detecting the first secondary downlink transmit beam group according to a predefined or preconfigured principle.

In an optional embodiment, the second node receives, on a predefined or preconfigured time-frequency code resource, an uplink access configuration information response indication sent by the first node by using the third secondary downlink transmission beam group, and obtains, in the uplink access configuration information response indication, a beam index corresponding to a beam in the second secondary uplink transmission beam group.

In an optional embodiment, the second node predefines the first node to select an optimal one or more downlink transmission beams for forming the lower-three secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second secondary downlink transmission beam group.

In an optional embodiment, the beam corresponding to the beam in the second secondary uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or a measurement reference signal.

Wherein, the first primary downlink wave beam (group), the second primary downlink wave beam (group), the first primary uplink wave beam (group), and the second primary uplink wave beam (group) all belong to the low-level wave beam (group). The first secondary downlink beam (group), the second secondary downlink beam (group), the third secondary downlink beam (group), the first secondary uplink beam (group), the second secondary uplink beam (group), and the third secondary uplink beam (group) all belong to the high-level beam (group).

In an optional embodiment, the first node comprises at least one of: macro base stations, micro base stations, pico base stations, home base stations, relays, wireless access points; the second node comprises at least one of: data card, cell phone, notebook computer, personal computer, tablet computer, personal digital assistant, bluetooth, relay, remote device, wireless access point.

In this embodiment, a hierarchical beam access apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 5 is a block diagram of a hierarchical beam access apparatus according to an embodiment of the present invention, the apparatus being applied to a first node, as shown in fig. 5, and the apparatus including: a sending module 52, configured to send a relevant signal and/or channel in a downlink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

Fig. 6 is a block diagram (1) of a hierarchical beam access apparatus according to an embodiment of the present invention, which is applied to a first node, and as shown in fig. 6, the apparatus includes: an indicating module 62, configured to indicate at least two levels of beam groups for selecting uplink transmission beams, where a beam group is formed by one or more beams.

Fig. 7 is a block diagram (2) of a hierarchical beam access apparatus according to an embodiment of the present invention, which is applied to a second node, as shown in fig. 7, and includes: a sending module 72, configured to send a relevant signal and/or channel in an uplink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

Fig. 8 is a block diagram (3) of a hierarchical beam access apparatus according to an embodiment of the present invention, which is applied to a second node, as shown in fig. 8, and includes: a detecting module 82, configured to detect that the first node transmits a relevant signal and/or channel in a downlink access process by using at least two levels of beam groups, where the beam group is formed by one or more beams.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: all the modules are positioned in the same processor; alternatively, the modules are located in the first processor, the second processor, and the third processor …, respectively.

Since the second node needs to detect multiple optimal beams, it needs to detect multiple beam signals, and similarly, the first node needs to send synchronization signals of multiple different beams, so that the second node can detect the optimal beam index. In the access process, a hierarchical beam form can be applied, so that the second node and the first node side can obtain an optimal access beam through the access process. In addition, since the first node and the second node both transmit access signals during the initial access process and the control signaling transmitted afterwards is channel-based, since the identification signal-to-noise ratio of the access signals is lower than that of the control channel, the hierarchical beam form can provide different signal-to-noise ratios for the channels and signals, thereby providing a more reliable and faster access process.

The present optional embodiment provides a method and a system for hierarchical beam access, where a first node side transmits a related signal and/or channel in a downlink access process by using at least two stages of beam groups. Wherein, the related signals and/or channels in the downlink access process at least comprise one of the following signals and/or channels:

1. for identifying the signals and/or channels of the downlink transmit beams.

2. And the downlink access response signal or the channel is used for responding to the uplink access signal and/or the channel.

3. And the indication channel is used for responding to the uplink access configuration information.

There is a correlation between at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

The beam group is formed of one or more beams.

Optionally, a low-level beam group is a combination of one or more high-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

The first node transmits a channel and/or a signal with beam characteristics by using a first primary downlink transmission beam group, wherein the channel and/or signal information is used for at least one of identification, synchronization, access configuration information indication and system configuration information notification of a downlink transmission beam, and the first primary downlink transmission beam group comprises at least one first primary downlink beam.

Optionally, the indication access configuration information includes at least one of time-frequency code resources of the first primary uplink transmission beam group, and transmission power indication information of an uplink access signal and/or a channel.

The first node needs to receive an uplink access signal and/or a channel sent by the second node by using the first primary uplink transmission beam group at a predefined or configured uplink transmission time, and the first node obtains a beam index corresponding to a beam in the second primary downlink transmission beam group in the uplink access signal and/or the channel.

Optionally, the second-level downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first-level downlink transmission beam group.

Optionally, the optimal selection principle may be one of optimal quality, minimum interference, or optimal quality with minimum power overhead.

Optionally, the first node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second primary downlink transmission beam group, and transmits the uplink access channel and/or the signal response information by using the first secondary downlink transmission beam group.

Optionally, the uplink access channel and/or the signal response information carries a beam index corresponding to a beam in the second-stage uplink transmission beam group.

Optionally, the beam corresponding to the beam in the second-stage uplink transmission beam group is an optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal.

Optionally, the first node receives, on a predefined or preconfigured time-frequency resource, that the second node transmits uplink access configuration information and/or measurement reference signals using the first secondary uplink transmission beam group, where the access configuration information includes an uplink access MAC layer message.

Optionally, the first node predefines the first secondary uplink transmission beam group as one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

Optionally, the access configuration information includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

Optionally, the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detecting the first secondary downlink transmission beam group according to a predefined or preconfigured principle. (right 14)

Optionally, the first node sends an uplink access configuration information response instruction by using the third secondary downlink transmission beam group, where the uplink access configuration information response instruction carries a beam index corresponding to a beam in the second secondary uplink transmission beam group.

Optionally, the first node selects an optimal one or more downlink transmission beams for forming the low third-level downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second-level downlink transmission beam group.

Optionally, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting uplink access configuration information and/or measurement reference signals.

Optionally, the first node performs initial control signaling and/or data interaction with the second node by using the third-level downlink transmission beam group.

The present optional embodiment provides a method and a system for hierarchical beam access, where a second node side transmits a related signal and/or channel in an uplink access process by using at least two stages of beam groups. Wherein, the related signals and/or channels in the uplink access process at least comprise one of the following signals and/or channels:

1. for identifying the signals and/or channels of the uplink transmit beam.

2. Signals and/or channels for uplink access.

3. And uplink access configuration information.

There is a correlation between the at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

The beam group is formed of one or more beams.

A low-level beam group is a combination of one or more high-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

The second node detects, on a predefined or configured time-frequency code resource, a channel and/or a signal with beam characteristics, which is sent by the first node using a first primary downlink transmission beam group, where the channel and/or signal information is used for at least one of identification, synchronization, indication of access configuration information, and notification of system configuration information of a downlink transmission beam, and the first primary downlink transmission beam group includes at least one first primary downlink beam.

And the second node detects at least one of time-frequency code resources of the first primary uplink transmission beam group, uplink access signals and/or transmission power indication information of a channel in the indication access configuration information.

And the second node transmits uplink access signals and/or channels by utilizing the first primary uplink transmission beam group in predefined or configured uplink transmission time-frequency code resources, and the uplink access signals and/or channels comprise beam indexes corresponding to beams in the second primary downlink transmission beam group.

The second-level downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first-level downlink transmission beam group.

Optionally, the optimal selection principle may be one of optimal quality, minimum interference, or optimal quality with minimum power overhead.

The second node considers that the first node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second primary downlink transmission beam group, and receives uplink access channel and/or signal response information sent by the first node by using the first secondary downlink transmission beam group on a predefined or preconfigured resource.

Optionally, the second node obtains a beam index corresponding to a beam in the second-level uplink transmission beam group from the uplink access channel and/or the signal response information.

Optionally, the second node considers a beam corresponding to a beam in the second-level uplink transmission beam group as an optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal.

Optionally, the second node transmits uplink access configuration information and/or measurement reference signals by using the first secondary uplink transmission beam group on a predefined or preconfigured time-frequency resource, where the access configuration information includes an uplink access MAC layer message.

Optionally, the first secondary uplink transmission beam group is one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

Optionally, the access configuration information includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

Optionally, the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detecting the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

Optionally, the second node receives, on a predefined or preconfigured time-frequency code resource, an uplink access configuration information response indication sent by the first node by using the third secondary downlink transmission beam group, and obtains, in the uplink access configuration information response indication, a beam index corresponding to a beam in the second secondary uplink transmission beam group.

Optionally, the second node predefines the first node to select an optimal one or more downlink transmission beams for forming the low third-level downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second-level downlink transmission beam group.

Optionally, the beam corresponding to the beam in the second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting uplink access configuration information and/or measurement reference signals.

Optionally, the second node selects an optimal second-level uplink transmission beam group according to the received second-level uplink transmission beam group index and according to a predefined or preconfigured principle, and performs initial control signaling and/or data interaction by using the third-level uplink transmission beam group and the first node.

In practical system application, the concept of the beam means that the beam can reduce the leakage of the signal power of the first node in other directions, the centralized characteristic of the signal power is ensured, the coverage areas of the first node and the second node are improved, and the uplink beam can reduce the power consumption of the second node.

In this optional embodiment, the beam index may be a direct beam index or indirect beam index related information, and only through this information, the first node and the second node may learn the corresponding beam information or recognize that the beams are all within the range of the beam index expression information.

Example 1:

fig. 9 is a schematic diagram of a two-stage beam group access training process according to an embodiment of the present invention, and as shown in fig. 9, a first node transmits a channel and/or a signal with beam characteristics by using a first one-stage downlink transmission beam group, where the channel and/or signal information is used for at least one of identification, synchronization, access configuration information indication, and system configuration information notification of a downlink transmission beam, and the first one-stage downlink transmission beam group includes at least one first one-stage downlink beam. The indication access configuration information includes at least one of time-frequency code resources of the first primary uplink transmission beam group, and transmission power indication information of an uplink access signal and/or a channel.

The second node detects, on predefined or configured time-frequency code resources, channels and/or signals with beam characteristics transmitted by the first node using the first primary downlink transmission beam group.

And the second node detects at least one of time-frequency code resources of the first primary uplink transmission beam group, uplink access signals and/or transmission power indication information of a channel in the indication access configuration information.

And the second node transmits uplink access signals and/or channels by utilizing the first primary uplink transmission beam group in predefined or configured uplink transmission time-frequency code resources, and the uplink access signals and/or channels comprise beam indexes corresponding to beams in the second primary downlink transmission beam group.

The second-level downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first-level downlink transmission beam group.

Optionally, the optimal selection principle may be one of optimal quality, minimum interference, or optimal quality with minimum power overhead.

The first node receives an uplink access signal and/or channel sent by the second node by using the first primary uplink transmission beam group on a predefined or configured uplink transmission resource, and obtains a beam index corresponding to a beam in the second primary downlink transmission beam group in the uplink access signal and/or channel.

And the first node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second primary downlink transmission beam group, and transmits the uplink access channel and/or the signal response information by using the first secondary downlink transmission beam group.

Optionally, the uplink access channel and/or the signal response information carries a beam index corresponding to a beam in the second-stage uplink transmission beam group. The beam corresponding to the beam in the second-level uplink transmission beam group is the optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting an uplink access channel and/or signal.

And the second node receives the uplink access channel and/or signal response information transmitted by the first node by utilizing the first secondary downlink transmission beam group on the predefined or preconfigured resource. And the second node obtains the beam index corresponding to the beam in the second-level uplink transmission beam group from the uplink access channel and/or the signal response information.

And the second node transmits uplink access configuration information and/or a measurement reference signal by utilizing the first secondary uplink transmission beam group on a predefined or preconfigured time-frequency resource, wherein the access configuration information comprises an uplink access MAC layer message.

The first secondary uplink transmission beam group is one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

The access configuration information includes a beam index corresponding to a beam in the second-level downlink transmission beam group. The second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

The first node receives uplink access configuration information and/or a measurement reference signal transmitted by the second node by using the first secondary uplink transmission beam group on a predefined or preconfigured time frequency resource, and obtains a beam index corresponding to a beam in the second secondary downlink transmission beam group from the configuration information and/or the measurement reference signal.

And the first node selects one or more optimal downlink transmission beams for forming a third secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second secondary downlink transmission beam group.

And the first node sends an uplink access configuration information response instruction by using the third secondary downlink sending beam group, wherein the uplink access configuration information response instruction carries a beam index corresponding to the beam in the second secondary uplink sending beam group.

The beam corresponding to the beam in the second-level uplink transmission beam group is the optimal uplink transmission beam selected by the first node side according to a predefined or preconfigured principle by detecting uplink access configuration information and/or measurement reference signals.

And the second node receives the uplink access configuration information response indication sent by the first node by using the third secondary downlink sending beam group on the predefined or preconfigured time frequency code resource, and obtains the beam index corresponding to the beam in the second secondary uplink sending beam group in the uplink access configuration information response indication.

And the second node selects an optimal third-level uplink transmission beam group according to the received second-level uplink transmission beam group index and a predefined or preconfigured principle, and performs initial control signaling and/or data interaction by using the third-level uplink transmission beam group and the first node.

And the first node performs initial control signaling and/or data interaction with the second node by utilizing the third-level downlink transmission beam group.

Example 2:

the first node transmits at least one of the following signals and channels on the carrier using N downlink transmit beams: synchronization signals, downlink discovery signals, downlink system information, and uplink access configuration information. The N beams may satisfy the above channel primary first node coverage area requirements. Wherein the discovery signal is used to indicate that the second node corresponds to a transmission beam employed by the first node on the resource.

The N downlink beams form a first primary downlink transmit beam group.

Alternatively, the synchronization signal may be used to indicate to the second node the transmission beam employed by the first node on the corresponding resource, in which case the first node is not required to additionally transmit the discovery signal.

Optionally, the downlink system information may indicate that the second node corresponds to the downlink transmission beam used by the first node on the resource, and at this time, the first node does not need to additionally transmit the discovery signal.

The second node detects the signal and/or channel transmitted by the first node on a plurality of resources. The second node needs to select S0(S0>0, S0< N +1) optimal downlink transmission beams according to a predefined or preconfigured principle, and the corresponding downlink optimal transmission beams form a second-level downlink transmission beam group, and obtain an index corresponding to each downlink optimal transmission beam in the second-level downlink transmission beam group according to predefined or higher-level signaling configuration information.

When detecting a corresponding beam signal or a beam channel, the second node needs to determine, according to received control information, a time-frequency code position for transmitting an uplink access signal and/or a channel, and transmits the uplink access signal and/or the channel at a corresponding resource position by using the first primary uplink transmission beam group, and the access signal needs to carry a beam index indication corresponding to each downlink optimal transmission beam in the second primary downlink transmission beam group. The beam index indication corresponding to the downlink optimal transmission beam is used for indicating the first node side, and the second node recommends the optimal downlink transmission beam according to the measurement result.

The first node receives uplink access signals and/or channels sent by the second nodes at predefined or configured time-frequency code resource positions, detects code sequences of the uplink access signals and/or channels of the second nodes, and obtains indexes corresponding to downlink optimal sending beams in a second-level downlink sending beam group fed back by the second nodes from the corresponding uplink access signals and/or channels. So that the first node can obtain the S0 optimal downlink transmission beams recommended by the second node.

The first node further selects a second-stage downlink transmission beam from the S0 optimal downlink transmission beams according to a predefined or configured rule.

When the value of S0 is 1 and the corresponding beam Index is Index0, the first node may determine the number of secondary beams (sub-beams) included in the corresponding beam Index0, for example: the beam 0 includes X secondary beams (sub-beams), and a space formed by the X secondary beams (sub-beams) is a space covered by the beam 0. At this time, the first node may select Y ((Y >0, Y < X +1)) from the X secondary beams to form a first secondary downlink transmit beam group.

When the value of S0 is 2, and the corresponding beam indexes are Index0 and Index1, the number of secondary beams included in a beam corresponding to Index0 is X0, the number of secondary beams included in a beam corresponding to Index1 is X1, the first node selects Y0 from X0 secondary beams, and selects Y1 from X1 secondary beams, and the Y0+ Y1 beams form a first secondary downlink transmission beam group.

When the value of S0 is Z, and the corresponding beam indexes are Index0 to Index (Z-1), the numbers of secondary beams included in the beams corresponding to Index0 to Index (Z-1) are X0 to X (Z-1), respectively, Y0 first nodes are selected from X0 secondary beams, Y1 first nodes are selected from X1 secondary beams, and so on, Y (Z-1) second nodes are selected from X (Z-1) secondary beams,the beams form a first secondary downlink transmit beam group.

The first node transmits random access response information using a plurality of beams in the first secondary transmit beam group on a predefined or configured time-frequency code resource.

The first node selects an optimal uplink transmission beam corresponding to one or more random access response signals and/or channels from a plurality of random access response signals and/or channels carried by a first primary uplink transmission beam transmitted by the second node through a predefined or configured rule by receiving a random access response signal of the second node, and forms a second primary uplink transmission beam group by the selected uplink transmission beams.

The first node needs to send the random access response information on the predefined or configured resource, and the random access response information and the indexes of all beams in the second-level uplink transmission beam group are received and detected by the second node on the corresponding resource.

The second node needs to receive the access response message and determine whether the response message is in response to the second node random access signal and/or channel. The second node needs to obtain the index of each beam in the second-level uplink transmission beam group from the access response information. Therefore, the second node can obtain the optimal uplink transmission beam recommended by the first node.

The second node further selects a first secondary uplink transmission beam from the a0 optimal uplink transmission beams according to a predefined or configured rule.

When the value of a0 is 1 and the corresponding beam Index is Index0, the first node may determine the number of secondary beams (sub-beams) included in the corresponding beam Index0, for example: the beam 0 includes X secondary beams (sub-beams), and a space formed by the X secondary beams (sub-beams) is a space covered by the beam 0. At this time, the first node may select Y ((Y >0, Y < X +1)) from the X secondary beams to form a first secondary upstream transmit beam group.

When the value of a0 is 2, and the corresponding beam indexes are Index0 and Index1, the number of secondary beams included in a beam corresponding to Index0 is X0, the number of secondary beams included in a beam corresponding to Index1 is X1, the first node selects Y0 from X0 secondary beams, selects Y1 from X1 secondary beams, and the Y0+ Y1 beams form a first secondary uplink transmission beam group.

When the value of A0 is B, the corresponding beam indexes are Index0 to Index (B-1), the numbers of secondary beams included in the beams corresponding to Index0 to Index (B-1) are X0 to X (B-1), respectively, Y0 first nodes are selected from X0 secondary beams, Y1 first nodes are selected from X1 secondary beams, and so on, Y (B-1) second nodes are selected from X (B-1) secondary beams,the beams form a first secondary uplink transmit beam group.

The second node selects an optimal downlink transmission beam or a plurality of optimal downlink transmission beams from each beam in the first secondary downlink transmission beam group according to a predefined or configured rule by detecting access response information transmitted by the first node side by using the first secondary downlink transmission beam group, and forms the corresponding beams into a second secondary downlink transmission beam group.

And the second node transmits uplink access configuration information by utilizing the first secondary uplink transmission beam on the predefined or configured resource, wherein the uplink access configuration information is used for informing the first node, and the second node has received the random access response information of the first node.

Optionally, the uplink access configuration information may include some contention resolution related information.

The uplink access configuration information includes beam index information corresponding to beams in the second-level downlink transmission beam group.

The first node receives uplink access configuration information sent by the second node on predefined or configured resources, and selects one or more optimal uplink transmission beams according to a predefined or configured principle from a plurality of uplink access configuration information sent by using the first secondary uplink transmission beams, and the one or more optimal uplink transmission beams form a second secondary uplink transmission beam.

The first node obtains the beam index information in the second level downlink sending beam group from the uplink access configuration information.

The first node further selects a third secondary downlink transmission beam from the S0 second secondary downlink transmission beams according to a predefined or configured rule.

When the value of S0 is 1 and the corresponding beam Index is Index0, the first node may determine the number of secondary beams (sub-beams) included in the corresponding beam Index0, for example: the beam 0 includes X secondary beams (sub-beams), and a space formed by the X secondary beams (sub-beams) is a space covered by the beam 0. At this time, the first node may select Y ((Y >0, Y < X +1)) from the X secondary beams to form a third secondary downlink transmit beam group.

When the value of S0 is 2, and the corresponding beam indexes are Index0 and Index1, the number of secondary beams included in a beam corresponding to Index0 is X0, the number of secondary beams included in a beam corresponding to Index1 is X1, the first node selects Y0 from X0 secondary beams, and selects Y1 from X1 secondary beams, and the Y0+ Y1 beams form a third secondary downlink transmission beam group.

When the value of S0 is Z, and the corresponding beam indexes are Index0 to Index (Z-1), the numbers of secondary beams included in the beams corresponding to Index0 to Index (Z-1) are X0 to X (Z-1), respectively, Y0 first nodes are selected from X0 secondary beams, Y1 first nodes are selected from X1 secondary beams, and so on, Y (Z-1) second nodes are selected from X (Z-1) secondary beams,the beams form a third secondary downlink transmit beam group.

And the first node transmits access configuration information response information by using the third secondary downlink transmission beam group, and the access configuration information response information is used for responding to the access configuration response information of the second node.

Optionally, the response information may include contention resolution related control information.

Optionally, the response information includes index information of each beam in the second-level uplink transmission beam group. The second-level uplink transmission beam group is an optimal uplink transmission beam selected by the first node according to a predefined or configured rule by detecting access configuration information or a measurement reference signal of the second node.

The second node detects access configuration information response information sent by the first node on predefined or configured time frequency code resources, and detects a second-level uplink sending wave beam in the response information.

And the second node selects the optimal uplink transmission beam according to the detected second-level uplink transmission beam and a predefined or configured principle, forms the selected optimal uplink transmission beam into a third-level uplink transmission beam group, and performs initial data and/or control signaling interaction with the first node by using the third-level uplink transmission beam group.

And the first node performs initial data and/or control signaling interaction with the second node by using the third-level downlink transmission beam group.

Example 3:

in embodiments 1 and 2, when feeding back index information of each beam in the second primary downlink transmission beam group, the second node may carry quality indication information or related priority information corresponding to each beam in the second primary downlink transmission beam group, so as to indicate channel quality information and/or priority information corresponding to each beam in the second primary downlink beam of the first node. The first node may select an optimal one or more downlink transmission beams to form a first secondary downlink transmission beam group according to the corresponding quality information and/or priority information by using a predefined or configured principle.

In embodiment 1 and embodiment 2, when indicating, by the first node, each beam index information in the second-level uplink transmission beam group to the second node, the first node may carry quality indication information or related priority information corresponding to each beam in the second-level uplink transmission beam group, and is used to indicate, by the second node, channel quality information and/or priority information corresponding to each recommended beam in the second-level uplink transmission beam group. The second node may select an optimal one or more uplink transmission beams to form the first secondary uplink transmission beam group according to the corresponding quality information and/or priority information by using a predefined or configured principle.

In embodiments 1 and 2, when feeding back index information of each beam in the second-level downlink transmission beam group, the second node may carry quality indication information or related priority information corresponding to each beam in the second-level downlink transmission beam group, so as to indicate channel quality information and/or priority information corresponding to each beam in the second-level downlink beam of the first node. The first node may select an optimal one or more downlink transmission beams to form a third secondary downlink transmission beam group according to the corresponding quality information and/or priority information by using a predefined or configured principle.

In embodiments 1 and 2, when indicating each beam index information in the second-level uplink transmission beam group of the second node, the first node may carry quality indication information or related priority information corresponding to each beam in the second-level uplink transmission beam group, and is used to indicate channel quality information and/or priority information corresponding to each beam in the recommended second-level uplink transmission beam group, to the second node. The second node may select an optimal one or more uplink transmission beams to form a third secondary uplink transmission beam group according to the corresponding quality information and/or priority information by using a predefined or configured principle.

Example 4:

optionally, as in the method and the process in embodiments 1 and 2, when the second node needs to send a beam in the first secondary uplink transmission group, and the first node needs to select a second secondary uplink transmission group that needs to be indicated to the second node according to the first secondary uplink transmission group sent by the second node, the second node may send a measurement reference signal by using the first secondary uplink transmission beam group, and the first node selects the second secondary uplink transmission beam group by measuring the reference signal sent by using the first secondary uplink transmission beam group, and feeds back index information corresponding to each beam in the second secondary uplink transmission beam group to the second node.

In summary, the hierarchical beam form of the present invention can provide different signal-to-noise ratios for channels and signals, thereby providing a more reliable and fast access procedure

In another embodiment, a software is provided, which is used to execute the technical solutions described in the above embodiments and preferred embodiments.

In another embodiment, a storage medium is provided, in which the software is stored, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (54)

1. A hierarchical beam access method, comprising:

the first node transmits related signals and/or channels in a downlink access process by utilizing at least two stages of beam groups, wherein the beam group is composed of one or more beams.

2. The method according to claim 1, wherein the related signals and/or channels in the downlink access procedure include at least one of the following signals and/or channels:

signals and/or channels for identifying downlink transmit beams;

a downlink access response signal and/or channel for responding to the uplink access signal and/or channel;

and the indication signal and/or the channel are used for responding to the uplink access configuration information.

3. The method of claim 1, comprising:

the coverage space of a lower-level beam group of the at least two-level beam groups is a combined coverage space of one or more higher-level beam groups of the at least two-level beam groups; or,

the one low-level beam group includes the one or more high-level beam groups; or,

the coverage of said one low-level beam group consists of one or more high-level beam group coverage; or,

the space of one or more high-level beam groups is covered by one low-level beam group.

4. The method according to claim 1, wherein the first node transmits the relevant signals and/or channels in the downlink access process by using at least two stages of beam groups comprises:

the first node transmits channels and/or signals with beam characteristics by utilizing a first primary downlink transmission beam group;

wherein the channel and/or signal information is used to indicate information of at least one of: identifying downlink transmission beams, synchronizing the downlink transmission beams, indicating access configuration information and informing system configuration information; the indication access configuration information comprises information of at least one of the following: the first primary downlink transmission beam group includes at least one first primary downlink beam.

5. The method of claim 1, comprising:

the first node receives an uplink access signal and/or a channel sent by a second node at a predefined or configured uplink sending moment;

and the first node acquires a beam index corresponding to a beam in a second-level downlink transmission beam group through the uplink access signal and/or the channel.

6. The method of claim 5, comprising:

and the first node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the second primary downlink transmission beam group, and transmits response information of the uplink access channel and/or signal by using the first secondary downlink transmission beam group.

7. The method of claim 6, comprising:

the first node receives uplink access configuration information and/or a measurement reference signal sent by the second node on a predefined or preconfigured time frequency resource, wherein the uplink access configuration information comprises an uplink access Media Access Control (MAC) layer message.

8. The method of claim 7, wherein the uplink access configuration information further includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

9. The method of claim 8, wherein the second secondary downlink transmit beam group is one or more optimal downlink beams obtained by the second node by detecting the first secondary downlink transmit beam group according to a predefined or preconfigured principle.

10. The method of claim 9, wherein the first node selects an optimal one or more downlink transmission beams for forming a third secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second secondary downlink transmission beam group.

11. The method of claim 10, wherein the first node transmits the uplink access configuration information response indication using the third secondary downlink transmit beam group.

12. The method of claim 11, wherein the first node and the second node exchange information through the wave array, comprising:

and the first node performs initial control signaling and/or data interaction with the second node by using the third-level downlink transmission beam group.

13. The method of claim 5, wherein the second primary downlink transmission beam group is one or more optimal downlink beams obtained by the second node by detecting the first primary downlink transmission beam group.

14. The method of claim 13, wherein the downlink beam is determined as the optimal downlink beam by at least one of:

the downlink wave beam is the downlink wave beam with the optimal quality;

the downlink wave beam is the downlink wave beam with the minimum interference;

the downlink beam is the downlink beam with the minimum power overhead.

15. A hierarchical beam access method, comprising:

the first node indicates at least two levels of beam groups for selection of uplink transmit beams, the beam groups consisting of one or more beams.

16. The method of claim 15, comprising: the signals and/or channels indicating that the two-stage beam group carries relevant signals and/or channels in the downlink access process comprise one of the following signals and/or channels:

a downlink access response signal or channel for responding to the uplink access signal and/or channel;

an indication signal or channel for responding to the uplink access configuration information.

17. The method of claim 15, comprising:

the coverage space of a lower-level beam group is the combined coverage space of one or more higher-level beam groups in the at least two-level beam groups; or,

the one low-level beam group includes the one or more high-level beam groups; or,

the coverage of said one low-level beam group consists of one or more high-level beam group coverage; or,

the space of one or more high-level beam groups is covered by one low-level beam group.

18. The method of claim 15, comprising:

the first node transmits a channel and/or signal having beam characteristics, the channel and/or signal information indicating information of at least one of: synchronizing, indicating access configuration information and informing system configuration information; the indication access configuration information comprises information of at least one of the following: and the time-frequency code resource of the first primary uplink transmission beam group, and the transmission power indication information of the uplink access signal and/or the channel.

19. The method of claim 15, comprising:

and the first node receives an uplink access signal and/or a channel transmitted by the second node by using the first primary uplink transmission beam group at a predefined or configured uplink transmission moment.

20. The method of claim 15, comprising:

and the first node sends uplink access channel and/or signal response information to the second node, and the uplink access channel and/or signal response information carries a beam index corresponding to a beam in the second-level uplink sending beam group.

21. The method of claim 20, comprising:

and the beam corresponding to the beam in the second-level uplink transmission beam group is the optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal.

22. The method of claim 20, comprising:

the first node receives uplink access configuration information and/or a measurement reference signal sent by a second node by utilizing a first secondary uplink sending beam group on a predefined or preconfigured time frequency resource, wherein the access configuration information comprises an uplink access Media Access Control (MAC) layer message.

23. The method of claim 20, comprising:

the first node predefines a first secondary uplink transmission beam group as one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

24. The method of claim 15, comprising:

and the first node sends an uplink access configuration information response instruction, wherein the uplink access configuration information response instruction carries a beam index corresponding to a beam in the second-level uplink sending beam group.

25. The method of claim 24, comprising:

the beam corresponding to the beam in the second secondary uplink transmission beam group is the optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or a measurement reference signal.

26. The method of claim 15, comprising:

and the first node and the second node carry out the interaction of initial control signaling and/or data.

27. A hierarchical beam access method, comprising:

and the second node transmits related signals and/or channels in the uplink access process by utilizing at least two stages of beam groups, wherein the beam group consists of one or more beams.

28. The method of claim 27, comprising:

the related signals and/or channels in the uplink access process include at least one of the following signals and/or channels:

signals and/or channels for identifying uplink transmission beams;

signals and/or channels for uplink access;

uplink access configuration signals and/or channels.

29. The method of claim 27, comprising:

there is a correlation between the at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

30. The method of claim 29, comprising:

a low-level beam group is a combination of one or more high-level beam groups; alternatively, a low-level beam group comprises one or more high-level beam groups; alternatively, the coverage space or range of a low-level beam group consists of one or more high-level beam groups; alternatively, the space of one or more high-level beam groups is covered by one low-level beam group.

31. The method of claim 30, comprising:

and the second node transmits uplink access signals and/or channels by utilizing the first primary uplink transmission beam group at predefined or configured uplink transmission time-frequency code resources.

32. The method of claim 30, comprising:

and the second node transmits uplink access configuration information and/or a measurement reference signal by utilizing a first secondary uplink transmission beam group on a predefined or preconfigured time-frequency resource, wherein the access configuration information comprises an uplink access Media Access Control (MAC) layer message.

33. The method of claim 32, comprising:

the first secondary uplink transmission beam group is one or more optimal uplink transmission beams selected by the second node from the second primary uplink transmission beam group according to a predefined or preconfigured principle.

34. The method of claim 30, comprising:

and the second node selects an optimal third-level uplink transmission beam group according to the received second-level uplink transmission beam group index and a predefined or preconfigured principle, and performs initial control signaling and/or data interaction by using the third-level uplink transmission beam group and the first node.

35. A hierarchical beam access method, comprising:

the second node detects that the first node utilizes at least two stages of beam groups to send related signals and/or channels in the downlink access process, wherein the beam group is composed of one or more beams.

36. The method of claim 35, comprising:

the related signals and/or channels in the uplink access process include at least the following signals and/or channels:

signals and/or channels for identifying uplink transmission beams;

signals and/or channels for uplink access;

uplink access configuration signals and/or channels.

37. The method of claim 35, comprising:

there is a correlation between the at least two levels of beam groups, and one or more high level beam group characteristics may be obtained from lower level beam group characteristics.

38. The method of claim 37, comprising:

a low-level beam group is a combination of one or more high-level beam groups; or,

a low-level beam group comprising one or more high-level beam groups; or,

the coverage space or range of a low-level beam group is comprised of one or more high-level beam groups; or,

the space of one or more high-level beam groups is covered by one low-level beam group.

39. The method of claim 35, comprising:

the second node detects, on a predefined or configured time-frequency code resource, a channel and/or a signal with beam characteristics, which is sent by the first node using a first primary downlink transmission beam group, where the channel and/or signal information is used for at least one of identification, synchronization, indication of access configuration information, and notification of system configuration information of a downlink transmission beam, and the first primary downlink transmission beam group includes at least one first primary downlink beam.

40. The method of claim 35, comprising:

and the second node detects at least one of time-frequency code resources of the first primary uplink transmission beam group, uplink access signals and/or transmission power indication information of a channel in the indication access configuration information.

41. The method of claim 35, comprising:

the second-level downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first-level downlink transmission beam group.

42. The method of claim 41, comprising:

the optimal selection principle comprises at least one of the following:

optimal quality, minimal interference and minimal power overhead.

43. The method of claim 35, comprising:

and the second node selects a first secondary downlink transmission beam group according to a predefined or preconfigured principle by using the obtained second primary downlink transmission beam group according to the first node, and receives uplink access channel and/or signal response information sent by the first node by using the first secondary downlink transmission beam group on a predefined or preconfigured resource.

44. The method of claim 40, comprising:

and the second node obtains the beam index corresponding to the beam in the second-level uplink transmission beam group from the uplink access channel and/or the signal response information.

45. The method of claim 44, comprising:

and the second node selects the optimal uplink transmission beam for the first node according to a predefined or preconfigured principle by detecting an uplink access channel and/or a signal according to the beam corresponding to the beam in the second-level uplink transmission beam group.

46. The method of claim 35, comprising:

the access configuration information includes a beam index corresponding to a beam in the second-level downlink transmission beam group.

47. The method of claim 46, comprising:

the second secondary downlink transmission beam group is one or more optimal downlink beams obtained by the second node through detection of the first secondary downlink transmission beam group according to a predefined or preconfigured principle.

48. The method of claim 47, comprising:

and the second node receives an uplink access configuration information response indication sent by the first node by using a third secondary downlink sending beam group on a predefined or preconfigured time-frequency code resource, and obtains a beam index corresponding to a beam in the second secondary uplink sending beam group in the uplink access configuration information response indication.

49. The method of claim 48, comprising:

and the second node predefines the first node and selects one or more optimal downlink transmission beams for forming a low third-level downlink transmission beam group by using the obtained second-level downlink transmission beam group according to a predefined or preconfigured principle.

50. The method of claim 49, comprising:

the beam corresponding to the beam in the second secondary uplink transmission beam group is the optimal uplink transmission beam selected by the first node according to a predefined or preconfigured principle by detecting uplink access configuration information and/or a measurement reference signal.

51. A hierarchical beam access apparatus, the apparatus being applied to a first node, comprising:

a sending module, configured to send a relevant signal and/or channel in a downlink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

52. A hierarchical beam access apparatus, the apparatus being applied to a first node, comprising:

the device comprises an indicating module, a receiving module and a transmitting module, wherein the indicating module is used for at least indicating two-stage beam groups to be used for selecting uplink transmitting beams, and the beam group is composed of one or more beams.

53. A hierarchical beam access apparatus, applied to a second node, comprising:

a sending module, configured to send a relevant signal and/or channel in an uplink access process by using at least two levels of beam groups, where a beam group is formed by one or more beams.

54. A hierarchical beam access apparatus, applied to a second node, comprising:

the first node sends a downlink access request to a first node, wherein the downlink access request comprises a downlink access request, and the first node sends a downlink access request to the first node.