CN106792837A - A kind of up-downgoing changing method of TD LTE systems - Google Patents

A kind of up-downgoing changing method of TD LTE systems Download PDF

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Publication number
CN106792837A
CN106792837A CN201710098089.3A CN201710098089A CN106792837A CN 106792837 A CN106792837 A CN 106792837A CN 201710098089 A CN201710098089 A CN 201710098089A CN 106792837 A CN106792837 A CN 106792837A
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downlink
switching point
point position
link
special subframe
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CN106792837B (en
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张华�
孙采
夏子贤
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Southeast University
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Southeast University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Abstract

The invention discloses a kind of up-downgoing changing method of TD LTE systems, the method that the present invention detects joint-detection by envelope detection and CP, the detection of DwPTS length in the ratio of uplink subframe to downlink subframe and special subframe to TD LTE signals is realized step by step, so as to obtain TD LTE uplink and downlink of signals proportioning information, by counter search uplink downlink switching point, the accurate switching of uplink downlink is realized.While downlink handover point search in realization of the invention, the precision problem of envelope detection is solved, and complexity is low, it is easy to Project Realization.

Description

A kind of up-downgoing changing method of TD-LTE system
Technical field
The present invention relates to the up-downgoing changing method of wireless communication field, especially a kind of TD-LTE system.
Background technology
As people are continuously increased for the demand of wide-band mobile communication data service, LTE (Long Term Evolution) system has been widely deployed, and also during development development is in.According to the difference of duplex mode, LTE system is divided into the TD-LTE system of time division duplex and the FDD-LTE systems of FDD again.In TD-LTE system, on Line link and downlink operation in same frequency range, by time-multiplexed mode differentiating uplink and downlink.TDD system is compared to FDD One of clear superiority for system is that TDD system can flexibly carry out ratio of uplink subframe to downlink subframe setting, different to adapt to The need for the different scenes such as up-downgoing portfolio, covering, capacity, adjacent frequency coexistence.
Radio frames frame length in TD-LTE system is 10ms, including 10 isometric subframes, and each subframe includes 14 OFDM symbol.Subframe type includes downlink transfer subframe, uplink subframe and special subframe, TD-LTE signal frames up-downgoing Frame proportioning configuration is as shown in table 1.In table 1, downlink transfer subframe is represented with ' D '；Uplink subframe is represented with ' U '；It is special Subframe is represented with ' S '.Special subframe includes tri- kinds of special time slots of DwPTS, GP and UpPTS, and descending pilot frequency time slot is represented respectively, Protection interval, uplink pilot time slot.TD-LTE supports 7 kinds of uplink and downlink subframe proportionings, specific as shown in table 1；TD-LTE is also supported 9 kinds of special subframe configurations, it is specific as shown in table 2.When in special subframe DwPTS: GP: UpPTS be 10: 3: 1 when, frame structure as scheme Shown in 1.
Table 1：TD-LTE signal frames ratio of uplink subframe to downlink subframe is configured
Table 2：Special subframe configuration in TD-LTE signal frames
The up-downgoing switching of TD-LTE system, it is necessary to obtain the ratio of uplink subframe to downlink subframe information of above-mentioned TD-LTE signal frames with And DwPTS length informations in special subframe, then calculate the position of uplink downlink switching point.Usual user terminal needs to solve System information SIB1 can just obtain ratio of uplink subframe to downlink subframe.Terminal firstly the need of complete PSCH and SSCH synchronizations, and then by solution Adjust PBCH to obtain PHICH relevant informations, then obtain current area TDD time slot lattice after addressing the SIB1 that PDCCH is parsed on PDSCH Formula.The method complexity of this demodulating system information SIB is too high.The method of another envelope detection is carried because complexity is low Go out.Envelope detection method carries out power statistic by data, judges the time slot format of tdd frame.Though the method for this envelope detection Right complexity is low, but it cannot be guaranteed that switching position precision.
The content of the invention
Goal of the invention：To solve to obtain in the prior art the ratio of uplink subframe to downlink subframe information of TD-LTE signal frames and special DwPTS length informations complex steps and the relatively low technical problem of positional precision in subframe, the present invention propose a kind of TD-LTE system Up-downgoing changing method.This TD-LTE system up-downgoing changing method detects the side of joint-detection by envelope detection and CP Method, solves the precision problem of envelope detection, there is provided a kind of inexpensive, low implementation complexity, while ensuring the TD- of synchronization accuracy LTE up-downgoing changing methods.
Technical scheme：To realize above-mentioned technique effect, technical scheme proposed by the present invention is：
A kind of up-downgoing changing method of TD-LTE system, the method is comprised the following steps：
Step S1, the reception data to any one wireless frame length in the TD-LTE system are carried out in units of subframe Power statistic, judges the ratio of uplink subframe to downlink subframe of the radio frames；
Step S2, calculates DwPTS length in the special subframe of the radio frames；
Step S3, calculates in the radio frames downlink to the switching point position of up-link, including initial switching point Position and general switching point position, and downlink to uplink is completed on initial switching point position and general switching point position The switching on road；Wherein,
Downlink is to the computing formula of up-link initial switching point position：
In formula,Downlink is represented to up-link initial switching point position,Represent and obtained by main synchronous detection Symbol Timing position, N represents a length for OFDM symbol, NCPRepresent the length of CP, nDwPTSIn expression special subframe The number of DwPTS symbols；
Downlink is to the computing formula of the general switching point position of up-link：
In formula,Represent downlink to up-link generality switching point position；Represent contemporary downlink Descending switching point position is up to up-link generality the previous of switching point；nDwSubFrIt is special in representing the radio frames Different descending sub frame number between subframe and the previous sub-frame of uplink of the special subframe；
S4, the downlink obtained according to step S3 to the initial switching point position of up-link and general switching point position Put, calculate in the radio frames up-link to the switching point position of downlink, and cutting in up-link to downlink Change and up-link to the switching of downlink is completed on a position；The up-link is calculated to the switching point position of downlink Formula is：
In formula,Up-link is represented to the initial switching point position of downlink,Represent up-link to descending The general switching point position of link；nUpSubFrRepresent in the radio frames, special subframe is descending with latter of the special subframe Sub-frame of uplink number between subframe.
Further, DwPTS length in the special subframe of the radio frames is calculated in the step S2 to comprise the following steps：
Step S2-1, in special subframe, carries out power Data-Statistics in units of OFDM symbol, tentatively judges that DwPTS is long Degree；
Step S2-2, the boundary of the preliminary judged result obtained in step S2-1 carries out OFDM symbol CP detections, enters one Step is accurate to judge DwPTS length；
Step S2-3, M testing result of OFDM symbol CP detections of accumulation, if special subframe in this n times testing result Interior DwPTS length sequences are consistent, then judge that DwPTS length is obtained successfully in special subframe；Otherwise, return to step S2-1；M is pre- The detection number of times of the OFDM symbol CP detections for first setting.
Beneficial effect：, compared to the method that demodulation SIB obtains up-downgoing switching point position, cost is lower, complexity for the present invention Degree is lower, it is easier to Project Realization；Compared to the method that envelope detection judges up-downgoing switching point position, precision is higher.This hair Bright TD-LTE up-downgoings changing method is a kind of to realize that simple, cost of implementation is cheap and can ensure that the TD- of switching point positional precision LTE up-downgoing changing methods.
Brief description of the drawings
Fig. 1 is TD-LTE frame structure schematic diagrames；
Fig. 2 is embodiment of the present invention schematic flow sheet；
Fig. 3 is long by DwPTS in envelope detected and CP detection joint-detection judgement special subframes in the embodiment of the present invention The schematic flow sheet of degree；
Fig. 4 is the main synchronizing symbol timing position schematic diagrames of TD-LTE；
Fig. 5 is TD-LTE up-downgoing switching point position views.
Specific embodiment
The present invention is done below in conjunction with the accompanying drawings further is explained.
Embodiment of the present invention flow chart is illustrated in figure 2, the present embodiment is comprised the following steps：
Step S1, the reception data to a wireless frame length carry out power statistic in units of subframe, judge that this is wireless The ratio of uplink subframe to downlink subframe of frame.
Step S2, the method for detecting joint-detection by envelope detected and CP judges DwPTS length in special subframe, tool Body step is：
Step S2-1, in special subframe, carries out power Data-Statistics in units of OFDM symbol, tentatively judges that DwPTS is long Degree；
Step S2-2, the preliminary judgement boundary obtained in step S2-1 carries out OFDM symbol CP detections, more accurately sentences Determine DwPTS length；
Step S2-3, accumulates M effective detection result, if DwPTS length sequences one in this M times special subframe of detection Cause, then it is assumed that DwPTS length is obtained successfully in special subframe；Otherwise return to step S2-1, repeat step S2-1 to S2-3.
Step S3, system carry out first time downlink to up-link switching when, arrived according to downlink handover The initial switching point position calculating method of up-link obtains downlink to the initial switching point position of up-link, in system First time downlink is completed to after the switching of up-link, according to the general switching point of downlink handover to up-link Position calculating method obtains downlink to the general switching point position of up-link, and in initial switching point and general switching point The upper switching for completing downstream-to-upstream link.
The TD-LTE uplink and downlink of signals proportioning that the descending search for being switched to up initial switching point is obtained based on step S1 And DwPTS length in the special subframes that obtain of step S2.
Initial switching point position calculating method of the downlink handover to up-link：
Calculate from the main Symbol Timing position synchronously detected and obtainUp initial switching point position is switched to descending Time interval, set counter synchronously detect that the Symbol Timing position for obtaining starts counting up from main, until it is descending be switched to it is up Initial switching point.The Symbol Timing position that the main synchronous detection of note is obtained isOne OFDM symbol length (FFT sizes) is N, CP length is NCp, DwPTS symbol numbers are n in special subframeDwPTS, the switching point position of downstream-to-upstream isThey Calculation relational expression is as shown in Equation 1：
General switching point position calculating method of the downlink handover to up-link：
Note downstream-to-upstream generality switching point position isIt is previous to be up to descending switching point position and beShould DE descending sub frames number is n between special subframe and the previous sub-frame of uplink of the special subframe in TD-LTE signal framesDwSubFr, One FFT size of subframe is 30720 sampled points, then be up to descending general switching point position calculating formula as shown in Equation 2：
Step S4, the switching point from downlink handover to up-link is started counting up, and is calculated up-link and is switched to down The switching point of line link, and complete to be up to the switching of downlink in switching point.
On the TD-LTE signals that the calculating that above-mentioned up-link is switched to the switching point of downlink is obtained based on step S1 The downlink handover that DwPTS length and step S3 are obtained in the special subframe that descending proportioning, step S2 are obtained is to uplink The switching point position on road.The switching point position that each up-link is switched to downlink is calculated as follows：
Here remember that previous downstream-to-upstream switching point position isBeing up to descending switching point position isThe TD- Sub-frame of uplink number is n between special subframe and latter descending sub frame of the special subframe in LTE signal framesUpSubFr, one The FFT sizes of subframe are 30720 sampled points, are up to shown under descending switching point position calculating formula：
In formula,Up-link is represented to the initial switching point position of downlink,Represent up-link to descending The general switching point position of link；nUpSubFrRepresent in the radio frames, special subframe is descending with latter of the special subframe Sub-frame of uplink number between subframe.
The previous downlink that counter is switched to the switching point of downlink from the up-link of current search is set To the switching point of up-linkStart counting up, until reaching
As shown in figure 3, envelope detection and CP detection associated detecting methods judge DwPTS length in special subframe in the S2 Specifically include step：
Step S2-1, in special subframe, carries out power Data-Statistics in units of OFDM symbol, tentatively judges that DwPTS is long Degree；
Step S2-2, the preliminary judgement boundary obtained in step S2-1 carries out OFDM symbol CP detections, more accurately sentences Determine DwPTS length；
Step S2-3, accumulation n times effective detection result, if DwPTS length sequences one in the special subframe of this n times detection Cause then thinks that DwPTS length is obtained successfully in special subframe, otherwise returns to step S2-1 repeat steps S2-1 to S2-3.
Up-downgoing switching point position calculating method will be explained in detail according to Fig. 4 and Fig. 5 below.
Fig. 4 show the main synchronizing symbol timing position schematic diagrames of TD-LTE, the Symbol Timing position that main synchronous detection is obtained After the 3rd CP of DwPTS in special subframe.
It is illustrated in figure 5 TD-LTE up-downgoing switching point position views, the switching point position of up-link to downlink PutThe initial switching point position of downstream-to-upstream corresponding with itsDwPTS terminates it in same special subframe Afterwards,WithDistance be N+ (nDwPTS-3)·(NCP+ N), one of OFDM symbol length (FFT sizes) is N, CP length It is NCP, DwPTS symbol numbers are n in special subframeDwPTS。
Switching point of the downlink to up-linkInterval 30720nUpSubFr+[30720-nDwPTS·(NCP+ N)], Wherein nUpSubFrIt is sub-frame of uplink number, 30720 is a FFT size for subframe, [30720-nDwPTS·(NCP+ N)] represent special GP and UpPTS length sums in different subframe.Same method can be fromExtrapolate switching position next time
The up-downgoing switching point that TD-LTE up-downgoings changing method search of the invention is obtained in actual applications, can be appropriate Postpone multiple FFT sampling points and received with ensureing uplink and downlink signal integrity.
The above only expresses several embodiments of the invention, and its description is more specific and in detail, but can not be because This is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for those skilled in the art, not On the premise of departing from the principle of the invention, some improvements and modifications can also be made, these improvements and modifications also should be regarded as the present invention Protection domain.

Claims (2)

1. the up-downgoing changing method of a kind of TD-LTE system, it is characterised in that comprise the following steps：
Step S1, the reception data to any one wireless frame length in the TD-LTE system carry out power in units of subframe Statistics, judges the ratio of uplink subframe to downlink subframe of the radio frames；
Step S2, calculates DwPTS length in the special subframe of the radio frames；
Step S3, calculates in the radio frames downlink to the switching point position of up-link, including initial switching point position With general switching point position, and on initial switching point position and general switching point position complete downlink arrive up-link Switching；Wherein,
Downlink is to the computing formula of up-link initial switching point position：
t ^ D 2 U I n i t i a l = t ^ 0 + N + ( n D w P T S - 3 ) · ( N C P + N ) - - - ( 1 )
In formula,Downlink is represented to up-link initial switching point position,Represent the symbol obtained by main synchronous detection Number timing position, N represents a length for OFDM symbol, NCPRepresent the length of CP, nDwPTSRepresent DwPTS symbols in special subframe Number number；
Downlink is to the computing formula of the general switching point position of up-link：
t ^ D 2 U = t ^ U 2 D + 30720 · n D w S u b F r + n D w P T S · ( N C P + N ) - - - ( 2 )
In formula,Represent downlink to up-link generality switching point position；Represent contemporary downlink to up Link generality the previous of switching point is up to descending switching point position；nDwSubFrIn representing the radio frames, special subframe And the descending sub frame number between the previous sub-frame of uplink of the special subframe；
S4, the downlink obtained according to step S3 to the initial switching point position of up-link and general switching point position, meter Up-link is to the switching point position of downlink in calculating the radio frames, and in the switching point position of up-link to downlink Put the switching for completing up-link to downlink；Switching point position computing formula of the up-link to downlink For：
t ^ D 2 U I n i t i a l = t ^ D 2 U I n i t i a l + 30720 · n U p S u b F r + [ 30720 - n D w P T S · ( N C P + N ) ] - - - ( 3 )
t ^ U 2 D = t ^ D 2 U + 30720 · n U p S u b F r + [ 30720 - n D w P T S · ( N C P + N ) ] - - - ( 4 )
In formula,Up-link is represented to the initial switching point position of downlink,Represent up-link to downlink General switching point position；nUpSubFrIn representing the radio frames, latter descending sub frame of special subframe and the special subframe Between sub-frame of uplink number.
2. a kind of up-downgoing changing method of TD-LTE system according to claim 1, it is characterised in that the step S2 DwPTS length is comprised the following steps in the middle special subframe for calculating the radio frames：
Step S2-1, in special subframe, carries out power Data-Statistics in units of OFDM symbol, tentatively judges DwPTS length；
Step S2-2, the boundary of the preliminary judged result obtained in step S2-1 carries out OFDM symbol CP detections, further essence Really judge DwPTS length；
Step S2-3, M testing result of OFDM symbol CP detections of accumulation, if in this n times testing result in special subframe DwPTS length sequences are consistent, then judge that DwPTS length is obtained successfully in special subframe；Otherwise, return to step S2-1；M is advance The detection number of times of the OFDM symbol CP detections of setting.
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CN109802778B (en) * 2017-11-16 2020-09-29 华为技术有限公司 Method, device and system for indicating and determining time domain resources
CN110166205A (en) * 2018-02-14 2019-08-23 华为技术有限公司 A kind of method and apparatus of determining time slot format
CN110166205B (en) * 2018-02-14 2024-04-09 华为技术有限公司 Method and equipment for determining time slot format
CN111586868A (en) * 2020-04-29 2020-08-25 南京典格通信科技有限公司 TD-LTE system radio frequency power amplifier and low noise amplifier protection method

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