CN106792837B - Uplink and downlink switching method of TD-LTE system - Google Patents

Uplink and downlink switching method of TD-LTE system Download PDF

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CN106792837B
CN106792837B CN201710098089.3A CN201710098089A CN106792837B CN 106792837 B CN106792837 B CN 106792837B CN 201710098089 A CN201710098089 A CN 201710098089A CN 106792837 B CN106792837 B CN 106792837B
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uplink
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special subframe
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CN106792837A (en
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张华�
孙采
夏子贤
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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

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Abstract

The invention discloses an uplink and downlink switching method of a TD-LTE (time division-Long term evolution) system, which realizes the detection of the uplink and downlink subframe ratio of a TD-LTE signal and the DwPTS length in a special subframe step by step through a method of envelope detection and CP detection combined detection, thereby obtaining the uplink and downlink ratio information of the TD-LTE signal, and realizing the accurate switching of an uplink and a downlink by counting and searching uplink and downlink switching points. The invention solves the precision problem of envelope detection while realizing the search of the uplink and downlink switching points, has low complexity and is easy to realize in engineering.

Description

Uplink and downlink switching method of TD-LTE system
Technical Field
The invention relates to the field of wireless communication, in particular to an uplink and downlink switching method of a TD-LTE system.
Background
With the increasing demand of people for broadband mobile communication data services, an lte (long termesolution) system has been widely deployed and is still in the process of development and development. According to the different duplex modes, the LTE system is divided into a TD-LTE system with time division duplex and an FDD-LTE system with frequency division duplex. In the TD-LTE system, an uplink and a downlink work in the same frequency band, and the uplink and the downlink are distinguished in a time division multiplexing mode. One of the obvious advantages of the TDD system over the FDD system is that the TDD system can flexibly perform configuration of uplink and downlink subframes to meet the needs of different scenarios such as different uplink and downlink traffic, coverage, capacity, and adjacent channel coexistence.
The radio frame length in the TD-LTE system is 10ms, and includes 10 subframes with equal length, and each subframe includes 14 OFDM symbols. The subframe types comprise downlink transmission subframes, uplink transmission subframes and special subframes, and the ratio configuration of the uplink subframes and the downlink subframes of the TD-LTE signal frame is shown in Table 1. In table 1, a downlink transmission subframe is denoted by 'D'; the uplink transmission subframe is denoted by 'U'; the special subframe is denoted by 'S'. The special subframe comprises three special time slots of DwPTS, GP and UpPTS, which respectively represent a downlink pilot time slot, a guard interval and an uplink pilot time slot. The TD-LTE supports 7 uplink and downlink subframe ratios, which are specifically shown in Table 1; TD-LTE also supports 9 special subframe configurations, as shown in table 2. When the DwPTS: GP: UpPTS in the special subframe is 10: 3: 1, the frame structure is as shown in FIG. 1.
Table 1: TD-LTE signal frame uplink and downlink subframe matching configuration
Figure BDA0001230752150000011
Table 2: special subframe configuration in TD-LTE signal frame
Figure BDA0001230752150000021
In uplink and downlink switching of the TD-LTE system, the uplink and downlink subframe ratio information of the TD-LTE signal frame and the DwPTS length information in the special subframe need to be obtained, and then the position of the uplink and downlink switching point is calculated. Usually, the ue needs to solve the system information SIB1 to obtain the uplink and downlink subframe ratio. The terminal firstly needs to complete PSCH and SSCH synchronization, then obtains PHICH related information by demodulating PBCH, and then addresses PDCCH to resolve SIB1 on PDSCH to obtain TDD time slot format of the current cell. This method of demodulating the system information SIB is too complex. Another method of envelope detection has been proposed because of its low complexity. The envelope detection method judges the time slot format of the TDD frame by carrying out power statistics on the data. This envelope detection method, although low in complexity, cannot ensure the switching position accuracy.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an uplink and downlink switching method of a TD-LTE (time division-Long term evolution) system, aiming at solving the technical problems that the steps for acquiring the uplink and downlink subframe proportioning information of a TD-LTE signal frame and the DwPTS length information in a special subframe are complicated and the position precision is low in the prior art. The TD-LTE system uplink and downlink switching method solves the problem of the precision of envelope detection through a method of envelope detection and CP detection combined detection, and provides the TD-LTE system uplink and downlink switching method which is low in cost and complexity and ensures synchronous precision.
The technical scheme is as follows: in order to achieve the technical effects, the technical scheme provided by the invention is as follows:
a method for switching between uplink and downlink of a TD-LTE system comprises the following steps:
step S1, carrying out power statistics on the received data of any wireless frame length in the TD-LTE system by taking a subframe as a unit, and judging the ratio of uplink and downlink subframes of the wireless frame;
step S2, calculating the DwPTS length in the special sub-frame of the wireless frame;
step S3, calculating the position of a switching point from the downlink to the uplink in the wireless frame, including the position of an initial switching point and the position of a general switching point, and completing the switching from the downlink to the uplink at the position of the initial switching point and the position of the general switching point; wherein the content of the first and second substances,
the calculation formula of the position of the initial switching point from the downlink to the uplink is as follows:
Figure BDA0001230752150000031
in the formula (I), the compound is shown in the specification,
Figure BDA0001230752150000032
indicating the downlink to uplink initial switch point location,
Figure BDA0001230752150000033
indicating the symbol timing position obtained by primary synchronization detection, N indicating the length of one OFDM symbol, NCPDenotes the length of the CP, nDwPTSRepresenting the number of DwPTS symbols in the special subframe;
the calculation formula for the downlink to uplink general switch point position is:
Figure BDA0001230752150000034
in the formula (I), the compound is shown in the specification,
Figure BDA0001230752150000035
indicating a downlink to uplink generic handoverA point position;
Figure BDA0001230752150000036
a previous uplink-to-downlink switch point location representing a current downlink-to-uplink generic switch point; n isDwSubFrRepresenting the number of downlink subframes between a special subframe and an uplink subframe before the special subframe in the wireless frame;
s4, according to the initial switch point position and the general switch point position from the down link to the up link obtained in the step S3, the switch point position from the up link to the down link in the wireless frame is calculated, and the switch from the up link to the down link is completed at the switch point position from the up link to the down link; the calculation formula of the position of the switching point from the uplink to the downlink is as follows:
Figure BDA0001230752150000037
Figure BDA0001230752150000038
in the formula (I), the compound is shown in the specification,
Figure BDA0001230752150000039
indicating the initial switch point position of the uplink to the downlink,
Figure BDA00012307521500000310
indicating a general switch point location for uplink to downlink; n isUpSubFrAnd indicating the number of uplink subframes between the special subframe and a downlink subframe behind the special subframe in the wireless frame.
Further, the step S2 of calculating the DwPTS length in the special subframe of the radio frame includes the following steps:
step S2-1, in the special subframe, taking OFDM symbol as unit to count the power value, and preliminarily judging the DwPTS length;
step S2-2, OFDM symbol CP detection is carried out at the boundary of the preliminary judgment result obtained in step S2-1, and the DwPTS length is further accurately judged;
step S2-3, accumulating the detection results of the M times of OFDM symbol CP detections, if the DwPTS length results in the special subframe in the N times of detection results are consistent, judging that the DwPTS length in the special subframe is successfully obtained; otherwise, returning to the step S2-1; m is the number of detections of the preset OFDM symbol CP.
Has the advantages that: compared with a method for acquiring the position of an uplink switching point and a downlink switching point by demodulating an SIB (system information interface), the method has the advantages of lower cost, lower complexity and easier engineering realization; compared with a method for judging the position of an uplink switching point and a downlink switching point by envelope detection, the method is higher in precision. The TD-LTE uplink and downlink switching method is simple to realize, low in cost and capable of ensuring the position accuracy of the switching point.
Drawings
FIG. 1 is a schematic diagram of a TD-LTE frame structure;
FIG. 2 is a schematic flow chart of an embodiment of the present invention;
FIG. 3 is a schematic flowchart illustrating a process of determining a DwPTS length in a special subframe by envelope detection and CP detection according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of TD-LTE primary synchronization symbol timing positions;
fig. 5 is a schematic diagram of a position of a TD-LTE uplink and downlink switching point.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in fig. 2, a flowchart of an embodiment of the present invention includes the following steps:
step S1, performing power statistics on the received data of a radio frame length in units of subframes, and determining the ratio of uplink and downlink subframes of the radio frame.
Step S2, determining the DwPTS length in the special subframe by a method of envelope detection and CP detection combined detection, which comprises the following steps:
step S2-1, in the special subframe, taking OFDM symbol as unit to count the power value, and preliminarily judging the DwPTS length;
step S2-2, OFDM symbol CP detection is carried out at the preliminary judgment boundary obtained in step S2-1, and the DwPTS length is more accurately judged;
step S2-3, accumulating M times of effective detection results, and if the DwPTS length results in the M times of detection in the special subframe are consistent, considering that the DwPTS length in the special subframe is successfully obtained; otherwise, returning to the step S2-1, the steps S2-1 to S2-3 are repeated.
Step S3, when the system performs the first downlink to uplink switching, the initial switching point position from the downlink to the uplink is obtained according to the initial switching point position calculation method for downlink to uplink switching, after the system completes the first downlink to uplink switching, the general switching point position from the downlink to the uplink is obtained according to the general switching point position calculation method for downlink to uplink switching, and the downlink to uplink switching is completed at the initial switching point and the general switching point.
The search of the initial switching point for switching downlink to uplink is based on the uplink and downlink ratio of the TD-LTE signal obtained in step S1 and the DwPTS length in the special subframe obtained in step S2.
The method for calculating the position of an initial switching point for switching a downlink to an uplink comprises the following steps:
calculating symbol timing position obtained from primary synchronization detection
Figure BDA0001230752150000051
And setting a counter to start counting from a symbol timing position obtained by main synchronous detection until the initial switching point of downlink switching to uplink. Noting the symbol timing position obtained by the primary synchronization detection as
Figure BDA0001230752150000052
One OFDM symbol length (FFT size) is N, CP length is NCpThe number of DwPTS symbols in the special subframe is nDwPTSThe switching point from the down line to the up line is set as
Figure BDA0001230752150000053
Their metersThe formula is shown in formula 1:
Figure BDA0001230752150000054
general switching point position calculation method for switching downlink to uplink:
recording the position of a downlink-uplink general switching point as
Figure BDA0001230752150000055
The previous uplink-downlink switching point is set as
Figure BDA0001230752150000056
The number of DE downlink subframes between a special subframe and an uplink subframe before the special subframe in the TD-LTE signal frame is nDwSubFrIf the FFT size of a subframe is 30720 sampling points, the calculation formula of the general switching point position from uplink to downlink is shown in equation 2:
Figure BDA0001230752150000057
step S4, counting from the switching point of downlink to uplink, calculating the switching point of uplink to downlink, and completing the uplink to downlink switching at the switching point.
The calculation of the switching point for switching from the uplink to the downlink is based on the uplink/downlink ratio of the TD-LTE signal obtained in step S1, the DwPTS length in the special subframe obtained in step S2, and the switching point position for switching from the downlink to the uplink obtained in step S3. The position of the switch point for each uplink switch to downlink is calculated as follows:
here, the previous downlink-to-uplink switching point position is recorded as
Figure BDA0001230752150000061
The position of an uplink to downlink switching point is set as
Figure BDA0001230752150000062
The TD-LTE signalThe number of the uplink subframes between the special subframe in the number frame and a downlink subframe behind the special subframe is nUpSubFrThe FFT size of a subframe is 30720 sample points, and the calculation formula of the position of the switching point from the uplink to the downlink is shown below:
Figure BDA0001230752150000063
Figure BDA0001230752150000064
in the formula (I), the compound is shown in the specification,
Figure BDA0001230752150000065
indicating the initial switch point position of the uplink to the downlink,
Figure BDA0001230752150000066
indicating a general switch point location for uplink to downlink; n isUpSubFrAnd indicating the number of uplink subframes between the special subframe and a downlink subframe behind the special subframe in the wireless frame.
Setting a counter from a downlink-to-uplink switching point previous to a currently searched switching point for switching from uplink to downlink
Figure BDA0001230752150000067
Starting to count until reaching
Figure BDA0001230752150000068
As shown in fig. 3, the method for joint detection of envelope detection and CP detection in S2 to determine the DwPTS length in the special subframe specifically includes the steps of:
step S2-1, in the special subframe, taking OFDM symbol as unit to count the power value, and preliminarily judging the DwPTS length;
step S2-2, OFDM symbol CP detection is carried out at the preliminary judgment boundary obtained in step S2-1, and the DwPTS length is more accurately judged;
and step S2-3, accumulating the valid detection results for N times, if the DwPTS length results in the special subframe detected for N times are consistent, the DwPTS length in the special subframe is considered to be successfully obtained, otherwise, returning to step S2-1 and repeating the steps S2-1 to S2-3.
The up-down switching point position calculation method will be explained in detail below with reference to fig. 4 and 5.
FIG. 4 is a schematic diagram of TD-LTE primary synchronization symbol timing position, symbol timing position obtained by primary synchronization detection
Figure BDA0001230752150000069
After the third CP of the DwPTS within the special subframe.
FIG. 5 is a schematic diagram of the position of an uplink/downlink switching point of TD-LTE, where the switching point is located from the uplink to the downlink
Figure BDA00012307521500000610
And the corresponding initial switching point position from downlink to uplink
Figure BDA00012307521500000611
After the DwPTS within the same special subframe is finished,
Figure BDA00012307521500000612
and
Figure BDA00012307521500000613
is N + (N)DwPTS-3)·(NCP+ N), where one OFDM symbol length (FFT size) is N, CP length is NCPThe number of DwPTS symbols in the special subframe is nDwPTS。
Downlink to uplink switching point
Figure BDA0001230752150000071
Interval 30720. nUpSubFr+[30720-nDwPTS·(NCP+N)]Wherein n isUpSubFrFor the number of uplink subframes, 30720 is the FFT size of one subframe, [30720-nDwPTS·(NCP+N)]Represents the sum of the GP and UpPTS lengths in the special subframe. Also, the same applies toCan be obtained from
Figure BDA0001230752150000073
Deducing the next switching position
Figure BDA0001230752150000072
In practical application, the uplink and downlink switching points searched by the TD-LTE uplink and downlink switching method can properly delay a plurality of FFT sampling points to ensure complete reception of uplink and downlink signals.
The foregoing merely illustrates several embodiments of the invention and is therefore described in some detail and not intended to limit the scope of the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (1)

1. An uplink and downlink switching method of a TD-LTE system is characterized by comprising the following steps:
step S1, carrying out power statistics on the received data of any wireless frame length in the TD-LTE system by taking a subframe as a unit, and judging the ratio of uplink and downlink subframes of the wireless frame;
step S2, calculating the DwPTS length in the special subframe of the radio frame, including steps S2-1 to S2-3:
step S2-1, in the special subframe, taking OFDM symbol as unit to count the power value, and preliminarily judging the DwPTS length;
step S2-2, OFDM symbol CP detection is carried out at the boundary of the preliminary judgment result obtained in step S2-1, and the DwPTS length is further accurately judged;
step S2-3, accumulating the detection results of the M times of OFDM symbol CP detections, if the DwPTS length results in the special subframe in the N times of detection results are consistent, judging that the DwPTS length in the special subframe is successfully obtained; otherwise, returning to the step S2-1; m is the detection times of the preset OFDM symbol CP detection;
step S3, calculating the position of a switching point from the downlink to the uplink in the wireless frame, including the position of an initial switching point and the position of a general switching point, and completing the switching from the downlink to the uplink at the position of the initial switching point and the position of the general switching point; wherein the content of the first and second substances,
the calculation formula of the position of the initial switching point from the downlink to the uplink is as follows:
Figure FDA0002373388530000011
in the formula (I), the compound is shown in the specification,
Figure FDA0002373388530000012
indicating the downlink to uplink initial switch point location,
Figure FDA0002373388530000013
indicating the symbol timing position obtained by primary synchronization detection, N indicating the length of one OFDM symbol, NCPDenotes the length of the CP, nDwPTSRepresenting the number of DwPTS symbols in the special subframe;
the calculation formula for the downlink to uplink general switch point position is:
Figure FDA0002373388530000014
in the formula (I), the compound is shown in the specification,
Figure FDA0002373388530000015
indicating downlink to uplink generic switch point locations;
Figure FDA0002373388530000016
a previous uplink-to-downlink switch point location representing a current downlink-to-uplink generic switch point; n isDwSubFrRepresenting the number of downlink subframes between a special subframe and an uplink subframe before the special subframe in the wireless frame;
s4, according to the initial switch point position and the general switch point position from the down link to the up link obtained in the step S3, the switch point position from the up link to the down link in the wireless frame is calculated, and the switch from the up link to the down link is completed at the switch point position from the up link to the down link; the calculation formula of the position of the switching point from the uplink to the downlink is as follows:
Figure FDA0002373388530000021
Figure FDA0002373388530000022
in the formula (I), the compound is shown in the specification,
Figure FDA0002373388530000023
indicating the initial switch point position of the uplink to the downlink,
Figure FDA0002373388530000024
indicating a general switch point location for uplink to downlink; n isUpSubFrAnd indicating the number of uplink subframes between the special subframe and a downlink subframe behind the special subframe in the wireless frame.
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