CN100375439C - Method for assigning bandwidth in broadband wireless access system complied with IEEE802.16 standard - Google Patents
Method for assigning bandwidth in broadband wireless access system complied with IEEE802.16 standard Download PDFInfo
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- CN100375439C CN100375439C CNB2004101015053A CN200410101505A CN100375439C CN 100375439 C CN100375439 C CN 100375439C CN B2004101015053 A CNB2004101015053 A CN B2004101015053A CN 200410101505 A CN200410101505 A CN 200410101505A CN 100375439 C CN100375439 C CN 100375439C
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Abstract
The present invention discloses an IEEE 802.16 standard following bandwidth allocation method of a broadband wireless access system. The method comprises steps that in the upstream and the downstream directions, a base station converts all connection relating QoS parameters, for example, minimum upstream and downstream ensuring bandwidth, into reference variables for the bandwidth allocation of terminals according to the terminals which apply for bandwidth, and allocation dispatch with the terminals as objects is carried out on the total bandwidth; in the downstream direction, the base station carries out bandwidth reallocation with connection as objects strictly according to the IEEE 802.16 standard on the basis of the total bandwidth acquired by the connection of the terminals; in the upstream direction, all the terminals acquire bandwidth information of the terminals which is allocated by the base station and carries out bandwidth reallocation with connection as objects in respective allocated bandwidth strictly according to the IEEE 802.16 standard. When the present invention is used, the efficiency of bandwidth dispatch can be increased, the rationality and the timeliness of bandwidth allocation are ensured so as to greatly reduce system loads, and every terminal user's deserved rights and benefits are ensured.
Description
Technical field
The present invention relates to a kind of broadband wireless access (BWA, Broadband Wireless Access) bandwidth allocation methods of system, especially relate to a kind of employing OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) modulation demodulation system, follow the bandwidth allocation methods of the BWA of IEEE802.16 standard.
Background technology
In recent years, owing to there is not unified BWA standard, from Hang Qidao, makes on the market that existing BWA system all can't intercommunication by each manufacturer, thereby limited the development space of BWA product greatly.Therefore, 802.16 agreements that IEEE (IEEE) tissue is released will finish the trouble waters that the BWA standard is fragmented a country by rivaling warlords, for the development of BWA system provides an excellent opportunity.
In the IEEE802.16 agreement, having proposed to connect (connection) is the notion that object carries out allocated bandwidth.Between each terminal (SS, Subscriber Station) and the base station (BS, Base Station),, will set up some unidirectional connections with certain QoS (Quality ofService, quality of service) attribute in order to realize the transmission of data.At down direction, BS will directly carry out allocated bandwidth and scheduling according to the attribute of each connection; At up direction, the up connection of each on the SS will send bandwidth request to BS according to the needs of oneself, and BS carries out allocated bandwidth according to the QoS attribute that connects again after receiving these bandwidth request.
Yet, owing to stipulate about OFDM in the IEEE802.16d agreement, promptly must be according to the descending of modulation system robustness in each burst of descender, the appearance of OFDM symbol simultaneously makes that the result of allocated bandwidth can only be the integral multiple of OFDM symbol.Therefore, in actual implementation procedure, if fully only to be connected to institute that object realizes allocated bandwidth in steps, so at terminal and number of connection more for a long time, will produce bigger load or bandwidth waste to allocated bandwidth on the BS and scheduler module, and, according to 802.16 system requirements, each frame all will dynamically carry out the distribution of bandwidth, will cause the inefficiency of bandwidth scheduling like this, even be difficult to realize, and then have a strong impact on the overall performance of system.
Simultaneously, when the connection priority on each terminal under the same BS differed bigger, the terminal that can make certain have the lower priority connection can not be obtained relatively fully resource, thereby can not guarantee the due interests of each terminal use.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard, adopt this method can improve the efficient of bandwidth scheduling, guarantee the reasonability and the promptness of allocated bandwidth, and then the load of mitigation system greatly, and ensure each terminal use's entitlement.
In order to solve the problems of the technologies described above, the invention provides a kind of bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard, this method comprises the steps:
(a) on up, down direction, carry out with the terminal total bandwidth according to the QoS parameter of all relevant connections of terminal of bandwidth application the base station is the allocation schedule of object, and makes up down link medium access control distributorship agreement information and up link medium access control distributorship agreement information;
(b) on down direction, the base station is connecting on the total bandwidth basis that obtains under the terminal, carries out to be connected to the bandwidth reallocation of object; On up direction, each terminal is obtained the bandwidth information of base station assigns, reallocates in the bandwidth of carrying out in the bandwidth to be connected to object of distributing separately.
Further, the present invention also has following characteristics: in the described step (a), on down direction, described QoS parameter is that the minimum of the terminal of bandwidth application guarantees the downlink bandwidth number; On up direction, described QoS parameter is that the minimum of the terminal of bandwidth application guarantees the upstream bandwidth number.
Further, the present invention also has following characteristics, and described step (a) is further divided into following steps:
(a1) base station calculates the overall minimum OFDM symbol number that guarantees uplink and downlink bandwidth sum and base station present frame of the terminal of bandwidth application;
(a2) on down direction, the terminal of the bandwidth application that obtains in the determining step (a1) overall minimum guarantees the downlink bandwidth sum whether greater than the OFDM symbol number of base station present frame, if greater than, execution in step (a3) then, otherwise execution in step (a4); On up direction, the terminal of the bandwidth application that obtains in the determining step (a1) overall minimum guarantees the upstream bandwidth sum whether greater than the OFDM symbol number of base station present frame, if greater than, execution in step (a3) then, otherwise execution in step (a4);
(a3) on down direction, the base station adopts sliding window mechanism that each terminal is carried out allocated bandwidth, and each terminal all is assigned to satisfies the bandwidth that minimum separately assurance downlink bandwidth is counted requirement at least, and execution in step (a5); On up direction, the base station adopts sliding window mechanism that each terminal is carried out allocated bandwidth, and each terminal all is assigned to satisfies the bandwidth that minimum separately assurance upstream bandwidth is counted requirement at least, and execution in step (a5);
(a4) on down direction, the base station guarantees the downlink bandwidth number to each terminal distribution OFDM symbol number according to the minimum of each terminal, each terminal all is assigned to satisfies the bandwidth that minimum separately assurance downlink bandwidth is counted requirement at least; On up direction, the base station guarantees the upstream bandwidth number to each terminal distribution OFDM symbol number according to the minimum of each terminal, each terminal all is assigned to satisfies the bandwidth that minimum separately assurance upstream bandwidth is counted requirement at least;
(a5) arrange on sequential terminal according to modulation coding mode the base station, makes up up link medium access control distributorship agreement information and down link medium access control distributorship agreement information.
Further, the present invention also has following characteristics, and described step (a1) is further divided into following steps:
(a11) live part of OFDM symbol is calculated according to current total bandwidth meter in the base station, obtains the OFDM symbol total length according to current Cyclic Prefix again, and calculates the OFDM symbol number of base station present frame;
(a12) on up direction, the base station calculates the current uplink data rate of each terminal by obtaining the information of the presently used uplink burst configuration file of each terminal; On down direction, the base station calculates the current downlink data rate of each terminal by obtaining the information of the presently used downlink burst configuration file of each terminal;
(a13) on up direction, the uplink data rate that the base station is current according to each terminal is collected the required bandwidth information of connection of the up correspondence of current each terminal, and reserves competition initial ranging zone and competition bandwidth request region; On down direction, the downlink data rate that the base station is current according to each terminal is collected the required bandwidth information of connection of the descending correspondence of current each terminal;
(a14) on up direction, the base station calculates the OFDM symbol of the current required upstream bandwidth of each terminal and counts summation; On down direction, the base station calculates the OFDM symbol of the current required downlink bandwidth of each terminal and counts summation;
(a15) on up direction, the summation addition is counted with the OFDM symbol of the current required upstream bandwidth of each terminal in the base station, obtains the overall minimum upstream bandwidth sum that guarantees of terminal; On down direction, the summation addition is counted with the OFDM symbol of the current required downlink bandwidth of each terminal in the base station, obtains the overall minimum downlink bandwidth sum that guarantees of terminal.
Further, the present invention also has following characteristics: sliding window mechanism is as the sliding window size with the OFDM symbol number after the residue except that broadcast area in the described step (a3), the terminal point of sub-distribution window was as the starting point of this sub-distribution window in the past, to the terminal in window, guarantee that by the minimum of terminal the bandwidth number distributes the OFDM symbol number successively.
Further, the present invention also has following characteristics, and described step (a4) is further divided into following steps:
(a41) on down direction, its minimum required OFDM symbol number of downlink bandwidth number that guarantees is satisfied to each terminal distribution respectively in the base station; On up direction, its minimum required OFDM symbol number of upstream bandwidth number that guarantees is satisfied to each terminal distribution respectively in the base station;
(a42) whether judge the remaining OFDM symbol number in distribution back greater than the number of terminals that still has bandwidth demand, if greater than, execution in step (a43), otherwise execution in step (a45);
(a43) base station is to the terminal that the still has bandwidth demand OFDM symbol of reallocating respectively;
(a44) whether also there is the terminal that still has bandwidth demand and do not reach this terminal maximum constraints bandwidth after judgement distributes,, then returns step (a42) if exist, otherwise execution in step (a46);
(a45) base station is carried out from large to small ordering to the terminal that respectively still has bandwidth demand according to separately bandwidth demand, still have the terminal of bandwidth demand to distribute an OFDM symbol successively according to this ordering from large to small to each, until distributing remaining OFDM symbol number, execution in step (a5) then;
(a46) if satisfied behind the bandwidth demand of all terminals still residual quadrature frequency division multiplexing symbol number, so residual quadrature frequency division multiplexing symbol number is all filled.
Compared with prior art, the present invention's bandwidth allocation methods of following the BWA of IEEE802.16 standard has the following advantages;
The present invention is applied to follow the bandwidth allocation methods of the BWA of IEEE802.16 standard, adopt the latter linked secondary allocated bandwidth of first terminal system, be the qos parameter of base station elder generation according to all relevant connections of terminal of bandwidth application, for example: the minimum uplink and downlink bandwidth number that guarantees, be scaled the allocated bandwidth reference variable to terminal, it is the allocation schedule of object that total bandwidth is carried out with the terminal; Then on this basis, respectively with the distribution bandwidth of each terminal as resource, each subterminal connection is realized final allocated bandwidth.Therefore, the scheduling quantity when adopting this method to reduce to carry out allocated bandwidth in the prior art, and eliminated the coupling factor that existing scheduling exists, alleviated the load of system greatly; Because each terminal is enjoyed the bandwidth authority of equality, can ensure each terminal use's maximum rights and interests again.
Description of drawings
Fig. 1 is the schematic flow sheet of down direction in the bandwidth allocation methods of the present invention's BWA of being applied to follow the IEEE802.16 standard;
Fig. 2 is the schematic flow sheet of up direction in the bandwidth allocation methods of the present invention's BWA of being applied to follow the IEEE802.16 standard;
Fig. 3 is the sliding window schematic diagram of related sliding window mechanism among the present invention.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
Present embodiment is described according to the uplink and downlink both direction, and the allocated bandwidth priority of setting each terminal equates that on down direction, QoS parameter is that the minimum of the terminal of bandwidth application guarantees the downlink bandwidth number; On up direction, QoS parameter is that the minimum of the terminal of bandwidth application guarantees the upstream bandwidth number.
As shown in Figure 1, on down direction, this method comprises the steps:
Whether step 104, the OFDM symbolic number of judging the BS present frame less than the overall minimum downlink bandwidth sum that guarantees of terminal, if less than, then execution in step 105, otherwise execution in step 106;
Whether step 107 is judged and is distributed the remaining OFDM symbolic number in back greater than the number of terminals that still has bandwidth demand, if greater than, execution in step 108, otherwise execution in step 110;
As shown in Figure 2, on up direction, this method comprises the steps:
Whether step 205, the OFDM symbolic number of judging the BS present frame less than the overall minimum upstream bandwidth sum that guarantees of terminal, if less than, then execution in step 206, otherwise execution in step 207;
Whether step 208 is judged and is distributed the remaining OFDM symbolic number in back greater than the number of terminals that still has bandwidth demand, if greater than, execution in step 209, otherwise execution in step 211;
The present invention be directed to the new method that realizes allocated bandwidth in the BWA system that follows the IEEE802.16 standard, this method is to take all factors into consideration to influence the optimal solution that all factors of allocated bandwidth provide in the IEEE802.16 standard card cage, has good Bandwidth Management effect.
Claims (6)
1. a bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard is characterized in that, comprises the steps:
(a) on up, down direction, carry out with the terminal total bandwidth according to the QoS parameter of all relevant connections of terminal of bandwidth application the base station is the allocation schedule of object, and makes up down link medium access control distributorship agreement information and up link medium access control distributorship agreement information;
(b) on down direction, the base station is connecting on the total bandwidth basis that obtains under the terminal, carries out to be connected to the bandwidth reallocation of object; On up direction, each terminal is obtained the bandwidth information of base station assigns, reallocates in the bandwidth of carrying out in the bandwidth to be connected to object of distributing separately.
2. the bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard according to claim 1, it is characterized in that: in the described step (a), on down direction, described QoS parameter is that the minimum of the terminal of bandwidth application guarantees the downlink bandwidth number; On up direction, described QoS parameter is that the minimum of the terminal of bandwidth application guarantees the upstream bandwidth number.
3. the bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard according to claim 2 is characterized in that step (a) is further divided into following steps:
(a1) base station calculates the overall minimum OFDM symbol number that guarantees uplink and downlink bandwidth sum and base station present frame of the terminal of bandwidth application;
(a2) on down direction, the terminal of the bandwidth application that obtains in the determining step (a1) overall minimum guarantees the downlink bandwidth sum whether greater than the OFDM symbol number of base station present frame, if greater than, execution in step (a3) then, otherwise execution in step (a4); On up direction, the terminal of the bandwidth application that obtains in the determining step (a1) overall minimum guarantees the upstream bandwidth sum whether greater than the OFDM symbol number of base station present frame, if greater than, execution in step (a3) then, otherwise execution in step (a4);
(a3) on down direction, the base station adopts sliding window mechanism that each terminal is carried out allocated bandwidth, and each terminal all is assigned to satisfies the bandwidth that minimum separately assurance downlink bandwidth is counted requirement at least, and execution in step (a5); On up direction, the base station adopts sliding window mechanism that each terminal is carried out allocated bandwidth, and each terminal all is assigned to satisfies the bandwidth that minimum separately assurance upstream bandwidth is counted requirement at least, and execution in step (a5);
(a4) on down direction, the base station guarantees the downlink bandwidth number to each terminal distribution OFDM symbol number according to the minimum of each terminal, each terminal all is assigned to satisfies the bandwidth that minimum separately assurance downlink bandwidth is counted requirement at least; On up direction, the base station guarantees the upstream bandwidth number to each terminal distribution OFDM symbol number according to the minimum of each terminal, each terminal all is assigned to satisfies the bandwidth that minimum separately assurance upstream bandwidth is counted requirement at least;
(a5) arrange on sequential terminal according to modulation coding mode the base station, makes up up link medium access control distributorship agreement information and down link medium access control distributorship agreement information.
4. the bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard according to claim 3 is characterized in that described step (a1) is further divided into following steps:
(a11) live part of OFDM symbol is calculated according to current total bandwidth meter in the base station, obtains the OFDM symbol total length according to current Cyclic Prefix again, and calculates the OFDM symbol number of base station present frame;
(a12) on up direction, the base station calculates the current uplink data rate of each terminal by obtaining the information of the presently used uplink burst configuration file of each terminal; On down direction, the base station calculates the current downlink data rate of each terminal by obtaining the information of the presently used downlink burst configuration file of each terminal;
(a13) on up direction, the uplink data rate that the base station is current according to each terminal is collected the required bandwidth information of connection of the up correspondence of current each terminal, and reserves competition initial ranging zone and competition bandwidth request region; On down direction, the downlink data rate that the base station is current according to each terminal is collected the required bandwidth information of connection of the descending correspondence of current each terminal;
(a14) on up direction, the base station calculates the OFDM symbol of the current required upstream bandwidth of each terminal and counts summation; On down direction, the base station calculates the OFDM symbol of the current required downlink bandwidth of each terminal and counts summation;
(a15) on up direction, the summation addition is counted with the OFDM symbol of the current required upstream bandwidth of each terminal in the base station, obtains the overall minimum upstream bandwidth sum that guarantees of terminal; On down direction, the summation addition is counted with the OFDM symbol of the current required downlink bandwidth of each terminal in the base station, obtains the overall minimum downlink bandwidth sum that guarantees of terminal.
5. the bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard according to claim 4, it is characterized in that: sliding window mechanism is as the sliding window size with the OFDM symbol number after the residue except that broadcast area in the described step (a3), the terminal point of sub-distribution window was as the starting point of this sub-distribution window in the past, to the terminal in window, guarantee that by the minimum of terminal the bandwidth number distributes the OFDM symbol number successively.
6. the bandwidth allocation methods that is applied to follow the BWA of IEEE802.16 standard according to claim 5 is characterized in that described step (a4) is further divided into following steps:
(a41) on down direction, its minimum required OFDM symbol number of downlink bandwidth number that guarantees is satisfied to each terminal distribution respectively in the base station; On up direction, its minimum required OFDM symbol number of upstream bandwidth number that guarantees is satisfied to each terminal distribution respectively in the base station;
(a42) whether judge the remaining OFDM symbol number in distribution back greater than the number of terminals that still has bandwidth demand, if greater than, execution in step (a43), otherwise execution in step (a45);
(a43) base station is to the terminal that the still has bandwidth demand OFDM symbol of reallocating respectively;
(a44) whether also there is the terminal that still has bandwidth demand and do not reach this terminal maximum constraints bandwidth after judgement distributes,, then returns step (a42) if exist, otherwise execution in step (a46);
(a45) base station is carried out from large to small ordering to the terminal that respectively still has bandwidth demand according to separately bandwidth demand, still have the terminal of bandwidth demand to distribute an OFDM symbol successively according to this ordering from large to small to each, until distributing remaining OFDM symbol number, execution in step (a5) then;
(a46) if satisfied behind the bandwidth demand of all terminals still residual quadrature frequency division multiplexing symbol number, so residual quadrature frequency division multiplexing symbol number is all filled.
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CN100399781C (en) * | 2005-01-20 | 2008-07-02 | 中国科学院计算技术研究所 | Terminal up dispatching method for voice service in wide band wireless cut-in network |
CN101119377B (en) * | 2006-08-03 | 2011-12-07 | 财团法人资讯工业策进会 | Wireless communication system, method, and computer readable recording medium thereof for assigning frame structure and transmitting data based on ieee 802.16j standard |
US9253711B2 (en) | 2006-10-02 | 2016-02-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Conditional parallel execution of access stratum (AS) and non-access stratum (NAS) signaling |
CN101198165B (en) * | 2007-10-19 | 2011-08-24 | 中兴通讯股份有限公司 | Resource admission control method |
CN101222441B (en) * | 2008-01-29 | 2011-07-13 | 北京北方烽火科技有限公司 | WiMAX ascending scheduling and band width distribution method |
CN101547511B (en) * | 2008-03-27 | 2013-04-24 | 华为技术有限公司 | Uplink resource allocating method and user equipment |
CN101257451B (en) * | 2008-04-16 | 2011-04-20 | 中兴通讯股份有限公司 | Method for MAC layer to rank downlink data burst of WiMAX system |
US8743863B2 (en) | 2008-08-20 | 2014-06-03 | Qualcomm Incorporated | Method for ranging devices using code sequences in WLANs |
CN102083224B (en) * | 2010-04-06 | 2013-06-12 | 电信科学技术研究院 | Contention-based uplink data transmission method and device |
CN102571453B (en) * | 2012-02-20 | 2015-04-29 | 浪潮(北京)电子信息产业有限公司 | Facility resource pool management method and system |
US8989667B2 (en) * | 2012-03-28 | 2015-03-24 | Debanjan Mukherjee | Apparatus and methods for a bandwidth efficient scheduler |
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US6657983B1 (en) * | 1999-10-29 | 2003-12-02 | Nortel Networks Limited | Scheduling of upstream traffic in a TDMA wireless communications system |
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