WO2013139231A1

WO2013139231A1 - Method for selecting cell in relay system, terminal, relay node, and system

Info

Publication number: WO2013139231A1
Application number: PCT/CN2013/072654
Authority: WO
Inventors: 闫渊; 刘建军; 沈晓冬; 刘光毅
Original assignee: 中国移动通信集团公司
Priority date: 2012-03-20
Filing date: 2013-03-15
Publication date: 2013-09-26
Also published as: CN103327550A

Abstract

Embodiments of the present invention provide a method for selecting a cell in a relay system, a terminal, a relay node, and a system. The method comprises: in a relay system, when selecting a cell, a terminal selecting the cell with assistance of channel quality of a relay backhaul link. In this manner, compared with the prior art in which a cell is selected merely according to channel quality of an access link and channel quality of a direct link, a cell selection solution is optimized, and performance of the terminal is improved, thereby solving a problem in which performance of the terminal is poor due to poor conditions of the backhaul link when a cell is selected according to channel quality of the access link and channel quality of the direct link.

Description

The invention relates to a cell selection method, a terminal, a relay node and a system in a relay system. The application is submitted to the Chinese Patent Office on March 20, 2012, and the application number is 201210074895.4, and the invention name is "a cell selection method in a relay system. The priority of the Chinese patent application, the terminal, the relay node and the system, the entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communications, and in particular, to a cell selection method, a terminal, a relay node, and a system in a relay system. Background technique

In order to cope with various complex wireless propagation environments and solve the coverage problem of future Long Term Evolution (LTE) network deployment, the 3rd Generation Partnership Project (3GPP) is in the enhanced long-term evolution (Long Term Evolution). -Advanced, LTE-A) In the R10 version protocol, a relay node (RN) (which can be called a relay) is standardized. By adding a relay node between the macro base station (eNB) and the user terminal (RUE), the direct transmission link between the macro base station and the terminal is divided into two segments, as shown in FIG. 1, the macro base station and the relay. The wireless link between them is called the backhaul link (unhave link), and the wireless link between the relay and the terminal is called the access link (Uu interface). By properly deploying the relay node, the split two links can have a shorter propagation distance than the direct transmission link, and the obstructions in the propagation path can also be reduced, so that the two segments after the split The links all have better wireless propagation conditions and higher transmission capabilities than direct transmission links.

The main features of RN include:

(1) Provide wireless backhaul. In some scenarios where fiber cannot be reached or wired backhaul is difficult to construct (for example: indoor office environment without room allocation, residential buildings with fiber-free access, urban micro-coverage without cable return, remote suburbs or rural areas, etc.) By introducing a relay with wireless backhaul function, the coverage can be effectively extended, and the problem of lack of optical fiber resources can be solved, and the deployment is flexible and convenient.

(2), address coverage enhancement. In the LTE-A R10 phase, at present, the relay is mainly used to solve the coverage enhancement rather than the capacity enhancement. By introducing the relay station, the shadow coverage area and even the dead zone generated by the tall building group can be eliminated, and the coverage capability of the base station is improved.

The types of relays can be classified into Inband Relay and Outband Relay. The backhaul link of the in-band relay (between the macro base station and the relay) and the access link (between the relay and the terminal) are transmitted in the same frequency band resource, time division multiplexing; backhaul of the outband relay The link (between the macro base station and the relay) and the access link (between the relay and the terminal) are transmitted in different frequency bands, and frequency division multiplexing. Therefore, the relay transmission consumes more than the macro base station direct connection transmission mode. Time-frequency resources.

In the LTE-A system, the type 1 relay (Type-1 RN) is mainly considered. The type 1 relay has its own independent cell ID (Cell ID), which is equivalent to an independent cell and can be processed by layer 3. .

In a relay system composed of Type 1 relays, the RUE uses cell selection, such as comparing Reference Signal Receiving Power (RSRP) from the donor base station (Donor e B, De B ) and the RN ( Or refer to the Signal Receiving Quality (RSRQ) to select whether to access the DeNB or the RN. For RUE, DeNB and RN are equivalent when performing cell selection.

In the LTE-A heterogeneous network (HetNet) scenario, a Pico-cell (Pico-cell, which can be called a Pico) can select a metric in the cell to absorb more users. The cell selection metric can be an access chain. An offset (bias, and bias>0) is configured in the RSRP (or RSRQ) of the path. For the terminal, the metric of the Pico is changed to the sum of RSRP (or RSRQ) and bias, thereby increasing the terminal. The probability of connecting to this Pico is equivalent to increasing the coverage of Pico, which is the Cell Selection and Cover Extension (RE) under HetNet.

However, unlike RN, Pico's backhaul link is optical fiber, so its capacity can be considered as unlimited. However, the RN's backhaul link occupies the air interface radio resource of the DeNB, and the capacity is limited. If the RN's backhaul link channel is not good, and the RN still configures the offset in the cell selection metric determined according to the access link status to cover the extension to absorb more terminals, then the backhaul link The throughput will seriously affect the performance of the RUE. For example, in FIG. 2, it is assumed that the channel shield of the access link of RUE1~RUE3 is better than the access link of RUE4~RUE6, but the channel shield of the backhaul link of RN1 is worse than the backhaul link of RN2. Therefore, the performance of RUE1~RUE3 is worse than the performance of RUE4~RUE6.

As shown in FIG. 3, it is assumed that the channel shield of RUE1 directly connected to the DeNB is RSRQ1, the channel shield of the back link of RN1 is RSRQO, and the channel shield of the access link of RUE1 connected to RN1 is RSRQ2, if RSRQ0<RSRQ 1 <RSRQ2 , ^才才才居 ί see Fang because RSRQKRSRQ2, I'J RUEl wife into RN1, but at this time due to the fact that RSRQ0 <RSRQ1, RUE1 performance is poor, and if RUE1 chooses to directly access DeNB Get better performance.

In summary, in the cell selection scheme of the existing relay system, the RUE only considers when selecting a relay or a base station.

The access link status between the RUE and the relay and the direct link status between the RUE and the base station. In fact, there may be a scenario in which the access link between the RUE and a relay is in good condition, but the backhaul link between the relay and the base station is in poor condition, if the RUE is accessed. If the link status is good and the access is selected, the performance of the RUE may be poor due to poor return link conditions. Summary of the invention

Embodiments of the present invention provide a cell selection method, a terminal, a relay node, and a system in a relay system, which are used for optimization.

'J, district selection scheme, improve the performance of the terminal of the relay system service. A cell selection method in a relay system, the method comprising:

The terminal measures the access link and the direct link, determines the access link channel shield and the direct link channel shield, and determines the backhaul link channel shield according to the information sent by the received relay node. ;

The terminal performs cell selection according to the access link channel shield, the backhaul link channel shield, and the direct link channel shield. a cell selection method in a relay system, the method comprising:

The relay node determines an offset value according to the backhaul link channel shield, and the offset value is used for performing relay node coverage extension; the relay node broadcasts the offset value to the terminal, so that the terminal according to the offset value And determining, by the access link channel, the cell selection metric corresponding to the relay node, determining a cell selection metric corresponding to the host base station according to the direct link channel metric, and the host with the largest cell selection metric value The base station or the relay node determines the selected cell, and the cell selection metric is used to indicate the probability that the terminal selects the cell.

A cell selection method in a relay system, the method comprising:

The relay node determines a backhaul link channel shield parameter;

The relay node configures a backhaul link channel shield parameter by using radio resource control RRC signaling, so that the terminal determines, according to the backhaul link channel shield parameter and the access link channel shield quantity, the relay node corresponding to the relay node a cell selection metric, determining a cell selection metric corresponding to the host base station according to the direct link channel metric, wherein the cell selection metric is used to indicate a probability that the terminal selects the cell, and the host with the largest cell selection metric is the largest The base station or relay node is determined to be the selected cell.

A cell selection system in a relay system, the system comprising a relay node and a terminal, wherein:

The relay node is configured to send, to the terminal, information for determining a backhaul link channel shield quantity;

The terminal is configured to measure an access link and a direct link, determine an access link channel shield and a direct link channel shield, and determine a return chain according to the information sent by the received relay node. The channel channel shields, and performs cell selection according to the access link channel shield, the backhaul link channel shield, and the direct link channel shield.

A relay node, the relay node includes:

An offset value determining module, configured to determine an offset value according to a backhaul link channel shield, where the offset value is used for performing relay node coverage extension;

a broadcast module, configured to broadcast the offset value determined by the offset value determining module to the terminal, so that the terminal determines, according to the offset value, the access link channel shield quantity, a cell selection metric value corresponding to the relay node Determining a cell selection metric corresponding to the host base station according to the direct link channel shield quantity, and determining, as the selected cell, a host base station or a relay node with a corresponding cell selection metric value, where the cell selection metric value is used. Indicates the probability that the terminal selects the cell.

A relay node, the relay node includes:

a parameter determining module, configured to determine a backhaul link channel shield parameter;

a configuration module, configured to configure, by using radio resource control RRC signaling, a backhaul link channel shield parameter, so that the terminal determines the relay node according to the backhaul link channel shield parameter and the access link channel shield quantity Corresponding cell selection a metric, determining a cell selection metric corresponding to the host base station according to the direct link channel shield quantity, where the cell selection metric is used to indicate a probability that the terminal selects the cell, and the corresponding cell selection metric is the largest host base station or The relay node determines the selected cell.

A terminal, the terminal includes:

a determining module, configured to measure an access link and a direct link, determine an access link channel shield and a direct link channel shield, and determine a return chain according to the information sent by the received relay node Road channel shield

A selection module is configured to perform cell selection according to the access link channel shield, the backhaul link channel shield, and the direct link channel shield.

According to the solution provided by the embodiment of the present invention, in the relay system, when performing cell selection, the terminal cooperates with the channel shield of the relay backhaul link to assist the cell selection, so that the channel shield is compared with only the access link channel. The prior art for cell selection by directly connecting the link channel shields optimizes the cell selection scheme, improves the performance of the terminal, and solves the cell selection according to the access link channel shield and the direct link channel shield. When the backhaul link is in poor condition, the performance of the terminal is poor. DRAWINGS

1 is a schematic diagram of a wireless link between a macro base station and a terminal provided by the prior art;

2 is a schematic diagram of a relay system and a cell selection provided by the prior art;

3 is a schematic diagram of a relay system and a cell selection provided by the prior art;

4 is a flowchart of steps of a cell selection method in a relay system according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a relay system and cell selection according to Embodiment 2 of the present invention; FIG.

6 is a flowchart of steps of a cell selection method in a relay system according to Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of a relay system and cell selection according to Embodiment 4 of the present invention; FIG.

8 is a schematic structural diagram of a cell selection system in a relay system according to Embodiment 5 of the present invention;

9 is a schematic structural diagram of a relay node according to Embodiment 6 of the present invention;

10 is a schematic structural diagram of a relay node according to Embodiment 7 of the present invention;

FIG. 11 is a schematic structural diagram of a terminal according to Embodiment 8 of the present invention. detailed description

In the prior art, when the terminal performs cell selection in the relay system, only the shield of the access link of the RN/e B is considered, and the shield of the backhaul link of the RN is not considered. In fact, the performance of the RN is limited by the backhaul link. Therefore, the existing cell selection scheme may result in a situation in which the terminal cell selection does not match the performance of the service site. Embodiments of the present invention provide an enhanced cell selection scheme for further considering a backhaul link shield in a relay system, that is, a terminal according to an access link channel shield, a backhaul link channel shield, and a direct link. The channel channel shield performs cell selection, wherein The access link channel shield and the direct link channel shield may be determined by the terminal to measure the access link and the direct link, and the backhaul link channel shield may be the terminal according to the received relay node. The information sent is determined. Two different implementations are designed to solve the problems existing in the existing cell selection scheme in the relay system, thereby further improving the performance of the relay system. The solution of the present invention is mainly directed to the most widely used type 1 in-band relay in the LTE-A system.

Two different implementations of cell selection in the relay system provided by the present invention are described below with reference to the accompanying drawings in the first embodiment and the third embodiment.

Embodiment 1

A first embodiment of the present invention provides a method for selecting a cell in a relay system. The process of the method is as shown in FIG. 4, and includes:

Step 101: The relay node determines an offset value according to the backhaul link channel shield quantity.

Similar to the coverage extension in Pico, the RN can configure a bias value (Bias) in the cell selection metric (such as RSRP or RSRQ) of the relay node, which is used for relay node coverage extension, special In this embodiment,

Bias is determined based on the channel shield of the relay backhaul link.

For a backhaul link with a good channel shield, a larger Bias can be configured. For a backhaul link with a poor channel shield, a smaller Bias can be configured. Specifically, the offset value Bias can be determined by the following formula:

Bias = f (Quality of Backhaul)

Where Quality of Backhaul indicates the return link channel shield parameter, and the independent variable is

Q ^{1 if} y - °f - ^Backhaul 's function (χ) is an increasing function. The backhaul link channel shield parameter can be the backhaul link

RSRP or RSRQ.

Further, under certain conditions, in order to reduce the coverage of the RN having a poor backhaul link channel shield and the number of RUEs served by the eNB, when the channel shield of the backhaul link is less than a certain threshold, Bias It can be considered to be configured as a negative value, that is, in this embodiment, the offset value can be positive, zero or negative. By properly configuring Bias, it is possible to achieve a more reasonable coverage for the RN and further improve the performance of the RUE.

Step 102: The relay node broadcasts the offset value to the terminal.

In this step, the manner in which the relay node broadcasts the offset value is the same as that in the prior art, and details are not described herein again.

Step 103: The terminal selects a cell according to the offset value, the access link channel shield, and the direct link channel shield. In this step, the terminal may determine, according to the offset value, the access link channel shield quantity, a cell selection metric value corresponding to the relay node, where the cell selection metric value is used to indicate a probability that the terminal selects the cell, according to The direct link channel shield determines the cell selection metric corresponding to the host base station, and determines the host base station or the relay node with the corresponding cell selection metric value as the selected cell.

The solution of the first embodiment of the present invention will be described below by way of a specific example.

Embodiment 2

FIG. 5 is a schematic diagram of a relay system and a cell selection provided by the second embodiment, and the RUE3 selection in FIG. The metric of RN1 is RSRP1, the metric of RN2 is RSRP2+ Bias, and RSRP2+ Bias >RSRP1 is assumed. When cell selection, RUE3 selects RN2. Since RN2 has a better backhaul link channel shield, even if the performance of the RUE3 access link is poor, since the bottleneck of the RN system lies in the backhaul link, the RUE3's degraded access link can pass. RN2 allocates more air interface resources of the access link to compensate, so the performance of RUE3 will be improved.

According to the solution provided by the first embodiment and the second embodiment, the relay node determines the offset according to the channel shield of the backhaul link, so that the terminal can according to the offset value, the access link channel shield and the direct The link channel shield selects the cell, which mainly improves the performance of the edge users between the RN/RN and the De B/RN, and only needs to modify the RN node on the network side, and does not need to signal the terminal and related air interface. Modifications to the format also have the advantage of being easy to implement.

Embodiment 3

A third embodiment of the present invention provides a method for selecting a cell in a relay system. The process of the method is as shown in FIG. 6, and includes:

Step 201: The terminal receives a backhaul link channel shield quantity parameter.

In this embodiment, the RN may add additional broadcast signaling. In this step, the RN may directly broadcast its channel shield parameter for the backhaul link (this parameter characterizes the channel shield of the backhaul link, which may be, but is not limited to, the RSRP or RSRQ of the backhaul link). Certainly, the relay node may also configure the backhaul link channel shield parameter to the terminal by using Radio Resource Control (RRC) signaling.

Step 202: The terminal determines a cell selection metric value.

The step includes: determining, by the terminal, the cell selection metric value corresponding to the relay node according to the backhaul link channel shield parameter and the access link channel shield quantity, and determining, according to the direct link traffic shield quantity, the host base station corresponding to the The cell selection metric is used to indicate the probability that the terminal selects the cell.

In this embodiment, the operation of the terminal for additional added broadcast signaling for the relay node to broadcast the backhaul link channel metric parameter may be defined.

In this step, if the terminal receives the backhaul link channel shield parameter broadcast by the relay node, the terminal may use the parameter and the access link channel shield amount (the terminal can be used to measure the access link of the RN) The value indicates that the measured value may be RSRP or RSRQ), and the cell selection metric value of the RN is recalculated, and then the cell selection is performed.

Specifically, the backhaul link channel shield parameter is a reference signal receiving shield RSRQ1 of the back link channel, and the access link channel shield is represented by a reference signal receiving shield RSRQ2 of the access link channel. The cell selection metric value RSRQ3 corresponding to the relay node may be determined by the following formula:

RSRQ3 = f(RSRQl, RSRQ2) Preferably, the minimum value of the reference signal receiving shield of the access link channel and the reference signal receiving shield of the backhaul link channel may be determined as corresponding to the relay node. Cell selection metric.

Certainly, if the terminal does not receive the backhaul link channel shield parameter broadcast by the relay node, the cell selection for selecting the RN may be calculated according to an existing method, such as directly using the RSRP of the access link of the RN. metric. Step 203: The terminal selects a cell.

In this step, the manner in which the terminal selects the cell is similar to the manner in which the terminal selects the cell according to the access link channel shield and the direct link channel shield. In particular, the terminal may select the corresponding cell. The donor base station or relay node with the largest metric is determined to be the selected cell.

The solution of the third embodiment of the present invention will be described below by way of a specific example.

Embodiment 4

FIG. 7 is a schematic diagram of a relay system and a cell selection provided in Embodiment 4, assuming that the backhaul link channel shield of RN1 is represented by RSRQ0, and the direct link channel shield of RUE1 directly connected to the DeNB is represented by RSRQ1. RUE1 The access link channel shield connected to RN1 is represented by RSRQ2, and RSRQ0<RSRQ1<RSRQ2, RSRQ1 and RSRQ2 can be directly measured by RUE1. Then, when RUE1 performs cell selection, the cell selection metric value of the RUE1 selecting RN may be RSRQ3 = min ( RSRQO, RSRQ2 ) (this means that when the terminal connects to the RN, its cell selection metric value is determined by the access link channel metric and The minimum value of the backhaul link channel shield is determined). In this way, the performance of the terminal when selecting different nodes (De B or RN ) can obtain a more matching estimate. For RUE1 in Figure 7, since RSRQ1>RSRQ3 at this time, RUE 1 will choose to connect to the DeNB, and according to the existing method, RUE1 will choose to connect to RN1, so the performance of RUE1 will be improved.

According to the solution provided by Embodiment 3 and Embodiment 4, the terminal may determine, according to the backhaul link channel shield parameter and the access link channel shield quantity, a cell selection metric value corresponding to the relay node, and select a metric according to the cell. The value and the direct link channel shield select the cell, which mainly improves the performance of the edge user between the RN and the DeNB, and also has the advantages of easy implementation.

The following systems and apparatuses are provided based on the same inventive concept as the first to fourth embodiments of the present invention.

Embodiment 5

The fifth embodiment of the present invention provides a cell selection system in a relay system. The structure of the system may be as shown in FIG. 8, including a relay node 11 and a terminal 12, where:

The relay node 11 is configured to send, to the terminal, information for determining a backhaul link channel metric; the terminal 12 is configured to measure an access link and a direct link, and determine an access link. The channel shield and the direct link channel shield, determine the backhaul link channel shield according to the information sent by the received relay node, and according to the access link channel shield, the backhaul link channel shield and the straight The cell selection is performed by connecting the link channel shield.

The relay node 11 is configured to determine an offset value according to the backhaul link channel shield quantity, and broadcast the offset value to the terminal, where the offset value is used for performing relay node coverage extension; Determining, according to the offset value, the access link channel shield quantity, a cell selection metric value corresponding to the relay node, determining a cell selection metric value corresponding to the host base station according to the direct link channel shield quantity, and using the corresponding cell The host base station or the relay node with the largest metric value is selected as the selected cell, and the cell selection metric value is used to indicate the probability that the terminal selects the cell.

The relay node 11 is configured to broadcast the backhaul link channel shield parameter to the terminal or return the link channel shield parameter The number is configured to the terminal by using the radio resource control RRC signaling; the terminal 12 is specifically configured to determine, according to the backhaul link channel shield parameter and the access link channel shield quantity, a cell selection metric value corresponding to the relay node. Determining a cell selection metric corresponding to the host base station according to the direct link channel shield quantity, and determining, as the selected cell, a host base station or a relay node with a corresponding cell selection metric value, where the cell selection metric value is used. Indicates the probability that the terminal selects the cell.

Embodiment 6

The sixth embodiment of the present invention provides a relay node, and the structure of the relay node may be as shown in FIG. 9 , including: the offset value determining module 21 is configured to determine an offset value according to a backhaul link channel shield, the offset The value is used to perform relay node coverage extension. The broadcast module 22 is configured to broadcast the offset value determined by the offset value determining module to the terminal, so that the terminal determines, according to the offset value and the access link channel shield. Determining a cell selection metric corresponding to the relay node, determining a cell selection metric corresponding to the host base station according to the direct link channel metric, and determining, as the selected base station or the relay node, the host node or the relay node having the largest cell selection metric value as the selected eNB The cell selection metric is used to indicate the probability that the terminal selects the cell.

The following formula determines the offset value Bias:

Utility of Backhaul indicates the return link channel shield parameter, and the argument is

Example VII.

The seventh embodiment of the present invention provides a relay node. The structure of the relay node may be as shown in FIG. 10, including: the parameter determining module 31 is configured to determine a backhaul link channel shield parameter; and the configuration module 32 is configured to use wireless The resource control RRC signaling configures a backhaul link channel shield parameter, so that the terminal determines a cell selection metric value corresponding to the relay node according to the backhaul link channel shield parameter and the access link channel shield quantity, Determining, according to the direct link channel shield quantity, a cell selection metric value corresponding to the host base station, where the cell selection metric value is used to indicate a probability that the terminal selects the cell, and the host cell or the relay node with the largest cell selection metric value is the largest. Determined as the selected cell.

Example VIII.

The eighth embodiment of the present invention provides a terminal. The structure of the terminal can be as shown in FIG.

The determining module 41 is configured to measure the access link and the direct link, determine the access link channel shield and the direct link channel shield, and determine the return chain according to the information sent by the received relay node. The channel channel shield quantity selection module 42 is configured to perform cell selection according to the access link channel shield quantity, the backhaul link channel shield quantity, and the direct link traffic channel shield quantity.

The determining module 41 is specifically configured to receive an offset value broadcast by the relay node, where the offset value is used for performing relay node coverage extension, where the offset value is determined by the relay node according to the backhaul link channel shield; 42 is specifically configured to determine, according to the offset value, the access link channel shield quantity received by the determining module, a cell selection metric value corresponding to the relay node, and determine a cell corresponding to the host base station according to the direct link channel channel metric. Selecting a metric value, and determining, as a selected cell, a host base station or a relay node with a corresponding cell selection metric value, where the cell selection metric value is used to indicate terminal selection The probability of the cell.

The determining module 41 is specifically configured to receive a backhaul link channel shield parameter broadcasted by the relay node or a backhaul link channel shield quantity parameter configured by the relay node by using the radio resource control RRC signaling; the selecting module 42 is specifically configured to be used according to the Determining a backhaul link channel shield parameter and an access link channel shield quantity to determine a cell selection metric value corresponding to the relay node, and determining a cell selection metric value corresponding to the host base station according to the direct link channel shield quantity, The cell selection metric is used to indicate the probability that the terminal selects the cell, and the host base station or the relay node with the largest cell selection metric value is determined as the selected cell.

The selecting module 42 is specifically configured to determine, by using the following formula, a cell selection metric value RSRQ3 corresponding to the relay node: RSRQ3 = f(RSRQ1, RSRQ2), where the backhaul link channel shield quantity parameter is a reference signal of the backhaul link channel Receiving the shield RSRQ1, the access link channel shield is represented by the reference signal receiving shield RSRQ2 of the access link channel.

The selecting module 42 is specifically configured to determine, as the cell selection metric value corresponding to the relay node, a minimum value of the reference signal receiving shield of the access link channel and the reference signal receiving shield of the backhaul link channel.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the application can be in the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can be in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory operable in a particular manner by a computer or other programmable data processing device, such that instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram. While the preferred embodiment of the present application has been described, those skilled in the art can make further changes and modifications to these embodiments once they are aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

Rights request

A cell selection method in a relay system, the method comprising:

The terminal performs cell selection according to the access link channel shield, the backhaul link channel shield, and the direct link channel shield.

The method of claim 1, wherein the receiving, by the terminal, the information returned by the relay node comprises: receiving, by the terminal, an offset value broadcast by the relay node, where the offset value is used for performing relay node coverage extension. The offset value is determined by the relay node according to the backhaul link channel shield;

The terminal performs cell selection according to the access link channel shield, the backhaul link channel shield, and the direct link channel shield, including:

The terminal determines, according to the offset value, the access link channel shield quantity, a cell selection metric value corresponding to the relay node, and determines a cell selection metric value corresponding to the host base station according to the direct link channel channel metric, and corresponding The host base station or the relay node with the largest cell selection metric is determined as the selected cell, and the cell selection metric is used to indicate the probability that the terminal selects the cell.

The method according to claim 2, wherein the relay node determines the offset value according to the backhaul link channel shield, and specifically includes determining the offset value Bias by using the following formula:

Bias = f (Quality of Backhaul)

Among them, Quality of Backhaul indicates that the link channel shield parameter is returned, and the function /0) whose quality variable is Quality of _ Backhaul is an increasing function.

4. The method of claim 3, wherein the offset value is a positive number, a zero or a negative number.

The method of claim 1, wherein the receiving, by the terminal, the information returned by the relay node comprises: receiving, by the terminal, a backhaul link channel shield parameter broadcast by the relay node or controlling the relay node by using radio resources Return link channel shield parameter configured by RRC signaling;

The terminal determines, according to the backhaul link channel shield parameter and the access link channel shield quantity, a cell selection metric value corresponding to the relay node, and determines a cell selection metric value corresponding to the host base station according to the direct link channel channel shield quantity. The cell selection metric is used to indicate a probability that the terminal selects the cell;

The terminal determines the host base station or the relay node with the corresponding cell selection metric value as the selected cell.

The method according to claim 5, wherein the terminal determines a cell selection metric value RSRQ3 corresponding to the relay node by using the following formula:

RSRQ3 = f(RSRQl, RSRQ2) where the backhaul link channel shield parameter is the reference signal receiving shield RSRQ1 of the backhaul link channel, and the access link The channel shield is represented by the reference signal receiving shield RSRQ2 of the access link channel.

The method according to claim 6, wherein the reference signal receiving shield of the access link channel and the minimum value of the reference signal receiving shield of the backhaul link channel are determined as the relay node. The corresponding cell selection metric.

A cell selection method in a relay system, the method comprising:

The relay node determines a backhaul link channel shield parameter;

A cell selection system in a relay system, characterized in that the system comprises a relay node and a terminal, wherein:

11. The system of claim 10, wherein:

The relay node is configured to determine an offset value according to the backhaul link channel shield quantity, and broadcast the offset value to the terminal, where the offset value is used for performing relay node coverage extension;

The terminal is specifically configured to determine, according to the offset value, an access link channel shield quantity, a cell selection metric value corresponding to the relay node, and determine a cell selection metric corresponding to the host base station according to the direct link channel shield quantity. And determining, by the host base station or the relay node that is the largest cell selection metric, the selected cell, where the cell selection metric is used to indicate the probability that the terminal selects the cell.

12. The system of claim 10, wherein:

The relay node is configured to broadcast the backhaul link channel shield parameter to the terminal or configure the backhaul link channel shield parameter to the terminal by using radio resource control RRC signaling;

The terminal is specifically configured to determine, according to the backhaul link channel shield parameter and the access link channel shield quantity Determining, according to the cell selection metric value corresponding to the node, determining a cell selection metric corresponding to the host base station according to the direct link channel metric, and determining, as the selected cell, the corresponding base station or relay node with the largest cell selection metric value, The cell selection metric is used to indicate the probability that the terminal selects the cell.

13. A relay node, wherein the relay node comprises:

The relay node according to claim 13, wherein the offset value determining module is specifically configured to pass the following

, Quality of Backhaul indicates the return link channel shield parameter, and the independent variable is

A relay node, wherein the relay node comprises:

a configuration module, configured to configure a backhaul link channel shield parameter by using radio resource control RRC signaling, so that the terminal determines the relay node according to the backhaul link channel shield parameter and the access link channel shield quantity Corresponding cell selection metric, determining a cell selection metric corresponding to the host base station according to the direct link channel metric, wherein the cell selection metric is used to indicate a probability that the terminal selects the cell, and the corresponding cell selection metric is maximized. The host base station or relay node is determined to be the selected cell.

A terminal, wherein the terminal comprises:

The terminal according to claim 16, wherein the determining module is configured to receive an offset value broadcast by the relay node, where the offset value is used for performing relay node coverage extension, where the offset value is The successor node is determined according to the backhaul link channel shield;

The selecting module is configured to determine, according to the offset value received by the determining module, the access link channel shield quantity, a cell selection metric value corresponding to the relay node, and determine, according to the direct link traffic shield quantity, the host base station corresponding a cell selection metric, and determining a host base station or a relay node with a corresponding cell selection metric value as the selected cell, The cell selection metric is used to indicate the probability that the terminal selects the cell.

The terminal according to claim 16, wherein the determining module is specifically configured to receive a backhaul link channel shield parameter broadcast by the relay node or a backhaul configured by the relay node by using radio resource control RRC signaling Link channel shield parameter;

The selecting module is specifically configured to determine, according to the backhaul link channel shield parameter and the access link channel shield quantity, a cell selection metric value corresponding to the relay node, and determine a host base station corresponding to the direct link channel channel shield quantity The cell selection metric is used to indicate the probability that the terminal selects the cell, and the host base station or the relay node with the largest cell selection metric value is determined as the selected cell.

The terminal according to claim 18, wherein the selecting module is specifically configured to determine, by using the following formula, a cell selection metric value RSRQ3 corresponding to the relay node:

RSRQ3 = f(RSRQl, RSRQ2) where the backhaul link channel shield parameter is the reference signal receiving shield RSRQ1 of the backhaul link channel, and the access link channel shield is used as the reference signal receiving shield of the access link channel. The quantity RSRQ2 is expressed.

The terminal according to claim 19, wherein the selecting module is specifically configured to determine a minimum value of a reference signal receiving shield of the reference signal receiving shield and the back link channel of the access link channel. A metric is selected for the cell corresponding to the relay node.