CN102238122A - Data transmission method, system and device - Google Patents
Data transmission method, system and device Download PDFInfo
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- CN102238122A CN102238122A CN2010101606646A CN201010160664A CN102238122A CN 102238122 A CN102238122 A CN 102238122A CN 2010101606646 A CN2010101606646 A CN 2010101606646A CN 201010160664 A CN201010160664 A CN 201010160664A CN 102238122 A CN102238122 A CN 102238122A
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Abstract
The embodiment of the invention relates to a wireless communication technology, in particular to a data transmission method, a data transmission system and a data transmission device, which are used for solving the problem that inter-signal interference is increased and the utilization rate of resources is decreased by schemes in which cyclic prefixes (CP) are not additionally set in a backhaul link in the prior art. The method provided by the embodiment of the invention comprises that: first network side equipment determines first data to be transmitted; and the first network side equipment transmits the first data by an orthogonal frequency division multiplexing (OFDM) symbol used for data transmission with second network side equipment in the backhaul link, wherein the CP in the OFDM symbol for the transmission with the second network side equipment has a length equal to that of a conventional CP. In the method provided by the invention, the CP can be additionally set in the backhaul link, thereby reducing the inter-signal interference and increasing the utilization rate of the resources; and the CP is the conventional CP, resource overhead is further saved.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of mthods, systems and devices of transfer of data.
Background technology
LTE-A (Long Term Evolution-Advanced, long-term evolution upgrading) system has defined with lower node, interface and link after introducing Relay (relaying) node, shown in Figure 1A,
Node comprises:
Donor-eNB: with RN (relaying) equipment the eNB (evolution base station) of wireless connections is arranged, be abbreviated as DeNB;
Relay-Node: be present in the entity between DeNB and the UE, be abbreviated as RN equipment;
Relay-UE: the UE with RN equipment carries out data interaction is abbreviated as R-UE;
Grand UE: directly and the DeNB UE that carries out data interaction.
Interface comprises:
Un interface: the interface between RN equipment and the DeNB;
Interface between Uu interface: UE and the RN equipment.
Radio Link comprises:
Backhaul link: back haul link, with Un interface link corresponding;
Access link: access link, with Uu interface link corresponding;
Direct link: the direct projection link, DeNB and grand UE carry out the link of transfer of data.
Downlink transfer behind the introducing RN equipment: the data that arrive UE under the RN equipment need send to RN equipment through descending back haul link by DeNB, send to UE by RN equipment through descending access link again.
Uplink behind the introducing RN equipment: the uplink of UE sends to RN equipment by UE through up access link earlier under the RN equipment, sends to DeNB by RN equipment through back haul link again.
For OFDM (Orthogonal Frequency Division Multiplexing, OFDM) system, need to keep orthogonality between subcarrier.If by the time discrete channel, same signal arrives receiving terminal by different paths, because through different paths, the time of advent of signal is also inequality, the OFDM intersymbol of different paths transmission destroys sub-carrier orthogonality with the phase mutual interference.A kind of solution insert exactly Cyclic Prefix (Cyclic Prefix, CP).The insertion of Cyclic Prefix is exactly the beginning of the decline of OFDM symbol being duplicated and being inserted into the OFDM symbol, has increased the length of OFDM symbol.As long as the expansion of the time delay of channel will be avoided intersymbol interference, shown in Figure 1B less than the length of Cyclic Prefix.According to the length difference of Cyclic Prefix, in LTE, Cyclic Prefix is divided into conventional CP and expansion CP.
At present, in the LTE-A system, owing to introduced RN equipment, back haul link does not increase the scheme of CP, thereby has increased the interference between signal, has reduced resource utilization.
Summary of the invention
The embodiment of the invention provides a kind of mthods, systems and devices of transfer of data, and back haul link does not increase the scheme of CP in the prior art in order to solve, thereby has increased the interference between signal, has reduced the problem of resource utilization.
The embodiment of the invention provides a kind of method of transfer of data, and this method comprises:
First network equipment is determined first data to the transmission of second network equipment;
Described first network equipment is by being used for transmitting with second network equipment described first data of the first orthogonal frequency division multiplex OFDM symbol transmission of data in the back haul link subframe;
Wherein, the CP length in the described OFDM symbol equals the length of conventional CP.
The embodiment of the invention provides a kind of system of transfer of data, and this system comprises:
First network equipment is used for definite first data to described second network equipment transmission, by being used for transmitting with second network equipment described first data of the first orthogonal frequency division multiplex OFDM symbol transmission of data in the back haul link subframe;
Second network equipment is used for receiving described first data by an OFDM symbol described in the back haul link subframe;
Wherein, the CP length in the described OFDM symbol equals the length of conventional CP.
The embodiment of the invention provides a kind of relaying RN equipment, and this RN equipment comprises:
The first data determination module is used for definite first data to base station transmits;
First sending module is used for being used for described first data of the first orthogonal frequency division multiplex OFDM symbol transmission with the base station transmits data by the back haul link subframe;
Wherein, the CP length in the described OFDM symbol equals the length of conventional CP.
The embodiment of the invention provides a kind of base station, and this base station comprises:
The second data determination module is used for definite first data to the RN device transmission;
Second sending module is used for being used for described first data of the first orthogonal frequency division multiplex OFDM symbol transmission with the RN equipment transmission data by the back haul link subframe;
Wherein, the CP length in the described OFDM symbol equals the length of conventional CP.
The embodiment of the invention first network equipment is determined first data to the transmission of second network equipment; Described first network equipment is by being used for transmitting with second network equipment described first data of the first orthogonal frequency division multiplex OFDM symbol transmission of data in the back haul link subframe; Wherein, the CP length in the described OFDM symbol equals the length of conventional CP.Owing to can in back haul link, increase CP, thereby reduce the interference between signal, improved resource utilization, and, further also saved resource overhead because CP is conventional CP, can provide more symbol to be used for the transmission of link.
Description of drawings
Figure 1A is the structural representation of LTE-A system in the background technology;
Figure 1B is the schematic diagram that CP inserts in the background technology;
Fig. 2 is the system schematic of embodiment of the invention transfer of data;
Fig. 3 is the structural representation of embodiment of the invention RN equipment;
Fig. 4 is the structural representation of embodiment of the invention base station;
Fig. 5 is the method flow schematic diagram of embodiment of the invention transfer of data;
Fig. 6 A is the schematic diagram of configuration expansion CP in the back haul link descending sub frame of embodiment of the invention RN equipment;
Fig. 6 B is the schematic diagram of the conventional CP of configuration in the back haul link descending sub frame of embodiment of the invention RN equipment;
Fig. 7 A is the schematic diagram of configuration expansion CP in the back haul link sub-frame of uplink of embodiment of the invention RN equipment;
Fig. 7 B is the schematic diagram of the conventional CP of configuration in the back haul link sub-frame of uplink of embodiment of the invention RN equipment.
Embodiment
The embodiment of the invention first network equipment is by being used for transmitting with second network equipment OFDM symbol transmission first data of data in the back haul link subframe; Wherein, the CP length in the OFDM symbol equals the length of conventional CP.Owing to can in back haul link, increase CP, thereby reduce the interference between signal, improved resource utilization, and, further also saved resource overhead because CP is conventional CP.
In force, no matter the size of the channel expansion between base station and the grand user terminal, the OFDM symbol that is used for transfer of data between base station and the RN equipment all disposes conventional CP.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail.
Shown in Figure 2, the data transmission system of the embodiment of the invention comprises: first network equipment 10 and second network equipment 20.
Wherein, the CP length in the OFDM symbol equals the length of conventional CP.
Except CP is arranged, also be useful on the live part of storage first data in the one OFDM symbol.
Perhaps rearmost content was identical in first data of storing in the live part of the OFDM symbol under the content among the CP of the one OFDM symbol and this CP were top.
Concrete, with first data top in perhaps rearmost content be inserted among the CP, the length of insertion equals the length of conventional CP.
If first network equipment 10 is a RN equipment, second network equipment 20 is base stations;
If first network equipment 10 is base stations, second network equipment 20 is a RN equipment.
Describe respectively below.
Situation one, first network equipment 10 are RN equipment, and second network equipment 20 is base stations.
In this case, if RN equipment has the data that need send to the base station, then be used in the sub-frame of uplink by back haul link sending data with the OFDM symbol (i.e. an OFDM symbol) of base station transmits data;
Accordingly, the base station receives data by the OFDM symbol in the sub-frame of uplink of back haul link.
The length of CP can be passed through the semi-static configuration in base station in concrete each OFDM symbol, and by broadcast or high-level signaling (such as RRC (Radio Resource Control, Radio Resource control) signaling) be notified to RN equipment, the rule of also can making an appointment, when being assigned as back haul link sub-frame of uplink or descending sub frame when subframe, the OFDM symbol that is used for the back haul link transmission promptly is configured to conventional CP.
Wherein, the user terminal of R8 and R9 can not be dispatched in the base station in the back haul link subframe, can only dispatch the R10 or the user terminal of highest version more.
Situation two, first network equipment 10 are base stations, and second network equipment 20 is a RN equipment.
In this case, if having, the base station need then be used in the descending sub frame by back haul link sending data to the data of RN equipment transmission with an OFDM symbol of RN equipment transmission data;
Accordingly, RN equipment receives data by the OFDM symbol in the descending sub frame of back haul link.
Further, RN equipment can also be by being used for transmitting with user terminal the 2nd OFDM symbol transmission second data of data in the back haul link descending sub frame;
Wherein, the length of the CP in the 2nd OFDM symbol equals the length of conventional CP or expansion CP.
Concrete, some OFDM symbol is used for as PDCCH (physical downlink control channel, Physical Downlink Control Channel), to user terminal to transmit data in the back haul link descending sub frame of RN equipment.
Identical for the CP length in this part OFDM symbol with CP length in the subframe 0.
That is to say that if the CP in the subframe 0 is conventional CP, the CP that then is used for the OFDM symbol of user terminal transmission is conventional CP; If the CP in the subframe 0 is expansion CP, the CP that then is used for the OFDM symbol of user terminal transmission is expansion CP.
The subframe 0 here is to be used for transmitting broadcast information, synchronizing signal etc., must be configured to the access link descending sub frame, and the length of its CP depends on the channel circumstance of RN sub-district.
The length of CP can be passed through the semi-static configuration in base station in concrete each OFDM symbol, and be notified to RN equipment by broadcast or high-level signaling (such as the RRC signaling), the rule of also can making an appointment, when being assigned as back haul link sub-frame of uplink or descending sub frame when subframe, the OFDM symbol that is used for the back haul link transmission promptly is configured to conventional CP.
Further, the length of CP in the access link subframe can also be determined according to the channel type of access link in the base station; Then according to the length of the CP that determines,, and be notified to RN equipment by broadcast or high-level signaling (such as the RRC signaling) by semi-static configuration.
Concrete, if the channel of access link is long time delay extended channel (such as the cell environment more complicated, many NLOS (Non-Line-Of-Sight, non-direct projection footpath) can think that the time delay ratio is bigger), determine that then CP is expansion CP in the access link subframe; Otherwise determine that CP is conventional CP in the access link subframe.
Wherein, the user terminal of R8 and R9 can not be dispatched in the base station in the back haul link subframe, can only dispatch the R10 or the user terminal of highest version more.
As shown in Figure 3, the RN equipment of the embodiment of the invention comprises: the first data determination module 100 and first sending module 110.
The first data determination module 100 is used for definite first data to base station transmits;
First sending module 110 is used for being used for an OFDM symbol transmission first data with the base station transmits data by the back haul link subframe;
Wherein, the CP length in the OFDM symbol equals the length of conventional CP.
The RN equipment of the embodiment of the invention can further include: first receiver module 120.
Wherein, the RN equipment of the embodiment of the invention can further include: transport module 130.
Wherein, the length of the CP in the 2nd OFDM symbol equals the length of conventional CP or expansion CP.
As shown in Figure 4, the base station of the embodiment of the invention comprises: the second data determination module 200 and second sending module 210.
The second data determination module 200 is used for definite first data to the RN device transmission;
Wherein, the CP length in the OFDM symbol equals the length of conventional CP.
The base station of the embodiment of the invention can further include: second receiver module 220.
Wherein, second sending module 210 can also send the configuration information that is used for semi-static configuration back haul link subframe CP length to RN equipment.
Wherein, second sending module 210 can not be dispatched the user terminal of R8 and R9 in the back haul link subframe, can only dispatch the R10 or the user terminal of highest version more.
As shown in Figure 5, the method for embodiment of the invention transfer of data comprises the following steps:
Step 501, first network equipment are determined first data to the transmission of second network equipment.
Step 502, first network equipment are by being used for transmitting with second network equipment OFDM symbol transmission first data of data in the back haul link subframe.
Wherein, the CP length in the OFDM symbol equals the length of conventional CP.
Can further include after the step 502:
Step 503, second network equipment receive first data by the OFDM symbol in the back haul link subframe.
Except CP is arranged, also be useful on the live part of storage first data in the one OFDM symbol.
Perhaps rearmost content was identical in first data of storing in the live part of the OFDM symbol under the content among the CP of the one OFDM symbol and this CP were top.
Concrete, with first data top in perhaps rearmost content be inserted among the CP, the length of insertion equals the length of conventional CP.
If first network equipment is a RN equipment, second network equipment is the base station;
If first network equipment is the base station, second network equipment is a RN equipment.
Describe respectively below.
Situation one, first network equipment are RN equipment, and second network equipment is the base station.
In this case, if RN equipment has the data that need send to the base station, then be used in the sub-frame of uplink by back haul link sending data with OFDM (the i.e. an OFDM symbol) symbol of base station transmits data;
Accordingly, the base station receives data by the OFDM symbol in the sub-frame of uplink of back haul link.
The length of CP can be passed through the semi-static configuration in base station in concrete each OFDM symbol, and be notified to RN equipment by broadcast or high-level signaling (such as the RRC signaling), the rule of also can making an appointment, when being assigned as back haul link sub-frame of uplink or descending sub frame when subframe, the OFDM symbol that is used for the back haul link transmission promptly is configured to conventional CP.
Wherein, the user terminal of R8 and R9 can not be dispatched in the base station in the back haul link subframe, can only dispatch the R10 or the user terminal of highest version more.
Situation two, first network equipment are the base stations, and second network equipment is a RN equipment.
In this case, if having, the base station need then be used in the descending sub frame by back haul link sending data to the data of RN equipment transmission with an OFDM symbol of RN equipment transmission data;
Accordingly, RN equipment receives data by the OFDM symbol in the descending sub frame of back haul link.
Further, RN equipment can also be by being used for transmitting with user terminal the 2nd OFDM symbol transmission second data of data in the back haul link descending sub frame;
Wherein, the length of the CP in the 2nd OFDM symbol equals the length of conventional CP or expansion CP.Concrete mode is identical with the mode of RN device transmission second data in the situation of Fig. 2 two, does not repeat them here.
The length of CP can be passed through the semi-static configuration in base station in concrete each OFDM symbol, and be notified to RN equipment by broadcast or high-level signaling (such as the RRC signaling), the rule of also can making an appointment, when being assigned as back haul link sub-frame of uplink or descending sub frame when subframe, the OFDM symbol that is used for the back haul link transmission promptly is configured to conventional CP.
Further, the length of CP in the access link subframe can also be determined according to the channel type of access link in the base station; Then according to the length of the CP that determines,, and be notified to RN equipment by broadcast or high-level signaling (such as the RRC signaling) by semi-static configuration.
Concrete, if the channel of access link is the long time delay extended channel, determine that then CP is expansion CP in the access link subframe; Otherwise determine that CP is conventional CP in the access link subframe.
Wherein, the user terminal of R8 and R9 can not be dispatched in the base station in the back haul link subframe, can only dispatch the R10 or the user terminal of highest version more.
Suppose that OFDM symbol subcarrier spacing is Δ f=5kHz, expansion CP length is 512T
s, conventional CP is 160T
sOr 144T
s, T wherein
s=1/ (15000 * 2048)
s
Suppose that the back haul link descending sub frame all adopts expansion CP, have 12 OFDM symbols in this subframe, suppose that preceding two OFDM symbols are used for PDCCH, transmission/reception takies an OFDM symbol switching time, therefore the OFDM symbol that is used for the downlink data reception is symbol 3-11, totally 9 OFDM symbols are referring to Fig. 6 A.
If other OFDM symbols except that the OFDM that PDCCH partly takies are configured to conventional CP, because conventional CP expands CP relatively and takies less time-domain resource, change configuration and can save a part of time-domain resource, the time-domain resource of saving is:
(512T
s-160T
s) * 10=3520T
s≈ 115us or (512T
s-144T
s) * 10=3680T
s≈ 120u
s
Length of field is 2208T when adopting the OFDM symbol of conventional CP
sOr 2192T
s, therefore saving can provide and an outer OFDM symbol is used for downlink data and receives, and in addition remaining time-domain resource is 1312T
s≈ 43us or 1488T
s≈ 48us.Be 17us-20us transmission/switching time of supposing RN equipment, and remaining time-domain resource still can provide time enough to be used for transmission/reception switching.As shown in Figure 5, compare Fig. 4, the OFDM symbol that is used for the back haul link downlink transfer is symbol 3-12, totally 10 symbols, and disposing conventional CP can more than enoughly provide an OFDM symbol to be used for the back haul link downlink transfer, referring to Fig. 6 B.
For the back haul link uplink, assumed condition is identical with downlink transfer.Suppose in the back haul link sub-frame of uplink, all OFDM symbols all are configured to expand CP, have 12 DFT-OFDM symbols in the whole subframe, suppose to switch between transmission and reception to consume an OFDM symbol, have the uplink that 11 symbols can be used for back haul link, referring to Fig. 7 A.
If all symbols of back haul link sub-frame of uplink all are configured to conventional CP, then in each subframe 14 OFDM symbols will be arranged this moment, suppose still to consume switching time a symbol, to there be 13 symbols to can be used for the uplink of back haul link, compare configuration expansion CP, disposing conventional CP can provide two OFDM symbols to be used for the uplink of back haul link more, referring to Fig. 7 B.
The embodiment of the invention is for base station side:
Supporting under the scene that big sub-district (referring to the sub-district that covering radius is bigger) covers that in DeNB and subframe that M-UE communicates by letter, the OFDM symbol need be configured to expand CP, avoids intersymbol interference.In the back haul link ascending-descending subframes of DeNB and RN devices communicating, DeNB disposes conventional CP by high-level signaling for the OFDM symbol in this subframe, and in these subframes, DeNB does not dispatch the transmission of R8 (version 8) M-UE.
For the RN equipment side:
RN equipment, needs configuration expansion CP, otherwise is configured to conventional CP if the channel of access link is the long time delay extended channel by the CP of the OFDM symbol in the semi-static configuration access link of the high-level signaling ascending-descending subframes;
For the back haul link ascending-descending subframes, the CP that is used for the OFDM symbol of communicating by letter with DeNB in these subframes of RN equipment disposition is conventional CP.Just, for the back haul link descending sub frame, because this sub-frame configuration is MB SFN (MB SFN Multicast Broadcast Single Frequency Network, Multicast Broadcast Single Frequency Network) subframe, the CP of previous or two OFDM symbols of subframe is according to the channel conditions configuration of relaying sub-district, such as keeping identical with the CP configuration of subframe 0, the CP of other symbols is configured to conventional CP; For the back haul link sub-frame of uplink, the CP of all symbols is configured to conventional CP in the subframe.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
From the foregoing description as can be seen: the embodiment of the invention first network equipment is determined first data to the transmission of second network equipment; First network equipment is by being used for transmitting with second network equipment described first data of an OFDM symbol transmission of data in the back haul link subframe; Wherein, the CP length in the OFDM symbol equals the length of conventional CP.
Owing to can in back haul link, increase CP, thereby reduce the interference between signal, improved resource utilization, and, further also saved resource overhead because CP is conventional CP, can provide more symbol to be used for the transmission of link.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the method for a transfer of data is characterized in that, this method comprises:
First network equipment is determined first data to the transmission of second network equipment;
Described first network equipment is by being used for transmitting with second network equipment described first data of the first orthogonal frequency division multiplex OFDM symbol transmission of data in the back haul link subframe;
Wherein, the cyclic prefix CP length in the described OFDM symbol equals the length of conventional CP.
2. the method for claim 1 is characterized in that, described first network side also comprises after transmitting described first data:
Described second network equipment receives described first data by the described OFDM symbol in the back haul link subframe.
3. method as claimed in claim 1 or 2 is characterized in that,
If described first network equipment is a relaying RN equipment, described second network equipment is the base station;
If described first network equipment is the base station, described second network equipment is a RN equipment.
4. method as claimed in claim 3 is characterized in that, described first network equipment is the base station, and described second network equipment is a RN equipment;
Described method also comprises:
Described RN equipment is by being used for transmitting with user terminal the 2nd OFDM symbol transmission second data of data in the back haul link descending sub frame;
Wherein, the length of the CP in described the 2nd OFDM symbol equals the length of conventional CP or expansion CP.
5. the system of a transfer of data is characterized in that, this system comprises:
First network equipment is used for definite first data to described second network equipment transmission, by being used for transmitting with second network equipment described first data of the first orthogonal frequency division multiplex OFDM symbol transmission of data in the back haul link subframe;
Second network equipment is used for receiving described first data by a described OFDM symbol of back haul link subframe;
Wherein, the cyclic prefix CP length in the described OFDM symbol equals the length of conventional CP.
6. system as claimed in claim 5 is characterized in that, if described second network equipment is a RN equipment, described second network equipment also is used for:
By being used for transmitting the 2nd OFDM symbol transmission second data of data in the back haul link descending sub frame with user terminal;
Wherein, the length of the CP in described the 2nd OFDM symbol equals the length of conventional CP or expansion CP.
7. a relaying RN equipment is characterized in that, this RN equipment comprises:
The first data determination module is used for definite first data to base station transmits;
First sending module is used for being used for described first data of the first orthogonal frequency division multiplex OFDM symbol transmission with the base station transmits data by the back haul link subframe;
Wherein, the cyclic prefix CP length in the described OFDM symbol equals the length of conventional CP.
8. RN equipment as claimed in claim 7 is characterized in that, described RN equipment also comprises:
First receiver module is used for receiving data by a described OFDM symbol of back haul link subframe.
9. as claim 7 or 8 described RN equipment, it is characterized in that described RN equipment also comprises:
Transport module is used for being used for the 2nd OFDM symbol transmission second data with user terminal transmission data by the back haul link descending sub frame;
Wherein, the length of the CP in described the 2nd OFDM symbol equals the length of conventional CP or expansion CP.
10. a base station is characterized in that, this base station comprises:
The second data determination module is used for definite first data to the RN device transmission;
Second sending module is used for being used for described first data of the first orthogonal frequency division multiplex OFDM symbol transmission with the RN equipment transmission data by the back haul link subframe;
Wherein, the cyclic prefix CP length in the described OFDM symbol equals the length of conventional CP.
11. base station as claimed in claim 10 is characterized in that, described base station also comprises:
Second receiver module is used for receiving data by a described OFDM symbol of back haul link subframe.
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| CN2010101606646A CN102238122A (en) | 2010-04-26 | 2010-04-26 | Data transmission method, system and device |
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| CN104969488A (en) * | 2013-01-31 | 2015-10-07 | Lg电子株式会社 | Method for setting cyclic prefix for d2d (device-to-device) communication in radio communications system and apparatus therefor |
| CN107409393A (en) * | 2015-01-22 | 2017-11-28 | 德州仪器公司 | Low overhead signaling for point-to-multipoint NLOS wireless backhauls |
| CN112583751A (en) * | 2019-09-27 | 2021-03-30 | 华为技术有限公司 | Communication method, device and equipment |
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