CN105491671B - A kind of multiple terminals uplink dispatch method and the network system based on license supplementary access - Google Patents
A kind of multiple terminals uplink dispatch method and the network system based on license supplementary access Download PDFInfo
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- CN105491671B CN105491671B CN201510809364.9A CN201510809364A CN105491671B CN 105491671 B CN105491671 B CN 105491671B CN 201510809364 A CN201510809364 A CN 201510809364A CN 105491671 B CN105491671 B CN 105491671B
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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 kind of multiple terminals uplink dispatch method and based on the network system for permitting supplementary access, the cyclic prefix of the last one OFDM multi-channel multiplexing symbols of cyclic prefix and the subframe currently transmitted to first OFDM multi-channel multiplexing symbols of first subframe of the data frame of pending transmitting uplink data shortens, to avoid the terminal for currently carrying out transmitting uplink data within the cyclic prefix corresponding time of shortening to the progress clear channel assessment (CCA) detection generation interference of other terminals, and in the case where no other interference sources interference, other terminals are able to carry out transmitting uplink data, it needs not wait for the preconfigured subframe in base station and carries out channel status detection, and then reduce time delay, improve dispatching flexibility, improve channel resource utilization rate.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of multiple terminals uplink dispatch method and based on license auxiliary visit
The network system asked.
Background technique
The different frequency spectrum of radio magnetic wave is divided out for GSM (Global System for Mobile
Communication, global system for mobile communications), LTE, Digital Clustering, the multiple networks such as radio and television use, each country
It can be that the Guo Ge operator divides respective frequency spectrum according to own resource situation, this partial frequency spectrum, which is referred to as, authorizes frequency spectrum, remaining
It is still unused or go through to be unlicensed spectrum with common frequency spectrum.
Currently, in order to make full use of the resource of unlicensed spectrum to based on LAA (License Assisted Access, perhaps
Can supplementary access) LTE network of technology carries out dilatation, and carrying out uplink scheduling to multiple terminals, there are two types of modes.
First way is：Base station carries out independent scheduling to all terminals in system, sends awarding for each terminal
Power license, terminal determine that itself carries out the time of channel status detection according to the authorization.For each terminal, work as inspection
When to measure channel status be idle, which can carry out uplink；Otherwise, failure is this time dispatched in base station, and terminal cannot be into
Row uplink, base station need reschedule (retransmit authorization, terminal further according to new authorization determine itself into
The time of row channel status detection, and so on).
The second way is：In a radio frames, base station is pre-configured with a series of subframe, only in these subframes, is
All terminals in system can carry out channel status detection.For each terminal, when it is idle for detecting channel status,
The terminal can carry out uplink；Otherwise, channel can only be carried out until next subframe that can carry out channel status detection
State-detection, i.e. base station dispatch the terminal again and carry out channel status inspection in next subframe that can carry out channel status detection
It surveys.
But uplink scheduling, the end of pending transmitting uplink data are carried out to multiple terminals using above-mentioned first way
End carries out channel status detection before uplink, since the detection is only the energy measuring of full frequency band, even if to
It carries out the frequency of the terminal transmission data of transmitting uplink data and is currently carrying out the terminal transmission data of transmitting uplink data
Frequency it is not identical, the terminal of pending transmitting uplink data also can detect channel status not and be idle, can not upload number
According to frame, channel resource utilization rate is lower.
Uplink scheduling is carried out to multiple terminals using the above-mentioned second way, base station is pre-configured with a series of subframe, eventually
End can only carry out channel status detection in these subframes, i.e., channel shape can only be carried out at the time of specific to the terminal of uplink
State detection is to carry out uplink.Therefore, when terminal is not to have data to need to transmit in these preconfigured subframes just
When, channel status detection can only can be just carried out until next subframe that can carry out channel status detection, or when a certain
Terminal when it is the free time that the subframe that can carry out channel status detection, which detects channel status not, can only until it is next can be into
The subframe of row channel status detection can just carry out channel status detection, its time delay is caused to increase.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of multiple terminals uplink dispatch method and based on license supplementary access
Network system, with the waste for reducing time delay, mentioning high channel resource use ratio and reducing channel resource.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of multiple terminals uplink dispatch methods, are applied to based on perhaps
Can supplementary access network system, the network system includes N number of terminal and a base station, wherein N number of terminal share one
A channel and the base station carry out data communication, and the base station is obtained ahead of time for the end in each terminal in N number of terminal
End uploads the authorization of data frame, includes the upload data frequency of the terminal upload data frame, the N in the authorization
For each terminal in a terminal according to the authorization received, determine itself upload data frame starts the upload moment；
The method may include：
It is established after data communication connect in each terminal and the base station in N number of terminal, the base station passes through nothing
Line Resource Control protocols send the first dispatch command to the terminal, pending comprising shortening the terminal in first dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe of the data frame of transmitting uplink data and all
The information of the cyclic prefix of the last one OFDM multi-channel multiplexing symbols of subframe；
The described terminal shortens the data frame of the pending transmitting uplink data of own terminal according to first dispatch command
First subframe first OFDM multi-channel multiplexing symbols cyclic prefix so that when the transmission of first subframe
It is long to reduce T1 duration；
The described terminal shortens the data frame of the pending transmitting uplink data of own terminal according to first dispatch command
All subframes the last one OFDM multi-channel multiplexing symbols cyclic prefix so that when the transmission of first subframe
Length reduces T2 duration again, and the transmission duration of other subframes in addition to first subframe reduces T2 duration, wherein the T2
Duration is greater than default first duration, and the sum of the T1 duration and the T2 duration are greater than default second duration；
When there are the terminals pair in next subframe corresponding period of the subframe of the data frame currently transmitted
Answer when starting to upload the moment, shortening the corresponding T2 duration of cyclic prefix of subframe currently transmitted and the terminal shortens
Data frame to be transmitted first subframe first OFDM multi-channel multiplexing symbols cyclic prefix corresponding T1 when
In length, which carries out clear channel assessment (CCA) detection to the channel, and determines itself data frame to be transmitted；
The terminal is according to the upload data frequency for the terminal upload data frame for including in the authorization, and transmission institute is really
Itself fixed data frame to be transmitted.
The embodiment of the invention also discloses a kind of multiple terminals uplink dispatch method, it is applied to based on license supplementary access technology
Network, the network includes N number of terminal and a base station, wherein N number of terminal share channel and the base station into
The authorization that the base station is directed to the terminal upload data frame is obtained ahead of time in row data communication, each terminal in N number of terminal
Permit, includes the upload data frequency of the terminal upload data frame in the authorization, each terminal in N number of terminal
According to the authorization received, determine itself upload data frame starts the upload moment；
The method may include：
The base station starts the upload moment according to each terminal, judges the subframe of the data frame currently transmitted
When in the next subframe corresponding period there are starting to upload the moment, the x for currently carrying out transmitting uplink data is determined
Y terminal of a terminal and pending transmitting uplink data, the y terminal are the subframe of the data frame currently transmitted
Next subframe corresponding period in existing start to upload moment corresponding terminal；
The base station sends second by each terminal of the dynamic uplink grant mode into the x terminal and adjusts
Degree instructs, the last one orthogonal frequency-division for the subframe currently transmitted in second dispatch command comprising shortening terminal
The information of the cyclic prefix of multiplexed symbols；
The base station sends third tune by each terminal of the dynamic uplink grant mode into the y terminal
Degree instructs, first orthogonal frequency of first subframe comprising shortening terminal data frame to be transmitted in the third dispatch command
The information of the cyclic prefix of division multiplexing symbol；
Each terminal in the x terminal shortens the data frame of itself current transmission according to second dispatch command
Subframe the last one OFDM multi-channel multiplexing symbols cyclic prefix so that the subframe transmission duration reduce T3 when
It is long, wherein the T3 duration is greater than default third duration；
Each terminal in the y terminal shortens itself data frame to be transmitted according to the third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe, when so that the transmission duration of the subframe reducing T4
It is long, wherein the sum of the T3 duration and the T4 duration are greater than default 4th duration；
Each terminal in the y terminal carries out idle letter to the channel in the T3 duration and the T4 duration
Road assessment detection, and determine itself data frame to be transmitted；
Each terminal in the y terminal according to the terminal upload data frame for including in the authorization upload
Data frequency transmits respectively itself identified data frame to be transmitted.
The embodiment of the invention also discloses a kind of network systems based on license supplementary access, may include：N number of terminal and
One base station, wherein N number of terminal shares a channel and the base station carries out data communication；
The base station is directed to each terminal in N number of terminal in advance and sends the authorization for uploading data frame, described
It include the upload data frequency of the terminal upload data frame in authorization；
Each terminal in N number of terminal obtains the authorization that data frame is uploaded for own terminal that the base station is sent
License, according to the authorization received, determine itself upload data frame starts the upload moment；
The base station sends the first scheduling by each terminal of the radio resource control into N number of terminal and refers to
It enables, comprising shortening the of first subframe of the data frame of the pending transmitting uplink data of the terminal in first dispatch command
The last one OFDM multi-channel multiplexing symbols of the cyclic prefix and all subframes of one OFDM multi-channel multiplexing symbols
The information of cyclic prefix；
The first terminal for first dispatch command that the base station is sent is received according to first dispatch command, contracting
First OFDM multi-channel multiplexing symbols of first subframe of the data frame of the short pending transmitting uplink data of own terminal
Cyclic prefix so that first subframe transmission duration reduce T1 duration；
The first terminal shortens the data of the pending transmitting uplink data of own terminal according to first dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of all subframes of frame, so that the transmission of first subframe
Duration reduces T2 duration again, and the transmission duration of other subframes in addition to first subframe reduces T2 duration, wherein described
T2 duration is greater than default first duration, and the sum of the T1 duration and the T2 duration are greater than default second duration；
First is stated when existing in next subframe corresponding period of the subframe of the data frame currently transmitted
Terminal is corresponding when starting to upload the moment, the corresponding T2 duration of cyclic prefix for shortening the subframe currently transmitted with it is described
Before the circulation of first OFDM multi-channel multiplexing symbols of first subframe of the data frame to be transmitted that first terminal shortens
Sew in corresponding T1 duration, the first terminal carries out clear channel assessment (CCA) detection to the channel, and determines that itself is to be transmitted
Data frame；
The first terminal uploads the upload data of data frame according to the first terminal for including in the authorization
Frequency transmits itself identified data frame to be transmitted.
The embodiment of the invention also discloses a kind of network systems based on license supplementary access, may include：N number of terminal and
One base station, wherein N number of terminal shares a channel and the base station carries out data communication；
The base station is directed to each terminal in N number of terminal in advance and sends the authorization for uploading data frame, described
It include the upload data frequency of the terminal upload data frame in authorization；
Each terminal in N number of terminal obtains the authorization that data frame is uploaded for own terminal that the base station is sent
License, according to the authorization received, determine itself upload data frame starts the upload moment；
The base station starts the upload moment according to each terminal, judges the subframe of the data frame currently transmitted
When in the next subframe corresponding period there are starting to upload the moment, the x for currently carrying out transmitting uplink data is determined
Y terminal of a terminal and pending transmitting uplink data, the y terminal are the subframe of the data frame currently transmitted
Next subframe corresponding period in existing start to upload moment corresponding terminal；
The base station sends second by each terminal of the dynamic uplink grant mode into the x terminal and adjusts
Degree instructs, the last one orthogonal frequency-division for the subframe currently transmitted in second dispatch command comprising shortening terminal
The information of the cyclic prefix of multiplexed symbols；
The base station sends third tune by each terminal of the dynamic uplink grant mode into the y terminal
Degree instructs, first orthogonal frequency of first subframe comprising shortening terminal data frame to be transmitted in the third dispatch command
The information of the cyclic prefix of division multiplexing symbol；
Each terminal in the x terminal shortens the data frame of itself current transmission according to second dispatch command
Subframe the last one OFDM multi-channel multiplexing symbols cyclic prefix so that the subframe transmission duration reduce T3 when
It is long, wherein the T3 duration is greater than default third duration；
Each terminal in the y terminal shortens itself data frame to be transmitted according to the third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe, when so that the transmission duration of the subframe reducing T4
It is long, wherein the sum of the T3 duration and the T4 duration are greater than default 4th duration；
Each terminal in the y terminal carries out idle letter to the channel in the T3 duration and the T4 duration
Road assessment detection, and determine itself data frame to be transmitted；
Each terminal in the y terminal according to the terminal upload data frame for including in the authorization upload
Data frequency transmits itself identified data frame to be transmitted.
By above-mentioned scheme as it can be seen that in the present embodiment, to first son of the data frame of pending transmitting uplink data
The last one orthogonal frequency of the cyclic prefix of first OFDM multi-channel multiplexing symbols of frame and the subframe currently transmitted
The cyclic prefix of division multiplexing symbol is shortened, to avoid within the cyclic prefix corresponding time of shortening currently just
Clear channel assessment (CCA) detection is carried out to other terminals in the terminal for carrying out transmitting uplink data and generates interference, and it is other
In the case that interference source interferes, other terminals are able to carry out transmitting uplink data, need not wait for the preconfigured subframe in base station
Channel status detection is carried out, and then reduces time delay, dispatching flexibility is improved, improves channel resource utilization rate.
Certainly, it implements any of the products of the present invention or method must be not necessarily required to reach all the above excellent simultaneously
Point.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the first flow diagram of multiple terminals uplink dispatch method provided in an embodiment of the present invention；
Fig. 2 is second of flow diagram of multiple terminals uplink dispatch method provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of the first terminal transmission data frame provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of second of terminal transmission data frame provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of network system based on license supplementary access provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to solve prior art problem, the embodiment of the invention provides a kind of multiple terminals uplink dispatch method and a kind of bases
In the network system of license supplementary access.First below to a kind of multiple terminals uplink dispatch method provided in an embodiment of the present invention into
Row is described in detail.
It should be noted that multiple terminals uplink dispatch method provided by the embodiment of the present invention is preferably applied in based on license
The network system of supplementary access, in practical applications, the network system can be LTE network system.The network system such as Fig. 5 institute
Show, Fig. 5 is a kind of structural schematic diagram of network system based on license supplementary access provided in an embodiment of the present invention.
The network system may include N number of terminal and a base station, wherein N number of terminal is respectively terminal 1, terminal
2, terminal 3 ... terminal N, N number of terminal shares channel and the base station carries out data communication, in N number of terminal
Each terminal the authorization that the base station is directed to the terminal upload data frame is obtained ahead of time, including in the authorization should
The upload data frequency of terminal upload data frame, each terminal in N number of terminal are determined according to the authorization received
Itself upload data frame starts the upload moment.
It should be noted that terminal only in the case where obtaining base station authorization, just can be carried out transmitting uplink data.
Fig. 1 is the first flow diagram of multiple terminals uplink dispatch method provided in an embodiment of the present invention, may include：
S101：Each terminal in N number of terminal and base station are established after data communication connect, and base station passes through radio resource control
Agreement processed sends the first dispatch command to the terminal, includes the shortening pending transmitting uplink data of the terminal in the first dispatch command
Data frame first subframe first OFDM multi-channel multiplexing symbols cyclic prefix and all subframes last
The information of the cyclic prefix of a OFDM multi-channel multiplexing symbols.
Specifically, above-mentioned radio resource control can be RRC (Radio Resource Control), orthogonal frequency
Multiplexing symbol is OFDM (Orthogonal Frequency Division Multiplexing) symbol, and cyclic prefix is
CP (Cyclic Prefix), subframe when it is 1 millisecond a length of.
Base station sends the first dispatch command to the terminal by radio resource control, can be there are two types of mode.First
Kind：Terminal and base station are established for the first time after data communication connect, and base station is to terminal the first dispatch command of transmission, when terminal is due to net
When network failure needs re-establish data communication with base station and connect, base station is no longer to terminal the first dispatch command of transmission.Second：
When terminal, which establishes data communication with base station, to be connect, base station all sends the first dispatch command to terminal.
S102：The terminal shortens the data frame of the pending transmitting uplink data of own terminal according to the first dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe, so that the transmission duration of first subframe is reduced
T1 duration.
S103：The terminal shortens the data frame of the pending transmitting uplink data of own terminal according to the first dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of all subframes, so that the transmission duration of first subframe subtracts again
The transmission duration of few T2 duration, other subframes in addition to first subframe reduces T2 duration.
Wherein, the T2 duration is greater than default first duration, and the sum of the T1 duration and the T2 duration, which are greater than, presets the
Two durations.
In practical applications, default first duration can be 4 microseconds, and second preset duration is can be with 9 microseconds.
S104：When there are the ends in next subframe corresponding period of the subframe of the data frame currently transmitted
It holds corresponding when starting to upload the moment, is shortening the corresponding T2 duration of cyclic prefix of subframe and the terminal currently transmitted
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe of the data frame to be transmitted shortened is corresponding
In T1 duration, which carries out clear channel assessment (CCA) detection to channel, and determines itself data frame to be transmitted.
S105：The terminal is passed according to the upload data frequency for the terminal upload data frame for including in the authorization
Itself data frame to be transmitted determined by defeated.
Below by taking two terminals as an example, it is illustrated.
As shown in Figure 3, it is assumed that the moment that starts to upload for itself upload data frame that terminal 1 determines is subframe #n+1, terminal 2
The determining moment that starts to upload for itself uploading data frame is subframe #n+2.
Base station sends the first dispatch command to terminal 1 and terminal 2 by way of RRC static configuration, which refers to
The CP of first OFDM symbol of first subframe of the data frame comprising the shortening pending transmitting uplink data of the terminal in order
With the information of the CP of the last one OFDM symbol of all subframes.
The first dispatch command that terminal 1 and terminal 2 are sent according to base station, is respectively shortened the pending upstream data of own terminal
The CP (i.e. the part T1 in Fig. 3) of first OFDM symbol of first subframe of the data frame of transmission and pending upper line number
According to the CP (i.e. the part T2 in Fig. 3) of the last one OFDM symbol of all subframes of the data frame of transmission, so that first son
The transmission duration of frame reduces T1+T2 duration, and the transmission duration of other subframes in addition to first subframe reduces T2 duration, such as schemes
In 3 shown in dash area, dash area is the duration vacated by shortening CP.
Assuming that current time is subframe #n+1, terminal 1 is carrying out transmitting uplink data, in next subframe #n+2, terminal 2
It needs to carry out transmitting uplink data.That is, next subframe #n+2 of the subframe #n+1 of the data frame currently transmitted is corresponding
Start to upload the moment there are terminal 2 is corresponding in period, in this case, terminal 2 is in the T2 that subframe #n+1 is vacated
Clear channel assessment (CCA) (CCA, Channel Clear Assessment) detection is carried out to channel in long, because at this time will not be by end
The interference at end 1, and in the case where no other interference sources interference, clear channel assessment (CCA) detection just can pass through, terminal 2
To carry out transmitting uplink data, the probability that terminal 2 carries out transmitting uplink data is increased.In addition, terminal 2 can also be in subframe #n
Itself data frame to be transmitted is determined in the T1 duration that+1 T2 duration vacated and subframe #n+2 are vacated.Determine that itself is to be transmitted
Data frame may include the preparation done for transmitting data frame, which is the prior art, and this will not be repeated here.
Terminal 2 is after the T1 duration that subframe #n+2 is vacated, according in the terminal 2 for including in the authorization of terminal 2
The upload data frequency of data frame is passed, itself identified data frame to be transmitted is transmitted.
In practical applications, the maximum multipath time delay of communication environments where the design criteria of CP is greater than in LTE system.Through
Comparison finds that the CP length ratio WLAN in LTE system is order of magnitude greater, this is because LTE will consider outdoor macro honeycomb
Application, and WLAN only considers that hot spot covers, and the CP of 0.4 microsecond can support 800*10^ (- 9) * 3*10^ in LTE system
8=240 meters of Multipath Transmission path length difference is far longer than possible multipath path length difference under practical indoor propagation environment, therefore IEEE
It further proposes CP foreshortening to 0.4 microsecond, corresponds to 120 meters of multipath path length difference under most indoor scenes still
It is enough.That is, it is necessary for there was only 0.4 microsecond in LTE system in normal CP.Therefore, contracting can be passed through completely
Short CP vacates T1 and/or T2 duration.
It should be noted that above-mentioned be illustrated by taking terminal 1 and terminal 2 as an example, a specific example only of the invention, and
It does not constitute a limitation of the invention.
Using embodiment illustrated in fig. 1 of the present invention, to the of first subframe of the data frame of pending transmitting uplink data
The last one orthogonal frequency-division of the cyclic prefix of one OFDM multi-channel multiplexing symbols and the subframe currently transmitted
The cyclic prefix of multiplexed symbols is shortened, and is currently being carried out to avoid within the cyclic prefix corresponding time of shortening
The terminal of transmitting uplink data carries out clear channel assessment (CCA) detection to other terminals and generates interference, and in other no interference sources
In the case where interference, other terminals are able to carry out transmitting uplink data, need not wait for the preconfigured subframe in base station and carry out letter
Road state-detection, and then reduce time delay, improves dispatching flexibility, and in the same time, multiple terminals can simultaneously into
Row transmitting uplink data reduces the waste of channel resource, improves channel resource utilization rate.In addition, passing through RRC static configuration
Mode, interacted between base station and terminal simple, it is easy to accomplish.
Fig. 2 is second of flow diagram of multiple terminals uplink dispatch method provided in an embodiment of the present invention, may include：
S201：Base station starts the upload moment according to each terminal, judges the subframe of the data frame currently transmitted
Next subframe corresponding period in there are starting to upload the moment when, determine and currently carrying out transmitting uplink data
Y terminal of x terminal and pending transmitting uplink data, y terminal are the subframe of the data frame currently transmitted
It is existing in the next subframe corresponding period to start to upload moment corresponding terminal.
S202：Base station sends the second scheduling by each terminal of the dynamic uplink grant mode into x terminal
It instructs, is accorded in the second dispatch command comprising shortening the last one Orthodoxy Frequency Division Multiplex for the subframe that terminal is currently being transmitted
Number cyclic prefix information.
Specifically, above-mentioned dynamic uplink grant mode can be the dynamic configuration mode of UL (UpLink) grant.
S203：Base station sends third scheduling by each terminal of the dynamic uplink grant mode into y terminal
It instructs, first orthogonal frequency-division of first subframe comprising shortening terminal data frame to be transmitted in third dispatch command
The information of the cyclic prefix of multiplexed symbols.
S204：Each terminal in x terminal shortens the son of the data frame of itself current transmission according to the second dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of frame, so that the transmission duration of the subframe reduces T3 duration.
Wherein, the T3 duration is greater than default third duration.Specifically, the default third duration can be 4 microseconds.
S205：Each terminal in y terminal shortens the first of itself data frame to be transmitted according to third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of a subframe, so that the transmission duration of the subframe reduces T4 duration.
Wherein, the sum of the T3 duration and the T4 duration are greater than default 4th duration.Specifically, it is described 4th it is default when
Length can be 9 microseconds.
S206：Each terminal in y terminal carries out clear channel assessment (CCA) detection to channel in T3 duration and T4 duration,
And determine itself data frame to be transmitted.
S207：Each terminal in y terminal according to the terminal upload data frame for including in authorization upload number
According to frequency, respectively identified data frame to be transmitted is transmitted.
It is assumed that the moment that starts to upload for itself uploading data frame that terminal 1 determines is subframe #n+1, terminal 2
The determining moment that starts to upload for itself uploading data frame is subframe #n+2.
Assuming that current time is subframe #n+1, terminal 1 is carrying out transmitting uplink data, in next subframe #n+2, terminal 2
It needs to carry out transmitting uplink data.Base station according to terminal 1 start to upload moment subframe #n+1 and terminal 2 start upload the moment
Subframe #n+2 judges the corresponding period memory of next subframe #n+2 of the subframe #n+1 of the data frame currently transmitted
Have terminal 2 start upload the moment, determine and currently carrying out the x terminal and pending upper line number of transmitting uplink data
According to y terminal of transmission.To simplify the explanation, in the present embodiment, it is assumed that x, y are 1, then are currently carrying out upstream data biography
Defeated terminal only has terminal 1, existing in next subframe corresponding period of the subframe of the data frame currently transmitted
Start upload moment corresponding terminal and there was only terminal 2.
Base station sends the second dispatch command to terminal 1 by the dynamic configuration mode of UL grant, in the second dispatch command
Information comprising shortening the CP of the last one OFDM symbol of the subframe that terminal 1 is currently being transmitted.
Base station sends third dispatch command to terminal 2 by the dynamic configuration mode of UL grant, in third dispatch command
Information comprising shortening the CP of first OFDM symbol of first subframe of the data frame to be transmitted of terminal 2.
Terminal 1 shortens the last of the subframe (subframe #n+1) of the data frame of itself current transmission according to the second dispatch command
The CP of one OFDM symbol, so that transmission duration of the terminal 1 in subframe #n+1 reduces T3 duration.
Terminal 2 shortens first OFDM of first subframe of itself data frame to be transmitted according to third dispatch command
The CP of symbol, so that terminal 2 reduces T4 duration in subframe #n+2 transmission duration.
As shown in dash area in Fig. 4, dash area is the duration vacated by shortening CP.Therefore, terminal 2 is being vacated
CCA detection is carried out to channel in T3 duration, will not by the interference of terminal 1, and in the case where no other interference sources interference,
CCA detection just can pass through, and terminal 2 can carry out transmitting uplink data, increase terminal 2 and carry out the general of transmitting uplink data
Rate.In addition, terminal 2 can also determine itself data frame to be transmitted in T3 the and T4 duration vacated, determine that itself is to be transmitted
Data frame may include the preparation done for transmitting data frame, which is the prior art, and this will not be repeated here.
Terminal 2 uploads number after T3 the and T4 duration vacated, according to for the terminal 2 for including in the authorization of terminal 2
According to the upload data frequency of frame, itself identified data frame to be transmitted is transmitted.
In practical applications, the maximum multipath time delay of communication environments where the design criteria of CP is greater than in LTE system.Through
Comparison finds that the CP length ratio WLAN in LTE system is order of magnitude greater, this is because LTE will consider outdoor macro honeycomb
Application, and WLAN only considers that hot spot covers, and the CP of 0.4 microsecond can support 800*10^ (- 9) * 3*10^ in LTE system
8=240 meters of Multipath Transmission path length difference is far longer than possible multipath path length difference under practical indoor propagation environment, therefore IEEE
It further proposes CP foreshortening to 0.4 microsecond, corresponds to 120 meters of multipath path length difference under most indoor scenes still
It is enough.That is, it is necessary for there was only 0.4 microsecond in LTE system in normal CP.Therefore, contracting can be passed through completely
Short CP vacates T3 and/or T4 duration.
It should be noted that above-mentioned be illustrated so that x and y are 1, terminal 1 and terminal 2 as an example, only of the invention one
Specific example, and do not constitute a limitation of the invention.
Using embodiment illustrated in fig. 2 of the present invention, to the of first subframe of the data frame of pending transmitting uplink data
The last one orthogonal frequency-division of the cyclic prefix of one OFDM multi-channel multiplexing symbols and the subframe currently transmitted
The cyclic prefix of multiplexed symbols is shortened, and is currently being carried out to avoid within the cyclic prefix corresponding time of shortening
The terminal of transmitting uplink data carries out clear channel assessment (CCA) detection to other terminals and generates interference, and in other no interference sources
In the case where interference, other terminals are able to carry out transmitting uplink data, need not wait for the preconfigured subframe in base station and carry out letter
Road state-detection, and then reduce time delay, improves dispatching flexibility, and in the same time, multiple terminals can simultaneously into
Row transmitting uplink data reduces the waste of channel resource, improves channel resource utilization rate.In addition, dynamic by UL grant
The mode of state configuration, only in case of need, base station just notifies terminal to carry out the shortening of CP, and reducing channel by other is
The risk for occupancy of uniting.
Corresponding with above method embodiment, the embodiment of the present invention also provides the network system based on license supplementary access.
Fig. 5 is a kind of structural schematic diagram of network system based on license supplementary access provided in an embodiment of the present invention, can
To include：
N number of terminal and a base station, wherein N number of terminal is respectively terminal 1, terminal 2, terminal 3 ... terminal N, institute
It states N number of terminal and shares a channel and base station progress data communication.
The base station is directed to each terminal in N number of terminal in advance and sends the authorization for uploading data frame, described
It include the upload data frequency of the terminal upload data frame in authorization；
Each terminal in N number of terminal obtains the authorization that data frame is uploaded for own terminal that the base station is sent
License, according to the authorization received, determine itself upload data frame starts the upload moment.
In one embodiment shown in Fig. 5, the base station is by radio resource control into N number of terminal
Each terminal sends the first dispatch command, includes the shortening pending transmitting uplink data of the terminal in first dispatch command
The last one of the cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe of data frame and all subframes
The information of the cyclic prefix of OFDM multi-channel multiplexing symbols；
The first terminal for first dispatch command that the base station is sent is received according to first dispatch command, contracting
First OFDM multi-channel multiplexing symbols of first subframe of the data frame of the short pending transmitting uplink data of own terminal
Cyclic prefix so that first subframe transmission duration reduce T1 duration；
The first terminal shortens the data of the pending transmitting uplink data of own terminal according to first dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of all subframes of frame, so that the transmission of first subframe
Duration reduces T2 duration again, and the transmission duration of other subframes in addition to first subframe reduces T2 duration, wherein described
T2 duration is greater than default first duration, and the sum of the T1 duration and the T2 duration are greater than default second duration；
First is stated when existing in next subframe corresponding period of the subframe of the data frame currently transmitted
Terminal is corresponding when starting to upload the moment, the corresponding T2 duration of cyclic prefix for shortening the subframe currently transmitted with it is described
Before the circulation of first OFDM multi-channel multiplexing symbols of first subframe of the data frame to be transmitted that first terminal shortens
Sew in corresponding T1 duration, the first terminal carries out clear channel assessment (CCA) detection to the channel, and determines that itself is to be transmitted
Data frame；
The first terminal uploads the upload data of data frame according to the first terminal for including in the authorization
Frequency transmits itself identified data frame to be transmitted.
Specifically, default first duration can be 4 microseconds, second preset duration can be 9 microseconds.
In another embodiment shown in Fig. 5, the base station starts the upload moment according to each terminal, judges to work as
When in next subframe corresponding period of the subframe of the preceding data frame transmitted there are starting to upload the moment, determination is worked as
Y terminal of preceding x terminal for carrying out transmitting uplink data and pending transmitting uplink data, the y terminal are
It is corresponding to start the upload moment existing in next subframe corresponding period of the subframe of the data frame currently transmitted
Terminal；
The base station sends second by each terminal of the dynamic uplink grant mode into the x terminal and adjusts
Degree instructs, the last one orthogonal frequency-division for the subframe currently transmitted in second dispatch command comprising shortening terminal
The information of the cyclic prefix of multiplexed symbols；
The base station sends third tune by each terminal of the dynamic uplink grant mode into the y terminal
Degree instructs, first orthogonal frequency of first subframe comprising shortening terminal data frame to be transmitted in the third dispatch command
The information of the cyclic prefix of division multiplexing symbol；
Each terminal in the x terminal shortens the data frame of itself current transmission according to second dispatch command
Subframe the last one OFDM multi-channel multiplexing symbols cyclic prefix so that the subframe transmission duration reduce T3 when
It is long, wherein the T3 duration is greater than default third duration；
Each terminal in the y terminal shortens itself data frame to be transmitted according to the third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe, when so that the transmission duration of the subframe reducing T4
It is long, wherein the sum of the T3 duration and the T4 duration are greater than default 4th duration；
Each terminal in the y terminal carries out idle letter to the channel in the T3 duration and the T4 duration
Road assessment detection, and determine itself data frame to be transmitted；
Each terminal in the y terminal according to the terminal upload data frame for including in the authorization upload
Data frequency transmits itself identified data frame to be transmitted.
Specifically, the default third duration can be 4 microseconds, the 4th preset duration can be 9 microseconds.
Using embodiment illustrated in fig. 5 of the present invention, to the of first subframe of the data frame of pending transmitting uplink data
The last one orthogonal frequency-division of the cyclic prefix of one OFDM multi-channel multiplexing symbols and the subframe currently transmitted
The cyclic prefix of multiplexed symbols is shortened, and is currently being carried out to avoid within the cyclic prefix corresponding time of shortening
The terminal of transmitting uplink data carries out clear channel assessment (CCA) detection to other terminals and generates interference, and in other no interference sources
In the case where interference, other terminals are able to carry out transmitting uplink data, need not wait for the preconfigured subframe in base station and carry out letter
Road state-detection, and then reduce time delay, improves dispatching flexibility, and in the same time, multiple terminals can simultaneously into
Row transmitting uplink data reduces the waste of channel resource, improves channel resource utilization rate.Using RRC static configuration
It is interacted in the case that mode shortens CP, between base station and terminal simple, it is easy to accomplish；In the side using UL grant dynamic configuration
In the case that formula shortens CP, only in case of need, base station just notifies terminal to carry out the shortening of CP, reduces channel by it
The risk that his system occupies.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including one ... ", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
Those of ordinary skill in the art will appreciate that all or part of the steps in realization above method embodiment is can
It is completed with instructing relevant hardware by program, the program can store in computer-readable storage medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disk, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (4)
1. a kind of multiple terminals uplink dispatch method, which is characterized in that described applied to the network system based on license supplementary access
Network system includes N number of terminal and a base station, wherein N number of terminal shares a channel and the base station carries out data
It communicates, the authorization that the base station is directed to the terminal upload data frame, institute is obtained ahead of time in each terminal in N number of terminal
State include in authorization the terminal upload data frame upload data frequency, each terminal in N number of terminal is according to connecing
The authorization received, determine itself upload data frame starts the upload moment；
The method includes：
It is established after data communication connect in each terminal and the base station in N number of terminal, the base station is by wirelessly providing
Source control protocol sends the first dispatch command to the terminal, includes the shortening pending uplink of the terminal in first dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe of the data frame of data transmission and all subframes
The last one OFDM multi-channel multiplexing symbols cyclic prefix information；
The described terminal shortens the of the data frame of the pending transmitting uplink data of own terminal according to first dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of one subframe, so that the transmission duration of first subframe subtracts
Few T1 duration；
The described terminal shortens the institute of the data frame of the pending transmitting uplink data of own terminal according to first dispatch command
There is the cyclic prefix of the last one OFDM multi-channel multiplexing symbols of subframe, so that the transmission duration of first subframe is again
T2 duration is reduced, the transmission duration of other subframes in addition to first subframe reduces T2 duration, wherein the T2 duration
Greater than default first duration, the sum of the T1 duration and the T2 duration are greater than default second duration；
When there are the terminal is corresponding in next subframe corresponding period of the subframe of the data frame currently transmitted
When starting to upload the moment, shorten the corresponding T2 duration of cyclic prefix of subframe currently transmitted and the terminal shortens to
In the corresponding T1 duration of the cyclic prefix of first OFDM multi-channel multiplexing symbols of first subframe of the data frame of transmission,
The terminal carries out clear channel assessment (CCA) detection to the channel, and determines itself data frame to be transmitted；
The terminal according to the terminal upload data frame for including in the authorization upload data frequency, determined by transmission
Itself data frame to be transmitted.
2. a kind of multiple terminals uplink dispatch method, which is characterized in that described applied to the network based on license supplementary access technology
Network includes N number of terminal and a base station, wherein and N number of terminal shares a channel and the base station carries out data communication,
The authorization that the base station is directed to the terminal upload data frame is obtained ahead of time in each terminal in N number of terminal, described to award
It include the upload data frequency of the terminal upload data frame in power license, each terminal in N number of terminal is according to receiving
Authorization, determine itself upload data frame starts upload the moment；
The method includes：
The base station starts the upload moment according to each terminal, judges the next of the subframe of the data frame currently transmitted
When in a subframe corresponding period there are starting to upload the moment, determine x that is currently carrying out transmitting uplink data it is whole
Y terminal of end and pending transmitting uplink data, the y terminal are under the subframe of the data frame currently transmitted
It is existing in one subframe corresponding period to start to upload moment corresponding terminal；
The base station sends the second scheduling by each terminal of the dynamic uplink grant mode into the x terminal and refers to
It enables, the last one Orthodoxy Frequency Division Multiplex for the subframe currently transmitted in second dispatch command comprising shortening terminal
The information of the cyclic prefix of symbol；
The base station sends third scheduling by each terminal of the dynamic uplink grant mode into the y terminal and refers to
It enables, it is more comprising shortening first orthogonal frequency of first subframe of terminal data frame to be transmitted in the third dispatch command
The information of the cyclic prefix of road multiplexed symbols；
Each terminal in the x terminal shortens the son of the data frame of itself current transmission according to second dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of frame, so that the transmission duration of the subframe reduces T3 duration,
In, the T3 duration is greater than default third duration；
Each terminal in the y terminal shortens the first of itself data frame to be transmitted according to the third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of a subframe, so that the transmission duration of the subframe reduces T4 duration,
Wherein, the sum of the T3 duration and the T4 duration are greater than default 4th duration；
Each terminal in the y terminal carries out idle channel to the channel in the T3 duration and the T4 duration and comments
Estimate detection, and determines itself data frame to be transmitted；
Each terminal in the y terminal according to the terminal upload data frame for including in the authorization upload data
Frequency transmits respectively itself identified data frame to be transmitted.
3. a kind of network system based on license supplementary access, which is characterized in that including：
N number of terminal and a base station, wherein N number of terminal shares a channel and the base station carries out data communication；
The base station is directed to each terminal in N number of terminal in advance and sends the authorization for uploading data frame, the authorization
It include the upload data frequency of the terminal upload data frame in license；
Each terminal in N number of terminal obtains the authorization for uploading data frame for own terminal that the base station is sent and is permitted
Can, according to the authorization received, determine itself upload data frame starts the upload moment；
The base station sends the first dispatch command, institute by each terminal of the radio resource control into N number of terminal
First for stating first subframe of the data frame comprising the shortening pending transmitting uplink data of the terminal in the first dispatch command
The circulation of the cyclic prefix of OFDM multi-channel multiplexing symbols and the last one OFDM multi-channel multiplexing symbols of all subframes
The information of prefix；
The first terminal for first dispatch command that the base station is sent is received according to first dispatch command, is shortened certainly
First OFDM multi-channel multiplexing symbols of first subframe of the data frame of the pending transmitting uplink data of body terminal follow
Ring prefix, so that the transmission duration of first subframe reduces T1 duration；
The first terminal shortens the data frame of the pending transmitting uplink data of own terminal according to first dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of all subframes, so that the transmission duration of first subframe
T2 duration is reduced again, and the transmission duration of other subframes in addition to first subframe reduces T2 duration, wherein when the T2
Long to be greater than default first duration, the sum of the T1 duration and the T2 duration are greater than default second duration；
First terminal is stated when existing in next subframe corresponding period of the subframe of the data frame currently transmitted
It is corresponding when starting to upload the moment, shortening the corresponding T2 duration of cyclic prefix and described first of subframe currently transmitted
The cyclic prefix pair of first OFDM multi-channel multiplexing symbols of first subframe of the data frame to be transmitted that terminal shortens
In the T1 duration answered, the first terminal carries out clear channel assessment (CCA) detection to the channel, and determines itself number to be transmitted
According to frame；
The first terminal uploads the upload data frequency of data frame according to the first terminal for including in the authorization,
Itself data frame to be transmitted determined by transmitting.
4. a kind of network system based on license supplementary access, which is characterized in that including：
N number of terminal and a base station, wherein N number of terminal shares a channel and the base station carries out data communication；
The base station is directed to each terminal in N number of terminal in advance and sends the authorization for uploading data frame, the authorization
It include the upload data frequency of the terminal upload data frame in license；
Each terminal in N number of terminal obtains the authorization for uploading data frame for own terminal that the base station is sent and is permitted
Can, according to the authorization received, determine itself upload data frame starts the upload moment；
The base station starts the upload moment according to each terminal, judges the next of the subframe of the data frame currently transmitted
When in a subframe corresponding period there are starting to upload the moment, determine x that is currently carrying out transmitting uplink data it is whole
Y terminal of end and pending transmitting uplink data, the y terminal are under the subframe of the data frame currently transmitted
It is existing in one subframe corresponding period to start to upload moment corresponding terminal；
The base station sends the second scheduling by each terminal of the dynamic uplink grant mode into the x terminal and refers to
It enables, the last one Orthodoxy Frequency Division Multiplex for the subframe currently transmitted in second dispatch command comprising shortening terminal
The information of the cyclic prefix of symbol；
The base station sends third scheduling by each terminal of the dynamic uplink grant mode into the y terminal and refers to
It enables, it is more comprising shortening first orthogonal frequency of first subframe of terminal data frame to be transmitted in the third dispatch command
The information of the cyclic prefix of road multiplexed symbols；
Each terminal in the x terminal shortens the son of the data frame of itself current transmission according to second dispatch command
The cyclic prefix of the last one OFDM multi-channel multiplexing symbols of frame, so that the transmission duration of the subframe reduces T3 duration,
In, the T3 duration is greater than default third duration；
Each terminal in the y terminal shortens the first of itself data frame to be transmitted according to the third dispatch command
The cyclic prefix of first OFDM multi-channel multiplexing symbols of a subframe, so that the transmission duration of the subframe reduces T4 duration,
Wherein, the sum of the T3 duration and the T4 duration are greater than default 4th duration；
Each terminal in the y terminal carries out idle channel to the channel in the T3 duration and the T4 duration and comments
Estimate detection, and determines itself data frame to be transmitted；
Each terminal in the y terminal according to the terminal upload data frame for including in the authorization upload data
Frequency transmits itself identified data frame to be transmitted.
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| CN104486013A (en) * | 2014-12-19 | 2015-04-01 | 宇龙计算机通信科技(深圳)有限公司 | Channel detection method, channel detection system, terminal and base station |
| CN105050190A (en) * | 2015-08-14 | 2015-11-11 | 宇龙计算机通信科技(深圳)有限公司 | Method, device and base station for configuring discovery reference signal (DRS) based on unauthorized frequency band |
| CN105072690A (en) * | 2015-09-06 | 2015-11-18 | 魅族科技（中国）有限公司 | Unlicensed spectrum-based data transmission method and device |
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| CN104486013A (en) * | 2014-12-19 | 2015-04-01 | 宇龙计算机通信科技(深圳)有限公司 | Channel detection method, channel detection system, terminal and base station |
| CN105050190A (en) * | 2015-08-14 | 2015-11-11 | 宇龙计算机通信科技(深圳)有限公司 | Method, device and base station for configuring discovery reference signal (DRS) based on unauthorized frequency band |
| CN105072690A (en) * | 2015-09-06 | 2015-11-18 | 魅族科技（中国）有限公司 | Unlicensed spectrum-based data transmission method and device |
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