WO2018186782A1 - Transport de messages rrc dans une communication à double connectivité - Google Patents

Transport de messages rrc dans une communication à double connectivité Download PDF

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Publication number
WO2018186782A1
WO2018186782A1 PCT/SE2018/050091 SE2018050091W WO2018186782A1 WO 2018186782 A1 WO2018186782 A1 WO 2018186782A1 SE 2018050091 W SE2018050091 W SE 2018050091W WO 2018186782 A1 WO2018186782 A1 WO 2018186782A1
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WIPO (PCT)
Prior art keywords
rrc
base station
wireless terminal
message
rrc message
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PCT/SE2018/050091
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English (en)
Inventor
Oumer Teyeb
Alexander Vesely
Gino Masini
Gunnar Mildh
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2018186782A1 publication Critical patent/WO2018186782A1/fr

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Classifications

    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • 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
    • H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane

Definitions

  • the present disclosure is related to communications, and more particularly to wireless communications and related methods and base stations.
  • E-UTRAN supports Dual Connectivity (DC) operation whereby a multiple Rx/Tx UE in RRC CONNECTED is configured to utilize radio resources provided by two distinct schedulers, located in two eNBs connected via a non-ideal backhaul over the X2 interface (see 3 GPP 36.300).
  • eNBs involved in DC for a certain UE may assume two different roles: an eNB may either act as an MN (Master node) or as an SN (Secondary node). In DC, a UE is connected to one MN and one SN.
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • split bearers RRC is located in MN and SRBs (Signaling Radio Bearers) are always configured as MCG bearer type and therefore only use the radio resources of the MN.
  • FIG. 1 is a block diagram illustrating a Long Term Evolution (LTE) DC User Plane (UP).
  • LTE Long Term Evolution
  • UP DC User Plane
  • LTE-NR New Radio
  • LTE-NR tight interworking LTE-NR tight interworking
  • split bearer from the SN (known as SCG split bearer);
  • Figures 2 and 3 illustrate the UP and Control Plane (CP) architectures for LTE-NR tight interworking.
  • Split RRC messages are mainly used to create diversity, and the sender can decide to either choose one of the links for scheduling the RRC messages, or it can duplicate the message over both links.
  • a method may support dual connectivity (DC) communication for a wireless terminal using first and second base stations.
  • DC Radio Resource Control
  • Transmission of a Radio Resource Control (RRC) transport message may be initiated from the first base station to the second base station.
  • the RRC transport message may include an identification of the wireless terminal and an RRC message related to the wireless terminal.
  • the RRC transport message may be transmitted to the second base station using the Stream Control Transmission Protocol, SCTP.
  • SCTP Stream Control Transmission Protocol
  • a method may support dual connectivity (DC) communication for a wireless terminal using first and second base stations.
  • a Radio Resource Control (RRC) transport message may be received at the first base station from the second base station.
  • the RRC transport message may include an identification of the wireless terminal and an RRC message related to the wireless terminal.
  • the RRC transport message may be received from the second base station using the Stream Control Transmission Protocol, SCTP.
  • improved transport of RRC messages may be provided for a split radio bearer. A reliability of RRC transmission may thus be improved.
  • FIG. 1 is a block diagram illustrating a Long Term Evolution (LTE) User Plane (UP);
  • LTE Long Term Evolution
  • UP User Plane
  • FIG. 2 is a block diagram illustrating LTE - New Radio (NR) tight interworking UP
  • Figure 3 is a block diagram illustrating LTE - NR tight interworking Control Plane (CP);
  • Figure 4 illustrates transport network layers for data streams over X2 from 3 GPP TS
  • Figure 5 illustrates transport network layers for control plane signaling over X2 from 3 GPP TS 36.422;
  • Figures 6A and 6B illustrate RRC transport procedures according to some embodiments of inventive concepts;
  • FIG. 7 illustrates elements of an RRC transport message according to some embodiments of inventive concepts
  • FIG. 8 is a block diagram illustrating a wireless terminal (UE) according to some embodiments of inventive concepts
  • Figure 9 is a block diagram of a network node according to some embodiments of inventive concepts.
  • FIGS 10A and 10 B illustrate RRC transport procedures according to some additional embodiments of inventive concepts
  • Figure 11 illustrates elements of a response message according to some embodiments of inventive concepts
  • Figures 12 and 13 are flow charts illustrating network node operations according to some embodiments of inventive concepts.
  • Figures 14 and 15 are flow charts illustrating wireless terminal operations according to some embodiments of inventive concepts.
  • FIG. 8 is a block diagram illustrating elements of a wireless terminal UE (also referred to as a wireless device, a wireless communication device, a wireless communication terminal, user equipment, a user equipment node/terminal/device, etc.) configured to provide wireless communication according to embodiments of inventive concepts.
  • a wireless terminal UE also referred to as a wireless device, a wireless communication device, a wireless communication terminal, user equipment, a user equipment node/terminal/device, etc.
  • wireless terminal UE may include an antenna 807, and a transceiver circuit 801 (also referred to as a transceiver) including a transmitter and a receiver configured to provide uplink and downlink radio communications with a base station(s) of a radio access network.
  • Wireless terminal UE may also include a processor circuit 803 (also referred to as a processor) coupled to the transceiver circuit, and a memory circuit 805 (also referred to as memory) coupled to the processor circuit.
  • the memory circuit 805 may include computer readable program code that when executed by the processor circuit 803 causes the processor circuit to perform operations according to
  • processor circuit 803 may be defined to include memory so that a separate memory circuit is not required.
  • Wireless terminal UE may also include an interface (such as a user interface) coupled with processor 803, and/or wireless terminal UE may be incorporated in a vehicle.
  • operations of wireless terminal UE may be performed by processor 803 and/or transceiver 801.
  • processor 803 may control transceiver 801 to transmit communications through transceiver 801 over a radio interface to another UE and/or to receive communications through transceiver 801 from another UE over a radio interface.
  • modules may be stored in memory 805, and these modules may provide instructions so that when instructions of a module are executed by processor 803, processor 803 performs respective operations (e.g., operations discussed below with respect to Example Embodiments).
  • FIG. 9 is a block diagram illustrating elements of a node (also referred to as a network node, base station, eNB, eNodeB, etc.) of a Radio Access Network (RAN) configured to provide cellular communication according to embodiments of inventive concepts.
  • the network node may include a transceiver circuit 901 (also referred to as a transceiver) including a transmitter and a receiver configured to provide uplink and downlink radio communications with wireless terminals.
  • the network node may include a network interface circuit 907 (also referred to as a network interface) configured to provide communications with other nodes (e.g., with other base stations) of the RAN.
  • the network node may also include a processor circuit 903
  • the memory circuit 905 may include computer readable program code that when executed by the processor circuit 903 causes the processor circuit to perform operations according to embodiments disclosed herein. According to other embodiments, processor circuit 903 may be defined to include memory so that a separate memory circuit is not required.
  • operations of the network node may be performed by processor 903, network interface 907, and/or transceiver 901.
  • processor 903 may control transceiver 901 to transmit communications through transceiver 901 over a radio interface to one or more UEs and/or to receive communications through transceiver 901 from one or more UEs over a radio interface.
  • processor 903 may control network interface 907 to transmit communications through network interface 907 to one or more other network nodes and/or to receive communications through network interface from one or more other network nodes.
  • modules may be stored in memory 905, and these modules may provide instructions so that when instructions of a module are executed by processor 903, processor 903 performs respective operations (e.g., operations discussed below with respect to Example Embodiments).
  • the network node may be implemented as a control node without a transceiver.
  • transmission to a wireless terminal may be initiated by the network node so that transmission to the wireless terminal is provided through a network node including a transceiver, e.g., through a base station.
  • initiating transmission may include transmitting through the transceiver.
  • the forwarding of data packets between the MN and SN is handled by using the X2 User plane protocol that employs GTP-U (3 GPP TS 36.425, 3 GPP TS 36.424).
  • Figure 4 illustrates a transport network layer for data streams over X2 (taken from 3 GPP TS 36.424). It is specified in 36.424 that:
  • the GTP-U PDU includes a RAN Container with flow control information as specified in TS 36.425 which is carried in the GTP-U extension header.
  • the transport bearer is identified by the GTP-U TEID (TS 29.281) and the IP address of the MeNB and SeNB respectively. There may be zero or one UL data stream and there is one DL data stream per E-RAB at the X2 interface;
  • the DL data stream is used for DL data transmission from the MeNB to the
  • the UL data stream is used for UL data transmission from the SeNB to the
  • the packet processing function in the MeNB shall send downstream packets of a given E- RAB to the SeNB IP address (received in X2AP) associated to the DL transport bearer of that particular E-RAB.
  • the packet processing function in the SeNB shall send upstream packets of a given E-RAB to the MeNB IP address (received in X2AP) associated to the UL transport bearer of that particular E-RAB;
  • • data forwarding may be performed by MeNB providing GTP-U TEID to receive the DL data forwarded by the SeNB.
  • CP RRC messages For split SRBs, the same mechanism as above can be used. However, the transport of CP RRC messages have different requirements than that of UP data messages. Thus, just creating one more tunnel via GTP-U mapped for an SRB may not be sufficient, as GTP-U doesn't support reliability. However, reliability may be important for the transport of CP RRC messages as these messages may contain critical configuration information that will impact the behaviour of the UE/network.
  • sending the CP RRC messages over the same interface as the data may cause delay because the high priority CP messages may end up being blocked by the user plane traffic (which is likely to be much larger in size and also arrive at a higher rate compared to the CP data).
  • the issue of transporting RRC messages that belong to a split SRB between the MN and SN may be addressed. This may be achieved by introducing a new message in the X2AP CP protocol which is based on SCTP and thus offers reliable transmission.
  • advantages of using an X2 AP message rather than adopting the current mechanisms of forwarding packets between the MN and SN for split DRBs may include:
  • Figure 5 illustrates a Transport network layer for control plane signaling over X2 (taken from 3 GPP TS 36.422)
  • inventive concepts may also be applicable to other DC cases such as between two NR nodes.
  • This disclosure refers to the interface between the MN and SN as X2, based on the
  • ⁇ SN and SeNB are used interchangeably
  • the present disclosure introduces two new procedures called "MN-to-SN RRC transport” and “SN-to-MN RRC transport” that will be used to transport RRC messages between the MN and SN, as illustrated in Figure 6.
  • a purpose of these procedures is to transport split RRC messages between the master and secondary nodes.
  • FIG. 6 illustrates an RRC transport procedure.
  • the MN/SN decides to employ RRC diversity and send a PDCP PDU that corresponds to an SRB message over the secondary link, it creates an "RRC transport" message and sends it to the SN/MN via the X2 AP.
  • the contents of this message are shown in the table of Figure 7.
  • the MeNB/SeNB X2AP IDs are the IDs used to uniquely identify the UE over the X2 interface at the MN and SN.
  • the SRB-K identifies to which SRB is this message is mapped to, and it can take values 1,2 or 3 corresponding to SRBl, SRB2, or SRB3 (where SRB3 is the direct SRB from the SN to the UE, assuming that could be split). Note that the values 1,2 and 3 are just exemplary values and any other three distinct values could be used instead.
  • the priority is an optional field that is used to indicate a priority that the receiver of this message (SN if the message was from the MN, and vice versa) applies for this message as compared to other messages.
  • a MN can set this to Priority2 if the RRC message has been sent (or scheduled to be sent) also over the master leg (i.e. RRC duplication) and to Priority 1 if it is not scheduled to be sent over the master leg.
  • RRC duplication i.e. RRC duplication
  • Priority 1 if it is not scheduled to be sent over the master leg.
  • the SN gets this message, if it is an overload situation in the DL, it can give messages with Priorityl over those that have Priority2. Other values might also be used to create more granularity and hence more scheduling differentiation.
  • the Data contains the PDCP PDU that is corresponding to the RRC message.
  • the PDCP When the PDCP gets an SRB data, it adds a PDCP header (1 byte) as well as a MAC-I element for integrity verification (4 bytes long) [3 GPP 36.323).
  • the sender in this case has all the information it needs to make the corresponding RRC transport (i.e. it knows the concerned UE and as such the MeNB/SeNB X2AP IDs, the SRB -ID, priority, etc... )
  • UE SRB 1/2 data destined for the MN is split and sent via the SN leg and arrives at the SN RLC.
  • the RLC packet will arrive at the RLC entity corresponding to SRB 1/2 (this entity is setup/configured during the establishment/reconfiguration of the SN leg of the split SRBl/2). Since the SN knows from which entity this packet is arriving, it will know that the packet contains an SRB 1/2 data destined for the MN, and will set the SRB-K ) that corresponds to SRB 1/2 when forming the SN-to-MN RRC transport message.
  • UE SRB3 data destined for the SN is split and sent via the MN leg and arrives at the MN RLC.
  • the RLC packet will arrive at the RLC entity corresponding to SRB3 (this entity is setup/configured during the establishment/reconfiguration of the MN leg of the split SRB3). Since the MN knows from which entity this packet is arriving, it will know that the packet contains an SRB3 destined for the SN, and will set the SRB-K ) that corresponds to SRB3 when forming the MN-to-SN RRC transport message.
  • the Priority information element may have more relevance in the DL case as compared to the UL because in the UL case, the data is sent over the X2 directly to the receiver node.
  • the received message must be forwarded to the UE over a radio that is shared by several UEs.
  • the priority information may not be readily available in the UL case (e.g. in case 1 above, the SN may not be aware whether this data was duplicated on both legs or just sent over the SN leg of the split SRB 1/2).
  • Figure 10 is a signaling diagram illustrating an alternative RRC transport procedure according to some embodiments of inventive concepts. The main difference from the procedure of Figure 6 is that here there is an optional response to the message. An example realization of this optional response message is shown in the table of Figure 11.
  • the "RRC Transport Request" also referred to as an "RRC transport request message” may be the same as the "RRC Transport” of Figure 6.
  • the sender node i.e., the node that sends the RRC transport request message
  • the receiver node i.e., the node that receives the RRC transport request message
  • ⁇ set as "Unsuccessful operation" if the receiver node (i.e., the node that received the RRC transport request message) was not able to execute the transport of the included RRC message to the UE
  • the reason for the failure can be included in the Failure Cause information element.
  • An advantage of this alternative way of providing an RRC message transport procedure is that it could provide information to the sender node that may not be available at the sender node when the sender node has decided to route the RRC data via the receiver node.
  • the MN may have decided to send the RRC message via the SN leg because a measurement report from the UE has indicated that the radio conditions between the UE and the SN are more favorable than that between the UE and MN.
  • this may not provide information about the load situation at the SN, and the SN might not be able to send the data to the UE, despite the good radio conditions, because it is overloaded.
  • the MN may decide to send the pending and future RRC messages via the MN leg instead.
  • a response message indicating that e.g., the overload condition
  • the MN may decide to send the pending and future RRC messages via the MN leg instead.
  • another option is to use separate messages, for example, MN-to-SN/SN-to-MN RRC transport Acknowledge for successful operation and MN-to-SN/SN-to-MN RRC transport failure for unsuccessful operation.
  • a positive response may be sent back immediately on the reception of the request (for example, if the receiver sees that the load in the system is very low), or it could be after the RRC message has been successful transmitted to the UE or it could even be after acknowledgements for the RLC packets corresponding to the forwarded message are received from the UE, signifying the message has arrived at the UE.
  • a negative response can be sent back immediately on the reception of the request (for example, if the receiver sees that the load in the system is very high), or it could be after noticing the RRC message has not been successfully transmitted to the UE (e.g. within a certain time) or it could even be after receiving negative acknowledgements for the RLC packets corresponding to the forwarded message (e.g. even after maximum retransmission at the RLC level have been tried), signifying the message has not been received at the UE.
  • the SRB-ID value of 3 may be used for this case as well.
  • the MN gets an SN-to-MN RRC transport message with SRB-K ) value of 3 and SRB3 has not been configured, it will know that this is referring to an embedded SRB message and constructs a new MN RRC message that contains the received RRC message in a container. This message may contain nothing but the received RRC message or as mentioned above, the MN may add additional information relevant to the MN leg as well.
  • the RRC of the UE corresponding to the MN receives this message, it can extract the embedded RRC message and forwards it to the other RRC entity in the UE corresponding to the SN.
  • an ID other than 1..3 (e.g. 4) may be used.
  • the behavior of the MN and the UE will be the same as in the previous case described above when SRB-ID 3 was employed.
  • modules may be stored in memory 905 of Figure 9, and these modules may provide instructions so that when the instructions of a module are executed by processor 903, processor 903 performs respective operations of the flow chart of Figure 12.
  • processor 903 of the first base station may receive an outer RRC message from the wireless terminal through transceiver 901, wherein an inner RRC message is embedded in the outer RRC message.
  • the inner RRC message may be an RRC message related to the wireless terminal.
  • processor 903 of the first base station may extract the inner RRC message from the outer RRC message responsive to receiving the outer RRC message with the inner RRC message embedded therein.
  • processor 903 of the first base station may initiate transmission of a Radio Resource Control (RRC) transport message through network interface 907 to the second base station.
  • RRC transport message may include an identification of the wireless terminal and the inner RRC message that was embedded in the outer RRC message.
  • the RRC transport message may be transmitted to the second base station using the Stream Control Transmission Protocol, SCTP.
  • the RRC transport message may include a data portion that includes the inner RRC message.
  • the data portion may include a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) that includes a PDCP header and a PDCP Service Data Unit (SDU) that includes the RRC message.
  • PDCP Packet Data Convergence Protocol
  • PDU Packet Data Unit
  • SDU PDCP Service Data Unit
  • the identification of the wireless terminal may include a first identification that uniquely identifies the wireless terminal at an X2 interface of the first base station and a second identification that uniquely identifies the wireless terminal at an X2 interface of the second base station.
  • the RRC transport message may include a Signaling Radio Bearer (SRB) identification (ID) that identifies an SRB to which the RRC message is mapped.
  • SRB Signaling Radio Bearer
  • ID Signaling Radio Bearer
  • the SRB may be a split SRB having a first leg over a first radio interface between the first base station and the wireless terminal and a second leg over a second radio interface between the second base station and the wireless terminal.
  • modules may be stored in memory 905 of Figure 9, and these modules may provide instructions so that when the instructions of a module are executed by processor 903, processor 903 performs respective operations of the flow chart of Figure 13.
  • processor 903 of the first base station may receive a Radio Resource Control (RRC) transport message from the second base station through network interface 907. Moreover, the RRC transport message may include an identification of the wireless terminal and an RRC message related to the wireless terminal. The RRC transport message may be received from the second base station using the Stream Control Transmission Protocol, SCTP. At block 1303, processor 903 of the first base station may embed the RRC message related to the wireless terminal in an outer RRC message responsive to receiving the RRC transport message including the RRC message related to the wireless terminal. At block 1305, processor 903 of the first base station may initiate transmission of the outer RRC message including the RRC message embedded therein through transceiver 901 to the wireless terminal.
  • RRC Radio Resource Control
  • the RRC transport message of block 1301 may include a data portion comprising the RRC message.
  • the data portion may include a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) including a PDCP header and a PDCP Service Data Unit (SDU) including the RRC message.
  • PDCP Packet Data Convergence Protocol
  • PDU Packet Data Unit
  • SDU PDCP Service Data Unit
  • the identification of the wireless terminal may include a first identification that uniquely identifies the wireless terminal at an X2 interface of the first base station and a second identification that uniquely identifies the wireless terminal at an X2 interface of the second base station.
  • the RRC transport message may include a Signaling Radio Bearer (SRB) identification (ID) that identifies an SRB to which the RRC message is mapped.
  • SRB Signaling Radio Bearer
  • ID Signaling Radio Bearer
  • the SRB may be a split SRB having a first leg over a first radio interface between the first base station and the wireless terminal and a second leg over a second radio interface between the second base station and the wireless terminal.
  • modules may be stored in memory 805 of Figure 8, and these modules may provide instructions so that when the instructions of a module are executed by processor 803, processor 803 performs respective operations of the flow chart of Figure 14.
  • processor 803 may receive an outer Radio Resource Control (RRC) message from the first base station through transceiver 801, wherein an inner RRC message is embedded in the outer RRC message.
  • RRC Radio Resource Control
  • processor 803 may process the outer RRC message through a first protocol stack associated with the first base station to extract the inner RRC message responsive to receiving the outer RRC message.
  • processor 803 may process the inner RRC message through at least a portion of a second protocol stack associated with the second base station responsive to extracting the inner RRC message.
  • Processing the outer RRC message at block 1403 may include processing the outer RRC message through a first RRC layer of the first protocol stack associated with the first base station to extract the inner RRC message
  • processing the inner RRC message at block 1405 may include processing the inner RRC message through a second RRC layer of the second protocol stack.
  • processing the inner RRC message through at least a portion of the second protocol stack may include processing the inner RRC message through the second RRC layer of the second protocol stack without processing the inner RRC message through a second PHY layer of the second protocol stack, without processing the inner RRC message through a second MAC layer of the second protocol stack, without processing the inner RRC message through a second RLC layer of the second protocol stack, and without processing the inner RRC message through a second PDCP layer of the second protocol stack.
  • the inner RRC message may be mapped to a Signaling Radio Bearer (SRB) including a radio link between the second base station and the wireless terminal.
  • SRB Signaling Radio Bearer
  • processor 803 may transmit data through transceiver 801 over a Data Radio Bearer (DRB) to the second base station based on the inner RRC message.
  • processor 803 may receive data from the second base station over a Data Radio Bearer (DRB) based on the inner RRC message.
  • DRB Signaling Radio Bearer
  • the inner RRC message may be mapped to a Signaling Radio Bearer (SRB) including a radio link between the second base station and the wireless terminal.
  • SRB Signaling Radio Bearer
  • processor 803 may perform a measurement based on the inner RRC message.
  • processor 803 may transmit information based on the measurement through transceiver 801 to at least one of the first and second base stations. Moreover, transmitting the information may include transmitting the information through transceiver 801 to the second base station.
  • modules may be stored in memory 805 of Figure 8, and these modules may provide instructions so that when the instructions of a module are executed by processor 803, processor 803 performs respective operations of the flow chart of Figure 15.
  • processor 803 may generate an inner Radio Resource Control (RRC) message.
  • RRC Radio Resource Control
  • processor 803 may generate an outer RRC message, wherein the inner RRC message is embedded in the outer RRC message.
  • processor 803 may transmit the outer RRC message with the inner RRC message embedded therein through transceiver 801 to the first base station.
  • Generating the outer RRC message at block 1503 may include generating the outer RRC message using a first RRC layer of a first protocol stack associated with the first base station, and generating the inner RRC message at block 1501 may include generating the inner RRC message using a second RRC layer of a second protocol stack associated with the second base station. Moreover, generating the inner RRC message may include generating the inner RRC message using the second RRC layer without using a second PDCP layer of the second protocol stack, without using a second RLC layer of the second protocol stack, without using a second MAC layer of the second protocol stack, and without using a second PHY layer of the second protocol stack.
  • the inner RRC message may be mapped to a Signaling Radio Bearer (SRB) including a radio link between the second base station and the wireless terminal.
  • SRB Signaling Radio Bearer
  • a method supporting dual connectivity, DC, communication for a wireless terminal using first and second base stations comprising: initiating transmission of a Radio Resource Control, RRC, transport message from the first base station to the second base station, wherein the RRC transport message includes an identification of the wireless terminal and an RRC message related to the wireless terminal.
  • RRC Radio Resource Control
  • Embodiment 3 The method of Embodiment 2 wherein the data portion comprises a Packet Data Convergence Protocol, PDCP, Packet Data Unit, DPU, including a PDCP header and a PDCP Service Data Unit, SDU, including the RRC message.
  • PDCP Packet Data Convergence Protocol
  • DPU Packet Data Unit
  • SDU Packet Service Data Unit
  • the identification of the wireless terminal includes a first identification that uniquely identifies the wireless terminal at an X2 interface of the first base station and a second identification that uniquely identifies the wireless terminal at an X2 interface of the second base station.
  • Embodiment 7 The method of Embodiment 6, wherein the SRB is a split SRB having a first leg over a first radio interface between the first base station and the wireless terminal and a second leg over a second radio interface between the second base station and the wireless terminal.
  • the priority indicator is set to one of a high priority responsive to determining that the RRC message is to be transmitted to the wireless terminal from the second base station and not from the first base station, and a low priority responsive to determining that the RRC message is to be transmitted to the wireless terminal from both of the first and second base stations.
  • initiating transmission of the RRC transport message comprises initiating transmission of the RRC transport message responsive to generating the RRC message related to the wireless terminal for transmission to the wireless terminal.
  • initiating transmission of the RRC transport message comprises initiating transmission of the RRC transport message responsive to receiving the RRC message from the wireless terminal.
  • initiating transmission of the RRC transport message comprises initiating transmission of the RRC transport message responsive to receiving the RRC message from the wireless terminal.
  • Embodiment 17 further comprising: responsive to receiving the response indicating unsuccessful operation at the second base station, initiating transmission of the RRC message from the first base station to the wireless terminal.
  • the response includes at least one of an identification that uniquely identifies the wireless terminal at an X2 interface of the first base station, an identification that uniquely identifies the wireless terminal at an X2 interface of the second base station, and a Signaling Radio Bearer, SRB, identification, ID, that identifies an SRB to which the RRC message is mapped.
  • SRB Signaling Radio Bearer
  • the inner RRC message is embedded in the outer RRC message; and responsive to receiving the outer RRC message with the inner RRC message embedded therein, extracting the inner RRC message from the outer RRC message; wherein the RRC transport message includes the identification of the wireless terminal and the inner RRC message that was embedded in the outer RRC message.
  • Embodiment 26 further comprising: initiating transmission of data to the wireless terminal based on the RRC message, wherein the data is transmitted over a split Data Radio Bearer, DRB, having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • DRB Data Radio Bearer
  • initiating transmission of the data comprises at least one of: initiating transmission of the data from the first base station to the wireless terminal using the first data leg over the first data radio interface; and initiating transmission of the data from the first base station through the second base station to the wireless terminal using the second data leg over the second data radio interface.
  • Embodiment 26 further comprising: receiving data from the wireless terminal based on the RRC message, wherein the data is received over a split Data Radio Bearer, DRB, having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • DRB split Data Radio Bearer
  • receiving the data comprises at least one of: receiving the data at the first base station from the wireless terminal using the first data leg over the first data radio interface; and receiving the data at the first base station from the wireless terminal through the second base station using the second data leg over the second data radio interface.
  • receiving the RRC transport message is transmitted to the second base station using the Stream Control Transmission Protocol, SCTP.
  • initiating transmission includes transmitting the RRC transport message from the first base station to the second base station.
  • a method supporting dual connectivity, DC, communication for a wireless terminal using first and second base stations comprising: receiving a Radio Resource Control, RRC, transport message at the first base station from the second base station, wherein the RRC transport message includes an identification of the wireless terminal and an RRC message related to the wireless terminal.
  • RRC Radio Resource Control
  • PDCP Packet Data Unit
  • DPU Packet Data Unit
  • Service Data Unit including the RRC message.
  • the identification of the wireless terminal includes a first identification that uniquely identifies the wireless terminal at an X2 interface of the first base station and a second identification that uniquely identifies the wireless terminal at an X2 interface of the second base station.
  • Embodiment 39 The method of Embodiment 38, wherein the SRB is a split SRB having a first leg over a first radio interface between the first base station and the wireless terminal and a second leg over a second radio interface between the second base station and the wireless terminal.
  • Embodiment 43 The method of Embodiment 42, wherein the priority indicator is set to one of a high priority indicating that the RRC message is to be transmitted to the wireless terminal from the first base station and not from the second base station, and a low priority indicating that the RRC message is to be transmitted to the wireless terminal from both of the first and second base stations.
  • Embodiment 49 The method of Embodiment 48 wherein the failure cause indicates an overload condition at the first base station.
  • the response includes at least one of an identification that uniquely identifies the wireless terminal at an X2 interface of the first base station, an identification that uniquely identifies the wireless terminal at an X2 interface of the second base station, and a Signaling Radio Bearer, SRB, identification, ID, that identifies an SRB to which the RRC message is mapped.
  • SRB Signaling Radio Bearer
  • the method of any of Embodiments 33-43 and 45-50 further comprising: responsive to receiving the RRC transport message including the RRC message related to the wireless terminal, modifying the RRC message related to the wireless terminal to provide a modified RRC message related to the wireless terminal; embedding the modified RRC message related to the wireless terminal in an outer RRC message; and initiating transmission of the outer RRC message including the modified RRC message therein from the first base station to the wireless terminal.
  • Embodiment 55 further comprising: initiating transmission of data to the wireless terminal based on the RRC message, wherein the data is transmitted over a split Data Radio Bearer, DRB, having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • DRB Data Radio Bearer
  • initiating transmission of the data comprises at least one of: initiating transmission of the data from the first base station to the wireless terminal using the first data leg over the first data radio interface; and initiating transmission of the data from the first base station through the second base station to the wireless terminal using the second data leg over the second data radio interface.
  • Embodiment 55 further comprising: receiving data from the wireless terminal based on the RRC message, wherein the data is received over a split Data Radio Bearer, DRB, having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • DRB split Data Radio Bearer
  • receiving the data comprises at least one of: receiving the data at the first base station from the wireless terminal using the first data leg over the first data radio interface; and receiving the data at the first base station from the wireless terminal through the second base station using the second data leg over the second data radio interface.
  • a network node comprising: a transceiver configured to provide wireless network communication with a wireless terminal; a network interface configured to provide network communication with other network nodes; and a processor coupled with the transceiver and the network interface, wherein the processor is configured to provide communication with the wireless terminal through the transceiver, wherein the processor is configured to provide communication with the other network nodes through the network interface, and wherein the processor is configured to perform operations according to any of Embodiments 1-61.
  • the network node of Embodiment 62 wherein the network interface is an X2 network interface.
  • a network node wherein the network node is adapted to perform operations according to any of Embodiments 1-61.
  • a network node wherein the network node includes modules configured to perform operations according to any of Embodiments 1-61.
  • a method of operating a wireless terminal supporting dual connectivity, DC, communication using first and second base stations in a wireless communication network comprising: receiving an outer Radio Resource Control, RRC, message from the first base station, wherein an inner RRC message is embedded in the outer RRC message; responsive to receiving the outer RRC message, processing the outer RRC message through a first protocol stack associated with the first base station to extract the inner RRC message; and responsive to extracting the inner RRC message, processing the inner RRC message through at least a portion of a second protocol stack associated with the second base station.
  • RRC Radio Resource Control
  • processing the outer RRC message comprises processing the outer RRC message through a first RRC layer of the first protocol stack associated with the first base station to extract the inner RRC message
  • processing the inner RRC message comprises processing the inner RRC message through a second RRC layer of the second protocol stack.
  • processing the outer RRC message comprises processing the outer RRC message through a first PHY layer of the first protocol stack, a first MAC layer of the first protocol stack, a first RLC layer of the first protocol stack, a first PDCP layer of the first protocol stack, the first RRC layer of the first protocol stack.
  • processing the inner RRC message through at least a portion of the second protocol stack comprises processing the inner RRC message through the second RRC layer of the second protocol stack without processing the inner RRC message through a second PHY layer of the second protocol stack, without processing the inner RRC message through a second MAC layer of the second protocol stack, without processing the inner RRC message through a second RLC layer of the second protocol stack, and without processing the inner RRC message through a second PDCP layer of the second protocol stack.
  • Embodiment 70 wherein the SRB is a split SRB having a first signaling leg over a first signaling radio interface between the first base station and the wireless terminal and a second signaling leg over a second signaling radio interface between the second base station and the wireless terminal.
  • DRB Data Radio Bearer
  • Embodiments 72 wherein the DRB is a split DRB having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • transmitting the data comprises at least one of: transmitting the data from the wireless terminal to the first base station using the first data leg over the first data radio interface; and transmitting the data from the wireless terminal to the second base station using the second data leg over the second data radio interface.
  • Embodiment 70-71 further comprising: receiving data from the second base station over a Data Radio Bearer, DRB, based on the inner RRC message.
  • DRB Data Radio Bearer
  • the DRB is a split DRB having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • receiving the data comprises at least one of: receiving the data at the wireless terminal from the first base station using the first data leg over the first data radio interface; and receiving the data at the wireless terminal from first base station using the second data leg over the second data radio interface.
  • Embodiments 66-79 further comprising: performing a measurement based on the inner RRC message; and transmitting information based on the measurement to at least one of the first and second base stations.
  • Embodiment 80 comprises transmitting the information to the second base station.
  • Embodiment 80-81 The method of any of Embodiment 80-81 wherein the measurement includes at least one of a signal quality measurement and/or a received signal power measurement.
  • a method of operating a wireless terminal supporting dual connectivity, DC, communication using first and second base stations in a wireless communication network comprising: generating an inner Radio Resource Control, RRC, message; generating an outer RRC message, wherein the inner RRC message is embedded in the outer RRC message; and transmitting the outer RRC message with the inner RRC message embedded therein to the first base station.
  • RRC Radio Resource Control
  • generating the outer RRC message comprises generating the outer RRC message using a first RRC layer of a first protocol stack associated with the first base station.
  • generating the outer RRC message further comprises generating the outer RRC message using a first PDCP layer of the first protocol stack, using a first RLC layer of the first protocol stack, using a first MAC layer of the first protocol stack, and using a PHY layer of the first protocol layer.
  • generating the inner RRC message comprises generating the inner RRC message using a second RRC layer of a second protocol stack associated with the second base station.
  • generating the RRC message comprises generating the RRC message using the second RRC layer without using a second PDCP layer of the second protocol stack, without using a second RLC layer of the second protocol stack, without using a second MAC layer of the second protocol stack, and without using a second PHY layer of the second protocol stack.
  • Embodiment 89 The method of Embodiment 88, wherein the SRB is a split SRB having a first signaling leg over a first signaling radio interface between the first base station and the wireless terminal and a second signaling leg over a second signaling radio interface between the second base station and the wireless terminal.
  • Embodiments 88-89 further comprising: transmitting data from the wireless terminal over a Data Radio Bearer, DRB, to the second base station based on the inner RRC message.
  • DRB Data Radio Bearer
  • the DRB is a split DRB having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • transmitting the data comprises at least one of: transmitting the data from the wireless terminal to the first base station using the first data leg over the first data radio interface; and transmitting the data from the wireless terminal to the second base station using the second data leg over the second data radio interface.
  • Embodiment 88-89 further comprising: receiving data from the second base station over a Data Radio Bearer, DRB, based on the inner RRC message.
  • DRB Data Radio Bearer
  • the DRB is a split DRB having a first data leg over a first data radio interface between the first base station and the wireless terminal and a second data leg over a second data radio interface between the second base station and the wireless terminal.
  • receiving the data comprises at least one of: receiving the data at the wireless terminal from the first base station using the first data leg over the first data radio interface; and receiving the data at the wireless terminal from first base station using the second data leg over the second data radio interface.
  • a wireless terminal comprising: a transceiver configured to provide wireless communication in a wireless communication network; and a processor coupled with the transceiver, wherein the processor is configured to provide wireless network communication through the transceiver, wherein the processor is configured to perform operations according to any of Embodiments 66-97.
  • a wireless terminal UE, wherein the wireless terminal includes modules configured to perform operations according to any of Embodiments 66-97.
  • a network node comprising: a network interface configured to provide network communication with other network nodes; and a processor coupled with the network interface, wherein the processor is configured to provide communication with other network nodes through the network interface, and wherein the processor is configured to perform operations according to any of Embodiments 1 -61.
  • the terms “comprise”, “comprising”, “comprises”, “include”, “including”, “includes”, “have”, “has”, “having”, or variants thereof are open-ended, and include one or more stated features, integers, elements, steps, components or functions but does not preclude the presence or addition of one or more other features, integers, elements, steps, components, functions or groups thereof.
  • the common abbreviation “e.g.”, which derives from the Latin phrase “exempli gratia” may be used to introduce or specify a general example or examples of a previously mentioned item, and is not intended to be limiting of such item.
  • the common abbreviation “i.e.”, which derives from the Latin phrase “id est,” may be used to specify a particular item from a more general recitation.
  • Example embodiments are described herein with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits.
  • These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).

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

Abstract

Selon un premier mode de réalisation donné à titre d'exemple, un procédé peut prendre en charge une communication à double connectivité (DC) pour un terminal sans fil à l'aide de première et seconde stations de base. La transmission d'un message de transport de commande de ressources radio (RRC) peut être lancée de la première station de base à la seconde station de base. Le message de transport RRC peut comprendre une identification du terminal sans fil et un message RRC associé au terminal sans fil. Le message de transport RRC peut être transmis à la seconde station de base à l'aide du protocole de transmission de commande de flux (SCTP).
PCT/SE2018/050091 2017-04-07 2018-02-05 Transport de messages rrc dans une communication à double connectivité WO2018186782A1 (fr)

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