CN105338568A - LTE transmitting method and device on unauthorized frequency spectrum - Google Patents
LTE transmitting method and device on unauthorized frequency spectrum Download PDFInfo
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- CN105338568A CN105338568A CN201510622135.6A CN201510622135A CN105338568A CN 105338568 A CN105338568 A CN 105338568A CN 201510622135 A CN201510622135 A CN 201510622135A CN 105338568 A CN105338568 A CN 105338568A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
Abstract
The invention discloses a LTE transmitting method and device on an unauthorized frequency spectrum in order to transmit a DRS and a PDSCH in the same subframe. The method comprises steps of: monitoring the unauthorized frequency spectrum on the basis of a LBT mechanism sending the PDSCH; when channel idle is monitored, the time of the DRS and the time of the DMTC are superposed in the channel occupation time, and a DRS sendable position is included in the superposed time, simultaneously sending the DRS and the PDSCH in the same subframe in the channel occupation time, wherein the same subframe includes the DRS sendable position. The method and the device may simultaneously transmit the DRS and the PDSCH on the unauthorized frequency spectrum in order to provide a user with good broadband experience, high speed, and good stability and mobile convenience, and coexist with WiFi.
Description
Technical field
The present invention relates to the communications field, particularly relate to transmission method and the device of the LTE in unlicensed spectrum.
Background technology
Along with the sharply increase of message volume, third generation partner program (3rdGenerationPartnershipProject, 3GPP) is authorized frequency spectrum to seem and is more and more not enough to provide higher network capacity.In order to improve the utilization of frequency spectrum resource further, 3GPP is just discussing how under the help of authorizing frequency spectrum, to use unlicensed spectrum, as 2.4GHz and 5GHz frequency range.The current mainly WiFi of these unlicensed spectrums, bluetooth, radar, the systems such as medical treatment are in use.In general, the access technology designed for authorizing frequency range, as Long Term Evolution (LongTermEvolution, LTE) technology is not suitable for using in unauthorized frequency range.Because the requirement that this kind of access technology of LTE is optimized spectrum efficiency and Consumer's Experience is very high.
And carrier aggregation function allows and LTE is deployed in unauthorized frequency range becomes possibility.3GPP proposes the concept of the auxiliary access technology (LTEAssistedAccess, LAA) of LTE, authorizes the help of frequency spectrum to use unlicensed spectrum by LTE.Compare WiFi, the LTE being operated in unauthorized frequency range has the ability to provide higher spectrum efficiency and larger coverage effect, allows data traffic authorize seamless switching between frequency range and unauthorized frequency range based on same core net simultaneously.Concerning user, this means better broadband experience, higher speed, better stability and mobile facility.
In mandate frequency range, owing to there being good orthogonality to ensure that interference level in LTE network, so the downstream transmission of base station and subscriber equipment need not consider whether have other base stations or subscriber equipment transmitting around.But whether have around also not considering when if LTE uses in unauthorized frequency range other equipment use unauthorized frequency range, so will bring great interference to WiFi equipment.Because in LTE technology, as long as subscriber equipment has business just to transmit, without any monitoring rule, and WiFi equipment just cannot be transmitted when LTE has business to transmit, and can only wait until that LTE business is transmitted, just can channel clear be detected, transmit.
In order to better coexist with WiFi, plan in the industry in LTE, increase a kind of listem-before-talk (ListenBeforeTalk, LBT) mechanism.Like this, if LTE detects channel busy in unlicensed spectrum, then can not take this frequency range, if detect that channel is not busy, just can take.Such as, LTE for sending PDSCH (PhysicalDownlinkSharedChannel, Physical Downlink Shared Channel) data in unlicensed spectrum, then needs to adopt LBT mechanism channel idle to be detected, could send PDSCH by busy channel.
In order to realize the function such as cell measurement, Time and Frequency Synchronization, community (base station) needs to send DRS (Discoveryreferencesignal, find reference signal), DRS sends the time taking 6ms (millisecond), this 6ms time is called DMTC (configuration of DRSMeasurementtimingconfiguration, the DRS Measuring Time) time.DMTC periodically occurs, the minimum period is the length of 40ms, DMTC is 6ms.And in unlicensed spectrum, in order to reduce the interference to WiFi, 3GPP determines the sent position configuring multiple DRS in DMTC at present, and need the LBT carrying out sending based on DRS machine-processed before transmitting, if channel idle detected, just can take.
In unlicensed spectrum, how DRS and PDSCH sends in same subframe, and being needs research at present.
Summary of the invention
The object of this invention is to provide transmission method and the device of the LTE in unlicensed spectrum, send in same subframe to realize DRS and PDSCH.
For achieving the above object, the invention provides following scheme:
A transmission method of LTE in unlicensed spectrum, comprising:
Whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
Listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends described DRS and PDSCH simultaneously, described same subframe comprises DRS and can send position, described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
A transmission method of LTE in unlicensed spectrum, comprising:
Be received in the data that unlicensed spectrum is transmitted, described data are included in DRS and the PDSCH that same subframe sends simultaneously;
To described decoding data;
Wherein, DRS and PDSCH is base station side listens in unlicensed spectrum channel idle based on the LBT mechanism for sending PDSCH, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends simultaneously, described same subframe comprises DRS and can send position, described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
A transmitting device of LTE in unlicensed spectrum, comprising:
First monitoring unit is used for, and whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
Transmitting element is used for, listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends described DRS and PDSCH simultaneously, and described same subframe comprises DRS can send position, and described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
A transmitting device of LTE in unlicensed spectrum, comprising:
First monitoring unit is used for, and whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
Transmitting element is used for, listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends described DRS and PDSCH simultaneously, and described same subframe comprises DRS can send position, and described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
According to specific embodiment provided by the invention, the invention discloses following technique effect:
The channel idle in unlicensed spectrum is listened to based on LTB, and, comprise one or more DRS in this Channel holding time when can send position, the same subframe in above-mentioned Channel holding time sends DRS and PDSCH simultaneously.Implement embodiments of the invention, DRS and PDSCH in unlicensed spectrum can be realized and send simultaneously, bring better broadband experience, higher speed, better stability and mobile facility to user, better can coexist with WiFi simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of applied environment schematic diagram of the transmission method that Fig. 1 provides for the embodiment of the present invention;
Fig. 2,7 is PDSCH and DMTC phase " collision " schematic diagram that the embodiment of the present invention provides;
Fig. 3,4,6,8,11,14,15 is respectively the transmission method schematic flow sheet of the LTE in base station side unlicensed spectrum that various embodiments of the present invention provide;
The LTE frame structure schematic diagram that Fig. 5 provides for the embodiment of the present invention;
Fig. 9 a, 9b, 10,12, the 13 time-frequency resource allocating schematic diagrames provided for the embodiment of the present invention;
The transmitting device structural representation of the LTE in the unlicensed spectrum that Figure 16-18 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The embodiment of the present invention is for protecting transmission method and the relevant device of the LTE in unlicensed spectrum.
Above-mentioned transmission method can be applied to (but being not limited to) Wireless Telecom Equipment such as AP (AccessPoint, radio node), Wifi terminal, Relay station of base station, terminal, Wifi.
Fig. 1 gives a kind of applied environment of above-mentioned transmission method: be applied to base station 101 be similar to access terminal 102, access terminal 104 the terminal communication of arbitrary number.
Access terminal 102 and 104 can be such as cell phone, smart phone, portable computer, handheld communication devices, handheld computing device, satellite radio, global positioning system, PDA and/or other applicable equipment arbitrarily.
Before address, plan in the industry to increase a kind of listem-before-talk (ListenBeforeTalk, LBT) mechanism in LTE.Like this, if LTE detects channel busy in unlicensed spectrum, then can not take this frequency range, if detect that channel is not busy, just can take.
And in order to send DRS in current unlicensed spectrum, also need to carry out LBT mechanism.DRS can be used for realizing the functions such as RRM measurement, down-going synchronous, time-frequency estimation, it is the same that DRS each sends position at the character position that each subframe takies, and take the multiple symbol of continuous print (because discontinuous words, channel may be snatched away by other sending point in break period).DRS can in subframe 0, and other subframes beyond 5 send.
Aforementioned known, the DMTC of DRS periodically occurs, the minimum period is the length of 40ms, DMTC is 6ms.DRS has maximum 6 can send position in the middle of 6ms.Each send position before to carry out LBT mechanism, only have LBT detect channel idle could send.
If the DMTC time runs into the PDSCH transmission time period, will be how?
Fig. 2 shows a kind of scene of PDSCH and DMTC phase " collision ": after the LBT mechanism success of PDSCH, base station can send PDSCH data by busy channel, just, this Channel holding time and DMTC time overlap, and comprise the sent position of 3 DRS in the overlapping time.
It should be noted that, the LBT mechanism that LBT mechanism and the PDSCH of DRS send also is different, and DRS more easily can rob and account for channel.
If then PDSCH and DMTC phase " collision ", there are two kinds of situations at present: when one is DRS transmission, PDSCH does not send (also namely DRS sends separately); Another kind is that DRS and PDSCH sends simultaneously.
The solution that following examples of the present invention will introduce DRS and PDSCH and send simultaneously.
Refer to Fig. 3, a kind of schematic flow sheet that Fig. 3 shows " transmission method of the LTE in unlicensed spectrum ", it at least comprises the steps:
S301: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
How referring to hereinbefore description based on the LBT mechanism monitoring for sending PDSCH, therefore not to repeat here.
S302: listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time (sending the Channel holding time of PDSCH in unlicensed spectrum), and comprise one or more DRS in the time of overlap when can send position, the same subframe in above-mentioned Channel holding time sends DRS and PDSCH simultaneously.Wherein, above-mentioned same subframe comprises DRS and can send position.
Still for scene shown in Fig. 2: the Channel holding time and the DMTC time that send PDSCH in unlicensed spectrum overlap, and, comprise the sent position of 3 DRS in the overlapping time, can be called respectively the 1st can send position, the 2nd can send position, the 3rd can send position.
Assuming that, subframe 6 comprises above-mentioned 1st can send position, subframe 7 comprises above-mentioned 2nd can send position, and subframe 8 comprises above-mentioned 3rd can send position, then in the present embodiment, can in subframe 6, or subframe 7, or subframe 8, or subframe 6 and 7, or subframe 7 and 8, or subframe 6,7,8 sends DRS and PDSCH simultaneously.
Mainly see where PSS and SSS in DRS sends, such as, PSS and SSS can send in subframe 6, and the 7th, 8 subframes can send the traditional CRS of LTE, these CRS are also parts of DRS.
Therefore, the present invention's alleged " same subframe ", be not defined as DRS only to send together with PDSCH in some subframes, DRS can send in the multiple subframes in overlapping time together with PDSCH, and the subframe of each carrying DRS and PDSCH is the same subframe alleged by the present invention.
And the present invention's alleged " simultaneously sending ", should be understood to, in same subframe, transmission is and sends simultaneously.
Implement embodiments of the invention, can realize in unlicensed spectrum, DRS and PDSCH sends simultaneously, brings better broadband experience, higher speed, better stability and mobile facility, better can coexist simultaneously with WiFi to user.
Fig. 4 shows another schematic flow sheet of " transmission method of the LTE in unlicensed spectrum " that other embodiments of the invention provide, and it can comprise the steps:
S401: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle.
This step is identical with S301, repeats no more.
S402: listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, the transmission period of configuration DRS, to make the same subframe of DRS and PDSCH in above-mentioned Channel holding time sends simultaneously.
DRS transmission period is the time interval of preset length, for sending DRS to be transmitted.Transmission period can be positioned at same subframe, or crosses over several subframe.
Continue to use previous example, assuming that comprise the sent position of 3 DRS in the overlapping time---the 1st can send position, the 2nd can send position, the 3rd can send position.Meanwhile, subframe 6 comprises above-mentioned 1st can send position, and subframe 7 comprises above-mentioned 2nd can send position, and subframe 8 comprises above-mentioned 3rd can send position
Then in this step of the present embodiment, be configurable on subframe 6, or subframe 7, or subframe 8, or subframe 6 and 7, or subframe 7 and 8, or (DRS) in subframe 6,7,8 can send on position and send DRS, above-mentioned subframe 6,7,8 also will carry PDSCH simultaneously.Then the same subframe of follow-up DRS and the PDSCH of realization in (unlicensed spectrum sends PDSCH's) Channel holding time sends simultaneously.
S403: the same subframe in above-mentioned Channel holding time sends above-mentioned DRS and PDSCH simultaneously.
Wherein, above-mentioned same subframe comprises DRS can send position, and above-mentioned Channel holding time is the Channel holding time sending PDSCH in above-mentioned unlicensed spectrum.
More specifically, step S403 also can be refined as: according to the transmission period of DRS of configuration, and the same subframe of DRS and PDSCH in above-mentioned Channel holding time sends simultaneously.
The aforementioned DRS of being referred to also has LBT mechanism, and accordingly, in other embodiments of the present invention, the transmission method in above-mentioned all embodiments also can comprise the steps:
Unlicensed spectrum is carried out the LBT Channel Detection of DRS.
More specifically, will carry out LBT mechanism before each DRS can send position, only having LBT to detect channel idle could send DRS.
It should be noted that, in actual scene, the transmission time of PDSCH data can take multiple subframe, and its duration may be greater than the duration that DRS transmits.Therefore, if the DMTC time of the Channel holding time of PDSCH and DRS overlaps, then in overlapping time, unauthorized band channels is idle condition.
In other embodiments of the present invention, when the Channel holding time of this PDSCH and the DMTC time of DRS overlap, the LBT that can not perform DRS when sending DRS within the time of this overlap detects.
More specifically, before each DRS within above-mentioned overlapping time can send position, the LBT that can not carry out DRS detects.
For ease of understanding, now LTE technology and DRS are further introduced.
Refer to Fig. 5, LTE frame (being also a radio frames) length is 10ms, and a LTE frame comprises 10 subframes, and each subframe is long is 1ms; Each subframe comprises two time slots (slot), and each time slot comprises 7 symbols (symbol), and namely 1 subframe comprises 14 symbols.
LTE system carries out Resourse Distribute by distributing RB (ResourceBlock, Resource Block).Still refer to Fig. 5, each RB is one piece of resource, and it comprises the time-domain resource of a Time Slot Occupancy in time, and frequency comprises the resource of 12 sub-carrier occupancies.And the resource of a sub-carrier occupancy in an OFDM symbol is called RE (ResourceElement).Under normal CP pattern, 1 RB=12*7 RE.
As for DRS, it can comprise polytype downlink reference signal, such as, in PSS, SSS, CRS and CSI-RS one or more.In prior art designs, when in unlicensed spectrum, DRS sends separately, the length of each DRS is no more than 1ms.
Wherein, PSS (PrimarySynchronizationSignal, master sync signal) frequency domain accounts for system bandwidth 6 RB and 72sc (subcarrier), SSS (SecondarySynchronizationSignal, auxiliary synchronous signals) also takies 6 RB on frequency domain.
Aforementionedly to mention, if PDSCH and DMTC phase " collision ", can when DRS send, PDSCH does not send (follow-up referred to as DRSonly herein), also can send by DRS and PDSCH simultaneously.
In the present invention, to the design of DRS when DRS and PDSCH sends together, can be the same to the design of DRS with during DRSonly, both designs also can be made different.
When first introduction design is the same, how to configure the transmission period of DRS herein.
To the design of DRS when DRS and PDSCH sends together, with time the same to the design of DRS during DRSonly, the length of DRS is less than 1ms, and PSS, SSS etc. that DRS comprises send a subframe inside.
Refer to Fig. 6, when designing the same, the transmission method of the LTE in unlicensed spectrum can comprise the steps:
S601: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle.
This step is identical with S401, repeats no more.
S602: listening to channel idle, and overlaps with the DMTC time of DRS in this Channel holding time, and comprise a DRS in the time of overlap when can send position, configuration DRS can send on position send at this.
This means, the aforesaid step transmission period of DRS " configuration " can comprise in refinement: in Channel holding time, only comprise a DRS when can send position, and configuration DRS can send on position send at this.
Refer to Fig. 7, assuming that only comprise a DRS in the overlapping time can send position, this can send position and be contained in subframe 9, then in this step of the present embodiment, (DRS) that be configurable on subframe 9 can send on position and send DRS, and above-mentioned subframe 9 also will carry PDSCH simultaneously.Then follow-up DRS and the PDSCH of realization sends in subframe 9 simultaneously.
When designing the same with DRSonly, the length of DRS is less than 1ms, therefore, further, also can configure as follows: on the time period shared by DRS, the unappropriated running time-frequency resource of DRS fills PDSCH.
For example, refer to Fig. 9 a, assuming that DRS comprises PSS and SSS, DRS takies subframe 5-8 symbol, and the PSS that DRS comprises takies the 7th symbol, and SSS takies the 6th symbol, and PSS and SSS only takies middle 6RB.The CRS that DRS comprises takies the 5th symbol and the 8th symbol.Bandwidth beyond the middle 6RB of so the 6th symbol and the 7th symbol can fill PDSCH.
S603: the same subframe in above-mentioned Channel holding time sends above-mentioned DRS and PDSCH simultaneously.
This step is identical with S403, repeats no more.
And if comprise multiple DRS in Channel holding time and can send position, then a kind of schematic flow sheet that can be shown in Figure 8, it can comprise the steps:
S801: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle.
This step is identical with S601, repeats no more.
S802: listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise multiple DRS in the time of overlap when can send position, configuration DRS can send position at first DRS and send, or configuration DRS in the end DRS can send position and sends, if or there is the DRS taking subframe 0 or 5 when can send position, configuration DRS can send on position send at this.
This means, aforesaid step " transmission period of configuration DRS " can comprise in refinement:
In Channel holding time, comprise multiple DRS when can send position, configuration DRS can send position at first DRS and send, or,
A configuration DRS in the end DRS can send position transmission, or,
If there is the DRS taking subframe 0 or 5 when can send position, configuration DRS can send on position send at this.
For example, still refer to Fig. 2, assuming that comprise subframe 6,7,8 in the overlapping time, and subframe 6 the 1st of comprising in DMTC can send position, and subframe 7 the 2nd of comprising in DMTC can send position, and subframe 8 the 3rd of comprising in DMTC can send position.
Then in this step of the present embodiment, configurable DRS can send position (the sent position of subframe 6) at first DRS and send, or configuration DRS in the end DRS can send position (the sent position of subframe 8) and send.
And if comprise subframe 4,5,6 in the time of overlap, and, subframe 4 the 1st of comprising in DMTC can send position, subframe 5 the 2nd of comprising in DMTC can send position, subframe 6 the 3rd of comprising in DMTC can send position, now, there is the DRS taking subframe 5 can send position, then configure DRS and send on the sent position of subframe 5.
Also namely, if there is the DRS taking subframe 0 or 5 when can send position, preferential configuration DRS can send on position send at this.
S803: the same subframe in above-mentioned Channel holding time sends above-mentioned DRS and PDSCH simultaneously.
This step is identical with S803, repeats no more.
In other embodiments of the present invention, " transmission period of configuration DRS " in above-mentioned all embodiments also can comprise the steps:
Time period shared by DRS the unappropriated running time-frequency resource of DRS is filled at least one in PSS, SSS, CRS (Cellspecificrefersignal) and CSI-RS (Channelstateinformation-referencesignal).
When designing the same with DRSonly, the length of DRS is less than 1ms, and fill on the unappropriated running time-frequency resource of DRS PSS and or SSS and or downlink reference signal (in CRS or CSI-RS one or more), the demand sending and take 80% bandwidth continuously can be realized.
For example, refer to Fig. 9 b, assuming that DRS comprises PSS and SSS, DRS takies subframe 5-8 symbol, and the PSS that DRS comprises takies the 7th symbol, and SSS takies the 6th symbol, and PSS and SSS only takies middle 6RB.The CRS that DRS comprises takies the 5th symbol and the 8th symbol.Bandwidth beyond the middle 6RB of so the 6th symbol and the 7th symbol can fill existing RS (at least one in PSS, SSS, CRS and CSI-RS) sequence, also can fill new downlink reference signal.
To introduce below, to the design of DRS when DRS and PDSCH sends together, with time different to the design of DRS during DRSonly, how design DRS, and the transmission period of configuration DRS.
When designing different, when DRS and PDSCH sends together, DRS can be designed to length and be not more than 5ms, shared symbol quantity is no less than 4.DRS at least comprises PSS, SSS, CRS and configurable CSI-RS.
Also namely, different with DRSonly, DRS length here can be greater than 1ms, and certainly, in some cases, the length of DRS also can be less than 1ms (this paper is follow-up will be introduced).
When DRS length is greater than 1ms, DRS will take multiple subframe and send.The transmission period then configuring DRS can specifically comprise:
PSS and SSS that comprise of configuration DRS only sends in a subframe, meanwhile, and the 6th symbol that PSS takies the 7th symbol of this subframe, SSS takies this subframe, and only take the bandwidth of middle 6RB;
The unappropriated running time-frequency resource of other DRS being configured in the subframe sending PSS, SSS fills PDSCH, " the unappropriated running time-frequency resource of other DRS " time period shared by DRS upper unappropriated running time-frequency resource of DRS should be specially.
For example, refer to Figure 10, assuming that DRS takies these 4 symbols of 5-8, wherein, the PSS that DRS comprises takies the 7th symbol, and SSS takies the 6th symbol, and CRS takies the 5th symbol and the 8th symbol, because PSS and SSS only takies the middle 6RB of the 7th symbol and the 6th symbol, then other RB of the 7th symbol and the 6th symbol can fill PDSCH.
As for other downlink reference signals that DRS comprises, such as CRS, CSI-RS, then can send in multiple subframe, need not carry out new design to it.
When Figure 11 shows and designs different with DRSonly, the another kind of schematic flow sheet of the transmission method of the LTE in unlicensed spectrum, it can comprise the steps:
S1101: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle.This step is identical with S801, repeats no more.
S1102: listening to channel idle, and, overlaps with the DMTC time of DRS in this Channel holding time, and when comprising the sent position of PSS and SSS that multiple DRS comprises in the time of overlap, the length of configuration DRS is greater than 1ms;
It should be noted that, because CRS, CSI-RS can send in the subframe not having PSS/SSS to send, therefore, the DRS in the present embodiment can send the sent position that position is specially PSS and SSS that DRS comprises.Distinguish for position can be sent with the DRS in previous embodiment, " DRS can send position " can be called that first can send position, " the sent position of PSS and SSS that DRS comprises " is called that second can send position.
S1103: configure PSS and SSS that this DRS comprises and can send position at first and send, or, configure PSS and SSS that this DRS comprises in the end one can send position and send, or, when PSS and SSS that comprise of DRS taking subframe 0 or 5 if exist can send position, configure this DRS and can send on position send at this.
Illustrate below: assuming that comprise subframe 6,7,8 in the overlapping time, and subframe 6 comprises the 1st second can send position, and subframe 7 comprises the 2nd second can send position, and subframe 8 comprises the 3rd second can send position.
Then in this step of the present embodiment, PSS and SSS that configurable DRS comprises can send position (second of subframe 6 can send position) at the 1st second and send, PSS and SSS that also configurable DRS comprises can send position (second of subframe 8 can send position) at the 3rd second and send.
And if comprise subframe 4,5,6 in the time of overlap, and, subframe 4 comprises the 1st second can send position, subframe 5 comprises the 2nd second can send position, subframe 6 comprises the 3rd second can send position, now, existence takies second of subframe 5 and can send position, then PSS and SSS that configuration DRS comprises can send on position in second of subframe 5 and send.
Also namely, take second of subframe 0 or 5 when can send position if exist, PSS and SSS that preferential configuration DRS comprises second can send on position at this and send.
S1104: at least one configured in CRS and CSI-RS in above-mentioned DRS takies the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
More specifically, under 2TX transmit port, CRS can take the 1st, 5,8,12 symbol; Under 4TX transmit port, CRS can take the 1st, 2,5,8,9,12 symbol.
CSI-RS can take the 10th, 11 symbol, and the part RE on the 6th, 7,13,14 symbol.
Refer to Figure 12 and Figure 13, assuming that DRS takies subframe 6 and subframe 7, wherein, the PSS that DRS comprises takies the 7th symbol of subframe 6, SSS takies the 6th symbol of subframe 6, and only take middle 6RB, then the bandwidth in DRS beyond the 6th symbol of the unappropriated subframe of PSS and SSS 6 and the middle 6RB at the 7th symbol place can fill PDSCH.
And for subframe 7, its 6th, 7 whole bandwidth of symbol all fills PDSCH.
S1105: the same subframe in above-mentioned Channel holding time sends above-mentioned DRS and PDSCH simultaneously.
This step is identical with S803, repeats no more.
When Figure 14 shows and designs different with DRSonly, another schematic flow sheet of the transmission method of the LTE in unlicensed spectrum, it can comprise the steps:
S1401: whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle.
This step is identical with S1101, repeats no more.
S1402: listening to channel idle, and, overlaps with the DMTC time of DRS in this Channel holding time, and when only comprising the sent position of PSS and SSS that a DRS comprises in the time of overlap, PSS and SSS that configuration DRS comprises can send on position send at this.
In the present embodiment, DRS adopts the length being shorter than 1ms to send.DRS can take 5-8 symbol of subframe or take subframe 1-12 symbol.
In 5-8 symbol shared by DRS or 1-12 symbol, the PSS in this DRS takies the 7th symbol, and the SSS in this DRS takies the 6th symbol.Therefore, in the present embodiment, the sent position of the PSS/SSS that DRS comprises is exactly the 7th of certain subframe the, 6 symbol.
S1403: at least one configuration in CRS and CSI-RS in DRS takies the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
More specifically, under 2TX transmit port, CRS can take the 1st, 5,8,12 symbol; Under 4TX transmit port, CRS can take the 1st, 2,5,8,9,12 symbol.
CSI-RS can take the 10th, 11 symbol, and the part RE on the 6th, 7,13,14 symbol.
S1404: the same subframe in above-mentioned Channel holding time sends above-mentioned DRS and PDSCH simultaneously.
This step is identical with S1105, repeats no more.
It should be noted that, in existing LTE protocol, regulation PSS, SSS take the 6th, 7 symbol of subframe 0 or 5, and the 6th, 7 symbol of other subframes can be used for sending PDSCH.And in the present invention, PSS, SSS can the subframe outside subframe 0,5 send, take the in other subframes outside subframe 0,5 the 7th, 6 symbols.
In other embodiments of the present invention, the transmission method that above-mentioned all embodiments provide also can comprise the steps:
As the PSS/SSS that configuration DRS or configuration DRS comprises, when the subframe outside subframe 0 and 5 sends, different SSS sequences or scrambler in subframeindex (subframe numbering), is adopted to indicate different subframes.
Tradition SSS has two kinds of sequences to distinguish subframe 0 and 5.Due in the present invention, the subframe that the PSS/SSS that DRS comprises may take is not limited to subframe 0 and 5, but can send on subframe 0-9, then 10 kinds of different SSS sequences can be used to distinguish instruction subframe 0-9.
In like manner, instruction subframe 0-9 can be distinguished with 10 kinds of different scramblers.
In other embodiments of the present invention, the method that above-mentioned all embodiments provide also can comprise the steps:
As configuration DRS or the PSS/SSS that comprises of configuration DRS, when the subframe outside subframe 0 and 5 sends, the difference of any one or combination in any filling mode is adopted in PSS, SSS, CRS and CSI-RS to indicate different subframes.
More specifically, can adopt and the unappropriated running time-frequency resource on the time period shared by PSS and SSS comprised at DRS fill at least one in PSS, SSS, CRS and CSI-RS to indicate different subframes.
Concrete, any one or combination in any can be filled in PSS, SSS, CRS and CSI-RS to indicate different subframes in the vacant bandwidth of PSS/SSS.
For example, SSS has had 2 kinds of sequences, so can SSS sequence 1, subframe 5-9 be used to use SSS sequence 2 by subframe 0-4.And filling mode mainly considers those RE in the unappropriated bandwidth of PSS/SSS.Such as in vacant bandwidth, full packing PSS represents subframe 1, and full packing SSS indicates subframe 2, and full packing CRS indicates subframe 3, and full packing CSI-RS indicates subframe 4.
Also combination can be filled, such as, the vacant bandwidth of the 6th symbol is filled PSS to indicate and the vacant bandwidth of subframe the 6,7th symbol fills SSS indicate subframe 7, or the vacant bandwidth of the 6th symbol is filled CRS to indicate and the vacant bandwidth of subframe the 8,7th symbol fills SSS indicate subframe 9.The combination that can carry out is very many, and this is no longer going to repeat them.
In other embodiments of the present invention, the method in above-mentioned all embodiments also can comprise:
Send the time-frequency location that RRC signaling instruction DRS takies;
Whether send in DCI signaling indicating user present sub-frame has DRS to send.
In other embodiments of the present invention, in present sub-frame, have DRS to send and the DRS design of DRSonly and DRS and PDSCH when simultaneously sending is different time, above-mentioned DCI signaling also can be used for the kind of design of instruction DRS.The kind of design of DRS comprises DRSonly type and DRS and PDSCH transmission types simultaneously.
More specifically, when the DRS design when DRSonly sends with DRS and PDSCH is simultaneously the same, can adopts in above-mentioned DCI signaling in 1bit data indicating user present sub-frame and whether have DRS to send.
Further, above-mentioned 1 Bit data value can be 0 or 1: ' 0 ' indicates in the RB that this user is assigned to and do not have DRS to send in this subframe, but the PDSCH sent; ' 1 ' indicates in the RB that this user is assigned to and has DRS to send in this subframe, does not have PDSCH, need get around during receipt decoding.
And when DRSonly and DRS and PDSCH sends simultaneously DRS design different time, the kind of design of DRS when whether above-mentioned DCI signaling needs 2bit to have DRS send and have DRS to send to indicate in present sub-frame: such as " 00 " instruction does not have DRS to send, " 01 " instruction has DRS to send and uses the kind of design of DRSonly, and " 10 " instruction has DRS to send and uses the kind of design that DRS and PDSCH sends simultaneously.
As for the time-frequency location of at least one the taken LTE system regulation in CRS and CSI-RS, the no longer special otherwise designed signaling instruction of the present invention CRS and CSI-RS.
In addition, it should be noted that, RRC instruction sent before transmission DRS and PDSCH, and DCI together can send with DRS, PDSCH.
RRC signaling can the time-frequency location that takies of indicating user DRS: such as in DRS transmission situation separately, it can indicate DRS to take which symbol, which RB; In DRS and PDSCH transmission situation simultaneously, RRC can indicate when 1 subframe sends or multiple continuous print subframe sends simultaneously simultaneously, and DRS takies which RB of which symbol.
After user knows the time-frequency location that DRS takies, being just aware of the time-frequency location place that DRS takies does not have the data of PDSCH to send, so just get around these time-frequency location during decoding.
Above-described embodiment is the transmission method that base station side performs, and will introduce the transmission method of subscriber terminal side below.
Refer to Figure 15, the transmission method of the LTE in the unlicensed spectrum that subscriber terminal side performs can comprise:
S1501: be received in the data that unlicensed spectrum is transmitted;
Above-mentioned packet contains, DRS and the PDSCH that same subframe sends simultaneously;
S1502: to above-mentioned decoding data;
Wherein, DRS and PDSCH is base station side listens in unlicensed spectrum channel idle based on the LBT mechanism for sending PDSCH, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in above-mentioned Channel holding time sends simultaneously, and above-mentioned same subframe comprises DRS can send position.
Detail refers to foregoing description herein, and therefore not to repeat here.
In other embodiments of the present invention, the method performed by user terminal also can comprise the steps:
Receive the RRC of the time-frequency location that the above-mentioned DRS of instruction takies;
Receive the DCI signaling whether having DRS to send in indicating user present sub-frame.
In other embodiments of the present invention, in present sub-frame, have DRS to send and the DRS design of DRSonly and DRS and PDSCH when simultaneously sending is different time, above-mentioned DCI signaling also can be used for the kind of design of instruction DRS.Kind of design can comprise the independent transmission types of DRS, and DRS and PDSCH is transmission types simultaneously.
Wherein, RRC instruction sent before transmission DRS and PDSCH, and DCI together can send with DRS, PDSCH.Also namely, the data transmitted in unlicensed spectrum under receiving in step S1501 may comprise above-mentioned DCI signaling.
More specifically, when the DRS design when DRSonly sends with DRS and PDSCH is simultaneously the same, can adopts in above-mentioned DCI signaling in 1bit data indicating user present sub-frame and whether have DRS to send.
And when DRSonly and DRS and PDSCH sends simultaneously DRS design different time, need 2bit to indicate, such as " 00 " instruction does not have DRS to send, " 01 " instruction has DRS to send and uses the kind of design of DRSonly, and " 10 " instruction has DRS to send and uses the kind of design that DRS and PDSCH sends simultaneously.
As for the time-frequency location of at least one the taken LTE system regulation in CRS and CSI-RS, the no longer special otherwise designed signaling instruction of the present invention CRS and CSI-RS.
RRC signaling can the time-frequency location that takies of indicating user DRS: such as in DRS transmission situation separately, it can indicate DRS to take which symbol, which RB; In DRS and PDSCH transmission situation simultaneously, RRC can indicate when 1 subframe sends or multiple continuous print subframe sends simultaneously simultaneously, and DRS takies which RB of which symbol.
In other embodiments of the present invention, if to the design of DRS when DRS and PDSCH sends together, the same to the design of DRS when sending separately with DRS, above-mentioned decoded data step can specifically comprise:
According to the instruction of above-mentioned RRC and DCI, determine whether the time-frequency location that DRS takies and present sub-frame have DRS to send; And when determining that present sub-frame has DRS to send, the data on the time-frequency location take above-mentioned DRS are not decoded.
If to the design of DRS when DRS and PDSCH sends together, different to the design of DRS when sending separately with DRS, above-mentioned decoded data step can specifically comprise:
According to the instruction of above-mentioned RRC and DCI, determine time-frequency location that DRS takies, whether present sub-frame have DRS to send, and when present sub-frame has DRS to send the kind of design of DRS; And when determining that present sub-frame has DRS to send, the data on the time-frequency location taken above-mentioned DRS according to the kind of design of DRS are not decoded.
Certainly, for foregoing description, filled the situation of the unappropriated running time-frequency resource on the time period shared by DRS by PDSCH, according to RRC signaling, user also knows where PDSCH has been filled in running time-frequency resource shared by DRS, needs to decode to this part PDSCH data user.
After having introduced method, the transmitting device of LTE that will introduce in unlicensed spectrum of following embodiment herein, transmitting device is for having performed above-mentioned transmission method.
More specifically, transmitting device can be used as base station or accesses terminal.
When being used as base station, refer to Figure 16, transmitting device 1600 can comprise following structure first monitoring unit 1601, transmitting element 1602, wherein:
First monitoring unit 1601 for, whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH idle;
Transmitting element 1602 for, listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, the same subframe in above-mentioned Channel holding time sends simultaneously and the above-mentioned same subframe of above-mentioned DRS and PDSCH comprises DRS can send position.
Wherein, above-mentioned Channel holding time is the Channel holding time sending PDSCH in above-mentioned unlicensed spectrum.Detail refers to foregoing description herein, does not repeat them here.
In other embodiments of the present invention, still refer to Figure 16, the device 1600 in above-mentioned all embodiments also can comprise:
Dispensing unit 1603 for, before the first transmitting element 1601 sends DRS and PDSCH simultaneously, configuration DRS transmission period, to make the same subframe of this DRS and PDSCH in above-mentioned Channel holding time sends simultaneously.
DRS transmission period is the time interval of preset length, for sending DRS to be transmitted.Transmission period can be positioned at same subframe, or crosses over several subframe.
Accordingly, transmitting element 1602 can be specifically for, according to the transmission period of the DRS of configuration, the same subframe of DRS and PDSCH in above-mentioned Channel holding time sends simultaneously.
In other embodiments of the present invention, the device in above-mentioned all embodiments, also can comprise: the second monitoring unit, for carrying out the LBT Channel Detection of DRS in unlicensed spectrum.
In actual scene, the transmission time of PDSCH data can take multiple subframe, and its duration may be greater than the duration that DRS transmits.Therefore, if the DMTC time of the Channel holding time of PDSCH and DRS overlaps, then in overlapping time, unauthorized band channels is idle condition.Therefore, in other embodiments of the present invention, when the Channel holding time of this PDSCH and the DMTC time of DRS overlap, the LBT that can not perform DRS when above-mentioned second monitoring unit sends DRS within the time of overlap detects.
Particular content is see the description of preceding method part, and therefore not to repeat here.
Aforementionedly to mention, if PDSCH and DMTC phase " collision ", can when DRS send, PDSCH does not send (follow-up referred to as DRSonly herein), also can send by DRS and PDSCH simultaneously.
In the present invention, to the design of DRS when DRS and PDSCH sends together, can be the same to the design of DRS with during DRSonly, both designs also can be made different.
When first introduction design is the same, how to configure the transmission period of DRS herein.
When designing the same, in the transmission period of the above-mentioned DRS of above-mentioned configuration, above-mentioned dispensing unit 1603 can be specifically for:
In above-mentioned Channel holding time, only comprise a DRS when can send position, configure above-mentioned DRS and can send on position send at this.
Detail is see above, and therefore not to repeat here.
And if comprise multiple DRS in Channel holding time and can send position, then the above-mentioned DRS of above-mentioned configuration transmission period in, above-mentioned dispensing unit 1603 can be specifically for:
Configure above-mentioned DRS and can send position transmission at first DRS, or,
Configure above-mentioned DRS in the end DRS can send position and send, or,
If there is the DRS taking subframe 0 or 5 when can send position, configure above-mentioned DRS and can send on position send at this.
Sent position in the present embodiment refers to DRS can send position.
Detail is as detailed above, does not repeat.
The length of above-mentioned DRS is less than 1ms, and for realizing the demand sending and take 80% bandwidth continuously, in the transmission period of the above-mentioned DRS of above-mentioned configuration, above-mentioned dispensing unit 1603 also can be used for:
Time period shared by above-mentioned DRS the unappropriated running time-frequency resource of DRS is filled PSS and or SSS and or CRS and or CSI-RS.
Detail is see above, and therefore not to repeat here.
To introduce below, to the design of DRS when DRS and PDSCH sends together, with time different to the design of DRS during DRSonly, how design DRS, and the transmission period of configuration DRS.
In embodiments of the present invention, when DRS and PDSCH sends together, DRS can be designed to length and be not more than 5ms, shared symbol quantity is no less than 4.DRS at least comprises PSS, SSS, CRS and configurable CSI-RS.
Also namely, different with DRSonly, DRS length here can be greater than 1ms, and certainly, in some cases, the length of DRS also can be less than 1ms (this paper is follow-up will be introduced).
When DRS length is greater than 1ms, DRS will take multiple subframe and send.Based on this kind of situation, in other embodiments of the present invention, the above-mentioned DRS of above-mentioned configuration transmission period in, the dispensing unit 1603 in above-mentioned all embodiments can be specifically for:
When DRS length is greater than 1ms, configures PSS and SSS that above-mentioned DRS comprises and only send in a subframe, meanwhile, the 6th symbol that PSS takies the 7th symbol of this subframe, SSS takies this subframe, and only take the bandwidth of middle 6RB;
The unappropriated running time-frequency resource of other DRS being configured in the subframe sending above-mentioned PSS, SSS is filled
PDSCH。Wherein, " the unappropriated running time-frequency resource of other DRS " is the unappropriated running time-frequency resource of this DRS on the time period shared by DRS.
Detail is as detailed above, and therefore not to repeat here.
When comprising the sent position of PSS and SSS that multiple DRS comprises in above-mentioned Channel holding time, in other embodiments of the present invention, the above-mentioned DRS of above-mentioned configuration transmission period in, the dispensing unit 1603 in above-mentioned all embodiments can be specifically for:
The length configuring above-mentioned DRS is greater than 1ms;
Configure PSS and SSS that DRS that above-mentioned length is greater than 1ms comprises can send position at first and send, or,
Configure PSS and SSS that DRS that above-mentioned length is greater than 1ms comprises in the end one can send position and send, or,
When PSS and SSS that comprise of DRS taking subframe 0 or 5 if exist can send position, configure DRS that above-mentioned length is greater than 1ms and can send on position send at this.
Wherein, at least one in CRS and CSI-RS in above-mentioned DRS takies the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
Detail is as detailed above, and therefore not to repeat here.
When only comprising the sent position of PSS and SSS that a DRS comprises in above-mentioned Channel holding time, in other embodiments of the present invention, the above-mentioned DRS of above-mentioned configuration transmission period in, the dispensing unit 1603 in above-mentioned all embodiments can be specifically for:
Configure PSS and SSS that above-mentioned DRS comprises can send on position send at this;
Wherein, the CRS in above-mentioned DRS and or CSI-RS take the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
Detail is as detailed above, and therefore not to repeat here.
In other embodiments of the present invention, refer to Figure 17, the device in above-mentioned all embodiments also can comprise as lower component:
First indicating member 1701 for, when configure the subframe of PSS and SSS that comprise of DRS or DRS outside subframe 0 and 5 sends time, in subframeindex, adopt different SSS sequences or scrambler to indicate different subframes.
Detail is as detailed above, and therefore not to repeat here.
In other embodiments of the present invention, still refer to Figure 17, the device in above-mentioned all embodiments also can comprise as lower component:
Second indicating member 1702, for when configure the subframe of PSS and SSS that comprise of above-mentioned DRS or above-mentioned DRS outside subframe 0 and 5 sends time, adopt the difference of PSS, SSS, CRS and CSI-RS filling mode to indicate different subframes.
Detail is as detailed above, and therefore not to repeat here.
In order to notify user, in other embodiments of the present invention, the transmitting element 1602 in above-mentioned all embodiments also can be used for:
Send the time-frequency location that RRC signaling instruction DRS takies;
Whether send in DCI signaling indicating user present sub-frame has DRS to send.
Wherein, RRC instruction sent before transmission DRS and PDSCH, and DCI together can send with DRS, PDSCH.
RRC signaling can the time-frequency location that takies of indicating user DRS: such as in DRS transmission situation separately, it can indicate DRS to take which symbol, which RB; In DRS and PDSCH transmission situation simultaneously, RRC can indicate when 1 subframe sends or multiple continuous print subframe sends simultaneously simultaneously, and DRS takies which RB of which symbol.
After user knows the time-frequency location that DRS takies, being just aware of the time-frequency location place that DRS takies does not have the data of PDSCH to send, so just get around these time-frequency location during decoding.
In other embodiments of the present invention, in present sub-frame, have DRS to send and the DRS design of DRSonly and DRS and PDSCH when simultaneously sending is different time, above-mentioned DCI signaling also can be used for the kind of design of instruction DRS.The kind of design of DRS comprises DRSonly type and DRS and PDSCH transmission types simultaneously.
More specifically, when DRS design when DRSonly sends with DRS and PDSCH is simultaneously the same, can adopts in above-mentioned DCI signaling in 1bit data indicating user present sub-frame and whether have DRS to send.
And when DRSonly and DRS and PDSCH sends simultaneously DRS design different time, the kind of design of DRS when whether above-mentioned DCI signaling needs 2bit to have DRS send and have DRS to send to indicate in present sub-frame: such as " 00 " instruction does not have DRS to send, " 01 " instruction has DRS to send and uses the kind of design of DRSonly, and " 10 " instruction has DRS to send and uses the kind of design that DRS and PDSCH sends simultaneously.
Detail is as detailed above, and therefore not to repeat here.
Transmitting device as subscriber equipment will be introduced below.Refer to Figure 18, when as subscriber equipment, the transmitting device 1800 of the LTE in unlicensed spectrum can comprise:
Receiving element 1801 for, be received in the data that unlicensed spectrum is transmitted;
Above-mentioned data are included in DRS and the PDSCH that same subframe sends simultaneously.
Decoding unit 1802 for, to above-mentioned decoding data;
Wherein, DRS and PDSCH is base station side listens in unlicensed spectrum channel idle based on the LBT mechanism for sending PDSCH, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in above-mentioned Channel holding time sends simultaneously, above-mentioned same subframe comprises DRS and can send position, above-mentioned Channel holding time is the Channel holding time sending PDSCH in above-mentioned unlicensed spectrum.
Detail refers to foregoing description herein, and therefore not to repeat here.
In other embodiments of the present invention, the receiving element 1801 in above-mentioned all embodiments also can be used for:
Receive the RRC of the time-frequency location that instruction DRS takies;
Receive the DCI signaling whether having DRS to send in indicating user present sub-frame.
Wherein, RRC instruction sent before transmission DRS and PDSCH, and DCI together can send with DRS, PDSCH.Also namely, the data transmitted in unlicensed spectrum under receiving may comprise above-mentioned DCI signaling.
In other embodiments of the present invention, in present sub-frame, have DRS to send and the DRS design of DRSonly and DRS and PDSCH when simultaneously sending is different time, above-mentioned DCI signaling also can be used for the kind of design of instruction DRS.Kind of design can comprise the independent transmission types of DRS, and DRS and PDSCH is transmission types simultaneously.
More specifically, when the DRS design when DRSonly sends with DRS and PDSCH is simultaneously the same, can adopts in above-mentioned DCI signaling in 1bit data indicating user present sub-frame and whether have DRS to send.
And when DRSonly and DRS and PDSCH sends simultaneously DRS design different time, need 2bit to indicate, such as " 00 " instruction does not have DRS to send, " 01 " instruction has DRS to send and uses the kind of design of DRSonly, and " 10 " instruction has DRS to send and uses the kind of design that DRS and PDSCH sends simultaneously.
As for the time-frequency location of at least one the taken LTE system regulation in CRS and CSI-RS, the no longer special otherwise designed signaling instruction of the present invention CRS and CSI-RS.
In other embodiments of the present invention, if to the design of DRS when DRS and PDSCH sends together, the same to the design of DRS when sending separately with DRS, in decoded data, the decoding unit 1802 in above-mentioned all embodiments can be specifically for:
According to the instruction of above-mentioned RRC and DCI, determine whether the time-frequency location that DRS takies and present sub-frame have DRS to send; And when determining that present sub-frame has DRS to send, the data on the time-frequency location take above-mentioned DRS are not decoded.
In other embodiments of the present invention, if to the design of DRS when DRS and PDSCH sends together, different to the design of DRS when sending separately with DRS, in decoded data, the decoding unit 1802 in above-mentioned all embodiments can be specifically for:
According to the instruction of above-mentioned RRC and DCI, determine time-frequency location that DRS takies, whether present sub-frame have DRS to send, and when present sub-frame has DRS to send the kind of design of DRS;
When determining that present sub-frame has DRS to send, the data on the time-frequency location taken above-mentioned DRS according to the kind of design of DRS are not decoded.
Certainly, for foregoing description, filled the situation of the unappropriated running time-frequency resource on the time period shared by DRS by PDSCH, according to RRC signaling, subscriber equipment also knows where PDSCH has been filled in running time-frequency resource shared by DRS, needs to decode to this part PDSCH data user.
Specifically refer to foregoing description herein in detail, therefore not to repeat here.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For system disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (25)
1. a transmission method of the LTE in unlicensed spectrum, is characterized in that, comprising:
Whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
Listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends described DRS and PDSCH simultaneously, described same subframe comprises DRS and can send position, described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
2. the method for claim 1, is characterized in that, before sending described DRS and PDSCH at the same time, also comprises:
Configure the transmission period of described DRS, to make the same subframe of described DRS and PDSCH in described Channel holding time sends simultaneously.
3. method as claimed in claim 2, it is characterized in that, the transmission period of the described DRS of described configuration comprises:
In described Channel holding time, only comprise a DRS when can send position, configure described DRS and can send on position send at this;
In described Channel holding time, comprise multiple DRS when can send position, configure described DRS and can send position at first DRS and send, or,
Configure described DRS in the end DRS can send position and send, or,
If there is the DRS taking subframe 0 or 5 when can send position, configure described DRS and can send on position send at this.
4. method as claimed in claim 3, it is characterized in that, the length of described DRS is less than 1ms, and the transmission period of the described DRS of described configuration also comprises:
Time period shared by described DRS the unappropriated running time-frequency resource of DRS is filled PSS and or SSS and or CRS and or CSI-RS.
5. method as claimed in claim 2, it is characterized in that, the length of described DRS is not more than 5ms, and shared symbol quantity is no less than 4; Described DRS at least comprises PSS, SSS, CRS and configurable CSI-RS.
6. method as claimed in claim 5, it is characterized in that, the transmission period of the described DRS of described configuration comprises:
When described DRS length is greater than 1ms, configures PSS and SSS that described DRS comprises and only send in a subframe, the 6th symbol that meanwhile, described PSS takies the 7th symbol of this subframe, described SSS takies this subframe, and only take the bandwidth of middle 6RB;
The unappropriated running time-frequency resource of other DRS being configured in the subframe sending described PSS, SSS fills PDSCH, and the unappropriated running time-frequency resource of other DRS described is the unappropriated running time-frequency resource of DRS described on the time period shared by described DRS.
7. method as claimed in claim 5, it is characterized in that, the transmission period of the described DRS of described configuration comprises:
When only comprising the sent position of PSS and SSS that a DRS comprises in described Channel holding time, configure PSS and SSS that described DRS comprises and can send on position send at this;
Wherein, the CRS in described DRS and or CSI-RS take the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
8. method as claimed in claim 6, it is characterized in that, the transmission period of the described DRS of described configuration comprises:
When comprising the sent position of PSS and SSS that multiple DRS comprises in described Channel holding time, the length configuring described DRS is greater than 1ms;
Configure PSS and SSS that DRS that described length is greater than 1ms comprises can send position at first and send, or,
Configure PSS and SSS that DRS that described length is greater than 1ms comprises in the end one can send position and send, or,
When PSS and SSS that comprise of DRS taking subframe 0 or 5 if exist can send position, configure DRS that described length is greater than 1ms and can send on position send at this;
Wherein, the CRS in described DRS and or CSI-RS take the time-frequency location that LTE system specifies, other running time-frequency resources fill PDSCH.
9. the method as described in any one of claim 1-8, is characterized in that, also comprises:
When configure the subframe of the PSS/SSS that comprises of described DRS or described DRS outside subframe 0 and 5 sends time, in subframe numbering, adopt different SSS sequences or scrambler to indicate different subframes.
10. the method as described in any one of claim 1-8, it is characterized in that, also comprise: when configure the subframe of the PSS/SSS that comprises of described DRS or described DRS outside subframe 0 and 5 sends time, to adopt in PSS, SSS, CRS and CSI-RS the difference of the filling mode of any one or combination in any to indicate different subframes.
11. methods as described in any one of claim 1-8, is characterized in that, also comprise:
Send the time-frequency location that RRC signaling indicates described DRS to take;
Whether send in DCI signaling indicating user present sub-frame has DRS to send.
12. methods as claimed in claim 11, it is characterized in that, if to the design of DRS when DRS and PDSCH sends together, different to the design of DRS when sending separately with DRS, when having DRS to send in present sub-frame, described DCI signaling is also used to indicate the kind of design of described DRS, and described kind of design comprises the independent transmission types of DRS, and DRS and PDSCH is transmission types simultaneously.
13. the method for claim 1, is characterized in that, also comprise:
Unlicensed spectrum is carried out the LBT Channel Detection of DRS; When the Channel holding time of this PDSCH and the DMTC time of DRS overlap, the LBT not performing DRS when sending DRS within the time of overlap detects.
The transmission method of the LTE in 14. 1 kinds of unlicensed spectrum, is characterized in that, comprising:
Be received in the data that unlicensed spectrum is transmitted, described data are included in DRS and the PDSCH that same subframe sends simultaneously;
To described decoding data;
Wherein, DRS and PDSCH is base station side listens in unlicensed spectrum channel idle based on the LBT mechanism for sending PDSCH, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends simultaneously, described same subframe comprises DRS and can send position, described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
15. methods as claimed in claim 14, is characterized in that, also comprise:
Receive the RRC of the time-frequency location that the described DRS of instruction takies;
Receive the DCI signaling whether having DRS to send in indicating user present sub-frame.
16. methods as claimed in claim 15, it is characterized in that, if to the design of DRS when DRS and PDSCH sends together, different to the design of DRS when sending separately with DRS, when having DRS to send in present sub-frame, described DCI signaling is also used to indicate the kind of design of described DRS, and described kind of design comprises the independent transmission types of DRS, and DRS and PDSCH is transmission types simultaneously.
17. methods as claimed in claim 16, it is characterized in that, described decoded data comprises:
According to the instruction of described RRC and DCI, determine time-frequency location that DRS takies, whether present sub-frame have DRS to send, and when present sub-frame has DRS to send the kind of design of described DRS; And when present sub-frame has DRS to send, the data on the time-frequency location taken described DRS according to the kind of design of DRS are not decoded.
The transmitting device of the LTE in 18. 1 kinds of unlicensed spectrum, is characterized in that, comprising:
First monitoring unit is used for, and whether the channel monitored in unlicensed spectrum based on the LBT mechanism for sending PDSCH is idle;
Transmitting element is used for, listening to channel idle, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends described DRS and PDSCH simultaneously, and described same subframe comprises DRS can send position, and described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
19. devices as claimed in claim 18, is characterized in that, also comprise:
Dispensing unit is used for, and before described first transmitting element sends described DRS and PDSCH simultaneously, configures the transmission period of described DRS, to make the same subframe of described DRS and PDSCH in described Channel holding time sends simultaneously.
20. devices as described in claim 18 or 19, is characterized in that, also comprise:
First indicating member is used for, when configure the subframe of PSS and SSS that comprise of described DRS or described DRS outside subframe 0 and 5 sends time, in subframe numbering subframeindex, adopt different SSS sequences or scrambler to indicate different subframes.
21. devices as described in claim 18 or 19, is characterized in that, also comprise:
Second indicating member, for when configure the subframe of PSS and SSS that comprise of described DRS or described DRS outside subframe 0 and 5 sends time, adopt the difference of PSS, SSS, CRS and CSI-RS filling mode to indicate different subframes.
22. devices as claimed in claim 18, is characterized in that, transmitting element also for:
Send the time-frequency location that RRC signaling indicates described DRS to take;
Whether send in DCI signaling indicating user present sub-frame has DRS to send.
23. devices as claimed in claim 18, is characterized in that, also comprise:
Second monitoring unit is used for, and unlicensed spectrum is carried out the LBT Channel Detection of DRS; When the Channel holding time of this PDSCH and the DMTC time of DRS overlap, the LBT not performing DRS when described second monitoring unit sends DRS within the time of overlap detects.
The transmitting device of the LTE in 24. 1 kinds of unlicensed spectrum, is characterized in that, comprising:
Receiving element is used for, and is received in the data that unlicensed spectrum is transmitted, and described data are included in DRS and the PDSCH that same subframe sends simultaneously;
Decoding unit is used for, to described decoding data;
Wherein, DRS and PDSCH is base station side listens in unlicensed spectrum channel idle based on the LBT mechanism for sending PDSCH, and, overlap with the DMTC time of DRS in this Channel holding time, and comprise one or more DRS in the time of overlap when can send position, same subframe in described Channel holding time sends simultaneously, described same subframe comprises DRS and can send position, described Channel holding time is the Channel holding time sending PDSCH in described unlicensed spectrum.
25. devices as claimed in claim 24, is characterized in that, described receiving element also for:
Receive the RRC of the time-frequency location that the described DRS of instruction takies;
Receive the DCI signaling whether having DRS to send in indicating user present sub-frame.
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| CN201510622135.6A CN105338568B (en) | 2015-09-25 | 2015-09-25 | The transmission method and device of LTE in unlicensed spectrum |
| PCT/CN2015/093512 WO2017049730A1 (en) | 2015-09-25 | 2015-10-31 | Lte transmission method and apparatus on unlicensed spectrum |
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| CN201510622135.6A CN105338568B (en) | 2015-09-25 | 2015-09-25 | The transmission method and device of LTE in unlicensed spectrum |
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| WO (1) | WO2017049730A1 (en) |
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| CN105338568B (en) | 2019-01-25 |
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