CN101094215A - Self-adaptive method for allotting sub carriers in orthogonal frequency division multiplexing multiple access system - Google Patents

Self-adaptive method for allotting sub carriers in orthogonal frequency division multiplexing multiple access system Download PDF

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Publication number
CN101094215A
CN101094215A CNA2006100869830A CN200610086983A CN101094215A CN 101094215 A CN101094215 A CN 101094215A CN A2006100869830 A CNA2006100869830 A CN A2006100869830A CN 200610086983 A CN200610086983 A CN 200610086983A CN 101094215 A CN101094215 A CN 101094215A
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user
subcarrier
mentioned
base station
carrier wave
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CN101094215B (en
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蒋小奎
王强
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2006/003739 priority patent/WO2008000117A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling

Abstract

The method comprises: the user needing to access the system reports his service demand and average channel condition to the base station; the base station determines the minimum subcarrier amounts- NminK capable of being allocated to the users, and informs the NminK and the information about the subcarriers occupied by other users to said user; said user ranks the channel amplitude gains on the subcarrier not occupied from high to low and selects Nmink subcarriers corresponding to said gains; said user sends the information about Nmink subcarriers to the base station.

Description

Self-adaptive method for allotting sub carriers in the orthogonal frequency division multiplexing multiple access connecting system
Technical field
The present invention relates to the mobile radio system technical field, and be particularly related to a kind of the access and realize the method that adaptive subcarrier distributes in (Orthogonal Frequency-Division Multiple Access is hereinafter to be referred as OFDMA) system at orthogonal frequency division multiplexing multiple access.
Background technology
Frequency spectrum resource in the wireless communication system is very limited, and therefore, mobile radio system must reasonably utilize these limited frequency resources.Particularly in future mobile communication system, the user is more and more for the business demand of high speed, high-quality transfer of data, how just to seem more and more important for more users provide high quality services on limited radio frequency resources.In the frequency selective fading environment, OFDM (Orthogonal Frequency-Division Multiplexing is hereinafter to be referred as OFDM) is a kind of solution with future.
OFDM is because have higher spectrum utilization efficiency, frequency selective fading had advantage such as natural immunity, and becomes a key technology of back three generations (Beyond Three Generation is called for short B3G) mobile communication system.Compare with narrow-band communication system, ofdm system has broad frequency resource, and the channel response difference on each subcarrier is very big, therefore, OFDM can be that principle is selected different modulation systems for each subcarrier according to the availability of frequency spectrum and optimum balance, to reach the optimum utilization to resource.Yet, under multi-user environment, at synchronization by a plurality of user's shared channel resources, yet the physical channel that is experienced between each user and the base station is different, that is to say that on each subcarrier, each user's channel response is different, therefore, for the abundant data transfer rate of raising system, be necessary for the channel response of each user on each OFDM subcarrier and carry out subcarrier allocation between the multi-user.The subcarrier allocation algorithm of an excellence must simultaneously have good behaviour on three evaluation indexes: spectrum efficiency or bit number that on average institute can transmit on each subcarrier, to each user's the fairness and the real-time and the complexity of algorithm realization.
In the OFDMA system, the notion of resource can be defined as one group of available subcarrier in the fixed frequency bandwidth.And the distribution of resource is meant in sub-district system mobile cellular system, according to user's channel condition, distributes suitable subcarrier in the most effective spectrum utilization mode for each user, to satisfy the user's communications business demand.
When a mobile subscriber need enter system, he need propose to enter application to the base station, simultaneously to the base station send that its minimum-rate that needs requires, information such as maximum bit error probability and channel condition, the base station receives after these information, through judging, if think that system has enough resources to satisfy this user's requirement, then the base station distributes corresponding resource can for this user, ratifies this mobile subscriber and enters system.After the user obtains resource allocation, will keep a period of time to the taking of these resources, finish up to this user's business.After this user's transmitted in packets finished, he will discharge its resource that takies, thereby logs off.And how long base station this user of failure to disclose before Resources allocation need transmit, even any new channel information or service request have been received in the base station.
In the multi-user ofdma system, the distribution of subcarrier is an important problem.In the OFDMA system, the main subcarrier that relies on is distinguished the user, therefore, at a frame time (certainly also can one be the other times unit, as long as this time quantum is far smaller than the coherence time of channel) in, a CU after certain subcarrier, this subcarrier just can not be reallocated to other users.And, in order to improve system spectral efficiency, wish system under transmission rate and Power Limitation condition, make total transmitting power minimum of system to make the total transmission rate of system be tending towards maximization simultaneously.
In conventional subcarrier allocation algorithm, all be bit error rate (Bit Error Rate number of users, available subcarrier number, user, be called for short BER) require under all known prerequisite, the subcarrier of distributing some for each user makes total transmitting power minimum.Thereby all subcarriers are all distributed to these users, to satisfy these users' minimum requirements.This is a kind of distribution method of static state, and prerequisite is channel condition and the business demand that all number of users, each user are known in the base station.Yet the user applies connecting system is at random, and each user is not that the number of sub carrier wave of use is The more the better, that is to say that the number of sub carrier wave that each user needs has a upper limit and a lower limit.And seldom there is technical literature to consider the problem of the distribution of the subcarrier when new user's request enters system.
In an OFDMA system, the needed number of sub carrier wave of user that each application inserts all has bound, on the one hand in order to satisfy this user's basic service demand, need distribute N at least for this user Min KIndividual subcarrier, promptly N min k = ceil ( R min k / R max ) , R wherein MaxRepresent the peak transfer rate that each subcarrier can allow, its numerical value depends on the coded modulation scheme that system adopts, and ceil (x) expression rounds real number x towards the positive infinity direction.Yet, when transmitting under the minimum speed limit requirement that each subcarrier is all allowing, distribute can at most this user N max k = ceil ( R min K / R min ) Individual subcarrier.Therefore, when a new user applies inserted, system can give this new user's allocation of subcarriers not influencing under the condition of delivery of user traffic in system.
The distribution of traditional subcarrier generally was divided into for two steps to be finished, and the one, earlier determine number of sub carrier wave and power according to new average channel conditions that inserts the user and business demand to this user's distribution by the base station; The 2nd, need to determine the definite subcarrier of distribution further for this user by the base station.In case after above-mentioned two processes are finished, notify the user by control channel by the base station.This method needs the base station that each user's the current channel condition information and the channel condition information of next time quantum are all known about.And in fact, the user applies connecting system is at random, can't predict that user and can initiate this application, also unpredictable these users' channel condition.
Summary of the invention
The present invention develops in order to address the above problem, its objective is the solution that a kind of the problems referred to above are provided, promptly in the time of a user applies connecting system, and only allow a user to insert in each time quantum, system under transmission rate and Power Limitation condition how according to the variation self adaptation allocation of subcarriers of subscriber channel condition, make and total transmitting power minimum of system make the total transmission rate of system be tending towards maximization simultaneously.
In order to address the above problem, the present invention proposes the self-adaptive method for allotting sub carriers in a kind of OFDMA system, the subcarrier of the required distribution of existing subscriber is determined in the system, before the user's who needs connecting system business transmission does not finish, existing subscriber's subcarrier allocation situation does not change, and it comprises the steps:
The first step: need the user of connecting system that service transmission rate demand and the average channel conditions on whole carrier wave are uploaded to the base station;
Second step: the base station decision can be distributed to the above-mentioned minimum number of sub carrier wave N that needs the user of connecting system Min k, to guarantee to satisfy this user's basic service demand;
The 3rd step: the base station should minimum number of sub carrier wave information N Min KAnd do not notified the above-mentioned user who needs connecting system by the subcarrier information of other CUs;
The 4th step: the above-mentioned user who needs connecting system will not arranged according to order from big to small by the gain of the channel magnitude on the subcarrier of other CUs;
The 5th step: the above-mentioned user who needs connecting system once selects N according to order from big to small from above-mentioned amplitude gain in not by the subcarrier of other CUs Min KThe corresponding subcarrier of individual gain;
The 6th step: above-mentionedly need the user of connecting system with this N Min KIndividual definite subcarrier information feeds back to the base station.
Average channel conditions in the above-mentioned first step comprises average channel gain, average channel gain H K = 1 N Σ n = 1 N | h K , n | 2 , Wherein, N represents total number of sub-carriers order available in the system, h K, nRepresent the channel response on each subcarrier, K represents to have had in the said system K-1 user allocation of subcarriers.
Minimum number of sub carrier wave in above-mentioned second step N min K = ceil ( R min K / R max ) , Wherein, R Min KRepresent minimum transmission rate request information, R MaxRepresent the peak transfer rate that each subcarrier can allow, its numerical value depends on the coded modulation scheme that system adopts, and ceil (x) expression rounds real number x towards the positive infinity direction, and K represents to have had in the said system K-1 user allocation of subcarriers.Its basic service demand comprises the service transmission rate demand.
The minimum number of sub carrier wave sum that other all users need is added up in the base station in above-mentioned second step, if the minimum number of sub carrier wave sum that above-mentioned other all users need surpasses available total number of sub-carriers order in the system, then do not need the user of connecting system to distribute any subcarrier to above-mentioned; If the minimum number of sub carrier wave sum that above-mentioned other all users need is not more than total number of sub-carriers order available in the system, the system of then indicating can be the above-mentioned user's allocation of subcarriers that needs connecting system.
Certainly, in the said method implementation procedure, hinted each user knows whom which subcarrier taken by, this point can realize by agreement, just can determine which subcarrier is in " having much to do " state according to information such as SNR in 802.11.
The advantage of method of the present invention is to compare with traditional sub-carrier wave distribution method, the user does not need to upload its channel condition on all subcarriers to the base station on the one hand, and just upload average channel gain, because at the determinant carrier number, mainly be that average channel gain works, rather than the channel response on each subcarrier; Decide by user oneself on the other hand and select which subcarrier for use, avoided a plurality of users to compete the situation of same sub-carrier jointly, taken by whom because which subcarrier each user knows.Therefore, method of the present invention can make total transmitting power minimum of system, makes the total transmission rate of system be tending towards maximization simultaneously
Below in conjunction with accompanying drawing, concrete enforcement of the present invention is described in further detail.For those skilled in the art that, from the detailed description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is a flow chart of realizing a preferred embodiment of subcarrier self-adapting distribution method in the OFDMA system of the present invention.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail below:
Fig. 1 describes the principle that realizes that according to of the present invention adaptive subcarrier distributes in the OFDMA system in detail, and its problem that mainly solves is to distribute suitable subcarrier when inserting for new user applies.Describe the embodiment of this distribution method in detail below in conjunction with Fig. 1.
In order to narrate conveniently, suppose in the OFDMA system, to have K-1 user to be in state of activation, that is to say that the subcarrier of this K-1 the required distribution of user is definite, this K-1 user remembers respectively and does user 1,2 ..., K-1.A new user is arranged now, and note is done user K application and is entered system for the time being.And before the business transmission of this user K did not finish, this K-1 user's subcarrier allocation situation do not change, and this point is satisfiable in the certain hour scope.
At first, user K is according to its channel response h on each subcarrier K, nEstimate the average channel gain H that it is corresponding KThis average channel gain can be write in 2000 according to Hujun Yin and Hui Liu, be disclosed at IEEE Globecom ' 00, San Francisco, USA, the similar approach of describing in the paper in 2000 " an efficient multiuser loading algorithm for OFDM based broadband wirelesssystems " is carried out, promptly H K = 1 N Σ n = 1 N | h K , n | 2 . Then, user K is with its minimum transmission rate request information R that can accept Min KAnd average channel gain feeds back to the base station, i.e. flow process among Fig. 1 101.
As the flow process among Fig. 1 102, the base station utilizes the minimum transmission rate request information R of user K feedback Min KAnd average channel gain information estimates to satisfy the needed minimum number of sub carrier wave N of basic service demand of user K Min K, promptly N min K = ceil ( R min K / R max ) , R wherein MaxRepresent the peak transfer rate that each subcarrier can allow, its numerical value depends on the coded modulation scheme that system adopts, and ceil (x) expression rounds real number x towards the positive infinity direction.Then, the minimum number of sub carrier wave sum Σ that all users need among the base station statistics set U K=1 KN Min kIf, Σ K=1 KN Min kSurpass available total number of sub-carriers order N in the system, promptly Σ k = 1 K N min u > N , Distribute any subcarrier, the current basic service demand that does not have enough frequency resources to come supporting user K of the system that is to say then for user K; If Σ K=1 KN Min kBe not more than total number of sub-carriers order N available in the system, promptly Σ k = 1 K N min k ≤ N , The system of then indicating has enough frequency resources to support the basic service of user K, that is to say, can distribute N at least for user K Min KIndividual subcarrier.This moment, the base station was just with this N Min KNumerical information and do not notified the user K, i.e. flow process among Fig. 1 103 by the subcarrier information of other K-1 CU.
As the flow process among Fig. 1 104, user K receives after the notice of base station, its channel sound on all N subcarriers is arranged from big to small according to amplitude gain,, in not by the subcarrier of other K-1 CU, once selected N from big to small then as the flow process among Fig. 1 105 Min KThe corresponding subcarrier of individual gain.Last as the flow process among Fig. 1 106, user K is with the N that selects Min KIndividual definite subcarrier information feeds back to the base station, thereby carries out the business transmission according to this agreement in next event elements.
Certainly; embodiment provided by the invention is just for the method that realizes subcarrier allocation in the OFDMA system that provides according to content of the present invention at large is provided; thereby all be exemplary execution mode; it can not be regarded as for restriction of the present invention; and every conspicuous modification within aim of the present invention is also due within protection scope of the present invention.

Claims (6)

1. the self-adaptive method for allotting sub carriers in the orthogonal frequency division multiplexing multiple access connecting system, the subcarrier of the required distribution of existing subscriber is determined in the system, before the user's who needs connecting system business transmission does not finish, existing subscriber's subcarrier allocation situation does not change, and it is characterized in that comprising the steps:
The first step: need the user of connecting system that service transmission rate demand and the average channel conditions on whole carrier wave are uploaded to the base station;
Second step: the base station decision can be distributed to the above-mentioned minimum number of sub carrier wave N that needs the user of connecting system Min K, to guarantee to satisfy this user's basic service demand;
The 3rd step: the base station should minimum number of sub carrier wave information N Min KAnd do not notified the above-mentioned user who needs connecting system by the subcarrier information of other CUs;
The 4th step: the above-mentioned user who needs connecting system will not arranged according to order from big to small by the gain of the channel magnitude on the subcarrier of other CUs;
The 5th step: the above-mentioned user who needs connecting system once selects N according to order from big to small from above-mentioned amplitude gain in not by the subcarrier of other CUs Min KThe corresponding subcarrier of individual gain;
The 6th step: above-mentionedly need the user of connecting system with this N Min KIndividual definite subcarrier information feeds back to the base station.
2. method according to claim 1 is characterized in that the average channel conditions in the above-mentioned first step comprises average channel gain.
3. method according to claim 2 is characterized in that above-mentioned average channel gain H K = 1 N Σ n = 1 N | h K , n | 2 , Wherein, N represents total number of sub-carriers order available in the system, h K, nRepresent the channel response on each subcarrier, K represents to have had in the said system K-1 user allocation of subcarriers.
4. method according to claim 3 is characterized in that the minimum number of sub carrier wave in above-mentioned second step N min K = ceil ( R min K / R max ) , wherein, R Min KRepresent minimum transmission rate request information, R MaxRepresent the peak transfer rate that each subcarrier can allow, its numerical value depends on the coded modulation scheme that system adopts, and ceil (x) expression rounds real number x towards the positive infinity direction, and K represents to have had in the said system K-1 user allocation of subcarriers.
5. method according to claim 4 is characterized in that the basic service demand in above-mentioned second step comprises the service transmission rate demand.
6. method according to claim 4, it is characterized in that the minimum number of sub carrier wave sum that other all user's needs are added up in the base station in above-mentioned second step, if the minimum number of sub carrier wave sum that above-mentioned other all users need surpasses available total number of sub-carriers order in the system, then do not need the user of connecting system to distribute any subcarrier to above-mentioned; If the minimum number of sub carrier wave sum that above-mentioned other all users need is not more than total number of sub-carriers order available in the system, the system of then indicating can be the above-mentioned user's allocation of subcarriers that needs connecting system.
CN2006100869830A 2006-06-22 2006-06-22 Self-adaptive method for allotting sub carriers in orthogonal frequency division multiplexing multiple access system Expired - Fee Related CN101094215B (en)

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PCT/CN2006/003739 WO2008000117A1 (en) 2006-06-22 2006-12-30 A self-apapting subcarrier allocation method in orthogonal frequency division multiple access system

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CN104104639A (en) * 2014-01-16 2014-10-15 中山大学 Resource allocation algorithm based on NC-OFDM
CN106211348A (en) * 2015-05-07 2016-12-07 电信科学技术研究院 The method and device that a kind of multiple access accesses

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WO2012167563A1 (en) * 2011-11-17 2012-12-13 华为技术有限公司 Carrier aggregation scheduling device, carrier aggregation scheduling method, and base station
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CN104104639A (en) * 2014-01-16 2014-10-15 中山大学 Resource allocation algorithm based on NC-OFDM
CN106211348A (en) * 2015-05-07 2016-12-07 电信科学技术研究院 The method and device that a kind of multiple access accesses
CN106211348B (en) * 2015-05-07 2019-07-05 电信科学技术研究院 A kind of method and device of multiple access access

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