CN101184317B - Wireless resource allocation method and device of OFDMA system - Google Patents
Wireless resource allocation method and device of OFDMA system Download PDFInfo
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Abstract
The invention discloses a wireless resource distribution method and a device for orthogonal frequency division multiple access system, comprising following steps: collecting all the user information in current frame and information on the service quality requirements of the users accessed to the system using an information collector; according to the collecting information, calculating the resource that is pre-distributed to the user in an information dispatch model under the condition of meeting the service quality of each user, so that the information can be used as the resource pre-distributive information of the user; a resource allocation module can calculate the resource pre-distributive information and select the user meeting the integrated performance requirement of the system, and implement resource allocation according to the resource pre-distributive information of the user; in accordance with the result of resource allocation, all the user information in the system in current frame can be updated. The invention has the advantages of ensuring continuous resources acquisition of each frame for each user, facilitating the guarantee of the quality requirement of the business flow of the user, optimizing the system performance, enabling the fairness among the users; furthermore, and facilitating the reduction of the complexity of system design and optimization of the distribution efficiency.
Description
Technical field
The present invention relates to wireless communication field, especially relate to a kind of wireless resource allocation methods of orthogonal frequency division multiple access system.
Background technology
OFDM (Orthogonal Frequency Division Multiplex, be called for short OFDM) be a kind of multi-carrier communication technology, it by serial to parallel conversion, is assigned to data flow at a high speed in several relatively low mutually orthogonal subcarriers of transmission rate and transmits.Ofdm system can effectively be eliminated intersymbol interference (Inter Symbol Interference is called for short ISI) and the inter-carrier interference (Inter Channel Interference is called for short ICI) that the multidiameter delay expansion is produced, and effectively utilizes frequency resource.OFDM (Orthogonal Frequency Division Multiple Access, be called for short OFDMA) be a kind of access technology that is based upon on the orthogonal frequency-division multiplex base plinth, it realizes that by distribute independent sub-carriers and time slot method for the user multiple access inserts, wherein a plurality of subcarriers are formed a subchannel, data can be transmitted to the user according to quality of services for users (Quality of Service is called for short QoS) the one or more subchannels of demand assignment in system.Because its superior performance, OFDMA becomes current high-speed data access system (as IEEE 802.16a/d/e wireless broadband access system) modulation technique scheme.
The resource allocation of OFDMA system is a challenge that relates to subcarrier allocation, power division and Adaptive Modulation.According to present existing research, mainly adopt the method for step-by-step optimization to realize the OFDMA system resource allocation: allocation of subcarriers at first, determine power, modulation system and the bit loading number of each subcarrier then.Can adopt the stator allocation of carriers to reduce complexity, but when the subcarrier transmitting data of user, can cause power system capacity decline in bad channel quality.Another kind method is an allocation of subcarriers adaptively, and this method can improve throughput of system.About the research of subcarrier allocation algorithm, mainly be the QoS that will guarantee fairness and each user between the user, and utilize subscriber channel difference obtain big as far as possible overall system throughput or run out may be little power.Current subcarrier allocation research mainly concentrates on (for example giving the best user of channel status with resource allocation constantly at each) on a certain distributing slot resources, does not consider the relation of allocation of carriers between each time slot.
Summary of the invention
The purpose of this invention is to provide a kind of distribution method and device of realizing wireless resource of OFDMA system, can satisfy the QoS of customer requirement, can improve the performance of entire system again.
Technical solution of the present invention is: a kind of wireless resource of OFDMA system distribution method, and it may further comprise the steps:
Whole user profile and each quality of services for users of connecting system require information when a, collection present frame;
B, according to the information of gathering, calculate when satisfying each quality of services for users and require, can be pre-assigned to this user's resource, as this user's pre-allocation of resources information;
C, add up each user's resource allocation information, choose and to satisfy some users that the entire system performance requires, carry out resource allocation according to this user's pre-allocation of resources information;
D, according to resource allocation result, whole user profile in the system when upgrading present frame;
E, repeating step a, b, c, d are distributed fully until the present frame resource.
By the collection of user profile and different quality of service requirements, calculate respectively earlier, obtain the pre-allocation of resources information that can distribute separately, require to select suitable user to carry out resource allocation according to the entire system performance again.Adopt this mode, can under the prerequisite of optimization that guarantees systematic function and the fairness between the user, fully satisfy the quality of service requirement of each user traffic flow; Use Calculation Method respectively, help reducing the complexity of system design.
As a kind of prioritization scheme, before step a, carry out following steps earlier: the OFDM wireless resource block is divided according to frequency domain and time-domain simultaneously, frequency domain is made of N frequency band subchannel, each frequency band is made of one group of subcarrier, time-domain was made of M time period, and each time period is made of several OFDM symbols; Frequency-time block that the transmission elementary cell was made up of a frequency band and time period, total N * M continuous frequency-time block can be assigned with in each OFDM frame.By the OFDM wireless resource block is divided according to frequency domain and time-domain, can make full use of the orthogonal property of subcarrier, distribute resource requirement according to different user neatly in the actual transmissions situation of each subcarrier, can preallocated frequency-time block by calculating each user respectively, guarantee user's mass parameter requirement separately fully.
As a kind of optimal way, among the step b, gather the data capacity information of each user in optional frequency-time block, specify the initial frequency-time block of this user in present frame, as this user's initial resource allocation information; Calculating is when satisfying this QoS of customer requirement, but the preassignment frequency-time block that in present frame, spreads continuously along time shaft and/or frequency axis, as the current resource allocation information of this user.Adopt this method of salary distribution, can guarantee that the resource that each user is assigned with is continuous, make system, realize making full use of the OFDM Resource Block with simpler mode management resource and user's mapping relations; Make the user can once receive whole resources of gained simultaneously, reduce received power, satisfy the requirement of the minimum assurance speed of user.
Among the step b, gather the different service quality of each user when present frame and require information, calculate respectively when satisfying the variant quality of service requirement of this user at the same time, but from this user's initial frequency-time block along time shaft and/or preassignment frequency-time block of spreading continuously of frequency axis, as the current resource allocation information of this user.Can fully take into account user's different business stream type, satisfy the demand of the different practical applications of user.
Among the step b, gather the different service quality of each user when present frame and require information, the priority of definition different brackets, but according to preassignment frequency-time block that priority orders is calculated from this user's initial frequency-time block along time shaft successively and/or frequency axis spreads continuously, as the current resource allocation information of this user.The definition different priorities, the timing of convenient branch is selected, and helps improving usage factor of system resource.
Among the step c, add up each user's resource allocation information, choose one of them and can satisfy the user that the entire system performance requires, carry out resource allocation according to this user's resource allocation information.According to the method, divide timing, this customer requirements is met, increase efficiency of resource distribution at first resource.
A kind of wireless resource of OFDMA system distributor of the present invention, it comprises with lower module: acquisition module, whole user profile of connecting system and each quality of services for users require information, and output relevant information when being used to gather present frame; The schedule information module is used to receive each user profile and quality of service requirement information, calculates respectively when satisfying each quality of services for users requirement, can distribute to this user's pre-allocation of resources information respectively, and will export each user's pre-allocation of resources information; Resource distribution module is used to receive each user's pre-allocation of resources information, chooses the pre-allocation of resources information that can satisfy some users that the entire system performance requires and carries out resource allocation, distributes the back to upgrade each user profile.
As a kind of improvement, described schedule information module comprises two schedule information submodules at least, be respectively applied for and receive the dissimilar quality of service requirement information of each user, and calculate the pre-allocation of resources information that to distribute to this user under the type quality of service requirement satisfying respectively.Distinguish different schedule information submodules and come computing respectively not stop the quality of service requirement of type, help improving the arithmetic speed of device integral body.
The mode of optimizing is: require to be provided with priority according to each quality of services for users between each described schedule information submodule.Distinguish priority, user resources preassignment information is provided respectively, help alleviating the power consumption of resource distribution module, improve the efficient of system bandwidth.
The invention has the beneficial effects as follows: in the allocation of radio resources of orthogonal frequency division multiple access system, can guarantee that the resource that each user obtains at every frame is continuous, help guaranteeing the quality requirement of user traffic flow, simultaneously can the optimization system performance, realize the fairness between each user, help to reduce system design complexity and optimized distribution efficient.
Description of drawings
Accompanying drawing 1 is the structural representation of the embodiment of the invention 1;
Accompanying drawing 2 is the resource allocation methods flow chart of the embodiment of the invention 1;
Accompanying drawing 3 is the structural representation of the embodiment of the invention 2;
Accompanying drawing 5 is a resource allocation schematic diagram in the embodiment of the invention 2;
Accompanying drawing 6 is the resource allocation methods flow chart of the embodiment of the invention 2;
Accompanying drawing 7 is the embodiment of the invention 3 structural representations;
Accompanying drawing 8 is the resource allocation methods flow chart of the embodiment of the invention 3;
Accompanying drawing 9 is the structural representation of the embodiment of the invention 4;
Accompanying drawing 10 is the resource allocation methods flow chart of the embodiment of the invention 4.
Embodiment
Embodiment 1:
Consult Fig. 1, a kind of wireless resource of OFDMA system distributor, it comprises with lower module: acquisition module 1, whole user profile of connecting system and each quality of services for users require information, and output relevant information when being used to gather present frame;
Schedule information module 2, be used to receive each user profile and quality of service requirement information, calculate respectively when satisfying each quality of services for users requirement, can distribute to this user's pre-allocation of resources information respectively, and will export each user's pre-allocation of resources relevant information;
Resource distribution module 3 is used to receive each user's pre-allocation of resources information, chooses the pre-allocation of resources information that can satisfy some users that the entire system performance requires and carries out resource allocation, distributes the back to upgrade each user profile.
Consult Fig. 2, a kind of wireless resource of OFDMA system distribution method, it may further comprise the steps:
Whole user profile and each quality of services for users of connecting system require information when A1, collection present frame, comprise each user profile of present frame (as channel condition information, modulation coding mode etc.) and each quality of services for users requirement, quality of service requirement is presented as the qos parameter set of Business Stream, comprises maximum continue speed (Maximum Sustained Rate), minimum assurance speed (Minimum Rate Request), maximum delay (Maximum Latency), maximum delay shake (Maximum Delay Jitter) etc.;
A2, according to the user profile that receives, calculate when satisfying each quality of services for users and require, can be pre-assigned to frequency-time block of this user, as this user's pre-allocation of resources information;
A3, the pre-allocation of resources information of adding up each user are chosen and can be satisfied the user that the entire system performance requires, and carry out resource allocation according to this user's pre-allocation of resources information;
A4, according to resource allocation result, whole user profile in the system when upgrading present frame;
A5, judge that whether resource distribute fully, if then finish; If do not distribute fully, return steps A 1.
Embodiment 2:
Consult Fig. 3, a kind of wireless resource of OFDMA system distributor, it comprises with lower module: acquisition module 1, whole user profile of connecting system and each quality of services for users require information, and output when being used to gather present frame;
Schedule information module 2 is used to receive each user profile and quality of service requirement information, calculates respectively when satisfying each quality of services for users requirement, can distribute to each user's pre-allocation of resources information respectively, and will export each user's pre-allocation of resources information;
Resource distribution module 3 is used to receive each user's pre-allocation of resources information, chooses some pre-allocation of resources information that satisfy the user that the entire system performance requires, and carries out resource allocation, distributes the back to upgrade each user profile.
Consult Fig. 4 and Fig. 5, the subcarrier of OFDMA has orthogonal property, can realize that user's multiple access inserts, utilize this characteristic, OFDMA wireless resource block (OFDMA frame) is divided frequency domain and time-domain, and frequency domain is made of N frequency band (subchannel), and each frequency band is made of one group of subcarrier, time-domain was made of M the time period (time slot), and each time period is made of several OFDMA symbols.Frequency-time block (Frequency-TimeBlock that basic transmission elementary cell was made up of a frequency band and time period, be called for short FTB), total N * M transmits elementary cell (FTB) and can be assigned with in an OFDMA frame, the user can according to dynamic demand in some time period at some subcarrier transmitting data.When calculating user's pre-allocation of resources information, determine initial FTB as starting point according to time shaft or resource axle, spread to adjacent unallocated frequency-time block (FTB), distribute continuous unallocated frequency-time block (FTB) to give this user, till the all-mass that the distribution of Resource Block can be satisfied the user requires.
Consult Fig. 6, a kind of wireless resource of OFDMA system distribution method, it may further comprise the steps:
B1, the OFDM wireless resource block is divided according to frequency domain and time-domain simultaneously, frequency domain is made of N frequency band subchannel, each frequency band is made of one group of subcarrier, and time-domain was made of M time period, and each time period is made of several OFDM symbols; Frequency-time block FTB that the transmission elementary cell was made up of a frequency band and time period, total N * M continuous frequency-time block FTB can be assigned with in each OFDM frame;
Whole user profile and each quality of services for users of connecting system require information when B2, collection present frame, comprise each user profile of present frame (as channel condition information, modulation coding mode etc.) and each quality of services for users requirement, quality of service requirement is presented as the qos parameter set of Business Stream, comprises maximum continue speed (Maximum Sustained Rate), minimum assurance speed (Minimum Rate Request), maximum delay (Maximum Latency), maximum delay shake (Maximum Delay Jitter) etc.;
B3, search for each user's initial FTB;
The user profile that B4, basis receive is calculated when satisfying each quality of services for users requirement, can be pre-assigned to frequency-time block FTB of this user, as this user's pre-allocation of resources information;
B5, the pre-allocation of resources information of adding up each user are chosen and can be satisfied the user that the entire system performance requires, and carry out resource allocation according to this user's pre-allocation of resources information;
B6, according to resource allocation result, whole user profile in the system when upgrading present frame;
B7, judge that whether resource distribute fully, if then finish; If do not distribute fully, return step B2.
Among the step B1 resource division is become distributable frequency-time block FTB, be convenient to subsequent allocations; Determine initial FTB, can guarantee that the resource that user's actual allocated arrives is continuous, and can fully satisfy user's bandwidth demand.In step B4, considered active user's information (as the qos parameter set of Business Stream), and do not consider other qos parameters of user traffic flow such as maximum delay and delay variation, do not consider the fairness information (consequently pre-allocation of resources information) between the user yet, be used to tell system if satisfy the condition that current each quality of services for users requires, need distribute how many resources and how to distribute for this user.Among the step B5 from the angle of system, with the pre-allocation of resources information that provides as foundation, divide timing need consider the relation (as fairness between the user) between the user and the performance parameter (as throughput of system, power consumption etc.) of whole system, determine which user to need this Resources allocation, determine whether this frame Resources allocation finishes update user information etc.Consider from fairness between the access user, except this frame distributes the fairness (short-term fairness) that realizes each user, also to consider the long-term justice between the user, with the situation of avoiding the certain user to occur can not get for a long time serving, to realize the high-throughput and the low-power consumption of system.
Owing to will realize the high-throughput of entire system, will consider the utilance of user to system bandwidth to the selection of all resource allocation informations.Choose the resource allocation object of the user of resource allocation information and resource area ratio maximum as this sub-distribution, the resource of distribution is exactly the OFDMA frame space of resource allocation information representative.
Embodiment 3:
In the practical application, each user comprises some Business Streams that show by a series of qos parameters, for example a user generally includes real time business stream and non-real-time service stream, non-real-time service stream may include the business of minimum-rate requirement and (the Best Effort that does one's best again, abbreviation BE) business, so when each user resources preassignment information of calculating, should consider that the different business stream type is to realize the needs of different practical applications.
Consult Fig. 7, a kind of wireless resource of OFDMA system distributor, difference among it and the embodiment 1 is to comprise in the described schedule information module 2 at least two schedule information submodule A and B, be respectively applied for the dissimilar quality of service requirement information of each user that receives, and calculate respectively and satisfying under the type quality of service requirement, can distribute to this user's pre-allocation of resources information; Wherein, schedule information submodule A21 is used to handle considering real time business stream and having under the non-real-time service stream requirement of minimum speed limit requirement, can distribute to each user's pre-allocation of resources information; Schedule information submodule A22 is used to handle under the requirement of considering the BE Business Stream, can distribute to each user's pre-allocation of resources information.
Consult Fig. 8, a kind of wireless resource of OFDMA system distribution method, it may further comprise the steps:
Whole user profile and each quality of services for users of connecting system require information when C1, collection present frame, comprise each user profile of present frame (as channel condition information, modulation coding mode etc.) and each quality of services for users requirement, quality of service requirement is presented as the qos parameter set of Business Stream, comprises maximum continue speed (Maximum Sustained Rate), minimum assurance speed (Minimum Rate Request), maximum delay (Maximum Latency), maximum delay shake (Maximum Delay Jitter) etc.;
C2, calculating can be distributed to each user's pre-allocation of resources information considering real time business stream and having under the non-real-time service stream requirement of minimum speed limit requirement;
C3, calculating can be distributed to each user's pre-allocation of resources information under the requirement of considering the BE Business Stream;
C4, the pre-allocation of resources information of adding up each user are chosen and can be satisfied the user that the entire system performance requires, and carry out resource allocation according to this user's pre-allocation of resources information respectively;
C5, according to resource allocation result, whole user profile in the system when upgrading present frame;
C6, judge that whether resource distribute fully, if finish; If do not distribute fully, return step C1.
In the present embodiment, system should at first realize satisfying the non-real-time data demand of each user's real time data and minimum speed limit requirement, the process of the calculating process of schedule information submodule 21 and embodiment 2 is similar at this moment, when in the OFDMA frame remaining space being arranged, traffic control information submodule 22 is realized the distribution of BE data.
Embodiment 4:
Consult Fig. 9, a kind of wireless resource of OFDMA system distributor, difference among it and the embodiment 1 is to comprise in the described schedule information module 2 N schedule information submodule, be respectively applied for and receive the dissimilar quality of service requirement information of each user, and calculate the pre-allocation of resources information that to distribute to this user under the type quality of service requirement satisfying respectively; Described schedule information submodule 21,22 ... require to be provided with priority according to each quality of services for users between the 2N.The convenient selection that divides timing helps improving usage factor of system resource.
Consult Figure 10, a kind of wireless resource of OFDMA system distribution method, it may further comprise the steps:
Whole user profile and each quality of services for users of connecting system require information when D1, collection present frame, comprise each user profile of present frame (as channel condition information, modulation coding mode etc.) and each quality of services for users requirement, quality of service requirement is presented as the qos parameter set of Business Stream, comprises maximum continue speed (Maximum Sustained Rate), minimum assurance speed (Minimum Rate Request), maximum delay (Maximum Latency), maximum delay shake (Maximum Delay Jitter) etc.;
D2, calculating are considering can to distribute to each user's pre-allocation of resources information under the non-real-time service stream requirement that real time business stream and minimum speed limit require;
D3, calculating can be distributed to each user's pre-allocation of resources information under the requirement of considering the BE Business Stream;
D4, judge that whether formerly Business Stream requires priority, in this way, enter the D5 step, if not, the D6 step entered;
D5, the pre-allocation of resources information of adding up each user are chosen and can be satisfied the user that the entire system performance requires, and carry out resource allocation according to this user's pre-allocation of resources information respectively;
D6, according to resource allocation result, whole user profile in the system when upgrading present frame;
D7, judge that whether resource distribute fully, if finish; If do not distribute fully, return step D1.
In the present embodiment, system should at first realize satisfying the higher user quality demand of priority, non-real-time data demand as real-time data and minimum speed limit requirement, the process of the calculating process of schedule information submodule 21 and embodiment 2 is similar at this moment, when in the OFDMA frame remaining space being arranged, schedule information submodule 22 can move, and realizes the distribution of BE data.
In the present embodiment, gather the different service quality of each user when present frame and require information, the priority of definition different stage, but calculate preassignment frequency-time block of this user successively according to priority orders, as this user resources preassignment information.By to different Business Stream definition priority, the Business Stream of equal priority is placed on in calculation process, so the priority number is consistent with system calculation process number of times.System is when handling the traffic data of different priorities, at first handle the high-priority service flow data, handle lower-priority data again, for example in the execution mode 3 real time business flow data and non-real-time service flow data that the minimum speed limit requirement is arranged as same priority (height) data, the BE traffic data is handled as lower-priority data.
Above-listed detailed description is at the specifying of possible embodiments of the present invention, and this embodiment is not in order to limiting claim of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the claim of this case.
Claims (7)
1. wireless resource of OFDMA system distribution method, it is characterized in that: it may further comprise the steps:
A, acquisition step: whole user profile of connecting system and each quality of services for users require information when gathering present frame;
B, preassignment step: gather each user at the wireless resource block of dividing according to frequency domain and time-domain, it is the data capacity in frequency-time block, specify the initial frequency-time block of this user in present frame, initial resource allocation information as this user, calculating is when satisfying this QoS of customer requirement, but the preassignment frequency-time block that spreads continuously along time shaft and/or frequency axis in present frame is as the current pre-allocation of resources information of this user;
C, allocation step: add up each user's pre-resource allocation information, choose one of them and can satisfy the user that the entire system performance requires, carry out resource allocation according to this user's pre-allocation of resources information;
D, step of updating: according to resource allocation result, whole user profile of present frame in the update system;
E, repeating step a, b, c, d are distributed fully until the present frame resource.
2. a kind of wireless resource of OFDMA system distribution method according to claim 1, it is characterized in that: before execution in step a, carry out partiting step, promptly the wireless resource block of current each OFDM frame is divided according to frequency domain and time-domain simultaneously, frequency domain is made of N frequency band subchannel, each frequency band is made of one group of subcarrier, time-domain was made of M time period, and each time period is made of several OFDM symbols; Frequency-time block that the transmission elementary cell was made up of a frequency band and time period, always total N * M continuous frequency-time block can be assigned with.
3. a kind of wireless resource of OFDMA system distribution method according to claim 2, it is characterized in that: among the step b, gather the different service quality of each user when present frame and require information, calculate respectively when satisfying the variant quality of service requirement of this user at the same time, but from this user's initial frequency-time block along time shaft and/or preassignment frequency-time block of spreading continuously of frequency axis, as the current pre-allocation of resources information of this user.
4. a kind of wireless resource of OFDMA system distribution method according to claim 3, it is characterized in that: among the step b, gather the different service quality of each user when present frame and require information, the priority of definition different brackets, but according to preassignment frequency-time block that priority orders is calculated from this user's initial frequency-time block along time shaft successively and/or frequency axis spreads continuously, as the current pre-allocation of resources information of this user.
5. wireless resource of OFDMA system distributor, it is characterized in that: it comprises with lower module:
Acquisition module, whole user profile of connecting system and each quality of services for users require information, and output relevant information when being used to gather present frame;
The schedule information module, be used to receive each user at the wireless resource block of dividing according to frequency domain and time-domain, it is the data capacity in frequency-time block, and specify the initial frequency-time block of this user in present frame, initial resource allocation information as this user, calculating is when satisfying this QoS of customer requirement, but the preassignment frequency-time block that in present frame, spreads continuously along time shaft and/or frequency axis, can distribute to the current pre-allocation of resources information of this user respectively, and export each user's pre-allocation of resources information;
Resource distribution module is used to receive each user's pre-allocation of resources information, chooses the pre-allocation of resources information that can satisfy the user that the entire system performance requires and carries out resource allocation, distributes the back to upgrade each user profile.
6. a kind of wireless resource of OFDMA system distributor according to claim 5, it is characterized in that: described schedule information module comprises two schedule information submodules at least, be respectively applied for and receive the dissimilar quality of service requirement information of each user, and calculate the pre-allocation of resources information that under the condition that satisfies the type quality of service requirement, can distribute to this user respectively.
7. a kind of wireless resource of OFDMA system distributor according to claim 6 is characterized in that: require to be provided with priority according to each quality of services for users between each described schedule information submodule.
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| CN1909537A (en) * | 2005-08-02 | 2007-02-07 | 松下电器产业株式会社 | Method for increasing capacity of multiple districts crossing frequency division multiple address-time division multiple address system |
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| CN1909537A (en) * | 2005-08-02 | 2007-02-07 | 松下电器产业株式会社 | Method for increasing capacity of multiple districts crossing frequency division multiple address-time division multiple address system |
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