CN101426230B - Dividing method for adjacent sub-carrier distribution range of wideband wireless access system - Google Patents
Dividing method for adjacent sub-carrier distribution range of wideband wireless access system Download PDFInfo
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Abstract
The present invention discloses a method for dividing AMC Zone of broadband wireless access system, which comprises the following procedures: 1. differentiating the style of each MS in broadband wireless system to construct AMC MS array and PUSC MS array; and 2. determining the style of a first MS scheduled by an MS scheduling mode, and dividing AMC Zone according to the determined result. The technical plan according to the invention is introduced with a scheduling mode scheduled by MS. The dividing of AMC Zone can be realized without looking through the whole connection and only executing corresponding scheduling according to the physical property of MS at the condition that the scheduling resource can not be obtained beforehand.
Description
Technical field
The present invention relates to the division methods in a kind of Zone (zone), the division methods of especially a kind of BWA AMC (Adjacent Subcarrier Permutation, adjacent sub-carrier distributes) Zone.
Background technology
At present, the system of broadband wireless communication development is very fast, wireless access wide band technology relies on its small investment, instant effect, networking flexibility, be considered to solve the important means of broadband metropolitan area network construction " last kilometer ", allow Infobahn realize being open to traffic, wherein, more and more obtain people's extensive concern based on OFDM (Orthogonal Frequency-Division Multiplexing, the OFDM) multicarrier transmission systems of technology.
The ofdm system physical layer is supported sub-channelizing, can be divided into the experimental process channel to actual channel, because there is frequency selectivity in wireless channel, subcarrier that can not be all is in the deep decline situation simultaneously, therefore can make full use of the higher subchannel of signal to noise ratio by the method for dynamic subchannel distribution, adopt the higher-order modulation coded system, improve the system bandwidth throughput, thereby improve the performance of system.Two kinds of basic sub-carrier distribution manners in system, have been stipulated: distributed sub-carrier allocation and AMC.Distributed sub-carrier allocation comprises FUSC (FullUsage Subchannel uses subchannel fully) method and PUSC (Partial UsageSubchannel, part is used subchannel) method.In the distributed sub-carrier allocation mode, because subcarrier allocation in entire spectrum, the channel circumstance of very good or non-constant unlikely occurs; In the AMC mode, because subcarrier is continuous, might obtain high s/n ratio at indivedual subchannels, and for multi-user system, to an inapplicable subchannel of user concerning other users, may be the reasonable subchannel of performance, so MS (Mobile Station, terminal) can select as required, and the best channel of condition report for self.Under the AMC mode, a plurality of adjacent subcarriers are defined as a Band, so MS and BS (BaseStation, the base station) can apply for and distribute suitable Band according to result to the channel measurement of Band, 1 MS can report 5 signal to noise ratios than higher candidate Band, thereby uses the subchannel among the Band.
In order to adapt to dissimilar MS, in a frame structure, may comprise more than a kind of method of salary distribution in the ascending-descending subframes, may include PUSC, FUSC, optional FUSC, AMCZone etc.Every kind of method of salary distribution is all corresponding interval be called a Zone, but the control information of each frame of mandatory provision all must be placed on PUSC Zone, includes just the needs division AMC Zone of AMC data in the frame.
In all kinds of methods of salary distribution, AMC has its particularity.AMC is the function of physical layer, and is less to the service data scheduling influence, but the allocated bandwidth of physical layer is had considerable influence.Connect under the scheduling mode existing pressing, be to know the data volume of waiting for scheduling before the scheduling, be according to definite MAC (the Media Access Control that can send of the physical layer ability of available physical bandwidth and MS in the time of scheduling, MAC layer) carries out the scheduling of business datum after the quantity of layer data again, determine schedulable data volume according to the data volume of QoS (Quality of Service, service quality) parameter and wait scheduling then.Because scheduling is during AMC, MS can not use all subchannels, just can't determine schedulable band width in physical if the Zone of uncertain AMC is big or small before the scheduling of MAC layer, so just can carry out the scheduling of MAC layer data after will delimiting the size of AMC Zone.But MS can only use limited Band under the AMC mode, and the physical layer ability of each Band all might be different, Band divides on the frequency domain, Zone is on time domain, does not have can't know the data volume of AMC Zone before the scheduling, and then just can't divide AMC Zone.Be existingly to have contradiction between the division of the scheduling of AMC Zone and AMC Zone by connecting under the scheduling mode, can not be as other Zone while dispatching the size of change Zone.
Summary of the invention
The technical problem to be solved in the present invention is can't obtain to provide the division methods of a kind of BWA AMC Zone under the situation of scheduling resource in advance.
The technical solution adopted for the present invention to solve the technical problems is:
The division methods of a kind of BWA AMC Zone may further comprise the steps:
1.1 the type of distinguishing each MS in the described BWA is to make up AMC MS formation and PUSC MS formation;
1.2 judge the type of this frame, and divide AMC Zone operation accordingly according to the result who judges by first MS of MS scheduling mode scheduling.
In the such scheme, when the type of first MS of this frame scheduling is AMC, then all divide the bandwidth except that control channel in this frame into AMC Zone.
In the such scheme, after having drawn described AMC Zone, order according to described AMC MS formation, begin to carry out successively the scheduling of MS from described first MS, if the bandwidth of described AMC Zone has enough been dispatched the tail of the queue MS of described AMC MS formation successively, finish the scheduling of this frame after then having dispatched described tail of the queue MS, and first MS of next frame scheduling is changed to the next MS of last MS of the last scheduling of described PUSC MS formation.
In the such scheme, after having drawn described AMC Zone, order according to described AMC MS formation, begin to carry out successively the scheduling of MS from described first MS, if the bandwidth of described AMC Zone has been dispatched the tail of the queue MS of described AMC MS formation inadequately successively, the scheduling of this frame is finished in the intact back of the allocated bandwidth of then described AMC Zone, and first MS of next frame scheduling is changed to the next MS of last MS of described this scheduling of AMC MS formation.
In the such scheme, when the type of first MS of this frame scheduling is PUSC, then, begin to carry out successively the scheduling of MS from described first MS according to the order of described PUSC MS formation.
In the such scheme, when the MS in the described PUSC MS formation is dispatched successively, if still there is available bandwidth in this frame after having dispatched the tail of the queue MS of described PUSC MS formation successively, and described available bandwidth enough organizes a Zone again, then all divides described available bandwidth into AMC Zone; If described available bandwidth is organized a Zone inadequately again, then the head of the queue MS from described PUSC MS formation begins to carry out successively the scheduling of MS, after distributing described available bandwidth, finish the scheduling of this frame, and first MS of next frame scheduling is changed to the next MS of last MS of the last scheduling of described AMC MS formation.
In the such scheme, if described available bandwidth divides AMC Zone into, then the next MS from last last MS that dispatches of described AMC MS formation begins to carry out successively by the order of described adjacent sub-carrier distributing terminals formation the scheduling of MS, if the bandwidth of described AMC Zone has enough been dispatched the tail of the queue MS of described AMC MS formation successively, finish the scheduling of this frame after then having dispatched described tail of the queue MS, and first MS of next frame scheduling is changed to the head of the queue MS of described PUSC MS formation; Otherwise the scheduling of this frame is finished in the intact back of the allocated bandwidth of described AMC Zone, and first MS of next frame scheduling is changed to the next MS of last MS of described this scheduling of AMC MS formation.
In the such scheme, when the MS in the described PUSC MS formation is dispatched successively, if this frame bandwidth has been dispatched the tail of the queue MS of described PUSC MS formation inadequately successively, then the scheduling of this frame is finished in the intact back of this frame allocated bandwidth, and first MS of next frame scheduling is changed to the next MS of last MS of described this scheduling of PUSC MS formation.
In the such scheme, the type of described MS is to distinguish according to the method for salary distribution of the subcarrier of its physical attribute and support.
Beneficial effect of the present invention mainly shows: technical scheme provided by the invention has been introduced the scheduling mode by the MS scheduling, need not to travel through complete connects, only need to dispatch accordingly, promptly under the situation that can't obtain scheduling resource in advance, realized the division of AMCZone according to the physical attribute of MS.
Description of drawings
Fig. 1 is a division methods flow chart of the present invention;
Division operation flow chart when Fig. 2 is AMC MS for first MS of this frame scheduling;
Division operation flow chart when Fig. 3 is PUSC MS for first MS of this frame scheduling.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1, the division methods of a kind of BWA AMC Zone may further comprise the steps:
Step 101: the type of distinguishing each MS in the BWA to be to make up AMC MS formation and PUSC MS formation, and promptly the method for salary distribution according to the subcarrier of the physical attribute of each MS and support stores it into AMC MS formation and PUSC MS formation respectively; Can realize this step by the MS type judging module during practical operation;
Step 102: judge the type of this frame, and divide AMC Zone operation accordingly according to the result who judges by first MS of MS scheduling mode scheduling; Can realize the scheduling of MS during practical operation by the scheduler of pressing the MS scheduling, and divide the division operation that module realizes respective type Zone by Zone.
According to the type difference of first MS of this frame scheduling, the division operation of AMC Zone also has different processing modes, below just it is further described.
With reference to Fig. 2, if when first MS of this frame scheduling is AMC MS:
Step 201: all divide the bandwidth except that control channel in this frame into AMC Zone;
After the size of step 202:AMC Zone was determined, first MS of this frame scheduling began to carry out successively the scheduling of MS from AMC MS formation, comprises following two kinds of situations:
Situation one: if the bandwidth of AMC Zone has enough been dispatched the tail of the queue MS of AMC MS formation successively, finish the scheduling of this frame after then having dispatched the tail of the queue MS of AMC MS formation, and first MS of next frame scheduling is changed to the next MS of last MS of the last scheduling of PUSC MS formation;
Situation two: if the bandwidth of AMC Zone has been dispatched the tail of the queue MS of described AMC MS formation inadequately successively, then the scheduling of this frame is finished in the intact back of the allocated bandwidth of AMC Zone, and first MS of next frame scheduling is changed to the next MS of last MS of described this scheduling of AMC MS formation.
During practical operation, in scheduling process successively to MS, dispatch the preceding available bandwidth that calculates AMC Zone by bandwidth calculation module of a MS, if also there is available bandwidth in AMC Zone, then this MS is dispatched, when having dispatched this MS, judge whether this MS is the tail of the queue MS of AMC MS formation, if this MS is the tail of the queue MS of AMC MS formation, the bandwidth that then shows AMC Zone has enough been dispatched the tail of the queue MS of AMC MS formation successively, handle by the description in the situation one, otherwise, the next MS of this MS in the scheduling AMC MS formation; Assign if the result of bandwidth calculation is the available bandwidth of AMC Zone, show that then the bandwidth of AMC Zone has been dispatched the tail of the queue MS of AMC MS formation inadequately successively, handle by the description in the situation two.
With reference to Fig. 3, if when first MS of this frame scheduling is PUSC:
First MS of this frame scheduling begins to carry out successively the scheduling of MS from PUSC MS formation, comprises following three kinds of situations:
Situation one: when the MS in the PUSC MS formation was dispatched successively, if still there is available bandwidth in this frame after having dispatched the tail of the queue MS of PUSCMS formation successively, and this available bandwidth enough organized a Zone again, then all divides this available bandwidth into AMC Zone; After AMC Zone delimit, begin to carry out successively the scheduling of MS from the next MS of last last MS that dispatches of AMC MS formation by the order of AMC MS formation, if the bandwidth of AMC Zone has enough been dispatched the tail of the queue MS of AMCMS formation successively, finish the scheduling of this frame after then having dispatched tail of the queue MS, and first MS of next frame scheduling is changed to the head of the queue MS of PUSC MS formation; Otherwise the scheduling of this frame is finished in the intact back of the allocated bandwidth of AMC Zone, and first MS of next frame scheduling is changed to the next MS of last MS of this scheduling of AMC MS formation;
Situation two: when the MS in the PUSC MS formation is dispatched successively, still there is available bandwidth as if this frame behind the tail of the queue MS that has dispatched the PUSCMS formation successively, but this available bandwidth is organized a Zone inadequately again, then the head of the queue MS from PUSC MS formation begins to carry out successively the scheduling of MS, after distributing this available bandwidth, finish the scheduling of this frame, and first MS of next frame scheduling is changed to the next MS of last MS of the last scheduling of AMC MS formation;
Situation three: when the MS in the PUSC MS formation is dispatched successively, if this frame bandwidth has been dispatched the tail of the queue MS of PUSC MS formation inadequately successively, then the scheduling of this frame is finished in the intact back of this frame allocated bandwidth, and first MS of next frame scheduling is changed to the next MS of last MS of this scheduling of PUSC MS formation.
During practical operation, in scheduling process successively to MS, dispatch the preceding available bandwidth that calculates this frame by bandwidth calculation module of a MS, if also there is available bandwidth in this frame, then this MS is dispatched, when having dispatched this MS, judge whether this MS is the tail of the queue MS of PUSC MS formation, if this MS is the tail of the queue MS of PUSC MS formation, then show the enough tail of the queue MS of PUSC MS formation that dispatched successively of this frame bandwidth, handle by the description in situation one or the situation two, otherwise, the next MS of this MS in the scheduling PUSC MS formation; Assign if the result of bandwidth calculation is the available bandwidth of this frame, show that then this frame bandwidth dispatched the tail of the queue MS of PUSC MS formation inadequately successively, handle by the description in the situation three.
When this frame scheduling finishes, the information of the MS of next frame scheduling can be stored by the schedule information module, the information in the schedule information module of reading when carrying out next frame scheduling can be determined the type of first MS of dispatching, and then divides AMC Zone operation accordingly according to said method again.On long terms, said method can be divided Zone according to the data volume of AMC substantially, has solved the difficult point of under the situation that can't obtain scheduling resource in advance AMC Zone being divided.
Claims (7)
1. the division methods of a BWA adjacent sub-carrier range of distribution is characterized in that, may further comprise the steps:
1.1 the type of distinguishing each terminal in the described BWA is to make up adjacent sub-carrier distributing terminals formation and partly to use the subchannel terminal queue;
1.2 judge the type of first terminal that this frame is dispatched by the terminal scheduling mode, and carry out the division of adjacent sub-carrier range of distribution in the following manner according to the result who judges, described mode is specially:
If the type of first terminal of this frame scheduling is that adjacent sub-carrier divides timing, then all divide the bandwidth except that control channel in this frame into the adjacent sub-carrier range of distribution;
When if the type of first terminal of this frame scheduling is used subchannel for part, then use the order of subchannel terminal queue according to described part, begin to carry out successively the scheduling of terminal from described first terminal.
2. the division methods of BWA adjacent sub-carrier as claimed in claim 1 range of distribution, it is characterized in that: after having drawn described adjacent sub-carrier range of distribution, order according to the formation of described adjacent sub-carrier distributing terminals, begin to carry out successively the scheduling of terminal from described first terminal, if the bandwidth of described adjacent sub-carrier range of distribution has enough been dispatched the tail of the queue terminal of described adjacent sub-carrier distributing terminals formation successively, finish the scheduling of this frame after then having dispatched described tail of the queue terminal, and first terminal of next frame scheduling is changed to the next terminal of last terminal of the last scheduling of described part use subchannel terminal queue.
3. the division methods of BWA adjacent sub-carrier as claimed in claim 1 range of distribution, it is characterized in that: after having drawn described adjacent sub-carrier range of distribution, order according to the formation of described adjacent sub-carrier distributing terminals, begin to carry out successively the scheduling of terminal from described first terminal, if the bandwidth of described adjacent sub-carrier range of distribution has been dispatched the tail of the queue terminal of described adjacent sub-carrier distributing terminals formation inadequately successively, the scheduling of this frame is finished in the intact back of the allocated bandwidth of then described adjacent sub-carrier range of distribution, and first terminal of next frame scheduling is changed to the next terminal of last terminal of described this scheduling of adjacent sub-carrier distributing terminals formation.
4. the division methods of BWA adjacent sub-carrier as claimed in claim 1 range of distribution, it is characterized in that: when the terminal in the terminal queue of described part use subchannel is dispatched successively, still there is available bandwidth as if this frame after the tail of the queue terminal of having dispatched the terminal queue of described part use subchannel successively, and described available bandwidth is enough organized a zone again, then all divides described available bandwidth into the adjacent sub-carrier range of distribution; If described available bandwidth is organized a zone inadequately again, then use the head of the queue terminal of subchannel terminal queue to begin to carry out successively the scheduling of terminal from described part, after distributing described available bandwidth, finish the scheduling of this frame, and first terminal of next frame scheduling is changed to the next terminal of last terminal of the last scheduling of described adjacent sub-carrier distributing terminals formation.
5. the division methods of BWA adjacent sub-carrier as claimed in claim 4 range of distribution, it is characterized in that: if described available bandwidth divides the adjacent sub-carrier range of distribution into, then the next terminal from last last terminal of dispatching of described adjacent sub-carrier distributing terminals formation begins to carry out successively by the order of described adjacent sub-carrier distributing terminals formation the scheduling of terminal, if the bandwidth of described adjacent sub-carrier range of distribution has enough been dispatched the tail of the queue terminal of described adjacent sub-carrier distributing terminals formation successively, finish the scheduling of this frame after then having dispatched described tail of the queue terminal, and first terminal of next frame scheduling is changed to the head of the queue terminal of described part use subchannel terminal queue; Otherwise the scheduling of this frame is finished in the intact back of the allocated bandwidth of described adjacent sub-carrier range of distribution, and first terminal of next frame scheduling is changed to the next terminal of last terminal of described this scheduling of adjacent sub-carrier distributing terminals formation.
6. the division methods of BWA adjacent sub-carrier as claimed in claim 1 range of distribution, it is characterized in that: when the terminal in the terminal queue of described part use subchannel is dispatched successively, if this frame bandwidth has been dispatched the tail of the queue terminal that described part is used the subchannel terminal queue inadequately successively, then the scheduling of this frame is finished in the intact back of this frame allocated bandwidth, and first terminal of next frame scheduling is changed to the next terminal that described part is used last terminal of this scheduling of subchannel terminal queue.
7. as the division methods of one of them described BWA adjacent sub-carrier range of distribution of claim 1 to 6, it is characterized in that: the type of described terminal is to distinguish according to the method for salary distribution of the subcarrier of its physical attribute and support.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1930801A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| CN1949753A (en) * | 2005-10-14 | 2007-04-18 | 华为技术有限公司 | Method and apparatus for pilot frequency distribution in wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1930801A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| CN1949753A (en) * | 2005-10-14 | 2007-04-18 | 华为技术有限公司 | Method and apparatus for pilot frequency distribution in wireless communication system |
Non-Patent Citations (1)
| Title |
|---|
| 刘光毅等.WiMAX系统中导频和信道估计.《中兴通讯技术》.2007,第13卷(第5期),48-52. * |
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