CN103260247A - Scheduling method, relay node and base station - Google Patents

Abstract

The invention provides a scheduling method, a relay node and a base station. The scheduling method comprises the steps that: the relay node receives a corresponding first CQI of each scheduling resource unit on a down link between the relay node and first UE, wherein each scheduling resource unit is served by the relay node and reported by the first UE, and figures a corresponding second CQI of each scheduling resource unit on a back link between the base station and the relay node; a corresponding equivalent CQI of every scheduling resource unit is obtained according to the corresponding first CQI and the second CQI of every scheduling resource unit; a target equivalent CQI is determined from all the equivalent CQIs and reported to the base station; the base station carries out resource scheduling on the first UE and second UE according to a corresponding third CQI of every scheduling resource unit which is directly served by the base station and reported by the second UE and the target equivalent CQI reported by the relay node. The problem of resource scheduling after a relay is introduced is solved.

Description

Scheduling method, relay node and base station

Technical Field

The present invention relates to communications technologies, and in particular, to a scheduling method, a relay node, and a base station.

Background

A third Generation Partnership Project (3 rd Generation Partnership Project, abbreviated as 3 GPP) Long Term Evolution (LTE) Project is comprehensively improved on the basis of a 3G system, so that on one hand, network performance is greatly improved, on the other hand, network parameters are complicated, a network structure is multi-layered, and challenges are brought to network operation and maintenance. In order to overcome multipath fading and improve spectrum utilization efficiency, the LTE system adopts a dynamic resource allocation mechanism, wherein a Medium Access Control (MAC) layer of an evolved node B (eNB) in the LTE system is responsible for managing resource scheduling of uplink and downlink channels.

As an evolution version of LTE, LTE-a introduces a relay technology into R10 to improve the coverage of the system, reduce the influence of shadow fading, and improve the Quality of experience (QoE for short) of edge users. Generally, one relay node can simultaneously cover a plurality of users, and the range covered by the relay node forms a relay cell. After the relay is introduced, an eNB in an original macro cell needs to schedule radio resources of the macro cell and a relay cell at the same time, but the existing method is only limited to direct transmission from the eNB to User Equipment (User Equipment, abbreviated as UE) and does not involve the scheduling problem of the UE in the relay cell, so a method is needed to solve the resource scheduling problem after the relay is introduced.

Disclosure of Invention

The invention provides a scheduling method, a relay node and a base station, which are used for solving the problem of resource scheduling after relay introduction.

A first aspect provides a scheduling method, including:

a relay node receives a first Channel Quality Indicator (CQI) corresponding to each scheduling resource unit reported by first User Equipment (UE) on a downlink between the relay node and the first UE, and calculates a second CQI corresponding to each scheduling resource unit on a return link between a base station and the relay node; wherein the first UE refers to a UE served by the relay node;

the relay node acquires an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit; the equivalent CQI corresponding to each scheduling resource unit is used for representing the quality of a downlink of the base station reaching the first UE through the relay node;

the relay node determines part of target equivalent CQI required to be fed back from equivalent CQI corresponding to all scheduling resource units corresponding to the first UE, and reports the target equivalent CQI to the base station;

the base station carries out resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node; wherein the second UE refers to a UE directly served by the base station.

A second aspect provides a relay node comprising:

a receiving module, configured to receive a first channel quality indicator CQI, which is reported by a first user equipment UE and corresponds to each scheduling resource unit on a downlink between the relay node and the first UE; wherein the first UE refers to a UE served by the relay node;

a calculating module, configured to calculate a second CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node;

an obtaining module, configured to obtain an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to a first CQI corresponding to each scheduling resource unit reported by the first UE and a calculated second CQI corresponding to each scheduling resource unit; the equivalent CQI corresponding to each scheduling resource unit is used for representing the quality of a downlink of the base station reaching the first UE through the relay node;

a determining module, configured to determine, from equivalent CQIs corresponding to all scheduling resource units corresponding to the first UE, a part of target equivalent CQIs to be fed back;

a sending module, configured to report the target equivalent CQI to the base station, so that the base station performs resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the sending module; wherein the second UE refers to a UE directly served by the base station.

A third aspect provides a base station comprising:

a receiving module, configured to receive a target equivalent channel quality indicator CQI reported by a relay node, and receive a third CQI corresponding to each scheduling resource unit reported by a second user equipment UE on a downlink between the base station and the second UE; wherein,

the target equivalent CQI is determined by the relay node from equivalent CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node, and the equivalent CQI corresponding to each scheduling resource unit on the backhaul link between the base station and the relay node is obtained by the relay node according to a first CQI corresponding to each scheduling resource unit reported by a first UE on a downlink between the relay node and the first UE and a second CQI corresponding to each scheduling resource unit calculated by the relay node on the backhaul link between the base station and the relay node, and is used for representing the quality of the downlink from the base station to the first UE through the relay node; the first UE is a UE served by the relay node, and the second UE is a UE directly served by the base station;

and a scheduling module, configured to perform resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node.

In the scheme provided by the embodiment of the invention, the relay node calculates the equivalent CQI representing the quality of the downlink from the base station to the UE through the relay node according to the CQI corresponding to each scheduling resource unit reported by the UE provided with service on the downlink between the relay node and the UE and the CQI corresponding to each scheduling resource unit calculated by the relay node on the return link between the base station and the relay node, and the relay node reports the calculated equivalent CQI corresponding to a part of scheduling resource units to the base station; the base station carries out resource scheduling on the UE which is directly served by the relay node and the UE which is directly served by the base station according to the equivalent CQI corresponding to the part of scheduling resource units reported by the relay node and the CQI corresponding to each scheduling resource reported by the UE which is directly served by the base station on a downlink between the base station and the UEs, provides a resource scheduling method considering the quality condition of a return link from the relay node to the base station, and solves the problem of resource scheduling after the introduction of the relay.

Drawings

Fig. 1 is a flowchart of a scheduling method according to an embodiment of the present invention;

FIG. 2 is a flowchart of an embodiment of step 104 according to the present invention;

fig. 3 is a schematic structural diagram of a relay node according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another base station according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a flowchart of a scheduling method according to an embodiment of the present invention. As shown in fig. 1, the method includes:

101. the relay node receives a first Channel Quality Indicator (CQI) corresponding to each scheduling resource unit reported by a first UE on a downlink between the relay node and the first UE, and calculates a second CQI corresponding to each scheduling resource unit on a backhaul link between a base station and the relay node.

Wherein the first UE refers to a UE served by the relay node. The first UE may be one or more.

For each first UE, calculating CQI corresponding to scheduling resource units which can be scheduled by the first UE on a downlink between the relay node and the first UE, and reporting the calculated CQI corresponding to each scheduling resource unit which can be scheduled by the first UE to the relay node. For each first UE, it is generally considered that all resource scheduling units in the entire cell can be scheduled, and therefore, the first UE calculates a CQI corresponding to a scheduling resource unit available for scheduling by the first UE on a downlink between the relay node and the first UE, that is, calculates a CQI corresponding to each scheduling resource unit on the downlink between the relay node and the first UE.

Optionally, the first UE may be according to a formula

Calculating a CQI corresponding to a scheduling resource unit on a downlink between the relay node and the first UE; wherein,

indicating the CQI corresponding to the scheduling resource unit b calculated by the first UE, wherein the value of b is 1, …,N_RB，N_RBRepresenting the total number of scheduling resource units in the whole cell; SINR_U1,bRepresenting the signal-to-interference-and-noise ratio of the scheduling resource unit b on the downlink between the relay node and the first UE; p_sRepresenting the transmit power of the base station. The first UE may obtain, through a Cell Reference Signal (CRS), a Signal-to-interference-and-noise ratio (sinr) of each scheduling resource unit on a downlink between the relay node and the first UE. For convenience of distinguishing, the CQI reported by the UE is recorded as a first CQI, and the CQI calculated by the relay node is recorded as a second CQI.

In this embodiment, for the relay node, a second CQI corresponding to a scheduling resource unit that can be scheduled by the relay node on a backhaul link between the base station and the relay node is calculated. For the relay node, it usually considers that all resource scheduling units in the whole cell can be scheduled, therefore, the relay node calculates a second CQI corresponding to a scheduling resource unit for the relay node to schedule on a backhaul link between the base station and the relay node, that is, calculates a second CQI corresponding to each scheduling resource unit on the backhaul link between the base station and the relay node.

Alternatively, the relay node may be according to a formula

Calculating a second CQI corresponding to each scheduling resource unit on a return link between the base station and the relay node; wherein,

the value of the second CQI corresponding to the scheduling resource unit b calculated by the relay node is 1, …, N_RB，N_RBRepresenting the total number of scheduling resource units in the whole cell; SINR_r,bIndicating the signal-to-interference-and-noise ratio of the scheduling resource unit b on the backhaul link between the relay node and the base station.

102. And the relay node acquires the equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit.

In this embodiment, since the equivalent CQI corresponding to each scheduling resource unit simultaneously considers the quality of the backhaul link between the base station and the relay node and the quality of the downlink between the relay node and the first UE, it can be used to characterize the quality of the downlink from the base station to the first UE via the relay node.

The present embodiment provides an alternative implementation of step 102, but is not limited thereto. Alternative embodiments of step 102 include: and the relay node compares the first CQI corresponding to each scheduling resource unit reported by the first UE with the calculated second CQI corresponding to each scheduling resource unit to obtain the smaller equivalent CQI which is corresponding to each scheduling resource unit corresponding to the first UE. For example, the relay node may be based on a formula ${\mathrm{\γ}}_{U_1,b}=\min \{{\widetilde{\mathrm{\γ}}}_{U_1,b},{\widetilde{\mathrm{\γ}}}_{U_1,b}\},$ And selecting the smaller of the first CQI and the second CQI corresponding to each scheduling resource unit as an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE. When a plurality of first UEs are provided, the equivalent CQI processes corresponding to each scheduling resource unit corresponding to each first UE are the same.

In addition to the foregoing embodiments, the relay node may also use an average value of the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit as an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE. In addition, the relay node may perform other numerical processing on the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit, and use a processing result as an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE.

103. And the relay node determines part of target equivalent CQI required to be fed back from the equivalent CQI corresponding to all scheduling resource units corresponding to the first UE, and reports the target equivalent CQI to the base station.

In this embodiment, after the relay node calculates the equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE, it determines a part of equivalent CQIs that need to be fed back, that is, a target equivalent CQI, and then reports the determined target equivalent CQI to the base station, instead of reporting all equivalent CQIs corresponding to scheduling resource units to the base station, which is beneficial to saving uplink transmission resources of a backhaul link.

Optionally, the relay node may determine part of equivalent CQIs to be fed back from all equivalent CQIs according to CQI feedback mechanisms of three granularities specified in the existing LTE standard, that is, a wideband, a subband selected by the UE, and a subband configured in an upper layer.

In addition to the foregoing manner, this embodiment further provides an optional implementation manner of determining a target equivalent CQI that needs to be fed back partially, including: the relay node determines the number of the target equivalent CQI needing to be fed back according to the number of the first UE and the expected interruption probability on a single scheduling resource unit; and then, the relay node selects the maximum equivalent CQI from the equivalent CQIs corresponding to all the resource scheduling units corresponding to the first UE according to the determined number, and the maximum equivalent CQI is used as the target equivalent CQI. Wherein the number of the first UE is alsoIs the number of UEs served by the relay node. For example, the relay node may be based on a formula

And determining the number of the target equivalent CQI needing to be fed back. Wherein,

the expression is the smallest integer of all integers which are more than or equal to x; n is a radical of_FBThe determined number; p_outIs the expected outage probability; k₂Representing a number of the first UEs; n is a radical of_RBRepresenting the total number of scheduling resource units.

It is noted that, through the foregoing steps, for each first UE, the set of CQIs on the downlink between the relay node and the first UE may be recorded asFor one downlink or one first UE, the target equivalent CQI selectively fed back by the relay node can form the CQI_U1,0A subset of (1), i.e. ${\mathrm{CQI}}_{U\mathrm{1,1}}\⋐{\mathrm{CQI}}_{U\mathrm{1,0}\·}$ The CQI subset CQI_U1,1Is satisfied with respect to $\∀a\∈{\mathrm{CQI}}_{U\mathrm{1,1}},\∀b\∈{\mathrm{CQI}}_{U\mathrm{1,2}},$ a is more than or equal to b, wherein CQI_U1,2＝CQI_U1,0-CQI_U1,1. In thatThat is, if there are a plurality of first UEs, the relay node obtains a plurality of CQI subsets, and reports the CQI subset corresponding to each first UE to the base station.

104. The base station carries out resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node; wherein the second UE refers to a UE directly served by the base station.

It should be noted that the scheduling resource unit in the embodiment of the present invention may be a Resource Block (RB), but is not limited to this, and may also be, for example, a wideband defined in the existing LTE standard, a subband selected by the UE, and a granularity of a subband configured in an upper layer. The selection of the granularity of the resource scheduling unit can be determined by the requirement of the network on the CQI precision.

As can be seen from the above, in this embodiment, the relay node calculates, according to the CQI, corresponding to each scheduling resource unit reported by the UE that is served by the relay node, on the downlink between the relay node and the UEs and the CQI, calculated by the relay node, corresponding to each scheduling resource unit on the backhaul between the base station and the relay node, an equivalent CQI representing the quality of the downlink from the base station to the UEs through the relay node, and the relay node reports the calculated equivalent CQI corresponding to a part of the scheduling resource units to the base station; the base station carries out resource scheduling on the UE which is directly served by the relay node and the UE which is directly served by the base station according to the equivalent CQI corresponding to a part of scheduling resource units reported by the relay node and the CQI corresponding to each scheduling resource reported by the UE which is directly served by the base station on a downlink between the base station and the UEs, provides a resource scheduling method considering the quality condition of a return link from the relay node to the base station, solves the problem of resource scheduling after the introduction of the relay, enables the base station to effectively schedule resources of a relay cell, is beneficial to improving the throughput of a network, enables the relay node to effectively provide services for the UE in the range of the relay node, and is beneficial to improving the edge user experience.

As shown in fig. 2, an alternative implementation of step 104 is provided in an embodiment of the present invention, which includes:

1041. and the base station determines the number of scheduling resource units used for the first UE and the number of scheduling resource units used for the second UE in all scheduling resource units according to the number of the first UE and the number of the second UE.

Wherein the total number of UEs within the whole cell, the number of UEs served by the relay node (i.e. the number of first UEs) and the number of UEs directly served by the base station (i.e. the number of second UEs) are known to the base station.

Currently, two implementations of relay technology include: in-band implementations (inband) and out-of-band implementations (outband). The in-band implementation means that an access link between the relay node and the UE which is served by the relay node and a return link between the base station and the relay node share a frequency point; the out-of-band implementation means that an access link between the relay node and the UE served by the relay node and a backhaul link between the base station and the relay node occupy different frequency points respectively. The method provided by the embodiment of the invention is suitable for in-band implementation and out-of-band implementation.

For the in-band type relay node, an optional implementation manner of step 1041 is: the base station according to the formula $N_2=\frac{K_2}{K}\frac{\mathrm{SF}}{S{F}_b},$ Determining the number of scheduling resource units for the first UE in all scheduling resource units; then, the base station subtracts the determined number of the scheduling resource units for the first UE from the total number of the scheduling resource units for the base station to obtain all scheduling resourcesA number of scheduling resource units for the second UE in a source unit.

For the out-of-band type relay node, an optional implementation manner of step 1041 is: the base station according to the formula $N_2=\frac{K_2}{K}\frac{\mathrm{\ω}}{{\mathrm{\ω}}_b},$ Determining the number of scheduling resource units for the first UE in all scheduling resource units; then, the base station subtracts the determined number of the scheduling resource units for the first UE from the total number of the scheduling resource units to obtain the number of the scheduling resource units for the second UE in all the scheduling resource units.

In the above formula, N₂Means for determining a number of scheduling resource units for the first UE; k₂Representing a number of the first UEs; k represents the sum of the number of the first UEs and the number of the second UEs; SF denotes the total number of subframes in the entire cell; SF_bRepresenting a number of subframes available for use by the relay node; omega represents the total number of frequency points in the whole cell; omega_bRepresenting the number of frequency points available for use by the relay node.

1042. And the base station determines the scheduling resource units for the first UE and the scheduling resource units for the second UE according to the determined number of the scheduling resource units for the first UE, the determined number of the scheduling resource units for the second UE, the third CQI corresponding to each scheduling resource unit reported by the second UE and the target equivalent CQI reported by the relay node, schedules the first UE on the determined scheduling resource units for the first UE, and schedules the second UE on the determined scheduling resource units for the second UE.

It should be noted that, there may be many ways for the base station to determine the scheduling resource units for the first UE and the scheduling resource units for the second UE according to the determined number of scheduling resource units for the first UE, the determined number of scheduling resource units for the second UE, the third CQI corresponding to each scheduling resource unit reported by the second UE, and the target equivalent CQI reported by the relay node.

This embodiment presents an alternative implementation of step 1042, which includes:

and the base station sets the CQI corresponding to the scheduling resource unit of the equivalent CQI which is not reported by the relay node to be 0. For each scheduling resource unit, a CQI set is associated, and the associated CQI set includes: a third CQI corresponding to the scheduling resource unit reported by each second UE and a CQI corresponding to each first UE; if the relay node does not report the equivalent CQI corresponding to the scheduling resource unit, the CQI corresponding to each first UE is 0, and if the relay node reports the equivalent CQI corresponding to the scheduling resource unit, the CQI corresponding to each first UE is the equivalent CQI corresponding to the scheduling resource unit reported by the relay node.

Then, the base station carries out scheduling on each scheduling resource unit in sequence according to the sequence of the scheduling resource units. The maximum CQI in the current scheduling resource unit is obtained, and whether the maximum CQI is reported by the relay equipment or not is judged.

If the maximum CQI is reported by the relay device according to the judgment result, when the number of the scheduling resource units allocated to the first UE by the base station does not reach the determined number of the scheduling resources for the first UE, allocating the current scheduling resource unit to the first UE corresponding to the maximum CQI, scheduling the first UE corresponding to the maximum CQI on the current scheduling resource unit, and when the number of the scheduling resource units allocated to the first UE by the base station reaches the determined number of the resource units for the first UE, allocating the maximum CQI to the first UEAnd setting the CQI to be 0, and returning to execute the maximum CQI on the current scheduling resource unit and subsequent operations. That is, if the maximum CQI in the CQI set of the current scheduling resource unit is the equivalent CQI reported by the relay node, that is, the maximum CQI corresponds to a certain first UE, if the number i of scheduling resource units allocated to the first UE served by the relay node (or allocated to the relay cell formed by the relay node) is smaller than N at this time₂Then, the maximum CQI is allocated to the relay cell and to the first UE corresponding to the maximum CQI; if the number i of the resource scheduling units allocated to the relay cell is larger than or equal to N₂Setting the maximum CQI to be 0, reselecting the maximum CQI from the CQI set of the current scheduling resource unit, continuously judging whether the reselected maximum CQI is reported by the relay equipment, and if so, continuously operating according to the above process until the scheduling resource unit is allocated.

If the maximum CQI is not reported by the relay equipment, when the number of scheduling resource units allocated to the second UE by the base station does not reach the determined number of scheduling resources for the second UE, allocating the current scheduling resource unit to the second UE corresponding to the maximum CQI, scheduling the second UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the second UE by the base station reaches the determined number of resource units for the second UE, setting the maximum CQI to 0, and returning to execute acquiring the maximum CQI on the current scheduling resource unit and subsequent operations. That is, if the maximum CQI in the CQI set of the current scheduling resource unit is not the equivalent CQI reported by the relay node, that is, the maximum CQI is reported by a second UE, that is, the maximum CQI corresponds to the second UE, and if the number j of scheduling resource units allocated to the second UEs served by the base station (or to the macro cell formed by the base station) is smaller than N at this time₁Then, the maximum CQI is allocated to the macro cell and to a second UE corresponding to the maximum CQI; if the resource scheduling unit allocated to the relay cell at the momentThe number j of is greater than or equal to N₁Setting the maximum CQI to be 0, reselecting the maximum CQI from the CQI set of the current scheduling resource unit, continuously judging whether the reselected maximum CQI is reported by the relay equipment, and if not, continuously operating according to the above process until the scheduling resource unit is allocated.

In the scheduling method provided in this optional embodiment, the base station allocates resources to the second UE directly served by the base station and the first UE directly served by the relay node according to the partial equivalent CQI of each first UE reported by the relay node and the third CQI reported by the second UE, and the base station may directly allocate resources to the user providing the maximum CQI according to the CQI of different UEs in each scheduling resource unit and schedule the user providing the maximum CQI, which may not only achieve fair scheduling of the second UE and the first UE, but also maximize throughput of the cell.

Fig. 3 is a schematic structural diagram of a relay node according to an embodiment of the present invention. As shown in fig. 3, the relay node includes: a receiving module 31, a calculating module 32, an obtaining module 33, a determining module 34 and a sending module 35.

A receiving module 31, configured to receive a first CQI, which is reported by a first UE and corresponds to each scheduling resource unit on a downlink between the relay node and the first UE; wherein the first UE refers to a UE served by the relay node.

A calculating module 32, configured to calculate a second CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node.

An obtaining module 33, connected to the receiving module 31 and the calculating module 32, configured to obtain, according to a first CQI corresponding to each scheduling resource unit reported by the first UE and a second CQI corresponding to each calculated scheduling resource unit, an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE; and the equivalent CQI corresponding to each scheduling resource unit is used for representing the quality of a downlink of the base station reaching the first UE through the relay node.

A determining module 34, connected to the obtaining module 33, configured to determine, from the equivalent CQIs corresponding to all scheduling resource units corresponding to the first UE and obtained by the obtaining module 33, part of target equivalent CQIs that need to be fed back.

A sending module 35, connected to the determining module 34, configured to report the target equivalent CQI determined by the determining module 34 to the base station, so that the base station performs resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the sending module 35; wherein the second UE refers to a UE directly served by the base station.

In an optional embodiment, the obtaining module 33 is specifically configured to compare a first CQI corresponding to each scheduling resource unit reported by the first UE with the calculated second CQI corresponding to each scheduling resource unit, and obtain a smaller equivalent CQI as an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE.

In an optional embodiment, the determining module 34 is specifically configured to determine, according to the number of the first UEs and the expected outage probability in a single scheduling resource unit, the number of the target equivalent CQIs that need to be fed back, and according to the determined number, select the largest equivalent CQI from the equivalent CQIs corresponding to all resource scheduling units corresponding to the first UE, as the target equivalent CQI.

Further optionally, the determination module 34 is specifically operable to determine the value of the equationAnd determining the number of the target equivalent CQI needing to be fed back, and selecting the maximum equivalent CQI from the equivalent CQIs corresponding to all resource scheduling units according to the determined number to be used as the target equivalent CQI.

Wherein,the expression is the smallest integer of all integers which are more than or equal to x; n is a radical of_FBThe determined number; p_outIs the expected outage probability; k₂Representing a number of the first UEs; n is a radical of_RBRepresents the total number of the scheduling resource units.

It is noted that the scheduling resource unit in this embodiment may be an RB, but is not limited to this, and may also be, for example, a wideband defined in the existing LTE standard, a granularity of a sub-band selected by a UE, and a granularity of a sub-band configured by an upper layer. The selection of the granularity of the resource scheduling unit can be determined by the requirement of the network on the CQI precision.

Each functional module of the relay node provided in this embodiment may be configured to execute the process of the method embodiment shown in fig. 1, and specific working principles thereof are not described again, for details, see description of the method embodiment.

The relay node provided in this embodiment may calculate, according to a CQI corresponding to each scheduling resource unit reported by the UE that is served by the relay node on a downlink between the relay node and the UEs and a CQI corresponding to each scheduling resource unit calculated by the relay node on a backhaul link between the base station and the relay node, an equivalent CQI representing quality of a downlink from the base station to the UEs through the relay node, and the relay node reports the calculated equivalent CQI corresponding to a part of the scheduling resource units to the base station, so that the base station may perform resource scheduling on the UEs that are served by the relay node and the UEs that are directly served by the base station according to the equivalent CQI corresponding to the part of the scheduling resource units reported by the relay node and the CQI corresponding to each scheduling resource unit reported by the UEs that are directly served by the base station on the downlink between the base station and the UEs, the resource scheduling method considering the quality condition of the return link from the relay node to the base station can be realized, the problem of resource scheduling after the relay is introduced is solved, the base station can effectively schedule the resources of the relay cell, the throughput of the network is favorably improved, in addition, the relay node can effectively provide services for the UE in the range of the relay node, and the edge user experience is favorably improved.

Fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 4, the base station includes: a receiving module 41 and a scheduling module 42.

A receiving module 41, configured to receive a target equivalent CQI reported by a relay node, and receive a third CQI, which is reported by a second UE and corresponds to each scheduling resource unit on a downlink between the base station and the second UE.

Wherein the target equivalent CQI is determined by the relay node from equivalent CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node; the equivalent CQI corresponding to each scheduling resource unit on the backhaul link between the base station and the relay node is obtained by the relay node according to a first CQI corresponding to each scheduling resource unit reported by a first UE on the downlink between the relay node and the first UE and a second CQI corresponding to each scheduling resource unit calculated by the relay node on the backhaul link between the base station and the relay node, and is used for representing the quality of the downlink from the base station to the first UE through the relay node; the first UE is a UE served by the relay node, and the second UE is a UE directly served by the base station.

A scheduling module 42, connected to the receiving module 41, configured to perform resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node, where the third CQI is received by the receiving module 41.

In an alternative embodiment, as shown in fig. 5, the scheduling module 42 includes: a number determination unit 421 and a scheduling unit 422.

A number determining unit 421, configured to determine, according to the number of the first UEs and the number of the second UEs, the number of the scheduling resource units for the first UE and the number of the scheduling resource units for the second UE in all scheduling resource units.

Further optionally, the number determination unit 421 may be specifically configured to determine the number according to a formula

Or a formula $N_2=\frac{K_2}{K}\frac{\mathrm{\ω}}{{\mathrm{\ω}}_b},$ Determining the number of scheduling resource units for the first UE in all scheduling resource units, and subtracting the determined number of scheduling resource units for the first UE from the total number of scheduling resource units to obtain the number of scheduling resource units for the second UE in all scheduling resource units. Wherein N is₂Means for determining a number of scheduling resource units for the first UE; k₂Representing a number of the first UEs; k represents the sum of the number of the first UEs and the number of the second UEs; SF represents the total number of subframes; SF_bRepresenting a number of subframes available for use by the relay node; omega represents the total number of frequency points; omega_bRepresenting the number of frequency points available for use by the relay node.

A scheduling unit 422, connected to the number determining unit 421 and the receiving module 41, configured to determine a scheduling resource unit for the first UE and a scheduling resource unit for the second UE according to the number of scheduling resource units for the first UE determined by the number determining unit 421, the number of scheduling resource units for the second UE determined by the number determining unit 421, a third CQI corresponding to each scheduling resource unit reported by the second UE and received by the receiving module 41, and the target equivalent CQI reported by the relay node, schedule the first UE on the determined scheduling resource unit for the first UE, and schedule the second UE on the determined scheduling resource unit for the second UE.

Further optionally, the scheduling unit 422 may be specifically configured to set a CQI corresponding to a scheduling resource unit of the equivalent CQI not reported by the relay node to 0, and schedule on each scheduling resource unit in sequence according to the sequence of the scheduling resource units;

for the current scheduling resource unit, the scheduling unit 422 is specifically configured to obtain a maximum CQI in the current scheduling resource unit, and determine whether the maximum CQI is reported by the relay device;

if the judgment result is that the maximum CQI is reported by the relay equipment, when the number of scheduling resource units allocated to the first UE by the base station does not reach the determined number of scheduling resources for the first UE, allocating the current scheduling resource unit to the first UE corresponding to the maximum CQI, scheduling the first UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the first UE by the base station reaches the determined number of resource units for the first UE, setting the maximum CQI to 0, and returning to execute the acquisition of the maximum CQI on the current scheduling resource unit and subsequent operations;

if the maximum CQI is not reported by the relay equipment, when the number of scheduling resource units allocated to the second UE by the base station does not reach the determined number of scheduling resources for the second UE, allocating the current scheduling resource unit to the second UE corresponding to the maximum CQI, scheduling the second UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the second UE by the base station reaches the determined number of resource units for the second UE, setting the maximum CQI to 0, and returning to execute acquiring the maximum CQI on the current scheduling resource unit and subsequent operations.

It is noted that the scheduling resource unit in this embodiment may be an RB, but is not limited to this, and may also be, for example, a wideband defined in the existing LTE standard, a granularity of a sub-band selected by a UE, and a granularity of a sub-band configured by an upper layer. The selection of the granularity of the resource scheduling unit can be determined by the requirement of the network on the CQI precision.

Each functional module of the base station provided in this embodiment may be configured to execute the process of the method embodiment shown in fig. 1 and fig. 2, and specific working principles thereof are not described again, for details, see description of the method embodiment.

The base station provided in this embodiment receives the target equivalent CQI of the downlink quality between the relay node and the first UE served by the relay node and the backhaul link quality between the relay node and the base station, and the CQI corresponding to each resource scheduling unit on the downlink between the base station and the second UE, which is reported by the second UE directly served by the base station, and schedules the second UE directly served by the base station and the first UE served by the relay node based on the two CQI. Based on this, the base station of this embodiment can effectively schedule resources of the relay cell, which is beneficial to improving throughput of the network, and in addition, the relay node can also effectively provide services for UEs within its range, which is beneficial to improving edge user experience.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (18)

1. A method of scheduling, comprising:

a relay node receives a first Channel Quality Indicator (CQI) corresponding to each scheduling resource unit reported by first User Equipment (UE) on a downlink between the relay node and the first UE, and calculates a second CQI corresponding to each scheduling resource unit on a return link between a base station and the relay node; wherein the first UE refers to a UE served by the relay node;

the relay node acquires an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit; the equivalent CQI corresponding to each scheduling resource unit is used for representing the quality of a downlink of the base station reaching the first UE through the relay node;

the relay node determines part of target equivalent CQI required to be fed back from equivalent CQI corresponding to all scheduling resource units corresponding to the first UE, and reports the target equivalent CQI to the base station;

the base station carries out resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node; wherein the second UE refers to a UE directly served by the base station.

2. The scheduling method of claim 1, wherein the obtaining, by the relay node, an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to the first CQI corresponding to each scheduling resource unit reported by the first UE and the calculated second CQI corresponding to each scheduling resource unit comprises:

and the relay node compares the first CQI corresponding to each scheduling resource unit reported by the first UE with the calculated second CQI corresponding to each scheduling resource unit to obtain the smaller equivalent CQI which is corresponding to each scheduling resource unit corresponding to the first UE.

3. The scheduling method of claim 1, wherein the determining, by the relay node, a part of target equivalent CQIs to be fed back from equivalent CQIs corresponding to all scheduling resource units corresponding to the first UE comprises:

the relay node determines the number of the target equivalent CQI needing to be fed back according to the number of the first UE and the expected interruption probability on a single scheduling resource unit;

and the relay node selects the maximum equivalent CQI from the equivalent CQIs corresponding to all the resource scheduling units corresponding to the first UE according to the determined number, and takes the maximum equivalent CQI as the target equivalent CQI.

4. The scheduling method of claim 3, wherein the relay node determines the number of the target equivalent CQIs to be fed back according to the number of the first UEs and the expected outage probability in a single scheduling resource unit, and the determining comprises:

the relay node is according to a formula

Determining the number of the target equivalent CQI needing to be fed back;

wherein,

the expression is the smallest integer of all integers which are more than or equal to x;

N_FBthe determined number;

P_outis the expected outage probability;

K₂representing a number of the first UEs;

N_RBrepresenting the total number of scheduling resource units.

5. The scheduling method according to any one of claims 1 to 4, wherein the base station performs resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node, and the method includes:

the base station determines the number of scheduling resource units used for the first UE and the number of scheduling resource units used for the second UE in all scheduling resource units according to the number of the first UE and the number of the second UE;

and the base station determines scheduling resource units for the first UE and scheduling resource units for the second UE according to the determined number of the scheduling resource units for the first UE, the determined number of the scheduling resource units for the second UE, a third CQI corresponding to each scheduling resource unit reported by the second UE and the target equivalent CQI reported by the relay node, schedules the first UE on the determined scheduling resource units for the first UE, and schedules the second UE on the determined scheduling resource units for the second UE.

6. The scheduling method of claim 5, wherein the base station determines the number of the scheduling resource units for the first UE and the number of the scheduling resource units for the second UE in all the scheduling resource units according to the number of the first UEs and the number of the second UEs, and comprises:

said base station according to the formula $N_2=\frac{K_2}{K}\frac{\mathrm{SF}}{S{F}_b},$ Or a formula $N_2=\frac{K_2}{K}\frac{\mathrm{\ω}}{{\mathrm{\ω}}_b},$ Determining the number of scheduling resource units for the first UE in all scheduling resource units;

subtracting the determined number of the scheduling resource units for the first UE from the total number of the scheduling resource units for the base station to obtain the number of the scheduling resource units for the second UE in all the scheduling resource units;

wherein N is₂Means for determining a number of scheduling resource units for the first UE;

K₂representing a number of the first UEs;

k represents the sum of the number of the first UEs and the number of the second UEs;

SF represents the total number of subframes;

SF_brepresenting a number of subframes available for use by the relay node;

omega represents the total number of frequency points;

ω_brepresenting the number of frequency points available for use by the relay node.

7. The scheduling method of claim 5, wherein the base station determines the scheduled resource units for the first UE and the scheduled resource units for the second UE according to the determined number of the scheduled resource units for the first UE, the determined number of the scheduled resource units for the second UE, a third CQI corresponding to each scheduled resource unit reported by the second UE, and the target equivalent CQI reported by the relay node, and schedules the first UE on the determined scheduled resource units for the first UE and the second UE on the determined scheduled resource units for the second UE, comprising:

the base station sets the CQI corresponding to the scheduling resource unit of the equivalent CQI which is not reported by the relay node to be 0;

the base station carries out scheduling on each scheduling resource unit in sequence according to the sequence of the scheduling resource units; wherein,

for the current scheduling resource unit, acquiring the maximum CQI in the current scheduling resource unit, and judging whether the maximum CQI is reported by the relay equipment;

if the judgment result is that the maximum CQI is reported by the relay equipment, when the number of scheduling resource units allocated to the first UE by the base station does not reach the determined number of scheduling resources for the first UE, allocating the current scheduling resource unit to the first UE corresponding to the maximum CQI, scheduling the first UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the first UE by the base station reaches the determined number of resource units for the first UE, setting the maximum CQI to 0, and returning to execute the acquisition of the maximum CQI on the current scheduling resource unit and subsequent operations;

if the maximum CQI is not reported by the relay equipment, when the number of scheduling resource units allocated to the second UE by the base station does not reach the determined number of scheduling resources for the second UE, allocating the current scheduling resource unit to the second UE corresponding to the maximum CQI, scheduling the second UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the second UE by the base station reaches the determined number of resource units for the second UE, setting the maximum CQI to 0, and returning to execute acquiring the maximum CQI on the current scheduling resource unit and subsequent operations.

8. The scheduling method according to any of claims 1-4 wherein the scheduling resource units are resource blocks, RBs.

9. A relay node, comprising:

a receiving module, configured to receive a first channel quality indicator CQI, which is reported by a first user equipment UE and corresponds to each scheduling resource unit on a downlink between the relay node and the first UE; wherein the first UE refers to a UE served by the relay node;

a calculating module, configured to calculate a second CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node;

an obtaining module, configured to obtain an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE according to a first CQI corresponding to each scheduling resource unit reported by the first UE and a calculated second CQI corresponding to each scheduling resource unit; the equivalent CQI corresponding to each scheduling resource unit is used for representing the quality of a downlink of the base station reaching the first UE through the relay node;

a determining module, configured to determine, from equivalent CQIs corresponding to all scheduling resource units corresponding to the first UE, a part of target equivalent CQIs to be fed back;

a sending module, configured to report the target equivalent CQI to the base station, so that the base station performs resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the sending module; wherein the second UE refers to a UE directly served by the base station.

10. The relay node of claim 9, wherein the obtaining module is specifically configured to compare a first CQI corresponding to each scheduling resource unit reported by the first UE with the calculated second CQI corresponding to each scheduling resource unit, and obtain a smaller equivalent CQI as an equivalent CQI corresponding to each scheduling resource unit corresponding to the first UE.

11. The relay node according to claim 9 or 10, wherein the determining module is specifically configured to determine, according to the number of the first UEs and an expected outage probability in a single scheduling resource unit, the number of the target equivalent CQIs that need to be fed back, and select, according to the determined number, a maximum equivalent CQI from equivalent CQIs corresponding to all resource scheduling units corresponding to the first UE as the target equivalent CQI.

12. The relay node of claim 11, wherein the determining module is specifically configured to determine the relay node according to a formula

Determining the number of the target equivalent CQI needing to be fed back, and selecting the largest equivalent CQI from equivalent CQIs corresponding to all resource scheduling units according to the determined number to be used as the target equivalent CQI;

wherein,

the expression is the smallest integer of all integers which are more than or equal to x;

N_FBthe determined number;

P_outis the expected outage probability;

K₂representing a number of the first UEs;

N_RBrepresents the total number of the scheduling resource units.

13. The relay node according to claim 9 or 10, wherein the scheduling resource units are resource blocks, RBs.

14. A base station, comprising:

a receiving module, configured to receive a target equivalent channel quality indicator CQI reported by a relay node, and receive a third CQI corresponding to each scheduling resource unit reported by a second user equipment UE on a downlink between the base station and the second UE; wherein,

the target equivalent CQI is determined by the relay node from equivalent CQI corresponding to each scheduling resource unit on a backhaul link between the base station and the relay node, and the equivalent CQI corresponding to each scheduling resource unit on the backhaul link between the base station and the relay node is obtained by the relay node according to a first CQI corresponding to each scheduling resource unit reported by a first UE on a downlink between the relay node and the first UE and a second CQI corresponding to each scheduling resource unit calculated by the relay node on the backhaul link between the base station and the relay node, and is used for representing the quality of the downlink from the base station to the first UE through the relay node; the first UE is a UE served by the relay node, and the second UE is a UE directly served by the base station;

and a scheduling module, configured to perform resource scheduling on the first UE and the second UE according to a third CQI corresponding to each scheduling resource unit reported by the second UE on a downlink between the base station and the second UE and the target equivalent CQI reported by the relay node.

15. The base station of claim 14, wherein the scheduling module comprises:

a number determining unit, configured to determine, according to the number of the first UEs and the number of the second UEs, the number of scheduling resource units for the first UE and the number of scheduling resource units for the second UE in all scheduling resource units;

a scheduling unit, configured to determine scheduling resource units for the first UE and scheduling resource units for the second UE according to the determined number of scheduling resource units for the first UE, the determined number of scheduling resource units for the second UE, a third CQI corresponding to each scheduling resource unit reported by the second UE, and the target equivalent CQI reported by the relay node, schedule the first UE on the determined scheduling resource units for the first UE, and schedule the second UE on the determined scheduling resource units for the second UE.

16. The base station according to claim 15, wherein said number determining unit is specifically configured to determine the number according to a formula $N_2=\frac{K_2}{K}\frac{\mathrm{SF}}{S{F}_b},$ Or a formula $N_2=\frac{K_2}{K}\frac{\mathrm{\ω}}{{\mathrm{\ω}}_b},$ Determining the number of scheduling resource units for the first UE in all scheduling resource units, and subtracting the determined number of scheduling resource units for the first UE from the total number of scheduling resource units to obtain the number of scheduling resource units for the second UE in all scheduling resource units;

wherein N is₂Means for determining a number of scheduling resource units for the first UE;

K₂representing a number of the first UEs;

k represents the sum of the number of the first UEs and the number of the second UEs;

SF represents the total number of subframes;

SF_brepresenting a number of subframes available for use by the relay node;

omega represents the total number of frequency points;

ω_brepresenting the number of frequency points available for use by the relay node.

17. The base station of claim 15, wherein the scheduling unit is specifically configured to set a CQI corresponding to a scheduling resource unit for which the relay node does not report an equivalent CQI to 0, and schedule on each scheduling resource unit in sequence according to an order of the scheduling resource units; wherein,

for the current scheduling resource unit, the scheduling unit is specifically configured to obtain a maximum CQI in the current scheduling resource unit, and determine whether the maximum CQI is reported by the relay device;

if the judgment result is that the maximum CQI is reported by the relay equipment, when the number of scheduling resource units allocated to the first UE by the base station does not reach the determined number of scheduling resources for the first UE, allocating the current scheduling resource unit to the first UE corresponding to the maximum CQI, scheduling the first UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the first UE by the base station reaches the determined number of resource units for the first UE, setting the maximum CQI to 0, and returning to execute the acquisition of the maximum CQI on the current scheduling resource unit and subsequent operations;

if the maximum CQI is not reported by the relay equipment, when the number of scheduling resource units allocated to the second UE by the base station does not reach the determined number of scheduling resources for the second UE, allocating the current scheduling resource unit to the second UE corresponding to the maximum CQI, scheduling the second UE corresponding to the maximum CQI on the current scheduling resource unit, when the number of scheduling resource units allocated to the second UE by the base station reaches the determined number of resource units for the second UE, setting the maximum CQI to 0, and returning to execute acquiring the maximum CQI on the current scheduling resource unit and subsequent operations.

18. The base station according to any of claims 14-17, wherein said scheduling resource units are resource blocks, RBs.

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