CN104811290A - Subframe reconfiguration system and method based on LTE-Advanced system data amount to be transmitted - Google Patents
Subframe reconfiguration system and method based on LTE-Advanced system data amount to be transmitted Download PDFInfo
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Abstract
The invention discloses a subframe reconfiguration system and method based on LTE-Advanced system data amount to be transmitted. The system is based on an LTE-Advanced system, a relay node is further arranged in the LTE-Advanced system, the relay node adopts in-band relay, and a link between a base station and a user is divided into two portions, namely a return stroke link between the base station and the relay node and an access link between the relay node and users in a relay cell. Subframe configuration of the return stoke link is dynamically adjusted according to the comparison result of the return stroke link and the access link to fully utilize wireless resources. Compared with the prior art, the resources between the return stroke link and the access link can be balanced according to the data amount of the two links, the backward compatibility is fully considered in the return stroke link configuration process, the effect on the access link is reduced to the maximum degree, resources are fully utilized, and the throughput of the relay cell can be improved.
Description
Technical field
The present invention relates to LTE communication technical field, particularly relate to TDD lte-a system relay return link sub-frame configuration dynamic debugging system and method.
Background technology
LTE-Advanced (the being called for short LTE-A) system introduced in LTE R10 is as the smooth evolution of LTE system, compared with LTE R8, the principal character of increase comprises: the transmission of the descending multi-antenna transmission of carrier aggregation, enhancing, upstream multi-antenna, relaying and support that heterogeneous network is disposed.
Can terminal depend on very many-sided impact with network service and the data rate in communication process, and the path loss wherein between terminal and base station is exactly on the one hand.Single from link budget angle, the peak data rate that LTE supports requires higher signal to noise ratio, by improving the distance that network configuration reduces between base station to user, thus can improve link budget.
Summary of the invention
In order to overcome the problem of above-mentioned prior art, the present invention proposes a kind of subframe method for reconfiguration based on LTE-Advanced system data to be transferred amount, achieve the utilance in order to balancing resource and presence of intercell interference, the basis that sub-frame configuration is constant makes switch between its son configuration, the data to be transferred amount based on lte-a system relaying cell back haul link and access link carries out dynamic conditioning to sub-frame configuration.
The present invention proposes a kind of subframe reconfiguration system based on LTE-Advanced system data to be transferred amount, this system is based on LTE-Advanced system, also via node is provided with in described LTE-Advanced system, described via node adopts relaying in band, between base station and user one link is divided into two parts and is divided into two parts, that is: the access link in the back haul link between base station to via node and via node to relaying cell between user; Described back haul link and described access link share same frequency resources; Described back haul link comprises uplink and downlink backhaul subframe, and described access link comprises uplink and downlink access subframe; Described downlink subframes in return link is configured to MBSFN sub-frame; The descending comparative result treating defeated biography data volume of foundation back haul link and access link, dynamically adjusts the sub-frame configuration of back haul link, to make full use of Radio Resource
The invention allows for a kind of subframe method for reconfiguration based on LTE-Advanced system data to be transferred amount, the method comprises the following steps:
Step 1, carry out initial configuration, upper and lower backhaul subframe is set to the son configuration that downlink subframes in return link is many;
Step 2, issuing service, start transfer of data, obtains system time, and the mode that the employing time drives advances, and in units of a 10ms radio frames, each subframe is 1ms;
Step 3, in units of 10ms radio frames, judge the type of 10 subframes in back haul link and the every radio frames of access link, if be backhaul subframe, perform step 4; If be access subframe, perform step 5;
Step 4, calculate descending backhaul subframe data to be transmitted amount b2 and descending access subframe data to be transmitted amount a2 respectively;
Step 5, compare the size of a2 and b2;
If step 6 a
2>b
2, show that access link downlink data amount is more than back haul link downlink transmission data amount, then notify rrc layer, lower signaling, switches to the configuration that access link descending access subframe is many;
Step 7: otherwise, if a
2<b
2, show that access link downlink data amount is fewer than back haul link downlink transmission data amount, then notify rrc layer, lower signaling, switches to the configuration that the descending backhaul subframe of back haul link is many.
Compared with prior art, the present invention can fully according to the resource between how many balance back haul links of data volume in two links and access link, backwards compatibility has been taken into full account in the process of configuration back haul link, maximize the impact decreased access link, make full use of resource, improve relaying cell throughput.
Accompanying drawing explanation
Fig. 1 is lte-a system chain k-path partition schematic diagram of the present invention;
Fig. 2 is back haul link and access link sub-frame allocation schematic diagram;
Fig. 3 is that backhaul subframe configuration 3-0 transmits schematic diagram;
Fig. 4 is that backhaul subframe configuration 3-1 transmits schematic diagram;
Fig. 5 is that backhaul subframe configuration 3-2 transmits schematic diagram;
Fig. 6 is for carry out dynamic recognition flow chart based on descending data to be transferred amount to subframe;
Fig. 7 is descending data to be transmitted computational methods flow chart.
Embodiment
Below in conjunction with the drawings and the specific embodiments, be described in further detail technical scheme of the present invention.
As shown in Figure 1, for lte-a system add relaying after introduce new link after the division of whole system link, RN (Relay Node is introduced in lte-a system, via node) after, between original base station to user one link be divide into two parts, wherein eNodeB (the being called for short eNB) link between RN is called Backhaul Link (back haul link), link between RN to R-UE (UE in relaying cell is denoted as R-UE) is called Access Link (access link), link between eNodeB and Macro UE is called Direct Link (direct connected link).
According to the frequency spectrum that back haul link and access link use, relaying can be divided into relaying in the outer relaying of band and band, then say in band, back haul link and access link are operated in same frequency spectrum, due to the two shared same frequency spectrum, the transmitter of relaying will produce certain interference to receiver, namely said self-interference, so back haul link is impossible with access link in identical frequency resource simultaneously, unless this interference can be processed by suitable antenna arrangement, otherwise just need to separate back haul link and access link in time-domain, also just mean that the two just can not work simultaneously.When RN receives the data from eNodeB, just can not send data to UE, in like manner, when RN sends data to eNodeB, UE does not send any data to RN.In order to avoid UE carries out unnecessary reception work at this moment, by backhaul descending sub frame is configured to MBSFN sub-frame, make UE not carry out any operation in this stage, and RN receive data in the MBSFN sub-frame stage and complete the switching receiving transmission, as shown in Figure 2.
Owing to using relaying in band, back haul link and access link share identical Radio Resource, and be semiduplex mode of operation, relaying can not be received and sent messages simultaneously, therefore can have an impact to the process of the HARQ operation of back haul link and access link, because be the fundamental requirement developing LTE solution with R8 edition compatibility, so the HARQ operation of access link can not be changed, in access link, the data that PDSCH sends, corresponding ACK/NACK transmits at PUCCH, when but if corresponding PUCCH place subframe is used in backhaul link transmission, RN just cannot receive the feedback from R-UE in this subframe, therefore, the possibility receiving PUCCH at access link depends on that back haul link operates, more specifically, it is the sub-frame allocation depending on back haul link.So when distributing backhaul link subframe, the impact on access link be taken into full account, impact being dropped to minimum.
For neighbor cell, if sub-frame configuration difference can bring larger interference to neighbor cell, if configure identical, just cannot make full use of resource according to different demand, add relaying in the cell, make the interference between cell edge and neighbor cell larger.
For tdd mode, the corresponding relation comprising 10ms of the time relationship inherence of HARQ operation, this meets the structure of MBSFN 10ms, and in backhaul transport, likely keep the spacing of rule, in tdd mode, #0, #5 subframe is for launching synchronizing signal, and #1, #6 subframe is used for paging, #2, #3, #4, #7, #8, #9 is that is only had to be configured to backhaul subframe.In 7 kinds of configurations of subframe in tdd mode, #0 and the #5 subframe of configuration 0 is two unique descending sub frames, can not be configured to MBSFN sub-frame, therefore configures 0 and can not be used in relaying cell.And configure in 5 and only have a sub-frame of uplink, in order to support back haul link and access link simultaneously, at least need two sub-frame of uplink, therefore in these 7 kinds configurations, only have configuration 1,2,3,4,6 to support relaying cell, in each TDD configuration, support that one or more backhaul subframe configures.
The conflict of HARQ Timing relation to back haul link and access link sub-frame configuration that the present invention is based on R8 version adjusts, to configure 3, analysis has been made to three seed configurations of configuration 3, on the basis of original HARQ Timing, number for different service types and data to be transferred amount selects different backhaul to configure targetedly, to realize high data rate and high-throughput, make full use of Radio Resource, better coordinate the work of back haul link and repeated link.
For configuration 3, the configuration of backhaul subframe can be divided in different ascending-descending subframes ratio three kinds, is denoted as 3-0,3-1,3-2 respectively, in table 1.
Backhaul subframe proportion relation when table 1, sub-frame configuration 3
Backhaul subframe configuration 3-0, namely time back haul link uplink and downlink subframe proportioning 1:1 (back haul link sub-frame of uplink number: downlink subframes in return link number), subframe #3 and #9 is distributed into backhaul subframe, on subframe #3, RN cannot receive the confirmation from R-UE, if subframe #9 is mixed with MBSFN sub-frame, then R-UE does not now receive the data of RN, RN receives backhaul downlink data at subframe #9, and completes the conversion of Rx to Tx in this subframe.
In TDD LTE R8 version, the HARQ Timing relation of sub-frame configuration 3 is as shown in table 2.
Table 2, sub-frame configuration 3 up-downgoing HARQ Timing relation
First be the corresponding relation between UL grant and UL Data, subframe #0 sends UL grant, and corresponding UL Data sends at #4; Corresponding DL ACK/NACK transmits at the subframe #0 of next radio frames, and and so forth, the feedback of subframe #8 and #9 is transmitted at #2 and #3 respectively.Next is the corresponding relation between UL Data and DL ACK/NACK, and the UL ACK/NACK that the DL Data of subframe #8 is corresponding transmits on #2, and subframe #9 and #0 is respectively in subframe #3 and #4 transmission.Be finally DL transmission and its correspondence UL feedback between corresponding relation, the UL ACK/NACK that the DL Data on subframe #1, #5, #6 is corresponding transmits on #2, and subframe #3, #4 are in like manner.
So when #3 and #9 is used as backhaul subframe, on sub-frame of uplink #3, RN can not receive any message from R-UE, and #9 is as backhaul descending sub frame (although being MBSFN sub-frame), R-UE also can receive UL grant and the DL ACK/NACK (if ACK/NACK transmits at PDCCH) of PDCCH, but cannot receive the data of PDSCH transmission.
Different types of service has different demands, such as when user surfs the Net download, the transmission quantity of downlink data will much larger than up, if the resource of uplink-downlink configuration as much in this case, to be easy to cause that downlink resource is limited and ascending resource utilance is low, descending sub frame can be configured more for this business scenario, and by few for sub-frame of uplink configuration, thus improve resource utilization.The present invention is based on the above analysis to sub-frame configuration, find that difference is only some descending sub frame to give back haul link or access link for three seed configurations of configuration 3.By comparing the number of back haul link and the descending data to be transferred amount of access link, adjusting sub-frame configuration dynamically, making full use of Radio Resource.
As shown in Figure 2, back haul link is described and how access link subframe distributes.The subframe distributing to back haul link is called backhaul subframe, and that distributes to access link is called access subframe.Backhaul subframe and access subframe are divided into sub-frame of uplink and descending sub frame again respectively, for backhaul sub-frame of uplink, main realization is by the transfer of data of RN to eNB, because backhaul and access link share same frequency resources, therefore separate in time, so in the backhaul up stage, do not have any operation of access link, also namely RN now cannot receive the information of R-UE.Backhaul descending sub frame is configured to MBSFN sub-frame usually, does not carry out any reception operation at this stage R-UE, until RN receives and after completing and receive the conversion of transmission, RN starts to send information to R-UE.
As shown in Figure 3, for the change schematic diagram of HARQ operation timing relationship in son configuration 3-0, backhaul uplink and downlink subframe ratio 1:1, the uplink and downlink transmission of back haul link is completed by #3 and #9 respectively, according to the HARQTiming relation of R8 in access link, ascending HARQ and descending HARQ are specifically allocated as follows:
Ascending HARQ process: subframe #0 sends UL grant, and corresponding UL transmission sends at subframe #4, and corresponding DL ACK/NACK sends at the subframe #0 of next radio frames; Subframe #8 sends UL grant, and corresponding ULtransmission sends out #2 in subframe and sends, and corresponding DL ACK/NACK sends at subframe #8.For data retransmission, still observe HARQ Timing relation, if that is #8 have sent NACK, then R-UE transmits data again at next #2.
Uplink ACK/NACK that DL transmission on descending HARQ procedure: subframe #1, #5, #6 is corresponding sends at subframe #2, uplink ACK/NACK that DL transmission on subframe #7 and #8 is corresponding should send at subframe #3, but subframe #3 is backhaul subframe, corresponding HARQ Timing relation needs to change, then corresponding feedback is changed on subframe #4 and transmit.
As shown in Figure 4, for the change of subframe HARQ operation timing relationship in configuration 3-1, backhaul ascending-descending subframes ratio 1:2, subframe #3, #7, #9 are used as backhaul subframe, in back haul link, subframe #9 sends UL grant, and corresponding UL transmission sends at subframe #3, and corresponding DL ACK/NACK sends at subframe #9; Subframe #7 sends DL transmission, and corresponding UL ACK/NACK sends at subframe #3.In access link, ascending HARQ is identical with configuration 3-0, in descending HARQ, the ULACK/NACK that DL transmission on subframe #1, #5, #6 is corresponding transmits at subframe #2, and UL ACK/NACK corresponding to DL transmission on subframe #8 ought to transmit at subframe #3, but subframe #3 has been configured to backhaul subframe, therefore corresponding HARQ Timing relation will change, and changes to subframe #4 feedback.Can find out, unique difference of configuration 3-0 and 3-1 is that subframe #7 distributes to back haul link or access link.
As shown in Figure 5, for the change of HARQ operation timing relationship in son configuration 3-2, backhaul ascending-descending subframes ratio is 1:3, subframe #3, #7, #8, #9 are used as backhaul subframe, in back haul link, subframe #7 is identical with other two kinds configurations with the associated transport of #9, add subframe #8, if according to the HARQ Timing relation of R8, corresponding uplink should at subframe #2, but according to configuration, only have subframe #3 to be used as backhaul up, therefore corresponding HARQ Timing relation needs to change, and the transmission on subframe #2 changes to subframe #3.At access link, associated transport and other the two kinds configuration of subframe #0 is identical.Also have three descending sub frames #1, #5, #6, corresponding uplink feedback transmits at subframe #2.
As shown in Figure 6, for the subframe dynamic configuration policy flow chart based on data to be transferred amount, suppose all sub-frame configuration to be initialized as when global parameter initialization comparatively fair pattern (backhaul and the pattern of access number of subframes without larger difference), backhaul subframe is configured to configure 3-2, namely backhaul sub-frame of uplink is subframe #3 backhaul descending sub frame is subframe #7, #8, #9, then for access link, access sub-frame of uplink is subframe #2, #4, and access descending sub frame is subframe #0, #1, #5, #6.Carry out dynamic recognition flow process based on descending data to be transferred amount to subframe to comprise the following steps:
Step 601: carry out initial configuration to system parameters, is set to configure 3-2 by backhaul subframe configuration;
Step 602: carry out initialization to simulated conditions, comprises the simulation parameter such as type of service, amount of bandwidth;
Step 603: issuing service, starts transfer of data, obtains system time, and the mode that the employing time drives advances, and in units of a 10ms radio frames, each subframe is 1ms;
Step 604: the type judging 10 subframes in every radio frames in units of 10ms radio frames, judges that backhaul subframe still accesses subframe, if backhaul subframe, then performs step 606, and access subframe then performs 605;
Step 605: calculate the descending data to be transmitted amount a of access link;
Step 606: calculate the descending data to be transmitted amount b of back haul link;
Step 607: the size comparing a and b;
Step 608: if a<b, switches to the configuration that downlink subframes in return link is many, namely notifies high level, signaling under rrc layer, switches to configuration 3-2;
Step 609: if a>b, then illustrate that access link downlink data amount is more than backhaul link data amount, then should switch to the many configurations of access link descending sub frame, that is: notice is high-rise, signaling under rrc layer, switches to configuration 3-0;
Step 610: the uplink and downlink data volume of back haul link and access link is added up respectively;
Step 611: utilize statistics to calculate uplink and downlink throughput respectively.
Shown in Fig. 7, be the circular of the descending data to be transmitted amount of step 605, comprise following flow process:
Step 701: input parameter is available RB number N
rB, available RE number N
rE, the CQI value I that reports
cQI;
Step 702: by table look-up (Table 7.2.3-1:4-bit CQI Table), by I
cQI(Efficiency is that the row provided in agreement pass through the numerical value calculated, and has Efficiency=code check (code rate) * modulation system (Q to search corresponding parameter Efficiency
m)), be denoted as E, try to achieve the maximum available bits number meeting code check requirement: B
1=E*N
rE;
Step 703: compare B
1with the size of Z-L, wherein Z=6144bits (agreement setting, being less than this value is without code block segmentation), L are CRC size (shared by cyclic redundancy check value bit size); If B
1<=Z-L, performs step 704, otherwise performs step 705;
Step 704: the maximum TB size meeting code check requirement when not carried out code block segmentation is B=B
1-L;
Step 705: the maximum TB size meeting code check requirement after obtaining carrying out code block segmentation is B=B
1-(C+1) L; (C is the number of code block);
Step 706: table look-up Table 7.1.7.2.1-1, with available RB number N
rBdetermine the row of this table, find first bit number to be less than or equal to B
1row, now can determine I
tBSand the size of maximum TB, the bit number also namely transmitted in this TB;
Step 707: added up by all TB waiting for transmission, namely obtains the bit number to be transmitted of this down channel.
Claims (2)
1. the subframe reconfiguration system based on LTE-Advanced system data to be transferred amount, it is characterized in that, this system is based on LTE-Advanced system, also via node is provided with in described LTE-Advanced system, described via node adopts relaying in band, between base station and user one link is divided into two parts, that is: the access link in the back haul link between base station to via node and via node to relaying cell between user; Described back haul link and described access link share same frequency resources; Described back haul link comprises uplink and downlink backhaul subframe, and described access link comprises uplink and downlink access subframe; Described downlink subframes in return link is configured to MBSFN sub-frame; The descending comparative result treating defeated biography data volume of foundation back haul link and access link, dynamically adjusts the sub-frame configuration of back haul link, to make full use of Radio Resource.
2., based on a subframe method for reconfiguration for LTE-Advanced system data to be transferred amount, it is characterized in that, the method comprises the following steps:
Step (1), carry out initial configuration, upper and lower backhaul subframe is set to the son configuration that downlink subframes in return link is many;
Step (2), issuing service, start transfer of data, obtains system time, and the mode that the employing time drives advances, and in units of a 10ms radio frames, each subframe is 1ms;
Step (3), in units of 10ms radio frames, judge the type of 10 subframes in back haul link and the every radio frames of access link, if be backhaul subframe, perform step (4); If be access subframe, perform step (5);
Step (4), calculate descending backhaul subframe data to be transmitted amount b and descending access subframe data to be transmitted amount a respectively;
Step (5), compare the size of a and b;
Step (6), if a>b, shows that access link downlink data amount is more than back haul link downlink transfer row data volume, then notify rrc layer, lower signaling, switch to the configuration that access link descending access subframe is many;
Step (7) otherwise, if a<b, show that access link downlink data amount is fewer than back haul link downlink transmission data amount, then notify rrc layer, lower signaling, switches to the configuration that the descending backhaul subframe of back haul link is many.
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Application publication date: 20150729 |