CN1255798A - Method for data transmission in radio communicating system - Google Patents
Method for data transmission in radio communicating system Download PDFInfo
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- CN1255798A CN1255798A CN 99123565 CN99123565A CN1255798A CN 1255798 A CN1255798 A CN 1255798A CN 99123565 CN99123565 CN 99123565 CN 99123565 A CN99123565 A CN 99123565A CN 1255798 A CN1255798 A CN 1255798A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2621—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using frequency division multiple access [FDMA]
-
- 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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
-
- 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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
- H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The method involves using a first frequency band (FB1) for data transmission according to the TDD technique, with the transmission directions separated by a switch-over point. A second and third frequency band (FB2,FB3) are used for the uplink and the downlink directions respectively. For FDD transmission in the uplink direction, a first channel structure is used. Transmission in the first frequency band in the downlink direction is continuous, using a second channel structure matched to the first channel structure.
Description
The present invention relates to have the method for transfer of data in a kind of radio communications system of combination of TDD and FDD transmission method.
In radio transmission system, data (for example language, pictorial information or other data) by electromagnetic wave through a radio interface transport.Radio interface is the connection that is related between a base station and the subscriber board, and wherein subscriber board can be the radio communication platform of travelling carriage or fixed-site.Wherein electromagnetic wave emission is carried out with carrier frequency, and carrier frequency is positioned on the frequency band that each system predesignates.For the radio communications system in future, other system in UMTS (omnipotent mobile communication system) or the 3rd generation for example, frequency arrangement is in being approximately the frequency band of 2000MHz.
This moment for the 3rd generation mobile radio communicaltions system, need a kind of TDD (time division duplex) and a kind of FDD (Frequency Division Duplexing (FDD)) pattern.For tdd mode, on first frequency band, should use customer separating method by a kind of combination of TDMA (time division multiple access) and CDMA (code division multiple access) for the uplink and downlink direction, wherein in the time slot of two transmission directions, use reducing of a kind of transmission with a kind of burst list type that disconnects transit time and big transmitted power.For fdd mode, give uplink and downlink direction (second and the 3rd frequency band) with different bandwidth assignment therein, use the CDMA customer separating method.The difference of two kinds of patterns is the feature that is transfer of data and channel architecture significantly.For this reason, need different receivers for two kinds of patterns.Though two kinds of patterns are with same bandwidth operation, 5MHz for example, having the encode expansion of (Spreizkode) of user's proprietary extensions itself is very inequality according to the CDMA customer separating method in two kinds of patterns.
Task of the present invention is propose a kind of method of transfer of data, and this method to be utilized the advantage of two kinds of patterns, yet but will reduce the complexity of the parts that participate in transfer of data.This task is to solve by the method with claim 1, promptly in radio communications system, between at least one base station and subscriber board through the data transmission method of a radio communications interface, therein according to the TDD transmission method, arranged first frequency band as transfer of data, wherein the transmission direction in first frequency band separates by at least one transfer point, according to the FDD transmission method, arranged second and the 3rd frequency band as transfer of data, wherein second frequency band is as up direction as down direction and the 3rd frequency band, for the FDD transmission method, down direction has utilized first channel architecture, wherein carry out continuously, utilized second channel architecture that is complementary with first channel architecture therein in the transmission of first frequency band down direction.The further structure of excellence of the present invention is by learning in the dependent claims.
According to the present invention's suggestion, first channel architecture that FDD transmission method down direction uses also can use on the TDD transmission method as a reference for this reason, and will use at down direction with second channel architecture that first channel architecture is complementary.Interference reduction between two kinds of patterns, and the total raising of transmission capacity.
Opposite with the TDD transmission method of suggestion up to now, as in the FDD transmission method, use a kind of continuous transmission.When continuous transmission, transmit on the contrary, abolished unexpected transmitted power variation with burst sequence mode.By abolishing the guard band between two burst sequences transmitting continuously before and after the down direction, improved transmission capacity.
Wherein excellent is, data component and channel measurement sequence alternate in a circular order in first and second channel architecture.Data component is subordinated to the different user platform and the channel measurement sequence is to be used as channel estimating by all subscriber boards.Do not have overlappingly between channel measurement sequence that is sent by base station and the data component, then the interference of disturbing when channel estimating and Data Detection keeps very for a short time.
Thereby avoided the shortcoming of system up to now.In a CDMA mobile radio system, a continuous test channel is arranged, as the channel estimating of each base station according to the IS-95 standard.This test channel (Pilotkanal) sends abreast with very little transmitted power and subscriber signal, like this since lasting time of interference long, up to enough good of the channel estimating of travelling carriage.In the W-CDMA mobile radio communicaltions system of having advised at present, each channel includes several, in time the test symbol (Pilotsymbol) of Qian Ruing.Because all channels are overlapping again on a frequency band, when channel estimating, must consider the interference between the different channels.Avoided this shortcoming according to the channel architecture of down direction of the present invention,, and carried out channel estimating in high quality because can be soon for all channels and two kinds of patterns.
In order to utilize the advantage that improves capacity (soft capacity (soft capacity)) flexibly, frequency band is the broadband, and data component is that extended coding with a kind of user and channel special use separates.
In the transmission of up direction in first frequency band is discontinuous, carries out in the time slot that is separated by guard band, and be arranged in time interval of one of subscriber board random access near the transfer point place this moment on first frequency band.Channel architecture in two kinds of patterns on up direction is distinguishing.
In order to improve the channel estimating on the subscriber board, preferably a plurality of channel measurement sequences are analyzed.This can be by taking all factors into consideration to improve the quality, when particularly slow the or transmission channel of user velocity can only change at leisure.Particularly can use interpolation method and extrapolation to a plurality of channel measurement sequences for fast user.Unnecessary in addition differentiation base station makes all base stations use different channel order.Advantage is, same channel measurement sequence is used at down direction in a plurality of base stations, yet the channel measurement sequence is with different encoding phase transmissions from the base station.At receiver side, when the subscriber board channel estimating, can use a circular correlation of the channel estimating of transmission channel and a plurality of base stations.In addition, the such channel measurement sequence with different coding phase place is a quadrature, is to be prerequisite with the base station synchronously to a certain degree temporal.
In order to reduce interference, when the data to transmission simultaneously detect, suggestion use according to the common detector (combined detector) of DE 41 21 356 A1 or according to the transversal filter of DE 19,747 454 to reduce the strongest interference signal.The subscriber board that can move in two kinds of patterns preferably uses a public detection algorithm for TDD and FDD transmission method.By the reasonable coordination of two kinds of transmission modes, a signal processing that is equal to basically is possible on subscriber board.
Embodiments of the invention are narrated further by means of accompanying drawing.
Wherein expression
A block diagram of accompanying drawing 1 mobile radio communication network,
The sketch of accompanying drawing 2 transfer of data,
The sketch of accompanying drawing 3CDMA transmission method,
A block diagram of accompanying drawing 4 transmitters,
Block diagram of accompanying drawing 5 receivers and
The sketch of the channel architecture of accompanying drawing 6TDD and FDD transmission method.
The radio communications system of expression in accompanying drawing 1, on its structure corresponding to a known GSM-mobile radio communication network, and mobile radio communication network is made up of a lot of mobile phone MSC of general bureau, mobile phone general bureau is interconnected into network mutually, and the inlet that is established to fixed network PSTN.The MSC of these mobile phone general bureaus is connected with a base station controller BSC separately at least in addition.Each base station controller BSC allows again to be connected with at least one base station BS.Such base station BS is a radio communication platform, the radio communication platform through a radio communications interface can with subscriber board, for example mobile station MS is set up radio communication and is connected.
Represented that on accompanying drawing 1 for example three radio communications connect, be used for transmission useful information and signaling information between three mobile station MSs and base station BS, the mobile station MS of wherein distributing to two data channel DK1 of a mobile station MS and DK2 and distributing to other is data channel DK3 and DK4 separately.Each data channel DK1 ... DK4 represents a subscriber signal.
OMC of operation-maintenance centre realizes the examination and maintenance function to mobile radio communication network and its parts.The functional characteristic of this structure is utilized according to radio communications system of the present invention; Yet the present invention can transfer in other the radio communications system.
If only analyze the radio communications interface between mobile station MS and the base station BS, then this transmission system can be represented with accompanying drawing 2.The basis pulses that transmitter will be modulated through a transmission channel is transferred to a receiver, and receiver is determined system-based impulse response, and and then in signal processor the data that are included in the modulation is detected.Transmitter and receiver can be realized in mobile station MS and base station BS respectively.
According to accompanying drawing 3 a plurality of basis pulses are combined into a symbol.Add that on basis pulses different phase places constitutes different symbols.A transmission channel is by same-sign, and a sequence of extended coding constitutes.Certain symbol is used on a transmission channel, and this symbol thereby be that channel is exclusive.And then a transmission channel is by a carrier frequency with additionally by a time slot representative.Preparing information transmitted is encoded by symbol-modulated.Amplitude between the symbol of following by two front and back of a channel-and/or phase change transmit data.In digital system, these are two harmonious variation possibilities at least.
For the special circumstances of CDMA transmission method, a chip is a basis pulses.Two different basis pulses, phase change of 180 ° by a chip shape in a kind of BPSK modulation constitutes.So for example 16 such chip combinations become a symbol, wherein the order of the selection of chip and chip has been stipulated an extended coding.
A kind of alternative possibilities is that for example 4 chip set are synthesized symbols.This is corresponding to the separation of the minimum in the W-CDMA transmission method.Thus, though fewer channel can distinguish, yet also only need fewer sampling for distinguishing channel.By fewer symbol beat, at transmitter and receiver textural smaller complexity appears also.
According to the transmitter on the accompanying drawing 4, be by an encoder, a basis pulses generator, power amplifier and form with a coupler of transmission medium.Transmitter produces basis pulses in basis pulses sequence beat generator, basis pulses is transferred to coupler (antenna or acoustic emitter) through power amplifier.Depend on the data of preparing transmission in encoder, from the deposit of total operational basis pulses, selected that basis pulses is sent out away, and modulates that basis pulses with the index of modulation which type of is generally plural number.
Different transmission methods is distinguishing on the basis pulses deposit.Wherein can use one, a plurality of or a large amount of basis pulses.These basis pulses can be arbitrarily on their temporal extension, and are uncertain on the duration of basis pulses sequence beat.When basis pulses was longer than the one-period of basis pulses sequence beat, the overlapping of basis pulses appearred in transmitter.
In a signal conditioner of receiver, carry out following signal processing: amplify frequency inverted, analog filtering, A/D-conversion and digital filtering.Particularly total filtering characteristic of receiver continues to change the basis pulses of having been revised by transmission channel.Obtaining with basis pulses sequence beat at the output of digital filter is beat, a system-based impulse response sequence.The system-based impulse response sequence that this is overlapping is transfused to signal processing and wave detector.
The signal processing of receiver side is illustrated on the accompanying drawing 5 in the sketch mode.Signal processing comprises determines system-based impulse response, during measuring sequence, analyzing and processing determines the filter factor of at least one transversal filter, in one or more levels a transversal filter, detect the decoding of carrying section data and transversal filter output result of sampled value.Also can use a kind of Digital Signal Processing that is used for common detection selectively for transversal filter, as in DE 197 33860, using.The enforcement structure that basis pulses is selected and transversal filter is selected can be learned from Germany Patent document DE 197 47 454.The sort signal detection mode can be used in two transmission directions.
Accompanying drawing 6 has been represented the radio interface between the base station BS and mobile station MS in two kinds of transmission methods.At different frequency bands FB1, FB2, the transmission on the FB3 is synchronous mutually.Wherein use the frequency band that for example has the B=1.6MHz bandwidth.
When the TDD transmission method, utilize first frequency band FB1 not only to be used for down direction DL (from the base station BS to the mobile station MS) but also be used for up direction UL (from the mobile station MS to the base station BS), one of them transfer point separates transmission direction.When the FDD-transmission method, separate for the frequency band of two transmission directions.Utilize second frequency band and utilize the 3rd frequency band FB3 for down direction DL like this for up direction UL.
The data that two kinds of transmission methods will be prepared transmission are divided into the fr frame of same length.Alternatively, a kind of frame length of transmission method also can be the multiple of other frame length.In a fr frame when two kinds of transmission methods channel measurement sequence ma and data component da alternate.Wherein particularly the channel architecture in down direction DL is to coordinate mutually.
When the TDD-transmission method, be continuous at down direction DL, that is to say not to be what the burst list type sent.Following data component da a channel measurement sequence ma back.Channel measurement sequence ma can be used for the channel estimating of all mobile station MSs, and meanwhile each data component da is by the mobile station MS of distributing to each individually.
For two kinds of transmission methods and two transmission directions, a plurality of users' signal is simultaneously at a frequency band FB1, FB2, and the last transmission of FB3 is wherein distinguished by means of independent extended coding.Use a CDMA (code division multiple access) customer separating method subsequently, this method is by the subordinate relation of the variation of one or more extended codings or spreading coefficient, make the data rate that is connected between base station BS and the mobile station MS easily mutually coupling become possibility.
In the TDD transmission method, following a time interval in the transfer point back, and the time interval is moved platform MS and arbitrarily utilizes as requiring the access channel of resource allocation.Among the up direction UL, use a kind of transmission of burst list type in time slot, the radio program piece (Funkblock) that sends from mobile station MS comprises a channel measurement sequence ma separately between two data ingredient d a therein.Between the radio program piece, arranged transmission intercal, for the reasonable separability of received signals as guard band.
In the FDD transmission method, uplink and downlink direction UL, DL have the same and corresponding structure with TDD transmission method down direction DL.When continuous transmission, channel measurement sequence ma and data component da be alternate circularly.
In TDD and FDD transmission method, the same property of the channel architecture of down direction DL has been simplified the receiver architecture of mobile station MS, and mobile station MS is supported two kinds of transmission methods and use a kind of common detection algorithm.The part of a particular importance of receiver side signal analysis and processing is a channel estimating.Channel estimating is used as, the characteristic of channel of assessment radio communications interface and by selecting independent filter factor to set up a channel model, and model is made contributions for being corrected in data disturbed in the channel when Data Detection.Channel estimating is that carry out on the basis with channel measurement sequence ma, and its signal shape is predicted in receiver.
For the mobile radio communicaltions system of having represented on accompanying drawing 1, a plurality of adjacent base station BSs send same channel measurement sequence ma, and the channel measurement sequence comprises same chip sequence.Yet the beginning of the chip sequence of each transmission of the base station BS of these phase mutually synchronization has different encoding phases.Thereby at receiver side, might carry out channel estimating simultaneously to a plurality of base station BSs on mobile station MS, its method is to carry out a circular correlation with chip sequence.Produce a measurement window by circular correlation for each base station BS, this measurement window makes determines that dividually filter factor becomes possibility.
Interpolation is carried out in calculating to a plurality of channel measurement sequence ma, or carries out extrapolation when calculating fast, so that improve particularly the channel estimating for the mobile station MS of rapid movement.The channel measurement sequence ma that sends from base station BS has maximum transmitted power, and overlapping with data component da not, so that do not allow the distortion of the function aspects of channel estimating to occur.
Claims (12)
1. in radio communications system, between at least one base station (BS) and subscriber board (MS) through the data transmission method of a radio communications interface, therein
-according to the TDD transmission method, arranged first frequency band (FB1) as transfer of data, wherein the transmission direction in first frequency band (FB1) separates by at least one transfer point,
-according to the FDD-transmission method, arranged second and the 3rd frequency band (FB2, FB3) as transfer of data, wherein second frequency band (FB2) is to be to be used as up direction as down direction (DL) and the 3rd frequency band (FB3),
-for the FDD-transmission method, down direction (DL) utilizes first channel architecture,
It is characterized by,
Transmission at first frequency band (FB1) down direction (DL) is carried out continuously, has utilized second channel architecture that is complementary with first channel architecture therein.
2. according to the method for claim 1,
It is characterized by,
In first and second channel architecture, data component (da) and channel measurement sequence (ma) are alternate in a circular order, and wherein data component (da) is to be subordinated to different subscriber board (MS).
3. the method that one of requires according to aforesaid right,
It is characterized by,
(FB1, FB2 FB3) are the broadband to frequency band, and data component (da) is to separate with an extended coding that the user is independent or channel is independent.
4. the method that one of requires according to aforesaid right,
It is characterized by,
Transmission at first frequency band (FB1) up direction (UL) is discontinuous, be in the time slot that separates by guard band, carry out and
In first frequency band (FB1), near transfer point, arranged a time interval to be used for the arbitrary access of subscriber board (MS).
5. the method that one of requires according to aforesaid right,
It is characterized by,
From the base station (BS), channel measurement sequence (ma) is with maximum transmitted power and does not send overlappingly with data component (da).
6. the method that one of requires according to aforesaid right,
It is characterized by,
When channel estimating, go up a plurality of channel measurement sequences of use (ma) at a subscriber board (MS) and be used for determining transmission channel.
7. according to the method for claim 6,
It is characterized by,
When channel estimating, on a subscriber board (MS), carry out the interpolation and the extrapolation of a plurality of channel measurement sequences (ma) and calculate.
8. the method that one of requires according to aforesaid right,
It is characterized by,
A same channel measurement sequence (ma) is used at down direction (DL) in a plurality of base stations (BS), and channel measurement sequence (ma) is to be sent with different encoding phases by base station (BS).
9. according to the method for claim 8,
It is characterized by,
When channel estimating, go up to use a kind of circular dependency to be used to lead to the channel estimating of the transmission channel of a plurality of base stations (BS) at a subscriber board (MS).
10. the method that one of requires according to aforesaid right,
It is characterized by,
When detecting the data of transmission simultaneously, carry out a common detection, or carry out a horizontal filtering that reduces at least one interference signal of other base station.
11. according to the method for one of aforesaid right requirement,
It is characterized by,
On a subscriber board (MS), use a lot of detection algorithm of a kind of common ground for TDD and FDD transmission method.
12. according to the method for one of aforesaid right requirement,
It is characterized by,
Base station (BS) is the phase mutually synchronization in time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998151310 DE19851310A1 (en) | 1998-11-06 | 1998-11-06 | Data transmission method for radio communication system |
| DE19851310.0 | 1998-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1255798A true CN1255798A (en) | 2000-06-07 |
Family
ID=7886974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123565 Pending CN1255798A (en) | 1998-11-06 | 1999-11-08 | Method for data transmission in radio communicating system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1255798A (en) |
| DE (1) | DE19851310A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382609C (en) * | 2001-05-16 | 2008-04-16 | 株式会社Ntt都科摩 | Mobile communication system and base station and mobile terminal |
| CN101009514B (en) * | 2006-01-26 | 2011-04-06 | 中兴通讯股份有限公司 | A system and method for cooperative dual duplex |
| CN101237676B (en) * | 2007-02-02 | 2012-04-04 | 中兴通讯股份有限公司 | Terminal access method for TDD system |
| CN107196727A (en) * | 2016-03-14 | 2017-09-22 | 财团法人工业技术研究院 | Carry out data transmission method and the base station of full-duplex communication |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10053352A1 (en) * | 2000-10-27 | 2002-05-08 | Alcatel Sa | Procedure for allocating resources |
| SE0301063D0 (en) * | 2003-04-10 | 2003-04-10 | Upzide Labs Ab | A data communication system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2992670B2 (en) * | 1994-01-31 | 1999-12-20 | 松下電器産業株式会社 | Mobile communication device |
| US5812522A (en) * | 1995-03-31 | 1998-09-22 | Airtouch Communications, Inc. | Location-ruled radio-integrated network |
| DE19603443C1 (en) * | 1996-01-31 | 1997-07-10 | Siemens Ag | Code-modulated transmission method and a transmission system operating according to this transmission method |
-
1998
- 1998-11-06 DE DE1998151310 patent/DE19851310A1/en not_active Ceased
-
1999
- 1999-11-08 CN CN 99123565 patent/CN1255798A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382609C (en) * | 2001-05-16 | 2008-04-16 | 株式会社Ntt都科摩 | Mobile communication system and base station and mobile terminal |
| CN101009514B (en) * | 2006-01-26 | 2011-04-06 | 中兴通讯股份有限公司 | A system and method for cooperative dual duplex |
| CN101237676B (en) * | 2007-02-02 | 2012-04-04 | 中兴通讯股份有限公司 | Terminal access method for TDD system |
| CN107196727A (en) * | 2016-03-14 | 2017-09-22 | 财团法人工业技术研究院 | Carry out data transmission method and the base station of full-duplex communication |
| CN107196727B (en) * | 2016-03-14 | 2019-02-01 | 财团法人工业技术研究院 | Carry out data transmission method and the base station of full-duplex communication |
| US10547435B2 (en) | 2016-03-14 | 2020-01-28 | Industrial Technology Research Institute | Configuration and measurement method for performing a full-duplex communication and base station using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19851310A1 (en) | 2000-05-18 |
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