CN104168097A - Broadband wireless access system and signal transmission thereof and individual media service business method - Google Patents
Broadband wireless access system and signal transmission thereof and individual media service business method Download PDFInfo
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Abstract
The invention relates to a broadband wireless access system and signal transmission thereof and an individual media service business method, and belongs to the technical field of broadcast wireless communication. A system down link includes a information source encoder, a channel encoder, a constellation mapper and a TFU-OFDMA modulator which are connected in sequence at a base station end, and a TFU-OFDMA demodulator, a constellation inverse mapper, a channel decoder and an information source decoder which are connected in sequence at a terminal; and an up link includes an information source encoder, a channel encoder, an interleaver, a constellation mapper and a TFU-SCMA modulator which are connected in sequence at the terminal, and a TFU-SCMA demodulator, a constellation inverse mapper, a de-interleaver, a channel decoder and an information source decoder which are connected in sequence at the base station end. The transmission method adopts a TDD frame structure to realize time division duplex. The broadband wireless access system in the invention can very flexibly allocate wireless resources, support various channel environments and various business, and support wide area coverage in a high-speed mobile environment.
Description
Technical field
The invention belongs to broadband wireless communication technique field, relate to a kind of BWA and signal transmission thereof, operational approach.
Background technology
Along with interconnection agreement (Internet Protocol between the net of network, hereinafter to be referred as IP) change, broadband, mobile and the development trend of multi-business diversification and improving constantly of social life level, traditional, pure voice service can not meet people's demand, particularly along with the fast development of the Internet, people more wish to enjoy the communication service of multimedization, variation, personalization, and surging of data business volume makes people grow to even greater heights to the demand of communication bandwidth.Although optical fiber access has represented the direction of following broadband access, also there is certain inferior position in it.It is that cost is also higher that optical fiber accesses maximum problem, especially optical node from user more close to, the cost of access device that each user shares is just higher, and compared with wireless access network, Optical Access Network also needs conduit resource.The wireless access wide band technology arising at the historic moment, due to himself, is winning the favor of industry, and with respect to optical fiber access, wireless access wide band technology has following advantage:
(1) networking flexibility, networking are opened soon;
(2) upgrade maintenance is convenient;
(3) when user is closeer, cost is low;
(4) changed the traditional concept of local telecommunication business, be suitable for new Telecom Competition person most and carry out effective competition.This is that wired access network construction is subject to the restriction of objective condition because the common carrier newly coming into the market is not owing to possessing local network resource; And the optical fiber that has the operator of local network resource extensively to adopt adds the transmission means of copper cable, the broadband services of rapid growth is far from suitable, has restricted the development of business;
(5) feature movably, makes broadband wireless access can be used as the important supplement of telecommunications company's access in radio.
Although broadband wireless access has above advantage, can solve and access anywhere or anytime problem, improve the extensibility of existing network, but broadband wireless access has run into certain difficulty in the practical application of China and industry extension process, be mainly manifested in the BWA that lacks industry or aspect, field.Therefore, need research to build up the BWA in the fields such as Government information broadcasting, city public information issue (tourism, shopping, food and drink, parking), amusement broadcast and program request and city emergency multimedia communication (public security, fire-fighting).
Disclosed TFU-OFDMA downlink transmission technology and TFU-SCMA ul transmissions technology in Chinese patent [patent No. CN201010543952.X], its feature is, base station transmitting terminal adopts the OFDM access technology of time-frequency combination to carry out downlink multi-access access, obtains downstream signal; Adopt the single carrier multiple access technique of time-frequency combination to carry out uplink multi-address access at subscriber equipment transmitting terminal, obtain upward signal; Adopt time division duplex frame structure to carry out duplex transmission to downstream signal and upward signal.
Shared personal media services (the Personal Media Service of disclosed use content and channel strip in another part of Chinese patent application file [application number: 2006101676816], hereinafter to be referred as PMS) service technique, its feature is, set an authentication accounting server and an information dissemination management server, after user passes through to authentication accounting server request authentication by the middle low-speed bidirectional communication network channel of communication network, just the information that the Internet or radio network high-speed downstream broadcast channel transmit from information dissemination management server, retrieve, and send information requirement by low two-way communication network channel in described, information dissemination management server is received customer information requirement from authentication accounting server, just carry out information preparation and notify user scheduling scheme by descending common broadcast channel, in authentication accounting server, carry out charging control simultaneously.
Summary of the invention
The object of the invention is for advancing wireless access wide band technology, a kind of BWA and signal transmission and personal media services operational approach are proposed, the present invention is distributing radio resource neatly, support various channel circumstances and various multimedia, streaming media service, support the wide area under high-speed mobile environment to cover, and fully take into account the factors such as terminal cost, cost of serving and networking cost in industrialization, for provide cheap broadband data service to lay the first stone to user.
The BWA that the present invention proposes, is characterized in that: this system is made up of down link and up link, wherein, signal by base-station transmission to terminal be down link, signal is up link by terminal transmission to base station; Described down link comprise be arranged on base station end by side signal transmission to connected successively source encoder, channel encoder, constellation mapper and TFU-OFDMA modulator, be arranged on terminal by side signal transmission to connected successively TFU-OFDMA demodulator, constellation inverse mapping device, channel decoder and source decoder; The signal output part of the TFU-OFDMA modulator of described base station end is connected with the signal input part of the TFU-OFDMA demodulator of terminal by channel; Described up link comprises connected source encoder, channel encoder, interleaver, constellation mapper and the TFU-SCMA modulator successively that is arranged on terminal, connected TFU-SCMA demodulator, constellation inverse mapping device, deinterleaver, channel decoder and the source decoder successively that is arranged on base station end, the signal output part of the TFU-SCMA modulator of described terminal is connected with the signal input part of the TFU-SCMA demodulator of base station by channel.
Feature of the present invention and beneficial effect:
BWA (BRadio) that the present invention carries adopts disclosed TFU-OFDMA downlink transmission technology and TFU-SCMA ul transmissions technology in Chinese patent [CN201010543952.X], and combine Chinese patent application [
2006101676816] in use content and shared personal media services (Personal Media Service, hereinafter to be referred as the PMS) service technique of channel strip, build native system.
The present invention is distributing radio resource neatly, support various channel circumstances and various multimedia, streaming media service, support the wide area under high-speed mobile environment to cover, also fully take into account the factors such as terminal cost, cost of serving and networking cost in industrialization, for provide cheap broadband data service to lay the first stone to user.
Brief description of the drawings
Fig. 1 is the BRadio BWA block diagram that the present invention proposes.
Fig. 2 is the tdd frame structural representation that the present invention adopts.
Fig. 3 is the descending sub frame structural representation in the tdd frame that adopts of the present invention.
Fig. 4 is the sub-frame of uplink structural representation in the tdd frame that adopts of the present invention.
Embodiment
The present invention propose BRadio BWA by reference to the accompanying drawings and embodiment be described in detail as follows:
The BRadio BWA embodiment that the present invention proposes, as shown in Figure 1, it is characterized in that, this system is based on BRadio technology, formed by down link and up link, wherein, signal by base-station transmission to terminal be down link, signal is up link by terminal transmission to base station.Described down link comprise be arranged on base station end by side signal transmission to connected successively source encoder, channel encoder, constellation mapper and TFU-OFDMA modulator, be arranged on terminal by side signal transmission to connected successively TFU-OFDMA demodulator, constellation inverse mapping device, channel decoder and source decoder; The signal output part of the TFU-OFDMA modulator of described base station end is connected with the signal input part of the TFU-OFDMA demodulator of terminal by channel; Described up link comprise be arranged on terminal by side signal transmission to connected successively source encoder, channel encoder, interleaver, constellation mapper and TFU-SCMA modulator, be arranged on base station end by side signal transmission to connected successively TFU-SCMA demodulator, constellation inverse mapping device, deinterleaver, channel decoder and source decoder, the signal output part of the TFU-SCMA modulator of described terminal is connected with the signal input part of the TFU-SCMA demodulator of base station by channel.
Wherein, the information that the mode of the information source coding in source encoder can produce according to information source is selected flexibly, as Fano coding, and Shannon coding etc.; The mode of the chnnel coding in channel encoder can be convolution code (Convolutional Code, hereinafter to be referred as CC), low density parity check code (Low Density Parity Check, hereinafter to be referred as LDPC), Reed Solomon code (Reed Solomon, hereinafter to be referred as RS) etc.; Interleaver can be selected random interleaver etc.; Constellation mapping mode in constellation mapper can be Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, hereinafter to be referred as QPSK), 16 quadrature amplitude modulation (16-Quadrature Amplitude Modulation, hereinafter to be referred as 16QAM) and 64 quadrature amplitude modulation (64-Quadrature Amplitude Modulation, hereinafter to be referred as 64QAM).
Operation in constellation inverse mapping device, deinterleaver, channel decoder and source decoder is respectively the inverse operation of constellation mapper, interleaver, channel encoder and source encoder.
Signal transmission and the personal media services operational approach embodiment of the BRadio BWA that the present invention proposes are described in detail as follows:
The method for transmitting signals of the BRadio BWA that the present invention proposes, it is characterized in that, the method is included in signal transmission and the transmission of the signal in the up link two parts in down link, and, adopt tdd frame structure respectively downstream signal and upward signal to be carried out to time division duplex transmission.
The ascending-descending subframes frame length of the tdd frame that the present invention is 10ms at duration divides mixes, and proposes following four kinds of applicable allocative decisions:
(1) descending sub frame is 5400us, and sub-frame of uplink is 4320us, and guard time is 280us; (2) descending sub frame is 4320us, and sub-frame of uplink is 5400us, and guard time is 280us; (3) descending sub frame is 3960us, and sub-frame of uplink is 5760us, and guard time is 280us; (4) descending sub frame is 3600us, and sub-frame of uplink is 6120us, and guard time is 280us; Can carry out neatly the distribution of up-downgoing resource according to concrete traffic carrying capacity.
Described descending sub frame is made up of N TFU-OFDMA symbol; These TFU-OFDMA symbols are divided into common control information, downlink communication data and broadcast data three parts according to the information of its carrying; The system control message that common control information forms for the map information of the map information by transmission downlink communication data, uplink communication data, is positioned at descending sub frame foremost, takies N
1individual TFU-OFDMA symbol; Downlink communication data, after common control information, take N
2individual TFU-OFDMA symbol; Broadcast data is positioned at after downlink communication data, takies N
3individual TFU-OFDMA symbol; Above-mentioned N, N
1, N
2, N
3be positive integer, and N>=20,1≤N
1≤ 3,1≤N
2≤ N-N
1, N
3=N-N
1-N
2.
The described transmission of the signal at down link comprises: base station sends after will sending to the raw information of terminal by information source coding, chnnel coding, constellation mapping and TFU-OFDMA modulator, signal to be modulated, the receiving terminal that arrives down link via channel, the signal that the receiving terminal of down link receives carries out recovering raw information after demodulation, constellation inverse mapping, channel decoding and source decoding to signal by TFU-OFDMA modulator successively.
Described TFU-OFDMA modulator is modulated signal, specifically comprises the following steps:
(a) constellation mapping Hou Ge road user profile and pilot tone are mapped on corresponding data subcarrier and pilot sub-carrier, all data subcarriers are divided into multiple subchannels, the corresponding one or more subchannels of every road user profile; Protection subcarrier and direct current subcarrier set to 0; Pilot tone is carried out channel estimating and time synchronized for receiving terminal; Specifically comprise following:
(a1) set in advance the position of all kinds of subcarriers: all protection subcarriers are divided into left boundary belt and right boundary belt, and left boundary belt and right boundary belt lay respectively at the left and right two ends of frequency band; Direct current subcarrier is positioned at band center; Remaining data subcarrier and pilot sub-carrier are distributed between left and right boundary belt and direct current subcarrier; The total number N of data subcarrier and pilot sub-carrier
umeet: N
u=28L (L is positive integer), its allocation step is as follows:
A1-1) all data subcarriers and pilot sub-carrier are divided into 4L group continuously, each group comprises 6 data subcarriers and 1 pilot sub-carrier (pilot sub-carrier is positioned at the centre position of every group), and the call number of establishing group is i, i=0,1 ..., 4L-1;
A1-2) by an above-mentioned 4L component be L set (S
0, S
1... S
l-1), 4 groups of each set-inclusion, the corresponding call number S of each group in each set
l(k) be:
Wherein, S
l(k) represent that in l set, k organizes corresponding call number, l=0,1 ... L-1, k=0,1,2,3, sequence
the left cyclic shift of constant series that is L by length obtains for k time; The constant series that different length L is corresponding are as shown in table 1;
Constant series under table 1 different length
| Length L | Constant series |
| 6 | 234105 |
| 12 | 61741195831002 |
| 24 | 51822171119139617410233121415160822201 |
(a2) be S by call number in step (a1)
ldata subcarrier that (k) group of (k=0,1,2,3) comprises composition subchannel l (l=0,1 ... L-1); According to the schedule information of base station, Jiang Ge road user profile is mapped in one or more subchannels of appointment;
Subcarrier allocation of parameters in step (a) under different sub carrier sum M is as shown in table 2;
Table 2 subcarrier allocation of parameters
| Bandwidth of operation (MHz) | 2 | 4 | 8 |
| FFT length M | 256 | 512 | 1024 |
| Direct current sub-carrier indices I DC | 128 | 256 | 512 |
| Left boundary belt sub-carrier number N L | 44 | 88 | 176 |
| Right boundary belt sub-carrier number N R | 43 | 87 | 175 |
| Pilot sub-carrier is counted N p | 24 | 48 | 96 |
| Data subcarrier is counted N d | 144 | 288 | 576 |
| Sub-carrier number N in subchannel u | 24 | 24 | 24 |
| Number of subchannels L | 6 | 12 | 24 |
(b) all subcarriers of step (a) are carried out to inverse discrete Fourier transform, obtain time-domain signal (realization of inverse discrete Fourier transform can adopt the method for inverse fast Fourier transform with simplified operation complexity);
(c) generate a PN (pseudo noise) sequence, this PN (pseudo noise) sequence is filled to a protection intervening sequence in the mode of cyclic extensions, the time-domain signal of protecting intervening sequence and step (b) to obtain is merged, and be converted to serial data stream (being called a TFU-OFDMA symbol) transmission; TFU-OFDMA symbolic construction comprises protection interval and data block two parts; protection interval is above-mentioned protection intervening sequence; be made up of PN (pseudo noise) sequence and forward and backward expansion thereof, data block is the time-domain signal that step (b) obtains, and comprises data and pilot tone.
For the generation of above-mentioned PN (pseudo noise) sequence, a kind of embodiment can adopt linear feedback shift register to generate.The PN (pseudo noise) sequence generation method on 4 rank.Plus sige wherein represents mould 2 Hes, i.e. 0+0=0,0+1=1,1+0=1,1+1=0.Suppose register 1,2,3,4 initial condition is respectively 0,0,0,1, and can obtain output sequence by calculating is 1000100110101111000 ... can find out since the 16th, sequence repeats the output of the 1st.Be that this is that one-period is 15 periodic sequence.Get arbitrarily a segment length and be 15 sequence and be needed PN (pseudo noise) sequence.As get front 15 composition sequences 100010011010111.
Described TFU-OFDMA demodulator carries out demodulation to signal, and concrete steps are as follows:
(d) utilize the PN (pseudo noise) sequence in the protection interval of TFU-OFDMA symbol to carry out sign synchronization and carrier synchronization to the above-mentioned TFU-OFDMA symbol receiving, according to the symbol synchronization information obtaining, the protection interval in TFU-OFDMA symbol is separated with data block, obtain the protection interval and the data block that separate;
(e) above-mentioned data block is carried out to Fourier transform, obtain the frequency-region signal of TFU-OFDMA;
(f) in above-mentioned frequency-region signal, extract pilot tone, and utilize pilot tone to carry out channel estimating to current channel, according to this channel estimating, this frequency-region signal is carried out to channel equalization; Wherein, the algorithm of channel estimating and channel equalization can be selected algorithm known flexibly, for example, adopt channel estimation method and the Channel Equalization Algorithm that adopts zero forcing equalization based on least square method.
(g) frequency-region signal after above-mentioned equilibrium is carried out to subcarrier inverse mapping, recover each road user profile;
The signal transmission of described up link comprises: terminal will send to the raw information of base station successively by sending after source encoder, channel encoder, interleaver, constellation mapper and TFU-SCMA modulator, the receiving terminal that arrives up link via channel, the signal that the receiving terminal of up link receives is successively by recovering raw information after TFU-SCMA demodulator, constellation inverse mapping device, deinterleaver, channel decoder and source decoder.
Described TFU-SCMA modulator is modulated signal, and concrete steps are as follows:
(i) generate UW sequence, and with one or more UW form pilot blocks (systematic function requires higher, the UW number in pilot blocks the more, but the number of UW is no more than 4), the length of UW sequence is 2 positive integer time power, and length maximum is no more than 256.When UW is used as protection interval, UW sequence length is not less than the length of channel maximum delay.For example, when system bandwidth is 8MHz, UW length can get 64, comprises 4 UW in pilot blocks.
Length is that homophase (In-phase, hereinafter to be referred as I) road and orthogonal (Quadrature, hereinafter to be referred as Q) road signal of the UW sequence of U (U is positive integer) can be produced by following formula respectively:
Wherein n is the arbitrary integer within the scope of 0 to U-1.
(ii) UW of the insertion of the user profile rear end after constellation mapping does to protect interval group to become fast fourier transform fft block;
(iii) insert above-mentioned pilot blocks at fft block front end, form a TFU-SCMA symbol by pilot blocks and fft block;
Described TFU-SCMA demodulator carries out demodulation to signal, and concrete steps are as follows:
(iv) utilize the pilot tone in TFU-SCMA symbol to carry out sign synchronization and carrier synchronization to the above-mentioned TFU-SCMA symbol receiving, according to the symbol synchronization information obtaining, the pilot blocks in TFU-SCMA symbol is separated with fft block, obtain the fft block separating;
(v) above-mentioned fft block is carried out to Fourier transform, obtain the frequency-region signal that time domain fft block is corresponding;
(vi) the frequency domain gain of the each frequency of channel while utilizing pilot blocks in TFU-SCMA symbol to estimate corresponding TFU-SCMA symbol by channel, utilize this gain to carry out channel equalization to frequency-region signal corresponding in (v), obtain the signal after equilibrium.Wherein, the algorithm of channel estimating and channel equalization can be selected flexibly, for example, channel estimating can adopt based on discrete Fourier transform (DFT) (Discrete Fourier Transform, hereinafter to be referred as DFT) channel estimation method, and channel equalization can adopt ZF (Zero Forcing, hereinafter to be referred as ZF) equalization algorithm;
(vii) frequency-region signal after above-mentioned equilibrium is carried out to IFFT operation, remove the UW of data block rear end, recover user profile.
Described descending sub frame and the concrete structure of sub-frame of uplink are as follows:
Descending sub frame is made up of N TFU-OFDMA symbol; Descending sub frame content comprises: leading, common control information, broadcast data and downlink communication data, as shown in Figure 3; Leading for initial ranging, down channel quality measurement etc., are positioned at descending sub frame foremost, take N
1individual TFU-OFDMA symbol; Common control information is for transmitting the system control message such as map information, the map information of uplink communication data of downlink communication data, be positioned at leading after, take N
2individual TFU-OFDMA symbol; In descending sub frame, remove the leading and shared TFU-OFDMA outer symbol of common control information, remaining N
3individual symbol transmits broadcast data and downlink communication data simultaneously, and broadcast data and downlink communication data take respectively different subchannels, broadcast data part is for transmission of one line or the shared user profile of multichannel, and downlink communication data division is for transmitting the proprietary user profile of multichannel; In downlink communication data division, continuous S TFU-OFDMA symbol is divided into a symbols; Resource distributes elementary cell (Resource Allocation Element, hereinafter to be referred as RAE) to take in time a symbols, on frequency domain, take a sub-channels; Each road user profile all takies an integer RAE; Above-mentioned N, N
1, N
2, N
3, S is positive integer, and N>=20,1≤N
1≤ 3,1≤N
2≤ 10, N
3=N-N
1-N
2, S≤N-N
1-N
2, (N-N
1-N
2) mod S=0;
In the present embodiment, above-mentioned each parameter arranges as follows:
N＝48，N
1＝1，N
2＝7，S＝10。
Sub-frame of uplink is made up of K time slot, and each time slot duration is 360us, and sub-frame of uplink content comprises random access and bandwidth request part on opportunity and uplink burst data part, as shown in Figure 4; Front K
1each time slot in individual time slot is divided into 4 mini-slot, each mini-slot is a transmission opportunity for random access or bandwidth request, need to access at random or the UE of bandwidth request sends the short TFU-SCMA symbol (symbol duration equals 90us) of a random access of carrying or bandwidth request information within certain transmission opportunity; Remaining K
2individual time slot is used for transmitting uplink burst data, and m uplink burst piece takies front m time slot of uplink burst data part, and each uplink burst piece is made up of a long TFU-SCMA symbol (symbol duration equals 360us); M value is relevant with the uplink transmission block sum that all users of current time need to be transmitted; Above-mentioned K, K
1, K
2, m is positive integer, and K>10,0<K
1<K, K
2=K-K
1, 0≤m≤K
2; In the present embodiment, above-mentioned each parameter arranges as follows: K=12, K
1=2, K
2=10.
The personal media services operational approach embodiment of the BRadio BWA that the present invention proposes, adopts personal media services utilization family content-based and that channel strip is shared to obtain the data that oneself need.
In BRadio BWA, the personal media services PMS technology that personal media services business employing content and channel strip are shared.PMS adopts the mode of broadcast base station (large base station)+communication base station (little base station) to merge radio network and communication network.Large base station is broadcast base station, and transmitting power is larger, and covering radius is larger, more than being generally several kms, can provide multiple channels simultaneously, transmits multinomial content simultaneously.Little base station is cellular basestation, and covering radius is less, provides up channel to send request for user, and down channel can send data to user.In this system, work in coordination in He little base station, large base station, medium access control (Media Access Control, hereinafter to be referred as MAC) layer scheduling algorithm by according to Different Strategies to the Radio Resource of large and small base station unify, reasonable distribution, guarantee that the utilance of wireless frequency spectrum is optimum or approach optimum.
The step that user obtains the data that oneself need is as follows:
1) server can be processed the normal request sending of user, analyzes this user's interest place, and these data are stored in database, uses in order to this user;
2), when user sends request to server by communication channel, when obtaining the data that oneself need, if there have been the data of user request in server, directly by communication channel or broadcast channel, the data of client requests are sent to user; Specifically comprise:
2-1), if server is replied by communication channel, client just can directly obtain from communication channel the data that need;
2-2) if server reply by broadcast channel, the response message that user obtains from communication channel is to comprise from broadcast channel to receive the metadata of requested date and unsolicited data itself (meta-data pack contains broadcast channel frequencies, data item identifier, data item index information and other supplementarys etc. conventionally), user obtains broadcast channel access information according to the metadata of receiving, then monitor at the broadcast channel of specifying, wait for that the data item oneself needing arrives;
3) user receives after metadata, has just obtained broadcast channel access information, then monitors at the broadcast channel of specifying, and waits for that the data item oneself needing arrives.If the data of user's request do not have in server, server will be searched on the internet, obtain the data that user needs, and then send to user.
Although with reference to accompanying drawing, invention has been described, it should be appreciated by those skilled in the art, can, in the case of not deviating from the aim of the present invention and scope being defined by the following claims, carry out the change in various forms and details to the present invention.
Claims (6)
1. a BWA, is characterized in that, this system is made up of down link and up link, wherein, signal by base-station transmission to terminal be down link, signal is up link by terminal transmission to base station; Described down link comprise be arranged on base station end by side signal transmission to connected successively source encoder, channel encoder, constellation mapper and TFU-OFDMA modulator, be arranged on terminal by side signal transmission to connected successively TFU-OFDMA demodulator, constellation inverse mapping device, channel decoder and source decoder; The signal output part of the TFU-OFDMA modulator of described base station end is connected with the signal input part of the TFU-OFDMA demodulator of terminal by channel; Described up link comprises connected source encoder, channel encoder, interleaver, constellation mapper and the TFU-SCMA modulator successively that is arranged on terminal, connected TFU-SCMA demodulator, constellation inverse mapping device, deinterleaver, channel decoder and the source decoder successively that is arranged on base station end, the signal output part of the TFU-SCMA modulator of described terminal is connected with the signal input part of the TFU-SCMA demodulator of base station by channel.
2. one kind based on the method for transmitting signals of BWA as claimed in claim 1, it is characterized in that, the method is included in signal transmission and the transmission of the signal in the up link two parts in down link, and down link, up link adopt tdd frame structure to realize time division duplex: the duration of this tdd frame is 10ms, and this tdd frame structure is made up of descending sub frame, guard time and sub-frame of uplink three parts; Descending sub frame is for transmission of downlink signal, and sub-frame of uplink is used for transmitting upward signal, and guard time is the protection interval that descending sub frame is transformed into sub-frame of uplink; Each several part duration arranges any that adopts following 4 kinds of schemes: (1) descending sub frame is 5400us, and sub-frame of uplink is 4320us, and guard time is 280us; (2) descending sub frame is 4320us, and sub-frame of uplink is 5400us, and guard time is 280us; (3) descending sub frame is 3960us, and sub-frame of uplink is 5760us, and guard time is 280us; (4) descending sub frame is 3600us, and sub-frame of uplink is 6120us, and guard time is 280us.
3. method as claimed in claim 2, is characterized in that, described descending sub frame is made up of N TFU-OFDMA symbol; These TFU-OFDMA symbols are divided into common control information, downlink communication data and broadcast data three parts according to the information of its carrying; Common control information, for transmitting the system control message being made up of the map information of the map information of downlink communication data, uplink communication data, is positioned at descending sub frame foremost, takies N
1individual TFU-OFDMA symbol; Downlink communication data, after common control information, take N
2individual TFU-OFDMA symbol; Broadcast data is positioned at after downlink communication data, takies N
3individual TFU-OFDMA symbol; Above-mentioned N, N
1, N
2, N
3be positive integer, and N>=20,1≤N
1≤ 3,1≤N
2≤ N-N
1, N
3=N-N
1-N
2.
4. method as claimed in claim 2, is characterized in that, described sub-frame of uplink is made up of K time slot, and each time slot duration is 360us, and sub-frame of uplink comprises random access and bandwidth request part on opportunity and uplink burst data part; Front K
1each time slot in individual time slot is divided into 4 mini-slot, each mini-slot is a transmission opportunity for random access or bandwidth request, need to access at random or the user (UE) of bandwidth request sends the short TFU-SCMA symbol of a random access of carrying or bandwidth request information within certain transmission opportunity, this TFU-SCMA symbol duration equals 90us; Remaining K
2individual time slot is used for transmitting uplink burst data piece; A uplink burst data piece is made up of a long TFU-SCMA symbol (symbol duration equals 360us); M uplink burst data piece takies front m time slot of uplink burst data part, the uplink burst data piece sum that m value need to be transmitted for all users of current time; K, K
1, K
2, m is positive integer, and K>10,0<K
1<K, K
2=K-K
1, 0≤m≤K
2.
5. one kind based on the personal media services operational approach of BWA as claimed in claim 1, it is characterized in that, the personal media services technology that the method is content-based and channel strip is shared, user is sent request and obtains the data that oneself need to server by communication channel; Concrete steps are as follows:
1) request that server often sends user is processed, and analyzes this user's interest place, and the data that this user may be needed are stored in the database of server, uses in order to this user;
2), when user sends request to server by communication channel, when obtaining the data that oneself need, if there have been the data of user request in server, directly by communication channel or broadcast channel, the data of client requests are sent to user;
3) if the data of user's request do not have in server, server will be searched on the internet, obtain the data that user needs, and then send to user.
6. method as claimed in claim 5, is characterized in that described step 2) if in had the data of user's request in server, directly by communication channel or broadcast channel, the data of client requests are sent to user; Concrete mode comprises following several;
If 2-1) server is replied by communication channel, client directly obtains from communication channel the data that need;
2-2) if server reply by broadcast channel, user obtains response message from communication channel, response message comprises the metadata that receives requested date from broadcast channel, user obtains broadcast channel access information according to the metadata of receiving (comprising broadcast channel frequencies, data item identifier, data item index information and other supplementarys), then monitor at the broadcast channel of specifying, wait for that the data item oneself needing arrives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410190668.7A CN104168097A (en) | 2014-05-07 | 2014-05-07 | Broadband wireless access system and signal transmission thereof and individual media service business method |
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