KR101563469B1 - Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station - Google Patents

Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station Download PDF

Info

Publication number
KR101563469B1
KR101563469B1 KR1020150085736A KR20150085736A KR101563469B1 KR 101563469 B1 KR101563469 B1 KR 101563469B1 KR 1020150085736 A KR1020150085736 A KR 1020150085736A KR 20150085736 A KR20150085736 A KR 20150085736A KR 101563469 B1 KR101563469 B1 KR 101563469B1
Authority
KR
South Korea
Prior art keywords
base station
random access
message
downlink
mobile terminal
Prior art date
Application number
KR1020150085736A
Other languages
Korean (ko)
Inventor
조용수
신홍섭
Original Assignee
중앙대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 중앙대학교 산학협력단 filed Critical 중앙대학교 산학협력단
Priority to KR1020150085736A priority Critical patent/KR101563469B1/en
Application granted granted Critical
Publication of KR101563469B1 publication Critical patent/KR101563469B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

Landscapes

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

Abstract

A mobile terminal performing random access through switched beamforming, a control method thereof, and a control method of a base station are disclosed. A control method for a mobile terminal that performs random access, the method comprising: (a) receiving a downlink synchronization signal from a base station transmitted using beam steering using beam sweep; (B) determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal; And (c) transmitting a first message including the random access preamble and the downlink transmission beam ID of the base station to the base station using beam steering.

Description

[0001] The present invention relates to a mobile terminal performing random access through switched beamforming, a control method thereof, and a control method of a base station,

Embodiments of the present invention can reduce the complexity and random access time required for performing random access through switched beamforming, reduce the waste of channel resources and reduce power consumption, And a control method of a base station communicating with the mobile terminal.

The millimeter wave signal experiences high path loss and has high linearity with short wavelength. Accordingly, a directional beamforming technique that can effectively utilize the LOS (Line of Sight) component is mainly used for millimeter wave signals. However, because of the complexity of hardware, analog beamforming technology with relatively low complexity than digital beamforming technology is currently used.

The millimeter wave signal has a shorter wavelength, so it can be transmitted through a small array antenna. In this case, a very large gain can be obtained when the beam on the transmission side and the beam on the reception side are aligned so as to maximize the SNR (Signal to Noise Ratio). However, there is a disadvantage in that communication can not be performed if accurate beam alignment is not performed. Therefore, in order to accurately align the beams, the transmitting and receiving ends perform a beam training process.

The beam training process is a process of switching all the transmission beams at the transmitting end and transmitting a training signal (beam steering), and a process (beam sweeping) of switching and receiving all the receiving beams for each transmission beam. Thereafter, the transmitting and receiving beam pairs that maximize the received power are searched, and the receiving end feeds back the optimum transmitting beam to the transmitting end. The beam training process is completed by performing this process on both the uplink and the downlink.

On the other hand, since the random access signal is transmitted from an arbitrary mobile terminal existing in the cell, it is most efficient to receive the random access signal using an omni antenna capable of receiving signals from all directions.

However, in the case of switched beamforming in which signals are received in a predetermined direction, transmission and reception of signals using omni-directional antennas are disadvantageous in that they are difficult to implement due to problems such as link budget and beam pattern formation. In particular, there is a very large path loss in the millimeter wave band, and in a wide area as in a cellular system, it is necessary to form a beam at the receiving end to receive a signal.

Generally, since the random access is performed in a situation in which beam training is not performed, that is, in a situation where an optimal transmission / reception beam for communication is not confirmed, in order to perform random access, a conventional mobile station and a base station, Steering and beam sweeping must be performed to communicate.

At this time, during the random access process, a beam training process for finding a pair of optimal beams on the transmission side and a reception side, a confirmation of the mobile station accompanied by the random access, and other message exchange functions must be performed simultaneously. There is a disadvantage that the complexity is greatly increased as compared with the case of using an antenna.

That is, when the existing random access scheme is directly applied to the switched beamforming system, the time required for initial cell setup and the time required for establishing a new link at the time of handover are greatly increased. In addition, there is a disadvantage that the channel resource is wasted and the power consumption of the mobile terminal is increased.

In order to solve the problems of the prior art as described above, the present invention reduces the complexity and random access time required for performing random access through switched beamforming, reduces the waste of channel resources, A control method thereof, and a control method of a base station communicating with the mobile terminal.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

According to another aspect of the present invention, there is provided a method of controlling a mobile station performing random access, the method comprising: receiving a downlink synchronization signal from a base station transmitted using beam steering, (A); (B) determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal; And a step (c) of transmitting a first message including a random access preamble and a downlink transmission beam ID of the base station to the base station using beam steering, do.

Wherein the step (c) comprises: transmitting the first message through one of the plurality of PRACH resources, wherein the plurality of PRACH resources are allocated to a plurality of PRACH subframes and a frequency belonging to each of the plurality of PRACH subframes Lt; / RTI >

Wherein the step (c) comprises: determining an ID of the random access preamble and the one of the PRACH resources based on a downlink transmission beam ID of the base station, The subframe ID and the frequency ID of the resource, and the ID of the random access preamble.

The base station can receive the first message using beam sweeping and determine the uplink reception beam ID of the base station and the uplink transmission beam ID of the mobile station using the reception strength of the first message.

(D) receiving, from the base station via a PDCCH, a second message including a random access response corresponding to the random access preamble and an uplink transmission beam ID of the mobile terminal, Wherein in step (d), the mobile terminal can search for and receive the second message through a response window without performing beam sweeping.

If it is possible to transmit only one message in the subframe of the PDCCH, the BS transmits the second message using beam steering, and if it can transmit a plurality of messages in the subframe of the PDCCH, Can transmit the second message to the transmission beam according to the downlink transmission beam ID without performing beam steering.

According to another embodiment of the present invention, there is provided a control method of a base station performing random access, the method comprising: (a) transmitting a downlink synchronization signal to a mobile terminal using beam steering; And (b) receiving a first message including a random access preamble and a downlink transmission beam ID of a base station from the mobile station using beam sweeping, the mobile station comprising: Determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile terminal using the reception strength of the downlink synchronization signal; Is transmitted to the base station.

According to another embodiment of the present invention, there is provided a mobile terminal performing random access, the mobile terminal comprising: a receiver for receiving a downlink synchronization signal from a base station transmitted using beam steering using beam sweep; A determination unit for determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal; And a transmitter for transmitting a first message including a random access preamble and a downlink transmission beam ID of the base station to the base station using beam steering.

According to the present invention, there is an advantage that it is possible to reduce the complexity of random access performed through switched beamforming, reduce the time required for random access, reduce the waste of channel resources, and reduce power consumption.

1 is a diagram schematically illustrating the flow of a random access procedure in a conventional LTE.
2 is a flowchart illustrating a random access procedure in a switched beamforming system of the conventional LTE standard.
3 is a diagram showing an example of beam steering and beam sweeping in a random access procedure in a conventional switched beam forming.
FIG. 4 illustrates a process of performing random access through switched beamforming according to an embodiment of the present invention. Referring to FIG.
5 is a view showing an example of RAR reception window size and corresponding RAR reception when beam steering is performed for RAR transmission according to an embodiment of the present invention.
6 is a diagram illustrating three cases of transmitting RARs according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms "first "," second ", and the like can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the present specification, a random access procedure according to the prior art will be described first, and embodiments of the present invention will be described focusing on differences.

1 is a diagram schematically illustrating the flow of a random access procedure in a conventional LTE.

The random access procedure proceeds in such a manner that establishment of the uplink occurs after establishment of the downlink is established. For establishing the downlink, the mobile terminal preferentially acquires the cell ID of the base station and the frame synchronization of the downlink. For example, the LTE system acquires the cell ID of the base station and the frame synchronization of the downlink through two synchronization signals, PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

The random access procedure will be described in detail as follows.

In step 110, the mobile station transmits a random access preamble (RAP) or random access preamble sequence (RAPS) (hereinafter referred to as "PARS") through a Physical RA CHannel (PRACH) A random access preamble randomly selected from among the random access preambles. At this time, the base station searches and receives RAPS transmitted from all mobile terminals in the cell.

 In the LTE system, there are 10 subframes for every frame, 6 frequencies for every subframe, 60 PRACH resources in total, and the mobile station can transmit a random access preamble through one of these PRACH resources.

In step 120, the base station transmits a random access response (RAR: RA Response) which is a response of the RAPS (hereinafter referred to as "RAR").

That is, since the base station does not know the information about the mobile terminal that has transmitted the RAPS, the RAR includes an index of the received RAPS and an RA-RNTI (Radio Network Temporary Identifier) indicating a sub- (The sub-frame index and the frequency index of the PRACH correspond to the RA-RNTI one-to-one), time advance information for uplink synchronization, and resource for performing step 130, and the like.

At this time, since the RAR is transmitted through the PDCCH (Physical Downlink Control CHannel), which is a common channel, all mobile terminals within the cell can receive the RAR.

In addition, the mobile station receiving the RAR can check whether the RAPS transmitted by itself is received through the subframe index and the frequency index indicated by the RA-RNTI in the RAR. That is, when the received RAR uses the same subframe index and frequency index as the information in the RA-RNTI, the mobile terminal assumes that the received RAR is transmitted to itself.

Subsequently, in step 130, the mobile station transmits its own ID through the resource allocated through the RAR. In step 140, the BS confirms that the corresponding mobile station is a mobile terminal performing random access using the ID of the mobile station transmitted in step 130.

That is, in a random access procedure, since all mobile terminals in a cell randomly transmit RAPS, there is a possibility that there is always a possibility of collision, that is, there is a possibility that two or more mobile terminals transmit the same RAPS. Thus, steps 130 and 140 are for preventing collision between random accesses.

Meanwhile, the random access-related variables mentioned in the random access are obtained through the SIB at the beginning of cell entry, and the meanings of the variables are summarized in Table 1.

ra-PreambleIndex Variable that indicates the index ( p id ) of the RAPS. ra-PRACH-MaskIndex The sub-frame index ( s id , 0 s id <9) and the frequency index ( f id , 0 f id &Lt; 5) RA-RNTI Variables indicated by the time and frequency index of PRACH numberOfRA-Preambles A variable (one of {4, 8, 12, 16, ..., 60, 64}) indicating the number of RAPS available in a cell ra-ResponseWindowSize A positive integer (usually 2 to 3) indicating the interval in which the RAR is searched after the mobile terminal attempts random access, in units of subframes.

The random access is performed for initial cell setup, RLF (Radio Link Failure) or establishment of an uplink in a handover situation. The mobile station uses the variable to generate a PRACH resource ( p id , s id , f id ) is arbitrarily selected. At this time, the base station does not know about the variable. However, in a situation where the delay due to random access needs to be minimized (handover or delay sensitive service), the base station and the mobile terminal may omit step 130 and step 140 using a predetermined p id have.

2 is a flowchart illustrating a random access procedure in a switched beamforming system of the conventional LTE standard.

At this time, it is assumed that a general situation in which the uplink channel reciprocity is not established in the switched beamforming system of the LTE standard. In addition, it is assumed that the beam ID is not included in the message of the random access procedure of the existing LTE standard, but the feedback message for the beam ID required in the switched beamforming system is included in FIG. 2.

In step 210, the base station transmits the downlink synchronization signal using beam steering. At this time, the mobile station receives the downlink synchronization signal using beam sweeping. Then, the mobile station determines the optimal downlink transmission beam ID of the base station and the optimal downlink reception beam ID of the mobile station using the reception intensity of the downlink synchronization signal.

In step 220, the mobile terminal transmits RAPS over the PRACH using beam steering. At this time, the mobile terminal transmits RAPS through the selected time and frequency resources. Also, the base station receives RAPS using beam sweeping.

In step 230, the base station transmits the RAR corresponding to the RAPS over the PDCCH or PDSCH using beam steering. At this time, the RAR may include the ID of the RAPS and the RA-RNTI. In addition, the mobile terminal receives the RAR using the optimal downlink receive beam ID determined in step 210. That is, in step 230, the mobile station does not perform beam sweeping.

In the random access procedure shown in FIG. 2 and the beam training process of the switched beamforming system, since the optimum transmission beam ID is fed back in a message form, it is necessary to allocate a channel resource to transmit the optimized transmission beam ID. ) And step 250 are performed.

However, the delay caused by beam steering is proportional to the increase in the number of antennas and seriously delays link establishment in the initial cell setup, RLF or handover situations. Therefore, there is a need to effectively perform the feedback process of the optimal transmission beam of FIG. 2 to minimize the delay of the entire random access.

3 is a diagram showing an example of beam steering and beam sweeping in the random access procedure in the conventional switched beam forming.

Generally, the random access procedure of the LTE system is performed frame by frame. That is, one mobile terminal can transmit only one random access within one frame. However, in order to reduce the delay, it is preferable to perform beam steering and beam sweeping in a much smaller unit (for example, a subframe unit) than the frame unit.

The process of FIG. 3 consists of the four steps shown in Table 2.

RAPS transmission step (1) The mobile station transmits one of the RAPS of N B x N U through beam steering (where N B is the number of base station beams and N U is the number of beams of the mobile terminal) RAPS receiving step (2) The base station continuously performs beam sweeping for RAPS reception. RAR transmission step (3) The base station transmits the RAR corresponding to the received RAPS using beam steering RAR receiving step (4) The mobile terminal searches for the RAR (ra-ResponseWindow size = N B + α (where α is a positive integer)) for a predetermined time (ra-ResponseWindow)

Also, in FIG. 3, RAPS to RAR indicated by solid lines indicate successful transmission / reception, and RAPS to RAR indicated by a dotted line indicate failure cases.

On the other hand, in the switched beamforming system, since the transmitter performs beam steering and transmits a message until the optimum transmission beam is fed back, the time required for the transmission is very long. Therefore, the present invention improves the time required for the random access procedure in the switched beamforming system by more efficiently performing the feedback of the optimum beam based on the existing LTE standard.

4 and 6, a mobile station and a base station for performing random access according to an embodiment of the present invention and a control method thereof will be described in detail.

FIG. 4 illustrates a process of performing random access through switched beamforming according to an embodiment of the present invention. Referring to FIG.

As described above, the random access through the switched beamforming is performed between the base station and the mobile terminal, and each of the base station and the mobile terminal includes a transmitter, a receiver, and a determiner.

First, in step 410, the transmission unit of the base station transmits the downlink synchronization signal to the mobile station using beam steering. At this time, the receiver of the mobile terminal receives the downlink synchronization signal using beam sweeping.

Next, in step 420, the determination unit of the mobile station determines the downlink transmission beam ID of the base station and the downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal.

Subsequently, in step 430, the transmitter of the mobile terminal transmits the first message including the RAPS and the downlink transmission beam ID of the base station to the base station using beam steering. At this time, the receiver of the base station can receive the first message using beam sweeping.

Here, the transmitting unit of the mobile terminal can transmit the first message through any one of the plurality of PRACH resources. Further, the plurality of PRACH resources may be determined by a frequency belonging to each of a plurality of PRACH subframes and a plurality of PRACH subframes.

According to an embodiment of the present invention, the mobile terminal can determine the ID of the RAPS and any one of the PRACH resources based on the downlink transmission beam ID of the base station. At this time, the downlink transmission beam ID of the base station can be expressed as a function of the subframe ID and frequency ID of any one of the PRACH resources and the ID of RAPS. This will be described in more detail as follows.

In the conventional LTE system, the number of RAPS ( N p ) is at most 64, the number of subframes ( N s ) in one frame is 10, and the number of frequencies N f is 6 in one frame. At this time, the mobile terminal can know the number of RAPS available through the system information. Since all the mobile stations in the cell of the base station perform the same process, there is a possibility of collision of RAPS, and the probability that two mobile stations transmit the same RAPS in one frame to be.

Therefore, in the case of the present invention, the downlink transmission beam ID (DL_TX_BID,

Figure 112015058499881-pat00002
) As an ID of RAPS (
Figure 112015058499881-pat00003
), The ID of the subframe (
Figure 112015058499881-pat00004
) And the ID of the frequency resource (
Figure 112015058499881-pat00005
). &Lt; / RTI &gt;

Figure 112015058499881-pat00006

As an example, equation (2) represents an example of the downlink beam ID of the base station.

Figure 112015058499881-pat00007

here

Figure 112015058499881-pat00008
Means the modulo value.

Referring to the above description, in order to display the downlink transmission beam ID of one base station,

Figure 112015058499881-pat00009
of
Figure 112015058499881-pat00010
Combinations are possible. The mobile terminal can select one of these combinations and transmit the RAPS.

E.g,

Figure 112015058499881-pat00011
, And when the downlink beam ID of the base station is 6, 120
Figure 112015058499881-pat00012
The combination of (0,1,0), (0,6,2), ... , (63, 5, 4) are possible. If the number of available PRACHs is reduced, the probability of collision between mobile terminals increases. However, in the case of a switched beamforming system, since a collision occurs when the PRACH is transmitted and received using the same beam, the collision probability with another terminal in the cell is
Figure 112015058499881-pat00013
to be.

In the case of the present invention, since beam steering is performed in units of subframes,

Figure 112015058499881-pat00014
Is set,
Figure 112015058499881-pat00015
For beam ID display,
Figure 112015058499881-pat00016
Every gun
Figure 112015058499881-pat00017
doggy
Figure 112015058499881-pat00018
Can be used. In this case, the collision probability with other terminals performing random access through the same subframe is
Figure 112015058499881-pat00019
to be.

Next, in step 440, the determination unit of the base station determines the uplink reception beam ID of the base station and the uplink transmission beam ID of the mobile station using the reception strength of the first message.

Thereafter, in step 450, the transmitter of the base station transmits a second message including the RAR corresponding to the RAPS and the uplink transmission beam ID of the mobile terminal to the mobile terminal via the PDCCH. At this time, the mobile terminal can search for and receive the second message through the response window without performing beam sweeping.

According to an embodiment of the present invention, when only one message can be transmitted in a subframe of the PDCCH, the transmitter of the base station transmits the second message using beam steering, and transmits a plurality of messages to the subframe of the PDCCH The transmitter of the base station can transmit the second message to the transmission beam according to the downlink transmission beam ID without performing beam steering.

In step 460, the transmitter of the mobile station transmits a response message to the receiver of the base station.

Hereinafter, step 450 will be described in detail with reference to FIG.

Like the existing LTE system, in the random access procedure based on the LTE system according to the present invention,

Figure 112015058499881-pat00020
,
Figure 112015058499881-pat00021
, And
Figure 112015058499881-pat00022
Transmission, the mobile station receives the RAR window size (ra - ResponseWindowSize) During RAR , Which may be different depending on how the RAR is transmitted.

Since the RAR is a message transmitted to the entire mobile terminal, it is transmitted through the PDCCH, which is a common channel that all mobile terminals can receive. When a base station transmits a RAR using an omnidirectional antenna, it can transmit through a single channel. However, if switched beamforming is used, the base station may transmit the beam through a beam-steering or a single channel .

5 is a view showing an example of RAR reception window size and corresponding RAR reception when beam steering is performed for RAR transmission according to an embodiment of the present invention.

In Figure 5, the red portion represents the receive window portion overlapping for RA1 and RA2. At this time, ambiguity about the transmission beam occurs in the overlapping portion. The mobile terminal transmits the RA

Figure 112015058499881-pat00023
Combination and RAR
Figure 112015058499881-pat00024
Only when the combinations are the same, it is regarded as a successful RA. Therefore, if there is no overlapping part of the receiving window of the RAR corresponding to different RA, the RAR
Figure 112015058499881-pat00025
The combination can be used to find the downlink transmit beam ID.

5, since RAR A (RAR C) belongs only to the reception window of RA 1 (RA 3), it can be confirmed that RAR A (RAR C) is a response to RA 1 (RA 3) Is transmitted through the beam 1 (2) to which the beam 1 belongs. However, if the receive window overlaps (RAR B belongs to both the receive window of RA 1 and RA 2), it can not be confirmed whether it is a response to RA 1 or a response to RA 2, I need a plan.

For two different RA transmissions, to distinguish the beam ID when there is a portion overlapping the RAR receive window,

Figure 112015058499881-pat00026
The combinations must be different. Therefore, for the feedback of the downlink transmission beam ID shown in Equation (1)
Figure 112015058499881-pat00027
, The condition shown in the following Equation 3 should be added.

Figure 112015058499881-pat00028

here,

Figure 112015058499881-pat00029
The RAR receiving window size,
Figure 112015058499881-pat00030
Denotes a subframe in which the kth RA is transmitted.

Hereinafter, the conventional method of FIG. 2 and the method of the present invention of FIG. 4 will be described with reference to FIG.

In accordance with the present invention, steps 230, 240, and 250 of FIG. 2, which are conventional, have been compressed into one process (step 430). That is, for the step 430, the beam steering is divided into the case of performing the beam steering according to the RAR common message transmission method and the case of not carrying out the beam steering.

6 is a diagram illustrating three cases of transmitting RARs according to an embodiment of the present invention.

Case 1 represents the conventional scheme of FIG. 2 without feedback of the optimal downlink transmission beam ID, and Case 2 represents the scheme of the present invention with feedback of the optimal downlink transmission optimum beam ID. Case 2-A represents a case where the base station performs beam steering, and Case 2-B represents a case where the base station does not perform beam steering.

The RAR transmission method of the base station does not depend on which mobile terminal the RA is received from, but in the example of FIG. 6, it is assumed that three RAs are received from the different terminals A, B, and C for the sake of understanding . That is, three terminals receive three RAs A to C ("A, B, C" indicated by the English characters of "RA Reception at BS"), and RA A, B, and C receive 0th, Lt; th &gt; receive beam.

In addition, in the case of the RAR transmission, the letters A to C indicate the RAR message corresponding to the RA receipt (A to C), respectively (the rest does not transmit the RAR message). It is assumed that the optimal beams for transmission of RARs corresponding to RA A, B, and C are 2, 3 and 4, respectively. Here, it can be seen that RA B and C are received through the same base station receive beam (No. 2), but RAR B and C corresponding thereto are transmitted through different transmission beams (B is 3 and C is 4) . This shows that the direction of the downlink and uplink beams may be different assuming that the channel reversibility is not ensured.

(Corresponding to Case 1 and Case 2-A) for transmission of the RAR is performed in units of one subframe (the number "0 to 7" indicated in the "TX Beam ID at BS" portion represents the transmission beam ID , Beam 0 to beam 7), and transmission of the RAR corresponding to each RA is performed through a transmission beam corresponding to each subframe. For example, the RAR indicated by A in Case 1 is transmitted 8 times from the first transmission beam to the 0th transmission beam, and the RAR indicated by B is transmitted from the third transmission beam to the second transmission beam 8 times. In one subframe, one or more RARs corresponding to the same beam can be simultaneously transmitted. For example, RARs A, B, and C transmitted simultaneously in the beam sections 3 to 0 of Case 1. The RAR receiving window shows the interval in which the mobile terminal should search for the RAR. When the base station performs beam steering, the reception window size of the RAR is

Figure 112015058499881-pat00031
(Case 2-A), the reception window size of the RAR is assumed to be 2.

In Case 1 and Case 2-A, it is assumed that only one beam is transmitted from the base station and beam steering is performed through switching for RAR transmission. In Case 2-A, a plurality of resources are allocated to one beam using different frequency bands. In Case 2-B, a base station has multiple beams and can transmit at the same time.

On the other hand, each mobile terminal knows information about the optimal downlink transmission beam of the base station corresponding to the mobile terminal. However, the process of transmitting the RAR depends on whether the information about the beam is fed back.

Case 1 does not feed back the optimal downlink transmission beam ID. The base station does not have information on the beam ID, and repeats the RAR for each RA by the number of base station beams N B through beam steering. In this case, for RAR transmission, a delay of N B times that of the existing LTE system occurs, and resources for RAR should be used N B times.

Case 2-A shows a case where the BS carries out beam steering with information on the optimal downlink transmission beam ID through feedback, and uses the existing PDCCH transmission scheme of the LTE system as it is. In the conventional PDCCH transmission scheme of the LTE system, RARs corresponding to different beams can not be allocated to the same subframe, and beam steering must be performed for RAR transmission. As a result, a delay of N B times can be avoided none. However, RAR is transmitted only in the subframe corresponding to the optimum transmission beam of each RA. That is, since A transmits RAR only to beam 2, B to beam 3, and C to beam 4, there is no waste of resources for RAR as in Case 1. However, since the size of the receiving window of the RAR is larger than the number of the transmitting beams, the mobile terminal must continuously search for RAR reception during the corresponding time, and there is a large power loss due to this.

Case 2-B illustrates a case where transmission of RARs belonging to different beams can be simultaneously transmitted in one subframe. Upon receiving the RA, the base station transmits the RAR to the next subframe, and transmits the RAR corresponding to the different beam to the same subframe. That is, A is simultaneously transmitted in the second sub-frame through the second beam, and B and C are simultaneously transmitted in the fourth sub-frame through the third beam and the fourth beam. Accordingly, Case 2-B has no delay and resource waste, and has a small power loss of the UE since the size of the RAR receiving window is small.

Table 3 compares the differences for each case. The number of the available PRACH with RA when the transmitting mobile terminal can use, and is reduced to 1 / N as compared with the case B it will not display the DL_TX_BID, thus the collision probability is doubled N B. However, the probability of collision of existing Omni system is 1 / The N U reduced by. If it does not display DL_TX_BID to the base station if the Omni of systems using resources as much as N B-fold, and a power consumption of the mobile station thereto increases, the invention to the RAR message sent is the same as the Omni system. Finally, the total delay is reduced to less than about one half.

Figure 112015058499881-pat00032

In addition, embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Examples of program instructions, such as magneto-optical and ROM, RAM, flash memory and the like, can be executed by a computer using an interpreter or the like, as well as machine code, Includes a high-level language code. The hardware devices described above may be configured to operate as one or more software modules to perform operations of one embodiment of the present invention, and vice versa.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and limited embodiments and drawings. However, it is to be understood that the present invention is not limited to the above- Various modifications and variations may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (13)

1. A control method of a mobile station for performing random access,
A method comprising: (a) receiving a downlink synchronization signal from a transmitted base station using beam steering, using beam sweep;
(B) determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal; And
(C) transmitting, to the base station, a first message including a random access preamble using beam steering and a downlink transmission beam ID of the base station,
Wherein the step (c) comprises: transmitting the first message through one of the plurality of PRACH resources, wherein the plurality of PRACH resources are allocated to a plurality of PRACH subframes and a frequency belonging to each of the plurality of PRACH subframes And determining whether or not the mobile terminal is a mobile terminal. delete The method according to claim 1,
Wherein the step (c) comprises: determining an ID of the random access preamble and the one of the PRACH resources based on a downlink transmission beam ID of the base station,
Wherein the downlink transmission beam ID of the base station is expressed by a function of a subframe ID and frequency ID of the one of the PRACH resources and an ID of the random access preamble. The method according to claim 1,
The base station receives the first message using beam sweep and determines an uplink reception beam ID of the base station and an uplink transmission beam ID of the mobile station using the reception strength of the first message To the mobile terminal. 5. The method of claim 4,
(D) receiving, from the base station via a PDCCH, a second message including a random access response corresponding to the random access preamble and an uplink transmission beam ID of the mobile terminal, Further included,
Wherein in step (d), the mobile terminal does not perform beam sweeping but searches for and receives the second message through a response window. 6. The method of claim 5,
If it is possible to transmit only one message in the subframe of the PDCCH, the BS transmits the second message using beam steering,
Wherein the base station transmits the second message to the transmission beam according to the downlink transmission beam ID without performing beam steering when a plurality of messages can be transmitted in the subframe of the PDCCH. Control method. A control method of a base station for performing random access,
(A) transmitting a downlink synchronization signal to a mobile station using beam steering; And
(B) receiving a first message including a random access preamble and a downlink transmission beam ID of a base station from the mobile station using beam sweep,
The mobile terminal receives the downlink synchronization signal through beam sweep and determines a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile terminal based on the reception intensity of the downlink synchronization signal Transmitting the first message using beam steering,
Wherein the step (b) comprises the steps of: receiving the first message through one of the plurality of PRACH resources, wherein the plurality of PRACH resources are allocated to a plurality of PRACH subframes and a frequency belonging to each of the plurality of PRACH subframes Wherein the base station is a mobile station. delete 8. The method of claim 7,
Wherein the mobile station determines the ID of the random access preamble and the one of the PRACH resources based on the downlink transmission beam ID of the base station,
Wherein the information of the downlink transmission beam ID of the base station is expressed as a function of a subframe ID and a frequency ID of the one of the PRACH resources and an ID of the random access preamble. 8. The method of claim 7,
(C) determining an uplink reception beam ID of the base station and an uplink transmission beam ID of the mobile station using the reception strength of the first message, according to the control method of the base station Of the base station. 11. The method of claim 10,
(D) transmitting a second message including a random access response corresponding to the random access preamble and an uplink transmission beam ID of the mobile station to the mobile station through a PDCCH; Further included,
Wherein the mobile terminal does not perform beam sweeping but searches for and receives the second message through a response window. 12. The method of claim 11,
If it is possible to transmit only one message in the subframe of the PDCCH, the BS transmits the second message using beam steering,
Wherein the base station transmits the second message to the transmission beam according to the downlink transmission beam ID without performing beam steering when a plurality of messages can be transmitted in the subframe of the PDCCH. Way. In a mobile terminal performing random access,
A receiver for receiving a downlink synchronization signal from a base station using beam steering using beam sweep;
A determination unit for determining a downlink transmission beam ID of the base station and a downlink reception beam ID of the mobile station using the reception strength of the downlink synchronization signal; And
And a transmitter for transmitting a first message including a random access preamble and a downlink transmission beam ID of the base station to the base station using beam steering,
Wherein the transmitting unit transmits the first message through one of the plurality of PRACH resources, the plurality of PRACH resources being determined by a frequency belonging to each of the plurality of PRACH subframes and the plurality of PRACH subframes Wherein the mobile terminal comprises:
KR1020150085736A 2015-06-17 2015-06-17 Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station KR101563469B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150085736A KR101563469B1 (en) 2015-06-17 2015-06-17 Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150085736A KR101563469B1 (en) 2015-06-17 2015-06-17 Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station

Publications (1)

Publication Number Publication Date
KR101563469B1 true KR101563469B1 (en) 2015-10-27

Family

ID=54428644

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150085736A KR101563469B1 (en) 2015-06-17 2015-06-17 Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station

Country Status (1)

Country Link
KR (1) KR101563469B1 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017176033A1 (en) * 2016-04-04 2017-10-12 삼성전자 주식회사 Method and apparatus for decoding random access response message in wireless communication system
WO2017213375A1 (en) * 2016-06-08 2017-12-14 엘지전자 주식회사 Method and apparatus for measuring downlink synchronization in wireless communication system
WO2017222132A1 (en) * 2016-06-24 2017-12-28 에스케이텔레콤 주식회사 Uplink signal transmission device and uplink signal transmission method
WO2018056730A1 (en) 2016-09-23 2018-03-29 Samsung Electronics Co., Ltd. Method and apparatus for random access in wireless systems
CN107969034A (en) * 2016-10-20 2018-04-27 上海朗帛通信技术有限公司 A kind of method and apparatus of random access in UE, base station
US9960830B2 (en) 2016-04-04 2018-05-01 Samsung Electronics Co., Ltd. Method and apparatus for managing beam in beamforming system
CN108496402A (en) * 2016-09-29 2018-09-04 华为技术有限公司 The method and device of initial access
WO2017171322A3 (en) * 2016-03-29 2018-09-07 엘지전자 주식회사 Method for performing random access procedure in next generation wireless communication system and apparatus therefor
KR101895713B1 (en) * 2017-04-05 2018-10-18 중앙대학교 산학협력단 Mobile terminal performing random access using plurality of antenna arrays and Random access method thereof
KR20180123205A (en) * 2017-05-04 2018-11-15 한국전자통신연구원 Method for transmitting and receiving message for random access in multi beam system
KR20180129954A (en) * 2016-04-20 2018-12-05 콘비다 와이어리스, 엘엘씨 Downlink synchronization
WO2019022314A1 (en) * 2017-07-28 2019-01-31 삼성전자주식회사 Method for performing rach procedure between terminal and base station, and base station and terminal therefor
JP2019503113A (en) * 2015-11-26 2019-01-31 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． Uplink access method, user equipment, and base station
KR20190034298A (en) * 2016-08-12 2019-04-01 후아웨이 테크놀러지 컴퍼니 리미티드 RANDOM ACCESS METHOD, DEVICE AND SYSTEM, TERMINAL, AND BASE STATION
CN109587814A (en) * 2017-09-29 2019-04-05 中兴通讯股份有限公司 A kind of random access repeating method and device
US10305637B2 (en) 2016-04-04 2019-05-28 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving feedback in wireless communication system
US10701684B2 (en) 2016-04-04 2020-06-30 Samsung Electronics Co., Ltd. Method and apparatus for decoding random access response message in wireless communication system
US10812238B2 (en) 2016-04-20 2020-10-20 Convida Wireless, Llc Configurable reference signals
US10840982B2 (en) 2016-08-11 2020-11-17 Convidia Wireless, LLC Beamforming sweeping and training in a flexible frame structure for new radio
US10868653B2 (en) 2016-06-15 2020-12-15 Convida Wireless, Llc Upload control signaling for new radio
US10880868B2 (en) 2016-04-20 2020-12-29 Convida Wireless, Llc System information provisioning and light weight connection signaling
US10932276B2 (en) 2016-11-03 2021-02-23 Convida Wireless, Llc Frame structure in NR
US11051293B2 (en) 2016-05-11 2021-06-29 Convida Wireless, Llc Radio PDCCH to facilitate numerology operations
JP2021530175A (en) * 2018-07-20 2021-11-04 維沃移動通信有限公司Ｖｉｖｏ Ｍｏｂｉｌｅ Ｃｏｍｍｕｎｉｃａｔｉｏｎ Ｃｏ．， Ｌｔｄ． Physical random access channel power control method and terminal
US11184121B2 (en) 2016-04-20 2021-11-23 Convida Wireless, Llc Physical channels in new radio
US11770821B2 (en) 2016-06-15 2023-09-26 Interdigital Patent Holdings, Inc. Grant-less uplink transmission for new radio
US11871451B2 (en) 2018-09-27 2024-01-09 Interdigital Patent Holdings, Inc. Sub-band operations in unlicensed spectrums of new radio

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014525192A (en) 2011-07-21 2014-09-25 サムスン エレクトロニクス カンパニー リミテッド Method and apparatus for transmitting and receiving information for random access in a wireless communication system
KR101447750B1 (en) 2008-01-04 2014-10-06 엘지전자 주식회사 Method for performing random access process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101447750B1 (en) 2008-01-04 2014-10-06 엘지전자 주식회사 Method for performing random access process
JP2014525192A (en) 2011-07-21 2014-09-25 サムスン エレクトロニクス カンパニー リミテッド Method and apparatus for transmitting and receiving information for random access in a wireless communication system

Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10531311B2 (en) 2015-11-26 2020-01-07 Huawei Technologies Co., Ltd. Uplink access method, user equipment, and base station
JP2019503113A (en) * 2015-11-26 2019-01-31 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． Uplink access method, user equipment, and base station
US11457477B2 (en) 2016-03-29 2022-09-27 Lg Electronics Inc. Method for performing random access procedure in next generation wireless communication system and apparatus therefor
WO2017171322A3 (en) * 2016-03-29 2018-09-07 엘지전자 주식회사 Method for performing random access procedure in next generation wireless communication system and apparatus therefor
US11395289B2 (en) 2016-04-04 2022-07-19 Samsung Electronics Co., Ltd. Method and apparatus for decoding random access response message in wireless communication system
US10986627B2 (en) 2016-04-04 2021-04-20 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving feedback in wireless communication system
US10701684B2 (en) 2016-04-04 2020-06-30 Samsung Electronics Co., Ltd. Method and apparatus for decoding random access response message in wireless communication system
WO2017176033A1 (en) * 2016-04-04 2017-10-12 삼성전자 주식회사 Method and apparatus for decoding random access response message in wireless communication system
US10305637B2 (en) 2016-04-04 2019-05-28 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving feedback in wireless communication system
US10939429B2 (en) 2016-04-04 2021-03-02 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving feedback in wireless communication system
US9960830B2 (en) 2016-04-04 2018-05-01 Samsung Electronics Co., Ltd. Method and apparatus for managing beam in beamforming system
KR20180129954A (en) * 2016-04-20 2018-12-05 콘비다 와이어리스, 엘엘씨 Downlink synchronization
US10812238B2 (en) 2016-04-20 2020-10-20 Convida Wireless, Llc Configurable reference signals
US10791531B2 (en) 2016-04-20 2020-09-29 Convida Wireless, Llc Downlink synchronization
KR20200106220A (en) * 2016-04-20 2020-09-11 콘비다 와이어리스, 엘엘씨 Downlink synchronization
US11184121B2 (en) 2016-04-20 2021-11-23 Convida Wireless, Llc Physical channels in new radio
US11218267B2 (en) 2016-04-20 2022-01-04 Convida Wireless, Llc Configurable reference signals
KR102207045B1 (en) 2016-04-20 2021-01-25 콘비다 와이어리스, 엘엘씨 Downlink synchronization
US10880868B2 (en) 2016-04-20 2020-12-29 Convida Wireless, Llc System information provisioning and light weight connection signaling
KR102153077B1 (en) 2016-04-20 2020-09-07 콘비다 와이어리스, 엘엘씨 Downlink synchronization
US11051293B2 (en) 2016-05-11 2021-06-29 Convida Wireless, Llc Radio PDCCH to facilitate numerology operations
US11109328B2 (en) 2016-06-08 2021-08-31 Lg Electronics Inc. Method and apparatus for measuring downlink synchronization in wireless communication system
WO2017213375A1 (en) * 2016-06-08 2017-12-14 엘지전자 주식회사 Method and apparatus for measuring downlink synchronization in wireless communication system
US11770821B2 (en) 2016-06-15 2023-09-26 Interdigital Patent Holdings, Inc. Grant-less uplink transmission for new radio
US10868653B2 (en) 2016-06-15 2020-12-15 Convida Wireless, Llc Upload control signaling for new radio
WO2017222132A1 (en) * 2016-06-24 2017-12-28 에스케이텔레콤 주식회사 Uplink signal transmission device and uplink signal transmission method
US11019664B2 (en) 2016-06-24 2021-05-25 Sk Telecom Co., Ltd. Uplink signal transmission device and uplink signal transmission method
US10840982B2 (en) 2016-08-11 2020-11-17 Convidia Wireless, LLC Beamforming sweeping and training in a flexible frame structure for new radio
KR20190034298A (en) * 2016-08-12 2019-04-01 후아웨이 테크놀러지 컴퍼니 리미티드 RANDOM ACCESS METHOD, DEVICE AND SYSTEM, TERMINAL, AND BASE STATION
KR102186920B1 (en) 2016-08-12 2020-12-04 후아웨이 테크놀러지 컴퍼니 리미티드 Random access method, apparatus and system, terminal, and base station
US11382135B2 (en) 2016-08-12 2022-07-05 Huawei Technologies Co., Ltd. Configuring different types of random resources
KR20190045920A (en) * 2016-09-23 2019-05-03 삼성전자주식회사 Method and apparatus for random access in a wireless system
US10405353B2 (en) 2016-09-23 2019-09-03 Samsung Electronics Co., Ltd. Method and apparatus for random access in wireless systems
EP3501227A4 (en) * 2016-09-23 2019-07-24 Samsung Electronics Co., Ltd. Method and apparatus for random access in wireless systems
WO2018056730A1 (en) 2016-09-23 2018-03-29 Samsung Electronics Co., Ltd. Method and apparatus for random access in wireless systems
KR102358102B1 (en) * 2016-09-23 2022-02-04 삼성전자 주식회사 Method and apparatus for random access in wireless system
CN108496402A (en) * 2016-09-29 2018-09-04 华为技术有限公司 The method and device of initial access
US11202318B2 (en) 2016-09-29 2021-12-14 Huawei Technologies Co., Ltd. Initial access method and apparatus
CN107969034B (en) * 2016-10-20 2020-02-18 上海朗帛通信技术有限公司 UE, method and device for random access in base station
CN107969034A (en) * 2016-10-20 2018-04-27 上海朗帛通信技术有限公司 A kind of method and apparatus of random access in UE, base station
US11877308B2 (en) 2016-11-03 2024-01-16 Interdigital Patent Holdings, Inc. Frame structure in NR
US11438905B2 (en) 2016-11-03 2022-09-06 Interdigital Patent Holdings, Inc. Frame structure in NR
US10932276B2 (en) 2016-11-03 2021-02-23 Convida Wireless, Llc Frame structure in NR
KR101895713B1 (en) * 2017-04-05 2018-10-18 중앙대학교 산학협력단 Mobile terminal performing random access using plurality of antenna arrays and Random access method thereof
KR20180123205A (en) * 2017-05-04 2018-11-15 한국전자통신연구원 Method for transmitting and receiving message for random access in multi beam system
KR102460266B1 (en) * 2017-05-04 2022-10-31 한국전자통신연구원 Method for transmitting and receiving message for random access in multi beam system
CN110999497A (en) * 2017-07-28 2020-04-10 三星电子株式会社 Method for performing RACH procedure between terminal and base station, and base station and terminal using same
KR102406365B1 (en) * 2017-07-28 2022-06-08 삼성전자주식회사 Method, base station and terminal for performing rach procedure between terminal and base station
KR20190012726A (en) * 2017-07-28 2019-02-11 삼성전자주식회사 Method, base station and terminal for performing rach procedure between terminal and base station
US11184932B2 (en) 2017-07-28 2021-11-23 Samsung Electronics Co., Ltd. Method for performing RACH procedure between terminal and base station, and base station and terminal therefor
CN110999497B (en) * 2017-07-28 2023-10-20 三星电子株式会社 Method for performing RACH procedure between terminals and base station, and base station and terminal using the same
WO2019022314A1 (en) * 2017-07-28 2019-01-31 삼성전자주식회사 Method for performing rach procedure between terminal and base station, and base station and terminal therefor
CN109587814A (en) * 2017-09-29 2019-04-05 中兴通讯股份有限公司 A kind of random access repeating method and device
JP7178479B2 (en) 2018-07-20 2022-11-25 維沃移動通信有限公司 Physical random access channel power control method and terminal
US11445448B2 (en) 2018-07-20 2022-09-13 Vivo Mobile Communication Co., Ltd. Power control method for physical random access channel and terminal
JP2021530175A (en) * 2018-07-20 2021-11-04 維沃移動通信有限公司Ｖｉｖｏ Ｍｏｂｉｌｅ Ｃｏｍｍｕｎｉｃａｔｉｏｎ Ｃｏ．， Ｌｔｄ． Physical random access channel power control method and terminal
US11871451B2 (en) 2018-09-27 2024-01-09 Interdigital Patent Holdings, Inc. Sub-band operations in unlicensed spectrums of new radio

Similar Documents

Publication Publication Date Title
KR101563469B1 (en) Mobile station and Method for controlling the mobile station performing random access with switched beamforming, and Method for controlling base station
US11240784B2 (en) Apparatus and method for performing random access in beam-formed system
US10355761B2 (en) Beam administration methods for cellular/wireless networks
US10506606B2 (en) Method and apparatus for aligning antenna beams in high-low frequency co-site network
US10433335B2 (en) System and method for beam-based physical random-access
US10531311B2 (en) Uplink access method, user equipment, and base station
US10548101B2 (en) Method for accessing millimeter wave cell in wireless communication system and apparatus therefor
EP3531787B1 (en) Wave beam-based multi-connection communication method, terminal device, and network device
US7043274B2 (en) System for efficiently providing coverage of a sectorized cell for common and dedicated channels utilizing beam forming and sweeping
KR102080037B1 (en) Access Nodes and Beamforming Method for Receiving and Transmitting Signals in Wireless Communication Network
KR20170106446A (en) A method for obtaining a position of a UE,
EP3525362A1 (en) Beam determination methods executed during uplink random access, user equipment and base station
US20160212680A1 (en) Rapid rerouting in a communication system
CN106851560B (en) Method and system for establishing high-frequency communication link and electronic equipment
CN107645322B (en) Random access method and equipment based on beamforming
US20200037394A1 (en) Base station, terminal apparatus, method, program, and recording medium
RU2709827C1 (en) Devices and methods of communication with preparation of beam forming
EP3247156B1 (en) Device and method for signal transmission
KR102021089B1 (en) Uplink signal transmitting apparatus and method
WO2009075622A1 (en) An improved broadcast channel.
CN114982363A (en) Joint processing of random access channel communications
US11832312B2 (en) Method and apparatus for random access in wireless communication system
KR20160081771A (en) Method for transmitting and receiving Random Access Channel in wireless communication systems
WO2010059085A1 (en) Power control in a cellular mbms system
KR102522776B1 (en) Communication node for transmitting random access signal using a plurality of random access channel and therefor operation method in wireless communication system

Legal Events

Date Code Title Description
A302 Request for accelerated examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20181122

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20191001

Year of fee payment: 5