CN103634778A - Method and device for transmitting data in LTE system - Google Patents
Method and device for transmitting data in LTE system Download PDFInfo
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- CN103634778A CN103634778A CN201210301176.1A CN201210301176A CN103634778A CN 103634778 A CN103634778 A CN 103634778A CN 201210301176 A CN201210301176 A CN 201210301176A CN 103634778 A CN103634778 A CN 103634778A
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Abstract
The invention discloses a method for transmitting data in a LTE system. The method comprises the following steps: a D2D bearer is established between terminal UE through user-to-user communication (D2D) control signaling; the D2D control signaling is transmitted by utilizing a first cellular signaling wireless bearer SRB so as to establish a D2D data wireless bearer DRB; and data on the first cellular SRB is multiplexed into a first MAC PDU, data on the D2D DRB is multiplexed into a second MAC PDU, and then the first MACPDU is mapped onto a cellular resource, and the second MAC PDU is mapped onto a D2D resource. A device for transmitting data in a LTE system is further disclosed. By applying embodiments of the invention, the UE transmitting power can be reduced, and the network side load can be reduced.
Description
Technical field
The application relates to communication technical field, more specifically, relates to the method and apparatus that transmits data in a kind of LTE system.
Background technology
In existing Long Term Evolution (LTE) system, terminal (UE)/base station (eNB) is that layering is carried out to the processing of data, to send data instance.First UE/eNB arrives dissimilar data-mapping on different radio bearers (RB), this comprises Signaling Radio Bearer (SRB) for control channel and for the Data Radio Bearer (DRB) of service data transmission, then carry out the processing of PDCP (PDCP) layer, then carry out the processing of wireless link control (RLC) layer, then the processing that gets involved control (MAC) layer by media, by the MAC PDU of the data-reusing on different bearer, is finally mapped to whole MAC PDU in physical layer uplink/downlink resource and transmits.The processing procedure that receives data is contrary with above process.Data handling procedure in UE/eNB is referring to accompanying drawing 1, and this process is called cellular transmission.UE/eNB may set up a plurality of DRB for dissimilar business, support at most that UE/eNB sets up 8 DRB, so in accompanying drawing 1, the value of n is less than or equal to 8 in existing system.
In LTE system, the transfer of data between two UE is all to realize by the relaying of network side.First transmitting terminal UE will send to network side by communication data, afterwards network side again by this data retransmission to receiving terminal UE.
Even if two very near UE of distance need communication, communication data also must just can be issued the other side through the transmission of network side.UE need to be used larger transmitting power like this, and has increased the unnecessary load of network side.
Summary of the invention
The embodiment of the present invention proposes to transmit in a kind of LTE system the method for data, can reduce the transmitting power of UE, reduces the load of network side.
The embodiment of the present invention also proposes to transmit in a kind of LTE system the device of data, can reduce the transmitting power of UE, reduces the load of network side.
The technical scheme of the embodiment of the present invention is as follows:
In LTE system, transmit a method for data, described method comprises:
By user, to telex network (D2D) control signal, between terminal UE, set up D2D carrying;
Utilize the first cellular signaling radio bearer SRB transmission D2D control signal, to set up D2D Data Radio Bearer DRB;
By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MAC PDU on D2D DRB, then a described MAC PDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.
Described method further comprises:
By honeycomb control signal, between UE and eNB, setting up honeycomb carries;
Utilize the second honeycomb SRB transmission honeycomb control signal, to set up honeycomb DRB;
By in the MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, a described MAC PDU is mapped on cell resource.
Described D2D resource and described cell resource quadrature.
Described the first honeycomb SRB is identical with the second honeycomb SRB.
Before the described D2D of foundation carrying, further comprise: newly-built the first honeycomb SRB.
In LTE system, transmit a device for data, described device comprises the first module,
The first module is used for:
By user, to telex network (D2D) control signal, between terminal UE, set up D2D carrying;
Utilize the first cellular signaling radio bearer SRB transmission D2D control signal, to set up D2D Data Radio Bearer DRB;
By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MAC PDU on D2D DRB, then a described MAC PDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.
Described device further comprises the second module;
Described the second module is carried for setting up honeycomb by honeycomb control signal between UE and eNB;
Utilize the second honeycomb SRB transmission honeycomb control signal, to set up honeycomb DRB;
By in the three MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, described the 3rd MAC PDU is mapped on cell resource.
Base station eNB, when setting up D2D carrying, is described the first module assignment D2D sign; ENB is designated according to D2D the cell resource that UE distributes transmission D2D control signal, and the D2D resource of transmission D2D business datum;
ENB, when setting up honeycomb carrying, is described the second module assignment cell identities; ENB is the cell resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
Described eNB is designated UE according to D2D and distributes the cell resource of transmission D2D control signal to comprise: eNB is designated according to D2D the D2D cell resource that UE distributes transmission D2D control signal;
Described eNB is that UE distributes the cell resource of transmission honeycomb control signal and cellular services data to comprise according to cell identities: eNB is the normal cellular resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
Described eNB is designated UE according to D2D and distributes the cell resource of transmission D2D control signal to comprise: eNB is designated according to D2D the general cell resource that UE distributes transmission D2D control signal;
Described eNB is that UE distributes the cell resource of transmission honeycomb control signal and cellular services data to comprise according to cell identities: eNB is the general cell resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
From technique scheme, can find out, by D2D control signal, between UE, set up D2D in embodiments of the present invention and carry; Recycle the first honeycomb SRB transmission D2D control signal, to set up D2D DRB; By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MACPDU on D2D DRB, then a described MAC PDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.Like this, between the UE of LTE system, set up D2D carrying, due to the close together between UE, therefore adopt D2D transmission can reduce the transmitting power of UE, and reduce the load of network side.
Accompanying drawing explanation
Fig. 1 is the data handling procedure schematic diagram of UE/eNB in existing LTE system;
Fig. 2 is the central controlled D2D transmission of network side in LTE system;
Fig. 3 is D2D transmission and the parallel schematic diagram of cellular transmission in LTE system;
Fig. 4 is the method flow schematic diagram of transfer of data in LTE system;
Fig. 5 is UE side data handling process schematic diagram in embodiment mono-;
Fig. 6 is UE side data handling process schematic diagram in embodiment bis-;
Fig. 7 is eNB side data handling process schematic diagram in embodiment bis-;
Fig. 8 is UE side data handling process schematic diagram in embodiment tri-;
Fig. 9 is eNB side data handling process schematic diagram in embodiment tri-;
Figure 10 is UE side data handling process schematic diagram in embodiment tetra-;
Figure 11 is eNB side data handling process schematic diagram in embodiment tetra-.
Embodiment
For making the object, technical solutions and advantages of the present invention express clearlyer, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, by D2D control signal, setting up D2D between UE carries; Recycle a SRB transmission D2D control signal, to set up D2D DRB; By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MAC PDU on D2D DRB, then a described MACPDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.Between the UE of the close together of LTE system, set up D2D carrying.Due to the close together between UE, therefore adopt D2D transmission than traditional cellular transmission, the transmission data of UE no longer need through network side, have therefore reduced the transmitting power of UE, and have reduced the load of network side.
D2D is the application scenarios for transmitting terminal UE and receiving terminal UE close together, direct business transferring data between two UE now, and no longer need network side to carry out relay transmission.Referring to accompanying drawing 2, eNB controls direct service data transmission between UE1 and UE2 by D2D control signal.Introduce after D2D transmission, UE may, when carrying out D2D transmission, carry out original cellular transmission.Referring to accompanying drawing 3, UE, when sending data to D2D opposite end UE, converses by cellular transmission and other UE.
Embodiment mono-
Below in conjunction with accompanying drawing 4, describe the technical scheme of the embodiment of the present invention one in detail.While realizing the transmission of D2D between UE in LTE system, can also carry out cellular transmission of the prior art simultaneously.
In order to control D2D transmission, UE/eNB need to define D2D control signal, can reuse original honeycomb control signal (RRC signaling) and it is modified or expands to support D2D transmission, also can define special-purpose D2D control signal.Function and original honeycomb control signal that D2D control signal is realized are similar, comprise foundation, reconstruction and the release of D2D communication link, foundation, modification and the release etc. of D2D carrying.By D2D control signal, setting up D2D between UE carries.
UE/eNB sets up the first honeycomb SRB with transmission honeycomb control signal, this comprises original SRB0, SRB1 and SRB2, UE/eNB is mapped to the first honeycomb SRB above by honeycomb control signal and D2D control signal afterwards, i.e. original the first honeycomb SRB is reused in the transmission of D2D control signal.
UE/eNB sets up the first honeycomb DRB with transmission cellular services data.In order to transmit D2D business datum, the UE at two ends need to set up D2D DRB.That is to say, UE will set up honeycomb DRB and D2D DRB simultaneously, and eNB only need to set up honeycomb DRB.When eNB sets up the DRB of UE side by control signal, need to indicate this DRB of UE is honeycomb DRB or D2D is DRB.This can, by original RRC signaling is expanded to realize, as increased and be used to indicate the cell of DRB type in original " RadioResourceConfigDedicated " cell, or distribute special-purpose sign scope etc. for D2D DRB; Also can realize by the special-purpose D2D control signal of new definition, as message is set up in new D2D carrying.
ENB need to distribute for UE the resource of two types: cell resource and D2D resource.Cell resource is for control channel (comprising honeycomb control signal and D2D control signal) and cellular services data between UE and eNB.D2D resource is for transmitting D2D business datum between UE and opposite end UE.Wherein, for fear of D2D resource and the mutual interference of cell resource phase, set D2D resource and cell resource quadrature.
When UE sends data, for honeycomb DRB, UE, by the MAC PDU of the data-reusing to the on the data on these DRB and SRB, is then mapped to a MAC PDU on cell resource.For D2D DRB, UE, by the two MAC PDU of the data-reusing to the on these DRB, is then mapped to the 2nd MAC PDU in D2D resource.The DRP data reception process of UE is contrary with process of transmitting.Shown in the data handling procedure accompanying drawing 5 of UE side.
In accompanying drawing 5, when UE carries out data transmission, need to send to the business datum of eNB and control signal to be multiplexed in a MAC PDU, be then mapped on cell resource; In addition, need to send in data-reusing to the two MAC PDU of opposite end UE, be mapped to afterwards in D2D resource.
Current LTE system supports at most UE to set up 8 DRB, and after introducing D2D, UE may need to carry out cellular transmission and D2D transmission simultaneously, can certainly only carry out D2D transmission.Now 8 DRB may be not enough, therefore can increase the DRB number that UE supports at most, as 8 honeycomb DRB and 8 D2DDRB are set up in maximum supports.
The data handling procedure of eNB is identical with existing system.When eNB carries out data transmission, by the MAC PDU of the data-reusing to the on the data on SRB and honeycomb DRB, then a MAC PDU is mapped in cellular downlink resource, the DRP data reception process of eNB is contrary with process of transmitting.
Embodiment bis-
Embodiment bis-and embodiment mono-are similar, and difference is that UE/eNB sets up new special-purpose SRB for D2D control signal, as SRB3, SRB4 etc.The sign scope of original honeycomb SRB is 0,1,2, so embodiment bis-need to expand the sign scope of SRB.
In accompanying drawing 6, for D2D control signal is set up new SRB3, SRB3 is newly-built D2D SRB, utilizes D2DSRB transmission D2D control signal.
Embodiment tri-
In actual application, can realize transfer of data by use device.In LTE system, can also carry out respectively D2D transmission and cellular transmission with the form of two modules.For example:
The first module is used for: by D2D control signal, set up D2D between UE and carry; Utilize the first honeycomb SRB transmission D2D control signal, to set up D2D DRB; The first honeycomb SRB is multiplexed in a MAC PDU, in data-reusing to the two MAC PDU on D2D DRB, then a described MAC PDU is mapped on D2D cell resource, described the 2nd MAC PDU is mapped in D2D resource.
The second module is used for: by honeycomb control signal, between UE and eNB, set up honeycomb and carry; Utilize the second honeycomb honeycomb SRB transmission honeycomb control signal, to set up honeycomb DRB; By in the three MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, described the 3rd MAC PDU is mapped on cell resource.
Wherein, the work that the first module and the second module can be separate, is independent of each other; Also can work simultaneously carry out respectively D2D transmission and cellular transmission.
ENB need to be for the first module and two the different signs of the second module assignment (RNTI) of UE.For the second module, carry out the module of cellular transmission, eNB, for it distributes a honeycomb RNTI, can be original C-RNTI.For the first module, carry out the module of D2D transmission, eNB distributes a D2D RNTI for it, and this can be original C-RNTI, can be also the new RNTI introducing, as D-RNTI.ENB is that it distributes D2D RNTI when UE sets up D2D connection.
ENB is used the honeycomb RNTI of UE for UE distribution normal cellular resource, for transmitting honeycomb control signal and cellular services data between UE and eNB.The D2D RNTI that eNB is used UE distributes two types of resources for UE: for transmitting the D2D cell resource of D2D control signal between UE and eNB and for transmitting the D2D resource of D2D business datum between UE and opposite end UE.ENB is that UE carries out resource and divides timing, need to guarantee that D2D cell resource and normal cellular resource are quadratures.Wherein, normal cellular resource is used for transmitting honeycomb control signal and cellular services data; D2D cell resource is used for transmitting D2D control signal.
UE/eNB sets up for transmitting the second honeycomb SRB(honeycomb SRB of honeycomb control signal by the second module) and for transmitting the honeycomb DRB of cellular services data.UE/eNB, by the three MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, is then mapped to the 3rd MAC PDU in normal cellular resource.Data handling procedure in the second module is identical with original system.
UE/eNB sets up for transmitting the first honeycomb SRB of D2D control signal and for transmitting the D2D DRB of D2D business datum by the first module.UE/eNB, by the MAC PDU of the data-reusing to the on the first honeycomb SRB, is then mapped to a MAC PDU on D2D cell resource.UE, by the two MAC PDU of the data-reusing to the on D2D DRB, is then mapped to the 2nd MAC PDU in D2D resource.
Referring to accompanying drawing 8, are the UE side data handling process schematic diagrames in embodiment tri-, dotted line left side is the second module, and right side is the first module.When UE carries out cellular data transmission, need to send to the cellular data of eNB and honeycomb control signal to be multiplexed in the 3rd MAC PDU, then be mapped in normal cellular resource.When UE carries out the transmission of D2D data, need to send to the D2D control signal of eNB to be multiplexed into a MAC PDU, then be mapped on D2D cell resource; Need to send in data-reusing to the two MAC PDU of UE, then be mapped in D2D resource.
Accompanying drawing 9 is eNB side data handling process schematic diagrames in embodiment tri-, and dotted line left side is the second module, and right side is the first module.When eNB carries out cellular data transmission, need to send to the cellular data of UE to be multiplexed into a MAC
In PDU, be then mapped in normal cellular resource.During eNB transmission D2D control signal, need to send to the D2D control signal of UE to be multiplexed in another MAC PDU, then be mapped on D2D cell resource.
Embodiment tetra-
Embodiment tetra-and embodiment tri-are similar, difference is to need to cooperate between the second module and the first module, all RB(in the second module are comprised to honeycomb SRB and honeycomb DRB) on data and the data-reusing on the D2D SRB in the first module in same MAC PDU, then this MAC PDU is mapped on general cell resource.General cell resource is for transmitting the data between all UE and eNB, and this comprises honeycomb control signal, cellular services data and D2D control signal.
ENB need to distribute for UE the resource of two types: by honeycomb RNTI or D2D RNTI, be that UE distributes general cell resource; By D2D RNTI, be that UE distributes D2D resource.
Referring to accompanying drawing 10, are the UE side data handling process schematic diagrames in embodiment tetra-, dotted line left side is the second module, and right side is the first module.When UE carries out data transmission, need to send to honeycomb control signal, cellular services data and the D2D control signal of eNB to be multiplexed in same MAC PDU, then be mapped on general cell resource; Need to send to the D2D business datum of opposite end UE to be multiplexed in another MAC PDU, then be mapped in D2D resource.
Accompanying drawing 11 is eNB side data handling process schematic diagrames in embodiment tetra-, and dotted line left side is the second module, and right side is the first module.When eNB carries out data transmission, need to send to honeycomb control signal, cellular services data and the D2D control signal of UE to be multiplexed in same MAC PDU, then be mapped on general cell resource.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. in LTE system, transmit a method for data, it is characterized in that, described method comprises:
By user, to telex network (D2D) control signal, between terminal UE, set up D2D carrying;
Utilize the first cellular signaling radio bearer SRB transmission D2D control signal, to set up D2D Data Radio Bearer DRB;
By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MAC PDU on D2D DRB, then a described MAC PDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.
2. transmit according to claim 1 the method for data in LTE system, it is characterized in that, described method further comprises:
By honeycomb control signal, between UE and eNB, setting up honeycomb carries;
Utilize the second honeycomb SRB transmission honeycomb control signal, to set up honeycomb DRB;
By in the MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, a described MACPDU is mapped on cell resource.
3. transmit according to claim 1 the method for data in LTE system, it is characterized in that described D2D resource and described cell resource quadrature.
4. transmit according to claim 2 the method for data in LTE system, it is characterized in that, described the first honeycomb SRB is identical with the second honeycomb SRB.
5. transmit according to claim 1 the method for data in LTE system, it is characterized in that, before the described D2D of foundation carrying, further comprise: newly-built the first honeycomb SRB.
6. in LTE system, transmit a device for data, it is characterized in that, described device comprises the first module,
The first module is used for:
By user, to telex network (D2D) control signal, between terminal UE, set up D2D carrying;
Utilize the first cellular signaling radio bearer SRB transmission D2D control signal, to set up D2D Data Radio Bearer DRB;
By in the MAC PDU of the data-reusing to the on the first honeycomb SRB, in data-reusing to the two MAC PDU on D2D DRB, then a described MAC PDU is mapped on cell resource, described the 2nd MAC PDU is mapped in D2D resource.
7. transmit according to claim 6 the device of data in LTE system, it is characterized in that, described device further comprises the second module;
Described the second module is carried for setting up honeycomb by honeycomb control signal between UE and eNB;
Utilize the second honeycomb SRB transmission honeycomb control signal, to set up honeycomb DRB;
By in the three MAC PDU of the data-reusing to the on the second honeycomb SRB and honeycomb DRB, described the 3rd MACPDU is mapped on cell resource.
8. transmit according to claim 7 the device of data in LTE system, it is characterized in that,
Base station eNB, when setting up D2D carrying, is described the first module assignment D2D sign; ENB is designated according to D2D the cell resource that UE distributes transmission D2D control signal, and the D2D resource of transmission D2D business datum;
ENB, when setting up honeycomb carrying, is described the second module assignment cell identities; ENB is the cell resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
9. transmit according to claim 8 the device of data in LTE system, it is characterized in that,
Described eNB is designated UE according to D2D and distributes the cell resource of transmission D2D control signal to comprise: eNB is designated according to D2D the D2D cell resource that UE distributes transmission D2D control signal;
Described eNB is that UE distributes the cell resource of transmission honeycomb control signal and cellular services data to comprise according to cell identities: eNB is the normal cellular resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
10. transmit according to claim 8 the device of data in LTE system, it is characterized in that,
Described eNB is designated UE according to D2D and distributes the cell resource of transmission D2D control signal to comprise: eNB is designated according to D2D the general cell resource that UE distributes transmission D2D control signal;
Described eNB is that UE distributes the cell resource of transmission honeycomb control signal and cellular services data to comprise according to cell identities: eNB is the general cell resource that UE distributes transmission honeycomb control signal and cellular services data according to cell identities.
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