RU2787015C1 - Terminal, wireless communication system and communication method - Google Patents

Abstract

FIELD: communications.

SUBSTANCE: invention relates to the field of communications. To achieve the effect, the user equipment comprises a transmitter configured to transmit a random access preamble and information for identifying a terminal to a base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal in a two-stage random access procedure; and a control module configured to consider the contention resolution successful when the information contained in said response signal matches at least a portion of the information for identifying the terminal, wherein the transmitter is configured to distinguish the resource position used to transmit the random access preamble in the two-stage random access procedure , from the resource position used to transmit the random access preamble in the four-way random access procedure.

EFFECT: achieving conflict resolution in the random access procedure when there is a conflict.

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Description

This application is separated from application No. 2021123164 for the grant of a patent of the Russian Federation for an invention, filed on 02/01/2019 and claims priority according to international application No. PCT/JP2019/003756, filed on 02/01/2019.

The technical field to which the invention belongs

The present invention relates to a user device and a base station in a radio communication system.

State of the art

For the New Radio System (NR), which is the successor to the Long Term Evolution (LTE) system and is also called the Fifth Generation (5G) System, a technology is being discussed that will make it possible to meet requirements such as high capacity systems, high data rate, low latency, simultaneous connection with multiple terminals, low cost, energy saving, and the like. (for example, non-patent document 1).

As in LTE, random access is performed in NR to establish synchronization between the user equipment and the base station or to request scheduling. There are two types of random access procedure: Contention Based Random Access (CBRA) and Contention Free Random Access (CFRA) (for example, non-patent document 2).

Prior Art Documents

Non-Patent Documents

Non-Patent Document 1: 3GPPTS 38.300 V15.4.0 (2018-12). Non-Patent Document 2: 3GPPTS 38.321 V15.4.0 (2018-12).

Disclosure of the essence of the invention Disadvantage eliminated by the invention

For the NR system, in addition to the usual four-stage random access procedure with the possibility of collision, a two-stage random access procedure is studied. The two-stage random access procedure, being a collision-prone random access procedure, also requires conflict resolution to be performed.

The present invention has been developed in view of the foregoing, and the subject of the present invention is to perform conflict resolution in a random access procedure with a possibility of conflict.

Remedy

The user device proposed according to the disclosed technical solution comprises: a transmitter configured to transmit a random access preamble or user device identifier to a base station in a two-stage random access procedure, a receiver configured to receive a response signal from said base station corresponding to at least one of said random access preamble and user device identifier, and, based on said response signal, a downstream signal, and a control module configured to consider the contention resolution successful if the information contained in said downstream signal matches the entire identifier of said user device or its parts.

In a preferred embodiment, the response signal comprises a distribution of the downstream signal.

In a preferred embodiment, the response signal contains information indicating that a two-stage random access procedure is being performed.

In a preferred embodiment, the reception of the response signal and the downlink signal is provided in different frequency domains or in different time domains.

The base station proposed according to the disclosed technical solution comprises: a receiver configured to receive from a user device at least one of a random access preamble and a user device identifier in a two-stage random access procedure; a control module, configured to include all or part of the user equipment ID in information included in the downstream signal; and a transmitter configured to transmit to the user equipment a response signal corresponding to at least one of the random access preamble and the identifier of said base station, and a downstream signal based on said response signal.

A terminal provided according to the disclosed technical solution comprises: a transmitter configured to transmit a random access preamble and terminal identification information to a base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal in a two-stage random access procedure; and a control module configured to consider the contention resolution successful when the information contained in said response signal matches at least a portion of the information for identifying the terminal, wherein the transmitter is configured to distinguish the resource position used to transmit the random access preamble in the two-stage random access procedure , from the resource position used to transmit the random access preamble in the four-way random access procedure.

The wireless communication system proposed according to the disclosed technical solution includes a terminal and a base station, and the terminal includes: a transmitter configured to transmit a random access preamble and terminal identification information to the base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal in a two-stage random access procedure; and a control module configured to consider the contention resolution successful when the information contained in said response signal matches at least a portion of the information for identifying the terminal, wherein the transmitter is configured to distinguish the resource position used to transmit the random access preamble in the two-stage random access procedure , from the resource position used to transmit the random access preamble in the four-stage random access procedure, and the base station comprises: a receiver configured to receive, from said terminal, the random access preamble and terminal identification information in the two-stage random access procedure; and a transmitter configured to send a response signal to said terminal in a two-stage random access procedure.

The communication method proposed by the disclosed technical solution includes: transmitting a random access preamble and terminal identification information to a base station in a two-stage random access procedure; receiving from said base station a response signal in a two-stage random access procedure; determining that the contention resolution is successful when the information contained in said response signal matches at least part of the information for identifying the terminal, and distinguishing the resource position used for transmitting the random access preamble in the two-stage random access procedure from the resource position used for transmitting the preamble random access in a four-stage random access procedure.

Invention Effect

It is possible to perform conflict resolution in a random access procedure with the possibility of conflict according to the disclosed technical solution.

Brief description of the drawings

Fig. 1 is a diagram for describing a radio communication system according to an implementation of the present invention.

Fig. 2 is a sequence diagram for describing a first example of a random access procedure.

Fig. 3 is a sequence diagram for describing a second example of a random access procedure.

Fig. 4 is a sequence diagram for describing an example of a four-stage random access procedure.

Fig. 5 is a sequence diagram for describing an example of a two-stage random access procedure.

Fig. 6 is a diagram illustrating an example of a Msg2 message in a four-way random access procedure.

Fig. 7 is a diagram illustrating an example of a Msg4 message in a four-way random access procedure.

Fig. 8 is a flowchart for describing a first example of a random access procedure according to an implementation of the present invention.

Fig. 9 is a flowchart for describing a second example of a random access procedure according to an implementation of the present invention.

Fig. 10 is a diagram illustrating an example of a functional configuration of a base station 10 according to an implementation of the present invention.

Fig. 11 is a diagram illustrating an example of a functional configuration of a user device 20 according to an implementation of the present invention.

12 is a diagram illustrating an example of a hardware configuration of a base station 10 or user equipment 20 according to an implementation of the present invention.

Implementation of the invention

Next, with reference to the drawings, exemplary implementations of the present invention are described. The implementations described below are examples, and the implementations to which the present invention is applicable are not limited to these implementations.

The operation of the radio communication system according to the implementation of the present invention can appropriately use the existing technology. A non-limiting example of such existing technology is the current LTE system. In this document, unless otherwise indicated, "LTE" is understood in a broad sense, including an advanced system of LTE (eng. LTE-Advanced) and systems following LTE-Advanced (eg, NR).

The implementation described below uses terms from current LTE, such as Synchronization Signal (SS), Primary SS (PSS), Secondary SS, SSS), "Physical Broadcast Channel" (Physical Broadcast Channel, RVSN) and "Physical Random Access Channel" (Physical Random Access Channel, PRACH). These terms are used for convenience of description, and signals and functional modules like these may be referred to differently. In NR, the above terms correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, the prefix "NR-" is not always present in its designation.

In the implementation of the present invention, time division duplex (TDD), frequency division duplex (FDD), or another method (for example, flexible division duplex) can be used as a duplex method. .

In the implementation of the present invention, the wording indicating that a radio parameter or the like is set may mean that this parameter is set to a predetermined value, or that this parameter is set to a value transmitted from the base station 10 or from the user equipment 20.

1 is a diagram for describing a radio communication system according to an implementation of the present invention. Fig. 1 shows that a radio communication system according to an implementation of the present invention comprises a base station 10 and a user equipment 20. Fig. 1 shows one base station 10 and one user equipment 20, but this is only an example, and multiple base stations 10 and many user devices 20.

The base station 10 forms one or more cells and is a communication device capable of radio communication with the user device 20. The physical resource of the radio signal is defined by the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 is configured to transmit to the user device 20 a synchronization signal and system information. The synchronization signal is, for example, NR-PSS or NR-SSS. The system information is transmitted on the NR-PBCH, for example, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 is configured to transmit a control signal or data to the user device 20 via a downlink, and to receive a control signal or data from the user device 20 via an uplink. Both base station 10 and user equipment 20 are configured to beamform for signal transmission and reception. Both the base station 10 and the user equipment 20 are configured to use communication using multiple weakly correlated antennas (English Multiple Input Multiple Output, MIMO) in the downlink or uplink. Both the base station 10 and the user equipment 20 are configured to communicate via a carrier aggregation (AH) secondary cell (Secondary Cell, SCell) and a primary cell (Primary Cell, PCell).

The user device 20 is a communication device including a wireless communication function module, such as a smartphone, a mobile phone, a tablet, a handheld terminal, a machine-to-machine (M2M) communication module. 1, the user equipment 20 is configured to use a variety of communication services provided by a wireless communication system by receiving a control signal or data from a base station 10 via a downlink and transmitting a control signal or data to the base station 10 via an uplink.

In the random access procedure performed, for example, to establish synchronization between the user device 20 and the base station 10 or to request scheduling, the user device 20 transmits to the base station 10 as an uplink signal a random access preamble or user equipment identifier (English User Equipment, UE ), and the base station 10 transmits to the user equipment 20 a random access response and information using which the contention is resolved as a downstream signal.

Fig. 2 is a sequence diagram for describing a first example of a random access procedure. In the example of FIG. 2, a random access procedure with the possibility of a collision is shown. At the start of the random access procedure, in step S11, the user equipment 20 transmits a random access preamble to the base station 10. In step S12, the base station 10 transmits a random access response to the user equipment 20. In step S13, the user equipment 20 performs the transmission scheduled by said random access response to the base station 10. Information identifying the user device 20 is transmitted by said scheduled transmission. In step S14, the base station 10 sends information to the user device 20 to perform conflict resolution. If the conflict is successfully resolved, the random access procedure successfully completes.

Fig. 3 is a sequence diagram for describing a second example of a random access procedure. In the example of FIG. 3, a random access procedure without the possibility of a collision is shown. At the beginning of the random access procedure, in step S21, the base station 10 assigns the user equipment 20 a random access preamble. In step S22, the user equipment 20 transmits the assigned random access preamble to the base station 10. Then, the base station 10 transmits a random access response to the user equipment 20.

Fig. 4 is a sequence diagram for describing an example of a four-stage random access procedure. The random access procedure shown in the example of FIG. 4 is a collision-capable random access procedure like that shown in FIG. 2, and is a four-stage random access procedure. In step S31, the user equipment 20 transmits the random access preamble to the base station 10 as a Msg1 message. In step S32, the base station 10 transmits a random access response to the user equipment 20 as a Msg2 message. In step S33, the user equipment 20 transmits the UE ID to the base station 10 as a Msg3 message. Then, the base station 10 transmits to the user equipment 20 information for performing contention resolution as a Msg4 message. If the conflict is successfully resolved, the random access procedure successfully completes.

Fig. 5 is a sequence diagram for describing an example of a two-stage random access procedure. The random access procedure shown in the example of FIG. 5 is a collision-capable random access procedure, and is a two-stage random access procedure. A two-stage random access procedure is being studied to reduce time costs. In step S41, the user equipment 20 transmits to the base station 10 the random access preamble and the UE ID as an MsgA message. In step S42, the base station 10 transmits to the user equipment 20 a random access response and information for performing contention resolution as an Msg B message. If the contention resolution is successful, the random access procedure is successfully completed. In step S41, either one of the random access preamble and the UE ID may be transmitted as the MsgA.

Fig. 6 is a diagram illustrating an example of a Msg2 message in a four-way random access procedure. As shown in Fig.6, Msg2, which is the useful content of the Medium Access Control MAC layer in the random access response, contains the timing advance command (Eng. Timing Advance Command), ascending grant (Eng. UL Grant) and temporary C-RNTI (English Temporary C-RNTI). R denotes a reserved bit.

The timing advance command is a parameter that determines the timing for upstream transmission. The base station 10 adjusts the uplink transmission time so that the uplink reception from each user equipment 20 occurs within a predetermined interval. The uplink grant is a parameter for uplink scheduling. Based on the uplink grant, the user device 20 transmits a Msg3 message in the uplink. Temporary C-RNTI (Cell-Radio Network Temporary Identifier) is a temporary cell identifier used in the radio network. Upon successful contention resolution with Msg4, the temporary C-RNTI is used as the C-RNTI.

Fig. 7 is a diagram illustrating an example of a Msg4 message in a four-way random access procedure. As shown in FIG. 7, the Msg4 for contention resolution contains a UE Contention Resolution Identity. The user equipment 20 considers the contention resolution successful if the received contention resolution ID of the UE matches the information transmitted in Msg3. In other words, if the transmitted Msg3 contains a CCCH SDU (Service Data Unit (SDU) of the Common Control Channel, CCCH)), then the conflict resolution is considered successful if the PDCCH through which the Msg4 was transmitted, is addressed to the temporary C-RNTI and contains part of the transmitted CCCH SDU. Hereinafter, a random access procedure in which conflict resolution is performed in the manner described above is referred to as a random access procedure using a CCCH SDU.

If the transmitted Msg3 contains a C-RNTI, then the contention resolution is considered successful when the PDCCH on which the Msg4 is transmitted is addressed to the C-RNTI or addressed to the C-RNTI and contains an uplink grant. , is called a random access procedure without using the CCCH SDU.

It is assumed that the content of the message Msg B in the two-stage random access procedure should be information corresponding to the content of the messages Msg2 and Msg 4 in the four-stage random access procedure.

However, it is not clear how to include the information included in Msg2 or Msg4 in the four-way random access procedure in MsgB. Next, using FIG. 8, a random access procedure without using a CCCH SDU will be described, and using FIG. 9, a random access procedure using a CCCH SDU will be described.

Fig. 8 is a flowchart for describing a first example of a random access procedure according to an implementation of the present invention. Using Fig. 8, a two-stage random access without using a CCCH SDU is described.

In step S51, the user equipment 20 starts a two-stage random access procedure without using the CCCH SDU. In step S52, the user equipment 20 performs conflict resolution in a two-stage random access procedure.

The conflict resolution in step S52 may be performed in the manner described in the following paragraphs 1)-3).

1) User equipment 20 receives a MsgB random access response scrambled with C-RNTI. Scrambled by the C-RNTI in this MsgB may be a PDCCH, or a PDSCH, or both a PDCCH and a PDSCH. The user equipment 20 determines the contention resolution information addressed to it based on the result of the downlink signal decoding, similar to how it is done for Msg4 in the four-stage random access procedure. The user equipment 20 considers the contention resolution successful if the decoding of the MsgB was successful, assuming it was scrambled by the C-RNTI.

2) The user equipment 20 receives an MsgB similar to Msg2 and determines the success of the contention resolution in the two-stage random access procedure by interpreting the "Temporary C-RNTI" field as C-RNTI. In other words, in the four-stage random access procedure and in the two-stage random access procedure, this field is given a different meaning. A MsgB similar to Msg2 could be a MsgB that uses the same Protocol Data Unit (PDU) format (i.e., the same random access response payload) as the current Msg2 (i.e., i.e., in a random access response), or maybe MsgB, which uses some or all of the information corresponding to the information transmitted by the current Msg2. The expression "in the two-stage random access procedure" may mean "when MsgB is expected to be received in the random access procedure", may mean "when MsgA is transmitted", may mean "in a specific RRC layer procedure, MAC layer procedure, or the like (i.e. ., in a procedure initiating a two-stage random access procedure)".

3) The user equipment 20 determines the success of the contention resolution by the CE MAC C-RNTI indicated in the new field of the MsgB message. This new field may be placed in the payload of the random access response, or the indicated MAC CE C-RNTI may be transmitted via another MAC PDU. When the C-RNTI of the MAC CE is transmitted by another MAC PDU, the resource allocation information of the other MAC PDU may be indicated by the payload content of the random access response.

According to the above paragraph 2), by simply interpreting the "Temporary C-RNTI" field as C-RNTI, the user device 20 performing the two-way random access procedure can receive MsgB addressed to the user device 20 performing the two-way random access procedure as Msg2, addressed to yourself. Thus, one of the methods described in the following paragraphs a), b) and c) can be used.

a) The positions of the random access preamble resources in the time domain or in the frequency domain in the two-stage random access procedure and in the four-stage random access procedure are made different. As a result, the RA-RNTIs (RNTIs for random access) of the random access responses become different, making it possible to distinguish between Msg2 and MsgB.

b) In the 2-way random access procedure, a predetermined offset is added to the RA-RNTI, which makes the RA-RNTI in the 4-way random access procedure and the RA-RNTI in the 2-way random access procedure different. As a result, Msg2 can be distinguished from MsgB.

c) In the random access response, information indicating whether a two-stage random access procedure or a four-stage random access procedure is being performed can be transmitted. For such notification, for example, a MAC subheader field of the random access response, or a bit included in the payload of the random access response (eg, the R bit) may be used. The information in the random access response notifying whether a two-stage random access procedure or a four-stage random access procedure is being performed may be, for example, information announcing whether the response message is for a two-stage random access procedure or a four-stage random access procedure; there may be information indicating whether the message is the currently used Msg2 message; and there may be information indicating whether the message is a MsgB message. In addition, for example, if the random access response does not contain information indicating whether a two-way random access procedure or a four-way random access procedure is being performed, then this message may be considered as the currently used Msg2 or as MsgB.

9 is a flowchart for describing a second example of a random access procedure according to an implementation of the present invention. Using Fig. 9, a two-stage random access procedure without using a CCCH SDU is described.

In step S61, the user equipment 20 starts a two-stage random access procedure using the CCCH SDU. In step S62, the user equipment 20 performs conflict resolution in a two-stage random access procedure.

Collision resolution in step S62 may be performed by transmitting part of the UE ID or the entire UE ID transmitted by the MsgA message, which is equivalent to the CCCH SDU transmitted by the Msg3 message in the four-way random access procedure, by the downlink MAC CE, by the methods described in the following clauses 1) -3). The MAC CE in the following description contains part of the UE ID or the entire UE ID transmitted by MsgA, which is equivalent to the CCCH SDU transmitted by the Msg3 message in the four-way random access procedure.

1) The downstream allocation may be signaled by a random access response. The MAC CE is transmitted over a downlink that is allocated according to this downlink. The user device 20 receives MsgB like Msg2, and the existing Upstream Grant field can be interpreted as a downstream allocation. The value of the "Temporary C-RNTI" field may be interpreted as information about the downstream allocation (eg, information about the resource or time interval of the response to the random access response (which, for example, is the HARQ ACK)). When the downstream allocation is signaled by a random access response, the MAC subheader or payload of the random access response may indicate that this random access response is for a two-stage random access procedure in which part of the UE ID or the entire UE ID is transmitted by MsgA, which is equivalent to the CCCH SDU. A MsgB similar to Msg2 could be a MsgB that uses the same Protocol Data Unit (PDU) format (i.e., the same random access response payload) as the current Msg2 (i.e., i.e., in a random access response), or maybe MsgB, which uses some or all of the information corresponding to the information transmitted by the current Msg2.

2) The MAC CE may be transmitted separately from the random access response. The transmission of such a MAC CE may be indicated by a MAC subheader or the payload of a random access response.

3) A portion of the MAC CE information may be transmitted by a random access response. The MAC CEs or the entire MAC CE are mapped to specific fields (eg, Upstream Grant, Temporary C-RNTI, etc.) of the random access response. The user equipment 20 determines whether the contention resolution is successful based on some or all of the bit sequences mapped by the specified MAC CE.

In 1) and 2) above, the random access response and MAC CE may be transmitted and received on different frequencies or different time resources.

According to the above implementations, the user equipment 20, when the CCCH SDU is not used in the two-stage random access procedure, can perform conflict resolution by decoding the data scrambled by the C-RNTI or by obtaining the C-RNTI. When the CCCH SDU is used in the two-stage random access procedure, the user equipment 20 may perform contention resolution by obtaining the MAC CE based on the random access response.

Thus, it is possible to perform conflict resolution in a random access procedure with a possibility of conflict.

(functional configuration)

The following describes an example of the functional configurations of the base station 10 and the user equipment 20, configured to implement the above-described processes and operations. The base station 10 and the user device 20 contain functional elements for implementing the above-described embodiments. However, both the base station 10 and the user device 20 may contain only a portion of the functional elements shown in these embodiments.

<Base Station 10>

Fig. 10 is a diagram illustrating an example of the functional configuration of the base station 10. The base station 10 shown in FIG. 10 includes a transmitter 110, a receiver 120, a tuning module 130, and a control module 140. The functional configuration shown in Fig. 10 is only an example. Provided that it can function according to the implementation of the present invention, the division into functional elements and the names of functional elements are not limited.

Transmitter 110 includes functional elements for generating a signal to be transmitted to user device 20 and for wireless transmission of this signal. The receiver 120 includes functional elements for receiving various types of signals transmitted from the user device 20 and for deriving, for example, upper layer information from the received signal. The transmitter 110 includes a function for transmitting NR-PSS, NR-SSS, NR-PBCH, down/up control, down/up data, and the like to user equipment 20.

The setting unit 130 is configured to store predetermined setting information and various setting information to be transmitted to the user device 20 in a storage device and read information from the storage device as needed. The content of said setting information includes, for example, a setting related to random access.

The control module 140 is configured to perform, in conjunction with the user device 20, a two-stage random access procedure and a four-stage random access procedure, as described in the implementations. Functional elements of control module 140 related to signal transmission may be contained in transmitter 110, and functional elements of control module 140 related to signal reception may be contained in receiver 120.

User Device 20

Fig. 11 is a diagram illustrating a functional configuration example of the user equipment 20. The user equipment 20 shown in FIG. 11 includes a transmitter 210, a receiver 220, a tuning module 230, and a control module 240. The functional configuration shown in Fig. 11 is just an example. Provided that it can function according to the implementation of the present invention, the division into functional elements and the names of functional elements are not limited.

The transmitter 210 is configured to generate a signal to be transmitted from the data to be transmitted and to wirelessly transmit the signal. The receiver 220 is configured to wirelessly receive various types of signals and derive higher layer signals from the received physical layer signal. The receiver 220 includes a functional element for receiving an NR-PSS, NR-SSS, NR-PBCH, downlink/uplink/immediate control signal, or the like, transmitted from the base station 10. For example, the transmitter 210 is configured to transmit a physical immediate control channel (Physical Sidelink Control Channel, PSCCH), Physical Direct Shared Channel (Physical Sidelink Shared Channel, PSSCH), Physical Direct Detection Channel (Physical Sidelink Broadcast Channel, PSDCH), Physical Direct Broadcast Channel (Physical Sidelink Broadcast Channel, PSBCH) or the like to another user device 20 within a device-to-device (D2D) communication, and the receiver 120 is configured to receive PSCCH, PSSCH, PSDCH, PSBCH, or the like. p. from another user device 20.

The tuning module 230 is configured to store various tuning information received by the receiver 220 from the base station 10 or from the user device 20 in a storage device and to read the information from this storage device as needed. The tuning unit 230 is also configured to store preset tuning information. The content of said setting information includes, for example, a setting related to random access.

The control module 240 is configured to perform, in conjunction with the base station 10, a two-way random access procedure and a four-way random access procedure, as described in the implementations. controls relating to signal reception may be contained in receiver 220.

<Hardware configuration>

The functional diagrams used to describe the above implementations (FIG. 10 and FIG. 11) show blocks of functional modules. These functional blocks (components) are implemented in hardware, software, or any combination of them. The means for implementing each functional block is not specifically limited. In other words, each functional block may be implemented by a single device, in which the components are connected physically or logically, or by a plurality of devices, physically or logically separate and connected directly or indirectly (eg, by a wired or wireless connection). A functional block may be implemented by combining a single device or a plurality of devices described above with software.

The functions include determination, decision making, judgment, calculation, calculation, processing, inference, research, search, confirmation, reception, transmission, information output, access, disambiguation, selection, selection, establishment, comparison, assumption, assumption, consideration, broadcast, notification, communication, forwarding, configuration, reconfiguration, selection, display, and assignment, but not limited to the above list. For example, a functional block (component) that provides transmission is called a transmission module or transmitter. As stated above, the means for implementing the transmission module and the transmitter are not limited.

For example, the base station 10, the user equipment 20, or the like according to an implementation of the present invention can function as a computer performing the operations of the radio communication method of the present invention. Fig. 12 is a diagram illustrating an example of a hardware configuration of a base station 10 or a user equipment 20 according to an implementation of the present invention. The base station 10 and user device 20 described above may be configured as a computing device physically comprising a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

In the following description, the word "device" may be interpreted as a circuit, a module, or the like. In the hardware configurations of the base station 10 and the user device 20, the devices shown in the drawing may contain one or more devices, or some of these devices may not be included.

Each functional unit of the base station 10 and the user equipment 20 is implemented by performing the following operation: predetermined software (program) is loaded into the hardware, for example, into the processor 1001 and into the storage device 1002, and the processor 1001 performs operations to control the communication performed by the device 1004 communication, and at least one of reading and writing data to the storage device 1002 and the auxiliary storage device 1003.

The processor 1001, for example, runs an operating system to control the overall operation of the computer. The processor 1001 may be a central processing unit (CPU) including, for example, an interface to peripheral devices, a control unit, an arithmetic unit, and a register. For example, the above-described control unit 140, control unit 240, and so on can be implemented by the processor 1001.

The processor 1001 is configured to read a program (program code), program module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the memory device 1002, and to perform various types of processing in accordance with this. a program, a program module, data, or the like. A program configured to cause the computer to perform at least some of the operations described in the above embodiment may be used. For example, the control module 140 of the base station 10 shown in Fig. 10 may be implemented by a control program stored in the memory 1002 and executed by the processor 1001. For example, the control module 240 of the user equipment 20 shown in Fig. 11 may be implemented by means of a control program stored in the memory 1002 and executed by the processor 1001. In the above description, various operations are performed by one processor 1001; however, these operations may be simultaneously or sequentially performed by two or more processors 1001. The processor 1001 may be implemented by one or more integrated circuit chips. Said program may be transmitted over a network via a communication line.

The storage device 1002 is a machine-readable storage medium with the ability to write and may contain, for example, at least one of read only memory (eng. Read Only Memory, ROM), permanent erasable memory device (eng. Erasable Programmable ROM, EPROM), electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, EEPROM) and Random Access Memory (RAM). The storage device 1002 may also be referred to as, for example, a register, cache, or main memory (main storage). The storage device 1002 is configured to store, for example, an executable program (program code) and a program module for implementing the method according to an embodiment of the present invention.

The auxiliary storage device 1003 is a writable computer-readable storage medium, and may include, for example, at least one of an optical disc, such as a compact disc (Compact Disc ROM, CD-ROM), a hard disk, a floppy disk, magneto-optical disk (such as CD, digital multifunction disc or Blu-ray Disc (registered trademark)), smart card, flash memory (such as memory card or removable storage), floppy disk (registered trademark floppy disk) and magnetic tape. The above-described storage medium may be, for example, a database, a server, or other suitable storage medium comprising at least one of a storage device 1002 and an auxiliary storage device 1003.

The communication device 1004 is a hardware (receiver and transmitter) for communicating with a computer via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 for implementing at least one of a Frequency Division Duplex (FDD) and a Time Division Duplex (TDD) may include, for example, a high-frequency switch, an antenna switch, filter and frequency synthesizer. For example, a transmitting and receiving antenna, an amplifying module, a transmitting and receiving module, a transmission line interface, and the like may be implemented by the communication device 1004. The transmit and receive module may be implemented with a physical or logical division into a transmit module and a receive module.

The input device 1005 is a means (eg, keyboard, mouse, microphone, switch, button, or sensor) for receiving information from outside. The output device 1006 is a means (eg, display, acoustic emitter, LED) for outputting information. Input device 1005 and output device 1006 may be combined into a single device (eg, a touch panel).

Various devices, such as a processor 1001 and a storage device 1002, are connected to each other by a bus 1007 for exchanging information. Bus 1007 may be a single bus, or the devices may be interconnected by different buses.

Base station 10 and user device 20 may include hardware such as a microprocessor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC), a programmable logic device (Eng. Programmable Logic Device, PLD) and programmable gate array (English Programmable Gate Array, FPGA), and all or part of the functional blocks can be implemented by the specified hardware. For example, processor 1001 may be implemented by at least one of these hardware components.

(Conclusion on this implementation)

As stated above, according to an implementation of the present invention, there is provided a user equipment, comprising: a transmitter configured to transmit a random access preamble or a user equipment identifier to a base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal corresponding to at least one of said random access preamble and user equipment identifier, and, based on said response signal, a downstream signal; and a control module configured to consider the contention resolution successful if the information contained in said downstream signal matches all or part of the identifier of said user device.

In the above configuration, when the CCCH SDU is used in the two-stage random access procedure, the user equipment 20 can perform contention resolution by obtaining the MAC CE based on the random access response. In other words, it is possible to perform conflict resolution in a random access procedure with a possibility of conflict.

The response signal may comprise a distribution of the downstream signal. This configuration allows the user equipment 20 to perform conflict resolution by obtaining the MAC CE.

The response signal may include information indicating the completion of the two-step random access procedure. This configuration allows the user equipment 20 to perform conflict resolution by obtaining the MAC CE.

The response signal and the downlink signal may be received in different frequency domains or different time domains. According to this configuration, flexible placement of the MAC CE can be improved with respect to the user equipment 20.

In addition, according to an implementation of the present invention, there is provided a base station, comprising a receiver configured to receive at least one of a random access preamble and a user equipment identifier from a user equipment in a two-stage random access procedure; a control module, configured to store all or part of the user equipment ID in the information included in the downlink signal; and a transmitter configured to transmit a response signal corresponding to at least one of the random access preamble and the identifier of the given base station, and a downstream signal based on said response signal, to the user equipment.

In the above configuration, when the CCCH SDU is used in the two-stage random access procedure, the user equipment 20 can perform contention resolution by obtaining the MAC CE based on the random access response. In other words, it is possible to perform conflict resolution in a random access procedure with a possibility of conflict.

(Additional explanation of this implementation)

The implementation of the present invention has been described above. However, the disclosed invention is not limited to this implementation, and those skilled in the art will appreciate the possibility of a variety of variations, modifications, changes, substitutions, and the like. In order to simplify the understanding of the present invention, specific numerical examples are used in the description. However, these numerical values are merely examples and any suitable values may be used instead unless otherwise noted. The division into sections in the above description is not fundamental to the present invention, and if necessary, features described in two or more sections can be combined and used. Content described in one section may apply to content described in another section (unless there is a conflict). Boundaries between functional or processing modules in functional diagrams do not necessarily correspond to boundaries between physical components. The function of a plurality of functional modules may be physically performed by a single component. Alternatively, the function of one functional module may be physically performed by multiple components. The order of the steps in the procedures described in this implementation may be changed unless there is a conflict. For convenience in explaining operations, the base station 10 and the user equipment 20 are described using functional diagrams. However, these devices may be implemented in hardware, software, or a combination thereof. The program executed by the processor contained in the base station 10 according to the implementation of the present invention, and the program executed by the processor contained in the user device 20 according to the implementation of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), Read Only Memory (EPROM), Electrically Erasable Read Only Memory (EEPROM), register, hard disk, removable disk, CD-ROM, database, server, or other suitable storage medium information.

Information transfer is not limited to the aspects/implementations described in this disclosure and may be performed by other means. For example, the transmission of information can be performed by physical layer signaling (for example, downlink control information (DCI) and uplink control information (UCI)), upper layer signaling (for example, control layer signaling rad and about resources (Radio Resource Control, RRC), medium access level signaling (Medium Access Control, MAC) or by means of broadcast information (master information block, MIB) and system information block ( The RRC layer signaling may be referred to as an RRC message, and this signaling may be, for example, an RRC connection establishment message and an RRC connection reconfiguration message.

Each of the aspects/implementations described above in this disclosure may apply to at least one of LTE, LTE-Advanced (LTE-Advanced, LTE-A), SUPER 3G, IMT-Advanced, fourth generation (4G) mobile communication system, 5G mobile communication system, Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000 , Ultra Mobile Broadband (UMB) system, IEEE 802.11 (Wi-Fi, registered trademark), IEEE 802.16 (Wi-MAX, registered trademark), IEEE 802.20, short distance communication system using broadband Ultra-Wide Band (UWB) signals, Bluetooth (registered trademark), to a system using other suitable systems, and to a next generation system, functionality which was developed on the basis of these systems. In addition, each aspect/implementation described in this disclosure may apply to combined systems (eg, a combination of at least one of LTE and LTE-Ac 5G).

In the order of processing, sequence, flowchart, and the like of each aspect/implementation described herein, the order may be changed unless there is a conflict. For example, the tools described in this disclosure present elements of the various steps using the order provided as an example, and are not limited to the particular order presented.

The particular operation described herein as being performed by base station 10 may be performed by the superior node of that base station. Obviously, in a network containing one or more network nodes, including the base station 10, various operations performed to communicate with the user device 20 may be performed by at least one of the base station 10 and a network node other than the base station. 10 (for example, but not limited to an MME or S-GW node). In the above description, one network node other than the base station 10 is described as an example, but the other network node may be a combination of many other network nodes (eg, MME and S-GW).

The information, signal, or the like described in the present disclosure may be transmitted from an upper layer (or lower layer) to a lower layer (or higher layer), and may be received or transmitted through a plurality of network nodes.

Information received or transmitted, or the like. may be stored in a specific location (eg, in memory) or may be stored in an ordered manner using a control table. Information received or transmitted, or the like. may be overwritten, refined or modified.

The transmitted information or the like may be deleted. Received information or the like. can be transferred to another device.

The check in the present disclosure may be performed based on a value represented by a single bit (0 or 1), based on a boolean value (true or false), or based on a comparison with a numeric value (eg, comparison with a predetermined value).

Software, whether called a program, an internal program, an intermediate level program, microcode, a hardware description language or otherwise, should be interpreted in a broad sense, including an instruction, a set of instructions, a code, a code segment, a program code, a program, a subroutine, a program module, an application, an application program, a software package, an object, an executable file, a thread of execution, a procedure, a function, and the like.

A program, instruction, information, or the like may be transmitted or received via a transmission medium. For example, when a program is transmitted from a website, server, or other remote source using at least one of the wired media (such as coaxial cable, optical cable, twisted-pair cable, and Digital Subscriber Line (DSL) )) and wireless media (eg, infrared and microwaves), then at least one of these wired media and wireless media is included in the definition of transmission medium.

The information, signal, and the like described in this disclosure may be represented using any of a variety of different technologies. For example, data, instruction, command, information, signal, bit, symbol, code sequence (chip), etc., which may be referred to in this disclosure may be represented by voltage, current, electromagnetic wave, magnetic field, or magnetic particle. , an optical field or a photon, or any combination of the above.

Terms described in this disclosure and terms necessary for understanding this disclosure may be replaced by terms having the same or similar meaning. For example, at least one of the channel and the symbol may be a signal (signaling). The signal can be a message. The elementary carrier (EC) may be referred to as a frequency carrier, cell, frequency carrier, or the like.

The terms "system" and "network" are used interchangeably in this disclosure.

The information, parameter, and the like described in the present disclosure may be represented using an absolute value, a relative value with respect to a predetermined value, or other relevant information. For example, the radio resource may be indicated by an index.

The names used for the parameters described above are not limiting in any way. In addition, a mathematical expression or the like that uses these parameters may be different from those explicitly disclosed in the present disclosure. Since the various channels (eg, PUCCH and PDCCH) and information items may be called by any valid names, the various names that denote these channels and information items are not limited in any respect.

In this disclosure, terms such as "base station (BS)", "wireless base station", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB) )”, “access point”, “transmitting point”, “receiving point”, “transmitting/receiving point”, “cell”, “sector”, “cell group”, “carrier”, “elementary carrier”, etc. . can be used interchangeably. The base station may be referred to as a macro cell, small cell, femto cell, pico cell, or the like.

The base station may serve one or more (eg, three) cells. When a base station serves many cells, the entire coverage area of that base station can be divided into many smaller areas, in each of which communication services can be provided through subsystems of the base station, for example, small base stations for premises (remote radio units, English Remote Radio Head ). The term "cell" or "sector" refers to a part or all of a coverage area in which at least one of a base station and a base station subsystem provides communication services.

In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably.

In some cases, a person skilled in the art may refer to a mobile station as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or any other suitable term.

At least one of the base station and the mobile station may be called a transmitter, a receiver, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile unit or the mobile unit itself. Said movable object may be a vehicle (examples are a car and an airplane), may be a movable object that moves without a pilot on board (examples are a drone and an automated vehicle), and may be a robot (human-operated type or unmanned type). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (LOT) device, such as a sensor.

The base station in the present disclosure may be referred to as a user terminal. For example, each aspect/implementation described in this disclosure may, instead of a configuration in which communication is between a base station and a user terminal, be applied to a configuration in which communication is between a plurality of user devices 20 (which may be referred to, for example, as inter-device communication). (Device-to-Device, D2D) and communication between the vehicle and a wide range of objects (Vehicle-to-Everything, V2X).In this case, the user device 20 may contain a functional element contained in the above-described base station 10. The words "uplink" and "downlink" may be interpreted as referring to terminal-to-terminal communication (eg, as "hands-on side").For example, uplink, downlink, and the like may be referred to as a direct link.

Similarly, in the present disclosure, a user terminal may be referred to as a base station. In this case, the base station may contain a functional element contained in the above-described user terminal.

The content of the terms "determination" and "decision making" used in this disclosure may include various operations. The terms “determining” and “decision making” may include, for example, determining and deciding for operations of judgment, calculation, calculation, processing, inference, research, search (search and query) (for example, search in a table, database or other data structure) and validation. In addition, the terms “determining” and “decision making” may include the definition and decision making for receive (e.g., receive information), transmit (e.g., transmit information), input, output, and access (e.g., access to data in memory) operations. . The terms "definition" and "decision making" may contain definition and decision making for disambiguation, selection, selection, fact-finding, and comparison operations. In other words, the terms "determination" and "decision making" can contain the definition and decision for any operation. In addition, the term "determining" (or "making a decision") can be expressed, for example, as "speculation", "expectation" and "consideration".

The terms "connected" and "associated" or any of their variations mean any direct or indirect connection or connection between two or more elements, including the presence of one or more intermediate elements between two elements that are "connected" or "connected" to each other . The relationship or connection between elements can be physical, logical, or a combination of both. The term "connection" can be interpreted, for example, as "access". When the terms "connected" or "connected" are used in this disclosure, two elements may be considered to be "connected" or "connected" to each other using one or more electrical conductors, cables, printed electrical connections, or any combination thereof, and, in as a few non-limiting and non-exhaustive examples, using electromagnetic energy or the like having a wavelength from the radio frequency band, microwave band, and light band (both visible and invisible).

The term "Reference Signal" may be abbreviated as RS and, depending on the applicable standard, the reference signal may also be referred to as the pilot.

The expression "based on" as used in this disclosure does not mean "only based on" unless otherwise indicated. In other words, the expression "on the basis of" means both "on the basis of" and "at least on the basis of".

In the present disclosure, any reference to elements using the designations "first", "second", etc., as a rule, does not limit the number or order of these elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, referring to the first and second element does not imply that only two elements are used, or that the first element must in any way precede the second element.

The term "means" in the configuration of each of the devices described above may be replaced by "module", "circuit", "device", or the like.

When terms such as "include", "comprising" and variations thereof are used in the present disclosure, these terms are to be understood in the sense of including, similar to the meaning of the term "comprising". In addition, the conjunction "or" in the present disclosure should not be understood to mean an exclusive disjunction.

A radio frame may be formed by one or more frames in the time domain. Each of these one or more frames in the time domain may be referred to as a "subframe". Further, a subframe in the time domain may be formed by one or more slots. A subframe may be a time slot of a fixed duration (eg, 1 ms) independent of numerology.

Numerology can be referred to as a communication parameter applied to at least one of the transmission and reception of a signal or channel. Numerology may indicate, for example, at least one of Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI , radio frame configuration, special filtering processing performed by the transceiver in the frequency domain, special windowing performed by the transceiver in the time domain.

A slot in the time domain may be formed by one or more symbols (orthogonal frequency division multiplexing (OFDM) symbols), single carrier and single carrier symbols. Frequency Division Multiple Access, SC-FDMA), etc.). The slot can be a temporary element depending on numerology.

A slot may contain a plurality of mini-slots. Each mini-slot in the time domain may be formed by one or multiple symbols. A mini-slot may be referred to as a sub-slot. A mini-slot can be formed with fewer symbols than a slot. PDSCH (or PUSCH) transmission in a tile larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmission using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

The radio frame, subframe, slot, and symbol are the time units in which the signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other appropriate names.

For example, one subframe, multiple consecutive subframes, one slot, or one mini-slot may be referred to as a Transmission Time Interval (TTI). Thus, at least one of the subframe and the TTI may be a subframe (1 ms) of an existing LTE system, an interval shorter than 1 ms (eg, 1 to 13 symbols), or an interval longer than 1 ms. An element representing a TTI may be referred to as a slot or mini-slot instead of a subframe.

TTI denotes, for example, the smallest scheduling time element in a radio communication. For example, in the LTE system, when the base station performs scheduling for each user equipment 20 to allocate a radio resource (bandwidth, transmission power, or the like that the user equipment 20 is allowed to use), TTI is used as the scheduling element. The definition of TTI is not limited to this.

The TTI may be a transmission time element of a channel-encoded data packet (transport block), a code block, a codeword, or the like, and may be a processing element in scheduling, link adaptation, or the like. Given a TTI, the time interval (eg, number of symbols) for which a transport block, code block, codeword, or the like is actually mapped may be shorter than this TTI.

When a TTI is referred to as one slot or one mini-slot, the minimum scheduling element may be one or more TTIs (ie, one or more slots or mini-slots). The number of slots (or mini-slots) contained in the minimum scheduling time element may be adjustable.

A TTI with a time duration of 1 ms may be referred to as a regular TTI (TTI in LTE Releases 8-12), long TTI, normal subframe, long subframe, slot, and the like. A TTI that is shorter than a regular TTI may be referred to as a short TTI, a short TTI, a partial TTI (or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.

A long TTI (eg, a normal TTI or subframe) may be replaced by a TTI with a time duration greater than 1 ms, and a short TTI (eg, an abbreviated TTI) may be replaced by a TTI with a duration shorter than the long TTI and greater than or equal to 1 ms.

A resource block (RB) is a resource allocation element in the time domain and in the frequency domain, and in the frequency domain, it may contain one subcarrier or a plurality of subcarriers consecutively without gaps. The number of subcarriers contained in a resource block may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers contained in a resource block may be determined based on the numerology.

A resource block time domain may contain one or more symbols and may be one slot, one mini-slot, one subframe, or one TTI in length. One TTI, one subframe, and so on. may be formed by one or more resource blocks.

One or more resource blocks (RBs) may be called a Physical Resource Block (Physical RB, PRB), a Sub-Carrier Group (SCG), an Element Group (REG), a PRB pair, an RB pair, and etc.

A resource block can be formed by one or more resource elements (English Resource Element, RE). For example, one resource element may be a radio resource region for one subcarrier and one symbol.

The Bandwidth Part can also be called, for example, a partial band) may be a subset of consecutive uninterrupted common resource blocks (common RBs) defined for some numerology on some carrier. The common RB may be defined by the RB index with respect to the common reference point on that carrier. PR B may be defined by a partial band (BWP) and may be numbered in that BWP.

A BWP may contain an upstream BWP and a downstream BWP. One or more BWPs may be configured for a UE on a single carrier.

At least one of the configured BWPs may be active, and the UE may assume that the given signal/channel is not transmitted or received outside of this active BWP. The terms "cell" and "carrier" in the present disclosure may be referred to as "BWP".

The above configurations of a radio frame, subframe, slot, mini-slot, symbol, and the like. are just examples. For example, various changes are possible with respect to the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots contained in a slot, the number of symbols and RBs contained in a slot or mini-slot, the number of subcarriers contained in a RB, as well as the number of characters in the TTI, character length, and cyclic prefix (CPU) length.

In the present disclosure, when, for example, as a result of translation, an article is added to a noun, for example, in English, "a", "an" and "the", it is understood that the noun following this article can also be understood in the plural. .

In the present disclosure, the expression "A and B are different" may mean "A and B are different from each other." This expression can also mean "both A and B are different from C". The terms "separate", "combined", etc. can be interpreted similarly.

Aspects/implementations described in this disclosure may be used individually, may be combined, and may change during execution. In addition, transmission of predetermined information (eg, transmission of an indication that "this is X") is not limited to explicit execution, and may be performed implicitly (eg, by not performing transmission of this predetermined information).

In the present disclosure, UE ID and C-RNTI are examples of user equipment identifier. MsgB is an example of a response signal.

The present invention has been described in detail above. Despite this, the specialist should be obvious that the present invention is not limited to the implementations presented in this disclosure. The present invention may be embodied with changes and modifications without departing from the spirit and scope of the present invention as defined by the claims. Accordingly, the description in the present disclosure is intended to be illustrative and is not intended to limit the present invention in any way.

Description of reference symbols

10 base station

110 transmitter

120 receiver

130 tuning module

140 control module

20 user device

210 transmitter

220 receiver

230 tuning module

240 control module

1001 processors

1002 storage device

1003 auxiliary storage device

1004 communication device

1005 input device

1006 output device

Claims (18)

1. Terminal containing: a transmitter configured to transmit the random access preamble and terminal identification information to the base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal in a two-stage random access procedure; and a control module configured to consider the contention resolution successful if the information contained in the specified response signal matches at least part of the information for identifying the terminal, wherein the transmitter is configured to distinguish between a resource position used to transmit a random access preamble in a two-stage random access procedure from a resource position used to transmit a random access preamble in a four-stage random access procedure. 2. A wireless communication system, comprising: a terminal and a base station, the terminal comprising: a transmitter configured to transmit the random access preamble and terminal identification information to the base station in a two-stage random access procedure; a receiver configured to receive, from said base station, a response signal in a two-stage random access procedure; and a control module configured to consider the contention resolution successful if the information contained in the specified response signal matches at least part of the information for identifying the terminal, wherein the transmitter is configured to distinguish the resource position used to transmit the random access preamble in the two-round random access procedure from the resource position used to transmit the random access preamble in the four-round random access procedure, and base station contains: a receiver configured to receive, from said terminal, a random access preamble and terminal identification information in a two-stage random access procedure; and a transmitter configured to send a response signal to said terminal in a two-stage random access procedure. 3. A communication method performed by a terminal, including: transmitting the random access preamble and terminal identification information to the base station in a two-stage random access procedure; receiving from said base station a response signal in a two-stage random access procedure; determining that the contention resolution is successful when the information contained in said response signal matches at least a portion of the information for identifying the terminal, and distinguishing a resource position used for transmitting a random access preamble in a two-stage random access procedure from a resource position used for transmitting a random access preamble in a four-stage random access procedure.

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