CN102301822B - Mixing dual-mode determining method in wireless communication system and device - Google Patents

Mixing dual-mode determining method in wireless communication system and device Download PDF

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CN102301822B
CN102301822B CN200980155576.2A CN200980155576A CN102301822B CN 102301822 B CN102301822 B CN 102301822B CN 200980155576 A CN200980155576 A CN 200980155576A CN 102301822 B CN102301822 B CN 102301822B
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tdd
mode
fdd
traffic
dual
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CN102301822A (en
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金洛明
申秀贞
柳惠仁
姜海璘
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Industry Collaboration Foundation of Ewha University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/30—Special cell shapes, e.g. doughnuts or ring cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The present invention relates to the mixing dual-mode determining method in a kind of wireless communication system and device.The dual-mode of mixing dual-mode determining method in wireless communication system of the present invention in same community between base station with user terminal uses time division duplex (TDD) pattern or Frequency Division Duplexing (FDD) (FDD) pattern to communicate mutually, described community (Cell) is divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode, comprises the following steps: to obtain the positional information of user terminal and the traffic information between described user terminal and base station; And described user terminal is when the TDD line of demarcation as described TDD region and described FDD area limit line is moved, and determines the dual-mode of described user terminal according to described traffic characteristic.Described the present invention considers position information of user's terminal and traffic characteristic when wireless communication system determines dual-mode simultaneously, can use the FDD resource and TDD resource of distributing to community expeditiously.

Description

Mixing dual-mode determining method in wireless communication system and device
Technical field
The present invention relates to a kind of wireless communication system, particularly relate to a kind of use time division duplex and Frequency Division Duplexing (FDD) simultaneously mix dual-mode determining method and device.
Background technology
The target of new generation of wireless communication system is the various multimedia services in the traffic with feature such as support voice service, broadcast and real-time video meeting simultaneously.Therefore, in order to effectively provide these tools miscellaneous service, require to consider based on service feature asymmetry and continuity duplex (duplexing) mode of up and downlink transmission.
The duplex mode that wireless communication system uses can be divided into time division duplex (Time DivisionDuplexing:TDD) mode and Frequency Division Duplexing (FDD) (Frequency Division Duplexing:FDD) mode.Alternately switch (Switching) after identical frequency band is divided into the period by TDD mode transmit and collect mail the period, to realize two-way communication, distributed frequency band is divided into and transmits and frequency band of collecting mail by FDD mode, to realize two-way communication.
In the communication system based on TDD mode, base station can by the part or all of time slot allocation that can be used in time slot to having mobility and fixed user terminal, and by the variable allocation of such time slot, realize asymmetric communication.But; when the radius of society covered in base station based on the communication system of TDD mode becomes large; because round trip delay (Round Trip Delay) causes increasing the guard time (guard time) between transmitting-receiving letter time slot, thus reduce efficiency of transmission.Therefore, as macrocell (macro cell), the communication environment with larger radius of society is not suitable for using TDD.And the communication system based on TDD mode is not identical at the asymmetric ratio of multiple (Multi) cell environment Xia Ge community, between the user terminal being therefore in edge, abutting subdistrict, serious frequency interferences will be there is.
In addition, because the communication system based on FDD mode has been split for the frequency band transmitted with collect mail, therefore can not produce for the time delay transmitted or collect mail (Time delay).Therefore, round trip delay can not be produced because of time delay, therefore relatively be applicable to the cell environment with larger radius of society as macrocell.But, based on FDD mode communication system its transmit frequency band and collection of letters frequency band is fixing, be therefore not suitable for being used in the duplex mode taking variable asymmetric transmission.
Therefore, consider various communication environment and the traffic feature of a new generation, mixing duplex (Hybrid Duplexing) mode of the mixed two kinds of duplex modes of research, to obtain all advantages of TDD mode and FDD mode.
Fig. 1 is an example of the wireless communication system based on existing mixing duplex mode.As shown in the figure, community (Cell) is divided into inner region (inner zone) and outskirt (outer zone) according to line of demarcation, TDD is used at community inner region (TDD region), effectively to manage the asymmetric communication amount of down link and up link, use FDD, effectively to process the interference between community at community outskirt (FDD region) simultaneously.Therefore, the dual-mode of each intra-cell users terminal runs according to residing region, with fixing line of demarcation for benchmark, runs when being in community inner region in TDD mode, then runs in FDD mode when being in community outskirt.
Summary of the invention
Technical problem
In the described wireless communication system based on existing mixing duplex mode, with fixing line of demarcation for region, standard division of cells, and use TDD and FDD mode simultaneously, thus possess respective advantage.But, distinguish the dual-mode of user terminal based on fixing line of demarcation, only switch dual-mode according to oneself positional information at the user terminal of line of demarcation movement, therefore there is various problem.
Such as, when the user terminal run in TDD mode moves to FDD region by line of demarcation, will the feature as traffic asymmetry of this user terminal be ignored and be directly switch to FDD mode.But, shown in following mathematical expression, the TDD mode of each user terminal and the traffic holding method of FDD mode different, make downlink traffic size and uplink traffic difference in size larger, the user terminal with asymmetric communication amount is when running in FDD mode, will reduce resource availability further.
w k , FDD = 2 × max { w k up , w k down }
w k , TDD = w k up + w k down
At this,
W k, FDDwith w k, TDDthe traffic size that the traffic of a kth user terminal in FDD mode and TDD mode is occupied respectively, with the up link of a kth user and the actual traffic size of down link respectively.That is, TDD mode has nothing to do in the traffic difference in size of up, down link and asymmetrical Resources allocation, but the side Resources allocation symmetrically that FDD mode selects the traffic larger in downlink or uplink link.Therefore, during the larger terminal of FDD mode operational communications amount asymmetry, the poor efficiency of resource can be caused.
Further, the user terminal entering TDD region from FDD region has symmetrical traffic attribute, then its resource availability is by by the impact of dual-mode, closely, the dual-mode therefore switching this user terminal only can not increase the complexity of system.
Fig. 2 is the reference diagram of another problem of the wireless communication system illustrated based on existing mixing duplex mode.As shown in Figure 2, existing system fixes the line of demarcation, line of demarcation in TDD region and FDD region, therefore cannot use the overall resource distributing to TDD mode and FDD mode neatly.That is, if the user distribution in the TDD region in community and FDD region is uneven, because cannot correspondingly manage TDD resource and FDD resource according to user distribution, therefore cannot effectively use the resource distributing to overall community.Therefore, when user concentrates on a certain region in two regions and causes traffic concentration phenomenon, the traffic will concentrate on FDD (or TDD) resource as shown in figure and cause the inefficient situation of side inadequate resource and opposite side resource affluence.
Therefore, technical task to be solved by this invention is to provide a kind of mixing dual-mode determining method and device, determine dual-mode after synthetically considering the positional information of user terminal and traffic characteristic in a wireless communication system, effectively use FDD resource and the TDD resource of distributing to community.
Technical scheme
In order to solve described technical task, the dual-mode of mixing dual-mode determining method in wireless communication system of the present invention in same community between base station with user terminal uses time division duplex (TDD) pattern or Frequency Division Duplexing (FDD) (FDD) pattern to communicate mutually, described community is divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode, comprise the following steps: step (a), obtain the positional information of user terminal and the traffic information between described user terminal and base station; And step (b), described user terminal, when the TDD line of demarcation as described TDD region and described FDD area limit line is moved, determines the dual-mode of described user terminal according to described traffic characteristic.
At this, described step (b) can determine the dual-mode of described user terminal according to the asymmetry of the described traffic.
And, described step (b), when the user terminal carrying out with tdd mode communicating moves to described FDD region from described TDD region, maintain tdd mode according to the asymmetry of the described traffic or be switched to fdd mode.Now, described step (b) comprises the following steps: step (b1), utilizes the up link of described user terminal and downlink traffic size and calculates the parameter of the asymmetry degree representing the described traffic; And step (b2), the described parameter calculated and preset critical are compared, maintains tdd mode according to its result or be switched to fdd mode.
And, described step (b), when the user terminal carrying out with fdd mode communicating moves to described TDD region from described FDD region, maintain fdd mode according to the asymmetry of the described traffic or be switched to tdd mode.Now, described step (b) comprising: step (b1), utilizes the up link of described user terminal and downlink traffic size and calculates the parameter of the asymmetry degree representing the described traffic; And step (b2), the described parameter calculated and preset critical are compared, maintains fdd mode according to its result or be switched to tdd mode.
And described TDD line of demarcation can determine adaptively according to the distribution of the TDD traffic in described community and the FDD traffic.Now, the multiple sectors being divided into the different frequency resource of distribution at least partially of described community, each sector can determine described TDD line of demarcation independently.
At this, described in each sector Independent Decisiveness described during TDD line of demarcation, described TDD line of demarcation can be determined adaptively according to the distribution of the TDD traffic in this sector and the FDD traffic.Now, described TDD line of demarcation can determine according to the ratio of the traffic more than needed of the traffic more than needed of the tdd mode in this sector described and fdd mode.At this, the marginal determining method of described TDD can comprise the following steps: to calculate parameter, the ratio of the traffic more than needed of tdd mode described in this Parametric Representation and the traffic more than needed of described fdd mode; Compare for the described parameter calculated and the first preset critical, optionally expand described TDD line of demarcation according to its result; And compare for the described parameter calculated and the second preset critical, optionally shrink described TDD line of demarcation according to its result.
And, can determine according to the interference of the peripheral cell from described community the maximum that the described TDD line of demarcation of each sector can have.Now, the maximum that described TDD line of demarcation can have can determine according to the Signal to Interference plus Noise Ratio of this sector, the user distribution model that this Signal to Interference plus Noise Ratio converges according to the base station, peripheral cell from described community and transferring electric power information and estimate.
In order to solve described technical task, the dual-mode of mixing dual-mode determination device in wireless communication system of the present invention in same community between base station with user terminal uses time division duplex (TDD) pattern or Frequency Division Duplexing (FDD) (FDD) pattern to communicate mutually, described community is divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode, and comprise: terminal location and traffic information acquiring unit, obtain the positional information of user terminal and the traffic information between described user terminal and base station; And dual-mode determining means, when described user terminal moves in the TDD line of demarcation as described TDD region and described FDD area limit line, determine the dual-mode of described user terminal according to described traffic characteristic.
At this, described dual-mode determining means can determine the dual-mode of described user terminal according to the asymmetry of the described traffic.Now, described dual-mode determining means, when the user terminal carrying out communicating with tdd mode moves to described FDD region from described TDD region, can maintain tdd mode according to the asymmetry of the described traffic or be switched to fdd mode.And described dual-mode determining means, when the user terminal carrying out communicating with fdd mode moves to described TDD region from described FDD region, can maintain fdd mode according to the asymmetry of the described traffic or be switched to tdd mode.
And described dual-mode determination device can also comprise TDD line of demarcation information updating unit, determine described TDD line of demarcation adaptively according to the distribution of the TDD traffic in described community and the FDD traffic.Now, the multiple sectors being divided into the different frequency resource of distribution at least partially of described community, described TDD line of demarcation information updating unit can determine the described TDD line of demarcation of each sector independently.
And described dual-mode determination device also comprises TDD boundary district determining means, determine according to the interference of the peripheral cell from described community the maximum that the described TDD line of demarcation of each sector can have.
Beneficial effect
Described the present invention considers position information of user's terminal and traffic characteristic when wireless communication system determines dual-mode simultaneously, can use the FDD resource and TDD resource of distributing to community expeditiously.
Accompanying drawing explanation
Fig. 1 is a citing of the wireless communication system based on existing mixing duplex mode.
Fig. 2 is the reference diagram of another problem of the wireless communication system illustrated based on existing mixing duplex mode.
Fig. 3 shows cell structure and the parallel compensate of the mixing dual-mode determining method in the wireless communication system of one embodiment of the invention.
Fig. 4 is the flow chart of the dual-mode determining method of one embodiment of the invention.
Fig. 5 is that one embodiment of the invention is correspondingly determining the marginal method flow diagram of TDD.
Fig. 6 is the figure that the TDD line of demarcation of each sector of one embodiment of the invention is expanded according to unit distance or shunk.
Fig. 7 is the calcspar of the mixing dual-mode determination device in the wireless communication system of one embodiment of the invention.
Fig. 8 abandons (dropping) probability simulation result figure based on user moving speed in one embodiment of the invention.
Fig. 9 is based on the drop probability analog result figure of user's ratio requiring asymmetric communication amount in one embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings the preferred embodiment of the present invention will be described in detail.In explanation below and accompanying drawing, actual identical inscape by same for use pictorial symbolization to avoid repeat specification.When illustrating of the present invention, if think that the related description of relevant known features or function may obscure purport of the present invention, by description is omitted.
Fig. 3 shows cell structure and the parallel compensate of the mixing dual-mode determining method in the wireless communication system of one embodiment of the invention.
The mixing dual-mode determining method of the present embodiment is, in same community, use tdd mode or fdd mode to communicate mutually as dual-mode between base station with user terminal, community is then divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode.
Refer to the cell structure shown in Fig. 3 (a), a part of inner region of community, the inside, line of demarcation (hereinafter referred to as " field, TDD sector ") that such as this figure dotted line indicates is divided into multiple (the present embodiment the is 3) sector being assigned distinct frequencies resource.As shown in Fig. 3 (a) Yu (b), each sector in field, TDD sector is assigned with different frequency resource f1, f2, f3 substantially, and the FDD region outside field, TDD sector is then assigned other frequency resource in addition.
Each sector recycling is divided as the division marginal TDD line of demarcation (illustrated solid line) in TDD region and FDD region.The TDD line of demarcation of each sector by for each sector with the distribution of the traffic Independent Decisiveness.Each sector then determines the dual-mode of user terminal when TDD line of demarcation is moved according to the traffic characteristic of this user terminal.
And the TDD line of demarcation of each sector is by the noncontinuity line of demarcation k of certain intervals i, jr defines.
Now, TDD line of demarcation can be maximum k maxr and the minimum value k that can have minvalue between R.At this, R is radius of society, coefficient k i, jit is the radius in the TDD region representing i-th sector being equivalent to jGe community.
Therefore, k i, jcan be represented by following mathematical expression.
Mathematical expression 1
0＜k min＜k i，j＜k max＜1
Base station adjusts transferring electric power to provide tdd mode service to the TDD line of demarcation of the respective change according to the traffic distribution in community.Therefore need for following user terminal provides transferring electric power in addition, this user terminal outside TDD line of demarcation, that is runs with TDD to the line of demarcation in field, TDD sector from TDD line of demarcation.
From the marginal maximum of TDD (k to the line of demarcation of community maxr ~ R) only run in FDD mode, from center of housing estate portion to the marginal minimum value of TDD (0 ~ k minr) then only run in TDD mode.And, (k between the marginal maxima and minima of TDD minr ~ k maxr) region, substantially, runs in FDD mode in FDD region, then runs in TDD mode in TDD region.But, at the user terminal of TDD line of demarcation movement then according to the traffic characteristic between this user terminal and base station, the dual-mode original by base station selected maintenance or be switched to the dual-mode corresponding to moved region.Therefore, with fdd mode run user terminal from k minr is distributed to line of demarcation, community, is then distributed to k from cell centre with the user terminal that tdd mode runs maxr.
In addition, the TDD line of demarcation of each sector upgrades according to some cycles, for this reason, allows and represent that the coefficient of TDD zone radius changes according to certain unit α at each fixed cycle T shown in following row mathematical expression.
Mathematical expression 2
k i，j(t+T)＝k i，j(t)+α，0＜α＜1
According to the dual-mode determining method of described cell structure and each user terminal, substantially tdd mode and fdd mode is determined according to customer location, user terminal is when TDD line of demarcation is moved, when namely moving from TDD region to FDD region or move to TDD region from FDD region, determine duplex mode according to the traffic attribute of this user terminal.And, correspondingly determine TDD line of demarcation according to the traffic distribution of overall community.
First, the specific embodiment for the dual-mode determining method of each user terminal is described.Fig. 4 is the flow chart of the dual-mode determining method of one embodiment of the invention.In the present embodiment, substantially, base station determines dual-mode according to user terminal location, if user terminal moves in TDD line of demarcation, then whether basis meets certain condition based on traffic characteristic and determine maintain current duplex pattern or be switched to other pattern.Prerequisite is in the following description, runs when active user's terminal is positioned at TDD region with tdd mode, runs when being positioned at FDD region with fdd mode.
Base station obtains the traffic information (step 400) of the positional information of user terminal and the up link between user terminal and base station and down link.In addition, base station has the marginal relevant information of TDD of each sector, and this information is periodic continuous updating then.Whether base station monitoring user terminal moves (step 410) in TDD line of demarcation, if user terminal moves in TDD line of demarcation, then for representing that the parameter of traffic asymmetry degree carries out calculating (step 415).For the described parameter lambda of a kth user terminal kfollowing mathematical expression can be used to calculate.
Mathematical expression 3
λ k = max { w k up , w k down } min { w k up , w k down }
At this,
with represent the up link of a kth user terminal and the actual traffic size of down link respectively.As described in shown in mathematical expression, λ kvalue larger, the asymmetry of the traffic is larger.
If at the user terminal (step 420) that the user terminal of TDD line of demarcation movement is from TDD region to the movement of FDD region, check whether and meet following mathematical expression (step 425) simultaneously.
Mathematical expression 4
λ k＜ε， w total , FDD - w FDD ≥ 2 × max { w k up , w k down }
In the first formula, ε is predefine value, is a kind of critical value using the traffic asymmetry that can overcome during resource in FDD mode.That is, as long as λ kbe less than ε, even if use FDD mode, the inefficiencies of resource use also can not form large problem.Second formula represents that the traffic that FDD region can hold further is more than or equal to the traffic required when running kth terminal with fdd mode.At this,
W total, FDDrepresent the open ended total traffic capacity size of frequency band in FDD region,
W fDDrepresent the current traffic sum accepting the user terminals of service with fdd mode.
W fDDfollowing mathematical expression can be used to calculate.
Mathematical expression 5
w FDD = Σ K = 1 N w k , FDD
At this, N represents the quantity of the user terminal accepting service with fdd mode.
Therefore, if meet described mathematical expression 4, then the dual-mode of this user terminal is switched to fdd mode (step 430) from tdd mode.
In addition, if do not meet described mathematical expression 4, then the dual-mode of this user terminal is maintained tdd mode (step 440).Now, because user terminal leaves TDD region and away from base station, therefore transferring electric power should be distributed in addition for the frequency of utilization of this user terminal.For the user terminal maintaining dual-mode, periodically again check whether in step 425 and meet described mathematical expression 4, if met, dual-mode is switched to fdd mode (step 430).
At the user terminal of TDD line of demarcation movement if move to the user terminal (step 420) in TDD region from FDD region, then check whether and meet following mathematical expression (step 445) simultaneously.
Mathematical expression 6
λ k＞ε， w i , total , TDD - w i , TDD ≥ w k , i up + w k , i down
In the first formula, if λ kthen asymmetry is comparatively large to be greater than ε, represents the poor efficiency reducing resource and uses and need to use tdd mode.Second formula represents that the traffic that the TDD region of i-th sector can hold further is more than or equal to the traffic required when running kth terminal with tdd mode.At this,
W i, total, TDDrepresent the open ended total traffic capacity size of frequency band that the TDD region of i-th sector belonging to this user terminal is distributed,
W i, TDDrepresent the current traffic sum accepting the user terminals of service i-th sector with tdd mode.
W i, TDDfollowing mathematical expression can be used to calculate.
Mathematical expression 7
w i , TDD = Σ K = 1 K i w k , i , TDD
At this,
K irepresent the quantity of the user terminal accepting service i-th sector with tdd mode.
Therefore, if meet described mathematical expression 6, then the dual-mode of this user terminal is switched to tdd mode (step 450) from fdd mode.
In addition, if cannot meet described mathematical expression 6, the dual-mode of this user terminal will maintain fdd mode (step 455).For the user terminal maintaining fdd mode, periodically check whether and meet following mathematical expression (step 460), if met, then dual-mode is switched to tdd mode (step 450) from fdd mode.
Mathematical expression 8
w FDD＞a， w i , total , TDD - w i , TDD ≥ w k , i up + w k , i down
Second formula of described mathematical expression 8 is identical with the second formula of described mathematical expression 6, acting as of first formula, is switched to tdd mode the user terminal run with fdd mode in TDD region when the current traffic sum accepting the user terminals of service with fdd mode exceedes preset critical a.Traffic concentration so just can be prevented in the phenomenon of FDD resource.
In the aforementioned embodiment, dual-mode switching or maintain can perform according to following manner.From the pilot signal that base station receives, dual-mode switching index is comprised at user terminal.When determining in base station to switch the dual-mode of certain user terminal, the described index of pilot signal is made into 1 or make 0 into from 1 from 0.So, the change of the described index of the pilot signal that user terminal sends according to base station and learn that the dual-mode of oneself will be switched at next frame, this user terminal runs with other dual-mode at next frame and completes switching.
Correspondingly determine that the specific embodiment of the marginal method of TDD is described for the traffic distribution according to overall community below.In the present embodiment, under mixing duplex environment, define multiple noncontinuity TDD line of demarcation at Intra-cell, correspondingly expand according to the traffic distribution of tdd mode and fdd mode or shrink TDD line of demarcation.
As previously mentioned, according to the traffic attribute of the user terminal of movement and when determining the dual-mode of each user terminal, the traffic of the tdd mode in community and fdd mode may be allowed to distribute more unevenly.Sometimes, can also occur continually with tdd mode or the phenomenon concentrating on center of housing estate Bu Huo community gabarit with the user terminal that fdd mode runs.
Fig. 5 is that one embodiment of the invention is correspondingly determining the marginal method flow diagram of TDD.Embodiment described below is for i-th sector in sector multiple in community, and the method for the present embodiment will perform independently in each sector.
According to some cycles, i-th sector for field, TDD sector utilizes following mathematical expression calculating parameter γ i, this Parametric Representation is equivalent to the ratio (step 510) of the traffic more than needed of the tdd mode of this sector and the traffic more than needed of fdd mode.
Mathematical expression 9
γ i = ( w i , total , TDD - w i , TDD ) / w i , total , TDD ( w total , FDD - w FDD ) / w total , FDD
At this, w i, total, TDDrepresent the open ended total traffic capacity size of frequency band that the TDD region of i-th sector is distributed, w i, TDDrepresent the current traffic sum accepting the user terminals of service i-th sector with tdd mode, w total, FDDrepresent the open ended total traffic capacity size of frequency band in FDD region, w fDDrepresent the current traffic sum accepting the user terminals of service with fdd mode.Therefore, according to described mathematical expression 9, γ ithe traffic more than needed of larger tdd mode is more, γ ithe traffic more than needed of less fdd mode is more.
Therefore, in the present embodiment, more described γ iwith preset critical, the more current traffic sum w accepting the user terminals of service with fdd mode fDDwith preset critical, then according to its result expansion TDD line of demarcation.Specifically, check whether the condition (step 520) meeting following mathematical expression and propose, if met, then expand TDD line of demarcation (step 530).In described mathematical expression 2, to representing that the coefficient of TDD zone radius increases certain unit a, to expand TDD line of demarcation.
Mathematical expression 10
γ i≥η E，w FDD＞β E
At this, η ewith β ebe expressed as expansion TDD line of demarcation and and γ ithe critical value compared and w fDDthe critical value compared.
In described mathematical expression 2, to representing that the coefficient of TDD zone radius increases described certain unit a, just TDD line of demarcation can be expanded.
Meanwhile, more described γ iwith other preset critical, the more current traffic sum w accepting the user terminals of service i-th sector with tdd mode i, TDDwith preset critical, then shrink TDD line of demarcation according to its result.
Specifically, check whether the condition (step 540) meeting following mathematical expression, if met, then shrink TDD line of demarcation (step 550).In described mathematical expression 2, for representing that the coefficient of TDD zone radius reduces certain unit a, just TDD line of demarcation can be shunk.
Mathematical expression 11
γ i≤η S，w i，TDD＞β S
At this, η swith β sbe expressed as contraction TDD line of demarcation and and γ ithe critical value compared and w i, TDDthe critical value compared.
In addition, when the marginal expansion of TDD and contraction occur continuously repeatedly, if its number of times has exceeded M time as preset times, preferably, in the TDD region of new expansion, temporarily service is limited for starting with the user terminal of tdd mode operation.And, consider the interference between abutting subdistrict, should prevent the marginal expansion of TDD from exceeding the marginal boundary district of TDD (field, TDD sector) of setting in advance.
Fig. 6 is the figure that the TDD line of demarcation of each sector of one embodiment of the invention is expanded according to unit distance or shunk.As shown in Figure 6, TDD line of demarcation is at least radius d ' (=k minr) with maximum radius d (=k maxr) shrink or expansion according to unit distance between.
Furthermore, in one embodiment of this invention, when user distribution and the interference of considering peripheral cell, for each user terminal allocated frequency band, the marginal boundary district of TDD when correspondingly running TDD line of demarcation is determined.
Reference BTS in this community collects the transferring electric power of the Zhi Yuge sector, TDD line of demarcation for each sector required by frequency band allocation information, user terminal distributed model, peripheral cell from the base station of peripheral cell.
In the cell, the user terminal run with tdd mode in FDD region for and peripheral cell between interference ratio more fragile, therefore based on the frequency band allocation information of the peripheral cell of described collection etc., priority allocation is for the frequency band of these user terminals, and the frequency field that the user terminals can avoiding and be distributed in abutting subdistrict gabarit like this use repeats.
And, weighted value is defined based on collected user terminal distributed model, this weighted value represents the user terminal intensity of the corresponding sector of peripheral cell, calculate the interference between ul transmissions Zhong Gai community and peripheral cell after giving this weighted value, recycle its result presumption up link Signal to Interference plus Noise Ratio (SINR).Then, transmit by each collected sector the interference calculated based on power information between downlink transmission Zhong Gai community and peripheral cell, recycle its result presumption down link Signal to Interference plus Noise Ratio.
Based on the up link calculated like this and down link Signal to Interference plus Noise Ratio, determine the marginal boundary district of the TDD of each sector.Concrete deciding means is, the radius in Signal to Interference plus Noise Ratio Yue great boundary district is less, the radius in Signal to Interference plus Noise Ratio Yue little boundary district is larger.The radius in boundary district can by illustrated, the coefficient k that represents the marginal maximum of TDD maxdefinition.
Fig. 7 is the calcspar of the mixing dual-mode determination device in the wireless communication system of one embodiment of the invention, and this device is arranged on the base station of community.The mixing dual-mode determination device of the present embodiment performs described mixing dual-mode determining method, therefore, even if omitted, be still used in the mixing dual-mode determination device of the present embodiment above for the content described in mixing dual-mode determining method below.As shown in the figure, mix dual-mode determination device and comprise TDD and FDD resource service condition acquiring unit 710, dual-mode determining means 720, terminal location and traffic information acquiring unit 730, TDD line of demarcation information updating unit 740, TDD boundary district determining means 750, peripheral cell information acquisition unit 760.
Terminal location and traffic information acquiring unit 730 obtain the traffic information of up link between the positional information of intra-cell users terminals and each user terminal and base station and down link.
TDD and FDD resource service condition acquiring unit 710 obtains TDD and the FDD resource service condition in community, such as, accept in the traffic sum of the user terminals of service, each sector with fdd mode with the relevant information of the traffic sum of the user terminals of tdd mode acceptance service etc. in community.In addition, TDD and FDD resource service condition acquiring unit 710 also has following message, the relevant information of open ended total traffic capacity size of frequency band that the TDD region of the frequency band open ended total traffic capacity size in FDD region, each sector is assigned with etc.
TDD line of demarcation information updating unit 740 stores the marginal relevant information of the TDD of each sector in community, correspondingly determines TDD line of demarcation according to the traffic distribution in community.TDD line of demarcation information updating unit 740 obtains to carry out the marginal expansion of TDD or contraction and the information obtained from TDD and FDD resource service condition acquiring unit 710, and accordingly to the TDD line of demarcation information updating operation that the TDD line of demarcation of each sector regularly maintains, expands or shrinks and so on.TDD line of demarcation can by the coefficient k illustrated i, jdefinition, this coefficient represents the TDD zone radius of each sector, and aftermentioned dual-mode determining means 720 can learn TDD line of demarcation information with reference to this coefficient information.The action of TDD line of demarcation information updating unit 740 is identical with determining the related description of the marginal method of TDD shown in Fig. 5 accordingly, therefore will not describe in detail.
The relevant information of TDD and FDD resource service condition, the TDD line of demarcation information from TDD line of demarcation information updating unit 740 that the position information of user's terminal obtained according to terminal location and traffic information acquiring unit 730 and traffic information, TDD and FDD resource service condition acquiring unit 710 obtain, dual-mode determining means 720 can determine according to the traffic characteristic of this user terminal switch or maintain its dual-mode at user terminal when TDD line of demarcation is moved.The action of dual-mode determining means 720 is identical with the related description of the determining method of dual-mode shown in Fig. 4, therefore will not describe in detail.
The result that dual-mode determining means 720 determines is transferred to this user terminal as the switching index of dual-mode by transmitting device (not shown) using in pilot signal.
Peripheral cell information acquisition unit 760 collects the transferring electric power of the Zhi Yuge sector, TDD line of demarcation for each sector required by frequency band allocation information, user terminal distributed model, peripheral cell from the base station of peripheral cell.For this reason, in the present embodiment, each base station the described information periodic transmission of the community of oneself to peripheral base station.
TDD boundary district determining means 750 determines boundary district according to the user distribution of peripheral cell and interference, and this boundary district is the marginal boundary district of TDD when running TDD line of demarcation accordingly.And, as determining the value in boundary district, illustrated above, the coefficient k that represents the marginal maximum of TDD maxtDD line of demarcation information updating unit 740 is transferred to after being determined.So, TDD line of demarcation information updating unit 740 when determining the TDD line of demarcation of each sector, the boundary district that can prevent from the marginal expansion of TDD from exceeding TDD boundary district determining means 750 defining.The action of TDD boundary district determining means 750 with illustrated above, correspondingly run TDD line of demarcation time the decision process in boundary district, TDD line of demarcation identical, therefore will not describe in detail.
Fig. 8 and Fig. 9 be respectively in the described embodiment of the present invention based on user moving speed abandon (dropping) probability and based on the drop probability analog result figure of user's ratio requiring asymmetric communication amount.In this simulation, assume the scene of three types as shown in the following table.First scene is best (BEST) type, TDD region is run with minimum scope in peripheral cell, second scenario is common (NORMAL) type, TDD region is run with random TDD line of demarcation in each sector of peripheral cell, 3rd scene is the poorest (WORST) type, and TDD region is run with maximum scope in peripheral cell.Best type is equivalent to the relatively minimum environment of interference between peripheral cell, and the poorest type is then equivalent to the relatively maximum environment of interference between peripheral cell.
Table 1
bEST tDD region is run with minimum scope in peripheral cell.
nORMAL tDD district is run with random TDD line of demarcation in each sector of peripheral cell
territory.
wORST tDD region is run with maximum scope in peripheral cell.
Fig. 8 and Fig. 9 also show all types of drop probability when existing mixing dual-mode determines.As shown in Figure 8, the average speed of user terminal is higher, and best type is higher relative to the existing improvement degree mixed when dual-mode determines with general type.As shown in Figure 9, require that the more drop probabilities of the user of asymmetric communication amount all more increase, also can find out that improvement degree when determining relative to existing mixing dual-mode more increases.
Described the present invention distinguishes field, TDD sector in the community of mixing duplex environment with multiple sector, the TDD line of demarcation in TDD region and FDD region is gone out to distinguish for each sector definition, based on traffic distribution in the traffic characteristic of user terminal and community, effective traffic management is carried out for the user terminal in TDD region and the movement of FDD region and continues to provide service.According to the traffic characteristic of the user terminal in the movement of TDD line of demarcation and presently used traffic conditions for each user terminal selecting dual-mode, thus significantly improve the efficiency that resource uses.And, owing to correspondingly determining TDD line of demarcation according to the traffic distribution in community, therefore can the corresponding traffic characteristic differently defined according to TDD and FDD neatly, meanwhile, the poor efficiency of the resource that the asymmetry that as far as possible can also reduce user traffic in each pattern of TDD and FDD causes uses.And; in order to protect from the interference of peripheral cell; when user distribution and the interference of considering peripheral cell; for each user terminal allocated frequency band to reduce the infringement interfered and cause, specify the interference increase phenomenon that the marginal maximum extent of TDD causes to prevent TDD area extension.Therefore, the present invention goes for following system, and this system is mixing the efficiency that can increase resource under duplex environment constantly by the traffic characteristic of user terminal with based on movement.
In addition, described embodiments of the invention can be made into the program performed by computer, and can realize on general digital (Digital) computer that use readable in computer type recording medium performs described program.Described readable in computer type recording medium comprises magnetic storage medium (such as, ROM, floppy disk, hard disk etc.), optics interpretation medium (such as, CD, DVD etc.) and the storing media of carrier wave (such as, via the transmission of the Internet) and so on.
Above by reference to the accompanying drawings with preferred embodiment to invention has been detailed description, but it is only explain instead of limit the present invention to the present invention, in technological thought category of the present invention, various distortion and amendment can be realized according to detailed description of the present invention, this is obviously same industry personage, therefore the interest field that the present invention is real should determine according to the technological thought of right and equivalence range thereof, and any simple modification done for this embodiment and change neither depart from spirit and the scope of the present invention.

Claims (13)

1. a dual-mode determining method, for the mixing dual-mode determining method in wireless communication system, it is characterized in that, dual-mode in same community between base station with user terminal uses time division duplex (TDD) pattern or Frequency Division Duplexing (FDD) (FDD) pattern to communicate mutually, described community is divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode, comprises the following steps:
Step (a), obtains the positional information of user terminal and the traffic information between described user terminal and base station; And
Step (b), described user terminal, when the TDD line of demarcation as described TDD region and described FDD area limit line is moved, determines the dual-mode of described user terminal according to traffic characteristic,
Described TDD line of demarcation is determined adaptively according to the distribution of the TDD traffic in described community and the FDD traffic,
The multiple sectors being divided into the different frequency resource of distribution at least partially of described community, each sector determines described TDD line of demarcation independently,
Described in each sector Independent Decisiveness described during TDD line of demarcation, described TDD line of demarcation is determined adaptively according to the distribution of the TDD traffic in this sector and the FDD traffic, described TDD line of demarcation according to the tdd mode in this sector described have more than needed the traffic and fdd mode have more than needed the traffic ratio and determine
The marginal determining method of described TDD comprises the following steps:
Parameter γ is calculated by following mathematical expression i, this parameter γ irepresent the ratio for the traffic more than needed of the described tdd mode of i-th sector in field, TDD sector and the traffic more than needed of described fdd mode;
The described parameter calculated and the first preset critical are compared, optionally expands described TDD line of demarcation according to its result; And
The described parameter calculated and the second preset critical are compared, optionally shrink described TDD line of demarcation according to its result,
γ i = ( w i , total , TDD - w i , TDD ) / w i , total , TDD ( w total , FDD - w FDD ) / w total , FDD
Wherein, w i, total, TDDrepresent the open ended total traffic capacity size of frequency band that the TDD region of i-th sector is distributed, w i, TDDrepresent the current traffic sum accepting the user terminals of service i-th sector with tdd mode, w total, FDDrepresent the open ended total traffic capacity size of frequency band in FDD region, w fDDrepresent the current traffic sum accepting the user terminals of service with fdd mode.
2. dual-mode determining method according to claim 1, is characterized in that:
Described step (b), determine the dual-mode of described user terminal according to the asymmetry of the described traffic.
3. dual-mode determining method according to claim 2, is characterized in that:
Described step (b), when the user terminal carrying out with tdd mode communicating moves to described FDD region from described TDD region, maintain tdd mode according to the asymmetry of the described traffic or be switched to fdd mode.
4. dual-mode determining method according to claim 3, is characterized in that,
Described step (b) comprising:
Step (b1), utilizes the up link of described user terminal and downlink traffic size and calculates the parameter of the asymmetry degree representing the described traffic; And
Step (b2), the parameter calculated relatively and preset critical, maintain tdd mode according to its result or be switched to fdd mode.
5. dual-mode determining method according to claim 2, is characterized in that:
Described step (b), when the user terminal carrying out with fdd mode communicating moves to described TDD region from described FDD region, maintain fdd mode according to the asymmetry of the described traffic or be switched to tdd mode.
6. dual-mode determining method according to claim 5, is characterized in that,
Described step (b) comprises the following steps:
Step (b1), utilizes the up link of described user terminal and downlink traffic size and calculates the parameter of the asymmetry degree representing the described traffic; And
Step (b2), the parameter calculated relatively and preset critical, maintain fdd mode according to its result or be switched to tdd mode.
7. dual-mode determining method according to claim 1, is characterized in that:
The maximum that the described TDD line of demarcation of each sector can have is determined according to the interference of the peripheral cell from described community.
8. dual-mode determining method according to claim 7, is characterized in that:
The maximum that described TDD line of demarcation can have determines according to the Signal to Interference plus Noise Ratio of this sector, the user distribution model that this Signal to Interference plus Noise Ratio converges according to the base station, peripheral cell from described community and transferring electric power information and estimate.
9. a dual-mode determination device, for the mixing dual-mode determination device in wireless communication system, it is characterized in that, dual-mode in same community between base station with user terminal uses time division duplex (TDD) pattern or Frequency Division Duplexing (FDD) (FDD) pattern to communicate mutually, described community is divided into the TDD region corresponding to tdd mode and the FDD region corresponding to fdd mode, and comprises:
Terminal location and traffic information acquiring unit, obtain the positional information of user terminal and the traffic information between described user terminal and base station; And
Dual-mode determining means, when described user terminal moves in the TDD line of demarcation as described TDD region and described FDD area limit line, determines the dual-mode of described user terminal according to traffic characteristic,
Also comprise TDD line of demarcation information updating unit, determine described TDD line of demarcation adaptively according to the distribution of the TDD traffic in described community and the FDD traffic,
The multiple sectors being divided into the different frequency resource of distribution at least partially of described community,
Described TDD line of demarcation information updating unit determines the described TDD line of demarcation of each sector independently,
Described TDD line of demarcation according to the tdd mode in described sector have more than needed the traffic and fdd mode have more than needed the traffic ratio and determine,
When described TDD line of demarcation information updating unit determines described TDD line of demarcation, calculate parameter γ by following mathematical expression i, this parameter γ irepresent the ratio for the traffic more than needed of the described tdd mode of i-th sector in field, TDD sector and the traffic more than needed of described fdd mode, and the described parameter calculated and the first preset critical are compared, described TDD line of demarcation is optionally expanded according to its result, and the described parameter calculated and the second preset critical are compared, described TDD line of demarcation is optionally shunk according to its result
γ i = ( w i , total , TDD - w i , TDD ) / w i , total , TDD ( w total , FDD - w FDD ) / w total , FDD
Wherein, w i, total, TDDrepresent the open ended total traffic capacity size of frequency band that the TDD region of i-th sector is distributed, w i, TDDrepresent the current traffic sum accepting the user terminals of service i-th sector with tdd mode, w total, FDDrepresent the open ended total traffic capacity size of frequency band in FDD region, w fDDrepresent the current traffic sum accepting the user terminals of service with fdd mode.
10. dual-mode determination device according to claim 9, is characterized in that:
Described dual-mode determining means determines the dual-mode of described user terminal according to the asymmetry of the described traffic.
11. dual-mode determination devices according to claim 10, is characterized in that:
When the user terminal carrying out communicating with tdd mode moves to described FDD region from described TDD region, described dual-mode determining means maintains tdd mode according to the asymmetry of the described traffic or is switched to fdd mode.
12. dual-mode determination devices according to claim 10, is characterized in that:
When the user terminal carrying out communicating with fdd mode moves to described TDD region from described FDD region, described dual-mode determining means maintains fdd mode according to the asymmetry of the described traffic or is switched to tdd mode.
13. dual-mode determination devices according to claim 9, is characterized in that:
Also comprise TDD boundary district determining means, determine according to the interference of the peripheral cell from described community the maximum that the described TDD line of demarcation of each sector can have.
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