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WO2015063589A2 - Procédé de transmission d'une pdu au statut rlc dans un système de communication acceptant une double connectivité - Google Patents

Procédé de transmission d'une pdu au statut rlc dans un système de communication acceptant une double connectivité Download PDF

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Publication number
WO2015063589A2
WO2015063589A2 PCT/IB2014/002609 IB2014002609W WO2015063589A2 WO 2015063589 A2 WO2015063589 A2 WO 2015063589A2 IB 2014002609 W IB2014002609 W IB 2014002609W WO 2015063589 A2 WO2015063589 A2 WO 2015063589A2
Authority
WO
WIPO (PCT)
Prior art keywords
logical channel
base station
connection
user equipment
rlc status
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/IB2014/002609
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English (en)
Other versions
WO2015063589A3 (fr
Inventor
Pingping Wen
Chandrika Worrall
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.)
Alcatel Lucent SAS
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Alcatel Lucent SAS
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 Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Publication of WO2015063589A2 publication Critical patent/WO2015063589A2/fr
Publication of WO2015063589A3 publication Critical patent/WO2015063589A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present disclosure relates to wireless communication network, and particularly to a method for transmitting RLC status PDU and reporting the corresponding BSR in a user equipment or a base station of a wireless communication system supporting dual connectivity.
  • the user equipment 130 is in the coverage of the MeNB (main eNB) 110 and the SeNB (secondary eNB) 120 simultaneously.
  • the user equipment 130 could establish a first connection with the MeNB 110 and a second connection with the SeNB 120 simultaneously.
  • the MeNB 110 could use RLC acknowledge mode to send data to the user equipment 130, at this time, the user equipment 130 functioned as the receiver side needs to feedback the RLC status PDU to the MeNB 110 in the uplink; at the meanwhile, the SeNB 120 could also use the RLC acknowledge mode to send data to the user equipment 130 and at this time the user equipment 130 functioned as the receiver side needs to feedback the RLC status PDU to the SeNB 120 in the uplink.
  • the transmission side sends RLC PDU and the receiver side sends a corresponding RLC status PDU to feedback the ACK or NACK information of the received data packet to the receiver side
  • each bearer corresponds to an RLC entity and a logical channel and the receiver side sends the RLC status PDU in the logical channel having the same identifier with the logical channel corresponding to the RLC entity from the receiver side, so as to identify the RLC status PDU is the feedback corresponding to which RLC entity and then the following problem will be occur in the dual connectivity scenario, namely the receiver side does not configure a logical channel having the same identifier with the logical channel of the corresponding RLC entity from the transmission side for the radio bearer, thereby the conventional method can
  • the invention provides a method for transmitting RLC status PDU in a communication device of a wireless communication system supporting dual connectivity, wherein the wireless communication system includes a first base station, a second base station and a user equipment, and the RLC is acknowledge mode and the user equipment does not support bearer splitting in uplink transmission, the method comprising the following steps:
  • the user equipment establishing a first connection with the first base station and a second connection with the second base station respectively, and the first base station and the second base station configuring logical channels for the radio bearers of the user equipment transmitted on the first connection and the second connection;
  • the communication device transmits the RLC status PDU
  • the communication device transmits the RLC status PDU according to a predetermined rule.
  • the method according to the present invention establishes dual connectivity and then determines the transmission mode of the RLC status PDU adopted by the communication device based on the logical channels configured for the bearers of the downlink and uplink. Therefore, the method according to the present invention could send the RLC status PDU correctly in case of any logical channel configuration.
  • the predetermined rule in the step (c2) is:
  • the communication device maintaining at least one virtual logical channel in uplink transmission or the downlink transmission, the identifier of the at least one virtual logical channel being the same as a first logical channel identifier or a third logical channel identifier;
  • the communication device transmitting a corresponding RLC status PDU to the first base station or the user equipment via a corresponding virtual logical channel from the at least one virtual logical channel.
  • the RLC status PDU could be sent via a virtual logical channel correctly in case of mismatching of the uplink and downlink logical channel configurations.
  • the user equipment when a BSR corresponding to the RLC status PDU needs to be reported, the user equipment also reports a corresponding BSR to the first base station and/or the second base station via a corresponding virtual logical channel from the at least one virtual logical channel.
  • the BSR could be sent with a virtual logical channel when the BSR needs to be sent.
  • the predetermined rule in the step (c2) is:
  • the communication device sending RLC status PDU corresponding to a first logical channel in downlink via a second logical channel in uplink of the first connection or sending RLC status PDU corresponding to a third logical channel in uplink via a fourth logical channel in downlink of the first connection, wherein the communication device indicates whether the identifiers of the logical channel corresponding to the data on the position corresponding to the MAC PDU and the logical channel in the MAC PDU header are the same via the R-bit in a first MAC PDU header;
  • the corresponding RLC status PDU could be transmitted via a conventional logical channel with a different logical channel identifier instead of transmitting the RLC status PDU with a virtual logical channel.
  • the above mentioned schema is achieved by indicate the logical channel corresponding to the RLC status PDU via a first RLC status PDU format or a fixed mapping relationship.
  • the communication device analyzes the R-bit in the first MAC PDU to determine whether the identifiers of the logical channel corresponding to the data on the position corresponding to the MAC PDU and the logical channel in the MAC PDU header are the same;
  • the communication device analyzes the first RLC status PDU format to determine the logical channel identifier corresponding to the RLC status PDU.
  • the receiver side could analyze the R-bit in the first MAC PDU header and the first RLC status PDU format to determine the corresponding information.
  • the user equipment transmits the BSR for the RLC status PDU corresponding to the first logical channel via BSR field corresponding to the second logical channel in BSR MAC CE according to the fixed mapping relationship, wherein the user equipment indicates that the BSR is the BSR for the data transmitted via the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel having the mapping relationship with the second logical channel via the R-bit in the second MAC PDU header corresponding to the BSR MAC CE.
  • the BSR information could also be reported via a conventional logical channel with a different logical channel identifier instead of a virtual logical channel.
  • the first base station and/or the second base station analyze the R-bit in the second MAC PDU to determine that the BSR is the BSR for the data transmitted on the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel which has the mapping relationship with a second logical channel.
  • the first or the second base station functioned as the receiver side could analyze the R-bit in the second MAC PDU header to determine the BSR is the BSR for the data transmitted via the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel having the fixed mapping relationship with the second logical channel.
  • the user equipment receives the fixed mapping relationship from the first base station and/or the second base station.
  • the first base station and/or the second base station could form the fixed mapping relationship according to the present invention and then send it to the user equipment.
  • the user equipment receives the fixed mapping relationship from the first base station and/or the second base station via RRC signaling.
  • the first base station in the step (b) cooperates with the second base station to configure logical channels for the radio bearers of the user equipment transmitted on the first connection and the second connection, such that a uplink logical channel corresponding to any of bearers of the user equipment transmitted in uplink of the first connection or the second connection and a downlink logical channel corresponding to a bearer transmitted in downlink of the first connection or the second connection have the same logical channel identifier, or a downlink logical channel corresponding to any of bearers of the first base station or the second base station transmitted in downlink of the first connection or the second connection and a uplink logical channel corresponding to a bearer transmitted in uplink of the first connection or the second connection have the same logical channel identifier.
  • the first base station and the second base station could be coordinated first and then a logical channel with the same logical channel identifier could be found in the corresponding downlink logical channels corresponding to the uplink on the first connection or the second connection, or a logical channel with the same logical channel identifier could be found in the corresponding uplink logical channels corresponding to the downlink on the first connection or the second connection.
  • the method could achieve correct RLC status PDU sending in dual connectivity system without any amendment in the user equipment side.
  • the first base station in the step (b) cooperates with the second base station via Xn interface to configure logical channels for the radio bearers of the user equipment transmitted on the first connection and the second connection, such that a uplink logical channel corresponding to any of bearers of the user equipment transmitted in uplink of the first connection or the second connection and a downlink logical channel corresponding to a bearer transmitted in downlink of the first connection or the second connection have the same logical channel identifier, or a downlink logical channel corresponding to any of bearers of the first base station or the second base station transmitted in downlink of the first connection or the second connection and a uplink logical channel corresponding to a bearer transmitted in uplink of the first connection or the second connection have the same logical channel identifier.
  • the communication device is the user equipment, the first base station or the second base station.
  • the communication device of the present invention could be the user equipment, the first base station or the second base station.
  • the first base station is a main base station when the second base station is a secondary base station, or the first base station is a secondary base station when the second base station is a main base station.
  • Fig. l illustrates a scenario in which the method according to the present invention could be applied
  • Fig.2 illustrates a flow chart of a method according to the present invention
  • Fig.3 illustrates an example of MAC header with 7 bits L field
  • Fig.4 illustrates an example of MAC header with 15 bits L field
  • Fig.5 illustrates an MAC PDU header for BSR reporting according to the present invention.
  • Fig. l illustrates a scenario in which the method according to the present invention could be applied. This scenario has been described in the prior art and thus a repeated description thereof will be omitted here.
  • the method is a method 200 for transmitting RLC status PDU in a communication device of a wireless communication system supporting dual connectivity, wherein the wireless communication system includes a first base station, a second base station and a user equipment, and the RLC is acknowledge mode and the user equipment does not support bearer splitting in uplink transmission, the method comprising the following steps:
  • the user equipment 130 illustrated in Fig. l establishes a first connection with the first base station 110 and a second connection with the second base station 120 respectively, and the first base station 10 and the second base station 120 configure logical channels for radio bearers of the user equipment 130 transmitted on the first connection and the second connection.
  • a logical channel with the same first logical channel identifier as a first logical channel allocated for a bearer of downlink transmission on the first connection is allocated for any of the radio bearers of the uplink transmission on the first connection or a logical channel with the same third logical channel identifier as a third logical channel allocated for a bearer of uplink transmission on the first connection is allocated for any of the radio bearers of the downlink transmission on the first connection: in particular, for example, if the first base station 110 allocates a logical channel (Logic_Channel_l) with the logical channel identifier "1" used for the downlink data transmission for a radio bearer transmitted in downlink of the first connection established with the user equipment, then it is determined whether a logical channel used for uplink transmission with the logical channel identifier "1" is also allocated for a radio bearer transmitted in uplink of the first connection established with the user equipment.
  • Logic_Channel_l logical channel
  • logical channels configured for uplink may have five channels with the logical channel identifiers of "1", “2", “3", “4" and “5", while the logical channels configured for downlink may only have channels with the logical channel identifiers of "3" and "4", such a configuration also complies with the determination above, namely the determination result is "yes";
  • the base station functions as the receiver side
  • logical channels configured for the downlink may have five channels with the logical channel identifiers of "1", “2", “3”, “4" and "5"
  • the logical channels configured for uplink may have channels with the logical channel identifiers of "1" and "2"
  • step 232 the communication device transmits the RLC status PDU and the transmission schema is the same as the method in the prior art;
  • step 234 the method enters into step 234 and in the step 234 the communication device transmits the RLC status PDU according to a predetermined rule.
  • the method according to the present invention establishes dual connectivity first and then determines the transmission mode of the RLC status PDU adopted by the communication device based on the logical channels configured for the bearers of downlink and uplink. Therefore, the method according to the present invention could send the RLC status PDU correctly in case of any logical channel configurations.
  • the first base station 110 cooperates with the second base station to configure logical channel for the radio bearer of the user equipment 130 transmitted on the first connection and the second connection, such that a uplink logical channel corresponding to any of bearers of the user equipment 130 transmitted in uplink of the first connection or the second connection and a downlink logical channel corresponding to a bearer transmitted in downlink of the first connection or the second connection have the same logical channel identifier, or a downlink logical channel corresponding to any of bearers of the first base station or the second base station transmitted in downlink of the first connection or the second connection and a uplink logical channel corresponding to a bearer transmitted in uplink of the first connection or the second connection have the same logical channel identifier.
  • the method according to the present invention enters into step 232 after the determination and in this method step the communication device transmits the corresponding RLC status PDU and the transmission schema is the same as the conventional method.
  • the method could achieve correct RLC status PDU sending in dual connectivity system without any modification in the user equipment side.
  • the first base station 110 cooperates with the second base station 120 via Xn interface to configure logical channels for the radio bearers of the user equipment 130 transmitted on the first connection and the second connection, such that a uplink logical channel corresponding to any of bearers of the user equipment transmitted in uplink of the first connection or the second connection and a downlink logical channel corresponding to a bearer transmitted in downlink of the first connection or the second connection have the same logical channel identifier, or a downlink logical channel corresponding to any of bearers of the first base station 110 or the second base station 120 transmitted in downlink of the first connection or the second connection and a uplink logical channel corresponding to a bearer transmitted in uplink of the first connection or the second connection have the same logical channel identifier.
  • the predetermined rule in the step 234 is: the communication device maintaining at least one virtual logical channel in uplink transmission or downlink transmission, the identifier of the at least one virtual logical channel is the same as a first logical channel identifier or a third logical channel identifier, at this time the communication device transmits a corresponding RLC status PDU to the first base station 110 or the user equipment 130 via a corresponding virtual logical channel from the at least one virtual logical channel.
  • the RLC status PDU could be sent via a virtual logical channel correctly in case of mismatching of the uplink and downlink logical channel configurations.
  • the user equipment when a BSR corresponding to the RLC status PDU needs to be reported, the user equipment also reports a corresponding BSR to the first base station 110 and/or the second base station 120 via a corresponding virtual logical channel from the at least one virtual logical channel.
  • the communication device maintains a virtual logical channel with the logical channel identifier "2" for uplink transmission, so as to send the corresponding RLC status PDU correctly.
  • the BSR could be sent with a virtual logical channel when the BSR needs to be sent.
  • the predetermined rule in the step 234 also could be:
  • the communication device sending RLC status PDU corresponding to a first logical channel of the downlink via a second logical channel in uplink of the first connection or sending RLC status PDU corresponding to a third logical channel of the uplink via a fourth logical channel in downlink of the first connection, wherein the communication device indicates whether the identifiers of the logical channel corresponding to the data on the position corresponding to the MAC PDU and the logical channel in the MAC PDU header are the same via the R-bit in a first MAC PDU header;
  • Fig.3 illustrates an example of MAC header with 7 bits L field
  • Fig.4 illustrates an example of MAC header with 15 bits L field.
  • the R-bit could be defined to indicate whether the identifiers of the logical channel corresponding to the data on the position corresponding to the MAC PDU and the logical channel in the MAC PDU header are the same or not, for example, "1" represents they are the same and "0" represents they are different. When they are different, it is needed to indicate the RLC status PDU transmitted by the logical channel with the logical channel identifier is transmitted for which logical channel.
  • the communication device analyzes the R-bit in the first MAC PDU to determine whether the identifiers of the logical channel corresponding to the data on the position corresponding to the MAC PDU and the logical channel in the MAC PDU header are the same; and the communication device analyzes the first RLC status PDU format to determine the logical channel identifier corresponding to the RLC status PDU.
  • the receiver side could analyze the R-bit in the first MAC PDU header and the first RLC status PDU format to determine the corresponding information.
  • the second technical solution is to indicate the relationship between the second logical channel on uplink and the first logical channel in downlink or between the third logical channel in downlink and the fourth logical channel in uplink via a fixed mapping relationship, wherein the user equipment 130 receives the fixed mapping relationship.
  • the user equipment 130 transmits the BSR for the RLC status PDU corresponding to the first logical channel via BSR field corresponding to the second logical channel in BSR MAC CE according to the fixed mapping relationship, wherein the user equipment 130 indicates that the BSR is the BSR for the data transmitted via the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel having the mapping relationship with the second logical channel via the R-bit in the second MAC PDU header corresponding to the BSR MAC CE.
  • the BSR information could also be reported via a conventional logical channel with a different logical channel identifier instead of a virtual logical channel.
  • Fig.5 illustrates an MAC PDU header for BSR reporting according to the present invention.
  • the R-bit definition in Fig.5 is similar with the definition in Fig.3 and Fig.4.
  • "1" represents that the BSR is the BSR for the data transmitted via the second logical channel
  • "0" represents that the BSR is the BSR for the RLC status PDU corresponding to the first logical channel having the fixed mapping relationship with the second logical channel.
  • the first base station 110 and/or the second base station 120 could analyze the R-bit in the second MAC PDU header to determine that the BSR is the BSR for the data transmitted via the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel having the fixed mapping relationship with the second logical channel.
  • the first base station or the second base station functioned as the receiver side could analyze the R-bit in the second MAC PDU header to determine the BSR is the BSR for the data transmitted via the second logical channel or the BSR for the RLC status PDU corresponding to the first logical channel having the fixed mapping relationship with the second logical channel.
  • the user equipment 130 receives the fixed mapping relationship from the first base station 110 and/or the second base station 120.
  • the first base station 110 and/or the second base station 120 could form the fixed mapping relationship according to the present invention and then send it to the user equipment.
  • the user equipment 130 receives the fixed mapping relationship from the first base station 110 and/or the second base station 120 via RRC signaling.
  • the communication device is the user equipment, the first base station or the second base station. Because the method, excluding the BSR reporting, described in the present invention could be implemented in the base station or the user equipment functioned as the receiver side, the communication device of the present invention could be the user equipment, the first base station or the second base station.
  • the first base station is a main base station when the second base station is a secondary base station, or the first base station is a secondary base station when the second base station is a main base station.
  • any reference numerals in the claims shall not be construed as limiting the scope of the claims in question; the term “comprising” will not preclude an device(s) or step(s) which is(not) listed in another claim(s) or the description; “a/an” preceding a device will not preclude the presence of a plurality of such devices; one or more functions of a plurality of devices included in an apparatus can be performed by the same module in hardware or software; and the terms “first”, “second”, etc., are intended to merely designate a name but not to represent any specific order.

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

Abstract

L'invention concerne un procédé de transmission d'une PDU au statut RLC dans un dispositif de communication d'un système de communications sans fil acceptant une double connectivité. Le système comprend des première et seconde stations de base et un équipement d'utilisateur, le statut RLC correspond au mode acquittement, et l'équipement d'utilisateur ne prend pas en charge la division de support dans une transmission en liaison montante. Tout d'abord, une première connexion avec la première station de base et une seconde connexion avec la seconde station de base sont respectivement établies. La première et la seconde station de base configurent des canaux logiques pour les supports radio de l'équipement d'utilisateur transmis sur la première connexion et la seconde connexion. Il est ensuite déterminé si un canal logique ayant le même identifiant de premier canal logique qu'un premier canal logique attribué à un support de transmission en liaison descendante sur la première connexion est attribué à l'un des supports radio de la transmission en liaison montante sur la première connexion ou si un canal logique ayant le même identifiant de troisième canal logique qu'un troisième canal logique attribué à un support de transmission en liaison montante sur la première connexion est attribué à l'un des supports radio de la transmission en liaison descendante sur la première connexion. Si c'est le cas, le dispositif de communication transmet alors la PDU au statut RLC. Sinon, le dispositif de communication transmet la PDU au statut RLC selon une règle prédéterminée.
PCT/IB2014/002609 2013-11-01 2014-10-30 Procédé de transmission d'une pdu au statut rlc dans un système de communication acceptant une double connectivité Ceased WO2015063589A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310535002.6A CN104602294B (zh) 2013-11-01 2013-11-01 双连接通信系统中用于传输rlc状态pdu的方法
CN201310535002.6 2013-11-01

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WO2015063589A2 true WO2015063589A2 (fr) 2015-05-07
WO2015063589A3 WO2015063589A3 (fr) 2015-08-27

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CN108964945B (zh) * 2017-05-18 2021-09-14 华为技术有限公司 一种配置方法、数据接收方法和相关设备
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CN111418259B (zh) * 2017-12-19 2023-08-22 Oppo广东移动通信有限公司 一种辅小区的控制方法、设备及计算机存储介质
CN113728720B (zh) * 2018-11-01 2025-03-18 中兴通讯股份有限公司 用于集成接入和回程链路的承载映射
CN111586803B (zh) 2019-02-15 2021-09-07 华为技术有限公司 一种通信方法及相关设备
CN110677925B (zh) * 2019-08-30 2021-08-20 华为技术有限公司 一种无线承载处理的方法及终端设备

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CN104602294B (zh) 2018-08-21
CN104602294A (zh) 2015-05-06
WO2015063589A3 (fr) 2015-08-27

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