CN104469957A - LTE system base station device downlink resource distribution method and device - Google Patents
LTE system base station device downlink resource distribution method and device Download PDFInfo
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Abstract
The invention discloses an LTE system base station device downlink resource distribution method and device. The LTE system base station device downlink resource distribution method includes the steps that based on a wideband channel quality indicator (CQI), downlink resources are primarily and secondarily distributed, and the downlink resources are distributed based on a sub-band CQI. Configuration of various system parameters in an LTE system is fully considered, the parameters include channel quality information of users, service features, the service data buffer data size and the user control information buffer data size, the resources are distributed to the system access users, the requirements for QoS of different services of the system access users can be effectively guaranteed, and meanwhile system spectrum efficiency is improved.
Description
Technical field
The present invention relates to the base station design correlative technology field in mobile communication system, be specifically related to a kind of LTE system base station equipment descending resource allocation method and device.
Background technology
LTE (Long Term Evolution, Long Term Evolution) project is the evolution of G mobile communication, it improves and enhances the aerial access technology of 3G, physical layer adopts OFDM (Orthogonal FrequencyDivision Multiplexing) and MIMO (Multiple-Input Multiple-Output) technology, can provide the peak rate of descending 150Mbit/s and up 75Mbit/s under 20MHz spectral bandwidth.Meanwhile, further improve the performance of Cell Edge User, improve cell capacity and reduce system delay.
In LTE system, downlink resource distributes by the realization of base station equipment employing centralized control, each base station is multiple user service simultaneously, determine that each user sends data and uses how many resources, which Resource Block of concrete use, and send data acquisition which Downlink Control Information (DCI Downlink Control Information) parameter, as DCI format, schedule code mode etc.But how regulation does not carry out user's downlink resource allocation process in 3GPP LTE protocol standard, namely at transmission time interval for which user distributes running time-frequency resource, for user distributes how many resources, and reasonably downlink resource distributes is the key element affecting system of broadband wireless communication capacity, covering and quality of service.
Due to the complexity of customer location dynamic change and channel circumstance in wireless communication system, the channel quality of user also can dynamic change.The user with different channels quality information has different pieces of information disposal ability, and therefore in LTE, base station is carried out Resourse Distribute and needed to determine in conjunction with the channel quality indication (CQI) information (CQI ChannelQuality Indicator) of user.
In base station, the data of user's different business correspond to different radio bearer (RB, Radio Bearer), and carrying QoS (the Quality Of Service) parameter that different radio bearers is corresponding different, such as, each carrying has the service priority that a QCI (QoS Class Identifier) parameter is corresponding different.In LTE, radio bearer is divided into the radio bearer of guarantee bit rate GBR (Guranteed Bit Rate) and the radio bearer of non-guaranteed bit rate Non-GBR (Non-Guranteed Bit Rate).For GBR carrying, there is minimum guarantee bit rate GBR (Guaranteed Bit Rate) parameter, namely require that corresponding bit rate also can keep when Internet resources anxiety.Meanwhile, MBR (Maximum Bit Rate) parameter defines under GBR is carried on the condition of resource abundance, the rate-limit that can reach.The value of MBR is likely more than or equal to the value of GBR.And Non-GBR carrying does not ensure the restriction of bit rate parameter, namely when network congestion, business (or carrying) needs the requirement of bearing changing down, has total maximum rate restriction AMBR (Aggregate Maximum Bit Rate) for Non-GBR all in user.In LTE, the qos parameter of radio bearer is transmitted by S1 interface, is configured when radio bearer foundation, amendment.In order to ensure the qos parameter of above-mentioned LTE, be carry out when user resources are distributed, needing the qos parameter in conjunction with LTE carrying to require to determine the transmission size of data on different bearer counterlogic channel in base station.
In addition, it is different that the logic channel buffering area that user's different bearer is corresponding sends data volume.Meanwhile, different user needs the MAC layer control information of transmission also different.Therefore, base station down Resourse Distribute needs to consider system bandwidth, the descending CQI information of user feedback, user configuration information, user logic channel QoS configuration parameter, user logic channel buffer size, user's MAC layer control information buffer size many factors, determine the Physical Resource Block (PRB that user uses, Physical Resource Block), and the data volume that each user's Different Logic channel sends, and user sends the control information parameter that data use.
CN200410048327.2 discloses a kind of downstream grouped data scheduling method being applicable to mobile communication system, according to the link-quality of customer service, described method determines that the strategy that scheduler module adopts fixed priority and relative priority to combine carries out descending scheduling.The classification that fixed priority presses access service is arranged, and just selects the class of time high priority when not having grouped data to send in the class that priority is senior.Relative priority is for the maximum data queue's transmission of prioritizing selection relative priority weight parameter during of a sort traffic scheduling, and its priority argument is the function of queue link-quality, queue length, queue wait time delay.CN200510109284.9 discloses a kind of method of user being carried out to uplink scheduling and up-downgoing combined dispatching, specifically according to user scheduling information in upstream or downstream link (channel quality instruction, type of service, traffic carrying capacity, user's transmission rate and stand-by period) for user calculates the priority parameters of being dispatched by upstream or downstream, then according to up-downgoing scheduling priority class parameter up-downgoing combined dispatching is carried out to user.CN200810190583.3 discloses a kind of descending resource allocation method be applied in multi-carrier time division duplex system.First the user position in the cell of resource to be allocated is obtained by network controller RNC, then judge currently in system whether to exist and this user is in the user of the same area by RNC, if present, then by the metrical information of the metrical information of the reporting of user existed in community as resource user to be allocated, and Resourse Distribute can be carried out according to described measurement to user.This this programme can obtain metrical information more accurately and be conducive to distributing interference little resource to user, improves the quality of service of user.CN200810216675.4 discloses a kind of LTE FDD system descending scheduling and resource allocation methods, provides a kind of according to field feedback, carries out the method for new biography and data retransmission scheduling.Sorting (dispatching algorithm is poll, max carrier to interference or equitable proportion method) according to the fairness factor of dispatching algorithm when dispatching biography new biography and re-transmission user, successively user being dispatched.CN201010280601.4 discloses descending resource allocation method and device in a kind of LTE system.Concrete grammar is: base station divides the priority orders between user, and base station according to the number of resource blocks of priority orders needed for each user's dispensed of sequence, and is user's distributing radio resource according to described number of resource blocks; Wherein for user resource allocation block number is the minimum value that user ensures the Resource Block that minimum-rate needs and the number of resource blocks that buffer data needs, this invents described method can ensure that the minimum transmission rate of all UE in community improves the validity of local resource utilization.The open downlink dispatching method of CN201110458448.4 and device.Its method is the user first determining local resource block can be scheduled, then meets the PRB quantity of minimum-rate needs according to user and channel quality indication (CQI) information determines scheduled user on each Resource Block.The method considers channel quality and the minimum-rate needs of user, can improve the transmission rate of user to a certain extent, obtains the effect of larger spectrum efficiency.CN201210291412.6 discloses a kind of descending resource allocation method and device, specifically treating of precomputing is dispatched in Resource Block group to be allocated the maximum frequency of metric in dispatched users and selects the scheduling metrics value at family and the maximum non-frequency of scheduling metrics value to select family to compare; The scheduling metrics value that non-frequency selects family if frequency selects the scheduling metrics value at family to be more than or equal to, then select family frequently by current Resource Block component dispensing to be allocated; Otherwise, the non-frequency of current Resource Block component dispensing to be allocated is selected family.Its scheduling metrics is the spectrum efficiency of user in Resource Block group and the product of qos parameter.
Summary of the invention
For the problems referred to above, the invention provides one and effectively can ensure system access user different business qos requirement, improve LTE system base station equipment descending resource allocation method and the device of system spectral efficiency simultaneously.
For achieving the above object, LTE system base station equipment descending resource allocation method of the present invention, carries out one-level, secondary pre-allocation of resources based on broadband CQI respectively to downlink resource, distributes based on subband CQI to downlink resource.
For achieving the above object, LTE system base station equipment downlink resource distributor of the present invention, is characterized in that: comprise parameter configuration memory, downlink user scheduling trigger, descending scheduling processor, wherein:
Described parameter configuration memory distributes relevant configuration information parameter for storing downlink resource, comprises community configured information, user configuration information, user logic channel configuration information, user's down channel quality indication information, user logic channel buffer information, user MAC control information buffer information, descending scheduling trigger message, descending scheduling Output rusults information;
Described descending scheduling trigger is used for decision-making current system and whether starts descending scheduling process, and triggers descending scheduling processor and carry out downlink resource distribution;
Described descending scheduling processor is for performing descending scheduling and resource allocation process.
The present invention proposes the method and apparatus that a kind of LTE system base station equipment downlink resource distributes, in conjunction with real system service requirement, take into full account the channel quality information of the different user that LTE system base station side accesses, the QoS feature of business, business datum buffer area data volume, and the characteristic such as subscriber control information buffer area data volume, first the preassignment of resource coarseness is carried out according to consumer wideband CQI feedback information, then the adjustment of resource fine granularity is carried out according to user's subband CQI feedback information, priority scheduling process is taken turns by two, realize LTE system base station equipment downlink resource assigning process.System actual measurement display, the method and apparatus of the LTE system base station equipment downlink resource distribution of the present invention's design, when multiple access, can meet LTE system 1ms scheduling requirement, and ensure different user qos requirement, effective elevator system spectrum efficiency.
Accompanying drawing explanation
Fig. 1 is that the present invention plants LTE system base station equipment downlink resource assigned unit signal circulation figure;
Fig. 2 is the method step flow chart that the present invention plants the distribution of LTE system base station equipment downlink resource.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
A kind of LTE system base station equipment downlink resource distributor
LTE system base station equipment downlink resource distributor comprises parameter configuration memory, downlink user scheduling trigger, descending scheduling processor, wherein:
Described parameter configuration memory distributes relevant configuration information parameter for storing downlink resource, comprises community configured information, user configuration information, user logic channel configuration information, user's down channel quality indication information, user logic channel buffer information, user MAC control information buffer information, descending scheduling trigger message, descending scheduling Output rusults information;
Described descending scheduling trigger is used for decision-making current system and whether starts descending scheduling process, and triggers descending scheduling processor and carry out downlink resource distribution;
Described descending scheduling processor is for performing descending scheduling and resource allocation process.
Other cell configuration parameters relevant to Resourse Distribute such as the OFDM symbol number that described community configured information comprises system bandwidth, antenna port number, system sending mode (TDD or FDD), PDCCH (Physical Downlink Control Channel) take;
Described user configuration information comprises the Radio Network Temporary Identifier of user and RNTI (Radio NetworkTemporary Identifier) value, user's sending mode, user's uplink/downlink total maximum rate AMBR (Aggregated Maximum Bit Rate), user capability, user's transmitting antenna are selected, maximum HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat-request) transmission times and other and Resourse Distribute associated user configuration parameter;
Described user logic channel configuration information comprises Radio Network Temporary Identifier and the RNTI value, effectively logic channel configurable number and each logic channel concrete configuration of user; Wherein logic channel concrete configuration comprises logical channel number, LCGN, logic channel direction, logic channel QoS bearer types (GBR or Non-GBR), logic channel QCI value, logic channel uplink/downlink guaranteed rate GBR, logic channel uplink/downlink maximum rate MBR;
Described user's down channel quality indication information comprises System Frame Number corresponding to user feedback down channel quality instruction and system subframe number, user RNTI value, order indicates, the broadband CQI value of CQI type, transmission block, subband CQI value (the subband CQI that aperiodicity CQI user selects or the subband CQI that high level is selected, or the subband CQI of periodicity CQI UE measurement);
Described user logic channel buffer information comprises user RNTI value, logical channel number, logic channel transmit queue size, logical channel queue time delay;
Described user MAC control information buffer information comprises user RNTI value, user MAC control information element size;
Described descending scheduling trigger message comprises the scheduling HARQ processes state (new biography or re-transmission) of the RNTI value treated dispatching downlink number of users and treat dispatched users, the HARQ process number dispatching use, scheduled transmission block size, each transmission block;
Described descending scheduling Output rusults information comprises dispatched users number and each user scheduling object information; Wherein user scheduling object information comprises user RNTI value, user's Downlink Control Information (DCI), user CE sends size, each logic channel of user sends size of data; Wherein user's Downlink Control Information comprises CCE instruction, DCI format, resource allocation type, transmission block size, modulation coding mode instruction (0-31), other descending transmission related control information parameter such as NDI instruction (0 or 1), HARQ process number, redundancy versions etc.
A kind of LTE system base station equipment descending resource allocation method concrete steps comprise (as mistake! Do not find Reference source.Shown in):
S101, downlink user scheduling trigger obtains community configured information from parameter configuration memory, judges whether present sub-frame is downlink data transmission frame, if present sub-frame is downlink data transmission frame, performs step S102; Otherwise, terminate the downlink resource allocation process of present sub-frame;
S102, downlink user scheduling trigger obtains current system descending scheduling trigger message from parameter configuration memory, if treat, dispatching downlink number of users is greater than 0, performs step S103, otherwise terminates the downlink resource allocation process of present sub-frame;
S103, downlink user scheduling trigger initialization treats that dispatched users always sends that size of data is 0, to take PRB number be 0, initialization residue PRB number N
prbfor the descending PRB number of current TTI system spare;
S104, downlink user scheduling trigger generates downlink resource and distributes priority query, and downlink resource is distributed priority query and all user's descending scheduling trigger messages to be scheduled send to descending scheduling processor;
S105, descending scheduling processor perform the first downlink resource preassignment based on broadband CQI;
S106, descending scheduling processor perform the residue downlink resource preassignment based on broadband CQI;
S107, descending scheduling processor perform the concrete Resourse Distribute based on subband CQI;
S108, descending scheduling processor judge whether to remain PRB in addition, if having, perform step S109; Otherwise proceed to step S110;
If S109 has the user not carrying out Resourse Distribute, residue PRB is distributed to the user not carrying out Resourse Distribute, proceeds to step S110; Otherwise directly proceed to step S110;
Descending scheduling Output rusults information is sent to parameter configuration memory and carries out schedule information storage by S110, descending scheduling processor, and resource allocation process terminates.
Above-mentioned 0 judges that present sub-frame be whether the method for downlink data transmission frame is as follows:
If current system is configured to fdd mode, then present sub-frame is downlink data transmission frame.If current system is configured to tdd mode, then judging whether present sub-frame is downlink frame in conjunction with present frame configuration parameter, if present sub-frame is downlink frame, is downlink data transmission frame.
Above-mentioned 0 downlink user scheduling trigger is according to user's data type to be sent, user priority information, generate downlink resource and distribute priority query Q, priority scheduling queue Q comprises user MAC CE data, user's data retransmission and user's Different Logic channel new biography data three class user data message node to be sent, the precedence of three class Nodes Orderings is followed successively by, the CE information nodes of user 1-N, the retransmission information node of user 1-N, user logic channel information node.Wherein, the CE information nodes of different user, the retransmission information node of different user all sort according to the User Priority factor P of Proportional Fair dispatching algorithm; Priority order sequence from high to low corresponding to the QCI parameter of the user logic channel information node logically corresponding radio bearer of channel, for having the different user of same priority value according to Proportional Fair priority factors P order sequence from high to low; Priority factors P account form is defined as:
The Mean Speed formula (1) of the momentary rate/user of P=user on single PRB
Above-mentioned 0 descending scheduling processor comprises based on the first downlink resource preassignment concrete steps of broadband CQI:
If S201 priority scheduling queue Q is not empty, then from priority scheduling queue Q, takes out head of the queue node Q_node1 and delete from queue, if Q_node1 belongs to user k, performing step S202; If priority scheduling queue is empty, then terminate the first downlink resource pre-allocation process based on broadband CQI;
S202, determine Q_node1 respective user data type, determine size of data L1 to be sent, and the Physical Resource Block taken (PRB) number N 1;
If S203 Q_node1 respective user data L1 to be sent is greater than 0, judge whether there is user k information nodes in distributing user priority query Q2, if User Priority queue Q2 does not have user k corresponding informance node, then generate user's k information nodes and insert priority query Q2; Otherwise directly by user k corresponding informance node city priority query Q2; If Q_node1 respective user data L1 to be sent equals 0, then go to step S201;
S204, renewal user k always send size of data L (k)=L (k)+L1, and user k takies PRB number N (k)=N (k)+N1, system descending residue PRB number N
prb=N
prb-N1.If residue PRB number N
prbbe greater than 0 and go to step S201, otherwise, terminate the downlink resource pre-allocation process based on broadband CQI.
Above-mentioned 0 descending scheduling processor comprises the following steps based on the residue downlink resource preassignment of broadband CQI:
If S301 User Priority queue Q is not empty, then take out from priority query Q and delete head of the queue node Q1_node1, if node Q1_node1 is respective user k, user data transmission type is obtained according to user profile, new biography or re-transmission, if user is new biography user, perform next step, otherwise, perform step S309; If User Priority queue Q is empty, then terminate the residue downlink resource pre-allocation process based on broadband CQI;
S302, judge user k whether exist MAC CE informational needs send, if user needs to send CE information, judge in current pre-allocation information, whether user k CE transmission size is greater than 0, if be greater than 0, illustrate in first pre-allocation of resources to be user k transmission CE data allocations resource, go to step S305; Otherwise, if equal 0, then perform next step; If user k does not need to send CE information, then go to step S305;
S303, determine that user k CE sends size L2, and need the PRB number N2 that takies;
S304, send size of data CE (k)=L2 according to user k CE, upgrade user k and send size of data L (k)=L (k)+L2, PRB sum N (k) that user k takies=N (k)+N2, descending residue PRB number N
prb=N
prb-N2; If N
prbequal 0, then terminate the residue downlink resource pre-allocation process based on broadband CQI;
S305, determine that the user k logic channel i that increases newly sends size of data L2, and need the PRB number N2 that takies;
S306, transmission size of data value C (k, i)=C (k, i)+L2 that user k logic channel i distributed is set; User k is set and sends size of data L (k)=L (k)+L2; PRB sum N (k)=N (k)+N2 that user k takies is set; Descending residue PRB number N is set
prb=N
prb-N2;
If S307 remains PRB number N
prbbe greater than 0, then i=i+1 is set, if i is less than largest logical channel number MAX_LCH_NUM, then go to step S306, otherwise i is more than or equal to MAX_LCH_NUM and then goes to step S311; Otherwise, if residue PRB number equals 0, then terminate the residue downlink resource pre-allocation process based on broadband CQI;
S308, to judge in current pre-allocation information that user k retransmits and send size and whether be greater than 0, if be greater than 0, go to step S301, otherwise, perform next step;
S309, determine that user k retransmits and send size L2, and need the PRB number N2 that takies;
S310, user k is set sends size of data L (k)=L (k)+L2; PRB sum N (k)=N (k)+N2 that user k takies is set; Descending residue PRB number N is set
prb=N
prb-N2;
If the transmission size of data L2 that S311 user k distributes is greater than 0, judge whether there is user k information nodes in User Priority queue Q2, if user k does not insert User Priority queue Q2, form user profile node and insert priority query Q2; If residue PRB number is greater than 0, go to step S301, otherwise, if residue PRB number equals 0, then terminate the residue downlink resource pre-allocation process based on broadband CQI.
Above-mentioned 0 descending scheduling processor specifically comprises the following steps based on the Resourse Distribute of subband CQI:
S401, N is set
prbfor the descending PRB number of system current residual;
If priority query Q2 is not empty, takes out from the priority query Q2 that pre-allocation of resources produces and delete head of the queue node Q2_node1, if its respective user k, performing next step; Otherwise, terminate the resource allocation process based on subband CQI;
S402, in conjunction with PRB number N (k) required for the sub-band CQI information of user k and the user k that calculated, be the individual PRB:B of N (k) that user selects CQI value maximum
k, 1, B
k.2..., B
k, N (k)if wherein the minimum M in_CQI of CQI is greater than the broadband CQI value of user, then perform next step, otherwise go to step S405;
S403, according to CQI value Min_CQI again for user selects modulation coding mode, and based on the new modulation coding mode value selected, redefine user and send PRB N (k) required for size of data L (k), and the individual PRB:B of N (k) selecting CQI value maximum for user k
k, 1, B
k.2..., B
k, N (k);
S404, arranging user k, to send N number of PRB selected by data be B
k, 1, B
k.2..., B
k, N (k), descending residue PRB N is set
prb=N
prb-N, generates user k and sends the corresponding Downlink Control Information of data;
If S405 remains PRB N
prbbe 0, then ending resource assigning process; Otherwise, go to step S402.
Above-mentioned 0, determine that Q_node1 respective user logic channel or user CE or user's data retransmission allow to send size of data L1, and the method for the Physical Resource Block taken (PRB) number N 1 is:
If the type of S501 Q_node1 is logical channel information node, perform next step; If the type of Q_node1 is CE information nodes, turn 0; If the type of Q_node1 is user's retransmission information node, turn 0;
S502, establish the logic channel lc_id of Q_node1 respective user k, corresponding GBR or Non-GBR of decision logic channel lc_id, if corresponding GBR, performs next step; Otherwise, turn 0;
The corresponding GBR of S503, user k logic channel lc_id, the transmission size of data A1 of the instantaneous permission of user k logic channel lc_id is then calculated according to the minimum guaranteed rate of logic channel correspondence carrying, if logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1.Then user k logic channel lc_id permission transmission size of data L1 is the minimum value in A1, B1, P1; Send size of data L1 and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, can determine that user k sends the PRB number N1 of size of data L1 needs; (concrete grammar is for searching 3GPP 36.213 agreement Table 7.1.7.2.1-1, in conjunction with before for user k select modulation coding mode corresponding transfer of data block size instruction, transmission data bit is found to be greater than L1, and during closest to L1, in requisition for Physical Resource Block number be user send size of data L1 need PRB number.)
The corresponding Non-GBR of S504, user k logic channel lc_id, the corresponding minimum transmission rate R of service feature of logic channel correspondence carrying is then obtained according to the QCI value of the corresponding Non-GBR of lc_id, the transmission size of data A1 of the instantaneous permission of user k logic channel lc_id is calculated according to R, if logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, then Q_node1 respective user k logic channel lc_id transmission size of data L1 is the minimum value in A1, B1, P1.Send size of data and the modulation coding mode for user's selection according to logic channel, search 3GPP 36.213 agreement Table7.1.7.2.1-1, can determine that user sends the PRB number N1 of size of data L1 needs;
S505, user is set to need the CE size of data sent as L1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1.If P1 is greater than L1, then user k allows to send the CE data that size is L1, send size of data and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, can determine that user sends the PRB number of size of data L1 needs; Otherwise if P1 is less than B1, user k does not send CE information, do not need for user increases PRB;
S506, set user k to retransmit corresponding process number as H, it is L1 that the user k process H last time sends size of data, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1.If P1 is more than or equal to L1, then user k retransmits the process H data that size is L1, send size of data and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, can determine that user sends the PRB number of size of data L1 needs; Otherwise if P1 is less than L1, user k does not send retransmission information, the PRB number distributed for user k is 0.
Above-mentioned 0 obtains the corresponding minimum transmission rate of the corresponding service feature carried of logic channel according to the QCI value of the corresponding Non-GBR of logic channel can be arranged according to the corresponding service feature of QCI grade in 3GPP agreement TS 23.203, Table 6.1.7QCI mark sheet.
Above-mentioned 0 determines that user k CE sends size L2, and needs the method for the PRB number N2 taken identical with 0.
Above-mentioned 0 determines that the user k logic channel i increased newly sends size of data L2, and needs the method for the PRB number N2 taken as follows:
S601, judge corresponding GBR or Non-GBR of user k logic channel i, if corresponding GBR, perform next step; Otherwise, turn 0;
The corresponding GBR of S602, user k logic channel i, then calculate the transmission size of data A2 of the instantaneous permission of user k according to the maximum guaranteed rate of logic channel correspondence carrying, if logic channel buffering area size of data to be sent is B1, and residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, and it is A1 that the user k logic channel i that first downlink resource preassignment is determined sends size of data.The transmission size of data L2 that then user k logic channel i is newly-increased is the minimum value in A2-A1, B1, P1; Send size of data L2 and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, can determine that user k sends the PRB number N2 of size of data L2 needs;
The corresponding Non-GBR of S603, user k logic channel i, the maximum transmission size of data D1 of the instantaneous permission of user k Non-GBR is then calculated according to the AMBR rate value of user, being located at the user kNon-GBR transmission size of data of having distributed in preassignment is D2, if it is A2 that user k Non-GBR carries the size of data that also can send, then A2=D1-D2, if logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, then user k logic channel i transmission size of data L2 is the minimum value in A2, B1, P1; Send size of data and the modulation coding mode for user's selection according to logic channel, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, can determine that user sends the PRB number N2 of size of data L2 needs.
Above-mentioned 0 determines that user k retransmits sends size L2, and needs the method for the PRB number N2 taken identical with 0.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection range that protection scope of the present invention should define with claim is as the criterion.
Claims (8)
1. a LTE system base station equipment descending resource allocation method, is characterized in that: carry out one-level, secondary pre-allocation of resources based on broadband CQI respectively to downlink resource, distribute based on subband CQI to downlink resource.
2. LTE system base station equipment descending resource allocation method according to claim 1, it is characterized in that: described method also comprises generation, stores the step of downlink resource distribution priority query Q, and the precedence that wherein said downlink resource distributes three category nodes in priority query Q is followed successively by: the CE information node of user, the retransmission information node of user, user logic channel information node;
The CE information node of different user, the retransmission information node of different user are all according to the User Priority factor P order sequence from high to low of Proportional Fair dispatching algorithm, and priority factors P account form is as follows: the Mean Speed of the momentary rate/user of P=user on single physical resource PRB.
3. LTE system base station equipment descending resource allocation method according to claim 1, is characterized in that: described carry out one-level pre-allocation of resources to downlink resource and comprise the steps:
Whether S301 judges that downlink resource distributes priority query Q is empty,
If described priority query Q is not empty, then from priority scheduling queue Q, takes out head of the queue node Q_node1 and delete from queue, if Q_node1 belongs to user k, performing S302;
If priority scheduling queue is empty, then ending resource assigning process;
S302 determines user k data type, determines size of data L1 to be sent, and the Physical Resource Block PRB number N 1 taken; If S303 user k data L1 to be sent is greater than 0, then judge whether there is user k information nodes in distributing user priority query Q2,
If distributing user priority query Q2 does not have user k corresponding informance node, then generate user k information nodes and insert and distributed priority query Q2;
If distributing user priority query Q2 has user k corresponding informance node, then distribute priority query Q2 by user k corresponding informance node city;
If Q_node1 respective user data L1 to be sent equals 0, then turn S301;
S304 upgrades user k and always sends size of data L (k)=L (k)+L1, and user k takies PRB number N (k)=N (k)+N1, system descending residue physical resource PRB number N
prb=N
prb-N1;
Judge residue physical resource PRB number N
prbwhether be greater than 0,
If be greater than, then turn S301;
If equal, then terminate physical resource pre-allocation process.
4. LTE system base station equipment descending resource allocation method according to claim 1, is characterized in that: described carry out secondary pre-allocation of resources to downlink resource and comprise the steps:
Whether S401 judges that downlink resource distributes priority query Q is empty,
If described priority query Q is not empty, then takes out from priority query Q and delete head of the queue node Q1_node1, node Q1_node1 respective user k; User data transmission type is judged according to user profile,
If user is new biography user, then performing step S402, if user is for retransmitting user, then performing S309;
If User Priority queue Q is empty, then ending resource pre-allocation process;
S402 judges whether user k exists MAC CE informational needs and send,
If user needs to send CE information, then judge that in current pre-allocation information, whether user k CE transmission size is greater than 0, if be greater than 0, then goes to step S405; If equal 0, then perform S403;
If user k does not need to send CE information, then turn S405;
S403 determines that user k needs the size L2 of the CE information sent, and the PRB number N2 that needs take;
S404 upgrades user k and sends size of data L (k)=L (k)+L2, PRB sum N (k) that user k takies=N (k)+N2, descending residue PRB number N
prb=N
prb-N2; If residue physical resource PRBN
prbequal 0, then ending resource assigning process;
S405 determines that the user k logic channel i increased newly sends size of data L2, and the PRB number N2 that needs take;
S406 arranges the transmission size of data value C (k that user k logic channel i has distributed, i)=C (k, i)+L2, user k is set sends size of data L (k)=L (k)+L2, physical resource PRB sum N (k)=N (k)+N2 that user k takies is set, descending residue PRB number N is set
prb=N
prb-N2;
S407 has judged whether residue physical resource PRB number N
prbwhether be greater than 0,
If residue PRB number N
prbbe greater than 0, then i=i+1 is set, if i is less than largest logical channel number MAX_LCH_NUM, then go to step S406; If i is more than or equal to MAX_LCH_NUM, turn S411;
If residue PRB number N
prbequal 0, then ending resource pre-allocation process;
S408 judges that in current pre-allocation information, whether user k re-transmission transmission size is greater than 0, if be greater than 0, goes to step S401; If equal 0, then perform S409;
S409 determines that user k retransmits and sends size L2, and the physical resource PRB number N2 that needs take;
S410 arranges user k and sends size of data L (k)=L (k)+L2; PRB sum N (k)=N (k)+N2 that user k takies is set; Descending residue PRB number N is set
prb=N
prb-N2;
If the transmission size of data L2 that S411 user k distributes is greater than 0, judge whether there is user k information nodes in distributing user priority query Q2, if user k does not insert User Priority queue Q2, then form user profile node and insert priority query Q2; If residue PRB number is greater than 0, turn S401, otherwise, if residue PRB number equals 0, then end line pre-allocation of resources process.
5. LTE system base station equipment descending resource allocation method according to claim 1, is characterized in that: described carry out distribution based on subband CQI to downlink resource and comprise the steps:
S501 arranges the residue physical resource N after preassignment
prbfor the descending PRB number of system current residual;
If distributed priority query Q2 not for empty, take out from distributing priority query Q2 and deleted head of the queue node Q2_node1, its respective user k, having performed step S502;
If distributed priority query Q2 for empty, terminate the resource allocation process based on subband CQI;
S502, in conjunction with physical resource PRB number N (k) required for the sub-band CQI information of user k and the user k that calculated, is the individual PRB:B of N (k) that user selects CQI value maximum
k, 1, B
k.2..., B
k, N (k),, if wherein the minimum M in_CQI of CQI is greater than the broadband CQI value of user, then performs S504, otherwise turn S505;
S503 according to CQI value Min_CQI again for user selects modulation coding mode, and based on the new modulation coding mode value selected, redefine user and send PRB N (k) required for size of data L (k), and the individual PRB:B of N (k) selecting CQI value maximum for user k
k, 1, B
k.2..., B
k, N (k);
It is B that S504 arranges the N number of PRB of user k transmission selected by data
k, 1, B
k.2..., B
k, N (k), descending residue PRB N is set
prb=N
prb-N, generates user k and sends the corresponding Downlink Control Information of data;
If S505 remains PRB N
prbbe 0, then ending resource pre-allocation process; Otherwise, go to step S502.
6. LTE system base station equipment descending resource allocation method according to claim 3, is characterized in that: described S302 specifically comprises the steps:
If the type of S601 Q_node1 is logical channel information node, perform S602;
If the type of Q_node1 is CE information nodes, turn S605;
If the type of Q_node1 is user's retransmission information node, turn S606;
Corresponding GBR or Non-GBR of the logic channel lc_id of S602Q_node1 respective user k, decision logic channel lc_id,
If corresponding GBR, performs S603;
If corresponding Non-GBR, then perform 604;
S603 calculates the transmission size of data A1 of the instantaneous permission of user k logic channel lc_id according to the minimum guaranteed rate of logic channel correspondence carrying;
Logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, then user k logic channel lc_id permission transmission size of data L1 is the minimum value in A1, B1, P1;
Send size of data L1 and the modulation coding mode for user's selection according to user, search 3GPP36.213 agreement Table 7.1.7.2.1-1, determine that user k sends the PRB number N1 of size of data L1 needs;
S604 obtains the corresponding minimum transmission rate R of service feature of logic channel correspondence carrying according to the QCI value of the corresponding Non-GBR of lc_id, the transmission size of data A1 of the instantaneous permission of user k logic channel lc_id is calculated according to R, logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, then Q_node1 respective user k logic channel lc_id transmission size of data L1 is the minimum value in A1, B1, P1; Send size of data and the modulation coding mode for user's selection according to logic channel, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, determine that user sends the PRB number N1 of size of data L1 needs;
S605 user needs the CE size of data sent to be L1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1; If P1 is greater than L1, then user k allows to send the CE data that size is L1, send size of data and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, determine that user sends the PRB number of size of data L1 needs; If P1 is less than B1, user k does not send CE information, does not need for user increases PRB;
It is H that S606 user k retransmits corresponding process number, and it is L1 that the user k process H last time sends size of data, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1; If P1 is more than or equal to L1, then user k retransmits the process H data that size is L1, send size of data and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, determine that user sends the PRB number of size of data L1 needs; If P1 is less than L1, user k does not send retransmission information, and the PRB number distributed for user k is 0.
7. LTE system base station equipment descending resource allocation method according to claim 4, is characterized in that: described S405 specifically comprises the steps
S701 judges corresponding GBR or Non-GBR of user k logic channel i, if corresponding GBR, performs S702; If corresponding Non-GBR, then perform S703;
S702 calculates the transmission size of data A2 of the instantaneous permission of user k according to the maximum guaranteed rate of logic channel correspondence carrying, and logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, and it is A1 that the user k logic channel i that one-level, the preassignment of secondary downlink resource are determined sends size of data; The transmission size of data L2 that user k logic channel i increases newly is the minimum value in A2-A1, B1, P1; Send size of data L2 and the modulation coding mode for user's selection according to user, search 3GPP 36.213 agreement Table 7.1.7.2.1-1, determine that user k sends the PRB number N2 of size of data L2 needs;
S703 calculates the maximum transmission size of data D1 of the instantaneous permission of user k Non-GBR according to the AMBR rate value of user, it is D2 that the user k Non-GBR distributed in preassignment sends size of data, it is A2 that user k Non-GBR carries the size of data that also can send, then A2=D1-D2, logic channel buffering area size of data to be sent is B1, residue PRB number N
prbthe maximum transmission size of data of user k allowed is P1, then user k logic channel i transmission size of data L2 is the minimum value in A2, B1, P1; Send size of data and the modulation coding mode for user's selection according to logic channel, search 3GPP 36.213 agreement Table7.1.7.2.1-1, determine that user sends the PRB number N2 of size of data L2 needs.
8. a LTE system base station equipment downlink resource distributor, is characterized in that: comprise parameter configuration memory, downlink user scheduling trigger, descending scheduling processor, wherein:
Described parameter configuration memory distributes relevant configuration information parameter for storing downlink resource, comprises community configured information, user configuration information, user logic channel configuration information, user's down channel quality indication information, user logic channel buffer information, user MAC control information buffer information, descending scheduling trigger message, descending scheduling Output rusults information;
Described descending scheduling trigger is used for decision-making current system and whether starts descending scheduling process, and triggers descending scheduling processor and carry out downlink resource distribution;
Described descending scheduling processor is for performing descending scheduling and resource allocation process.
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