Methods and apparatuses for configuring radio terminal with numerology of second RAT via first RAT
地域：
Tokyo
摘要
A second RAN node (2) associated with a second RAT sends a radio resource configuration of the second RAT to a radio terminal (3) via a first RAN node (1) associated with a first RAT. The radio resource configuration explicitly or implicitly indicates at least one numerology that is included in multiple numerologies supported by the second RAT and is different from a reference numerology. It is thus, for example, possible to allow a radio terminal to be configured with a numerology of a cell served by a secondary gNB or a target gNB in Inter-RAT Dual Connectivity between E-UTRA and NR and in a handover from E-UTRA to NR.
說明書
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This application is a National Stage Entry of International Application No. PCT/JP2017/041835, filed Nov. 21, 2017, which claims priority from Japanese Patent Application No. 2017-000798, filed Jan. 5, 2017. The entire contents of the above-referenced applications are expressly incorporated herein by reference.
The present disclosure relates to a radio communication system and, in particular, to communication in which a radio terminal simultaneously uses multiple cells of different Radio Access Technologies (RATS) operated by different radio stations.
The 3rd Generation Partnership Project (3GPP) has started in 2016 the standardization for the fifth generation mobile communication system (5G), i.e., 3GPP Release 14, to make it a commercial reality in 2020 or later, 5G is expected to be realized by continuous enhancement/evolution of LTE and LTE-Advanced and an innovative enhancement/evolution by an introduction of a new 5G air interface (i.e., a new Radio Access Technology (RAT)). The new RAT supports, for example, frequency bands higher than the frequency bands (e.g., 6 GHz or lower) supported by LTE/LTE-Advanced and its continuous evolution. For example, the new RAT supports centimeter-wave bands (10 GHz or higher) and millimeter-wave bands (30 GHz or higher).
權利要求
The invention claimed is:1. A second radio access network (RAN) node to be used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the second RAN node being associated with the second RAT, the second RAN node comprising:a memory; and at least one processor coupled to the memory and configured to:notify a first RAN node associated with the first RAT of a reference numerology that is included in multiple numerologies supported by the second RAT, in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node; and send a radio resource configuration of the second RAT to a radio terminal via the first RAN node, wherein the radio resource configuration indicates at least one numerology different from the reference numerology. 2. The second RAN node according to claim 1 , wherein each numerology includes at least one of subcarrier spacing, system bandwidth, a Transmission Time Interval length, subframe duration, slot duration, the number of slots per subframe, a Cyclic prefix length, symbol duration, and the number of symbols per subframe. 3. The second RAN node according to claim 1 , wherein the at least one processor is configured to generate the radio resource configuration for dual connectivity that uses the first RAT as a primary RAT and the second RAT as a secondary RAT. 4. The second RAN node according to claim 3 , wherein the at least one processor is configured to receive a radio bearer setup request from the first RAN node, select at least one numerology according to requirements for a radio bearer of the second RAT indicated by the radio bearer setup request, and include in the radio resource configuration an information element explicitly or implicitly indicating the selected at least one numerology. 5. The second RAN node according to claim 1 , wherein the at least one processor is configured to generate the radio resource configuration for an Inter-RAT handover of the radio terminal from the first RAT to the second RAT. 6. The second RAN node according to claim 1 , wherein the reference numerology defines a reference subframe configuration for a carrier that the second RAT supports. 7. The second RAN node according to claim 6 , wherein the at least one processor is configured to send to the radio terminal, via the first RAN node, a measurement configuration of at least one cell provided by the second RAN node on the carrier according to the reference numerology. 8. A first radio access network (RAN) node to be used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the first RAN node being associated with the first RAT, the first RAN node comprising:a memory; and at least one processor coupled to the memory and configured to;receive a reference numerology that is included in multiple numerologies supported by the second RAT, from a second RAN node associated with the second RAT, in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node; receive a radio resource configuration of the second RAT from the second RAN node; and send the radio resource configuration to a radio terminal, wherein the radio resource configuration indicates at least one numerology different from the reference numerology. 9. The first RAN node according to claim 8 , wherein the reference numerology defines a reference subframe configuration for a carrier that the second RAT supports. 10. The first RAN node according to claim 9 , wherein the at least one processor is configured to send, to the radio terminal, a measurement configuration of at least one cell provided by the second RAN node on the carrier according to the reference numerology. 11. A radio terminal to be used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the radio terminal comprising:at least one wireless transceiver configured to communicate with a first radio access network (RAN) node associated with the first RAT and communicate with a second RAN node associated with the second RAT; and at least one processor configured to receive a radio resource configuration of the second RAT from the second RAN node via the first RAN node, wherein a reference numerology that is included in multiple numerologies supported by the second RAT is sent from the second RAN node to the first RAN node in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node, and the radio resource configuration indicates at least one numerology different from the reference numerology. 12. The radio terminal according to claim 11 , wherein each numerology includes at least one of subcarrier spacing, system bandwidth, a Transmission Time Interval length, subframe duration, slot duration, the number of slots per subframe, a Cyclic prefix length, symbol duration, and the number of symbols per subframe. 13. The radio terminal according to claim 11 , wherein the at least one processor is configured to receive the radio resource configuration for dual connectivity that uses the first RAT as a primary RAT and the second RAT as a secondary RAT. 14. The radio terminal according to claim 11 , wherein the at least one processor is configured to receive the radio resource configuration for an Inter-RAT handover of the radio terminal from the first RAT to the second RAT. 15. The radio terminal according to claim 11 , wherein the reference numerology defines a reference subframe configuration for a carrier that the second RAT supports. 16. A method for a second radio access network (RAN) node used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the second RAN node being associated with the second RAT, the method comprising:notifying a first RAN node associated with the first RAT of a reference numerology that is included in multiple numerologies supported by the second RAT, in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node; and sending a radio resource configuration of the second RAT to a radio terminal via the first RAN node, wherein the radio resource configuration explicitly or implicitly indicates at least one numerology different from the reference numerology. 17. A method for a first radio access network (RAN) node used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the first RAN node being associated with the first RAT, the method comprising:receiving a reference numerology that is included in multiple numerologies supported by the second RAT, from a second RAN node associated with the second RAT, in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node; receiving a radio resource configuration of the second RAT from the second RAN node; and sending the radio resource configuration to a radio terminal, wherein the radio resource configuration indicates at least one numerology different from the reference numerology. 18. A method for a radio terminal used in a radio communication system that supports a first Radio Access Technology (RAT) and a second RAT, the method comprising:receiving a radio resource configuration of the second RAT from a second radio access network (RAN) node associated with the second RAT via a first RAN node associated with the first RAT, wherein a reference numerology that is included in multiple numerologies supported by the second RAT is sent from the second RAN node to the first RAN node in a setup procedure of an inter-RAN node interface between the first RAN node and the second RAN node, and the radio resource configuration indicates at least one numerology different from the reference numerology.
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