CN105491671A - Multi-terminal uplink scheduling method and network system based on permission-assisted access - Google Patents
Multi-terminal uplink scheduling method and network system based on permission-assisted access Download PDFInfo
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- CN105491671A CN105491671A CN201510809364.9A CN201510809364A CN105491671A CN 105491671 A CN105491671 A CN 105491671A CN 201510809364 A CN201510809364 A CN 201510809364A CN 105491671 A CN105491671 A CN 105491671A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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Abstract
The embodiment of the invention discloses a multi-terminal uplink scheduling method and a network system based on permission-assisted access. The multi-terminal uplink scheduling method comprises the following steps: shortening the cyclic prefix of a first orthogonal frequency division multiplexing symbol of a first subframe of a data frame of uplink data transmission and the cyclic prefix of the last orthogonal frequency division multiplexing symbol of a subframe transmitted at the moment, so as to shorten time corresponding to the cyclic prefixes, avoid interference of a terminal performing uplink data transmission at the moment on clear channel assessment of other terminals, and ensure that the other terminals can perform uplink data transmission when interference of other interference sources does not exist. Therefore, time spent for waiting a preconfigured subframe of a base station to perform channel state detection is saved, that is, time delay is reduced, the scheduling flexibility is improved, and the channel resource utilization rate is improved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of multiple terminals uplink dispatch method and the network system based on license supplementary access.
Background technology
The different frequency spectrum of radio magnetic wave is divided out and supplies GSM (GlobalSystemforMobileCommunication, global system for mobile communications), the multiple network such as LTE, Digital Clustering, radio and television uses, each country can divide respective frequency spectrum according to own resource situation for this Guo Ge operator, this part frequency spectrum is called as mandate frequency spectrum, that remaining not yet utilizes or go through to be unlicensed spectrum by public frequency spectrum.
At present, in order to the resource making full use of unlicensed spectrum carries out dilatation to the LTE network based on LAA (LicenseAssistedAccess, license supplementary access) technology, carrying out uplink scheduling to multiple terminals has two kinds of modes.
First kind of way is: independent scheduling is carried out to intrasystem all terminals in base station, sends the authorization for each terminal, and terminal is determined self to carry out the time of channel status detection according to this authorization.For each terminal, when detecting that channel status is the free time, this terminal can carry out uplink; Otherwise inefficacy is this time dispatched in base station, terminal can not carry out uplink, and base station needs to reschedule that (resend authorization, terminal is determined self to carry out the time of channel status detection according to new authorization again, by that analogy).
The second way is: in a radio frames, the pre-configured a series of subframe in base station, and only in these subframes, intrasystem all terminals can carry out channel status detection.For each terminal, when detecting that channel status is the free time, this terminal can carry out uplink; Otherwise can only wait until that the next subframe can carrying out channel status detection carries out channel status detection, namely base station is again dispatched the subframe that this terminal can carry out channel status detection at the next one and is carried out channel status detection.
But, apply above-mentioned first kind of way and uplink scheduling is carried out to multiple terminals, the terminal of pending transmitting uplink data carried out channel status detection before uplink, due to the energy measuring that this detection is only full frequency band, even if therefore the frequency of the terminal transmission data of pending transmitting uplink data is not identical with current frequency of carrying out the terminal transmission data of transmitting uplink data, the terminal of pending transmitting uplink data also can detect channel status not for idle, can not uploading data frame, channel resource utilance is lower.
Apply the above-mentioned second way and uplink scheduling is carried out to multiple terminals, the pre-configured a series of subframe in base station, terminal can only carry out channel status detection in these subframes, namely treats that the terminal of uplink can only be carried out channel status detection in the specific moment thus carry out uplink.Therefore, when terminal is not when just having data to need to transmit in these pre-configured subframes, can only wait until that the next subframe can carrying out channel status detection just can carry out channel status detection, or when a certain terminal detects channel status not for time idle in the subframe can carrying out channel status detection, can only wait until that the next subframe can carrying out channel status detection just can carry out channel status detection, cause its time delay to increase.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of multiple terminals uplink dispatch method and the network system based on license supplementary access, to reduce time delay, to propose the waste of high channel resource use ratio and minimizing channel resource.
For achieving the above object, the embodiment of the invention discloses a kind of multiple terminals uplink dispatch method, be applied to the network system based on license supplementary access, described network system comprises N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station, each terminal in described N number of terminal obtains the authorization of described base station for this terminal upload data frame in advance, described authorization comprises the uploading data frequency of this terminal upload data frame, each terminal in described N number of terminal is according to the authorization received, determine self uploading data frame start upload the moment,
Described method can comprise:
Each terminal in described N number of terminal and described base station are set up after data communication is connected, described base station sends the first dispatch command by radio resource control to this terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in described first dispatch command;
This terminal described is according to described first dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduce T1 duration to make the transmission duration of described first subframe;
This terminal described is according to described first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, T2 duration is reduced again to make the transmission duration of described first subframe, the transmission duration of other subframes except described first subframe reduces T2 duration, wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration;
When have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding this terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that this terminal shortens, this terminal carries out clear channel assessment (CCA) detection to described channel, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that this terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
The embodiment of the invention also discloses a kind of multiple terminals uplink dispatch method, be applied to the network based on license supplementary access technology, described network comprises N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station, each terminal in described N number of terminal obtains the authorization of described base station for this terminal upload data frame in advance, described authorization comprises the uploading data frequency of this terminal upload data frame, each terminal in described N number of terminal is according to the authorization received, determine self uploading data frame start upload the moment,
Described method can comprise:
Described base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, a described y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment;
Described base station sends the second dispatch command by dynamic uplink grant mode to each terminal in a described x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in described second dispatch command;
Described base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in a described y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in described 3rd dispatch command;
Each terminal in a described x terminal is according to described second dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, to make the transmission duration of this subframe reduce T3 duration, wherein, described T3 duration is greater than default 3rd duration;
Each terminal in a described y terminal is according to described 3rd dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, T4 duration is reduced to make the transmission duration of this subframe, wherein, described T3 duration and described T4 duration sum are greater than default 4th duration;
Each terminal in a described y terminal carries out clear channel assessment (CCA) detection to described channel in described T3 duration and described T4 duration, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that each terminal in a described y terminal comprises according to described authorization, transmission self Frame waiting for transmission determined separately.
The embodiment of the invention also discloses a kind of network system based on license supplementary access, can comprise: N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station;
Described base station sends the authorization of uploading data frame in advance for each terminal in described N number of terminal, described authorization comprises the uploading data frequency of this terminal upload data frame;
Each terminal in described N number of terminal obtain described base station send the authorization for own terminal uploading data frame, according to the authorization received, determine self uploading data frame start upload the moment;
Described base station sends the first dispatch command by radio resource control to each terminal in described N number of terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in described first dispatch command;
Receive the first terminal of described first dispatch command that described base station sends according to described first dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduce T1 duration to make the transmission duration of described first subframe;
Described first terminal is according to described first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, T2 duration is reduced again to make the transmission duration of described first subframe, the transmission duration of other subframes except described first subframe reduces T2 duration, wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration;
When exist in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding state to some extent first terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that described first terminal shortens, described first terminal carries out clear channel assessment (CCA) detection to described channel, and determines self Frame waiting for transmission;
The uploading data frequency of the described first terminal uploading data frame that described first terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
The embodiment of the invention also discloses a kind of network system based on license supplementary access, can comprise: N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station;
Described base station sends the authorization of uploading data frame in advance for each terminal in described N number of terminal, described authorization comprises the uploading data frequency of this terminal upload data frame;
Each terminal in described N number of terminal obtain described base station send the authorization for own terminal uploading data frame, according to the authorization received, determine self uploading data frame start upload the moment;
Described base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, a described y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment;
Described base station sends the second dispatch command by dynamic uplink grant mode to each terminal in a described x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in described second dispatch command;
Described base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in a described y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in described 3rd dispatch command;
Each terminal in a described x terminal is according to described second dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, to make the transmission duration of this subframe reduce T3 duration, wherein, described T3 duration is greater than default 3rd duration;
Each terminal in a described y terminal is according to described 3rd dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, T4 duration is reduced to make the transmission duration of this subframe, wherein, described T3 duration and described T4 duration sum are greater than default 4th duration;
Each terminal in a described y terminal carries out clear channel assessment (CCA) detection to described channel in described T3 duration and described T4 duration, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that each terminal in a described y terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
From above-mentioned scheme, in the present embodiment, the Cyclic Prefix of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of pending transmitting uplink data and last OFDM multi-channel multiplexing symbols of the current subframe transmitted is shortened, thus within time corresponding to Cyclic Prefix shortened, avoid current terminal of carrying out transmitting uplink data clear channel assessment (CCA) is carried out to other-end detect and produce interference, and when not having other interference sources to disturb, other-end can carry out transmitting uplink data, do not need to wait the subframe pre-configured to base station to carry out channel status detection, and then decrease time delay, improve dispatching flexibility, improve channel resource utilance.
Certainly, arbitrary product of the present invention is implemented or method must not necessarily need to reach above-described all advantages 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 or description of the prior art 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.
The first schematic flow sheet of the multiple terminals uplink dispatch method that Fig. 1 provides for the embodiment of the present invention;
The second schematic flow sheet of the multiple terminals uplink dispatch method that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the first terminal transmission data frame that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the second terminal transmission data frame that Fig. 4 provides for the embodiment of the present invention;
The structural representation of a kind of network system based on license supplementary access that Fig. 5 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.
In order to solve prior art problem, embodiments provide a kind of multiple terminals uplink dispatch method and a kind of network system based on license supplementary access.First a kind of multiple terminals uplink dispatch method that the embodiment of the present invention provides is described in detail below.
It should be noted that, the multiple terminals uplink dispatch method that the embodiment of the present invention provides is preferably applied in the network system based on license supplementary access, and in actual applications, this network system can be LTE network system.This network system as shown in Figure 5, a kind of structural representation of network system based on license supplementary access that Fig. 5 provides for the embodiment of the present invention.
This network system can comprise N number of terminal and a base station, wherein, described N number of terminal is respectively terminal 1, terminal 2, terminal 3 ... terminal N, described N number of terminal shares a channel and data communication is carried out in described base station, each terminal in described N number of terminal obtains the authorization of described base station for this terminal upload data frame in advance, described authorization comprises the uploading data frequency of this terminal upload data frame, each terminal in described N number of terminal according to the authorization received, determine self uploading data frame start upload the moment.
It should be noted that, terminal only when obtaining base station authorization, just can carry out transmitting uplink data.
The first schematic flow sheet of the multiple terminals uplink dispatch method that Fig. 1 provides for the embodiment of the present invention, can comprise:
S101: each terminal in N number of terminal and base station are set up after data communication is connected, base station sends the first dispatch command by radio resource control to this terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in the first dispatch command.
Concrete, above-mentioned radio resource control can be RRC (RadioResourceControl), OFDM multi-channel multiplexing symbols is OFDM (OrthogonalFrequencyDivisionMultiplexing) symbol, Cyclic Prefix is CP (CyclicPrefix), and the duration of a subframe is 1 millisecond.
Base station sends the first dispatch command by radio resource control to this terminal, can have two kinds of modes.The first: terminal and base station first time set up after data communication is connected, and base station sends the first dispatch command to terminal, when terminal due to network failure needs and base station re-establish data communication be connected time, base station no longer sends the first dispatch command to terminal.The second: whenever terminal and base station set up data communication be connected time, base station all sends the first dispatch command to terminal.
S102: this terminal, according to the first dispatch command, shortens the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduces T1 duration to make the transmission duration of first subframe.
S103: this terminal is according to the first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, to make the transmission duration of first subframe reduce T2 duration again, the transmission duration of other subframes except first subframe reduces T2 duration.
Wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration.
In actual applications, described default first duration can be 4 microseconds, and described second preset duration is can 9 microseconds.
S104: when have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding this terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that this terminal shortens, this terminal carries out clear channel assessment (CCA) detection to channel, and determines self Frame waiting for transmission.
S105: the uploading data frequency of this terminal upload data frame that this terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
Below for two terminals, be described.
As shown in Figure 3, that supposes self uploading data frame that terminal 1 is determined starts that to upload the moment be subframe #n+1, and it is subframe #n+2 that the starting of self uploading data frame that terminal 2 is determined uploads the moment.
Base station sends the first dispatch command by the mode of RRC static configuration to terminal 1 and terminal 2, comprises the CP of first OFDM symbol of first subframe of Frame and the information of the CP of last OFDM symbol of all subframes that shorten the pending transmitting uplink data of this terminal in this first dispatch command.
The first dispatch command that terminal 1 and terminal 2 send according to base station, shorten the CP (the T1 part namely in Fig. 3) of first OFDM symbol of first subframe of the Frame of the pending transmitting uplink data of own terminal respectively, with the CP (the T2 part namely in Fig. 3) of last OFDM symbol of all subframes of the Frame of pending transmitting uplink data, T1+T2 duration is reduced to make the transmission duration of first subframe, the transmission duration of other subframes except first subframe reduces T2 duration, as shown in dash area in Fig. 3, dash area is the duration vacated by shortening CP.
Suppose that current time is subframe #n+1, terminal 1 carries out transmitting uplink data, and at next subframe #n+2, terminal 2 needs to carry out transmitting uplink data.Namely, have in the time period that the next subframe #n+2 of the subframe #n+1 of the current Frame transmitted is corresponding terminal 2 correspondence start upload the moment, in this case, terminal 2 carries out clear channel assessment (CCA) (CCA to channel in the T2 duration that subframe #n+1 vacates, ChannelClearAssessment) detect, because now can not by the interference of terminal 1, and when not having other interference sources to disturb, clear channel assessment (CCA) detect just by, terminal 2 just can carry out transmitting uplink data, increase the probability that terminal 2 carries out transmitting uplink data.In addition, self Frame waiting for transmission is determined in the T1 duration that the T2 duration that can also vacate at subframe #n+1 of terminal 2 and subframe #n+2 vacate.Determine that self Frame waiting for transmission can comprise the preparation for transmitting data frame does, this preparation is prior art, does not repeat at this.
After the T1 duration that terminal 2 is vacated at subframe #n+2, the uploading data frequency of the terminal 2 uploading data frame comprised according to the authorization for terminal 2, transmits self Frame waiting for transmission determined.
In actual applications, in LTE system, the design criterion of CP is the maximum multipath time delay being greater than place communication environments.Find through contrast, CP length in a LTE system order of magnitude larger than WLAN, this is because LTE will consider the application of outdoor macro honeycomb, and WLAN only considers that focus covers, in LTE system, the CP of 0.4 microsecond can support the Multipath Transmission path length difference of 800*10^ (-9) * 3*10^8=240 rice, multipath path length difference possible under being far longer than actual indoor propagation environment, therefore IEEE proposes again CP to foreshorten to 0.4 microsecond further, and its multipath path length difference of corresponding 120 meters remains enough under most indoor scene.That is, 0.4 microsecond is only had to be necessary in normal CP in LTE system.Therefore, T1 and/or T2 duration can be vacated by shortening CP completely.
It should be noted that, to be above-mentionedly described for terminal 1 and terminal 2, be only an instantiation of the present invention, do not form limitation of the invention.
The present invention is embodiment illustrated in fig. 1 in application, the Cyclic Prefix of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of pending transmitting uplink data and last OFDM multi-channel multiplexing symbols of the current subframe transmitted is shortened, thus within time corresponding to Cyclic Prefix shortened, avoid current terminal of carrying out transmitting uplink data clear channel assessment (CCA) is carried out to other-end detect and produce interference, and when not having other interference sources to disturb, other-end can carry out transmitting uplink data, do not need to wait the subframe pre-configured to base station to carry out channel status detection, and then decrease time delay, improve dispatching flexibility, and at one time, multiple terminal can carry out transmitting uplink data simultaneously, decrease the waste of channel resource, improve channel resource utilance.In addition, by the mode of RRC static configuration, mutual simple between base station and terminal, be easy to realize.
The second schematic flow sheet of the multiple terminals uplink dispatch method that Fig. 2 provides for the embodiment of the present invention, can comprise:
S201: base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment.
S202: base station sends the second dispatch command by dynamic uplink grant mode to each terminal in x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in the second dispatch command.
Concrete, above-mentioned dynamic uplink grant mode can be the dynamic-configuration mode of UL (UpLink) grant.
S203: base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in the 3rd dispatch command.
Each terminal in S204:x terminal, according to the second dispatch command, shortens the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, reduces T3 duration to make the transmission duration of this subframe.
Wherein, described T3 duration is greater than default 3rd duration.Concrete, described default 3rd duration can be 4 microseconds.
Each terminal in S205:y terminal, according to the 3rd dispatch command, shortens the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, reduces T4 duration to make the transmission duration of this subframe.
Wherein, described T3 duration and described T4 duration sum are greater than default 4th duration.Concrete, described 4th preset duration can be 9 microseconds.
Each terminal in S206:y terminal carries out clear channel assessment (CCA) detection to channel in T3 duration and T4 duration, and determines self Frame waiting for transmission.
The uploading data frequency of this terminal upload data frame that each terminal in S207:y terminal comprises according to authorization, transmits respective determined Frame waiting for transmission.
As shown in Figure 4, that supposes self uploading data frame that terminal 1 is determined starts that to upload the moment be subframe #n+1, and it is subframe #n+2 that the starting of self uploading data frame that terminal 2 is determined uploads the moment.
Suppose that current time is subframe #n+1, terminal 1 carries out transmitting uplink data, and at next subframe #n+2, terminal 2 needs to carry out transmitting uplink data.Base station according to terminal 1 start upload moment subframe #n+1 and terminal 2 start upload moment subframe #n+2, judge to have in the time period that the next subframe #n+2 of the subframe #n+1 of the current Frame transmitted is corresponding terminal 2 start upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data.For the purpose of simplifying the description, in the present embodiment, suppose that x, y are 1, then current terminal of carrying out transmitting uplink data only has terminal 1, and starting of existing in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding is uploaded terminal corresponding to moment and only have terminal 2.
Base station sends the second dispatch command by the dynamic-configuration mode of ULgrant to terminal 1, comprises the information of the CP of last OFDM symbol shortening the current subframe transmitted of terminal 1 in the second dispatch command.
Base station sends the 3rd dispatch command by the dynamic-configuration mode of ULgrant to terminal 2, comprises the information of the CP of first OFDM symbol of first subframe shortening terminal 2 Frame waiting for transmission in the 3rd dispatch command.
Terminal 1, according to the second dispatch command, shortens the CP of last OFDM symbol of the subframe (subframe #n+1) of the Frame of self current transmission, reduces T3 duration to make terminal 1 at the transmission duration of subframe #n+1.
Terminal 2, according to the 3rd dispatch command, shortens the CP of first OFDM symbol of first subframe of self Frame waiting for transmission, transmits duration reduce T4 duration to make terminal 2 at subframe #n+2.
As shown in dash area in Fig. 4, dash area is the duration vacated by shortening CP.Therefore, terminal 2 carries out CCA detection to channel in the T3 duration vacated, can not by the interference of terminal 1, and when not having other interference sources to disturb, CCA detect just by, terminal 2 just can carry out transmitting uplink data, increases the probability that terminal 2 carries out transmitting uplink data.In addition, terminal 2 can also determine self Frame waiting for transmission in T3 and the T4 duration vacated, and determine that self Frame waiting for transmission can comprise the preparation for transmitting data frame does, this preparation is prior art, does not repeat at this.
Terminal 2 is after T3 and the T4 duration vacated, and the uploading data frequency of the terminal 2 uploading data frame comprised according to the authorization for terminal 2, transmits self Frame waiting for transmission determined.
In actual applications, in LTE system, the design criterion of CP is the maximum multipath time delay being greater than place communication environments.Find through contrast, CP length in a LTE system order of magnitude larger than WLAN, this is because LTE will consider the application of outdoor macro honeycomb, and WLAN only considers that focus covers, in LTE system, the CP of 0.4 microsecond can support the Multipath Transmission path length difference of 800*10^ (-9) * 3*10^8=240 rice, multipath path length difference possible under being far longer than actual indoor propagation environment, therefore IEEE proposes again CP to foreshorten to 0.4 microsecond further, and its multipath path length difference of corresponding 120 meters remains enough under most indoor scene.That is, 0.4 microsecond is only had to be necessary in normal CP in LTE system.Therefore, T3 and/or T4 duration can be vacated by shortening CP completely.
It should be noted that, be above-mentionedly 1 for x and y, terminal 1 and terminal 2 be described, be only an instantiation of the present invention, do not form limitation of the invention.
The present invention is embodiment illustrated in fig. 2 in application, the Cyclic Prefix of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of pending transmitting uplink data and last OFDM multi-channel multiplexing symbols of the current subframe transmitted is shortened, thus within time corresponding to Cyclic Prefix shortened, avoid current terminal of carrying out transmitting uplink data clear channel assessment (CCA) is carried out to other-end detect and produce interference, and when not having other interference sources to disturb, other-end can carry out transmitting uplink data, do not need to wait the subframe pre-configured to base station to carry out channel status detection, and then decrease time delay, improve dispatching flexibility, and at one time, multiple terminal can carry out transmitting uplink data simultaneously, decrease the waste of channel resource, improve channel resource utilance.In addition, by the mode of ULgrant dynamic-configuration, only have in case of need, the shortening of CP is carried out in base station just notification terminal, reduces the risk that channel is taken by other system.
Corresponding with said method embodiment, the embodiment of the present invention also provides the network system based on license supplementary access.
The structural representation of a kind of network system based on license supplementary access that Fig. 5 provides for the embodiment of the present invention, can comprise:
N number of terminal and a base station, wherein, described N number of terminal is respectively terminal 1, terminal 2, terminal 3 ... terminal N, described N number of terminal shares a channel and data communication is carried out in described base station.
Described base station sends the authorization of uploading data frame in advance for each terminal in described N number of terminal, described authorization comprises the uploading data frequency of this terminal upload data frame;
Each terminal in described N number of terminal obtain described base station send the authorization for own terminal uploading data frame, according to the authorization received, determine self uploading data frame start upload the moment.
In the embodiment of shown in Fig. 5, described base station sends the first dispatch command by radio resource control to each terminal in described N number of terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in described first dispatch command;
Receive the first terminal of described first dispatch command that described base station sends according to described first dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduce T1 duration to make the transmission duration of described first subframe;
Described first terminal is according to described first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, T2 duration is reduced again to make the transmission duration of described first subframe, the transmission duration of other subframes except described first subframe reduces T2 duration, wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration;
When exist in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding state to some extent first terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that described first terminal shortens, described first terminal carries out clear channel assessment (CCA) detection to described channel, and determines self Frame waiting for transmission;
The uploading data frequency of the described first terminal uploading data frame that described first terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
Concrete, described default first duration can be 4 microseconds, and described second preset duration can be 9 microseconds.
In another embodiment shown in Fig. 5, described base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, a described y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment;
Described base station sends the second dispatch command by dynamic uplink grant mode to each terminal in a described x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in described second dispatch command;
Described base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in a described y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in described 3rd dispatch command;
Each terminal in a described x terminal is according to described second dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, to make the transmission duration of this subframe reduce T3 duration, wherein, described T3 duration is greater than default 3rd duration;
Each terminal in a described y terminal is according to described 3rd dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, T4 duration is reduced to make the transmission duration of this subframe, wherein, described T3 duration and described T4 duration sum are greater than default 4th duration;
Each terminal in a described y terminal carries out clear channel assessment (CCA) detection to described channel in described T3 duration and described T4 duration, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that each terminal in a described y terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
Concrete, described default 3rd duration can be 4 microseconds, and described 4th preset duration can be 9 microseconds.
The present invention is embodiment illustrated in fig. 5 in application, the Cyclic Prefix of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of pending transmitting uplink data and last OFDM multi-channel multiplexing symbols of the current subframe transmitted is shortened, thus within time corresponding to Cyclic Prefix shortened, avoid current terminal of carrying out transmitting uplink data clear channel assessment (CCA) is carried out to other-end detect and produce interference, and when not having other interference sources to disturb, other-end can carry out transmitting uplink data, do not need to wait the subframe pre-configured to base station to carry out channel status detection, and then decrease time delay, improve dispatching flexibility, and at one time, multiple terminal can carry out transmitting uplink data simultaneously, decrease the waste of channel resource, improve channel resource utilance.When adopting the mode of RRC static configuration to shorten CP, mutual simple between base station and terminal, be easy to realize; When adopting the mode of ULgrant dynamic-configuration to shorten CP, only have in case of need, the shortening of CP is carried out in base station just notification terminal, reduces the risk that channel is taken by other system.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Each embodiment in this specification all adopts relevant mode to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
One of ordinary skill in the art will appreciate that all or part of step realized in said method execution mode is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM/RAM, magnetic disc, CD etc.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (4)
1. a multiple terminals uplink dispatch method, it is characterized in that, be applied to the network system based on license supplementary access, described network system comprises N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station, each terminal in described N number of terminal obtains the authorization of described base station for this terminal upload data frame in advance, described authorization comprises the uploading data frequency of this terminal upload data frame, each terminal in described N number of terminal is according to the authorization received, determine self uploading data frame start upload the moment,
Described method comprises:
Each terminal in described N number of terminal and described base station are set up after data communication is connected, described base station sends the first dispatch command by radio resource control to this terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in described first dispatch command;
This terminal described is according to described first dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduce T1 duration to make the transmission duration of described first subframe;
This terminal described is according to described first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, T2 duration is reduced again to make the transmission duration of described first subframe, the transmission duration of other subframes except described first subframe reduces T2 duration, wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration;
When have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding this terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that this terminal shortens, this terminal carries out clear channel assessment (CCA) detection to described channel, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that this terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
2. a multiple terminals uplink dispatch method, it is characterized in that, be applied to the network based on license supplementary access technology, described network comprises N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station, each terminal in described N number of terminal obtains the authorization of described base station for this terminal upload data frame in advance, described authorization comprises the uploading data frequency of this terminal upload data frame, each terminal in described N number of terminal is according to the authorization received, determine self uploading data frame start upload the moment,
Described method comprises:
Described base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, a described y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment;
Described base station sends the second dispatch command by dynamic uplink grant mode to each terminal in a described x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in described second dispatch command;
Described base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in a described y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in described 3rd dispatch command;
Each terminal in a described x terminal is according to described second dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, to make the transmission duration of this subframe reduce T3 duration, wherein, described T3 duration is greater than default 3rd duration;
Each terminal in a described y terminal is according to described 3rd dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, T4 duration is reduced to make the transmission duration of this subframe, wherein, described T3 duration and described T4 duration sum are greater than default 4th duration;
Each terminal in a described y terminal carries out clear channel assessment (CCA) detection to described channel in described T3 duration and described T4 duration, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that each terminal in a described y terminal comprises according to described authorization, transmission self Frame waiting for transmission determined separately.
3., based on a network system for license supplementary access, it is characterized in that, comprising:
N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station;
Described base station sends the authorization of uploading data frame in advance for each terminal in described N number of terminal, described authorization comprises the uploading data frequency of this terminal upload data frame;
Each terminal in described N number of terminal obtain described base station send the authorization for own terminal uploading data frame, according to the authorization received, determine self uploading data frame start upload the moment;
Described base station sends the first dispatch command by radio resource control to each terminal in described N number of terminal, comprises the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of Frame and the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes that shorten the pending transmitting uplink data of this terminal in described first dispatch command;
Receive the first terminal of described first dispatch command that described base station sends according to described first dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame of the pending transmitting uplink data of own terminal, reduce T1 duration to make the transmission duration of described first subframe;
Described first terminal is according to described first dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of all subframes of the Frame of the pending transmitting uplink data of own terminal, T2 duration is reduced again to make the transmission duration of described first subframe, the transmission duration of other subframes except described first subframe reduces T2 duration, wherein, described T2 duration is greater than default first duration, and described T1 duration and described T2 duration sum are greater than default second duration;
When exist in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding state to some extent first terminal corresponding start to upload the moment time, in the T1 duration that the T2 duration that the Cyclic Prefix shortening the current subframe transmitted is corresponding is corresponding with the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of the Frame waiting for transmission that described first terminal shortens, described first terminal carries out clear channel assessment (CCA) detection to described channel, and determines self Frame waiting for transmission;
The uploading data frequency of the described first terminal uploading data frame that described first terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
4., based on a network system for license supplementary access, it is characterized in that, comprising:
N number of terminal and a base station, wherein, described N number of terminal shares a channel and data communication is carried out in described base station;
Described base station sends the authorization of uploading data frame in advance for each terminal in described N number of terminal, described authorization comprises the uploading data frequency of this terminal upload data frame;
Each terminal in described N number of terminal obtain described base station send the authorization for own terminal uploading data frame, according to the authorization received, determine self uploading data frame start upload the moment;
Described base station according to each terminal start upload the moment, judge to have in the time period that the next subframe of the subframe of the current Frame transmitted is corresponding when starting to upload the moment, determine currently to carry out x terminal of transmitting uplink data and y terminal of pending transmitting uplink data, a described y terminal is that starting of existing in time period corresponding to the next subframe of the subframe of the current Frame transmitted uploads terminal corresponding to moment;
Described base station sends the second dispatch command by dynamic uplink grant mode to each terminal in a described x terminal, comprises the information of the Cyclic Prefix of last OFDM multi-channel multiplexing symbols shortening the current subframe transmitted of terminal in described second dispatch command;
Described base station sends the 3rd dispatch command by dynamic uplink grant mode to each terminal in a described y terminal, comprises the information of the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe shortening terminal Frame waiting for transmission in described 3rd dispatch command;
Each terminal in a described x terminal is according to described second dispatch command, shorten the Cyclic Prefix of last OFDM multi-channel multiplexing symbols of the subframe of the Frame of self current transmission, to make the transmission duration of this subframe reduce T3 duration, wherein, described T3 duration is greater than default 3rd duration;
Each terminal in a described y terminal is according to described 3rd dispatch command, shorten the Cyclic Prefix of first OFDM multi-channel multiplexing symbols of first subframe of self Frame waiting for transmission, T4 duration is reduced to make the transmission duration of this subframe, wherein, described T3 duration and described T4 duration sum are greater than default 4th duration;
Each terminal in a described y terminal carries out clear channel assessment (CCA) detection to described channel in described T3 duration and described T4 duration, and determines self Frame waiting for transmission;
The uploading data frequency of this terminal upload data frame that each terminal in a described y terminal comprises according to described authorization, transmits self Frame waiting for transmission determined.
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