WO2011160352A1

WO2011160352A1 - Method and network device for relay optimization in lte system

Info

Publication number: WO2011160352A1
Application number: PCT/CN2010/077473
Authority: WO
Inventors: 张鹏帅
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-23
Filing date: 2010-09-29
Publication date: 2011-12-29
Also published as: CN102300245A; CN102300245B

Abstract

A method and network device for relay optimization in a Long Term Evolution (LTE) system are provided. In the solution of the invention, the connection information between a first relay node (RN) and an evolved Node B (eNB) and the information of the neighbor RN are added into the neighbor cell table of the first RN (101); when a user equipment (UE) is handed over, the steps of the handover process are reduced according to the connection information and the information of the neighbor RN in the neighbor cell table of the first RN (102). In the UE handover process, the method and device provided by the invention enable the optimization of the handover process in a relay network and improve the handover efficiency of the LTE system by judging the connection condition between a UE and a RN and the connection condition between a RN and an eNB.

Description

LTE system relay optimization method and network device

The present invention relates to the field of communication technologies, and specifically refers to an LTE (Long Term Evolution) system relay (Relay) optimization method and a network device. Background technique

3GPP LTE (Long Term Evolution, Long Term Evolution of the Third Generation Mobile Communication) The network is a flat structure, E-UTRAN (Evolved UTRAN, Evolved Universal Terrestrial Radio Access Network) by eNB (Base Station) and EPC (Evolved Packet Core) , Evolved Packet Switching Center). The eNB is connected to the EPC through the S1 interface, and the eNBs are connected through the X2 interface. The S1 interface and the X2 interface are logical interfaces, one EPC can manage one or more eNBs, and one eNB can also be controlled by multiple EPCs, and one eNB manages multiple cells.

Relay technology is one of the core technologies of LTE-A (Long Term Evolution-Advance). The Relay network is used to achieve blind spot coverage and increase the throughput of the system cell edge. The introduction of Relay in LTE-A is mainly to improve the data coverage, group mobility, temporary network deployment speed, throughput in the cell edge area, and coverage of new areas in the LTE system.

The RN (Relay Node) is connected to the eNB through the Un interface. As shown in Figure 1, the Un interface is a wireless interface. The RN is connected to the UE (User Equipment) through the Un interface.

In the prior art, some operational steps in the relay implementation process are not necessary, such as: data back-transfer operation between the RN and the connected eNB during the handover process, and these operation steps may cause the handover efficiency of the LTE system to be low. Therefore, these operation steps need to be reduced. However, the prior art cannot determine whether the above operation steps need to be reduced, thus resulting in the entire LTE. The switching efficiency of the system is low. Summary of the invention

In view of the above, the main purpose of the present invention is to provide a LTE system relay optimization method and a network device. During the UE handover process, it is determined which operation steps need to be performed to optimize the Relay process.

The technical solution adopted by the present invention to solve the technical problems thereof is:

An LTE system relay optimization method includes: adding, in a neighboring cell table of a first relay node RN, connection information of the first RN and a base station eNB and information of a neighboring RN; when the user equipment UE performs handover, according to the The connection information in the neighbor table of the first RN and the information of the neighboring RN are used to cut the steps in the handover process.

After the connection information of the first RN and the eNB and the information of the neighboring RN are added to the neighboring cell of the first RN, the method further includes: sending the connection information in the neighboring cell table of the RN to the eNB, and saving In the neighbor table of the eNB.

The connection information includes: whether the first RN is connected to the core network through the eNB.

Before the UE performs the handover, the method further includes: receiving a measurement report sent by the UE; determining, according to the measurement report, a cell with the best signal quality, and determining an RN or an eNB to which the cell with the best signal quality belongs, and determining to use the UE Switch to the cell with the best signal quality.

A network device, comprising: a list setting unit, configured to add connection information of the first RN and an eNB and information of a neighboring RN in a neighbor table of the first RN; and a clipping unit, configured to: when the UE performs handover, according to The connection information in the neighbor table of the first RN and the information of the neighboring RN are used to cut the steps in the handover process.

The network device further includes: an information sending unit, configured to send connection information in the neighboring cell table of the RN to the eNB, and save the information in a neighboring cell table of the eNB.

The network device further includes: a report receiving unit, configured to receive a measurement report sent by the UE; And a switching unit, configured to determine, according to the measurement report, a cell with the best signal quality, and determine an RN or an eNB to which the cell with the best signal quality belongs, and switch the UE to the cell with the best signal quality.

The technical solution of the present invention has the following beneficial effects: The method and the device provided by the present invention optimize the handover process of the Relay network by judging the connection between the UE and the RN, the RN and the eNB during the handover process of the UE. , improve the switching efficiency of the LTE system. DRAWINGS

1 is a network architecture diagram provided by the prior art;

2 is a flowchart of a method according to an embodiment of the present invention;

3 is a schematic diagram of a relay network arrangement according to an embodiment of the present invention;

FIG. 4 is a network architecture diagram of a UE switching between RNs according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a UE switching between an RN connected to a core network through an eNB and an RN directly connected to a core network according to an embodiment of the present invention; Network architecture diagram;

FIG. 6 is a schematic diagram of a network architecture of a UE switching between an RN and an eNB connected to the RN according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a network device according to another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a network device according to another embodiment of the present invention. detailed description

The implementation, functional features and advantages of the objects of the present invention will be further described in conjunction with the embodiments herein.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. An embodiment of the present invention provides a method for optimizing an LTE system Relay. As shown in FIG. 2, the method includes the following steps:

S101. The connection information of the first RN and the eNB and the information of the neighboring RN are added to the neighboring cell of the first RN.

In a specific embodiment, the connection information includes: whether the first RN is connected to the eNB through another RN and/or whether the first RN is connected to the core network through the eNB. In this embodiment, whether the first RN is connected to the eNB through other RNs and/or the first one is determined by whether the RN and the eNB's ID (identity identification) information are in the neighboring cell table of the first RN. Whether the RN is connected to the core network through the eNB. The specific field information is shown in Table 1 below:

Table 1

The RN-related information added in the neighbor table of the RN is listed in Table 1. Whether the range of connection with the eNB is represented by 0-1: 0 means that there is no connection with the eNB, which means that the RN is directly connected to the core network, and the connected eNB information is invalid; 1 indicates that the RN is connected to the eNB, and the connected eNB information is valid.

For example, if the neighboring cell of the first RN has the ID of the eNB, the RN is connected to the core network through the eNB. If there is no ID of the eNB, the first RN is directly connected to the core network.

If the neighboring cell of the first RN has an ID of another RN, the first RN is in an adjacency relationship with the other RN, and according to the foregoing method, whether the eNB ID is determined in the neighboring cell table of the neighboring RN Whether the adjacent RN is connected to the core network through the eNB or directly accesses the core network.

S102. When the UE performs handover, according to the connection information in the neighbor table of the first RN. The information of the neighboring RN is used to cut the corresponding steps in the handover process, such as: the step of reducing the data back-transmission operation.

In a further embodiment, in S101, the connection information of the first RN and the eNB and the information of the neighboring RN are added to the neighboring cell of the first RN, and then further includes:

S103. Send the connection information in the neighboring cell table of the RN to the eNB, and save the information in the neighboring cell table of the eNB. To facilitate the connection in the neighboring cell table of the eNB when the UE performs the handover. The information and the RN information connected by the eNB are modified for corresponding steps in the handover process. In this way, some unnecessary steps in the UE handover process are performed by the connection information of the eNB in the neighboring cell table of the eNB, for example, the data back-transfer operation between the RN and the connected eNB in the handover process is reduced. .

In addition, in other embodiments, the S103 is configured to send the connection information in the neighboring cell table of the RN to the eNB, and save the information in the neighboring cell table of the eNB, so that when the UE performs handover, according to The connection information in the neighboring cell table of the eNB and the RN information connected by the eNB are used to cut corresponding steps in the handover process. At S102, when the UE performs handover, the steps in the handover process are performed according to the connection information in the neighboring cell table of the first RN, and the object of the present invention can also be achieved to achieve the present invention. Technical effect.

The present invention will be described in more detail below with reference to specific application examples.

As shown in Figure 3, in the hotspots of the city, the goal of deploying RN is to enhance coverage, improve user throughput, and improve spectrum efficiency. The RN is fixed. The RN has a small cell range and is densely deployed. The UE has a high density and can use Layer 3 Relay.

In this scenario, the UE may switch between the RNs, or the UE may switch between the RN and the eNB, or the UE may switch between the eNBs connected by the RN.

Embodiment 1: The UE switches between RNs, as shown in FIG. 4: RN1 is connected to RN2 and RN3 to different eNBs, that is, RN1 is connected to eNB1, RN2 and RN3 are connected to the same eNB2, and eNB1 and eNB2 are respectively connected to the core. Network (MME/S-GW), cell A belongs to RN1, cell B Affiliated to RN2, cell C belongs to RN3.

According to the method of the present invention, the specific implementation process is as follows:

The UE currently camps on cell B, and the UE sends a measurement report to RN2.

According to the measurement report, the RN2 finds that the signal quality of the cell A is better than that of the cell B, and the signal quality of the cell C is better than that of the cell B, and the RN2 decides that handover is required, and the cell A and the cell C are candidate cells of the handover target cell.

If the final handover decides to perform handover between the cell A and the cell B, the RN2 checks the eNB connection information in the neighbor table and the information of the neighboring RN1, and finds that RN2 and RN1 are respectively connected to different eNBs, so the data in the handover process The reverse transmission operation step may be performed only between the eNBs, or between the RNs, or simultaneously between the eNBs and the RNs.

If the final handover decides to switch between the cell B and the cell C, the RN1 checks the information of the neighbor table, and finds that the RN2 and the RN3 are connected to the same eNB2, so the data back-transfer operation step in the handover process is only between the RNs. get on.

Embodiment 2: The UE switches between the RN1 connected to the eNB and the RN2 directly connected to the core network, as shown in FIG. 5: RN1 is connected to the eNB, RN2 is directly connected to the core network, and the cell A belongs to the RN1, and the cell B belongs to the RN2.

The UE currently camps on cell A, and the UE sends a measurement report to RN1.

According to the measurement report, RN1 finds that the signal quality of cell B is better than that of cell A, and the RN1 decision needs to be switched.

The RN1 checks the information of the neighboring cell table and finds that the RN1 is connected to the eNB, and the RN is directly connected to the core network. Therefore, the data back-transmission operation step in the handover process is only performed between the RNs, or the data back-transmission operation steps are performed.

Embodiment 3: The UE switches between the RN and the eNB connected to the RN. As shown in FIG. 6, the RN1 is connected to the eNB1, the eNB1 is connected to the core network, the cell A belongs to the RN1, and the cell B belongs to the eNB1. According to the method of the present invention, the specific implementation process is as follows:

The UE currently camps on cell A, and the UE sends a measurement report to RN1.

The RN1 checks the information of the neighboring cell table and finds that the eNB1 to which the target cell belongs is the same as the eNB1 to which the RN1 is connected. Therefore, the data backhaul operation step in the handover process can be reduced.

In summary, the foregoing embodiment uses the handover of the UE in the Relay network as an example to describe whether the present invention connects to the eNB in the neighbor table of the RN node, and the related information of the connected eNB, and determines whether the related operation is performed when the related operation is switched. It is necessary to reduce related operations and reduce unnecessary steps to optimize the switching process and improve switching efficiency.

The embodiment of the present invention further provides a network device. As shown in FIG. 7, the network device includes: a list setting unit 710, configured to add connection information and adjacency of the first RN to the eNB in a neighbor table of the first RN. RN information;

The reducing unit 720 is configured to: when the UE performs the handover, perform, according to the connection information in the neighboring cell table of the first RN and the information of the neighboring RN, the corresponding step in the handover process.

In this embodiment, the connection information includes: whether the first RN is connected to the core network through the eNB, or is directly connected to the core network; the information of the neighboring RN is: an ID of the neighboring RN, and an identifier of the neighboring RN The neighboring cell table determines whether the neighboring RN is connected to the core network through the eNB or directly to the core network.

In a further embodiment, as shown in FIG. 8, the network device further includes:

The information sending unit 730 is configured to send the connection information in the neighboring cell table of the RN to the eNB, and save the information in the neighboring cell table of the eNB, and when the UE performs the handover, according to the neighboring cell table of the eNB. The connection information in the process is reduced for the corresponding steps in the handover process.

Corresponding steps in the handover process of the information of the neighboring cell table of the eNB are tailored to the phase in the handover process by using the connection information in the neighboring cell table of the first RN and the information of the neighboring RN. The steps to be taken should be the same.

In a further embodiment, as shown in FIG. 9, the network device, based on FIG. 7 and FIG. 8, further includes:

a report receiving unit 740, configured to receive a measurement report sent by the UE;

The switching unit 750 is configured to determine, according to the measurement, a cell with the best signal quality and an RN or an eNB to which the cell with the best signal quality belongs, and switch the UE to the cell with the best signal quality.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Claim

An LTE system relay optimization method, the method includes: adding, in a neighboring cell table of the first relay node RN, connection information of the first RN and the base station eNB and information of the neighboring RN;

When the user equipment UE performs the handover, the steps in the handover process are performed according to the connection information in the neighboring cell table of the first RN and the information of the neighboring RN.

The method according to claim 1, wherein after the adding the connection information of the first RN and the eNB and the information of the neighboring RN in the neighboring cell table of the first RN, the method further includes: The connection information in the neighbor list is sent to the eNB and stored in the neighbor table of the eNB.

The method of claim 1, wherein the connection information comprises: whether the first RN is connected to the core network by using an eNB.

The method according to any one of claims 1 to 3, wherein before the UE performs handover, the method further includes:

Receiving a measurement report sent by the UE;

Determining a cell with the best signal quality and determining an RN or eNB to which the cell with the best signal quality belongs according to the measurement report, and determining to switch the UE to the cell with the best signal quality.

5. A network device, comprising:

a list setting unit, configured to add, in the neighboring cell table of the first RN, connection information of the first RN and the eNB and information of the neighboring RN;

And a clipping unit, configured to: when the UE performs the handover, perform the step of the handover process according to the connection information in the neighboring cell table of the first RN and the information of the neighboring RN.

The network device according to claim 5, wherein the network device further includes: an information sending unit, configured to send connection information in a neighbor table of the RN to the The eNB is stored in a neighbor table of the eNB.

The network device according to claim 5, wherein the connection information comprises: whether the first RN is connected to the core network through the eNB.

The network device according to any one of claims 5 to 7, wherein the network device further comprises:

a report receiving unit, configured to receive a measurement report sent by the UE;

And a switching unit, configured to determine, according to the measurement report, a cell with the best signal quality and an RN or an eNB to which the cell with the best signal quality belongs, and switch the UE to the cell with the best signal quality.