CN101212410A - Downlink resource scheduling method, system, and device - Google Patents
Downlink resource scheduling method, system, and device Download PDFInfo
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Abstract
The invention discloses a method for realizing a downlink resource scheduling. The method comprises the steps: A. a scheduling grade of a user terminal is determined by a base station according to a state parameter of a business flow of the user terminal; B. a sub-band is distributed for the user terminal by the base station according to the scheduling grade of the user terminal and channel information feed-backed by the user terminal to the base station; C. an upper arrival packet of the user terminal is sent to the user terminal by the base station according to the sub-band. The invention also discloses a system for realizing the downlink scheduling and a device thereof. Through the method, the device and the system provided by the invention, by using the channel state information feed-backed by the user terminal, system resource is dynamically distributed for the user terminal; a resource distribution among the user terminals is effectively realized; throughput capacity of the system is maximized.
Description
Technical field
The present invention relates to communication technical field, in particular, is a kind of method, system and device of realizing scheduling downlink resource.
Background technology
For providing, user terminal has more that the multimedia service of high data rate and various service quality (QoS) demand is one of characteristic of next generation mobile communication system.But high data rate will cause decline of serious frequency selectivity and intersymbol interference (ISI), can effectively address the above problem by OFDM (OFDM) technology.It is strong that orthogonal frequency division multiplexi has anti-fading ability, and anti-intersymbol interference ability is strong, and the frequency efficiency height is fit to advantages such as high-speed data and non-symmetrical service transmission.The design feature of a plurality of subcarriers of OFDM makes system carry out Adaptive Modulation and bit power distribution according to channel information, thereby the performance of system can be provided greatly.Orthogonal frequency division multiplexi is being widely used in recent years, successfully be used for systems such as digital video electric wave (DVB), asymmetric user data ring (ADSL) and wireless access network, become the transmission technology that has very much development prospect in the next generation mobile communication system.In multi-user orthogonal frequency division multiplexing system, all users compete sub-carrier resources, therefore, scheduling sub-carriers resource how, make and take into account fairness between the user terminal when multi-user orthogonal frequency division multiplexing system has higher spectrum efficiency, and can be problems of a key for each user terminal provides multimedia services such as the voice that comprise the different service quality demand, video, data.
At present based on the multi-user's of OFDM bag dispatching method, be assumed to be single professional scene of planting mostly, when perhaps relating to multiple business, suppose that often each user terminal has only a kind of business, and do not exist the resource of multiple business in the unique user terminal to use problem, and do not meet the growth requirement of multimedia service in the present mobile communication like this, especially in to the very high down link of multimedia service demand.
In sum, in the OFDM dispatching method of prior art, only provide the dispatching method of the single business that solves a user terminal usually, and do not relate to the dispatching method of the multiple business that solves a plurality of user terminals.
Summary of the invention
The invention provides a kind of method, system and device of realizing scheduling downlink resource, be applied in the ofdm system, be used to solve the problem that OFDM dispatching method of the prior art does not relate to the scheduling of the multiple business that solves a plurality of user terminals.
The invention provides a kind of method that realizes scheduling downlink resource, be applied in the ofdm system, the subcarrier of each time slot in the described ofdm system is divided into a subband more than, and each subband comprises a subcarrier more than, and this method may further comprise the steps:
A, described base station determine the scheduling rank of this user terminal according to the state parameter of the Business Stream of user terminal;
B, described base station are this user terminal allocated subbands according to scheduling rank and this user terminal of described user terminal to the channel information of base station feedback;
C, described base station arrive bag by described subband to the upper strata that this user terminal sends this user terminal.
The channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal;
Then step B comprises:
B1, described base station as the current sub number, judge in the channel information of an above user terminal feedback whether comprise this subband number with subband number to be allocated, if having, then select a user terminal from a described above user terminal;
This user terminal is distributed to described current sub in B2, described base station.
From a described above user terminal, select the step of a user terminal to comprise among the step B1:
B11, described base station be according to the modulating-coding pattern of the spendable subband of each user terminal, and the corresponding relation of default modulating-coding pattern and the speed of subband, inquires about obtaining the speed that each user terminal is supported on spendable subband;
B12, described base station will use the scheduling rank of user terminal of described current sub and the speed that described this user terminal is supported on spendable subband to multiply each other, and select the user terminal of product numerical value maximum.
Steps A comprises:
A1, described base station determine the priority of each Business Stream of this user terminal according to the state parameter of the Business Stream of described user terminal;
A2, described base station are provided with the scheduling rank of this user terminal according to the priority of each Business Stream of this user terminal.
In described base station, fifo queue is set respectively for the more than one Business Stream of each user terminal, wherein, the corresponding user terminal identification of each user terminal, the corresponding a kind of class of business sign of each Business Stream and QoS parameter, before steps A, this method also comprises:
A0, described base station arrive user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue;
Then step C comprises:
C1, described base station be according to the priority orders of each Business Stream of this user terminal, the upper strata in the fifo queue of each Business Stream correspondence of described user terminal arrived packing be downloaded on the subband that distributes into this user terminal;
C2, described base station send the upper strata that is loaded on the described subband to described user terminal and arrive bag.
Described state parameter comprises: the normalization time delay of the satisfaction factor, normalized packet loss and traffic stream queues head bag.
The invention provides a kind of system that realizes scheduling downlink resource, be applied in the ofdm system, the subcarrier of each time slot is divided into a subband more than in the described ofdm system, and each subband comprises a subcarrier more than, and this system comprises:
The base station is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback; Arrive bag by described subband to the upper strata that this user terminal sends this user terminal;
User terminal is used for to the base station feedback channel information.
Described base station comprises:
Control unit is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal;
Allocation units, scheduling rank and this user terminal of being used for according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback;
Transmitting element is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
The channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal,
Then described allocation units comprise,
First performance element is used for subband number to be allocated as the current sub number, judges in the channel information of an above user terminal feedback whether comprise this subband number, if having, then selects a user terminal from a described above user terminal;
First is provided with the unit, is used for described current sub is distributed to this user terminal.
Described first performance element comprises:
Query unit is used for the modulating-coding pattern according to the spendable subband of each user terminal, and the corresponding relation of the speed of default modulating-coding pattern and subband, and inquiry obtains the speed that each user terminal is supported on spendable subband;
Computing unit will use the scheduling rank of the user terminal of described current sub to multiply each other with the speed that described this user terminal is supported on spendable subband, the user terminal of selection product numerical value maximum.
Described control unit comprises:
Second performance element is used for the state parameter according to the Business Stream of described user terminal, determines the priority of each Business Stream of this user terminal;
Second is provided with the unit, is used for being provided with according to the priority of each Business Stream of this user terminal the scheduling rank of this user terminal.
In described base station, fifo queue is set respectively for the more than one Business Stream of each user terminal, wherein, the corresponding user terminal identification of each user terminal, the corresponding a kind of class of business sign of each Business Stream and QoS parameter, this system also comprises:
Taxon is used for arriving user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue;
Then described transmitting element comprises:
Load units is used for the priority orders according to each Business Stream of this user terminal, the upper strata in the fifo queue of each Business Stream correspondence of described user terminal is arrived packing be downloaded on the subband that distributes into this user terminal;
Then described transmitting element sends the upper strata that is loaded on the described subband to described user terminal and arrives bag.
Described state parameter comprises: the normalization time delay of the satisfaction factor, normalized packet loss and traffic stream queues head bag.
The invention provides a kind of base station, be applied in the ofdm system, the subcarrier of each time slot in the described ofdm system is divided into a subband more than, each subband comprises a subcarrier more than, and this base station comprises:
Scheduling unit is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback;
Transmitting element is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
By method, system and device of the present invention, can utilize the channel condition information of user terminal feedback, dynamic is the user terminal distributing system resource, between user terminal, effectively realize resource allocation, the system resource that the unique user terminal distribution is obtained reasonably is arranged in the multiple business of this user terminal foundation the throughput of maximization system.Show that by simulation result method, system and device provided by the invention in different multimedia services can provide good performance aspect each index, be suitable for next generation mobile communication networks development needs.
Description of drawings
Fig. 1 is for realizing the method schematic diagram of multiple users multi-service packet scheduling among the present invention;
Fig. 2 is for realizing the schematic flow sheet of multiple users multi-service packet scheduling among the present invention;
Fig. 3 A is for realizing the system schematic of multiple users multi-service packet scheduling among the present invention;
Fig. 3 B is the base station of realization multiple users multi-service packet scheduling and the structural representation of user terminal among the present invention;
Fig. 4 A is the structural representation of the allocation units of base station among the present invention;
Fig. 4 B is the structural representation of first performance element of base station among the present invention;
Fig. 5 is the structural representation of the control unit of base station among the present invention;
Fig. 6 is the structural representation of the transmitting element of base station among the present invention;
Fig. 7 is the structural representation of the base station of realization multiple users multi-service packet scheduling provided by the invention.
Embodiment
In order to reach the purpose that realizes the multi-business scheduling of multiple users in comprising the ofdm system of multiple users, in the present invention, the scheduling rank of this user terminal is determined according to the state parameter of the Business Stream of user terminal in described base station; Described base station is this user terminal allocated subbands according to scheduling rank and this user terminal of described user terminal to the channel information of base station feedback; Described base station arrives bag by described subband to the upper strata that this user terminal sends this user terminal.
Have certain correlation between the ofdm system sub-carriers, directly the subcarrier described in the system is dispatched, the feedback quantity of channel will strengthen.Common way is, subcarrier is divided into some groups, and every group of subcarrier is called a subband, and user terminal communicates by the competition subband.For example, R adjacent in ofdm system sub carrier group becomes a subband, and N subcarrier is divided into M subband, then N=M*R.The least resource unit of dispatching in ofdm system is a subband in the middle of the time slot, and each time slot is made up of fixing OFDM symbol, and supposes that channel is quasi-static in single time slot.Ofdm system has utilized adaptive coding modulation (AMC), thereby can support variable transmission digit rate.In each time slot, user terminal estimate on each subband average signal-to-noise ratio (SNR) and to the base station feedback channel information.The described channel information of user terminal feedback comprises: Q spendable subband number of user terminal and each self-corresponding modulating-coding pattern (MCS) of these channels, the spendable subband of user terminal described here is several bigger subbands of SNR value.The number of sub-bands Q of user terminal described here feedback is less than total number of sub-bands M, and system can adjust the size of feedback number of sub-bands Q, thereby coordinates the relation between uplink feedback information quantity and the descending multi-user diversity.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
Referring to shown in Figure 1, realize that in the present invention the method for the descending scheduling of ofdm system comprises:
Step 11: the scheduling rank of this user terminal is determined according to the state parameter of the Business Stream of user terminal in described base station.
Step 12: described base station is this user terminal allocated subbands according to scheduling rank and this user terminal of described user terminal to the channel information of base station feedback.
Step 13: described base station arrives bag by described subband to the upper strata that this user terminal sends this user terminal.
Described state parameter comprises: the normalization time delay of the satisfaction factor, normalized packet loss and traffic stream queues head bag.The priority of each Business Stream of this user terminal is determined according to the state parameter of the Business Stream of described user terminal in described base station.Described base station is provided with the scheduling rank of this user terminal according to the priority of each Business Stream of this user terminal.
The channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal; Described base station as the current sub number, judges in the channel information of an above user terminal feedback whether comprise this subband number with subband number to be allocated, if having, then selects a user terminal from a described above user terminal; This user terminal is distributed to described current sub in described base station.Described base station is according to the modulating-coding pattern of the spendable subband of each user terminal, and the corresponding relation of the speed of default modulating-coding pattern and subband, and inquiry obtains the speed that each user terminal is supported on spendable subband.Described base station will use the scheduling rank of user terminal of described current sub and the speed that described this user terminal is supported on spendable subband to multiply each other, and select the user terminal of product numerical value maximum.
For the more than one Business Stream of each user terminal is provided with fifo queue respectively, wherein, the corresponding user terminal identification of each user terminal, the corresponding a kind of class of business of each Business Stream identify and QoS parameter in described base station.Described base station arrives user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue.Then described base station is according to the priority orders of each Business Stream of this user terminal, the upper strata in the fifo queue of each Business Stream correspondence of described user terminal arrived packing be downloaded on the subband that distributes into this user terminal.Described base station sends the upper strata that is loaded on the described subband to described user terminal and arrives bag.
Referring to shown in Figure 2, realize that in the present invention the step of the descending scheduling of ofdm system comprises:
Step 201: the base station is that each Business Stream that user terminal has been set up is provided with corresponding fifo queue.
Step 202: described base station arrives user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, and described upper strata is arrived the bag classification.
Step 203: described base station arrives sorted upper strata in the fifo queue that wraps each the Business Stream correspondence that is kept at the user terminal of setting up base station described in the step 201.
Described base station is that user terminal is provided with several fifo queues, and each fifo queue is to a Business Stream of having set up that should user terminal.Described base station arrives user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag classify.Described base station arrives described upper strata of having classified in the fifo queue that wraps each the Business Stream correspondence that is saved in described each user terminal.
Step 204: the state parameter of each Business Stream that sends to user terminal is calculated in described base station.
Suppose that there are three kinds of different business in each user terminal: real-time voice business, real-time video traffic and non-real-time data business.The bag size of three kinds of business is obeyed different distributions respectively with the bag arrival rate, has different QoS requirements.In each time slot of ofdm system, described base station is at first for each Business Stream of each user terminal calculates its state parameter, and these parameters have reflected the basic status of a Business Stream.
The state parameter of the Business Stream that calculate described base station comprises: the satisfaction factor, normalized packet loss and traffic stream queues head (Head of Line, HOL) Bao normalization time delay.
The computational methods of the satisfaction factor:
Wherein, k is the numbering of user terminal, and j is the Business Stream numbering of user terminal k.Sent_bit
J, kBe the amount of bits of j the actual transmission of Business Stream of user terminal k in record window Tc, total_bit
J, kFor arriving the amount of bits of j all bags of traffic stream queues of user k among the record window Tc.S
J, kThe satisfaction of having represented a Business Stream is used for guaranteeing the fairness of the resource that each user terminal distributes in the ofdm system prevent that some business from obtaining too much resource, and other business obtaining very few resource.In native system, the record window Tc of real-time voice business, real-time video traffic and non-real-time data business is set to 40 milliseconds, 80 milliseconds and 200 milliseconds respectively.
The computational methods of normalized packet loss:
Wherein, k is the numbering of user terminal, and j is the Business Stream numbering of user terminal k.Loss_rate
J, kBe a packet loss (PLR) that Business Stream is current, loss_request
J, kFixedly packet loss threshold value for systemic presupposition.For simplifying the analysis, suppose that channel estimating is accurately, packet loss only results from the bag that does not send in the real time business in maximum delay.The current packet loss of real-time voice business, real-time video traffic is respectively less than 3% with less than 1% in native system.
The computational methods of the normalization time delay of traffic stream queues head bag:
Wherein, delay
J, kFor the traffic stream queues head wraps in time delay in the formation, promptly arrive formation and begin up till now constantly time interval from this queue heads bag.D
J, kFor the maximum delay threshold value of the Business Stream that is numbered j of the user terminal k of systemic presupposition, if promptly the bag of this Business Stream j can not be in time D
J, kIn send, then system abandons this bag.In the native system, the maximum delay of real-time voice business, real-time video traffic is respectively 40 milliseconds and 100 milliseconds.Only need calculate delay for real-time Business Stream
J, k, for non-real-time data is professional, delay
J, kBe set to 0.
Step 205: the scheduling rank of each Business Stream of user terminal is calculated in described base station according to the state parameter that calculates in the step 204.
Described base station is according to the scheduling rank of each Business Stream of each user terminal of normalization time-delay calculation of the satisfaction factor, normalized packet loss and traffic stream queues head bag.
Other computational methods of Business Stream scheduling level are:
Wherein
Be the urgent factor, it be one greater than 1, the numerical value that can be provided with by the base station.For a non-real-time service, because delay
J, kEqual 0, then
The value perseverance be 1, therefore this item to the scheduling rank of Business Stream less than influencing; And to real time business, under the identical situation of other factors, the time-delay of its queue heads bag is long more, and Pt will be big more.The scheduling rank of each Business Stream is to determine by this Several Factors of normalization time delay of the satisfaction factor of this Business Stream, normalized packet loss and traffic stream queues head bag is common, and base station assigns will be higher than non-real-time service for the scheduling rank of real time business.
Step 206: described base station is according to dispatching rank described in the step 205, according to each Business Stream ordering with this user terminal of from high to low order.
Step 207: the scheduling rank numerical value of the highest-ranking Business Stream of scheduling described in the step 206 of described base station is set to the scheduling rank of this user terminal.
Other computational methods of the scheduling level of user terminal are:
Wherein, Pt is the scheduling rank numerical value of all business of this user terminal, and the scheduling rank numerical value that highest-ranking Business Stream is dispatched in described base station is set to the scheduling rank numerical value of this user terminal.
Step 208: described base station is the user terminal allocated subbands.
Described base station is the user terminal allocated subbands according to the channel information of user terminal feedback and the scheduling rank of user terminal.The channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal.Described base station as the current sub number, judges in the channel information of an above user terminal feedback whether comprise this subband number with subband number to be allocated, if having, then selects a user terminal from a described above user terminal.This user terminal is distributed to described current sub in described base station.
The method of described base station assigns subband is:
Wherein, m is the subband number, C
M, kThe speed of on spendable subband m, being supported for user terminal k, i.e. the bit number of the Business Stream that can send in base station described in this time slot, this numerical value can be obtained by the default adaptive transmission scheme table of modulating-coding pattern numbering inquiry of user feedback.Ginseng is shown in Table 1, be the adaptive transmission scheme table of ofdm system in the analogue system, this system is the ofdm system of a single sub-district, has 512 subcarriers in the system, per 32 sub carrier group become a subband, promptly have 16 subbands in this system.In the emulation, suppose that all subbands all are used for transmitting data, slot length is 1 millisecond, fixingly is made up of 8 OFDM symbols.The present invention has taken all factors into consideration between the utilance of channel and each user terminal and the situation of each Business Stream of unique user terminal inner.
| Numbering | Modulation | Code rate | The demand signal to noise ratio | Bit/time slot |
| Modulating-coding pattern 1 | Binary phase shift keying | 1/4 | -3.4 | 64 |
| Modulating-coding pattern 2 | Binary phase shift keying | 1/2 | -0.4 | 128 |
| The modulating-coding mode 3 | Quaternary phase shift keying | 1/2 | 2.2 | 256 |
| Modulating-coding pattern 4 | Quaternary phase shift keying | 3/4 | 5.2 | 384 |
| Modulating-coding pattern 5 | The octal system phase shift keying | 2/3 | 7.6 | 512 |
| Modulating-coding pattern 6 | 16 quadrature amplitude modulation | 3/4 | 10.9 | 768 |
| The modulating-coding mode 7 | 64 quadrature amplitude modulation | 2/3 | 14.5 | 1024 |
Table 1 adaptive transmission scheme table
Step 209: described base station is after executing scheduling to all subbands according to step 208, and described base station arrives the upper strata of user terminal in packing and is downloaded to this user terminal and distributes on the subband that obtains.
Here, described base station is downloaded to upper strata arrival packing on the subband that distributes into this user terminal from high to low according to the scheduling rank numerical value of each Business Stream of user terminal.For example, subband 1 has been distributed to user terminal 3, then described base station at first from all Business Streams of described user terminal 3 Business Stream of selection scheduling rank numerical value maximum load bag, if the bag of this Business Stream can't be loaded with full described subband 1, get bag in the next Business Stream of then described base station in the order of the scheduling rank numerical value of all Business Streams of described user terminal 3, till described subband 1 is loaded with full, or all do not have in the fifo queue of all Business Streams of described user terminal 3 till the bag.
Shown in Fig. 3 A, realize that the system of multiple users multi-service packet scheduling of the present invention comprises: base station 31, user terminal 32.
Described base station 31 is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback; Arrive bag by described subband to the upper strata that this user terminal sends this user terminal;
Described user terminal 32 is used at each time slot to the base station feedback channel information.
Shown in Fig. 3 B, the base station 31 among the present invention comprises: control unit 311, allocation units 312, transmitting element 313.
Transmitting element 313 is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
Shown in Fig. 4 A, described allocation units 312 comprise: first performance element 41, first is provided with unit 42.
Described first performance element 41, be used for subband number to be allocated as the current sub number, judge in the channel information of an above user terminal feedback whether comprise this subband number,, then from a described above user terminal, select a user terminal if having;
Described first is provided with unit 42, is used for described current sub is distributed to this user terminal.
Shown in Fig. 4 B, described first performance element 41 comprises: query unit 411, computing unit 412.
Described query unit 411, be used for modulating-coding pattern according to the spendable subband of each user terminal, and the corresponding relation of the speed of default modulating-coding pattern and subband, inquiry obtains the speed that each user terminal is supported on spendable subband;
Described computing unit 412 will use the scheduling rank of the user terminal of described current sub to multiply each other with the speed that described this user terminal is supported on spendable subband, the user terminal of selection product numerical value maximum.
Referring to shown in Figure 5, described control unit 311 comprises: second performance element 51, second is provided with unit 52.
Described second performance element 51 is used for the state parameter according to the Business Stream of described user terminal, determines the priority of each Business Stream of this user terminal;
Described second is provided with unit 52, is used for being provided with according to the priority of each Business Stream of this user terminal the scheduling rank of this user terminal.
Referring to shown in Figure 3, this system also comprises: taxon 314.
Described taxon 314 is used for arriving user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue;
Referring to shown in Figure 6, then described transmitting element 313 comprises:
Referring to shown in Figure 7, a kind of base station provided by the invention comprises: scheduling unit 71, transmitting element 72
Scheduling unit 71 is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback;
Transmitting element 72 is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. method that realizes scheduling downlink resource, be applied to it is characterized in that in the ofdm system, the subcarrier of each time slot in the described ofdm system is divided into a subband more than, each subband comprises a subcarrier more than, and this method may further comprise the steps:
A, described base station determine the scheduling rank of this user terminal according to the state parameter of the Business Stream of user terminal;
B, described base station are this user terminal allocated subbands according to scheduling rank and this user terminal of described user terminal to the channel information of base station feedback;
C, described base station arrive bag by described subband to the upper strata that this user terminal sends this user terminal.
2. method according to claim 1 is characterized in that, the channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal;
Then step B comprises:
B1, described base station as the current sub number, judge in the channel information of an above user terminal feedback whether comprise this subband number with subband number to be allocated, if having, then select a user terminal from a described above user terminal;
This user terminal is distributed to described current sub in B2, described base station.
3. method according to claim 2 is characterized in that, selects the step of a user terminal to comprise among the step B1 from a described above user terminal:
B11, described base station be according to the modulating-coding pattern of the spendable subband of each user terminal, and the corresponding relation of default modulating-coding pattern and the speed of subband, inquires about obtaining the speed that each user terminal is supported on spendable subband;
B12, described base station will use the scheduling rank of user terminal of described current sub and the speed that described this user terminal is supported on spendable subband to multiply each other, and select the user terminal of product numerical value maximum.
4. method according to claim 1 is characterized in that steps A comprises:
A1, described base station determine the priority of each Business Stream of this user terminal according to the state parameter of the Business Stream of described user terminal;
A2, described base station are provided with the scheduling rank of this user terminal according to the priority of each Business Stream of this user terminal.
5. method according to claim 4, it is characterized in that, in described base station, fifo queue is set respectively for the more than one Business Stream of each user terminal, wherein, the corresponding user terminal identification of each user terminal, the corresponding a kind of class of business sign of each Business Stream and QoS parameter, before steps A, this method also comprises:
A0, described base station arrive user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue;
Then step C comprises:
C1, described base station be according to the priority orders of each Business Stream of this user terminal, the upper strata in the fifo queue of each Business Stream correspondence of described user terminal arrived packing be downloaded on the subband that distributes into this user terminal;
C2, described base station send the upper strata that is loaded on the described subband to described user terminal and arrive bag.
6. method according to claim 1 is characterized in that, described state parameter comprises: the normalization time delay of the satisfaction factor, normalized packet loss and traffic stream queues head bag.
7. system that realizes scheduling downlink resource, be applied to it is characterized in that in the ofdm system that the subcarrier of each time slot is divided into a subband more than in the described ofdm system, each subband comprises a subcarrier more than, and this system comprises:
The base station is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback; Arrive bag by described subband to the upper strata that this user terminal sends this user terminal;
User terminal is used for to the base station feedback channel information.
8. system according to claim 7 is characterized in that, described base station comprises:
Control unit is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal;
Allocation units, scheduling rank and this user terminal of being used for according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback;
Transmitting element is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
9. system according to claim 7 is characterized in that, the channel information of described user terminal feedback comprises: the spendable subband number of this user terminal, and the modulating-coding pattern of spendable each subband of this user terminal,
Then described allocation units comprise,
First performance element is used for subband number to be allocated as the current sub number, judges in the channel information of an above user terminal feedback whether comprise this subband number, if having, then selects a user terminal from a described above user terminal;
First is provided with the unit, is used for described current sub is distributed to this user terminal.
10. system according to claim 9 is characterized in that, described first performance element comprises:
Query unit is used for the modulating-coding pattern according to the spendable subband of each user terminal, and the corresponding relation of the speed of default modulating-coding pattern and subband, and inquiry obtains the speed that each user terminal is supported on spendable subband;
Computing unit will use the scheduling rank of the user terminal of described current sub to multiply each other with the speed that described this user terminal is supported on spendable subband, the user terminal of selection product numerical value maximum.
11. system according to claim 7 is characterized in that, described control unit comprises:
Second performance element is used for the state parameter according to the Business Stream of described user terminal, determines the priority of each Business Stream of this user terminal;
Second is provided with the unit, is used for being provided with according to the priority of each Business Stream of this user terminal the scheduling rank of this user terminal.
12. system according to claim 11, it is characterized in that, in described base station, fifo queue is set respectively for the more than one Business Stream of each user terminal, wherein, the corresponding user terminal identification of each user terminal, the corresponding a kind of class of business sign of each Business Stream and QoS parameter, this system also comprises:
Taxon is used for arriving user terminal identification, class of business sign and the QoS requirement that bag carries according to the upper strata, described upper strata is arrived bag be kept in the corresponding fifo queue;
Then described transmitting element comprises:
Load units is used for the priority orders according to each Business Stream of this user terminal, the upper strata in the fifo queue of each Business Stream correspondence of described user terminal is arrived packing be downloaded on the subband that distributes into this user terminal;
Then described transmitting element sends the upper strata that is loaded on the described subband to described user terminal and arrives bag.
13. system according to claim 7 is characterized in that, described state parameter comprises: the normalization time delay of the satisfaction factor, normalized packet loss and traffic stream queues head bag.
14. a base station is characterized in that, is applied in the ofdm system, it is characterized in that, the subcarrier of each time slot in the described ofdm system is divided into a subband more than, and each subband comprises a subcarrier more than, and this base station comprises:
Scheduling unit is used for the state parameter according to the Business Stream of user terminal, determines the scheduling rank of this user terminal; Scheduling rank and this user terminal according to described user terminal are this user terminal allocated subbands to the channel information of base station feedback;
Transmitting element is used for arriving bag by described subband to the upper strata that this user terminal sends this user terminal.
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| CN101990271A (en) * | 2009-08-05 | 2011-03-23 | 北京大学 | Communication method between base state and terminal, wireless communication base station and system |
| WO2012031495A1 (en) * | 2010-09-10 | 2012-03-15 | 中兴通讯股份有限公司 | Long term evolution (lte) downlink control channel resource allocation method and base station |
| CN101883401B (en) * | 2009-05-07 | 2013-01-09 | 电信科学技术研究院 | Resource scheduling method and device of feedback information |
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| CN101990271A (en) * | 2009-08-05 | 2011-03-23 | 北京大学 | Communication method between base state and terminal, wireless communication base station and system |
| WO2012031495A1 (en) * | 2010-09-10 | 2012-03-15 | 中兴通讯股份有限公司 | Long term evolution (lte) downlink control channel resource allocation method and base station |
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| CN106559874B (en) * | 2015-09-24 | 2020-12-15 | 华为技术有限公司 | Subband scheduling method and device |
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