CN102469439A - Method and system for indicating and acquiring X2 interface information - Google Patents
Method and system for indicating and acquiring X2 interface information Download PDFInfo
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Abstract
The invention discloses an indication and acquisition method and a system of X2 interface information.A relay node learns whether an X2 interface exists between a host base station and a non-host base station or not according to X2 interface indication information contained in an X2 interface signaling sent by the host base station. By adopting the invention, the host base station informs whether the relay node and other non-host base stations have X2 interfaces through X2 interface signaling, so that the relay node can acquire the information of the X2 interfaces between the host base station and other base stations and can apply the information to the switching decision process of user equipment or other X2 flows aiming at other base stations.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a method and a system for indicating and acquiring X2 interface information.
Background
To meet the increasing demand for high-speed mobile access with large bandwidth, the Third Generation Partnership project (3 GPP) has introduced the Long-Term Evolution Advanced (LTE-Advanced) standard. The LTE-Advanced is an Evolution of a Long-Term Evolution (LTE) system, which reserves the core of LTE, and extends a frequency domain and a space domain by using a series of technologies on the basis of the LTE-Advanced to achieve the purposes of improving the spectrum utilization rate, increasing the system capacity, and the like.
A radio Relay (Relay) technology is one of LTE-Advanced technologies, and aims to expand a coverage area of a cell, reduce dead-angle areas in communication, balance load, transfer services in hot spot areas, and save transmission power of a User Equipment (UE), that is, a terminal.
As shown in fig. 1, a new Relay Node (RN) is added between an existing base station (Donor-eNB) and a UE, and the added RN and the Donor-eNB are wirelessly connected. The radio link between the Donor-eNB and the RN is referred to as a backhaul link (which may be represented by a Un interface), and the radio link between the RN and the UE is referred to as an access link (which may be represented by a Uu interface). Downlink data firstly arrives at the Donor-eNB and then is transmitted to the RN, the RN transmits the downlink data to the UE, and the uplink data is not transmitted.
Currently, in order to configure resources of a backhaul link, a Relay-Node Physical Downlink Control CHannel (R-PDCCH for short), a Relay-Node Physical Downlink Shared CHannel (R-PDSCH for short) and a Relay-Node Physical Uplink Shared CHannel (R-PUSCH for short) are defined. The R-PDCCH channel Resource is all or part of a Physical Resource Block (PRB) in a subframe for backhaul downlink transmission. And the base station dynamically or semi-statically allocates R-PDSCH resources and R-PUSCH resources for the relay node by using the R-PDCCH, wherein the R-PDSCH resources are used for transmitting downlink data of a backhaul link, and the R-PUSCH resources are used for transmitting uplink data of the backhaul link.
After the relay node is introduced into the network, the relay node has a relay function of data transmission between the relay node and the base station and between the relay node and the UE administered by the relay node under the normal working state of the relay node. Specifically, between the base station and the RN, the relay function of the RN includes: the system comprises a system information acquisition function, a measurement and report function, a switching function, a function of data transmission through a control channel (R-PDCCH) and a shared channel (R-PDSCH or R-PUSCH), and the like. The RN may also govern a cell belonging to the RN, and govern user equipments in the cell. The relay function includes a function of transmitting system information of the RN, a measurement process of the UE, a handover process of the UE, and a function of transmitting data between the RN and the UE through a Physical Downlink Control Channel (PDCCH for short) and a Shared Channel (including a Physical Downlink Shared Channel (PDSCH for short) and a Physical Uplink Shared Channel (PUSCH for short)).
When the user equipment in the cell governed by the relay node needs to be handed over, the relay node (hereinafter also referred to as a source relay node) may select a suitable target cell for the user equipment to be handed over according to the measurement report of the user equipment. In the LTE system, there are two handover methods: one is a mode of switching through an X2 interface, in which a source relay node sends a Handover Request (Handover Request) to a target base station through an X2 interface; the other is a mode of performing Handover through an S1 interface, in which a source relay node sends a Handover request (Handover Required) to a core network through an S1 interface, and the core network sends a Handover signaling to a target base station. Compared with the S1 interface switching mode, the X2 interface switching has less influence on the core network, and the ue can be switched to the target cell faster, so if the X2 interface switching can be used, the source base station will preferably initiate the X2 interface switching.
However, according to the existing protocol, when a user equipment located in a cell under the jurisdiction of a source relay node needs to be handed over to a cell under the jurisdiction of an adjacent base station (a home base station to which a non-source relay node is accessed), the source relay node cannot determine whether an X2 interface exists between the home base station and the adjacent base station, and therefore the source relay node cannot determine whether an X2 interface handover process can be initiated to a target base station. Similarly, since the source relay node cannot determine whether the host base station has an X2 interface with the neighboring base station, the source relay node cannot determine whether other X2 interface signaling, such as Cell Activation Request/Response (Cell Activation state) signaling, Resource state Update (Resource state Request/Update) signaling, can be sent to the neighboring base station through the host base station.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a system for indicating and acquiring X2 interface information, which can enable a relay node to know whether an X2 interface exists between a host base station and a non-host base station.
In order to solve the above technical problem, the present invention provides a method for acquiring X2 interface information, in which a relay node learns whether an X2 interface exists between a host base station and a non-host base station according to X2 interface indication information contained in an X2 interface signaling sent by the host base station.
Further, the X2 interface indication information includes: the service cell information of the X2 interface signaling comprises configuration information of a cell governed by a non-host base station;
and the relay node learns that an X2 interface exists between the non-host base station and the host base station according to configuration information of a cell dominated by the non-host base station and contained in the service cell information.
Further, the X2 interface indication information includes: the configuration information of the cell managed by the non-host base station is contained in the adjacent cell information of the X2 interface signaling;
and the relay node learns that an X2 interface does not exist between the non-host base station and the host base station according to configuration information of a cell dominated by the non-host base station and contained in the adjacent cell information.
Further, the X2 interface indication information includes: the identifier of the non-host base station and/or the unique group identifier contained in the X2 interface signaling;
and the relay node learns that an X2 interface exists between the non-host base station and the host base station according to the identification of the non-host base station and/or the unique group identification contained in the X2 interface signaling.
Further, the X2 interface signaling includes an X2 setup request, an X2 setup response, and/or a configuration update message.
The invention also provides an indication method of the X2 interface information, wherein the host base station contains X2 interface indication information in the X2 interface signaling sent to the relay node, and indicates whether an X2 interface exists between the host base station and the non-host base station of the relay node.
Further, the method specifically comprises:
when the host base station receives the X2 establishment request sent by the relay node, returning an X2 establishment response to the relay node, wherein the returned service cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station with the X2 interface, and the neighboring cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station without the X2 interface.
Further, the method specifically comprises:
when the host base station sends an X2 establishment request to the relay node and requests to establish an X2 interface with the relay node, the sent service cell information of the X2 establishment request contains configuration information of a cell governed by a non-host base station with an X2 interface, and the neighbor cell information of the X2 establishment request contains configuration information of a cell governed by a non-host base station without an X2 interface.
Further, the X2 interface indication information includes: the identity and/or the unique group identity of the non-home base station with which the home base station has the X2 interface are/is contained in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
Further, the method further comprises:
after the host base station and the relay node establish an X2 interface, if an X2 interface between the host base station and a non-host base station changes, the host base station sends a configuration update message to the relay node, wherein the configuration update message contains changed X2 interface indication information.
Further, the host base station obtains the configuration information of the cell dominated by the non-host base station through the following method:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
The invention also provides a system for acquiring the X2 interface information, which is applied to the relay node and comprises the following components:
a signaling receiving device, configured to receive an X2 interface signaling sent by a host base station;
and the interface information acquisition device is used for acquiring whether an X2 interface exists between the host base station and the non-host base station according to X2 interface indication information contained in the X2 interface signaling.
Further, the interface information obtaining device is configured to obtain whether an X2 interface exists between the donor base station and the non-donor base station by:
acquiring that an X2 interface exists between the non-host base station and the host base station according to configuration information of a cell governed by the non-host base station, which is contained in service cell information of the X2 interface signaling;
acquiring that an X2 interface does not exist between a non-host base station and a host base station according to configuration information of a cell governed by the non-host base station, which is contained in neighbor cell information of an X2 interface signaling; and/or
Acquiring that an X2 interface exists between the non-host base station and the host base station according to the identification and/or the unique group identification of the non-host base station contained in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
The invention also provides an indication system of the X2 interface information, which is applied to the host base station, and the system comprises:
a signaling sending device, configured to send an X2 interface signaling to the relay node;
an interface information indicating device, configured to include, in the X2 interface signaling sent to the relay node, X2 interface indication information, and indicate whether an X2 interface exists between the donor base station and the non-donor base station of the relay node.
Further, the signaling sending device is configured to send an X2 establishment request to the relay node; or, according to the received X2 establishment request sent by the relay node, returning an X2 establishment response to the relay node;
the interface information indicating device is configured to include, in the sent X2 establishment request or the returned serving cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface exists, and/or include, in the X2 establishment request or the neighboring cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface does not exist.
Further, the interface information indicating device is configured to include, in the X2 interface signaling, an identifier of a non-donor base station with which an X2 interface exists, and/or a unique group identifier;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
Further, the signaling sending device is further configured to, after the X2 interface is established between the donor base station and the relay node, send a configuration update message to the relay node if an X2 interface between the donor base station and a non-donor base station changes;
the interface information indication means is further configured to include the changed X2 interface indication information in the configuration update message.
Further, the interface information indicating device is further configured to obtain configuration information of a cell governed by the non-host base station by the following method:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
By adopting the invention, the host base station informs whether the relay node and other non-host base stations have X2 interfaces through X2 interface signaling, so that the relay node can acquire the information of the X2 interfaces between the host base station and other base stations and can apply the information to the switching decision process of user equipment or other X2 flows aiming at other base stations. The invention has the advantages of small change to the existing protocol, simple realization and flexible configuration.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of a system architecture employing wireless relay technology in the prior art;
fig. 2 is a schematic flow chart of establishing an X2 interface between a base station and a relay node;
fig. 3 is a schematic diagram of a global cell identity and a base station identity.
Detailed Description
In order to solve the problem that the relay node in the prior art cannot acquire related information to reasonably process the switching of the user equipment and other X2 interface processes, the invention provides an acquisition method of X2 interface information, which specifically adopts the following technical scheme:
the relay node learns whether an X2 interface exists between a host base station and an adjacent base station of the relay node according to X2 interface indication information contained in an X2 interface signaling.
Wherein the X2 interface indication information includes: the service cell information of the X2 interface signaling comprises configuration information of a cell governed by a non-host base station;
and the relay node learns that an X2 interface exists between the non-host base station and the host base station of the relay node according to the configuration information of the cell dominated by the non-host base station contained in the service cell information.
In addition, the X2 interface indication information further includes: the configuration information of the cell managed by the non-host base station is contained in the adjacent cell information of the X2 interface signaling;
and the relay node learns that an X2 interface does not exist between the non-host base station and the host base station of the relay node according to the configuration information of the cell dominated by the non-host base station and contained in the adjacent cell information.
And the relay node learns that an X2 interface exists between the non-host base station and the host base station of the relay node according to the identification of the non-host base station and/or the unique group identification contained in the X2 interface signaling.
Further, the relay node learns whether an X2 interface exists between the other non-donor base station and the donor base station, and applies the X2 interface to the flows of handover type selection, cell update flow, resource state update and the like of the user equipment.
In addition, the invention also provides an indication method of the X2 interface information, which comprises the following steps: the host base station comprises X2 interface indication information in an X2 interface signaling sent to the relay node, and indicates whether an X2 interface exists between the host base station and the non-host base station of the relay node.
The method specifically comprises the following steps:
after the relay node is accessed to the host base station, an X2 establishment request is sent to the host base station, and an X2 interface is established between the relay node and the host base station;
and when receiving the X2 establishment request, the host base station returns an X2 establishment response, the service cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station with the X2 interface, and the adjacent cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station without the X2 interface.
Or, the method specifically comprises:
after the relay node is accessed to the host base station, the host base station sends an X2 establishment request to the relay node, and the request establishes an X2 interface with the relay node;
the host base station includes configuration information of a cell governed by a non-host base station having an X2 interface in the serving cell information of the X2 establishment request, and includes configuration information of a cell governed by a non-host base station having no X2 interface in the neighboring cell information of the X2 establishment request.
In addition, the donor base station can also include the identification of the non-donor base station with which the X2 interface exists and/or the unique group identification in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
Furthermore, the method further comprises:
after the relay node establishes an X2 interface with the donor base station, if an X2 interface between the donor base station and a non-donor base station changes, the donor base station sends a configuration update message to the relay node, and the configuration update message contains changed X2 interface indication information and informs the relay node of the changed X2 interface indication information.
Further, the host base station obtains the configuration information of the cell dominated by the non-host base station through the following method:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
For the convenience of describing the present invention, the following detailed description will be made with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example one
In the LTE-a system, it is assumed that a plurality of relay nodes, referred to as RN _1 and RN _2 … RN _ m, exist in a Cell (Cell 1) governed by a base station 1, and all of the relay nodes are in a normal operating state and can provide services for user equipment under the coverage of the relay nodes. Base stations 2 and 3 are also arranged around the base station 1, the base station 2 governs the cells 2 and 3, and the base station 3 governs the cells 4 and 5.
In this embodiment, after RN _1 accesses a Cell (Cell 1) managed by base station 1, an X2 interface is established with base station 1, and a specific process of acquiring information of the X2 interface includes:
in step 201, RN _1 sends an X2 Setup Request (X2 Setup Request) to bs 1, where the Request includes configuration information of a Cell (or called serving Cell) governed by RN _ 1.
The configuration Information includes an Identifier of a Cell under charge (including a Global identity (CGI) and a Physical identity (PCI)), a Tracking Area Code (TAC), a Public Land Mobile Network (PLMN), frequency, bandwidth, frame format Information (which is optional except for a frame format and is optional for a TDD mode), and the like, and is placed in a Served Cell Information.
It should be noted that, when the RN _1 performs registration (Attach) in the access network, the base station 1 establishes a Data Radio Bearer (DRB for short) for the RN _1, the RN _1 sends an X2 establishment request to the base station 1 through the established Data Radio Bearer, that is, a signaling packet of the X2 establishment request is sent to the base station 1 as a Data packet of the DRB, and the signaling of the X2 interface between the relay node and the base station to which the relay node is accessed is sent in this manner.
In step 202, after receiving the X2 establishment request, the base station 1 returns an X2 establishment Response (X2 Setup Response) to the RN _1, where the Response includes serving cell information and neighboring cell information.
In order to implement the present invention, the base station 1 needs to send Information on whether there is an X2 interface with an adjacent base station to the RN _1, and in order to reduce the influence on the protocol, the base station 1 places configuration Information of a Cell (Cell 1) governed by the base station 1 and Cell Information governed by a base station having an X2 interface with the base station in serving Cell Information (Served Cell Information) included in the X2 setup response; and placing cell Information without an X2 interface in the neighbor cell Information (neighbor Information) contained in the X2 establishment response.
In this embodiment, an X2 interface is established between the base station 2 and the base station 1, and an X2 interface is not established between the base station 3 and the base station 1 (the X2 interface can be determined to be established through an X2 interface establishment procedure between the base stations), so the base station 1 sets that the serving Cell information in the X2 establishment response includes configuration information of the Cell1, the Cell2, and the Cell3, where the configuration information includes an identifier, a tracking area code, a public land mobile network, a frequency, a bandwidth, frame format information, and the like of these cells; the neighbor Cell information in the setup response of X2 includes part of configuration information of Cell4 and Cell5, which refers to the identities and frequencies of these cells (this part of information is optional).
The base station 1 may acquire the configuration information of the cell managed by the base station 2 through an X2 interface (e.g., an X2 establishment request flow, a base station configuration update flow), may report part of the configuration information of the cell managed by the base station 3, such as the cell identifier and frequency, through a user equipment, and may also acquire the configuration information of the neighboring cell through a background server.
In step 203, RN _1 receives the X2 establishment response, and obtains Cell1, Cell2, and Cell3 in the serving Cell information, and obtains Cell4 and Cell5 in the neighbor Cell information.
The X2 setup response also includes information such as the identity of base station 1. In LTE, the identifier of a base station is the first 20 bits (or the leftmost 20 bits) of the global cell identifier of the cell governed by the base station, the global cell identifier is a total of 28 bits, the first 20 bits of the CGI of all the cells governed by the base station are the same, that is, the identifier of the base station, and the specific correspondence relationship is shown in fig. 3. Therefore, RN _1 determines that Cell1 is the Cell under the jurisdiction of base station 1 according to the identity of base station 1, and in fact, RN _1 accesses the network through Cell1, and at the time of initially accessing the network, RN _1 can know its CGI through the system message of Cell 1. Meanwhile, RN _1 finds that the two cells do not belong to base station 1, but belong to another base station by checking the first 20 bits of the CGIs of Cell2 and Cell3, and the identity of the base station, i.e., the first 20 bits of the CGIs of Cell2 and Cell3, is base station 2 here. Since Cell2 and Cell3 are placed in the serving Cell information, RN _1 can know that there is an X2 interface between base station 2 and base station 1.
Similarly, RN _1 finds that Cell4 and Cell5 belong to the same base station, here base station 3, by checking the first 20 bits of them, and since Cell4 and Cell5 are placed in the neighbor information, RN _1 can know that there is no X2 interface between base station 3 and base station 1.
After the RN _1 obtains the information whether there is an X2 interface between the base station 2, the base station 3 and the base station 1, it may apply it to the handover type selection of the user equipment it manages, and if the target base station for handover is the base station 2 and a Mobility Management Entity (MME) serving the user equipment also establishes an S1 interface with the base station 2, the RN _1 initiates an X2 handover for the user equipment. If the target base station for the handover is base station 3, RN _1 can only initiate S1 handover for the user equipment.
After the RN _1 obtains the information whether the X2 interface exists between the base station 2, the base station 3, and the base station 1, it may also be applied to other X2 interface flows, because the X2 interface exists between the base station 2 and the base station 1, the RN _1 may send a signaling of a cell activation request to the base station 2 through the base station 1, may send a signaling of a resource status request, a resource status update to the base station 2 through the base station 1, and may send a signaling of Load information (Load information) to the base station 2 through the base station 1 for interference control.
In this embodiment, in step 202, the base station 1 may carry configuration information of other relay node cells managed by the base station in the X2 establishment response, and may place the relay node cells in the serving cell information. Since the base station identifier of the relay node is the same as the base station identifier of its host base station, RN _1 can know which cells and/or relay nodes are administered by base station 1 through the CGI of the cell. Similarly, if the base station 2 also manages some relay nodes, assuming that the Cell6 is a relay node Cell managed by the base station 2, the base station 1 may include the configuration information of the Cell6 in the serving Cell information of the X2 establishment response. After the RN _1 obtains the information that the X2 interface exists between the base station (relay node in this case) to which the Cell6 belongs and the base station 1, it may apply it to the handover type selection of the ue it manages (if there is an X2 interface, it may be used in the existing X2 handover procedure) and other X2 procedures. If the base station 3 manages the relay node cell, because there is no X2 interface between the base station 3 and the base station 1, the relay node cell managed by the base station 3 needs to be placed in the neighbor cell information.
In this embodiment, RN _1 first sends an X2 establishment request to the base station 1, and in fact, it is also feasible that the base station 1 first sends an X2 establishment request to RN _1, and at this time, the serving cell information of the X2 establishment request includes the cell information of the neighboring base station having an X2 interface with the base station 1.
In this embodiment, the base station 1 sets a Cell governed by a base station having an X2 interface in serving Cell information, and does not include a Cell governed by a base station having an X2 interface (Cell 2 and Cell 3) in neighboring Cell information. In fact, this embodiment can be implemented in another way: the base station 1 sets cells (Cell 2 and Cell 3) under the control of the base station having an X2 interface in serving Cell information, and includes not only Cell4 and Cell5 without an X2 interface but also partial configuration information of Cell2 and Cell3 in neighboring Cell information. The purpose of this is to maintain the integrity of the neighboring cell information, and meanwhile, to set cell information governed by other base stations in the serving cell information for transferring other base station information with an X2 interface. When the relay node receives the response signaling established by the X2, all the neighboring cell information is obtained, and meanwhile, according to the relationship between the CGI and the base station identifier, which base stations and the host base station have an X2 interface between them are obtained from the serving cell information.
Example two
In the LTE-a system, a relay node exists in a Cell (Cell 1) under the jurisdiction of the base station 1, and is RN _1, and the relay node is in a normal working state and can provide service for user equipment under the coverage of the relay node. Base stations 2 and 3 are also located around base station 1 (the host base station of RN _ 1), with base station 2 dominating cells 2 and 3 and base station 3 dominating cells 4 and 5.
There is an X2 interface between base station 1 and base station 2, and there is no X2 interface between base station 1 and base station 3. The RN _1 learns the X2 interface information between the base station 1 and the base stations 2 and 3 in the process of establishing the X2 interface with the base station 1, and the base station 1 places the Cell2 and the Cell3 in the serving Cell information and places the Cell4 and the Cell5 in the neighbor Cell information in the X2 establishment response.
Then, when an X2 interface is established between the base station 1 and the base station 3, the base station 1 needs to send an update message to the RN _1, and the specific process is as follows:
in step 301, the base station 1 transmits a base station Configuration Update (ENB Configuration Update) signaling to the RN _1, and the serving Cell information in the signaling includes Configuration information of the Cell2, the Cell3, the Cell4, and the Cell 5. The neighbor Cell information in the signaling may include information of other neighbor cells, but does not include information of Cell4 and Cell 5.
In step 302, RN _1 finds that the serving Cell information includes the configuration information of Cell4 and Cell5 after receiving the base station configuration update, finds that they belong to the same base station, here, base station 3, by checking the first 20 bits of Cell4 and Cell5, and since Cell4 and Cell5 are placed in the serving Cell information, RN _1 can know that there is an X2 interface between base station 3 and base station 1. After acquiring the information that the X2 interface exists between the base station 3 and the base station 1, the RN _1 may apply the information to the selection of the handover type of the ue managed by the RN _ 1; it can also be applied to other X2 interface flows. RN _1 transmits a base station Configuration Update acknowledgement (ENB Configuration Update acknowledgement) signaling to base station 1.
EXAMPLE III
In the LTE-a system, a relay node exists in a Cell (Cell 1) under the jurisdiction of the base station 1, and is RN _1, and the relay node is in a normal working state and can provide service for user equipment under the coverage of the relay node. Meanwhile, the base station 1 has another Cell2, the base station 2 and the base station 3 are arranged around the base station 1 (the host base station of the RN _ 1), the base station 2 governs the Cell3 and the Cell4, and the base station 3 governs the Cell5 and the Cell 6. An X2 interface is established between the base station 2 and the base station 1, and an X2 interface is not established between the base station 3 and the base station 1.
The procedure for establishing the X2 interface between the relay node and the base station 1 is as follows:
step 401, RN _1 sends an X2 establishment request to base station 1, where the request includes configuration information of the cell governed by RN _1, such as cell identifier (including CGI and PCI), tracking area code, PLMN, frequency, bandwidth, and frame format information.
In step 402, after receiving the request, the base station 1 returns an X2 establishment response to the RN _1, where the response includes configuration information of Cell1 and Cell2, and the two cells are placed in the serving Cell information. The neighboring configuration of the response includes part of configuration information of Cell3, Cell4, Cell5, and Cell 6. In order to implement the invention, the response contains the identity of the base station with which base station 1 has an X2 interface. The base station 1 therefore contains in this response, in addition to the identity of the base station 1 (prior art), the identity of the base station 2, there being a separate cell which represents the base station identity of the base station 2.
In step 403, after receiving the X2 establishment response, RN _1 learns the information of the cells under the jurisdiction of base station 1, base station 2, and base station 3, and learns that there is an X2 interface between base station 2 and base station 1 through the identifier of base station 2 included in the X2 establishment response. Since the X2 setup response does not include the bs id of bs 3, RN _1 knows that there is no X2 interface between bs 3 and bs 1. After acquiring the information that the X2 interface exists between the base station 2 and the base station 1, the RN _1 may apply the information to the selection of the handover type of the ue managed by the RN _ 1; it can also be applied to other X2 interface flows.
If the base station 3 establishes an X2 interface with the base station 1, the base station 1 may notify the change of the RN _1 interface information through a base station configuration update signaling, where the base station identity carrying the base station 3 is used to indicate that an X2 interface exists between the base station 3 and the base station 1.
In this embodiment, the base station 1 sets the base station identifier of the neighboring base station in the X2 setup response and the base station configuration update, to indicate that an X2 interface exists between the neighboring base station and the base station. The base station 1 may also indicate whether an X2 interface exists between the neighboring base station and the base station by setting other cells, for example, the base station 1 sets a GU Group Id (unique Group Id) of the neighboring base station in an X2 setup response, a base station configuration update, and an X2 setup request, which indicates that an X2 interface exists between the neighboring base station and the base station, at this time, an identifier of the neighboring base station and the GU Group Id connected to the neighboring base station may be added, or the GU Group Id and an identifier of a cell may be associated (i.e., the GU Group Id is added to cell information), and after receiving the GU Group Id corresponding to a certain base station (or a cell governed by the base station), the relay node determines that an X2 interface exists between the base station and the host base station; or,
the base station 1 sets information such as tracking area code, bandwidth, or physical random access channel configuration of the neighboring base station in the X2 setup response, base station configuration update, and X2 setup request, which indicates that an X2 interface exists between the neighboring base station and the base station, that is, if the base station 1 sets tracking area code, bandwidth, or physical random access channel configuration of a cell governed by a certain base station, it indicates that an X2 interface exists between the base station and the host base station, and the relay node can determine whether an X2 interface exists between the base station and the host base station after obtaining corresponding information.
In addition, an embodiment of the present invention further provides a system for acquiring X2 interface information, which is applied to a relay node, and the system mainly includes:
a signaling receiving device, configured to receive an X2 interface signaling sent by a host base station;
and the interface information acquisition device is used for acquiring whether an X2 interface exists between the host base station and the non-host base station according to X2 interface indication information contained in the X2 interface signaling.
Further, the interface information obtaining device is configured to obtain whether an X2 interface exists between the donor base station and the non-donor base station by:
acquiring that an X2 interface exists between the non-host base station and the host base station according to configuration information of a cell governed by the non-host base station, which is contained in service cell information of the X2 interface signaling;
acquiring that an X2 interface does not exist between a non-host base station and a host base station according to configuration information of a cell governed by the non-host base station, which is contained in neighbor cell information of an X2 interface signaling; and/or
Acquiring that an X2 interface exists between the non-host base station and the host base station according to the identification and/or the unique group identification of the non-host base station contained in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
In addition, an embodiment of the present invention further provides an indication system of X2 interface information, which is applied to a host base station, and the system includes:
a signaling sending device, configured to send an X2 interface signaling to the relay node;
an interface information indicating device, configured to include, in the X2 interface signaling sent to the relay node, X2 interface indication information, and indicate whether an X2 interface exists between the donor base station and the non-donor base station of the relay node.
Further, the signaling sending device is configured to send an X2 establishment request to the relay node; or, according to the received X2 establishment request sent by the relay node, returning an X2 establishment response to the relay node;
the interface information indicating device is configured to include, in the sent X2 establishment request or the returned serving cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface exists, and/or include, in the X2 establishment request or the neighboring cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface does not exist.
Further, the interface information indicating device is configured to include, in the X2 interface signaling, an identifier of a non-donor base station with which an X2 interface exists, and/or a unique group identifier;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
Further, the signaling sending device is further configured to, after the X2 interface is established between the donor base station and the relay node, send a configuration update message to the relay node if an X2 interface between the donor base station and a non-donor base station changes;
the interface information indication means is further configured to include the changed X2 interface indication information in the configuration update message.
Further, the interface information indicating device is further configured to obtain configuration information of a cell governed by the non-host base station by the following method:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Claims (18)
1. A method for acquiring X2 interface information is characterized in that,
the relay node learns whether an X2 interface exists between the host base station and the non-host base station according to X2 interface indication information contained in an X2 interface signaling sent by the host base station.
2. The method of claim 1,
the X2 interface indication information comprises: the service cell information of the X2 interface signaling comprises configuration information of a cell governed by a non-host base station;
and the relay node learns that an X2 interface exists between the non-host base station and the host base station according to configuration information of a cell dominated by the non-host base station and contained in the service cell information.
3. The method of claim 1,
the X2 interface indication information comprises: the configuration information of the cell managed by the non-host base station is contained in the adjacent cell information of the X2 interface signaling;
and the relay node learns that an X2 interface does not exist between the non-host base station and the host base station according to configuration information of a cell dominated by the non-host base station and contained in the adjacent cell information.
4. The method of claim 1,
the X2 interface indication information comprises: the identifier of the non-host base station and/or the unique group identifier contained in the X2 interface signaling;
and the relay node learns that an X2 interface exists between the non-host base station and the host base station according to the identification of the non-host base station and/or the unique group identification contained in the X2 interface signaling.
5. The method of claim 1, 2, 3 or 4,
the X2 interface signaling includes an X2 setup request, an X2 setup response, and/or a configuration update message.
6. A method for indicating X2 interface information is characterized in that,
the host base station comprises X2 interface indication information in an X2 interface signaling sent to the relay node, and indicates whether an X2 interface exists between the host base station and the non-host base station of the relay node.
7. The method according to claim 6, characterized in that the method comprises in particular:
when the host base station receives the X2 establishment request sent by the relay node, returning an X2 establishment response to the relay node, wherein the returned service cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station with the X2 interface, and the neighboring cell information of the X2 establishment response contains the configuration information of the cell governed by the non-host base station without the X2 interface.
8. The method according to claim 6, characterized in that the method comprises in particular:
when the host base station sends an X2 establishment request to the relay node and requests to establish an X2 interface with the relay node, the sent service cell information of the X2 establishment request contains configuration information of a cell governed by a non-host base station with an X2 interface, and the neighbor cell information of the X2 establishment request contains configuration information of a cell governed by a non-host base station without an X2 interface.
9. The method of claim 6,
the X2 interface indication information comprises: the identity and/or the unique group identity of the non-home base station with which the home base station has the X2 interface are/is contained in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
10. The method of claim 6, 7, 8 or 9, further comprising:
after the host base station and the relay node establish an X2 interface, if an X2 interface between the host base station and a non-host base station changes, the host base station sends a configuration update message to the relay node, wherein the configuration update message contains changed X2 interface indication information.
11. The method of claim 6, 7 or 8,
the host base station obtains the configuration information of the cell under the jurisdiction of the non-host base station through the following modes:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
12. An acquisition system of X2 interface information, applied to a relay node, the system comprising:
a signaling receiving device, configured to receive an X2 interface signaling sent by a host base station;
and the interface information acquisition device is used for acquiring whether an X2 interface exists between the host base station and the non-host base station according to X2 interface indication information contained in the X2 interface signaling.
13. The system of claim 12, wherein the interface information obtaining means is configured to obtain whether an X2 interface exists between the donor base station and the non-donor base station by:
acquiring that an X2 interface exists between the non-host base station and the host base station according to configuration information of a cell governed by the non-host base station, which is contained in service cell information of the X2 interface signaling;
acquiring that an X2 interface does not exist between a non-host base station and a host base station according to configuration information of a cell governed by the non-host base station, which is contained in neighbor cell information of an X2 interface signaling; and/or
Acquiring that an X2 interface exists between the non-host base station and the host base station according to the identification and/or the unique group identification of the non-host base station contained in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
14. An indication system of X2 interface information, applied to a host base station, the system comprising:
a signaling sending device, configured to send an X2 interface signaling to the relay node;
an interface information indicating device, configured to include, in the X2 interface signaling sent to the relay node, X2 interface indication information, and indicate whether an X2 interface exists between the donor base station and the non-donor base station of the relay node.
15. The system of claim 14,
the signaling sending device is used for sending an X2 establishment request to the relay node; or, according to the received X2 establishment request sent by the relay node, returning an X2 establishment response to the relay node;
the interface information indicating device is configured to include, in the sent X2 establishment request or the returned serving cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface exists, and/or include, in the X2 establishment request or the neighboring cell information of the X2 establishment response, configuration information of a cell governed by a non-donor base station in which an X2 interface does not exist.
16. The system of claim 14 or 15,
the interface information indicating device is used for containing the identification of the non-host base station with which the X2 interface exists and/or the unique group identification in the X2 interface signaling;
wherein the X2 interface signaling comprises an X2 establishment request, an X2 establishment response and/or a configuration update message.
17. The system of claim 16,
the signaling sending device is further configured to send a configuration update message to the relay node if an X2 interface between the donor base station and the non-donor base station changes after the donor base station establishes an X2 interface with the relay node;
the interface information indication means is further configured to include the changed X2 interface indication information in the configuration update message.
18. The system of claim 14 or 15,
the interface information indicating device is further used for obtaining the configuration information of the cell dominated by the non-host base station in the following mode:
acquiring configuration information of a cell managed by a non-host base station through an X2 interface; or,
reporting and obtaining part of configuration information of a cell managed by a non-host base station through user equipment; or,
and obtaining the configuration information of the cell in the jurisdiction of the non-host base station through a background server.
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