CN103096487B - The method and system of semi-persistent scheduling in a kind of heterogeneous network - Google Patents
The method and system of semi-persistent scheduling in a kind of heterogeneous network Download PDFInfo
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Abstract
A method for semi-persistent scheduling in heterogeneous network, the method comprises: the reference signal receiving intensity RSRP fed back based on user UE selects to be disturbed user; According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe; Macro base station, according to the priority of subframe, determines the subframe as almost empty frame ABS.The invention also discloses the system of semi-persistent scheduling in a kind of heterogeneous network.After the application embodiment of the present invention, effectively reduce the expense of control channel and reduce time delay.
Description
Technical field
The present invention relates to communication technical field, more specifically, relate to the method and system of semi-persistent scheduling in a kind of heterogeneous network.
Background technology
Now there are some researches show, in Long Term Evolution advanced person (LTE-advanced) system, introduce heterogeneous network.Heterogeneous network refers to that macrocell lower floor also deploys Microcell.As long-distance radio frequency unit (RRH), femto base station (PicoeNB), Home eNodeB (HomeeNB) and relay base station (relayeNB).Typically heterogeneous network has two kinds of deployment way.One is macrocell (macrocell)+home base station cells (femtocell), and another kind is macrocell+ picocell (picocell) or relaying cell (relaycell).The introducing of Microcell result in more cell border areas, thus causes extra interference.Unbalanced power between macrocell and Microcell causes particularly serious interference to the UE being in cell border areas., all there is serious interference problem in above-mentioned two kinds of deployment way.
In the deployment way of macrocell+picocell or relaycell, interference mainly comes from distributed area and expands (rangeexpansion).Rangeexpansion uses to alleviate macro base station burden the reference signal receiving intensity (RSRP) being different from tradition access.Specifically, UE judge access macrocell or Microcell time, at the signal strength signal intensity RSRP from Microcell
microupper increase side-play amount (bias), bias is positive number, and bias is normally configured by upper layer device, and can semi-statically change under normal circumstances.RSRP
microupper increase bias again with the signal strength signal intensity RSRP from macrocell
macrorelatively, if RSRP
micro+ bias>=RSRP
macro, then UE selects access Microcell; Otherwise UE selects access macrocell.
Use rangeexpansion technology, the UE in accompanying drawing 1 in the extended region of Microcell can suffer severe jamming.Its reason is, comes from weakening from Microcell signal receiving strength on the one hand, comes from the enhancing from macrocell interference signal on the other hand.Result is in UE within the scope of the extended region of Microcell can not the possibility of correct Received signal strength be increased greatly, further causes throughput of system and declines.
How effectively to alleviate and even eliminate Microcell and introduce the key that the interference brought especially improves LTE-advanced systematic function, raising throughput.
Solution of the prior art is the time domain expansion of Release8/9 based on the ICIC of passback, usually uses almost empty frame (ABS).ABS mainly refers to that macro base station sends Physical Downlink Control Channel (PDCCH) and is almost empty subframe, to reduce the down control channel interference of the user (picoUE) to Microcell.In ABS, PDCCH is only containing reference signal (CRS) and necessary control information, and Physical Downlink Shared Channel (PDSCH) part still retains the transmission of CRS.
In addition, LTE-advanced system, in order to support the business such as VoIP, video flowing, adopts a kind of new dispatching technique one semi-persistent scheduling to transmit in light of its own characteristics.LTE-advanced system adopts the mode of shared resource to carry out the scheduled transmission of user data, base station (eNB) indicates the current schedule information of UE by PDCCH in initial schedule, it is semi-persistent scheduling that UE identifies, then preserve current schedule information, on identical running time-frequency resource position, carry out transmission or the reception of this business datum every the fixing cycle.Use semi-persistent scheduling transmits, the feature that voice packets periodically arrives can be made full use of, once authorize, cycle uses, effectively can save LTE-advanced system for dispatching the PDCCH resource of instruction, while not affecting speech quality and systematic function, more voice user can be supported, and retain certain control information for use for the business of dynamic dispatching.
Semi-persistent scheduling transmission effectively can save LTE-advanced system for dispatching the control channel resource of instruction.Micro-base station in Microcell and the macro base station of macrocell do respective semi-persistent scheduling process all respectively.In view of interference problem serious under heterogeneous network, ABS is adopted to alleviate the interference of macro base station to the PDCCH of side, micro-base station, ABS configuration done by macro base station cannot meet the demand of side, micro-base station for the semi-persistent scheduling of VOIP business, need to interrupt semi-persistent scheduling constantly, because this increasing the expense of control channel, add time delay accordingly.
Summary of the invention
The embodiment of the present invention proposes the method for semi-persistent scheduling in a kind of heterogeneous network, effectively reduces the expense of control channel and reduces time delay.
The embodiment of the present invention also proposes the system of semi-persistent scheduling in a kind of heterogeneous network, effectively reduces the expense of control channel and reduces time delay.
The technical scheme of the embodiment of the present invention is as follows:
A method for semi-persistent scheduling in heterogeneous network, the method comprises:
The reference signal receiving intensity RSRP fed back based on user UE selects to be disturbed user;
According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe;
Macro base station, according to the priority of subframe, determines the subframe as almost empty frame ABS.
The described RSRP based on UE feedback selects to be disturbed user and comprises: select to meet RSRP
macrowith RSRP
microdifference be more than or equal to RSRP
thresholdbe disturbed user, RSRP
macro.Be disturbed the RSRP that user receives from macrocell, RSRP
microbe disturbed the RSRP that user receives from Microcell, RSRP
thresholdfor the threshold value preset;
Describedly determine to comprise as the subframe of ABS to determine that ABS is the subframe that priority is the highest.
The described RSRP based on UE feedback selects to be disturbed user and comprises: select to meet
with
difference be less than
be disturbed user,
be disturbed the RSRP that user receives from macrocell,
be disturbed the RSRP that user receives from Microcell,
threshold value for presetting:
Describedly determine that subframe comprises as ABS and determine that ABS is any subframe except the highest subframe of priority.
The described number according to subframe each in semi-persistent scheduling being disturbed user, judges that the priority of subframe comprises: during activation according to semi-persistent scheduling, number subframe being disturbed user judges the priority of subframe;
Or,
During release according to semi-persistent scheduling, number subframe being disturbed user judges the priority of subframe:
Or,
According to the priority being determined subframe by as many as less of the number subframe of semi-persistent scheduling being disturbed user.
Described macro base station, according to the priority of subframe, determines that the subframe as ABS comprises: the priority of subframe is fed back by the X2 interface between micro-base station and macro base station in micro-base station, and the priority of macro base station foundation subframe determines the subframe as ABS.
Described macro base station, according to the priority of subframe, determines that the taking a step forward of subframe as ABS comprises: when micro-base station judges that the maximum difference of the priority order change of subframe is greater than default threshold value, by the priority of X2 interface to macro base station feedback subframe.
Described macro base station, according to the priority of subframe, comprises after determining the subframe as ABS further: the priority determination subframe according to subframe is sent to micro-base station as ABS by X2 interface by macro base station.
Described macro base station, according to the priority of subframe, determines that the subframe as ABS comprises: macro base station determines the subframe as ABS according to the priority of subframe and the weighted value shared by each subframe.
A system for semi-persistent scheduling in heterogeneous network, described device comprises:
Micro-base station, the reference signal receiving intensity RSRP fed back based on user UE selects to be disturbed user; According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe, the priority of subframe is fed back to macro base station;
Macro base station, according to the priority of subframe, determines the subframe as almost empty frame ABS.
The priority of subframe is fed back the priority of subframe by described micro-base station by the X2 interface between micro-base station and macro base station;
Described macro base station sends the subframe determined as ABS to micro-base station by X2 interface.
As can be seen from technique scheme, in embodiments of the present invention, the RSRP based on UE feedback selects to be disturbed user, is wherein disturbed user and comprises by interference user with by weak jamming user.According in the subframe of semi-persistent scheduling select be disturbed the priority that user judges subframe, macro base station according to the priority determination subframe of subframe as ABS.When carrying out semi-persistent scheduling, what need to transmit in empty frame is disturbed user and can be made full use of ABS, to meet the needs of micro-base station for the semi-persistent scheduling of VOIP business; Do not need the weak jamming user that is subject to of transmitting in empty frame to avoid ABS, save micro-base station further for dispatching the resource of instruction and decreasing time delay.
Accompanying drawing explanation
Fig. 1 is that the UE being in extended area in prior art is interfered schematic diagram;
Fig. 2 is the method flow schematic diagram of semi-persistent scheduling in embodiment of the present invention heterogeneous network;
Fig. 3 is the method idiographic flow schematic diagram of semi-persistent scheduling in embodiment of the present invention heterogeneous network;
Fig. 4 is the system configuration schematic diagram of semi-persistent scheduling in embodiment of the present invention heterogeneous network.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, surveyed after semi-persistent scheduling uses and how reasonably to have distributed ABS subframe and ABS subframe is adjusted, thus when configuring ABS, considered the demand of the business such as VoIP and video flowing.According in each subframe of interfered cell by interference user or the frequency that occurs by weak jamming user semi-persistent scheduling, determine a certain subframe as ABS or shielding as the priority of ABS, and X2 interface between macrocell and Microcell feed back.Thus make macro base station when determining ABS sub-frame configuration, fully taking into account the demand of the semi-persistent scheduling of interfered cell, therefore contributing to saving Microcell for dispatching the PDCCH resource of instruction.The requirement of high QoS user to time delay sensitivity is met while the expense effectively reducing control channel.
See the method flow schematic diagram that accompanying drawing 2 is semi-persistent schedulings in heterogeneous network, specifically comprise the following steps:
Step 201, based on UE feedback RSRP select be disturbed user.
If macro base station is numbered 0, micro-base station is numbered i=1,2 ..., N.Be dispersed with K user in community, its set is designated as Ω, and Ω=Ω
0u Ω
1u ... U Ω
n, wherein Ω
0for the UE served by macro base station gathers, its UE number is set to K
0; Ω
i(i=1,2 ..., N) and be gathered by the UE of i-th micro-base station service, its UE number is set to K
i.The normal transmission power of macro base station is P
eNB, the normal transmission power of micro-base station is P
pico, therefore the transmitting power of i-th node is P
i, then have
path loss between i-th node (represent macro base station during i=0, represent micro-base station i during i ≠ 0) and a jth user (j ∈ Ω) is expressed as h
i, j.
All UE measuring reference signals received powers.For each UEj (j=1,2 ..., K), its Connection Service community point is i, i.e. j ∈ Ω
i, then its Reference Signal Received Power measured is RSRP
i, j=h
i, jp
i, other access node i ' in the macrocell of measurement (i '=1,2 ..., N and i ≠ i) Reference Signal Received Power be RSRP
i ', j=h
i ', jp
i; All UE feedback from the RSRP information of diverse access point, for each mobile subscriber equipment j (j=1,2 ..., K), respective RSRP information (from micro-base station, macro base station) is fed back to its access station.
Classify to the UE that it is served in micro-base station, the UE set omega that each micro-base sites i connects
ibe divided into the UE set of two classifications: be disturbed more serious UE set
be disturbed more weak UE set
and have
Wherein sorting criterion is as follows: be namely disturbed more serious UE is that RSRP from macro base station is greater than the user of a certain threshold value with the difference from the RSRP of micro-base station by interference user, namely
namely be disturbed more weak UE is that RSRP from macro base station is less than the user of this threshold value with the difference from the RSRP of micro-base station by weak jamming user, namely
wherein RSRP
thresholdfor differentiating by interference user and the RSRP threshold value by weak jamming user.Generally RSRP
thresholdequal zero.By the user that interference user is needs do reinforcement interference coordination, be namely desirably in the user of empty frame transmission.Be do not need to do to strengthen the user of interference coordination, namely the interference-free user of non-NULL sub-frame transmission by weak jamming user.
Step 202, according to the subframe of semi-persistent scheduling is disturbed the priority that user judges subframe.
Typical VoIP business, it is 20ms that its packet arrives the cycle, as long as then eNB is indicated to UE semi-persistent scheduling by PDCCH, namely UE carries out transmission or the reception of this data dispatching according to the instruction of PDCCH, and after 20ms, identical running time-frequency resource position is carried out transmission or the reception of newly arrived VoIP data bag.
For semi-persistent scheduling transmission, relate to two crucial steps, i.e. the activation of semi-persistent scheduling transmission, and the release of semi-persistent scheduling transfer resource.
In LTE system, need the business of carrying out semi-persistent scheduling as VoIP etc., the initial stage is set up in business, relevant semi-persistent scheduling parameter will be configured by radio-resource-configuration agreement (RRC), as semi-static Transmission Time Interval, semi-persistent scheduling cell-radio network mark (SPS-C-RNTI), uplink transmit power etc.The activation of semi-persistent scheduling transmission is indicated by the PDCCH carrying out mask with SPS-C-RNTI.After UE receives the activation of semi-persistent scheduling transmission, periodically can send or the information of reception in fixing frequency resource according to its authorization message.Semi-persistent scheduling transmission is namely long-time once activation, periodically sends on fixed position or receives data.
A, for by for interference user, when there is the activation of semi-persistent scheduling, on a certain subframe k, micro-base station i add up that it serves by interference user set
semi-persistent scheduling number of users F (i, k) in this subframe.And to F (i, k) according to the order arrangement from many to few, select the recommendation subframe of subframe sequence number k as ABS of maximum F (i, k).Namely subframe is recommended to be by the highest subframe of interference user medium priority.
B, for by for weak jamming user, when there is the activation of semi-persistent scheduling, on a certain subframe k, what micro-base station i added up that it serves gathers by weak jamming user
semi-persistent scheduling number of users F (i, k) in this subframe, and to F (i, k) according to the order arrangement from many to few, select the shielding subframe of subframe sequence number k as ABS of larger F (i, k).Shielding subframe is by the highest subframe of weak jamming user medium priority.
Semi-persistent scheduling technology has once dispatches, the feature that the cycle sends or receives, and the release of resource after finishing using of its configuration becomes extremely important.If system resource does not successfully discharge after semi-persistent scheduling services terminates, then may cause serious interference to other users, thus cause the decline of systematic function.Such as, uplink semi-persistent scheduling is transmitted, if the semi-persistent resource release that system is not used after its service ending or release failure, then this UE transmits continuing in the resource of configuration, and now this Resourse Distribute may carry out transfer of data to other users by eNB, serious same frequency interference will be caused like this, cause base station to carry out demodulation; Same, for downlink transfer, if system does not discharge its resource or release failure after the semi-static service ending of UE, UE can continue to receive data on the resource location configured, and now this Resourse Distribute is given other users by eNB, will bring UE that not one's own data are carried out to demodulation and sent HARQ feedback information like this, base station be received to the consequence causing interference, and the waste of UE side electric power can be brought.
Current LTE protocol regulation, eNB needs by indicating UE to carry out the release of uplink/downlink semi-static scheduling resources with the PDCCH of SPS-C-RNTI mask.And corresponding regulation is made to the form of PDCCH, to reach the effect of release more reliably.
A, for by for interference user, when there is the release of semi-static scheduling resources, on a certain subframe k, micro-base station i upgrade that it serves by interference user set
semi-persistent scheduling number of users F (i, k) in this subframe, and to F (i, k) according to the order arrangement from many to few, select the recommendation subframe of subframe sequence number k as ABS of maximum F (i, k).
B, for by for weak jamming user, when there is the release of semi-static scheduling resources, on a certain subframe k, what micro-base station i upgraded that it serves gathers by weak jamming user
semi-persistent scheduling number of users F (i, k) in this subframe, and to F (i, k) according to the order arrangement from many to few, select the shielding subframe of subframe sequence number k as ABS of maximum F (i, k).
The priority determination subframe of step 203, macro base station foundation subframe is as ABS.
Micro-base station sends the priority of subframe by the X2 interface between micro-base station and macro base station, and macro base station is sent to micro-base station as ABS by X2 interface using according to the priority determination subframe of subframe.
For according to the feedback done by interference user, determine to recommend subframe to be ABS; For according to the feedback done by weak jamming user, determine that any subframe except shielding subframe is ABS.
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawing 3.
Step 301, micro-base station are added up by interference user number in each subframe, and determine the priority of subframe.
Micro-base station is monitored in real time to the semi-persistent scheduling situation in community.Add up its semi-persistent scheduling number of users F (i, k) by interference user in a certain subframe, sort from more to less according to added up number of users, obtain recommending the priority as ABS.
Step 302, judge that priority order changes.
Judge that larger change occurs priority order, then perform step 303; Otherwise, perform step 301.The maximum difference of priority order change is greater than default threshold value, then judge that larger change occurs priority order.Priority order change and each subframe are relative to the variable quantity of the priority of last time.Relative to the maximum variable quantity of the priority of last time in the maximum of priority order change and multiple subframe.If the maximum of priority order change is greater than default threshold value, then illustrate that larger change occurs priority order.This threshold value as the case may be and experience determine.
Step 303, micro-base station are fed back to macro base station by X2 interface.
Micro-base station is by the priority of X2 interface to macro base station feedback subframe.Such as, priority order is divided into two-stage: 0 and 1.Then feedback information to be priority order be 0 subframe numbers and priority order be the subframe numbers of 1
Step 304, macro base station collect the feedback of each micro-base station.
Macro base station receives the feedback that each micro-base station sends, and in view of micro-base station number of cell coverage area, adjustment needs the regular hour, therefore to be adjusted within the cycle of semi-persistent scheduling etc.
Step 305, judge that the common factor of micro-base station changes.
Judging the common factor of each base station feedback, if not change, then without the need to adjusting ABS, performing step 304; If change, then perform step 305.
Each macro base station comprises multiple micro-base station.Each micro-base station is all to the priority of affiliated macro base station feedback subframe.Macro base station according to each micro-base station feedback subframe priority shared by the priority of weight determination subframe.Such as, micro-base station A feeds back subframe priority and is: a subframe, b subframe, c subframe, and wherein the weight of the weight of a subframe to be the weight of 50%, b subframe be 30%, c subframe is 20%; Micro-base station B feeds back subframe priority: b subframe, c subframe, a subframe, wherein b subframe weight 50%, c subframe weight 30%, a subframe weight 20%.Now, total weight of total weight of a subframe to be total weight of 70%, b subframe be 80%, c subframe is 50%, and so the subframe priority of macro base station is b subframe, a subframe, c subframe.The common factor of micro-base station and the subframe priority of macro base station.
Step 305 is not the steps necessary of technical solution of the present invention.Also can not judge whether the common factor of micro-base station changes, directly according to the subframe priority adjustment ABS that each base station is fed back.
Step 306, macro base station send notice by X2 interface to micro-base station.
New ABS or ABS adjustment information is sent to micro-base station by the X2 interface between macro base station and micro-base station.
Step 301 is to the processing procedure of 303 micro-base stations; Step 304 is processing procedures of macro base station to 306.Step 301 is only just described by interference user to 306, determines like this to recommend subframe to be ABS.
Same, above-mentioned steps also can be utilized just to be described by weak jamming user, to determine that any subframe except shielding subframe is ABS like this.
Accompanying drawing 4 is the system configuration schematic diagram of semi-persistent scheduling in embodiment of the present invention heterogeneous network, and system comprises micro-base station and macro base station.
Micro-base station, the RSRP based on UE feedback selects to be disturbed user; According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe; The X2 interface that the priority of subframe feds back through between micro-base station and macro base station is fed back to macro base station;
Macro base station, according to the priority of subframe, determines the subframe as ABS, and macro base station sends the subframe determined as ABS to micro-base station by X2 interface.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the method for semi-persistent scheduling in heterogeneous network, it is characterized in that, the method comprises:
The reference signal receiving intensity RSRP fed back based on user UE selects to be disturbed user;
According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe;
Macro base station, according to the priority of subframe, determines the subframe as almost empty frame ABS;
The described number according to subframe each in semi-persistent scheduling being disturbed user, judges the priority of subframe, and macro base station, according to the priority of subframe, is determined the subframe as almost empty frame ABS, being comprised:
For by interference user, micro-base station in each subframe by the number of interference user according to from many to few sequence, the maximum subframe priority of number is the highest, as the ABS subframe of recommending;
For by weak jamming user, micro-base station in each subframe by the number of weak jamming user from many to few sequence, the maximum subframe priority of number is the highest, and conductively-closed is not as ABS subframe.
2. the method for semi-persistent scheduling in heterogeneous network according to claim 1, it is characterized in that, the described RSRP based on UE feedback selects to be disturbed user and comprises: select to meet RSRP
macrowith RSRP
microdifference be more than or equal to RSRP
thresholdbe disturbed user, RSRP
macrobe disturbed the RSRP that user receives from macrocell, RSRP
microbe disturbed the RSRP that user receives from Microcell, RSRP
thresholdfor the threshold value preset;
Describedly determine to comprise as the subframe of ABS to determine that ABS is the subframe that priority is the highest.
3. the method for semi-persistent scheduling in heterogeneous network according to claim 1, it is characterized in that, the described RSRP based on UE feedback selects to be disturbed user and comprises: select to meet RSRP
m'
acrowith RSRP
m'
icrodifference be less than RSRP
t'
hresholdbe disturbed user, RSRP
m'
acrobe disturbed the RSRP that user receives from macrocell, RSRP
m'
icrobe disturbed the RSRP that user receives from Microcell, RSRP
t'
hresholdfor the threshold value preset;
Describedly determine that subframe comprises as ABS and determine that ABS is any subframe except the highest subframe of priority.
4. the method for semi-persistent scheduling in heterogeneous network according to claim 1, it is characterized in that, described macro base station is according to the priority of subframe, determine that the subframe as ABS comprises: the priority of subframe is fed back by the X2 interface between micro-base station and macro base station in micro-base station, the priority of macro base station foundation subframe determines the subframe as ABS.
5. the method for semi-persistent scheduling in heterogeneous network according to claim 1, it is characterized in that, described macro base station is according to the priority of subframe, determine that the taking a step forward of subframe as ABS comprises: when micro-base station judges that the maximum difference of the priority order change of subframe is greater than default threshold value, by the priority of X2 interface to macro base station feedback subframe.
6. the method for semi-persistent scheduling in heterogeneous network according to claim 1, it is characterized in that, described macro base station is according to the priority of subframe, comprise further after determining the subframe as ABS: macro base station using according to the priority determination subframe of subframe as ABS, and be sent to micro-base station by X2 interface.
7. the system of semi-persistent scheduling in heterogeneous network, it is characterized in that, described system comprises:
Micro-base station, the reference signal receiving intensity RSRP fed back based on user UE selects to be disturbed user; According to the number being disturbed user in subframe each in semi-persistent scheduling, judge the priority of subframe, the priority of subframe is fed back to macro base station; For by interference user, in each subframe by the number of interference user according to from many to few sequence, the maximum subframe priority of number is the highest, as the ABS subframe of recommending; For by weak jamming user, in each subframe by the number of weak jamming user from many to few sequence, the maximum subframe priority of number is the highest, and conductively-closed is not as ABS subframe;
Macro base station, according to the priority of subframe, determines the subframe as almost empty frame ABS.
8. the system of semi-persistent scheduling in heterogeneous network according to claim 7, it is characterized in that, the priority of subframe is fed back in described micro-base station by the X2 interface between micro-base station and macro base station;
Described macro base station sends the subframe determined as ABS to micro-base station by X2 interface.
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| CN104158573B (en) * | 2014-07-01 | 2018-04-13 | 北京邮电大学 | Eliminate the method for precoding and system of interference |
| CN104202823B (en) * | 2014-07-09 | 2017-12-19 | 京信通信***（中国）有限公司 | A kind of configuration ABS method and device |
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| CN103096487A (en) | 2013-05-08 |
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