CN102014432B - Downlink resource allocation method and base station - Google Patents
Downlink resource allocation method and base station Download PDFInfo
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Abstract
The invention discloses a downlink resource allocation method and a base station. The method comprises the following steps that: the base station can guarantee the number of bytes required by quality of service (QoS) rate of the current downlink, the number of bytes of upper frame retransmission compensation, the frame length of the current frame and the set current scheduling mode according to the current frame, and determines the number of bytes actually allocated to the current downlink in the current frame; and a protocol data unit (PDU) is combined according to the number of bytes actually allocated to the current downlink in the current frame, and the combined PDU is transmitted to a terminal. The invention improves the processing capacity and performance of a system.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of resource allocation methods and base station of downlink.
Background technology
Automatic repeat request (Automatic ReQuest for retransmission, referred to as ARQ) mechanism is Institute of Electrical and Electric Engineers (Institute for Electrical andElectronic Engineers, referred to as IEEE) 802.16 agreements introduce a kind of medium education (Medium Access Control, referred to as MAC) layer automatic retransmission mechanism, effectively improve the transmission performance of MAC layer, improve the robustness of MAC layer medium surface transmission.ARQ mechanism asks transmit leg to retransmit the data message of makeing mistakes by the feedback of recipient, recovers the message of makeing mistakes, thus ensures the transmission quality of MAC layer.Wherein, the feedback of recipient has two kinds, and one is positive acknowledgement (Acknowledge, referred to as ACK), and one is Negative Acknowledgement (Negative Acknowledge, referred to as NACK).Receive positive acknowledgement to continue to send data below, receive Negative Acknowledgement retransmission data.ARQ ensures that transmission quality consumes MAC bandwidth for cost with its re-transmission message, and channel condition is poorer, and ARQ retransmits the message that message does not receive with regard to needing the more extra bandwidth duplicate removal of consumption to send out terminal.
802.16 protocol definitions, five kinds of scheduling types initiatively ensure band width service (UnsolicitedGrant Service, referred to as UGS), real-time polling service (Real-time PollingService, referred to as rtPS), the real-time polling service (Extended rtPS) of expansion, non-real-time polling service (Non-real-time Polling Service, referred to as nrtPS) and Best-Effort service (Best Effort, referred to as BE).Wherein, UGS, rtPS, ErtSP major design supports the real time business such as E1/T1 transmission and IP network voice-bearer agreement (Voice Over IP, referred to as VOIP).Real time business is very responsive to time delay, and often not high to the requirement of packet loss, and such as, one or two bag is lost in speech business, substantially can not affect speech quality.And nrtPS and BE two kinds of business major design are supported the insensitive business of time delay, such as, file transfer protocol (FTP) (File Transfer Protocol, referred to as FTP) business, HTML (Hypertext Markup Language) (HyperText Transport Protocol, referred to as HTTP) business and mail service etc., the transmission of these two kinds of business is all the non-real-time service carried with TCP usually, very responsive to packet loss, the words finding that there is packet loss as TCP will be initiated to retransmit, much larger than the re-transmission cost of MAC of the re-transmission of TCP.So enable ARQ mechanism in nrtPS business and BE business, the re-transmission reducing upper strata is a reasonable selection.
Simultaneously, the major applications layer service that BE and nrtPS carries out (such as, FTP, HTTP and mail service) to be that filled band is wide carry out, so, when eated dishes without rice or wine packet loss time, just there will be retransmitted packet and newly give out a contract for a project and rob the phenomenon of service quality (Quality of Service, referred to as QoS) bandwidth.The impact of this phenomenon on the business that Transmission Control Protocol carries to cause link congestion, thus cause application layer traffic to decline.
Summary of the invention
Main purpose of the present invention is the Resource Allocation Formula providing a kind of downlink, due to retransmitted packet with newly give out a contract for a project and rob QoS bandwidth and cause the problem that link congestion, application layer traffic decline when eating dishes without rice or wine packet loss at least to solve in above-mentioned correlation technique.
To achieve these goals, according to an aspect of the present invention, a kind of resource allocation methods of downlink is provided.
According to the resource allocation methods of downlink of the present invention, comprise the following steps: according to present frame, base station can ensure that the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of present frame and the current scheduling mode of setting compensated, determine that current downlink links the byte number of actual allocated in the current frame; And link the byte number combination protocol Data Unit PDU of actual allocated in the current frame according to current downlink, and the PDU after combination is sent to terminal.
Further, determine that the byte number that current downlink links actual allocated in the current frame comprises: according to present frame, base station can ensure that byte number needed for the QoS speed that current downlink links and upper frame retransmit the byte number compensated, obtain present frame and preallocated byte number is linked to current downlink, wherein, upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting current downlink; Base station links preallocated byte number, the frame length of present frame and the current scheduling mode of setting according to present frame to current downlink, determines that current downlink links the byte number of actual allocated in the current frame.
Further, the byte number combination PDU linking actual allocated in the current frame according to current downlink comprises: base station obtains according to the byte number that current downlink links actual allocated in the current frame Service Data Unit SDU that needs retransmit and/or is combined as PDU from the new SDU obtaining newly transmission queue that sends out from retransmission queue.
Further, the SDU being divided into multiple logical block from IP layer is stored in a new queue; The continuous print block of the continuous print block storing re-transmission timer time-out in retransmission queue or the negative feedback receiving self terminal.
Further, the byte number needing the SDU retransmitted to take is less than or equal to the m of the byte number of the new SDU sent doubly, and wherein, m is greater than 0.
Further, present frame links preallocated byte number to current downlink and is less than or equal to n times that present frame can ensure the byte number needed for the QoS speed that current downlink links, and wherein, n is greater than 1.
Further, before determining that current downlink links the byte number of actual allocated in the current frame, the method also comprises: base station calculates the frame length of present frame according to the current information of eating dishes without rice or wine obtained, wherein, current information of eating dishes without rice or wine at least comprises one of following: byte number, MIMO type under modulation coding mode, symbol ratio, slot number, each slot.
To achieve these goals, according to a further aspect in the invention, a kind of base station is additionally provided.
According to base station of the present invention, comprise: determination module, for ensureing that according to present frame the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of present frame and the current scheduling mode of setting compensated, determine that current downlink links the byte number of actual allocated in the current frame; And package module, for linking the byte number combination protocol Data Unit PDU of actual allocated in the current frame according to current downlink; And sending module, send to terminal for the PDU after being combined by package module.
Further, determination module comprises: obtain preassignment byte number unit, for ensureing that according to present frame byte number needed for the QoS speed that current downlink links and upper frame retransmit the byte number compensated, obtain present frame and preallocated byte number is linked to current downlink, wherein, upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting current downlink; Determining actual allocated byte number unit, for linking preallocated byte number, the frame length of present frame and the current scheduling mode of setting according to present frame to current downlink, determining that current downlink links the byte number of actual allocated in the current frame.
Further, the byte number of package module also for linking actual allocated in the current frame according to current downlink obtains from retransmission queue needs the Service Data Unit SDU of repeating transmission and/or is combined as PDU from the new SDU obtaining new transmission that sends out queue.
Pass through the present invention, the byte number adopting current downlink to be linked at present frame actual allocated comprises the mode that frame retransmits the byte number compensated, to solve in correlation technique when eating dishes without rice or wine packet loss due to retransmitted packet and newly give out a contract for a project and rob QoS bandwidth and cause the problem that link congestion, application layer traffic decline, improve disposal ability and the performance of system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the resource allocation methods of downlink according to the embodiment of the present invention;
Fig. 2 is the structured flowchart of the base station according to the embodiment of the present invention;
Fig. 3 is the structured flowchart of base station according to the preferred embodiment of the invention;
Fig. 4 is the cooperation schematic diagram of ARQ state machine according to the preferred embodiment of the present invention two and scheduler;
Fig. 5 is to the new schematic diagram sending out the maintenance of queue and retransmission queue according to the ARQ state machine of the preferred embodiment of the present invention three;
Fig. 6 is to the process schematic diagram of the SDU in different queue according to the scheduler of the preferred embodiment of the present invention four.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
According to the present embodiment, provide a kind of resource allocation methods of downlink.Fig. 1 is the flow chart of the resource allocation methods of downlink according to the embodiment of the present invention, as shown in Figure 1, comprises the following steps:
Step S102, according to present frame, base station can ensure that the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of present frame and the current scheduling mode of setting compensated, determine that current downlink links the byte number of actual allocated in the current frame; And
Step S104, links byte number combination protocol Data Unit (Protocol Data Unit, referred to as PDU) of actual allocated in the current frame, and the PDU after combination is sent to terminal according to current downlink.
Pass through above-mentioned steps, the byte number adopting current downlink to be linked at present frame actual allocated comprises the mode that frame retransmits the byte number compensated, to solve in correlation technique when eating dishes without rice or wine packet loss due to retransmitted packet and newly give out a contract for a project and rob QoS bandwidth and cause the problem that link congestion, application layer traffic decline, improve disposal ability and the performance of system.
Preferably, determine that the byte number that current downlink links actual allocated in the current frame comprises: according to present frame, base station can ensure that byte number needed for the QoS speed that current downlink links and upper frame retransmit the byte number compensated, obtain present frame and preallocated byte number is linked to current downlink, wherein, upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting current downlink; Base station links preallocated byte number, the frame length of present frame and the current scheduling mode of setting according to present frame to current downlink, determines that current downlink links the byte number of actual allocated in the current frame.The method has made compensation to the bandwidth of downlink effectively, improves the utilance of resource.
Such as, in specific implementation process, can get present frame to current downlink link preallocated byte number for present frame can ensure byte number needed for the QoS speed that current downlink links and upper frame retransmit the byte number compensated and.
Preferably, the byte number combination PDU linking actual allocated in the current frame according to current downlink comprises: the byte number that base station links actual allocated in the current frame according to current downlink obtains the Service Data Unit (Service Data Unit, referred to as SDU) of needs repeating transmission and/or is combined as PDU from the new SDU obtaining new transmission that sends out queue from retransmission queue.The method uses retransmission queue to manage needing the SDU retransmitted, and uses a new queue to manage the new SDU (that is, the SDU do not sent) sent, improves order and the stability of system.
In specific implementation process, when existing for the remainder bytes of current downlink link distribution in the current frame, preferably can obtain from retransmission queue and need the SDU retransmitted carry out group PDU.If after needing the SDU retransmitted in taking-up retransmission queue, in present frame, also exist for the vacant byte that current downlink link distributes, the new SDU sent can be obtained from new sending out queue, then carry out group PDU.
Preferably, the SDU being divided into multiple logical block from IP layer is stored in a new queue; The continuous print block of the continuous print block storing re-transmission timer time-out in retransmission queue or the negative feedback receiving self terminal.IP bag is divided into the SDU of multiple logical block by the method, also can transmit piecemeal local, improve the accuracy of system when making to retransmit.
Preferably, the byte number needing the SDU retransmitted to take is less than or equal to the m of the byte number of the new SDU sent doubly, and wherein, m is greater than 0.The method limits the byte number needing the SDU retransmitted to take, and improves practicality and the validity of system.
Preferably, present frame links preallocated byte number to current downlink and is less than or equal to n times that present frame can ensure the byte number needed for the QoS speed that current downlink links, and wherein, n is greater than 1.Use the method that present frame can be set and preallocated byte number is linked to current downlink, improve the stability of system.
Preferably, before step S102, base station can calculate the frame length of present frame according to the current information of eating dishes without rice or wine obtained, wherein, current information of eating dishes without rice or wine at least comprises one of following: modulation coding mode, symbol than, the byte number of slot number, each slot, have more (Multiple-Input Multiple-Out-put, referred to as MIMO) type more.The method realizes simple, workable.
Corresponding to said method, the embodiment of the present invention additionally provides a kind of base station.Fig. 2 is the structured flowchart of the base station according to the embodiment of the present invention, as shown in Figure 2, this base station 20 comprises: determination module 22, for ensureing that according to present frame the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of present frame and the current scheduling mode of setting compensated, determine that current downlink links the byte number of actual allocated in the current frame; And package module 24, be coupled to determination module 22, for linking the byte number combination protocol Data Unit PDU of actual allocated in the current frame according to current downlink; And sending module 26, be coupled to package module 24, send to terminal for the PDU after being combined by package module 24.
By above-mentioned base station, the byte number adopting current downlink to be linked at present frame actual allocated comprises the mode that frame retransmits the byte number compensated, to solve in correlation technique when eating dishes without rice or wine packet loss due to retransmitted packet and newly give out a contract for a project and rob QoS bandwidth and cause the problem that link congestion, application layer traffic decline, improve disposal ability and the performance of system.
Fig. 3 is the structured flowchart of base station according to the preferred embodiment of the invention, as shown in Figure 3, determination module 22 comprises: obtain preassignment byte number unit 222, for ensureing that according to present frame byte number needed for the QoS speed that current downlink links and upper frame retransmit the byte number compensated, obtain present frame and preallocated byte number is linked to current downlink, wherein, upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting current downlink; Determine actual allocated byte number unit 224, be coupled to and obtain preassignment byte number unit 222, for linking preallocated byte number, the frame length of present frame and the current scheduling mode of setting according to present frame to current downlink, determine that current downlink links the byte number of actual allocated in the current frame.
Preferably, the byte number of package module 24 also for linking actual allocated in the current frame according to current downlink obtains from retransmission queue needs the Service Data Unit SDU of repeating transmission and/or is combined as PDU from the new SDU obtaining new transmission that sends out queue.
Be described in detail below in conjunction with the implementation procedure of preferred embodiments and drawings to above-described embodiment.
Preferred embodiment one
Embodiments provide a kind of method of the descending re-transmission bandwidth compensation based on the enable connection of ARQ, can solve and cause ARQ mechanism better can not ensure the problem of the QoS transmission quality of the above message of MAC layer when there being re-transmission message because retransmission rate counts QoS bandwidth estimation.
In specific implementation process, base station side can safeguard ARQ state machine and scheduler two thread entities, and its job step can comprise following content respectively:
(1) for each ARQ state machine, new sending out and re-transmission two queues can be safeguarded:
1.1 when receiving the SDU from IP layer at every turn, this SDU is just logically divided into multiple pieces (block) by base station ARQ state machine, the length of every block is determined by parameter ARQ_BLOCK_SIZE, records the block sequence number that each block is corresponding, and inserts queue tail of the queue of newly giving out a contract for a project.
1.2 schedulers can call SDU away from queue team head of newly giving out a contract for a project.Now, ARQ state machine can arrange re-transmission and the lifetime timer of all pieces of this SDU.
1.3 in time receiving the feedback of self terminal, can process in two kinds of situation: (1) when be negative feedback (namely, NACK) time, if the block be fed is in a new queue, ARQ state machine will be denied the sequence number continuous print block of feedback in same SDU, form a new SDU burst, move into retransmission queue tail of the queue; (2) in time being asserts feedback (that is, ACK), ARQ state machine can be deleted this block from state machine.
When the re-transmission timer time-out of 1.4 pieces, ARQ state machine, by queue re-transmission timer time-out and block sequence number continuous print block simultaneously of newly giving out a contract for a project, forms a new SDU burst, is moved into retransmission queue tail of the queue.
1.5 schedulers can call the burst of SDU away from team's head of retransmission packet queue.Now, ARQ state machine restarts re-transmission timer.
1.6 when receiving the asserts feedback of terminal, and the block be fed is deleted by ARQ state machine from state machine.
(2) for scheduler, the bag in these two queues can be responsible for recall group PDU:
2.1 each frame, scheduler according to coded system and symbol ratio etc., can calculate current frame length.
2.2 current connections can calculate this frame QoS bandwidth need take byte number, and takies byte number addition with the previous frame re-transmission message of record, and this links the byte number taken in advance to obtain present frame.
2.3, according to scheduling mode and above result, obtain the byte number of this frame actual allocated of current connection.It should be noted that, scheduling mode here can be configured according to practical application.
2.4 each frame, scheduler priority checks whether retransmission queue has bag, if without bag, skips this step.If there is bag, dispatch out the data being not more than and distributing byte number, group PDU, record current scheduling retransmits byte number, is left to when next frame distributes bandwidth and uses.
If the byte number that 2.5 present frames distribute is retransmitted message and takies completely, terminate this time scheduling; Otherwise, check whether queue of newly giving out a contract for a project has message.Send out queue if new and have message, take out from a new queue data being not more than and distributing byte number, group PDU.Record current new byte number, terminate this frame scheduling.
Visible, when the variation along with the condition of eating dishes without rice or wine, when retransmission packet can increase gradually, such scheme there will be following problem: the expense that (1) current connection retransmits the bandwidth, CPU etc. that message is correlated with is excessive; (2) for this connection is assigned with a large amount of bandwidth resources, thus the bandwidth resources that account for other and connect are robbed.
To the amount of bandwidth of the distribution retransmitted for SDU, following restricted version is done to these needs:
Start during scheme one: ARQ connection establishment one second level timer, and constant m is set.The cumulative byte number of current new and the byte number of current repeating transmission respectively.If the byte number of current repeating transmission is greater than new m times of sending out byte number, indicates that this SDU is not retransmitted, this bag can not be put into retransmission queue.
Scheme two: scheduler arranges a constant n, obtains current modulation coding mode.If modulating-coding compression ratio is lower, then get n=n/2.If the present frame calculated this link the byte number that takies in advance and be greater than n this frame QoS bandwidth doubly and need take byte number, get present frame this to link the byte number taken in advance be that n this frame QoS bandwidth doubly need take byte number.
Scheme three: ARQ mechanism utilizes ARQ parameter to make restriction to number of retransmissions.Such as, the life cycle of restriction ARQ block (block), the Purge Timeout of ARQ block.
The embodiment of the present invention ensure that the bandwidth cost of the re-transmission message of ARQ mechanism, QoS performance when ensure that ARQ mechanism is enable more than MAC layer, promote the performance of ARQ mechanism under degraded channel condition, reducing of simultaneously trying one's best retransmits message bandwidth compensation to the impact of other users.
Preferred embodiment two
Fig. 4 is the cooperation schematic diagram of ARQ state machine according to the preferred embodiment of the present invention two and scheduler, and as shown in Figure 4, in base station, the collaboration process of ARQ state machine and scheduler is as follows:
Step S402, MAC layer obtains SDU by upper strata message.
Step S404, ARQ state machine can logically be divided into block (block) SDU.
Blocks all for SDU is put into a new queue by step S406, ARQ state machine.
Step S408, if scheduler finds currently to be connected with vacant byte, preferentially will take out the SDU of re-transmit queue.
Step S410, this connection of scheduler records retransmits byte number.
Step S412, scheduler sees whether current connection also has vacant byte, if enter step S414, otherwise enters step S416.
Step S414, scheduler from queue of newly giving out a contract for a project, schedules message.
Step S416, scheduler by PDU group well, sends.
The function of step S418, scheduler readjustment ARQ state machine, restarts re-transmission timer.
Step S420, if retransmission time out or receive the negative feedback of terminal, then takes out SDU from queue of newly giving out a contract for a project.
Step S422, puts into retransmission queue using the SDU burst needing to retransmit as a new SDU.Scheduler takes out SDU from retransmission queue, sends.
Preferred embodiment three
Fig. 5 is that as shown in Figure 5, in base station, the maintenance process of ARQ state machine to Xin Fa and retransmission queue is as follows according to the ARQ state machine of the preferred embodiment of the present invention three to the new schematic diagram sending out the maintenance of queue and retransmission queue:
Step S502, receive upper strata IP at every turn and wrap, MAC layer is packaged into SDU.
Step S504, enters ARQ state machine.Such as, start at ARQ state machine, can start one second level timer, timer expired, newly to give out a contract for a project and the byte statistical number of retransmission packet is set to 0, restarts statistics.
This SDU of step S506, ARQ state machine is logically divided into block (block), and the length of every block is determined by parameter ARQ_BLOCK_SIZE, records the block sequence number that each block is corresponding.
This SDU is inserted into a new queue tail of the queue by step S508, ARQ state machine.
Step S510, ARQ state machine adds up the byte number of newly giving out a contract for a project.
Step S512, the message that scheduler recalls from queue.
Step S514, judges whether it is newly give out a contract for a project.If newly give out a contract for a project, enter step S516, otherwise enter step S518.
Step S516, starts raw cycle timer.
Step S518, reset re-transmission timer.
Step S520, re-transmission timer time-out or receive the negative feedback of terminal, ARQ state machine then adds up re-transmission byte number.
Step S522, judges whether the life cycle time-out of block.If there is the life cycle time-out of block, enter step S524; If life cycle does not have time-out, then enter step S526.
Step S524, ARQ state machine abandons the re-transmission to this block, sends discard message to terminal.
Step S526, if retransmit byte number to be greater than new m times of sending out byte number, then abandons retransmitting; Otherwise, from a new queue, taking out the SDU of condition below meeting---all pieces of this SDU all have received feedback or the re-transmission timer time-out of terminal.
Step S528, by negative feedback or the continuous print block of re-transmission timer time-out, be put into, in retransmission queue as a SDU burst.The message of retransmission queue recalls by scheduler.
Preferred embodiment four
Fig. 6 is that as shown in Figure 6, in base station, the flow process of the message of scheduler handle different queue is as follows according to the scheduler of the preferred embodiment of the present invention four to the process schematic diagram of the SDU in different queue:
Step S602, obtains current information of eating dishes without rice or wine.Such as, modulation coding mode, symbol ratio, slot number etc.
Step S604, arranges a constant n.If the modulation coding mode of current connection is lower, the re-transmission of this link is compensated limits value n and changes little n=n/2.
Step S606, according to the information of eating dishes without rice or wine that step S602 obtains, calculates current frame length.
Step S608, calculates the QoS speed of the current connection meeting AAA configuration, the byte number required for present frame.
Step S610, in judgement, frame retransmits n times that whether byte number is greater than present frame distribution byte number.
Step S612, if upper frame retransmits byte number be greater than n times that present frame distributes byte number, is then taken as frame and retransmits the n of byte number byte number needed for current QoS bandwidth that message compensates doubly; If the byte number that last time retransmits is less than or equal to n times that present frame is the byte number of guaranteed qos allocated bandwidth, then compensate for upper frame retransmits the byte number that byte number is all re-transmissions of upper frame.
Step S614, get the preallocated byte number of present frame needed for guaranteed qos byte number and for upper frame retransmit the byte number compensated and.
Step S616, to look current connection actual allocated byte number according to scheduling mode, preassignment byte number and present frame.
Step S618, judges whether have bag in retransmission queue.If retransmission queue has bag, then enter step S620; Otherwise, enter step S626.
Step S620, calls the bag of retransmission queue.
Step S622, minute book frame retransmits byte number.
Step S624, group PDU, mails to and eats dishes without rice or wine.
Step S626, if present frame also promising connect the remainder bytes of distributing, then call the new bag sending out queue.Otherwise, terminate this time scheduling of current connection.
Step S628, will newly send out the message of queue, group PDU, terminates this time scheduling of current connection.
In sum, due to the Main Bottleneck that the restriction of QoS bandwidth to re-transmission message flow is ARQ mechanism transmission quality, so, the scheme of the bandwidth compensation based on the enable downlink of ARQ that the embodiment of the present invention provides has made compensation to the bandwidth that ARQ data retransmission takies, can ensureing like this when there being available bandwidth of air-interface, obtaining and retransmitting effect preferably.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a resource allocation methods for downlink, is characterized in that, comprises the following steps:
According to present frame, base station can ensure that the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of described present frame and the current scheduling mode of setting compensated, determine that described current downlink is linked at the byte number of actual allocated in described present frame; And
Be linked at the byte number combination protocol Data Unit PDU of actual allocated in described present frame according to described current downlink, and the described PDU after combination is sent to terminal.
2. method according to claim 1, is characterized in that, determines that the byte number that described current downlink is linked at actual allocated in described present frame comprises:
According to described present frame, described base station can ensure that byte number needed for the QoS speed that described current downlink links and upper frame retransmit the byte number compensated, obtain described present frame and preallocated byte number is linked to described current downlink, wherein, described upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting described current downlink;
Described base station links preallocated byte number, the frame length of described present frame and the current scheduling mode of setting according to described present frame to described current downlink, determines that described current downlink is linked at the byte number of actual allocated in described present frame.
3. method according to claim 1, is characterized in that, the byte number being linked at actual allocated in described present frame according to described current downlink combines described PDU and comprises:
The byte number that described base station is linked at actual allocated in described present frame according to described current downlink obtains the Service Data Unit SDU of needs repeating transmission and/or is combined as described PDU from the new SDU obtaining newly transmission queue that sends out from retransmission queue.
4. method according to claim 3, is characterized in that, stores the SDU being divided into multiple logical block from IP layer in described new queue; Store the continuous print block of re-transmission timer time-out in described retransmission queue or receive the continuous print block of the negative feedback from described terminal.
5. method according to claim 3, is characterized in that, the described byte number needing the SDU retransmitted to take is less than or equal to the m of the byte number of the SDU of described new transmission doubly, and wherein, m is greater than 0.
6. method according to claim 1, is characterized in that, described present frame links preallocated byte number to current downlink and is less than or equal to n times that described present frame can ensure the byte number needed for the QoS speed that described current downlink links, and wherein, n is greater than 1.
7. method according to any one of claim 1 to 6, is characterized in that, before determining that described current downlink is linked at the byte number of actual allocated in described present frame, also comprises:
Described base station calculates the frame length of described present frame according to the current information of eating dishes without rice or wine obtained, and wherein, described current information of eating dishes without rice or wine at least comprises one of following: byte number, MIMO type under modulation coding mode, symbol ratio, slot number, each slot.
8. a base station, is characterized in that, comprising:
Determination module, for ensureing that according to present frame the byte number needed for the service quality QoS speed that current downlink links, upper frame retransmit byte number, the frame length of described present frame and the current scheduling mode of setting compensated, determine that described current downlink is linked at the byte number of actual allocated in described present frame; And
Package module, for being linked at the byte number combination protocol Data Unit PDU of actual allocated in described present frame according to described current downlink; And
Sending module, for sending to terminal by the described PDU after described package module combination.
9. base station according to claim 8, is characterized in that, described determination module comprises:
Obtain preassignment byte number unit, for ensureing that according to described present frame byte number needed for the QoS speed that described current downlink links and upper frame retransmit the byte number compensated, obtain described present frame and preallocated byte number is linked to described current downlink, wherein, described upper frame retransmits the byte number that compensates and is linked at message in former frame for retransmitting described current downlink;
Determine actual allocated byte number unit, for linking preallocated byte number, the frame length of described present frame and the current scheduling mode of setting according to described present frame to described current downlink, determine that described current downlink is linked at the byte number of actual allocated in described present frame.
10. base station according to claim 8 or claim 9, it is characterized in that, the byte number of described package module also for being linked at actual allocated in described present frame according to described current downlink obtains from retransmission queue to be needed the Service Data Unit SDU of repeating transmission and/or is combined as described PDU from the new SDU obtaining new transmission that sends out queue.
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