CN101383655A - Wireless resource block offset selection method based feedback - Google Patents
Wireless resource block offset selection method based feedback Download PDFInfo
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Abstract
The invention discloses a choosing method based on the feedback radio resource block offset, which is applied to an orthogonal frequency division multiplexing system and is used for a sender to change the radio resource allocation in a radio resource block according to the offset information fedback by a receiver. The choosing method is characterized in that: after the offset concentration is determined, the receiver obtains all or one part of offset in the offset concentration based on the channel quality index number information of the channel quality test value of the radio resource block; the receiver feeds back one part of or all offset information for the sender according to the channel quality index number information; the sender chooses one offset according to one part of or all offset information. The invention realizes the purpose that that the sender changes radio resource allocation in one part of or all radio resource blocks according to one part of or all offset information fed back by the receiver.
Description
Technical field
The present invention relates to the access technology in the communication system, relate in particular to a kind of wireless resource block offset selection method based on feedback.
Background technology
Along with the evolution of cellular system, OFDMA (Orthogonal Frequency Division MultipleAccess, OFDM inserts) system becomes the mainstream technology of following wide-band mobile communication gradually.OFDM (Orthogonal Frequency Division Multiplexing, OFDM) core concept of system is, utilize IFFT (invert fast fourier transformation) with data stream modulates on a plurality of subcarriers (sub-carrier), frequency response to channel is cut apart, and makes it to become parallel, independent approximate memoryless a plurality of subchannels.Therefore, the basic Radio Resource of ofdm system is frequency and time (or time interval), if matching coding technology and multi-antenna technology, ofdm system can also obtain extra code source or space resources, utilize the OFDM orthogonal time frequency resources to obtain the multiple access transmittability, this system is the OFDMA system.
Reducing expense is the important means that wireless communication system obtains higher spectrum efficiency, same subcarrier frequency at interval down, system bandwidth is big more, sub-carrier number is many more, the expense of transmitting assigned subcarrier for multiple access is just big more, simultaneously, on the one hand, once transmit the big data of trying one's best, can reduce overhead, on the other hand, the data length of most of business is not what fix, therefore the design resource piece makes it to carry the business of smaller length, simultaneously a plurality of Resource Block combinations can be transmitted the business than length, is very important.For example a RB of definition (ResourceBlock, Resource Block) comprises 12 subcarriers and the 1ms time interval in LTE (Long Term Evolution, Long Term Evolution) system, and the sub-carrier configuration among the RB is changeless.
In order to improve the availability of frequency spectrum, wireless communication system can adopt Adaptive Modulation and Coding scheme (MCS) according to channel condition, MCS normally classifies and is limited, base station and terminal can adopt a plurality of RB to transmit a TB (transport block, data block), in order to reduce notification overhead, different RB adopts identical MCS in the TB.When the sub-carrier configuration among the RB of system immobilizes, because in most cases its channel has frequency selection and time selectivity, and the resource that TB takies is the local channel resource, and is then not necessarily optimum for the MCS of TB distribution, thereby causes the availability of frequency spectrum to descend.
Summary of the invention
Technical problem to be solved by this invention is to be to provide a kind of wireless resource block offset selection method based on feedback, changes radio-resource-configuration in the wireless resource block in order to transmit leg according to the offset information of recipient's feedback.
In order to solve the problems of the technologies described above, the invention provides a kind of wireless resource block offset selection method based on feedback, be applied to ofdm system, comprising:
(1) determine side-play amount set after, the recipient obtains in the described side-play amount set under all or part of side-play amount quality index of a channel information based on the channel quality test value of described wireless resource block;
(2) described recipient according to described quality index of a channel information to transmit leg feedback fraction or whole offset information;
(3) described transmit leg is selected a side-play amount according to described part or all of offset information.
In the said method, described wireless resource block can comprise: running time-frequency resource, one or whole combinations in running time-frequency resource and code source or the space resources.
In the said method step (1), described definite side-play amount set can comprise according to the radio-resource-configuration attribute in the described wireless resource block and determining.
Further, described radio-resource-configuration attribute is the radio-resource-configuration mode in the described wireless resource block, can comprise:
Mode one, the described wireless resource block configuration of all of ofdm system is identical;
Mode two, the described wireless resource block configuration of ofdm system is different.
Further, according to the radio-resource-configuration attribute in the described wireless resource block, determine that described side-play amount set can comprise:
Radio-resource-configuration mode in the described wireless resource block be described mode for the moment, select part or all of side-play amount among 0～A-1 as the element in the described side-play amount set, wherein, A is the sub-carrier number in the described wireless resource block; And
When the radio-resource-configuration mode in the described wireless resource block is described mode two, select part or all of side-play amount among 0～B-1 as the element in the described side-play amount set, wherein, B is the total number of sub-carriers in the ofdm system.
In the said method, described step (2) can comprise:
(21) described recipient adds up in the set of described side-play amount partly or entirely under the side-play amount, the channel quality test value of described wireless resource block;
(22) described recipient calculates under the described part or all of side-play amount, based on the described quality index of a channel information of the channel quality test value of described wireless resource block.
Further, quality index of a channel information described in the step (22) can comprise quantized value or statistical value to described channel quality test value, and the positional information of the described wireless resource block corresponding with described quantized value or statistical value.
In the said method step (2), described recipient can preferably partly or with whole side-play amounts feed back to described transmit leg according to the side-play amount selection strategy.
In the said method step (2), described offset information can for following any:
Side-play amount;
Side-play amount and corresponding quality index of a channel information;
Side-play amount set and corresponding quality index of a channel ensemble of communication;
Side-play amount and corresponding channel quality test value;
Side-play amount set and corresponding channel quality test value set.
In the said method step (3), described transmit leg can be selected a described side-play amount according to predetermined side-play amount selection principle.
In the said method step (3), described transmit leg can cycle or the described side-play amount of ground selection aperiodic.
Said method may further include:
(4) described transmit leg changes radio-resource-configuration in the part or all of described wireless resource block according to selected described side-play amount.
By technique scheme of the present invention, realized the part or all of offset information of transmit leg according to recipient's feedback, select a side-play amount to be used for changing the purpose of the radio-resource-configuration in the part or all of described wireless resource block, and then improved the throughput of system transmissions.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is based on the flow chart of the method for dynamic regulation of wireless resource block configuration of side-play amount;
Fig. 2 is the flow chart that the present invention is based on the wireless resource block offset selection method embodiment of feedback;
Fig. 3 is the flow chart of the example of method shown in Figure 2; And
Fig. 4 is the flow chart of the example 2 of method shown in Figure 1.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Relate to wireless resource block (RB) among the present invention, below will at first be described in detail RB.
(1) RB can be divided into two classes by configuration
Radio-resource-configuration mode in the wireless resource block comprises following two kinds: mode one, and all wireless resource block configurations of ofdm system are identical; Mode two, the wireless resource block configuration of ofdm system is different.Correspondingly, RB can be divided into two classes by configuration: the wireless resource block configuration of all ofdm systems in the first kind wireless resource block is identical, promptly adopt above-mentioned mode one, that is to say, the wireless resource block of ofdm system running time-frequency resource at least has only a kind of size configure, sub-carrier number among the different RB is the same, and the OFDM symbolic number that comprises also is the same; The wireless resource block configuration of the ofdm system in the second class wireless resource block is different, promptly adopts above-mentioned mode two.
(2) RB distributes by subcarrier and can be divided into two classes
Centralized RB:, claim that then this RB is centralized RB if the sub-carrier frequencies among the RB is continuous;
Distributed RB: the RB except that centralized RB.
(3) RB is divided into two classes according to pattern
Dynamic RB: dynamically the subcarrier composition that comprises among the RB is variable;
Static RB: the subcarrier composition that comprises among the static RB is immutable.
(4) RB is according to attributive classification
Logic (or virtual) RB: the subcarrier that comprises in this RB is virtual, and the logical sub carrier index is continuous, and the logical sub carrier wave is always constant in particular number RB;
Physics RB: what comprise in this RB is physical sub-carrier, and the physical sub-carrier numbering is not necessarily continuous among the RB of particular number, and physical sub-carrier can be always constant in particular number RB, also can change.
Wherein, there are specific mapping relations in logical sub carrier index and physical sub-carrier among logic (or virtual) RB, and under the different side-play amounts, these mapping relations can be the same or different.
In addition, the transmit leg of hereinafter mentioning can be BS (Base Station, base station) or AP (AccessPoint, access point), and the recipient can be UE (User Equipment, a terminal).
Based on above content, as shown in Figure 1, comprise following processing based on the RB of side-play amount configuration dynamic adjusting method:
Below will specifically describe each details in the above-mentioned processing.
At first, the RB of above-mentioned ofdm system refers to time-frequency (being the time or the time interval and frequency or subcarrier) resource, or one or two the combination in running time-frequency resource and code source, the space resources, the frequency resource of OFDM refers to the subcarrier set in the ofdm system.
In step 101, the radio-resource-configuration attribute is the radio-resource-configuration mode among the RB, comprising: mode one, and all RB configurations of ofdm system are identical; Mode two, the RB configuration of ofdm system is different.
Correspondingly, in step 101, determine that the processing of side-play amount set is specially: the mode of the radio-resource-configuration in RB is mode a period of time, and the part or all of side-play amount among selection 0～A-1 is as the element in the side-play amount set, wherein, A is the sub-carrier number among the RB; When the mode of the radio-resource-configuration among the RB was mode two, the part or all of side-play amount among selection 0～B-1 was as the element in the side-play amount set, and wherein, B is the total number of sub-carriers in the ofdm system.
In step 102, cycle or aperiodic, ground selected the processing of a side-play amount to be specially from the side-play amount set: transmit leg voluntarily or according to recipient's feedback information period or aperiodic ground from the side-play amount set, select a side-play amount.The method that side-play amount is selected can according to different principles (as, Block Error Rate minimum, throughput maximum etc.) determine that the present invention is unqualified to this.
Wherein, above-mentioned transmit leg selects the processing of a side-play amount to be specially according to recipient's feedback information: the recipient adds up under the part or all of side-play amount, the channel quality test value of RB; Recipient's calculating section or all under the side-play amount is based on the quality index of a channel information of the channel quality test value of RB; Receive direction transmit leg feedback fraction or whole offset information; Transmit leg is selected a side-play amount (specifically describing below with reference to example 1) according to predetermined side-play amount selection principle.
Above-mentioned transmit leg selects the processing of a side-play amount to be specially voluntarily: the data that transmit leg is added up under the current side-play amount send quality; Transmit leg is adjusted side-play amount according to the variation that data send quality; Transmit leg is attempted adjusting side-play amount, and sends data on the RB of adjusted side-play amount correspondence, attempts adjusting up to side-play amount and finishes; After attempting adjusting end, transmit leg selects to send a side-play amount (specifically describing below with reference to example 2) the best in quality from attempt the result.
In step 102, the processing that changes the radio-resource-configuration among the part or all of RB is specially: transmit leg according to the predetermined migration mapping mode, changes the subcarrier composition that comprises among the part or all of RB according to the side-play amount of selecting.
As mentioned above, the RB of ofdm system can be divided into two classes, and a class is called dynamic RB, and dynamically the subcarrier composition that comprises among the RB is variable, another kind ofly is called static RB, and the subcarrier composition that comprises among the static RB is immutable.RB in the ofdm system can only have static RB, also dynamic RB can only be arranged, and can also static RB also be arranged existing dynamic RB.In addition, the ofdm system subcarrier is by the ascending numbering of frequency, claim this to be numbered the physics numbering, subcarrier number among the RB is the subcarrier logical number, for centralized RB, side-play amount is that 0 o'clock logical number is identical with the physics numbering, for distributed RB, side-play amount is 0 o'clock, and there are the mapping relations of determining in logical number and physics numbering.
Based on this, above-mentioned predetermined migration mapping mode is: under specific side-play amount, and the logical number of continuous sub-carriers (logical number of the subcarrier that RB is interior is continuous) and the physically mapping relations of the physics numbering (the physics numbering is corresponding with the actual frequency of subcarrier) of discrete subcarrier in logic.
Wherein, need the numbering of pre-defined RB and the logical number of corresponding subcarrier.A kind of mode of definition is to number the logical number of the subcarrier among the big RB always greater than the logical number of the little RB subcarrier of numbering, and for example: RB0 comprises LSC0～11, and VRB1 comprises LSC12～23 ....In addition, when having static RB, the logical number of the subcarrier among the static RB is identical under different side-play amounts with the mapping relations of physics numbering.
In step 103, the processing of dispatching data to be transmitted according to the RB after changing is specially: transmit leg is dispatched the data for the treatment of to one or more recipients' transmission according to scheduling strategy on the RB after the change.
Thus, can the present invention is based on the flow process of the wireless resource block offset selection method embodiment of feedback, as shown in Figure 2, comprise the steps:
Step 201 is determined the side-play amount set according to the radio-resource-configuration attribute among the RB;
Step 202, the recipient obtains in the side-play amount set under all or part of side-play amount quality index of a channel information based on the channel quality test value of RB, and according to quality index of a channel information to transmit leg feedback fraction or whole offset information;
Step 203, transmit leg are selected to cycle or aperiodic a side-play amount according to the part or all of offset information of recipient's feedback;
Step 204, transmit leg changes radio-resource-configuration among the part or all of RB according to selected side-play amount, and under new RB configuration, sends data to the recipient.
Below will further describe the present invention and how change radio-resource-configuration in the wireless resource block according to the offset information of recipient's feedback by example.
Example 1: transmit leg is selected a side-play amount according to recipient's feedback information, and wherein, transmit leg is BS, and the recipient is UE.
As shown in Figure 3, the present invention includes following processing under this example:
Step 301 is determined the side-play amount set according to the radio-resource-configuration attribute in the wireless resource block.
Suppose that ofdm system carrying data frequency resource bandwidth is 9MHz, subcarrier spacing is 15KHz, is 600 except the useful sub-carrier number of direct current (being the 0Hz subcarrier) then, setting from-4.5MHz is to 4.5MHz, subcarrier number is SC0～SC599,50 Resource Block (RB0～RB49), each RB comprises 12 subcarriers, and the side-play amount set is for { 0,1,2,3,4,5,6,7,8,9,10,11}, RB are the centralised allocation pattern, and promptly the subcarrier among each RB is continuous, as corresponding and 0 side-play amount, RB0 comprises subcarrier SC0, SC1 ..., SC11, RB1 comprises SC12, SC13 ..., SC23, and the like, the subcarrier number difference that different RB comprises.RB can also be the distributed allocation pattern, promptly, set up the numbering of continuous sub-carriers in logic (as the LSC0～LSC599) and the mapping relations of discrete subcarrier number physically, for example with the m+12 * n logical sub carrier wave and the m * 50+n physical sub-carrier correspondence, m=0～11 wherein, n=0～49.Under the distributed allocation pattern, corresponding to 0 side-play amount, RB0 comprises subcarrier LSC0, LSC1 ..., LSC11, RB1 comprise LSC12, LSC13 ..., LSC23, and the like.Ofdm system modulation coding mode (MCS) is divided into 6 kinds, is respectively that 1# is (QPSK, a 1/3Turbo sign indicating number), 2# is (QPSK, the 1/2Turbo sign indicating number), 3# is (16QAM, a 1/3Turbo sign indicating number), 4# is (16QAM, the 1/2Turbo sign indicating number), 5# is (64QAM, a 1/3Turbo sign indicating number), 6# is (64QAM, a 1/2Turbo sign indicating number).
Step 305 according to side-play amount selection principle, is determined side-play amount.BS receives the offset information set of Y UE feedback, and wherein Y is smaller or equal to X, according to side-play amount selection principle (as, make to Y UE and send data, the throughput maximum also can be the summation maximum to Y subchannel capacities of Y UE transmission in other example), determine side-play amount.
Step 307 on the RB of UE according to the side-play amount correspondence of resource assignment information after refreshing, receives and issues the data of oneself.(step 302-step 307 is given X recipient simultaneously for transmit leg and is sent the flow process of data)
Example 2: transmit leg is selected a side-play amount voluntarily, and wherein, transmit leg is BS, and the recipient is UE.
As shown in Figure 4, the present invention includes following processing under this example:
Step 401 is determined the side-play amount set according to the radio-resource-configuration attribute in the wireless resource block.
Suppose that ofdm system carrying data frequency resource bandwidth is 9MHz, subcarrier spacing is 15KHz, is 600 except the useful sub-carrier number of direct current (being the 0Hz subcarrier) then, setting from-4.5MHz is to 4.5MHz, subcarrier number is SC0～SC599,50 Resource Block (RB0～RB49), each RB comprises 12 subcarriers, and the side-play amount set is for { 0,1,2,3,4,5,6,7,8,9,10,11}, RB are the centralised allocation pattern, and promptly the subcarrier among each RB is continuous, as corresponding and 0 side-play amount, RB0 comprises subcarrier SC0, SC1 ..., SC11, RB1 comprises SC12, SC13 ..., SC23, and the like, the subcarrier number difference that different RB comprises.RB can also be the distributed allocation pattern, promptly, set up the numbering of continuous sub-carriers in logic (as the LSC0～LSC599) and the mapping relations of discrete subcarrier number physically, for example with the m+12 * n logical sub carrier wave and the m * 50+n physical sub-carrier correspondence, m=0～11 wherein, n=0～49.Under the distributed allocation pattern, corresponding to 0 side-play amount, RB0 comprises subcarrier LSC0, LSC1 ..., LSC11, RB1 comprise LSC12, LSC13 ..., LSC23, and the like.The ofdm system modulation coding mode is divided into 6 kinds, is respectively that 1# is (QPSK, a 1/3Turbo sign indicating number), and 2# is (QPSK, a 1/2Turbo sign indicating number), 3# is (16QAM, a 1/3Turbo sign indicating number), and 4# is (16QAM, a 1/2Turbo sign indicating number), 5# is (64QAM, a 1/3Turbo sign indicating number), and 6# is (64QAM, a 1/2Turbo sign indicating number).
Step 406 finishes if attempt adjusting, and then carry out step 407, does not finish then carry out step 405 if attempt adjusting.
Step 407 is selected to send side-play amount the best in quality from attempt the result, as new side-play amount, and sends data on the pairing RB of the side-play amount after refreshing, and returns step 403.
Like this, by means of the present invention, can be by changing the sub-carrier configuration among the RB, make in the ofdm system bandwidth and to optimize for one or more recipients on the channel capacity statistical significance based on the subchannel of RB bandwidth, and then improved the throughput of transmitting.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of wireless resource block offset selection method based on feedback is applied to ofdm system, it is characterized in that, comprising:
(1) determine side-play amount set after, the recipient obtains in the described side-play amount set under all or part of side-play amount quality index of a channel information based on the channel quality test value of described wireless resource block;
(2) described recipient according to described quality index of a channel information to transmit leg feedback fraction or whole offset information;
(3) described transmit leg is selected a side-play amount according to described part or all of offset information.
2, the method for claim 1 is characterized in that, described wireless resource block comprises: running time-frequency resource, one or whole combinations in running time-frequency resource and code source or the space resources.
3, the method for claim 1 is characterized in that, determines the side-play amount set described in the step (1), comprises according to the radio-resource-configuration attribute in the described wireless resource block and determining.
4, method as claimed in claim 3 is characterized in that, described radio-resource-configuration attribute is the radio-resource-configuration mode in the described wireless resource block, comprising:
Mode one, the described wireless resource block configuration of all of ofdm system is identical;
Mode two, the described wireless resource block configuration of ofdm system is different.
5, method as claimed in claim 4 is characterized in that, according to the radio-resource-configuration attribute in the described wireless resource block, determines that described side-play amount set comprises:
Radio-resource-configuration mode in the described wireless resource block be described mode for the moment, select part or all of side-play amount among 0～A-1 as the element in the described side-play amount set, wherein, A is the sub-carrier number in the described wireless resource block; And
When the radio-resource-configuration mode in the described wireless resource block is described mode two, select part or all of side-play amount among 0～B-1 as the element in the described side-play amount set, wherein, B is the total number of sub-carriers in the ofdm system.
6, the method for claim 1 is characterized in that, described step (2) comprising:
(21) described recipient adds up in the set of described side-play amount partly or entirely under the side-play amount, the channel quality test value of described wireless resource block;
(22) described recipient calculates under the described part or all of side-play amount, based on the described quality index of a channel information of the channel quality test value of described wireless resource block.
7, method as claimed in claim 6, it is characterized in that, quality index of a channel information described in the step (22) comprises quantized value or statistical value to described channel quality test value, and the positional information of the described wireless resource block corresponding with described quantized value or statistical value.
8, the method for claim 1 is characterized in that, recipient described in the step (2) preferably partly or with whole side-play amounts feeds back to described transmit leg according to the side-play amount selection strategy.
9, the method for claim 1 is characterized in that, offset information described in the step (2) be following any:
Side-play amount;
Side-play amount and corresponding quality index of a channel information;
Side-play amount set and corresponding quality index of a channel ensemble of communication;
Side-play amount and corresponding channel quality test value;
Side-play amount set and corresponding channel quality test value set.
10, the method for claim 1 is characterized in that, transmit leg described in the step (3) is selected a described side-play amount according to predetermined side-play amount selection principle.
11, the method for claim 1 is characterized in that, transmit leg cycle or aperiodic described in the step (3), described side-play amount was selected on ground.
12, the method for claim 1 is characterized in that, described method further comprises:
(4) described transmit leg changes radio-resource-configuration in the part or all of described wireless resource block according to selected described side-play amount.
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Effective date of registration: 20151230 Address after: 441000, No. six, international innovation industrial base, 49 Deng Cheng Avenue, hi tech Zone, Xiangfan, Hubei, Xiangyang Patentee after: ZTE NEW ENERGY AUTOMOBILE CO., LTD. Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corporation |