WO2012006887A1

WO2012006887A1 - Resources allocation method and apparatus in orthogonal frequency division multiplexing system

Info

Publication number: WO2012006887A1
Application number: PCT/CN2011/073086
Authority: WO
Inventors: 费佩燕
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-15
Filing date: 2011-04-20
Publication date: 2012-01-19
Also published as: CN102340878A; CN102340878B

Abstract

A resources allocation method and apparatus in an orthogonal frequency division multiplexing system are provided in the present invention. The method comprises the following steps: in the optional resource block(RB) frequency band sets of the system bandwidth, allocating the RB frequency band with the highest frequency domain Signal to Interference plus Noise Ratio(SINR) value to be the RB resources allocation frequency band of the user equipment which is to be scheduled. The resources allocation method and apparatus in the orthogonal frequency division multiplexing system provided by the present invention enable resources allocation in MAC layer, therefore the drawback of the low spectrum efficiency of the OFDM system in the prior art can be overcome, and the reliability of data transmission can be improved.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a resource allocation method and apparatus in an Orthogonal Frequency Division Multiplexing (OFDM) system. BACKGROUND OF THE INVENTION In recent years, third-generation and fourth-generation (3G/4G) wireless mobile network communications have achieved rapid development and growth of geometric users, which has proposed a system for optimal resource allocation and high-interference cancellation techniques. Big challenges, especially for increasing system throughput and improving signal and data transmission reliability, because the performance of mobile communication systems is often affected by multipath fading, resulting in performance degradation and capacity limitations.

OFDM technology has been widely used in wireless mobile networks, for example, Worldwide Interoperability for Microwave Access (WiMAX) and Long-Term Evolution (LTE), but still There are many problems. For example, carrier frequency offset impairs channel carrier orthogonality, and inter-carrier interference makes mobile system performance worse. In addition, spatial correlation (Record Correlation) in 4G systems strongly impacts mobile systems. Upstream system performance. Therefore, resource optimization and full utilization and the technology are recommended to be applied in WiMAX and LTE systems to improve system performance. At present, only simple power allocation technology and channel-based information dissemination technology are applied to LTE and IEEE802.16e/802.16m, and the optimal or suboptimal power allocation scheme has not been applied due to high complexity and strict conditions. Go to the above system. Adaptive adjustment techniques for precoding and shaping and code modulation are used in the physical layer for resource optimization to improve throughput and data transmission link performance. In the communication system, there is also a popular scheme for improving system performance called Inter-Cell Interference Corporation (ICIC), which is used in the same frequency networking. , try to reduce the interference between adjacent cells. In carrying out the invention, the inventors have realized that the prior art has the following problems: Spectrum utilization efficiency in an OFDM system. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a resource allocation method and apparatus in an orthogonal frequency division multiplexing system to solve the problem of low spectrum utilization efficiency in the above OFDM system. According to an aspect of the present invention, a method for resource allocation in an orthogonal frequency division multiplexing system is provided, including: allocating a frequency domain signal to a interference plus noise ratio in a resource block RB frequency band set with a system bandwidth optional The RB band with the largest SINR value is the RB resource allocation band of the user equipment UE to be scheduled. In the technical solution, allocating an RB frequency band that satisfies the maximum frequency domain SINR value to the RB resource allocated frequency band of the UE to be scheduled includes: specifying a reference RB position in the RB frequency band set of the system bandwidth optional; the reference RB position according to the preset step size Sliding, recording the SINR value corresponding to the reference RB position in the system bandwidth; setting the RB frequency band with the largest SINR value corresponding to the reference RB position as the RB resource allocation frequency band of the UE to be scheduled. In the technical solution, the RB resource allocation frequency band of the to-be-scheduled UE to be scheduled at the cell edge is set to be: under the inter-cell interference cancellation technology ICIC condition, and the cell has a high-interference indication H//„ _ew edge resource There is overlap with the resources of the neighboring cell >ThresholdNeibHii; and the

^T GBR_CEU ≥ GBRThresholdCEU ^ The GBR status of the neighboring cell in the resource allocation band is

GBR: ≥ GBRThresholdNb, where: T _GBR (i, the guaranteed bit rate GBR of the UE(i) of the cell satisfies the state, and Γ _σββ ( ) =− indicates that the i-th cell edge UE is within a frame generation interval

GBR, throughput rate; ^G represents the sum of all services GBR of the i-th cell edge UE; GBRThresholdCEU indicates that the GBR of the edge UE of the cell meets the threshold; GBRThresholdNb indicates that the GBR of the neighboring cell edge UE satisfies the threshold; G^^" indicates the corresponding neighboring cell The GBR satisfies the state at the resource location; ThresholdNeiHii represents a threshold value of the sum of the neighboring high-interference indications. According to another aspect of the present invention, a device for resource allocation in an orthogonal frequency division multiplexing system is provided , including: a resource allocation module, set to a resource block RB band set that is optional in system bandwidth, The RB frequency band that satisfies the frequency domain signal and the interference plus noise ratio SINR value is allocated as the RB resource allocation frequency band of the user equipment UE to be scheduled. In the technical solution, the resource allocation module includes: a reference RB location sub-module, configured to specify a reference RB position in a system bandwidth optional RB band set; and a statistical sub-module configured to slide the reference RB position according to a preset step size The SINR value corresponding to the reference RB position in the system bandwidth is recorded; and the setting submodule is set to set the RB frequency band with the largest SINR value corresponding to the reference RB position as the RB resource allocation frequency band of the UE to be scheduled. The method further includes: a priority module, configured to perform scheduling priority processing on the newly transmitted UE, obtain a scheduling priority queue of the newly transmitted UE, and perform RB number allocation on the newly transmitted UE in the scheduling priority queue. The method further includes: an available RB band initial module, configured to retransmit the RB frequency band and the number of the UE, obtain the number of RBs and frequency bands available for the newly transmitted UE, and start from the first available RB frequency band to determine an optional resource block of the system bandwidth. RB band set. The method further includes: an edge UE resource allocation module, configured to set a RB resource allocation frequency band of the to-be-scheduled UE to be scheduled at a cell edge according to the following situation: under the inter-cell interference cancellation technology ICIC condition, and the cell has a high interference indicator HII Edge resources and neighboring cells: > ThresholdNeibHii resources overlap; and the GBR status of the neighboring cell in the RE resource allocation band is GBR: ≥ GBRThresholdNb, where: Γ _σ3⁄4? ( ) is the cell UE(i) The guaranteed bit rate GBR satisfies the state, and Γ _σββ ( ) = one ^, indicating the i-th cell edge UE

GBR, the throughput rate in a frame generation interval; ^G represents the sum of all services GBR of the i-th cell edge UE; GBRThresholdCEU indicates that the GBR of the edge UE of the cell meets the threshold;

GBRThresholdNb indicates that the GBR of the neighboring cell edge UE satisfies the threshold; ^GBR indicates that the GBR satisfies the state at the corresponding resource location of the neighboring cell; ThresholdNeiHii indicates a threshold value of the sum of the neighboring high-interference indications. The embodiment provides a resource allocation method and device in an orthogonal frequency division multiplexing system, so that a resource allocation method can be performed in the MAC layer, which overcomes the defect of low spectral efficiency in the OFDM system in the prior art, and improves data. The reliability of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a flow chart of a resource allocation method in an OFDM system according to an embodiment of the present invention; FIG. 2 is a flowchart of a resource allocation method in an OFDM system according to an embodiment of the present invention; 3 is a flowchart of a resource allocation method in an OFDM system under ICIC conditions according to Embodiment 3 of the present invention; FIG. 4 is a diagram showing a method for resource allocation in an OFDM system according to an embodiment of the present invention. The evasive algorithm performs a RB location allocation flowchart; FIG. 5 is a structural block diagram of a resource allocation apparatus in an OFDM system according to an embodiment of the apparatus of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In order to make the objects and technical solutions of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. Method Embodiment 1 FIG. 1 is a flowchart of a resource allocation method in an OFDM system according to Embodiment 1 of the present invention. As shown in FIG. 1 , the process includes the following steps: Step S102: In a resource block RB frequency band set that is optional in a system bandwidth, allocate an RB frequency band that satisfies a frequency domain signal and a maximum interference-to-noise ratio SINR value as a to-be-scheduled UE. RB resource allocation band. A flow for implementing the above method is further given below, but the present invention is not limited to the resource allocation by the method. The allocation of the RB frequency band that satisfies the maximum frequency domain SINR value to the RB resource allocated to the UE to be scheduled may specifically include: specifying a reference RB position in the RB frequency band set of the system bandwidth optional; the reference RB position sliding according to a preset step size, recording Corresponding to the reference RB position in the system bandwidth The SINR value, the sliding direction can be from low frequency to high frequency, and can also be from high frequency to low frequency; the RB frequency band with the largest SINR value corresponding to the reference RB position is set as the RB resource allocation frequency band of the UE to be scheduled. In this embodiment, the method for resource allocation in the MAC layer overcomes the defect of low spectral efficiency in the OFDM system in the prior art, and improves the reliability of data transmission. Method Embodiment 2: FIG. 2 is a flowchart of a resource allocation method in an OFDM system according to Embodiment 2 of the present invention. As shown in FIG. 2, the process includes the following steps: Step S202: Determine a number of RBs and a frequency band occupied by a retransmission UE and a retransmission UE in a cell. Step S204: Determine the current transmission by referring to the number of RBs and the frequency band of the retransmission UE. The number of RBs and frequency bands available for the new UE is transmitted. Step S206: Perform priority processing on all newly transmitted UEs in the cell to obtain a priority queue of the UE, and the priority processing methods are PF algorithm, MAXC/I algorithm, RR algorithm, etc. For the method of priority calculation, there is no limitation here; Step S208, the RB number allocation is performed for all scheduled new UEs, and the number of RBs of the newly transmitted UE is more divided, and can be equally divided according to The channel status is allocated, and can be allocated according to the service type. The RB number is not allocated. Therefore, in step S210, it is determined whether the UE is an edge UE. If yes, step S222 is performed. If not, step S212 is performed. Step S212, the new user is sent. The RB start position is allocated from the first assignable RB position, that is, the resource block RB band set that is optional for the system bandwidth starting from the first available RB band. Step S214: Starting from a starting position where the RB allocation is possible, finding an RB location set that is optional in the system bandwidth of the currently scheduled UE. Step S216: Specifying an RB location as the frequency in the RB bandwidth allocated by the UE. The selected reference point step S218, in the optional RB set, sliding from a low frequency to a high frequency according to a given step size, in the statistical system bandwidth, the SINR value corresponding to the reference RB Step S220: The RB frequency band with the largest SINR value corresponding to the reference RB is taken as the RB resource allocation position of the UE, and the process ends. Step S222: The RB position is allocated to the edge UE. For the cell edge UE, one of the following methods may be adopted: The frequency selection process shown in step 4 can be performed on S212 to S218; 2) one RB frequency band can be randomly selected as the RB resource band allocation, or the relative frequency or high frequency region can be fixed to allocate the RB resource band, End. The RB start position of the newly transmitted UE is allocated from the first assignable RB position, and starts from the start position where the RB allocation is possible, and finds an optional RB frequency band set of the current UE to be scheduled in the system bandwidth; The embodiment is a resource allocation method in an OFDM system without considering ICIC conditions. In this embodiment, the UE to be scheduled is divided into a retransmission UE and a new transmission UE. The retransmission UE and the area i in which the new UE is located may be the cell center or the cell edge. The retransmission UE refers to a UE that fails to receive data for the first time and performs data transmission again. The new UE refers to the UE that performs data transmission for the first time. In this embodiment, the method for resource allocation in the MAC layer overcomes the defect of low spectral efficiency in the OFDM system in the prior art, effectively reducing system interference and improving system throughput. Method Embodiment 3: Under the ICIC condition, it is necessary to consider the High Interference Indication (abbreviated as ΗΠ) information. The ΗΠ information is a strong interference indicator, indicating that the serving cell will schedule the UE at the edge of the cell on the indicated Physical Resource Block (PRB) (ie, it is easy to generate strong interference on these PRBs), and receive the ΗΠ The cell avoids scheduling cell edge UEs on these PRBs. The UI information contains information for each PRB over the entire system bandwidth. Preferably, the UI information includes PRB0 to PRB109. Wherein, "Γ" indicates that the strong thousand 4 is particularly sensitive, that is, the PRB is occupied by the cell edge UE, and the neighboring cell is likely to generate strong interference; "0" indicates a weak interference sensitive indication, that is, the PRB is not occupied by the cell edge UE. It is not easy to generate strong interference to the neighboring cell. Under the ICIC condition, the ΗΠ processing module outputs the sum of the high-interference indication (HII) of the cell and the high-interference indicator of the neighboring cell (H//:), and the cell edge UE is dedicated at the cell edge. When there is allocation on the frequency band, the resource allocation of the cell edge UE is performed by referring to the high interference indication information of the local area and the neighboring area. For the cell edge UE, that is, the neighboring cell also declares that the resource is occupied, and the overlap amount is greater than the preset threshold T, the GBR is satisfied according to the edge UE and the guaranteed bit rate of the neighboring cell edge ( Guaranteed Bit Rate, referred to as GBR ) satisfies the state to determine whether to occupy the resource. The specific method is as follows: If the T _{GBR CEU} ≥ GBRThresholdCEU of the local cell, and the GBR status of the neighboring cell on the resource is GBR: ≥ GBRThresholdNb, indicating that both parties satisfy the GBR, the edge UE tries to avoid occupying the resource, otherwise, the edge UE Occupy this resource. Where: Γ _σ3⁄4? ( ) is the GBR satisfaction state of UE(i) in the cell, and Γ _σββ ( ) = — ; indicates that the i-th cell edge UE is in

GBR, the throughput rate in the ΗΠ generation interval; indicates the GBR sum of all services of the i-th cell edge UE; GBRThresholdCEU indicates that the GBR of the edge UE of the cell meets the threshold; GBRThresholdNb indicates that the GBR of the neighboring cell edge UE satisfies the threshold; GBR indicates the neighboring cell The GBR at the corresponding resource location satisfies the state; ThresholdNeiHii represents a threshold value of the sum of the neighboring zone indications. FIG. 3 is a flow chart showing a method for resource allocation in an OFDM system under ICIC conditions according to Embodiment 3 of the method of the present invention. The majority of the processes in FIG. 3 are the same as the related processes in FIG. 2, and the difference is: Step S310, determining that the ICIC is enabled and is an edge UE, if the condition is met, performing the step

S322, if not, executing step S312; step S322, if the ICIC is enabled and is an edge UE, the edge UE is circumvented. In specific implementation, the UEs are classified into two types according to the location of the cell where the UE is located, and the following processing is performed. 1) For the cell center UE, the resource allocation is performed according to the method of the method embodiment 2;

2) FIG. 4 is a flow chart of the RB location allocation using the HII evasion algorithm under the ICIC condition according to the resource allocation method in the third OFDM system according to the method of the present invention. As shown in FIG. 4, the process includes the following steps: Step S402, determining that the cell has a high-interference indicator 边缘 edge resource and a neighboring cell

ΗΙΓ: > whether the resources of the ThresholdNeibHii overlap, that is, the neighboring cell also declares that the resource is occupied, and the overlap amount is greater than the threshold value T. If yes, step S404 is performed, if not, step S410 is performed; step S404, determining whether the current resource is present The user in the local cell and the neighboring cell meets the GBR, and if yes, the step 4 is performed, the S406 is performed, if not, the step 4 is performed. S410: Step S406, whether the user of the cell can avoid the resource, and if yes, step S408 is performed. If not, step S410 is performed; step S408, the user of the cell avoids the resource, and the process ends; in step S410, the start position RB of the current user-defined RB is the starting RB index of the consecutive RBs that meet the allocation, and the process ends. This embodiment is complementary to the method embodiments 1 and 2, and adds a technical solution for cell edge UE resource allocation under ICIC conditions. The method in this embodiment can effectively reduce system interference, improve system throughput, and improve edge UE throughput. At the same time, the method of the embodiment has low complexity under the ICIC off condition; under the ICIC open condition, the complexity is high, but the edge throughput rate can be effectively improved. Apparatus Embodiment 1: FIG. 5 is a structural block diagram of a resource allocation apparatus in an OFDM system according to an embodiment of the apparatus of the present invention. As shown in FIG. 5, the resource allocation apparatus in the OFDM system includes: a resource allocation module 502, configured to allocate, in a resource block RB frequency band set that is optional in a system bandwidth, an RB that satisfies a frequency domain signal and a maximum interference/noise ratio SINR value. The frequency band is a frequency band allocated to the RB resource of the user equipment UE to be scheduled. The method implemented in this embodiment can refer to the related descriptions of the method embodiments 1 to 3, and has all the beneficial effects of the foregoing embodiments, and is not repeated in J3⁄4. Device Embodiment 2: As shown in FIG. 5, in this embodiment, the resource allocation apparatus in the OFDM system may further include: a priority module 504, configured to perform scheduling priority processing on the newly transmitted UE, and obtain scheduling priority of the newly transmitted UE. The Queue is configured to perform RB number allocation on the newly transmitted UE in the scheduling priority queue. The available RB band initial module 506 is connected to the priority module 504 and the resource allocation module 502, and is configured to be configured by Retransmitting the RB frequency band and number of the UE, obtaining the number of RBs and frequency bands available for the newly transmitted UE, and starting the RB starting position of the newly transmitted UE from the first available RB frequency band, that is, determining from the first available RB frequency band , a set of resource block RB bands that are optional for system bandwidth. In addition, in this embodiment, the resource allocation module may include: a reference RB location sub-module, configured to specify a reference RB position in the RB frequency band set that is optional in the system bandwidth; and a statistical sub-module configured to preset the reference RB position according to the preset The step size is slid, and the SINR value corresponding to the reference RB position in the system bandwidth is recorded. The setting sub-module is set to set the RB frequency band with the largest SINR value corresponding to the reference RB position as the RB resource allocation frequency band of the UE to be scheduled. As shown in FIG. 5, in this embodiment, the resource allocation apparatus in the OFDM system may further include: an edge UE resource allocation module 508, configured to set a UE to be scheduled to be scheduled at a cell edge, except for the following situation:

RB resource allocation band: Under the ICIC condition, the cell has a high-interference indication H//„ _ew edge resources overlap with the resources of the neighboring cell> ThresholdNe plane i; and the T _{OBR CEU} ≥ GBRThresholdCEU of the cell, the neighboring cell The GBR status on the RB resource allocation band is GBR ≥ GBRThresholdNb. The method implemented in this embodiment can refer to the related description of the method embodiment 4, and has all the beneficial effects of the foregoing embodiment, and will not be repeated here. Those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device for execution by the computing device and, in some cases, may be performed in a different order than that illustrated herein. Steps out of or described, or separate them into individual integrated circuit modules, or multiple of them The blocks or steps are implemented as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only a preferred embodiment of the invention and is not intended to limit the invention, A person skilled in the art can make various changes and modifications to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention should be included in the scope of the present invention. Inside.

Claims

A method for resource allocation in an orthogonal frequency division multiplexing system, comprising:

In the resource bandwidth RB frequency band set that is optional in the system bandwidth, the RB frequency band that satisfies the frequency domain signal and the interference plus noise ratio SINR value is allocated as the RB resource allocation frequency band of the user equipment UE to be scheduled.

The method according to claim 1, wherein the allocating the RB frequency band that satisfies the maximum frequency domain SINR value to the RB resource allocated frequency of the UE to be scheduled includes:

Specifying a reference RB position in the RB band set of the system bandwidth optional; the reference RB position sliding according to a preset step size, and recording a SINR value corresponding to the reference RB position in the system bandwidth;

The RB frequency band with the largest SINR value corresponding to the reference RB position is set as the RB resource allocation frequency band of the UE to be scheduled.

The method according to claim 1, wherein the allocating the RB frequency band that satisfies the maximum frequency domain SINR value to the RB resource allocated frequency of the UE to be scheduled further includes:

Performing scheduling priority processing on the newly transmitted UE, and obtaining a scheduling priority queue of the newly transmitted UE;

And assigning an RB number to the newly transmitted UE in the scheduling priority queue.

4. The method according to claim 3, wherein

The scheduling priority processing includes: using a PF algorithm, a MAXC/I algorithm, or an RR algorithm for priority processing;

The RB number allocation includes: allocation according to channel conditions, allocation according to service type, or even distribution.

Obtaining the number of RBs and frequency bands available for the newly transmitted UE by retransmitting the RB frequency band and the number of the UE; Determining a set of resource block RB bands that are selectable for the system bandwidth starting from the first available RB band.

The method according to any one of claims 1-5, wherein, in addition to the following, the UE to be scheduled that sets the cell edge occupies the RB resource allocation frequency band:

Under the inter-cell interference cancellation technology (ICIC) condition, the edge resource of the high-interference indicator HII in the cell overlaps with the resource of the neighboring cell >ThresholdNeibHii; and the T _{G CEU} ≥ GBRThresholdCEU of the cell, and the neighboring cell in the RB resource The GBR status on the allocated frequency band is GBR: ≥ GBRThresholdNb, where: ^G _SR ') is the guaranteed bit rate GBR of the UE(i) of the cell satisfies the state, and

T _GBR (j) = ^ ; indicates that the i-th cell edge UE is swallowed within a frame generation interval

GBR, the spit rate; represents the sum of all services GBR of the i-th cell edge UE;

GBRThresholdCEU indicates that the GBR of the edge UE of the cell meets the threshold; GBRThresholdNb indicates that the GBR of the neighboring cell edge UE satisfies the threshold; GBR indicates that the GBR of the neighboring cell corresponds to the state of the GBR; ThresholdNeiHii indicates the sum of the neighboring zone high and high indications Threshold.

7. A device for resource allocation in an orthogonal frequency division multiplexing system, comprising:

The resource allocation module is configured to allocate, in the resource block RB band set that is optional in the system bandwidth, the RB frequency band that satisfies the frequency domain signal and the interference plus noise ratio SINR value is the RB resource allocation frequency band of the UE to be scheduled UE.

The device according to claim 7, wherein the resource allocation module comprises:

a reference RB location sub-module, configured to specify a reference RB location in the set of RB bands that are selectable in the system bandwidth;

a statistic sub-module, configured to slide the reference RB position according to a preset step size, and record a SINR value corresponding to the reference RB position in the system bandwidth;

The setting submodule is configured to set the RB frequency band with the largest SINR value corresponding to the reference RB position as the RB resource allocation frequency band of the UE to be scheduled.

The device according to claim 7, further comprising:

The priority module is configured to perform scheduling priority processing on the newly transmitted UE, obtain a scheduling priority queue of the newly transmitted UE, and perform RB number allocation on the newly transmitted UE in the scheduling priority queue.

10. The device according to claim 7, further comprising:

The RB band initial module is set to be the RB band and the number of the retransmitted UE, and the number of RBs and the frequency band available for the newly transmitted UE are obtained, and it is determined that the system bandwidth is optional from the first available RB band. Resource block RB band set.

The apparatus according to any one of claims 7 to 10, further comprising:

The edge UE resource allocation module is configured to set the cell edge to be scheduled by the to-be-scheduled UE to occupy the RB resource allocation frequency band: under the ICIC condition, the local cell has a high interference indicator indicating the edge resource of the HII and the neighboring cell: > ThresholdNeibHii resources overlap; and the T _{G CEU} ≥ GBRThresholdCEU of the cell, the GBR status of the neighboring cell in the RB resource allocation band is GBR: ≥ GBRThresholdNb, where: ^G _SR ') is the cell UE(i) Guaranteed bit rate GBR satisfies the state, and