CN101123805A - Orthogonal frequency division multiplexing access system and its device, transmission method and terminal - Google Patents
Orthogonal frequency division multiplexing access system and its device, transmission method and terminal Download PDFInfo
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Abstract
The invention relates to the field of wireless communication and discloses an orthogonal frequency division multiplexing access system and a device, a transmission mode and a terminal of the system which can make the terminal based on OFDM carry through right receiving of the data from the network side. In the invention, the network side transmits first information that indicates the mapping relationship between the current logical resources and physical resources to the terminal to lead the terminal to ensure the physical resources belonging to the terminal according to the mapping relationship and then rightly receives the data from the network side from the physical resources. Under mode 2, a sub band is divided into much smaller micro-sub bands beforehand. Each micro-sub band is corresponding to be a DRCH micro-sub band or a BRCH micro-sub band. When BRCH channels are fewer, the division can lead the DRCH channels to disperse into much bigger time-frequency resources to acquire bigger diversity gain. The first information can be the number of DRCH under mode 1 or the number of the sub bands under mode 2. The first information can also be the distribution situation of DRCH under mode 1 or the division situation of DRCH sub bands or micro-sub bands under mode 2.
Description
Technical field
The present invention relates to wireless communication field, particularly OFDM inserts (OrthogonalFrequency Multiple Access is called for short " OFDMA ") technology.
Background technology
In the last few years, be subjected to people's extensive concern for the multi-carrier transmission technology of representative with OFDM (Orthogonal Frequency Division Multiplexing is called for short " OFDM ").Multi-carrier transmission is decomposed into several independently sub data flows to data flow, and each sub data flow will have much lower bit rate.The low rate multimode symbol that forms with such low bit rate removes to modulate corresponding subcarrier, has just constituted the transmission system that a plurality of low rate symbol parallels send.
OFDM transmits the encoded back of data as a kind of multi-carrier digital modulation technique at frequency domain.Single-carrier technology unlike routine, as amplitude modulation/frequency modulation (Amplitude Modulation/FrequencyModulation, be called for short " AM/FM "), at a time only send single signal with single-frequency, OFDM sends the multipath high-speed signal simultaneously on through the special orthogonal frequency that calculates.
OFDM is again as a kind of multiplex technique, with multi-way signal multiplexing on the different orthogonal subcarrier.Traditional frequency division multiplexing (Frequency Division Multiplexing is called for short " FDM ") technology is divided into several subchannels with bandwidth, and the centre reduces interference with the protection frequency band, and they send data simultaneously.Ofdm system is wanted much less than the bandwidth of traditional FDM system requirements.Because use noiseless quadrature carrier technology, single intercarrier need not to protect frequency band.Make that like this service efficiency of usable spectrum is higher.In addition, the OFDM technology can dynamically be distributed in the data on the subchannel.For obtaining maximum data throughout, multi-carrier modulator can distribute more data intelligently to the little subchannel of noise.
OFDM will through the coding data to be transmitted as frequency domain information, it is modulated to time-domain signal, and, then carries out the inverse process demodulation at receiving terminal in channel.The modulation and demodulation of ofdm system can be respectively by contrary discrete Fourier transform (DFT) (Inverse Discrete Fourier Transform, be called for short " IDFT ") and discrete Fourier transform (DFT) (Discrete Fourier Transform, abbreviation " DFT ") replace.By N point IDFT computing, be the frequency domain data sign reversing time domain data symbol, through after the carrier modulation, send in the channel.At receiving terminal, received signal is carried out coherent demodulation, then baseband signal is carried out N point DFT computing, the data symbol that can obtain to send.In actual applications, IDFT/DFT adopts contrary fast fourier transform (Inverse Fast Fourier Transform is called for short " IFFT ") and fast fourier transform (Fast Fourier Transform is called for short " FFT ") to realize.The employing of FFT technology makes the complexity of ofdm system reduce greatly, add the high-performance information processing device such as programmable logic device (Programmable Logic Device, abbreviation " PLD "), digital signal processor (Digital Signal Processor, abbreviation " DSP "), microprocessor (MicroProcessor, abbreviation " μ P ") etc. development and application, make the realization of ofdm system be more prone to, become most widely used a kind of multi-carrier transmission scheme.
OFDM inserts (Orthogonal Frequency Multiple Access, be called for short " OFDMA ") be one of 3 kinds of main physical layers that in 802.16a, propose, it still belongs to ofdm system in essence, just its multi-access mode is that different user distributes different subcarrier implications, so be called as OFDMA.
In the OFDMA system, the type of physical channel can be divided into two kinds: discrete channel resource (Distributed Resource Channel is called for short " DRCH ") and piece channel resource (Block ResourceChannel is called for short " BRCH ").BRCH is made up of the subcarrier of plurality of continuous and continuous OFDM symbol, becomes block on the temporal frequency domain of physical channel, therefore is called piece channel resource (BRCH), as shown in Figure 1.DRCH is made up of discontinuous plurality of sub carrier wave and OFDM symbol, becomes discrete shape on the temporal frequency domain of physical channel.Therefore be called discrete channel resource (DRCH).As shown in Figure 2.
Generally speaking, no matter be DRCH or BRCH, the shared running time-frequency resource number of each channel is identical.When two kinds of channel multiplexings during, can be divided into two kinds of multiplexer modes at a frame.As shown in Figure 3, first kind of pattern, promptly in the pattern 1, each DRCH discrete distribution is on the whole frequency band of each frame, and BRCH is removing Resources allocation on the Resource Block of DRCH; Second kind of pattern, promptly in the pattern 2, DRCH takies different frequency band (subband) with BRCH.The control channel of terminal and base station all needs to support this two kinds of patterns, and, be embodied as the terminal assignments physical resource by the assignment logic resource.That is to say that system gives the different logical resource of terminal distribution, terminal determines that according to the mapping relations of logical resource and physical resource one's own data allocations is on those physical resources.At present 3G (Third Generation) Moblie partner program second edition (3rd Generation Partnership Project 2, be called for short " 3GPP2 ") in, this mapping relations realize by Channel Tree (channel trees), the corresponding ChannelID (channel identification number) of each node on each Channel Tree, each ChannelID is with corresponding one group of logical sub carrier wave.
The OFDMA system is the same with radio honeycomb communication system, and channel resource can be divided into Traffic Channel and control channel usually.Traffic Channel is responsible for the relevant data of transport service.Control channel is responsible for transmitting the signaling that base station and terminal room exchange mutually.In order to support multi-user's environment, down control channel can be divided into broadcast channel (Broadcast Channel usually again, be called for short " BCH "), shared control channel (SharedControl Channel, be called for short " SCCH "), Dedicated Control Channel (Dedicated Control Channel is called for short " DCCH ") or the like.BCH broadcasts some system informations.SCCH transmits at a channel a plurality of users' control information is multiplexing, and a plurality of users can obtain control information separately by this channel, and this channel is called shared signaling channel (Shared Signaling Channel is called for short " SSCH ") again.DCCH is the control channel resource to certain terminal-specific.
At present, the physical channel that defines in the 3GPP2 standard comprises: the basic broadcast channel of forward direction (ForwardPrimary Broadcast Channel, be called for short " F-PBCCH "), forward direction second broadcast channel (ForwardSecondary Broadcast Channel, be called for short " F-SBCCH "), other sector interference indications channel of forward direction (Forward Other Sectors Interference Channel, be called for short " F-OSICH "), forward direction bid (Forward Acquisition Channel, be called for short " F-ACQCH "), forward direction Common Pilot Channel (Forward Common Pilot Channel, be called for short " F-CPICH "), forward dedicated pilot channel (Forward Dedicated Pilot Channel, be called for short " F-DPICH "), forward direction is assisted Common Pilot Channel (Forward Auxiliary Common Pilot Channel, be called for short " F-AUXPICH "), forward shared control channel (Forward shared control channel, be called for short " F-SCCH "), forward power control channel (Forward Power Control Channel, be called for short " F-PCCH "), forward direction acknowledgement channel (Forward Acknowledgement Channel, be called for short " F-ACKCH "), forward pilot quality indicator channel (Forward Pilot Quality IndicatorChannel, be called for short " F-PQICH "), and F-DCH (Forward Dedicated Channel is called for short " F-DCH ").Wherein, F-PBCCH has carried the detail parameters of system deployment, and F-SBCCH is used to transmit the sector details.F-SCCH, F-PCCH, F-ACKCH, F-PQICH and F-FOSICH belong to forward control channel.F-SCCH, F-PBCCH, F-SBCCH can be used for communicating control information and system parameters, and forward channel structure as shown in Figure 4.
Forward control channel transmits by the FDM section in each physical frame, and each forward control channel is respectively applied for control information transmission, is used for assignment and the access permission of managing preceding oppositely resource, designated packet form and being in the idle condition terminal as F-SCCH.F-ACKCH confirms that to reverse transfer F-PCCH is used to transmit the reverse power control order, and F-PQICH is used to indicate reverse pilot quality etc.
Wherein, F-SCCH has carried the designated terminal distribution and has discharged the preceding oppositely information of resource, and 6 kinds of information as shown in table 1 are arranged usually.
| Field | Block type block type | MACID | Persis- tent | Channel ID channel logo | PF | Durati on | Ext. TX | Timing regularly | Suppl. | Rank |
| Number of bits | 3 | 9-11 | 1 | 6-8 | 4-6 | 2 | 1 | 6 | 1 | 2 |
| Access Grant | 000 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| FLAM | 010 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 |
| RLAM | 011 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 |
| MCW FLAM1 | 100 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 |
| MCW FLAM2 | 101 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 |
| SCW FLAB | 110 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 |
Table 1
In table 1, different fields, the control channel message that line display is different are shown in tabulation.A common control channel message will comprise a plurality of fields, comprise as " Access Grant " message and be used to represent that this information belongs to the block type field of " Access Grant ", the MACID of designated terminal (medium Access Layer sign) and is used for 6 bit information fields regularly; Such as " FLAM " message of the terminal assignments forward channel resource that is used to appointment, wherein comprised block type again, PF, Ext.TX and the Suppl. field of Persistent, channelID, transmission grouping.Each message with the cyclic redundancy check (CRC) of 16 bits (Cyclic Redundancy Check is called for short " CRC ") to increase the reliability that detects.When sending " FLAM " message, which terminal is this " FLAM " message belong to is carried out scrambling with regard to the MACID with which terminal to this message, the terminal that does not belong to this message like this can't correctly receive this message blocks, has guaranteed that message correctly is sent to the terminal of appointment.
In actual applications, have following problem: terminal possibly can't correctly receive data.
Cause the main cause of this situation to be, in present prior art, forward control channel has only comprised F-SCCH, F-ACKCH, and F-PCCH, F-PQICH, five kinds of channels of F-FOSICH have also only defined 6 kinds of type of messages among the F_SCCH.Though can will comprise that the information of resource allocation mode is notified to terminal by SBCCH, inform that its resource allocation mode of this terminal is to belong to first kind of pattern, still belong to second kind of pattern, but in each physical frame, this terminal is only known the ChannelID of oneself, and does not know the mapping mode of ChannelID and concrete physical resource.Therefore, this terminal can't be carried out correct reception to data in this case.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of OFDM access system and equipment, transmission method and terminal, and feasible terminal based on OFDM can correctly receive the data from network side.
For achieving the above object, the invention provides data receive method in a kind of OFDM access system, comprise following steps:
Network side is to the terminal transmission first information, and terminal obtains the mapping relations of current logical resource and physical resource according to the first information, and receives data from described network side according to these mapping relations.
Wherein, pattern 2 times, be littler little subband in advance with sub-band division.
In this external described method, the described first information is one of following:
1 time discrete channel resource DRCH number of pattern;
1 time DRCH distribution condition of pattern;
2 times DRCH subbands of pattern number; Or,
The dividing condition of 2 times DRCH subbands of pattern, little subband.
In this external described method, when the described first information was 1 time DRCH number of pattern or 2 times DRCH subbands of pattern number, first information length was according to the maximum decision of maximum DRCH number of current system and maximum DRCH subband number.
In this external described method, when the described first information was the dividing condition of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband, the length of the first information was the maximum of 1 time maximum DRCH number of pattern and 2 times maximum DRCH subbands of pattern or little subband number;
Pattern 1 time, whether each bit of the described first information represents the DRCH of a correspondence occupied;
Pattern 2 times, on behalf of the subband of a correspondence or little subband, each bit of the described first information belong to DRCH or BRCH.
In this external described method,, the length of the described first information also comprises the bit that is used to indicate current resource allocation mode if less than 18 bits, then transmitting in the message blocks of this first information.
In this external described method, if the described first information is the dividing condition of 2 times DRCH subbands of pattern, little subband, and the length of this first information is less than 18 bits, then transmits to comprise also in the message blocks of this first information that to be used to indicate DRCH be bit according to subband or little sub-band division.
In this external described method, the described first information uses a message blocks separately, or share a message blocks with out of Memory.
In this external described method, described terminal comprises following steps according to the step that described mapping relations receive data:
Described terminal is inquired about described mapping relations according to current shared logical resource, finds the corresponding physical resource, receives the data that belong to this terminal from these physical resources.
In this external described method, described network side by with one of lower channel or its combination in any to the described first information of described terminal transmission;
Forward shared control channel F-SCCH, the forward direction second broadcast channel F-SBCCH or be exclusively used in the resource allocation message channel transmitted.
In this external described method, by the F-SBCCH transmission, when the first information changed, the first information after will changing by F-SCCH was again notified described terminal to the described first information earlier.
In this external described method, the described first information transmits by forward traffic channel as the message or the signaling of media interviews control MAC layer.
In this external described method, field or an independent MAC layer message in the message that the described first information is configured physical layer parameter as the MAC layer are transmitted by forward traffic channel.
The present invention also provides a kind of OFDM access system, comprises network side and terminal, and network side also comprises to the unit of the terminal transmission first information and sends the unit of data to terminal;
Terminal also comprises:
Receive the described first information and obtain according to the first information current logical resource and physical resource mapping relations the unit and
According to the unit of this mapping relations reception from the data of described network side.
Wherein, pattern 2 times, the described first information is the dividing condition of little subband, and wherein little subband is formed by sub-band division;
Send data by little subband to terminal to the unit of terminal transmission data in the described network side;
The unit that receives data in the described terminal receives from described network data from little subband.
The present invention also provides a kind of OFDM access system network equipment, comprises:
Can therefrom obtain to terminal transmission current logical resource and physical resource mapping relations the first information the unit and
Send the unit of data to terminal.
The present invention also provides a kind of terminal based on OFDM, comprises:
Receive the first information and obtain according to the first information current logical resource and physical resource mapping relations the unit and
According to the unit of this mapping relations reception from the data of described network side.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, network side will indicate the information (the present invention is called the first information) of the mapping relations of current logical resource and physical resource to be transferred to terminal, make terminal can determine to belong to the physical resource of this terminal according to these mapping relations, and then from the correct data that receive from network side of these physical resources.
Pattern 2 times, in advance subband (Subband) is divided into littler little subband (Micro-Subband), each little subband belongs to little subband of DRCH or the little subband of BRCH.When the BRCH channel after a little while, this division can allow the DRCH channel dispersion in bigger running time-frequency resource, obtain big diversity gain, simultaneously, the little subband of BRCH is little than subband, also can disperse more, system can be the channel resource of BRCH user's assignment the best according to channel condition more neatly like this.
The first information can be number or 2 times DRCH subbands of the pattern number of 1 time current use DRCH of pattern.The number of 1 time DRCH of pattern only needs 6 bits, and 2 times DRCH subbands of pattern number only needs 2 bits, so this scheme makes the length of the first information less, the first information can share a message blocks to reduce taking of interface-free resources with other broadcast message.
The first information can also be the dividing condition of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband.The length of the first information is longer under this scheme, but can clearly represent the occupied situation of each DRCH for 1 time in pattern; Clearly represent that in pattern each subband or little subband belong to DRCH or belong to BRCH, are applicable to the situation that DRCH changes for 2 times.
The first information can be by increase the message blocks transmission in existing physical layer control channel, as F-SCCH, F-SBCCH etc.Compare increasing message blocks under with the F-SCCH channel under the F-SBCCH channel, F-SBCCH transmits once in the preamble of a superframe, and resource distribution mode does not change in a superframe, and expense is less.F-SCCH is broadcasting after the changing of resource allocation map crime under two kinds of patterns, the real-time height, and resource distribution mode can be according to the user situation real-time change.
The first information also can also comprise Mode (pattern) field by newly-increased physical layer control channel transmission in this channel, make the resource distribution mode can be more flexible.
Description of drawings
Fig. 1 is according to BRCH schematic diagram in the prior art;
Fig. 2 is according to DRCH schematic diagram in the prior art;
Fig. 3 is according to two kinds of resource distribution mode schematic diagrames in the prior art;
Fig. 4 is according to forward channel structure schematic diagram in the prior art;
Fig. 5 is according to data receive method flow chart in the OFDMA system of first embodiment of the invention;
Fig. 6 is according to forward channel structure schematic diagram in the data receive method in the OFDMA system of first embodiment of the invention;
Fig. 7 is according to forward channel structure schematic diagram in the data receive method in the OFDMA system of second embodiment of the invention;
Fig. 8 is according to 2 times subbands of pattern, little sub-band division resource allocation schematic diagram in the data receive method in the OFDMA system of third embodiment of the invention;
Fig. 9 is according to forward channel structure schematic diagram in the data receive method in the OFDMA system of third embodiment of the invention;
Figure 10 is according to data receive method flow chart in the OFDMA system of fifth embodiment of the invention.
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.
Core of the present invention is, network side is represented the first information of the mapping relations of current logical resource and physical resource to terminal transmission, and the dividing condition of the subband number of the number that this information can be by comprising 1 time DRCH of pattern, the distribution condition of 1 time DRCH of pattern, 2 times DRCH of pattern or 2 times DRCH subbands of pattern, little subband is represented the mapping relations of current logical resource and physical resource.Terminal finds the corresponding physical resource according to this first information, and receives the data that belong to this terminal from these corresponding physical resources.
More than core of the present invention has been done simple declaration, below according to this principle, data receive method in the first execution mode OFDMA system of the present invention is described in detail.
As shown in Figure 5, in step 510, network side is represented the first information of the mapping relations of current logical resource and physical resource to terminal transmission.
Specifically, network side increases by one and is used to transmit this first information broadcast piece in the F-SCCH channel, and the first information length in this message blocks can be according to the decision of system resource size.Because in present 3GPP2 standard, usually shine upon with in logic Base node (fundamental node) and resource physically, generally speaking, it is 512 points that FFT counts, bandwidth is that the OFDMA system (the OFDMA system among the present invention is not limited thereto type systematic) of 5M comprises 32*Q Base node, Q is that space division multiplexing inserts the dimension of (Space Division Multiple Access is called for short " SDMA ").Each Base node can be mapped as BRCH or DRCH Resource Block, but owing to do not influence the number of DRCH channel under the SDMA pattern, therefore, under the situation of pattern 1, the DRCH number is 32 to the maximum, to take 6 bits, under the situation of pattern 2, each subband is the Resource Block of 128*8, and maximum sub band number is 4, therefore maximum DRCH sub band number is 4, only needs 2 bits to get final product.So in the present embodiment, the length of the first information is 6 bits, be used in Mode 1 time broadcasting DRCH channel number with in 2 times broadcasting of pattern DRCH subband number.The first information because maximum DRCH sub band number is 4, only need be used 2 bits in the first information when 2 times broadcasting of pattern DRCH subband number, therefore, can be used to represent the subband number of DRCH 2 at the end in the first information, mends 0 for high 4.Certainly, concrete message represents that mode is not unique, and also available other mode is represented the first information.
Because the message blocks in the F-SCCH channel comprises 18 information bits of 16CRC check bit sum, and the DRCH field of the expression DRCH number of channel or DRCH sub band number at most only needs 6 bits, therefore, the first information that is transmitted in the present embodiment can use a message blocks separately, also can share a message blocks, to reduce taking of interface-free resources with out of Memory.Increase by one be used to transmit the broadcast piece of this first information after, the forward channel structure in the OFDMA system is as shown in Figure 6.
Need to prove, owing to no matter be in pattern 1 or under pattern 2 patterns, the DRCH number of channel that need broadcast or DRCH sub band number not necessarily each OFDM frame all change, and the message blocks of therefore transmitting the first information is just broadcasted the user in the sector when only two parameters change in the above.Because F-SCCH can broadcast the DRCH number of channel or DRCH sub band number in each physical frame, therefore, after the resource allocation map crime changes under two kinds of patterns, broadcast by F-SCCH, the real-time height, resource distribution mode can be according to the user situation real-time change.
Then, enter step 520, terminal finds the corresponding physical resource according to this first information.Specifically, because in step 510, network side has sent the first information of the mapping relations of representing current logical resource and physical resource to terminal, therefore, in this step, this terminal can find the corresponding physical resource according to this first information.Such as the resource allocation mode of this terminal is a pattern 1, and network side DRCH channel number in the first information that terminal sends is 5, and then this terminal is the corresponding physical resource that 5 o'clock resource mapping relationship searching arrives according to the DRCH number.
Then, enter step 530, this terminal receives data in the corresponding physical resource that finds.At above-mentioned case, this terminal receives the data that belong to this terminal among 5 DRCH in the past.
Be not difficult to find, in the present embodiment, because network side will indicate the first information of the mapping relations of current logical resource and physical resource to be transferred to terminal, thereby make terminal can determine to belong to the physical resource of this terminal, and then come automatic network data then from the correct reception of these physical resources according to these mapping relations.This first information is DRCH number or DRCH subband number, makes that the expense of this first information of transmission is little, and makes resource distribution mode more fixing.
The data receive method and first execution mode are roughly the same in the second execution mode OFDMA system of the present invention, its difference only is, in the first embodiment, network side will represent that the first information of the mapping relations of current logical resource and physical resource is transferred to terminal by F-SCCH, and in the present embodiment, network side will represent that the first information of the mapping relations of current logical resource and physical resource is transferred to terminal by F-SBCCH, in the present embodiment, the forward channel structure in the OFDMA system as shown in Figure 7.This first information of transmission is compared with this first information of transmission in F-SCCH in F-SBCCH, and F-SBCCH transmits once in the preamble of a superframe, and resource distribution mode does not change in a superframe, and expense is less.If in a superframe, the DRCH number of channel or DRCH sub band number change, and the resource allocation pattern after then will becoming by F-SCCH is transferred to terminal, make resource distribution mode to have higher real-time according to the user situation real-time change.
The data receive method and first execution mode are roughly the same in the 3rd execution mode OFDMA system of the present invention, its difference only is, in the first embodiment, the first information of representing the mapping relations of current logical resource and physical resource is DRCH number under the pattern 1 or the DRCH subband number under the pattern 2, and in the present embodiment, the first information of representing the mapping relations of current logical resource and physical resource is the DRCH distribution condition under the pattern 1, perhaps, be the dividing condition of 2 times DRCH subbands of pattern, little subband.
Specifically, pattern 1 time, represent the distribution condition of DRCH by the first information, such as, the respectively corresponding DRCH of each bit in this first information, this bit value represents whether pairing DRCH is occupied, therefore, the length of this first information is maximum numbers of DRCH.Because under the situation of pattern 1, the DRCH number of channel will make BRCH channel resource block size that bigger variation takes place too much, be unfavorable for scheduling, therefore the DRCH channel should switch to pattern 2 times more for a long time, so 1 time DRCH number of pattern can be a numerical value less than Base node number, promptly less than 32 a numerical value, and, message blocks in the F-SCCH channel comprises 18 information bits, therefore, whether the length of this first information can be 18 bits, utilize these 18 bits to indicate DRCH0～DRCH17 channel occupied.As 18 information 001000100010001000 expression DRCH15, DRCH11, DRCH7, DRCH3 is occupied, the terminal occupied situation of each DRCH that can know for sure like this, so can know the method for salary distribution of resource by these 18 bits.In addition, the DRCH number of channel generally is no more than 1/2 of Base node number, and therefore, the length of this first information can be 16 bits, similarly, the respectively corresponding DRCH of each bit, this bit value represents whether pairing DRCH is occupied.
Pattern 2 times, because maximum sub band number is 4, even therefore with each subband corresponding to a bit, also only need 4 bits, in order to allow the DRCH channel dispersion in bigger running time-frequency resource, to obtain big diversity gain, simultaneously also in order to allow BRCH disperse more, the system that makes can be according to channel condition more neatly for the channel resource of BRCH user's assignment the best, network side can be littler little subband with sub-band division in advance, each little subband belongs to little subband of DRCH or the little subband of BRCH, as shown in Figure 8.Though after changing the subband size, can obtain the frequency diversity gain identical equally with little subband, but, channel quality indication (Channel Quality Indicator is called for short " CQI ") is according to the subband feedback, so the CQI feedback quantity will increase to some extent, and in the present embodiment, owing to do not need to change the size of subband, therefore when obtaining the frequency diversity effect, can not increase the CQI feedback quantity yet, certainly, also need not to increase overhead channel notice terminal subband size.
With sub-band division is that the method for little subband has greatly changed the resource distribution mode under the existing pattern 2, make under the pattern 2 resource distribution mode more flexibly and effectively.Little sub band number after the division can be 4-16, the dividing condition of representing the subband of DRCH, little subband pattern 2 times by the first information with represent that by the first information distribution condition of DRCH is similar pattern 1 time, with the dividing condition of representing little subband is example, resource distribution mode with N little subband of N bit indication, mostly be most 16 bits, the pairing little subband of the value representation of each bit belongs to the little subband of DRCH or belongs to the little subband of BRCH, and the expression mode of N bit is not unique.Certainly N bit also can be represented with 16 bits, as representing that by the mode of filling invalid value method for expressing is not unique.In the present embodiment, the forward channel structure in the OFDMA system as shown in Figure 9.
What deserves to be mentioned is,,, therefore can in the message blocks of this first information of transmission, comprise the bit that is used to indicate current resource allocation mode because the message blocks maximum of F-SCCH can transmit 18 bits when the length of the first information during less than 18 bits.Such as the length of the first information is 16 bits, and so, 2 remaining bits can be used to indicate resource allocation mode, and being pattern 1 still is pattern 2, therefore, also just need not to indicate the present located pattern by other channels.If this first information is the dividing condition of 2 times DRCH subbands of pattern, little subband, then when the length of this first information is 16 bits, can in 2 remaining bits, select a bit to be used to indicate resource allocation mode, be used to indicate DRCH to divide another bit, still divide according to little subband according to subband.
Be not difficult to find that because in the present embodiment, the first information is the dividing condition of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband.Though the length of the first information is longer under this scheme, can clearly represent the occupied situation of each DRCH for 1 time in pattern; Clearly represent that in pattern each subband or little subband belong to DRCH or belong to BRCH, are applicable to the situation that DRCH changes for 2 times.
Data receive method and the 3rd execution mode are roughly the same in the 4th execution mode OFDMA system of the present invention, its difference only is, in the 3rd execution mode, network side will represent that the first information of the mapping relations of current logical resource and physical resource is transferred to terminal by F-SCCH, and in the present embodiment, network side will represent that the first information of the mapping relations of current logical resource and physical resource is transferred to terminal by F-SBCCH, this first information of transmission is compared with this first information of transmission in F-SCCH in F-SBCCH, F-SBCCH transmits once in the preamble of a superframe, resource distribution mode does not change in a superframe, and expense is less.If in a superframe, the dividing condition of DRCH distribution condition or DRCH subband, little subband changes, resource allocation pattern after then will becoming by F-SCCH is transferred to terminal, makes resource distribution mode to have higher real-time according to the user situation real-time change.
Data receive method as shown in figure 10 in the 5th execution mode OFDMA system of the present invention, in step 1001, network side is represented the first information of the mapping relations of current logical resource and physical resource by being exclusively used in the resource allocation message channel transmitted to terminal transmission.Specifically, it can be number or 2 times DRCH subbands of the pattern number (with the first information in the execution mode one) of 1 time DRCH of pattern that this first information can be, make that the length of the first information is less,, and then reduce taking of interface-free resources so that share a message blocks with other broadcast message; Also can be the dividing condition (with the first information in the execution mode three) of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband, so that clearly represent the occupied situation of each DRCH for 1 time in pattern; Clearly represent that in pattern each subband or little subband belong to DRCH or belong to BRCH, are applicable to the situation that DRCH changes for 2 times.Pattern under this is exclusively used in the resource allocation that can also transmit this terminal in the resource allocation message channel transmitted, change or when this first information changes in resource allocation mode, pattern or represent the first information of the mapping relations of current logical resource and physical resource under this is exclusively used in the resource allocation message channel transmitted resource allocation that sends this terminal makes that resource distribution mode can be more flexible.
Data receive method and the 5th execution mode are roughly the same in the 6th execution mode OFDMA system of the present invention, its difference only is, in the 5th execution mode, network side is represented the first information of the mapping relations of current logical resource and physical resource by being exclusively used in the resource allocation message channel transmitted to terminal transmission, and in the present embodiment, this first information is transferred to terminal as the message or the signaling of MAC layer by forward traffic channel.
Specifically, in the message of MAC layer, be useful on the message that physical layer parameter is configured, usually as " ExtendedChannelInfo " message among the communication protocol C802.20.Therefore, both can in this message, increase newer field and transmit this first information, also can be transferred to terminal by forward traffic channel with this first information as an independent MAC layer message.Identical with the 5th execution mode, it can be number or 2 times DRCH subbands of the pattern number (with the first information in the execution mode one) of 1 time DRCH of pattern that this first information can be, make that the length of the first information is less, so that share a message blocks, and then reduce taking of interface-free resources with other broadcast message; Also can be the dividing condition (with the first information in the execution mode three) of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband, so that clearly represent the occupied situation of each DRCH for 1 time in pattern; Clearly represent that in pattern each subband or little subband belong to DRCH or belong to BRCH, are applicable to the situation that DRCH changes for 2 times.
Comprise network side and terminal in the 7th execution mode OFDMA system of the present invention, in network side, comprise the unit of the first information from the mapping relations of current logical resource and physical resource to terminal transmission that represent, with the unit that sends data to terminal, in terminal, comprise the unit of the mapping relations that receive this first information and obtain current logical resource and physical resource according to this first information and according to the unit of this mapping relations reception from the data of network side.Because network side will represent that the first information of the mapping relations of current logical resource and physical resource has been transferred to terminal, therefore this terminal can determine to belong to the physical resource of this terminal according to this first information, and then comes automatic network data then from the correct reception of these physical resources.
What deserves to be mentioned is that pattern 2 times, this first information is the dividing condition of little subband, wherein little subband is formed by sub-band division.Send data by little subband to terminal to the unit of terminal transmission data in the network side, the unit of reception data receives the data from network side in the terminal from little subband.When the BRCH channel after a little while, can allow the DRCH channel dispersion in bigger running time-frequency resource for littler little subband sub-band division, when guaranteeing not increase the CQI feedback quantity, obtain bigger diversity gain, and, the little subband of BRCH is little than subband, also can disperse more, system can be the channel resource of BRCH user's assignment the best according to channel condition more neatly like this.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (17)
1. data receive method in the OFDM access system is characterized in that, comprises following steps:
Network side is to the terminal transmission first information, and terminal obtains the mapping relations of current logical resource and physical resource according to the first information, and receives data from described network side according to these mapping relations.
2. data receive method in the OFDM access system according to claim 1 is characterized in that, pattern 2 times, is littler little subband in advance with sub-band division.
3. data receive method in the OFDM access system according to claim 2 is characterized in that, the described first information is one of following:
1 time discrete channel resource DRCH number of pattern;
1 time DRCH distribution condition of pattern;
2 times DRCH subbands of pattern number; Or,
The dividing condition of 2 times DRCH subbands of pattern, little subband.
4. data receive method in the OFDM access system according to claim 3, it is characterized in that, when the described first information was 1 time DRCH number of pattern or 2 times DRCH subbands of pattern number, first information length was according to the maximum decision of maximum DRCH number of current system and maximum DRCH subband number.
5. data receive method in the OFDM access system according to claim 4, it is characterized in that, when the described first information was the dividing condition of 1 time DRCH distribution condition of pattern or 2 times DRCH subbands of pattern, little subband, the length of the first information was the maximum of 1 time maximum DRCH number of pattern and 2 times maximum DRCH subbands of pattern or little subband number;
Pattern 1 time, whether each bit of the described first information represents the DRCH of a correspondence occupied;
Pattern 2 times, on behalf of the subband of a correspondence or little subband, each bit of the described first information belong to DRCH or BRCH.
6. data receive method in the OFDM access system according to claim 5, it is characterized in that, if less than 18 bits, then transmitting in the message blocks of this first information, the length of the described first information also comprises the bit that is used to indicate current resource allocation mode.
7. data receive method in the OFDM access system according to claim 5, it is characterized in that, if the described first information is the dividing condition of 2 times DRCH subbands of pattern, little subband, and the length of this first information is less than 18 bits, then transmits to comprise also in the message blocks of this first information that to be used to indicate DRCH be bit according to subband or little sub-band division.
8. data receive method in the OFDM access system according to claim 1 is characterized in that, the described first information uses a message blocks separately, or share a message blocks with out of Memory.
9. data receive method in the OFDM access system according to claim 1 is characterized in that, described terminal comprises following steps according to the step that described mapping relations receive data:
Described terminal is inquired about described mapping relations according to current shared logical resource, finds the corresponding physical resource, receives the data that belong to this terminal from these physical resources.
10. according to data receive method in each described OFDM access system in the claim 1 to 9, it is characterized in that, described network side by with one of lower channel or its combination in any to the described first information of described terminal transmission;
Forward shared control channel F-SCCH, the forward direction second broadcast channel F-SBCCH or be exclusively used in the resource allocation message channel transmitted.
11. data receive method in the OFDM access system according to claim 10, it is characterized in that, by the F-SBCCH transmission, when the first information changed, the first information after will changing by F-SCCH was again notified described terminal to the described first information earlier.
12., it is characterized in that the described first information transmits by forward traffic channel as the message or the signaling of media interviews control MAC layer according to data receive method in each described OFDM access system in the claim 1 to 9.
13. data receive method in the OFDM access system according to claim 12, it is characterized in that field or an independent MAC layer message in the message that the described first information is configured physical layer parameter as the MAC layer are transmitted by forward traffic channel.
14. an OFDM access system comprises network side and terminal, it is characterized in that, network side also comprises to the unit of the terminal transmission first information and sends the unit of data to terminal;
Terminal also comprises:
Receive the described first information and obtain according to the first information current logical resource and physical resource mapping relations the unit and
According to the unit of this mapping relations reception from the data of described network side.
15. OFDM access system according to claim 14 is characterized in that, pattern 2 times, the described first information is the dividing condition of little subband, and wherein little subband is formed by sub-band division;
Send data by little subband to terminal to the unit of terminal transmission data in the described network side;
The unit that receives data in the described terminal receives from described network data from little subband.
16. an OFDM access system network equipment is characterized in that, comprises:
Can therefrom obtain to terminal transmission current logical resource and physical resource mapping relations the first information the unit and
Send the unit of data to terminal.
17. the terminal based on OFDM is characterized in that, comprises:
Receive the first information and obtain according to the first information current logical resource and physical resource mapping relations the unit and
According to the unit of this mapping relations reception from the data of described network side.
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| WO2009089766A1 (en) * | 2008-01-07 | 2009-07-23 | Huawei Technologies Co., Ltd. | Method for wireless resources allocation and reception, apparatus thereof |
| WO2010075704A1 (en) * | 2009-01-04 | 2010-07-08 | 中兴通讯股份有限公司 | System information transmission method |
| WO2010111974A1 (en) * | 2009-04-03 | 2010-10-07 | 中兴通讯股份有限公司 | Configuration method and apparatus for resource mapping indication information |
| WO2010145409A1 (en) * | 2009-06-16 | 2010-12-23 | 中兴通讯股份有限公司 | Methods for configuring resource mapping indication information |
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| CN107078870A (en) * | 2014-05-02 | 2017-08-18 | 马维尔国际贸易有限公司 | Multi-user's assignment signalling in cordless communication network |
| CN107078870B (en) * | 2014-05-02 | 2021-01-26 | 马维尔国际有限公司 | Multi-user allocation signaling in a wireless communication network |
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