CN101848497A - Method and system for establishing data radio bearer (DRB) - Google Patents
Method and system for establishing data radio bearer (DRB) Download PDFInfo
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Abstract
The invention discloses a method and a system for establishing a data radio bearer (DRB). The method comprises the following steps that: a relay node (RN) indicates DRB resource information which needs establishing initially to a mobility management entity (MME) in an evolution packet core (EPC) in the attachment process of user equipment (UE); after receiving the indication which shows the DRB resource information which needs establishing initially, the MME transmits a bearer establishing configuration parameter to a donor evolution node B (DeNB) which provides service for the RN; and after receiving the bearer establishing configuration parameter, the DeNB performs the initial DRB establishment of a Un interface through the reconfiguration process of radio resource control (RRC) at the Un interface. The method and the system can establish the DRB when the RN starts.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and a system for establishing a data radio bearer.
Background
After the Long Term Evolution (LTE) technology of 3GPP, the 3GPP organization continues to enhance the LTE scheme, which is called LTE-enhanced (LTE-a) technology, i.e. LTE-a is a subsequent Evolution of LTE technology.
In the LTE-a technology, a Relay Node (RN) is added to the architecture of an access network. The RN may be considered as an extension of an evolved base station (eNB), providing more economical coverage for the system. The RN is connected with the eNB through a wireless interface, and the RN can enhance the coverage quality at the edge of the coverage of the eNB and can also be deployed outside the coverage area of the eNB to expand the coverage range.
Fig. 1 is a schematic diagram of an RN in an existing LTE-a networking. As shown in fig. 1, an eNB providing a radio access service to an RN is referred to as a Donor base station (DeNB, Donor eNB); the RN and the DeNB are connected through a wireless Un interface, and the RN and User Equipment (UE) are connected through a Uu interface of LTE; the RN is connected with a Mobility Management Entity/Serving Gateway (MME/SGW) of a core network through an S1 interface to provide service for the UE; this S1 interface is switched over by the DeNB, i.e. the DeNB acts as a forwarding node for the S1 interface.
The DeNB in the architecture shown in fig. 1 includes a relay function, which is represented by S1 interface application protocol (S1AP) signaling of the S1 control plane and S1 user plane data both arriving at the DeNB first, and the DeNB also knows that signaling and data arrive, can parse and modify them, and then forward them to the RN or Evolved Packet Core (EPC).
For the RN architecture currently discussed by 3GPP, the DeNB performs proxy (proxy) function, and the cell of the RN can be regarded as a cell under the DeNB.
Fig. 2 is a diagram illustrating a RN start-up procedure in a conventional RN architecture. As shown in FIG. 2, the RN initiation procedure is similar to the past, and only differs somewhat in the S1 and X2 interface establishment. Regardless of how many MME and neighbor eNB, the RN only needs to establish one S1/X2 interface and terminates at the DeNB. The existing S1/X2 connection of the DeNB is used for the S1/X2 connection of the proxy RN. The RN access is enough, and S1/X2 of the DeNB needs to be updated, such as: registering a new cell of the RN with a neighbor eNB or registering a Tracking Area Code (TAC) of the RN with an MME may be achieved through an existing eNB configuration update procedure. In fig. 2, a first dashed box is a UE attach procedure, establishing a basic IP connection; in the second dashed box is the node configuration process, the RN working as a network node.
Fig. 3 is a schematic diagram of a UE bearer establishment procedure in the conventional RN architecture. As shown in fig. 3, in the UE bearer establishment procedure in the RN architecture, an S1 message carrying a bearer establishment request directly reaches the DeNB. If the RN bearer needs to be updated (for example, in the GBR bearer case, when the UE GBR E-RAB multiplexed therein exceeds the RN tolerance, the RN GBR parameter needs to be increased to ensure more physical resources), the PGW function in the DeNB initiates a bearer update request to the MME of the RN, and the network side initiates bearer modification again. The RN may also initiate bearer update through a bearer resource request procedure.
Although the above RN start procedure and UE Bearer establishment procedure are given in the prior art, a scheme of how to establish a Data Radio Bearer (DRB) when the RN starts is not given.
Disclosure of Invention
The invention provides a DRB establishment method, which can realize the establishment of an initial DRB when an RN starts.
The invention also provides a DRB establishment system, which can realize the establishment of the initial DRB when the RN starts.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention discloses a method for establishing a Data Radio Bearer (DRB), which is applied to the DRB establishment of a Un interface when a Relay Node (RN) is started, and comprises the following steps:
the RN indicates DRB resource information which needs to be established initially to a Mobile Management Entity (MME) in an Evolved Packet Core (EPC) in the attachment process of the UE;
after receiving an indication representing DRB resource information needing to be connected initially, an MME sends bearer establishment configuration parameters to a donor node DeNB (DeNB) serving the RN;
and after receiving the bearer establishment configuration parameters, the DeNB completes establishment of an initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface.
The invention also discloses a DRB establishing system, which comprises: RN, DeNB and MME, wherein,
the RN is used for indicating DRB resource information which needs to be established initially to the MME in the attachment process of the UE;
the MME is used for sending a bearer establishment configuration parameter to a DeNB (evolved node B) providing service for the RN after receiving an indication which represents initial DRB resource information needing connection from the RN;
and the DeNB is used for completing the establishment of the initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface after receiving the bearer establishment configuration parameters.
As can be seen from the above, in the present invention, the RN indicates, to the MME in the EPC, the DRB resource that needs to be initially established in the UE attach process, after receiving the indication indicating the DRB resource that needs to be initially connected, the MME sends, to the DeNB that provides a service to the RN, the bearer establishment configuration parameter, and after receiving the bearer establishment configuration parameter, the DeNB completes, through the RRC reconfiguration process, establishment of the initial DRB of the Un interface at the Un interface, so that the DRB can be established when the RN is started.
Drawings
Fig. 1 is a schematic diagram of an RN in an existing LTE-a networking;
fig. 2 is a diagram illustrating a RN start-up procedure in a conventional RN architecture;
fig. 3 is a schematic diagram illustrating a UE bearer establishment procedure in a conventional RN architecture;
fig. 4 is a flowchart of a DRB establishment method according to an embodiment of the present invention;
fig. 5 is a diagram illustrating the establishment of DRBs when the RN starts according to the embodiment of the present invention;
fig. 6 is a diagram illustrating an embodiment of the present invention implementing DRB update through an E-RAB procedure;
fig. 7 is a diagram illustrating a DeNB directly performing a DRB update according to an embodiment of the present invention;
fig. 8 is a schematic composition diagram of a DRB establishment system according to an embodiment of the present invention.
Detailed Description
Fig. 4 is a flowchart of a DRB establishment method according to an embodiment of the present invention. The method is applied to the DRB establishment of the Un interface when the RN is started, and as shown in fig. 4, the method includes:
The DRB can be established in the RN starting process through the scheme.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
Fig. 5 is a schematic diagram of setting up a DRB when the RN starts up according to an embodiment of the present invention. As shown in fig. 5, the DRB establishment mechanism of the Un interface when the RN starts is as follows: based on pre-configuration, RN indicates DRB resources which need to be established initially to MME in EPC in UE attachment process (UE AttachProcedure) according to self capability and available Un interface resources. Here, since the EPC is agnostic to the radio resources, the DRB resource information that needs to be initially established may be a summary information, rather than explicit radio resource information, such as bearer capacity level Information Element (IE). The RN may indicate the DRB resource to be initially established through Access Stratum (AS) signaling or non-access stratum (NAS) signaling. After receiving an indication indicating that the DRB resource needs to be connected initially, an MME of the EPC sends a bearer establishment configuration parameter to a DeNB through a UE Context establishment (UE Context Setup) process in combination with the EPC resource state; or, after receiving the indication indicating the initial DRB resource to be connected, the MME of the EPC initiates an evolved radio access bearer E-RAB establishment procedure after the UE context establishment procedure, as shown by a dashed arrow in fig. 5, and sends the bearer establishment configuration parameters to the DeNB through the E-RAB establishment procedure. The bearer establishment parameter herein is a configuration parameter related to resource allocation when establishing a bearer. And after receiving the bearer establishment configuration parameters, the DeNB completes establishment of an initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface.
After a Data Radio Bearer (DRB) is established, how to change the DRB configuration as needed does not make explicit the message content in the existing scheme. Existing solutions also have to be tied to the EPC and redundancy exists.
For this, the present invention also provides a specific implementation manner of the DRB update procedure of the Un interface after the initial DRB establishment is completed through the procedure shown in fig. 5, which includes the following two alternatives:
the first scheme is as follows: DeNB triggering, realized through E-RAB management process
According to the existing scheme shown in fig. 3, the DeNB may initiate an update bearer request to the MME through the S1(RN) interface to implement DRB update of the Un interface, but there is no S1 procedure in the prior art that can indicate this information, and for this reason, the procedure shown in fig. 6 is given in the present invention to implement this indication.
Fig. 6 is a diagram illustrating an embodiment of the present invention implementing DRB update through an E-RAB procedure. As shown in fig. 6, an E-RAB modification Required (E-RAB modification Required) message is added in the E-RAB management process of the S1 interface. When the DeNB needs to update the DRB bearer, an E-RAB modification request (E-RAB modification Required) message is sent to the MME, and the message contains a bearer capacity level information element expected after the DRB modification. The value of the bearer capacity level cell corresponds to the DRB capacity of the corresponding RN on the Un interface. And the MME initiates an E-RAB modification process after receiving the E-RAB modification requirement message and modifies the E-RAB including the DRB of the Un interface through the E-RAB modification process. Here, the E-RAB modification procedure specifically includes: the MME sends an E-RAB modification request (E-RAB ModifyRequest) message to the DeNB, and the DeNB returns an E-RAB modification response (E-RAB ModifyResponse) message to the MME.
Scheme II: DeNB triggering, DeNB directly modifying DRB
Fig. 7 is a schematic diagram of a DeNB directly performing a DRB update according to an embodiment of the present invention. As shown in fig. 7, since the user plane data of the SGW/pgw (ue) directly arrives at the DeNB, and is mapped onto the Un interface DRB by the DeNB, the modification of the Un interface DRB does not need to communicate with the mme (RN), but directly modifies Un interface resources, such as the aforementioned GBR value, while keeping the configuration of the RN S1 interface bearer and the mapping relationship with the DRB unchanged. Namely, the DeNB does not send a message to the MME, and the DRB of the Un interface is changed directly through the RRC connection reconfiguration process of the Un interface.
In the embodiment of the present invention, the event triggering the DRB update process includes:
1) increase of occupied DRB resource
If the number of the UE accessed from the RN is increased, the DeNB or the RN detects that the occupancy rate of the DRB resource on the Un interface is higher than a preset first threshold value THhAnd maintained for a first preset time ThAnd triggering the DRB updating process of the Un interface.
2) Reduction of occupied DRB resources
When the DeNB or the RN detects that the occupancy rate of the DRB resource on the Un interface is lower than a preset second threshold value TH1And maintained for a second preset time T1And triggering the DRB updating process of the Un interface.
The strategy has the advantages that a certain margin of the Un resources can be kept, so that the UE can be accessed at any time, and the Un interface resources can be effectively utilized.
The following provides a composition of a DRB establishment system in the present invention based on the above-described embodiment.
Fig. 8 is a schematic composition diagram of a DRB establishment system according to an embodiment of the present invention. As shown in fig. 8, the system includes: RN, DeNB and MME, wherein,
the RN is used for indicating DRB resource information which needs to be established initially to the MME in the attachment process of the UE;
the MME is used for sending a bearer establishment configuration parameter to a DeNB (evolved node B) providing service for the RN after receiving an indication which represents initial DRB resource information needing connection from the RN;
and the DeNB is used for completing the establishment of the initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface after receiving the bearer establishment configuration parameters.
In the system shown in fig. 8, the RN is configured to indicate, through AS signaling or NAS signaling, DRB resource information that needs to be initially established.
In the system shown in fig. 8, the MME is configured to send a bearer establishment configuration parameter to the DeNB through a UE context establishment procedure; or, the MME is used for initiating an evolved radio access bearer (E-RAB) after the UE context establishment process and sending bearer establishment configuration parameters to the DeNB through the E-RAB process.
In the system shown in fig. 8, after the initial DRB establishment is completed, the DeNB is further configured to send an evolved radio access bearer E-RAB modification request message to the MME; the E-RAB modification request message comprises a bearer capacity level cell after DRB modification; the MME is further used for initiating an E-RAB modification process after receiving the E-RAB modification request message and modifying the E-RAB including the DRB of the Un interface through the E-RAB modification process; or, the DeNB directly changes the DRB of the Un interface through the RRC connection reconfiguration procedure of the Un interface without sending a message to the MME.
In the system shown in fig. 8, the DeNB or RN is configured to trigger a DRB update process of the Un interface when detecting that the occupancy rate of the DRB resource on the Un interface is higher than a preset first threshold and a first preset time is maintained; and/or the DeNB or the RN is configured to trigger a DRB update process of the Un interface when detecting that the occupancy rate of the DRB resource on the Un interface is lower than a preset second threshold and a second preset time is kept.
In summary, in the present invention, in the UE attach process, the RN indicates, to the MME in the EPC, the DRB resource that needs to be initially established, after receiving the indication indicating the DRB resource that needs to be initially connected, the MME sends, to the DeNB that provides service for the RN, the bearer establishment configuration parameter, and after receiving the bearer establishment configuration parameter, the DeNB completes, through the RRC reconfiguration process, establishment of the initial DRB of the Un interface at the Un interface, so that the DRB can be established when the RN is started. The invention also provides a DRB updating process and a mechanism for triggering the DRB updating process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A Data Radio Bearer (DRB) establishment method is applied to DRB establishment of a Un interface when a Relay Node (RN) is started, and is characterized by comprising the following steps:
the RN indicates DRB resource information which needs to be established initially to a Mobile Management Entity (MME) in an Evolved Packet Core (EPC) in the attachment process of the UE;
after receiving an indication representing DRB resource information needing to be connected initially, an MME sends bearer establishment configuration parameters to a donor node DeNB (DeNB) serving the RN;
and after receiving the bearer establishment configuration parameters, the DeNB completes establishment of an initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface.
2. The method of claim 1, wherein the indicating, by the RN, the DRB resource information to be initially established to the MME in the EPC during the UE attach procedure comprises:
and the RN indicates the DRB resource information which needs to be established initially through the AS signaling or the NAS signaling.
3. The method of claim 1, wherein sending, by an MME, bearer setup configuration parameters to a DeNB serving the RN comprises:
the MME sends the bearer establishment configuration parameters to the DeNB through the UE context establishment process;
or,
and the MME initiates an evolved radio access bearer E-RAB process after the UE context establishment process and sends bearer establishment configuration parameters to the DeNB through the E-RAB process.
4. The method of claim 1, 2 or 3, wherein after completing the initial DRB establishment, the method further comprises: DRB updating process of Un interface;
the DRB update procedure of the Un interface includes:
the DeNB sends an evolved radio access bearer E-RAB change request message to the MME; the E-RAB modification request message comprises a bearer capacity level cell after DRB modification; after receiving the E-RAB modification request message, the MME initiates an E-RAB modification process and modifies the E-RAB including the DRB of the Un interface through the E-RAB modification process;
or the DeNB does not send a message to the MME, and the DRB of the Un interface is changed directly through the RRC connection reconfiguration process of the Un interface.
5. The method of claim 4,
when the DeNB or the RN detects that the occupancy rate of DRB resources on a Un interface is higher than a preset first threshold and keeps a first preset time, triggering a DRB updating process of the Un interface;
and/or the presence of a gas in the gas,
and when the DeNB or the RN detects that the occupancy rate of the DRB resource on the Un interface is lower than a preset second threshold and keeps a second preset time, triggering the DRB updating process of the Un interface.
6. A DRB setup system, comprising: RN, DeNB and MME, wherein,
the RN is used for indicating DRB resource information which needs to be established initially to the MME in the attachment process of the UE;
the MME is used for sending a bearer establishment configuration parameter to a DeNB (evolved node B) providing service for the RN after receiving an indication which represents initial DRB resource information needing connection from the RN;
and the DeNB is used for completing the establishment of the initial DRB of the Un interface through a Radio Resource Control (RRC) reconfiguration process at the Un interface after receiving the bearer establishment configuration parameters.
7. The system of claim 6,
and the RN is used for indicating the DRB resource information which needs to be established initially through the AS signaling or the NAS signaling.
8. The system of claim 6,
the MME is used for sending the bearer establishment configuration parameters to the DeNB through the UE context establishment process;
or,
and the MME is used for initiating an evolved radio access bearer (E-RAB) after the UE context establishment process and sending bearer establishment configuration parameters to the DeNB through the E-RAB process.
9. The system of claim 6, 7 or 8, wherein after completing the initial DRB establishment,
the DeNB is further used for sending an evolved radio access bearer (E-RAB) change requirement message to the MME; the E-RAB modification request message comprises a bearer capacity level cell after DRB modification; the MME is further used for initiating an E-RAB modification process after receiving the E-RAB modification request message and modifying the E-RAB including the DRB of the Un interface through the E-RAB modification process;
or, the DeNB directly changes the DRB of the Un interface through the RRC connection reconfiguration procedure of the Un interface without sending a message to the MME.
10. The system of claim 9,
the DeNB or the RN is used for triggering a DRB updating process of the Un interface when detecting that the occupancy rate of DRB resources on the Un interface is higher than a preset first threshold and keeping a first preset time;
and/or the presence of a gas in the gas,
and the DeNB or the RN is used for triggering the DRB updating process of the Un interface when detecting that the occupancy rate of DRB resources on the Un interface is lower than a preset second threshold and second preset time is kept.
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| WO2012095013A1 (en) * | 2011-01-14 | 2012-07-19 | 大唐移动通信设备有限公司 | Method and device for implementing mbms service when relay node is deployed in network |
| CN102724718A (en) * | 2012-06-05 | 2012-10-10 | 大唐移动通信设备有限公司 | Method and device for notifying bearer information |
| WO2014000498A1 (en) * | 2012-06-29 | 2014-01-03 | 华为技术有限公司 | Data radio bearer establishment method and device |
| CN104584463A (en) * | 2012-07-26 | 2015-04-29 | Lg电子株式会社 | Method of supporting communication using two or more radio access technologies and apparatus for same |
| CN104704905A (en) * | 2012-10-18 | 2015-06-10 | 诺基亚通信公司 | Intelligent bearer setup configuration control |
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| WO2017020302A1 (en) * | 2015-08-06 | 2017-02-09 | 华为技术有限公司 | Method and apparatus for establishing data radio bearer |
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| CN102448121B (en) * | 2010-09-30 | 2014-10-29 | 普天信息技术研究院有限公司 | Method for releasing user bearer in wireless relay network |
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| CN104584463A (en) * | 2012-07-26 | 2015-04-29 | Lg电子株式会社 | Method of supporting communication using two or more radio access technologies and apparatus for same |
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| CN104584463B (en) * | 2012-07-26 | 2018-04-06 | Lg 电子株式会社 | The method and its device of communication are supported using two or more radio access technologies |
| CN104704905B (en) * | 2012-10-18 | 2018-11-06 | 诺基亚通信公司 | Configuration control is established in intelligence carrying |
| CN104704905A (en) * | 2012-10-18 | 2015-06-10 | 诺基亚通信公司 | Intelligent bearer setup configuration control |
| CN106211352A (en) * | 2015-05-04 | 2016-12-07 | 中兴通讯股份有限公司 | The method for building up of Data Radio Bearer and device |
| WO2017020302A1 (en) * | 2015-08-06 | 2017-02-09 | 华为技术有限公司 | Method and apparatus for establishing data radio bearer |
| CN108605372A (en) * | 2016-01-19 | 2018-09-28 | 夏普株式会社 | The communication means of terminal installation, MME, the communication means of terminal installation and MME |
| CN108605372B (en) * | 2016-01-19 | 2022-09-27 | 夏普株式会社 | Terminal device, MME, communication method for terminal device, and communication method for MME |
| CN107222934A (en) * | 2017-06-28 | 2017-09-29 | 京信通信系统（中国）有限公司 | Base station carrying establishing method and system |
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