CN102547997B - The method and apparatus of adaptive scheduling is carried out in a wireless communication system based on interference - Google Patents
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Abstract
The present invention relates to a kind of method and apparatus carrying out adaptive scheduling in a wireless communication system based on interference.Wherein, equipment after the interference variations information obtaining each Resource Block, then comes adaptively for this Resource Block selects corresponding scheduling strategy according to described interference variations information.Advantage of the present invention comprises: can adopt different scheduling and resource allocation policy according to disturbance rate of change.
Description
Technical field
The present invention relates to wireless communication system, particularly relate to the method and apparatus carrying out adaptive scheduling in a wireless communication system based on interference.
Background technology
Common-channel interference is a significant challenge faced by radio honeycomb communication system.Channel disturbance from neighbor cell not only reduces the performance of physical layer, also can affect the link circuit self-adapting of OFDMA system, Resourse Distribute and user scheduling simultaneously.This is because time become channel disturbance the channel quality from user side can be caused to indicate (CQI) inaccurate.So in this case, the performance of a community depends on the dispatch situation of its neighbor cell.
Such as, in the OFDMA network of a non-full load, the position of unappropriated subcarrier changes along with dispatch situation, and this just makes interference also and then change accordingly.Another example is in beam forming network, and all communities use the specific dynamic beam figuration of user to carry out communicating downlink data.The subscriber equipment be scheduled is depended in the direction of wave beam, if having chosen a different subscriber equipment, so interference will change.In above two examples, swiftness due to interference variations, makes base station (eNB) be difficult to accurately estimate the quality of wireless channel of interference user.This greatly reduces He Ne laser scheduling, and link circuit self-adapting needs the gain of the technology of channel condition information with other.
In order to solve the problem, in the X2 interface in LTE system, define the parameter of relative arrowband transmitted power (RNTP) by name, as interactive interference information between help base station to help the mark of cooperation.RNTP provides the instruction of each Resource Block (PRB) descending power restriction in the cell.RNTP comprises a threshold value and corresponds to a bitmap (bitmap) of each PRB, and the bit1 in bitmap represents that the maximum transmission power on this PRB will exceed the threshold value in RNTP in considered future time period.
Based on the RNTP received from neighbor cell, downlink scheduler distributes to the subband of Cell Edge User compared with minor interference.But, the maximum transmission power of each Resource Block of RNTP only just in considered future time intervals, it does not indicate interference to be fast change or becomes slowly, therefore, the impact that scheduler can not take adaptive strategy to bring to the interference managing different rate of change, cannot use more effective policy in resource management.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus carrying out adaptive scheduling in a wireless communication system based on interference.
According to an aspect of the present invention, provide a kind of method of carrying out adaptive scheduling in a wireless communication system based on interference variations speed, wherein, the method comprises the following steps:
A obtains the interference variations information of each Resource Block;
B comes adaptively for each Resource Block selects corresponding scheduling strategy according to each interference variations information.
According to another aspect of the present invention, additionally provide a kind of equipment carrying out adaptive scheduling in a wireless communication system based on interference variations speed, wherein, comprising:
Acquisition device, for obtaining the interference variations information of each Resource Block;
Dispatching device, for coming adaptively for each Resource Block selects corresponding scheduling strategy according to each interference variations information.
Compared with prior art, the present invention has the following advantages: can adopt different scheduling and resource allocation policy according to disturbance rate of change.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is wireless communication system topology figure of the present invention;
Fig. 2 is the flow chart carrying out the method for adaptive scheduling based on interference variations speed of one aspect of the invention;
Fig. 3 is the flow chart carrying out the method for adaptive scheduling based on interference variations speed of another aspect of the present invention;
Fig. 4 is the system schematic of carrying out adaptive scheduling based on interference variations speed of one aspect of the invention;
Fig. 5 is the system schematic of carrying out adaptive scheduling based on interference variations speed of another aspect of the present invention;
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is wireless communication system topology figure of the present invention.Described wireless communication system comprises multiple community, is provided with a communication apparatus in each community.For simplicity of illustration, 7 communities are only shown in figure, i.e. community 1, community 2, community 3, community 4, community 5, community 6 and community 7.Wherein, be provided with in community 1 in equipment 1, community 2 to be provided with in equipment 2, community 3 to be provided with in equipment 3, community 4 to be provided with in equipment 4, community 5 to be provided with in equipment 5, community 6 to be provided with in equipment 6, community 7 and be provided with equipment 7, the equipment between neighbor cell can intercom mutually.Such as, community 7 and community 1, community 2, community 3, community 4, community 5, community 6 are adjacent, therefore described equipment 7 can intercom mutually with described equipment 1, equipment 2, equipment 3, equipment 4, equipment 5 and equipment 6; Again such as, community 3 and community 2, community 4, community 7 are adjacent, therefore equipment 3 can intercom with equipment 3, equipment 4 and equipment 7 phase.
Described wireless communication system include but not limited to into: based on the radio honeycomb communication system of OFDMA.Described equipment 1, equipment 2, equipment 3, equipment 4, equipment 5, equipment 6 and equipment 7 include but not limited to: base station, e-NodeB or network controller etc.Such as, but it should be appreciated by those skilled in the art that described wireless communication system is not limited with described, can also be the radio honeycomb communication system etc. based on TDMA.
Fig. 2 is the flow chart carrying out the method for adaptive scheduling based on interference variations speed of one aspect of the invention.
Concrete, in step S01, equipment respective in each community obtains the interference variations information of each Resource Block respectively.Wherein, described Resource Block, for the wireless communication system based on OFDMA, it is communicator frequency band; For the wireless communication system based on TDMA, it is communication time slot.Such as, the equipment 3 of the equipment 1 of community 1, the equipment 2 of community 2, community 3, the equipment 4 of community 4, the equipment 6 of community 5, the equipment 6 of community 6, the equipment 7 of community 7, obtain the interference variations information of each communicator frequency band or communication time slot respectively.
Then, in step S02, each equipment comes adaptively for each Resource Block selects corresponding scheduling strategy according to the interference variations information obtained separately respectively.
Fig. 3 is the flow chart carrying out the method for adaptive scheduling based on interference variations speed of another aspect of the present invention.
Concrete, in step S011, equipment respective in each community receives the interference variations indication information from neighbor cell respectively.Such as, the equipment 7 in community 7 receives from neighbor cell, such as: the interference variations indication information of each equipment in community 1, community 2, community 3, community 4, community 5 and community 6.
As a kind of optimal way, the interference variations indication information from neighbor cell can represent with a bitmap.The corresponding kth sub-band of a kth bit in bitmap, value " 1 " represents that current sub-band transmitted power or direction are fast-changing, and value " 0 " represents that transmitted power or direction change at a slow speed.Wherein, for the wireless communication system adopting 3GPPLTE agreement, bitmap can be defined as a new information variable, and such as, be referred to as narrow emission change instruction (NTVI), thus, described bitmap just transmits by X2 interface.
But those skilled in the art should understand that, the mode that equipment in community obtains interference variations indication information is not with being limited alternately between the respective equipment in neighbor cell, in fact, also forward by miscellaneous equipment and obtain, such as, first can be collected the interference variations indication information of each community by the network controller arranged in a wireless communication system, be forwarded to each equipment etc. more subsequently.In addition, interference variations indication information is not represent with bitmap to be limited yet.
Then, in step S012, each equipment is respectively by the interference variations information extracting each Resource Block described in the interference variations indication information received separately.Such as, the 1st is obtained in the bitmap that receives of described equipment 1, equipment 2, equipment 3, equipment 4, equipment 5, equipment 6 and each freedom of equipment 7 to the interference variations information of K Resource Block.0,1,1......0 such as, the obtain in the bitmap of described equipment 1 by the neighbor cell 2 received the 1st to the interference variations information of K Resource Block is:; 1,0,1......0 obtain in bitmap by the neighbor cell 6 received the 1st to the interference variations information of K Resource Block is:; 0,0,1......0 obtain in bitmap by the neighbor cell 7 received the 1st to the interference variations information of K Resource Block is:.In addition, miscellaneous equipment also, can be illustrated to the interference variations information of K Resource Block at this by acquisition the 1st in respective received bitmap no longer one by one.
Then, in step S02, each equipment comes adaptively for each Resource Block selects corresponding scheduling strategy according to each interference variations information again.
As a kind of optimal way, when interference variations information indicates a Resource Block interference variations quick, then equipment with frequency diversity scheduling strategy to this Resource Block operation dispatching; And when described interference variations information indicates a Resource Block interference variations at a slow speed, then equipment with frequency selective scheduling strategy to this Resource Block operation dispatching.
Such as, each equipment available flag ScdModeFlag identifies each sub-band, and the sub-band being masked as 1 expression correspondence is for frequency diversity scheduling strategy, otherwise corresponding sub-band is for He Ne laser scheduling strategy.If what an equipment received is (k, i) from the kth bit in the interference variations information of cell i, the ScdModeFlag of a kth sub-band can be calculated as follows:
ScdModeFlag(k)＝F1({BitMap(k，i)}i＝1...N)
N is the quantity of neighbor cell, and F1 represents the acquisition function of ScdModeFlag, has many methods can computing function F1, includes but not limited to:
1) bit OR operation: if there is the corresponding bit of any one neighbor cell to be set to 1, so F1 is 1.
2) majority vote: if the quantity that the quantity of 1 is greater than 0, F1 is 1, otherwise F1 is 0.
3) power weightings majority vote; Relative arrowband transmitted power (RNTP) value being the sub-band of 1 all values in interference variations bitmap is added, then is the RNTP value addition of the sub-band of 0 by all values in interference variations bitmap, two values is compared, if the former is large, F1 is 1, if the latter is large, F1 is 0.
Thus, each equipment is dispatched corresponding Resource Block according to respective mark ScdModeFlag.Such as, for equipment 1, the mark ScdModeFlag of its 1st Resource Block calculated is 1, then equipment 1 is dispatched the 1st Resource Block with frequency diversity scheduling strategy; And the it calculates the 2nd Resource Block mark ScdModeFlag be 0, then equipment 1 is dispatched the 2nd Resource Block with He Ne laser scheduling strategy; For the scheduling of other Resource Block, also adopt similar fashion, describe in detail no longer one by one at this.And miscellaneous equipment to the scheduling of respective Resource Block and the scheduling mode of equipment 1 to its Resource Block similar, also describe in detail no longer one by one at this.
As another kind of optimal way, when described interference variations information indicates a Resource Block interference variations quick, then equipment utilization broadband CQI and frequency diversity scheduling strategy are to this Resource Block operation dispatching and link circuit self-adapting; And when described interference variations information indicates a Resource Block interference variations at a slow speed, then equipment utilization sub-band CQI and frequency selective scheduling strategy are to this Resource Block operation dispatching and link circuit self-adapting.
Such as, with ScdModeFlag (k)=1, equipment can represent that sub-band k may be used for frequency diversity scheduling, the dispatched users of sub-band k can be expressed as:
ScdUser(k)＝F2()，
Many methods can be had to obtain function F 2 (), include but not limited to; Make function F 2 () from all available subscribers equipment, return a random user index value.
Accordingly, with ScdModeFlag (k)=0, equipment can represent that sub-band k is not useable for frequency diversity scheduling for frequency selective scheduling; The scheduling user's set of sub-band k can be expressed as:
ScdUser(k)＝F3({Metricu}u＝1...U)
Wherein, U represents the quantity of available subscribers equipment.Equipment distributes to the sub-band that subscriber equipment one has maximum metric.Metric depends on concrete dispatching algorithm.
In addition, equipment can indicate determining modulation encoding scheme (MCS) based on CQI:
MCS(u)＝F4(WidebandCQI(u))
F4 is the mapping function of a channel quality instruction-Modulation and Coding Scheme (CQI-MCS), and mapping table can be obtained by emulation and experiment test.
Accordingly, equipment can determine MCS based on sub-band CQI:
MCS(u)＝F5({SubbandCQI(u，k)}k∈SubbandSet(u))，
SubbandSet (u) represents the set distributing to the sub-band of subscriber equipment U.An available solutions of function F 5 adopts averaging method (such as on the sub-band of all distribution, EESM) obtain effective Signal to Interference plus Noise Ratio (SINR), then use Signal to Interference plus Noise Ratio-Modulation and Coding Scheme mapping function to obtain Modulation and Coding Scheme.
Fig. 4 is the system schematic of carrying out adaptive scheduling based on interference variations speed of one aspect of the invention.Wherein, described equipment 1 comprises acquisition device 11 and dispatching device 12.
Concrete, in step S01, acquisition device 11 obtains the interference variations information of each Resource Block.Wherein, described Resource Block, for the wireless communication system based on OFDMA, it is communicator frequency band; For the wireless communication system based on TDMA, it is communication time slot.Such as, acquisition device 11 obtains the interference variations information of each communicator frequency band or communication time slot.
Then, dispatching device 12 comes adaptively for each Resource Block selects corresponding scheduling strategy according to obtained interference variations information.
Fig. 5 is the system schematic of carrying out adaptive scheduling based on interference variations speed of another aspect of the present invention.Wherein, described equipment 1 comprises acquisition device 11 and dispatching device 12; Described acquisition device comprises: receiving system 111 and extraction element 112.
Concrete, in step S011, receiving system 111 receives the interference variations indication information from neighbor cell.Such as, receiving system 111 receives from neighbor cell, such as: the interference variations indication information of each equipment in community 2, community 6 and community 7.
As a kind of optimal way, the interference variations indication information from neighbor cell can represent with a bitmap.The corresponding kth sub-band of a kth bit in bitmap, value " 1 " represents that current sub-band transmitted power or direction are fast-changing, and value " 0 " represents that transmitted power or direction change at a slow speed.Wherein, for the wireless communication system adopting 3GPPLTE agreement, bitmap can be defined as a new information variable, and such as, be referred to as narrow emission change instruction (NTVI), thus, described bitmap just transmits by X2 interface.
But those skilled in the art should understand that, the mode that receiving system 111 obtains interference variations indication information is not limited with the transmission of the equipment of neighbor cell, in fact, also forward by miscellaneous equipment and obtain, such as, first can be collected the interference variations indication information of each community by the network controller arranged in a wireless communication system, be forwarded to receiving system 111 subsequently again and receive.In addition, interference variations indication information is not represent with bitmap to be limited yet.
Then, extraction element 112 is by the interference variations information extracting each Resource Block described in the interference variations indication information received.0,1,1......0 such as, the obtain in the bitmap of described extraction element 112 by the neighbor cell 2 received the 1st to the interference variations information of K Resource Block is:; 1,0,1......0 obtain in bitmap by the neighbor cell 6 received the 1st to the interference variations information of K Resource Block is:; 0,0,1......0 obtain in bitmap by the neighbor cell 7 received the 1st to the interference variations information of K Resource Block is:.
Then, dispatching device 12 comes adaptively for each Resource Block selects corresponding scheduling strategy according to each interference variations information again.
As a kind of optimal way, when interference variations information indicates a Resource Block interference variations quick, then dispatching device 12 with frequency diversity scheduling strategy to this Resource Block operation dispatching; And when described interference variations information indicates a Resource Block interference variations at a slow speed, then dispatching device 12 with frequency selective scheduling strategy to this Resource Block operation dispatching.
Such as, dispatching device 12 available flag ScdModeFlag identifies each sub-band, and the sub-band being masked as 1 expression correspondence is for frequency diversity scheduling strategy, otherwise corresponding sub-band is for He Ne laser scheduling strategy.If what dispatching device 12 received is (k, i) from the kth bit in the interference variations information of cell i, a kth sub-band
ScdModeFlag can be calculated as follows:
ScdModeFlag(k)＝F1({BitMap(k，i)}i＝1...N)
N is the quantity of neighbor cell, and F1 represents the acquisition function of ScdModeFlag, has many methods can computing function F1, includes but not limited to:
1) bit OR operation: if there is the corresponding bit of any one neighbor cell to be set to 1, so F1 is set to 1.
2) majority vote: if the quantity that the quantity of 1 is greater than 0, F1 is 1, otherwise F1 is 0.
3) power weightings majority vote; Relative arrowband transmitted power (RNTP) value being the sub-band of 1 all values in interference variations bitmap is added, then is the RNTP value addition of the sub-band of 0 by all values in interference variations bitmap, two values is compared, if the former is large, F1 is 1, if the latter is large, F1 is 0.
Thus, dispatching device 12 is dispatched corresponding Resource Block according to respective mark ScdModeFlag.Such as, the mark ScdModeFlag of the 1st Resource Block that dispatching device 12 calculates is 1, then dispatching device 12 is dispatched the 1st Resource Block with frequency diversity scheduling strategy; And if the calculate the 2nd Resource Block mark ScdModeFlag be 0, then dispatching device 12 is dispatched the 2nd Resource Block with He Ne laser scheduling strategy; For the scheduling of other Resource Block, also adopt similar fashion, describe in detail no longer one by one at this.
As another kind of optimal way, when described interference variations information indicates a Resource Block interference variations quick, then dispatching device 12 utilizes broadband CQI and frequency diversity scheduling strategy to this Resource Block operation dispatching and link circuit self-adapting; And when described interference variations information indicates a Resource Block interference variations at a slow speed, then dispatching device 12 utilizes sub-band CQI and frequency selective scheduling strategy to this Resource Block operation dispatching and link circuit self-adapting.
Such as, with ScdModeFlag (k)=1, dispatching device 12 can represent that sub-band k may be used for frequency diversity scheduling, the dispatched users of sub-band k can be expressed as:
ScdUser(k)＝F2()，
Many methods can be had to obtain function F 2 (), include but not limited to; Make function F 2 () from all available subscribers equipment, return a random user index value.
Accordingly, with ScdModeFlag (k)=0, dispatching device 12 can represent that sub-band k is not useable for frequency diversity scheduling for frequency selective scheduling; The scheduling user's set of sub-band k can be expressed as:
ScdUser(k)＝F3({Metricu}u＝1...U)
Wherein, U represents the quantity of available subscribers equipment.Equipment distributes to the sub-band that subscriber equipment one has maximum metric.Metric depends on concrete dispatching algorithm.
In addition, dispatching device 12 can indicate determining modulation encoding scheme (MCS) based on CQI:
MCS(u)＝F4(WidebandCQI(u))
F4 is the mapping function of a channel quality instruction-Modulation and Coding Scheme (CQI-MCS), and mapping table can be obtained by emulation and experiment test.
Accordingly, dispatching device 12 can determine MCS based on sub-band CQI:
MCS (u)=F5 ({ SubbandCQI (u, k) } k ∈ SubbandSet (u)), SubbandSet (u) represent the set distributing to the sub-band of subscriber equipment U.An available solutions of function F 5 adopts averaging method (such as on the sub-band of all distribution, EESM) obtain effective Signal to Interference plus Noise Ratio (SINR), then use Signal to Interference plus Noise Ratio-Modulation and Coding Scheme mapping function to obtain Modulation and Coding Scheme.
Below be only described in detail for equipment 1, but it should be appreciated by those skilled in the art that other equipment, such as, equipment 2, equipment 3, equipment 4, equipment 5, equipment 6 and equipment 7, structure all identical with the structure of equipment 1, at this, describe in detail no longer one by one.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in system claims or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.
Claims (8)
1. carry out a method for adaptive scheduling in a wireless communication system based on interference variations speed, wherein, the method comprises the following steps:
A obtains the interference variations information of each Resource Block;
-when described interference variations information indicates a Resource Block interference variations quick, then with frequency diversity scheduling strategy to this Resource Block operation dispatching;
-when described interference variations information indicates a Resource Block interference variations at a slow speed, then with frequency selective scheduling strategy to this Resource Block operation dispatching.
2. method according to claim 1, wherein, described step a also comprises:
-receive interference variations indication information from neighbor cell;
-by the interference variations information extracting each Resource Block described in described interference variations indication information.
3. method according to claim 1, wherein,
-when described interference variations information indicates a Resource Block interference variations quick, also utilize broadband CQI to perform link circuit self-adapting to this Resource Block;
-when described interference variations information indicates a Resource Block interference variations at a slow speed, then also utilize sub-band CQI to perform link circuit self-adapting to this Resource Block.
4. according to the method in any one of claims 1 to 3, wherein, described wireless communication system comprises the radio honeycomb communication system based on OFDMA.
5. carry out an equipment for adaptive scheduling in a wireless communication system based on interference variations speed, wherein, comprising:
Acquisition device, for obtaining the interference variations information of each Resource Block;
Dispatching device, for:
-when described interference variations information indicates a Resource Block interference variations quick, then with frequency diversity scheduling strategy to this Resource Block operation dispatching;
-when described interference variations information indicates a Resource Block interference variations at a slow speed, then with frequency selective scheduling strategy to this Resource Block operation dispatching.
6. equipment according to claim 5, wherein, described acquisition device also comprises:
Receiving system, for receiving the interference variations indication information from neighbor cell;
Extraction element, for the interference variations information of each Resource Block described in extracting in described interference variations indication information.
7. equipment according to claim 5, wherein, described dispatching device also for:
-when described interference variations information indicates a Resource Block interference variations quick, utilize broadband CQI to perform link circuit self-adapting to this Resource Block;
-when described interference variations information indicates a Resource Block interference variations at a slow speed, utilize sub-band CQI to perform link circuit self-adapting to this Resource Block.
8. the equipment according to any one of claim 5 to 7, wherein, described wireless communication system comprises the radio honeycomb communication system based on OFDMA, and described equipment comprises base station, e-NodeB or network controller.
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| CN101512991A (en) * | 2006-09-08 | 2009-08-19 | 高通股份有限公司 | A method and apparatus for fast other sector interference (OSI) adjustment |
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