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WO2014000165A1 - Procédé de transmission d'informations, nœud de réseau, équipement utilisateur et système - Google Patents

Procédé de transmission d'informations, nœud de réseau, équipement utilisateur et système Download PDF

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Publication number
WO2014000165A1
WO2014000165A1 PCT/CN2012/077570 CN2012077570W WO2014000165A1 WO 2014000165 A1 WO2014000165 A1 WO 2014000165A1 CN 2012077570 W CN2012077570 W CN 2012077570W WO 2014000165 A1 WO2014000165 A1 WO 2014000165A1
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WO
WIPO (PCT)
Prior art keywords
search space
prach
message
network node
configuration information
Prior art date
Application number
PCT/CN2012/077570
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English (en)
Chinese (zh)
Inventor
官磊
薛丽霞
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201280001151.8A priority Critical patent/CN103688588B/zh
Priority to PCT/CN2012/077570 priority patent/WO2014000165A1/fr
Publication of WO2014000165A1 publication Critical patent/WO2014000165A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an information transmission method, a network node, a user equipment, and a system.
  • a control area is used to transmit control information of a User Equipment (UE), which includes a common search space and a UE-specific search space.
  • UE User Equipment
  • the UE-specific search space carries a Physical Downlink Control Channel (PDCCH) of a specific UE
  • PDCCH Physical Downlink Control Channel
  • the common search space is used to carry a PDCCH common to multiple UEs.
  • a PDCCH that schedules system messages and paging messages, a PDCCH that schedules random access response messages, and the like may be carried in the common search space.
  • the process of random access of the UE in the prior art is as follows:
  • the UE sends a preamble sequence of a physical random access channel (PRACH) to the network node, and after receiving the preamble sequence, the network node passes the PDCCH in the common search space.
  • a random access response message is scheduled to be sent to the UE in the common search space.
  • the UE detects the PDCCH for scheduling the random access response message in the common search space and obtains a random access response message, where the random access response message carries a temporary scrambling code and other timing configuration information.
  • the UE sends an uplink data packet to the network node, where the uplink data packet carries the UE identification information and the obtained temporary scrambling code. In this way, when the network node receives the uplink data packet and parses the temporary scrambling code and the UE identification information, the random access of the UE is completed.
  • PRACH physical random access channel
  • an enhanced physical downlink control channel (E-PDCCH) is introduced in a later advanced LTE version such as LTE-Advanced (LTE-A). Therefore, the PDCCH will be replaced by the e-PDCCH search space in some carriers. In the search space, there are some carriers that have both the e-PDCCH search space and the PDCCH search space.
  • some UEs can support e-PDCCH and PDCCH, and some UEs only support PDCCH.
  • the inventors have found that at least the following problems exist in the prior art: In order to be compatible with UEs of different capabilities, after receiving the PRACH message sent by the UE, the network node cannot select the search space according to the capability requirement of the UE, but only in the e-PDCCH. Both the search space and the PDCCH search space send an e-PDCCH or a PDCCH for scheduling a random access response message, which causes waste of resources in the common search space, resulting in a low random access capacity.
  • Embodiments of the present invention provide an information transmission method, a network node, a user equipment, and a system, which can save common search space resources and increase random access capacity.
  • An information transmission method includes:
  • the target search space is one of at least two search spaces provided by the network node, and each search space corresponds to a set of PRACH configuration information
  • An information transmission method includes:
  • the user equipment UE receives at least one set of physical random access channel PRACH configuration information delivered by the network node, where a set of PRACH configuration information corresponds to one search space;
  • a network node including:
  • a receiving unit configured to receive a physical random access channel PRACH message sent by the user equipment UE, where the determining unit is configured to determine a target search space according to the PRACH configuration information carried by the PRACH message received by the receiving unit, where the target search The space is one of at least two search spaces provided by the network node, each search space corresponding to a set of PRACH configuration information, and a sending unit, configured to send, by using the target search space determined by the determining unit, the scheduled random access to the UE The downlink control message of the response message.
  • a user equipment UE including:
  • a first receiving unit configured to receive at least one set of physical random access channel PRACH configuration information delivered by the network node, where a set of PRACH configuration information corresponds to one search space;
  • a sending unit configured to send a PRACH message to the network node according to the PRACH configuration information corresponding to the target search space, where the!
  • the target search space is one of at least two of the search spaces provided by the network node;
  • a second receiving unit configured to receive, by using the target search space, a downlink control message of the scheduling random access response message sent by the network node.
  • An information transmission system includes: a network node and a UE;
  • the network node is configured to configure the PRACH configuration information corresponding to each search space and send the information to the UE; receive the physical random access channel PRACH message sent by the user equipment UE; and determine the target search according to the PRACH configuration information carried in the PRACH message.
  • a space where the target search space is one of at least two search spaces provided by a network node, each search space corresponding to a set of PRACH configuration information; and the scheduled random access response message is sent to the UE through the target search space.
  • the UE is configured to receive at least one set of physical random access channel (PRACH) configuration information that is sent by the network node, where the set of PRACH configuration information corresponds to one search space; and the PRACH configuration information corresponding to the target search space is sent to the network node.
  • PRACH message ; search through the target
  • the cable space receives a downlink control message of the scheduled random access response message sent by the network node.
  • the information transmission method, the network node, the user equipment, and the system provided by the embodiment of the present invention when the UE initiates the random access, may carry the PRACH configuration information corresponding to the target search space in the PRACH message, and the network node selects an appropriate search space for the UE.
  • the downlink control message is sent, and compared with the downlink control message that the network node sends the scheduled random access response message in each common search space in the prior art, the appropriate public search space may be selected according to the capability requirement of the UE to send the downlink to the UE.
  • the control message does not occupy the resource blocks of other common search spaces, thereby achieving the purpose of saving common search space resources, and the saved resources can be used to provide random access for other UEs, thereby increasing the random access capacity.
  • Embodiment 1 is a flowchart of an information transmission method in Embodiment 1 of the present invention.
  • Embodiment 2 is a flowchart of another information transmission method in Embodiment 1 of the present invention.
  • Embodiment 3 is a flowchart of an information transmission method in Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of a network node in Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural diagram of another network node in Embodiment 3 of the present invention.
  • FIG. 6 is a schematic diagram of a UE composition in Embodiment 3 of the present invention.
  • Figure ⁇ is a schematic diagram of another UE composition in Embodiment 3 of the present invention.
  • FIG. 8 is a schematic diagram showing the composition of an information transmission system in Embodiment 3 of the present invention.
  • An embodiment of the present invention provides an information transmission method, which can be applied to a network node side. As shown in FIG. 1, the method includes:
  • the network node is a device that provides a random access service for the UE on the network side, such as a radio network controller (RNC), an eNodeB, and the like.
  • RNC radio network controller
  • eNodeB eNodeB
  • the target search space is one of at least two search spaces provided by the network node, and each search space corresponds to a set of PRACH configuration information.
  • a set of PRACH configuration information is configured for each search space, and the UE can select a search space as the target search space according to its own capabilities.
  • the UE carries the PRACH configuration information corresponding to the target search space in the PRACH message.
  • the target search space can be determined according to the PRACH configuration information carried therein.
  • the network node may provide at least two search spaces, the target search space being one of a plurality of search spaces provided by the network node, in order not to send the same downlink control message to each of the at least two search spaces, The network node may determine, according to the PRACH configuration information carried in the PRACH message, the target search space that the UE has selected.
  • the PRACH configuration information may be configured on the network node side and sent to the UE in advance.
  • the pre-configured PRACH configuration information may identify different common search spaces, and each common search space corresponds to a set of PRACH configuration information. .
  • the search space may be: a PDCCH search space, or an e-PDCCH search space. Wait.
  • the downlink control message is used to schedule a random access response message, for example, for a PDCCH search space, the downlink control message is a PDCCH message; and for an e-PDCCH search space, the downlink control message is an e-PDCCH message.
  • search space referred to in this specification refers to a common search space that can be shared by multiple UEs, such as a common search space of the e-PDCCH and a common search space of the PDCCH.
  • a common search space of the e-PDCCH and a common search space of the PDCCH.
  • other public search spaces can also be entered, which can also be applied in the embodiments of the present invention.
  • the information sending method provided by the UE the UE carries the PRACH configuration information corresponding to the target search space in the PRACH message, and the network node selects an appropriate search space to send a downlink control message to the UE, and the network node in the prior art
  • the UE can select the appropriate common search space to send the downlink control message to the UE according to the capability requirement of the UE, and does not occupy the resource blocks of other common search spaces, thereby saving the public search.
  • the saved resources can be used to provide random access for other UEs, thereby increasing the random access capacity.
  • the embodiment of the present invention further provides an information transmission method, which can be applied to the UE side. As shown in FIG. 2, the method includes:
  • the user equipment UE receives at least one set of physical random access channel PRACH configuration information that is sent by the network node, where the target search space is one of at least two search spaces provided by the network node, and each search space corresponds to a group. PRACH configuration information.
  • the UE may receive the PRACH configuration information corresponding to each search space delivered by the network node, or the UE may only receive the PRACH configuration information corresponding to the search space, but the UE may only receive the PRACH configuration information corresponding to each search space.
  • a set of PRACH configuration information For example, if the UE only supports the PDCCH search space, only the PRACH configuration information corresponding to the PDCCH search space sent by the network node is received; if the UE supports the PDCCH and the e-PDCCH search space, the two sets of PRACH corresponding to the above two search spaces are received. Configuration information.
  • the UE may determine the target search space and then send the PRACH message after receiving at least two sets of PRACH configuration information in step 201. Specifically, the UE randomly selects one search space from the at least two search spaces supported by the UE or selects a search space as the target search space according to a predetermined priority order, and sends the PRACH configuration information corresponding to the selected target search space to the network node by using a PRACH message. .
  • the UE may first send a PRACH message and then determine a target search space according to the transmitted PRACH message. Specifically, the UE randomly selects or selects a set of PRACH configuration information from the at least two sets of PRACH configuration information to send to the network node by using a PRACH message, and then determines a corresponding target search space according to the sent PRACH configuration information. Receiving, by the target search space, a downlink control message delivered by the network node.
  • the UE supports only one search space, and the only supported search space is the default target search space.
  • the only part of the PRACH configuration information delivered by the network node can be received in step 201, and the received PRACH can be directly received.
  • the configuration information is sent to the PRACH message, and then the downlink control message delivered by the network node is received through the target search space.
  • the network node may determine the target search space according to the PRACH configuration information carried in the PRACH message, and send a downlink control message to the UE through the target search space.
  • the UE also determines the target search space by transmitting the PRACH message in step 202, so that the downlink control message can be detected only in the target search space.
  • the UE may carry the PRACH configuration information corresponding to the target search space in the PRACH message when the UE initiates the random access, so that the network node sends the downlink control message to the UE through the target search space, and the prior art Compared with the method in which the UE needs to simultaneously monitor multiple search spaces, the UE selects the target search space and receives the downlink control message through the target search space, By monitoring multiple search spaces at the same time, the purpose of saving UE processing resources is achieved.
  • An embodiment of the present invention provides an information transmission method, as shown in FIG. 3, including:
  • the network node configures PRACH configuration information corresponding to each search space and sends the information to the UE.
  • the PRACH configuration information is specifically at least one of the following: a PRACH configuration index, a frequency offset, preamble sequence information, resource allocation information, and modulation and coding information.
  • the user equipment UE receives at least one set of physical random access channel PRACH configuration information delivered by the network node, where a set of PRACH configuration information corresponds to one search space.
  • a set of PRACH configuration information is configured for each search space in advance on the network node, and is not only stored on the network node, but also sent to the UE.
  • the network node does not know what the search space supported by each UE is, so the PRACH configuration information for each search space can be sent to the UE.
  • the PRACH configuration information may be sent to the UE in any of the following forms: a broadcast channel, a system message, a radio resource control RRC signaling, and a reference signal.
  • PRACH configuration information can be explicitly carried in a broadcast channel message.
  • the PRACH configuration information may also be in an implicit form.
  • each search space corresponds to a channel state reference signal, and the corresponding search space may be determined by parsing the channel state reference signal.
  • the PRACH configuration information corresponding to the UE target search space sends a PRACH message to the network node, where the target search space is one of at least two of the search spaces provided by the network node.
  • the network node receives the physical random access channel PRACH message sent by the user equipment UE.
  • the form of the PRACH configuration information and the method for sending the PRACH message according to the PRACH configuration information are as follows:
  • a configuration index may correspond to a preamble sequence format of PRACH and a set of time domain PRACH resources.
  • the length of the PRACH message is configured by the preamble sequence format, the length of the cyclic prefix, and the like, and one search space corresponds to a preamble sequence format.
  • the time domain PRACH resource can be configured to send the PRACH in different subframes of different radio frames, corresponding to different search spaces.
  • the frequency offset corresponds to the PRACH frequency domain resource location, and different frequency domain resource locations correspond to different search spaces.
  • the system bandwidth is 100 resource blocks
  • the frequency resource of the PRACH message of a certain search space configured by the network node is some 6 consecutive resource blocks in the system bandwidth.
  • the preamble sequence information is sent to the UE after the network node specifies the preamble sequence for each search space.
  • the UE initiates the random access, the UE carries the preamble sequence corresponding to the target search space in the PRACH message.
  • the resource allocation information and the modulation and coding information may be used in the case where the PRACH message is an uplink packet. That is, when the UE initiates random access in the form of an uplink data packet, the resource block occupied by the uplink data packet, or the coding type, is set. Different resource blocks or different encoding types can represent different search spaces.
  • the network node determines a target search space according to the PRACH configuration information carried by the PRACH message.
  • the PRACH configuration information carried in the PRACH message may be matched with the PRACH configuration information corresponding to each search space configured on the network node.
  • the search search space that matches successfully is determined as the target search space.
  • the target search space refers to that the UE can support the search space, and the downlink control information sent by the network node can be detected in the search space. If the UE only supports the PDCCH search space, the PDCCH search space is the target search space. Alternatively, if the UE supports both the PDCCH search space and the e-PDCCH search space, after receiving the PRACH configuration information corresponding to the above two search spaces, one of the two search spaces may be selected as the target search space, according to the selected target. The PRACH configuration information corresponding to the search space sends a PRACH message.
  • the network node sends, by using the target search space, a downlink control message for scheduling a random access response message to the UE.
  • the UE receives, by using the target search space, a downlink control message of the scheduled random access response message sent by the network node.
  • the network node may determine the target search space, and send the downlink control message to the UE only through the search space, that is, send the e-PDCCH or PDCCH that schedules the random access response message to the UE. Since the network node only needs to use one search space to generate downlink control messages to the UE, it is not redundant. The time-frequency resources of other search spaces are occupied, and at the same time, downlink control messages are sent to other UEs through other search spaces, thereby improving the efficiency of random access and increasing the random access capacity.
  • the random access response message includes a temporary scrambling code allocated by the network node for the UE and some other timing configuration information.
  • the UE acquires a random access response message according to the downlink control message of the scheduled random access response message.
  • the temporary scrambling code is used for the UE to reply to the network node with an uplink service data packet containing the UE identification information according to the temporary scrambling code.
  • the UE sends an uplink service data packet to the network node, where the uplink service data packet carries the received temporary scrambling code and UE identification information.
  • the network node parses the temporary scrambling code and the UE identification information corresponding to the UE from the received uplink service data packet.
  • the temporary scrambling code is sent by the network node to the UE in step 305. Therefore, the network node may determine, according to the temporary scrambling code, that the UE is a UE that initiates random access, and obtain the UE identification information for subsequent communication use. Random access is successful.
  • the network node may send a downlink control message that is scrambled by the temporary scrambling code to the UE through the target search space, and establish a radio resource control link for subsequent communication.
  • the PRACH message may be an uplink data packet.
  • the UE may save the operation of sending the random access preamble sequence to the network node, and directly send an uplink data packet to the network node, where the uplink data packet carries the PRACH configuration information.
  • the network node can parse the PRACH configuration information from the uplink data packet, determine the target search space, and send the downlink control through the target search space.
  • the UE may carry the PRACH configuration information corresponding to the target search space in the PRACH message when the UE initiates the random access, and the network node selects an appropriate search space to send the downlink control message to the UE.
  • the network node sends the downlink control message for scheduling the random access response message in each common search space, and can be required according to the capability of the UE. Selecting a suitable common search space for the UE to send downlink control messages without occupying resource blocks of other common search spaces, thereby achieving the purpose of saving common search space resources, and the saved resources can be used to provide random access for other UEs, thereby increasing Random access capacity.
  • the search space described by the UE may be determined by the uplink data packet sent by the UE, the random access procedure is simplified, and the random access of the UE may be completed by using one uplink data packet, thereby improving the efficiency of random access.
  • Example 3
  • the embodiment of the present invention provides a network node.
  • the system includes: a receiving unit 41, a determining unit 42, and a sending unit 43.
  • the receiving unit 41 is configured to receive a physical random access channel (PRACH) message sent by the user equipment UE.
  • PRACH physical random access channel
  • the determining unit 42 is configured to determine a target search space according to the PRACH configuration information carried by the PRACH message received by the receiving unit 41.
  • the target search space is one of at least two search spaces provided by the network node, and each search space corresponds to a set of PRACH configuration information.
  • the PRACH configuration information is specifically at least one of the following: a PRACH configuration index, a frequency offset, preamble sequence information, resource allocation information, and modulation coding information.
  • the sending unit 43 is configured to send, by using the target search space determined by the determining unit 42, a downlink control message for scheduling a random access response message to the UE.
  • the network node may further include: a configuration unit 44.
  • the configuration unit 44 is configured to: before the receiving unit 41 receives the PRACH message sent by the UE, configure PRACH configuration information corresponding to each search space and send the information to the UE.
  • the PRACH configuration information is sent to the UE in any of the following forms: a broadcast channel, a system message, a radio resource control RRC signaling, and a reference signal.
  • the determining unit may be specifically configured to: configure the PRACH configuration information carried by the PRACH message with a PRACH corresponding to each search space configured on the network node. Set the information to match; determine the search search space that matches successfully as the target search space.
  • the search space may be: a physical downlink control channel, a PDCCH search space, or an enhanced physical downlink control channel e-PDCCH search space, or other common search space.
  • the downlink control message of the scheduled random access response message is: a PDCCH message, or an e-PDCCH message, or a downlink control message corresponding to another common search space.
  • the PRACH message may be not only a PRACH preamble sequence but also an uplink data packet.
  • the operation of transmitting the PRACH preamble sequence to the network node by the UE is omitted, and an uplink data packet is directly sent to the network node, and the uplink data packet carries information such as the PRACH configuration information of the UE.
  • the embodiment of the present invention provides a UE.
  • the UE includes: a first receiving unit 51, a sending unit 52, and a second receiving unit 53.
  • the first receiving unit 51 is configured to receive at least one set of physical random access channel PRACH configuration information that is sent by the network node, where the set of PRACH configuration information corresponds to one search space.
  • the sending unit 52 is configured to send, to the network node, a PRACH message according to the PRACH configuration information corresponding to the target search space, where the target search space is one of at least two search spaces provided by the network node.
  • the second receiving unit 53 is configured to: after the sending unit 52 sends a PRACH message to the network node according to the PRACH configuration information corresponding to the target search space, receive, by using the target search space, the scheduled random access sent by the network node.
  • the downlink control message of the response message is configured to: after the sending unit 52 sends a PRACH message to the network node according to the PRACH configuration information corresponding to the target search space, receive, by using the target search space, the scheduled random access sent by the network node.
  • the downlink control message of the response message is configured to: after the sending unit 52 sends a PRACH message to the network node according to the PRACH configuration information corresponding to the target search space, receive, by using the target search space, the scheduled random access sent by the network node.
  • the downlink control message of the response message is configured to: after the sending unit 52 sends a PRACH message to the network node according to the PRACH configuration information corresponding to the target search space, receive, by using the target search space, the scheduled random
  • the sending unit 52 may include: a first selecting module 521 and a first sending module 522.
  • the first selection module 521 is configured to randomly select one of the at least two search spaces supported by the UE or select a search space as the target search space according to a predetermined priority order.
  • the first sending module 522 is configured to send the PRACH configuration information corresponding to the target search space selected by the first selecting module 521 to the network node by using a PRACH message.
  • the sending unit 52 may include: a second sending module 523 and a second selecting module 524.
  • the second sending module 523 is configured to randomly select from the received at least one set of PRACH configuration information or select a set of PRACH configuration information according to a predetermined priority order to send to the network node by using a PRACH message.
  • the second selection module 524 is configured to determine a corresponding target search space according to the PRACH configuration information that the second sending module 523 has sent.
  • An embodiment of the present invention further provides an information transmission system, as shown in FIG. 8, including: a network node 61 and a user equipment UE62.
  • the network node 61 is configured to configure the PRACH configuration information corresponding to each search space and send the information to the UE; receive the physical random access channel PRACH message sent by the user equipment UE62; and determine the target according to the PRACH configuration information carried in the PRACH message.
  • a search space wherein the target search space is one of at least two search spaces provided by a network node, each search space corresponding to a set of PRACH configuration information; and the scheduled random access response is sent to the UE 62 through the target search space.
  • Downstream control message for the message.
  • the UE 62 is configured to receive the physical random access channel PRACH configuration information that is sent by the network node 61, where the set of PRACH configuration information corresponds to one search space, and send the PRACH to the network node 61 according to the PRACH configuration information corresponding to the target search space. a message, where the target search space is one of at least two of the search spaces provided by the network node; and the downlink control message of the scheduled random access response message sent by the network node 61 is received by the target search space.
  • the UE may carry the PRACH configuration information corresponding to the target search space in the PRACH message when the UE initiates the random access, and the network node selects an appropriate search space and sends the downlink to the UE.
  • the control message may be compared with the downlink control message that the network node sends the scheduled random access response message in each common search space in the prior art, and may select a suitable common search space to send the downlink control message to the UE according to the capability requirement of the UE. No need to occupy resource blocks of other common search spaces, to save public search space resources, section Independent resources can be used to provide random access to other UEs, thereby increasing random access capacity.
  • the search space described by the UE can be determined by the uplink data packet sent by the UE, the random access procedure is simplified, and the random access of the UE can be completed by using one uplink data packet, thereby improving the efficiency of random access.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation.
  • the computer software product of the present invention is stored in a readable storage medium, such as a floppy disk, a hard disk or an optical disk of a computer, and includes a plurality of instructions for causing a computer device (which may be a personal computer, The server, or network device, etc.) performs the methods described in various embodiments of the present invention.

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Abstract

La présente invention concerne, dans des modes de réalisation, un procédé de transmission d'informations, un nœud de réseau, un équipement utilisateur et un système, liés au domaine des technologies de la communication. Le procédé, le nœud de réseau, l'équipement utilisateur et le système peuvent économiser les ressources de l'espace de recherche commun et augmenter la capacité d'accès aléatoire. Le procédé de l'invention comprend les étapes suivantes : la réception du message de canal d'accès aléatoire physique (PRACH) envoyé par l'équipement utilisateur (UE) ; la détermination de l'espace de recherche d'objet, en fonction des informations de configuration du PRACH transportées par le message PRACH, l'espace de recherche d'objet étant l'un des au moins deux espaces de recherche fournis par le nœud de réseau et chaque espace de recherche correspondant à un groupe d'informations de configuration du PRACH ; l'envoi à l'UE du message de commande en liaison descendante, qui planifie le message d'accusé de réception à accès aléatoire, par le biais de l'espace de recherche d'objet. Les modes de réalisation de l'invention sont principalement utilisés dans la procédure de transmission d'informations pour l'accès aléatoire.
PCT/CN2012/077570 2012-06-26 2012-06-26 Procédé de transmission d'informations, nœud de réseau, équipement utilisateur et système WO2014000165A1 (fr)

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CN201280001151.8A CN103688588B (zh) 2012-06-26 2012-06-26 信息传输方法、网络节点、用户设备及系统
PCT/CN2012/077570 WO2014000165A1 (fr) 2012-06-26 2012-06-26 Procédé de transmission d'informations, nœud de réseau, équipement utilisateur et système

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