# Patent

## Title
Mobile communication system

## Abstract

An object is to perform a priority control that is more elaborate than that is performed by using a QCI. In a mobile communication system according to the present invention, a mobility management node MME notifies a radio base station eNB, in an “Initial Context Setup procedure” or an “E-RAB Setup Procedure”, following pieces of information in an associated form: an “E-RAB ID” of an E-RAB to be established between a gateway device S-GW and a mobile station UE; one QCI that is assigned to the E-RAB; and one FPI that is assigned to data flow transmitted on the E-RAB. A radio base station eNB establishes, in response to the notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station and one DRB corresponding to the E-RAB between the mobile station UE and the radio base station.

## Background
TECHNICAL FIELD
The present invention relates to a mobile communication system.
BACKGROUND ART
How congestion by U-Plane signals on a radio access network side can be avoided is explored in “UPCON (U-Plane Congestion Management) WI (Working Item)” of Release-12 of LTE (Long Term Evolution) system.
In recent years, text, images, videos, streaming, and the like, are transmitted together, even when service is sought from the same web browser.
In such a situation, when congestion occurs on the radio access network side, a preferred order for transmission is, for example, streaming, text, image, and video.
Presently, to control a QoS (Quality of Service), a priority control is implemented in an EPS (Enhanced Packet System) bearer by using a QCI (QoS Class Identifier).
PRIOR ART DOCUMENT
Non-Patent Document


    Non-Patent Document 1: 3GPP S2-130060


SUMMARY OF THE INVENTION
In “UPCON WI”, a solution is discussed to enable a more elaborate priority control. What is proposed is, in addition to a QCI, defining an “FPI (Flow Priority Indicator)”, which indicates a priority for each data flow (IP flow), and performing by (a scheduler of) a radio base station eNB a QoS control and a priority control with the FPI.
However, it is unclear as to how to implement the above solution, specifically, how to implement signaling (S1-AP and RRC) required for C-plane signals on the radio access network side is unclear.
The present invention is made in view of the above problem. An object of the present invention is to provide a mobile communication system capable of performing a priority control that is more elaborate than that is performed by using a QCI.
A mobile communication system according to an aspect of the present invention includes a mobility management node, a gateway device, a radio base station, and a mobile station. The mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form: identification information of a radio access bearer to be established between the gateway device and the mobile station, one bearer priority that is assigned to the radio access bearer, and one flow priority that is assigned to data flow transmitted on the radio access bearer. The radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station, and the radio base station establishes, in response to the notification, one data radio bearer corresponding to the radio access bearer between the mobile station and the radio base station.
A mobile communication system according to another aspect of the present invention includes a mobility management node, a gateway device, a radio base station, and a mobile station. The mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form: identification information of a radio access bearer to be established between the gateway device and the mobile station, one bearer priority that is assigned to the radio access bearer, and a list of flow priorities that is assigned to data flow transmitted on the radio access bearer. The radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station, and the radio base station establishes, in response to the notification, one or plural data radio bearers corresponding to the flow priorities in the list corresponding to the radio access bearer between the mobile station and the radio base station.
A mobile communication system according to still another aspect of the present invention includes a mobility management node, a gateway device, a radio base station, and a mobile station. The mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form: identification information of a radio access bearer to be established between the gateway device and the mobile station, one bearer priority that is assigned to the radio access bearer, and a list of flow priorities that is assigned to data flow transmitted on the radio access bearer. The radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station. The radio base station establishes, in response to the notification, one data radio bearer corresponding to the radio access bearer between the mobile station and the radio base station, and the radio base station instructs the mobile station to set up a priority in a PDCP corresponding to each of the flow priorities on the data radio bearer.



BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a diagram of an overall configuration of a mobile communication system according to a first embodiment of the present invention.
FIG. 2 is a diagram of a configuration of an EPS bearer in the mobile communication system according to the first embodiment of the present invention.
FIG. 3 is a diagram of an example of an “Initial Context Setup Request” transmitted by a mobility management node in the mobile communication system according to the first embodiment of the present invention.
FIG. 4 is a diagram of an example of an information element “E-RAB Level QoS Parameters” in the “Initial Context Setup Request” transmitted by the mobility management node in the mobile communication system according to the first embodiment of the present invention.
FIG. 5 is a diagram of an example of an “RRC Connection Reconfiguration” transmitted by a radio base station in the mobile communication system according to the first embodiment of the present invention.
FIG. 6 is a diagram of an example of an information element “Radio Resource Config Dedicated” in the “RRC Connection Reconfiguration” transmitted by the radio base station in the mobile communication system according to the first embodiment of the present invention.
FIG. 7 is a diagram of a configuration of an EPS bearer in a mobile communication system according to a second embodiment of the present invention.
FIG. 8 is a diagram of an example of an information element “E-RAB Level QoS Parameters” in an “Initial Context Setup Request” transmitted by a mobility management node in the mobile communication system according to the second embodiment of the present invention.
FIG. 9 is a diagram of an example of an “RRC Connection Reconfiguration” transmitted by a radio base station in the mobile communication system according to the second embodiment of the present invention.
FIG. 10 is a diagram of an example of an information element “Radio Resource Config Dedicated” in the “RRC Connection Reconfiguration” transmitted by the radio base station in the mobile communication system according to the second embodiment of the present invention.
FIG. 11 is a diagram of a configuration of an EPS bearer in a mobile communication system according to a third embodiment of the present invention.
FIG. 12 is a diagram of an example of an information element “E-RAB Level QoS Parameters” in an “Initial Context Setup Request” transmitted by a mobility management node in the mobile communication system according to the third embodiment of the present invention.
FIG. 13 is a diagram of an example of an “RRC Connection Reconfiguration” transmitted by a radio base station in the mobile communication system according to the third embodiment of the present invention.
FIG. 14 is a diagram of an example of an information element “Radio Resource Config Dedicated” in the “RRC Connection Reconfiguration” transmitted by the radio base station in the mobile communication system according to the third embodiment of the present invention.
FIG. 15 is a diagram of an example of an information element “PDCP-Config” within the information element “Radio Resource Config Dedicated” in the “RRC Connection Reconfiguration” transmitted by the radio base station in the mobile communication system according to the third embodiment of the present invention.



MODE FOR CARRYING OUT THE INVENTION
Mobile Communication System According to First Embodiment of Present Invention
The mobile communication system according to the first embodiment of the present invention will be explained with reference to FIG. 1 to FIG. 6.
As shown in FIG. 1, the mobile communication system according to the present embodiment includes a mobility management node MME, a gateway device P-GW, a gateway device S-GW, a radio base station eNB, and a mobile station UE.
As shown in FIG. 2, in the mobile communication system according to the present embodiment, each EPS bearer is constituted by one DRB (Data Radio Bearer), one S1 bearer, and one S5/S8 bearer.
The DRB is a data radio bearer established between the mobile station UE and the radio base station eNB, the S1 bearer is a bearer established between the radio base station eNB and the gateway device S-GW, and the S5/S8 bearer is a bearer established between the gateway device S-GW and the gateway device P-GW.
In the mobile communication system according to the present embodiment, each E-RAB (E-UTRAN Access Bearer) is constituted by one DRB and one S1 bearer.
In the mobile communication system according to the present embodiment, one EPS bearer, one E-RAB, and one DRB are established for each FPI, taking the application into consideration.
In other words, in the mobile communication system according to the present embodiment, one DRB, one S1 bearer, and one S5/S8 bearer are established per FPI.
Accordingly, in the mobile communication system according to the present embodiment, plural EPS bearers are established for data for the same best effort service.
In the mobile communication system according to the present embodiment, the mobility management node MME notifies the radio base station eNB, in an “Initial Context Setup procedure” or an “E-RAB Setup procedure” the following pieces of information in an associated form: an “E-RAB ID” of the E-RAB to be established between the gateway device S-GW and the mobile station UE; one QCI that is assigned to the E-RAB; and one FPI that is assigned to data flow transmitted on the E-RAB.
For example, the mobility management node MME notifies the following pieces of information in an associated form: the “E-RAB ID” of the E-RAB to be established between the gateway device S-GW and the mobile station UE by using an information element “E-RAB ID” in an “Initial Context Setup Request (see FIG. 3)”; one QCI that is assigned to the E-RAB by using an information element “QCI” in an information element “E-RAB Level QoS Parameters (see FIG. 4)” in the “Initial Context Setup Request (see FIG. 3)”; and one FPI that is assigned to the data flow transmitted on the E-RAB by using an information element “FPI” in the information element “E-RAB Level QoS Parameters (see FIG. 4)” in the “Initial Context Setup Request (see FIG. 3)”.
The radio base station eNB establishes, in response to the above notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station, and establishes one DRB corresponding to the E-RAB between the mobile station UE and the radio base station eNB.
For example, the radio base station eNB establishes one DRB corresponding to the E-RAB between the mobile station UE and the radio base station eNB by using an information element “Radio Resource Config Dedicated (see FIG. 6)” in an “RRC Connection Reconfiguration (see FIG. 5)”.
The radio base station eNB establishes the DRB corresponding to each of plural E-RAB between the mobile station UE and the radio base station eNB by using the information element “Radio Resource Config Dedicated (see FIG. 6)” in the “RRC Connection Reconfiguration (see FIG. 5)”, when, in the “Initial Context Setup procedure” or the “E-RAB Setup procedure”, the mobility management node MME is attempting to setup plural E-RAB in the radio base station eNB.
Mobile Communication System According to Second Embodiment of Present Invention
The mobile communication system according to the second embodiment of the present invention will be explained below with reference to FIG. 7 to FIG. 10 by focusing on how it differs from the mobile communication system according to the first embodiment.
As shown in FIG. 7, in the mobile communication system according to the present embodiment, each EPS bearer is constituted by plural DRB, one S1 bearer, and one S5/S8 bearer.
In the mobile communication system according to the present embodiment, each E-RAB is constituted by plural DRB and one S1 bearer.
Each S1 bearer is established for each QCI and each DRB is established for each FPI that is assigned to the data flow obtained after being transmitted via the S1 bearer of the same QCI.
In the mobile communication system according to the present embodiment, the mobility management node MME notifies the radio base station eNB, in the “Initial Context Setup procedure” or the “E-RAB Setup procedure”, the following pieces of information in an associated form: the “E-RAB ID”; the “QCI”; and an FPI list.
For example, the mobility management node MME notifies the following pieces of information in an associated form: the “E-RAB ID” of the E-RAB to be established between the gateway device S-GW and the mobile station UE by using the information element “E-RAB ID” in the “Initial Context Setup Request (see FIG. 3)”; one QCI that is assigned to the E-RAB by using the information element “QCI” in the information element “E-RAB Level QoS Parameters (see FIG. 8)” in the “Initial Context Setup Request (see FIG. 3)”; and the FPI list that includes one or plural FPI that are assigned to the data flow transmitted on the E-RAB by using an information element “FPI List” in the information element “E-RAB Level QoS Parameters (see FIG. 8)” in the “Initial Context Setup Request (see FIG. 3)”.
The radio base station eNB establishes, in response to the above notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station eNB, and establishes one or plural DRB corresponding to the FPI in the FPI list corresponding to the E-RAB between the mobile station UE and the radio base station eNB.
For example, the radio base station eNB establishes one or plural DRB corresponding to the E-RAB between the mobile station UE and the radio base station eNB by using the information element “Radio Resource Config Dedicated (see FIG. 10)” in the “RRC Connection Reconfiguration (see FIG. 9)”.
Mobile Communication System According to Third Embodiment of Present Invention
The mobile communication system according to the third embodiment of the present invention will be explained below with reference to FIG. 11 to FIG. 15 by focusing on how it differs from the mobile communication system according to the first embodiment.
As shown in FIG. 11, in the mobile communication system according to the present embodiment, each EPS bearer is constituted by one DRB, one S1 bearer, and one S5/S8 bearer.
In the mobile communication system according to the present embodiment, each E-RAB is constituted by one DRB and one S1 bearer.
In the mobile communication system according to the present embodiment, the radio base station eNB performs a priority control in a PDCP (Packet Data Convergence Protocol) layer based on a DFP (Data Flow Priority) corresponding to each FPI on each DRB.
In the mobile communication system according to the present embodiment, the mobility management node MME notifies the radio base station eNB, in the “Initial Context Setup procedure” or the “E-RAB Setup procedure”, the following pieces of information in an associated form: the “E-RAB ID”; the “QCI”; and an FPI list.
For example, the mobility management node MME notifies the following pieces of information in an associated form: the “E-RAB ID” of the E-RAB to be established between the gateway device S-GW and the mobile station UE by using the information element “E-RAB ID” in the “Initial Context Setup Request (see FIG. 3)”; one QCI that is assigned to the E-RAB by using the information element “QCI” in the information element “E-RAB Level QoS Parameters (see FIG. 12)” in the “Initial Context Setup Request (see FIG. 3)”; and the FPI list that includes one or plural FPI that are assigned to the data flow transmitted on the E-RAB by using the information element “FPI List” in the information element “E-RAB Level QoS Parameters (see FIG. 12)” in the “Initial Context Setup Request (see FIG. 3)”.
The radio base station eNB establishes, in response to the above notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station eNB, and establishes one or plural DRB corresponding to the FPI in the FPI list corresponding to the E-RAB between the mobile station UE and the radio base station eNB.
For example, the radio base station eNB establishes one or plural DRB corresponding to the E-RAB between the mobile station UE and the radio base station eNB by using the information element “Radio Resource Config Dedicated (see FIG. 14)” in the “RRC Connection Reconfiguration (see FIG. 13)”.
Moreover, the radio base station eNB instructs the mobile station UE, by using an information element “PDCP-Config (see FIG. 15)” in the information element “Radio Resource Config Dedicated (see FIG. 14)” in the “RRC Connection Reconfiguration (see FIG. 13)”, to set up the DFP on the DRB.
Modifications
The mobile communication system according to the first to third embodiments, in a “Handover Preparation procedure”, can be modified to hand over a setting pertaining to the above FPI from a handover source radio base station S-eNB to a handover target radio base station T-eNB.
When such a configuration is adopted, the handover target radio base station T-eNB can be modified to decide whether to set the EPS bearer by using the handed over setting pertaining to the FPI, in accordance with its own handling situation of the FPI, capability of the mobile station UE (“UE Capability”), and the like.
The characteristics of the above embodiments can also be realized as explained below.
A mobile communication system according to an aspect of the present invention includes a mobility management node MME, a gateway device S-GW, a radio base station eNB, and a mobile station UE. The mobility management node MME notifies the radio base station eNB, in an “Initial Context Setup Procedure (initial context setup procedure)” or an “E-RAB Setup Procedure (bearer setup procedure)”, following pieces of information in an associated form: an “E-RAB ID (identification information)” of an E-RAB (radio access bearer) to be established between the gateway device S-GW and the mobile station UE, one QCI (bearer priority) that is assigned to the E-RAB, and one FPI (flow priority) that is assigned to data flow transmitted on the E-RAB. The radio base station eNB establishes, in response to the notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station eNB, and the radio base station eNB establishes, in response to the notification, one DRB (data radio bearer) corresponding to the E-RAB between the mobile station UE and the radio base station eNB.
According to the above characteristic, a priority control that is more elaborate than that is performed by using the QCI can be performed without having to change the configuration of the existing EPS bearer.
A mobile communication system according to another aspect of the present invention includes a mobility management node MME, a gateway device S-GW, a radio base station eNB, and a mobile station UE. The mobility management node MME notifies the radio base station eNB, in an “Initial Context Setup Procedure” or an “E-RAB Setup Procedure”, following pieces of information in an associated form: an “E-RAB ID”, a QCI, and an FPI list. The radio base station eNB establishes, in response to the notification, one S1 bearer corresponding to the -E-RAB between the gateway device S-GW and the radio base station eNB, and the radio base station eNB establishes, in response to the notification, one or plural DRBs corresponding to the FPIs in the list corresponding to the E-RAB between the mobile station UE and the radio base station eNB.
According to the above characteristic, a priority control that is more elaborate than that is performed by using the QCI can be performed without having to increase the setting number of the S1 bearer and the S5/S8 bearer.
A mobile communication system according to still another aspect of the present invention includes a mobility management node MME, a gateway device S-GW, a radio base station eNB, and a mobile station UE. The mobility management node notifies the radio base station eNB, in an “Initial Context Setup Procedure” or an “E-RAB Setup Procedure”, following pieces of information in an associated form: an “E-RAB ID”, a QCI, and an FPI list. The radio base station eNB establishes, in response to the notification, one S1 bearer corresponding to the E-RAB between the gateway device S-GW and the radio base station eNB. The radio base station establishes eNB, in response to the notification, one DRB corresponding to the E-RAB between the mobile station UE and the radio base station eNB, and the radio base station eNB instructs the mobile station UE to set up a DFP (priority in a PDCP) corresponding to each of the FPIs on the DRB.
According to the above characteristic, a priority control that is more elaborate than that is performed by using the QCI can be performed without having to increase the setting numbers of eight bearers.
Operations of the above mobile station UE, the radio base station eNB, the mobility management node MME, and the gateway devices S-GW/P-GW can be realized with hardware or with software modules that are executed by processors, or with a combination of both.
The software modules can be provided in any type of a storage medium, such as a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM), a register, a hard disk, a removable disk, and a CD-ROM.
The storage medium is connected to a processor so as to be readable by the processor. The storage medium can be integrated with the processor. The storage medium and the processor can be provided within an ASIC. The ASIC can be provided within the mobile station UE, the radio base station eNB, the mobility management node MME, and the gateway devices S-GW/P-GW. In an alternative configuration, the storage medium and the processor can be provided as discrete components in the mobile station UE, the radio base station eNB, the mobility management node MME, and the gateway devices S-GW/P-GW.
The present invention has been explained in detail by using the abovementioned embodiment. However, it is obvious for a person skilled in the art that the present invention is not limited to the embodiment explained in the present description. The present invention can be implemented as modified and changed modes without deviating the gist and the range of the present invention specified by the claims. Accordingly, the indication of the present description aims at exemplary explanation, and has no intention to limit to the present invention.
The entire contents of Japanese Patent Application 2013-077040 (filed on Apr. 2, 2013) are incorporated in the description of the present application by reference.
INDUSTRIAL APPLICABILITY
As explained above, according to the present invention, it is possible to provide a mobile communication system capable of performing a priority control that is more elaborate than that is performed by using a QCI.










EXPLANATION OF REFERENCE NUMERALS


















UE
Mobile station



eNB
Radio base station



MME
Mobility management node



S-GW, P-GW
Gateway device

## Claims

1. A mobile communication system comprising a mobility management node, a gateway device, a radio base station, and a mobile station, wherein
the mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form,
identification information of a radio access bearer to be established between the gateway device and the mobile station,
one bearer priority that is assigned to the radio access bearer, and
one flow priority that is assigned to data flow transmitted on the radio access bearer,

the radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station, and
the radio base station establishes, in response to the notification, one data radio bearer corresponding to the radio access bearer between the mobile station and the radio base station.

2. A mobile communication system comprising a mobility management node, a gateway device, a radio base station, and a mobile station, wherein
the mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form,
identification information of a radio access bearer to be established between the gateway device and the mobile station,
one bearer priority that is assigned to the radio access bearer, and
a list of flow priorities that is assigned to data flow transmitted on the radio access bearer,

the radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station, and
the radio base station establishes, in response to the notification, one or plural data radio bearers corresponding to the flow priorities in the list corresponding to the radio access bearer between the mobile station and the radio base station.

3. A mobile communication system comprising a mobility management node, a gateway device, a radio base station, and
a mobile station, wherein the mobility management node notifies the radio base station, in an initial context setup procedure or a bearer setup procedure, following pieces of information in an associated form, identification information of a radio access bearer to be established between the gateway device and the mobile station, one bearer priority that is assigned to the radio access bearer, and
a list of flow priorities that is assigned to data flow transmitted on the radio access bearer, the radio base station establishes, in response to the notification, one S1 bearer corresponding to the radio access bearer between the gateway device and the radio base station, the radio base station establishes, in response to the notification, one data radio bearer corresponding to the radio access bearer between the mobile station and the radio base station, and
the radio base station instructs the mobile station to set up a priority in a Packet Data Convergence Protocol (PDCP) corresponding to each of the flow priorities on the data radio bearer.