CN101795494A - Method, device and system for data distribution in LET-A system - Google Patents
Method, device and system for data distribution in LET-A system Download PDFInfo
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- CN101795494A CN101795494A CN200910077919A CN200910077919A CN101795494A CN 101795494 A CN101795494 A CN 101795494A CN 200910077919 A CN200910077919 A CN 200910077919A CN 200910077919 A CN200910077919 A CN 200910077919A CN 101795494 A CN101795494 A CN 101795494A
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Abstract
The invention discloses a method for data distribution in a LTE-A system, which comprises that: an RLC layers of network nodes receive a plurality of RLC SDUs transmitted by PDCP layers, wherein the RLC SDUs comprise communication data of at least one communication opposite terminal; and the RLC layers distribute the plurality of received RLC SDUs to carriers according to preset scheduling policies and transmit plurality of distributed RLC SDUs to the communication opposite terminals through protocol layers below the layer. Thus, compared with the LTE system, the LTE-A system has the advantages of avoiding the change of the protocol design and equipment of the protocol layers below the RLC layers of the network nodes and consequently saving research and development cost to a great extent. In addition, the invention also discloses a communication device and the LTE-A system.
Description
Technical field
The present invention relates to the communications field, the intrasystem data distribution method of particularly a kind of LTE-A, Apparatus and system.
Background technology
Along with the development of technology, wireless communication system is to improving the demand sustainable growth of data rate.At third generation partner program (3rd Generation Partnership Project, 3GPP), in order to satisfy growing data-rate requirements, as Long Term Evolution (Long Term Evolution, LTE) the evolution version of system, Long Term Evolution-senior (Long Term Evolution-Advance LTE-A) system need support the bandwidth of maximum 100MHz.At present, at this target, the LTE-A system is under the prerequisite of considering rational UE complexity, adopt carrier aggregation technology to realize the bandwidth expansion, so-called carrier aggregation technology promptly is that a plurality of existing LTE carrier waves are carried out polymerization, thereby uses when realizing continuous frequency spectrum and discontinuous spectrum.In the LTE-A system, adopt carrier aggregation technology, can make data transmission simultaneously on a plurality of carrier waves, thereby before sending data, must carry out data distribution at same UE.
Under the prior art, the LTE-A Installed System Memory describes in detail below two kinds of data distribution modes.
Consult shown in Figure 1ly, first kind of data distribution mode is: (Physical Layer PHY) carries out data distribution in physical layer.
What is called is carried out data distribution at the PHY layer, be meant in transfer of data during to the MAC layer, the data that belong to same UE are constituted a transmission block (Transport Block based on all carrier waves, TB) (when adopting space multiplexing technique is two TB), then, when transfer of data during to the PHY layer, the data of same UE will be belonged to, Resource Block (the Resource Block that adopts identical modulation coding mode to map to distribute to this UE in each carrier wave, RB) on, wherein, a Resource Block comprises at least one subcarrier, generally, a Resource Block consists of a plurality of sub-carriers.
Consult shown in Figure 2ly, second kind of data distribution mode is: (MediaAccess Control MAC) carries out data distribution in medium access control system sublayer.
What is called is carried out data distribution at the MAC layer, be meant in transfer of data during to the MAC layer, the data that belong to same UE are constituted an independent transmission block on each carrier wave, then, when transfer of data during to the PHY layer, in each carrier wave, will belong to the data of same UE, adopt identical modulation coding mode to map on the Resource Block of distributing to this UE in this carrier wave.In addition, in each carrier wave, the data that belong to different UEs can adopt different modulation coding modes to carry out the resource mapping.
As depicted in figs. 1 and 2, under the prior art, in the LTE-A system, no matter adopt PHY layer data shunting mode, or MAC layer data shunting mode, all need (the Radio Link Control of control sub layer of wireless link in the LTE standard, RLC) Yi Xia design of protocol and equipment realize carrying out corresponding modify, for example, when adopting PHY layer data shunting mode, need the maximum of Resource Block be redefined; And when adopting MAC layer data shunting mode, need to revise the capacity of rlc layer metadata cache equipment.Obviously, these operations all can increase equipment development and cost of developing to a certain extent, thereby have brought certain inconvenience for the development in the future of LTE-A system.
Summary of the invention
The embodiment of the invention provides the intrasystem data distribution method of a kind of LTE-A, Apparatus and system, in order to reduce the R﹠D costs of LTE-A system.
The concrete technical scheme that the embodiment of the invention provides is as follows:
The intrasystem data distribution method of a kind of LTE-A comprises:
RLC layers of network nodes receives some RLC SDU that the PDCP layer issues, and comprises the communication data of at least one Correspondent Node among the described RLC SDU;
Described rlc layer is assigned on each carrier wave according to some RLC SDU that default scheduling strategy will receive, and the some RLC SDU after will distributing mail to described Correspondent Node by the following protocal layers of this layer.
The intrasystem communicator of a kind of LTE-A comprises:
The packet scheduling module, belong to rlc layer, be used to receive some RLC SDU that the PDCP layer issues, and some RLC SDU that will receive according to default scheduling strategy are assigned on each carrier wave, wherein, the communication data that comprises at least one Correspondent Node among the described RLC SDU;
The rlc layer functional module belongs to rlc layer, is used for the RLC SDU after distributing is mail to described Correspondent Node by the following protocal layers of this layer.
A kind of LTE-A system comprises a plurality of communicators, and wherein, described communicator comprises:
The packet scheduling module belongs to rlc layer, is used to receive some RLC SDU that the PDCP layer issues,
And some RLC SDU that will receive according to default scheduling strategy are assigned on each carrier wave, wherein, comprise the communication data of at least one Correspondent Node among the described RLC SDU;
The rlc layer functional module belongs to rlc layer, is used for the RLC SDU after distributing is mail to described Correspondent Node by the following protocal layers of this layer.
In the embodiment of the invention, in the LTE-A system, by set up a packet scheduling module in each RLC layers of network nodes, realize data distribution based on RLC, like this, with respect to the LTE system, just do not need the design of protocol and the equipment of the following protocal layers of rlc layer in each network node are realized changing, thereby can farthest reuse existing protocol design of LTE system and equipment and realize that this has saved the R﹠D costs of LTE-A system to a great extent.
Description of drawings
Fig. 1 is a PHY layer data shunting mode schematic diagram under the prior art;
Fig. 2 is a MAC layer data shunting mode schematic diagram under the prior art;
Fig. 3 is communication system architectural framework figure in the embodiment of the invention;
Fig. 4 is base station functions structure chart in the truth example of the present invention;
Fig. 5 is a rlc layer data distribution mode flow chart in the embodiment of the invention;
Fig. 6 is at the rlc layer data distribution schematic diagram of many UE in the embodiment of the invention;
Fig. 7 for UE in the truth example of the present invention to the downlink data that the receives schematic diagram that reorders.
Embodiment
In order to save the R﹠D costs of LTE-A system, in the embodiment of the invention, in the LTE-A system, the control sub layer of wireless link of network node (Radio Link Control, RLC) receiving block data convergence protocol sublayer (Packet Data Convergence Protocol, PDCP) some Radio Link control service data unit (the Radio Link Control:RLC Service Data Unit that issue, RLC SDU), the communication data that comprises at least one Correspondent Node among the described RLC SDU; Described rlc layer is assigned on each carrier wave according to some RLC SDU that default scheduling strategy will receive, and the some RLC SDU after will distributing mail to described Correspondent Node by the following protocal layers of this layer.
From foregoing description as can be seen, the inventive point of the embodiment of the invention comprises: carry out data distribution at rlc layer, promptly in data map that RLC layers of network nodes will belong to same Correspondent Node to each carrier wave on the corresponding resource blocks, in the present embodiment, be that user terminal (UE) is that example is introduced with Correspondent Node.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Figure 3, in the present embodiment, the LTE-A system comprises a plurality of network nodes and a plurality of user terminal, wherein, network node sends downlink data by intrasystem each carrier wave to each user terminal, and network node can be base station, base station controller or the like network side network element.
Consult shown in Figure 4, in the present embodiment, data link layer in the network node is accepted physical layer (PhysicalLayer, PHY) service, and provide service to network layer, data link layer comprise medium insert the sublayer (Media Access Control, MAC), control sub layer of wireless link (RLC) and packet data convergence protocol sublayer (PDCP), comprise functional module 1, packet scheduling module 10, functional module 2, scheduling of resource module 11 and functional module 3 in the network node, wherein:
Packet scheduling module 10, belong to rlc layer, be used to receive some RLCSDU that the PDCP layer issues, and some RLC SDU that will receive according to default scheduling strategy are assigned on each carrier wave, wherein, the communication data that comprises at least one Correspondent Node among the described RLC SDU;
Functional module 2 belongs to rlc layer, is used for the RLC SDU after distributing is mail to described Correspondent Node by the following protocal layers of this layer.
The concrete effect of other functional modules will be described in detail in following examples.
In the present embodiment, be that example is introduced, so, consult shown in Figure 5ly that the detailed process that network node is shunted the downlink data of UE 1 at local rlc layer is as follows with a user terminal (hereinafter referred to as UE 1):
When the downlink data of step 500:UE1 passed through the PDCP layer, the functional module 1 in the PDCP layer was carried out the compression and the encryption of IP packets headers to it, formed the some RLC SDU that arrive rlc layer.
Step 510: some RLC SDU that functional module 1 will form are sent to the packet scheduling module 10 in the rlc layer.
Step 520: packet scheduling module 10 is assigned on each carrier wave according to some RLC SDU that default scheduling strategy will receive, and the some RLC SDU that are about to receive are buffered in the interior corresponding formation of each carrier wave.
In the present embodiment, scheduling strategy that packet scheduling module 10 adopts is including but not limited to Random assignment strategy, poll allocation strategy and load balancing strategy or the like.
On the other hand, if there is the downlink data of a plurality of UE, so, in a carrier wave, the downlink data that all UE can be set is shared a formation, the downlink data that each UE also can be set has different queue, and the downlink data that the different business of each UE use can also be set has different queue, does not repeat them here.
Functional module 2 in the step 530:RLC layer is given the some RLC SDU that are dispensed to each carrier wave, add RLC packet header and form some wireless link control protocol data cells (Radio Link Control ProtocolData Unit, RLC PDU), and with it send into the MAC layer.
As shown in Figure 4, in the LTE-A system, network node is provided with an independently scheduling of resource module 11 at each carrier wave in the local mac layer, be used for the Resource Block on each carrier wave is distributed; Therefore, correspondingly, in step 530, (subframe is the minimum time scheduling unit of LTE-A system in each subframe, usually its duration is set to 1ms), functional module 2 need be according to the indication of the scheduling of resource module 11 of MAC layer, the number of the RLC SDU that decision is taken out in each carrier wave buffer queue, and it is added the subsequent operation in RLC packet header.
Some RLCPDU on each carrier wave of 11 pairs of receptions of scheduling of resource module in the step 540:MAC layer carry out cascade or/and cut apart, and it is dispensed on the Resource Block corresponding in each carrier wave.
With carrier wave i is example, i ∈ [1, L], in each subframe, some RLC PDU that functional module 2 on the scheduling of resource module 11 reception carrier i on the carrier wave i transmits, and in corresponding subframe, can the data quantity transmitted size carry out cascade or/and cut apart according to carrier wave i to above-mentioned some RLC PDU, and will be through cascade or/and some RLC PDU of cutting apart be dispensed in the carrier frequency i on the corresponding resource blocks; So-called cascade is about to a plurality of RLC PDU and condenses together, and what is called cuts apart soon that a RLC PDU is divided into a plurality of.
Functional module 3 in the step 550:MAC layer give the some RLC PDU that receive add MAC packet header form transmission blocks (Transport Block, TB),
Functional module 3 in the step 560:MAC layer is sent the TB on each carrier wave into the PHY layer and is transmitted, to send to UE1.
Based on the foregoing description, consult shown in Figure 6, if there be N UE, be respectively UE 1 ... UE N, simultaneously, there be L carrier wave, be respectively carrier wave 1 ... carrier wave L, so, network node just can branch to the downlink data of N UE respectively on L the carrier wave by the flow process of above-mentioned steps 500-step 560 record, make and to pass through L carrier wave, thereby improved the transmission rate of data to a great extent simultaneously to N UE transmitting downlink data.
From the foregoing description as can be seen, in the LTE-A system, only need set up a packet scheduling module 10 at rlc layer, promptly can realize the shunting of UE downlink data based on rlc layer, and design of protocol of following each layer of rlc layer and equipment are realized not needing to change with respect to the LTE system, do like this and can farthest reuse existing protocol design of LTE system and equipment realization, saved the R﹠D costs of LTE-A system to a great extent.
Based on above embodiment, in the LTE-A system, network node is in the process of transmitting downlink data, can be by based on the automatic repetitive requests (Automatic Retransmission Request:ARQ) of rlc layer with based on mixed automatic repeat request (the Hybrid Automatic RetransmissionRequest of MAC layer, HARQ) design, guarantee to arrive the downlink data of UE1, after being resolved to RLCSDU, can arrive PDCP layer in the UE1 in proper order according to setting by UE1.
Perhaps, the downlink data that belongs to UE 1 that transmits on same carrier wave can be according to default sequence arrangement, and the downlink data that belongs to UE1 that transmits on different carrier can send according to default order, to guarantee that the downlink data that UE 1 receives is an order.
For example, as shown in Figure 7, on carrier wave 1, the PDCP sequence number is that 6,7,8 RLC SDU is according to its sequence number sequence arrangement from small to large in the downlink data of UE 1, and on carrier wave 2, the PDCP sequence number is that 9,10 and 11 RLC SDU is also according to its sequence number sequence arrangement from small to large in the data of UE 1; To UE 1 time, network node is earlier 6,7,8 RLC SDU to UE 1 transmission PDCP sequence number by carrier wave 1, set at interval duration (as, 100 milliseconds) after, sending the PDCP sequence number by carrier wave 2 to UE 1 again is 9,10,11 RLC SDU, is 6,7,8,9,10 thereby make the order of the RLC SDU that UE 1 receives; By that analogy, can guarantee to a certain extent just that by the way UE1 receives RLC SDU according to preset order.
In the practical application, because the network environment complexity, each carrier wave may not necessarily arrive according to the order of setting sometimes, like this, just can make UE 1 receive out of order downlink data, thereby influence its subsequent operation.So, for fear of this situation, further guarantee the quality of the downlink data that UE 1 receives, in the present embodiment, UE1 resequences to the RLC SDU that receives at the PDCP of this locality layer, can guarantee further that so just UE 1 receives RLC SDU according to preset order.
Consult shown in the table 1, in order to realize the rearrangement of data, need the setting section parameter, it thes contents are as follows:
Table 1
| Variable/constant name | Meaning |
| ??Last?Submitted?PDCP?RX?SN | Variable, the lower window edge that reorders, i.e. initial value |
| ??Reordering?Window | Constant, the size of the window that reorders |
| ??Maximum?PDCP?SN | Constant, the maximum of PDCP sequence number |
From above-mentioned table 1 as can be seen, in the present embodiment, UE 1 uses the window that reorders in the PDCP of this locality layer the RLC SDU that receives to be reordered, promptly be reserve certain memory space (as, buffer memory), and set the memory space of this memory space, window size (Reordering Window) promptly reorders, and the maximum (Maximum PDCP SN) of setting reorder super initial value of window (Last Submitted PDCP RX SN) and RLC SDUPDCP sequence number, then, UE 1 just can be provided with parameter according to these RLC SDU that receives has been reordered.
For example, the window size that reorders is 5, the window initial value that reorders is 1, the maximum of the RLCSDUPDCP sequence number that can receive is 5, i.e. explanation, the window that reorders can only hold five RLCSDU at most, and the current PDCP of receiving only sequence number is 1,2,3,4 and 5 RLC SDU, and the RLC SDU that does not meet this condition will be dropped (network node can retransmitted after a while).In the process that receives above-mentioned 5 RLCSDU, these 5 RLC SDU are arranged and preserve according to its PDCP sequence number order from small to large, and after receiving, it is mail to the upper strata; Then, the window initial value that reorders becomes 6 by 1, the maximum of the RLC SDUPDCP sequence number that can receive becomes 10 by 5, the window size that reorders still is 5, so, at this moment, it is 6,7,8,9,10 RLC SDU that the window that reorders just can continue to receive the PDCP sequence number, and it is reordered and uploaded, by that analogy.
Certainly, the numbering of PDCP sequence number has regulation, can not infinitely increase, and the maximum of PDCP sequence number is the twice of length of window of reordering.At present, to 10, the PDCP sequence number of next RLC SDU just needs again from 1 open numbering; In like manner, if the maximum of the RLC SDUPDCP sequence number that can receive then also needs again from 1 open numbering greater than 10.
For example: the window initial value that reorders is 8, the maximum of the RLC SDUPDCP sequence number that then can receive is 8+5-10=3, the i.e. explanation current PDCP sequence number that can only receive of window that reorders is 8,9,10 RLC SDU, if receive the PDCP sequence number and be 6 RLC SDU, then it is dropped on outside the window that reorders, abandon.It is behind 10 the RLC SDU that window to be reordered is received the PDCP sequence number, again initial initial value is set to 1, and the maximum of RLC SDUPDCP sequence number is set to 5, like this, the window that reorders just can enter next round RLC SDU and receive, again be that 1 RLCSDU begins to have received the follow-up RLC SDU that is sent to from the PDCP sequence number, by that analogy, UE 1 just can reorder to the whole RLC SDU that parse according to the setting order, thereby improved the accuracy of the downlink data that self receives, do not repeated them here.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment among the present invention and not break away from the spirit and scope of the present invention.Like this, if these in the embodiment of the invention are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the embodiment among the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the intrasystem data distribution method of LTE-A is characterized in that, comprising:
Some Radio Links that the control sub layer of wireless link RLC receiving block data convergence protocol sublayer PDCP of network node issues are controlled service data unit RLC SDU, comprise the communication data of at least one Correspondent Node among the described RLC SDU;
Described rlc layer is assigned on each carrier wave according to some RLC SDU that default scheduling strategy will receive, and the some RLC SDU after will distributing mail to described Correspondent Node by the following protocal layers of this layer.
2. the method for claim 1 is characterized in that, the some RLC SDU after described rlc layer will distribute mail to described Correspondent Node by the following protocal layers of this layer and comprise:
Some RLC SDU after rlc layer will distribute add RLC packet header and form some wireless link control protocol data cell RLC PDU, and it is sent into the MAC layer;
The MAC layer can the data quantity transmitted size in the unit interval according to each carrier wave, and the RLC PDU that is dispensed to each carrier wave is carried out cascade or/and cut apart, and will be through cascade or/and the RLC PDU of cutting apart be dispensed on the Resource Block corresponding in each carrier wave;
Some RLC PDU after described MAC layer will distribute add MAC packet header and form some transmission block TB, and by the PHY layer described some TB are mail to Correspondent Node.
3. the method for claim 1 is characterized in that, described default scheduling strategy comprises Random assignment strategy, poll allocation strategy or load balancing strategy.
4. as claim 1,2 or 3 described methods, it is characterized in that described Correspondent Node is resequenced to described some RLCSDU after receiving some RLC SDU of described network node transmission in the PDCP of this locality layer.
5. method as claimed in claim 4 is characterized in that, described Correspondent Node is resequenced to the some RLC SDU that receive in local PDCP layer and comprised:
The PDCP sequence number of some RLC SDU that described PDCP layer will receive and pre-conditioned comparing obtain comparative result;
Described PDCP layer will meet described pre-conditioned RLC SDU according to described comparative result to be preserved, and according to the PDCP sequence number order from small to large of the RLC SDU that preserves it is sorted;
When described PDCP layer determines that the number of the RLC SDU of preservation reaches setting threshold, it is mail to the above protocal layers of this layer.
6. the intrasystem communicator of LTE-A is characterized in that, comprising:
The packet scheduling module, belong to rlc layer, be used to receive some RLC SDU that the PDCP layer issues, and some RLC SDU that will receive according to default scheduling strategy are assigned on each carrier wave, wherein, the communication data that comprises at least one Correspondent Node among the described RLC SDU;
The rlc layer functional module belongs to rlc layer, is used for the RLC SDU after distributing is mail to described Correspondent Node by the following protocal layers of this layer.
7. communicator as claimed in claim 6, it is characterized in that, some RLC SDU after described rlc layer functional module will be distributed mail to described Correspondent Node by the following protocal layers of this layer and comprise: the some RLC SDU after the rlc layer functional module will be distributed add RLC packet header and form some RLC PDU, and it is sent into the MAC layer; The scheduling of resource module that belongs to the MAC layer can the data quantity transmitted size in the unit interval according to each carrier wave, the RLC PDU that is dispensed to each carrier wave is carried out cascade or/and cut apart, and will be through cascade or/and the RLC PDU of cutting apart be dispensed on the Resource Block corresponding in each carrier wave; Some RLC PDU after MAC layer function module will be distributed add MAC packet header and form some TB, and by the PHY layer described some TB are mail to Correspondent Node.
8. a LTE-A system is characterized in that, comprises a plurality of communicators, and wherein, described communicator comprises:
The packet scheduling module belongs to rlc layer, is used to receive some RLC SDU that the PDCP layer issues,
And some RLC SDU that will receive according to default scheduling strategy are assigned on each carrier wave, wherein, comprise the communication data of at least one Correspondent Node among the described RLC SDU;
The rlc layer functional module belongs to rlc layer, is used for the RLC SDU after distributing is mail to described Correspondent Node by the following protocal layers of this layer.
9. system as claimed in claim 8 is characterized in that, also comprises:
Correspondent Node after being used to receive some RLC SDU of described network node transmission, is resequenced to described some RLC SDU in the PDCP of this locality layer.
10. system as claimed in claim 9, it is characterized in that, when described Correspondent Node is resequenced to the some RLC SDU that receive in local PDCP layer, PDCP sequence number and pre-conditioned comparing with the RLC SDU that receives, obtain comparative result, then, will meet described pre-conditioned RLC SDU according to described comparative result and preserve, and it be sorted according to the PDCP sequence number order from small to large of the RLC SDU that preserves; And when the number of the RLC SDU that determines to preserve reaches setting threshold, it is mail to the above protocal layers of this layer.
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