CN101932120A - Method and device for establishing connection between relay node and network node - Google Patents

Abstract

The present invention relates to a method and device for establishing a connection between a relay node and a network node. The method includes: sending a connection establishment request message to a selected network node to be connected, and the connection establishment request message includes: its own node type and /or connection type; receiving a connection establishment response message sent by the network node to be connected. Adopting the technical scheme of the present invention, not only can the relay node automatically establish a connection with the home base station, establish a wireless X2 interface, and directly perform information interaction with other network nodes, reducing the time delay of information interaction, but also enables the network to have self-configuration, self-configuration The ability to optimize improves network performance.

Description

Method and device for establishing connection between relay node and network node

technical field

The invention relates to mobile communication technology, in particular to a method and device for establishing a connection between a relay node and a network node.

Background technique

In order to solve the coverage problem of the base station, it is usually necessary to use a relay node (RN, Relay Node) to enhance the wireless communication signal between the base station (eNB) and the mobile station (MS, Mobile Station). The relay node communicates with the base station through a wireless link. A base station serving a relay node is called a home base station. One or more relay nodes can be deployed under a base station. Information exchanged between the relay node and other network nodes needs to be forwarded through its home base station (Donor-eNB).

In the existing technology, the operator determines the home base station for the deployed relay node, so that the relay node can successfully connect to its home base station, and meet the specific needs of a certain home base station, such as: expanding coverage, or increasing the cell edge Throughput, etc.; and due to the use of physical directional antennas, the link quality between the home base station and the relay node can be relatively good. However, in some scenarios, such as a relay node in an emergency or a newly powered relay node or a mobile relay node, it may not be possible to configure its home base station with a physically directional antenna. In view of the existing technology, the inventors of the present invention found that the adjacent network nodes may be ordinary eNB, relay node, H(e)NB, Pico eNB and other different types of nodes. And different node types, and/or different operator strategies, and/or different network conditions may lead to different home base station selection strategies, that is to say, some base stations can be used as home base stations of relay nodes, and some base station It cannot be used as the home base station of the relay node. Therefore, the prior art currently does not have a mechanism to prevent the relay node from wrongly selecting the home base station.

In the process of implementing the present invention, the inventor found the following problems in the prior art: the relay node may configure the wrong home base station, and the home base station cannot judge whether the UE or the relay node is requesting to connect, so that the home base station may be wrongly configured. The relay node is configured as a UE, and the relay node performs information exchange with other adjacent relay nodes or adjacent base stations of the home base station, resulting in a long delay.

Contents of the invention

Embodiments of the present invention provide a method and device for establishing a connection between a relay node and a network node, so as to prevent the relay node from selecting a wrong home base station, and the home base station can determine whether the request for connection is a UE or a relay node, thereby improving the reliability of the relay node. The efficiency of establishing a connection with the home base station, and reducing the time delay during information exchange between the relay node and the network node.

In order to solve the above technical problems, the present invention provides a method for establishing a connection between a relay node and a network node, the method comprising:

Send a connection establishment request message to the selected network node to be connected, where the connection establishment request message includes: its own node type and/or connection type;

Receive a connection establishment response message sent by the network node to be connected.

The embodiment of the present invention also provides a method for establishing a connection between a relay node and a network node, the method comprising:

The network node receives a connection establishment request message sent by a node accessing the network, where the connection establishment request message includes: the node type of the node and/or the connection type;

The network node judges whether the node is a relay node according to the node type and/or connection type of the node; if so, sends a connection establishment response message to the node.

Correspondingly, an embodiment of the present invention also provides an apparatus for establishing a connection between a relay node and a network node, wherein the apparatus includes:

An establishment request sending unit, configured to send a connection establishment request message to the selected network node to be connected, where the connection establishment request message includes: the node type and/or connection type of itself;

The establishment response receiving unit is configured to receive the connection establishment response message sent by the network node to be connected.

Correspondingly, an embodiment of the present invention also provides an apparatus for establishing a connection between a relay node and a network node, the apparatus including:

An establishment request receiving unit, configured to receive a connection establishment request message sent by a node accessing the network, where the connection establishment request message includes: the type of connection and/or the node type of the node;

A determining unit, configured to determine whether the node is a relay node according to the connection type and/or the node type of the node, and if so, send a notification that the node is a relay node;

The establishment response sending unit is configured to send a connection establishment response message to the node when receiving the notification sent by the determining unit that the node is a relay node.

It can be seen from the above implementation scheme that in the embodiment of the present invention, the relay node that newly accesses the network sends a connection establishment request message to the selected network node to be connected, and the connection establishment request message may include: the node type of its own node and /or the type of connection, and the connection establishment response message sent by the network node to be connected is received. That is to say, because the relay nodes newly connected to the network can establish connections with network nodes in the running network and/or establish wireless X2 interface connections according to their own needs, operator policies and network conditions, thereby reducing the number of new access nodes. The time delay when the relay nodes of the network interact with the network nodes in the network not only improves the self-configuration and self-optimization capabilities of the relay nodes newly connected to the network, but also improves the performance of the network.

Description of drawings

FIG. 1 is a flowchart of a method for establishing a connection between a relay node and a network node provided in an embodiment of the present invention;

FIG. 2 is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 2 of the present invention;

FIG. 3 is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 3 of the present invention;

FIG. 4 is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 4 of the present invention;

FIG. 5 is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 5 of the present invention;

FIG. 6 is a flow chart of allocating wireless resources between relay nodes provided in an embodiment of the present invention;

FIG. 7 is a flowchart of a method for establishing a connection between a relay node and a network node provided in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an apparatus for establishing a connection between a relay node and a network node provided in an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of an apparatus for establishing a connection between a relay node and a network node provided in an embodiment of the present invention.

Detailed ways

Below we will describe the embodiments of the present invention in detail with reference to the accompanying drawings.

Please refer to FIG. 1, which is a flowchart of a method for establishing a connection between a relay node and a network node provided in an embodiment of the present invention, the method including:

Step 101: Send a connection establishment request message to the selected network node to be connected, where the connection establishment request message includes: its own node type and/or connection type;

Wherein, the connection establishment request message may further include at least one of the following parameters: Universal Mobile Subscriber Identity Code, maximum transmit power, location, and wireless single frequency network backhaul configuration for multimedia broadcast multicast services; but not limited thereto , may be other, which is not limited in this embodiment.

Step 102: Receive a connection establishment response message sent by the network node to be connected.

Wherein, when the connection establishment result is successful, the connection establishment response message may also include the cell-wireless network temporary identifier and wireless uplink resources allocated for the relay node; when the connection establishment result is successful, and when the to-be-connected When the network node is the home base station, the connection establishment response message may also include: configuration parameters of the wireless backhaul link, and a cell-radio network temporary identifier (C-RNTI, cell-Radio Network Temporary Identifier) allocated for the relay node and wireless uplink resources; wherein, the configuration parameters of the wireless backhaul link include: physical cell identity, tracking area code, Internet protocol, and shared public land mobile network list, but are not limited thereto, and may be other resources, this embodiment No limit.

Before step 101, the method may further include:

When the node type of the adjacent network node has been known, then according to the type of the network node to be connected and the node type of the adjacent network node, select an adjacent network node that matches the type of the network node to be connected The network node serves as the network node to be connected;

When the node type of the adjacent network node is not known, select one of the adjacent network nodes as the network node to be connected according to the network node to be connected, and its own situation and/or network situation.

That is to say, the node newly connected to the network judges whether the node type of the adjacent network node has been known, and if so, selects a node to be connected according to the node type of the adjacent network node or according to the type of the network node to be connected. network node; otherwise, select a network node as the network node to be connected according to its own situation and/or network situation.

For example: when the node type of the adjacent network node learned by the relay node that needs to establish a connection does not match the type of the network node to be connected, or when the node type of the adjacent network node is not known at all, the relay node according to For the type of network node to be connected, a network node is randomly selected from the network nodes whose node type is not known as the network node to be connected.

Among them, when the node type of the adjacent network node is not known:

When the network node to be connected is a relay node or a neighboring base station of the home base station, the connection establishment request message further includes: the home base station identifier.

When the node type of the adjacent network node is not known, selecting one of the adjacent network nodes as the network node to be connected according to its own situation and/or network situation to be connected specifically includes:

When the network node to be connected selected according to its own situation and/or network situation is the home base station, and the network node to be connected is the home base station, the connection establishment response message includes: the node type of the home base station, and /or the type of the connection is to establish a connection with the home base station;

When the network node to be connected selected according to its own situation and/or network situation is a relay node, and the network node to be connected is a relay node, the connection establishment response message includes: the relay node the type of node, and/or the type of the connection is to establish a wireless X2 interface;

When the type of network node to be connected selected according to its own situation and/or network situation is a neighboring base station of the home base station, and the network node to be connected is a neighboring base station of the home base station, the connection establishment response message Including: the node type of the neighboring base station of the home base station, and/or the type of the connection is to establish a wireless X2 interface.

When the node types of neighboring network nodes are known:

When the network node to be connected is the home base station, in the connection establishment request message: the type of connection is to establish a connection between the relay node and the home base station;

When the network node to be connected is a relay node, in the connection establishment request message: the type of connection is that the relay node establishes an X2 interface with another relay node, and the connection establishment request message also includes a home base station identifier;

When the network node that needs to be connected is a neighboring base station of the home base station, in the connection establishment request message: the type of connection is to establish an X2 interface between the relay node and the neighboring base station of the home base station, and the connection establishment request message also includes ID of the home base station.

The connection establishment response message includes: the result of the connection establishment is success or failure, and if the connection establishment result is failure, the connection establishment response message further includes the reason for the failure.

The home base station is specifically: a home base station in a two-hop relay system; or, a home base station in a multi-hop relay system; or, a relay node serving as a home base station in a multi-hop relay system.

Before step 101, the method may further include:

When the node type of the adjacent network node and the interface type supported by the adjacent network node have been known, then select one that is compatible with the described adjacent network node according to the type of network node to be connected and the node type of the adjacent network node. The adjacent network node whose type matches the network node to be connected and whose supported interface type matches the connection type to be established serves as the network node to be connected.

For example, when the node type of the adjacent network node and the interface type supported by the adjacent network node are known, if the type of the network node to be connected matches the learned node type of the adjacent network node, then when When the interface type supported by the adjacent network node matches the type of connection to be established, select the adjacent network node as the network node to be connected; otherwise, the adjacent network node cannot be used as the network node to be connected , need to reselect.

It should be noted that the home base station in this embodiment may be: a home base station in a two-hop relay system; it may also be a home base station in a multi-hop relay system, or a relay node serving as a home base station. The process of establishing a connection with the home base station in the multi-hop relay system is similar to the process of establishing a connection with the home base station in the two-hop relay system. For details, refer to the above and will not repeat them here.

Optionally, after step 102, for the access of the relay node, regardless of establishing a connection with the home base station or establishing a wireless X2 interface, it is necessary to configure a backhaul link according to the configuration parameters of the backhaul link.

Wherein, in the above-mentioned embodiment, the learning of the node type or the supported interface type of the neighboring network node may specifically know the neighboring network from the synchronization channel, and/or broadcast channel, and/or system message of the network node. The node type of the node or the interface type supported by the adjacent network node.

Preferably, the method may further include: pre-adding or defining information bits in the synchronization channel, broadcast channel and/or system message of the adjacent network node, and the information bits are used to indicate the node type of the network node It is a base station or a relay node or a supported interface type; wherein, the relay node includes: a type 1 relay node and/or a type 2 relay node; and/or a layer 1 relay node, a layer 2 relay node and/or a layer 3 relay node; the interface includes: Un interface, S1 interface and/or X2 interface, but is not limited thereto.

That is to say, in the embodiment of the present invention, first, add or define the node types of network nodes, mainly including, but not limited to:

1) Relay nodes, which can be further subdivided into different types of relay nodes, such as type 1 relay nodes, type 2 relay nodes..., or layer 1, layer 2, layer 3 relay nodes etc., because different types of relays represent different capabilities and requirements;

2) Ordinary base station;

3) Other types;

Or, add or define whether the network node supports relay node access, or clearly indicate the type of interface that supports access, such as supporting Un interface, and/or Uu interface, and/or S1 interface, and/or X2 interface, etc., But it is not limited to this.

Secondly, define the type of connection requested, which can be indicated by a connection establishment request message, or in RACH signaling or dedicated radio resource control (RRC, Radio Resource Control) signaling;

The node type included in the connection establishment request message can be UE, relay node (relay node can be further subdivided into type 1 relay node, type 2 relay node..., or layer 1, layer 2, layer 3 relay nodes, etc.);

The types of connections mainly include, but are not limited to:

1) The UE establishes a connection with the home base station

2) The relay node establishes a connection with the home base station;

3) The relay node establishes a wireless X2 interface with another relay node in the network; wherein, the wireless X2 interface is an interface between relay nodes defined by the embodiment of the present invention;

4) The relay node establishes a wireless X2 interface with the adjacent base station of the home base station; wherein, the wireless X2 interface is an interface between relay nodes defined by the embodiment of the present invention;

5) Other types.

That is to say, when the network node receives a connection establishment request, and only includes the connection type being a relay node to establish a connection with the home base station, the network node can know that the node type that sends the request is a relay node, and the connection that needs to be established It is a connection with the home base station, so that the network node can distinguish that the requesting node is a relay rather than a UE, and send a connection establishment response message to the relay node according to the processing for the relay node.

In order to facilitate the understanding of those skilled in the art, specific examples are used below to illustrate.

The inventors of the present invention found that in the existing technology, the adjacent network nodes may be ordinary eNBs, relay nodes, H(e)NBs, Pico eNBs and other different types of nodes. And different node types, and/or different operator strategies, and/or different network conditions may lead to different home base station selection strategies, that is to say, some base stations can be used as home base stations of relay nodes, and some The base station cannot be the home base station of the relay node. That is, the prior art currently does not have a mechanism to prevent the relay node from wrongly selecting the home base station. For this reason, the embodiment of the present invention provides embodiment one:

Embodiment one

In the embodiment of the present invention, information bits can be added or defined in the message of the synchronization channel (SCH, Synchronization Channel)/broadcast channel (BCH, Broadcast Channel) of the base station and/or the relay node, or can be included in the information block of the system message Add or define information bits in (SIB1, System Information Block), the information bits are used to indicate the node type, as shown in Table 1, the base station can use the node type information of the node to indicate that it is a base station, an already running relay node The node type information may also be used to indicate that it is a relay node, or indicate whether to support relay node access.

After adding this information bit, the relay node that needs to access the network can request the common base station to establish a connection with the home base station, or request the relay node to establish a wireless X2 interface, or request the adjacent base station of the home base station to establish a wireless X2 interface wait.

Table 1

Wherein, the base station and/or the running relay node can broadcast their respective node types, and the way of broadcasting can be periodic triggering or event triggering, and the triggering event can be, for example, through the base station and/or the running relay node The automatic neighbor relation (ANR, Automatic Neighbor Relation) function of the node discovers the network node.

The inventors of the present invention found that in the prior art, in order for the relay node to connect to its home base station, the relay node first needs to act as a UE and establish a connection with the home base station, such as establishing a connection with the home base station through a radio resource control connection establishment request. connect. However, in the process of establishing a connection, when the home base station receives the connection establishment request sent by the relay node, it may regard the relay node as a UE, and then process it according to the logic of the UE. corresponding configuration. In this case, in the prior art, the default service objects of the base station are all UEs. Therefore, the current prior art cannot realize the access of the relay node. For this reason, the embodiment of the present invention provides following embodiment:

Embodiment two

Please refer to FIG. 2 , which is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 2 of the present invention. In this embodiment, the relay node takes a newly powered relay node as an example. , but not limited thereto, the relay node can initiate a connection establishment request with the home base station to the selected base station according to the obtained node type of the adjacent network node, and the specific process includes:

Step 201: Obtain the node type (such as eNB type) of the adjacent network node;

For example, the relay node 2 acquires the node type of the adjacent network node, and selects a home base station (such as the base station in the figure) to be connected according to the node type of the adjacent network node; wherein, the acquisition method may be By receiving the node type of the adjacent network node sent by the adjacent network node through the system message, it can also be used in other ways, which is not limited in this example;

Step 202: The relay node 2 sends a connection establishment request to the selected home base station to be connected, and the connection establishment request includes: the node type of the relay node 2 is a relay node, and/or the connection establishment type is "with Home base station establishes a connection", but is not limited thereto, and may also include other parameters, which are not limited in this embodiment;

Step 203: The home base station to be connected feeds back a response message to the relay node. The response message may be an acceptance message (this embodiment takes acceptance as an example), or a rejection message, and may also include the reason for the rejection; that is That is, if the home base station to be connected can establish a connection between the relay node and the home base station, an acceptance message is sent to the relay node; otherwise, a rejection message is sent to the relay node.

Step 204: After receiving the acceptance response message, the relay node 2 sends a configuration report to the home base station to be connected, and carries its own specific information, such as at least one of the following: Universal Subscriber Identity Module Information (USIM info , universal subscriber identity module), International Mobile Subscriber Identity (such as IMSI, International Mobile Subscriber Identity); maximum transmit power (Max Tx Power); location (location); multimedia broadcast multicast service single frequency network backhaul configuration (MBSFN backhaul configuration , Multimedia Broadcast multicast service Single Frequency Network backhaul configuration), etc., but is not limited to this, and may also include other information, which is not limited in this embodiment;

Step 205: The home base station to be connected feeds back configuration information to relay node 2, such as physical cell identification (PCI, Physical Cell Identify), tracking area code (TAC, Tracking Area Code), Internet protocol (IP, Internet Protocol) , sharing public land mobile communication network list (Sharing PLMN List, Sharing Public Land Mobile Network List), etc. At this time, the home base station to be connected regards relay node 2 as a user, and allocates C-RNTI and wireless uplink to the user wireless resources.

Certainly, for the realization process of step 202 and step 203, also can realize based on existing random access channel (RACH, Random Access Channel) signaling and radio resource control (RRC, Radio Resource Control) signaling; Step 204 and Each parameter in step 205 may also be transmitted together with the parameters in step 202 and step 203 .

Embodiment three

Referring to FIG. 3 , it is a signaling flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 3 of the present invention. In this embodiment, if the relay node (such as relay node 2 in the figure) cannot Knowing the node type of the neighboring node, if the broadcast information containing the node type sent by the neighboring node is not received, it can directly initiate a request to the base station to establish a connection with the home base station. The specific process includes:

Step 301: When a relay node (such as relay node 2) randomly selects a home base station (such as the eNB in the figure) to be connected according to the network node to be selected, its own needs and network status;

Step 302: the relay node 2 sends a connection establishment request to the home base station to be connected, and the connection establishment request includes its own node type, where the node type is a relay node;

Step 303: The home base station to be connected feeds back an acceptance message to the relay node, and the acceptance message includes that the connection type is to establish a connection with the home base station to be connected, and its own node type is a base station;

Certainly, in this step, the home base station to be connected may also feed back a rejection message to the relay node 2, and the rejection message may include that a home base station cannot be configured for the relay node 2, or whether its own node type is A base station, such as a relay node;

That is to say, if the home base station to be connected is a base station and meets the admission condition, an admission message can be fed back to the relay node 2; if the home base station to be connected is a relay node, or does not meet the admission condition, then the The relay node feeds back a rejection message;

Step 304: The relay node 2 sends a configuration report to the home base station to be connected, the configuration report carries its own specific information, and the specific information may include at least one of: USIM info (such as IMSI, etc.), Max Tx Power, location , MBSFN backhaul configuration, etc.;

Step 305: The home base station to be connected feeds back configuration information to the relay node 2. The configuration information may include at least one of: PCI, TAC, IP, sharing PLMN list, etc. At this time, the home base station to be connected sends the The successor node regards a user, and allocates C-RNTI and wireless uplink radio resources for the user.

Certainly, in this embodiment, for the realization process of step 302 and step 303, also can realize based on existing RACH signaling and RRC signaling; The parameters in step 303 are passed together.

It can be seen that this embodiment 1 and embodiment 2 are the same as embodiment 3 in the advanced evolution system (LTEA, Long Term Evolution-Advanced) two-hop relay system, the relay node initiates a request to the base station to establish a connection with the home base station ; The implementation process of these two embodiments can also be applied to a multi-hop relay system. In a multi-hop relay system, a relay node can become the home base station of other relay nodes. Then, in order to form a multi-hop relay system, the relay node can initiate a request to establish a connection with the home base station to the already running relay node according to the node type of the adjacent node. The specific implementation process is similar and will not be repeated here.

In addition, the inventors of the present invention found that, in the prior art, the X2 interface is a wired interface between eNBs, and is used for exchanging information between eNBs, and a period of time delay is required during the information exchange process. For example, if the relay node 1 needs to exchange information with the running relay node 2, such as load balancing (LB, Load Balance), inter-cell interference coordination (ICIC, Inter-CellInterference Coordination), handover (HO, Hand Over), etc. , where the home base station of relay node 1 is eNB1, and the home base station of relay node 2 is eNB2, then the link that needs to be passed through the information exchange process is: relay node 1-home base station eNB1-home base station eNB2-relay node 2. That is, the information interaction process needs to go through three delays. From this, it can be seen that in the existing technology, if the relay nodes perform information interaction, it will bring additional delays. Generally, users cannot afford it. of. Therefore, after the relay node is introduced in the prior art, the communication delay between the relay nodes increases, which leads to the degradation of the performance of the system.

For a relay node 1, its home base station is eNB1, if it needs to exchange information with neighboring base stations of eNB1, such as LB (load balancing), ICIC (inter-cell interference coordination), HO (handover), etc., its relay node 2 home base station eNB2, the link that needs to pass is: relay node 1-home base station eNB1-home base station eNB2, the information exchange process needs to go through two delays, which also brings additional time delay compared with the existing technology In general, the delay is unbearable for users. Therefore, after introducing the relay, relaying the communication delay between the neighboring base station of the home base station and the relay node 1 will degrade the system performance. In this regard, the embodiment of the present invention provides Embodiment 4 and Embodiment 5:

Embodiment four

Referring to FIG. 4 , it is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 4 of the present invention. In this embodiment, the relay node can , select a relay node, and initiate a request to establish a wireless X2 interface to the selected relay node, the specific process includes:

Step 401: Obtain the node type of the adjacent node, and select a relay node to be connected;

When a relay node (ie, relay node 2 in the figure) obtains the node type of the adjacent node, the relay node 2 selects a relay node 1 to be connected according to the node type of the adjacent node;

Step 402: The relay node 2 sends a connection establishment request to the selected relay node 1 to be connected, for example, to establish an RRC connection, and the connection establishment request carries its own node type as a relay node, and/or connects The type is "Establish Wireless X2 Interface" and so on;

Step 403: The relay node 1 to be connected feeds back an acceptance message to the relay node 2, and the acceptance message includes accepting the establishment request of the wireless X2 interface;

Of course, in this step, if the relay node 1 to be connected feeds back a rejection message to the relay node 2, the rejection message includes the establishment request that the wireless X2 interface cannot be received;

Step 404: The relay node 2 sends a resource allocation request message to the relay node 1 to be connected, the resource allocation request message includes its own specific information, and the specific information may include at least one of: USIM info (such as IMSI ), Max Tx Power, location, MBSFN backhaul configuration, etc. At this time, the relay node 2 regards the relay node 1 to be connected as a user, and allocates C-RNTI and wireless uplink radio resources for the user;

Step 405: The relay node 1 to be connected feeds back resource allocation response information to the relay node 2. The resource allocation response information may include but at least one of: PCI, TAC, IP, sharing PLMN list, etc. At this time, The relay node 1 to be connected regards the relay node 2 as a user, and allocates C-RNTI and wireless uplink radio resources for the user.

Certainly, in this embodiment, for the realization process of step 402 and step 403, also can realize based on existing RACH signaling and RRC signaling; The parameters in step 403 are transmitted together, and the resource allocation response process may also be based on RRC signaling.

Embodiment five

Referring to FIG. 5, it is a specific flowchart of a method for establishing a connection between a relay node and a network node provided in Embodiment 5 of the present invention. In this embodiment, if the relay node cannot know the node type of the adjacent node, such as If the broadcast information containing the node type sent by the adjacent node is not received, the relay node can directly initiate a request to establish a wireless X2 interface to another relay node. The specific process includes:

Step 501: When a relay node (such as relay node 2 in the figure) selects a relay node to be connected (such as relay node 1 in the figure) according to its own needs and/or network conditions;

Step 502: the relay node 2 sends a connection establishment request to the relay node 1 to be connected, and the connection establishment request carries its own node type as a relay node and the identifier of the home base station;

Step 503: The relay node 1 to be connected feeds back an acceptance message to the relay node 2, which indicates that a wireless X2 interface is established, and its own node type is a relay node;

Of course, you can also feed back a rejection message, which includes disagreement to establish a wireless X2 interface, and your own node type is a base station, etc.;

Step 504: The relay node 2 sends a configuration report to the relay node 1 to be connected, carrying its own specific information, the specific information includes but not limited to: USIM info (such as IMSI), Max TxPower, location, MBSFN backhaul configuration, etc. At this time, the relay node regards the relay node to be connected as a user, and allocates C-RNTI and wireless uplink radio resources for the user;

Step 505: The relay node 1 to be connected feeds back configuration information to the relay node 2, the configuration information includes but not limited to: PCI, TAC, IP, sharing PLMN list, etc. At this time, the relay node to be connected The node regards the relay node as a user, and allocates C-RNTI and wireless uplink radio resources for the user.

Certainly, in this embodiment, for the realization process of step 502 and step 503, also can realize based on existing RACH signaling and RRC signaling; The parameters in step 303 are passed together.

The above-mentioned embodiment 4 and embodiment 5 are to establish a wireless X2 interface between the relay node and the relay node, and the relay node initiates a request for establishing a wireless X2 interface to the running relay node; the implementation process of these two embodiments It can also be applied to establish a wireless X2 interface between the relay node and the adjacent base station of the home base station, mainly to meet the requirement of direct information exchange between the relay node and the adjacent base stations of the home base station in the future. That is, in order for the relay node to perform necessary direct information exchange (for example, load balancing, ICIC, etc.)

In order to establish a wireless X2 interface connection, an air interface radio bearer is used between relay nodes to carry signaling and data of the X2 interface between upper base stations. In order to simplify the resource allocation management method, the relay nodes allocate uplink radio bearers similar to UEs to each other, so that the interference caused by the other party can be avoided or reduced through scheduling. In the connection establishment phase, relay nodes allocate C-RNTI to each other, and can schedule each other in the way of UE. For the specific implementation process, refer to FIG. 6, which is a flowchart of wireless resource allocation between relay nodes in Embodiment 6 of the present invention. . In this embodiment, taking relay node 1 and relay node 2 as an example to allocate wireless resources to each other, it specifically includes:

Step 601: the relay node 2 sends a connection establishment request message (such as an RRC connection establishment request, etc.) to the relay node 1, and the connection establishment request message includes: wireless X2 interface connection information;

Step 602: Relay node 1 sends a connection establishment response message to relay node 2, the connection establishment response message includes: assigning an uplink radio bearer (UL RB, Uplink-Radio Bearer) from relay node 1 to relay node 2 )

Step 603: After receiving the connection establishment response message, relay node 2 sends a connection establishment complete message to relay node 1;

Step 604: relay node 1 sends a connection establishment request message to relay node 2, and the connection establishment request message includes: wireless X2 interface connection information;

Step 605: Relay node 2 sends a connection establishment response message to relay node 1, the connection establishment response message includes: assigning an uplink radio bearer (UL RB, Uplink-Radio Bearer) from relay node 2 to relay node 1 )

Step 606: After receiving the connection establishment response message, relay node 1 sends a connection establishment complete message to relay node 2.

Therefore, in the embodiment of the present invention, the relay node can automatically establish a wireless X2 interface connection according to its own needs and network conditions according to the node type of the adjacent node. Through the established wireless X2 interface connection, the relay node can communicate with other network nodes Necessary direct information exchange (such as LB, ICIC, HO, etc.) can not only reduce the delay on the information exchange link, but also reduce the number of network nodes involved, and also reduce the transmission resources of the corresponding air interface and ground interface In particular, if the node type of the adjacent node can be obtained, the goal of establishing the wireless X2 interface can be clearly defined, so as to avoid blind requests and reduce the probability of being rejected.

Correspondingly, an embodiment of the present invention also provides a method for establishing a connection between a relay node and a network node, the flow chart of which is shown in FIG. 7 , and the method includes:

Step 701: The network node receives a connection establishment request message sent by a node accessing the network, and the connection establishment request message includes: the node type and/or connection type of the node;

Wherein, the connection establishment request message may further include: Universal Mobile Subscriber Identity Code, maximum transmit power, location, wireless single frequency network backhaul configuration for multimedia broadcast multicast services;

Step 702: The network node judges whether the node is a relay node according to the node type and/or connection type of the node; if so, execute step 703; otherwise, execute step 704;

Step 703: Send a connection establishment response message to the node;

Step 704: Perform processing according to the node type and/or connection type of the node; for example, if the node is judged to be a UE, it may be processed according to the existing processing flow for UE.

Wherein, the connection establishment response message may further include: configuration parameters of the wireless backhaul link, cell-wireless network temporary identification and wireless uplink resources allocated for the relay node; wherein, the configuration parameters of the wireless backhaul link include : Physical Cell Identifier, Tracking Area Code, Internet Protocol, and List of Shared Public Land Mobile Networks.

Wherein, the network node may be: a home base station, a neighboring base station of the home base station, or a relay node.

Wherein, the method may further include: when the network node is a neighboring base station or relay node of the home base station, the node accessing the network and the neighboring base station or relay node of the home base station allocate a cell- Wireless network temporary identifier and wireless uplink resources.

That is to say, after the relay node to be connected allocates a cell-wireless network temporary identifier and wireless uplink resource for the node accessing the network, the node accessing the network also needs to provide Allocate cell-wireless network temporary identifiers and wireless uplink resources. That is, the running relay nodes in the network can allocate resources to each other, for example, allocating cell-wireless network temporary identifiers and wireless uplink resources, etc., but it is not limited to this, and can be other resources, which are not limited in this embodiment.

In this embodiment, in order to establish a wireless X2 interface connecting the relay nodes, an air interface radio bearer is used between the relay nodes to carry signaling and data of the upper layer X2 interface. In order to simplify the resource allocation management method, the relay nodes allocate uplink radio bearers similar to UEs to each other, so that the interference caused by the other party can be avoided or reduced through scheduling. Therefore, during the connection establishment phase (for example, RRC connection establishment, etc.), relay nodes can allocate C-RNTI and uplink radio resources to each other.

Based on the implementation process of the above method, the embodiment of the present invention also provides a device for establishing a connection between a relay node and a network node. The schematic diagram of its structure is shown in FIG. 8 , and the device includes: an establishment request sending unit 81 and an establishment response receiving unit 82 , wherein the establishment request sending unit 81 is configured to send a connection establishment request message to the selected network node to be connected, the connection establishment request message including: the node type and/or connection type of the own node; the establishment The response receiving unit 82 is configured to receive a connection establishment response message sent by the network node to be connected.

The device may further include: a judging unit, a first selecting unit and a second selecting unit, wherein the judging unit is used to judge whether the node type of the adjacent network node has been known, and if so, the neighboring network node has been known The judgment result of the node type of the network node is sent to the second selection unit; otherwise, the judgment result of the unknown node type of the adjacent network node is sent to the first selection unit;

The first selection unit is configured to select a network node as the waiting network node according to the type of network node to be connected, and its own situation and/or network situation when receiving the judgment result of learning the node type of the adjacent network node. the connected network node, and notify the establishment request sending unit of the selected network node to be connected;

The second selection unit is configured to select one of the adjacent network nodes matching the network node type to be connected according to the network node type to be connected and the node type of the adjacent network node sent by the judging unit. The network node serves as the network node to be connected, and notifies the establishment request sending unit of the selected network node.

Wherein, the network node to be connected selected by the first selection unit or the second selection unit specifically includes: a home base station in the operating network, a neighboring base station of the home base station, or a relay node; wherein, the home base station Specifically: the actual home base station in the two-hop relay system; or, the actual home base station or the relay node serving as the home base station in the multi-hop relay system.

Wherein, the judging unit obtains the node type of the adjacent network node from the synchronization channel, the broadcast channel and/or the system message of the network node.

The device may further include: a setting unit, configured to pre-add or define information bits in a synchronization channel of the network node, and/or a broadcast channel, and/or a system message, and the information bits are used to indicate the The node type or supported interface type of the adjacent network node. Wherein, the relay node includes: a type 1 relay node and/or a type 2 relay node; and/or a layer 1 relay node, a layer 2 relay node, and/or a layer 3 relay node; the interface includes : Un interface, S1 interface and/or X2 interface.

In this embodiment, the connection establishment request message sent by the establishment request sending unit further includes: UMSID, maximum transmit power, location, MBMSSFN backhaul configuration;

The connection establishment response message received by the establishment response receiving unit includes at least one of the following:

The node type of the network node to be connected, the type of connection, the configuration parameters of the wireless backhaul link, the cell-wireless network temporary identifier and the wireless uplink resource allocated for the relay node; wherein, the wireless backhaul link Configuration parameters include: physical cell identity, tracking area code, internet protocol, and list of shared public land mobile networks.

For the implementation process of the functions and roles of each unit in the device for establishing a connection between the relay node and the network node, please refer to the implementation process of the corresponding method above, and will not be repeated here.

Correspondingly, the embodiment of the present invention also provides a device for establishing a connection between a relay node and a network node, its structural schematic diagram is shown in FIG. 93, wherein the establishment request receiving unit 91 is configured to receive a connection establishment request message sent by a node accessing the network, the connection establishment request message including: the type of connection and/or the node type of the node; the determination unit 92, It is used to determine that the node is a relay node according to the type of the connection and/or the node type of the node, and then send a notification that the node is a relay node; establish a response sending unit 93, for receiving the determination unit When sending the notification that the node is a relay node, send a connection establishment response message to the node.

Wherein, the device for establishing a connection between the relay node and the network node is integrated on the home base station, the adjacent base station of the home base station, or the relay node in the operating network; or independently deployed in the network; wherein the home base station is specifically two The actual home base station in the hop relay system; or, the actual home base station or the relay node serving as the home base station in the multi-hop relay system.

Wherein, when the device for establishing a connection between the relay node and the network node is integrated on the adjacent base station or relay node of the home base station, the node accessing the network and the adjacent base station or relay node of the home base station of the network are assigned to each other Cell - wireless network temporary identifier and wireless uplink resources.

For the implementation process of the functions and effects of each unit in the above distribution device, please refer to the implementation process of the corresponding method above, and will not be repeated here.

It can be seen that in the embodiment of the present invention, the relay node can automatically establish a connection with the home base station and establish a wireless X2 interface connection according to the node type of the adjacent node according to its own needs and network conditions, and connect through the established wireless X2 interface. Relay nodes can perform necessary direct information exchange with other network nodes (such as LB, ICIC, HO, etc.), which can not only reduce the delay on the information exchange link, but also reduce the number of network nodes involved and the corresponding The transmission resources of the air interface and the transmission resources of the ground interface, especially if the relay node can obtain the node type of the adjacent node, it can clearly establish the connection with the network node and/or establish the goal of the wireless X2 interface, avoiding blind requests and reducing Small chance of rejection.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (22)

1. A method for establishing a connection between a relay node and a network node, comprising: Send a connection establishment request message to the selected network node to be connected, where the connection establishment request message includes: its own node type and/or connection type; Receive a connection establishment response message sent by the network node to be connected. 2. The method according to claim 1, wherein, before sending the connection establishment request message to the selected network node to be connected, the method further comprises: When the node type of the adjacent network node has been known, then according to the type of the network node to be connected and the node type of the adjacent network node, select an adjacent network node that matches the type of the network node to be connected The network node serves as the network node to be connected; When the node type of the adjacent network node is not known, one of the adjacent network nodes is selected as the network node to be connected according to the type of network node to be connected, and its own situation and/or network situation. 3. The method according to claim 1, wherein, before sending the connection establishment request message to the selected network node to be connected, the method further comprises: When the node type of the adjacent network node and the interface type supported by the adjacent network node have been known, then select one that is compatible with the described adjacent network node according to the type of network node to be connected and the node type of the adjacent network node. The adjacent network node whose type matches the network node to be connected and whose supported interface type matches the connection type to be established serves as the network node to be connected. 4. The method according to claim 2 or 3, wherein the learning of the node type of the adjacent network node or the interface type supported by the adjacent network node is specifically: The node type of the adjacent network node or the interface type supported by the adjacent network node is learned from the synchronization channel, and/or broadcast channel, and/or system message of the adjacent network node. 5. method according to claim 4, is characterized in that, described method also comprises: Pre-adding or defining information bits in the synchronization channel, broadcast channel and/or system message of the adjacent network node, where the information bit is used to indicate the node type or supported interface type of the adjacent network node. 6. The method according to claim 2, wherein when the node type of the adjacent network node is not known: When the network node to be connected is a relay node or a neighboring base station of the home base station, the connection establishment request message further includes: the home base station identifier. 7. The method of claim 6, wherein, When the network node to be connected selected according to its own situation and/or network situation is the home base station, and the network node to be connected is the home base station, the connection establishment response message includes: the node type of the home base station, and /or the type of the connection is to establish a connection with the home base station; When the network node to be connected selected according to its own situation and/or network situation is a relay node, and the network node to be connected is a relay node, the connection establishment response message includes: the relay node the type of node, and/or the type of the connection is to establish a wireless X2 interface; When the type of network node to be connected selected according to its own situation and/or network situation is a neighboring base station of the home base station, and the network node to be connected is a neighboring base station of the home base station, the connection establishment response message Including: the node type of the neighboring base station of the home base station, and/or the type of the connection is to establish a wireless X2 interface. 8. The method according to claim 2, wherein when the node types of adjacent network nodes are known: When the network node to be connected is the home base station, in the connection establishment request message: the type of connection is to establish a connection between the relay node and the home base station; When the network node to be connected is a relay node, in the connection establishment request message: the type of connection is that the relay node establishes an X2 interface with another relay node, and the connection establishment request message also includes a home base station identifier; When the network node that needs to be connected is a neighboring base station of the home base station, in the connection establishment request message: the type of connection is to establish an X2 interface between the relay node and the neighboring base station of the home base station, and the connection establishment request message also includes ID of the home base station. 9. The method of claim 8, wherein The connection establishment response message includes: the result of the connection establishment is success or failure, and if the connection establishment result is failure, the connection establishment response message further includes the reason for the failure. 10. The method according to claim 7 or 8, wherein the home base station is specifically: a home base station in a two-hop relay system; or, a home base station in a multi-hop relay system; or, a home base station in a multi-hop relay system The relay node as the home base station in the relay system. 11. The method according to any one of claims 1 to 7 or 9, characterized in that, The connection establishment request message also includes at least one of the following: Universal Mobile Subscriber Identification Code, maximum transmit power, location and MBMSSFN backhaul configuration; When the connection establishment result is successful, the connection establishment response message further includes: a cell-wireless network temporary identifier and a wireless uplink resource allocated for the relay node; When the connection establishment result is successful, and when the network node to be connected is a home base station, the connection establishment response message further includes: configuration parameters of the wireless backhaul link, wherein the configuration parameters of the wireless backhaul link Include at least one of: Physical Cell Identity, Tracking Area Code, Internet Protocol, and List of Shared Public Land Mobile Networks. 12. A method for establishing a connection between a relay node and a network node, comprising: The network node receives a connection establishment request message sent by a node accessing the network, where the connection establishment request message includes: the node type of the node and/or the connection type; The network node judges whether the node is a relay node according to the node type and/or connection type of the node; if so, sends a connection establishment response message to the node. 13. The method according to claim 12, wherein the network node is: a home base station, a neighboring base station of the home base station, or a relay node. 14. The method of claim 12, wherein, The connection establishment request message also includes: Universal Mobile Subscriber Identification Code, maximum transmission power, location, MBMSSFN backhaul configuration; When the connection establishment result is successful, the connection establishment response message includes at least one of: the node type of the network node, the connection type, the cell-wireless network temporary identifier and wireless uplink resource allocated for the relay node; When the connection establishment result is successful, and when the large network node to be connected is a home base station, the connection establishment response message further includes: configuration parameters of the wireless backhaul link, wherein the configuration parameters of the wireless backhaul link Include at least one of: Physical Cell Identity, Tracking Area Code, Internet Protocol, and List of Shared Public Land Mobile Networks. 15. The method of claim 12, further comprising: When the network node is a neighboring base station or relay node of the home base station, the node accessing the network and the neighboring base station or relay node of the home base station allocate cell-wireless network temporary identifiers and wireless uplink resources to each other. 16. A device for establishing a connection between a relay node and a network node, comprising: An establishment request sending unit, configured to send a connection establishment request message to the selected network node to be connected, where the connection establishment request message includes: the node type and/or connection type of itself; The establishment response receiving unit is configured to receive the connection establishment response message sent by the network node to be connected. 17. The device according to claim 16, further comprising: a judgment unit, a first selection unit, and a second selection unit, wherein, The judging unit is used to judge whether the node type of the adjacent network node has been known, and if so, send the judgment result that the node type of the adjacent network node has been known to the second selection unit; otherwise, it will not know the adjacent network node The judgment result of the node type of the node is sent to the first selection unit; The first selection unit is configured to select a network node as the waiting network node according to the type of network node to be connected, and its own situation and/or network situation when receiving the judgment result of learning the node type of the adjacent network node. the connected network node, and notify the establishment request sending unit of the selected network node to be connected; The second selection unit is configured to select one of the adjacent network nodes matching the network node type to be connected according to the network node type to be connected and the node type of the adjacent network node sent by the judging unit. The network node serves as the network node to be connected, and notifies the establishment request sending unit of the selected network node. 18. The device according to claim 16 or 17, wherein the network node to be connected selected by the first selection unit or the second selection unit specifically includes: a home base station in the operating network, a home base station of the home base station On an adjacent base station or relay node; wherein, the home base station is specifically: the actual home base station in a two-hop relay system; or, the actual home base station or a relay node serving as a home base station in a multi-hop relay system. 19. The device according to claim 16 or 17, wherein the judging unit obtains the node type of the adjacent network node from the synchronization channel of the network node, and/or the broadcast channel, and/or the system message . 20. The device according to claim 16 or 17, further comprising: A setting unit, configured to pre-add or define information bits in the synchronization channel, broadcast channel and/or system message of the network node, where the information bits are used to indicate the node type or supported interface of the adjacent network node type. 21. A device for establishing a connection between a relay node and a network node, comprising: An establishment request receiving unit, configured to receive a connection establishment request message sent by a node accessing the network, where the connection establishment request message includes: the type of connection and/or the node type of the node; A determining unit, configured to determine whether the node is a relay node according to the connection type and/or the node type of the node, and if so, send a notification that the node is a relay node; The establishment response sending unit is configured to send a connection establishment response message to the node when receiving the notification sent by the determining unit that the node is a relay node. 22. The device according to claim 21, wherein the device for establishing a connection between the relay node and the network node is integrated on the home base station, the adjacent base station of the home base station, or the relay node in the operating network; or independently Deployed in the network; wherein, the home base station is specifically an actual home base station in a two-hop relay system; or, an actual home base station in a multi-hop relay system or a relay node serving as a home base station.

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