CN106059978A - Frame structure and communication protocol of cellular mobile communication system under license-free frequency band - Google Patents
Frame structure and communication protocol of cellular mobile communication system under license-free frequency band Download PDFInfo
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- CN106059978A CN106059978A CN201610349283.XA CN201610349283A CN106059978A CN 106059978 A CN106059978 A CN 106059978A CN 201610349283 A CN201610349283 A CN 201610349283A CN 106059978 A CN106059978 A CN 106059978A
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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
- H04L27/2602—Signal structure
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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
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention discloses a frame structure and a communication protocol of a cellular mobile communication system under a license-free frequency band. The frame structure comprises a radio frame, half frames, sub frames, slots, and OFDM symbols. The 0th and fifth sub frames of the radio frame are special sub frames, and time-frequency resource configuration of the control channels in the special sub frames and four sub frame configurations in different uplink/downlink proportions are given. The communication protocol of the cellular mobile communication system under a license-free frequency band based on the frame structure is characterized in that a base station/user detects whether a channel is idle before accessing the channel. By using the technical scheme of the invention, services in different uplink/downlink proportions can be supported flexibly, synchronization, random access, transmission and other processes can be completed as soon as possible, the regulatory requirement that a base station/user in a license-free frequency band detects whether a channel is idle before accessing the channel can be supported, and the original LTE protocol is changed as little as possible.
Description
Technical field
The invention belongs to mobile communication technology field, be specifically related to a kind of exempt from cell mobile communication systems under licensed band
Frame structure and communication protocol.
Background technology
Exempt from Long Term Evolution (Long term evolution in unlicensed band, the LTE-U) skill of licensed band
Art is that tradition LTE is deployed to exempt from licensed band, thus promotes capacity of cellular networks, alleviates licensed band flow pressure.LTE-U
System is operated in exempts from licensed band, carries out downlink data transmission, faces multiple technical barrier: one is intended to meet International standardization group
Knit third generation partner program (3rd Generation Partnership Project, 3GPP) regulation, control signaling and
Data to complete transmission in having limit (such as 10ms or 13ms)；Two are intended to and WLAN (Wireless Local
Area Networks, WLAN) etc. use carrier sense, the coexistence of systems of exponential backoff access way, channel resource is discontinuous,
Access the channel moment uncertain, previous access channel terminate to the rear time time interval accessed between channel longer time, base station is wanted
Re-start synchronization, initiate the processes such as Stochastic accessing.Therefore, LTE-U system needs to complete synchronization etc. as early as possible after accessing channel
Process, it is impossible to simply continue to use frame structure and the communication protocol of tradition LTE system.
One of three kinds of use patterns as LTE-U system, the frame structure of LTE-U stand-alone mode (Standalone, SA)
Can not simply continue to use the frame structure of tradition LTE system.It is different from other both of which (to supplement downlink mode and carrier wave gathers
Syntype) auxiliary transmission control signaling can be carried out by licensed band, exempting from only to carry out in licensed band downlink data transmission, LTE-
Control signaling under U stand-alone mode and data will exempt from transmission, uplink/downlink business to be supported in licensed band.Further, LTE-U
Stand-alone mode to support to exempt from the laws and regulations requirement of licensed band, and not only base station but also user are intended to judge that channel is before accessing channel
The no free time.
The patent of Application No. WO 2015/054294 A2, for LTE-U system, uses clear channel assessment (CCA) (Clear
Channel Assessment, CCA) mode access channel, i.e. detect that channel idle just accesses, and correspondingly adjust
Maximum transmission power.Use this patented technology, then LTE-U system sends control signaling in licensed band, is only exempting from licensed band
Carrying out the data transmission of downlink business, base station can carry out CCA in special subframe, but user is not carried out before sending data
CCA。
In 3GPP TS 36.211 standard, LTE system time division duplex (Time Division Duplexing, TDD) class
The frame structure of type has three kinds of subframe type: descending sub frame, sub-frame of uplink and special subframe.Special subframe comprises descending pilot frequency time slot
(Downlink Pilot Time Slot, DwPTS), protection interval (Guard Period, GP), uplink pilot time slot
(Uplink Pilot Time Slot, UpPTS).LTE system TDD type have 7 kinds of uplink/downlinks (Uplink/Downlink,
UL/DL) sub-frame configuration.Although above-mentioned frame structure support uplink/downlink business, but only energy under the conditions of licensed band resource continuous print
Ensure that work is orderly.
Summary of the invention
For the above-mentioned technological deficiency existing for prior art, the invention provides one and exempt from honeycomb under licensed band and move
The frame structure of communication system and communication protocol, it is possible to support the business of different uplink/downlink ratio neatly, complete as early as possible to synchronize,
The process such as Stochastic accessing, transmission, supports that exempting from licensed band base station/user detects the regulation that channel is the most idle before accessing channel
Requirement.
A kind of exempting from the frame structure of cell mobile communication systems under licensed band, described frame structure uses radio frames (Radio
Frame), it is made up of the field (Half frame) that two durations are equal, and described field is by the equal subframe of five durations
(Subframe) composition, wherein first for special subframe in five subframes, remaining four are conventional subframe；Conventional cyclic prefix
Under each subframe by 14 OFDM (Orthogonal Frequency Division Multiplexing, OFDM)
Symbol forms；
Described conventional subframe comprises two the equal regular time slots of durations (Slot), and two regular time slots respectively take 7
OFDM symbol；
Described special subframe comprises descending pilot frequency time slot, protection interval, uplink pilot time slot and CCA period successively；
Wherein, descending pilot frequency time slot takies 10 OFDM symbol, and protection interval takies 1 OFDM symbol, and uplink pilot time slot takies 2
OFDM symbol, the CCA period takies 1 OFDM symbol.
Described radio frames has a following four sub-frame configuration:
(1) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st, 6 work song frames are sub-frame of uplink, the 2nd～4,7～No. 9
Subframe is descending sub frame；
(2) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st, 2,6,7 work song frames are sub-frame of uplink, the 3rd, 4,8,9
Work song frame is descending sub frame；
(3) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st～3,6～8 work song frames are sub-frame of uplink, the 4th, No. 9
Subframe is descending sub frame；
(4) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st～3,6～7 work song frames are sub-frame of uplink, the 4th, 8～9
Work song frame is descending sub frame.
Special subframe is arranged to the 0th, 5 work song frames by the present invention, so that send important after accessing channel as early as possible every time
Control signaling, complete the process such as synchronization, resident, initiation Stochastic accessing as early as possible；Sub-frame of uplink is arranged in and is next to special subframe
Uplink pilot time slot and after the CCA period, up-descending switching point can be reduced；Four kinds of sub-frame configuration can be supported neatly
The business of different uplink/downlink ratios.
No. 2 OFDM symbol carrying auxiliary synchronization channel in order to complete to synchronize as early as possible, in described special subframe
(Secondary Synchronous Channel, SSCH), No. 5 OFDM symbol carrying primary synchronization channel (Primary
Synchronous Channel, PSCH)；The above-mentioned arrangement of primary/secondary synchronizing channel and 3GPP TS 36.211 standard are about " same
Step signal and cell reference signals (Cell Reference Signal, CRS) do not conflict " arrangement compatible.
The the 6th～No. 9 OFDM symbol carrying Physical Broadcast Channel in order to complete cell searching as early as possible, in described special subframe
(Physical Broadcast Channel, PBCH).
In order to initiate Stochastic accessing as early as possible, the 11st～No. 12 OFDM symbol carrying physical accidental in described special subframe connects
Enter channel (Physical Random Access Channel, PRACH) and uplink reference signals (Sounding
Reference Signal, SRS).
On described special subframe, the position of each control channel is as follows:
Physical Control Format Indicator Channel (Physical Control Format Indicator Channel,
PCFICH) in No. 0 OFDM symbol being positioned in special subframe；Physical hybrid automatic repeat request indicator channel (Physical
Hybrid Automatic Repeat reQuest Indicator Channel, PHICH) be positioned in special subframe the 0th～
In No. 1 OFDM symbol；Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH) is positioned at spy
In the 0th～No. 1 OFDM symbol in different subframe；DSCH Downlink Shared Channel (Physical Downlink Shared Channel,
PDSCH) in the 2nd～No. 9 OFDM symbol being positioned in special subframe.
Because the duration accessing channel under LTE-U stand-alone mode is limited, in described Physical Random Access Channel every time
Random access lead code uses format4 form；Format4 random access lead code be shorter in length than connecing at random of other form
Enter lead code.
A kind of based on above-mentioned frame structure exempting from the communication protocol of cell mobile communication systems under licensed band, its feature is such as
Under:
User and base station, before accessing channel between the two, need to carry out CCA detection to channel, wherein:
If user is intended in the uplink pilot time slot of special subframe send random access lead code, then should be at this special subframe
Protection interval in first carry out CCA detection；
If user is intended on present sub-frame send data, then should carry out in last OFDM symbol of previous subframe
CCA detects；
For base station, its last OFDM symbol of last sub-frame of uplink before up-descending switching point is enterprising
Row CCA detects.
The beneficial effects of the present invention is: support exempting from licensed band channel resource discontinuously, access the channel moment the most true
Work under conditions of Ding；Supporting to exempt from the laws and regulations requirement of licensed band, it is the most empty that base station/user first detects channel before accessing channel
Not busy；The special subframe of application present invention design, can complete synchronizing process as early as possible and initiate the processes such as Stochastic accessing；Neatly
Support the business of different uplink/downlink ratios；Change to original LTE protocol is the least.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of LTE-U stand-alone mode of the present invention.
Fig. 2 is that the subframe of LTE-U stand-alone mode of the present invention arranges schematic diagram with the time-frequency controlling signaling.
Fig. 3 is the possible period schematic diagram of 3 times CCA of Configuration.
Fig. 4 is the synchronization schematic flow sheet under LTE-U stand-alone mode.
Fig. 5 is random access procedure schematic diagram based on competition under LTE-U stand-alone mode.
Detailed description of the invention
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and the detailed description of the invention technical side to the present invention
Case and relative theory are described in detail.
The frame structure of LTE-U stand-alone mode is as it is shown in figure 1, include: radio frames, field, subframe, time slot and OFDM symbol
Number.The radio frames of a length of 10ms is made up of the field of two a length of 5ms.Each field is by the subframe group of 5 a length of 1ms
Becoming, wherein 4 is conventional subframe, and 1 is special subframe.Conventional subframe is made up of the time slot of two long 0.5ms.Before regular circulation
Under sewing, each subframe is made up of 14 OFDM symbol.Special subframe includes: descending pilot frequency time slot, takies 10 OFDM symbol；Protect
Protect interval, take 1 OFDM symbol；Uplink pilot time slot, takies 2 OFDM symbol；The CCA period, take 1 OFDM symbol.
The important control channels such as primary synchronization channel, auxiliary synchronization channel, broadcast channel, Physical Random Access Channel are all arranged in special son
In frame.The most primary/secondary synchronizing channel carries on DwPTS time slot, and Physical Random Access Channel carries in UpPTS time slot.
Frame structure is identical with the frame structure of tradition LTE system TDD type at aspects such as layer architectures, thus as small as possible
Change original LTE protocol.But unlike the frame structure of tradition LTE system TDD type, in the frame structure of the present invention No. 0
It is special subframe with 5 work song frames, so that sending important control signaling after every time accessing channel as early as possible, complete as early as possible to synchronize,
The processes such as resident, initiation Stochastic accessing.
In order to complete to synchronize as early as possible, in the present invention, auxiliary synchronization channel is arranged in No. 2 OFDM symbol of special subframe, main same
Step channel is positioned at No. 5 OFDM symbol, and primary/secondary synchronizing channel respectively takies 72 subcarriers 1.08MHz bandwidth altogether.Primary/secondary synchronization
The above-mentioned arrangement of channel is held concurrently about the arrangement of " synchronizing signal is not conflicted with cell reference signals " with 3GPP TS 36.211 standard
Holding, because either single port, dual-port or four ports, cell reference signals does not all appear in the 2nd, 3,5,6,9,10,12
With in No. 13 OFDM symbol.Above-mentioned cell reference signals refers to be supplied to receiving terminal by transmitting terminal and estimates or channel for channel
A kind of known signal of detection.
In order to complete cell searching as early as possible, in the present invention, Physical Broadcast Channel is arranged in the 6th～No. 9 OFDM symbol of special subframe
Number, take 72 subcarriers 1.08MHz bandwidth altogether.
In order to initiate Stochastic accessing as early as possible, in the present invention, Physical Random Access Channel is arranged in special subframe the 11st and 12
OFDM symbol, takies 1.08MHz bandwidth.Random access lead code (Preamble) in the present invention uses format4 to connect at random
Enter lead code.This is because the duration accessing channel under LTE-U stand-alone mode is limited, and format4 random access lead code
It is shorter in length than the random access lead code of other form.
Special subframe configuration and time-frequency resource location are as in figure 2 it is shown, Physical Control Format Indicator Channel is positioned at No. 0 OFDM
On symbol, totally 4 PCFICH, each take 4 subcarriers.Physical hybrid automatic repeat request indicator channel be positioned at No. 0 and
No. 1 OFDM symbol, totally 3 PHICH, respectively take 4 subcarriers.Physical Downlink Control Channel is positioned at No. 0 and No. 1
OFDM, takies the subcarrier in addition to PCFICH and PHICH.DSCH Downlink Shared Channel is positioned at the 2nd～No. 9 OFDM symbol, takies and removes
952 subcarriers beyond 72 subcarriers around center frequency point.GP is positioned at No. 10 OFDM symbol, takies 1 OFDM symbol,
This is because the transmitting power exempting from each node of licensed band does not allow more than specified thresholds, sending out of LTE-U stand-alone mode base station
Penetrating power limited, its covering radius is less, and when its wireless signal is propagated between base station and cell edge, multi-path delay spread is less,
The GP of one OFDM symbol length be enough to anti-multipath jamming.The o.11 of special subframe and No. 12 are UpPTS time slot, are used for
Carrying random access lead code and uplink reference signals.No. 13 OFDM symbol of special subframe is used for carrying out CCA, by being adjusted
Spend the user's use sending data in next subframe.
For making LTE-U stand-alone mode support the business that uplink/downlink ratio is different neatly, and make up-descending, descending-
Up transfer point is less, and the sub-frame configuration (Configuration) in radio frames has 4 kinds, and (wherein " S " represents spy as shown in table 1
Different subframe, " U " represents sub-frame of uplink, and " D " represents descending sub frame).No. 0 is special subframe with the 5th work song frame, No. 1 and the 6th
Work song frame is sub-frame of uplink, and remaining subframe can be upstream or downstream subframe.The uplink/downlink subframe proportioning of Configuration 0
For U:D=2:6, up-descending switching point is between the 1st work song frame and the 2nd work song frame, and the 6th work song frame and the 7th work song frame
Between.The uplink/downlink subframe proportioning of Configuration 1 is U:D=4:4, and up-descending switching point is positioned at No. 2 and the 3rd
Between work song frame, and between No. 7 and the 8th work song frame.The uplink/downlink subframe proportioning of Configuration 2 is U:D=6:2,
Up-descending switching point is between No. 3 and the 4th work song frame, and between No. 8 and the 9th work song frame.Configuration
The uplink/downlink subframe proportioning of 3 is U:D=5:3, up-descending switching point between No. 3 and the 4th work song frame, and No. 7
And between the 8th work song frame.4 kinds of sub-frame configuration in table 1 are the most different from the sub-frame configuration in LTE system TDD type.
Table 1
Special subframe is arranged to the 0th work song frame by the present invention, can complete as early as possible synchronizing process, initiate Stochastic accessing waited
Journey；Sub-frame of uplink is arranged in and is next to the UpPTS time slot (ascending time slot) of special subframe and after the CCA period, can reduce on
Row-descending switching point.
It is real in the following manner that base station/user of the present invention detects channel this technical scheme the most idle before accessing channel
Existing:
According to exempting from the laws and regulations requirement of licensed band, base station and user first to judge that channel was the most empty before accessing channel
In the spare time, i.e. carry out CCA.Therefore, the user being intended to send PRACH on special subframe UpPTS utilizes the GP of special subframe to carry out CCA.
The user being intended to send data at present sub-frame carries out CCA in last 1 OFDM symbol of a upper subframe.Such as, exist
Configuration is scheduled in the 1st work song frame for 1 time and sends the user i last OFDM symbol at the 0th work song frame of data
Number carry out CCA, be scheduled in the 2nd work song frame and send the user j of data and carry out in last OFDM symbol of the 1st work song frame
CCA, and it is scheduled in No. 6 and the 7th work song frame continuously transmits the user k of data and accords with at last OFDM of the 5th work song frame
Number carry out CCA.Last OFDM symbol of the base station last sub-frame of uplink before up-descending switching point carries out CCA.
Such as, Configuration 3 times, base station carries out CCA in No. 3 and last OFDM symbol of the 7th work song frame.Fig. 3
For LTE-U stand-alone mode in the possible period of 3 times CCA of Configuration, used by user or base station respectively.
Setting up synchronization is that user to access significant process necessary to a cellular cell.After user's start, in several
Receive signal on heart frequency, found the community using this center frequency point by received signal strength, then start synchronizing process.
This technical scheme of synchronizing process in the present invention can use step as shown in Figure 4 to realize:
Step 41: do coherent detection by local Zadoff-Chu sequence.
The master sync signal of LTE-U stand-alone mode is made up of Zadoff-Chu sequence.Do by local Zadoff-Chu sequence
Coherent detection, finds the time location of master sync signal.
Step 42: determine No. 0 or the border of the 5th work song frame.
The primary synchronization channel of the present invention is positioned at special subframe (No. 0 and the 5th work song frame), and the master in the two subframe is same
Step signal is identical.The time location of the master sync signal found by step 41, determines No. 0 or the border of the 5th work song frame, such as figure
Shown in 2.
Step 43: do coherent detection by local M sequence.
The auxiliary synchronous signals of LTE-U stand-alone mode is made up of M sequence, with local M sequence and master sync signal time point it
Before the signal that receives do coherent detection, find the time location of auxiliary synchronous signals in this master sync signal place field.
Step 44: determine the border of radio frames.
The auxiliary synchronization channel of the present invention is positioned at special subframe (No. 0 and the 5th work song frame), and in the two subframe auxiliary with
Step signal differs.The time location of the auxiliary synchronous signals found by step 43, determines the border of radio frames.
By above description it can be seen that compared with tradition LTE system special subframe being arranged to the 1st work song frame, the present invention
Special subframe is arranged to the 0th work song frame so that just can send master sync signal and auxiliary accessing the first subframe after channel
Synchronizing signal, it is thus possible to complete synchronizing process as early as possible.
This technical scheme of random access procedure in the present invention can realize in the following way:
Random access procedure can be divided into Stochastic accessing based on competition and based on non-competing Stochastic accessing.LTE-U is independent
Under pattern, random access procedure based on competition is as shown in Figure 5.In the first time handshake procedure of Stochastic accessing, initiate calling
User sends message Msg1, i.e. format 4 random access lead code in UpPTS time slot.After receiving Msg1, base station is descending
In subframe give user feedback message Msg2, including backoff parameter, uplink lead, for message Msg3 distribution up
The parameters such as transmission running time-frequency resource numbering and interim C-RNTI (Cell Radio Network Temporary Identifier/Identity, Cell-RNTI).After user receives Msg2,
Enter second handshake process.User sends upstream message Msg3 in sub-frame of uplink, comprises user and uniquely identifies and data.Base
Stand reception Msg3 after at descending sub frame feedback message Msg4.After user receives Msg4, therefrom decode the parameters such as C-RNTI.
Compared with tradition LTE system special subframe being arranged in the 1st work song frame, the 0th work song frame of the present invention is special son
Frame, in the first subframe after accessing channel, user just can send random access lead code, can initiate Stochastic accessing as early as possible
Process.
Based in non-competing random access procedure, certain sub-frame of uplink that user specifies in base station or special subframe
Initiate Stochastic accessing in UpPTS time slot, i.e. send message Msg1.After receiving Msg1, base station gives user feedback in descending sub frame
Message Msg2.Compared to tradition LTE system, the 0th work song frame of the present invention is special subframe, thus first access after channel
Just can be with initiating random access procedure in subframe.
Data in the present invention are transmitted this technical scheme and can be realized in the following way:
In order to change original LTE protocol as small as possible, identical with tradition LTE system, carry out descending in descending sub frame
Transmission, is i.e. sent data by base station, carries out uplink, i.e. sent data by user in sub-frame of uplink.In the present invention, descending
Transmission can also be carried out in the DwPTS time slot of special subframe, uses 952 subcarriers, as shown in Figure 2.This is because 3GPP
Specify, when using conventional cyclic prefix, to join according to 0.75 times of conventional subframe when special subframe is for downlink data transmission
Put resource.Such as, when carrying a width of 20MHz, one the most front 3 OFDM symbol of conventional subframe can be used for controlling signaling transmission, accordingly
Behind ground, 11～13 OFDM symbol numbers can be used for data transmission, and its 0.75 times i.e. (14-3) * 0.75=8.25 (being 9 after rounding) is individual
OFDM symbol.And 10 OFDM symbol of DwPTS Time Slot Occupancy of special subframe of the present invention, more than 9 OFDM symbol of defined.
Such as carry out CCA in 1 time base station of Configuration and three users and data transmission scenarios is as shown in table 2.
Table 2 grey area is the period that base station/user carries out CCA before transmitting the data at the afterbody of previous subframe.Base station is spy
Different subframe and descending sub frame carry out data transmission；User i carries out data transmission at the 1st work song frame；User j enters at the 2nd work song frame
Row data are transmitted；User k carries out data transmission No. 6 and the 7th work song frame.
Table 2
Owing to the DwPTS time slot of special subframe can carry out downlink transfer, this just ensure control signaling can send as early as possible,
Control process can efficiently utilize running time-frequency resource on the premise of starting as early as possible.
The scope of application of the present invention is including, but not limited to exempting from the LTE-U stand-alone mode of licensed band.Any radio communication system
System because being operated in the frame structure exempting from licensed band and use the present invention, or made within the spirit and principles in the present invention appoint
What amendment, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. exempt from the frame structure of cell mobile communication systems under licensed band for one kind, it is characterised in that: described frame structure uses nothing
Line frame, it is made up of the field that two durations are equal, and described field is made up of the subframe that five durations are equal, wherein five sons
In frame first for special subframe, remaining four are conventional subframe；Under conventional cyclic prefix, each subframe is by 14 OFDM symbol
Composition；
Described conventional subframe comprises two equal regular time slots of duration, and two regular time slots respectively take 7 OFDM symbol；
Described special subframe comprises descending pilot frequency time slot, protection interval, uplink pilot time slot and CCA period successively；Wherein,
Descending pilot frequency time slot takies 10 OFDM symbol, and protection interval takies 1 OFDM symbol, and uplink pilot time slot takies 2 OFDM
Symbol, the CCA period takies 1 OFDM symbol.
Frame structure the most according to claim 1, it is characterised in that: described radio frames has a following four sub-frame configuration:
(1) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st, 6 work song frames are sub-frame of uplink, the 2nd～4,7～9 work song frames
For descending sub frame；
(2) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st, 2,6,7 work song frames are sub-frame of uplink, the 3rd, 4,8,9 work songs
Frame is descending sub frame；
(3) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st～3,6～8 work song frames are sub-frame of uplink, the 4th, 9 work song frames
For descending sub frame；
(4) in radio frames, the 0th, 5 work song frames are special subframe, and the 1st～3,6～7 work song frames are sub-frame of uplink, the 4th, 8～9 work songs
Frame is descending sub frame.
Frame structure the most according to claim 1, it is characterised in that: No. 2 OFDM symbol carrying in described special subframe
Auxiliary synchronization channel, No. 5 OFDM symbol carrying primary synchronization channel.
Frame structure the most according to claim 1, it is characterised in that: the 6th～No. 9 OFDM symbol in described special subframe is held
Carry Physical Broadcast Channel.
Frame structure the most according to claim 1, it is characterised in that: the 11st～No. 12 OFDM symbol in described special subframe
Carrying Physical Random Access Channel and uplink reference signals.
Frame structure the most according to claim 1, it is characterised in that: on described special subframe, the position of each control channel is such as
Under:
In No. 0 OFDM symbol that Physical Control Format Indicator Channel is positioned in special subframe；Physical mixed HARQ
In the 0th～No. 1 OFDM symbol that instruction channel is positioned in special subframe；Physical Downlink Control Channel be positioned in special subframe
In 0～No. 1 OFDM symbol；In the 2nd～No. 9 OFDM symbol that DSCH Downlink Shared Channel is positioned in special subframe.
Frame structure the most according to claim 1, it is characterised in that: the described Stochastic accessing in Physical Random Access Channel
Lead code uses format4 form.
8. based on frame structure as described in claim 1～7 any claim exempt from cellular mobile communication under licensed band for one kind
The communication protocol of system, it is characterised in that:
User and base station, before accessing channel between the two, need to carry out CCA detection to channel, wherein:
If user is intended in the uplink pilot time slot of special subframe send random access lead code, then should be the guarantor of this special subframe
CCA detection is first carried out in protecting interval；
If user is intended on present sub-frame send data, then should carry out CCA inspection in last OFDM symbol of previous subframe
Survey；
For base station, it carries out CCA in last OFDM symbol of last sub-frame of uplink before up-descending switching point
Detection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610349283.XA CN106059978B (en) | 2016-05-23 | 2016-05-23 | Exempt from cell mobile communication systems and communication means under licensed band |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610349283.XA CN106059978B (en) | 2016-05-23 | 2016-05-23 | Exempt from cell mobile communication systems and communication means under licensed band |
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| CN106059978B CN106059978B (en) | 2019-05-07 |
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Cited By (3)
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| CN106059978B (en) | 2019-05-07 |
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