CN1953364B - A realization method for channel in multicarrier wave system cell - Google Patents
A realization method for channel in multicarrier wave system cell Download PDFInfo
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- CN1953364B CN1953364B CN200510109479A CN200510109479A CN1953364B CN 1953364 B CN1953364 B CN 1953364B CN 200510109479 A CN200510109479 A CN 200510109479A CN 200510109479 A CN200510109479 A CN 200510109479A CN 1953364 B CN1953364 B CN 1953364B
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
Abstract
The invention relates to a method for realizing channel in multi-carrier system. Wherein, in the region, keeping the frequency complex factor as 1; at the edge of region, using frequency group to reduce the interference between regions; setting distribution instruct channels at main and sub frequencies; the distribution instruct channel at main frequency distributes the main frequency, while the sub one distributes the sub frequency, to reduce the time domain resource, and reduce the main frequency resource for distribution instruct channel. And the mobile terminal can detect the distribution instruct channel based on itself occupied frequency, to reduce the load.
Description
Technical field
The present invention relates to multi-transceiver technology, be meant the channel implementation method in a kind of multicarrier wave system cell especially.
Background technology
Mobile communication technology needs type of service widely such as support voice, data, audio frequency, video, image, in order to support the multiple business type, require the higher data rate of mobile communication system support, higher spectrum efficiency, perfect service quality (QoS, Quality of Service) security mechanism, provide better mobility support and wireless network to cover, be embodied as the target that the user provides communication service whenever and wherever possible.At present, the mobile communication that has is with time division multiple access (TDMA, Time Division Multiple Access) and Narrowband CDMA (CDMA, Code Division Multiple Access) be main access technology, global mobile communication (GSM for example, Global System for Mobile Communication) system and CDMA IS-95 mobile communication system, the mobile communication that has is with wideband CDMA (WCDMA, Wide Code Division Multiple Access) be main access technology, for example universal mobile telecommunications system (UMTS, Universal Mobile Telecommunication System) and WCDMA mobile communication system.In CDMA technology, a user's data symbol will take all carrier frequency width, and different user or user data are distinguished by spreading code.Because multipath channel has been destroyed the orthogonality between the spreading code, makes CDMA technology become the system of a self-interference, therefore, power system capacity and spectrum efficiency can't satisfy the requirement of broadband wireless communications.
Multi-transceiver technology becomes the hot spot technology of broadband wireless communications gradually, its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and on a plurality of subcarriers, transmit data simultaneously, in the middle of the system applies of majority, the width of subcarrier is less than the relevant width of channel, on frequency-selective channel, the decline on each subcarrier is a flat fading, has so just reduced intersymbol interference like this, and do not need complicated channel equalization, be fit to the transmission of high-speed data.Multi-transceiver technology has various ways, as OFDM (OFDM, Orthogonal Frequency Division Multiplexing), CDMA multiple carrier (MC-CDMA, Multicarrier-Code Division Multiple Access), multicarrier is directly expanded CDMA (MC-DS-CDMA, Multicarrier-Direct Sequence-Code DivisionMultiple Access), multi-tone CDMA (MT-CDMA, Multitone-Code DivisionMultiple Access), multicarrier TDMA (MC-TDMA, Multicarrier-Time DivisionMultiple Access), the time-frequency domain two-dimensional expansion, and the multiple expansion technique on above basis.
The OFDM technology is more representational a kind of technology in the multi-transceiver technology, this technology is in frequency domain given channel to be divided into many orthogonal sub-channels, and allow subcarrier spectrum to overlap,, just can isolate data-signal from the subcarrier of aliasing as long as satisfy between subcarrier mutually orthogonally.
The OFDM technology never forms large-scale the application in the significant period of time after proposing, be much to be difficult to the problem that solves because the development of OFDM technology has run into, at first, the OFDM operation requires between each subcarrier mutually orthogonal, although in theory by fast fourier transform (FFT, Fast Fourier Transform) can realize this modulation system well, but in actual applications, according to the technological means that provided at that time, so complicated real-time Fourier transformation equipment can't realized at that time at all.In addition, the factors such as linearity requirement of the stability of transmitting oscillator and receiver oscillator and radio-frequency power amplifier also become the restriction condition that realizes the OFDM technology.Afterwards, the development of large scale integrated circuit technology had solved the problem of implementation of FFT, and along with the development of Digital Signal Processing (DSP, DigitalSignal Processing) technology, the OFDM technology begins to transform to practical application from theory.
The OFDM technology relies on its intrinsic focus that the stronger resistance of time delay expansion and higher spectrum efficiency two big advantages are become research rapidly, and adopted by a plurality of international norm, as European digital audio broadcast (DAB, Digital Audio Broadcast), Europe digital video broadcasting (DVB, DigitalVideo Broadcast), high performance radio local area network (HIPERLAN, High Performance LocalArea Network), Institute of Electrical and Electric Engineers (IEEE, Institute of Electrical andElectronics Engineers) 802.11 WLAN (wireless local area network), systems such as IEEE802.16 wireless MAN all adopt the OFDM technology.In third generation partner program (3GPP, 3rd Generation PartnershipProject) Radio Access Network (RAN, Radio Access Network) meeting, multi-transceiver technology becomes the access technology of main discussion.
Figure 1A shows user data transmission schematic diagram in the OFDM technology, shown in Figure 1A, user data at first passes through chnnel coding and interleaving treatment, and adopt some modulator approaches, as two-phase system phase shift keyed signal (BPSK, Binary Phase Shift Keying) modulation, four-phase shift key control signals (QPSK, Quaternary Phase Shift Keying) modulation, quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) etc. form symbol, operation being modulated on the radio frequency through OFDM then.In the OFDM operation, at first symbol is carried out the serial conversion, form the sub data flow of a plurality of low speed, each data flow takies a subcarrier; Sub data flow can pass through inverse discrete fourier transform (IDFT, Inverse Discrete Fourier Transform) or inverse fast fourier transform (IFFT, Inverse Fast Fourier Transform) realization to the mapping of subcarrier; Simultaneously the OFDM technology uses Cyclic Prefix (CP, Cyclic Prefix) as protection at interval, significantly reduces even has eliminated intersymbol interference, and guaranteed the orthogonality of each interchannel, thereby significantly reduced the phase mutual interference of interchannel.
After this, the technology that strong multi-carrier modulation combines with CDMA has appearred successively, usually these technology are divided into frequency domain expansion and time domain expansion two big classes at present, shown in Figure 1B, user data through chnnel coding, interweaving and modulate the back forms symbol, the symbol of formation carry out OFDM operate before the expansion of frequency domain or time domain.If only symbol is carried out frequency domain expansion, then be called MC-CDMA; If only symbol is carried out the time domain expansion, then is called MC-DS-CDMA; If frequency domain expansion and time domain expansion that symbol is carried out exist simultaneously, then be called the multi-transceiver technology of time-frequency domain two-dimensional expansion.
By above description as seen, the mapping of multicarrier realizes by IDFT or IFFT, and frequency spectrum overlaps each other and keeps quadrature between each subcarrier, and can overcome intersymbol interference by using Cyclic Prefix.In the OFDM technology, also can accelerate the attenuation outside a channel of subcarrier spectrum by the method for windowing, also exist some technological means to avoid using Cyclic Prefix.Like this, user data transmission is shown in Fig. 1 C in the multi-transceiver technology, user data at first passes through modulation treatment, this modulation treatment can comprise chnnel coding, interweaves, symbol-modulated and sequence of operations such as time domain and/or frequency domain expansion,, be mapped to a plurality of subcarriers with certain technological means and get on after having carried out the serial conversion by the data that obtain after the modulation treatment, these subcarriers can be quadrature, also can be non-orthogonally, and then be modulated to radio frequency and get on through parallel/serial.
Owing to is 1 in the interference-limited multiplexing factor of cdma system medium frequency, spectrum efficiency height so not only, and do not need to carry out frequency planning, simplified the network planning.But in multicarrier system, frequency duplex factor as one is 1 can not reach optimum spectrum efficiency, therefore, a kind of technical scheme of frequency soft multiplexing in being 200510067540.2 patent application, application number has been proposed, still the multiplexing factor of reserve frequency is 1 in inside, sub-district, then plan the interference that reduces between the sub-district at cell boarder, improve the communication quality and the spectrum efficiency of cell boarder by the frequency grouping.
Because down channel is together multiplexing according to certain rule by a plurality of users, and this multiplexing be time dependent. the base station need be notified to each portable terminal with this multiplexing rule by a dedicated channel, make portable terminal only to extract the information relevant and carry out demodulation with self, this dedicated channel can be called the scheduling indicating channel. the scheduling indicating channel is a multiple users share, therefore, need specify certain resource in advance for the scheduling indicating channel, for example, in multicarrier system, can allow the scheduling indicating channel take different subcarriers constantly at different symbols, like this, can obtain frequency diversity gain preferably, as shown in Figure 2, wherein the square of grey is that the scheduling indicating channel is in the shared resource of corresponding temporal symbol.
In the technical scheme of frequency soft multiplexing, the portable terminal that is positioned at cell edge and inside, sub-district all needs to use the scheduling indicating channel, therefore, the scheduling indicating channel need be placed on the more rare basic frequency, make it take basic frequency, promptly dispatch indicating channel and taking the basic frequency that the portable terminal that is positioned at cell edge takies.Yet taking different frequencies owing to be positioned at the portable terminal of cell edge with the portable terminal that is positioned at inside, sub-district, for the portable terminal that is positioned at cell edge, and be indifferent to the scheduling indication information that is positioned at inner 0 portable terminal in sub-district.But owing to have only a scheduling indicating channel that takies basic frequency, make the portable terminal that is positioned at cell edge that takies basic frequency also need demodulation simultaneously to be positioned at the scheduling indication information of the portable terminal of inside, sub-district, make very highly to taking of basic frequency, the load of portable terminal receiving scheduling indication information that is positioned at cell edge is also very high.
Summary of the invention
In view of this, the object of the present invention is to provide the channel implementation method in a kind of multicarrier wave system cell, reduce scheduling indicating channel taking basic frequency.
In order to achieve the above object, the invention provides the channel implementation method in a kind of multicarrier wave system cell, basic frequency and side frequency are set, this method also comprises steps A: the scheduling indicating channel is set respectively on basic frequency and side frequency, the scheduling indicating channel that takies basic frequency is used to dispatch basic frequency, and the scheduling indicating channel that takies side frequency is used to dispatch side frequency; Step B: portable terminal is monitored the scheduling indicating channel that takies corresponding frequencies according to self current frequency that takies.
Described step B is: portable terminal is monitored the scheduling indicating channel that takies basic frequency according to the current basic frequency that self takies.
Described step B is: portable terminal is monitored the scheduling indicating channel that takies side frequency according to the current side frequency that self takies.
Described step B is: portable terminal is monitored scheduling indicating channel that takies basic frequency and the scheduling indicating channel that takies side frequency simultaneously according to current basic frequency that self takies and side frequency.
Further comprise before the described step B: the current frequency that takies of base station notice portable terminal.
Occupy different subcarriers on described scheduling indicating channel each time symbol in a transmission time interval that takies basic frequency.
Occupy different subcarriers on described scheduling indicating channel each time symbol in a transmission time interval that takies side frequency.
According to the proposed method, the multiplexing factor of inner reserve frequency is 1 in the sub-district, when cell boarder is then planned the interference that reduces between the sub-district by the frequency grouping, the scheduling indicating channel is set respectively on basic frequency and side frequency, the scheduling indicating channel that takies basic frequency is used to dispatch basic frequency, the scheduling indicating channel that takies side frequency is used to dispatch side frequency, owing to be provided with different scheduling indicating channels respectively at basic frequency and side frequency, reduced the required running time-frequency resource of each scheduling indicating channel, the relative prior art of basic frequency resource of distributing to the scheduling indicating channel is significantly reduced.After being provided with different scheduling indicating channels respectively at basic frequency and side frequency, portable terminal can come the scheduling indicating channel that takies corresponding frequencies is monitored according to self current frequency that takies, and prior art has reduced the load of portable terminal receiving scheduling indication information relatively.
Description of drawings
Figure 1A shows user data transmission schematic diagram in the existing OFDM technology;
Figure 1B shows user data transmission schematic diagram in existing frequency domain/time domain expansion technique;
Fig. 1 C shows user data transmission schematic diagram in the existing multi-transceiver technology;
Fig. 2 shows existing scheduling indicating channel and take the subcarrier schematic diagram on the time symbol;
Fig. 3 shows among the present invention the scheduling indicating channel and take the subcarrier schematic diagram on the time symbol.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is provided with the scheduling indicating channel respectively on basic frequency and side frequency in the technical scheme of frequency soft multiplexing, the scheduling indicating channel that takies basic frequency is used to dispatch basic frequency, and the scheduling indicating channel that takies side frequency is used to dispatch side frequency.Whole frequency is divided into two sections, and one of them frequency range is as basic frequency, and another frequency range is as side frequency.Basic frequency can be applicable to the interior zone of sub-district, and side frequency can be applicable to the borderline region of sub-district, and like this, base station or portable terminal can be higher than in the transmitting power on side frequency in the transmitting power on the basic frequency.
Fig. 3 shows among the present invention the scheduling indicating channel and take the subcarrier schematic diagram on the time symbol, only illustrated that the scheduling indicating channel takies a kind of situation of subcarrier on the time symbol, abscissa shown in the figure is temporal symbol, ordinate is a frequency, whole frequency is divided into two sections of basic frequency and side frequencies, each fills the respective sub of square frame for taking of vertical line on corresponding time symbol, a scheduling indicating channel is set respectively on basic frequency and side frequency, as long as guarantee a transmission time interval (TTI, Transmission Time Interval) subcarrier that takies on Nei each time symbol is different to get final product, promptly take on scheduling indicating channel each time symbol in a TTI of basic frequency and take different subcarriers, take on scheduling indicating channel each time symbol in a TTI of side frequency and take different subcarriers.
After the scheduling indicating channel is set respectively on basic frequency and the side frequency, portable terminal can be according to self current frequency that takies, the scheduling indicating channel that takies corresponding frequencies is monitored, if the i.e. current basic frequency that takies of portable terminal, as be positioned at the portable terminal of cell edge and the portable terminal of high-speed mobile, then this portable terminal is monitored the scheduling indicating channel that takies basic frequency; If the current side frequency that takies of portable terminal, as be positioned at the portable terminal of inside, sub-district, then this portable terminal is monitored the scheduling indicating channel that takies side frequency; If current basic frequency and the side frequency of taking simultaneously of portable terminal, then this portable terminal is monitored simultaneously to scheduling indicating channel that takies basic frequency and the scheduling indicating channel that takies side frequency.
When connection of mobile terminal into network or occurrence positions moved, the base station can be according to its current frequency that takies of position informing portable terminal of portable terminal, and like this, portable terminal can be monitored correspondingly dispatching indicating channel according to self current frequency that takies.For example, the base station is a basic frequency according to the current frequency that takies of this portable terminal of position informing of portable terminal, and then this portable terminal is monitored the scheduling indicating channel that takies basic frequency; And for example, the base station is a side frequency according to the current frequency that takies of this portable terminal of position informing of portable terminal, and then this portable terminal is monitored the scheduling indicating channel that takies side frequency; For another example, the base station is basic frequency and side frequency according to the current frequency that takies of this portable terminal of position informing of portable terminal, and then this portable terminal is monitored simultaneously to scheduling indicating channel that takies basic frequency and the scheduling indicating channel that takies side frequency.
More than in the relevant description of the invention, the interior zone of sub-district and borderline region can be divided arbitrarily, for example, can will be that 50% the area dividing that center, radius are not more than radius of society is the interior zone of sub-district with the base station, be the borderline region of sub-district with other area dividing of this sub-district; Can will be that 60% the area dividing that center, radius are not more than radius of society is the interior zone of sub-district with the base station also, be the borderline region of sub-district with other area dividing of this sub-district; Can will be that 35% the area dividing that center, radius are not more than radius of society is the interior zone of sub-district with the base station also, be the borderline region of sub-district with other area dividing of this sub-district.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1. the channel implementation method that multicarrier wave system cell is interior is provided with basic frequency and side frequency, it is characterized in that this method also comprises:
A, the scheduling indicating channel is set respectively on basic frequency and side frequency, the scheduling indicating channel that takies basic frequency is used to dispatch basic frequency, and the scheduling indicating channel that takies side frequency is used to dispatch side frequency;
B, portable terminal are monitored the scheduling indicating channel that takies corresponding frequencies according to self current frequency that takies.
2. method according to claim 1 is characterized in that, described step B is: portable terminal is monitored the scheduling indicating channel that takies basic frequency according to the current basic frequency that self takies.
3. method according to claim 1 is characterized in that, described step B is: portable terminal is monitored the scheduling indicating channel that takies side frequency according to the current side frequency that self takies.
4. method according to claim 1 is characterized in that, described step B is: portable terminal is monitored scheduling indicating channel that takies basic frequency and the scheduling indicating channel that takies side frequency simultaneously according to current basic frequency that self takies and side frequency.
5. according to the arbitrary described method of claim 1 to 4, it is characterized in that, further comprise before the described step B: the current frequency that takies of base station notice portable terminal.
6. according to the arbitrary described method of claim 1 to 4, it is characterized in that, occupy different subcarriers on described scheduling indicating channel each time symbol in a transmission time interval that takies basic frequency.
7. according to the arbitrary described method of claim 1 to 4, it is characterized in that, occupy different subcarriers on described scheduling indicating channel each time symbol in a transmission time interval that takies side frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200510109479A CN1953364B (en) | 2005-10-20 | 2005-10-20 | A realization method for channel in multicarrier wave system cell |
| PCT/CN2006/002802 WO2007045185A1 (en) | 2005-10-20 | 2006-10-20 | A channel realizing method for multi-carrier system cell |
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| CN200510109479A CN1953364B (en) | 2005-10-20 | 2005-10-20 | A realization method for channel in multicarrier wave system cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8606289B2 (en) | 2008-11-10 | 2013-12-10 | Qualcomm Incorporated | Power headroom-sensitive scheduling |
| CN101808402B (en) * | 2009-02-12 | 2016-08-10 | 中兴通讯股份有限公司 | The acquisition methods of member carrier information and the receive-transmit system of member carrier information |
| CN101808065B (en) * | 2009-02-18 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for transmitting unicasting service control information |
| CN101841823B (en) * | 2009-03-16 | 2012-06-27 | 电信科学技术研究院 | Method and device for discontinuously monitoring control channels in multicarrier system |
| CN101932023B (en) * | 2009-06-19 | 2016-03-02 | 华为技术有限公司 | The discontinuous reception method of carrier aggregation, dispatching method and device |
| CN102291721A (en) * | 2010-06-18 | 2011-12-21 | 鼎桥通信技术有限公司 | Carrier configuring method for distributed system |
| CN103002453B (en) * | 2011-09-15 | 2016-08-03 | 华为技术有限公司 | The method and apparatus of area interference management |
| CN113472491B (en) * | 2020-03-30 | 2023-05-02 | 中国电信股份有限公司 | Data transmission method, information interaction device, base station and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357179A (en) * | 1999-04-19 | 2002-07-03 | 艾利森电话股份有限公司 | System and method for implementing multiple carriers in cellular networks |
| CN1358397A (en) * | 1999-06-28 | 2002-07-10 | 北方电讯网络有限公司 | Method for expanding channel capacity in mobile communications system |
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| CA2556948C (en) * | 2004-03-05 | 2011-01-18 | Samsung Electronics Co., Ltd. | Method and apparatus for allocating subcarriers in a broadband wireless communication system using multiple carriers |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357179A (en) * | 1999-04-19 | 2002-07-03 | 艾利森电话股份有限公司 | System and method for implementing multiple carriers in cellular networks |
| CN1358397A (en) * | 1999-06-28 | 2002-07-10 | 北方电讯网络有限公司 | Method for expanding channel capacity in mobile communications system |
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