[go: up one dir, main page]

WO2016163642A1 - Appareil et procédé de communication utilisant une procédure d'accès aléatoire - Google Patents

Appareil et procédé de communication utilisant une procédure d'accès aléatoire Download PDF

Info

Publication number
WO2016163642A1
WO2016163642A1 PCT/KR2016/001728 KR2016001728W WO2016163642A1 WO 2016163642 A1 WO2016163642 A1 WO 2016163642A1 KR 2016001728 W KR2016001728 W KR 2016001728W WO 2016163642 A1 WO2016163642 A1 WO 2016163642A1
Authority
WO
WIPO (PCT)
Prior art keywords
message
preamble
terminal
random access
index
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2016/001728
Other languages
English (en)
Korean (ko)
Inventor
성단근
장한승
김수민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Advanced Institute of Science and Technology KAIST
Original Assignee
Korea Advanced Institute of Science and Technology KAIST
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
Priority claimed from KR1020150130823A external-priority patent/KR101678792B1/ko
Priority claimed from KR1020160020391A external-priority patent/KR101776460B1/ko
Application filed by Korea Advanced Institute of Science and Technology KAIST filed Critical Korea Advanced Institute of Science and Technology KAIST
Priority to US15/502,857 priority Critical patent/US10231196B2/en
Publication of WO2016163642A1 publication Critical patent/WO2016163642A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a communication method between terminals for performing wireless communication and / or between a terminal and a base station, and more particularly, to a communication method of devices performing a random access (RA) process for communication.
  • RA random access
  • ICT Information and Communications Technologies
  • M2M Machine to Machine
  • IoT Internet of Things
  • the cellular communication method maintains disconnection from the network except for message transmission for energy saving and initiates communication through random access when communication with the network is required.
  • communication nodes will often transmit relatively small data such as device status messages, sensing data, and smart metering data. If communication is performed after allocating a separate resource, the communication overhead may be large compared to the data transmission amount.
  • a new random access procedure may be performed in parallel with and / or in place of a conventional random access scheme, and devices may transmit data more efficiently in this process.
  • a new random access procedure may be performed in parallel with and / or in place of a conventional random access scheme, and devices may transmit data more efficiently in this process.
  • a user equipment including a processor and performing a random access procedure with a base station (e-NodeB: E-UTRAN Node B, or also known as Evolved Node B).
  • the terminal may be implemented at least temporarily by the processor.
  • the terminal determines a transmittable message size corresponding to a physical random access channel according to a specified communication scheme with the base station, and sets a message to correspond to the message size and from the message to the preamble index and at least one message index It may include an operation unit for calculating each and an encoder for encoding each of the preamble index and the at least one message index to transmit to the base station.
  • the determiner may determine the transmittable message size according to the Zadoff weight sequence length corresponding to the designated communication scheme, the number of preamble sequences, and the number of message root index functions.
  • the determination unit determines to transmit the increased message using a plurality of subframes corresponding to the physical random access channel. Can be.
  • the operation unit may calculate at least one message root index different from the preamble root index by using each of at least one message root index function having the preamble index as an independent variable.
  • the operation unit repeatedly extracts at least one message bit string corresponding to each of the at least one message root index from the set start bit of the message, and extracts a preamble bit string from the remaining message. Can be.
  • the encoder may further include a preamble sequence corresponding to each of the at least one message root index and the preamble sequence cyclically shifting a Zadoff weight sequence corresponding to a preamble root index by a constant value corresponding to the preamble index.
  • the weight sequence may be generated to transmit each message sequence cyclically shifted by a sum of a constant value corresponding to the preamble index and each of the at least one message index, and transmitted to the base station.
  • the terminal further includes a selector for selecting one of a preamble transmission mode and a message simultaneous transmission mode, and when the selection unit selects the preamble transmission mode, the encoder encodes the preamble index. And transmit to the base station.
  • a terminal for recognizing a preamble collision and performing a back off in a random access second step determines whether to receive a random access response message corresponding to the transmitted sequence, and if the random access response message is not received according to the result of the determination, performs a back off corresponding to a preset time interval. It may include a control unit to perform.
  • the transmitted sequence may include a preamble and at least one message.
  • the controller may transmit an additional message to the base station by using an uplink resource included in the random access response message.
  • a base station including a processor and performing a random access procedure with a terminal.
  • the base station may be at least temporarily implemented by the processor.
  • the base station may determine whether the preamble collides in the random access first step by using the correlation value of the message index associated with the preamble.
  • the base station uses the operator to calculate the received preamble index using the sequence received from the terminal and the Zadoff weight sequence associated with the preamble and the Zadov weight sequence associated with the message root index determined by the preamble index. It may include a determination unit for determining whether or not the preamble collides. The determination unit calculates a correlation value between the received sequence and a Zadoff weight sequence associated with the message root index, and determines collision of the preamble when there are two or more peaks of the correlation value exceeding a preset threshold. Can be.
  • the base station may further include a decoder for decoding the message transmitted by the terminal through the random access procedure using the preamble index and the message index.
  • the operation unit may calculate the message index by using the Zadoff weight sequence associated with the received sequence and the message root index.
  • a base station for detecting connection between the preamble index and the message index at the same time to implement connectionless data transmission and reception with the terminal.
  • the base station calculates a correlation value corresponding to a preamble index and a correlation value corresponding to each of at least one message index using the sequence received from the terminal, a correlation value corresponding to the preamble index, and the at least one message.
  • the apparatus may include a detector configured to detect each of the preamble index and the at least one message index based on a correlation value corresponding to each index.
  • the operation unit calculates at least one message root index determined according to the preamble index by using at least one message index function, and calculates a Zadoff weight sequence corresponding to the at least one message root index.
  • the correlation value corresponding to each of the at least one message index may be calculated.
  • the detection unit compares the position number corresponding to the peak of the correlation value corresponding to the preamble index and the position number corresponding to each peak of the correlation value corresponding to the at least one message index. Each message index can be detected.
  • the decoder may further include a decoder for decoding the message transmitted by the terminal through the random access procedure using the at least one message index and the preamble index.
  • the decoder may identify a predetermined prefix bit in the decoded message and determine an operation mode of the terminal according to the prefix bit.
  • the decoder may also use a random access resource to transmit a subsequent message in a first mode, a second mode in which the message is transmitted and terminated in a single frame, and a third mode in which the subsequent message is transmitted through an additional frame. At least one may be determined as the operation mode. More specifically, when the operation mode is the first mode, the decoded message may include a scheduling request including resource block size information for transmitting the subsequent message. Meanwhile, when the operation mode is the third mode, the decoder may determine that the message is part of an entire message transmitted by the terminal, and merge subsequent messages decoded in the additional frame.
  • a method of controlling an access load by a base station performing a random access procedure with a plurality of terminals includes detecting at least one message index corresponding to each preamble index in a plurality of sequences received, calculating a connection load corresponding to the number of the detected at least one message index, and preset thresholds and the Comparing the connection load may include controlling the connection period of the physical random access channel according to the comparison result.
  • the controlling of the access cycle may include setting a larger T RACH corresponding to the access cycle when the access load is smaller than the threshold, and when the access load is larger than the threshold. Setting the T RACH corresponding to the period to be smaller.
  • a user equipment (UE) for random access to a base station eNodeB: E-UTRAN Node B, or also known as Evolved Node B
  • a terminal uses a communication interface to communicate with an external device, a laptop computer, a mobile phone, a smartphone, a tablet PC, a mobile internet device (MID), and a personal digital assistant (PDA). It may be implemented in various forms such as a digital assistant, an enterprise digital assistant, a handheld console, an e-book, or a smart device.
  • the terminal includes at least one processor and may be implemented at least temporarily by the at least one processor.
  • the terminal determines whether the received random access response message (Random Access Response) includes the preamble transmitted by the terminal and the time alignment information associated with the terminal and the random access response according to the result of the determination It may include a control unit for adjusting the transmission power of the data transmitted through the uplink resource grant included in the message.
  • Random Access Response Random Access Response
  • the controller may transmit the data using a predetermined reference power.
  • the controller uses the data changed by a predetermined size from a predetermined reference power. Can be transmitted. Specifically, the controller may transmit the data by using the changed power that increases or decreases the predetermined reference power by the predetermined magnitude.
  • a terminal for adjusting transmission power according to the number of other terminals using the same uplink resource determines a number of random access response messages including the same uplink resources as the uplink resources associated with the terminal and the transmission power of the data transmitted through the uplink resources according to the determination result. It may include a control unit for adjusting the.
  • the uplink resource associated with the terminal may be included in a random access response message including a preamble transmitted by the terminal and time alignment information associated with the terminal.
  • the controller may transmit the data using a predetermined reference power.
  • the determination unit when it is determined that a plurality of random access response messages including uplink resources associated with the terminal has been received, the determination unit each time alignment included in the plurality of random access response messages Information and time alignment information associated with the terminal may be compared.
  • the controller may transmit the data by using a power changed by a predetermined size from a predetermined reference power based on a result of the comparison. Specifically, the controller calculates the number of time alignment information having a value larger than the time alignment information associated with the terminal, and uses the power changed by a predetermined size from the predetermined reference power based on the number. Can transmit
  • a base station for identifying a type of a terminal performing random access and generating a random access response message according to whether a preamble collides.
  • the base station includes at least one processor, and may be implemented at least temporarily by the at least one processor.
  • the base station may be configured to identify whether a terminal associated with the preamble is a fixed terminal or a mobile terminal using the received preamble, and has a value equal to an index associated with the preamble.
  • a generation unit configured to determine a number of times the preamble has been received, and a generation unit configured to generate a random access response message according to a result of the identification and a result of the determination.
  • the identification unit may identify whether the terminal is a fixed terminal or a mobile terminal according to the index size of the preamble.
  • the identification unit may identify whether the terminal is a fixed terminal or a mobile terminal according to a root index used for decoding the preamble.
  • the generation unit when it is determined that the terminal is identified as a fixed terminal and two preambles having the same value as the index have been received, the generation unit includes the index, the location information of the uplink resource, and the The random access response message including time alignment information indicating a smaller value among two preambles may be generated.
  • the generation unit may perform a back off.
  • the generation unit may perform a back off.
  • the generator when it is determined that one preamble having the same value as the index is received, the generator may group the first preamble associated with the index with the second preamble. In addition, the generation unit may allocate the same uplink resource to the first terminal associated with the first preamble and the second terminal associated with the second preamble. The generation unit may group the second preamble and the first preamble in which one preamble having the same value as the second index associated with the second preamble is received.
  • determining whether the received random access response message includes the preamble transmitted in advance and the time alignment information associated with the transmission of the preamble and according to the result of the determination, the random access response message There is provided a random access method comprising adjusting a transmission power of data transmitted through an included uplink resource.
  • a random access method comprising generating a random access response message according to the result of the identification and the result of the determination.
  • FIG. 1 is a flowchart illustrating a random access procedure of a terminal and a base station according to an embodiment.
  • FIG. 2 is a flowchart illustrating a random access procedure using a single frame of a terminal and a base station according to an embodiment.
  • 3A and 3B are flowcharts illustrating a random access procedure using dual frames of a terminal and a base station according to an embodiment.
  • 4A and 4B are flowcharts illustrating a random access procedure using multiple frames of a terminal and a base station according to an embodiment.
  • FIG. 5 is a flowchart illustrating a random access procedure of a terminal and a base station according to another embodiment.
  • FIG. 6 is a block diagram illustrating a terminal according to an embodiment.
  • FIG. 7 is an exemplary diagram illustrating a method of determining at least one message index and a preamble index according to an embodiment.
  • 8A and 8B are flowcharts illustrating a communication method in which a terminal performs a random access procedure to a base station according to an embodiment.
  • FIG. 9 is a block diagram illustrating a terminal according to another embodiment.
  • FIG. 10 is a block diagram illustrating a base station according to an embodiment.
  • 11 is a graph illustrating a process of detecting a message index according to an embodiment.
  • FIG. 12 illustrates an example of a method of determining a first message index, a second message index, and a preamble index to decode a message, according to an exemplary embodiment.
  • FIG. 13 is a block diagram illustrating a base station according to another embodiment.
  • 14A and 14B are graphs illustrating a process of detecting a preamble collision according to an embodiment.
  • 15 is a flowchart illustrating a method of detecting a preamble collision by a base station using a sequence transmitted from a terminal in a random access procedure according to an embodiment.
  • 16 is a flowchart illustrating a communication method of a base station for controlling a connection load using a detected message index according to an embodiment.
  • 17 is a flowchart illustrating a random access procedure of a terminal and a base station according to an embodiment.
  • FIG. 18 is a flowchart illustrating a random access procedure of a base station according to an embodiment.
  • 19 is a flowchart illustrating a random access procedure of a terminal according to an embodiment.
  • 20 is a block diagram illustrating a terminal according to an embodiment.
  • 21 is a flowchart illustrating a random access procedure of a terminal according to another embodiment.
  • 22 is a block diagram illustrating a base station according to an embodiment.
  • a terminal may transmit not only a preamble but also a message together with a physical random access channel (PRACH) to be transmitted to a base station.
  • the message may be scheduling request information for additional data transmission.
  • the message may be an alarm message for notifying the base station of an emergency based on the sensed data.
  • step 110 the terminal transmits a message including a scheduling request to the base station along with the preamble using a physical random access channel and in step 120 is allocated a resource from the base station. Subsequently, using the resource in step 130, the terminal may transmit UE ID (User Equipment Identification) information and a desired message to the base station to increase transmission efficiency.
  • UE ID User Equipment Identification
  • the terminal may transmit a transmission sequence including a preamble and a message to the base station.
  • the terminal may set a specific bit of the message as a prefix bit.
  • the prefix bits are bits that enable the base station to identify and determine application techniques associated with the decoded message.
  • the prefix bit may be associated with a scheduling request.
  • the terminal transmits a message including the size information of the desired resource block together with the prefix bit.
  • the size of the resource block is related to the size of subsequent messages to be transmitted later.
  • the scheduling request message is disclosed as an embodiment of the message transmitted with the preamble in step 110, the message may be changed into various types of messages that can be transmitted according to the resources of the physical random access channel.
  • the base station transmits a random access response message to the terminal.
  • the base station may calculate a second correlation value between the received sequence and the second Zadoff weight sequence corresponding to the first message.
  • the base station may compare the magnitude of the second correlation value with a threshold to determine whether the random access scheme of the terminal is a conventional scheme or a new simultaneous message transmission scheme.
  • the base station may determine that the message is associated with the scheduling request based on the decoded prefix. Accordingly, the base station may allocate a resource block in response to the scheduling request.
  • the base station may transmit an ACK for the message to the terminal.
  • the base station may transmit uplink resource grant information to the node through a random access response message.
  • the terminal may transmit data using the PUSCH allocated from the base station.
  • the terminal may transmit the desired message and the terminal identifier together.
  • the base station may receive data including a desired message and a terminal identifier from the terminal.
  • the base station may transmit an ACK for the data to the terminal.
  • the transmission may be performed through a physical downlink shared channel (PDSCH).
  • the base station may transmit a contention resolution message to the terminal.
  • PDSCH physical downlink shared channel
  • 2 is a flowchart illustrating a random access procedure using a single frame of a terminal and a base station according to an embodiment. 2 illustrates a process of transmitting and receiving a message using resources corresponding to the first and second stages in the random access procedure. Improvement of transmission efficiency can be expected in that small data can be transmitted and received in a random access procedure without using a separate PUSCH resource.
  • the terminal may transmit a transmission sequence including the preamble and the message to the base station.
  • the message bit may include at least one of a prefix, a terminal identifier, and a desired message.
  • the prefix may indicate that all of the message has been transmitted and there is no further message transmission thereafter.
  • the terminal identifier may use location information such as latitude and longitude of the machine node. Since there is no need to assign another special unique terminal identifier separately, it can be applicable to more machine nodes and describe high applicability. For example, a location information of a wild animal may be set as a terminal identifier, and state information may be written in a desired message to implement a network capable of quick location and status determination.
  • the Logical ID designated by the base station may be used as the terminal identifier.
  • Comprising a space group in a cell can provide a terminal identifier to many nodes and terminals because the same Logical ID can be reused between different space groups.
  • the base station may set a group for each TA range by specifying a range of Timing Alignment (TA) values.
  • TA Timing Alignment
  • Each node belongs to each corresponding TA group.
  • the base station can assign the same Logical ID to nodes belonging to different TA groups to reuse the Logical ID and provide a terminal identifier to many nodes.
  • the base station may transmit a random access response message to the terminal.
  • the random access response message may not include the uplink resource grant.
  • the base station may transmit an ACK of the message received in step 210 to the terminal.
  • 3A and 3B are flowcharts illustrating a random access procedure using dual frames of a terminal and a base station according to an embodiment. 3A and 3B, similarity exists to FIG. 2 in that a random access procedure transmits and receives a message using resources corresponding to the first and second steps. However, there is a difference from the embodiment described in FIG. 2 in that data is transmitted in two frames instead of one frame.
  • the terminal may transmit a transmission sequence including a preamble and a message to the base station.
  • the message bit may include a first prefix.
  • the terminal transmits a part of the message through the first frame and the subsequent message through the second frame.
  • the first prefix included in the message bit transmitted in step 310 may indicate a communication method of transmitting a part of the entire message and later transmitting a subsequent message. More specifically, the first prefix may indicate the number of frames in which the entire message is divided.
  • the base station may decode the first prefix to determine how many additional frames should be received for the entire message to be delivered from the terminal.
  • the message bit in step 310 may include a terminal identifier.
  • the terminal may transmit the entire desired message in step 330.
  • the message bit in step 310 may include part of the terminal identifier and part of the desired message.
  • the terminal may transmit the remaining part of the terminal identifier and the remaining part of the desired message to the base station in step 330.
  • the base station may decode the message by merging the messages received in steps 310 and 330.
  • the base station can perform an effective matching between the terminal identifier and the desired message.
  • the base station may use the TA (Timing Alignment) information used in step 310 and step 330 to perform the matching of the message and the terminal consisting of a double frame.
  • the base station may transmit a random access response message and an ACK to the terminal.
  • FIG. 3A may transmit a random access response message and an ACK to the terminal as in steps 320 and 340.
  • the random access response message may not include the uplink resource grant.
  • the base station may transmit an ACK of the message received in step 310 to the terminal.
  • the terminal may transmit a transmission sequence including the preamble and the message to the base station.
  • the message bit may include a second prefix.
  • the second prefix may indicate a communication method for transmitting the rest of the entire message and ending the transmission.
  • the base station may transmit a random access response message to the terminal.
  • the base station may transmit an ACK of the message received in step 330 to the terminal.
  • the terminal may transmit a transmission sequence including a preamble and a message to the base station.
  • the message bit may comprise a first prefix, which may indicate a communication method that sends a portion of the entire message and then a subsequent message.
  • the terminal may transmit a transmission sequence including the preamble and the message to the base station.
  • the message bits may include a second prefix.
  • the second prefix may indicate a communication method for transmitting the rest of the entire message and ending the transmission.
  • the base station may transmit a random access response message to the terminal.
  • the base station may transmit an ACK of the message received in steps 350 and 360 to the terminal.
  • the communication method described in FIG. 3B differs from the communication method described in FIG. 3A. The difference is that in step 370, the base station transmits the random access response message and the ACK to the terminal after receiving the second prefix indicating that the entire transmission of the message is completed. In comparison with the case of FIG. 3A, the base station will transmit an ACK to the terminal once when the second prefix is decoded.
  • the terminal can perform connectionless data transmission and reception without consuming control plane resources for connection, and the base station likewise transmits an ACK only once when transmission and reception of all data is completed. You will save resources.
  • steps 401, 403, 405, 407, and 409 are performed by the terminal to transmit a message and a preamble using resources of a PRACH for a random access procedure.
  • step 402 step 404, step 406, step 408 and step 410 is a step in which the base station transmits a random access response message with an ACK for the message sent to the terminal.
  • the terminal may transmit a message bit including the first prefix to the base station.
  • the first prefix may indicate that the terminal identifier is transmitted at the beginning of the message transmission.
  • the terminal may transmit a message bit including the second prefix to the base station.
  • the second prefix may represent a communication method for delivering a continuous message.
  • the terminal may transmit different prefixes to the base station, respectively. Each of these prefixes may represent a posterior relationship of successive messages.
  • the terminal may transmit a message bit including the third prefix to the base station.
  • the third prefix may indicate the end of the transmission of consecutive messages.
  • steps 411, 412, 413, 414, and 415 may be performed by the terminal using a PRACH resource for a random access procedure. And transmitting the preamble.
  • step 416 differs from FIG. 4A.
  • the base station will send a random access response message and ACK to the terminal after receiving the prefix indicating that transmission of the entire message is completed, as in step 370.
  • the terminal may transmit a transmission sequence including a preamble and a message to the base station.
  • the terminal may select and use any preamble corresponding to the designated communication scheme with the base station. More specifically, given the length N ZC of the Zadoff Chu sequence and the cyclic shifting size Ncs of the preamble cyclic shifting size Ncs, the number N PA of the preamble sequences that the terminal can transmit to the base station is represented by the following equation. Can be determined according to one.
  • a random access response message corresponding to the preamble will be transmitted from the base station to the terminal using a physical downlink shared channel (PDSCH). Then, when the message received by the base station using the physical uplink shared channel (PUSCH) from the terminal is not decoded, the base station may recognize that there is a collision in the preamble used by the terminal.
  • PDSCH physical downlink shared channel
  • the base station transmits a random access response message to the terminal and additionally allocates a part of resources of the physical uplink shared channel to the terminal to recognize the collision of the preamble.
  • the conventional random access procedure needs to be improved when considering the wireless network environment in which the number of nodes will increase rapidly in that it uses unnecessary control plane resources and recognizes the collision of the preamble only through failure of decoding the message.
  • the base station may detect the preamble index using the received sequence.
  • the base station may further detect the message index using the received sequence.
  • the base station may determine whether the preamble collides using the detected number of message indexes. More specifically, when the number of detected message indexes is plural, the base station may determine that the plurality of terminals use the same preamble and detect collision of the preamble. If a collision of the preamble is detected, the base station may not transmit a random access response message for the preamble.
  • the process of the base station detecting the message index will be described in more detail.
  • the terminal may determine whether the random access response message corresponding to the preamble transmitted in advance. If it is determined that the random access response message is not received, the terminal may perform a back off corresponding to a preset time interval.
  • the terminal uses the uplink resource included in the random access response message in the same manner as the conventional random access scheme to request a scheduling request message. May be transmitted to the base station.
  • the terminal 600 may transmit a message to the base station using a physical random access channel during the random access procedure. Short messages can be sent and received together in the random access process, thus increasing transmission efficiency.
  • the terminal 600 may include a determiner 610, a calculator 620, and an encoder 630.
  • the determination unit 610 may determine the transmittable message size corresponding to the physical random access channel according to the designated communication method with the base station. More specifically, the determiner 610 may determine the size of a message that can be transmitted based on random access information received from the base station.
  • the random access information includes the size of the preamble cyclic shift Ncs, the number of preamble sequences N PA , the length of the Zadoff weight sequence N ZC , the preamble
  • Root Index r and Message Root Index Function Set
  • N is the number of elements in the set of message root index functions.
  • the determiner 610 may determine the size of a message that can be transmitted based on Equation 2 below.
  • the decision unit 610 may determine that a message size of 15 bits can be transmitted at present. have.
  • the determination unit 610 may calculate a transmittable message size corresponding to N PA and N ZC as shown in Table 1 below.
  • the time axis length of the PRACH should be configured using a plurality of subframes.
  • the determination unit 610 uses a plurality of subframes corresponding to the physical random access channel. To send the increased message.
  • the determining unit 610 describes a transmittable message size corresponding to the number N of elements in the message root index function set below. It can be calculated as shown in Table 2.
  • the calculator 620 may set a message to be sent by the terminal 600 within a transmittable message size and calculate a preamble index and at least one message index from the message.
  • the calculator 620 may set a message to be transmitted to the base station within the calculated message size.
  • the operation unit 620 may generate a preamble index based on the first bit string in the message, and the first message index to the Nth message based on each bit string from the second bit string to the (N + 1) bit string in the message. Each message index up to the index can be determined.
  • the first bit string is in the message May correspond to a bit. More specifically, the calculation unit 620 may be used in a message.
  • the preamble index i may be determined by converting a binary value corresponding to a bit into a decimal number.
  • Each bit string from the second bit string to the (N + 1) bit string is a respective one in the first message to the Nth message. May correspond to a bit.
  • the calculating unit 620 may be configured to each of the first message to the Nth message.
  • First message index by converting the binary value corresponding to the bit to decimal Nth message index Can be determined.
  • the preamble index i is from 0. It may be any one of integers up to -1.
  • the preamble index i may be any one of an integer from 0 to N PA -1.
  • First message index From 0 Can be any one of integers up to one.
  • the operation unit 620 repeatedly extracts at least one message bit string corresponding to each of the at least one message index from the start bit of the set message, and extracts a preamble bit string from the remaining message. Can be.
  • the encoder 630 may provide to encode and transmit each of the preamble index and the at least one message index to the base station.
  • the message index set may be a first message index. Nth message index It may be to include.
  • the encoder 630 may generate a preamble sequence using a Zadoff Chu sequence. The general equation for the Zadoff weight sequence is shown in Equation 3 below.
  • Equation 3 the encoder 630 may generate a preamble sequence.
  • Equation 4 the equation for the generated preamble sequence is shown in Equation 4 below.
  • N CS represents a cyclic shifting magnitude determined based on a radius of a given cell.
  • the encoder 630 generates a preamble sequence by circularly moving the Zadoff weight sequence by a multiple of N CS .
  • the encoder 630 may generate a preamble sequence by substituting the preamble index i calculated by the calculator 620 according to Equation 4.
  • the operation unit 620 may calculate at least one message root index different from the preamble root index r by using each of at least one message root index function having the preamble index i as an independent variable.
  • the encoder 630 may generate a message sequence using the Zadoff weight sequence.
  • the encoder 630 may generate a first message sequence using a Zadoff weight sequence associated with the first message root index k 1 .
  • f 1 (i) is an arbitrary function that outputs the first message root index k 1 as the input of the preamble index i, and determines k 1 such that the preamble root index r and the first message root index k 1 have different values. do.
  • the preamble root index and the first message root index must have different values.
  • the encoder 630 may generate a first message sequence as shown in Equation 5 described below.
  • the encoder 630 is the first message index calculated by the calculator 620 in Equation 5 Can be substituted to generate a first message sequence. Compared with the preamble sequence described above, the first message sequence compares the preamble sequence with the first message index. The sequence is additionally moved by size. It will be apparent to those skilled in the art to extend the above-described method of generating the first message sequence to generate the Nth message sequence from the second message sequence.
  • the encoder 630 cyclically shifts the Zadoff weight sequence corresponding to the preamble root index by a constant value corresponding to the preamble index and the Zadoff weight sequence corresponding to each of the at least one message root index. May generate and transmit each message sequence cyclically shifted by the sum of a constant value corresponding to the preamble index and each of the at least one message index.
  • the entire transmission sequence transmitted to the base station by the terminal 600 according to the present invention may be as shown in Equation 6 below.
  • the terminal 600 may transmit a transmission sequence including both a preamble sequence and a message sequence. Is the signal strength associated with the preamble sequence, and Are signal strengths associated with the first message sequence and the Nth message sequence, respectively.
  • the terminal 600 may perform random access by selecting any one of a message simultaneous transmission mode for transmitting a preamble and a message together and a preamble transmission mode corresponding to a conventional random access method. Accordingly, the terminal 600 may further include a selection unit although not shown in FIG. 6. The selector may select one of a preamble transmission mode and a message simultaneous transmission mode. Accordingly, when the selector selects the preamble transmission mode, the encoder 630 may encode the preamble index and transmit the preamble index to the base station. In this case, the terminal 600 may perform random access by transmitting only the preamble to the base station as in the prior art.
  • FIG. 7 is an exemplary diagram illustrating a method of determining at least one message index and a preamble index according to an embodiment.
  • 010001000011000111011000 indicates a bit string that the terminal wants to transmit to the base station. In this case, the terminal starts from the beginning of the message.
  • the first bit string 710 corresponding to the bit may be extracted.
  • 010001000 may be extracted as the first bit string 710.
  • the decimal value 136 corresponding to the binary number 010001000 may be calculated.
  • the terminal associates 136 with the first message index associated with the first message. Can be determined.
  • the second bit string 720 corresponding to the bit may be extracted.
  • 011000111 may be extracted as the second bit string 720.
  • the decimal value 199 corresponding to the binary number 011000111 may be calculated.
  • the terminal associates 199 with the second message index. Can be determined.
  • the third bit string 730 corresponding to the bit may be extracted.
  • 011000 may be extracted as the third bit string 730.
  • the decimal value 24 corresponding to the binary number 011000 may be calculated.
  • the terminal may determine 24 as the preamble index i associated with the preamble.
  • the terminal may perform a step 811 of determining a transmittable message size in a start step of performing a random access procedure.
  • the terminal may determine the size of the transmittable message corresponding to the communication scheme with the base station.
  • Step 811 may be executed by a decision unit that is temporarily implemented by a processor included in the terminal.
  • the base station may broadcast random access information corresponding to a specified communication scheme to terminals within a predetermined range.
  • the terminal may determine the message size using the received random access information.
  • the random access information may include at least one of a size of a preamble cyclic shift, a number of preambles, a length of a preamble sequence, a preamble root index, and a message root index function set.
  • step 812 is a step of determining a preamble index and at least one message index based on the set message.
  • the terminal may determine a message corresponding to the message size determined in step 811.
  • the message may be a desired message that the terminal intends to transmit to the base station.
  • the terminal starts from the beginning of the message. Extract the first bit string corresponding to the bit, and start from the next bit of the message that follows. A second bit string corresponding to the bit may be extracted.
  • the terminal may extract the N-th bit string by repeating the bit string extraction. In addition, remaining in the message The (N + 1) th bit string corresponding to the bit may be extracted.
  • the terminal may determine each of the at least one message index by converting a binary number corresponding to each bit string from the first bit string to the Nth bit string into a decimal value.
  • the at least one message index is a first message index corresponding to a first bit string.
  • Nth message index corresponding to Nth bit string in It may include.
  • the terminal may determine the preamble index i by converting the binary number corresponding to the (N + 1) bit string to a decimal value.
  • Step 813 is the step of encoding the message and the preamble.
  • a preamble sequence and a message sequence may be generated at step 813.
  • the preamble sequence and the message sequence may be generated using the Zadoff weight sequence.
  • the description of the encoder 630 described with reference to FIG. 6 may be applied.
  • the terminal may complete the first step for the random access procedure by transmitting the preamble and the sequence encoded with the at least one message to the base station as shown in step 814. More specifically, the transmission may be performed using a physical random access channel.
  • step 8B there is shown a flowchart of a communication method in which a terminal performs a random access procedure to a base station according to another embodiment.
  • the communication method may include some additionally feasible steps when compared to the embodiment of FIG. 8A.
  • the terminal may optionally perform step 821.
  • step 821 the terminal may select any one of a preamble transmission mode corresponding to a conventional random access method and a message transmission mode for simultaneously transmitting a preamble and a message.
  • the description of the steps 811, 812, and 813 described above may be applied to the steps 822, 823, and 824 performed when the message transmission mode is selected.
  • step 821 when the preamble transmission mode is selected in step 821, a step 826 of determining the preamble index and an step 827 of encoding the preamble are performed. Compared with steps 823 and 834, there is a difference in that the step of determining the message index and the step of encoding the message are not performed.
  • the terminal 900 includes a processor and may be a terminal that performs a random access procedure with a base station. In addition, the terminal 900 may be a form temporarily implemented by the processor.
  • the terminal 900 may include a determiner 910 and a controller 920.
  • the determination unit 910 may determine whether a random access response message corresponding to the transmitted sequence is received.
  • the transmitted sequence may include a preamble and at least one message.
  • the transmitted sequence may be a sequence transmitted from the terminal 900 to the base station using the resources of the physical random access channel.
  • the determination unit 910 may determine whether to receive the random access response message by a first predetermined time interval from the time when the sequence is first transmitted. Accordingly, when the random access response message is not received even after the first time interval, the determination unit 910 may determine failure of receiving the random access response message.
  • the controller 920 may perform a back off corresponding to the second preset time interval.
  • the terminal 900 may perform a back off to delay the start of a new random access procedure. Therefore, the current terminal and the other terminal that is in the process of transmitting and receiving data using the random access procedure or the same may complete its own data transmission and reception in a more relaxed communication environment.
  • the controller 920 may transmit an additional message to the base station by using the uplink resource included in the random access response message.
  • the additional message may be a scheduling request message. More specifically, the determination unit 910 may find a random response message corresponding to the terminal 900 through the preamble identifier included in the random access response message, and check the information on the uplink resource. In addition, the determination unit 910 may confirm that the base station has successfully decoded a message included in the transmitted sequence together with the reception of the random access response message.
  • the base station 1000 is a block diagram illustrating a base station according to an embodiment.
  • the base station 1000 may include at least one processor.
  • the base station 1000 may be implemented at least temporarily by at least one processor.
  • the base station 1000 may include a calculator 1010, a detector 1020, and a decoder 1030.
  • the calculator 1010 may calculate a first correlation value to a (N + 1) correlation value based on the received sequence.
  • a signal associated with the sequence received by the base station 1000 may be represented by Equation 7 below.
  • h j represents a channel coefficient corresponding to the j th multipath
  • t j represents a delay shift corresponding to the j th multipath
  • K is a set of message root index functions whose elements are each of the message root index functions. Indicates.
  • W [n] represents a noise signal with 0 as an average and? 2 as a variance.
  • the calculator 1010 may calculate a correlation between the first Zadoff weight sequence associated with Y r, K [n] and the preamble root index r. More specifically, the calculator 1010 may calculate a first correlation value associated with the preamble index by using Equation 8 below.
  • the position number of the sequence having a peak value associated with the preamble may be calculated as N CS ⁇ i + t j .
  • the detector 1020 may determine the number of preamble detection regions in which the position number is included and calculate the preamble index i.
  • the preamble index i corresponds to the detection area. More than It can be detected within the following area.
  • the operator 1010 may calculate at least one message root index determined according to the preamble index i using the message index function set K.
  • the calculator 1010 may calculate a correlation value corresponding to each of the at least one message index by using the Zadoff weight sequence corresponding to the at least one message root index.
  • the operation unit 1010 may calculate a position number of a sequence having a peak value associated with the first message, and the second zadorf may be associated with Y r, K [n] and the first message root index k 1.
  • a second correlation value of the weight sequence can be calculated. More specifically, the calculator 1010 may obtain a second correlation value through Equation 9 below.
  • the position number of the sequence having a peak value associated with the first message is It can be calculated as
  • the detector 1020 may obtain a first message index by calculating a difference between a location number associated with the preamble and a location number associated with the first message. A description of the process of detecting each of the at least one message index will be described with the additional drawings below.
  • the decoder 1030 may decode the message transmitted by the terminal through the random access procedure by using the at least one message index and the preamble index detected by the detector 1020.
  • the message may include at least one of quality of service (QoS) information, scheduling request information, and user equipment identification information.
  • QoS quality of service
  • the decoder 1030 may decode only the preamble corresponding to the preamble index, as in the conventional random access scheme.
  • the decoder 1030 may identify a predetermined prefix bit in the decoded message, and determine an operation mode of the terminal according to the prefix bit. More specifically, the decoder 1030 transmits the subsequent message through a first mode for transmitting a subsequent message using a random access resource, a second mode for transmitting the message through a single frame and ending the transmission, and an additional frame. At least one of the third modes may be determined as the operation mode.
  • the decoded message may include resource block size information for transmitting the subsequent message.
  • the decoder 1030 may determine that the message is part of an entire message transmitted by the terminal, and merge subsequent messages decoded in the additional frame.
  • FIG. 11 is a graph illustrating a process of detecting a message index according to an embodiment.
  • the x axis represents the position number of the correlation value and the y axis represents the magnitude of the correlation value.
  • a terminal transmits a sequence of encoding a preamble and a first message to a base station through a random access procedure is described.
  • the terminal may transmit at least one message together with the preamble to the base station according to the message size corresponding to the communication scheme.
  • 1110 represents a peak value associated with a preamble.
  • the base station may calculate a correlation value of the first Zadoff weight sequence associated with Y r, K [n] and the preamble root index r using Equation 7.
  • the base station may calculate the position number 1130 of the peak value 1110 associated with the preamble using the calculated correlation value of the first Zadoff weight sequence.
  • the position number 1130 having the peak value 1110 associated with the preamble may be calculated as N CS ⁇ i + t j .
  • the base station may determine how many preamble detection regions the location number corresponding to 1110 is included in and calculate the preamble index i.
  • the preamble index i corresponds to the detection area as described in Equation 8 above. More than It can be detected within the following area.
  • the cross-correlation property of the Zadoff weight sequence will be used. Accordingly, there is a need for the base station to set and calculate a message root index that is different from the preamble root index.
  • the base station determines the location of the second Zadoff weight sequence associated with Y r, K [n] and the first message root index k 1 to detect a location number 1140 having a peak value 1120 associated with the first message.
  • the second correlation value may be calculated using Equation 9.
  • the position number 1140 having the peak value 1120 associated with the first message is It can be calculated as The base station calculates the difference between the location number 1130 and the location number 1140, thereby indexing the first message. 1150 can be obtained.
  • the first message index To obtain the equation can be obtained through equation (10).
  • Second message index silver end If greater than in It can be found by subtracting. On the other hand, end If greater than in It can be found by subtracting N ZC .
  • the base station determines the first message index from the received sequence. , Second message index And the preamble index i can be detected.
  • First message index Corresponds to 136
  • the binary value of the bit, the first bit string 1210 is 010001000.
  • corresponding to the preamble index i 24
  • the binary value of the bit, the third bit string 1230 becomes 011000.
  • the base station 1300 may include a processor and performs random access with the terminal.
  • the base station 1300 may be implemented at least temporarily by the processor.
  • the base station 1300 may include an operation unit 1310, a determination unit 1320, and a decoder 1330.
  • the calculating unit 1310 may calculate the received preamble index i using the sequence received from the terminal and the Zadoff weight sequence associated with the preamble. More specifically, the calculator 1310 may calculate the preamble index i by calculating a correlation value between the first Zadoff weight sequence associated with the preamble root index r and the received sequence. The calculation unit 1310 may determine whether the position number of the correlation value exists in the preamble detection region, and calculate the preamble index i.
  • the calculator 1310 may calculate a message root index k determined according to the preamble index i using the message index function.
  • the base station determines whether the preamble used by the plurality of terminals collides using the number of message indices detected. You can judge in the first step. More specifically, the determiner 1320 may determine whether the preamble collides by using the second Zadoff weight sequence associated with the message root index k determined by the preamble index i.
  • the base station may transmit information of the message root index k corresponding to the preamble index i to the terminal in advance as random access advance information.
  • the determiner 1320 may calculate a correlation value between the received sequence and the second Zadoff weight sequence associated with the message root index k.
  • the determination unit 1320 may determine a collision of a preamble between a plurality of terminals when two or more peaks of a correlation value exceeding a preset threshold are present. More specifically, the determination unit 1320 may determine a preamble collision when a location number at which a peak of a correlation value exceeding a threshold exists is detected in an area corresponding to at least two message indexes.
  • the base station 1300 may terminate the random access procedure by not transmitting the random access response message to the terminal.
  • the terminal may determine that a collision has occurred in the transmitted preamble by checking that the random access response message corresponding to the sequence transmitted by the terminal is not received.
  • the method of detecting the preamble index or the message index is determined by using the region where the position number where the peak of the correlation value is detected is present.
  • the area corresponding to each preamble index is not large enough, so that the base station determines whether a plurality of peaks due to multipaths of the same terminal are detected or whether the preambles of the plurality of terminals collide with each other. It was impossible.
  • the embodiment of the present invention by detecting the message index that may have a wider area than the area where the peak value associated with the preamble is detected, the number of terminals currently transmitting the same preamble more accurately is detected. You can expect the effect to work.
  • the operation unit 1310 may calculate the message index using the Zadoff weight sequence associated with the received sequence and the message root index.
  • the above description of the operation unit 1010 and the detection unit 1020 may be applied.
  • the decoder 1330 may decode a message transmitted by the terminal through a random access procedure by using the preamble index i and the message index l calculated by the calculator 1310. Similarly, the description of the decoder 1030 described above may be applied to the operation of the decoder 1330.
  • 14A and 14B are graphs illustrating a process of detecting a preamble collision according to an embodiment.
  • the X axis of the graph represents the position number of the correlation value and the Y axis represents the magnitude of the calculated correlation value.
  • the base station may calculate a first correlation value between the received sequence and the Zadoff weight sequence associated with the preamble root index r.
  • the base station may calculate the first correlation value using Equation 8 described above.
  • the base station may detect a location number having a correlation value greater than or equal to the preset threshold 1410 as a location number having a peak value.
  • the base station can detect the location number corresponding to three peaks 1421, 1422, 1423.
  • the base station may determine a region in which the location number exists at the three peaks 1421, 1422, and 1423.
  • the base station may determine that a location number corresponding to three peaks 1421, 1422, and 1423 exists in the fourth region 1434 corresponding to the fourth preamble index 3.
  • the base station will not be able to determine whether the preamble collides with the fact that the three peaks 1421, 1422, and 1423 are detected in the region corresponding to the same preamble index. This is because a plurality of peaks may be generated by a sequence transmitted by one terminal, such as when the same terminal experiences multiple passes. Accordingly, the base station may calculate the corresponding message root index by substituting the detected preamble index 3 into the message root index function.
  • the base station may calculate the second correlation value using the received sequence using the calculated message route index 5 and the Zadoff weight sequence associated with the message route index 5.
  • FIG. The base station may calculate the second correlation value using Equation 9 described above.
  • the base station may determine the number of peaks of the second correlation value in the region corresponding to the entire Zadoff weight sequence.
  • the base station may detect a location number having a correlation value greater than or equal to the preset threshold 1410 as a location number having a peak value.
  • the base station may detect three peaks 1441, 1442, and 1443 as peaks corresponding to the message index. Accordingly, the base station may detect that the current preamble index 3 has been collided by three terminals.
  • the base station may terminate the random access procedure without transmitting the random access response message to the three terminals.
  • Step 1501 is a step in which a base station receives a sequence from a terminal.
  • the base station may receive a sequence from a plurality of terminals at the same time.
  • Step 1502 is a step of calculating a correlation value corresponding to the preamble using the received sequence and the Zadoff weight sequence corresponding to the preamble.
  • step 1502 may be performed by the calculator 1310 of the base station 1300.
  • step 1502 may be performed using Equation 8.
  • the base station may calculate a correlation value corresponding to one preamble.
  • Step 1503 is detecting the preamble index.
  • the base station detects the peak position of the correlation value corresponding to the preamble and detects the position number corresponding to the peak position. Referring to Equation 8, the position number may be calculated as N CS ⁇ i + t j .
  • the base station may determine which preamble detection region includes a location number corresponding to a peak of a correlation value corresponding to the preamble, and calculate a preamble index i.
  • the preamble index i corresponds to the detection area as described in Equation 8 above. More than It can be detected within the following area.
  • the base station may detect the preamble index i.
  • Step 1504 is a step in which the message route index k is calculated by the base station. More specifically, in step 1504, the base station may calculate the message root index k corresponding to the detected preamble index i using the message root index function. As an example, step 1504 may be performed by the calculator 1310 of the base station 1300.
  • the base station when the base station randomly accesses at least one terminal simultaneously, the base station may set a plurality of message route index function sets.
  • the base station Prior to performing the random access procedure, the base station may match a specific message route index function set to a specific terminal and transmit the specific message route index function set to the specific terminal.
  • the base station may calculate a specific message route index set corresponding to the specific terminal.
  • Step 1505 is a step of computing a correlation value using the Zadoff weight sequence corresponding to the received sequence and the message root index k. Step 1505 may be performed using Equation 9 described above.
  • the Zadoff weight sequence corresponding to each message root index of the specific message root index set may be calculated. For example, when the number of elements of the message root index set is N, in step 1505, the base station determines from the Zadoff weight sequence corresponding to the first message root index to the Zadoff weight sequence corresponding to the Nth message root index. Up to can be calculated. In addition, a correlation value corresponding to each of the Zadoff weight sequences may be calculated.
  • the base station may compare the peak of the correlation value corresponding to the message root index k with a predetermined threshold and determine whether the number of peaks of the correlation value exceeding the threshold is at least two or more.
  • the base station may recognize the preamble collision between the plurality of terminals in step 1507 and terminate the random access procedure. have.
  • the base station may determine that no preamble collision has occurred. Accordingly, the base station may proceed to decoding the preamble and the at least one message 1508 and transmitting the random access response message 1509.
  • the method 1600 for communicating with a base station includes steps 1610 corresponding to each of the preamble indexes in the plurality of sequences received, calculating 1620 a connection load corresponding to the number of the detected at least one message index, and a preset value. Comparing a threshold value with the access load, and controlling the access period of the physical random access channel 1630 according to the comparison result.
  • the base station may calculate a corresponding message root index by using each preamble index used in the random access procedure.
  • the base station may detect the number of message indexes received from the plurality of terminals using the Zadoff weight sequence corresponding to each of the message route indexes.
  • the base station may calculate the number of message indexes corresponding to one preamble index and store the calculated result. In addition, the base station may calculate the number of message indexes detected on average in the current random access procedure. Using the number of the message index, the base station may determine the access load corresponding to the current random access procedure.
  • step 1630 the base station compares a predetermined threshold with the access load and controls the access period of the physical random access channel according to the comparison result.
  • Step 1630 sets the T RACH corresponding to the connection period when the connection load is smaller than the threshold, and sets the T RACH corresponding to the connection period when the connection load is larger than the threshold. It may comprise the step of setting.
  • the base station can broadcast the corresponding content as random access advance information to each terminal.
  • 17 is a flowchart illustrating a random access procedure of a terminal and a base station according to an embodiment.
  • the UE may transmit not only a preamble but also a message together with a physical random access channel (PRACH) to be transmitted to the base station. More specifically, the terminal may transmit a transmission sequence including a preamble and a message to the base station. The terminal may select and use any preamble corresponding to a predetermined communication scheme with the base station. More specifically, given the length N ZC of the Zadoff Chu sequence and the cyclic shifting size Ncs of the preamble cyclic shifting size Ncs, the number of preamble sequences N PA that the terminal can transmit to the base station is represented by Equation 1 above. It can be determined according to.
  • Equation 1 the number of preamble sequences N PA that the terminal can transmit to the base station is represented by Equation 1 above. It can be determined according to.
  • any natural number K in the total available N PA preambles may be predefined for use by a fixed terminal.
  • any natural number L in the total available N PA preambles may be pre-designated for use by a mobile terminal.
  • the fixed terminal among the terminals may encode a preamble generated using the preamble root index r fix and transmit the encoded preamble to the base station.
  • the mobile terminal among the terminals may encode the preamble generated using the preamble root index r mob and transmit the encoded preamble to the base station.
  • the terminal sets a message root index function set for transmitting a message through a physical random access channel.
  • the terminal may set a message root index set defined by the preamble index i.
  • the preamble root index r and the element k of the message root index set may be set to have different values to use cross-correlation of the Zadoff weight sequence.
  • the number of message bits that can be transmitted using a physical random access channel (PRACH) may be determined as shown in Equation 2 above.
  • the natural number N may represent the number of elements of the message root index function set.
  • the terminal determines to transmit the increased message using a plurality of subframes corresponding to the random access channel.
  • the time axis length of the PRACH can be configured using a plurality of subframes.
  • N 1
  • the bit may indicate the preamble index i.
  • the terminal when the fixed terminal and the mobile terminal are identified using the preamble index i, in step 1710, the terminal indexes the message in the transmission sequence. Corresponding to The bits can be used to send a message.
  • the terminal uses the preamble index i and the message index in the transmission sequence.
  • the terminal uses the preamble index i and the message index in the transmission sequence.
  • the bits can be used to send a message.
  • the base station may detect the preamble index using the received sequence. In addition, the base station may further detect the message index using the received sequence.
  • the base station may identify whether the terminal associated with the preamble is a fixed terminal or a mobile terminal using the decoded preamble index.
  • the base station may determine whether the preamble is collided using the number of the detected message indexes. In more detail, when the number of detected message indexes is plural, the base station may determine that the plurality of terminals use the same preamble and detect collision of the preamble.
  • the base station may generate a random access response message and transmit the generated random access response message to the terminal. More specifically, the random access response message may include at least one of the detected preamble index, time alignment information (TA), and uplink resource grant.
  • TA time alignment information
  • the terminal may transmit data using a physical uplink shared channel (PUSCH) allocated from the base station.
  • PUSCH physical uplink shared channel
  • the base station may receive data including a desired message and a terminal identifier from the terminal.
  • the base station may transmit an ACK for the data to the terminal.
  • the transmission may be performed through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the base station may transmit a contention resolution message to the terminal.
  • the base station may transmit a random access response message to the terminal. More specifically, the base station may pair the fixed terminals and allocate the same uplink resource when the fixed terminals that know their time alignment information collide with each other. More specifically, the fixed terminals may represent two different fixed terminals. In such a case, even in the case of a preamble collision, data transmission can be attempted by sharing uplink resources, so that an effect of using communication resources can be expected more efficiently. A more detailed description of the operation of the base station will be described in more detail with the drawings added below.
  • FIG. 18 is a flowchart illustrating a random access procedure of a base station according to an embodiment.
  • the base station may receive a transmission sequence including a preamble and a message from the terminal.
  • the description of step 1710 of FIG. 17 may be applied as it is.
  • the base station may identify whether the terminal transmitting the transmission sequence is a fixed terminal or a mobile terminal.
  • the base station may calculate a first correlation value between the received transmission sequence and the Zadoff weight sequence associated with the preamble root index r.
  • the base station may detect a location number having a correlation value greater than or equal to a preset threshold as the location number corresponding to the peak value.
  • the base station may identify whether the terminal transmitting the transmission sequence is a fixed terminal or a mobile terminal according to the area where the location number exists. For example, when the value of the preamble index is detected to be 1 or more and the natural number K or less, the base station may identify the terminal as a fixed terminal.
  • the base station may identify the terminal as a mobile terminal.
  • the base station may identify the terminal as a mobile terminal.
  • the base station may calculate a second correlation value between the received transmission sequence and the Zadoff weight sequence corresponding to any one of the first preamble root index r fix and the second preamble root index r mob .
  • the base station may calculate a preamble root index such that a peak value having a correlation value above a predetermined threshold is detected. According to the result of the calculation, the base station can identify whether the terminal transmitting the transmission sequence is a fixed terminal or a mobile terminal.
  • the base station may identify the terminal as a fixed terminal.
  • the base station may identify the terminal as a mobile terminal.
  • the base station may perform step 1830.
  • the base station may determine whether the preamble index transmitted by the terminal is a double access preamble.
  • a double access preamble may indicate a case in which two different terminals transmit a same preamble index to a base station and a collision occurs.
  • the base station may calculate the number of received preamble indexes using the message root index k.
  • the preamble root index r and the message root index k may be set to different values so as to take advantage of cross-correlation of Zadoff weight sequences.
  • the base station may calculate a third correlation value using the Zadoff weight sequence associated with the transmission sequence and the message root index k. The base station may determine the number of peaks of the third correlation value in the region corresponding to the entire Zadoff weight sequence.
  • the area corresponding to the message root index k may include more location numbers than the area corresponding to the preamble root index r, thereby calculating the distribution of peak values in a wider area.
  • the base station can determine the number of collisions in which the same preamble was received. For example, when the peak is two, the base station may determine that the received preamble is a double access preamble. In addition, when there is one peak, the base station may determine that the received preamble is a single access preamble.
  • the base station may perform step 1840.
  • the base station may generate a first random access response message and transmit the first random access response message generated to the terminal.
  • the base station may pair two fixed terminals that have transmitted the same preamble index, and transmit a first random access response message to each of the two fixed terminals.
  • the first random access response message may include the detected preamble index and location information of the uplink resource.
  • the first random access response message may include time alignment information corresponding to a smaller value of time alignment information of the received two double access preambles.
  • the base station may encode time alignment information associated with the fixed terminal close to the base station to the first random access response message and transmit the first random access response message generated to the two fixed terminals.
  • Terminals having a fixed location may also have a fixed distance to the base station. Accordingly, each fixed terminal can know its time alignment information in advance, and whether there is a collision in the preamble transmitted by using the received first random access response message, and the preamble transmitted by the preamble is a double access preamble. It can be determined whether or not. According to the present embodiment, even if two different fixed terminals transmit the same preamble and a collision of the preamble occurs, the random access procedure may be continuously performed.
  • the base station may perform step 1850.
  • the base station may perform step 1850.
  • the base station may determine whether the preamble index transmitted by the terminal is a single access preamble. The description of step 1830 may be applied to step 1850 as it is. The base station may detect whether the number of received preamble indexes is one using the message root index k. The detailed description will be omitted overlapping with the above description.
  • the base station may perform a back off and newly proceed with the next random access procedure. In other words, when at least three identical preambles are received from the fixed terminal, the base station may perform a back off and newly execute the next random access procedure. In addition, when at least two identical preambles are received from the mobile terminal, the base station may perform a back off and newly perform the next random access procedure.
  • the base station may perform step 1860.
  • the base station may group respective terminals that have transmitted different single access preambles.
  • the base station may allocate the same uplink resource to each of the grouped terminals. For example, in step 1870, the base station generates a second random access response message including an index of the single access preamble transmitted by the first terminal, time alignment information of the first terminal, and location information of the shared uplink resource. And transmit to the terminal. More specifically, when different M terminals are grouped, the base station may generate different M random access response messages corresponding to each terminal. Each terminal may receive a second random access response message corresponding to it. However, the uplink resource included in the second random access response message may be shared and reused with other terminals grouped together.
  • the base station may perform step 1880 to perform an additional random access procedure.
  • the base station may receive a message from the terminal through the uplink resources.
  • the base station may decode the received message using a successive interference cancellation (SIC) scheme.
  • SIC successive interference cancellation
  • Sequential interference cancellation refers to a technique for processing a signal using a difference in signal strength of received signals.
  • the base station can decode each of the plurality of messages transmitted through one uplink resource in a manner that decodes the strong signal, first extracts the strong signal from the superimposed signal, and removes the weak signal from the remaining signals. . Since sequential interference cancellation is straight forward to the experts in the technical field, detailed descriptions are omitted.
  • 19 is a flowchart illustrating a random access procedure of a terminal according to an embodiment.
  • the terminal may transmit the preamble to the base station according to a predetermined communication scheme.
  • the terminal may transmit a preamble index within a predetermined range among the number N PAs of transmittable preamble sequences to the base station.
  • the terminal may transmit the preamble generated using the preamble root index r fix that is specified in advance to the base station.
  • the terminal may determine whether a random access response message including the preamble index transmitted by the terminal is received. If it is determined in step 1920 that the random access response message including the preamble index transmitted by the terminal is not received, the terminal may perform a back off and start a new random access procedure.
  • the terminal may perform step 1930.
  • the terminal may determine whether its time alignment information is included in the received random access response message.
  • the terminal may represent a node communicating with the base station at a fixed location.
  • the physical distance between the terminal and the base station may represent a fixed value so that the terminal may know in advance its own time alignment information existing within a preset range. Accordingly, the terminal checks the time alignment information from the received random access response message to determine whether a collision occurs in the preamble transmitted by the terminal and whether the uplink resource is shared with other terminals. have.
  • the terminal may perform step 1940.
  • the terminal may determine whether there is another random access response message including the uplink resource allocated to the terminal.
  • the terminal may perform step 1950.
  • the terminal may compare time alignment information included in another random access response message with time alignment information associated with the terminal.
  • the terminal may adjust the transmission power of the data to vary by a predetermined amount from a predetermined reference power based on the result of the comparison.
  • the terminal may perform step 1960. More specifically, the time alignment information included in the received random access response message may indicate time alignment information of another terminal having a shorter distance than the base station and the terminal. The terminal may check that time alignment information other than the time alignment information associated with the terminal is included in the random access response message, and may determine that the currently transmitted preamble is the double access preamble. Accordingly, the terminal may adjust the transmission power of the data to vary by a predetermined amount than the predetermined reference power. As described above, a more detailed description of the configuration in which the terminal adjusts the transmission power of the data will be described with reference to the accompanying drawings.
  • the terminal In operation 1970, the message may be transmitted to the base station by using the location information of the uplink resource included in the access response message. In the present embodiment, even when two different terminals transmit the same preamble, each terminal may transmit a message with the base station according to a method of adjusting the respective transmission powers to efficiently use communication resources. have.
  • 20 is a block diagram illustrating a terminal according to an embodiment.
  • the terminal 2000 may include a determiner 2010 and a controller 2020.
  • the terminal 2000 may include at least one processor, and may be implemented at least temporarily by the at least one processor.
  • the determination unit 2010 may determine whether the preamble index previously transmitted by the terminal 2000 is included in the received random access response message.
  • the determination unit 2010 may determine whether the received random access response message includes time alignment information related to the terminal 2000.
  • the description of the operation of the determination unit 2010, the description of the above-described steps 1920 and 1930 may be applied as it is and thus the detailed description thereof will be omitted.
  • the controller 2020 may adjust the transmission power of data transmitted through the uplink resource according to the determination result of the determination unit 2010.
  • the uplink resource may indicate an uplink resource included in the received random access response message.
  • the controller 2020 when it is determined that the received random access response message includes the preamble transmitted by the terminal 2000 and the time alignment information related to the terminal 2000, the controller 2020 supplies a predetermined reference power. Data may be transmitted to the base station.
  • the predetermined reference power may indicate a power value corresponding to the LTE standard.
  • the controller 2020 may advance Data may be transmitted using a power that is changed by a predetermined amount rather than a designated reference power.
  • SNR Signal to Noise Ratio
  • E [H A ] may represent an expected channel gain of the terminal 2000
  • P ref, A may represent a predetermined reference power of the terminal 2000
  • r A represents the distance between the base station and the terminal 2000
  • N 0 denotes a noise power.
  • the controller 2020 may adjust the power of the terminal 2000 to transmit data as in P A of Equation 12 below.
  • the controller 2020 may increase the transmission power of the data transmitted by the terminal 2000 by x dB than the reference power P ref, A.
  • x dB may be set to 3 dB.
  • the base station may first decode a message received from the terminal 2000 according to the sequential interference cancellation method, and may also transmit a message at a reference power to decode a message of another terminal having a lower transmission power than the terminal 2000. have.
  • the transmission power of the data transmitted by the terminal 2000 is increased by x dB than the reference power P ref, A is illustrated , but this will not limit or limit the scope of other embodiments.
  • the sequential interference cancellation scheme an embodiment in which the transmission power of the data transmitted by the terminal 2000 is reduced by x dB than the reference power P ref, A may be implemented.
  • the received random access response message includes the preamble transmitted by the terminal 2000 and time alignment information associated with the terminal 2000, but includes the same uplink resource allocated to the terminal 2000.
  • the determination unit 2010 may compare time alignment information associated with the terminal with each time alignment information included in the other random access response message.
  • the controller 2020 may calculate the number of time alignment information having a larger value than the time alignment information associated with the terminal 2000.
  • the terminal 2000 transmits a single access preamble without collision to the base station. For example, assume that there is a first terminal and a second terminal allocated with the same uplink resource as the terminal 2000. If both the first time alignment information associated with the first terminal and the second time alignment information associated with the second terminal are larger than the time alignment information of the terminal 2000, the terminal 2000 may generate data as shown in Equation 13 below. You can adjust the power P A to transmit.
  • the terminal 2000 may determine that the distance between itself and the base station is closer than that of other terminals. Accordingly, the terminal 2000 may adjust its transmission power such that its own data close to the base station is first decoded by increasing its transmission power.
  • the power is increased by 2x dB than the reference power is shown, which does not limit or limit the range of other embodiments, and an embodiment in which the power is reduced by 2x dB may also be implemented.
  • 21 is a flowchart illustrating a random access procedure of a terminal according to another embodiment.
  • the terminal may transmit the preamble to the base station according to a predetermined communication scheme.
  • the terminal may transmit a preamble having a predetermined range among the number N PAs of transmittable preamble sequences to the base station.
  • the terminal may transmit the preamble generated using the preamble root index r mob that is specified in advance to the base station.
  • the terminal may determine whether a random access response message including the preamble index transmitted by the terminal is received.
  • the description of step 2120 the description of step 1920 described above may be applied as it is, and thus a detailed description thereof will be omitted.
  • the terminal may perform step 2130.
  • the terminal may determine whether there is another random access response message including the same uplink resource as the uplink resource allocated thereto.
  • the terminal may perform step 2140.
  • the terminal may compare time alignment information included in another random access response message with time alignment information associated with the terminal.
  • the terminal may adjust the transmission power of the data to vary by a predetermined amount from a predetermined reference power based on the result of the comparison.
  • the description of the process of adjusting the transmission power of the data by the terminal may be applied to the description of the controller 2020, and thus the detailed description thereof will be omitted.
  • step 2140 If step 2140 is performed or if it is determined in step 2130 that there is no other random access response message that includes the uplink resource allocated to the terminal, the terminal includes the uplink resource included in the random access response message. Using step 2150, a message may be transmitted to the base station.
  • 22 is a block diagram illustrating a base station according to an embodiment.
  • the base station 2200 may include an identification unit 2210, a determination unit 2220, and a generation unit 2230.
  • the identification unit 2210 may identify whether the terminal associated with the preamble is a fixed terminal or a mobile terminal by using the received preamble.
  • the identification unit 2210 may identify whether the terminal is a fixed terminal or a mobile terminal according to the index size of the decoded preamble.
  • the identification unit 2210 may identify whether the terminal is a fixed terminal or a mobile terminal according to the root index used for decoding the preamble.
  • the determination unit 2220 may determine the number of times the preamble having the same value as the index associated with the preamble is received. More specifically, the determiner 2220 may determine the number of times the preamble having the same value is received using the message root index and the Zadoff weight sequence defined according to the preamble index. More specifically, the determiner 2220 calculates a correlation value between the received sequence and the Zadoff weight sequence associated with the message root index, and has the same value according to the number of peaks exceeding a threshold in the graph of the correlation value. The number of times the preamble is received may be determined.
  • the generation unit 2230 may generate a random access response message according to the identification result of the identification unit 2210 and the determination result of the determination unit 2220.
  • the generation unit 2230 may generate the index, location information of the uplink resource, and the The random access response message including time alignment information indicating a smaller value among time alignment information of two preambles may be generated.
  • the generation unit 2230 when it is determined that the terminal is identified as a fixed terminal and at least three or more preambles having the same value as the index have been received, the generation unit 2230 does not generate a random access response message. You can perform a back off and start a new random access procedure.
  • the generation unit 2230 when it is determined that the terminal is identified as a mobile terminal and a plurality of preambles having the same value as the index are received, the generation unit 2230 does not generate a random access response message and backs off. And start a new random access procedure.
  • the generator 2230 transmits a first terminal that transmits the first preamble and a second preamble that transmits the second preamble.
  • 2 terminals can be grouped. More specifically, the first preamble is received one preamble having the same value as the first index associated with the first preamble, and the second preamble also has a preamble having the same value as the second index associated with the second preamble It may indicate that one has been received.
  • the generation unit 2230 may generate a random access response message for allocating the same uplink resource to the first terminal associated with the first preamble and the second terminal associated with the second preamble.
  • Each random access response message generated may be transmitted to the first terminal and the second terminal, respectively.
  • the first random access response message transmitted to the first terminal may include a preamble index transmitted by the first terminal, time alignment information associated with the first terminal, and location information of the same uplink resource shared. .
  • the embodiments described above may be implemented as hardware components, software components, and / or combinations of hardware components and software components.
  • the devices, methods, and components described in the embodiments may include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable gates (FPGAs). It may be implemented using one or more general purpose or special purpose computers, such as an array, a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions.
  • the processing device may execute an operating system (OS) and one or more software applications running on the operating system.
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • OS operating system
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include.
  • the processing device may include a plurality of processors or one processor and one controller.
  • other processing configurations are possible, such as parallel processors.
  • the software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device.
  • Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted.
  • the software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner.
  • Software and data may be stored on one or more computer readable recording media.
  • the method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like.
  • Program instructions recorded on the computer readable medium may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Landscapes

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

Abstract

L'invention concerne un équipement d'utilisateur (UE) qui comprend un processeur et qui exécute un procédure d'accès aléatoire avec une station de base (nœud B E-UTRAN (eNodeB), également appelé nœud B évolué). L'UE peut être constitué au moins temporairement par le processeur. L'UE peut comporter: une unité de détermination servant à déterminer une taille de messages qui peut être émise et qui correspond à un canal physique d'accès aléatoire d'après un procédé de communication affecté avec la station de base; une unité de calcul servant à configurer un message de manière à correspondre à la taille de messages et à calculer respectivement un index de préambule et au moins un index de message à partir du message; et un codeur servant à assurer un codage respectif de l'index de préambule et de l'index ou des index de message, et à les envoyer à la station de base.
PCT/KR2016/001728 2015-04-10 2016-02-23 Appareil et procédé de communication utilisant une procédure d'accès aléatoire Ceased WO2016163642A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/502,857 US10231196B2 (en) 2015-04-10 2016-02-23 Communication apparatus and method using random access procedure

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20150050842 2015-04-10
KR10-2015-0050842 2015-04-10
KR10-2015-0130823 2015-09-16
KR1020150130823A KR101678792B1 (ko) 2015-04-10 2015-09-16 임의접속 과정을 통한 통신 장치 및 방법
KR10-2016-0020391 2016-02-22
KR1020160020391A KR101776460B1 (ko) 2016-02-22 2016-02-22 임의접속 자원을 재사용하는 통신 장치 및 방법

Publications (1)

Publication Number Publication Date
WO2016163642A1 true WO2016163642A1 (fr) 2016-10-13

Family

ID=57073261

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2016/001728 Ceased WO2016163642A1 (fr) 2015-04-10 2016-02-23 Appareil et procédé de communication utilisant une procédure d'accès aléatoire

Country Status (1)

Country Link
WO (1) WO2016163642A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018086535A1 (fr) * 2016-11-14 2018-05-17 维沃移动通信有限公司 Procédé d'envoi de données de liaison montante, terminal et dispositif de réseau
CN114079552A (zh) * 2020-08-18 2022-02-22 中国移动通信有限公司研究院 一种随机接入前导序列的生成方法、装置、终端及设备
WO2025002459A1 (fr) * 2023-06-30 2025-01-02 深圳市汇川技术股份有限公司 Procédé et appareil d'accès aléatoire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100704068B1 (ko) * 1998-10-14 2007-04-05 루센트 테크놀러지스 인크 액세스 우선 순위 제어 방법 및 장치
KR20080013649A (ko) * 2006-08-09 2008-02-13 삼성전자주식회사 이동통신 시스템에서 랜덤액세스 프로시져를 이용한 정보의 송수신방법 및 장치
KR20100032266A (ko) * 2008-09-17 2010-03-25 삼성전자주식회사 이동통신 시스템에서 랜덤액세스 절차시 상위 메시지가 적응적 재전송 명령에 의해 인터럽트 되는 경우에 대한 처리 방법 및 장치
KR101033689B1 (ko) * 2007-03-15 2011-05-12 한국전자통신연구원 이동 통신 시스템에서의 프리앰블 할당 방법 및 임의 접속방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100704068B1 (ko) * 1998-10-14 2007-04-05 루센트 테크놀러지스 인크 액세스 우선 순위 제어 방법 및 장치
KR20080013649A (ko) * 2006-08-09 2008-02-13 삼성전자주식회사 이동통신 시스템에서 랜덤액세스 프로시져를 이용한 정보의 송수신방법 및 장치
KR101033689B1 (ko) * 2007-03-15 2011-05-12 한국전자통신연구원 이동 통신 시스템에서의 프리앰블 할당 방법 및 임의 접속방법
KR20100032266A (ko) * 2008-09-17 2010-03-25 삼성전자주식회사 이동통신 시스템에서 랜덤액세스 절차시 상위 메시지가 적응적 재전송 명령에 의해 인터럽트 되는 경우에 대한 처리 방법 및 장치

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JANG, HAN SEUNG.: "Spatial Group based Random Access for M2M Communications''.", MASTER'S THESIS, KAIST, ELECTRICITY AND ELECTRONIC ENGINEERING, 20 December 2013 (2013-12-20), pages 1 - 58, XP011550752 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018086535A1 (fr) * 2016-11-14 2018-05-17 维沃移动通信有限公司 Procédé d'envoi de données de liaison montante, terminal et dispositif de réseau
US10912123B2 (en) 2016-11-14 2021-02-02 Vivo Mobile Communication Co., Ltd. Method for transmitting uplink data, user equipment and network-side device
CN114079552A (zh) * 2020-08-18 2022-02-22 中国移动通信有限公司研究院 一种随机接入前导序列的生成方法、装置、终端及设备
WO2025002459A1 (fr) * 2023-06-30 2025-01-02 深圳市汇川技术股份有限公司 Procédé et appareil d'accès aléatoire

Similar Documents

Publication Publication Date Title
WO2020091518A1 (fr) Procédé d'accès aléatoire, équipement terminal et support d'informations informatique en référence croisée à une application associée
WO2018203719A1 (fr) Procédés de transmission de signal de liaison montante et de signal de liaison descendante, ue et station de base
WO2016122231A1 (fr) Procédé, équipement utilisateur et station de base pour émettre des signaux de liaison montante
WO2017209570A1 (fr) Procédé de transmission de données en liaison montante, procédé d'accès aléatoire, et ue et station de base correspondants
WO2019216586A1 (fr) Procédé de transmission de liaison montante sans autorisation, équipement utilisateur, et dispositif station de base
WO2010024616A2 (fr) Appareil et procédé de transmission et de réception d'informations de rétroaction rapide dans un système de communication sans fil large bande
EP3777409A1 (fr) Procédé de transmission de liaison montante sans autorisation, équipement utilisateur, et dispositif station de base
WO2011005048A2 (fr) Station mobile, station de base et procédé de fonctionnement de la station mobile
WO2014081197A1 (fr) Procédé pour une programmation de paquet sur la liaison montante, et dispositif correspondant.
WO2015111851A1 (fr) Procédé de mise en œuvre de synchronisation entre des dispositifs d2d et un dispositif d2d
WO2017171519A1 (fr) Procédé et appareil d'émission d'un canal de commande et d'un canal de données dans une communication v2x
WO2020139056A1 (fr) Procédé d'accès aléatoire, équipement utilisateur et station de base
WO2019031900A1 (fr) Procédé et terminal de communication v2x
WO2012153960A2 (fr) Procédés et appareils pour procédures d'accès aléatoire avec agrégation de porteuses pour systèmes lte avancés
WO2017065554A1 (fr) Appareil et procédé pour réaliser une opération de formation de faisceau dans un système de communication à ondes millimétriques
EP3571889A1 (fr) Procédé et appareil pour l'accès initial d'un terminal dans un système de communication sans fil
EP3549383A1 (fr) Procédé d'accès aléatoire, équipement d'utilisateur et station de base
WO2016195346A1 (fr) Procédé et dispositif de traitement d'accès aléatoire
WO2023063721A1 (fr) Procédé et dispositif pour concevoir un signal de commande de ris dans un système de communication sans fil
WO2015016627A1 (fr) Procédé et dispositif permettant de connecter un seul dispositif ap parmi de multiples dispositifs ap dans le même réseau sur un terminal
WO2021230464A1 (fr) Procédé et appareil d'attribution asynchrone de ressources dans un système informatique périphérique mobile
WO2017142358A1 (fr) Procédé et dispositif permettant d'effectuer la communication dans un système de communication sans fil
WO2017124771A1 (fr) Procédé d'envoi de srs, dispositif d'envoi de srs et terminal
WO2011105809A2 (fr) Procédé et dispositif d'allocation de ressources groupées dans un système d'accès sans fil
WO2015009004A1 (fr) Procédé de communication dans un système de communication sans fil reposant sur une agrégation de porteuses

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16776745

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16776745

Country of ref document: EP

Kind code of ref document: A1