CN101621805A - Method for improving edge performance of wireless communication system - Google Patents
Method for improving edge performance of wireless communication system Download PDFInfo
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- CN101621805A CN101621805A CN200810039837A CN200810039837A CN101621805A CN 101621805 A CN101621805 A CN 101621805A CN 200810039837 A CN200810039837 A CN 200810039837A CN 200810039837 A CN200810039837 A CN 200810039837A CN 101621805 A CN101621805 A CN 101621805A
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Abstract
The invention discloses a method for improving the edge performance of a wireless communication system, which comprises the following steps: dividing each cell in a wireless communication network into a central region and a plurality of edge regions, wherein two small adjacent cells are adjacent in an edge region thereof; selecting all the frequencies in a useable frequency range to transmit signals with a user terminal of the central region in each cell; and selecting all the frequencies in a useable frequency range to transmit signals with user terminals of the edge regions in each cell, wherein the two adjacent edge regions of any adjacent regions select different frequencies and the transmitted signals with the user terminals in the edge regions contain multi-layer data at the same time and at the same frequency. The method can be used for solving the problem of unbalanced throughput of the central regions and the edge regions of the cell and can obtain frequency spectrum utilization rate similar to a shared-frequency network.
Description
Technical field
The present invention relates to improve in the wireless communication system cell edge region receptivity method, in order to realize center of housing estate zone and the equilibrium of cell edge region user throughput.
Background technology
Follow mobile network's extensive popularizing in the past twenty years such as GSM, global voice communication service has obtained great success.At present, Quan Qiu mobile voice user has surpassed 1,800,000,000.Simultaneously, our communication custom also evolves to the person to person from the past point-to-point (Place to Place).The fast development of personal communication has impelled greatly that the personal communication devices's is microminiaturized and diversified, in conjunction with the ability of data services such as Multimedia Message, game on line, video request program, music download and mobile TV, satisfied the demand of personal communication and amusement greatly.
At present, mobile radio system develops to broadband, portable direction, and communication terminal has been proposed high data bandwidth, low complex degree, low battery power consumption, and the requirement of spectral efficient.The use of OFDM/OFDMA technology has reduced the implementation complexity of wide-band communication system.
Orthogonal frequency division multiplexi, promptly the OFDM technology has been acknowledged as the first-selected transmission technology that surpasses three generations and four-tape WiMAX mobile communication.(Frequency division multiplex access FDMA), has just constituted the orthogonal frequency division multiplexing multiple access technology, i.e. the OFDMA technology at the multiplexing multiple access in the basic enterprising line frequency territory of OFDM.In common OFDMA technology, whole communication bandwidth is divided into many subcarriers, and it is right that each subcarrier can be distributed to certain sender-receiver separately, can be used for point-to-multipoint (point to multipoint, PMP) or point-to-point (point to point, P2P) communication system.Common cellular communication system is a point-to-multipoint communication system, single sender (such as the base station) can be simultaneously to one or more receivers (such as mobile phone) transmission information, one or more senders (such as mobile phone) also can be simultaneously to single receiver (such as the base station) transmission information, wherein a plurality of receivers or a plurality of sender take different subcarrier allocation orthogonal on the frequency domain respectively, become the OFDM/OFDMA system.The Long Term Evolution of typical application such as 3GPP (Long term evolution, LTE) down link of system.
Frequency-time resource that the sub-district of at present typical wireless communication system takies is consistent.
Mobile communication developed up to now 3 generation system, the 1st on behalf of the analog mobile communication system that adopts frequency division multiple access (FDMA), this system adopts very low frequency reuse, promptly multiplexing coefficient is much smaller than 1, as 7 cell frequency multiplexes, multiplexing coefficient is 1/7; The 2nd on behalf of digital mobile communication system, wherein adopts the digital mobile communication system of time division multiple access (TDMA), and as global system for mobile communications (GSM), its frequency reuse was greatly improved than the 1st generation, can reach 1/4～1/3; The 2nd code divides multiple access (CDMA) [1] system and the 3rd algebraically word mobile communication system, as Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, its frequency reuse can reach 1, this has improved the availability of frequency spectrum, reduced the cost of network design, therefore strengthen (E3G), the 4th generation (4G) mobile communication system for the 3G in future, it is 1 or higher frequency reuse that people still wish to adopt frequency reuse.
Along with the further investigation to technology of new generation such as OFDM (OFDM), multiple-input and multiple-output technology such as (MIMO), MIMO will become the basic fundamental of E3G, 4G with advantages such as its high message capacities.OFDM (OFDMA) is also approved by industry with its spectrum efficiency advantages of higher, and might be become the basic multiple access technology that E3G, 4G adopt.International Standards Organization's the 3rd third-generation mobile communication cooperation Long Term Evolution plan (3GPP LTE) is clear and definite in the E3G system, and the multiple access technology of down link will adopt OFDMA.Simultaneously, a large amount of research institutions show and do not re-use CDMA as basic multiple access technology, then use OFDMA as multiple access technology.And this multiple access technology based on frequency division multiple access of OFDMA has brought about the new challenge of channeling technology, if can not effectively solve the problem of many problem of inter-cell interference in the system that adopts the OFDMA technology and identical networking, raising frequency efficiency, will face the difficulty in the application based on E3G, the 4G system of OFDMA technology.
Adopt the network of same frequency-time resource to be called common-frequency network between the sub-district, a typical example as shown in Figure 1.Wherein, frequency-time resource 0 is adopted in sub-district 0, and frequency-time resource 1 is adopted in sub-district 1,3 and 5, and frequency-time resource 2 is adopted in sub-district 2,4 and 6.Under this frequency planning mode, frequency resource can not be utilized fully, and the availability of frequency spectrum of total system is the spectrum reuse rate (being the positive number less than 1) of single cell system availability of frequency spectrum, and promptly the availability of frequency spectrum of total system can have substantial degradation.
Adopt the network of same frequency-time resource to be called common-frequency network between the sub-district, a typical example is shown in Fig. 2 A.Wherein, sub-district 0-6 adopts identical frequency-time resource.In this case, the useful data transmission relative and Serving cell of the signal of the non-service emission in other sub-districts is interference.Consider the situation (as Fig. 2 B) of two sub-districts 0 and 1, establish the transmission of sub-district 0 for Serving cell emission useful data, sub-district 1 is launched interference signal for adjacent non-service cell on the same frequency resources of 0 useful data.According to the signal transmission theory, received signal with transmit between poor (path loss) become the inverse relation of power with transmission range, promptly distance is big more, path loss is also big more.For the nearer Cell Center User in distance base station (A), its distance service base station distance is near, and path loss is little, and the useful signal energy that receives is strong; It is apart from the non-serving base stations distance, and path loss is big, a little less than the interference signal energy that receives; In a word, this user to receive the performance (power ratio, signal to noise ratio with useful signal and interference signal are represented) of useful signal good.Simultaneously, for the nearer Cell Center User in distance base station (B), its distance service base station distance is far away, and path loss is big, a little less than the useful signal energy that receives; It is near apart from the non-serving base stations distance, and path loss is little, and the interference signal energy that receives is strong; In a word, this user receives the poor performance of useful signal.According to communication theory, user's channel capacity is proportional with the performance that receives useful signal.So under this cell plan arrangement, can there be very big difference in the capacity of Cell Center User and Cell Edge User.
Being suggested of soft fractional frequency reuse scheme provides a kind of approach that solves third generation mobile communication system channeling.Its basic thought is: existing sub-district is decomposed into central area and two parts of fringe region, adopt whole frequencies to carry out the signal transmission for the central area, and only adopt component frequency to carry out the frequency resource difference that signal transmits and adjacent fringe region adopts for fringe region.Fig. 3 is depicted as an example of this scheme, and the central area 01 of two sub-districts and 11 adopts whole frequencies to carry out the signal transmission, and it is different that fringe region 02 and 12 only adopts component frequency to carry out the frequency resource that signal transmission and adjacent fringe region adopt.So, can obtain to approach 1 frequency repeat utilization ratio, improve the availability of frequency spectrum of total system.Simultaneously, because the interference of edge customer is very little, improved the performance of its useful signal, the throughput that has reached Cell Center User and Cell Edge User is roughly balanced.
But, because fringe region adopts different component frequency planning modes, always reduce certain power system capacity, so total system still can't reach the availability of frequency spectrum of desirable Single Frequency Network technology.
Legacy communications system is the individual layer transmission system, each degree of freedom on transmission of one line signal in system, such as general single-carrier modulated complex baseband signal the transmission system of two degrees of freedom constituting by real part and imaginary part, each degree of freedom on transmission of one line signal; These two degrees of freedom can be called a multiple degree of freedom altogether.
At OFDMA, SC-FDMA and multi-band orthogonal frequency division multiplexing/multiple access (Multi-bandorthogonal frequency division multiple/access, MB-OFDM/A) in the system, system resource is divided into time, is assigned in these time after the information via coded modulation to be transmitted.After receiving terminal is received the time of appointment, can therefrom take out pilot frequency information usually, carry out the data message that coherent demodulation/channel decoding etc. obtains transmitting then.
In above-mentioned information transmission mode, on the time of appointment, only transmit a circuit-switched data usually, be called the individual layer transmission.
Fig. 4 A～Fig. 4 c has provided traditional individual layer communication system running time-frequency resource division principle figure, and wherein, whole time-frequency domain is divided into many time-frequency lattice points.Fig. 4 A shows that under the ofdma communication mode each time-frequency lattice point can be dispatched separately.Fig. 4 B shows that under the MB-OFDMA mode system is divided into two subbands at frequency domain.Fig. 4 C shows that frequency-region signal is arranged in a subband under the SC-FDMA mode.Here, each the time frequency correspondence a plural degree of freedom.
From Fig. 4 A～Fig. 4 c, as can be seen, only transmit one road signal on each plural degree of freedom in traditional communication system, be called one degree of freedom again.Under high SNR (signal noise ratio) situation, this individual layer transmission means is operated in the high SNR working point of channel capacity, and the getable capacity increment of every SNR of increase unit seldom.
Summary of the invention
For this reason, the present invention proposes a kind of method that improves edge performance of wireless communication system, the unbalanced problem of throughput that power system capacity by improving cell edge region and spectrum efficiency solve center of housing estate zone and fringe region.
The present invention proposes a kind of method that improves edge performance of wireless communication system, may further comprise the steps:
Each sub-district in the cordless communication network is divided into a central area and a plurality of fringe region respectively, and wherein two adjacent sub-districts are adjacent in zone, an edge separately;
Select for use the whole frequencies in the available frequency band to carry out the signal transmission with the user terminal that is arranged in the central area of each sub-district;
Select for use the component frequency in the available frequency band to carry out the signal transmission with the user terminal that is arranged in the fringe region of each sub-district, the frequency difference that two adjacent edge edge zones of wherein any two adjacent sub-districts are selected for use, and and the signal that between the user terminal of this fringe region, transmitted comprised multi-layer data at one time with in the same frequency.
In above-mentioned method, described signal at one time with same frequency in the multi-layer data that comprised have different signal to noise ratios.
In above-mentioned method, described signal at one time with same frequency in the multi-layer data that comprised have different coded systems, modulation system or power.
In above-mentioned method, also be included in a transmitting terminal and produce and describedly to comprise the signal of multi-layer data at one time with in the same frequency, the step of generation comprises:
Make the randomization of transmission data;
To transmit data and be divided into a plurality of layers;
Each layer transmission data are carried out coded modulation separately, and wherein each layer transmission data are used different coded system, modulation system or power;
Each layer transmission data after the weighted accumulation coded modulation;
The audio data when data after adding up are produced according to the running time-frequency resource mapping; And
Generate time-domain signal.
In above-mentioned method, also be included in a receiving terminal and recover described and comprise the signal of multi-layer data at one time with in the same frequency, the step of recovery comprises:
Receive time-domain signal;
Audio data when generating according to time-domain signal;
Audio data is carried out the hierarchical de-modulating ordering during to this;
Carry out a stratification step, to obtain at least one layer data;
Described at least one layer data is closed the road;
Data behind the involutory road are gone randomization, obtain final data information.
In above-mentioned method, the method for carrying out stratification step comprises counteracting serial interference.
In the method for the invention, the signal transmission manner comprises OFDMA, MB-OFDMA or SC-FDMA.
Therefore, a kind of method that improves edge performance of wireless communication system proposed by the invention, by on same running time-frequency resource, transmitting multi-layer data, when effectively utilizing system frequency resource, solve Cell Center User and Cell Edge User throughput imbalance problem, and obtained and frequently netted together the similar availability of frequency spectrum.
Description of drawings
Fig. 1 is existing a kind of common-frequency network schematic diagram that adopts same frequency-time resource.
Fig. 2 A is the existing another kind of common-frequency network schematic diagram that adopts same frequency-time resource.
Fig. 2 B is the center of housing estate in the existing common-frequency network and the capacity volume variance schematic diagram at edge.
Fig. 3 is existing a kind of soft fractional frequency reuse scheme schematic diagram.
Fig. 4 A～4C is that traditional individual layer communication system running time-frequency resource is divided schematic diagram.
Fig. 5 A～5C divides schematic diagram according to multilayer communication system running time-frequency resource of the present invention.
Fig. 6 is the multilayer transmission transmitting terminal structured flowchart according to the embodiment of the invention.
Fig. 7 is the multilayer transmission receiving terminal structured flowchart according to the embodiment of the invention.
Embodiment
The present invention is on the basis of soft fractional frequency reuse scheme, a kind of technology that proposes in order to improve the power system capacity and the availability of frequency spectrum.Now still with reference to shown in Figure 3, in a kind of soft fractional frequency reuse scheme, cordless communication network is divided into a plurality of sub-districts according to cellular, and 2 adjacent sub-districts 0,1 wherein only are shown among the figure.But what be understood that sub-district 0 easily also can have other neighbor cells on every side, and an example can be with reference to shown in Fig. 2 A.
According to a step of the present invention, each sub-district is divided into a central area and a plurality of fringe region respectively.For instance, sub-district 0 can be divided into a central area 01 and a plurality of fringe region (one of them area 02 in only indicating among the figure).Similarly, sub-district 1 is divided into a central area 11 and a plurality of fringe region (one of them zone 12 in only indicating among the figure).Two adjacent sub-districts 0,1 are adjacent at fringe region 02,12 places separately.Sub-district 0 also can be adjacent at the fringe region of other fringe regions that do not indicate and other neighbor cells.
According to another step of the present invention, cordless communication network selects for use the whole frequencies in the available frequency band to carry out the signal transmission with the user terminal that is arranged in the central area of each sub-district.For instance, when user A was positioned at the central area 01 of sub-district 0, cordless communication network can use whole available frequency band and user A to carry out the signal transmission, to reach maximum frequency repeat utilization ratio.
According to another step of the present invention, cordless communication network only selects for use the component frequency in the available frequency band to carry out signal transmission, the frequency difference that two adjacent edge edge zones of wherein any two adjacent sub-districts are selected for use with the user terminal that is arranged in the fringe region of each sub-district.The available frequency band of supposing network can be divided into frequency range G, F, in one embodiment, the user (as user B) who is arranged in edge cell 02 can use the part or all of frequency range of frequency range G, and the user who is arranged in edge cell 12 can use the part or all of frequency range of frequency range F.Therefore, can guarantee this two frequency resource differences that adjacent area adopted.More crucial spring silk because the signal to noise ratio in the edge region 02 is lower, thereby can adopt the multilayer transmission plan when network and the signal that transmitted between the user terminal that is positioned at this fringe region 02 (as user B).That is to say that signal has comprised multi-layer data in same running time-frequency resource (being same time and same frequency).
Dividing schematic diagram below in conjunction with the new multilayer communication system running time-frequency resource of Fig. 5 A～5C describes in detail.
With reference to Fig. 5 A～5C, shown three kinds of transmission meanss are corresponding OFDMA (OFDM), MB-OFDMA (multi-band orthogonal frequency division multiple access) and SC-FDMA (single-carrier frequency division multiple access) transmission means respectively.Contrast Fig. 4 A～4C as can be known, the present invention can be transmitted multi-layer data on same running time-frequency resource.With Fig. 5 A is example, and it is exemplary to show three layers of transmission, and more layer can be arranged in the reality, also can have only two-layer or one deck transmission.When transmitting, data need convert the signal that meets any one model among Fig. 5 A～Fig. 5 C in transmitting terminal (as network side or end side).The step that generates this signal roughly comprises: need the information transmitted data to carry out shunt through after the randomization, the data that shunt to each layer will be encoded respectively, modulate then, and are mapped to the layer of appointment.It is worthy of note that each layer is operated on the different signal to noise ratio (snr) levels in transmission course, promptly be operated on the different SNR working point of channel capacity.All things considered, these SNR working points can be less than having only one deck SNR working point in when transmission.By reducing the SNR working point, increase the transmission number of plies simultaneously, system can transmit multi-layer data on each multiple degree of freedom, increased power system capacity and spectrum efficiency greatly.
In addition, every layer data are absolute coding modulation.The coded modulation process can adopt different code checks, different modulation systems, perhaps adopts different power, thereby determines the SNR working point of each layer and the order of receiving terminal demodulation coding.
At receiving terminal (as end side or network side), signal demand reverts to original data message.The process of recovering roughly comprises: after receiving the time of appointment, take out the pilot signal of each layer correspondence, then according to the strong and weak of pilot tone or according to each layer data of transmitter named order demodulation coding.When demodulation ground floor data, the data of remainder layer are considered as disturbing; After demodulating the ground floor data, the recompile modulation recovers the received signal of ground floor, removes this restoring signal then from total received signal.Demodulation second layer data by that analogy, are all come out by demodulation coding up to the data of all layers then.
Delamination Transmission mode according to the present invention can be used in the point-to-point multiplexing transmission, also can be used in the multiplexing transmission of single-point to multiple spot, also can be used in the access transmission of multiple spot to single-point.
Be example with point-to-point multiplexing transmission below, at the Delamination Transmission implementation of transmitting terminal and receiving terminal.
Fig. 6 has provided the transmitting terminal of multilayer transmission plan and has realized block diagram.With reference to Fig. 6, have one to send control module 301 in the transmitting terminal, be responsible for the control and the coordination of each module in the transmitting terminal.
At first, information data is by data randomization module 302, will transmit the data randomization.
Afterwards, randomized data enter data hierarchy module 303 and carry out layering.
Data after the layering can enter independently code modulation module 304 respectively, and each layer data can be carried out coded modulation separately, and wherein each layer data can be used different coded systems, modulation system or power.
Each road coding modulation data can be weighted in weighted accumulation module 305 and add up afterwards.Data after adding up can be carried out the running time-frequency resource mapping at running time-frequency resource mapping block 306 together with the pilot signal that pilot tone insert module 308 is inserted.Carrying out time-domain signal by time-domain signal generation module 307 through the steps such as conversion of frequency domain to time domain then generates.Last signal is sent out away, enters transmission channel 340.
Fig. 7 shows the receiving terminal of multilayer transmission plan and realizes block diagram.Among Fig. 7, have one to receive control module 401 in the receiving terminal, be responsible for the control and the coordination of each module in the receiving terminal.
At first, come the aerial signal of self-channel 340 to receive by time-domain signal receiver module 402.
Then, the time-domain signal of reception can be when time-frequency data reception module 403 be transformed frequency domain and forms audio data.
Then, pilot extraction module 404 can therefrom be extracted pilot tone.Hierarchical de-modulating order module 405 can to the time audio data carry out the hierarchical de-modulating ordering.
Afterwards, carry out a stratification step in hierarchical block 540.A kind ofly realize that the example of layering is a counteracting serial interference.At first, received signal S1 obtains ground floor data D1 by demodulation coding module 4071, and S1 obtains S2 by the influence of Interference Cancellation module 4061 removal D1 then.Signal S2 obtains second layer data D2 by demodulation coding 4072 then, and S2 obtains S3 by the influence of Interference Cancellation module 4062 removal D2 then.By that analogy, by N-1 demodulation coding 407N-1 and Interference Cancellation module 406N-1, up to the signal SN that is only comprised the N layer data, 407N obtains N layer data DN by the demodulation coding module.
After all data Layer demodulation, enter data and close road module 408 and close the road, go randomization module 409 to go randomization in data then, obtain final data information.
Should be pointed out that above-mentioned demodulation coding module 407 and Interference Cancellation module 406 and repeatedly call operation just realize an example of hierarchical block 410.The present invention also can adopt other structure.
Should be noted also that in actual transmissions one deck in the multilayer transmission or which floor receiver can receive only.Especially, for the terminal that does not have complicated receiving ability, can receive only the ground floor data, and not use the Interference Cancellation function to obtain other layer data.And which floor other terminals with complicated receiving ability can transmit (send and/or receive) data in addition on.
It is above that what disclose is preferred embodiment of the present invention, but these embodiment are not in order to limit the present invention, any those skilled in the art, various equivalent modifications and the variation done without departing from the spirit and scope of the present invention all should be included in and work as with in the claim that claims were defined.
Claims (7)
1. method that improves edge performance of wireless communication system may further comprise the steps:
Each sub-district in the cordless communication network is divided into a central area and a plurality of fringe region respectively, and wherein two adjacent sub-districts are adjacent in zone, an edge separately;
Select for use the whole frequencies in the available frequency band to carry out the signal transmission with the user terminal that is arranged in the central area of each sub-district;
Select for use the component frequency in the available frequency band to carry out the signal transmission with the user terminal that is arranged in the fringe region of each sub-district, the frequency difference that two adjacent edge edge zones of wherein any two adjacent sub-districts are selected for use, and and the signal that between the user terminal of this fringe region, transmitted comprised multi-layer data at one time with in the same frequency.
2. the method for claim 1 is characterized in that, described signal at one time with same frequency in the multi-layer data that comprised have different signal to noise ratios.
3. method as claimed in claim 1 or 2 is characterized in that, described signal at one time with same frequency in the multi-layer data that comprised have different coded systems, modulation system or power.
4. the method for claim 1 is characterized in that, also is included in a transmitting terminal and produces and describedly to comprise the signal of multi-layer data at one time with in the same frequency, and the step of generation comprises:
Make the randomization of transmission data;
To transmit data and be divided into a plurality of layers;
Each layer transmission data are carried out coded modulation separately, and wherein each layer transmission data are used different coded system, modulation system or power;
Each layer transmission data after the weighted accumulation coded modulation;
The audio data when data after adding up are produced according to the running time-frequency resource mapping; And
Generate time-domain signal.
5. method as claimed in claim 4 is characterized in that, also is included in a receiving terminal and recovers described and comprise the signal of multi-layer data at one time with in the same frequency, and the step of recovery comprises:
Receive time-domain signal;
Audio data when generating according to time-domain signal;
Audio data is carried out the hierarchical de-modulating ordering during to this;
Carry out a stratification step, to obtain at least one layer data;
Described at least one layer data is closed the road;
Data behind the involutory road are gone randomization, obtain final data information.
6. method as claimed in claim 5 is characterized in that the method for carrying out described stratification step comprises counteracting serial interference.
7. the method for claim 1 is characterized in that, described signal transmission manner comprises OFDMA, MB-OFDMA or SC-FDMA.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014475B (en) * | 2010-01-08 | 2012-01-04 | 华为技术有限公司 | Resource mapping and code division multiplexing method and device |
| CN102801513A (en) * | 2010-01-08 | 2012-11-28 | 华为技术有限公司 | Resource mapping and code division multiplexing methods and devices |
| CN102883331A (en) * | 2011-07-11 | 2013-01-16 | 中国移动通信集团北京有限公司 | Network coverage method, base station, network accessing method, and base station |
| CN103269486A (en) * | 2013-04-19 | 2013-08-28 | 北京航空航天大学 | Air-ground data transmission method, device and system |
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2008
- 2008-06-30 CN CN2008100398371A patent/CN101621805B/en active Active
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| US9166720B2 (en) | 2010-01-08 | 2015-10-20 | Huawei Technologies Co., Ltd | Method and apparatus for resource mapping and code division multiplexing |
| US8315149B2 (en) | 2010-01-08 | 2012-11-20 | Huawei Technologies Co., Ltd. | Method and apparatus for resource mapping and code division multiplexing |
| CN102801513A (en) * | 2010-01-08 | 2012-11-28 | 华为技术有限公司 | Resource mapping and code division multiplexing methods and devices |
| US8553523B2 (en) | 2010-01-08 | 2013-10-08 | Huawei Technologies, Co., Ltd. | Method and apparatus for resource mapping and code division multiplexing |
| US8625403B2 (en) | 2010-01-08 | 2014-01-07 | Huawei Technologies Co., Ltd. | Method and apparatus for resource mapping and code division multiplexing |
| CN102014475B (en) * | 2010-01-08 | 2012-01-04 | 华为技术有限公司 | Resource mapping and code division multiplexing method and device |
| US9496977B2 (en) | 2010-01-08 | 2016-11-15 | Huawei Technologies Co., Ltd | Method and apparatus for resource mapping and code division multiplexing |
| CN102801513B (en) * | 2010-01-08 | 2017-08-04 | 华为技术有限公司 | Resource impact, code division multiplexing method and device |
| CN102883331A (en) * | 2011-07-11 | 2013-01-16 | 中国移动通信集团北京有限公司 | Network coverage method, base station, network accessing method, and base station |
| WO2013007192A1 (en) * | 2011-07-11 | 2013-01-17 | 中国移动通信集团北京有限公司 | Network coverage method and base station, and network access method and base station |
| CN102883331B (en) * | 2011-07-11 | 2014-12-31 | 中国移动通信集团北京有限公司 | Network coverage method, base station, network accessing method, and base station |
| CN103269486A (en) * | 2013-04-19 | 2013-08-28 | 北京航空航天大学 | Air-ground data transmission method, device and system |
| CN103269486B (en) * | 2013-04-19 | 2016-01-20 | 北京航空航天大学 | Air-ground data transmission and device, system |
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